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_DEVICE_H_
26 #define _TTM_DEVICE_H_
28 #include <linux/types.h>
29 #include <linux/workqueue.h>
30 #include <drm/ttm/ttm_resource.h>
31 #include <drm/ttm/ttm_pool.h>
33 #define TTM_NUM_MEM_TYPES 8
37 struct ttm_buffer_object;
38 struct ttm_operation_ctx;
41 * struct ttm_global - Buffer object driver global data.
43 * @dummy_read_page: Pointer to a dummy page used for mapping requests
44 * of unpopulated pages.
45 * @shrink: A shrink callback object used for buffer object swap.
46 * @device_list_mutex: Mutex protecting the device list.
47 * This mutex is held while traversing the device list for pm options.
48 * @lru_lock: Spinlock protecting the bo subsystem lru lists.
49 * @device_list: List of buffer object devices.
50 * @swap_lru: Lru list of buffer objects used for swapping.
52 extern struct ttm_global {
55 * Constant after init.
58 struct page *dummy_read_page;
62 * Protected by ttm_global_mutex.
64 struct list_head device_list;
67 * Protected by the lru_lock.
69 struct list_head swap_lru[TTM_MAX_BO_PRIORITY];
72 * Internal protection.
77 struct ttm_device_funcs {
81 * @bo: The buffer object to create the ttm for.
82 * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
84 * Create a struct ttm_tt to back data with system memory pages.
85 * No pages are actually allocated.
87 * NULL: Out of memory.
89 struct ttm_tt *(*ttm_tt_create)(struct ttm_buffer_object *bo,
95 * @ttm: The struct ttm_tt to contain the backing pages.
97 * Allocate all backing pages
99 * -ENOMEM: Out of memory.
101 int (*ttm_tt_populate)(struct ttm_device *bdev,
103 struct ttm_operation_ctx *ctx);
108 * @ttm: The struct ttm_tt to contain the backing pages.
110 * Free all backing page
112 void (*ttm_tt_unpopulate)(struct ttm_device *bdev,
118 * @bdev: Pointer to a ttm device
119 * @ttm: Pointer to a struct ttm_tt.
121 * Destroy the backend. This will be call back from ttm_tt_destroy so
122 * don't call ttm_tt_destroy from the callback or infinite loop.
124 void (*ttm_tt_destroy)(struct ttm_device *bdev, struct ttm_tt *ttm);
127 * struct ttm_bo_driver member eviction_valuable
129 * @bo: the buffer object to be evicted
130 * @place: placement we need room for
132 * Check with the driver if it is valuable to evict a BO to make room
133 * for a certain placement.
135 bool (*eviction_valuable)(struct ttm_buffer_object *bo,
136 const struct ttm_place *place);
138 * struct ttm_bo_driver member evict_flags:
140 * @bo: the buffer object to be evicted
142 * Return the bo flags for a buffer which is not mapped to the hardware.
143 * These will be placed in proposed_flags so that when the move is
144 * finished, they'll end up in bo->mem.flags
145 * This should not cause multihop evictions, and the core will warn
146 * if one is proposed.
149 void (*evict_flags)(struct ttm_buffer_object *bo,
150 struct ttm_placement *placement);
153 * struct ttm_bo_driver member move:
155 * @bo: the buffer to move
156 * @evict: whether this motion is evicting the buffer from
157 * the graphics address space
158 * @ctx: context for this move with parameters
159 * @new_mem: the new memory region receiving the buffer
160 @ @hop: placement for driver directed intermediate hop
162 * Move a buffer between two memory regions.
163 * Returns errno -EMULTIHOP if driver requests a hop
165 int (*move)(struct ttm_buffer_object *bo, bool evict,
166 struct ttm_operation_ctx *ctx,
167 struct ttm_resource *new_mem,
168 struct ttm_place *hop);
171 * struct ttm_bo_driver_member verify_access
173 * @bo: Pointer to a buffer object.
174 * @filp: Pointer to a struct file trying to access the object.
176 * Called from the map / write / read methods to verify that the
177 * caller is permitted to access the buffer object.
