1 /* SPDX-License-Identifier: MIT */
2 /*
3 * Copyright © 2021 Intel Corporation
4 */
5 #ifndef _I915_GEM_TTM_H_
6 #define _I915_GEM_TTM_H_
7
8 #include <drm/ttm/ttm_placement.h>
9
10 #include "gem/i915_gem_object_types.h"
11
12 /**
13 * i915_gem_to_ttm - Convert a struct drm_i915_gem_object to a
14 * struct ttm_buffer_object.
15 * @obj: Pointer to the gem object.
16 *
17 * Return: Pointer to the embedded struct ttm_buffer_object.
18 */
19 static inline struct ttm_buffer_object *
i915_gem_to_ttm(struct drm_i915_gem_object * obj)20 i915_gem_to_ttm(struct drm_i915_gem_object *obj)
21 {
22 return &obj->__do_not_access;
23 }
24
25 /*
26 * i915 ttm gem object destructor. Internal use only.
27 */
28 void i915_ttm_bo_destroy(struct ttm_buffer_object *bo);
29
30 /**
31 * i915_ttm_is_ghost_object - Check if the ttm bo is a ghost object.
32 * @bo: Pointer to the ttm buffer object
33 *
34 * Return: True if the ttm bo is not a i915 object but a ghost ttm object,
35 * False otherwise.
36 */
i915_ttm_is_ghost_object(struct ttm_buffer_object * bo)37 static inline bool i915_ttm_is_ghost_object(struct ttm_buffer_object *bo)
38 {
39 return bo->destroy != i915_ttm_bo_destroy;
40 }
41
42 /**
43 * i915_ttm_to_gem - Convert a struct ttm_buffer_object to an embedding
44 * struct drm_i915_gem_object.
45 * @bo: Pointer to the ttm buffer object
46 *
47 * Return: Pointer to the embedding struct drm_i915_gem_object.
48 */
49 static inline struct drm_i915_gem_object *
i915_ttm_to_gem(struct ttm_buffer_object * bo)50 i915_ttm_to_gem(struct ttm_buffer_object *bo)
51 {
52 return container_of(bo, struct drm_i915_gem_object, __do_not_access);
53 }
54
55 int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
56 struct drm_i915_gem_object *obj,
57 resource_size_t offset,
58 resource_size_t size,
59 resource_size_t page_size,
60 unsigned int flags);
61
62 /* Internal I915 TTM declarations and definitions below. */
63
64 #define I915_PL_LMEM0 TTM_PL_PRIV
65 #define I915_PL_SYSTEM TTM_PL_SYSTEM
66 #define I915_PL_STOLEN TTM_PL_VRAM
67 #define I915_PL_GGTT TTM_PL_TT
68
69 struct ttm_placement *i915_ttm_sys_placement(void);
70
71 void i915_ttm_free_cached_io_rsgt(struct drm_i915_gem_object *obj);
72
73 struct i915_refct_sgt *
74 i915_ttm_resource_get_st(struct drm_i915_gem_object *obj,
75 struct ttm_resource *res);
76
77 void i915_ttm_adjust_lru(struct drm_i915_gem_object *obj);
78
79 int i915_ttm_purge(struct drm_i915_gem_object *obj);
80
81 /**
82 * i915_ttm_gtt_binds_lmem - Should the memory be viewed as LMEM by the GTT?
83 * @mem: struct ttm_resource representing the memory.
84 *
85 * Return: true if memory should be viewed as LMEM for GTT binding purposes,
86 * false otherwise.
87 */
i915_ttm_gtt_binds_lmem(struct ttm_resource * mem)88 static inline bool i915_ttm_gtt_binds_lmem(struct ttm_resource *mem)
89 {
90 return mem->mem_type != I915_PL_SYSTEM;
91 }
92
93 /**
94 * i915_ttm_cpu_maps_iomem - Should the memory be viewed as IOMEM by the CPU?
95 * @mem: struct ttm_resource representing the memory.
96 *
97 * Return: true if memory should be viewed as IOMEM for CPU mapping purposes.
98 */
i915_ttm_cpu_maps_iomem(struct ttm_resource * mem)99 static inline bool i915_ttm_cpu_maps_iomem(struct ttm_resource *mem)
100 {
101 /* Once / if we support GGTT, this is also false for cached ttm_tts */
102 return mem && mem->mem_type != I915_PL_SYSTEM;
103 }
104
105 bool i915_ttm_resource_mappable(struct ttm_resource *res);
106
107 #endif
108