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Dave Airliee9083422017-04-04 13:26:24 +10001/*
2 * Copyright 2017 Red Hat
Dave Airlie5e60a102017-08-25 10:52:22 -07003 * Parts ported from amdgpu (fence wait code).
4 * Copyright 2016 Advanced Micro Devices, Inc.
Dave Airliee9083422017-04-04 13:26:24 +10005 *
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 *
Jason Ekstrandf246ff52019-08-12 09:22:11 -050032 * 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.
Dave Airliee9083422017-04-04 13:26:24 +100036 * Their primary use-case is to implement Vulkan fences and semaphores.
Jason Ekstrandf246ff52019-08-12 09:22:11 -050037 * The syncobj userspace API provides ioctls for several operations:
Dave Airliee9083422017-04-04 13:26:24 +100038 *
Jason Ekstrandf246ff52019-08-12 09:22:11 -050039 * - 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 *
Lionel Landwerlin77d1a6d2020-01-14 14:19:28 +020046 * 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 *
Jason Ekstrandf246ff52019-08-12 09:22:11 -050054 * 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.
Lionel Landwerlin77d1a6d2020-01-14 14:19:28 +020060 *
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
Jason Ekstrandf246ff52019-08-12 09:22:11 -050091 * setting its pointer to a fence which is already signaled.
92 *
Lionel Landwerlin77d1a6d2020-01-14 14:19:28 +020093 * 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 *
Jason Ekstrandf246ff52019-08-12 09:22:11 -0500106 *
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 *
Lionel Landwerlin77d1a6d2020-01-14 14:19:28 +0200129 * 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 *
Jason Ekstrandf246ff52019-08-12 09:22:11 -0500139 *
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.
Lionel Landwerlin77d1a6d2020-01-14 14:19:28 +0200172 *
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.
Dave Airliee9083422017-04-04 13:26:24 +1000184 */
185
Sam Ravnborg0500c042019-05-26 19:35:35 +0200186#include <linux/anon_inodes.h>
Dave Airliee9083422017-04-04 13:26:24 +1000187#include <linux/file.h>
188#include <linux/fs.h>
Jason Ekstrande7aca5032017-08-25 10:52:24 -0700189#include <linux/sched/signal.h>
Sam Ravnborg0500c042019-05-26 19:35:35 +0200190#include <linux/sync_file.h>
191#include <linux/uaccess.h>
192
Sam Ravnborgd89281c2019-07-18 18:15:05 +0200193#include <drm/drm.h>
Sam Ravnborg0500c042019-05-26 19:35:35 +0200194#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>
Ville Syrjäläb9436982019-07-10 15:51:42 +0300199#include <drm/drm_utils.h>
Dave Airliee9083422017-04-04 13:26:24 +1000200
201#include "drm_internal.h"
Dave Airliee9083422017-04-04 13:26:24 +1000202
Christian König61a98b12018-12-11 18:34:41 +0800203struct 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;
Chunming Zhou01d6c352019-04-01 17:50:57 +0800208 u64 point;
Christian König61a98b12018-12-11 18:34:41 +0800209};
210
211static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
212 struct syncobj_wait_entry *wait);
213
Dave Airliee9083422017-04-04 13:26:24 +1000214/**
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 *
Daniel Vetter924fe8d2017-12-14 21:30:52 +0100219 * Returns a reference to the syncobj pointed to by handle or NULL. The
220 * reference must be released by calling drm_syncobj_put().
Dave Airliee9083422017-04-04 13:26:24 +1000221 */
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
Christian König61a98b12018-12-11 18:34:41 +0800240static void drm_syncobj_fence_add_wait(struct drm_syncobj *syncobj,
241 struct syncobj_wait_entry *wait)
Chunming Zhou43cf1fc2018-10-23 17:37:45 +0800242{
Chunming Zhou01d6c352019-04-01 17:50:57 +0800243 struct dma_fence *fence;
244
Christian König61a98b12018-12-11 18:34:41 +0800245 if (wait->fence)
246 return;
Jason Ekstrand337fe9f2018-09-26 02:17:03 -0500247
Eric Anholt131280a2018-11-08 08:04:22 -0800248 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 */
Chunming Zhou01d6c352019-04-01 17:50:57 +0800253 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);
Christian König61a98b12018-12-11 18:34:41 +0800256 list_add_tail(&wait->node, &syncobj->cb_list);
Chunming Zhou01d6c352019-04-01 17:50:57 +0800257 } else if (!fence) {
258 wait->fence = dma_fence_get_stub();
259 } else {
260 wait->fence = fence;
261 }
Eric Anholt131280a2018-11-08 08:04:22 -0800262 spin_unlock(&syncobj->lock);
Chunming Zhou48197bc2018-10-18 14:18:36 +0800263}
Eric Anholt131280a2018-11-08 08:04:22 -0800264
Christian König61a98b12018-12-11 18:34:41 +0800265static void drm_syncobj_remove_wait(struct drm_syncobj *syncobj,
266 struct syncobj_wait_entry *wait)
Eric Anholt131280a2018-11-08 08:04:22 -0800267{
Christian König61a98b12018-12-11 18:34:41 +0800268 if (!wait->node.next)
269 return;
270
Eric Anholt131280a2018-11-08 08:04:22 -0800271 spin_lock(&syncobj->lock);
Christian König61a98b12018-12-11 18:34:41 +0800272 list_del_init(&wait->node);
Eric Anholt131280a2018-11-08 08:04:22 -0800273 spin_unlock(&syncobj->lock);
274}
275
Dave Airliee9083422017-04-04 13:26:24 +1000276/**
Christian König44f8a132019-04-01 17:50:56 +0800277 * 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
Chunming Zhou01d6c352019-04-01 17:50:57 +0800304 list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node)
Christian König44f8a132019-04-01 17:50:56 +0800305 syncobj_wait_syncobj_func(syncobj, cur);
Christian König44f8a132019-04-01 17:50:56 +0800306 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/**
Dave Airliee9083422017-04-04 13:26:24 +1000315 * drm_syncobj_replace_fence - replace fence in a sync object.
