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_suspend() - stop new jobs from being run and wait for current job 309 * to finish 310 * 311 * @m2m_dev: opaque pointer to the internal data to handle M2M context 312 * 313 * Called by a driver in the suspend hook. Stop new jobs from being run, and 314 * wait for current running job to finish. 315 */ 316void v4l2_m2m_suspend(struct v4l2_m2m_dev *m2m_dev); 317 318/** 319 * v4l2_m2m_resume() - resume job running and try to run a queued job 320 * 321 * @m2m_dev: opaque pointer to the internal data to handle M2M context 322 * 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 325 * there is any. 326 */ 327void v4l2_m2m_resume(struct v4l2_m2m_dev *m2m_dev); 328 329/** 330 * v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer 331 * 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 335 */ 336int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 337 struct v4l2_requestbuffers *reqbufs); 338 339/** 340 * v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer 341 * 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 345 * 346 * See v4l2_m2m_mmap() documentation for details. 347 */ 348int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 349 struct v4l2_buffer *buf); 350 351/** 352 * v4l2_m2m_qbuf() - enqueue 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_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 360 struct v4l2_buffer *buf); 361 362/** 363 * v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on 364 * 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 * @buf: pointer to struct &v4l2_buffer 369 */ 370int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 371 struct v4l2_buffer *buf); 372 373/** 374 * v4l2_m2m_prepare_buf() - prepare 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 * @buf: pointer to struct &v4l2_buffer 380 */ 381int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 382 struct v4l2_buffer *buf); 383 384/** 385 * v4l2_m2m_create_bufs() - create a source or destination buffer, depending 386 * on the type 387 * 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 391 */ 392int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 393 struct v4l2_create_buffers *create); 394 395/** 396 * v4l2_m2m_expbuf() - export a source or destination buffer, depending on 397 * the type 398 * 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 402 */ 403int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 404 struct v4l2_exportbuffer *eb); 405 406/** 407 * v4l2_m2m_streamon() - turn on streaming for a video queue 408 * 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 412 */ 413int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 414 enum v4l2_buf_type type); 415 416/** 417 * v4l2_m2m_streamoff() - turn off streaming for a video queue 418 * 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 422 */ 423int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 424 enum v4l2_buf_type type); 425 426/** 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 429 * 430 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 431 * @q: queue 432 */ 433void v4l2_m2m_update_start_streaming_state(struct v4l2_m2m_ctx *m2m_ctx, 434 struct vb2_queue *q); 435 436/** 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 439 * 440 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 441 * @q: queue 442 */ 443void v4l2_m2m_update_stop_streaming_state(struct v4l2_m2m_ctx *m2m_ctx, 444 struct vb2_queue *q); 445 446/** 447 * v4l2_m2m_encoder_cmd() - execute an encoder command 448 * 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 452 */ 453int v4l2_m2m_encoder_cmd(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 454 struct v4l2_encoder_cmd *ec); 455 456/** 457 * v4l2_m2m_decoder_cmd() - execute a decoder command 458 * 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 462 */ 463int v4l2_m2m_decoder_cmd(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 464 struct v4l2_decoder_cmd *dc); 465 466/** 467 * v4l2_m2m_poll() - poll replacement, for destination buffers only 468 * 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 472 * 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. 