172 files changed, 33962 insertions, 0 deletions

diff --git a/include/os/linux/cde.c b/include/os/linux/cde.c
new file mode 100644
index 0000000..715513c
--- /dev/null
+++ b/include/os/linux/cde.c
@@ -0,0 +1,1794 @@
+/*
+ * Color decompression engine support
+ *
+ * Copyright (c) 2014-2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/fs.h>
+#include <linux/dma-buf.h>
+#include <uapi/linux/nvgpu.h>
+
+#include <trace/events/gk20a.h>
+
+#include <nvgpu/dma.h>
+#include <nvgpu/gmmu.h>
+#include <nvgpu/timers.h>
+#include <nvgpu/nvgpu_common.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/log.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/firmware.h>
+#include <nvgpu/os_sched.h>
+#include <nvgpu/channel.h>
+#include <nvgpu/utils.h>
+#include <nvgpu/gk20a.h>
+
+#include <nvgpu/linux/vm.h>
+
+#include "gk20a/mm_gk20a.h"
+#include "gk20a/fence_gk20a.h"
+#include "gk20a/gr_gk20a.h"
+
+#include "cde.h"
+#include "os_linux.h"
+#include "dmabuf.h"
+#include "channel.h"
+#include "cde_gm20b.h"
+#include "cde_gp10b.h"
+
+#include <nvgpu/hw/gk20a/hw_ccsr_gk20a.h>
+#include <nvgpu/hw/gk20a/hw_pbdma_gk20a.h>
+
+static int gk20a_cde_load(struct gk20a_cde_ctx *cde_ctx);
+static struct gk20a_cde_ctx *gk20a_cde_allocate_context(struct nvgpu_os_linux *l);
+
+#define CTX_DELETE_TIME 1000
+
+#define MAX_CTX_USE_COUNT 42
+#define MAX_CTX_RETRY_TIME 2000
+
+static dma_addr_t gpuva_to_iova_base(struct vm_gk20a *vm, u64 gpu_vaddr)
+{
+        struct nvgpu_mapped_buf *buffer;
+        dma_addr_t addr = 0;
+        struct gk20a *g = gk20a_from_vm(vm);
+
+        nvgpu_mutex_acquire(&vm->update_gmmu_lock);
+        buffer = __nvgpu_vm_find_mapped_buf(vm, gpu_vaddr);
+        if (buffer)
+                addr = nvgpu_mem_get_addr_sgl(g, buffer->os_priv.sgt->sgl);
+        nvgpu_mutex_release(&vm->update_gmmu_lock);
+
+        return addr;
+}
+
+static void gk20a_deinit_cde_img(struct gk20a_cde_ctx *cde_ctx)
+{
+        unsigned int i;
+
+        for (i = 0; i < cde_ctx->num_bufs; i++) {
+                struct nvgpu_mem *mem = cde_ctx->mem + i;
+                nvgpu_dma_unmap_free(cde_ctx->vm, mem);
+        }
+
+        nvgpu_kfree(&cde_ctx->l->g, cde_ctx->init_convert_cmd);
+
+        cde_ctx->convert_cmd = NULL;
+        cde_ctx->init_convert_cmd = NULL;
+        cde_ctx->num_bufs = 0;
+        cde_ctx->num_params = 0;
+        cde_ctx->init_cmd_num_entries = 0;
+        cde_ctx->convert_cmd_num_entries = 0;
+        cde_ctx->init_cmd_executed = false;
+}
+
+static void gk20a_cde_remove_ctx(struct gk20a_cde_ctx *cde_ctx)
+__must_hold(&cde_app->mutex)
+{
+        struct nvgpu_os_linux *l = cde_ctx->l;
+        struct gk20a *g = &l->g;
+        struct channel_gk20a *ch = cde_ctx->ch;
+        struct vm_gk20a *vm = ch->vm;
+
+        trace_gk20a_cde_remove_ctx(cde_ctx);
+
+        /* release mapped memory */
+        gk20a_deinit_cde_img(cde_ctx);
+        nvgpu_gmmu_unmap(vm, &g->gr.compbit_store.mem,
+                         cde_ctx->backing_store_vaddr);
+
+        /*
+         * free the channel
+         * gk20a_channel_close() will also unbind the channel from TSG
+         */
+        gk20a_channel_close(ch);
+        nvgpu_ref_put(&cde_ctx->tsg->refcount, gk20a_tsg_release);
+
+        /* housekeeping on app */
+        nvgpu_list_del(&cde_ctx->list);
+        l->cde_app.ctx_count--;
+        nvgpu_kfree(g, cde_ctx);
+}
+
+static void gk20a_cde_cancel_deleter(struct gk20a_cde_ctx *cde_ctx,
+                bool wait_finish)
+__releases(&cde_app->mutex)
+__acquires(&cde_app->mutex)
+{
+        struct gk20a_cde_app *cde_app = &cde_ctx->l->cde_app;
+
+        /* permanent contexts do not have deleter works */
+        if (!cde_ctx->is_temporary)
+                return;
+
+        if (wait_finish) {
+                nvgpu_mutex_release(&cde_app->mutex);
+                cancel_delayed_work_sync(&cde_ctx->ctx_deleter_work);
+                nvgpu_mutex_acquire(&cde_app->mutex);
+        } else {
+                cancel_delayed_work(&cde_ctx->ctx_deleter_work);
+        }
+}
+
+static void gk20a_cde_remove_contexts(struct nvgpu_os_linux *l)
+__must_hold(&l->cde_app->mutex)
+{
+        struct gk20a_cde_app *cde_app = &l->cde_app;
+        struct gk20a_cde_ctx *cde_ctx, *cde_ctx_save;
+
+        /* safe to go off the mutex in cancel_deleter since app is
+         * deinitialised; no new jobs are started. deleter works may be only at
+         * waiting for the mutex or before, going to abort */
+
+        nvgpu_list_for_each_entry_safe(cde_ctx, cde_ctx_save,
+                        &cde_app->free_contexts, gk20a_cde_ctx, list) {
+                gk20a_cde_cancel_deleter(cde_ctx, true);
+                gk20a_cde_remove_ctx(cde_ctx);
+        }
+
+        nvgpu_list_for_each_entry_safe(cde_ctx, cde_ctx_save,
+                        &cde_app->used_contexts, gk20a_cde_ctx, list) {
+                gk20a_cde_cancel_deleter(cde_ctx, true);
+                gk20a_cde_remove_ctx(cde_ctx);
+        }
+}
+
+static void gk20a_cde_stop(struct nvgpu_os_linux *l)
+__must_hold(&l->cde_app->mutex)
+{
+        struct gk20a_cde_app *cde_app = &l->cde_app;
+
+        /* prevent further conversions and delayed works from working */
+        cde_app->initialised = false;
+        /* free all data, empty the list */
+        gk20a_cde_remove_contexts(l);
+}
+
+void gk20a_cde_destroy(struct nvgpu_os_linux *l)
+__acquires(&l->cde_app->mutex)
+__releases(&l->cde_app->mutex)
+{
+        struct gk20a_cde_app *cde_app = &l->cde_app;
+
+        if (!cde_app->initialised)
+                return;
+
+        nvgpu_mutex_acquire(&cde_app->mutex);
+        gk20a_cde_stop(l);
+        nvgpu_mutex_release(&cde_app->mutex);
+
+        nvgpu_mutex_destroy(&cde_app->mutex);
+}
+
+void gk20a_cde_suspend(struct nvgpu_os_linux *l)
+__acquires(&l->cde_app->mutex)
+__releases(&l->cde_app->mutex)
+{
+        struct gk20a_cde_app *cde_app = &l->cde_app;
+        struct gk20a_cde_ctx *cde_ctx, *cde_ctx_save;
+
+        if (!cde_app->initialised)
+                return;
+
+        nvgpu_mutex_acquire(&cde_app->mutex);
+
+        nvgpu_list_for_each_entry_safe(cde_ctx, cde_ctx_save,
+                        &cde_app->free_contexts, gk20a_cde_ctx, list) {
+                gk20a_cde_cancel_deleter(cde_ctx, false);
+        }
+
+        nvgpu_list_for_each_entry_safe(cde_ctx, cde_ctx_save,
+                        &cde_app->used_contexts, gk20a_cde_ctx, list) {
+                gk20a_cde_cancel_deleter(cde_ctx, false);
+        }
+
+        nvgpu_mutex_release(&cde_app->mutex);
+
+}
+
+static int gk20a_cde_create_context(struct nvgpu_os_linux *l)
+__must_hold(&l->cde_app->mutex)
+{
+        struct gk20a_cde_app *cde_app = &l->cde_app;
+        struct gk20a_cde_ctx *cde_ctx;
+
+        cde_ctx = gk20a_cde_allocate_context(l);
+        if (IS_ERR(cde_ctx))
+                return PTR_ERR(cde_ctx);
+
+        nvgpu_list_add(&cde_ctx->list, &cde_app->free_contexts);
+        cde_app->ctx_count++;
+        if (cde_app->ctx_count > cde_app->ctx_count_top)
+                cde_app->ctx_count_top = cde_app->ctx_count;
+
+        return 0;
+}
+
+static int gk20a_cde_create_contexts(struct nvgpu_os_linux *l)
+__must_hold(&l->cde_app->mutex)
+{
+        int err;
+        int i;
+
+        for (i = 0; i < NUM_CDE_CONTEXTS; i++) {
+                err = gk20a_cde_create_context(l);
+                if (err)
+                        goto out;
+        }
+
+        return 0;
+out:
+        gk20a_cde_remove_contexts(l);
+        return err;
+}
+
+static int gk20a_init_cde_buf(struct gk20a_cde_ctx *cde_ctx,
+                              struct nvgpu_firmware *img,
+                              struct gk20a_cde_hdr_buf *buf)
+{
+        struct nvgpu_mem *mem;
+        struct nvgpu_os_linux *l = cde_ctx->l;
+        struct gk20a *g = &l->g;
+        int err;
+
+        /* check that the file can hold the buf */
+        if (buf->data_byte_offset != 0 &&
+            buf->data_byte_offset + buf->num_bytes > img->size) {
+                nvgpu_warn(g, "cde: invalid data section. buffer idx = %d",
+                           cde_ctx->num_bufs);
+                return -EINVAL;
+        }
+
+        /* check that we have enough buf elems available */
+        if (cde_ctx->num_bufs >= MAX_CDE_BUFS) {
+                nvgpu_warn(g, "cde: invalid data section. buffer idx = %d",
+                           cde_ctx->num_bufs);
+                return -ENOMEM;
+        }
+
+        /* allocate buf */
+        mem = cde_ctx->mem + cde_ctx->num_bufs;
+        err = nvgpu_dma_alloc_map_sys(cde_ctx->vm, buf->num_bytes, mem);
+        if (err) {
+                nvgpu_warn(g, "cde: could not allocate device memory. buffer idx = %d",
+                           cde_ctx->num_bufs);
+                return -ENOMEM;
+        }
+
+        /* copy the content */
+        if (buf->data_byte_offset != 0)
+                memcpy(mem->cpu_va, img->data + buf->data_byte_offset,
+                       buf->num_bytes);
+
+        cde_ctx->num_bufs++;
+
+        return 0;
+}
+
+static int gk20a_replace_data(struct gk20a_cde_ctx *cde_ctx, void *target,
+                              int type, s32 shift, u64 mask, u64 value)
+{
+        struct nvgpu_os_linux *l = cde_ctx->l;
+        struct gk20a *g = &l->g;
+        u32 *target_mem_ptr = target;
+        u64 *target_mem_ptr_u64 = target;
+        u64 current_value, new_value;
+
+        value = (shift >= 0) ? value << shift : value >> -shift;
+        value &= mask;
+
+        /* read current data from the location */
+        current_value = 0;
+        if (type == TYPE_PARAM_TYPE_U32) {
+                if (mask != 0xfffffffful)
+                        current_value = *target_mem_ptr;
+        } else if (type == TYPE_PARAM_TYPE_U64_LITTLE) {
+                if (mask != ~0ul)
+                        current_value = *target_mem_ptr_u64;
+        } else if (type == TYPE_PARAM_TYPE_U64_BIG) {
+                current_value = *target_mem_ptr_u64;
+                current_value = (u64)(current_value >> 32) |
+                        (u64)(current_value << 32);
+        } else {
+                nvgpu_warn(g, "cde: unknown type. type=%d",
+                           type);
+                return -EINVAL;
+        }
+
+        current_value &= ~mask;
+        new_value = current_value | value;
+
+        /* store the element data back */
+        if (type == TYPE_PARAM_TYPE_U32)
+                *target_mem_ptr = (u32)new_value;
+        else if (type == TYPE_PARAM_TYPE_U64_LITTLE)
+                *target_mem_ptr_u64 = new_value;
+        else  {
+                new_value = (u64)(new_value >> 32) |
+                        (u64)(new_value << 32);
+                *target_mem_ptr_u64 = new_value;
+        }
+
+        return 0;
+}
+
+static int gk20a_init_cde_replace(struct gk20a_cde_ctx *cde_ctx,
+                                  struct nvgpu_firmware *img,
+                                  struct gk20a_cde_hdr_replace *replace)
+{
+        struct nvgpu_mem *source_mem;
+        struct nvgpu_mem *target_mem;
+        struct nvgpu_os_linux *l = cde_ctx->l;
+        struct gk20a *g = &l->g;
+        u32 *target_mem_ptr;
+        u64 vaddr;
+        int err;
+
+        if (replace->target_buf >= cde_ctx->num_bufs ||
+            replace->source_buf >= cde_ctx->num_bufs) {
+                nvgpu_warn(g, "cde: invalid buffer. target_buf=%u, source_buf=%u, num_bufs=%d",
+                           replace->target_buf, replace->source_buf,
+                           cde_ctx->num_bufs);
+                return -EINVAL;
+        }
+
+        source_mem = cde_ctx->mem + replace->source_buf;
+        target_mem = cde_ctx->mem + replace->target_buf;
+        target_mem_ptr = target_mem->cpu_va;
+
+        if (source_mem->size < (replace->source_byte_offset + 3) ||
+            target_mem->size < (replace->target_byte_offset + 3)) {
+                nvgpu_warn(g, "cde: invalid buffer offsets. target_buf_offs=%lld, source_buf_offs=%lld, source_buf_size=%zu, dest_buf_size=%zu",
+                           replace->target_byte_offset,
+                           replace->source_byte_offset,
+                         source_mem->size,
+                         target_mem->size);
+                return -EINVAL;
+        }
+
+        /* calculate the target pointer */
+        target_mem_ptr += (replace->target_byte_offset / sizeof(u32));
+
+        /* determine patch value */
+        vaddr = source_mem->gpu_va + replace->source_byte_offset;
+        err = gk20a_replace_data(cde_ctx, target_mem_ptr, replace->type,
+                                 replace->shift, replace->mask,
+                                 vaddr);
+        if (err) {
+                nvgpu_warn(g, "cde: replace failed. err=%d, target_buf=%u, target_buf_offs=%lld, source_buf=%u, source_buf_offs=%lld",
+                           err, replace->target_buf,
+                           replace->target_byte_offset,
+                           replace->source_buf,
+                           replace->source_byte_offset);
+        }
+
+        return err;
+}
+
+static int gk20a_cde_patch_params(struct gk20a_cde_ctx *cde_ctx)
+{
+        struct nvgpu_os_linux *l = cde_ctx->l;
+        struct gk20a *g = &l->g;
+        struct nvgpu_mem *target_mem;
+        u32 *target_mem_ptr;
+        u64 new_data;
+        int user_id = 0, err;
+        unsigned int i;
+
+        for (i = 0; i < cde_ctx->num_params; i++) {
+                struct gk20a_cde_hdr_param *param = cde_ctx->params + i;
+                target_mem = cde_ctx->mem + param->target_buf;
+                target_mem_ptr = target_mem->cpu_va;
+                target_mem_ptr += (param->target_byte_offset / sizeof(u32));
+
+                switch (param->id) {
+                case TYPE_PARAM_COMPTAGS_PER_CACHELINE:
+                        new_data = g->gr.comptags_per_cacheline;
+                        break;
+                case TYPE_PARAM_GPU_CONFIGURATION:
+                        new_data = (u64)g->ltc_count * g->gr.slices_per_ltc *
+                                g->gr.cacheline_size;
+                        break;
+                case TYPE_PARAM_FIRSTPAGEOFFSET:
+                        new_data = cde_ctx->surf_param_offset;
+                        break;
+                case TYPE_PARAM_NUMPAGES:
+                        new_data = cde_ctx->surf_param_lines;
+                        break;
+                case TYPE_PARAM_BACKINGSTORE:
+                        new_data = cde_ctx->backing_store_vaddr;
+                        break;
+                case TYPE_PARAM_DESTINATION:
+                        new_data = cde_ctx->compbit_vaddr;
+                        break;
+                case TYPE_PARAM_DESTINATION_SIZE:
+                        new_data = cde_ctx->compbit_size;
+                        break;
+                case TYPE_PARAM_BACKINGSTORE_SIZE:
+                        new_data = g->gr.compbit_store.mem.size;
+                        break;
+                case TYPE_PARAM_SOURCE_SMMU_ADDR:
+                        new_data = gpuva_to_iova_base(cde_ctx->vm,
+                                                      cde_ctx->surf_vaddr);
+                        if (new_data == 0) {
+                                nvgpu_warn(g, "cde: failed to find 0x%llx",
+                                                cde_ctx->surf_vaddr);
+                                return -EINVAL;
+                        }
+                        break;
+                case TYPE_PARAM_BACKINGSTORE_BASE_HW:
+                        new_data = g->gr.compbit_store.base_hw;
+                        break;
+                case TYPE_PARAM_GOBS_PER_COMPTAGLINE_PER_SLICE:
+                        new_data = g->gr.gobs_per_comptagline_per_slice;
+                        break;
+                case TYPE_PARAM_SCATTERBUFFER:
+                        new_data = cde_ctx->scatterbuffer_vaddr;
+                        break;
+                case TYPE_PARAM_SCATTERBUFFER_SIZE:
+                        new_data = cde_ctx->scatterbuffer_size;
+                        break;
+                default:
+                        user_id = param->id - NUM_RESERVED_PARAMS;
+                        if (user_id < 0 || user_id >= MAX_CDE_USER_PARAMS)
+                                continue;
+                        new_data = cde_ctx->user_param_values[user_id];
+                }
+
+                nvgpu_log(g, gpu_dbg_cde, "cde: patch: idx_in_file=%d   param_id=%d     target_buf=%u   target_byte_offset=%lld data_value=0x%llx       data_offset/data_diff=%lld      data_type=%d    data_shift=%d   data_mask=0x%llx",
+                          i, param->id, param->target_buf,
+                          param->target_byte_offset, new_data,
+                          param->data_offset, param->type, param->shift,
+                          param->mask);
+
+                new_data += param->data_offset;
+
+                err = gk20a_replace_data(cde_ctx, target_mem_ptr, param->type,
+                                         param->shift, param->mask, new_data);
+
+                if (err) {
+                        nvgpu_warn(g, "cde: patch failed. err=%d, idx=%d, id=%d, target_buf=%u, target_buf_offs=%lld, patch_value=%llu",
+                                   err, i, param->id, param->target_buf,
+                                   param->target_byte_offset, new_data);
+                        return err;
+                }
+        }
+
+        return 0;
+}
+
+static int gk20a_init_cde_param(struct gk20a_cde_ctx *cde_ctx,
+                                struct nvgpu_firmware *img,
+                                struct gk20a_cde_hdr_param *param)
+{
+        struct nvgpu_mem *target_mem;
+        struct nvgpu_os_linux *l = cde_ctx->l;
+        struct gk20a *g = &l->g;
+
+        if (param->target_buf >= cde_ctx->num_bufs) {
+                nvgpu_warn(g, "cde: invalid buffer parameter. param idx = %d, target_buf=%u, num_bufs=%u",
+                           cde_ctx->num_params, param->target_buf,
+                           cde_ctx->num_bufs);
+                return -EINVAL;
+        }
+
+        target_mem = cde_ctx->mem + param->target_buf;
+        if (target_mem->size < (param->target_byte_offset + 3)) {
+                nvgpu_warn(g, "cde: invalid buffer parameter. param idx = %d, target_buf_offs=%lld, target_buf_size=%zu",
+                           cde_ctx->num_params, param->target_byte_offset,
+                           target_mem->size);
+                return -EINVAL;
+        }
+
+        /* does this parameter fit into our parameter structure */
+        if (cde_ctx->num_params >= MAX_CDE_PARAMS) {
+                nvgpu_warn(g, "cde: no room for new parameters param idx = %d",
+                           cde_ctx->num_params);
+                return -ENOMEM;
+        }
+
+        /* is the given id valid? */
+        if (param->id >= NUM_RESERVED_PARAMS + MAX_CDE_USER_PARAMS) {
+                nvgpu_warn(g, "cde: parameter id is not valid. param idx = %d, id=%u, max=%u",
+                           param->id, cde_ctx->num_params,
+                           NUM_RESERVED_PARAMS + MAX_CDE_USER_PARAMS);
+                return -EINVAL;
+        }
+
+        cde_ctx->params[cde_ctx->num_params] = *param;
+        cde_ctx->num_params++;
+
+        return 0;
+}
+
+static int gk20a_init_cde_required_class(struct gk20a_cde_ctx *cde_ctx,
+                                         struct nvgpu_firmware *img,
+                                         u32 required_class)
+{
+        struct nvgpu_os_linux *l = cde_ctx->l;
+        struct gk20a *g = &l->g;
+        int err;
+
+        /* CDE enabled */
+        cde_ctx->ch->cde = true;
+
+        err = gk20a_alloc_obj_ctx(cde_ctx->ch, required_class, 0);
+        if (err) {
+                nvgpu_warn(g, "cde: failed to allocate ctx. err=%d",
+                           err);
+                return err;
+        }
+
+        return 0;
+}
+
+static int gk20a_init_cde_command(struct gk20a_cde_ctx *cde_ctx,
+                                  struct nvgpu_firmware *img,
+                                  u32 op,
+                                  struct gk20a_cde_cmd_elem *cmd_elem,
+                                  u32 num_elems)
+{
+        struct nvgpu_os_linux *l = cde_ctx->l;
+        struct gk20a *g = &l->g;
+        struct nvgpu_gpfifo_entry **gpfifo, *gpfifo_elem;
+        u32 *num_entries;
+        unsigned int i;
+
+        /* check command type */
+        if (op == TYPE_BUF_COMMAND_INIT) {
+                gpfifo = &cde_ctx->init_convert_cmd;
+                num_entries = &cde_ctx->init_cmd_num_entries;
+        } else if (op == TYPE_BUF_COMMAND_CONVERT) {
+                gpfifo = &cde_ctx->convert_cmd;
+                num_entries = &cde_ctx->convert_cmd_num_entries;
+        } else {
+                nvgpu_warn(g, "cde: unknown command. op=%u",
+                           op);
+                return -EINVAL;
+        }
+
+        /* allocate gpfifo entries to be pushed */
+        *gpfifo = nvgpu_kzalloc(g,
+                                sizeof(struct nvgpu_gpfifo_entry) * num_elems);
+        if (!*gpfifo) {
+                nvgpu_warn(g, "cde: could not allocate memory for gpfifo entries");
+                return -ENOMEM;
+        }
+
+        gpfifo_elem = *gpfifo;
+        for (i = 0; i < num_elems; i++, cmd_elem++, gpfifo_elem++) {
+                struct nvgpu_mem *target_mem;
+
+                /* validate the current entry */
+                if (cmd_elem->target_buf >= cde_ctx->num_bufs) {
+                        nvgpu_warn(g, "cde: target buffer is not available (target=%u, num_bufs=%u)",
+                                   cmd_elem->target_buf, cde_ctx->num_bufs);
+                        return -EINVAL;
+                }
+
+                target_mem = cde_ctx->mem + cmd_elem->target_buf;
+                if (target_mem->size<
+                    cmd_elem->target_byte_offset + cmd_elem->num_bytes) {
+                        nvgpu_warn(g, "cde: target buffer cannot hold all entries (target_size=%zu, target_byte_offset=%lld, num_bytes=%llu)",
+                                   target_mem->size,
+                                   cmd_elem->target_byte_offset,
+                                   cmd_elem->num_bytes);
+                        return -EINVAL;
+                }
+
+                /* store the element into gpfifo */
+                gpfifo_elem->entry0 =
+                        u64_lo32(target_mem->gpu_va +
+                        cmd_elem->target_byte_offset);
+                gpfifo_elem->entry1 =
+                        u64_hi32(target_mem->gpu_va +
+                        cmd_elem->target_byte_offset) |
+                        pbdma_gp_entry1_length_f(cmd_elem->num_bytes /
+                                                 sizeof(u32));
+        }
+
+        *num_entries = num_elems;
+        return 0;
+}
+
+static int gk20a_cde_pack_cmdbufs(struct gk20a_cde_ctx *cde_ctx)
+{
+        struct nvgpu_os_linux *l = cde_ctx->l;
+        struct gk20a *g = &l->g;
+        unsigned long init_bytes = cde_ctx->init_cmd_num_entries *
+                sizeof(struct nvgpu_gpfifo_entry);
+        unsigned long conv_bytes = cde_ctx->convert_cmd_num_entries *
+                sizeof(struct nvgpu_gpfifo_entry);
+        unsigned long total_bytes = init_bytes + conv_bytes;
+        struct nvgpu_gpfifo_entry *combined_cmd;
+
+        /* allocate buffer that has space for both */
+        combined_cmd = nvgpu_kzalloc(g, total_bytes);
+        if (!combined_cmd) {
+                nvgpu_warn(g,
+                        "cde: could not allocate memory for gpfifo entries");
+                return -ENOMEM;
+        }
+
+        /* move the original init here and append convert */
+        memcpy(combined_cmd, cde_ctx->init_convert_cmd, init_bytes);
+        memcpy(combined_cmd + cde_ctx->init_cmd_num_entries,
+                        cde_ctx->convert_cmd, conv_bytes);
+
+        nvgpu_kfree(g, cde_ctx->init_convert_cmd);
+        nvgpu_kfree(g, cde_ctx->convert_cmd);
+
+        cde_ctx->init_convert_cmd = combined_cmd;
+        cde_ctx->convert_cmd = combined_cmd
+                + cde_ctx->init_cmd_num_entries;
+
+        return 0;
+}
+
+static int gk20a_init_cde_img(struct gk20a_cde_ctx *cde_ctx,
+                              struct nvgpu_firmware *img)
+{
+        struct nvgpu_os_linux *l = cde_ctx->l;
+        struct gk20a *g = &l->g;
+        struct gk20a_cde_app *cde_app = &l->cde_app;
+        u32 *data = (u32 *)img->data;
+        u32 num_of_elems;
+        struct gk20a_cde_hdr_elem *elem;
+        u32 min_size = 0;
+        int err = 0;
+        unsigned int i;
+
+        min_size += 2 * sizeof(u32);
+        if (img->size < min_size) {
+                nvgpu_warn(g, "cde: invalid image header");
+                return -EINVAL;
+        }
+
+        cde_app->firmware_version = data[0];
+        num_of_elems = data[1];
+
+        min_size += num_of_elems * sizeof(*elem);
+        if (img->size < min_size) {
+                nvgpu_warn(g, "cde: bad image");
+                return -EINVAL;
+        }
+
+        elem = (struct gk20a_cde_hdr_elem *)&data[2];
+        for (i = 0; i < num_of_elems; i++) {
+                int err = 0;
+                switch (elem->type) {
+                case TYPE_BUF:
+                        err = gk20a_init_cde_buf(cde_ctx, img, &elem->buf);
+                        break;
+                case TYPE_REPLACE:
+                        err = gk20a_init_cde_replace(cde_ctx, img,
+                                                     &elem->replace);
+                        break;
+                case TYPE_PARAM:
+                        err = gk20a_init_cde_param(cde_ctx, img, &elem->param);
+                        break;
+                case TYPE_REQUIRED_CLASS:
+                        err = gk20a_init_cde_required_class(cde_ctx, img,
+                                elem->required_class);
+                        break;
+                case TYPE_COMMAND:
+                {
+                        struct gk20a_cde_cmd_elem *cmd = (void *)
+                                &img->data[elem->command.data_byte_offset];
+                        err = gk20a_init_cde_command(cde_ctx, img,
+                                elem->command.op, cmd,
+                                elem->command.num_entries);
+                        break;
+                }
+                case TYPE_ARRAY:
+                        memcpy(&cde_app->arrays[elem->array.id][0],
+                                elem->array.data,
+                                MAX_CDE_ARRAY_ENTRIES*sizeof(u32));
+                        break;
+                default:
+                        nvgpu_warn(g, "cde: unknown header element");
+                        err = -EINVAL;
+                }
+
+                if (err)
+                        goto deinit_image;
+
+                elem++;
+        }
+
+        if (!cde_ctx->init_convert_cmd || !cde_ctx->init_cmd_num_entries) {
+                nvgpu_warn(g, "cde: convert command not defined");
+                err = -EINVAL;
+                goto deinit_image;
+        }
+
+        if (!cde_ctx->convert_cmd || !cde_ctx->convert_cmd_num_entries) {
+                nvgpu_warn(g, "cde: convert command not defined");
+                err = -EINVAL;
+                goto deinit_image;
+        }
+
+        err = gk20a_cde_pack_cmdbufs(cde_ctx);
+        if (err)
+                goto deinit_image;
+
+        return 0;
+
+deinit_image:
+        gk20a_deinit_cde_img(cde_ctx);
+        return err;
+}
+
+static int gk20a_cde_execute_buffer(struct gk20a_cde_ctx *cde_ctx,
+                                    u32 op, struct nvgpu_channel_fence *fence,
+                                    u32 flags, struct gk20a_fence **fence_out)
+{
+        struct nvgpu_os_linux *l = cde_ctx->l;
+        struct gk20a *g = &l->g;
+        struct nvgpu_gpfifo_entry *gpfifo = NULL;
+        int num_entries = 0;
+
+        /* check command type */
+        if (op == TYPE_BUF_COMMAND_INIT) {
+                /* both init and convert combined */
+                gpfifo = cde_ctx->init_convert_cmd;
+                num_entries = cde_ctx->init_cmd_num_entries
+                        + cde_ctx->convert_cmd_num_entries;
+        } else if (op == TYPE_BUF_COMMAND_CONVERT) {
+                gpfifo = cde_ctx->convert_cmd;
+                num_entries = cde_ctx->convert_cmd_num_entries;
+        } else if (op == TYPE_BUF_COMMAND_NOOP) {
+                /* Any non-null gpfifo will suffice with 0 num_entries */
+                gpfifo = cde_ctx->init_convert_cmd;
+                num_entries = 0;
+        } else {
+                nvgpu_warn(g, "cde: unknown buffer");
+                return -EINVAL;
+        }
+
+        if (gpfifo == NULL) {
+                nvgpu_warn(g, "cde: buffer not available");
+                return -ENOSYS;
+        }
+
+        return nvgpu_submit_channel_gpfifo_kernel(cde_ctx->ch, gpfifo,
+                        num_entries, flags, fence, fence_out);
+}
+
+static void gk20a_cde_ctx_release(struct gk20a_cde_ctx *cde_ctx)
+__acquires(&cde_app->mutex)
+__releases(&cde_app->mutex)
+{
+        struct gk20a_cde_app *cde_app = &cde_ctx->l->cde_app;
+        struct gk20a *g = &cde_ctx->l->g;
+
+        nvgpu_log(g, gpu_dbg_cde_ctx, "releasing use on %p", cde_ctx);
+        trace_gk20a_cde_release(cde_ctx);
+
+        nvgpu_mutex_acquire(&cde_app->mutex);
+
+        if (cde_ctx->in_use) {
+                cde_ctx->in_use = false;
+                nvgpu_list_move(&cde_ctx->list, &cde_app->free_contexts);
+                cde_app->ctx_usecount--;
+        } else {
+                nvgpu_log_info(g, "double release cde context %p", cde_ctx);
+        }
+
+        nvgpu_mutex_release(&cde_app->mutex);
+}
+
+static void gk20a_cde_ctx_deleter_fn(struct work_struct *work)
+__acquires(&cde_app->mutex)
+__releases(&cde_app->mutex)
+{
+        struct delayed_work *delay_work = to_delayed_work(work);
+        struct gk20a_cde_ctx *cde_ctx = container_of(delay_work,
+                        struct gk20a_cde_ctx, ctx_deleter_work);
+        struct gk20a_cde_app *cde_app = &cde_ctx->l->cde_app;
+        struct nvgpu_os_linux *l = cde_ctx->l;
+        struct gk20a *g = &l->g;
+        int err;
+
+        /* someone has just taken it? engine deletion started? */
+        if (cde_ctx->in_use || !cde_app->initialised)
+                return;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_cde_ctx,
+                        "cde: attempting to delete temporary %p", cde_ctx);
+
+        err = gk20a_busy(g);
+        if (err) {
+                /* this context would find new use anyway later, so not freeing
+                 * here does not leak anything */
+                nvgpu_warn(g, "cde: cannot set gk20a on, postponing"
+                                " temp ctx deletion");
+                return;
+        }
+
+        nvgpu_mutex_acquire(&cde_app->mutex);
+        if (cde_ctx->in_use || !cde_app->initialised) {
+                nvgpu_log(g, gpu_dbg_cde_ctx,
+                                "cde: context use raced, not deleting %p",
+                                cde_ctx);
+                goto out;
+        }
+
+        WARN(delayed_work_pending(&cde_ctx->ctx_deleter_work),
+                        "double pending %p", cde_ctx);
+
+        gk20a_cde_remove_ctx(cde_ctx);
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_cde_ctx,
+                        "cde: destroyed %p count=%d use=%d max=%d",
+                        cde_ctx, cde_app->ctx_count, cde_app->ctx_usecount,
+                        cde_app->ctx_count_top);
+
+out:
+        nvgpu_mutex_release(&cde_app->mutex);
+        gk20a_idle(g);
+}
+
+static struct gk20a_cde_ctx *gk20a_cde_do_get_context(struct nvgpu_os_linux *l)
+__must_hold(&cde_app->mutex)
+{
+        struct gk20a *g = &l->g;
+        struct gk20a_cde_app *cde_app = &l->cde_app;
+        struct gk20a_cde_ctx *cde_ctx;
+
+        /* exhausted? */
+
+        if (cde_app->ctx_usecount >= MAX_CTX_USE_COUNT)
+                return ERR_PTR(-EAGAIN);
+
+        /* idle context available? */
+
+        if (!nvgpu_list_empty(&cde_app->free_contexts)) {
+                cde_ctx = nvgpu_list_first_entry(&cde_app->free_contexts,
+                                gk20a_cde_ctx, list);
+                nvgpu_log(g, gpu_dbg_fn | gpu_dbg_cde_ctx,
+                                "cde: got free %p count=%d use=%d max=%d",
+                                cde_ctx, cde_app->ctx_count,
+                                cde_app->ctx_usecount,
+                                cde_app->ctx_count_top);
+                trace_gk20a_cde_get_context(cde_ctx);
+
+                /* deleter work may be scheduled, but in_use prevents it */
+                cde_ctx->in_use = true;
+                nvgpu_list_move(&cde_ctx->list, &cde_app->used_contexts);
+                cde_app->ctx_usecount++;
+
+                /* cancel any deletions now that ctx is in use */
+                gk20a_cde_cancel_deleter(cde_ctx, true);
+                return cde_ctx;
+        }
+
+        /* no free contexts, get a temporary one */
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_cde_ctx,
+                        "cde: no free contexts, count=%d",
+                        cde_app->ctx_count);
+
+        cde_ctx = gk20a_cde_allocate_context(l);
+        if (IS_ERR(cde_ctx)) {
+                nvgpu_warn(g, "cde: cannot allocate context: %ld",
+                                PTR_ERR(cde_ctx));
+                return cde_ctx;
+        }
+
+        trace_gk20a_cde_get_context(cde_ctx);
+        cde_ctx->in_use = true;
+        cde_ctx->is_temporary = true;
+        cde_app->ctx_usecount++;
+        cde_app->ctx_count++;
+        if (cde_app->ctx_count > cde_app->ctx_count_top)
+                cde_app->ctx_count_top = cde_app->ctx_count;
+        nvgpu_list_add(&cde_ctx->list, &cde_app->used_contexts);
+
+        return cde_ctx;
+}
+
+static struct gk20a_cde_ctx *gk20a_cde_get_context(struct nvgpu_os_linux *l)
+__releases(&cde_app->mutex)
+__acquires(&cde_app->mutex)
+{
+        struct gk20a *g = &l->g;
+        struct gk20a_cde_app *cde_app = &l->cde_app;
+        struct gk20a_cde_ctx *cde_ctx = NULL;
+        struct nvgpu_timeout timeout;
+
+        nvgpu_timeout_init(g, &timeout, MAX_CTX_RETRY_TIME,
+                           NVGPU_TIMER_CPU_TIMER);
+
+        do {
+                cde_ctx = gk20a_cde_do_get_context(l);
+                if (PTR_ERR(cde_ctx) != -EAGAIN)
+                        break;
+
+                /* exhausted, retry */
+                nvgpu_mutex_release(&cde_app->mutex);
+                cond_resched();
+                nvgpu_mutex_acquire(&cde_app->mutex);
+        } while (!nvgpu_timeout_expired(&timeout));
+
+        return cde_ctx;
+}
+
+static struct gk20a_cde_ctx *gk20a_cde_allocate_context(struct nvgpu_os_linux *l)
+{
+        struct gk20a *g = &l->g;
+        struct gk20a_cde_ctx *cde_ctx;
+        int ret;
+
+        cde_ctx = nvgpu_kzalloc(g, sizeof(*cde_ctx));
+        if (!cde_ctx)
+                return ERR_PTR(-ENOMEM);
+
+        cde_ctx->l = l;
+        cde_ctx->dev = dev_from_gk20a(g);
+
+        ret = gk20a_cde_load(cde_ctx);
+        if (ret) {
+                nvgpu_kfree(g, cde_ctx);
+                return ERR_PTR(ret);
+        }
+
+        nvgpu_init_list_node(&cde_ctx->list);
+        cde_ctx->is_temporary = false;
+        cde_ctx->in_use = false;
+        INIT_DELAYED_WORK(&cde_ctx->ctx_deleter_work,
+                        gk20a_cde_ctx_deleter_fn);
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_cde_ctx, "cde: allocated %p", cde_ctx);
+        trace_gk20a_cde_allocate_context(cde_ctx);
+        return cde_ctx;
+}
+
+static u32 gk20a_cde_mapping_page_size(struct vm_gk20a *vm,
+                                       u32 map_offset, u32 map_size)
+{
+        struct gk20a *g = gk20a_from_vm(vm);
+
+        /*
+         * To be simple we will just make the map size depend on the
+         * iommu'ability of the driver. If there's an IOMMU we can rely on
+         * buffers being contiguous. If not, then we'll use 4k pages since we
+         * know that will work for any buffer.
+         */
+        if (!nvgpu_iommuable(g))
+                return SZ_4K;
+
+        /*
+         * If map size or offset is not 64K aligned then use small pages.
+         */
+        if (map_size & (vm->big_page_size - 1) ||
+            map_offset & (vm->big_page_size - 1))
+                return SZ_4K;
+
+        return vm->big_page_size;
+}
+
+int gk20a_cde_convert(struct nvgpu_os_linux *l,
+                      struct dma_buf *compbits_scatter_buf,
+                      u64 compbits_byte_offset,
+                      u64 scatterbuffer_byte_offset,
+                      struct nvgpu_channel_fence *fence,
+                      u32 __flags, struct gk20a_cde_param *params,
+                      int num_params, struct gk20a_fence **fence_out)
+__acquires(&l->cde_app->mutex)
+__releases(&l->cde_app->mutex)
+{
+        struct gk20a *g = &l->g;
+        struct gk20a_cde_ctx *cde_ctx = NULL;
+        struct gk20a_comptags comptags;
+        struct nvgpu_os_buffer os_buf = {
+                compbits_scatter_buf,
+                NULL,
+                dev_from_gk20a(g)
+        };
+        u64 mapped_compbits_offset = 0;
+        u64 compbits_size = 0;
+        u64 mapped_scatterbuffer_offset = 0;
+        u64 scatterbuffer_size = 0;
+        u64 map_vaddr = 0;
+        u64 map_offset = 0;
+        u64 map_size = 0;
+        u8 *surface = NULL;
+        u64 big_page_mask = 0;
+        u32 flags;
+        int err, i;
+        const s16 compbits_kind = 0;
+        u32 submit_op;
+        struct dma_buf_attachment *attachment;
+
+        nvgpu_log(g, gpu_dbg_cde, "compbits_byte_offset=%llu scatterbuffer_byte_offset=%llu",
+                  compbits_byte_offset, scatterbuffer_byte_offset);
+
+        /* scatter buffer must be after compbits buffer */
+        if (scatterbuffer_byte_offset &&
+            scatterbuffer_byte_offset < compbits_byte_offset)
+                return -EINVAL;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        nvgpu_mutex_acquire(&l->cde_app.mutex);
+        cde_ctx = gk20a_cde_get_context(l);
+        nvgpu_mutex_release(&l->cde_app.mutex);
+        if (IS_ERR(cde_ctx)) {
+                err = PTR_ERR(cde_ctx);
+                goto exit_idle;
+        }
+
+        /* First, map the buffer to local va */
+
+        /* ensure that the compbits buffer has drvdata */
+        err = gk20a_dmabuf_alloc_drvdata(compbits_scatter_buf,
+                        dev_from_gk20a(g));
+        if (err)
+                goto exit_idle;
+
+        /* compbits don't start at page aligned offset, so we need to align
+           the region to be mapped */
+        big_page_mask = cde_ctx->vm->big_page_size - 1;
+        map_offset = compbits_byte_offset & ~big_page_mask;
+        map_size = compbits_scatter_buf->size - map_offset;
+
+
+        /* compute compbit start offset from the beginning of the mapped
+           area */
+        mapped_compbits_offset = compbits_byte_offset - map_offset;
+        if (scatterbuffer_byte_offset) {
+                compbits_size = scatterbuffer_byte_offset -
+                                compbits_byte_offset;
+                mapped_scatterbuffer_offset = scatterbuffer_byte_offset -
+                                              map_offset;
+                scatterbuffer_size = compbits_scatter_buf->size -
+                                     scatterbuffer_byte_offset;
+        } else {
+                compbits_size = compbits_scatter_buf->size -
+                                compbits_byte_offset;
+        }
+
+        nvgpu_log(g, gpu_dbg_cde, "map_offset=%llu map_size=%llu",
+                  map_offset, map_size);
+        nvgpu_log(g, gpu_dbg_cde, "mapped_compbits_offset=%llu compbits_size=%llu",
+                  mapped_compbits_offset, compbits_size);
+        nvgpu_log(g, gpu_dbg_cde, "mapped_scatterbuffer_offset=%llu scatterbuffer_size=%llu",
+                  mapped_scatterbuffer_offset, scatterbuffer_size);
+
+
+        /* map the destination buffer */
+        get_dma_buf(compbits_scatter_buf); /* a ref for nvgpu_vm_map_linux */
+        err = nvgpu_vm_map_linux(cde_ctx->vm, compbits_scatter_buf, 0,
+                                 NVGPU_VM_MAP_CACHEABLE |
+                                 NVGPU_VM_MAP_DIRECT_KIND_CTRL,
+                                 gk20a_cde_mapping_page_size(cde_ctx->vm,
+                                                             map_offset,
+                                                             map_size),
+                                 NV_KIND_INVALID,
+                                 compbits_kind, /* incompressible kind */
+                                 gk20a_mem_flag_none,
+                                 map_offset, map_size,
+                                 NULL,
+                                 &map_vaddr);
+        if (err) {
+                nvgpu_warn(g, "cde: failed to map compbits scatter buf at %lld size %lld",
+                                map_offset, map_size);
+                dma_buf_put(compbits_scatter_buf);
+                err = -EINVAL;
+                goto exit_idle;
+        }
+
+        if (scatterbuffer_byte_offset &&
+            l->ops.cde.need_scatter_buffer &&
+            l->ops.cde.need_scatter_buffer(g)) {
+                struct sg_table *sgt;
+                void *scatter_buffer;
+
+                surface = dma_buf_vmap(compbits_scatter_buf);
+                if (IS_ERR(surface)) {
+                        nvgpu_warn(g,
+                                   "dma_buf_vmap failed");
+                        err = -EINVAL;
+                        goto exit_unmap_vaddr;
+                }
+
+                scatter_buffer = surface + scatterbuffer_byte_offset;
+
+                nvgpu_log(g, gpu_dbg_cde, "surface=0x%p scatterBuffer=0x%p",
+                          surface, scatter_buffer);
+                sgt = gk20a_mm_pin(dev_from_gk20a(g), compbits_scatter_buf,
+                                   &attachment);
+                if (IS_ERR(sgt)) {
+                        nvgpu_warn(g,
+                                   "mm_pin failed");
+                        err = -EINVAL;
+                        goto exit_unmap_surface;
+                } else {
+                        err = l->ops.cde.populate_scatter_buffer(g, sgt,
+                                        compbits_byte_offset, scatter_buffer,
+                                        scatterbuffer_size);
+                        WARN_ON(err);
+
+                        gk20a_mm_unpin(dev_from_gk20a(g), compbits_scatter_buf,
+                                       attachment, sgt);
+                        if (err)
+                                goto exit_unmap_surface;
+                }
+
+                __cpuc_flush_dcache_area(scatter_buffer, scatterbuffer_size);
+                dma_buf_vunmap(compbits_scatter_buf, surface);
+                surface = NULL;
+        }
+
+        /* store source buffer compression tags */
+        gk20a_get_comptags(&os_buf, &comptags);
+        cde_ctx->surf_param_offset = comptags.offset;
+        cde_ctx->surf_param_lines = comptags.lines;
+
+        /* store surface vaddr. This is actually compbit vaddr, but since
+           compbits live in the same surface, and we can get the alloc base
+           address by using gpuva_to_iova_base, this will do */
+        cde_ctx->surf_vaddr = map_vaddr;
+
+        /* store information about destination */
+        cde_ctx->compbit_vaddr = map_vaddr + mapped_compbits_offset;
+        cde_ctx->compbit_size = compbits_size;
+
+        cde_ctx->scatterbuffer_vaddr = map_vaddr + mapped_scatterbuffer_offset;
+        cde_ctx->scatterbuffer_size = scatterbuffer_size;
+
+        /* remove existing argument data */
+        memset(cde_ctx->user_param_values, 0,
+               sizeof(cde_ctx->user_param_values));
+
+        /* read user space arguments for the conversion */
+        for (i = 0; i < num_params; i++) {
+                struct gk20a_cde_param *param = params + i;
+                int id = param->id - NUM_RESERVED_PARAMS;
+
+                if (id < 0 || id >= MAX_CDE_USER_PARAMS) {
+                        nvgpu_warn(g, "cde: unknown user parameter");
+                        err = -EINVAL;
+                        goto exit_unmap_surface;
+                }
+                cde_ctx->user_param_values[id] = param->value;
+        }
+
+        /* patch data */
+        err = gk20a_cde_patch_params(cde_ctx);
+        if (err) {
+                nvgpu_warn(g, "cde: failed to patch parameters");
+                goto exit_unmap_surface;
+        }
+
+        nvgpu_log(g, gpu_dbg_cde, "cde: buffer=cbc, size=%zu, gpuva=%llx\n",
+                 g->gr.compbit_store.mem.size, cde_ctx->backing_store_vaddr);
+        nvgpu_log(g, gpu_dbg_cde, "cde: buffer=compbits, size=%llu, gpuva=%llx\n",
+                 cde_ctx->compbit_size, cde_ctx->compbit_vaddr);
+        nvgpu_log(g, gpu_dbg_cde, "cde: buffer=scatterbuffer, size=%llu, gpuva=%llx\n",
+                 cde_ctx->scatterbuffer_size, cde_ctx->scatterbuffer_vaddr);
+
+        /* take always the postfence as it is needed for protecting the
+         * cde context */
+        flags = __flags | NVGPU_SUBMIT_FLAGS_FENCE_GET;
+
+        /* gk20a_cde_execute_buffer() will grab a power reference of it's own */
+        gk20a_idle(g);
+
+        if (comptags.lines == 0) {
+                /*
+                 * Nothing to do on the buffer, but do a null kickoff for
+                 * managing the pre and post fences.
+                 */
+                submit_op = TYPE_BUF_COMMAND_NOOP;
+        } else if (!cde_ctx->init_cmd_executed) {
+                /*
+                 * First time, so include the init pushbuf too in addition to
+                 * the conversion code.
+                 */
+                submit_op = TYPE_BUF_COMMAND_INIT;
+        } else {
+                /*
+                 * The usual condition: execute just the conversion.
+                 */
+                submit_op = TYPE_BUF_COMMAND_CONVERT;
+        }
+        err = gk20a_cde_execute_buffer(cde_ctx, submit_op,
+                        fence, flags, fence_out);
+
+        if (comptags.lines != 0 && !err)
+                cde_ctx->init_cmd_executed = true;
+
+        /* unmap the buffers - channel holds references to them now */
+        nvgpu_vm_unmap(cde_ctx->vm, map_vaddr, NULL);
+
+        return err;
+
+exit_unmap_surface:
+        if (surface)
+                dma_buf_vunmap(compbits_scatter_buf, surface);
+exit_unmap_vaddr:
+        nvgpu_vm_unmap(cde_ctx->vm, map_vaddr, NULL);
+exit_idle:
+        gk20a_idle(g);
+        return err;
+}
+
+static void gk20a_cde_finished_ctx_cb(struct channel_gk20a *ch, void *data)
+__acquires(&cde_app->mutex)
+__releases(&cde_app->mutex)
+{
+        struct gk20a_cde_ctx *cde_ctx = data;
+        struct nvgpu_os_linux *l = cde_ctx->l;
+        struct gk20a *g = &l->g;
+        struct gk20a_cde_app *cde_app = &l->cde_app;
+        bool channel_idle;
+
+        channel_gk20a_joblist_lock(ch);
+        channel_idle = channel_gk20a_joblist_is_empty(ch);
+        channel_gk20a_joblist_unlock(ch);
+
+        if (!channel_idle)
+                return;
+
+        trace_gk20a_cde_finished_ctx_cb(cde_ctx);
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_cde_ctx, "cde: finished %p", cde_ctx);
+        if (!cde_ctx->in_use)
+                nvgpu_log_info(g, "double finish cde context %p on channel %p",
+                                cde_ctx, ch);
+
+        if (gk20a_channel_check_timedout(ch)) {
+                if (cde_ctx->is_temporary) {
+                        nvgpu_warn(g,
+                                        "cde: channel had timed out"
+                                        " (temporary channel)");
+                        /* going to be deleted anyway */
+                } else {
+                        nvgpu_warn(g,
+                                        "cde: channel had timed out"
+                                        ", reloading");
+                        /* mark it to be deleted, replace with a new one */
+                        nvgpu_mutex_acquire(&cde_app->mutex);
+                        cde_ctx->is_temporary = true;
+                        if (gk20a_cde_create_context(l)) {
+                                nvgpu_err(g, "cde: can't replace context");
+                        }
+                        nvgpu_mutex_release(&cde_app->mutex);
+                }
+        }
+
+        /* delete temporary contexts later (watch for doubles) */
+        if (cde_ctx->is_temporary && cde_ctx->in_use) {
+                WARN_ON(delayed_work_pending(&cde_ctx->ctx_deleter_work));
+                schedule_delayed_work(&cde_ctx->ctx_deleter_work,
+                        msecs_to_jiffies(CTX_DELETE_TIME));
+        }
+
+        if (!gk20a_channel_check_timedout(ch)) {
+                gk20a_cde_ctx_release(cde_ctx);
+        }
+}
+
+static int gk20a_cde_load(struct gk20a_cde_ctx *cde_ctx)
+{
+        struct nvgpu_os_linux *l = cde_ctx->l;
+        struct gk20a *g = &l->g;
+        struct nvgpu_firmware *img;
+        struct channel_gk20a *ch;
+        struct tsg_gk20a *tsg;
+        struct gr_gk20a *gr = &g->gr;
+        struct nvgpu_setup_bind_args setup_bind_args;
+        int err = 0;
+        u64 vaddr;
+
+        img = nvgpu_request_firmware(g, "gpu2cde.bin", 0);
+        if (!img) {
+                nvgpu_err(g, "cde: could not fetch the firmware");
+                return -ENOSYS;
+        }
+
+        tsg = gk20a_tsg_open(g, nvgpu_current_pid(g));
+        if (!tsg) {
+                nvgpu_err(g, "cde: could not create TSG");
+                err = -ENOMEM;
+                goto err_get_gk20a_channel;
+        }
+
+        ch = gk20a_open_new_channel_with_cb(g, gk20a_cde_finished_ctx_cb,
+                        cde_ctx,
+                        -1,
+                        false);
+        if (!ch) {
+                nvgpu_warn(g, "cde: gk20a channel not available");
+                err = -ENOMEM;
+                goto err_get_gk20a_channel;
+        }
+
+        ch->timeout.enabled = false;
+
+        /* bind the channel to the vm */
+        err = g->ops.mm.vm_bind_channel(g->mm.cde.vm, ch);
+        if (err) {
+                nvgpu_warn(g, "cde: could not bind vm");
+                goto err_commit_va;
+        }
+
+        err = gk20a_tsg_bind_channel(tsg, ch);
+        if (err) {
+                nvgpu_err(g, "cde: unable to bind to tsg");
+                goto err_setup_bind;
+        }
+
+        setup_bind_args.num_gpfifo_entries = 1024;
+        setup_bind_args.num_inflight_jobs = 0;
+        setup_bind_args.flags = 0;
+        err = nvgpu_channel_setup_bind(ch, &setup_bind_args);
+        if (err) {
+                nvgpu_warn(g, "cde: unable to setup channel");
+                goto err_setup_bind;
+        }
+
+        /* map backing store to gpu virtual space */
+        vaddr = nvgpu_gmmu_map(ch->vm, &gr->compbit_store.mem,
+                               g->gr.compbit_store.mem.size,
+                               NVGPU_VM_MAP_CACHEABLE,
+                               gk20a_mem_flag_read_only,
+                               false,
+                               gr->compbit_store.mem.aperture);
+
+        if (!vaddr) {
+                nvgpu_warn(g, "cde: cannot map compression bit backing store");
+                err = -ENOMEM;
+                goto err_map_backingstore;
+        }
+
+        /* store initialisation data */
+        cde_ctx->ch = ch;
+        cde_ctx->tsg = tsg;
+        cde_ctx->vm = ch->vm;
+        cde_ctx->backing_store_vaddr = vaddr;
+
+        /* initialise the firmware */
+        err = gk20a_init_cde_img(cde_ctx, img);
+        if (err) {
+                nvgpu_warn(g, "cde: image initialisation failed");
+                goto err_init_cde_img;
+        }
+
+        /* initialisation done */
+        nvgpu_release_firmware(g, img);
+
+        return 0;
+
+err_init_cde_img:
+        nvgpu_gmmu_unmap(ch->vm, &g->gr.compbit_store.mem, vaddr);
+err_map_backingstore:
+err_setup_bind:
+        nvgpu_vm_put(ch->vm);
+err_commit_va:
+err_get_gk20a_channel:
+        nvgpu_release_firmware(g, img);
+        nvgpu_err(g, "cde: couldn't initialise buffer converter: %d", err);
+        return err;
+}
+
+int gk20a_cde_reload(struct nvgpu_os_linux *l)
+__acquires(&l->cde_app->mutex)
+__releases(&l->cde_app->mutex)
+{
+        struct gk20a *g = &l->g;
+        struct gk20a_cde_app *cde_app = &l->cde_app;
+        int err;
+
+        if (!cde_app->initialised)
+                return -ENOSYS;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        nvgpu_mutex_acquire(&cde_app->mutex);
+
+        gk20a_cde_stop(l);
+
+        err = gk20a_cde_create_contexts(l);
+        if (!err)
+                cde_app->initialised = true;
+
+        nvgpu_mutex_release(&cde_app->mutex);
+
+        gk20a_idle(g);
+        return err;
+}
+
+int gk20a_init_cde_support(struct nvgpu_os_linux *l)
+__acquires(&cde_app->mutex)
+__releases(&cde_app->mutex)
+{
+        struct gk20a_cde_app *cde_app = &l->cde_app;
+        struct gk20a *g = &l->g;
+        int err;
+
+        if (cde_app->initialised)
+                return 0;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_cde_ctx, "cde: init");
+
+        err = nvgpu_mutex_init(&cde_app->mutex);
+        if (err)
+                return err;
+
+        nvgpu_mutex_acquire(&cde_app->mutex);
+
+        nvgpu_init_list_node(&cde_app->free_contexts);
+        nvgpu_init_list_node(&cde_app->used_contexts);
+        cde_app->ctx_count = 0;
+        cde_app->ctx_count_top = 0;
+        cde_app->ctx_usecount = 0;
+
+        err = gk20a_cde_create_contexts(l);
+        if (!err)
+                cde_app->initialised = true;
+
+        nvgpu_mutex_release(&cde_app->mutex);
+        nvgpu_log(g, gpu_dbg_cde_ctx, "cde: init finished: %d", err);
+
+        if (err)
+                nvgpu_mutex_destroy(&cde_app->mutex);
+
+        return err;
+}
+
+enum cde_launch_patch_id {
+        PATCH_H_QMD_CTA_RASTER_WIDTH_ID     = 1024,
+        PATCH_H_QMD_CTA_RASTER_HEIGHT_ID    = 1025,
+        PATCH_QMD_CTA_RASTER_DEPTH_ID       = 1026, /* for firmware v0 only */
+        PATCH_QMD_CTA_THREAD_DIMENSION0_ID  = 1027,
+        PATCH_QMD_CTA_THREAD_DIMENSION1_ID  = 1028,
+        PATCH_QMD_CTA_THREAD_DIMENSION2_ID  = 1029, /* for firmware v0 only */
+        PATCH_USER_CONST_XTILES_ID          = 1030, /* for firmware v0 only */
+        PATCH_USER_CONST_YTILES_ID          = 1031, /* for firmware v0 only */
+        PATCH_USER_CONST_BLOCKHEIGHTLOG2_ID = 1032,
+        PATCH_USER_CONST_DSTPITCH_ID        = 1033, /* for firmware v0 only */
+        PATCH_H_USER_CONST_FLAGS_ID         = 1034, /* for firmware v0 only */
+        PATCH_H_VPC_CURRENT_GRID_SIZE_X_ID  = 1035,
+        PATCH_H_VPC_CURRENT_GRID_SIZE_Y_ID  = 1036,
+        PATCH_H_VPC_CURRENT_GRID_SIZE_Z_ID  = 1037,
+        PATCH_VPC_CURRENT_GROUP_SIZE_X_ID   = 1038,
+        PATCH_VPC_CURRENT_GROUP_SIZE_Y_ID   = 1039,
+        PATCH_VPC_CURRENT_GROUP_SIZE_Z_ID   = 1040,
+        PATCH_USER_CONST_XBLOCKS_ID         = 1041,
+        PATCH_H_USER_CONST_DSTOFFSET_ID     = 1042,
+        PATCH_V_QMD_CTA_RASTER_WIDTH_ID     = 1043,
+        PATCH_V_QMD_CTA_RASTER_HEIGHT_ID    = 1044,
+        PATCH_V_USER_CONST_DSTOFFSET_ID     = 1045,
+        PATCH_V_VPC_CURRENT_GRID_SIZE_X_ID  = 1046,
+        PATCH_V_VPC_CURRENT_GRID_SIZE_Y_ID  = 1047,
+        PATCH_V_VPC_CURRENT_GRID_SIZE_Z_ID  = 1048,
+        PATCH_H_LAUNCH_WORD1_ID             = 1049,
+        PATCH_H_LAUNCH_WORD2_ID             = 1050,
+        PATCH_V_LAUNCH_WORD1_ID             = 1051,
+        PATCH_V_LAUNCH_WORD2_ID             = 1052,
+        PATCH_H_QMD_PROGRAM_OFFSET_ID       = 1053,
+        PATCH_H_QMD_REGISTER_COUNT_ID       = 1054,
+        PATCH_V_QMD_PROGRAM_OFFSET_ID       = 1055,
+        PATCH_V_QMD_REGISTER_COUNT_ID       = 1056,
+};
+
+/* maximum number of WRITE_PATCHes in the below function */
+#define MAX_CDE_LAUNCH_PATCHES            32
+
+static int gk20a_buffer_convert_gpu_to_cde_v1(
+                struct nvgpu_os_linux *l,
+                struct dma_buf *dmabuf, u32 consumer,
+                u64 offset, u64 compbits_hoffset, u64 compbits_voffset,
+                u64 scatterbuffer_offset,
+                u32 width, u32 height, u32 block_height_log2,
+                u32 submit_flags, struct nvgpu_channel_fence *fence_in,
+                struct gk20a_buffer_state *state)
+{
+        struct gk20a *g = &l->g;
+        struct gk20a_cde_param params[MAX_CDE_LAUNCH_PATCHES];
+        int param = 0;
+        int err = 0;
+        struct gk20a_fence *new_fence = NULL;
+        const int wgx = 8;
+        const int wgy = 8;
+        const int compbits_per_byte = 4; /* one byte stores 4 compbit pairs */
+        const int xalign = compbits_per_byte * wgx;
+        const int yalign = wgy;
+
+        /* Compute per launch parameters */
+        const int xtiles = (width + 7) >> 3;
+        const int ytiles = (height + 7) >> 3;
+        const int gridw_h = roundup(xtiles, xalign) / xalign;
+        const int gridh_h = roundup(ytiles, yalign) / yalign;
+        const int gridw_v = roundup(ytiles, xalign) / xalign;
+        const int gridh_v = roundup(xtiles, yalign) / yalign;
+        const int xblocks = (xtiles + 1) >> 1;
+        const int voffset = compbits_voffset - compbits_hoffset;
+
+        int hprog = -1;
+        int vprog = -1;
+
+        if (l->ops.cde.get_program_numbers)
+                l->ops.cde.get_program_numbers(g, block_height_log2,
+                                               l->cde_app.shader_parameter,
+                                               &hprog, &vprog);
+        else {
+                nvgpu_warn(g, "cde: chip not supported");
+                return -ENOSYS;
+        }
+
+        if (hprog < 0 || vprog < 0) {
+                nvgpu_warn(g, "cde: could not determine programs");
+                return -ENOSYS;
+        }
+
+        if (xtiles > 8192 / 8 || ytiles > 8192 / 8)
+                nvgpu_warn(g, "cde: surface is exceptionally large (xtiles=%d, ytiles=%d)",
+                           xtiles, ytiles);
+
+        nvgpu_log(g, gpu_dbg_cde, "w=%d, h=%d, bh_log2=%d, compbits_hoffset=0x%llx, compbits_voffset=0x%llx, scatterbuffer_offset=0x%llx",
+                  width, height, block_height_log2,
+                  compbits_hoffset, compbits_voffset, scatterbuffer_offset);
+        nvgpu_log(g, gpu_dbg_cde, "resolution (%d, %d) tiles (%d, %d)",
+                  width, height, xtiles, ytiles);
+        nvgpu_log(g, gpu_dbg_cde, "group (%d, %d) gridH (%d, %d) gridV (%d, %d)",
+                  wgx, wgy, gridw_h, gridh_h, gridw_v, gridh_v);
+        nvgpu_log(g, gpu_dbg_cde, "hprog=%d, offset=0x%x, regs=%d, vprog=%d, offset=0x%x, regs=%d",
+                  hprog,
+                  l->cde_app.arrays[ARRAY_PROGRAM_OFFSET][hprog],
+                  l->cde_app.arrays[ARRAY_REGISTER_COUNT][hprog],
+                  vprog,
+                  l->cde_app.arrays[ARRAY_PROGRAM_OFFSET][vprog],
+                  l->cde_app.arrays[ARRAY_REGISTER_COUNT][vprog]);
+
+        /* Write parameters */
+#define WRITE_PATCH(NAME, VALUE) \
+        params[param++] = (struct gk20a_cde_param){NAME##_ID, 0, VALUE}
+        WRITE_PATCH(PATCH_USER_CONST_XBLOCKS, xblocks);
+        WRITE_PATCH(PATCH_USER_CONST_BLOCKHEIGHTLOG2,
+                block_height_log2);
+        WRITE_PATCH(PATCH_QMD_CTA_THREAD_DIMENSION0, wgx);
+        WRITE_PATCH(PATCH_QMD_CTA_THREAD_DIMENSION1, wgy);
+        WRITE_PATCH(PATCH_VPC_CURRENT_GROUP_SIZE_X, wgx);
+        WRITE_PATCH(PATCH_VPC_CURRENT_GROUP_SIZE_Y, wgy);
+        WRITE_PATCH(PATCH_VPC_CURRENT_GROUP_SIZE_Z, 1);
+
+        WRITE_PATCH(PATCH_H_QMD_CTA_RASTER_WIDTH, gridw_h);
+        WRITE_PATCH(PATCH_H_QMD_CTA_RASTER_HEIGHT, gridh_h);
+        WRITE_PATCH(PATCH_H_USER_CONST_DSTOFFSET, 0);
+        WRITE_PATCH(PATCH_H_VPC_CURRENT_GRID_SIZE_X, gridw_h);
+        WRITE_PATCH(PATCH_H_VPC_CURRENT_GRID_SIZE_Y, gridh_h);
+        WRITE_PATCH(PATCH_H_VPC_CURRENT_GRID_SIZE_Z, 1);
+
+        WRITE_PATCH(PATCH_V_QMD_CTA_RASTER_WIDTH, gridw_v);
+        WRITE_PATCH(PATCH_V_QMD_CTA_RASTER_HEIGHT, gridh_v);
+        WRITE_PATCH(PATCH_V_USER_CONST_DSTOFFSET, voffset);
+        WRITE_PATCH(PATCH_V_VPC_CURRENT_GRID_SIZE_X, gridw_v);
+        WRITE_PATCH(PATCH_V_VPC_CURRENT_GRID_SIZE_Y, gridh_v);
+        WRITE_PATCH(PATCH_V_VPC_CURRENT_GRID_SIZE_Z, 1);
+
+        WRITE_PATCH(PATCH_H_QMD_PROGRAM_OFFSET,
+                l->cde_app.arrays[ARRAY_PROGRAM_OFFSET][hprog]);
+        WRITE_PATCH(PATCH_H_QMD_REGISTER_COUNT,
+                l->cde_app.arrays[ARRAY_REGISTER_COUNT][hprog]);
+        WRITE_PATCH(PATCH_V_QMD_PROGRAM_OFFSET,
+                l->cde_app.arrays[ARRAY_PROGRAM_OFFSET][vprog]);
+        WRITE_PATCH(PATCH_V_QMD_REGISTER_COUNT,
+                l->cde_app.arrays[ARRAY_REGISTER_COUNT][vprog]);
+
+        if (consumer & NVGPU_GPU_COMPBITS_CDEH) {
+                WRITE_PATCH(PATCH_H_LAUNCH_WORD1,
+                        l->cde_app.arrays[ARRAY_LAUNCH_COMMAND][0]);
+                WRITE_PATCH(PATCH_H_LAUNCH_WORD2,
+                        l->cde_app.arrays[ARRAY_LAUNCH_COMMAND][1]);
+        } else {
+                WRITE_PATCH(PATCH_H_LAUNCH_WORD1,
+                        l->cde_app.arrays[ARRAY_LAUNCH_COMMAND][2]);
+                WRITE_PATCH(PATCH_H_LAUNCH_WORD2,
+                        l->cde_app.arrays[ARRAY_LAUNCH_COMMAND][3]);
+        }
+
+        if (consumer & NVGPU_GPU_COMPBITS_CDEV) {
+                WRITE_PATCH(PATCH_V_LAUNCH_WORD1,
+                        l->cde_app.arrays[ARRAY_LAUNCH_COMMAND][0]);
+                WRITE_PATCH(PATCH_V_LAUNCH_WORD2,
+                        l->cde_app.arrays[ARRAY_LAUNCH_COMMAND][1]);
+        } else {
+                WRITE_PATCH(PATCH_V_LAUNCH_WORD1,
+                        l->cde_app.arrays[ARRAY_LAUNCH_COMMAND][2]);
+                WRITE_PATCH(PATCH_V_LAUNCH_WORD2,
+                        l->cde_app.arrays[ARRAY_LAUNCH_COMMAND][3]);
+        }
+#undef WRITE_PATCH
+
+        err = gk20a_cde_convert(l, dmabuf,
+                                compbits_hoffset,
+                                scatterbuffer_offset,
+                                fence_in, submit_flags,
+                                params, param, &new_fence);
+        if (err)
+                goto out;
+
+        /* compbits generated, update state & fence */
+        gk20a_fence_put(state->fence);
+        state->fence = new_fence;
+        state->valid_compbits |= consumer &
+                (NVGPU_GPU_COMPBITS_CDEH | NVGPU_GPU_COMPBITS_CDEV);
+out:
+        return err;
+}
+
+static int gk20a_buffer_convert_gpu_to_cde(
+                struct nvgpu_os_linux *l, struct dma_buf *dmabuf, u32 consumer,
+                u64 offset, u64 compbits_hoffset, u64 compbits_voffset,
+                u64 scatterbuffer_offset,
+                u32 width, u32 height, u32 block_height_log2,
+                u32 submit_flags, struct nvgpu_channel_fence *fence_in,
+                struct gk20a_buffer_state *state)
+{
+        struct gk20a *g = &l->g;
+        int err = 0;
+
+        if (!l->cde_app.initialised)
+                return -ENOSYS;
+
+        nvgpu_log(g, gpu_dbg_cde, "firmware version = %d\n",
+                l->cde_app.firmware_version);
+
+        if (l->cde_app.firmware_version == 1) {
+                err = gk20a_buffer_convert_gpu_to_cde_v1(
+                    l, dmabuf, consumer, offset, compbits_hoffset,
+                    compbits_voffset, scatterbuffer_offset,
+                    width, height, block_height_log2,
+                    submit_flags, fence_in, state);
+        } else {
+                nvgpu_err(g, "unsupported CDE firmware version %d",
+                        l->cde_app.firmware_version);
+                err = -EINVAL;
+        }
+
+        return err;
+}
+
+int gk20a_prepare_compressible_read(
+                struct nvgpu_os_linux *l, u32 buffer_fd, u32 request, u64 offset,
+                u64 compbits_hoffset, u64 compbits_voffset,
+                u64 scatterbuffer_offset,
+                u32 width, u32 height, u32 block_height_log2,
+                u32 submit_flags, struct nvgpu_channel_fence *fence,
+                u32 *valid_compbits, u32 *zbc_color,
+                struct gk20a_fence **fence_out)
+{
+        struct gk20a *g = &l->g;
+        int err = 0;
+        struct gk20a_buffer_state *state;
+        struct dma_buf *dmabuf;
+        u32 missing_bits;
+
+        dmabuf = dma_buf_get(buffer_fd);
+        if (IS_ERR(dmabuf))
+                return -EINVAL;
+
+        err = gk20a_dmabuf_get_state(dmabuf, g, offset, &state);
+        if (err) {
+                dma_buf_put(dmabuf);
+                return err;
+        }
+
+        missing_bits = (state->valid_compbits ^ request) & request;
+
+        nvgpu_mutex_acquire(&state->lock);
+
+        if (state->valid_compbits && request == NVGPU_GPU_COMPBITS_NONE) {
+
+                gk20a_fence_put(state->fence);
+                state->fence = NULL;
+                /* state->fence = decompress();
+                state->valid_compbits = 0; */
+                err = -EINVAL;
+                goto out;
+        } else if (missing_bits) {
+                u32 missing_cde_bits = missing_bits &
+                         (NVGPU_GPU_COMPBITS_CDEH | NVGPU_GPU_COMPBITS_CDEV);
+                if ((state->valid_compbits & NVGPU_GPU_COMPBITS_GPU) &&
+                    missing_cde_bits) {
+                        err = gk20a_buffer_convert_gpu_to_cde(
+                                        l, dmabuf,
+                                        missing_cde_bits,
+                                        offset, compbits_hoffset,
+                                        compbits_voffset, scatterbuffer_offset,
+                                        width, height, block_height_log2,
+                                        submit_flags, fence,
+                                        state);
+                        if (err)
+                                goto out;
+                }
+        }
+
+        if (state->fence && fence_out)
+                *fence_out = gk20a_fence_get(state->fence);
+
+        if (valid_compbits)
+                *valid_compbits = state->valid_compbits;
+
+        if (zbc_color)
+                *zbc_color = state->zbc_color;
+
+out:
+        nvgpu_mutex_release(&state->lock);
+        dma_buf_put(dmabuf);
+        return err;
+}
+
+int gk20a_mark_compressible_write(struct gk20a *g, u32 buffer_fd,
+                                  u32 valid_compbits, u64 offset, u32 zbc_color)
+{
+        int err;
+        struct gk20a_buffer_state *state;
+        struct dma_buf *dmabuf;
+
+        dmabuf = dma_buf_get(buffer_fd);
+        if (IS_ERR(dmabuf)) {
+                nvgpu_err(g, "invalid dmabuf");
+                return -EINVAL;
+        }
+
+        err = gk20a_dmabuf_get_state(dmabuf, g, offset, &state);
+        if (err) {
+                nvgpu_err(g, "could not get state from dmabuf");
+                dma_buf_put(dmabuf);
+                return err;
+        }
+
+        nvgpu_mutex_acquire(&state->lock);
+
+        /* Update the compbits state. */
+        state->valid_compbits = valid_compbits;
+        state->zbc_color = zbc_color;
+
+        /* Discard previous compbit job fence. */
+        gk20a_fence_put(state->fence);
+        state->fence = NULL;
+
+        nvgpu_mutex_release(&state->lock);
+        dma_buf_put(dmabuf);
+        return 0;
+}
diff --git a/include/os/linux/cde.h b/include/os/linux/cde.h
new file mode 100644
index 0000000..5928b62
--- /dev/null
+++ b/include/os/linux/cde.h
@@ -0,0 +1,326 @@
+/*
+ * GK20A color decompression engine support
+ *
+ * Copyright (c) 2014-2017, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _CDE_GK20A_H_
+#define _CDE_GK20A_H_
+
+#include <nvgpu/nvgpu_mem.h>
+#include <nvgpu/list.h>
+#include <nvgpu/lock.h>
+
+#include <linux/kobject.h>
+#include <linux/workqueue.h>
+
+#define MAX_CDE_BUFS            10
+#define MAX_CDE_PARAMS          64
+#define MAX_CDE_USER_PARAMS     40
+#define MAX_CDE_ARRAY_ENTRIES   9
+
+/*
+ * The size of the context ring buffer that is dedicated for handling cde
+ * jobs.  Re-using a context (=channel) for a differnt cde job forces a cpu
+ * wait on the previous job to that channel, so increasing this value
+ * reduces the likelihood of stalls.
+ */
+#define NUM_CDE_CONTEXTS        4
+
+struct dma_buf;
+struct device;
+struct nvgpu_os_linux;
+struct gk20a;
+struct gk20a_fence;
+struct nvgpu_channel_fence;
+struct channel_gk20a;
+struct vm_gk20a;
+struct nvgpu_gpfifo_entry;
+
+/*
+ * this element defines a buffer that is allocated and mapped into gpu address
+ * space. data_byte_offset defines the beginning of the buffer inside the
+ * firmare. num_bytes defines how many bytes the firmware contains.
+ *
+ * If data_byte_offset is zero, we allocate an empty buffer.
+ */
+
+struct gk20a_cde_hdr_buf {
+        u64 data_byte_offset;
+        u64 num_bytes;
+};
+
+/*
+ * this element defines a constant patching in buffers. It basically
+ * computes physical address to <source_buf>+source_byte_offset. The
+ * address is then modified into patch value as per:
+ *    value = (current_value & ~mask) | (address << shift) & mask .
+ *
+ * The type field defines the register size as:
+ *  0=u32,
+ *  1=u64 (little endian),
+ *  2=u64 (big endian)
+ */
+
+struct gk20a_cde_hdr_replace {
+        u32 target_buf;
+        u32 source_buf;
+        s32 shift;
+        u32 type;
+        u64 target_byte_offset;
+        u64 source_byte_offset;
+        u64 mask;
+};
+
+enum {
+        TYPE_PARAM_TYPE_U32 = 0,
+        TYPE_PARAM_TYPE_U64_LITTLE,
+        TYPE_PARAM_TYPE_U64_BIG
+};
+
+/*
+ * this element defines a runtime patching in buffers. Parameters with id from
+ * 0 to 1024 are reserved for special usage as follows:
+ *   0 = comptags_per_cacheline,
+ *   1 = slices_per_fbp,
+ *   2 = num_fbps
+ *   3 = source buffer first page offset
+ *   4 = source buffer block height log2
+ *   5 = backing store memory address
+ *   6 = destination memory address
+ *   7 = destination size (bytes)
+ *   8 = backing store size (bytes)
+ *   9 = cache line size
+ *
+ * Parameters above id 1024 are user-specified. I.e. they determine where a
+ * parameters from user space should be placed in buffers, what is their
+ * type, etc.
+ *
+ * Once the value is available, we add data_offset to the value.
+ *
+ * The value address is then modified into patch value as per:
+ *    value = (current_value & ~mask) | (address << shift) & mask .
+ *
+ * The type field defines the register size as:
+ *  0=u32,
+ *  1=u64 (little endian),
+ *  2=u64 (big endian)
+ */
+
+struct gk20a_cde_hdr_param {
+        u32 id;
+        u32 target_buf;
+        s32 shift;
+        u32 type;
+        s64 data_offset;
+        u64 target_byte_offset;
+        u64 mask;
+};
+
+enum {
+        TYPE_PARAM_COMPTAGS_PER_CACHELINE = 0,
+        TYPE_PARAM_GPU_CONFIGURATION,
+        TYPE_PARAM_FIRSTPAGEOFFSET,
+        TYPE_PARAM_NUMPAGES,
+        TYPE_PARAM_BACKINGSTORE,
+        TYPE_PARAM_DESTINATION,
+        TYPE_PARAM_DESTINATION_SIZE,
+        TYPE_PARAM_BACKINGSTORE_SIZE,
+        TYPE_PARAM_SOURCE_SMMU_ADDR,
+        TYPE_PARAM_BACKINGSTORE_BASE_HW,
+        TYPE_PARAM_GOBS_PER_COMPTAGLINE_PER_SLICE,
+        TYPE_PARAM_SCATTERBUFFER,
+        TYPE_PARAM_SCATTERBUFFER_SIZE,
+        NUM_RESERVED_PARAMS = 1024,
+};
+
+/*
+ * This header element defines a command. The op field determines whether the
+ * element is defining an init (0) or convert command (1). data_byte_offset
+ * denotes the beginning address of command elements in the file.
+ */
+
+struct gk20a_cde_hdr_command {
+        u32 op;
+        u32 num_entries;
+        u64 data_byte_offset;
+};
+
+enum {
+        TYPE_BUF_COMMAND_INIT = 0,
+        TYPE_BUF_COMMAND_CONVERT,
+        TYPE_BUF_COMMAND_NOOP
+};
+
+/*
+ * This is a command element defines one entry inside push buffer. target_buf
+ * defines the buffer including the pushbuffer entries, target_byte_offset the
+ * offset inside the buffer and num_bytes the number of words in the buffer.
+ */
+
+struct gk20a_cde_cmd_elem {
+        u32 target_buf;
+        u32 padding;
+        u64 target_byte_offset;
+        u64 num_bytes;
+};
+
+/*
+ * This element is used for storing a small array of data.
+ */
+
+enum {
+        ARRAY_PROGRAM_OFFSET = 0,
+        ARRAY_REGISTER_COUNT,
+        ARRAY_LAUNCH_COMMAND,
+        NUM_CDE_ARRAYS
+};
+
+struct gk20a_cde_hdr_array {
+        u32 id;
+        u32 data[MAX_CDE_ARRAY_ENTRIES];
+};
+
+/*
+ * Following defines a single header element. Each element has a type and
+ * some of the data structures.
+ */
+
+struct gk20a_cde_hdr_elem {
+        u32 type;
+        u32 padding;
+        union {
+                struct gk20a_cde_hdr_buf buf;
+                struct gk20a_cde_hdr_replace replace;
+                struct gk20a_cde_hdr_param param;
+                u32 required_class;
+                struct gk20a_cde_hdr_command command;
+                struct gk20a_cde_hdr_array array;
+        };
+};
+
+enum {
+        TYPE_BUF = 0,
+        TYPE_REPLACE,
+        TYPE_PARAM,
+        TYPE_REQUIRED_CLASS,
+        TYPE_COMMAND,
+        TYPE_ARRAY
+};
+
+struct gk20a_cde_param {
+        u32 id;
+        u32 padding;
+        u64 value;
+};
+
+struct gk20a_cde_ctx {
+        struct nvgpu_os_linux *l;
+        struct device *dev;
+
+        /* channel related data */
+        struct channel_gk20a *ch;
+        struct tsg_gk20a *tsg;
+        struct vm_gk20a *vm;
+
+        /* buf converter configuration */
+        struct nvgpu_mem mem[MAX_CDE_BUFS];
+        unsigned int num_bufs;
+
+        /* buffer patching params (where should patching be done) */
+        struct gk20a_cde_hdr_param params[MAX_CDE_PARAMS];
+        unsigned int num_params;
+
+        /* storage for user space parameter values */
+        u32 user_param_values[MAX_CDE_USER_PARAMS];
+
+        u32 surf_param_offset;
+        u32 surf_param_lines;
+        u64 surf_vaddr;
+
+        u64 compbit_vaddr;
+        u64 compbit_size;
+
+        u64 scatterbuffer_vaddr;
+        u64 scatterbuffer_size;
+
+        u64 backing_store_vaddr;
+
+        struct nvgpu_gpfifo_entry *init_convert_cmd;
+        int init_cmd_num_entries;
+
+        struct nvgpu_gpfifo_entry *convert_cmd;
+        int convert_cmd_num_entries;
+
+        struct kobj_attribute attr;
+
+        bool init_cmd_executed;
+
+        struct nvgpu_list_node list;
+        bool is_temporary;
+        bool in_use;
+        struct delayed_work ctx_deleter_work;
+};
+
+static inline struct gk20a_cde_ctx *
+gk20a_cde_ctx_from_list(struct nvgpu_list_node *node)
+{
+        return (struct gk20a_cde_ctx *)
+                ((uintptr_t)node - offsetof(struct gk20a_cde_ctx, list));
+};
+
+struct gk20a_cde_app {
+        bool initialised;
+        struct nvgpu_mutex mutex;
+
+        struct nvgpu_list_node free_contexts;
+        struct nvgpu_list_node used_contexts;
+        unsigned int ctx_count;
+        unsigned int ctx_usecount;
+        unsigned int ctx_count_top;
+
+        u32 firmware_version;
+
+        u32 arrays[NUM_CDE_ARRAYS][MAX_CDE_ARRAY_ENTRIES];
+
+        u32 shader_parameter;
+};
+
+void gk20a_cde_destroy(struct nvgpu_os_linux *l);
+void gk20a_cde_suspend(struct nvgpu_os_linux *l);
+int gk20a_init_cde_support(struct nvgpu_os_linux *l);
+int gk20a_cde_reload(struct nvgpu_os_linux *l);
+int gk20a_cde_convert(struct nvgpu_os_linux *l,
+                struct dma_buf *compbits_buf,
+                u64 compbits_byte_offset,
+                u64 scatterbuffer_byte_offset,
+                struct nvgpu_channel_fence *fence,
+                u32 __flags, struct gk20a_cde_param *params,
+                int num_params, struct gk20a_fence **fence_out);
+
+int gk20a_prepare_compressible_read(
+                struct nvgpu_os_linux *l, u32 buffer_fd, u32 request, u64 offset,
+                u64 compbits_hoffset, u64 compbits_voffset,
+                u64 scatterbuffer_offset,
+                u32 width, u32 height, u32 block_height_log2,
+                u32 submit_flags, struct nvgpu_channel_fence *fence,
+                u32 *valid_compbits, u32 *zbc_color,
+                struct gk20a_fence **fence_out);
+int gk20a_mark_compressible_write(
+                struct gk20a *g, u32 buffer_fd, u32 valid_compbits, u64 offset,
+                u32 zbc_color);
+int nvgpu_cde_init_ops(struct nvgpu_os_linux *l);
+
+#endif
diff --git a/include/os/linux/cde_gm20b.c b/include/os/linux/cde_gm20b.c
new file mode 100644
index 0000000..a9a4754
--- /dev/null
+++ b/include/os/linux/cde_gm20b.c
@@ -0,0 +1,59 @@
+/*
+ * GM20B CDE
+ *
+ * Copyright (c) 2015-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/gk20a.h>
+
+#include "cde_gm20b.h"
+
+enum programs {
+        PROG_HPASS              = 0,
+        PROG_VPASS_LARGE        = 1,
+        PROG_VPASS_SMALL        = 2,
+        PROG_HPASS_DEBUG        = 3,
+        PROG_VPASS_LARGE_DEBUG  = 4,
+        PROG_VPASS_SMALL_DEBUG  = 5,
+        PROG_PASSTHROUGH        = 6,
+};
+
+void gm20b_cde_get_program_numbers(struct gk20a *g,
+                                   u32 block_height_log2,
+                                   u32 shader_parameter,
+                                   int *hprog_out, int *vprog_out)
+{
+        int hprog = PROG_HPASS;
+        int vprog = (block_height_log2 >= 2) ?
+                PROG_VPASS_LARGE : PROG_VPASS_SMALL;
+        if (shader_parameter == 1) {
+                hprog = PROG_PASSTHROUGH;
+                vprog = PROG_PASSTHROUGH;
+        } else if (shader_parameter == 2) {
+                hprog = PROG_HPASS_DEBUG;
+                vprog = (block_height_log2 >= 2) ?
+                        PROG_VPASS_LARGE_DEBUG :
+                        PROG_VPASS_SMALL_DEBUG;
+        }
+
+        *hprog_out = hprog;
+        *vprog_out = vprog;
+}
diff --git a/include/os/linux/cde_gm20b.h b/include/os/linux/cde_gm20b.h
new file mode 100644
index 0000000..fac8aaf
--- /dev/null
+++ b/include/os/linux/cde_gm20b.h
@@ -0,0 +1,33 @@
+/*
+ * GM20B CDE
+ *
+ * Copyright (c) 2015-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _NVHOST_GM20B_CDE
+#define _NVHOST_GM20B_CDE
+
+void gm20b_cde_get_program_numbers(struct gk20a *g,
+                                   u32 block_height_log2,
+                                   u32 shader_parameter,
+                                   int *hprog_out, int *vprog_out);
+
+#endif
diff --git a/include/os/linux/cde_gp10b.c b/include/os/linux/cde_gp10b.c
new file mode 100644
index 0000000..6356d33
--- /dev/null
+++ b/include/os/linux/cde_gp10b.c
@@ -0,0 +1,153 @@
+/*
+ * GP10B CDE
+ *
+ * Copyright (c) 2015-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/log.h>
+#include <nvgpu/dma.h>
+#include <nvgpu/gk20a.h>
+
+#include "cde_gp10b.h"
+
+enum gp10b_programs {
+        GP10B_PROG_HPASS              = 0,
+        GP10B_PROG_HPASS_4K           = 1,
+        GP10B_PROG_VPASS              = 2,
+        GP10B_PROG_VPASS_4K           = 3,
+        GP10B_PROG_HPASS_DEBUG        = 4,
+        GP10B_PROG_HPASS_4K_DEBUG     = 5,
+        GP10B_PROG_VPASS_DEBUG        = 6,
+        GP10B_PROG_VPASS_4K_DEBUG     = 7,
+        GP10B_PROG_PASSTHROUGH        = 8,
+};
+
+void gp10b_cde_get_program_numbers(struct gk20a *g,
+                                          u32 block_height_log2,
+                                          u32 shader_parameter,
+                                          int *hprog_out, int *vprog_out)
+{
+        int hprog, vprog;
+
+        if (shader_parameter == 1) {
+                hprog = GP10B_PROG_PASSTHROUGH;
+                vprog = GP10B_PROG_PASSTHROUGH;
+        } else {
+                hprog = GP10B_PROG_HPASS;
+                vprog = GP10B_PROG_VPASS;
+                if (shader_parameter == 2) {
+                        hprog = GP10B_PROG_HPASS_DEBUG;
+                        vprog = GP10B_PROG_VPASS_DEBUG;
+                }
+                if (!nvgpu_iommuable(g)) {
+                        if (!g->mm.disable_bigpage) {
+                                nvgpu_warn(g,
+                                           "When no IOMMU big pages cannot be used");
+                        }
+                        hprog |= 1;
+                        vprog |= 1;
+                }
+        }
+
+        *hprog_out = hprog;
+        *vprog_out = vprog;
+}
+
+bool gp10b_need_scatter_buffer(struct gk20a *g)
+{
+        return !nvgpu_iommuable(g);
+}
+
+static u8 parity(u32 a)
+{
+        a ^= a>>16u;
+        a ^= a>>8u;
+        a ^= a>>4u;
+        a &= 0xfu;
+        return (0x6996u >> a) & 1u;
+}
+
+int gp10b_populate_scatter_buffer(struct gk20a *g,
+                                         struct sg_table *sgt,
+                                         size_t surface_size,
+                                         void *scatter_buffer_ptr,
+                                         size_t scatter_buffer_size)
+{
+        /* map scatter buffer to CPU VA and fill it */
+        const u32 page_size_log2 = 12;
+        const u32 page_size = 1 << page_size_log2;
+        const u32 page_size_shift = page_size_log2 - 7u;
+
+        /* 0011 1111 1111 1111 1111 1110 0100 1000 */
+        const u32 getSliceMaskGP10B = 0x3ffffe48;
+        u8 *scatter_buffer = scatter_buffer_ptr;
+
+        size_t i;
+        struct scatterlist *sg = NULL;
+        u8 d = 0;
+        size_t page = 0;
+        size_t pages_left;
+
+        surface_size = round_up(surface_size, page_size);
+
+        pages_left = surface_size >> page_size_log2;
+        if ((pages_left >> 3) > scatter_buffer_size)
+            return -ENOMEM;
+
+        for_each_sg(sgt->sgl, sg, sgt->nents, i) {
+                unsigned int j;
+                u64 surf_pa = sg_phys(sg);
+                unsigned int n = (int)(sg->length >> page_size_log2);
+
+                nvgpu_log(g, gpu_dbg_cde, "surfPA=0x%llx + %d pages", surf_pa, n);
+
+                for (j=0; j < n && pages_left > 0; j++, surf_pa += page_size) {
+                        u32 addr = (((u32)(surf_pa>>7)) & getSliceMaskGP10B) >> page_size_shift;
+                        u8 scatter_bit = parity(addr);
+                        u8 bit = page & 7;
+
+                        d |= scatter_bit << bit;
+                        if (bit == 7) {
+                                scatter_buffer[page >> 3] = d;
+                                d = 0;
+                        }
+
+                        ++page;
+                        --pages_left;
+                }
+
+                if (pages_left == 0)
+                        break;
+        }
+
+        /* write the last byte in case the number of pages is not divisible by 8 */
+        if ((page & 7) != 0)
+                scatter_buffer[page >> 3] = d;
+
+        if (nvgpu_log_mask_enabled(g, gpu_dbg_cde)) {
+                nvgpu_log(g, gpu_dbg_cde, "scatterBuffer content:");
+                for (i = 0; i < page >> 3; i++) {
+                        nvgpu_log(g, gpu_dbg_cde, " %x", scatter_buffer[i]);
+                }
+        }
+
+        return 0;
+}
diff --git a/include/os/linux/cde_gp10b.h b/include/os/linux/cde_gp10b.h
new file mode 100644
index 0000000..3ecca2a
--- /dev/null
+++ b/include/os/linux/cde_gp10b.h
@@ -0,0 +1,40 @@
+/*
+ * GP10B CDE
+ *
+ * Copyright (c) 2015-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _NVHOST_GP10B_CDE
+#define _NVHOST_GP10B_CDE
+
+#include "os_linux.h"
+
+void gp10b_cde_get_program_numbers(struct gk20a *g,
+                                   u32 block_height_log2,
+                                   u32 shader_parameter,
+                                   int *hprog_out, int *vprog_out);
+bool gp10b_need_scatter_buffer(struct gk20a *g);
+int gp10b_populate_scatter_buffer(struct gk20a *g,
+                                  struct sg_table *sgt,
+                                  size_t surface_size,
+                                  void *scatter_buffer_ptr,
+                                  size_t scatter_buffer_size);
+#endif
diff --git a/include/os/linux/channel.h b/include/os/linux/channel.h
new file mode 100644
index 0000000..e6326fa
--- /dev/null
+++ b/include/os/linux/channel.h
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef NVGPU_LINUX_CHANNEL_H
+#define NVGPU_LINUX_CHANNEL_H
+
+#include <linux/workqueue.h>
+#include <linux/dma-buf.h>
+
+#include <nvgpu/types.h>
+
+struct channel_gk20a;
+struct nvgpu_gpfifo;
+struct nvgpu_submit_gpfifo_args;
+struct nvgpu_channel_fence;
+struct gk20a_fence;
+struct fifo_profile_gk20a;
+struct nvgpu_os_linux;
+
+struct sync_fence;
+struct sync_timeline;
+
+struct nvgpu_channel_completion_cb {
+        /*
+         * Signal channel owner via a callback, if set, in job cleanup with
+         * schedule_work. Means that something finished on the channel (perhaps
+         * more than one job).
+         */
+        void (*fn)(struct channel_gk20a *, void *);
+        void *user_data;
+        /* Make access to the two above atomic */
+        struct nvgpu_spinlock lock;
+        /* Per-channel async work task, cannot reschedule itself */
+        struct work_struct work;
+};
+
+struct nvgpu_error_notifier {
+        struct dma_buf *dmabuf;
+        void *vaddr;
+
+        struct nvgpu_notification *notification;
+
+        struct nvgpu_mutex mutex;
+};
+
+/*
+ * This struct contains fence_related data.
+ * e.g. sync_timeline for sync_fences.
+ */
+struct nvgpu_os_fence_framework {
+        struct sync_timeline *timeline;
+};
+
+struct nvgpu_usermode_bufs_linux {
+        /*
+         * Common low level info of these is stored in nvgpu_mems in
+         * channel_gk20a; these hold lifetimes for the actual dmabuf and its
+         * dma mapping.
+         */
+        struct nvgpu_usermode_buf_linux {
+                struct dma_buf *dmabuf;
+                struct dma_buf_attachment *attachment;
+                struct sg_table *sgt;
+        } gpfifo, userd;
+};
+
+struct nvgpu_channel_linux {
+        struct channel_gk20a *ch;
+
+        struct nvgpu_os_fence_framework fence_framework;
+
+        struct nvgpu_channel_completion_cb completion_cb;
+        struct nvgpu_error_notifier error_notifier;
+
+        struct dma_buf *cyclestate_buffer_handler;
+
+        struct nvgpu_usermode_bufs_linux usermode;
+};
+
+u32 nvgpu_submit_gpfifo_user_flags_to_common_flags(u32 user_flags);
+int nvgpu_init_channel_support_linux(struct nvgpu_os_linux *l);
+void nvgpu_remove_channel_support_linux(struct nvgpu_os_linux *l);
+
+struct channel_gk20a *gk20a_open_new_channel_with_cb(struct gk20a *g,
+                void (*update_fn)(struct channel_gk20a *, void *),
+                void *update_fn_data,
+                int runlist_id,
+                bool is_privileged_channel);
+
+#endif
diff --git a/include/os/linux/clk.c b/include/os/linux/clk.c
new file mode 100644
index 0000000..e9796ea
--- /dev/null
+++ b/include/os/linux/clk.c
@@ -0,0 +1,286 @@
+/*
+ * Linux clock support
+ *
+ * Copyright (c) 2017-2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+
+#include <soc/tegra/tegra-dvfs.h>
+#include <soc/tegra/tegra-bpmp-dvfs.h>
+
+#include "clk.h"
+#include "os_linux.h"
+#include "platform_gk20a.h"
+
+#include <nvgpu/gk20a.h>
+#include <nvgpu/clk_arb.h>
+
+#define HZ_TO_MHZ(x) ((x) / 1000000)
+
+static unsigned long nvgpu_linux_clk_get_rate(struct gk20a *g, u32 api_domain)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev_from_gk20a(g));
+        unsigned long ret;
+
+        switch (api_domain) {
+        case CTRL_CLK_DOMAIN_GPCCLK:
+                if (g->clk.tegra_clk)
+                        ret = clk_get_rate(g->clk.tegra_clk);
+                else
+                        ret = clk_get_rate(platform->clk[0]);
+                break;
+        case CTRL_CLK_DOMAIN_PWRCLK:
+                ret = clk_get_rate(platform->clk[1]);
+                break;
+        default:
+                nvgpu_err(g, "unknown clock: %u", api_domain);
+                ret = 0;
+                break;
+        }
+
+        return ret;
+}
+
+static int nvgpu_linux_clk_set_rate(struct gk20a *g,
+                                     u32 api_domain, unsigned long rate)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev_from_gk20a(g));
+        int ret;
+
+        switch (api_domain) {
+        case CTRL_CLK_DOMAIN_GPCCLK:
+                if (g->clk.tegra_clk)
+                        ret = clk_set_rate(g->clk.tegra_clk, rate);
+                else
+                        ret = clk_set_rate(platform->clk[0], rate);
+                break;
+        case CTRL_CLK_DOMAIN_PWRCLK:
+                ret = clk_set_rate(platform->clk[1], rate);
+                break;
+        default:
+                nvgpu_err(g, "unknown clock: %u", api_domain);
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+static unsigned long nvgpu_linux_get_fmax_at_vmin_safe(struct gk20a *g)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev_from_gk20a(g));
+
+        /*
+         * On Tegra platforms with GPCPLL bus (gbus) GPU tegra_clk clock exposed
+         * to frequency governor is a shared user on the gbus. The latter can be
+         * accessed as GPU clock parent, and incorporate DVFS related data.
+         */
+        if (g->clk.tegra_clk)
+                return tegra_dvfs_get_fmax_at_vmin_safe_t(
+                        g->clk.tegra_clk_parent);
+
+        if (platform->maxmin_clk_id)
+                return tegra_bpmp_dvfs_get_fmax_at_vmin(
+                        platform->maxmin_clk_id);
+
+        return 0;
+}
+
+static u32 nvgpu_linux_get_ref_clock_rate(struct gk20a *g)
+{
+        struct clk *c;
+
+        c = clk_get_sys("gpu_ref", "gpu_ref");
+        if (IS_ERR(c)) {
+                nvgpu_err(g, "failed to get GPCPLL reference clock");
+                return 0;
+        }
+
+        return clk_get_rate(c);
+}
+
+static int nvgpu_linux_predict_mv_at_hz_cur_tfloor(struct clk_gk20a *clk,
+        unsigned long rate)
+{
+        return tegra_dvfs_predict_mv_at_hz_cur_tfloor(
+                                clk->tegra_clk_parent, rate);
+}
+
+static unsigned long nvgpu_linux_get_maxrate(struct gk20a *g, u32 api_domain)
+{
+        int ret;
+        u16 min_mhz, max_mhz;
+
+        switch (api_domain) {
+        case CTRL_CLK_DOMAIN_GPCCLK:
+                ret = tegra_dvfs_get_maxrate(g->clk.tegra_clk_parent);
+                /* If dvfs not supported */
+                if (ret == 0) {
+                        int err = nvgpu_clk_arb_get_arbiter_clk_range(g,
+                                        NVGPU_CLK_DOMAIN_GPCCLK,
+                                        &min_mhz, &max_mhz);
+                        if (err == 0) {
+                                ret = max_mhz * 1000000L;
+                        }
+                }
+                break;
+        default:
+                nvgpu_err(g, "unknown clock: %u", api_domain);
+                ret = 0;
+                break;
+        }
+
+        return ret;
+}
+
+/*
+ * This API is used to return a list of supported frequencies by igpu.
+ * Set *num_points as 0 to get the size of the freqs list, returned
+ * by *num_points itself. freqs array must be provided by caller.
+ * If *num_points is non-zero, then freqs array size must atleast
+ * equal *num_points.
+ */
+static int nvgpu_linux_clk_get_f_points(struct gk20a *g,
+        u32 api_domain, u32 *num_points, u16 *freqs)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        unsigned long *gpu_freq_table;
+        int ret = 0;
+        int num_supported_freq = 0;
+        u32 i;
+
+        switch (api_domain) {
+        case CTRL_CLK_DOMAIN_GPCCLK:
+                ret = platform->get_clk_freqs(dev, &gpu_freq_table,
+                 &num_supported_freq);
+
+                if (ret) {
+                        return ret;
+                }
+
+                if (num_points == NULL) {
+                        return -EINVAL;
+                }
+
+                if (*num_points != 0U) {
+                        if (freqs == NULL || (*num_points > (u32)num_supported_freq)) {
+                                return -EINVAL;
+                        }
+                }
+
+                if (*num_points == 0) {
+                        *num_points = num_supported_freq;
+                } else {
+                        for (i = 0; i < *num_points; i++) {
+                                freqs[i] = HZ_TO_MHZ(gpu_freq_table[i]);
+                        }
+                }
+                break;
+        default:
+                nvgpu_err(g, "unknown clock: %u", api_domain);
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+static int nvgpu_clk_get_range(struct gk20a *g, u32 api_domain,
+                u16 *min_mhz, u16 *max_mhz)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        unsigned long *freqs;
+        int num_freqs;
+        int ret;
+
+        switch (api_domain) {
+        case CTRL_CLK_DOMAIN_GPCCLK:
+                ret = platform->get_clk_freqs(dev, &freqs, &num_freqs);
+
+                if (!ret) {
+                        *min_mhz = HZ_TO_MHZ(freqs[0]);
+                        *max_mhz = HZ_TO_MHZ(freqs[num_freqs - 1]);
+                }
+                break;
+        default:
+                nvgpu_err(g, "unknown clock: %u", api_domain);
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+/* rate_target should be passed in as Hz
+   rounded_rate is returned in Hz */
+static int nvgpu_clk_get_round_rate(struct gk20a *g,
+                u32 api_domain, unsigned long rate_target,
+                unsigned long *rounded_rate)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        unsigned long *freqs;
+        int num_freqs;
+        int i, ret = 0;
+
+        switch (api_domain) {
+        case CTRL_CLK_DOMAIN_GPCCLK:
+                ret = platform->get_clk_freqs(dev, &freqs, &num_freqs);
+
+                for (i = 0; i < num_freqs; ++i) {
+                        if (freqs[i] >= rate_target) {
+                                *rounded_rate = freqs[i];
+                                return 0;
+                        }
+                }
+                *rounded_rate = freqs[num_freqs - 1];
+                break;
+        default:
+                nvgpu_err(g, "unknown clock: %u", api_domain);
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+static int nvgpu_linux_prepare_enable(struct clk_gk20a *clk)
+{
+        return clk_prepare_enable(clk->tegra_clk);
+}
+
+static void nvgpu_linux_disable_unprepare(struct clk_gk20a *clk)
+{
+        clk_disable_unprepare(clk->tegra_clk);
+}
+
+void nvgpu_linux_init_clk_support(struct gk20a *g)
+{
+        g->ops.clk.get_rate = nvgpu_linux_clk_get_rate;
+        g->ops.clk.set_rate = nvgpu_linux_clk_set_rate;
+        g->ops.clk.get_fmax_at_vmin_safe = nvgpu_linux_get_fmax_at_vmin_safe;
+        g->ops.clk.get_ref_clock_rate = nvgpu_linux_get_ref_clock_rate;
+        g->ops.clk.predict_mv_at_hz_cur_tfloor = nvgpu_linux_predict_mv_at_hz_cur_tfloor;
+        g->ops.clk.get_maxrate = nvgpu_linux_get_maxrate;
+        g->ops.clk.prepare_enable = nvgpu_linux_prepare_enable;
+        g->ops.clk.disable_unprepare = nvgpu_linux_disable_unprepare;
+        g->ops.clk.clk_domain_get_f_points = nvgpu_linux_clk_get_f_points;
+        g->ops.clk.get_clk_range = nvgpu_clk_get_range;
+        g->ops.clk.clk_get_round_rate = nvgpu_clk_get_round_rate;
+        g->ops.clk.measure_freq = nvgpu_clk_measure_freq;
+}
diff --git a/include/os/linux/clk.h b/include/os/linux/clk.h
new file mode 100644
index 0000000..614a7fd
--- /dev/null
+++ b/include/os/linux/clk.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NVGPU_COMMON_LINUX_CLK_H
+
+struct gk20a;
+void nvgpu_linux_init_clk_support(struct gk20a *g);
+
+#endif
diff --git a/include/os/linux/comptags.c b/include/os/linux/comptags.c
new file mode 100644
index 0000000..ab37197
--- /dev/null
+++ b/include/os/linux/comptags.c
@@ -0,0 +1,140 @@
+/*
+* Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/dma-buf.h>
+
+#include <nvgpu/comptags.h>
+#include <nvgpu/gk20a.h>
+
+#include <nvgpu/linux/vm.h>
+
+#include "dmabuf.h"
+
+void gk20a_get_comptags(struct nvgpu_os_buffer *buf,
+                        struct gk20a_comptags *comptags)
+{
+        struct gk20a_dmabuf_priv *priv = dma_buf_get_drvdata(buf->dmabuf,
+                                                             buf->dev);
+
+        if (!comptags)
+                return;
+
+        if (!priv) {
+                memset(comptags, 0, sizeof(*comptags));
+                return;
+        }
+
+        nvgpu_mutex_acquire(&priv->lock);
+        *comptags = priv->comptags;
+        nvgpu_mutex_release(&priv->lock);
+}
+
+int gk20a_alloc_or_get_comptags(struct gk20a *g,
+                                struct nvgpu_os_buffer *buf,
+                                struct gk20a_comptag_allocator *allocator,
+                                struct gk20a_comptags *comptags)
+{
+        struct gk20a_dmabuf_priv *priv = dma_buf_get_drvdata(buf->dmabuf,
+                                                             buf->dev);
+        u32 offset;
+        int err;
+        unsigned int ctag_granularity;
+        u32 lines;
+
+        if (!priv)
+                return -ENOSYS;
+
+        nvgpu_mutex_acquire(&priv->lock);
+
+        if (priv->comptags.allocated) {
+                /*
+                 * already allocated
+                 */
+                *comptags = priv->comptags;
+
+                err = 0;
+                goto exit_locked;
+        }
+
+        ctag_granularity = g->ops.fb.compression_page_size(g);
+        lines = DIV_ROUND_UP_ULL(buf->dmabuf->size, ctag_granularity);
+
+        /* 0-sized buffer? Shouldn't occur, but let's check anyways. */
+        if (lines < 1) {
+                err = -EINVAL;
+                goto exit_locked;
+        }
+
+        /* store the allocator so we can use it when we free the ctags */
+        priv->comptag_allocator = allocator;
+        err = gk20a_comptaglines_alloc(allocator, &offset, lines);
+        if (!err) {
+                priv->comptags.offset = offset;
+                priv->comptags.lines = lines;
+                priv->comptags.needs_clear = true;
+        } else {
+                priv->comptags.offset = 0;
+                priv->comptags.lines = 0;
+                priv->comptags.needs_clear = false;
+        }
+
+        /*
+         * We don't report an error here if comptag alloc failed. The
+         * caller will simply fallback to incompressible kinds. It
+         * would not be safe to re-allocate comptags anyways on
+         * successive calls, as that would break map aliasing.
+         */
+        err = 0;
+        priv->comptags.allocated = true;
+
+        *comptags = priv->comptags;
+
+exit_locked:
+        nvgpu_mutex_release(&priv->lock);
+
+        return err;
+}
+
+bool gk20a_comptags_start_clear(struct nvgpu_os_buffer *buf)
+{
+        struct gk20a_dmabuf_priv *priv = dma_buf_get_drvdata(buf->dmabuf,
+                                                             buf->dev);
+        bool clear_started = false;
+
+        if (priv) {
+                nvgpu_mutex_acquire(&priv->lock);
+
+                clear_started = priv->comptags.needs_clear;
+
+                if (!clear_started)
+                        nvgpu_mutex_release(&priv->lock);
+        }
+
+        return clear_started;
+}
+
+void gk20a_comptags_finish_clear(struct nvgpu_os_buffer *buf,
+                                 bool clear_successful)
+{
+        struct gk20a_dmabuf_priv *priv = dma_buf_get_drvdata(buf->dmabuf,
+                                                             buf->dev);
+        if (priv) {
+                if (clear_successful)
+                        priv->comptags.needs_clear = false;
+
+                nvgpu_mutex_release(&priv->lock);
+        }
+}
diff --git a/include/os/linux/cond.c b/include/os/linux/cond.c
new file mode 100644
index 0000000..633c34f
--- /dev/null
+++ b/include/os/linux/cond.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/wait.h>
+#include <linux/sched.h>
+
+#include <nvgpu/cond.h>
+
+int nvgpu_cond_init(struct nvgpu_cond *cond)
+{
+        init_waitqueue_head(&cond->wq);
+        cond->initialized = true;
+
+        return 0;
+}
+
+void nvgpu_cond_destroy(struct nvgpu_cond *cond)
+{
+        cond->initialized = false;
+}
+
+int nvgpu_cond_signal(struct nvgpu_cond *cond)
+{
+        if (!cond->initialized)
+                return -EINVAL;
+
+        wake_up(&cond->wq);
+
+        return 0;
+}
+
+int nvgpu_cond_signal_interruptible(struct nvgpu_cond *cond)
+{
+        if (!cond->initialized)
+                return -EINVAL;
+
+        wake_up_interruptible(&cond->wq);
+
+        return 0;
+}
+
+int nvgpu_cond_broadcast(struct nvgpu_cond *cond)
+{
+        if (!cond->initialized)
+                return -EINVAL;
+
+        wake_up_all(&cond->wq);
+
+        return 0;
+}
+
+int nvgpu_cond_broadcast_interruptible(struct nvgpu_cond *cond)
+{
+        if (!cond->initialized)
+                return -EINVAL;
+
+        wake_up_interruptible_all(&cond->wq);
+
+        return 0;
+}
diff --git a/include/os/linux/ctxsw_trace.c b/include/os/linux/ctxsw_trace.c
new file mode 100644
index 0000000..2d36d9c
--- /dev/null
+++ b/include/os/linux/ctxsw_trace.c
@@ -0,0 +1,792 @@
+/*
+ * Copyright (c) 2016-2020, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/wait.h>
+#include <linux/ktime.h>
+#include <linux/uaccess.h>
+#include <linux/poll.h>
+#include <trace/events/gk20a.h>
+#include <uapi/linux/nvgpu.h>
+#include <nvgpu/ctxsw_trace.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/log.h>
+#include <nvgpu/atomic.h>
+#include <nvgpu/barrier.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/channel.h>
+
+#include "gk20a/gr_gk20a.h"
+#include "gk20a/fecs_trace_gk20a.h"
+
+#include "platform_gk20a.h"
+#include "os_linux.h"
+#include "ctxsw_trace.h"
+
+#include <nvgpu/hw/gk20a/hw_ctxsw_prog_gk20a.h>
+#include <nvgpu/hw/gk20a/hw_gr_gk20a.h>
+
+#define GK20A_CTXSW_TRACE_MAX_VM_RING_SIZE      (128*PAGE_SIZE)
+
+/* Userland-facing FIFO (one global + eventually one per VM) */
+struct gk20a_ctxsw_dev {
+        struct gk20a *g;
+
+        struct nvgpu_ctxsw_ring_header *hdr;
+        struct nvgpu_gpu_ctxsw_trace_entry *ents;
+        struct nvgpu_gpu_ctxsw_trace_filter filter;
+        bool write_enabled;
+        struct nvgpu_cond readout_wq;
+        size_t size;
+        u32 num_ents;
+
+        nvgpu_atomic_t vma_ref;
+
+        struct nvgpu_mutex write_lock;
+};
+
+
+struct gk20a_ctxsw_trace {
+        struct gk20a_ctxsw_dev devs[GK20A_CTXSW_TRACE_NUM_DEVS];
+};
+
+static inline int ring_is_empty(struct nvgpu_ctxsw_ring_header *hdr)
+{
+        return (hdr->write_idx == hdr->read_idx);
+}
+
+static inline int ring_is_full(struct nvgpu_ctxsw_ring_header *hdr)
+{
+        return ((hdr->write_idx + 1) % hdr->num_ents) == hdr->read_idx;
+}
+
+static inline int ring_len(struct nvgpu_ctxsw_ring_header *hdr)
+{
+        return (hdr->write_idx - hdr->read_idx) % hdr->num_ents;
+}
+
+static void nvgpu_set_ctxsw_trace_entry(struct nvgpu_ctxsw_trace_entry *entry_dst,
+        struct nvgpu_gpu_ctxsw_trace_entry *entry_src)
+{
+        entry_dst->tag = entry_src->tag;
+        entry_dst->vmid = entry_src->vmid;
+        entry_dst->seqno = entry_src->seqno;
+        entry_dst->context_id = entry_src->context_id;
+        entry_dst->pid = entry_src->pid;
+        entry_dst->timestamp = entry_src->timestamp;
+}
+
+ssize_t gk20a_ctxsw_dev_read(struct file *filp, char __user *buf, size_t size,
+        loff_t *off)
+{
+        struct gk20a_ctxsw_dev *dev = filp->private_data;
+        struct gk20a *g = dev->g;
+        struct nvgpu_ctxsw_ring_header *hdr = dev->hdr;
+        struct nvgpu_ctxsw_trace_entry __user *entry =
+                (struct nvgpu_ctxsw_trace_entry *) buf;
+        struct nvgpu_ctxsw_trace_entry user_entry;
+        size_t copied = 0;
+        int err;
+
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_ctxsw,
+                "filp=%p buf=%p size=%zu", filp, buf, size);
+
+        nvgpu_mutex_acquire(&dev->write_lock);
+        while (ring_is_empty(hdr)) {
+                nvgpu_mutex_release(&dev->write_lock);
+                if (filp->f_flags & O_NONBLOCK)
+                        return -EAGAIN;
+                err = NVGPU_COND_WAIT_INTERRUPTIBLE(&dev->readout_wq,
+                        !ring_is_empty(hdr), 0);
+                if (err)
+                        return err;
+                nvgpu_mutex_acquire(&dev->write_lock);
+        }
+
+        while (size >= sizeof(struct nvgpu_gpu_ctxsw_trace_entry)) {
+                if (ring_is_empty(hdr))
+                        break;
+
+                nvgpu_set_ctxsw_trace_entry(&user_entry, &dev->ents[hdr->read_idx]);
+                if (copy_to_user(entry, &user_entry,
+                        sizeof(*entry))) {
+                        nvgpu_mutex_release(&dev->write_lock);
+                        return -EFAULT;
+                }
+
+                hdr->read_idx++;
+                if (hdr->read_idx >= hdr->num_ents)
+                        hdr->read_idx = 0;
+
+                entry++;
+                copied += sizeof(*entry);
+                size -= sizeof(*entry);
+        }
+
+        nvgpu_log(g, gpu_dbg_ctxsw, "copied=%zu read_idx=%d", copied,
+                hdr->read_idx);
+
+        *off = hdr->read_idx;
+        nvgpu_mutex_release(&dev->write_lock);
+
+        return copied;
+}
+
+static int gk20a_ctxsw_dev_ioctl_trace_enable(struct gk20a_ctxsw_dev *dev)
+{
+        struct gk20a *g = dev->g;
+
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_ctxsw, "trace enabled");
+        nvgpu_mutex_acquire(&dev->write_lock);
+        dev->write_enabled = true;
+        nvgpu_mutex_release(&dev->write_lock);
+        dev->g->ops.fecs_trace.enable(dev->g);
+        return 0;
+}
+
+static int gk20a_ctxsw_dev_ioctl_trace_disable(struct gk20a_ctxsw_dev *dev)
+{
+        struct gk20a *g = dev->g;
+
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_ctxsw, "trace disabled");
+        dev->g->ops.fecs_trace.disable(dev->g);
+        nvgpu_mutex_acquire(&dev->write_lock);
+        dev->write_enabled = false;
+        nvgpu_mutex_release(&dev->write_lock);
+        return 0;
+}
+
+static int gk20a_ctxsw_dev_alloc_buffer(struct gk20a_ctxsw_dev *dev,
+                                        size_t size)
+{
+        struct gk20a *g = dev->g;
+        void *buf;
+        int err;
+
+        if ((dev->write_enabled) || (nvgpu_atomic_read(&dev->vma_ref)))
+                return -EBUSY;
+
+        err = g->ops.fecs_trace.alloc_user_buffer(g, &buf, &size);
+        if (err)
+                return err;
+
+
+        dev->hdr = buf;
+        dev->ents = (struct nvgpu_gpu_ctxsw_trace_entry *) (dev->hdr + 1);
+        dev->size = size;
+        dev->num_ents = dev->hdr->num_ents;
+
+        nvgpu_log(g, gpu_dbg_ctxsw, "size=%zu hdr=%p ents=%p num_ents=%d",
+                dev->size, dev->hdr, dev->ents, dev->hdr->num_ents);
+        return 0;
+}
+
+int gk20a_ctxsw_dev_ring_alloc(struct gk20a *g,
+                void **buf, size_t *size)
+{
+        struct nvgpu_ctxsw_ring_header *hdr;
+
+        *size = roundup(*size, PAGE_SIZE);
+        hdr = vmalloc_user(*size);
+        if (!hdr)
+                return -ENOMEM;
+
+        hdr->magic = NVGPU_CTXSW_RING_HEADER_MAGIC;
+        hdr->version = NVGPU_CTXSW_RING_HEADER_VERSION;
+        hdr->num_ents = (*size - sizeof(struct nvgpu_ctxsw_ring_header))
+                / sizeof(struct nvgpu_gpu_ctxsw_trace_entry);
+        hdr->ent_size = sizeof(struct nvgpu_gpu_ctxsw_trace_entry);
+        hdr->drop_count = 0;
+        hdr->read_idx = 0;
+        hdr->write_idx = 0;
+        hdr->write_seqno = 0;
+
+        *buf = hdr;
+        return 0;
+}
+
+int gk20a_ctxsw_dev_ring_free(struct gk20a *g)
+{
+        struct gk20a_ctxsw_dev *dev = &g->ctxsw_trace->devs[0];
+
+        nvgpu_vfree(g, dev->hdr);
+        return 0;
+}
+
+static int gk20a_ctxsw_dev_ioctl_ring_setup(struct gk20a_ctxsw_dev *dev,
+        struct nvgpu_ctxsw_ring_setup_args *args)
+{
+        struct gk20a *g = dev->g;
+        size_t size = args->size;
+        int ret;
+
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_ctxsw, "size=%zu", size);
+
+        if (size > GK20A_CTXSW_TRACE_MAX_VM_RING_SIZE)
+                return -EINVAL;
+
+        nvgpu_mutex_acquire(&dev->write_lock);
+        ret = gk20a_ctxsw_dev_alloc_buffer(dev, size);
+        nvgpu_mutex_release(&dev->write_lock);
+
+        return ret;
+}
+
+static void nvgpu_set_ctxsw_trace_filter_args(struct nvgpu_gpu_ctxsw_trace_filter *filter_dst,
+        struct nvgpu_ctxsw_trace_filter *filter_src)
+{
+        memcpy(filter_dst->tag_bits, filter_src->tag_bits, (NVGPU_CTXSW_FILTER_SIZE + 63) / 64);
+}
+
+static void nvgpu_get_ctxsw_trace_filter_args(struct nvgpu_ctxsw_trace_filter *filter_dst,
+        struct nvgpu_gpu_ctxsw_trace_filter *filter_src)
+{
+        memcpy(filter_dst->tag_bits, filter_src->tag_bits, (NVGPU_CTXSW_FILTER_SIZE + 63) / 64);
+}
+
+static int gk20a_ctxsw_dev_ioctl_set_filter(struct gk20a_ctxsw_dev *dev,
+        struct nvgpu_ctxsw_trace_filter_args *args)
+{
+        struct gk20a *g = dev->g;
+
+        nvgpu_mutex_acquire(&dev->write_lock);
+        nvgpu_set_ctxsw_trace_filter_args(&dev->filter, &args->filter);
+        nvgpu_mutex_release(&dev->write_lock);
+
+        if (g->ops.fecs_trace.set_filter)
+                g->ops.fecs_trace.set_filter(g, &dev->filter);
+        return 0;
+}
+
+static int gk20a_ctxsw_dev_ioctl_get_filter(struct gk20a_ctxsw_dev *dev,
+        struct nvgpu_ctxsw_trace_filter_args *args)
+{
+        nvgpu_mutex_acquire(&dev->write_lock);
+        nvgpu_get_ctxsw_trace_filter_args(&args->filter, &dev->filter);
+        nvgpu_mutex_release(&dev->write_lock);
+
+        return 0;
+}
+
+static int gk20a_ctxsw_dev_ioctl_poll(struct gk20a_ctxsw_dev *dev)
+{
+        struct gk20a *g = dev->g;
+        int err;
+
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_ctxsw, " ");
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        if (g->ops.fecs_trace.flush)
+                err = g->ops.fecs_trace.flush(g);
+
+        if (likely(!err))
+                err = g->ops.fecs_trace.poll(g);
+
+        gk20a_idle(g);
+        return err;
+}
+
+int gk20a_ctxsw_dev_open(struct inode *inode, struct file *filp)
+{
+        struct nvgpu_os_linux *l;
+        struct gk20a *g;
+        struct gk20a_ctxsw_trace *trace;
+        struct gk20a_ctxsw_dev *dev;
+        int err;
+        size_t size;
+        u32 n;
+
+        /* only one VM for now */
+        const int vmid = 0;
+
+        l = container_of(inode->i_cdev, struct nvgpu_os_linux, ctxsw.cdev);
+        g = gk20a_get(&l->g);
+        if (!g)
+                return -ENODEV;
+
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_ctxsw, "g=%p", g);
+
+        err = gk20a_busy(g);
+        if (err)
+                goto free_ref;
+
+        trace = g->ctxsw_trace;
+        if (!trace) {
+                err = -ENODEV;
+                goto idle;
+        }
+
+        /* Allow only one user for this device */
+        dev = &trace->devs[vmid];
+        nvgpu_mutex_acquire(&dev->write_lock);
+        if (dev->hdr) {
+                err = -EBUSY;
+                goto done;
+        }
+
+        /* By default, allocate ring buffer big enough to accommodate
+         * FECS records with default event filter */
+
+        /* enable all traces by default */
+        NVGPU_CTXSW_FILTER_SET_ALL(&dev->filter);
+
+        /* compute max number of entries generated with this filter */
+        n = g->ops.fecs_trace.max_entries(g, &dev->filter);
+
+        size = sizeof(struct nvgpu_ctxsw_ring_header) +
+                        n * sizeof(struct nvgpu_gpu_ctxsw_trace_entry);
+        nvgpu_log(g, gpu_dbg_ctxsw, "size=%zu entries=%d ent_size=%zu",
+                size, n, sizeof(struct nvgpu_gpu_ctxsw_trace_entry));
+
+        err = gk20a_ctxsw_dev_alloc_buffer(dev, size);
+        if (!err) {
+                filp->private_data = dev;
+                nvgpu_log(g, gpu_dbg_ctxsw, "filp=%p dev=%p size=%zu",
+                        filp, dev, size);
+        }
+
+done:
+        nvgpu_mutex_release(&dev->write_lock);
+
+idle:
+        gk20a_idle(g);
+free_ref:
+        if (err)
+                gk20a_put(g);
+        return err;
+}
+
+int gk20a_ctxsw_dev_release(struct inode *inode, struct file *filp)
+{
+        struct gk20a_ctxsw_dev *dev = filp->private_data;
+        struct gk20a *g = dev->g;
+
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_ctxsw, "dev: %p", dev);
+
+        g->ops.fecs_trace.disable(g);
+
+        nvgpu_mutex_acquire(&dev->write_lock);
+        dev->write_enabled = false;
+        nvgpu_mutex_release(&dev->write_lock);
+
+        if (dev->hdr) {
+                dev->g->ops.fecs_trace.free_user_buffer(dev->g);
+                dev->hdr = NULL;
+        }
+        gk20a_put(g);
+        return 0;
+}
+
+long gk20a_ctxsw_dev_ioctl(struct file *filp, unsigned int cmd,
+        unsigned long arg)
+{
+        struct gk20a_ctxsw_dev *dev = filp->private_data;
+        struct gk20a *g = dev->g;
+        u8 buf[NVGPU_CTXSW_IOCTL_MAX_ARG_SIZE];
+        int err = 0;
+
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_ctxsw, "nr=%d", _IOC_NR(cmd));
+
+        if ((_IOC_TYPE(cmd) != NVGPU_CTXSW_IOCTL_MAGIC) ||
+                (_IOC_NR(cmd) == 0) ||
+                (_IOC_NR(cmd) > NVGPU_CTXSW_IOCTL_LAST) ||
+                (_IOC_SIZE(cmd) > NVGPU_CTXSW_IOCTL_MAX_ARG_SIZE))
+                return -EINVAL;
+
+        memset(buf, 0, sizeof(buf));
+        if (_IOC_DIR(cmd) & _IOC_WRITE) {
+                if (copy_from_user(buf, (void __user *) arg, _IOC_SIZE(cmd)))
+                        return -EFAULT;
+        }
+
+        switch (cmd) {
+        case NVGPU_CTXSW_IOCTL_TRACE_ENABLE:
+                err = gk20a_ctxsw_dev_ioctl_trace_enable(dev);
+                break;
+        case NVGPU_CTXSW_IOCTL_TRACE_DISABLE:
+                err = gk20a_ctxsw_dev_ioctl_trace_disable(dev);
+                break;
+        case NVGPU_CTXSW_IOCTL_RING_SETUP:
+                err = gk20a_ctxsw_dev_ioctl_ring_setup(dev,
+                        (struct nvgpu_ctxsw_ring_setup_args *) buf);
+                break;
+        case NVGPU_CTXSW_IOCTL_SET_FILTER:
+                err = gk20a_ctxsw_dev_ioctl_set_filter(dev,
+                        (struct nvgpu_ctxsw_trace_filter_args *) buf);
+                break;
+        case NVGPU_CTXSW_IOCTL_GET_FILTER:
+                err = gk20a_ctxsw_dev_ioctl_get_filter(dev,
+                        (struct nvgpu_ctxsw_trace_filter_args *) buf);
+                break;
+        case NVGPU_CTXSW_IOCTL_POLL:
+                err = gk20a_ctxsw_dev_ioctl_poll(dev);
+                break;
+        default:
+                dev_dbg(dev_from_gk20a(g), "unrecognized gpu ioctl cmd: 0x%x",
+                        cmd);
+                err = -ENOTTY;
+        }
+
+        if ((err == 0) && (_IOC_DIR(cmd) & _IOC_READ))
+                err = copy_to_user((void __user *) arg, buf, _IOC_SIZE(cmd));
+
+        return err;
+}
+
+unsigned int gk20a_ctxsw_dev_poll(struct file *filp, poll_table *wait)
+{
+        struct gk20a_ctxsw_dev *dev = filp->private_data;
+        struct gk20a *g = dev->g;
+        struct nvgpu_ctxsw_ring_header *hdr = dev->hdr;
+        unsigned int mask = 0;
+
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_ctxsw, " ");
+
+        nvgpu_mutex_acquire(&dev->write_lock);
+        poll_wait(filp, &dev->readout_wq.wq, wait);
+        if (!ring_is_empty(hdr))
+                mask |= POLLIN | POLLRDNORM;
+        nvgpu_mutex_release(&dev->write_lock);
+
+        return mask;
+}
+
+static void gk20a_ctxsw_dev_vma_open(struct vm_area_struct *vma)
+{
+        struct gk20a_ctxsw_dev *dev = vma->vm_private_data;
+        struct gk20a *g = dev->g;
+
+        nvgpu_atomic_inc(&dev->vma_ref);
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_ctxsw, "vma_ref=%d",
+                nvgpu_atomic_read(&dev->vma_ref));
+}
+
+static void gk20a_ctxsw_dev_vma_close(struct vm_area_struct *vma)
+{
+        struct gk20a_ctxsw_dev *dev = vma->vm_private_data;
+        struct gk20a *g = dev->g;
+
+        nvgpu_atomic_dec(&dev->vma_ref);
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_ctxsw, "vma_ref=%d",
+                nvgpu_atomic_read(&dev->vma_ref));
+}
+
+static struct vm_operations_struct gk20a_ctxsw_dev_vma_ops = {
+        .open = gk20a_ctxsw_dev_vma_open,
+        .close = gk20a_ctxsw_dev_vma_close,
+};
+
+int gk20a_ctxsw_dev_mmap_buffer(struct gk20a *g,
+                                struct vm_area_struct *vma)
+{
+        return remap_vmalloc_range(vma, g->ctxsw_trace->devs[0].hdr, 0);
+}
+
+int gk20a_ctxsw_dev_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+        struct gk20a_ctxsw_dev *dev = filp->private_data;
+        struct gk20a *g = dev->g;
+        int ret;
+
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_ctxsw, "vm_start=%lx vm_end=%lx",
+                vma->vm_start, vma->vm_end);
+
+        ret = dev->g->ops.fecs_trace.mmap_user_buffer(dev->g, vma);
+        if (likely(!ret)) {
+                vma->vm_private_data = dev;
+                vma->vm_ops = &gk20a_ctxsw_dev_vma_ops;
+                vma->vm_ops->open(vma);
+        }
+
+        return ret;
+}
+
+#ifdef CONFIG_GK20A_CTXSW_TRACE
+static int gk20a_ctxsw_init_devs(struct gk20a *g)
+{
+        struct gk20a_ctxsw_trace *trace = g->ctxsw_trace;
+        struct gk20a_ctxsw_dev *dev = trace->devs;
+        int err;
+        int i;
+
+        for (i = 0; i < GK20A_CTXSW_TRACE_NUM_DEVS; i++) {
+                dev->g = g;
+                dev->hdr = NULL;
+                dev->write_enabled = false;
+                nvgpu_cond_init(&dev->readout_wq);
+                err = nvgpu_mutex_init(&dev->write_lock);
+                if (err)
+                        return err;
+                nvgpu_atomic_set(&dev->vma_ref, 0);
+                dev++;
+        }
+        return 0;
+}
+#endif
+
+int gk20a_ctxsw_trace_init(struct gk20a *g)
+{
+#ifdef CONFIG_GK20A_CTXSW_TRACE
+        struct gk20a_ctxsw_trace *trace = g->ctxsw_trace;
+        int err;
+
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_ctxsw, "g=%p trace=%p", g, trace);
+
+        /* if tracing is not supported, skip this */
+        if (!g->ops.fecs_trace.init)
+                return 0;
+
+        if (likely(trace)) {
+                __nvgpu_set_enabled(g, NVGPU_SUPPORT_FECS_CTXSW_TRACE, true);
+                return 0;
+        }
+
+        trace = nvgpu_kzalloc(g, sizeof(*trace));
+        if (unlikely(!trace))
+                return -ENOMEM;
+        g->ctxsw_trace = trace;
+
+        err = gk20a_ctxsw_init_devs(g);
+        if (err)
+                goto fail;
+
+        err = g->ops.fecs_trace.init(g);
+        if (unlikely(err))
+                goto fail;
+
+        return 0;
+
+fail:
+        memset(&g->ops.fecs_trace, 0, sizeof(g->ops.fecs_trace));
+        nvgpu_kfree(g, trace);
+        g->ctxsw_trace = NULL;
+        return err;
+#else
+        return 0;
+#endif
+}
+
+void gk20a_ctxsw_trace_cleanup(struct gk20a *g)
+{
+#ifdef CONFIG_GK20A_CTXSW_TRACE
+        struct gk20a_ctxsw_trace *trace;
+        struct gk20a_ctxsw_dev *dev;
+        int i;
+
+        if (!g->ctxsw_trace)
+                return;
+
+        trace = g->ctxsw_trace;
+        dev = trace->devs;
+
+        for (i = 0; i < GK20A_CTXSW_TRACE_NUM_DEVS; i++) {
+                nvgpu_mutex_destroy(&dev->write_lock);
+                dev++;
+        }
+
+        nvgpu_kfree(g, g->ctxsw_trace);
+        g->ctxsw_trace = NULL;
+
+        g->ops.fecs_trace.deinit(g);
+#endif
+}
+
+int gk20a_ctxsw_trace_write(struct gk20a *g,
+                struct nvgpu_gpu_ctxsw_trace_entry *entry)
+{
+        struct nvgpu_ctxsw_ring_header *hdr;
+        struct gk20a_ctxsw_dev *dev;
+        int ret = 0;
+        const char *reason;
+        u32 write_idx;
+
+        if (!g->ctxsw_trace)
+                return 0;
+
+        if (unlikely(entry->vmid >= GK20A_CTXSW_TRACE_NUM_DEVS))
+                return -ENODEV;
+
+        dev = &g->ctxsw_trace->devs[entry->vmid];
+        hdr = dev->hdr;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_ctxsw,
+                "dev=%p hdr=%p", dev, hdr);
+
+        nvgpu_mutex_acquire(&dev->write_lock);
+
+        if (unlikely(!hdr)) {
+                /* device has been released */
+                ret = -ENODEV;
+                goto done;
+        }
+
+        write_idx = hdr->write_idx;
+        if (write_idx >= dev->num_ents) {
+                nvgpu_err(dev->g,
+                        "write_idx=%u out of range [0..%u]",
+                        write_idx, dev->num_ents);
+                ret = -ENOSPC;
+                reason = "write_idx out of range";
+                goto disable;
+        }
+
+        entry->seqno = hdr->write_seqno++;
+
+        if (!dev->write_enabled) {
+                ret = -EBUSY;
+                reason = "write disabled";
+                goto drop;
+        }
+
+        if (unlikely(ring_is_full(hdr))) {
+                ret = -ENOSPC;
+                reason = "user fifo full";
+                goto drop;
+        }
+
+        if (!NVGPU_GPU_CTXSW_FILTER_ISSET(entry->tag, &dev->filter)) {
+                reason = "filtered out";
+                goto filter;
+        }
+
+        nvgpu_log(g, gpu_dbg_ctxsw,
+                "seqno=%d context_id=%08x pid=%lld tag=%x timestamp=%llx",
+                entry->seqno, entry->context_id, entry->pid,
+                entry->tag, entry->timestamp);
+
+        dev->ents[write_idx] = *entry;
+
+        /* ensure record is written before updating write index */
+        nvgpu_smp_wmb();
+
+        write_idx++;
+        if (unlikely(write_idx >= hdr->num_ents))
+                write_idx = 0;
+        hdr->write_idx = write_idx;
+        nvgpu_log(g, gpu_dbg_ctxsw, "added: read=%d write=%d len=%d",
+                hdr->read_idx, hdr->write_idx, ring_len(hdr));
+
+        nvgpu_mutex_release(&dev->write_lock);
+        return ret;
+
+disable:
+        g->ops.fecs_trace.disable(g);
+
+drop:
+        hdr->drop_count++;
+
+filter:
+        nvgpu_log(g, gpu_dbg_ctxsw,
+                        "dropping seqno=%d context_id=%08x pid=%lld "
+                        "tag=%x time=%llx (%s)",
+                        entry->seqno, entry->context_id, entry->pid,
+                        entry->tag, entry->timestamp, reason);
+
+done:
+        nvgpu_mutex_release(&dev->write_lock);
+        return ret;
+}
+
+void gk20a_ctxsw_trace_wake_up(struct gk20a *g, int vmid)
+{
+        struct gk20a_ctxsw_dev *dev;
+
+        if (!g->ctxsw_trace)
+                return;
+
+        dev = &g->ctxsw_trace->devs[vmid];
+        nvgpu_cond_signal_interruptible(&dev->readout_wq);
+}
+
+void gk20a_ctxsw_trace_channel_reset(struct gk20a *g, struct channel_gk20a *ch)
+{
+#ifdef CONFIG_GK20A_CTXSW_TRACE
+        struct nvgpu_gpu_ctxsw_trace_entry entry = {
+                .vmid = 0,
+                .tag = NVGPU_CTXSW_TAG_ENGINE_RESET,
+                .context_id = 0,
+                .pid = ch->tgid,
+        };
+
+        if (!g->ctxsw_trace)
+                return;
+
+        g->ops.ptimer.read_ptimer(g, &entry.timestamp);
+        gk20a_ctxsw_trace_write(g, &entry);
+        gk20a_ctxsw_trace_wake_up(g, 0);
+#endif
+        trace_gk20a_channel_reset(ch->chid, ch->tsgid);
+}
+
+void gk20a_ctxsw_trace_tsg_reset(struct gk20a *g, struct tsg_gk20a *tsg)
+{
+#ifdef CONFIG_GK20A_CTXSW_TRACE
+        struct nvgpu_gpu_ctxsw_trace_entry entry = {
+                .vmid = 0,
+                .tag = NVGPU_CTXSW_TAG_ENGINE_RESET,
+                .context_id = 0,
+                .pid = tsg->tgid,
+        };
+
+        if (!g->ctxsw_trace)
+                return;
+
+        g->ops.ptimer.read_ptimer(g, &entry.timestamp);
+        gk20a_ctxsw_trace_write(g, &entry);
+        gk20a_ctxsw_trace_wake_up(g, 0);
+#endif
+        trace_gk20a_channel_reset(~0, tsg->tsgid);
+}
+
+/*
+ * Convert linux nvgpu ctxsw tags type of the form of NVGPU_CTXSW_TAG_*
+ * into common nvgpu ctxsw tags type of the form of NVGPU_GPU_CTXSW_TAG_*
+ */
+
+u8 nvgpu_gpu_ctxsw_tags_to_common_tags(u8 tags)
+{
+        switch (tags){
+        case NVGPU_CTXSW_TAG_SOF:
+                return NVGPU_GPU_CTXSW_TAG_SOF;
+        case NVGPU_CTXSW_TAG_CTXSW_REQ_BY_HOST:
+                return NVGPU_GPU_CTXSW_TAG_CTXSW_REQ_BY_HOST;
+        case NVGPU_CTXSW_TAG_FE_ACK:
+                return NVGPU_GPU_CTXSW_TAG_FE_ACK;
+        case NVGPU_CTXSW_TAG_FE_ACK_WFI:
+                return NVGPU_GPU_CTXSW_TAG_FE_ACK_WFI;
+        case NVGPU_CTXSW_TAG_FE_ACK_GFXP:
+                return NVGPU_GPU_CTXSW_TAG_FE_ACK_GFXP;
+        case NVGPU_CTXSW_TAG_FE_ACK_CTAP:
+                return NVGPU_GPU_CTXSW_TAG_FE_ACK_CTAP;
+        case NVGPU_CTXSW_TAG_FE_ACK_CILP:
+                return NVGPU_GPU_CTXSW_TAG_FE_ACK_CILP;
+        case NVGPU_CTXSW_TAG_SAVE_END:
+                return NVGPU_GPU_CTXSW_TAG_SAVE_END;
+        case NVGPU_CTXSW_TAG_RESTORE_START:
+                return NVGPU_GPU_CTXSW_TAG_RESTORE_START;
+        case NVGPU_CTXSW_TAG_CONTEXT_START:
+                return NVGPU_GPU_CTXSW_TAG_CONTEXT_START;
+        case NVGPU_CTXSW_TAG_ENGINE_RESET:
+                return NVGPU_GPU_CTXSW_TAG_ENGINE_RESET;
+        case NVGPU_CTXSW_TAG_INVALID_TIMESTAMP:
+                return NVGPU_GPU_CTXSW_TAG_INVALID_TIMESTAMP;
+        }
+
+        WARN_ON(1);
+        return tags;
+}
diff --git a/include/os/linux/ctxsw_trace.h b/include/os/linux/ctxsw_trace.h
new file mode 100644
index 0000000..88ca7f2
--- /dev/null
+++ b/include/os/linux/ctxsw_trace.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2016-2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __CTXSW_TRACE_H__
+#define __CTXSW_TRACE_H__
+
+#include <nvgpu/types.h>
+
+#define GK20A_CTXSW_TRACE_NUM_DEVS                      1
+
+struct file;
+struct inode;
+struct poll_table_struct;
+
+struct gk20a;
+
+int gk20a_ctxsw_dev_release(struct inode *inode, struct file *filp);
+int gk20a_ctxsw_dev_open(struct inode *inode, struct file *filp);
+long gk20a_ctxsw_dev_ioctl(struct file *filp,
+                         unsigned int cmd, unsigned long arg);
+ssize_t gk20a_ctxsw_dev_read(struct file *filp, char __user *buf,
+                             size_t size, loff_t *offs);
+unsigned int gk20a_ctxsw_dev_poll(struct file *filp,
+                                  struct poll_table_struct *pts);
+
+#endif /* __CTXSW_TRACE_H__ */
diff --git a/include/os/linux/debug.c b/include/os/linux/debug.c
new file mode 100644
index 0000000..5f0703c
--- /dev/null
+++ b/include/os/linux/debug.c
@@ -0,0 +1,457 @@
+/*
+ * Copyright (C) 2017-2018 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include "debug_cde.h"
+#include "debug_ce.h"
+#include "debug_fifo.h"
+#include "debug_gr.h"
+#include "debug_allocator.h"
+#include "debug_kmem.h"
+#include "debug_pmu.h"
+#include "debug_sched.h"
+#include "debug_hal.h"
+#include "debug_xve.h"
+#include "debug_ltc.h"
+#include "debug_bios.h"
+#include "os_linux.h"
+#include "platform_gk20a.h"
+
+#include <nvgpu/gk20a.h>
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+
+#include <nvgpu/debug.h>
+
+unsigned int gk20a_debug_trace_cmdbuf;
+
+static inline void gk20a_debug_write_printk(void *ctx, const char *str,
+                                            size_t len)
+{
+        pr_info("%s", str);
+}
+
+static inline void gk20a_debug_write_to_seqfile(void *ctx, const char *str,
+                                                size_t len)
+{
+        seq_write((struct seq_file *)ctx, str, len);
+}
+
+void gk20a_debug_output(struct gk20a_debug_output *o,
+                                        const char *fmt, ...)
