Loading...
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Memory-to-memory device framework for Video for Linux 2.
4 *
5 * Helper functions for devices that use memory buffers for both source
6 * and destination.
7 *
8 * Copyright (c) 2009 Samsung Electronics Co., Ltd.
9 * Pawel Osciak, <pawel@osciak.com>
10 * Marek Szyprowski, <m.szyprowski@samsung.com>
11 */
12
13#ifndef _MEDIA_V4L2_MEM2MEM_H
14#define _MEDIA_V4L2_MEM2MEM_H
15
16#include <media/videobuf2-v4l2.h>
17
18/**
19 * struct v4l2_m2m_ops - mem-to-mem device driver callbacks
20 * @device_run: required. Begin the actual job (transaction) inside this
21 * callback.
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()
25 * has to be called.
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.
41 */
42struct v4l2_m2m_ops {
43 void (*device_run)(void *priv);
44 int (*job_ready)(void *priv);
45 void (*job_abort)(void *priv);
46};
47
48struct video_device;
49struct v4l2_m2m_dev;
50
51/**
52 * struct v4l2_m2m_queue_ctx - represents a queue for buffers ready to be
53 * processed
54 *
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?
60 *
61 * Queue for buffers ready to be processed as soon as this
62 * instance receives access to the device.
63 */
64
65struct v4l2_m2m_queue_ctx {
66 struct vb2_queue q;
67
68 struct list_head rdy_queue;
69 spinlock_t rdy_spinlock;
70 u8 num_rdy;
71 bool buffered;
72};
73
74/**
75 * struct v4l2_m2m_ctx - Memory to memory context structure
76 *
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
95 *
96 * The memory to memory context is specific to a file handle, NOT to e.g.
97 * a device.
98 */
99struct v4l2_m2m_ctx {
100 /* optional cap/out vb2 queues lock */
101 struct mutex *q_lock;
102
103 bool new_frame;
104
105 bool is_draining;
106 struct vb2_v4l2_buffer *last_src_buf;
107 bool next_buf_last;
108 bool has_stopped;
109
110 /* internal use only */
111 struct v4l2_m2m_dev *m2m_dev;
112
113 struct v4l2_m2m_queue_ctx cap_q_ctx;
114
115 struct v4l2_m2m_queue_ctx out_q_ctx;
116
117 /* For device job queue */
118 struct list_head queue;
119 unsigned long job_flags;
120 wait_queue_head_t finished;
121
122 void *priv;
123};
124
125/**
126 * struct v4l2_m2m_buffer - Memory to memory buffer
127 *
128 * @vb: pointer to struct &vb2_v4l2_buffer
129 * @list: list of m2m buffers
130 */
131struct v4l2_m2m_buffer {
132 struct vb2_v4l2_buffer vb;
133 struct list_head list;
134};
135
136/**
137 * v4l2_m2m_get_curr_priv() - return driver private data for the currently
138 * running instance or NULL if no instance is running
139 *
140 * @m2m_dev: opaque pointer to the internal data to handle M2M context
141 */
142void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev);
143
144/**
145 * v4l2_m2m_get_vq() - return vb2_queue for the given type
146 *
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
149 */
150struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
151 enum v4l2_buf_type type);
152
153/**
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.
156 *
157 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
158 *
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.
163 *
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
166 * on that queue.
167 *
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.
173 */
174void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx);
175
176/**
177 * v4l2_m2m_job_finish() - inform the framework that a job has been finished
178 * and have it clean up
179 *
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
182 *
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.
186 *
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.
190 */
191void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
192 struct v4l2_m2m_ctx *m2m_ctx);
193
194/**
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
197 * clean up
198 *
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().
202 *
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.
206 *
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.
210 *
211 * After that the job is finished (see job_finish()).
212 *
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.
216 */
217void 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);
220
221static inline void
222v4l2_m2m_buf_done(struct vb2_v4l2_buffer *buf, enum vb2_buffer_state state)
223{
224 vb2_buffer_done(&buf->vb2_buf, state);
225}
226
227/**
228 * v4l2_m2m_clear_state() - clear encoding/decoding state
229 *
230 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
231 */
232static inline void
233v4l2_m2m_clear_state(struct v4l2_m2m_ctx *m2m_ctx)
234{
235 m2m_ctx->next_buf_last = false;
236 m2m_ctx->is_draining = false;
237 m2m_ctx->has_stopped = false;
238}
239
240/**
241 * v4l2_m2m_mark_stopped() - set current encoding/decoding state as stopped
242 *
243 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
244 */
245static inline void
246v4l2_m2m_mark_stopped(struct v4l2_m2m_ctx *m2m_ctx)
247{
248 m2m_ctx->next_buf_last = false;
249 m2m_ctx->is_draining = false;
250 m2m_ctx->has_stopped = true;
251}
252
253/**
254 * v4l2_m2m_dst_buf_is_last() - return the current encoding/decoding session
255 * draining management state of next queued capture buffer
256 *
257 * This last capture buffer should be tagged with V4L2_BUF_FLAG_LAST to notify
258 * the end of the capture session.
259 *
260 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
261 */
262static inline bool
263v4l2_m2m_dst_buf_is_last(struct v4l2_m2m_ctx *m2m_ctx)
264{
265 return m2m_ctx->is_draining && m2m_ctx->next_buf_last;
266}
267
268/**
269 * v4l2_m2m_has_stopped() - return the current encoding/decoding session
270 * stopped state
271 *
272 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
273 */
274static inline bool
275v4l2_m2m_has_stopped(struct v4l2_m2m_ctx *m2m_ctx)
276{
277 return m2m_ctx->has_stopped;
278}
279
280/**
281 * v4l2_m2m_is_last_draining_src_buf() - return the output buffer draining
282 * state in the current encoding/decoding session
283 *
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.
