2 * Memory-to-memory device framework for Video for Linux 2 and videobuf.
4 * Helper functions for devices that use videobuf buffers for both their
5 * source and destination.
7 * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd.
8 * Pawel Osciak, <pawel@osciak.com>
9 * Marek Szyprowski, <m.szyprowski@samsung.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
16 #include <linux/module.h>
17 #include <linux/sched.h>
18 #include <linux/slab.h>
20 #include <media/videobuf2-core.h>
21 #include <media/v4l2-mem2mem.h>
22 #include <media/v4l2-dev.h>
23 #include <media/v4l2-fh.h>
24 #include <media/v4l2-event.h>
26 MODULE_DESCRIPTION("Mem to mem device framework for videobuf");
27 MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>");
28 MODULE_LICENSE("GPL");
31 module_param(debug
, bool, 0644);
33 #define dprintk(fmt, arg...) \
36 printk(KERN_DEBUG "%s: " fmt, __func__, ## arg);\
40 /* Instance is already queued on the job_queue */
41 #define TRANS_QUEUED (1 << 0)
42 /* Instance is currently running in hardware */
43 #define TRANS_RUNNING (1 << 1)
46 /* Offset base for buffers on the destination queue - used to distinguish
47 * between source and destination buffers when mmapping - they receive the same
48 * offsets but for different queues */
49 #define DST_QUEUE_OFF_BASE (1 << 30)
53 * struct v4l2_m2m_dev - per-device context
54 * @curr_ctx: currently running instance
55 * @job_queue: instances queued to run
56 * @job_spinlock: protects job_queue
57 * @m2m_ops: driver callbacks
60 struct v4l2_m2m_ctx
*curr_ctx
;
62 struct list_head job_queue
;
63 spinlock_t job_spinlock
;
65 struct v4l2_m2m_ops
*m2m_ops
;
68 static struct v4l2_m2m_queue_ctx
*get_queue_ctx(struct v4l2_m2m_ctx
*m2m_ctx
,
69 enum v4l2_buf_type type
)
71 if (V4L2_TYPE_IS_OUTPUT(type
))
72 return &m2m_ctx
->out_q_ctx
;
74 return &m2m_ctx
->cap_q_ctx
;
78 * v4l2_m2m_get_vq() - return vb2_queue for the given type
80 struct vb2_queue
*v4l2_m2m_get_vq(struct v4l2_m2m_ctx
*m2m_ctx
,
81 enum v4l2_buf_type type
)
83 struct v4l2_m2m_queue_ctx
*q_ctx
;
85 q_ctx
= get_queue_ctx(m2m_ctx
, type
);
91 EXPORT_SYMBOL(v4l2_m2m_get_vq
);
94 * v4l2_m2m_next_buf() - return next buffer from the list of ready buffers
96 void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx
*q_ctx
)
98 struct v4l2_m2m_buffer
*b
= NULL
;
101 spin_lock_irqsave(&q_ctx
->rdy_spinlock
, flags
);
103 if (list_empty(&q_ctx
->rdy_queue
)) {
104 spin_unlock_irqrestore(&q_ctx
->rdy_spinlock
, flags
);
108 b
= list_entry(q_ctx
->rdy_queue
.next
, struct v4l2_m2m_buffer
, list
);
109 spin_unlock_irqrestore(&q_ctx
->rdy_spinlock
, flags
);
112 EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf
);
115 * v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and
118 void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx
*q_ctx
)
120 struct v4l2_m2m_buffer
*b
= NULL
;
123 spin_lock_irqsave(&q_ctx
->rdy_spinlock
, flags
);
124 if (list_empty(&q_ctx
->rdy_queue
)) {
125 spin_unlock_irqrestore(&q_ctx
->rdy_spinlock
, flags
);
128 b
= list_entry(q_ctx
->rdy_queue
.next
, struct v4l2_m2m_buffer
, list
);
131 spin_unlock_irqrestore(&q_ctx
->rdy_spinlock
, flags
);
135 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove
);
138 * Scheduling handlers
142 * v4l2_m2m_get_curr_priv() - return driver private data for the currently
143 * running instance or NULL if no instance is running
145 void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev
*m2m_dev
)
150 spin_lock_irqsave(&m2m_dev
->job_spinlock
, flags
);
151 if (m2m_dev
->curr_ctx
)
152 ret
= m2m_dev
->curr_ctx
->priv
;
153 spin_unlock_irqrestore(&m2m_dev
->job_spinlock
, flags
);
157 EXPORT_SYMBOL(v4l2_m2m_get_curr_priv
);
160 * v4l2_m2m_try_run() - select next job to perform and run it if possible
162 * Get next transaction (if present) from the waiting jobs list and run it.
