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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Memory-to-memory device framework for Video for Linux 2 and videobuf.
4 *
5 * Helper functions for devices that use videobuf buffers for both their
6 * source and destination.
7 *
8 * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd.
9 * Pawel Osciak, <pawel@osciak.com>
10 * Marek Szyprowski, <m.szyprowski@samsung.com>
11 */
12#include <linux/module.h>
13#include <linux/sched.h>
14#include <linux/slab.h>
15
16#include <media/media-device.h>
17#include <media/videobuf2-v4l2.h>
18#include <media/v4l2-mem2mem.h>
19#include <media/v4l2-dev.h>
20#include <media/v4l2-device.h>
21#include <media/v4l2-fh.h>
22#include <media/v4l2-event.h>
23
24MODULE_DESCRIPTION("Mem to mem device framework for videobuf");
25MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>");
26MODULE_LICENSE("GPL");
27
28static bool debug;
29module_param(debug, bool, 0644);
30
31#define dprintk(fmt, arg...) \
32 do { \
33 if (debug) \
34 printk(KERN_DEBUG "%s: " fmt, __func__, ## arg);\
35 } while (0)
36
37
38/* Instance is already queued on the job_queue */
39#define TRANS_QUEUED (1 << 0)
40/* Instance is currently running in hardware */
41#define TRANS_RUNNING (1 << 1)
42/* Instance is currently aborting */
43#define TRANS_ABORT (1 << 2)
44
45
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)
50
51enum v4l2_m2m_entity_type {
52 MEM2MEM_ENT_TYPE_SOURCE,
53 MEM2MEM_ENT_TYPE_SINK,
54 MEM2MEM_ENT_TYPE_PROC
55};
56
57static const char * const m2m_entity_name[] = {
58 "source",
59 "sink",
60 "proc"
61};
62
63/**
64 * struct v4l2_m2m_dev - per-device context
65 * @source: &struct media_entity pointer with the source entity
66 * Used only when the M2M device is registered via
67 * v4l2_m2m_unregister_media_controller().
68 * @source_pad: &struct media_pad with the source pad.
69 * Used only when the M2M device is registered via
70 * v4l2_m2m_unregister_media_controller().
71 * @sink: &struct media_entity pointer with the sink entity
72 * Used only when the M2M device is registered via
73 * v4l2_m2m_unregister_media_controller().
74 * @sink_pad: &struct media_pad with the sink pad.
75 * Used only when the M2M device is registered via
76 * v4l2_m2m_unregister_media_controller().
77 * @proc: &struct media_entity pointer with the M2M device itself.
78 * @proc_pads: &struct media_pad with the @proc pads.
79 * Used only when the M2M device is registered via
80 * v4l2_m2m_unregister_media_controller().
81 * @intf_devnode: &struct media_intf devnode pointer with the interface
82 * with controls the M2M device.
83 * @curr_ctx: currently running instance
84 * @job_queue: instances queued to run
85 * @job_spinlock: protects job_queue
86 * @job_work: worker to run queued jobs.
87 * @m2m_ops: driver callbacks
88 */
89struct v4l2_m2m_dev {
90 struct v4l2_m2m_ctx *curr_ctx;
91#ifdef CONFIG_MEDIA_CONTROLLER
92 struct media_entity *source;
93 struct media_pad source_pad;
94 struct media_entity sink;
95 struct media_pad sink_pad;
96 struct media_entity proc;
97 struct media_pad proc_pads[2];
98 struct media_intf_devnode *intf_devnode;
99#endif
100
101 struct list_head job_queue;
102 spinlock_t job_spinlock;
103 struct work_struct job_work;
104
105 const struct v4l2_m2m_ops *m2m_ops;
106};
107
108static struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx,
109 enum v4l2_buf_type type)
110{
111 if (V4L2_TYPE_IS_OUTPUT(type))
112 return &m2m_ctx->out_q_ctx;
113 else
114 return &m2m_ctx->cap_q_ctx;
115}
116
117struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
118 enum v4l2_buf_type type)
119{
120 struct v4l2_m2m_queue_ctx *q_ctx;
121
122 q_ctx = get_queue_ctx(m2m_ctx, type);
123 if (!q_ctx)
124 return NULL;
125
126 return &q_ctx->q;
127}
128EXPORT_SYMBOL(v4l2_m2m_get_vq);
129
130struct vb2_v4l2_buffer *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx)
131{
132 struct v4l2_m2m_buffer *b;
133 unsigned long flags;
134
135 spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
136
137 if (list_empty(&q_ctx->rdy_queue)) {
138 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
139 return NULL;
140 }
141
142 b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
143 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
144 return &b->vb;
145}
146EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf);
147
148struct vb2_v4l2_buffer *v4l2_m2m_last_buf(struct v4l2_m2m_queue_ctx *q_ctx)
149{
150 struct v4l2_m2m_buffer *b;
151 unsigned long flags;
152
153 spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
154
155 if (list_empty(&q_ctx->rdy_queue)) {
156 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
157 return NULL;
158 }
159
160 b = list_last_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
161 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
162 return &b->vb;
163}
164EXPORT_SYMBOL_GPL(v4l2_m2m_last_buf);
165
166struct vb2_v4l2_buffer *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx)
167{
168 struct v4l2_m2m_buffer *b;
169 unsigned long flags;
170
171 spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
172 if (list_empty(&q_ctx->rdy_queue)) {
173 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
174 return NULL;
175 }
176 b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
177 list_del(&b->list);
178 q_ctx->num_rdy--;
179 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
180
181 return &b->vb;
182}
183EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove);
184
185void v4l2_m2m_buf_remove_by_buf(struct v4l2_m2m_queue_ctx *q_ctx,
186 struct vb2_v4l2_buffer *vbuf)
187{
188 struct v4l2_m2m_buffer *b;
189 unsigned long flags;
190
191 spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
192 b = container_of(vbuf, struct v4l2_m2m_buffer, vb);
193 list_del(&b->list);
194 q_ctx->num_rdy--;
195 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
196}
197EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove_by_buf);
198
199struct vb2_v4l2_buffer *
200v4l2_m2m_buf_remove_by_idx(struct v4l2_m2m_queue_ctx *q_ctx, unsigned int idx)
201
202{
203 struct v4l2_m2m_buffer *b, *tmp;
204 struct vb2_v4l2_buffer *ret = NULL;
205 unsigned long flags;
206
207 spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
208 list_for_each_entry_safe(b, tmp, &q_ctx->rdy_queue, list) {
209 if (b->vb.vb2_buf.index == idx) {
210 list_del(&b->list);
211 q_ctx->num_rdy--;
212 ret = &b->vb;
213 break;
214 }
215 }
216 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
217
218 return ret;
219}
220EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove_by_idx);
221
222/*
223 * Scheduling handlers
224 */
225
226void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev)
227{
228 unsigned long flags;
229 void *ret = NULL;
230
231 spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
232 if (m2m_dev->curr_ctx)
233 ret = m2m_dev->curr_ctx->priv;
234 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
235
236 return ret;
237}
238EXPORT_SYMBOL(v4l2_m2m_get_curr_priv);
239
240/**
241 * v4l2_m2m_try_run() - select next job to perform and run it if possible
242 * @m2m_dev: per-device context
243 *
244 * Get next transaction (if present) from the waiting jobs list and run it.
