1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Memory-to-memory device framework for Video for Linux 2.
5 * Helper functions for devices that use memory buffers for both source
8 * Copyright (c) 2009 Samsung Electronics Co., Ltd.
9 * Pawel Osciak, <pawel@osciak.com>
10 * Marek Szyprowski, <m.szyprowski@samsung.com>
13 #ifndef _MEDIA_V4L2_MEM2MEM_H
14 #define _MEDIA_V4L2_MEM2MEM_H
16 #include <media/videobuf2-v4l2.h>
19 * struct v4l2_m2m_ops - mem-to-mem device driver callbacks
20 * @device_run: required. Begin the actual job (transaction) inside this
22 * The job does NOT have to end before this callback returns
23 * (and it will be the usual case). When the job finishes,
24 * v4l2_m2m_job_finish() or v4l2_m2m_buf_done_and_job_finish()
26 * @job_ready: optional. Should return 0 if the driver does not have a job
27 * fully prepared to run yet (i.e. it will not be able to finish a
28 * transaction without sleeping). If not provided, it will be
29 * assumed that one source and one destination buffer are all
30 * that is required for the driver to perform one full transaction.
31 * This method may not sleep.
32 * @job_abort: optional. Informs the driver that it has to abort the currently
33 * running transaction as soon as possible (i.e. as soon as it can
34 * stop the device safely; e.g. in the next interrupt handler),
35 * even if the transaction would not have been finished by then.
36 * After the driver performs the necessary steps, it has to call
37 * v4l2_m2m_job_finish() or v4l2_m2m_buf_done_and_job_finish() as
38 * if the transaction ended normally.
39 * This function does not have to (and will usually not) wait
40 * until the device enters a state when it can be stopped.
43 void (*device_run)(void *priv);
44 int (*job_ready)(void *priv);
45 void (*job_abort)(void *priv);
52 * struct v4l2_m2m_queue_ctx - represents a queue for buffers ready to be
55 * @q: pointer to struct &vb2_queue
56 * @rdy_queue: List of V4L2 mem-to-mem queues
57 * @rdy_spinlock: spin lock to protect the struct usage
58 * @num_rdy: number of buffers ready to be processed
59 * @buffered: is the queue buffered?
61 * Queue for buffers ready to be processed as soon as this
62 * instance receives access to the device.
65 struct v4l2_m2m_queue_ctx {
68 struct list_head rdy_queue;
69 spinlock_t rdy_spinlock;
75 * struct v4l2_m2m_ctx - Memory to memory context structure
77 * @q_lock: struct &mutex lock
78 * @new_frame: valid in the device_run callback: if true, then this
79 * starts a new frame; if false, then this is a new slice
80 * for an existing frame. This is always true unless
81 * V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF is set, which
82 * indicates slicing support.
83 * @is_draining: indicates device is in draining phase
84 * @last_src_buf: indicate the last source buffer for draining
85 * @next_buf_last: next capture queud buffer will be tagged as last
86 * @has_stopped: indicate the device has been stopped
87 * @m2m_dev: opaque pointer to the internal data to handle M2M context
88 * @cap_q_ctx: Capture (output to memory) queue context
89 * @out_q_ctx: Output (input from memory) queue context
90 * @queue: List of memory to memory contexts
91 * @job_flags: Job queue flags, used internally by v4l2-mem2mem.c:
92 * %TRANS_QUEUED, %TRANS_RUNNING and %TRANS_ABORT.
93 * @finished: Wait queue used to signalize when a job queue finished.
94 * @priv: Instance private data
96 * The memory to memory context is specific to a file handle, NOT to e.g.
100 /* optional cap/out vb2 queues lock */
101 struct mutex *q_lock;
106 struct vb2_v4l2_buffer *last_src_buf;
110 /* internal use only */
111 struct v4l2_m2m_dev *m2m_dev;
113 struct v4l2_m2m_queue_ctx cap_q_ctx;
115 struct v4l2_m2m_queue_ctx out_q_ctx;
117 /* For device job queue */
118 struct list_head queue;
119 unsigned long job_flags;
120 wait_queue_head_t finished;
126 * struct v4l2_m2m_buffer - Memory to memory buffer
128 * @vb: pointer to struct &vb2_v4l2_buffer
129 * @list: list of m2m buffers
131 struct v4l2_m2m_buffer {
132 struct vb2_v4l2_buffer vb;
133 struct list_head list;
137 * v4l2_m2m_get_curr_priv() - return driver private data for the currently
138 * running instance or NULL if no instance is running
140 * @m2m_dev: opaque pointer to the internal data to handle M2M context
142 void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev);
145 * v4l2_m2m_get_vq() - return vb2_queue for the given type
147 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
148 * @type: type of the V4L2 buffer, as defined by enum &v4l2_buf_type
150 struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
151 enum v4l2_buf_type type);
154 * v4l2_m2m_try_schedule() - check whether an instance is ready to be added to
155 * the pending job queue and add it if so.