164 static void v4l2_m2m_try_run(struct v4l2_m2m_dev
*m2m_dev
)
168 spin_lock_irqsave(&m2m_dev
->job_spinlock
, flags
);
169 if (NULL
!= m2m_dev
->curr_ctx
) {
170 spin_unlock_irqrestore(&m2m_dev
->job_spinlock
, flags
);
171 dprintk("Another instance is running, won't run now\n");
175 if (list_empty(&m2m_dev
->job_queue
)) {
176 spin_unlock_irqrestore(&m2m_dev
->job_spinlock
, flags
);
177 dprintk("No job pending\n");
181 m2m_dev
->curr_ctx
= list_entry(m2m_dev
->job_queue
.next
,
182 struct v4l2_m2m_ctx
, queue
);
183 m2m_dev
->curr_ctx
->job_flags
|= TRANS_RUNNING
;
184 spin_unlock_irqrestore(&m2m_dev
->job_spinlock
, flags
);
186 m2m_dev
->m2m_ops
->device_run(m2m_dev
->curr_ctx
->priv
);
190 * v4l2_m2m_try_schedule() - check whether an instance is ready to be added to
191 * the pending job queue and add it if so.
192 * @m2m_ctx: m2m context assigned to the instance to be checked
194 * There are three basic requirements an instance has to meet to be able to run:
195 * 1) at least one source buffer has to be queued,
196 * 2) at least one destination buffer has to be queued,
197 * 3) streaming has to be on.
199 * There may also be additional, custom requirements. In such case the driver
200 * should supply a custom callback (job_ready in v4l2_m2m_ops) that should
201 * return 1 if the instance is ready.
202 * An example of the above could be an instance that requires more than one
203 * src/dst buffer per transaction.
205 static void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx
*m2m_ctx
)
207 struct v4l2_m2m_dev
*m2m_dev
;
208 unsigned long flags_job
, flags
;
210 m2m_dev
= m2m_ctx
->m2m_dev
;
211 dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx
);
213 if (!m2m_ctx
->out_q_ctx
.q
.streaming
214 || !m2m_ctx
->cap_q_ctx
.q
.streaming
) {
215 dprintk("Streaming needs to be on for both queues\n");
219 spin_lock_irqsave(&m2m_dev
->job_spinlock
, flags_job
);
220 if (m2m_ctx
->job_flags
& TRANS_QUEUED
) {
221 spin_unlock_irqrestore(&m2m_dev
->job_spinlock
, flags_job
);
222 dprintk("On job queue already\n");
226 spin_lock_irqsave(&m2m_ctx
->out_q_ctx
.rdy_spinlock
, flags
);
227 if (list_empty(&m2m_ctx
->out_q_ctx
.rdy_queue
)) {
228 spin_unlock_irqrestore(&m2m_ctx
->out_q_ctx
.rdy_spinlock
, flags
);
229 spin_unlock_irqrestore(&m2m_dev
->job_spinlock
, flags_job
);
230 dprintk("No input buffers available\n");
233 if (list_empty(&m2m_ctx
->cap_q_ctx
.rdy_queue
)) {
234 spin_unlock_irqrestore(&m2m_ctx
->out_q_ctx
.rdy_spinlock
, flags
);
235 spin_unlock_irqrestore(&m2m_dev
->job_spinlock
, flags_job
);
236 dprintk("No output buffers available\n");
239 spin_unlock_irqrestore(&m2m_ctx
->out_q_ctx
.rdy_spinlock
, flags
);
241 if (m2m_dev
->m2m_ops
->job_ready
242 && (!m2m_dev
->m2m_ops
->job_ready(m2m_ctx
->priv
))) {
243 spin_unlock_irqrestore(&m2m_dev
->job_spinlock
, flags_job
);
244 dprintk("Driver not ready\n");
248 list_add_tail(&m2m_ctx
->queue
, &m2m_dev
->job_queue
);
249 m2m_ctx
->job_flags
|= TRANS_QUEUED
;
251 spin_unlock_irqrestore(&m2m_dev
->job_spinlock
, flags_job
);
253 v4l2_m2m_try_run(m2m_dev
);
257 * v4l2_m2m_job_finish() - inform the framework that a job has been finished
258 * and have it clean up
260 * Called by a driver to yield back the device after it has finished with it.