245 *
246 * Note that this function can run on a given v4l2_m2m_ctx context,
247 * but call .device_run for another context.
248 */
249static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev)
250{
251 unsigned long flags;
252
253 spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
254 if (NULL != m2m_dev->curr_ctx) {
255 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
256 dprintk("Another instance is running, won't run now\n");
257 return;
258 }
259
260 if (list_empty(&m2m_dev->job_queue)) {
261 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
262 dprintk("No job pending\n");
263 return;
264 }
265
266 m2m_dev->curr_ctx = list_first_entry(&m2m_dev->job_queue,
267 struct v4l2_m2m_ctx, queue);
268 m2m_dev->curr_ctx->job_flags |= TRANS_RUNNING;
269 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
270
271 dprintk("Running job on m2m_ctx: %p\n", m2m_dev->curr_ctx);
272 m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv);
273}
274
275/*
276 * __v4l2_m2m_try_queue() - queue a job
277 * @m2m_dev: m2m device
278 * @m2m_ctx: m2m context
279 *
280 * Check if this context is ready to queue a job.
281 *
282 * This function can run in interrupt context.
283 */
284static void __v4l2_m2m_try_queue(struct v4l2_m2m_dev *m2m_dev,
285 struct v4l2_m2m_ctx *m2m_ctx)
286{
287 unsigned long flags_job;
288 struct vb2_v4l2_buffer *dst, *src;
289
290 dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx);
291
292 if (!m2m_ctx->out_q_ctx.q.streaming
293 || !m2m_ctx->cap_q_ctx.q.streaming) {
294 dprintk("Streaming needs to be on for both queues\n");
295 return;
296 }
297
298 spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
299
300 /* If the context is aborted then don't schedule it */
301 if (m2m_ctx->job_flags & TRANS_ABORT) {
302 dprintk("Aborted context\n");
303 goto job_unlock;
304 }
305
306 if (m2m_ctx->job_flags & TRANS_QUEUED) {
307 dprintk("On job queue already\n");
308 goto job_unlock;
309 }
310
311 src = v4l2_m2m_next_src_buf(m2m_ctx);
312 dst = v4l2_m2m_next_dst_buf(m2m_ctx);
313 if (!src && !m2m_ctx->out_q_ctx.buffered) {
314 dprintk("No input buffers available\n");
315 goto job_unlock;
316 }
317 if (!dst && !m2m_ctx->cap_q_ctx.buffered) {
318 dprintk("No output buffers available\n");
319 goto job_unlock;
320 }
321
322 m2m_ctx->new_frame = true;
323
324 if (src && dst && dst->is_held &&
325 dst->vb2_buf.copied_timestamp &&
326 dst->vb2_buf.timestamp != src->vb2_buf.timestamp) {
327 dst->is_held = false;
328 v4l2_m2m_dst_buf_remove(m2m_ctx);
329 v4l2_m2m_buf_done(dst, VB2_BUF_STATE_DONE);
330 dst = v4l2_m2m_next_dst_buf(m2m_ctx);
331
332 if (!dst && !m2m_ctx->cap_q_ctx.buffered) {
333 dprintk("No output buffers available after returning held buffer\n");
334 goto job_unlock;
335 }
336 }
337
338 if (src && dst && (m2m_ctx->out_q_ctx.q.subsystem_flags &
339 VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF))
340 m2m_ctx->new_frame = !dst->vb2_buf.copied_timestamp ||
341 dst->vb2_buf.timestamp != src->vb2_buf.timestamp;
342
343 if (m2m_ctx->has_stopped) {
344 dprintk("Device has stopped\n");
345 goto job_unlock;
346 }
347
348 if (m2m_dev->m2m_ops->job_ready
349 && (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) {
350 dprintk("Driver not ready\n");
351 goto job_unlock;
352 }
353
354 list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue);
355 m2m_ctx->job_flags |= TRANS_QUEUED;
356
357job_unlock:
358 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
359}
360
361/**
362 * v4l2_m2m_try_schedule() - schedule and possibly run a job for any context
363 * @m2m_ctx: m2m context
364 *
365 * Check if this context is ready to queue a job. If suitable,
366 * run the next queued job on the mem2mem device.
367 *
368 * This function shouldn't run in interrupt context.
369 *
370 * Note that v4l2_m2m_try_schedule() can schedule one job for this context,
371 * and then run another job for another context.
372 */
373void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx)
374{
375 struct v4l2_m2m_dev *m2m_dev = m2m_ctx->m2m_dev;
376
377 __v4l2_m2m_try_queue(m2m_dev, m2m_ctx);
378 v4l2_m2m_try_run(m2m_dev);
379}
380EXPORT_SYMBOL_GPL(v4l2_m2m_try_schedule);
381
382/**
383 * v4l2_m2m_device_run_work() - run pending jobs for the context
384 * @work: Work structure used for scheduling the execution of this function.
385 */
386static void v4l2_m2m_device_run_work(struct work_struct *work)
387{
388 struct v4l2_m2m_dev *m2m_dev =
389 container_of(work, struct v4l2_m2m_dev, job_work);
390
391 v4l2_m2m_try_run(m2m_dev);
392}
393
394/**
395 * v4l2_m2m_cancel_job() - cancel pending jobs for the context
396 * @m2m_ctx: m2m context with jobs to be canceled
397 *
398 * In case of streamoff or release called on any context,
399 * 1] If the context is currently running, then abort job will be called
400 * 2] If the context is queued, then the context will be removed from
401 * the job_queue
402 */
403static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx *m2m_ctx)
404{
405 struct v4l2_m2m_dev *m2m_dev;
406 unsigned long flags;
407
408 m2m_dev = m2m_ctx->m2m_dev;
409 spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
410
411 m2m_ctx->job_flags |= TRANS_ABORT;
412 if (m2m_ctx->job_flags & TRANS_RUNNING) {
413 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
414 if (m2m_dev->m2m_ops->job_abort)
415 m2m_dev->m2m_ops->job_abort(m2m_ctx->priv);
416 dprintk("m2m_ctx %p running, will wait to complete\n", m2m_ctx);
417 wait_event(m2m_ctx->finished,
418 !(m2m_ctx->job_flags & TRANS_RUNNING));
419 } else if (m2m_ctx->job_flags & TRANS_QUEUED) {
420 list_del(&m2m_ctx->queue);
421 m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
422 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
423 dprintk("m2m_ctx: %p had been on queue and was removed\n",
424 m2m_ctx);
425 } else {
426 /* Do nothing, was not on queue/running */
427 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
428 }
429}
430
431/*
432 * Schedule the next job, called from v4l2_m2m_job_finish() or
433 * v4l2_m2m_buf_done_and_job_finish().
