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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 * If &DRM_SYNCOBJ_WAIT_FLAGS_WAIT_DEADLINE is set, the ioctl will also set
130 * a fence deadline hint on the backing fences before waiting, to provide the
131 * fence signaler with an appropriate sense of urgency. The deadline is
132 * specified as an absolute &CLOCK_MONOTONIC value in units of ns.
133 *
134 * Similarly, &DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT takes an array of syncobj
135 * handles as well as an array of u64 points and does a host-side wait on all
136 * of syncobj fences at the given points simultaneously.
137 *
138 * &DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT also adds the ability to wait for a given
139 * fence to materialize on the timeline without waiting for the fence to be
140 * signaled by using the &DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE flag. This
141 * requirement is inherited from the wait-before-signal behavior required by
142 * the Vulkan timeline semaphore API.
143 *
144 * Alternatively, &DRM_IOCTL_SYNCOBJ_EVENTFD can be used to wait without
145 * blocking: an eventfd will be signaled when the syncobj is. This is useful to
146 * integrate the wait in an event loop.
147 *
148 *
149 * Import/export of syncobjs
150 * -------------------------
151 *
152 * &DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE and &DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD
153 * provide two mechanisms for import/export of syncobjs.
154 *
155 * The first lets the client import or export an entire syncobj to a file
156 * descriptor.
157 * These fd's are opaque and have no other use case, except passing the
158 * syncobj between processes.
159 * All exported file descriptors and any syncobj handles created as a
160 * result of importing those file descriptors own a reference to the
161 * same underlying struct &drm_syncobj and the syncobj can be used
162 * persistently across all the processes with which it is shared.
163 * The syncobj is freed only once the last reference is dropped.
164 * Unlike dma-buf, importing a syncobj creates a new handle (with its own
165 * reference) for every import instead of de-duplicating.
166 * The primary use-case of this persistent import/export is for shared
167 * Vulkan fences and semaphores.
168 *
169 * The second import/export mechanism, which is indicated by
170 * &DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE or
171 * &DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE lets the client
172 * import/export the syncobj's current fence from/to a &sync_file.
173 * When a syncobj is exported to a sync file, that sync file wraps the
174 * sycnobj's fence at the time of export and any later signal or reset
175 * operations on the syncobj will not affect the exported sync file.
176 * When a sync file is imported into a syncobj, the syncobj's fence is set
177 * to the fence wrapped by that sync file.
178 * Because sync files are immutable, resetting or signaling the syncobj
179 * will not affect any sync files whose fences have been imported into the
180 * syncobj.
181 *
182 *
183 * Import/export of timeline points in timeline syncobjs
184 * -----------------------------------------------------
185 *
186 * &DRM_IOCTL_SYNCOBJ_TRANSFER provides a mechanism to transfer a struct
187 * &dma_fence_chain of a syncobj at a given u64 point to another u64 point
188 * into another syncobj.
189 *
190 * Note that if you want to transfer a struct &dma_fence_chain from a given
191 * point on a timeline syncobj from/into a binary syncobj, you can use the
192 * point 0 to mean take/replace the fence in the syncobj.
193 */
194
195#include <linux/anon_inodes.h>
196#include <linux/dma-fence-unwrap.h>
197#include <linux/eventfd.h>
198#include <linux/file.h>
199#include <linux/fs.h>
200#include <linux/sched/signal.h>
201#include <linux/sync_file.h>
202#include <linux/uaccess.h>
203
204#include <drm/drm.h>
205#include <drm/drm_drv.h>
206#include <drm/drm_file.h>
207#include <drm/drm_gem.h>
208#include <drm/drm_print.h>
209#include <drm/drm_syncobj.h>
210#include <drm/drm_utils.h>
211
212#include "drm_internal.h"
213
214struct syncobj_wait_entry {
215 struct list_head node;
216 struct task_struct *task;
217 struct dma_fence *fence;
218 struct dma_fence_cb fence_cb;
219 u64 point;
220};
221
222static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
223 struct syncobj_wait_entry *wait);
224
225struct syncobj_eventfd_entry {
226 struct list_head node;
227 struct dma_fence *fence;
228 struct dma_fence_cb fence_cb;
229 struct drm_syncobj *syncobj;
230 struct eventfd_ctx *ev_fd_ctx;
231 u64 point;
232 u32 flags;
233};
234
235static void
236syncobj_eventfd_entry_func(struct drm_syncobj *syncobj,
237 struct syncobj_eventfd_entry *entry);
238
239/**
240 * drm_syncobj_find - lookup and reference a sync object.
241 * @file_private: drm file private pointer
242 * @handle: sync object handle to lookup.
243 *
244 * Returns a reference to the syncobj pointed to by handle or NULL. The
245 * reference must be released by calling drm_syncobj_put().
246 */
247struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
248 u32 handle)
249{
250 struct drm_syncobj *syncobj;
251
252 spin_lock(&file_private->syncobj_table_lock);
253
254 /* Check if we currently have a reference on the object */
255 syncobj = idr_find(&file_private->syncobj_idr, handle);
256 if (syncobj)
257 drm_syncobj_get(syncobj);
258
259 spin_unlock(&file_private->syncobj_table_lock);
260
261 return syncobj;
262}
263EXPORT_SYMBOL(drm_syncobj_find);
264
265static void drm_syncobj_fence_add_wait(struct drm_syncobj *syncobj,
266 struct syncobj_wait_entry *wait)
267{
268 struct dma_fence *fence;
269
270 if (wait->fence)
271 return;
272
273 spin_lock(&syncobj->lock);
274 /* We've already tried once to get a fence and failed. Now that we
275 * have the lock, try one more time just to be sure we don't add a
276 * callback when a fence has already been set.
277 */
278 fence = dma_fence_get(rcu_dereference_protected(syncobj->fence, 1));
279 if (!fence || dma_fence_chain_find_seqno(&fence, wait->point)) {
280 dma_fence_put(fence);
281 list_add_tail(&wait->node, &syncobj->cb_list);
282 } else if (!fence) {
283 wait->fence = dma_fence_get_stub();
284 } else {
285 wait->fence = fence;
286 }
287 spin_unlock(&syncobj->lock);
288}
289
290static void drm_syncobj_remove_wait(struct drm_syncobj *syncobj,
291 struct syncobj_wait_entry *wait)
292{
293 if (!wait->node.next)
294 return;
295
296 spin_lock(&syncobj->lock);
297 list_del_init(&wait->node);
298 spin_unlock(&syncobj->lock);
299}
300
301static void
302syncobj_eventfd_entry_free(struct syncobj_eventfd_entry *entry)
303{
304 eventfd_ctx_put(entry->ev_fd_ctx);
305 dma_fence_put(entry->fence);
306 /* This happens either inside the syncobj lock, or after the node has
307 * already been removed from the list.