157 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
159 * There are three basic requirements an instance has to meet to be able to run:
160 * 1) at least one source buffer has to be queued,
161 * 2) at least one destination buffer has to be queued,
162 * 3) streaming has to be on.
164 * If a queue is buffered (for example a decoder hardware ringbuffer that has
165 * to be drained before doing streamoff), allow scheduling without v4l2 buffers
168 * There may also be additional, custom requirements. In such case the driver
169 * should supply a custom callback (job_ready in v4l2_m2m_ops) that should
170 * return 1 if the instance is ready.
171 * An example of the above could be an instance that requires more than one
172 * src/dst buffer per transaction.
174 void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx);
177 * v4l2_m2m_job_finish() - inform the framework that a job has been finished
178 * and have it clean up
180 * @m2m_dev: opaque pointer to the internal data to handle M2M context
181 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
183 * Called by a driver to yield back the device after it has finished with it.
184 * Should be called as soon as possible after reaching a state which allows
185 * other instances to take control of the device.
187 * This function has to be called only after &v4l2_m2m_ops->device_run
188 * callback has been called on the driver. To prevent recursion, it should
189 * not be called directly from the &v4l2_m2m_ops->device_run callback though.
191 void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
192 struct v4l2_m2m_ctx *m2m_ctx);
195 * v4l2_m2m_buf_done_and_job_finish() - return source/destination buffers with
196 * state and inform the framework that a job has been finished and have it
199 * @m2m_dev: opaque pointer to the internal data to handle M2M context
200 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
201 * @state: vb2 buffer state passed to v4l2_m2m_buf_done().
203 * Drivers that set V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF must use this
204 * function instead of job_finish() to take held buffers into account. It is
205 * optional for other drivers.
207 * This function removes the source buffer from the ready list and returns
208 * it with the given state. The same is done for the destination buffer, unless
209 * it is marked 'held'. In that case the buffer is kept on the ready list.
211 * After that the job is finished (see job_finish()).
213 * This allows for multiple output buffers to be used to fill in a single
214 * capture buffer. This is typically used by stateless decoders where
215 * multiple e.g. H.264 slices contribute to a single decoded frame.
217 void v4l2_m2m_buf_done_and_job_finish(struct v4l2_m2m_dev *m2m_dev,
218 struct v4l2_m2m_ctx *m2m_ctx,
219 enum vb2_buffer_state state);
222 v4l2_m2m_buf_done(struct vb2_v4l2_buffer *buf, enum vb2_buffer_state state)
224 vb2_buffer_done(&buf->vb2_buf, state);
228 * v4l2_m2m_clear_state() - clear encoding/decoding state
230 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
233 v4l2_m2m_clear_state(struct v4l2_m2m_ctx *m2m_ctx)
235 m2m_ctx->next_buf_last = false;
236 m2m_ctx->is_draining = false;
237 m2m_ctx->has_stopped = false;
241 * v4l2_m2m_mark_stopped() - set current encoding/decoding state as stopped
243 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
246 v4l2_m2m_mark_stopped(struct v4l2_m2m_ctx *m2m_ctx)
248 m2m_ctx->next_buf_last = false;
249 m2m_ctx->is_draining = false;
250 m2m_ctx->has_stopped = true;
254 * v4l2_m2m_dst_buf_is_last() - return the current encoding/decoding session
255 * draining management state of next queued capture buffer
257 * This last capture buffer should be tagged with V4L2_BUF_FLAG_LAST to notify
258 * the end of the capture session.
260 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
263 v4l2_m2m_dst_buf_is_last(struct v4l2_m2m_ctx *m2m_ctx)
265 return m2m_ctx->is_draining && m2m_ctx->next_buf_last;
269 * v4l2_m2m_has_stopped() - return the current encoding/decoding session
272 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
275 v4l2_m2m_has_stopped(struct v4l2_m2m_ctx *m2m_ctx)
277 return m2m_ctx->has_stopped;
281 * v4l2_m2m_is_last_draining_src_buf() - return the output buffer draining
282 * state in the current encoding/decoding session
284 * This will identify the last output buffer queued before a session stop
285 * was required, leading to an actual encoding/decoding session stop state
286 * in the encoding/decoding process after being processed.
