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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, 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.
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. The
65 * reference must be released by calling drm_syncobj_put().
66 */
67struct 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}
83EXPORT_SYMBOL(drm_syncobj_find);
84
85static 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
93static 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) {
110 *fence = dma_fence_get(rcu_dereference_protected(syncobj->fence,
111 lockdep_is_held(&syncobj->lock)));
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
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 */
131void 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}
139EXPORT_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 */
146void 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}
153EXPORT_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 */
162void 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 spin_lock(&syncobj->lock);
172
173 old_fence = rcu_dereference_protected(syncobj->fence,
174 lockdep_is_held(&syncobj->lock));
175 rcu_assign_pointer(syncobj->fence, fence);
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);
185
186 dma_fence_put(old_fence);
187}
188EXPORT_SYMBOL(drm_syncobj_replace_fence);
189
190struct drm_syncobj_null_fence {
191 struct dma_fence base;
192 spinlock_t lock;
193};
194
195static const char *drm_syncobj_null_fence_get_name(struct dma_fence *fence)
196{
197 return "syncobjnull";
198}
199
200static 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
206static 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
214static 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
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 */
246int drm_syncobj_find_fence(struct drm_file *file_private,
247 u32 handle,
248 struct dma_fence **fence)
249{
250 struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
251 int ret = 0;
252
253 if (!syncobj)
254 return -ENOENT;
255
256 *fence = drm_syncobj_fence_get(syncobj);
257 if (!*fence) {
258 ret = -EINVAL;
259 }
260 drm_syncobj_put(syncobj);
261 return ret;
262}
263EXPORT_SYMBOL(drm_syncobj_find_fence);
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 */
271void drm_syncobj_free(struct kref *kref)
272{
273 struct drm_syncobj *syncobj = container_of(kref,
274 struct drm_syncobj,
275 refcount);
276 drm_syncobj_replace_fence(syncobj, NULL);
277 kfree(syncobj);
278}
279EXPORT_SYMBOL(drm_syncobj_free);
280
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
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.
292 */
293int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
294 struct dma_fence *fence)
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);
304 INIT_LIST_HEAD(&syncobj->cb_list);
305 spin_lock_init(&syncobj->lock);
306
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
315 if (fence)
316 drm_syncobj_replace_fence(syncobj, fence);
317
318 *out_syncobj = syncobj;
319 return 0;
320}
321EXPORT_SYMBOL(drm_syncobj_create);
322
323/**
324 * drm_syncobj_get_handle - get a handle from a syncobj
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.
333 */
334int 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
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}
357EXPORT_SYMBOL(drm_syncobj_get_handle);
358
359static 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}
373
374static 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
390static 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
398static const struct file_operations drm_syncobj_file_fops = {
399 .release = drm_syncobj_file_release,
400};
401
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 */
411int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd)
412{
413 struct file *file;
414 int fd;
415
416 fd = get_unused_fd_flags(O_CLOEXEC);
417 if (fd < 0)
418 return fd;
419
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);
426 }
427
428 drm_syncobj_get(syncobj);
429 fd_install(fd, file);
430
431 *p_fd = fd;
432 return 0;
433}
434EXPORT_SYMBOL(drm_syncobj_get_fd);
435
436static 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);
446 drm_syncobj_put(syncobj);
447 return ret;
448}
449
450static int drm_syncobj_fd_to_handle(struct drm_file *file_private,
451 int fd, u32 *handle)
452{
453 struct drm_syncobj *syncobj;
454 struct file *file;
455 int ret;
456
457 file = fget(fd);
458 if (!file)
459 return -EINVAL;
460
461 if (file->f_op != &drm_syncobj_file_fops) {
462 fput(file);
463 return -EINVAL;
464 }
465
466 /* take a reference to put in the idr */