+{
+        va_list args;
+        int len;
+
+        va_start(args, fmt);
+        len = vsnprintf(o->buf, sizeof(o->buf), fmt, args);
+        va_end(args);
+        o->fn(o->ctx, o->buf, len);
+}
+
+static int gk20a_gr_dump_regs(struct gk20a *g,
+                struct gk20a_debug_output *o)
+{
+        if (g->ops.gr.dump_gr_regs)
+                gr_gk20a_elpg_protected_call(g, g->ops.gr.dump_gr_regs(g, o));
+
+        return 0;
+}
+
+int gk20a_gr_debug_dump(struct gk20a *g)
+{
+        struct gk20a_debug_output o = {
+                .fn = gk20a_debug_write_printk
+        };
+
+        gk20a_gr_dump_regs(g, &o);
+
+        return 0;
+}
+
+static int gk20a_gr_debug_show(struct seq_file *s, void *unused)
+{
+        struct device *dev = s->private;
+        struct gk20a *g = gk20a_get_platform(dev)->g;
+        struct gk20a_debug_output o = {
+                .fn = gk20a_debug_write_to_seqfile,
+                .ctx = s,
+        };
+        int err;
+
+        err = gk20a_busy(g);
+        if (err) {
+                nvgpu_err(g, "failed to power on gpu: %d", err);
+                return -EINVAL;
+        }
+
+        gk20a_gr_dump_regs(g, &o);
+
+        gk20a_idle(g);
+
+        return 0;
+}
+
+void gk20a_debug_dump(struct gk20a *g)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev_from_gk20a(g));
+        struct gk20a_debug_output o = {
+                .fn = gk20a_debug_write_printk
+        };
+
+        if (platform->dump_platform_dependencies)
+                platform->dump_platform_dependencies(dev_from_gk20a(g));
+
+        /* HAL only initialized after 1st power-on */
+        if (g->ops.debug.show_dump)
+                g->ops.debug.show_dump(g, &o);
+}
+
+static int gk20a_debug_show(struct seq_file *s, void *unused)
+{
+        struct device *dev = s->private;
+        struct gk20a_debug_output o = {
+                .fn = gk20a_debug_write_to_seqfile,
+                .ctx = s,
+        };
+        struct gk20a *g;
+        int err;
+
+        g = gk20a_get_platform(dev)->g;
+
+        err = gk20a_busy(g);
+        if (err) {
+                nvgpu_err(g, "failed to power on gpu: %d", err);
+                return -EFAULT;
+        }
+
+        /* HAL only initialized after 1st power-on */
+        if (g->ops.debug.show_dump)
+                g->ops.debug.show_dump(g, &o);
+
+        gk20a_idle(g);
+        return 0;
+}
+
+static int gk20a_gr_debug_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, gk20a_gr_debug_show, inode->i_private);
+}
+
+static int gk20a_debug_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, gk20a_debug_show, inode->i_private);
+}
+
+static const struct file_operations gk20a_gr_debug_fops = {
+        .open           = gk20a_gr_debug_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static const struct file_operations gk20a_debug_fops = {
+        .open           = gk20a_debug_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+void gk20a_debug_show_dump(struct gk20a *g, struct gk20a_debug_output *o)
+{
+        g->ops.fifo.dump_pbdma_status(g, o);
+        g->ops.fifo.dump_eng_status(g, o);
+
+        gk20a_debug_dump_all_channel_status_ramfc(g, o);
+}
+
+static ssize_t disable_bigpage_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos)
+{
+        char buf[3];
+        struct gk20a *g = file->private_data;
+
+        if (g->mm.disable_bigpage)
+                buf[0] = 'Y';
+        else
+                buf[0] = 'N';
+        buf[1] = '\n';
+        buf[2] = 0x00;
+        return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+}
+
+static ssize_t disable_bigpage_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos)
+{
+        char buf[32];
+        int buf_size;
+        bool bv;
+        struct gk20a *g = file->private_data;
+
+        buf_size = min(count, (sizeof(buf)-1));
+        if (copy_from_user(buf, user_buf, buf_size))
+                return -EFAULT;
+
+        if (strtobool(buf, &bv) == 0) {
+                g->mm.disable_bigpage = bv;
+                gk20a_init_gpu_characteristics(g);
+        }
+
+        return count;
+}
+
+static struct file_operations disable_bigpage_fops = {
+        .open =         simple_open,
+        .read =         disable_bigpage_read,
+        .write =        disable_bigpage_write,
+};
+
+static int railgate_residency_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+        struct gk20a_platform *platform = dev_get_drvdata(dev_from_gk20a(g));
+        unsigned long time_since_last_state_transition_ms;
+        unsigned long total_rail_gate_time_ms;
+        unsigned long total_rail_ungate_time_ms;
+
+        if (platform->is_railgated(dev_from_gk20a(g))) {
+                time_since_last_state_transition_ms =
+                                jiffies_to_msecs(jiffies -
+                                g->pstats.last_rail_gate_complete);
+                total_rail_ungate_time_ms = g->pstats.total_rail_ungate_time_ms;
+                total_rail_gate_time_ms =
+                                        g->pstats.total_rail_gate_time_ms +
+                                        time_since_last_state_transition_ms;
+        } else {
+                time_since_last_state_transition_ms =
+                                jiffies_to_msecs(jiffies -
+                                g->pstats.last_rail_ungate_complete);
+                total_rail_gate_time_ms = g->pstats.total_rail_gate_time_ms;
+                total_rail_ungate_time_ms =
+                                        g->pstats.total_rail_ungate_time_ms +
+                                        time_since_last_state_transition_ms;
+        }
+
+        seq_printf(s, "Time with Rails Gated: %lu ms\n"
+                        "Time with Rails UnGated: %lu ms\n"
+                        "Total railgating cycles: %lu\n",
+                        total_rail_gate_time_ms,
+                        total_rail_ungate_time_ms,
+                        g->pstats.railgating_cycle_count - 1);
+        return 0;
+
+}
+
+static int railgate_residency_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, railgate_residency_show, inode->i_private);
+}
+
+static const struct file_operations railgate_residency_fops = {
+        .open           = railgate_residency_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int gk20a_railgating_debugfs_init(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct dentry *d;
+
+        d = debugfs_create_file(
+                "railgate_residency", S_IRUGO|S_IWUSR, l->debugfs, g,
+                                                &railgate_residency_fops);
+        if (!d)
+                return -ENOMEM;
+
+        return 0;
+}
+static ssize_t timeouts_enabled_read(struct file *file,
+                        char __user *user_buf, size_t count, loff_t *ppos)
+{
+        char buf[3];
+        struct gk20a *g = file->private_data;
+
+        if (nvgpu_is_timeouts_enabled(g))
+                buf[0] = 'Y';
+        else
+                buf[0] = 'N';
+        buf[1] = '\n';
+        buf[2] = 0x00;
+        return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+}
+
+static ssize_t timeouts_enabled_write(struct file *file,
+                        const char __user *user_buf, size_t count, loff_t *ppos)
+{
+        char buf[3];
+        int buf_size;
+        bool timeouts_enabled;
+        struct gk20a *g = file->private_data;
+
+        buf_size = min(count, (sizeof(buf)-1));
+        if (copy_from_user(buf, user_buf, buf_size))
+                return -EFAULT;
+
+        if (strtobool(buf, &timeouts_enabled) == 0) {
+                nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+                if (timeouts_enabled == false) {
+                        /* requesting to disable timeouts */
+                        if (g->timeouts_disabled_by_user == false) {
+                                nvgpu_atomic_inc(&g->timeouts_disabled_refcount);
+                                g->timeouts_disabled_by_user = true;
+                        }
+                } else {
+                        /* requesting to enable timeouts */
+                        if (g->timeouts_disabled_by_user == true) {
+                                nvgpu_atomic_dec(&g->timeouts_disabled_refcount);
+                                g->timeouts_disabled_by_user = false;
+                        }
+                }
+                nvgpu_mutex_release(&g->dbg_sessions_lock);
+        }
+
+        return count;
+}
+
+static const struct file_operations timeouts_enabled_fops = {
+        .open =         simple_open,
+        .read =         timeouts_enabled_read,
+        .write =        timeouts_enabled_write,
+};
+
+void gk20a_debug_init(struct gk20a *g, const char *debugfs_symlink)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct device *dev = dev_from_gk20a(g);
+
+        l->debugfs = debugfs_create_dir(dev_name(dev), NULL);
+        if (!l->debugfs)
+                return;
+
+        if (debugfs_symlink)
+                l->debugfs_alias =
+                        debugfs_create_symlink(debugfs_symlink,
+                                        NULL, dev_name(dev));
+
+        debugfs_create_file("status", S_IRUGO, l->debugfs,
+                dev, &gk20a_debug_fops);
+        debugfs_create_file("gr_status", S_IRUGO, l->debugfs,
+                dev, &gk20a_gr_debug_fops);
+        debugfs_create_u32("trace_cmdbuf", S_IRUGO|S_IWUSR,
+                l->debugfs, &gk20a_debug_trace_cmdbuf);
+
+        debugfs_create_u32("ch_wdt_timeout_ms", S_IRUGO|S_IWUSR,
+                l->debugfs, &g->ch_wdt_timeout_ms);
+
+        debugfs_create_u32("disable_syncpoints", S_IRUGO,
+                l->debugfs, &g->disable_syncpoints);
+
+        /* New debug logging API. */
+        debugfs_create_u64("log_mask", S_IRUGO|S_IWUSR,
+                l->debugfs, &g->log_mask);
+        debugfs_create_u32("log_trace", S_IRUGO|S_IWUSR,
+                l->debugfs, &g->log_trace);
+
+        l->debugfs_ltc_enabled =
+                        debugfs_create_bool("ltc_enabled", S_IRUGO|S_IWUSR,
+                                 l->debugfs,
+                                 &g->mm.ltc_enabled_target);
+
+        l->debugfs_gr_idle_timeout_default =
+                        debugfs_create_u32("gr_idle_timeout_default_us",
+                                        S_IRUGO|S_IWUSR, l->debugfs,
+                                         &g->gr_idle_timeout_default);
+        l->debugfs_timeouts_enabled =
+                        debugfs_create_file("timeouts_enabled",
+                                        S_IRUGO|S_IWUSR,
+                                        l->debugfs,
+                                        g,
+                                        &timeouts_enabled_fops);
+
+        l->debugfs_disable_bigpage =
+                        debugfs_create_file("disable_bigpage",
+                                        S_IRUGO|S_IWUSR,
+                                        l->debugfs,
+                                        g,
+                                        &disable_bigpage_fops);
+
+        l->debugfs_timeslice_low_priority_us =
+                        debugfs_create_u32("timeslice_low_priority_us",
+                                        S_IRUGO|S_IWUSR,
+                                        l->debugfs,
+                                        &g->timeslice_low_priority_us);
+        l->debugfs_timeslice_medium_priority_us =
+                        debugfs_create_u32("timeslice_medium_priority_us",
+                                        S_IRUGO|S_IWUSR,
+                                        l->debugfs,
+                                        &g->timeslice_medium_priority_us);
+        l->debugfs_timeslice_high_priority_us =
+                        debugfs_create_u32("timeslice_high_priority_us",
+                                        S_IRUGO|S_IWUSR,
+                                        l->debugfs,
+                                        &g->timeslice_high_priority_us);
+        l->debugfs_runlist_interleave =
+                        debugfs_create_bool("runlist_interleave",
+                                        S_IRUGO|S_IWUSR,
+                                        l->debugfs,
+                                        &g->runlist_interleave);
+        l->debugfs_force_preemption_gfxp =
+                debugfs_create_bool("force_preemption_gfxp", S_IRUGO|S_IWUSR,
+                l->debugfs,
+                &g->gr.ctx_vars.force_preemption_gfxp);
+
+        l->debugfs_force_preemption_cilp =
+                debugfs_create_bool("force_preemption_cilp", S_IRUGO|S_IWUSR,
+                l->debugfs,
+                &g->gr.ctx_vars.force_preemption_cilp);
+
+        l->debugfs_dump_ctxsw_stats =
+                debugfs_create_bool("dump_ctxsw_stats_on_channel_close",
+                        S_IRUGO|S_IWUSR, l->debugfs,
+                        &g->gr.ctx_vars.dump_ctxsw_stats_on_channel_close);
+
+        gr_gk20a_debugfs_init(g);
+        gk20a_pmu_debugfs_init(g);
+        gk20a_railgating_debugfs_init(g);
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        gk20a_cde_debugfs_init(g);
+#endif
+        gk20a_ce_debugfs_init(g);
+        nvgpu_alloc_debugfs_init(g);
+        nvgpu_hal_debugfs_init(g);
+        gk20a_fifo_debugfs_init(g);
+        gk20a_sched_debugfs_init(g);
+#ifdef CONFIG_NVGPU_TRACK_MEM_USAGE
+        nvgpu_kmem_debugfs_init(g);
+#endif
+        nvgpu_ltc_debugfs_init(g);
+        if (g->pci_vendor_id) {
+                nvgpu_xve_debugfs_init(g);
+                nvgpu_bios_debugfs_init(g);
+        }
+}
+
+void gk20a_debug_deinit(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        if (!l->debugfs)
+                return;
+
+        gk20a_fifo_debugfs_deinit(g);
+
+        debugfs_remove_recursive(l->debugfs);
+        debugfs_remove(l->debugfs_alias);
+}
diff --git a/include/os/linux/debug_allocator.c b/include/os/linux/debug_allocator.c
new file mode 100644
index 0000000..d63a903
--- /dev/null
+++ b/include/os/linux/debug_allocator.c
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include "debug_allocator.h"
+#include "os_linux.h"
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#include <nvgpu/allocator.h>
+
+static int __alloc_show(struct seq_file *s, void *unused)
+{
+        struct nvgpu_allocator *a = s->private;
+
+        nvgpu_alloc_print_stats(a, s, 1);
+
+        return 0;
+}
+
+static int __alloc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, __alloc_show, inode->i_private);
+}
+
+static const struct file_operations __alloc_fops = {
+        .open = __alloc_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+void nvgpu_init_alloc_debug(struct gk20a *g, struct nvgpu_allocator *a)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        if (!l->debugfs_allocators)
+                return;
+
+        a->debugfs_entry = debugfs_create_file(a->name, S_IRUGO,
+                                               l->debugfs_allocators,
+                                               a, &__alloc_fops);
+}
+
+void nvgpu_fini_alloc_debug(struct nvgpu_allocator *a)
+{
+}
+
+void nvgpu_alloc_debugfs_init(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        l->debugfs_allocators = debugfs_create_dir("allocators", l->debugfs);
+        if (IS_ERR_OR_NULL(l->debugfs_allocators)) {
+                l->debugfs_allocators = NULL;
+                return;
+        }
+}
diff --git a/include/os/linux/debug_allocator.h b/include/os/linux/debug_allocator.h
new file mode 100644
index 0000000..1b21cfc
--- /dev/null
+++ b/include/os/linux/debug_allocator.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __NVGPU_DEBUG_ALLOCATOR_H__
+#define __NVGPU_DEBUG_ALLOCATOR_H__
+
+struct gk20a;
+void nvgpu_alloc_debugfs_init(struct gk20a *g);
+
+#endif /* __NVGPU_DEBUG_ALLOCATOR_H__ */
diff --git a/include/os/linux/debug_bios.c b/include/os/linux/debug_bios.c
new file mode 100644
index 0000000..f69ccf3
--- /dev/null
+++ b/include/os/linux/debug_bios.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2018 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <nvgpu/types.h>
+
+#include "debug_bios.h"
+#include "os_linux.h"
+
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+
+static int bios_version_show(struct seq_file *s, void *unused)
+{
+        struct gk20a *g = s->private;
+
+        seq_printf(s, "Version %02x.%02x.%02x.%02x.%02x\n",
+                (g->bios.vbios_version >> 24) & 0xFF,
+                (g->bios.vbios_version >> 16) & 0xFF,
+                (g->bios.vbios_version >> 8) & 0xFF,
+                (g->bios.vbios_version >> 0) & 0xFF,
+                (g->bios.vbios_oem_version) & 0xFF);
+
+        return 0;
+}
+
+static int bios_version_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, bios_version_show, inode->i_private);
+}
+
+static const struct file_operations bios_version_fops = {
+        .open = bios_version_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+
+int nvgpu_bios_debugfs_init(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct dentry *gpu_root = l->debugfs;
+
+        debugfs_create_file("bios", S_IRUGO,
+                            gpu_root, g,
+                            &bios_version_fops);
+
+        return 0;
+}
diff --git a/include/os/linux/debug_bios.h b/include/os/linux/debug_bios.h
new file mode 100644
index 0000000..f8e7783
--- /dev/null
+++ b/include/os/linux/debug_bios.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2018 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __NVGPU_DEBUG_BIOS_H__
+#define __NVGPU_DEBUG_BIOS_H__
+
+struct gk20a;
+int nvgpu_bios_debugfs_init(struct gk20a *g);
+
+#endif /* __NVGPU_DEBUG_BIOS_H__ */
diff --git a/include/os/linux/debug_cde.c b/include/os/linux/debug_cde.c
new file mode 100644
index 0000000..f0afa6e
--- /dev/null
+++ b/include/os/linux/debug_cde.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include "debug_cde.h"
+#include "platform_gk20a.h"
+#include "os_linux.h"
+
+#include <linux/debugfs.h>
+
+
+static ssize_t gk20a_cde_reload_write(struct file *file,
+        const char __user *userbuf, size_t count, loff_t *ppos)
+{
+        struct nvgpu_os_linux *l = file->private_data;
+        gk20a_cde_reload(l);
+        return count;
+}
+
+static const struct file_operations gk20a_cde_reload_fops = {
+        .open           = simple_open,
+        .write          = gk20a_cde_reload_write,
+};
+
+void gk20a_cde_debugfs_init(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct gk20a_platform *platform = dev_get_drvdata(dev_from_gk20a(g));
+
+        if (!platform->has_cde)
+                return;
+
+        debugfs_create_u32("cde_parameter", S_IWUSR | S_IRUGO,
+                           l->debugfs, &l->cde_app.shader_parameter);
+        debugfs_create_u32("cde_ctx_count", S_IWUSR | S_IRUGO,
+                           l->debugfs, &l->cde_app.ctx_count);
+        debugfs_create_u32("cde_ctx_usecount", S_IWUSR | S_IRUGO,
+                           l->debugfs, &l->cde_app.ctx_usecount);
+        debugfs_create_u32("cde_ctx_count_top", S_IWUSR | S_IRUGO,
+                           l->debugfs, &l->cde_app.ctx_count_top);
+        debugfs_create_file("reload_cde_firmware", S_IWUSR, l->debugfs,
+                            l, &gk20a_cde_reload_fops);
+}
diff --git a/include/os/linux/debug_cde.h b/include/os/linux/debug_cde.h
new file mode 100644
index 0000000..4895edd
--- /dev/null
+++ b/include/os/linux/debug_cde.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __NVGPU_DEBUG_CDE_H__
+#define __NVGPU_DEBUG_CDE_H__
+
+struct gk20a;
+void gk20a_cde_debugfs_init(struct gk20a *g);
+
+#endif /* __NVGPU_DEBUG_CDE_H__ */
diff --git a/include/os/linux/debug_ce.c b/include/os/linux/debug_ce.c
new file mode 100644
index 0000000..cea0bb4
--- /dev/null
+++ b/include/os/linux/debug_ce.c
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include "debug_ce.h"
+#include "os_linux.h"
+
+#include <linux/debugfs.h>
+
+void gk20a_ce_debugfs_init(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        debugfs_create_u32("ce_app_ctx_count", S_IWUSR | S_IRUGO,
+                           l->debugfs, &g->ce_app.ctx_count);
+        debugfs_create_u32("ce_app_state", S_IWUSR | S_IRUGO,
+                           l->debugfs, &g->ce_app.app_state);
+        debugfs_create_u32("ce_app_next_ctx_id", S_IWUSR | S_IRUGO,
+                           l->debugfs, &g->ce_app.next_ctx_id);
+}
diff --git a/include/os/linux/debug_ce.h b/include/os/linux/debug_ce.h
new file mode 100644
index 0000000..2a8750c
--- /dev/null
+++ b/include/os/linux/debug_ce.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __NVGPU_DEBUG_CE_H__
+#define __NVGPU_DEBUG_CE_H__
+
+struct gk20a;
+void gk20a_ce_debugfs_init(struct gk20a *g);
+
+#endif /* __NVGPU_DEBUG_CE_H__ */
diff --git a/include/os/linux/debug_clk_gm20b.c b/include/os/linux/debug_clk_gm20b.c
new file mode 100644
index 0000000..b8b95fd
--- /dev/null
+++ b/include/os/linux/debug_clk_gm20b.c
@@ -0,0 +1,280 @@
+/*
+ * Copyright (C) 2017-2018 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/uaccess.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#include <nvgpu/io.h>
+#include <nvgpu/clk_arb.h>
+
+#include "gm20b/clk_gm20b.h"
+#include "os_linux.h"
+#include "platform_gk20a.h"
+
+static int rate_get(void *data, u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        struct clk_gk20a *clk = &g->clk;
+
+        *val = (u64)rate_gpc2clk_to_gpu(clk->gpc_pll.freq);
+        return 0;
+}
+static int rate_set(void *data, u64 val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        if (nvgpu_clk_arb_has_active_req(g))
+                return 0;
+        return g->ops.clk.set_rate(g, CTRL_CLK_DOMAIN_GPCCLK, (u32)val);
+}
+DEFINE_SIMPLE_ATTRIBUTE(rate_fops, rate_get, rate_set, "%llu\n");
+
+static int pll_reg_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+        struct nvgpu_clk_pll_debug_data d;
+        u32 reg, m, n, pl, f;
+        int err = 0;
+
+        if (g->ops.clk.get_pll_debug_data) {
+                err = g->ops.clk.get_pll_debug_data(g, &d);
+                if (err)
+                        return err;
+        } else {
+                return -EINVAL;
+        }
+
+        seq_printf(s, "bypassctrl = %s, ",
+                        d.trim_sys_bypassctrl_val ? "bypass" : "vco");
+        seq_printf(s, "sel_vco = %s, ",
+                        d.trim_sys_sel_vco_val ? "vco" : "bypass");
+
+        seq_printf(s, "cfg  = 0x%x : %s : %s : %s\n", d.trim_sys_gpcpll_cfg_val,
+                d.trim_sys_gpcpll_cfg_enabled ? "enabled" : "disabled",
+                d.trim_sys_gpcpll_cfg_locked ? "locked" : "unlocked",
+                d.trim_sys_gpcpll_cfg_sync_on ? "sync_on" : "sync_off");
+
+        reg = d.trim_sys_gpcpll_coeff_val;
+        m = d.trim_sys_gpcpll_coeff_mdiv;
+        n = d.trim_sys_gpcpll_coeff_ndiv;
+        pl = d.trim_sys_gpcpll_coeff_pldiv;
+        f = g->clk.gpc_pll.clk_in * n / (m * nvgpu_pl_to_div(pl));
+        seq_printf(s, "coef = 0x%x : m = %u : n = %u : pl = %u", reg, m, n, pl);
+        seq_printf(s, " : pll_f(gpu_f) = %u(%u) kHz\n", f, f/2);
+
+        seq_printf(s, "dvfs0 = 0x%x : d = %u : dmax = %u : doffs = %u\n",
+                d.trim_sys_gpcpll_dvfs0_val,
+                d.trim_sys_gpcpll_dvfs0_dfs_coeff,
+                d.trim_sys_gpcpll_dvfs0_dfs_det_max,
+                d.trim_sys_gpcpll_dvfs0_dfs_dc_offset);
+
+        return 0;
+}
+
+static int pll_reg_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, pll_reg_show, inode->i_private);
+}
+
+static const struct file_operations pll_reg_fops = {
+        .open           = pll_reg_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int pll_reg_raw_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+        struct nvgpu_clk_pll_debug_data d;
+        u32 reg;
+        int err = 0;
+
+        if (g->ops.clk.get_pll_debug_data) {
+                err = g->ops.clk.get_pll_debug_data(g, &d);
+                if (err)
+                        return err;
+        } else {
+                return -EINVAL;
+        }
+
+        seq_puts(s, "GPCPLL REGISTERS:\n");
+        for (reg = d.trim_sys_gpcpll_cfg_reg;
+             reg < d.trim_sys_gpcpll_dvfs2_reg;
+             reg += sizeof(u32))
+                seq_printf(s, "[0x%02x] = 0x%08x\n", reg, gk20a_readl(g, reg));
+
+        reg = d.trim_bcast_gpcpll_dvfs2_reg;
+        if (reg)
+                seq_printf(s, "[0x%02x] = 0x%08x\n", reg, gk20a_readl(g, reg));
+
+        seq_puts(s, "\nGPC CLK OUT REGISTERS:\n");
+
+        seq_printf(s, "[0x%02x] = 0x%08x\n", d.trim_sys_sel_vco_reg,
+                                             d.trim_sys_sel_vco_val);
+        seq_printf(s, "[0x%02x] = 0x%08x\n", d.trim_sys_gpc2clk_out_reg,
+                                             d.trim_sys_gpc2clk_out_val);
+        seq_printf(s, "[0x%02x] = 0x%08x\n", d.trim_sys_bypassctrl_reg,
+                                             d.trim_sys_bypassctrl_val);
+
+        return 0;
+}
+
+static int pll_reg_raw_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, pll_reg_raw_show, inode->i_private);
+}
+
+static ssize_t pll_reg_raw_write(struct file *file,
+        const char __user *userbuf, size_t count, loff_t *ppos)
+{
+        struct gk20a *g = file->f_path.dentry->d_inode->i_private;
+        char buf[80];
+        u32 reg, val;
+        int err = 0;
+
+        if (sizeof(buf) <= count)
+                return -EINVAL;
+
+        if (copy_from_user(buf, userbuf, count))
+                return -EFAULT;
+
+        /* terminate buffer and trim - white spaces may be appended
+         *  at the end when invoked from shell command line */
+        buf[count] = '\0';
+        strim(buf);
+
+        if (sscanf(buf, "[0x%x] = 0x%x", &reg, &val) != 2)
+                return -EINVAL;
+
+        if (g->ops.clk.pll_reg_write(g, reg, val))
+                err = g->ops.clk.pll_reg_write(g, reg, val);
+        else
+                err = -EINVAL;
+
+        return err;
+}
+
+static const struct file_operations pll_reg_raw_fops = {
+        .open           = pll_reg_raw_open,
+        .read           = seq_read,
+        .write          = pll_reg_raw_write,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int monitor_get(void *data, u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int err = 0;
+
+        if (g->ops.clk.get_gpcclk_clock_counter)
+                err = g->ops.clk.get_gpcclk_clock_counter(&g->clk, val);
+        else
+                err = -EINVAL;
+
+        return err;
+}
+DEFINE_SIMPLE_ATTRIBUTE(monitor_fops, monitor_get, NULL, "%llu\n");
+
+static int voltage_get(void *data, u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int err = 0;
+
+        if (g->ops.clk.get_voltage)
+                err = g->ops.clk.get_voltage(&g->clk, val);
+        else
+                err = -EINVAL;
+
+        return err;
+}
+DEFINE_SIMPLE_ATTRIBUTE(voltage_fops, voltage_get, NULL, "%llu\n");
+
+static int pll_param_show(struct seq_file *s, void *data)
+{
+        struct pll_parms *gpc_pll_params = gm20b_get_gpc_pll_parms();
+
+        seq_printf(s, "ADC offs = %d uV, ADC slope = %d uV, VCO ctrl = 0x%x\n",
+                   gpc_pll_params->uvdet_offs, gpc_pll_params->uvdet_slope,
+                   gpc_pll_params->vco_ctrl);
+        return 0;
+}
+
+static int pll_param_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, pll_param_show, inode->i_private);
+}
+
+static const struct file_operations pll_param_fops = {
+        .open           = pll_param_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+int gm20b_clk_init_debugfs(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct dentry *d;
+
+        if (!l->debugfs)
+                return -EINVAL;
+
+        d = debugfs_create_file(
+                "rate", S_IRUGO|S_IWUSR, l->debugfs, g, &rate_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file(
+                "pll_reg", S_IRUGO, l->debugfs, g, &pll_reg_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file("pll_reg_raw",
+                S_IRUGO, l->debugfs, g, &pll_reg_raw_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file(
+                "monitor", S_IRUGO, l->debugfs, g, &monitor_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file(
+                "voltage", S_IRUGO, l->debugfs, g, &voltage_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file(
+                "pll_param", S_IRUGO, l->debugfs, g, &pll_param_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_u32("pll_na_mode", S_IRUGO, l->debugfs,
+                               (u32 *)&g->clk.gpc_pll.mode);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_u32("fmax2x_at_vmin_safe_t", S_IRUGO,
+                       l->debugfs, (u32 *)&g->clk.dvfs_safe_max_freq);
+        if (!d)
+                goto err_out;
+
+        return 0;
+
+err_out:
+        pr_err("%s: Failed to make debugfs node\n", __func__);
+        return -ENOMEM;
+}
diff --git a/include/os/linux/debug_clk_gm20b.h b/include/os/linux/debug_clk_gm20b.h
new file mode 100644
index 0000000..850ad89
--- /dev/null
+++ b/include/os/linux/debug_clk_gm20b.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __DEBUG_CLK_GM20B_H
+#define __DEBUG_CLK_GM20B_H
+
+#ifdef CONFIG_DEBUG_FS
+int gm20b_clk_init_debugfs(struct gk20a *g);
+#else
+inline int gm20b_clk_init_debugfs(struct gk20a *g)
+{
+        return 0;
+}
+#endif
+
+#endif
diff --git a/include/os/linux/debug_clk_gp106.c b/include/os/linux/debug_clk_gp106.c
new file mode 100644
index 0000000..4900c00
--- /dev/null
+++ b/include/os/linux/debug_clk_gp106.c
@@ -0,0 +1,193 @@
+/*
+ * Copyright (c) 2018, NVIDIA Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/debugfs.h>
+
+#include <nvgpu/clk.h>
+
+#include "os_linux.h"
+
+void nvgpu_clk_arb_pstate_change_lock(struct gk20a *g, bool lock);
+
+static int gp106_get_rate_show(void *data , u64 *val)
+{
+        struct namemap_cfg *c = (struct namemap_cfg *)data;
+        struct gk20a *g = c->g;
+
+        if (!g->ops.clk.get_rate_cntr)
+                return -EINVAL;
+
+        *val = c->is_counter ? (u64)c->scale * g->ops.clk.get_rate_cntr(g, c) :
+                0 /* TODO PLL read */;
+
+        return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(get_rate_fops, gp106_get_rate_show, NULL, "%llu\n");
+
+static int sys_cfc_read(void *data , u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        bool bload = boardobjgrpmask_bitget(
+                &g->clk_pmu.clk_freq_controllers.freq_ctrl_load_mask.super,
+                CTRL_CLK_CLK_FREQ_CONTROLLER_ID_SYS);
+
+        /* val = 1 implies CLFC is loaded or enabled */
+        *val = bload ? 1 : 0;
+        return 0;
+}
+static int sys_cfc_write(void *data , u64 val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int status;
+        /* val = 1 implies load or enable the CLFC */
+        bool bload = val ? true : false;
+
+        nvgpu_clk_arb_pstate_change_lock(g, true);
+        status = clk_pmu_freq_controller_load(g, bload,
+                                        CTRL_CLK_CLK_FREQ_CONTROLLER_ID_SYS);
+        nvgpu_clk_arb_pstate_change_lock(g, false);
+
+        return status;
+}
+DEFINE_SIMPLE_ATTRIBUTE(sys_cfc_fops, sys_cfc_read, sys_cfc_write, "%llu\n");
+
+static int ltc_cfc_read(void *data , u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        bool bload = boardobjgrpmask_bitget(
+                &g->clk_pmu.clk_freq_controllers.freq_ctrl_load_mask.super,
+                CTRL_CLK_CLK_FREQ_CONTROLLER_ID_LTC);
+
+        /* val = 1 implies CLFC is loaded or enabled */
+        *val = bload ? 1 : 0;
+        return 0;
+}
+static int ltc_cfc_write(void *data , u64 val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int status;
+        /* val = 1 implies load or enable the CLFC */
+        bool bload = val ? true : false;
+
+        nvgpu_clk_arb_pstate_change_lock(g, true);
+        status = clk_pmu_freq_controller_load(g, bload,
+                                        CTRL_CLK_CLK_FREQ_CONTROLLER_ID_LTC);
+        nvgpu_clk_arb_pstate_change_lock(g, false);
+
+        return status;
+}
+DEFINE_SIMPLE_ATTRIBUTE(ltc_cfc_fops, ltc_cfc_read, ltc_cfc_write, "%llu\n");
+
+static int xbar_cfc_read(void *data , u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        bool bload = boardobjgrpmask_bitget(
+                &g->clk_pmu.clk_freq_controllers.freq_ctrl_load_mask.super,
+                CTRL_CLK_CLK_FREQ_CONTROLLER_ID_XBAR);
+
+        /* val = 1 implies CLFC is loaded or enabled */
+        *val = bload ? 1 : 0;
+        return 0;
+}
+static int xbar_cfc_write(void *data , u64 val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int status;
+        /* val = 1 implies load or enable the CLFC */
+        bool bload = val ? true : false;
+
+        nvgpu_clk_arb_pstate_change_lock(g, true);
+        status = clk_pmu_freq_controller_load(g, bload,
+                        CTRL_CLK_CLK_FREQ_CONTROLLER_ID_XBAR);
+        nvgpu_clk_arb_pstate_change_lock(g, false);
+
+        return status;
+}
+DEFINE_SIMPLE_ATTRIBUTE(xbar_cfc_fops, xbar_cfc_read,
+                        xbar_cfc_write, "%llu\n");
+
+static int gpc_cfc_read(void *data , u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        bool bload = boardobjgrpmask_bitget(
+                &g->clk_pmu.clk_freq_controllers.freq_ctrl_load_mask.super,
+                CTRL_CLK_CLK_FREQ_CONTROLLER_ID_GPC0);
+
+        /* val = 1 implies CLFC is loaded or enabled */
+        *val = bload ? 1 : 0;
+        return 0;
+}
+static int gpc_cfc_write(void *data , u64 val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int status;
+        /* val = 1 implies load or enable the CLFC */
+        bool bload = val ? true : false;
+
+        nvgpu_clk_arb_pstate_change_lock(g, true);
+        status = clk_pmu_freq_controller_load(g, bload,
+                        CTRL_CLK_CLK_FREQ_CONTROLLER_ID_GPC0);
+        nvgpu_clk_arb_pstate_change_lock(g, false);
+
+        return status;
+}
+DEFINE_SIMPLE_ATTRIBUTE(gpc_cfc_fops, gpc_cfc_read, gpc_cfc_write, "%llu\n");
+
+int gp106_clk_init_debugfs(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct dentry *gpu_root = l->debugfs;
+        struct dentry *clocks_root, *clk_freq_ctlr_root;
+        struct dentry *d;
+        unsigned int i;
+
+        if (NULL == (clocks_root = debugfs_create_dir("clocks", gpu_root)))
+                return -ENOMEM;
+
+        clk_freq_ctlr_root = debugfs_create_dir("clk_freq_ctlr", gpu_root);
+        if (clk_freq_ctlr_root == NULL)
+                return -ENOMEM;
+
+        d = debugfs_create_file("sys", S_IRUGO | S_IWUSR, clk_freq_ctlr_root,
+                                g, &sys_cfc_fops);
+        d = debugfs_create_file("ltc", S_IRUGO | S_IWUSR, clk_freq_ctlr_root,
+                                g, &ltc_cfc_fops);
+        d = debugfs_create_file("xbar", S_IRUGO | S_IWUSR, clk_freq_ctlr_root,
+                                g, &xbar_cfc_fops);
+        d = debugfs_create_file("gpc", S_IRUGO | S_IWUSR, clk_freq_ctlr_root,
+                                g, &gpc_cfc_fops);
+
+        nvgpu_log(g, gpu_dbg_info, "g=%p", g);
+
+        for (i = 0; i < g->clk.namemap_num; i++) {
+                if (g->clk.clk_namemap[i].is_enable) {
+                        d = debugfs_create_file(
+                                g->clk.clk_namemap[i].name,
+                                S_IRUGO,
+                                clocks_root,
+                                &g->clk.clk_namemap[i],
+                                &get_rate_fops);
+                        if (!d)
+                                goto err_out;
+                }
+        }
+        return 0;
+
+err_out:
+        pr_err("%s: Failed to make debugfs node\n", __func__);
+        debugfs_remove_recursive(clocks_root);
+        return -ENOMEM;
+}
diff --git a/include/os/linux/debug_clk_gp106.h b/include/os/linux/debug_clk_gp106.h
new file mode 100644
index 0000000..b1d031d
--- /dev/null
+++ b/include/os/linux/debug_clk_gp106.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __DEBUG_CLK_GP106_H
+#define __DEBUG_CLK_GP106_H
+
+#ifdef CONFIG_DEBUG_FS
+int gp106_clk_init_debugfs(struct gk20a *g);
+#else
+inline int gp106_clk_init_debugfs(struct gk20a *g)
+{
+        return 0;
+}
+#endif
+
+#endif
diff --git a/include/os/linux/debug_clk_gv100.c b/include/os/linux/debug_clk_gv100.c
new file mode 100644
index 0000000..623f2b6
--- /dev/null
+++ b/include/os/linux/debug_clk_gv100.c
@@ -0,0 +1,193 @@
+/*
+ * Copyright (c) 2018, NVIDIA Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/debugfs.h>
+
+#include "gv100/clk_gv100.h"
+
+#include "os_linux.h"
+
+void nvgpu_clk_arb_pstate_change_lock(struct gk20a *g, bool lock);
+
+static int gv100_get_rate_show(void *data , u64 *val)
+{
+        struct namemap_cfg *c = (struct namemap_cfg *)data;
+        struct gk20a *g = c->g;
+
+        if (!g->ops.clk.get_rate_cntr)
+                return -EINVAL;
+
+        *val = c->is_counter ? (u64)c->scale * g->ops.clk.get_rate_cntr(g, c) :
+                0 /* TODO PLL read */;
+
+        return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(get_rate_fops, gv100_get_rate_show, NULL, "%llu\n");
+
+static int sys_cfc_read(void *data , u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        bool bload = boardobjgrpmask_bitget(
+                &g->clk_pmu.clk_freq_controllers.freq_ctrl_load_mask.super,
+                CTRL_CLK_CLK_FREQ_CONTROLLER_ID_SYS);
+
+        /* val = 1 implies CLFC is loaded or enabled */
+        *val = bload ? 1 : 0;
+        return 0;
+}
+static int sys_cfc_write(void *data , u64 val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int status;
+        /* val = 1 implies load or enable the CLFC */
+        bool bload = val ? true : false;
+
+        nvgpu_clk_arb_pstate_change_lock(g, true);
+        status = clk_pmu_freq_controller_load(g, bload,
+                                        CTRL_CLK_CLK_FREQ_CONTROLLER_ID_SYS);
+        nvgpu_clk_arb_pstate_change_lock(g, false);
+
+        return status;
+}
+DEFINE_SIMPLE_ATTRIBUTE(sys_cfc_fops, sys_cfc_read, sys_cfc_write, "%llu\n");
+
+static int ltc_cfc_read(void *data , u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        bool bload = boardobjgrpmask_bitget(
+                &g->clk_pmu.clk_freq_controllers.freq_ctrl_load_mask.super,
+                CTRL_CLK_CLK_FREQ_CONTROLLER_ID_LTC);
+
+        /* val = 1 implies CLFC is loaded or enabled */
+        *val = bload ? 1 : 0;
+        return 0;
+}
+static int ltc_cfc_write(void *data , u64 val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int status;
+        /* val = 1 implies load or enable the CLFC */
+        bool bload = val ? true : false;
+
+        nvgpu_clk_arb_pstate_change_lock(g, true);
+        status = clk_pmu_freq_controller_load(g, bload,
+                                        CTRL_CLK_CLK_FREQ_CONTROLLER_ID_LTC);
+        nvgpu_clk_arb_pstate_change_lock(g, false);
+
+        return status;
+}
+DEFINE_SIMPLE_ATTRIBUTE(ltc_cfc_fops, ltc_cfc_read, ltc_cfc_write, "%llu\n");
+
+static int xbar_cfc_read(void *data , u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        bool bload = boardobjgrpmask_bitget(
+                &g->clk_pmu.clk_freq_controllers.freq_ctrl_load_mask.super,
+                CTRL_CLK_CLK_FREQ_CONTROLLER_ID_XBAR);
+
+        /* val = 1 implies CLFC is loaded or enabled */
+        *val = bload ? 1 : 0;
+        return 0;
+}
+static int xbar_cfc_write(void *data , u64 val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int status;
+        /* val = 1 implies load or enable the CLFC */
+        bool bload = val ? true : false;
+
+        nvgpu_clk_arb_pstate_change_lock(g, true);
+        status = clk_pmu_freq_controller_load(g, bload,
+                        CTRL_CLK_CLK_FREQ_CONTROLLER_ID_XBAR);
+        nvgpu_clk_arb_pstate_change_lock(g, false);
+
+        return status;
+}
+DEFINE_SIMPLE_ATTRIBUTE(xbar_cfc_fops, xbar_cfc_read,
+                        xbar_cfc_write, "%llu\n");
+
+static int gpc_cfc_read(void *data , u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        bool bload = boardobjgrpmask_bitget(
+                &g->clk_pmu.clk_freq_controllers.freq_ctrl_load_mask.super,
+                CTRL_CLK_CLK_FREQ_CONTROLLER_ID_GPC0);
+
+        /* val = 1 implies CLFC is loaded or enabled */
+        *val = bload ? 1 : 0;
+        return 0;
+}
+static int gpc_cfc_write(void *data , u64 val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int status;
+        /* val = 1 implies load or enable the CLFC */
+        bool bload = val ? true : false;
+
+        nvgpu_clk_arb_pstate_change_lock(g, true);
+        status = clk_pmu_freq_controller_load(g, bload,
+                        CTRL_CLK_CLK_FREQ_CONTROLLER_ID_GPC0);
+        nvgpu_clk_arb_pstate_change_lock(g, false);
+
+        return status;
+}
+DEFINE_SIMPLE_ATTRIBUTE(gpc_cfc_fops, gpc_cfc_read, gpc_cfc_write, "%llu\n");
+
+int gv100_clk_init_debugfs(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct dentry *gpu_root = l->debugfs;
+        struct dentry *clocks_root, *clk_freq_ctlr_root;
+        struct dentry *d;
+        unsigned int i;
+
+        if (NULL == (clocks_root = debugfs_create_dir("clocks", gpu_root)))
+                return -ENOMEM;
+
+        clk_freq_ctlr_root = debugfs_create_dir("clk_freq_ctlr", gpu_root);
+        if (clk_freq_ctlr_root == NULL)
+                return -ENOMEM;
+
+        d = debugfs_create_file("sys", S_IRUGO | S_IWUSR, clk_freq_ctlr_root,
+                                g, &sys_cfc_fops);
+        d = debugfs_create_file("ltc", S_IRUGO | S_IWUSR, clk_freq_ctlr_root,
+                                g, &ltc_cfc_fops);
+        d = debugfs_create_file("xbar", S_IRUGO | S_IWUSR, clk_freq_ctlr_root,
+                                g, &xbar_cfc_fops);
+        d = debugfs_create_file("gpc", S_IRUGO | S_IWUSR, clk_freq_ctlr_root,
+                                g, &gpc_cfc_fops);
+
+        nvgpu_log(g, gpu_dbg_info, "g=%p", g);
+
+        for (i = 0; i < g->clk.namemap_num; i++) {
+                if (g->clk.clk_namemap[i].is_enable) {
+                        d = debugfs_create_file(
+                                g->clk.clk_namemap[i].name,
+                                S_IRUGO,
+                                clocks_root,
+                                &g->clk.clk_namemap[i],
+                                &get_rate_fops);
+                        if (!d)
+                                goto err_out;
+                }
+        }
+        return 0;
+
+err_out:
+        pr_err("%s: Failed to make debugfs node\n", __func__);
+        debugfs_remove_recursive(clocks_root);
+        return -ENOMEM;
+}
diff --git a/include/os/linux/debug_clk_gv100.h b/include/os/linux/debug_clk_gv100.h
new file mode 100644
index 0000000..419b4ab
--- /dev/null
+++ b/include/os/linux/debug_clk_gv100.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __DEBUG_CLK_GV100_H
+#define __DEBUG_CLK_GV100_H
+
+#ifdef CONFIG_DEBUG_FS
+int gv100_clk_init_debugfs(struct gk20a *g);
+#else
+static inline int gv100_clk_init_debugfs(struct gk20a *g)
+{
+        return 0;
+}
+#endif
+
+#endif
diff --git a/include/os/linux/debug_fecs_trace.c b/include/os/linux/debug_fecs_trace.c
new file mode 100644
index 0000000..7786053
--- /dev/null
+++ b/include/os/linux/debug_fecs_trace.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright (c) 2018-2020, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/debugfs.h>
+
+#include <nvgpu/fecs_trace.h>
+
+#include "os_linux.h"
+
+/*
+ * The sequence iterator functions.  We simply use the count of the
+ * next line as our internal position.
+ */
+static void *gk20a_fecs_trace_debugfs_ring_seq_start(
+                struct seq_file *s, loff_t *pos)
+{
+        if (*pos >= GK20A_FECS_TRACE_NUM_RECORDS)
+                return NULL;
+
+        return pos;
+}
+
+static void *gk20a_fecs_trace_debugfs_ring_seq_next(
+                struct seq_file *s, void *v, loff_t *pos)
+{
+        ++(*pos);
+        if (*pos >= GK20A_FECS_TRACE_NUM_RECORDS)
+                return NULL;
+        return pos;
+}
+
+static void gk20a_fecs_trace_debugfs_ring_seq_stop(
+                struct seq_file *s, void *v)
+{
+}
+
+static int gk20a_fecs_trace_debugfs_ring_seq_show(
+                struct seq_file *s, void *v)
+{
+        loff_t *pos = (loff_t *) v;
+        struct gk20a *g = *(struct gk20a **)s->private;
+        struct gk20a_fecs_trace_record *r =
+                gk20a_fecs_trace_get_record(g, *pos);
+        int i;
+        const u32 invalid_tag = gk20a_fecs_trace_record_ts_tag_invalid_ts_v();
+        u32 tag;
+        u64 timestamp;
+
+        seq_printf(s, "record #%lld (%p)\n", *pos, r);
+        seq_printf(s, "\tmagic_lo=%08x\n", r->magic_lo);
+        seq_printf(s, "\tmagic_hi=%08x\n", r->magic_hi);
+        if (gk20a_fecs_trace_is_valid_record(r)) {
+                seq_printf(s, "\tcontext_ptr=%08x\n", r->context_ptr);
+                seq_printf(s, "\tcontext_id=%08x\n", r->context_id);
+                seq_printf(s, "\tnew_context_ptr=%08x\n", r->new_context_ptr);
+                seq_printf(s, "\tnew_context_id=%08x\n", r->new_context_id);
+                for (i = 0; i < gk20a_fecs_trace_num_ts(); i++) {
+                        tag = gk20a_fecs_trace_record_ts_tag_v(r->ts[i]);
+                        if (tag == invalid_tag)
+                                continue;
+                        timestamp = gk20a_fecs_trace_record_ts_timestamp_v(r->ts[i]);
+                        timestamp <<= GK20A_FECS_TRACE_PTIMER_SHIFT;
+                        seq_printf(s, "\ttag=%02x timestamp=%012llx\n", tag, timestamp);
+                }
+        }
+        return 0;
+}
+
+/*
+ * Tie them all together into a set of seq_operations.
+ */
+static const struct seq_operations gk20a_fecs_trace_debugfs_ring_seq_ops = {
+        .start = gk20a_fecs_trace_debugfs_ring_seq_start,
+        .next = gk20a_fecs_trace_debugfs_ring_seq_next,
+        .stop = gk20a_fecs_trace_debugfs_ring_seq_stop,
+        .show = gk20a_fecs_trace_debugfs_ring_seq_show
+};
+
+/*
+ * Time to set up the file operations for our /proc file.  In this case,
+ * all we need is an open function which sets up the sequence ops.
+ */
+
+static int gk20a_ctxsw_debugfs_ring_open(struct inode *inode,
+        struct file *file)
+{
+        struct gk20a **p;
+
+        p = __seq_open_private(file, &gk20a_fecs_trace_debugfs_ring_seq_ops,
+                sizeof(struct gk20a *));
+        if (!p)
+                return -ENOMEM;
+
+        *p = (struct gk20a *)inode->i_private;
+        return 0;
+};
+
+/*
+ * The file operations structure contains our open function along with
+ * set of the canned seq_ ops.
+ */
+static const struct file_operations gk20a_fecs_trace_debugfs_ring_fops = {
+        .owner = THIS_MODULE,
+        .open = gk20a_ctxsw_debugfs_ring_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = seq_release_private
+};
+
+static int gk20a_fecs_trace_debugfs_read(void *arg, u64 *val)
+{
+        *val = gk20a_fecs_trace_get_read_index((struct gk20a *)arg);
+        return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(gk20a_fecs_trace_debugfs_read_fops,
+        gk20a_fecs_trace_debugfs_read, NULL, "%llu\n");
+
+static int gk20a_fecs_trace_debugfs_write(void *arg, u64 *val)
+{
+        *val = gk20a_fecs_trace_get_write_index((struct gk20a *)arg);
+        return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(gk20a_fecs_trace_debugfs_write_fops,
+        gk20a_fecs_trace_debugfs_write, NULL, "%llu\n");
+
+int nvgpu_fecs_trace_init_debugfs(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        debugfs_create_file("ctxsw_trace_read", 0600, l->debugfs, g,
+                &gk20a_fecs_trace_debugfs_read_fops);
+        debugfs_create_file("ctxsw_trace_write", 0600, l->debugfs, g,
+                &gk20a_fecs_trace_debugfs_write_fops);
+        debugfs_create_file("ctxsw_trace_ring", 0600, l->debugfs, g,
+                &gk20a_fecs_trace_debugfs_ring_fops);
+
+        return 0;
+}
diff --git a/include/os/linux/debug_fecs_trace.h b/include/os/linux/debug_fecs_trace.h
new file mode 100644
index 0000000..54ebaaf
--- /dev/null
+++ b/include/os/linux/debug_fecs_trace.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LINUX_DEBUG_FECS_TRACE_H
+#define LINUX_DEBUG_FECS_TRACE_H
+
+struct gk20a;
+
+#if defined(CONFIG_DEBUG_FS) && defined(CONFIG_GK20A_CTXSW_TRACE)
+int nvgpu_fecs_trace_init_debugfs(struct gk20a *g);
+#else
+static int nvgpu_fecs_trace_init_debugfs(struct gk20a *g)
+{
+        return 0;
+}
+#endif
+#endif
diff --git a/include/os/linux/debug_fifo.c b/include/os/linux/debug_fifo.c
new file mode 100644
index 0000000..98da8bc
--- /dev/null
+++ b/include/os/linux/debug_fifo.c
@@ -0,0 +1,376 @@
+/*
+ * Copyright (C) 2017-2020 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include "debug_fifo.h"
+#include "os_linux.h"
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#include <nvgpu/sort.h>
+#include <nvgpu/timers.h>
+#include <nvgpu/channel.h>
+
+void __gk20a_fifo_profile_free(struct nvgpu_ref *ref);
+
+static void *gk20a_fifo_sched_debugfs_seq_start(
+                struct seq_file *s, loff_t *pos)
+{
+        struct gk20a *g = s->private;
+        struct fifo_gk20a *f = &g->fifo;
+
+        if (*pos >= f->num_channels)
+                return NULL;
+
+        return &f->channel[*pos];
+}
+
+static void *gk20a_fifo_sched_debugfs_seq_next(
+                struct seq_file *s, void *v, loff_t *pos)
+{
+        struct gk20a *g = s->private;
+        struct fifo_gk20a *f = &g->fifo;
+
+        ++(*pos);
+        if (*pos >= f->num_channels)
+                return NULL;
+
+        return &f->channel[*pos];
+}
+
+static void gk20a_fifo_sched_debugfs_seq_stop(
+                struct seq_file *s, void *v)
+{
+}
+
+static int gk20a_fifo_sched_debugfs_seq_show(
+                struct seq_file *s, void *v)
+{
+        struct gk20a *g = s->private;
+        struct fifo_gk20a *f = &g->fifo;
+        struct channel_gk20a *ch = v;
+        struct tsg_gk20a *tsg = NULL;
+
+        struct fifo_engine_info_gk20a *engine_info;
+        struct fifo_runlist_info_gk20a *runlist;
+        u32 runlist_id;
+        int ret = SEQ_SKIP;
+        u32 engine_id;
+
+        engine_id = gk20a_fifo_get_gr_engine_id(g);
+        engine_info = (f->engine_info + engine_id);
+        runlist_id = engine_info->runlist_id;
+        runlist = &f->runlist_info[runlist_id];
+
+        if (ch == f->channel) {
+                seq_puts(s, "chid     tsgid    pid      timeslice  timeout  interleave graphics_preempt compute_preempt\n");
+                seq_puts(s, "                            (usecs)   (msecs)\n");
+                ret = 0;
+        }
+
+        if (!test_bit(ch->chid, runlist->active_channels))
+                return ret;
+
+        if (gk20a_channel_get(ch)) {
+                tsg = tsg_gk20a_from_ch(ch);
+
+                if (tsg)
+                        seq_printf(s, "%-8d %-8d %-8d %-9d %-8d %-10d %-8d %-8d\n",
+                                ch->chid,
+                                ch->tsgid,
+                                ch->tgid,
+                                tsg->timeslice_us,
+                                ch->timeout_ms_max,
+                                tsg->interleave_level,
+                                tsg->gr_ctx.graphics_preempt_mode,
+                                tsg->gr_ctx.compute_preempt_mode);
+                gk20a_channel_put(ch);
+        }
+        return 0;
+}
+
+static const struct seq_operations gk20a_fifo_sched_debugfs_seq_ops = {
+        .start = gk20a_fifo_sched_debugfs_seq_start,
+        .next = gk20a_fifo_sched_debugfs_seq_next,
+        .stop = gk20a_fifo_sched_debugfs_seq_stop,
+        .show = gk20a_fifo_sched_debugfs_seq_show
+};
+
+static int gk20a_fifo_sched_debugfs_open(struct inode *inode,
+        struct file *file)
+{
+        struct gk20a *g = inode->i_private;
+        int err;
+
+        err = seq_open(file, &gk20a_fifo_sched_debugfs_seq_ops);
+        if (err)
+                return err;
+
+        nvgpu_log(g, gpu_dbg_info, "i_private=%p", inode->i_private);
+
+        ((struct seq_file *)file->private_data)->private = inode->i_private;
+        return 0;
+};
+
+/*
+ * The file operations structure contains our open function along with
+ * set of the canned seq_ ops.
+ */
+static const struct file_operations gk20a_fifo_sched_debugfs_fops = {
+        .owner = THIS_MODULE,
+        .open = gk20a_fifo_sched_debugfs_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = seq_release
+};
+
+static int gk20a_fifo_profile_enable(void *data, u64 val)
+{
+        struct gk20a *g = (struct gk20a *) data;
+        struct fifo_gk20a *f = &g->fifo;
+
+
+        nvgpu_mutex_acquire(&f->profile.lock);
+        if (val == 0) {
+                if (f->profile.enabled) {
+                        f->profile.enabled = false;
+                        nvgpu_ref_put(&f->profile.ref,
+                                __gk20a_fifo_profile_free);
+                }
+        } else {
+                if (!f->profile.enabled) {
+                        /* not kref init as it can have a running condition if
+                         * we enable/disable/enable while kickoff is happening
+                         */
+                        if (!nvgpu_ref_get_unless_zero(&f->profile.ref)) {
+                                f->profile.data = nvgpu_vzalloc(g,
+                                        FIFO_PROFILING_ENTRIES *
+                                        sizeof(struct fifo_profile_gk20a));
+                                f->profile.sorted  = nvgpu_vzalloc(g,
+                                        FIFO_PROFILING_ENTRIES *
+                                        sizeof(u64));
+                                if (!(f->profile.data && f->profile.sorted)) {
+                                        nvgpu_vfree(g, f->profile.data);
+                                        nvgpu_vfree(g, f->profile.sorted);
+                                        nvgpu_mutex_release(&f->profile.lock);
+                                        return -ENOMEM;
+                                }
+                                nvgpu_ref_init(&f->profile.ref);
+                        }
+                        atomic_set(&f->profile.get.atomic_var, 0);
+                        f->profile.enabled = true;
+                }
+        }
+        nvgpu_mutex_release(&f->profile.lock);
+
+        return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(
+        gk20a_fifo_profile_enable_debugfs_fops,
+        NULL,
+        gk20a_fifo_profile_enable,
+        "%llu\n"
+);
+
+static int __profile_cmp(const void *a, const void *b)
+{
+        return *((unsigned long long *) a) - *((unsigned long long *) b);
+}
+
+/*
+ * This uses about 800b in the stack, but the function using it is not part
+ * of a callstack where much memory is being used, so it is fine
+ */
+#define PERCENTILE_WIDTH        5
+#define PERCENTILE_RANGES       (100/PERCENTILE_WIDTH)
+
+static unsigned int __gk20a_fifo_create_stats(struct gk20a *g,
+                u64 *percentiles, u32 index_end, u32 index_start)
+{
+        unsigned int nelem = 0;
+        unsigned int index;
+        struct fifo_profile_gk20a *profile;
+
+        for (index = 0; index < FIFO_PROFILING_ENTRIES; index++) {
+                profile = &g->fifo.profile.data[index];
+
+                if (profile->timestamp[index_end] >
+                                profile->timestamp[index_start]) {
+                        /* This is a valid element */
+                        g->fifo.profile.sorted[nelem] =
+                                                profile->timestamp[index_end] -
+                                                profile->timestamp[index_start];
+                        nelem++;
+                }
+        }
+
+        /* sort it */
+        sort(g->fifo.profile.sorted, nelem, sizeof(unsigned long long),
+                __profile_cmp, NULL);
+
+        /* build ranges */
+        for (index = 0; index < PERCENTILE_RANGES; index++) {
+                percentiles[index] = nelem < PERCENTILE_RANGES ? 0 :
+                        g->fifo.profile.sorted[(PERCENTILE_WIDTH * (index + 1) *
+                                                nelem)/100 - 1];
+        }
+        return nelem;
+}
+
+static int gk20a_fifo_profile_stats(struct seq_file *s, void *unused)
+{
+        struct gk20a *g = s->private;
+        unsigned int get, nelem, index;
+        /*
+         * 800B in the stack, but function is declared statically and only
+         * called from debugfs handler
+         */
+        u64 percentiles_ioctl[PERCENTILE_RANGES];
+        u64 percentiles_kickoff[PERCENTILE_RANGES];
+        u64 percentiles_jobtracking[PERCENTILE_RANGES];
+        u64 percentiles_append[PERCENTILE_RANGES];
+        u64 percentiles_userd[PERCENTILE_RANGES];
+
+        if (!nvgpu_ref_get_unless_zero(&g->fifo.profile.ref)) {
+                seq_printf(s, "Profiling disabled\n");
+                return 0;
+        }
+
+        get = atomic_read(&g->fifo.profile.get.atomic_var);
+
+        __gk20a_fifo_create_stats(g, percentiles_ioctl,
+                PROFILE_IOCTL_EXIT, PROFILE_IOCTL_ENTRY);
+        __gk20a_fifo_create_stats(g, percentiles_kickoff,
+                PROFILE_END, PROFILE_ENTRY);
+        __gk20a_fifo_create_stats(g, percentiles_jobtracking,
+                PROFILE_JOB_TRACKING, PROFILE_IOCTL_ENTRY);
+        __gk20a_fifo_create_stats(g, percentiles_append,
+                PROFILE_APPEND, PROFILE_JOB_TRACKING);
+        nelem = __gk20a_fifo_create_stats(g, percentiles_userd,
+                PROFILE_END, PROFILE_APPEND);
+
+        seq_printf(s, "Number of kickoffs: %d\n", nelem);
+        seq_printf(s, "Perc \t ioctl(ns) \t kickoff(ns) \t pbcopy(ns) \t jobtrack(ns) \t userd(ns)\n");
+
+        for (index = 0; index < PERCENTILE_RANGES; index++)
+                seq_printf(s, "[%2dpc]\t%8lld\t%8lld\t%8lld\t%8lld\t%8lld\n",
+                        PERCENTILE_WIDTH * (index+1),
+                        percentiles_ioctl[index],
+                        percentiles_kickoff[index],
+                        percentiles_append[index],
+                        percentiles_jobtracking[index],
+                        percentiles_userd[index]);
+
+        nvgpu_ref_put(&g->fifo.profile.ref, __gk20a_fifo_profile_free);
+
+        return 0;
+}
+
+static int gk20a_fifo_profile_stats_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, gk20a_fifo_profile_stats, inode->i_private);
+}
+
+static const struct file_operations gk20a_fifo_profile_stats_debugfs_fops = {
+        .open           = gk20a_fifo_profile_stats_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+
+void gk20a_fifo_debugfs_init(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct dentry *gpu_root = l->debugfs;
+        struct dentry *fifo_root;
+        struct dentry *profile_root;
+
+        fifo_root = debugfs_create_dir("fifo", gpu_root);
+        if (IS_ERR_OR_NULL(fifo_root))
+                return;
+
+        nvgpu_log(g, gpu_dbg_info, "g=%p", g);
+
+        debugfs_create_file("sched", 0600, fifo_root, g,
+                &gk20a_fifo_sched_debugfs_fops);
+
+        profile_root = debugfs_create_dir("profile", fifo_root);
+        if (IS_ERR_OR_NULL(profile_root))
+                return;
+
+        nvgpu_mutex_init(&g->fifo.profile.lock);
+        g->fifo.profile.enabled = false;
+        atomic_set(&g->fifo.profile.get.atomic_var, 0);
+        atomic_set(&g->fifo.profile.ref.refcount.atomic_var, 0);
+
+        debugfs_create_file("enable", 0600, profile_root, g,
+                &gk20a_fifo_profile_enable_debugfs_fops);
+
+        debugfs_create_file("stats", 0600, profile_root, g,
+                &gk20a_fifo_profile_stats_debugfs_fops);
+
+}
+
+void gk20a_fifo_profile_snapshot(struct fifo_profile_gk20a *profile, int idx)
+{
+        if (profile)
+                profile->timestamp[idx] = nvgpu_current_time_ns();
+}
+
+void __gk20a_fifo_profile_free(struct nvgpu_ref *ref)
+{
+        struct fifo_gk20a *f = container_of(ref, struct fifo_gk20a,
+                                                profile.ref);
+        nvgpu_vfree(f->g, f->profile.data);
+        nvgpu_vfree(f->g, f->profile.sorted);
+}
+
+/* Get the next element in the ring buffer of profile entries
+ * and grab a reference to the structure
+ */
+struct fifo_profile_gk20a *gk20a_fifo_profile_acquire(struct gk20a *g)
+{
+        struct fifo_gk20a *f = &g->fifo;
+        struct fifo_profile_gk20a *profile;
+        unsigned int index;
+
+        /* If kref is zero, profiling is not enabled */
+        if (!nvgpu_ref_get_unless_zero(&f->profile.ref))
+                return NULL;
+        index = atomic_inc_return(&f->profile.get.atomic_var);
+        profile = &f->profile.data[index % FIFO_PROFILING_ENTRIES];
+
+        return profile;
+}
+
+/* Free the reference to the structure. This allows deferred cleanups */
+void gk20a_fifo_profile_release(struct gk20a *g,
+                                        struct fifo_profile_gk20a *profile)
+{
+        nvgpu_ref_put(&g->fifo.profile.ref, __gk20a_fifo_profile_free);
+}
+
+void gk20a_fifo_debugfs_deinit(struct gk20a *g)
+{
+        struct fifo_gk20a *f = &g->fifo;
+
+        nvgpu_mutex_acquire(&f->profile.lock);
+        if (f->profile.enabled) {
+                f->profile.enabled = false;
+                nvgpu_ref_put(&f->profile.ref, __gk20a_fifo_profile_free);
+        }
+        nvgpu_mutex_release(&f->profile.lock);
+}
diff --git a/include/os/linux/debug_fifo.h b/include/os/linux/debug_fifo.h
new file mode 100644
index 0000000..46ac853
--- /dev/null
+++ b/include/os/linux/debug_fifo.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __NVGPU_DEBUG_FIFO_H__
+#define __NVGPU_DEBUG_FIFO_H__
+
+struct gk20a;
+void gk20a_fifo_debugfs_init(struct gk20a *g);
+void gk20a_fifo_debugfs_deinit(struct gk20a *g);
+
+#endif /* __NVGPU_DEBUG_FIFO_H__ */
diff --git a/include/os/linux/debug_gr.c b/include/os/linux/debug_gr.c
new file mode 100644
index 0000000..d54c6d6
--- /dev/null
+++ b/include/os/linux/debug_gr.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include "debug_gr.h"
+#include "os_linux.h"
+
+#include <linux/debugfs.h>
+
+int gr_gk20a_debugfs_init(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        l->debugfs_gr_default_attrib_cb_size =
+                debugfs_create_u32("gr_default_attrib_cb_size",
+                                   S_IRUGO|S_IWUSR, l->debugfs,
+                                   &g->gr.attrib_cb_default_size);
+
+        return 0;
+}
+
diff --git a/include/os/linux/debug_gr.h b/include/os/linux/debug_gr.h
new file mode 100644
index 0000000..4b46acb
--- /dev/null
+++ b/include/os/linux/debug_gr.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __NVGPU_DEBUG_GR_H__
+#define __NVGPU_DEBUG_GR_H__
+
+struct gk20a;
+int gr_gk20a_debugfs_init(struct gk20a *g);
+
+#endif /* __NVGPU_DEBUG_GR_H__ */
diff --git a/include/os/linux/debug_hal.c b/include/os/linux/debug_hal.c
new file mode 100644
index 0000000..031e335
--- /dev/null
+++ b/include/os/linux/debug_hal.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include "debug_hal.h"
+#include "os_linux.h"
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+/* Format and print a single function pointer to the specified seq_file. */
+static void __hal_print_op(struct seq_file *s, void *op_ptr)
+{
+        seq_printf(s, "%pF\n", op_ptr);
+}
+
+/*
+ * Prints an array of function pointer addresses in op_ptrs to the
+ * specified seq_file
+ */
+static void __hal_print_ops(struct seq_file *s, void **op_ptrs, int num_ops)
+{
+        int i;
+
+        for (i = 0; i < num_ops; i++)
+                __hal_print_op(s, op_ptrs[i]);
+}
+
+/*
+ * Show file operation, which generates content of the file once. Prints a list
+ * of gpu operations as defined by gops and the corresponding function pointer
+ * destination addresses. Relies on no compiler reordering of struct fields and
+ * assumption that all members are function pointers.
+ */
+static int __hal_show(struct seq_file *s, void *unused)
+{
+        struct gpu_ops *gops = s->private;
+
+        __hal_print_ops(s, (void **)gops, sizeof(*gops) / sizeof(void *));
+
+        return 0;
+}
+
+static int __hal_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, __hal_show, inode->i_private);
+}
+
+static const struct file_operations __hal_fops = {
+        .open = __hal_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+void nvgpu_hal_debugfs_fini(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        if (!(l->debugfs_hal == NULL))
+                debugfs_remove_recursive(l->debugfs_hal);
+}
+
+void nvgpu_hal_debugfs_init(struct gk20a *g)
+{
+        struct dentry *d;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        if (!l->debugfs)
+                return;
+        l->debugfs_hal = debugfs_create_dir("hal", l->debugfs);
+        if (IS_ERR_OR_NULL(l->debugfs_hal)) {
+                l->debugfs_hal = NULL;
+                return;
+        }
+
+        /* Pass along reference to the gpu_ops struct as private data */
+        d = debugfs_create_file("gops", S_IRUGO, l->debugfs_hal,
+                &g->ops, &__hal_fops);
+        if (!d) {
+                nvgpu_err(g, "%s: Failed to make debugfs node\n", __func__);
+                debugfs_remove_recursive(l->debugfs_hal);
+                return;
+        }
+}
diff --git a/include/os/linux/debug_hal.h b/include/os/linux/debug_hal.h
new file mode 100644
index 0000000..eee6f23
--- /dev/null
+++ b/include/os/linux/debug_hal.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __NVGPU_DEBUG_HAL_H__
+#define __NVGPU_DEBUG_HAL_H__
+
+struct gk20a;
+void nvgpu_hal_debugfs_fini(struct gk20a *g);
+void nvgpu_hal_debugfs_init(struct gk20a *g);
+
+#endif /* __NVGPU_DEBUG_HAL_H__ */
diff --git a/include/os/linux/debug_kmem.c b/include/os/linux/debug_kmem.c
new file mode 100644
index 0000000..a0c7d47
--- /dev/null
+++ b/include/os/linux/debug_kmem.c
@@ -0,0 +1,312 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#include "os_linux.h"
+#include "debug_kmem.h"
+#include "kmem_priv.h"
+
+/**
+ * to_human_readable_bytes - Determine  suffix for passed size.
+ *
+ * @bytes - Number of bytes to generate a suffix for.
+ * @hr_bytes [out] - The human readable number of bytes.
+ * @hr_suffix [out] - The suffix for the HR number of bytes.
+ *
+ * Computes a human readable decomposition of the passed number of bytes. The
+ * suffix for the bytes is passed back through the @hr_suffix pointer. The right
+ * number of bytes is then passed back in @hr_bytes. This returns the following
+ * ranges:
+ *
+ *   0 - 1023 B
+ *   1 - 1023 KB
+ *   1 - 1023 MB
+ *   1 - 1023 GB
+ *   1 - 1023 TB
+ *   1 - ...  PB
+ */
+static void __to_human_readable_bytes(u64 bytes, u64 *hr_bytes,
+                                      const char **hr_suffix)
+{
+        static const char *suffixes[] =
+                { "B", "KB", "MB", "GB", "TB", "PB" };
+
+        u64 suffix_ind = 0;
+
+        while (suffix_ind < ARRAY_SIZE(suffixes) && bytes >= 1024) {
+                bytes >>= 10;
+                suffix_ind++;
+        }
+
+        /*
+         * Handle case where bytes > 1023PB.
+         */
+        suffix_ind = suffix_ind < ARRAY_SIZE(suffixes) ?
+                suffix_ind : ARRAY_SIZE(suffixes) - 1;
+
+        *hr_bytes = bytes;
+        *hr_suffix = suffixes[suffix_ind];
+}
+
+/**
+ * print_hr_bytes - Print human readable bytes
+ *
+ * @s - A seq_file to print to. May be NULL.
+ * @msg - A message to print before the bytes.
+ * @bytes - Number of bytes.
+ *
+ * Print @msg followed by the human readable decomposition of the passed number
+ * of bytes.
+ *
+ * If @s is NULL then this prints will be made to the kernel log.
+ */
+static void print_hr_bytes(struct seq_file *s, const char *msg, u64 bytes)
+{
+        u64 hr_bytes;
+        const char *hr_suffix;
+
+        __to_human_readable_bytes(bytes, &hr_bytes, &hr_suffix);
+        __pstat(s, "%s%lld %s\n", msg, hr_bytes, hr_suffix);
+}
+
+/**
+ * print_histogram - Build a histogram of the memory usage.
+ *
+ * @tracker The tracking to pull data from.
+ * @s       A seq_file to dump info into.
+ */
+static void print_histogram(struct nvgpu_mem_alloc_tracker *tracker,
+                            struct seq_file *s)
+{
+        int i;
+        u64 pot_min, pot_max;
+        u64 nr_buckets;
+        unsigned int *buckets;
+        unsigned int total_allocs;
+        struct nvgpu_rbtree_node *node;
+        static const char histogram_line[] =
+                "++++++++++++++++++++++++++++++++++++++++";
+
+        /*
+         * pot_min is essentially a round down to the nearest power of 2. This
+         * is the start of the histogram. pot_max is just a round up to the
+         * nearest power of two. Each histogram bucket is one power of two so
+         * the histogram buckets are exponential.
+         */
+        pot_min = (u64)rounddown_pow_of_two(tracker->min_alloc);
+        pot_max = (u64)roundup_pow_of_two(tracker->max_alloc);
+
+        nr_buckets = __ffs(pot_max) - __ffs(pot_min);
+
+        buckets = kzalloc(sizeof(*buckets) * nr_buckets, GFP_KERNEL);
+        if (!buckets) {
+                __pstat(s, "OOM: could not allocate bucket storage!?\n");
+                return;
+        }
+
+        /*
+         * Iterate across all of the allocs and determine what bucket they
+         * should go in. Round the size down to the nearest power of two to
+         * find the right bucket.
+         */
+        nvgpu_rbtree_enum_start(0, &node, tracker->allocs);
+        while (node) {
+                int b;
+                u64 bucket_min;
+                struct nvgpu_mem_alloc *alloc =
+                        nvgpu_mem_alloc_from_rbtree_node(node);
+
+                bucket_min = (u64)rounddown_pow_of_two(alloc->size);
+                if (bucket_min < tracker->min_alloc)
+                        bucket_min = tracker->min_alloc;
+
+                b = __ffs(bucket_min) - __ffs(pot_min);
+
+                /*
+                 * Handle the one case were there's an alloc exactly as big as
+                 * the maximum bucket size of the largest bucket. Most of the
+                 * buckets have an inclusive minimum and exclusive maximum. But
+                 * the largest bucket needs to have an _inclusive_ maximum as
+                 * well.
+                 */
+                if (b == (int)nr_buckets)
+                        b--;
+
+                buckets[b]++;
+
+                nvgpu_rbtree_enum_next(&node, node);
+        }
+
+        total_allocs = 0;
+        for (i = 0; i < (int)nr_buckets; i++)
+                total_allocs += buckets[i];
+
+        __pstat(s, "Alloc histogram:\n");
+
+        /*
+         * Actually compute the histogram lines.
+         */
+        for (i = 0; i < (int)nr_buckets; i++) {
+                char this_line[sizeof(histogram_line) + 1];
+                u64 line_length;
+                u64 hr_bytes;
+                const char *hr_suffix;
+
+                memset(this_line, 0, sizeof(this_line));
+
+                /*
+                 * Compute the normalized line length. Cant use floating point
+                 * so we will just multiply everything by 1000 and use fixed
+                 * point.
+                 */
+                line_length = (1000 * buckets[i]) / total_allocs;
+                line_length *= sizeof(histogram_line);
+                line_length /= 1000;
+
+                memset(this_line, '+', line_length);
+
+                __to_human_readable_bytes(1 << (__ffs(pot_min) + i),
+                                          &hr_bytes, &hr_suffix);
+                __pstat(s, "  [%-4lld %-4lld] %-2s %5u | %s\n",
+                        hr_bytes, hr_bytes << 1,
+                        hr_suffix, buckets[i], this_line);
+        }
+}
+
+/**
+ * nvgpu_kmem_print_stats - Print kmem tracking stats.
+ *
+ * @tracker The tracking to pull data from.
+ * @s       A seq_file to dump info into.
+ *
+ * Print stats from a tracker. If @s is non-null then seq_printf() will be
+ * used with @s. Otherwise the stats are pr_info()ed.
+ */
+void nvgpu_kmem_print_stats(struct nvgpu_mem_alloc_tracker *tracker,
+                            struct seq_file *s)
+{
+        nvgpu_lock_tracker(tracker);
+
+        __pstat(s, "Mem tracker: %s\n\n", tracker->name);
+
+        __pstat(s, "Basic Stats:\n");
+        __pstat(s,        "  Number of allocs        %lld\n",
+                tracker->nr_allocs);
+        __pstat(s,        "  Number of frees         %lld\n",
+                tracker->nr_frees);
+        print_hr_bytes(s, "  Smallest alloc          ", tracker->min_alloc);
+        print_hr_bytes(s, "  Largest alloc           ", tracker->max_alloc);
+        print_hr_bytes(s, "  Bytes allocated         ", tracker->bytes_alloced);
+        print_hr_bytes(s, "  Bytes freed             ", tracker->bytes_freed);
+        print_hr_bytes(s, "  Bytes allocated (real)  ",
+                       tracker->bytes_alloced_real);
+        print_hr_bytes(s, "  Bytes freed (real)      ",
+                       tracker->bytes_freed_real);
+        __pstat(s, "\n");
+
+        print_histogram(tracker, s);
+
+        nvgpu_unlock_tracker(tracker);
+}
+
+static int __kmem_tracking_show(struct seq_file *s, void *unused)
+{
+        struct nvgpu_mem_alloc_tracker *tracker = s->private;
+
+        nvgpu_kmem_print_stats(tracker, s);
+
+        return 0;
+}
+
+static int __kmem_tracking_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, __kmem_tracking_show, inode->i_private);
+}
+
+static const struct file_operations __kmem_tracking_fops = {
+        .open = __kmem_tracking_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+static int __kmem_traces_dump_tracker(struct gk20a *g,
+                                      struct nvgpu_mem_alloc_tracker *tracker,
+                                      struct seq_file *s)
+{
+        struct nvgpu_rbtree_node *node;
+
+        nvgpu_rbtree_enum_start(0, &node, tracker->allocs);
+        while (node) {
+                struct nvgpu_mem_alloc *alloc =
+                        nvgpu_mem_alloc_from_rbtree_node(node);
+
+                kmem_print_mem_alloc(g, alloc, s);
+
+                nvgpu_rbtree_enum_next(&node, node);
+        }
+
+        return 0;
+}
+
+static int __kmem_traces_show(struct seq_file *s, void *unused)
+{
+        struct gk20a *g = s->private;
+
+        nvgpu_lock_tracker(g->vmallocs);
+        seq_puts(s, "Oustanding vmallocs:\n");
+        __kmem_traces_dump_tracker(g, g->vmallocs, s);
+        seq_puts(s, "\n");
+        nvgpu_unlock_tracker(g->vmallocs);
+
+        nvgpu_lock_tracker(g->kmallocs);
+        seq_puts(s, "Oustanding kmallocs:\n");
+        __kmem_traces_dump_tracker(g, g->kmallocs, s);
+        nvgpu_unlock_tracker(g->kmallocs);
+
+        return 0;
+}
+
+static int __kmem_traces_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, __kmem_traces_show, inode->i_private);
+}
+
+static const struct file_operations __kmem_traces_fops = {
+        .open = __kmem_traces_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+void nvgpu_kmem_debugfs_init(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct dentry *node;
+
+        l->debugfs_kmem = debugfs_create_dir("kmem_tracking", l->debugfs);
+        if (IS_ERR_OR_NULL(l->debugfs_kmem))
+                return;
+
+        node = debugfs_create_file(g->vmallocs->name, S_IRUGO,
+                                   l->debugfs_kmem,
+                                   g->vmallocs, &__kmem_tracking_fops);
+        node = debugfs_create_file(g->kmallocs->name, S_IRUGO,
+                                   l->debugfs_kmem,
+                                   g->kmallocs, &__kmem_tracking_fops);
+        node = debugfs_create_file("traces", S_IRUGO,
+                                   l->debugfs_kmem,
+                                   g, &__kmem_traces_fops);
+}
diff --git a/include/os/linux/debug_kmem.h b/include/os/linux/debug_kmem.h
new file mode 100644
index 0000000..44322b5
--- /dev/null
+++ b/include/os/linux/debug_kmem.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __NVGPU_DEBUG_KMEM_H__
+#define __NVGPU_DEBUG_KMEM_H__
+
+struct gk20a;
+#ifdef CONFIG_NVGPU_TRACK_MEM_USAGE
+void nvgpu_kmem_debugfs_init(struct gk20a *g);
+#endif
+
+#endif /* __NVGPU_DEBUG_KMEM_H__ */
diff --git a/include/os/linux/debug_ltc.c b/include/os/linux/debug_ltc.c
new file mode 100644
index 0000000..1b4c221
--- /dev/null
+++ b/include/os/linux/debug_ltc.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2018 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include "debug_ltc.h"
+#include "os_linux.h"
+
+#include <nvgpu/gk20a.h>
+
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+
+static ssize_t ltc_intr_illegal_compstat_read(struct file *file,
+                        char __user *user_buf, size_t count, loff_t *ppos)
+{
+        char buf[3];
+        struct gk20a *g = file->private_data;
+
+        if (g->ltc_intr_en_illegal_compstat)
+                buf[0] = 'Y';
+        else
+                buf[0] = 'N';
+        buf[1] = '\n';
+        buf[2] = 0x00;
+
+        return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+}
+
+static ssize_t ltc_intr_illegal_compstat_write(struct file *file,
+                        const char __user *user_buf, size_t count, loff_t *ppos)
+{
+        char buf[3];
+        int buf_size;
+        bool intr_illegal_compstat_enabled;
+        struct gk20a *g = file->private_data;
+        int err;
+
+        if (!g->ops.ltc.intr_en_illegal_compstat)
+                return -EINVAL;
+
+        buf_size = min(count, (sizeof(buf)-1));
+        if (copy_from_user(buf, user_buf, buf_size))
+                return -EFAULT;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        if (strtobool(buf, &intr_illegal_compstat_enabled) == 0) {
+                g->ops.ltc.intr_en_illegal_compstat(g,
+                                intr_illegal_compstat_enabled);
+                g->ltc_intr_en_illegal_compstat = intr_illegal_compstat_enabled;
+        }
+
+        gk20a_idle(g);
+
+        return buf_size;
+}
+
+static const struct file_operations ltc_intr_illegal_compstat_fops = {
+        .open = simple_open,
+        .read = ltc_intr_illegal_compstat_read,
+        .write = ltc_intr_illegal_compstat_write,
+};
+
+int nvgpu_ltc_debugfs_init(struct gk20a *g)
+{
+        struct dentry *d;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct dentry *gpu_root = l->debugfs;
+
+        l->debugfs_ltc = debugfs_create_dir("ltc", gpu_root);
+        if (IS_ERR_OR_NULL(l->debugfs_ltc))
+                return -ENODEV;
+
+        /* Debug fs node to enable/disable illegal_compstat */
+        d = debugfs_create_file("intr_illegal_compstat_enable", 0600,
+                            l->debugfs_ltc, g,
+                            &ltc_intr_illegal_compstat_fops);
+        if (!d)
+                return -ENOMEM;
+
+        return 0;
+}
diff --git a/include/os/linux/debug_ltc.h b/include/os/linux/debug_ltc.h
new file mode 100644
index 0000000..3ad734c
--- /dev/null
+++ b/include/os/linux/debug_ltc.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2018 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __NVGPU_DEBUG_LTC_H__
+#define __NVGPU_DEBUG_LTC_H__
+
+struct gk20a;
+int nvgpu_ltc_debugfs_init(struct gk20a *g);
+
+#endif /* __NVGPU_DEBUG_LTC_H__ */
diff --git a/include/os/linux/debug_pmgr.c b/include/os/linux/debug_pmgr.c
new file mode 100644
index 0000000..c264978
--- /dev/null
+++ b/include/os/linux/debug_pmgr.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/debugfs.h>
+
+#include "os_linux.h"
+
+#include "pmgr/pmgr.h"
+
+static int pmgr_pwr_devices_get_power_u64(void *data, u64 *p)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int err;
+        u32 val;
+
+        err = pmgr_pwr_devices_get_power(g, &val);
+        *p = val;
+
+        return err;
+}
+
+static int pmgr_pwr_devices_get_current_u64(void *data, u64 *p)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int err;
+        u32 val;
+
+        err = pmgr_pwr_devices_get_current(g, &val);
+        *p = val;
+
+        return err;
+}
+
+static int pmgr_pwr_devices_get_voltage_u64(void *data, u64 *p)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int err;
+        u32 val;
+
+        err = pmgr_pwr_devices_get_voltage(g, &val);
+        *p = val;
+
+        return err;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(
+                pmgr_power_ctrl_fops, pmgr_pwr_devices_get_power_u64, NULL, "%llu\n");
+
+DEFINE_SIMPLE_ATTRIBUTE(
+                pmgr_current_ctrl_fops, pmgr_pwr_devices_get_current_u64, NULL, "%llu\n");
+
+DEFINE_SIMPLE_ATTRIBUTE(
+                pmgr_voltage_ctrl_fops, pmgr_pwr_devices_get_voltage_u64, NULL, "%llu\n");
+
+static void pmgr_debugfs_init(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct dentry *dbgentry;
+
+        dbgentry = debugfs_create_file(
+                                "power", S_IRUGO, l->debugfs, g, &pmgr_power_ctrl_fops);
+        if (!dbgentry)
+                nvgpu_err(g, "debugfs entry create failed for power");
+
+        dbgentry = debugfs_create_file(
+                                "current", S_IRUGO, l->debugfs, g, &pmgr_current_ctrl_fops);
+        if (!dbgentry)
+                nvgpu_err(g, "debugfs entry create failed for current");
+
+        dbgentry = debugfs_create_file(
+                                "voltage", S_IRUGO, l->debugfs, g, &pmgr_voltage_ctrl_fops);
+        if (!dbgentry)
+                nvgpu_err(g, "debugfs entry create failed for voltage");
+}
+
+int nvgpu_pmgr_init_debugfs_linux(struct nvgpu_os_linux *l)
+{
+        struct gk20a *g = &l->g;
+        int ret = 0;
+
+        if (!nvgpu_is_enabled(g, NVGPU_PMU_PSTATE))
+                return ret;
+
+        if (!g->ops.clk.support_pmgr_domain)
+                return ret;
+
+        pmgr_debugfs_init(g);
+
+        return ret;
+}
+
diff --git a/include/os/linux/debug_pmgr.h b/include/os/linux/debug_pmgr.h
new file mode 100644
index 0000000..bd6c556
--- /dev/null
+++ b/include/os/linux/debug_pmgr.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __LINUX_DEBUG_PMGR_H
+#define __LINUX_DEBUG_PMGR_H
+
+#ifdef CONFIG_DEBUG_FS
+int nvgpu_pmgr_init_debugfs_linux(struct nvgpu_os_linux *l);
+#else
+int nvgpu_pmgr_init_debugfs_linux(struct nvgpu_os_linux *l)
+{
+        return 0;
+}
+#endif
+#endif
diff --git a/include/os/linux/debug_pmu.c b/include/os/linux/debug_pmu.c
new file mode 100644
index 0000000..f3e36d0
--- /dev/null
+++ b/include/os/linux/debug_pmu.c
@@ -0,0 +1,484 @@
+/*
+ * Copyright (C) 2017-2019 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <nvgpu/enabled.h>
+#include "debug_pmu.h"
+#include "os_linux.h"
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+
+static int lpwr_debug_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+
+        if (g->ops.pmu.pmu_pg_engines_feature_list &&
+                g->ops.pmu.pmu_pg_engines_feature_list(g,
+                PMU_PG_ELPG_ENGINE_ID_GRAPHICS) !=
+                NVGPU_PMU_GR_FEATURE_MASK_POWER_GATING) {
+                seq_printf(s, "PSTATE: %u\n"
+                        "RPPG Enabled: %u\n"
+                        "RPPG ref count: %u\n"
+                        "RPPG state: %u\n"
+                        "MSCG Enabled: %u\n"
+                        "MSCG pstate state: %u\n"
+                        "MSCG transition state: %u\n",
+                        g->ops.clk_arb.get_current_pstate(g),
+                        g->elpg_enabled, g->pmu.elpg_refcnt,
+                        g->pmu.elpg_stat, g->mscg_enabled,
+                        g->pmu.mscg_stat, g->pmu.mscg_transition_state);
+
+        } else
+                seq_printf(s, "ELPG Enabled: %u\n"
+                        "ELPG ref count: %u\n"
+                        "ELPG state: %u\n",
+                        g->elpg_enabled, g->pmu.elpg_refcnt,
+                        g->pmu.elpg_stat);
+
+        return 0;
+
+}
+
+static int lpwr_debug_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, lpwr_debug_show, inode->i_private);
+}
+
+static const struct file_operations lpwr_debug_fops = {
+        .open           = lpwr_debug_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int mscg_stat_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+        u64 total_ingating, total_ungating, residency, divisor, dividend;
+        struct pmu_pg_stats_data pg_stat_data = { 0 };
+        int err;
+
+        /* Don't unnecessarily power on the device */
+        if (g->power_on) {
+                err = gk20a_busy(g);
+                if (err)
+                        return err;
+
+                nvgpu_pmu_get_pg_stats(g,
+                        PMU_PG_ELPG_ENGINE_ID_MS, &pg_stat_data);
+                gk20a_idle(g);
+        }
+        total_ingating = g->pg_ingating_time_us +
+                        (u64)pg_stat_data.ingating_time;
+        total_ungating = g->pg_ungating_time_us +
+                        (u64)pg_stat_data.ungating_time;
+
+        divisor = total_ingating + total_ungating;
+
+        /* We compute the residency on a scale of 1000 */
+        dividend = total_ingating * 1000;
+
+        if (divisor)
+                residency = div64_u64(dividend, divisor);
+        else
+                residency = 0;
+
+        seq_printf(s,
+                        "Time in MSCG: %llu us\n"
+                        "Time out of MSCG: %llu us\n"
+                        "MSCG residency ratio: %llu\n"
+                        "MSCG Entry Count: %u\n"
+                        "MSCG Avg Entry latency %u\n"
+                        "MSCG Avg Exit latency %u\n",
+                        total_ingating, total_ungating,
+                        residency, pg_stat_data.gating_cnt,
+                        pg_stat_data.avg_entry_latency_us,
+                        pg_stat_data.avg_exit_latency_us);
+        return 0;
+
+}
+
+static int mscg_stat_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, mscg_stat_show, inode->i_private);
+}
+
+static const struct file_operations mscg_stat_fops = {
+        .open           = mscg_stat_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int mscg_transitions_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+        struct pmu_pg_stats_data pg_stat_data = { 0 };
+        u32 total_gating_cnt;
+        int err;
+
+        if (g->power_on) {
+                err = gk20a_busy(g);
+                if (err)
+                        return err;
+
+                nvgpu_pmu_get_pg_stats(g,
+                        PMU_PG_ELPG_ENGINE_ID_MS, &pg_stat_data);
+                gk20a_idle(g);
+        }
+        total_gating_cnt = g->pg_gating_cnt + pg_stat_data.gating_cnt;
+
+        seq_printf(s, "%u\n", total_gating_cnt);
+        return 0;
+
+}
+
+static int mscg_transitions_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, mscg_transitions_show, inode->i_private);
+}
+
+static const struct file_operations mscg_transitions_fops = {
+        .open           = mscg_transitions_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int elpg_stat_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+        struct pmu_pg_stats_data pg_stat_data = { 0 };
+        u64 total_ingating, total_ungating, residency, divisor, dividend;
+        int err;
+
+        /* Don't unnecessarily power on the device */
+        if (g->power_on) {
+                err = gk20a_busy(g);
+                if (err)
+                        return err;
+
+                nvgpu_pmu_get_pg_stats(g,
+                        PMU_PG_ELPG_ENGINE_ID_GRAPHICS, &pg_stat_data);
+                gk20a_idle(g);
+        }
+        total_ingating = g->pg_ingating_time_us +
+                        (u64)pg_stat_data.ingating_time;
+        total_ungating = g->pg_ungating_time_us +
+                        (u64)pg_stat_data.ungating_time;
+        divisor = total_ingating + total_ungating;
+
+        /* We compute the residency on a scale of 1000 */
+        dividend = total_ingating * 1000;
+
+        if (divisor)
+                residency = div64_u64(dividend, divisor);
+        else
+                residency = 0;
+
+        seq_printf(s,
+                        "Time in ELPG: %llu us\n"
+                        "Time out of ELPG: %llu us\n"
+                        "ELPG residency ratio: %llu\n"
+                        "ELPG Entry Count: %u\n"
+                        "ELPG Avg Entry latency %u us\n"
+                        "ELPG Avg Exit latency %u us\n",
+                        total_ingating, total_ungating,
+                        residency, pg_stat_data.gating_cnt,
+                        pg_stat_data.avg_entry_latency_us,
+                        pg_stat_data.avg_exit_latency_us);
+        return 0;
+
+}
+
+static int elpg_stat_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, elpg_stat_show, inode->i_private);
+}
+
+static const struct file_operations elpg_stat_fops = {
+        .open           = elpg_stat_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int elpg_transitions_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+        struct pmu_pg_stats_data pg_stat_data = { 0 };
+        u32 total_gating_cnt;
+        int err;
+
+        if (g->power_on) {
+                err = gk20a_busy(g);
+                if (err)
+                        return err;
+
+                nvgpu_pmu_get_pg_stats(g,
+                        PMU_PG_ELPG_ENGINE_ID_GRAPHICS, &pg_stat_data);
+                gk20a_idle(g);
+        }
+        total_gating_cnt = g->pg_gating_cnt + pg_stat_data.gating_cnt;
+
+        seq_printf(s, "%u\n", total_gating_cnt);
+        return 0;
+
+}
+
+static int elpg_transitions_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, elpg_transitions_show, inode->i_private);
+}
+
+static const struct file_operations elpg_transitions_fops = {
+        .open           = elpg_transitions_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int falc_trace_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+        struct nvgpu_pmu *pmu = &g->pmu;
+        u32 i = 0, j = 0, k, l, m;
+        char part_str[40];
+        void *tracebuffer;
+        char *trace;
+        u32 *trace1;
+
+        /* allocate system memory to copy pmu trace buffer */
+        tracebuffer = nvgpu_kzalloc(g, GK20A_PMU_TRACE_BUFSIZE);
+        if (tracebuffer == NULL)
+                return -ENOMEM;
+
+        /* read pmu traces into system memory buffer */
+        nvgpu_mem_rd_n(g, &pmu->trace_buf,
+                       0, tracebuffer, GK20A_PMU_TRACE_BUFSIZE);
+
+        trace = (char *)tracebuffer;
+        trace1 = (u32 *)tracebuffer;
+
+        for (i = 0; i < GK20A_PMU_TRACE_BUFSIZE; i += 0x40) {
+                for (j = 0; j < 0x40; j++)
+                        if (trace1[(i / 4) + j])
+                                break;
+                if (j == 0x40)
+                        break;
+                seq_printf(s, "Index %x: ", trace1[(i / 4)]);
+                l = 0;
+                m = 0;
+                while (nvgpu_find_hex_in_string((trace+i+20+m), g, &k)) {
+                        if (k >= 40)
+                                break;
+                        strncpy(part_str, (trace+i+20+m), k);
+                        part_str[k] = 0;
+                        seq_printf(s, "%s0x%x", part_str,
+                                        trace1[(i / 4) + 1 + l]);
+                        l++;
+                        m += k + 2;
+                }
+                seq_printf(s, "%s", (trace+i+20+m));
+        }
+
+        nvgpu_kfree(g, tracebuffer);
+        return 0;
+}
+
+static int falc_trace_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, falc_trace_show, inode->i_private);
+}
+
+static const struct file_operations falc_trace_fops = {
+        .open           = falc_trace_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int perfmon_events_enable_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+
+        seq_printf(s, "%u\n", g->pmu.perfmon_sampling_enabled ? 1 : 0);
+        return 0;
+
+}
+
+static int perfmon_events_enable_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, perfmon_events_enable_show, inode->i_private);
+}
+
+static ssize_t perfmon_events_enable_write(struct file *file,
+        const char __user *userbuf, size_t count, loff_t *ppos)
+{
+        struct seq_file *s = file->private_data;
+        struct gk20a *g = s->private;
+        unsigned long val = 0;
+        char buf[40];
+        int buf_size;
+        int err;
+
+        memset(buf, 0, sizeof(buf));
+        buf_size = min(count, (sizeof(buf)-1));
+
+        if (copy_from_user(buf, userbuf, buf_size))
+                return -EFAULT;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        /* Don't turn on gk20a unnecessarily */
+        if (g->power_on) {
+                err = gk20a_busy(g);
+                if (err)
+                        return err;
+
+                if (val && !g->pmu.perfmon_sampling_enabled &&
+                                nvgpu_is_enabled(g, NVGPU_PMU_PERFMON)) {
+                        g->pmu.perfmon_sampling_enabled = true;
+                        g->ops.pmu.pmu_perfmon_start_sampling(&(g->pmu));
+                } else if (!val && g->pmu.perfmon_sampling_enabled &&
+                                nvgpu_is_enabled(g, NVGPU_PMU_PERFMON)) {
+                        g->pmu.perfmon_sampling_enabled = false;
+                        g->ops.pmu.pmu_perfmon_stop_sampling(&(g->pmu));
+                }
+                gk20a_idle(g);
+        } else {
+                g->pmu.perfmon_sampling_enabled = val ? true : false;
+        }
+
+        return count;
+}
+
+static const struct file_operations perfmon_events_enable_fops = {
+        .open           = perfmon_events_enable_open,
+        .read           = seq_read,
+        .write          = perfmon_events_enable_write,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int perfmon_events_count_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+
+        seq_printf(s, "%lu\n", g->pmu.perfmon_events_cnt);
+        return 0;
+
+}
+
+static int perfmon_events_count_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, perfmon_events_count_show, inode->i_private);
+}
+
+static const struct file_operations perfmon_events_count_fops = {
+        .open           = perfmon_events_count_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int security_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+
+        seq_printf(s, "%d\n", g->pmu.pmu_mode);
+        return 0;
+
+}
+
+static int security_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, security_show, inode->i_private);
+}
+
+static const struct file_operations security_fops = {
+        .open           = security_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+int gk20a_pmu_debugfs_init(struct gk20a *g)
+{
+        struct dentry *d;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        d = debugfs_create_file(
+                "lpwr_debug", S_IRUGO|S_IWUSR, l->debugfs, g,
+                                                &lpwr_debug_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file(
+                "mscg_residency", S_IRUGO|S_IWUSR, l->debugfs, g,
+                                                &mscg_stat_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file(
+                "mscg_transitions", S_IRUGO, l->debugfs, g,
+                                                &mscg_transitions_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file(
+                "elpg_residency", S_IRUGO|S_IWUSR, l->debugfs, g,
+                                                &elpg_stat_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file(
+                "elpg_transitions", S_IRUGO, l->debugfs, g,
+                                                &elpg_transitions_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file(
+                "pmu_security", S_IRUGO, l->debugfs, g,
+                                                &security_fops);
+        if (!d)
+                goto err_out;
+
+        /* No access to PMU if virtual */
+        if (!g->is_virtual) {
+                d = debugfs_create_file(
+                        "falc_trace", S_IRUGO, l->debugfs, g,
+                                                &falc_trace_fops);
+                if (!d)
+                        goto err_out;
+
+                d = debugfs_create_file(
+                        "perfmon_events_enable", S_IRUGO, l->debugfs, g,
+                                                &perfmon_events_enable_fops);
+                if (!d)
+                        goto err_out;
+
+                d = debugfs_create_file(
+                        "perfmon_events_count", S_IRUGO, l->debugfs, g,
+                                                &perfmon_events_count_fops);
+                if (!d)
+                        goto err_out;
+        }
+        return 0;
+err_out:
+        pr_err("%s: Failed to make debugfs node\n", __func__);
+        return -ENOMEM;
+}
diff --git a/include/os/linux/debug_pmu.h b/include/os/linux/debug_pmu.h
new file mode 100644
index 0000000..c4e3243
--- /dev/null
+++ b/include/os/linux/debug_pmu.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __NVGPU_DEBUG_PMU_H__
+#define __NVGPU_DEBUG_PMU_H__
+
+struct gk20a;
+int gk20a_pmu_debugfs_init(struct gk20a *g);
+
+#endif /* __NVGPU_DEBUG_PMU_H__ */
diff --git a/include/os/linux/debug_sched.c b/include/os/linux/debug_sched.c
new file mode 100644
index 0000000..fa43dc4
--- /dev/null
+++ b/include/os/linux/debug_sched.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2017-2020 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include "debug_sched.h"
+#include "os_linux.h"
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+static int gk20a_sched_debugfs_show(struct seq_file *s, void *unused)
+{
+        struct gk20a *g = s->private;
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+        bool sched_busy = true;
+
+        int n = sched->bitmap_size / sizeof(u64);
+        int i;
+        int err;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        if (nvgpu_mutex_tryacquire(&sched->busy_lock)) {
+                sched_busy = false;
+                nvgpu_mutex_release(&sched->busy_lock);
+        }
+
+        seq_printf(s, "control_locked=%d\n", sched->control_locked);
+        seq_printf(s, "busy=%d\n", sched_busy);
+        seq_printf(s, "bitmap_size=%zu\n", sched->bitmap_size);
+
+        nvgpu_mutex_acquire(&sched->status_lock);
+
+        seq_puts(s, "active_tsg_bitmap\n");
+        for (i = 0; i < n; i++)
+                seq_printf(s, "\t0x%016llx\n", sched->active_tsg_bitmap[i]);
+
+        seq_puts(s, "recent_tsg_bitmap\n");
+        for (i = 0; i < n; i++)
+                seq_printf(s, "\t0x%016llx\n", sched->recent_tsg_bitmap[i]);
+
+        nvgpu_mutex_release(&sched->status_lock);
+
+        gk20a_idle(g);
+
+        return 0;
+}
+
+static int gk20a_sched_debugfs_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, gk20a_sched_debugfs_show, inode->i_private);
+}
+
+static const struct file_operations gk20a_sched_debugfs_fops = {
+        .open           = gk20a_sched_debugfs_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+void gk20a_sched_debugfs_init(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        debugfs_create_file("sched_ctrl", S_IRUGO, l->debugfs,
+                        g, &gk20a_sched_debugfs_fops);
+}
diff --git a/include/os/linux/debug_sched.h b/include/os/linux/debug_sched.h
new file mode 100644
index 0000000..34a8f55
--- /dev/null
+++ b/include/os/linux/debug_sched.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __NVGPU_DEBUG_SCHED_H__
+#define __NVGPU_DEBUG_SCHED_H__
+
+struct gk20a;
+void gk20a_sched_debugfs_init(struct gk20a *g);
+
+#endif /* __NVGPU_DEBUG_SCHED_H__ */
diff --git a/include/os/linux/debug_therm_gp106.c b/include/os/linux/debug_therm_gp106.c
new file mode 100644
index 0000000..dfe3946
--- /dev/null
+++ b/include/os/linux/debug_therm_gp106.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2018, NVIDIA Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/debugfs.h>
+
+#include "os_linux.h"
+
+static int therm_get_internal_sensor_curr_temp(void *data, u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        u32 readval;
+        int err;
+
+        if (!g->ops.therm.get_internal_sensor_curr_temp)
+                return -EINVAL;
+
+        err = g->ops.therm.get_internal_sensor_curr_temp(g, &readval);
+        if (!err)
+                *val = readval;
+
+        return err;
+}
+DEFINE_SIMPLE_ATTRIBUTE(therm_ctrl_fops, therm_get_internal_sensor_curr_temp, NULL, "%llu\n");
+
+int gp106_therm_init_debugfs(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct dentry *dbgentry;
+
+        dbgentry = debugfs_create_file(
+                "temp", S_IRUGO, l->debugfs, g, &therm_ctrl_fops);
+        if (!dbgentry)
+                nvgpu_err(g, "debugfs entry create failed for therm_curr_temp");
+
+        return 0;
+}
diff --git a/include/os/linux/debug_therm_gp106.h b/include/os/linux/debug_therm_gp106.h
new file mode 100644
index 0000000..3e9380d
--- /dev/null
+++ b/include/os/linux/debug_therm_gp106.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __DEBUG_THERM_GP106_H
+#define __DEBUG_THERM_GP106_H
+
+#ifdef CONFIG_DEBUG_FS
+int gp106_therm_init_debugfs(struct gk20a *g);
+#else
+static inline int gp106_therm_init_debugfs(struct gk20a *g)
+{
+        return 0;
+}
+#endif
+
+#endif
diff --git a/include/os/linux/debug_xve.c b/include/os/linux/debug_xve.c
new file mode 100644
index 0000000..128d316
--- /dev/null
+++ b/include/os/linux/debug_xve.c
@@ -0,0 +1,177 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <nvgpu/types.h>
+#include <nvgpu/xve.h>
+#include <nvgpu/timers.h>
+
+#include "debug_xve.h"
+#include "os_linux.h"
+
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+
+static ssize_t xve_link_speed_write(struct file *filp,
+                                    const char __user *buff,
+                                    size_t len, loff_t *off)
+{
+        struct gk20a *g = ((struct seq_file *)filp->private_data)->private;
+        char kbuff[16];
+        u32 buff_size, check_len;
+        u32 link_speed = 0;
+        int ret;
+
+        buff_size = min_t(size_t, 16, len);
+
+        memset(kbuff, 0, 16);
+        if (copy_from_user(kbuff, buff, buff_size))
+                return -EFAULT;
+
+        check_len = strlen("Gen1");
+        if (strncmp(kbuff, "Gen1", check_len) == 0)
+                link_speed = GPU_XVE_SPEED_2P5;
+        else if (strncmp(kbuff, "Gen2", check_len) == 0)
+                link_speed = GPU_XVE_SPEED_5P0;
+        else if (strncmp(kbuff, "Gen3", check_len) == 0)
+                link_speed = GPU_XVE_SPEED_8P0;
+        else
+                nvgpu_err(g, "%s: Unknown PCIe speed: %s",
+                          __func__, kbuff);
+
+        if (!link_speed)
+                return -EINVAL;
+
+        /* Brief pause... To help rate limit this. */
+        nvgpu_msleep(250);
+
+        /*
+         * And actually set the speed. Yay.
+         */
+        ret = g->ops.xve.set_speed(g, link_speed);
+        if (ret)
+                return ret;
+
+        return len;
+}
+
+static int xve_link_speed_show(struct seq_file *s, void *unused)
+{
+        struct gk20a *g = s->private;
+        u32 speed;
+        int err;
+
+        err = g->ops.xve.get_speed(g, &speed);
+        if (err)
+                return err;
+
+        seq_printf(s, "Current PCIe speed:\n  %s\n", xve_speed_to_str(speed));
+
+        return 0;
+}
+
+static int xve_link_speed_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, xve_link_speed_show, inode->i_private);
+}
+
+static const struct file_operations xve_link_speed_fops = {
+        .open = xve_link_speed_open,
+        .read = seq_read,
+        .write = xve_link_speed_write,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+static int xve_available_speeds_show(struct seq_file *s, void *unused)
+{
+        struct gk20a *g = s->private;
+        u32 available_speeds;
+
+        g->ops.xve.available_speeds(g, &available_speeds);
+
+        seq_puts(s, "Available PCIe bus speeds:\n");
+        if (available_speeds & GPU_XVE_SPEED_2P5)
+                seq_puts(s, "  Gen1\n");
+        if (available_speeds & GPU_XVE_SPEED_5P0)
+                seq_puts(s, "  Gen2\n");
+        if (available_speeds & GPU_XVE_SPEED_8P0)
+                seq_puts(s, "  Gen3\n");
+
+        return 0;
+}
+
+static int xve_available_speeds_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, xve_available_speeds_show, inode->i_private);
+}
+
+static const struct file_operations xve_available_speeds_fops = {
+        .open = xve_available_speeds_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+static int xve_link_control_status_show(struct seq_file *s, void *unused)
+{
+        struct gk20a *g = s->private;
+        u32 link_status;
+
+        link_status = g->ops.xve.get_link_control_status(g);
+        seq_printf(s, "0x%08x\n", link_status);
+
+        return 0;
+}
+
+static int xve_link_control_status_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, xve_link_control_status_show, inode->i_private);
+}
+
+static const struct file_operations xve_link_control_status_fops = {
+        .open = xve_link_control_status_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+int nvgpu_xve_debugfs_init(struct gk20a *g)
+{
+        int err = -ENODEV;
+
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct dentry *gpu_root = l->debugfs;
+
+        l->debugfs_xve = debugfs_create_dir("xve", gpu_root);
+        if (IS_ERR_OR_NULL(l->debugfs_xve))
+                goto fail;
+
+        /*
+         * These are just debug nodes. If they fail to get made it's not worth
+         * worrying the higher level SW.
+         */
+        debugfs_create_file("link_speed", S_IRUGO,
+                            l->debugfs_xve, g,
+                            &xve_link_speed_fops);
+        debugfs_create_file("available_speeds", S_IRUGO,
+                            l->debugfs_xve, g,
+                            &xve_available_speeds_fops);
+        debugfs_create_file("link_control_status", S_IRUGO,
+                            l->debugfs_xve, g,
+                            &xve_link_control_status_fops);
+
+        err = 0;
+fail:
+        return err;
+}
diff --git a/include/os/linux/debug_xve.h b/include/os/linux/debug_xve.h
new file mode 100644
index 0000000..f3b1ac5
--- /dev/null
+++ b/include/os/linux/debug_xve.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __NVGPU_DEBUG_XVE_H__
+#define __NVGPU_DEBUG_XVE_H__
+
+struct gk20a;
+int nvgpu_xve_debugfs_init(struct gk20a *g);
+
+#endif /* __NVGPU_DEBUG_SVE_H__ */
diff --git a/include/os/linux/dmabuf.c b/include/os/linux/dmabuf.c
new file mode 100644
index 0000000..e8e3313
--- /dev/null
+++ b/include/os/linux/dmabuf.c
@@ -0,0 +1,219 @@
+/*
+* Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/device.h>
+#include <linux/dma-buf.h>
+#include <linux/scatterlist.h>
+
+#include <nvgpu/comptags.h>
+#include <nvgpu/enabled.h>
+#include <nvgpu/gk20a.h>
+
+#include <nvgpu/linux/vm.h>
+
+#include "gk20a/fence_gk20a.h"
+
+#include "platform_gk20a.h"
+#include "dmabuf.h"
+#include "os_linux.h"
+#include "dmabuf_vidmem.h"
+
+static void gk20a_mm_delete_priv(void *_priv)
+{
+        struct gk20a_buffer_state *s, *s_tmp;
+        struct gk20a_dmabuf_priv *priv = _priv;
+        struct gk20a *g;
+
+        if (!priv)
+                return;
+
+        g = priv->g;
+
+        if (priv->comptags.allocated && priv->comptags.lines) {
+                BUG_ON(!priv->comptag_allocator);
+                gk20a_comptaglines_free(priv->comptag_allocator,
+                                priv->comptags.offset,
+                                priv->comptags.lines);
+        }
+
+        /* Free buffer states */
+        nvgpu_list_for_each_entry_safe(s, s_tmp, &priv->states,
+                                gk20a_buffer_state, list) {
+                gk20a_fence_put(s->fence);
+                nvgpu_list_del(&s->list);
+                nvgpu_kfree(g, s);
+        }
+
+        nvgpu_kfree(g, priv);
+}
+
+enum nvgpu_aperture gk20a_dmabuf_aperture(struct gk20a *g,
+                                          struct dma_buf *dmabuf)
+{
+        struct gk20a *buf_owner = nvgpu_vidmem_buf_owner(dmabuf);
+        bool unified_memory = nvgpu_is_enabled(g, NVGPU_MM_UNIFIED_MEMORY);
+
+        if (buf_owner == NULL) {
+                /* Not nvgpu-allocated, assume system memory */
+                return APERTURE_SYSMEM;
+        } else if (WARN_ON(buf_owner == g && unified_memory)) {
+                /* Looks like our video memory, but this gpu doesn't support
+                 * it. Warn about a bug and bail out */
+                nvgpu_warn(g,
+                        "dmabuf is our vidmem but we don't have local vidmem");
+                return APERTURE_INVALID;
+        } else if (buf_owner != g) {
+                /* Someone else's vidmem */
+                return APERTURE_INVALID;
+        } else {
+                /* Yay, buf_owner == g */
+                return APERTURE_VIDMEM;
+        }
+}
+
+struct sg_table *gk20a_mm_pin(struct device *dev, struct dma_buf *dmabuf,
+                              struct dma_buf_attachment **attachment)
+{
+        struct gk20a_dmabuf_priv *priv;
+
+        priv = dma_buf_get_drvdata(dmabuf, dev);
+        if (WARN_ON(!priv))
+                return ERR_PTR(-EINVAL);
+
+        nvgpu_mutex_acquire(&priv->lock);
+
+        if (priv->pin_count == 0) {
+                priv->attach = dma_buf_attach(dmabuf, dev);
+                if (IS_ERR(priv->attach)) {
+                        nvgpu_mutex_release(&priv->lock);
+                        return (struct sg_table *)priv->attach;
+                }
+
+                priv->sgt = dma_buf_map_attachment(priv->attach,
+                                                   DMA_BIDIRECTIONAL);
+                if (IS_ERR(priv->sgt)) {
+                        dma_buf_detach(dmabuf, priv->attach);
+                        nvgpu_mutex_release(&priv->lock);
+                        return priv->sgt;
+                }
+        }
+
+        priv->pin_count++;
+        nvgpu_mutex_release(&priv->lock);
+        *attachment = priv->attach;
+        return priv->sgt;
+}
+
+void gk20a_mm_unpin(struct device *dev, struct dma_buf *dmabuf,
+                    struct dma_buf_attachment *attachment,
+                    struct sg_table *sgt)
+{
+        struct gk20a_dmabuf_priv *priv = dma_buf_get_drvdata(dmabuf, dev);
+        dma_addr_t dma_addr;
+
+        if (IS_ERR(priv) || !priv)
+                return;
+
+        nvgpu_mutex_acquire(&priv->lock);
+        WARN_ON(priv->sgt != sgt);
+        WARN_ON(priv->attach != attachment);
+        priv->pin_count--;
+        WARN_ON(priv->pin_count < 0);
+        dma_addr = sg_dma_address(priv->sgt->sgl);
+        if (priv->pin_count == 0) {
+                dma_buf_unmap_attachment(priv->attach, priv->sgt,
+                                         DMA_BIDIRECTIONAL);
+                dma_buf_detach(dmabuf, priv->attach);
+        }
+        nvgpu_mutex_release(&priv->lock);
+}
+
+int gk20a_dmabuf_alloc_drvdata(struct dma_buf *dmabuf, struct device *dev)
+{
+        struct gk20a *g = gk20a_get_platform(dev)->g;
+        struct gk20a_dmabuf_priv *priv;
+
+        priv = dma_buf_get_drvdata(dmabuf, dev);
+        if (likely(priv))
+                return 0;
+
+        nvgpu_mutex_acquire(&g->mm.priv_lock);
+        priv = dma_buf_get_drvdata(dmabuf, dev);
+        if (priv)
+                goto priv_exist_or_err;
+
+        priv = nvgpu_kzalloc(g, sizeof(*priv));
+        if (!priv) {
+                priv = ERR_PTR(-ENOMEM);
+                goto priv_exist_or_err;
+        }
+
+        nvgpu_mutex_init(&priv->lock);
+        nvgpu_init_list_node(&priv->states);
+        priv->g = g;
+        dma_buf_set_drvdata(dmabuf, dev, priv, gk20a_mm_delete_priv);
+
+priv_exist_or_err:
+        nvgpu_mutex_release(&g->mm.priv_lock);
+        if (IS_ERR(priv))
+                return -ENOMEM;
+
+        return 0;
+}
+
+int gk20a_dmabuf_get_state(struct dma_buf *dmabuf, struct gk20a *g,
+                           u64 offset, struct gk20a_buffer_state **state)
+{
+        int err = 0;
+        struct gk20a_dmabuf_priv *priv;
+        struct gk20a_buffer_state *s;
+        struct device *dev = dev_from_gk20a(g);
+
+        if (WARN_ON(offset >= (u64)dmabuf->size))
+                return -EINVAL;
+
+        err = gk20a_dmabuf_alloc_drvdata(dmabuf, dev);
+        if (err)
+                return err;
+
+        priv = dma_buf_get_drvdata(dmabuf, dev);
+        if (WARN_ON(!priv))
+                return -ENOSYS;
+
+        nvgpu_mutex_acquire(&priv->lock);
+
+        nvgpu_list_for_each_entry(s, &priv->states, gk20a_buffer_state, list)
+                if (s->offset == offset)
+                        goto out;
+
+        /* State not found, create state. */
+        s = nvgpu_kzalloc(g, sizeof(*s));
+        if (!s) {
+                err = -ENOMEM;
+                goto out;
+        }
+
+        s->offset = offset;
+        nvgpu_init_list_node(&s->list);
+        nvgpu_mutex_init(&s->lock);
+        nvgpu_list_add_tail(&s->list, &priv->states);
+
+out:
+        nvgpu_mutex_release(&priv->lock);
+        if (!err)
+                *state = s;
+        return err;
+}
diff --git a/include/os/linux/dmabuf.h b/include/os/linux/dmabuf.h
new file mode 100644
index 0000000..8399eaa
--- /dev/null
+++ b/include/os/linux/dmabuf.h
@@ -0,0 +1,62 @@
+/*
+* Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __COMMON_LINUX_DMABUF_H__
+#define __COMMON_LINUX_DMABUF_H__
+
+#include <nvgpu/comptags.h>
+#include <nvgpu/list.h>
+#include <nvgpu/lock.h>
+#include <nvgpu/gmmu.h>
+
+struct sg_table;
+struct dma_buf;
+struct dma_buf_attachment;
+struct device;
+
+struct gk20a;
+struct gk20a_buffer_state;
+
+struct gk20a_dmabuf_priv {
+        struct nvgpu_mutex lock;
+
+        struct gk20a *g;
+
+        struct gk20a_comptag_allocator *comptag_allocator;
+        struct gk20a_comptags comptags;
+
+        struct dma_buf_attachment *attach;
+        struct sg_table *sgt;
+
+        int pin_count;
+
+        struct nvgpu_list_node states;
+
+        u64 buffer_id;
+};
+
+struct sg_table *gk20a_mm_pin(struct device *dev, struct dma_buf *dmabuf,
+                              struct dma_buf_attachment **attachment);
+void gk20a_mm_unpin(struct device *dev, struct dma_buf *dmabuf,
+                    struct dma_buf_attachment *attachment,
+                    struct sg_table *sgt);
+
+int gk20a_dmabuf_alloc_drvdata(struct dma_buf *dmabuf, struct device *dev);
+
+int gk20a_dmabuf_get_state(struct dma_buf *dmabuf, struct gk20a *g,
+                           u64 offset, struct gk20a_buffer_state **state);
+
+#endif
diff --git a/include/os/linux/dmabuf_vidmem.c b/include/os/linux/dmabuf_vidmem.c
new file mode 100644
index 0000000..bada5dc
--- /dev/null
+++ b/include/os/linux/dmabuf_vidmem.c
@@ -0,0 +1,269 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/dma-buf.h>
+#include <linux/version.h>
+#include <uapi/linux/nvgpu.h>
+
+#ifdef CONFIG_NVGPU_USE_TEGRA_ALLOC_FD
+#include <linux/platform/tegra/tegra_fd.h>
+#endif
+
+#include <nvgpu/dma.h>
+#include <nvgpu/enabled.h>
+#include <nvgpu/vidmem.h>
+#include <nvgpu/nvgpu_mem.h>
+#include <nvgpu/page_allocator.h>
+#include <nvgpu/gk20a.h>
+
+#include <nvgpu/linux/vm.h>
+#include <nvgpu/linux/dma.h>
+
+#include "gk20a/mm_gk20a.h"
+#include "dmabuf_vidmem.h"
+
+bool nvgpu_addr_is_vidmem_page_alloc(u64 addr)
+{
+        return !!(addr & 1ULL);
+}
+
+void nvgpu_vidmem_set_page_alloc(struct scatterlist *sgl, u64 addr)
+{
+        /* set bit 0 to indicate vidmem allocation */
+        sg_dma_address(sgl) = (addr | 1ULL);
+}
+
+struct nvgpu_page_alloc *nvgpu_vidmem_get_page_alloc(struct scatterlist *sgl)
+{
+        u64 addr;
+
+        addr = sg_dma_address(sgl);
+
+        if (nvgpu_addr_is_vidmem_page_alloc(addr))
+                addr = addr & ~1ULL;
+        else
+                WARN_ON(1);
+
+        return (struct nvgpu_page_alloc *)(uintptr_t)addr;
+}
+
+static struct sg_table *gk20a_vidbuf_map_dma_buf(
+        struct dma_buf_attachment *attach, enum dma_data_direction dir)
+{
+        struct nvgpu_vidmem_buf *buf = attach->dmabuf->priv;
+
+        return buf->mem->priv.sgt;
+}
+
+static void gk20a_vidbuf_unmap_dma_buf(struct dma_buf_attachment *attach,
+                                       struct sg_table *sgt,
+                                       enum dma_data_direction dir)
+{
+}
+
+static void gk20a_vidbuf_release(struct dma_buf *dmabuf)
+{
+        struct nvgpu_vidmem_buf *buf = dmabuf->priv;
+        struct nvgpu_vidmem_linux *linux_buf = buf->priv;
+        struct gk20a *g = buf->g;
+
+        vidmem_dbg(g, "Releasing Linux VIDMEM buf: dmabuf=0x%p size=%zuKB",
+                   dmabuf, buf->mem->size >> 10);
+
+        if (linux_buf && linux_buf->dmabuf_priv_delete)
+                linux_buf->dmabuf_priv_delete(linux_buf->dmabuf_priv);
+
+        nvgpu_kfree(g, linux_buf);
+        nvgpu_vidmem_buf_free(g, buf);
+
+        gk20a_put(g);
+}
+
+static void *gk20a_vidbuf_kmap(struct dma_buf *dmabuf, unsigned long page_num)
+{
+        WARN_ON("Not supported");
+        return NULL;
+}
+
+static void *gk20a_vidbuf_kmap_atomic(struct dma_buf *dmabuf,
+                                      unsigned long page_num)
+{
+        WARN_ON("Not supported");
+        return NULL;
+}
+
+static int gk20a_vidbuf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
+{
+        return -EINVAL;
+}
+
+static int gk20a_vidbuf_set_private(struct dma_buf *dmabuf,
+                struct device *dev, void *priv, void (*delete)(void *priv))
+{
+        struct nvgpu_vidmem_buf *buf = dmabuf->priv;
+        struct nvgpu_vidmem_linux *linux_buf = buf->priv;
+
+        linux_buf->dmabuf_priv = priv;
+        linux_buf->dmabuf_priv_delete = delete;
+
+        return 0;
+}
+
+static void *gk20a_vidbuf_get_private(struct dma_buf *dmabuf,
+                struct device *dev)
+{
+        struct nvgpu_vidmem_buf *buf = dmabuf->priv;
+        struct nvgpu_vidmem_linux *linux_buf = buf->priv;
+
+        return linux_buf->dmabuf_priv;
+}
+
+static const struct dma_buf_ops gk20a_vidbuf_ops = {
+        .map_dma_buf      = gk20a_vidbuf_map_dma_buf,
+        .unmap_dma_buf    = gk20a_vidbuf_unmap_dma_buf,
+        .release          = gk20a_vidbuf_release,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
+        .map_atomic      = gk20a_vidbuf_kmap_atomic,
+        .map             = gk20a_vidbuf_kmap,
+#else
+        .kmap_atomic      = gk20a_vidbuf_kmap_atomic,
+        .kmap             = gk20a_vidbuf_kmap,
+#endif
+        .mmap             = gk20a_vidbuf_mmap,
+        .set_drvdata      = gk20a_vidbuf_set_private,
+        .get_drvdata      = gk20a_vidbuf_get_private,
+};
+
+static struct dma_buf *gk20a_vidbuf_export(struct nvgpu_vidmem_buf *buf)
+{
+        DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
+
+        exp_info.priv = buf;
+        exp_info.ops = &gk20a_vidbuf_ops;
+        exp_info.size = buf->mem->size;
+        exp_info.flags = O_RDWR;
+
+        return dma_buf_export(&exp_info);
+}
+
+struct gk20a *nvgpu_vidmem_buf_owner(struct dma_buf *dmabuf)
+{
+        struct nvgpu_vidmem_buf *buf = dmabuf->priv;
+
+        if (dmabuf->ops != &gk20a_vidbuf_ops)
+                return NULL;
+
+        return buf->g;
+}
+
+int nvgpu_vidmem_export_linux(struct gk20a *g, size_t bytes)
+{
+        struct nvgpu_vidmem_buf *buf = NULL;
+        struct nvgpu_vidmem_linux *priv;
+        int err, fd;
+
+        /*
+         * This ref is released when the dma_buf is closed.
+         */
+        if (!gk20a_get(g))
+                return -ENODEV;
+
+        vidmem_dbg(g, "Allocating vidmem buf: %zu bytes", bytes);
+
+        priv = nvgpu_kzalloc(g, sizeof(*priv));
+        if (!priv) {
+                err = -ENOMEM;
+                goto fail;
+        }
+
+        buf = nvgpu_vidmem_user_alloc(g, bytes);
+        if (IS_ERR(buf)) {
+                err = PTR_ERR(buf);
+                goto fail;
+        }
+
+        priv->dmabuf = gk20a_vidbuf_export(buf);
+        if (IS_ERR(priv->dmabuf)) {
+                err = PTR_ERR(priv->dmabuf);
+                goto fail;
+        }
+
+        buf->priv = priv;
+
+#ifdef CONFIG_NVGPU_USE_TEGRA_ALLOC_FD
+        fd = tegra_alloc_fd(current->files, 1024, O_RDWR);
+#else
+        fd = get_unused_fd_flags(O_RDWR);
+#endif
+        if (fd < 0) {
+                /* ->release frees what we have done */
+                dma_buf_put(priv->dmabuf);
+                return fd;
+        }
+
+        /* fclose() on this drops one ref, freeing the dma buf */
+        fd_install(fd, priv->dmabuf->file);
+
+        vidmem_dbg(g, "Alloced Linux VIDMEM buf: dmabuf=0x%p size=%zuKB",
+                   priv->dmabuf, buf->mem->size >> 10);
+
+        return fd;
+
+fail:
+        nvgpu_vidmem_buf_free(g, buf);
+        nvgpu_kfree(g, priv);
+        gk20a_put(g);
+
+        vidmem_dbg(g, "Failed to alloc Linux VIDMEM buf: %d", err);
+        return err;
+}
+
+int nvgpu_vidmem_buf_access_memory(struct gk20a *g, struct dma_buf *dmabuf,
+                void *buffer, u64 offset, u64 size, u32 cmd)
+{
+        struct nvgpu_vidmem_buf *vidmem_buf;
+        struct nvgpu_mem *mem;
+        int err = 0;
+
+        if (gk20a_dmabuf_aperture(g, dmabuf) != APERTURE_VIDMEM)
+                return -EINVAL;
+
+        vidmem_buf = dmabuf->priv;
+        mem = vidmem_buf->mem;
+
+        nvgpu_speculation_barrier();
+        switch (cmd) {
+        case NVGPU_DBG_GPU_IOCTL_ACCESS_FB_MEMORY_CMD_READ:
+                nvgpu_mem_rd_n(g, mem, offset, buffer, size);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_ACCESS_FB_MEMORY_CMD_WRITE:
+                nvgpu_mem_wr_n(g, mem, offset, buffer, size);
+                break;
+
+        default:
+                err = -EINVAL;
+        }
+
+        return err;
+}
+
+void __nvgpu_mem_free_vidmem_alloc(struct gk20a *g, struct nvgpu_mem *vidmem)
+{
+        nvgpu_free(vidmem->allocator,
+                   (u64)nvgpu_vidmem_get_page_alloc(vidmem->priv.sgt->sgl));
+        nvgpu_free_sgtable(g, &vidmem->priv.sgt);
+}
diff --git a/include/os/linux/dmabuf_vidmem.h b/include/os/linux/dmabuf_vidmem.h
new file mode 100644
index 0000000..977fd78
--- /dev/null
+++ b/include/os/linux/dmabuf_vidmem.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __NVGPU_LINUX_DMABUF_VIDMEM_H__
+#define __NVGPU_LINUX_DMABUF_VIDMEM_H__
+
+#include <nvgpu/types.h>
+
+struct dma_buf;
+
+struct gk20a;
+struct scatterlist;
+
+#ifdef CONFIG_GK20A_VIDMEM
+
+struct gk20a *nvgpu_vidmem_buf_owner(struct dma_buf *dmabuf);
+int nvgpu_vidmem_export_linux(struct gk20a *g, size_t bytes);
+
+void nvgpu_vidmem_set_page_alloc(struct scatterlist *sgl, u64 addr);
+struct nvgpu_page_alloc *nvgpu_vidmem_get_page_alloc(struct scatterlist *sgl);
+
+int nvgpu_vidmem_buf_access_memory(struct gk20a *g, struct dma_buf *dmabuf,
+                void *buffer, u64 offset, u64 size, u32 cmd);
+
+#else /* !CONFIG_GK20A_VIDMEM */
+
+static inline struct gk20a *nvgpu_vidmem_buf_owner(struct dma_buf *dmabuf)
+{
+        return NULL;
+}
+
+static inline int nvgpu_vidmem_export_linux(struct gk20a *g, size_t bytes)
+{
+        return -ENOSYS;
+}
+
+static inline void nvgpu_vidmem_set_page_alloc(struct scatterlist *sgl,
+                                               u64 addr)
+{
+}
+
+static inline struct nvgpu_page_alloc *nvgpu_vidmem_get_page_alloc(
+        struct scatterlist *sgl)
+{
+        return NULL;
+}
+
+static inline int nvgpu_vidmem_buf_access_memory(struct gk20a *g,
+                                                 struct dma_buf *dmabuf,
+                                                 void *buffer, u64 offset,
+                                                 u64 size, u32 cmd)
+{
+        return -ENOSYS;
+}
+
+#endif
+
+
+struct nvgpu_vidmem_linux {
+        struct dma_buf  *dmabuf;
+        void            *dmabuf_priv;
+        void            (*dmabuf_priv_delete)(void *);
+};
+
+#endif
diff --git a/include/os/linux/driver_common.c b/include/os/linux/driver_common.c
new file mode 100644
index 0000000..c76dabe
--- /dev/null
+++ b/include/os/linux/driver_common.c
@@ -0,0 +1,351 @@
+/*
+ * Copyright (c) 2016-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/reboot.h>
+#include <linux/dma-mapping.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <uapi/linux/nvgpu.h>
+
+#include <nvgpu/defaults.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/nvgpu_common.h>
+#include <nvgpu/soc.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/enabled.h>
+#include <nvgpu/debug.h>
+#include <nvgpu/sizes.h>
+#include <nvgpu/gk20a.h>
+
+#include "platform_gk20a.h"
+#include "module.h"
+#include "os_linux.h"
+#include "sysfs.h"
+#include "ioctl.h"
+#include "gk20a/regops_gk20a.h"
+
+#define EMC3D_DEFAULT_RATIO 750
+
+void nvgpu_kernel_restart(void *cmd)
+{
+        kernel_restart(cmd);
+}
+
+static void nvgpu_init_vars(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+
+        nvgpu_cond_init(&l->sw_irq_stall_last_handled_wq);
+        nvgpu_cond_init(&l->sw_irq_nonstall_last_handled_wq);
+
+        init_rwsem(&l->busy_lock);
+        nvgpu_rwsem_init(&g->deterministic_busy);
+
+        nvgpu_spinlock_init(&g->mc_enable_lock);
+
+        nvgpu_mutex_init(&platform->railgate_lock);
+        nvgpu_mutex_init(&g->dbg_sessions_lock);
+        nvgpu_mutex_init(&g->client_lock);
+        nvgpu_mutex_init(&g->power_lock);
+        nvgpu_mutex_init(&g->ctxsw_disable_lock);
+        nvgpu_mutex_init(&g->tpc_pg_lock);
+        nvgpu_mutex_init(&g->clk_arb_enable_lock);
+        nvgpu_mutex_init(&g->cg_pg_lock);
+
+        /* Init the clock req count to 0 */
+        nvgpu_atomic_set(&g->clk_arb_global_nr, 0);
+
+        nvgpu_mutex_init(&l->ctrl.privs_lock);
+        nvgpu_init_list_node(&l->ctrl.privs);
+
+        l->regs_saved = l->regs;
+        l->bar1_saved = l->bar1;
+
+        g->emc3d_ratio = EMC3D_DEFAULT_RATIO;
+
+        /* Set DMA parameters to allow larger sgt lists */
+        dev->dma_parms = &l->dma_parms;
+        dma_set_max_seg_size(dev, UINT_MAX);
+
+        /*
+         * A default of 16GB is the largest supported DMA size that is
+         * acceptable to all currently supported Tegra SoCs.
