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Commit f40a7b75 authored by Chris Wilson's avatar Chris Wilson
Browse files

drm/i915: Initial selftests for exercising eviction 



Very simple tests to just ask eviction to find some free space in a full
GTT and one with some available space.

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: default avatarMatthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-41-chris@chris-wilson.co.uk
parent 92fdf8d4

drivers/gpu/drm/i915/i915_gem_evict.c

+4 −0
Original line number Diff line number Diff line
@@ -393,3 +393,7 @@ int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle) 


	return 0;

}



#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)

#include "selftests/i915_gem_evict.c"

#endif

drivers/gpu/drm/i915/selftests/i915_gem_evict.c

0 → 100644
+260 −0
Original line number Diff line number Diff line 
/*

 * 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 "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.base.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, global_link)

			size++;



		pr_err("Found %lld objects unbound!\n", size);

		return -EINVAL;

	}



	if (list_empty(&i915->ggtt.base.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.base.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, global_link)

		i915_gem_object_put(obj);



	list_for_each_entry_safe(obj, on, &i915->mm.bound_list, global_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->base,

				       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->base,

				       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;

	}



	list_move(&obj->global_link, &i915->mm.unbound_list);



	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->base, &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->base, &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 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->base, false);

	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->base, false);

	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;

}



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_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_unref(&i915->drm);

	return err;

}

drivers/gpu/drm/i915/selftests/i915_mock_selftests.h

+1 −0
Original line number Diff line number Diff line
@@ -16,3 +16,4 @@ selftest(requests, i915_gem_request_mock_selftests) 
selftest(objects, i915_gem_object_mock_selftests)

selftest(dmabuf, i915_gem_dmabuf_mock_selftests)

selftest(vma, i915_vma_mock_selftests)

selftest(evict, i915_gem_evict_mock_selftests)