287 *
288 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
289 * @vbuf: pointer to struct &v4l2_buffer
290 */
291static inline bool
292v4l2_m2m_is_last_draining_src_buf(struct v4l2_m2m_ctx *m2m_ctx,
293 struct vb2_v4l2_buffer *vbuf)
294{
295 return m2m_ctx->is_draining && vbuf == m2m_ctx->last_src_buf;
296}
297
298/**
299 * v4l2_m2m_last_buffer_done() - marks the buffer with LAST flag and DONE
300 *
301 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
302 * @vbuf: pointer to struct &v4l2_buffer
303 */
304void v4l2_m2m_last_buffer_done(struct v4l2_m2m_ctx *m2m_ctx,
305 struct vb2_v4l2_buffer *vbuf);
306
307/**
308 * v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer
309 *
310 * @file: pointer to struct &file
311 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
312 * @reqbufs: pointer to struct &v4l2_requestbuffers
313 */
314int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
315 struct v4l2_requestbuffers *reqbufs);
316
317/**
318 * v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer
319 *
320 * @file: pointer to struct &file
321 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
322 * @buf: pointer to struct &v4l2_buffer
323 *
324 * See v4l2_m2m_mmap() documentation for details.
325 */
326int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
327 struct v4l2_buffer *buf);
328
329/**
330 * v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on
331 * the type
332 *
333 * @file: pointer to struct &file
334 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
335 * @buf: pointer to struct &v4l2_buffer
336 */
337int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
338 struct v4l2_buffer *buf);
339
340/**
341 * v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on
342 * the type
343 *
344 * @file: pointer to struct &file
345 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
346 * @buf: pointer to struct &v4l2_buffer
347 */
348int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
349 struct v4l2_buffer *buf);
350
351/**
352 * v4l2_m2m_prepare_buf() - prepare a source or destination buffer, depending on
353 * the type
354 *
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
358 */
359int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
360 struct v4l2_buffer *buf);
361
362/**
363 * v4l2_m2m_create_bufs() - create a source or destination buffer, depending
364 * on the type
365 *
366 * @file: pointer to struct &file
367 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
368 * @create: pointer to struct &v4l2_create_buffers
369 */
370int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
371 struct v4l2_create_buffers *create);
372
373/**
374 * v4l2_m2m_expbuf() - export a source or destination buffer, depending on
375 * the type
376 *
377 * @file: pointer to struct &file
378 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
379 * @eb: pointer to struct &v4l2_exportbuffer
380 */
381int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
382 struct v4l2_exportbuffer *eb);
383
384/**
385 * v4l2_m2m_streamon() - turn on streaming for a video queue
386 *
387 * @file: pointer to struct &file
388 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
389 * @type: type of the V4L2 buffer, as defined by enum &v4l2_buf_type
390 */
391int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
392 enum v4l2_buf_type type);
393
394/**
395 * v4l2_m2m_streamoff() - turn off streaming for a video queue
396 *
397 * @file: pointer to struct &file
398 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
399 * @type: type of the V4L2 buffer, as defined by enum &v4l2_buf_type
400 */
401int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
402 enum v4l2_buf_type type);
403
404/**
405 * v4l2_m2m_update_start_streaming_state() - update the encoding/decoding
406 * session state when a start of streaming of a video queue is requested
407 *
408 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
409 * @q: queue
410 */
411void v4l2_m2m_update_start_streaming_state(struct v4l2_m2m_ctx *m2m_ctx,
412 struct vb2_queue *q);
413
414/**
415 * v4l2_m2m_update_stop_streaming_state() - update the encoding/decoding
416 * session state when a stop of streaming of a video queue is requested
417 *
418 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
419 * @q: queue
420 */
421void v4l2_m2m_update_stop_streaming_state(struct v4l2_m2m_ctx *m2m_ctx,
422 struct vb2_queue *q);
423
424/**
425 * v4l2_m2m_encoder_cmd() - execute an encoder command
426 *
427 * @file: pointer to struct &file
428 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
429 * @ec: pointer to the encoder command
430 */
431int v4l2_m2m_encoder_cmd(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
432 struct v4l2_encoder_cmd *ec);
433
434/**
435 * v4l2_m2m_decoder_cmd() - execute a decoder command
436 *
437 * @file: pointer to struct &file
438 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
439 * @dc: pointer to the decoder command
440 */
441int v4l2_m2m_decoder_cmd(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
442 struct v4l2_decoder_cmd *dc);
443
444/**
445 * v4l2_m2m_poll() - poll replacement, for destination buffers only
446 *
447 * @file: pointer to struct &file
448 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
449 * @wait: pointer to struct &poll_table_struct
450 *
451 * Call from the driver's poll() function. Will poll both queues. If a buffer
452 * is available to dequeue (with dqbuf) from the source queue, this will
453 * indicate that a non-blocking write can be performed, while read will be
454 * returned in case of the destination queue.
455 */
456__poll_t v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
457 struct poll_table_struct *wait);
458
459/**
460 * v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer
461 *
462 * @file: pointer to struct &file
463 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
464 * @vma: pointer to struct &vm_area_struct
465 *
466 * Call from driver's mmap() function. Will handle mmap() for both queues
467 * seamlessly for videobuffer, which will receive normal per-queue offsets and
468 * proper videobuf queue pointers. The differentiation is made outside videobuf
469 * by adding a predefined offset to buffers from one of the queues and
470 * subtracting it before passing it back to videobuf. Only drivers (and
471 * thus applications) receive modified offsets.