+         */
+        if (!platform->dma_mask)
+                platform->dma_mask = DMA_BIT_MASK(34);
+
+        dma_set_mask(dev, platform->dma_mask);
+        dma_set_coherent_mask(dev, platform->dma_mask);
+
+        nvgpu_init_list_node(&g->profiler_objects);
+
+        nvgpu_init_list_node(&g->boardobj_head);
+        nvgpu_init_list_node(&g->boardobjgrp_head);
+
+        __nvgpu_set_enabled(g, NVGPU_HAS_SYNCPOINTS, platform->has_syncpoints);
+}
+
+static void nvgpu_init_gr_vars(struct gk20a *g)
+{
+        gk20a_init_gr(g);
+
+        nvgpu_log_info(g, "total ram pages : %lu", totalram_pages);
+        g->gr.max_comptag_mem = totalram_size_in_mb;
+}
+
+static void nvgpu_init_timeout(struct gk20a *g)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev_from_gk20a(g));
+
+        g->timeouts_disabled_by_user = false;
+        nvgpu_atomic_set(&g->timeouts_disabled_refcount, 0);
+
+        if (nvgpu_platform_is_silicon(g)) {
+                g->gr_idle_timeout_default = NVGPU_DEFAULT_GR_IDLE_TIMEOUT;
+        } else if (nvgpu_platform_is_fpga(g)) {
+                g->gr_idle_timeout_default = GK20A_TIMEOUT_FPGA;
+        } else {
+                g->gr_idle_timeout_default = (u32)ULONG_MAX;
+        }
+        g->ch_wdt_timeout_ms = platform->ch_wdt_timeout_ms;
+        g->fifo_eng_timeout_us = GRFIFO_TIMEOUT_CHECK_PERIOD_US;
+}
+
+static void nvgpu_init_timeslice(struct gk20a *g)
+{
+        g->runlist_interleave = true;
+
+        g->timeslice_low_priority_us = 1300;
+        g->timeslice_medium_priority_us = 2600;
+        g->timeslice_high_priority_us = 5200;
+
+        g->min_timeslice_us = 1000;
+        g->max_timeslice_us = 50000;
+}
+
+static void nvgpu_init_pm_vars(struct gk20a *g)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev_from_gk20a(g));
+        u32 i = 0;
+
+        /*
+         * Set up initial power settings. For non-slicon platforms, disable
+         * power features and for silicon platforms, read from platform data
+         */
+        g->slcg_enabled =
+                nvgpu_platform_is_silicon(g) ? platform->enable_slcg : false;
+        g->blcg_enabled =
+                nvgpu_platform_is_silicon(g) ? platform->enable_blcg : false;
+        g->elcg_enabled =
+                nvgpu_platform_is_silicon(g) ? platform->enable_elcg : false;
+        g->elpg_enabled =
+                nvgpu_platform_is_silicon(g) ? platform->enable_elpg : false;
+        g->aelpg_enabled =
+                nvgpu_platform_is_silicon(g) ? platform->enable_aelpg : false;
+        g->mscg_enabled =
+                nvgpu_platform_is_silicon(g) ? platform->enable_mscg : false;
+        g->can_elpg =
+                nvgpu_platform_is_silicon(g) ? platform->can_elpg_init : false;
+
+        __nvgpu_set_enabled(g, NVGPU_GPU_CAN_ELCG,
+                nvgpu_platform_is_silicon(g) ? platform->can_elcg : false);
+        __nvgpu_set_enabled(g, NVGPU_GPU_CAN_SLCG,
+                nvgpu_platform_is_silicon(g) ? platform->can_slcg : false);
+        __nvgpu_set_enabled(g, NVGPU_GPU_CAN_BLCG,
+                nvgpu_platform_is_silicon(g) ? platform->can_blcg : false);
+
+        g->aggressive_sync_destroy = platform->aggressive_sync_destroy;
+        g->aggressive_sync_destroy_thresh = platform->aggressive_sync_destroy_thresh;
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        g->has_cde = platform->has_cde;
+#endif
+        g->ptimer_src_freq = platform->ptimer_src_freq;
+        g->support_pmu = support_gk20a_pmu(dev_from_gk20a(g));
+        __nvgpu_set_enabled(g, NVGPU_CAN_RAILGATE, platform->can_railgate_init);
+        g->can_tpc_powergate = platform->can_tpc_powergate;
+
+        for (i = 0; i < MAX_TPC_PG_CONFIGS; i++)
+                g->valid_tpc_mask[i] = platform->valid_tpc_mask[i];
+
+        g->ldiv_slowdown_factor = platform->ldiv_slowdown_factor_init;
+        /* if default delay is not set, set default delay to 500msec */
+        if (platform->railgate_delay_init)
+                g->railgate_delay = platform->railgate_delay_init;
+        else
+                g->railgate_delay = NVGPU_DEFAULT_RAILGATE_IDLE_TIMEOUT;
+        __nvgpu_set_enabled(g, NVGPU_PMU_PERFMON, platform->enable_perfmon);
+
+        /* set default values to aelpg parameters */
+        g->pmu.aelpg_param[0] = APCTRL_SAMPLING_PERIOD_PG_DEFAULT_US;
+        g->pmu.aelpg_param[1] = APCTRL_MINIMUM_IDLE_FILTER_DEFAULT_US;
+        g->pmu.aelpg_param[2] = APCTRL_MINIMUM_TARGET_SAVING_DEFAULT_US;
+        g->pmu.aelpg_param[3] = APCTRL_POWER_BREAKEVEN_DEFAULT_US;
+        g->pmu.aelpg_param[4] = APCTRL_CYCLES_PER_SAMPLE_MAX_DEFAULT;
+
+        __nvgpu_set_enabled(g, NVGPU_SUPPORT_ASPM, !platform->disable_aspm);
+}
+
+static void nvgpu_init_vbios_vars(struct gk20a *g)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev_from_gk20a(g));
+
+        __nvgpu_set_enabled(g, NVGPU_PMU_RUN_PREOS, platform->run_preos);
+        g->vbios_min_version = platform->vbios_min_version;
+}
+
+static void  nvgpu_init_ltc_vars(struct gk20a *g)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev_from_gk20a(g));
+
+        g->ltc_streamid = platform->ltc_streamid;
+}
+
+static void nvgpu_init_mm_vars(struct gk20a *g)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev_from_gk20a(g));
+
+        g->mm.disable_bigpage = platform->disable_bigpage;
+        __nvgpu_set_enabled(g, NVGPU_MM_HONORS_APERTURE,
+                            platform->honors_aperture);
+        __nvgpu_set_enabled(g, NVGPU_MM_UNIFIED_MEMORY,
+                            platform->unified_memory);
+        __nvgpu_set_enabled(g, NVGPU_MM_UNIFY_ADDRESS_SPACES,
+                            platform->unify_address_spaces);
+        __nvgpu_set_enabled(g, NVGPU_MM_FORCE_128K_PMU_VM,
+                            platform->force_128K_pmu_vm);
+
+        nvgpu_mutex_init(&g->mm.tlb_lock);
+        nvgpu_mutex_init(&g->mm.priv_lock);
+}
+
+int nvgpu_probe(struct gk20a *g,
+                const char *debugfs_symlink,
+                const char *interface_name,
+                struct class *class)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        int err = 0;
+
+        nvgpu_init_vars(g);
+        nvgpu_init_gr_vars(g);
+        nvgpu_init_timeout(g);
+        nvgpu_init_timeslice(g);
+        nvgpu_init_pm_vars(g);
+        nvgpu_init_vbios_vars(g);
+        nvgpu_init_ltc_vars(g);
+        err = nvgpu_init_soc_vars(g);
+        if (err) {
+                nvgpu_err(g, "init soc vars failed");
+                return err;
+        }
+
+        /* Initialize the platform interface. */
+        err = platform->probe(dev);
+        if (err) {
+                if (err == -EPROBE_DEFER)
+                        nvgpu_info(g, "platform probe failed");
+                else
+                        nvgpu_err(g, "platform probe failed");
+                return err;
+        }
+
+        nvgpu_init_mm_vars(g);
+
+        /* platform probe can defer do user init only if probe succeeds */
+        err = gk20a_user_init(dev, interface_name, class);
+        if (err)
+                return err;
+
+        if (platform->late_probe) {
+                err = platform->late_probe(dev);
+                if (err) {
+                        nvgpu_err(g, "late probe failed");
+                        return err;
+                }
+        }
+
+        nvgpu_create_sysfs(dev);
+        gk20a_debug_init(g, debugfs_symlink);
+
+        g->dbg_regops_tmp_buf = nvgpu_kzalloc(g, SZ_4K);
+        if (!g->dbg_regops_tmp_buf) {
+                nvgpu_err(g, "couldn't allocate regops tmp buf");
+                return -ENOMEM;
+        }
+        g->dbg_regops_tmp_buf_ops =
+                SZ_4K / sizeof(g->dbg_regops_tmp_buf[0]);
+
+        g->remove_support = gk20a_remove_support;
+
+        nvgpu_ref_init(&g->refcount);
+
+        return 0;
+}
+
+/**
+ * cyclic_delta - Returns delta of cyclic integers a and b.
+ *
+ * @a - First integer
+ * @b - Second integer
+ *
+ * Note: if a is ahead of b, delta is positive.
+ */
+static int cyclic_delta(int a, int b)
+{
+        return a - b;
+}
+
+/**
+ * nvgpu_wait_for_deferred_interrupts - Wait for interrupts to complete
+ *
+ * @g - The GPU to wait on.
+ *
+ * Waits until all interrupt handlers that have been scheduled to run have
+ * completed.
+ */
+void nvgpu_wait_for_deferred_interrupts(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        int stall_irq_threshold = atomic_read(&l->hw_irq_stall_count);
+        int nonstall_irq_threshold = atomic_read(&l->hw_irq_nonstall_count);
+
+        /* wait until all stalling irqs are handled */
+        NVGPU_COND_WAIT(&l->sw_irq_stall_last_handled_wq,
+                   cyclic_delta(stall_irq_threshold,
+                                atomic_read(&l->sw_irq_stall_last_handled))
+                   <= 0, 0);
+
+        /* wait until all non-stalling irqs are handled */
+        NVGPU_COND_WAIT(&l->sw_irq_nonstall_last_handled_wq,
+                   cyclic_delta(nonstall_irq_threshold,
+                                atomic_read(&l->sw_irq_nonstall_last_handled))
+                   <= 0, 0);
+}
+
+static void nvgpu_free_gk20a(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        kfree(l);
+}
+
+void nvgpu_init_gk20a(struct gk20a *g)
+{
+        g->free = nvgpu_free_gk20a;
+}
diff --git a/include/os/linux/driver_common.h b/include/os/linux/driver_common.h
new file mode 100644
index 0000000..6f42f77
--- /dev/null
+++ b/include/os/linux/driver_common.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2016-2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NVGPU_LINUX_DRIVER_COMMON
+#define NVGPU_LINUX_DRIVER_COMMON
+
+void nvgpu_init_gk20a(struct gk20a *g);
+
+#endif
diff --git a/include/os/linux/dt.c b/include/os/linux/dt.c
new file mode 100644
index 0000000..88e391e
--- /dev/null
+++ b/include/os/linux/dt.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <nvgpu/dt.h>
+#include <linux/of.h>
+
+#include "os_linux.h"
+
+int nvgpu_dt_read_u32_index(struct gk20a *g, const char *name,
+                                u32 index, u32 *value)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct device_node *np = dev->of_node;
+
+        return of_property_read_u32_index(np, name, index, value);
+}
diff --git a/include/os/linux/ecc_sysfs.c b/include/os/linux/ecc_sysfs.c
new file mode 100644
index 0000000..73ae3dc
--- /dev/null
+++ b/include/os/linux/ecc_sysfs.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <nvgpu/ecc.h>
+#include <nvgpu/gk20a.h>
+
+#include "os_linux.h"
+
+int nvgpu_ecc_sysfs_init(struct gk20a *g)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct nvgpu_ecc *ecc = &g->ecc;
+        struct dev_ext_attribute *attr;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct nvgpu_ecc_stat *stat;
+        int i = 0, err;
+
+        attr = nvgpu_kzalloc(g, sizeof(*attr) * ecc->stats_count);
+        if (!attr)
+                return -ENOMEM;
+
+        nvgpu_list_for_each_entry(stat,
+                        &ecc->stats_list, nvgpu_ecc_stat, node) {
+                if (i >= ecc->stats_count) {
+                        err = -EINVAL;
+                        nvgpu_err(g, "stats_list longer than stats_count %d",
+                                        ecc->stats_count);
+                        break;
+                }
+                sysfs_attr_init(&attr[i].attr.attr);
+                attr[i].attr.attr.name = stat->name;
+                attr[i].attr.attr.mode = VERIFY_OCTAL_PERMISSIONS(S_IRUGO);
+                attr[i].var =  &stat->counter;
+                attr[i].attr.show = device_show_int;
+                err = device_create_file(dev, &attr[i].attr);
+                if (err) {
+                        nvgpu_err(g, "sysfs node create failed for %s\n",
+                                        stat->name);
+                        break;
+                }
+                i++;
+        }
+
+        if (err) {
+                while (i-- > 0)
+                        device_remove_file(dev, &attr[i].attr);
+                nvgpu_kfree(g, attr);
+                return err;
+        }
+
+        l->ecc_attrs = attr;
+
+        return 0;
+}
+
+void nvgpu_ecc_sysfs_remove(struct gk20a *g)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct nvgpu_ecc *ecc = &g->ecc;
+        int i;
+
+        for (i = 0; i < ecc->stats_count; i++)
+                device_remove_file(dev, &l->ecc_attrs[i].attr);
+        nvgpu_kfree(g, l->ecc_attrs);
+        l->ecc_attrs = NULL;
+}
diff --git a/include/os/linux/firmware.c b/include/os/linux/firmware.c
new file mode 100644
index 0000000..8f0344b
--- /dev/null
+++ b/include/os/linux/firmware.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/firmware.h>
+
+#include <nvgpu/kmem.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/firmware.h>
+#include <nvgpu/gk20a.h>
+
+#include "platform_gk20a.h"
+#include "os_linux.h"
+
+static const struct firmware *do_request_firmware(struct device *dev,
+                const char *prefix, const char *fw_name, int flags)
+{
+        const struct firmware *fw;
+        char *fw_path = NULL;
+        int path_len, err;
+
+        if (prefix) {
+                path_len = strlen(prefix) + strlen(fw_name);
+                path_len += 2; /* for the path separator and zero terminator*/
+
+                fw_path = nvgpu_kzalloc(get_gk20a(dev),
+                                        sizeof(*fw_path) * path_len);
+                if (!fw_path)
+                        return NULL;
+
+                sprintf(fw_path, "%s/%s", prefix, fw_name);
+                fw_name = fw_path;
+        }
+
+        if (flags & NVGPU_REQUEST_FIRMWARE_NO_WARN)
+                err = request_firmware_direct(&fw, fw_name, dev);
+        else
+                err = request_firmware(&fw, fw_name, dev);
+
+        nvgpu_kfree(get_gk20a(dev), fw_path);
+        if (err)
+                return NULL;
+        return fw;
+}
+
+/* This is a simple wrapper around request_firmware that takes 'fw_name' and
+ * applies an IP specific relative path prefix to it. The caller is
+ * responsible for calling nvgpu_release_firmware later. */
+struct nvgpu_firmware *nvgpu_request_firmware(struct gk20a *g,
+                                              const char *fw_name,
+                                              int flags)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct nvgpu_firmware *fw;
+        const struct firmware *linux_fw;
+
+        /* current->fs is NULL when calling from SYS_EXIT.
+           Add a check here to prevent crash in request_firmware */
+        if (!current->fs || !fw_name)
+                return NULL;
+
+        fw = nvgpu_kzalloc(g, sizeof(*fw));
+        if (!fw)
+                return NULL;
+
+        linux_fw = do_request_firmware(dev, g->name, fw_name, flags);
+
+#ifdef CONFIG_TEGRA_GK20A
+        /* TO BE REMOVED - Support loading from legacy SOC specific path. */
+        if (!linux_fw && !(flags & NVGPU_REQUEST_FIRMWARE_NO_SOC)) {
+                struct gk20a_platform *platform = gk20a_get_platform(dev);
+                linux_fw = do_request_firmware(dev,
+                                platform->soc_name, fw_name, flags);
+        }
+#endif
+
+        if (!linux_fw)
+                goto err;
+
+        fw->data = nvgpu_kmalloc(g, linux_fw->size);
+        if (!fw->data)
+                goto err_release;
+
+        memcpy(fw->data, linux_fw->data, linux_fw->size);
+        fw->size = linux_fw->size;
+
+        release_firmware(linux_fw);
+
+        return fw;
+
+err_release:
+        release_firmware(linux_fw);
+err:
+        nvgpu_kfree(g, fw);
+        return NULL;
+}
+
+void nvgpu_release_firmware(struct gk20a *g, struct nvgpu_firmware *fw)
+{
+        if(!fw)
+                return;
+
+        nvgpu_kfree(g, fw->data);
+        nvgpu_kfree(g, fw);
+}
diff --git a/include/os/linux/fuse.c b/include/os/linux/fuse.c
new file mode 100644
index 0000000..27851f9
--- /dev/null
+++ b/include/os/linux/fuse.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <soc/tegra/fuse.h>
+
+#include <nvgpu/fuse.h>
+
+int nvgpu_tegra_get_gpu_speedo_id(struct gk20a *g)
+{
+        return tegra_sku_info.gpu_speedo_id;
+}
+
+/*
+ * Use tegra_fuse_control_read/write() APIs for fuse offsets upto 0x100
+ * Use tegra_fuse_readl/writel() APIs for fuse offsets above 0x100
+ */
+void nvgpu_tegra_fuse_write_bypass(struct gk20a *g, u32 val)
+{
+        tegra_fuse_control_write(val, FUSE_FUSEBYPASS_0);
+}
+
+void nvgpu_tegra_fuse_write_access_sw(struct gk20a *g, u32 val)
+{
+        tegra_fuse_control_write(val, FUSE_WRITE_ACCESS_SW_0);
+}
+
+void nvgpu_tegra_fuse_write_opt_gpu_tpc0_disable(struct gk20a *g, u32 val)
+{
+        tegra_fuse_writel(val, FUSE_OPT_GPU_TPC0_DISABLE_0);
+}
+
+void nvgpu_tegra_fuse_write_opt_gpu_tpc1_disable(struct gk20a *g, u32 val)
+{
+        tegra_fuse_writel(val, FUSE_OPT_GPU_TPC1_DISABLE_0);
+}
+
+int nvgpu_tegra_fuse_read_gcplex_config_fuse(struct gk20a *g, u32 *val)
+{
+        return tegra_fuse_readl(FUSE_GCPLEX_CONFIG_FUSE_0, val);
+}
+
+int nvgpu_tegra_fuse_read_reserved_calib(struct gk20a *g, u32 *val)
+{
+        return tegra_fuse_readl(FUSE_RESERVED_CALIB0_0, val);
+}
diff --git a/include/os/linux/intr.c b/include/os/linux/intr.c
new file mode 100644
index 0000000..8838b72
--- /dev/null
+++ b/include/os/linux/intr.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2014-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <trace/events/gk20a.h>
+#include <linux/irqreturn.h>
+
+#include <nvgpu/gk20a.h>
+
+#include <nvgpu/atomic.h>
+#include <nvgpu/unit.h>
+#include "os_linux.h"
+
+irqreturn_t nvgpu_intr_stall(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        u32 mc_intr_0;
+
+        trace_mc_gk20a_intr_stall(g->name);
+
+        if (!g->power_on)
+                return IRQ_NONE;
+
+        /* not from gpu when sharing irq with others */
+        mc_intr_0 = g->ops.mc.intr_stall(g);
+        if (unlikely(!mc_intr_0))
+                return IRQ_NONE;
+
+        g->ops.mc.intr_stall_pause(g);
+
+        atomic_inc(&l->hw_irq_stall_count);
+
+        trace_mc_gk20a_intr_stall_done(g->name);
+
+        return IRQ_WAKE_THREAD;
+}
+
+irqreturn_t nvgpu_intr_thread_stall(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        int hw_irq_count;
+
+        nvgpu_log(g, gpu_dbg_intr, "interrupt thread launched");
+
+        trace_mc_gk20a_intr_thread_stall(g->name);
+
+        hw_irq_count = atomic_read(&l->hw_irq_stall_count);
+        g->ops.mc.isr_stall(g);
+        g->ops.mc.intr_stall_resume(g);
+        /* sync handled irq counter before re-enabling interrupts */
+        atomic_set(&l->sw_irq_stall_last_handled, hw_irq_count);
+
+        nvgpu_cond_broadcast(&l->sw_irq_stall_last_handled_wq);
+
+        trace_mc_gk20a_intr_thread_stall_done(g->name);
+
+        return IRQ_HANDLED;
+}
+
+irqreturn_t nvgpu_intr_nonstall(struct gk20a *g)
+{
+        u32 non_stall_intr_val;
+        u32 hw_irq_count;
+        int ops_old, ops_new, ops = 0;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        if (!g->power_on)
+                return IRQ_NONE;
+
+        /* not from gpu when sharing irq with others */
+        non_stall_intr_val = g->ops.mc.intr_nonstall(g);
+        if (unlikely(!non_stall_intr_val))
+                return IRQ_NONE;
+
+        g->ops.mc.intr_nonstall_pause(g);
+
+        ops = g->ops.mc.isr_nonstall(g);
+        if (ops) {
+                do {
+                        ops_old = atomic_read(&l->nonstall_ops);
+                        ops_new  = ops_old | ops;
+                } while (ops_old != atomic_cmpxchg(&l->nonstall_ops,
+                                                ops_old, ops_new));
+
+                queue_work(l->nonstall_work_queue, &l->nonstall_fn_work);
+        }
+
+        hw_irq_count = atomic_inc_return(&l->hw_irq_nonstall_count);
+
+        /* sync handled irq counter before re-enabling interrupts */
+        atomic_set(&l->sw_irq_nonstall_last_handled, hw_irq_count);
+
+        g->ops.mc.intr_nonstall_resume(g);
+
+        nvgpu_cond_broadcast(&l->sw_irq_nonstall_last_handled_wq);
+
+        return IRQ_HANDLED;
+}
+
+static void mc_gk20a_handle_intr_nonstall(struct gk20a *g, u32 ops)
+{
+        bool semaphore_wakeup, post_events;
+
+        semaphore_wakeup =
+                (((ops & GK20A_NONSTALL_OPS_WAKEUP_SEMAPHORE) != 0U) ?
+                                        true : false);
+        post_events = (((ops & GK20A_NONSTALL_OPS_POST_EVENTS) != 0U) ?
+                                        true: false);
+
+        if (semaphore_wakeup) {
+                g->ops.semaphore_wakeup(g, post_events);
+        }
+}
+
+void nvgpu_intr_nonstall_cb(struct work_struct *work)
+{
+        struct nvgpu_os_linux *l =
+                container_of(work, struct nvgpu_os_linux, nonstall_fn_work);
+        struct gk20a *g = &l->g;
+
+        do {
+                u32 ops;
+
+                ops = atomic_xchg(&l->nonstall_ops, 0);
+                mc_gk20a_handle_intr_nonstall(g, ops);
+        } while (atomic_read(&l->nonstall_ops) != 0);
+}
diff --git a/include/os/linux/intr.h b/include/os/linux/intr.h
new file mode 100644
index 0000000..d43cdcc
--- /dev/null
+++ b/include/os/linux/intr.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2014-2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#ifndef __NVGPU_LINUX_INTR_H__
+#define __NVGPU_LINUX_INTR_H__
+struct gk20a;
+
+irqreturn_t nvgpu_intr_stall(struct gk20a *g);
+irqreturn_t nvgpu_intr_thread_stall(struct gk20a *g);
+irqreturn_t nvgpu_intr_nonstall(struct gk20a *g);
+void nvgpu_intr_nonstall_cb(struct work_struct *work);
+#endif
diff --git a/include/os/linux/io.c b/include/os/linux/io.c
new file mode 100644
index 0000000..3e84e88
--- /dev/null
+++ b/include/os/linux/io.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <nvgpu/io.h>
+#include <nvgpu/types.h>
+#include <nvgpu/gk20a.h>
+
+#include "os_linux.h"
+
+void nvgpu_writel(struct gk20a *g, u32 r, u32 v)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        if (unlikely(!l->regs)) {
+                __gk20a_warn_on_no_regs();
+                nvgpu_log(g, gpu_dbg_reg, "r=0x%x v=0x%x (failed)", r, v);
+        } else {
+                writel_relaxed(v, l->regs + r);
+                nvgpu_wmb();
+                nvgpu_log(g, gpu_dbg_reg, "r=0x%x v=0x%x", r, v);
+        }
+}
+
+void nvgpu_writel_relaxed(struct gk20a *g, u32 r, u32 v)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        if (unlikely(!l->regs)) {
+                __gk20a_warn_on_no_regs();
+                nvgpu_log(g, gpu_dbg_reg, "r=0x%x v=0x%x (failed)", r, v);
+        } else {
+                writel_relaxed(v, l->regs + r);
+        }
+}
+
+u32 nvgpu_readl(struct gk20a *g, u32 r)
+{
+        u32 v = __nvgpu_readl(g, r);
+
+        if (v == 0xffffffff)
+                __nvgpu_check_gpu_state(g);
+
+        return v;
+}
+
+u32 __nvgpu_readl(struct gk20a *g, u32 r)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        u32 v = 0xffffffff;
+
+        if (unlikely(!l->regs)) {
+                __gk20a_warn_on_no_regs();
+                nvgpu_log(g, gpu_dbg_reg, "r=0x%x v=0x%x (failed)", r, v);
+        } else {
+                v = readl(l->regs + r);
+                nvgpu_log(g, gpu_dbg_reg, "r=0x%x v=0x%x", r, v);
+        }
+
+        return v;
+}
+
+void nvgpu_writel_loop(struct gk20a *g, u32 r, u32 v)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        if (unlikely(!l->regs)) {
+                __gk20a_warn_on_no_regs();
+                nvgpu_log(g, gpu_dbg_reg, "r=0x%x v=0x%x (failed)", r, v);
+        } else {
+                nvgpu_wmb();
+                do {
+                        writel_relaxed(v, l->regs + r);
+                } while (readl(l->regs + r) != v);
+                nvgpu_log(g, gpu_dbg_reg, "r=0x%x v=0x%x", r, v);
+        }
+}
+
+void nvgpu_bar1_writel(struct gk20a *g, u32 b, u32 v)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        if (unlikely(!l->bar1)) {
+                __gk20a_warn_on_no_regs();
+                nvgpu_log(g, gpu_dbg_reg, "b=0x%x v=0x%x (failed)", b, v);
+        } else {
+                nvgpu_wmb();
+                writel_relaxed(v, l->bar1 + b);
+                nvgpu_log(g, gpu_dbg_reg, "b=0x%x v=0x%x", b, v);
+        }
+}
+
+u32 nvgpu_bar1_readl(struct gk20a *g, u32 b)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        u32 v = 0xffffffff;
+
+        if (unlikely(!l->bar1)) {
+                __gk20a_warn_on_no_regs();
+                nvgpu_log(g, gpu_dbg_reg, "b=0x%x v=0x%x (failed)", b, v);
+        } else {
+                v = readl(l->bar1 + b);
+                nvgpu_log(g, gpu_dbg_reg, "b=0x%x v=0x%x", b, v);
+        }
+
+        return v;
+}
+
+bool nvgpu_io_exists(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        return l->regs != NULL;
+}
+
+bool nvgpu_io_valid_reg(struct gk20a *g, u32 r)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        return r < resource_size(l->regs);
+}
diff --git a/include/os/linux/io_usermode.c b/include/os/linux/io_usermode.c
new file mode 100644
index 0000000..ffc532f
--- /dev/null
+++ b/include/os/linux/io_usermode.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <nvgpu/io.h>
+#include <nvgpu/types.h>
+#include <nvgpu/gk20a.h>
+
+#include "os_linux.h"
+
+#include <nvgpu/hw/gv11b/hw_usermode_gv11b.h>
+
+void nvgpu_usermode_writel(struct gk20a *g, u32 r, u32 v)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        void __iomem *reg = l->usermode_regs + (r - usermode_cfg0_r());
+
+        writel_relaxed(v, reg);
+        nvgpu_log(g, gpu_dbg_reg, "usermode r=0x%x v=0x%x", r, v);
+}
diff --git a/include/os/linux/ioctl.c b/include/os/linux/ioctl.c
new file mode 100644
index 0000000..a40df2a
--- /dev/null
+++ b/include/os/linux/ioctl.c
@@ -0,0 +1,297 @@
+/*
+ * NVGPU IOCTLs
+ *
+ * Copyright (c) 2011-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/file.h>
+
+#include <nvgpu/nvgpu_common.h>
+#include <nvgpu/ctxsw_trace.h>
+#include <nvgpu/gk20a.h>
+
+#include "gk20a/dbg_gpu_gk20a.h"
+
+#include "ioctl_channel.h"
+#include "ioctl_ctrl.h"
+#include "ioctl_as.h"
+#include "ioctl_tsg.h"
+#include "ioctl_dbg.h"
+#include "module.h"
+#include "os_linux.h"
+#include "ctxsw_trace.h"
+#include "platform_gk20a.h"
+
+#define GK20A_NUM_CDEVS 7
+
+const struct file_operations gk20a_channel_ops = {
+        .owner = THIS_MODULE,
+        .release = gk20a_channel_release,
+        .open = gk20a_channel_open,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl = gk20a_channel_ioctl,
+#endif
+        .unlocked_ioctl = gk20a_channel_ioctl,
+};
+
+static const struct file_operations gk20a_ctrl_ops = {
+        .owner = THIS_MODULE,
+        .release = gk20a_ctrl_dev_release,
+        .open = gk20a_ctrl_dev_open,
+        .unlocked_ioctl = gk20a_ctrl_dev_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl = gk20a_ctrl_dev_ioctl,
+#endif
+        .mmap = gk20a_ctrl_dev_mmap,
+};
+
+static const struct file_operations gk20a_dbg_ops = {
+        .owner = THIS_MODULE,
+        .release = gk20a_dbg_gpu_dev_release,
+        .open = gk20a_dbg_gpu_dev_open,
+        .unlocked_ioctl = gk20a_dbg_gpu_dev_ioctl,
+        .poll = gk20a_dbg_gpu_dev_poll,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl = gk20a_dbg_gpu_dev_ioctl,
+#endif
+};
+
+static const struct file_operations gk20a_as_ops = {
+        .owner = THIS_MODULE,
+        .release = gk20a_as_dev_release,
+        .open = gk20a_as_dev_open,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl = gk20a_as_dev_ioctl,
+#endif
+        .unlocked_ioctl = gk20a_as_dev_ioctl,
+};
+
+/*
+ * Note: We use a different 'open' to trigger handling of the profiler session.
+ * Most of the code is shared between them...  Though, at some point if the
+ * code does get too tangled trying to handle each in the same path we can
+ * separate them cleanly.
+ */
+static const struct file_operations gk20a_prof_ops = {
+        .owner = THIS_MODULE,
+        .release = gk20a_dbg_gpu_dev_release,
+        .open = gk20a_prof_gpu_dev_open,
+        .unlocked_ioctl = gk20a_dbg_gpu_dev_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl = gk20a_dbg_gpu_dev_ioctl,
+#endif
+};
+
+static const struct file_operations gk20a_tsg_ops = {
+        .owner = THIS_MODULE,
+        .release = nvgpu_ioctl_tsg_dev_release,
+        .open = nvgpu_ioctl_tsg_dev_open,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl = nvgpu_ioctl_tsg_dev_ioctl,
+#endif
+        .unlocked_ioctl = nvgpu_ioctl_tsg_dev_ioctl,
+};
+
+#ifdef CONFIG_GK20A_CTXSW_TRACE
+static const struct file_operations gk20a_ctxsw_ops = {
+        .owner = THIS_MODULE,
+        .release = gk20a_ctxsw_dev_release,
+        .open = gk20a_ctxsw_dev_open,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl = gk20a_ctxsw_dev_ioctl,
+#endif
+        .unlocked_ioctl = gk20a_ctxsw_dev_ioctl,
+        .poll = gk20a_ctxsw_dev_poll,
+        .read = gk20a_ctxsw_dev_read,
+        .mmap = gk20a_ctxsw_dev_mmap,
+};
+#endif
+
+static const struct file_operations gk20a_sched_ops = {
+        .owner = THIS_MODULE,
+        .release = gk20a_sched_dev_release,
+        .open = gk20a_sched_dev_open,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl = gk20a_sched_dev_ioctl,
+#endif
+        .unlocked_ioctl = gk20a_sched_dev_ioctl,
+        .poll = gk20a_sched_dev_poll,
+        .read = gk20a_sched_dev_read,
+};
+
+static int gk20a_create_device(
+        struct device *dev, int devno,
+        const char *interface_name, const char *cdev_name,
+        struct cdev *cdev, struct device **out,
+        const struct file_operations *ops,
+        struct class *class)
+{
+        struct device *subdev;
+        int err;
+        struct gk20a *g = gk20a_from_dev(dev);
+
+        nvgpu_log_fn(g, " ");
+
+        cdev_init(cdev, ops);
+        cdev->owner = THIS_MODULE;
+
+        err = cdev_add(cdev, devno, 1);
+        if (err) {
+                dev_err(dev, "failed to add %s cdev\n", cdev_name);
+                return err;
+        }
+
+        subdev = device_create(class, NULL, devno, NULL,
+                interface_name, cdev_name);
+
+        if (IS_ERR(subdev)) {
+                err = PTR_ERR(dev);
+                cdev_del(cdev);
+                dev_err(dev, "failed to create %s device for %s\n",
+                        cdev_name, dev_name(dev));
+                return err;
+        }
+
+        *out = subdev;
+        return 0;
+}
+
+void gk20a_user_deinit(struct device *dev, struct class *class)
+{
+        struct gk20a *g = gk20a_from_dev(dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        if (l->channel.node) {
+                device_destroy(class, l->channel.cdev.dev);
+                cdev_del(&l->channel.cdev);
+        }
+
+        if (l->as_dev.node) {
+                device_destroy(class, l->as_dev.cdev.dev);
+                cdev_del(&l->as_dev.cdev);
+        }
+
+        if (l->ctrl.node) {
+                device_destroy(class, l->ctrl.cdev.dev);
+                cdev_del(&l->ctrl.cdev);
+        }
+
+        if (l->dbg.node) {
+                device_destroy(class, l->dbg.cdev.dev);
+                cdev_del(&l->dbg.cdev);
+        }
+
+        if (l->prof.node) {
+                device_destroy(class, l->prof.cdev.dev);
+                cdev_del(&l->prof.cdev);
+        }
+
+        if (l->tsg.node) {
+                device_destroy(class, l->tsg.cdev.dev);
+                cdev_del(&l->tsg.cdev);
+        }
+
+        if (l->ctxsw.node) {
+                device_destroy(class, l->ctxsw.cdev.dev);
+                cdev_del(&l->ctxsw.cdev);
+        }
+
+        if (l->sched.node) {
+                device_destroy(class, l->sched.cdev.dev);
+                cdev_del(&l->sched.cdev);
+        }
+
+        if (l->cdev_region)
+                unregister_chrdev_region(l->cdev_region, GK20A_NUM_CDEVS);
+}
+
+int gk20a_user_init(struct device *dev, const char *interface_name,
+                    struct class *class)
+{
+        int err;
+        dev_t devno;
+        struct gk20a *g = gk20a_from_dev(dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        err = alloc_chrdev_region(&devno, 0, GK20A_NUM_CDEVS, dev_name(dev));
+        if (err) {
+                dev_err(dev, "failed to allocate devno\n");
+                goto fail;
+        }
+        l->cdev_region = devno;
+
+        err = gk20a_create_device(dev, devno++, interface_name, "",
+                                  &l->channel.cdev, &l->channel.node,
+                                  &gk20a_channel_ops,
+                                  class);
+        if (err)
+                goto fail;
+
+        err = gk20a_create_device(dev, devno++, interface_name, "-as",
+                                  &l->as_dev.cdev, &l->as_dev.node,
+                                  &gk20a_as_ops,
+                                  class);
+        if (err)
+                goto fail;
+
+        err = gk20a_create_device(dev, devno++, interface_name, "-ctrl",
+                                  &l->ctrl.cdev, &l->ctrl.node,
+                                  &gk20a_ctrl_ops,
+                                  class);
+        if (err)
+                goto fail;
+
+        err = gk20a_create_device(dev, devno++, interface_name, "-dbg",
+                                  &l->dbg.cdev, &l->dbg.node,
+                                  &gk20a_dbg_ops,
+                                  class);
+        if (err)
+                goto fail;
+
+        err = gk20a_create_device(dev, devno++, interface_name, "-prof",
+                                  &l->prof.cdev, &l->prof.node,
+                                  &gk20a_prof_ops,
+                                  class);
+        if (err)
+                goto fail;
+
+        err = gk20a_create_device(dev, devno++, interface_name, "-tsg",
+                                  &l->tsg.cdev, &l->tsg.node,
+                                  &gk20a_tsg_ops,
+                                  class);
+        if (err)
+                goto fail;
+
+#if defined(CONFIG_GK20A_CTXSW_TRACE)
+        err = gk20a_create_device(dev, devno++, interface_name, "-ctxsw",
+                                  &l->ctxsw.cdev, &l->ctxsw.node,
+                                  &gk20a_ctxsw_ops,
+                                  class);
+        if (err)
+                goto fail;
+#endif
+
+        err = gk20a_create_device(dev, devno++, interface_name, "-sched",
+                                  &l->sched.cdev, &l->sched.node,
+                                  &gk20a_sched_ops,
+                                  class);
+        if (err)
+                goto fail;
+
+        return 0;
+fail:
+        gk20a_user_deinit(dev, &nvgpu_class);
+        return err;
+}
diff --git a/include/os/linux/ioctl.h b/include/os/linux/ioctl.h
new file mode 100644
index 0000000..7bf1671
--- /dev/null
+++ b/include/os/linux/ioctl.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+#ifndef __NVGPU_IOCTL_H__
+#define __NVGPU_IOCTL_H__
+
+struct device;
+struct class;
+
+int gk20a_user_init(struct device *dev, const char *interface_name,
+                    struct class *class);
+void gk20a_user_deinit(struct device *dev, struct class *class);
+
+#endif
diff --git a/include/os/linux/ioctl_as.c b/include/os/linux/ioctl_as.c
new file mode 100644
index 0000000..f0cec17
--- /dev/null
+++ b/include/os/linux/ioctl_as.c
@@ -0,0 +1,427 @@
+/*
+ * GK20A Address Spaces
+ *
+ * Copyright (c) 2011-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/cdev.h>
+#include <linux/uaccess.h>
+#include <linux/fs.h>
+
+#include <trace/events/gk20a.h>
+
+#include <uapi/linux/nvgpu.h>
+
+#include <nvgpu/gmmu.h>
+#include <nvgpu/vm_area.h>
+#include <nvgpu/log2.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/channel.h>
+
+#include <nvgpu/linux/vm.h>
+
+#include "platform_gk20a.h"
+#include "ioctl_as.h"
+#include "os_linux.h"
+
+static u32 gk20a_as_translate_as_alloc_space_flags(struct gk20a *g, u32 flags)
+{
+        u32 core_flags = 0;
+
+        if (flags & NVGPU_AS_ALLOC_SPACE_FLAGS_FIXED_OFFSET)
+                core_flags |= NVGPU_VM_AREA_ALLOC_FIXED_OFFSET;
+        if (flags & NVGPU_AS_ALLOC_SPACE_FLAGS_SPARSE)
+                core_flags |= NVGPU_VM_AREA_ALLOC_SPARSE;
+
+        return core_flags;
+}
+
+static int gk20a_as_ioctl_bind_channel(
+                struct gk20a_as_share *as_share,
+                struct nvgpu_as_bind_channel_args *args)
+{
+        int err = 0;
+        struct channel_gk20a *ch;
+        struct gk20a *g = gk20a_from_vm(as_share->vm);
+
+        nvgpu_log_fn(g, " ");
+
+        ch = gk20a_get_channel_from_file(args->channel_fd);
+        if (!ch)
+                return -EINVAL;
+
+        if (gk20a_channel_as_bound(ch)) {
+                err = -EINVAL;
+                goto out;
+        }
+
+        /* this will set channel_gk20a->vm */
+        err = ch->g->ops.mm.vm_bind_channel(as_share->vm, ch);
+
+out:
+        gk20a_channel_put(ch);
+        return err;
+}
+
+static int gk20a_as_ioctl_alloc_space(
+                struct gk20a_as_share *as_share,
+                struct nvgpu_as_alloc_space_args *args)
+{
+        struct gk20a *g = gk20a_from_vm(as_share->vm);
+
+        nvgpu_log_fn(g, " ");
+        return nvgpu_vm_area_alloc(as_share->vm, args->pages, args->page_size,
+                                   &args->o_a.offset,
+                                   gk20a_as_translate_as_alloc_space_flags(g,
+                                                                args->flags));
+}
+
+static int gk20a_as_ioctl_free_space(
+                struct gk20a_as_share *as_share,
+                struct nvgpu_as_free_space_args *args)
+{
+        struct gk20a *g = gk20a_from_vm(as_share->vm);
+
+        nvgpu_log_fn(g, " ");
+        return nvgpu_vm_area_free(as_share->vm, args->offset);
+}
+
+static int gk20a_as_ioctl_map_buffer_ex(
+                struct gk20a_as_share *as_share,
+                struct nvgpu_as_map_buffer_ex_args *args)
+{
+        struct gk20a *g = gk20a_from_vm(as_share->vm);
+
+        nvgpu_log_fn(g, " ");
+
+        /* unsupported, direct kind control must be used */
+        if (!(args->flags & NVGPU_AS_MAP_BUFFER_FLAGS_DIRECT_KIND_CTRL)) {
+                struct gk20a *g = as_share->vm->mm->g;
+                nvgpu_log_info(g, "Direct kind control must be requested");
+                return -EINVAL;
+        }
+
+        return nvgpu_vm_map_buffer(as_share->vm, args->dmabuf_fd,
+                                   &args->offset, args->flags,
+                                   args->page_size,
+                                   args->compr_kind,
+                                   args->incompr_kind,
+                                   args->buffer_offset,
+                                   args->mapping_size,
+                                   NULL);
+}
+
+static int gk20a_as_ioctl_unmap_buffer(
+                struct gk20a_as_share *as_share,
+                struct nvgpu_as_unmap_buffer_args *args)
+{
+        struct gk20a *g = gk20a_from_vm(as_share->vm);
+
+        nvgpu_log_fn(g, " ");
+
+        nvgpu_vm_unmap(as_share->vm, args->offset, NULL);
+
+        return 0;
+}
+
+static int gk20a_as_ioctl_map_buffer_batch(
+        struct gk20a_as_share *as_share,
+        struct nvgpu_as_map_buffer_batch_args *args)
+{
+        struct gk20a *g = gk20a_from_vm(as_share->vm);
+        u32 i;
+        int err = 0;
+
+        struct nvgpu_as_unmap_buffer_args __user *user_unmap_args =
+                (struct nvgpu_as_unmap_buffer_args __user *)(uintptr_t)
+                args->unmaps;
+        struct nvgpu_as_map_buffer_ex_args __user *user_map_args =
+                (struct nvgpu_as_map_buffer_ex_args __user *)(uintptr_t)
+                args->maps;
+
+        struct vm_gk20a_mapping_batch batch;
+
+        nvgpu_log_fn(g, " ");
+
+        if (args->num_unmaps > NVGPU_IOCTL_AS_MAP_BUFFER_BATCH_LIMIT ||
+            args->num_maps > NVGPU_IOCTL_AS_MAP_BUFFER_BATCH_LIMIT)
+                return -EINVAL;
+
+        nvgpu_vm_mapping_batch_start(&batch);
+
+        for (i = 0; i < args->num_unmaps; ++i) {
+                struct nvgpu_as_unmap_buffer_args unmap_args;
+
+                if (copy_from_user(&unmap_args, &user_unmap_args[i],
+                                   sizeof(unmap_args))) {
+                        err = -EFAULT;
+                        break;
+                }
+
+                nvgpu_vm_unmap(as_share->vm, unmap_args.offset, &batch);
+        }
+
+        nvgpu_speculation_barrier();
+        if (err) {
+                nvgpu_vm_mapping_batch_finish(as_share->vm, &batch);
+
+                args->num_unmaps = i;
+                args->num_maps = 0;
+                return err;
+        }
+
+        for (i = 0; i < args->num_maps; ++i) {
+                s16 compressible_kind;
+                s16 incompressible_kind;
+
+                struct nvgpu_as_map_buffer_ex_args map_args;
+                memset(&map_args, 0, sizeof(map_args));
+
+                if (copy_from_user(&map_args, &user_map_args[i],
+                                   sizeof(map_args))) {
+                        err = -EFAULT;
+                        break;
+                }
+
+                if (map_args.flags &
+                    NVGPU_AS_MAP_BUFFER_FLAGS_DIRECT_KIND_CTRL) {
+                        compressible_kind = map_args.compr_kind;
+                        incompressible_kind = map_args.incompr_kind;
+                } else {
+                        /* direct kind control must be used */
+                        err = -EINVAL;
+                        break;
+                }
+
+                err = nvgpu_vm_map_buffer(
+                        as_share->vm, map_args.dmabuf_fd,
+                        &map_args.offset, map_args.flags, map_args.page_size,
+                        compressible_kind, incompressible_kind,
+                        map_args.buffer_offset,
+                        map_args.mapping_size,
+                        &batch);
+                if (err)
+                        break;
+        }
+
+        nvgpu_vm_mapping_batch_finish(as_share->vm, &batch);
+
+        if (err)
+                args->num_maps = i;
+        /* note: args->num_unmaps will be unmodified, which is ok
+         * since all unmaps are done */
+
+        return err;
+}
+
+static int gk20a_as_ioctl_get_va_regions(
+                struct gk20a_as_share *as_share,
+                struct nvgpu_as_get_va_regions_args *args)
+{
+        unsigned int i;
+        unsigned int write_entries;
+        struct nvgpu_as_va_region __user *user_region_ptr;
+        struct vm_gk20a *vm = as_share->vm;
+        struct gk20a *g = gk20a_from_vm(vm);
+        unsigned int page_sizes = GMMU_PAGE_SIZE_KERNEL;
+
+        nvgpu_log_fn(g, " ");
+
+        if (!vm->big_pages)
+                page_sizes--;
+
+        write_entries = args->buf_size / sizeof(struct nvgpu_as_va_region);
+        if (write_entries > page_sizes)
+                write_entries = page_sizes;
+
+        user_region_ptr =
+                (struct nvgpu_as_va_region __user *)(uintptr_t)args->buf_addr;
+
+        for (i = 0; i < write_entries; ++i) {
+                struct nvgpu_as_va_region region;
+                struct nvgpu_allocator *vma = vm->vma[i];
+
+                memset(&region, 0, sizeof(struct nvgpu_as_va_region));
+
+                region.page_size = vm->gmmu_page_sizes[i];
+                region.offset = nvgpu_alloc_base(vma);
+                /* No __aeabi_uldivmod() on some platforms... */
+                region.pages = (nvgpu_alloc_end(vma) -
+                        nvgpu_alloc_base(vma)) >> ilog2(region.page_size);
+
+                if (copy_to_user(user_region_ptr + i, &region, sizeof(region)))
+                        return -EFAULT;
+        }
+
+        args->buf_size =
+                page_sizes * sizeof(struct nvgpu_as_va_region);
+
+        return 0;
+}
+
+static int nvgpu_as_ioctl_get_sync_ro_map(
+        struct gk20a_as_share *as_share,
+        struct nvgpu_as_get_sync_ro_map_args *args)
+{
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        struct vm_gk20a *vm = as_share->vm;
+        struct gk20a *g = gk20a_from_vm(vm);
+        u64 base_gpuva;
+        u32 sync_size;
+        int err = 0;
+
+        if (!g->ops.fifo.get_sync_ro_map)
+                return -EINVAL;
+
+        if (!nvgpu_has_syncpoints(g))
+                return -EINVAL;
+
+        err = g->ops.fifo.get_sync_ro_map(vm, &base_gpuva, &sync_size);
+        if (err)
+                return err;
+
+        args->base_gpuva = base_gpuva;
+        args->sync_size = sync_size;
+
+        return err;
+#else
+        return -EINVAL;
+#endif
+}
+
+int gk20a_as_dev_open(struct inode *inode, struct file *filp)
+{
+        struct nvgpu_os_linux *l;
+        struct gk20a_as_share *as_share;
+        struct gk20a *g;
+        int err;
+
+        l = container_of(inode->i_cdev, struct nvgpu_os_linux, as_dev.cdev);
+        g = &l->g;
+
+        nvgpu_log_fn(g, " ");
+
+        err = gk20a_as_alloc_share(g, 0, 0, &as_share);
+        if (err) {
+                nvgpu_log_fn(g, "failed to alloc share");
+                return err;
+        }
+
+        filp->private_data = as_share;
+        return 0;
+}
+
+int gk20a_as_dev_release(struct inode *inode, struct file *filp)
+{
+        struct gk20a_as_share *as_share = filp->private_data;
+
+        if (!as_share)
+                return 0;
+
+        return gk20a_as_release_share(as_share);
+}
+
+long gk20a_as_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+        int err = 0;
+        struct gk20a_as_share *as_share = filp->private_data;
+        struct gk20a *g = gk20a_from_as(as_share->as);
+
+        u8 buf[NVGPU_AS_IOCTL_MAX_ARG_SIZE];
+
+        nvgpu_log_fn(g, "start %d", _IOC_NR(cmd));
+
+        if ((_IOC_TYPE(cmd) != NVGPU_AS_IOCTL_MAGIC) ||
+                (_IOC_NR(cmd) == 0) ||
+                (_IOC_NR(cmd) > NVGPU_AS_IOCTL_LAST) ||
+                (_IOC_SIZE(cmd) > NVGPU_AS_IOCTL_MAX_ARG_SIZE))
+                return -EINVAL;
+
+        memset(buf, 0, sizeof(buf));
+        if (_IOC_DIR(cmd) & _IOC_WRITE) {
+                if (copy_from_user(buf, (void __user *)arg, _IOC_SIZE(cmd)))
+                        return -EFAULT;
+        }
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        nvgpu_speculation_barrier();
+        switch (cmd) {
+        case NVGPU_AS_IOCTL_BIND_CHANNEL:
+                trace_gk20a_as_ioctl_bind_channel(g->name);
+                err = gk20a_as_ioctl_bind_channel(as_share,
+                               (struct nvgpu_as_bind_channel_args *)buf);
+
+                break;
+        case NVGPU32_AS_IOCTL_ALLOC_SPACE:
+        {
+                struct nvgpu32_as_alloc_space_args *args32 =
+                        (struct nvgpu32_as_alloc_space_args *)buf;
+                struct nvgpu_as_alloc_space_args args;
+
+                args.pages = args32->pages;
+                args.page_size = args32->page_size;
+                args.flags = args32->flags;
+                args.o_a.offset = args32->o_a.offset;
+                trace_gk20a_as_ioctl_alloc_space(g->name);
+                err = gk20a_as_ioctl_alloc_space(as_share, &args);
+                args32->o_a.offset = args.o_a.offset;
+                break;
+        }
+        case NVGPU_AS_IOCTL_ALLOC_SPACE:
+                trace_gk20a_as_ioctl_alloc_space(g->name);
+                err = gk20a_as_ioctl_alloc_space(as_share,
+                                (struct nvgpu_as_alloc_space_args *)buf);
+                break;
+        case NVGPU_AS_IOCTL_FREE_SPACE:
+                trace_gk20a_as_ioctl_free_space(g->name);
+                err = gk20a_as_ioctl_free_space(as_share,
+                                (struct nvgpu_as_free_space_args *)buf);
+                break;
+        case NVGPU_AS_IOCTL_MAP_BUFFER_EX:
+                trace_gk20a_as_ioctl_map_buffer(g->name);
+                err = gk20a_as_ioctl_map_buffer_ex(as_share,
+                                (struct nvgpu_as_map_buffer_ex_args *)buf);
+                break;
+        case NVGPU_AS_IOCTL_UNMAP_BUFFER:
+                trace_gk20a_as_ioctl_unmap_buffer(g->name);
+                err = gk20a_as_ioctl_unmap_buffer(as_share,
+                                (struct nvgpu_as_unmap_buffer_args *)buf);
+                break;
+        case NVGPU_AS_IOCTL_GET_VA_REGIONS:
+                trace_gk20a_as_ioctl_get_va_regions(g->name);
+                err = gk20a_as_ioctl_get_va_regions(as_share,
+                                (struct nvgpu_as_get_va_regions_args *)buf);
+                break;
+        case NVGPU_AS_IOCTL_MAP_BUFFER_BATCH:
+                err = gk20a_as_ioctl_map_buffer_batch(as_share,
+                                (struct nvgpu_as_map_buffer_batch_args *)buf);
+                break;
+        case NVGPU_AS_IOCTL_GET_SYNC_RO_MAP:
+                err = nvgpu_as_ioctl_get_sync_ro_map(as_share,
+                        (struct nvgpu_as_get_sync_ro_map_args *)buf);
+                break;
+        default:
+                err = -ENOTTY;
+                break;
+        }
+
+        gk20a_idle(g);
+
+        if ((err == 0) && (_IOC_DIR(cmd) & _IOC_READ))
+                if (copy_to_user((void __user *)arg, buf, _IOC_SIZE(cmd)))
+                        err = -EFAULT;
+
+        return err;
+}
diff --git a/include/os/linux/ioctl_as.h b/include/os/linux/ioctl_as.h
new file mode 100644
index 0000000..b3de378
--- /dev/null
+++ b/include/os/linux/ioctl_as.h
@@ -0,0 +1,30 @@
+/*
+ * GK20A Address Spaces
+ *
+ * Copyright (c) 2011-2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+#ifndef __NVGPU_COMMON_LINUX_AS_H__
+#define __NVGPU_COMMON_LINUX_AS_H__
+
+struct inode;
+struct file;
+
+/* MAP_BUFFER_BATCH_LIMIT: the upper limit for num_unmaps and
+ * num_maps */
+#define NVGPU_IOCTL_AS_MAP_BUFFER_BATCH_LIMIT   256
+
+/* struct file_operations driver interface */
+int gk20a_as_dev_open(struct inode *inode, struct file *filp);
+int gk20a_as_dev_release(struct inode *inode, struct file *filp);
+long gk20a_as_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+
+#endif
diff --git a/include/os/linux/ioctl_channel.c b/include/os/linux/ioctl_channel.c
new file mode 100644
index 0000000..0f39cc7
--- /dev/null
+++ b/include/os/linux/ioctl_channel.c
@@ -0,0 +1,1388 @@
+/*
+ * GK20A Graphics channel
+ *
+ * Copyright (c) 2011-2020, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <trace/events/gk20a.h>
+#include <linux/file.h>
+#include <linux/anon_inodes.h>
+#include <linux/dma-buf.h>
+#include <linux/poll.h>
+#include <uapi/linux/nvgpu.h>
+
+#include <nvgpu/semaphore.h>
+#include <nvgpu/timers.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/log.h>
+#include <nvgpu/list.h>
+#include <nvgpu/debug.h>
+#include <nvgpu/enabled.h>
+#include <nvgpu/error_notifier.h>
+#include <nvgpu/barrier.h>
+#include <nvgpu/nvhost.h>
+#include <nvgpu/os_sched.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/channel.h>
+#include <nvgpu/channel_sync.h>
+
+#include "gk20a/dbg_gpu_gk20a.h"
+#include "gk20a/fence_gk20a.h"
+
+#include "platform_gk20a.h"
+#include "ioctl_channel.h"
+#include "channel.h"
+#include "os_linux.h"
+#include "ctxsw_trace.h"
+
+/* the minimal size of client buffer */
+#define CSS_MIN_CLIENT_SNAPSHOT_SIZE                            \
+                (sizeof(struct gk20a_cs_snapshot_fifo) +        \
+                sizeof(struct gk20a_cs_snapshot_fifo_entry) * 256)
+
+static const char *gr_gk20a_graphics_preempt_mode_name(u32 graphics_preempt_mode)
+{
+        switch (graphics_preempt_mode) {
+        case NVGPU_PREEMPTION_MODE_GRAPHICS_WFI:
+                return "WFI";
+        default:
+                return "?";
+        }
+}
+
+static const char *gr_gk20a_compute_preempt_mode_name(u32 compute_preempt_mode)
+{
+        switch (compute_preempt_mode) {
+        case NVGPU_PREEMPTION_MODE_COMPUTE_WFI:
+                return "WFI";
+        case NVGPU_PREEMPTION_MODE_COMPUTE_CTA:
+                return "CTA";
+        default:
+                return "?";
+        }
+}
+
+static void gk20a_channel_trace_sched_param(
+        void (*trace)(int chid, int tsgid, pid_t pid, u32 timeslice,
+                u32 timeout, const char *interleave,
+                const char *graphics_preempt_mode,
+                const char *compute_preempt_mode),
+        struct channel_gk20a *ch)
+{
+        struct tsg_gk20a *tsg = tsg_gk20a_from_ch(ch);
+
+        if (!tsg)
+                return;
+
+        (trace)(ch->chid, ch->tsgid, ch->pid,
+                tsg_gk20a_from_ch(ch)->timeslice_us,
+                ch->timeout_ms_max,
+                gk20a_fifo_interleave_level_name(tsg->interleave_level),
+                gr_gk20a_graphics_preempt_mode_name(
+                        tsg->gr_ctx.graphics_preempt_mode),
+                gr_gk20a_compute_preempt_mode_name(
+                        tsg->gr_ctx.compute_preempt_mode));
+}
+
+/*
+ * Although channels do have pointers back to the gk20a struct that they were
+ * created under in cases where the driver is killed that pointer can be bad.
+ * The channel memory can be freed before the release() function for a given
+ * channel is called. This happens when the driver dies and userspace doesn't
+ * get a chance to call release() until after the entire gk20a driver data is
+ * unloaded and freed.
+ */
+struct channel_priv {
+        struct gk20a *g;
+        struct channel_gk20a *c;
+};
+
+#if defined(CONFIG_GK20A_CYCLE_STATS)
+
+void gk20a_channel_free_cycle_stats_buffer(struct channel_gk20a *ch)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+
+        /* disable existing cyclestats buffer */
+        nvgpu_mutex_acquire(&ch->cyclestate.cyclestate_buffer_mutex);
+        if (priv->cyclestate_buffer_handler) {
+                dma_buf_vunmap(priv->cyclestate_buffer_handler,
+                                ch->cyclestate.cyclestate_buffer);
+                dma_buf_put(priv->cyclestate_buffer_handler);
+                priv->cyclestate_buffer_handler = NULL;
+                ch->cyclestate.cyclestate_buffer = NULL;
+                ch->cyclestate.cyclestate_buffer_size = 0;
+        }
+        nvgpu_mutex_release(&ch->cyclestate.cyclestate_buffer_mutex);
+}
+
+int gk20a_channel_cycle_stats(struct channel_gk20a *ch, int dmabuf_fd)
+{
+        struct dma_buf *dmabuf;
+        void *virtual_address;
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+
+        /* is it allowed to handle calls for current GPU? */
+        if (!nvgpu_is_enabled(ch->g, NVGPU_SUPPORT_CYCLE_STATS))
+                return -ENOSYS;
+
+        if (dmabuf_fd && !priv->cyclestate_buffer_handler) {
+
+                /* set up new cyclestats buffer */
+                dmabuf = dma_buf_get(dmabuf_fd);
+                if (IS_ERR(dmabuf))
+                        return PTR_ERR(dmabuf);
+                virtual_address = dma_buf_vmap(dmabuf);
+                if (!virtual_address)
+                        return -ENOMEM;
+
+                priv->cyclestate_buffer_handler = dmabuf;
+                ch->cyclestate.cyclestate_buffer = virtual_address;
+                ch->cyclestate.cyclestate_buffer_size = dmabuf->size;
+                return 0;
+
+        } else if (!dmabuf_fd && priv->cyclestate_buffer_handler) {
+                gk20a_channel_free_cycle_stats_buffer(ch);
+                return 0;
+
+        } else if (!dmabuf_fd && !priv->cyclestate_buffer_handler) {
+                /* no request from GL */
+                return 0;
+
+        } else {
+                pr_err("channel already has cyclestats buffer\n");
+                return -EINVAL;
+        }
+}
+
+int gk20a_flush_cycle_stats_snapshot(struct channel_gk20a *ch)
+{
+        int ret;
+
+        nvgpu_mutex_acquire(&ch->cs_client_mutex);
+        if (ch->cs_client)
+                ret = gr_gk20a_css_flush(ch, ch->cs_client);
+        else
+                ret = -EBADF;
+        nvgpu_mutex_release(&ch->cs_client_mutex);
+
+        return ret;
+}
+
+int gk20a_attach_cycle_stats_snapshot(struct channel_gk20a *ch,
+                                u32 dmabuf_fd,
+                                u32 perfmon_id_count,
+                                u32 *perfmon_id_start)
+{
+        int ret = 0;
+        struct gk20a *g = ch->g;
+        struct gk20a_cs_snapshot_client_linux *client_linux;
+        struct gk20a_cs_snapshot_client *client;
+
+        nvgpu_mutex_acquire(&ch->cs_client_mutex);
+        if (ch->cs_client) {
+                nvgpu_mutex_release(&ch->cs_client_mutex);
+                return -EEXIST;
+        }
+
+        client_linux = nvgpu_kzalloc(g, sizeof(*client_linux));
+        if (!client_linux) {
+                ret = -ENOMEM;
+                goto err;
+        }
+
+        client_linux->dmabuf_fd   = dmabuf_fd;
+        client_linux->dma_handler = dma_buf_get(client_linux->dmabuf_fd);
+        if (IS_ERR(client_linux->dma_handler)) {
+                ret = PTR_ERR(client_linux->dma_handler);
+                client_linux->dma_handler = NULL;
+                goto err_free;
+        }
+
+        client = &client_linux->cs_client;
+        client->snapshot_size = client_linux->dma_handler->size;
+        if (client->snapshot_size < CSS_MIN_CLIENT_SNAPSHOT_SIZE) {
+                ret = -ENOMEM;
+                goto err_put;
+        }
+
+        client->snapshot = (struct gk20a_cs_snapshot_fifo *)
+                                        dma_buf_vmap(client_linux->dma_handler);
+        if (!client->snapshot) {
+                ret = -ENOMEM;
+                goto err_put;
+        }
+
+        ch->cs_client = client;
+
+        ret = gr_gk20a_css_attach(ch,
+                                perfmon_id_count,
+                                perfmon_id_start,
+                                ch->cs_client);
+
+        nvgpu_mutex_release(&ch->cs_client_mutex);
+
+        return ret;
+
+err_put:
+        dma_buf_put(client_linux->dma_handler);
+err_free:
+        nvgpu_kfree(g, client_linux);
+err:
+        nvgpu_mutex_release(&ch->cs_client_mutex);
+        return ret;
+}
+
+int gk20a_channel_free_cycle_stats_snapshot(struct channel_gk20a *ch)
+{
+        int ret;
+        struct gk20a_cs_snapshot_client_linux *client_linux;
+
+        nvgpu_mutex_acquire(&ch->cs_client_mutex);
+        if (!ch->cs_client) {
+                nvgpu_mutex_release(&ch->cs_client_mutex);
+                return 0;
+        }
+
+        client_linux = container_of(ch->cs_client,
+                                struct gk20a_cs_snapshot_client_linux,
+                                cs_client);
+
+        ret = gr_gk20a_css_detach(ch, ch->cs_client);
+
+        if (client_linux->dma_handler) {
+                if (ch->cs_client->snapshot)
+                        dma_buf_vunmap(client_linux->dma_handler,
+                                        ch->cs_client->snapshot);
+                dma_buf_put(client_linux->dma_handler);
+        }
+
+        ch->cs_client = NULL;
+        nvgpu_kfree(ch->g, client_linux);
+
+        nvgpu_mutex_release(&ch->cs_client_mutex);
+
+        return ret;
+}
+#endif
+
+static int gk20a_channel_set_wdt_status(struct channel_gk20a *ch,
+                struct nvgpu_channel_wdt_args *args)
+{
+        u32 status = args->wdt_status & (NVGPU_IOCTL_CHANNEL_DISABLE_WDT |
+                        NVGPU_IOCTL_CHANNEL_ENABLE_WDT);
+
+        if (status == NVGPU_IOCTL_CHANNEL_DISABLE_WDT)
+                ch->timeout.enabled = false;
+        else if (status == NVGPU_IOCTL_CHANNEL_ENABLE_WDT)
+                ch->timeout.enabled = true;
+        else
+                return -EINVAL;
+
+        if (args->wdt_status & NVGPU_IOCTL_CHANNEL_WDT_FLAG_SET_TIMEOUT)
+                ch->timeout.limit_ms = args->timeout_ms;
+
+        ch->timeout.debug_dump = (args->wdt_status &
+                        NVGPU_IOCTL_CHANNEL_WDT_FLAG_DISABLE_DUMP) == 0;
+
+        return 0;
+}
+
+static void gk20a_channel_free_error_notifiers(struct channel_gk20a *ch)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+
+        nvgpu_mutex_acquire(&priv->error_notifier.mutex);
+        if (priv->error_notifier.dmabuf) {
+                dma_buf_vunmap(priv->error_notifier.dmabuf, priv->error_notifier.vaddr);
+                dma_buf_put(priv->error_notifier.dmabuf);
+                priv->error_notifier.dmabuf = NULL;
+                priv->error_notifier.notification = NULL;
+                priv->error_notifier.vaddr = NULL;
+        }
+        nvgpu_mutex_release(&priv->error_notifier.mutex);
+}
+
+static int gk20a_init_error_notifier(struct channel_gk20a *ch,
+                struct nvgpu_set_error_notifier *args)
+{
+        struct dma_buf *dmabuf;
+        void *va;
+        u64 end = args->offset + sizeof(struct nvgpu_notification);
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+
+        if (!args->mem) {
+                pr_err("gk20a_init_error_notifier: invalid memory handle\n");
+                return -EINVAL;
+        }
+
+        dmabuf = dma_buf_get(args->mem);
+
+        gk20a_channel_free_error_notifiers(ch);
+
+        if (IS_ERR(dmabuf)) {
+                pr_err("Invalid handle: %d\n", args->mem);
+                return -EINVAL;
+        }
+
+        if (end > dmabuf->size || end < sizeof(struct nvgpu_notification)) {
+                dma_buf_put(dmabuf);
+                nvgpu_err(ch->g, "gk20a_init_error_notifier: invalid offset");
+                return -EINVAL;
+        }
+
+        nvgpu_speculation_barrier();
+
+        /* map handle */
+        va = dma_buf_vmap(dmabuf);
+        if (!va) {
+                dma_buf_put(dmabuf);
+                pr_err("Cannot map notifier handle\n");
+                return -ENOMEM;
+        }
+
+        priv->error_notifier.notification = va + args->offset;
+        priv->error_notifier.vaddr = va;
+        memset(priv->error_notifier.notification, 0,
+                sizeof(struct nvgpu_notification));
+
+        /* set channel notifiers pointer */
+        nvgpu_mutex_acquire(&priv->error_notifier.mutex);
+        priv->error_notifier.dmabuf = dmabuf;
+        nvgpu_mutex_release(&priv->error_notifier.mutex);
+
+        return 0;
+}
+
+/*
+ * This returns the channel with a reference. The caller must
+ * gk20a_channel_put() the ref back after use.
+ *
+ * NULL is returned if the channel was not found.
+ */
+struct channel_gk20a *gk20a_get_channel_from_file(int fd)
+{
+        struct channel_gk20a *ch;
+        struct channel_priv *priv;
+        struct file *f = fget(fd);
+
+        if (!f)
+                return NULL;
+
+        if (f->f_op != &gk20a_channel_ops) {
+                fput(f);
+                return NULL;
+        }
+
+        priv = (struct channel_priv *)f->private_data;
+        ch = gk20a_channel_get(priv->c);
+        fput(f);
+        return ch;
+}
+
+int gk20a_channel_release(struct inode *inode, struct file *filp)
+{
+        struct channel_priv *priv = filp->private_data;
+        struct channel_gk20a *ch;
+        struct gk20a *g;
+
+        int err;
+
+        /* We could still end up here even if the channel_open failed, e.g.
+         * if we ran out of hw channel IDs.
+         */
+        if (!priv)
+                return 0;
+
+        ch = priv->c;
+        g = priv->g;
+
+        err = gk20a_busy(g);
+        if (err) {
+                nvgpu_err(g, "failed to release a channel!");
+                goto channel_release;
+        }
+
+        trace_gk20a_channel_release(dev_name(dev_from_gk20a(g)));
+
+        gk20a_channel_close(ch);
+        gk20a_channel_free_error_notifiers(ch);
+
+        gk20a_idle(g);
+
+channel_release:
+        gk20a_put(g);
+        nvgpu_kfree(g, filp->private_data);
+        filp->private_data = NULL;
+        return 0;
+}
+
+/* note: runlist_id -1 is synonym for the ENGINE_GR_GK20A runlist id */
+static int __gk20a_channel_open(struct gk20a *g,
+                                struct file *filp, s32 runlist_id)
+{
+        int err;
+        struct channel_gk20a *ch;
+        struct channel_priv *priv;
+
+        nvgpu_log_fn(g, " ");
+
+        g = gk20a_get(g);
+        if (!g)
+                return -ENODEV;
+
+        trace_gk20a_channel_open(dev_name(dev_from_gk20a(g)));
+
+        priv = nvgpu_kzalloc(g, sizeof(*priv));
+        if (!priv) {
+                err = -ENOMEM;
+                goto free_ref;
+        }
+
+        err = gk20a_busy(g);
+        if (err) {
+                nvgpu_err(g, "failed to power on, %d", err);
+                goto fail_busy;
+        }
+        /* All the user space channel should be non privilege */
+        ch = gk20a_open_new_channel(g, runlist_id, false,
+                                nvgpu_current_pid(g), nvgpu_current_tid(g));
+        gk20a_idle(g);
+        if (!ch) {
+                nvgpu_err(g,
+                        "failed to get f");
+                err = -ENOMEM;
+                goto fail_busy;
+        }
+
+        gk20a_channel_trace_sched_param(
+                trace_gk20a_channel_sched_defaults, ch);
+
+        priv->g = g;
+        priv->c = ch;
+
+        filp->private_data = priv;
+        return 0;
+
+fail_busy:
+        nvgpu_kfree(g, priv);
+free_ref:
+        gk20a_put(g);
+        return err;
+}
+
+int gk20a_channel_open(struct inode *inode, struct file *filp)
+{
+        struct nvgpu_os_linux *l = container_of(inode->i_cdev,
+                        struct nvgpu_os_linux, channel.cdev);
+        struct gk20a *g = &l->g;
+        int ret;
+
+        nvgpu_log_fn(g, "start");
+        ret = __gk20a_channel_open(g, filp, -1);
+
+        nvgpu_log_fn(g, "end");
+        return ret;
+}
+
+int gk20a_channel_open_ioctl(struct gk20a *g,
+                struct nvgpu_channel_open_args *args)
+{
+        int err;
+        int fd;
+        struct file *file;
+        char name[64];
+        s32 runlist_id = args->in.runlist_id;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        err = get_unused_fd_flags(O_RDWR);
+        if (err < 0)
+                return err;
+        fd = err;
+
+        snprintf(name, sizeof(name), "nvhost-%s-fd%d",
+                 dev_name(dev_from_gk20a(g)), fd);
+
+        file = anon_inode_getfile(name, l->channel.cdev.ops, NULL, O_RDWR);
+        if (IS_ERR(file)) {
+                err = PTR_ERR(file);
+                goto clean_up;
+        }
+
+        err = __gk20a_channel_open(g, file, runlist_id);
+        if (err)
+                goto clean_up_file;
+
+        fd_install(fd, file);
+        args->out.channel_fd = fd;
+        return 0;
+
+clean_up_file:
+        fput(file);
+clean_up:
+        put_unused_fd(fd);
+        return err;
+}
+
+static u32 nvgpu_setup_bind_user_flags_to_common_flags(u32 user_flags)
+{
+        u32 flags = 0;
+
+        if (user_flags & NVGPU_CHANNEL_SETUP_BIND_FLAGS_VPR_ENABLED)
+                flags |= NVGPU_SETUP_BIND_FLAGS_SUPPORT_VPR;
+
+        if (user_flags & NVGPU_CHANNEL_SETUP_BIND_FLAGS_DETERMINISTIC)
+                flags |= NVGPU_SETUP_BIND_FLAGS_SUPPORT_DETERMINISTIC;
+
+        if (user_flags & NVGPU_CHANNEL_SETUP_BIND_FLAGS_REPLAYABLE_FAULTS_ENABLE)
+                flags |= NVGPU_SETUP_BIND_FLAGS_REPLAYABLE_FAULTS_ENABLE;
+
+        if (user_flags & NVGPU_CHANNEL_SETUP_BIND_FLAGS_USERMODE_SUPPORT)
+                flags |= NVGPU_SETUP_BIND_FLAGS_USERMODE_SUPPORT;
+
+        return flags;
+}
+
+static void nvgpu_get_setup_bind_args(
+                struct nvgpu_channel_setup_bind_args *channel_setup_bind_args,
+                struct nvgpu_setup_bind_args *setup_bind_args)
+{
+        setup_bind_args->num_gpfifo_entries =
+                channel_setup_bind_args->num_gpfifo_entries;
+        setup_bind_args->num_inflight_jobs =
+                channel_setup_bind_args->num_inflight_jobs;
+        setup_bind_args->userd_dmabuf_fd =
+                channel_setup_bind_args->userd_dmabuf_fd;
+        setup_bind_args->userd_dmabuf_offset =
+                channel_setup_bind_args->userd_dmabuf_offset;
+        setup_bind_args->gpfifo_dmabuf_fd =
+                channel_setup_bind_args->gpfifo_dmabuf_fd;
+        setup_bind_args->gpfifo_dmabuf_offset =
+                channel_setup_bind_args->gpfifo_dmabuf_offset;
+        setup_bind_args->flags = nvgpu_setup_bind_user_flags_to_common_flags(
+                        channel_setup_bind_args->flags);
+}
+
+static void nvgpu_get_gpfifo_ex_args(
+                struct nvgpu_alloc_gpfifo_ex_args *alloc_gpfifo_ex_args,
+                struct nvgpu_setup_bind_args *setup_bind_args)
+{
+        setup_bind_args->num_gpfifo_entries = alloc_gpfifo_ex_args->num_entries;
+        setup_bind_args->num_inflight_jobs =
+                alloc_gpfifo_ex_args->num_inflight_jobs;
+        setup_bind_args->flags = nvgpu_setup_bind_user_flags_to_common_flags(
+                        alloc_gpfifo_ex_args->flags);
+}
+
+static void nvgpu_get_gpfifo_args(
+                struct nvgpu_alloc_gpfifo_args *alloc_gpfifo_args,
+                struct nvgpu_setup_bind_args *setup_bind_args)
+{
+        /*
+         * Kernel can insert one extra gpfifo entry before user
+         * submitted gpfifos and another one after, for internal usage.
+         * Triple the requested size.
+         */
+        setup_bind_args->num_gpfifo_entries =
+                alloc_gpfifo_args->num_entries * 3;
+        setup_bind_args->num_inflight_jobs = 0;
+        setup_bind_args->flags = nvgpu_setup_bind_user_flags_to_common_flags(
+                        alloc_gpfifo_args->flags);
+}
+
+static void nvgpu_get_fence_args(
+                struct nvgpu_fence *fence_args_in,
+                struct nvgpu_channel_fence *fence_args_out)
+{
+        fence_args_out->id = fence_args_in->id;
+        fence_args_out->value = fence_args_in->value;
+}
+
+static int gk20a_channel_wait_semaphore(struct channel_gk20a *ch,
+                                        ulong id, u32 offset,
+                                        u32 payload, u32 timeout)
+{
+        struct dma_buf *dmabuf;
+        void *data;
+        u32 *semaphore;
+        int ret = 0;
+
+        /* do not wait if channel has timed out */
+        if (gk20a_channel_check_timedout(ch)) {
+                return -ETIMEDOUT;
+        }
+
+        dmabuf = dma_buf_get(id);
+        if (IS_ERR(dmabuf)) {
+                nvgpu_err(ch->g, "invalid notifier nvmap handle 0x%lx", id);
+                return -EINVAL;
+        }
+
+        data = dma_buf_kmap(dmabuf, offset >> PAGE_SHIFT);
+        if (!data) {
+                nvgpu_err(ch->g, "failed to map notifier memory");
+                ret = -EINVAL;
+                goto cleanup_put;
+        }
+
+        semaphore = data + (offset & ~PAGE_MASK);
+
+        ret = NVGPU_COND_WAIT_INTERRUPTIBLE(
+                        &ch->semaphore_wq,
+                        *semaphore == payload ||
+                        gk20a_channel_check_timedout(ch),
+                        timeout);
+
+        dma_buf_kunmap(dmabuf, offset >> PAGE_SHIFT, data);
+cleanup_put:
+        dma_buf_put(dmabuf);
+        return ret;
+}
+
+static int gk20a_channel_wait(struct channel_gk20a *ch,
+                              struct nvgpu_wait_args *args)
+{
+        struct dma_buf *dmabuf;
+        struct gk20a *g = ch->g;
+        struct notification *notif;
+        struct timespec tv;
+        u64 jiffies;
+        ulong id;
+        u32 offset;
+        int remain, ret = 0;
+        u64 end;
+
+        nvgpu_log_fn(g, " ");
+
+        if (gk20a_channel_check_timedout(ch)) {
+                return -ETIMEDOUT;
+        }
+
+        switch (args->type) {
+        case NVGPU_WAIT_TYPE_NOTIFIER:
+                id = args->condition.notifier.dmabuf_fd;
+                offset = args->condition.notifier.offset;
+                end = offset + sizeof(struct notification);
+
+                dmabuf = dma_buf_get(id);
+                if (IS_ERR(dmabuf)) {
+                        nvgpu_err(g, "invalid notifier nvmap handle 0x%lx",
+                                   id);
+                        return -EINVAL;
+                }
+
+                if (end > dmabuf->size || end < sizeof(struct notification)) {
+                        dma_buf_put(dmabuf);
+                        nvgpu_err(g, "invalid notifier offset");
+                        return -EINVAL;
+                }
+
+                nvgpu_speculation_barrier();
+
+                notif = dma_buf_vmap(dmabuf);
+                if (!notif) {
+                        nvgpu_err(g, "failed to map notifier memory");
+                        return -ENOMEM;
+                }
+
+                notif = (struct notification *)((uintptr_t)notif + offset);
+
+                /* user should set status pending before
+                 * calling this ioctl */
+                remain = NVGPU_COND_WAIT_INTERRUPTIBLE(
+                                &ch->notifier_wq,
+                                notif->status == 0 ||
+                                gk20a_channel_check_timedout(ch),
+                                args->timeout);
+
+                if (remain == 0 && notif->status != 0) {
+                        ret = -ETIMEDOUT;
+                        goto notif_clean_up;
+                } else if (remain < 0) {
+                        ret = -EINTR;
+                        goto notif_clean_up;
+                }
+
+                /* TBD: fill in correct information */
+                jiffies = get_jiffies_64();
+                jiffies_to_timespec(jiffies, &tv);
+                notif->timestamp.nanoseconds[0] = tv.tv_nsec;
+                notif->timestamp.nanoseconds[1] = tv.tv_sec;
+                notif->info32 = 0xDEADBEEF; /* should be object name */
+                notif->info16 = ch->chid; /* should be method offset */
+
+notif_clean_up:
+                dma_buf_vunmap(dmabuf, notif);
+                return ret;
+
+        case NVGPU_WAIT_TYPE_SEMAPHORE:
+                ret = gk20a_channel_wait_semaphore(ch,
+                                args->condition.semaphore.dmabuf_fd,
+                                args->condition.semaphore.offset,
+                                args->condition.semaphore.payload,
+                                args->timeout);
+
+                break;
+
+        default:
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+static int gk20a_channel_zcull_bind(struct channel_gk20a *ch,
+                            struct nvgpu_zcull_bind_args *args)
+{
+        struct gk20a *g = ch->g;
+        struct gr_gk20a *gr = &g->gr;
+
+        nvgpu_log_fn(gr->g, " ");
+
+        return g->ops.gr.bind_ctxsw_zcull(g, gr, ch,
+                                args->gpu_va, args->mode);
+}
+
+static int gk20a_ioctl_channel_submit_gpfifo(
+        struct channel_gk20a *ch,
+        struct nvgpu_submit_gpfifo_args *args)
+{
+        struct nvgpu_channel_fence fence;
+        struct gk20a_fence *fence_out;
+        struct fifo_profile_gk20a *profile = NULL;
+        u32 submit_flags = 0;
+        int fd = -1;
+        struct gk20a *g = ch->g;
+        struct nvgpu_gpfifo_userdata userdata;
+
+        int ret = 0;
+        nvgpu_log_fn(g, " ");
+
+        profile = gk20a_fifo_profile_acquire(ch->g);
+        gk20a_fifo_profile_snapshot(profile, PROFILE_IOCTL_ENTRY);
+
+        if (gk20a_channel_check_timedout(ch)) {
+                return -ETIMEDOUT;
+        }
+
+        nvgpu_get_fence_args(&args->fence, &fence);
+        submit_flags =
+                nvgpu_submit_gpfifo_user_flags_to_common_flags(args->flags);
+
+        /* Try and allocate an fd here*/
+        if ((args->flags & NVGPU_SUBMIT_GPFIFO_FLAGS_FENCE_GET)
+                && (args->flags & NVGPU_SUBMIT_GPFIFO_FLAGS_SYNC_FENCE)) {
+                        fd = get_unused_fd_flags(O_RDWR);
+                        if (fd < 0)
+                                return fd;
+        }
+
+        userdata.entries = (struct nvgpu_gpfifo_entry __user *)
+                (uintptr_t)args->gpfifo;
+        userdata.context = NULL;
+
+        ret = nvgpu_submit_channel_gpfifo_user(ch,
+                        userdata, args->num_entries,
+                        submit_flags, &fence, &fence_out, profile);
+
+        if (ret) {
+                if (fd != -1)
+                        put_unused_fd(fd);
+                goto clean_up;
+        }
+
+        /* Convert fence_out to something we can pass back to user space. */
+        if (args->flags & NVGPU_SUBMIT_GPFIFO_FLAGS_FENCE_GET) {
+                if (args->flags & NVGPU_SUBMIT_GPFIFO_FLAGS_SYNC_FENCE) {
+                        ret = gk20a_fence_install_fd(fence_out, fd);
+                        if (ret)
+                                put_unused_fd(fd);
+                        else
+                                args->fence.id = fd;
+                } else {
+                        args->fence.id = fence_out->syncpt_id;
+                        args->fence.value = fence_out->syncpt_value;
+                }
+        }
+        gk20a_fence_put(fence_out);
+
+        gk20a_fifo_profile_snapshot(profile, PROFILE_IOCTL_EXIT);
+        if (profile)
+                gk20a_fifo_profile_release(ch->g, profile);
+
+clean_up:
+        return ret;
+}
+
+/*
+ * Convert linux specific runlist level of the form NVGPU_RUNLIST_INTERLEAVE_LEVEL_*
+ * to common runlist level of the form NVGPU_FIFO_RUNLIST_INTERLEAVE_LEVEL_*
+ */
+u32 nvgpu_get_common_runlist_level(u32 level)
+{
+        nvgpu_speculation_barrier();
+        switch (level) {
+        case NVGPU_RUNLIST_INTERLEAVE_LEVEL_LOW:
+                return NVGPU_FIFO_RUNLIST_INTERLEAVE_LEVEL_LOW;
+        case NVGPU_RUNLIST_INTERLEAVE_LEVEL_MEDIUM:
+                return NVGPU_FIFO_RUNLIST_INTERLEAVE_LEVEL_MEDIUM;
+        case NVGPU_RUNLIST_INTERLEAVE_LEVEL_HIGH:
+                return NVGPU_FIFO_RUNLIST_INTERLEAVE_LEVEL_HIGH;
+        default:
+                pr_err("%s: incorrect runlist level\n", __func__);
+        }
+
+        return level;
+}
+
+static u32 nvgpu_obj_ctx_user_flags_to_common_flags(u32 user_flags)
+{
+        u32 flags = 0;
+
+        if (user_flags & NVGPU_ALLOC_OBJ_FLAGS_GFXP)
+                flags |= NVGPU_OBJ_CTX_FLAGS_SUPPORT_GFXP;
+
+        if (user_flags & NVGPU_ALLOC_OBJ_FLAGS_CILP)
+                flags |= NVGPU_OBJ_CTX_FLAGS_SUPPORT_CILP;
+
+        return flags;
+}
+
+static int nvgpu_ioctl_channel_alloc_obj_ctx(struct channel_gk20a *ch,
+        u32 class_num, u32 user_flags)
+{
+        return ch->g->ops.gr.alloc_obj_ctx(ch, class_num,
+                        nvgpu_obj_ctx_user_flags_to_common_flags(user_flags));
+}
+
+/*
+ * Convert common preemption mode flags of the form NVGPU_PREEMPTION_MODE_GRAPHICS_*
+ * into linux preemption mode flags of the form NVGPU_GRAPHICS_PREEMPTION_MODE_*
+ */
+u32 nvgpu_get_ioctl_graphics_preempt_mode_flags(u32 graphics_preempt_mode_flags)
+{
+        u32 flags = 0;
+
+        if (graphics_preempt_mode_flags & NVGPU_PREEMPTION_MODE_GRAPHICS_WFI)
+                flags |= NVGPU_GRAPHICS_PREEMPTION_MODE_WFI;
+        if (graphics_preempt_mode_flags & NVGPU_PREEMPTION_MODE_GRAPHICS_GFXP)
+                flags |= NVGPU_GRAPHICS_PREEMPTION_MODE_GFXP;
+
+        return flags;
+}
+
+/*
+ * Convert common preemption mode flags of the form NVGPU_PREEMPTION_MODE_COMPUTE_*
+ * into linux preemption mode flags of the form NVGPU_COMPUTE_PREEMPTION_MODE_*
+ */
+u32 nvgpu_get_ioctl_compute_preempt_mode_flags(u32 compute_preempt_mode_flags)
+{
+        u32 flags = 0;
+
+        if (compute_preempt_mode_flags & NVGPU_PREEMPTION_MODE_COMPUTE_WFI)
+                flags |= NVGPU_COMPUTE_PREEMPTION_MODE_WFI;
+        if (compute_preempt_mode_flags & NVGPU_PREEMPTION_MODE_COMPUTE_CTA)
+                flags |= NVGPU_COMPUTE_PREEMPTION_MODE_CTA;
+        if (compute_preempt_mode_flags & NVGPU_PREEMPTION_MODE_COMPUTE_CILP)
+                flags |= NVGPU_COMPUTE_PREEMPTION_MODE_CILP;
+
+        return flags;
+}
+
+/*
+ * Convert common preemption modes of the form NVGPU_PREEMPTION_MODE_GRAPHICS_*
+ * into linux preemption modes of the form NVGPU_GRAPHICS_PREEMPTION_MODE_*
+ */
+u32 nvgpu_get_ioctl_graphics_preempt_mode(u32 graphics_preempt_mode)
+{
+        switch (graphics_preempt_mode) {
+        case NVGPU_PREEMPTION_MODE_GRAPHICS_WFI:
+                return NVGPU_GRAPHICS_PREEMPTION_MODE_WFI;
+        case NVGPU_PREEMPTION_MODE_GRAPHICS_GFXP:
+                return NVGPU_GRAPHICS_PREEMPTION_MODE_GFXP;
+        }
+
+        return graphics_preempt_mode;
+}
+
+/*
+ * Convert common preemption modes of the form NVGPU_PREEMPTION_MODE_COMPUTE_*
+ * into linux preemption modes of the form NVGPU_COMPUTE_PREEMPTION_MODE_*
+ */
+u32 nvgpu_get_ioctl_compute_preempt_mode(u32 compute_preempt_mode)
+{
+        switch (compute_preempt_mode) {
+        case NVGPU_PREEMPTION_MODE_COMPUTE_WFI:
+                return NVGPU_COMPUTE_PREEMPTION_MODE_WFI;
+        case NVGPU_PREEMPTION_MODE_COMPUTE_CTA:
+                return NVGPU_COMPUTE_PREEMPTION_MODE_CTA;
+        case NVGPU_PREEMPTION_MODE_COMPUTE_CILP:
+                return NVGPU_COMPUTE_PREEMPTION_MODE_CILP;
+        }
+
+        return compute_preempt_mode;
+}
+
+/*
+ * Convert linux preemption modes of the form NVGPU_GRAPHICS_PREEMPTION_MODE_*
+ * into common preemption modes of the form NVGPU_PREEMPTION_MODE_GRAPHICS_*
+ */
+static u32 nvgpu_get_common_graphics_preempt_mode(u32 graphics_preempt_mode)
+{
+        nvgpu_speculation_barrier();
+        switch (graphics_preempt_mode) {
+        case NVGPU_GRAPHICS_PREEMPTION_MODE_WFI:
+                return NVGPU_PREEMPTION_MODE_GRAPHICS_WFI;
+        case NVGPU_GRAPHICS_PREEMPTION_MODE_GFXP:
+                return NVGPU_PREEMPTION_MODE_GRAPHICS_GFXP;
+        }
+
+        return graphics_preempt_mode;
+}
+
+/*
+ * Convert linux preemption modes of the form NVGPU_COMPUTE_PREEMPTION_MODE_*
+ * into common preemption modes of the form NVGPU_PREEMPTION_MODE_COMPUTE_*
+ */
+static u32 nvgpu_get_common_compute_preempt_mode(u32 compute_preempt_mode)
+{
+        nvgpu_speculation_barrier();
+        switch (compute_preempt_mode) {
+        case NVGPU_COMPUTE_PREEMPTION_MODE_WFI:
+                return NVGPU_PREEMPTION_MODE_COMPUTE_WFI;
+        case NVGPU_COMPUTE_PREEMPTION_MODE_CTA:
+                return NVGPU_PREEMPTION_MODE_COMPUTE_CTA;
+        case NVGPU_COMPUTE_PREEMPTION_MODE_CILP:
+                return NVGPU_PREEMPTION_MODE_COMPUTE_CILP;
+        }
+
+        return compute_preempt_mode;
+}
+
+static int nvgpu_ioctl_channel_set_preemption_mode(struct channel_gk20a *ch,
+        u32 graphics_preempt_mode, u32 compute_preempt_mode)
+{
+        int err;
+
+        if (ch->g->ops.gr.set_preemption_mode) {
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        nvgpu_err(ch->g, "failed to power on, %d", err);
+                        return err;
+                }
+                err = ch->g->ops.gr.set_preemption_mode(ch,
+                        nvgpu_get_common_graphics_preempt_mode(graphics_preempt_mode),
+                        nvgpu_get_common_compute_preempt_mode(compute_preempt_mode));
+                gk20a_idle(ch->g);
+        } else {
+                err = -EINVAL;
+        }
+
+        return err;
+}
+
+static int nvgpu_ioctl_channel_get_user_syncpoint(struct channel_gk20a *ch,
+        struct nvgpu_get_user_syncpoint_args *args)
+{
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        struct gk20a *g = ch->g;
+        int err;
+
+        if (!nvgpu_is_enabled(g, NVGPU_SUPPORT_USER_SYNCPOINT)) {
+                nvgpu_err(g, "user syncpoints not supported");
+                return -EINVAL;
+        }
+
+        if (!nvgpu_has_syncpoints(g)) {
+                nvgpu_err(g, "syncpoints not supported");
+                return -EINVAL;
+        }
+
+        if (g->aggressive_sync_destroy_thresh) {
+                nvgpu_err(g, "sufficient syncpoints not available");
+                return -EINVAL;
+        }
+
+        nvgpu_mutex_acquire(&ch->sync_lock);
+        if (ch->user_sync) {
+                nvgpu_mutex_release(&ch->sync_lock);
+        } else {
+                ch->user_sync = nvgpu_channel_sync_create(ch, true);
+                if (!ch->user_sync) {
+                        nvgpu_mutex_release(&ch->sync_lock);
+                        return -ENOMEM;
+                }
+                nvgpu_mutex_release(&ch->sync_lock);
+
+                if (g->ops.fifo.resetup_ramfc) {
+                        err = g->ops.fifo.resetup_ramfc(ch);
+                        if (err)
+                                return err;
+                }
+        }
+
+        args->syncpoint_id = ch->user_sync->syncpt_id(ch->user_sync);
+        args->syncpoint_max = nvgpu_nvhost_syncpt_read_maxval(g->nvhost_dev,
+                                                args->syncpoint_id);
+        if (nvgpu_is_enabled(g, NVGPU_SUPPORT_SYNCPOINT_ADDRESS))
+                args->gpu_va = ch->user_sync->syncpt_address(ch->user_sync);
+        else
+                args->gpu_va = 0;
+
+        return 0;
+#else
+        return -EINVAL;
+#endif
+}
+
+long gk20a_channel_ioctl(struct file *filp,
+        unsigned int cmd, unsigned long arg)
+{
+        struct channel_priv *priv = filp->private_data;
+        struct channel_gk20a *ch = priv->c;
+        struct device *dev = dev_from_gk20a(ch->g);
+        u8 buf[NVGPU_IOCTL_CHANNEL_MAX_ARG_SIZE] = {0};
+        int err = 0;
+        struct gk20a *g = ch->g;
+
+        nvgpu_log_fn(g, "start %d", _IOC_NR(cmd));
+
+        if ((_IOC_TYPE(cmd) != NVGPU_IOCTL_MAGIC) ||
+                (_IOC_NR(cmd) == 0) ||
+                (_IOC_NR(cmd) > NVGPU_IOCTL_CHANNEL_LAST) ||
+                (_IOC_SIZE(cmd) > NVGPU_IOCTL_CHANNEL_MAX_ARG_SIZE))
+                return -EINVAL;
+
+        if (_IOC_DIR(cmd) & _IOC_WRITE) {
+                if (copy_from_user(buf, (void __user *)arg, _IOC_SIZE(cmd)))
+                        return -EFAULT;
+        }
+
+        /* take a ref or return timeout if channel refs can't be taken */
+        ch = gk20a_channel_get(ch);
+        if (!ch)
+                return -ETIMEDOUT;
+
+        /* protect our sanity for threaded userspace - most of the channel is
+         * not thread safe */
+        nvgpu_mutex_acquire(&ch->ioctl_lock);
+
+        /* this ioctl call keeps a ref to the file which keeps a ref to the
+         * channel */
+
+        nvgpu_speculation_barrier();
+        switch (cmd) {
+        case NVGPU_IOCTL_CHANNEL_OPEN:
+                err = gk20a_channel_open_ioctl(ch->g,
+                        (struct nvgpu_channel_open_args *)buf);
+                break;
+        case NVGPU_IOCTL_CHANNEL_SET_NVMAP_FD:
+                break;
+        case NVGPU_IOCTL_CHANNEL_ALLOC_OBJ_CTX:
+        {
+                struct nvgpu_alloc_obj_ctx_args *args =
+                                (struct nvgpu_alloc_obj_ctx_args *)buf;
+
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        dev_err(dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        break;
+                }
+                err = nvgpu_ioctl_channel_alloc_obj_ctx(ch, args->class_num, args->flags);
+                gk20a_idle(ch->g);
+                break;
+        }
+        case NVGPU_IOCTL_CHANNEL_SETUP_BIND:
+        {
+                struct nvgpu_channel_setup_bind_args *channel_setup_bind_args =
+                        (struct nvgpu_channel_setup_bind_args *)buf;
+                struct nvgpu_setup_bind_args setup_bind_args;
+
+                nvgpu_get_setup_bind_args(channel_setup_bind_args,
+                                &setup_bind_args);
+
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        dev_err(dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        break;
+                }
+
+                if (!is_power_of_2(setup_bind_args.num_gpfifo_entries)) {
+                        err = -EINVAL;
+                        gk20a_idle(ch->g);
+                        break;
+                }
+                err = nvgpu_channel_setup_bind(ch, &setup_bind_args);
+                channel_setup_bind_args->work_submit_token =
+                        setup_bind_args.work_submit_token;
+                gk20a_idle(ch->g);
+                break;
+        }
+        case NVGPU_IOCTL_CHANNEL_ALLOC_GPFIFO_EX:
+        {
+                struct nvgpu_alloc_gpfifo_ex_args *alloc_gpfifo_ex_args =
+                        (struct nvgpu_alloc_gpfifo_ex_args *)buf;
+                struct nvgpu_setup_bind_args setup_bind_args;
+
+                nvgpu_get_gpfifo_ex_args(alloc_gpfifo_ex_args, &setup_bind_args);
+
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        dev_err(dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        break;
+                }
+
+                if (!is_power_of_2(alloc_gpfifo_ex_args->num_entries)) {
+                        err = -EINVAL;
+                        gk20a_idle(ch->g);
+                        break;
+                }
+                err = nvgpu_channel_setup_bind(ch, &setup_bind_args);
+                gk20a_idle(ch->g);
+                break;
+        }
+        case NVGPU_IOCTL_CHANNEL_ALLOC_GPFIFO:
+        {
+                struct nvgpu_alloc_gpfifo_args *alloc_gpfifo_args =
+                        (struct nvgpu_alloc_gpfifo_args *)buf;
+                struct nvgpu_setup_bind_args setup_bind_args;
+
+                nvgpu_get_gpfifo_args(alloc_gpfifo_args, &setup_bind_args);
+
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        dev_err(dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        break;
+                }
+
+                err = nvgpu_channel_setup_bind(ch, &setup_bind_args);
+                gk20a_idle(ch->g);
+                break;
+        }
+        case NVGPU_IOCTL_CHANNEL_SUBMIT_GPFIFO:
+                err = gk20a_ioctl_channel_submit_gpfifo(ch,
+                                (struct nvgpu_submit_gpfifo_args *)buf);
+                break;
+        case NVGPU_IOCTL_CHANNEL_WAIT:
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        dev_err(dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        break;
+                }
+
+                /* waiting is thread-safe, not dropping this mutex could
+                 * deadlock in certain conditions */
+                nvgpu_mutex_release(&ch->ioctl_lock);
+
+                err = gk20a_channel_wait(ch,
+                                (struct nvgpu_wait_args *)buf);
+
+                nvgpu_mutex_acquire(&ch->ioctl_lock);
+
+                gk20a_idle(ch->g);
+                break;
+        case NVGPU_IOCTL_CHANNEL_ZCULL_BIND:
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        dev_err(dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        break;
+                }
+                err = gk20a_channel_zcull_bind(ch,
+                                (struct nvgpu_zcull_bind_args *)buf);
+                gk20a_idle(ch->g);
+                break;
+        case NVGPU_IOCTL_CHANNEL_SET_ERROR_NOTIFIER:
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        dev_err(dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        break;
+                }
+                err = gk20a_init_error_notifier(ch,
+                                (struct nvgpu_set_error_notifier *)buf);
+                gk20a_idle(ch->g);
+                break;
+        case NVGPU_IOCTL_CHANNEL_SET_TIMEOUT:
+        {
+                u32 timeout =
+                        (u32)((struct nvgpu_set_timeout_args *)buf)->timeout;
+                nvgpu_log(g, gpu_dbg_gpu_dbg, "setting timeout (%d ms) for chid %d",
+                           timeout, ch->chid);
+                ch->timeout_ms_max = timeout;
+                gk20a_channel_trace_sched_param(
+                        trace_gk20a_channel_set_timeout, ch);
+                break;
+        }
+        case NVGPU_IOCTL_CHANNEL_SET_TIMEOUT_EX:
+        {
+                u32 timeout =
+                        (u32)((struct nvgpu_set_timeout_args *)buf)->timeout;
+                bool timeout_debug_dump = !((u32)
+                        ((struct nvgpu_set_timeout_ex_args *)buf)->flags &
+                        (1 << NVGPU_TIMEOUT_FLAG_DISABLE_DUMP));
+                nvgpu_log(g, gpu_dbg_gpu_dbg, "setting timeout (%d ms) for chid %d",
+                           timeout, ch->chid);
+                ch->timeout_ms_max = timeout;
+                ch->timeout_debug_dump = timeout_debug_dump;
+                gk20a_channel_trace_sched_param(
+                        trace_gk20a_channel_set_timeout, ch);
+                break;
+        }
+        case NVGPU_IOCTL_CHANNEL_GET_TIMEDOUT:
+                ((struct nvgpu_get_param_args *)buf)->value =
+                        gk20a_channel_check_timedout(ch);
+                break;
+        case NVGPU_IOCTL_CHANNEL_ENABLE:
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        dev_err(dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        break;
+                }
+                if (ch->g->ops.fifo.enable_channel)
+                        ch->g->ops.fifo.enable_channel(ch);
+                else
+                        err = -ENOSYS;
+                gk20a_idle(ch->g);
+                break;
+        case NVGPU_IOCTL_CHANNEL_DISABLE:
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        dev_err(dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        break;
+                }
+                if (ch->g->ops.fifo.disable_channel)
+                        ch->g->ops.fifo.disable_channel(ch);
+                else
+                        err = -ENOSYS;
+                gk20a_idle(ch->g);
+                break;
+        case NVGPU_IOCTL_CHANNEL_PREEMPT:
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        dev_err(dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        break;
+                }
+                err = gk20a_fifo_preempt(ch->g, ch);
+                gk20a_idle(ch->g);
+                break;
+        case NVGPU_IOCTL_CHANNEL_RESCHEDULE_RUNLIST:
+                if (!capable(CAP_SYS_NICE)) {
+                        err = -EPERM;
+                        break;
+                }
+                if (!ch->g->ops.fifo.reschedule_runlist) {
+                        err = -ENOSYS;
+                        break;
+                }
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        dev_err(dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        break;
+                }
+                err = ch->g->ops.fifo.reschedule_runlist(ch,
+                        NVGPU_RESCHEDULE_RUNLIST_PREEMPT_NEXT &
+                        ((struct nvgpu_reschedule_runlist_args *)buf)->flags);
+                gk20a_idle(ch->g);
+                break;
+        case NVGPU_IOCTL_CHANNEL_FORCE_RESET:
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        dev_err(dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        break;
+                }
+                err = ch->g->ops.fifo.force_reset_ch(ch,
+                                NVGPU_ERR_NOTIFIER_RESETCHANNEL_VERIF_ERROR, true);
+                gk20a_idle(ch->g);
+                break;
+        case NVGPU_IOCTL_CHANNEL_WDT:
+                err = gk20a_channel_set_wdt_status(ch,
+                                (struct nvgpu_channel_wdt_args *)buf);
+                break;
+        case NVGPU_IOCTL_CHANNEL_SET_PREEMPTION_MODE:
+                err = nvgpu_ioctl_channel_set_preemption_mode(ch,
+                     ((struct nvgpu_preemption_mode_args *)buf)->graphics_preempt_mode,
+                     ((struct nvgpu_preemption_mode_args *)buf)->compute_preempt_mode);
+                break;
+        case NVGPU_IOCTL_CHANNEL_SET_BOOSTED_CTX:
+                if (ch->g->ops.gr.set_boosted_ctx) {
+                        bool boost =
+                                ((struct nvgpu_boosted_ctx_args *)buf)->boost;
+
+                        err = gk20a_busy(ch->g);
+                        if (err) {
+                                dev_err(dev,
+                                        "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                        __func__, cmd);
+                                break;
+                        }
+                        err = ch->g->ops.gr.set_boosted_ctx(ch, boost);
+                        gk20a_idle(ch->g);
+                } else {
+                        err = -EINVAL;
+                }
+                break;
+        case NVGPU_IOCTL_CHANNEL_GET_USER_SYNCPOINT:
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        dev_err(dev,
+                                "%s: failed to host gk20a for ioctl cmd: 0x%x",
+                                __func__, cmd);
+                        break;
+                }
+                err = nvgpu_ioctl_channel_get_user_syncpoint(ch,
+                      (struct nvgpu_get_user_syncpoint_args *)buf);
+                gk20a_idle(ch->g);
+                break;
+        default:
+                dev_dbg(dev, "unrecognized ioctl cmd: 0x%x", cmd);
+                err = -ENOTTY;
+                break;
+        }
+
+        if ((err == 0) && (_IOC_DIR(cmd) & _IOC_READ))
+                err = copy_to_user((void __user *)arg, buf, _IOC_SIZE(cmd));
+
+        nvgpu_mutex_release(&ch->ioctl_lock);
+
+        gk20a_channel_put(ch);
+
+        nvgpu_log_fn(g, "end");
+
+        return err;
+}
diff --git a/include/os/linux/ioctl_channel.h b/include/os/linux/ioctl_channel.h
new file mode 100644
index 0000000..3e80289
--- /dev/null
+++ b/include/os/linux/ioctl_channel.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2017-2020, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+#ifndef __NVGPU_IOCTL_CHANNEL_H__
+#define __NVGPU_IOCTL_CHANNEL_H__
+
+#include <linux/fs.h>
+
+#include "gk20a/css_gr_gk20a.h"
+
+struct inode;
+struct file;
+struct gk20a;
+struct nvgpu_channel_open_args;
+
+struct gk20a_cs_snapshot_client_linux {
+        struct gk20a_cs_snapshot_client cs_client;
+
+        u32                     dmabuf_fd;
+        struct dma_buf          *dma_handler;
+};
+
+int gk20a_channel_open(struct inode *inode, struct file *filp);
+int gk20a_channel_release(struct inode *inode, struct file *filp);
+long gk20a_channel_ioctl(struct file *filp,
+        unsigned int cmd, unsigned long arg);
+int gk20a_channel_open_ioctl(struct gk20a *g,
+                struct nvgpu_channel_open_args *args);
+
+int gk20a_channel_cycle_stats(struct channel_gk20a *ch, int dmabuf_fd);
+void gk20a_channel_free_cycle_stats_buffer(struct channel_gk20a *ch);
+
+int gk20a_attach_cycle_stats_snapshot(struct channel_gk20a *ch,
+                                u32 dmabuf_fd,
+                                u32 perfmon_id_count,
+                                u32 *perfmon_id_start);
+int gk20a_flush_cycle_stats_snapshot(struct channel_gk20a *ch);
+int gk20a_channel_free_cycle_stats_snapshot(struct channel_gk20a *ch);
+
+extern const struct file_operations gk20a_channel_ops;
+
+u32 nvgpu_get_common_runlist_level(u32 level);
+
+u32 nvgpu_get_ioctl_graphics_preempt_mode_flags(u32 graphics_preempt_mode_flags);
+u32 nvgpu_get_ioctl_compute_preempt_mode_flags(u32 compute_preempt_mode_flags);
+u32 nvgpu_get_ioctl_graphics_preempt_mode(u32 graphics_preempt_mode);
+u32 nvgpu_get_ioctl_compute_preempt_mode(u32 compute_preempt_mode);
+#endif
diff --git a/include/os/linux/ioctl_clk_arb.c b/include/os/linux/ioctl_clk_arb.c
new file mode 100644
index 0000000..477222d
--- /dev/null
+++ b/include/os/linux/ioctl_clk_arb.c
@@ -0,0 +1,574 @@
+/*
+ * Copyright (c) 2016-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/cdev.h>
+#include <linux/file.h>
+#include <linux/anon_inodes.h>
+#include <linux/uaccess.h>
+#include <linux/poll.h>
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+#endif
+#include <uapi/linux/nvgpu.h>
+
+#include <nvgpu/bitops.h>
+#include <nvgpu/lock.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/atomic.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/kref.h>
+#include <nvgpu/log.h>
+#include <nvgpu/barrier.h>
+#include <nvgpu/cond.h>
+#include <nvgpu/list.h>
+#include <nvgpu/clk_arb.h>
+#include <nvgpu/gk20a.h>
+
+#include "clk/clk.h"
+#include "pstate/pstate.h"
+#include "lpwr/lpwr.h"
+#include "volt/volt.h"
+
+#ifdef CONFIG_DEBUG_FS
+#include "os_linux.h"
+#endif
+
+static int nvgpu_clk_arb_release_completion_dev(struct inode *inode,
+                struct file *filp)
+{
+        struct nvgpu_clk_dev *dev = filp->private_data;
+        struct nvgpu_clk_session *session = dev->session;
+
+
+        clk_arb_dbg(session->g, " ");
+
+        /* This is done to account for the extra refcount taken in
+         * nvgpu_clk_arb_commit_request_fd without events support in iGPU
+         */
+        if (!session->g->clk_arb->clk_arb_events_supported) {
+                nvgpu_ref_put(&dev->refcount, nvgpu_clk_arb_free_fd);
+        }
+
+        nvgpu_ref_put(&session->refcount, nvgpu_clk_arb_free_session);
+        nvgpu_ref_put(&dev->refcount, nvgpu_clk_arb_free_fd);
+        return 0;
+}
+
+static inline unsigned int nvgpu_convert_poll_mask(unsigned int nvgpu_poll_mask)
+{
+        unsigned int poll_mask = 0;
+
+        if (nvgpu_poll_mask & NVGPU_POLLIN)
+                poll_mask |= POLLIN;
+        if (nvgpu_poll_mask & NVGPU_POLLPRI)
+                poll_mask |= POLLPRI;
+        if (nvgpu_poll_mask & NVGPU_POLLOUT)
+                poll_mask |= POLLOUT;
+        if (nvgpu_poll_mask & NVGPU_POLLRDNORM)
+                poll_mask |= POLLRDNORM;
+        if (nvgpu_poll_mask & NVGPU_POLLHUP)
+                poll_mask |= POLLHUP;
+
+        return poll_mask;
+}
+
+static unsigned int nvgpu_clk_arb_poll_dev(struct file *filp, poll_table *wait)
+{
+        struct nvgpu_clk_dev *dev = filp->private_data;
+
+        clk_arb_dbg(dev->session->g, " ");
+
+        poll_wait(filp, &dev->readout_wq.wq, wait);
+        return nvgpu_convert_poll_mask(nvgpu_atomic_xchg(&dev->poll_mask, 0));
+}
+
+void nvgpu_clk_arb_event_post_event(struct nvgpu_clk_dev *dev)
+{
+        nvgpu_cond_broadcast_interruptible(&dev->readout_wq);
+}
+
+static int nvgpu_clk_arb_release_event_dev(struct inode *inode,
+                struct file *filp)
+{
+        struct nvgpu_clk_dev *dev = filp->private_data;
+        struct nvgpu_clk_session *session = dev->session;
+        struct nvgpu_clk_arb *arb;
+
+        arb = session->g->clk_arb;
+
+        clk_arb_dbg(session->g, " ");
+
+        if (arb) {
+                nvgpu_spinlock_acquire(&arb->users_lock);
+                nvgpu_list_del(&dev->link);
+                nvgpu_spinlock_release(&arb->users_lock);
+                nvgpu_clk_notification_queue_free(arb->g, &dev->queue);
+        }
+
+        nvgpu_ref_put(&session->refcount, nvgpu_clk_arb_free_session);
+        nvgpu_ref_put(&dev->refcount, nvgpu_clk_arb_free_fd);
+
+        return 0;
+}
+
+static inline u32 nvgpu_convert_gpu_event(u32 nvgpu_event)
+{
+        u32 nvgpu_gpu_event;
+
+        switch (nvgpu_event) {
+        case NVGPU_EVENT_VF_UPDATE:
+                nvgpu_gpu_event = NVGPU_GPU_EVENT_VF_UPDATE;
+                break;
+        case NVGPU_EVENT_ALARM_TARGET_VF_NOT_POSSIBLE:
+                nvgpu_gpu_event = NVGPU_GPU_EVENT_ALARM_TARGET_VF_NOT_POSSIBLE;
+                break;
+        case NVGPU_EVENT_ALARM_LOCAL_TARGET_VF_NOT_POSSIBLE:
+                nvgpu_gpu_event = NVGPU_GPU_EVENT_ALARM_LOCAL_TARGET_VF_NOT_POSSIBLE;
+                break;
+        case NVGPU_EVENT_ALARM_CLOCK_ARBITER_FAILED:
+                nvgpu_gpu_event = NVGPU_GPU_EVENT_ALARM_CLOCK_ARBITER_FAILED;
+                break;
+        case NVGPU_EVENT_ALARM_VF_TABLE_UPDATE_FAILED:
+                nvgpu_gpu_event = NVGPU_GPU_EVENT_ALARM_VF_TABLE_UPDATE_FAILED;
+                break;
+        case NVGPU_EVENT_ALARM_THERMAL_ABOVE_THRESHOLD:
+                nvgpu_gpu_event = NVGPU_GPU_EVENT_ALARM_THERMAL_ABOVE_THRESHOLD;
+                break;
+        case NVGPU_EVENT_ALARM_POWER_ABOVE_THRESHOLD:
+                nvgpu_gpu_event = NVGPU_GPU_EVENT_ALARM_POWER_ABOVE_THRESHOLD;
+                break;
+        case NVGPU_EVENT_ALARM_GPU_LOST:
+                nvgpu_gpu_event = NVGPU_GPU_EVENT_ALARM_GPU_LOST;
+                break;
+                default:
+                /* Control shouldn't come here */
+                nvgpu_gpu_event = NVGPU_GPU_EVENT_ALARM_GPU_LOST + 1;
+                break;
+        }
+        return nvgpu_gpu_event;
+}
+
+static inline u32 __pending_event(struct nvgpu_clk_dev *dev,
+                struct nvgpu_gpu_event_info *info) {
+
+        u32 tail, head;
+        u32 events = 0;
+        struct nvgpu_clk_notification *p_notif;
+
+        tail = nvgpu_atomic_read(&dev->queue.tail);
+        head = nvgpu_atomic_read(&dev->queue.head);
+
+        head = (tail - head) < dev->queue.size ? head : tail - dev->queue.size;
+
+        if (_WRAPGTEQ(tail, head) && info) {
+                head++;
+                p_notif = &dev->queue.notifications[head % dev->queue.size];
+                events |= nvgpu_convert_gpu_event(p_notif->notification);
+                info->event_id = ffs(events) - 1;
+                info->timestamp = p_notif->timestamp;
+                nvgpu_atomic_set(&dev->queue.head, head);
+        }
+
+        return events;
+}
+
+static ssize_t nvgpu_clk_arb_read_event_dev(struct file *filp, char __user *buf,
+                                        size_t size, loff_t *off)
+{
+        struct nvgpu_clk_dev *dev = filp->private_data;
+        struct nvgpu_gpu_event_info info;
+        ssize_t err;
+
+        clk_arb_dbg(dev->session->g,
+                        "filp=%p, buf=%p, size=%zu", filp, buf, size);
+
+        if ((size - *off) < sizeof(info))
+                return 0;
+
+        memset(&info, 0, sizeof(info));
+        /* Get the oldest event from the queue */
+        while (!__pending_event(dev, &info)) {
+                if (filp->f_flags & O_NONBLOCK)
+                        return -EAGAIN;
+                err = NVGPU_COND_WAIT_INTERRUPTIBLE(&dev->readout_wq,
+                                __pending_event(dev, &info), 0);
+                if (err)
+                        return err;
+                if (info.timestamp)
+                        break;
+        }
+
+        if (copy_to_user(buf + *off, &info, sizeof(info)))
+                return -EFAULT;
+
+        return sizeof(info);
+}
+
+static int nvgpu_clk_arb_set_event_filter(struct nvgpu_clk_dev *dev,
+                struct nvgpu_gpu_set_event_filter_args *args)
+{
+        struct gk20a *g = dev->session->g;
+        u32 mask;
+
+        nvgpu_log(g, gpu_dbg_fn, " ");
+
+        if (args->flags)
+                return -EINVAL;
+
+        if (args->size != 1)
+                return -EINVAL;
+
+        if (copy_from_user(&mask, (void __user *) args->buffer,
+                        args->size * sizeof(u32)))
+                return -EFAULT;
+
+        /* update alarm mask */
+        nvgpu_atomic_set(&dev->enabled_mask, mask);
+
+        return 0;
+}
+
+static long nvgpu_clk_arb_ioctl_event_dev(struct file *filp, unsigned int cmd,
+                unsigned long arg)
+{
+        struct nvgpu_clk_dev *dev = filp->private_data;
+        struct gk20a *g = dev->session->g;
+        u8 buf[NVGPU_EVENT_IOCTL_MAX_ARG_SIZE];
+        int err = 0;
+
+        nvgpu_log(g, gpu_dbg_fn, "nr=%d", _IOC_NR(cmd));
+
+        if ((_IOC_TYPE(cmd) != NVGPU_EVENT_IOCTL_MAGIC) || (_IOC_NR(cmd) == 0)
+                || (_IOC_NR(cmd) > NVGPU_EVENT_IOCTL_LAST))
+                return -EINVAL;
+
+        BUG_ON(_IOC_SIZE(cmd) > NVGPU_EVENT_IOCTL_MAX_ARG_SIZE);
+
+        memset(buf, 0, sizeof(buf));
+        if (_IOC_DIR(cmd) & _IOC_WRITE) {
+                if (copy_from_user(buf, (void __user *) arg, _IOC_SIZE(cmd)))
+                        return -EFAULT;
+        }
+
+        switch (cmd) {
+        case NVGPU_EVENT_IOCTL_SET_FILTER:
+                err = nvgpu_clk_arb_set_event_filter(dev,
+                                (struct nvgpu_gpu_set_event_filter_args *)buf);
+                break;
+        default:
+                nvgpu_warn(g, "unrecognized event ioctl cmd: 0x%x", cmd);
+                err = -ENOTTY;
+        }
+
+        if ((err == 0) && (_IOC_DIR(cmd) & _IOC_READ))
+                err = copy_to_user((void __user *) arg, buf, _IOC_SIZE(cmd));
+
+        return err;
+}
+
+static const struct file_operations completion_dev_ops = {
+        .owner = THIS_MODULE,
+        .release = nvgpu_clk_arb_release_completion_dev,
+        .poll = nvgpu_clk_arb_poll_dev,
+};
+
+static const struct file_operations event_dev_ops = {
+        .owner = THIS_MODULE,
+        .release = nvgpu_clk_arb_release_event_dev,
+        .poll = nvgpu_clk_arb_poll_dev,
+        .read = nvgpu_clk_arb_read_event_dev,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl = nvgpu_clk_arb_ioctl_event_dev,
+#endif
+        .unlocked_ioctl = nvgpu_clk_arb_ioctl_event_dev,
+};
+
+static int nvgpu_clk_arb_install_fd(struct gk20a *g,
+                struct nvgpu_clk_session *session,
+                const struct file_operations *fops,
+                struct nvgpu_clk_dev **_dev)
+{
+        struct file *file;
+        int fd;
+        int err;
+        int status;
+        char name[64];
+        struct nvgpu_clk_dev *dev;
+
+        clk_arb_dbg(g, " ");
+
+        dev = nvgpu_kzalloc(g, sizeof(*dev));
+        if (!dev)
+                return -ENOMEM;
+
+        status = nvgpu_clk_notification_queue_alloc(g, &dev->queue,
+                DEFAULT_EVENT_NUMBER);
+        if (status < 0)  {
+                err = status;
+                goto fail;
+        }
+
+        fd = get_unused_fd_flags(O_RDWR);
+        if (fd < 0) {
+                err = fd;
+                goto fail;
+        }
+
+        snprintf(name, sizeof(name), "%s-clk-fd%d", g->name, fd);
+        file = anon_inode_getfile(name, fops, dev, O_RDWR);
+        if (IS_ERR(file)) {
+                err = PTR_ERR(file);
+                goto fail_fd;
+        }
+
+        fd_install(fd, file);
+
+        nvgpu_cond_init(&dev->readout_wq);
+
+        nvgpu_atomic_set(&dev->poll_mask, 0);
+
+        dev->session = session;
+        nvgpu_ref_init(&dev->refcount);
+
+        nvgpu_ref_get(&session->refcount);
+
+        *_dev = dev;
+
+        return fd;
+
+fail_fd:
+        put_unused_fd(fd);
+fail:
+        nvgpu_kfree(g, dev);
+
+        return err;
+}
+
+int nvgpu_clk_arb_install_event_fd(struct gk20a *g,
+        struct nvgpu_clk_session *session, int *event_fd, u32 alarm_mask)
+{
+        struct nvgpu_clk_arb *arb = g->clk_arb;
+        struct nvgpu_clk_dev *dev;
+        int fd;
+
+        clk_arb_dbg(g, " ");
+
+        fd = nvgpu_clk_arb_install_fd(g, session, &event_dev_ops, &dev);
+        if (fd < 0)
+                return fd;
+
+        /* TODO: alarm mask needs to be set to default value to prevent
+         * failures of legacy tests. This will be removed when sanity is
+         * updated
+         */
+        if (alarm_mask)
+                nvgpu_atomic_set(&dev->enabled_mask, alarm_mask);
+        else
+                nvgpu_atomic_set(&dev->enabled_mask, EVENT(VF_UPDATE));
+
+        dev->arb_queue_head = nvgpu_atomic_read(&arb->notification_queue.head);
+
+        nvgpu_spinlock_acquire(&arb->users_lock);
+        nvgpu_list_add_tail(&dev->link, &arb->users);
+        nvgpu_spinlock_release(&arb->users_lock);
+
+        *event_fd = fd;
+
+        return 0;
+}
+
+int nvgpu_clk_arb_install_request_fd(struct gk20a *g,
+        struct nvgpu_clk_session *session, int *request_fd)
+{
+        struct nvgpu_clk_dev *dev;
+        int fd;
+
+        clk_arb_dbg(g, " ");
+
+        fd = nvgpu_clk_arb_install_fd(g, session, &completion_dev_ops, &dev);
+        if (fd < 0)
+                return fd;
+
+        *request_fd = fd;
+
+        return 0;
+}
+
+int nvgpu_clk_arb_commit_request_fd(struct gk20a *g,
+        struct nvgpu_clk_session *session, int request_fd)
+{
+        struct nvgpu_clk_arb *arb = g->clk_arb;
+        struct nvgpu_clk_dev *dev;
+        struct fd fd;
+        int err = 0;
+
+        clk_arb_dbg(g, " ");
+
+        fd  = fdget(request_fd);
+        if (!fd.file)
+                return -EINVAL;
+
+        if (fd.file->f_op != &completion_dev_ops) {
+                err = -EINVAL;
+                goto fdput_fd;
+        }
+
+        dev = (struct nvgpu_clk_dev *) fd.file->private_data;
+
+        if (!dev || dev->session != session) {
+                err = -EINVAL;
+                goto fdput_fd;
+        }
+
+        clk_arb_dbg(g, "requested target = %u\n",
+                (u32)dev->gpc2clk_target_mhz);
+
+        nvgpu_atomic_inc(&g->clk_arb_global_nr);
+        nvgpu_ref_get(&dev->refcount);
+        nvgpu_spinlock_acquire(&session->session_lock);
+        nvgpu_list_add(&dev->node, &session->targets);
+        nvgpu_spinlock_release(&session->session_lock);
+        nvgpu_clk_arb_worker_enqueue(g, &arb->update_arb_work_item);
+
+fdput_fd:
+        fdput(fd);
+        return err;
+}
+
+int nvgpu_clk_arb_set_session_target_mhz(struct nvgpu_clk_session *session,
+                int request_fd, u32 api_domain, u16 target_mhz)
+{
+        struct nvgpu_clk_dev *dev;
+        struct fd fd;
+        int err = 0;
+
+        clk_arb_dbg(session->g,
+                        "domain=0x%08x target_mhz=%u", api_domain, target_mhz);
+
+        fd = fdget(request_fd);
+        if (!fd.file)
+                return -EINVAL;
+
+        if (fd.file->f_op != &completion_dev_ops) {
+                err = -EINVAL;
+                goto fdput_fd;
+        }
+
+        dev = fd.file->private_data;
+        if (!dev || dev->session != session) {
+                err = -EINVAL;
+                goto fdput_fd;
+        }
+
+        switch (api_domain) {
+        case NVGPU_CLK_DOMAIN_MCLK:
+                dev->mclk_target_mhz = target_mhz;
+                break;
+
+        case NVGPU_CLK_DOMAIN_GPCCLK:
+                dev->gpc2clk_target_mhz = target_mhz * 2ULL;
+                break;
+
+        default:
+                err = -EINVAL;
+        }
+
+fdput_fd:
+        fdput(fd);
+        return err;
+}
+
+u32 nvgpu_clk_arb_get_arbiter_clk_domains(struct gk20a *g)
+{
+        u32 clk_domains = g->ops.clk_arb.get_arbiter_clk_domains(g);
+        u32 api_domains = 0;
+
+        if (clk_domains & CTRL_CLK_DOMAIN_GPC2CLK)
+                api_domains |= BIT(NVGPU_GPU_CLK_DOMAIN_GPCCLK);
+
+        if (clk_domains & CTRL_CLK_DOMAIN_MCLK)
+                api_domains |= BIT(NVGPU_GPU_CLK_DOMAIN_MCLK);
+
+        return api_domains;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static int nvgpu_clk_arb_stats_show(struct seq_file *s, void *unused)
+{
+        struct gk20a *g = s->private;
+        struct nvgpu_clk_arb *arb = g->clk_arb;
+        struct nvgpu_clk_arb_debug *debug;
+
+        u64 num;
+        s64 tmp, avg, std, max, min;
+
+        debug = NV_ACCESS_ONCE(arb->debug);
+        /* Make copy of structure and ensure no reordering */
+        nvgpu_smp_rmb();
+        if (!debug)
+                return -EINVAL;
+
+        std = debug->switch_std;
+        avg = debug->switch_avg;
+        max = debug->switch_max;
+        min = debug->switch_min;
+        num = debug->switch_num;
+
+        tmp = std;
+        do_div(tmp, num);
+        seq_printf(s, "Number of transitions: %lld\n",
+                num);
+        seq_printf(s, "max / min : %lld / %lld usec\n",
+                max, min);
+        seq_printf(s, "avg / std : %lld / %ld usec\n",
+                avg, int_sqrt(tmp));
+
+        return 0;
+}
+
+static int nvgpu_clk_arb_stats_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, nvgpu_clk_arb_stats_show, inode->i_private);
+}
+
+static const struct file_operations nvgpu_clk_arb_stats_fops = {
+        .open           = nvgpu_clk_arb_stats_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+
+int nvgpu_clk_arb_debugfs_init(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct dentry *gpu_root = l->debugfs;
+        struct dentry *d;
+
+        nvgpu_log(g, gpu_dbg_info, "g=%p", g);
+
+        d = debugfs_create_file(
+                        "arb_stats",
+                        S_IRUGO,
+                        gpu_root,
+                        g,
+                        &nvgpu_clk_arb_stats_fops);
+        if (!d)
+                return -ENOMEM;
+
+        return 0;
+}
+#endif
diff --git a/include/os/linux/ioctl_ctrl.c b/include/os/linux/ioctl_ctrl.c
new file mode 100644
index 0000000..ee141ff
--- /dev/null
+++ b/include/os/linux/ioctl_ctrl.c
@@ -0,0 +1,2106 @@
+/*
+ * Copyright (c) 2011-2020, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/uaccess.h>
+#include <linux/cdev.h>
+#include <linux/file.h>
+#include <linux/anon_inodes.h>
+#include <linux/fs.h>
+#include <linux/pm_runtime.h>
+#include <uapi/linux/nvgpu.h>
+
+#include <nvgpu/bitops.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/ptimer.h>
+#include <nvgpu/vidmem.h>
+#include <nvgpu/log.h>
+#include <nvgpu/enabled.h>
+#include <nvgpu/sizes.h>
+#include <nvgpu/list.h>
+#include <nvgpu/clk_arb.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/channel.h>
+
+#include "ioctl_ctrl.h"
+#include "ioctl_dbg.h"
+#include "ioctl_as.h"
+#include "ioctl_tsg.h"
+#include "ioctl_channel.h"
+#include "gk20a/fence_gk20a.h"
+
+#include "platform_gk20a.h"
+#include "os_linux.h"
+#include "dmabuf.h"
+#include "channel.h"
+#include "dmabuf_vidmem.h"
+
+#define HZ_TO_MHZ(a) ((a > 0xF414F9CD7ULL) ? 0xffff : (a >> 32) ? \
+        (u32) ((a * 0x10C8ULL) >> 32) : (u16) ((u32) a/MHZ))
+#define MHZ_TO_HZ(a) ((u64)a * MHZ)
+
+struct gk20a_ctrl_priv {
+        struct device *dev;
+        struct gk20a *g;
+        struct nvgpu_clk_session *clk_session;
+
+        struct nvgpu_list_node list;
+        struct {
+                struct vm_area_struct *vma;
+                unsigned long flags;
+                bool vma_mapped;
+        } usermode_vma;
+};
+
+static inline struct gk20a_ctrl_priv *
+gk20a_ctrl_priv_from_list(struct nvgpu_list_node *node)
+{
+        return (struct gk20a_ctrl_priv *)
+                ((uintptr_t)node - offsetof(struct gk20a_ctrl_priv, list));
+}
+
+static u32 gk20a_as_translate_as_alloc_flags(struct gk20a *g, u32 flags)
+{
+        u32 core_flags = 0;
+
+        if (flags & NVGPU_GPU_IOCTL_ALLOC_AS_FLAGS_USERSPACE_MANAGED)
+                core_flags |= NVGPU_AS_ALLOC_USERSPACE_MANAGED;
+
+        return core_flags;
+}
+
+int gk20a_ctrl_dev_open(struct inode *inode, struct file *filp)
+{
+        struct nvgpu_os_linux *l;
+        struct gk20a *g;
+        struct gk20a_ctrl_priv *priv;
+        int err = 0;
+
+        l = container_of(inode->i_cdev,
+                         struct nvgpu_os_linux, ctrl.cdev);
+        g = gk20a_get(&l->g);
+        if (!g)
+                return -ENODEV;
+
+        nvgpu_log_fn(g, " ");
+
+        priv = nvgpu_kzalloc(g, sizeof(struct gk20a_ctrl_priv));
+        if (!priv) {
+                err = -ENOMEM;
+                goto free_ref;
+        }
+        filp->private_data = priv;
+        priv->dev = dev_from_gk20a(g);
+        /*
+         * We dont close the arbiter fd's after driver teardown to support
+         * GPU_LOST events, so we store g here, instead of dereferencing the
+         * dev structure on teardown
+         */
+        priv->g = g;
+
+        if (!g->sw_ready) {
+                err = gk20a_busy(g);
+                if (err)
+                        goto free_ref;
+                gk20a_idle(g);
+        }
+
+        err = nvgpu_clk_arb_init_session(g, &priv->clk_session);
+free_ref:
+        if (err != 0) {
+                gk20a_put(g);
+                if (priv)
+                        nvgpu_kfree(g, priv);
+        } else {
+                nvgpu_mutex_acquire(&l->ctrl.privs_lock);
+                nvgpu_list_add(&priv->list, &l->ctrl.privs);
+                nvgpu_mutex_release(&l->ctrl.privs_lock);
+        }
+
+        return err;
+}
+int gk20a_ctrl_dev_release(struct inode *inode, struct file *filp)
+{
+        struct gk20a_ctrl_priv *priv = filp->private_data;
+        struct gk20a *g = priv->g;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        nvgpu_log_fn(g, " ");
+
+        nvgpu_mutex_acquire(&l->ctrl.privs_lock);
+        nvgpu_list_del(&priv->list);
+        nvgpu_mutex_release(&l->ctrl.privs_lock);
+
+        if (priv->clk_session)
+                nvgpu_clk_arb_release_session(g, priv->clk_session);
+
+        gk20a_put(g);
+        nvgpu_kfree(g, priv);
+
+        return 0;
+}
+
+struct nvgpu_flags_mapping {
+        u64 ioctl_flag;
+        int enabled_flag;
+};
+
+static struct nvgpu_flags_mapping flags_mapping[] = {
+        {NVGPU_GPU_FLAGS_CAN_RAILGATE,
+                NVGPU_CAN_RAILGATE},
+        {NVGPU_GPU_FLAGS_HAS_SYNCPOINTS,
+                NVGPU_HAS_SYNCPOINTS},
+        {NVGPU_GPU_FLAGS_SUPPORT_PARTIAL_MAPPINGS,
+                NVGPU_SUPPORT_PARTIAL_MAPPINGS},
+        {NVGPU_GPU_FLAGS_SUPPORT_SPARSE_ALLOCS,
+                NVGPU_SUPPORT_SPARSE_ALLOCS},
+        {NVGPU_GPU_FLAGS_SUPPORT_SYNC_FENCE_FDS,
+                NVGPU_SUPPORT_SYNC_FENCE_FDS},
+        {NVGPU_GPU_FLAGS_SUPPORT_CYCLE_STATS,
+                NVGPU_SUPPORT_CYCLE_STATS},
+        {NVGPU_GPU_FLAGS_SUPPORT_CYCLE_STATS_SNAPSHOT,
+                NVGPU_SUPPORT_CYCLE_STATS_SNAPSHOT},
+        {NVGPU_GPU_FLAGS_SUPPORT_USERSPACE_MANAGED_AS,
+                NVGPU_SUPPORT_USERSPACE_MANAGED_AS},
+        {NVGPU_GPU_FLAGS_SUPPORT_TSG,
+                NVGPU_SUPPORT_TSG},
+        {NVGPU_GPU_FLAGS_SUPPORT_CLOCK_CONTROLS,
+                NVGPU_SUPPORT_CLOCK_CONTROLS},
+        {NVGPU_GPU_FLAGS_SUPPORT_GET_VOLTAGE,
+                NVGPU_SUPPORT_GET_VOLTAGE},
+        {NVGPU_GPU_FLAGS_SUPPORT_GET_CURRENT,
+                NVGPU_SUPPORT_GET_CURRENT},
+        {NVGPU_GPU_FLAGS_SUPPORT_GET_POWER,
+                NVGPU_SUPPORT_GET_POWER},
+        {NVGPU_GPU_FLAGS_SUPPORT_GET_TEMPERATURE,
+                NVGPU_SUPPORT_GET_TEMPERATURE},
+        {NVGPU_GPU_FLAGS_SUPPORT_SET_THERM_ALERT_LIMIT,
+                NVGPU_SUPPORT_SET_THERM_ALERT_LIMIT},
+        {NVGPU_GPU_FLAGS_SUPPORT_DEVICE_EVENTS,
+                NVGPU_SUPPORT_DEVICE_EVENTS},
+        {NVGPU_GPU_FLAGS_SUPPORT_FECS_CTXSW_TRACE,
+                NVGPU_SUPPORT_FECS_CTXSW_TRACE},
+        {NVGPU_GPU_FLAGS_SUPPORT_DETERMINISTIC_SUBMIT_NO_JOBTRACKING,
+                NVGPU_SUPPORT_DETERMINISTIC_SUBMIT_NO_JOBTRACKING},
+        {NVGPU_GPU_FLAGS_SUPPORT_DETERMINISTIC_SUBMIT_FULL,
+                NVGPU_SUPPORT_DETERMINISTIC_SUBMIT_FULL},
+        {NVGPU_GPU_FLAGS_SUPPORT_DETERMINISTIC_OPTS,
+                NVGPU_SUPPORT_DETERMINISTIC_OPTS},
+        {NVGPU_GPU_FLAGS_SUPPORT_SYNCPOINT_ADDRESS,
+                NVGPU_SUPPORT_SYNCPOINT_ADDRESS},
+        {NVGPU_GPU_FLAGS_SUPPORT_USER_SYNCPOINT,
+                NVGPU_SUPPORT_USER_SYNCPOINT},
+        {NVGPU_GPU_FLAGS_SUPPORT_USERMODE_SUBMIT,
+                NVGPU_SUPPORT_USERMODE_SUBMIT},
+        {NVGPU_GPU_FLAGS_SUPPORT_IO_COHERENCE,
+                NVGPU_SUPPORT_IO_COHERENCE},
+        {NVGPU_GPU_FLAGS_SUPPORT_RESCHEDULE_RUNLIST,
+                NVGPU_SUPPORT_RESCHEDULE_RUNLIST},
+        {NVGPU_GPU_FLAGS_SUPPORT_MAP_DIRECT_KIND_CTRL,
+                NVGPU_SUPPORT_MAP_DIRECT_KIND_CTRL},
+        {NVGPU_GPU_FLAGS_ECC_ENABLED_SM_LRF,
+                NVGPU_ECC_ENABLED_SM_LRF},
+        {NVGPU_GPU_FLAGS_ECC_ENABLED_SM_SHM,
+                NVGPU_ECC_ENABLED_SM_SHM},
+        {NVGPU_GPU_FLAGS_ECC_ENABLED_TEX,
+                NVGPU_ECC_ENABLED_TEX},
+        {NVGPU_GPU_FLAGS_ECC_ENABLED_LTC,
+                NVGPU_ECC_ENABLED_LTC},
+        {NVGPU_GPU_FLAGS_SUPPORT_TSG_SUBCONTEXTS,
+                NVGPU_SUPPORT_TSG_SUBCONTEXTS},
+        {NVGPU_GPU_FLAGS_SUPPORT_SCG,
+                NVGPU_SUPPORT_SCG},
+        {NVGPU_GPU_FLAGS_SUPPORT_VPR,
+                NVGPU_SUPPORT_VPR},
+        {NVGPU_GPU_FLAGS_SUPPORT_SET_CTX_MMU_DEBUG_MODE,
+                NVGPU_SUPPORT_SET_CTX_MMU_DEBUG_MODE},
+};
+
+static u64 nvgpu_ctrl_ioctl_gpu_characteristics_flags(struct gk20a *g)
+{
+        unsigned int i;
+        u64 ioctl_flags = 0;
+
+        for (i = 0; i < sizeof(flags_mapping)/sizeof(*flags_mapping); i++) {
+                if (nvgpu_is_enabled(g, flags_mapping[i].enabled_flag))
+                        ioctl_flags |= flags_mapping[i].ioctl_flag;
+        }
+
+        if (!capable(CAP_SYS_NICE)) {
+                ioctl_flags &= ~NVGPU_GPU_FLAGS_SUPPORT_RESCHEDULE_RUNLIST;
+        }
+
+        return ioctl_flags;
+}
+
+static void nvgpu_set_preemption_mode_flags(struct gk20a *g,
+        struct nvgpu_gpu_characteristics *gpu)
+{
+        struct nvgpu_preemption_modes_rec preemption_mode_rec;
+
+        g->ops.gr.get_preemption_mode_flags(g, &preemption_mode_rec);
+
+        gpu->graphics_preemption_mode_flags =
+                nvgpu_get_ioctl_graphics_preempt_mode_flags(
+                        preemption_mode_rec.graphics_preemption_mode_flags);
+        gpu->compute_preemption_mode_flags =
+                nvgpu_get_ioctl_compute_preempt_mode_flags(
+                        preemption_mode_rec.compute_preemption_mode_flags);
+
+        gpu->default_graphics_preempt_mode =
+                nvgpu_get_ioctl_graphics_preempt_mode(
+                        preemption_mode_rec.default_graphics_preempt_mode);
+        gpu->default_compute_preempt_mode =
+                nvgpu_get_ioctl_compute_preempt_mode(
+                        preemption_mode_rec.default_compute_preempt_mode);
+}
+
+static long
+gk20a_ctrl_ioctl_gpu_characteristics(
+        struct gk20a *g,
+        struct nvgpu_gpu_get_characteristics *request)
+{
+        struct nvgpu_gpu_characteristics gpu;
+        long err = 0;
+
+        if (gk20a_busy(g)) {
+                nvgpu_err(g, "failed to power on gpu");
+                return -EINVAL;
+        }
+
+        memset(&gpu, 0, sizeof(gpu));
+
+        gpu.L2_cache_size = g->ops.ltc.determine_L2_size_bytes(g);
+        gpu.on_board_video_memory_size = 0; /* integrated GPU */
+
+        gpu.num_gpc = g->gr.gpc_count;
+        gpu.max_gpc_count = g->gr.max_gpc_count;
+
+        gpu.num_tpc_per_gpc = g->gr.max_tpc_per_gpc_count;
+
+        gpu.bus_type = NVGPU_GPU_BUS_TYPE_AXI; /* always AXI for now */
+
+        gpu.compression_page_size = g->ops.fb.compression_page_size(g);
+
+        if (g->ops.gr.get_gpc_mask) {
+                gpu.gpc_mask = g->ops.gr.get_gpc_mask(g);
+        } else {
+                gpu.gpc_mask = BIT32(g->gr.gpc_count) - 1;
+        }
+
+        gpu.flags = nvgpu_ctrl_ioctl_gpu_characteristics_flags(g);
+
+        gpu.arch = g->params.gpu_arch;
+        gpu.impl = g->params.gpu_impl;
+        gpu.rev = g->params.gpu_rev;
+        gpu.reg_ops_limit = NVGPU_IOCTL_DBG_REG_OPS_LIMIT;
+        gpu.map_buffer_batch_limit = nvgpu_is_enabled(g, NVGPU_SUPPORT_MAP_BUFFER_BATCH) ?