Dave Airliee9083422017-04-04 13:26:24 +1000316 * @syncobj: Sync object to replace fence in
317 * @fence: fence to install in sync file.
318 *
Christian König0b258ed2018-11-14 14:24:27 +0100319 * This replaces the fence on a sync object.
Dave Airliee9083422017-04-04 13:26:24 +1000320 */
Chris Wilson00fc2c22017-07-05 21:12:44 +0100321void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
Dave Airliee9083422017-04-04 13:26:24 +1000322 struct dma_fence *fence)
323{
Eric Anholt131280a2018-11-08 08:04:22 -0800324 struct dma_fence *old_fence;
Christian König61a98b12018-12-11 18:34:41 +0800325 struct syncobj_wait_entry *cur, *tmp;
Dave Airliee9083422017-04-04 13:26:24 +1000326
Eric Anholt131280a2018-11-08 08:04:22 -0800327 if (fence)
328 dma_fence_get(fence);
Jason Ekstrand9c19fb12017-08-28 07:39:25 -0700329
Eric Anholt131280a2018-11-08 08:04:22 -0800330 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) {
Chunming Zhou01d6c352019-04-01 17:50:57 +0800337 list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node)
Christian König61a98b12018-12-11 18:34:41 +0800338 syncobj_wait_syncobj_func(syncobj, cur);
Jason Ekstrand9c19fb12017-08-28 07:39:25 -0700339 }
Eric Anholt131280a2018-11-08 08:04:22 -0800340
341 spin_unlock(&syncobj->lock);
342
343 dma_fence_put(old_fence);
Dave Airliee9083422017-04-04 13:26:24 +1000344}
345EXPORT_SYMBOL(drm_syncobj_replace_fence);
346
Christian König86bbd892018-11-13 14:14:00 +0100347/**
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)
Jason Ekstrand1fc08212017-08-25 10:52:25 -0700354{
Christian König86bbd892018-11-13 14:14:00 +0100355 struct dma_fence *fence = dma_fence_get_stub();
Jason Ekstrand1fc08212017-08-25 10:52:25 -0700356
Christian König0b258ed2018-11-14 14:24:27 +0100357 drm_syncobj_replace_fence(syncobj, fence);
Christian König86bbd892018-11-13 14:14:00 +0100358 dma_fence_put(fence);
Jason Ekstrand1fc08212017-08-25 10:52:25 -0700359}
360
Christian Königbc9c80f2019-04-01 17:50:59 +0800361/* 5s default for wait submission */
362#define DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT 5000000000ULL
Daniel Vetter924fe8d2017-12-14 21:30:52 +0100363/**
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.
Chunming Zhou0a6730e2018-08-30 14:48:29 +0800367 * @point: timeline point
Chunming Zhou871edc92018-10-17 15:03:18 +0800368 * @flags: DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT or not
Daniel Vetter924fe8d2017-12-14 21:30:52 +0100369 * @fence: out parameter for the fence
370 *
371 * This is just a convenience function that combines drm_syncobj_find() and
Eric Anholt131280a2018-11-08 08:04:22 -0800372 * drm_syncobj_fence_get().
