drivers/gpu/drm/i915/selftests/i915_gem_dmabuf.c - hafnium/third_party/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 "mock_gem_device.h"
 #include "mock_dmabuf.h"

 static int igt_dmabuf_export(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
 	struct drm_i915_gem_object *obj;
 	struct dma_buf *dmabuf;

 	obj = i915_gem_object_create(i915, PAGE_SIZE);
 	if (IS_ERR(obj))
 		return PTR_ERR(obj);

 	dmabuf = i915_gem_prime_export(&i915->drm, &obj->base, 0);
 	i915_gem_object_put(obj);
 	if (IS_ERR(dmabuf)) {
 		pr_err("i915_gem_prime_export failed with err=%d\n",
 		       (int)PTR_ERR(dmabuf));
 		return PTR_ERR(dmabuf);
 	}

 	dma_buf_put(dmabuf);
 	return 0;
 }

 static int igt_dmabuf_import_self(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
 	struct drm_i915_gem_object *obj;
 	struct drm_gem_object *import;
 	struct dma_buf *dmabuf;
 	int err;

 	obj = i915_gem_object_create(i915, PAGE_SIZE);
 	if (IS_ERR(obj))
 		return PTR_ERR(obj);

 	dmabuf = i915_gem_prime_export(&i915->drm, &obj->base, 0);
 	if (IS_ERR(dmabuf)) {
 		pr_err("i915_gem_prime_export failed with err=%d\n",
 		       (int)PTR_ERR(dmabuf));
 		err = PTR_ERR(dmabuf);
 		goto out;
 	}

 	import = i915_gem_prime_import(&i915->drm, dmabuf);
 	if (IS_ERR(import)) {
 		pr_err("i915_gem_prime_import failed with err=%d\n",
 		       (int)PTR_ERR(import));
 		err = PTR_ERR(import);
 		goto out_dmabuf;
 	}

 	if (import != &obj->base) {
 		pr_err("i915_gem_prime_import created a new object!\n");
 		err = -EINVAL;
 		goto out_import;
 	}

 	err = 0;
 out_import:
 	i915_gem_object_put(to_intel_bo(import));
 out_dmabuf:
 	dma_buf_put(dmabuf);
 out:
 	i915_gem_object_put(obj);
 	return err;
 }

 static int igt_dmabuf_import(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
 	struct drm_i915_gem_object *obj;
 	struct dma_buf *dmabuf;
 	void *obj_map, *dma_map;
 	u32 pattern[] = { 0, 0xaa, 0xcc, 0x55, 0xff };
 	int err, i;

 	dmabuf = mock_dmabuf(1);
 	if (IS_ERR(dmabuf))
 		return PTR_ERR(dmabuf);

 	obj = to_intel_bo(i915_gem_prime_import(&i915->drm, dmabuf));
 	if (IS_ERR(obj)) {
 		pr_err("i915_gem_prime_import failed with err=%d\n",
 		       (int)PTR_ERR(obj));
 		err = PTR_ERR(obj);
 		goto out_dmabuf;
 	}

 	if (obj->base.dev != &i915->drm) {
 		pr_err("i915_gem_prime_import created a non-i915 object!\n");
 		err = -EINVAL;
 		goto out_obj;
 	}

 	if (obj->base.size != PAGE_SIZE) {
 		pr_err("i915_gem_prime_import is wrong size found %lld, expected %ld\n",
 		       (long long)obj->base.size, PAGE_SIZE);
 		err = -EINVAL;
 		goto out_obj;
 	}

 	dma_map = dma_buf_vmap(dmabuf);
 	if (!dma_map) {
 		pr_err("dma_buf_vmap failed\n");
 		err = -ENOMEM;
 		goto out_obj;
 	}

 	if (0) { /* Can not yet map dmabuf */
 		obj_map = i915_gem_object_pin_map(obj, I915_MAP_WB);
 		if (IS_ERR(obj_map)) {
 			err = PTR_ERR(obj_map);
 			pr_err("i915_gem_object_pin_map failed with err=%d\n", err);
 			goto out_dma_map;
 		}