288 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
289 * @vbuf: pointer to struct &v4l2_buffer
292 v4l2_m2m_is_last_draining_src_buf(struct v4l2_m2m_ctx *m2m_ctx,
293 struct vb2_v4l2_buffer *vbuf)
295 return m2m_ctx->is_draining && vbuf == m2m_ctx->last_src_buf;
299 * v4l2_m2m_last_buffer_done() - marks the buffer with LAST flag and DONE
301 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
302 * @vbuf: pointer to struct &v4l2_buffer
304 void v4l2_m2m_last_buffer_done(struct v4l2_m2m_ctx *m2m_ctx,
305 struct vb2_v4l2_buffer *vbuf);
308 * v4l2_m2m_suspend() - stop new jobs from being run and wait for current job
311 * @m2m_dev: opaque pointer to the internal data to handle M2M context
313 * Called by a driver in the suspend hook. Stop new jobs from being run, and
314 * wait for current running job to finish.
316 void v4l2_m2m_suspend(struct v4l2_m2m_dev *m2m_dev);
319 * v4l2_m2m_resume() - resume job running and try to run a queued job
321 * @m2m_dev: opaque pointer to the internal data to handle M2M context
323 * Called by a driver in the resume hook. This reverts the operation of
324 * v4l2_m2m_suspend() and allows job to be run. Also try to run a queued job if
327 void v4l2_m2m_resume(struct v4l2_m2m_dev *m2m_dev);
330 * v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer
332 * @file: pointer to struct &file
333 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
334 * @reqbufs: pointer to struct &v4l2_requestbuffers
336 int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
337 struct v4l2_requestbuffers *reqbufs);
340 * v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer
342 * @file: pointer to struct &file
343 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
344 * @buf: pointer to struct &v4l2_buffer
346 * See v4l2_m2m_mmap() documentation for details.
348 int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
349 struct v4l2_buffer *buf);
352 * v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on
355 * @file: pointer to struct &file
356 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
357 * @buf: pointer to struct &v4l2_buffer
359 int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
360 struct v4l2_buffer *buf);
363 * v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on
366 * @file: pointer to struct &file
367 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
368 * @buf: pointer to struct &v4l2_buffer
370 int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
371 struct v4l2_buffer *buf);
374 * v4l2_m2m_prepare_buf() - prepare a source or destination buffer, depending on
377 * @file: pointer to struct &file
378 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
379 * @buf: pointer to struct &v4l2_buffer
381 int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
382 struct v4l2_buffer *buf);
385 * v4l2_m2m_create_bufs() - create a source or destination buffer, depending
388 * @file: pointer to struct &file
389 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
390 * @create: pointer to struct &v4l2_create_buffers
392 int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
393 struct v4l2_create_buffers *create);
396 * v4l2_m2m_expbuf() - export a source or destination buffer, depending on
399 * @file: pointer to struct &file
400 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
401 * @eb: pointer to struct &v4l2_exportbuffer
403 int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
404 struct v4l2_exportbuffer *eb);
407 * v4l2_m2m_streamon() - turn on streaming for a video queue
409 * @file: pointer to struct &file
410 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
411 * @type: type of the V4L2 buffer, as defined by enum &v4l2_buf_type
413 int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
414 enum v4l2_buf_type type);
417 * v4l2_m2m_streamoff() - turn off streaming for a video queue
419 * @file: pointer to struct &file
420 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
421 * @type: type of the V4L2 buffer, as defined by enum &v4l2_buf_type
423 int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
424 enum v4l2_buf_type type);
427 * v4l2_m2m_update_start_streaming_state() - update the encoding/decoding
428 * session state when a start of streaming of a video queue is requested
430 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
433 void v4l2_m2m_update_start_streaming_state(struct v4l2_m2m_ctx *m2m_ctx,
434 struct vb2_queue *q);
437 * v4l2_m2m_update_stop_streaming_state() - update the encoding/decoding
438 * session state when a stop of streaming of a video queue is requested
440 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
443 void v4l2_m2m_update_stop_streaming_state(struct v4l2_m2m_ctx *m2m_ctx,
444 struct vb2_queue *q);
447 * v4l2_m2m_encoder_cmd() - execute an encoder command
449 * @file: pointer to struct &file
450 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
451 * @ec: pointer to the encoder command
453 int v4l2_m2m_encoder_cmd(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
454 struct v4l2_encoder_cmd *ec);
457 * v4l2_m2m_decoder_cmd() - execute a decoder command
459 * @file: pointer to struct &file
460 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
461 * @dc: pointer to the decoder command
463 int v4l2_m2m_decoder_cmd(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
464 struct v4l2_decoder_cmd *dc);
467 * v4l2_m2m_poll() - poll replacement, for destination buffers only
469 * @file: pointer to struct &file
470 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
471 * @wait: pointer to struct &poll_table_struct
473 * Call from the driver's poll() function. Will poll both queues. If a buffer
474 * is available to dequeue (with dqbuf) from the source queue, this will
475 * indicate that a non-blocking write can be performed, while read will be
476 * returned in case of the destination queue.