261 * Should be called as soon as possible after reaching a state which allows
262 * other instances to take control of the device.
264 * This function has to be called only after device_run() callback has been
265 * called on the driver. To prevent recursion, it should not be called directly
266 * from the device_run() callback though.
268 void v4l2_m2m_job_finish(struct v4l2_m2m_dev
*m2m_dev
,
269 struct v4l2_m2m_ctx
*m2m_ctx
)
273 spin_lock_irqsave(&m2m_dev
->job_spinlock
, flags
);
274 if (!m2m_dev
->curr_ctx
|| m2m_dev
->curr_ctx
!= m2m_ctx
) {
275 spin_unlock_irqrestore(&m2m_dev
->job_spinlock
, flags
);
276 dprintk("Called by an instance not currently running\n");
280 list_del(&m2m_dev
->curr_ctx
->queue
);
281 m2m_dev
->curr_ctx
->job_flags
&= ~(TRANS_QUEUED
| TRANS_RUNNING
);
282 wake_up(&m2m_dev
->curr_ctx
->finished
);
283 m2m_dev
->curr_ctx
= NULL
;
285 spin_unlock_irqrestore(&m2m_dev
->job_spinlock
, flags
);
287 /* This instance might have more buffers ready, but since we do not
288 * allow more than one job on the job_queue per instance, each has
289 * to be scheduled separately after the previous one finishes. */
290 v4l2_m2m_try_schedule(m2m_ctx
);
291 v4l2_m2m_try_run(m2m_dev
);
293 EXPORT_SYMBOL(v4l2_m2m_job_finish
);
296 * v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer
298 int v4l2_m2m_reqbufs(struct file
*file
, struct v4l2_m2m_ctx
*m2m_ctx
,
299 struct v4l2_requestbuffers
*reqbufs
)
301 struct vb2_queue
*vq
;
303 vq
= v4l2_m2m_get_vq(m2m_ctx
, reqbufs
->type
);
304 return vb2_reqbufs(vq
, reqbufs
);
306 EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs
);
309 * v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer
311 * See v4l2_m2m_mmap() documentation for details.
