Commit | Line | Data |
---|---|---|
786d7257 ML |
1 | /* |
2 | * Header file for reservations for dma-buf and ttm | |
3 | * | |
4 | * Copyright(C) 2011 Linaro Limited. All rights reserved. | |
5 | * Copyright (C) 2012-2013 Canonical Ltd | |
6 | * Copyright (C) 2012 Texas Instruments | |
7 | * | |
8 | * Authors: | |
0ba6b8fb | 9 | * Rob Clark <robdclark@gmail.com> |
786d7257 ML |
10 | * Maarten Lankhorst <maarten.lankhorst@canonical.com> |
11 | * Thomas Hellstrom <thellstrom-at-vmware-dot-com> | |
12 | * | |
13 | * Based on bo.c which bears the following copyright notice, | |
14 | * but is dual licensed: | |
15 | * | |
16 | * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA | |
17 | * All Rights Reserved. | |
18 | * | |
19 | * Permission is hereby granted, free of charge, to any person obtaining a | |
20 | * copy of this software and associated documentation files (the | |
21 | * "Software"), to deal in the Software without restriction, including | |
22 | * without limitation the rights to use, copy, modify, merge, publish, | |
23 | * distribute, sub license, and/or sell copies of the Software, and to | |
24 | * permit persons to whom the Software is furnished to do so, subject to | |
25 | * the following conditions: | |
26 | * | |
27 | * The above copyright notice and this permission notice (including the | |
28 | * next paragraph) shall be included in all copies or substantial portions | |
29 | * of the Software. | |
30 | * | |
31 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
32 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
33 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | |
34 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, | |
35 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
36 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
37 | * USE OR OTHER DEALINGS IN THE SOFTWARE. | |
38 | */ | |
39 | #ifndef _LINUX_RESERVATION_H | |
40 | #define _LINUX_RESERVATION_H | |
41 | ||
1b375dc3 | 42 | #include <linux/ww_mutex.h> |
f54d1867 | 43 | #include <linux/dma-fence.h> |
0ba6b8fb | 44 | #include <linux/slab.h> |
3c3b177a ML |
45 | #include <linux/seqlock.h> |
46 | #include <linux/rcupdate.h> | |
786d7257 ML |
47 | |
48 | extern struct ww_class reservation_ww_class; | |
49 | ||
8938d484 | 50 | struct dma_resv_list; |
04a5faa8 | 51 | |
7bc80a54 CK |
52 | /** |
53 | * enum dma_resv_usage - how the fences from a dma_resv obj are used | |
54 | * | |
55 | * This enum describes the different use cases for a dma_resv object and | |
56 | * controls which fences are returned when queried. | |
57 | * | |
0cc848a7 | 58 | * An important fact is that there is the order KERNEL<WRITE<READ<BOOKKEEP and |
b29895e1 CK |
59 | * when the dma_resv object is asked for fences for one use case the fences |
60 | * for the lower use case are returned as well. | |
61 | * | |
62 | * For example when asking for WRITE fences then the KERNEL fences are returned | |
63 | * as well. Similar when asked for READ fences then both WRITE and KERNEL | |
64 | * fences are returned as well. | |
7bc80a54 CK |
65 | */ |
66 | enum dma_resv_usage { | |
b29895e1 CK |
67 | /** |
68 | * @DMA_RESV_USAGE_KERNEL: For in kernel memory management only. | |
69 | * | |
70 | * This should only be used for things like copying or clearing memory | |
71 | * with a DMA hardware engine for the purpose of kernel memory | |
72 | * management. | |
73 | * | |
74 | * Drivers *always* must wait for those fences before accessing the | |
75 | * resource protected by the dma_resv object. The only exception for | |
76 | * that is when the resource is known to be locked down in place by | |
77 | * pinning it previously. | |
78 | */ | |
79 | DMA_RESV_USAGE_KERNEL, | |