434 */
435static void v4l2_m2m_schedule_next_job(struct v4l2_m2m_dev *m2m_dev,
436 struct v4l2_m2m_ctx *m2m_ctx)
437{
438 /*
439 * This instance might have more buffers ready, but since we do not
440 * allow more than one job on the job_queue per instance, each has
441 * to be scheduled separately after the previous one finishes.
442 */
443 __v4l2_m2m_try_queue(m2m_dev, m2m_ctx);
444
445 /*
446 * We might be running in atomic context,
447 * but the job must be run in non-atomic context.
448 */
449 schedule_work(&m2m_dev->job_work);
450}
451
452/*
453 * Assumes job_spinlock is held, called from v4l2_m2m_job_finish() or
454 * v4l2_m2m_buf_done_and_job_finish().
455 */
456static bool _v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
457 struct v4l2_m2m_ctx *m2m_ctx)
458{
459 if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) {
460 dprintk("Called by an instance not currently running\n");
461 return false;
462 }
463
464 list_del(&m2m_dev->curr_ctx->queue);
465 m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
466 wake_up(&m2m_dev->curr_ctx->finished);
467 m2m_dev->curr_ctx = NULL;
468 return true;
469}
470
471void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
472 struct v4l2_m2m_ctx *m2m_ctx)
473{
474 unsigned long flags;
475 bool schedule_next;
476
477 /*
478 * This function should not be used for drivers that support
479 * holding capture buffers. Those should use
480 * v4l2_m2m_buf_done_and_job_finish() instead.
481 */
482 WARN_ON(m2m_ctx->out_q_ctx.q.subsystem_flags &
483 VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF);
484 spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
485 schedule_next = _v4l2_m2m_job_finish(m2m_dev, m2m_ctx);
486 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
487
488 if (schedule_next)
489 v4l2_m2m_schedule_next_job(m2m_dev, m2m_ctx);
490}
491EXPORT_SYMBOL(v4l2_m2m_job_finish);
492
493void v4l2_m2m_buf_done_and_job_finish(struct v4l2_m2m_dev *m2m_dev,
494 struct v4l2_m2m_ctx *m2m_ctx,
495 enum vb2_buffer_state state)
496{
497 struct vb2_v4l2_buffer *src_buf, *dst_buf;
498 bool schedule_next = false;
499 unsigned long flags;
500
501 spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
502 src_buf = v4l2_m2m_src_buf_remove(m2m_ctx);
503 dst_buf = v4l2_m2m_next_dst_buf(m2m_ctx);
504
505 if (WARN_ON(!src_buf || !dst_buf))
506 goto unlock;
507 dst_buf->is_held = src_buf->flags & V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
508 if (!dst_buf->is_held) {
509 v4l2_m2m_dst_buf_remove(m2m_ctx);
510 v4l2_m2m_buf_done(dst_buf, state);
511 }
512 /*
513 * If the request API is being used, returning the OUTPUT
514 * (src) buffer will wake-up any process waiting on the
515 * request file descriptor.
516 *
517 * Therefore, return the CAPTURE (dst) buffer first,
518 * to avoid signalling the request file descriptor
519 * before the CAPTURE buffer is done.
520 */
521 v4l2_m2m_buf_done(src_buf, state);
522 schedule_next = _v4l2_m2m_job_finish(m2m_dev, m2m_ctx);
523unlock:
524 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
525
526 if (schedule_next)
527 v4l2_m2m_schedule_next_job(m2m_dev, m2m_ctx);
528}
529EXPORT_SYMBOL(v4l2_m2m_buf_done_and_job_finish);
530
531int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
532 struct v4l2_requestbuffers *reqbufs)
533{
534 struct vb2_queue *vq;
535 int ret;
536
537 vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type);
538 ret = vb2_reqbufs(vq, reqbufs);
539 /* If count == 0, then the owner has released all buffers and he
540 is no longer owner of the queue. Otherwise we have an owner. */
541 if (ret == 0)
542 vq->owner = reqbufs->count ? file->private_data : NULL;
543
544 return ret;
545}
546EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs);
547
548int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
549 struct v4l2_buffer *buf)
550{
551 struct vb2_queue *vq;
552 int ret = 0;
553 unsigned int i;
554
555 vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
556 ret = vb2_querybuf(vq, buf);
557
558 /* Adjust MMAP memory offsets for the CAPTURE queue */
559 if (buf->memory == V4L2_MEMORY_MMAP && V4L2_TYPE_IS_CAPTURE(vq->type)) {
560 if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) {
561 for (i = 0; i < buf->length; ++i)
562 buf->m.planes[i].m.mem_offset
563 += DST_QUEUE_OFF_BASE;
564 } else {
565 buf->m.offset += DST_QUEUE_OFF_BASE;
566 }
567 }
568
569 return ret;
570}
571EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf);
572
573/*
574 * This will add the LAST flag and mark the buffer management
575 * state as stopped.
576 * This is called when the last capture buffer must be flagged as LAST
577 * in draining mode from the encoder/decoder driver buf_queue() callback
578 * or from v4l2_update_last_buf_state() when a capture buffer is available.
579 */
580void v4l2_m2m_last_buffer_done(struct v4l2_m2m_ctx *m2m_ctx,
581 struct vb2_v4l2_buffer *vbuf)
582{
583 vbuf->flags |= V4L2_BUF_FLAG_LAST;
584 vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
585
586 v4l2_m2m_mark_stopped(m2m_ctx);
587}
588EXPORT_SYMBOL_GPL(v4l2_m2m_last_buffer_done);
589
590/* When stop command is issued, update buffer management state */
591static int v4l2_update_last_buf_state(struct v4l2_m2m_ctx *m2m_ctx)
592{
593 struct vb2_v4l2_buffer *next_dst_buf;
594
595 if (m2m_ctx->is_draining)
596 return -EBUSY;
597
598 if (m2m_ctx->has_stopped)
599 return 0;
600
601 m2m_ctx->last_src_buf = v4l2_m2m_last_src_buf(m2m_ctx);
602 m2m_ctx->is_draining = true;
603
604 /*
605 * The processing of the last output buffer queued before
606 * the STOP command is expected to mark the buffer management
607 * state as stopped with v4l2_m2m_mark_stopped().
608 */
609 if (m2m_ctx->last_src_buf)
610 return 0;
611
612 /*
613 * In case the output queue is empty, try to mark the last capture
614 * buffer as LAST.
615 */
616 next_dst_buf = v4l2_m2m_dst_buf_remove(m2m_ctx);
617 if (!next_dst_buf) {
618 /*
619 * Wait for the next queued one in encoder/decoder driver
620 * buf_queue() callback using the v4l2_m2m_dst_buf_is_last()
621 * helper or in v4l2_m2m_qbuf() if encoder/decoder is not yet
622 * streaming.
