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 
15 static 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 
23 static 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 
48 err_free_resource:
49 	intel_region_ttm_resource_free(obj->mm.region, obj->mm.res);
50 	return err;
51 }
52 
53 static 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 
60 static 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 
87 static 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 
99 static 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 
105 struct intel_memory_region *
106 mock_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