+                NVGPU_IOCTL_AS_MAP_BUFFER_BATCH_LIMIT : 0;
+        gpu.twod_class = g->ops.get_litter_value(g, GPU_LIT_TWOD_CLASS);
+        gpu.threed_class = g->ops.get_litter_value(g, GPU_LIT_THREED_CLASS);
+        gpu.compute_class = g->ops.get_litter_value(g, GPU_LIT_COMPUTE_CLASS);
+        gpu.gpfifo_class = g->ops.get_litter_value(g, GPU_LIT_GPFIFO_CLASS);
+        gpu.inline_to_memory_class =
+                g->ops.get_litter_value(g, GPU_LIT_I2M_CLASS);
+        gpu.dma_copy_class =
+                g->ops.get_litter_value(g, GPU_LIT_DMA_COPY_CLASS);
+
+        gpu.vbios_version = g->bios.vbios_version;
+        gpu.vbios_oem_version = g->bios.vbios_oem_version;
+
+        gpu.big_page_size = nvgpu_mm_get_default_big_page_size(g);
+        gpu.pde_coverage_bit_count =
+                g->ops.mm.get_mmu_levels(g, gpu.big_page_size)[0].lo_bit[0];
+        gpu.available_big_page_sizes = nvgpu_mm_get_available_big_page_sizes(g);
+
+        gpu.sm_arch_sm_version = g->params.sm_arch_sm_version;
+        gpu.sm_arch_spa_version = g->params.sm_arch_spa_version;
+        gpu.sm_arch_warp_count = g->params.sm_arch_warp_count;
+
+        gpu.max_css_buffer_size = g->gr.max_css_buffer_size;
+
+        gpu.gpu_ioctl_nr_last = NVGPU_GPU_IOCTL_LAST;
+        gpu.tsg_ioctl_nr_last = NVGPU_TSG_IOCTL_LAST;
+        gpu.dbg_gpu_ioctl_nr_last = NVGPU_DBG_GPU_IOCTL_LAST;
+        gpu.ioctl_channel_nr_last = NVGPU_IOCTL_CHANNEL_LAST;
+        gpu.as_ioctl_nr_last = NVGPU_AS_IOCTL_LAST;
+        gpu.event_ioctl_nr_last = NVGPU_EVENT_IOCTL_LAST;
+        gpu.gpu_va_bit_count = 40;
+
+        strlcpy(gpu.chipname, g->name, sizeof(gpu.chipname));
+        gpu.max_fbps_count = g->ops.gr.get_max_fbps_count(g);
+        gpu.fbp_en_mask = g->ops.gr.get_fbp_en_mask(g);
+        gpu.max_ltc_per_fbp =  g->ops.gr.get_max_ltc_per_fbp(g);
+        gpu.max_lts_per_ltc = g->ops.gr.get_max_lts_per_ltc(g);
+        gpu.gr_compbit_store_base_hw = g->gr.compbit_store.base_hw;
+        gpu.gr_gobs_per_comptagline_per_slice =
+                g->gr.gobs_per_comptagline_per_slice;
+        gpu.num_ltc = g->ltc_count;
+        gpu.lts_per_ltc = g->gr.slices_per_ltc;
+        gpu.cbc_cache_line_size = g->gr.cacheline_size;
+        gpu.cbc_comptags_per_line = g->gr.comptags_per_cacheline;
+
+        if (g->ops.clk.get_maxrate)
+                gpu.max_freq = g->ops.clk.get_maxrate(g, CTRL_CLK_DOMAIN_GPCCLK);
+
+        gpu.local_video_memory_size = g->mm.vidmem.size;
+
+        gpu.pci_vendor_id = g->pci_vendor_id;
+        gpu.pci_device_id = g->pci_device_id;
+        gpu.pci_subsystem_vendor_id = g->pci_subsystem_vendor_id;
+        gpu.pci_subsystem_device_id = g->pci_subsystem_device_id;
+        gpu.pci_class = g->pci_class;
+        gpu.pci_revision = g->pci_revision;
+
+        nvgpu_set_preemption_mode_flags(g, &gpu);
+
+        if (request->gpu_characteristics_buf_size > 0) {
+                size_t write_size = sizeof(gpu);
+
+                nvgpu_speculation_barrier();
+                if (write_size > request->gpu_characteristics_buf_size)
+                        write_size = request->gpu_characteristics_buf_size;
+
+                err = copy_to_user((void __user *)(uintptr_t)
+                                   request->gpu_characteristics_buf_addr,
+                                   &gpu, write_size);
+        }
+
+        if (err == 0)
+                request->gpu_characteristics_buf_size = sizeof(gpu);
+
+        gk20a_idle(g);
+
+        return err;
+}
+
+static int gk20a_ctrl_prepare_compressible_read(
+                struct gk20a *g,
+                struct nvgpu_gpu_prepare_compressible_read_args *args)
+{
+        int ret = -ENOSYS;
+
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct nvgpu_channel_fence fence;
+        struct gk20a_fence *fence_out = NULL;
+        int submit_flags = nvgpu_submit_gpfifo_user_flags_to_common_flags(
+                args->submit_flags);
+        int fd = -1;
+
+        fence.id = args->fence.syncpt_id;
+        fence.value = args->fence.syncpt_value;
+
+        /* Try and allocate an fd here*/
+        if ((submit_flags & NVGPU_SUBMIT_FLAGS_FENCE_GET)
+                && (submit_flags & NVGPU_SUBMIT_FLAGS_SYNC_FENCE)) {
+                        fd = get_unused_fd_flags(O_RDWR);
+                        if (fd < 0)
+                                return fd;
+        }
+
+        ret = gk20a_prepare_compressible_read(l, args->handle,
+                        args->request_compbits, args->offset,
+                        args->compbits_hoffset, args->compbits_voffset,
+                        args->scatterbuffer_offset,
+                        args->width, args->height, args->block_height_log2,
+                        submit_flags, &fence, &args->valid_compbits,
+                        &args->zbc_color, &fence_out);
+
+        if (ret) {
+                if (fd != -1)
+                        put_unused_fd(fd);
+                return ret;
+        }
+
+        /* Convert fence_out to something we can pass back to user space. */
+        if (submit_flags & NVGPU_SUBMIT_FLAGS_FENCE_GET) {
+                if (submit_flags & NVGPU_SUBMIT_FLAGS_SYNC_FENCE) {
+                        if (fence_out) {
+                                ret = gk20a_fence_install_fd(fence_out, fd);
+                                if (ret)
+                                        put_unused_fd(fd);
+                                else
+                                        args->fence.fd = fd;
+                        } else {
+                                args->fence.fd = -1;
+                                put_unused_fd(fd);
+                        }
+                } else {
+                        if (fence_out) {
+                                args->fence.syncpt_id = fence_out->syncpt_id;
+                                args->fence.syncpt_value =
+                                                fence_out->syncpt_value;
+                        } else {
+                                args->fence.syncpt_id = -1;
+                                args->fence.syncpt_value = 0;
+                        }
+                }
+        }
+        gk20a_fence_put(fence_out);
+#endif
+
+        return ret;
+}
+
+static int gk20a_ctrl_mark_compressible_write(
+                struct gk20a *g,
+                struct nvgpu_gpu_mark_compressible_write_args *args)
+{
+        int ret = -ENOSYS;
+
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        ret = gk20a_mark_compressible_write(g, args->handle,
+                        args->valid_compbits, args->offset, args->zbc_color);
+#endif
+
+        return ret;
+}
+
+static int gk20a_ctrl_alloc_as(
+                struct gk20a *g,
+                struct nvgpu_alloc_as_args *args)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct gk20a_as_share *as_share;
+        int err;
+        int fd;
+        struct file *file;
+        char name[64];
+
+        err = get_unused_fd_flags(O_RDWR);
+        if (err < 0)
+                return err;
+        fd = err;
+
+        snprintf(name, sizeof(name), "nvhost-%s-fd%d", g->name, fd);
+
+        file = anon_inode_getfile(name, l->as_dev.cdev.ops, NULL, O_RDWR);
+        if (IS_ERR(file)) {
+                err = PTR_ERR(file);
+                goto clean_up;
+        }
+
+        err = gk20a_as_alloc_share(g, args->big_page_size,
+                                   gk20a_as_translate_as_alloc_flags(g,
+                                           args->flags),
+                                   &as_share);
+        if (err)
+                goto clean_up_file;
+
+        fd_install(fd, file);
+        file->private_data = as_share;
+
+        args->as_fd = fd;
+        return 0;
+
+clean_up_file:
+        fput(file);
+clean_up:
+        put_unused_fd(fd);
+        return err;
+}
+
+static int gk20a_ctrl_open_tsg(struct gk20a *g,
+                               struct nvgpu_gpu_open_tsg_args *args)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        int err;
+        int fd;
+        struct file *file;
+        char name[64];
+
+        err = get_unused_fd_flags(O_RDWR);
+        if (err < 0)
+                return err;
+        fd = err;
+
+        snprintf(name, sizeof(name), "nvgpu-%s-tsg%d", g->name, fd);
+
+        file = anon_inode_getfile(name, l->tsg.cdev.ops, NULL, O_RDWR);
+        if (IS_ERR(file)) {
+                err = PTR_ERR(file);
+                goto clean_up;
+        }
+
+        err = nvgpu_ioctl_tsg_open(g, file);
+        if (err)
+                goto clean_up_file;
+
+        fd_install(fd, file);
+        args->tsg_fd = fd;
+        return 0;
+
+clean_up_file:
+        fput(file);
+clean_up:
+        put_unused_fd(fd);
+        return err;
+}
+
+static int gk20a_ctrl_get_tpc_masks(struct gk20a *g,
+                                    struct nvgpu_gpu_get_tpc_masks_args *args)
+{
+        struct gr_gk20a *gr = &g->gr;
+        int err = 0;
+        const u32 gpc_tpc_mask_size = sizeof(u32) * gr->max_gpc_count;
+
+        if (args->mask_buf_size > 0) {
+                size_t write_size = gpc_tpc_mask_size;
+
+                nvgpu_speculation_barrier();
+                if (write_size > args->mask_buf_size)
+                        write_size = args->mask_buf_size;
+
+                err = copy_to_user((void __user *)(uintptr_t)
+                                   args->mask_buf_addr,
+                                   gr->gpc_tpc_mask, write_size);
+        }
+
+        if (err == 0)
+                args->mask_buf_size = gpc_tpc_mask_size;
+
+        return err;
+}
+
+static int gk20a_ctrl_get_fbp_l2_masks(
+        struct gk20a *g, struct nvgpu_gpu_get_fbp_l2_masks_args *args)
+{
+        struct gr_gk20a *gr = &g->gr;
+        int err = 0;
+        const u32 fbp_l2_mask_size = sizeof(u32) * gr->max_fbps_count;
+
+        if (args->mask_buf_size > 0) {
+                size_t write_size = fbp_l2_mask_size;
+
+                nvgpu_speculation_barrier();
+                if (write_size > args->mask_buf_size)
+                        write_size = args->mask_buf_size;
+
+                err = copy_to_user((void __user *)(uintptr_t)
+                                   args->mask_buf_addr,
+                                   gr->fbp_rop_l2_en_mask, write_size);
+        }
+
+        if (err == 0)
+                args->mask_buf_size = fbp_l2_mask_size;
+
+        return err;
+}
+
+static int nvgpu_gpu_ioctl_l2_fb_ops(struct gk20a *g,
+                struct nvgpu_gpu_l2_fb_args *args)
+{
+        int ret;
+        bool always_poweron;
+
+        if ((!args->l2_flush && !args->fb_flush) ||
+            (!args->l2_flush && args->l2_invalidate))
+                return -EINVAL;
+
+        /* Handle this case for joint rails or DGPU */
+        always_poweron = (!nvgpu_is_enabled(g, NVGPU_CAN_RAILGATE) ||
+                                !pm_runtime_enabled(dev_from_gk20a(g)));
+
+        /* In case of not always power_on, exit if g->power_on is false */
+        if (!always_poweron && !gk20a_check_poweron(g)) {
+                return 0;
+        }
+
+        /* There is a small window between a call to gk20a_idle() has occured
+         * and railgate being actually triggered(setting g->power_on = false),
+         * when l2_flush can race with railgate. Its better to take a busy_lock
+         * to prevent the gk20a_idle() from proceeding. There is a very small
+         * chance that gk20a_idle() might begin before gk20a_busy(). Having
+         * a locked access to g->power_on further reduces the probability of
+         * gk20a_idle() being triggered before gk20a_busy()
+         */
+        ret = gk20a_busy(g);
+
+        if (ret != 0) {
+                nvgpu_err(g, "failed to take power ref");
+                return ret;
+        }
+
+        if (args->l2_flush)
+                g->ops.mm.l2_flush(g, args->l2_invalidate ? true : false);
+
+        if (args->fb_flush)
+                g->ops.mm.fb_flush(g);
+
+        gk20a_idle(g);
+
+        return 0;
+}
+
+static int nvgpu_gpu_ioctl_set_mmu_debug_mode(
+                struct gk20a *g,
+                struct nvgpu_gpu_mmu_debug_mode_args *args)
+{
+        if (gk20a_busy(g)) {
+                nvgpu_err(g, "failed to power on gpu");
+                return -EINVAL;
+        }
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        g->ops.fb.set_debug_mode(g, args->state == 1);
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        gk20a_idle(g);
+        return 0;
+}
+
+static int nvgpu_gpu_ioctl_set_debug_mode(
+                struct gk20a *g,
+                struct nvgpu_gpu_sm_debug_mode_args *args)
+{
+        struct channel_gk20a *ch;
+        int err;
+
+        ch = gk20a_get_channel_from_file(args->channel_fd);
+        if (!ch)
+                return -EINVAL;
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        if (g->ops.gr.set_sm_debug_mode)
+                err = g->ops.gr.set_sm_debug_mode(g, ch,
+                                args->sms, !!args->enable);
+        else
+                err = -ENOSYS;
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        gk20a_channel_put(ch);
+        return err;
+}
+
+static int nvgpu_gpu_ioctl_trigger_suspend(struct gk20a *g)
+{
+        int err;
+
+        err = gk20a_busy(g);
+        if (err)
+            return err;
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        err = gr_gk20a_elpg_protected_call(g,
+                        g->ops.gr.trigger_suspend(g));
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        gk20a_idle(g);
+
+        return err;
+}
+
+static int nvgpu_gpu_ioctl_wait_for_pause(struct gk20a *g,
+                struct nvgpu_gpu_wait_pause_args *args)
+{
+        int err;
+        struct warpstate *ioctl_w_state;
+        struct nvgpu_warpstate *w_state = NULL;
+        u32 sm_count, ioctl_size, size, sm_id;
+
+        sm_count = g->gr.gpc_count * g->gr.tpc_count;
+
+        ioctl_size = sm_count * sizeof(struct warpstate);
+        ioctl_w_state = nvgpu_kzalloc(g, ioctl_size);
+        if (!ioctl_w_state)
+                return -ENOMEM;
+
+        size = sm_count * sizeof(struct nvgpu_warpstate);
+        w_state = nvgpu_kzalloc(g, size);
+        if (!w_state) {
+                err = -ENOMEM;
+                goto out_free;
+        }
+
+        err = gk20a_busy(g);
+        if (err)
+                goto out_free;
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        (void)gr_gk20a_elpg_protected_call(g,
+                        g->ops.gr.wait_for_pause(g, w_state));
+
+        for (sm_id = 0; sm_id < g->gr.no_of_sm; sm_id++) {
+                ioctl_w_state[sm_id].valid_warps[0] =
+                        w_state[sm_id].valid_warps[0];
+                ioctl_w_state[sm_id].valid_warps[1] =
+                        w_state[sm_id].valid_warps[1];
+                ioctl_w_state[sm_id].trapped_warps[0] =
+                        w_state[sm_id].trapped_warps[0];
+                ioctl_w_state[sm_id].trapped_warps[1] =
+                        w_state[sm_id].trapped_warps[1];
+                ioctl_w_state[sm_id].paused_warps[0] =
+                        w_state[sm_id].paused_warps[0];
+                ioctl_w_state[sm_id].paused_warps[1] =
+                        w_state[sm_id].paused_warps[1];
+        }
+        /* Copy to user space - pointed by "args->pwarpstate" */
+        if (copy_to_user((void __user *)(uintptr_t)args->pwarpstate,
+            w_state, ioctl_size)) {
+                nvgpu_log_fn(g, "copy_to_user failed!");
+                err = -EFAULT;
+        }
+
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        gk20a_idle(g);
+
+out_free:
+        nvgpu_kfree(g, w_state);
+        nvgpu_kfree(g, ioctl_w_state);
+
+        return err;
+}
+
+static int nvgpu_gpu_ioctl_resume_from_pause(struct gk20a *g)
+{
+        int err;
+
+        err = gk20a_busy(g);
+        if (err)
+            return err;
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        err = gr_gk20a_elpg_protected_call(g,
+                        g->ops.gr.resume_from_pause(g));
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        gk20a_idle(g);
+
+        return err;
+}
+
+static int nvgpu_gpu_ioctl_clear_sm_errors(struct gk20a *g)
+{
+        int err;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        err = gr_gk20a_elpg_protected_call(g,
+                        g->ops.gr.clear_sm_errors(g));
+
+        gk20a_idle(g);
+
+        return err;
+}
+
+static int nvgpu_gpu_ioctl_has_any_exception(
+                struct gk20a *g,
+                struct nvgpu_gpu_tpc_exception_en_status_args *args)
+{
+        u32 tpc_exception_en;
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        tpc_exception_en = g->ops.gr.tpc_enabled_exceptions(g);
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        args->tpc_exception_en_sm_mask = tpc_exception_en;
+
+        return 0;
+}
+
+static int gk20a_ctrl_get_num_vsms(struct gk20a *g,
+                                    struct nvgpu_gpu_num_vsms *args)
+{
+        struct gr_gk20a *gr = &g->gr;
+        args->num_vsms = gr->no_of_sm;
+        return 0;
+}
+
+static int gk20a_ctrl_vsm_mapping(struct gk20a *g,
+                                    struct nvgpu_gpu_vsms_mapping *args)
+{
+        int err = 0;
+        struct gr_gk20a *gr = &g->gr;
+        size_t write_size = gr->no_of_sm *
+                                sizeof(struct nvgpu_gpu_vsms_mapping_entry);
+        struct nvgpu_gpu_vsms_mapping_entry *vsms_buf;
+        u32 i;
+
+        vsms_buf = nvgpu_kzalloc(g, write_size);
+        if (vsms_buf == NULL)
+                return -ENOMEM;
+
+        for (i = 0; i < gr->no_of_sm; i++) {
+                vsms_buf[i].gpc_index = gr->sm_to_cluster[i].gpc_index;
+                if (g->ops.gr.get_nonpes_aware_tpc)
+                        vsms_buf[i].tpc_index =
+                                g->ops.gr.get_nonpes_aware_tpc(g,
+                                        gr->sm_to_cluster[i].gpc_index,
+                                        gr->sm_to_cluster[i].tpc_index);
+                else
+                        vsms_buf[i].tpc_index =
+                                gr->sm_to_cluster[i].tpc_index;
+        }
+
+        err = copy_to_user((void __user *)(uintptr_t)
+                           args->vsms_map_buf_addr,
+                           vsms_buf, write_size);
+        nvgpu_kfree(g, vsms_buf);
+
+        return err;
+}
+
+static int nvgpu_gpu_get_cpu_time_correlation_info(
+        struct gk20a *g,
+        struct nvgpu_gpu_get_cpu_time_correlation_info_args *args)
+{
+        struct nvgpu_cpu_time_correlation_sample *samples;
+        int err;
+        u32 i;
+
+        if (args->count > NVGPU_GPU_GET_CPU_TIME_CORRELATION_INFO_MAX_COUNT ||
+            args->source_id != NVGPU_GPU_GET_CPU_TIME_CORRELATION_INFO_SRC_ID_TSC)
+                return -EINVAL;
+
+        samples = nvgpu_kzalloc(g, args->count *
+                sizeof(struct nvgpu_cpu_time_correlation_sample));
+        if (!samples) {
+                return -ENOMEM;
+        }
+
+        err = g->ops.ptimer.get_timestamps_zipper(g,
+                        args->source_id, args->count, samples);
+        if (!err) {
+                for (i = 0; i < args->count; i++) {
+                        args->samples[i].cpu_timestamp = samples[i].cpu_timestamp;
+                        args->samples[i].gpu_timestamp = samples[i].gpu_timestamp;
+                }
+        }
+
+        nvgpu_kfree(g, samples);
+
+        return err;
+}
+
+static int nvgpu_gpu_get_gpu_time(
+        struct gk20a *g,
+        struct nvgpu_gpu_get_gpu_time_args *args)
+{
+        u64 time;
+        int err;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        err = g->ops.ptimer.read_ptimer(g, &time);
+        if (!err)
+                args->gpu_timestamp = time;
+
+        gk20a_idle(g);
+        return err;
+}
+
+static int nvgpu_gpu_get_engine_info(
+        struct gk20a *g,
+        struct nvgpu_gpu_get_engine_info_args *args)
+{
+        int err = 0;
+        u32 engine_enum = ENGINE_INVAL_GK20A;
+        u32 report_index = 0;
+        u32 engine_id_idx;
+        const u32 max_buffer_engines = args->engine_info_buf_size /
+                sizeof(struct nvgpu_gpu_get_engine_info_item);
+        struct nvgpu_gpu_get_engine_info_item __user *dst_item_list =
+                (void __user *)(uintptr_t)args->engine_info_buf_addr;
+
+        for (engine_id_idx = 0; engine_id_idx < g->fifo.num_engines;
+                ++engine_id_idx) {
+                u32 active_engine_id = g->fifo.active_engines_list[engine_id_idx];
+                const struct fifo_engine_info_gk20a *src_info =
+                        &g->fifo.engine_info[active_engine_id];
+                struct nvgpu_gpu_get_engine_info_item dst_info;
+
+                memset(&dst_info, 0, sizeof(dst_info));
+
+                engine_enum = src_info->engine_enum;
+
+                switch (engine_enum) {
+                case ENGINE_GR_GK20A:
+                        dst_info.engine_id = NVGPU_GPU_ENGINE_ID_GR;
+                        break;
+
+                case ENGINE_GRCE_GK20A:
+                        dst_info.engine_id = NVGPU_GPU_ENGINE_ID_GR_COPY;
+                        break;
+
+                case ENGINE_ASYNC_CE_GK20A:
+                        dst_info.engine_id = NVGPU_GPU_ENGINE_ID_ASYNC_COPY;
+                        break;
+
+                default:
+                        nvgpu_err(g, "Unmapped engine enum %u",
+                                  engine_enum);
+                        continue;
+                }
+
+                dst_info.engine_instance = src_info->inst_id;
+                dst_info.runlist_id = src_info->runlist_id;
+
+                if (report_index < max_buffer_engines) {
+                        err = copy_to_user(&dst_item_list[report_index],
+                                           &dst_info, sizeof(dst_info));
+                        if (err)
+                                goto clean_up;
+                }
+
+                ++report_index;
+        }
+
+        args->engine_info_buf_size =
+                report_index * sizeof(struct nvgpu_gpu_get_engine_info_item);
+
+clean_up:
+        return err;
+}
+
+static int nvgpu_gpu_alloc_vidmem(struct gk20a *g,
+                        struct nvgpu_gpu_alloc_vidmem_args *args)
+{
+        u32 align = args->in.alignment ? args->in.alignment : SZ_4K;
+        int fd;
+
+        nvgpu_log_fn(g, " ");
+
+        /* not yet supported */
+        if (WARN_ON(args->in.flags & NVGPU_GPU_ALLOC_VIDMEM_FLAG_CPU_MASK))
+                return -EINVAL;
+
+        /* not yet supported */
+        if (WARN_ON(args->in.flags & NVGPU_GPU_ALLOC_VIDMEM_FLAG_VPR))
+                return -EINVAL;
+
+        if (args->in.size & (SZ_4K - 1))
+                return -EINVAL;
+
+        if (!args->in.size)
+                return -EINVAL;
+
+        if (align & (align - 1))
+                return -EINVAL;
+
+        if (align > roundup_pow_of_two(args->in.size)) {
+                /* log this special case, buddy allocator detail */
+                nvgpu_warn(g,
+                        "alignment larger than buffer size rounded up to power of 2 is not supported");
+                return -EINVAL;
+        }
+
+        fd = nvgpu_vidmem_export_linux(g, args->in.size);
+        if (fd < 0)
+                return fd;
+
+        args->out.dmabuf_fd = fd;
+
+        nvgpu_log_fn(g, "done, fd=%d", fd);
+
+        return 0;
+}
+
+static int nvgpu_gpu_get_memory_state(struct gk20a *g,
+                        struct nvgpu_gpu_get_memory_state_args *args)
+{
+        int err;
+
+        nvgpu_log_fn(g, " ");
+
+        if (args->reserved[0] || args->reserved[1] ||
+            args->reserved[2] || args->reserved[3])
+                return -EINVAL;
+
+        err = nvgpu_vidmem_get_space(g, &args->total_free_bytes);
+
+        nvgpu_log_fn(g, "done, err=%d, bytes=%lld", err, args->total_free_bytes);
+
+        return err;
+}
+
+static u32 nvgpu_gpu_convert_clk_domain(u32 clk_domain)
+{
+        u32 domain = 0;
+
+        if (clk_domain == NVGPU_GPU_CLK_DOMAIN_MCLK)
+                domain = NVGPU_CLK_DOMAIN_MCLK;
+        else if (clk_domain == NVGPU_GPU_CLK_DOMAIN_GPCCLK)
+                domain = NVGPU_CLK_DOMAIN_GPCCLK;
+        else
+                domain = NVGPU_CLK_DOMAIN_MAX + 1;
+
+        return domain;
+}
+
+static int nvgpu_gpu_clk_get_vf_points(struct gk20a *g,
+                struct gk20a_ctrl_priv *priv,
+                struct nvgpu_gpu_clk_vf_points_args *args)
+{
+        struct nvgpu_gpu_clk_vf_point clk_point;
+        struct nvgpu_gpu_clk_vf_point __user *entry;
+        struct nvgpu_clk_session *session = priv->clk_session;
+        u32 clk_domains = 0;
+        int err;
+        u16 last_mhz;
+        u16 *fpoints;
+        u32 i;
+        u32 max_points = 0;
+        u32 num_points = 0;
+        u16 min_mhz;
+        u16 max_mhz;
+
+        nvgpu_log_fn(g, " ");
+
+        if (!session || args->flags)
+                return -EINVAL;
+
+        clk_domains = nvgpu_clk_arb_get_arbiter_clk_domains(g);
+        args->num_entries = 0;
+
+        if (!nvgpu_clk_arb_is_valid_domain(g,
+                                nvgpu_gpu_convert_clk_domain(args->clk_domain)))
+                return -EINVAL;
+
+        err = nvgpu_clk_arb_get_arbiter_clk_f_points(g,
+                        nvgpu_gpu_convert_clk_domain(args->clk_domain),
+                        &max_points, NULL);
+        if (err)
+                return err;
+
+        if (!args->max_entries) {
+                args->max_entries = max_points;
+                return 0;
+        }
+
+        if (args->max_entries < max_points)
+                return -EINVAL;
+
+        err = nvgpu_clk_arb_get_arbiter_clk_range(g,
+                        nvgpu_gpu_convert_clk_domain(args->clk_domain),
+                        &min_mhz, &max_mhz);
+        if (err)
+                return err;
+
+        fpoints = nvgpu_kcalloc(g, max_points, sizeof(u16));
+        if (!fpoints)
+                return -ENOMEM;
+
+        err = nvgpu_clk_arb_get_arbiter_clk_f_points(g,
+                        nvgpu_gpu_convert_clk_domain(args->clk_domain),
+                        &max_points, fpoints);
+        if (err)
+                goto fail;
+
+        entry = (struct nvgpu_gpu_clk_vf_point __user *)
+                        (uintptr_t)args->clk_vf_point_entries;
+
+        last_mhz = 0;
+        num_points = 0;
+        for (i = 0; (i < max_points) && !err; i++) {
+
+                /* filter out duplicate frequencies */
+                if (fpoints[i] == last_mhz)
+                        continue;
+
+                /* filter out out-of-range frequencies */
+                if ((fpoints[i] < min_mhz) || (fpoints[i] > max_mhz))
+                        continue;
+
+                last_mhz = fpoints[i];
+                clk_point.freq_hz = MHZ_TO_HZ(fpoints[i]);
+
+                err = copy_to_user((void __user *)entry, &clk_point,
+                                sizeof(clk_point));
+
+                num_points++;
+                entry++;
+        }
+
+        args->num_entries = num_points;
+
+fail:
+        nvgpu_kfree(g, fpoints);
+        return err;
+}
+
+static int nvgpu_gpu_clk_get_range(struct gk20a *g,
+                struct gk20a_ctrl_priv *priv,
+                struct nvgpu_gpu_clk_range_args *args)
+{
+        struct nvgpu_gpu_clk_range clk_range;
+        struct nvgpu_gpu_clk_range __user *entry;
+        struct nvgpu_clk_session *session = priv->clk_session;
+
+        u32 clk_domains = 0;
+        u32 num_domains;
+        u32 num_entries;
+        u32 i;
+        int bit;
+        int err;
+        u16 min_mhz, max_mhz;
+
+        nvgpu_log_fn(g, " ");
+
+        if (!session)
+                return -EINVAL;
+
+        clk_domains = nvgpu_clk_arb_get_arbiter_clk_domains(g);
+        num_domains = hweight_long(clk_domains);
+
+        if (!args->flags) {
+                if (!args->num_entries) {
+                        args->num_entries = num_domains;
+                        return 0;
+                }
+
+                if (args->num_entries < num_domains)
+                        return -EINVAL;
+
+                args->num_entries = 0;
+                num_entries = num_domains;
+
+        } else {
+                if (args->flags != NVGPU_GPU_CLK_FLAG_SPECIFIC_DOMAINS)
+                        return -EINVAL;
+
+                num_entries = args->num_entries;
+                if (num_entries > num_domains)
+                        return -EINVAL;
+        }
+
+        entry = (struct nvgpu_gpu_clk_range __user *)
+                        (uintptr_t)args->clk_range_entries;
+
+        for (i = 0; i < num_entries; i++, entry++) {
+
+                if (args->flags == NVGPU_GPU_CLK_FLAG_SPECIFIC_DOMAINS) {
+                        if (copy_from_user(&clk_range, (void __user *)entry,
+                                        sizeof(clk_range)))
+                                return -EFAULT;
+                } else {
+                        bit = ffs(clk_domains) - 1;
+                        clk_range.clk_domain = bit;
+                        clk_domains &= ~BIT(bit);
+                }
+
+                clk_range.flags = 0;
+                err = nvgpu_clk_arb_get_arbiter_clk_range(g,
+                                nvgpu_gpu_convert_clk_domain(clk_range.clk_domain),
+                                &min_mhz, &max_mhz);
+                clk_range.min_hz = MHZ_TO_HZ(min_mhz);
+                clk_range.max_hz = MHZ_TO_HZ(max_mhz);
+
+                if (err)
+                        return err;
+
+                err = copy_to_user(entry, &clk_range, sizeof(clk_range));
+                if (err)
+                        return -EFAULT;
+        }
+
+        args->num_entries = num_entries;
+
+        return 0;
+}
+
+static int nvgpu_gpu_clk_set_info(struct gk20a *g,
+                struct gk20a_ctrl_priv *priv,
+                struct nvgpu_gpu_clk_set_info_args *args)
+{
+        struct nvgpu_gpu_clk_info clk_info;
+        struct nvgpu_gpu_clk_info __user *entry;
+        struct nvgpu_clk_session *session = priv->clk_session;
+
+        int fd;
+        u32 clk_domains = 0;
+        u16 freq_mhz;
+        int i;
+        int ret;
+
+        nvgpu_log_fn(g, " ");
+
+        if (!session || args->flags)
+                return -EINVAL;
+
+        clk_domains = nvgpu_clk_arb_get_arbiter_clk_domains(g);
+        if (!clk_domains)
+                return -EINVAL;
+
+        entry = (struct nvgpu_gpu_clk_info __user *)
+                        (uintptr_t)args->clk_info_entries;
+
+        for (i = 0; i < args->num_entries; i++, entry++) {
+
+                if (copy_from_user(&clk_info, entry, sizeof(clk_info)))
+                        return -EFAULT;
+
+                if (!nvgpu_clk_arb_is_valid_domain(g,
+                                        nvgpu_gpu_convert_clk_domain(clk_info.clk_domain)))
+                        return -EINVAL;
+        }
+        nvgpu_speculation_barrier();
+
+        entry = (struct nvgpu_gpu_clk_info __user *)
+                        (uintptr_t)args->clk_info_entries;
+
+        ret = nvgpu_clk_arb_install_request_fd(g, session, &fd);
+        if (ret < 0)
+                return ret;
+
+        for (i = 0; i < args->num_entries; i++, entry++) {
+
+                if (copy_from_user(&clk_info, (void __user *)entry,
+                                sizeof(clk_info)))
+                        return -EFAULT;
+                freq_mhz = HZ_TO_MHZ(clk_info.freq_hz);
+
+                nvgpu_clk_arb_set_session_target_mhz(session, fd,
+                                nvgpu_gpu_convert_clk_domain(clk_info.clk_domain), freq_mhz);
+        }
+
+        nvgpu_speculation_barrier();
+        ret = nvgpu_clk_arb_commit_request_fd(g, session, fd);
+        if (ret < 0)
+                return ret;
+
+        args->completion_fd = fd;
+
+        return ret;
+}
+
+static int nvgpu_gpu_clk_get_info(struct gk20a *g,
+                struct gk20a_ctrl_priv *priv,
+                struct nvgpu_gpu_clk_get_info_args *args)
+{
+        struct nvgpu_gpu_clk_info clk_info;
+        struct nvgpu_gpu_clk_info __user *entry;
+        struct nvgpu_clk_session *session = priv->clk_session;
+        u32 clk_domains = 0;
+        u32 num_domains;
+        u32 num_entries;
+        u32 i;
+        u16 freq_mhz;
+        int err;
+        int bit;
+
+        nvgpu_log_fn(g, " ");
+
+        if (!session)
+                return -EINVAL;
+
+        clk_domains = nvgpu_clk_arb_get_arbiter_clk_domains(g);
+        num_domains = hweight_long(clk_domains);
+
+        if (!args->flags) {
+                if (!args->num_entries) {
+                        args->num_entries = num_domains;
+                        return 0;
+                }
+
+                if (args->num_entries < num_domains)
+                        return -EINVAL;
+
+                args->num_entries = 0;
+                num_entries = num_domains;
+
+        } else {
+                if (args->flags != NVGPU_GPU_CLK_FLAG_SPECIFIC_DOMAINS)
+                        return -EINVAL;
+
+                num_entries = args->num_entries;
+                if (num_entries > num_domains * 3)
+                        return -EINVAL;
+        }
+
+        entry = (struct nvgpu_gpu_clk_info __user *)
+                        (uintptr_t)args->clk_info_entries;
+
+        for (i = 0; i < num_entries; i++, entry++) {
+
+                if (args->flags == NVGPU_GPU_CLK_FLAG_SPECIFIC_DOMAINS) {
+                        if (copy_from_user(&clk_info, (void __user *)entry,
+                                        sizeof(clk_info)))
+                                return -EFAULT;
+                } else {
+                        bit = ffs(clk_domains) - 1;
+                        clk_info.clk_domain = bit;
+                        clk_domains &= ~BIT(bit);
+                        clk_info.clk_type = args->clk_type;
+                }
+
+                nvgpu_speculation_barrier();
+                switch (clk_info.clk_type) {
+                case NVGPU_GPU_CLK_TYPE_TARGET:
+                        err = nvgpu_clk_arb_get_session_target_mhz(session,
+                                        nvgpu_gpu_convert_clk_domain(clk_info.clk_domain),
+                                        &freq_mhz);
+                        break;
+                case NVGPU_GPU_CLK_TYPE_ACTUAL:
+                        err = nvgpu_clk_arb_get_arbiter_actual_mhz(g,
+                                        nvgpu_gpu_convert_clk_domain(clk_info.clk_domain),
+                                        &freq_mhz);
+                        break;
+                case NVGPU_GPU_CLK_TYPE_EFFECTIVE:
+                        err = nvgpu_clk_arb_get_arbiter_effective_mhz(g,
+                                        nvgpu_gpu_convert_clk_domain(clk_info.clk_domain),
+                                        &freq_mhz);
+                        break;
+                default:
+                        freq_mhz = 0;
+                        err = -EINVAL;
+                        break;
+                }
+                if (err)
+                        return err;
+
+                clk_info.flags = 0;
+                clk_info.freq_hz = MHZ_TO_HZ(freq_mhz);
+
+                err = copy_to_user((void __user *)entry, &clk_info,
+                                sizeof(clk_info));
+                if (err)
+                        return -EFAULT;
+        }
+
+        nvgpu_speculation_barrier();
+        args->num_entries = num_entries;
+
+        return 0;
+}
+
+static int nvgpu_gpu_get_event_fd(struct gk20a *g,
+        struct gk20a_ctrl_priv *priv,
+        struct nvgpu_gpu_get_event_fd_args *args)
+{
+        struct nvgpu_clk_session *session = priv->clk_session;
+
+        nvgpu_log_fn(g, " ");
+
+        if (!session)
+                return -EINVAL;
+
+        return nvgpu_clk_arb_install_event_fd(g, session, &args->event_fd,
+                args->flags);
+}
+
+static int nvgpu_gpu_get_voltage(struct gk20a *g,
+                struct nvgpu_gpu_get_voltage_args *args)
+{
+        int err = -EINVAL;
+
+        nvgpu_log_fn(g, " ");
+
+        if (args->reserved)
+                return -EINVAL;
+
+        if (!nvgpu_is_enabled(g, NVGPU_SUPPORT_GET_VOLTAGE))
+                return -EINVAL;
+
+        err = gk20a_busy(g);
+        if (err)
+            return err;
+
+        nvgpu_speculation_barrier();
+        switch (args->which) {
+        case NVGPU_GPU_VOLTAGE_CORE:
+                err = volt_get_voltage(g, CTRL_VOLT_DOMAIN_LOGIC, &args->voltage);
+                break;
+        case NVGPU_GPU_VOLTAGE_SRAM:
+                err = volt_get_voltage(g, CTRL_VOLT_DOMAIN_SRAM, &args->voltage);
+                break;
+        case NVGPU_GPU_VOLTAGE_BUS:
+                err = pmgr_pwr_devices_get_voltage(g, &args->voltage);
+                break;
+        default:
+                err = -EINVAL;
+        }
+
+        gk20a_idle(g);
+
+        return err;
+}
+
+static int nvgpu_gpu_get_current(struct gk20a *g,
+                struct nvgpu_gpu_get_current_args *args)
+{
+        int err;
+
+        nvgpu_log_fn(g, " ");
+
+        if (args->reserved[0] || args->reserved[1] || args->reserved[2])
+                return -EINVAL;
+
+        if (!nvgpu_is_enabled(g, NVGPU_SUPPORT_GET_CURRENT))
+                return -EINVAL;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        err = pmgr_pwr_devices_get_current(g, &args->currnt);
+
+        gk20a_idle(g);
+
+        return err;
+}
+
+static int nvgpu_gpu_get_power(struct gk20a *g,
+                struct nvgpu_gpu_get_power_args *args)
+{
+        int err;
+
+        nvgpu_log_fn(g, " ");
+
+        if (args->reserved[0] || args->reserved[1] || args->reserved[2])
+                return -EINVAL;
+
+        if (!nvgpu_is_enabled(g, NVGPU_SUPPORT_GET_POWER))
+                return -EINVAL;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        err = pmgr_pwr_devices_get_power(g, &args->power);
+
+        gk20a_idle(g);
+
+        return err;
+}
+
+static int nvgpu_gpu_get_temperature(struct gk20a *g,
+                struct nvgpu_gpu_get_temperature_args *args)
+{
+        int err;
+        u32 temp_f24_8;
+
+        nvgpu_log_fn(g, " ");
+
+        if (args->reserved[0] || args->reserved[1] || args->reserved[2])
+                return -EINVAL;
+
+        if (!nvgpu_is_enabled(g, NVGPU_SUPPORT_GET_TEMPERATURE))
+                return -EINVAL;
+
+        if (!g->ops.therm.get_internal_sensor_curr_temp)
+                return -EINVAL;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        err = g->ops.therm.get_internal_sensor_curr_temp(g, &temp_f24_8);
+
+        gk20a_idle(g);
+
+        args->temp_f24_8 = (s32)temp_f24_8;
+
+        return err;
+}
+
+static int nvgpu_gpu_set_therm_alert_limit(struct gk20a *g,
+                struct nvgpu_gpu_set_therm_alert_limit_args *args)
+{
+        int err;
+
+        nvgpu_log_fn(g, " ");
+
+        if (args->reserved[0] || args->reserved[1] || args->reserved[2])
+                return -EINVAL;
+
+        if (!g->ops.therm.configure_therm_alert)
+                return -EINVAL;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        err = g->ops.therm.configure_therm_alert(g, args->temp_f24_8);
+
+        gk20a_idle(g);
+
+        return err;
+}
+
+static int nvgpu_gpu_set_deterministic_ch_railgate(struct channel_gk20a *ch,
+                u32 flags)
+{
+        int err = 0;
+        bool allow;
+        bool disallow;
+
+        allow = flags &
+                NVGPU_GPU_SET_DETERMINISTIC_OPTS_FLAGS_ALLOW_RAILGATING;
+
+        disallow = flags &
+                NVGPU_GPU_SET_DETERMINISTIC_OPTS_FLAGS_DISALLOW_RAILGATING;
+
+        /* Can't be both at the same time */
+        if (allow && disallow)
+                return -EINVAL;
+
+        /* Nothing to do */
+        if (!allow && !disallow)
+                return 0;
+
+        /*
+         * Moving into explicit idle or back from it? A call that doesn't
+         * change the status is a no-op.
+         */
+        if (!ch->deterministic_railgate_allowed &&
+                        allow) {
+                gk20a_idle(ch->g);
+        } else if (ch->deterministic_railgate_allowed &&
+                        !allow) {
+                err = gk20a_busy(ch->g);
+                if (err) {
+                        nvgpu_warn(ch->g,
+                                "cannot busy to restore deterministic ch");
+                        return err;
+                }
+        }
+        ch->deterministic_railgate_allowed = allow;
+
+        return err;
+}
+
+static int nvgpu_gpu_set_deterministic_ch(struct channel_gk20a *ch, u32 flags)
+{
+        if (!ch->deterministic)
+                return -EINVAL;
+
+        return nvgpu_gpu_set_deterministic_ch_railgate(ch, flags);
+}
+
+static int nvgpu_gpu_set_deterministic_opts(struct gk20a *g,
+                struct nvgpu_gpu_set_deterministic_opts_args *args)
+{
+        int __user *user_channels;
+        u32 i = 0;
+        int err = 0;
+
+        nvgpu_log_fn(g, " ");
+
+        user_channels = (int __user *)(uintptr_t)args->channels;
+
+        /* Upper limit; prevent holding deterministic_busy for long */
+        if (args->num_channels > g->fifo.num_channels) {
+                err = -EINVAL;
+                goto out;
+        }
+
+        /* Trivial sanity check first */
+        if (!access_ok(VERIFY_READ, user_channels,
+                                args->num_channels * sizeof(int))) {
+                err = -EFAULT;
+                goto out;
+        }
+
+        nvgpu_rwsem_down_read(&g->deterministic_busy);
+
+        /* note: we exit at the first failure */
+        for (; i < args->num_channels; i++) {
+                int ch_fd = 0;
+                struct channel_gk20a *ch;
+
+                if (copy_from_user(&ch_fd, &user_channels[i], sizeof(int))) {
+                        /* User raced with above access_ok */
+                        err = -EFAULT;
+                        break;
+                }
+
+                ch = gk20a_get_channel_from_file(ch_fd);
+                if (!ch) {
+                        err = -EINVAL;
+                        break;
+                }
+
+                err = nvgpu_gpu_set_deterministic_ch(ch, args->flags);
+
+                gk20a_channel_put(ch);
+
+                if (err)
+                        break;
+        }
+
+        nvgpu_speculation_barrier();
+        nvgpu_rwsem_up_read(&g->deterministic_busy);
+
+out:
+        args->num_channels = i;
+        return err;
+}
+
+long gk20a_ctrl_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+        struct gk20a_ctrl_priv *priv = filp->private_data;
+        struct gk20a *g = priv->g;
+        struct nvgpu_gpu_zcull_get_ctx_size_args *get_ctx_size_args;
+        struct nvgpu_gpu_zcull_get_info_args *get_info_args;
+        struct nvgpu_gpu_zbc_set_table_args *set_table_args;
+        struct nvgpu_gpu_zbc_query_table_args *query_table_args;
+        u8 buf[NVGPU_GPU_IOCTL_MAX_ARG_SIZE];
+        struct gr_zcull_info *zcull_info;
+        struct zbc_entry *zbc_val;
+        struct zbc_query_params *zbc_tbl;
+        int i, err = 0;
+
+        nvgpu_log_fn(g, "start %d", _IOC_NR(cmd));
+
+        if ((_IOC_TYPE(cmd) != NVGPU_GPU_IOCTL_MAGIC) ||
+                (_IOC_NR(cmd) == 0) ||
+                (_IOC_NR(cmd) > NVGPU_GPU_IOCTL_LAST) ||
+                (_IOC_SIZE(cmd) > NVGPU_GPU_IOCTL_MAX_ARG_SIZE))
+                return -EINVAL;
+
+        memset(buf, 0, sizeof(buf));
+        if (_IOC_DIR(cmd) & _IOC_WRITE) {
+                if (copy_from_user(buf, (void __user *)arg, _IOC_SIZE(cmd)))
+                        return -EFAULT;
+        }
+
+        if (!g->sw_ready) {
+                err = gk20a_busy(g);
+                if (err)
+                        return err;
+
+                gk20a_idle(g);
+        }
+
+        nvgpu_speculation_barrier();
+        switch (cmd) {
+        case NVGPU_GPU_IOCTL_ZCULL_GET_CTX_SIZE:
+                get_ctx_size_args = (struct nvgpu_gpu_zcull_get_ctx_size_args *)buf;
+
+                get_ctx_size_args->size = gr_gk20a_get_ctxsw_zcull_size(g, &g->gr);
+
+                break;
+        case NVGPU_GPU_IOCTL_ZCULL_GET_INFO:
+                get_info_args = (struct nvgpu_gpu_zcull_get_info_args *)buf;
+
+                memset(get_info_args, 0, sizeof(struct nvgpu_gpu_zcull_get_info_args));
+
+                zcull_info = nvgpu_kzalloc(g, sizeof(struct gr_zcull_info));
+                if (zcull_info == NULL)
+                        return -ENOMEM;
+
+                err = g->ops.gr.get_zcull_info(g, &g->gr, zcull_info);
+                if (err) {
+                        nvgpu_kfree(g, zcull_info);
+                        break;
+                }
+
+                get_info_args->width_align_pixels = zcull_info->width_align_pixels;
+                get_info_args->height_align_pixels = zcull_info->height_align_pixels;
+                get_info_args->pixel_squares_by_aliquots = zcull_info->pixel_squares_by_aliquots;
+                get_info_args->aliquot_total = zcull_info->aliquot_total;
+                get_info_args->region_byte_multiplier = zcull_info->region_byte_multiplier;
+                get_info_args->region_header_size = zcull_info->region_header_size;
+                get_info_args->subregion_header_size = zcull_info->subregion_header_size;
+                get_info_args->subregion_width_align_pixels = zcull_info->subregion_width_align_pixels;
+                get_info_args->subregion_height_align_pixels = zcull_info->subregion_height_align_pixels;
+                get_info_args->subregion_count = zcull_info->subregion_count;
+
+                nvgpu_kfree(g, zcull_info);
+                break;
+        case NVGPU_GPU_IOCTL_ZBC_SET_TABLE:
+                set_table_args = (struct nvgpu_gpu_zbc_set_table_args *)buf;
+
+                zbc_val = nvgpu_kzalloc(g, sizeof(struct zbc_entry));
+                if (zbc_val == NULL)
+                        return -ENOMEM;
+
+                zbc_val->format = set_table_args->format;
+                zbc_val->type = set_table_args->type;
+
+                nvgpu_speculation_barrier();
+                switch (zbc_val->type) {
+                case GK20A_ZBC_TYPE_COLOR:
+                        for (i = 0; i < GK20A_ZBC_COLOR_VALUE_SIZE; i++) {
+                                zbc_val->color_ds[i] = set_table_args->color_ds[i];
+                                zbc_val->color_l2[i] = set_table_args->color_l2[i];
+                        }
+                        break;
+                case GK20A_ZBC_TYPE_DEPTH:
+                case T19X_ZBC:
+                        zbc_val->depth = set_table_args->depth;
+                        break;
+                default:
+                        err = -EINVAL;
+                }
+
+                if (!err) {
+                        err = gk20a_busy(g);
+                        if (!err) {
+                                err = g->ops.gr.zbc_set_table(g, &g->gr,
+                                                             zbc_val);
+                                gk20a_idle(g);
+                        }
+                }
+
+                if (zbc_val)
+                        nvgpu_kfree(g, zbc_val);
+                break;
+        case NVGPU_GPU_IOCTL_ZBC_QUERY_TABLE:
+                query_table_args = (struct nvgpu_gpu_zbc_query_table_args *)buf;
+
+                zbc_tbl = nvgpu_kzalloc(g, sizeof(struct zbc_query_params));
+                if (zbc_tbl == NULL)
+                        return -ENOMEM;
+
+                zbc_tbl->type = query_table_args->type;
+                zbc_tbl->index_size = query_table_args->index_size;
+
+                err = g->ops.gr.zbc_query_table(g, &g->gr, zbc_tbl);
+
+                if (!err) {
+                        switch (zbc_tbl->type) {
+                        case GK20A_ZBC_TYPE_COLOR:
+                                for (i = 0; i < GK20A_ZBC_COLOR_VALUE_SIZE; i++) {
+                                        query_table_args->color_ds[i] = zbc_tbl->color_ds[i];
+                                        query_table_args->color_l2[i] = zbc_tbl->color_l2[i];
+                                }
+                                break;
+                        case GK20A_ZBC_TYPE_DEPTH:
+                        case T19X_ZBC:
+                                query_table_args->depth = zbc_tbl->depth;
+                                break;
+                        case GK20A_ZBC_TYPE_INVALID:
+                                query_table_args->index_size = zbc_tbl->index_size;
+                                break;
+                        default:
+                                err = -EINVAL;
+                        }
+                        if (!err) {
+                                query_table_args->format = zbc_tbl->format;
+                                query_table_args->ref_cnt = zbc_tbl->ref_cnt;
+                        }
+                }
+
+                if (zbc_tbl)
+                        nvgpu_kfree(g, zbc_tbl);
+                break;
+
+        case NVGPU_GPU_IOCTL_GET_CHARACTERISTICS:
+                err = gk20a_ctrl_ioctl_gpu_characteristics(
+                        g, (struct nvgpu_gpu_get_characteristics *)buf);
+                break;
+        case NVGPU_GPU_IOCTL_PREPARE_COMPRESSIBLE_READ:
+                err = gk20a_ctrl_prepare_compressible_read(g,
+                        (struct nvgpu_gpu_prepare_compressible_read_args *)buf);
+                break;
+        case NVGPU_GPU_IOCTL_MARK_COMPRESSIBLE_WRITE:
+                err = gk20a_ctrl_mark_compressible_write(g,
+                        (struct nvgpu_gpu_mark_compressible_write_args *)buf);
+                break;
+        case NVGPU_GPU_IOCTL_ALLOC_AS:
+                err = gk20a_ctrl_alloc_as(g,
+                        (struct nvgpu_alloc_as_args *)buf);
+                break;
+        case NVGPU_GPU_IOCTL_OPEN_TSG:
+                err = gk20a_ctrl_open_tsg(g,
+                        (struct nvgpu_gpu_open_tsg_args *)buf);
+                break;
+        case NVGPU_GPU_IOCTL_GET_TPC_MASKS:
+                err = gk20a_ctrl_get_tpc_masks(g,
+                        (struct nvgpu_gpu_get_tpc_masks_args *)buf);
+                break;
+        case NVGPU_GPU_IOCTL_GET_FBP_L2_MASKS:
+                err = gk20a_ctrl_get_fbp_l2_masks(g,
+                        (struct nvgpu_gpu_get_fbp_l2_masks_args *)buf);
+                break;
+        case NVGPU_GPU_IOCTL_OPEN_CHANNEL:
+                /* this arg type here, but ..gpu_open_channel_args in nvgpu.h
+                 * for consistency - they are the same */
+                err = gk20a_channel_open_ioctl(g,
+                        (struct nvgpu_channel_open_args *)buf);
+                break;
+        case NVGPU_GPU_IOCTL_FLUSH_L2:
+                err = nvgpu_gpu_ioctl_l2_fb_ops(g,
+                           (struct nvgpu_gpu_l2_fb_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_SET_MMUDEBUG_MODE:
+                err =  nvgpu_gpu_ioctl_set_mmu_debug_mode(g,
+                                (struct nvgpu_gpu_mmu_debug_mode_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_SET_SM_DEBUG_MODE:
+                err = gr_gk20a_elpg_protected_call(g,
+                                nvgpu_gpu_ioctl_set_debug_mode(g, (struct nvgpu_gpu_sm_debug_mode_args *)buf));
+                break;
+
+        case NVGPU_GPU_IOCTL_TRIGGER_SUSPEND:
+                err = nvgpu_gpu_ioctl_trigger_suspend(g);
+                break;
+
+        case NVGPU_GPU_IOCTL_WAIT_FOR_PAUSE:
+                err = nvgpu_gpu_ioctl_wait_for_pause(g,
+                                (struct nvgpu_gpu_wait_pause_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_RESUME_FROM_PAUSE:
+                err = nvgpu_gpu_ioctl_resume_from_pause(g);
+                break;
+
+        case NVGPU_GPU_IOCTL_CLEAR_SM_ERRORS:
+                err = nvgpu_gpu_ioctl_clear_sm_errors(g);
+                break;
+
+        case NVGPU_GPU_IOCTL_GET_TPC_EXCEPTION_EN_STATUS:
+                err =  nvgpu_gpu_ioctl_has_any_exception(g,
+                                (struct nvgpu_gpu_tpc_exception_en_status_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_NUM_VSMS:
+                err = gk20a_ctrl_get_num_vsms(g,
+                        (struct nvgpu_gpu_num_vsms *)buf);
+                break;
+        case NVGPU_GPU_IOCTL_VSMS_MAPPING:
+                err = gk20a_ctrl_vsm_mapping(g,
+                        (struct nvgpu_gpu_vsms_mapping *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_GET_CPU_TIME_CORRELATION_INFO:
+                err = nvgpu_gpu_get_cpu_time_correlation_info(g,
+                        (struct nvgpu_gpu_get_cpu_time_correlation_info_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_GET_GPU_TIME:
+                err = nvgpu_gpu_get_gpu_time(g,
+                        (struct nvgpu_gpu_get_gpu_time_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_GET_ENGINE_INFO:
+                err = nvgpu_gpu_get_engine_info(g,
+                        (struct nvgpu_gpu_get_engine_info_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_ALLOC_VIDMEM:
+                err = nvgpu_gpu_alloc_vidmem(g,
+                        (struct nvgpu_gpu_alloc_vidmem_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_GET_MEMORY_STATE:
+                err = nvgpu_gpu_get_memory_state(g,
+                        (struct nvgpu_gpu_get_memory_state_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_CLK_GET_RANGE:
+                err = nvgpu_gpu_clk_get_range(g, priv,
+                        (struct nvgpu_gpu_clk_range_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_CLK_GET_VF_POINTS:
+                err = nvgpu_gpu_clk_get_vf_points(g, priv,
+                        (struct nvgpu_gpu_clk_vf_points_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_CLK_SET_INFO:
+                err = nvgpu_gpu_clk_set_info(g, priv,
+                        (struct nvgpu_gpu_clk_set_info_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_CLK_GET_INFO:
+                err = nvgpu_gpu_clk_get_info(g, priv,
+                        (struct nvgpu_gpu_clk_get_info_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_GET_EVENT_FD:
+                err = nvgpu_gpu_get_event_fd(g, priv,
+                        (struct nvgpu_gpu_get_event_fd_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_GET_VOLTAGE:
+                err = nvgpu_gpu_get_voltage(g,
+                        (struct nvgpu_gpu_get_voltage_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_GET_CURRENT:
+                err = nvgpu_gpu_get_current(g,
+                        (struct nvgpu_gpu_get_current_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_GET_POWER:
+                err = nvgpu_gpu_get_power(g,
+                        (struct nvgpu_gpu_get_power_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_GET_TEMPERATURE:
+                err = nvgpu_gpu_get_temperature(g,
+                        (struct nvgpu_gpu_get_temperature_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_SET_THERM_ALERT_LIMIT:
+                err = nvgpu_gpu_set_therm_alert_limit(g,
+                        (struct nvgpu_gpu_set_therm_alert_limit_args *)buf);
+                break;
+
+        case NVGPU_GPU_IOCTL_SET_DETERMINISTIC_OPTS:
+                err = nvgpu_gpu_set_deterministic_opts(g,
+                        (struct nvgpu_gpu_set_deterministic_opts_args *)buf);
+                break;
+
+        default:
+                nvgpu_log_info(g, "unrecognized gpu ioctl cmd: 0x%x", cmd);
+                err = -ENOTTY;
+                break;
+        }
+
+        if ((err == 0) && (_IOC_DIR(cmd) & _IOC_READ))
+                err = copy_to_user((void __user *)arg, buf, _IOC_SIZE(cmd));
+
+        return err;
+}
+
+static void usermode_vma_close(struct vm_area_struct *vma)
+{
+        struct gk20a_ctrl_priv *priv = vma->vm_private_data;
+        struct gk20a *g = priv->g;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        nvgpu_mutex_acquire(&l->ctrl.privs_lock);
+        priv->usermode_vma.vma = NULL;
+        priv->usermode_vma.vma_mapped = false;
+        nvgpu_mutex_release(&l->ctrl.privs_lock);
+}
+
+struct vm_operations_struct usermode_vma_ops = {
+        /* no .open - we use VM_DONTCOPY and don't support fork */
+        .close = usermode_vma_close,
+};
+
+int gk20a_ctrl_dev_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+        struct gk20a_ctrl_priv *priv = filp->private_data;
+        struct gk20a *g = priv->g;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        u64 addr;
+        int err;
+
+        if (g->ops.fifo.usermode_base == NULL)
+                return -ENOSYS;
+
+        if (priv->usermode_vma.vma != NULL)
+                return -EBUSY;
+
+        if (vma->vm_end - vma->vm_start != SZ_4K)
+                return -EINVAL;
+
+        if (vma->vm_pgoff != 0UL)
+                return -EINVAL;
+
+        addr = l->regs_bus_addr + g->ops.fifo.usermode_base(g);
+
+        /* Sync with poweron/poweroff, and require valid regs */
+        err = gk20a_busy(g);
+        if (err) {
+                return err;
+        }
+
+        nvgpu_mutex_acquire(&l->ctrl.privs_lock);
+
+        vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE |
+                VM_DONTDUMP | VM_PFNMAP;
+        vma->vm_ops = &usermode_vma_ops;
+        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+        err = io_remap_pfn_range(vma, vma->vm_start, addr >> PAGE_SHIFT,
+                        vma->vm_end - vma->vm_start, vma->vm_page_prot);
+        if (!err) {
+                priv->usermode_vma.vma = vma;
+                priv->usermode_vma.flags = vma->vm_flags;
+                vma->vm_private_data = priv;
+                priv->usermode_vma.vma_mapped = true;
+        }
+        nvgpu_mutex_release(&l->ctrl.privs_lock);
+
+        gk20a_idle(g);
+
+        return err;
+}
+
+static void alter_usermode_mapping(struct gk20a *g,
+                struct gk20a_ctrl_priv *priv,
+                bool poweroff)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct vm_area_struct *vma = priv->usermode_vma.vma;
+        bool vma_mapped = priv->usermode_vma.vma_mapped;
+        u64 addr;
+        int err;
+
+        if (!vma) {
+                /* Nothing to do - no mmap called */
+                return;
+        }
+
+        addr = l->regs_bus_addr + g->ops.fifo.usermode_base(g);
+
+        down_write(&vma->vm_mm->mmap_sem);
+
+        /*
+         * This is a no-op for the below cases
+         * a) poweroff and !vma_mapped - > do nothing as no map exists
+         * b) !poweroff and vmap_mapped -> do nothing as already mapped
+         */
+        if (poweroff && vma_mapped) {
+                err = zap_vma_ptes(vma, vma->vm_start, SZ_4K);
+                if (err == 0) {
+                        vma->vm_flags = VM_NONE;
+                        priv->usermode_vma.vma_mapped = false;
+                } else {
+                        nvgpu_err(g, "can't remove usermode mapping");
+                }
+        } else if (!poweroff && !vma_mapped) {
+                vma->vm_flags = priv->usermode_vma.flags;
+                err = io_remap_pfn_range(vma, vma->vm_start,
+                                addr >> PAGE_SHIFT,
+                                SZ_4K, vma->vm_page_prot);
+                if (err != 0) {
+                        nvgpu_err(g, "can't restore usermode mapping");
+                        vma->vm_flags = VM_NONE;
+                } else {
+                        priv->usermode_vma.vma_mapped = true;
+                }
+        }
+
+        up_write(&vma->vm_mm->mmap_sem);
+}
+
+static void alter_usermode_mappings(struct gk20a *g, bool poweroff)
+{
+        struct gk20a_ctrl_priv *priv;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        nvgpu_mutex_acquire(&l->ctrl.privs_lock);
+        nvgpu_list_for_each_entry(priv, &l->ctrl.privs,
+                        gk20a_ctrl_priv, list) {
+                alter_usermode_mapping(g, priv, poweroff);
+        }
+        nvgpu_mutex_release(&l->ctrl.privs_lock);
+}
+
+void nvgpu_hide_usermode_for_poweroff(struct gk20a *g)
+{
+        alter_usermode_mappings(g, true);
+}
+
+void nvgpu_restore_usermode_for_poweron(struct gk20a *g)
+{
+        alter_usermode_mappings(g, false);
+}
diff --git a/include/os/linux/ioctl_ctrl.h b/include/os/linux/ioctl_ctrl.h
new file mode 100644
index 0000000..3e1f798
--- /dev/null
+++ b/include/os/linux/ioctl_ctrl.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2011-2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __NVGPU_IOCTL_CTRL_H__
+#define __NVGPU_IOCTL_CTRL_H__
+
+int gk20a_ctrl_dev_open(struct inode *inode, struct file *filp);
+int gk20a_ctrl_dev_release(struct inode *inode, struct file *filp);
+long gk20a_ctrl_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+int gk20a_ctrl_dev_mmap(struct file *filp, struct vm_area_struct *vma);
+
+void nvgpu_hide_usermode_for_poweroff(struct gk20a *g);
+void nvgpu_restore_usermode_for_poweron(struct gk20a *g);
+
+#endif
diff --git a/include/os/linux/ioctl_dbg.c b/include/os/linux/ioctl_dbg.c
new file mode 100644
index 0000000..b5a1071
--- /dev/null
+++ b/include/os/linux/ioctl_dbg.c
@@ -0,0 +1,2210 @@
+/*
+ * Tegra GK20A GPU Debugger/Profiler Driver
+ *
+ * Copyright (c) 2017-2020, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/cdev.h>
+#include <linux/uaccess.h>
+#include <linux/dma-buf.h>
+#include <linux/poll.h>
+#include <uapi/linux/nvgpu.h>
+
+#include <nvgpu/kmem.h>
+#include <nvgpu/log.h>
+#include <nvgpu/vm.h>
+#include <nvgpu/atomic.h>
+#include <nvgpu/cond.h>
+#include <nvgpu/utils.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/channel.h>
+#include <nvgpu/tsg.h>
+
+#include <nvgpu/linux/vm.h>
+
+#include "gk20a/gr_gk20a.h"
+#include "gk20a/regops_gk20a.h"
+#include "gk20a/dbg_gpu_gk20a.h"
+#include "os_linux.h"
+#include "platform_gk20a.h"
+#include "ioctl_dbg.h"
+#include "ioctl_channel.h"
+#include "dmabuf_vidmem.h"
+
+struct dbg_session_gk20a_linux {
+        struct device   *dev;
+        struct dbg_session_gk20a dbg_s;
+};
+
+struct dbg_session_channel_data_linux {
+        /*
+         * We have to keep a ref to the _file_, not the channel, because
+         * close(channel_fd) is synchronous and would deadlock if we had an
+         * open debug session fd holding a channel ref at that time. Holding a
+         * ref to the file makes close(channel_fd) just drop a kernel ref to
+         * the file; the channel will close when the last file ref is dropped.
+         */
+        struct file *ch_f;
+        struct dbg_session_channel_data ch_data;
+};
+/* turn seriously unwieldy names -> something shorter */
+#define REGOP_LINUX(x) NVGPU_DBG_GPU_REG_OP_##x
+
+/* silly allocator - just increment id */
+static nvgpu_atomic_t unique_id = NVGPU_ATOMIC_INIT(0);
+static int generate_unique_id(void)
+{
+        return nvgpu_atomic_add_return(1, &unique_id);
+}
+
+static int alloc_profiler(struct gk20a *g,
+                          struct dbg_profiler_object_data **_prof)
+{
+        struct dbg_profiler_object_data *prof;
+        *_prof = NULL;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_gpu_dbg, " ");
+
+        prof = nvgpu_kzalloc(g, sizeof(*prof));
+        if (!prof)
+                return -ENOMEM;
+
+        prof->prof_handle = generate_unique_id();
+        *_prof = prof;
+        return 0;
+}
+
+static int alloc_session(struct gk20a *g, struct dbg_session_gk20a_linux **_dbg_s_linux)
+{
+        struct dbg_session_gk20a_linux *dbg_s_linux;
+        *_dbg_s_linux = NULL;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_gpu_dbg, " ");
+
+        dbg_s_linux = nvgpu_kzalloc(g, sizeof(*dbg_s_linux));
+        if (!dbg_s_linux)
+                return -ENOMEM;
+
+        dbg_s_linux->dbg_s.id = generate_unique_id();
+        *_dbg_s_linux = dbg_s_linux;
+        return 0;
+}
+
+static int gk20a_perfbuf_release_locked(struct gk20a *g, u64 offset);
+
+static int nvgpu_ioctl_channel_reg_ops(struct dbg_session_gk20a *dbg_s,
+                                struct nvgpu_dbg_gpu_exec_reg_ops_args *args);
+
+static int nvgpu_ioctl_powergate_gk20a(struct dbg_session_gk20a *dbg_s,
+                                struct nvgpu_dbg_gpu_powergate_args *args);
+
+static int nvgpu_dbg_gpu_ioctl_smpc_ctxsw_mode(struct dbg_session_gk20a *dbg_s,
+                              struct nvgpu_dbg_gpu_smpc_ctxsw_mode_args *args);
+
+static int nvgpu_dbg_gpu_ioctl_hwpm_ctxsw_mode(struct dbg_session_gk20a *dbg_s,
+                              struct nvgpu_dbg_gpu_hwpm_ctxsw_mode_args *args);
+
+static int nvgpu_dbg_gpu_ioctl_set_mmu_debug_mode(
+                struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_set_ctx_mmu_debug_mode_args *args);
+
+static int nvgpu_dbg_gpu_ioctl_suspend_resume_sm(
+                struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_suspend_resume_all_sms_args *args);
+
+static int nvgpu_ioctl_allocate_profiler_object(struct dbg_session_gk20a_linux *dbg_s,
+                                struct nvgpu_dbg_gpu_profiler_obj_mgt_args *args);
+
+static int nvgpu_ioctl_free_profiler_object(struct dbg_session_gk20a_linux *dbg_s_linux,
+                                struct nvgpu_dbg_gpu_profiler_obj_mgt_args *args);
+
+static int nvgpu_ioctl_profiler_reserve(struct dbg_session_gk20a *dbg_s,
+                           struct nvgpu_dbg_gpu_profiler_reserve_args *args);
+
+static int gk20a_perfbuf_map(struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_perfbuf_map_args *args);
+
+static int gk20a_perfbuf_unmap(struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_perfbuf_unmap_args *args);
+
+static int nvgpu_dbg_timeout_enable(struct dbg_session_gk20a *dbg_s,
+                          int timeout_mode);
+
+static int nvgpu_profiler_reserve_acquire(struct dbg_session_gk20a *dbg_s,
+                                                                u32 profiler_handle);
+
+static void gk20a_dbg_session_nvgpu_mutex_acquire(struct dbg_session_gk20a *dbg_s);
+
+static void gk20a_dbg_session_nvgpu_mutex_release(struct dbg_session_gk20a *dbg_s);
+
+static int nvgpu_profiler_reserve_release(struct dbg_session_gk20a *dbg_s,
+                                                                u32 profiler_handle);
+
+static int dbg_unbind_all_channels_gk20a(struct dbg_session_gk20a *dbg_s);
+
+static int gk20a_dbg_gpu_do_dev_open(struct inode *inode,
+                struct file *filp, bool is_profiler);
+
+static int nvgpu_set_sm_exception_type_mask_locked(
+                                        struct dbg_session_gk20a *dbg_s,
+                                        u32 exception_mask);
+
+unsigned int gk20a_dbg_gpu_dev_poll(struct file *filep, poll_table *wait)
+{
+        unsigned int mask = 0;
+        struct dbg_session_gk20a_linux *dbg_session_linux = filep->private_data;
+        struct dbg_session_gk20a *dbg_s = &dbg_session_linux->dbg_s;
+        struct gk20a *g = dbg_s->g;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_gpu_dbg, " ");
+
+        poll_wait(filep, &dbg_s->dbg_events.wait_queue.wq, wait);
+
+        gk20a_dbg_session_nvgpu_mutex_acquire(dbg_s);
+
+        if (dbg_s->dbg_events.events_enabled &&
+                        dbg_s->dbg_events.num_pending_events > 0) {
+                nvgpu_log(g, gpu_dbg_gpu_dbg, "found pending event on session id %d",
+                                dbg_s->id);
+                nvgpu_log(g, gpu_dbg_gpu_dbg, "%d events pending",
+                                dbg_s->dbg_events.num_pending_events);
+                mask = (POLLPRI | POLLIN);
+        }
+
+        gk20a_dbg_session_nvgpu_mutex_release(dbg_s);
+
+        return mask;
+}
+
+int gk20a_dbg_gpu_dev_release(struct inode *inode, struct file *filp)
+{
+        struct dbg_session_gk20a_linux *dbg_session_linux = filp->private_data;
+        struct dbg_session_gk20a *dbg_s = &dbg_session_linux->dbg_s;
+        struct gk20a *g = dbg_s->g;
+        struct dbg_profiler_object_data *prof_obj, *tmp_obj;
+
+        nvgpu_log(g, gpu_dbg_gpu_dbg | gpu_dbg_fn, "%s", g->name);
+
+        /* unbind channels */
+        dbg_unbind_all_channels_gk20a(dbg_s);
+
+        /* Powergate/Timeout enable is called here as possibility of dbg_session
+         * which called powergate/timeout disable ioctl, to be killed without
+         * calling powergate/timeout enable ioctl
+         */
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        if (dbg_s->is_pg_disabled) {
+                nvgpu_set_powergate_locked(dbg_s, false);
+        }
+        nvgpu_dbg_timeout_enable(dbg_s, NVGPU_DBG_GPU_IOCTL_TIMEOUT_ENABLE);
+
+        /* If this session owned the perf buffer, release it */
+        if (g->perfbuf.owner == dbg_s)
+                gk20a_perfbuf_release_locked(g, g->perfbuf.offset);
+
+        /* Per-context profiler objects were released when we called
+         * dbg_unbind_all_channels. We could still have global ones.
+         */
+        nvgpu_list_for_each_entry_safe(prof_obj, tmp_obj, &g->profiler_objects,
+                                dbg_profiler_object_data, prof_obj_entry) {
+                if (prof_obj->session_id == dbg_s->id) {
+                        if (prof_obj->has_reservation)
+                                g->ops.dbg_session_ops.
+                                  release_profiler_reservation(dbg_s, prof_obj);
+                        nvgpu_list_del(&prof_obj->prof_obj_entry);
+                        nvgpu_kfree(g, prof_obj);
+                }
+        }
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        nvgpu_mutex_destroy(&dbg_s->ch_list_lock);
+        nvgpu_mutex_destroy(&dbg_s->ioctl_lock);
+
+        nvgpu_kfree(g, dbg_session_linux);
+        gk20a_put(g);
+
+        return 0;
+}
+
+int gk20a_prof_gpu_dev_open(struct inode *inode, struct file *filp)
+{
+        struct nvgpu_os_linux *l = container_of(inode->i_cdev,
+                         struct nvgpu_os_linux, prof.cdev);
+        struct gk20a *g = &l->g;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_gpu_dbg, " ");
+        return gk20a_dbg_gpu_do_dev_open(inode, filp, true /* is profiler */);
+}
+
+static int nvgpu_dbg_gpu_ioctl_timeout(struct dbg_session_gk20a *dbg_s,
+                         struct nvgpu_dbg_gpu_timeout_args *args)
+{
+        int err;
+        struct gk20a *g = dbg_s->g;
+
+        nvgpu_log(g, gpu_dbg_fn, "timeout enable/disable = %d", args->enable);
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        err = nvgpu_dbg_timeout_enable(dbg_s, args->enable);
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        return err;
+}
+
+static int nvgpu_dbg_gpu_ioctl_read_single_sm_error_state(
+                struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_read_single_sm_error_state_args *args)
+{
+        struct gk20a *g = dbg_s->g;
+        struct gr_gk20a *gr = &g->gr;
+        struct nvgpu_tsg_sm_error_state *sm_error_state;
+        struct nvgpu_dbg_gpu_sm_error_state_record sm_error_state_record;
+        struct channel_gk20a *ch;
+        struct tsg_gk20a *tsg;
+        u32 sm_id;
+        int err = 0;
+
+        ch = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+        if (ch == NULL) {
+                return -EINVAL;
+        }
+
+        tsg = tsg_gk20a_from_ch(ch);
+        if (tsg == NULL) {
+                nvgpu_err(g, "no valid tsg from ch");
+                return -EINVAL;
+        }
+
+        sm_id = args->sm_id;
+        if (sm_id >= gr->no_of_sm) {
+                return -EINVAL;
+        }
+
+        if (tsg->sm_error_states == NULL) {
+                return -EINVAL;
+        }
+
+        nvgpu_speculation_barrier();
+
+        sm_error_state = tsg->sm_error_states + sm_id;
+        sm_error_state_record.hww_global_esr =
+                sm_error_state->hww_global_esr;
+        sm_error_state_record.hww_warp_esr =
+                sm_error_state->hww_warp_esr;
+        sm_error_state_record.hww_warp_esr_pc =
+                sm_error_state->hww_warp_esr_pc;
+        sm_error_state_record.hww_global_esr_report_mask =
+                sm_error_state->hww_global_esr_report_mask;
+        sm_error_state_record.hww_warp_esr_report_mask =
+                sm_error_state->hww_warp_esr_report_mask;
+
+        if (args->sm_error_state_record_size > 0) {
+                size_t write_size = sizeof(*sm_error_state);
+
+                nvgpu_speculation_barrier();
+                if (write_size > args->sm_error_state_record_size)
+                        write_size = args->sm_error_state_record_size;
+
+                nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+                err = copy_to_user((void __user *)(uintptr_t)
+                                                args->sm_error_state_record_mem,
+                                   &sm_error_state_record,
+                                   write_size);
+                nvgpu_mutex_release(&g->dbg_sessions_lock);
+                if (err != 0) {
+                        nvgpu_err(g, "copy_to_user failed!");
+                        return err;
+                }
+
+                args->sm_error_state_record_size = write_size;
+        }
+
+        return 0;
+}
+
+
+static int nvgpu_dbg_gpu_ioctl_set_next_stop_trigger_type(
+                struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_set_next_stop_trigger_type_args *args)
+{
+        struct gk20a *g = dbg_s->g;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_gpu_dbg, " ");
+
+        gk20a_dbg_session_nvgpu_mutex_acquire(dbg_s);
+
+        dbg_s->broadcast_stop_trigger = (args->broadcast != 0);
+
+        gk20a_dbg_session_nvgpu_mutex_release(dbg_s);
+
+        return 0;
+}
+
+static int nvgpu_dbg_timeout_enable(struct dbg_session_gk20a *dbg_s,
+                          int timeout_mode)
+{
+        struct gk20a *g = dbg_s->g;
+        int err = 0;
+
+        nvgpu_log(g, gpu_dbg_gpu_dbg, "Timeouts mode requested : %d",
+                        timeout_mode);
+
+        nvgpu_speculation_barrier();
+        switch (timeout_mode) {
+        case NVGPU_DBG_GPU_IOCTL_TIMEOUT_ENABLE:
+                if (dbg_s->is_timeout_disabled == true)
+                        nvgpu_atomic_dec(&g->timeouts_disabled_refcount);
+                dbg_s->is_timeout_disabled = false;
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_TIMEOUT_DISABLE:
+                if (dbg_s->is_timeout_disabled == false)
+                        nvgpu_atomic_inc(&g->timeouts_disabled_refcount);
+                dbg_s->is_timeout_disabled = true;
+                break;
+
+        default:
+                nvgpu_err(g,
+                           "unrecognized dbg gpu timeout mode : 0x%x",
+                           timeout_mode);
+                err = -EINVAL;
+                break;
+        }
+
+        if (!err)
+                nvgpu_log(g, gpu_dbg_gpu_dbg, "dbg is timeout disabled %s, "
+                                "timeouts disabled refcount %d",
+                        dbg_s->is_timeout_disabled ? "true" : "false",
+                        nvgpu_atomic_read(&g->timeouts_disabled_refcount));
+        return err;
+}
+
+static int gk20a_dbg_gpu_do_dev_open(struct inode *inode,
+                struct file *filp, bool is_profiler)
+{
+        struct nvgpu_os_linux *l;
+        struct dbg_session_gk20a_linux *dbg_session_linux;
+        struct dbg_session_gk20a *dbg_s;
+        struct gk20a *g;
+
+        struct device *dev;
+
+        int err;
+
+        if (!is_profiler)
+                l = container_of(inode->i_cdev,
+                                 struct nvgpu_os_linux, dbg.cdev);
+        else
+                l = container_of(inode->i_cdev,
+                                 struct nvgpu_os_linux, prof.cdev);
+        g = gk20a_get(&l->g);
+        if (!g)
+                return -ENODEV;
+
+        dev = dev_from_gk20a(g);
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_gpu_dbg, "dbg session: %s", g->name);
+
+        err  = alloc_session(g, &dbg_session_linux);
+        if (err)
+                goto free_ref;
+
+        dbg_s = &dbg_session_linux->dbg_s;
+
+        filp->private_data = dbg_session_linux;
+        dbg_session_linux->dev   = dev;
+        dbg_s->g     = g;
+        dbg_s->is_profiler = is_profiler;
+        dbg_s->is_pg_disabled = false;
+        dbg_s->is_timeout_disabled = false;
+
+        nvgpu_cond_init(&dbg_s->dbg_events.wait_queue);
+        nvgpu_init_list_node(&dbg_s->ch_list);
+        err = nvgpu_mutex_init(&dbg_s->ch_list_lock);
+        if (err)
+                goto err_free_session;
+        err = nvgpu_mutex_init(&dbg_s->ioctl_lock);
+        if (err)
+                goto err_destroy_lock;
+        dbg_s->dbg_events.events_enabled = false;
+        dbg_s->dbg_events.num_pending_events = 0;
+
+        return 0;
+
+err_destroy_lock:
+        nvgpu_mutex_destroy(&dbg_s->ch_list_lock);
+err_free_session:
+        nvgpu_kfree(g, dbg_session_linux);
+free_ref:
+        gk20a_put(g);
+        return err;
+}
+
+void nvgpu_dbg_session_post_event(struct dbg_session_gk20a *dbg_s)
+{
+        nvgpu_cond_broadcast_interruptible(&dbg_s->dbg_events.wait_queue);
+}
+
+static int dbg_unbind_single_channel_gk20a(struct dbg_session_gk20a *dbg_s,
+                        struct dbg_session_channel_data *ch_data)
+{
+        struct gk20a *g = dbg_s->g;
+        u32 chid;
+        struct dbg_session_data *session_data;
+        struct dbg_profiler_object_data *prof_obj, *tmp_obj;
+        struct dbg_session_channel_data_linux *ch_data_linux;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_gpu_dbg, " ");
+
+        chid = ch_data->chid;
+
+        /* If there's a profiler ctx reservation record associated with this
+         * session/channel pair, release it.
+         */
+        nvgpu_list_for_each_entry_safe(prof_obj, tmp_obj, &g->profiler_objects,
+                                dbg_profiler_object_data, prof_obj_entry) {
+                if ((prof_obj->session_id == dbg_s->id) &&
+                        (prof_obj->ch->chid == chid)) {
+                        if (prof_obj->has_reservation) {
+                                g->ops.dbg_session_ops.
+                                  release_profiler_reservation(dbg_s, prof_obj);
+                        }
+                        nvgpu_list_del(&prof_obj->prof_obj_entry);
+                        nvgpu_kfree(g, prof_obj);
+                }
+        }
+
+        nvgpu_list_del(&ch_data->ch_entry);
+
+        session_data = ch_data->session_data;
+        nvgpu_list_del(&session_data->dbg_s_entry);
+        nvgpu_kfree(dbg_s->g, session_data);
+
+        ch_data_linux = container_of(ch_data, struct dbg_session_channel_data_linux,
+                                                                                ch_data);
+
+        fput(ch_data_linux->ch_f);
+        nvgpu_kfree(dbg_s->g, ch_data_linux);
+
+        return 0;
+}
+
+static int dbg_bind_channel_gk20a(struct dbg_session_gk20a *dbg_s,
+                          struct nvgpu_dbg_gpu_bind_channel_args *args)
+{
+        struct file *f;
+        struct gk20a *g = dbg_s->g;
+        struct channel_gk20a *ch;
+        struct dbg_session_channel_data_linux *ch_data_linux;
+        struct dbg_session_data *session_data;
+        int err = 0;
+
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_gpu_dbg, "%s fd=%d",
+                   g->name, args->channel_fd);
+
+        /*
+         * Although gk20a_get_channel_from_file gives us a channel ref, need to
+         * hold a ref to the file during the session lifetime. See comment in
+         * struct dbg_session_channel_data.
+         */
+        f = fget(args->channel_fd);
+        if (!f)
+                return -ENODEV;
+
+        ch = gk20a_get_channel_from_file(args->channel_fd);
+        if (!ch) {
+                nvgpu_log_fn(g, "no channel found for fd");
+                err = -EINVAL;
+                goto out_fput;
+        }
+
+        nvgpu_log_fn(g, "%s hwchid=%d", g->name, ch->chid);
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        nvgpu_mutex_acquire(&ch->dbg_s_lock);
+
+        ch_data_linux = nvgpu_kzalloc(g, sizeof(*ch_data_linux));
+        if (!ch_data_linux) {
+                err = -ENOMEM;
+                goto out_chput;
+        }
+        ch_data_linux->ch_f = f;
+        ch_data_linux->ch_data.channel_fd = args->channel_fd;
+        ch_data_linux->ch_data.chid = ch->chid;
+        ch_data_linux->ch_data.unbind_single_channel = dbg_unbind_single_channel_gk20a;
+        nvgpu_init_list_node(&ch_data_linux->ch_data.ch_entry);
+
+        session_data = nvgpu_kzalloc(g, sizeof(*session_data));
+        if (!session_data) {
+                err = -ENOMEM;
+                goto out_kfree;
+        }
+        session_data->dbg_s = dbg_s;
+        nvgpu_init_list_node(&session_data->dbg_s_entry);
+        ch_data_linux->ch_data.session_data = session_data;
+
+        nvgpu_list_add(&session_data->dbg_s_entry, &ch->dbg_s_list);
+
+        nvgpu_mutex_acquire(&dbg_s->ch_list_lock);
+        nvgpu_list_add_tail(&ch_data_linux->ch_data.ch_entry, &dbg_s->ch_list);
+        nvgpu_mutex_release(&dbg_s->ch_list_lock);
+
+        nvgpu_mutex_release(&ch->dbg_s_lock);
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        gk20a_channel_put(ch);
+
+        return 0;
+
+out_kfree:
+        nvgpu_kfree(g, ch_data_linux);
+out_chput:
+        gk20a_channel_put(ch);
+        nvgpu_mutex_release(&ch->dbg_s_lock);
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+out_fput:
+        fput(f);
+        return err;
+}
+
+static int dbg_unbind_all_channels_gk20a(struct dbg_session_gk20a *dbg_s)
+{
+        struct dbg_session_channel_data *ch_data, *tmp;
+        struct gk20a *g = dbg_s->g;
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        nvgpu_mutex_acquire(&dbg_s->ch_list_lock);
+        nvgpu_list_for_each_entry_safe(ch_data, tmp, &dbg_s->ch_list,
+                                dbg_session_channel_data, ch_entry)
+                ch_data->unbind_single_channel(dbg_s, ch_data);
+        nvgpu_mutex_release(&dbg_s->ch_list_lock);
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        return 0;
+}
+
+/*
+ * Convert common regops op values of the form of NVGPU_DBG_REG_OP_*
+ * into linux regops op values of the form of NVGPU_DBG_GPU_REG_OP_*
+ */
+static u32 nvgpu_get_regops_op_values_linux(u32 regops_op)
+{
+        switch (regops_op) {
+        case REGOP(READ_32):
+                return REGOP_LINUX(READ_32);
+        case REGOP(WRITE_32):
+                return REGOP_LINUX(WRITE_32);
+        case REGOP(READ_64):
+                return REGOP_LINUX(READ_64);
+        case REGOP(WRITE_64):
+                return REGOP_LINUX(WRITE_64);
+        case REGOP(READ_08):
+                return REGOP_LINUX(READ_08);
+        case REGOP(WRITE_08):
+                return REGOP_LINUX(WRITE_08);
+        }
+
+        return regops_op;
+}
+
+/*
+ * Convert linux regops op values of the form of NVGPU_DBG_GPU_REG_OP_*
+ * into common regops op values of the form of NVGPU_DBG_REG_OP_*
+ */
+static u32 nvgpu_get_regops_op_values_common(u32 regops_op)
+{
+        switch (regops_op) {
+        case REGOP_LINUX(READ_32):
+                return REGOP(READ_32);
+        case REGOP_LINUX(WRITE_32):
+                return REGOP(WRITE_32);
+        case REGOP_LINUX(READ_64):
+                return REGOP(READ_64);
+        case REGOP_LINUX(WRITE_64):
+                return REGOP(WRITE_64);
+        case REGOP_LINUX(READ_08):
+                return REGOP(READ_08);
+        case REGOP_LINUX(WRITE_08):
+                return REGOP(WRITE_08);
+        }
+
+        return regops_op;
+}
+
+/*
+ * Convert common regops type values of the form of NVGPU_DBG_REG_OP_TYPE_*
+ * into linux regops type values of the form of NVGPU_DBG_GPU_REG_OP_TYPE_*
+ */
+static u32 nvgpu_get_regops_type_values_linux(u32 regops_type)
+{
+        switch (regops_type) {
+        case REGOP(TYPE_GLOBAL):
+                return REGOP_LINUX(TYPE_GLOBAL);
+        case REGOP(TYPE_GR_CTX):
+                return REGOP_LINUX(TYPE_GR_CTX);
+        case REGOP(TYPE_GR_CTX_TPC):
+                return REGOP_LINUX(TYPE_GR_CTX_TPC);
+        case REGOP(TYPE_GR_CTX_SM):
+                return REGOP_LINUX(TYPE_GR_CTX_SM);
+        case REGOP(TYPE_GR_CTX_CROP):
+                return REGOP_LINUX(TYPE_GR_CTX_CROP);
+        case REGOP(TYPE_GR_CTX_ZROP):
+                return REGOP_LINUX(TYPE_GR_CTX_ZROP);
+        case REGOP(TYPE_GR_CTX_QUAD):
+                return REGOP_LINUX(TYPE_GR_CTX_QUAD);
+        }
+
+        return regops_type;
+}
+
+/*
+ * Convert linux regops type values of the form of NVGPU_DBG_GPU_REG_OP_TYPE_*
+ * into common regops type values of the form of NVGPU_DBG_REG_OP_TYPE_*
+ */
+static u32 nvgpu_get_regops_type_values_common(u32 regops_type)
+{
+        switch (regops_type) {
+        case REGOP_LINUX(TYPE_GLOBAL):
+                return REGOP(TYPE_GLOBAL);
+        case REGOP_LINUX(TYPE_GR_CTX):
+                return REGOP(TYPE_GR_CTX);
+        case REGOP_LINUX(TYPE_GR_CTX_TPC):
+                return REGOP(TYPE_GR_CTX_TPC);
+        case REGOP_LINUX(TYPE_GR_CTX_SM):
+                return REGOP(TYPE_GR_CTX_SM);
+        case REGOP_LINUX(TYPE_GR_CTX_CROP):
+                return REGOP(TYPE_GR_CTX_CROP);
+        case REGOP_LINUX(TYPE_GR_CTX_ZROP):
+                return REGOP(TYPE_GR_CTX_ZROP);
+        case REGOP_LINUX(TYPE_GR_CTX_QUAD):
+                return REGOP(TYPE_GR_CTX_QUAD);
+        }
+
+        return regops_type;
+}
+
+/*
+ * Convert common regops status values of the form of NVGPU_DBG_REG_OP_STATUS_*
+ * into linux regops type values of the form of NVGPU_DBG_GPU_REG_OP_STATUS_*
+ */
+static u32 nvgpu_get_regops_status_values_linux(u32 regops_status)
+{
+        switch (regops_status) {
+        case REGOP(STATUS_SUCCESS):
+                return REGOP_LINUX(STATUS_SUCCESS);
+        case REGOP(STATUS_INVALID_OP):
+                return REGOP_LINUX(STATUS_INVALID_OP);
+        case REGOP(STATUS_INVALID_TYPE):
+                return REGOP_LINUX(STATUS_INVALID_TYPE);
+        case REGOP(STATUS_INVALID_OFFSET):
+                return REGOP_LINUX(STATUS_INVALID_OFFSET);
+        case REGOP(STATUS_UNSUPPORTED_OP):
+                return REGOP_LINUX(STATUS_UNSUPPORTED_OP);
+        case REGOP(STATUS_INVALID_MASK ):
+                return REGOP_LINUX(STATUS_INVALID_MASK);
+        }
+
+        return regops_status;
+}
+
+/*
+ * Convert linux regops status values of the form of NVGPU_DBG_GPU_REG_OP_STATUS_*
+ * into common regops type values of the form of NVGPU_DBG_REG_OP_STATUS_*
+ */
+static u32 nvgpu_get_regops_status_values_common(u32 regops_status)
+{
+        switch (regops_status) {
+        case REGOP_LINUX(STATUS_SUCCESS):
+                return REGOP(STATUS_SUCCESS);
+        case REGOP_LINUX(STATUS_INVALID_OP):
+                return REGOP(STATUS_INVALID_OP);
+        case REGOP_LINUX(STATUS_INVALID_TYPE):
+                return REGOP(STATUS_INVALID_TYPE);
+        case REGOP_LINUX(STATUS_INVALID_OFFSET):
+                return REGOP(STATUS_INVALID_OFFSET);
+        case REGOP_LINUX(STATUS_UNSUPPORTED_OP):
+                return REGOP(STATUS_UNSUPPORTED_OP);
+        case REGOP_LINUX(STATUS_INVALID_MASK ):
+                return REGOP(STATUS_INVALID_MASK);
+        }
+
+        return regops_status;
+}
+
+static int nvgpu_get_regops_data_common(struct nvgpu_dbg_gpu_reg_op *in,
+                struct nvgpu_dbg_reg_op *out, u32 num_ops)
+{
+        u32 i;
+
+        if(in == NULL || out == NULL)
+                return -ENOMEM;
+
+        for (i = 0; i < num_ops; i++) {
+                out[i].op = nvgpu_get_regops_op_values_common(in[i].op);
+                out[i].type = nvgpu_get_regops_type_values_common(in[i].type);
+                out[i].status = nvgpu_get_regops_status_values_common(in[i].status);
+                out[i].quad = in[i].quad;
+                out[i].group_mask = in[i].group_mask;
+                out[i].sub_group_mask = in[i].sub_group_mask;
+                out[i].offset = in[i].offset;
+                out[i].value_lo = in[i].value_lo;
+                out[i].value_hi = in[i].value_hi;
+                out[i].and_n_mask_lo = in[i].and_n_mask_lo;
+                out[i].and_n_mask_hi = in[i].and_n_mask_hi;
+        }
+
+        return 0;
+}
+
+static int nvgpu_get_regops_data_linux(struct nvgpu_dbg_reg_op *in,
+                struct nvgpu_dbg_gpu_reg_op *out, u32 num_ops)
+{
+        u32 i;
+
+        if(in == NULL || out == NULL)
+                return -ENOMEM;
+
+        for (i = 0; i < num_ops; i++) {
+                out[i].op = nvgpu_get_regops_op_values_linux(in[i].op);
+                out[i].type = nvgpu_get_regops_type_values_linux(in[i].type);
+                out[i].status = nvgpu_get_regops_status_values_linux(in[i].status);
+                out[i].quad = in[i].quad;
+                out[i].group_mask = in[i].group_mask;
+                out[i].sub_group_mask = in[i].sub_group_mask;
+                out[i].offset = in[i].offset;
+                out[i].value_lo = in[i].value_lo;
+                out[i].value_hi = in[i].value_hi;
+                out[i].and_n_mask_lo = in[i].and_n_mask_lo;
+                out[i].and_n_mask_hi = in[i].and_n_mask_hi;
+        }
+
+        return 0;
+}
+
+static int nvgpu_ioctl_channel_reg_ops(struct dbg_session_gk20a *dbg_s,
+                                struct nvgpu_dbg_gpu_exec_reg_ops_args *args)
+{
+        int err = 0, powergate_err = 0;
+        bool is_pg_disabled = false;
+
+        struct gk20a *g = dbg_s->g;
+        struct channel_gk20a *ch;
+
+        bool is_current_ctx;
+
+
+        nvgpu_log_fn(g, "%d ops, max fragment %d", args->num_ops, g->dbg_regops_tmp_buf_ops);
+
+        if (args->num_ops > NVGPU_IOCTL_DBG_REG_OPS_LIMIT) {
+                nvgpu_err(g, "regops limit exceeded");
+                return -EINVAL;
+        }
+
+        if (args->num_ops == 0) {
+                /* Nothing to do */
+                return 0;
+        }
+
+        if (g->dbg_regops_tmp_buf_ops == 0 || !g->dbg_regops_tmp_buf) {
+                nvgpu_err(g, "reg ops work buffer not allocated");
+                return -ENODEV;
+        }
+
+        if (!dbg_s->id) {
+                nvgpu_err(g, "can't call reg_ops on an unbound debugger session");
+                return -EINVAL;
+        }
+
+        ch = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+        if (!dbg_s->is_profiler && !ch) {
+                nvgpu_err(g, "bind a channel before regops for a debugging session");
+                return -EINVAL;
+        }
+
+        /* since exec_reg_ops sends methods to the ucode, it must take the
+         * global gpu lock to protect against mixing methods from debug sessions
+         * on other channels */
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+
+        if (!dbg_s->is_pg_disabled && !g->is_virtual) {
+                /* In the virtual case, the server will handle
+                 * disabling/enabling powergating when processing reg ops
+                 */
+                powergate_err = nvgpu_set_powergate_locked(dbg_s, true);
+                if (!powergate_err) {
+                        is_pg_disabled = true;
+                }
+        }
+
+        if (!powergate_err) {
+                u64 ops_offset = 0; /* index offset */
+
+                struct nvgpu_dbg_gpu_reg_op *linux_fragment = NULL;
+
+                linux_fragment = nvgpu_kzalloc(g, g->dbg_regops_tmp_buf_ops *
+                                sizeof(struct nvgpu_dbg_gpu_reg_op));
+
+                if (!linux_fragment)
+                        return -ENOMEM;
+
+                while (ops_offset < args->num_ops && !err) {
+                        const u64 num_ops =
+                                min(args->num_ops - ops_offset,
+                                    (u64)(g->dbg_regops_tmp_buf_ops));
+                        const u64 fragment_size =
+                                num_ops * sizeof(struct nvgpu_dbg_gpu_reg_op);
+
+                        void __user *const fragment =
+                                (void __user *)(uintptr_t)
+                                (args->ops +
+                                 ops_offset * sizeof(struct nvgpu_dbg_gpu_reg_op));
+
+                        nvgpu_log_fn(g, "Regops fragment: start_op=%llu ops=%llu",
+                                     ops_offset, num_ops);
+
+                        nvgpu_log_fn(g, "Copying regops from userspace");
+
+                        if (copy_from_user(linux_fragment,
+                                           fragment, fragment_size)) {
+                                nvgpu_err(g, "copy_from_user failed!");
+                                err = -EFAULT;
+                                break;
+                        }
+
+                        err = nvgpu_get_regops_data_common(linux_fragment,
+                                        g->dbg_regops_tmp_buf, num_ops);
+
+                        if (err)
+                                break;
+
+                        err = g->ops.regops.exec_regops(
+                                dbg_s, g->dbg_regops_tmp_buf, num_ops, &is_current_ctx);
+
+                        if (err) {
+                                break;
+                        }
+
+                        if (ops_offset == 0) {
+                                args->gr_ctx_resident = is_current_ctx;
+                        }
+
+                        err = nvgpu_get_regops_data_linux(g->dbg_regops_tmp_buf,
+                                        linux_fragment, num_ops);
+
+                        if (err)
+                                break;
+
+                        nvgpu_log_fn(g, "Copying result to userspace");
+
+                        if (copy_to_user(fragment, linux_fragment,
+                                         fragment_size)) {
+                                nvgpu_err(g, "copy_to_user failed!");
+                                err = -EFAULT;
+                                break;
+                        }
+
+                        ops_offset += num_ops;
+                }
+
+                nvgpu_speculation_barrier();
+                nvgpu_kfree(g, linux_fragment);
+
+                /* enable powergate, if previously disabled */
+                if (is_pg_disabled) {
+                        powergate_err = nvgpu_set_powergate_locked(dbg_s,
+                                                                        false);
+                }
+        }
+
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        if (!err && powergate_err)
+                err = powergate_err;
+
+        if (err)
+                nvgpu_err(g, "dbg regops failed");
+
+        return err;
+}
+
+static int nvgpu_ioctl_powergate_gk20a(struct dbg_session_gk20a *dbg_s,
+                                struct nvgpu_dbg_gpu_powergate_args *args)
+{
+        int err;
+        struct gk20a *g = dbg_s->g;
+        nvgpu_log_fn(g, "%s  powergate mode = %d",
+                      g->name, args->mode);
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        if ((args->mode != NVGPU_DBG_GPU_POWERGATE_MODE_DISABLE) &&
+            (args->mode != NVGPU_DBG_GPU_POWERGATE_MODE_ENABLE)) {
+                nvgpu_err(g, "invalid powergate mode");
+                err = -EINVAL;
+                goto pg_err_end;
+        }
+
+        err = nvgpu_set_powergate_locked(dbg_s,
+                        args->mode == NVGPU_DBG_GPU_POWERGATE_MODE_DISABLE);
+pg_err_end:
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+        return  err;
+}
+
+static int nvgpu_dbg_gpu_ioctl_smpc_ctxsw_mode(struct dbg_session_gk20a *dbg_s,
+                               struct nvgpu_dbg_gpu_smpc_ctxsw_mode_args *args)
+{
+        int err;
+        struct gk20a *g = dbg_s->g;
+        struct channel_gk20a *ch_gk20a;
+
+        nvgpu_log_fn(g, "%s smpc ctxsw mode = %d",
+                     g->name, args->mode);
+
+        err = gk20a_busy(g);
+        if (err) {
+                nvgpu_err(g, "failed to poweron");
+                return err;
+        }
+
+        /* Take the global lock, since we'll be doing global regops */
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+
+        ch_gk20a = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+        if (!ch_gk20a) {
+                nvgpu_err(g,
+                          "no bound channel for smpc ctxsw mode update");
+                err = -EINVAL;
+                goto clean_up;
+        }
+
+        err = g->ops.gr.update_smpc_ctxsw_mode(g, ch_gk20a,
+                                args->mode == NVGPU_DBG_GPU_SMPC_CTXSW_MODE_CTXSW);
+        if (err) {
+                nvgpu_err(g,
+                          "error (%d) during smpc ctxsw mode update", err);
+        }
+
+ clean_up:
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+        gk20a_idle(g);
+        return  err;
+}
+
+/*
+ * Convert linux hwpm ctxsw mode type of the form of NVGPU_DBG_GPU_HWPM_CTXSW_MODE_*
+ * into common hwpm ctxsw mode type of the form of NVGPU_DBG_HWPM_CTXSW_MODE_*
+ */
+
+static u32 nvgpu_hwpm_ctxsw_mode_to_common_mode(u32 mode)
+{
+        nvgpu_speculation_barrier();
+        switch (mode){
+        case NVGPU_DBG_GPU_HWPM_CTXSW_MODE_NO_CTXSW:
+                return NVGPU_DBG_HWPM_CTXSW_MODE_NO_CTXSW;
+        case NVGPU_DBG_GPU_HWPM_CTXSW_MODE_CTXSW:
+                return NVGPU_DBG_HWPM_CTXSW_MODE_CTXSW;
+        case NVGPU_DBG_GPU_HWPM_CTXSW_MODE_STREAM_OUT_CTXSW:
+                return NVGPU_DBG_HWPM_CTXSW_MODE_STREAM_OUT_CTXSW;
+        }
+
+        return mode;
+}
+
+
+static int nvgpu_dbg_gpu_ioctl_hwpm_ctxsw_mode(struct dbg_session_gk20a *dbg_s,
+                               struct nvgpu_dbg_gpu_hwpm_ctxsw_mode_args *args)
+{
+        int err;
+        struct gk20a *g = dbg_s->g;
+        struct channel_gk20a *ch_gk20a;
+        u32 mode = nvgpu_hwpm_ctxsw_mode_to_common_mode(args->mode);
+
+        nvgpu_log_fn(g, "%s pm ctxsw mode = %d", g->name, args->mode);
+
+        /* Must have a valid reservation to enable/disable hwpm cxtsw.
+         * Just print an error message for now, but eventually this should
+         * return an error, at the point where all client sw has been
+         * cleaned up.
+         */
+        if (!dbg_s->has_profiler_reservation) {
+                nvgpu_err(g,
+                        "session doesn't have a valid reservation");
+        }
+
+        err = gk20a_busy(g);
+        if (err) {
+                nvgpu_err(g, "failed to poweron");
+                return err;
+        }
+
+        /* Take the global lock, since we'll be doing global regops */
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+
+        ch_gk20a = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+        if (!ch_gk20a) {
+                nvgpu_err(g,
+                          "no bound channel for pm ctxsw mode update");
+                err = -EINVAL;
+                goto clean_up;
+        }
+        if (g->dbg_powergating_disabled_refcount == 0) {
+                nvgpu_err(g, "powergate is not disabled");
+                err = -ENOSYS;
+                goto clean_up;
+        }
+        err = g->ops.gr.update_hwpm_ctxsw_mode(g, ch_gk20a, 0,
+                mode);
+
+        if (err)
+                nvgpu_err(g,
+                        "error (%d) during pm ctxsw mode update", err);
+        /* gk20a would require a WAR to set the core PM_ENABLE bit, not
+         * added here with gk20a being deprecated
+         */
+ clean_up:
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+        gk20a_idle(g);
+        return  err;
+}
+
+static int nvgpu_dbg_gpu_ioctl_set_mmu_debug_mode(
+                struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_set_ctx_mmu_debug_mode_args *args)
+{
+        int err;
+        struct gk20a *g = dbg_s->g;
+        struct channel_gk20a *ch;
+        bool enable = (args->mode == NVGPU_DBG_GPU_CTX_MMU_DEBUG_MODE_ENABLED);
+
+        nvgpu_log_fn(g, "mode=%u", args->mode);
+
+        if (args->reserved != 0U) {
+                return -EINVAL;
+        }
+
+        if ((g->ops.fb.set_mmu_debug_mode == NULL) &&
+                (g->ops.gr.set_mmu_debug_mode == NULL)) {
+                return -ENOSYS;
+        }
+
+        err = gk20a_busy(g);
+        if (err) {
+                nvgpu_err(g, "failed to poweron");
+                return err;
+        }
+
+        /* Take the global lock, since we'll be doing global regops */
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+
+        ch = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+        if (!ch) {
+                nvgpu_err(g, "no bound channel for mmu debug mode");
+                err = -EINVAL;
+                goto clean_up;
+        }
+
+        err = nvgpu_tsg_set_mmu_debug_mode(ch, enable);
+        if (err) {
+                nvgpu_err(g, "set mmu debug mode failed, err=%d", err);
+        }
+
+clean_up:
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+        gk20a_idle(g);
+        return err;
+}
+
+static int nvgpu_dbg_gpu_ioctl_suspend_resume_sm(
+                struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_suspend_resume_all_sms_args *args)
+{
+        struct gk20a *g = dbg_s->g;
+        struct channel_gk20a *ch;
+        int err = 0, action = args->mode;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_gpu_dbg, "action: %d", args->mode);
+
+        ch = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+        if (!ch)
+                return -EINVAL;
+
+        err = gk20a_busy(g);
+        if (err) {
+                nvgpu_err(g, "failed to poweron");
+                return err;
+        }
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+
+        /* Suspend GPU context switching */
+        err = gr_gk20a_disable_ctxsw(g);
+        if (err) {
+                nvgpu_err(g, "unable to stop gr ctxsw");
+                /* this should probably be ctx-fatal... */
+                goto clean_up;
+        }
+
+        nvgpu_speculation_barrier();
+        switch (action) {
+        case NVGPU_DBG_GPU_SUSPEND_ALL_SMS:
+                gr_gk20a_suspend_context(ch);
+                break;
+
+        case NVGPU_DBG_GPU_RESUME_ALL_SMS:
+                gr_gk20a_resume_context(ch);
+                break;
+        }
+
+        err = gr_gk20a_enable_ctxsw(g);
+        if (err)
+                nvgpu_err(g, "unable to restart ctxsw!");
+
+clean_up:
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+        gk20a_idle(g);
+
+        return  err;
+}
+
+static int nvgpu_ioctl_allocate_profiler_object(
+                                struct dbg_session_gk20a_linux *dbg_session_linux,
+                                struct nvgpu_dbg_gpu_profiler_obj_mgt_args *args)
+{
+        int err = 0;
+        struct dbg_session_gk20a *dbg_s = &dbg_session_linux->dbg_s;
+        struct gk20a *g = get_gk20a(dbg_session_linux->dev);
+        struct dbg_profiler_object_data *prof_obj;
+
+        nvgpu_log_fn(g, "%s", g->name);
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+
+        err = alloc_profiler(g, &prof_obj);
+        if (err)
+                goto clean_up;
+
+        prof_obj->session_id = dbg_s->id;
+
+        if (dbg_s->is_profiler)
+                prof_obj->ch = NULL;
+        else {
+                prof_obj->ch = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+                if (prof_obj->ch == NULL) {
+                        nvgpu_err(g,
+                                "bind a channel for dbg session");
+                        nvgpu_kfree(g, prof_obj);
+                        err = -EINVAL;
+                        goto clean_up;
+                }
+        }
+
+        /* Return handle to client */
+        args->profiler_handle = prof_obj->prof_handle;
+
+        nvgpu_init_list_node(&prof_obj->prof_obj_entry);
+
+        nvgpu_list_add(&prof_obj->prof_obj_entry, &g->profiler_objects);
+clean_up:
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+        return  err;
+}
+
+static int nvgpu_ioctl_free_profiler_object(
+                                struct dbg_session_gk20a_linux *dbg_s_linux,
+                                struct nvgpu_dbg_gpu_profiler_obj_mgt_args *args)
+{
+        int err = 0;
+        struct dbg_session_gk20a *dbg_s = &dbg_s_linux->dbg_s;
+        struct gk20a *g = get_gk20a(dbg_s_linux->dev);
+        struct dbg_profiler_object_data *prof_obj, *tmp_obj;
+        bool obj_found = false;
+
+        nvgpu_log_fn(g, "%s session_id = %d profiler_handle = %x",
+                     g->name, dbg_s->id, args->profiler_handle);
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+
+        /* Remove profiler object from the list, if a match is found */
+        nvgpu_list_for_each_entry_safe(prof_obj, tmp_obj, &g->profiler_objects,
+                                dbg_profiler_object_data, prof_obj_entry) {
+                if (prof_obj->prof_handle == args->profiler_handle) {
+                        if (prof_obj->session_id != dbg_s->id) {
+                                nvgpu_err(g,
+                                                "invalid handle %x",
+                                                args->profiler_handle);
+                                err = -EINVAL;
+                                break;
+                        }
+                        if (prof_obj->has_reservation)
+                                g->ops.dbg_session_ops.
+                                  release_profiler_reservation(dbg_s, prof_obj);
+                        nvgpu_list_del(&prof_obj->prof_obj_entry);
+                        nvgpu_kfree(g, prof_obj);
+                        obj_found = true;
+                        break;
+                }
+        }
+        if (!obj_found) {
+                nvgpu_err(g, "profiler %x not found",
+                                                        args->profiler_handle);
+                err = -EINVAL;
+        }
+
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+        return  err;
+}
+
+static struct dbg_profiler_object_data *find_matching_prof_obj(
+                                                struct dbg_session_gk20a *dbg_s,
+                                                u32 profiler_handle)
+{
+        struct gk20a *g = dbg_s->g;
+        struct dbg_profiler_object_data *prof_obj;
+
+        nvgpu_list_for_each_entry(prof_obj, &g->profiler_objects,
+                                dbg_profiler_object_data, prof_obj_entry) {
+                if (prof_obj->prof_handle == profiler_handle) {
+                        if (prof_obj->session_id != dbg_s->id) {
+                                nvgpu_err(g,
+                                                "invalid handle %x",
+                                                profiler_handle);
+                                return NULL;
+                        }
+                        return prof_obj;
+                }
+        }
+        return NULL;
+}
+
+/* used in scenarios where the debugger session can take just the inter-session
+ * lock for performance, but the profiler session must take the per-gpu lock
+ * since it might not have an associated channel. */
+static void gk20a_dbg_session_nvgpu_mutex_acquire(struct dbg_session_gk20a *dbg_s)
+{
+        struct channel_gk20a *ch = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+
+        if (dbg_s->is_profiler || !ch)
+                nvgpu_mutex_acquire(&dbg_s->g->dbg_sessions_lock);
+        else
+                nvgpu_mutex_acquire(&ch->dbg_s_lock);
+}
+
+static void gk20a_dbg_session_nvgpu_mutex_release(struct dbg_session_gk20a *dbg_s)
+{
+        struct channel_gk20a *ch = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+
+        if (dbg_s->is_profiler || !ch)
+                nvgpu_mutex_release(&dbg_s->g->dbg_sessions_lock);
+        else
+                nvgpu_mutex_release(&ch->dbg_s_lock);
+}
+
+static void gk20a_dbg_gpu_events_enable(struct dbg_session_gk20a *dbg_s)
+{
+        struct gk20a *g = dbg_s->g;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_gpu_dbg, " ");
+
+        gk20a_dbg_session_nvgpu_mutex_acquire(dbg_s);
+
+        dbg_s->dbg_events.events_enabled = true;
+        dbg_s->dbg_events.num_pending_events = 0;
+
+        gk20a_dbg_session_nvgpu_mutex_release(dbg_s);
+}
+
+static void gk20a_dbg_gpu_events_disable(struct dbg_session_gk20a *dbg_s)
+{
+        struct gk20a *g = dbg_s->g;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_gpu_dbg, " ");
+
+        gk20a_dbg_session_nvgpu_mutex_acquire(dbg_s);
+
+        dbg_s->dbg_events.events_enabled = false;
+        dbg_s->dbg_events.num_pending_events = 0;
+
+        gk20a_dbg_session_nvgpu_mutex_release(dbg_s);
+}
+
+static void gk20a_dbg_gpu_events_clear(struct dbg_session_gk20a *dbg_s)
+{
+        struct gk20a *g = dbg_s->g;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_gpu_dbg, " ");
+
+        gk20a_dbg_session_nvgpu_mutex_acquire(dbg_s);
+
+        if (dbg_s->dbg_events.events_enabled &&
+                        dbg_s->dbg_events.num_pending_events > 0)
+                dbg_s->dbg_events.num_pending_events--;
+
+        gk20a_dbg_session_nvgpu_mutex_release(dbg_s);
+}
+
+
+static int gk20a_dbg_gpu_events_ctrl(struct dbg_session_gk20a *dbg_s,
+                          struct nvgpu_dbg_gpu_events_ctrl_args *args)
+{
+        int ret = 0;
+        struct channel_gk20a *ch;
+        struct gk20a *g = dbg_s->g;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_gpu_dbg, "dbg events ctrl cmd %d", args->cmd);
+
+        ch = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+        if (!ch) {
+                nvgpu_err(g, "no channel bound to dbg session");
+                return -EINVAL;
+        }
+
+        nvgpu_speculation_barrier();
+        switch (args->cmd) {
+        case NVGPU_DBG_GPU_EVENTS_CTRL_CMD_ENABLE:
+                gk20a_dbg_gpu_events_enable(dbg_s);
+                break;
+
+        case NVGPU_DBG_GPU_EVENTS_CTRL_CMD_DISABLE:
+                gk20a_dbg_gpu_events_disable(dbg_s);
+                break;
+
+        case NVGPU_DBG_GPU_EVENTS_CTRL_CMD_CLEAR:
+                gk20a_dbg_gpu_events_clear(dbg_s);
+                break;
+
+        default:
+                nvgpu_err(g, "unrecognized dbg gpu events ctrl cmd: 0x%x",
+                           args->cmd);
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+static int gk20a_perfbuf_map(struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_perfbuf_map_args *args)
+{
+        struct gk20a *g = dbg_s->g;
+        struct mm_gk20a *mm = &g->mm;
+        int err;
+        u32 virt_size;
+        u32 big_page_size = g->ops.mm.get_default_big_page_size();
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+
+        if (g->perfbuf.owner) {
+                nvgpu_mutex_release(&g->dbg_sessions_lock);
+                return -EBUSY;
+        }
+
+        mm->perfbuf.vm = nvgpu_vm_init(g, big_page_size,
+                        big_page_size << 10,
+                        NV_MM_DEFAULT_KERNEL_SIZE,
+                        NV_MM_DEFAULT_KERNEL_SIZE + NV_MM_DEFAULT_USER_SIZE,
+                        false, false, "perfbuf");
+        if (!mm->perfbuf.vm) {
+                nvgpu_mutex_release(&g->dbg_sessions_lock);
+                return -ENOMEM;
+        }
+
+        err = nvgpu_vm_map_buffer(mm->perfbuf.vm,
+                        args->dmabuf_fd,
+                        &args->offset,
+                        0,
+                        SZ_4K,
+                        0,
+                        0,
+                        0,
+                        0,
+                        NULL);
+        if (err)
+                goto err_remove_vm;
+
+        /* perf output buffer may not cross a 4GB boundary */
+        virt_size = u64_lo32(args->mapping_size);
+        if (u64_hi32(args->offset) != u64_hi32(args->offset + virt_size - 1)) {
+                err = -EINVAL;
+                goto err_unmap;
+        }
+
+        err = g->ops.dbg_session_ops.perfbuffer_enable(g,
+                                                args->offset, virt_size);
+        if (err)
+                goto err_unmap;
+
+        g->perfbuf.owner = dbg_s;
+        g->perfbuf.offset = args->offset;
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        return 0;
+
+err_unmap:
+        nvgpu_vm_unmap(mm->perfbuf.vm, args->offset, NULL);
+err_remove_vm:
+        nvgpu_vm_put(mm->perfbuf.vm);
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+        return err;
+}
+
+static int gk20a_perfbuf_unmap(struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_perfbuf_unmap_args *args)
+{
+        struct gk20a *g = dbg_s->g;
+        int err;
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        if ((g->perfbuf.owner != dbg_s) ||
+                                        (g->perfbuf.offset != args->offset)) {
+                nvgpu_mutex_release(&g->dbg_sessions_lock);
+                return -EINVAL;
+        }
+
+        err = gk20a_perfbuf_release_locked(g, args->offset);
+
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        return err;
+}
+
+static int gk20a_dbg_pc_sampling(struct dbg_session_gk20a *dbg_s,
+                          struct nvgpu_dbg_gpu_pc_sampling_args *args)
+{
+        struct channel_gk20a *ch;
+        struct gk20a *g = dbg_s->g;
+
+        ch = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+        if (!ch)
+                return -EINVAL;
+
+        nvgpu_log_fn(g, " ");
+
+        return g->ops.gr.update_pc_sampling ?
+                g->ops.gr.update_pc_sampling(ch, args->enable) : -EINVAL;
+}
+
+static int nvgpu_dbg_gpu_ioctl_clear_single_sm_error_state(
+                struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_clear_single_sm_error_state_args *args)
+{
+        struct gk20a *g = dbg_s->g;
+        struct gr_gk20a *gr = &g->gr;
+        u32 sm_id;
+        struct channel_gk20a *ch;
+        int err = 0;
+
+        ch = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+        if (ch == NULL) {
+                return -EINVAL;
+        }
+
+        sm_id = args->sm_id;
+        if (sm_id >= gr->no_of_sm)
+                return -EINVAL;
+
+        nvgpu_speculation_barrier();
+
+        err = gk20a_busy(g);
+        if (err != 0) {
+                return err;
+        }
+
+        err = gr_gk20a_elpg_protected_call(g,
+                        g->ops.gr.clear_sm_error_state(g, ch, sm_id));
+
+        gk20a_idle(g);
+
+        return err;
+}
+
+static int
+nvgpu_dbg_gpu_ioctl_suspend_resume_contexts(struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_suspend_resume_contexts_args *args)
+{
+        struct gk20a *g = dbg_s->g;
+        int err = 0;
+        int ctx_resident_ch_fd = -1;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        nvgpu_speculation_barrier();
+        switch (args->action) {
+        case NVGPU_DBG_GPU_SUSPEND_ALL_CONTEXTS:
+                err = g->ops.gr.suspend_contexts(g, dbg_s,
+                                        &ctx_resident_ch_fd);
+                break;
+
+        case NVGPU_DBG_GPU_RESUME_ALL_CONTEXTS:
+                err = g->ops.gr.resume_contexts(g, dbg_s,
+                                        &ctx_resident_ch_fd);
+                break;
+        }
+
+        if (ctx_resident_ch_fd < 0) {
+                args->is_resident_context = 0;
+        } else {
+                args->is_resident_context = 1;
+                args->resident_context_fd = ctx_resident_ch_fd;
+        }
+
+        gk20a_idle(g);
+
+        return err;
+}
+
+static int nvgpu_dbg_gpu_ioctl_access_fb_memory(struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_access_fb_memory_args *args)
+{
+        struct gk20a *g = dbg_s->g;
+        struct dma_buf *dmabuf;
+        void __user *user_buffer = (void __user *)(uintptr_t)args->buffer;
+        void *buffer;
+        u64 size, access_size, offset;
+        u64 access_limit_size = SZ_4K;
+        int err = 0;
+
+        if ((args->offset & 3) || (!args->size) || (args->size & 3))
+                return -EINVAL;
+
+        dmabuf = dma_buf_get(args->dmabuf_fd);
+        if (IS_ERR(dmabuf))
+                return -EINVAL;
+
+        if ((args->offset > dmabuf->size) ||
+            (args->size > dmabuf->size) ||
+            (args->offset + args->size > dmabuf->size)) {
+                err = -EINVAL;
+                goto fail_dmabuf_put;
+        }
+
+        buffer = nvgpu_big_zalloc(g, access_limit_size);
+        if (!buffer) {
+                err = -ENOMEM;
+                goto fail_dmabuf_put;
+        }
+
+        size = args->size;
+        offset = 0;
+
+        err = gk20a_busy(g);
+        if (err)
+                goto fail_free_buffer;
+
+        while (size) {
+                /* Max access size of access_limit_size in one loop */
+                access_size = min(access_limit_size, size);
+
+                if (args->cmd ==
+                    NVGPU_DBG_GPU_IOCTL_ACCESS_FB_MEMORY_CMD_WRITE) {
+                        err = copy_from_user(buffer, user_buffer + offset,
+                                             access_size);
+                        if (err)
+                                goto fail_idle;
+                }
+
+                err = nvgpu_vidmem_buf_access_memory(g, dmabuf, buffer,
+                                         args->offset + offset, access_size,
+                                         args->cmd);
+                if (err)
+                        goto fail_idle;
+
+                if (args->cmd ==
+                    NVGPU_DBG_GPU_IOCTL_ACCESS_FB_MEMORY_CMD_READ) {
+                        err = copy_to_user(user_buffer + offset,
+                                           buffer, access_size);
+                        if (err)
+                                goto fail_idle;
+                }
+
+                size -= access_size;
+                offset += access_size;
+        }
+        nvgpu_speculation_barrier();
+
+fail_idle:
+        gk20a_idle(g);
+fail_free_buffer:
+        nvgpu_big_free(g, buffer);
+fail_dmabuf_put:
+        dma_buf_put(dmabuf);
+
+        return err;
+}
+
+static int nvgpu_ioctl_profiler_reserve(struct dbg_session_gk20a *dbg_s,
+                           struct nvgpu_dbg_gpu_profiler_reserve_args *args)
+{
+        if (args->acquire)
+                return nvgpu_profiler_reserve_acquire(dbg_s, args->profiler_handle);
+
+        return nvgpu_profiler_reserve_release(dbg_s, args->profiler_handle);
+}
+
+static void nvgpu_dbg_gpu_ioctl_get_timeout(struct dbg_session_gk20a *dbg_s,
+                         struct nvgpu_dbg_gpu_timeout_args *args)
+{
+        bool status;
+        struct gk20a *g = dbg_s->g;
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        status = nvgpu_is_timeouts_enabled(g);
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        if (status)
+                args->enable = NVGPU_DBG_GPU_IOCTL_TIMEOUT_ENABLE;
+        else
+                args->enable = NVGPU_DBG_GPU_IOCTL_TIMEOUT_DISABLE;
+}
+
+static int gk20a_perfbuf_release_locked(struct gk20a *g, u64 offset)
+{
+        struct mm_gk20a *mm = &g->mm;
+        struct vm_gk20a *vm = mm->perfbuf.vm;
+        int err;
+
+        err = g->ops.dbg_session_ops.perfbuffer_disable(g);
+
+        nvgpu_vm_unmap(vm, offset, NULL);
+        nvgpu_free_inst_block(g, &mm->perfbuf.inst_block);
+        nvgpu_vm_put(vm);
+
+        g->perfbuf.owner = NULL;
+        g->perfbuf.offset = 0;
+        return err;
+}
+
+static int nvgpu_profiler_reserve_release(struct dbg_session_gk20a *dbg_s,
+                                                                u32 profiler_handle)
+{
+        struct gk20a *g = dbg_s->g;
+        struct dbg_profiler_object_data *prof_obj;
+        int err = 0;
+
+        nvgpu_log_fn(g, "%s profiler_handle = %x", g->name, profiler_handle);
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+
+        /* Find matching object. */
+        prof_obj = find_matching_prof_obj(dbg_s, profiler_handle);
+
+        if (!prof_obj) {
+                nvgpu_err(g, "object not found");
+                err = -EINVAL;
+                goto exit;
+        }
+
+        if (prof_obj->has_reservation)
+                g->ops.dbg_session_ops.release_profiler_reservation(dbg_s, prof_obj);
+        else {
+                nvgpu_err(g, "No reservation found");
+                err = -EINVAL;
+                goto exit;
+        }
+exit:
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+        return err;
+}
+
+static int nvgpu_profiler_reserve_acquire(struct dbg_session_gk20a *dbg_s,
+                                                                u32 profiler_handle)
+{
+        struct gk20a *g = dbg_s->g;
+        struct dbg_profiler_object_data *prof_obj, *my_prof_obj;
+        int err = 0;
+        struct tsg_gk20a *tsg;
+
+        nvgpu_log_fn(g, "%s profiler_handle = %x", g->name, profiler_handle);
+
+        if (g->profiler_reservation_count < 0) {
+                nvgpu_err(g, "Negative reservation count!");
+                return -EINVAL;
+        }
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+
+        /* Find matching object. */
+        my_prof_obj = find_matching_prof_obj(dbg_s, profiler_handle);
+
+        if (!my_prof_obj) {
+                nvgpu_err(g, "object not found");
+                err = -EINVAL;
+                goto exit;
+        }
+
+        /* If we already have the reservation, we're done */
+        if (my_prof_obj->has_reservation) {
+                err = 0;
+                goto exit;
+        }
+
+        if (my_prof_obj->ch == NULL) {
+                /* Global reservations are only allowed if there are no other
+                 * global or per-context reservations currently held
+                 */
+                if (!g->ops.dbg_session_ops.check_and_set_global_reservation(
+                                                        dbg_s, my_prof_obj)) {
+                        nvgpu_err(g,
+                                "global reserve: have existing reservation");
+                        err =  -EBUSY;
+                }
+        } else if (g->global_profiler_reservation_held) {
+                /* If there's a global reservation,
+                 * we can't take a per-context one.
+                 */
+                nvgpu_err(g,
+                        "per-ctxt reserve: global reservation in effect");
+                err = -EBUSY;
+        } else if ((tsg = tsg_gk20a_from_ch(my_prof_obj->ch)) != NULL) {
+                /* TSG: check that another channel in the TSG
+                 * doesn't already have the reservation
+                 */
+                u32 my_tsgid = tsg->tsgid;
+
+                nvgpu_list_for_each_entry(prof_obj, &g->profiler_objects,
+                                dbg_profiler_object_data, prof_obj_entry) {
+                        if (prof_obj->has_reservation &&
+                                        (prof_obj->ch->tsgid == my_tsgid)) {
+                                nvgpu_err(g,
+                                    "per-ctxt reserve (tsg): already reserved");
+                                err = -EBUSY;
+                                goto exit;
+                        }
+                }
+
+                if (!g->ops.dbg_session_ops.check_and_set_context_reservation(
+                                                        dbg_s, my_prof_obj)) {
+                        /* Another guest OS has the global reservation */
+                        nvgpu_err(g,
+                                "per-ctxt reserve: global reservation in effect");
+                        err = -EBUSY;
+                }
+        } else {
+                /* channel: check that some other profiler object doesn't
+                 * already have the reservation.