472 */
473int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
474 struct vm_area_struct *vma);
475
476/**
477 * v4l2_m2m_init() - initialize per-driver m2m data
478 *
479 * @m2m_ops: pointer to struct v4l2_m2m_ops
480 *
481 * Usually called from driver's ``probe()`` function.
482 *
483 * Return: returns an opaque pointer to the internal data to handle M2M context
484 */
485struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops);
486
487#if defined(CONFIG_MEDIA_CONTROLLER)
488void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev);
489int v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
490 struct video_device *vdev, int function);
491#else
492static inline void
493v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev)
494{
495}
496
497static inline int
498v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
499 struct video_device *vdev, int function)
500{
501 return 0;
502}
503#endif
504
505/**
506 * v4l2_m2m_release() - cleans up and frees a m2m_dev structure
507 *
508 * @m2m_dev: opaque pointer to the internal data to handle M2M context
509 *
510 * Usually called from driver's ``remove()`` function.
511 */
512void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev);
513
514/**
515 * v4l2_m2m_ctx_init() - allocate and initialize a m2m context
516 *
517 * @m2m_dev: opaque pointer to the internal data to handle M2M context
518 * @drv_priv: driver's instance private data
519 * @queue_init: a callback for queue type-specific initialization function
520 * to be used for initializing videobuf_queues
521 *
522 * Usually called from driver's ``open()`` function.
523 */
524struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
525 void *drv_priv,
526 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq));
527
528static inline void v4l2_m2m_set_src_buffered(struct v4l2_m2m_ctx *m2m_ctx,
529 bool buffered)
530{
531 m2m_ctx->out_q_ctx.buffered = buffered;
532}
533
534static inline void v4l2_m2m_set_dst_buffered(struct v4l2_m2m_ctx *m2m_ctx,
535 bool buffered)
536{
537 m2m_ctx->cap_q_ctx.buffered = buffered;
538}
539
540/**
541 * v4l2_m2m_ctx_release() - release m2m context
542 *
543 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
544 *
545 * Usually called from driver's release() function.
546 */
547void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx);
548
549/**
550 * v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list.
551 *
552 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
553 * @vbuf: pointer to struct &vb2_v4l2_buffer
554 *
555 * Call from videobuf_queue_ops->ops->buf_queue, videobuf_queue_ops callback.
556 */
557void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
558 struct vb2_v4l2_buffer *vbuf);
559
560/**
561 * v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for
562 * use
563 *
564 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
565 */
566static inline
567unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
568{
569 return m2m_ctx->out_q_ctx.num_rdy;
570}
571
572/**
573 * v4l2_m2m_num_dst_bufs_ready() - return the number of destination buffers
574 * ready for use
575 *
576 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
577 */
578static inline
579unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
580{
581 return m2m_ctx->cap_q_ctx.num_rdy;
582}
583
584/**
585 * v4l2_m2m_next_buf() - return next buffer from the list of ready buffers
586 *
587 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
588 */
589struct vb2_v4l2_buffer *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx);
590
591/**
592 * v4l2_m2m_next_src_buf() - return next source buffer from the list of ready
593 * buffers
594 *
595 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
596 */
597static inline struct vb2_v4l2_buffer *
598v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
599{
600 return v4l2_m2m_next_buf(&m2m_ctx->out_q_ctx);
601}
602
603/**
604 * v4l2_m2m_next_dst_buf() - return next destination buffer from the list of
605 * ready buffers
606 *
607 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
608 */
609static inline struct vb2_v4l2_buffer *
610v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
611{
612 return v4l2_m2m_next_buf(&m2m_ctx->cap_q_ctx);
613}
614
615/**
616 * v4l2_m2m_last_buf() - return last buffer from the list of ready buffers
617 *
618 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
619 */
620struct vb2_v4l2_buffer *v4l2_m2m_last_buf(struct v4l2_m2m_queue_ctx *q_ctx);
621
622/**
623 * v4l2_m2m_last_src_buf() - return last destination buffer from the list of
624 * ready buffers
625 *
626 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
627 */
628static inline struct vb2_v4l2_buffer *
629v4l2_m2m_last_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
630{
631 return v4l2_m2m_last_buf(&m2m_ctx->out_q_ctx);
632}
633
634/**
635 * v4l2_m2m_last_dst_buf() - return last destination buffer from the list of
636 * ready buffers
637 *
638 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
639 */
640static inline struct vb2_v4l2_buffer *
641v4l2_m2m_last_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
642{
643 return v4l2_m2m_last_buf(&m2m_ctx->cap_q_ctx);
644}
645
646/**
647 * v4l2_m2m_for_each_dst_buf() - iterate over a list of destination ready
648 * buffers