80 | ||
7bc80a54 CK |
81 | /** |
82 | * @DMA_RESV_USAGE_WRITE: Implicit write synchronization. | |
83 | * | |
84 | * This should only be used for userspace command submissions which add | |
85 | * an implicit write dependency. | |
86 | */ | |
87 | DMA_RESV_USAGE_WRITE, | |
88 | ||
89 | /** | |
90 | * @DMA_RESV_USAGE_READ: Implicit read synchronization. | |
91 | * | |
92 | * This should only be used for userspace command submissions which add | |
93 | * an implicit read dependency. | |
94 | */ | |
95 | DMA_RESV_USAGE_READ, | |
0cc848a7 CK |
96 | |
97 | /** | |
98 | * @DMA_RESV_USAGE_BOOKKEEP: No implicit sync. | |
99 | * | |
100 | * This should be used by submissions which don't want to participate in | |
101 | * implicit synchronization. | |
102 | * | |
103 | * The most common case are preemption fences as well as page table | |
104 | * updates and their TLB flushes. | |
105 | */ | |
106 | DMA_RESV_USAGE_BOOKKEEP | |
7bc80a54 CK |
107 | }; |
108 | ||
109 | /** | |
110 | * dma_resv_usage_rw - helper for implicit sync | |
111 | * @write: true if we create a new implicit sync write | |
112 | * | |
113 | * This returns the implicit synchronization usage for write or read accesses, | |
114 | * see enum dma_resv_usage and &dma_buf.resv. | |
115 | */ | |
116 | static inline enum dma_resv_usage dma_resv_usage_rw(bool write) | |
117 | { | |
118 | /* This looks confusing at first sight, but is indeed correct. | |
119 | * | |
120 | * The rational is that new write operations needs to wait for the | |
121 | * existing read and write operations to finish. | |
122 | * But a new read operation only needs to wait for the existing write | |
123 | * operations to finish. | |
124 | */ | |
125 | return write ? DMA_RESV_USAGE_READ : DMA_RESV_USAGE_WRITE; | |
126 | } | |
127 | ||
dad6c394 | 128 | /** |
52791eee | 129 | * struct dma_resv - a reservation object manages fences for a buffer |
d9edf92d | 130 | * |
047a1b87 CK |
131 | * This is a container for dma_fence objects which needs to handle multiple use |
132 | * cases. | |
d9edf92d DV |
133 | * |
134 | * One use is to synchronize cross-driver access to a struct dma_buf, either for | |
135 | * dynamic buffer management or just to handle implicit synchronization between | |
136 | * different users of the buffer in userspace. See &dma_buf.resv for a more | |
137 | * in-depth discussion. | |
138 | * | |
139 | * The other major use is to manage access and locking within a driver in a | |
140 | * buffer based memory manager. struct ttm_buffer_object is the canonical | |
141 | * example here, since this is where reservation objects originated from. But | |
142 | * use in drivers is spreading and some drivers also manage struct | |
143 | * drm_gem_object with the same scheme. | |
dad6c394 | 144 | */ |
52791eee | 145 | struct dma_resv { |
d9edf92d DV |
146 | /** |
147 | * @lock: | |
148 | * | |
149 | * Update side lock. Don't use directly, instead use the wrapper | |
150 | * functions like dma_resv_lock() and dma_resv_unlock(). | |
151 | * | |
152 | * Drivers which use the reservation object to manage memory dynamically | |
153 | * also use this lock to protect buffer object state like placement, | |
154 | * allocation policies or throughout command submission. | |
155 | */ | |
786d7257 | 156 | struct ww_mutex lock; |
d9edf92d | 157 | |
d9edf92d | 158 | /** |
047a1b87 | 159 | * @fences: |
d9edf92d | 160 | * |
047a1b87 | 161 | * Array of fences which where added to the dma_resv object |
d9edf92d | 162 | * |
047a1b87 CK |
163 | * A new fence is added by calling dma_resv_add_fence(). Since this |
164 | * often needs to be done past the point of no return in command | |