 		for (i = 0; i < ARRAY_SIZE(pattern); i++) {
 			memset(dma_map, pattern[i], PAGE_SIZE);
 			if (memchr_inv(obj_map, pattern[i], PAGE_SIZE)) {
 				err = -EINVAL;
 				pr_err("imported vmap not all set to %x!\n", pattern[i]);
 				i915_gem_object_unpin_map(obj);
 				goto out_dma_map;
 			}
 		}

 		for (i = 0; i < ARRAY_SIZE(pattern); i++) {
 			memset(obj_map, pattern[i], PAGE_SIZE);
 			if (memchr_inv(dma_map, pattern[i], PAGE_SIZE)) {
 				err = -EINVAL;
 				pr_err("exported vmap not all set to %x!\n", pattern[i]);
 				i915_gem_object_unpin_map(obj);
 				goto out_dma_map;
 			}
 		}

 		i915_gem_object_unpin_map(obj);
 	}

 	err = 0;
 out_dma_map:
 	dma_buf_vunmap(dmabuf, dma_map);
 out_obj:
 	i915_gem_object_put(obj);
 out_dmabuf:
 	dma_buf_put(dmabuf);
 	return err;
 }

 static int igt_dmabuf_import_ownership(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
 	struct drm_i915_gem_object *obj;
 	struct dma_buf *dmabuf;
 	void *ptr;
 	int err;

 	dmabuf = mock_dmabuf(1);
 	if (IS_ERR(dmabuf))
 		return PTR_ERR(dmabuf);

 	ptr = dma_buf_vmap(dmabuf);
 	if (!ptr) {
 		pr_err("dma_buf_vmap failed\n");
 		err = -ENOMEM;
 		goto err_dmabuf;
 	}

 	memset(ptr, 0xc5, PAGE_SIZE);
 	dma_buf_vunmap(dmabuf, ptr);

 	obj = to_intel_bo(i915_gem_prime_import(&i915->drm, dmabuf));
 	if (IS_ERR(obj)) {
 		pr_err("i915_gem_prime_import failed with err=%d\n",
 		       (int)PTR_ERR(obj));
 		err = PTR_ERR(obj);
 		goto err_dmabuf;
 	}

 	dma_buf_put(dmabuf);

 	err = i915_gem_object_pin_pages(obj);
 	if (err) {
 		pr_err("i915_gem_object_pin_pages failed with err=%d\n", err);
 		goto out_obj;
 	}

 	err = 0;
 	i915_gem_object_unpin_pages(obj);
 out_obj:
 	i915_gem_object_put(obj);
 	return err;

 err_dmabuf:
 	dma_buf_put(dmabuf);
 	return err;
 }

 static int igt_dmabuf_export_vmap(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
 	struct drm_i915_gem_object *obj;
 	struct dma_buf *dmabuf;
 	void *ptr;
 	int err;

 	obj = i915_gem_object_create(i915, PAGE_SIZE);
 	if (IS_ERR(obj))
 		return PTR_ERR(obj);

 	dmabuf = i915_gem_prime_export(&i915->drm, &obj->base, 0);
 	if (IS_ERR(dmabuf)) {
 		pr_err("i915_gem_prime_export failed with err=%d\n",
 		       (int)PTR_ERR(dmabuf));
 		err = PTR_ERR(dmabuf);
 		goto err_obj;
 	}
 	i915_gem_object_put(obj);

 	ptr = dma_buf_vmap(dmabuf);
 	if (!ptr) {
 		pr_err("dma_buf_vmap failed\n");
 		err = -ENOMEM;
 		goto out;
 	}

 	if (memchr_inv(ptr, 0, dmabuf->size)) {
 		pr_err("Exported object not initialiased to zero!\n");
 		err = -EINVAL;
 		goto out;
 	}

 	memset(ptr, 0xc5, dmabuf->size);

 	err = 0;
 	dma_buf_vunmap(dmabuf, ptr);
 out:
 	dma_buf_put(dmabuf);
 	return err;

 err_obj:
 	i915_gem_object_put(obj);
 	return err;
 }

 static int igt_dmabuf_export_kmap(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
 	struct drm_i915_gem_object *obj;
 	struct dma_buf *dmabuf;
 	void *ptr;
 	int err;

