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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) provide a
33 * container for a synchronization primitive which can be used by userspace
34 * to explicitly synchronize GPU commands, can be shared between userspace
35 * processes, and can be shared between different DRM drivers.
36 * Their primary use-case is to implement Vulkan fences and semaphores.
37 * The syncobj userspace API provides ioctls for several operations:
38 *
39 * - Creation and destruction of syncobjs
40 * - Import and export of syncobjs to/from a syncobj file descriptor
41 * - Import and export a syncobj's underlying fence to/from a sync file
42 * - Reset a syncobj (set its fence to NULL)
43 * - Signal a syncobj (set a trivially signaled fence)
44 * - Wait for a syncobj's fence to appear and be signaled
45 *
46 * The syncobj userspace API also provides operations to manipulate a syncobj
47 * in terms of a timeline of struct &dma_fence_chain rather than a single
48 * struct &dma_fence, through the following operations:
49 *
50 * - Signal a given point on the timeline
51 * - Wait for a given point to appear and/or be signaled
52 * - Import and export from/to a given point of a timeline
53 *
54 * At it's core, a syncobj is simply a wrapper around a pointer to a struct
55 * &dma_fence which may be NULL.
56 * When a syncobj is first created, its pointer is either NULL or a pointer
57 * to an already signaled fence depending on whether the
58 * &DRM_SYNCOBJ_CREATE_SIGNALED flag is passed to
59 * &DRM_IOCTL_SYNCOBJ_CREATE.
60 *
61 * If the syncobj is considered as a binary (its state is either signaled or
62 * unsignaled) primitive, when GPU work is enqueued in a DRM driver to signal
63 * the syncobj, the syncobj's fence is replaced with a fence which will be
64 * signaled by the completion of that work.
65 * If the syncobj is considered as a timeline primitive, when GPU work is
66 * enqueued in a DRM driver to signal the a given point of the syncobj, a new
67 * struct &dma_fence_chain pointing to the DRM driver's fence and also
68 * pointing to the previous fence that was in the syncobj. The new struct
69 * &dma_fence_chain fence replace the syncobj's fence and will be signaled by
70 * completion of the DRM driver's work and also any work associated with the
71 * fence previously in the syncobj.
72 *
73 * When GPU work which waits on a syncobj is enqueued in a DRM driver, at the
74 * time the work is enqueued, it waits on the syncobj's fence before
75 * submitting the work to hardware. That fence is either :
76 *
77 * - The syncobj's current fence if the syncobj is considered as a binary
78 * primitive.
79 * - The struct &dma_fence associated with a given point if the syncobj is
80 * considered as a timeline primitive.
81 *
82 * If the syncobj's fence is NULL or not present in the syncobj's timeline,
83 * the enqueue operation is expected to fail.
84 *
85 * With binary syncobj, all manipulation of the syncobjs's fence happens in
86 * terms of the current fence at the time the ioctl is called by userspace
87 * regardless of whether that operation is an immediate host-side operation
88 * (signal or reset) or or an operation which is enqueued in some driver
89 * queue. &DRM_IOCTL_SYNCOBJ_RESET and &DRM_IOCTL_SYNCOBJ_SIGNAL can be used
90 * to manipulate a syncobj from the host by resetting its pointer to NULL or
91 * setting its pointer to a fence which is already signaled.
92 *
93 * With a timeline syncobj, all manipulation of the synobj's fence happens in
94 * terms of a u64 value referring to point in the timeline. See
95 * dma_fence_chain_find_seqno() to see how a given point is found in the
96 * timeline.
97 *
98 * Note that applications should be careful to always use timeline set of
99 * ioctl() when dealing with syncobj considered as timeline. Using a binary
100 * set of ioctl() with a syncobj considered as timeline could result incorrect
101 * synchronization. The use of binary syncobj is supported through the
102 * timeline set of ioctl() by using a point value of 0, this will reproduce
103 * the behavior of the binary set of ioctl() (for example replace the
104 * syncobj's fence when signaling).
105 *
106 *
107 * Host-side wait on syncobjs
108 * --------------------------
109 *
110 * &DRM_IOCTL_SYNCOBJ_WAIT takes an array of syncobj handles and does a
111 * host-side wait on all of the syncobj fences simultaneously.
112 * If &DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL is set, the wait ioctl will wait on
113 * all of the syncobj fences to be signaled before it returns.
114 * Otherwise, it returns once at least one syncobj fence has been signaled
115 * and the index of a signaled fence is written back to the client.
116 *
117 * Unlike the enqueued GPU work dependencies which fail if they see a NULL
118 * fence in a syncobj, if &DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT is set,
119 * the host-side wait will first wait for the syncobj to receive a non-NULL
120 * fence and then wait on that fence.
121 * If &DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT is not set and any one of the
122 * syncobjs in the array has a NULL fence, -EINVAL will be returned.
123 * Assuming the syncobj starts off with a NULL fence, this allows a client
124 * to do a host wait in one thread (or process) which waits on GPU work
125 * submitted in another thread (or process) without having to manually
126 * synchronize between the two.
127 * This requirement is inherited from the Vulkan fence API.
128 *
129 * Similarly, &DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT takes an array of syncobj
130 * handles as well as an array of u64 points and does a host-side wait on all
131 * of syncobj fences at the given points simultaneously.
132 *
133 * &DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT also adds the ability to wait for a given
134 * fence to materialize on the timeline without waiting for the fence to be
135 * signaled by using the &DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE flag. This
136 * requirement is inherited from the wait-before-signal behavior required by
137 * the Vulkan timeline semaphore API.
138 *
139 *
140 * Import/export of syncobjs
141 * -------------------------
142 *
143 * &DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE and &DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD
144 * provide two mechanisms for import/export of syncobjs.
145 *
146 * The first lets the client import or export an entire syncobj to a file
147 * descriptor.
148 * These fd's are opaque and have no other use case, except passing the
149 * syncobj between processes.
