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1 | /************************************************************************** |
2 | * | |
3 | * Copyright (c) 2006-2009 Vmware, Inc., Palo Alto, CA., USA | |
4 | * All Rights Reserved. | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a | |
7 | * copy of this software and associated documentation files (the | |
8 | * "Software"), to deal in the Software without restriction, including | |
9 | * without limitation the rights to use, copy, modify, merge, publish, | |
10 | * distribute, sub license, and/or sell copies of the Software, and to | |
11 | * permit persons to whom the Software is furnished to do so, subject to | |
12 | * the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice (including the | |
15 | * next paragraph) shall be included in all copies or substantial portions | |
16 | * of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | |
21 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, | |
22 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
23 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
24 | * USE OR OTHER DEALINGS IN THE SOFTWARE. | |
25 | * | |
26 | **************************************************************************/ | |
27 | /* | |
28 | * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> | |
29 | */ | |
30 | #ifndef _TTM_BO_DRIVER_H_ | |
31 | #define _TTM_BO_DRIVER_H_ | |
32 | ||
33 | #include "ttm/ttm_bo_api.h" | |
34 | #include "ttm/ttm_memory.h" | |
a987fcaa | 35 | #include "ttm/ttm_module.h" |
ba4e7d97 TH |
36 | #include "drm_mm.h" |
37 | #include "linux/workqueue.h" | |
38 | #include "linux/fs.h" | |
39 | #include "linux/spinlock.h" | |
40 | ||
41 | struct ttm_backend; | |
42 | ||
43 | struct ttm_backend_func { | |
44 | /** | |
45 | * struct ttm_backend_func member populate | |
46 | * | |
47 | * @backend: Pointer to a struct ttm_backend. | |
48 | * @num_pages: Number of pages to populate. | |
49 | * @pages: Array of pointers to ttm pages. | |
50 | * @dummy_read_page: Page to be used instead of NULL pages in the | |
51 | * array @pages. | |
52 | * | |
53 | * Populate the backend with ttm pages. Depending on the backend, | |
54 | * it may or may not copy the @pages array. | |
55 | */ | |
56 | int (*populate) (struct ttm_backend *backend, | |
57 | unsigned long num_pages, struct page **pages, | |
58 | struct page *dummy_read_page); | |
59 | /** | |
60 | * struct ttm_backend_func member clear | |
61 | * | |
62 | * @backend: Pointer to a struct ttm_backend. | |
63 | * | |
64 | * This is an "unpopulate" function. Release all resources | |
65 | * allocated with populate. | |
66 | */ | |
67 | void (*clear) (struct ttm_backend *backend); | |
68 | ||
69 | /** | |
70 | * struct ttm_backend_func member bind | |
71 | * | |
72 | * @backend: Pointer to a struct ttm_backend. | |
73 | * @bo_mem: Pointer to a struct ttm_mem_reg describing the | |
74 | * memory type and location for binding. | |
75 | * | |
76 | * Bind the backend pages into the aperture in the location | |
77 | * indicated by @bo_mem. This function should be able to handle | |
78 | * differences between aperture- and system page sizes. | |
79 | */ | |
80 | int (*bind) (struct ttm_backend *backend, struct ttm_mem_reg *bo_mem); | |
81 | ||
82 | /** | |
83 | * struct ttm_backend_func member unbind | |
84 | * | |
85 | * @backend: Pointer to a struct ttm_backend. | |
86 | * | |
87 | * Unbind previously bound backend pages. This function should be | |
88 | * able to handle differences between aperture- and system page sizes. | |
89 | */ | |
90 | int (*unbind) (struct ttm_backend *backend); | |
91 | ||
92 | /** | |
93 | * struct ttm_backend_func member destroy | |
94 | * | |
95 | * @backend: Pointer to a struct ttm_backend. | |
96 | * | |
97 | * Destroy the backend. | |
98 | */ | |
99 | void (*destroy) (struct ttm_backend *backend); | |
100 | }; | |
101 | ||
102 | /** | |
103 | * struct ttm_backend | |
104 | * | |
105 | * @bdev: Pointer to a struct ttm_bo_device. | |
106 | * @flags: For driver use. | |
107 | * @func: Pointer to a struct ttm_backend_func that describes | |
108 | * the backend methods. | |
109 | * | |
110 | */ | |
111 | ||
112 | struct ttm_backend { | |
113 | struct ttm_bo_device *bdev; | |
114 | uint32_t flags; | |
115 | struct ttm_backend_func *func; | |
116 | }; | |
117 | ||
ba4e7d97 TH |
118 | #define TTM_PAGE_FLAG_USER (1 << 1) |
119 | #define TTM_PAGE_FLAG_USER_DIRTY (1 << 2) | |
120 | #define TTM_PAGE_FLAG_WRITE (1 << 3) | |
121 | #define TTM_PAGE_FLAG_SWAPPED (1 << 4) | |
122 | #define TTM_PAGE_FLAG_PERSISTANT_SWAP (1 << 5) | |
123 | #define TTM_PAGE_FLAG_ZERO_ALLOC (1 << 6) | |
ad49f501 | 124 | #define TTM_PAGE_FLAG_DMA32 (1 << 7) |
ba4e7d97 TH |
125 | |
126 | enum ttm_caching_state { | |
127 | tt_uncached, | |