478 __poll_t v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
479 struct poll_table_struct *wait);
482 * v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer
484 * @file: pointer to struct &file
485 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
486 * @vma: pointer to struct &vm_area_struct
488 * Call from driver's mmap() function. Will handle mmap() for both queues
489 * seamlessly for videobuffer, which will receive normal per-queue offsets and
490 * proper videobuf queue pointers. The differentiation is made outside videobuf
491 * by adding a predefined offset to buffers from one of the queues and
492 * subtracting it before passing it back to videobuf. Only drivers (and
493 * thus applications) receive modified offsets.
495 int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
496 struct vm_area_struct *vma);
499 unsigned long v4l2_m2m_get_unmapped_area(struct file *file, unsigned long addr,
500 unsigned long len, unsigned long pgoff,
501 unsigned long flags);
504 * v4l2_m2m_init() - initialize per-driver m2m data
506 * @m2m_ops: pointer to struct v4l2_m2m_ops
508 * Usually called from driver's ``probe()`` function.
510 * Return: returns an opaque pointer to the internal data to handle M2M context
512 struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops);
514 #if defined(CONFIG_MEDIA_CONTROLLER)
515 void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev);
516 int v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
517 struct video_device *vdev, int function);
520 v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev)
525 v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
526 struct video_device *vdev, int function)
533 * v4l2_m2m_release() - cleans up and frees a m2m_dev structure
535 * @m2m_dev: opaque pointer to the internal data to handle M2M context
537 * Usually called from driver's ``remove()`` function.
539 void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev);
542 * v4l2_m2m_ctx_init() - allocate and initialize a m2m context
544 * @m2m_dev: opaque pointer to the internal data to handle M2M context
545 * @drv_priv: driver's instance private data
546 * @queue_init: a callback for queue type-specific initialization function
547 * to be used for initializing videobuf_queues
549 * Usually called from driver's ``open()`` function.
551 struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
553 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq));
555 static inline void v4l2_m2m_set_src_buffered(struct v4l2_m2m_ctx *m2m_ctx,
558 m2m_ctx->out_q_ctx.buffered = buffered;
561 static inline void v4l2_m2m_set_dst_buffered(struct v4l2_m2m_ctx *m2m_ctx,
564 m2m_ctx->cap_q_ctx.buffered = buffered;
568 * v4l2_m2m_ctx_release() - release m2m context
570 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
572 * Usually called from driver's release() function.
574 void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx);
577 * v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list.
579 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
580 * @vbuf: pointer to struct &vb2_v4l2_buffer
582 * Call from videobuf_queue_ops->ops->buf_queue, videobuf_queue_ops callback.