+                 */
+                struct channel_gk20a *my_ch = my_prof_obj->ch;
+
+                nvgpu_list_for_each_entry(prof_obj, &g->profiler_objects,
+                                dbg_profiler_object_data, prof_obj_entry) {
+                        if (prof_obj->has_reservation &&
+                                                (prof_obj->ch == my_ch)) {
+                                nvgpu_err(g,
+                                    "per-ctxt reserve (ch): already reserved");
+                                err = -EBUSY;
+                                goto exit;
+                        }
+                }
+
+                if (!g->ops.dbg_session_ops.check_and_set_context_reservation(
+                                                        dbg_s, my_prof_obj)) {
+                        /* Another guest OS has the global reservation */
+                        nvgpu_err(g,
+                                "per-ctxt reserve: global reservation in effect");
+                        err = -EBUSY;
+                }
+        }
+exit:
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+        return err;
+}
+
+static int dbg_unbind_channel_gk20a(struct dbg_session_gk20a *dbg_s,
+                          struct nvgpu_dbg_gpu_unbind_channel_args *args)
+{
+        struct dbg_session_channel_data *ch_data;
+        struct gk20a *g = dbg_s->g;
+        bool channel_found = false;
+        struct channel_gk20a *ch;
+        int err;
+
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_gpu_dbg, "%s fd=%d",
+                   g->name, args->channel_fd);
+
+        ch = gk20a_get_channel_from_file(args->channel_fd);
+        if (!ch) {
+                nvgpu_log_fn(g, "no channel found for fd");
+                return -EINVAL;
+        }
+
+        nvgpu_mutex_acquire(&dbg_s->ch_list_lock);
+        nvgpu_list_for_each_entry(ch_data, &dbg_s->ch_list,
+                                dbg_session_channel_data, ch_entry) {
+                if (ch->chid == ch_data->chid) {
+                        channel_found = true;
+                        break;
+                }
+        }
+        nvgpu_mutex_release(&dbg_s->ch_list_lock);
+
+        if (!channel_found) {
+                nvgpu_log_fn(g, "channel not bounded, fd=%d\n", args->channel_fd);
+                err = -EINVAL;
+                goto out;
+        }
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        nvgpu_mutex_acquire(&dbg_s->ch_list_lock);
+        err = dbg_unbind_single_channel_gk20a(dbg_s, ch_data);
+        nvgpu_mutex_release(&dbg_s->ch_list_lock);
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+out:
+        gk20a_channel_put(ch);
+        return err;
+}
+
+static int nvgpu_set_sm_exception_type_mask_locked(
+                                        struct dbg_session_gk20a *dbg_s,
+                                        u32 exception_mask)
+{
+        struct gk20a *g = dbg_s->g;
+        int err = 0;
+        struct channel_gk20a *ch = NULL;
+
+        /*
+         * Obtain the fisrt channel from the channel list in
+         * dbg_session, find the context associated with channel
+         * and set the sm_mask_type to that context
+         */
+        ch = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+        if (ch != NULL) {
+                struct tsg_gk20a *tsg;
+
+                tsg = tsg_gk20a_from_ch(ch);
+                if (tsg != NULL) {
+                        tsg->sm_exception_mask_type = exception_mask;
+                        goto type_mask_end;
+                }
+        }
+
+        nvgpu_log_fn(g, "unable to find the TSG\n");
+        err = -EINVAL;
+
+type_mask_end:
+        return err;
+}
+
+static int nvgpu_dbg_gpu_set_sm_exception_type_mask(
+                struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_set_sm_exception_type_mask_args *args)
+{
+        int err = 0;
+        struct gk20a *g = dbg_s->g;
+        u32 sm_exception_mask_type = NVGPU_SM_EXCEPTION_TYPE_MASK_NONE;
+
+        nvgpu_speculation_barrier();
+        switch (args->exception_type_mask) {
+        case NVGPU_DBG_GPU_IOCTL_SET_SM_EXCEPTION_TYPE_MASK_FATAL:
+                sm_exception_mask_type = NVGPU_SM_EXCEPTION_TYPE_MASK_FATAL;
+                break;
+        case NVGPU_DBG_GPU_IOCTL_SET_SM_EXCEPTION_TYPE_MASK_NONE:
+                sm_exception_mask_type = NVGPU_SM_EXCEPTION_TYPE_MASK_NONE;
+                break;
+        default:
+                nvgpu_err(g,
+                           "unrecognized dbg sm exception type mask: 0x%x",
+                           args->exception_type_mask);
+                err = -EINVAL;
+                break;
+        }
+
+        if (err != 0) {
+                return err;
+        }
+
+        nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+        err = nvgpu_set_sm_exception_type_mask_locked(dbg_s,
+                                        sm_exception_mask_type);
+        nvgpu_mutex_release(&g->dbg_sessions_lock);
+
+        return err;
+}
+
+#if defined(CONFIG_GK20A_CYCLE_STATS)
+static int nvgpu_dbg_gpu_cycle_stats(struct dbg_session_gk20a *dbg_s,
+                        struct nvgpu_dbg_gpu_cycle_stats_args *args)
+{
+        struct channel_gk20a *ch = NULL;
+        int err;
+
+        ch = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+        if (ch == NULL) {
+                return -EINVAL;
+        }
+
+        err = gk20a_busy(ch->g);
+        if (err != 0) {
+                return err;
+        }
+
+        err = gk20a_channel_cycle_stats(ch, args->dmabuf_fd);
+
+        gk20a_idle(ch->g);
+        return err;
+}
+
+static int nvgpu_dbg_gpu_cycle_stats_snapshot(struct dbg_session_gk20a *dbg_s,
+                struct nvgpu_dbg_gpu_cycle_stats_snapshot_args *args)
+{
+        struct channel_gk20a *ch = NULL;
+        int err;
+
+        if (!args->dmabuf_fd) {
+                return -EINVAL;
+        }
+
+        nvgpu_speculation_barrier();
+
+        ch = nvgpu_dbg_gpu_get_session_channel(dbg_s);
+        if (ch == NULL) {
+                return -EINVAL;
+        }
+
+        /* is it allowed to handle calls for current GPU? */
+        if (!nvgpu_is_enabled(ch->g, NVGPU_SUPPORT_CYCLE_STATS_SNAPSHOT)) {
+                return -ENOSYS;
+        }
+
+        err = gk20a_busy(ch->g);
+        if (err != 0) {
+                return err;
+        }
+
+        /* handle the command (most frequent cases first) */
+        switch (args->cmd) {
+        case NVGPU_DBG_GPU_IOCTL_CYCLE_STATS_SNAPSHOT_CMD_FLUSH:
+                err = gk20a_flush_cycle_stats_snapshot(ch);
+                args->extra = 0;
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_CYCLE_STATS_SNAPSHOT_CMD_ATTACH:
+                err = gk20a_attach_cycle_stats_snapshot(ch,
+                                                args->dmabuf_fd,
+                                                args->extra,
+                                                &args->extra);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_CYCLE_STATS_SNAPSHOT_CMD_DETACH:
+                err = gk20a_channel_free_cycle_stats_snapshot(ch);
+                args->extra = 0;
+                break;
+
+        default:
+                pr_err("cyclestats: unknown command %u\n", args->cmd);
+                err = -EINVAL;
+                break;
+        }
+
+        gk20a_idle(ch->g);
+        return err;
+}
+
+#endif
+
+int gk20a_dbg_gpu_dev_open(struct inode *inode, struct file *filp)
+{
+        struct nvgpu_os_linux *l = container_of(inode->i_cdev,
+                                 struct nvgpu_os_linux, dbg.cdev);
+        struct gk20a *g = &l->g;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_gpu_dbg, " ");
+        return gk20a_dbg_gpu_do_dev_open(inode, filp, false /* not profiler */);
+}
+
+long gk20a_dbg_gpu_dev_ioctl(struct file *filp, unsigned int cmd,
+                             unsigned long arg)
+{
+        struct dbg_session_gk20a_linux *dbg_s_linux = filp->private_data;
+        struct dbg_session_gk20a *dbg_s = &dbg_s_linux->dbg_s;
+        struct gk20a *g = dbg_s->g;
+        u8 buf[NVGPU_DBG_GPU_IOCTL_MAX_ARG_SIZE];
+        int err = 0;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_gpu_dbg, " ");
+
+        if ((_IOC_TYPE(cmd) != NVGPU_DBG_GPU_IOCTL_MAGIC) ||
+            (_IOC_NR(cmd) == 0) ||
+            (_IOC_NR(cmd) > NVGPU_DBG_GPU_IOCTL_LAST) ||
+            (_IOC_SIZE(cmd) > NVGPU_DBG_GPU_IOCTL_MAX_ARG_SIZE))
+                return -EINVAL;
+
+        memset(buf, 0, sizeof(buf));
+        if (_IOC_DIR(cmd) & _IOC_WRITE) {
+                if (copy_from_user(buf, (void __user *)arg, _IOC_SIZE(cmd)))
+                        return -EFAULT;
+        }
+
+        if (!g->sw_ready) {
+                err = gk20a_busy(g);
+                if (err)
+                        return err;
+
+                gk20a_idle(g);
+        }
+
+        /* protect from threaded user space calls */
+        nvgpu_mutex_acquire(&dbg_s->ioctl_lock);
+
+        nvgpu_speculation_barrier();
+        switch (cmd) {
+        case NVGPU_DBG_GPU_IOCTL_BIND_CHANNEL:
+                err = dbg_bind_channel_gk20a(dbg_s,
+                             (struct nvgpu_dbg_gpu_bind_channel_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_REG_OPS:
+                err = nvgpu_ioctl_channel_reg_ops(dbg_s,
+                           (struct nvgpu_dbg_gpu_exec_reg_ops_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_POWERGATE:
+                err = nvgpu_ioctl_powergate_gk20a(dbg_s,
+                           (struct nvgpu_dbg_gpu_powergate_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_EVENTS_CTRL:
+                err = gk20a_dbg_gpu_events_ctrl(dbg_s,
+                           (struct nvgpu_dbg_gpu_events_ctrl_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_SMPC_CTXSW_MODE:
+                err = nvgpu_dbg_gpu_ioctl_smpc_ctxsw_mode(dbg_s,
+                           (struct nvgpu_dbg_gpu_smpc_ctxsw_mode_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_HWPM_CTXSW_MODE:
+                err = nvgpu_dbg_gpu_ioctl_hwpm_ctxsw_mode(dbg_s,
+                           (struct nvgpu_dbg_gpu_hwpm_ctxsw_mode_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_SUSPEND_RESUME_ALL_SMS:
+                err = nvgpu_dbg_gpu_ioctl_suspend_resume_sm(dbg_s,
+                       (struct nvgpu_dbg_gpu_suspend_resume_all_sms_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_PERFBUF_MAP:
+                err = gk20a_perfbuf_map(dbg_s,
+                       (struct nvgpu_dbg_gpu_perfbuf_map_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_PERFBUF_UNMAP:
+                err = gk20a_perfbuf_unmap(dbg_s,
+                       (struct nvgpu_dbg_gpu_perfbuf_unmap_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_PC_SAMPLING:
+                err = gk20a_dbg_pc_sampling(dbg_s,
+                           (struct nvgpu_dbg_gpu_pc_sampling_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_SET_NEXT_STOP_TRIGGER_TYPE:
+                err = nvgpu_dbg_gpu_ioctl_set_next_stop_trigger_type(dbg_s,
+                       (struct nvgpu_dbg_gpu_set_next_stop_trigger_type_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_TIMEOUT:
+                err = nvgpu_dbg_gpu_ioctl_timeout(dbg_s,
+                           (struct nvgpu_dbg_gpu_timeout_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_GET_TIMEOUT:
+                nvgpu_dbg_gpu_ioctl_get_timeout(dbg_s,
+                           (struct nvgpu_dbg_gpu_timeout_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_READ_SINGLE_SM_ERROR_STATE:
+                err = nvgpu_dbg_gpu_ioctl_read_single_sm_error_state(dbg_s,
+                   (struct nvgpu_dbg_gpu_read_single_sm_error_state_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_CLEAR_SINGLE_SM_ERROR_STATE:
+                err = nvgpu_dbg_gpu_ioctl_clear_single_sm_error_state(dbg_s,
+                  (struct nvgpu_dbg_gpu_clear_single_sm_error_state_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_UNBIND_CHANNEL:
+                err = dbg_unbind_channel_gk20a(dbg_s,
+                             (struct nvgpu_dbg_gpu_unbind_channel_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_SUSPEND_RESUME_CONTEXTS:
+                err = nvgpu_dbg_gpu_ioctl_suspend_resume_contexts(dbg_s,
+                      (struct nvgpu_dbg_gpu_suspend_resume_contexts_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_ACCESS_FB_MEMORY:
+                err = nvgpu_dbg_gpu_ioctl_access_fb_memory(dbg_s,
+                        (struct nvgpu_dbg_gpu_access_fb_memory_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_PROFILER_ALLOCATE:
+                err = nvgpu_ioctl_allocate_profiler_object(dbg_s_linux,
+                        (struct nvgpu_dbg_gpu_profiler_obj_mgt_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_PROFILER_FREE:
+                err = nvgpu_ioctl_free_profiler_object(dbg_s_linux,
+                        (struct nvgpu_dbg_gpu_profiler_obj_mgt_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_PROFILER_RESERVE:
+                err = nvgpu_ioctl_profiler_reserve(dbg_s,
+                           (struct nvgpu_dbg_gpu_profiler_reserve_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_SET_SM_EXCEPTION_TYPE_MASK:
+                err = nvgpu_dbg_gpu_set_sm_exception_type_mask(dbg_s,
+                   (struct nvgpu_dbg_gpu_set_sm_exception_type_mask_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_SET_CTX_MMU_DEBUG_MODE:
+                err = nvgpu_dbg_gpu_ioctl_set_mmu_debug_mode(dbg_s,
+                   (struct nvgpu_dbg_gpu_set_ctx_mmu_debug_mode_args *)buf);
+                break;
+
+#ifdef CONFIG_GK20A_CYCLE_STATS
+        case NVGPU_DBG_GPU_IOCTL_CYCLE_STATS:
+                err = nvgpu_dbg_gpu_cycle_stats(dbg_s,
+                                (struct nvgpu_dbg_gpu_cycle_stats_args *)buf);
+                break;
+
+        case NVGPU_DBG_GPU_IOCTL_CYCLE_STATS_SNAPSHOT:
+                err = nvgpu_dbg_gpu_cycle_stats_snapshot(dbg_s,
+                                (struct nvgpu_dbg_gpu_cycle_stats_snapshot_args *)buf);
+                break;
+#endif
+
+        default:
+                nvgpu_err(g,
+                           "unrecognized dbg gpu ioctl cmd: 0x%x",
+                           cmd);
+                err = -ENOTTY;
+                break;
+        }
+
+        nvgpu_mutex_release(&dbg_s->ioctl_lock);
+
+        nvgpu_log(g, gpu_dbg_gpu_dbg, "ret=%d", err);
+
+        if ((err == 0) && (_IOC_DIR(cmd) & _IOC_READ))
+                err = copy_to_user((void __user *)arg,
+                                   buf, _IOC_SIZE(cmd));
+
+        return err;
+}
diff --git a/include/os/linux/ioctl_dbg.h b/include/os/linux/ioctl_dbg.h
new file mode 100644
index 0000000..2e188cc
--- /dev/null
+++ b/include/os/linux/ioctl_dbg.h
@@ -0,0 +1,38 @@
+/*
+ * Tegra GK20A GPU Debugger Driver
+ *
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef DBG_GPU_IOCTL_GK20A_H
+#define DBG_GPU_IOCTL_GK20A_H
+
+struct inode;
+struct file;
+typedef struct poll_table_struct poll_table;
+
+/* NVGPU_DBG_GPU_IOCTL_REG_OPS: the upper limit for the number
+ * of regops */
+#define NVGPU_IOCTL_DBG_REG_OPS_LIMIT 1024
+
+/* module debug driver interface */
+int gk20a_dbg_gpu_dev_release(struct inode *inode, struct file *filp);
+int gk20a_dbg_gpu_dev_open(struct inode *inode, struct file *filp);
+long gk20a_dbg_gpu_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+unsigned int gk20a_dbg_gpu_dev_poll(struct file *filep, poll_table *wait);
+
+/* used by profiler driver interface */
+int gk20a_prof_gpu_dev_open(struct inode *inode, struct file *filp);
+
+#endif
diff --git a/include/os/linux/ioctl_tsg.c b/include/os/linux/ioctl_tsg.c
new file mode 100644
index 0000000..2f8cb3a
--- /dev/null
+++ b/include/os/linux/ioctl_tsg.c
@@ -0,0 +1,750 @@
+/*
+ * Copyright (c) 2014-2020, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/cdev.h>
+#include <linux/uaccess.h>
+#include <linux/poll.h>
+#include <uapi/linux/nvgpu.h>
+#include <linux/anon_inodes.h>
+
+#include <nvgpu/kmem.h>
+#include <nvgpu/log.h>
+#include <nvgpu/os_sched.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/channel.h>
+#include <nvgpu/tsg.h>
+
+#include "gv11b/fifo_gv11b.h"
+#include "platform_gk20a.h"
+#include "ioctl_tsg.h"
+#include "ioctl_channel.h"
+#include "os_linux.h"
+
+struct tsg_private {
+        struct gk20a *g;
+        struct tsg_gk20a *tsg;
+};
+
+static int gk20a_tsg_bind_channel_fd(struct tsg_gk20a *tsg, int ch_fd)
+{
+        struct channel_gk20a *ch;
+        int err;
+
+        ch = gk20a_get_channel_from_file(ch_fd);
+        if (!ch)
+                return -EINVAL;
+
+        err = ch->g->ops.fifo.tsg_bind_channel(tsg, ch);
+
+        gk20a_channel_put(ch);
+        return err;
+}
+
+static int gk20a_tsg_ioctl_bind_channel_ex(struct gk20a *g,
+        struct tsg_gk20a *tsg, struct nvgpu_tsg_bind_channel_ex_args *arg)
+{
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+        struct channel_gk20a *ch;
+        struct gr_gk20a *gr = &g->gr;
+        int err = 0;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "tsgid=%u", tsg->tsgid);
+
+        nvgpu_mutex_acquire(&sched->control_lock);
+        if (sched->control_locked) {
+                err = -EPERM;
+                goto mutex_release;
+        }
+        err = gk20a_busy(g);
+        if (err) {
+                nvgpu_err(g, "failed to power on gpu");
+                goto mutex_release;
+        }
+
+        ch = gk20a_get_channel_from_file(arg->channel_fd);
+        if (!ch) {
+                err = -EINVAL;
+                goto idle;
+        }
+
+        if (arg->tpc_pg_enabled && (!tsg->tpc_num_initialized)) {
+                if ((arg->num_active_tpcs > gr->max_tpc_count) ||
+                                !(arg->num_active_tpcs)) {
+                        nvgpu_err(g, "Invalid num of active TPCs");
+                        err = -EINVAL;
+                        goto ch_put;
+                }
+                tsg->tpc_num_initialized = true;
+                tsg->num_active_tpcs = arg->num_active_tpcs;
+                tsg->tpc_pg_enabled = true;
+        } else {
+                tsg->tpc_pg_enabled = false; nvgpu_log(g, gpu_dbg_info, "dynamic TPC-PG not enabled");
+        }
+
+        if (arg->subcontext_id < g->fifo.max_subctx_count) {
+                ch->subctx_id = arg->subcontext_id;
+        } else {
+                err = -EINVAL;
+                goto ch_put;
+        }
+
+        nvgpu_log(g, gpu_dbg_info, "channel id : %d : subctx: %d",
+                                ch->chid, ch->subctx_id);
+
+        /* Use runqueue selector 1 for all ASYNC ids */
+        if (ch->subctx_id > CHANNEL_INFO_VEID0)
+                ch->runqueue_sel = 1;
+
+        err = ch->g->ops.fifo.tsg_bind_channel(tsg, ch);
+ch_put:
+        gk20a_channel_put(ch);
+idle:
+        gk20a_idle(g);
+mutex_release:
+        nvgpu_mutex_release(&sched->control_lock);
+        return err;
+}
+
+static int gk20a_tsg_unbind_channel_fd(struct tsg_gk20a *tsg, int ch_fd)
+{
+        struct channel_gk20a *ch;
+        int err = 0;
+
+        ch = gk20a_get_channel_from_file(ch_fd);
+        if (!ch)
+                return -EINVAL;
+
+        if (ch->tsgid != tsg->tsgid) {
+                err = -EINVAL;
+                goto out;
+        }
+
+        err = gk20a_tsg_unbind_channel(ch);
+
+        /*
+         * Mark the channel timedout since channel unbound from TSG
+         * has no context of its own so it can't serve any job
+         */
+        gk20a_channel_set_timedout(ch);
+
+out:
+        gk20a_channel_put(ch);
+        return err;
+}
+
+static int gk20a_tsg_get_event_data_from_id(struct tsg_gk20a *tsg,
+                                unsigned int event_id,
+                                struct gk20a_event_id_data **event_id_data)
+{
+        struct gk20a_event_id_data *local_event_id_data;
+        bool event_found = false;
+
+        nvgpu_mutex_acquire(&tsg->event_id_list_lock);
+        nvgpu_list_for_each_entry(local_event_id_data, &tsg->event_id_list,
+                                        gk20a_event_id_data, event_id_node) {
+                if (local_event_id_data->event_id == event_id) {
+                        event_found = true;
+                        break;
+                }
+        }
+        nvgpu_mutex_release(&tsg->event_id_list_lock);
+
+        if (event_found) {
+                *event_id_data = local_event_id_data;
+                return 0;
+        } else {
+                return -1;
+        }
+}
+
+/*
+ * Convert common event_id of the form NVGPU_EVENT_ID_* to Linux specific
+ * event_id of the form NVGPU_IOCTL_CHANNEL_EVENT_ID_* which is used in IOCTLs
+ */
+static u32 nvgpu_event_id_to_ioctl_channel_event_id(u32 event_id)
+{
+        switch (event_id) {
+        case NVGPU_EVENT_ID_BPT_INT:
+                return NVGPU_IOCTL_CHANNEL_EVENT_ID_BPT_INT;
+        case NVGPU_EVENT_ID_BPT_PAUSE:
+                return NVGPU_IOCTL_CHANNEL_EVENT_ID_BPT_PAUSE;
+        case NVGPU_EVENT_ID_BLOCKING_SYNC:
+                return NVGPU_IOCTL_CHANNEL_EVENT_ID_BLOCKING_SYNC;
+        case NVGPU_EVENT_ID_CILP_PREEMPTION_STARTED:
+                return NVGPU_IOCTL_CHANNEL_EVENT_ID_CILP_PREEMPTION_STARTED;
+        case NVGPU_EVENT_ID_CILP_PREEMPTION_COMPLETE:
+                return NVGPU_IOCTL_CHANNEL_EVENT_ID_CILP_PREEMPTION_COMPLETE;
+        case NVGPU_EVENT_ID_GR_SEMAPHORE_WRITE_AWAKEN:
+                return NVGPU_IOCTL_CHANNEL_EVENT_ID_GR_SEMAPHORE_WRITE_AWAKEN;
+        }
+
+        return NVGPU_IOCTL_CHANNEL_EVENT_ID_MAX;
+}
+
+void gk20a_tsg_event_id_post_event(struct tsg_gk20a *tsg,
+                                       int __event_id)
+{
+        struct gk20a_event_id_data *event_id_data;
+        u32 event_id;
+        int err = 0;
+        struct gk20a *g = tsg->g;
+
+        event_id = nvgpu_event_id_to_ioctl_channel_event_id(__event_id);
+        if (event_id >= NVGPU_IOCTL_CHANNEL_EVENT_ID_MAX)
+                return;
+
+        err = gk20a_tsg_get_event_data_from_id(tsg, event_id,
+                                                &event_id_data);
+        if (err)
+                return;
+
+        nvgpu_mutex_acquire(&event_id_data->lock);
+
+        nvgpu_log_info(g,
+                "posting event for event_id=%d on tsg=%d\n",
+                event_id, tsg->tsgid);
+        event_id_data->event_posted = true;
+
+        nvgpu_cond_broadcast_interruptible(&event_id_data->event_id_wq);
+
+        nvgpu_mutex_release(&event_id_data->lock);
+}
+
+static unsigned int gk20a_event_id_poll(struct file *filep, poll_table *wait)
+{
+        unsigned int mask = 0;
+        struct gk20a_event_id_data *event_id_data = filep->private_data;
+        struct gk20a *g = event_id_data->g;
+        u32 event_id = event_id_data->event_id;
+        struct tsg_gk20a *tsg = g->fifo.tsg + event_id_data->id;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_info, " ");
+
+        poll_wait(filep, &event_id_data->event_id_wq.wq, wait);
+
+        nvgpu_mutex_acquire(&event_id_data->lock);
+
+        if (event_id_data->event_posted) {
+                nvgpu_log_info(g,
+                        "found pending event_id=%d on TSG=%d\n",
+                        event_id, tsg->tsgid);
+                mask = (POLLPRI | POLLIN);
+                event_id_data->event_posted = false;
+        }
+
+        nvgpu_mutex_release(&event_id_data->lock);
+
+        return mask;
+}
+
+static int gk20a_event_id_release(struct inode *inode, struct file *filp)
+{
+        struct gk20a_event_id_data *event_id_data = filp->private_data;
+        struct gk20a *g = event_id_data->g;
+        struct tsg_gk20a *tsg = g->fifo.tsg + event_id_data->id;
+
+        nvgpu_mutex_acquire(&tsg->event_id_list_lock);
+        nvgpu_list_del(&event_id_data->event_id_node);
+        nvgpu_mutex_release(&tsg->event_id_list_lock);
+
+        nvgpu_mutex_destroy(&event_id_data->lock);
+        gk20a_put(g);
+        nvgpu_kfree(g, event_id_data);
+        filp->private_data = NULL;
+
+        return 0;
+}
+
+const struct file_operations gk20a_event_id_ops = {
+        .owner = THIS_MODULE,
+        .poll = gk20a_event_id_poll,
+        .release = gk20a_event_id_release,
+};
+
+static int gk20a_tsg_event_id_enable(struct tsg_gk20a *tsg,
+                                         int event_id,
+                                         int *fd)
+{
+        int err = 0;
+        int local_fd;
+        struct file *file;
+        char name[64];
+        struct gk20a_event_id_data *event_id_data;
+        struct gk20a *g;
+
+        g = gk20a_get(tsg->g);
+        if (!g)
+                return -ENODEV;
+
+        err = gk20a_tsg_get_event_data_from_id(tsg,
+                                event_id, &event_id_data);
+        if (err == 0) {
+                /* We already have event enabled */
+                err = -EINVAL;
+                goto free_ref;
+        }
+
+        err = get_unused_fd_flags(O_RDWR);
+        if (err < 0)
+                goto free_ref;
+        local_fd = err;
+
+        snprintf(name, sizeof(name), "nvgpu-event%d-fd%d",
+                 event_id, local_fd);
+
+        file = anon_inode_getfile(name, &gk20a_event_id_ops,
+                                  NULL, O_RDWR);
+        if (IS_ERR(file)) {
+                err = PTR_ERR(file);
+                goto clean_up;
+        }
+
+        event_id_data = nvgpu_kzalloc(tsg->g, sizeof(*event_id_data));
+        if (!event_id_data) {
+                err = -ENOMEM;
+                goto clean_up_file;
+        }
+        event_id_data->g = g;
+        event_id_data->id = tsg->tsgid;
+        event_id_data->event_id = event_id;
+
+        nvgpu_cond_init(&event_id_data->event_id_wq);
+        err = nvgpu_mutex_init(&event_id_data->lock);
+        if (err)
+                goto clean_up_free;
+
+        nvgpu_init_list_node(&event_id_data->event_id_node);
+
+        nvgpu_mutex_acquire(&tsg->event_id_list_lock);
+        nvgpu_list_add_tail(&event_id_data->event_id_node, &tsg->event_id_list);
+        nvgpu_mutex_release(&tsg->event_id_list_lock);
+
+        fd_install(local_fd, file);
+        file->private_data = event_id_data;
+
+        *fd = local_fd;
+
+        return 0;
+
+clean_up_free:
+        nvgpu_kfree(g, event_id_data);
+clean_up_file:
+        fput(file);
+clean_up:
+        put_unused_fd(local_fd);
+free_ref:
+        gk20a_put(g);
+        return err;
+}
+
+static int gk20a_tsg_event_id_ctrl(struct gk20a *g, struct tsg_gk20a *tsg,
+                struct nvgpu_event_id_ctrl_args *args)
+{
+        int err = 0;
+        int fd = -1;
+
+        if (args->event_id >= NVGPU_IOCTL_CHANNEL_EVENT_ID_MAX)
+                return -EINVAL;
+
+        nvgpu_speculation_barrier();
+        switch (args->cmd) {
+        case NVGPU_IOCTL_CHANNEL_EVENT_ID_CMD_ENABLE:
+                err = gk20a_tsg_event_id_enable(tsg, args->event_id, &fd);
+                if (!err)
+                        args->event_fd = fd;
+                break;
+
+        default:
+                nvgpu_err(tsg->g, "unrecognized tsg event id cmd: 0x%x",
+                           args->cmd);
+                err = -EINVAL;
+                break;
+        }
+
+        return err;
+}
+
+int nvgpu_ioctl_tsg_open(struct gk20a *g, struct file *filp)
+{
+        struct tsg_private *priv;
+        struct tsg_gk20a *tsg;
+        struct device *dev;
+        int err;
+
+        g = gk20a_get(g);
+        if (!g)
+                return -ENODEV;
+
+        dev  = dev_from_gk20a(g);
+
+        nvgpu_log(g, gpu_dbg_fn, "tsg: %s", dev_name(dev));
+
+        priv = nvgpu_kmalloc(g, sizeof(*priv));
+        if (!priv) {
+                err = -ENOMEM;
+                goto free_ref;
+        }
+
+        err = gk20a_busy(g);
+        if (err) {
+                nvgpu_err(g, "failed to power on, %d", err);
+                goto free_mem;
+        }
+
+        tsg = gk20a_tsg_open(g, nvgpu_current_pid(g));
+        gk20a_idle(g);
+        if (!tsg) {
+                err = -ENOMEM;
+                goto free_mem;
+        }
+
+        priv->g = g;
+        priv->tsg = tsg;
+        filp->private_data = priv;
+
+        gk20a_sched_ctrl_tsg_added(g, tsg);
+
+        return 0;
+
+free_mem:
+        nvgpu_kfree(g, priv);
+free_ref:
+        gk20a_put(g);
+        return err;
+}
+
+int nvgpu_ioctl_tsg_dev_open(struct inode *inode, struct file *filp)
+{
+        struct nvgpu_os_linux *l;
+        struct gk20a *g;
+        int ret;
+
+        l = container_of(inode->i_cdev,
+                         struct nvgpu_os_linux, tsg.cdev);
+        g = &l->g;
+
+        nvgpu_log_fn(g, " ");
+
+        ret = gk20a_busy(g);
+        if (ret) {
+                nvgpu_err(g, "failed to power on, %d", ret);
+                return ret;
+        }
+
+        ret = nvgpu_ioctl_tsg_open(&l->g, filp);
+
+        gk20a_idle(g);
+        nvgpu_log_fn(g, "done");
+        return ret;
+}
+
+void nvgpu_ioctl_tsg_release(struct nvgpu_ref *ref)
+{
+        struct tsg_gk20a *tsg = container_of(ref, struct tsg_gk20a, refcount);
+        struct gk20a *g = tsg->g;
+
+        gk20a_sched_ctrl_tsg_removed(g, tsg);
+
+        gk20a_tsg_release(ref);
+        gk20a_put(g);
+}
+
+int nvgpu_ioctl_tsg_dev_release(struct inode *inode, struct file *filp)
+{
+        struct tsg_private *priv = filp->private_data;
+        struct tsg_gk20a *tsg;
+
+        if (!priv) {
+                /* open failed, never got a tsg for this file */
+                return 0;
+        }
+
+        tsg = priv->tsg;
+
+        nvgpu_ref_put(&tsg->refcount, nvgpu_ioctl_tsg_release);
+        nvgpu_kfree(tsg->g, priv);
+        return 0;
+}
+
+static int gk20a_tsg_ioctl_set_runlist_interleave(struct gk20a *g,
+        struct tsg_gk20a *tsg, struct nvgpu_runlist_interleave_args *arg)
+{
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+        u32 level = arg->level;
+        int err;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "tsgid=%u", tsg->tsgid);
+
+        nvgpu_mutex_acquire(&sched->control_lock);
+        if (sched->control_locked) {
+                err = -EPERM;
+                goto done;
+        }
+        err = gk20a_busy(g);
+        if (err) {
+                nvgpu_err(g, "failed to power on gpu");
+                goto done;
+        }
+
+        level = nvgpu_get_common_runlist_level(level);
+        err = gk20a_tsg_set_runlist_interleave(tsg, level);
+
+        gk20a_idle(g);
+done:
+        nvgpu_mutex_release(&sched->control_lock);
+        return err;
+}
+
+static int gk20a_tsg_ioctl_set_timeslice(struct gk20a *g,
+        struct tsg_gk20a *tsg, struct nvgpu_timeslice_args *arg)
+{
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+        int err;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "tsgid=%u", tsg->tsgid);
+
+        nvgpu_mutex_acquire(&sched->control_lock);
+        if (sched->control_locked) {
+                err = -EPERM;
+                goto done;
+        }
+        err = gk20a_busy(g);
+        if (err) {
+                nvgpu_err(g, "failed to power on gpu");
+                goto done;
+        }
+        err = gk20a_tsg_set_timeslice(tsg, arg->timeslice_us);
+        gk20a_idle(g);
+done:
+        nvgpu_mutex_release(&sched->control_lock);
+        return err;
+}
+
+static int gk20a_tsg_ioctl_get_timeslice(struct gk20a *g,
+        struct tsg_gk20a *tsg, struct nvgpu_timeslice_args *arg)
+{
+        arg->timeslice_us = gk20a_tsg_get_timeslice(tsg);
+        return 0;
+}
+
+static int gk20a_tsg_ioctl_read_single_sm_error_state(struct gk20a *g,
+                struct tsg_gk20a *tsg,
+                struct nvgpu_tsg_read_single_sm_error_state_args *args)
+{
+        struct gr_gk20a *gr = &g->gr;
+        struct nvgpu_tsg_sm_error_state *sm_error_state;
+        struct nvgpu_tsg_sm_error_state_record sm_error_state_record;
+        u32 sm_id;
+        int err = 0;
+
+        sm_id = args->sm_id;
+        if (sm_id >= gr->no_of_sm)
+                return -EINVAL;
+
+        nvgpu_speculation_barrier();
+
+        sm_error_state = tsg->sm_error_states + sm_id;
+        sm_error_state_record.global_esr =
+                sm_error_state->hww_global_esr;
+        sm_error_state_record.warp_esr =
+                sm_error_state->hww_warp_esr;
+        sm_error_state_record.warp_esr_pc =
+                sm_error_state->hww_warp_esr_pc;
+        sm_error_state_record.global_esr_report_mask =
+                sm_error_state->hww_global_esr_report_mask;
+        sm_error_state_record.warp_esr_report_mask =
+                sm_error_state->hww_warp_esr_report_mask;
+
+        if (args->record_size > 0) {
+                size_t write_size = sizeof(*sm_error_state);
+
+                nvgpu_speculation_barrier();
+                if (write_size > args->record_size)
+                        write_size = args->record_size;
+
+                nvgpu_mutex_acquire(&g->dbg_sessions_lock);
+                err = copy_to_user((void __user *)(uintptr_t)
+                                                args->record_mem,
+                                   &sm_error_state_record,
+                                   write_size);
+                nvgpu_mutex_release(&g->dbg_sessions_lock);
+                if (err) {
+                        nvgpu_err(g, "copy_to_user failed!");
+                        return err;
+                }
+
+                args->record_size = write_size;
+        }
+
+        return 0;
+}
+
+long nvgpu_ioctl_tsg_dev_ioctl(struct file *filp, unsigned int cmd,
+                             unsigned long arg)
+{
+        struct tsg_private *priv = filp->private_data;
+        struct tsg_gk20a *tsg = priv->tsg;
+        struct gk20a *g = tsg->g;
+        u8 __maybe_unused buf[NVGPU_TSG_IOCTL_MAX_ARG_SIZE];
+        int err = 0;
+
+        nvgpu_log_fn(g, "start %d", _IOC_NR(cmd));
+
+        if ((_IOC_TYPE(cmd) != NVGPU_TSG_IOCTL_MAGIC) ||
+            (_IOC_NR(cmd) == 0) ||
+            (_IOC_NR(cmd) > NVGPU_TSG_IOCTL_LAST) ||
+            (_IOC_SIZE(cmd) > NVGPU_TSG_IOCTL_MAX_ARG_SIZE))
+                return -EINVAL;
+
+        memset(buf, 0, sizeof(buf));
+        if (_IOC_DIR(cmd) & _IOC_WRITE) {
+                if (copy_from_user(buf, (void __user *)arg, _IOC_SIZE(cmd)))
+                        return -EFAULT;
+        }
+
+        if (!g->sw_ready) {
+                err = gk20a_busy(g);
+                if (err)
+                        return err;
+
+                gk20a_idle(g);
+        }
+
+        switch (cmd) {
+        case NVGPU_TSG_IOCTL_BIND_CHANNEL:
+                {
+                int ch_fd = *(int *)buf;
+                if (ch_fd < 0) {
+                        err = -EINVAL;
+                        break;
+                }
+                err = gk20a_tsg_bind_channel_fd(tsg, ch_fd);
+                break;
+                }
+
+        case NVGPU_TSG_IOCTL_BIND_CHANNEL_EX:
+        {
+                err = gk20a_tsg_ioctl_bind_channel_ex(g, tsg,
+                        (struct nvgpu_tsg_bind_channel_ex_args *)buf);
+                break;
+        }
+
+        case NVGPU_TSG_IOCTL_UNBIND_CHANNEL:
+                {
+                int ch_fd = *(int *)buf;
+
+                if (ch_fd < 0) {
+                        err = -EINVAL;
+                        break;
+                }
+                err = gk20a_busy(g);
+                if (err) {
+                        nvgpu_err(g,
+                           "failed to host gk20a for ioctl cmd: 0x%x", cmd);
+                        break;
+                }
+                err = gk20a_tsg_unbind_channel_fd(tsg, ch_fd);
+                gk20a_idle(g);
+                break;
+                }
+
+        case NVGPU_IOCTL_TSG_ENABLE:
+                {
+                err = gk20a_busy(g);
+                if (err) {
+                        nvgpu_err(g,
+                           "failed to host gk20a for ioctl cmd: 0x%x", cmd);
+                        return err;
+                }
+                g->ops.fifo.enable_tsg(tsg);
+                gk20a_idle(g);
+                break;
+                }
+
+        case NVGPU_IOCTL_TSG_DISABLE:
+                {
+                err = gk20a_busy(g);
+                if (err) {
+                        nvgpu_err(g,
+                           "failed to host gk20a for ioctl cmd: 0x%x", cmd);
+                        return err;
+                }
+                g->ops.fifo.disable_tsg(tsg);
+                gk20a_idle(g);
+                break;
+                }
+
+        case NVGPU_IOCTL_TSG_PREEMPT:
+                {
+                err = gk20a_busy(g);
+                if (err) {
+                        nvgpu_err(g,
+                           "failed to host gk20a for ioctl cmd: 0x%x", cmd);
+                        return err;
+                }
+                /* preempt TSG */
+                err = g->ops.fifo.preempt_tsg(g, tsg);
+                gk20a_idle(g);
+                break;
+                }
+
+        case NVGPU_IOCTL_TSG_EVENT_ID_CTRL:
+                {
+                err = gk20a_tsg_event_id_ctrl(g, tsg,
+                        (struct nvgpu_event_id_ctrl_args *)buf);
+                break;
+                }
+
+        case NVGPU_IOCTL_TSG_SET_RUNLIST_INTERLEAVE:
+                err = gk20a_tsg_ioctl_set_runlist_interleave(g, tsg,
+                        (struct nvgpu_runlist_interleave_args *)buf);
+                break;
+
+        case NVGPU_IOCTL_TSG_SET_TIMESLICE:
+                {
+                err = gk20a_tsg_ioctl_set_timeslice(g, tsg,
+                        (struct nvgpu_timeslice_args *)buf);
+                break;
+                }
+        case NVGPU_IOCTL_TSG_GET_TIMESLICE:
+                {
+                err = gk20a_tsg_ioctl_get_timeslice(g, tsg,
+                        (struct nvgpu_timeslice_args *)buf);
+                break;
+                }
+
+        case NVGPU_TSG_IOCTL_READ_SINGLE_SM_ERROR_STATE:
+                {
+                err = gk20a_tsg_ioctl_read_single_sm_error_state(g, tsg,
+                        (struct nvgpu_tsg_read_single_sm_error_state_args *)buf);
+                break;
+                }
+
+        default:
+                nvgpu_err(g, "unrecognized tsg gpu ioctl cmd: 0x%x",
+                           cmd);
+                err = -ENOTTY;
+                break;
+        }
+
+        if ((err == 0) && (_IOC_DIR(cmd) & _IOC_READ))
+                err = copy_to_user((void __user *)arg,
+                                   buf, _IOC_SIZE(cmd));
+
+        return err;
+}
diff --git a/include/os/linux/ioctl_tsg.h b/include/os/linux/ioctl_tsg.h
new file mode 100644
index 0000000..67399fd
--- /dev/null
+++ b/include/os/linux/ioctl_tsg.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+#ifndef NVGPU_IOCTL_TSG_H
+#define NVGPU_IOCTL_TSG_H
+
+struct inode;
+struct file;
+struct gk20a;
+struct nvgpu_ref;
+
+int nvgpu_ioctl_tsg_dev_release(struct inode *inode, struct file *filp);
+int nvgpu_ioctl_tsg_dev_open(struct inode *inode, struct file *filp);
+int nvgpu_ioctl_tsg_open(struct gk20a *g, struct file *filp);
+long nvgpu_ioctl_tsg_dev_ioctl(struct file *filp,
+                               unsigned int cmd, unsigned long arg);
+void nvgpu_ioctl_tsg_release(struct nvgpu_ref *ref);
+
+#endif
diff --git a/include/os/linux/kmem.c b/include/os/linux/kmem.c
new file mode 100644
index 0000000..395cc45
--- /dev/null
+++ b/include/os/linux/kmem.c
@@ -0,0 +1,653 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/vmalloc.h>
+#include <linux/stacktrace.h>
+
+#include <nvgpu/lock.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/atomic.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/gk20a.h>
+
+#include "kmem_priv.h"
+
+/*
+ * Statically declared because this needs to be shared across all nvgpu driver
+ * instances. This makes sure that all kmem caches are _definitely_ uniquely
+ * named.
+ */
+static atomic_t kmem_cache_id;
+
+void *__nvgpu_big_alloc(struct gk20a *g, size_t size, bool clear)
+{
+        void *p;
+
+        if (size > PAGE_SIZE) {
+                if (clear)
+                        p = nvgpu_vzalloc(g, size);
+                else
+                        p = nvgpu_vmalloc(g, size);
+        } else {
+                if (clear)
+                        p = nvgpu_kzalloc(g, size);
+                else
+                        p = nvgpu_kmalloc(g, size);
+        }
+
+        return p;
+}
+
+void nvgpu_big_free(struct gk20a *g, void *p)
+{
+        /*
+         * This will have to be fixed eventually. Allocs that use
+         * nvgpu_big_[mz]alloc() will need to remember the size of the alloc
+         * when freeing.
+         */
+        if (is_vmalloc_addr(p))
+                nvgpu_vfree(g, p);
+        else
+                nvgpu_kfree(g, p);
+}
+
+void *__nvgpu_kmalloc(struct gk20a *g, size_t size, void *ip)
+{
+        void *alloc;
+
+#ifdef CONFIG_NVGPU_TRACK_MEM_USAGE
+        alloc = __nvgpu_track_kmalloc(g, size, ip);
+#else
+        alloc = kmalloc(size, GFP_KERNEL);
+#endif
+
+        kmem_dbg(g, "kmalloc: size=%-6ld addr=0x%p gfp=0x%08x",
+                 size, alloc, GFP_KERNEL);
+
+        return alloc;
+}
+
+void *__nvgpu_kzalloc(struct gk20a *g, size_t size, void *ip)
+{
+        void *alloc;
+
+#ifdef CONFIG_NVGPU_TRACK_MEM_USAGE
+        alloc = __nvgpu_track_kzalloc(g, size, ip);
+#else
+        alloc = kzalloc(size, GFP_KERNEL);
+#endif
+
+        kmem_dbg(g, "kzalloc: size=%-6ld addr=0x%p gfp=0x%08x",
+                 size, alloc, GFP_KERNEL);
+
+        return alloc;
+}
+
+void *__nvgpu_kcalloc(struct gk20a *g, size_t n, size_t size, void *ip)
+{
+        void *alloc;
+
+#ifdef CONFIG_NVGPU_TRACK_MEM_USAGE
+        alloc = __nvgpu_track_kcalloc(g, n, size, ip);
+#else
+        alloc = kcalloc(n, size, GFP_KERNEL);
+#endif
+
+        kmem_dbg(g, "kcalloc: size=%-6ld addr=0x%p gfp=0x%08x",
+                 n * size, alloc, GFP_KERNEL);
+
+        return alloc;
+}
+
+void *__nvgpu_vmalloc(struct gk20a *g, unsigned long size, void *ip)
+{
+        void *alloc;
+
+#ifdef CONFIG_NVGPU_TRACK_MEM_USAGE
+        alloc = __nvgpu_track_vmalloc(g, size, ip);
+#else
+        alloc = vmalloc(size);
+#endif
+
+        kmem_dbg(g, "vmalloc: size=%-6ld addr=0x%p", size, alloc);
+
+        return alloc;
+}
+
+void *__nvgpu_vzalloc(struct gk20a *g, unsigned long size, void *ip)
+{
+        void *alloc;
+
+#ifdef CONFIG_NVGPU_TRACK_MEM_USAGE
+        alloc = __nvgpu_track_vzalloc(g, size, ip);
+#else
+        alloc = vzalloc(size);
+#endif
+
+        kmem_dbg(g, "vzalloc: size=%-6ld addr=0x%p", size, alloc);
+
+        return alloc;
+}
+
+void __nvgpu_kfree(struct gk20a *g, void *addr)
+{
+        kmem_dbg(g, "kfree: addr=0x%p", addr);
+#ifdef CONFIG_NVGPU_TRACK_MEM_USAGE
+        __nvgpu_track_kfree(g, addr);
+#else
+        kfree(addr);
+#endif
+}
+
+void __nvgpu_vfree(struct gk20a *g, void *addr)
+{
+        kmem_dbg(g, "vfree: addr=0x%p", addr);
+#ifdef CONFIG_NVGPU_TRACK_MEM_USAGE
+        __nvgpu_track_vfree(g, addr);
+#else
+        vfree(addr);
+#endif
+}
+
+#ifdef CONFIG_NVGPU_TRACK_MEM_USAGE
+
+void nvgpu_lock_tracker(struct nvgpu_mem_alloc_tracker *tracker)
+{
+        nvgpu_mutex_acquire(&tracker->lock);
+}
+
+void nvgpu_unlock_tracker(struct nvgpu_mem_alloc_tracker *tracker)
+{
+        nvgpu_mutex_release(&tracker->lock);
+}
+
+void kmem_print_mem_alloc(struct gk20a *g,
+                         struct nvgpu_mem_alloc *alloc,
+                         struct seq_file *s)
+{
+#ifdef __NVGPU_SAVE_KALLOC_STACK_TRACES
+        int i;
+
+        __pstat(s, "nvgpu-alloc: addr=0x%llx size=%ld\n",
+                alloc->addr, alloc->size);
+        for (i = 0; i < alloc->stack_length; i++)
+                __pstat(s, "  %3d [<%p>] %pS\n", i,
+                        (void *)alloc->stack[i],
+                        (void *)alloc->stack[i]);
+        __pstat(s, "\n");
+#else
+        __pstat(s, "nvgpu-alloc: addr=0x%llx size=%ld src=%pF\n",
+                alloc->addr, alloc->size, alloc->ip);
+#endif
+}
+
+static int nvgpu_add_alloc(struct nvgpu_mem_alloc_tracker *tracker,
+                           struct nvgpu_mem_alloc *alloc)
+{
+        alloc->allocs_entry.key_start = alloc->addr;
+        alloc->allocs_entry.key_end = alloc->addr + alloc->size;
+
+        nvgpu_rbtree_insert(&alloc->allocs_entry, &tracker->allocs);
+        return 0;
+}
+
+static struct nvgpu_mem_alloc *nvgpu_rem_alloc(
+        struct nvgpu_mem_alloc_tracker *tracker, u64 alloc_addr)
+{
+        struct nvgpu_mem_alloc *alloc;
+        struct nvgpu_rbtree_node *node = NULL;
+
+        nvgpu_rbtree_search(alloc_addr, &node, tracker->allocs);
+        if (!node)
+                return NULL;
+
+        alloc = nvgpu_mem_alloc_from_rbtree_node(node);
+
+        nvgpu_rbtree_unlink(node, &tracker->allocs);
+
+        return alloc;
+}
+
+static int __nvgpu_save_kmem_alloc(struct nvgpu_mem_alloc_tracker *tracker,
+                                   unsigned long size, unsigned long real_size,
+                                   u64 addr, void *ip)
+{
+        int ret;
+        struct nvgpu_mem_alloc *alloc;
+#ifdef __NVGPU_SAVE_KALLOC_STACK_TRACES
+        struct stack_trace stack_trace;
+#endif
+
+        alloc = kzalloc(sizeof(*alloc), GFP_KERNEL);
+        if (!alloc)
+                return -ENOMEM;
+
+        alloc->owner = tracker;
+        alloc->size = size;
+        alloc->real_size = real_size;
+        alloc->addr = addr;
+        alloc->ip = ip;
+
+#ifdef __NVGPU_SAVE_KALLOC_STACK_TRACES
+        stack_trace.max_entries = MAX_STACK_TRACE;
+        stack_trace.nr_entries = 0;
+        stack_trace.entries = alloc->stack;
+        /*
+         * This 4 here skips the 2 function calls that happen for all traced
+         * allocs due to nvgpu:
+         *
+         *   __nvgpu_save_kmem_alloc+0x7c/0x128
+         *   __nvgpu_track_kzalloc+0xcc/0xf8
+         *
+         * And the function calls that get made by the stack trace code itself.
+         * If the trace savings code changes this will likely have to change
+         * as well.
+         */
+        stack_trace.skip = 4;
+        save_stack_trace(&stack_trace);
+        alloc->stack_length = stack_trace.nr_entries;
+#endif
+
+        nvgpu_lock_tracker(tracker);
+        tracker->bytes_alloced += size;
+        tracker->bytes_alloced_real += real_size;
+        tracker->nr_allocs++;
+
+        /* Keep track of this for building a histogram later on. */
+        if (tracker->max_alloc < size)
+                tracker->max_alloc = size;
+        if (tracker->min_alloc > size)
+                tracker->min_alloc = size;
+
+        ret = nvgpu_add_alloc(tracker, alloc);
+        if (ret) {
+                WARN(1, "Duplicate alloc??? 0x%llx\n", addr);
+                kfree(alloc);
+                nvgpu_unlock_tracker(tracker);
+                return ret;
+        }
+        nvgpu_unlock_tracker(tracker);
+
+        return 0;
+}
+
+static int __nvgpu_free_kmem_alloc(struct nvgpu_mem_alloc_tracker *tracker,
+                                   u64 addr)
+{
+        struct nvgpu_mem_alloc *alloc;
+
+        nvgpu_lock_tracker(tracker);
+        alloc = nvgpu_rem_alloc(tracker, addr);
+        if (WARN(!alloc, "Possible double-free detected: 0x%llx!", addr)) {
+                nvgpu_unlock_tracker(tracker);
+                return -EINVAL;
+        }
+
+        memset((void *)alloc->addr, 0, alloc->size);
+
+        tracker->nr_frees++;
+        tracker->bytes_freed += alloc->size;
+        tracker->bytes_freed_real += alloc->real_size;
+        nvgpu_unlock_tracker(tracker);
+
+        return 0;
+}
+
+static void __nvgpu_check_valloc_size(unsigned long size)
+{
+        WARN(size < PAGE_SIZE, "Alloc smaller than page size! (%lu)!\n", size);
+}
+
+static void __nvgpu_check_kalloc_size(size_t size)
+{
+        WARN(size > PAGE_SIZE, "Alloc larger than page size! (%zu)!\n", size);
+}
+
+void *__nvgpu_track_vmalloc(struct gk20a *g, unsigned long size,
+                            void *ip)
+{
+        void *alloc = vmalloc(size);
+
+        if (!alloc)
+                return NULL;
+
+        __nvgpu_check_valloc_size(size);
+
+        /*
+         * Ignore the return message. If this fails let's not cause any issues
+         * for the rest of the driver.
+         */
+        __nvgpu_save_kmem_alloc(g->vmallocs, size, roundup_pow_of_two(size),
+                                (u64)(uintptr_t)alloc, ip);
+
+        return alloc;
+}
+
+void *__nvgpu_track_vzalloc(struct gk20a *g, unsigned long size,
+                            void *ip)
+{
+        void *alloc = vzalloc(size);
+
+        if (!alloc)
+                return NULL;
+
+        __nvgpu_check_valloc_size(size);
+
+        /*
+         * Ignore the return message. If this fails let's not cause any issues
+         * for the rest of the driver.
+         */
+        __nvgpu_save_kmem_alloc(g->vmallocs, size, roundup_pow_of_two(size),
+                                (u64)(uintptr_t)alloc, ip);
+
+        return alloc;
+}
+
+void *__nvgpu_track_kmalloc(struct gk20a *g, size_t size, void *ip)
+{
+        void *alloc = kmalloc(size, GFP_KERNEL);
+
+        if (!alloc)
+                return NULL;
+
+        __nvgpu_check_kalloc_size(size);
+
+        __nvgpu_save_kmem_alloc(g->kmallocs, size, roundup_pow_of_two(size),
+                                (u64)(uintptr_t)alloc, ip);
+
+        return alloc;
+}
+
+void *__nvgpu_track_kzalloc(struct gk20a *g, size_t size, void *ip)
+{
+        void *alloc = kzalloc(size, GFP_KERNEL);
+
+        if (!alloc)
+                return NULL;
+
+        __nvgpu_check_kalloc_size(size);
+
+        __nvgpu_save_kmem_alloc(g->kmallocs, size, roundup_pow_of_two(size),
+                                (u64)(uintptr_t)alloc, ip);
+
+        return alloc;
+}
+
+void *__nvgpu_track_kcalloc(struct gk20a *g, size_t n, size_t size,
+                            void *ip)
+{
+        void *alloc = kcalloc(n, size, GFP_KERNEL);
+
+        if (!alloc)
+                return NULL;
+
+        __nvgpu_check_kalloc_size(n * size);
+
+        __nvgpu_save_kmem_alloc(g->kmallocs, n * size,
+                                roundup_pow_of_two(n * size),
+                                (u64)(uintptr_t)alloc, ip);
+
+        return alloc;
+}
+
+void __nvgpu_track_vfree(struct gk20a *g, void *addr)
+{
+        /*
+         * Often it is accepted practice to pass NULL pointers into free
+         * functions to save code.
+         */
+        if (!addr)
+                return;
+
+        __nvgpu_free_kmem_alloc(g->vmallocs, (u64)(uintptr_t)addr);
+
+        vfree(addr);
+}
+
+void __nvgpu_track_kfree(struct gk20a *g, void *addr)
+{
+        if (!addr)
+                return;
+
+        __nvgpu_free_kmem_alloc(g->kmallocs, (u64)(uintptr_t)addr);
+
+        kfree(addr);
+}
+
+static int __do_check_for_outstanding_allocs(
+        struct gk20a *g,
+        struct nvgpu_mem_alloc_tracker *tracker,
+        const char *type, bool silent)
+{
+        struct nvgpu_rbtree_node *node;
+        int count = 0;
+
+        nvgpu_rbtree_enum_start(0, &node, tracker->allocs);
+        while (node) {
+                struct nvgpu_mem_alloc *alloc =
+                        nvgpu_mem_alloc_from_rbtree_node(node);
+
+                if (!silent)
+                        kmem_print_mem_alloc(g, alloc, NULL);
+
+                count++;
+                nvgpu_rbtree_enum_next(&node, node);
+        }
+
+        return count;
+}
+
+/**
+ * check_for_outstanding_allocs - Count and display outstanding allocs
+ *
+ * @g      - The GPU.
+ * @silent - If set don't print anything about the allocs.
+ *
+ * Dump (or just count) the number of allocations left outstanding.
+ */
+static int check_for_outstanding_allocs(struct gk20a *g, bool silent)
+{
+        int count = 0;
+
+        count += __do_check_for_outstanding_allocs(g, g->kmallocs, "kmalloc",
+                                                   silent);
+        count += __do_check_for_outstanding_allocs(g, g->vmallocs, "vmalloc",
+                                                   silent);
+
+        return count;
+}
+
+static void do_nvgpu_kmem_cleanup(struct nvgpu_mem_alloc_tracker *tracker,
+                                  void (*force_free_func)(const void *))
+{
+        struct nvgpu_rbtree_node *node;
+
+        nvgpu_rbtree_enum_start(0, &node, tracker->allocs);
+        while (node) {
+                struct nvgpu_mem_alloc *alloc =
+                        nvgpu_mem_alloc_from_rbtree_node(node);
+
+                if (force_free_func)
+                        force_free_func((void *)alloc->addr);
+
+                nvgpu_rbtree_unlink(node, &tracker->allocs);
+                kfree(alloc);
+
+                nvgpu_rbtree_enum_start(0, &node, tracker->allocs);
+        }
+}
+
+/**
+ * nvgpu_kmem_cleanup - Cleanup the kmem tracking
+ *
+ * @g          - The GPU.
+ * @force_free - If set will also free leaked objects if possible.
+ *
+ * Cleanup all of the allocs made by nvgpu_kmem tracking code. If @force_free
+ * is non-zero then the allocation made by nvgpu is also freed. This is risky,
+ * though, as it is possible that the memory is still in use by other parts of
+ * the GPU driver not aware that this has happened.
+ *
+ * In theory it should be fine if the GPU driver has been deinitialized and
+ * there are no bugs in that code. However, if there are any bugs in that code
+ * then they could likely manifest as odd crashes indeterminate amounts of time
+ * in the future. So use @force_free at your own risk.
+ */
+static void nvgpu_kmem_cleanup(struct gk20a *g, bool force_free)
+{
+        do_nvgpu_kmem_cleanup(g->kmallocs, force_free ? kfree : NULL);
+        do_nvgpu_kmem_cleanup(g->vmallocs, force_free ? vfree : NULL);
+}
+
+void nvgpu_kmem_fini(struct gk20a *g, int flags)
+{
+        int count;
+        bool silent, force_free;
+
+        if (!flags)
+                return;
+
+        silent = !(flags & NVGPU_KMEM_FINI_DUMP_ALLOCS);
+        force_free = !!(flags & NVGPU_KMEM_FINI_FORCE_CLEANUP);
+
+        count = check_for_outstanding_allocs(g, silent);
+        nvgpu_kmem_cleanup(g, force_free);
+
+        /*
+         * If we leak objects we can either BUG() out or just WARN(). In general
+         * it doesn't make sense to BUG() on here since leaking a few objects
+         * won't crash the kernel but it can be helpful for development.
+         *
+         * If neither flag is set then we just silently do nothing.
+         */
+        if (count > 0) {
+                if (flags & NVGPU_KMEM_FINI_WARN) {
+                        WARN(1, "Letting %d allocs leak!!\n", count);
+                } else if (flags & NVGPU_KMEM_FINI_BUG) {
+                        nvgpu_err(g, "Letting %d allocs leak!!", count);
+                        BUG();
+                }
+        }
+}
+
+int nvgpu_kmem_init(struct gk20a *g)
+{
+        int err;
+
+        g->vmallocs = kzalloc(sizeof(*g->vmallocs), GFP_KERNEL);
+        g->kmallocs = kzalloc(sizeof(*g->kmallocs), GFP_KERNEL);
+
+        if (!g->vmallocs || !g->kmallocs) {
+                err = -ENOMEM;
+                goto fail;
+        }
+
+        g->vmallocs->name = "vmalloc";
+        g->kmallocs->name = "kmalloc";
+
+        g->vmallocs->allocs = NULL;
+        g->kmallocs->allocs = NULL;
+
+        nvgpu_mutex_init(&g->vmallocs->lock);
+        nvgpu_mutex_init(&g->kmallocs->lock);
+
+        g->vmallocs->min_alloc = PAGE_SIZE;
+        g->kmallocs->min_alloc = KMALLOC_MIN_SIZE;
+
+        /*
+         * This needs to go after all the other initialization since they use
+         * the nvgpu_kzalloc() API.
+         */
+        g->vmallocs->allocs_cache = nvgpu_kmem_cache_create(g,
+                                                sizeof(struct nvgpu_mem_alloc));
+        g->kmallocs->allocs_cache = nvgpu_kmem_cache_create(g,
+                                                sizeof(struct nvgpu_mem_alloc));
+
+        if (!g->vmallocs->allocs_cache || !g->kmallocs->allocs_cache) {
+                err = -ENOMEM;
+                if (g->vmallocs->allocs_cache)
+                        nvgpu_kmem_cache_destroy(g->vmallocs->allocs_cache);
+                if (g->kmallocs->allocs_cache)
+                        nvgpu_kmem_cache_destroy(g->kmallocs->allocs_cache);
+                goto fail;
+        }
+
+        return 0;
+
+fail:
+        if (g->vmallocs)
+                kfree(g->vmallocs);
+        if (g->kmallocs)
+                kfree(g->kmallocs);
+        return err;
+}
+
+#else /* !CONFIG_NVGPU_TRACK_MEM_USAGE */
+
+int nvgpu_kmem_init(struct gk20a *g)
+{
+        return 0;
+}
+
+void nvgpu_kmem_fini(struct gk20a *g, int flags)
+{
+}
+#endif /* CONFIG_NVGPU_TRACK_MEM_USAGE */
+
+struct nvgpu_kmem_cache *nvgpu_kmem_cache_create(struct gk20a *g, size_t size)
+{
+        struct nvgpu_kmem_cache *cache =
+                nvgpu_kzalloc(g, sizeof(struct nvgpu_kmem_cache));
+
+        if (!cache)
+                return NULL;
+
+        cache->g = g;
+
+        snprintf(cache->name, sizeof(cache->name),
+                 "nvgpu-cache-0x%p-%d-%d", g, (int)size,
+                 atomic_inc_return(&kmem_cache_id));
+        cache->cache = kmem_cache_create(cache->name,
+                                         size, size, 0, NULL);
+        if (!cache->cache) {
+                nvgpu_kfree(g, cache);
+                return NULL;
+        }
+
+        return cache;
+}
+
+void nvgpu_kmem_cache_destroy(struct nvgpu_kmem_cache *cache)
+{
+        struct gk20a *g = cache->g;
+
+        kmem_cache_destroy(cache->cache);
+        nvgpu_kfree(g, cache);
+}
+
+void *nvgpu_kmem_cache_alloc(struct nvgpu_kmem_cache *cache)
+{
+        return kmem_cache_alloc(cache->cache, GFP_KERNEL);
+}
+
+void nvgpu_kmem_cache_free(struct nvgpu_kmem_cache *cache, void *ptr)
+{
+        kmem_cache_free(cache->cache, ptr);
+}
diff --git a/include/os/linux/kmem_priv.h b/include/os/linux/kmem_priv.h
new file mode 100644
index 0000000..a41762a
--- /dev/null
+++ b/include/os/linux/kmem_priv.h
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __KMEM_PRIV_H__
+#define __KMEM_PRIV_H__
+
+#include <nvgpu/rbtree.h>
+#include <nvgpu/lock.h>
+
+struct seq_file;
+
+#define __pstat(s, fmt, msg...)                         \
+        do {                                            \
+                if (s)                                  \
+                        seq_printf(s, fmt, ##msg);      \
+                else                                    \
+                        pr_info(fmt, ##msg);            \
+        } while (0)
+
+#define MAX_STACK_TRACE                         20
+
+/*
+ * Linux specific version of the nvgpu_kmem_cache struct. This type is
+ * completely opaque to the rest of the driver.
+ */
+struct nvgpu_kmem_cache {
+        struct gk20a *g;
+        struct kmem_cache *cache;
+
+        /*
+         * Memory to hold the kmem_cache unique name. Only necessary on our
+         * k3.10 kernel when not using the SLUB allocator but it's easier to
+         * just carry this on to newer kernels.
+         */
+        char name[128];
+};
+
+#ifdef CONFIG_NVGPU_TRACK_MEM_USAGE
+
+struct nvgpu_mem_alloc {
+        struct nvgpu_mem_alloc_tracker *owner;
+
+        void *ip;
+#ifdef __NVGPU_SAVE_KALLOC_STACK_TRACES
+        unsigned long stack[MAX_STACK_TRACE];
+        int stack_length;
+#endif
+
+        u64 addr;
+
+        unsigned long size;
+        unsigned long real_size;
+
+        struct nvgpu_rbtree_node allocs_entry;
+};
+
+static inline struct nvgpu_mem_alloc *
+nvgpu_mem_alloc_from_rbtree_node(struct nvgpu_rbtree_node *node)
+{
+        return (struct nvgpu_mem_alloc *)
+        ((uintptr_t)node - offsetof(struct nvgpu_mem_alloc, allocs_entry));
+};
+
+/*
+ * Linux specific tracking of vmalloc, kmalloc, etc.
+ */
+struct nvgpu_mem_alloc_tracker {
+        const char *name;
+        struct nvgpu_kmem_cache *allocs_cache;
+        struct nvgpu_rbtree_node *allocs;
+        struct nvgpu_mutex lock;
+
+        u64 bytes_alloced;
+        u64 bytes_freed;
+        u64 bytes_alloced_real;
+        u64 bytes_freed_real;
+        u64 nr_allocs;
+        u64 nr_frees;
+
+        unsigned long min_alloc;
+        unsigned long max_alloc;
+};
+
+void nvgpu_lock_tracker(struct nvgpu_mem_alloc_tracker *tracker);
+void nvgpu_unlock_tracker(struct nvgpu_mem_alloc_tracker *tracker);
+
+void kmem_print_mem_alloc(struct gk20a *g,
+                         struct nvgpu_mem_alloc *alloc,
+                         struct seq_file *s);
+#endif /* CONFIG_NVGPU_TRACK_MEM_USAGE */
+
+#endif /* __KMEM_PRIV_H__ */
diff --git a/include/os/linux/linux-channel.c b/include/os/linux/linux-channel.c
new file mode 100644
index 0000000..d035baf
--- /dev/null
+++ b/include/os/linux/linux-channel.c
@@ -0,0 +1,657 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <nvgpu/enabled.h>
+#include <nvgpu/debug.h>
+#include <nvgpu/error_notifier.h>
+#include <nvgpu/os_sched.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/channel.h>
+#include <nvgpu/dma.h>
+
+/*
+ * This is required for nvgpu_vm_find_buf() which is used in the tracing
+ * code. Once we can get and access userspace buffers without requiring
+ * direct dma_buf usage this can be removed.
+ */
+#include <nvgpu/linux/vm.h>
+
+#include "channel.h"
+#include "ioctl_channel.h"
+#include "os_linux.h"
+#include "dmabuf.h"
+
+#include <nvgpu/hw/gk20a/hw_pbdma_gk20a.h>
+
+#include <linux/uaccess.h>
+#include <linux/dma-buf.h>
+#include <trace/events/gk20a.h>
+#include <uapi/linux/nvgpu.h>
+
+#include "sync_sema_android.h"
+
+u32 nvgpu_submit_gpfifo_user_flags_to_common_flags(u32 user_flags)
+{
+        u32 flags = 0;
+
+        if (user_flags & NVGPU_SUBMIT_GPFIFO_FLAGS_FENCE_WAIT)
+                flags |= NVGPU_SUBMIT_FLAGS_FENCE_WAIT;
+
+        if (user_flags & NVGPU_SUBMIT_GPFIFO_FLAGS_FENCE_GET)
+                flags |= NVGPU_SUBMIT_FLAGS_FENCE_GET;
+
+        if (user_flags & NVGPU_SUBMIT_GPFIFO_FLAGS_HW_FORMAT)
+                flags |= NVGPU_SUBMIT_FLAGS_HW_FORMAT;
+
+        if (user_flags & NVGPU_SUBMIT_GPFIFO_FLAGS_SYNC_FENCE)
+                flags |= NVGPU_SUBMIT_FLAGS_SYNC_FENCE;
+
+        if (user_flags & NVGPU_SUBMIT_GPFIFO_FLAGS_SUPPRESS_WFI)
+                flags |= NVGPU_SUBMIT_FLAGS_SUPPRESS_WFI;
+
+        if (user_flags & NVGPU_SUBMIT_GPFIFO_FLAGS_SKIP_BUFFER_REFCOUNTING)
+                flags |= NVGPU_SUBMIT_FLAGS_SKIP_BUFFER_REFCOUNTING;
+
+        return flags;
+}
+
+/*
+ * API to convert error_notifiers in common code and of the form
+ * NVGPU_ERR_NOTIFIER_* into Linux specific error_notifiers exposed to user
+ * space and of the form  NVGPU_CHANNEL_*
+ */
+static u32 nvgpu_error_notifier_to_channel_notifier(u32 error_notifier)
+{
+        switch (error_notifier) {
+        case NVGPU_ERR_NOTIFIER_FIFO_ERROR_IDLE_TIMEOUT:
+                return NVGPU_CHANNEL_FIFO_ERROR_IDLE_TIMEOUT;
+        case NVGPU_ERR_NOTIFIER_GR_ERROR_SW_METHOD:
+                return NVGPU_CHANNEL_GR_ERROR_SW_METHOD;
+        case NVGPU_ERR_NOTIFIER_GR_ERROR_SW_NOTIFY:
+                return NVGPU_CHANNEL_GR_ERROR_SW_NOTIFY;
+        case NVGPU_ERR_NOTIFIER_GR_EXCEPTION:
+                return NVGPU_CHANNEL_GR_EXCEPTION;
+        case NVGPU_ERR_NOTIFIER_GR_SEMAPHORE_TIMEOUT:
+                return NVGPU_CHANNEL_GR_SEMAPHORE_TIMEOUT;
+        case NVGPU_ERR_NOTIFIER_GR_ILLEGAL_NOTIFY:
+                return NVGPU_CHANNEL_GR_ILLEGAL_NOTIFY;
+        case NVGPU_ERR_NOTIFIER_FIFO_ERROR_MMU_ERR_FLT:
+                return NVGPU_CHANNEL_FIFO_ERROR_MMU_ERR_FLT;
+        case NVGPU_ERR_NOTIFIER_PBDMA_ERROR:
+                return NVGPU_CHANNEL_PBDMA_ERROR;
+        case NVGPU_ERR_NOTIFIER_FECS_ERR_UNIMP_FIRMWARE_METHOD:
+                return NVGPU_CHANNEL_FECS_ERR_UNIMP_FIRMWARE_METHOD;
+        case NVGPU_ERR_NOTIFIER_RESETCHANNEL_VERIF_ERROR:
+                return NVGPU_CHANNEL_RESETCHANNEL_VERIF_ERROR;
+        case NVGPU_ERR_NOTIFIER_PBDMA_PUSHBUFFER_CRC_MISMATCH:
+                return NVGPU_CHANNEL_PBDMA_PUSHBUFFER_CRC_MISMATCH;
+        }
+
+        pr_warn("%s: invalid error_notifier requested %u\n", __func__, error_notifier);
+
+        return error_notifier;
+}
+
+/**
+ * nvgpu_set_error_notifier_locked()
+ * Should be called with ch->error_notifier_mutex held
+ *
+ * error should be of the form  NVGPU_ERR_NOTIFIER_*
+ */
+void nvgpu_set_error_notifier_locked(struct channel_gk20a *ch, u32 error)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+
+        error = nvgpu_error_notifier_to_channel_notifier(error);
+
+        if (priv->error_notifier.dmabuf) {
+                struct nvgpu_notification *notification =
+                        priv->error_notifier.notification;
+                struct timespec time_data;
+                u64 nsec;
+
+                getnstimeofday(&time_data);
+                nsec = ((u64)time_data.tv_sec) * 1000000000u +
+                                (u64)time_data.tv_nsec;
+                notification->time_stamp.nanoseconds[0] =
+                                (u32)nsec;
+                notification->time_stamp.nanoseconds[1] =
+                                (u32)(nsec >> 32);
+                notification->info32 = error;
+                notification->status = 0xffff;
+
+                nvgpu_err(ch->g,
+                    "error notifier set to %d for ch %d", error, ch->chid);
+        }
+}
+
+/* error should be of the form  NVGPU_ERR_NOTIFIER_* */
+void nvgpu_set_error_notifier(struct channel_gk20a *ch, u32 error)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+
+        nvgpu_mutex_acquire(&priv->error_notifier.mutex);
+        nvgpu_set_error_notifier_locked(ch, error);
+        nvgpu_mutex_release(&priv->error_notifier.mutex);
+}
+
+void nvgpu_set_error_notifier_if_empty(struct channel_gk20a *ch, u32 error)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+
+        nvgpu_mutex_acquire(&priv->error_notifier.mutex);
+        if (priv->error_notifier.dmabuf) {
+                struct nvgpu_notification *notification =
+                        priv->error_notifier.notification;
+
+                /* Don't overwrite error flag if it is already set */
+                if (notification->status != 0xffff)
+                        nvgpu_set_error_notifier_locked(ch, error);
+        }
+        nvgpu_mutex_release(&priv->error_notifier.mutex);
+}
+
+/* error_notifier should be of the form  NVGPU_ERR_NOTIFIER_* */
+bool nvgpu_is_error_notifier_set(struct channel_gk20a *ch, u32 error_notifier)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+        bool notifier_set = false;
+
+        error_notifier = nvgpu_error_notifier_to_channel_notifier(error_notifier);
+
+        nvgpu_mutex_acquire(&priv->error_notifier.mutex);
+        if (priv->error_notifier.dmabuf) {
+                struct nvgpu_notification *notification =
+                        priv->error_notifier.notification;
+                u32 err = notification->info32;
+
+                if (err == error_notifier)
+                        notifier_set = true;
+        }
+        nvgpu_mutex_release(&priv->error_notifier.mutex);
+
+        return notifier_set;
+}
+
+static void gk20a_channel_update_runcb_fn(struct work_struct *work)
+{
+        struct nvgpu_channel_completion_cb *completion_cb =
+                container_of(work, struct nvgpu_channel_completion_cb, work);
+        struct nvgpu_channel_linux *priv =
+                container_of(completion_cb,
+                                struct nvgpu_channel_linux, completion_cb);
+        struct channel_gk20a *ch = priv->ch;
+        void (*fn)(struct channel_gk20a *, void *);
+        void *user_data;
+
+        nvgpu_spinlock_acquire(&completion_cb->lock);
+        fn = completion_cb->fn;
+        user_data = completion_cb->user_data;
+        nvgpu_spinlock_release(&completion_cb->lock);
+
+        if (fn)
+                fn(ch, user_data);
+}
+
+static void nvgpu_channel_work_completion_init(struct channel_gk20a *ch)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+
+        priv->completion_cb.fn = NULL;
+        priv->completion_cb.user_data = NULL;
+        nvgpu_spinlock_init(&priv->completion_cb.lock);
+        INIT_WORK(&priv->completion_cb.work, gk20a_channel_update_runcb_fn);
+}
+
+static void nvgpu_channel_work_completion_clear(struct channel_gk20a *ch)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+
+        nvgpu_spinlock_acquire(&priv->completion_cb.lock);
+        priv->completion_cb.fn = NULL;
+        priv->completion_cb.user_data = NULL;
+        nvgpu_spinlock_release(&priv->completion_cb.lock);
+        cancel_work_sync(&priv->completion_cb.work);
+}
+
+static void nvgpu_channel_work_completion_signal(struct channel_gk20a *ch)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+
+        if (priv->completion_cb.fn)
+                schedule_work(&priv->completion_cb.work);
+}
+
+static void nvgpu_channel_work_completion_cancel_sync(struct channel_gk20a *ch)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+
+        if (priv->completion_cb.fn)
+                cancel_work_sync(&priv->completion_cb.work);
+}
+
+struct channel_gk20a *gk20a_open_new_channel_with_cb(struct gk20a *g,
+                void (*update_fn)(struct channel_gk20a *, void *),
+                void *update_fn_data,
+                int runlist_id,
+                bool is_privileged_channel)
+{
+        struct channel_gk20a *ch;
+        struct nvgpu_channel_linux *priv;
+
+        ch = gk20a_open_new_channel(g, runlist_id, is_privileged_channel,
+                                nvgpu_current_pid(g), nvgpu_current_tid(g));
+
+        if (ch) {
+                priv = ch->os_priv;
+                nvgpu_spinlock_acquire(&priv->completion_cb.lock);
+                priv->completion_cb.fn = update_fn;
+                priv->completion_cb.user_data = update_fn_data;
+                nvgpu_spinlock_release(&priv->completion_cb.lock);
+        }
+
+        return ch;
+}
+
+static void nvgpu_channel_open_linux(struct channel_gk20a *ch)
+{
+}
+
+static void nvgpu_channel_close_linux(struct channel_gk20a *ch)
+{
+        nvgpu_channel_work_completion_clear(ch);
+
+#if defined(CONFIG_GK20A_CYCLE_STATS)
+        gk20a_channel_free_cycle_stats_buffer(ch);
+        gk20a_channel_free_cycle_stats_snapshot(ch);
+#endif
+}
+
+static int nvgpu_channel_alloc_linux(struct gk20a *g, struct channel_gk20a *ch)
+{
+        struct nvgpu_channel_linux *priv;
+        int err;
+
+        priv = nvgpu_kzalloc(g, sizeof(*priv));
+        if (!priv)
+                return -ENOMEM;
+
+        ch->os_priv = priv;
+        priv->ch = ch;
+
+#ifdef CONFIG_SYNC
+        ch->has_os_fence_framework_support = true;
+#endif
+
+        err = nvgpu_mutex_init(&priv->error_notifier.mutex);
+        if (err) {
+                nvgpu_kfree(g, priv);
+                return err;
+        }
+
+        nvgpu_channel_work_completion_init(ch);
+
+        return 0;
+}
+
+static void nvgpu_channel_free_linux(struct gk20a *g, struct channel_gk20a *ch)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+
+        nvgpu_mutex_destroy(&priv->error_notifier.mutex);
+        nvgpu_kfree(g, priv);
+
+        ch->os_priv = NULL;
+
+#ifdef CONFIG_SYNC
+        ch->has_os_fence_framework_support = false;
+#endif
+}
+
+static int nvgpu_channel_init_os_fence_framework(struct channel_gk20a *ch,
+        const char *fmt, ...)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+        struct nvgpu_os_fence_framework *fence_framework;
+        char name[30];
+        va_list args;
+
+        fence_framework = &priv->fence_framework;
+
+        va_start(args, fmt);
+        vsnprintf(name, sizeof(name), fmt, args);
+        va_end(args);
+
+        fence_framework->timeline = gk20a_sync_timeline_create(name);
+
+        if (!fence_framework->timeline)
+                return -EINVAL;
+
+        return 0;
+}
+static void nvgpu_channel_signal_os_fence_framework(struct channel_gk20a *ch)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+        struct nvgpu_os_fence_framework *fence_framework;
+
+        fence_framework = &priv->fence_framework;
+
+        gk20a_sync_timeline_signal(fence_framework->timeline);
+}
+
+static void nvgpu_channel_destroy_os_fence_framework(struct channel_gk20a *ch)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+        struct nvgpu_os_fence_framework *fence_framework;
+
+        fence_framework = &priv->fence_framework;
+
+        gk20a_sync_timeline_destroy(fence_framework->timeline);
+        fence_framework->timeline = NULL;
+}
+
+static bool nvgpu_channel_fence_framework_exists(struct channel_gk20a *ch)
+{
+        struct nvgpu_channel_linux *priv = ch->os_priv;
+        struct nvgpu_os_fence_framework *fence_framework;
+
+        fence_framework = &priv->fence_framework;
+
+        return (fence_framework->timeline != NULL);
+}
+
+static int nvgpu_channel_copy_user_gpfifo(struct nvgpu_gpfifo_entry *dest,
+                struct nvgpu_gpfifo_userdata userdata, u32 start, u32 length)
+{
+        struct nvgpu_gpfifo_entry __user *user_gpfifo = userdata.entries;
+        unsigned long n;
+
+        n = copy_from_user(dest, user_gpfifo + start,
+                        length * sizeof(struct nvgpu_gpfifo_entry));
+
+        return n == 0 ? 0 : -EFAULT;
+}
+
+int nvgpu_usermode_buf_from_dmabuf(struct gk20a *g, int dmabuf_fd,
+                struct nvgpu_mem *mem, struct nvgpu_usermode_buf_linux *buf)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct dma_buf *dmabuf;
+        struct sg_table *sgt;
+        struct dma_buf_attachment *attachment;
+        int err;
+
+        dmabuf = dma_buf_get(dmabuf_fd);
+        if (IS_ERR(dmabuf)) {
+                return PTR_ERR(dmabuf);
+        }
+
+        if (gk20a_dmabuf_aperture(g, dmabuf) == APERTURE_INVALID) {
+                err = -EINVAL;
+                goto put_dmabuf;
+        }
+
+        err = gk20a_dmabuf_alloc_drvdata(dmabuf, dev);
+        if (err != 0) {
+                goto put_dmabuf;
+        }
+
+        sgt = gk20a_mm_pin(dev, dmabuf, &attachment);
+        if (IS_ERR(sgt)) {
+                nvgpu_warn(g, "Failed to pin dma_buf!");
+                err = PTR_ERR(sgt);
+                goto put_dmabuf;
+        }
+
+        buf->dmabuf = dmabuf;
+        buf->attachment = attachment;
+        buf->sgt = sgt;
+
+        /*
+         * This mem is unmapped and freed in a common path; for Linux, we'll
+         * also need to unref the dmabuf stuff (above) but the sgt here is only
+         * borrowed, so it cannot be freed by nvgpu_mem_*.
+         */
+        mem->mem_flags  = NVGPU_MEM_FLAG_FOREIGN_SGT;
+        mem->aperture   = APERTURE_SYSMEM;
+        mem->skip_wmb   = 0;
+        mem->size       = dmabuf->size;
+
+        mem->priv.flags = 0;
+        mem->priv.pages = NULL;
+        mem->priv.sgt   = sgt;
+
+        return 0;
+put_dmabuf:
+        dma_buf_put(dmabuf);
+        return err;
+}
+
+void nvgpu_channel_free_usermode_buffers(struct channel_gk20a *c)
+{
+        struct nvgpu_channel_linux *priv = c->os_priv;
+        struct gk20a *g = c->g;
+        struct device *dev = dev_from_gk20a(g);
+
+        if (priv->usermode.gpfifo.dmabuf != NULL) {
+                gk20a_mm_unpin(dev, priv->usermode.gpfifo.dmabuf,
+                               priv->usermode.gpfifo.attachment,
+                               priv->usermode.gpfifo.sgt);
+                dma_buf_put(priv->usermode.gpfifo.dmabuf);
+                priv->usermode.gpfifo.dmabuf = NULL;
+        }
+
+        if (priv->usermode.userd.dmabuf != NULL) {
+                gk20a_mm_unpin(dev, priv->usermode.userd.dmabuf,
+                       priv->usermode.userd.attachment,
+                       priv->usermode.userd.sgt);
+                dma_buf_put(priv->usermode.userd.dmabuf);
+                priv->usermode.userd.dmabuf = NULL;
+        }
+}
+
+static int nvgpu_channel_alloc_usermode_buffers(struct channel_gk20a *c,
+                struct nvgpu_setup_bind_args *args)
+{
+        struct nvgpu_channel_linux *priv = c->os_priv;
+        struct gk20a *g = c->g;
+        struct device *dev = dev_from_gk20a(g);
+        size_t gpfifo_size;
+        int err;
+
+        if (args->gpfifo_dmabuf_fd == 0 || args->userd_dmabuf_fd == 0) {
+                return -EINVAL;
+        }
+
+        if (args->gpfifo_dmabuf_offset != 0 ||
+                        args->userd_dmabuf_offset != 0) {
+                /* TODO - not yet supported */
+                return -EINVAL;
+        }
+
+        err = nvgpu_usermode_buf_from_dmabuf(g, args->gpfifo_dmabuf_fd,
+                        &c->usermode_gpfifo, &priv->usermode.gpfifo);
+        if (err < 0) {
+                return err;
+        }
+
+        gpfifo_size = max_t(u32, SZ_4K,
+                        args->num_gpfifo_entries *
+                        nvgpu_get_gpfifo_entry_size());
+
+        if (c->usermode_gpfifo.size < gpfifo_size) {
+                err = -EINVAL;
+                goto free_gpfifo;
+        }
+
+        c->usermode_gpfifo.gpu_va = nvgpu_gmmu_map(c->vm, &c->usermode_gpfifo,
+                        c->usermode_gpfifo.size, 0, gk20a_mem_flag_none,
+                        false, c->usermode_gpfifo.aperture);
+
+        if (c->usermode_gpfifo.gpu_va == 0) {
+                err = -ENOMEM;
+                goto unmap_free_gpfifo;
+        }
+
+        err = nvgpu_usermode_buf_from_dmabuf(g, args->userd_dmabuf_fd,
+                        &c->usermode_userd, &priv->usermode.userd);
+        if (err < 0) {
+                goto unmap_free_gpfifo;
+        }
+
+        args->work_submit_token = g->fifo.channel_base + c->chid;
+
+        return 0;
+unmap_free_gpfifo:
+        nvgpu_dma_unmap_free(c->vm, &c->usermode_gpfifo);
+free_gpfifo:
+        gk20a_mm_unpin(dev, priv->usermode.gpfifo.dmabuf,
+                       priv->usermode.gpfifo.attachment,
+                       priv->usermode.gpfifo.sgt);
+        dma_buf_put(priv->usermode.gpfifo.dmabuf);
+        priv->usermode.gpfifo.dmabuf = NULL;
+        return err;
+}
+
+int nvgpu_init_channel_support_linux(struct nvgpu_os_linux *l)
+{
+        struct gk20a *g = &l->g;
+        struct fifo_gk20a *f = &g->fifo;
+        int chid;
+        int err;
+
+        for (chid = 0; chid < (int)f->num_channels; chid++) {
+                struct channel_gk20a *ch = &f->channel[chid];
+
+                err = nvgpu_channel_alloc_linux(g, ch);
+                if (err)
+                        goto err_clean;
+        }
+
+        g->os_channel.open = nvgpu_channel_open_linux;
+        g->os_channel.close = nvgpu_channel_close_linux;
+        g->os_channel.work_completion_signal =
+                nvgpu_channel_work_completion_signal;
+        g->os_channel.work_completion_cancel_sync =
+                nvgpu_channel_work_completion_cancel_sync;
+
+        g->os_channel.os_fence_framework_inst_exists =
+                nvgpu_channel_fence_framework_exists;
+        g->os_channel.init_os_fence_framework =
+                nvgpu_channel_init_os_fence_framework;
+        g->os_channel.signal_os_fence_framework =
+                nvgpu_channel_signal_os_fence_framework;
+        g->os_channel.destroy_os_fence_framework =
+                nvgpu_channel_destroy_os_fence_framework;
+
+        g->os_channel.copy_user_gpfifo =
+                nvgpu_channel_copy_user_gpfifo;
+
+        g->os_channel.alloc_usermode_buffers =
+                nvgpu_channel_alloc_usermode_buffers;
+
+        g->os_channel.free_usermode_buffers =
+                nvgpu_channel_free_usermode_buffers;
+
+        return 0;
+
+err_clean:
+        for (; chid >= 0; chid--) {
+                struct channel_gk20a *ch = &f->channel[chid];
+
+                nvgpu_channel_free_linux(g, ch);
+        }
+        return err;
+}
+
+void nvgpu_remove_channel_support_linux(struct nvgpu_os_linux *l)
+{
+        struct gk20a *g = &l->g;
+        struct fifo_gk20a *f = &g->fifo;
+        unsigned int chid;
+
+        for (chid = 0; chid < f->num_channels; chid++) {
+                struct channel_gk20a *ch = &f->channel[chid];
+
+                nvgpu_channel_free_linux(g, ch);
+        }
+
+        g->os_channel.os_fence_framework_inst_exists = NULL;
+        g->os_channel.init_os_fence_framework = NULL;
+        g->os_channel.signal_os_fence_framework = NULL;
+        g->os_channel.destroy_os_fence_framework = NULL;
+}
+
+u32 nvgpu_get_gpfifo_entry_size(void)
+{
+        return sizeof(struct nvgpu_gpfifo_entry);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void trace_write_pushbuffer(struct channel_gk20a *c,
+                                   struct nvgpu_gpfifo_entry *g)
+{
+        void *mem = NULL;
+        unsigned int words;
+        u64 offset;
+        struct dma_buf *dmabuf = NULL;
+
+        if (gk20a_debug_trace_cmdbuf) {
+                u64 gpu_va = (u64)g->entry0 |
+                        (u64)((u64)pbdma_gp_entry1_get_hi_v(g->entry1) << 32);
+                int err;
+
+                words = pbdma_gp_entry1_length_v(g->entry1);
+                err = nvgpu_vm_find_buf(c->vm, gpu_va, &dmabuf, &offset);
+                if (!err)
+                        mem = dma_buf_vmap(dmabuf);
+        }
+
+        if (mem) {
+                u32 i;
+                /*
+                 * Write in batches of 128 as there seems to be a limit
+                 * of how much you can output to ftrace at once.
+                 */
+                for (i = 0; i < words; i += 128U) {
+                        trace_gk20a_push_cmdbuf(
+                                c->g->name,
+                                0,
+                                min(words - i, 128U),
+                                offset + i * sizeof(u32),
+                                mem);
+                }
+                dma_buf_vunmap(dmabuf, mem);
+        }
+}
+
+void trace_write_pushbuffers(struct channel_gk20a *c, u32 count)
+{
+        struct nvgpu_gpfifo_entry *gp = c->gpfifo.mem.cpu_va;
+        u32 n = c->gpfifo.entry_num;
+        u32 start = c->gpfifo.put;
+        u32 i;
+
+        if (!gk20a_debug_trace_cmdbuf)
+                return;
+
+        if (!gp)
+                return;
+
+        for (i = 0; i < count; i++)
+                trace_write_pushbuffer(c, &gp[(start + i) % n]);
+}
+#endif
diff --git a/include/os/linux/linux-dma.c b/include/os/linux/linux-dma.c
new file mode 100644
index 0000000..d704b2a
--- /dev/null
+++ b/include/os/linux/linux-dma.c
@@ -0,0 +1,534 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/version.h>
+
+#include <nvgpu/log.h>
+#include <nvgpu/dma.h>
+#include <nvgpu/lock.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/gmmu.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/enabled.h>
+#include <nvgpu/vidmem.h>
+#include <nvgpu/gk20a.h>
+
+#include <nvgpu/linux/dma.h>
+
+#include "platform_gk20a.h"
+#include "os_linux.h"
+#include "dmabuf_vidmem.h"
+
+#ifdef __DMA_ATTRS_LONGS
+#define NVGPU_DEFINE_DMA_ATTRS(x)                                     \
+        struct dma_attrs x = {                                  \
+                .flags = { [0 ... __DMA_ATTRS_LONGS-1] = 0 },   \
+        }
+#define NVGPU_DMA_ATTR(attrs) &attrs
+#else
+#define NVGPU_DEFINE_DMA_ATTRS(attrs) unsigned long attrs = 0
+#define NVGPU_DMA_ATTR(attrs) attrs
+#endif
+
+/*
+ * Enough to hold all the possible flags in string form. When a new flag is
+ * added it must be added here as well!!
+ */
+#define NVGPU_DMA_STR_SIZE                                      \
+        sizeof("NO_KERNEL_MAPPING FORCE_CONTIGUOUS")
+
+/*
+ * The returned string is kmalloc()ed here but must be freed by the caller.
+ */
+static char *nvgpu_dma_flags_to_str(struct gk20a *g, unsigned long flags)
+{
+        char *buf = nvgpu_kzalloc(g, NVGPU_DMA_STR_SIZE);
+        int bytes_available = NVGPU_DMA_STR_SIZE;
+
+        /*
+         * Return the empty buffer if there's no flags. Makes it easier on the
+         * calling code to just print it instead of any if (NULL) type logic.
+         */
+        if (!flags)
+                return buf;
+
+#define APPEND_FLAG(flag, str_flag)                                     \
+        do {                                                            \
+                if (flags & flag) {                                     \
+                        strncat(buf, str_flag, bytes_available);        \
+                        bytes_available -= strlen(str_flag);            \
+                }                                                       \
+        } while (0)
+
+        APPEND_FLAG(NVGPU_DMA_NO_KERNEL_MAPPING, "NO_KERNEL_MAPPING ");
+        APPEND_FLAG(NVGPU_DMA_FORCE_CONTIGUOUS,  "FORCE_CONTIGUOUS ");
+#undef APPEND_FLAG
+
+        return buf;
+}
+
+/**
+ * __dma_dbg - Debug print for DMA allocs and frees.
+ *
+ * @g     - The GPU.
+ * @size  - The requested size of the alloc (size_t).
+ * @flags - The flags (unsigned long).
+ * @type  - A string describing the type (i.e: sysmem or vidmem).
+ * @what  - A string with 'alloc' or 'free'.
+ *
+ * @flags is the DMA flags. If there are none or it doesn't make sense to print
+ * flags just pass 0.
+ *
+ * Please use dma_dbg_alloc() and dma_dbg_free() instead of this function.
+ */
+static void __dma_dbg(struct gk20a *g, size_t size, unsigned long flags,
+                      const char *type, const char *what,
+                      const char *func, int line)
+{
+        char *flags_str = NULL;
+
+        /*
+         * Don't bother making the flags_str if debugging is
+         * not enabled. This saves a malloc and a free.
+         */
+        if (!nvgpu_log_mask_enabled(g, gpu_dbg_dma))
+                return;
+
+        flags_str = nvgpu_dma_flags_to_str(g, flags);
+
+        __nvgpu_log_dbg(g, gpu_dbg_dma,
+                        func, line,
+                        "DMA %s: [%s] size=%-7zu "
+                        "aligned=%-7zu total=%-10llukB %s",
+                        what, type,
+                        size, PAGE_ALIGN(size),
+                        g->dma_memory_used >> 10,
+                        flags_str);
+
+        if (flags_str)
+                nvgpu_kfree(g, flags_str);
+}
+
+#define dma_dbg_alloc(g, size, flags, type)                             \
+        __dma_dbg(g, size, flags, type, "alloc", __func__, __LINE__)
+#define dma_dbg_free(g, size, flags, type)                              \
+        __dma_dbg(g, size, flags, type, "free", __func__, __LINE__)
+
+/*
+ * For after the DMA alloc is done.
+ */
+#define __dma_dbg_done(g, size, type, what)                             \
+        nvgpu_log(g, gpu_dbg_dma,                                       \
+                  "DMA %s: [%s] size=%-7zu Done!",                      \
+                  what, type, size);                                    \
+
+#define dma_dbg_alloc_done(g, size, type)                               \
+        __dma_dbg_done(g, size, type, "alloc")
+#define dma_dbg_free_done(g, size, type)                                \
+        __dma_dbg_done(g, size, type, "free")
+
+#if defined(CONFIG_GK20A_VIDMEM)
+static u64 __nvgpu_dma_alloc(struct nvgpu_allocator *allocator, u64 at,
+                                size_t size)
+{
+        u64 addr = 0;
+
+        if (at)
+                addr = nvgpu_alloc_fixed(allocator, at, size, 0);
+        else
+                addr = nvgpu_alloc(allocator, size);
+
+        return addr;
+}
+#endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
+static void nvgpu_dma_flags_to_attrs(unsigned long *attrs,
+                unsigned long flags)
+#define ATTR_ARG(x) *x
+#else
+static void nvgpu_dma_flags_to_attrs(struct dma_attrs *attrs,
+                unsigned long flags)
+#define ATTR_ARG(x) x
+#endif
+{
+        if (flags & NVGPU_DMA_NO_KERNEL_MAPPING)
+                dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, ATTR_ARG(attrs));
+        if (flags & NVGPU_DMA_FORCE_CONTIGUOUS)
+                dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, ATTR_ARG(attrs));
+#undef ATTR_ARG
+}
+
+int nvgpu_dma_alloc_flags_sys(struct gk20a *g, unsigned long flags,
+                size_t size, struct nvgpu_mem *mem)
+{
+        struct device *d = dev_from_gk20a(g);
+        int err;
+        dma_addr_t iova;
+        NVGPU_DEFINE_DMA_ATTRS(dma_attrs);
+        void *alloc_ret;
+
+        if (nvgpu_mem_is_valid(mem)) {
+                nvgpu_warn(g, "memory leak !!");
+                WARN_ON(1);
+        }
+
+        /*
+         * WAR for IO coherent chips: the DMA API does not seem to generate
+         * mappings that work correctly. Unclear why - Bug ID: 2040115.
+         *
+         * Basically we just tell the DMA API not to map with NO_KERNEL_MAPPING
+         * and then make a vmap() ourselves.
+         */
+        if (nvgpu_is_enabled(g, NVGPU_USE_COHERENT_SYSMEM))
+                flags |= NVGPU_DMA_NO_KERNEL_MAPPING;
+
+        /*
+         * Before the debug print so we see this in the total. But during
+         * cleanup in the fail path this has to be subtracted.
+         */
+        g->dma_memory_used += PAGE_ALIGN(size);
+
+        dma_dbg_alloc(g, size, flags, "sysmem");
+
+        /*
+         * Save the old size but for actual allocation purposes the size is
+         * going to be page aligned.
+         */
+        mem->size = size;
+        size = PAGE_ALIGN(size);
+
+        nvgpu_dma_flags_to_attrs(&dma_attrs, flags);
+
+        alloc_ret = dma_alloc_attrs(d, size, &iova,
+                                    GFP_KERNEL|__GFP_ZERO,
+                                    NVGPU_DMA_ATTR(dma_attrs));
+        if (!alloc_ret)
+                return -ENOMEM;
+
+        if (flags & NVGPU_DMA_NO_KERNEL_MAPPING) {
+                mem->priv.pages = alloc_ret;
+                err = nvgpu_get_sgtable_from_pages(g, &mem->priv.sgt,
+                                                   mem->priv.pages,
+                                                   iova, size);
+        } else {
+                mem->cpu_va = alloc_ret;
+                err = nvgpu_get_sgtable_attrs(g, &mem->priv.sgt, mem->cpu_va,
+                                        iova, size, flags);
+        }
+        if (err)
+                goto fail_free_dma;
+
+        if (nvgpu_is_enabled(g, NVGPU_USE_COHERENT_SYSMEM)) {
+                mem->cpu_va = vmap(mem->priv.pages,
+                                   size >> PAGE_SHIFT,
+                                   0, PAGE_KERNEL);
+                if (!mem->cpu_va) {
+                        err = -ENOMEM;
+                        goto fail_free_sgt;
+                }
+        }
+
+        mem->aligned_size = size;
+        mem->aperture = APERTURE_SYSMEM;
+        mem->priv.flags = flags;
+
+        dma_dbg_alloc_done(g, mem->size, "sysmem");
+
+        return 0;
+
+fail_free_sgt:
+        nvgpu_free_sgtable(g, &mem->priv.sgt);
+fail_free_dma:
+        dma_free_attrs(d, size, alloc_ret, iova, NVGPU_DMA_ATTR(dma_attrs));
+        mem->cpu_va = NULL;
+        mem->priv.sgt = NULL;
+        mem->size = 0;
+        g->dma_memory_used -= mem->aligned_size;
+        return err;
+}
+
+int nvgpu_dma_alloc_flags_vid_at(struct gk20a *g, unsigned long flags,
+                size_t size, struct nvgpu_mem *mem, u64 at)
+{
+#if defined(CONFIG_GK20A_VIDMEM)
+        u64 addr;
+        int err;
+        struct nvgpu_allocator *vidmem_alloc = g->mm.vidmem.cleared ?
+                &g->mm.vidmem.allocator :
+                &g->mm.vidmem.bootstrap_allocator;
+        u64 before_pending;
+
+        if (nvgpu_mem_is_valid(mem)) {
+                nvgpu_warn(g, "memory leak !!");
+                WARN_ON(1);
+        }
+
+        dma_dbg_alloc(g, size, flags, "vidmem");
+
+        mem->size = size;
+        size = PAGE_ALIGN(size);
+
+        if (!nvgpu_alloc_initialized(&g->mm.vidmem.allocator))
+                return -ENOSYS;
+
+        /*
+         * Our own allocator doesn't have any flags yet, and we can't
+         * kernel-map these, so require explicit flags.
+         */
+        WARN_ON(flags != NVGPU_DMA_NO_KERNEL_MAPPING);
+
+        nvgpu_mutex_acquire(&g->mm.vidmem.clear_list_mutex);
+        before_pending = atomic64_read(&g->mm.vidmem.bytes_pending.atomic_var);
+        addr = __nvgpu_dma_alloc(vidmem_alloc, at, size);
+        nvgpu_mutex_release(&g->mm.vidmem.clear_list_mutex);
+        if (!addr) {
+                /*
+                 * If memory is known to be freed soon, let the user know that
+                 * it may be available after a while.
+                 */
+                if (before_pending)
+                        return -EAGAIN;
+                else
+                        return -ENOMEM;
+        }
+
+        if (at)
+                mem->mem_flags |= NVGPU_MEM_FLAG_FIXED;
+
+        mem->priv.sgt = nvgpu_kzalloc(g, sizeof(struct sg_table));
+        if (!mem->priv.sgt) {
+                err = -ENOMEM;
+                goto fail_physfree;
+        }
+
+        err = sg_alloc_table(mem->priv.sgt, 1, GFP_KERNEL);
+        if (err)
+                goto fail_kfree;
+
+        nvgpu_vidmem_set_page_alloc(mem->priv.sgt->sgl, addr);
+        sg_set_page(mem->priv.sgt->sgl, NULL, size, 0);
+
+        mem->aligned_size = size;
+        mem->aperture = APERTURE_VIDMEM;
+        mem->vidmem_alloc = (struct nvgpu_page_alloc *)(uintptr_t)addr;
+        mem->allocator = vidmem_alloc;
+        mem->priv.flags = flags;
+
+        nvgpu_init_list_node(&mem->clear_list_entry);
+
+        dma_dbg_alloc_done(g, mem->size, "vidmem");
+
+        return 0;
+
+fail_kfree:
+        nvgpu_kfree(g, mem->priv.sgt);
+fail_physfree:
+        nvgpu_free(&g->mm.vidmem.allocator, addr);
+        mem->size = 0;
+        return err;
+#else
+        return -ENOSYS;
+#endif
+}
+
+void nvgpu_dma_free_sys(struct gk20a *g, struct nvgpu_mem *mem)
+{
+        struct device *d = dev_from_gk20a(g);
+
+        g->dma_memory_used -= mem->aligned_size;
+
+        dma_dbg_free(g, mem->size, mem->priv.flags, "sysmem");
+
+        if (!(mem->mem_flags & NVGPU_MEM_FLAG_SHADOW_COPY) &&
+            !(mem->mem_flags & __NVGPU_MEM_FLAG_NO_DMA) &&
+            (mem->cpu_va || mem->priv.pages)) {
+                /*
+                 * Free side of WAR for bug 2040115.
+                 */
+                if (nvgpu_is_enabled(g, NVGPU_USE_COHERENT_SYSMEM))
+                        vunmap(mem->cpu_va);
+
+                if (mem->priv.flags) {
+                        NVGPU_DEFINE_DMA_ATTRS(dma_attrs);
+
+                        nvgpu_dma_flags_to_attrs(&dma_attrs, mem->priv.flags);
+
+                        if (mem->priv.flags & NVGPU_DMA_NO_KERNEL_MAPPING) {
+                                dma_free_attrs(d, mem->aligned_size, mem->priv.pages,
+                                        sg_dma_address(mem->priv.sgt->sgl),
+                                        NVGPU_DMA_ATTR(dma_attrs));
+                        } else {
+                                dma_free_attrs(d, mem->aligned_size, mem->cpu_va,
+                                        sg_dma_address(mem->priv.sgt->sgl),
+                                        NVGPU_DMA_ATTR(dma_attrs));
+                        }
+                } else {
+                        dma_free_coherent(d, mem->aligned_size, mem->cpu_va,
+                                        sg_dma_address(mem->priv.sgt->sgl));
+                }
+                mem->cpu_va = NULL;
+                mem->priv.pages = NULL;
+        }
+
+        /*
+         * When this flag is set we expect that pages is still populated but not
+         * by the DMA API.
+         */
+        if (mem->mem_flags & __NVGPU_MEM_FLAG_NO_DMA)
+                nvgpu_kfree(g, mem->priv.pages);
+
+        if ((mem->mem_flags & NVGPU_MEM_FLAG_FOREIGN_SGT) == 0 &&
+                        mem->priv.sgt != NULL) {
+                nvgpu_free_sgtable(g, &mem->priv.sgt);
+        }
+
+        dma_dbg_free_done(g, mem->size, "sysmem");
+
+        mem->size = 0;
+        mem->aligned_size = 0;
+        mem->aperture = APERTURE_INVALID;
+}
+
+void nvgpu_dma_free_vid(struct gk20a *g, struct nvgpu_mem *mem)
+{
+#if defined(CONFIG_GK20A_VIDMEM)
+        size_t mem_size = mem->size;
+
+        dma_dbg_free(g, mem->size, mem->priv.flags, "vidmem");
+
+        /* Sanity check - only this supported when allocating. */
+        WARN_ON(mem->priv.flags != NVGPU_DMA_NO_KERNEL_MAPPING);
+
+        if (mem->mem_flags & NVGPU_MEM_FLAG_USER_MEM) {
+                int err = nvgpu_vidmem_clear_list_enqueue(g, mem);
+
+                /*
+                 * If there's an error here then that means we can't clear the
+                 * vidmem. That's too bad; however, we still own the nvgpu_mem
+                 * buf so we have to free that.
+                 *
+                 * We don't need to worry about the vidmem allocator itself
+                 * since when that gets cleaned up in the driver shutdown path
+                 * all the outstanding allocs are force freed.
+                 */
+                if (err)
+                        nvgpu_kfree(g, mem);
+        } else {
+                nvgpu_memset(g, mem, 0, 0, mem->aligned_size);
+                nvgpu_free(mem->allocator,
+                           (u64)nvgpu_vidmem_get_page_alloc(mem->priv.sgt->sgl));
+                nvgpu_free_sgtable(g, &mem->priv.sgt);
+
+                mem->size = 0;
+                mem->aligned_size = 0;
+                mem->aperture = APERTURE_INVALID;
+        }
+
+        dma_dbg_free_done(g, mem_size, "vidmem");
+#endif
+}
+
+int nvgpu_get_sgtable_attrs(struct gk20a *g, struct sg_table **sgt,
+                      void *cpuva, u64 iova, size_t size, unsigned long flags)
+{
+        int err = 0;
+        struct sg_table *tbl;
+        NVGPU_DEFINE_DMA_ATTRS(dma_attrs);
+
+        tbl = nvgpu_kzalloc(g, sizeof(struct sg_table));
+        if (!tbl) {
+                err = -ENOMEM;
+                goto fail;
+        }
+
+        nvgpu_dma_flags_to_attrs(&dma_attrs, flags);
+        err = dma_get_sgtable_attrs(dev_from_gk20a(g), tbl, cpuva, iova,
+                                        size, NVGPU_DMA_ATTR(dma_attrs));
+        if (err)
+                goto fail;
+
+        sg_dma_address(tbl->sgl) = iova;
+        *sgt = tbl;
+
+        return 0;
+
+fail:
+        if (tbl)
+                nvgpu_kfree(g, tbl);
+
+        return err;
+}
+
+int nvgpu_get_sgtable(struct gk20a *g, struct sg_table **sgt,
+                      void *cpuva, u64 iova, size_t size)
+{
+        return nvgpu_get_sgtable_attrs(g, sgt, cpuva, iova, size, 0);
+}
+
+int nvgpu_get_sgtable_from_pages(struct gk20a *g, struct sg_table **sgt,
+                                 struct page **pages, u64 iova, size_t size)
+{
+        int err = 0;
+        struct sg_table *tbl;
+
+        tbl = nvgpu_kzalloc(g, sizeof(struct sg_table));
+        if (!tbl) {
+                err = -ENOMEM;
+                goto fail;
+        }
+
+        err = sg_alloc_table_from_pages(tbl, pages,
+                                        DIV_ROUND_UP(size, PAGE_SIZE),
+                                        0, size, GFP_KERNEL);
+        if (err)
+                goto fail;
+
+        sg_dma_address(tbl->sgl) = iova;
+        *sgt = tbl;
+
+        return 0;
+
+fail:
+        if (tbl)
+                nvgpu_kfree(g, tbl);
+
+        return err;
+}
+
+void nvgpu_free_sgtable(struct gk20a *g, struct sg_table **sgt)
+{
+        sg_free_table(*sgt);
+        nvgpu_kfree(g, *sgt);
+        *sgt = NULL;
+}
+
+bool nvgpu_iommuable(struct gk20a *g)
+{
+#ifdef CONFIG_TEGRA_GK20A
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        /*
+         * Check against the nvgpu device to see if it's been marked as
+         * IOMMU'able.
+         */
+        if (!device_is_iommuable(l->dev))
+                return false;
+#endif
+
+        return true;
+}
diff --git a/include/os/linux/log.c b/include/os/linux/log.c
new file mode 100644
index 0000000..bd9f67d
--- /dev/null
+++ b/include/os/linux/log.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+
+#include <nvgpu/log.h>
+#include <nvgpu/gk20a.h>
+
+#include "platform_gk20a.h"
+#include "os_linux.h"
+
+/*
+ * Define a length for log buffers. This is the buffer that the 'fmt, ...' part
+ * of __nvgpu_do_log_print() prints into. This buffer lives on the stack so it
+ * needs to not be overly sized since we have limited kernel stack space. But at
+ * the same time we don't want it to be restrictive either.
+ */
+#define LOG_BUFFER_LENGTH       160
+
+/*
+ * Annoying quirk of Linux: this has to be a string literal since the printk()
+ * function and friends use the preprocessor to concatenate stuff to the start
+ * of this string when printing.
+ */
+#define LOG_FMT                 "nvgpu: %s %33s:%-4d [%s]  %s\n"
+
+static const char *log_types[] = {
+        "ERR",
+        "WRN",
+        "DBG",
+        "INFO",
+};
+
+int nvgpu_log_mask_enabled(struct gk20a *g, u64 log_mask)
+{
+        return !!(g->log_mask & log_mask);
+}
+
+static inline const char *nvgpu_log_name(struct gk20a *g)
+{
+        return dev_name(dev_from_gk20a(g));
+}
+
+#ifdef CONFIG_GK20A_TRACE_PRINTK
+static void __nvgpu_trace_printk_log(u32 trace, const char *gpu_name,
+                                     const char *func_name, int line,
+                                     const char *log_type, const char *log)
+{
+        trace_printk(LOG_FMT, gpu_name, func_name, line, log_type, log);
+}
+#endif
+
+static void __nvgpu_really_print_log(u32 trace, const char *gpu_name,
+                                     const char *func_name, int line,
+                                     enum nvgpu_log_type type, const char *log)
+{
+        const char *name = gpu_name ? gpu_name : "";
+        const char *log_type = log_types[type];
+
+#ifdef CONFIG_GK20A_TRACE_PRINTK
+        if (trace)
+                return __nvgpu_trace_printk_log(trace, name, func_name,
+                                                line, log_type, log);
+#endif
+        switch (type) {
+        case NVGPU_DEBUG:
+                /*
+                 * We could use pr_debug() here but we control debug enablement
+                 * separately from the Linux kernel. Perhaps this is a bug in
+                 * nvgpu.
+                 */
+                pr_info(LOG_FMT, name, func_name, line, log_type, log);
+                break;
+        case NVGPU_INFO:
+                pr_info(LOG_FMT, name, func_name, line, log_type, log);
+                break;
+        case NVGPU_WARNING:
+                pr_warn(LOG_FMT, name, func_name, line, log_type, log);
+                break;
+        case NVGPU_ERROR:
+                pr_err(LOG_FMT, name, func_name, line, log_type, log);
+                break;
+        }
+}
+
+__attribute__((format (printf, 5, 6)))
+void __nvgpu_log_msg(struct gk20a *g, const char *func_name, int line,
+                     enum nvgpu_log_type type, const char *fmt, ...)
+{
+        char log[LOG_BUFFER_LENGTH];
+        va_list args;
+
+        va_start(args, fmt);
+        vsnprintf(log, LOG_BUFFER_LENGTH, fmt, args);
+        va_end(args);
+
+        __nvgpu_really_print_log(0, g ? nvgpu_log_name(g) : "",
+                                 func_name, line, type, log);
+}
+
+__attribute__((format (printf, 5, 6)))
+void __nvgpu_log_dbg(struct gk20a *g, u64 log_mask,
+                     const char *func_name, int line,
+                     const char *fmt, ...)
+{
+        char log[LOG_BUFFER_LENGTH];
+        va_list args;
+
+        if ((log_mask & g->log_mask) == 0)
+                return;
+
+        va_start(args, fmt);
+        vsnprintf(log, LOG_BUFFER_LENGTH, fmt, args);
+        va_end(args);
+
+        __nvgpu_really_print_log(g->log_trace, nvgpu_log_name(g),
+                                 func_name, line, NVGPU_DEBUG, log);
+}
diff --git a/include/os/linux/ltc.c b/include/os/linux/ltc.c
new file mode 100644
index 0000000..baeb20b
--- /dev/null
+++ b/include/os/linux/ltc.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/ltc.h>
+#include <nvgpu/dma.h>
+#include <nvgpu/nvgpu_mem.h>
+#include <nvgpu/gk20a.h>
+
+#include "gk20a/gr_gk20a.h"
+
+int nvgpu_ltc_alloc_cbc(struct gk20a *g, size_t compbit_backing_size,
+                        bool vidmem_alloc)
+{
+        struct gr_gk20a *gr = &g->gr;
+        unsigned long flags = 0;
+
+        if (nvgpu_mem_is_valid(&gr->compbit_store.mem))
+                return 0;
+
+        if (vidmem_alloc) {
+                /*
+                 * Backing store MUST be physically contiguous and allocated in
+                 * one chunk
+                 * Vidmem allocation API does not support FORCE_CONTIGUOUS like
+                 * flag to allocate contiguous memory
+                 * But this allocation will happen in vidmem bootstrap allocator
+                 * which always allocates contiguous memory
+                 */
+                return nvgpu_dma_alloc_vid(g,
+                                         compbit_backing_size,
+                                         &gr->compbit_store.mem);
+        } else {
+                if (!nvgpu_iommuable(g))
+                        flags = NVGPU_DMA_FORCE_CONTIGUOUS;
+
+                return nvgpu_dma_alloc_flags_sys(g,
+                                         flags,
+                                         compbit_backing_size,
+                                         &gr->compbit_store.mem);
+        }
+}
diff --git a/include/os/linux/module.c b/include/os/linux/module.c
new file mode 100644
index 0000000..807df2c
--- /dev/null
+++ b/include/os/linux/module.c
@@ -0,0 +1,1529 @@
+/*
+ * GK20A Graphics
+ *
+ * Copyright (c) 2011-2020, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/interrupt.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+#include <linux/reboot.h>
+#include <linux/notifier.h>
+#include <linux/platform/tegra/common.h>
+#include <linux/pci.h>
+
+#include <uapi/linux/nvgpu.h>
+#include <dt-bindings/soc/gm20b-fuse.h>
+#include <dt-bindings/soc/gp10b-fuse.h>
+#include <dt-bindings/soc/gv11b-fuse.h>
+
+#include <soc/tegra/fuse.h>
+
+#include <nvgpu/hal_init.h>
+#include <nvgpu/dma.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/nvgpu_common.h>
+#include <nvgpu/soc.h>
+#include <nvgpu/enabled.h>
+#include <nvgpu/debug.h>
+#include <nvgpu/ctxsw_trace.h>
+#include <nvgpu/vidmem.h>
+#include <nvgpu/sim.h>
+#include <nvgpu/clk_arb.h>
+#include <nvgpu/timers.h>
+#include <nvgpu/channel.h>
+
+#include "platform_gk20a.h"
+#include "sysfs.h"
+#include "vgpu/vgpu_linux.h"
+#include "scale.h"
+#include "pci.h"
+#include "module.h"
+#include "module_usermode.h"
+#include "intr.h"
+#include "ioctl.h"
+#include "ioctl_ctrl.h"
+
+#include "os_linux.h"
+#include "os_ops.h"
+#include "ctxsw_trace.h"
+#include "driver_common.h"
+#include "channel.h"
+#include "debug_pmgr.h"
+
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+#include "cde.h"
+#endif
+
+#define CLASS_NAME "nvidia-gpu"
+/* TODO: Change to e.g. "nvidia-gpu%s" once we have symlinks in place. */
+
+#define GK20A_WAIT_FOR_IDLE_MS  2000
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/gk20a.h>
+
+static int nvgpu_kernel_shutdown_notification(struct notifier_block *nb,
+                                        unsigned long event, void *unused)
+{
+        struct gk20a *g = container_of(nb, struct gk20a, nvgpu_reboot_nb);
+
+        __nvgpu_set_enabled(g, NVGPU_KERNEL_IS_DYING, true);
+        return NOTIFY_DONE;
+}
+
+struct device_node *nvgpu_get_node(struct gk20a *g)
+{
+        struct device *dev = dev_from_gk20a(g);
+
+        if (dev_is_pci(dev)) {
+                struct pci_bus *bus = to_pci_dev(dev)->bus;
+
+                while (!pci_is_root_bus(bus))
+                        bus = bus->parent;
+
+                return bus->bridge->parent->of_node;
+        }
+
+        return dev->of_node;
+}
+
+void gk20a_busy_noresume(struct gk20a *g)
+{
+        pm_runtime_get_noresume(dev_from_gk20a(g));
+}
+
+/*
+ * Check if the device can go busy.
+ */
+static int nvgpu_can_busy(struct gk20a *g)
+{
+        /* Can't do anything if the system is rebooting/shutting down. */
+        if (nvgpu_is_enabled(g, NVGPU_KERNEL_IS_DYING))
+                return 0;
+
+        /* Can't do anything if the driver is restarting. */
+        if (nvgpu_is_enabled(g, NVGPU_DRIVER_IS_DYING))
+                return 0;
+
+        return 1;
+}
+
+int gk20a_busy(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        int ret = 0;
+        struct device *dev;
+
+        if (!g)
+                return -ENODEV;
+
+        atomic_inc(&g->usage_count.atomic_var);
+
+        down_read(&l->busy_lock);
+
+        if (!nvgpu_can_busy(g)) {
+                ret = -ENODEV;
+                atomic_dec(&g->usage_count.atomic_var);
+                goto fail;
+        }
+
+        dev = dev_from_gk20a(g);
+
+        if (pm_runtime_enabled(dev)) {
+                /* Increment usage count and attempt to resume device */
+                ret = pm_runtime_get_sync(dev);
+                if (ret < 0) {
+                        /* Mark suspended so runtime pm will retry later */
+                        pm_runtime_set_suspended(dev);
+                        pm_runtime_put_noidle(dev);
+                        atomic_dec(&g->usage_count.atomic_var);
+                        goto fail;
+                }
+        } else {
+                ret = gk20a_gpu_is_virtual(dev) ?
+                        vgpu_pm_finalize_poweron(dev) :
+                        gk20a_pm_finalize_poweron(dev);
+                if (ret) {
+                        atomic_dec(&g->usage_count.atomic_var);
+                        goto fail;
+                }
+        }
+
+fail:
+        up_read(&l->busy_lock);
+
+        return ret < 0 ? ret : 0;
+}
+
+void gk20a_idle_nosuspend(struct gk20a *g)
+{
+        pm_runtime_put_noidle(dev_from_gk20a(g));
+}
+
+void gk20a_idle(struct gk20a *g)
+{
+        struct device *dev;
+
+        atomic_dec(&g->usage_count.atomic_var);
+
+        dev = dev_from_gk20a(g);
+
+        if (!(dev && nvgpu_can_busy(g)))
+                return;
+
+        if (pm_runtime_enabled(dev)) {
+                pm_runtime_mark_last_busy(dev);
+                pm_runtime_put_sync_autosuspend(dev);
+        }
+}
+
+/*
+ * Undoes gk20a_lockout_registers().
+ */
+static int gk20a_restore_registers(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        l->regs = l->regs_saved;
+        l->bar1 = l->bar1_saved;
+
+        nvgpu_restore_usermode_registers(g);
+
+        return 0;
+}
+
+int nvgpu_finalize_poweron_linux(struct nvgpu_os_linux *l)
+{
+        struct gk20a *g = &l->g;
+        int err;
+
+        if (l->init_done)
+                return 0;
+
+        err = nvgpu_init_channel_support_linux(l);
+        if (err) {
+                nvgpu_err(g, "failed to init linux channel support");
+                return err;
+        }
+
+        if (l->ops.clk.init_debugfs) {
+                err = l->ops.clk.init_debugfs(g);
+                if (err) {
+                        nvgpu_err(g, "failed to init linux clk debugfs");
+                        return err;
+                }
+        }
+
+        if (l->ops.therm.init_debugfs) {
+                err = l->ops.therm.init_debugfs(g);
+                if (err) {
+                        nvgpu_err(g, "failed to init linux therm debugfs");
+                        return err;
+                }
+        }
+
+        if (l->ops.fecs_trace.init_debugfs) {
+                err = l->ops.fecs_trace.init_debugfs(g);
+                if (err) {
+                        nvgpu_err(g, "failed to init linux fecs trace debugfs");
+                        return err;
+                }
+        }
+
+        err = nvgpu_pmgr_init_debugfs_linux(l);
+        if (err) {
+                nvgpu_err(g, "failed to init linux pmgr debugfs");
+                return err;
+        }
+
+        l->init_done = true;
+
+        return 0;
+}
+
+bool gk20a_check_poweron(struct gk20a *g)
+{
+        bool ret;
+
+        nvgpu_mutex_acquire(&g->power_lock);
+        ret = g->power_on;
+        nvgpu_mutex_release(&g->power_lock);
+
+        return ret;
+}
+
+int gk20a_pm_finalize_poweron(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        int err = 0;
+
+        nvgpu_log_fn(g, " ");
+
+        nvgpu_mutex_acquire(&g->power_lock);
+
+        if (g->power_on)
+                goto done;
+
+        trace_gk20a_finalize_poweron(dev_name(dev));
+
+        /* Increment platform power refcount */
+        if (platform->busy) {
+                err = platform->busy(dev);
+                if (err < 0) {
+                        nvgpu_err(g, "failed to poweron platform dependency");
+                        goto done;
+                }
+        }
+
+        err = gk20a_restore_registers(g);
+        if (err)
+                goto done;
+
+        nvgpu_restore_usermode_for_poweron(g);
+
+        /* Enable interrupt workqueue */
+        if (!l->nonstall_work_queue) {
+                l->nonstall_work_queue = alloc_workqueue("%s",
+                                                WQ_HIGHPRI, 1, "mc_nonstall");
+                INIT_WORK(&l->nonstall_fn_work, nvgpu_intr_nonstall_cb);
+        }
+
+        err = nvgpu_detect_chip(g);
+        if (err)
+                goto done;
+
+        if (g->sim) {
+                if (g->sim->sim_init_late)
+                        g->sim->sim_init_late(g);
+        }
+
+        err = gk20a_finalize_poweron(g);
+        if (err)
+                goto done;
+
+        err = nvgpu_init_os_linux_ops(l);
+        if (err)
+                goto done;
+
+        err = nvgpu_finalize_poweron_linux(l);
+        if (err)
+                goto done;
+
+        nvgpu_init_mm_ce_context(g);
+
+        nvgpu_vidmem_thread_unpause(&g->mm);
+
+        /* Initialise scaling: it will initialize scaling drive only once */
+        if (IS_ENABLED(CONFIG_GK20A_DEVFREQ) &&
+                        nvgpu_platform_is_silicon(g)) {
+                gk20a_scale_init(dev);
+                if (platform->initscale)
+                        platform->initscale(dev);
+        }
+
+        trace_gk20a_finalize_poweron_done(dev_name(dev));
+
+        enable_irq(g->irq_stall);
+        if (g->irq_stall != g->irq_nonstall)
+                enable_irq(g->irq_nonstall);
+        g->irqs_enabled = 1;
+
+        gk20a_scale_resume(dev_from_gk20a(g));
+
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        if (platform->has_cde)
+                gk20a_init_cde_support(l);
+#endif
+
+        err = gk20a_sched_ctrl_init(g);
+        if (err) {
+                nvgpu_err(g, "failed to init sched control");
+                goto done;
+        }
+
+        g->sw_ready = true;
+
+done:
+        if (err)
+                g->power_on = false;
+
+        nvgpu_mutex_release(&g->power_lock);
+        return err;
+}
+
+/*
+ * Locks out the driver from accessing GPU registers. This prevents access to
+ * thse registers after the GPU has been clock or power gated. This should help
+ * find annoying bugs where register reads and writes are silently dropped
+ * after the GPU has been turned off. On older chips these reads and writes can
+ * also lock the entire CPU up.
+ */
+static int gk20a_lockout_registers(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        l->regs = NULL;
+        l->bar1 = NULL;
+
+        nvgpu_lockout_usermode_registers(g);
+
+        return 0;
+}
+
+static int gk20a_pm_prepare_poweroff(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+#endif
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        bool irqs_enabled;
+        int ret = 0;
+
+        nvgpu_log_fn(g, " ");
+
+        nvgpu_mutex_acquire(&g->power_lock);
+
+        if (!g->power_on)
+                goto done;
+
+        /* disable IRQs and wait for completion */
+        irqs_enabled = g->irqs_enabled;
+        if (irqs_enabled) {
+                disable_irq(g->irq_stall);
+                if (g->irq_stall != g->irq_nonstall)
+                        disable_irq(g->irq_nonstall);
+                g->irqs_enabled = 0;
+        }
+
+        gk20a_scale_suspend(dev);
+
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        gk20a_cde_suspend(l);
+#endif
+
+        ret = gk20a_prepare_poweroff(g);
+        if (ret)
+                goto error;
+
+        /* Decrement platform power refcount */
+        if (platform->idle)
+                platform->idle(dev);
+
+        /* Stop CPU from accessing the GPU registers. */
+        gk20a_lockout_registers(g);
+
+        nvgpu_hide_usermode_for_poweroff(g);
+        nvgpu_mutex_release(&g->power_lock);
+        return 0;
+
+error:
+        /* re-enabled IRQs if previously enabled */
+        if (irqs_enabled) {
+                enable_irq(g->irq_stall);
+                if (g->irq_stall != g->irq_nonstall)
+                        enable_irq(g->irq_nonstall);
+                g->irqs_enabled = 1;
+        }
+
+        gk20a_scale_resume(dev);
+done:
+        nvgpu_mutex_release(&g->power_lock);
+
+        return ret;
+}
+
+static struct of_device_id tegra_gk20a_of_match[] = {
+#ifdef CONFIG_TEGRA_GK20A
+        { .compatible = "nvidia,tegra210-gm20b",
+                .data = &gm20b_tegra_platform },
+        { .compatible = "nvidia,tegra186-gp10b",
+                .data = &gp10b_tegra_platform },
+        { .compatible = "nvidia,gv11b",
+                .data = &gv11b_tegra_platform },
+#ifdef CONFIG_TEGRA_GR_VIRTUALIZATION
+        { .compatible = "nvidia,gv11b-vgpu",
+                .data = &gv11b_vgpu_tegra_platform},
+#endif
+#ifdef CONFIG_TEGRA_GR_VIRTUALIZATION
+        { .compatible = "nvidia,tegra124-gk20a-vgpu",
+                .data = &vgpu_tegra_platform },
+#endif
+#endif
+
+        { },
+};
+MODULE_DEVICE_TABLE(of, tegra_gk20a_of_match);
+
+#ifdef CONFIG_PM
+/**
+ * __gk20a_do_idle() - force the GPU to idle and railgate
+ *
+ * In success, this call MUST be balanced by caller with __gk20a_do_unidle()
+ *
+ * Acquires two locks : &l->busy_lock and &platform->railgate_lock
+ * In success, we hold these locks and return
+ * In failure, we release these locks and return
+ */
+int __gk20a_do_idle(struct gk20a *g, bool force_reset)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        struct nvgpu_timeout timeout;
+        int ref_cnt;
+        int target_ref_cnt = 0;
+        bool is_railgated;
+        int err = 0;
+
+        /*
+         * Hold back deterministic submits and changes to deterministic
+         * channels - this must be outside the power busy locks.
+         */
+        gk20a_channel_deterministic_idle(g);
+
+        /* acquire busy lock to block other busy() calls */
+        down_write(&l->busy_lock);
+
+        /* acquire railgate lock to prevent unrailgate in midst of do_idle() */
+        nvgpu_mutex_acquire(&platform->railgate_lock);
+
+        /* check if it is already railgated ? */
+        if (platform->is_railgated(dev))
+                return 0;
+
+        /*
+         * release railgate_lock, prevent suspend by incrementing usage counter,
+         * re-acquire railgate_lock
+         */
+        nvgpu_mutex_release(&platform->railgate_lock);
+        pm_runtime_get_sync(dev);
+
+        /*
+         * One refcount taken in this API
+         * If User disables rail gating, we take one more
+         * extra refcount
+         */
+        if (nvgpu_is_enabled(g, NVGPU_CAN_RAILGATE))
+                target_ref_cnt = 1;
+        else
+                target_ref_cnt = 2;
+        nvgpu_mutex_acquire(&platform->railgate_lock);
+
+        nvgpu_timeout_init(g, &timeout, GK20A_WAIT_FOR_IDLE_MS,
+                           NVGPU_TIMER_CPU_TIMER);
+
+        /* check and wait until GPU is idle (with a timeout) */
+        do {
+                nvgpu_usleep_range(1000, 1100);
+                ref_cnt = atomic_read(&dev->power.usage_count);
+        } while (ref_cnt != target_ref_cnt && !nvgpu_timeout_expired(&timeout));
+
+        if (ref_cnt != target_ref_cnt) {
+                nvgpu_err(g, "failed to idle - refcount %d != target_ref_cnt",
+                        ref_cnt);
+                goto fail_drop_usage_count;
+        }
+
+        /* check if global force_reset flag is set */
+        force_reset |= platform->force_reset_in_do_idle;
+
+        nvgpu_timeout_init(g, &timeout, GK20A_WAIT_FOR_IDLE_MS,
+                           NVGPU_TIMER_CPU_TIMER);
+
+        if (nvgpu_is_enabled(g, NVGPU_CAN_RAILGATE) && !force_reset) {
+                /*
+                 * Case 1 : GPU railgate is supported
+                 *
+                 * if GPU is now idle, we will have only one ref count,
+                 * drop this ref which will rail gate the GPU
+                 */
+                pm_runtime_put_sync(dev);
+
+                /* add sufficient delay to allow GPU to rail gate */
+                nvgpu_msleep(g->railgate_delay);
+
+                /* check in loop if GPU is railgated or not */
+                do {
+                        nvgpu_usleep_range(1000, 1100);
+                        is_railgated = platform->is_railgated(dev);
+                } while (!is_railgated && !nvgpu_timeout_expired(&timeout));
+
+                if (is_railgated) {
+                        return 0;
+                } else {
+                        nvgpu_err(g, "failed to idle in timeout");
+                        goto fail_timeout;
+                }
+        } else {
+                /*
+                 * Case 2 : GPU railgate is not supported or we explicitly
+                 * do not want to depend on runtime PM
+                 *
+                 * if GPU is now idle, call prepare_poweroff() to save the
+                 * state and then do explicit railgate
+                 *
+                 * __gk20a_do_unidle() needs to unrailgate, call
+                 * finalize_poweron(), and then call pm_runtime_put_sync()
+                 * to balance the GPU usage counter
+                 */
+
+                /* Save the GPU state */
+                err = gk20a_pm_prepare_poweroff(dev);
+                if (err)
+                        goto fail_drop_usage_count;
+
+                /* railgate GPU */
+                platform->railgate(dev);
+
+                nvgpu_udelay(10);
+
+                g->forced_reset = true;
+                return 0;
+        }
+
+fail_drop_usage_count:
+        pm_runtime_put_noidle(dev);
+fail_timeout:
+        nvgpu_mutex_release(&platform->railgate_lock);
+        up_write(&l->busy_lock);
+        gk20a_channel_deterministic_unidle(g);
+        return -EBUSY;
+}
+
+/**
+ * gk20a_do_idle() - wrap up for __gk20a_do_idle() to be called
+ * from outside of GPU driver
+ *
+ * In success, this call MUST be balanced by caller with gk20a_do_unidle()
+ */
+static int gk20a_do_idle(void *_g)
+{
+        struct gk20a *g = (struct gk20a *)_g;
+
+        return __gk20a_do_idle(g, true);
+}
+
+/**
+ * __gk20a_do_unidle() - unblock all the tasks blocked by __gk20a_do_idle()
+ */
+int __gk20a_do_unidle(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        int err;
+
+        if (g->forced_reset) {
+                /*
+                 * If we did a forced-reset/railgate
+                 * then unrailgate the GPU here first
+                 */
+                platform->unrailgate(dev);
+
+                /* restore the GPU state */
+                err = gk20a_pm_finalize_poweron(dev);
+                if (err)
+                        return err;
+
+                /* balance GPU usage counter */
+                pm_runtime_put_sync(dev);
+
+                g->forced_reset = false;
+        }
+
+        /* release the lock and open up all other busy() calls */
+        nvgpu_mutex_release(&platform->railgate_lock);
+        up_write(&l->busy_lock);
+
+        gk20a_channel_deterministic_unidle(g);
+
+        return 0;
+}
+
+/**
+ * gk20a_do_unidle() - wrap up for __gk20a_do_unidle()
+ */
+static int gk20a_do_unidle(void *_g)
+{
+        struct gk20a *g = (struct gk20a *)_g;
+
+        return __gk20a_do_unidle(g);
+}
+#endif
+
+void __iomem *nvgpu_devm_ioremap_resource(struct platform_device *dev, int i,
+                                          struct resource **out)
+{
+        struct resource *r = platform_get_resource(dev, IORESOURCE_MEM, i);
+
+        if (!r)
+                return NULL;
+        if (out)
+                *out = r;
+        return devm_ioremap_resource(&dev->dev, r);
+}
+
+void __iomem *nvgpu_devm_ioremap(struct device *dev, resource_size_t offset,
+                                 resource_size_t size)
+{
+        return devm_ioremap(dev, offset, size);
+}
+
+u64 nvgpu_resource_addr(struct platform_device *dev, int i)
+{
+        struct resource *r = platform_get_resource(dev, IORESOURCE_MEM, i);
+
+        if (!r)
+                return 0;
+
+        return r->start;
+}
+
+static irqreturn_t gk20a_intr_isr_stall(int irq, void *dev_id)
+{
+        struct gk20a *g = dev_id;
+
+        return nvgpu_intr_stall(g);
+}
+
+static irqreturn_t gk20a_intr_isr_nonstall(int irq, void *dev_id)
+{
+        struct gk20a *g = dev_id;
+
+        return nvgpu_intr_nonstall(g);
+}
+
+static irqreturn_t gk20a_intr_thread_stall(int irq, void *dev_id)
+{
+        struct gk20a *g = dev_id;
+
+        return nvgpu_intr_thread_stall(g);
+}
+
+void gk20a_remove_support(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct sim_nvgpu_linux *sim_linux;
+
+        tegra_unregister_idle_unidle(gk20a_do_idle);
+
+        nvgpu_kfree(g, g->dbg_regops_tmp_buf);
+
+        nvgpu_remove_channel_support_linux(l);
+
+        if (g->pmu.remove_support)
+                g->pmu.remove_support(&g->pmu);
+
+        if (g->acr.remove_support != NULL) {
+                g->acr.remove_support(&g->acr);
+        }
+
+        if (g->gr.remove_support)
+                g->gr.remove_support(&g->gr);
+
+        if (g->mm.remove_ce_support)
+                g->mm.remove_ce_support(&g->mm);
+
+        if (g->fifo.remove_support)
+                g->fifo.remove_support(&g->fifo);
+
+        if (g->mm.remove_support)
+                g->mm.remove_support(&g->mm);
+
+        if (g->sim) {
+                sim_linux = container_of(g->sim, struct sim_nvgpu_linux, sim);
+                if (g->sim->remove_support)
+                        g->sim->remove_support(g);
+                if (sim_linux->remove_support_linux)
+                        sim_linux->remove_support_linux(g);
+        }
+
+        nvgpu_remove_usermode_support(g);
+
+        nvgpu_free_enabled_flags(g);
+
+        gk20a_lockout_registers(g);
+}
+
+static int gk20a_init_support(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct gk20a *g = get_gk20a(dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        int err = -ENOMEM;
+
+        tegra_register_idle_unidle(gk20a_do_idle, gk20a_do_unidle, g);
+
+        l->regs = nvgpu_devm_ioremap_resource(pdev,
+                                              GK20A_BAR0_IORESOURCE_MEM,
+                                              &l->reg_mem);
+        if (IS_ERR(l->regs)) {
+                nvgpu_err(g, "failed to remap gk20a registers");
+                err = PTR_ERR(l->regs);
+                goto fail;
+        }
+
+        l->regs_bus_addr = nvgpu_resource_addr(pdev,
+                        GK20A_BAR0_IORESOURCE_MEM);
+        if (!l->regs_bus_addr) {
+                nvgpu_err(g, "failed to read register bus offset");
+                err = -ENODEV;
+                goto fail;
+        }
+
+        l->bar1 = nvgpu_devm_ioremap_resource(pdev,
+                                              GK20A_BAR1_IORESOURCE_MEM,
+                                              &l->bar1_mem);
+        if (IS_ERR(l->bar1)) {
+                nvgpu_err(g, "failed to remap gk20a bar1");
+                err = PTR_ERR(l->bar1);
+                goto fail;
+        }
+
+        err = nvgpu_init_sim_support_linux(g, pdev);
+        if (err)
+                goto fail;
+        err = nvgpu_init_sim_support(g);
+        if (err)
+                goto fail_sim;
+
+        nvgpu_init_usermode_support(g);
+        return 0;
+
+fail_sim:
+        nvgpu_remove_sim_support_linux(g);
+fail:
+        if (l->regs)
+                l->regs = NULL;
+
+        if (l->bar1)
+                l->bar1 = NULL;
+
+        return err;
+}
+
+static int gk20a_pm_railgate(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        int ret = 0;
+        struct gk20a *g = get_gk20a(dev);
+
+        /* return early if platform didn't implement railgate */
+        if (!platform->railgate)
+                return 0;
+
+        /* if platform is already railgated, then just return */
+        if (platform->is_railgated && platform->is_railgated(dev))
+                return ret;
+
+#ifdef CONFIG_DEBUG_FS
+        g->pstats.last_rail_gate_start = jiffies;
+
+        if (g->pstats.railgating_cycle_count >= 1)
+                g->pstats.total_rail_ungate_time_ms =
+                        g->pstats.total_rail_ungate_time_ms +
+                        jiffies_to_msecs(g->pstats.last_rail_gate_start -
+                                        g->pstats.last_rail_ungate_complete);
+#endif
+
+        ret = platform->railgate(dev);
+        if (ret) {
+                nvgpu_err(g, "failed to railgate platform, err=%d", ret);
+                return ret;
+        }
+
+#ifdef CONFIG_DEBUG_FS
+        g->pstats.last_rail_gate_complete = jiffies;
+#endif
+        ret = tegra_fuse_clock_disable();
+        if (ret)
+                nvgpu_err(g, "failed to disable tegra fuse clock, err=%d", ret);
+
+        return ret;
+}
+
+static int gk20a_pm_unrailgate(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        int ret = 0;
+        struct gk20a *g = get_gk20a(dev);
+
+        /* return early if platform didn't implement unrailgate */
+        if (!platform->unrailgate)
+                return 0;
+
+        ret = tegra_fuse_clock_enable();
+        if (ret) {
+                nvgpu_err(g, "failed to enable tegra fuse clock, err=%d", ret);
+                return ret;
+        }
+#ifdef CONFIG_DEBUG_FS
+        g->pstats.last_rail_ungate_start = jiffies;
+        if (g->pstats.railgating_cycle_count >= 1)
+                g->pstats.total_rail_gate_time_ms =
+                        g->pstats.total_rail_gate_time_ms +
+                        jiffies_to_msecs(g->pstats.last_rail_ungate_start -
+                                g->pstats.last_rail_gate_complete);
+
+        g->pstats.railgating_cycle_count++;
+#endif
+
+        trace_gk20a_pm_unrailgate(dev_name(dev));
+
+        nvgpu_mutex_acquire(&platform->railgate_lock);
+        ret = platform->unrailgate(dev);
+        nvgpu_mutex_release(&platform->railgate_lock);
+
+#ifdef CONFIG_DEBUG_FS
+        g->pstats.last_rail_ungate_complete = jiffies;
+#endif
+
+        return ret;
+}
+
+/*
+ * Remove association of the driver with OS interrupt handler
+ */
+void nvgpu_free_irq(struct gk20a *g)
+{
+        struct device *dev = dev_from_gk20a(g);
+
+        devm_free_irq(dev, g->irq_stall, g);
+        if (g->irq_stall != g->irq_nonstall)
+                devm_free_irq(dev, g->irq_nonstall, g);
+}
+
+/*
+ * Idle the GPU in preparation of shutdown/remove.