128 | tt_wc, | |
129 | tt_cached | |
130 | }; | |
131 | ||
132 | /** | |
133 | * struct ttm_tt | |
134 | * | |
135 | * @dummy_read_page: Page to map where the ttm_tt page array contains a NULL | |
136 | * pointer. | |
137 | * @pages: Array of pages backing the data. | |
138 | * @first_himem_page: Himem pages are put last in the page array, which | |
139 | * enables us to run caching attribute changes on only the first part | |
140 | * of the page array containing lomem pages. This is the index of the | |
141 | * first himem page. | |
142 | * @last_lomem_page: Index of the last lomem page in the page array. | |
143 | * @num_pages: Number of pages in the page array. | |
144 | * @bdev: Pointer to the current struct ttm_bo_device. | |
145 | * @be: Pointer to the ttm backend. | |
146 | * @tsk: The task for user ttm. | |
147 | * @start: virtual address for user ttm. | |
148 | * @swap_storage: Pointer to shmem struct file for swap storage. | |
149 | * @caching_state: The current caching state of the pages. | |
150 | * @state: The current binding state of the pages. | |
151 | * | |
152 | * This is a structure holding the pages, caching- and aperture binding | |
153 | * status for a buffer object that isn't backed by fixed (VRAM / AGP) | |
154 | * memory. | |
155 | */ | |
156 | ||
157 | struct ttm_tt { | |
158 | struct page *dummy_read_page; | |
159 | struct page **pages; | |
160 | long first_himem_page; | |
161 | long last_lomem_page; | |
162 | uint32_t page_flags; | |
163 | unsigned long num_pages; | |
a987fcaa | 164 | struct ttm_bo_global *glob; |
ba4e7d97 TH |
165 | struct ttm_backend *be; |
166 | struct task_struct *tsk; | |
167 | unsigned long start; | |
168 | struct file *swap_storage; | |
169 | enum ttm_caching_state caching_state; | |
170 | enum { | |
171 | tt_bound, | |
172 | tt_unbound, | |
173 | tt_unpopulated, | |
174 | } state; | |
175 | }; | |
176 | ||
177 | #define TTM_MEMTYPE_FLAG_FIXED (1 << 0) /* Fixed (on-card) PCI memory */ | |
178 | #define TTM_MEMTYPE_FLAG_MAPPABLE (1 << 1) /* Memory mappable */ | |
179 | #define TTM_MEMTYPE_FLAG_NEEDS_IOREMAP (1 << 2) /* Fixed memory needs ioremap | |
180 | before kernel access. */ | |
181 | #define TTM_MEMTYPE_FLAG_CMA (1 << 3) /* Can't map aperture */ | |
182 | ||
183 | /** | |
184 | * struct ttm_mem_type_manager | |
185 | * | |
186 | * @has_type: The memory type has been initialized. | |
187 | * @use_type: The memory type is enabled. | |
188 | * @flags: TTM_MEMTYPE_XX flags identifying the traits of the memory | |
189 | * managed by this memory type. | |
190 | * @gpu_offset: If used, the GPU offset of the first managed page of | |
191 | * fixed memory or the first managed location in an aperture. | |
192 | * @io_offset: The io_offset of the first managed page of IO memory or | |
193 | * the first managed location in an aperture. For TTM_MEMTYPE_FLAG_CMA | |
194 | * memory, this should be set to NULL. | |
195 | * @io_size: The size of a managed IO region (fixed memory or aperture). | |
196 | * @io_addr: Virtual kernel address if the io region is pre-mapped. For | |
197 | * TTM_MEMTYPE_FLAG_NEEDS_IOREMAP there is no pre-mapped io map and | |
198 | * @io_addr should be set to NULL. | |
199 | * @size: Size of the managed region. | |
200 | * @available_caching: A mask of available caching types, TTM_PL_FLAG_XX, | |
201 | * as defined in ttm_placement_common.h | |
202 | * @default_caching: The default caching policy used for a buffer object | |
203 | * placed in this memory type if the user doesn't provide one. | |
204 | * @manager: The range manager used for this memory type. FIXME: If the aperture | |
205 | * has a page size different from the underlying system, the granularity | |
206 | * of this manager should take care of this. But the range allocating code | |
207 | * in ttm_bo.c needs to be modified for this. | |
208 | * @lru: The lru list for this memory type. | |
209 | * | |
210 | * This structure is used to identify and manage memory types for a device. | |
211 | * It's set up by the ttm_bo_driver::init_mem_type method. | |
212 | */ | |
213 | ||
214 | struct ttm_mem_type_manager { | |
215 | ||
216 | /* | |
217 | * No protection. Constant from start. | |
218 | */ | |
219 | ||
220 | bool has_type; | |
221 | bool use_type; | |
222 | uint32_t flags; | |
223 | unsigned long gpu_offset; | |
224 | unsigned long io_offset; | |
225 | unsigned long io_size; | |
226 | void *io_addr; | |
227 | uint64_t size; | |
228 | uint32_t available_caching; | |
229 | uint32_t default_caching; | |
230 | ||
231 | /* | |
232 | * Protected by the bdev->lru_lock. | |
233 | * TODO: Consider one lru_lock per ttm_mem_type_manager. | |
234 | * Plays ill with list removal, though. | |
235 | */ | |
236 | ||
237 | struct drm_mm manager; | |
238 | struct list_head lru; | |
239 | }; | |