623 */
624 m2m_ctx->next_buf_last = true;
625 return 0;
626 }
627
628 v4l2_m2m_last_buffer_done(m2m_ctx, next_dst_buf);
629
630 return 0;
631}
632
633/*
634 * Updates the encoding/decoding buffer management state, should
635 * be called from encoder/decoder drivers start_streaming()
636 */
637void v4l2_m2m_update_start_streaming_state(struct v4l2_m2m_ctx *m2m_ctx,
638 struct vb2_queue *q)
639{
640 /* If start streaming again, untag the last output buffer */
641 if (V4L2_TYPE_IS_OUTPUT(q->type))
642 m2m_ctx->last_src_buf = NULL;
643}
644EXPORT_SYMBOL_GPL(v4l2_m2m_update_start_streaming_state);
645
646/*
647 * Updates the encoding/decoding buffer management state, should
648 * be called from encoder/decoder driver stop_streaming()
649 */
650void v4l2_m2m_update_stop_streaming_state(struct v4l2_m2m_ctx *m2m_ctx,
651 struct vb2_queue *q)
652{
653 if (V4L2_TYPE_IS_OUTPUT(q->type)) {
654 /*
655 * If in draining state, either mark next dst buffer as
656 * done or flag next one to be marked as done either
657 * in encoder/decoder driver buf_queue() callback using
658 * the v4l2_m2m_dst_buf_is_last() helper or in v4l2_m2m_qbuf()
659 * if encoder/decoder is not yet streaming
660 */
661 if (m2m_ctx->is_draining) {
662 struct vb2_v4l2_buffer *next_dst_buf;
663
664 m2m_ctx->last_src_buf = NULL;
665 next_dst_buf = v4l2_m2m_dst_buf_remove(m2m_ctx);
666 if (!next_dst_buf)
667 m2m_ctx->next_buf_last = true;
668 else
669 v4l2_m2m_last_buffer_done(m2m_ctx,
670 next_dst_buf);
671 }
672 } else {
673 v4l2_m2m_clear_state(m2m_ctx);
674 }
675}
676EXPORT_SYMBOL_GPL(v4l2_m2m_update_stop_streaming_state);
677
678static void v4l2_m2m_force_last_buf_done(struct v4l2_m2m_ctx *m2m_ctx,
679 struct vb2_queue *q)
680{
681 struct vb2_buffer *vb;
682 struct vb2_v4l2_buffer *vbuf;
683 unsigned int i;
684
685 if (WARN_ON(q->is_output))
686 return;
687 if (list_empty(&q->queued_list))
688 return;
689
690 vb = list_first_entry(&q->queued_list, struct vb2_buffer, queued_entry);
691 for (i = 0; i < vb->num_planes; i++)
692 vb2_set_plane_payload(vb, i, 0);
693
694 /*
695 * Since the buffer hasn't been queued to the ready queue,
696 * mark is active and owned before marking it LAST and DONE
697 */
698 vb->state = VB2_BUF_STATE_ACTIVE;
699 atomic_inc(&q->owned_by_drv_count);
700
701 vbuf = to_vb2_v4l2_buffer(vb);
702 vbuf->field = V4L2_FIELD_NONE;
703
704 v4l2_m2m_last_buffer_done(m2m_ctx, vbuf);
705}
706
707int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
708 struct v4l2_buffer *buf)
709{
710 struct video_device *vdev = video_devdata(file);
711 struct vb2_queue *vq;
712 int ret;
713
714 vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
715 if (V4L2_TYPE_IS_CAPTURE(vq->type) &&
716 (buf->flags & V4L2_BUF_FLAG_REQUEST_FD)) {
717 dprintk("%s: requests cannot be used with capture buffers\n",
718 __func__);
719 return -EPERM;
720 }
721
722 ret = vb2_qbuf(vq, vdev->v4l2_dev->mdev, buf);
723 if (ret)
724 return ret;
725
726 /*
727 * If the capture queue is streaming, but streaming hasn't started
728 * on the device, but was asked to stop, mark the previously queued
729 * buffer as DONE with LAST flag since it won't be queued on the
730 * device.
731 */
732 if (V4L2_TYPE_IS_CAPTURE(vq->type) &&
733 vb2_is_streaming(vq) && !vb2_start_streaming_called(vq) &&
734 (v4l2_m2m_has_stopped(m2m_ctx) || v4l2_m2m_dst_buf_is_last(m2m_ctx)))
735 v4l2_m2m_force_last_buf_done(m2m_ctx, vq);
736 else if (!(buf->flags & V4L2_BUF_FLAG_IN_REQUEST))
737 v4l2_m2m_try_schedule(m2m_ctx);
738
739 return 0;
740}
741EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf);
742
743int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
744 struct v4l2_buffer *buf)
745{
746 struct vb2_queue *vq;
747
748 vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
749 return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK);
750}
751EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf);
752
753int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
754 struct v4l2_buffer *buf)
755{
756 struct video_device *vdev = video_devdata(file);
757 struct vb2_queue *vq;
758
759 vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
760 return vb2_prepare_buf(vq, vdev->v4l2_dev->mdev, buf);
761}
762EXPORT_SYMBOL_GPL(v4l2_m2m_prepare_buf);
763
764int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
765 struct v4l2_create_buffers *create)
766{
767 struct vb2_queue *vq;
768
769 vq = v4l2_m2m_get_vq(m2m_ctx, create->format.type);
770 return vb2_create_bufs(vq, create);
771}
772EXPORT_SYMBOL_GPL(v4l2_m2m_create_bufs);
773
774int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
775 struct v4l2_exportbuffer *eb)
776{
777 struct vb2_queue *vq;
778
779 vq = v4l2_m2m_get_vq(m2m_ctx, eb->type);
780 return vb2_expbuf(vq, eb);
781}
782EXPORT_SYMBOL_GPL(v4l2_m2m_expbuf);
783
784int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
785 enum v4l2_buf_type type)
786{
787 struct vb2_queue *vq;
788 int ret;
789
790 vq = v4l2_m2m_get_vq(m2m_ctx, type);
791 ret = vb2_streamon(vq, type);
792 if (!ret)
793 v4l2_m2m_try_schedule(m2m_ctx);
794
795 return ret;
796}
797EXPORT_SYMBOL_GPL(v4l2_m2m_streamon);
798
799int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
800 enum v4l2_buf_type type)
801{
802 struct v4l2_m2m_dev *m2m_dev;
803 struct v4l2_m2m_queue_ctx *q_ctx;
804 unsigned long flags_job, flags;
805 int ret;
806
807 /* wait until the current context is dequeued from job_queue */
808 v4l2_m2m_cancel_job(m2m_ctx);
809
810 q_ctx = get_queue_ctx(m2m_ctx, type);
811 ret = vb2_streamoff(&q_ctx->q, type);
812 if (ret)
813 return ret;
814
815 m2m_dev = m2m_ctx->m2m_dev;
816 spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
817 /* We should not be scheduled anymore, since we're dropping a queue. */
818 if (m2m_ctx->job_flags & TRANS_QUEUED)
819 list_del(&m2m_ctx->queue);
820 m2m_ctx->job_flags = 0;
821
822 spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
823 /* Drop queue, since streamoff returns device to the same state as after
824 * calling reqbufs. */
825 INIT_LIST_HEAD(&q_ctx->rdy_queue);
826 q_ctx->num_rdy = 0;
827 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
828
829 if (m2m_dev->curr_ctx == m2m_ctx) {
830 m2m_dev->curr_ctx = NULL;
831 wake_up(&m2m_ctx->finished);
832 }
833 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
834
835 return 0;
836}
837EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff);
838
839static __poll_t v4l2_m2m_poll_for_data(struct file *file,
840 struct v4l2_m2m_ctx *m2m_ctx,
841 struct poll_table_struct *wait)
842{
843 struct vb2_queue *src_q, *dst_q;
844 struct vb2_buffer *src_vb = NULL, *dst_vb = NULL;
845 __poll_t rc = 0;
846 unsigned long flags;
847
848 src_q = v4l2_m2m_get_src_vq(m2m_ctx);
849 dst_q = v4l2_m2m_get_dst_vq(m2m_ctx);
850
851 poll_wait(file, &src_q->done_wq, wait);
852 poll_wait(file, &dst_q->done_wq, wait);
853
854 /*
855 * There has to be at least one buffer queued on each queued_list, which
856 * means either in driver already or waiting for driver to claim it
857 * and start processing.
