gpu: nvgpu: unit: add negative tests for common.gr.ctx

Add negative tests that inject memory allocation failures and verify
error handling path in common.gr.ctx unit.

Update common.gr.global_ctx unit test to check if global context
buffers are ready after allocation call.

Jira NVGPU-4373

Change-Id: Ia373441819257890f9f10667e6e2e363081a6757
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2259074
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

Makefile.umbrella.tmk

@@ -109,6 +109,7 @@ NV_REPOSITORY_COMPONENTS += userspace/units/gr/init
 NV_REPOSITORY_COMPONENTS += userspace/units/gr/setup
 NV_REPOSITORY_COMPONENTS += userspace/units/gr/fs_state
 NV_REPOSITORY_COMPONENTS += userspace/units/gr/global_ctx
+NV_REPOSITORY_COMPONENTS += userspace/units/gr/ctx
 NV_REPOSITORY_COMPONENTS += userspace/units/gr/intr
 NV_REPOSITORY_COMPONENTS += userspace/units/acr
 NV_REPOSITORY_COMPONENTS += userspace/units/ce

drivers/gpu/nvgpu/libnvgpu-drv_safe.export

@@ -305,6 +305,19 @@ nvgpu_gr_global_ctx_init_local_golden_image
 nvgpu_gr_global_ctx_load_local_golden_image
 nvgpu_gr_global_ctx_compare_golden_images
 nvgpu_gr_global_ctx_deinit_local_golden_image
+nvgpu_gr_ctx_desc_alloc
+nvgpu_gr_ctx_desc_free
+nvgpu_alloc_gr_ctx_struct
+nvgpu_free_gr_ctx_struct
+nvgpu_gr_ctx_alloc
+nvgpu_gr_ctx_free
+nvgpu_gr_ctx_set_size
+nvgpu_gr_ctx_alloc_patch_ctx
+nvgpu_gr_ctx_free_patch_ctx
+nvgpu_gr_ctx_map_global_ctx_buffers
+nvgpu_gr_ctx_patch_write_begin
+nvgpu_gr_ctx_patch_write
+nvgpu_gr_ctx_patch_write_end
 nvgpu_hr_timestamp
 nvgpu_init_ltc_support
 nvgpu_ltc_ecc_free
@@ -385,7 +398,6 @@ nvgpu_finalize_poweron
 nvgpu_free
 nvgpu_free_enabled_flags
 nvgpu_free_fixed
-nvgpu_free_gr_ctx_struct
 nvgpu_get_pte
 nvgpu_gmmu_init_page_table
 nvgpu_gmmu_map

userspace/Makefile.sources

@@ -116,6 +116,7 @@ UNITS :=				\
 	$(UNIT_SRC)/gr/init		\
 	$(UNIT_SRC)/gr/fs_state		\
 	$(UNIT_SRC)/gr/global_ctx	\
+	$(UNIT_SRC)/gr/ctx		\
 	$(UNIT_SRC)/gr/intr		\
 	$(UNIT_SRC)/gr/setup		\
 	$(UNIT_SRC)/acr			\

userspace/SWUTS.h

@@ -96,6 +96,7 @@
  *   - @ref SWUTS-gr-falcon
  *   - @ref SWUTS-gr-fs-state
  *   - @ref SWUTS-gr-global-ctx
+ *   - @ref SWUTS-gr-ctx
  *   - @ref SWUTS-gr-config
  *
  */

userspace/SWUTS.sources

@@ -67,4 +67,5 @@ INPUT += ../../../userspace/units/gr/intr/nvgpu-gr-intr.h
 INPUT += ../../../userspace/units/gr/intr/nvgpu-gr-falcon.h
 INPUT += ../../../userspace/units/gr/intr/nvgpu-gr-fs-state.h
 INPUT += ../../../userspace/units/gr/intr/nvgpu-gr-global-ctx.h
+INPUT += ../../../userspace/units/gr/intr/nvgpu-gr-ctx.h
 INPUT += ../../../userspace/units/gr/config/nvgpu-gr-config.h

userspace/required_tests.json

@@ -2027,6 +2027,24 @@
         "unit": "nvgpu_gr_global_ctx",
         "test_level": 0
     },
+    {
+        "test": "test_gr_init_setup",
+        "case": "gr_ctx_setup",
+        "unit": "nvgpu_gr_ctx",
+        "test_level": 0
+    },
+    {
+        "test": "test_gr_ctx_error_injection",
+        "case": "gr_ctx_alloc_errors",
+        "unit": "nvgpu_gr_ctx",
+        "test_level": 0
+    },
+    {
+        "test": "test_gr_remove_setup",
+        "case": "gr_ctx_cleanup",
+        "unit": "nvgpu_gr_ctx",
+        "test_level": 0
+    },
     {
         "test": "test_nvgpu_mem_create_from_phys",
         "case": "mem_create_from_phys",

