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e9083420 DA |
1 | /* |
2 | * Copyright 2017 Red Hat | |
5e60a10e DA |
3 | * Parts ported from amdgpu (fence wait code). |
4 | * Copyright 2016 Advanced Micro Devices, Inc. | |
e9083420 DA |
5 | * |
6 | * Permission is hereby granted, free of charge, to any person obtaining a | |
7 | * copy of this software and associated documentation files (the "Software"), | |
8 | * to deal in the Software without restriction, including without limitation | |
9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
10 | * and/or sell copies of the Software, and to permit persons to whom the | |
11 | * Software is furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice (including the next | |
14 | * paragraph) shall be included in all copies or substantial portions of the | |
15 | * Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
22 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
23 | * IN THE SOFTWARE. | |
24 | * | |
25 | * Authors: | |
26 | * | |
27 | */ | |
28 | ||
29 | /** | |
30 | * DOC: Overview | |
31 | * | |
924fe8df DV |
32 | * DRM synchronisation objects (syncobj, see struct &drm_syncobj) are |
33 | * persistent objects that contain an optional fence. The fence can be updated | |
34 | * with a new fence, or be NULL. | |
e9083420 | 35 | * |
5e60a10e DA |
36 | * syncobj's can be waited upon, where it will wait for the underlying |
37 | * fence. | |
38 | * | |
e9083420 DA |
39 | * syncobj's can be export to fd's and back, these fd's are opaque and |
40 | * have no other use case, except passing the syncobj between processes. | |
41 | * | |
42 | * Their primary use-case is to implement Vulkan fences and semaphores. | |
43 | * | |
44 | * syncobj have a kref reference count, but also have an optional file. | |
45 | * The file is only created once the syncobj is exported. | |
46 | * The file takes a reference on the kref. | |
47 | */ | |
48 | ||
49 | #include <drm/drmP.h> | |
50 | #include <linux/file.h> | |
51 | #include <linux/fs.h> | |
52 | #include <linux/anon_inodes.h> | |
3ee45a3b | 53 | #include <linux/sync_file.h> |
e7aca503 | 54 | #include <linux/sched/signal.h> |
e9083420 DA |
55 | |
56 | #include "drm_internal.h" | |
57 | #include <drm/drm_syncobj.h> | |
58 | ||
59 | /** | |
60 | * drm_syncobj_find - lookup and reference a sync object. | |
61 | * @file_private: drm file private pointer | |
62 | * @handle: sync object handle to lookup. | |
63 | * | |
924fe8df DV |
64 | * Returns a reference to the syncobj pointed to by handle or NULL. The |
65 | * reference must be released by calling drm_syncobj_put(). | |
e9083420 DA |
66 | */ |
67 | struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private, | |
68 | u32 handle) | |
69 | { | |
70 | struct drm_syncobj *syncobj; | |
71 | ||
72 | spin_lock(&file_private->syncobj_table_lock); | |
73 | ||
74 | /* Check if we currently have a reference on the object */ | |
75 | syncobj = idr_find(&file_private->syncobj_idr, handle); | |
76 | if (syncobj) | |
77 | drm_syncobj_get(syncobj); | |
78 | ||
79 | spin_unlock(&file_private->syncobj_table_lock); | |
80 | ||
81 | return syncobj; | |
82 | } | |
83 | EXPORT_SYMBOL(drm_syncobj_find); | |
84 | ||
9c19fb10 JE |
85 | static void drm_syncobj_add_callback_locked(struct drm_syncobj *syncobj, |
86 | struct drm_syncobj_cb *cb, | |
87 | drm_syncobj_func_t func) | |
88 | { | |
89 | cb->func = func; | |
90 | list_add_tail(&cb->node, &syncobj->cb_list); | |
91 | } | |
92 | ||
e7aca503 JE |
93 | static int drm_syncobj_fence_get_or_add_callback(struct drm_syncobj *syncobj, |
94 | struct dma_fence **fence, | |
95 | struct drm_syncobj_cb *cb, | |
96 | drm_syncobj_func_t func) | |
97 | { | |
98 | int ret; | |
99 | ||
100 | *fence = drm_syncobj_fence_get(syncobj); | |
101 | if (*fence) | |
102 | return 1; | |
103 | ||
104 | spin_lock(&syncobj->lock); | |
105 | /* We've already tried once to get a fence and failed. Now that we | |
106 | * have the lock, try one more time just to be sure we don't add a | |
107 | * callback when a fence has already been set. | |
108 | */ | |
109 | if (syncobj->fence) { | |
563eaf53 VS |
110 | *fence = dma_fence_get(rcu_dereference_protected(syncobj->fence, |
111 | lockdep_is_held(&syncobj->lock))); | |
e7aca503 JE |
112 | ret = 1; |
113 | } else { | |
114 | *fence = NULL; | |
