gpu: nvgpu: remove dependency on linux header for sim_gk20a*

This patch removes linux dependencies from sim_gk20a.h under
gk20a/sim_gk20a.h. The following changes are made in this patch.

1) Created a linux based structure sim_gk20a_linux that contains a
common sim_gk20a struct inside it. The common struct sim_gk20a doesn't
contain any linux specific structs.
2) The common struct sim_gk20a contains an added function pointer which
is used to invoke gk20a_sim_esc_readl() method.
3) sim_gk20a.c is moved to nvgpu/common/linux along with a new header
sim_gk20a.h that contains the definition of struct sim_gk20a_linux.
4) struct gk20a now contains a pointer of sim_gk20a instead of the
entire object. The memory for this struct is allocated and  initialized during
gk20a_init_support() and freed during invocation of
gk20_remove_support().
5) We first obtain the pointer for struct sim_gk20a_linux from the
pointer of sim_gk20a using the container_of method in order to work on
the struct.

JIRA NVGPU-386

Change-Id: Ic82b8702642377f82694577a53c3ca0b9c1bb2ab
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1603073
GVS: Gerrit_Virtual_Submit
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

7 files changed, 268 insertions, 204 deletions

diff --git a/drivers/gpu/nvgpu/Makefile b/drivers/gpu/nvgpu/Makefile
index 29966d84..ef8237f3 100644
--- a/drivers/gpu/nvgpu/Makefile
+++ b/drivers/gpu/nvgpu/Makefile
@@ -48,6 +48,7 @@ nvgpu-y := \
         common/linux/sched.o \
         common/linux/channel.o \
         common/linux/ce2.o \
+        common/linux/sim_gk20a.o \
         common/mm/nvgpu_allocator.o \
         common/mm/bitmap_allocator.o \
         common/mm/buddy_allocator.o \
@@ -99,7 +100,6 @@ nvgpu-y := \
         gk20a/tsg_gk20a.o \
         gk20a/fecs_trace_gk20a.o \
         gk20a/mc_gk20a.o \
-        gk20a/sim_gk20a.o \
         gm20b/hal_gm20b.o \
         gm20b/bus_gm20b.o \
         gm20b/ltc_gm20b.o \
diff --git a/drivers/gpu/nvgpu/common/linux/module.c b/drivers/gpu/nvgpu/common/linux/module.c
index 4af62d5f..950b1581 100644
--- a/drivers/gpu/nvgpu/common/linux/module.c
+++ b/drivers/gpu/nvgpu/common/linux/module.c
@@ -47,6 +47,7 @@
 #include "intr.h"
 #include "cde.h"
 #include "ioctl.h"
+#include "sim_gk20a.h"
 #ifdef CONFIG_TEGRA_19x_GPU
 #include "nvgpu_gpuid_t19x.h"
 #ifdef CONFIG_TEGRA_GR_VIRTUALIZATION
@@ -637,11 +638,10 @@ void gk20a_remove_support(struct gk20a *g)
         if (g->mm.remove_support)
                 g->mm.remove_support(&g->mm);
 
-        if (g->sim.remove_support)
-                g->sim.remove_support(&g->sim);
+        if (g->sim->remove_support)
+                g->sim->remove_support(g->sim);
 
         /* free mappings to registers, etc */
-
         if (l->regs) {
                 iounmap(l->regs);
                 l->regs = NULL;
@@ -661,6 +661,11 @@ static int gk20a_init_support(struct platform_device *dev)
         int err = 0;
         struct gk20a *g = get_gk20a(&dev->dev);
         struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct sim_gk20a_linux *sim_linux = nvgpu_kzalloc(g, sizeof(*sim_linux));
+        if (!sim_linux)
+                goto fail;
+
+        g->sim = &sim_linux->sim;
 
         tegra_register_idle_unidle(gk20a_do_idle, gk20a_do_unidle, g);
 
@@ -681,13 +686,13 @@ static int gk20a_init_support(struct platform_device *dev)
         }
 
         if (nvgpu_platform_is_simulation(g)) {
-                g->sim.g = g;
-                g->sim.regs = gk20a_ioremap_resource(dev,
+                g->sim->g = g;
+                sim_linux->regs = gk20a_ioremap_resource(dev,
                                                      GK20A_SIM_IORESOURCE_MEM,
-                                                     &g->sim.reg_mem);
-                if (IS_ERR(g->sim.regs)) {
+                                                     &sim_linux->reg_mem);
+                if (IS_ERR(sim_linux->regs)) {
                         nvgpu_err(g, "failed to remap gk20a sim regs");
-                        err = PTR_ERR(g->sim.regs);
+                        err = PTR_ERR(sim_linux->regs);
                         goto fail;
                 }
 
@@ -703,6 +708,8 @@ static int gk20a_init_support(struct platform_device *dev)
         return 0;
 
 fail:
+        nvgpu_kfree(g, sim_linux);
+        g->sim = NULL;
         return err;
 }
 
diff --git a/drivers/gpu/nvgpu/gk20a/sim_gk20a.c b/drivers/gpu/nvgpu/common/linux/sim_gk20a.c
index ab064710..6b148df6 100644
--- a/drivers/gpu/nvgpu/gk20a/sim_gk20a.c
+++ b/drivers/gpu/nvgpu/common/linux/sim_gk20a.c
@@ -1,23 +1,17 @@
 /*
  * 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:
+ * 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.
  *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
+ * 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.
  *
- * 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.
+ * 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>
@@ -27,18 +21,19 @@
 #include <nvgpu/log.h>
 #include <nvgpu/linux/vm.h>
 