313 int v4l2_m2m_querybuf(struct file
*file
, struct v4l2_m2m_ctx
*m2m_ctx
,
314 struct v4l2_buffer
*buf
)
316 struct vb2_queue
*vq
;
320 vq
= v4l2_m2m_get_vq(m2m_ctx
, buf
->type
);
321 ret
= vb2_querybuf(vq
, buf
);
323 /* Adjust MMAP memory offsets for the CAPTURE queue */
324 if (buf
->memory
== V4L2_MEMORY_MMAP
&& !V4L2_TYPE_IS_OUTPUT(vq
->type
)) {
325 if (V4L2_TYPE_IS_MULTIPLANAR(vq
->type
)) {
326 for (i
= 0; i
< buf
->length
; ++i
)
327 buf
->m
.planes
[i
].m
.mem_offset
328 += DST_QUEUE_OFF_BASE
;
330 buf
->m
.offset
+= DST_QUEUE_OFF_BASE
;
336 EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf
);
339 * v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on
342 int v4l2_m2m_qbuf(struct file
*file
, struct v4l2_m2m_ctx
*m2m_ctx
,
343 struct v4l2_buffer
*buf
)
345 struct vb2_queue
*vq
;
348 vq
= v4l2_m2m_get_vq(m2m_ctx
, buf
->type
);
349 ret
= vb2_qbuf(vq
, buf
);
351 v4l2_m2m_try_schedule(m2m_ctx
);
355 EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf
);
358 * v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on
361 int v4l2_m2m_dqbuf(struct file
*file
, struct v4l2_m2m_ctx
*m2m_ctx
,
362 struct v4l2_buffer
*buf
)
364 struct vb2_queue
*vq
;
366 vq
= v4l2_m2m_get_vq(m2m_ctx
, buf
->type
);
367 return vb2_dqbuf(vq
, buf
, file
->f_flags
& O_NONBLOCK
);
369 EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf
);
372 * v4l2_m2m_streamon() - turn on streaming for a video queue
374 int v4l2_m2m_streamon(struct file
*file
, struct v4l2_m2m_ctx
*m2m_ctx
,
375 enum v4l2_buf_type type
)
377 struct vb2_queue
*vq
;
380 vq
= v4l2_m2m_get_vq(m2m_ctx
, type
);
381 ret
= vb2_streamon(vq
, type
);
383 v4l2_m2m_try_schedule(m2m_ctx
);
387 EXPORT_SYMBOL_GPL(v4l2_m2m_streamon
);
390 * v4l2_m2m_streamoff() - turn off streaming for a video queue
392 int v4l2_m2m_streamoff(struct file
*file
, struct v4l2_m2m_ctx
*m2m_ctx
,
393 enum v4l2_buf_type type
)
395 struct vb2_queue
*vq
;
397 vq
= v4l2_m2m_get_vq(m2m_ctx
, type
);
398 return vb2_streamoff(vq
, type
);
400 EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff
);
403 * v4l2_m2m_poll() - poll replacement, for destination buffers only
405 * Call from the driver's poll() function. Will poll both queues. If a buffer
406 * is available to dequeue (with dqbuf) from the source queue, this will
407 * indicate that a non-blocking write can be performed, while read will be
408 * returned in case of the destination queue.
410 unsigned int v4l2_m2m_poll(struct file
*file
, struct v4l2_m2m_ctx
*m2m_ctx
,
411 struct poll_table_struct
*wait
)
413 struct video_device
*vfd
= video_devdata(file
);
414 unsigned long req_events
= poll_requested_events(wait
);
415 struct vb2_queue
*src_q
, *dst_q
;
416 struct vb2_buffer
*src_vb
= NULL
, *dst_vb
= NULL
;
420 if (test_bit(V4L2_FL_USES_V4L2_FH
, &vfd
->flags
)) {
421 struct v4l2_fh
*fh
= file
->private_data
;
423 if (v4l2_event_pending(fh
))
425 else if (req_events
& POLLPRI
)
426 poll_wait(file
, &fh
->wait
, wait
);
427 if (!(req_events
& (POLLOUT
| POLLWRNORM
| POLLIN
| POLLRDNORM
)))
431 src_q
= v4l2_m2m_get_src_vq(m2m_ctx
);
432 dst_q
= v4l2_m2m_get_dst_vq(m2m_ctx
);
435 * There has to be at least one buffer queued on each queued_list, which
436 * means either in driver already or waiting for driver to claim it
437 * and start processing.