150 * All exported file descriptors and any syncobj handles created as a
151 * result of importing those file descriptors own a reference to the
152 * same underlying struct &drm_syncobj and the syncobj can be used
153 * persistently across all the processes with which it is shared.
154 * The syncobj is freed only once the last reference is dropped.
155 * Unlike dma-buf, importing a syncobj creates a new handle (with its own
156 * reference) for every import instead of de-duplicating.
157 * The primary use-case of this persistent import/export is for shared
158 * Vulkan fences and semaphores.
159 *
160 * The second import/export mechanism, which is indicated by
161 * &DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE or
162 * &DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE lets the client
163 * import/export the syncobj's current fence from/to a &sync_file.
164 * When a syncobj is exported to a sync file, that sync file wraps the
165 * sycnobj's fence at the time of export and any later signal or reset
166 * operations on the syncobj will not affect the exported sync file.
167 * When a sync file is imported into a syncobj, the syncobj's fence is set
168 * to the fence wrapped by that sync file.
169 * Because sync files are immutable, resetting or signaling the syncobj
170 * will not affect any sync files whose fences have been imported into the
171 * syncobj.
172 *
173 *
174 * Import/export of timeline points in timeline syncobjs
175 * -----------------------------------------------------
176 *
177 * &DRM_IOCTL_SYNCOBJ_TRANSFER provides a mechanism to transfer a struct
178 * &dma_fence_chain of a syncobj at a given u64 point to another u64 point
179 * into another syncobj.
180 *
181 * Note that if you want to transfer a struct &dma_fence_chain from a given
182 * point on a timeline syncobj from/into a binary syncobj, you can use the
183 * point 0 to mean take/replace the fence in the syncobj.
184 */
185
186#include <linux/anon_inodes.h>
187#include <linux/file.h>
188#include <linux/fs.h>
189#include <linux/sched/signal.h>
190#include <linux/sync_file.h>
191#include <linux/uaccess.h>
192
193#include <drm/drm.h>
194#include <drm/drm_drv.h>
195#include <drm/drm_file.h>
196#include <drm/drm_gem.h>
197#include <drm/drm_print.h>
198#include <drm/drm_syncobj.h>
199#include <drm/drm_utils.h>
200
201#include "drm_internal.h"
202
203struct syncobj_wait_entry {
204 struct list_head node;
205 struct task_struct *task;
206 struct dma_fence *fence;
207 struct dma_fence_cb fence_cb;
208 u64 point;
209};
210
211static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
212 struct syncobj_wait_entry *wait);
213
214/**
215 * drm_syncobj_find - lookup and reference a sync object.
216 * @file_private: drm file private pointer
217 * @handle: sync object handle to lookup.
218 *
219 * Returns a reference to the syncobj pointed to by handle or NULL. The
220 * reference must be released by calling drm_syncobj_put().
221 */
222struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
223 u32 handle)
224{
225 struct drm_syncobj *syncobj;
226
227 spin_lock(&file_private->syncobj_table_lock);
228
229 /* Check if we currently have a reference on the object */
230 syncobj = idr_find(&file_private->syncobj_idr, handle);
231 if (syncobj)
232 drm_syncobj_get(syncobj);
233
234 spin_unlock(&file_private->syncobj_table_lock);
235
236 return syncobj;
237}
238EXPORT_SYMBOL(drm_syncobj_find);
239
240static void drm_syncobj_fence_add_wait(struct drm_syncobj *syncobj,
241 struct syncobj_wait_entry *wait)
242{
243 struct dma_fence *fence;
244
245 if (wait->fence)
246 return;
247
248 spin_lock(&syncobj->lock);
249 /* We've already tried once to get a fence and failed. Now that we
250 * have the lock, try one more time just to be sure we don't add a
251 * callback when a fence has already been set.
252 */
253 fence = dma_fence_get(rcu_dereference_protected(syncobj->fence, 1));
254 if (!fence || dma_fence_chain_find_seqno(&fence, wait->point)) {
255 dma_fence_put(fence);
256 list_add_tail(&wait->node, &syncobj->cb_list);
257 } else if (!fence) {
258 wait->fence = dma_fence_get_stub();
259 } else {
260 wait->fence = fence;
261 }
262 spin_unlock(&syncobj->lock);
263}
264
265static void drm_syncobj_remove_wait(struct drm_syncobj *syncobj,
266 struct syncobj_wait_entry *wait)
267{
268 if (!wait->node.next)
269 return;
270
271 spin_lock(&syncobj->lock);
272 list_del_init(&wait->node);
273 spin_unlock(&syncobj->lock);
274}
275
276/**
277 * drm_syncobj_add_point - add new timeline point to the syncobj
278 * @syncobj: sync object to add timeline point do
279 * @chain: chain node to use to add the point
280 * @fence: fence to encapsulate in the chain node
281 * @point: sequence number to use for the point
282 *
283 * Add the chain node as new timeline point to the syncobj.
284 */
285void drm_syncobj_add_point(struct drm_syncobj *syncobj,
286 struct dma_fence_chain *chain,
287 struct dma_fence *fence,
288 uint64_t point)
289{
290 struct syncobj_wait_entry *cur, *tmp;
291 struct dma_fence *prev;
292
293 dma_fence_get(fence);
294
295 spin_lock(&syncobj->lock);
296
297 prev = drm_syncobj_fence_get(syncobj);
298 /* You are adding an unorder point to timeline, which could cause payload returned from query_ioctl is 0! */
299 if (prev && prev->seqno >= point)
300 DRM_ERROR("You are adding an unorder point to timeline!\n");
301 dma_fence_chain_init(chain, prev, fence, point);
302 rcu_assign_pointer(syncobj->fence, &chain->base);
303
304 list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node)
305 syncobj_wait_syncobj_func(syncobj, cur);
306 spin_unlock(&syncobj->lock);
307
308 /* Walk the chain once to trigger garbage collection */
309 dma_fence_chain_for_each(fence, prev);
310 dma_fence_put(prev);
311}
312EXPORT_SYMBOL(drm_syncobj_add_point);
313
314/**
315 * drm_syncobj_replace_fence - replace fence in a sync object.
