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