240 | ||
241 | /** | |
242 | * struct ttm_bo_driver | |
243 | * | |
ba4e7d97 TH |
244 | * @create_ttm_backend_entry: Callback to create a struct ttm_backend. |
245 | * @invalidate_caches: Callback to invalidate read caches when a buffer object | |
246 | * has been evicted. | |
247 | * @init_mem_type: Callback to initialize a struct ttm_mem_type_manager | |
248 | * structure. | |
249 | * @evict_flags: Callback to obtain placement flags when a buffer is evicted. | |
250 | * @move: Callback for a driver to hook in accelerated functions to | |
251 | * move a buffer. | |
252 | * If set to NULL, a potentially slow memcpy() move is used. | |
253 | * @sync_obj_signaled: See ttm_fence_api.h | |
254 | * @sync_obj_wait: See ttm_fence_api.h | |
255 | * @sync_obj_flush: See ttm_fence_api.h | |
256 | * @sync_obj_unref: See ttm_fence_api.h | |
257 | * @sync_obj_ref: See ttm_fence_api.h | |
258 | */ | |
259 | ||
260 | struct ttm_bo_driver { | |
ba4e7d97 TH |
261 | /** |
262 | * struct ttm_bo_driver member create_ttm_backend_entry | |
263 | * | |
264 | * @bdev: The buffer object device. | |
265 | * | |
266 | * Create a driver specific struct ttm_backend. | |
267 | */ | |
268 | ||
269 | struct ttm_backend *(*create_ttm_backend_entry) | |
270 | (struct ttm_bo_device *bdev); | |
271 | ||
272 | /** | |
273 | * struct ttm_bo_driver member invalidate_caches | |
274 | * | |
275 | * @bdev: the buffer object device. | |
276 | * @flags: new placement of the rebound buffer object. | |
277 | * | |
278 | * A previosly evicted buffer has been rebound in a | |
279 | * potentially new location. Tell the driver that it might | |
280 | * consider invalidating read (texture) caches on the next command | |
281 | * submission as a consequence. | |
282 | */ | |
283 | ||
284 | int (*invalidate_caches) (struct ttm_bo_device *bdev, uint32_t flags); | |
285 | int (*init_mem_type) (struct ttm_bo_device *bdev, uint32_t type, | |
286 | struct ttm_mem_type_manager *man); | |
287 | /** | |
288 | * struct ttm_bo_driver member evict_flags: | |
289 | * | |
290 | * @bo: the buffer object to be evicted | |
291 | * | |
292 | * Return the bo flags for a buffer which is not mapped to the hardware. | |
293 | * These will be placed in proposed_flags so that when the move is | |
294 | * finished, they'll end up in bo->mem.flags | |
295 | */ | |
296 | ||
ca262a99 JG |
297 | void(*evict_flags) (struct ttm_buffer_object *bo, |
298 | struct ttm_placement *placement); | |
ba4e7d97 TH |
299 | /** |
300 | * struct ttm_bo_driver member move: | |
301 | * | |
302 | * @bo: the buffer to move | |
303 | * @evict: whether this motion is evicting the buffer from | |
304 | * the graphics address space | |
305 | * @interruptible: Use interruptible sleeps if possible when sleeping. | |
306 | * @no_wait: whether this should give up and return -EBUSY | |
307 | * if this move would require sleeping | |
308 | * @new_mem: the new memory region receiving the buffer | |
309 | * | |
310 | * Move a buffer between two memory regions. | |
311 | */ | |
312 | int (*move) (struct ttm_buffer_object *bo, | |
313 | bool evict, bool interruptible, | |
314 | bool no_wait, struct ttm_mem_reg *new_mem); | |
315 | ||
316 | /** | |
317 | * struct ttm_bo_driver_member verify_access | |
318 | * | |
319 | * @bo: Pointer to a buffer object. | |
320 | * @filp: Pointer to a struct file trying to access the object. | |
321 | * | |
322 | * Called from the map / write / read methods to verify that the | |
323 | * caller is permitted to access the buffer object. | |
324 | * This member may be set to NULL, which will refuse this kind of | |
325 | * access for all buffer objects. | |
326 | * This function should return 0 if access is granted, -EPERM otherwise. | |
327 | */ | |
328 | int (*verify_access) (struct ttm_buffer_object *bo, | |
329 | struct file *filp); | |
330 | ||
331 | /** | |
332 | * In case a driver writer dislikes the TTM fence objects, | |
333 | * the driver writer can replace those with sync objects of | |
334 | * his / her own. If it turns out that no driver writer is | |
335 | * using these. I suggest we remove these hooks and plug in | |
336 | * fences directly. The bo driver needs the following functionality: | |
337 | * See the corresponding functions in the fence object API | |
338 | * documentation. | |
339 | */ | |
340 | ||
341 | bool (*sync_obj_signaled) (void *sync_obj, void *sync_arg); | |
342 | int (*sync_obj_wait) (void *sync_obj, void *sync_arg, | |
343 | bool lazy, bool interruptible); | |
344 | int (*sync_obj_flush) (void *sync_obj, void *sync_arg); | |
345 | void (*sync_obj_unref) (void **sync_obj); | |
346 | void *(*sync_obj_ref) (void *sync_obj); | |
e024e110 DA |
347 | |
348 | /* hook to notify driver about a driver move so it | |
349 | * can do tiling things */ | |