115 | drm_syncobj_add_callback_locked(syncobj, cb, func); | |
116 | ret = 0; | |
117 | } | |
118 | spin_unlock(&syncobj->lock); | |
119 | ||
120 | return ret; | |
121 | } | |
122 | ||
9c19fb10 JE |
123 | /** |
124 | * drm_syncobj_add_callback - adds a callback to syncobj::cb_list | |
125 | * @syncobj: Sync object to which to add the callback | |
126 | * @cb: Callback to add | |
127 | * @func: Func to use when initializing the drm_syncobj_cb struct | |
128 | * | |
129 | * This adds a callback to be called next time the fence is replaced | |
130 | */ | |
131 | void drm_syncobj_add_callback(struct drm_syncobj *syncobj, | |
132 | struct drm_syncobj_cb *cb, | |
133 | drm_syncobj_func_t func) | |
134 | { | |
135 | spin_lock(&syncobj->lock); | |
136 | drm_syncobj_add_callback_locked(syncobj, cb, func); | |
137 | spin_unlock(&syncobj->lock); | |
138 | } | |
139 | EXPORT_SYMBOL(drm_syncobj_add_callback); | |
140 | ||
141 | /** | |
142 | * drm_syncobj_add_callback - removes a callback to syncobj::cb_list | |
143 | * @syncobj: Sync object from which to remove the callback | |
144 | * @cb: Callback to remove | |
145 | */ | |
146 | void drm_syncobj_remove_callback(struct drm_syncobj *syncobj, | |
147 | struct drm_syncobj_cb *cb) | |
148 | { | |
149 | spin_lock(&syncobj->lock); | |
150 | list_del_init(&cb->node); | |
151 | spin_unlock(&syncobj->lock); | |
152 | } | |
153 | EXPORT_SYMBOL(drm_syncobj_remove_callback); | |
154 | ||
e9083420 DA |
155 | /** |
156 | * drm_syncobj_replace_fence - replace fence in a sync object. | |
e9083420 DA |
157 | * @syncobj: Sync object to replace fence in |
158 | * @fence: fence to install in sync file. | |
159 | * | |
160 | * This replaces the fence on a sync object. | |
161 | */ | |
00fc2c26 | 162 | void drm_syncobj_replace_fence(struct drm_syncobj *syncobj, |
e9083420 DA |
163 | struct dma_fence *fence) |
164 | { | |
00fc2c26 | 165 | struct dma_fence *old_fence; |
9c19fb10 | 166 | struct drm_syncobj_cb *cur, *tmp; |
e9083420 DA |
167 | |
168 | if (fence) | |
169 | dma_fence_get(fence); | |
9c19fb10 JE |
170 | |
171 | spin_lock(&syncobj->lock); | |
172 | ||
563eaf53 VS |
173 | old_fence = rcu_dereference_protected(syncobj->fence, |
174 | lockdep_is_held(&syncobj->lock)); | |
175 | rcu_assign_pointer(syncobj->fence, fence); | |
9c19fb10 JE |
176 | |
177 | if (fence != old_fence) { | |
178 | list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node) { | |
179 | list_del_init(&cur->node); | |
180 | cur->func(syncobj, cur); | |
181 | } | |
182 | } | |
183 | ||
184 | spin_unlock(&syncobj->lock); | |
e9083420 DA |
185 | |
186 | dma_fence_put(old_fence); | |
187 | } | |
188 | EXPORT_SYMBOL(drm_syncobj_replace_fence); | |
189 | ||
1fc08218 JE |
190 | struct drm_syncobj_null_fence { |
191 | struct dma_fence base; | |
192 | spinlock_t lock; | |
193 | }; | |
194 | ||
195 | static const char *drm_syncobj_null_fence_get_name(struct dma_fence *fence) | |
196 | { | |
197 | return "syncobjnull"; | |
198 | } | |
199 | ||
200 | static bool drm_syncobj_null_fence_enable_signaling(struct dma_fence *fence) | |
201 | { | |
202 | dma_fence_enable_sw_signaling(fence); | |
203 | return !dma_fence_is_signaled(fence); | |
204 | } | |
205 | ||
206 | static const struct dma_fence_ops drm_syncobj_null_fence_ops = { | |
207 | .get_driver_name = drm_syncobj_null_fence_get_name, | |
208 | .get_timeline_name = drm_syncobj_null_fence_get_name, | |
209 | .enable_signaling = drm_syncobj_null_fence_enable_signaling, | |
210 | .wait = dma_fence_default_wait, | |
211 | .release = NULL, | |
212 | }; | |
213 | ||
214 | static int drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj) | |
215 | { | |
216 | struct drm_syncobj_null_fence *fence; | |
217 | fence = kzalloc(sizeof(*fence), GFP_KERNEL); | |
218 | if (fence == NULL) | |
219 | return -ENOMEM; | |
220 | ||
221 | spin_lock_init(&fence->lock); | |
222 | dma_fence_init(&fence->base, &drm_syncobj_null_fence_ops, | |
223 | &fence->lock, 0, 0); | |
224 | dma_fence_signal(&fence->base); | |
225 | ||
226 | drm_syncobj_replace_fence(syncobj, &fence->base); | |
227 | ||
228 | dma_fence_put(&fence->base); | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
924fe8df DV |
233 | /** |
234 | * drm_syncobj_find_fence - lookup and reference the fence in a sync object | |
235 | * @file_private: drm file private pointer | |
236 | * @handle: sync object handle to lookup. | |
