drivers/gpu/drm/i915/selftests/i915_gem_evict.c - linux - Git at Google

 /*
  * Copyright © 2016 Intel Corporation
  *
  * 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 (including the next
  * paragraph) 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 "../i915_selftest.h"

 #include "lib_sw_fence.h"
 #include "mock_context.h"
 #include "mock_drm.h"
 #include "mock_gem_device.h"

 static int populate_ggtt(struct drm_i915_private *i915)
 {
 	struct drm_i915_gem_object *obj;
 	u64 size;

 	for (size = 0;
 	     size + I915_GTT_PAGE_SIZE <= i915->ggtt.vm.total;
 	     size += I915_GTT_PAGE_SIZE) {
 		struct i915_vma *vma;

 		obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
 		if (IS_ERR(obj))
 			return PTR_ERR(obj);

 		vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
 		if (IS_ERR(vma))
 			return PTR_ERR(vma);
 	}

 	if (!list_empty(&i915->mm.unbound_list)) {
 		size = 0;
 		list_for_each_entry(obj, &i915->mm.unbound_list, mm.link)
 			size++;

 		pr_err("Found %lld objects unbound!\n", size);
 		return -EINVAL;
 	}

 	if (list_empty(&i915->ggtt.vm.inactive_list)) {
 		pr_err("No objects on the GGTT inactive list!\n");
 		return -EINVAL;
 	}

 	return 0;
 }

 static void unpin_ggtt(struct drm_i915_private *i915)
 {
 	struct i915_vma *vma;

 	list_for_each_entry(vma, &i915->ggtt.vm.inactive_list, vm_link)
 		i915_vma_unpin(vma);
 }

 static void cleanup_objects(struct drm_i915_private *i915)
 {
 	struct drm_i915_gem_object *obj, *on;

 	list_for_each_entry_safe(obj, on, &i915->mm.unbound_list, mm.link)
 		i915_gem_object_put(obj);

 	list_for_each_entry_safe(obj, on, &i915->mm.bound_list, mm.link)
 		i915_gem_object_put(obj);

 	mutex_unlock(&i915->drm.struct_mutex);

 	i915_gem_drain_freed_objects(i915);

 	mutex_lock(&i915->drm.struct_mutex);
 }

 static int igt_evict_something(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
 	struct i915_ggtt *ggtt = &i915->ggtt;
 	int err;

 	/* Fill the GGTT with pinned objects and try to evict one. */

 	err = populate_ggtt(i915);
 	if (err)
 		goto cleanup;

 	/* Everything is pinned, nothing should happen */
 	err = i915_gem_evict_something(&ggtt->vm,
 				       I915_GTT_PAGE_SIZE, 0, 0,
 				       0, U64_MAX,
 				       0);
 	if (err != -ENOSPC) {
 		pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n",
 		       err);
 		goto cleanup;
 	}

 	unpin_ggtt(i915);

 	/* Everything is unpinned, we should be able to evict something */
 	err = i915_gem_evict_something(&ggtt->vm,
 				       I915_GTT_PAGE_SIZE, 0, 0,
 				       0, U64_MAX,
 				       0);
 	if (err) {
 		pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n",
 		       err);
 		goto cleanup;
 	}

 cleanup:
 	cleanup_objects(i915);
 	return err;
 }

 static int igt_overcommit(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
 	int err;

 	/* Fill the GGTT with pinned objects and then try to pin one more.
 	 * We expect it to fail.
 	 */

 	err = populate_ggtt(i915);
 	if (err)
 		goto cleanup;

 	obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
 	if (IS_ERR(obj)) {
 		err = PTR_ERR(obj);
 		goto cleanup;
 	}