308 */
309 list_del(&entry->node);
310 kfree(entry);
311}
312
313static void
314drm_syncobj_add_eventfd(struct drm_syncobj *syncobj,
315 struct syncobj_eventfd_entry *entry)
316{
317 spin_lock(&syncobj->lock);
318 list_add_tail(&entry->node, &syncobj->ev_fd_list);
319 syncobj_eventfd_entry_func(syncobj, entry);
320 spin_unlock(&syncobj->lock);
321}
322
323/**
324 * drm_syncobj_add_point - add new timeline point to the syncobj
325 * @syncobj: sync object to add timeline point do
326 * @chain: chain node to use to add the point
327 * @fence: fence to encapsulate in the chain node
328 * @point: sequence number to use for the point
329 *
330 * Add the chain node as new timeline point to the syncobj.
331 */
332void drm_syncobj_add_point(struct drm_syncobj *syncobj,
333 struct dma_fence_chain *chain,
334 struct dma_fence *fence,
335 uint64_t point)
336{
337 struct syncobj_wait_entry *wait_cur, *wait_tmp;
338 struct syncobj_eventfd_entry *ev_fd_cur, *ev_fd_tmp;
339 struct dma_fence *prev;
340
341 dma_fence_get(fence);
342
343 spin_lock(&syncobj->lock);
344
345 prev = drm_syncobj_fence_get(syncobj);
346 /* You are adding an unorder point to timeline, which could cause payload returned from query_ioctl is 0! */
347 if (prev && prev->seqno >= point)
348 DRM_DEBUG("You are adding an unorder point to timeline!\n");
349 dma_fence_chain_init(chain, prev, fence, point);
350 rcu_assign_pointer(syncobj->fence, &chain->base);
351
352 list_for_each_entry_safe(wait_cur, wait_tmp, &syncobj->cb_list, node)
353 syncobj_wait_syncobj_func(syncobj, wait_cur);
354 list_for_each_entry_safe(ev_fd_cur, ev_fd_tmp, &syncobj->ev_fd_list, node)
355 syncobj_eventfd_entry_func(syncobj, ev_fd_cur);
356 spin_unlock(&syncobj->lock);
357
358 /* Walk the chain once to trigger garbage collection */
359 dma_fence_chain_for_each(fence, prev);
360 dma_fence_put(prev);
361}
362EXPORT_SYMBOL(drm_syncobj_add_point);
363
364/**
365 * drm_syncobj_replace_fence - replace fence in a sync object.
366 * @syncobj: Sync object to replace fence in
367 * @fence: fence to install in sync file.
368 *
369 * This replaces the fence on a sync object.
370 */
371void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
372 struct dma_fence *fence)
373{
374 struct dma_fence *old_fence;
375 struct syncobj_wait_entry *wait_cur, *wait_tmp;
376 struct syncobj_eventfd_entry *ev_fd_cur, *ev_fd_tmp;
377
378 if (fence)
379 dma_fence_get(fence);
380
381 spin_lock(&syncobj->lock);
382
383 old_fence = rcu_dereference_protected(syncobj->fence,
384 lockdep_is_held(&syncobj->lock));
385 rcu_assign_pointer(syncobj->fence, fence);
386
387 if (fence != old_fence) {
388 list_for_each_entry_safe(wait_cur, wait_tmp, &syncobj->cb_list, node)
389 syncobj_wait_syncobj_func(syncobj, wait_cur);
390 list_for_each_entry_safe(ev_fd_cur, ev_fd_tmp, &syncobj->ev_fd_list, node)
391 syncobj_eventfd_entry_func(syncobj, ev_fd_cur);
392 }
393
394 spin_unlock(&syncobj->lock);
395
396 dma_fence_put(old_fence);
397}
398EXPORT_SYMBOL(drm_syncobj_replace_fence);
399
400/**
401 * drm_syncobj_assign_null_handle - assign a stub fence to the sync object
402 * @syncobj: sync object to assign the fence on
403 *
404 * Assign a already signaled stub fence to the sync object.
405 */
406static int drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj)
407{
408 struct dma_fence *fence = dma_fence_allocate_private_stub(ktime_get());
409
410 if (!fence)
411 return -ENOMEM;
412
413 drm_syncobj_replace_fence(syncobj, fence);
414 dma_fence_put(fence);
415 return 0;
416}
417
418/* 5s default for wait submission */
419#define DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT 5000000000ULL
420/**
421 * drm_syncobj_find_fence - lookup and reference the fence in a sync object
422 * @file_private: drm file private pointer
423 * @handle: sync object handle to lookup.
424 * @point: timeline point
425 * @flags: DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT or not
426 * @fence: out parameter for the fence
427 *
428 * This is just a convenience function that combines drm_syncobj_find() and
429 * drm_syncobj_fence_get().
430 *
431 * Returns 0 on success or a negative error value on failure. On success @fence
432 * contains a reference to the fence, which must be released by calling
433 * dma_fence_put().
434 */
435int drm_syncobj_find_fence(struct drm_file *file_private,
436 u32 handle, u64 point, u64 flags,
437 struct dma_fence **fence)
438{
439 struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
440 struct syncobj_wait_entry wait;
441 u64 timeout = nsecs_to_jiffies64(DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT);
442 int ret;
443
444 if (!syncobj)
445 return -ENOENT;
446
447 /* Waiting for userspace with locks help is illegal cause that can
448 * trivial deadlock with page faults for example. Make lockdep complain
449 * about it early on.
450 */
451 if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
452 might_sleep();
453 lockdep_assert_none_held_once();
454 }
455
456 *fence = drm_syncobj_fence_get(syncobj);
457
458 if (*fence) {
459 ret = dma_fence_chain_find_seqno(fence, point);
460 if (!ret) {
461 /* If the requested seqno is already signaled
462 * drm_syncobj_find_fence may return a NULL
463 * fence. To make sure the recipient gets
464 * signalled, use a new fence instead.