237 | * @fence: out parameter for the fence | |
238 | * | |
239 | * This is just a convenience function that combines drm_syncobj_find() and | |
240 | * drm_syncobj_fence_get(). | |
241 | * | |
242 | * Returns 0 on success or a negative error value on failure. On success @fence | |
243 | * contains a reference to the fence, which must be released by calling | |
244 | * dma_fence_put(). | |
245 | */ | |
afaf5923 JE |
246 | int drm_syncobj_find_fence(struct drm_file *file_private, |
247 | u32 handle, | |
248 | struct dma_fence **fence) | |
e9083420 DA |
249 | { |
250 | struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle); | |
251 | int ret = 0; | |
252 | ||
253 | if (!syncobj) | |
254 | return -ENOENT; | |
255 | ||
309a5482 | 256 | *fence = drm_syncobj_fence_get(syncobj); |
e9083420 DA |
257 | if (!*fence) { |
258 | ret = -EINVAL; | |
259 | } | |
260 | drm_syncobj_put(syncobj); | |
261 | return ret; | |
262 | } | |
afaf5923 | 263 | EXPORT_SYMBOL(drm_syncobj_find_fence); |
e9083420 DA |
264 | |
265 | /** | |
266 | * drm_syncobj_free - free a sync object. | |
267 | * @kref: kref to free. | |
268 | * | |
269 | * Only to be called from kref_put in drm_syncobj_put. | |
270 | */ | |
271 | void drm_syncobj_free(struct kref *kref) | |
272 | { | |
273 | struct drm_syncobj *syncobj = container_of(kref, | |
274 | struct drm_syncobj, | |
275 | refcount); | |
9c19fb10 | 276 | drm_syncobj_replace_fence(syncobj, NULL); |
e9083420 DA |
277 | kfree(syncobj); |
278 | } | |
279 | EXPORT_SYMBOL(drm_syncobj_free); | |
280 | ||
1321fd2c MO |
281 | /** |
282 | * drm_syncobj_create - create a new syncobj | |
283 | * @out_syncobj: returned syncobj | |
284 | * @flags: DRM_SYNCOBJ_* flags | |
285 | * @fence: if non-NULL, the syncobj will represent this fence | |
924fe8df DV |
286 | * |
287 | * This is the first function to create a sync object. After creating, drivers | |
288 | * probably want to make it available to userspace, either through | |
289 | * drm_syncobj_get_handle() or drm_syncobj_get_fd(). | |
290 | * | |
291 | * Returns 0 on success or a negative error value on failure. | |
1321fd2c MO |
292 | */ |
293 | int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags, | |
294 | struct dma_fence *fence) | |
e9083420 DA |
295 | { |
296 | int ret; | |
297 | struct drm_syncobj *syncobj; | |
298 | ||
299 | syncobj = kzalloc(sizeof(struct drm_syncobj), GFP_KERNEL); | |
300 | if (!syncobj) | |
301 | return -ENOMEM; | |
302 | ||
303 | kref_init(&syncobj->refcount); | |
9c19fb10 JE |
304 | INIT_LIST_HEAD(&syncobj->cb_list); |
305 | spin_lock_init(&syncobj->lock); | |
e9083420 | 306 | |
1fc08218 JE |
307 | if (flags & DRM_SYNCOBJ_CREATE_SIGNALED) { |
308 | ret = drm_syncobj_assign_null_handle(syncobj); | |
309 | if (ret < 0) { | |
310 | drm_syncobj_put(syncobj); | |
311 | return ret; | |
312 | } | |
313 | } | |
314 | ||
1321fd2c MO |
315 | if (fence) |
316 | drm_syncobj_replace_fence(syncobj, fence); | |
317 | ||
318 | *out_syncobj = syncobj; | |
319 | return 0; | |
320 | } | |
321 | EXPORT_SYMBOL(drm_syncobj_create); | |
322 | ||
323 | /** | |
324 | * drm_syncobj_get_handle - get a handle from a syncobj | |
924fe8df DV |
325 | * @file_private: drm file private pointer |
326 | * @syncobj: Sync object to export | |
327 | * @handle: out parameter with the new handle | |
328 | * | |
329 | * Exports a sync object created with drm_syncobj_create() as a handle on | |
330 | * @file_private to userspace. | |
331 | * | |
332 | * Returns 0 on success or a negative error value on failure. | |
1321fd2c MO |
333 | */ |
334 | int drm_syncobj_get_handle(struct drm_file *file_private, | |
335 | struct drm_syncobj *syncobj, u32 *handle) | |
336 | { | |
337 | int ret; | |
338 | ||
339 | /* take a reference to put in the idr */ | |
340 | drm_syncobj_get(syncobj); | |
341 | ||
e9083420 DA |
342 | idr_preload(GFP_KERNEL); |
343 | spin_lock(&file_private->syncobj_table_lock); | |
344 | ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT); | |
345 | spin_unlock(&file_private->syncobj_table_lock); | |
346 | ||
347 | idr_preload_end(); | |
348 | ||
349 | if (ret < 0) { | |
350 | drm_syncobj_put(syncobj); | |
351 | return ret; | |
352 | } | |
353 | ||
354 | *handle = ret; | |
355 | return 0; | |
356 | } | |
1321fd2c MO |
357 | EXPORT_SYMBOL(drm_syncobj_get_handle); |
358 | ||