 	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
 	if (!IS_ERR(vma) || PTR_ERR(vma) != -ENOSPC) {
 		pr_err("Failed to evict+insert, i915_gem_object_ggtt_pin returned err=%d\n", (int)PTR_ERR(vma));
 		err = -EINVAL;
 		goto cleanup;
 	}

 cleanup:
 	cleanup_objects(i915);
 	return err;
 }

 static int igt_evict_for_vma(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
 	struct i915_ggtt *ggtt = &i915->ggtt;
 	struct drm_mm_node target = {
 		.start = 0,
 		.size = 4096,
 	};
 	int err;

 	/* Fill the GGTT with pinned objects and try to evict a range. */

 	err = populate_ggtt(i915);
 	if (err)
 		goto cleanup;

 	/* Everything is pinned, nothing should happen */
 	err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
 	if (err != -ENOSPC) {
 		pr_err("i915_gem_evict_for_node on a full GGTT returned err=%d\n",
 		       err);
 		goto cleanup;
 	}

 	unpin_ggtt(i915);

 	/* Everything is unpinned, we should be able to evict the node */
 	err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
 	if (err) {
 		pr_err("i915_gem_evict_for_node returned err=%d\n",
 		       err);
 		goto cleanup;
 	}

 cleanup:
 	cleanup_objects(i915);
 	return err;
 }

 static void mock_color_adjust(const struct drm_mm_node *node,
 			      unsigned long color,
 			      u64 *start,
 			      u64 *end)
 {
 }

 static int igt_evict_for_cache_color(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
 	struct i915_ggtt *ggtt = &i915->ggtt;
 	const unsigned long flags = PIN_OFFSET_FIXED;
 	struct drm_mm_node target = {
 		.start = I915_GTT_PAGE_SIZE * 2,
 		.size = I915_GTT_PAGE_SIZE,
 		.color = I915_CACHE_LLC,
 	};
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
 	int err;

 	/* Currently the use of color_adjust is limited to cache domains within
 	 * the ggtt, and so the presence of mm.color_adjust is assumed to be
 	 * i915_gtt_color_adjust throughout our driver, so using a mock color
 	 * adjust will work just fine for our purposes.
 	 */
 	ggtt->vm.mm.color_adjust = mock_color_adjust;

 	obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
 	if (IS_ERR(obj)) {
 		err = PTR_ERR(obj);
 		goto cleanup;
 	}
 	i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);

 	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
 				       I915_GTT_PAGE_SIZE | flags);
 	if (IS_ERR(vma)) {
 		pr_err("[0]i915_gem_object_ggtt_pin failed\n");
 		err = PTR_ERR(vma);
 		goto cleanup;
 	}

 	obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
 	if (IS_ERR(obj)) {
 		err = PTR_ERR(obj);
 		goto cleanup;
 	}
 	i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);

 	/* Neighbouring; same colour - should fit */
 	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
 				       (I915_GTT_PAGE_SIZE * 2) | flags);
 	if (IS_ERR(vma)) {
 		pr_err("[1]i915_gem_object_ggtt_pin failed\n");
 		err = PTR_ERR(vma);
 		goto cleanup;
 	}

 	i915_vma_unpin(vma);

 	/* Remove just the second vma */
 	err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
 	if (err) {
 		pr_err("[0]i915_gem_evict_for_node returned err=%d\n", err);
 		goto cleanup;
 	}

 	/* Attempt to remove the first *pinned* vma, by removing the (empty)
 	 * neighbour -- this should fail.
 	 */
 	target.color = I915_CACHE_L3_LLC;

 	err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
 	if (!err) {
 		pr_err("[1]i915_gem_evict_for_node returned err=%d\n", err);
 		err = -EINVAL;
 		goto cleanup;
 	}

 	err = 0;

 cleanup:
 	unpin_ggtt(i915);
 	cleanup_objects(i915);
 	ggtt->vm.mm.color_adjust = NULL;
 	return err;
 }

 static int igt_evict_vm(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
 	struct i915_ggtt *ggtt = &i915->ggtt;
 	int err;

 	/* Fill the GGTT with pinned objects and try to evict everything. */

 	err = populate_ggtt(i915);
 	if (err)
 		goto cleanup;