+ * gk20a_driver_start_unload() does not idle the GPU, but instead changes the SW
+ * state to prevent further activity on the driver SW side.
+ * On driver removal quiesce() should be called after start_unload()
+ */
+int nvgpu_quiesce(struct gk20a *g)
+{
+        int err;
+        struct device *dev = dev_from_gk20a(g);
+
+        if (g->power_on) {
+                err = gk20a_wait_for_idle(g);
+                if (err) {
+                        nvgpu_err(g, "failed to idle GPU, err=%d", err);
+                        return err;
+                }
+
+                err = gk20a_fifo_disable_all_engine_activity(g, true);
+                if (err) {
+                        nvgpu_err(g,
+                                "failed to disable engine activity, err=%d",
+                                err);
+                return err;
+                }
+
+                err = gk20a_fifo_wait_engine_idle(g);
+                if (err) {
+                        nvgpu_err(g, "failed to idle engines, err=%d",
+                                err);
+                        return err;
+                }
+        }
+
+        if (gk20a_gpu_is_virtual(dev))
+                err = vgpu_pm_prepare_poweroff(dev);
+        else
+                err = gk20a_pm_prepare_poweroff(dev);
+
+        if (err)
+                nvgpu_err(g, "failed to prepare for poweroff, err=%d",
+                        err);
+
+        return err;
+}
+
+static void gk20a_pm_shutdown(struct platform_device *pdev)
+{
+        struct gk20a_platform *platform = platform_get_drvdata(pdev);
+        struct gk20a *g = platform->g;
+        int err;
+
+        nvgpu_info(g, "shutting down");
+
+        /* vgpu has nothing to clean up currently */
+        if (gk20a_gpu_is_virtual(&pdev->dev))
+                return;
+
+        if (!g->power_on)
+                goto finish;
+
+        gk20a_driver_start_unload(g);
+
+        /* If GPU is already railgated,
+         * just prevent more requests, and return */
+        if (platform->is_railgated && platform->is_railgated(&pdev->dev)) {
+                __pm_runtime_disable(&pdev->dev, false);
+                nvgpu_info(g, "already railgated, shut down complete");
+                return;
+        }
+
+        /* Prevent more requests by disabling Runtime PM */
+        __pm_runtime_disable(&pdev->dev, false);
+
+        err = nvgpu_quiesce(g);
+        if (err)
+                goto finish;
+
+        err = gk20a_pm_railgate(&pdev->dev);
+        if (err)
+                nvgpu_err(g, "failed to railgate, err=%d", err);
+
+finish:
+        nvgpu_info(g, "shut down complete");
+}
+
+#ifdef CONFIG_PM
+static int gk20a_pm_runtime_resume(struct device *dev)
+{
+        int err = 0;
+
+        err = gk20a_pm_unrailgate(dev);
+        if (err)
+                goto fail;
+
+        if (gk20a_gpu_is_virtual(dev))
+                err = vgpu_pm_finalize_poweron(dev);
+        else
+                err = gk20a_pm_finalize_poweron(dev);
+        if (err)
+                goto fail_poweron;
+
+        return 0;
+
+fail_poweron:
+        gk20a_pm_railgate(dev);
+fail:
+        return err;
+}
+
+static int gk20a_pm_runtime_suspend(struct device *dev)
+{
+        int err = 0;
+        struct gk20a *g = get_gk20a(dev);
+
+        if (!g)
+                return 0;
+
+        if (gk20a_gpu_is_virtual(dev))
+                err = vgpu_pm_prepare_poweroff(dev);
+        else
+                err = gk20a_pm_prepare_poweroff(dev);
+        if (err) {
+                nvgpu_err(g, "failed to power off, err=%d", err);
+                goto fail;
+        }
+
+        err = gk20a_pm_railgate(dev);
+        if (err)
+                goto fail;
+
+        return 0;
+
+fail:
+        gk20a_pm_finalize_poweron(dev);
+        pm_runtime_mark_last_busy(dev);
+        return err;
+}
+
+static int gk20a_pm_suspend(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        struct gk20a *g = get_gk20a(dev);
+        int ret = 0;
+        int usage_count;
+        struct nvgpu_timeout timeout;
+
+        if (!g->power_on) {
+                if (platform->suspend)
+                        ret = platform->suspend(dev);
+
+                if (ret)
+                        return ret;
+
+                if (!pm_runtime_enabled(dev))
+                        ret = gk20a_pm_railgate(dev);
+
+                return ret;
+        }
+
+        nvgpu_timeout_init(g, &timeout, GK20A_WAIT_FOR_IDLE_MS,
+                           NVGPU_TIMER_CPU_TIMER);
+        /*
+         * Hold back deterministic submits and changes to deterministic
+         * channels - this must be outside the power busy locks.
+         */
+        gk20a_channel_deterministic_idle(g);
+
+        /* check and wait until GPU is idle (with a timeout) */
+        do {
+                nvgpu_usleep_range(1000, 1100);
+                usage_count = nvgpu_atomic_read(&g->usage_count);
+        } while (usage_count != 0 && !nvgpu_timeout_expired(&timeout));
+
+        if (usage_count != 0) {
+                nvgpu_err(g, "failed to idle - usage_count %d", usage_count);
+                ret = -EINVAL;
+                goto fail_idle;
+        }
+
+        ret = gk20a_pm_runtime_suspend(dev);
+        if (ret)
+                goto fail_idle;
+
+        if (platform->suspend)
+                ret = platform->suspend(dev);
+        if (ret)
+                goto fail_suspend;
+
+        g->suspended = true;
+
+        return 0;
+
+fail_suspend:
+        gk20a_pm_runtime_resume(dev);
+fail_idle:
+        gk20a_channel_deterministic_unidle(g);
+        return ret;
+}
+
+static int gk20a_pm_resume(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        struct gk20a *g = get_gk20a(dev);
+        int ret = 0;
+
+        if (!g->suspended) {
+                if (platform->resume)
+                        ret = platform->resume(dev);
+                if (ret)
+                        return ret;
+
+                if (!pm_runtime_enabled(dev))
+                        ret = gk20a_pm_unrailgate(dev);
+
+                return ret;
+        }
+
+        if (platform->resume)
+                ret = platform->resume(dev);
+        if (ret)
+                return ret;
+
+        ret = gk20a_pm_runtime_resume(dev);
+        if (ret)
+                return ret;
+
+        g->suspended = false;
+
+        gk20a_channel_deterministic_unidle(g);
+
+        return ret;
+}
+
+static const struct dev_pm_ops gk20a_pm_ops = {
+        .runtime_resume = gk20a_pm_runtime_resume,
+        .runtime_suspend = gk20a_pm_runtime_suspend,
+        .resume = gk20a_pm_resume,
+        .suspend = gk20a_pm_suspend,
+};
+#endif
+
+static int gk20a_pm_init(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        int err = 0;
+
+        nvgpu_log_fn(g, " ");
+
+        /*
+         * Initialise pm runtime. For railgate disable
+         * case, set autosuspend delay to negative which
+         * will suspend runtime pm
+         */
+        if (g->railgate_delay && nvgpu_is_enabled(g, NVGPU_CAN_RAILGATE))
+                pm_runtime_set_autosuspend_delay(dev,
+                                 g->railgate_delay);
+        else
+                pm_runtime_set_autosuspend_delay(dev, -1);
+
+        pm_runtime_use_autosuspend(dev);
+        pm_runtime_enable(dev);
+
+        return err;
+}
+
+static int gk20a_pm_deinit(struct device *dev)
+{
+        pm_runtime_dont_use_autosuspend(dev);
+        pm_runtime_disable(dev);
+        return 0;
+}
+
+/*
+ * Start the process for unloading the driver. Set NVGPU_DRIVER_IS_DYING.
+ */
+void gk20a_driver_start_unload(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        nvgpu_log(g, gpu_dbg_shutdown, "Driver is now going down!\n");
+
+        down_write(&l->busy_lock);
+        __nvgpu_set_enabled(g, NVGPU_DRIVER_IS_DYING, true);
+        /* GR SW ready needs to be invalidated at this time with the busy lock
+         * held to prevent a racing condition on the gr/mm code */
+        g->gr.sw_ready = false;
+        g->sw_ready = false;
+        up_write(&l->busy_lock);
+
+        if (g->is_virtual)
+                return;
+
+        gk20a_wait_for_idle(g);
+
+        nvgpu_wait_for_deferred_interrupts(g);
+
+        if (l->nonstall_work_queue) {
+                cancel_work_sync(&l->nonstall_fn_work);
+                destroy_workqueue(l->nonstall_work_queue);
+                l->nonstall_work_queue = NULL;
+        }
+}
+
+static inline void set_gk20a(struct platform_device *pdev, struct gk20a *gk20a)
+{
+        gk20a_get_platform(&pdev->dev)->g = gk20a;
+}
+
+static int nvgpu_read_fuse_overrides(struct gk20a *g)
+{
+        struct device_node *np = nvgpu_get_node(g);
+        struct gk20a_platform *platform = dev_get_drvdata(dev_from_gk20a(g));
+        u32 *fuses;
+        int count, i;
+
+        if (!np) /* may be pcie device */
+                return 0;
+
+        count = of_property_count_elems_of_size(np, "fuse-overrides", 8);
+        if (count <= 0)
+                return count;
+
+        fuses = nvgpu_kmalloc(g, sizeof(u32) * count * 2);
+        if (!fuses)
+                return -ENOMEM;
+        of_property_read_u32_array(np, "fuse-overrides", fuses, count * 2);
+        for (i = 0; i < count; i++) {
+                u32 fuse, value;
+
+                fuse = fuses[2 * i];
+                value = fuses[2 * i + 1];
+                switch (fuse) {
+                case GM20B_FUSE_OPT_TPC_DISABLE:
+                        g->tpc_fs_mask_user = ~value;
+                        break;
+                case GP10B_FUSE_OPT_ECC_EN:
+                        g->gr.fecs_feature_override_ecc_val = value;
+                        break;
+                case GV11B_FUSE_OPT_TPC_DISABLE:
+                        if (platform->set_tpc_pg_mask != NULL)
+                                platform->set_tpc_pg_mask(dev_from_gk20a(g),
+                                                                value);
+                        break;
+                default:
+                        nvgpu_err(g, "ignore unknown fuse override %08x", fuse);
+                        break;
+                }
+        }
+
+        nvgpu_kfree(g, fuses);
+
+        return 0;
+}
+
+static int gk20a_probe(struct platform_device *dev)
+{
+        struct nvgpu_os_linux *l = NULL;
+        struct gk20a *gk20a;
+        int err;
+        struct gk20a_platform *platform = NULL;
+        struct device_node *np;
+
+        if (dev->dev.of_node) {
+                const struct of_device_id *match;
+
+                match = of_match_device(tegra_gk20a_of_match, &dev->dev);
+                if (match)
+                        platform = (struct gk20a_platform *)match->data;
+        } else
+                platform = (struct gk20a_platform *)dev->dev.platform_data;
+
+        if (!platform) {
+                dev_err(&dev->dev, "no platform data\n");
+                return -ENODATA;
+        }
+
+        platform_set_drvdata(dev, platform);
+
+        if (gk20a_gpu_is_virtual(&dev->dev))
+                return vgpu_probe(dev);
+
+        l = kzalloc(sizeof(*l), GFP_KERNEL);
+        if (!l) {
+                dev_err(&dev->dev, "couldn't allocate gk20a support");
+                return -ENOMEM;
+        }
+
+        hash_init(l->ecc_sysfs_stats_htable);
+
+        gk20a = &l->g;
+
+        nvgpu_log_fn(gk20a, " ");
+
+        nvgpu_init_gk20a(gk20a);
+        set_gk20a(dev, gk20a);
+        l->dev = &dev->dev;
+        gk20a->log_mask = NVGPU_DEFAULT_DBG_MASK;
+
+        nvgpu_kmem_init(gk20a);
+
+        err = nvgpu_init_enabled_flags(gk20a);
+        if (err)
+                goto return_err;
+
+        np = nvgpu_get_node(gk20a);
+        if (of_dma_is_coherent(np)) {
+                __nvgpu_set_enabled(gk20a, NVGPU_USE_COHERENT_SYSMEM, true);
+                __nvgpu_set_enabled(gk20a, NVGPU_SUPPORT_IO_COHERENCE, true);
+        }
+
+        if (nvgpu_platform_is_simulation(gk20a))
+                __nvgpu_set_enabled(gk20a, NVGPU_IS_FMODEL, true);
+
+        gk20a->irq_stall = platform_get_irq(dev, 0);
+        gk20a->irq_nonstall = platform_get_irq(dev, 1);
+        if (gk20a->irq_stall < 0 || gk20a->irq_nonstall < 0) {
+                err = -ENXIO;
+                goto return_err;
+        }
+
+        err = devm_request_threaded_irq(&dev->dev,
+                        gk20a->irq_stall,
+                        gk20a_intr_isr_stall,
+                        gk20a_intr_thread_stall,
+                        0, "gk20a_stall", gk20a);
+        if (err) {
+                dev_err(&dev->dev,
+                        "failed to request stall intr irq @ %d\n",
+                                gk20a->irq_stall);
+                goto return_err;
+        }
+        err = devm_request_irq(&dev->dev,
+                        gk20a->irq_nonstall,
+                        gk20a_intr_isr_nonstall,
+                        0, "gk20a_nonstall", gk20a);
+        if (err) {
+                dev_err(&dev->dev,
+                        "failed to request non-stall intr irq @ %d\n",
+                                gk20a->irq_nonstall);
+                goto return_err;
+        }
+        disable_irq(gk20a->irq_stall);
+        if (gk20a->irq_stall != gk20a->irq_nonstall)
+                disable_irq(gk20a->irq_nonstall);
+
+        err = gk20a_init_support(dev);
+        if (err)
+                goto return_err;
+
+        err = nvgpu_read_fuse_overrides(gk20a);
+
+#ifdef CONFIG_RESET_CONTROLLER
+        platform->reset_control = devm_reset_control_get(&dev->dev, NULL);
+        if (IS_ERR(platform->reset_control))
+                platform->reset_control = NULL;
+#endif
+
+        err = nvgpu_probe(gk20a, "gpu.0", INTERFACE_NAME, &nvgpu_class);
+        if (err)
+                goto return_err;
+
+        err = gk20a_pm_init(&dev->dev);
+        if (err) {
+                dev_err(&dev->dev, "pm init failed");
+                goto return_err;
+        }
+
+        gk20a->nvgpu_reboot_nb.notifier_call =
+                nvgpu_kernel_shutdown_notification;
+        err = register_reboot_notifier(&gk20a->nvgpu_reboot_nb);
+        if (err)
+                goto return_err;
+
+        return 0;
+
+return_err:
+        nvgpu_free_enabled_flags(gk20a);
+
+        /*
+         * Last since the above allocs may use data structures in here.
+         */
+        nvgpu_kmem_fini(gk20a, NVGPU_KMEM_FINI_FORCE_CLEANUP);
+
+        kfree(l);
+
+        return err;
+}
+
+int nvgpu_remove(struct device *dev, struct class *class)
+{
+        struct gk20a *g = get_gk20a(dev);
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+#endif
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        int err;
+
+        nvgpu_log_fn(g, " ");
+
+        err = nvgpu_quiesce(g);
+        WARN(err, "gpu failed to idle during driver removal");
+
+        if (nvgpu_mem_is_valid(&g->syncpt_mem))
+                nvgpu_dma_free(g, &g->syncpt_mem);
+
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        if (platform->has_cde)
+                gk20a_cde_destroy(l);
+#endif
+
+#ifdef CONFIG_GK20A_CTXSW_TRACE
+        gk20a_ctxsw_trace_cleanup(g);
+#endif
+
+        gk20a_sched_ctrl_cleanup(g);
+
+        if (IS_ENABLED(CONFIG_GK20A_DEVFREQ))
+                gk20a_scale_exit(dev);
+
+        nvgpu_clk_arb_cleanup_arbiter(g);
+
+        gk20a_user_deinit(dev, class);
+
+        gk20a_debug_deinit(g);
+
+        nvgpu_remove_sysfs(dev);
+
+        if (platform->secure_buffer.destroy)
+                platform->secure_buffer.destroy(g,
+                                &platform->secure_buffer);
+
+        if (platform->remove)
+                platform->remove(dev);
+
+        nvgpu_mutex_destroy(&g->clk_arb_enable_lock);
+
+        nvgpu_log_fn(g, "removed");
+
+        return err;
+}
+
+static int __exit gk20a_remove(struct platform_device *pdev)
+{
+        int err;
+        struct device *dev = &pdev->dev;
+        struct gk20a *g = get_gk20a(dev);
+
+        if (gk20a_gpu_is_virtual(dev))
+                return vgpu_remove(pdev);
+
+        err = nvgpu_remove(dev, &nvgpu_class);
+
+        unregister_reboot_notifier(&g->nvgpu_reboot_nb);
+
+        set_gk20a(pdev, NULL);
+
+        gk20a_put(g);
+
+        gk20a_pm_deinit(dev);
+
+        return err;
+}
+
+static struct platform_driver gk20a_driver = {
+        .probe = gk20a_probe,
+        .remove = __exit_p(gk20a_remove),
+        .shutdown = gk20a_pm_shutdown,
+        .driver = {
+                .owner = THIS_MODULE,
+                .name = "gk20a",
+                .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+#ifdef CONFIG_OF
+                .of_match_table = tegra_gk20a_of_match,
+#endif
+#ifdef CONFIG_PM
+                .pm = &gk20a_pm_ops,
+#endif
+                .suppress_bind_attrs = true,
+        }
+};
+
+struct class nvgpu_class = {
+        .owner = THIS_MODULE,
+        .name = CLASS_NAME,
+};
+
+static int __init gk20a_init(void)
+{
+
+        int ret;
+
+        ret = class_register(&nvgpu_class);
+        if (ret)
+                return ret;
+
+        ret = nvgpu_pci_init();
+        if (ret)
+                return ret;
+
+        return platform_driver_register(&gk20a_driver);
+}
+
+static void __exit gk20a_exit(void)
+{
+        nvgpu_pci_exit();
+        platform_driver_unregister(&gk20a_driver);
+        class_unregister(&nvgpu_class);
+}
+
+MODULE_LICENSE("GPL v2");
+module_init(gk20a_init);
+module_exit(gk20a_exit);
diff --git a/include/os/linux/module.h b/include/os/linux/module.h
new file mode 100644
index 0000000..76c7274
--- /dev/null
+++ b/include/os/linux/module.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2011-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+#ifndef __NVGPU_COMMON_LINUX_MODULE_H__
+#define __NVGPU_COMMON_LINUX_MODULE_H__
+
+struct gk20a;
+struct device;
+struct nvgpu_os_linux;
+
+int gk20a_pm_finalize_poweron(struct device *dev);
+int nvgpu_finalize_poweron_linux(struct nvgpu_os_linux *l);
+void gk20a_remove_support(struct gk20a *g);
+void gk20a_driver_start_unload(struct gk20a *g);
+int nvgpu_quiesce(struct gk20a *g);
+int nvgpu_remove(struct device *dev, struct class *class);
+void nvgpu_free_irq(struct gk20a *g);
+struct device_node *nvgpu_get_node(struct gk20a *g);
+void __iomem *nvgpu_devm_ioremap_resource(struct platform_device *dev, int i,
+                struct resource **out);
+void __iomem *nvgpu_devm_ioremap(struct device *dev, resource_size_t offset,
+                resource_size_t size);
+u64 nvgpu_resource_addr(struct platform_device *dev, int i);
+extern struct class nvgpu_class;
+
+#endif
diff --git a/include/os/linux/module_usermode.c b/include/os/linux/module_usermode.c
new file mode 100644
index 0000000..ea01c1b
--- /dev/null
+++ b/include/os/linux/module_usermode.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <nvgpu/types.h>
+
+#include <nvgpu/hw/gv11b/hw_usermode_gv11b.h>
+
+#include "os_linux.h"
+
+/*
+ * Locks out the driver from accessing GPU registers. This prevents access to
+ * thse registers after the GPU has been clock or power gated. This should help
+ * find annoying bugs where register reads and writes are silently dropped
+ * after the GPU has been turned off. On older chips these reads and writes can
+ * also lock the entire CPU up.
+ */
+void nvgpu_lockout_usermode_registers(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        l->usermode_regs = NULL;
+}
+
+/*
+ * Undoes t19x_lockout_registers().
+ */
+void nvgpu_restore_usermode_registers(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        l->usermode_regs = l->usermode_regs_saved;
+}
+
+void nvgpu_remove_usermode_support(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        if (l->usermode_regs) {
+                l->usermode_regs = NULL;
+        }
+}
+
+void nvgpu_init_usermode_support(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        l->usermode_regs = l->regs + usermode_cfg0_r();
+        l->usermode_regs_saved = l->usermode_regs;
+}
diff --git a/include/os/linux/module_usermode.h b/include/os/linux/module_usermode.h
new file mode 100644
index 0000000..b17053c
--- /dev/null
+++ b/include/os/linux/module_usermode.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __NVGPU_MODULE_T19X_H__
+#define __NVGPU_MODULE_T19X_H__
+
+struct gk20a;
+
+void nvgpu_init_usermode_support(struct gk20a *g);
+void nvgpu_remove_usermode_support(struct gk20a *g);
+void nvgpu_lockout_usermode_registers(struct gk20a *g);
+void nvgpu_restore_usermode_registers(struct gk20a *g);
+
+#endif
diff --git a/include/os/linux/nvgpu_mem.c b/include/os/linux/nvgpu_mem.c
new file mode 100644
index 0000000..d6a3189
--- /dev/null
+++ b/include/os/linux/nvgpu_mem.c
@@ -0,0 +1,348 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <nvgpu/dma.h>
+#include <nvgpu/gmmu.h>
+#include <nvgpu/nvgpu_mem.h>
+#include <nvgpu/page_allocator.h>
+#include <nvgpu/log.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/enabled.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/vidmem.h>
+#include <nvgpu/gk20a.h>
+
+#include <nvgpu/linux/dma.h>
+
+#include <linux/vmalloc.h>
+#include <linux/dma-mapping.h>
+
+#include "os_linux.h"
+#include "dmabuf_vidmem.h"
+
+#include "gk20a/mm_gk20a.h"
+#include "platform_gk20a.h"
+
+static u64 __nvgpu_sgl_phys(struct gk20a *g, struct nvgpu_sgl *sgl)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        u64 ipa = sg_phys((struct scatterlist *)sgl);
+
+        if (platform->phys_addr)
+                return platform->phys_addr(g, ipa);
+
+        return ipa;
+}
+
+/*
+ * Obtain a SYSMEM address from a Linux SGL. This should eventually go away
+ * and/or become private to this file once all bad usages of Linux SGLs are
+ * cleaned up in the driver.
+ */
+u64 nvgpu_mem_get_addr_sgl(struct gk20a *g, struct scatterlist *sgl)
+{
+        if (nvgpu_is_enabled(g, NVGPU_MM_USE_PHYSICAL_SG) ||
+            !nvgpu_iommuable(g))
+                return g->ops.mm.gpu_phys_addr(g, NULL,
+                        __nvgpu_sgl_phys(g, (struct nvgpu_sgl *)sgl));
+
+        if (sg_dma_address(sgl) == 0)
+                return g->ops.mm.gpu_phys_addr(g, NULL,
+                        __nvgpu_sgl_phys(g, (struct nvgpu_sgl *)sgl));
+
+        if (sg_dma_address(sgl) == DMA_ERROR_CODE)
+                return 0;
+
+        return nvgpu_mem_iommu_translate(g, sg_dma_address(sgl));
+}
+
+/*
+ * Obtain the address the GPU should use from the %mem assuming this is a SYSMEM
+ * allocation.
+ */
+static u64 nvgpu_mem_get_addr_sysmem(struct gk20a *g, struct nvgpu_mem *mem)
+{
+        return nvgpu_mem_get_addr_sgl(g, mem->priv.sgt->sgl);
+}
+
+/*
+ * Return the base address of %mem. Handles whether this is a VIDMEM or SYSMEM
+ * allocation.
+ *
+ * Note: this API does not make sense to use for _VIDMEM_ buffers with greater
+ * than one scatterlist chunk. If there's more than one scatterlist chunk then
+ * the buffer will not be contiguous. As such the base address probably isn't
+ * very useful. This is true for SYSMEM as well, if there's no IOMMU.
+ *
+ * However! It _is_ OK to use this on discontiguous sysmem buffers _if_ there's
+ * an IOMMU present and enabled for the GPU.
+ *
+ * %attrs can be NULL. If it is not NULL then it may be inspected to determine
+ * if the address needs to be modified before writing into a PTE.
+ */
+u64 nvgpu_mem_get_addr(struct gk20a *g, struct nvgpu_mem *mem)
+{
+        struct nvgpu_page_alloc *alloc;
+
+        if (mem->aperture == APERTURE_SYSMEM)
+                return nvgpu_mem_get_addr_sysmem(g, mem);
+
+        /*
+         * Otherwise get the vidmem address.
+         */
+        alloc = mem->vidmem_alloc;
+
+        /* This API should not be used with > 1 chunks */
+        WARN_ON(alloc->nr_chunks != 1);
+
+        return alloc->base;
+}
+
+/*
+ * This should only be used on contiguous buffers regardless of whether
+ * there's an IOMMU present/enabled. This applies to both SYSMEM and
+ * VIDMEM.
+ */
+u64 nvgpu_mem_get_phys_addr(struct gk20a *g, struct nvgpu_mem *mem)
+{
+        /*
+         * For a VIDMEM buf, this is identical to simply get_addr() so just fall
+         * back to that.
+         */
+        if (mem->aperture == APERTURE_VIDMEM)
+                return nvgpu_mem_get_addr(g, mem);
+
+        return __nvgpu_sgl_phys(g, (struct nvgpu_sgl *)mem->priv.sgt->sgl);
+}
+
+/*
+ * Be careful how you use this! You are responsible for correctly freeing this
+ * memory.
+ */
+int nvgpu_mem_create_from_mem(struct gk20a *g,
+                              struct nvgpu_mem *dest, struct nvgpu_mem *src,
+                              u64 start_page, int nr_pages)
+{
+        int ret;
+        u64 start = start_page * PAGE_SIZE;
+        u64 size = nr_pages * PAGE_SIZE;
+        dma_addr_t new_iova;
+
+        if (src->aperture != APERTURE_SYSMEM)
+                return -EINVAL;
+
+        /* Some silly things a caller might do... */
+        if (size > src->size)
+                return -EINVAL;
+        if ((start + size) > src->size)
+                return -EINVAL;
+
+        dest->mem_flags = src->mem_flags | NVGPU_MEM_FLAG_SHADOW_COPY;
+        dest->aperture  = src->aperture;
+        dest->skip_wmb  = src->skip_wmb;
+        dest->size      = size;
+
+        /*
+         * Re-use the CPU mapping only if the mapping was made by the DMA API.
+         *
+         * Bug 2040115: the DMA API wrapper makes the mapping that we should
+         * re-use.
+         */
+        if (!(src->priv.flags & NVGPU_DMA_NO_KERNEL_MAPPING) ||
+            nvgpu_is_enabled(g, NVGPU_USE_COHERENT_SYSMEM))
+                dest->cpu_va = src->cpu_va + (PAGE_SIZE * start_page);
+
+        dest->priv.pages = src->priv.pages + start_page;
+        dest->priv.flags = src->priv.flags;
+
+        new_iova = sg_dma_address(src->priv.sgt->sgl) ?
+                sg_dma_address(src->priv.sgt->sgl) + start : 0;
+
+        /*
+         * Make a new SG table that is based only on the subset of pages that
+         * is passed to us. This table gets freed by the dma free routines.
+         */
+        if (src->priv.flags & NVGPU_DMA_NO_KERNEL_MAPPING)
+                ret = nvgpu_get_sgtable_from_pages(g, &dest->priv.sgt,
+                                                   src->priv.pages + start_page,
+                                                   new_iova, size);
+        else
+                ret = nvgpu_get_sgtable(g, &dest->priv.sgt, dest->cpu_va,
+                                        new_iova, size);
+
+        return ret;
+}
+
+int __nvgpu_mem_create_from_pages(struct gk20a *g, struct nvgpu_mem *dest,
+                                  struct page **pages, int nr_pages)
+{
+        struct sg_table *sgt;
+        struct page **our_pages =
+                nvgpu_kmalloc(g, sizeof(struct page *) * nr_pages);
+
+        if (!our_pages)
+                return -ENOMEM;
+
+        memcpy(our_pages, pages, sizeof(struct page *) * nr_pages);
+
+        if (nvgpu_get_sgtable_from_pages(g, &sgt, pages, 0,
+                                         nr_pages * PAGE_SIZE)) {
+                nvgpu_kfree(g, our_pages);
+                return -ENOMEM;
+        }
+
+        /*
+         * If we are making an SGT from physical pages we can be reasonably
+         * certain that this should bypass the SMMU - thus we set the DMA (aka
+         * IOVA) address to 0. This tells the GMMU mapping code to not make a
+         * mapping directed to the SMMU.
+         */
+        sg_dma_address(sgt->sgl) = 0;
+
+        dest->mem_flags  = __NVGPU_MEM_FLAG_NO_DMA;
+        dest->aperture   = APERTURE_SYSMEM;
+        dest->skip_wmb   = 0;
+        dest->size       = PAGE_SIZE * nr_pages;
+
+        dest->priv.flags = 0;
+        dest->priv.pages = our_pages;
+        dest->priv.sgt   = sgt;
+
+        return 0;
+}
+
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+int __nvgpu_mem_create_from_phys(struct gk20a *g, struct nvgpu_mem *dest,
+                                 u64 src_phys, int nr_pages)
+{
+        struct page **pages =
+                nvgpu_kmalloc(g, sizeof(struct page *) * nr_pages);
+        int i, ret = 0;
+
+        if (!pages)
+                return -ENOMEM;
+
+        for (i = 0; i < nr_pages; i++)
+                pages[i] = phys_to_page(src_phys + PAGE_SIZE * i);
+
+        ret = __nvgpu_mem_create_from_pages(g, dest, pages, nr_pages);
+        nvgpu_kfree(g, pages);
+
+        return ret;
+}
+#endif
+
+static struct nvgpu_sgl *nvgpu_mem_linux_sgl_next(struct nvgpu_sgl *sgl)
+{
+        return (struct nvgpu_sgl *)sg_next((struct scatterlist *)sgl);
+}
+
+static u64 nvgpu_mem_linux_sgl_phys(struct gk20a *g, struct nvgpu_sgl *sgl)
+{
+        return (u64)__nvgpu_sgl_phys(g, sgl);
+}
+
+static u64 nvgpu_mem_linux_sgl_dma(struct nvgpu_sgl *sgl)
+{
+        return (u64)sg_dma_address((struct scatterlist *)sgl);
+}
+
+static u64 nvgpu_mem_linux_sgl_length(struct nvgpu_sgl *sgl)
+{
+        return (u64)((struct scatterlist *)sgl)->length;
+}
+
+static u64 nvgpu_mem_linux_sgl_gpu_addr(struct gk20a *g,
+                                        struct nvgpu_sgl *sgl,
+                                        struct nvgpu_gmmu_attrs *attrs)
+{
+        if (sg_dma_address((struct scatterlist *)sgl) == 0)
+                return g->ops.mm.gpu_phys_addr(g, attrs,
+                                __nvgpu_sgl_phys(g, sgl));
+
+        if (sg_dma_address((struct scatterlist *)sgl) == DMA_ERROR_CODE)
+                return 0;
+
+        return nvgpu_mem_iommu_translate(g,
+                                sg_dma_address((struct scatterlist *)sgl));
+}
+
+static bool nvgpu_mem_linux_sgt_iommuable(struct gk20a *g,
+                                          struct nvgpu_sgt *sgt)
+{
+        if (nvgpu_is_enabled(g, NVGPU_MM_USE_PHYSICAL_SG))
+                return false;
+        return true;
+}
+
+static void nvgpu_mem_linux_sgl_free(struct gk20a *g, struct nvgpu_sgt *sgt)
+{
+        /*
+         * Free this SGT. All we do is free the passed SGT. The actual Linux
+         * SGT/SGL needs to be freed separately.
+         */
+        nvgpu_kfree(g, sgt);
+}
+
+static const struct nvgpu_sgt_ops nvgpu_linux_sgt_ops = {
+        .sgl_next      = nvgpu_mem_linux_sgl_next,
+        .sgl_phys      = nvgpu_mem_linux_sgl_phys,
+        .sgl_dma       = nvgpu_mem_linux_sgl_dma,
+        .sgl_length    = nvgpu_mem_linux_sgl_length,
+        .sgl_gpu_addr  = nvgpu_mem_linux_sgl_gpu_addr,
+        .sgt_iommuable = nvgpu_mem_linux_sgt_iommuable,
+        .sgt_free      = nvgpu_mem_linux_sgl_free,
+};
+
+static struct nvgpu_sgt *__nvgpu_mem_get_sgl_from_vidmem(
+        struct gk20a *g,
+        struct scatterlist *linux_sgl)
+{
+        struct nvgpu_page_alloc *vidmem_alloc;
+
+        vidmem_alloc = nvgpu_vidmem_get_page_alloc(linux_sgl);
+        if (!vidmem_alloc)
+                return NULL;
+
+        return &vidmem_alloc->sgt;
+}
+
+struct nvgpu_sgt *nvgpu_linux_sgt_create(struct gk20a *g, struct sg_table *sgt)
+{
+        struct nvgpu_sgt *nvgpu_sgt;
+        struct scatterlist *linux_sgl = sgt->sgl;
+
+        if (nvgpu_addr_is_vidmem_page_alloc(sg_dma_address(linux_sgl)))
+                return __nvgpu_mem_get_sgl_from_vidmem(g, linux_sgl);
+
+        nvgpu_sgt = nvgpu_kzalloc(g, sizeof(*nvgpu_sgt));
+        if (!nvgpu_sgt)
+                return NULL;
+
+        nvgpu_log(g, gpu_dbg_sgl, "Making Linux SGL!");
+
+        nvgpu_sgt->sgl = (struct nvgpu_sgl *)linux_sgl;
+        nvgpu_sgt->ops = &nvgpu_linux_sgt_ops;
+
+        return nvgpu_sgt;
+}
+
+struct nvgpu_sgt *nvgpu_sgt_create_from_mem(struct gk20a *g,
+                                            struct nvgpu_mem *mem)
+{
+        return nvgpu_linux_sgt_create(g, mem->priv.sgt);
+}
diff --git a/include/os/linux/nvhost.c b/include/os/linux/nvhost.c
new file mode 100644
index 0000000..a9341c7
--- /dev/null
+++ b/include/os/linux/nvhost.c
@@ -0,0 +1,295 @@
+/*
+ * Copyright (c) 2017-2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/nvhost.h>
+#include <linux/nvhost_t194.h>
+#include <uapi/linux/nvhost_ioctl.h>
+#include <linux/of_platform.h>
+
+#include <nvgpu/gk20a.h>
+#include <nvgpu/nvhost.h>
+#include <nvgpu/enabled.h>
+
+#include "nvhost_priv.h"
+
+#include "os_linux.h"
+#include "module.h"
+
+int nvgpu_get_nvhost_dev(struct gk20a *g)
+{
+        struct device_node *np = nvgpu_get_node(g);
+        struct platform_device *host1x_pdev = NULL;
+        const __be32 *host1x_ptr;
+
+        host1x_ptr = of_get_property(np, "nvidia,host1x", NULL);
+        if (host1x_ptr) {
+                struct device_node *host1x_node =
+                        of_find_node_by_phandle(be32_to_cpup(host1x_ptr));
+
+                host1x_pdev = of_find_device_by_node(host1x_node);
+                if (!host1x_pdev) {
+                        nvgpu_warn(g, "host1x device not available");
+                        return -EPROBE_DEFER;
+                }
+
+        } else {
+                if (nvgpu_has_syncpoints(g)) {
+                        nvgpu_warn(g, "host1x reference not found. assuming no syncpoints support");
+                        __nvgpu_set_enabled(g, NVGPU_HAS_SYNCPOINTS, false);
+                }
+                return 0;
+        }
+
+        g->nvhost_dev = nvgpu_kzalloc(g, sizeof(struct nvgpu_nvhost_dev));
+        if (!g->nvhost_dev)
+                return -ENOMEM;
+
+        g->nvhost_dev->host1x_pdev = host1x_pdev;
+
+        return 0;
+}
+
+void nvgpu_free_nvhost_dev(struct gk20a *g)
+{
+        nvgpu_kfree(g, g->nvhost_dev);
+}
+
+int nvgpu_nvhost_module_busy_ext(
+        struct nvgpu_nvhost_dev *nvhost_dev)
+{
+        return nvhost_module_busy_ext(nvhost_dev->host1x_pdev);
+}
+
+void nvgpu_nvhost_module_idle_ext(
+        struct nvgpu_nvhost_dev *nvhost_dev)
+{
+        nvhost_module_idle_ext(nvhost_dev->host1x_pdev);
+}
+
+void nvgpu_nvhost_debug_dump_device(
+        struct nvgpu_nvhost_dev *nvhost_dev)
+{
+        nvhost_debug_dump_device(nvhost_dev->host1x_pdev);
+}
+
+const char *nvgpu_nvhost_syncpt_get_name(
+        struct nvgpu_nvhost_dev *nvhost_dev, int id)
+{
+        return nvhost_syncpt_get_name(nvhost_dev->host1x_pdev, id);
+}
+
+bool nvgpu_nvhost_syncpt_is_valid_pt_ext(
+        struct nvgpu_nvhost_dev *nvhost_dev, u32 id)
+{
+        return nvhost_syncpt_is_valid_pt_ext(nvhost_dev->host1x_pdev, id);
+}
+
+int nvgpu_nvhost_syncpt_is_expired_ext(
+        struct nvgpu_nvhost_dev *nvhost_dev, u32 id, u32 thresh)
+{
+        return nvhost_syncpt_is_expired_ext(nvhost_dev->host1x_pdev,
+                        id, thresh);
+}
+
+u32 nvgpu_nvhost_syncpt_incr_max_ext(
+        struct nvgpu_nvhost_dev *nvhost_dev, u32 id, u32 incrs)
+{
+        return nvhost_syncpt_incr_max_ext(nvhost_dev->host1x_pdev, id, incrs);
+}
+
+int nvgpu_nvhost_intr_register_notifier(
+        struct nvgpu_nvhost_dev *nvhost_dev, u32 id, u32 thresh,
+        void (*callback)(void *, int), void *private_data)
+{
+        return nvhost_intr_register_notifier(nvhost_dev->host1x_pdev,
+                        id, thresh,
+                        callback, private_data);
+}
+
+void nvgpu_nvhost_syncpt_set_min_eq_max_ext(
+        struct nvgpu_nvhost_dev *nvhost_dev, u32 id)
+{
+        nvhost_syncpt_set_min_eq_max_ext(nvhost_dev->host1x_pdev, id);
+}
+
+void nvgpu_nvhost_syncpt_put_ref_ext(
+        struct nvgpu_nvhost_dev *nvhost_dev, u32 id)
+{
+        nvhost_syncpt_put_ref_ext(nvhost_dev->host1x_pdev, id);
+}
+
+u32 nvgpu_nvhost_get_syncpt_host_managed(
+        struct nvgpu_nvhost_dev *nvhost_dev,
+        u32 param, const char *syncpt_name)
+{
+        return nvhost_get_syncpt_host_managed(nvhost_dev->host1x_pdev,
+                        param, syncpt_name);
+}
+
+u32 nvgpu_nvhost_get_syncpt_client_managed(
+        struct nvgpu_nvhost_dev *nvhost_dev,
+        const char *syncpt_name)
+{
+        return nvhost_get_syncpt_client_managed(nvhost_dev->host1x_pdev,
+                        syncpt_name);
+}
+
+int nvgpu_nvhost_syncpt_wait_timeout_ext(
+        struct nvgpu_nvhost_dev *nvhost_dev, u32 id,
+        u32 thresh, u32 timeout, u32 *value, struct timespec *ts)
+{
+        return nvhost_syncpt_wait_timeout_ext(nvhost_dev->host1x_pdev,
+                id, thresh, timeout, value, ts);
+}
+
+int nvgpu_nvhost_syncpt_read_ext_check(
+        struct nvgpu_nvhost_dev *nvhost_dev, u32 id, u32 *val)
+{
+        return nvhost_syncpt_read_ext_check(nvhost_dev->host1x_pdev, id, val);
+}
+
+u32 nvgpu_nvhost_syncpt_read_maxval(
+        struct nvgpu_nvhost_dev *nvhost_dev, u32 id)
+{
+        return nvhost_syncpt_read_maxval(nvhost_dev->host1x_pdev, id);
+}
+
+void nvgpu_nvhost_syncpt_set_safe_state(
+        struct nvgpu_nvhost_dev *nvhost_dev, u32 id)
+{
+        u32 val;
+
+        /*
+         * Add large number of increments to current value
+         * so that all waiters on this syncpoint are released
+         *
+         * We don't expect any case where more than 0x10000 increments
+         * are pending
+         */
+        val = nvhost_syncpt_read_minval(nvhost_dev->host1x_pdev, id);
+        val += 0x10000;
+
+        nvhost_syncpt_set_minval(nvhost_dev->host1x_pdev, id, val);
+        nvhost_syncpt_set_maxval(nvhost_dev->host1x_pdev, id, val);
+}
+
+int nvgpu_nvhost_create_symlink(struct gk20a *g)
+{
+        struct device *dev = dev_from_gk20a(g);
+        int err = 0;
+
+        if (g->nvhost_dev &&
+                        (dev->parent != &g->nvhost_dev->host1x_pdev->dev)) {
+                err = sysfs_create_link(&g->nvhost_dev->host1x_pdev->dev.kobj,
+                                &dev->kobj,
+                                dev_name(dev));
+        }
+
+        return err;
+}
+
+void nvgpu_nvhost_remove_symlink(struct gk20a *g)
+{
+        struct device *dev = dev_from_gk20a(g);
+
+        if (g->nvhost_dev &&
+                        (dev->parent != &g->nvhost_dev->host1x_pdev->dev)) {
+                sysfs_remove_link(&g->nvhost_dev->host1x_pdev->dev.kobj,
+                                  dev_name(dev));
+        }
+}
+
+#ifdef CONFIG_SYNC
+u32 nvgpu_nvhost_sync_pt_id(struct sync_pt *pt)
+{
+        return nvhost_sync_pt_id(pt);
+}
+
+u32 nvgpu_nvhost_sync_pt_thresh(struct sync_pt *pt)
+{
+        return nvhost_sync_pt_thresh(pt);
+}
+
+struct sync_fence *nvgpu_nvhost_sync_fdget(int fd)
+{
+        return nvhost_sync_fdget(fd);
+}
+
+int nvgpu_nvhost_sync_num_pts(struct sync_fence *fence)
+{
+        return nvhost_sync_num_pts(fence);
+}
+
+struct sync_fence *nvgpu_nvhost_sync_create_fence(
+        struct nvgpu_nvhost_dev *nvhost_dev,
+        u32 id, u32 thresh, const char *name)
+{
+        struct nvhost_ctrl_sync_fence_info pt = {
+                .id = id,
+                .thresh = thresh,
+        };
+
+        return nvhost_sync_create_fence(nvhost_dev->host1x_pdev, &pt, 1, name);
+}
+#endif /* CONFIG_SYNC */
+
+#ifdef CONFIG_TEGRA_T19X_GRHOST
+int nvgpu_nvhost_syncpt_unit_interface_get_aperture(
+                struct nvgpu_nvhost_dev *nvhost_dev,
+                u64 *base, size_t *size)
+{
+        return nvhost_syncpt_unit_interface_get_aperture(
+                nvhost_dev->host1x_pdev, (phys_addr_t *)base, size);
+}
+
+u32 nvgpu_nvhost_syncpt_unit_interface_get_byte_offset(u32 syncpt_id)
+{
+        return nvhost_syncpt_unit_interface_get_byte_offset(syncpt_id);
+}
+
+int nvgpu_nvhost_syncpt_init(struct gk20a *g)
+{
+        int err = 0;
+
+        if (!nvgpu_has_syncpoints(g))
+                return -ENOSYS;
+
+        err = nvgpu_get_nvhost_dev(g);
+        if (err) {
+                nvgpu_err(g, "host1x device not available");
+                __nvgpu_set_enabled(g, NVGPU_HAS_SYNCPOINTS, false);
+                return -ENOSYS;
+        }
+
+        err = nvgpu_nvhost_syncpt_unit_interface_get_aperture(
+                        g->nvhost_dev,
+                        &g->syncpt_unit_base,
+                        &g->syncpt_unit_size);
+        if (err) {
+                nvgpu_err(g, "Failed to get syncpt interface");
+                __nvgpu_set_enabled(g, NVGPU_HAS_SYNCPOINTS, false);
+                return -ENOSYS;
+        }
+
+        g->syncpt_size =
+                        nvgpu_nvhost_syncpt_unit_interface_get_byte_offset(1);
+        nvgpu_info(g, "syncpt_unit_base %llx syncpt_unit_size %zx size %x\n",
+                        g->syncpt_unit_base, g->syncpt_unit_size,
+                        g->syncpt_size);
+
+        return 0;
+}
+#endif
diff --git a/include/os/linux/nvhost_priv.h b/include/os/linux/nvhost_priv.h
new file mode 100644
index 0000000..c03390a
--- /dev/null
+++ b/include/os/linux/nvhost_priv.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __NVGPU_NVHOST_PRIV_H__
+#define __NVGPU_NVHOST_PRIV_H__
+
+struct nvgpu_nvhost_dev {
+        struct platform_device *host1x_pdev;
+};
+
+#endif /* __NVGPU_NVHOST_PRIV_H__ */
diff --git a/include/os/linux/nvidia_p2p.c b/include/os/linux/nvidia_p2p.c
new file mode 100644
index 0000000..87db8c5
--- /dev/null
+++ b/include/os/linux/nvidia_p2p.c
@@ -0,0 +1,299 @@
+/*
+ * Copyright (c) 2018-2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/slab.h>
+#include <linux/nv-p2p.h>
+
+static void nvidia_p2p_mn_release(struct mmu_notifier *mn,
+        struct mm_struct *mm)
+{
+        struct nvidia_p2p_page_table *page_table = container_of(mn,
+                                                struct nvidia_p2p_page_table,
+                                                mn);
+
+        page_table->free_callback(page_table->data);
+}
+
+static void nvidia_p2p_mn_invl_range_start(struct mmu_notifier *mn,
+        struct mm_struct *mm, unsigned long start, unsigned long end)
+{
+        struct nvidia_p2p_page_table *page_table = container_of(mn,
+                                                struct nvidia_p2p_page_table,
+                                                mn);
+        u64 vaddr = 0;
+        u64 size = 0;
+
+        vaddr = page_table->vaddr;
+        size = page_table->size;
+
+        if (vaddr >= start && vaddr <= end) {
+                mmu_notifier_unregister_no_release(&page_table->mn, page_table->mm);
+                page_table->free_callback(page_table->data);
+        }
+}
+
+static struct mmu_notifier_ops nvidia_p2p_mmu_ops = {
+        .release                = nvidia_p2p_mn_release,
+        .invalidate_range_start = nvidia_p2p_mn_invl_range_start,
+};
+
+int nvidia_p2p_get_pages(u64 vaddr, u64 size,
+                struct nvidia_p2p_page_table **page_table,
+                void (*free_callback)(void *data), void *data)
+{
+        int ret = 0;
+        int user_pages = 0;
+        int locked = 0;
+        int nr_pages = size >> PAGE_SHIFT;
+        struct page **pages;
+
+        if (nr_pages <= 0) {
+                return -EINVAL;
+        }
+
+        *page_table = kzalloc(sizeof(**page_table), GFP_KERNEL);
+        if (!*page_table) {
+                return -ENOMEM;
+        }
+
+        pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
+        if (!pages) {
+                ret = -ENOMEM;
+                goto free_page_table;
+        }
+        down_read(&current->mm->mmap_sem);
+        locked = 1;
+        user_pages = get_user_pages_locked(vaddr & PAGE_MASK, nr_pages,
+                        FOLL_WRITE | FOLL_FORCE,
+                        pages, &locked);
+        up_read(&current->mm->mmap_sem);
+        if (user_pages != nr_pages) {
+                ret = user_pages < 0 ? user_pages : -ENOMEM;
+                goto free_pages;
+        }
+
+        (*page_table)->version = NVIDIA_P2P_PAGE_TABLE_VERSION;
+        (*page_table)->pages = pages;
+        (*page_table)->entries = user_pages;
+        (*page_table)->page_size = NVIDIA_P2P_PAGE_SIZE_4KB;
+        (*page_table)->size = size;
+
+        (*page_table)->mn.ops = &nvidia_p2p_mmu_ops;
+        (*page_table)->mm = current->mm;
+        (*page_table)->free_callback = free_callback;
+        (*page_table)->data = data;
+        (*page_table)->vaddr = vaddr;
+        mutex_init(&(*page_table)->lock);
+        (*page_table)->mapped = NVIDIA_P2P_PINNED;
+
+        ret = mmu_notifier_register(&(*page_table)->mn, (*page_table)->mm);
+        if (ret) {
+                goto free_pages;
+        }
+
+        return 0;
+free_pages:
+        while (--user_pages >= 0) {
+                put_page(pages[user_pages]);
+        }
+        kfree(pages);
+free_page_table:
+        kfree(*page_table);
+        *page_table = NULL;
+        return ret;
+}
+EXPORT_SYMBOL(nvidia_p2p_get_pages);
+
+int nvidia_p2p_put_pages(struct nvidia_p2p_page_table *page_table)
+{
+        if (!page_table) {
+                return -EINVAL;
+        }
+
+        mmu_notifier_unregister(&page_table->mn, page_table->mm);
+
+        return 0;
+}
+EXPORT_SYMBOL(nvidia_p2p_put_pages);
+
+int nvidia_p2p_free_page_table(struct nvidia_p2p_page_table *page_table)
+{
+        int user_pages = 0;
+        struct page **pages = NULL;
+
+        if (!page_table) {
+                return 0;
+        }
+
+        mutex_lock(&page_table->lock);
+
+        if (page_table->mapped & NVIDIA_P2P_MAPPED) {
+                WARN(1, "Attempting to free unmapped pages");
+        }
+
+        if (page_table->mapped & NVIDIA_P2P_PINNED) {
+                pages = page_table->pages;
+                user_pages = page_table->entries;
+
+                while (--user_pages >= 0) {
+                        put_page(pages[user_pages]);
+                }
+
+                kfree(pages);
+                page_table->mapped &= (u32)~NVIDIA_P2P_PINNED;
+        }
+
+        mutex_unlock(&page_table->lock);
+
+        return 0;
+}
+EXPORT_SYMBOL(nvidia_p2p_free_page_table);
+
+int nvidia_p2p_dma_map_pages(struct device *dev,
+                struct nvidia_p2p_page_table *page_table,
+                struct nvidia_p2p_dma_mapping **dma_mapping,
+                enum dma_data_direction direction)
+{
+        struct sg_table *sgt = NULL;
+        struct scatterlist *sg;
+        struct page **pages = NULL;
+        u32 nr_pages = 0;
+        int ret = 0;
+        int i, count;
+
+        if (!page_table) {
+                return -EINVAL;
+        }
+
+        mutex_lock(&page_table->lock);
+
+        pages = page_table->pages;
+        nr_pages = page_table->entries;
+        if (nr_pages <= 0) {
+                mutex_unlock(&page_table->lock);
+                return -EINVAL;
+        }
+
+        *dma_mapping = kzalloc(sizeof(**dma_mapping), GFP_KERNEL);
+        if (!*dma_mapping) {
+                mutex_unlock(&page_table->lock);
+                return -ENOMEM;
+        }
+        sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
+        if (!sgt) {
+                ret = -ENOMEM;
+                goto free_dma_mapping;
+        }
+        ret = sg_alloc_table_from_pages(sgt, pages,
+                                nr_pages, 0, page_table->size, GFP_KERNEL);
+        if (ret) {
+                goto free_sgt;
+        }
+
+        (*dma_mapping)->version = NVIDIA_P2P_DMA_MAPPING_VERSION;
+        (*dma_mapping)->sgt = sgt;
+        (*dma_mapping)->dev = dev;
+        (*dma_mapping)->direction = direction;
+        (*dma_mapping)->page_table = page_table;
+
+        count = dma_map_sg(dev, sgt->sgl, sgt->nents, direction);
+        if (count < 1) {
+                goto free_sg_table;
+        }
+
+        (*dma_mapping)->entries = count;
+
+        (*dma_mapping)->hw_address = kcalloc(count, sizeof(u64), GFP_KERNEL);
+        if (!((*dma_mapping)->hw_address)) {
+                ret = -ENOMEM;
+                goto unmap_sg;
+        }
+        (*dma_mapping)->hw_len = kcalloc(count, sizeof(u64), GFP_KERNEL);
+        if (!((*dma_mapping)->hw_len)) {
+                ret = -ENOMEM;
+                goto free_hw_address;
+        }
+
+        for_each_sg(sgt->sgl, sg, count, i) {
+                (*dma_mapping)->hw_address[i] = sg_dma_address(sg);
+                (*dma_mapping)->hw_len[i] = sg_dma_len(sg);
+        }
+        (*dma_mapping)->page_table->mapped |= NVIDIA_P2P_MAPPED;
+        mutex_unlock(&page_table->lock);
+
+        return 0;
+free_hw_address:
+        kfree((*dma_mapping)->hw_address);
+unmap_sg:
+        dma_unmap_sg(dev, sgt->sgl,
+                sgt->nents, direction);
+free_sg_table:
+        sg_free_table(sgt);
+free_sgt:
+        kfree(sgt);
+free_dma_mapping:
+        kfree(*dma_mapping);
+        *dma_mapping = NULL;
+        mutex_unlock(&page_table->lock);
+
+        return ret;
+}
+EXPORT_SYMBOL(nvidia_p2p_dma_map_pages);
+
+int nvidia_p2p_dma_unmap_pages(struct nvidia_p2p_dma_mapping *dma_mapping)
+{
+        struct nvidia_p2p_page_table *page_table = NULL;
+
+        if (!dma_mapping) {
+                return -EINVAL;
+        }
+
+        page_table = dma_mapping->page_table;
+        if (!page_table) {
+                return -EFAULT;
+        }
+
+        mutex_lock(&page_table->lock);
+        if (page_table->mapped & NVIDIA_P2P_MAPPED) {
+                kfree(dma_mapping->hw_len);
+                kfree(dma_mapping->hw_address);
+                if (dma_mapping->entries)
+                        dma_unmap_sg(dma_mapping->dev,
+                                dma_mapping->sgt->sgl,
+                                dma_mapping->sgt->nents,
+                                dma_mapping->direction);
+                sg_free_table(dma_mapping->sgt);
+                kfree(dma_mapping->sgt);
+                kfree(dma_mapping);
+                page_table->mapped &= (u32)~NVIDIA_P2P_MAPPED;
+        }
+        mutex_unlock(&page_table->lock);
+
+        return 0;
+}
+EXPORT_SYMBOL(nvidia_p2p_dma_unmap_pages);
+
+int nvidia_p2p_free_dma_mapping(struct nvidia_p2p_dma_mapping *dma_mapping)
+{
+        return nvidia_p2p_dma_unmap_pages(dma_mapping);
+}
+EXPORT_SYMBOL(nvidia_p2p_free_dma_mapping);
diff --git a/include/os/linux/nvlink.c b/include/os/linux/nvlink.c
new file mode 100644
index 0000000..dd7c02c
--- /dev/null
+++ b/include/os/linux/nvlink.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef CONFIG_TEGRA_NVLINK
+#include <linux/platform/tegra/tegra-nvlink.h>
+#endif
+
+#include <nvgpu/gk20a.h>
+#include <nvgpu/nvlink.h>
+#include <nvgpu/enabled.h>
+#include "module.h"
+
+#ifdef CONFIG_TEGRA_NVLINK
+int nvgpu_nvlink_read_dt_props(struct gk20a *g)
+{
+        struct device_node *np;
+        struct nvlink_device *ndev = g->nvlink.priv;
+        u32 local_dev_id;
+        u32 local_link_id;
+        u32 remote_dev_id;
+        u32 remote_link_id;
+        bool is_master;
+
+        /* Parse DT */
+        np = nvgpu_get_node(g);
+        if (!np)
+                goto fail;
+
+        np = of_get_child_by_name(np, "nvidia,nvlink");
+        if (!np)
+                goto fail;
+
+        np = of_get_child_by_name(np, "endpoint");
+        if (!np)
+                goto fail;
+
+        /* Parse DT structure to detect endpoint topology */
+        of_property_read_u32(np, "local_dev_id", &local_dev_id);
+        of_property_read_u32(np, "local_link_id", &local_link_id);
+        of_property_read_u32(np, "remote_dev_id", &remote_dev_id);
+        of_property_read_u32(np, "remote_link_id", &remote_link_id);
+        is_master = of_property_read_bool(np, "is_master");
+
+        /* Check that we are in dGPU mode */
+        if (local_dev_id != NVLINK_ENDPT_GV100) {
+                nvgpu_err(g, "Local nvlink device is not dGPU");
+                return -EINVAL;
+        }
+
+        ndev->is_master = is_master;
+        ndev->device_id = local_dev_id;
+        ndev->link.link_id = local_link_id;
+        ndev->link.remote_dev_info.device_id = remote_dev_id;
+        ndev->link.remote_dev_info.link_id = remote_link_id;
+
+        return 0;
+
+fail:
+        nvgpu_info(g, "nvlink endpoint not found or invaling in DT");
+        return -ENODEV;
+}
+#endif /* CONFIG_TEGRA_NVLINK */
+
+void nvgpu_mss_nvlink_init_credits(struct gk20a *g)
+{
+                /* MSS_NVLINK_1_BASE */
+                void __iomem *soc1 = ioremap(0x01f20010, 4096);
+                /* MSS_NVLINK_2_BASE */
+                void __iomem *soc2 = ioremap(0x01f40010, 4096);
+                /* MSS_NVLINK_3_BASE */
+                void __iomem *soc3 = ioremap(0x01f60010, 4096);
+                /* MSS_NVLINK_4_BASE */
+                void __iomem *soc4 = ioremap(0x01f80010, 4096);
+                u32 val;
+
+                nvgpu_log(g, gpu_dbg_info, "init nvlink soc credits");
+
+                val = readl_relaxed(soc1);
+                writel_relaxed(val, soc1);
+                val = readl_relaxed(soc1 + 4);
+                writel_relaxed(val, soc1 + 4);
+
+                val = readl_relaxed(soc2);
+                writel_relaxed(val, soc2);
+                val = readl_relaxed(soc2 + 4);
+                writel_relaxed(val, soc2 + 4);
+
+                val = readl_relaxed(soc3);
+                writel_relaxed(val, soc3);
+                val = readl_relaxed(soc3 + 4);
+                writel_relaxed(val, soc3 + 4);
+
+                val = readl_relaxed(soc4);
+                writel_relaxed(val, soc4);
+                val = readl_relaxed(soc4 + 4);
+                writel_relaxed(val, soc4 + 4);
+}
+
+int nvgpu_nvlink_deinit(struct gk20a *g)
+{
+#ifdef CONFIG_TEGRA_NVLINK
+        struct nvlink_device *ndev = g->nvlink.priv;
+        int err;
+
+        if (!nvgpu_is_enabled(g, NVGPU_SUPPORT_NVLINK))
+                return -ENODEV;
+
+        err = nvlink_shutdown(ndev);
+        if (err) {
+                nvgpu_err(g, "failed to shut down nvlink");
+                return err;
+        }
+
+        nvgpu_nvlink_remove(g);
+
+        return 0;
+#endif
+        return -ENODEV;
+}
diff --git a/include/os/linux/nvlink.h b/include/os/linux/nvlink.h
new file mode 100644
index 0000000..4dc54f6
--- /dev/null
+++ b/include/os/linux/nvlink.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NVGPU_OS_LINUX_NVLINK_H
+
+struct gk20a;
+int nvgpu_nvlink_deinit(struct gk20a *g);
+
+#endif
diff --git a/include/os/linux/os_fence_android.c b/include/os/linux/os_fence_android.c
new file mode 100644
index 0000000..013989e
--- /dev/null
+++ b/include/os/linux/os_fence_android.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <nvgpu/types.h>
+#include <nvgpu/os_fence.h>
+#include <nvgpu/linux/os_fence_android.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/channel.h>
+
+#include "../drivers/staging/android/sync.h"
+
+inline struct sync_fence *nvgpu_get_sync_fence(struct nvgpu_os_fence *s)
+{
+        struct sync_fence *fence = (struct sync_fence *)s->priv;
+        return fence;
+}
+
+static void nvgpu_os_fence_clear(struct nvgpu_os_fence *fence_out)
+{
+        fence_out->priv = NULL;
+        fence_out->g = NULL;
+        fence_out->ops = NULL;
+}
+
+void nvgpu_os_fence_init(struct nvgpu_os_fence *fence_out,
+        struct gk20a *g, const struct nvgpu_os_fence_ops *fops,
+        struct sync_fence *fence)
+{
+        fence_out->g = g;
+        fence_out->ops = fops;
+        fence_out->priv = (void *)fence;
+}
+
+void nvgpu_os_fence_android_drop_ref(struct nvgpu_os_fence *s)
+{
+        struct sync_fence *fence = nvgpu_get_sync_fence(s);
+
+        sync_fence_put(fence);
+
+        nvgpu_os_fence_clear(s);
+}
+
+void nvgpu_os_fence_android_install_fd(struct nvgpu_os_fence *s, int fd)
+{
+        struct sync_fence *fence = nvgpu_get_sync_fence(s);
+
+        sync_fence_get(fence);
+        sync_fence_install(fence, fd);
+}
+
+int nvgpu_os_fence_fdget(struct nvgpu_os_fence *fence_out,
+        struct channel_gk20a *c, int fd)
+{
+        int err = -ENOSYS;
+
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        err = nvgpu_os_fence_syncpt_fdget(fence_out, c, fd);
+#endif
+
+        if (err)
+                err = nvgpu_os_fence_sema_fdget(fence_out, c, fd);
+
+        if (err)
+                nvgpu_err(c->g, "error obtaining fence from fd %d", fd);
+
+        return err;
+}
diff --git a/include/os/linux/os_fence_android_sema.c b/include/os/linux/os_fence_android_sema.c
new file mode 100644
index 0000000..eb60600
--- /dev/null
+++ b/include/os/linux/os_fence_android_sema.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <nvgpu/errno.h>
+
+#include <nvgpu/types.h>
+#include <nvgpu/os_fence.h>
+#include <nvgpu/linux/os_fence_android.h>
+#include <nvgpu/semaphore.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/channel.h>
+#include <nvgpu/channel_sync.h>
+
+#include "gk20a/mm_gk20a.h"
+
+#include "sync_sema_android.h"
+
+#include "../drivers/staging/android/sync.h"
+
+int nvgpu_os_fence_sema_wait_gen_cmd(struct nvgpu_os_fence *s,
+        struct priv_cmd_entry *wait_cmd,
+        struct channel_gk20a *c,
+        int max_wait_cmds)
+{
+        int err;
+        int wait_cmd_size;
+        int num_wait_cmds;
+        int i;
+        struct nvgpu_semaphore *sema;
+        struct sync_fence *sync_fence = nvgpu_get_sync_fence(s);
+
+        wait_cmd_size = c->g->ops.fifo.get_sema_wait_cmd_size();
+
+        num_wait_cmds = sync_fence->num_fences;
+        if (num_wait_cmds == 0)
+                return 0;
+
+        if (max_wait_cmds && num_wait_cmds > max_wait_cmds)
+                return -EINVAL;
+
+        err = gk20a_channel_alloc_priv_cmdbuf(c,
+                wait_cmd_size * num_wait_cmds,
+                wait_cmd);
+        if (err) {
+                return err;
+        }
+
+        for (i = 0; i < num_wait_cmds; i++) {
+                struct sync_pt *pt = sync_pt_from_fence(
+                        sync_fence->cbs[i].sync_pt);
+
+                sema = gk20a_sync_pt_sema(pt);
+                channel_sync_semaphore_gen_wait_cmd(c, sema, wait_cmd,
+                        wait_cmd_size, i);
+        }
+
+        return 0;
+}
+
+static const struct nvgpu_os_fence_ops sema_ops = {
+        .program_waits = nvgpu_os_fence_sema_wait_gen_cmd,
+        .drop_ref = nvgpu_os_fence_android_drop_ref,
+        .install_fence = nvgpu_os_fence_android_install_fd,
+};
+
+int nvgpu_os_fence_sema_create(
+        struct nvgpu_os_fence *fence_out,
+        struct channel_gk20a *c,
+        struct nvgpu_semaphore *sema)
+{
+        struct sync_fence *fence;
+
+        fence = gk20a_sync_fence_create(c, sema, "f-gk20a-0x%04x",
+                        nvgpu_semaphore_gpu_ro_va(sema));
+
+        if (!fence) {
+                nvgpu_err(c->g, "error constructing new fence: f-gk20a-0x%04x",
+                        (u32)nvgpu_semaphore_gpu_ro_va(sema));
+
+                return -ENOMEM;
+        }
+
+        nvgpu_os_fence_init(fence_out, c->g, &sema_ops, fence);
+
+        return 0;
+}
+
+int nvgpu_os_fence_sema_fdget(struct nvgpu_os_fence *fence_out,
+        struct channel_gk20a *c, int fd)
+{
+        struct sync_fence *fence = gk20a_sync_fence_fdget(fd);
+
+        if (!fence)
+                return -EINVAL;
+
+        nvgpu_os_fence_init(fence_out, c->g, &sema_ops, fence);
+
+        return 0;
+}
diff --git a/include/os/linux/os_fence_android_syncpt.c b/include/os/linux/os_fence_android_syncpt.c
new file mode 100644
index 0000000..368a03c
--- /dev/null
+++ b/include/os/linux/os_fence_android_syncpt.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/err.h>
+#include <nvgpu/errno.h>
+
+#include <nvgpu/types.h>
+#include <nvgpu/os_fence.h>
+#include <nvgpu/linux/os_fence_android.h>
+#include <nvgpu/nvhost.h>
+#include <nvgpu/atomic.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/channel.h>
+#include <nvgpu/channel_sync.h>
+
+#include "gk20a/mm_gk20a.h"
+
+#include "../drivers/staging/android/sync.h"
+
+int nvgpu_os_fence_syncpt_wait_gen_cmd(struct nvgpu_os_fence *s,
+        struct priv_cmd_entry *wait_cmd,
+        struct channel_gk20a *c,
+        int max_wait_cmds)
+{
+        int err;
+        int wait_cmd_size;
+        int num_wait_cmds;
+        int i;
+        u32 wait_id;
+        struct sync_pt *pt;
+
+        struct sync_fence *sync_fence = (struct sync_fence *)s->priv;
+
+        if (max_wait_cmds && sync_fence->num_fences > max_wait_cmds)
+                return -EINVAL;
+
+        /* validate syncpt ids */
+        for (i = 0; i < sync_fence->num_fences; i++) {
+                pt = sync_pt_from_fence(sync_fence->cbs[i].sync_pt);
+                wait_id = nvgpu_nvhost_sync_pt_id(pt);
+                if (!wait_id || !nvgpu_nvhost_syncpt_is_valid_pt_ext(
+                                        c->g->nvhost_dev, wait_id)) {
+                        return -EINVAL;
+                }
+        }
+
+        num_wait_cmds = nvgpu_nvhost_sync_num_pts(sync_fence);
+        if (num_wait_cmds == 0)
+                return 0;
+
+        wait_cmd_size = c->g->ops.fifo.get_syncpt_wait_cmd_size();
+        err = gk20a_channel_alloc_priv_cmdbuf(c,
+                wait_cmd_size * num_wait_cmds, wait_cmd);
+        if (err) {
+                return err;
+        }
+
+        for (i = 0; i < sync_fence->num_fences; i++) {
+                struct sync_pt *pt = sync_pt_from_fence(
+                        sync_fence->cbs[i].sync_pt);
+                u32 wait_id = nvgpu_nvhost_sync_pt_id(pt);
+                u32 wait_value = nvgpu_nvhost_sync_pt_thresh(pt);
+
+                err = channel_sync_syncpt_gen_wait_cmd(c, wait_id, wait_value,
+                        wait_cmd, wait_cmd_size, i, true);
+        }
+
+        WARN_ON(i != num_wait_cmds);
+
+        return 0;
+}
+
+static const struct nvgpu_os_fence_ops syncpt_ops = {
+        .program_waits = nvgpu_os_fence_syncpt_wait_gen_cmd,
+        .drop_ref = nvgpu_os_fence_android_drop_ref,
+        .install_fence = nvgpu_os_fence_android_install_fd,
+};
+
+int nvgpu_os_fence_syncpt_create(
+        struct nvgpu_os_fence *fence_out, struct channel_gk20a *c,
+        struct nvgpu_nvhost_dev *nvhost_dev, u32 id, u32 thresh)
+{
+        struct sync_fence *fence = nvgpu_nvhost_sync_create_fence(
+                nvhost_dev, id, thresh, "fence");
+
+        if (IS_ERR(fence)) {
+                nvgpu_err(c->g, "error %d during construction of fence.", (int)PTR_ERR(fence));
+                return PTR_ERR(fence);
+        }
+
+        nvgpu_os_fence_init(fence_out, c->g, &syncpt_ops, fence);
+
+        return 0;
+}
+
+int nvgpu_os_fence_syncpt_fdget(struct nvgpu_os_fence *fence_out,
+        struct channel_gk20a *c, int fd)
+{
+        struct sync_fence *fence = nvgpu_nvhost_sync_fdget(fd);
+
+        if (fence == NULL) {
+                return -ENOMEM;
+        }
+
+        nvgpu_os_fence_init(fence_out, c->g, &syncpt_ops, fence);
+
+        return 0;
+}
diff --git a/include/os/linux/os_linux.h b/include/os/linux/os_linux.h
new file mode 100644
index 0000000..25c6c03
--- /dev/null
+++ b/include/os/linux/os_linux.h
@@ -0,0 +1,187 @@
+/*
+ * Copyright (c) 2017-2020, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NVGPU_OS_LINUX_H
+#define NVGPU_OS_LINUX_H
+
+#include <linux/cdev.h>
+#include <linux/iommu.h>
+#include <linux/hashtable.h>
+
+#include <nvgpu/gk20a.h>
+
+#include "cde.h"
+#include "sched.h"
+
+struct nvgpu_os_linux_ops {
+        struct {
+                void (*get_program_numbers)(struct gk20a *g,
+                                            u32 block_height_log2,
+                                            u32 shader_parameter,
+                                            int *hprog, int *vprog);
+                bool (*need_scatter_buffer)(struct gk20a *g);
+                int (*populate_scatter_buffer)(struct gk20a *g,
+                                               struct sg_table *sgt,
+                                               size_t surface_size,
+                                               void *scatter_buffer_ptr,
+                                               size_t scatter_buffer_size);
+        } cde;
+
+        struct {
+                int (*init_debugfs)(struct gk20a *g);
+        } clk;
+
+        struct {
+                int (*init_debugfs)(struct gk20a *g);
+        } therm;
+
+        struct {
+                int (*init_debugfs)(struct gk20a *g);
+        } fecs_trace;
+};
+
+struct nvgpu_os_linux {
+        struct gk20a g;
+        struct device *dev;
+
+        struct {
+                struct cdev cdev;
+                struct device *node;
+        } channel;
+
+        struct {
+                struct cdev cdev;
+                struct device *node;
+                /* see gk20a_ctrl_priv */
+                struct nvgpu_list_node privs;
+                /* guards modifications to the list and its contents */
+                struct nvgpu_mutex privs_lock;
+        } ctrl;
+
+        struct {
+                struct cdev cdev;
+                struct device *node;
+        } as_dev;
+
+        struct {
+                struct cdev cdev;
+                struct device *node;
+        } dbg;
+
+        struct {
+                struct cdev cdev;
+                struct device *node;
+        } prof;
+
+        struct {
+                struct cdev cdev;
+                struct device *node;
+        } tsg;
+
+        struct {
+                struct cdev cdev;
+                struct device *node;
+        } ctxsw;
+
+        struct {
+                struct cdev cdev;
+                struct device *node;
+        } sched;
+
+        dev_t cdev_region;
+
+        struct devfreq *devfreq;
+
+        struct device_dma_parameters dma_parms;
+
+        atomic_t hw_irq_stall_count;
+        atomic_t hw_irq_nonstall_count;
+
+        struct nvgpu_cond sw_irq_stall_last_handled_wq;
+        atomic_t sw_irq_stall_last_handled;
+
+        atomic_t nonstall_ops;
+
+        struct nvgpu_cond sw_irq_nonstall_last_handled_wq;
+        atomic_t sw_irq_nonstall_last_handled;
+
+        struct work_struct nonstall_fn_work;
+        struct workqueue_struct *nonstall_work_queue;
+
+        struct resource *reg_mem;
+        void __iomem *regs;
+        void __iomem *regs_saved;
+
+        struct resource *bar1_mem;
+        void __iomem *bar1;
+        void __iomem *bar1_saved;
+
+        void __iomem *usermode_regs;
+        void __iomem *usermode_regs_saved;
+
+        u64 regs_bus_addr;
+
+        struct nvgpu_os_linux_ops ops;
+
+#ifdef CONFIG_DEBUG_FS
+        struct dentry *debugfs;
+        struct dentry *debugfs_alias;
+
+        struct dentry *debugfs_ltc_enabled;
+        struct dentry *debugfs_timeouts_enabled;
+        struct dentry *debugfs_gr_idle_timeout_default;
+        struct dentry *debugfs_disable_bigpage;
+        struct dentry *debugfs_gr_default_attrib_cb_size;
+
+        struct dentry *debugfs_timeslice_low_priority_us;
+        struct dentry *debugfs_timeslice_medium_priority_us;
+        struct dentry *debugfs_timeslice_high_priority_us;
+        struct dentry *debugfs_runlist_interleave;
+        struct dentry *debugfs_allocators;
+        struct dentry *debugfs_xve;
+        struct dentry *debugfs_kmem;
+        struct dentry *debugfs_hal;
+        struct dentry *debugfs_ltc;
+
+        struct dentry *debugfs_force_preemption_cilp;
+        struct dentry *debugfs_force_preemption_gfxp;
+        struct dentry *debugfs_dump_ctxsw_stats;
+#endif
+        DECLARE_HASHTABLE(ecc_sysfs_stats_htable, 5);
+        struct dev_ext_attribute *ecc_attrs;
+
+        struct gk20a_cde_app cde_app;
+
+        struct rw_semaphore busy_lock;
+
+        bool init_done;
+};
+
+static inline struct nvgpu_os_linux *nvgpu_os_linux_from_gk20a(struct gk20a *g)
+{
+        return container_of(g, struct nvgpu_os_linux, g);
+}
+
+static inline struct device *dev_from_gk20a(struct gk20a *g)
+{
+        return nvgpu_os_linux_from_gk20a(g)->dev;
+}
+
+#define INTERFACE_NAME "nvhost%s-gpu"
+
+#define totalram_size_in_mb (totalram_pages >> (10 - (PAGE_SHIFT - 10)))
+
+#endif
diff --git a/include/os/linux/os_ops.c b/include/os/linux/os_ops.c
new file mode 100644
index 0000000..f1ab4b1
--- /dev/null
+++ b/include/os/linux/os_ops.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "os_linux.h"
+
+#include "os_ops_gm20b.h"
+#include "os_ops_gp10b.h"
+#include "os_ops_gp106.h"
+#include "os_ops_gv11b.h"
+#include "os_ops_gv100.h"
+
+#if defined(CONFIG_TEGRA_GPU_NEXT)
+#include "nvgpu_gpuid_next.h"
+#endif
+
+int nvgpu_init_os_linux_ops(struct nvgpu_os_linux *l)
+{
+        struct gk20a *g = &l->g;
+        u32 ver = g->params.gpu_arch + g->params.gpu_impl;
+
+        switch (ver) {
+        case GK20A_GPUID_GM20B:
+        case GK20A_GPUID_GM20B_B:
+                nvgpu_gm20b_init_os_ops(l);
+                break;
+        case NVGPU_GPUID_GP10B:
+                nvgpu_gp10b_init_os_ops(l);
+                break;
+        case NVGPU_GPUID_GP106:
+                nvgpu_gp106_init_os_ops(l);
+                break;
+        case NVGPU_GPUID_GV100:
+                nvgpu_gv100_init_os_ops(l);
+                break;
+        case NVGPU_GPUID_GV11B:
+                nvgpu_gv11b_init_os_ops(l);
+                break;
+#if defined(CONFIG_TEGRA_GPU_NEXT)
+        case NVGPU_GPUID_NEXT:
+                NVGPU_NEXT_INIT_OS_OPS(l);
+                break;
+#endif
+        default:
+                break;
+        }
+
+        return 0;
+}
diff --git a/include/os/linux/os_ops.h b/include/os/linux/os_ops.h
new file mode 100644
index 0000000..af3ce0a
--- /dev/null
+++ b/include/os/linux/os_ops.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __LINUX_OS_OPS_H
+#define __LINUX_OS_OPS_H
+
+int nvgpu_init_os_linux_ops(struct nvgpu_os_linux *l);
+
+#endif
diff --git a/include/os/linux/os_ops_gm20b.c b/include/os/linux/os_ops_gm20b.c
new file mode 100644
index 0000000..77aee39
--- /dev/null
+++ b/include/os/linux/os_ops_gm20b.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "os_linux.h"
+
+#include "cde_gm20b.h"
+#include "debug_clk_gm20b.h"
+#include "debug_fecs_trace.h"
+
+
+static struct nvgpu_os_linux_ops gm20b_os_linux_ops = {
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        .cde = {
+                .get_program_numbers = gm20b_cde_get_program_numbers,
+        },
+#endif
+        .clk = {
+                .init_debugfs = gm20b_clk_init_debugfs,
+        },
+
+        .fecs_trace = {
+                .init_debugfs = nvgpu_fecs_trace_init_debugfs,
+        },
+};
+
+void nvgpu_gm20b_init_os_ops(struct nvgpu_os_linux *l)
+{
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        l->ops.cde = gm20b_os_linux_ops.cde;
+#endif
+        l->ops.clk = gm20b_os_linux_ops.clk;
+
+        l->ops.fecs_trace = gm20b_os_linux_ops.fecs_trace;
+}
diff --git a/include/os/linux/os_ops_gm20b.h b/include/os/linux/os_ops_gm20b.h
new file mode 100644
index 0000000..7d27e40
--- /dev/null
+++ b/include/os/linux/os_ops_gm20b.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __LINUX_OS_OPS_GM20B_H
+#define __LINUX_OS_OPS_GM20B_H
+
+void nvgpu_gm20b_init_os_ops(struct nvgpu_os_linux *l);
+
+#endif
diff --git a/include/os/linux/os_ops_gp106.c b/include/os/linux/os_ops_gp106.c
new file mode 100644
index 0000000..14f1b00
--- /dev/null
+++ b/include/os/linux/os_ops_gp106.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "os_linux.h"
+
+#include "debug_clk_gp106.h"
+#include "debug_therm_gp106.h"
+#include "debug_fecs_trace.h"
+
+static struct nvgpu_os_linux_ops gp106_os_linux_ops = {
+        .clk = {
+                .init_debugfs = gp106_clk_init_debugfs,
+        },
+        .therm = {
+                .init_debugfs = gp106_therm_init_debugfs,
+        },
+        .fecs_trace = {
+                .init_debugfs = nvgpu_fecs_trace_init_debugfs,
+        },
+};
+
+void nvgpu_gp106_init_os_ops(struct nvgpu_os_linux *l)
+{
+        l->ops.clk = gp106_os_linux_ops.clk;
+        l->ops.therm = gp106_os_linux_ops.therm;
+        l->ops.fecs_trace = gp106_os_linux_ops.fecs_trace;
+}
diff --git a/include/os/linux/os_ops_gp106.h b/include/os/linux/os_ops_gp106.h
new file mode 100644
index 0000000..7d423d5
--- /dev/null
+++ b/include/os/linux/os_ops_gp106.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __LINUX_OS_OPS_GP106_H
+#define __LINUX_OS_OPS_GP106_H
+
+void nvgpu_gp106_init_os_ops(struct nvgpu_os_linux *l);
+
+#endif
diff --git a/include/os/linux/os_ops_gp10b.c b/include/os/linux/os_ops_gp10b.c
new file mode 100644
index 0000000..e2891f7
--- /dev/null
+++ b/include/os/linux/os_ops_gp10b.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "os_linux.h"
+
+#include "cde_gp10b.h"
+#include "debug_fecs_trace.h"
+
+static struct nvgpu_os_linux_ops gp10b_os_linux_ops = {
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        .cde = {
+                .get_program_numbers = gp10b_cde_get_program_numbers,
+                .need_scatter_buffer = gp10b_need_scatter_buffer,
+                .populate_scatter_buffer = gp10b_populate_scatter_buffer,
+        },
+#endif
+        .fecs_trace = {
+                .init_debugfs = nvgpu_fecs_trace_init_debugfs,
+        },
+};
+
+void nvgpu_gp10b_init_os_ops(struct nvgpu_os_linux *l)
+{
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        l->ops.cde = gp10b_os_linux_ops.cde;
+#endif
+        l->ops.fecs_trace = gp10b_os_linux_ops.fecs_trace;
+}
diff --git a/include/os/linux/os_ops_gp10b.h b/include/os/linux/os_ops_gp10b.h
new file mode 100644
index 0000000..0be1bca
--- /dev/null
+++ b/include/os/linux/os_ops_gp10b.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __LINUX_OS_OPS_GP10B_H
+#define __LINUX_OS_OPS_GP10B_H
+
+void nvgpu_gp10b_init_os_ops(struct nvgpu_os_linux *l);
+
+#endif
diff --git a/include/os/linux/os_ops_gv100.c b/include/os/linux/os_ops_gv100.c
new file mode 100644
index 0000000..9d92bdf
--- /dev/null
+++ b/include/os/linux/os_ops_gv100.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "os_linux.h"
+
+#include "debug_clk_gv100.h"
+#include "debug_therm_gp106.h"
+#include "debug_fecs_trace.h"
+
+static struct nvgpu_os_linux_ops gv100_os_linux_ops = {
+        .clk = {
+                .init_debugfs = gv100_clk_init_debugfs,
+        },
+        .therm = {
+                .init_debugfs = gp106_therm_init_debugfs,
+        },
+        .fecs_trace = {
+                .init_debugfs = nvgpu_fecs_trace_init_debugfs,
+        },
+};
+
+void nvgpu_gv100_init_os_ops(struct nvgpu_os_linux *l)
+{
+        l->ops.clk = gv100_os_linux_ops.clk;
+        l->ops.therm = gv100_os_linux_ops.therm;
+        l->ops.fecs_trace = gv100_os_linux_ops.fecs_trace;
+}
diff --git a/include/os/linux/os_ops_gv100.h b/include/os/linux/os_ops_gv100.h
new file mode 100644
index 0000000..43923b2
--- /dev/null
+++ b/include/os/linux/os_ops_gv100.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __LINUX_OS_OPS_GV100_H
+#define __LINUX_OS_OPS_GV100_H
+
+void nvgpu_gv100_init_os_ops(struct nvgpu_os_linux *l);
+
+#endif
diff --git a/include/os/linux/os_ops_gv11b.c b/include/os/linux/os_ops_gv11b.c
new file mode 100644
index 0000000..a82ad0a
--- /dev/null
+++ b/include/os/linux/os_ops_gv11b.c
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "os_linux.h"
+
+#include "debug_fecs_trace.h"
+
+static struct nvgpu_os_linux_ops gv11b_os_linux_ops = {
+        .fecs_trace = {
+                .init_debugfs = nvgpu_fecs_trace_init_debugfs,
+        },
+};
+
+void nvgpu_gv11b_init_os_ops(struct nvgpu_os_linux *l)
+{
+        l->ops.fecs_trace = gv11b_os_linux_ops.fecs_trace;
+}
diff --git a/include/os/linux/os_ops_gv11b.h b/include/os/linux/os_ops_gv11b.h
new file mode 100644
index 0000000..eef6c4a
--- /dev/null
+++ b/include/os/linux/os_ops_gv11b.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LINUX_OS_OPS_GV11B_H
+#define LINUX_OS_OPS_GV11B_H
+
+struct nvgpu_os_linux;
+
+void nvgpu_gv11b_init_os_ops(struct nvgpu_os_linux *l);
+
+#endif
diff --git a/include/os/linux/os_sched.c b/include/os/linux/os_sched.c
new file mode 100644
index 0000000..9a25da1
--- /dev/null
+++ b/include/os/linux/os_sched.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <nvgpu/os_sched.h>
+
+#include <linux/sched.h>
+
+int nvgpu_current_tid(struct gk20a *g)
+{
+        return current->pid;
+}
+
+int nvgpu_current_pid(struct gk20a *g)
+{
+        return current->tgid;
+}
+
+void __nvgpu_print_current(struct gk20a *g, const char *func_name, int line,
+                void *ctx, enum nvgpu_log_type type)
+{
+        __nvgpu_log_msg(g, func_name, line, type, current->comm);
+}
diff --git a/include/os/linux/pci.c b/include/os/linux/pci.c
new file mode 100644
index 0000000..07071d1
--- /dev/null
+++ b/include/os/linux/pci.c
@@ -0,0 +1,854 @@
+/*
+ * Copyright (c) 2016-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/pm_runtime.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+
+#include <nvgpu/nvhost.h>
+#include <nvgpu/nvgpu_common.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/enabled.h>
+#include <nvgpu/nvlink.h>
+#include <nvgpu/soc.h>
+#include <nvgpu/sim.h>
+#include <nvgpu/gk20a.h>
+
+#include "nvlink.h"
+#include "clk/clk.h"
+#include "clk/clk_mclk.h"
+#include "module.h"
+#include "intr.h"
+#include "sysfs.h"
+#include "os_linux.h"
+#include "platform_gk20a.h"
+
+#include "pci.h"
+#include "pci_usermode.h"
+
+#include "driver_common.h"
+
+#define PCI_INTERFACE_NAME "card-%s%%s"
+
+static int nvgpu_pci_tegra_probe(struct device *dev)
+{
+        return 0;
+}
+
+static int nvgpu_pci_tegra_remove(struct device *dev)
+{
+        return 0;
+}
+
+static bool nvgpu_pci_tegra_is_railgated(struct device *pdev)
+{
+        return false;
+}
+
+static long nvgpu_pci_clk_round_rate(struct device *dev, unsigned long rate)
+{
+        long ret = (long)rate;
+
+        if (rate == UINT_MAX)
+                ret = BOOT_GPC2CLK_MHZ * 1000000UL;
+
+        return ret;
+}
+
+static struct gk20a_platform nvgpu_pci_device[] = {
+        { /* DEVICE=0x1c35 */
+        /* ptimer src frequency in hz */
+        .ptimer_src_freq        = 31250000,
+
+        .probe = nvgpu_pci_tegra_probe,
+        .remove = nvgpu_pci_tegra_remove,
+
+        /* power management configuration */
+        .railgate_delay_init    = 500,
+        .can_railgate_init      = false,
+        .can_elpg_init = true,
+        .enable_elpg = true,
+        .enable_elcg = false,
+        .enable_slcg = true,
+        .enable_blcg = true,
+        .enable_mscg = true,
+        .can_slcg    = true,
+        .can_blcg    = true,
+        .can_elcg    = true,
+
+        .disable_aspm = true,
+
+        /* power management callbacks */
+        .is_railgated = nvgpu_pci_tegra_is_railgated,
+        .clk_round_rate = nvgpu_pci_clk_round_rate,
+
+        .ch_wdt_timeout_ms = 7000,
+
+        .honors_aperture = true,
+        .dma_mask = DMA_BIT_MASK(40),
+        .vbios_min_version = 0x86063000,
+        .hardcode_sw_threshold = true,
+        .ina3221_dcb_index = 0,
+        .ina3221_i2c_address = 0x84,
+        .ina3221_i2c_port = 0x2,
+        },
+        { /* DEVICE=0x1c36 */
+        /* ptimer src frequency in hz */
+        .ptimer_src_freq        = 31250000,
+
+        .probe = nvgpu_pci_tegra_probe,
+        .remove = nvgpu_pci_tegra_remove,
+
+        /* power management configuration */
+        .railgate_delay_init    = 500,
+        .can_railgate_init      = false,
+        .can_elpg_init = true,
+        .enable_elpg = true,
+        .enable_elcg = false,
+        .enable_slcg = true,
+        .enable_blcg = true,
+        .enable_mscg = true,
+        .can_slcg    = true,
+        .can_blcg    = true,
+        .can_elcg    = true,
+
+        .disable_aspm = true,
+
+        /* power management callbacks */
+        .is_railgated = nvgpu_pci_tegra_is_railgated,
+        .clk_round_rate = nvgpu_pci_clk_round_rate,
+
+        .ch_wdt_timeout_ms = 7000,
+
+        .honors_aperture = true,
+        .dma_mask = DMA_BIT_MASK(40),
+        .vbios_min_version = 0x86062d00,
+        .hardcode_sw_threshold = true,
+        .ina3221_dcb_index = 0,
+        .ina3221_i2c_address = 0x84,
+        .ina3221_i2c_port = 0x2,
+        },
+        { /* DEVICE=0x1c37 */
+        /* ptimer src frequency in hz */
+        .ptimer_src_freq        = 31250000,
+
+        .probe = nvgpu_pci_tegra_probe,
+        .remove = nvgpu_pci_tegra_remove,
+
+        /* power management configuration */
+        .railgate_delay_init    = 500,
+        .can_railgate_init      = false,
+        .can_elpg_init = true,
+        .enable_elpg = true,
+        .enable_elcg = false,
+        .enable_slcg = true,
+        .enable_blcg = true,
+        .enable_mscg = true,
+        .can_slcg    = true,
+        .can_blcg    = true,
+        .can_elcg    = true,
+
+        .disable_aspm = true,
+
+        /* power management callbacks */
+        .is_railgated = nvgpu_pci_tegra_is_railgated,
+        .clk_round_rate = nvgpu_pci_clk_round_rate,
+
+        .ch_wdt_timeout_ms = 7000,
+
+        .honors_aperture = true,
+        .dma_mask = DMA_BIT_MASK(40),
+        .vbios_min_version = 0x86063000,
+        .hardcode_sw_threshold = true,
+        .ina3221_dcb_index = 0,
+        .ina3221_i2c_address = 0x84,
+        .ina3221_i2c_port = 0x2,
+        },
+        { /* DEVICE=0x1c75 */
+        /* ptimer src frequency in hz */
+        .ptimer_src_freq        = 31250000,
+
+        .probe = nvgpu_pci_tegra_probe,
+        .remove = nvgpu_pci_tegra_remove,
+
+        /* power management configuration */
+        .railgate_delay_init    = 500,
+        .can_railgate_init      = false,
+        .can_elpg_init = true,
+        .enable_elpg = true,
+        .enable_elcg = false,
+        .enable_slcg = true,
+        .enable_blcg = true,
+        .enable_mscg = true,
+        .can_slcg    = true,
+        .can_blcg    = true,
+        .can_elcg    = true,
+
+        .disable_aspm = true,
+
+        /* power management callbacks */
+        .is_railgated = nvgpu_pci_tegra_is_railgated,
+        .clk_round_rate = nvgpu_pci_clk_round_rate,
+
+        .ch_wdt_timeout_ms = 7000,
+
+        .honors_aperture = true,
+        .dma_mask = DMA_BIT_MASK(40),
+        .vbios_min_version = 0x86065300,
+        .hardcode_sw_threshold = false,
+        .ina3221_dcb_index = 1,
+        .ina3221_i2c_address = 0x80,
+        .ina3221_i2c_port = 0x1,
+        },
+        { /* DEVICE=PG503 SKU 201 */
+        /* ptimer src frequency in hz */
+        .ptimer_src_freq        = 31250000,
+
+        .probe = nvgpu_pci_tegra_probe,
+        .remove = nvgpu_pci_tegra_remove,
+
+        /* power management configuration */
+        .railgate_delay_init    = 500,
+        .can_railgate_init      = false,
+        .can_elpg_init = false,
+        .enable_elpg = false,
+        .enable_elcg = false,
+        .enable_slcg = false,
+        .enable_blcg = false,
+        .enable_mscg = false,
+        .can_slcg    = false,
+        .can_blcg    = false,
+        .can_elcg    = false,
+
+        .disable_aspm = true,
+
+        /* power management callbacks */
+        .is_railgated = nvgpu_pci_tegra_is_railgated,
+        .clk_round_rate = nvgpu_pci_clk_round_rate,
+
+        .ch_wdt_timeout_ms = 7000,
+
+        .honors_aperture = true,
+        .dma_mask = DMA_BIT_MASK(40),
+        .vbios_min_version = 0x88001e00,
+        .hardcode_sw_threshold = false,
+        .run_preos = true,
+        },
+        { /* DEVICE=PG503 SKU 200 ES */
+        /* ptimer src frequency in hz */
+        .ptimer_src_freq        = 31250000,
+
+        .probe = nvgpu_pci_tegra_probe,
+        .remove = nvgpu_pci_tegra_remove,
+
+        /* power management configuration */
+        .railgate_delay_init    = 500,
+        .can_railgate_init      = false,
+        .can_elpg_init = false,
+        .enable_elpg = false,
+        .enable_elcg = false,
+        .enable_slcg = false,
+        .enable_blcg = false,
+        .enable_mscg = false,
+        .can_slcg    = false,
+        .can_blcg    = false,
+        .can_elcg    = false,
+
+        .disable_aspm = true,
+
+        /* power management callbacks */
+        .is_railgated = nvgpu_pci_tegra_is_railgated,
+        .clk_round_rate = nvgpu_pci_clk_round_rate,
+
+        .ch_wdt_timeout_ms = 7000,
+
+        .honors_aperture = true,
+        .dma_mask = DMA_BIT_MASK(40),
+        .vbios_min_version = 0x88001e00,
+        .hardcode_sw_threshold = false,
+        .run_preos = true,
+        },
+        {
+        /* ptimer src frequency in hz */
+        .ptimer_src_freq        = 31250000,
+
+        .probe = nvgpu_pci_tegra_probe,
+        .remove = nvgpu_pci_tegra_remove,
+
+        /* power management configuration */
+        .railgate_delay_init    = 500,
+        .can_railgate_init      = false,
+        .can_elpg_init = false,
+        .enable_elpg = false,
+        .enable_elcg = false,
+        .enable_slcg = false,
+        .enable_blcg = false,
+        .enable_mscg = false,
+        .can_slcg    = false,
+        .can_blcg    = false,
+        .can_elcg    = false,
+
+        .disable_aspm = true,
+
+        /* power management callbacks */
+        .is_railgated = nvgpu_pci_tegra_is_railgated,
+        .clk_round_rate = nvgpu_pci_clk_round_rate,
+
+        .ch_wdt_timeout_ms = 7000,
+
+        .honors_aperture = true,
+        .dma_mask = DMA_BIT_MASK(40),
+        .vbios_min_version = 0x88000126,
+        .hardcode_sw_threshold = false,
+        .run_preos = true,
+        .has_syncpoints = true,
+        },
+        { /* SKU250 */
+        /* ptimer src frequency in hz */
+        .ptimer_src_freq        = 31250000,
+
+        .probe = nvgpu_pci_tegra_probe,
+        .remove = nvgpu_pci_tegra_remove,
+
+        /* power management configuration */
+        .railgate_delay_init    = 500,
+        .can_railgate_init      = false,
+        .can_elpg_init = false,
+        .enable_elpg = false,
+        .enable_elcg = false,
+        .enable_slcg = true,
+        .enable_blcg = true,
+        .enable_mscg = false,
+        .can_slcg    = true,
+        .can_blcg    = true,
+        .can_elcg    = false,
+
+        .disable_aspm = true,
+
+        /* power management callbacks */
+        .is_railgated = nvgpu_pci_tegra_is_railgated,
+        .clk_round_rate = nvgpu_pci_clk_round_rate,
+
+        .ch_wdt_timeout_ms = 7000,
+
+        .honors_aperture = true,
+        .dma_mask = DMA_BIT_MASK(40),
+        .vbios_min_version = 0x1,
+        .hardcode_sw_threshold = false,
+        .run_preos = true,
+        .has_syncpoints = true,
+        },
+        { /* SKU 0x1e3f */
+        /* ptimer src frequency in hz */
+        .ptimer_src_freq        = 31250000,
+
+        .probe = nvgpu_pci_tegra_probe,
+        .remove = nvgpu_pci_tegra_remove,
+
+        /* power management configuration */
+        .railgate_delay_init    = 500,
+        .can_railgate_init      = false,
+        .can_elpg_init = false,
+        .enable_elpg = false,
+        .enable_elcg = false,
+        .enable_slcg = false,
+        .enable_blcg = false,
+        .enable_mscg = false,
+        .can_slcg    = false,
+        .can_blcg    = false,
+        .can_elcg    = false,
+
+        .disable_aspm = true,
+
+        /* power management callbacks */
+        .is_railgated = nvgpu_pci_tegra_is_railgated,
+        .clk_round_rate = nvgpu_pci_clk_round_rate,
+
+        /*
+         * WAR: PCIE X1 is very slow, set to very high value till nvlink is up
+         */
+        .ch_wdt_timeout_ms = 30000,
+
+        .honors_aperture = true,
+        .dma_mask = DMA_BIT_MASK(40),
+        .vbios_min_version = 0x1,
+        .hardcode_sw_threshold = false,
+        .unified_memory = false,
+        },
+
+};
+
+static struct pci_device_id nvgpu_pci_table[] = {
+        {
+                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x1c35),
+                .class = PCI_BASE_CLASS_DISPLAY << 16,
+                .class_mask = 0xff << 16,
+                .driver_data = 0,
+        },
+        {
+                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x1c36),
+                .class = PCI_BASE_CLASS_DISPLAY << 16,
+                .class_mask = 0xff << 16,
+                .driver_data = 1,
+        },
+        {
+                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x1c37),
+                .class = PCI_BASE_CLASS_DISPLAY << 16,
+                .class_mask = 0xff << 16,
+                .driver_data = 2,
+        },
+        {
+                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x1c75),
+                .class = PCI_BASE_CLASS_DISPLAY << 16,
+                .class_mask = 0xff << 16,
+                .driver_data = 3,
+        },
+        {
+                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x1db1),
+                .class = PCI_BASE_CLASS_DISPLAY << 16,
+                .class_mask = 0xff << 16,
+                .driver_data = 4,
+        },
+        {
+                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x1db0),
+                .class = PCI_BASE_CLASS_DISPLAY << 16,
+                .class_mask = 0xff << 16,
+                .driver_data = 5,
+        },
+        {
+                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x1dbe),
+                .class = PCI_BASE_CLASS_DISPLAY << 16,
+                .class_mask = 0xff << 16,
+                .driver_data = 6,
+        },
+        {
+                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x1df1),
+                .class = PCI_BASE_CLASS_DISPLAY << 16,
+                .class_mask = 0xff << 16,
+                .driver_data = 7,
+        },
+        {
+                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x1e3f),
+                .class = PCI_BASE_CLASS_DISPLAY << 16,
+                .class_mask = 0xff << 16,
+                .driver_data = 8,
+        },
+        {}
+};
+
+static irqreturn_t nvgpu_pci_isr(int irq, void *dev_id)
+{
+        struct gk20a *g = dev_id;
+        irqreturn_t ret_stall;
+        irqreturn_t ret_nonstall;
+
+        ret_stall = nvgpu_intr_stall(g);
+        ret_nonstall = nvgpu_intr_nonstall(g);
+
+#if defined(CONFIG_PCI_MSI)
+        /* Send MSI EOI */
+        if (g->ops.xve.rearm_msi && g->msi_enabled)
+                g->ops.xve.rearm_msi(g);
+#endif
+
+        return (ret_stall == IRQ_NONE) ? ret_nonstall : IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t nvgpu_pci_intr_thread(int irq, void *dev_id)
+{
+        struct gk20a *g = dev_id;
+
+        return nvgpu_intr_thread_stall(g);
+}
+
+static int nvgpu_pci_init_support(struct pci_dev *pdev)
+{
+        int err = 0;
+        struct gk20a *g = get_gk20a(&pdev->dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct device *dev = &pdev->dev;
+
+        l->regs = nvgpu_devm_ioremap(dev, pci_resource_start(pdev, 0),
+                                     pci_resource_len(pdev, 0));
+        if (IS_ERR(l->regs)) {
+                nvgpu_err(g, "failed to remap gk20a registers");
+                err = PTR_ERR(l->regs);
+                goto fail;
+        }
+
+        l->regs_bus_addr = pci_resource_start(pdev, 0);
+        if (!l->regs_bus_addr) {
+                nvgpu_err(g, "failed to read register bus offset");
+                err = -ENODEV;
+                goto fail;
+        }
+
+        l->bar1 = nvgpu_devm_ioremap(dev, pci_resource_start(pdev, 1),
+                                     pci_resource_len(pdev, 1));
+        if (IS_ERR(l->bar1)) {
+                nvgpu_err(g, "failed to remap gk20a bar1");
+                err = PTR_ERR(l->bar1);
+                goto fail;
+        }
+
+        err = nvgpu_init_sim_support_linux_pci(g);
+        if (err)
+                goto fail;
+        err = nvgpu_init_sim_support_pci(g);
+        if (err)
+                goto fail_sim;
+
+        nvgpu_pci_init_usermode_support(l);
+
+        return 0;
+
+ fail_sim:
+        nvgpu_remove_sim_support_linux_pci(g);
+ fail:
+        if (l->regs)
+                l->regs = NULL;
+
+        if (l->bar1)
+                l->bar1 = NULL;
+
+        return err;
+}
+
+static char *nvgpu_pci_devnode(struct device *dev, umode_t *mode)
+{
+        if (mode)
+                *mode = S_IRUGO | S_IWUGO;
+        return kasprintf(GFP_KERNEL, "nvgpu-pci/%s", dev_name(dev));
+}
+
+static struct class nvgpu_pci_class = {
+        .owner = THIS_MODULE,
+        .name = "nvidia-pci-gpu",
+        .devnode = nvgpu_pci_devnode,
+};
+
+#ifdef CONFIG_PM
+static int nvgpu_pci_pm_runtime_resume(struct device *dev)
+{
+        return gk20a_pm_finalize_poweron(dev);
+}
+
+static int nvgpu_pci_pm_runtime_suspend(struct device *dev)
+{
+        return 0;
+}
+
+static int nvgpu_pci_pm_resume(struct device *dev)
+{
+        return gk20a_pm_finalize_poweron(dev);
+}
+
+static int nvgpu_pci_pm_suspend(struct device *dev)
+{
+        return 0;
+}
+
+static const struct dev_pm_ops nvgpu_pci_pm_ops = {
+        .runtime_resume = nvgpu_pci_pm_runtime_resume,
+        .runtime_suspend = nvgpu_pci_pm_runtime_suspend,
+        .resume = nvgpu_pci_pm_resume,
+        .suspend = nvgpu_pci_pm_suspend,
+};
+#endif
+
+static int nvgpu_pci_pm_init(struct device *dev)
+{
+#ifdef CONFIG_PM
+        struct gk20a *g = get_gk20a(dev);
+
+        if (!nvgpu_is_enabled(g, NVGPU_CAN_RAILGATE)) {
+                pm_runtime_disable(dev);
+        } else {
+                if (g->railgate_delay)
+                        pm_runtime_set_autosuspend_delay(dev,
+                                g->railgate_delay);
+
+                /*
+                 * set gpu dev's use_autosuspend flag to allow
+                 * runtime power management of GPU
+                 */
+                pm_runtime_use_autosuspend(dev);
+
+                /*
+                 * runtime PM for PCI devices is forbidden
+                 * by default, so unblock RTPM of GPU
+                 */
+                pm_runtime_put_noidle(dev);
+                pm_runtime_allow(dev);
+        }
+#endif
+        return 0;
+}
+
+static int nvgpu_pci_pm_deinit(struct device *dev)
+{
+#ifdef CONFIG_PM
+        struct gk20a *g = get_gk20a(dev);
+
+        if (!nvgpu_is_enabled(g, NVGPU_CAN_RAILGATE))
+                pm_runtime_enable(dev);
+        else
+                pm_runtime_forbid(dev);
+#endif
+        return 0;
+}
+
+static int nvgpu_pci_probe(struct pci_dev *pdev,
+                           const struct pci_device_id *pent)
+{
+        struct gk20a_platform *platform = NULL;
+        struct nvgpu_os_linux *l;
+        struct gk20a *g;
+        int err;
+        char nodefmt[64];
+        struct device_node *np;
+
+        /* make sure driver_data is a sane index */
+        if (pent->driver_data >= sizeof(nvgpu_pci_device) /
+                                 sizeof(nvgpu_pci_device[0])) {
+                return -EINVAL;
+        }
+
+        l = kzalloc(sizeof(*l), GFP_KERNEL);
+        if (!l) {
+                dev_err(&pdev->dev, "couldn't allocate gk20a support");
+                return -ENOMEM;
+        }
+
+        hash_init(l->ecc_sysfs_stats_htable);
+
+        g = &l->g;
+
+        g->log_mask = NVGPU_DEFAULT_DBG_MASK;
+
+        nvgpu_init_gk20a(g);
+
+        nvgpu_kmem_init(g);
+
+        /* Allocate memory to hold platform data*/
+        platform = (struct gk20a_platform *)nvgpu_kzalloc( g,
+                        sizeof(struct gk20a_platform));
+        if (!platform) {
+                dev_err(&pdev->dev, "couldn't allocate platform data");
+                err = -ENOMEM;
+                goto err_free_l;
+        }
+
+        /* copy detected device data to allocated platform space*/
+        memcpy((void *)platform, (void *)&nvgpu_pci_device[pent->driver_data],
+                sizeof(struct gk20a_platform));
+
+        pci_set_drvdata(pdev, platform);
+
+        err = nvgpu_init_enabled_flags(g);
+        if (err)
+                goto err_free_platform;
+
+        platform->g = g;
+        l->dev = &pdev->dev;
+
+        np = nvgpu_get_node(g);
+        if (of_dma_is_coherent(np)) {
+                __nvgpu_set_enabled(g, NVGPU_USE_COHERENT_SYSMEM, true);
+                __nvgpu_set_enabled(g, NVGPU_SUPPORT_IO_COHERENCE, true);
+        }
+
+        err = pci_enable_device(pdev);
+        if (err)
+                goto err_free_platform;
+        pci_set_master(pdev);
+
+        g->pci_vendor_id = pdev->vendor;
+        g->pci_device_id = pdev->device;
+        g->pci_subsystem_vendor_id = pdev->subsystem_vendor;
+        g->pci_subsystem_device_id = pdev->subsystem_device;
+        g->pci_class = (pdev->class >> 8) & 0xFFFFU; // we only want base/sub
+        g->pci_revision = pdev->revision;
+
+        g->ina3221_dcb_index = platform->ina3221_dcb_index;
+        g->ina3221_i2c_address = platform->ina3221_i2c_address;
+        g->ina3221_i2c_port = platform->ina3221_i2c_port;
+        g->hardcode_sw_threshold = platform->hardcode_sw_threshold;
+
+#if defined(CONFIG_PCI_MSI)
+        err = pci_enable_msi(pdev);
+        if (err) {
+                nvgpu_err(g,
+                        "MSI could not be enabled, falling back to legacy");
+                g->msi_enabled = false;
+        } else
+                g->msi_enabled = true;
+#endif
+
+        g->irq_stall = pdev->irq;
+        g->irq_nonstall = pdev->irq;
+        if (g->irq_stall < 0) {
+                err = -ENXIO;
+                goto err_disable_msi;
+        }
+
+        err = devm_request_threaded_irq(&pdev->dev,
+                        g->irq_stall,
+                        nvgpu_pci_isr,
+                        nvgpu_pci_intr_thread,
+#if defined(CONFIG_PCI_MSI)
+                        g->msi_enabled ? 0 :
+#endif
+                        IRQF_SHARED, "nvgpu", g);
+        if (err) {
+                nvgpu_err(g,
+                        "failed to request irq @ %d", g->irq_stall);
+                goto err_disable_msi;
+        }
+        disable_irq(g->irq_stall);
+
+        err = nvgpu_pci_init_support(pdev);
+        if (err)
+                goto err_free_irq;
+
+        if (strchr(dev_name(&pdev->dev), '%')) {
+                nvgpu_err(g, "illegal character in device name");
+                err = -EINVAL;
+                goto err_free_irq;
+        }
+
+        snprintf(nodefmt, sizeof(nodefmt),
+                 PCI_INTERFACE_NAME, dev_name(&pdev->dev));
+
+        err = nvgpu_probe(g, "gpu_pci", nodefmt, &nvgpu_pci_class);
+        if (err)
+                goto err_free_irq;
+
+        err = nvgpu_pci_pm_init(&pdev->dev);
+        if (err) {
+                nvgpu_err(g, "pm init failed");
+                goto err_free_irq;
+        }
+
+        err = nvgpu_nvlink_probe(g);
+        /*
+         * ENODEV is a legal error which means there is no NVLINK
+         * any other error is fatal
+         */
+        if (err) {
+                if (err != -ENODEV) {
+                        nvgpu_err(g, "fatal error probing nvlink, bailing out");
+                        goto err_free_irq;
+                }
+                /* Enable Semaphore SHIM on nvlink only for now. */
+                __nvgpu_set_enabled(g, NVGPU_SUPPORT_NVLINK, false);
+                __nvgpu_set_enabled(g, NVGPU_HAS_SYNCPOINTS, false);
+        } else {
+                err = nvgpu_nvhost_syncpt_init(g);
+                if (err) {
+                        if (err != -ENOSYS) {
+                                nvgpu_err(g, "syncpt init failed");
+                                goto err_free_irq;
+                        }
+                }
+        }
+
+        return 0;
+
+err_free_irq:
+        nvgpu_free_irq(g);
+err_disable_msi:
+#if defined(CONFIG_PCI_MSI)
+        if (g->msi_enabled)
+                pci_disable_msi(pdev);
+#endif
+err_free_platform:
+        nvgpu_kfree(g, platform);
+err_free_l:
+        kfree(l);
+        return err;
+}
+
+static void nvgpu_pci_remove(struct pci_dev *pdev)
+{
+        struct gk20a *g = get_gk20a(&pdev->dev);
+        struct device *dev = dev_from_gk20a(g);
+        int err;
+
+        /* no support yet for unbind if DGPU is in VGPU mode */
+        if (gk20a_gpu_is_virtual(dev))
+                return;
+
+        err = nvgpu_nvlink_deinit(g);
+        WARN(err, "gpu failed to remove nvlink");
+
+        gk20a_driver_start_unload(g);
+
+        err = nvgpu_quiesce(g);
+        /* TODO: handle failure to idle */
+        WARN(err, "gpu failed to idle during driver removal");
+
+        nvgpu_free_irq(g);
+
+        nvgpu_remove(dev, &nvgpu_pci_class);
+
+#if defined(CONFIG_PCI_MSI)
+        if (g->msi_enabled)
+                pci_disable_msi(pdev);
+        else {
+                /* IRQ does not need to be enabled in MSI as the line is not
+                 * shared
+                 */
+                enable_irq(g->irq_stall);
+        }
+#endif
+        nvgpu_pci_pm_deinit(&pdev->dev);
+
+        /* free allocated platform data space */
+        gk20a_get_platform(&pdev->dev)->g = NULL;
+        nvgpu_kfree(g, gk20a_get_platform(&pdev->dev));
+
+        gk20a_put(g);
+}
+
+static struct pci_driver nvgpu_pci_driver = {
+        .name = "nvgpu",
+        .id_table = nvgpu_pci_table,
+        .probe = nvgpu_pci_probe,
+        .remove = nvgpu_pci_remove,
+#ifdef CONFIG_PM
+        .driver.pm = &nvgpu_pci_pm_ops,
+#endif
+};
+
+int __init nvgpu_pci_init(void)
+{
+        int ret;
+
+        ret = class_register(&nvgpu_pci_class);
+        if (ret)
+                return ret;
+
+        return pci_register_driver(&nvgpu_pci_driver);
+}
+
+void __exit nvgpu_pci_exit(void)
+{
+        pci_unregister_driver(&nvgpu_pci_driver);
+        class_unregister(&nvgpu_pci_class);
+}
diff --git a/include/os/linux/pci.h b/include/os/linux/pci.h
new file mode 100644
index 0000000..cc6b77b
--- /dev/null
+++ b/include/os/linux/pci.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef NVGPU_PCI_H
+#define NVGPU_PCI_H
+
+#ifdef CONFIG_GK20A_PCI
+int nvgpu_pci_init(void);
+void nvgpu_pci_exit(void);
+#else
+static inline int nvgpu_pci_init(void) { return 0; }
+static inline void nvgpu_pci_exit(void) {}
+#endif
+
+#endif
diff --git a/include/os/linux/pci_usermode.c b/include/os/linux/pci_usermode.c
new file mode 100644
index 0000000..270b834
--- /dev/null
+++ b/include/os/linux/pci_usermode.c
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <nvgpu/types.h>
+
+#include <nvgpu/hw/gv11b/hw_usermode_gv11b.h>
+
+#include "os_linux.h"
+
+void nvgpu_pci_init_usermode_support(struct nvgpu_os_linux *l)
+{
+        l->usermode_regs = l->regs + usermode_cfg0_r();
+        l->usermode_regs_saved = l->usermode_regs;
+}
diff --git a/include/os/linux/pci_usermode.h b/include/os/linux/pci_usermode.h
new file mode 100644
index 0000000..25a08d2
--- /dev/null
+++ b/include/os/linux/pci_usermode.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __NVGPU_PCI_USERMODE_H__
+#define __NVGPU_PCI_USERMODE_H__
+
+struct nvgpu_os_linux;
+
+void nvgpu_pci_init_usermode_support(struct nvgpu_os_linux *l);
+
+#endif
diff --git a/include/os/linux/platform_gk20a.h b/include/os/linux/platform_gk20a.h
new file mode 100644
index 0000000..adec860
--- /dev/null
+++ b/include/os/linux/platform_gk20a.h
@@ -0,0 +1,329 @@
+/*
+ * GK20A Platform (SoC) Interface
+ *
+ * Copyright (c) 2014-2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#ifndef _GK20A_PLATFORM_H_
+#define _GK20A_PLATFORM_H_
+
+#include <linux/device.h>
+
+#include <nvgpu/lock.h>
+#include <nvgpu/gk20a.h>
+
+#define GK20A_CLKS_MAX          4
+
+struct gk20a;
+struct channel_gk20a;
+struct gr_ctx_buffer_desc;
+struct gk20a_scale_profile;
+
+struct secure_page_buffer {
+        void (*destroy)(struct gk20a *, struct secure_page_buffer *);
+        size_t size;
+        dma_addr_t phys;
+        size_t used;
+};
+
+struct gk20a_platform {
+        /* Populated by the gk20a driver before probing the platform. */
+        struct gk20a *g;
+
+        /* Should be populated at probe. */
+        bool can_railgate_init;
+
+        /* Should be populated at probe. */
+        bool can_tpc_powergate;
+
+        /* Should be populated at probe. */
+        bool can_elpg_init;
+
+        /* Should be populated at probe. */
+        bool has_syncpoints;
+
+        /* channel limit after which to start aggressive sync destroy */
+        unsigned int aggressive_sync_destroy_thresh;
+
+        /* flag to set sync destroy aggressiveness */
+        bool aggressive_sync_destroy;
+
+        /* set if ASPM should be disabled on boot; only makes sense for PCI */
+        bool disable_aspm;
+
+        /* Set if the platform can unify the small/large address spaces. */
+        bool unify_address_spaces;
+
+        /* Clock configuration is stored here. Platform probe is responsible
+         * for filling this data. */
+        struct clk *clk[GK20A_CLKS_MAX];
+        int num_clks;
+        int maxmin_clk_id;
+
+#ifdef CONFIG_RESET_CONTROLLER
+        /* Reset control for device */
+        struct reset_control *reset_control;
+#endif
+        /* valid TPC-MASK */
+        u32 valid_tpc_mask[MAX_TPC_PG_CONFIGS];
+
+        /* Delay before rail gated */
+        int railgate_delay_init;
+
+        /* init value for slowdown factor */
+        u8 ldiv_slowdown_factor_init;
+
+        /* Second Level Clock Gating: true = enable false = disable */
+        bool enable_slcg;
+
+        /* Block Level Clock Gating: true = enable flase = disable */
+        bool enable_blcg;
+
+        /* Engine Level Clock Gating: true = enable flase = disable */
+        bool enable_elcg;
+
+        /* Should be populated at probe. */
+        bool can_slcg;
+
+        /* Should be populated at probe. */
+        bool can_blcg;
+
+        /* Should be populated at probe. */
+        bool can_elcg;
+
+        /* Engine Level Power Gating: true = enable flase = disable */
+        bool enable_elpg;
+
+        /* Adaptative ELPG: true = enable flase = disable */
+        bool enable_aelpg;
+
+        /* PMU Perfmon: true = enable false = disable */
+        bool enable_perfmon;
+
+        /* Memory System Clock Gating: true = enable flase = disable*/
+        bool enable_mscg;
+
+        /* Timeout for per-channel watchdog (in mS) */
+        u32 ch_wdt_timeout_ms;
+
+        /* Disable big page support */
+        bool disable_bigpage;
+
+        /*
+         * gk20a_do_idle() API can take GPU either into rail gate or CAR reset
+         * This flag can be used to force CAR reset case instead of rail gate
+         */
+        bool force_reset_in_do_idle;
+
+        /* guest/vm id, needed for IPA to PA transation */
+        int vmid;
+
+        /* Initialize the platform interface of the gk20a driver.
+         *
+         * The platform implementation of this function must
+         *   - set the power and clocks of the gk20a device to a known
+         *     state, and
+         *   - populate the gk20a_platform structure (a pointer to the
+         *     structure can be obtained by calling gk20a_get_platform).
+         *
+         * After this function is finished, the driver will initialise
+         * pm runtime and genpd based on the platform configuration.
+         */
+        int (*probe)(struct device *dev);
+
+        /* Second stage initialisation - called once all power management
+         * initialisations are done.
+         */
+        int (*late_probe)(struct device *dev);
+
+        /* Remove device after power management has been done
+         */
+        int (*remove)(struct device *dev);
+
+        /* Poweron platform dependencies */
+        int (*busy)(struct device *dev);
+
+        /* Powerdown platform dependencies */
+        void (*idle)(struct device *dev);
+
+        /* Preallocated VPR buffer for kernel */
+        size_t secure_buffer_size;
+        struct secure_page_buffer secure_buffer;
+
+        /* Device is going to be suspended */
+        int (*suspend)(struct device *);
+
+        /* Device is going to be resumed */
+        int (*resume)(struct device *);
+
+        /* Called to turn off the device */
+        int (*railgate)(struct device *dev);
+
+        /* Called to turn on the device */
+        int (*unrailgate)(struct device *dev);
+        struct nvgpu_mutex railgate_lock;
+
+        /* Called to check state of device */
+        bool (*is_railgated)(struct device *dev);
+
+        /* get supported frequency list */
+        int (*get_clk_freqs)(struct device *pdev,
+                                unsigned long **freqs, int *num_freqs);
+
+        /* clk related supported functions */
+        long (*clk_round_rate)(struct device *dev,
+                                unsigned long rate);
+
+        /* Called to register GPCPLL with common clk framework */
+        int (*clk_register)(struct gk20a *g);
+
+        /* platform specific scale init quirks */
+        void (*initscale)(struct device *dev);
+
+        /* Postscale callback is called after frequency change */
+        void (*postscale)(struct device *dev,
+                          unsigned long freq);
+
+        /* Pre callback is called before frequency change */
+        void (*prescale)(struct device *dev);
+
+        /* Set TPC_PG_MASK during probe */
+        void (*set_tpc_pg_mask)(struct device *dev, u32 tpc_pg_mask);
+
+        /* Devfreq governor name. If scaling is enabled, we request
+         * this governor to be used in scaling */
+        const char *devfreq_governor;
+
+        /* Quality of service notifier callback. If this is set, the scaling
+         * routines will register a callback to Qos. Each time we receive
+         * a new value, this callback gets called.  */
+        int (*qos_notify)(struct notifier_block *nb,
+                          unsigned long n, void *p);
+
+        /* Called as part of debug dump. If the gpu gets hung, this function
+         * is responsible for delivering all necessary debug data of other
+         * hw units which may interact with the gpu without direct supervision
+         * of the CPU.
+         */
+        void (*dump_platform_dependencies)(struct device *dev);
+
+        /* Defined when SMMU stage-2 is enabled, and we need to use physical
+         * addresses (not IPA). This is the case for GV100 nvlink in HV+L
+         * configuration, when dGPU is in pass-through mode.
+         */
+        u64 (*phys_addr)(struct gk20a *g, u64 ipa);
+
+        /* Callbacks to assert/deassert GPU reset */
+        int (*reset_assert)(struct device *dev);
+        int (*reset_deassert)(struct device *dev);
+        struct clk *clk_reset;
+        struct dvfs_rail *gpu_rail;
+
+        bool virtual_dev;
+#ifdef CONFIG_TEGRA_GR_VIRTUALIZATION
+        void *vgpu_priv;
+#endif
+        /* source frequency for ptimer in hz */
+        u32 ptimer_src_freq;
+
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        bool has_cde;
+#endif
+
+        /* soc name for finding firmware files */
+        const char *soc_name;
+
+        /* false if vidmem aperture actually points to sysmem */
+        bool honors_aperture;
+        /* unified or split memory with separate vidmem? */
+        bool unified_memory;
+        /* WAR for gm20b chips. */
+        bool force_128K_pmu_vm;
+
+        /*
+         * DMA mask for Linux (both coh and non-coh). If not set defaults to
+         * 0x3ffffffff (i.e a 34 bit mask).
+         */
+        u64 dma_mask;
+
+        /* minimum supported VBIOS version */
+        u32 vbios_min_version;
+
+        /* true if we run preos microcode on this board */
+        bool run_preos;
+
+        /* true if we need to program sw threshold for
+         * power limits
+         */
+        bool hardcode_sw_threshold;
+
+        /* i2c device index, port and address for INA3221 */
+        u32 ina3221_dcb_index;
+        u32 ina3221_i2c_address;
+        u32 ina3221_i2c_port;
+
+        /* stream id to use */
+        u32 ltc_streamid;
+
+        /* synchronized access to platform->clk_get_freqs */
+        struct nvgpu_mutex clk_get_freq_lock;
+};
+
+static inline struct gk20a_platform *gk20a_get_platform(
+                struct device *dev)
+{
+        return (struct gk20a_platform *)dev_get_drvdata(dev);
+}
+
+#ifdef CONFIG_TEGRA_GK20A
+extern struct gk20a_platform gm20b_tegra_platform;
+extern struct gk20a_platform gp10b_tegra_platform;
+extern struct gk20a_platform gv11b_tegra_platform;
+#ifdef CONFIG_TEGRA_GR_VIRTUALIZATION
+extern struct gk20a_platform vgpu_tegra_platform;
+extern struct gk20a_platform gv11b_vgpu_tegra_platform;
+#endif
+#endif
+
+int gk20a_tegra_busy(struct device *dev);
+void gk20a_tegra_idle(struct device *dev);
+void gk20a_tegra_debug_dump(struct device *pdev);
+
+static inline struct gk20a *get_gk20a(struct device *dev)
+{
+        return gk20a_get_platform(dev)->g;
+}
+static inline struct gk20a *gk20a_from_dev(struct device *dev)
+{
+        if (!dev)
+                return NULL;
+
+        return ((struct gk20a_platform *)dev_get_drvdata(dev))->g;
+}
+static inline bool gk20a_gpu_is_virtual(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+
+        return platform->virtual_dev;
+}
+
+static inline int support_gk20a_pmu(struct device *dev)
+{
+        if (IS_ENABLED(CONFIG_GK20A_PMU)) {
+                /* gPMU is not supported for vgpu */
+                return !gk20a_gpu_is_virtual(dev);
+        }
+
+        return 0;
+}
+
+#endif
diff --git a/include/os/linux/platform_gk20a_tegra.c b/include/os/linux/platform_gk20a_tegra.c
new file mode 100644
index 0000000..c39e4f0
--- /dev/null
+++ b/include/os/linux/platform_gk20a_tegra.c
@@ -0,0 +1,966 @@
+/*
+ * GK20A Tegra Platform Interface
+ *
+ * Copyright (c) 2014-2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/clkdev.h>
+#include <linux/of_platform.h>
+#include <linux/debugfs.h>
+#include <linux/platform_data/tegra_edp.h>
+#include <linux/delay.h>
+#include <uapi/linux/nvgpu.h>
+#include <linux/dma-buf.h>
+#include <linux/dma-attrs.h>
+#include <linux/nvmap.h>
+#include <linux/reset.h>
+#if defined(CONFIG_TEGRA_DVFS)
+#include <linux/tegra_soctherm.h>
+#endif
+#include <linux/platform/tegra/common.h>
+#include <linux/platform/tegra/mc.h>
+#include <linux/clk/tegra.h>
+#if defined(CONFIG_COMMON_CLK)
+#include <soc/tegra/tegra-dvfs.h>
+#endif
+#ifdef CONFIG_TEGRA_BWMGR
+#include <linux/platform/tegra/emc_bwmgr.h>
+#endif
+
+#include <linux/platform/tegra/tegra_emc.h>
+#include <soc/tegra/chip-id.h>
+
+#include <nvgpu/kmem.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/enabled.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/nvhost.h>
+
+#include <nvgpu/linux/dma.h>
+
+#include "gm20b/clk_gm20b.h"
+
+#include "scale.h"
+#include "platform_gk20a.h"
+#include "clk.h"
+#include "os_linux.h"
+
+#include "../../../arch/arm/mach-tegra/iomap.h"
+#include <soc/tegra/pmc.h>
+
+#define TEGRA_GK20A_BW_PER_FREQ 32
+#define TEGRA_GM20B_BW_PER_FREQ 64
+#define TEGRA_DDR3_BW_PER_FREQ 16
+#define TEGRA_DDR4_BW_PER_FREQ 16
+#define MC_CLIENT_GPU 34
+#define PMC_GPU_RG_CNTRL_0              0x2d4
+
+#ifdef CONFIG_COMMON_CLK
+#define GPU_RAIL_NAME "vdd-gpu"
+#else
+#define GPU_RAIL_NAME "vdd_gpu"
+#endif
+
+extern struct device tegra_vpr_dev;
+
+#ifdef CONFIG_TEGRA_BWMGR
+struct gk20a_emc_params {
+        unsigned long bw_ratio;
+        unsigned long freq_last_set;
+        struct tegra_bwmgr_client *bwmgr_cl;
+};
+#else
+struct gk20a_emc_params {
+        unsigned long bw_ratio;
+        unsigned long freq_last_set;
+};
+#endif
+
+#define MHZ_TO_HZ(x) ((x) * 1000000)
+#define HZ_TO_MHZ(x) ((x) / 1000000)
+
+static void gk20a_tegra_secure_page_destroy(struct gk20a *g,
+                                       struct secure_page_buffer *secure_buffer)
+{
+        DEFINE_DMA_ATTRS(attrs);
+        dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, __DMA_ATTR(attrs));
+        dma_free_attrs(&tegra_vpr_dev, secure_buffer->size,
+                        (void *)(uintptr_t)secure_buffer->phys,
+                        secure_buffer->phys, __DMA_ATTR(attrs));
+
+        secure_buffer->destroy = NULL;
+}
+
+static int gk20a_tegra_secure_alloc(struct gk20a *g,
+                             struct gr_ctx_buffer_desc *desc,
+                             size_t size)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        struct secure_page_buffer *secure_buffer = &platform->secure_buffer;
+        dma_addr_t phys;
+        struct sg_table *sgt;
+        struct page *page;
+        int err = 0;
+        size_t aligned_size = PAGE_ALIGN(size);
+
+        if (nvgpu_mem_is_valid(&desc->mem))
+                return 0;
+
+        /* We ran out of preallocated memory */
+        if (secure_buffer->used + aligned_size > secure_buffer->size) {
+                nvgpu_err(platform->g, "failed to alloc %zu bytes of VPR, %zu/%zu used",
+                                size, secure_buffer->used, secure_buffer->size);
+                return -ENOMEM;
+        }
+
+        phys = secure_buffer->phys + secure_buffer->used;
+
+        sgt = nvgpu_kzalloc(platform->g, sizeof(*sgt));
+        if (!sgt) {
+                nvgpu_err(platform->g, "failed to allocate memory");
+                return -ENOMEM;
+        }
+        err = sg_alloc_table(sgt, 1, GFP_KERNEL);
+        if (err) {
+                nvgpu_err(platform->g, "failed to allocate sg_table");
+                goto fail_sgt;
+        }
+        page = phys_to_page(phys);
+        sg_set_page(sgt->sgl, page, size, 0);
+        /* This bypasses SMMU for VPR during gmmu_map. */
+        sg_dma_address(sgt->sgl) = 0;
+
+        desc->destroy = NULL;
+
+        desc->mem.priv.sgt = sgt;
+        desc->mem.size = size;
+        desc->mem.aperture = APERTURE_SYSMEM;
+
+        secure_buffer->used += aligned_size;
+
+        return err;
+
+fail_sgt:
+        nvgpu_kfree(platform->g, sgt);
+        return err;
+}
+
+/*
+ * gk20a_tegra_get_emc_rate()
+ *
+ * This function returns the minimum emc clock based on gpu frequency
+ */
+
+static unsigned long gk20a_tegra_get_emc_rate(struct gk20a *g,
+                                struct gk20a_emc_params *emc_params)
+{
+        unsigned long gpu_freq, gpu_fmax_at_vmin;
+        unsigned long emc_rate, emc_scale;
+
+        gpu_freq = clk_get_rate(g->clk.tegra_clk);
+        gpu_fmax_at_vmin = tegra_dvfs_get_fmax_at_vmin_safe_t(
+                clk_get_parent(g->clk.tegra_clk));
+
+        /* When scaling emc, account for the gpu load when the
+         * gpu frequency is less than or equal to fmax@vmin. */
+        if (gpu_freq <= gpu_fmax_at_vmin)
+                emc_scale = min(g->pmu.load_avg, g->emc3d_ratio);
+        else
+                emc_scale = g->emc3d_ratio;
+
+        emc_rate =
+                (HZ_TO_MHZ(gpu_freq) * emc_params->bw_ratio * emc_scale) / 1000;
+
+        return MHZ_TO_HZ(emc_rate);
+}
+
+/*
+ * gk20a_tegra_prescale(profile, freq)
+ *
+ * This function informs EDP about changed constraints.
+ */
+
+static void gk20a_tegra_prescale(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        u32 avg = 0;
+
+        nvgpu_pmu_load_norm(g, &avg);
+        tegra_edp_notify_gpu_load(avg, clk_get_rate(g->clk.tegra_clk));
+}
+
+/*
+ * gk20a_tegra_calibrate_emc()
+ *
+ */
+
+static void gk20a_tegra_calibrate_emc(struct device *dev,
+                               struct gk20a_emc_params *emc_params)
+{
+        enum tegra_chipid cid = tegra_get_chip_id();
+        long gpu_bw, emc_bw;
+
+        /* store gpu bw based on soc */
+        switch (cid) {
+        case TEGRA210:
+                gpu_bw = TEGRA_GM20B_BW_PER_FREQ;
+                break;
+        case TEGRA124:
+        case TEGRA132:
+                gpu_bw = TEGRA_GK20A_BW_PER_FREQ;
+                break;
+        default:
+                gpu_bw = 0;
+                break;
+        }
+
+        /* TODO detect DDR type.
+         * Okay for now since DDR3 and DDR4 have the same BW ratio */
+        emc_bw = TEGRA_DDR3_BW_PER_FREQ;
+
+        /* Calculate the bandwidth ratio of gpu_freq <-> emc_freq
+         *   NOTE the ratio must come out as an integer */
+        emc_params->bw_ratio = (gpu_bw / emc_bw);
+}
+
+#ifdef CONFIG_TEGRA_BWMGR
+#ifdef CONFIG_TEGRA_DVFS
+static void gm20b_bwmgr_set_rate(struct gk20a_platform *platform, bool enb)
+{
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+        struct gk20a_emc_params *params;
+        unsigned long rate;
+
+        if (!profile || !profile->private_data)
+                return;
+
+        params = (struct gk20a_emc_params *)profile->private_data;
+        rate = (enb) ? params->freq_last_set : 0;
+        tegra_bwmgr_set_emc(params->bwmgr_cl, rate, TEGRA_BWMGR_SET_EMC_FLOOR);
+}
+#endif
+
+static void gm20b_tegra_postscale(struct device *dev, unsigned long freq)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+        struct gk20a_emc_params *emc_params;
+        unsigned long emc_rate;
+
+        if (!profile || !profile->private_data)
+                return;
+
+        emc_params = profile->private_data;
+        emc_rate = gk20a_tegra_get_emc_rate(get_gk20a(dev), emc_params);
+
+        if (emc_rate > tegra_bwmgr_get_max_emc_rate())
+                emc_rate = tegra_bwmgr_get_max_emc_rate();
+
+        emc_params->freq_last_set = emc_rate;
+        if (platform->is_railgated && platform->is_railgated(dev))
+                return;
+
+        tegra_bwmgr_set_emc(emc_params->bwmgr_cl, emc_rate,
+                        TEGRA_BWMGR_SET_EMC_FLOOR);
+
+}
+
+#endif
+
+#if defined(CONFIG_TEGRA_DVFS)
+/*
+ * gk20a_tegra_is_railgated()
+ *
+ * Check status of gk20a power rail
+ */
+
+static bool gk20a_tegra_is_railgated(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        bool ret = false;
+
+        if (!nvgpu_is_enabled(g, NVGPU_IS_FMODEL))
+                ret = !tegra_dvfs_is_rail_up(platform->gpu_rail);
+
+        return ret;
+}
+
+/*
+ * gm20b_tegra_railgate()
+ *
+ * Gate (disable) gm20b power rail
+ */
+
+static int gm20b_tegra_railgate(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        int ret = 0;
+
+        if (nvgpu_is_enabled(g, NVGPU_IS_FMODEL) ||
+            !tegra_dvfs_is_rail_up(platform->gpu_rail))
+                return 0;
+
+        tegra_mc_flush(MC_CLIENT_GPU);
+
+        udelay(10);
+
+        /* enable clamp */
+        tegra_pmc_writel_relaxed(0x1, PMC_GPU_RG_CNTRL_0);
+        tegra_pmc_readl(PMC_GPU_RG_CNTRL_0);
+
+        udelay(10);
+
+        platform->reset_assert(dev);
+
+        udelay(10);
+
+        /*
+         * GPCPLL is already disabled before entering this function; reference
+         * clocks are enabled until now - disable them just before rail gating
+         */
+        clk_disable_unprepare(platform->clk_reset);
+        clk_disable_unprepare(platform->clk[0]);
+        clk_disable_unprepare(platform->clk[1]);
+        if (platform->clk[3])
+                clk_disable_unprepare(platform->clk[3]);
+
+        udelay(10);
+
+        tegra_soctherm_gpu_tsens_invalidate(1);
+
+        if (tegra_dvfs_is_rail_up(platform->gpu_rail)) {
+                ret = tegra_dvfs_rail_power_down(platform->gpu_rail);
+                if (ret)
+                        goto err_power_off;
+        } else
+                pr_info("No GPU regulator?\n");
+
+#ifdef CONFIG_TEGRA_BWMGR
+        gm20b_bwmgr_set_rate(platform, false);
+#endif
+
+        return 0;
+
+err_power_off:
+        nvgpu_err(platform->g, "Could not railgate GPU");
+        return ret;
+}
+
+
+/*
+ * gm20b_tegra_unrailgate()
+ *
+ * Ungate (enable) gm20b power rail
+ */
+
+static int gm20b_tegra_unrailgate(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        struct gk20a *g = platform->g;
+        int ret = 0;
+        bool first = false;
+
+        if (nvgpu_is_enabled(g, NVGPU_IS_FMODEL))
+                return 0;
+
+        ret = tegra_dvfs_rail_power_up(platform->gpu_rail);
+        if (ret)
+                return ret;
+
+#ifdef CONFIG_TEGRA_BWMGR
+        gm20b_bwmgr_set_rate(platform, true);
+#endif
+
+        tegra_soctherm_gpu_tsens_invalidate(0);
+
+        if (!platform->clk_reset) {
+                platform->clk_reset = clk_get(dev, "gpu_gate");
+                if (IS_ERR(platform->clk_reset)) {
+                        nvgpu_err(g, "fail to get gpu reset clk");
+                        goto err_clk_on;
+                }
+        }
+
+        if (!first) {
+                ret = clk_prepare_enable(platform->clk_reset);
+                if (ret) {
+                        nvgpu_err(g, "could not turn on gpu_gate");
+                        goto err_clk_on;
+                }
+
+                ret = clk_prepare_enable(platform->clk[0]);
+                if (ret) {
+                        nvgpu_err(g, "could not turn on gpu pll");
+                        goto err_clk_on;
+                }
+                ret = clk_prepare_enable(platform->clk[1]);
+                if (ret) {
+                        nvgpu_err(g, "could not turn on pwr clock");
+                        goto err_clk_on;
+                }
+
+                if (platform->clk[3]) {
+                        ret = clk_prepare_enable(platform->clk[3]);
+                        if (ret) {
+                                nvgpu_err(g, "could not turn on fuse clock");
+                                goto err_clk_on;
+                        }
+                }
+        }
+
+        udelay(10);
+
+        platform->reset_assert(dev);
+
+        udelay(10);
+
+        tegra_pmc_writel_relaxed(0, PMC_GPU_RG_CNTRL_0);
+        tegra_pmc_readl(PMC_GPU_RG_CNTRL_0);
+
+        udelay(10);
+
+        clk_disable(platform->clk_reset);
+        platform->reset_deassert(dev);
+        clk_enable(platform->clk_reset);
+
+        /* Flush MC after boot/railgate/SC7 */
+        tegra_mc_flush(MC_CLIENT_GPU);
+
+        udelay(10);
+
+        tegra_mc_flush_done(MC_CLIENT_GPU);
+
+        udelay(10);
+
+        return 0;
+
+err_clk_on:
+        tegra_dvfs_rail_power_down(platform->gpu_rail);
+
+        return ret;
+}
+#endif
+
+
+static struct {
+        char *name;
+        unsigned long default_rate;
+} tegra_gk20a_clocks[] = {
+        {"gpu_ref", UINT_MAX},
+        {"pll_p_out5", 204000000},
+        {"emc", UINT_MAX},
+        {"fuse", UINT_MAX},
+};
+
+
+
+/*
+ * gk20a_tegra_get_clocks()
+ *
+ * This function finds clocks in tegra platform and populates
+ * the clock information to gk20a platform data.