359 | static int drm_syncobj_create_as_handle(struct drm_file *file_private, | |
360 | u32 *handle, uint32_t flags) | |
361 | { | |
362 | int ret; | |
363 | struct drm_syncobj *syncobj; | |
364 | ||
365 | ret = drm_syncobj_create(&syncobj, flags, NULL); | |
366 | if (ret) | |
367 | return ret; | |
368 | ||
369 | ret = drm_syncobj_get_handle(file_private, syncobj, handle); | |
370 | drm_syncobj_put(syncobj); | |
371 | return ret; | |
372 | } | |
e9083420 DA |
373 | |
374 | static int drm_syncobj_destroy(struct drm_file *file_private, | |
375 | u32 handle) | |
376 | { | |
377 | struct drm_syncobj *syncobj; | |
378 | ||
379 | spin_lock(&file_private->syncobj_table_lock); | |
380 | syncobj = idr_remove(&file_private->syncobj_idr, handle); | |
381 | spin_unlock(&file_private->syncobj_table_lock); | |
382 | ||
383 | if (!syncobj) | |
384 | return -EINVAL; | |
385 | ||
386 | drm_syncobj_put(syncobj); | |
387 | return 0; | |
388 | } | |
389 | ||
390 | static int drm_syncobj_file_release(struct inode *inode, struct file *file) | |
391 | { | |
392 | struct drm_syncobj *syncobj = file->private_data; | |
393 | ||
394 | drm_syncobj_put(syncobj); | |
395 | return 0; | |
396 | } | |
397 | ||
398 | static const struct file_operations drm_syncobj_file_fops = { | |
399 | .release = drm_syncobj_file_release, | |
400 | }; | |
401 | ||
924fe8df DV |
402 | /** |
403 | * drm_syncobj_get_fd - get a file descriptor from a syncobj | |
404 | * @syncobj: Sync object to export | |
405 | * @p_fd: out parameter with the new file descriptor | |
406 | * | |
407 | * Exports a sync object created with drm_syncobj_create() as a file descriptor. | |
408 | * | |
409 | * Returns 0 on success or a negative error value on failure. | |
410 | */ | |
684fd0af | 411 | int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd) |
e9083420 | 412 | { |
e7cdf5c8 | 413 | struct file *file; |
e9083420 DA |
414 | int fd; |
415 | ||
e9083420 | 416 | fd = get_unused_fd_flags(O_CLOEXEC); |
684fd0af | 417 | if (fd < 0) |
e9083420 | 418 | return fd; |
e9083420 | 419 | |
e7cdf5c8 CW |
420 | file = anon_inode_getfile("syncobj_file", |
421 | &drm_syncobj_file_fops, | |
422 | syncobj, 0); | |
423 | if (IS_ERR(file)) { | |
424 | put_unused_fd(fd); | |
425 | return PTR_ERR(file); | |
e9083420 | 426 | } |
e7cdf5c8 CW |
427 | |
428 | drm_syncobj_get(syncobj); | |
429 | fd_install(fd, file); | |
430 | ||
e9083420 DA |
431 | *p_fd = fd; |
432 | return 0; | |
684fd0af MO |
433 | } |
434 | EXPORT_SYMBOL(drm_syncobj_get_fd); | |
435 | ||
436 | static int drm_syncobj_handle_to_fd(struct drm_file *file_private, | |
437 | u32 handle, int *p_fd) | |
438 | { | |
439 | struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle); | |
440 | int ret; | |
441 | ||
442 | if (!syncobj) | |
443 | return -EINVAL; | |
444 | ||
445 | ret = drm_syncobj_get_fd(syncobj, p_fd); | |
e9083420 DA |
446 | drm_syncobj_put(syncobj); |
447 | return ret; | |
448 | } | |
449 | ||
e9083420 DA |
450 | static int drm_syncobj_fd_to_handle(struct drm_file *file_private, |
451 | int fd, u32 *handle) | |
452 | { | |
e7cdf5c8 CW |
453 | struct drm_syncobj *syncobj; |
454 | struct file *file; | |
e9083420 DA |
455 | int ret; |
456 | ||
e7cdf5c8 CW |
457 | file = fget(fd); |
458 | if (!file) | |
e9083420 DA |
459 | return -EINVAL; |
460 | ||
e7cdf5c8 CW |
461 | if (file->f_op != &drm_syncobj_file_fops) { |
462 | fput(file); | |
463 | return -EINVAL; | |
464 | } | |
465 | ||
e9083420 | 466 | /* take a reference to put in the idr */ |
e7cdf5c8 | 467 | syncobj = file->private_data; |
e9083420 DA |
468 | drm_syncobj_get(syncobj); |
469 | ||
470 | idr_preload(GFP_KERNEL); | |
471 | spin_lock(&file_private->syncobj_table_lock); | |
472 | ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT); | |
473 | spin_unlock(&file_private->syncobj_table_lock); | |
474 | idr_preload_end(); | |
475 | ||
e7cdf5c8 CW |
476 | if (ret > 0) { |
477 | *handle = ret; | |
478 | ret = 0; | |
479 | } else | |
480 | drm_syncobj_put(syncobj); | |
481 | ||
482 | fput(file); | |
483 | return ret; | |
e9083420 DA |
484 | } |
485 | ||
a32c94af VS |
486 | static int drm_syncobj_import_sync_file_fence(struct drm_file *file_private, |
487 | int fd, int handle) | |
3ee45a3b DA |
488 | { |
489 | struct dma_fence *fence = sync_file_get_fence(fd); | |
490 | struct drm_syncobj *syncobj; | |
491 | ||
492 | if (!fence) | |
