cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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i915_gem_phys.c (1905B)

      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
     11static 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
     65out_obj:
     66	i915_gem_object_put(obj);
     67out:
     68	return err;
     69}
     70
     71int 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}