477 */ 478__poll_t v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 479 struct poll_table_struct *wait); 480 481/** 482 * v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer 483 * 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 487 * 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. 494 */ 495int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 496 struct vm_area_struct *vma); 497 498/** 499 * v4l2_m2m_init() - initialize per-driver m2m data 500 * 501 * @m2m_ops: pointer to struct v4l2_m2m_ops 502 * 503 * Usually called from driver's ``probe()`` function. 504 * 505 * Return: returns an opaque pointer to the internal data to handle M2M context 506 */ 507struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops); 508 509#if defined(CONFIG_MEDIA_CONTROLLER) 510void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev); 511int v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev, 512 struct video_device *vdev, int function); 513#else 514static inline void 515v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev) 516{ 517} 518 519static inline int 520v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev, 521 struct video_device *vdev, int function) 522{ 523 return 0; 524} 525#endif 526 527/** 528 * v4l2_m2m_release() - cleans up and frees a m2m_dev structure 529 * 530 * @m2m_dev: opaque pointer to the internal data to handle M2M context 531 * 532 * Usually called from driver's ``remove()`` function. 533 */ 534void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev); 535 536/** 537 * v4l2_m2m_ctx_init() - allocate and initialize a m2m context 538 * 539 * @m2m_dev: opaque pointer to the internal data to handle M2M context 540 * @drv_priv: driver's instance private data 541 * @queue_init: a callback for queue type-specific initialization function 542 * to be used for initializing videobuf_queues 543 * 544 * Usually called from driver's ``open()`` function. 545 */ 546struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev, 547 void *drv_priv, 548 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)); 549 550static inline void v4l2_m2m_set_src_buffered(struct v4l2_m2m_ctx *m2m_ctx, 551 bool buffered) 552{ 553 m2m_ctx->out_q_ctx.buffered = buffered; 554} 555 556static inline void v4l2_m2m_set_dst_buffered(struct v4l2_m2m_ctx *m2m_ctx, 557 bool buffered) 558{ 559 m2m_ctx->cap_q_ctx.buffered = buffered; 560} 561 562/** 563 * v4l2_m2m_ctx_release() - release m2m context 564 * 565 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 566 * 567 * Usually called from driver's release() function. 568 */ 569void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx); 570 571/** 572 * v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list. 573 * 574 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 575 * @vbuf: pointer to struct &vb2_v4l2_buffer 576 * 577 * Call from videobuf_queue_ops->ops->buf_queue, videobuf_queue_ops callback. 578 */ 579void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, 580 struct vb2_v4l2_buffer *vbuf); 581 582/** 583 * v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for 584 * use 585 * 586 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 587 */ 588static inline 589unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx) 590{ 591 return m2m_ctx->out_q_ctx.num_rdy; 592} 593 594/** 595 * v4l2_m2m_num_dst_bufs_ready() - return the number of destination buffers 596 * ready for use 597 * 598 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 599 */ 600static inline 601unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx) 602{ 603 return m2m_ctx->cap_q_ctx.num_rdy; 604} 605 606/** 607 * v4l2_m2m_next_buf() - return next buffer from the list of ready buffers 608 * 609 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx 610 */ 611struct vb2_v4l2_buffer *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx); 612 613/** 614 * v4l2_m2m_next_src_buf() - return next source buffer from the list of ready 615 * buffers 616 * 617 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 618 */ 619static inline struct vb2_v4l2_buffer * 620v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx) 621{ 622 return v4l2_m2m_next_buf(&m2m_ctx->out_q_ctx); 623} 624 625/** 626 * v4l2_m2m_next_dst_buf() - return next destination buffer from the list of 