d9edf92d | 165 | * submission it cannot fail, and therefore sufficient slots need to be |
c8d4c18b | 166 | * reserved by calling dma_resv_reserve_fences(). |
d9edf92d | 167 | */ |
047a1b87 | 168 | struct dma_resv_list __rcu *fences; |
786d7257 ML |
169 | }; |
170 | ||
c921ff37 CK |
171 | /** |
172 | * struct dma_resv_iter - current position into the dma_resv fences | |
173 | * | |
174 | * Don't touch this directly in the driver, use the accessor function instead. | |
d80976d9 DV |
175 | * |
176 | * IMPORTANT | |
177 | * | |
178 | * When using the lockless iterators like dma_resv_iter_next_unlocked() or | |
179 | * dma_resv_for_each_fence_unlocked() beware that the iterator can be restarted. | |
180 | * Code which accumulates statistics or similar needs to check for this with | |
181 | * dma_resv_iter_is_restarted(). | |
c921ff37 CK |
182 | */ |
183 | struct dma_resv_iter { | |
184 | /** @obj: The dma_resv object we iterate over */ | |
185 | struct dma_resv *obj; | |
186 | ||
7bc80a54 CK |
187 | /** @usage: Return fences with this usage or lower. */ |
188 | enum dma_resv_usage usage; | |
c921ff37 CK |
189 | |
190 | /** @fence: the currently handled fence */ | |
191 | struct dma_fence *fence; | |
192 | ||
73511edf CK |
193 | /** @fence_usage: the usage of the current fence */ |
194 | enum dma_resv_usage fence_usage; | |
195 | ||
c921ff37 CK |
196 | /** @index: index into the shared fences */ |
197 | unsigned int index; | |
198 | ||
5e51cc00 | 199 | /** @fences: the shared fences; private, *MUST* not dereference */ |
c921ff37 CK |
200 | struct dma_resv_list *fences; |
201 | ||
047a1b87 CK |
202 | /** @num_fences: number of fences */ |
203 | unsigned int num_fences; | |
5e51cc00 | 204 | |
c921ff37 CK |
205 | /** @is_restarted: true if this is the first returned fence */ |
206 | bool is_restarted; | |
207 | }; | |
208 | ||
209 | struct dma_fence *dma_resv_iter_first_unlocked(struct dma_resv_iter *cursor); | |
210 | struct dma_fence *dma_resv_iter_next_unlocked(struct dma_resv_iter *cursor); | |
5baaac31 CK |
211 | struct dma_fence *dma_resv_iter_first(struct dma_resv_iter *cursor); |
212 | struct dma_fence *dma_resv_iter_next(struct dma_resv_iter *cursor); | |
c921ff37 CK |
213 | |
214 | /** | |
215 | * dma_resv_iter_begin - initialize a dma_resv_iter object | |
216 | * @cursor: The dma_resv_iter object to initialize | |
217 | * @obj: The dma_resv object which we want to iterate over | |
7bc80a54 | 218 | * @usage: controls which fences to include, see enum dma_resv_usage. |
c921ff37 CK |
219 | */ |
220 | static inline void dma_resv_iter_begin(struct dma_resv_iter *cursor, | |
221 | struct dma_resv *obj, | |
7bc80a54 | 222 | enum dma_resv_usage usage) |
c921ff37 CK |
223 | { |
224 | cursor->obj = obj; | |
7bc80a54 | 225 | cursor->usage = usage; |
c921ff37 CK |
226 | cursor->fence = NULL; |
227 | } | |
228 | ||
229 | /** | |
230 | * dma_resv_iter_end - cleanup a dma_resv_iter object | |
231 | * @cursor: the dma_resv_iter object which should be cleaned up | |
232 | * | |
233 | * Make sure that the reference to the fence in the cursor is properly | |
234 | * dropped. | |
235 | */ | |
236 | static inline void dma_resv_iter_end(struct dma_resv_iter *cursor) | |
237 | { | |
238 | dma_fence_put(cursor->fence); | |
239 | } | |
240 | ||
241 | /** | |
73511edf | 242 | * dma_resv_iter_usage - Return the usage of the current fence |
c921ff37 CK |
243 | * @cursor: the cursor of the current position |
244 | * | |
73511edf | 245 | * Returns the usage of the currently processed fence. |
c921ff37 | 246 | */ |
73511edf CK |
247 | static inline enum dma_resv_usage |
248 | dma_resv_iter_usage(struct dma_resv_iter *cursor) | |
c921ff37 | 249 | { |
73511edf | 250 | return cursor->fence_usage; |