350 | void (*move_notify)(struct ttm_buffer_object *bo, | |
351 | struct ttm_mem_reg *new_mem); | |
352 | /* notify the driver we are taking a fault on this BO | |
353 | * and have reserved it */ | |
354 | void (*fault_reserve_notify)(struct ttm_buffer_object *bo); | |
3f09ea4e TH |
355 | |
356 | /** | |
357 | * notify the driver that we're about to swap out this bo | |
358 | */ | |
359 | void (*swap_notify) (struct ttm_buffer_object *bo); | |
ba4e7d97 TH |
360 | }; |
361 | ||
a987fcaa TH |
362 | /** |
363 | * struct ttm_bo_global_ref - Argument to initialize a struct ttm_bo_global. | |
364 | */ | |
365 | ||
366 | struct ttm_bo_global_ref { | |
367 | struct ttm_global_reference ref; | |
368 | struct ttm_mem_global *mem_glob; | |
369 | }; | |
ba4e7d97 | 370 | |
ba4e7d97 | 371 | /** |
a987fcaa | 372 | * struct ttm_bo_global - Buffer object driver global data. |
ba4e7d97 TH |
373 | * |
374 | * @mem_glob: Pointer to a struct ttm_mem_global object for accounting. | |
ba4e7d97 TH |
375 | * @dummy_read_page: Pointer to a dummy page used for mapping requests |
376 | * of unpopulated pages. | |
a987fcaa | 377 | * @shrink: A shrink callback object used for buffer object swap. |
ba4e7d97 TH |
378 | * @ttm_bo_extra_size: Extra size (sizeof(struct ttm_buffer_object) excluded) |
379 | * used by a buffer object. This is excluding page arrays and backing pages. | |
380 | * @ttm_bo_size: This is @ttm_bo_extra_size + sizeof(struct ttm_buffer_object). | |
a987fcaa TH |
381 | * @device_list_mutex: Mutex protecting the device list. |
382 | * This mutex is held while traversing the device list for pm options. | |
383 | * @lru_lock: Spinlock protecting the bo subsystem lru lists. | |
384 | * @device_list: List of buffer object devices. | |
385 | * @swap_lru: Lru list of buffer objects used for swapping. | |
386 | */ | |
387 | ||
388 | struct ttm_bo_global { | |
389 | ||
390 | /** | |
391 | * Constant after init. | |
392 | */ | |
393 | ||
394 | struct kobject kobj; | |
395 | struct ttm_mem_global *mem_glob; | |
396 | struct page *dummy_read_page; | |
397 | struct ttm_mem_shrink shrink; | |
398 | size_t ttm_bo_extra_size; | |
399 | size_t ttm_bo_size; | |
400 | struct mutex device_list_mutex; | |
401 | spinlock_t lru_lock; | |
402 | ||
403 | /** | |
404 | * Protected by device_list_mutex. | |
405 | */ | |
406 | struct list_head device_list; | |
407 | ||
408 | /** | |
409 | * Protected by the lru_lock. | |
410 | */ | |
411 | struct list_head swap_lru; | |
412 | ||
413 | /** | |
414 | * Internal protection. | |
415 | */ | |
416 | atomic_t bo_count; | |
417 | }; | |
418 | ||
419 | ||
420 | #define TTM_NUM_MEM_TYPES 8 | |
421 | ||
422 | #define TTM_BO_PRIV_FLAG_MOVING 0 /* Buffer object is moving and needs | |
423 | idling before CPU mapping */ | |
424 | #define TTM_BO_PRIV_FLAG_MAX 1 | |
425 | /** | |
426 | * struct ttm_bo_device - Buffer object driver device-specific data. | |
427 | * | |
428 | * @driver: Pointer to a struct ttm_bo_driver struct setup by the driver. | |
ba4e7d97 TH |
429 | * @man: An array of mem_type_managers. |
430 | * @addr_space_mm: Range manager for the device address space. | |
431 | * lru_lock: Spinlock that protects the buffer+device lru lists and | |
432 | * ddestroy lists. | |
433 | * @nice_mode: Try nicely to wait for buffer idle when cleaning a manager. | |
434 | * If a GPU lockup has been detected, this is forced to 0. | |
435 | * @dev_mapping: A pointer to the struct address_space representing the | |
436 | * device address space. | |
437 | * @wq: Work queue structure for the delayed delete workqueue. | |
438 | * | |
439 | */ | |
440 | ||
441 | struct ttm_bo_device { | |
442 | ||
443 | /* | |
444 | * Constant after bo device init / atomic. | |
445 | */ | |
a987fcaa TH |
446 | struct list_head device_list; |
447 | struct ttm_bo_global *glob; | |
ba4e7d97 | 448 | struct ttm_bo_driver *driver; |
ba4e7d97 | 449 | rwlock_t vm_lock; |
a987fcaa | 450 | struct ttm_mem_type_manager man[TTM_NUM_MEM_TYPES]; |
ba4e7d97 TH |
451 | /* |
452 | * Protected by the vm lock. | |
453 | */ | |
ba4e7d97 TH |
454 | struct rb_root addr_space_rb; |
455 | struct drm_mm addr_space_mm; | |
456 | ||
457 | /* | |
a987fcaa | 458 | * Protected by the global:lru lock. |
ba4e7d97 TH |
459 | */ |
460 | struct list_head ddestroy; | |
ba4e7d97 TH |
461 | |
462 | /* | |
463 | * Protected by load / firstopen / lastclose /unload sync. | |
464 | */ | |
465 | ||
466 | bool nice_mode; | |
467 | struct address_space *dev_mapping; | |
468 | ||
469 | /* | |
470 | * Internal protection. | |
471 | */ | |
472 | ||
473 | struct delayed_work wq; | |
ad49f501 DA |
474 | |
475 | bool need_dma32; | |
ba4e7d97 TH |
476 | }; |
477 | ||
478 | /** | |
479 | * ttm_flag_masked | |
480 | * | |
481 | * @old: Pointer to the result and original value. | |