-#include "gk20a.h"
+#include "gk20a/gk20a.h"
+#include "sim_gk20a.h"
 
 #include <nvgpu/hw/gk20a/hw_sim_gk20a.h>
 
-static inline void sim_writel(struct gk20a *g, u32 r, u32 v)
+static inline void sim_writel(struct sim_gk20a_linux *sim_linux, u32 r, u32 v)
 {
-        writel(v, g->sim.regs + r);
+        writel(v, sim_linux->regs + r);
 }
 
-static inline u32 sim_readl(struct gk20a *g, u32 r)
+static inline u32 sim_readl(struct sim_gk20a_linux *sim_linux, u32 r)
 {
-        return readl(g->sim.regs + r);
+        return readl(sim_linux->regs + r);
 }
 
 static void kunmap_and_free_iopage(void **kvaddr, struct page **page)
@@ -55,23 +50,36 @@ static void kunmap_and_free_iopage(void **kvaddr, struct page **page)
 
 static void gk20a_free_sim_support(struct gk20a *g)
 {
+        struct sim_gk20a_linux *sim_linux =
+                container_of(g->sim, struct sim_gk20a_linux, sim);
         /* free sim mappings, bfrs */
-        kunmap_and_free_iopage(&g->sim.send_bfr.kvaddr,
-                               &g->sim.send_bfr.page);
+        kunmap_and_free_iopage(&sim_linux->send_bfr.kvaddr,
+                               &sim_linux->send_bfr.page);
 
-        kunmap_and_free_iopage(&g->sim.recv_bfr.kvaddr,
-                               &g->sim.recv_bfr.page);
+        kunmap_and_free_iopage(&sim_linux->recv_bfr.kvaddr,
+                               &sim_linux->recv_bfr.page);
 
-        kunmap_and_free_iopage(&g->sim.msg_bfr.kvaddr,
-                               &g->sim.msg_bfr.page);
+        kunmap_and_free_iopage(&sim_linux->msg_bfr.kvaddr,
+                               &sim_linux->msg_bfr.page);
 }
 
 static void gk20a_remove_sim_support(struct sim_gk20a *s)
 {
         struct gk20a *g = s->g;
-        if (g->sim.regs)
-                sim_writel(g, sim_config_r(), sim_config_mode_disabled_v());
+        struct sim_gk20a_linux *sim_linux =
+                container_of(g->sim, struct sim_gk20a_linux, sim);
+
+        if (sim_linux->regs)
+                sim_writel(sim_linux, sim_config_r(), sim_config_mode_disabled_v());
         gk20a_free_sim_support(g);
+
+        if (sim_linux->regs) {
+                iounmap(sim_linux->regs);
+                sim_linux->regs = NULL;
+        }
+
+        nvgpu_kfree(g, sim_linux);
+        g->sim = NULL;
 }
 
 static int alloc_and_kmap_iopage(struct gk20a *g,
@@ -103,72 +111,6 @@ static int alloc_and_kmap_iopage(struct gk20a *g,
 
 }
 
-int gk20a_init_sim_support(struct gk20a *g)
-{
-        int err = 0;
-        u64 phys;
-
-        /* allocate sim event/msg buffers */
-        err = alloc_and_kmap_iopage(g, &g->sim.send_bfr.kvaddr,
-                                    &g->sim.send_bfr.phys,
-                                    &g->sim.send_bfr.page);
-
-        err = err || alloc_and_kmap_iopage(g, &g->sim.recv_bfr.kvaddr,
-                                           &g->sim.recv_bfr.phys,
-                                           &g->sim.recv_bfr.page);
-
-        err = err || alloc_and_kmap_iopage(g, &g->sim.msg_bfr.kvaddr,
-                                           &g->sim.msg_bfr.phys,
-                                           &g->sim.msg_bfr.page);
-
-        if (!(g->sim.send_bfr.kvaddr && g->sim.recv_bfr.kvaddr &&
-              g->sim.msg_bfr.kvaddr)) {
-                nvgpu_err(g, "couldn't allocate all sim buffers");
-                goto fail;
-        }
-
-        /*mark send ring invalid*/
-        sim_writel(g, sim_send_ring_r(), sim_send_ring_status_invalid_f());
-
-        /*read get pointer and make equal to put*/
-        g->sim.send_ring_put = sim_readl(g, sim_send_get_r());
-        sim_writel(g, sim_send_put_r(), g->sim.send_ring_put);
-
-        /*write send ring address and make it valid*/
-        phys = g->sim.send_bfr.phys;
-        sim_writel(g, sim_send_ring_hi_r(),
-                   sim_send_ring_hi_addr_f(u64_hi32(phys)));
-        sim_writel(g, sim_send_ring_r(),
-                   sim_send_ring_status_valid_f() |
-                   sim_send_ring_target_phys_pci_coherent_f() |
-                   sim_send_ring_size_4kb_f() |
-                   sim_send_ring_addr_lo_f(phys >> PAGE_SHIFT));
-
-        /*repeat for recv ring (but swap put,get as roles are opposite) */
-        sim_writel(g, sim_recv_ring_r(), sim_recv_ring_status_invalid_f());
-
-        /*read put pointer and make equal to get*/
-        g->sim.recv_ring_get = sim_readl(g, sim_recv_put_r());
-        sim_writel(g, sim_recv_get_r(), g->sim.recv_ring_get);
-
-        /*write send ring address and make it valid*/
-        phys = g->sim.recv_bfr.phys;
-        sim_writel(g, sim_recv_ring_hi_r(),
-                   sim_recv_ring_hi_addr_f(u64_hi32(phys)));
-        sim_writel(g, sim_recv_ring_r(),
-                   sim_recv_ring_status_valid_f() |
-                   sim_recv_ring_target_phys_pci_coherent_f() |
-                   sim_recv_ring_size_4kb_f() |
-                   sim_recv_ring_addr_lo_f(phys >> PAGE_SHIFT));
-
-        g->sim.remove_support = gk20a_remove_sim_support;
-        return 0;
-
- fail:
-        gk20a_free_sim_support(g);
-        return err;
-}
-
 static inline u32 sim_msg_header_size(void)
 {
         return 24;/*TBD: fix the header to gt this from NV_VGPU_MSG_HEADER*/
@@ -176,7 +118,9 @@ static inline u32 sim_msg_header_size(void)
 