465 */
466 if (!*fence)
467 *fence = dma_fence_get_stub();
468
469 goto out;
470 }
471 dma_fence_put(*fence);
472 } else {
473 ret = -EINVAL;
474 }
475
476 if (!(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT))
477 goto out;
478
479 memset(&wait, 0, sizeof(wait));
480 wait.task = current;
481 wait.point = point;
482 drm_syncobj_fence_add_wait(syncobj, &wait);
483
484 do {
485 set_current_state(TASK_INTERRUPTIBLE);
486 if (wait.fence) {
487 ret = 0;
488 break;
489 }
490 if (timeout == 0) {
491 ret = -ETIME;
492 break;
493 }
494
495 if (signal_pending(current)) {
496 ret = -ERESTARTSYS;
497 break;
498 }
499
500 timeout = schedule_timeout(timeout);
501 } while (1);
502
503 __set_current_state(TASK_RUNNING);
504 *fence = wait.fence;
505
506 if (wait.node.next)
507 drm_syncobj_remove_wait(syncobj, &wait);
508
509out:
510 drm_syncobj_put(syncobj);
511
512 return ret;
513}
514EXPORT_SYMBOL(drm_syncobj_find_fence);
515
516/**
517 * drm_syncobj_free - free a sync object.
518 * @kref: kref to free.
519 *
520 * Only to be called from kref_put in drm_syncobj_put.
521 */
522void drm_syncobj_free(struct kref *kref)
523{
524 struct drm_syncobj *syncobj = container_of(kref,
525 struct drm_syncobj,
526 refcount);
527 struct syncobj_eventfd_entry *ev_fd_cur, *ev_fd_tmp;
528
529 drm_syncobj_replace_fence(syncobj, NULL);
530
531 list_for_each_entry_safe(ev_fd_cur, ev_fd_tmp, &syncobj->ev_fd_list, node)
532 syncobj_eventfd_entry_free(ev_fd_cur);
533
534 kfree(syncobj);
535}
536EXPORT_SYMBOL(drm_syncobj_free);
537
538/**
539 * drm_syncobj_create - create a new syncobj
540 * @out_syncobj: returned syncobj
541 * @flags: DRM_SYNCOBJ_* flags
542 * @fence: if non-NULL, the syncobj will represent this fence
543 *
544 * This is the first function to create a sync object. After creating, drivers
545 * probably want to make it available to userspace, either through
546 * drm_syncobj_get_handle() or drm_syncobj_get_fd().
547 *
548 * Returns 0 on success or a negative error value on failure.
549 */
550int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
551 struct dma_fence *fence)
552{
553 int ret;
554 struct drm_syncobj *syncobj;
555
556 syncobj = kzalloc(sizeof(struct drm_syncobj), GFP_KERNEL);
557 if (!syncobj)
558 return -ENOMEM;
559
560 kref_init(&syncobj->refcount);
561 INIT_LIST_HEAD(&syncobj->cb_list);
562 INIT_LIST_HEAD(&syncobj->ev_fd_list);
563 spin_lock_init(&syncobj->lock);
564
565 if (flags & DRM_SYNCOBJ_CREATE_SIGNALED) {
566 ret = drm_syncobj_assign_null_handle(syncobj);
567 if (ret < 0) {
568 drm_syncobj_put(syncobj);
569 return ret;
570 }
571 }
572
573 if (fence)
574 drm_syncobj_replace_fence(syncobj, fence);
575
576 *out_syncobj = syncobj;
577 return 0;
578}
579EXPORT_SYMBOL(drm_syncobj_create);
580
581/**
582 * drm_syncobj_get_handle - get a handle from a syncobj
583 * @file_private: drm file private pointer
584 * @syncobj: Sync object to export
585 * @handle: out parameter with the new handle
586 *
587 * Exports a sync object created with drm_syncobj_create() as a handle on
588 * @file_private to userspace.
589 *
590 * Returns 0 on success or a negative error value on failure.
591 */
592int drm_syncobj_get_handle(struct drm_file *file_private,
593 struct drm_syncobj *syncobj, u32 *handle)
594{
595 int ret;
596
597 /* take a reference to put in the idr */
598 drm_syncobj_get(syncobj);
599
600 idr_preload(GFP_KERNEL);
601 spin_lock(&file_private->syncobj_table_lock);
602 ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
603 spin_unlock(&file_private->syncobj_table_lock);
604
605 idr_preload_end();
606
607 if (ret < 0) {
608 drm_syncobj_put(syncobj);
609 return ret;
610 }
611
612 *handle = ret;
613 return 0;
614}
615EXPORT_SYMBOL(drm_syncobj_get_handle);
616
617static int drm_syncobj_create_as_handle(struct drm_file *file_private,
618 u32 *handle, uint32_t flags)
619{
620 int ret;
621 struct drm_syncobj *syncobj;
622
623 ret = drm_syncobj_create(&syncobj, flags, NULL);
624 if (ret)
625 return ret;
626
627 ret = drm_syncobj_get_handle(file_private, syncobj, handle);
628 drm_syncobj_put(syncobj);
629 return ret;
630}
631
632static int drm_syncobj_destroy(struct drm_file *file_private,
633 u32 handle)
634{
635 struct drm_syncobj *syncobj;
636
637 spin_lock(&file_private->syncobj_table_lock);
638 syncobj = idr_remove(&file_private->syncobj_idr, handle);
639 spin_unlock(&file_private->syncobj_table_lock);
640
641 if (!syncobj)
642 return -EINVAL;
643
644 drm_syncobj_put(syncobj);
645 return 0;
646}
647
648static int drm_syncobj_file_release(struct inode *inode, struct file *file)
649{
650 struct drm_syncobj *syncobj = file->private_data;
651
652 drm_syncobj_put(syncobj);
653 return 0;
654}
655
656static const struct file_operations drm_syncobj_file_fops = {
657 .release = drm_syncobj_file_release,
658};
659
660/**
661 * drm_syncobj_get_fd - get a file descriptor from a syncobj
662 * @syncobj: Sync object to export
663 * @p_fd: out parameter with the new file descriptor
664 *
665 * Exports a sync object created with drm_syncobj_create() as a file descriptor.
666 *
667 * Returns 0 on success or a negative error value on failure.
