1 files changed, 381 insertions, 0 deletions

diff --git a/drivers/gpu/drm/lima/lima_gem.c b/drivers/gpu/drm/lima/lima_gem.c
new file mode 100644
index 000000000000..2d3cf96f6c58
--- /dev/null
+++ b/drivers/gpu/drm/lima/lima_gem.c
@@ -0,0 +1,381 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/* Copyright 2017-2019 Qiang Yu <yuq825@gmail.com> */
+
+#include <linux/sync_file.h>
+#include <linux/pfn_t.h>
+
+#include <drm/drm_file.h>
+#include <drm/drm_syncobj.h>
+#include <drm/drm_utils.h>
+
+#include <drm/lima_drm.h>
+
+#include "lima_drv.h"
+#include "lima_gem.h"
+#include "lima_gem_prime.h"
+#include "lima_vm.h"
+#include "lima_object.h"
+
+int lima_gem_create_handle(struct drm_device *dev, struct drm_file *file,
+                           u32 size, u32 flags, u32 *handle)
+{
+        int err;
+        struct lima_bo *bo;
+        struct lima_device *ldev = to_lima_dev(dev);
+
+        bo = lima_bo_create(ldev, size, flags, NULL, NULL);
+        if (IS_ERR(bo))
+                return PTR_ERR(bo);
+
+        err = drm_gem_handle_create(file, &bo->gem, handle);
+
+        /* drop reference from allocate - handle holds it now */
+        drm_gem_object_put_unlocked(&bo->gem);
+
+        return err;
+}
+
+void lima_gem_free_object(struct drm_gem_object *obj)
+{
+        struct lima_bo *bo = to_lima_bo(obj);
+
+        if (!list_empty(&bo->va))
+                dev_err(obj->dev->dev, "lima gem free bo still has va\n");
+
+        lima_bo_destroy(bo);
+}
+
+int lima_gem_object_open(struct drm_gem_object *obj, struct drm_file *file)
+{
+        struct lima_bo *bo = to_lima_bo(obj);
+        struct lima_drm_priv *priv = to_lima_drm_priv(file);
+        struct lima_vm *vm = priv->vm;
+
+        return lima_vm_bo_add(vm, bo, true);
+}
+
+void lima_gem_object_close(struct drm_gem_object *obj, struct drm_file *file)
+{
+        struct lima_bo *bo = to_lima_bo(obj);
+        struct lima_drm_priv *priv = to_lima_drm_priv(file);
+        struct lima_vm *vm = priv->vm;
+
+        lima_vm_bo_del(vm, bo);
+}
+
+int lima_gem_get_info(struct drm_file *file, u32 handle, u32 *va, u64 *offset)
+{
+        struct drm_gem_object *obj;
+        struct lima_bo *bo;
+        struct lima_drm_priv *priv = to_lima_drm_priv(file);
+        struct lima_vm *vm = priv->vm;
+        int err;
+
+        obj = drm_gem_object_lookup(file, handle);
+        if (!obj)
+                return -ENOENT;
+
+        bo = to_lima_bo(obj);
+
+        *va = lima_vm_get_va(vm, bo);
+
+        err = drm_gem_create_mmap_offset(obj);
+        if (!err)
+                *offset = drm_vma_node_offset_addr(&obj->vma_node);
+
+        drm_gem_object_put_unlocked(obj);
+        return err;
+}
+
+static vm_fault_t lima_gem_fault(struct vm_fault *vmf)
+{
+        struct vm_area_struct *vma = vmf->vma;
+        struct drm_gem_object *obj = vma->vm_private_data;
+        struct lima_bo *bo = to_lima_bo(obj);
+        pfn_t pfn;
+        pgoff_t pgoff;
+
+        /* We don't use vmf->pgoff since that has the fake offset: */
+        pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
+        pfn = __pfn_to_pfn_t(page_to_pfn(bo->pages[pgoff]), PFN_DEV);
+
+        return vmf_insert_mixed(vma, vmf->address, pfn);
+}
+
+const struct vm_operations_struct lima_gem_vm_ops = {
+        .fault = lima_gem_fault,
+        .open = drm_gem_vm_open,
+        .close = drm_gem_vm_close,
+};
+
+void lima_set_vma_flags(struct vm_area_struct *vma)
+{
+        pgprot_t prot = vm_get_page_prot(vma->vm_flags);
+
+        vma->vm_flags |= VM_MIXEDMAP;
+        vma->vm_flags &= ~VM_PFNMAP;
+        vma->vm_page_prot = pgprot_writecombine(prot);
+}
+
+int lima_gem_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+        int ret;
+
+        ret = drm_gem_mmap(filp, vma);
+        if (ret)
+                return ret;
+
+        lima_set_vma_flags(vma);
+        return 0;
+}
+