Daniel Vetter924fe8d2017-12-14 21:30:52 +0100373 *
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 */
Jason Ekstrandafaf5922017-08-25 10:52:19 -0700378int drm_syncobj_find_fence(struct drm_file *file_private,
Chunming Zhou649fdce2018-10-15 16:55:47 +0800379 u32 handle, u64 point, u64 flags,
Jason Ekstrandafaf5922017-08-25 10:52:19 -0700380 struct dma_fence **fence)
Dave Airliee9083422017-04-04 13:26:24 +1000381{
382 struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
Christian Königbc9c80f2019-04-01 17:50:59 +0800383 struct syncobj_wait_entry wait;
384 u64 timeout = nsecs_to_jiffies64(DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT);
385 int ret;
Dave Airliee9083422017-04-04 13:26:24 +1000386
Eric Anholt131280a2018-11-08 08:04:22 -0800387 if (!syncobj)
388 return -ENOENT;
389
390 *fence = drm_syncobj_fence_get(syncobj);
Christian Königbc9c80f2019-04-01 17:50:59 +0800391 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 {
Eric Anholt131280a2018-11-08 08:04:22 -0800399 ret = -EINVAL;
400 }
Christian Königbc9c80f2019-04-01 17:50:59 +0800401
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
Dave Airliee9083422017-04-04 13:26:24 +1000435 return ret;
436}
Jason Ekstrandafaf5922017-08-25 10:52:19 -0700437EXPORT_SYMBOL(drm_syncobj_find_fence);
Dave Airliee9083422017-04-04 13:26:24 +1000438
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);
Christian König0b258ed2018-11-14 14:24:27 +0100450 drm_syncobj_replace_fence(syncobj, NULL);
Dave Airliee9083422017-04-04 13:26:24 +1000451 kfree(syncobj);
452}
453EXPORT_SYMBOL(drm_syncobj_free);
454
Marek Olšák1321fd22017-09-12 22:42:12 +0200455/**
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
Daniel Vetter924fe8d2017-12-14 21:30:52 +0100460 *
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.
Marek Olšák1321fd22017-09-12 22:42:12 +0200466 */
467int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
468 struct dma_fence *fence)
Dave Airliee9083422017-04-04 13:26:24 +1000469{
Dave Airliee9083422017-04-04 13:26:24 +1000470 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);
Jason Ekstrand9c19fb12017-08-28 07:39:25 -0700477 INIT_LIST_HEAD(&syncobj->cb_list);
Eric Anholt131280a2018-11-08 08:04:22 -0800478 spin_lock_init(&syncobj->lock);
Dave Airliee9083422017-04-04 13:26:24 +1000479
Christian König86bbd892018-11-13 14:14:00 +0100480 if (flags & DRM_SYNCOBJ_CREATE_SIGNALED)
481 drm_syncobj_assign_null_handle(syncobj);
Jason Ekstrand1fc08212017-08-25 10:52:25 -0700482
Marek Olšák1321fd22017-09-12 22:42:12 +0200483 if (fence)
Christian König0b258ed2018-11-14 14:24:27 +0100484 drm_syncobj_replace_fence(syncobj, fence);
Marek Olšák1321fd22017-09-12 22:42:12 +0200485
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
Daniel Vetter924fe8d2017-12-14 21:30:52 +0100493 * @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.
Marek Olšák1321fd22017-09-12 22:42:12 +0200501 */
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
Dave Airliee9083422017-04-04 13:26:24 +1000510 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}
Marek Olšák1321fd22017-09-12 22:42:12 +0200525EXPORT_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}
Dave Airliee9083422017-04-04 13:26:24 +1000541
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
Daniel Vetter924fe8d2017-12-14 21:30:52 +0100570/**
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 */
Marek Olšák684fd0a2017-09-12 22:42:13 +0200579int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd)
580{
Chris Wilsone7cdf5c2017-12-19 12:07:00 +0000581 struct file *file;
Marek Olšák684fd0a2017-09-12 22:42:13 +0200582 int fd;
583
584 fd = get_unused_fd_flags(O_CLOEXEC);
585 if (fd < 0)
586 return fd;
587
Chris Wilsone7cdf5c2017-12-19 12:07:00 +0000588 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);
Marek Olšák684fd0a2017-09-12 22:42:13 +0200594 }
Chris Wilsone7cdf5c2017-12-19 12:07:00 +0000595
596 drm_syncobj_get(syncobj);
597 fd_install(fd, file);
598
Marek Olšák684fd0a2017-09-12 22:42:13 +0200599 *p_fd = fd;
600 return 0;
601}
602EXPORT_SYMBOL(drm_syncobj_get_fd);
603