 static inline u32 *sim_msg_bfr(struct gk20a *g, u32 byte_offset)
 {
-        return (u32 *)(g->sim.msg_bfr.kvaddr + byte_offset);
+        struct sim_gk20a_linux *sim_linux =
+                container_of(g->sim, struct sim_gk20a_linux, sim);
+        return (u32 *)(sim_linux->msg_bfr.kvaddr + byte_offset);
 }
 
 static inline u32 *sim_msg_hdr(struct gk20a *g, u32 byte_offset)
@@ -192,7 +136,7 @@ static inline u32 *sim_msg_param(struct gk20a *g, u32 byte_offset)
 
 static inline void sim_write_hdr(struct gk20a *g, u32 func, u32 size)
 {
-        /*memset(g->sim.msg_bfr.kvaddr,0,min(PAGE_SIZE,size));*/
+        /*memset(g->sim->msg_bfr.kvaddr,0,min(PAGE_SIZE,size));*/
         *sim_msg_hdr(g, sim_msg_signature_r()) = sim_msg_signature_valid_v();
         *sim_msg_hdr(g, sim_msg_result_r())    = sim_msg_result_rpc_pending_v();
         *sim_msg_hdr(g, sim_msg_spare_r())     = sim_msg_spare__init_v();
@@ -207,62 +151,70 @@ static inline u32 sim_escape_read_hdr_size(void)
 
 static u32 *sim_send_ring_bfr(struct gk20a *g, u32 byte_offset)
 {
-        return (u32 *)(g->sim.send_bfr.kvaddr + byte_offset);
+        struct sim_gk20a_linux *sim_linux =
+                container_of(g->sim, struct sim_gk20a_linux, sim);
+        return (u32 *)(sim_linux->send_bfr.kvaddr + byte_offset);
 }
 
 static int rpc_send_message(struct gk20a *g)
 {
         /* calculations done in units of u32s */
-        u32 send_base = sim_send_put_pointer_v(g->sim.send_ring_put) * 2;
+        u32 send_base = sim_send_put_pointer_v(g->sim->send_ring_put) * 2;
         u32 dma_offset = send_base + sim_dma_r()/sizeof(u32);
         u32 dma_hi_offset = send_base + sim_dma_hi_r()/sizeof(u32);
+        struct sim_gk20a_linux *sim_linux =
+                container_of(g->sim, struct sim_gk20a_linux, sim);
 
         *sim_send_ring_bfr(g, dma_offset*sizeof(u32)) =
                 sim_dma_target_phys_pci_coherent_f() |
                 sim_dma_status_valid_f() |
                 sim_dma_size_4kb_f() |
-                sim_dma_addr_lo_f(g->sim.msg_bfr.phys >> PAGE_SHIFT);
+                sim_dma_addr_lo_f(sim_linux->msg_bfr.phys >> PAGE_SHIFT);
 
         *sim_send_ring_bfr(g, dma_hi_offset*sizeof(u32)) =
-                u64_hi32(g->sim.msg_bfr.phys);
+                u64_hi32(sim_linux->msg_bfr.phys);
 
-        *sim_msg_hdr(g, sim_msg_sequence_r()) = g->sim.sequence_base++;
+        *sim_msg_hdr(g, sim_msg_sequence_r()) = g->sim->sequence_base++;
 
-        g->sim.send_ring_put = (g->sim.send_ring_put + 2 * sizeof(u32)) %
+        g->sim->send_ring_put = (g->sim->send_ring_put + 2 * sizeof(u32)) %
                 PAGE_SIZE;
 
-        __cpuc_flush_dcache_area(g->sim.msg_bfr.kvaddr, PAGE_SIZE);
-        __cpuc_flush_dcache_area(g->sim.send_bfr.kvaddr, PAGE_SIZE);
-        __cpuc_flush_dcache_area(g->sim.recv_bfr.kvaddr, PAGE_SIZE);
+        __cpuc_flush_dcache_area(sim_linux->msg_bfr.kvaddr, PAGE_SIZE);
+        __cpuc_flush_dcache_area(sim_linux->send_bfr.kvaddr, PAGE_SIZE);
+        __cpuc_flush_dcache_area(sim_linux->recv_bfr.kvaddr, PAGE_SIZE);
 
         /* Update the put pointer. This will trap into the host. */
-        sim_writel(g, sim_send_put_r(), g->sim.send_ring_put);
+        sim_writel(sim_linux, sim_send_put_r(), g->sim->send_ring_put);
 
         return 0;
 }
 
 static inline u32 *sim_recv_ring_bfr(struct gk20a *g, u32 byte_offset)
 {
-        return (u32 *)(g->sim.recv_bfr.kvaddr + byte_offset);
+        struct sim_gk20a_linux *sim_linux =
+                container_of(g->sim, struct sim_gk20a_linux, sim);
+        return (u32 *)(sim_linux->recv_bfr.kvaddr + byte_offset);
 }
 
 static int rpc_recv_poll(struct gk20a *g)
 {
         u64 recv_phys_addr;
+        struct sim_gk20a_linux *sim_linux =
+                container_of(g->sim, struct sim_gk20a_linux, sim);
 