649 *
650 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
651 * @b: current buffer of type struct v4l2_m2m_buffer
652 */
653#define v4l2_m2m_for_each_dst_buf(m2m_ctx, b) \
654 list_for_each_entry(b, &m2m_ctx->cap_q_ctx.rdy_queue, list)
655
656/**
657 * v4l2_m2m_for_each_src_buf() - iterate over a list of source ready buffers
658 *
659 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
660 * @b: current buffer of type struct v4l2_m2m_buffer
661 */
662#define v4l2_m2m_for_each_src_buf(m2m_ctx, b) \
663 list_for_each_entry(b, &m2m_ctx->out_q_ctx.rdy_queue, list)
664
665/**
666 * v4l2_m2m_for_each_dst_buf_safe() - iterate over a list of destination ready
667 * buffers safely
668 *
669 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
670 * @b: current buffer of type struct v4l2_m2m_buffer
671 * @n: used as temporary storage
672 */
673#define v4l2_m2m_for_each_dst_buf_safe(m2m_ctx, b, n) \
674 list_for_each_entry_safe(b, n, &m2m_ctx->cap_q_ctx.rdy_queue, list)
675
676/**
677 * v4l2_m2m_for_each_src_buf_safe() - iterate over a list of source ready
678 * buffers safely
679 *
680 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
681 * @b: current buffer of type struct v4l2_m2m_buffer
682 * @n: used as temporary storage
683 */
684#define v4l2_m2m_for_each_src_buf_safe(m2m_ctx, b, n) \
685 list_for_each_entry_safe(b, n, &m2m_ctx->out_q_ctx.rdy_queue, list)
686
687/**
688 * v4l2_m2m_get_src_vq() - return vb2_queue for source buffers
689 *
690 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
691 */
692static inline
693struct vb2_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx)
694{
695 return &m2m_ctx->out_q_ctx.q;
696}
697
698/**
699 * v4l2_m2m_get_dst_vq() - return vb2_queue for destination buffers
700 *
701 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
702 */
703static inline
704struct vb2_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx)
705{
706 return &m2m_ctx->cap_q_ctx.q;
707}
708
709/**
710 * v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and
711 * return it
712 *
713 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
714 */
715struct vb2_v4l2_buffer *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx);
716
717/**
718 * v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready
719 * buffers and return it
720 *
721 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
722 */
723static inline struct vb2_v4l2_buffer *
724v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
725{
726 return v4l2_m2m_buf_remove(&m2m_ctx->out_q_ctx);
727}
728
729/**
730 * v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of
731 * ready buffers and return it
732 *
733 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
734 */
735static inline struct vb2_v4l2_buffer *
736v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
737{
738 return v4l2_m2m_buf_remove(&m2m_ctx->cap_q_ctx);
739}
740
741/**
742 * v4l2_m2m_buf_remove_by_buf() - take off exact buffer from the list of ready
743 * buffers
744 *
745 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
746 * @vbuf: the buffer to be removed
747 */
748void v4l2_m2m_buf_remove_by_buf(struct v4l2_m2m_queue_ctx *q_ctx,
749 struct vb2_v4l2_buffer *vbuf);
750
751/**
752 * v4l2_m2m_src_buf_remove_by_buf() - take off exact source buffer from the list
753 * of ready buffers
754 *
755 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
756 * @vbuf: the buffer to be removed
757 */
758static inline void v4l2_m2m_src_buf_remove_by_buf(struct v4l2_m2m_ctx *m2m_ctx,
759 struct vb2_v4l2_buffer *vbuf)
760{
761 v4l2_m2m_buf_remove_by_buf(&m2m_ctx->out_q_ctx, vbuf);
762}
763
764/**
765 * v4l2_m2m_dst_buf_remove_by_buf() - take off exact destination buffer from the
766 * list of ready buffers
767 *
768 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
769 * @vbuf: the buffer to be removed
770 */
771static inline void v4l2_m2m_dst_buf_remove_by_buf(struct v4l2_m2m_ctx *m2m_ctx,
772 struct vb2_v4l2_buffer *vbuf)
773{
774 v4l2_m2m_buf_remove_by_buf(&m2m_ctx->cap_q_ctx, vbuf);
775}
776
777struct vb2_v4l2_buffer *
778v4l2_m2m_buf_remove_by_idx(struct v4l2_m2m_queue_ctx *q_ctx, unsigned int idx);
779
780static inline struct vb2_v4l2_buffer *
781v4l2_m2m_src_buf_remove_by_idx(struct v4l2_m2m_ctx *m2m_ctx, unsigned int idx)
782{
783 return v4l2_m2m_buf_remove_by_idx(&m2m_ctx->out_q_ctx, idx);
784}
785
786static inline struct vb2_v4l2_buffer *
787v4l2_m2m_dst_buf_remove_by_idx(struct v4l2_m2m_ctx *m2m_ctx, unsigned int idx)
788{
789 return v4l2_m2m_buf_remove_by_idx(&m2m_ctx->cap_q_ctx, idx);
790}
791
792/**
793 * v4l2_m2m_buf_copy_metadata() - copy buffer metadata from
794 * the output buffer to the capture buffer
795 *
796 * @out_vb: the output buffer that is the source of the metadata.
797 * @cap_vb: the capture buffer that will receive the metadata.
798 * @copy_frame_flags: copy the KEY/B/PFRAME flags as well.
799 *
800 * This helper function copies the timestamp, timecode (if the TIMECODE
801 * buffer flag was set), field and the TIMECODE, KEYFRAME, BFRAME, PFRAME
802 * and TSTAMP_SRC_MASK flags from @out_vb to @cap_vb.
803 *
804 * If @copy_frame_flags is false, then the KEYFRAME, BFRAME and PFRAME
805 * flags are not copied. This is typically needed for encoders that
806 * set this bits explicitly.