316 * @syncobj: Sync object to replace fence in
317 * @fence: fence to install in sync file.
318 *
319 * This replaces the fence on a sync object.
320 */
321void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
322 struct dma_fence *fence)
323{
324 struct dma_fence *old_fence;
325 struct syncobj_wait_entry *cur, *tmp;
326
327 if (fence)
328 dma_fence_get(fence);
329
330 spin_lock(&syncobj->lock);
331
332 old_fence = rcu_dereference_protected(syncobj->fence,
333 lockdep_is_held(&syncobj->lock));
334 rcu_assign_pointer(syncobj->fence, fence);
335
336 if (fence != old_fence) {
337 list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node)
338 syncobj_wait_syncobj_func(syncobj, cur);
339 }
340
341 spin_unlock(&syncobj->lock);
342
343 dma_fence_put(old_fence);
344}
345EXPORT_SYMBOL(drm_syncobj_replace_fence);
346
347/**
348 * drm_syncobj_assign_null_handle - assign a stub fence to the sync object
349 * @syncobj: sync object to assign the fence on
350 *
351 * Assign a already signaled stub fence to the sync object.
352 */
353static void drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj)
354{
355 struct dma_fence *fence = dma_fence_get_stub();
356
357 drm_syncobj_replace_fence(syncobj, fence);
358 dma_fence_put(fence);
359}
360
361/* 5s default for wait submission */
362#define DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT 5000000000ULL
363/**
364 * drm_syncobj_find_fence - lookup and reference the fence in a sync object
365 * @file_private: drm file private pointer
366 * @handle: sync object handle to lookup.
367 * @point: timeline point
368 * @flags: DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT or not
369 * @fence: out parameter for the fence
370 *
371 * This is just a convenience function that combines drm_syncobj_find() and
372 * drm_syncobj_fence_get().
373 *
374 * Returns 0 on success or a negative error value on failure. On success @fence
375 * contains a reference to the fence, which must be released by calling
376 * dma_fence_put().
377 */
378int drm_syncobj_find_fence(struct drm_file *file_private,
379 u32 handle, u64 point, u64 flags,
380 struct dma_fence **fence)
381{
382 struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
383 struct syncobj_wait_entry wait;
384 u64 timeout = nsecs_to_jiffies64(DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT);
385 int ret;
386
387 if (!syncobj)
388 return -ENOENT;
389
390 *fence = drm_syncobj_fence_get(syncobj);
391 drm_syncobj_put(syncobj);
392
393 if (*fence) {
394 ret = dma_fence_chain_find_seqno(fence, point);
395 if (!ret)
396 return 0;
397 dma_fence_put(*fence);
398 } else {
399 ret = -EINVAL;
400 }
401
402 if (!(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT))
403 return ret;
404
405 memset(&wait, 0, sizeof(wait));
406 wait.task = current;
407 wait.point = point;
408 drm_syncobj_fence_add_wait(syncobj, &wait);
409
410 do {
411 set_current_state(TASK_INTERRUPTIBLE);
412 if (wait.fence) {
413 ret = 0;
414 break;
415 }
416 if (timeout == 0) {
417 ret = -ETIME;
418 break;
419 }
420
421 if (signal_pending(current)) {
422 ret = -ERESTARTSYS;
423 break;
424 }
425
426 timeout = schedule_timeout(timeout);
427 } while (1);
428
429 __set_current_state(TASK_RUNNING);
430 *fence = wait.fence;
431
432 if (wait.node.next)
433 drm_syncobj_remove_wait(syncobj, &wait);
434
435 return ret;
436}
437EXPORT_SYMBOL(drm_syncobj_find_fence);
438
439/**
440 * drm_syncobj_free - free a sync object.
441 * @kref: kref to free.
442 *
443 * Only to be called from kref_put in drm_syncobj_put.
444 */
445void drm_syncobj_free(struct kref *kref)
446{
447 struct drm_syncobj *syncobj = container_of(kref,
448 struct drm_syncobj,
449 refcount);
450 drm_syncobj_replace_fence(syncobj, NULL);
451 kfree(syncobj);
452}
453EXPORT_SYMBOL(drm_syncobj_free);
454
455/**
456 * drm_syncobj_create - create a new syncobj
457 * @out_syncobj: returned syncobj
458 * @flags: DRM_SYNCOBJ_* flags
459 * @fence: if non-NULL, the syncobj will represent this fence
460 *
461 * This is the first function to create a sync object. After creating, drivers
462 * probably want to make it available to userspace, either through
463 * drm_syncobj_get_handle() or drm_syncobj_get_fd().
464 *
465 * Returns 0 on success or a negative error value on failure.
466 */
467int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
468 struct dma_fence *fence)
469{
470 struct drm_syncobj *syncobj;
471
472 syncobj = kzalloc(sizeof(struct drm_syncobj), GFP_KERNEL);
473 if (!syncobj)
474 return -ENOMEM;
475
476 kref_init(&syncobj->refcount);
477 INIT_LIST_HEAD(&syncobj->cb_list);
478 spin_lock_init(&syncobj->lock);
479
480 if (flags & DRM_SYNCOBJ_CREATE_SIGNALED)
481 drm_syncobj_assign_null_handle(syncobj);
482
483 if (fence)
484 drm_syncobj_replace_fence(syncobj, fence);
485
486 *out_syncobj = syncobj;
487 return 0;
488}
489EXPORT_SYMBOL(drm_syncobj_create);
490
491/**
492 * drm_syncobj_get_handle - get a handle from a syncobj
493 * @file_private: drm file private pointer
494 * @syncobj: Sync object to export
495 * @handle: out parameter with the new handle
496 *
497 * Exports a sync object created with drm_syncobj_create() as a handle on
498 * @file_private to userspace.
499 *
500 * Returns 0 on success or a negative error value on failure.
