drivers/gpu/drm/i915/gem/selftests/i915_gem_phys.c

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright © 2016 Intel Corporation
   5  */
   6
   7 #include "i915_selftest.h"
   8
   9 #include "selftests/mock_gem_device.h"
  10
  11 static int mock_phys_object(void *arg)
  12 {
  13         struct drm_i915_private *i915 = arg;
  14         struct drm_i915_gem_object *obj;
  15         int err;
  16
  17         /* Create an object and bind it to a contiguous set of physical pages,
  18          * i.e. exercise the i915_gem_object_phys API.
  19          */
  20
  21         obj = i915_gem_object_create_shmem(i915, PAGE_SIZE);
  22         if (IS_ERR(obj)) {
  23                 err = PTR_ERR(obj);
  24                 pr_err("i915_gem_object_create failed, err=%d\n", err);
  25                 goto out;
  26         }
  27
  28         i915_gem_object_lock(obj, NULL);
  29         if (!i915_gem_object_has_struct_page(obj)) {
  30                 i915_gem_object_unlock(obj);
  31                 err = -EINVAL;
  32                 pr_err("shmem has no struct page\n");
  33                 goto out_obj;
  34         }
  35
  36         err = i915_gem_object_attach_phys(obj, PAGE_SIZE);
  37         i915_gem_object_unlock(obj);
  38         if (err) {
  39                 pr_err("i915_gem_object_attach_phys failed, err=%d\n", err);
  40                 goto out_obj;
  41         }
  42
  43         if (i915_gem_object_has_struct_page(obj)) {
  44                 pr_err("i915_gem_object_attach_phys did not create a phys object\n");
  45                 err = -EINVAL;
  46                 goto out_obj;
  47         }
  48
  49         if (!atomic_read(&obj->mm.pages_pin_count)) {
  50                 pr_err("i915_gem_object_attach_phys did not pin its phys pages\n");
  51                 err = -EINVAL;
  52                 goto out_obj;
  53         }
  54
  55         /* Make the object dirty so that put_pages must do copy back the data */
  56         i915_gem_object_lock(obj, NULL);
  57         err = i915_gem_object_set_to_gtt_domain(obj, true);
  58         i915_gem_object_unlock(obj);
  59         if (err) {
  60                 pr_err("i915_gem_object_set_to_gtt_domain failed with err=%d\n",
  61                        err);
  62                 goto out_obj;
  63         }
  64
  65 out_obj:
  66         i915_gem_object_put(obj);
  67 out:
  68         return err;
  69 }
  70
  71 int i915_gem_phys_mock_selftests(void)
  72 {
  73         static const struct i915_subtest tests[] = {
  74                 SUBTEST(mock_phys_object),
  75         };
  76         struct drm_i915_private *i915;
  77         int err;
  78
  79         i915 = mock_gem_device();
  80         if (!i915)
  81                 return -ENOMEM;
  82
  83         err = i915_subtests(tests, i915);
  84
  85         mock_destroy_device(i915);
  86         return err;
  87 }