584 void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
585 struct vb2_v4l2_buffer *vbuf);
588 * v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for
591 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
594 unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
596 return m2m_ctx->out_q_ctx.num_rdy;
600 * v4l2_m2m_num_dst_bufs_ready() - return the number of destination buffers
603 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
606 unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
608 return m2m_ctx->cap_q_ctx.num_rdy;
612 * v4l2_m2m_next_buf() - return next buffer from the list of ready buffers
614 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
616 struct vb2_v4l2_buffer *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx);
619 * v4l2_m2m_next_src_buf() - return next source buffer from the list of ready
622 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
624 static inline struct vb2_v4l2_buffer *
625 v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
627 return v4l2_m2m_next_buf(&m2m_ctx->out_q_ctx);
631 * v4l2_m2m_next_dst_buf() - return next destination buffer from the list of
634 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
636 static inline struct vb2_v4l2_buffer *
637 v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
639 return v4l2_m2m_next_buf(&m2m_ctx->cap_q_ctx);
643 * v4l2_m2m_last_buf() - return last buffer from the list of ready buffers
645 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
647 struct vb2_v4l2_buffer *v4l2_m2m_last_buf(struct v4l2_m2m_queue_ctx *q_ctx);
650 * v4l2_m2m_last_src_buf() - return last destination buffer from the list of
653 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
655 static inline struct vb2_v4l2_buffer *
656 v4l2_m2m_last_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
658 return v4l2_m2m_last_buf(&m2m_ctx->out_q_ctx);
662 * v4l2_m2m_last_dst_buf() - return last destination buffer from the list of
665 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
667 static inline struct vb2_v4l2_buffer *
668 v4l2_m2m_last_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
670 return v4l2_m2m_last_buf(&m2m_ctx->cap_q_ctx);
674 * v4l2_m2m_for_each_dst_buf() - iterate over a list of destination ready
677 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
678 * @b: current buffer of type struct v4l2_m2m_buffer
680 #define v4l2_m2m_for_each_dst_buf(m2m_ctx, b) \
681 list_for_each_entry(b, &m2m_ctx->cap_q_ctx.rdy_queue, list)
684 * v4l2_m2m_for_each_src_buf() - iterate over a list of source ready buffers
686 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
687 * @b: current buffer of type struct v4l2_m2m_buffer
689 #define v4l2_m2m_for_each_src_buf(m2m_ctx, b) \
690 list_for_each_entry(b, &m2m_ctx->out_q_ctx.rdy_queue, list)
693 * v4l2_m2m_for_each_dst_buf_safe() - iterate over a list of destination ready
696 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
697 * @b: current buffer of type struct v4l2_m2m_buffer
698 * @n: used as temporary storage
700 #define v4l2_m2m_for_each_dst_buf_safe(m2m_ctx, b, n) \
701 list_for_each_entry_safe(b, n, &m2m_ctx->cap_q_ctx.rdy_queue, list)
704 * v4l2_m2m_for_each_src_buf_safe() - iterate over a list of source ready
707 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
708 * @b: current buffer of type struct v4l2_m2m_buffer
709 * @n: used as temporary storage
711 #define v4l2_m2m_for_each_src_buf_safe(m2m_ctx, b, n) \
712 list_for_each_entry_safe(b, n, &m2m_ctx->out_q_ctx.rdy_queue, list)
715 * v4l2_m2m_get_src_vq() - return vb2_queue for source buffers
717 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
720 struct vb2_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx)
722 return &m2m_ctx->out_q_ctx.q;
726 * v4l2_m2m_get_dst_vq() - return vb2_queue for destination buffers
728 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
731 struct vb2_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx)
733 return &m2m_ctx->cap_q_ctx.q;
737 * v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and
740 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
742 struct vb2_v4l2_buffer *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx);
745 * v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready
746 * buffers and return it
748 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
750 static inline struct vb2_v4l2_buffer *
751 v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
753 return v4l2_m2m_buf_remove(&m2m_ctx->out_q_ctx);
757 * v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of
758 * ready buffers and return it
760 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
762 static inline struct vb2_v4l2_buffer *
763 v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
765 return v4l2_m2m_buf_remove(&m2m_ctx->cap_q_ctx);
769 * v4l2_m2m_buf_remove_by_buf() - take off exact buffer from the list of ready
772 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
773 * @vbuf: the buffer to be removed
775 void v4l2_m2m_buf_remove_by_buf(struct v4l2_m2m_queue_ctx *q_ctx,
776 struct vb2_v4l2_buffer *vbuf);
779 * v4l2_m2m_src_buf_remove_by_buf() - take off exact source buffer from the list
782 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
783 * @vbuf: the buffer to be removed
785 static inline void v4l2_m2m_src_buf_remove_by_buf(struct v4l2_m2m_ctx *m2m_ctx,
786 struct vb2_v4l2_buffer *vbuf)
788 v4l2_m2m_buf_remove_by_buf(&m2m_ctx->out_q_ctx, vbuf);
792 * v4l2_m2m_dst_buf_remove_by_buf() - take off exact destination buffer from the
793 * list of ready buffers
795 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
796 * @vbuf: the buffer to be removed
798 static inline void v4l2_m2m_dst_buf_remove_by_buf(struct v4l2_m2m_ctx *m2m_ctx,
799 struct vb2_v4l2_buffer *vbuf)
801 v4l2_m2m_buf_remove_by_buf(&m2m_ctx->cap_q_ctx, vbuf);
804 struct vb2_v4l2_buffer *
805 v4l2_m2m_buf_remove_by_idx(struct v4l2_m2m_queue_ctx *q_ctx, unsigned int idx);
807 static inline struct vb2_v4l2_buffer *
808 v4l2_m2m_src_buf_remove_by_idx(struct v4l2_m2m_ctx *m2m_ctx, unsigned int idx)
810 return v4l2_m2m_buf_remove_by_idx(&m2m_ctx->out_q_ctx, idx);
813 static inline struct vb2_v4l2_buffer *
814 v4l2_m2m_dst_buf_remove_by_idx(struct v4l2_m2m_ctx *m2m_ctx, unsigned int idx)
816 return v4l2_m2m_buf_remove_by_idx(&m2m_ctx->cap_q_ctx, idx);
820 * v4l2_m2m_buf_copy_metadata() - copy buffer metadata from
821 * the output buffer to the capture buffer
823 * @out_vb: the output buffer that is the source of the metadata.