 	obj = i915_gem_object_create(i915, 2*PAGE_SIZE);
 	if (IS_ERR(obj))
 		return PTR_ERR(obj);

 	dmabuf = i915_gem_prime_export(&i915->drm, &obj->base, 0);
 	i915_gem_object_put(obj);
 	if (IS_ERR(dmabuf)) {
 		err = PTR_ERR(dmabuf);
 		pr_err("i915_gem_prime_export failed with err=%d\n", err);
 		return err;
 	}

 	ptr = dma_buf_kmap(dmabuf, 0);
 	if (!ptr) {
 		pr_err("dma_buf_kmap failed\n");
 		err = -ENOMEM;
 		goto err;
 	}

 	if (memchr_inv(ptr, 0, PAGE_SIZE)) {
 		dma_buf_kunmap(dmabuf, 0, ptr);
 		pr_err("Exported page[0] not initialiased to zero!\n");
 		err = -EINVAL;
 		goto err;
 	}

 	memset(ptr, 0xc5, PAGE_SIZE);
 	dma_buf_kunmap(dmabuf, 0, ptr);

 	ptr = i915_gem_object_pin_map(obj, I915_MAP_WB);
 	if (IS_ERR(ptr)) {
 		err = PTR_ERR(ptr);
 		pr_err("i915_gem_object_pin_map failed with err=%d\n", err);
 		goto err;
 	}
 	memset(ptr + PAGE_SIZE, 0xaa, PAGE_SIZE);
 	i915_gem_object_unpin_map(obj);

 	ptr = dma_buf_kmap(dmabuf, 1);
 	if (!ptr) {
 		pr_err("dma_buf_kmap failed\n");
 		err = -ENOMEM;
 		goto err;
 	}

 	if (memchr_inv(ptr, 0xaa, PAGE_SIZE)) {
 		dma_buf_kunmap(dmabuf, 1, ptr);
 		pr_err("Exported page[1] not set to 0xaa!\n");
 		err = -EINVAL;
 		goto err;
 	}

 	memset(ptr, 0xc5, PAGE_SIZE);
 	dma_buf_kunmap(dmabuf, 1, ptr);

 	ptr = dma_buf_kmap(dmabuf, 0);
 	if (!ptr) {
 		pr_err("dma_buf_kmap failed\n");
 		err = -ENOMEM;
 		goto err;
 	}
 	if (memchr_inv(ptr, 0xc5, PAGE_SIZE)) {
 		dma_buf_kunmap(dmabuf, 0, ptr);
 		pr_err("Exported page[0] did not retain 0xc5!\n");
 		err = -EINVAL;
 		goto err;
 	}
 	dma_buf_kunmap(dmabuf, 0, ptr);

 	ptr = dma_buf_kmap(dmabuf, 2);
 	if (ptr) {
 		pr_err("Erroneously kmapped beyond the end of the object!\n");
 		dma_buf_kunmap(dmabuf, 2, ptr);
 		err = -EINVAL;
 		goto err;
 	}

 	ptr = dma_buf_kmap(dmabuf, -1);
 	if (ptr) {
 		pr_err("Erroneously kmapped before the start of the object!\n");
 		dma_buf_kunmap(dmabuf, -1, ptr);
 		err = -EINVAL;
 		goto err;
 	}

 	err = 0;
 err:
 	dma_buf_put(dmabuf);
 	return err;
 }

 int i915_gem_dmabuf_mock_selftests(void)
 {
 	static const struct i915_subtest tests[] = {
 		SUBTEST(igt_dmabuf_export),
 		SUBTEST(igt_dmabuf_import_self),
 		SUBTEST(igt_dmabuf_import),
 		SUBTEST(igt_dmabuf_import_ownership),
 		SUBTEST(igt_dmabuf_export_vmap),
 		SUBTEST(igt_dmabuf_export_kmap),
 	};
 	struct drm_i915_private *i915;
 	int err;

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

 	err = i915_subtests(tests, i915);

