1// SPDX-License-Identifier: MIT
2/*
3 * Copyright �� 2019-2021 Intel Corporation
4 */
5
6#include <drm/ttm/ttm_placement.h>
7#include <linux/scatterlist.h>
8
9#include "gem/i915_gem_region.h"
10#include "intel_memory_region.h"
11#include "intel_region_ttm.h"
12
13#include "mock_region.h"
14
15static void mock_region_put_pages(struct drm_i915_gem_object *obj,
16				  struct sg_table *pages)
17{
18	i915_refct_sgt_put(obj->mm.rsgt);
19	obj->mm.rsgt = NULL;
20	intel_region_ttm_resource_free(obj->mm.region, obj->mm.res);
21}
22
23static int mock_region_get_pages(struct drm_i915_gem_object *obj)
24{
25	struct sg_table *pages;
26	int err;
27
28	obj->mm.res = intel_region_ttm_resource_alloc(obj->mm.region,
29						      obj->bo_offset,
30						      obj->base.size,
31						      obj->flags);
32	if (IS_ERR(obj->mm.res))
33		return PTR_ERR(obj->mm.res);
34
35	obj->mm.rsgt = intel_region_ttm_resource_to_rsgt(obj->mm.region,
36							 obj->mm.res,
37							 obj->mm.region->min_page_size);
38	if (IS_ERR(obj->mm.rsgt)) {
39		err = PTR_ERR(obj->mm.rsgt);
40		goto err_free_resource;
41	}
42
43	pages = &obj->mm.rsgt->table;
44	__i915_gem_object_set_pages(obj, pages);
45
46	return 0;
47
48err_free_resource:
49	intel_region_ttm_resource_free(obj->mm.region, obj->mm.res);
50	return err;
51}
52
53static const struct drm_i915_gem_object_ops mock_region_obj_ops = {
54	.name = "mock-region",
55	.get_pages = mock_region_get_pages,
56	.put_pages = mock_region_put_pages,
57	.release = i915_gem_object_release_memory_region,
58};
59
60static int mock_object_init(struct intel_memory_region *mem,
61			    struct drm_i915_gem_object *obj,
62			    resource_size_t offset,
63			    resource_size_t size,
64			    resource_size_t page_size,
65			    unsigned int flags)
66{
67	static struct lock_class_key lock_class;
68	struct drm_i915_private *i915 = mem->i915;
69
70	if (size > resource_size(&mem->region))
71		return -E2BIG;
72
73	drm_gem_private_object_init(&i915->drm, &obj->base, size);
74	i915_gem_object_init(obj, &mock_region_obj_ops, &lock_class, flags);
75
76	obj->bo_offset = offset;
77
78	obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
79
80	i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
81
82	i915_gem_object_init_memory_region(obj, mem);
83
84	return 0;
85}
86
87static int mock_region_fini(struct intel_memory_region *mem)
88{
89	struct drm_i915_private *i915 = mem->i915;
90	int instance = mem->instance;
91	int ret;
92
93	ret = intel_region_ttm_fini(mem);
94	ida_free(&i915->selftest.mock_region_instances, instance);
95
96	return ret;
97}
98
99static const struct intel_memory_region_ops mock_region_ops = {
100	.init = intel_region_ttm_init,
101	.release = mock_region_fini,
102	.init_object = mock_object_init,
103};
104
105struct intel_memory_region *
106mock_region_create(struct drm_i915_private *i915,
107		   resource_size_t start,
108		   resource_size_t size,
109		   resource_size_t min_page_size,
110		   resource_size_t io_start,
111		   resource_size_t io_size)
112{
113	int instance = ida_alloc_max(&i915->selftest.mock_region_instances,
114				     TTM_NUM_MEM_TYPES - TTM_PL_PRIV - 1,
115				     GFP_KERNEL);
116
117	if (instance < 0)
118		return ERR_PTR(instance);
119
120	return intel_memory_region_create(i915, start, size, min_page_size,
121					  io_start, io_size,
122					  INTEL_MEMORY_MOCK, instance,
123					  &mock_region_ops);
124}
125