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 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 */ 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 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