userspace/units/gr/ctx/Makefile

@@ -0,0 +1,33 @@
+# Copyright (c) 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.
+
+.SUFFIXES:
+
+OBJS   = nvgpu-gr-ctx.o
+MODULE = nvgpu-gr-ctx
+
+LIB_PATHS += -lnvgpu-gr
+include ../../Makefile.units
+
+lib$(MODULE).so: nvgpu-gr
+
+nvgpu-gr:
+	$(MAKE) -C ..
+

userspace/units/gr/ctx/Makefile.interface.tmk

@@ -0,0 +1,35 @@
+################################### tell Emacs this is a -*- makefile-gmake -*-
+#
+# Copyright (c) 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.
+#
+# tmake for SW Mobile component makefile
+#
+###############################################################################
+
+NVGPU_UNIT_NAME=nvgpu-gr-ctx
+
+include $(NV_COMPONENT_DIR)/../../Makefile.units.common.interface.tmk
+
+# Local Variables:
+# indent-tabs-mode: t
+# tab-width: 8
+# End:
+# vi: set tabstop=8 noexpandtab:

userspace/units/gr/ctx/Makefile.tmk

@@ -0,0 +1,40 @@
+################################### tell Emacs this is a -*- makefile-gmake -*-
+#
+# Copyright (c) 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.
+#
+# tmake for SW Mobile component makefile
+#
+###############################################################################
+
+NVGPU_UNIT_NAME = nvgpu-gr-ctx
+NVGPU_UNIT_SRCS = nvgpu-gr-ctx.c
+
+NVGPU_UNIT_INTERFACE_DIRS := \
+	$(NV_COMPONENT_DIR)/.. \
+	$(NV_SOURCE)/kernel/nvgpu/drivers/gpu/nvgpu
+
+include $(NV_COMPONENT_DIR)/../../Makefile.units.common.tmk
+
+# Local Variables:
+# indent-tabs-mode: t
+# tab-width: 8
+# End:
+# vi: set tabstop=8 noexpandtab:

userspace/units/gr/ctx/nvgpu-gr-ctx.c

@@ -0,0 +1,217 @@
+/*
+ * Copyright (c) 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 <stdlib.h>
+
+#include <unit/unit.h>
+#include <unit/io.h>
+
+#include <nvgpu/posix/io.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/dma.h>
+#include <nvgpu/gr/gr.h>
+#include <nvgpu/gr/ctx.h>
+
+#include <nvgpu/posix/posix-fault-injection.h>
+#include <nvgpu/posix/dma.h>
+
+#include "common/gr/gr_priv.h"
+#include "common/gr/ctx_priv.h"
+
+#include "../nvgpu-gr.h"
+#include "nvgpu-gr-ctx.h"
+
+#define DUMMY_SIZE	0xF0U
+
+int test_gr_ctx_error_injection(struct unit_module *m,
+		struct gk20a *g, void *args)
+{
+	int err;
+	struct vm_gk20a *vm;
+	struct nvgpu_gr_ctx_desc *desc;
+	struct nvgpu_gr_global_ctx_buffer_desc *global_desc;
+	struct nvgpu_gr_ctx *gr_ctx = NULL;
+	struct nvgpu_posix_fault_inj *dma_fi =
+		nvgpu_dma_alloc_get_fault_injection();
+	struct nvgpu_posix_fault_inj *kmem_fi =
+		nvgpu_kmem_get_fault_injection();
+
+	desc = nvgpu_gr_ctx_desc_alloc(g);
+	if (!desc) {
+		unit_return_fail(m, "failed to allocate memory");
+	}
+
+	vm = nvgpu_vm_init(g, SZ_4K, SZ_4K << 10, (1ULL << 32),
+			(1ULL << 32) + (1ULL << 37), false, false, false,
+			"dummy");
+	if (!vm) {
+		unit_return_fail(m, "failed to allocate VM");
+	}
+
+	/* Try to free gr_ctx before it is allocated. */
+	nvgpu_gr_ctx_free(g, gr_ctx, NULL, NULL);
+
+	gr_ctx = nvgpu_alloc_gr_ctx_struct(g);
+	if (!gr_ctx) {
+		unit_return_fail(m, "failed to allocate memory");
+	}
+
+	/* Context size is not set, so should fail. */
+	err = nvgpu_gr_ctx_alloc(g, gr_ctx, desc, vm);
+	if (err == 0) {
+		unit_return_fail(m, "unexpected success");
+	}
+
+	/* Set the size now, but inject dma allocation failures. */
+	nvgpu_gr_ctx_set_size(desc, NVGPU_GR_CTX_CTX, DUMMY_SIZE);
+	nvgpu_posix_enable_fault_injection(dma_fi, true, 0);
+	err = nvgpu_gr_ctx_alloc(g, gr_ctx, desc, vm);
+	if (err == 0) {
+		unit_return_fail(m, "unexpected success");
+	}
+
+	/* Inject kmem alloc failures to trigger mapping failures */
+	nvgpu_posix_enable_fault_injection(dma_fi, false, 0);
+	nvgpu_posix_enable_fault_injection(kmem_fi, true, 1);
+	err = nvgpu_gr_ctx_alloc(g, gr_ctx, desc, vm);
+	if (err == 0) {
+		unit_return_fail(m, "unexpected success");
+	}
+
+	/* Successful allocation */
+	nvgpu_posix_enable_fault_injection(kmem_fi, false, 0);
+	err = nvgpu_gr_ctx_alloc(g, gr_ctx, desc, vm);
+	if (err != 0) {
+		unit_return_fail(m, "failed to allocate context");
+	}
+
+	/* Try to free patch context before it is allocated. */
+	nvgpu_gr_ctx_free_patch_ctx(g, vm, gr_ctx);
+
+	/* Inject allocation error and allocate patch context */
+	nvgpu_gr_ctx_set_size(desc, NVGPU_GR_CTX_PATCH_CTX, DUMMY_SIZE);
+	nvgpu_posix_enable_fault_injection(dma_fi, true, 0);
+	err = nvgpu_gr_ctx_alloc_patch_ctx(g, gr_ctx, desc, vm);
+	if (err == 0) {
+		unit_return_fail(m, "unexpected success");
+	}
+
+	/* Successful allocation */
+	nvgpu_posix_enable_fault_injection(dma_fi, false, 0);
+	err = nvgpu_gr_ctx_alloc_patch_ctx(g, gr_ctx, desc, vm);
+	if (err != 0) {
+		unit_return_fail(m, "failed to allocate patch context");
+	}
+
+	global_desc = nvgpu_gr_global_ctx_desc_alloc(g);
+	if (!global_desc) {
+		unit_return_fail(m, "failed to allocate desc");
+	}
+
+	err = nvgpu_gr_ctx_map_global_ctx_buffers(g, gr_ctx, global_desc,
+			vm, false);
+	if (err == 0) {
+		unit_return_fail(m, "unexpected success");
+	}
+
+	nvgpu_gr_global_ctx_set_size(global_desc, NVGPU_GR_GLOBAL_CTX_CIRCULAR,
+		DUMMY_SIZE);
+	nvgpu_gr_global_ctx_set_size(global_desc, NVGPU_GR_GLOBAL_CTX_PAGEPOOL,
+		DUMMY_SIZE);
+	nvgpu_gr_global_ctx_set_size(global_desc, NVGPU_GR_GLOBAL_CTX_ATTRIBUTE,
+		DUMMY_SIZE);
+	nvgpu_gr_global_ctx_set_size(global_desc, NVGPU_GR_GLOBAL_CTX_PRIV_ACCESS_MAP,
+		DUMMY_SIZE);
+
+	err = nvgpu_gr_global_ctx_buffer_alloc(g, global_desc);
+	if (err != 0) {
+		unit_return_fail(m, "failed to allocate global buffers");
+	}
+
+	/* Fail global circular buffer mapping */
+	nvgpu_posix_enable_fault_injection(kmem_fi, true, 0);
+	err = nvgpu_gr_ctx_map_global_ctx_buffers(g, gr_ctx, global_desc,
+			vm, false);
+	if (err == 0) {
+		unit_return_fail(m, "unexpected success");
+	}
+
+	/* Fail global attribute buffer mapping */
+	nvgpu_posix_enable_fault_injection(kmem_fi, true, 4);
+	err = nvgpu_gr_ctx_map_global_ctx_buffers(g, gr_ctx, global_desc,
+			vm, false);
+	if (err == 0) {
+		unit_return_fail(m, "unexpected success");
+	}
+
+	/* Fail global pagepool buffer mapping */
+	nvgpu_posix_enable_fault_injection(kmem_fi, true, 8);
+	err = nvgpu_gr_ctx_map_global_ctx_buffers(g, gr_ctx, global_desc,
+			vm, false);
+	if (err == 0) {
+		unit_return_fail(m, "unexpected success");
+	}
+
+	/* Fail global access map buffer mapping */
+	nvgpu_posix_enable_fault_injection(kmem_fi, true, 12);
+	err = nvgpu_gr_ctx_map_global_ctx_buffers(g, gr_ctx, global_desc,
+			vm, false);
+	if (err == 0) {
+		unit_return_fail(m, "unexpected success");
+	}
+
+	/* Successful mapping */
+	nvgpu_posix_enable_fault_injection(kmem_fi, false, 0);
+	err = nvgpu_gr_ctx_map_global_ctx_buffers(g, gr_ctx, global_desc,
+			vm, false);
+	if (err != 0) {
+		unit_return_fail(m, "failed to map global buffers");
+	}
+
+	/* Update the patch buffer */
+	nvgpu_gr_ctx_patch_write_begin(g, gr_ctx, true);
+	/* Increase data count so that patch write fails */
+	gr_ctx->patch_ctx.data_count = 1000;
+	nvgpu_gr_ctx_patch_write(g, gr_ctx, 0, 0, true);
+	/* Restore data count so that patch write passes */
+	gr_ctx->patch_ctx.data_count = 0;
+	nvgpu_gr_ctx_patch_write(g, gr_ctx, 0, 0, true);
+	nvgpu_gr_ctx_patch_write_end(g, gr_ctx, true);
+
+	/* cleanup */
+	nvgpu_gr_ctx_free_patch_ctx(g, vm, gr_ctx);
+	nvgpu_gr_ctx_free(g, gr_ctx, global_desc, vm);
+	nvgpu_free_gr_ctx_struct(g, gr_ctx);
+	nvgpu_gr_ctx_desc_free(g, desc);
+	nvgpu_vm_put(vm);
+
+	return UNIT_SUCCESS;
+}
+
+struct unit_module_test nvgpu_gr_ctx_tests[] = {
+	UNIT_TEST(gr_ctx_setup, test_gr_init_setup, NULL, 0),
+	UNIT_TEST(gr_ctx_alloc_errors, test_gr_ctx_error_injection, NULL, 0),
+	UNIT_TEST(gr_ctx_cleanup, test_gr_remove_setup, NULL, 0),
+};
+
+UNIT_MODULE(nvgpu_gr_ctx, nvgpu_gr_ctx_tests, UNIT_PRIO_NVGPU_TEST);