 	/* Everything is pinned, nothing should happen */
 	err = i915_gem_evict_vm(&ggtt->vm);
 	if (err) {
 		pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n",
 		       err);
 		goto cleanup;
 	}

 	unpin_ggtt(i915);

 	err = i915_gem_evict_vm(&ggtt->vm);
 	if (err) {
 		pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n",
 		       err);
 		goto cleanup;
 	}

 cleanup:
 	cleanup_objects(i915);
 	return err;
 }

 static int igt_evict_contexts(void *arg)
 {
 	const u64 PRETEND_GGTT_SIZE = 16ull << 20;
 	struct drm_i915_private *i915 = arg;
 	struct intel_engine_cs *engine;
 	enum intel_engine_id id;
 	struct reserved {
 		struct drm_mm_node node;
 		struct reserved *next;
 	} *reserved = NULL;
 	struct drm_mm_node hole;
 	unsigned long count;
 	int err;

 	/*
 	 * The purpose of this test is to verify that we will trigger an
 	 * eviction in the GGTT when constructing a request that requires
 	 * additional space in the GGTT for pinning the context. This space
 	 * is not directly tied to the request so reclaiming it requires
 	 * extra work.
 	 *
 	 * As such this test is only meaningful for full-ppgtt environments
 	 * where the GTT space of the request is separate from the GGTT
 	 * allocation required to build the request.
 	 */
 	if (!USES_FULL_PPGTT(i915))
 		return 0;

 	mutex_lock(&i915->drm.struct_mutex);
 	intel_runtime_pm_get(i915);

 	/* Reserve a block so that we know we have enough to fit a few rq */
 	memset(&hole, 0, sizeof(hole));
 	err = i915_gem_gtt_insert(&i915->ggtt.vm, &hole,
 				  PRETEND_GGTT_SIZE, 0, I915_COLOR_UNEVICTABLE,
 				  0, i915->ggtt.vm.total,
 				  PIN_NOEVICT);
 	if (err)
 		goto out_locked;

 	/* Make the GGTT appear small by filling it with unevictable nodes */
 	count = 0;
 	do {
 		struct reserved *r;

 		r = kcalloc(1, sizeof(*r), GFP_KERNEL);
 		if (!r) {
 			err = -ENOMEM;
 			goto out_locked;
 		}

 		if (i915_gem_gtt_insert(&i915->ggtt.vm, &r->node,
 					1ul << 20, 0, I915_COLOR_UNEVICTABLE,
 					0, i915->ggtt.vm.total,
 					PIN_NOEVICT)) {
 			kfree(r);
 			break;
 		}

 		r->next = reserved;
 		reserved = r;

 		count++;
 	} while (1);
 	drm_mm_remove_node(&hole);
 	mutex_unlock(&i915->drm.struct_mutex);
 	pr_info("Filled GGTT with %lu 1MiB nodes\n", count);

 	/* Overfill the GGTT with context objects and so try to evict one. */
 	for_each_engine(engine, i915, id) {
 		struct i915_sw_fence fence;
 		struct drm_file *file;

 		file = mock_file(i915);
 		if (IS_ERR(file))
 			return PTR_ERR(file);

 		count = 0;
 		mutex_lock(&i915->drm.struct_mutex);
 		onstack_fence_init(&fence);
 		do {
 			struct i915_request *rq;
 			struct i915_gem_context *ctx;

 			ctx = live_context(i915, file);
 			if (!ctx)
 				break;

 			/* We will need some GGTT space for the rq's context */
 			igt_evict_ctl.fail_if_busy = true;
 			rq = i915_request_alloc(engine, ctx);
 			igt_evict_ctl.fail_if_busy = false;

 			if (IS_ERR(rq)) {
 				/* When full, fail_if_busy will trigger EBUSY */
 				if (PTR_ERR(rq) != -EBUSY) {
 					pr_err("Unexpected error from request alloc (ctx hw id %u, on %s): %d\n",
 					       ctx->hw_id, engine->name,
 					       (int)PTR_ERR(rq));
 					err = PTR_ERR(rq);
 				}
 				break;
 			}