c921ff37 CK |
251 | } |
252 | ||
253 | /** | |
254 | * dma_resv_iter_is_restarted - test if this is the first fence after a restart | |
255 | * @cursor: the cursor with the current position | |
256 | * | |
257 | * Return true if this is the first fence in an iteration after a restart. | |
258 | */ | |
259 | static inline bool dma_resv_iter_is_restarted(struct dma_resv_iter *cursor) | |
260 | { | |
261 | return cursor->is_restarted; | |
262 | } | |
263 | ||
264 | /** | |
265 | * dma_resv_for_each_fence_unlocked - unlocked fence iterator | |
266 | * @cursor: a struct dma_resv_iter pointer | |
267 | * @fence: the current fence | |
268 | * | |
269 | * Iterate over the fences in a struct dma_resv object without holding the | |
270 | * &dma_resv.lock and using RCU instead. The cursor needs to be initialized | |
271 | * with dma_resv_iter_begin() and cleaned up with dma_resv_iter_end(). Inside | |
272 | * the iterator a reference to the dma_fence is held and the RCU lock dropped. | |
d80976d9 DV |
273 | * |
274 | * Beware that the iterator can be restarted when the struct dma_resv for | |
275 | * @cursor is modified. Code which accumulates statistics or similar needs to | |
276 | * check for this with dma_resv_iter_is_restarted(). For this reason prefer the | |
277 | * lock iterator dma_resv_for_each_fence() whenever possible. | |
c921ff37 CK |
278 | */ |
279 | #define dma_resv_for_each_fence_unlocked(cursor, fence) \ | |
280 | for (fence = dma_resv_iter_first_unlocked(cursor); \ | |
281 | fence; fence = dma_resv_iter_next_unlocked(cursor)) | |
282 | ||
5baaac31 CK |
283 | /** |
284 | * dma_resv_for_each_fence - fence iterator | |
285 | * @cursor: a struct dma_resv_iter pointer | |
286 | * @obj: a dma_resv object pointer | |
7bc80a54 | 287 | * @usage: controls which fences to return |
5baaac31 CK |
288 | * @fence: the current fence |
289 | * | |
290 | * Iterate over the fences in a struct dma_resv object while holding the | |
291 | * &dma_resv.lock. @all_fences controls if the shared fences are returned as | |
292 | * well. The cursor initialisation is part of the iterator and the fence stays | |
293 | * valid as long as the lock is held and so no extra reference to the fence is | |
294 | * taken. | |
295 | */ | |
7bc80a54 CK |
296 | #define dma_resv_for_each_fence(cursor, obj, usage, fence) \ |
297 | for (dma_resv_iter_begin(cursor, obj, usage), \ | |
5baaac31 CK |
298 | fence = dma_resv_iter_first(cursor); fence; \ |
299 | fence = dma_resv_iter_next(cursor)) | |
300 | ||
52791eee CK |
301 | #define dma_resv_held(obj) lockdep_is_held(&(obj)->lock.base) |
302 | #define dma_resv_assert_held(obj) lockdep_assert_held(&(obj)->lock.base) | |
04a5faa8 | 303 | |
0c6b522a | 304 | #ifdef CONFIG_DEBUG_MUTEXES |
73511edf | 305 | void dma_resv_reset_max_fences(struct dma_resv *obj); |
0c6b522a | 306 | #else |
73511edf | 307 | static inline void dma_resv_reset_max_fences(struct dma_resv *obj) {} |
0c6b522a CK |
308 | #endif |
309 | ||
122020af | 310 | /** |
52791eee | 311 | * dma_resv_lock - lock the reservation object |
122020af CW |
312 | * @obj: the reservation object |
313 | * @ctx: the locking context | |
314 | * | |
315 | * Locks the reservation object for exclusive access and modification. Note, | |
316 | * that the lock is only against other writers, readers will run concurrently | |
317 | * with a writer under RCU. The seqlock is used to notify readers if they | |
318 | * overlap with a writer. | |
319 | * | |
320 | * As the reservation object may be locked by multiple parties in an | |
321 | * undefined order, a #ww_acquire_ctx is passed to unwind if a cycle | |
322 | * is detected. See ww_mutex_lock() and ww_acquire_init(). A reservation | |