439 if ((!src_q
->streaming
|| list_empty(&src_q
->queued_list
))
440 && (!dst_q
->streaming
|| list_empty(&dst_q
->queued_list
))) {
445 if (m2m_ctx
->m2m_dev
->m2m_ops
->unlock
)
446 m2m_ctx
->m2m_dev
->m2m_ops
->unlock(m2m_ctx
->priv
);
448 poll_wait(file
, &src_q
->done_wq
, wait
);
449 poll_wait(file
, &dst_q
->done_wq
, wait
);
451 if (m2m_ctx
->m2m_dev
->m2m_ops
->lock
)
452 m2m_ctx
->m2m_dev
->m2m_ops
->lock(m2m_ctx
->priv
);
454 spin_lock_irqsave(&src_q
->done_lock
, flags
);
455 if (!list_empty(&src_q
->done_list
))
456 src_vb
= list_first_entry(&src_q
->done_list
, struct vb2_buffer
,
458 if (src_vb
&& (src_vb
->state
== VB2_BUF_STATE_DONE
459 || src_vb
->state
== VB2_BUF_STATE_ERROR
))
460 rc
|= POLLOUT
| POLLWRNORM
;
461 spin_unlock_irqrestore(&src_q
->done_lock
, flags
);
463 spin_lock_irqsave(&dst_q
->done_lock
, flags
);
464 if (!list_empty(&dst_q
->done_list
))
465 dst_vb
= list_first_entry(&dst_q
->done_list
, struct vb2_buffer
,
467 if (dst_vb
&& (dst_vb
->state
== VB2_BUF_STATE_DONE
468 || dst_vb
->state
== VB2_BUF_STATE_ERROR
))
469 rc
|= POLLIN
| POLLRDNORM
;
470 spin_unlock_irqrestore(&dst_q
->done_lock
, flags
);
475 EXPORT_SYMBOL_GPL(v4l2_m2m_poll
);
478 * v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer
480 * Call from driver's mmap() function. Will handle mmap() for both queues
481 * seamlessly for videobuffer, which will receive normal per-queue offsets and
482 * proper videobuf queue pointers. The differentiation is made outside videobuf
483 * by adding a predefined offset to buffers from one of the queues and
484 * subtracting it before passing it back to videobuf. Only drivers (and
485 * thus applications) receive modified offsets.
487 int v4l2_m2m_mmap(struct file
*file
, struct v4l2_m2m_ctx
*m2m_ctx
,
488 struct vm_area_struct
*vma
)
490 unsigned long offset
= vma
->vm_pgoff
<< PAGE_SHIFT
;
491 struct vb2_queue
*vq
;
493 if (offset
< DST_QUEUE_OFF_BASE
) {
494 vq
= v4l2_m2m_get_src_vq(m2m_ctx
);
496 vq
= v4l2_m2m_get_dst_vq(m2m_ctx
);
497 vma
->vm_pgoff
-= (DST_QUEUE_OFF_BASE
>> PAGE_SHIFT
);
500 return vb2_mmap(vq
, vma
);
502 EXPORT_SYMBOL(v4l2_m2m_mmap
);
505 * v4l2_m2m_init() - initialize per-driver m2m data
507 * Usually called from driver's probe() function.
509 struct v4l2_m2m_dev
*v4l2_m2m_init(struct v4l2_m2m_ops
*m2m_ops
)
511 struct v4l2_m2m_dev
*m2m_dev
;
514 return ERR_PTR(-EINVAL
);
516 BUG_ON(!m2m_ops
->device_run
);
517 BUG_ON(!m2m_ops
->job_abort
);
519 m2m_dev
= kzalloc(sizeof *m2m_dev
, GFP_KERNEL
);
521 return ERR_PTR(-ENOMEM
);
523 m2m_dev
->curr_ctx
= NULL
;
524 m2m_dev
->m2m_ops
= m2m_ops
;
525 INIT_LIST_HEAD(&m2m_dev
->job_queue
);
526 spin_lock_init(&m2m_dev
->job_spinlock
);
530 EXPORT_SYMBOL_GPL(v4l2_m2m_init
);
533 * v4l2_m2m_release() - cleans up and frees a m2m_dev structure
535 * Usually called from driver's remove() function.
537 void v4l2_m2m_release(struct v4l2_m2m_dev
*m2m_dev
)
541 EXPORT_SYMBOL_GPL(v4l2_m2m_release
);
544 * v4l2_m2m_ctx_init() - allocate and initialize a m2m context
545 * @priv - driver's instance private data
546 * @m2m_dev - a previously initialized m2m_dev struct
547 * @vq_init - a callback for queue type-specific initialization function to be
548 * used for initializing videobuf_queues
550 * Usually called from driver's open() function.