         /* XXX This read is not required (?) */
         /*pVGpu->recv_ring_get = VGPU_REG_RD32(pGpu, NV_VGPU_RECV_GET);*/
 
         /* Poll the recv ring get pointer in an infinite loop*/
         do {
-                g->sim.recv_ring_put = sim_readl(g, sim_recv_put_r());
-        } while (g->sim.recv_ring_put == g->sim.recv_ring_get);
+                g->sim->recv_ring_put = sim_readl(sim_linux, sim_recv_put_r());
+        } while (g->sim->recv_ring_put == g->sim->recv_ring_get);
 
         /* process all replies */
-        while (g->sim.recv_ring_put != g->sim.recv_ring_get) {
+        while (g->sim->recv_ring_put != g->sim->recv_ring_get) {
                 /* these are in u32 offsets*/
                 u32 dma_lo_offset =
-                        sim_recv_put_pointer_v(g->sim.recv_ring_get)*2 + 0;
+                        sim_recv_put_pointer_v(g->sim->recv_ring_get)*2 + 0;
                 u32 dma_hi_offset = dma_lo_offset + 1;
                 u32 recv_phys_addr_lo = sim_dma_addr_lo_v(
                                 *sim_recv_ring_bfr(g, dma_lo_offset*4));
@@ -272,23 +224,23 @@ static int rpc_recv_poll(struct gk20a *g)
                 recv_phys_addr = (u64)recv_phys_addr_hi << 32 |
                                  (u64)recv_phys_addr_lo << PAGE_SHIFT;
 
-                if (recv_phys_addr != g->sim.msg_bfr.phys) {
+                if (recv_phys_addr != sim_linux->msg_bfr.phys) {
                         nvgpu_err(g, "%s Error in RPC reply",
                                 __func__);
                         return -1;
                 }
 
                 /* Update GET pointer */
-                g->sim.recv_ring_get = (g->sim.recv_ring_get + 2*sizeof(u32)) %
+                g->sim->recv_ring_get = (g->sim->recv_ring_get + 2*sizeof(u32)) %
                         PAGE_SIZE;
 
-                __cpuc_flush_dcache_area(g->sim.msg_bfr.kvaddr, PAGE_SIZE);
-                __cpuc_flush_dcache_area(g->sim.send_bfr.kvaddr, PAGE_SIZE);
-                __cpuc_flush_dcache_area(g->sim.recv_bfr.kvaddr, PAGE_SIZE);
+                __cpuc_flush_dcache_area(sim_linux->msg_bfr.kvaddr, PAGE_SIZE);
+                __cpuc_flush_dcache_area(sim_linux->send_bfr.kvaddr, PAGE_SIZE);
+                __cpuc_flush_dcache_area(sim_linux->recv_bfr.kvaddr, PAGE_SIZE);
 
-                sim_writel(g, sim_recv_get_r(), g->sim.recv_ring_get);
+                sim_writel(sim_linux, sim_recv_get_r(), g->sim->recv_ring_get);
 
-                g->sim.recv_ring_put = sim_readl(g, sim_recv_put_r());
+                g->sim->recv_ring_put = sim_readl(sim_linux, sim_recv_put_r());
         }
 
         return 0;
@@ -321,7 +273,7 @@ static int issue_rpc_and_wait(struct gk20a *g)
         return 0;
 }
 