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

 int i915_gem_dmabuf_live_selftests(struct drm_i915_private *i915)
 {
 	static const struct i915_subtest tests[] = {
 		SUBTEST(igt_dmabuf_export),
 	};

 	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 "mock_gem_device.h"
	#include "mock_dmabuf.h"

	static int igt_dmabuf_export(void *arg)
	{
	struct drm_i915_private *i915 = arg;
	struct drm_i915_gem_object *obj;
	struct dma_buf *dmabuf;

	obj = i915_gem_object_create(i915, PAGE_SIZE);
	if (IS_ERR(obj))
	return PTR_ERR(obj);

	dmabuf = i915_gem_prime_export(&i915->drm, &obj->base, 0);
	i915_gem_object_put(obj);
	if (IS_ERR(dmabuf)) {
	pr_err("i915_gem_prime_export failed with err=%d\n",
	(int)PTR_ERR(dmabuf));
	return PTR_ERR(dmabuf);
	}

	dma_buf_put(dmabuf);
	return 0;
	}

	static int igt_dmabuf_import_self(void *arg)
	{
	struct drm_i915_private *i915 = arg;
	struct drm_i915_gem_object *obj;
	struct drm_gem_object *import;
	struct dma_buf *dmabuf;
	int err;

	obj = i915_gem_object_create(i915, PAGE_SIZE);
	if (IS_ERR(obj))
	return PTR_ERR(obj);

	dmabuf = i915_gem_prime_export(&i915->drm, &obj->base, 0);
	if (IS_ERR(dmabuf)) {
	pr_err("i915_gem_prime_export failed with err=%d\n",
	(int)PTR_ERR(dmabuf));
	err = PTR_ERR(dmabuf);
	goto out;
	}

	import = i915_gem_prime_import(&i915->drm, dmabuf);
	if (IS_ERR(import)) {
	pr_err("i915_gem_prime_import failed with err=%d\n",
	(int)PTR_ERR(import));
	err = PTR_ERR(import);
	goto out_dmabuf;
	}

	if (import != &obj->base) {
	pr_err("i915_gem_prime_import created a new object!\n");
	err = -EINVAL;
	goto out_import;
	}

	err = 0;
	out_import:
	i915_gem_object_put(to_intel_bo(import));
	out_dmabuf:
	dma_buf_put(dmabuf);
	out:
	i915_gem_object_put(obj);
	return err;
	}

	static int igt_dmabuf_import(void *arg)
	{
	struct drm_i915_private *i915 = arg;
	struct drm_i915_gem_object *obj;
	struct dma_buf *dmabuf;
	void obj_map, dma_map;
	u32 pattern[] = { 0, 0xaa, 0xcc, 0x55, 0xff };
	int err, i;

	dmabuf = mock_dmabuf(1);
	if (IS_ERR(dmabuf))
	return PTR_ERR(dmabuf);

	obj = to_intel_bo(i915_gem_prime_import(&i915->drm, dmabuf));
	if (IS_ERR(obj)) {
	pr_err("i915_gem_prime_import failed with err=%d\n",
	(int)PTR_ERR(obj));
	err = PTR_ERR(obj);
	goto out_dmabuf;
	}

	if (obj->base.dev != &i915->drm) {
	pr_err("i915_gem_prime_import created a non-i915 object!\n");
	err = -EINVAL;
	goto out_obj;
	}

	if (obj->base.size != PAGE_SIZE) {
	pr_err("i915_gem_prime_import is wrong size found %lld, expected %ld\n",
	(long long)obj->base.size, PAGE_SIZE);
	err = -EINVAL;
	goto out_obj;
	}

	dma_map = dma_buf_vmap(dmabuf);
	if (!dma_map) {
	pr_err("dma_buf_vmap failed\n");
	err = -ENOMEM;
	goto out_obj;
	}

	if (0) { /* Can not yet map dmabuf */
	obj_map = i915_gem_object_pin_map(obj, I915_MAP_WB);
	if (IS_ERR(obj_map)) {
	err = PTR_ERR(obj_map);
	pr_err("i915_gem_object_pin_map failed with err=%d\n", err);
	goto out_dma_map;
	}