 			/* Keep every request/ctx pinned until we are full */
 			err = i915_sw_fence_await_sw_fence_gfp(&rq->submit,
 							       &fence,
 							       GFP_KERNEL);
 			if (err < 0)
 				break;

 			i915_request_add(rq);
 			count++;
 			err = 0;
 		} while(1);
 		mutex_unlock(&i915->drm.struct_mutex);

 		onstack_fence_fini(&fence);
 		pr_info("Submitted %lu contexts/requests on %s\n",
 			count, engine->name);

 		mock_file_free(i915, file);
 		if (err)
 			break;
 	}

 	mutex_lock(&i915->drm.struct_mutex);
 out_locked:
 	while (reserved) {
 		struct reserved *next = reserved->next;

 		drm_mm_remove_node(&reserved->node);
 		kfree(reserved);

 		reserved = next;
 	}
 	if (drm_mm_node_allocated(&hole))
 		drm_mm_remove_node(&hole);
 	intel_runtime_pm_put(i915);
 	mutex_unlock(&i915->drm.struct_mutex);

 	return err;
 }

 int i915_gem_evict_mock_selftests(void)
 {
 	static const struct i915_subtest tests[] = {
 		SUBTEST(igt_evict_something),
 		SUBTEST(igt_evict_for_vma),
 		SUBTEST(igt_evict_for_cache_color),
 		SUBTEST(igt_evict_vm),
 		SUBTEST(igt_overcommit),
 	};
 	struct drm_i915_private *i915;
 	int err;

 	i915 = mock_gem_device();
 	if (!i915)
 		return -ENOMEM;

 	mutex_lock(&i915->drm.struct_mutex);
 	err = i915_subtests(tests, i915);
 	mutex_unlock(&i915->drm.struct_mutex);

 	drm_dev_put(&i915->drm);
 	return err;
 }

 int i915_gem_evict_live_selftests(struct drm_i915_private *i915)
 {
 	static const struct i915_subtest tests[] = {
 		SUBTEST(igt_evict_contexts),
 	};

 	if (i915_terminally_wedged(&i915->gpu_error))
 		return 0;

 	return i915_subtests(tests, i915);
 }
	/*
	* Copyright © 2016 Intel Corporation
	*
	* 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 (including the next
	* paragraph) 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 "../i915_selftest.h"

	#include "lib_sw_fence.h"
	#include "mock_context.h"
	#include "mock_drm.h"
	#include "mock_gem_device.h"

	static int populate_ggtt(struct drm_i915_private *i915)
	{
	struct drm_i915_gem_object *obj;
	u64 size;

	for (size = 0;
	size + I915_GTT_PAGE_SIZE <= i915->ggtt.vm.total;
	size += I915_GTT_PAGE_SIZE) {
	struct i915_vma *vma;

	obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
	if (IS_ERR(obj))
	return PTR_ERR(obj);

	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
	if (IS_ERR(vma))
	return PTR_ERR(vma);
	}

	if (!list_empty(&i915->mm.unbound_list)) {
	size = 0;
	list_for_each_entry(obj, &i915->mm.unbound_list, mm.link)
	size++;

	pr_err("Found %lld objects unbound!\n", size);
	return -EINVAL;
	}

	if (list_empty(&i915->ggtt.vm.inactive_list)) {
	pr_err("No objects on the GGTT inactive list!\n");
	return -EINVAL;
	}

	return 0;
	}

	static void unpin_ggtt(struct drm_i915_private *i915)
	{
	struct i915_vma *vma;

	list_for_each_entry(vma, &i915->ggtt.vm.inactive_list, vm_link)
	i915_vma_unpin(vma);
	}

	static void cleanup_objects(struct drm_i915_private *i915)
	{
	struct drm_i915_gem_object obj, on;

	list_for_each_entry_safe(obj, on, &i915->mm.unbound_list, mm.link)
	i915_gem_object_put(obj);

	list_for_each_entry_safe(obj, on, &i915->mm.bound_list, mm.link)
	i915_gem_object_put(obj);

	mutex_unlock(&i915->drm.struct_mutex);

	i915_gem_drain_freed_objects(i915);

	mutex_lock(&i915->drm.struct_mutex);
	}

	static int igt_evict_something(void *arg)
	{
	struct drm_i915_private *i915 = arg;
	struct i915_ggtt *ggtt = &i915->ggtt;
	int err;