858 */
859 if ((!src_q->streaming || src_q->error ||
860 list_empty(&src_q->queued_list)) &&
861 (!dst_q->streaming || dst_q->error ||
862 list_empty(&dst_q->queued_list)))
863 return EPOLLERR;
864
865 spin_lock_irqsave(&dst_q->done_lock, flags);
866 if (list_empty(&dst_q->done_list)) {
867 /*
868 * If the last buffer was dequeued from the capture queue,
869 * return immediately. DQBUF will return -EPIPE.
870 */
871 if (dst_q->last_buffer_dequeued) {
872 spin_unlock_irqrestore(&dst_q->done_lock, flags);
873 return EPOLLIN | EPOLLRDNORM;
874 }
875 }
876 spin_unlock_irqrestore(&dst_q->done_lock, flags);
877
878 spin_lock_irqsave(&src_q->done_lock, flags);
879 if (!list_empty(&src_q->done_list))
880 src_vb = list_first_entry(&src_q->done_list, struct vb2_buffer,
881 done_entry);
882 if (src_vb && (src_vb->state == VB2_BUF_STATE_DONE
883 || src_vb->state == VB2_BUF_STATE_ERROR))
884 rc |= EPOLLOUT | EPOLLWRNORM;
885 spin_unlock_irqrestore(&src_q->done_lock, flags);
886
887 spin_lock_irqsave(&dst_q->done_lock, flags);
888 if (!list_empty(&dst_q->done_list))
889 dst_vb = list_first_entry(&dst_q->done_list, struct vb2_buffer,
890 done_entry);
891 if (dst_vb && (dst_vb->state == VB2_BUF_STATE_DONE
892 || dst_vb->state == VB2_BUF_STATE_ERROR))
893 rc |= EPOLLIN | EPOLLRDNORM;
894 spin_unlock_irqrestore(&dst_q->done_lock, flags);
895
896 return rc;
897}
898
899__poll_t v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
900 struct poll_table_struct *wait)
901{
902 struct video_device *vfd = video_devdata(file);
903 __poll_t req_events = poll_requested_events(wait);
904 __poll_t rc = 0;
905
906 if (req_events & (EPOLLOUT | EPOLLWRNORM | EPOLLIN | EPOLLRDNORM))
907 rc = v4l2_m2m_poll_for_data(file, m2m_ctx, wait);
908
909 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
910 struct v4l2_fh *fh = file->private_data;
911
912 poll_wait(file, &fh->wait, wait);
913 if (v4l2_event_pending(fh))
914 rc |= EPOLLPRI;
915 }
916
917 return rc;
918}
919EXPORT_SYMBOL_GPL(v4l2_m2m_poll);
920
921int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
922 struct vm_area_struct *vma)
923{
924 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
925 struct vb2_queue *vq;
926
927 if (offset < DST_QUEUE_OFF_BASE) {
928 vq = v4l2_m2m_get_src_vq(m2m_ctx);
929 } else {
930 vq = v4l2_m2m_get_dst_vq(m2m_ctx);
931 vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT);
932 }
933
934 return vb2_mmap(vq, vma);
935}
936EXPORT_SYMBOL(v4l2_m2m_mmap);
937
938#if defined(CONFIG_MEDIA_CONTROLLER)
939void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev)
940{
941 media_remove_intf_links(&m2m_dev->intf_devnode->intf);
942 media_devnode_remove(m2m_dev->intf_devnode);
943
944 media_entity_remove_links(m2m_dev->source);
945 media_entity_remove_links(&m2m_dev->sink);
946 media_entity_remove_links(&m2m_dev->proc);
947 media_device_unregister_entity(m2m_dev->source);
948 media_device_unregister_entity(&m2m_dev->sink);
949 media_device_unregister_entity(&m2m_dev->proc);
950 kfree(m2m_dev->source->name);
951 kfree(m2m_dev->sink.name);
952 kfree(m2m_dev->proc.name);
953}
954EXPORT_SYMBOL_GPL(v4l2_m2m_unregister_media_controller);
955
956static int v4l2_m2m_register_entity(struct media_device *mdev,
957 struct v4l2_m2m_dev *m2m_dev, enum v4l2_m2m_entity_type type,
958 struct video_device *vdev, int function)
959{
960 struct media_entity *entity;
961 struct media_pad *pads;
962 char *name;
963 unsigned int len;
964 int num_pads;
965 int ret;
966
967 switch (type) {
968 case MEM2MEM_ENT_TYPE_SOURCE:
969 entity = m2m_dev->source;
970 pads = &m2m_dev->source_pad;
971 pads[0].flags = MEDIA_PAD_FL_SOURCE;
972 num_pads = 1;
973 break;
974 case MEM2MEM_ENT_TYPE_SINK:
975 entity = &m2m_dev->sink;
976 pads = &m2m_dev->sink_pad;
977 pads[0].flags = MEDIA_PAD_FL_SINK;
978 num_pads = 1;
979 break;
980 case MEM2MEM_ENT_TYPE_PROC:
981 entity = &m2m_dev->proc;
982 pads = m2m_dev->proc_pads;
983 pads[0].flags = MEDIA_PAD_FL_SINK;
984 pads[1].flags = MEDIA_PAD_FL_SOURCE;
985 num_pads = 2;
986 break;
987 default:
988 return -EINVAL;
989 }
990
991 entity->obj_type = MEDIA_ENTITY_TYPE_BASE;
992 if (type != MEM2MEM_ENT_TYPE_PROC) {
993 entity->info.dev.major = VIDEO_MAJOR;
994 entity->info.dev.minor = vdev->minor;
995 }
996 len = strlen(vdev->name) + 2 + strlen(m2m_entity_name[type]);
997 name = kmalloc(len, GFP_KERNEL);
998 if (!name)
999 return -ENOMEM;
1000 snprintf(name, len, "%s-%s", vdev->name, m2m_entity_name[type]);
1001 entity->name = name;
1002 entity->function = function;
1003
1004 ret = media_entity_pads_init(entity, num_pads, pads);
1005 if (ret)
1006 return ret;
1007 ret = media_device_register_entity(mdev, entity);
1008 if (ret)
1009 return ret;
1010
1011 return 0;
1012}
1013
1014int v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
1015 struct video_device *vdev, int function)
1016{
1017 struct media_device *mdev = vdev->v4l2_dev->mdev;
1018 struct media_link *link;
1019 int ret;
1020
1021 if (!mdev)
1022 return 0;
1023
1024 /* A memory-to-memory device consists in two
1025 * DMA engine and one video processing entities.