501 */
502int drm_syncobj_get_handle(struct drm_file *file_private,
503 struct drm_syncobj *syncobj, u32 *handle)
504{
505 int ret;
506
507 /* take a reference to put in the idr */
508 drm_syncobj_get(syncobj);
509
510 idr_preload(GFP_KERNEL);
511 spin_lock(&file_private->syncobj_table_lock);
512 ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
513 spin_unlock(&file_private->syncobj_table_lock);
514
515 idr_preload_end();
516
517 if (ret < 0) {
518 drm_syncobj_put(syncobj);
519 return ret;
520 }
521
522 *handle = ret;
523 return 0;
524}
525EXPORT_SYMBOL(drm_syncobj_get_handle);
526
527static int drm_syncobj_create_as_handle(struct drm_file *file_private,
528 u32 *handle, uint32_t flags)
529{
530 int ret;
531 struct drm_syncobj *syncobj;
532
533 ret = drm_syncobj_create(&syncobj, flags, NULL);
534 if (ret)
535 return ret;
536
537 ret = drm_syncobj_get_handle(file_private, syncobj, handle);
538 drm_syncobj_put(syncobj);
539 return ret;
540}
541
542static int drm_syncobj_destroy(struct drm_file *file_private,
543 u32 handle)
544{
545 struct drm_syncobj *syncobj;
546
547 spin_lock(&file_private->syncobj_table_lock);
548 syncobj = idr_remove(&file_private->syncobj_idr, handle);
549 spin_unlock(&file_private->syncobj_table_lock);
550
551 if (!syncobj)
552 return -EINVAL;
553
554 drm_syncobj_put(syncobj);
555 return 0;
556}
557
558static int drm_syncobj_file_release(struct inode *inode, struct file *file)
559{
560 struct drm_syncobj *syncobj = file->private_data;
561
562 drm_syncobj_put(syncobj);
563 return 0;
564}
565
566static const struct file_operations drm_syncobj_file_fops = {
567 .release = drm_syncobj_file_release,
568};
569
570/**
571 * drm_syncobj_get_fd - get a file descriptor from a syncobj
572 * @syncobj: Sync object to export
573 * @p_fd: out parameter with the new file descriptor
574 *
575 * Exports a sync object created with drm_syncobj_create() as a file descriptor.
576 *
577 * Returns 0 on success or a negative error value on failure.
578 */
579int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd)
580{
581 struct file *file;
582 int fd;
583
584 fd = get_unused_fd_flags(O_CLOEXEC);
585 if (fd < 0)
586 return fd;
587
588 file = anon_inode_getfile("syncobj_file",
589 &drm_syncobj_file_fops,
590 syncobj, 0);
591 if (IS_ERR(file)) {
592 put_unused_fd(fd);
593 return PTR_ERR(file);
594 }
595
596 drm_syncobj_get(syncobj);
597 fd_install(fd, file);
598
599 *p_fd = fd;
600 return 0;
601}
602EXPORT_SYMBOL(drm_syncobj_get_fd);
603
604static int drm_syncobj_handle_to_fd(struct drm_file *file_private,
605 u32 handle, int *p_fd)
606{
607 struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
608 int ret;
609
610 if (!syncobj)
611 return -EINVAL;
612
613 ret = drm_syncobj_get_fd(syncobj, p_fd);
614 drm_syncobj_put(syncobj);
615 return ret;
616}
617
618static int drm_syncobj_fd_to_handle(struct drm_file *file_private,
619 int fd, u32 *handle)
620{
621 struct drm_syncobj *syncobj;
622 struct fd f = fdget(fd);
623 int ret;
624
625 if (!f.file)
626 return -EINVAL;
627
628 if (f.file->f_op != &drm_syncobj_file_fops) {
629 fdput(f);
630 return -EINVAL;
631 }
632
633 /* take a reference to put in the idr */
634 syncobj = f.file->private_data;
635 drm_syncobj_get(syncobj);
636
637 idr_preload(GFP_KERNEL);
638 spin_lock(&file_private->syncobj_table_lock);
639 ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
640 spin_unlock(&file_private->syncobj_table_lock);
641 idr_preload_end();
642
643 if (ret > 0) {
644 *handle = ret;
645 ret = 0;
646 } else
647 drm_syncobj_put(syncobj);
648
649 fdput(f);
650 return ret;
651}
652
653static int drm_syncobj_import_sync_file_fence(struct drm_file *file_private,
654 int fd, int handle)
655{
656 struct dma_fence *fence = sync_file_get_fence(fd);
657 struct drm_syncobj *syncobj;
658
659 if (!fence)
660 return -EINVAL;
661
662 syncobj = drm_syncobj_find(file_private, handle);
663 if (!syncobj) {
664 dma_fence_put(fence);
665 return -ENOENT;
666 }
667
668 drm_syncobj_replace_fence(syncobj, fence);
669 dma_fence_put(fence);
670 drm_syncobj_put(syncobj);
671 return 0;
672}
673
674static int drm_syncobj_export_sync_file(struct drm_file *file_private,
675 int handle, int *p_fd)
676{
677 int ret;
678 struct dma_fence *fence;
679 struct sync_file *sync_file;
680 int fd = get_unused_fd_flags(O_CLOEXEC);
681
682 if (fd < 0)
683 return fd;
684
685 ret = drm_syncobj_find_fence(file_private, handle, 0, 0, &fence);
686 if (ret)
687 goto err_put_fd;
688
689 sync_file = sync_file_create(fence);
690
691 dma_fence_put(fence);
692
693 if (!sync_file) {
694 ret = -EINVAL;
695 goto err_put_fd;
696 }
697
698 fd_install(fd, sync_file->file);
699
700 *p_fd = fd;
701 return 0;
702err_put_fd:
703 put_unused_fd(fd);
704 return ret;
705}
706/**
707 * drm_syncobj_open - initalizes syncobj file-private structures at devnode open time
708 * @file_private: drm file-private structure to set up
709 *
710 * Called at device open time, sets up the structure for handling refcounting
711 * of sync objects.