807 */
808void v4l2_m2m_buf_copy_metadata(const struct vb2_v4l2_buffer *out_vb,
809 struct vb2_v4l2_buffer *cap_vb,
810 bool copy_frame_flags);
811
812/* v4l2 request helper */
813
814void v4l2_m2m_request_queue(struct media_request *req);
815
816/* v4l2 ioctl helpers */
817
818int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
819 struct v4l2_requestbuffers *rb);
820int v4l2_m2m_ioctl_create_bufs(struct file *file, void *fh,
821 struct v4l2_create_buffers *create);
822int v4l2_m2m_ioctl_querybuf(struct file *file, void *fh,
823 struct v4l2_buffer *buf);
824int v4l2_m2m_ioctl_expbuf(struct file *file, void *fh,
825 struct v4l2_exportbuffer *eb);
826int v4l2_m2m_ioctl_qbuf(struct file *file, void *fh,
827 struct v4l2_buffer *buf);
828int v4l2_m2m_ioctl_dqbuf(struct file *file, void *fh,
829 struct v4l2_buffer *buf);
830int v4l2_m2m_ioctl_prepare_buf(struct file *file, void *fh,
831 struct v4l2_buffer *buf);
832int v4l2_m2m_ioctl_streamon(struct file *file, void *fh,
833 enum v4l2_buf_type type);
834int v4l2_m2m_ioctl_streamoff(struct file *file, void *fh,
835 enum v4l2_buf_type type);
836int v4l2_m2m_ioctl_encoder_cmd(struct file *file, void *fh,
837 struct v4l2_encoder_cmd *ec);
838int v4l2_m2m_ioctl_decoder_cmd(struct file *file, void *fh,
839 struct v4l2_decoder_cmd *dc);
840int v4l2_m2m_ioctl_try_encoder_cmd(struct file *file, void *fh,
841 struct v4l2_encoder_cmd *ec);
842int v4l2_m2m_ioctl_try_decoder_cmd(struct file *file, void *fh,
843 struct v4l2_decoder_cmd *dc);
844int v4l2_m2m_ioctl_stateless_try_decoder_cmd(struct file *file, void *fh,
845 struct v4l2_decoder_cmd *dc);
846int v4l2_m2m_ioctl_stateless_decoder_cmd(struct file *file, void *priv,
847 struct v4l2_decoder_cmd *dc);
848int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma);
849__poll_t v4l2_m2m_fop_poll(struct file *file, poll_table *wait);
850
851#endif /* _MEDIA_V4L2_MEM2MEM_H */
852
1/*
2 * Memory-to-memory device framework for Video for Linux 2.
3 *
4 * Helper functions for devices that use memory buffers for both source
5 * and destination.
6 *
7 * Copyright (c) 2009 Samsung Electronics Co., Ltd.
8 * Pawel Osciak, <pawel@osciak.com>
9 * Marek Szyprowski, <m.szyprowski@samsung.com>
10 *
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
14 * License, or (at your option) any later version
15 */
16
17#ifndef _MEDIA_V4L2_MEM2MEM_H
18#define _MEDIA_V4L2_MEM2MEM_H
19
20#include <media/videobuf2-v4l2.h>
21
22/**
23 * struct v4l2_m2m_ops - mem-to-mem device driver callbacks
24 * @device_run: required. Begin the actual job (transaction) inside this
25 * callback.
26 * The job does NOT have to end before this callback returns
27 * (and it will be the usual case). When the job finishes,
28 * v4l2_m2m_job_finish() has to be called.
29 * @job_ready: optional. Should return 0 if the driver does not have a job
30 * fully prepared to run yet (i.e. it will not be able to finish a
31 * transaction without sleeping). If not provided, it will be
32 * assumed that one source and one destination buffer are all
33 * that is required for the driver to perform one full transaction.
34 * This method may not sleep.
35 * @job_abort: required. Informs the driver that it has to abort the currently
36 * running transaction as soon as possible (i.e. as soon as it can
37 * stop the device safely; e.g. in the next interrupt handler),
38 * even if the transaction would not have been finished by then.
39 * After the driver performs the necessary steps, it has to call
40 * v4l2_m2m_job_finish() (as if the transaction ended normally).
41 * This function does not have to (and will usually not) wait
42 * until the device enters a state when it can be stopped.
43 * @lock: optional. Define a driver's own lock callback, instead of using
44 * &v4l2_m2m_ctx->q_lock.
45 * @unlock: optional. Define a driver's own unlock callback, instead of
46 * using &v4l2_m2m_ctx->q_lock.
47 */
48struct v4l2_m2m_ops {
49 void (*device_run)(void *priv);
50 int (*job_ready)(void *priv);
51 void (*job_abort)(void *priv);
52 void (*lock)(void *priv);
53 void (*unlock)(void *priv);
54};
55
56struct v4l2_m2m_dev;
57
58/**
59 * struct v4l2_m2m_queue_ctx - represents a queue for buffers ready to be
60 * processed
61 *
62 * @q: pointer to struct &vb2_queue
63 * @rdy_queue: List of V4L2 mem-to-mem queues
64 * @rdy_spinlock: spin lock to protect the struct usage
65 * @num_rdy: number of buffers ready to be processed
66 * @buffered: is the queue buffered?
67 *
68 * Queue for buffers ready to be processed as soon as this
69 * instance receives access to the device.
70 */
71
72struct v4l2_m2m_queue_ctx {
73 struct vb2_queue q;
74
75 struct list_head rdy_queue;
76 spinlock_t rdy_spinlock;
77 u8 num_rdy;
78 bool buffered;
79};
80
81/**
82 * struct v4l2_m2m_ctx - Memory to memory context structure
83 *
84 * @q_lock: struct &mutex lock
85 * @m2m_dev: opaque pointer to the internal data to handle M2M context
86 * @cap_q_ctx: Capture (output to memory) queue context
87 * @out_q_ctx: Output (input from memory) queue context
88 * @queue: List of memory to memory contexts
89 * @job_flags: Job queue flags, used internally by v4l2-mem2mem.c:
90 * %TRANS_QUEUED, %TRANS_RUNNING and %TRANS_ABORT.