1026 * The DMA engine entities are linked to a V4L interface
1027 */
1028
1029 /* Create the three entities with their pads */
1030 m2m_dev->source = &vdev->entity;
1031 ret = v4l2_m2m_register_entity(mdev, m2m_dev,
1032 MEM2MEM_ENT_TYPE_SOURCE, vdev, MEDIA_ENT_F_IO_V4L);
1033 if (ret)
1034 return ret;
1035 ret = v4l2_m2m_register_entity(mdev, m2m_dev,
1036 MEM2MEM_ENT_TYPE_PROC, vdev, function);
1037 if (ret)
1038 goto err_rel_entity0;
1039 ret = v4l2_m2m_register_entity(mdev, m2m_dev,
1040 MEM2MEM_ENT_TYPE_SINK, vdev, MEDIA_ENT_F_IO_V4L);
1041 if (ret)
1042 goto err_rel_entity1;
1043
1044 /* Connect the three entities */
1045 ret = media_create_pad_link(m2m_dev->source, 0, &m2m_dev->proc, 0,
1046 MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
1047 if (ret)
1048 goto err_rel_entity2;
1049
1050 ret = media_create_pad_link(&m2m_dev->proc, 1, &m2m_dev->sink, 0,
1051 MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
1052 if (ret)
1053 goto err_rm_links0;
1054
1055 /* Create video interface */
1056 m2m_dev->intf_devnode = media_devnode_create(mdev,
1057 MEDIA_INTF_T_V4L_VIDEO, 0,
1058 VIDEO_MAJOR, vdev->minor);
1059 if (!m2m_dev->intf_devnode) {
1060 ret = -ENOMEM;
1061 goto err_rm_links1;
1062 }
1063
1064 /* Connect the two DMA engines to the interface */
1065 link = media_create_intf_link(m2m_dev->source,
1066 &m2m_dev->intf_devnode->intf,
1067 MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
1068 if (!link) {
1069 ret = -ENOMEM;
1070 goto err_rm_devnode;
1071 }
1072
1073 link = media_create_intf_link(&m2m_dev->sink,
1074 &m2m_dev->intf_devnode->intf,
1075 MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
1076 if (!link) {
1077 ret = -ENOMEM;
1078 goto err_rm_intf_link;
1079 }
1080 return 0;
1081
1082err_rm_intf_link:
1083 media_remove_intf_links(&m2m_dev->intf_devnode->intf);
1084err_rm_devnode:
1085 media_devnode_remove(m2m_dev->intf_devnode);
1086err_rm_links1:
1087 media_entity_remove_links(&m2m_dev->sink);
1088err_rm_links0:
1089 media_entity_remove_links(&m2m_dev->proc);
1090 media_entity_remove_links(m2m_dev->source);
1091err_rel_entity2:
1092 media_device_unregister_entity(&m2m_dev->proc);
1093 kfree(m2m_dev->proc.name);
1094err_rel_entity1:
1095 media_device_unregister_entity(&m2m_dev->sink);
1096 kfree(m2m_dev->sink.name);
1097err_rel_entity0:
1098 media_device_unregister_entity(m2m_dev->source);
1099 kfree(m2m_dev->source->name);
1100 return ret;
1101 return 0;
1102}
1103EXPORT_SYMBOL_GPL(v4l2_m2m_register_media_controller);
1104#endif
1105
1106struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops)
1107{
1108 struct v4l2_m2m_dev *m2m_dev;
1109
1110 if (!m2m_ops || WARN_ON(!m2m_ops->device_run))
1111 return ERR_PTR(-EINVAL);
1112
1113 m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL);
1114 if (!m2m_dev)
1115 return ERR_PTR(-ENOMEM);
1116
1117 m2m_dev->curr_ctx = NULL;
1118 m2m_dev->m2m_ops = m2m_ops;
1119 INIT_LIST_HEAD(&m2m_dev->job_queue);
1120 spin_lock_init(&m2m_dev->job_spinlock);
1121 INIT_WORK(&m2m_dev->job_work, v4l2_m2m_device_run_work);
1122
1123 return m2m_dev;
1124}
1125EXPORT_SYMBOL_GPL(v4l2_m2m_init);
1126
1127void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev)
1128{
1129 kfree(m2m_dev);
1130}
1131EXPORT_SYMBOL_GPL(v4l2_m2m_release);
1132
1133struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
1134 void *drv_priv,
1135 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq))
1136{
1137 struct v4l2_m2m_ctx *m2m_ctx;
1138 struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx;
1139 int ret;
1140
1141 m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL);
1142 if (!m2m_ctx)
1143 return ERR_PTR(-ENOMEM);
1144
1145 m2m_ctx->priv = drv_priv;
1146 m2m_ctx->m2m_dev = m2m_dev;
1147 init_waitqueue_head(&m2m_ctx->finished);
1148
1149 out_q_ctx = &m2m_ctx->out_q_ctx;
1150 cap_q_ctx = &m2m_ctx->cap_q_ctx;
1151
1152 INIT_LIST_HEAD(&out_q_ctx->rdy_queue);
1153 INIT_LIST_HEAD(&cap_q_ctx->rdy_queue);
1154 spin_lock_init(&out_q_ctx->rdy_spinlock);
1155 spin_lock_init(&cap_q_ctx->rdy_spinlock);
1156
1157 INIT_LIST_HEAD(&m2m_ctx->queue);
1158
1159 ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q);
1160
1161 if (ret)
1162 goto err;
1163 /*
1164 * Both queues should use same the mutex to lock the m2m context.
1165 * This lock is used in some v4l2_m2m_* helpers.