668 */
669int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd)
670{
671 struct file *file;
672 int fd;
673
674 fd = get_unused_fd_flags(O_CLOEXEC);
675 if (fd < 0)
676 return fd;
677
678 file = anon_inode_getfile("syncobj_file",
679 &drm_syncobj_file_fops,
680 syncobj, 0);
681 if (IS_ERR(file)) {
682 put_unused_fd(fd);
683 return PTR_ERR(file);
684 }
685
686 drm_syncobj_get(syncobj);
687 fd_install(fd, file);
688
689 *p_fd = fd;
690 return 0;
691}
692EXPORT_SYMBOL(drm_syncobj_get_fd);
693
694static int drm_syncobj_handle_to_fd(struct drm_file *file_private,
695 u32 handle, int *p_fd)
696{
697 struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
698 int ret;
699
700 if (!syncobj)
701 return -EINVAL;
702
703 ret = drm_syncobj_get_fd(syncobj, p_fd);
704 drm_syncobj_put(syncobj);
705 return ret;
706}
707
708static int drm_syncobj_fd_to_handle(struct drm_file *file_private,
709 int fd, u32 *handle)
710{
711 struct drm_syncobj *syncobj;
712 struct fd f = fdget(fd);
713 int ret;
714
715 if (!f.file)
716 return -EINVAL;
717
718 if (f.file->f_op != &drm_syncobj_file_fops) {
719 fdput(f);
720 return -EINVAL;
721 }
722
723 /* take a reference to put in the idr */
724 syncobj = f.file->private_data;
725 drm_syncobj_get(syncobj);
726
727 idr_preload(GFP_KERNEL);
728 spin_lock(&file_private->syncobj_table_lock);
729 ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
730 spin_unlock(&file_private->syncobj_table_lock);
731 idr_preload_end();
732
733 if (ret > 0) {
734 *handle = ret;
735 ret = 0;
736 } else
737 drm_syncobj_put(syncobj);
738
739 fdput(f);
740 return ret;
741}
742
743static int drm_syncobj_import_sync_file_fence(struct drm_file *file_private,
744 int fd, int handle)
745{
746 struct dma_fence *fence = sync_file_get_fence(fd);
747 struct drm_syncobj *syncobj;
748
749 if (!fence)
750 return -EINVAL;
751
752 syncobj = drm_syncobj_find(file_private, handle);
753 if (!syncobj) {
754 dma_fence_put(fence);
755 return -ENOENT;
756 }
757
758 drm_syncobj_replace_fence(syncobj, fence);
759 dma_fence_put(fence);
760 drm_syncobj_put(syncobj);
761 return 0;
762}
763
764static int drm_syncobj_export_sync_file(struct drm_file *file_private,
765 int handle, int *p_fd)
766{
767 int ret;
768 struct dma_fence *fence;
769 struct sync_file *sync_file;
770 int fd = get_unused_fd_flags(O_CLOEXEC);
771
772 if (fd < 0)
773 return fd;
774
775 ret = drm_syncobj_find_fence(file_private, handle, 0, 0, &fence);
776 if (ret)
777 goto err_put_fd;
778
779 sync_file = sync_file_create(fence);
780
781 dma_fence_put(fence);
782
783 if (!sync_file) {
784 ret = -EINVAL;
785 goto err_put_fd;
786 }
787
788 fd_install(fd, sync_file->file);
789
790 *p_fd = fd;
791 return 0;
792err_put_fd:
793 put_unused_fd(fd);
794 return ret;
795}
796/**
797 * drm_syncobj_open - initializes syncobj file-private structures at devnode open time
798 * @file_private: drm file-private structure to set up
799 *
800 * Called at device open time, sets up the structure for handling refcounting
801 * of sync objects.
802 */
803void
804drm_syncobj_open(struct drm_file *file_private)
805{
806 idr_init_base(&file_private->syncobj_idr, 1);
807 spin_lock_init(&file_private->syncobj_table_lock);
808}
809
810static int
811drm_syncobj_release_handle(int id, void *ptr, void *data)
812{
813 struct drm_syncobj *syncobj = ptr;
814
815 drm_syncobj_put(syncobj);
816 return 0;
817}
818
819/**
820 * drm_syncobj_release - release file-private sync object resources
821 * @file_private: drm file-private structure to clean up
822 *
823 * Called at close time when the filp is going away.
824 *
825 * Releases any remaining references on objects by this filp.
826 */
827void
828drm_syncobj_release(struct drm_file *file_private)
829{
830 idr_for_each(&file_private->syncobj_idr,
831 &drm_syncobj_release_handle, file_private);
832 idr_destroy(&file_private->syncobj_idr);
833}
834
835int
836drm_syncobj_create_ioctl(struct drm_device *dev, void *data,
837 struct drm_file *file_private)
838{
839 struct drm_syncobj_create *args = data;
840
841 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
842 return -EOPNOTSUPP;
843
844 /* no valid flags yet */
845 if (args->flags & ~DRM_SYNCOBJ_CREATE_SIGNALED)
846 return -EINVAL;
847
848 return drm_syncobj_create_as_handle(file_private,
849 &args->handle, args->flags);
850}
851
852int
853drm_syncobj_destroy_ioctl(struct drm_device *dev, void *data,
854 struct drm_file *file_private)
855{
856 struct drm_syncobj_destroy *args = data;
857
858 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
859 return -EOPNOTSUPP;
860
861 /* make sure padding is empty */
862 if (args->pad)
863 return -EINVAL;
864 return drm_syncobj_destroy(file_private, args->handle);
865}
866
867int
868drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data,
869 struct drm_file *file_private)
870{
871 struct drm_syncobj_handle *args = data;
872
873 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
874 return -EOPNOTSUPP;
875
876 if (args->pad)
877 return -EINVAL;
878
879 if (args->flags != 0 &&
880 args->flags != DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
881 return -EINVAL;
882
883 if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
884 return drm_syncobj_export_sync_file(file_private, args->handle,
885 &args->fd);
886
887 return drm_syncobj_handle_to_fd(file_private, args->handle,
888 &args->fd);
889}
890
891int
892drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
893 struct drm_file *file_private)
894{
895 struct drm_syncobj_handle *args = data;
896
897 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
898 return -EOPNOTSUPP;
899
900 if (args->pad)
901 return -EINVAL;
902
903 if (args->flags != 0 &&
904 args->flags != DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE)
905 return -EINVAL;
906
907 if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE)