Dave Airliee9083422017-04-04 13:26:24 +1000604static 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;
Dave Airliee9083422017-04-04 13:26:24 +1000609
610 if (!syncobj)
611 return -EINVAL;
612
Marek Olšák684fd0a2017-09-12 22:42:13 +0200613 ret = drm_syncobj_get_fd(syncobj, p_fd);
Dave Airliee9083422017-04-04 13:26:24 +1000614 drm_syncobj_put(syncobj);
615 return ret;
616}
617
Dave Airliee9083422017-04-04 13:26:24 +1000618static int drm_syncobj_fd_to_handle(struct drm_file *file_private,
619 int fd, u32 *handle)
620{
Chris Wilsone7cdf5c2017-12-19 12:07:00 +0000621 struct drm_syncobj *syncobj;
Al Virofb386242019-04-14 12:50:52 -0400622 struct fd f = fdget(fd);
Dave Airliee9083422017-04-04 13:26:24 +1000623 int ret;
624
Al Virofb386242019-04-14 12:50:52 -0400625 if (!f.file)
Dave Airliee9083422017-04-04 13:26:24 +1000626 return -EINVAL;
627
Al Virofb386242019-04-14 12:50:52 -0400628 if (f.file->f_op != &drm_syncobj_file_fops) {
629 fdput(f);
Chris Wilsone7cdf5c2017-12-19 12:07:00 +0000630 return -EINVAL;
631 }
632
Dave Airliee9083422017-04-04 13:26:24 +1000633 /* take a reference to put in the idr */
Al Virofb386242019-04-14 12:50:52 -0400634 syncobj = f.file->private_data;
Dave Airliee9083422017-04-04 13:26:24 +1000635 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
Chris Wilsone7cdf5c2017-12-19 12:07:00 +0000643 if (ret > 0) {
644 *handle = ret;
645 ret = 0;
646 } else
647 drm_syncobj_put(syncobj);
648
Al Virofb386242019-04-14 12:50:52 -0400649 fdput(f);
Chris Wilsone7cdf5c2017-12-19 12:07:00 +0000650 return ret;
Dave Airliee9083422017-04-04 13:26:24 +1000651}
652
Ville Syrjäläa32c94a2017-09-01 19:53:25 +0300653static int drm_syncobj_import_sync_file_fence(struct drm_file *file_private,
654 int fd, int handle)
Dave Airlie3ee45a32017-04-26 04:09:02 +0100655{
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
Christian König0b258ed2018-11-14 14:24:27 +0100668 drm_syncobj_replace_fence(syncobj, fence);
Dave Airlie3ee45a32017-04-26 04:09:02 +0100669 dma_fence_put(fence);
670 drm_syncobj_put(syncobj);
671 return 0;
672}
673
Ville Syrjäläa32c94a2017-09-01 19:53:25 +0300674static int drm_syncobj_export_sync_file(struct drm_file *file_private,
675 int handle, int *p_fd)
Dave Airlie3ee45a32017-04-26 04:09:02 +0100676{
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
Chunming Zhou649fdce2018-10-15 16:55:47 +0800685 ret = drm_syncobj_find_fence(file_private, handle, 0, 0, &fence);
Dave Airlie3ee45a32017-04-26 04:09:02 +0100686 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}
Dave Airliee9083422017-04-04 13:26:24 +1000706/**
707 * drm_syncobj_open - initalizes syncobj file-private structures at devnode open time
Dave Airliee9083422017-04-04 13:26:24 +1000708 * @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{
Chris Wilsone86584c2018-02-12 14:55:33 +0000716 idr_init_base(&file_private->syncobj_idr, 1);
Dave Airliee9083422017-04-04 13:26:24 +1000717 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
Dave Airliee9083422017-04-04 13:26:24 +1000731 * @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))
Chris Wilson69fdf422018-09-13 20:20:50 +0100752 return -EOPNOTSUPP;
Dave Airliee9083422017-04-04 13:26:24 +1000753
754 /* no valid flags yet */
Eric Anholt131280a2018-11-08 08:04:22 -0800755 if (args->flags & ~DRM_SYNCOBJ_CREATE_SIGNALED)
Dave Airliee9083422017-04-04 13:26:24 +1000756 return -EINVAL;
757
Marek Olšák1321fd22017-09-12 22:42:12 +0200758 return drm_syncobj_create_as_handle(file_private,
759 &args->handle, args->flags);
Dave Airliee9083422017-04-04 13:26:24 +1000760}
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))
Chris Wilson69fdf422018-09-13 20:20:50 +0100769 return -EOPNOTSUPP;
Dave Airliee9083422017-04-04 13:26:24 +1000770
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))
Chris Wilson69fdf422018-09-13 20:20:50 +0100784 return -EOPNOTSUPP;
Dave Airliee9083422017-04-04 13:26:24 +1000785
Dave Airlie3ee45a32017-04-26 04:09:02 +0100786 if (args->pad)
Dave Airliee9083422017-04-04 13:26:24 +1000787 return -EINVAL;
788