+static int lima_gem_sync_bo(struct lima_sched_task *task, struct lima_bo *bo,
+                            bool write, bool explicit)
+{
+        int err = 0;
+
+        if (!write) {
+                err = reservation_object_reserve_shared(bo->gem.resv, 1);
+                if (err)
+                        return err;
+        }
+
+        /* explicit sync use user passed dep fence */
+        if (explicit)
+                return 0;
+
+        /* implicit sync use bo fence in resv obj */
+        if (write) {
+                unsigned nr_fences;
+                struct dma_fence **fences;
+                int i;
+
+                err = reservation_object_get_fences_rcu(
+                        bo->gem.resv, NULL, &nr_fences, &fences);
+                if (err || !nr_fences)
+                        return err;
+
+                for (i = 0; i < nr_fences; i++) {
+                        err = lima_sched_task_add_dep(task, fences[i]);
+                        if (err)
+                                break;
+                }
+
+                /* for error case free remaining fences */
+                for ( ; i < nr_fences; i++)
+                        dma_fence_put(fences[i]);
+
+                kfree(fences);
+        } else {
+                struct dma_fence *fence;
+
+                fence = reservation_object_get_excl_rcu(bo->gem.resv);
+                if (fence) {
+                        err = lima_sched_task_add_dep(task, fence);
+                        if (err)
+                                dma_fence_put(fence);
+                }
+        }
+
+        return err;
+}
+
+static int lima_gem_lock_bos(struct lima_bo **bos, u32 nr_bos,
+                             struct ww_acquire_ctx *ctx)
+{
+        int i, ret = 0, contended, slow_locked = -1;
+
+        ww_acquire_init(ctx, &reservation_ww_class);
+
+retry:
+        for (i = 0; i < nr_bos; i++) {
+                if (i == slow_locked) {
+                        slow_locked = -1;
+                        continue;
+                }
+
+                ret = ww_mutex_lock_interruptible(&bos[i]->gem.resv->lock, ctx);
+                if (ret < 0) {
+                        contended = i;
+                        goto err;
+                }
+        }
+
+        ww_acquire_done(ctx);
+        return 0;
+
+err:
+        for (i--; i >= 0; i--)
+                ww_mutex_unlock(&bos[i]->gem.resv->lock);
+
+        if (slow_locked >= 0)
+                ww_mutex_unlock(&bos[slow_locked]->gem.resv->lock);
+
+        if (ret == -EDEADLK) {
+                /* we lost out in a seqno race, lock and retry.. */
+                ret = ww_mutex_lock_slow_interruptible(
+                        &bos[contended]->gem.resv->lock, ctx);
+                if (!ret) {
+                        slow_locked = contended;
+                        goto retry;
+                }
+        }
+        ww_acquire_fini(ctx);
+
+        return ret;
+}
+
+static void lima_gem_unlock_bos(struct lima_bo **bos, u32 nr_bos,
+                                struct ww_acquire_ctx *ctx)
+{
+        int i;
+
+        for (i = 0; i < nr_bos; i++)
+                ww_mutex_unlock(&bos[i]->gem.resv->lock);
+        ww_acquire_fini(ctx);
+}
+
+static int lima_gem_add_deps(struct drm_file *file, struct lima_submit *submit)
+{
+        int i, err;
+
+        for (i = 0; i < ARRAY_SIZE(submit->in_sync); i++) {
+                struct dma_fence *fence = NULL;
+
+                if (!submit->in_sync[i])
+                        continue;
+
+                err = drm_syncobj_find_fence(file, submit->in_sync[i],
+                                             0, 0, &fence);
+                if (err)
+                        return err;
+
+                err = lima_sched_task_add_dep(submit->task, fence);
+                if (err) {
+                        dma_fence_put(fence);
+                        return err;