908 return drm_syncobj_import_sync_file_fence(file_private,
909 args->fd,
910 args->handle);
911
912 return drm_syncobj_fd_to_handle(file_private, args->fd,
913 &args->handle);
914}
915
916static int drm_syncobj_transfer_to_timeline(struct drm_file *file_private,
917 struct drm_syncobj_transfer *args)
918{
919 struct drm_syncobj *timeline_syncobj = NULL;
920 struct dma_fence *fence, *tmp;
921 struct dma_fence_chain *chain;
922 int ret;
923
924 timeline_syncobj = drm_syncobj_find(file_private, args->dst_handle);
925 if (!timeline_syncobj) {
926 return -ENOENT;
927 }
928 ret = drm_syncobj_find_fence(file_private, args->src_handle,
929 args->src_point, args->flags,
930 &tmp);
931 if (ret)
932 goto err_put_timeline;
933
934 fence = dma_fence_unwrap_merge(tmp);
935 dma_fence_put(tmp);
936 if (!fence) {
937 ret = -ENOMEM;
938 goto err_put_timeline;
939 }
940
941 chain = dma_fence_chain_alloc();
942 if (!chain) {
943 ret = -ENOMEM;
944 goto err_free_fence;
945 }
946
947 drm_syncobj_add_point(timeline_syncobj, chain, fence, args->dst_point);
948err_free_fence:
949 dma_fence_put(fence);
950err_put_timeline:
951 drm_syncobj_put(timeline_syncobj);
952
953 return ret;
954}
955
956static int
957drm_syncobj_transfer_to_binary(struct drm_file *file_private,
958 struct drm_syncobj_transfer *args)
959{
960 struct drm_syncobj *binary_syncobj = NULL;
961 struct dma_fence *fence;
962 int ret;
963
964 binary_syncobj = drm_syncobj_find(file_private, args->dst_handle);
965 if (!binary_syncobj)
966 return -ENOENT;
967 ret = drm_syncobj_find_fence(file_private, args->src_handle,
968 args->src_point, args->flags, &fence);
969 if (ret)
970 goto err;
971 drm_syncobj_replace_fence(binary_syncobj, fence);
972 dma_fence_put(fence);
973err:
974 drm_syncobj_put(binary_syncobj);
975
976 return ret;
977}
978int
979drm_syncobj_transfer_ioctl(struct drm_device *dev, void *data,
980 struct drm_file *file_private)
981{
982 struct drm_syncobj_transfer *args = data;
983 int ret;
984
985 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
986 return -EOPNOTSUPP;
987
988 if (args->pad)
989 return -EINVAL;
990
991 if (args->dst_point)
992 ret = drm_syncobj_transfer_to_timeline(file_private, args);
993 else
994 ret = drm_syncobj_transfer_to_binary(file_private, args);
995
996 return ret;
997}
998
999static void syncobj_wait_fence_func(struct dma_fence *fence,
1000 struct dma_fence_cb *cb)
1001{
1002 struct syncobj_wait_entry *wait =
1003 container_of(cb, struct syncobj_wait_entry, fence_cb);
1004
1005 wake_up_process(wait->task);
1006}
1007
1008static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
1009 struct syncobj_wait_entry *wait)
1010{
1011 struct dma_fence *fence;
1012
1013 /* This happens inside the syncobj lock */
1014 fence = rcu_dereference_protected(syncobj->fence,
1015 lockdep_is_held(&syncobj->lock));
1016 dma_fence_get(fence);
1017 if (!fence || dma_fence_chain_find_seqno(&fence, wait->point)) {
1018 dma_fence_put(fence);
1019 return;
1020 } else if (!fence) {
1021 wait->fence = dma_fence_get_stub();
1022 } else {
1023 wait->fence = fence;
1024 }
1025
1026 wake_up_process(wait->task);
1027 list_del_init(&wait->node);
1028}
1029
1030static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
1031 void __user *user_points,
1032 uint32_t count,
1033 uint32_t flags,
1034 signed long timeout,
1035 uint32_t *idx,
1036 ktime_t *deadline)
1037{
1038 struct syncobj_wait_entry *entries;
1039 struct dma_fence *fence;
1040 uint64_t *points;
1041 uint32_t signaled_count, i;
1042
1043 if (flags & (DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
1044 DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE))
1045 lockdep_assert_none_held_once();
1046
1047 points = kmalloc_array(count, sizeof(*points), GFP_KERNEL);
1048 if (points == NULL)
1049 return -ENOMEM;
1050
1051 if (!user_points) {
1052 memset(points, 0, count * sizeof(uint64_t));
1053
1054 } else if (copy_from_user(points, user_points,
1055 sizeof(uint64_t) * count)) {
1056 timeout = -EFAULT;
1057 goto err_free_points;
1058 }
1059
1060 entries = kcalloc(count, sizeof(*entries), GFP_KERNEL);
1061 if (!entries) {
1062 timeout = -ENOMEM;
1063 goto err_free_points;
1064 }
1065 /* Walk the list of sync objects and initialize entries. We do
1066 * this up-front so that we can properly return -EINVAL if there is
1067 * a syncobj with a missing fence and then never have the chance of
1068 * returning -EINVAL again.
1069 */
1070 signaled_count = 0;
1071 for (i = 0; i < count; ++i) {
1072 struct dma_fence *fence;
1073
1074 entries[i].task = current;
1075 entries[i].point = points[i];
1076 fence = drm_syncobj_fence_get(syncobjs[i]);
1077 if (!fence || dma_fence_chain_find_seqno(&fence, points[i])) {
1078 dma_fence_put(fence);
1079 if (flags & (DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
1080 DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE)) {
1081 continue;
1082 } else {
1083 timeout = -EINVAL;
1084 goto cleanup_entries;
1085 }
1086 }
1087
1088 if (fence)
1089 entries[i].fence = fence;
1090 else
1091 entries[i].fence = dma_fence_get_stub();
1092
1093 if ((flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) ||
1094 dma_fence_is_signaled(entries[i].fence)) {
1095 if (signaled_count == 0 && idx)
1096 *idx = i;
1097 signaled_count++;
1098 }
1099 }
1100
1101 if (signaled_count == count ||
1102 (signaled_count > 0 &&
1103 !(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL)))
1104 goto cleanup_entries;
1105
1106 /* There's a very annoying laxness in the dma_fence API here, in
1107 * that backends are not required to automatically report when a
1108 * fence is signaled prior to fence->ops->enable_signaling() being
1109 * called. So here if we fail to match signaled_count, we need to
1110 * fallthough and try a 0 timeout wait!