493 | return -EINVAL; | |
494 | ||
495 | syncobj = drm_syncobj_find(file_private, handle); | |
496 | if (!syncobj) { | |
497 | dma_fence_put(fence); | |
498 | return -ENOENT; | |
499 | } | |
500 | ||
00fc2c26 | 501 | drm_syncobj_replace_fence(syncobj, fence); |
3ee45a3b DA |
502 | dma_fence_put(fence); |
503 | drm_syncobj_put(syncobj); | |
504 | return 0; | |
505 | } | |
506 | ||
a32c94af VS |
507 | static int drm_syncobj_export_sync_file(struct drm_file *file_private, |
508 | int handle, int *p_fd) | |
3ee45a3b DA |
509 | { |
510 | int ret; | |
511 | struct dma_fence *fence; | |
512 | struct sync_file *sync_file; | |
513 | int fd = get_unused_fd_flags(O_CLOEXEC); | |
514 | ||
515 | if (fd < 0) | |
516 | return fd; | |
517 | ||
afaf5923 | 518 | ret = drm_syncobj_find_fence(file_private, handle, &fence); |
3ee45a3b DA |
519 | if (ret) |
520 | goto err_put_fd; | |
521 | ||
522 | sync_file = sync_file_create(fence); | |
523 | ||
524 | dma_fence_put(fence); | |
525 | ||
526 | if (!sync_file) { | |
527 | ret = -EINVAL; | |
528 | goto err_put_fd; | |
529 | } | |
530 | ||
531 | fd_install(fd, sync_file->file); | |
532 | ||
533 | *p_fd = fd; | |
534 | return 0; | |
535 | err_put_fd: | |
536 | put_unused_fd(fd); | |
537 | return ret; | |
538 | } | |
e9083420 DA |
539 | /** |
540 | * drm_syncobj_open - initalizes syncobj file-private structures at devnode open time | |
e9083420 DA |
541 | * @file_private: drm file-private structure to set up |
542 | * | |
543 | * Called at device open time, sets up the structure for handling refcounting | |
544 | * of sync objects. | |
545 | */ | |
546 | void | |
547 | drm_syncobj_open(struct drm_file *file_private) | |
548 | { | |
549 | idr_init(&file_private->syncobj_idr); | |
550 | spin_lock_init(&file_private->syncobj_table_lock); | |
551 | } | |
552 | ||
553 | static int | |
554 | drm_syncobj_release_handle(int id, void *ptr, void *data) | |
555 | { | |
556 | struct drm_syncobj *syncobj = ptr; | |
557 | ||
558 | drm_syncobj_put(syncobj); | |
559 | return 0; | |
560 | } | |
561 | ||
562 | /** | |
563 | * drm_syncobj_release - release file-private sync object resources | |
e9083420 DA |
564 | * @file_private: drm file-private structure to clean up |
565 | * | |
566 | * Called at close time when the filp is going away. | |
567 | * | |
568 | * Releases any remaining references on objects by this filp. | |
569 | */ | |
570 | void | |
571 | drm_syncobj_release(struct drm_file *file_private) | |
572 | { | |
573 | idr_for_each(&file_private->syncobj_idr, | |
574 | &drm_syncobj_release_handle, file_private); | |
575 | idr_destroy(&file_private->syncobj_idr); | |
576 | } | |
577 | ||
578 | int | |
579 | drm_syncobj_create_ioctl(struct drm_device *dev, void *data, | |
580 | struct drm_file *file_private) | |
581 | { | |
582 | struct drm_syncobj_create *args = data; | |
583 | ||
584 | if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) | |
585 | return -ENODEV; | |
586 | ||
587 | /* no valid flags yet */ | |
1fc08218 | 588 | if (args->flags & ~DRM_SYNCOBJ_CREATE_SIGNALED) |
e9083420 DA |
589 | return -EINVAL; |
590 | ||
1321fd2c MO |
591 | return drm_syncobj_create_as_handle(file_private, |
592 | &args->handle, args->flags); | |
e9083420 DA |
593 | } |
594 | ||
595 | int | |
596 | drm_syncobj_destroy_ioctl(struct drm_device *dev, void *data, | |
597 | struct drm_file *file_private) | |
598 | { | |
599 | struct drm_syncobj_destroy *args = data; | |
600 | ||
601 | if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) | |
602 | return -ENODEV; | |
603 | ||
604 | /* make sure padding is empty */ | |
605 | if (args->pad) | |
606 | return -EINVAL; | |
607 | return drm_syncobj_destroy(file_private, args->handle); | |
608 | } | |
609 | ||
610 | int | |
611 | drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data, | |
612 | struct drm_file *file_private) | |
613 | { | |
614 | struct drm_syncobj_handle *args = data; | |
615 | ||
616 | if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) | |
617 | return -ENODEV; | |
618 | ||
3ee45a3b | 619 | if (args->pad) |
e9083420 DA |
620 | return -EINVAL; |
621 | ||
3ee45a3b DA |
622 | if (args->flags != 0 && |
623 | args->flags != DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE) | |
624 | return -EINVAL; | |
625 | ||
626 | if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE) | |