712 */
713void
714drm_syncobj_open(struct drm_file *file_private)
715{
716 idr_init_base(&file_private->syncobj_idr, 1);
717 spin_lock_init(&file_private->syncobj_table_lock);
718}
719
720static int
721drm_syncobj_release_handle(int id, void *ptr, void *data)
722{
723 struct drm_syncobj *syncobj = ptr;
724
725 drm_syncobj_put(syncobj);
726 return 0;
727}
728
729/**
730 * drm_syncobj_release - release file-private sync object resources
731 * @file_private: drm file-private structure to clean up
732 *
733 * Called at close time when the filp is going away.
734 *
735 * Releases any remaining references on objects by this filp.
736 */
737void
738drm_syncobj_release(struct drm_file *file_private)
739{
740 idr_for_each(&file_private->syncobj_idr,
741 &drm_syncobj_release_handle, file_private);
742 idr_destroy(&file_private->syncobj_idr);
743}
744
745int
746drm_syncobj_create_ioctl(struct drm_device *dev, void *data,
747 struct drm_file *file_private)
748{
749 struct drm_syncobj_create *args = data;
750
751 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
752 return -EOPNOTSUPP;
753
754 /* no valid flags yet */
755 if (args->flags & ~DRM_SYNCOBJ_CREATE_SIGNALED)
756 return -EINVAL;
757
758 return drm_syncobj_create_as_handle(file_private,
759 &args->handle, args->flags);
760}
761
762int
763drm_syncobj_destroy_ioctl(struct drm_device *dev, void *data,
764 struct drm_file *file_private)
765{
766 struct drm_syncobj_destroy *args = data;
767
768 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
769 return -EOPNOTSUPP;
770
771 /* make sure padding is empty */
772 if (args->pad)
773 return -EINVAL;
774 return drm_syncobj_destroy(file_private, args->handle);
775}
776
777int
778drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data,
779 struct drm_file *file_private)
780{
781 struct drm_syncobj_handle *args = data;
782
783 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
784 return -EOPNOTSUPP;
785
786 if (args->pad)
787 return -EINVAL;
788
789 if (args->flags != 0 &&
790 args->flags != DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
791 return -EINVAL;
792
793 if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
794 return drm_syncobj_export_sync_file(file_private, args->handle,
795 &args->fd);
796
797 return drm_syncobj_handle_to_fd(file_private, args->handle,
798 &args->fd);
799}
800
801int
802drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
803 struct drm_file *file_private)
804{
805 struct drm_syncobj_handle *args = data;
806
807 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
808 return -EOPNOTSUPP;
809
810 if (args->pad)
811 return -EINVAL;
812
813 if (args->flags != 0 &&
814 args->flags != DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE)
815 return -EINVAL;
816
817 if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE)
818 return drm_syncobj_import_sync_file_fence(file_private,
819 args->fd,
820 args->handle);
821
822 return drm_syncobj_fd_to_handle(file_private, args->fd,
823 &args->handle);
824}
825
826static int drm_syncobj_transfer_to_timeline(struct drm_file *file_private,
827 struct drm_syncobj_transfer *args)
828{
829 struct drm_syncobj *timeline_syncobj = NULL;
830 struct dma_fence *fence;
831 struct dma_fence_chain *chain;
832 int ret;
833
834 timeline_syncobj = drm_syncobj_find(file_private, args->dst_handle);
835 if (!timeline_syncobj) {
836 return -ENOENT;
837 }
838 ret = drm_syncobj_find_fence(file_private, args->src_handle,
839 args->src_point, args->flags,
840 &fence);
841 if (ret)
842 goto err;
843 chain = kzalloc(sizeof(struct dma_fence_chain), GFP_KERNEL);
844 if (!chain) {
845 ret = -ENOMEM;
846 goto err1;
847 }
848 drm_syncobj_add_point(timeline_syncobj, chain, fence, args->dst_point);
849err1:
850 dma_fence_put(fence);
851err:
852 drm_syncobj_put(timeline_syncobj);
853
854 return ret;
855}
856
857static int
858drm_syncobj_transfer_to_binary(struct drm_file *file_private,
859 struct drm_syncobj_transfer *args)
860{
861 struct drm_syncobj *binary_syncobj = NULL;
862 struct dma_fence *fence;
863 int ret;
864
865 binary_syncobj = drm_syncobj_find(file_private, args->dst_handle);
866 if (!binary_syncobj)
867 return -ENOENT;
868 ret = drm_syncobj_find_fence(file_private, args->src_handle,
869 args->src_point, args->flags, &fence);
870 if (ret)
871 goto err;
872 drm_syncobj_replace_fence(binary_syncobj, fence);
873 dma_fence_put(fence);
874err:
875 drm_syncobj_put(binary_syncobj);
876
877 return ret;
878}
879int
880drm_syncobj_transfer_ioctl(struct drm_device *dev, void *data,
881 struct drm_file *file_private)
882{
883 struct drm_syncobj_transfer *args = data;
884 int ret;
885
886 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
887 return -EOPNOTSUPP;
888
889 if (args->pad)
890 return -EINVAL;
891
892 if (args->dst_point)
893 ret = drm_syncobj_transfer_to_timeline(file_private, args);
894 else
895 ret = drm_syncobj_transfer_to_binary(file_private, args);
896
897 return ret;
898}
899
900static void syncobj_wait_fence_func(struct dma_fence *fence,
901 struct dma_fence_cb *cb)
902{
903 struct syncobj_wait_entry *wait =
904 container_of(cb, struct syncobj_wait_entry, fence_cb);
905
906 wake_up_process(wait->task);
907}
908
909static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
910 struct syncobj_wait_entry *wait)
911{
912 struct dma_fence *fence;
913
914 /* This happens inside the syncobj lock */
915 fence = rcu_dereference_protected(syncobj->fence,
916 lockdep_is_held(&syncobj->lock));
917 dma_fence_get(fence);
918 if (!fence || dma_fence_chain_find_seqno(&fence, wait->point)) {
919 dma_fence_put(fence);
920 return;
921 } else if (!fence) {
922 wait->fence = dma_fence_get_stub();
923 } else {
924 wait->fence = fence;
925 }
926
927 wake_up_process(wait->task);
928 list_del_init(&wait->node);
929}
930
931static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
932 void __user *user_points,
933 uint32_t count,
934 uint32_t flags,
935 signed long timeout,
936 uint32_t *idx)
937{
938 struct syncobj_wait_entry *entries;
939 struct dma_fence *fence;
940 uint64_t *points;
941 uint32_t signaled_count, i;
942
943 points = kmalloc_array(count, sizeof(*points), GFP_KERNEL);
944 if (points == NULL)
945 return -ENOMEM;
946
947 if (!user_points) {
948 memset(points, 0, count * sizeof(uint64_t));
949
950 } else if (copy_from_user(points, user_points,
951 sizeof(uint64_t) * count)) {
952 timeout = -EFAULT;
953 goto err_free_points;
954 }
955
956 entries = kcalloc(count, sizeof(*entries), GFP_KERNEL);
957 if (!entries) {
958 timeout = -ENOMEM;
959 goto err_free_points;
960 }
961 /* Walk the list of sync objects and initialize entries. We do
962 * this up-front so that we can properly return -EINVAL if there is
963 * a syncobj with a missing fence and then never have the chance of
964 * returning -EINVAL again.