-int gk20a_sim_esc_readl(struct gk20a *g, char *path, u32 index, u32 *data)
+static int gk20a_sim_esc_readl(struct gk20a *g, char *path, u32 index, u32 *data)
 {
         int err;
         size_t pathlen = strlen(path);
@@ -341,3 +293,73 @@ int gk20a_sim_esc_readl(struct gk20a *g, char *path, u32 index, u32 *data)
                 memcpy(data, sim_msg_param(g, data_offset), sizeof(u32));
         return err;
 }
+
+
+int gk20a_init_sim_support(struct gk20a *g)
+{
+        int err = 0;
+        u64 phys;
+        struct sim_gk20a_linux *sim_linux =
+                container_of(g->sim, struct sim_gk20a_linux, sim);
+
+        /* allocate sim event/msg buffers */
+        err = alloc_and_kmap_iopage(g, &sim_linux->send_bfr.kvaddr,
+                                    &sim_linux->send_bfr.phys,
+                                    &sim_linux->send_bfr.page);
+
+        err = err || alloc_and_kmap_iopage(g, &sim_linux->recv_bfr.kvaddr,
+                                           &sim_linux->recv_bfr.phys,
+                                           &sim_linux->recv_bfr.page);
+
+        err = err || alloc_and_kmap_iopage(g, &sim_linux->msg_bfr.kvaddr,
+                                           &sim_linux->msg_bfr.phys,
+                                           &sim_linux->msg_bfr.page);
+
+        if (!(sim_linux->send_bfr.kvaddr && sim_linux->recv_bfr.kvaddr &&
+              sim_linux->msg_bfr.kvaddr)) {
+                nvgpu_err(g, "couldn't allocate all sim buffers");
+                goto fail;
+        }
+
+        /*mark send ring invalid*/
+        sim_writel(sim_linux, sim_send_ring_r(), sim_send_ring_status_invalid_f());
+
+        /*read get pointer and make equal to put*/
+        g->sim->send_ring_put = sim_readl(sim_linux, sim_send_get_r());
+        sim_writel(sim_linux, sim_send_put_r(), g->sim->send_ring_put);
+
+        /*write send ring address and make it valid*/
+        phys = sim_linux->send_bfr.phys;
+        sim_writel(sim_linux, sim_send_ring_hi_r(),
+                   sim_send_ring_hi_addr_f(u64_hi32(phys)));
+        sim_writel(sim_linux, sim_send_ring_r(),
+                   sim_send_ring_status_valid_f() |
+                   sim_send_ring_target_phys_pci_coherent_f() |
+                   sim_send_ring_size_4kb_f() |
+                   sim_send_ring_addr_lo_f(phys >> PAGE_SHIFT));
+
+        /*repeat for recv ring (but swap put,get as roles are opposite) */
+        sim_writel(sim_linux, sim_recv_ring_r(), sim_recv_ring_status_invalid_f());
+
+        /*read put pointer and make equal to get*/
+        g->sim->recv_ring_get = sim_readl(sim_linux, sim_recv_put_r());
+        sim_writel(sim_linux, sim_recv_get_r(), g->sim->recv_ring_get);
+
+        /*write send ring address and make it valid*/
+        phys = sim_linux->recv_bfr.phys;
+        sim_writel(sim_linux, sim_recv_ring_hi_r(),
+                   sim_recv_ring_hi_addr_f(u64_hi32(phys)));
+        sim_writel(sim_linux, sim_recv_ring_r(),
+                   sim_recv_ring_status_valid_f() |
+                   sim_recv_ring_target_phys_pci_coherent_f() |
+                   sim_recv_ring_size_4kb_f() |
+                   sim_recv_ring_addr_lo_f(phys >> PAGE_SHIFT));
+
+        g->sim->remove_support = gk20a_remove_sim_support;
+        g->sim->esc_readl = gk20a_sim_esc_readl;
+        return 0;
+
+ fail:
+        gk20a_free_sim_support(g);
+        return err;
+}
\ No newline at end of file
diff --git a/drivers/gpu/nvgpu/common/linux/sim_gk20a.h b/drivers/gpu/nvgpu/common/linux/sim_gk20a.h
new file mode 100644
index 00000000..c2d975b1
--- /dev/null
+++ b/drivers/gpu/nvgpu/common/linux/sim_gk20a.h
@@ -0,0 +1,39 @@
+/*
+ * drivers/video/tegra/host/gk20a/sim_gk20a.h
+ *
+ * GK20A sim support
+ *
+ * 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 __SIM_GK20A_LINUX_H__
+#define __SIM_GK20A_LINUX_H__
+
+#include "gk20a/sim_gk20a.h"
+
+struct sim_gk20a_linux {
+        struct sim_gk20a sim;
+        struct resource *reg_mem;
+        void __iomem *regs;
+        struct {
+                struct page *page;
+                void *kvaddr;
+                u64 phys;
+        } send_bfr, recv_bfr, msg_bfr;
+};
+
+int gk20a_init_sim_support(struct gk20a *g);
+
+#endif
diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.h b/drivers/gpu/nvgpu/gk20a/gk20a.h
index e586913e..8f3900a1 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.h
@@ -1127,7 +1127,7 @@ struct gk20a {
         struct clk_gk20a clk;
         struct fifo_gk20a fifo;
         struct gr_gk20a gr;
-        struct sim_gk20a sim;
+        struct sim_gk20a *sim;
         struct mm_gk20a mm;
         struct nvgpu_pmu pmu;
         struct acr_desc acr;
diff --git a/drivers/gpu/nvgpu/gk20a/gr_ctx_gk20a_sim.c b/drivers/gpu/nvgpu/gk20a/gr_ctx_gk20a_sim.c
index d496b7b9..146b0e22 100644
--- a/drivers/gpu/nvgpu/gk20a/gr_ctx_gk20a_sim.c
+++ b/drivers/gpu/nvgpu/gk20a/gr_ctx_gk20a_sim.c
@@ -41,47 +41,52 @@ int gr_gk20a_init_ctx_vars_sim(struct gk20a *g, struct gr_gk20a *gr)
         g->gr.ctx_vars.dynamic = true;
         g->gr.netlist = GR_NETLIST_DYNAMIC;
 