482 | * @new: New value of bits. | |
483 | * @mask: Mask of bits to change. | |
484 | * | |
485 | * Convenience function to change a number of bits identified by a mask. | |
486 | */ | |
487 | ||
488 | static inline uint32_t | |
489 | ttm_flag_masked(uint32_t *old, uint32_t new, uint32_t mask) | |
490 | { | |
491 | *old ^= (*old ^ new) & mask; | |
492 | return *old; | |
493 | } | |
494 | ||
495 | /** | |
496 | * ttm_tt_create | |
497 | * | |
498 | * @bdev: pointer to a struct ttm_bo_device: | |
499 | * @size: Size of the data needed backing. | |
500 | * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags. | |
501 | * @dummy_read_page: See struct ttm_bo_device. | |
502 | * | |
503 | * Create a struct ttm_tt to back data with system memory pages. | |
504 | * No pages are actually allocated. | |
505 | * Returns: | |
506 | * NULL: Out of memory. | |
507 | */ | |
508 | extern struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, | |
509 | unsigned long size, | |
510 | uint32_t page_flags, | |
511 | struct page *dummy_read_page); | |
512 | ||
513 | /** | |
514 | * ttm_tt_set_user: | |
515 | * | |
516 | * @ttm: The struct ttm_tt to populate. | |
517 | * @tsk: A struct task_struct for which @start is a valid user-space address. | |
518 | * @start: A valid user-space address. | |
519 | * @num_pages: Size in pages of the user memory area. | |
520 | * | |
521 | * Populate a struct ttm_tt with a user-space memory area after first pinning | |
522 | * the pages backing it. | |
523 | * Returns: | |
524 | * !0: Error. | |
525 | */ | |
526 | ||
527 | extern int ttm_tt_set_user(struct ttm_tt *ttm, | |
528 | struct task_struct *tsk, | |
529 | unsigned long start, unsigned long num_pages); | |
530 | ||
531 | /** | |
532 | * ttm_ttm_bind: | |
533 | * | |
534 | * @ttm: The struct ttm_tt containing backing pages. | |
535 | * @bo_mem: The struct ttm_mem_reg identifying the binding location. | |
536 | * | |
537 | * Bind the pages of @ttm to an aperture location identified by @bo_mem | |
538 | */ | |
539 | extern int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem); | |
540 | ||
4bfd75cb TH |
541 | /** |
542 | * ttm_tt_populate: | |
543 | * | |
544 | * @ttm: The struct ttm_tt to contain the backing pages. | |
545 | * | |
546 | * Add backing pages to all of @ttm | |
547 | */ | |
548 | extern int ttm_tt_populate(struct ttm_tt *ttm); | |
549 | ||
ba4e7d97 TH |
550 | /** |
551 | * ttm_ttm_destroy: | |
552 | * | |
553 | * @ttm: The struct ttm_tt. | |
554 | * | |
555 | * Unbind, unpopulate and destroy a struct ttm_tt. | |
556 | */ | |
557 | extern void ttm_tt_destroy(struct ttm_tt *ttm); | |
558 | ||
559 | /** | |
560 | * ttm_ttm_unbind: | |
561 | * | |
562 | * @ttm: The struct ttm_tt. | |
563 | * | |
564 | * Unbind a struct ttm_tt. | |
565 | */ | |
566 | extern void ttm_tt_unbind(struct ttm_tt *ttm); | |
567 | ||
568 | /** | |
569 | * ttm_ttm_destroy: | |
570 | * | |
571 | * @ttm: The struct ttm_tt. | |
572 | * @index: Index of the desired page. | |
573 | * | |
574 | * Return a pointer to the struct page backing @ttm at page | |
575 | * index @index. If the page is unpopulated, one will be allocated to | |
576 | * populate that index. | |
577 | * | |
578 | * Returns: | |
579 | * NULL on OOM. | |
580 | */ | |
581 | extern struct page *ttm_tt_get_page(struct ttm_tt *ttm, int index); | |
582 | ||
583 | /** | |
584 | * ttm_tt_cache_flush: | |
585 | * | |
586 | * @pages: An array of pointers to struct page:s to flush. | |
587 | * @num_pages: Number of pages to flush. | |
588 | * | |
589 | * Flush the data of the indicated pages from the cpu caches. | |
590 | * This is used when changing caching attributes of the pages from | |
591 | * cache-coherent. | |
592 | */ | |
593 | extern void ttm_tt_cache_flush(struct page *pages[], unsigned long num_pages); | |
594 | ||
595 | /** | |
596 | * ttm_tt_set_placement_caching: | |
597 | * | |
598 | * @ttm A struct ttm_tt the backing pages of which will change caching policy. | |
599 | * @placement: Flag indicating the desired caching policy. | |
600 | * | |
601 | * This function will change caching policy of any default kernel mappings of | |
602 | * the pages backing @ttm. If changing from cached to uncached or | |
603 | * write-combined, | |
604 | * all CPU caches will first be flushed to make sure the data of the pages | |
605 | * hit RAM. This function may be very costly as it involves global TLB | |
606 | * and cache flushes and potential page splitting / combining. | |
607 | */ | |
608 | extern int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement); | |
609 | extern int ttm_tt_swapout(struct ttm_tt *ttm, | |
610 | struct file *persistant_swap_storage); | |
611 | ||
612 | /* | |
613 | * ttm_bo.c | |
614 | */ | |
615 | ||
616 | /** | |
617 | * ttm_mem_reg_is_pci | |