323 | * object may be locked by itself by passing NULL as @ctx. | |
d9edf92d DV |
324 | * |
325 | * When a die situation is indicated by returning -EDEADLK all locks held by | |
326 | * @ctx must be unlocked and then dma_resv_lock_slow() called on @obj. | |
327 | * | |
328 | * Unlocked by calling dma_resv_unlock(). | |
329 | * | |
330 | * See also dma_resv_lock_interruptible() for the interruptible variant. | |
122020af | 331 | */ |
52791eee CK |
332 | static inline int dma_resv_lock(struct dma_resv *obj, |
333 | struct ww_acquire_ctx *ctx) | |
122020af CW |
334 | { |
335 | return ww_mutex_lock(&obj->lock, ctx); | |
336 | } | |
337 | ||
5d276a1a | 338 | /** |
52791eee | 339 | * dma_resv_lock_interruptible - lock the reservation object |
5d276a1a CK |
340 | * @obj: the reservation object |
341 | * @ctx: the locking context | |
342 | * | |
343 | * Locks the reservation object interruptible for exclusive access and | |
344 | * modification. Note, that the lock is only against other writers, readers | |
345 | * will run concurrently with a writer under RCU. The seqlock is used to | |
346 | * notify readers if they overlap with a writer. | |
347 | * | |
348 | * As the reservation object may be locked by multiple parties in an | |
349 | * undefined order, a #ww_acquire_ctx is passed to unwind if a cycle | |
350 | * is detected. See ww_mutex_lock() and ww_acquire_init(). A reservation | |
351 | * object may be locked by itself by passing NULL as @ctx. | |
d9edf92d DV |
352 | * |
353 | * When a die situation is indicated by returning -EDEADLK all locks held by | |
354 | * @ctx must be unlocked and then dma_resv_lock_slow_interruptible() called on | |
355 | * @obj. | |
356 | * | |
357 | * Unlocked by calling dma_resv_unlock(). | |
5d276a1a | 358 | */ |
52791eee CK |
359 | static inline int dma_resv_lock_interruptible(struct dma_resv *obj, |
360 | struct ww_acquire_ctx *ctx) | |
5d276a1a CK |
361 | { |
362 | return ww_mutex_lock_interruptible(&obj->lock, ctx); | |
363 | } | |
364 | ||
0dbd555a | 365 | /** |
52791eee | 366 | * dma_resv_lock_slow - slowpath lock the reservation object |
0dbd555a CK |
367 | * @obj: the reservation object |
368 | * @ctx: the locking context | |
369 | * | |
370 | * Acquires the reservation object after a die case. This function | |
52791eee | 371 | * will sleep until the lock becomes available. See dma_resv_lock() as |
0dbd555a | 372 | * well. |
d9edf92d DV |
373 | * |
374 | * See also dma_resv_lock_slow_interruptible() for the interruptible variant. | |
0dbd555a | 375 | */ |
52791eee CK |
376 | static inline void dma_resv_lock_slow(struct dma_resv *obj, |
377 | struct ww_acquire_ctx *ctx) | |
0dbd555a CK |
378 | { |
379 | ww_mutex_lock_slow(&obj->lock, ctx); | |
380 | } | |
381 | ||
382 | /** | |
52791eee | 383 | * dma_resv_lock_slow_interruptible - slowpath lock the reservation |
0dbd555a CK |
384 | * object, interruptible |
385 | * @obj: the reservation object | |
386 | * @ctx: the locking context | |
387 | * | |
388 | * Acquires the reservation object interruptible after a die case. This function | |
389 | * will sleep until the lock becomes available. See | |
52791eee | 390 | * dma_resv_lock_interruptible() as well. |
0dbd555a | 391 | */ |
52791eee CK |
392 | static inline int dma_resv_lock_slow_interruptible(struct dma_resv *obj, |
393 | struct ww_acquire_ctx *ctx) | |
0dbd555a CK |
394 | { |
395 | return ww_mutex_lock_slow_interruptible(&obj->lock, ctx); | |
396 | } | |
5d276a1a | 397 | |
2955b73d | 398 | /** |
52791eee | 399 | * dma_resv_trylock - trylock the reservation object |
2955b73d CW |
400 | * @obj: the reservation object |
401 | * | |
402 | * Tries to lock the reservation object for exclusive access and modification. | |