+                }
+        }
+
+        return 0;
+}
+
+int lima_gem_submit(struct drm_file *file, struct lima_submit *submit)
+{
+        int i, err = 0;
+        struct ww_acquire_ctx ctx;
+        struct lima_drm_priv *priv = to_lima_drm_priv(file);
+        struct lima_vm *vm = priv->vm;
+        struct drm_syncobj *out_sync = NULL;
+        struct dma_fence *fence;
+        struct lima_bo **bos = submit->lbos;
+
+        if (submit->out_sync) {
+                out_sync = drm_syncobj_find(file, submit->out_sync);
+                if (!out_sync)
+                        return -ENOENT;
+        }
+
+        for (i = 0; i < submit->nr_bos; i++) {
+                struct drm_gem_object *obj;
+                struct lima_bo *bo;
+
+                obj = drm_gem_object_lookup(file, submit->bos[i].handle);
+                if (!obj) {
+                        err = -ENOENT;
+                        goto err_out0;
+                }
+
+                bo = to_lima_bo(obj);
+
+                /* increase refcnt of gpu va map to prevent unmapped when executing,
+                 * will be decreased when task done
+                 */
+                err = lima_vm_bo_add(vm, bo, false);
+                if (err) {
+                        drm_gem_object_put_unlocked(obj);
+                        goto err_out0;
+                }
+
+                bos[i] = bo;
+        }
+
+        err = lima_gem_lock_bos(bos, submit->nr_bos, &ctx);
+        if (err)
+                goto err_out0;
+
+        err = lima_sched_task_init(
+                submit->task, submit->ctx->context + submit->pipe,
+                bos, submit->nr_bos, vm);
+        if (err)
+                goto err_out1;
+
+        err = lima_gem_add_deps(file, submit);
+        if (err)
+                goto err_out2;
+
+        for (i = 0; i < submit->nr_bos; i++) {
+                err = lima_gem_sync_bo(
+                        submit->task, bos[i],
+                        submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE,
+                        submit->flags & LIMA_SUBMIT_FLAG_EXPLICIT_FENCE);
+                if (err)
+                        goto err_out2;
+        }
+
+        fence = lima_sched_context_queue_task(
+                submit->ctx->context + submit->pipe, submit->task);
+
+        for (i = 0; i < submit->nr_bos; i++) {
+                if (submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE)
+                        reservation_object_add_excl_fence(bos[i]->gem.resv, fence);
+                else
+                        reservation_object_add_shared_fence(bos[i]->gem.resv, fence);
+        }
+
+        lima_gem_unlock_bos(bos, submit->nr_bos, &ctx);
+
+        for (i = 0; i < submit->nr_bos; i++)
+                drm_gem_object_put_unlocked(&bos[i]->gem);
+
+        if (out_sync) {
+                drm_syncobj_replace_fence(out_sync, fence);
+                drm_syncobj_put(out_sync);
+        }
+
+        dma_fence_put(fence);
+
+        return 0;
+
+err_out2:
+        lima_sched_task_fini(submit->task);
+err_out1:
+        lima_gem_unlock_bos(bos, submit->nr_bos, &ctx);
+err_out0:
+        for (i = 0; i < submit->nr_bos; i++) {
+                if (!bos[i])
+                        break;
+                lima_vm_bo_del(vm, bos[i]);
+                drm_gem_object_put_unlocked(&bos[i]->gem);
+        }
+        if (out_sync)
+                drm_syncobj_put(out_sync);
+        return err;
+}
+
+int lima_gem_wait(struct drm_file *file, u32 handle, u32 op, s64 timeout_ns)
+{
+        bool write = op & LIMA_GEM_WAIT_WRITE;
+        long ret, timeout;
+
+        if (!op)
+                return 0;
+
+        timeout = drm_timeout_abs_to_jiffies(timeout_ns);
+
+        ret = drm_gem_reservation_object_wait(file, handle, write, timeout);
+        if (ret == 0)
+                ret = timeout ? -ETIMEDOUT : -EBUSY;
+
+        return ret;
+}