965 */
966 signaled_count = 0;
967 for (i = 0; i < count; ++i) {
968 struct dma_fence *fence;
969
970 entries[i].task = current;
971 entries[i].point = points[i];
972 fence = drm_syncobj_fence_get(syncobjs[i]);
973 if (!fence || dma_fence_chain_find_seqno(&fence, points[i])) {
974 dma_fence_put(fence);
975 if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
976 continue;
977 } else {
978 timeout = -EINVAL;
979 goto cleanup_entries;
980 }
981 }
982
983 if (fence)
984 entries[i].fence = fence;
985 else
986 entries[i].fence = dma_fence_get_stub();
987
988 if ((flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) ||
989 dma_fence_is_signaled(entries[i].fence)) {
990 if (signaled_count == 0 && idx)
991 *idx = i;
992 signaled_count++;
993 }
994 }
995
996 if (signaled_count == count ||
997 (signaled_count > 0 &&
998 !(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL)))
999 goto cleanup_entries;
1000
1001 /* There's a very annoying laxness in the dma_fence API here, in
1002 * that backends are not required to automatically report when a
1003 * fence is signaled prior to fence->ops->enable_signaling() being
1004 * called. So here if we fail to match signaled_count, we need to
1005 * fallthough and try a 0 timeout wait!
1006 */
1007
1008 if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
1009 for (i = 0; i < count; ++i)
1010 drm_syncobj_fence_add_wait(syncobjs[i], &entries[i]);
1011 }
1012
1013 do {
1014 set_current_state(TASK_INTERRUPTIBLE);
1015
1016 signaled_count = 0;
1017 for (i = 0; i < count; ++i) {
1018 fence = entries[i].fence;
1019 if (!fence)
1020 continue;
1021
1022 if ((flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) ||
1023 dma_fence_is_signaled(fence) ||
1024 (!entries[i].fence_cb.func &&
1025 dma_fence_add_callback(fence,
1026 &entries[i].fence_cb,
1027 syncobj_wait_fence_func))) {
1028 /* The fence has been signaled */
1029 if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL) {
1030 signaled_count++;
1031 } else {
1032 if (idx)
1033 *idx = i;
1034 goto done_waiting;
1035 }
1036 }
1037 }
1038
1039 if (signaled_count == count)
1040 goto done_waiting;
1041
1042 if (timeout == 0) {
1043 timeout = -ETIME;
1044 goto done_waiting;
1045 }
1046
1047 if (signal_pending(current)) {
1048 timeout = -ERESTARTSYS;
1049 goto done_waiting;
1050 }
1051
1052 timeout = schedule_timeout(timeout);
1053 } while (1);
1054
1055done_waiting:
1056 __set_current_state(TASK_RUNNING);
1057
1058cleanup_entries:
1059 for (i = 0; i < count; ++i) {
1060 drm_syncobj_remove_wait(syncobjs[i], &entries[i]);
1061 if (entries[i].fence_cb.func)
1062 dma_fence_remove_callback(entries[i].fence,
1063 &entries[i].fence_cb);
1064 dma_fence_put(entries[i].fence);
1065 }
1066 kfree(entries);
1067
1068err_free_points:
1069 kfree(points);
1070
1071 return timeout;
1072}
1073
1074/**
1075 * drm_timeout_abs_to_jiffies - calculate jiffies timeout from absolute value
1076 *
1077 * @timeout_nsec: timeout nsec component in ns, 0 for poll
1078 *
1079 * Calculate the timeout in jiffies from an absolute time in sec/nsec.