627 * ready buffers 628 * 629 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 630 */ 631static inline struct vb2_v4l2_buffer * 632v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx) 633{ 634 return v4l2_m2m_next_buf(&m2m_ctx->cap_q_ctx); 635} 636 637/** 638 * v4l2_m2m_last_buf() - return last buffer from the list of ready buffers 639 * 640 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx 641 */ 642struct vb2_v4l2_buffer *v4l2_m2m_last_buf(struct v4l2_m2m_queue_ctx *q_ctx); 643 644/** 645 * v4l2_m2m_last_src_buf() - return last destination buffer from the list of 646 * ready buffers 647 * 648 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 649 */ 650static inline struct vb2_v4l2_buffer * 651v4l2_m2m_last_src_buf(struct v4l2_m2m_ctx *m2m_ctx) 652{ 653 return v4l2_m2m_last_buf(&m2m_ctx->out_q_ctx); 654} 655 656/** 657 * v4l2_m2m_last_dst_buf() - return last destination buffer from the list of 658 * ready buffers 659 * 660 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 661 */ 662static inline struct vb2_v4l2_buffer * 663v4l2_m2m_last_dst_buf(struct v4l2_m2m_ctx *m2m_ctx) 664{ 665 return v4l2_m2m_last_buf(&m2m_ctx->cap_q_ctx); 666} 667 668/** 669 * v4l2_m2m_for_each_dst_buf() - iterate over a list of destination ready 670 * buffers 671 * 672 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 673 * @b: current buffer of type struct v4l2_m2m_buffer 674 */ 675#define v4l2_m2m_for_each_dst_buf(m2m_ctx, b) \ 676 list_for_each_entry(b, &m2m_ctx->cap_q_ctx.rdy_queue, list) 677 678/** 679 * v4l2_m2m_for_each_src_buf() - iterate over a list of source ready buffers 680 * 681 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 682 * @b: current buffer of type struct v4l2_m2m_buffer 683 */ 684#define v4l2_m2m_for_each_src_buf(m2m_ctx, b) \ 685 list_for_each_entry(b, &m2m_ctx->out_q_ctx.rdy_queue, list) 686 687/** 688 * v4l2_m2m_for_each_dst_buf_safe() - iterate over a list of destination ready 689 * buffers safely 690 * 691 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 692 * @b: current buffer of type struct v4l2_m2m_buffer 693 * @n: used as temporary storage 694 */ 695#define v4l2_m2m_for_each_dst_buf_safe(m2m_ctx, b, n) \ 696 list_for_each_entry_safe(b, n, &m2m_ctx->cap_q_ctx.rdy_queue, list) 697 698/** 699 * v4l2_m2m_for_each_src_buf_safe() - iterate over a list of source ready 700 * buffers safely 701 * 702 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 703 * @b: current buffer of type struct v4l2_m2m_buffer 704 * @n: used as temporary storage 705 */ 706#define v4l2_m2m_for_each_src_buf_safe(m2m_ctx, b, n) \ 707 list_for_each_entry_safe(b, n, &m2m_ctx->out_q_ctx.rdy_queue, list) 708 709/** 710 * v4l2_m2m_get_src_vq() - return vb2_queue for source buffers 711 * 712 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 713 */ 714static inline 715struct vb2_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx) 716{ 717 return &m2m_ctx->out_q_ctx.q; 718} 719 720/** 721 * v4l2_m2m_get_dst_vq() - return vb2_queue for destination buffers 722 * 723 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 724 */ 725static inline 726struct vb2_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx) 727{ 728 return &m2m_ctx->cap_q_ctx.q; 729} 730 731/** 732 * v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and 733 * return it 734 * 735 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx 736 */ 737struct vb2_v4l2_buffer *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx); 738 739/** 740 * v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready 741 * buffers and return it 742 * 743 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 744 */ 745static inline struct vb2_v4l2_buffer * 746v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx) 747{ 748 return v4l2_m2m_buf_remove(&m2m_ctx->out_q_ctx); 749} 750 751/** 752 * v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of 753 * ready buffers and return it 754 * 755 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 756 */ 757static inline struct vb2_v4l2_buffer * 758v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx) 759{ 760 return v4l2_m2m_buf_remove(&m2m_ctx->cap_q_ctx); 761} 762 763/** 764 * v4l2_m2m_buf_remove_by_buf() - take off exact buffer