403 | * Note, that the lock is only against other writers, readers will run | |
404 | * concurrently with a writer under RCU. The seqlock is used to notify readers | |
405 | * if they overlap with a writer. | |
406 | * | |
407 | * Also note that since no context is provided, no deadlock protection is | |
d9edf92d | 408 | * possible, which is also not needed for a trylock. |
2955b73d CW |
409 | * |
410 | * Returns true if the lock was acquired, false otherwise. | |
411 | */ | |
52791eee | 412 | static inline bool __must_check dma_resv_trylock(struct dma_resv *obj) |
2955b73d | 413 | { |
12235da8 | 414 | return ww_mutex_trylock(&obj->lock, NULL); |
2955b73d CW |
415 | } |
416 | ||
0dbd555a | 417 | /** |
52791eee | 418 | * dma_resv_is_locked - is the reservation object locked |
0dbd555a CK |
419 | * @obj: the reservation object |
420 | * | |
421 | * Returns true if the mutex is locked, false if unlocked. | |
422 | */ | |
52791eee | 423 | static inline bool dma_resv_is_locked(struct dma_resv *obj) |
0dbd555a CK |
424 | { |
425 | return ww_mutex_is_locked(&obj->lock); | |
426 | } | |
427 | ||
428 | /** | |
52791eee | 429 | * dma_resv_locking_ctx - returns the context used to lock the object |
0dbd555a CK |
430 | * @obj: the reservation object |
431 | * | |
432 | * Returns the context used to lock a reservation object or NULL if no context | |
433 | * was used or the object is not locked at all. | |
d9edf92d DV |
434 | * |
435 | * WARNING: This interface is pretty horrible, but TTM needs it because it | |
436 | * doesn't pass the struct ww_acquire_ctx around in some very long callchains. | |
437 | * Everyone else just uses it to check whether they're holding a reservation or | |
438 | * not. | |
0dbd555a | 439 | */ |
52791eee | 440 | static inline struct ww_acquire_ctx *dma_resv_locking_ctx(struct dma_resv *obj) |
0dbd555a CK |
441 | { |
442 | return READ_ONCE(obj->lock.ctx); | |
443 | } | |
444 | ||
122020af | 445 | /** |
52791eee | 446 | * dma_resv_unlock - unlock the reservation object |
122020af CW |
447 | * @obj: the reservation object |
448 | * | |
449 | * Unlocks the reservation object following exclusive access. | |
450 | */ | |
52791eee | 451 | static inline void dma_resv_unlock(struct dma_resv *obj) |
122020af | 452 | { |
73511edf | 453 | dma_resv_reset_max_fences(obj); |
122020af CW |
454 | ww_mutex_unlock(&obj->lock); |
455 | } | |
456 | ||
52791eee CK |
457 | void dma_resv_init(struct dma_resv *obj); |
458 | void dma_resv_fini(struct dma_resv *obj); | |
c8d4c18b | 459 | int dma_resv_reserve_fences(struct dma_resv *obj, unsigned int num_fences); |
73511edf CK |
460 | void dma_resv_add_fence(struct dma_resv *obj, struct dma_fence *fence, |
461 | enum dma_resv_usage usage); | |
548e7432 | 462 | void dma_resv_replace_fences(struct dma_resv *obj, uint64_t context, |
73511edf CK |
463 | struct dma_fence *fence, |
464 | enum dma_resv_usage usage); | |
7bc80a54 | 465 | int dma_resv_get_fences(struct dma_resv *obj, enum dma_resv_usage usage, |
75ab2b36 | 466 | unsigned int *num_fences, struct dma_fence ***fences); |
7bc80a54 | 467 | int dma_resv_get_singleton(struct dma_resv *obj, enum dma_resv_usage usage, |
92cedee6 | 468 | struct dma_fence **fence); |
52791eee | 469 | int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src); |
7bc80a54 CK |
470 | long dma_resv_wait_timeout(struct dma_resv *obj, enum dma_resv_usage usage, |
471 | bool intr, unsigned long timeout); | |
472 | bool dma_resv_test_signaled(struct dma_resv *obj, enum dma_resv_usage usage); | |
a25efb38 | 473 | void dma_resv_describe(struct dma_resv *obj, struct seq_file *seq); |
3c3b177a | 474 | |
786d7257 | 475 | #endif /* _LINUX_RESERVATION_H */ |