1166 */
1167 if (WARN_ON(out_q_ctx->q.lock != cap_q_ctx->q.lock)) {
1168 ret = -EINVAL;
1169 goto err;
1170 }
1171 m2m_ctx->q_lock = out_q_ctx->q.lock;
1172
1173 return m2m_ctx;
1174err:
1175 kfree(m2m_ctx);
1176 return ERR_PTR(ret);
1177}
1178EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init);
1179
1180void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx)
1181{
1182 /* wait until the current context is dequeued from job_queue */
1183 v4l2_m2m_cancel_job(m2m_ctx);
1184
1185 vb2_queue_release(&m2m_ctx->cap_q_ctx.q);
1186 vb2_queue_release(&m2m_ctx->out_q_ctx.q);
1187
1188 kfree(m2m_ctx);
1189}
1190EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release);
1191
1192void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
1193 struct vb2_v4l2_buffer *vbuf)
1194{
1195 struct v4l2_m2m_buffer *b = container_of(vbuf,
1196 struct v4l2_m2m_buffer, vb);
1197 struct v4l2_m2m_queue_ctx *q_ctx;
1198 unsigned long flags;
1199
1200 q_ctx = get_queue_ctx(m2m_ctx, vbuf->vb2_buf.vb2_queue->type);
1201 if (!q_ctx)
1202 return;
1203
1204 spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
1205 list_add_tail(&b->list, &q_ctx->rdy_queue);
1206 q_ctx->num_rdy++;
1207 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
1208}
1209EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue);
1210
1211void v4l2_m2m_buf_copy_metadata(const struct vb2_v4l2_buffer *out_vb,
1212 struct vb2_v4l2_buffer *cap_vb,
1213 bool copy_frame_flags)
1214{
1215 u32 mask = V4L2_BUF_FLAG_TIMECODE | V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
1216
1217 if (copy_frame_flags)
1218 mask |= V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_PFRAME |
1219 V4L2_BUF_FLAG_BFRAME;
1220
1221 cap_vb->vb2_buf.timestamp = out_vb->vb2_buf.timestamp;
1222
1223 if (out_vb->flags & V4L2_BUF_FLAG_TIMECODE)
1224 cap_vb->timecode = out_vb->timecode;
1225 cap_vb->field = out_vb->field;
1226 cap_vb->flags &= ~mask;
1227 cap_vb->flags |= out_vb->flags & mask;
1228 cap_vb->vb2_buf.copied_timestamp = 1;
1229}
1230EXPORT_SYMBOL_GPL(v4l2_m2m_buf_copy_metadata);
1231
1232void v4l2_m2m_request_queue(struct media_request *req)
1233{
1234 struct media_request_object *obj, *obj_safe;
1235 struct v4l2_m2m_ctx *m2m_ctx = NULL;
1236
1237 /*
1238 * Queue all objects. Note that buffer objects are at the end of the
1239 * objects list, after all other object types. Once buffer objects
1240 * are queued, the driver might delete them immediately (if the driver
1241 * processes the buffer at once), so we have to use
1242 * list_for_each_entry_safe() to handle the case where the object we
1243 * queue is deleted.
1244 */
1245 list_for_each_entry_safe(obj, obj_safe, &req->objects, list) {
1246 struct v4l2_m2m_ctx *m2m_ctx_obj;
1247 struct vb2_buffer *vb;
1248
1249 if (!obj->ops->queue)
1250 continue;
1251
1252 if (vb2_request_object_is_buffer(obj)) {
1253 /* Sanity checks */
1254 vb = container_of(obj, struct vb2_buffer, req_obj);
1255 WARN_ON(!V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type));
1256 m2m_ctx_obj = container_of(vb->vb2_queue,
1257 struct v4l2_m2m_ctx,
1258 out_q_ctx.q);
1259 WARN_ON(m2m_ctx && m2m_ctx_obj != m2m_ctx);
1260 m2m_ctx = m2m_ctx_obj;
1261 }
1262
1263 /*
1264 * The buffer we queue here can in theory be immediately
1265 * unbound, hence the use of list_for_each_entry_safe()
1266 * above and why we call the queue op last.
1267 */
1268 obj->ops->queue(obj);
1269 }
1270
1271 WARN_ON(!m2m_ctx);
1272
1273 if (m2m_ctx)
1274 v4l2_m2m_try_schedule(m2m_ctx);
1275}
1276EXPORT_SYMBOL_GPL(v4l2_m2m_request_queue);
1277
1278/* Videobuf2 ioctl helpers */
1279
1280int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
1281 struct v4l2_requestbuffers *rb)
1282{
1283 struct v4l2_fh *fh = file->private_data;
1284
1285 return v4l2_m2m_reqbufs(file, fh->m2m_ctx, rb);
1286}
1287EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_reqbufs);
1288
1289int v4l2_m2m_ioctl_create_bufs(struct file *file, void *priv,
1290 struct v4l2_create_buffers *create)
1291{
1292 struct v4l2_fh *fh = file->private_data;
1293
1294 return v4l2_m2m_create_bufs(file, fh->m2m_ctx, create);
1295}
1296EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_create_bufs);
1297
1298int v4l2_m2m_ioctl_querybuf(struct file *file, void *priv,
1299 struct v4l2_buffer *buf)
1300{
1301 struct v4l2_fh *fh = file->private_data;
1302
1303 return v4l2_m2m_querybuf(file, fh->m2m_ctx, buf);
1304}
1305EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_querybuf);
1306
1307int v4l2_m2m_ioctl_qbuf(struct file *file, void *priv,
1308 struct v4l2_buffer *buf)
1309{
1310 struct v4l2_fh *fh = file->private_data;
1311
1312 return v4l2_m2m_qbuf(file, fh->m2m_ctx, buf);
1313}
1314EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_qbuf);
1315
1316int v4l2_m2m_ioctl_dqbuf(struct file *file, void *priv,
1317 struct v4l2_buffer *buf)
1318{
1319 struct v4l2_fh *fh = file->private_data;
1320
1321 return v4l2_m2m_dqbuf(file, fh->m2m_ctx, buf);
1322}
1323EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_dqbuf);
1324
1325int v4l2_m2m_ioctl_prepare_buf(struct file *file, void *priv,
1326 struct v4l2_buffer *buf)
1327{
1328 struct v4l2_fh *fh = file->private_data;
1329
1330 return v4l2_m2m_prepare_buf(file, fh->m2m_ctx, buf);
1331}
1332EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_prepare_buf);
1333
1334int v4l2_m2m_ioctl_expbuf(struct file *file, void *priv,
1335 struct v4l2_exportbuffer *eb)
1336{
1337 struct v4l2_fh *fh = file->private_data;
1338
1339 return v4l2_m2m_expbuf(file, fh->m2m_ctx, eb);
1340}
1341EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_expbuf);
1342
1343int v4l2_m2m_ioctl_streamon(struct file *file, void *priv,
1344 enum v4l2_buf_type type)
1345{
1346 struct v4l2_fh *fh = file->private_data;