+        if(!g->sim->esc_readl) {
+                nvgpu_err(g, "Invalid pointer to query function.");
+                goto fail;
+        }
+
         /* query sizes and counts */
-        gk20a_sim_esc_readl(g, "GRCTX_UCODE_INST_FECS_COUNT", 0,
+        g->sim->esc_readl(g, "GRCTX_UCODE_INST_FECS_COUNT", 0,
                             &g->gr.ctx_vars.ucode.fecs.inst.count);
-        gk20a_sim_esc_readl(g, "GRCTX_UCODE_DATA_FECS_COUNT", 0,
+        g->sim->esc_readl(g, "GRCTX_UCODE_DATA_FECS_COUNT", 0,
                             &g->gr.ctx_vars.ucode.fecs.data.count);
-        gk20a_sim_esc_readl(g, "GRCTX_UCODE_INST_GPCCS_COUNT", 0,
+        g->sim->esc_readl(g, "GRCTX_UCODE_INST_GPCCS_COUNT", 0,
                             &g->gr.ctx_vars.ucode.gpccs.inst.count);
-        gk20a_sim_esc_readl(g, "GRCTX_UCODE_DATA_GPCCS_COUNT", 0,
+        g->sim->esc_readl(g, "GRCTX_UCODE_DATA_GPCCS_COUNT", 0,
                             &g->gr.ctx_vars.ucode.gpccs.data.count);
-        gk20a_sim_esc_readl(g, "GRCTX_ALL_CTX_TOTAL_WORDS", 0, &temp);
+        g->sim->esc_readl(g, "GRCTX_ALL_CTX_TOTAL_WORDS", 0, &temp);
         g->gr.ctx_vars.buffer_size = temp << 2;
-        gk20a_sim_esc_readl(g, "GRCTX_SW_BUNDLE_INIT_SIZE", 0,
+        g->sim->esc_readl(g, "GRCTX_SW_BUNDLE_INIT_SIZE", 0,
                             &g->gr.ctx_vars.sw_bundle_init.count);
-        gk20a_sim_esc_readl(g, "GRCTX_SW_METHOD_INIT_SIZE", 0,
+        g->sim->esc_readl(g, "GRCTX_SW_METHOD_INIT_SIZE", 0,
                             &g->gr.ctx_vars.sw_method_init.count);
-        gk20a_sim_esc_readl(g, "GRCTX_SW_CTX_LOAD_SIZE", 0,
+        g->sim->esc_readl(g, "GRCTX_SW_CTX_LOAD_SIZE", 0,
                             &g->gr.ctx_vars.sw_ctx_load.count);
-        gk20a_sim_esc_readl(g, "GRCTX_SW_VEID_BUNDLE_INIT_SIZE", 0,
+        g->sim->esc_readl(g, "GRCTX_SW_VEID_BUNDLE_INIT_SIZE", 0,
                             &g->gr.ctx_vars.sw_veid_bundle_init.count);
 
-        gk20a_sim_esc_readl(g, "GRCTX_NONCTXSW_REG_SIZE", 0,
+        g->sim->esc_readl(g, "GRCTX_NONCTXSW_REG_SIZE", 0,
                             &g->gr.ctx_vars.sw_non_ctx_load.count);
-        gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_SYS_COUNT", 0,
+        g->sim->esc_readl(g, "GRCTX_REG_LIST_SYS_COUNT", 0,
                             &g->gr.ctx_vars.ctxsw_regs.sys.count);
-        gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_GPC_COUNT", 0,
+        g->sim->esc_readl(g, "GRCTX_REG_LIST_GPC_COUNT", 0,
                             &g->gr.ctx_vars.ctxsw_regs.gpc.count);
-        gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_TPC_COUNT", 0,
+        g->sim->esc_readl(g, "GRCTX_REG_LIST_TPC_COUNT", 0,
                             &g->gr.ctx_vars.ctxsw_regs.tpc.count);
-        gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_ZCULL_GPC_COUNT", 0,
+        g->sim->esc_readl(g, "GRCTX_REG_LIST_ZCULL_GPC_COUNT", 0,
                             &g->gr.ctx_vars.ctxsw_regs.zcull_gpc.count);
-        gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PM_SYS_COUNT", 0,
+        g->sim->esc_readl(g, "GRCTX_REG_LIST_PM_SYS_COUNT", 0,
                             &g->gr.ctx_vars.ctxsw_regs.pm_sys.count);
-        gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PM_GPC_COUNT", 0,
+        g->sim->esc_readl(g, "GRCTX_REG_LIST_PM_GPC_COUNT", 0,
                             &g->gr.ctx_vars.ctxsw_regs.pm_gpc.count);
-        gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PM_TPC_COUNT", 0,
+        g->sim->esc_readl(g, "GRCTX_REG_LIST_PM_TPC_COUNT", 0,
                             &g->gr.ctx_vars.ctxsw_regs.pm_tpc.count);
-        gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PPC_COUNT", 0,
+        g->sim->esc_readl(g, "GRCTX_REG_LIST_PPC_COUNT", 0,
                             &g->gr.ctx_vars.ctxsw_regs.ppc.count);
-        gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_ETPC_COUNT", 0,
+        g->sim->esc_readl(g, "GRCTX_REG_LIST_ETPC_COUNT", 0,
                             &g->gr.ctx_vars.ctxsw_regs.etpc.count);
-        gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PPC_COUNT", 0,
+        g->sim->esc_readl(g, "GRCTX_REG_LIST_PPC_COUNT", 0,
                             &g->gr.ctx_vars.ctxsw_regs.ppc.count);
 
         err |= !alloc_u32_list_gk20a(g, &g->gr.ctx_vars.ucode.fecs.inst);
@@ -107,152 +112,152 @@ int gr_gk20a_init_ctx_vars_sim(struct gk20a *g, struct gr_gk20a *gr)
                 goto fail;
 
         for (i = 0; i < g->gr.ctx_vars.ucode.fecs.inst.count; i++)
-                gk20a_sim_esc_readl(g, "GRCTX_UCODE_INST_FECS",
+                g->sim->esc_readl(g, "GRCTX_UCODE_INST_FECS",
                                     i, &g->gr.ctx_vars.ucode.fecs.inst.l[i]);
 
         for (i = 0; i < g->gr.ctx_vars.ucode.fecs.data.count; i++)
-                gk20a_sim_esc_readl(g, "GRCTX_UCODE_DATA_FECS",
+                g->sim->esc_readl(g, "GRCTX_UCODE_DATA_FECS",
                                     i, &g->gr.ctx_vars.ucode.fecs.data.l[i]);
 
         for (i = 0; i < g->gr.ctx_vars.ucode.gpccs.inst.count; i++)
-                gk20a_sim_esc_readl(g, "GRCTX_UCODE_INST_GPCCS",
+                g->sim->esc_readl(g, "GRCTX_UCODE_INST_GPCCS",
                                     i, &g->gr.ctx_vars.ucode.gpccs.inst.l[i]);
 