552 struct v4l2_m2m_ctx
*v4l2_m2m_ctx_init(struct v4l2_m2m_dev
*m2m_dev
,
554 int (*queue_init
)(void *priv
, struct vb2_queue
*src_vq
, struct vb2_queue
*dst_vq
))
556 struct v4l2_m2m_ctx
*m2m_ctx
;
557 struct v4l2_m2m_queue_ctx
*out_q_ctx
, *cap_q_ctx
;
560 m2m_ctx
= kzalloc(sizeof *m2m_ctx
, GFP_KERNEL
);
562 return ERR_PTR(-ENOMEM
);
564 m2m_ctx
->priv
= drv_priv
;
565 m2m_ctx
->m2m_dev
= m2m_dev
;
566 init_waitqueue_head(&m2m_ctx
->finished
);
568 out_q_ctx
= &m2m_ctx
->out_q_ctx
;
569 cap_q_ctx
= &m2m_ctx
->cap_q_ctx
;
571 INIT_LIST_HEAD(&out_q_ctx
->rdy_queue
);
572 INIT_LIST_HEAD(&cap_q_ctx
->rdy_queue
);
573 spin_lock_init(&out_q_ctx
->rdy_spinlock
);
574 spin_lock_init(&cap_q_ctx
->rdy_spinlock
);
576 INIT_LIST_HEAD(&m2m_ctx
->queue
);
578 ret
= queue_init(drv_priv
, &out_q_ctx
->q
, &cap_q_ctx
->q
);
588 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init
);
591 * v4l2_m2m_ctx_release() - release m2m context
593 * Usually called from driver's release() function.
595 void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx
*m2m_ctx
)
597 struct v4l2_m2m_dev
*m2m_dev
;
600 m2m_dev
= m2m_ctx
->m2m_dev
;
602 spin_lock_irqsave(&m2m_dev
->job_spinlock
, flags
);
603 if (m2m_ctx
->job_flags
& TRANS_RUNNING
) {
604 spin_unlock_irqrestore(&m2m_dev
->job_spinlock
, flags
);
605 m2m_dev
->m2m_ops
->job_abort(m2m_ctx
->priv
);
606 dprintk("m2m_ctx %p running, will wait to complete", m2m_ctx
);
607 wait_event(m2m_ctx
->finished
, !(m2m_ctx
->job_flags
& TRANS_RUNNING
));
608 } else if (m2m_ctx
->job_flags
& TRANS_QUEUED
) {
609 list_del(&m2m_ctx
->queue
);
610 m2m_ctx
->job_flags
&= ~(TRANS_QUEUED
| TRANS_RUNNING
);
611 spin_unlock_irqrestore(&m2m_dev
->job_spinlock
, flags
);
612 dprintk("m2m_ctx: %p had been on queue and was removed\n",
615 /* Do nothing, was not on queue/running */
616 spin_unlock_irqrestore(&m2m_dev
->job_spinlock
, flags
);
619 vb2_queue_release(&m2m_ctx
->cap_q_ctx
.q
);
620 vb2_queue_release(&m2m_ctx
->out_q_ctx
.q
);
624 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release
);
627 * v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list.
629 * Call from buf_queue(), videobuf_queue_ops callback.
631 void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx
*m2m_ctx
, struct vb2_buffer
*vb
)
633 struct v4l2_m2m_buffer
*b
= container_of(vb
, struct v4l2_m2m_buffer
, vb
);
634 struct v4l2_m2m_queue_ctx
*q_ctx
;
637 q_ctx
= get_queue_ctx(m2m_ctx
, vb
->vb2_queue
->type
);
641 spin_lock_irqsave(&q_ctx
->rdy_spinlock
, flags
);
642 list_add_tail(&b
->list
, &q_ctx
->rdy_queue
);
644 spin_unlock_irqrestore(&q_ctx
->rdy_spinlock
, flags
);
646 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue
);
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