2 * Copyright 2020 Advanced Micro Devices, Inc.
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:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
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.
22 * Authors: Christian König
25 #ifndef _TTM_RESOURCE_H_
26 #define _TTM_RESOURCE_H_
28 #include <linux/types.h>
29 #include <linux/mutex.h>
30 #include <linux/dma-fence.h>
31 #include <drm/drm_print.h>
33 #define TTM_MAX_BO_PRIORITY 4U
36 struct ttm_resource_manager;
39 struct ttm_buffer_object;
41 struct ttm_resource_manager_func {
43 * struct ttm_resource_manager_func member alloc
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.
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.
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.
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.
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);
76 * struct ttm_resource_manager_func member free
78 * @man: Pointer to a memory type manager.
79 * @mem: Pointer to a struct ttm_resource to be filled in.
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.
85 void (*free)(struct ttm_resource_manager *man,
86 struct ttm_resource *mem);
89 * struct ttm_resource_manager_func member debug
91 * @man: Pointer to a memory type manager.
92 * @printer: Prefix to be used in printout to identify the caller.
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.
98 void (*debug)(struct ttm_resource_manager *man,
99 struct drm_printer *printer);
103 * struct ttm_resource_manager
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 * @available_caching: A mask of available caching types, TTM_PL_FLAG_XX,
112 * as defined in ttm_placement_common.h
113 * @default_caching: The default caching policy used for a buffer object
114 * placed in this memory type if the user doesn't provide one.
115 * @func: structure pointer implementing the range manager. See above
116 * @move_lock: lock for move fence
117 * static information. bdev::driver::io_mem_free is never used.
118 * @lru: The lru list for this memory type.
119 * @move: The fence of the last pipelined move operation.
121 * This structure is used to identify and manage memory types for a device.
123 struct ttm_resource_manager {
125 * No protection. Constant from start.
130 uint32_t available_caching;
131 uint32_t default_caching;
132 const struct ttm_resource_manager_func *func;
133 spinlock_t move_lock;
136 * Protected by the global->lru_lock.
139 struct list_head lru[TTM_MAX_BO_PRIORITY];
142 * Protected by @move_lock.
144 struct dma_fence *move;
148 * struct ttm_bus_placement
150 * @addr: mapped virtual address
151 * @offset: physical addr
152 * @is_iomem: is this io memory ?
154 * Structure indicating the bus placement of an object.
156 struct ttm_bus_placement {
163 * struct ttm_resource
165 * @mm_node: Memory manager node.
166 * @size: Requested size of memory region.
167 * @num_pages: Actual size of memory region in pages.
168 * @page_alignment: Page alignment.
169 * @placement: Placement flags.
170 * @bus: Placement on io bus accessible to the CPU
172 * Structure indicating the placement and space resources used by a
175 struct ttm_resource {
179 unsigned long num_pages;
180 uint32_t page_alignment;
183 struct ttm_bus_placement bus;
187 * ttm_resource_manager_set_used
189 * @man: A memory manager object.
190 * @used: usage state to set.
192 * Set the manager in use flag. If disabled the manager is no longer
193 * used for object placement.
196 ttm_resource_manager_set_used(struct ttm_resource_manager *man, bool used)
198 man->use_type = used;
202 * ttm_resource_manager_used
204 * @man: Manager to get used state for
206 * Get the in use flag for a manager.
208 * true is used, false if not.
210 static inline bool ttm_resource_manager_used(struct ttm_resource_manager *man)
212 return man->use_type;
216 * ttm_resource_manager_cleanup
218 * @man: A memory manager object.
220 * Cleanup the move fences from the memory manager object.
223 ttm_resource_manager_cleanup(struct ttm_resource_manager *man)
225 dma_fence_put(man->move);
229 int ttm_resource_alloc(struct ttm_buffer_object *bo,
230 const struct ttm_place *place,
231 struct ttm_resource *res);
232 void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource *res);
234 void ttm_resource_manager_init(struct ttm_resource_manager *man,
235 unsigned long p_size);
237 int ttm_resource_manager_force_list_clean(struct ttm_bo_device *bdev,
238 struct ttm_resource_manager *man);
240 void ttm_resource_manager_debug(struct ttm_resource_manager *man,
241 struct drm_printer *p);