1080 */
1081signed long drm_timeout_abs_to_jiffies(int64_t timeout_nsec)
1082{
1083 ktime_t abs_timeout, now;
1084 u64 timeout_ns, timeout_jiffies64;
1085
1086 /* make 0 timeout means poll - absolute 0 doesn't seem valid */
1087 if (timeout_nsec == 0)
1088 return 0;
1089
1090 abs_timeout = ns_to_ktime(timeout_nsec);
1091 now = ktime_get();
1092
1093 if (!ktime_after(abs_timeout, now))
1094 return 0;
1095
1096 timeout_ns = ktime_to_ns(ktime_sub(abs_timeout, now));
1097
1098 timeout_jiffies64 = nsecs_to_jiffies64(timeout_ns);
1099 /* clamp timeout to avoid infinite timeout */
1100 if (timeout_jiffies64 >= MAX_SCHEDULE_TIMEOUT - 1)
1101 return MAX_SCHEDULE_TIMEOUT - 1;
1102
1103 return timeout_jiffies64 + 1;
1104}
1105EXPORT_SYMBOL(drm_timeout_abs_to_jiffies);
1106
1107static int drm_syncobj_array_wait(struct drm_device *dev,
1108 struct drm_file *file_private,
1109 struct drm_syncobj_wait *wait,
1110 struct drm_syncobj_timeline_wait *timeline_wait,
1111 struct drm_syncobj **syncobjs, bool timeline)
1112{
1113 signed long timeout = 0;
1114 uint32_t first = ~0;
1115
1116 if (!timeline) {
1117 timeout = drm_timeout_abs_to_jiffies(wait->timeout_nsec);
1118 timeout = drm_syncobj_array_wait_timeout(syncobjs,
1119 NULL,
1120 wait->count_handles,
1121 wait->flags,
1122 timeout, &first);
1123 if (timeout < 0)
1124 return timeout;
1125 wait->first_signaled = first;
1126 } else {
1127 timeout = drm_timeout_abs_to_jiffies(timeline_wait->timeout_nsec);
1128 timeout = drm_syncobj_array_wait_timeout(syncobjs,
1129 u64_to_user_ptr(timeline_wait->points),
1130 timeline_wait->count_handles,
1131 timeline_wait->flags,
1132 timeout, &first);
1133 if (timeout < 0)
1134 return timeout;
1135 timeline_wait->first_signaled = first;
1136 }
1137 return 0;
1138}
1139
1140static int drm_syncobj_array_find(struct drm_file *file_private,
1141 void __user *user_handles,
1142 uint32_t count_handles,
1143 struct drm_syncobj ***syncobjs_out)
1144{
1145 uint32_t i, *handles;
1146 struct drm_syncobj **syncobjs;
1147 int ret;
1148
1149 handles = kmalloc_array(count_handles, sizeof(*handles), GFP_KERNEL);
1150 if (handles == NULL)
1151 return -ENOMEM;
1152
1153 if (copy_from_user(handles, user_handles,
1154 sizeof(uint32_t) * count_handles)) {
1155 ret = -EFAULT;
1156 goto err_free_handles;
1157 }
1158
1159 syncobjs = kmalloc_array(count_handles, sizeof(*syncobjs), GFP_KERNEL);
1160 if (syncobjs == NULL) {
1161 ret = -ENOMEM;
1162 goto err_free_handles;
1163 }
1164
1165 for (i = 0; i < count_handles; i++) {
1166 syncobjs[i] = drm_syncobj_find(file_private, handles[i]);
1167 if (!syncobjs[i]) {
1168 ret = -ENOENT;
1169 goto err_put_syncobjs;
1170 }
1171 }
1172
1173 kfree(handles);
1174 *syncobjs_out = syncobjs;
1175 return 0;
1176
1177err_put_syncobjs:
1178 while (i-- > 0)
1179 drm_syncobj_put(syncobjs[i]);
1180 kfree(syncobjs);
1181err_free_handles:
1182 kfree(handles);
1183
1184 return ret;
1185}
1186
1187static void drm_syncobj_array_free(struct drm_syncobj **syncobjs,
1188 uint32_t count)
1189{
1190 uint32_t i;
1191
1192 for (i = 0; i < count; i++)
1193 drm_syncobj_put(syncobjs[i]);
1194 kfree(syncobjs);
1195}
1196
1197int
1198drm_syncobj_wait_ioctl(struct drm_device *dev, void *data,
1199 struct drm_file *file_private)
1200{
1201 struct drm_syncobj_wait *args = data;
1202 struct drm_syncobj **syncobjs;
1203 int ret = 0;
1204
1205 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
1206 return -EOPNOTSUPP;
1207
1208 if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL |
1209 DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT))
1210 return -EINVAL;
1211
1212 if (args->count_handles == 0)
1213 return -EINVAL;
1214
1215 ret = drm_syncobj_array_find(file_private,
1216 u64_to_user_ptr(args->handles),
1217 args->count_handles,
1218 &syncobjs);
1219 if (ret < 0)
1220 return ret;
1221
1222 ret = drm_syncobj_array_wait(dev, file_private,
1223 args, NULL, syncobjs, false);
1224
1225 drm_syncobj_array_free(syncobjs, args->count_handles);
1226
1227 return ret;
1228}
1229
1230int
1231drm_syncobj_timeline_wait_ioctl(struct drm_device *dev, void *data,
1232 struct drm_file *file_private)
1233{
1234 struct drm_syncobj_timeline_wait *args = data;
1235 struct drm_syncobj **syncobjs;
1236 int ret = 0;
1237
1238 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1239 return -EOPNOTSUPP;
1240
1241 if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL |
1242 DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
1243 DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE))
1244 return -EINVAL;
1245
1246 if (args->count_handles == 0)
1247 return -EINVAL;
1248
1249 ret = drm_syncobj_array_find(file_private,
1250 u64_to_user_ptr(args->handles),
1251 args->count_handles,
1252 &syncobjs);
1253 if (ret < 0)
1254 return ret;
1255
1256 ret = drm_syncobj_array_wait(dev, file_private,
1257 NULL, args, syncobjs, true);
1258
1259 drm_syncobj_array_free(syncobjs, args->count_handles);
1260
1261 return ret;
1262}
1263
1264
1265int
1266drm_syncobj_reset_ioctl(struct drm_device *dev, void *data,
1267 struct drm_file *file_private)
1268{
1269 struct drm_syncobj_array *args = data;
1270 struct drm_syncobj **syncobjs;
1271 uint32_t i;
1272 int ret;
1273