+ */
+
+static int gk20a_tegra_get_clocks(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        char devname[16];
+        unsigned int i;
+        int ret = 0;
+
+        BUG_ON(GK20A_CLKS_MAX < ARRAY_SIZE(tegra_gk20a_clocks));
+
+        snprintf(devname, sizeof(devname), "tegra_%s", dev_name(dev));
+
+        platform->num_clks = 0;
+        for (i = 0; i < ARRAY_SIZE(tegra_gk20a_clocks); i++) {
+                long rate = tegra_gk20a_clocks[i].default_rate;
+                struct clk *c;
+
+                c = clk_get_sys(devname, tegra_gk20a_clocks[i].name);
+                if (IS_ERR(c)) {
+                        ret = PTR_ERR(c);
+                        goto err_get_clock;
+                }
+                rate = clk_round_rate(c, rate);
+                clk_set_rate(c, rate);
+                platform->clk[i] = c;
+        }
+        platform->num_clks = i;
+
+        return 0;
+
+err_get_clock:
+
+        while (i--)
+                clk_put(platform->clk[i]);
+        return ret;
+}
+
+#if defined(CONFIG_RESET_CONTROLLER) && defined(CONFIG_COMMON_CLK)
+static int gm20b_tegra_reset_assert(struct device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+
+        if (!platform->reset_control) {
+                WARN(1, "Reset control not initialized\n");
+                return -ENOSYS;
+        }
+
+        return reset_control_assert(platform->reset_control);
+}
+
+static int gm20b_tegra_reset_deassert(struct device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+
+        if (!platform->reset_control) {
+                WARN(1, "Reset control not initialized\n");
+                return -ENOSYS;
+        }
+
+        return reset_control_deassert(platform->reset_control);
+}
+#endif
+
+static void gk20a_tegra_scale_init(struct device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+        struct gk20a_emc_params *emc_params;
+        struct gk20a *g = platform->g;
+
+        if (!profile)
+                return;
+
+        if (profile->private_data)
+                return;
+
+        emc_params = nvgpu_kzalloc(platform->g, sizeof(*emc_params));
+        if (!emc_params)
+                return;
+
+        emc_params->freq_last_set = -1;
+        gk20a_tegra_calibrate_emc(dev, emc_params);
+
+#ifdef CONFIG_TEGRA_BWMGR
+        emc_params->bwmgr_cl = tegra_bwmgr_register(TEGRA_BWMGR_CLIENT_GPU);
+        if (!emc_params->bwmgr_cl) {
+                nvgpu_log_info(g, "%s Missing GPU BWMGR client\n", __func__);
+                return;
+        }
+#endif
+
+        profile->private_data = emc_params;
+}
+
+static void gk20a_tegra_scale_exit(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+        struct gk20a_emc_params *emc_params;
+
+        if (!profile)
+                return;
+
+        emc_params = profile->private_data;
+#ifdef CONFIG_TEGRA_BWMGR
+        tegra_bwmgr_unregister(emc_params->bwmgr_cl);
+#endif
+
+        nvgpu_kfree(platform->g, profile->private_data);
+}
+
+void gk20a_tegra_debug_dump(struct device *dev)
+{
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a *g = platform->g;
+
+        if (g->nvhost_dev)
+                nvgpu_nvhost_debug_dump_device(g->nvhost_dev);
+#endif
+}
+
+int gk20a_tegra_busy(struct device *dev)
+{
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a *g = platform->g;
+
+        if (g->nvhost_dev)
+                return nvgpu_nvhost_module_busy_ext(g->nvhost_dev);
+#endif
+        return 0;
+}
+
+void gk20a_tegra_idle(struct device *dev)
+{
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a *g = platform->g;
+
+        if (g->nvhost_dev)
+                nvgpu_nvhost_module_idle_ext(g->nvhost_dev);
+#endif
+}
+
+int gk20a_tegra_init_secure_alloc(struct gk20a_platform *platform)
+{
+        struct gk20a *g = platform->g;
+        struct secure_page_buffer *secure_buffer = &platform->secure_buffer;
+        DEFINE_DMA_ATTRS(attrs);
+        dma_addr_t iova;
+
+        if (nvgpu_is_enabled(g, NVGPU_IS_FMODEL))
+                return 0;
+
+        dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, __DMA_ATTR(attrs));
+        (void)dma_alloc_attrs(&tegra_vpr_dev, platform->secure_buffer_size, &iova,
+                                      GFP_KERNEL, __DMA_ATTR(attrs));
+        /* Some platforms disable VPR. In that case VPR allocations always
+         * fail. Just disable VPR usage in nvgpu in that case. */
+        if (dma_mapping_error(&tegra_vpr_dev, iova))
+                return 0;
+
+        secure_buffer->size = platform->secure_buffer_size;
+        secure_buffer->phys = iova;
+        secure_buffer->destroy = gk20a_tegra_secure_page_destroy;
+
+        g->ops.secure_alloc = gk20a_tegra_secure_alloc;
+        __nvgpu_set_enabled(g, NVGPU_SUPPORT_VPR, true);
+
+        return 0;
+}
+
+#ifdef CONFIG_COMMON_CLK
+static struct clk *gk20a_clk_get(struct gk20a *g)
+{
+        if (!g->clk.tegra_clk) {
+                struct clk *clk, *clk_parent;
+                char clk_dev_id[32];
+                struct device *dev = dev_from_gk20a(g);
+
+                snprintf(clk_dev_id, 32, "tegra_%s", dev_name(dev));
+
+                clk = clk_get_sys(clk_dev_id, "gpu");
+                if (IS_ERR(clk)) {
+                        nvgpu_err(g, "fail to get tegra gpu clk %s/gpu\n",
+                                  clk_dev_id);
+                        return NULL;
+                }
+
+                clk_parent = clk_get_parent(clk);
+                if (IS_ERR_OR_NULL(clk_parent)) {
+                        nvgpu_err(g, "fail to get tegra gpu clk parent%s/gpu\n",
+                                  clk_dev_id);
+                        return NULL;
+                }
+
+                g->clk.tegra_clk = clk;
+                g->clk.tegra_clk_parent = clk_parent;
+        }
+
+        return g->clk.tegra_clk;
+}
+
+static int gm20b_clk_prepare_ops(struct clk_hw *hw)
+{
+        struct clk_gk20a *clk = to_clk_gk20a(hw);
+        return gm20b_clk_prepare(clk);
+}
+
+static void gm20b_clk_unprepare_ops(struct clk_hw *hw)
+{
+        struct clk_gk20a *clk = to_clk_gk20a(hw);
+        gm20b_clk_unprepare(clk);
+}
+
+static int gm20b_clk_is_prepared_ops(struct clk_hw *hw)
+{
+        struct clk_gk20a *clk = to_clk_gk20a(hw);
+        return gm20b_clk_is_prepared(clk);
+}
+
+static unsigned long gm20b_recalc_rate_ops(struct clk_hw *hw, unsigned long parent_rate)
+{
+        struct clk_gk20a *clk = to_clk_gk20a(hw);
+        return gm20b_recalc_rate(clk, parent_rate);
+}
+
+static int gm20b_gpcclk_set_rate_ops(struct clk_hw *hw, unsigned long rate,
+                                 unsigned long parent_rate)
+{
+        struct clk_gk20a *clk = to_clk_gk20a(hw);
+        return gm20b_gpcclk_set_rate(clk, rate, parent_rate);
+}
+
+static long gm20b_round_rate_ops(struct clk_hw *hw, unsigned long rate,
+                             unsigned long *parent_rate)
+{
+        struct clk_gk20a *clk = to_clk_gk20a(hw);
+        return gm20b_round_rate(clk, rate, parent_rate);
+}
+
+static const struct clk_ops gm20b_clk_ops = {
+        .prepare = gm20b_clk_prepare_ops,
+        .unprepare = gm20b_clk_unprepare_ops,
+        .is_prepared = gm20b_clk_is_prepared_ops,
+        .recalc_rate = gm20b_recalc_rate_ops,
+        .set_rate = gm20b_gpcclk_set_rate_ops,
+        .round_rate = gm20b_round_rate_ops,
+};
+
+static int gm20b_register_gpcclk(struct gk20a *g)
+{
+        const char *parent_name = "pllg_ref";
+        struct clk_gk20a *clk = &g->clk;
+        struct clk_init_data init;
+        struct clk *c;
+        int err = 0;
+
+        /* make sure the clock is available */
+        if (!gk20a_clk_get(g))
+                return -ENOSYS;
+
+        err = gm20b_init_clk_setup_sw(g);
+        if (err)
+                return err;
+
+        init.name = "gpcclk";
+        init.ops = &gm20b_clk_ops;
+        init.parent_names = &parent_name;
+        init.num_parents = 1;
+        init.flags = 0;
+
+        /* Data in .init is copied by clk_register(), so stack variable OK */
+        clk->hw.init = &init;
+        c = clk_register(dev_from_gk20a(g), &clk->hw);
+        if (IS_ERR(c)) {
+                nvgpu_err(g, "Failed to register GPCPLL clock");
+                return -EINVAL;
+        }
+
+        clk->g = g;
+        clk_register_clkdev(c, "gpcclk", "gpcclk");
+
+        return err;
+}
+#endif /* CONFIG_COMMON_CLK */
+
+static int gk20a_tegra_probe(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        struct device_node *np = dev->of_node;
+        bool joint_xpu_rail = false;
+        int ret;
+        struct gk20a *g = platform->g;
+
+#ifdef CONFIG_COMMON_CLK
+        /* DVFS is not guaranteed to be initialized at the time of probe on
+         * kernels with Common Clock Framework enabled.
+         */
+        if (!platform->gpu_rail) {
+                platform->gpu_rail = tegra_dvfs_get_rail_by_name(GPU_RAIL_NAME);
+                if (!platform->gpu_rail) {
+                        nvgpu_log_info(g, "deferring probe no gpu_rail");
+                        return -EPROBE_DEFER;
+                }
+        }
+
+        if (!tegra_dvfs_is_rail_ready(platform->gpu_rail)) {
+                nvgpu_log_info(g, "deferring probe gpu_rail not ready");
+                return -EPROBE_DEFER;
+        }
+#endif
+
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        ret = nvgpu_get_nvhost_dev(platform->g);
+        if (ret)
+                return ret;
+#endif
+
+#ifdef CONFIG_OF
+        joint_xpu_rail = of_property_read_bool(of_chosen,
+                                "nvidia,tegra-joint_xpu_rail");
+#endif
+
+        if (joint_xpu_rail) {
+                nvgpu_log_info(g, "XPU rails are joint\n");
+                platform->can_railgate_init = false;
+                __nvgpu_set_enabled(g, NVGPU_CAN_RAILGATE, false);
+        }
+
+        platform->g->clk.gpc_pll.id = GK20A_GPC_PLL;
+        if (tegra_get_chip_id() == TEGRA210) {
+                /* WAR for bug 1547668: Disable railgating and scaling
+                   irrespective of platform data if the rework was not made. */
+                np = of_find_node_by_path("/gpu-dvfs-rework");
+                if (!(np && of_device_is_available(np))) {
+                        platform->devfreq_governor = "";
+                        dev_warn(dev, "board does not support scaling");
+                }
+                platform->g->clk.gpc_pll.id = GM20B_GPC_PLL_B1;
+                if (tegra_chip_get_revision() > TEGRA210_REVISION_A04p)
+                        platform->g->clk.gpc_pll.id = GM20B_GPC_PLL_C1;
+        }
+
+        if (tegra_get_chip_id() == TEGRA132)
+                platform->soc_name = "tegra13x";
+
+        gk20a_tegra_get_clocks(dev);
+        nvgpu_linux_init_clk_support(platform->g);
+        ret = gk20a_tegra_init_secure_alloc(platform);
+        if (ret)
+                return ret;
+
+        if (platform->clk_register) {
+                ret = platform->clk_register(platform->g);
+                if (ret)
+                        return ret;
+        }
+
+        return 0;
+}
+
+static int gk20a_tegra_late_probe(struct device *dev)
+{
+        return 0;
+}
+
+static int gk20a_tegra_remove(struct device *dev)
+{
+        /* deinitialise tegra specific scaling quirks */
+        gk20a_tegra_scale_exit(dev);
+
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        nvgpu_free_nvhost_dev(get_gk20a(dev));
+#endif
+
+        return 0;
+}
+
+static int gk20a_tegra_suspend(struct device *dev)
+{
+        tegra_edp_notify_gpu_load(0, 0);
+        return 0;
+}
+
+#if defined(CONFIG_COMMON_CLK)
+static long gk20a_round_clk_rate(struct device *dev, unsigned long rate)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a *g = platform->g;
+
+        /* make sure the clock is available */
+        if (!gk20a_clk_get(g))
+                return rate;
+
+        return clk_round_rate(clk_get_parent(g->clk.tegra_clk), rate);
+}
+
+static int gk20a_clk_get_freqs(struct device *dev,
+                                unsigned long **freqs, int *num_freqs)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a *g = platform->g;
+
+        /* make sure the clock is available */
+        if (!gk20a_clk_get(g))
+                return -ENOSYS;
+
+        return tegra_dvfs_get_freqs(clk_get_parent(g->clk.tegra_clk),
+                                freqs, num_freqs);
+}
+#endif
+
+struct gk20a_platform gm20b_tegra_platform = {
+        .has_syncpoints = true,
+        .aggressive_sync_destroy_thresh = 64,
+
+        /* power management configuration */
+        .railgate_delay_init    = 500,
+        .can_railgate_init      = true,
+        .can_elpg_init          = true,
+        .enable_slcg            = true,
+        .enable_blcg            = true,
+        .enable_elcg            = true,
+        .can_slcg               = true,
+        .can_blcg               = true,
+        .can_elcg               = true,
+        .enable_elpg            = true,
+        .enable_aelpg           = true,
+        .enable_perfmon         = true,
+        .ptimer_src_freq        = 19200000,
+
+        .force_reset_in_do_idle = false,
+
+        .ch_wdt_timeout_ms = 5000,
+
+        .probe = gk20a_tegra_probe,
+        .late_probe = gk20a_tegra_late_probe,
+        .remove = gk20a_tegra_remove,
+        /* power management callbacks */
+        .suspend = gk20a_tegra_suspend,
+
+#if defined(CONFIG_TEGRA_DVFS)
+        .railgate = gm20b_tegra_railgate,
+        .unrailgate = gm20b_tegra_unrailgate,
+        .is_railgated = gk20a_tegra_is_railgated,
+#endif
+
+        .busy = gk20a_tegra_busy,
+        .idle = gk20a_tegra_idle,
+
+#if defined(CONFIG_RESET_CONTROLLER) && defined(CONFIG_COMMON_CLK)
+        .reset_assert = gm20b_tegra_reset_assert,
+        .reset_deassert = gm20b_tegra_reset_deassert,
+#else
+        .reset_assert = gk20a_tegra_reset_assert,
+        .reset_deassert = gk20a_tegra_reset_deassert,
+#endif
+
+#if defined(CONFIG_COMMON_CLK)
+        .clk_round_rate = gk20a_round_clk_rate,
+        .get_clk_freqs = gk20a_clk_get_freqs,
+#endif
+
+#ifdef CONFIG_COMMON_CLK
+        .clk_register = gm20b_register_gpcclk,
+#endif
+
+        /* frequency scaling configuration */
+        .initscale = gk20a_tegra_scale_init,
+        .prescale = gk20a_tegra_prescale,
+#ifdef CONFIG_TEGRA_BWMGR
+        .postscale = gm20b_tegra_postscale,
+#endif
+        .devfreq_governor = "nvhost_podgov",
+        .qos_notify = gk20a_scale_qos_notify,
+
+        .dump_platform_dependencies = gk20a_tegra_debug_dump,
+
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        .has_cde = true,
+#endif
+
+        .soc_name = "tegra21x",
+
+        .unified_memory = true,
+        .dma_mask = DMA_BIT_MASK(34),
+        .force_128K_pmu_vm = true,
+
+        .secure_buffer_size = 335872,
+};
diff --git a/include/os/linux/platform_gk20a_tegra.h b/include/os/linux/platform_gk20a_tegra.h
new file mode 100644
index 0000000..f7d5040
--- /dev/null
+++ b/include/os/linux/platform_gk20a_tegra.h
@@ -0,0 +1,23 @@
+/*
+ * GK20A Platform (SoC) Interface
+ *
+ * Copyright (c) 2014-2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#ifndef _NVGPU_PLATFORM_GK20A_TEGRA_H_
+#define _NVGPU_PLATFORM_GK20A_TEGRA_H_
+
+struct gk20a_platform;
+
+int gk20a_tegra_init_secure_alloc(struct gk20a_platform *platform);
+
+#endif
diff --git a/include/os/linux/platform_gp10b.h b/include/os/linux/platform_gp10b.h
new file mode 100644
index 0000000..d256d12
--- /dev/null
+++ b/include/os/linux/platform_gp10b.h
@@ -0,0 +1,39 @@
+/*
+ * GP10B Platform (SoC) Interface
+ *
+ * Copyright (c) 2014-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _GP10B_PLATFORM_H_
+#define _GP10B_PLATFORM_H_
+
+struct device;
+
+int gp10b_tegra_get_clocks(struct device *dev);
+int gp10b_tegra_reset_assert(struct device *dev);
+int gp10b_tegra_reset_deassert(struct device *dev);
+void gp10b_tegra_scale_init(struct device *dev);
+long gp10b_round_clk_rate(struct device *dev, unsigned long rate);
+int gp10b_clk_get_freqs(struct device *dev,
+                        unsigned long **freqs, int *num_freqs);
+void gp10b_tegra_prescale(struct device *dev);
+void gp10b_tegra_postscale(struct device *pdev, unsigned long freq);
+#endif
diff --git a/include/os/linux/platform_gp10b_tegra.c b/include/os/linux/platform_gp10b_tegra.c
new file mode 100644
index 0000000..9bf8d63
--- /dev/null
+++ b/include/os/linux/platform_gp10b_tegra.c
@@ -0,0 +1,510 @@
+/*
+ * GP10B Tegra Platform Interface
+ *
+ * Copyright (c) 2014-2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/of_platform.h>
+#include <linux/debugfs.h>
+#include <linux/dma-buf.h>
+#include <linux/nvmap.h>
+#include <linux/reset.h>
+#include <linux/platform/tegra/emc_bwmgr.h>
+
+#include <uapi/linux/nvgpu.h>
+
+#include <soc/tegra/tegra_bpmp.h>
+#include <soc/tegra/tegra_powergate.h>
+#include <soc/tegra/tegra-bpmp-dvfs.h>
+
+#include <dt-bindings/memory/tegra-swgroup.h>
+
+#include <nvgpu/kmem.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/enabled.h>
+#include <nvgpu/hashtable.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/nvhost.h>
+
+#include "os_linux.h"
+
+#include "clk.h"
+
+#include "platform_gk20a.h"
+#include "platform_gk20a_tegra.h"
+#include "platform_gp10b.h"
+#include "platform_gp10b_tegra.h"
+#include "scale.h"
+
+/* Select every GP10B_FREQ_SELECT_STEP'th frequency from h/w table */
+#define GP10B_FREQ_SELECT_STEP  8
+/* Allow limited set of frequencies to be available */
+#define GP10B_NUM_SUPPORTED_FREQS 15
+/* Max number of freq supported in h/w */
+#define GP10B_MAX_SUPPORTED_FREQS 120
+static unsigned long
+gp10b_freq_table[GP10B_MAX_SUPPORTED_FREQS / GP10B_FREQ_SELECT_STEP];
+
+static bool freq_table_init_complete;
+static int num_supported_freq;
+
+#define TEGRA_GP10B_BW_PER_FREQ 64
+#define TEGRA_DDR4_BW_PER_FREQ 16
+
+#define EMC_BW_RATIO  (TEGRA_GP10B_BW_PER_FREQ / TEGRA_DDR4_BW_PER_FREQ)
+
+#define GPCCLK_INIT_RATE 1000000000
+
+static struct {
+        char *name;
+        unsigned long default_rate;
+} tegra_gp10b_clocks[] = {
+        {"gpu", GPCCLK_INIT_RATE},
+        {"gpu_sys", 204000000} };
+
+/*
+ * gp10b_tegra_get_clocks()
+ *
+ * This function finds clocks in tegra platform and populates
+ * the clock information to gp10b platform data.
+ */
+
+int gp10b_tegra_get_clocks(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        unsigned int i;
+
+        platform->num_clks = 0;
+        for (i = 0; i < ARRAY_SIZE(tegra_gp10b_clocks); i++) {
+                long rate = tegra_gp10b_clocks[i].default_rate;
+                struct clk *c;
+
+                c = clk_get(dev, tegra_gp10b_clocks[i].name);
+                if (IS_ERR(c)) {
+                        nvgpu_err(platform->g, "cannot get clock %s",
+                                        tegra_gp10b_clocks[i].name);
+                } else {
+                        clk_set_rate(c, rate);
+                        platform->clk[i] = c;
+                }
+        }
+        platform->num_clks = i;
+
+        if (platform->clk[0]) {
+                i = tegra_bpmp_dvfs_get_clk_id(dev->of_node,
+                                               tegra_gp10b_clocks[0].name);
+                if (i > 0)
+                        platform->maxmin_clk_id = i;
+        }
+
+        return 0;
+}
+
+void gp10b_tegra_scale_init(struct device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+        struct tegra_bwmgr_client *bwmgr_handle;
+
+        if (!profile)
+                return;
+
+        if ((struct tegra_bwmgr_client *)profile->private_data)
+                return;
+
+        bwmgr_handle = tegra_bwmgr_register(TEGRA_BWMGR_CLIENT_GPU);
+        if (!bwmgr_handle)
+                return;
+
+        profile->private_data = (void *)bwmgr_handle;
+}
+
+static void gp10b_tegra_scale_exit(struct device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+
+        if (profile && profile->private_data)
+                tegra_bwmgr_unregister(
+                        (struct tegra_bwmgr_client *)profile->private_data);
+}
+
+static int gp10b_tegra_probe(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        bool joint_xpu_rail = false;
+        struct gk20a *g = platform->g;
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        int ret;
+
+        ret = nvgpu_get_nvhost_dev(platform->g);
+        if (ret)
+                return ret;
+#endif
+
+        ret = gk20a_tegra_init_secure_alloc(platform);
+        if (ret)
+                return ret;
+
+        platform->disable_bigpage = !device_is_iommuable(dev);
+
+        platform->g->gr.ctx_vars.dump_ctxsw_stats_on_channel_close
+                = false;
+        platform->g->gr.ctx_vars.dump_ctxsw_stats_on_channel_close
+                = false;
+
+        platform->g->gr.ctx_vars.force_preemption_gfxp = false;
+        platform->g->gr.ctx_vars.force_preemption_cilp = false;
+
+#ifdef CONFIG_OF
+        joint_xpu_rail = of_property_read_bool(of_chosen,
+                                "nvidia,tegra-joint_xpu_rail");
+#endif
+
+        if (joint_xpu_rail) {
+                nvgpu_log_info(g, "XPU rails are joint\n");
+                platform->can_railgate_init = false;
+                __nvgpu_set_enabled(g, NVGPU_CAN_RAILGATE, false);
+        }
+
+        gp10b_tegra_get_clocks(dev);
+        nvgpu_linux_init_clk_support(platform->g);
+
+        nvgpu_mutex_init(&platform->clk_get_freq_lock);
+
+        platform->g->ops.clk.support_clk_freq_controller = true;
+
+        return 0;
+}
+
+static int gp10b_tegra_late_probe(struct device *dev)
+{
+        return 0;
+}
+
+static int gp10b_tegra_remove(struct device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+
+        /* deinitialise tegra specific scaling quirks */
+        gp10b_tegra_scale_exit(dev);
+
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        nvgpu_free_nvhost_dev(get_gk20a(dev));
+#endif
+
+        nvgpu_mutex_destroy(&platform->clk_get_freq_lock);
+
+        return 0;
+}
+
+static bool gp10b_tegra_is_railgated(struct device *dev)
+{
+        bool ret = false;
+
+        if (tegra_bpmp_running())
+                ret = !tegra_powergate_is_powered(TEGRA186_POWER_DOMAIN_GPU);
+
+        return ret;
+}
+
+static int gp10b_tegra_railgate(struct device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+
+        /* remove emc frequency floor */
+        if (profile)
+                tegra_bwmgr_set_emc(
+                        (struct tegra_bwmgr_client *)profile->private_data,
+                        0, TEGRA_BWMGR_SET_EMC_FLOOR);
+
+        if (tegra_bpmp_running() &&
+            tegra_powergate_is_powered(TEGRA186_POWER_DOMAIN_GPU)) {
+                int i;
+                for (i = 0; i < platform->num_clks; i++) {
+                        if (platform->clk[i])
+                                clk_disable_unprepare(platform->clk[i]);
+                }
+                tegra_powergate_partition(TEGRA186_POWER_DOMAIN_GPU);
+        }
+        return 0;
+}
+
+static int gp10b_tegra_unrailgate(struct device *dev)
+{
+        int ret = 0;
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+
+        if (tegra_bpmp_running()) {
+                int i;
+                ret = tegra_unpowergate_partition(TEGRA186_POWER_DOMAIN_GPU);
+                for (i = 0; i < platform->num_clks; i++) {
+                        if (platform->clk[i])
+                                clk_prepare_enable(platform->clk[i]);
+                }
+        }
+
+        /* to start with set emc frequency floor to max rate*/
+        if (profile)
+                tegra_bwmgr_set_emc(
+                        (struct tegra_bwmgr_client *)profile->private_data,
+                        tegra_bwmgr_get_max_emc_rate(),
+                        TEGRA_BWMGR_SET_EMC_FLOOR);
+        return ret;
+}
+
+static int gp10b_tegra_suspend(struct device *dev)
+{
+        return 0;
+}
+
+int gp10b_tegra_reset_assert(struct device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        int ret = 0;
+
+        if (!platform->reset_control)
+                return -EINVAL;
+
+        ret = reset_control_assert(platform->reset_control);
+
+        return ret;
+}
+
+int gp10b_tegra_reset_deassert(struct device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        int ret = 0;
+
+        if (!platform->reset_control)
+                return -EINVAL;
+
+        ret = reset_control_deassert(platform->reset_control);
+
+        return ret;
+}
+
+void gp10b_tegra_prescale(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        u32 avg = 0;
+
+        nvgpu_log_fn(g, " ");
+
+        nvgpu_pmu_load_norm(g, &avg);
+
+        nvgpu_log_fn(g, "done");
+}
+
+void gp10b_tegra_postscale(struct device *pdev,
+                                        unsigned long freq)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(pdev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+        struct gk20a *g = get_gk20a(pdev);
+        unsigned long emc_rate;
+
+        nvgpu_log_fn(g, " ");
+        if (profile && profile->private_data &&
+                        !platform->is_railgated(pdev)) {
+                unsigned long emc_scale;
+
+                if (freq <= gp10b_freq_table[0])
+                        emc_scale = 0;
+                else
+                        emc_scale = g->emc3d_ratio;
+
+                emc_rate = (freq * EMC_BW_RATIO * emc_scale) / 1000;
+
+                if (emc_rate > tegra_bwmgr_get_max_emc_rate())
+                        emc_rate = tegra_bwmgr_get_max_emc_rate();
+
+                tegra_bwmgr_set_emc(
+                        (struct tegra_bwmgr_client *)profile->private_data,
+                        emc_rate, TEGRA_BWMGR_SET_EMC_FLOOR);
+        }
+        nvgpu_log_fn(g, "done");
+}
+
+long gp10b_round_clk_rate(struct device *dev, unsigned long rate)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gk20a_scale_profile *profile = g->scale_profile;
+        unsigned long *freq_table = profile->devfreq_profile.freq_table;
+        int max_states = profile->devfreq_profile.max_state;
+        int i;
+
+        for (i = 0; i < max_states; ++i)
+                if (freq_table[i] >= rate)
+                        return freq_table[i];
+
+        return freq_table[max_states - 1];
+}
+
+int gp10b_clk_get_freqs(struct device *dev,
+                                unsigned long **freqs, int *num_freqs)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a *g = platform->g;
+        unsigned long max_rate;
+        unsigned long new_rate = 0, prev_rate = 0;
+        int i, freq_counter = 0;
+        int sel_freq_cnt;
+        unsigned long loc_freq_table[GP10B_MAX_SUPPORTED_FREQS];
+
+        nvgpu_mutex_acquire(&platform->clk_get_freq_lock);
+
+        if (freq_table_init_complete) {
+
+                *freqs = gp10b_freq_table;
+                *num_freqs = num_supported_freq;
+
+                nvgpu_mutex_release(&platform->clk_get_freq_lock);
+
+                return 0;
+        }
+
+        max_rate = clk_round_rate(platform->clk[0], (UINT_MAX - 1));
+
+        /*
+         * Walk the h/w frequency table and update the local table
+         */
+        for (i = 0; i < GP10B_MAX_SUPPORTED_FREQS; ++i) {
+                prev_rate = new_rate;
+                new_rate = clk_round_rate(platform->clk[0],
+                                                prev_rate + 1);
+                loc_freq_table[i] = new_rate;
+                if (new_rate == max_rate)
+                        break;
+        }
+        freq_counter = i + 1;
+        WARN_ON(freq_counter == GP10B_MAX_SUPPORTED_FREQS);
+
+        /*
+         * If the number of achievable frequencies is less than or
+         * equal to GP10B_NUM_SUPPORTED_FREQS, select all frequencies
+         * else, select one out of every 8 frequencies
+         */
+        if (freq_counter <= GP10B_NUM_SUPPORTED_FREQS) {
+                for (sel_freq_cnt = 0; sel_freq_cnt < freq_counter; ++sel_freq_cnt)
+                        gp10b_freq_table[sel_freq_cnt] =
+                                        loc_freq_table[sel_freq_cnt];
+        } else {
+                /*
+                 * Walk the h/w frequency table and only select
+                 * GP10B_FREQ_SELECT_STEP'th frequencies and
+                 * add MAX freq to last
+                 */
+                sel_freq_cnt = 0;
+                for (i = 0; i < GP10B_MAX_SUPPORTED_FREQS; ++i) {
+                        new_rate = loc_freq_table[i];
+
+                        if (i % GP10B_FREQ_SELECT_STEP == 0 ||
+                                        new_rate == max_rate) {
+                                gp10b_freq_table[sel_freq_cnt++] =
+                                                        new_rate;
+
+                                if (new_rate == max_rate)
+                                        break;
+                        }
+                }
+                WARN_ON(sel_freq_cnt == GP10B_MAX_SUPPORTED_FREQS);
+        }
+
+        /* Fill freq table */
+        *freqs = gp10b_freq_table;
+        *num_freqs = sel_freq_cnt;
+        num_supported_freq = sel_freq_cnt;
+
+        freq_table_init_complete = true;
+
+        nvgpu_log_info(g, "min rate: %ld max rate: %ld num_of_freq %d\n",
+                                gp10b_freq_table[0], max_rate, *num_freqs);
+
+        nvgpu_mutex_release(&platform->clk_get_freq_lock);
+
+        return 0;
+}
+
+struct gk20a_platform gp10b_tegra_platform = {
+        .has_syncpoints = true,
+
+        /* power management configuration */
+        .railgate_delay_init    = 500,
+
+        /* ldiv slowdown factor */
+        .ldiv_slowdown_factor_init = SLOWDOWN_FACTOR_FPDIV_BY16,
+
+        /* power management configuration */
+        .can_railgate_init      = true,
+        .enable_elpg            = true,
+        .can_elpg_init          = true,
+        .enable_blcg            = true,
+        .enable_slcg            = true,
+        .enable_elcg            = true,
+        .can_slcg               = true,
+        .can_blcg               = true,
+        .can_elcg               = true,
+        .enable_aelpg       = true,
+        .enable_perfmon         = true,
+
+        /* ptimer src frequency in hz*/
+        .ptimer_src_freq        = 31250000,
+
+        .ch_wdt_timeout_ms = 5000,
+
+        .probe = gp10b_tegra_probe,
+        .late_probe = gp10b_tegra_late_probe,
+        .remove = gp10b_tegra_remove,
+
+        /* power management callbacks */
+        .suspend = gp10b_tegra_suspend,
+        .railgate = gp10b_tegra_railgate,
+        .unrailgate = gp10b_tegra_unrailgate,
+        .is_railgated = gp10b_tegra_is_railgated,
+
+        .busy = gk20a_tegra_busy,
+        .idle = gk20a_tegra_idle,
+
+        .dump_platform_dependencies = gk20a_tegra_debug_dump,
+
+#ifdef CONFIG_NVGPU_SUPPORT_CDE
+        .has_cde = true,
+#endif
+
+        .clk_round_rate = gp10b_round_clk_rate,
+        .get_clk_freqs = gp10b_clk_get_freqs,
+
+        /* frequency scaling configuration */
+        .initscale = gp10b_tegra_scale_init,
+        .prescale = gp10b_tegra_prescale,
+        .postscale = gp10b_tegra_postscale,
+        .devfreq_governor = "nvhost_podgov",
+
+        .qos_notify = gk20a_scale_qos_notify,
+
+        .reset_assert = gp10b_tegra_reset_assert,
+        .reset_deassert = gp10b_tegra_reset_deassert,
+
+        .force_reset_in_do_idle = false,
+
+        .soc_name = "tegra18x",
+
+        .unified_memory = true,
+        .dma_mask = DMA_BIT_MASK(36),
+
+        .ltc_streamid = TEGRA_SID_GPUB,
+
+        .secure_buffer_size = 401408,
+};
diff --git a/include/os/linux/platform_gp10b_tegra.h b/include/os/linux/platform_gp10b_tegra.h
new file mode 100644
index 0000000..85b46b9
--- /dev/null
+++ b/include/os/linux/platform_gp10b_tegra.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _PLATFORM_GP10B_TEGRA_H_
+#define _PLATFORM_GP10B_TEGRA_H_
+
+#include "gp10b/gr_gp10b.h"
+
+#endif
diff --git a/include/os/linux/platform_gv11b_tegra.c b/include/os/linux/platform_gv11b_tegra.c
new file mode 100644
index 0000000..6c9d0f5
--- /dev/null
+++ b/include/os/linux/platform_gv11b_tegra.c
@@ -0,0 +1,331 @@
+/*
+ * GV11B Tegra Platform Interface
+ *
+ * Copyright (c) 2016-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/of_platform.h>
+#include <linux/debugfs.h>
+#include <linux/dma-buf.h>
+#include <linux/nvmap.h>
+#include <linux/reset.h>
+#include <linux/hashtable.h>
+#include <linux/clk.h>
+#include <linux/platform/tegra/emc_bwmgr.h>
+
+#include <nvgpu/gk20a.h>
+#include <nvgpu/nvhost.h>
+
+#include <uapi/linux/nvgpu.h>
+
+#include <soc/tegra/tegra_bpmp.h>
+#include <soc/tegra/tegra_powergate.h>
+
+#include "platform_gk20a.h"
+#include "clk.h"
+#include "scale.h"
+
+#include "platform_gp10b.h"
+#include "platform_gp10b_tegra.h"
+
+#include "os_linux.h"
+#include "platform_gk20a_tegra.h"
+#include "gv11b/gr_gv11b.h"
+
+#define EMC3D_GV11B_RATIO 500
+
+void gv11b_tegra_scale_init(struct device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+
+        if (!profile)
+                return;
+
+        platform->g->emc3d_ratio = EMC3D_GV11B_RATIO;
+
+        gp10b_tegra_scale_init(dev);
+}
+
+static void gv11b_tegra_scale_exit(struct device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+
+        if (profile)
+                tegra_bwmgr_unregister(
+                        (struct tegra_bwmgr_client *)profile->private_data);
+}
+
+static int gv11b_tegra_probe(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        int err;
+        bool joint_xpu_rail = false;
+        struct gk20a *g = platform->g;
+
+        err = nvgpu_nvhost_syncpt_init(platform->g);
+        if (err) {
+                if (err != -ENOSYS)
+                        return err;
+        }
+
+        err = gk20a_tegra_init_secure_alloc(platform);
+        if (err)
+                return err;
+
+        platform->disable_bigpage = !device_is_iommuable(dev);
+
+        platform->g->gr.ctx_vars.dump_ctxsw_stats_on_channel_close
+                = false;
+        platform->g->gr.ctx_vars.dump_ctxsw_stats_on_channel_close
+                = false;
+
+        platform->g->gr.ctx_vars.force_preemption_gfxp = false;
+        platform->g->gr.ctx_vars.force_preemption_cilp = false;
+
+#ifdef CONFIG_OF
+        joint_xpu_rail = of_property_read_bool(of_chosen,
+                                "nvidia,tegra-joint_xpu_rail");
+#endif
+
+        if (joint_xpu_rail) {
+                nvgpu_log_info(g, "XPU rails are joint\n");
+                platform->can_railgate_init = false;
+                __nvgpu_set_enabled(g, NVGPU_CAN_RAILGATE, false);
+        }
+
+        gp10b_tegra_get_clocks(dev);
+        nvgpu_linux_init_clk_support(platform->g);
+
+        nvgpu_mutex_init(&platform->clk_get_freq_lock);
+
+        platform->g->ops.clk.support_clk_freq_controller = true;
+
+        return 0;
+}
+
+static int gv11b_tegra_late_probe(struct device *dev)
+{
+        return 0;
+}
+
+
+static int gv11b_tegra_remove(struct device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+
+        gv11b_tegra_scale_exit(dev);
+
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        nvgpu_free_nvhost_dev(get_gk20a(dev));
+#endif
+
+        nvgpu_mutex_destroy(&platform->clk_get_freq_lock);
+
+        return 0;
+}
+
+static bool gv11b_tegra_is_railgated(struct device *dev)
+{
+        bool ret = false;
+#ifdef TEGRA194_POWER_DOMAIN_GPU
+        struct gk20a *g = get_gk20a(dev);
+
+        if (tegra_bpmp_running()) {
+                nvgpu_log(g, gpu_dbg_info, "bpmp running");
+                ret = !tegra_powergate_is_powered(TEGRA194_POWER_DOMAIN_GPU);
+
+                nvgpu_log(g, gpu_dbg_info, "railgated? %s", ret ? "yes" : "no");
+        } else {
+                nvgpu_log(g, gpu_dbg_info, "bpmp not running");
+        }
+#endif
+        return ret;
+}
+
+static int gv11b_tegra_railgate(struct device *dev)
+{
+#ifdef TEGRA194_POWER_DOMAIN_GPU
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+        struct gk20a *g = get_gk20a(dev);
+        int i;
+
+        /* remove emc frequency floor */
+        if (profile)
+                tegra_bwmgr_set_emc(
+                        (struct tegra_bwmgr_client *)profile->private_data,
+                        0, TEGRA_BWMGR_SET_EMC_FLOOR);
+
+        if (tegra_bpmp_running()) {
+                nvgpu_log(g, gpu_dbg_info, "bpmp running");
+                if (!tegra_powergate_is_powered(TEGRA194_POWER_DOMAIN_GPU)) {
+                        nvgpu_log(g, gpu_dbg_info, "powergate is not powered");
+                        return 0;
+                }
+                nvgpu_log(g, gpu_dbg_info, "clk_disable_unprepare");
+                for (i = 0; i < platform->num_clks; i++) {
+                        if (platform->clk[i])
+                                clk_disable_unprepare(platform->clk[i]);
+                }
+                nvgpu_log(g, gpu_dbg_info, "powergate_partition");
+                tegra_powergate_partition(TEGRA194_POWER_DOMAIN_GPU);
+        } else {
+                nvgpu_log(g, gpu_dbg_info, "bpmp not running");
+        }
+#endif
+        return 0;
+}
+
+static int gv11b_tegra_unrailgate(struct device *dev)
+{
+        int ret = 0;
+#ifdef TEGRA194_POWER_DOMAIN_GPU
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a *g = get_gk20a(dev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+        int i;
+
+        if (tegra_bpmp_running()) {
+                nvgpu_log(g, gpu_dbg_info, "bpmp running");
+                ret = tegra_unpowergate_partition(TEGRA194_POWER_DOMAIN_GPU);
+                if (ret) {
+                        nvgpu_log(g, gpu_dbg_info,
+                                "unpowergate partition failed");
+                        return ret;
+                }
+                nvgpu_log(g, gpu_dbg_info, "clk_prepare_enable");
+                for (i = 0; i < platform->num_clks; i++) {
+                        if (platform->clk[i])
+                                clk_prepare_enable(platform->clk[i]);
+                }
+        } else {
+                nvgpu_log(g, gpu_dbg_info, "bpmp not running");
+        }
+
+        /* to start with set emc frequency floor to max rate*/
+        if (profile)
+                tegra_bwmgr_set_emc(
+                        (struct tegra_bwmgr_client *)profile->private_data,
+                        tegra_bwmgr_get_max_emc_rate(),
+                        TEGRA_BWMGR_SET_EMC_FLOOR);
+#endif
+        return ret;
+}
+
+static int gv11b_tegra_suspend(struct device *dev)
+{
+        return 0;
+}
+
+static bool is_tpc_mask_valid(struct gk20a_platform *platform, u32 tpc_pg_mask)
+{
+        u32 i;
+        bool valid = false;
+
+        for (i = 0; i < MAX_TPC_PG_CONFIGS; i++) {
+                if (tpc_pg_mask == platform->valid_tpc_mask[i]) {
+                        valid = true;
+                        break;
+                }
+        }
+        return valid;
+}
+
+static void gv11b_tegra_set_tpc_pg_mask(struct device *dev, u32 tpc_pg_mask)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a *g = get_gk20a(dev);
+
+        if (is_tpc_mask_valid(platform, tpc_pg_mask)) {
+                g->tpc_pg_mask = tpc_pg_mask;
+        }
+
+}
+
+struct gk20a_platform gv11b_tegra_platform = {
+        .has_syncpoints = true,
+
+        /* ptimer src frequency in hz*/
+        .ptimer_src_freq        = 31250000,
+
+        .ch_wdt_timeout_ms = 5000,
+
+        .probe = gv11b_tegra_probe,
+        .late_probe = gv11b_tegra_late_probe,
+        .remove = gv11b_tegra_remove,
+        .railgate_delay_init    = 500,
+        .can_railgate_init      = true,
+
+        .can_tpc_powergate      = true,
+        .valid_tpc_mask[0]      = 0x0,
+        .valid_tpc_mask[1]      = 0x1,
+        .valid_tpc_mask[2]      = 0x2,
+        .valid_tpc_mask[3]      = 0x4,
+        .valid_tpc_mask[4]      = 0x8,
+        .valid_tpc_mask[5]      = 0x5,
+        .valid_tpc_mask[6]      = 0x6,
+        .valid_tpc_mask[7]      = 0x9,
+        .valid_tpc_mask[8]      = 0xa,
+
+        .set_tpc_pg_mask        = gv11b_tegra_set_tpc_pg_mask,
+
+        .can_slcg               = true,
+        .can_blcg               = true,
+        .can_elcg               = true,
+        .enable_slcg            = true,
+        .enable_blcg            = true,
+        .enable_elcg            = true,
+        .enable_perfmon         = true,
+
+        /* power management configuration */
+        .enable_elpg            = true,
+        .can_elpg_init          = true,
+        .enable_aelpg           = true,
+
+        /* power management callbacks */
+        .suspend = gv11b_tegra_suspend,
+        .railgate = gv11b_tegra_railgate,
+        .unrailgate = gv11b_tegra_unrailgate,
+        .is_railgated = gv11b_tegra_is_railgated,
+
+        .busy = gk20a_tegra_busy,
+        .idle = gk20a_tegra_idle,
+
+        .clk_round_rate = gp10b_round_clk_rate,
+        .get_clk_freqs = gp10b_clk_get_freqs,
+
+        /* frequency scaling configuration */
+        .initscale = gv11b_tegra_scale_init,
+        .prescale = gp10b_tegra_prescale,
+        .postscale = gp10b_tegra_postscale,
+        .devfreq_governor = "nvhost_podgov",
+
+        .qos_notify = gk20a_scale_qos_notify,
+
+        .dump_platform_dependencies = gk20a_tegra_debug_dump,
+
+        .soc_name = "tegra19x",
+
+        .honors_aperture = true,
+        .unified_memory = true,
+        .dma_mask = DMA_BIT_MASK(36),
+
+        .reset_assert = gp10b_tegra_reset_assert,
+        .reset_deassert = gp10b_tegra_reset_deassert,
+
+        .secure_buffer_size = 667648,
+};
diff --git a/include/os/linux/rwsem.c b/include/os/linux/rwsem.c
new file mode 100644
index 0000000..297ddf1
--- /dev/null
+++ b/include/os/linux/rwsem.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <nvgpu/rwsem.h>
+
+void nvgpu_rwsem_init(struct nvgpu_rwsem *rwsem)
+{
+        init_rwsem(&rwsem->rwsem);
+}
+
+void nvgpu_rwsem_up_read(struct nvgpu_rwsem *rwsem)
+{
+        up_read(&rwsem->rwsem);
+}
+
+void nvgpu_rwsem_down_read(struct nvgpu_rwsem *rwsem)
+{
+        down_read(&rwsem->rwsem);
+}
+
+void nvgpu_rwsem_up_write(struct nvgpu_rwsem *rwsem)
+{
+        up_write(&rwsem->rwsem);
+}
+
+void nvgpu_rwsem_down_write(struct nvgpu_rwsem *rwsem)
+{
+        down_write(&rwsem->rwsem);
+}
diff --git a/include/os/linux/scale.c b/include/os/linux/scale.c
new file mode 100644
index 0000000..388e168
--- /dev/null
+++ b/include/os/linux/scale.c
@@ -0,0 +1,435 @@
+/*
+ * gk20a clock scaling profile
+ *
+ * Copyright (c) 2013-2020, NVIDIA Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/devfreq.h>
+#include <linux/export.h>
+#include <soc/tegra/chip-id.h>
+#include <linux/pm_qos.h>
+
+#include <governor.h>
+
+#include <nvgpu/kmem.h>
+#include <nvgpu/log.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/clk_arb.h>
+
+#include "platform_gk20a.h"
+#include "scale.h"
+#include "os_linux.h"
+
+/*
+ * gk20a_scale_qos_notify()
+ *
+ * This function is called when the minimum QoS requirement for the device
+ * has changed. The function calls postscaling callback if it is defined.
+ */
+
+#if defined(CONFIG_GK20A_PM_QOS) && defined(CONFIG_COMMON_CLK)
+int gk20a_scale_qos_notify(struct notifier_block *nb,
+                          unsigned long n, void *p)
+{
+        struct gk20a_scale_profile *profile =
+                        container_of(nb, struct gk20a_scale_profile,
+                        qos_notify_block);
+        struct gk20a *g = get_gk20a(profile->dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct devfreq *devfreq = l->devfreq;
+
+        if (!devfreq)
+                return NOTIFY_OK;
+
+        mutex_lock(&devfreq->lock);
+        /* check for pm_qos min and max frequency requirement */
+        profile->qos_min_freq =
+          (unsigned long)pm_qos_read_min_bound(PM_QOS_GPU_FREQ_BOUNDS) * 1000UL;
+        profile->qos_max_freq =
+          (unsigned long)pm_qos_read_max_bound(PM_QOS_GPU_FREQ_BOUNDS) * 1000UL;
+
+        if (profile->qos_min_freq > profile->qos_max_freq) {
+                nvgpu_err(g,
+                        "QoS: setting invalid limit, min_freq=%lu max_freq=%lu",
+                        profile->qos_min_freq, profile->qos_max_freq);
+                profile->qos_min_freq = profile->qos_max_freq;
+        }
+
+        update_devfreq(devfreq);
+        mutex_unlock(&devfreq->lock);
+
+        return NOTIFY_OK;
+}
+#elif defined(CONFIG_GK20A_PM_QOS)
+int gk20a_scale_qos_notify(struct notifier_block *nb,
+                          unsigned long n, void *p)
+{
+        struct gk20a_scale_profile *profile =
+                container_of(nb, struct gk20a_scale_profile,
+                             qos_notify_block);
+        struct gk20a_platform *platform = dev_get_drvdata(profile->dev);
+        struct gk20a *g = get_gk20a(profile->dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        unsigned long freq;
+
+        if (!platform->postscale)
+                return NOTIFY_OK;
+
+        /* get the frequency requirement. if devfreq is enabled, check if it
+         * has higher demand than qos */
+        freq = platform->clk_round_rate(profile->dev,
+                        (u32)pm_qos_read_min_bound(PM_QOS_GPU_FREQ_BOUNDS));
+        if (l->devfreq)
+                freq = max(l->devfreq->previous_freq, freq);
+
+        /* Update gpu load because we may scale the emc target
+         * if the gpu load changed. */
+        nvgpu_pmu_load_update(g);
+        platform->postscale(profile->dev, freq);
+
+        return NOTIFY_OK;
+}
+#else
+int gk20a_scale_qos_notify(struct notifier_block *nb,
+                          unsigned long n, void *p)
+{
+        return 0;
+}
+#endif
+
+/*
+ * gk20a_scale_make_freq_table(profile)
+ *
+ * This function initialises the frequency table for the given device profile
+ */
+
+static int gk20a_scale_make_freq_table(struct gk20a_scale_profile *profile)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(profile->dev);
+        int num_freqs, err;
+        unsigned long *freqs;
+
+        if (platform->get_clk_freqs) {
+                /* get gpu frequency table */
+                err = platform->get_clk_freqs(profile->dev, &freqs,
+                                        &num_freqs);
+
+                if (err)
+                        return -ENOSYS;
+        } else
+                return -ENOSYS;
+
+        profile->devfreq_profile.freq_table = (unsigned long *)freqs;
+        profile->devfreq_profile.max_state = num_freqs;
+
+        return 0;
+}
+
+/*
+ * gk20a_scale_target(dev, *freq, flags)
+ *
+ * This function scales the clock
+ */
+
+static int gk20a_scale_target(struct device *dev, unsigned long *freq,
+                              u32 flags)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        struct gk20a *g = platform->g;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct gk20a_scale_profile *profile = g->scale_profile;
+        struct devfreq *devfreq = l->devfreq;
+        unsigned long local_freq = *freq;
+        unsigned long rounded_rate;
+        unsigned long min_freq = 0, max_freq = 0;
+
+        if (nvgpu_clk_arb_has_active_req(g))
+                return 0;
+        /*
+         * Calculate floor and cap frequency values
+         *
+         * Policy :
+         * We have two APIs to clip the frequency
+         *  1. devfreq
+         *  2. pm_qos
+         *
+         * To calculate floor (min) freq, we select MAX of floor frequencies
+         * requested from both APIs
+         * To get cap (max) freq, we select MIN of max frequencies
+         *
+         * In case we have conflict (min_freq > max_freq) after above
+         * steps, we ensure that max_freq wins over min_freq
+         */
+        min_freq = max_t(u32, devfreq->min_freq, profile->qos_min_freq);
+        max_freq = min_t(u32, devfreq->max_freq, profile->qos_max_freq);
+
+        if (min_freq > max_freq)
+                min_freq = max_freq;
+
+        /* Clip requested frequency */
+        if (local_freq < min_freq)
+                local_freq = min_freq;
+
+        if (local_freq > max_freq)
+                local_freq = max_freq;
+
+        /* set the final frequency */
+        rounded_rate = platform->clk_round_rate(dev, local_freq);
+
+        /* Check for duplicate request */
+        if (rounded_rate == g->last_freq)
+                return 0;
+
+        if (g->ops.clk.get_rate(g, CTRL_CLK_DOMAIN_GPCCLK) == rounded_rate)
+                *freq = rounded_rate;
+        else {
+                g->ops.clk.set_rate(g, CTRL_CLK_DOMAIN_GPCCLK, rounded_rate);
+                *freq = g->ops.clk.get_rate(g, CTRL_CLK_DOMAIN_GPCCLK);
+        }
+
+        g->last_freq = *freq;
+
+        /* postscale will only scale emc (dram clock) if evaluating
+         * gk20a_tegra_get_emc_rate() produces a new or different emc
+         * target because the load or_and gpufreq has changed */
+        if (platform->postscale)
+                platform->postscale(dev, rounded_rate);
+
+        return 0;
+}
+
+/*
+ * update_load_estimate_busy_cycles(dev)
+ *
+ * Update load estimate using pmu idle counters. Result is normalised
+ * based on the time it was asked last time.
+ */
+
+static void update_load_estimate_busy_cycles(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gk20a_scale_profile *profile = g->scale_profile;
+        unsigned long dt;
+        u32 busy_cycles_norm;
+        ktime_t t;
+
+        t = ktime_get();
+        dt = ktime_us_delta(t, profile->last_event_time);
+
+        profile->dev_stat.total_time = dt;
+        profile->last_event_time = t;
+        nvgpu_pmu_busy_cycles_norm(g, &busy_cycles_norm);
+        profile->dev_stat.busy_time =
+                (busy_cycles_norm * dt) / PMU_BUSY_CYCLES_NORM_MAX;
+}
+
+/*
+ * gk20a_scale_suspend(dev)
+ *
+ * This function informs devfreq of suspend
+ */
+
+void gk20a_scale_suspend(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct devfreq *devfreq = l->devfreq;
+
+        if (!devfreq)
+                return;
+
+        devfreq_suspend_device(devfreq);
+}
+
+/*
+ * gk20a_scale_resume(dev)
+ *
+ * This functions informs devfreq of resume
+ */
+
+void gk20a_scale_resume(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct devfreq *devfreq = l->devfreq;
+
+        if (!devfreq)
+                return;
+
+        g->last_freq = 0;
+        devfreq_resume_device(devfreq);
+}
+
+/*
+ * gk20a_scale_get_dev_status(dev, *stat)
+ *
+ * This function queries the current device status.
+ */
+
+static int gk20a_scale_get_dev_status(struct device *dev,
+                                      struct devfreq_dev_status *stat)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gk20a_scale_profile *profile = g->scale_profile;
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+
+        /* inform edp about new constraint */
+        if (platform->prescale)
+                platform->prescale(dev);
+
+        /* Make sure there are correct values for the current frequency */
+        profile->dev_stat.current_frequency =
+                                g->ops.clk.get_rate(g, CTRL_CLK_DOMAIN_GPCCLK);
+
+        /* Update load estimate */
+        update_load_estimate_busy_cycles(dev);
+
+        /* Copy the contents of the current device status */
+        *stat = profile->dev_stat;
+
+        /* Finally, clear out the local values */
+        profile->dev_stat.total_time = 0;
+        profile->dev_stat.busy_time = 0;
+
+        return 0;
+}
+
+/*
+ * get_cur_freq(struct device *dev, unsigned long *freq)
+ *
+ * This function gets the current GPU clock rate.
+ */
+
+static int get_cur_freq(struct device *dev, unsigned long *freq)
+{
+        struct gk20a *g = get_gk20a(dev);
+        *freq = g->ops.clk.get_rate(g, CTRL_CLK_DOMAIN_GPCCLK);
+        return 0;
+}
+
+
+/*
+ * gk20a_scale_init(dev)
+ */
+
+void gk20a_scale_init(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        struct gk20a *g = platform->g;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct gk20a_scale_profile *profile;
+        int err;
+
+        if (g->scale_profile)
+                return;
+
+        if (!platform->devfreq_governor && !platform->qos_notify)
+                return;
+
+        profile = nvgpu_kzalloc(g, sizeof(*profile));
+        if (!profile)
+                return;
+
+        profile->dev = dev;
+        profile->dev_stat.busy = false;
+
+        /* Create frequency table */
+        err = gk20a_scale_make_freq_table(profile);
+        if (err || !profile->devfreq_profile.max_state)
+                goto err_get_freqs;
+
+        profile->qos_min_freq = 0;
+        profile->qos_max_freq = UINT_MAX;
+
+        /* Store device profile so we can access it if devfreq governor
+         * init needs that */
+        g->scale_profile = profile;
+
+        if (platform->devfreq_governor) {
+                struct devfreq *devfreq;
+
+                profile->devfreq_profile.initial_freq =
+                        profile->devfreq_profile.freq_table[0];
+                profile->devfreq_profile.target = gk20a_scale_target;
+                profile->devfreq_profile.get_dev_status =
+                        gk20a_scale_get_dev_status;
+                profile->devfreq_profile.get_cur_freq = get_cur_freq;
+                profile->devfreq_profile.polling_ms = 25;
+
+                devfreq = devm_devfreq_add_device(dev,
+                                        &profile->devfreq_profile,
+                                        platform->devfreq_governor, NULL);
+
+                if (IS_ERR_OR_NULL(devfreq))
+                        devfreq = NULL;
+
+                l->devfreq = devfreq;
+        }
+
+#ifdef CONFIG_GK20A_PM_QOS
+        /* Should we register QoS callback for this device? */
+        if (platform->qos_notify) {
+                profile->qos_notify_block.notifier_call =
+                                        platform->qos_notify;
+
+                pm_qos_add_min_notifier(PM_QOS_GPU_FREQ_BOUNDS,
+                                        &profile->qos_notify_block);
+                pm_qos_add_max_notifier(PM_QOS_GPU_FREQ_BOUNDS,
+                                        &profile->qos_notify_block);
+        }
+#endif
+
+        return;
+
+err_get_freqs:
+        nvgpu_kfree(g, profile);
+}
+
+void gk20a_scale_exit(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        struct gk20a *g = platform->g;
+
+#ifdef CONFIG_GK20A_PM_QOS
+        if (platform->qos_notify) {
+                pm_qos_remove_min_notifier(PM_QOS_GPU_FREQ_BOUNDS,
+                                &g->scale_profile->qos_notify_block);
+                pm_qos_remove_max_notifier(PM_QOS_GPU_FREQ_BOUNDS,
+                                &g->scale_profile->qos_notify_block);
+        }
+#endif
+
+        nvgpu_kfree(g, g->scale_profile);
+        g->scale_profile = NULL;
+}
+
+/*
+ * gk20a_scale_hw_init(dev)
+ *
+ * Initialize hardware portion of the device
+ */
+
+void gk20a_scale_hw_init(struct device *dev)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+
+        /* make sure that scaling has bee initialised */
+        if (!profile)
+                return;
+
+        profile->dev_stat.total_time = 0;
+        profile->last_event_time = ktime_get();
+}
diff --git a/include/os/linux/scale.h b/include/os/linux/scale.h
new file mode 100644
index 0000000..c1e6fe8
--- /dev/null
+++ b/include/os/linux/scale.h
@@ -0,0 +1,66 @@
+/*
+ * gk20a clock scaling profile
+ *
+ * Copyright (c) 2013-2016, NVIDIA Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GK20A_SCALE_H
+#define GK20A_SCALE_H
+
+#include <linux/devfreq.h>
+
+struct clk;
+
+struct gk20a_scale_profile {
+        struct device                   *dev;
+        ktime_t                         last_event_time;
+        struct devfreq_dev_profile      devfreq_profile;
+        struct devfreq_dev_status       dev_stat;
+        struct notifier_block           qos_notify_block;
+        unsigned long                   qos_min_freq;
+        unsigned long                   qos_max_freq;
+        void                            *private_data;
+};
+
+/* Initialization and de-initialization for module */
+void gk20a_scale_init(struct device *);
+void gk20a_scale_exit(struct device *);
+void gk20a_scale_hw_init(struct device *dev);
+
+#if defined(CONFIG_GK20A_DEVFREQ)
+/*
+ * call when performing submit to notify scaling mechanism that the module is
+ * in use
+ */
+void gk20a_scale_notify_busy(struct device *);
+void gk20a_scale_notify_idle(struct device *);
+
+void gk20a_scale_suspend(struct device *);
+void gk20a_scale_resume(struct device *);
+int gk20a_scale_qos_notify(struct notifier_block *nb,
+                        unsigned long n, void *p);
+#else
+static inline void gk20a_scale_notify_busy(struct device *dev) {}
+static inline void gk20a_scale_notify_idle(struct device *dev) {}
+static inline void gk20a_scale_suspend(struct device *dev) {}
+static inline void gk20a_scale_resume(struct device *dev) {}
+static inline int gk20a_scale_qos_notify(struct notifier_block *nb,
+                        unsigned long n, void *p)
+{
+        return -ENOSYS;
+}
+#endif
+
+#endif
diff --git a/include/os/linux/sched.c b/include/os/linux/sched.c
new file mode 100644
index 0000000..30c58a1
--- /dev/null
+++ b/include/os/linux/sched.c
@@ -0,0 +1,666 @@
+/*
+ * Copyright (c) 2016-2020, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <asm/barrier.h>
+#include <linux/wait.h>
+#include <linux/uaccess.h>
+#include <linux/poll.h>
+#include <uapi/linux/nvgpu.h>
+
+#include <nvgpu/kmem.h>
+#include <nvgpu/log.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/barrier.h>
+#include <nvgpu/gk20a.h>
+
+#include "gk20a/gr_gk20a.h"
+#include "sched.h"
+#include "os_linux.h"
+#include "ioctl_tsg.h"
+
+#include <nvgpu/hw/gk20a/hw_ctxsw_prog_gk20a.h>
+#include <nvgpu/hw/gk20a/hw_gr_gk20a.h>
+
+ssize_t gk20a_sched_dev_read(struct file *filp, char __user *buf,
+        size_t size, loff_t *off)
+{
+        struct gk20a *g = filp->private_data;
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+        struct nvgpu_sched_event_arg event = { 0 };
+        int err;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched,
+                "filp=%p buf=%p size=%zu", filp, buf, size);
+
+        if (size < sizeof(event))
+                return -EINVAL;
+        size = sizeof(event);
+
+        nvgpu_mutex_acquire(&sched->status_lock);
+        while (!sched->status) {
+                nvgpu_mutex_release(&sched->status_lock);
+                if (filp->f_flags & O_NONBLOCK)
+                        return -EAGAIN;
+                err = NVGPU_COND_WAIT_INTERRUPTIBLE(&sched->readout_wq,
+                        sched->status, 0);
+                if (err)
+                        return err;
+                nvgpu_mutex_acquire(&sched->status_lock);
+        }
+
+        event.reserved = 0;
+        event.status = sched->status;
+
+        if (copy_to_user(buf, &event, size)) {
+                nvgpu_mutex_release(&sched->status_lock);
+                return -EFAULT;
+        }
+
+        sched->status = 0;
+
+        nvgpu_mutex_release(&sched->status_lock);
+
+        return size;
+}
+
+unsigned int gk20a_sched_dev_poll(struct file *filp, poll_table *wait)
+{
+        struct gk20a *g = filp->private_data;
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+        unsigned int mask = 0;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, " ");
+
+        nvgpu_mutex_acquire(&sched->status_lock);
+        poll_wait(filp, &sched->readout_wq.wq, wait);
+        if (sched->status)
+                mask |= POLLIN | POLLRDNORM;
+        nvgpu_mutex_release(&sched->status_lock);
+
+        return mask;
+}
+
+static int gk20a_sched_dev_ioctl_get_tsgs(struct gk20a *g,
+        struct nvgpu_sched_get_tsgs_args *arg)
+{
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "size=%u buffer=%llx",
+                        arg->size, arg->buffer);
+
+        if ((arg->size < sched->bitmap_size) || (!arg->buffer)) {
+                arg->size = sched->bitmap_size;
+                return -ENOSPC;
+        }
+
+        nvgpu_mutex_acquire(&sched->status_lock);
+        if (copy_to_user((void __user *)(uintptr_t)arg->buffer,
+                sched->active_tsg_bitmap, sched->bitmap_size)) {
+                nvgpu_mutex_release(&sched->status_lock);
+                return -EFAULT;
+        }
+        nvgpu_mutex_release(&sched->status_lock);
+
+        return 0;
+}
+
+static int gk20a_sched_dev_ioctl_get_recent_tsgs(struct gk20a *g,
+        struct nvgpu_sched_get_tsgs_args *arg)
+{
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "size=%u buffer=%llx",
+                        arg->size, arg->buffer);
+
+        if ((arg->size < sched->bitmap_size) || (!arg->buffer)) {
+                arg->size = sched->bitmap_size;
+                return -ENOSPC;
+        }
+
+        nvgpu_mutex_acquire(&sched->status_lock);
+        if (copy_to_user((void __user *)(uintptr_t)arg->buffer,
+                sched->recent_tsg_bitmap, sched->bitmap_size)) {
+                nvgpu_mutex_release(&sched->status_lock);
+                return -EFAULT;
+        }
+
+        memset(sched->recent_tsg_bitmap, 0, sched->bitmap_size);
+        nvgpu_mutex_release(&sched->status_lock);
+
+        return 0;
+}
+
+static int gk20a_sched_dev_ioctl_get_tsgs_by_pid(struct gk20a *g,
+        struct nvgpu_sched_get_tsgs_by_pid_args *arg)
+{
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+        struct fifo_gk20a *f = &g->fifo;
+        struct tsg_gk20a *tsg;
+        u64 *bitmap;
+        unsigned int tsgid;
+        /* pid at user level corresponds to kernel tgid */
+        pid_t tgid = (pid_t)arg->pid;
+        int err = 0;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "pid=%d size=%u buffer=%llx",
+                        (pid_t)arg->pid, arg->size, arg->buffer);
+
+        if ((arg->size < sched->bitmap_size) || (!arg->buffer)) {
+                arg->size = sched->bitmap_size;
+                return -ENOSPC;
+        }
+
+        bitmap = nvgpu_kzalloc(g, sched->bitmap_size);
+        if (!bitmap)
+                return -ENOMEM;
+
+        nvgpu_mutex_acquire(&sched->status_lock);
+        for (tsgid = 0; tsgid < f->num_channels; tsgid++) {
+                if (NVGPU_SCHED_ISSET(tsgid, sched->active_tsg_bitmap)) {
+                        tsg = &f->tsg[tsgid];
+                        if (tsg->tgid == tgid)
+                                NVGPU_SCHED_SET(tsgid, bitmap);
+                }
+        }
+        nvgpu_mutex_release(&sched->status_lock);
+
+        if (copy_to_user((void __user *)(uintptr_t)arg->buffer,
+                bitmap, sched->bitmap_size))
+                err = -EFAULT;
+
+        nvgpu_kfree(g, bitmap);
+
+        return err;
+}
+
+static int gk20a_sched_dev_ioctl_get_params(struct gk20a *g,
+        struct nvgpu_sched_tsg_get_params_args *arg)
+{
+        struct fifo_gk20a *f = &g->fifo;
+        struct tsg_gk20a *tsg;
+        u32 tsgid = arg->tsgid;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "tsgid=%u", tsgid);
+
+        if (tsgid >= f->num_channels)
+                return -EINVAL;
+
+        nvgpu_speculation_barrier();
+
+        tsg = &f->tsg[tsgid];
+        if (!nvgpu_ref_get_unless_zero(&tsg->refcount))
+                return -ENXIO;
+
+        arg->pid = tsg->tgid;   /* kernel tgid corresponds to user pid */
+        arg->runlist_interleave = tsg->interleave_level;
+        arg->timeslice = gk20a_tsg_get_timeslice(tsg);
+
+        arg->graphics_preempt_mode =
+                tsg->gr_ctx.graphics_preempt_mode;
+        arg->compute_preempt_mode =
+                tsg->gr_ctx.compute_preempt_mode;
+
+        nvgpu_ref_put(&tsg->refcount, nvgpu_ioctl_tsg_release);
+
+        return 0;
+}
+
+static int gk20a_sched_dev_ioctl_tsg_set_timeslice(
+        struct gk20a *g,
+        struct nvgpu_sched_tsg_timeslice_args *arg)
+{
+        struct fifo_gk20a *f = &g->fifo;
+        struct tsg_gk20a *tsg;
+        u32 tsgid = arg->tsgid;
+        int err;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "tsgid=%u", tsgid);
+
+        if (tsgid >= f->num_channels)
+                return -EINVAL;
+
+        nvgpu_speculation_barrier();
+
+        tsg = &f->tsg[tsgid];
+        if (!nvgpu_ref_get_unless_zero(&tsg->refcount))
+                return -ENXIO;
+
+        err = gk20a_busy(g);
+        if (err)
+                goto done;
+
+        err = gk20a_tsg_set_timeslice(tsg, arg->timeslice);
+
+        gk20a_idle(g);
+
+done:
+        nvgpu_ref_put(&tsg->refcount, nvgpu_ioctl_tsg_release);
+
+        return err;
+}
+
+static int gk20a_sched_dev_ioctl_tsg_set_runlist_interleave(
+        struct gk20a *g,
+        struct nvgpu_sched_tsg_runlist_interleave_args *arg)
+{
+        struct fifo_gk20a *f = &g->fifo;
+        struct tsg_gk20a *tsg;
+        u32 tsgid = arg->tsgid;
+        int err;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "tsgid=%u", tsgid);
+
+        if (tsgid >= f->num_channels)
+                return -EINVAL;
+
+        nvgpu_speculation_barrier();
+
+        tsg = &f->tsg[tsgid];
+        if (!nvgpu_ref_get_unless_zero(&tsg->refcount))
+                return -ENXIO;
+
+        err = gk20a_busy(g);
+        if (err)
+                goto done;
+
+        err = gk20a_tsg_set_runlist_interleave(tsg, arg->runlist_interleave);
+
+        gk20a_idle(g);
+
+done:
+        nvgpu_ref_put(&tsg->refcount, nvgpu_ioctl_tsg_release);
+
+        return err;
+}
+
+static int gk20a_sched_dev_ioctl_lock_control(struct gk20a *g)
+{
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, " ");
+
+        nvgpu_mutex_acquire(&sched->control_lock);
+        sched->control_locked = true;
+        nvgpu_mutex_release(&sched->control_lock);
+        return 0;
+}
+
+static int gk20a_sched_dev_ioctl_unlock_control(struct gk20a *g)
+{
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, " ");
+
+        nvgpu_mutex_acquire(&sched->control_lock);
+        sched->control_locked = false;
+        nvgpu_mutex_release(&sched->control_lock);
+        return 0;
+}
+
+static int gk20a_sched_dev_ioctl_get_api_version(struct gk20a *g,
+        struct nvgpu_sched_api_version_args *args)
+{
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, " ");
+
+        args->version = NVGPU_SCHED_API_VERSION;
+        return 0;
+}
+
+static int gk20a_sched_dev_ioctl_get_tsg(struct gk20a *g,
+        struct nvgpu_sched_tsg_refcount_args *arg)
+{
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+        struct fifo_gk20a *f = &g->fifo;
+        struct tsg_gk20a *tsg;
+        u32 tsgid = arg->tsgid;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "tsgid=%u", tsgid);
+
+        if (tsgid >= f->num_channels)
+                return -EINVAL;
+
+        nvgpu_speculation_barrier();
+
+        tsg = &f->tsg[tsgid];
+        if (!nvgpu_ref_get_unless_zero(&tsg->refcount))
+                return -ENXIO;
+
+        nvgpu_mutex_acquire(&sched->status_lock);
+        if (NVGPU_SCHED_ISSET(tsgid, sched->ref_tsg_bitmap)) {
+                nvgpu_warn(g, "tsgid=%d already referenced", tsgid);
+                /* unlock status_lock as nvgpu_ioctl_tsg_release locks it */
+                nvgpu_mutex_release(&sched->status_lock);
+                nvgpu_ref_put(&tsg->refcount, nvgpu_ioctl_tsg_release);
+                return -ENXIO;
+        }
+
+        /* keep reference on TSG, will be released on
+         * NVGPU_SCHED_IOCTL_PUT_TSG ioctl, or close
+         */
+        NVGPU_SCHED_SET(tsgid, sched->ref_tsg_bitmap);
+        nvgpu_mutex_release(&sched->status_lock);
+
+        return 0;
+}
+
+static int gk20a_sched_dev_ioctl_put_tsg(struct gk20a *g,
+        struct nvgpu_sched_tsg_refcount_args *arg)
+{
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+        struct fifo_gk20a *f = &g->fifo;
+        struct tsg_gk20a *tsg;
+        u32 tsgid = arg->tsgid;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "tsgid=%u", tsgid);
+
+        if (tsgid >= f->num_channels)
+                return -EINVAL;
+
+        nvgpu_speculation_barrier();
+
+        nvgpu_mutex_acquire(&sched->status_lock);
+        if (!NVGPU_SCHED_ISSET(tsgid, sched->ref_tsg_bitmap)) {
+                nvgpu_mutex_release(&sched->status_lock);
+                nvgpu_warn(g, "tsgid=%d not previously referenced", tsgid);
+                return -ENXIO;
+        }
+        NVGPU_SCHED_CLR(tsgid, sched->ref_tsg_bitmap);
+        nvgpu_mutex_release(&sched->status_lock);
+
+        tsg = &f->tsg[tsgid];
+        nvgpu_ref_put(&tsg->refcount, nvgpu_ioctl_tsg_release);
+
+        return 0;
+}
+
+int gk20a_sched_dev_open(struct inode *inode, struct file *filp)
+{
+        struct nvgpu_os_linux *l = container_of(inode->i_cdev,
+                                struct nvgpu_os_linux, sched.cdev);
+        struct gk20a *g;
+        struct nvgpu_sched_ctrl *sched;
+        int err = 0;
+
+        g = gk20a_get(&l->g);
+        if (!g)
+                return -ENODEV;
+        sched = &g->sched_ctrl;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "g=%p", g);
+
+        if (!sched->sw_ready) {
+                err = gk20a_busy(g);
+                if (err)
+                        goto free_ref;
+
+                gk20a_idle(g);
+        }
+
+        if (!nvgpu_mutex_tryacquire(&sched->busy_lock)) {
+                err = -EBUSY;
+                goto free_ref;
+        }
+
+        memcpy(sched->recent_tsg_bitmap, sched->active_tsg_bitmap,
+                        sched->bitmap_size);
+        memset(sched->ref_tsg_bitmap, 0, sched->bitmap_size);
+
+        filp->private_data = g;
+        nvgpu_log(g, gpu_dbg_sched, "filp=%p sched=%p", filp, sched);
+
+free_ref:
+        if (err)
+                gk20a_put(g);
+        return err;
+}
+
+long gk20a_sched_dev_ioctl(struct file *filp, unsigned int cmd,
+        unsigned long arg)
+{
+        struct gk20a *g = filp->private_data;
+        u8 buf[NVGPU_CTXSW_IOCTL_MAX_ARG_SIZE];
+        int err = 0;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "nr=%d", _IOC_NR(cmd));
+
+        if ((_IOC_TYPE(cmd) != NVGPU_SCHED_IOCTL_MAGIC) ||
+                (_IOC_NR(cmd) == 0) ||
+                (_IOC_NR(cmd) > NVGPU_SCHED_IOCTL_LAST) ||
+                (_IOC_SIZE(cmd) > NVGPU_SCHED_IOCTL_MAX_ARG_SIZE))
+                return -EINVAL;
+
+        memset(buf, 0, sizeof(buf));
+        if (_IOC_DIR(cmd) & _IOC_WRITE) {
+                if (copy_from_user(buf, (void __user *)arg, _IOC_SIZE(cmd)))
+                        return -EFAULT;
+        }
+
+        nvgpu_speculation_barrier();
+        switch (cmd) {
+        case NVGPU_SCHED_IOCTL_GET_TSGS:
+                err = gk20a_sched_dev_ioctl_get_tsgs(g,
+                        (struct nvgpu_sched_get_tsgs_args *)buf);
+                break;
+        case NVGPU_SCHED_IOCTL_GET_RECENT_TSGS:
+                err = gk20a_sched_dev_ioctl_get_recent_tsgs(g,
+                        (struct nvgpu_sched_get_tsgs_args *)buf);
+                break;
+        case NVGPU_SCHED_IOCTL_GET_TSGS_BY_PID:
+                err = gk20a_sched_dev_ioctl_get_tsgs_by_pid(g,
+                        (struct nvgpu_sched_get_tsgs_by_pid_args *)buf);
+                break;
+        case NVGPU_SCHED_IOCTL_TSG_GET_PARAMS:
+                err = gk20a_sched_dev_ioctl_get_params(g,
+                        (struct nvgpu_sched_tsg_get_params_args *)buf);
+                break;
+        case NVGPU_SCHED_IOCTL_TSG_SET_TIMESLICE:
+                err = gk20a_sched_dev_ioctl_tsg_set_timeslice(g,
+                        (struct nvgpu_sched_tsg_timeslice_args *)buf);
+                break;
+        case NVGPU_SCHED_IOCTL_TSG_SET_RUNLIST_INTERLEAVE:
+                err = gk20a_sched_dev_ioctl_tsg_set_runlist_interleave(g,
+                        (struct nvgpu_sched_tsg_runlist_interleave_args *)buf);
+                break;
+        case NVGPU_SCHED_IOCTL_LOCK_CONTROL:
+                err = gk20a_sched_dev_ioctl_lock_control(g);
+                break;
+        case NVGPU_SCHED_IOCTL_UNLOCK_CONTROL:
+                err = gk20a_sched_dev_ioctl_unlock_control(g);
+                break;
+        case NVGPU_SCHED_IOCTL_GET_API_VERSION:
+                err = gk20a_sched_dev_ioctl_get_api_version(g,
+                        (struct nvgpu_sched_api_version_args *)buf);
+                break;
+        case NVGPU_SCHED_IOCTL_GET_TSG:
+                err = gk20a_sched_dev_ioctl_get_tsg(g,
+                        (struct nvgpu_sched_tsg_refcount_args *)buf);
+                break;
+        case NVGPU_SCHED_IOCTL_PUT_TSG:
+                err = gk20a_sched_dev_ioctl_put_tsg(g,
+                        (struct nvgpu_sched_tsg_refcount_args *)buf);
+                break;
+        default:
+                nvgpu_log_info(g, "unrecognized gpu ioctl cmd: 0x%x", cmd);
+                err = -ENOTTY;
+        }
+
+        /* Some ioctls like NVGPU_SCHED_IOCTL_GET_TSGS might be called on
+         * purpose with NULL buffer and/or zero size to discover TSG bitmap
+         * size. We need to update user arguments in this case too, even
+         * if we return an error.
+         */
+        if ((!err || (err == -ENOSPC)) && (_IOC_DIR(cmd) & _IOC_READ)) {
+                if (copy_to_user((void __user *)arg, buf, _IOC_SIZE(cmd)))
+                        err = -EFAULT;
+        }
+
+        return err;
+}
+
+int gk20a_sched_dev_release(struct inode *inode, struct file *filp)
+{
+        struct gk20a *g = filp->private_data;
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+        struct fifo_gk20a *f = &g->fifo;
+        struct tsg_gk20a *tsg;
+        unsigned int tsgid;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "sched: %p", sched);
+
+        /* release any reference to TSGs */
+        for (tsgid = 0; tsgid < f->num_channels; tsgid++) {
+                if (NVGPU_SCHED_ISSET(tsgid, sched->ref_tsg_bitmap)) {
+                        tsg = &f->tsg[tsgid];
+                        nvgpu_ref_put(&tsg->refcount, nvgpu_ioctl_tsg_release);
+                }
+        }
+
+        /* unlock control */
+        nvgpu_mutex_acquire(&sched->control_lock);
+        sched->control_locked = false;
+        nvgpu_mutex_release(&sched->control_lock);
+
+        nvgpu_mutex_release(&sched->busy_lock);
+        gk20a_put(g);
+        return 0;
+}
+
+void gk20a_sched_ctrl_tsg_added(struct gk20a *g, struct tsg_gk20a *tsg)
+{
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+        int err;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "tsgid=%u", tsg->tsgid);
+
+        if (!sched->sw_ready) {
+                err = gk20a_busy(g);
+                if (err) {
+                        WARN_ON(err);
+                        return;
+                }
+
+                gk20a_idle(g);
+        }
+
+        nvgpu_mutex_acquire(&sched->status_lock);
+        NVGPU_SCHED_SET(tsg->tsgid, sched->active_tsg_bitmap);
+        NVGPU_SCHED_SET(tsg->tsgid, sched->recent_tsg_bitmap);
+        sched->status |= NVGPU_SCHED_STATUS_TSG_OPEN;
+        nvgpu_mutex_release(&sched->status_lock);
+        nvgpu_cond_signal_interruptible(&sched->readout_wq);
+}
+
+void gk20a_sched_ctrl_tsg_removed(struct gk20a *g, struct tsg_gk20a *tsg)
+{
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "tsgid=%u", tsg->tsgid);
+
+        nvgpu_mutex_acquire(&sched->status_lock);
+        NVGPU_SCHED_CLR(tsg->tsgid, sched->active_tsg_bitmap);
+
+        /* clear recent_tsg_bitmap as well: if app manager did not
+         * notice that TSG was previously added, no need to notify it
+         * if the TSG has been released in the meantime. If the
+         * TSG gets reallocated, app manager will be notified as usual.
+         */
+        NVGPU_SCHED_CLR(tsg->tsgid, sched->recent_tsg_bitmap);
+
+        /* do not set event_pending, we only want to notify app manager
+         * when TSGs are added, so that it can apply sched params
+         */
+        nvgpu_mutex_release(&sched->status_lock);
+}
+
+int gk20a_sched_ctrl_init(struct gk20a *g)
+{
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+        struct fifo_gk20a *f = &g->fifo;
+        int err;
+
+        if (sched->sw_ready)
+                return 0;
+
+        sched->bitmap_size = roundup(f->num_channels, 64) / 8;
+        sched->status = 0;
+
+        nvgpu_log(g, gpu_dbg_fn | gpu_dbg_sched, "g=%p sched=%p size=%zu",
+                        g, sched, sched->bitmap_size);
+
+        sched->active_tsg_bitmap = nvgpu_kzalloc(g, sched->bitmap_size);
+        if (!sched->active_tsg_bitmap)
+                return -ENOMEM;
+
+        sched->recent_tsg_bitmap = nvgpu_kzalloc(g, sched->bitmap_size);
+        if (!sched->recent_tsg_bitmap) {
+                err = -ENOMEM;
+                goto free_active;
+        }
+
+        sched->ref_tsg_bitmap = nvgpu_kzalloc(g, sched->bitmap_size);
+        if (!sched->ref_tsg_bitmap) {
+                err = -ENOMEM;
+                goto free_recent;
+        }
+
+        nvgpu_cond_init(&sched->readout_wq);
+
+        err = nvgpu_mutex_init(&sched->status_lock);
+        if (err)
+                goto free_ref;
+
+        err = nvgpu_mutex_init(&sched->control_lock);
+        if (err)
+                goto free_status_lock;
+
+        err = nvgpu_mutex_init(&sched->busy_lock);
+        if (err)
+                goto free_control_lock;
+
+        sched->sw_ready = true;
+
+        return 0;
+
+free_control_lock:
+        nvgpu_mutex_destroy(&sched->control_lock);
+free_status_lock:
+        nvgpu_mutex_destroy(&sched->status_lock);
+free_ref:
+        nvgpu_kfree(g, sched->ref_tsg_bitmap);
+free_recent:
+        nvgpu_kfree(g, sched->recent_tsg_bitmap);
+free_active:
+        nvgpu_kfree(g, sched->active_tsg_bitmap);
+
+        return err;
+}
+
+void gk20a_sched_ctrl_cleanup(struct gk20a *g)
+{
+        struct nvgpu_sched_ctrl *sched = &g->sched_ctrl;
+
+        nvgpu_kfree(g, sched->active_tsg_bitmap);
+        nvgpu_kfree(g, sched->recent_tsg_bitmap);
+        nvgpu_kfree(g, sched->ref_tsg_bitmap);
+        sched->active_tsg_bitmap = NULL;
+        sched->recent_tsg_bitmap = NULL;
+        sched->ref_tsg_bitmap = NULL;
+
+        nvgpu_mutex_destroy(&sched->status_lock);
+        nvgpu_mutex_destroy(&sched->control_lock);
+        nvgpu_mutex_destroy(&sched->busy_lock);
+
+        sched->sw_ready = false;
+}
diff --git a/include/os/linux/sched.h b/include/os/linux/sched.h
new file mode 100644
index 0000000..e88f37f
--- /dev/null
+++ b/include/os/linux/sched.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2016-2020, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __NVGPU_SCHED_H
+#define __NVGPU_SCHED_H
+
+struct gk20a;
+struct gpu_ops;
+struct tsg_gk20a;
+struct poll_table_struct;
+
+int gk20a_sched_dev_release(struct inode *inode, struct file *filp);
+int gk20a_sched_dev_open(struct inode *inode, struct file *filp);
+long gk20a_sched_dev_ioctl(struct file *, unsigned int, unsigned long);
+ssize_t gk20a_sched_dev_read(struct file *, char __user *, size_t, loff_t *);
+unsigned int gk20a_sched_dev_poll(struct file *, struct poll_table_struct *);
+
+void gk20a_sched_ctrl_tsg_added(struct gk20a *, struct tsg_gk20a *);
+void gk20a_sched_ctrl_tsg_removed(struct gk20a *, struct tsg_gk20a *);
+int gk20a_sched_ctrl_init(struct gk20a *);
+
+void gk20a_sched_ctrl_cleanup(struct gk20a *g);
+
+#endif /* __NVGPU_SCHED_H */
diff --git a/include/os/linux/sim.c b/include/os/linux/sim.c
new file mode 100644
index 0000000..792ce80
--- /dev/null
+++ b/include/os/linux/sim.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/io.h>
+#include <linux/highmem.h>
+#include <linux/platform_device.h>
+
+#include <nvgpu/log.h>
+#include <nvgpu/linux/vm.h>
+#include <nvgpu/bitops.h>
+#include <nvgpu/nvgpu_mem.h>
+#include <nvgpu/dma.h>
+#include <nvgpu/soc.h>
+#include <nvgpu/hw_sim.h>
+#include <nvgpu/sim.h>
+#include <nvgpu/gk20a.h>
+
+#include "platform_gk20a.h"
+#include "os_linux.h"
+#include "module.h"
+
+void sim_writel(struct sim_nvgpu *sim, u32 r, u32 v)
+{
+        struct sim_nvgpu_linux *sim_linux =
+                container_of(sim, struct sim_nvgpu_linux, sim);
+
+        writel(v, sim_linux->regs + r);
+}
+
+u32 sim_readl(struct sim_nvgpu *sim, u32 r)
+{
+        struct sim_nvgpu_linux *sim_linux =
+                container_of(sim, struct sim_nvgpu_linux, sim);
+
+        return readl(sim_linux->regs + r);
+}
+
+void nvgpu_remove_sim_support_linux(struct gk20a *g)
+{
+        struct sim_nvgpu_linux *sim_linux;
+
+        if (!g->sim)
+                return;
+
+        sim_linux = container_of(g->sim, struct sim_nvgpu_linux, sim);
+        if (sim_linux->regs) {
+                sim_writel(g->sim, sim_config_r(), sim_config_mode_disabled_v());
+                iounmap(sim_linux->regs);
+                sim_linux->regs = NULL;
+        }
+        nvgpu_kfree(g, sim_linux);
+        g->sim = NULL;
+}
+
+int nvgpu_init_sim_support_linux(struct gk20a *g,
+                struct platform_device *dev)
+{
+        struct sim_nvgpu_linux *sim_linux;
+        int err = -ENOMEM;
+
+        if (!nvgpu_platform_is_simulation(g))
+                return 0;
+
+        sim_linux = nvgpu_kzalloc(g, sizeof(*sim_linux));
+        if (!sim_linux)
+                return err;
+        g->sim = &sim_linux->sim;
+        g->sim->g = g;
+        sim_linux->regs = nvgpu_devm_ioremap_resource(dev,
+                                                      GK20A_SIM_IORESOURCE_MEM,
+                                                      &sim_linux->reg_mem);
+        if (IS_ERR(sim_linux->regs)) {
+                nvgpu_err(g, "failed to remap gk20a sim regs");
+                err = PTR_ERR(sim_linux->regs);
+                goto fail;
+        }
+        sim_linux->remove_support_linux = nvgpu_remove_sim_support_linux;
+        return 0;
+
+fail:
+        nvgpu_remove_sim_support_linux(g);
+        return err;
+}
diff --git a/include/os/linux/sim_pci.c b/include/os/linux/sim_pci.c
new file mode 100644
index 0000000..340f1fa
--- /dev/null
+++ b/include/os/linux/sim_pci.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/io.h>
+#include <linux/highmem.h>
+#include <linux/platform_device.h>
+
+#include <nvgpu/log.h>
+#include <nvgpu/linux/vm.h>
+#include <nvgpu/bitops.h>
+#include <nvgpu/nvgpu_mem.h>
+#include <nvgpu/dma.h>
+#include <nvgpu/hw_sim_pci.h>
+#include <nvgpu/sim.h>
+#include <nvgpu/io.h>
+#include <nvgpu/gk20a.h>
+
+#include "os_linux.h"
+#include "module.h"
+
+static bool _nvgpu_pci_is_simulation(struct gk20a *g, u32 sim_base)
+{
+        u32 cfg;
+        bool is_simulation = false;
+
+        cfg = nvgpu_readl(g, sim_base + sim_config_r());
+        if (sim_config_mode_v(cfg) == sim_config_mode_enabled_v())
+                is_simulation = true;
+
+        return is_simulation;
+}
+
+void nvgpu_remove_sim_support_linux_pci(struct gk20a *g)
+{
+        struct sim_nvgpu_linux *sim_linux;
+        bool is_simulation;
+
+        is_simulation = _nvgpu_pci_is_simulation(g, sim_r());
+
+        if (!is_simulation) {
+                return;
+        }
+
+        if (!g->sim) {
+                nvgpu_warn(g, "sim_gk20a not allocated");
+                return;
+        }
+        sim_linux = container_of(g->sim, struct sim_nvgpu_linux, sim);
+
+        if (sim_linux->regs) {
+                sim_writel(g->sim, sim_config_r(), sim_config_mode_disabled_v());
+                sim_linux->regs = NULL;
+        }
+        nvgpu_kfree(g, sim_linux);
+        g->sim = NULL;
+}
+
+int nvgpu_init_sim_support_linux_pci(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct sim_nvgpu_linux *sim_linux;
+        int err = -ENOMEM;
+        bool is_simulation;
+
+        is_simulation = _nvgpu_pci_is_simulation(g, sim_r());
+        __nvgpu_set_enabled(g, NVGPU_IS_FMODEL, is_simulation);
+
+        if (!is_simulation)
+                return 0;
+
+        sim_linux = nvgpu_kzalloc(g, sizeof(*sim_linux));
+        if (!sim_linux)
+                return err;
+        g->sim = &sim_linux->sim;
+        g->sim->g = g;
+        sim_linux->regs = l->regs + sim_r();
+        sim_linux->remove_support_linux = nvgpu_remove_sim_support_linux_pci;
+
+        return 0;
+}
diff --git a/include/os/linux/soc.c b/include/os/linux/soc.c
new file mode 100644
index 0000000..1b27d6f
--- /dev/null
+++ b/include/os/linux/soc.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <soc/tegra/chip-id.h>
+#include <soc/tegra/fuse.h>
+#include <soc/tegra/tegra_bpmp.h>
+#ifdef CONFIG_TEGRA_HV_MANAGER
+#include <soc/tegra/virt/syscalls.h>
+#endif
+
+#include <nvgpu/soc.h>
+#include "os_linux.h"
+#include "platform_gk20a.h"
+
+bool nvgpu_platform_is_silicon(struct gk20a *g)
+{
+        return tegra_platform_is_silicon();
+}
+
+bool nvgpu_platform_is_simulation(struct gk20a *g)
+{
+        return tegra_platform_is_vdk();
+}
+
+bool nvgpu_platform_is_fpga(struct gk20a *g)
+{
+        return tegra_platform_is_fpga();
+}
+
+bool nvgpu_is_hypervisor_mode(struct gk20a *g)
+{
+        return is_tegra_hypervisor_mode();
+}
+
+bool nvgpu_is_bpmp_running(struct gk20a *g)
+{
+        return tegra_bpmp_running();
+}
+
+bool nvgpu_is_soc_t194_a01(struct gk20a *g)
+{
+        return ((tegra_get_chip_id() == TEGRA194 &&
+                        tegra_chip_get_revision() == TEGRA194_REVISION_A01) ?
+                true : false);
+}
+
+#ifdef CONFIG_TEGRA_HV_MANAGER
+/* When nvlink is enabled on dGPU, we need to use physical memory addresses.
+ * There is no SMMU translation. However, the device initially enumerates as a
+ * PCIe device. As such, when allocation memory for this PCIe device, the DMA
+ * framework ends up allocating memory using SMMU (if enabled in device tree).
+ * As a result, when we switch to nvlink, we need to use underlying physical
+ * addresses, even if memory mappings exist in SMMU.
+ * In addition, when stage-2 SMMU translation is enabled (for instance when HV
+ * is enabled), the addresses we get from dma_alloc are IPAs. We need to
+ * convert them to PA.
+ */
+static u64 nvgpu_tegra_hv_ipa_pa(struct gk20a *g, u64 ipa)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct hyp_ipa_pa_info info;
+        int err;
+        u64 pa = 0ULL;
+
+        err = hyp_read_ipa_pa_info(&info, platform->vmid, ipa);
+        if (err < 0) {
+                /* WAR for bug 2096877
+                 * hyp_read_ipa_pa_info only looks up RAM mappings.
+                 * assume one to one IPA:PA mapping for syncpt aperture
+                 */
+                u64 start = g->syncpt_unit_base;
+                u64 end = g->syncpt_unit_base + g->syncpt_unit_size;
+                if ((ipa >= start) && (ipa < end)) {
+                        pa = ipa;
+                        nvgpu_log(g, gpu_dbg_map_v,
+                                "ipa=%llx vmid=%d -> pa=%llx (SYNCPT)\n",
+                                ipa, platform->vmid, pa);
+                } else {
+                        nvgpu_err(g, "ipa=%llx translation failed vmid=%u err=%d",
+                                ipa, platform->vmid, err);
+                }
+        } else {
+                pa = info.base + info.offset;
+                nvgpu_log(g, gpu_dbg_map_v,
+                                "ipa=%llx vmid=%d -> pa=%llx "
+                                "base=%llx offset=%llx size=%llx\n",
+                                ipa, platform->vmid, pa, info.base,
+                                info.offset, info.size);
+        }
+        return pa;
+}
+#endif
+
+int nvgpu_init_soc_vars(struct gk20a *g)
+{
+#ifdef CONFIG_TEGRA_HV_MANAGER
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        int err;
+
+        if (nvgpu_is_hypervisor_mode(g)) {
+                err = hyp_read_gid(&platform->vmid);
+                if (err) {
+                        nvgpu_err(g, "failed to read vmid");
+                        return err;
+                }
+                platform->phys_addr = nvgpu_tegra_hv_ipa_pa;
+        }
+#endif
+        return 0;
+}
diff --git a/include/os/linux/sync_sema_android.c b/include/os/linux/sync_sema_android.c
new file mode 100644
index 0000000..59e3b7a
--- /dev/null
+++ b/include/os/linux/sync_sema_android.c
@@ -0,0 +1,418 @@
+/*
+ * Semaphore Sync Framework Integration
+ *
+ * Copyright (c) 2017-2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/hrtimer.h>
+#include <linux/module.h>
+#include <nvgpu/lock.h>
+
+#include <nvgpu/kmem.h>
+#include <nvgpu/semaphore.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/kref.h>
+#include <nvgpu/channel.h>
+#include "../linux/channel.h"
+
+#include "../drivers/staging/android/sync.h"
+
+#include "sync_sema_android.h"
+
+static const struct sync_timeline_ops gk20a_sync_timeline_ops;
+
+struct gk20a_sync_timeline {
+        struct sync_timeline            obj;
+        u32                             max;
+        u32                             min;
+};
+
+/**
+ * The sync framework dups pts when merging fences. We share a single
+ * refcounted gk20a_sync_pt for each duped pt.
+ */
+struct gk20a_sync_pt {
+        struct gk20a                    *g;
+        struct nvgpu_ref                        refcount;
+        u32                             thresh;
+        struct nvgpu_semaphore          *sema;
+        struct gk20a_sync_timeline      *obj;
+
+        /*
+         * Use a spin lock here since it will have better performance
+         * than a mutex - there should be very little contention on this
+         * lock.
+         */
+        struct nvgpu_spinlock                   lock;
+};
+
+struct gk20a_sync_pt_inst {
+        struct sync_pt                  pt;
+        struct gk20a_sync_pt            *shared;
+};
+
+/**
+ * Compares sync pt values a and b, both of which will trigger either before
+ * or after ref (i.e. a and b trigger before ref, or a and b trigger after
+ * ref). Supplying ref allows us to handle wrapping correctly.
+ *
+ * Returns -1 if a < b (a triggers before b)
+ *          0 if a = b (a and b trigger at the same time)
+ *          1 if a > b (b triggers before a)
+ */
+static int __gk20a_sync_pt_compare_ref(
+        u32 ref,
+        u32 a,
+        u32 b)
+{
+        /*
+         * We normalize both a and b by subtracting ref from them.
+         * Denote the normalized values by a_n and b_n. Note that because
+         * of wrapping, a_n and/or b_n may be negative.
+         *
+         * The normalized values a_n and b_n satisfy:
+         * - a positive value triggers before a negative value
+         * - a smaller positive value triggers before a greater positive value
+         * - a smaller negative value (greater in absolute value) triggers
+         *   before a greater negative value (smaller in absolute value).
+         *
+         * Thus we can just stick to unsigned arithmetic and compare
+         * (u32)a_n to (u32)b_n.
+         *
+         * Just to reiterate the possible cases:
+         *
+         *      1A) ...ref..a....b....
+         *      1B) ...ref..b....a....
+         *      2A) ...b....ref..a....              b_n < 0
+         *      2B) ...a....ref..b....     a_n > 0
+         *      3A) ...a....b....ref..     a_n < 0, b_n < 0
+         *      3A) ...b....a....ref..     a_n < 0, b_n < 0
+         */
+        u32 a_n = a - ref;
+        u32 b_n = b - ref;
+        if (a_n < b_n)
+                return -1;
+        else if (a_n > b_n)
+                return 1;
+        else
+                return 0;
+}
+
+static struct gk20a_sync_pt *to_gk20a_sync_pt(struct sync_pt *pt)
+{
+        struct gk20a_sync_pt_inst *pti =
+                        container_of(pt, struct gk20a_sync_pt_inst, pt);
+        return pti->shared;
+}
+static struct gk20a_sync_timeline *to_gk20a_timeline(struct sync_timeline *obj)
+{
+        if (WARN_ON(obj->ops != &gk20a_sync_timeline_ops))
+                return NULL;
+        return (struct gk20a_sync_timeline *)obj;
+}
+
+static void gk20a_sync_pt_free_shared(struct nvgpu_ref *ref)
+{
+        struct gk20a_sync_pt *pt =
+                container_of(ref, struct gk20a_sync_pt, refcount);
+        struct gk20a *g = pt->g;
+
+        if (pt->sema)
+                nvgpu_semaphore_put(pt->sema);
+        nvgpu_kfree(g, pt);
+}
+
+static struct gk20a_sync_pt *gk20a_sync_pt_create_shared(
+                struct gk20a *g,
+                struct gk20a_sync_timeline *obj,
+                struct nvgpu_semaphore *sema)
+{
+        struct gk20a_sync_pt *shared;
+
+        shared = nvgpu_kzalloc(g, sizeof(*shared));
+        if (!shared)
+                return NULL;
+
+        nvgpu_ref_init(&shared->refcount);
+        shared->g = g;
+        shared->obj = obj;
+        shared->sema = sema;
+        shared->thresh = ++obj->max; /* sync framework has a lock */
+
+        nvgpu_spinlock_init(&shared->lock);
+
+        nvgpu_semaphore_get(sema);
+
+        return shared;
+}
+
+static struct sync_pt *gk20a_sync_pt_create_inst(
+                struct gk20a *g,
+                struct gk20a_sync_timeline *obj,
+                struct nvgpu_semaphore *sema)
+{
+        struct gk20a_sync_pt_inst *pti;
+
+        pti = (struct gk20a_sync_pt_inst *)
+                sync_pt_create(&obj->obj, sizeof(*pti));
+        if (!pti)
+                return NULL;
+
+        pti->shared = gk20a_sync_pt_create_shared(g, obj, sema);
+        if (!pti->shared) {
+                sync_pt_free(&pti->pt);
+                return NULL;
+        }
+        return &pti->pt;
+}
+
+static void gk20a_sync_pt_free_inst(struct sync_pt *sync_pt)
+{
+        struct gk20a_sync_pt *pt = to_gk20a_sync_pt(sync_pt);
+        if (pt)
+                nvgpu_ref_put(&pt->refcount, gk20a_sync_pt_free_shared);
+}
+
+static struct sync_pt *gk20a_sync_pt_dup_inst(struct sync_pt *sync_pt)
+{
+        struct gk20a_sync_pt_inst *pti;
+        struct gk20a_sync_pt *pt = to_gk20a_sync_pt(sync_pt);
+
+        pti = (struct gk20a_sync_pt_inst *)
+                sync_pt_create(&pt->obj->obj, sizeof(*pti));
+        if (!pti)
+                return NULL;
+        pti->shared = pt;
+        nvgpu_ref_get(&pt->refcount);
+        return &pti->pt;
+}
+
+/*
+ * This function must be able to run on the same sync_pt concurrently. This
+ * requires a lock to protect access to the sync_pt's internal data structures
+ * which are modified as a side effect of calling this function.
+ */
+static int gk20a_sync_pt_has_signaled(struct sync_pt *sync_pt)
+{
+        struct gk20a_sync_pt *pt = to_gk20a_sync_pt(sync_pt);
+        struct gk20a_sync_timeline *obj = pt->obj;
+        bool signaled = true;
+
+        nvgpu_spinlock_acquire(&pt->lock);
+        if (!pt->sema)
+                goto done;
+
+        /* Acquired == not realeased yet == active == not signaled. */
+        signaled = !nvgpu_semaphore_is_acquired(pt->sema);
+
+        if (signaled) {
+                /* Update min if necessary. */
+                if (__gk20a_sync_pt_compare_ref(obj->max, pt->thresh,
+                                                obj->min) == 1)
+                        obj->min = pt->thresh;
+
+                /* Release the semaphore to the pool. */
+                nvgpu_semaphore_put(pt->sema);
+                pt->sema = NULL;
+        }
+done:
+        nvgpu_spinlock_release(&pt->lock);
+
+        return signaled;
+}
+
+static int gk20a_sync_pt_compare(struct sync_pt *a, struct sync_pt *b)
+{
+        bool a_expired;
+        bool b_expired;
+        struct gk20a_sync_pt *pt_a = to_gk20a_sync_pt(a);
+        struct gk20a_sync_pt *pt_b = to_gk20a_sync_pt(b);
+
+        if (WARN_ON(pt_a->obj != pt_b->obj))
+                return 0;
+
+        /* Early out */
+        if (a == b)
+                return 0;
+
+        a_expired = gk20a_sync_pt_has_signaled(a);
+        b_expired = gk20a_sync_pt_has_signaled(b);
+        if (a_expired && !b_expired) {
+                /* Easy, a was earlier */
+                return -1;
+        } else if (!a_expired && b_expired) {
+                /* Easy, b was earlier */
+                return 1;
+        }
+
+        /* Both a and b are expired (trigger before min) or not
+         * expired (trigger after min), so we can use min
+         * as a reference value for __gk20a_sync_pt_compare_ref.
+         */
+        return __gk20a_sync_pt_compare_ref(pt_a->obj->min,
+                        pt_a->thresh, pt_b->thresh);
+}
+
+static u32 gk20a_sync_timeline_current(struct gk20a_sync_timeline *obj)
+{
+        return obj->min;
+}
+
+static void gk20a_sync_timeline_value_str(struct sync_timeline *timeline,
+                char *str, int size)
+{
+        struct gk20a_sync_timeline *obj =
+                (struct gk20a_sync_timeline *)timeline;
+        snprintf(str, size, "%d", gk20a_sync_timeline_current(obj));
+}
+
+static void gk20a_sync_pt_value_str_for_sema(struct gk20a_sync_pt *pt,
+                                             char *str, int size)
+{
+        struct nvgpu_semaphore *s = pt->sema;
+
+        snprintf(str, size, "S: pool=%llu [v=%u,r_v=%u]",
+                 s->location.pool->page_idx,
+                 nvgpu_semaphore_get_value(s),
+                 nvgpu_semaphore_read(s));
+}
+
+static void gk20a_sync_pt_value_str(struct sync_pt *sync_pt, char *str,
+                int size)
+{
+        struct gk20a_sync_pt *pt = to_gk20a_sync_pt(sync_pt);
+
+        if (pt->sema) {
+                gk20a_sync_pt_value_str_for_sema(pt, str, size);
+                return;
+        }
+
+        snprintf(str, size, "%d", pt->thresh);
+}
+
+static const struct sync_timeline_ops gk20a_sync_timeline_ops = {
+        .driver_name = "nvgpu_semaphore",
+        .dup = gk20a_sync_pt_dup_inst,
+        .has_signaled = gk20a_sync_pt_has_signaled,
+        .compare = gk20a_sync_pt_compare,
+        .free_pt = gk20a_sync_pt_free_inst,
+        .timeline_value_str = gk20a_sync_timeline_value_str,
+        .pt_value_str = gk20a_sync_pt_value_str,
+};
+
+/* Public API */
+
+struct sync_fence *gk20a_sync_fence_fdget(int fd)
+{
+        struct sync_fence *fence = sync_fence_fdget(fd);
+        int i;
+
+        if (!fence)
+                return NULL;
+
+        for (i = 0; i < fence->num_fences; i++) {
+                struct sync_pt *spt = sync_pt_from_fence(fence->cbs[i].sync_pt);
+                struct sync_timeline *t;
+
+                if (spt == NULL) {
+                        sync_fence_put(fence);
+                        return NULL;
+                }
+
+                t = sync_pt_parent(spt);
+                if (t->ops != &gk20a_sync_timeline_ops) {
+                        sync_fence_put(fence);
+                        return NULL;
+                }
+        }
+
+        return fence;
+}
+
+struct nvgpu_semaphore *gk20a_sync_pt_sema(struct sync_pt *spt)
+{
+        struct gk20a_sync_pt *pt = to_gk20a_sync_pt(spt);
+        struct nvgpu_semaphore *sema;
+
+        nvgpu_spinlock_acquire(&pt->lock);
+        sema = pt->sema;
+        if (sema)
+                nvgpu_semaphore_get(sema);
+        nvgpu_spinlock_release(&pt->lock);
+
+        return sema;
+}
+
+void gk20a_sync_timeline_signal(struct sync_timeline *timeline)
+{
+        sync_timeline_signal(timeline, 0);
+}
+
+void gk20a_sync_timeline_destroy(struct sync_timeline *timeline)
+{
+        sync_timeline_destroy(timeline);
+}
+
+struct sync_timeline *gk20a_sync_timeline_create(
+                const char *name)
+{
+        struct gk20a_sync_timeline *obj;
+
+        obj = (struct gk20a_sync_timeline *)
+                sync_timeline_create(&gk20a_sync_timeline_ops,
+                                     sizeof(struct gk20a_sync_timeline),
+                                     name);
+        if (!obj)
+                return NULL;
+        obj->max = 0;
+        obj->min = 0;
+        return &obj->obj;
+}
+
+struct sync_fence *gk20a_sync_fence_create(
+                struct channel_gk20a *c,
+                struct nvgpu_semaphore *sema,
+                const char *fmt, ...)
+{
+        char name[30];
+        va_list args;
+        struct sync_pt *pt;
+        struct sync_fence *fence;
+        struct gk20a *g = c->g;
+
+        struct nvgpu_channel_linux *os_channel_priv = c->os_priv;
+        struct nvgpu_os_fence_framework *fence_framework = NULL;
+        struct gk20a_sync_timeline *timeline = NULL;
+
+        fence_framework = &os_channel_priv->fence_framework;
+
+        timeline = to_gk20a_timeline(fence_framework->timeline);
+
+        pt = gk20a_sync_pt_create_inst(g, timeline, sema);
+        if (pt == NULL)
+                return NULL;
+
+        va_start(args, fmt);
+        vsnprintf(name, sizeof(name), fmt, args);
+        va_end(args);
+
+        fence = sync_fence_create(name, pt);
+        if (fence == NULL) {
+                sync_pt_free(pt);
+                return NULL;
+        }
+        return fence;
+}
diff --git a/include/os/linux/sync_sema_android.h b/include/os/linux/sync_sema_android.h
new file mode 100644
index 0000000..4fca7be
--- /dev/null
+++ b/include/os/linux/sync_sema_android.h
@@ -0,0 +1,51 @@
+/*
+ * Semaphore Sync Framework Integration
+ *
+ * Copyright (c) 2017-2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _GK20A_SYNC_H_
+#define _GK20A_SYNC_H_
+
+struct sync_timeline;
+struct sync_fence;
+struct sync_pt;
+struct nvgpu_semaphore;
+struct fence;
+
+#ifdef CONFIG_SYNC
+struct sync_timeline *gk20a_sync_timeline_create(const char *name);
+void gk20a_sync_timeline_destroy(struct sync_timeline *);
+void gk20a_sync_timeline_signal(struct sync_timeline *);
+struct sync_fence *gk20a_sync_fence_create(
+                struct channel_gk20a *c,
+                struct nvgpu_semaphore *,
+                const char *fmt, ...);
+struct sync_fence *gk20a_sync_fence_fdget(int fd);
+struct nvgpu_semaphore *gk20a_sync_pt_sema(struct sync_pt *spt);
+#else
+static inline void gk20a_sync_timeline_destroy(struct sync_timeline *obj) {}
+static inline void gk20a_sync_timeline_signal(struct sync_timeline *obj) {}
+static inline struct sync_fence *gk20a_sync_fence_fdget(int fd)
+{
+        return NULL;
+}
+static inline struct sync_timeline *gk20a_sync_timeline_create(
+        const char *name) {
+                return NULL;
+}
+#endif
+
+#endif
diff --git a/include/os/linux/sysfs.c b/include/os/linux/sysfs.c
new file mode 100644
index 0000000..221ea0c
--- /dev/null
+++ b/include/os/linux/sysfs.c
@@ -0,0 +1,1275 @@
+/*
+ * Copyright (c) 2011-2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/device.h>
+#include <linux/pm_runtime.h>
+#include <linux/fb.h>
+
+#include <nvgpu/kmem.h>
+#include <nvgpu/nvhost.h>
+#include <nvgpu/ptimer.h>
+#include <nvgpu/power_features/cg.h>
+#include <nvgpu/power_features/pg.h>
+
+#include "os_linux.h"
+#include "sysfs.h"
+#include "platform_gk20a.h"
+#include "gk20a/gr_gk20a.h"
+#include "gv11b/gr_gv11b.h"
+
+#define PTIMER_FP_FACTOR                        1000000
+
+#define ROOTRW (S_IRWXU|S_IRGRP|S_IROTH)
+
+#define TPC_MASK_FOR_ALL_ACTIVE_TPCs           (u32) 0x0
+
+static ssize_t elcg_enable_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val = 0;
+        int err;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        if (val) {
+                nvgpu_cg_elcg_set_elcg_enabled(g, true);
+        } else {
+                nvgpu_cg_elcg_set_elcg_enabled(g, false);
+        }
+
+        gk20a_idle(g);
+
+        nvgpu_info(g, "ELCG is %s.", val ? "enabled" :
+                        "disabled");
+
+        return count;
+}
+
+static ssize_t elcg_enable_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", g->elcg_enabled ? 1 : 0);
+}
+
+static DEVICE_ATTR(elcg_enable, ROOTRW, elcg_enable_read, elcg_enable_store);
+
+static ssize_t blcg_enable_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val = 0;
+        int err;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        if (val) {
+                nvgpu_cg_blcg_set_blcg_enabled(g, true);
+        } else {
+                nvgpu_cg_blcg_set_blcg_enabled(g, false);
+        }
+
+        gk20a_idle(g);
+
+        nvgpu_info(g, "BLCG is %s.", val ? "enabled" :
+                        "disabled");
+
+        return count;
+}
+
+static ssize_t blcg_enable_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", g->blcg_enabled ? 1 : 0);
+}
+
+
+static DEVICE_ATTR(blcg_enable, ROOTRW, blcg_enable_read, blcg_enable_store);
+
+static ssize_t slcg_enable_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val = 0;
+        int err;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        err = gk20a_busy(g);
+        if (err) {
+                return err;
+        }
+
+        if (val) {
+                nvgpu_cg_slcg_set_slcg_enabled(g, true);
+        } else {
+                nvgpu_cg_slcg_set_slcg_enabled(g, false);
+        }
+
+        /*
+         * TODO: slcg_therm_load_gating is not enabled anywhere during
+         * init. Therefore, it would be incongruous to add it here. Once
+         * it is added to init, we should add it here too.
+         */
+        gk20a_idle(g);
+
+        nvgpu_info(g, "SLCG is %s.", val ? "enabled" :
+                        "disabled");
+
+        return count;
+}
+
+static ssize_t slcg_enable_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", g->slcg_enabled ? 1 : 0);
+}
+
+static DEVICE_ATTR(slcg_enable, ROOTRW, slcg_enable_read, slcg_enable_store);
+
+static ssize_t ptimer_scale_factor_show(struct device *dev,
+                                        struct device_attribute *attr,
+                                        char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        u32 src_freq_hz = platform->ptimer_src_freq;
+        u32 scaling_factor_fp;
+        ssize_t res;
+
+        if (!src_freq_hz) {
+                nvgpu_err(g, "reference clk_m rate is not set correctly");
+                return -EINVAL;
+        }
+
+        scaling_factor_fp = (u32)(PTIMER_REF_FREQ_HZ) /
+                                ((u32)(src_freq_hz) /
+                                (u32)(PTIMER_FP_FACTOR));
+        res = snprintf(buf,
+                                PAGE_SIZE,
+                                "%u.%u\n",
+                                scaling_factor_fp / PTIMER_FP_FACTOR,
+                                scaling_factor_fp % PTIMER_FP_FACTOR);
+
+        return res;
+
+}
+
+static DEVICE_ATTR(ptimer_scale_factor,
+                        S_IRUGO,
+                        ptimer_scale_factor_show,
+                        NULL);
+
+static ssize_t ptimer_ref_freq_show(struct device *dev,
+                                        struct device_attribute *attr,
+                                        char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        u32 src_freq_hz = platform->ptimer_src_freq;
+        ssize_t res;
+
+        if (!src_freq_hz) {
+                nvgpu_err(g, "reference clk_m rate is not set correctly");
+                return -EINVAL;
+        }
+
+        res = snprintf(buf, PAGE_SIZE, "%u\n", PTIMER_REF_FREQ_HZ);
+
+        return res;
+
+}
+
+static DEVICE_ATTR(ptimer_ref_freq,
+                        S_IRUGO,
+                        ptimer_ref_freq_show,
+                        NULL);
+
+static ssize_t ptimer_src_freq_show(struct device *dev,
+                                        struct device_attribute *attr,
+                                        char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        u32 src_freq_hz = platform->ptimer_src_freq;
+        ssize_t res;
+
+        if (!src_freq_hz) {
+                nvgpu_err(g, "reference clk_m rate is not set correctly");
+                return -EINVAL;
+        }
+
+        res = snprintf(buf, PAGE_SIZE, "%u\n", src_freq_hz);
+
+        return res;
+
+}
+
+static DEVICE_ATTR(ptimer_src_freq,
+                        S_IRUGO,
+                        ptimer_src_freq_show,
+                        NULL);
+
+
+static ssize_t gpu_powered_on_show(struct device *dev,
+                                   struct device_attribute *attr,
+                                   char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", g->power_on);
+}
+
+static DEVICE_ATTR(gpu_powered_on, S_IRUGO, gpu_powered_on_show, NULL);
+
+#if defined(CONFIG_PM)
+static ssize_t railgate_enable_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        unsigned long railgate_enable = 0;
+        /* dev is guaranteed to be valid here. Ok to de-reference */
+        struct gk20a *g = get_gk20a(dev);
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        bool enabled = nvgpu_is_enabled(g, NVGPU_CAN_RAILGATE);
+        int err;
+
+        if (kstrtoul(buf, 10, &railgate_enable) < 0)
+                return -EINVAL;
+
+        /* convert to boolean */
+        railgate_enable = !!railgate_enable;
+
+        /* writing same value should be treated as nop and successful */
+        if (railgate_enable == enabled)
+                goto out;
+
+        if (!platform->can_railgate_init) {
+                nvgpu_err(g, "Railgating is not supported");
+                return -EINVAL;
+        }
+
+        if (railgate_enable) {
+                __nvgpu_set_enabled(g, NVGPU_CAN_RAILGATE, true);
+                pm_runtime_set_autosuspend_delay(dev, g->railgate_delay);
+        } else {
+                __nvgpu_set_enabled(g, NVGPU_CAN_RAILGATE, false);
+                pm_runtime_set_autosuspend_delay(dev, -1);
+        }
+        /* wake-up system to make rail-gating setting effective */
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+        gk20a_idle(g);
+
+out:
+        nvgpu_info(g, "railgate is %s.",
+                        nvgpu_is_enabled(g, NVGPU_CAN_RAILGATE) ?
+                        "enabled" : "disabled");
+
+        return count;
+}
+
+static ssize_t railgate_enable_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n",
+                        nvgpu_is_enabled(g, NVGPU_CAN_RAILGATE) ? 1 : 0);
+}
+
+static DEVICE_ATTR(railgate_enable, ROOTRW, railgate_enable_read,
+                        railgate_enable_store);
+#endif
+
+static ssize_t railgate_delay_store(struct device *dev,
+                                    struct device_attribute *attr,
+                                    const char *buf, size_t count)
+{
+        int railgate_delay = 0, ret = 0;
+        struct gk20a *g = get_gk20a(dev);
+        int err;
+
+        if (!nvgpu_is_enabled(g, NVGPU_CAN_RAILGATE)) {
+                nvgpu_info(g, "does not support power-gating");
+                return count;
+        }
+
+        ret = sscanf(buf, "%d", &railgate_delay);
+        if (ret == 1 && railgate_delay >= 0) {
+                g->railgate_delay = railgate_delay;
+                pm_runtime_set_autosuspend_delay(dev, g->railgate_delay);
+        } else
+                nvgpu_err(g, "Invalid powergate delay");
+
+        /* wake-up system to make rail-gating delay effective immediately */
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+        gk20a_idle(g);
+
+        return count;
+}
+static ssize_t railgate_delay_show(struct device *dev,
+                                   struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", g->railgate_delay);
+}
+static DEVICE_ATTR(railgate_delay, ROOTRW, railgate_delay_show,
+                   railgate_delay_store);
+
+static ssize_t is_railgated_show(struct device *dev,
+                           struct device_attribute *attr, char *buf)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        bool is_railgated = 0;
+
+        if (platform->is_railgated)
+                is_railgated = platform->is_railgated(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%s\n", is_railgated ? "yes" : "no");
+}
+static DEVICE_ATTR(is_railgated, S_IRUGO, is_railgated_show, NULL);
+
+static ssize_t counters_show(struct device *dev,
+                             struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+        u32 busy_cycles, total_cycles;
+        ssize_t res;
+
+        nvgpu_pmu_get_load_counters(g, &busy_cycles, &total_cycles);
+
+        res = snprintf(buf, PAGE_SIZE, "%u %u\n", busy_cycles, total_cycles);
+
+        return res;
+}
+static DEVICE_ATTR(counters, S_IRUGO, counters_show, NULL);
+
+static ssize_t counters_show_reset(struct device *dev,
+                                   struct device_attribute *attr, char *buf)
+{
+        ssize_t res = counters_show(dev, attr, buf);
+        struct gk20a *g = get_gk20a(dev);
+
+        nvgpu_pmu_reset_load_counters(g);
+
+        return res;
+}
+static DEVICE_ATTR(counters_reset, S_IRUGO, counters_show_reset, NULL);
+
+static ssize_t gk20a_load_show(struct device *dev,
+                                     struct device_attribute *attr,
+                                     char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+        u32 busy_time;
+        ssize_t res;
+        int err;
+
+        if (!g->power_on) {
+                busy_time = 0;
+        } else {
+                err = gk20a_busy(g);
+                if (err)
+                        return err;
+
+                nvgpu_pmu_load_update(g);
+                nvgpu_pmu_load_norm(g, &busy_time);
+                gk20a_idle(g);
+        }
+
+        res = snprintf(buf, PAGE_SIZE, "%u\n", busy_time);
+
+        return res;
+}
+static DEVICE_ATTR(load, S_IRUGO, gk20a_load_show, NULL);
+
+static ssize_t elpg_enable_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val = 0;
+        int err;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        if (!g->power_on) {
+                return -EINVAL;
+        } else {
+                err = gk20a_busy(g);
+                if (err)
+                        return -EAGAIN;
+                /*
+                 * Since elpg is refcounted, we should not unnecessarily call
+                 * enable/disable if it is already so.
+                 */
+                if (val != 0) {
+                        nvgpu_pg_elpg_set_elpg_enabled(g, true);
+                } else {
+                        nvgpu_pg_elpg_set_elpg_enabled(g, false);
+                }
+                gk20a_idle(g);
+        }
+        nvgpu_info(g, "ELPG is %s.", val ? "enabled" :
+                        "disabled");
+
+        return count;
+}
+
+static ssize_t elpg_enable_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n",
+                        nvgpu_pg_elpg_is_enabled(g) ? 1 : 0);
+}
+
+static DEVICE_ATTR(elpg_enable, ROOTRW, elpg_enable_read, elpg_enable_store);
+
+static ssize_t ldiv_slowdown_factor_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val = 0;
+        int err;
+
+        if (kstrtoul(buf, 10, &val) < 0) {
+                nvgpu_err(g, "parse error for input SLOWDOWN factor\n");
+                return -EINVAL;
+        }
+
+        if (val >= SLOWDOWN_FACTOR_FPDIV_BYMAX) {
+                nvgpu_err(g, "Invalid SLOWDOWN factor\n");
+                return -EINVAL;
+        }
+
+        if (val == g->ldiv_slowdown_factor)
+                return count;
+
+        if (!g->power_on) {
+                g->ldiv_slowdown_factor = val;
+        } else {
+                err = gk20a_busy(g);
+                if (err)
+                        return -EAGAIN;
+
+                g->ldiv_slowdown_factor = val;
+
+                if (g->ops.pmu.pmu_pg_init_param)
+                        g->ops.pmu.pmu_pg_init_param(g,
+                                PMU_PG_ELPG_ENGINE_ID_GRAPHICS);
+
+                gk20a_idle(g);
+        }
+
+        nvgpu_info(g, "ldiv_slowdown_factor is %x\n", g->ldiv_slowdown_factor);
+
+        return count;
+}
+
+static ssize_t ldiv_slowdown_factor_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", g->ldiv_slowdown_factor);
+}
+
+static DEVICE_ATTR(ldiv_slowdown_factor, ROOTRW,
+                        ldiv_slowdown_factor_read, ldiv_slowdown_factor_store);
+
+static ssize_t mscg_enable_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct nvgpu_pmu *pmu = &g->pmu;
+        unsigned long val = 0;
+        int err;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        if (!g->power_on) {
+                g->mscg_enabled = val ? true : false;
+        } else {
+                err = gk20a_busy(g);
+                if (err)
+                        return -EAGAIN;
+                /*
+                 * Since elpg is refcounted, we should not unnecessarily call
+                 * enable/disable if it is already so.
+                 */
+                if (val && !g->mscg_enabled) {
+                        g->mscg_enabled = true;
+                        if (g->ops.pmu.pmu_is_lpwr_feature_supported(g,
+                                        PMU_PG_LPWR_FEATURE_MSCG)) {
+                                if (!ACCESS_ONCE(pmu->mscg_stat)) {
+                                        WRITE_ONCE(pmu->mscg_stat,
+                                                PMU_MSCG_ENABLED);
+                                        /* make status visible */
+                                        smp_mb();
+                                }
+                        }
+
+                } else if (!val && g->mscg_enabled) {
+                        if (g->ops.pmu.pmu_is_lpwr_feature_supported(g,
+                                        PMU_PG_LPWR_FEATURE_MSCG)) {
+                                nvgpu_pmu_pg_global_enable(g, false);
+                                WRITE_ONCE(pmu->mscg_stat, PMU_MSCG_DISABLED);
+                                /* make status visible */
+                                smp_mb();
+                                g->mscg_enabled = false;
+                                if (nvgpu_pg_elpg_is_enabled(g)) {
+                                        nvgpu_pg_elpg_enable(g);
+                                }
+                        }
+                        g->mscg_enabled = false;
+                }
+                gk20a_idle(g);
+        }
+        nvgpu_info(g, "MSCG is %s.", g->mscg_enabled ? "enabled" :
+                        "disabled");
+
+        return count;
+}
+
+static ssize_t mscg_enable_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", g->mscg_enabled ? 1 : 0);
+}
+
+static DEVICE_ATTR(mscg_enable, ROOTRW, mscg_enable_read, mscg_enable_store);
+
+static ssize_t aelpg_param_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        int status = 0;
+        union pmu_ap_cmd ap_cmd;
+        int *paramlist = (int *)g->pmu.aelpg_param;
+        u32 defaultparam[5] = {
+                        APCTRL_SAMPLING_PERIOD_PG_DEFAULT_US,
+                        APCTRL_MINIMUM_IDLE_FILTER_DEFAULT_US,
+                        APCTRL_MINIMUM_TARGET_SAVING_DEFAULT_US,
+                        APCTRL_POWER_BREAKEVEN_DEFAULT_US,
+                        APCTRL_CYCLES_PER_SAMPLE_MAX_DEFAULT
+        };
+
+        /* Get each parameter value from input string*/
+        sscanf(buf, "%d %d %d %d %d", &paramlist[0], &paramlist[1],
+                                &paramlist[2], &paramlist[3], &paramlist[4]);
+
+        /* If parameter value is 0 then reset to SW default values*/
+        if ((paramlist[0] | paramlist[1] | paramlist[2]
+                | paramlist[3] | paramlist[4]) == 0x00) {
+                memcpy(paramlist, defaultparam, sizeof(defaultparam));
+        }
+
+        /* If aelpg is enabled & pmu is ready then post values to
+         * PMU else store then post later
+         */
+        if (g->aelpg_enabled && g->pmu.pmu_ready) {
+                /* Disable AELPG */
+                ap_cmd.disable_ctrl.cmd_id = PMU_AP_CMD_ID_DISABLE_CTRL;
+                ap_cmd.disable_ctrl.ctrl_id = PMU_AP_CTRL_ID_GRAPHICS;
+                status = nvgpu_pmu_ap_send_command(g, &ap_cmd, false);
+
+                /* Enable AELPG */
+                nvgpu_aelpg_init(g);
+                nvgpu_aelpg_init_and_enable(g, PMU_AP_CTRL_ID_GRAPHICS);
+        }
+
+        return count;
+}
+
+static ssize_t aelpg_param_read(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE,
+                "%d %d %d %d %d\n", g->pmu.aelpg_param[0],
+                g->pmu.aelpg_param[1], g->pmu.aelpg_param[2],
+                g->pmu.aelpg_param[3], g->pmu.aelpg_param[4]);
+}
+
+static DEVICE_ATTR(aelpg_param, ROOTRW,
+                aelpg_param_read, aelpg_param_store);
+
+static ssize_t aelpg_enable_store(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val = 0;
+        int status = 0;
+        union pmu_ap_cmd ap_cmd;
+        int err;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        if (g->pmu.pmu_ready) {
+                if (val && !g->aelpg_enabled) {
+                        g->aelpg_enabled = true;
+                        /* Enable AELPG */
+                        ap_cmd.enable_ctrl.cmd_id = PMU_AP_CMD_ID_ENABLE_CTRL;
+                        ap_cmd.enable_ctrl.ctrl_id = PMU_AP_CTRL_ID_GRAPHICS;
+                        status = nvgpu_pmu_ap_send_command(g, &ap_cmd, false);
+                } else if (!val && g->aelpg_enabled) {
+                        g->aelpg_enabled = false;
+                        /* Disable AELPG */
+                        ap_cmd.disable_ctrl.cmd_id = PMU_AP_CMD_ID_DISABLE_CTRL;
+                        ap_cmd.disable_ctrl.ctrl_id = PMU_AP_CTRL_ID_GRAPHICS;
+                        status = nvgpu_pmu_ap_send_command(g, &ap_cmd, false);
+                }
+        } else {
+                nvgpu_info(g, "PMU is not ready, AELPG request failed");
+        }
+        gk20a_idle(g);
+
+        nvgpu_info(g, "AELPG is %s.", g->aelpg_enabled ? "enabled" :
+                        "disabled");
+
+        return count;
+}
+
+static ssize_t aelpg_enable_read(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", g->aelpg_enabled ? 1 : 0);
+}
+
+static DEVICE_ATTR(aelpg_enable, ROOTRW,
+                aelpg_enable_read, aelpg_enable_store);
+
+
+static ssize_t allow_all_enable_read(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", g->allow_all ? 1 : 0);
+}
+
+static ssize_t allow_all_enable_store(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val = 0;
+        int err;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        err = gk20a_busy(g);
+        g->allow_all = (val ? true : false);
+        gk20a_idle(g);
+
+        return count;
+}
+
+static DEVICE_ATTR(allow_all, ROOTRW,
+                allow_all_enable_read, allow_all_enable_store);
+
+static ssize_t emc3d_ratio_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val = 0;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        g->emc3d_ratio = val;
+
+        return count;
+}
+
+static ssize_t emc3d_ratio_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", g->emc3d_ratio);
+}
+
+static DEVICE_ATTR(emc3d_ratio, ROOTRW, emc3d_ratio_read, emc3d_ratio_store);
+
+static ssize_t fmax_at_vmin_safe_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long gpu_fmax_at_vmin_hz = 0;
+
+        if (g->ops.clk.get_fmax_at_vmin_safe)
+                gpu_fmax_at_vmin_hz = g->ops.clk.get_fmax_at_vmin_safe(g);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", (int)(gpu_fmax_at_vmin_hz));
+}
+
+static DEVICE_ATTR(fmax_at_vmin_safe, S_IRUGO, fmax_at_vmin_safe_read, NULL);
+
+#ifdef CONFIG_PM
+static ssize_t force_idle_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val = 0;
+        int err = 0;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        if (val) {
+                if (g->forced_idle)
+                        return count; /* do nothing */
+                else {
+                        err = __gk20a_do_idle(g, false);
+                        if (!err) {
+                                g->forced_idle = 1;
+                                nvgpu_info(g, "gpu is idle : %d",
+                                        g->forced_idle);
+                        }
+                }
+        } else {
+                if (!g->forced_idle)
+                        return count; /* do nothing */
+                else {
+                        err = __gk20a_do_unidle(g);
+                        if (!err) {
+                                g->forced_idle = 0;
+                                nvgpu_info(g, "gpu is idle : %d",
+                                        g->forced_idle);
+                        }
+                }
+        }
+
+        return count;
+}
+
+static ssize_t force_idle_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", g->forced_idle ? 1 : 0);
+}
+
+static DEVICE_ATTR(force_idle, ROOTRW, force_idle_read, force_idle_store);
+#endif
+
+static bool is_tpc_mask_valid(struct gk20a *g, u32 tpc_mask)
+{
+        u32 i;
+        bool valid = false;
+
+        for (i = 0; i < MAX_TPC_PG_CONFIGS; i++) {
+                if (tpc_mask == g->valid_tpc_mask[i]) {
+                        valid = true;
+                        break;
+                }
+        }
+        return valid;
+}
+
+static ssize_t tpc_pg_mask_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", g->tpc_pg_mask);
+}
+
+static ssize_t tpc_pg_mask_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gr_gk20a *gr = &g->gr;
+        unsigned long val = 0;
+
+        nvgpu_mutex_acquire(&g->tpc_pg_lock);
+
+        if (kstrtoul(buf, 10, &val) < 0) {
+                nvgpu_err(g, "invalid value");
+                nvgpu_mutex_release(&g->tpc_pg_lock);
+                return -EINVAL;
+        }
+
+        if (val == g->tpc_pg_mask) {
+                nvgpu_info(g, "no value change, same mask already set");
+                goto exit;
+        }
+
+        if (gr->ctx_vars.golden_image_size) {
+                nvgpu_err(g, "golden image size already initialized");
+                nvgpu_mutex_release(&g->tpc_pg_lock);
+                return -ENODEV;
+        }
+
+        /* checking that the value from userspace is within
+         * the  possible valid TPC configurations.