	/* Fill the GGTT with pinned objects and try to evict one. */

	err = populate_ggtt(i915);
	if (err)
	goto cleanup;

	/* Everything is pinned, nothing should happen */
	err = i915_gem_evict_something(&ggtt->vm,
	I915_GTT_PAGE_SIZE, 0, 0,
	0, U64_MAX,
	0);
	if (err != -ENOSPC) {
	pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n",
	err);
	goto cleanup;
	}

	unpin_ggtt(i915);

	/* Everything is unpinned, we should be able to evict something */
	err = i915_gem_evict_something(&ggtt->vm,
	I915_GTT_PAGE_SIZE, 0, 0,
	0, U64_MAX,
	0);
	if (err) {
	pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n",
	err);
	goto cleanup;
	}

	cleanup:
	cleanup_objects(i915);
	return err;
	}

	static int igt_overcommit(void *arg)
	{
	struct drm_i915_private *i915 = arg;
	struct drm_i915_gem_object *obj;
	struct i915_vma *vma;
	int err;

	/* Fill the GGTT with pinned objects and then try to pin one more.
	* We expect it to fail.
	*/

	err = populate_ggtt(i915);
	if (err)
	goto cleanup;

	obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
	if (IS_ERR(obj)) {
	err = PTR_ERR(obj);
	goto cleanup;
	}

	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
	if (!IS_ERR(vma) \|\| PTR_ERR(vma) != -ENOSPC) {
	pr_err("Failed to evict+insert, i915_gem_object_ggtt_pin returned err=%d\n", (int)PTR_ERR(vma));
	err = -EINVAL;
	goto cleanup;
	}

	cleanup:
	cleanup_objects(i915);
	return err;
	}

	static int igt_evict_for_vma(void *arg)
	{
	struct drm_i915_private *i915 = arg;
	struct i915_ggtt *ggtt = &i915->ggtt;
	struct drm_mm_node target = {
	.start = 0,
	.size = 4096,
	};
	int err;

	/* Fill the GGTT with pinned objects and try to evict a range. */

	err = populate_ggtt(i915);
	if (err)
	goto cleanup;

	/* Everything is pinned, nothing should happen */
	err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
	if (err != -ENOSPC) {
	pr_err("i915_gem_evict_for_node on a full GGTT returned err=%d\n",
	err);
	goto cleanup;
	}

	unpin_ggtt(i915);

	/* Everything is unpinned, we should be able to evict the node */
	err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
	if (err) {
	pr_err("i915_gem_evict_for_node returned err=%d\n",
	err);
	goto cleanup;
	}

	cleanup:
	cleanup_objects(i915);
	return err;
	}

	static void mock_color_adjust(const struct drm_mm_node *node,
	unsigned long color,
	u64 *start,
	u64 *end)
	{
	}

	static int igt_evict_for_cache_color(void *arg)
	{
	struct drm_i915_private *i915 = arg;
	struct i915_ggtt *ggtt = &i915->ggtt;
	const unsigned long flags = PIN_OFFSET_FIXED;
	struct drm_mm_node target = {
	.start = I915_GTT_PAGE_SIZE * 2,
	.size = I915_GTT_PAGE_SIZE,
	.color = I915_CACHE_LLC,
	};
	struct drm_i915_gem_object *obj;
	struct i915_vma *vma;
	int err;