467 syncobj = file->private_data;
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
476 if (ret > 0) {
477 *handle = ret;
478 ret = 0;
479 } else
480 drm_syncobj_put(syncobj);
481
482 fput(file);
483 return ret;
484}
485
486static int drm_syncobj_import_sync_file_fence(struct drm_file *file_private,
487 int fd, int handle)
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
501 drm_syncobj_replace_fence(syncobj, fence);
502 dma_fence_put(fence);
503 drm_syncobj_put(syncobj);
504 return 0;
505}
506
507static int drm_syncobj_export_sync_file(struct drm_file *file_private,
508 int handle, int *p_fd)
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
518 ret = drm_syncobj_find_fence(file_private, handle, &fence);
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;
535err_put_fd:
536 put_unused_fd(fd);
537 return ret;
538}
539/**
540 * drm_syncobj_open - initalizes syncobj file-private structures at devnode open time
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 */
546void
547drm_syncobj_open(struct drm_file *file_private)
548{
549 idr_init_base(&file_private->syncobj_idr, 1);
550 spin_lock_init(&file_private->syncobj_table_lock);
551}
552
553static int
554drm_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
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 */
570void
571drm_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
578int
579drm_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 */
588 if (args->flags & ~DRM_SYNCOBJ_CREATE_SIGNALED)
589 return -EINVAL;
590
591 return drm_syncobj_create_as_handle(file_private,
592 &args->handle, args->flags);
593}
594
595int
596drm_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
610int
611drm_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
619 if (args->pad)
620 return -EINVAL;
621
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
630 return drm_syncobj_handle_to_fd(file_private, args->handle,
631 &args->fd);
632}
633
634int
635drm_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
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)
648 return -EINVAL;
649
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
655 return drm_syncobj_fd_to_handle(file_private, args->fd,
656 &args->handle);
657}
658
659struct 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
666static 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
675static 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 */
682 wait->fence = dma_fence_get(rcu_dereference_protected(syncobj->fence,
683 lockdep_is_held(&syncobj->lock)));
684 wake_up_process(wait->task);
685}
686
687static 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
796done_waiting:
797 __set_current_state(TASK_RUNNING);
798
799cleanup_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
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 */
821static 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
846static 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)
850{
851 signed long timeout = drm_timeout_abs_to_jiffies(wait->timeout_nsec);
852 signed long ret = 0;
853 uint32_t first = ~0;
854
855 ret = drm_syncobj_array_wait_timeout(syncobjs,
856 wait->count_handles,
857 wait->flags,
858 timeout, &first);
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
868static int drm_syncobj_array_find(struct drm_file *file_private,
869 void __user *user_handles,
870 uint32_t count_handles,
871 struct drm_syncobj ***syncobjs_out)
872{
873 uint32_t i, *handles;
874 struct drm_syncobj **syncobjs;
875 int ret;
876
877 handles = kmalloc_array(count_handles, sizeof(*handles), GFP_KERNEL);
878 if (handles == NULL)
879 return -ENOMEM;
880
881 if (copy_from_user(handles, user_handles,
882 sizeof(uint32_t) * count_handles)) {
883 ret = -EFAULT;
884 goto err_free_handles;
885 }
886
887 syncobjs = kmalloc_array(count_handles, sizeof(*syncobjs), GFP_KERNEL);
888 if (syncobjs == NULL) {
889 ret = -ENOMEM;
890 goto err_free_handles;
891 }
892
893 for (i = 0; i < count_handles; i++) {
894 syncobjs[i] = drm_syncobj_find(file_private, handles[i]);
895 if (!syncobjs[i]) {
896 ret = -ENOENT;
897 goto err_put_syncobjs;
898 }
899 }
900
901 kfree(handles);
902 *syncobjs_out = syncobjs;
903 return 0;
904
905err_put_syncobjs:
906 while (i-- > 0)
907 drm_syncobj_put(syncobjs[i]);
908 kfree(syncobjs);
909err_free_handles:
910 kfree(handles);
911
912 return ret;
913}
914
915static 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
924int
925drm_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}
956
957int
958drm_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}
989
990int
991drm_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}