178 * This member may be set to NULL, which will refuse this kind of
179 * access for all buffer objects.
180 * This function should return 0 if access is granted, -EPERM otherwise.
182 int (*verify_access)(struct ttm_buffer_object *bo,
186 * Hook to notify driver about a resource delete.
188 void (*delete_mem_notify)(struct ttm_buffer_object *bo);
191 * notify the driver that we're about to swap out this bo
193 void (*swap_notify)(struct ttm_buffer_object *bo);
196 * Driver callback on when mapping io memory (for bo_move_memcpy
197 * for instance). TTM will take care to call io_mem_free whenever
198 * the mapping is not use anymore. io_mem_reserve & io_mem_free
201 int (*io_mem_reserve)(struct ttm_device *bdev,
202 struct ttm_resource *mem);
203 void (*io_mem_free)(struct ttm_device *bdev,
204 struct ttm_resource *mem);
207 * Return the pfn for a given page_offset inside the BO.
209 * @bo: the BO to look up the pfn for
210 * @page_offset: the offset to look up
212 unsigned long (*io_mem_pfn)(struct ttm_buffer_object *bo,
213 unsigned long page_offset);
216 * Read/write memory buffers for ptrace access
218 * @bo: the BO to access
219 * @offset: the offset from the start of the BO
220 * @buf: pointer to source/destination buffer
221 * @len: number of bytes to copy
222 * @write: whether to read (0) from or write (non-0) to BO
224 * If successful, this function should return the number of
225 * bytes copied, -EIO otherwise. If the number of bytes
226 * returned is < len, the function may be called again with
227 * the remainder of the buffer to copy.
229 int (*access_memory)(struct ttm_buffer_object *bo, unsigned long offset,
230 void *buf, int len, int write);
233 * struct ttm_bo_driver member del_from_lru_notify
235 * @bo: the buffer object deleted from lru
237 * notify driver that a BO was deleted from LRU.
239 void (*del_from_lru_notify)(struct ttm_buffer_object *bo);
242 * Notify the driver that we're about to release a BO
244 * @bo: BO that is about to be released
246 * Gives the driver a chance to do any cleanup, including
247 * adding fences that may force a delayed delete
249 void (*release_notify)(struct ttm_buffer_object *bo);
253 * struct ttm_device - Buffer object driver device-specific data.
255 * @device_list: Our entry in the global device list.
256 * @funcs: Function table for the device.
257 * @sysman: Resource manager for the system domain.
258 * @man_drv: An array of resource_managers.
259 * @vma_manager: Address space manager.
260 * @pool: page pool for the device.
261 * @dev_mapping: A pointer to the struct address_space representing the
262 * device address space.
263 * @wq: Work queue structure for the delayed delete workqueue.
267 * Constant after bo device init
269 struct list_head device_list;
270 struct ttm_device_funcs *funcs;
273 * Access via ttm_manager_type.
275 struct ttm_resource_manager sysman;
276 struct ttm_resource_manager *man_drv[TTM_NUM_MEM_TYPES];
279 * Protected by internal locks.
281 struct drm_vma_offset_manager *vma_manager;
282 struct ttm_pool pool;
285 * Protected by the global:lru lock.
287 struct list_head ddestroy;
290 * Protected by load / firstopen / lastclose /unload sync.
292 struct address_space *dev_mapping;
295 * Internal protection.
297 struct delayed_work wq;
300 int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags);
302 static inline struct ttm_resource_manager *
303 ttm_manager_type(struct ttm_device *bdev, int mem_type)
305 return bdev->man_drv[mem_type];
308 static inline void ttm_set_driver_manager(struct ttm_device *bdev, int type,
309 struct ttm_resource_manager *manager)
311 bdev->man_drv[type] = manager;
314 int ttm_device_init(struct ttm_device *bdev, struct ttm_device_funcs *funcs,
315 struct device *dev, struct address_space *mapping,
316 struct drm_vma_offset_manager *vma_manager,
317 bool use_dma_alloc, bool use_dma32);
318 void ttm_device_fini(struct ttm_device *bdev);