91 * @finished: Wait queue used to signalize when a job queue finished.
92 * @priv: Instance private data
93 *
94 * The memory to memory context is specific to a file handle, NOT to e.g.
95 * a device.
96 */
97struct v4l2_m2m_ctx {
98 /* optional cap/out vb2 queues lock */
99 struct mutex *q_lock;
100
101 /* internal use only */
102 struct v4l2_m2m_dev *m2m_dev;
103
104 struct v4l2_m2m_queue_ctx cap_q_ctx;
105
106 struct v4l2_m2m_queue_ctx out_q_ctx;
107
108 /* For device job queue */
109 struct list_head queue;
110 unsigned long job_flags;
111 wait_queue_head_t finished;
112
113 void *priv;
114};
115
116/**
117 * struct v4l2_m2m_buffer - Memory to memory buffer
118 *
119 * @vb: pointer to struct &vb2_v4l2_buffer
120 * @list: list of m2m buffers
121 */
122struct v4l2_m2m_buffer {
123 struct vb2_v4l2_buffer vb;
124 struct list_head list;
125};
126
127/**
128 * v4l2_m2m_get_curr_priv() - return driver private data for the currently
129 * running instance or NULL if no instance is running
130 *
131 * @m2m_dev: opaque pointer to the internal data to handle M2M context
132 */
133void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev);
134
135/**
136 * v4l2_m2m_get_vq() - return vb2_queue for the given type
137 *
138 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
139 * @type: type of the V4L2 buffer, as defined by enum &v4l2_buf_type
140 */
141struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
142 enum v4l2_buf_type type);
143
144/**
145 * v4l2_m2m_try_schedule() - check whether an instance is ready to be added to
146 * the pending job queue and add it if so.
147 *
148 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
149 *
150 * There are three basic requirements an instance has to meet to be able to run:
151 * 1) at least one source buffer has to be queued,
152 * 2) at least one destination buffer has to be queued,
153 * 3) streaming has to be on.
154 *
155 * If a queue is buffered (for example a decoder hardware ringbuffer that has
156 * to be drained before doing streamoff), allow scheduling without v4l2 buffers
157 * on that queue.
158 *
159 * There may also be additional, custom requirements. In such case the driver
160 * should supply a custom callback (job_ready in v4l2_m2m_ops) that should
161 * return 1 if the instance is ready.
162 * An example of the above could be an instance that requires more than one
163 * src/dst buffer per transaction.
164 */
165void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx);
166
167/**
168 * v4l2_m2m_job_finish() - inform the framework that a job has been finished
169 * and have it clean up
170 *
171 * @m2m_dev: opaque pointer to the internal data to handle M2M context
172 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
173 *
174 * Called by a driver to yield back the device after it has finished with it.
175 * Should be called as soon as possible after reaching a state which allows
176 * other instances to take control of the device.
177 *
178 * This function has to be called only after &v4l2_m2m_ops->device_run
179 * callback has been called on the driver. To prevent recursion, it should
180 * not be called directly from the &v4l2_m2m_ops->device_run callback though.
181 */
182void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
183 struct v4l2_m2m_ctx *m2m_ctx);
184
185static inline void
186v4l2_m2m_buf_done(struct vb2_v4l2_buffer *buf, enum vb2_buffer_state state)
187{
188 vb2_buffer_done(&buf->vb2_buf, state);
189}
190
191/**
192 * v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer
193 *
194 * @file: pointer to struct &file
195 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
196 * @reqbufs: pointer to struct &v4l2_requestbuffers
197 */
198int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
199 struct v4l2_requestbuffers *reqbufs);
200
201/**
202 * v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer
203 *
204 * @file: pointer to struct &file
205 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
206 * @buf: pointer to struct &v4l2_buffer
207 *
208 * See v4l2_m2m_mmap() documentation for details.
209 */
210int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
211 struct v4l2_buffer *buf);
212
213/**
214 * v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on
215 * the type
216 *
217 * @file: pointer to struct &file
218 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
219 * @buf: pointer to struct &v4l2_buffer
220 */
221int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
222 struct v4l2_buffer *buf);
223
224/**
225 * v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on
226 * the type
227 *
228 * @file: pointer to struct &file
229 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
230 * @buf: pointer to struct &v4l2_buffer
231 */
232int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
233 struct v4l2_buffer *buf);
234
235/**
236 * v4l2_m2m_prepare_buf() - prepare a source or destination buffer, depending on
237 * the type
238 *
239 * @file: pointer to struct &file
240 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
241 * @buf: pointer to struct &v4l2_buffer
242 */
243int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
244 struct v4l2_buffer *buf);
245
246/**
247 * v4l2_m2m_create_bufs() - create a source or destination buffer, depending
248 * on the type
249 *
250 * @file: pointer to struct &file
251 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
252 * @create: pointer to struct &v4l2_create_buffers
253 */
254int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
255 struct v4l2_create_buffers *create);
256
257/**
258 * v4l2_m2m_expbuf() - export a source or destination buffer, depending on
259 * the type
260 *
261 * @file: pointer to struct &file
262 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
263 * @eb: pointer to struct &v4l2_exportbuffer
264 */
265int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
266 struct v4l2_exportbuffer *eb);
267
268/**
269 * v4l2_m2m_streamon() - turn on streaming for a video queue
270 *
271 * @file: pointer to struct &file
272 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
273 * @type: type of the V4L2 buffer, as defined by enum &v4l2_buf_type
274 */
275int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
276 enum v4l2_buf_type type);
277
278/**
279 * v4l2_m2m_streamoff() - turn off streaming for a video queue
280 *
281 * @file: pointer to struct &file
282 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
283 * @type: type of the V4L2 buffer, as defined by enum &v4l2_buf_type
284 */
285int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
286 enum v4l2_buf_type type);
287
288/**
289 * v4l2_m2m_poll() - poll replacement, for destination buffers only
290 *
291 * @file: pointer to struct &file
292 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
293 * @wait: pointer to struct &poll_table_struct
294 *
295 * Call from the driver's poll() function. Will poll both queues. If a buffer
296 * is available to dequeue (with dqbuf) from the source queue, this will
297 * indicate that a non-blocking write can be performed, while read will be
298 * returned in case of the destination queue.