	/* Currently the use of color_adjust is limited to cache domains within
	* the ggtt, and so the presence of mm.color_adjust is assumed to be
	* i915_gtt_color_adjust throughout our driver, so using a mock color
	* adjust will work just fine for our purposes.
	*/
	ggtt->vm.mm.color_adjust = mock_color_adjust;

	obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
	if (IS_ERR(obj)) {
	err = PTR_ERR(obj);
	goto cleanup;
	}
	i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);

	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
	I915_GTT_PAGE_SIZE \| flags);
	if (IS_ERR(vma)) {
	pr_err("[0]i915_gem_object_ggtt_pin failed\n");
	err = PTR_ERR(vma);
	goto cleanup;
	}

	obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
	if (IS_ERR(obj)) {
	err = PTR_ERR(obj);
	goto cleanup;
	}
	i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);

	/* Neighbouring; same colour - should fit */
	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
	(I915_GTT_PAGE_SIZE * 2) \| flags);
	if (IS_ERR(vma)) {
	pr_err("[1]i915_gem_object_ggtt_pin failed\n");
	err = PTR_ERR(vma);
	goto cleanup;
	}

	i915_vma_unpin(vma);

	/* Remove just the second vma */
	err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
	if (err) {
	pr_err("[0]i915_gem_evict_for_node returned err=%d\n", err);
	goto cleanup;
	}

	/* Attempt to remove the first pinned vma, by removing the (empty)
	* neighbour -- this should fail.
	*/
	target.color = I915_CACHE_L3_LLC;

	err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
	if (!err) {
	pr_err("[1]i915_gem_evict_for_node returned err=%d\n", err);
	err = -EINVAL;
	goto cleanup;
	}

	err = 0;

	cleanup:
	unpin_ggtt(i915);
	cleanup_objects(i915);
	ggtt->vm.mm.color_adjust = NULL;
	return err;
	}

	static int igt_evict_vm(void *arg)
	{
	struct drm_i915_private *i915 = arg;
	struct i915_ggtt *ggtt = &i915->ggtt;
	int err;

	/* Fill the GGTT with pinned objects and try to evict everything. */

	err = populate_ggtt(i915);
	if (err)
	goto cleanup;

	/* Everything is pinned, nothing should happen */
	err = i915_gem_evict_vm(&ggtt->vm);
	if (err) {
	pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n",
	err);
	goto cleanup;
	}

	unpin_ggtt(i915);

	err = i915_gem_evict_vm(&ggtt->vm);
	if (err) {
	pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n",
	err);
	goto cleanup;
	}

	cleanup:
	cleanup_objects(i915);
	return err;
	}

	static int igt_evict_contexts(void *arg)
	{
	const u64 PRETEND_GGTT_SIZE = 16ull << 20;
	struct drm_i915_private *i915 = arg;
	struct intel_engine_cs *engine;
	enum intel_engine_id id;
	struct reserved {
	struct drm_mm_node node;
	struct reserved *next;
	} *reserved = NULL;
	struct drm_mm_node hole;
	unsigned long count;
	int err;

	/*
	* The purpose of this test is to verify that we will trigger an
	* eviction in the GGTT when constructing a request that requires
	* additional space in the GGTT for pinning the context. This space
	* is not directly tied to the request so reclaiming it requires
	* extra work.
	*
	* As such this test is only meaningful for full-ppgtt environments
	* where the GTT space of the request is separate from the GGTT
	* allocation required to build the request.
	*/
	if (!USES_FULL_PPGTT(i915))
	return 0;

	mutex_lock(&i915->drm.struct_mutex);
	intel_runtime_pm_get(i915);

	/* Reserve a block so that we know we have enough to fit a few rq */
	memset(&hole, 0, sizeof(hole));
	err = i915_gem_gtt_insert(&i915->ggtt.vm, &hole,
	PRETEND_GGTT_SIZE, 0, I915_COLOR_UNEVICTABLE,
	0, i915->ggtt.vm.total,
	PIN_NOEVICT);
	if (err)
	goto out_locked;

