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