618 | * | |
619 | * @bdev: Pointer to a struct ttm_bo_device. | |
620 | * @mem: A valid struct ttm_mem_reg. | |
621 | * | |
622 | * Returns true if the memory described by @mem is PCI memory, | |
623 | * false otherwise. | |
624 | */ | |
625 | extern bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, | |
626 | struct ttm_mem_reg *mem); | |
627 | ||
628 | /** | |
629 | * ttm_bo_mem_space | |
630 | * | |
631 | * @bo: Pointer to a struct ttm_buffer_object. the data of which | |
632 | * we want to allocate space for. | |
633 | * @proposed_placement: Proposed new placement for the buffer object. | |
634 | * @mem: A struct ttm_mem_reg. | |
635 | * @interruptible: Sleep interruptible when sliping. | |
636 | * @no_wait: Don't sleep waiting for space to become available. | |
637 | * | |
638 | * Allocate memory space for the buffer object pointed to by @bo, using | |
639 | * the placement flags in @mem, potentially evicting other idle buffer objects. | |
640 | * This function may sleep while waiting for space to become available. | |
641 | * Returns: | |
642 | * -EBUSY: No space available (only if no_wait == 1). | |
643 | * -ENOMEM: Could not allocate memory for the buffer object, either due to | |
644 | * fragmentation or concurrent allocators. | |
98ffc415 | 645 | * -ERESTARTSYS: An interruptible sleep was interrupted by a signal. |
ba4e7d97 TH |
646 | */ |
647 | extern int ttm_bo_mem_space(struct ttm_buffer_object *bo, | |
ca262a99 JG |
648 | struct ttm_placement *placement, |
649 | struct ttm_mem_reg *mem, | |
650 | bool interruptible, bool no_wait); | |
ba4e7d97 TH |
651 | /** |
652 | * ttm_bo_wait_for_cpu | |
653 | * | |
654 | * @bo: Pointer to a struct ttm_buffer_object. | |
655 | * @no_wait: Don't sleep while waiting. | |
656 | * | |
657 | * Wait until a buffer object is no longer sync'ed for CPU access. | |
658 | * Returns: | |
659 | * -EBUSY: Buffer object was sync'ed for CPU access. (only if no_wait == 1). | |
98ffc415 | 660 | * -ERESTARTSYS: An interruptible sleep was interrupted by a signal. |
ba4e7d97 TH |
661 | */ |
662 | ||
663 | extern int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait); | |
664 | ||
665 | /** | |
666 | * ttm_bo_pci_offset - Get the PCI offset for the buffer object memory. | |
667 | * | |
668 | * @bo Pointer to a struct ttm_buffer_object. | |
669 | * @bus_base On return the base of the PCI region | |
670 | * @bus_offset On return the byte offset into the PCI region | |
671 | * @bus_size On return the byte size of the buffer object or zero if | |
672 | * the buffer object memory is not accessible through a PCI region. | |
673 | * | |
674 | * Returns: | |
675 | * -EINVAL if the buffer object is currently not mappable. | |
676 | * 0 otherwise. | |
677 | */ | |
678 | ||
679 | extern int ttm_bo_pci_offset(struct ttm_bo_device *bdev, | |
680 | struct ttm_mem_reg *mem, | |
681 | unsigned long *bus_base, | |
682 | unsigned long *bus_offset, | |
683 | unsigned long *bus_size); | |
684 | ||
a987fcaa TH |
685 | extern void ttm_bo_global_release(struct ttm_global_reference *ref); |
686 | extern int ttm_bo_global_init(struct ttm_global_reference *ref); | |
687 | ||
ba4e7d97 TH |
688 | extern int ttm_bo_device_release(struct ttm_bo_device *bdev); |
689 | ||
690 | /** | |
691 | * ttm_bo_device_init | |
692 | * | |
693 | * @bdev: A pointer to a struct ttm_bo_device to initialize. | |
694 | * @mem_global: A pointer to an initialized struct ttm_mem_global. | |
695 | * @driver: A pointer to a struct ttm_bo_driver set up by the caller. | |
696 | * @file_page_offset: Offset into the device address space that is available | |
697 | * for buffer data. This ensures compatibility with other users of the | |
698 | * address space. | |
699 | * | |
700 | * Initializes a struct ttm_bo_device: | |
701 | * Returns: | |
702 | * !0: Failure. | |
703 | */ | |
704 | extern int ttm_bo_device_init(struct ttm_bo_device *bdev, | |
a987fcaa | 705 | struct ttm_bo_global *glob, |
ba4e7d97 | 706 | struct ttm_bo_driver *driver, |
ad49f501 | 707 | uint64_t file_page_offset, bool need_dma32); |
ba4e7d97 | 708 | |
e024e110 DA |
709 | /** |
710 | * ttm_bo_unmap_virtual | |
711 | * | |
712 | * @bo: tear down the virtual mappings for this BO | |
713 | */ | |
714 | extern void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo); | |
ba4e7d97 TH |
715 | |
716 | /** | |
717 | * ttm_bo_reserve: | |
718 | * | |
719 | * @bo: A pointer to a struct ttm_buffer_object. | |
720 | * @interruptible: Sleep interruptible if waiting. | |
721 | * @no_wait: Don't sleep while trying to reserve, rather return -EBUSY. | |
722 | * @use_sequence: If @bo is already reserved, Only sleep waiting for | |
723 | * it to become unreserved if @sequence < (@bo)->sequence. | |
724 | * | |
725 | * Locks a buffer object for validation. (Or prevents other processes from | |