1347
1348 return v4l2_m2m_streamon(file, fh->m2m_ctx, type);
1349}
1350EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamon);
1351
1352int v4l2_m2m_ioctl_streamoff(struct file *file, void *priv,
1353 enum v4l2_buf_type type)
1354{
1355 struct v4l2_fh *fh = file->private_data;
1356
1357 return v4l2_m2m_streamoff(file, fh->m2m_ctx, type);
1358}
1359EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamoff);
1360
1361int v4l2_m2m_ioctl_try_encoder_cmd(struct file *file, void *fh,
1362 struct v4l2_encoder_cmd *ec)
1363{
1364 if (ec->cmd != V4L2_ENC_CMD_STOP && ec->cmd != V4L2_ENC_CMD_START)
1365 return -EINVAL;
1366
1367 ec->flags = 0;
1368 return 0;
1369}
1370EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_try_encoder_cmd);
1371
1372int v4l2_m2m_ioctl_try_decoder_cmd(struct file *file, void *fh,
1373 struct v4l2_decoder_cmd *dc)
1374{
1375 if (dc->cmd != V4L2_DEC_CMD_STOP && dc->cmd != V4L2_DEC_CMD_START)
1376 return -EINVAL;
1377
1378 dc->flags = 0;
1379
1380 if (dc->cmd == V4L2_DEC_CMD_STOP) {
1381 dc->stop.pts = 0;
1382 } else if (dc->cmd == V4L2_DEC_CMD_START) {
1383 dc->start.speed = 0;
1384 dc->start.format = V4L2_DEC_START_FMT_NONE;
1385 }
1386 return 0;
1387}
1388EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_try_decoder_cmd);
1389
1390/*
1391 * Updates the encoding state on ENC_CMD_STOP/ENC_CMD_START
1392 * Should be called from the encoder driver encoder_cmd() callback
1393 */
1394int v4l2_m2m_encoder_cmd(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
1395 struct v4l2_encoder_cmd *ec)
1396{
1397 if (ec->cmd != V4L2_ENC_CMD_STOP && ec->cmd != V4L2_ENC_CMD_START)
1398 return -EINVAL;
1399
1400 if (ec->cmd == V4L2_ENC_CMD_STOP)
1401 return v4l2_update_last_buf_state(m2m_ctx);
1402
1403 if (m2m_ctx->is_draining)
1404 return -EBUSY;
1405
1406 if (m2m_ctx->has_stopped)
1407 m2m_ctx->has_stopped = false;
1408
1409 return 0;
1410}
1411EXPORT_SYMBOL_GPL(v4l2_m2m_encoder_cmd);
1412
1413/*
1414 * Updates the decoding state on DEC_CMD_STOP/DEC_CMD_START
1415 * Should be called from the decoder driver decoder_cmd() callback
1416 */
1417int v4l2_m2m_decoder_cmd(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
1418 struct v4l2_decoder_cmd *dc)
1419{
1420 if (dc->cmd != V4L2_DEC_CMD_STOP && dc->cmd != V4L2_DEC_CMD_START)
1421 return -EINVAL;
1422
1423 if (dc->cmd == V4L2_DEC_CMD_STOP)
1424 return v4l2_update_last_buf_state(m2m_ctx);
1425
1426 if (m2m_ctx->is_draining)
1427 return -EBUSY;
1428
1429 if (m2m_ctx->has_stopped)
1430 m2m_ctx->has_stopped = false;
1431
1432 return 0;
1433}
1434EXPORT_SYMBOL_GPL(v4l2_m2m_decoder_cmd);
1435
1436int v4l2_m2m_ioctl_encoder_cmd(struct file *file, void *priv,
1437 struct v4l2_encoder_cmd *ec)
1438{
1439 struct v4l2_fh *fh = file->private_data;
1440
1441 return v4l2_m2m_encoder_cmd(file, fh->m2m_ctx, ec);
1442}
1443EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_encoder_cmd);
1444
1445int v4l2_m2m_ioctl_decoder_cmd(struct file *file, void *priv,
1446 struct v4l2_decoder_cmd *dc)
1447{
1448 struct v4l2_fh *fh = file->private_data;
1449
1450 return v4l2_m2m_decoder_cmd(file, fh->m2m_ctx, dc);
1451}
1452EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_decoder_cmd);
1453
1454int v4l2_m2m_ioctl_stateless_try_decoder_cmd(struct file *file, void *fh,
1455 struct v4l2_decoder_cmd *dc)
1456{
1457 if (dc->cmd != V4L2_DEC_CMD_FLUSH)
1458 return -EINVAL;
1459
1460 dc->flags = 0;
1461
1462 return 0;
1463}
1464EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_stateless_try_decoder_cmd);
1465
1466int v4l2_m2m_ioctl_stateless_decoder_cmd(struct file *file, void *priv,
1467 struct v4l2_decoder_cmd *dc)
1468{
1469 struct v4l2_fh *fh = file->private_data;
1470 struct vb2_v4l2_buffer *out_vb, *cap_vb;
1471 struct v4l2_m2m_dev *m2m_dev = fh->m2m_ctx->m2m_dev;
1472 unsigned long flags;
1473 int ret;
1474
1475 ret = v4l2_m2m_ioctl_stateless_try_decoder_cmd(file, priv, dc);
1476 if (ret < 0)
1477 return ret;
1478
1479 spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
1480 out_vb = v4l2_m2m_last_src_buf(fh->m2m_ctx);
1481 cap_vb = v4l2_m2m_last_dst_buf(fh->m2m_ctx);
1482
1483 /*
1484 * If there is an out buffer pending, then clear any HOLD flag.
1485 *
1486 * By clearing this flag we ensure that when this output
1487 * buffer is processed any held capture buffer will be released.
1488 */
1489 if (out_vb) {
1490 out_vb->flags &= ~V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
1491 } else if (cap_vb && cap_vb->is_held) {
1492 /*
1493 * If there were no output buffers, but there is a
1494 * capture buffer that is held, then release that
1495 * buffer.
1496 */
1497 cap_vb->is_held = false;
1498 v4l2_m2m_dst_buf_remove(fh->m2m_ctx);
1499 v4l2_m2m_buf_done(cap_vb, VB2_BUF_STATE_DONE);
1500 }
1501 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
1502
1503 return 0;
1504}
1505EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_stateless_decoder_cmd);
1506
1507/*
1508 * v4l2_file_operations helpers. It is assumed here same lock is used
1509 * for the output and the capture buffer queue.
1510 */
1511
1512int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma)
1513{
1514 struct v4l2_fh *fh = file->private_data;
1515
1516 return v4l2_m2m_mmap(file, fh->m2m_ctx, vma);
1517}
1518EXPORT_SYMBOL_GPL(v4l2_m2m_fop_mmap);
1519
1520__poll_t v4l2_m2m_fop_poll(struct file *file, poll_table *wait)
1521{
1522 struct v4l2_fh *fh = file->private_data;
1523 struct v4l2_m2m_ctx *m2m_ctx = fh->m2m_ctx;
1524 __poll_t ret;
1525
1526 if (m2m_ctx->q_lock)
1527 mutex_lock(m2m_ctx->q_lock);
1528
1529 ret = v4l2_m2m_poll(file, m2m_ctx, wait);
1530
1531 if (m2m_ctx->q_lock)
1532 mutex_unlock(m2m_ctx->q_lock);
1533
1534 return ret;
1535}
1536EXPORT_SYMBOL_GPL(v4l2_m2m_fop_poll);
1537