Dave Airlie3ee45a32017-04-26 04:09:02 +0100789 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
Dave Airliee9083422017-04-04 13:26:24 +1000797 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))
Chris Wilson69fdf422018-09-13 20:20:50 +0100808 return -EOPNOTSUPP;
Dave Airliee9083422017-04-04 13:26:24 +1000809
Dave Airlie3ee45a32017-04-26 04:09:02 +0100810 if (args->pad)
Dave Airliee9083422017-04-04 13:26:24 +1000811 return -EINVAL;
812
Dave Airlie3ee45a32017-04-26 04:09:02 +0100813 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
Dave Airliee9083422017-04-04 13:26:24 +1000822 return drm_syncobj_fd_to_handle(file_private, args->fd,
823 &args->handle);
824}
Dave Airlie5e60a102017-08-25 10:52:22 -0700825
Chunming Zhouea569912019-04-01 17:51:01 +0800826static 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
Lionel Landwerlin060cebb2019-04-16 13:57:50 +0100886 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
Lionel Landwerlin5ec77632019-04-16 13:30:47 +0100887 return -EOPNOTSUPP;
Chunming Zhouea569912019-04-01 17:51:01 +0800888
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
Jason Ekstrande7aca5032017-08-25 10:52:24 -0700900static 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,
Christian König61a98b12018-12-11 18:34:41 +0800910 struct syncobj_wait_entry *wait)
Jason Ekstrande7aca5032017-08-25 10:52:24 -0700911{
Chunming Zhou01d6c352019-04-01 17:50:57 +0800912 struct dma_fence *fence;
913
Eric Anholt131280a2018-11-08 08:04:22 -0800914 /* This happens inside the syncobj lock */
Chunming Zhou01d6c352019-04-01 17:50:57 +0800915 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
Jason Ekstrande7aca5032017-08-25 10:52:24 -0700927 wake_up_process(wait->task);
Chunming Zhou01d6c352019-04-01 17:50:57 +0800928 list_del_init(&wait->node);
Jason Ekstrande7aca5032017-08-25 10:52:24 -0700929}
930
931static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
Chunming Zhou01d6c352019-04-01 17:50:57 +0800932 void __user *user_points,
Jason Ekstrande7aca5032017-08-25 10:52:24 -0700933 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;
Chunming Zhou01d6c352019-04-01 17:50:57 +0800940 uint64_t *points;
Jason Ekstrande7aca5032017-08-25 10:52:24 -0700941 uint32_t signaled_count, i;
942
Chunming Zhou01d6c352019-04-01 17:50:57 +0800943 points = kmalloc_array(count, sizeof(*points), GFP_KERNEL);
944 if (points == NULL)
Jason Ekstrande7aca5032017-08-25 10:52:24 -0700945 return -ENOMEM;
946
Chunming Zhou01d6c352019-04-01 17:50:57 +0800947 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 }
Jason Ekstrande7aca5032017-08-25 10:52:24 -0700961 /* 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) {
Chunming Zhou01d6c352019-04-01 17:50:57 +0800968 struct dma_fence *fence;
969
Jason Ekstrande7aca5032017-08-25 10:52:24 -0700970 entries[i].task = current;
Chunming Zhou01d6c352019-04-01 17:50:57 +0800971 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);
Jason Ekstrande7aca5032017-08-25 10:52:24 -0700975 if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
976 continue;
977 } else {
Chris Wilson12fec622018-09-20 21:05:30 +0100978 timeout = -EINVAL;
Jason Ekstrande7aca5032017-08-25 10:52:24 -0700979 goto cleanup_entries;
980 }
981 }
982
Chunming Zhou01d6c352019-04-01 17:50:57 +0800983 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)) {
Jason Ekstrande7aca5032017-08-25 10:52:24 -0700990 if (signaled_count == 0 && idx)
991 *idx = i;
992 signaled_count++;
993 }
994 }
995
Jason Ekstrande7aca5032017-08-25 10:52:24 -0700996 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) {
Christian König61a98b12018-12-11 18:34:41 +08001009 for (i = 0; i < count; ++i)
1010 drm_syncobj_fence_add_wait(syncobjs[i], &entries[i]);
Jason Ekstrande7aca5032017-08-25 10:52:24 -07001011 }
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
Chunming Zhou01d6c352019-04-01 17:50:57 +08001022 if ((flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) ||
1023 dma_fence_is_signaled(fence) ||
Jason Ekstrande7aca5032017-08-25 10:52:24 -07001024 (!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) {
Chris Wilson12fec622018-09-20 21:05:30 +01001043 timeout = -ETIME;