726 | * locking it for validation) and removes it from lru lists, while taking | |
727 | * a number of measures to prevent deadlocks. | |
728 | * | |
729 | * Deadlocks may occur when two processes try to reserve multiple buffers in | |
730 | * different order, either by will or as a result of a buffer being evicted | |
731 | * to make room for a buffer already reserved. (Buffers are reserved before | |
732 | * they are evicted). The following algorithm prevents such deadlocks from | |
733 | * occuring: | |
734 | * 1) Buffers are reserved with the lru spinlock held. Upon successful | |
735 | * reservation they are removed from the lru list. This stops a reserved buffer | |
736 | * from being evicted. However the lru spinlock is released between the time | |
737 | * a buffer is selected for eviction and the time it is reserved. | |
738 | * Therefore a check is made when a buffer is reserved for eviction, that it | |
739 | * is still the first buffer in the lru list, before it is removed from the | |
740 | * list. @check_lru == 1 forces this check. If it fails, the function returns | |
741 | * -EINVAL, and the caller should then choose a new buffer to evict and repeat | |
742 | * the procedure. | |
743 | * 2) Processes attempting to reserve multiple buffers other than for eviction, | |
744 | * (typically execbuf), should first obtain a unique 32-bit | |
745 | * validation sequence number, | |
746 | * and call this function with @use_sequence == 1 and @sequence == the unique | |
747 | * sequence number. If upon call of this function, the buffer object is already | |
748 | * reserved, the validation sequence is checked against the validation | |
749 | * sequence of the process currently reserving the buffer, | |
750 | * and if the current validation sequence is greater than that of the process | |
751 | * holding the reservation, the function returns -EAGAIN. Otherwise it sleeps | |
752 | * waiting for the buffer to become unreserved, after which it retries | |
753 | * reserving. | |
754 | * The caller should, when receiving an -EAGAIN error | |
755 | * release all its buffer reservations, wait for @bo to become unreserved, and | |
756 | * then rerun the validation with the same validation sequence. This procedure | |
757 | * will always guarantee that the process with the lowest validation sequence | |
758 | * will eventually succeed, preventing both deadlocks and starvation. | |
759 | * | |
760 | * Returns: | |
761 | * -EAGAIN: The reservation may cause a deadlock. | |
762 | * Release all buffer reservations, wait for @bo to become unreserved and | |
763 | * try again. (only if use_sequence == 1). | |
98ffc415 | 764 | * -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by |
ba4e7d97 TH |
765 | * a signal. Release all buffer reservations and return to user-space. |
766 | */ | |
767 | extern int ttm_bo_reserve(struct ttm_buffer_object *bo, | |
768 | bool interruptible, | |
769 | bool no_wait, bool use_sequence, uint32_t sequence); | |
770 | ||
771 | /** | |
772 | * ttm_bo_unreserve | |
773 | * | |
774 | * @bo: A pointer to a struct ttm_buffer_object. | |
775 | * | |
776 | * Unreserve a previous reservation of @bo. | |
777 | */ | |
778 | extern void ttm_bo_unreserve(struct ttm_buffer_object *bo); | |
779 | ||
780 | /** | |
781 | * ttm_bo_wait_unreserved | |
782 | * | |
783 | * @bo: A pointer to a struct ttm_buffer_object. | |
784 | * | |
785 | * Wait for a struct ttm_buffer_object to become unreserved. | |
786 | * This is typically used in the execbuf code to relax cpu-usage when | |
787 | * a potential deadlock condition backoff. | |
788 | */ | |
789 | extern int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, | |
790 | bool interruptible); | |
791 | ||
792 | /** | |
793 | * ttm_bo_block_reservation | |
794 | * | |
795 | * @bo: A pointer to a struct ttm_buffer_object. | |
796 | * @interruptible: Use interruptible sleep when waiting. | |
797 | * @no_wait: Don't sleep, but rather return -EBUSY. | |
798 | * | |
799 | * Block reservation for validation by simply reserving the buffer. | |
800 | * This is intended for single buffer use only without eviction, | |
801 | * and thus needs no deadlock protection. | |
802 | * | |
803 | * Returns: | |
804 | * -EBUSY: If no_wait == 1 and the buffer is already reserved. | |
98ffc415 | 805 | * -ERESTARTSYS: If interruptible == 1 and the process received a signal |
ba4e7d97 TH |
806 | * while sleeping. |
807 | */ | |
808 | extern int ttm_bo_block_reservation(struct ttm_buffer_object *bo, | |
809 | bool interruptible, bool no_wait); | |
810 | ||
811 | /** | |
812 | * ttm_bo_unblock_reservation | |
813 | * | |
814 | * @bo: A pointer to a struct ttm_buffer_object. | |
815 | * | |
816 | * Unblocks reservation leaving lru lists untouched. | |