824 * @cap_vb: the capture buffer that will receive the metadata.
825 * @copy_frame_flags: copy the KEY/B/PFRAME flags as well.
827 * This helper function copies the timestamp, timecode (if the TIMECODE
828 * buffer flag was set), field and the TIMECODE, KEYFRAME, BFRAME, PFRAME
829 * and TSTAMP_SRC_MASK flags from @out_vb to @cap_vb.
831 * If @copy_frame_flags is false, then the KEYFRAME, BFRAME and PFRAME
832 * flags are not copied. This is typically needed for encoders that
833 * set this bits explicitly.
835 void v4l2_m2m_buf_copy_metadata(const struct vb2_v4l2_buffer *out_vb,
836 struct vb2_v4l2_buffer *cap_vb,
837 bool copy_frame_flags);
839 /* v4l2 request helper */
841 void v4l2_m2m_request_queue(struct media_request *req);
843 /* v4l2 ioctl helpers */
845 int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
846 struct v4l2_requestbuffers *rb);
847 int v4l2_m2m_ioctl_create_bufs(struct file *file, void *fh,
848 struct v4l2_create_buffers *create);
849 int v4l2_m2m_ioctl_querybuf(struct file *file, void *fh,
850 struct v4l2_buffer *buf);
851 int v4l2_m2m_ioctl_expbuf(struct file *file, void *fh,
852 struct v4l2_exportbuffer *eb);
853 int v4l2_m2m_ioctl_qbuf(struct file *file, void *fh,
854 struct v4l2_buffer *buf);
855 int v4l2_m2m_ioctl_dqbuf(struct file *file, void *fh,
856 struct v4l2_buffer *buf);
857 int v4l2_m2m_ioctl_prepare_buf(struct file *file, void *fh,
858 struct v4l2_buffer *buf);
859 int v4l2_m2m_ioctl_streamon(struct file *file, void *fh,
860 enum v4l2_buf_type type);
861 int v4l2_m2m_ioctl_streamoff(struct file *file, void *fh,
862 enum v4l2_buf_type type);
863 int v4l2_m2m_ioctl_encoder_cmd(struct file *file, void *fh,
864 struct v4l2_encoder_cmd *ec);
865 int v4l2_m2m_ioctl_decoder_cmd(struct file *file, void *fh,
866 struct v4l2_decoder_cmd *dc);
867 int v4l2_m2m_ioctl_try_encoder_cmd(struct file *file, void *fh,
868 struct v4l2_encoder_cmd *ec);
869 int v4l2_m2m_ioctl_try_decoder_cmd(struct file *file, void *fh,
870 struct v4l2_decoder_cmd *dc);
871 int v4l2_m2m_ioctl_stateless_try_decoder_cmd(struct file *file, void *fh,
872 struct v4l2_decoder_cmd *dc);
873 int v4l2_m2m_ioctl_stateless_decoder_cmd(struct file *file, void *priv,
874 struct v4l2_decoder_cmd *dc);
875 int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma);
876 __poll_t v4l2_m2m_fop_poll(struct file *file, poll_table *wait);
878 #endif /* _MEDIA_V4L2_MEM2MEM_H */