1111 */
1112
1113 if (flags & (DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
1114 DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE)) {
1115 for (i = 0; i < count; ++i)
1116 drm_syncobj_fence_add_wait(syncobjs[i], &entries[i]);
1117 }
1118
1119 if (deadline) {
1120 for (i = 0; i < count; ++i) {
1121 fence = entries[i].fence;
1122 if (!fence)
1123 continue;
1124 dma_fence_set_deadline(fence, *deadline);
1125 }
1126 }
1127
1128 do {
1129 set_current_state(TASK_INTERRUPTIBLE);
1130
1131 signaled_count = 0;
1132 for (i = 0; i < count; ++i) {
1133 fence = entries[i].fence;
1134 if (!fence)
1135 continue;
1136
1137 if ((flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) ||
1138 dma_fence_is_signaled(fence) ||
1139 (!entries[i].fence_cb.func &&
1140 dma_fence_add_callback(fence,
1141 &entries[i].fence_cb,
1142 syncobj_wait_fence_func))) {
1143 /* The fence has been signaled */
1144 if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL) {
1145 signaled_count++;
1146 } else {
1147 if (idx)
1148 *idx = i;
1149 goto done_waiting;
1150 }
1151 }
1152 }
1153
1154 if (signaled_count == count)
1155 goto done_waiting;
1156
1157 if (timeout == 0) {
1158 timeout = -ETIME;
1159 goto done_waiting;
1160 }
1161
1162 if (signal_pending(current)) {
1163 timeout = -ERESTARTSYS;
1164 goto done_waiting;
1165 }
1166
1167 timeout = schedule_timeout(timeout);
1168 } while (1);
1169
1170done_waiting:
1171 __set_current_state(TASK_RUNNING);
1172
1173cleanup_entries:
1174 for (i = 0; i < count; ++i) {
1175 drm_syncobj_remove_wait(syncobjs[i], &entries[i]);
1176 if (entries[i].fence_cb.func)
1177 dma_fence_remove_callback(entries[i].fence,
1178 &entries[i].fence_cb);
1179 dma_fence_put(entries[i].fence);
1180 }
1181 kfree(entries);
1182
1183err_free_points:
1184 kfree(points);
1185
1186 return timeout;
1187}
1188
1189/**
1190 * drm_timeout_abs_to_jiffies - calculate jiffies timeout from absolute value
1191 *
1192 * @timeout_nsec: timeout nsec component in ns, 0 for poll
1193 *
1194 * Calculate the timeout in jiffies from an absolute time in sec/nsec.
1195 */
1196signed long drm_timeout_abs_to_jiffies(int64_t timeout_nsec)
1197{
1198 ktime_t abs_timeout, now;
1199 u64 timeout_ns, timeout_jiffies64;
1200
1201 /* make 0 timeout means poll - absolute 0 doesn't seem valid */
1202 if (timeout_nsec == 0)
1203 return 0;
1204
1205 abs_timeout = ns_to_ktime(timeout_nsec);
1206 now = ktime_get();
1207
1208 if (!ktime_after(abs_timeout, now))
1209 return 0;
1210
1211 timeout_ns = ktime_to_ns(ktime_sub(abs_timeout, now));
1212
1213 timeout_jiffies64 = nsecs_to_jiffies64(timeout_ns);
1214 /* clamp timeout to avoid infinite timeout */
1215 if (timeout_jiffies64 >= MAX_SCHEDULE_TIMEOUT - 1)
1216 return MAX_SCHEDULE_TIMEOUT - 1;
1217
1218 return timeout_jiffies64 + 1;
1219}
1220EXPORT_SYMBOL(drm_timeout_abs_to_jiffies);
1221
1222static int drm_syncobj_array_wait(struct drm_device *dev,
1223 struct drm_file *file_private,
1224 struct drm_syncobj_wait *wait,
1225 struct drm_syncobj_timeline_wait *timeline_wait,
1226 struct drm_syncobj **syncobjs, bool timeline,
1227 ktime_t *deadline)
1228{
1229 signed long timeout = 0;
1230 uint32_t first = ~0;
1231
1232 if (!timeline) {
1233 timeout = drm_timeout_abs_to_jiffies(wait->timeout_nsec);
1234 timeout = drm_syncobj_array_wait_timeout(syncobjs,
1235 NULL,
1236 wait->count_handles,
1237 wait->flags,
1238 timeout, &first,
1239 deadline);
1240 if (timeout < 0)
1241 return timeout;
1242 wait->first_signaled = first;
1243 } else {
1244 timeout = drm_timeout_abs_to_jiffies(timeline_wait->timeout_nsec);
1245 timeout = drm_syncobj_array_wait_timeout(syncobjs,
1246 u64_to_user_ptr(timeline_wait->points),
1247 timeline_wait->count_handles,
1248 timeline_wait->flags,
1249 timeout, &first,
1250 deadline);
1251 if (timeout < 0)
1252 return timeout;
1253 timeline_wait->first_signaled = first;
1254 }
1255 return 0;
1256}
1257
1258static int drm_syncobj_array_find(struct drm_file *file_private,
1259 void __user *user_handles,
1260 uint32_t count_handles,
1261 struct drm_syncobj ***syncobjs_out)
1262{
1263 uint32_t i, *handles;
1264 struct drm_syncobj **syncobjs;
1265 int ret;
1266
1267 handles = kmalloc_array(count_handles, sizeof(*handles), GFP_KERNEL);
1268 if (handles == NULL)
1269 return -ENOMEM;
1270
1271 if (copy_from_user(handles, user_handles,
1272 sizeof(uint32_t) * count_handles)) {
1273 ret = -EFAULT;
1274 goto err_free_handles;
1275 }
1276
1277 syncobjs = kmalloc_array(count_handles, sizeof(*syncobjs), GFP_KERNEL);
1278 if (syncobjs == NULL) {
1279 ret = -ENOMEM;
1280 goto err_free_handles;
1281 }
1282
1283 for (i = 0; i < count_handles; i++) {
1284 syncobjs[i] = drm_syncobj_find(file_private, handles[i]);
1285 if (!syncobjs[i]) {
1286 ret = -ENOENT;
1287 goto err_put_syncobjs;
1288 }
1289 }
1290
1291 kfree(handles);
1292 *syncobjs_out = syncobjs;
1293 return 0;
1294
1295err_put_syncobjs:
1296 while (i-- > 0)
1297 drm_syncobj_put(syncobjs[i]);
1298 kfree(syncobjs);
1299err_free_handles:
1300 kfree(handles);
1301
1302 return ret;
1303}
1304
1305static void drm_syncobj_array_free(struct drm_syncobj **syncobjs,
1306 uint32_t count)
1307{
1308 uint32_t i;
1309
1310 for (i = 0; i < count; i++)
1311 drm_syncobj_put(syncobjs[i]);
1312 kfree(syncobjs);
1313}
1314
1315int