Jason Ekstrande7aca5032017-08-25 10:52:24 -07001044 goto done_waiting;
1045 }
1046
Chris Wilson12fec622018-09-20 21:05:30 +01001047 if (signal_pending(current)) {
1048 timeout = -ERESTARTSYS;
1049 goto done_waiting;
1050 }
Jason Ekstrande7aca5032017-08-25 10:52:24 -07001051
Chris Wilson12fec622018-09-20 21:05:30 +01001052 timeout = schedule_timeout(timeout);
1053 } while (1);
Jason Ekstrande7aca5032017-08-25 10:52:24 -07001054
1055done_waiting:
1056 __set_current_state(TASK_RUNNING);
1057
1058cleanup_entries:
1059 for (i = 0; i < count; ++i) {
Christian König61a98b12018-12-11 18:34:41 +08001060 drm_syncobj_remove_wait(syncobjs[i], &entries[i]);
Jason Ekstrande7aca5032017-08-25 10:52:24 -07001061 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
Chunming Zhou01d6c352019-04-01 17:50:57 +08001068err_free_points:
1069 kfree(points);
1070
Chris Wilson12fec622018-09-20 21:05:30 +01001071 return timeout;
Jason Ekstrande7aca5032017-08-25 10:52:24 -07001072}
1073
Dave Airlie5e60a102017-08-25 10:52:22 -07001074/**
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 */
Qiang Yu877b372992019-02-25 22:07:16 +08001081signed long drm_timeout_abs_to_jiffies(int64_t timeout_nsec)
Dave Airlie5e60a102017-08-25 10:52:22 -07001082{
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}
Qiang Yu877b372992019-02-25 22:07:16 +08001105EXPORT_SYMBOL(drm_timeout_abs_to_jiffies);
Dave Airlie5e60a102017-08-25 10:52:22 -07001106
Jason Ekstrande7aca5032017-08-25 10:52:24 -07001107static int drm_syncobj_array_wait(struct drm_device *dev,
1108 struct drm_file *file_private,
1109 struct drm_syncobj_wait *wait,
Chunming Zhou01d6c352019-04-01 17:50:57 +08001110 struct drm_syncobj_timeline_wait *timeline_wait,
1111 struct drm_syncobj **syncobjs, bool timeline)
Dave Airlie5e60a102017-08-25 10:52:22 -07001112{
Chunming Zhou01d6c352019-04-01 17:50:57 +08001113 signed long timeout = 0;
Dave Airlie5e60a102017-08-25 10:52:22 -07001114 uint32_t first = ~0;
1115
Chunming Zhou01d6c352019-04-01 17:50:57 +08001116 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 }
Dave Airlie5e60a102017-08-25 10:52:22 -07001137 return 0;
1138}
1139
Jason Ekstrand3e6fb722017-08-25 10:52:26 -07001140static int drm_syncobj_array_find(struct drm_file *file_private,
Ville Syrjälä9e554462017-09-01 19:53:26 +03001141 void __user *user_handles,
1142 uint32_t count_handles,
Jason Ekstrand3e6fb722017-08-25 10:52:26 -07001143 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 for (i = 0; i < count; i++)
1192 drm_syncobj_put(syncobjs[i]);
1193 kfree(syncobjs);
1194}
1195
Dave Airlie5e60a102017-08-25 10:52:22 -07001196int
1197drm_syncobj_wait_ioctl(struct drm_device *dev, void *data,
1198 struct drm_file *file_private)
1199{
1200 struct drm_syncobj_wait *args = data;
Jason Ekstrande7aca5032017-08-25 10:52:24 -07001201 struct drm_syncobj **syncobjs;
Dave Airlie5e60a102017-08-25 10:52:22 -07001202 int ret = 0;
Dave Airlie5e60a102017-08-25 10:52:22 -07001203
1204 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
Chris Wilson69fdf422018-09-13 20:20:50 +01001205 return -EOPNOTSUPP;
Dave Airlie5e60a102017-08-25 10:52:22 -07001206
Jason Ekstrande7aca5032017-08-25 10:52:24 -07001207 if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL |
1208 DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT))
Dave Airlie5e60a102017-08-25 10:52:22 -07001209 return -EINVAL;
1210
1211 if (args->count_handles == 0)
1212 return -EINVAL;
1213
Jason Ekstrand3e6fb722017-08-25 10:52:26 -07001214 ret = drm_syncobj_array_find(file_private,
1215 u64_to_user_ptr(args->handles),
1216 args->count_handles,
1217 &syncobjs);
1218 if (ret < 0)
1219 return ret;
Dave Airlie5e60a102017-08-25 10:52:22 -07001220
Jason Ekstrande7aca5032017-08-25 10:52:24 -07001221 ret = drm_syncobj_array_wait(dev, file_private,
Chunming Zhou01d6c352019-04-01 17:50:57 +08001222 args, NULL, syncobjs, false);
Dave Airlie5e60a102017-08-25 10:52:22 -07001223
Jason Ekstrand3e6fb722017-08-25 10:52:26 -07001224 drm_syncobj_array_free(syncobjs, args->count_handles);
Dave Airlie5e60a102017-08-25 10:52:22 -07001225
