Quelle  i915_gem_phys.c   Sprache: C

/*
 * SPDX-License-Identifier: MIT
 *
 * Copyright © 2016 Intel Corporation
 */

#include "i915_selftest.h"

#include "selftests/mock_gem_device.h"

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

 /* Create an object and bind it to a contiguous set of physical pages,
 * i.e. exercise the i915_gem_object_phys API.
 */

 obj = i915_gem_object_create_shmem(i915, PAGE_SIZE);
 if (IS_ERR(obj)) {
  err = PTR_ERR(obj);
  pr_err("i915_gem_object_create failed, err=%d\n", err);
  goto out;
 }

 i915_gem_object_lock(obj, NULL);
 if (!i915_gem_object_has_struct_page(obj)) {
  i915_gem_object_unlock(obj);
  err = -EINVAL;
  pr_err("shmem has no struct page\n");
  goto out_obj;
 }

 err = i915_gem_object_attach_phys(obj, PAGE_SIZE);
 i915_gem_object_unlock(obj);
 if (err) {
  pr_err("i915_gem_object_attach_phys failed, err=%d\n", err);
  goto out_obj;
 }

 if (i915_gem_object_has_struct_page(obj)) {
  pr_err("i915_gem_object_attach_phys did not create a phys object\n");
  err = -EINVAL;
  goto out_obj;
 }

 if (!atomic_read(&obj->mm.pages_pin_count)) {
  pr_err("i915_gem_object_attach_phys did not pin its phys pages\n");
  err = -EINVAL;
  goto out_obj;
 }

 /* Make the object dirty so that put_pages must do copy back the data */
 i915_gem_object_lock(obj, NULL);
 err = i915_gem_object_set_to_gtt_domain(obj, true);
 i915_gem_object_unlock(obj);
 if (err) {
  pr_err("i915_gem_object_set_to_gtt_domain failed with err=%d\n",
         err);
  goto out_obj;
 }

out_obj:
 i915_gem_object_put(obj);
out:
 return err;
}

int i915_gem_phys_mock_selftests(void)
{
 static const struct i915_subtest tests[] = {
  SUBTEST(mock_phys_object),
 };
 struct drm_i915_private *i915;
 int err;

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

 err = i915_subtests(tests, i915);

 mock_destroy_device(i915);
 return err;
}