299 */
300__poll_t v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
301 struct poll_table_struct *wait);
302
303/**
304 * v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer
305 *
306 * @file: pointer to struct &file
307 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
308 * @vma: pointer to struct &vm_area_struct
309 *
310 * Call from driver's mmap() function. Will handle mmap() for both queues
311 * seamlessly for videobuffer, which will receive normal per-queue offsets and
312 * proper videobuf queue pointers. The differentiation is made outside videobuf
313 * by adding a predefined offset to buffers from one of the queues and
314 * subtracting it before passing it back to videobuf. Only drivers (and
315 * thus applications) receive modified offsets.
316 */
317int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
318 struct vm_area_struct *vma);
319
320/**
321 * v4l2_m2m_init() - initialize per-driver m2m data
322 *
323 * @m2m_ops: pointer to struct v4l2_m2m_ops
324 *
325 * Usually called from driver's ``probe()`` function.
326 *
327 * Return: returns an opaque pointer to the internal data to handle M2M context
328 */
329struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops);
330
331/**
332 * v4l2_m2m_release() - cleans up and frees a m2m_dev structure
333 *
334 * @m2m_dev: opaque pointer to the internal data to handle M2M context
335 *
336 * Usually called from driver's ``remove()`` function.
337 */
338void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev);
339
340/**
341 * v4l2_m2m_ctx_init() - allocate and initialize a m2m context
342 *
343 * @m2m_dev: opaque pointer to the internal data to handle M2M context
344 * @drv_priv: driver's instance private data
345 * @queue_init: a callback for queue type-specific initialization function
346 * to be used for initializing videobuf_queues
347 *
348 * Usually called from driver's ``open()`` function.
349 */
350struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
351 void *drv_priv,
352 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq));
353
354static inline void v4l2_m2m_set_src_buffered(struct v4l2_m2m_ctx *m2m_ctx,
355 bool buffered)
356{
357 m2m_ctx->out_q_ctx.buffered = buffered;
358}
359
360static inline void v4l2_m2m_set_dst_buffered(struct v4l2_m2m_ctx *m2m_ctx,
361 bool buffered)
362{
363 m2m_ctx->cap_q_ctx.buffered = buffered;
364}
365
366/**
367 * v4l2_m2m_ctx_release() - release m2m context
368 *
369 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
370 *
371 * Usually called from driver's release() function.
372 */
373void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx);
374
375/**
376 * v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list.
377 *
378 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
379 * @vbuf: pointer to struct &vb2_v4l2_buffer
380 *
381 * Call from videobuf_queue_ops->ops->buf_queue, videobuf_queue_ops callback.
382 */
383void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
384 struct vb2_v4l2_buffer *vbuf);
385
386/**
387 * v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for
388 * use
389 *
390 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
391 */
392static inline
393unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
394{
395 return m2m_ctx->out_q_ctx.num_rdy;
396}
397
398/**
399 * v4l2_m2m_num_dst_bufs_ready() - return the number of destination buffers
400 * ready for use
401 *
402 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
403 */
404static inline
405unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
406{
407 return m2m_ctx->cap_q_ctx.num_rdy;
408}
409
410/**
411 * v4l2_m2m_next_buf() - return next buffer from the list of ready buffers
412 *
413 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
414 */
415void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx);
416
417/**
418 * v4l2_m2m_next_src_buf() - return next source buffer from the list of ready
419 * buffers
420 *
421 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
422 */
423static inline void *v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
424{
425 return v4l2_m2m_next_buf(&m2m_ctx->out_q_ctx);
426}
427
428/**
429 * v4l2_m2m_next_dst_buf() - return next destination buffer from the list of
430 * ready buffers
431 *
432 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
433 */
434static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
435{
436 return v4l2_m2m_next_buf(&m2m_ctx->cap_q_ctx);
437}
438
439/**
440 * v4l2_m2m_for_each_dst_buf() - iterate over a list of destination ready
441 * buffers
442 *
443 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
444 * @b: current buffer of type struct v4l2_m2m_buffer
445 */
446#define v4l2_m2m_for_each_dst_buf(m2m_ctx, b) \
447 list_for_each_entry(b, &m2m_ctx->cap_q_ctx.rdy_queue, list)
448
449/**
450 * v4l2_m2m_for_each_src_buf() - iterate over a list of source ready buffers
451 *
452 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
453 * @b: current buffer of type struct v4l2_m2m_buffer
454 */
455#define v4l2_m2m_for_each_src_buf(m2m_ctx, b) \