1226 return ret;
1227}
Jason Ekstrandaa4035d2017-08-28 14:10:27 -07001228
1229int
Chunming Zhou01d6c352019-04-01 17:50:57 +08001230drm_syncobj_timeline_wait_ioctl(struct drm_device *dev, void *data,
1231 struct drm_file *file_private)
1232{
1233 struct drm_syncobj_timeline_wait *args = data;
1234 struct drm_syncobj **syncobjs;
1235 int ret = 0;
1236
Lionel Landwerlin060cebb2019-04-16 13:57:50 +01001237 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
Lionel Landwerlin5ec77632019-04-16 13:30:47 +01001238 return -EOPNOTSUPP;
Chunming Zhou01d6c352019-04-01 17:50:57 +08001239
1240 if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL |
1241 DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
1242 DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE))
1243 return -EINVAL;
1244
1245 if (args->count_handles == 0)
1246 return -EINVAL;
1247
1248 ret = drm_syncobj_array_find(file_private,
1249 u64_to_user_ptr(args->handles),
1250 args->count_handles,
1251 &syncobjs);
1252 if (ret < 0)
1253 return ret;
1254
1255 ret = drm_syncobj_array_wait(dev, file_private,
1256 NULL, args, syncobjs, true);
1257
1258 drm_syncobj_array_free(syncobjs, args->count_handles);
1259
1260 return ret;
1261}
1262
1263
1264int
Jason Ekstrandaa4035d2017-08-28 14:10:27 -07001265drm_syncobj_reset_ioctl(struct drm_device *dev, void *data,
1266 struct drm_file *file_private)
1267{
1268 struct drm_syncobj_array *args = data;
1269 struct drm_syncobj **syncobjs;
1270 uint32_t i;
1271 int ret;
1272
1273 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
Chris Wilson69fdf422018-09-13 20:20:50 +01001274 return -EOPNOTSUPP;
Jason Ekstrandaa4035d2017-08-28 14:10:27 -07001275
1276 if (args->pad != 0)
1277 return -EINVAL;
1278
1279 if (args->count_handles == 0)
1280 return -EINVAL;
1281
1282 ret = drm_syncobj_array_find(file_private,
1283 u64_to_user_ptr(args->handles),
1284 args->count_handles,
1285 &syncobjs);
1286 if (ret < 0)
1287 return ret;
1288
Eric Anholt131280a2018-11-08 08:04:22 -08001289 for (i = 0; i < args->count_handles; i++)
Christian König0b258ed2018-11-14 14:24:27 +01001290 drm_syncobj_replace_fence(syncobjs[i], NULL);
Eric Anholt131280a2018-11-08 08:04:22 -08001291
Jason Ekstrandaa4035d2017-08-28 14:10:27 -07001292 drm_syncobj_array_free(syncobjs, args->count_handles);
1293
Eric Anholt131280a2018-11-08 08:04:22 -08001294 return 0;
Jason Ekstrandaa4035d2017-08-28 14:10:27 -07001295}
Jason Ekstrandffa94432017-08-28 14:10:28 -07001296
1297int
1298drm_syncobj_signal_ioctl(struct drm_device *dev, void *data,
1299 struct drm_file *file_private)
1300{
1301 struct drm_syncobj_array *args = data;
1302 struct drm_syncobj **syncobjs;
1303 uint32_t i;
1304 int ret;
1305
1306 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
Chris Wilson69fdf422018-09-13 20:20:50 +01001307 return -EOPNOTSUPP;
Jason Ekstrandffa94432017-08-28 14:10:28 -07001308
1309 if (args->pad != 0)
1310 return -EINVAL;
1311
1312 if (args->count_handles == 0)
1313 return -EINVAL;
1314
1315 ret = drm_syncobj_array_find(file_private,
1316 u64_to_user_ptr(args->handles),
1317 args->count_handles,
1318 &syncobjs);
1319 if (ret < 0)
1320 return ret;
1321
Christian König86bbd892018-11-13 14:14:00 +01001322 for (i = 0; i < args->count_handles; i++)
1323 drm_syncobj_assign_null_handle(syncobjs[i]);
Jason Ekstrandffa94432017-08-28 14:10:28 -07001324
1325 drm_syncobj_array_free(syncobjs, args->count_handles);
1326
1327 return ret;
1328}
Chunming Zhou27b575a2019-04-01 17:50:58 +08001329
Chunming Zhou50d1ebe2019-04-01 17:51:02 +08001330int
1331drm_syncobj_timeline_signal_ioctl(struct drm_device *dev, void *data,
1332 struct drm_file *file_private)
1333{
1334 struct drm_syncobj_timeline_array *args = data;
1335 struct drm_syncobj **syncobjs;
1336 struct dma_fence_chain **chains;
1337 uint64_t *points;
1338 uint32_t i, j;
1339 int ret;
1340
Lionel Landwerlin060cebb2019-04-16 13:57:50 +01001341 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
Chunming Zhou50d1ebe2019-04-01 17:51:02 +08001342 return -EOPNOTSUPP;
1343
