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         err = i915_gem_object_attach_phys(obj, PAGE_SIZE);
  29         if (err) {
  30                 pr_err("i915_gem_object_attach_phys failed, err=%d\n", err);
  31                 goto out_obj;
  32         }
  33
  34         if (obj->ops != &i915_gem_phys_ops) {
  35                 pr_err("i915_gem_object_attach_phys did not create a phys object\n");
  36                 err = -EINVAL;
  37                 goto out_obj;
  38         }
  39
  40         if (!atomic_read(&obj->mm.pages_pin_count)) {
  41                 pr_err("i915_gem_object_attach_phys did not pin its phys pages\n");
  42                 err = -EINVAL;
  43                 goto out_obj;
  44         }
  45
  46         /* Make the object dirty so that put_pages must do copy back the data */
  47         i915_gem_object_lock(obj, NULL);
  48         err = i915_gem_object_set_to_gtt_domain(obj, true);
  49         i915_gem_object_unlock(obj);
  50         if (err) {
  51                 pr_err("i915_gem_object_set_to_gtt_domain failed with err=%d\n",
  52                        err);
  53                 goto out_obj;
  54         }
  55
  56 out_obj:
  57         i915_gem_object_put(obj);
  58 out:
  59         return err;
  60 }
  61
  62 int i915_gem_phys_mock_selftests(void)
  63 {
  64         static const struct i915_subtest tests[] = {
  65                 SUBTEST(mock_phys_object),
  66         };
  67         struct drm_i915_private *i915;
  68         int err;
  69
  70         i915 = mock_gem_device();
  71         if (!i915)
  72                 return -ENOMEM;
  73
  74         err = i915_subtests(tests, i915);
  75
  76         mock_destroy_device(i915);
  77         return err;
  78 }