627 | return drm_syncobj_export_sync_file(file_private, args->handle, | |
628 | &args->fd); | |
629 | ||
e9083420 DA |
630 | return drm_syncobj_handle_to_fd(file_private, args->handle, |
631 | &args->fd); | |
632 | } | |
633 | ||
634 | int | |
635 | drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data, | |
636 | struct drm_file *file_private) | |
637 | { | |
638 | struct drm_syncobj_handle *args = data; | |
639 | ||
640 | if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) | |
641 | return -ENODEV; | |
642 | ||
3ee45a3b DA |
643 | if (args->pad) |
644 | return -EINVAL; | |
645 | ||
646 | if (args->flags != 0 && | |
647 | args->flags != DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE) | |
e9083420 DA |
648 | return -EINVAL; |
649 | ||
3ee45a3b DA |
650 | if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE) |
651 | return drm_syncobj_import_sync_file_fence(file_private, | |
652 | args->fd, | |
653 | args->handle); | |
654 | ||
e9083420 DA |
655 | return drm_syncobj_fd_to_handle(file_private, args->fd, |
656 | &args->handle); | |
657 | } | |
5e60a10e | 658 | |
e7aca503 JE |
659 | struct syncobj_wait_entry { |
660 | struct task_struct *task; | |
661 | struct dma_fence *fence; | |
662 | struct dma_fence_cb fence_cb; | |
663 | struct drm_syncobj_cb syncobj_cb; | |
664 | }; | |
665 | ||
666 | static void syncobj_wait_fence_func(struct dma_fence *fence, | |
667 | struct dma_fence_cb *cb) | |
668 | { | |
669 | struct syncobj_wait_entry *wait = | |
670 | container_of(cb, struct syncobj_wait_entry, fence_cb); | |
671 | ||
672 | wake_up_process(wait->task); | |
673 | } | |
674 | ||
675 | static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj, | |
676 | struct drm_syncobj_cb *cb) | |
677 | { | |
678 | struct syncobj_wait_entry *wait = | |
679 | container_of(cb, struct syncobj_wait_entry, syncobj_cb); | |
680 | ||
681 | /* This happens inside the syncobj lock */ | |
563eaf53 VS |
682 | wait->fence = dma_fence_get(rcu_dereference_protected(syncobj->fence, |
683 | lockdep_is_held(&syncobj->lock))); | |
e7aca503 JE |
684 | wake_up_process(wait->task); |
685 | } | |
686 | ||
687 | static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs, | |
688 | uint32_t count, | |
689 | uint32_t flags, | |
690 | signed long timeout, | |
691 | uint32_t *idx) | |
692 | { | |
693 | struct syncobj_wait_entry *entries; | |
694 | struct dma_fence *fence; | |
695 | signed long ret; | |
696 | uint32_t signaled_count, i; | |
697 | ||
698 | entries = kcalloc(count, sizeof(*entries), GFP_KERNEL); | |
699 | if (!entries) | |
700 | return -ENOMEM; | |
701 | ||
702 | /* Walk the list of sync objects and initialize entries. We do | |
703 | * this up-front so that we can properly return -EINVAL if there is | |
704 | * a syncobj with a missing fence and then never have the chance of | |
705 | * returning -EINVAL again. | |
706 | */ | |
707 | signaled_count = 0; | |
708 | for (i = 0; i < count; ++i) { | |
709 | entries[i].task = current; | |
710 | entries[i].fence = drm_syncobj_fence_get(syncobjs[i]); | |
711 | if (!entries[i].fence) { | |
712 | if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) { | |
713 | continue; | |
714 | } else { | |
715 | ret = -EINVAL; | |
716 | goto cleanup_entries; | |
717 | } | |
718 | } | |
719 | ||
720 | if (dma_fence_is_signaled(entries[i].fence)) { | |
721 | if (signaled_count == 0 && idx) | |
722 | *idx = i; | |
723 | signaled_count++; | |
724 | } | |
725 | } | |
726 | ||
727 | /* Initialize ret to the max of timeout and 1. That way, the | |
728 | * default return value indicates a successful wait and not a | |
729 | * timeout. | |
730 | */ | |
731 | ret = max_t(signed long, timeout, 1); | |
732 | ||
733 | if (signaled_count == count || | |
734 | (signaled_count > 0 && | |
735 | !(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL))) | |
736 | goto cleanup_entries; | |
737 | ||
738 | /* There's a very annoying laxness in the dma_fence API here, in | |
739 | * that backends are not required to automatically report when a | |
740 | * fence is signaled prior to fence->ops->enable_signaling() being | |
741 | * called. So here if we fail to match signaled_count, we need to | |
742 | * fallthough and try a 0 timeout wait! | |
743 | */ | |
744 | ||
745 | if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) { | |
746 | for (i = 0; i < count; ++i) { | |