Chunming Zhou2093dea2019-07-30 21:02:08 +08001344 if (args->flags != 0)
Chunming Zhou50d1ebe2019-04-01 17:51:02 +08001345 return -EINVAL;
1346
1347 if (args->count_handles == 0)
1348 return -EINVAL;
1349
1350 ret = drm_syncobj_array_find(file_private,
1351 u64_to_user_ptr(args->handles),
1352 args->count_handles,
1353 &syncobjs);
1354 if (ret < 0)
1355 return ret;
1356
1357 points = kmalloc_array(args->count_handles, sizeof(*points),
1358 GFP_KERNEL);
1359 if (!points) {
1360 ret = -ENOMEM;
1361 goto out;
1362 }
1363 if (!u64_to_user_ptr(args->points)) {
1364 memset(points, 0, args->count_handles * sizeof(uint64_t));
1365 } else if (copy_from_user(points, u64_to_user_ptr(args->points),
1366 sizeof(uint64_t) * args->count_handles)) {
1367 ret = -EFAULT;
1368 goto err_points;
1369 }
1370
1371 chains = kmalloc_array(args->count_handles, sizeof(void *), GFP_KERNEL);
1372 if (!chains) {
1373 ret = -ENOMEM;
1374 goto err_points;
1375 }
1376 for (i = 0; i < args->count_handles; i++) {
1377 chains[i] = kzalloc(sizeof(struct dma_fence_chain), GFP_KERNEL);
1378 if (!chains[i]) {
1379 for (j = 0; j < i; j++)
1380 kfree(chains[j]);
1381 ret = -ENOMEM;
1382 goto err_chains;
1383 }
1384 }
1385
1386 for (i = 0; i < args->count_handles; i++) {
1387 struct dma_fence *fence = dma_fence_get_stub();
1388
1389 drm_syncobj_add_point(syncobjs[i], chains[i],
1390 fence, points[i]);
1391 dma_fence_put(fence);
1392 }
1393err_chains:
1394 kfree(chains);
1395err_points:
1396 kfree(points);
1397out:
1398 drm_syncobj_array_free(syncobjs, args->count_handles);
1399
1400 return ret;
1401}
1402
Chunming Zhou27b575a2019-04-01 17:50:58 +08001403int drm_syncobj_query_ioctl(struct drm_device *dev, void *data,
1404 struct drm_file *file_private)
1405{
1406 struct drm_syncobj_timeline_array *args = data;
1407 struct drm_syncobj **syncobjs;
1408 uint64_t __user *points = u64_to_user_ptr(args->points);
1409 uint32_t i;
1410 int ret;
1411
Lionel Landwerlin060cebb2019-04-16 13:57:50 +01001412 if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1413 return -EOPNOTSUPP;
Chunming Zhou27b575a2019-04-01 17:50:58 +08001414
Chunming Zhou2093dea2019-07-30 21:02:08 +08001415 if (args->flags & ~DRM_SYNCOBJ_QUERY_FLAGS_LAST_SUBMITTED)
Chunming Zhou27b575a2019-04-01 17:50:58 +08001416 return -EINVAL;
1417
1418 if (args->count_handles == 0)
1419 return -EINVAL;
1420
1421 ret = drm_syncobj_array_find(file_private,
1422 u64_to_user_ptr(args->handles),
1423 args->count_handles,
1424 &syncobjs);
1425 if (ret < 0)
1426 return ret;
1427
1428 for (i = 0; i < args->count_handles; i++) {
1429 struct dma_fence_chain *chain;
1430 struct dma_fence *fence;
1431 uint64_t point;
1432
1433 fence = drm_syncobj_fence_get(syncobjs[i]);
1434 chain = to_dma_fence_chain(fence);
1435 if (chain) {
Chunming Zhou2093dea2019-07-30 21:02:08 +08001436 struct dma_fence *iter, *last_signaled =
1437 dma_fence_get(fence);
Chunming Zhou27b575a2019-04-01 17:50:58 +08001438
Chunming Zhou2093dea2019-07-30 21:02:08 +08001439 if (args->flags &
1440 DRM_SYNCOBJ_QUERY_FLAGS_LAST_SUBMITTED) {
1441 point = fence->seqno;
1442 } else {
1443 dma_fence_chain_for_each(iter, fence) {
1444 if (iter->context != fence->context) {
1445 dma_fence_put(iter);
1446 /* It is most likely that timeline has
1447 * unorder points. */
1448 break;
1449 }
1450 dma_fence_put(last_signaled);
1451 last_signaled = dma_fence_get(iter);
Christian Königb33b5562019-07-22 14:56:25 +02001452 }
Chunming Zhou2093dea2019-07-30 21:02:08 +08001453 point = dma_fence_is_signaled(last_signaled) ?
1454 last_signaled->seqno :
1455 to_dma_fence_chain(last_signaled)->prev_seqno;
Chunming Zhou27b575a2019-04-01 17:50:58 +08001456 }
Chunming Zhou27b575a2019-04-01 17:50:58 +08001457 dma_fence_put(last_signaled);
1458 } else {
1459 point = 0;
1460 }
Chunming Zhou2093dea2019-07-30 21:02:08 +08001461 dma_fence_put(fence);
Chunming Zhou27b575a2019-04-01 17:50:58 +08001462 ret = copy_to_user(&points[i], &point, sizeof(uint64_t));
1463 ret = ret ? -EFAULT : 0;
1464 if (ret)
1465 break;
1466 }
1467 drm_syncobj_array_free(syncobjs, args->count_handles);
1468
1469 return ret;
1470}