1316drm_syncobj_wait_ioctl(struct drm_device *dev, void *data,
1317 struct drm_file *file_private)
1318{
1319 struct drm_syncobj_wait *args = data;
1320 struct drm_syncobj **syncobjs;
1321 unsigned int possible_flags;
1322 ktime_t t, *tp = NULL;
1323 int ret = 0;
1324
1325 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
1326 return -EOPNOTSUPP;
1327
1328 possible_flags = DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL |
1329 DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
1330 DRM_SYNCOBJ_WAIT_FLAGS_WAIT_DEADLINE;
1331
1332 if (args->flags & ~possible_flags)
1333 return -EINVAL;
1334
1335 if (args->count_handles == 0)
1336 return 0;
1337
1338 ret = drm_syncobj_array_find(file_private,
1339 u64_to_user_ptr(args->handles),
1340 args->count_handles,
1341 &syncobjs);
1342 if (ret < 0)
1343 return ret;
1344
1345 if (args->flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_DEADLINE) {
1346 t = ns_to_ktime(args->deadline_nsec);
1347 tp = &t;
1348 }
1349
1350 ret = drm_syncobj_array_wait(dev, file_private,
1351 args, NULL, syncobjs, false, tp);
1352
1353 drm_syncobj_array_free(syncobjs, args->count_handles);
1354
1355 return ret;
1356}
1357
1358int
1359drm_syncobj_timeline_wait_ioctl(struct drm_device *dev, void *data,
1360 struct drm_file *file_private)
1361{
1362 struct drm_syncobj_timeline_wait *args = data;
1363 struct drm_syncobj **syncobjs;
1364 unsigned int possible_flags;
1365 ktime_t t, *tp = NULL;
1366 int ret = 0;
1367
1368 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1369 return -EOPNOTSUPP;
1370
1371 possible_flags = DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL |
1372 DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
1373 DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE |
1374 DRM_SYNCOBJ_WAIT_FLAGS_WAIT_DEADLINE;
1375
1376 if (args->flags & ~possible_flags)
1377 return -EINVAL;
1378
1379 if (args->count_handles == 0)
1380 return 0;
1381
1382 ret = drm_syncobj_array_find(file_private,
1383 u64_to_user_ptr(args->handles),
1384 args->count_handles,
1385 &syncobjs);
1386 if (ret < 0)
1387 return ret;
1388
1389 if (args->flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_DEADLINE) {
1390 t = ns_to_ktime(args->deadline_nsec);
1391 tp = &t;
1392 }
1393
1394 ret = drm_syncobj_array_wait(dev, file_private,
1395 NULL, args, syncobjs, true, tp);
1396
1397 drm_syncobj_array_free(syncobjs, args->count_handles);
1398
1399 return ret;
1400}
1401
1402static void syncobj_eventfd_entry_fence_func(struct dma_fence *fence,
1403 struct dma_fence_cb *cb)
1404{
1405 struct syncobj_eventfd_entry *entry =
1406 container_of(cb, struct syncobj_eventfd_entry, fence_cb);
1407
1408 eventfd_signal(entry->ev_fd_ctx);
1409 syncobj_eventfd_entry_free(entry);
1410}
1411
1412static void
1413syncobj_eventfd_entry_func(struct drm_syncobj *syncobj,
1414 struct syncobj_eventfd_entry *entry)
1415{
1416 int ret;
1417 struct dma_fence *fence;
1418
1419 /* This happens inside the syncobj lock */
1420 fence = dma_fence_get(rcu_dereference_protected(syncobj->fence, 1));
1421 if (!fence)
1422 return;
1423
1424 ret = dma_fence_chain_find_seqno(&fence, entry->point);
1425 if (ret != 0) {
1426 /* The given seqno has not been submitted yet. */
1427 dma_fence_put(fence);
1428 return;
1429 } else if (!fence) {
1430 /* If dma_fence_chain_find_seqno returns 0 but sets the fence
1431 * to NULL, it implies that the given seqno is signaled and a
1432 * later seqno has already been submitted. Assign a stub fence
1433 * so that the eventfd still gets signaled below.
1434 */
1435 fence = dma_fence_get_stub();
1436 }
1437
1438 list_del_init(&entry->node);
1439 entry->fence = fence;
1440
1441 if (entry->flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) {
1442 eventfd_signal(entry->ev_fd_ctx);
1443 syncobj_eventfd_entry_free(entry);
1444 } else {
1445 ret = dma_fence_add_callback(fence, &entry->fence_cb,
1446 syncobj_eventfd_entry_fence_func);
1447 if (ret == -ENOENT) {
1448 eventfd_signal(entry->ev_fd_ctx);
1449 syncobj_eventfd_entry_free(entry);
1450 }
1451 }
1452}
1453
1454int
1455drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,
1456 struct drm_file *file_private)
1457{
1458 struct drm_syncobj_eventfd *args = data;
1459 struct drm_syncobj *syncobj;
1460 struct eventfd_ctx *ev_fd_ctx;
1461 struct syncobj_eventfd_entry *entry;
1462
1463 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1464 return -EOPNOTSUPP;
1465
1466 if (args->flags & ~DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE)
1467 return -EINVAL;
1468
1469 if (args->pad)
1470 return -EINVAL;
1471
1472 syncobj = drm_syncobj_find(file_private, args->handle);
1473 if (!syncobj)
1474 return -ENOENT;
1475
1476 ev_fd_ctx = eventfd_ctx_fdget(args->fd);
1477 if (IS_ERR(ev_fd_ctx))
1478 return PTR_ERR(ev_fd_ctx);
1479
1480 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1481 if (!entry) {
1482 eventfd_ctx_put(ev_fd_ctx);
1483 return -ENOMEM;
1484 }
1485 entry->syncobj = syncobj;
1486 entry->ev_fd_ctx = ev_fd_ctx;
1487 entry->point = args->point;
1488 entry->flags = args->flags;
1489
1490 drm_syncobj_add_eventfd(syncobj, entry);
1491 drm_syncobj_put(syncobj);
1492
1493 return 0;
1494}
1495
1496int
1497drm_syncobj_reset_ioctl(struct drm_device *dev, void *data,
1498 struct drm_file *file_private)
1499{