from the list of ready 765 * buffers 766 * 767 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx 768 * @vbuf: the buffer to be removed 769 */ 770void v4l2_m2m_buf_remove_by_buf(struct v4l2_m2m_queue_ctx *q_ctx, 771 struct vb2_v4l2_buffer *vbuf); 772 773/** 774 * v4l2_m2m_src_buf_remove_by_buf() - take off exact source buffer from the list 775 * of ready buffers 776 * 777 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 778 * @vbuf: the buffer to be removed 779 */ 780static inline void v4l2_m2m_src_buf_remove_by_buf(struct v4l2_m2m_ctx *m2m_ctx, 781 struct vb2_v4l2_buffer *vbuf) 782{ 783 v4l2_m2m_buf_remove_by_buf(&m2m_ctx->out_q_ctx, vbuf); 784} 785 786/** 787 * v4l2_m2m_dst_buf_remove_by_buf() - take off exact destination buffer from the 788 * list of ready buffers 789 * 790 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx 791 * @vbuf: the buffer to be removed 792 */ 793static inline void v4l2_m2m_dst_buf_remove_by_buf(struct v4l2_m2m_ctx *m2m_ctx, 794 struct vb2_v4l2_buffer *vbuf) 795{ 796 v4l2_m2m_buf_remove_by_buf(&m2m_ctx->cap_q_ctx, vbuf); 797} 798 799struct vb2_v4l2_buffer * 800v4l2_m2m_buf_remove_by_idx(struct v4l2_m2m_queue_ctx *q_ctx, unsigned int idx); 801 802static inline struct vb2_v4l2_buffer * 803v4l2_m2m_src_buf_remove_by_idx(struct v4l2_m2m_ctx *m2m_ctx, unsigned int idx) 804{ 805 return v4l2_m2m_buf_remove_by_idx(&m2m_ctx->out_q_ctx, idx); 806} 807 808static inline struct vb2_v4l2_buffer * 809v4l2_m2m_dst_buf_remove_by_idx(struct v4l2_m2m_ctx *m2m_ctx, unsigned int idx) 810{ 811 return v4l2_m2m_buf_remove_by_idx(&m2m_ctx->cap_q_ctx, idx); 812} 813 814/** 815 * v4l2_m2m_buf_copy_metadata() - copy buffer metadata from 816 * the output buffer to the capture buffer 817 * 818 * @out_vb: the output buffer that is the source of the metadata. 819 * @cap_vb: the capture buffer that will receive the metadata. 820 * @copy_frame_flags: copy the KEY/B/PFRAME flags as well. 821 * 822 * This helper function copies the timestamp, timecode (if the TIMECODE 823 * buffer flag was set), field and the TIMECODE, KEYFRAME, BFRAME, PFRAME 824 * and TSTAMP_SRC_MASK flags from @out_vb to @cap_vb. 825 * 826 * If @copy_frame_flags is false, then the KEYFRAME, BFRAME and PFRAME 827 * flags are not copied. This is typically needed for encoders that 828 * set this bits explicitly. 829 */ 830void v4l2_m2m_buf_copy_metadata(const struct vb2_v4l2_buffer *out_vb, 831 struct vb2_v4l2_buffer *cap_vb, 832 bool copy_frame_flags); 833 834/* v4l2 request helper */ 835 836void v4l2_m2m_request_queue(struct media_request *req); 837 838/* v4l2 ioctl helpers */ 839 840int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv, 841 struct v4l2_requestbuffers *rb); 842int v4l2_m2m_ioctl_create_bufs(struct file *file, void *fh, 843 struct v4l2_create_buffers *create); 844int v4l2_m2m_ioctl_querybuf(struct file *file, void *fh, 845 struct v4l2_buffer *buf); 846int v4l2_m2m_ioctl_expbuf(struct file *file, void *fh, 847 struct v4l2_exportbuffer *eb); 848int v4l2_m2m_ioctl_qbuf(struct file *file, void *fh, 849 struct v4l2_buffer *buf); 850int v4l2_m2m_ioctl_dqbuf(struct file *file, void *fh, 851 struct v4l2_buffer *buf); 852int v4l2_m2m_ioctl_prepare_buf(struct file *file, void *fh, 853 struct v4l2_buffer *buf); 854int v4l2_m2m_ioctl_streamon(struct file *file, void *fh, 855 enum v4l2_buf_type type); 856int v4l2_m2m_ioctl_streamoff(struct file *file, void *fh, 857 enum v4l2_buf_type type); 858int v4l2_m2m_ioctl_encoder_cmd(struct file *file, void *fh, 859 struct v4l2_encoder_cmd *ec); 860int v4l2_m2m_ioctl_decoder_cmd(struct file *file, void *fh, 861 struct v4l2_decoder_cmd *dc); 862int v4l2_m2m_ioctl_try_encoder_cmd(struct file *file, void *fh, 863 struct v4l2_encoder_cmd *ec); 864int v4l2_m2m_ioctl_try_decoder_cmd(struct file *file, void *fh, 865 struct v4l2_decoder_cmd *dc); 866int v4l2_m2m_ioctl_stateless_try_decoder_cmd(struct file *file, void *fh, 867 struct v4l2_decoder_cmd *dc); 868int v4l2_m2m_ioctl_stateless_decoder_cmd(struct file *file, void *priv, 869 struct v4l2_decoder_cmd *dc); 870int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma); 871__poll_t v4l2_m2m_fop_poll(struct file *file, poll_table *wait); 872 873#endif /* _MEDIA_V4L2_MEM2MEM_H */ 874 875