	for (i = 0; i < ARRAY_SIZE(pattern); i++) {
	memset(dma_map, pattern[i], PAGE_SIZE);
	if (memchr_inv(obj_map, pattern[i], PAGE_SIZE)) {
	err = -EINVAL;
	pr_err("imported vmap not all set to %x!\n", pattern[i]);
	i915_gem_object_unpin_map(obj);
	goto out_dma_map;
	}
	}

	for (i = 0; i < ARRAY_SIZE(pattern); i++) {
	memset(obj_map, pattern[i], PAGE_SIZE);
	if (memchr_inv(dma_map, pattern[i], PAGE_SIZE)) {
	err = -EINVAL;
	pr_err("exported vmap not all set to %x!\n", pattern[i]);
	i915_gem_object_unpin_map(obj);
	goto out_dma_map;
	}
	}

	i915_gem_object_unpin_map(obj);
	}

	err = 0;
	out_dma_map:
	dma_buf_vunmap(dmabuf, dma_map);
	out_obj:
	i915_gem_object_put(obj);
	out_dmabuf:
	dma_buf_put(dmabuf);
	return err;
	}

	static int igt_dmabuf_import_ownership(void *arg)
	{
	struct drm_i915_private *i915 = arg;
	struct drm_i915_gem_object *obj;
	struct dma_buf *dmabuf;
	void *ptr;
	int err;

	dmabuf = mock_dmabuf(1);
	if (IS_ERR(dmabuf))
	return PTR_ERR(dmabuf);

	ptr = dma_buf_vmap(dmabuf);
	if (!ptr) {
	pr_err("dma_buf_vmap failed\n");
	err = -ENOMEM;
	goto err_dmabuf;
	}

	memset(ptr, 0xc5, PAGE_SIZE);
	dma_buf_vunmap(dmabuf, ptr);

	obj = to_intel_bo(i915_gem_prime_import(&i915->drm, dmabuf));
	if (IS_ERR(obj)) {
	pr_err("i915_gem_prime_import failed with err=%d\n",
	(int)PTR_ERR(obj));
	err = PTR_ERR(obj);
	goto err_dmabuf;
	}

	dma_buf_put(dmabuf);

	err = i915_gem_object_pin_pages(obj);
	if (err) {
	pr_err("i915_gem_object_pin_pages failed with err=%d\n", err);
	goto out_obj;
	}

	err = 0;
	i915_gem_object_unpin_pages(obj);
	out_obj:
	i915_gem_object_put(obj);
	return err;

	err_dmabuf:
	dma_buf_put(dmabuf);
	return err;
	}

	static int igt_dmabuf_export_vmap(void *arg)
	{
	struct drm_i915_private *i915 = arg;
	struct drm_i915_gem_object *obj;
	struct dma_buf *dmabuf;
	void *ptr;
	int err;

	obj = i915_gem_object_create(i915, PAGE_SIZE);
	if (IS_ERR(obj))
	return PTR_ERR(obj);

	dmabuf = i915_gem_prime_export(&i915->drm, &obj->base, 0);
	if (IS_ERR(dmabuf)) {
	pr_err("i915_gem_prime_export failed with err=%d\n",
	(int)PTR_ERR(dmabuf));
	err = PTR_ERR(dmabuf);
	goto err_obj;
	}
	i915_gem_object_put(obj);

	ptr = dma_buf_vmap(dmabuf);
	if (!ptr) {
	pr_err("dma_buf_vmap failed\n");
	err = -ENOMEM;
	goto out;
	}

	if (memchr_inv(ptr, 0, dmabuf->size)) {
	pr_err("Exported object not initialiased to zero!\n");
	err = -EINVAL;
	goto out;
	}

	memset(ptr, 0xc5, dmabuf->size);

	err = 0;
	dma_buf_vunmap(dmabuf, ptr);
	out:
	dma_buf_put(dmabuf);
	return err;

	err_obj:
	i915_gem_object_put(obj);
	return err;
	}

	static int igt_dmabuf_export_kmap(void *arg)
	{
	struct drm_i915_private *i915 = arg;
	struct drm_i915_gem_object *obj;
	struct dma_buf *dmabuf;
	void *ptr;
	int err;