	/* Make the GGTT appear small by filling it with unevictable nodes */
	count = 0;
	do {
	struct reserved *r;

	r = kcalloc(1, sizeof(*r), GFP_KERNEL);
	if (!r) {
	err = -ENOMEM;
	goto out_locked;
	}

	if (i915_gem_gtt_insert(&i915->ggtt.vm, &r->node,
	1ul << 20, 0, I915_COLOR_UNEVICTABLE,
	0, i915->ggtt.vm.total,
	PIN_NOEVICT)) {
	kfree(r);
	break;
	}

	r->next = reserved;
	reserved = r;

	count++;
	} while (1);
	drm_mm_remove_node(&hole);
	mutex_unlock(&i915->drm.struct_mutex);
	pr_info("Filled GGTT with %lu 1MiB nodes\n", count);

	/* Overfill the GGTT with context objects and so try to evict one. */
	for_each_engine(engine, i915, id) {
	struct i915_sw_fence fence;
	struct drm_file *file;

	file = mock_file(i915);
	if (IS_ERR(file))
	return PTR_ERR(file);

	count = 0;
	mutex_lock(&i915->drm.struct_mutex);
	onstack_fence_init(&fence);
	do {
	struct i915_request *rq;
	struct i915_gem_context *ctx;

	ctx = live_context(i915, file);
	if (!ctx)
	break;

	/* We will need some GGTT space for the rq's context */
	igt_evict_ctl.fail_if_busy = true;
	rq = i915_request_alloc(engine, ctx);
	igt_evict_ctl.fail_if_busy = false;

	if (IS_ERR(rq)) {
	/* When full, fail_if_busy will trigger EBUSY */
	if (PTR_ERR(rq) != -EBUSY) {
	pr_err("Unexpected error from request alloc (ctx hw id %u, on %s): %d\n",
	ctx->hw_id, engine->name,
	(int)PTR_ERR(rq));
	err = PTR_ERR(rq);
	}
	break;
	}

	/* Keep every request/ctx pinned until we are full */
	err = i915_sw_fence_await_sw_fence_gfp(&rq->submit,
	&fence,
	GFP_KERNEL);
	if (err < 0)
	break;

	i915_request_add(rq);
	count++;
	err = 0;
	} while(1);
	mutex_unlock(&i915->drm.struct_mutex);

	onstack_fence_fini(&fence);
	pr_info("Submitted %lu contexts/requests on %s\n",
	count, engine->name);

	mock_file_free(i915, file);
	if (err)
	break;
	}

	mutex_lock(&i915->drm.struct_mutex);
	out_locked:
	while (reserved) {
	struct reserved *next = reserved->next;

	drm_mm_remove_node(&reserved->node);
	kfree(reserved);

	reserved = next;
	}
	if (drm_mm_node_allocated(&hole))
	drm_mm_remove_node(&hole);
	intel_runtime_pm_put(i915);
	mutex_unlock(&i915->drm.struct_mutex);

	return err;
	}

	int i915_gem_evict_mock_selftests(void)
	{
	static const struct i915_subtest tests[] = {
	SUBTEST(igt_evict_something),
	SUBTEST(igt_evict_for_vma),
	SUBTEST(igt_evict_for_cache_color),
	SUBTEST(igt_evict_vm),
	SUBTEST(igt_overcommit),
	};
	struct drm_i915_private *i915;
	int err;

	i915 = mock_gem_device();
	if (!i915)
	return -ENOMEM;

	mutex_lock(&i915->drm.struct_mutex);
	err = i915_subtests(tests, i915);
	mutex_unlock(&i915->drm.struct_mutex);

	drm_dev_put(&i915->drm);
	return err;
	}

	int i915_gem_evict_live_selftests(struct drm_i915_private *i915)
	{
	static const struct i915_subtest tests[] = {
	SUBTEST(igt_evict_contexts),
	};

	if (i915_terminally_wedged(&i915->gpu_error))
	return 0;

	return i915_subtests(tests, i915);
	}