         for (i = 0; i < g->gr.ctx_vars.ucode.gpccs.data.count; i++)
-                gk20a_sim_esc_readl(g, "GRCTX_UCODE_DATA_GPCCS",
+                g->sim->esc_readl(g, "GRCTX_UCODE_DATA_GPCCS",
                                     i, &g->gr.ctx_vars.ucode.gpccs.data.l[i]);
 
         for (i = 0; i < g->gr.ctx_vars.sw_bundle_init.count; i++) {
                 struct av_gk20a *l = g->gr.ctx_vars.sw_bundle_init.l;
-                gk20a_sim_esc_readl(g, "GRCTX_SW_BUNDLE_INIT:ADDR",
+                g->sim->esc_readl(g, "GRCTX_SW_BUNDLE_INIT:ADDR",
                                     i, &l[i].addr);
-                gk20a_sim_esc_readl(g, "GRCTX_SW_BUNDLE_INIT:VALUE",
+                g->sim->esc_readl(g, "GRCTX_SW_BUNDLE_INIT:VALUE",
                                     i, &l[i].value);
         }
 
         for (i = 0; i < g->gr.ctx_vars.sw_method_init.count; i++) {
                 struct av_gk20a *l = g->gr.ctx_vars.sw_method_init.l;
-                gk20a_sim_esc_readl(g, "GRCTX_SW_METHOD_INIT:ADDR",
+                g->sim->esc_readl(g, "GRCTX_SW_METHOD_INIT:ADDR",
                                     i, &l[i].addr);
-                gk20a_sim_esc_readl(g, "GRCTX_SW_METHOD_INIT:VALUE",
+                g->sim->esc_readl(g, "GRCTX_SW_METHOD_INIT:VALUE",
                                     i, &l[i].value);
         }
 
         for (i = 0; i < g->gr.ctx_vars.sw_ctx_load.count; i++) {
                 struct aiv_gk20a *l = g->gr.ctx_vars.sw_ctx_load.l;
-                gk20a_sim_esc_readl(g, "GRCTX_SW_CTX_LOAD:ADDR",
+                g->sim->esc_readl(g, "GRCTX_SW_CTX_LOAD:ADDR",
                                     i, &l[i].addr);
-                gk20a_sim_esc_readl(g, "GRCTX_SW_CTX_LOAD:INDEX",
+                g->sim->esc_readl(g, "GRCTX_SW_CTX_LOAD:INDEX",
                                     i, &l[i].index);
-                gk20a_sim_esc_readl(g, "GRCTX_SW_CTX_LOAD:VALUE",
+                g->sim->esc_readl(g, "GRCTX_SW_CTX_LOAD:VALUE",
                                     i, &l[i].value);
         }
 
         for (i = 0; i < g->gr.ctx_vars.sw_non_ctx_load.count; i++) {
                 struct av_gk20a *l = g->gr.ctx_vars.sw_non_ctx_load.l;
-                gk20a_sim_esc_readl(g, "GRCTX_NONCTXSW_REG:REG",
+                g->sim->esc_readl(g, "GRCTX_NONCTXSW_REG:REG",
                                     i, &l[i].addr);
-                gk20a_sim_esc_readl(g, "GRCTX_NONCTXSW_REG:VALUE",
+                g->sim->esc_readl(g, "GRCTX_NONCTXSW_REG:VALUE",
                                     i, &l[i].value);
         }
 
         for (i = 0; i < g->gr.ctx_vars.sw_veid_bundle_init.count; i++) {
                 struct av_gk20a *l = g->gr.ctx_vars.sw_veid_bundle_init.l;
 
-                gk20a_sim_esc_readl(g, "GRCTX_SW_VEID_BUNDLE_INIT:ADDR",
+                g->sim->esc_readl(g, "GRCTX_SW_VEID_BUNDLE_INIT:ADDR",
                                     i, &l[i].addr);
-                gk20a_sim_esc_readl(g, "GRCTX_SW_VEID_BUNDLE_INIT:VALUE",
+                g->sim->esc_readl(g, "GRCTX_SW_VEID_BUNDLE_INIT:VALUE",
                                     i, &l[i].value);
         }
 
         for (i = 0; i < g->gr.ctx_vars.ctxsw_regs.sys.count; i++) {
                 struct aiv_gk20a *l = g->gr.ctx_vars.ctxsw_regs.sys.l;
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_SYS:ADDR",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_SYS:ADDR",
                                     i, &l[i].addr);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_SYS:INDEX",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_SYS:INDEX",
                                     i, &l[i].index);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_SYS:VALUE",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_SYS:VALUE",
                                     i, &l[i].value);
         }
 
         for (i = 0; i < g->gr.ctx_vars.ctxsw_regs.gpc.count; i++) {
                 struct aiv_gk20a *l = g->gr.ctx_vars.ctxsw_regs.gpc.l;
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_GPC:ADDR",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_GPC:ADDR",
                                     i, &l[i].addr);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_GPC:INDEX",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_GPC:INDEX",
                                     i, &l[i].index);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_GPC:VALUE",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_GPC:VALUE",
                                     i, &l[i].value);
         }
 
         for (i = 0; i < g->gr.ctx_vars.ctxsw_regs.tpc.count; i++) {
                 struct aiv_gk20a *l = g->gr.ctx_vars.ctxsw_regs.tpc.l;
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_TPC:ADDR",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_TPC:ADDR",
                                     i, &l[i].addr);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_TPC:INDEX",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_TPC:INDEX",
                                     i, &l[i].index);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_TPC:VALUE",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_TPC:VALUE",
                                     i, &l[i].value);
         }
 