+         */
+        if (is_tpc_mask_valid(g, (u32)val)) {
+                g->tpc_pg_mask = val;
+        } else {
+                nvgpu_err(g, "TPC-PG mask is invalid");
+                nvgpu_mutex_release(&g->tpc_pg_lock);
+                return -EINVAL;
+        }
+exit:
+        nvgpu_mutex_release(&g->tpc_pg_lock);
+
+        return count;
+}
+
+static DEVICE_ATTR(tpc_pg_mask, ROOTRW, tpc_pg_mask_read, tpc_pg_mask_store);
+
+static ssize_t tpc_fs_mask_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val = 0;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        if (!g->gr.gpc_tpc_mask)
+                return -ENODEV;
+
+        if (val && val != g->gr.gpc_tpc_mask[0] && g->ops.gr.set_gpc_tpc_mask) {
+                g->gr.gpc_tpc_mask[0] = val;
+                g->tpc_fs_mask_user = val;
+
+                g->ops.gr.set_gpc_tpc_mask(g, 0);
+
+                nvgpu_vfree(g, g->gr.ctx_vars.local_golden_image);
+                g->gr.ctx_vars.local_golden_image = NULL;
+                g->gr.ctx_vars.golden_image_initialized = false;
+                g->gr.ctx_vars.golden_image_size = 0;
+                /* Cause next poweron to reinit just gr */
+                g->gr.sw_ready = false;
+        }
+
+        return count;
+}
+
+static ssize_t tpc_fs_mask_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gr_gk20a *gr = &g->gr;
+        u32 gpc_index;
+        u32 tpc_fs_mask = 0;
+        int err = 0;
+
+        err = gk20a_busy(g);
+        if (err)
+                return err;
+
+        for (gpc_index = 0; gpc_index < gr->gpc_count; gpc_index++) {
+                if (g->ops.gr.get_gpc_tpc_mask)
+                        tpc_fs_mask |=
+                                g->ops.gr.get_gpc_tpc_mask(g, gpc_index) <<
+                                (gr->max_tpc_per_gpc_count * gpc_index);
+        }
+
+        gk20a_idle(g);
+
+        return snprintf(buf, PAGE_SIZE, "0x%x\n", tpc_fs_mask);
+}
+
+static DEVICE_ATTR(tpc_fs_mask, ROOTRW, tpc_fs_mask_read, tpc_fs_mask_store);
+
+static ssize_t min_timeslice_us_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", g->min_timeslice_us);
+}
+
+static ssize_t min_timeslice_us_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        if (val > g->max_timeslice_us)
+                return -EINVAL;
+
+        g->min_timeslice_us = val;
+
+        return count;
+}
+
+static DEVICE_ATTR(min_timeslice_us, ROOTRW, min_timeslice_us_read,
+                   min_timeslice_us_store);
+
+static ssize_t max_timeslice_us_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", g->max_timeslice_us);
+}
+
+static ssize_t max_timeslice_us_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        if (val < g->min_timeslice_us)
+                return -EINVAL;
+
+        g->max_timeslice_us = val;
+
+        return count;
+}
+
+static DEVICE_ATTR(max_timeslice_us, ROOTRW, max_timeslice_us_read,
+                   max_timeslice_us_store);
+
+static ssize_t czf_bypass_store(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        if (val >= 4)
+                return -EINVAL;
+
+        g->gr.czf_bypass = val;
+
+        return count;
+}
+
+static ssize_t czf_bypass_read(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return sprintf(buf, "%d\n", g->gr.czf_bypass);
+}
+
+static DEVICE_ATTR(czf_bypass, ROOTRW, czf_bypass_read, czf_bypass_store);
+
+static ssize_t pd_max_batches_store(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        if (val > 64)
+                return -EINVAL;
+
+        g->gr.pd_max_batches = val;
+
+        return count;
+}
+
+static ssize_t pd_max_batches_read(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return sprintf(buf, "%d\n", g->gr.pd_max_batches);
+}
+
+static DEVICE_ATTR(pd_max_batches, ROOTRW, pd_max_batches_read, pd_max_batches_store);
+
+static ssize_t gfxp_wfi_timeout_count_store(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gr_gk20a *gr = &g->gr;
+        unsigned long val = 0;
+        int err = -1;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        if (g->ops.gr.get_max_gfxp_wfi_timeout_count) {
+                if (val >= g->ops.gr.get_max_gfxp_wfi_timeout_count(g))
+                        return -EINVAL;
+        }
+
+        gr->gfxp_wfi_timeout_count = val;
+
+        if (g->ops.gr.init_preemption_state && g->power_on) {
+                err = gk20a_busy(g);
+                if (err)
+                        return err;
+
+                err = gr_gk20a_elpg_protected_call(g,
+                        g->ops.gr.init_preemption_state(g));
+
+                gk20a_idle(g);
+
+                if (err)
+                        return err;
+        }
+        return count;
+}
+
+static ssize_t gfxp_wfi_timeout_unit_store(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gr_gk20a *gr = &g->gr;
+        int err = -1;
+
+        if (count > 0 && buf[0] == 's')
+                /* sysclk */
+                gr->gfxp_wfi_timeout_unit = GFXP_WFI_TIMEOUT_UNIT_SYSCLK;
+        else
+                /* usec */
+                gr->gfxp_wfi_timeout_unit = GFXP_WFI_TIMEOUT_UNIT_USEC;
+
+        if (g->ops.gr.init_preemption_state && g->power_on) {
+                err = gk20a_busy(g);
+                if (err)
+                        return err;
+
+                err = gr_gk20a_elpg_protected_call(g,
+                        g->ops.gr.init_preemption_state(g));
+
+                gk20a_idle(g);
+
+                if (err)
+                        return err;
+        }
+
+        return count;
+}
+
+static ssize_t gfxp_wfi_timeout_count_read(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gr_gk20a *gr = &g->gr;
+        u32 val = gr->gfxp_wfi_timeout_count;
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", val);
+}
+
+static ssize_t gfxp_wfi_timeout_unit_read(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gr_gk20a *gr = &g->gr;
+
+        if (gr->gfxp_wfi_timeout_unit == GFXP_WFI_TIMEOUT_UNIT_USEC)
+                return snprintf(buf, PAGE_SIZE, "usec\n");
+        else
+                return snprintf(buf, PAGE_SIZE, "sysclk\n");
+}
+
+static DEVICE_ATTR(gfxp_wfi_timeout_count, (S_IRWXU|S_IRGRP|S_IROTH),
+                gfxp_wfi_timeout_count_read, gfxp_wfi_timeout_count_store);
+
+static DEVICE_ATTR(gfxp_wfi_timeout_unit, (S_IRWXU|S_IRGRP|S_IROTH),
+                gfxp_wfi_timeout_unit_read, gfxp_wfi_timeout_unit_store);
+
+static ssize_t comptag_mem_deduct_store(struct device *dev,
+                                        struct device_attribute *attr,
+                                        const char *buf, size_t count)
+{
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long val;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        if (val >= totalram_size_in_mb) {
+                dev_err(dev, "comptag_mem_deduct can not be set above %lu",
+                        totalram_size_in_mb);
+                return -EINVAL;
+        }
+
+        g->gr.comptag_mem_deduct = val;
+        /* Deduct the part taken by the running system */
+        g->gr.max_comptag_mem -= val;
+
+        return count;
+}
+
+static ssize_t comptag_mem_deduct_show(struct device *dev,
+                                       struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return sprintf(buf, "%d\n", g->gr.comptag_mem_deduct);
+}
+
+static DEVICE_ATTR(comptag_mem_deduct, ROOTRW,
+                   comptag_mem_deduct_show, comptag_mem_deduct_store);
+
+void nvgpu_remove_sysfs(struct device *dev)
+{
+        device_remove_file(dev, &dev_attr_elcg_enable);
+        device_remove_file(dev, &dev_attr_blcg_enable);
+        device_remove_file(dev, &dev_attr_slcg_enable);
+        device_remove_file(dev, &dev_attr_ptimer_scale_factor);
+        device_remove_file(dev, &dev_attr_ptimer_ref_freq);
+        device_remove_file(dev, &dev_attr_ptimer_src_freq);
+        device_remove_file(dev, &dev_attr_elpg_enable);
+        device_remove_file(dev, &dev_attr_mscg_enable);
+        device_remove_file(dev, &dev_attr_emc3d_ratio);
+        device_remove_file(dev, &dev_attr_ldiv_slowdown_factor);
+
+        device_remove_file(dev, &dev_attr_fmax_at_vmin_safe);
+
+        device_remove_file(dev, &dev_attr_counters);
+        device_remove_file(dev, &dev_attr_counters_reset);
+        device_remove_file(dev, &dev_attr_load);
+        device_remove_file(dev, &dev_attr_railgate_delay);
+        device_remove_file(dev, &dev_attr_is_railgated);
+#ifdef CONFIG_PM
+        device_remove_file(dev, &dev_attr_force_idle);
+        device_remove_file(dev, &dev_attr_railgate_enable);
+#endif
+        device_remove_file(dev, &dev_attr_aelpg_param);
+        device_remove_file(dev, &dev_attr_aelpg_enable);
+        device_remove_file(dev, &dev_attr_allow_all);
+        device_remove_file(dev, &dev_attr_tpc_fs_mask);
+        device_remove_file(dev, &dev_attr_tpc_pg_mask);
+        device_remove_file(dev, &dev_attr_min_timeslice_us);
+        device_remove_file(dev, &dev_attr_max_timeslice_us);
+
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        nvgpu_nvhost_remove_symlink(get_gk20a(dev));
+#endif
+
+        device_remove_file(dev, &dev_attr_czf_bypass);
+        device_remove_file(dev, &dev_attr_pd_max_batches);
+        device_remove_file(dev, &dev_attr_gfxp_wfi_timeout_count);
+        device_remove_file(dev, &dev_attr_gfxp_wfi_timeout_unit);
+        device_remove_file(dev, &dev_attr_gpu_powered_on);
+
+        device_remove_file(dev, &dev_attr_comptag_mem_deduct);
+
+        if (strcmp(dev_name(dev), "gpu.0")) {
+                struct kobject *kobj = &dev->kobj;
+                struct device *parent = container_of((kobj->parent),
+                                struct device, kobj);
+                sysfs_remove_link(&parent->kobj, "gpu.0");
+        }
+}
+
+int nvgpu_create_sysfs(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        int error = 0;
+
+        error |= device_create_file(dev, &dev_attr_elcg_enable);
+        error |= device_create_file(dev, &dev_attr_blcg_enable);
+        error |= device_create_file(dev, &dev_attr_slcg_enable);
+        error |= device_create_file(dev, &dev_attr_ptimer_scale_factor);
+        error |= device_create_file(dev, &dev_attr_ptimer_ref_freq);
+        error |= device_create_file(dev, &dev_attr_ptimer_src_freq);
+        error |= device_create_file(dev, &dev_attr_elpg_enable);
+        error |= device_create_file(dev, &dev_attr_mscg_enable);
+        error |= device_create_file(dev, &dev_attr_emc3d_ratio);
+        error |= device_create_file(dev, &dev_attr_ldiv_slowdown_factor);
+
+        error |= device_create_file(dev, &dev_attr_fmax_at_vmin_safe);
+
+        error |= device_create_file(dev, &dev_attr_counters);
+        error |= device_create_file(dev, &dev_attr_counters_reset);
+        error |= device_create_file(dev, &dev_attr_load);
+        error |= device_create_file(dev, &dev_attr_railgate_delay);
+        error |= device_create_file(dev, &dev_attr_is_railgated);
+#ifdef CONFIG_PM
+        error |= device_create_file(dev, &dev_attr_force_idle);
+        error |= device_create_file(dev, &dev_attr_railgate_enable);
+#endif
+        error |= device_create_file(dev, &dev_attr_aelpg_param);
+        error |= device_create_file(dev, &dev_attr_aelpg_enable);
+        error |= device_create_file(dev, &dev_attr_allow_all);
+        error |= device_create_file(dev, &dev_attr_tpc_fs_mask);
+        error |= device_create_file(dev, &dev_attr_tpc_pg_mask);
+        error |= device_create_file(dev, &dev_attr_min_timeslice_us);
+        error |= device_create_file(dev, &dev_attr_max_timeslice_us);
+
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        error |= nvgpu_nvhost_create_symlink(g);
+#endif
+
+        error |= device_create_file(dev, &dev_attr_czf_bypass);
+        error |= device_create_file(dev, &dev_attr_pd_max_batches);
+        error |= device_create_file(dev, &dev_attr_gfxp_wfi_timeout_count);
+        error |= device_create_file(dev, &dev_attr_gfxp_wfi_timeout_unit);
+        error |= device_create_file(dev, &dev_attr_gpu_powered_on);
+
+        error |= device_create_file(dev, &dev_attr_comptag_mem_deduct);
+
+        if (strcmp(dev_name(dev), "gpu.0")) {
+                struct kobject *kobj = &dev->kobj;
+                struct device *parent = container_of((kobj->parent),
+                                        struct device, kobj);
+                error |= sysfs_create_link(&parent->kobj,
+                                   &dev->kobj, "gpu.0");
+        }
+
+        if (error)
+                nvgpu_err(g, "Failed to create sysfs attributes!\n");
+
+        return error;
+}
diff --git a/include/os/linux/sysfs.h b/include/os/linux/sysfs.h
new file mode 100644
index 0000000..8092584
--- /dev/null
+++ b/include/os/linux/sysfs.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef NVGPU_SYSFS_H
+#define NVGPU_SYSFS_H
+
+struct device;
+
+int nvgpu_create_sysfs(struct device *dev);
+void nvgpu_remove_sysfs(struct device *dev);
+
+#endif
diff --git a/include/os/linux/thread.c b/include/os/linux/thread.c
new file mode 100644
index 0000000..c56bff6
--- /dev/null
+++ b/include/os/linux/thread.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kthread.h>
+
+#include <nvgpu/thread.h>
+#include <nvgpu/timers.h>
+
+int nvgpu_thread_proxy(void *threaddata)
+{
+        struct nvgpu_thread *thread = threaddata;
+        int ret = thread->fn(thread->data);
+
+        thread->running = false;
+        return ret;
+}
+
+int nvgpu_thread_create(struct nvgpu_thread *thread,
+                void *data,
+                int (*threadfn)(void *data), const char *name)
+{
+        struct task_struct *task = kthread_create(nvgpu_thread_proxy,
+                        thread, name);
+        if (IS_ERR(task))
+                return PTR_ERR(task);
+
+        thread->task = task;
+        thread->fn = threadfn;
+        thread->data = data;
+        thread->running = true;
+        wake_up_process(task);
+        return 0;
+};
+
+void nvgpu_thread_stop(struct nvgpu_thread *thread)
+{
+        if (thread->task) {
+                kthread_stop(thread->task);
+                thread->task = NULL;
+        }
+};
+
+bool nvgpu_thread_should_stop(struct nvgpu_thread *thread)
+{
+        return kthread_should_stop();
+};
+
+bool nvgpu_thread_is_running(struct nvgpu_thread *thread)
+{
+        return ACCESS_ONCE(thread->running);
+};
+
+void nvgpu_thread_join(struct nvgpu_thread *thread)
+{
+        while (ACCESS_ONCE(thread->running))
+                nvgpu_msleep(10);
+};
diff --git a/include/os/linux/timers.c b/include/os/linux/timers.c
new file mode 100644
index 0000000..018fd2d
--- /dev/null
+++ b/include/os/linux/timers.c
@@ -0,0 +1,269 @@
+/*
+ * Copyright (c) 2016-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/ktime.h>
+#include <linux/delay.h>
+
+#include <nvgpu/timers.h>
+#include <nvgpu/soc.h>
+#include <nvgpu/gk20a.h>
+
+#include "platform_gk20a.h"
+
+/*
+ * Returns 1 if the platform is pre-Si and should ignore the timeout checking.
+ * Setting %NVGPU_TIMER_NO_PRE_SI will make this always return 0 (i.e do the
+ * timeout check regardless of platform).
+ */
+static int nvgpu_timeout_is_pre_silicon(struct nvgpu_timeout *timeout)
+{
+        if (timeout->flags & NVGPU_TIMER_NO_PRE_SI)
+                return 0;
+
+        return !nvgpu_platform_is_silicon(timeout->g);
+}
+
+/**
+ * nvgpu_timeout_init - Init timer.
+ *
+ * @g        - nvgpu device.
+ * @timeout  - The timer.
+ * @duration - Timeout in milliseconds or number of retries.
+ * @flags    - Flags for timer.
+ *
+ * This configures the timeout to start the timeout duration now, i.e: when this
+ * function is called. Available flags to pass to @flags:
+ *
+ *   %NVGPU_TIMER_CPU_TIMER
+ *   %NVGPU_TIMER_RETRY_TIMER
+ *   %NVGPU_TIMER_NO_PRE_SI
+ *   %NVGPU_TIMER_SILENT_TIMEOUT
+ *
+ * If neither %NVGPU_TIMER_CPU_TIMER or %NVGPU_TIMER_RETRY_TIMER is passed then
+ * a CPU timer is used by default.
+ */
+int nvgpu_timeout_init(struct gk20a *g, struct nvgpu_timeout *timeout,
+                       u32 duration, unsigned long flags)
+{
+        if (flags & ~NVGPU_TIMER_FLAG_MASK)
+                return -EINVAL;
+
+        memset(timeout, 0, sizeof(*timeout));
+
+        timeout->g = g;
+        timeout->flags = flags;
+
+        if (flags & NVGPU_TIMER_RETRY_TIMER)
+                timeout->retries.max = duration;
+        else
+                timeout->time = ktime_to_ns(ktime_add_ns(ktime_get(),
+                                        (s64)NSEC_PER_MSEC * duration));
+
+        return 0;
+}
+
+static int __nvgpu_timeout_expired_msg_cpu(struct nvgpu_timeout *timeout,
+                                         void *caller,
+                                         const char *fmt, va_list args)
+{
+        struct gk20a *g = timeout->g;
+        ktime_t now = ktime_get();
+
+        if (nvgpu_timeout_is_pre_silicon(timeout))
+                return 0;
+
+        if (ktime_after(now, ns_to_ktime(timeout->time))) {
+                if (!(timeout->flags & NVGPU_TIMER_SILENT_TIMEOUT)) {
+                        char buf[128];
+
+                        vsnprintf(buf, sizeof(buf), fmt, args);
+
+                        nvgpu_err(g, "Timeout detected @ %pF %s", caller, buf);
+                }
+
+                return -ETIMEDOUT;
+        }
+
+        return 0;
+}
+
+static int __nvgpu_timeout_expired_msg_retry(struct nvgpu_timeout *timeout,
+                                           void *caller,
+                                           const char *fmt, va_list args)
+{
+        struct gk20a *g = timeout->g;
+
+        if (nvgpu_timeout_is_pre_silicon(timeout))
+                return 0;
+
+        if (timeout->retries.attempted >= timeout->retries.max) {
+                if (!(timeout->flags & NVGPU_TIMER_SILENT_TIMEOUT)) {
+                        char buf[128];
+
+                        vsnprintf(buf, sizeof(buf), fmt, args);
+
+                        nvgpu_err(g, "No more retries @ %pF %s", caller, buf);
+                }
+
+                return -ETIMEDOUT;
+        }
+
+        timeout->retries.attempted++;
+
+        return 0;
+}
+
+/**
+ * __nvgpu_timeout_expired_msg - Check if a timeout has expired.
+ *
+ * @timeout - The timeout to check.
+ * @caller  - Address of the caller of this function.
+ * @fmt     - The fmt string.
+ *
+ * Returns -ETIMEDOUT if the timeout has expired, 0 otherwise.
+ *
+ * If a timeout occurs and %NVGPU_TIMER_SILENT_TIMEOUT is not set in the timeout
+ * then a message is printed based on %fmt.
+ */
+int __nvgpu_timeout_expired_msg(struct nvgpu_timeout *timeout,
+                              void *caller, const char *fmt, ...)
+{
+        int ret;
+        va_list args;
+
+        va_start(args, fmt);
+        if (timeout->flags & NVGPU_TIMER_RETRY_TIMER)
+                ret = __nvgpu_timeout_expired_msg_retry(timeout, caller, fmt,
+                                                      args);
+        else
+                ret = __nvgpu_timeout_expired_msg_cpu(timeout, caller, fmt,
+                                                    args);
+        va_end(args);
+
+        return ret;
+}
+
+/**
+ * nvgpu_timeout_peek_expired - Check the status of a timeout.
+ *
+ * @timeout - The timeout to check.
+ *
+ * Returns non-zero if the timeout is expired, zero otherwise. In the case of
+ * retry timers this will not increment the underlying retry count. Also if the
+ * timer has expired no messages will be printed.
+ *
+ * This function honors the pre-Si check as well.
+ */
+int nvgpu_timeout_peek_expired(struct nvgpu_timeout *timeout)
+{
+        if (nvgpu_timeout_is_pre_silicon(timeout))
+                return 0;
+
+        if (timeout->flags & NVGPU_TIMER_RETRY_TIMER)
+                return timeout->retries.attempted >= timeout->retries.max;
+        else
+                return ktime_after(ktime_get(), ns_to_ktime(timeout->time));
+}
+
+/**
+ * nvgpu_udelay - Delay for some number of microseconds.
+ *
+ * @usecs - Microseconds to wait for.
+ *
+ * Wait for at least @usecs microseconds. This is not guaranteed to be perfectly
+ * accurate. This is normally backed by a busy-loop so this means waits should
+ * be kept short, below 100us. If longer delays are necessary then
+ * nvgpu_msleep() should be preferred.
+ *
+ * Alternatively, on some platforms, nvgpu_usleep_range() is usable. This
+ * function will attempt to not use a busy-loop.
+ */
+void nvgpu_udelay(unsigned int usecs)
+{
+        udelay(usecs);
+}
+
+/**
+ * nvgpu_usleep_range - Sleep for a range of microseconds.
+ *
+ * @min_us - Minimum wait time.
+ * @max_us - Maximum wait time.
+ *
+ * Wait for some number of microseconds between @min_us and @max_us. This,
+ * unlike nvgpu_udelay(), will attempt to sleep for the passed number of
+ * microseconds instead of busy looping. Not all platforms support this,
+ * and in that case this reduces to nvgpu_udelay(min_us).
+ *
+ * Linux note: this is not safe to use in atomic context. If you are in
+ * atomic context you must use nvgpu_udelay().
+ */
+void nvgpu_usleep_range(unsigned int min_us, unsigned int max_us)
+{
+        usleep_range(min_us, max_us);
+}
+
+/**
+ * nvgpu_msleep - Sleep for some milliseconds.
+ *
+ * @msecs - Sleep for at least this many milliseconds.
+ *
+ * Sleep for at least @msecs of milliseconds. For small @msecs (less than 20 ms
+ * or so) the sleep will be significantly longer due to scheduling overhead and
+ * mechanics.
+ */
+void nvgpu_msleep(unsigned int msecs)
+{
+        msleep(msecs);
+}
+
+/**
+ * nvgpu_current_time_ms - Time in milliseconds from a monotonic clock.
+ *
+ * Return a clock in millisecond units. The start time of the clock is
+ * unspecified; the time returned can be compared with older ones to measure
+ * durations. The source clock does not jump when the system clock is adjusted.
+ */
+s64 nvgpu_current_time_ms(void)
+{
+        return ktime_to_ms(ktime_get());
+}
+
+/**
+ * nvgpu_current_time_ns - Time in nanoseconds from a monotonic clock.
+ *
+ * Return a clock in nanosecond units. The start time of the clock is
+ * unspecified; the time returned can be compared with older ones to measure
+ * durations. The source clock does not jump when the system clock is adjusted.
+ */
+s64 nvgpu_current_time_ns(void)
+{
+        return ktime_to_ns(ktime_get());
+}
+
+/**
+ * nvgpu_hr_timestamp - Opaque 'high resolution' time stamp.
+ *
+ * Return a "high resolution" time stamp. It does not really matter exactly what
+ * it is, so long as it generally returns unique values and monotonically
+ * increases - wrap around _is_ possible though in a system running for long
+ * enough.
+ *
+ * Note: what high resolution means is system dependent.
+ */
+u64 nvgpu_hr_timestamp(void)
+{
+        return get_cycles();
+}
diff --git a/include/os/linux/vgpu/fecs_trace_vgpu.c b/include/os/linux/vgpu/fecs_trace_vgpu.c
new file mode 100644
index 0000000..02a381e
--- /dev/null
+++ b/include/os/linux/vgpu/fecs_trace_vgpu.c
@@ -0,0 +1,225 @@
+/*
+ * Copyright (c) 2016-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <uapi/linux/nvgpu.h>
+
+#include <nvgpu/kmem.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/enabled.h>
+#include <nvgpu/ctxsw_trace.h>
+#include <nvgpu/vgpu/vgpu_ivm.h>
+#include <nvgpu/vgpu/tegra_vgpu.h>
+#include <nvgpu/vgpu/vgpu.h>
+#include <nvgpu/gk20a.h>
+
+#include "os/linux/os_linux.h"
+#include "gk20a/fecs_trace_gk20a.h"
+#include "vgpu/fecs_trace_vgpu.h"
+
+struct vgpu_fecs_trace {
+        struct tegra_hv_ivm_cookie *cookie;
+        struct nvgpu_ctxsw_ring_header *header;
+        struct nvgpu_gpu_ctxsw_trace_entry *entries;
+        int num_entries;
+        bool enabled;
+        void *buf;
+};
+
+int vgpu_fecs_trace_init(struct gk20a *g)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct device_node *np = dev->of_node;
+        struct of_phandle_args args;
+        struct vgpu_fecs_trace *vcst;
+        u32 mempool;
+        int err;
+
+        nvgpu_log_fn(g, " ");
+
+        vcst = nvgpu_kzalloc(g, sizeof(*vcst));
+        if (!vcst)
+                return -ENOMEM;
+
+        err = of_parse_phandle_with_fixed_args(np,
+                        "mempool-fecs-trace", 1, 0, &args);
+        if (err) {
+                nvgpu_info(g, "does not support fecs trace");
+                goto fail;
+        }
+        __nvgpu_set_enabled(g, NVGPU_SUPPORT_FECS_CTXSW_TRACE, true);
+
+        mempool = args.args[0];
+        vcst->cookie = vgpu_ivm_mempool_reserve(mempool);
+        if (IS_ERR(vcst->cookie)) {
+                nvgpu_info(g,
+                        "mempool  %u reserve failed", mempool);
+                vcst->cookie = NULL;
+                err = -EINVAL;
+                goto fail;
+        }
+
+        vcst->buf = ioremap_cache(vgpu_ivm_get_ipa(vcst->cookie),
+                        vgpu_ivm_get_size(vcst->cookie));
+        if (!vcst->buf) {
+                nvgpu_info(g, "ioremap_cache failed");
+                err = -EINVAL;
+                goto fail;
+        }
+        vcst->header = vcst->buf;
+        vcst->num_entries = vcst->header->num_ents;
+        if (unlikely(vcst->header->ent_size != sizeof(*vcst->entries))) {
+                nvgpu_err(g, "entry size mismatch");
+                goto fail;
+        }
+        vcst->entries = vcst->buf + sizeof(*vcst->header);
+        g->fecs_trace = (struct gk20a_fecs_trace *)vcst;
+
+        return 0;
+fail:
+        iounmap(vcst->buf);
+        if (vcst->cookie)
+                vgpu_ivm_mempool_unreserve(vcst->cookie);
+        nvgpu_kfree(g, vcst);
+        return err;
+}
+
+int vgpu_fecs_trace_deinit(struct gk20a *g)
+{
+        struct vgpu_fecs_trace *vcst = (struct vgpu_fecs_trace *)g->fecs_trace;
+
+        iounmap(vcst->buf);
+        vgpu_ivm_mempool_unreserve(vcst->cookie);
+        nvgpu_kfree(g, vcst);
+        return 0;
+}
+
+int vgpu_fecs_trace_enable(struct gk20a *g)
+{
+        struct vgpu_fecs_trace *vcst = (struct vgpu_fecs_trace *)g->fecs_trace;
+        struct tegra_vgpu_cmd_msg msg = {
+                .cmd = TEGRA_VGPU_CMD_FECS_TRACE_ENABLE,
+                .handle = vgpu_get_handle(g),
+        };
+        int err;
+
+        err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
+        err = err ? err : msg.ret;
+        WARN_ON(err);
+        vcst->enabled = !err;
+        return err;
+}
+
+int vgpu_fecs_trace_disable(struct gk20a *g)
+{
+        struct vgpu_fecs_trace *vcst = (struct vgpu_fecs_trace *)g->fecs_trace;
+        struct tegra_vgpu_cmd_msg msg = {
+                .cmd = TEGRA_VGPU_CMD_FECS_TRACE_DISABLE,
+                .handle = vgpu_get_handle(g),
+        };
+        int err;
+
+        vcst->enabled = false;
+        err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
+        err = err ? err : msg.ret;
+        WARN_ON(err);
+        return err;
+}
+
+bool vgpu_fecs_trace_is_enabled(struct gk20a *g)
+{
+        struct vgpu_fecs_trace *vcst = (struct vgpu_fecs_trace *)g->fecs_trace;
+
+        return (vcst && vcst->enabled);
+}
+
+int vgpu_fecs_trace_poll(struct gk20a *g)
+{
+        struct tegra_vgpu_cmd_msg msg = {
+                .cmd = TEGRA_VGPU_CMD_FECS_TRACE_POLL,
+                .handle = vgpu_get_handle(g),
+        };
+        int err;
+
+        err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
+        err = err ? err : msg.ret;
+        WARN_ON(err);
+        return err;
+}
+
+int vgpu_alloc_user_buffer(struct gk20a *g, void **buf, size_t *size)
+{
+        struct vgpu_fecs_trace *vcst = (struct vgpu_fecs_trace *)g->fecs_trace;
+
+        *buf = vcst->buf;
+        *size = vgpu_ivm_get_size(vcst->cookie);
+        return 0;
+}
+
+int vgpu_free_user_buffer(struct gk20a *g)
+{
+        return 0;
+}
+
+int vgpu_mmap_user_buffer(struct gk20a *g, struct vm_area_struct *vma)
+{
+        struct vgpu_fecs_trace *vcst = (struct vgpu_fecs_trace *)g->fecs_trace;
+        unsigned long size = vgpu_ivm_get_size(vcst->cookie);
+        unsigned long vsize = vma->vm_end - vma->vm_start;
+
+        size = min(size, vsize);
+        size = round_up(size, PAGE_SIZE);
+
+        return remap_pfn_range(vma, vma->vm_start,
+                        vgpu_ivm_get_ipa(vcst->cookie) >> PAGE_SHIFT,
+                        size,
+                        vma->vm_page_prot);
+}
+
+#ifdef CONFIG_GK20A_CTXSW_TRACE
+int vgpu_fecs_trace_max_entries(struct gk20a *g,
+                        struct nvgpu_gpu_ctxsw_trace_filter *filter)
+{
+        struct vgpu_fecs_trace *vcst = (struct vgpu_fecs_trace *)g->fecs_trace;
+
+        return vcst->header->num_ents;
+}
+
+#if NVGPU_CTXSW_FILTER_SIZE != TEGRA_VGPU_FECS_TRACE_FILTER_SIZE
+#error "FECS trace filter size mismatch!"
+#endif
+
+int vgpu_fecs_trace_set_filter(struct gk20a *g,
+                        struct nvgpu_gpu_ctxsw_trace_filter *filter)
+{
+        struct tegra_vgpu_cmd_msg msg = {
+                .cmd = TEGRA_VGPU_CMD_FECS_TRACE_SET_FILTER,
+                .handle = vgpu_get_handle(g),
+        };
+        struct tegra_vgpu_fecs_trace_filter *p = &msg.params.fecs_trace_filter;
+        int err;
+
+        memcpy(&p->tag_bits, &filter->tag_bits, sizeof(p->tag_bits));
+        err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
+        err = err ? err : msg.ret;
+        WARN_ON(err);
+        return err;
+}
+
+void vgpu_fecs_trace_data_update(struct gk20a *g)
+{
+        gk20a_ctxsw_trace_wake_up(g, 0);
+}
+#endif /* CONFIG_GK20A_CTXSW_TRACE */
diff --git a/include/os/linux/vgpu/gv11b/platform_gv11b_vgpu_tegra.c b/include/os/linux/vgpu/gv11b/platform_gv11b_vgpu_tegra.c
new file mode 100644
index 0000000..0304bcc
--- /dev/null
+++ b/include/os/linux/vgpu/gv11b/platform_gv11b_vgpu_tegra.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/platform_device.h>
+
+#include <nvgpu/nvhost.h>
+#include <nvgpu/gk20a.h>
+
+#include "vgpu/clk_vgpu.h"
+#include "os/linux/platform_gk20a.h"
+#include "os/linux/os_linux.h"
+#include "os/linux/vgpu/vgpu_linux.h"
+#include "os/linux/vgpu/platform_vgpu_tegra.h"
+
+static int gv11b_vgpu_probe(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        struct resource *r;
+        void __iomem *regs;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(platform->g);
+        struct gk20a *g = platform->g;
+        int ret;
+
+        r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "usermode");
+        if (!r) {
+                nvgpu_err(g, "failed to get usermode regs");
+                return -ENXIO;
+        }
+        regs = devm_ioremap_resource(dev, r);
+        if (IS_ERR(regs)) {
+                nvgpu_err(g, "failed to map usermode regs");
+                return PTR_ERR(regs);
+        }
+        l->usermode_regs = regs;
+
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        ret = nvgpu_get_nvhost_dev(g);
+        if (ret) {
+                l->usermode_regs = NULL;
+                return ret;
+        }
+
+        ret = nvgpu_nvhost_syncpt_unit_interface_get_aperture(g->nvhost_dev,
+                                                        &g->syncpt_unit_base,
+                                                        &g->syncpt_unit_size);
+        if (ret) {
+                nvgpu_err(g, "Failed to get syncpt interface");
+                return -ENOSYS;
+        }
+        g->syncpt_size = nvgpu_nvhost_syncpt_unit_interface_get_byte_offset(1);
+        nvgpu_info(g, "syncpt_unit_base %llx syncpt_unit_size %zx size %x\n",
+                g->syncpt_unit_base, g->syncpt_unit_size, g->syncpt_size);
+#endif
+        vgpu_init_clk_support(platform->g);
+
+        return 0;
+}
+
+struct gk20a_platform gv11b_vgpu_tegra_platform = {
+        .has_syncpoints = true,
+
+        /* power management configuration */
+        .can_railgate_init      = false,
+        .can_elpg_init          = false,
+        .enable_slcg            = false,
+        .enable_blcg            = false,
+        .enable_elcg            = false,
+        .enable_elpg            = false,
+        .enable_aelpg           = false,
+        .can_slcg               = false,
+        .can_blcg               = false,
+        .can_elcg               = false,
+
+        .ch_wdt_timeout_ms = 5000,
+
+        .probe = gv11b_vgpu_probe,
+
+        .clk_round_rate = vgpu_plat_clk_round_rate,
+        .get_clk_freqs = vgpu_plat_clk_get_freqs,
+
+        /* frequency scaling configuration */
+        .devfreq_governor = "userspace",
+
+        .virtual_dev = true,
+
+        /* power management callbacks */
+        .suspend = vgpu_tegra_suspend,
+        .resume = vgpu_tegra_resume,
+};
diff --git a/include/os/linux/vgpu/platform_vgpu_tegra.c b/include/os/linux/vgpu/platform_vgpu_tegra.c
new file mode 100644
index 0000000..948323e
--- /dev/null
+++ b/include/os/linux/vgpu/platform_vgpu_tegra.c
@@ -0,0 +1,97 @@
+/*
+ * Tegra Virtualized GPU Platform Interface
+ *
+ * Copyright (c) 2014-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <nvgpu/nvhost.h>
+#include <nvgpu/gk20a.h>
+
+#include "os/linux/platform_gk20a.h"
+#include "vgpu/clk_vgpu.h"
+#include "vgpu_linux.h"
+
+static int gk20a_tegra_probe(struct device *dev)
+{
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        int ret;
+
+        ret = nvgpu_get_nvhost_dev(platform->g);
+        if (ret)
+                return ret;
+
+        vgpu_init_clk_support(platform->g);
+        return 0;
+#else
+        return 0;
+#endif
+}
+
+long vgpu_plat_clk_round_rate(struct device *dev, unsigned long rate)
+{
+        /* server will handle frequency rounding */
+        return rate;
+}
+
+int vgpu_plat_clk_get_freqs(struct device *dev, unsigned long **freqs,
+                        int *num_freqs)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a *g = platform->g;
+
+        return vgpu_clk_get_freqs(g, freqs, num_freqs);
+}
+
+int vgpu_plat_clk_cap_rate(struct device *dev, unsigned long rate)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a *g = platform->g;
+
+        return vgpu_clk_cap_rate(g, rate);
+}
+
+struct gk20a_platform vgpu_tegra_platform = {
+        .has_syncpoints = true,
+        .aggressive_sync_destroy_thresh = 64,
+
+        /* power management configuration */
+        .can_railgate_init      = false,
+        .can_elpg_init          = false,
+        .enable_slcg            = false,
+        .enable_blcg            = false,
+        .enable_elcg            = false,
+        .enable_elpg            = false,
+        .enable_aelpg           = false,
+        .can_slcg               = false,
+        .can_blcg               = false,
+        .can_elcg               = false,
+
+        .ch_wdt_timeout_ms = 5000,
+
+        .probe = gk20a_tegra_probe,
+
+        .clk_round_rate = vgpu_plat_clk_round_rate,
+        .get_clk_freqs = vgpu_plat_clk_get_freqs,
+
+        /* frequency scaling configuration */
+        .devfreq_governor = "userspace",
+
+        .virtual_dev = true,
+
+        /* power management callbacks */
+        .suspend = vgpu_tegra_suspend,
+        .resume = vgpu_tegra_resume,
+};
diff --git a/include/os/linux/vgpu/platform_vgpu_tegra.h b/include/os/linux/vgpu/platform_vgpu_tegra.h
new file mode 100644
index 0000000..fef346d
--- /dev/null
+++ b/include/os/linux/vgpu/platform_vgpu_tegra.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _VGPU_PLATFORM_H_
+#define _VGPU_PLATFORM_H_
+
+long vgpu_plat_clk_round_rate(struct device *dev, unsigned long rate);
+int vgpu_plat_clk_get_freqs(struct device *dev, unsigned long **freqs,
+                        int *num_freqs);
+int vgpu_plat_clk_cap_rate(struct device *dev, unsigned long rate);
+#endif
diff --git a/include/os/linux/vgpu/sysfs_vgpu.c b/include/os/linux/vgpu/sysfs_vgpu.c
new file mode 100644
index 0000000..ade5d82
--- /dev/null
+++ b/include/os/linux/vgpu/sysfs_vgpu.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2017-2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/device.h>
+#include <nvgpu/vgpu/vgpu.h>
+
+#include "os/linux/platform_gk20a.h"
+#include "os/linux/os_linux.h"
+#include "vgpu/ecc_vgpu.h"
+
+static ssize_t vgpu_load_show(struct device *dev,
+                              struct device_attribute *attr,
+                              char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct tegra_vgpu_cmd_msg msg = {0};
+        struct tegra_vgpu_gpu_load_params *p = &msg.params.gpu_load;
+        int err;
+
+        msg.cmd = TEGRA_VGPU_CMD_GET_GPU_LOAD;
+        msg.handle = vgpu_get_handle(g);
+        err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
+        if (err)
+                return err;
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", p->load);
+}
+static DEVICE_ATTR(load, S_IRUGO, vgpu_load_show, NULL);
+
+static ssize_t vgpu_ecc_stat_show(struct device *dev,
+                              struct device_attribute *attr,
+                              char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct tegra_vgpu_cmd_msg msg = {0};
+        struct tegra_vgpu_ecc_counter_params *p = &msg.params.ecc_counter;
+        struct dev_ext_attribute *ext_attr = container_of(attr,
+                        struct dev_ext_attribute, attr);
+        struct vgpu_ecc_stat *ecc_stat = ext_attr->var;
+        int err;
+
+        p->ecc_id = ecc_stat->ecc_id;
+
+        msg.cmd = TEGRA_VGPU_CMD_GET_ECC_COUNTER_VALUE;
+        msg.handle = vgpu_get_handle(g);
+        err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
+        err = err ? err : msg.ret;
+        if (unlikely(err)) {
+                nvgpu_err(g, "ecc: cannot get ECC counter value: %d", err);
+                return err;
+        }
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", p->value);
+}
+
+static int vgpu_create_ecc_sysfs(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct vgpu_priv_data *priv = vgpu_get_priv_data(g);
+        struct vgpu_ecc_stat *stats;
+        struct dev_ext_attribute *attrs;
+        int err, i, count;
+
+        err = vgpu_ecc_get_info(g);
+        if (unlikely(err)) {
+                nvgpu_err(g, "ecc: cannot get ECC info: %d", err);
+                return err;
+        }
+
+        stats = priv->ecc_stats;
+        count = priv->ecc_stats_count;
+
+        attrs = nvgpu_kzalloc(g, count * sizeof(*attrs));
+        if (unlikely(!attrs)) {
+                nvgpu_err(g, "ecc: no memory");
+                vgpu_ecc_remove_info(g);
+                return -ENOMEM;
+        }
+
+        for (i = 0; i < count; i++) {
+                sysfs_attr_init(&attrs[i].attr.attr);
+                attrs[i].attr.attr.name = stats[i].name;
+                attrs[i].attr.attr.mode = VERIFY_OCTAL_PERMISSIONS(S_IRUGO);
+                attrs[i].attr.show = vgpu_ecc_stat_show;
+                attrs[i].attr.store = NULL;
+                attrs[i].var = &stats[i];
+
+                err = device_create_file(dev, &attrs[i].attr);
+                if (unlikely(err)) {
+                        nvgpu_warn(g, "ecc: cannot create file \"%s\": %d",
+                                   stats[i].name, err);
+                }
+        }
+
+        l->ecc_attrs = attrs;
+        return 0;
+}
+
+static void vgpu_remove_ecc_sysfs(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct vgpu_priv_data *priv = vgpu_get_priv_data(g);
+        int i;
+
+        if (l->ecc_attrs) {
+                for (i = 0; i < priv->ecc_stats_count; i++)
+                        device_remove_file(dev, &l->ecc_attrs[i].attr);
+
+                nvgpu_kfree(g, l->ecc_attrs);
+                l->ecc_attrs = NULL;
+        }
+
+        vgpu_ecc_remove_info(g);
+}
+
+void vgpu_create_sysfs(struct device *dev)
+{
+        if (device_create_file(dev, &dev_attr_load))
+                dev_err(dev, "Failed to create vgpu sysfs attributes!\n");
+
+        vgpu_create_ecc_sysfs(dev);
+}
+
+void vgpu_remove_sysfs(struct device *dev)
+{
+        device_remove_file(dev, &dev_attr_load);
+        vgpu_remove_ecc_sysfs(dev);
+}
diff --git a/include/os/linux/vgpu/vgpu_ivc.c b/include/os/linux/vgpu/vgpu_ivc.c
new file mode 100644
index 0000000..950f0d4
--- /dev/null
+++ b/include/os/linux/vgpu/vgpu_ivc.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <nvgpu/types.h>
+#include <linux/tegra_gr_comm.h>
+
+#include "os/linux/os_linux.h"
+
+int vgpu_ivc_init(struct gk20a *g, u32 elems,
+                const size_t *queue_sizes, u32 queue_start, u32 num_queues)
+{
+        struct platform_device *pdev = to_platform_device(dev_from_gk20a(g));
+
+        return tegra_gr_comm_init(pdev, elems, queue_sizes, queue_start,
+                                num_queues);
+}
+
+void vgpu_ivc_deinit(u32 queue_start, u32 num_queues)
+{
+        tegra_gr_comm_deinit(queue_start, num_queues);
+}
+
+void vgpu_ivc_release(void *handle)
+{
+        tegra_gr_comm_release(handle);
+}
+
+u32 vgpu_ivc_get_server_vmid(void)
+{
+        return tegra_gr_comm_get_server_vmid();
+}
+
+int vgpu_ivc_recv(u32 index, void **handle, void **data,
+                                size_t *size, u32 *sender)
+{
+        return tegra_gr_comm_recv(index, handle, data, size, sender);
+}
+
+int vgpu_ivc_send(u32 peer, u32 index, void *data, size_t size)
+{
+        return tegra_gr_comm_send(peer, index, data, size);
+}
+
+int vgpu_ivc_sendrecv(u32 peer, u32 index, void **handle,
+                                void **data, size_t *size)
+{
+        return tegra_gr_comm_sendrecv(peer, index, handle, data, size);
+}
+
+u32 vgpu_ivc_get_peer_self(void)
+{
+        return TEGRA_GR_COMM_ID_SELF;
+}
+
+void *vgpu_ivc_oob_get_ptr(u32 peer, u32 index, void **ptr,
+                                        size_t *size)
+{
+        return tegra_gr_comm_oob_get_ptr(peer, index, ptr, size);
+}
+
+void vgpu_ivc_oob_put_ptr(void *handle)
+{
+        tegra_gr_comm_oob_put_ptr(handle);
+}
diff --git a/include/os/linux/vgpu/vgpu_ivm.c b/include/os/linux/vgpu/vgpu_ivm.c
new file mode 100644
index 0000000..bbd444d
--- /dev/null
+++ b/include/os/linux/vgpu/vgpu_ivm.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <nvgpu/vgpu/vgpu_ivm.h>
+
+#include <linux/tegra-ivc.h>
+
+#include "os/linux/os_linux.h"
+
+struct tegra_hv_ivm_cookie *vgpu_ivm_mempool_reserve(unsigned int id)
+{
+        return tegra_hv_mempool_reserve(id);
+}
+
+int vgpu_ivm_mempool_unreserve(struct tegra_hv_ivm_cookie *cookie)
+{
+        return tegra_hv_mempool_unreserve(cookie);
+}
+
+u64 vgpu_ivm_get_ipa(struct tegra_hv_ivm_cookie *cookie)
+{
+        return cookie->ipa;
+}
+
+u64 vgpu_ivm_get_size(struct tegra_hv_ivm_cookie *cookie)
+{
+        return cookie->size;
+}
+
+void *vgpu_ivm_mempool_map(struct tegra_hv_ivm_cookie *cookie)
+{
+        return ioremap_cache(vgpu_ivm_get_ipa(cookie),
+                                vgpu_ivm_get_size(cookie));
+}
+
+void vgpu_ivm_mempool_unmap(struct tegra_hv_ivm_cookie *cookie,
+                void *addr)
+{
+        iounmap(addr);
+}
diff --git a/include/os/linux/vgpu/vgpu_linux.c b/include/os/linux/vgpu/vgpu_linux.c
new file mode 100644
index 0000000..80bcfff
--- /dev/null
+++ b/include/os/linux/vgpu/vgpu_linux.c
@@ -0,0 +1,525 @@
+/*
+ * Virtualized GPU for Linux
+ *
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/pm_runtime.h>
+#include <linux/pm_qos.h>
+#include <linux/platform_device.h>
+#include <soc/tegra/chip-id.h>
+
+#include <nvgpu/kmem.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/enabled.h>
+#include <nvgpu/debug.h>
+#include <nvgpu/soc.h>
+#include <nvgpu/ctxsw_trace.h>
+#include <nvgpu/defaults.h>
+#include <nvgpu/ltc.h>
+#include <nvgpu/channel.h>
+#include <nvgpu/clk_arb.h>
+
+#include "vgpu_linux.h"
+#include "vgpu/fecs_trace_vgpu.h"
+#include "vgpu/clk_vgpu.h"
+#include "gk20a/regops_gk20a.h"
+#include "gm20b/hal_gm20b.h"
+
+#include "os/linux/module.h"
+#include "os/linux/os_linux.h"
+#include "os/linux/ioctl.h"
+#include "os/linux/scale.h"
+#include "os/linux/driver_common.h"
+#include "os/linux/platform_gk20a.h"
+#include "os/linux/vgpu/platform_vgpu_tegra.h"
+
+struct vgpu_priv_data *vgpu_get_priv_data(struct gk20a *g)
+{
+        struct gk20a_platform *plat = gk20a_get_platform(dev_from_gk20a(g));
+
+        return (struct vgpu_priv_data *)plat->vgpu_priv;
+}
+
+static void vgpu_remove_support(struct gk20a *g)
+{
+        vgpu_remove_support_common(g);
+}
+
+static void vgpu_init_vars(struct gk20a *g, struct gk20a_platform *platform)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct vgpu_priv_data *priv = vgpu_get_priv_data(g);
+
+        nvgpu_mutex_init(&g->power_lock);
+        nvgpu_mutex_init(&g->ctxsw_disable_lock);
+        nvgpu_mutex_init(&g->clk_arb_enable_lock);
+        nvgpu_mutex_init(&g->cg_pg_lock);
+
+        nvgpu_mutex_init(&priv->vgpu_clk_get_freq_lock);
+
+        nvgpu_mutex_init(&l->ctrl.privs_lock);
+        nvgpu_init_list_node(&l->ctrl.privs);
+
+        l->regs_saved = l->regs;
+        l->bar1_saved = l->bar1;
+
+        nvgpu_atomic_set(&g->clk_arb_global_nr, 0);
+
+        g->aggressive_sync_destroy = platform->aggressive_sync_destroy;
+        g->aggressive_sync_destroy_thresh = platform->aggressive_sync_destroy_thresh;
+        __nvgpu_set_enabled(g, NVGPU_HAS_SYNCPOINTS, platform->has_syncpoints);
+        g->ptimer_src_freq = platform->ptimer_src_freq;
+        __nvgpu_set_enabled(g, NVGPU_CAN_RAILGATE, platform->can_railgate_init);
+        g->railgate_delay = platform->railgate_delay_init;
+
+        __nvgpu_set_enabled(g, NVGPU_MM_UNIFY_ADDRESS_SPACES,
+                            platform->unify_address_spaces);
+}
+
+static int vgpu_init_support(struct platform_device *pdev)
+{
+        struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        struct gk20a *g = get_gk20a(&pdev->dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        void __iomem *regs;
+        int err = 0;
+
+        if (!r) {
+                nvgpu_err(g, "failed to get gk20a bar1");
+                err = -ENXIO;
+                goto fail;
+        }
+
+        if (r->name && !strcmp(r->name, "/vgpu")) {
+                regs = devm_ioremap_resource(&pdev->dev, r);
+                if (IS_ERR(regs)) {
+                        nvgpu_err(g, "failed to remap gk20a bar1");
+                        err = PTR_ERR(regs);
+                        goto fail;
+                }
+                l->bar1 = regs;
+                l->bar1_mem = r;
+        }
+
+        nvgpu_mutex_init(&g->dbg_sessions_lock);
+        nvgpu_mutex_init(&g->client_lock);
+
+        nvgpu_init_list_node(&g->profiler_objects);
+
+        g->dbg_regops_tmp_buf = nvgpu_kzalloc(g, SZ_4K);
+        if (!g->dbg_regops_tmp_buf) {
+                nvgpu_err(g, "couldn't allocate regops tmp buf");
+                return -ENOMEM;
+        }
+        g->dbg_regops_tmp_buf_ops =
+                SZ_4K / sizeof(g->dbg_regops_tmp_buf[0]);
+
+        g->remove_support = vgpu_remove_support;
+        return 0;
+
+ fail:
+        vgpu_remove_support(g);
+        return err;
+}
+
+int vgpu_pm_prepare_poweroff(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        int ret = 0;
+
+        nvgpu_log_fn(g, " ");
+
+        nvgpu_mutex_acquire(&g->power_lock);
+
+        if (!g->power_on)
+                goto done;
+
+        if (g->ops.fifo.channel_suspend)
+                ret = g->ops.fifo.channel_suspend(g);
+        if (ret)
+                goto done;
+
+        g->power_on = false;
+ done:
+        nvgpu_mutex_release(&g->power_lock);
+
+        return ret;
+}
+
+int vgpu_pm_finalize_poweron(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        int err = 0;
+
+        nvgpu_log_fn(g, " ");
+
+        nvgpu_mutex_acquire(&g->power_lock);
+
+        if (g->power_on)
+                goto done;
+
+        g->power_on = true;
+
+        vgpu_detect_chip(g);
+        err = vgpu_init_hal(g);
+        if (err)
+                goto done;
+
+        if (g->ops.ltc.init_fs_state)
+                g->ops.ltc.init_fs_state(g);
+
+        err = nvgpu_init_ltc_support(g);
+        if (err) {
+                nvgpu_err(g, "failed to init ltc");
+                goto done;
+        }
+
+        err = vgpu_init_mm_support(g);
+        if (err) {
+                nvgpu_err(g, "failed to init gk20a mm");
+                goto done;
+        }
+
+        err = vgpu_init_fifo_support(g);
+        if (err) {
+                nvgpu_err(g, "failed to init gk20a fifo");
+                goto done;
+        }
+
+        err = vgpu_init_gr_support(g);
+        if (err) {
+                nvgpu_err(g, "failed to init gk20a gr");
+                goto done;
+        }
+
+        err = nvgpu_clk_arb_init_arbiter(g);
+        if (err) {
+                nvgpu_err(g, "failed to init clk arb");
+                goto done;
+        }
+
+        err = g->ops.chip_init_gpu_characteristics(g);
+        if (err) {
+                nvgpu_err(g, "failed to init gk20a gpu characteristics");
+                goto done;
+        }
+
+        err = nvgpu_finalize_poweron_linux(l);
+        if (err)
+                goto done;
+
+#ifdef CONFIG_GK20A_CTXSW_TRACE
+        gk20a_ctxsw_trace_init(g);
+#endif
+        gk20a_sched_ctrl_init(g);
+        gk20a_channel_resume(g);
+
+        g->sw_ready = true;
+
+done:
+        if (err)
+                g->power_on = false;
+
+        nvgpu_mutex_release(&g->power_lock);
+        return err;
+}
+
+static int vgpu_qos_notify(struct notifier_block *nb,
+                          unsigned long n, void *data)
+{
+        struct gk20a_scale_profile *profile =
+                        container_of(nb, struct gk20a_scale_profile,
+                        qos_notify_block);
+        struct gk20a *g = get_gk20a(profile->dev);
+        u32 max_freq;
+        int err;
+
+        nvgpu_log_fn(g, " ");
+
+        max_freq = (u32)pm_qos_read_max_bound(PM_QOS_GPU_FREQ_BOUNDS);
+        err = vgpu_plat_clk_cap_rate(profile->dev, max_freq);
+        if (err)
+                nvgpu_err(g, "%s failed, err=%d", __func__, err);
+
+        return NOTIFY_OK; /* need notify call further */
+}
+
+static int vgpu_pm_qos_init(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gk20a_scale_profile *profile = g->scale_profile;
+
+        if (IS_ENABLED(CONFIG_GK20A_DEVFREQ)) {
+                if (!profile)
+                        return -EINVAL;
+        } else {
+                profile = nvgpu_kzalloc(g, sizeof(*profile));
+                if (!profile)
+                        return -ENOMEM;
+                g->scale_profile = profile;
+        }
+
+        profile->dev = dev;
+        profile->qos_notify_block.notifier_call = vgpu_qos_notify;
+        pm_qos_add_max_notifier(PM_QOS_GPU_FREQ_BOUNDS,
+                                &profile->qos_notify_block);
+        return 0;
+}
+
+static void vgpu_pm_qos_remove(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        pm_qos_remove_max_notifier(PM_QOS_GPU_FREQ_BOUNDS,
+                                &g->scale_profile->qos_notify_block);
+        nvgpu_kfree(g, g->scale_profile);
+        g->scale_profile = NULL;
+}
+
+static int vgpu_pm_init(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        unsigned long *freqs;
+        int num_freqs;
+        int err = 0;
+
+        nvgpu_log_fn(g, " ");
+
+        if (nvgpu_platform_is_simulation(g))
+                return 0;
+
+        __pm_runtime_disable(dev, false);
+
+        if (IS_ENABLED(CONFIG_GK20A_DEVFREQ))
+                gk20a_scale_init(dev);
+
+        if (l->devfreq) {
+                /* set min/max frequency based on frequency table */
+                err = platform->get_clk_freqs(dev, &freqs, &num_freqs);
+                if (err)
+                        return err;
+
+                if (num_freqs < 1)
+                        return -EINVAL;
+
+                l->devfreq->min_freq = freqs[0];
+                l->devfreq->max_freq = freqs[num_freqs - 1];
+        }
+
+        err = vgpu_pm_qos_init(dev);
+        if (err)
+                return err;
+
+        return err;
+}
+
+int vgpu_probe(struct platform_device *pdev)
+{
+        struct nvgpu_os_linux *l;
+        struct gk20a *gk20a;
+        int err;
+        struct device *dev = &pdev->dev;
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct vgpu_priv_data *priv;
+
+        if (!platform) {
+                dev_err(dev, "no platform data\n");
+                return -ENODATA;
+        }
+
+        l = kzalloc(sizeof(*l), GFP_KERNEL);
+        if (!l) {
+                dev_err(dev, "couldn't allocate gk20a support");
+                return -ENOMEM;
+        }
+        gk20a = &l->g;
+
+        nvgpu_log_fn(gk20a, " ");
+
+        nvgpu_init_gk20a(gk20a);
+
+        nvgpu_kmem_init(gk20a);
+
+        err = nvgpu_init_enabled_flags(gk20a);
+        if (err) {
+                kfree(gk20a);
+                return err;
+        }
+
+        l->dev = dev;
+        if (tegra_platform_is_vdk())
+                __nvgpu_set_enabled(gk20a, NVGPU_IS_FMODEL, true);
+
+        gk20a->is_virtual = true;
+
+        priv = nvgpu_kzalloc(gk20a, sizeof(*priv));
+        if (!priv) {
+                kfree(gk20a);
+                return -ENOMEM;
+        }
+
+        platform->g = gk20a;
+        platform->vgpu_priv = priv;
+
+        err = gk20a_user_init(dev, INTERFACE_NAME, &nvgpu_class);
+        if (err)
+                return err;
+
+        vgpu_init_support(pdev);
+
+        vgpu_init_vars(gk20a, platform);
+
+        init_rwsem(&l->busy_lock);
+
+        nvgpu_spinlock_init(&gk20a->mc_enable_lock);
+
+        gk20a->ch_wdt_timeout_ms = platform->ch_wdt_timeout_ms;
+
+        /* Initialize the platform interface. */
+        err = platform->probe(dev);
+        if (err) {
+                if (err == -EPROBE_DEFER)
+                        nvgpu_info(gk20a, "platform probe failed");
+                else
+                        nvgpu_err(gk20a, "platform probe failed");
+                return err;
+        }
+
+        if (platform->late_probe) {
+                err = platform->late_probe(dev);
+                if (err) {
+                        nvgpu_err(gk20a, "late probe failed");
+                        return err;
+                }
+        }
+
+        err = vgpu_comm_init(gk20a);
+        if (err) {
+                nvgpu_err(gk20a, "failed to init comm interface");
+                return -ENOSYS;
+        }
+
+        priv->virt_handle = vgpu_connect();
+        if (!priv->virt_handle) {
+                nvgpu_err(gk20a, "failed to connect to server node");
+                vgpu_comm_deinit();
+                return -ENOSYS;
+        }
+
+        err = vgpu_get_constants(gk20a);
+        if (err) {
+                vgpu_comm_deinit();
+                return err;
+        }
+
+        err = vgpu_pm_init(dev);
+        if (err) {
+                nvgpu_err(gk20a, "pm init failed");
+                return err;
+        }
+
+        err = nvgpu_thread_create(&priv->intr_handler, gk20a,
+                        vgpu_intr_thread, "gk20a");
+        if (err)
+                return err;
+
+        gk20a_debug_init(gk20a, "gpu.0");
+
+        /* Set DMA parameters to allow larger sgt lists */
+        dev->dma_parms = &l->dma_parms;
+        dma_set_max_seg_size(dev, UINT_MAX);
+
+        gk20a->gr_idle_timeout_default = NVGPU_DEFAULT_GR_IDLE_TIMEOUT;
+        gk20a->timeouts_disabled_by_user = false;
+        nvgpu_atomic_set(&gk20a->timeouts_disabled_refcount, 0);
+
+        vgpu_create_sysfs(dev);
+        gk20a_init_gr(gk20a);
+
+        nvgpu_log_info(gk20a, "total ram pages : %lu", totalram_pages);
+        gk20a->gr.max_comptag_mem = totalram_size_in_mb;
+
+        nvgpu_ref_init(&gk20a->refcount);
+
+        return 0;
+}
+
+int vgpu_remove(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct gk20a *g = get_gk20a(dev);
+
+        nvgpu_log_fn(g, " ");
+
+        vgpu_pm_qos_remove(dev);
+        if (g->remove_support)
+                g->remove_support(g);
+
+        vgpu_comm_deinit();
+        gk20a_sched_ctrl_cleanup(g);
+        gk20a_user_deinit(dev, &nvgpu_class);
+        vgpu_remove_sysfs(dev);
+        gk20a_get_platform(dev)->g = NULL;
+        gk20a_put(g);
+
+        return 0;
+}
+
+bool vgpu_is_reduced_bar1(struct gk20a *g)
+{
+        struct fifo_gk20a *f = &g->fifo;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        return resource_size(l->bar1_mem) == (resource_size_t)f->userd.size;
+}
+
+int vgpu_tegra_suspend(struct device *dev)
+{
+        struct tegra_vgpu_cmd_msg msg = {};
+        struct gk20a *g = get_gk20a(dev);
+        int err = 0;
+
+        msg.cmd = TEGRA_VGPU_CMD_SUSPEND;
+        msg.handle = vgpu_get_handle(g);
+        err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
+        err = err ? err : msg.ret;
+        if (err)
+                nvgpu_err(g, "vGPU suspend failed\n");
+
+        return err;
+}
+
+int vgpu_tegra_resume(struct device *dev)
+{
+        struct tegra_vgpu_cmd_msg msg = {};
+        struct gk20a *g = get_gk20a(dev);
+        int err = 0;
+
+        msg.cmd = TEGRA_VGPU_CMD_RESUME;
+        msg.handle = vgpu_get_handle(g);
+        err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
+        err = err ? err : msg.ret;
+        if (err)
+                nvgpu_err(g, "vGPU resume failed\n");
+
+        return err;
+}
diff --git a/include/os/linux/vgpu/vgpu_linux.h b/include/os/linux/vgpu/vgpu_linux.h
new file mode 100644
index 0000000..ff7d3a6
--- /dev/null
+++ b/include/os/linux/vgpu/vgpu_linux.h
@@ -0,0 +1,68 @@
+/*
+ * Virtualized GPU Linux Interfaces
+ *
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __VGPU_LINUX_H__
+#define __VGPU_LINUX_H__
+
+struct device;
+struct platform_device;
+
+#ifdef CONFIG_TEGRA_GR_VIRTUALIZATION
+
+#include <nvgpu/vgpu/vgpu.h>
+
+int vgpu_pm_prepare_poweroff(struct device *dev);
+int vgpu_pm_finalize_poweron(struct device *dev);
+int vgpu_probe(struct platform_device *dev);
+int vgpu_remove(struct platform_device *dev);
+
+void vgpu_create_sysfs(struct device *dev);
+void vgpu_remove_sysfs(struct device *dev);
+
+int vgpu_tegra_suspend(struct device *dev);
+int vgpu_tegra_resume(struct device *dev);
+#else
+/* define placeholders for functions used outside of vgpu */
+
+static inline int vgpu_pm_prepare_poweroff(struct device *dev)
+{
+        return -ENOSYS;
+}
+static inline int vgpu_pm_finalize_poweron(struct device *dev)
+{
+        return -ENOSYS;
+}
+static inline int vgpu_probe(struct platform_device *dev)
+{
+        return -ENOSYS;
+}
+static inline int vgpu_remove(struct platform_device *dev)
+{
+        return -ENOSYS;
+}
+static inline int vgpu_tegra_suspend(struct device *dev)
+{
+        return -ENOSYS;
+}
+static inline int vgpu_tegra_resume(struct device *dev)
+{
+        return -ENOSYS;
+}
+#endif
+
+#endif
diff --git a/include/os/linux/vm.c b/include/os/linux/vm.c
new file mode 100644
index 0000000..dc807ab
--- /dev/null
+++ b/include/os/linux/vm.c
@@ -0,0 +1,356 @@
+/*
+ * Copyright (c) 2017-2020, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/dma-buf.h>
+#include <linux/scatterlist.h>
+#include <uapi/linux/nvgpu.h>
+
+#include <nvgpu/log.h>
+#include <nvgpu/lock.h>
+#include <nvgpu/rbtree.h>
+#include <nvgpu/vm_area.h>
+#include <nvgpu/nvgpu_mem.h>
+#include <nvgpu/page_allocator.h>
+#include <nvgpu/vidmem.h>
+#include <nvgpu/utils.h>
+#include <nvgpu/gk20a.h>
+
+#include <nvgpu/linux/vm.h>
+#include <nvgpu/linux/nvgpu_mem.h>
+
+#include "gk20a/mm_gk20a.h"
+
+#include "platform_gk20a.h"
+#include "os_linux.h"
+#include "dmabuf.h"
+#include "dmabuf_vidmem.h"
+
+static u32 nvgpu_vm_translate_linux_flags(struct gk20a *g, u32 flags)
+{
+        u32 core_flags = 0;
+
+        if (flags & NVGPU_AS_MAP_BUFFER_FLAGS_FIXED_OFFSET)
+                core_flags |= NVGPU_VM_MAP_FIXED_OFFSET;
+        if (flags & NVGPU_AS_MAP_BUFFER_FLAGS_CACHEABLE)
+                core_flags |= NVGPU_VM_MAP_CACHEABLE;
+        if (flags & NVGPU_AS_MAP_BUFFER_FLAGS_IO_COHERENT)
+                core_flags |= NVGPU_VM_MAP_IO_COHERENT;
+        if (flags & NVGPU_AS_MAP_BUFFER_FLAGS_UNMAPPED_PTE)
+                core_flags |= NVGPU_VM_MAP_UNMAPPED_PTE;
+        if (flags & NVGPU_AS_MAP_BUFFER_FLAGS_L3_ALLOC)
+                core_flags |= NVGPU_VM_MAP_L3_ALLOC;
+        if (flags & NVGPU_AS_MAP_BUFFER_FLAGS_DIRECT_KIND_CTRL)
+                core_flags |= NVGPU_VM_MAP_DIRECT_KIND_CTRL;
+        if (flags & NVGPU_AS_MAP_BUFFER_FLAGS_PLATFORM_ATOMIC)
+                core_flags |= NVGPU_VM_MAP_PLATFORM_ATOMIC;
+
+        if (flags & NVGPU_AS_MAP_BUFFER_FLAGS_MAPPABLE_COMPBITS)
+                nvgpu_warn(g, "Ignoring deprecated flag: "
+                           "NVGPU_AS_MAP_BUFFER_FLAGS_MAPPABLE_COMPBITS");
+
+        return core_flags;
+}
+
+static struct nvgpu_mapped_buf *__nvgpu_vm_find_mapped_buf_reverse(
+        struct vm_gk20a *vm, struct dma_buf *dmabuf, u32 kind)
+{
+        struct nvgpu_rbtree_node *node = NULL;
+        struct nvgpu_rbtree_node *root = vm->mapped_buffers;
+
+        nvgpu_rbtree_enum_start(0, &node, root);
+
+        while (node) {
+                struct nvgpu_mapped_buf *mapped_buffer =
+                                mapped_buffer_from_rbtree_node(node);
+
+                if (mapped_buffer->os_priv.dmabuf == dmabuf &&
+                    mapped_buffer->kind == kind)
+                        return mapped_buffer;
+
+                nvgpu_rbtree_enum_next(&node, node);
+        }
+
+        return NULL;
+}
+
+int nvgpu_vm_find_buf(struct vm_gk20a *vm, u64 gpu_va,
+                      struct dma_buf **dmabuf,
+                      u64 *offset)
+{
+        struct nvgpu_mapped_buf *mapped_buffer;
+        struct gk20a *g = gk20a_from_vm(vm);
+
+        nvgpu_log_fn(g, "gpu_va=0x%llx", gpu_va);
+
+        nvgpu_mutex_acquire(&vm->update_gmmu_lock);
+
+        mapped_buffer = __nvgpu_vm_find_mapped_buf_range(vm, gpu_va);
+        if (!mapped_buffer) {
+                nvgpu_mutex_release(&vm->update_gmmu_lock);
+                return -EINVAL;
+        }
+
+        *dmabuf = mapped_buffer->os_priv.dmabuf;
+        *offset = gpu_va - mapped_buffer->addr;
+
+        nvgpu_mutex_release(&vm->update_gmmu_lock);
+
+        return 0;
+}
+
+u64 nvgpu_os_buf_get_size(struct nvgpu_os_buffer *os_buf)
+{
+        return os_buf->dmabuf->size;
+}
+
+/*
+ * vm->update_gmmu_lock must be held. This checks to see if we already have
+ * mapped the passed buffer into this VM. If so, just return the existing
+ * mapping address.
+ */
+struct nvgpu_mapped_buf *nvgpu_vm_find_mapping(struct vm_gk20a *vm,
+                                               struct nvgpu_os_buffer *os_buf,
+                                               u64 map_addr,
+                                               u32 flags,
+                                               int kind)
+{
+        struct gk20a *g = gk20a_from_vm(vm);
+        struct nvgpu_mapped_buf *mapped_buffer = NULL;
+
+        if (flags & NVGPU_VM_MAP_FIXED_OFFSET) {
+                mapped_buffer = __nvgpu_vm_find_mapped_buf(vm, map_addr);
+                if (!mapped_buffer)
+                        return NULL;
+
+                if (mapped_buffer->os_priv.dmabuf != os_buf->dmabuf ||
+                    mapped_buffer->kind != (u32)kind)
+                        return NULL;
+        } else {
+                mapped_buffer =
+                        __nvgpu_vm_find_mapped_buf_reverse(vm,
+                                                           os_buf->dmabuf,
+                                                           kind);
+                if (!mapped_buffer)
+                        return NULL;
+        }
+
+        if (mapped_buffer->flags != flags)
+                return NULL;
+
+        /*
+         * If we find the mapping here then that means we have mapped it already
+         * and the prior pin and get must be undone.
+         */
+        gk20a_mm_unpin(os_buf->dev, os_buf->dmabuf, os_buf->attachment,
+                       mapped_buffer->os_priv.sgt);
+        dma_buf_put(os_buf->dmabuf);
+
+        nvgpu_log(g, gpu_dbg_map,
+                  "gv: 0x%04x_%08x + 0x%-7zu "
+                  "[dma: 0x%010llx, pa: 0x%010llx] "
+                  "pgsz=%-3dKb as=%-2d "
+                  "flags=0x%x apt=%s (reused)",
+                  u64_hi32(mapped_buffer->addr), u64_lo32(mapped_buffer->addr),
+                  os_buf->dmabuf->size,
+                  (u64)sg_dma_address(mapped_buffer->os_priv.sgt->sgl),
+                  (u64)sg_phys(mapped_buffer->os_priv.sgt->sgl),
+                  vm->gmmu_page_sizes[mapped_buffer->pgsz_idx] >> 10,
+                  vm_aspace_id(vm),
+                  mapped_buffer->flags,
+                  nvgpu_aperture_str(g,
+                                     gk20a_dmabuf_aperture(g, os_buf->dmabuf)));
+
+        return mapped_buffer;
+}
+
+int nvgpu_vm_map_linux(struct vm_gk20a *vm,
+                       struct dma_buf *dmabuf,
+                       u64 map_addr,
+                       u32 flags,
+                       u32 page_size,
+                       s16 compr_kind,
+                       s16 incompr_kind,
+                       int rw_flag,
+                       u64 buffer_offset,
+                       u64 mapping_size,
+                       struct vm_gk20a_mapping_batch *batch,
+                       u64 *gpu_va)
+{
+        struct gk20a *g = gk20a_from_vm(vm);
+        struct device *dev = dev_from_gk20a(g);
+        struct nvgpu_os_buffer os_buf;
+        struct sg_table *sgt;
+        struct nvgpu_sgt *nvgpu_sgt = NULL;
+        struct nvgpu_mapped_buf *mapped_buffer = NULL;
+        struct dma_buf_attachment *attachment;
+        int err = 0;
+
+        sgt = gk20a_mm_pin(dev, dmabuf, &attachment);
+        if (IS_ERR(sgt)) {
+                nvgpu_warn(g, "Failed to pin dma_buf!");
+                return PTR_ERR(sgt);
+        }
+        os_buf.dmabuf = dmabuf;
+        os_buf.attachment = attachment;
+        os_buf.dev = dev;
+
+        if (gk20a_dmabuf_aperture(g, dmabuf) == APERTURE_INVALID) {
+                err = -EINVAL;
+                goto clean_up;
+        }
+
+        nvgpu_sgt = nvgpu_linux_sgt_create(g, sgt);
+        if (!nvgpu_sgt) {
+                err = -ENOMEM;
+                goto clean_up;
+        }
+
+        mapped_buffer = nvgpu_vm_map(vm,
+                                     &os_buf,
+                                     nvgpu_sgt,
+                                     map_addr,
+                                     mapping_size,
+                                     buffer_offset,
+                                     rw_flag,
+                                     flags,
+                                     compr_kind,
+                                     incompr_kind,
+                                     batch,
+                                     gk20a_dmabuf_aperture(g, dmabuf));
+
+        nvgpu_sgt_free(g, nvgpu_sgt);
+
+        if (IS_ERR(mapped_buffer)) {
+                err = PTR_ERR(mapped_buffer);
+                goto clean_up;
+        }
+
+        mapped_buffer->os_priv.dmabuf = dmabuf;
+        mapped_buffer->os_priv.attachment = attachment;
+        mapped_buffer->os_priv.sgt    = sgt;
+
+        *gpu_va = mapped_buffer->addr;
+        return 0;
+
+clean_up:
+        gk20a_mm_unpin(dev, dmabuf, attachment, sgt);
+
+        return err;
+}
+
+int nvgpu_vm_map_buffer(struct vm_gk20a *vm,
+                        int dmabuf_fd,
+                        u64 *map_addr,
+                        u32 flags, /*NVGPU_AS_MAP_BUFFER_FLAGS_*/
+                        u32 page_size,
+                        s16 compr_kind,
+                        s16 incompr_kind,
+                        u64 buffer_offset,
+                        u64 mapping_size,
+                        struct vm_gk20a_mapping_batch *batch)
+{
+        struct gk20a *g = gk20a_from_vm(vm);
+        struct dma_buf *dmabuf;
+        u64 ret_va;
+        int err = 0;
+
+        /* get ref to the mem handle (released on unmap_locked) */
+        dmabuf = dma_buf_get(dmabuf_fd);
+        if (IS_ERR(dmabuf)) {
+                nvgpu_warn(g, "%s: fd %d is not a dmabuf",
+                           __func__, dmabuf_fd);
+                return PTR_ERR(dmabuf);
+        }
+
+        /*
+         * For regular maps we do not accept either an input address or a
+         * buffer_offset.
+         */
+        if (!(flags & NVGPU_AS_MAP_BUFFER_FLAGS_FIXED_OFFSET) &&
+            (buffer_offset || *map_addr)) {
+                nvgpu_err(g,
+                          "Regular map with addr/buf offset is not supported!");
+                dma_buf_put(dmabuf);
+                return -EINVAL;
+        }
+
+        /*
+         * Map size is always buffer size for non fixed mappings. As such map
+         * size should be left as zero by userspace for non-fixed maps.
+         */
+        if (mapping_size && !(flags & NVGPU_AS_MAP_BUFFER_FLAGS_FIXED_OFFSET)) {
+                nvgpu_err(g, "map_size && non-fixed-mapping!");
+                dma_buf_put(dmabuf);
+                return -EINVAL;
+        }
+
+        /* verify that we're not overflowing the buffer, i.e.
+         * (buffer_offset + mapping_size) > dmabuf->size.
+         *
+         * Since buffer_offset + mapping_size could overflow, first check
+         * that mapping size < dmabuf_size, at which point we can subtract
+         * mapping_size from both sides for the final comparison.
+         */
+        if ((mapping_size > dmabuf->size) ||
+                        (buffer_offset > (dmabuf->size - mapping_size))) {
+                nvgpu_err(g,
+                          "buf size %llx < (offset(%llx) + map_size(%llx))",
+                          (u64)dmabuf->size, buffer_offset, mapping_size);
+                dma_buf_put(dmabuf);
+                return -EINVAL;
+        }
+
+        err = gk20a_dmabuf_alloc_drvdata(dmabuf, dev_from_vm(vm));
+        if (err) {
+                dma_buf_put(dmabuf);
+                return err;
+        }
+
+        err = nvgpu_vm_map_linux(vm, dmabuf, *map_addr,
+                                 nvgpu_vm_translate_linux_flags(g, flags),
+                                 page_size,
+                                 compr_kind, incompr_kind,
+                                 gk20a_mem_flag_none,
+                                 buffer_offset,
+                                 mapping_size,
+                                 batch,
+                                 &ret_va);
+
+        if (!err)
+                *map_addr = ret_va;
+        else
+                dma_buf_put(dmabuf);
+
+        return err;
+}
+
+/*
+ * This is the function call-back for freeing OS specific components of an
+ * nvgpu_mapped_buf. This should most likely never be called outside of the
+ * core MM framework!
+ *
+ * Note: the VM lock will be held.
+ */
+void nvgpu_vm_unmap_system(struct nvgpu_mapped_buf *mapped_buffer)
+{
+        struct vm_gk20a *vm = mapped_buffer->vm;
+
+        gk20a_mm_unpin(dev_from_vm(vm), mapped_buffer->os_priv.dmabuf,
+                       mapped_buffer->os_priv.attachment,
+                       mapped_buffer->os_priv.sgt);
+
+        dma_buf_put(mapped_buffer->os_priv.dmabuf);
+}
diff --git a/include/os/linux/vpr.c b/include/os/linux/vpr.c
new file mode 100644
index 0000000..3a98125
--- /dev/null
+++ b/include/os/linux/vpr.c
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <nvgpu/vpr.h>
+
+#include <linux/init.h>
+#include <linux/platform/tegra/common.h>
+
+bool nvgpu_is_vpr_resize_enabled(void)
+{
+        return tegra_is_vpr_resize_supported();
+}
diff --git a/include/os/posix/bitmap.c b/include/os/posix/bitmap.c
new file mode 100644
index 0000000..99ba62c
--- /dev/null
+++ b/include/os/posix/bitmap.c
@@ -0,0 +1,227 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <nvgpu/posix/bitops.h>
+#include <nvgpu/posix/atomic.h>
+
+#define BIT_MASK(nr)    (1UL << ((nr) % BITS_PER_LONG))
+#define BIT_WORD(nr)    ((nr) / BITS_PER_LONG)
+
+unsigned long __nvgpu_posix_ffs(unsigned long word)
+{
+        return (__builtin_ffsl(word) - 1) &
+                ((sizeof(unsigned long) * 8UL) - 1UL);
+}
+
+unsigned long __nvgpu_posix_fls(unsigned long word)
+{
+        unsigned long ret;
+
+        if (word == 0UL) {
+                /* __builtin_clzl() below is undefined for 0, so we have
+                 * to handle that as a special case.
+                 */
+                ret = 0UL;
+        } else {
+                ret = (sizeof(unsigned long) * 8UL) - __builtin_clzl(word);
+        }
+
+        return ret;
+}
+
+static unsigned long __find_next_bit(const unsigned long *addr,
+                                     unsigned long n,
+                                     unsigned long start,
+                                     bool invert)
+{
+        unsigned long idx;
+        unsigned long w;
+        unsigned long start_mask;
+
+        /*
+         * We make a mask we can XOR into the word so that we can invert the
+         * word without requiring a branch. I.e instead of doing:
+         *
+         *   w = invert ? ~addr[idx] : addr[idx]
+         *
+         * We can do:
+         *
+         *   w = addr[idx] ^= invert_mask
+         *
+         * This saves us a branch every iteration through the loop. Now we can
+         * always just look for 1s.
+         */
+        unsigned long invert_mask = invert ? ~0UL : 0UL;
+
+        if (start >= n)
+                return n;
+
+        start_mask = ~0UL << (start & (BITS_PER_LONG - 1));
+
+        idx = start / BITS_PER_LONG;
+        w = (addr[idx] ^ invert_mask) & start_mask;
+
+        start = round_up(start, BITS_PER_LONG);
+
+        /*
+         * Find the first non-zero word taking into account start and
+         * invert.
+         */
+        while (!w) {
+                idx++;
+                start += BITS_PER_LONG;
+
+                w = addr[idx] ^ invert_mask;
+        }
+
+        return min(n, ffs(w) + idx * BITS_PER_LONG);
+}
+
+unsigned long find_first_bit(const unsigned long *addr, unsigned long size)
+{
+        return __find_next_bit(addr, size, 0, false);
+}
+
+unsigned long find_first_zero_bit(const unsigned long *addr, unsigned long size)
+{
+        return __find_next_bit(addr, size, 0, true);
+}
+
+unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
+                            unsigned long offset)
+{
+        return __find_next_bit(addr, size, offset, false);
+}
+
+static unsigned long find_next_zero_bit(const unsigned long *addr,
+                                        unsigned long size,
+                                        unsigned long offset)
+{
+        return __find_next_bit(addr, size, offset, true);
+}
+
+void bitmap_set(unsigned long *map, unsigned int start, int len)
+{
+        unsigned int end = start + len;
+
+        /*
+         * Super slow naive implementation. But speed isn't what matters here.
+         */
+        while (start < end)
+                set_bit(start++, map);
+}
+
+void bitmap_clear(unsigned long *map, unsigned int start, int len)
+{
+        unsigned int end = start + len;
+
+        while (start < end)
+                clear_bit(start++, map);
+}
+
+/*
+ * This is essentially a find-first-fit allocator: this searches a bitmap for
+ * the first space that is large enough to satisfy the requested size of bits.
+ * That means that this is not a vary smart allocator. But it is fast relative
+ * to an allocator that goes looking for an optimal location.
+ */
+unsigned long bitmap_find_next_zero_area_off(unsigned long *map,
+                                             unsigned long size,
+                                             unsigned long start,
+                                             unsigned int nr,
+                                             unsigned long align_mask,
+                                             unsigned long align_offset)
+{
+        unsigned long offs;
+
+        while (start + nr <= size) {
+                start = find_next_zero_bit(map, size, start);
+
+                start = ALIGN_MASK(start + align_offset, align_mask) -
+                        align_offset;
+
+                /*
+                 * Not enough space left to satisfy the requested area.
+                 */
+                if ((start + nr) > size)
+                        return size;
+
+                offs = find_next_bit(map, size, start);
+
+                if ((offs - start) >= nr)
+                        return start;
+
+                start = offs + 1;
+        }
+
+        return size;
+}
+
+unsigned long bitmap_find_next_zero_area(unsigned long *map,
+                                         unsigned long size,
+                                         unsigned long start,
+                                         unsigned int nr,
+                                         unsigned long align_mask)
+{
+        return bitmap_find_next_zero_area_off(map, size, start, nr,
+                                              align_mask, 0);
+}
+
+bool test_bit(int nr, const volatile unsigned long *addr)
+{
+        return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
+}
+
+bool test_and_set_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned long mask = BIT_MASK(nr);
+        volatile unsigned long *p = addr + BIT_WORD(nr);
+
+        return !!(__sync_fetch_and_or(p, mask) & mask);
+}
+
+bool test_and_clear_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned long mask = BIT_MASK(nr);
+        unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+
+        return !!(__sync_fetch_and_and(p, ~mask) & mask);
+}
+
+void set_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned long mask = BIT_MASK(nr);
+        unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+
+        __atomic_or(p, mask);
+}
+
+void clear_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned long mask = BIT_MASK(nr);
+        unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+
+        __atomic_and(p, ~mask);
+}
diff --git a/include/os/posix/bug.c b/include/os/posix/bug.c
new file mode 100644
index 0000000..64f4a6f
--- /dev/null
+++ b/include/os/posix/bug.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/log.h>
+
+#include <nvgpu/posix/bug.h>
+
+__attribute__ ((noreturn))
+static void __hang(void)
+{
+        nvgpu_err(NULL, "Hanging!");
+
+        while (1)
+                ;
+}
+
+static void __dump_stack(unsigned int skip_frames)
+{
+        return;
+}
+
+void dump_stack(void)
+{
+        __dump_stack(0);
+}
+
+/*
+ * Ahhh! A bug!
+ */
+void __bug(const char *fmt, ...)
+{
+        nvgpu_err(NULL, "BUG detected!");
+
+        __hang();
+}
+
+bool __warn(bool cond, const char *fmt, ...)
+{
+        if (!cond)
+                goto done;
+
+        nvgpu_warn(NULL, "WARNING detected!");
+
+        dump_stack();
+
+done:
+        return cond;
+}
diff --git a/include/os/posix/clk_arb.c b/include/os/posix/clk_arb.c
new file mode 100644
index 0000000..fcba0a2
--- /dev/null
+++ b/include/os/posix/clk_arb.c
@@ -0,0 +1,198 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/list.h>
+#include <nvgpu/clk_arb.h>
+
+/**
+ * Stub imlementation of the clk_arb code. Yikes. Much of this probably could be
+ * commonized if one were to think through the implementation but that is
+ * probably weeks of work at a minimum.
+ *
+ * So for POSIX it will be stubbed.
+ */
+
+int nvgpu_clk_arb_init_arbiter(struct gk20a *g)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_get_arbiter_clk_range(struct gk20a *g, u32 api_domain,
+                                        u16 *min_mhz, u16 *max_mhz)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_update_vf_table(struct nvgpu_clk_arb *arb)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_worker_init(struct gk20a *g)
+{
+        return -ENOSYS;
+}
+
+bool nvgpu_clk_arb_has_active_req(struct gk20a *g)
+{
+        return false;
+}
+
+int nvgpu_clk_arb_get_arbiter_actual_mhz(struct gk20a *g,
+                                         u32 api_domain, u16 *actual_mhz)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_get_arbiter_effective_mhz(struct gk20a *g,
+                                            u32 api_domain, u16 *effective_mhz)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_get_arbiter_clk_f_points(struct gk20a *g,
+                                           u32 api_domain,
+                                           u32 *max_points, u16 *fpoints)
+{
+        return -ENOSYS;
+}
+
+u32 nvgpu_clk_arb_get_arbiter_clk_domains(struct gk20a *g)
+{
+        return 0;
+}
+
+bool nvgpu_clk_arb_is_valid_domain(struct gk20a *g, u32 api_domain)
+{
+        return false;
+}
+
+void nvgpu_clk_arb_cleanup_arbiter(struct gk20a *g)
+{
+}
+
+int nvgpu_clk_arb_install_session_fd(struct gk20a *g,
+                                     struct nvgpu_clk_session *session)
+{
+        return -ENOSYS;
+}
+
+
+int nvgpu_clk_arb_init_session(struct gk20a *g,
+                               struct nvgpu_clk_session **_session)
+{
+        return -ENOSYS;
+}
+
+void nvgpu_clk_arb_release_session(struct gk20a *g,
+                                   struct nvgpu_clk_session *session)
+{
+}
+
+int nvgpu_clk_arb_commit_request_fd(struct gk20a *g,
+                                    struct nvgpu_clk_session *session,
+                                    int request_fd)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_set_session_target_mhz(struct nvgpu_clk_session *session,
+                                         int fd, u32 api_domain, u16 target_mhz)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_get_session_target_mhz(struct nvgpu_clk_session *session,
+                                         u32 api_domain, u16 *target_mhz)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_install_event_fd(struct gk20a *g,
+                                   struct nvgpu_clk_session *session,
+                                   int *event_fd, u32 alarm_mask)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_install_request_fd(struct gk20a *g,
+                                     struct nvgpu_clk_session *session,
+                                     int *event_fd)
+{
+        return -ENOSYS;
+}
+
+u32 nvgpu_clk_arb_notify(struct nvgpu_clk_dev *dev,
+                                struct nvgpu_clk_arb_target *target,
+                                u32 alarm)
+{
+        return 0;
+}
+
+void nvgpu_clk_arb_free_fd(struct nvgpu_ref *refcount)
+{
+}
+
+void nvgpu_clk_arb_schedule_vf_table_update(struct gk20a *g)
+{
+}
+
+int nvgpu_clk_arb_get_current_pstate(struct gk20a *g)
+{
+        return -ENOSYS;
+}
+
+void nvgpu_clk_arb_pstate_change_lock(struct gk20a *g, bool lock)
+{
+}
+
+void nvgpu_clk_arb_send_thermal_alarm(struct gk20a *g)
+{
+}
+
+void nvgpu_clk_arb_schedule_alarm(struct gk20a *g, u32 alarm)
+{
+}
+
+void nvgpu_clk_arb_set_global_alarm(struct gk20a *g, u32 alarm)
+{
+}
+
+void nvgpu_clk_arb_clear_global_alarm(struct gk20a *g, u32 alarm)
+{
+}
+
+void nvgpu_clk_arb_event_post_event(struct nvgpu_clk_dev *dev)
+{
+}
+
+void nvgpu_clk_arb_worker_enqueue(struct gk20a *g,
+                struct nvgpu_clk_arb_work_item *work_item)
+{
+}
+
+int nvgpu_clk_notification_queue_alloc(struct gk20a *g,
+                                struct nvgpu_clk_notification_queue *queue,
+                                size_t events_number)
+{
+        return -ENOSYS;
+}
diff --git a/include/os/posix/cond.c b/include/os/posix/cond.c
new file mode 100644
index 0000000..ca8a2c4
--- /dev/null
+++ b/include/os/posix/cond.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/cond.h>
+
+#include <nvgpu/posix/cond.h>
+
+int nvgpu_cond_init(struct nvgpu_cond *cond)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_cond_signal(struct nvgpu_cond *cond)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_cond_signal_interruptible(struct nvgpu_cond *cond)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_cond_broadcast(struct nvgpu_cond *cond)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_cond_broadcast_interruptible(struct nvgpu_cond *cond)
+{
+        return -ENOSYS;
+}
+
+void nvgpu_cond_destroy(struct nvgpu_cond *cond)
+{
+
+}
diff --git a/include/os/posix/error_notifier.c b/include/os/posix/error_notifier.c
new file mode 100644
index 0000000..50b4f25
--- /dev/null
+++ b/include/os/posix/error_notifier.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/error_notifier.h>
+
+void nvgpu_set_error_notifier_locked(struct channel_gk20a *ch, u32 error)
+{
+}
+
+void nvgpu_set_error_notifier(struct channel_gk20a *ch, u32 error)
+{
+}
+
+void nvgpu_set_error_notifier_if_empty(struct channel_gk20a *ch, u32 error)
+{
+}
+
+bool nvgpu_is_error_notifier_set(struct channel_gk20a *ch, u32 error_notifier)
+{
+        return false;
+}
diff --git a/include/os/posix/firmware.c b/include/os/posix/firmware.c
new file mode 100644
index 0000000..aedfef9
--- /dev/null
+++ b/include/os/posix/firmware.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/firmware.h>
+
+struct nvgpu_firmware *nvgpu_request_firmware(struct gk20a *g,
+                                              const char *fw_name,
+                                              int flags)
+{
+        return NULL;
+}
+
+void nvgpu_release_firmware(struct gk20a *g, struct nvgpu_firmware *fw)
+{
+        /* Noop. */
+}
diff --git a/include/os/posix/fuse.c b/include/os/posix/fuse.c
new file mode 100644
index 0000000..09ec36d
--- /dev/null
+++ b/include/os/posix/fuse.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/fuse.h>
+
+int nvgpu_tegra_get_gpu_speedo_id(struct gk20a *g)
+{
+        return 0;
+}
+
+void nvgpu_tegra_fuse_write_bypass(struct gk20a *g, u32 val)
+{
+}
+
+void nvgpu_tegra_fuse_write_access_sw(struct gk20a *g, u32 val)
+{
+}
+
+void nvgpu_tegra_fuse_write_opt_gpu_tpc0_disable(struct gk20a *g, u32 val)
+{
+}
+
+void nvgpu_tegra_fuse_write_opt_gpu_tpc1_disable(struct gk20a *g, u32 val)
+{
+}
+
+int nvgpu_tegra_fuse_read_gcplex_config_fuse(struct gk20a *g, u32 *val)
+{
+        return -ENODEV;
+}
+
+int nvgpu_tegra_fuse_read_reserved_calib(struct gk20a *g, u32 *val)
+{
+        return -ENODEV;
+}
diff --git a/include/os/posix/io.c b/include/os/posix/io.c
new file mode 100644
index 0000000..8369e73
--- /dev/null
+++ b/include/os/posix/io.c
@@ -0,0 +1,371 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/io.h>
+#include <nvgpu/io_usermode.h>
+#include <nvgpu/bug.h>
+
+#include <nvgpu/posix/io.h>
+
+#include "os_posix.h"
+
+
+/*
+ * This function sets the IO callbacks to the passed set of callbacks. It
+ * returns the value of the old IO callback struct pointer. This function
+ * cannot fail.
+ *
+ * This is expected to be called from modules to set up their IO interaction.
+ */
+struct nvgpu_posix_io_callbacks *nvgpu_posix_register_io(
+        struct gk20a *g,
+        struct nvgpu_posix_io_callbacks *io_callbacks)
+{
+        struct nvgpu_os_posix *p = nvgpu_os_posix_from_gk20a(g);
+        struct nvgpu_posix_io_callbacks *old_io = p->callbacks;
+
+        p->callbacks = io_callbacks;
+
+        return old_io;
+}
+
+void nvgpu_writel(struct gk20a *g, u32 r, u32 v)
+{
+        struct nvgpu_posix_io_callbacks *callbacks =
+                nvgpu_os_posix_from_gk20a(g)->callbacks;
+
+        struct nvgpu_reg_access access = {
+                .addr = r,
+                .value = v
+        };
+
+        if (callbacks == NULL || callbacks->writel == NULL) {
+                BUG();
+        }
+
+        callbacks->writel(g, &access);
+}
+
+void nvgpu_writel_relaxed(struct gk20a *g, u32 r, u32 v)
+{
+        BUG();
+}
+
+u32 nvgpu_readl(struct gk20a *g, u32 r)
+{
+        struct nvgpu_posix_io_callbacks *callbacks =
+                nvgpu_os_posix_from_gk20a(g)->callbacks;
+
+        struct nvgpu_reg_access access = {
+                .addr = r,
+                .value = 0L
+        };
+
+        if (callbacks == NULL || callbacks->readl == NULL) {
+                BUG();
+        }
+
+        callbacks->readl(g, &access);
+
+        return access.value;
+}
+
+void nvgpu_writel_loop(struct gk20a *g, u32 r, u32 v)
+{
+        BUG();
+}
+
+u32 __nvgpu_readl(struct gk20a *g, u32 r)
+{
+        struct nvgpu_posix_io_callbacks *callbacks =
+                nvgpu_os_posix_from_gk20a(g)->callbacks;
+
+        struct nvgpu_reg_access access = {
+                .addr = r,
+                .value = 0L
+        };
+
+        if (callbacks == NULL || callbacks->__readl == NULL) {
+                BUG();
+        }
+
+        callbacks->__readl(g, &access);
+
+        return access.value;
+}
+
+void nvgpu_bar1_writel(struct gk20a *g, u32 b, u32 v)
+{
+        struct nvgpu_posix_io_callbacks *callbacks =
+                nvgpu_os_posix_from_gk20a(g)->callbacks;
+
+        struct nvgpu_reg_access access = {
+                .addr = b,
+                .value = v
+        };
+
+        if (callbacks == NULL || callbacks->bar1_writel == NULL) {
+                BUG();
+        }
+
+        callbacks->bar1_writel(g, &access);
+}
+
+u32 nvgpu_bar1_readl(struct gk20a *g, u32 b)
+{
+        struct nvgpu_posix_io_callbacks *callbacks =
+                nvgpu_os_posix_from_gk20a(g)->callbacks;
+
+        struct nvgpu_reg_access access = {
+                .addr = b,
+                .value = 0L
+        };
+
+        if (callbacks == NULL || callbacks->bar1_readl == NULL) {
+                BUG();
+        }
+
+        callbacks->bar1_readl(g, &access);
+
+        return access.value;
+}
+
+void nvgpu_usermode_writel(struct gk20a *g, u32 r, u32 v)
+{
+        struct nvgpu_posix_io_callbacks *callbacks =
+                nvgpu_os_posix_from_gk20a(g)->callbacks;
+
+        struct nvgpu_reg_access access = {
+                .addr = r,
+                .value = v
+        };
+
+        if (callbacks == NULL || callbacks->usermode_writel == NULL) {
+                BUG();
+        }
+
+        callbacks->usermode_writel(g, &access);
+}
+
+bool nvgpu_io_exists(struct gk20a *g)
+{
+        return false;
+}
+
+bool nvgpu_io_valid_reg(struct gk20a *g, u32 r)
+{
+        return false;
+}
+
+void nvgpu_posix_io_init_reg_space(struct gk20a *g)
+{
+        struct nvgpu_os_posix *p = nvgpu_os_posix_from_gk20a(g);
+
+        p->recording = false;
+        p->error_code = 0;
+        nvgpu_init_list_node(&p->reg_space_head);
+        nvgpu_init_list_node(&p->recorder_head);
+}
+
+int nvgpu_posix_io_get_error_code(struct gk20a *g)
+{
+        struct nvgpu_os_posix *p = nvgpu_os_posix_from_gk20a(g);
+
+        return p->error_code;
+}
+
+void nvgpu_posix_io_reset_error_code(struct gk20a *g)
+{
+        struct nvgpu_os_posix *p = nvgpu_os_posix_from_gk20a(g);
+
+        p->error_code = 0;
+}
+
+/*
+ * Add a new register space to the list of spaces, defined by a base
+ * address and a size.
+ */
+int nvgpu_posix_io_add_reg_space(struct gk20a *g, u32 base, u32 size)
+{
+        struct nvgpu_os_posix *p = nvgpu_os_posix_from_gk20a(g);
+        struct nvgpu_posix_io_reg_space *new_reg_space =
+                nvgpu_kzalloc(g, sizeof(struct nvgpu_posix_io_reg_space));
+
+        if (new_reg_space == NULL) {
+                return -ENOMEM;
+        }
+
+        new_reg_space->base = base;
+        new_reg_space->size = size;
+
+        new_reg_space->data = nvgpu_vzalloc(g, size);
+        if (new_reg_space->data == NULL) {
+                return -ENOMEM;
+        }
+
+        nvgpu_list_add_tail(&new_reg_space->link, &p->reg_space_head);
+        return 0;
+}
+
+void nvgpu_posix_io_delete_reg_space(struct gk20a *g, u32 base)
+{
+        struct nvgpu_posix_io_reg_space *reg_space =
+                nvgpu_posix_io_get_reg_space(g, base);
+        if (reg_space == NULL) {
+                /* Invalid space, or already de-allocated */
+                return;
+        }
+        nvgpu_list_del(&reg_space->link);
+        nvgpu_vfree(g, reg_space->data);
+        nvgpu_kfree(g, reg_space);
+}
+
+/*
+ * Lookup a register space from a given address. If no register space is found
+ * this is a bug similar to a translation fault.
+ */
+struct nvgpu_posix_io_reg_space *nvgpu_posix_io_get_reg_space(struct gk20a *g,
+                u32 addr)
+{
+        struct nvgpu_os_posix *p = nvgpu_os_posix_from_gk20a(g);
+        struct nvgpu_posix_io_reg_space *reg_space;
+
+        nvgpu_list_for_each_entry(reg_space, &p->reg_space_head,
+                        nvgpu_posix_io_reg_space, link) {
+                u32 offset = addr - reg_space->base;
+
+                if ((addr >= reg_space->base) && (offset <= reg_space->size)) {
+                        return reg_space;
+                }
+        }
+        p->error_code = -EFAULT;
+        nvgpu_err(g, "ABORT for address 0x%x", addr);
+        return NULL;
+}
+
+void nvgpu_posix_io_writel_reg_space(struct gk20a *g, u32 addr, u32 data)
+{
+        struct nvgpu_posix_io_reg_space *space =
+                        nvgpu_posix_io_get_reg_space(g, addr);
+
+        if (space != NULL) {
+                u32 offset = (addr - space->base) / ((u32) sizeof(u32));
+
+                *(space->data + offset) = data;
+        }
+}
+
+u32 nvgpu_posix_io_readl_reg_space(struct gk20a *g, u32 addr)
+{
+        struct nvgpu_posix_io_reg_space *space =
+                        nvgpu_posix_io_get_reg_space(g, addr);
+
+        if (space != NULL) {
+                u32 offset = (addr - space->base) / ((u32) sizeof(u32));
+
+                return *(space->data + offset);
+        } else {
+                return 0;
+        }
+}
+
+/*
+ * Start recording register writes. If this function is called again,
+ * it will free all previously recorded events.
+ */
+void nvgpu_posix_io_start_recorder(struct gk20a *g)
+{
+        struct nvgpu_os_posix *p = nvgpu_os_posix_from_gk20a(g);
+        struct nvgpu_posix_io_reg_access *ptr;
+
+        /* If list already has events, delete them all */
+        if (p->recording == true) {
+                while (!nvgpu_list_empty(&p->recorder_head)) {
+                        ptr = nvgpu_list_first_entry(&p->recorder_head,
+                                nvgpu_posix_io_reg_access, link);
+                        nvgpu_list_del(&ptr->link);
+                        nvgpu_kfree(g, ptr);
+                }
+        }
+        p->recording = true;
+}
+
+void nvgpu_posix_io_record_access(struct gk20a *g,
+                struct nvgpu_reg_access *access)
+{
+        struct nvgpu_os_posix *p = nvgpu_os_posix_from_gk20a(g);
+
+        if (p->recording == true) {
+                struct nvgpu_posix_io_reg_access *new_event = nvgpu_kzalloc(g,
+                        sizeof(struct nvgpu_posix_io_reg_access));
+                (void) memcpy(&(new_event->access), access,
+                        sizeof(struct nvgpu_reg_access));
+                nvgpu_list_add_tail(&new_event->link, &p->recorder_head);
+        }
+}
+
+/*
+ * Take an array of accesses and compare to the recorded sequence. Returns true
+ * if the array matches the recorded sequence.
+ * If strict mode is false, this function allows extra accesses to be present
+ * in the recording.
+ */
+bool nvgpu_posix_io_check_sequence(struct gk20a *g,
+                struct nvgpu_reg_access *sequence, u32 size, bool strict)
+{
+        struct nvgpu_os_posix *p = nvgpu_os_posix_from_gk20a(g);
+        struct nvgpu_posix_io_reg_access *ptr;
+        u32 i = 0;
+
+        if (p->recording == false) {
+                return false;
+        }
+
+        nvgpu_list_for_each_entry(ptr, &p->recorder_head,
+                        nvgpu_posix_io_reg_access, link) {
+                if ((sequence[i].addr == ptr->access.addr) &&
+                        (sequence[i].value == ptr->access.value)) {
+                        i++;
+                } else {
+                        if (strict == true) {
+                                return false;
+                        }
+                }
+        }
+
+        if (i != size) {
+                /* Either missing or too many accesses */
+                return false;
+        }
+
+        if (&ptr->link == &p->recorder_head) {
+                /* Identical match */
+                return true;
+        }
+
+        /* Not an identical match */
+        if (strict) {
+                return false;
+        } else {
+                return true;
+        }
+}
diff --git a/include/os/posix/kmem.c b/include/os/posix/kmem.c
new file mode 100644
index 0000000..5fe0aeb
--- /dev/null
+++ b/include/os/posix/kmem.c
@@ -0,0 +1,134 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+
+#include <nvgpu/bug.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/types.h>
+
+#include <nvgpu/posix/kmem.h>
+
+struct nvgpu_kmem_cache {
+        size_t alloc_size;
+};
+
+/*
+ * kmem cache emulation: basically just do a regular malloc(). This is slower
+ * but should not affect a user of kmem cache in the slightest bit.
+ */
+struct nvgpu_kmem_cache *nvgpu_kmem_cache_create(struct gk20a *g, size_t size)
+{
+        struct nvgpu_kmem_cache *cache =
+                malloc(sizeof(struct nvgpu_kmem_cache));
+
+        if (cache != NULL)
+                return NULL;
+
+        cache->alloc_size = size;
+
+        return cache;
+}
+
+void nvgpu_kmem_cache_destroy(struct nvgpu_kmem_cache *cache)
+{
+        free(cache);
+}
+
+void *nvgpu_kmem_cache_alloc(struct nvgpu_kmem_cache *cache)
+{
+        return malloc(cache->alloc_size);
+}
+
+void nvgpu_kmem_cache_free(struct nvgpu_kmem_cache *cache, void *ptr)
+{
+        free(ptr);
+}
+
+void *__nvgpu_kmalloc(struct gk20a *g, size_t size, void *ip)
+{
+        return malloc(size);
+}
+
+void *__nvgpu_kzalloc(struct gk20a *g, size_t size, void *ip)
+{
+        return calloc(1, size);
+}
+
+void *__nvgpu_kcalloc(struct gk20a *g, size_t n, size_t size, void *ip)
+{
+        /*
+         * calloc() implicitly zeros mem. So calloc a single member size bytes
+         * long.
+         */
+        return calloc(n, size);
+}
+
+void __nvgpu_kfree(struct gk20a *g, void *addr)
+{
+        free(addr);
+}
+
+/*
+ * The concept of vmalloc() does not exist in userspace.
+ */
+void *__nvgpu_vmalloc(struct gk20a *g, unsigned long size, void *ip)
+{
+        return __nvgpu_kmalloc(g, size, ip);
+}
+
+void *__nvgpu_vzalloc(struct gk20a *g, unsigned long size, void *ip)
+{
+        return __nvgpu_kzalloc(g, size, ip);
+}
+
+void __nvgpu_vfree(struct gk20a *g, void *addr)
+{
+        __nvgpu_kfree(g, addr);
+}
+
+void *__nvgpu_big_alloc(struct gk20a *g, size_t size, bool clear)
+{
+        /*
+         * Since in userspace vmalloc() == kmalloc() == malloc() we can just
+         * reuse k[zm]alloc() for this.
+         */
+        return clear ?
+                __nvgpu_kzalloc(g, size, _NVGPU_GET_IP_) :
+                __nvgpu_kmalloc(g, size, _NVGPU_GET_IP_);
+}
+
+void nvgpu_big_free(struct gk20a *g, void *p)
+{
+        __nvgpu_kfree(g, p);
+}
+
+int nvgpu_kmem_init(struct gk20a *g)
+{
+        /* Nothing to init at the moment. */
+        return 0;
+}
+
+void nvgpu_kmem_fini(struct gk20a *g, int flags)
+{
+
+}
diff --git a/include/os/posix/lock.c b/include/os/posix/lock.c
new file mode 100644
index 0000000..bca0f04
--- /dev/null
+++ b/include/os/posix/lock.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/lock.h>
+#include <nvgpu/posix/lock.h>
+
+int nvgpu_mutex_init(struct nvgpu_mutex *mutex)
+{
+        return pthread_mutex_init(&mutex->lock.mutex, NULL);
+}
+
+void nvgpu_mutex_acquire(struct nvgpu_mutex *mutex)
+{
+        __nvgpu_posix_lock_acquire(&mutex->lock);
+}
+
+void nvgpu_mutex_release(struct nvgpu_mutex *mutex)
+{
+        __nvgpu_posix_lock_release(&mutex->lock);
+}
+
+int nvgpu_mutex_tryacquire(struct nvgpu_mutex *mutex)
+{
+        return __nvgpu_posix_lock_try_acquire(&mutex->lock);
+}
+
+void nvgpu_mutex_destroy(struct nvgpu_mutex *mutex)
+{
+        pthread_mutex_destroy(&mutex->lock.mutex);
+}
+
+void nvgpu_spinlock_init(struct nvgpu_spinlock *spinlock)
+{
+        pthread_mutex_init(&spinlock->lock.mutex, NULL);
+}
+
+void nvgpu_spinlock_acquire(struct nvgpu_spinlock *spinlock)
+{
+        __nvgpu_posix_lock_acquire(&spinlock->lock);
+}
+
+void nvgpu_spinlock_release(struct nvgpu_spinlock *spinlock)
+{
+        __nvgpu_posix_lock_release(&spinlock->lock);
+}
+
+void nvgpu_raw_spinlock_init(struct nvgpu_raw_spinlock *spinlock)
+{
+        pthread_mutex_init(&spinlock->lock.mutex, NULL);
+}
+
+void nvgpu_raw_spinlock_acquire(struct nvgpu_raw_spinlock *spinlock)
+{
+        __nvgpu_posix_lock_acquire(&spinlock->lock);
+}
+
+void nvgpu_raw_spinlock_release(struct nvgpu_raw_spinlock *spinlock)
+{
+        __nvgpu_posix_lock_release(&spinlock->lock);
+}
diff --git a/include/os/posix/log.c b/include/os/posix/log.c
new file mode 100644
index 0000000..35d2626
--- /dev/null
+++ b/include/os/posix/log.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/log.h>
+#include <nvgpu/types.h>
+
+#include <nvgpu/gk20a.h>
+
+/*
+ * Define a length for log buffers. This is the buffer that the 'fmt, ...' part
+ * of __nvgpu_do_log_print() prints into.
+ */
+#define LOG_BUFFER_LENGTH       160
+
+/*
+ * Keep this roughly the same as the kernel log format.
+ */
+#define LOG_FMT                 "nvgpu: %s %33s:%-4d [%-4s]  %s\n"
+
+u64 nvgpu_dbg_mask = NVGPU_DEFAULT_DBG_MASK;
+
+static const char *log_types[] = {
+        "ERR",
+        "WRN",
+        "DBG",
+        "INFO",
+};
+
+static inline const char *nvgpu_log_name(struct gk20a *g)
+{
+        return "gpu.USS";
+}
+
+static void __nvgpu_really_print_log(const char *gpu_name,
+                                     const char *func_name, int line,
+                                     enum nvgpu_log_type type, const char *log)
+{
+        const char *name = gpu_name ? gpu_name : "";
+        const char *log_type = log_types[type];
+
+        printf(LOG_FMT, name, func_name, line, log_type, log);
+}
+
+__attribute__((format (printf, 5, 6)))
+void __nvgpu_log_msg(struct gk20a *g, const char *func_name, int line,
+                     enum nvgpu_log_type type, const char *fmt, ...)
+{
+        char log[LOG_BUFFER_LENGTH];
+        va_list args;
+
+        va_start(args, fmt);
+        vsnprintf(log, LOG_BUFFER_LENGTH, fmt, args);
+        va_end(args);
+
+        __nvgpu_really_print_log(nvgpu_log_name(g),
+                                 func_name, line, type, log);
+}
+
+__attribute__((format (printf, 5, 6)))
+void __nvgpu_log_dbg(struct gk20a *g, u64 log_mask,
+                     const char *func_name, int line,
+                     const char *fmt, ...)
+{
+        char log[LOG_BUFFER_LENGTH];
+        va_list args;
+
+        if ((log_mask & g->log_mask) == 0)
+                return;
+
+        va_start(args, fmt);
+        vsnprintf(log, LOG_BUFFER_LENGTH, fmt, args);
+        va_end(args);
+
+        __nvgpu_really_print_log(nvgpu_log_name(g),
+                                 func_name, line, NVGPU_DEBUG, log);
+}
diff --git a/include/os/posix/nvgpu.c b/include/os/posix/nvgpu.c
new file mode 100644
index 0000000..e485ed7
--- /dev/null
+++ b/include/os/posix/nvgpu.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <pthread.h>
+
+#include <nvgpu/gk20a.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/types.h>
+#include <nvgpu/atomic.h>
+#include <nvgpu/nvgpu_common.h>
+#include <nvgpu/os_sched.h>
+#include <nvgpu/gk20a.h>
+
+#include <nvgpu/posix/probe.h>
+
+#include "os_posix.h"
+
+void nvgpu_wait_for_deferred_interrupts(struct gk20a *g)
+{
+        /*
+         * No interrupts in userspace so nothing to wait for.
+         */
+}
+
+int nvgpu_current_pid(struct gk20a *g)
+{
+        /*
+         * In the kernel this gets us the PID of the calling process for IOCTLs.
+         * But since we are in userspace this doesn't quite mean the same thing.
+         * This simply returns the PID of the currently running process.
+         */
+        return (int)getpid();
+}
+
+int nvgpu_current_tid(struct gk20a *g)
+{
+        /*
+         * In POSIX thread ID is not the same as a process ID. In Linux threads
+         * and processes are represented by the same thing, but userspace can't
+         * really rely on that.
+         *
+         * We can, however, get a pthread_t for a given thread. But this
+         * pthread_t need not have any relation to the underlying system's
+         * representation of "threads".
+         */
+        return (int)pthread_self();
+}
+
+void __nvgpu_print_current(struct gk20a *g, const char *func_name, int line,
+                void *ctx, enum nvgpu_log_type type)
+{
+        __nvgpu_log_msg(g, func_name, line, type,
+                        "Current process: (nvgpu userspace)");
+}
+
+/*
+ * Somewhat meaningless in userspace...
+ */
+void nvgpu_kernel_restart(void *cmd)
+{
+        BUG();
+}
+
+/*
+ * We have no runtime PM stuff in userspace so these are really just noops.
+ */
+void gk20a_busy_noresume(struct gk20a *g)
+{
+}
+
+void gk20a_idle_nosuspend(struct gk20a *g)
+{
+}
+
+bool gk20a_check_poweron(struct gk20a *g)
+{
+        return false;
+}
+
+int gk20a_busy(struct gk20a *g)
+{
+        nvgpu_atomic_inc(&g->usage_count);
+
+        return 0;
+}
+
+void gk20a_idle(struct gk20a *g)
+{
+        nvgpu_atomic_dec(&g->usage_count);
+}
+
+/*
+ * This function aims to initialize enough stuff to make unit testing worth
+ * while. There are several interfaces and APIs that rely on the struct gk20a's
+ * state in order to function: logging, for example, but there are many other
+ * things, too.
+ *
+ * Initialize as much of that as possible here. This is meant to be equivalent
+ * to the kernel space driver's probe function.
+ */
+struct gk20a *nvgpu_posix_probe(void)
+{
+        struct gk20a *g;
+        struct nvgpu_os_posix *p;
+        int err;
+
+        p = malloc(sizeof(*p));
+        if (p == NULL)
+                return NULL;
+
+        g = &p->g;
+
+        err = nvgpu_kmem_init(g);
+        if (err != 0)
+                goto fail;
+
+        return g;
+
+fail:
+        free(p);
+
+        return NULL;
+}
+
+void nvgpu_posix_cleanup(struct gk20a *g)
+{
+        nvgpu_kmem_fini(g, 0);
+}
diff --git a/include/os/posix/nvlink.c b/include/os/posix/nvlink.c
new file mode 100644
index 0000000..c830d6e
--- /dev/null
+++ b/include/os/posix/nvlink.c
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/nvlink.h>
+
+int nvgpu_nvlink_train(struct gk20a *g, u32 link_id, bool from_off)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_nvlink_enumerate(struct gk20a *g)
+{
+        return -ENOSYS;
+}
diff --git a/include/os/posix/os_posix.h b/include/os/posix/os_posix.h
new file mode 100644
index 0000000..d403ad5
--- /dev/null
+++ b/include/os/posix/os_posix.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __NVGPU_OS_POSIX_H__
+#define __NVGPU_OS_POSIX_H__
+
+#include <nvgpu/gk20a.h>
+
+struct nvgpu_posix_io_callbacks;
+
+struct nvgpu_os_posix {
+        struct gk20a g;
+
+
+        /*
+         * IO callbacks for handling the nvgpu IO accessors.
+         */
+        struct nvgpu_posix_io_callbacks *callbacks;
+
+        /*
+         * Memory-mapped register space for unit tests.
+         */
+        struct nvgpu_list_node reg_space_head;
+        int error_code;
+
+
+        /*
+         * List to record sequence of register writes.
+         */
+        struct nvgpu_list_node recorder_head;
+        bool recording;
+};
+
+static inline struct nvgpu_os_posix *nvgpu_os_posix_from_gk20a(struct gk20a *g)
+{
+        return container_of(g, struct nvgpu_os_posix, g);
+}
+
+#endif
diff --git a/include/os/posix/posix-channel.c b/include/os/posix/posix-channel.c
new file mode 100644
index 0000000..5e10b1e
--- /dev/null
+++ b/include/os/posix/posix-channel.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/channel.h>
+
+u32 nvgpu_get_gpfifo_entry_size(void)
+{
+        /*
+         * There is no struct nvgpu_gpfifo for us to use yet. But when it's
+         * defined in userspace this is how big it will be.
+         */
+        return 8;
+}
diff --git a/include/os/posix/posix-comptags.c b/include/os/posix/posix-comptags.c
new file mode 100644
index 0000000..a00246d
--- /dev/null
+++ b/include/os/posix/posix-comptags.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/bug.h>
+#include <nvgpu/comptags.h>
+
+#include <nvgpu/posix/vm.h>
+
+void gk20a_get_comptags(struct nvgpu_os_buffer *buf,
+                        struct gk20a_comptags *comptags)
+{
+}
+
+int gk20a_alloc_or_get_comptags(struct gk20a *g,
+                                struct nvgpu_os_buffer *buf,
+                                struct gk20a_comptag_allocator *allocator,
+                                struct gk20a_comptags *comptags)
+{
+        return -ENODEV;
+}
+
+bool gk20a_comptags_start_clear(struct nvgpu_os_buffer *buf)
+{
+        return false;
+}
+
+void gk20a_comptags_finish_clear(struct nvgpu_os_buffer *buf,
+                                 bool clear_successful)
+{
+}
diff --git a/include/os/posix/posix-dma.c b/include/os/posix/posix-dma.c
new file mode 100644
index 0000000..e8c5c9d
--- /dev/null
+++ b/include/os/posix/posix-dma.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+
+#include <nvgpu/mm.h>
+#include <nvgpu/vm.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/dma.h>
+#include <nvgpu/gmmu.h>
+#include <nvgpu/nvgpu_mem.h>
+#include <nvgpu/enabled.h>
+
+/*
+ * In userspace vidmem vs sysmem is just a difference in what is placed in the
+ * aperture field.
+ */
+static int __nvgpu_do_dma_alloc(struct gk20a *g, unsigned long flags,
+                                size_t size, struct nvgpu_mem *mem,
+                                enum nvgpu_aperture ap)
+{
+        void *memory = malloc(mem->aligned_size);
+
+        if (memory == NULL)
+                return -ENOMEM;
+
+        mem->cpu_va       = memory;
+        mem->aperture     = ap;
+        mem->size         = size;
+        mem->aligned_size = PAGE_ALIGN(size);
+        mem->gpu_va       = 0ULL;
+        mem->skip_wmb     = true;
+        mem->vidmem_alloc = NULL;
+        mem->allocator    = NULL;
+
+        return 0;
+}
+
+bool nvgpu_iommuable(struct gk20a *g)
+{
+        return false;
+}
+
+int nvgpu_dma_alloc_flags_sys(struct gk20a *g, unsigned long flags,
+                              size_t size, struct nvgpu_mem *mem)
+{
+        return __nvgpu_do_dma_alloc(g, flags, size, mem, APERTURE_SYSMEM);
+}
+
+int nvgpu_dma_alloc_flags_vid_at(struct gk20a *g, unsigned long flags,
+                                 size_t size, struct nvgpu_mem *mem, u64 at)
+{
+        BUG();
+
+        return 0;
+}
+
+void nvgpu_dma_free_sys(struct gk20a *g, struct nvgpu_mem *mem)
+{
+        if (!(mem->mem_flags & NVGPU_MEM_FLAG_SHADOW_COPY))
+                free(mem->cpu_va);
+
+        memset(mem, 0, sizeof(*mem));
+}
+
+void nvgpu_dma_free_vid(struct gk20a *g, struct nvgpu_mem *mem)
+{
+        BUG();
+}
diff --git a/include/os/posix/posix-nvgpu_mem.c b/include/os/posix/posix-nvgpu_mem.c
new file mode 100644
index 0000000..26770e4
--- /dev/null
+++ b/include/os/posix/posix-nvgpu_mem.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/bug.h>
+#include <nvgpu/dma.h>
+#include <nvgpu/gmmu.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/nvgpu_mem.h>
+
+/*
+ * These functions are somewhat meaningless.
+ */
+u64 nvgpu_mem_get_addr(struct gk20a *g, struct nvgpu_mem *mem)
+{
+        return (u64)(uintptr_t)mem->cpu_va;
+}
+
+u64 nvgpu_mem_get_phys_addr(struct gk20a *g, struct nvgpu_mem *mem)
+{
+        return (u64)(uintptr_t)mem->cpu_va;
+}
+
+static struct nvgpu_sgl *nvgpu_mem_sgl_next(struct nvgpu_sgl *sgl)
+{
+        return NULL;
+}
+
+static u64 nvgpu_mem_sgl_phys(struct gk20a *g, struct nvgpu_sgl *sgl)
+{
+        struct nvgpu_mem *mem = (struct nvgpu_mem *)sgl;
+
+        return (u64)(uintptr_t)mem->cpu_va;
+}
+
+static u64 nvgpu_mem_sgl_dma(struct nvgpu_sgl *sgl)
+{
+        struct nvgpu_mem *mem = (struct nvgpu_mem *)sgl;
+
+        return (u64)(uintptr_t)mem->cpu_va;
+}
+
+static u64 nvgpu_mem_sgl_length(struct nvgpu_sgl *sgl)
+{
+        struct nvgpu_mem *mem = (struct nvgpu_mem *)sgl;
+
+        return (u64)mem->aligned_size;
+}
+
+static u64 nvgpu_mem_sgl_gpu_addr(struct gk20a *g, struct nvgpu_sgl *sgl,
+                                  struct nvgpu_gmmu_attrs *attrs)
+{
+        struct nvgpu_mem *mem = (struct nvgpu_mem *)sgl;
+
+        return mem->gpu_va;
+}
+
+static bool nvgpu_mem_sgt_iommuable(struct gk20a *g, struct nvgpu_sgt *sgt)
+{
+        return nvgpu_iommuable(g);
+}
+
+static void nvgpu_mem_sgt_free(struct gk20a *g, struct nvgpu_sgt *sgt)
+{
+        nvgpu_kfree(g, sgt);
+}
+
+static struct nvgpu_sgt_ops nvgpu_sgt_posix_ops = {
+        .sgl_next       = nvgpu_mem_sgl_next,
+        .sgl_phys       = nvgpu_mem_sgl_phys,
+        .sgl_dma        = nvgpu_mem_sgl_dma,
+        .sgl_length     = nvgpu_mem_sgl_length,
+        .sgl_gpu_addr   = nvgpu_mem_sgl_gpu_addr,
+        .sgt_iommuable  = nvgpu_mem_sgt_iommuable,
+        .sgt_free       = nvgpu_mem_sgt_free,
+};
+
+struct nvgpu_sgt *nvgpu_sgt_create_from_mem(struct gk20a *g,
+                                            struct nvgpu_mem *mem)
+{
+        struct nvgpu_sgt *sgt = nvgpu_kzalloc(g, sizeof(*sgt));
+
+        if (sgt == NULL)
+                return NULL;
+
+        /*
+         * The userspace implementation is simple: a single 'entry' (which we
+         * only need the mem struct to describe). Maybe this could be expanded
+         * to be more interesting some day.
+         */
+        sgt->sgl = (struct nvgpu_sgl *)mem;
+        sgt->ops = &nvgpu_sgt_posix_ops;
+
+        return sgt;
+}
+
+int nvgpu_mem_create_from_mem(struct gk20a *g,
+                              struct nvgpu_mem *dest, struct nvgpu_mem *src,
+                              u64 start_page, int nr_pages)
+{
+        u64 start = start_page * PAGE_SIZE;
+        u64 size = nr_pages * PAGE_SIZE;
+
+        if (src->aperture != APERTURE_SYSMEM)
+                return -EINVAL;
+
+        /* Some silly things a caller might do... */
+        if (size > src->size)
+                return -EINVAL;
+        if ((start + size) > src->size)
+                return -EINVAL;
+
+        memset(dest, 0, sizeof(*dest));
+
+        dest->cpu_va    = ((char *)src->cpu_va) + start;
+        dest->mem_flags = src->mem_flags | NVGPU_MEM_FLAG_SHADOW_COPY;
+        dest->aperture  = src->aperture;
+        dest->skip_wmb  = src->skip_wmb;
+        dest->size      = size;
+
+        return 0;
+}
diff --git a/include/os/posix/posix-tsg.c b/include/os/posix/posix-tsg.c
new file mode 100644
index 0000000..d8e3f37
--- /dev/null
+++ b/include/os/posix/posix-tsg.c
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/tsg.h>
+
+void gk20a_tsg_event_id_post_event(struct tsg_gk20a *tsg,
+                                       int __event_id)
+{
+}
diff --git a/include/os/posix/posix-vm.c b/include/os/posix/posix-vm.c
new file mode 100644
index 0000000..588b956
--- /dev/null
+++ b/include/os/posix/posix-vm.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+
+#include <nvgpu/vm.h>
+#include <nvgpu/bug.h>
+
+#include <nvgpu/posix/vm.h>
+
+u64 nvgpu_os_buf_get_size(struct nvgpu_os_buffer *os_buf)
+{
+        return os_buf->size;
+}
+
+struct nvgpu_mapped_buf *nvgpu_vm_find_mapping(struct vm_gk20a *vm,
+                                               struct nvgpu_os_buffer *os_buf,
+                                               u64 map_addr,
+                                               u32 flags,
+                                               int kind)
+{
+        BUG();
+
+        /*
+         * No map caching for now.
+         */
+        return NULL;
+}
+
+void nvgpu_vm_unmap_system(struct nvgpu_mapped_buf *mapped_buffer)
+{
+        free(mapped_buffer->os_priv.buf);
+}
diff --git a/include/os/posix/posix-vpr.c b/include/os/posix/posix-vpr.c
new file mode 100644
index 0000000..07486b1
--- /dev/null
+++ b/include/os/posix/posix-vpr.c
@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <nvgpu/vpr.h>
+
+bool nvgpu_is_vpr_resize_enabled(void)
+{
+        return false;
+}
diff --git a/include/os/posix/rwsem.c b/include/os/posix/rwsem.c
new file mode 100644
index 0000000..7a696b7
--- /dev/null
+++ b/include/os/posix/rwsem.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/bug.h>
+#include <nvgpu/rwsem.h>
+#include <nvgpu/timers.h>
+
+#include <nvgpu/posix/rwsem.h>
+
+void nvgpu_rwsem_init(struct nvgpu_rwsem *rwsem)
+{
+        memset(rwsem, 0, sizeof(*rwsem));
+
+        nvgpu_spinlock_init(&rwsem->lock);
+}
+
+/*
+ * Acquire.
+ */
+void nvgpu_rwsem_down_read(struct nvgpu_rwsem *rwsem)
+{
+        while (true) {
+                nvgpu_spinlock_acquire(&rwsem->lock);
+
+                /*
+                 * If there's a writer try again.
+                 */
+                if (rwsem->writers < 0) {
+                        nvgpu_spinlock_release(&rwsem->lock);
+                        nvgpu_msleep(10);
+                        continue;
+                }
+
+                /*
+                 * Otherwise decrement the read counter and return.
+                 */
+                rwsem->readers -= 1;
+                nvgpu_spinlock_release(&rwsem->lock);
+                return;
+        }
+}
+
+/*
+ * Release.
+ */
+void nvgpu_rwsem_up_read(struct nvgpu_rwsem *rwsem)
+{
+        nvgpu_spinlock_acquire(&rwsem->lock);
+        rwsem->readers += 1;
+
+        /*
+         * Can't be any writers if there was a reader. Also can't be
+         * a positive number of readers. The increments are always
+         * downward so if we have a positive number then there is a
+         * balancing bug.
+         */
+        BUG_ON(rwsem->writers < 0);
+        BUG_ON(rwsem->readers > 0);
+
+        nvgpu_spinlock_release(&rwsem->lock);
+}
+
+void nvgpu_rwsem_down_write(struct nvgpu_rwsem *rwsem)
+{
+        while (true) {
+                nvgpu_spinlock_acquire(&rwsem->lock);
+
+                /*
+                 * If there's a reader or a writer try again. Note: in this very
+                 * simple implementation it's possible for readers to
+                 * indefinitely starve writers.
+                 */
+                if (rwsem->writers < 0 || rwsem->readers < 0) {
+                        nvgpu_spinlock_release(&rwsem->lock);
+                        nvgpu_msleep(10);
+                        continue;
+                }
+
+                rwsem->writers -= 1;
+                nvgpu_spinlock_release(&rwsem->lock);
+                return;
+        }
+}
+
+void nvgpu_rwsem_up_write(struct nvgpu_rwsem *rwsem)
+{
+        nvgpu_spinlock_acquire(&rwsem->lock);
+        rwsem->writers += 1;
+
+        /*
+         * Writers can't be positive: that would be an unbalanced free. Readers
+         * must be zero - otherwise this writer should never have had access!
+         */
+        BUG_ON(rwsem->writers > 0);
+        BUG_ON(rwsem->readers != 0);
+
+        nvgpu_spinlock_release(&rwsem->lock);
+}
diff --git a/include/os/posix/soc.c b/include/os/posix/soc.c
new file mode 100644
index 0000000..2346d61
--- /dev/null
+++ b/include/os/posix/soc.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/soc.h>
+
+bool nvgpu_platform_is_silicon(struct gk20a *g)
+{
+        return false;
+}
+
+bool nvgpu_platform_is_simulation(struct gk20a *g)
+{
+        return false;
+}
+
+bool nvgpu_platform_is_fpga(struct gk20a *g)
+{
+        return false;
+}
+
+bool nvgpu_is_hypervisor_mode(struct gk20a *g)
+{
+        return false;
+}
+
+bool nvgpu_is_bpmp_running(struct gk20a *g)
+{
+        return false;
+}
+
+bool nvgpu_is_soc_t194_a01(struct gk20a *g)
+{
+        return false;
+}
diff --git a/include/os/posix/stubs.c b/include/os/posix/stubs.c
new file mode 100644
index 0000000..279f4da
--- /dev/null
+++ b/include/os/posix/stubs.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * Here lie OS stubs that do not have an implementation yet nor has any plans
+ * for an implementation.
+ */
+
+#include <nvgpu/ecc.h>
+#include <nvgpu/ltc.h>
+
+#include "gk20a/dbg_gpu_gk20a.h"
+
+void nvgpu_dbg_session_post_event(struct dbg_session_gk20a *dbg_s)
+{
+}
+
+int nvgpu_ecc_sysfs_init(struct gk20a *g)
+{
+        return 0;
+}
+
+void nvgpu_ecc_sysfs_remove(struct gk20a *g)
+{
+}
+
+int nvgpu_ltc_alloc_cbc(struct gk20a *g, size_t compbit_backing_size,
+                        bool vidmem_alloc)
+{
+        return 0;
+}
diff --git a/include/os/posix/thread.c b/include/os/posix/thread.c
new file mode 100644
index 0000000..6fdce13
--- /dev/null
+++ b/include/os/posix/thread.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/bug.h>
+#include <nvgpu/thread.h>
+
+#include <nvgpu/posix/thread.h>
+
+/**
+ * Use pthreads to mostly emulate the Linux kernel APIs. There are some things
+ * that are quite different - especially the stop/should_stop notions. In user
+ * space threads can send signals to one another but of course within the kernel
+ * that is not as simple.
+ *
+ * This could use some nice debugging some day as well.
+ */
+
+/*
+ * nvgpu thread functions return int. POSIX threads return void *. This little
+ * wrapper takes the int returning nvgpu thread and instead passes that int back
+ * through the void * pointer.
+ */
+static void *__nvgpu_posix_thread_wrapper(void *data)
+{
+        struct nvgpu_posix_thread_data *nvgpu = data;
+
+        return ERR_PTR(nvgpu->fn(nvgpu->data));
+}
+
+int nvgpu_thread_create(struct nvgpu_thread *thread,
+                        void *data,
+                        int (*threadfn)(void *data), const char *name)
+{
+        int ret;
+
+        BUG_ON(thread->running);
+
+        memset(thread, 0, sizeof(*thread));
+
+        /*
+         * By subtracting 1 the above memset ensures that we have a zero
+         * terminated string.
+         */
+        strncpy(thread->tname, name, NVGPU_THREAD_POSIX_MAX_NAMELEN - 1);
+
+        thread->nvgpu.data = data;
+        thread->nvgpu.fn = threadfn;
+
+        ret = pthread_create(&thread->thread, NULL,
+                             __nvgpu_posix_thread_wrapper,
+                             &thread->nvgpu);
+        if (ret != 0)
+                return ret;
+
+#ifdef _GNU_SOURCE
+        pthread_setname_np(thread->thread, thread->tname);
+#endif
+
+        thread->running = true;
+
+        return 0;
+}
+
+void nvgpu_thread_stop(struct nvgpu_thread *thread)
+{
+        thread->should_stop = true;
+}
+
+bool nvgpu_thread_should_stop(struct nvgpu_thread *thread)
+{
+        return thread->should_stop;
+}
+
+bool nvgpu_thread_is_running(struct nvgpu_thread *thread)
+{
+        return thread->running;
+}
+
+void nvgpu_thread_join(struct nvgpu_thread *thread)
+{
+        (void) pthread_join(thread->thread, NULL);
+}
diff --git a/include/os/posix/timers.c b/include/os/posix/timers.c
new file mode 100644
index 0000000..c84b0de
--- /dev/null
+++ b/include/os/posix/timers.c
@@ -0,0 +1,169 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <sys/time.h>
+
+#include <nvgpu/bug.h>
+#include <nvgpu/log.h>
+#include <nvgpu/timers.h>
+
+static s64 now(void)
+{
+        return nvgpu_current_time_ms();
+}
+
+/*
+ * Returns true if a > b;
+ */
+static bool time_after(s64 a, s64 b)
+{
+        return a - b > 0;
+}
+
+int nvgpu_timeout_init(struct gk20a *g, struct nvgpu_timeout *timeout,
+                       u32 duration, unsigned long flags)
+{
+        if (flags & ~NVGPU_TIMER_FLAG_MASK)
+                return -EINVAL;
+
+        memset(timeout, 0, sizeof(*timeout));
+
+        timeout->g = g;
+        timeout->flags = flags;
+
+        if (flags & NVGPU_TIMER_RETRY_TIMER)
+                timeout->retries.max = duration;
+        else
+                timeout->time = nvgpu_current_time_ms() + (s64)duration;
+
+        return 0;
+}
+
+static int __nvgpu_timeout_expired_msg_cpu(struct nvgpu_timeout *timeout,
+                                         void *caller,
+                                         const char *fmt, va_list args)
+{
+        struct gk20a *g = timeout->g;
+
+        if (time_after(now(), timeout->time)) {
+                if (!(timeout->flags & NVGPU_TIMER_SILENT_TIMEOUT)) {
+                        char buf[128];
+
+                        vsnprintf(buf, sizeof(buf), fmt, args);
+
+                        nvgpu_err(g, "Timeout detected @ %p %s", caller, buf);
+                }
+
+                return -ETIMEDOUT;
+        }
+
+        return 0;
+}
+
+static int __nvgpu_timeout_expired_msg_retry(struct nvgpu_timeout *timeout,
+                                           void *caller,
+                                           const char *fmt, va_list args)
+{
+        struct gk20a *g = timeout->g;
+
+        if (timeout->retries.attempted >= timeout->retries.max) {
+                if (!(timeout->flags & NVGPU_TIMER_SILENT_TIMEOUT)) {
+                        char buf[128];
+
+                        vsnprintf(buf, sizeof(buf), fmt, args);
+
+                        nvgpu_err(g, "No more retries @ %p %s", caller, buf);
+                }
+
+                return -ETIMEDOUT;
+        }
+
+        timeout->retries.attempted++;
+
+        return 0;
+}
+
+int __nvgpu_timeout_expired_msg(struct nvgpu_timeout *timeout,
+                              void *caller, const char *fmt, ...)
+{
+        int ret;
+        va_list args;
+
+        va_start(args, fmt);
+        if (timeout->flags & NVGPU_TIMER_RETRY_TIMER)
+                ret = __nvgpu_timeout_expired_msg_retry(timeout, caller, fmt,
+                                                      args);
+        else
+                ret = __nvgpu_timeout_expired_msg_cpu(timeout, caller, fmt,
+                                                    args);
+        va_end(args);
+
+        return ret;
+}
+
+int nvgpu_timeout_peek_expired(struct nvgpu_timeout *timeout)
+{
+        if (timeout->flags & NVGPU_TIMER_RETRY_TIMER)
+                return timeout->retries.attempted >= timeout->retries.max;
+        else
+                return time_after(now(), timeout->time);
+}
+
+void nvgpu_udelay(unsigned int usecs)
+{
+        BUG();
+}
+
+void nvgpu_usleep_range(unsigned int min_us, unsigned int max_us)
+{
+        BUG();
+}
+
+void nvgpu_msleep(unsigned int msecs)
+{
+        BUG();
+}
+
+static inline s64 __nvgpu_current_time_us(void)
+{
+        struct timeval now;
+        s64 time_now;
+        int ret;
+
+        ret = gettimeofday(&now, NULL);
+        if (ret != 0)
+                BUG();
+
+        time_now = ((s64)now.tv_sec * (s64)1000000) + (s64)now.tv_usec;
+
+        return time_now;
+}
+
+s64 nvgpu_current_time_ms(void)
+{
+        return __nvgpu_current_time_us() / (s64)1000;
+}
+
+u64 nvgpu_hr_timestamp(void)
+{
+        return __nvgpu_current_time_us();
+}