	obj = i915_gem_object_create(i915, 2*PAGE_SIZE);
	if (IS_ERR(obj))
	return PTR_ERR(obj);

	dmabuf = i915_gem_prime_export(&i915->drm, &obj->base, 0);
	i915_gem_object_put(obj);
	if (IS_ERR(dmabuf)) {
	err = PTR_ERR(dmabuf);
	pr_err("i915_gem_prime_export failed with err=%d\n", err);
	return err;
	}

	ptr = dma_buf_kmap(dmabuf, 0);
	if (!ptr) {
	pr_err("dma_buf_kmap failed\n");
	err = -ENOMEM;
	goto err;
	}

	if (memchr_inv(ptr, 0, PAGE_SIZE)) {
	dma_buf_kunmap(dmabuf, 0, ptr);
	pr_err("Exported page[0] not initialiased to zero!\n");
	err = -EINVAL;
	goto err;
	}

	memset(ptr, 0xc5, PAGE_SIZE);
	dma_buf_kunmap(dmabuf, 0, ptr);

	ptr = i915_gem_object_pin_map(obj, I915_MAP_WB);
	if (IS_ERR(ptr)) {
	err = PTR_ERR(ptr);
	pr_err("i915_gem_object_pin_map failed with err=%d\n", err);
	goto err;
	}
	memset(ptr + PAGE_SIZE, 0xaa, PAGE_SIZE);
	i915_gem_object_unpin_map(obj);

	ptr = dma_buf_kmap(dmabuf, 1);
	if (!ptr) {
	pr_err("dma_buf_kmap failed\n");
	err = -ENOMEM;
	goto err;
	}

	if (memchr_inv(ptr, 0xaa, PAGE_SIZE)) {
	dma_buf_kunmap(dmabuf, 1, ptr);
	pr_err("Exported page[1] not set to 0xaa!\n");
	err = -EINVAL;
	goto err;
	}

	memset(ptr, 0xc5, PAGE_SIZE);
	dma_buf_kunmap(dmabuf, 1, ptr);

	ptr = dma_buf_kmap(dmabuf, 0);
	if (!ptr) {
	pr_err("dma_buf_kmap failed\n");
	err = -ENOMEM;
	goto err;
	}
	if (memchr_inv(ptr, 0xc5, PAGE_SIZE)) {
	dma_buf_kunmap(dmabuf, 0, ptr);
	pr_err("Exported page[0] did not retain 0xc5!\n");
	err = -EINVAL;
	goto err;
	}
	dma_buf_kunmap(dmabuf, 0, ptr);

	ptr = dma_buf_kmap(dmabuf, 2);
	if (ptr) {
	pr_err("Erroneously kmapped beyond the end of the object!\n");
	dma_buf_kunmap(dmabuf, 2, ptr);
	err = -EINVAL;
	goto err;
	}

	ptr = dma_buf_kmap(dmabuf, -1);
	if (ptr) {
	pr_err("Erroneously kmapped before the start of the object!\n");
	dma_buf_kunmap(dmabuf, -1, ptr);
	err = -EINVAL;
	goto err;
	}

	err = 0;
	err:
	dma_buf_put(dmabuf);
	return err;
	}

	int i915_gem_dmabuf_mock_selftests(void)
	{
	static const struct i915_subtest tests[] = {
	SUBTEST(igt_dmabuf_export),
	SUBTEST(igt_dmabuf_import_self),
	SUBTEST(igt_dmabuf_import),
	SUBTEST(igt_dmabuf_import_ownership),
	SUBTEST(igt_dmabuf_export_vmap),
	SUBTEST(igt_dmabuf_export_kmap),
	};
	struct drm_i915_private *i915;
	int err;

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

	err = i915_subtests(tests, i915);

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

	int i915_gem_dmabuf_live_selftests(struct drm_i915_private *i915)
	{
	static const struct i915_subtest tests[] = {
	SUBTEST(igt_dmabuf_export),
	};

	return i915_subtests(tests, i915);
	}