747 | drm_syncobj_fence_get_or_add_callback(syncobjs[i], | |
748 | &entries[i].fence, | |
749 | &entries[i].syncobj_cb, | |
750 | syncobj_wait_syncobj_func); | |
751 | } | |
752 | } | |
753 | ||
754 | do { | |
755 | set_current_state(TASK_INTERRUPTIBLE); | |
756 | ||
757 | signaled_count = 0; | |
758 | for (i = 0; i < count; ++i) { | |
759 | fence = entries[i].fence; | |
760 | if (!fence) | |
761 | continue; | |
762 | ||
763 | if (dma_fence_is_signaled(fence) || | |
764 | (!entries[i].fence_cb.func && | |
765 | dma_fence_add_callback(fence, | |
766 | &entries[i].fence_cb, | |
767 | syncobj_wait_fence_func))) { | |
768 | /* The fence has been signaled */ | |
769 | if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL) { | |
770 | signaled_count++; | |
771 | } else { | |
772 | if (idx) | |
773 | *idx = i; | |
774 | goto done_waiting; | |
775 | } | |
776 | } | |
777 | } | |
778 | ||
779 | if (signaled_count == count) | |
780 | goto done_waiting; | |
781 | ||
782 | if (timeout == 0) { | |
783 | /* If we are doing a 0 timeout wait and we got | |
784 | * here, then we just timed out. | |
785 | */ | |
786 | ret = 0; | |
787 | goto done_waiting; | |
788 | } | |
789 | ||
790 | ret = schedule_timeout(ret); | |
791 | ||
792 | if (ret > 0 && signal_pending(current)) | |
793 | ret = -ERESTARTSYS; | |
794 | } while (ret > 0); | |
795 | ||
796 | done_waiting: | |
797 | __set_current_state(TASK_RUNNING); | |
798 | ||
799 | cleanup_entries: | |
800 | for (i = 0; i < count; ++i) { | |
801 | if (entries[i].syncobj_cb.func) | |
802 | drm_syncobj_remove_callback(syncobjs[i], | |
803 | &entries[i].syncobj_cb); | |
804 | if (entries[i].fence_cb.func) | |
805 | dma_fence_remove_callback(entries[i].fence, | |
806 | &entries[i].fence_cb); | |
807 | dma_fence_put(entries[i].fence); | |
808 | } | |
809 | kfree(entries); | |
810 | ||
811 | return ret; | |
812 | } | |
813 | ||
5e60a10e DA |
814 | /** |
815 | * drm_timeout_abs_to_jiffies - calculate jiffies timeout from absolute value | |
816 | * | |
817 | * @timeout_nsec: timeout nsec component in ns, 0 for poll | |
818 | * | |
819 | * Calculate the timeout in jiffies from an absolute time in sec/nsec. | |
820 | */ | |
821 | static signed long drm_timeout_abs_to_jiffies(int64_t timeout_nsec) | |
822 | { | |
823 | ktime_t abs_timeout, now; | |
824 | u64 timeout_ns, timeout_jiffies64; | |
825 | ||
826 | /* make 0 timeout means poll - absolute 0 doesn't seem valid */ | |
827 | if (timeout_nsec == 0) | |
828 | return 0; | |
829 | ||
830 | abs_timeout = ns_to_ktime(timeout_nsec); | |
831 | now = ktime_get(); | |
832 | ||
833 | if (!ktime_after(abs_timeout, now)) | |
834 | return 0; | |
835 | ||
836 | timeout_ns = ktime_to_ns(ktime_sub(abs_timeout, now)); | |
837 | ||
838 | timeout_jiffies64 = nsecs_to_jiffies64(timeout_ns); | |
839 | /* clamp timeout to avoid infinite timeout */ | |
840 | if (timeout_jiffies64 >= MAX_SCHEDULE_TIMEOUT - 1) | |
841 | return MAX_SCHEDULE_TIMEOUT - 1; | |
842 | ||
843 | return timeout_jiffies64 + 1; | |
844 | } | |
845 | ||
e7aca503 JE |
846 | static int drm_syncobj_array_wait(struct drm_device *dev, |
847 | struct drm_file *file_private, | |
848 | struct drm_syncobj_wait *wait, | |
849 | struct drm_syncobj **syncobjs) | |
5e60a10e DA |
850 | { |
851 | signed long timeout = drm_timeout_abs_to_jiffies(wait->timeout_nsec); | |
852 | signed long ret = 0; | |
853 | uint32_t first = ~0; | |
854 | ||
e7aca503 JE |
855 | ret = drm_syncobj_array_wait_timeout(syncobjs, |
856 | wait->count_handles, | |
857 | wait->flags, | |
858 | timeout, &first); | |
5e60a10e DA |
859 | if (ret < 0) |
860 | return ret; | |
861 | ||
862 | wait->first_signaled = first; | |
863 | if (ret == 0) | |
864 | return -ETIME; | |
865 | return 0; | |
866 | } | |
867 | ||
3e6fb72d | 868 | static int drm_syncobj_array_find(struct drm_file *file_private, |
9e554462 VS |
869 | void __user *user_handles, |
870 | uint32_t count_handles, | |
3e6fb72d | 871 | struct drm_syncobj ***syncobjs_out) |
5e60a10e | 872 | { |
3e6fb72d | 873 | uint32_t i, *handles; |
e7aca503 | 874 | struct drm_syncobj **syncobjs; |
3e6fb72d | 875 | int ret; |
5e60a10e | 876 | |
3e6fb72d | 877 | handles = kmalloc_array(count_handles, sizeof(*handles), GFP_KERNEL); |
5e60a10e DA |
878 | if (handles == NULL) |
879 | return -ENOMEM; | |
880 | ||
3e6fb72d JE |
881 | if (copy_from_user(handles, user_handles, |