1274 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
1275 return -EOPNOTSUPP;
1276
1277 if (args->pad != 0)
1278 return -EINVAL;
1279
1280 if (args->count_handles == 0)
1281 return -EINVAL;
1282
1283 ret = drm_syncobj_array_find(file_private,
1284 u64_to_user_ptr(args->handles),
1285 args->count_handles,
1286 &syncobjs);
1287 if (ret < 0)
1288 return ret;
1289
1290 for (i = 0; i < args->count_handles; i++)
1291 drm_syncobj_replace_fence(syncobjs[i], NULL);
1292
1293 drm_syncobj_array_free(syncobjs, args->count_handles);
1294
1295 return 0;
1296}
1297
1298int
1299drm_syncobj_signal_ioctl(struct drm_device *dev, void *data,
1300 struct drm_file *file_private)
1301{
1302 struct drm_syncobj_array *args = data;
1303 struct drm_syncobj **syncobjs;
1304 uint32_t i;
1305 int ret;
1306
1307 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
1308 return -EOPNOTSUPP;
1309
1310 if (args->pad != 0)
1311 return -EINVAL;
1312
1313 if (args->count_handles == 0)
1314 return -EINVAL;
1315
1316 ret = drm_syncobj_array_find(file_private,
1317 u64_to_user_ptr(args->handles),
1318 args->count_handles,
1319 &syncobjs);
1320 if (ret < 0)
1321 return ret;
1322
1323 for (i = 0; i < args->count_handles; i++)
1324 drm_syncobj_assign_null_handle(syncobjs[i]);
1325
1326 drm_syncobj_array_free(syncobjs, args->count_handles);
1327
1328 return ret;
1329}
1330
1331int
1332drm_syncobj_timeline_signal_ioctl(struct drm_device *dev, void *data,
1333 struct drm_file *file_private)
1334{
1335 struct drm_syncobj_timeline_array *args = data;
1336 struct drm_syncobj **syncobjs;
1337 struct dma_fence_chain **chains;
1338 uint64_t *points;
1339 uint32_t i, j;
1340 int ret;
1341
1342 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1343 return -EOPNOTSUPP;
1344
1345 if (args->flags != 0)
1346 return -EINVAL;
1347
1348 if (args->count_handles == 0)
1349 return -EINVAL;
1350
1351 ret = drm_syncobj_array_find(file_private,
1352 u64_to_user_ptr(args->handles),
1353 args->count_handles,
1354 &syncobjs);
1355 if (ret < 0)
1356 return ret;
1357
1358 points = kmalloc_array(args->count_handles, sizeof(*points),
1359 GFP_KERNEL);
1360 if (!points) {
1361 ret = -ENOMEM;
1362 goto out;
1363 }
1364 if (!u64_to_user_ptr(args->points)) {
1365 memset(points, 0, args->count_handles * sizeof(uint64_t));
1366 } else if (copy_from_user(points, u64_to_user_ptr(args->points),
1367 sizeof(uint64_t) * args->count_handles)) {
1368 ret = -EFAULT;
1369 goto err_points;
1370 }
1371
1372 chains = kmalloc_array(args->count_handles, sizeof(void *), GFP_KERNEL);
1373 if (!chains) {
1374 ret = -ENOMEM;
1375 goto err_points;
1376 }
1377 for (i = 0; i < args->count_handles; i++) {
1378 chains[i] = kzalloc(sizeof(struct dma_fence_chain), GFP_KERNEL);
1379 if (!chains[i]) {
1380 for (j = 0; j < i; j++)
1381 kfree(chains[j]);
1382 ret = -ENOMEM;
1383 goto err_chains;
1384 }
1385 }
1386
1387 for (i = 0; i < args->count_handles; i++) {
1388 struct dma_fence *fence = dma_fence_get_stub();
1389
1390 drm_syncobj_add_point(syncobjs[i], chains[i],
1391 fence, points[i]);
1392 dma_fence_put(fence);
1393 }
1394err_chains:
1395 kfree(chains);
1396err_points:
1397 kfree(points);
1398out:
1399 drm_syncobj_array_free(syncobjs, args->count_handles);
1400
1401 return ret;
1402}
1403
1404int drm_syncobj_query_ioctl(struct drm_device *dev, void *data,
1405 struct drm_file *file_private)
1406{
1407 struct drm_syncobj_timeline_array *args = data;
1408 struct drm_syncobj **syncobjs;
1409 uint64_t __user *points = u64_to_user_ptr(args->points);
1410 uint32_t i;
1411 int ret;
1412
1413 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1414 return -EOPNOTSUPP;
1415
1416 if (args->flags & ~DRM_SYNCOBJ_QUERY_FLAGS_LAST_SUBMITTED)
1417 return -EINVAL;
1418
1419 if (args->count_handles == 0)
1420 return -EINVAL;
1421
1422 ret = drm_syncobj_array_find(file_private,
1423 u64_to_user_ptr(args->handles),
1424 args->count_handles,
1425 &syncobjs);
1426 if (ret < 0)
1427 return ret;
1428
1429 for (i = 0; i < args->count_handles; i++) {
1430 struct dma_fence_chain *chain;
1431 struct dma_fence *fence;
1432 uint64_t point;
1433
1434 fence = drm_syncobj_fence_get(syncobjs[i]);
1435 chain = to_dma_fence_chain(fence);
1436 if (chain) {
1437 struct dma_fence *iter, *last_signaled =
1438 dma_fence_get(fence);
1439
1440 if (args->flags &
1441 DRM_SYNCOBJ_QUERY_FLAGS_LAST_SUBMITTED) {
1442 point = fence->seqno;
1443 } else {
1444 dma_fence_chain_for_each(iter, fence) {
1445 if (iter->context != fence->context) {
1446 dma_fence_put(iter);
1447 /* It is most likely that timeline has
1448 * unorder points. */
1449 break;
1450 }
1451 dma_fence_put(last_signaled);
1452 last_signaled = dma_fence_get(iter);
1453 }
1454 point = dma_fence_is_signaled(last_signaled) ?
1455 last_signaled->seqno :
1456 to_dma_fence_chain(last_signaled)->prev_seqno;
1457 }
1458 dma_fence_put(last_signaled);
1459 } else {
1460 point = 0;
1461 }
1462 dma_fence_put(fence);
1463 ret = copy_to_user(&points[i], &point, sizeof(uint64_t));
1464 ret = ret ? -EFAULT : 0;
1465 if (ret)
1466 break;
1467 }
1468 drm_syncobj_array_free(syncobjs, args->count_handles);
1469
1470 return ret;
1471}
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}