1 /*
2 * Copyright 2020 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Christian König
23 */
24
25 #ifndef _TTM_RESOURCE_H_
26 #define _TTM_RESOURCE_H_
27
28 #include <linux/types.h>
29 #include <linux/mutex.h>
30 #include <linux/dma-fence.h>
31 #include <drm/drm_print.h>
32
33 #define TTM_MAX_BO_PRIORITY 4U
34
35 struct ttm_bo_device;
36 struct ttm_resource_manager;
37 struct ttm_resource;
38 struct ttm_place;
39 struct ttm_buffer_object;
40
41 struct ttm_resource_manager_func {
42 /**
43 * struct ttm_resource_manager_func member alloc
44 *
45 * @man: Pointer to a memory type manager.
46 * @bo: Pointer to the buffer object we're allocating space for.
47 * @placement: Placement details.
48 * @flags: Additional placement flags.
49 * @mem: Pointer to a struct ttm_resource to be filled in.
50 *
51 * This function should allocate space in the memory type managed
52 * by @man. Placement details if
53 * applicable are given by @placement. If successful,
54 * @mem::mm_node should be set to a non-null value, and
55 * @mem::start should be set to a value identifying the beginning
56 * of the range allocated, and the function should return zero.
57 * If the memory region accommodate the buffer object, @mem::mm_node
58 * should be set to NULL, and the function should return 0.
59 * If a system error occurred, preventing the request to be fulfilled,
60 * the function should return a negative error code.
61 *
62 * Note that @mem::mm_node will only be dereferenced by
63 * struct ttm_resource_manager functions and optionally by the driver,
64 * which has knowledge of the underlying type.
65 *
66 * This function may not be called from within atomic context, so
67 * an implementation can and must use either a mutex or a spinlock to
68 * protect any data structures managing the space.
69 */
70 int (*alloc)(struct ttm_resource_manager *man,
71 struct ttm_buffer_object *bo,
72 const struct ttm_place *place,
73 struct ttm_resource *mem);
74
75 /**
76 * struct ttm_resource_manager_func member free
77 *
78 * @man: Pointer to a memory type manager.
79 * @mem: Pointer to a struct ttm_resource to be filled in.
80 *
81 * This function frees memory type resources previously allocated
82 * and that are identified by @mem::mm_node and @mem::start. May not
83 * be called from within atomic context.
84 */
85 void (*free)(struct ttm_resource_manager *man,
86 struct ttm_resource *mem);
87
88 /**
89 * struct ttm_resource_manager_func member debug
90 *
91 * @man: Pointer to a memory type manager.
92 * @printer: Prefix to be used in printout to identify the caller.
93 *
94 * This function is called to print out the state of the memory
95 * type manager to aid debugging of out-of-memory conditions.
96 * It may not be called from within atomic context.
97 */
98 void (*debug)(struct ttm_resource_manager *man,
99 struct drm_printer *printer);
100 };
101
102 /**
103 * struct ttm_resource_manager
104 *
105 * @use_type: The memory type is enabled.
106 * @flags: TTM_MEMTYPE_XX flags identifying the traits of the memory
107 * managed by this memory type.
108 * @gpu_offset: If used, the GPU offset of the first managed page of
109 * fixed memory or the first managed location in an aperture.
110 * @size: Size of the managed region.
111 * @func: structure pointer implementing the range manager. See above
112 * @move_lock: lock for move fence
113 * static information. bdev::driver::io_mem_free is never used.
114 * @lru: The lru list for this memory type.
115 * @move: The fence of the last pipelined move operation.
116 *
117 * This structure is used to identify and manage memory types for a device.
118 */
119 struct ttm_resource_manager {
120 /*
121 * No protection. Constant from start.
122 */
123 bool use_type;
124 bool use_tt;
125 uint64_t size;
126 const struct ttm_resource_manager_func *func;
127 spinlock_t move_lock;
128
129 /*
130 * Protected by the global->lru_lock.
131 */
132
133 struct list_head lru[TTM_MAX_BO_PRIORITY];
134
135 /*
136 * Protected by @move_lock.
137 */
138 struct dma_fence *move;
139 };
140
141 /**
142 * struct ttm_bus_placement
143 *
144 * @addr: mapped virtual address
145 * @offset: physical addr
146 * @is_iomem: is this io memory ?
147 *
148 * Structure indicating the bus placement of an object.
149 */
150 struct ttm_bus_placement {
151 void *addr;
152 phys_addr_t offset;
153 bool is_iomem;
154 };
155
156 /**
157 * struct ttm_resource
158 *
159 * @mm_node: Memory manager node.
160 * @size: Requested size of memory region.
161 * @num_pages: Actual size of memory region in pages.
162 * @page_alignment: Page alignment.
163 * @placement: Placement flags.
164 * @bus: Placement on io bus accessible to the CPU
165 *
166 * Structure indicating the placement and space resources used by a
167 * buffer object.
168 */
169 struct ttm_resource {
170 void *mm_node;
171 unsigned long start;
172 unsigned long size;
173 unsigned long num_pages;
174 uint32_t page_alignment;
175 uint32_t mem_type;
176 uint32_t placement;
177 struct ttm_bus_placement bus;
178 };
179
180 /**
181 * ttm_resource_manager_set_used
182 *
183 * @man: A memory manager object.
184 * @used: usage state to set.
185 *
186 * Set the manager in use flag. If disabled the manager is no longer
187 * used for object placement.
188 */
189 static inline void
ttm_resource_manager_set_used(struct ttm_resource_manager * man,bool used)190 ttm_resource_manager_set_used(struct ttm_resource_manager *man, bool used)
191 {
192 man->use_type = used;
193 }
194
195 /**
196 * ttm_resource_manager_used
197 *
198 * @man: Manager to get used state for
199 *
200 * Get the in use flag for a manager.
201 * Returns:
202 * true is used, false if not.
203 */
ttm_resource_manager_used(struct ttm_resource_manager * man)204 static inline bool ttm_resource_manager_used(struct ttm_resource_manager *man)
205 {
206 return man->use_type;
207 }
208
209 /**
210 * ttm_resource_manager_cleanup
211 *
212 * @man: A memory manager object.
213 *
214 * Cleanup the move fences from the memory manager object.
215 */
216 static inline void
ttm_resource_manager_cleanup(struct ttm_resource_manager * man)217 ttm_resource_manager_cleanup(struct ttm_resource_manager *man)
218 {
219 dma_fence_put(man->move);
220 man->move = NULL;
221 }
222
223 int ttm_resource_alloc(struct ttm_buffer_object *bo,
224 const struct ttm_place *place,
225 struct ttm_resource *res);
226 void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource *res);
227
228 void ttm_resource_manager_init(struct ttm_resource_manager *man,
229 unsigned long p_size);
230
231 int ttm_resource_manager_force_list_clean(struct ttm_bo_device *bdev,
232 struct ttm_resource_manager *man);
233
234 void ttm_resource_manager_debug(struct ttm_resource_manager *man,
235 struct drm_printer *p);
236
237 #endif
238