882 | sizeof(uint32_t) * count_handles)) { | |
5e60a10e DA |
883 | ret = -EFAULT; |
884 | goto err_free_handles; | |
885 | } | |
886 | ||
3e6fb72d JE |
887 | syncobjs = kmalloc_array(count_handles, sizeof(*syncobjs), GFP_KERNEL); |
888 | if (syncobjs == NULL) { | |
5e60a10e DA |
889 | ret = -ENOMEM; |
890 | goto err_free_handles; | |
891 | } | |
892 | ||
3e6fb72d | 893 | for (i = 0; i < count_handles; i++) { |
e7aca503 JE |
894 | syncobjs[i] = drm_syncobj_find(file_private, handles[i]); |
895 | if (!syncobjs[i]) { | |
896 | ret = -ENOENT; | |
3e6fb72d | 897 | goto err_put_syncobjs; |
e7aca503 | 898 | } |
5e60a10e DA |
899 | } |
900 | ||
3e6fb72d JE |
901 | kfree(handles); |
902 | *syncobjs_out = syncobjs; | |
903 | return 0; | |
5e60a10e | 904 | |
3e6fb72d | 905 | err_put_syncobjs: |
e7aca503 JE |
906 | while (i-- > 0) |
907 | drm_syncobj_put(syncobjs[i]); | |
908 | kfree(syncobjs); | |
5e60a10e DA |
909 | err_free_handles: |
910 | kfree(handles); | |
911 | ||
912 | return ret; | |
913 | } | |
3e6fb72d JE |
914 | |
915 | static void drm_syncobj_array_free(struct drm_syncobj **syncobjs, | |
916 | uint32_t count) | |
917 | { | |
918 | uint32_t i; | |
919 | for (i = 0; i < count; i++) | |
920 | drm_syncobj_put(syncobjs[i]); | |
921 | kfree(syncobjs); | |
922 | } | |
923 | ||
924 | int | |
925 | drm_syncobj_wait_ioctl(struct drm_device *dev, void *data, | |
926 | struct drm_file *file_private) | |
927 | { | |
928 | struct drm_syncobj_wait *args = data; | |
929 | struct drm_syncobj **syncobjs; | |
930 | int ret = 0; | |
931 | ||
932 | if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) | |
933 | return -ENODEV; | |
934 | ||
935 | if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL | | |
936 | DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT)) | |
937 | return -EINVAL; | |
938 | ||
939 | if (args->count_handles == 0) | |
940 | return -EINVAL; | |
941 | ||
942 | ret = drm_syncobj_array_find(file_private, | |
943 | u64_to_user_ptr(args->handles), | |
944 | args->count_handles, | |
945 | &syncobjs); | |
946 | if (ret < 0) | |
947 | return ret; | |
948 | ||
949 | ret = drm_syncobj_array_wait(dev, file_private, | |
950 | args, syncobjs); | |
951 | ||
952 | drm_syncobj_array_free(syncobjs, args->count_handles); | |
953 | ||
954 | return ret; | |
955 | } | |
aa4035d2 JE |
956 | |
957 | int | |
958 | drm_syncobj_reset_ioctl(struct drm_device *dev, void *data, | |
959 | struct drm_file *file_private) | |
960 | { | |
961 | struct drm_syncobj_array *args = data; | |
962 | struct drm_syncobj **syncobjs; | |
963 | uint32_t i; | |
964 | int ret; | |
965 | ||
966 | if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) | |
967 | return -ENODEV; | |
968 | ||
969 | if (args->pad != 0) | |
970 | return -EINVAL; | |
971 | ||
972 | if (args->count_handles == 0) | |
973 | return -EINVAL; | |
974 | ||
975 | ret = drm_syncobj_array_find(file_private, | |
976 | u64_to_user_ptr(args->handles), | |
977 | args->count_handles, | |
978 | &syncobjs); | |
979 | if (ret < 0) | |
980 | return ret; | |
981 | ||
982 | for (i = 0; i < args->count_handles; i++) | |
983 | drm_syncobj_replace_fence(syncobjs[i], NULL); | |
984 | ||
985 | drm_syncobj_array_free(syncobjs, args->count_handles); | |
986 | ||
987 | return 0; | |
988 | } | |
ffa9443f JE |
989 | |
990 | int | |
991 | drm_syncobj_signal_ioctl(struct drm_device *dev, void *data, | |
992 | struct drm_file *file_private) | |
993 | { | |
994 | struct drm_syncobj_array *args = data; | |
995 | struct drm_syncobj **syncobjs; | |
996 | uint32_t i; | |
997 | int ret; | |
998 | ||
999 | if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) | |
1000 | return -ENODEV; | |
1001 | ||
1002 | if (args->pad != 0) | |
1003 | return -EINVAL; | |
1004 | ||
1005 | if (args->count_handles == 0) | |
1006 | return -EINVAL; | |
1007 | ||
1008 | ret = drm_syncobj_array_find(file_private, | |
1009 | u64_to_user_ptr(args->handles), | |
1010 | args->count_handles, | |
1011 | &syncobjs); | |
1012 | if (ret < 0) | |
1013 | return ret; | |
1014 | ||
1015 | for (i = 0; i < args->count_handles; i++) { | |
1016 | ret = drm_syncobj_assign_null_handle(syncobjs[i]); | |
1017 | if (ret < 0) | |
1018 | break; | |
1019 | } | |
1020 | ||
1021 | drm_syncobj_array_free(syncobjs, args->count_handles); | |
1022 | ||
1023 | return ret; | |
1024 | } |