1500 struct drm_syncobj_array *args = data;
1501 struct drm_syncobj **syncobjs;
1502 uint32_t i;
1503 int ret;
1504
1505 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
1506 return -EOPNOTSUPP;
1507
1508 if (args->pad != 0)
1509 return -EINVAL;
1510
1511 if (args->count_handles == 0)
1512 return -EINVAL;
1513
1514 ret = drm_syncobj_array_find(file_private,
1515 u64_to_user_ptr(args->handles),
1516 args->count_handles,
1517 &syncobjs);
1518 if (ret < 0)
1519 return ret;
1520
1521 for (i = 0; i < args->count_handles; i++)
1522 drm_syncobj_replace_fence(syncobjs[i], NULL);
1523
1524 drm_syncobj_array_free(syncobjs, args->count_handles);
1525
1526 return 0;
1527}
1528
1529int
1530drm_syncobj_signal_ioctl(struct drm_device *dev, void *data,
1531 struct drm_file *file_private)
1532{
1533 struct drm_syncobj_array *args = data;
1534 struct drm_syncobj **syncobjs;
1535 uint32_t i;
1536 int ret;
1537
1538 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
1539 return -EOPNOTSUPP;
1540
1541 if (args->pad != 0)
1542 return -EINVAL;
1543
1544 if (args->count_handles == 0)
1545 return -EINVAL;
1546
1547 ret = drm_syncobj_array_find(file_private,
1548 u64_to_user_ptr(args->handles),
1549 args->count_handles,
1550 &syncobjs);
1551 if (ret < 0)
1552 return ret;
1553
1554 for (i = 0; i < args->count_handles; i++) {
1555 ret = drm_syncobj_assign_null_handle(syncobjs[i]);
1556 if (ret < 0)
1557 break;
1558 }
1559
1560 drm_syncobj_array_free(syncobjs, args->count_handles);
1561
1562 return ret;
1563}
1564
1565int
1566drm_syncobj_timeline_signal_ioctl(struct drm_device *dev, void *data,
1567 struct drm_file *file_private)
1568{
1569 struct drm_syncobj_timeline_array *args = data;
1570 struct drm_syncobj **syncobjs;
1571 struct dma_fence_chain **chains;
1572 uint64_t *points;
1573 uint32_t i, j;
1574 int ret;
1575
1576 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1577 return -EOPNOTSUPP;
1578
1579 if (args->flags != 0)
1580 return -EINVAL;
1581
1582 if (args->count_handles == 0)
1583 return -EINVAL;
1584
1585 ret = drm_syncobj_array_find(file_private,
1586 u64_to_user_ptr(args->handles),
1587 args->count_handles,
1588 &syncobjs);
1589 if (ret < 0)
1590 return ret;
1591
1592 points = kmalloc_array(args->count_handles, sizeof(*points),
1593 GFP_KERNEL);
1594 if (!points) {
1595 ret = -ENOMEM;
1596 goto out;
1597 }
1598 if (!u64_to_user_ptr(args->points)) {
1599 memset(points, 0, args->count_handles * sizeof(uint64_t));
1600 } else if (copy_from_user(points, u64_to_user_ptr(args->points),
1601 sizeof(uint64_t) * args->count_handles)) {
1602 ret = -EFAULT;
1603 goto err_points;
1604 }
1605
1606 chains = kmalloc_array(args->count_handles, sizeof(void *), GFP_KERNEL);
1607 if (!chains) {
1608 ret = -ENOMEM;
1609 goto err_points;
1610 }
1611 for (i = 0; i < args->count_handles; i++) {
1612 chains[i] = dma_fence_chain_alloc();
1613 if (!chains[i]) {
1614 for (j = 0; j < i; j++)
1615 dma_fence_chain_free(chains[j]);
1616 ret = -ENOMEM;
1617 goto err_chains;
1618 }
1619 }
1620
1621 for (i = 0; i < args->count_handles; i++) {
1622 struct dma_fence *fence = dma_fence_get_stub();
1623
1624 drm_syncobj_add_point(syncobjs[i], chains[i],
1625 fence, points[i]);
1626 dma_fence_put(fence);
1627 }
1628err_chains:
1629 kfree(chains);
1630err_points:
1631 kfree(points);
1632out:
1633 drm_syncobj_array_free(syncobjs, args->count_handles);
1634
1635 return ret;
1636}
1637
1638int drm_syncobj_query_ioctl(struct drm_device *dev, void *data,
1639 struct drm_file *file_private)
1640{
1641 struct drm_syncobj_timeline_array *args = data;
1642 struct drm_syncobj **syncobjs;
1643 uint64_t __user *points = u64_to_user_ptr(args->points);
1644 uint32_t i;
1645 int ret;
1646
1647 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1648 return -EOPNOTSUPP;
1649
1650 if (args->flags & ~DRM_SYNCOBJ_QUERY_FLAGS_LAST_SUBMITTED)
1651 return -EINVAL;
1652
1653 if (args->count_handles == 0)
1654 return -EINVAL;
1655
1656 ret = drm_syncobj_array_find(file_private,
1657 u64_to_user_ptr(args->handles),
1658 args->count_handles,
1659 &syncobjs);
1660 if (ret < 0)
1661 return ret;
1662
1663 for (i = 0; i < args->count_handles; i++) {
1664 struct dma_fence_chain *chain;
1665 struct dma_fence *fence;
1666 uint64_t point;
1667
1668 fence = drm_syncobj_fence_get(syncobjs[i]);
1669 chain = to_dma_fence_chain(fence);
1670 if (chain) {
1671 struct dma_fence *iter, *last_signaled =
1672 dma_fence_get(fence);
1673
1674 if (args->flags &
1675 DRM_SYNCOBJ_QUERY_FLAGS_LAST_SUBMITTED) {
1676 point = fence->seqno;
1677 } else {
1678 dma_fence_chain_for_each(iter, fence) {
1679 if (iter->context != fence->context) {
1680 dma_fence_put(iter);
1681 /* It is most likely that timeline has
1682 * unorder points. */
1683 break;
1684 }
1685 dma_fence_put(last_signaled);
1686 last_signaled = dma_fence_get(iter);
1687 }
1688 point = dma_fence_is_signaled(last_signaled) ?
1689 last_signaled->seqno :
1690 to_dma_fence_chain(last_signaled)->prev_seqno;
1691 }
1692 dma_fence_put(last_signaled);
1693 } else {
1694 point = 0;
1695 }
1696 dma_fence_put(fence);
1697 ret = copy_to_user(&points[i], &point, sizeof(uint64_t));
1698 ret = ret ? -EFAULT : 0;
1699 if (ret)
1700 break;
1701 }
1702 drm_syncobj_array_free(syncobjs, args->count_handles);
1703
1704 return ret;
1705}