         for (i = 0; i < g->gr.ctx_vars.ctxsw_regs.ppc.count; i++) {
                 struct aiv_gk20a *l = g->gr.ctx_vars.ctxsw_regs.ppc.l;
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PPC:ADDR",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_PPC:ADDR",
                                     i, &l[i].addr);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PPC:INDEX",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_PPC:INDEX",
                                     i, &l[i].index);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PPC:VALUE",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_PPC:VALUE",
                                     i, &l[i].value);
         }
 
         for (i = 0; i < g->gr.ctx_vars.ctxsw_regs.zcull_gpc.count; i++) {
                 struct aiv_gk20a *l = g->gr.ctx_vars.ctxsw_regs.zcull_gpc.l;
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_ZCULL_GPC:ADDR",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_ZCULL_GPC:ADDR",
                                     i, &l[i].addr);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_ZCULL_GPC:INDEX",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_ZCULL_GPC:INDEX",
                                     i, &l[i].index);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_ZCULL_GPC:VALUE",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_ZCULL_GPC:VALUE",
                                     i, &l[i].value);
         }
 
         for (i = 0; i < g->gr.ctx_vars.ctxsw_regs.pm_sys.count; i++) {
                 struct aiv_gk20a *l = g->gr.ctx_vars.ctxsw_regs.pm_sys.l;
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PM_SYS:ADDR",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_PM_SYS:ADDR",
                                     i, &l[i].addr);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PM_SYS:INDEX",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_PM_SYS:INDEX",
                                     i, &l[i].index);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PM_SYS:VALUE",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_PM_SYS:VALUE",
                                     i, &l[i].value);
         }
 
         for (i = 0; i < g->gr.ctx_vars.ctxsw_regs.pm_gpc.count; i++) {
                 struct aiv_gk20a *l = g->gr.ctx_vars.ctxsw_regs.pm_gpc.l;
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PM_GPC:ADDR",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_PM_GPC:ADDR",
                                     i, &l[i].addr);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PM_GPC:INDEX",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_PM_GPC:INDEX",
                                     i, &l[i].index);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PM_GPC:VALUE",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_PM_GPC:VALUE",
                                     i, &l[i].value);
         }
 
         for (i = 0; i < g->gr.ctx_vars.ctxsw_regs.pm_tpc.count; i++) {
                 struct aiv_gk20a *l = g->gr.ctx_vars.ctxsw_regs.pm_tpc.l;
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PM_TPC:ADDR",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_PM_TPC:ADDR",
                                     i, &l[i].addr);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PM_TPC:INDEX",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_PM_TPC:INDEX",
                                     i, &l[i].index);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_PM_TPC:VALUE",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_PM_TPC:VALUE",
                                     i, &l[i].value);
         }
 
         gk20a_dbg(gpu_dbg_info | gpu_dbg_fn, "query GRCTX_REG_LIST_ETPC");
         for (i = 0; i < g->gr.ctx_vars.ctxsw_regs.etpc.count; i++) {
                 struct aiv_gk20a *l = g->gr.ctx_vars.ctxsw_regs.etpc.l;
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_ETPC:ADDR",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_ETPC:ADDR",
                                     i, &l[i].addr);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_ETPC:INDEX",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_ETPC:INDEX",
                                     i, &l[i].index);
-                gk20a_sim_esc_readl(g, "GRCTX_REG_LIST_ETPC:VALUE",
+                g->sim->esc_readl(g, "GRCTX_REG_LIST_ETPC:VALUE",
                                     i, &l[i].value);
                 gk20a_dbg(gpu_dbg_info | gpu_dbg_fn,
                                 "addr:0x%#08x index:0x%08x value:0x%08x",
@@ -261,7 +266,7 @@ int gr_gk20a_init_ctx_vars_sim(struct gk20a *g, struct gr_gk20a *gr)
 
         g->gr.ctx_vars.valid = true;
 
-        gk20a_sim_esc_readl(g, "GRCTX_GEN_CTX_REGS_BASE_INDEX", 0,
+        g->sim->esc_readl(g, "GRCTX_GEN_CTX_REGS_BASE_INDEX", 0,
                             &g->gr.ctx_vars.regs_base_index);
 
         gk20a_dbg(gpu_dbg_info | gpu_dbg_fn, "finished querying grctx info from chiplib");
diff --git a/drivers/gpu/nvgpu/gk20a/sim_gk20a.h b/drivers/gpu/nvgpu/gk20a/sim_gk20a.h
index 44378e7a..8f23abd8 100644
--- a/drivers/gpu/nvgpu/gk20a/sim_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/sim_gk20a.h
@@ -3,7 +3,7 @@
  *
  * GK20A sim support
  *
- * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2013-2017, 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"),
@@ -27,25 +27,16 @@
 #define __SIM_GK20A_H__
 
 struct gk20a;
-struct platform_device;
 
 struct sim_gk20a {
         struct gk20a *g;
-        struct resource *reg_mem;
-        void __iomem *regs;
-        struct {
-                struct page *page;
-                void *kvaddr;
-                u64 phys;
-        } send_bfr, recv_bfr, msg_bfr;
         u32 send_ring_put;
         u32 recv_ring_get;
         u32 recv_ring_put;
         u32 sequence_base;
         void (*remove_support)(struct sim_gk20a *);
+        int (*esc_readl)(
+                struct gk20a *g, char *path, u32 index, u32 *data);
 };
 
-int gk20a_init_sim_support(struct gk20a *g);
-int gk20a_sim_esc_readl(struct gk20a *g, char *path, u32 index, u32 *data);
-
 #endif /*__SIM_GK20A_H__*/