userspace/units/gr/ctx/nvgpu-gr-ctx.h

@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 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.
+ */
+#ifndef UNIT_NVGPU_GR_CTX_H
+#define UNIT_NVGPU_GR_CTX_H
+
+#include <nvgpu/types.h>
+
+struct gk20a;
+struct unit_module;
+
+/** @addtogroup SWUTS-gr-ctx
+ *  @{
+ *
+ * Software Unit Test Specification for common.gr.ctx
+ */
+
+/**
+ * Test specification for: test_gr_ctx_error_injection.
+ *
+ * Description: Verify error handling in context allocation and mapping path.
+ *
+ * Test Type: Feature based, Error guessing.
+ *
+ * Targets: #nvgpu_gr_ctx_alloc,
+ *          #nvgpu_gr_ctx_free,
+ *          #nvgpu_gr_ctx_desc_alloc,
+ *          #nvgpu_gr_ctx_desc_free,
+ *          #nvgpu_alloc_gr_ctx_struct,
+ *          #nvgpu_free_gr_ctx_struct,
+ *          #nvgpu_gr_ctx_set_size,
+ *          #nvgpu_gr_ctx_alloc_patch_ctx,
+ *          #nvgpu_gr_ctx_free_patch_ctx,
+ *          #nvgpu_gr_ctx_map_global_ctx_buffers,
+ *          #nvgpu_gr_ctx_patch_write_begin,
+ *          #nvgpu_gr_ctx_patch_write,
+ *          #nvgpu_gr_ctx_patch_write_end.
+ *
+ * Input: gr_ctx_setup must have been executed successfully.
+ *
+ * Steps:
+ * - Allocate context descriptor struct.
+ * - Try to free gr_ctx before it is allocated, should fail.
+ * - Try to allocate gr_ctx before size is set, should fail.
+ * - Inject dma allocation failure and try to allocate gr_ctx, should fail.
+ * - Inject kmem allocation failure and try to allocate gr_ctx, should fail.
+ * - Disable error injection and allocate gr_ctx, should pass.
+ * - Try to free patch_ctx before it is allocated, should fail.
+ * - Inject dma allocation failure and try to allocate patch_ctx, should fail.
+ * - Disable error injection and allocate patch_ctx, should pass.
+ * - Setup all the global context buffers.
+ * - Inject kmem allocation failures for each global context buffer mappping,
+ *   should fail.
+ * - Disable error injection and map, should pass.
+ * - Increase data count in patch context beyond max, write should fail.
+ * - Set data count to 0, write should pass.
+ * - Cleanup all the local resources.
+ *
+ * Output: Returns PASS if the steps above were executed successfully. FAIL
+ * otherwise.
+ */
+int test_gr_ctx_error_injection(struct unit_module *m,
+		struct gk20a *g, void *args);
+
+#endif /* UNIT_NVGPU_GR_CTX_H */
+
+/**
+ * @}
+ */
+