817 | */ | |
818 | extern void ttm_bo_unblock_reservation(struct ttm_buffer_object *bo); | |
819 | ||
820 | /* | |
821 | * ttm_bo_util.c | |
822 | */ | |
823 | ||
824 | /** | |
825 | * ttm_bo_move_ttm | |
826 | * | |
827 | * @bo: A pointer to a struct ttm_buffer_object. | |
828 | * @evict: 1: This is an eviction. Don't try to pipeline. | |
829 | * @no_wait: Never sleep, but rather return with -EBUSY. | |
830 | * @new_mem: struct ttm_mem_reg indicating where to move. | |
831 | * | |
832 | * Optimized move function for a buffer object with both old and | |
833 | * new placement backed by a TTM. The function will, if successful, | |
834 | * free any old aperture space, and set (@new_mem)->mm_node to NULL, | |
835 | * and update the (@bo)->mem placement flags. If unsuccessful, the old | |
836 | * data remains untouched, and it's up to the caller to free the | |
837 | * memory space indicated by @new_mem. | |
838 | * Returns: | |
839 | * !0: Failure. | |
840 | */ | |
841 | ||
842 | extern int ttm_bo_move_ttm(struct ttm_buffer_object *bo, | |
843 | bool evict, bool no_wait, | |
844 | struct ttm_mem_reg *new_mem); | |
845 | ||
846 | /** | |
847 | * ttm_bo_move_memcpy | |
848 | * | |
849 | * @bo: A pointer to a struct ttm_buffer_object. | |
850 | * @evict: 1: This is an eviction. Don't try to pipeline. | |
851 | * @no_wait: Never sleep, but rather return with -EBUSY. | |
852 | * @new_mem: struct ttm_mem_reg indicating where to move. | |
853 | * | |
854 | * Fallback move function for a mappable buffer object in mappable memory. | |
855 | * The function will, if successful, | |
856 | * free any old aperture space, and set (@new_mem)->mm_node to NULL, | |
857 | * and update the (@bo)->mem placement flags. If unsuccessful, the old | |
858 | * data remains untouched, and it's up to the caller to free the | |
859 | * memory space indicated by @new_mem. | |
860 | * Returns: | |
861 | * !0: Failure. | |
862 | */ | |
863 | ||
864 | extern int ttm_bo_move_memcpy(struct ttm_buffer_object *bo, | |
865 | bool evict, | |
866 | bool no_wait, struct ttm_mem_reg *new_mem); | |
867 | ||
868 | /** | |
869 | * ttm_bo_free_old_node | |
870 | * | |
871 | * @bo: A pointer to a struct ttm_buffer_object. | |
872 | * | |
873 | * Utility function to free an old placement after a successful move. | |
874 | */ | |
875 | extern void ttm_bo_free_old_node(struct ttm_buffer_object *bo); | |
876 | ||
877 | /** | |
878 | * ttm_bo_move_accel_cleanup. | |
879 | * | |
880 | * @bo: A pointer to a struct ttm_buffer_object. | |
881 | * @sync_obj: A sync object that signals when moving is complete. | |
882 | * @sync_obj_arg: An argument to pass to the sync object idle / wait | |
883 | * functions. | |
884 | * @evict: This is an evict move. Don't return until the buffer is idle. | |
885 | * @no_wait: Never sleep, but rather return with -EBUSY. | |
886 | * @new_mem: struct ttm_mem_reg indicating where to move. | |
887 | * | |
888 | * Accelerated move function to be called when an accelerated move | |
889 | * has been scheduled. The function will create a new temporary buffer object | |
890 | * representing the old placement, and put the sync object on both buffer | |
891 | * objects. After that the newly created buffer object is unref'd to be | |
892 | * destroyed when the move is complete. This will help pipeline | |
893 | * buffer moves. | |
894 | */ | |
895 | ||
896 | extern int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo, | |
897 | void *sync_obj, | |
898 | void *sync_obj_arg, | |
899 | bool evict, bool no_wait, | |
900 | struct ttm_mem_reg *new_mem); | |
901 | /** | |
902 | * ttm_io_prot | |
903 | * | |
904 | * @c_state: Caching state. | |
905 | * @tmp: Page protection flag for a normal, cached mapping. | |
906 | * | |
907 | * Utility function that returns the pgprot_t that should be used for | |
908 | * setting up a PTE with the caching model indicated by @c_state. | |
909 | */ | |
a55e8d45 | 910 | extern pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp); |
ba4e7d97 TH |
911 | |
912 | #if (defined(CONFIG_AGP) || (defined(CONFIG_AGP_MODULE) && defined(MODULE))) | |
913 | #define TTM_HAS_AGP | |
914 | #include <linux/agp_backend.h> | |
915 | ||
916 | /** | |
917 | * ttm_agp_backend_init | |
918 | * | |
919 | * @bdev: Pointer to a struct ttm_bo_device. | |
920 | * @bridge: The agp bridge this device is sitting on. | |
921 | * | |
922 | * Create a TTM backend that uses the indicated AGP bridge as an aperture | |
923 | * for TT memory. This function uses the linux agpgart interface to | |
924 | * bind and unbind memory backing a ttm_tt. | |
925 | */ | |
926 | extern struct ttm_backend *ttm_agp_backend_init(struct ttm_bo_device *bdev, | |
927 | struct agp_bridge_data *bridge); | |
928 | #endif | |
929 | ||
930 | #endif |