456 list_for_each_entry(b, &m2m_ctx->out_q_ctx.rdy_queue, list)
457
458/**
459 * v4l2_m2m_for_each_dst_buf_safe() - iterate over a list of destination ready
460 * buffers safely
461 *
462 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
463 * @b: current buffer of type struct v4l2_m2m_buffer
464 * @n: used as temporary storage
465 */
466#define v4l2_m2m_for_each_dst_buf_safe(m2m_ctx, b, n) \
467 list_for_each_entry_safe(b, n, &m2m_ctx->cap_q_ctx.rdy_queue, list)
468
469/**
470 * v4l2_m2m_for_each_src_buf_safe() - iterate over a list of source ready
471 * buffers safely
472 *
473 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
474 * @b: current buffer of type struct v4l2_m2m_buffer
475 * @n: used as temporary storage
476 */
477#define v4l2_m2m_for_each_src_buf_safe(m2m_ctx, b, n) \
478 list_for_each_entry_safe(b, n, &m2m_ctx->out_q_ctx.rdy_queue, list)
479
480/**
481 * v4l2_m2m_get_src_vq() - return vb2_queue for source buffers
482 *
483 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
484 */
485static inline
486struct vb2_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx)
487{
488 return &m2m_ctx->out_q_ctx.q;
489}
490
491/**
492 * v4l2_m2m_get_dst_vq() - return vb2_queue for destination buffers
493 *
494 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
495 */
496static inline
497struct vb2_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx)
498{
499 return &m2m_ctx->cap_q_ctx.q;
500}
501
502/**
503 * v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and
504 * return it
505 *
506 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
507 */
508void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx);
509
510/**
511 * v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready
512 * buffers and return it
513 *
514 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
515 */
516static inline void *v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
517{
518 return v4l2_m2m_buf_remove(&m2m_ctx->out_q_ctx);
519}
520
521/**
522 * v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of
523 * ready buffers and return it
524 *
525 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
526 */
527static inline void *v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
528{
529 return v4l2_m2m_buf_remove(&m2m_ctx->cap_q_ctx);
530}
531
532/**
533 * v4l2_m2m_buf_remove_by_buf() - take off exact buffer from the list of ready
534 * buffers
535 *
536 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
537 * @vbuf: the buffer to be removed
538 */
539void v4l2_m2m_buf_remove_by_buf(struct v4l2_m2m_queue_ctx *q_ctx,
540 struct vb2_v4l2_buffer *vbuf);
541
542/**
543 * v4l2_m2m_src_buf_remove_by_buf() - take off exact source buffer from the list
544 * of ready buffers
545 *
546 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
547 * @vbuf: the buffer to be removed
548 */
549static inline void v4l2_m2m_src_buf_remove_by_buf(struct v4l2_m2m_ctx *m2m_ctx,
550 struct vb2_v4l2_buffer *vbuf)
551{
552 v4l2_m2m_buf_remove_by_buf(&m2m_ctx->out_q_ctx, vbuf);
553}
554
555/**
556 * v4l2_m2m_dst_buf_remove_by_buf() - take off exact destination buffer from the
557 * list of ready buffers
558 *
559 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
560 * @vbuf: the buffer to be removed
561 */
562static inline void v4l2_m2m_dst_buf_remove_by_buf(struct v4l2_m2m_ctx *m2m_ctx,
563 struct vb2_v4l2_buffer *vbuf)
564{
565 v4l2_m2m_buf_remove_by_buf(&m2m_ctx->cap_q_ctx, vbuf);
566}
567
568struct vb2_v4l2_buffer *
569v4l2_m2m_buf_remove_by_idx(struct v4l2_m2m_queue_ctx *q_ctx, unsigned int idx);
570
571static inline struct vb2_v4l2_buffer *
572v4l2_m2m_src_buf_remove_by_idx(struct v4l2_m2m_ctx *m2m_ctx, unsigned int idx)
573{
574 return v4l2_m2m_buf_remove_by_idx(&m2m_ctx->out_q_ctx, idx);
575}
576
577static inline struct vb2_v4l2_buffer *
578v4l2_m2m_dst_buf_remove_by_idx(struct v4l2_m2m_ctx *m2m_ctx, unsigned int idx)
579{
580 return v4l2_m2m_buf_remove_by_idx(&m2m_ctx->cap_q_ctx, idx);
581}
582
583/* v4l2 ioctl helpers */
584
585int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
586 struct v4l2_requestbuffers *rb);
587int v4l2_m2m_ioctl_create_bufs(struct file *file, void *fh,
588 struct v4l2_create_buffers *create);
589int v4l2_m2m_ioctl_querybuf(struct file *file, void *fh,
590 struct v4l2_buffer *buf);
591int v4l2_m2m_ioctl_expbuf(struct file *file, void *fh,
592 struct v4l2_exportbuffer *eb);
593int v4l2_m2m_ioctl_qbuf(struct file *file, void *fh,
594 struct v4l2_buffer *buf);
595int v4l2_m2m_ioctl_dqbuf(struct file *file, void *fh,
596 struct v4l2_buffer *buf);
597int v4l2_m2m_ioctl_prepare_buf(struct file *file, void *fh,
598 struct v4l2_buffer *buf);
599int v4l2_m2m_ioctl_streamon(struct file *file, void *fh,
600 enum v4l2_buf_type type);
601int v4l2_m2m_ioctl_streamoff(struct file *file, void *fh,
602 enum v4l2_buf_type type);
603int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma);
604__poll_t v4l2_m2m_fop_poll(struct file *file, poll_table *wait);
605
606#endif /* _MEDIA_V4L2_MEM2MEM_H */
607