1 /* 2 * Memory-to-memory device framework for Video for Linux 2 and videobuf. 3 * 4 * Helper functions for devices that use videobuf buffers for both their 5 * source and destination. 6 * 7 * Copyright (c) 2009-2010 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 License, or (at your 14 * option) any later version. 15 */ 16 #include <linux/module.h> 17 #include <linux/sched.h> 18 #include <linux/slab.h> 19 20 #include <media/videobuf2-core.h> 21 #include <media/v4l2-mem2mem.h> 22 #include <media/v4l2-dev.h> 23 #include <media/v4l2-fh.h> 24 #include <media/v4l2-event.h> 25 26 MODULE_DESCRIPTION("Mem to mem device framework for videobuf"); 27 MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>"); 28 MODULE_LICENSE("GPL"); 29 30 static bool debug; 31 module_param(debug, bool, 0644); 32 33 #define dprintk(fmt, arg...) \ 34 do { \ 35 if (debug) \ 36 printk(KERN_DEBUG "%s: " fmt, __func__, ## arg);\ 37 } while (0) 38 39 40 /* Instance is already queued on the job_queue */ 41 #define TRANS_QUEUED (1 << 0) 42 /* Instance is currently running in hardware */ 43 #define TRANS_RUNNING (1 << 1) 44 45 46 /* Offset base for buffers on the destination queue - used to distinguish 47 * between source and destination buffers when mmapping - they receive the same 48 * offsets but for different queues */ 49 #define DST_QUEUE_OFF_BASE (1 << 30) 50 51 52 /** 53 * struct v4l2_m2m_dev - per-device context 54 * @curr_ctx: currently running instance 55 * @job_queue: instances queued to run 56 * @job_spinlock: protects job_queue 57 * @m2m_ops: driver callbacks 58 */ 59 struct v4l2_m2m_dev { 60 struct v4l2_m2m_ctx *curr_ctx; 61 62 struct list_head job_queue; 63 spinlock_t job_spinlock; 64 65 const struct v4l2_m2m_ops *m2m_ops; 66 }; 67 68 static struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx, 69 enum v4l2_buf_type type) 70 { 71 if (V4L2_TYPE_IS_OUTPUT(type)) 72 return &m2m_ctx->out_q_ctx; 73 else 74 return &m2m_ctx->cap_q_ctx; 75 } 76 77 /** 78 * v4l2_m2m_get_vq() - return vb2_queue for the given type 79 */ 80 struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx, 81 enum v4l2_buf_type type) 82 { 83 struct v4l2_m2m_queue_ctx *q_ctx; 84 85 q_ctx = get_queue_ctx(m2m_ctx, type); 86 if (!q_ctx) 87 return NULL; 88 89 return &q_ctx->q; 90 } 91 EXPORT_SYMBOL(v4l2_m2m_get_vq); 92 93 /** 94 * v4l2_m2m_next_buf() - return next buffer from the list of ready buffers 95 */ 96 void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx) 97 { 98 struct v4l2_m2m_buffer *b = NULL; 99 unsigned long flags; 100 101 spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); 102 103 if (list_empty(&q_ctx->rdy_queue)) { 104 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); 105 return NULL; 106 } 107 108 b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list); 109 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); 110 return &b->vb; 111 } 112 EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf); 113 114 /** 115 * v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and 116 * return it 117 */ 118 void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx) 119 { 120 struct v4l2_m2m_buffer *b = NULL; 121 unsigned long flags; 122 123 spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); 124 if (list_empty(&q_ctx->rdy_queue)) { 125 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); 126 return NULL; 127 } 128 b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list); 129 list_del(&b->list); 130 q_ctx->num_rdy--; 131 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); 132 133 return &b->vb; 134 } 135 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove); 136 137 /* 138 * Scheduling handlers 139 */ 140 141 /** 142 * v4l2_m2m_get_curr_priv() - return driver private data for the currently 143 * running instance or NULL if no instance is running 144 */ 145 void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev) 146 { 147 unsigned long flags; 148 void *ret = NULL; 149 150 spin_lock_irqsave(&m2m_dev->job_spinlock, flags); 151 if (m2m_dev->curr_ctx) 152 ret = m2m_dev->curr_ctx->priv; 153 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); 154 155 return ret; 156 } 157 EXPORT_SYMBOL(v4l2_m2m_get_curr_priv); 158 159 /** 160 * v4l2_m2m_try_run() - select next job to perform and run it if possible 161 * 162 * Get next transaction (if present) from the waiting jobs list and run it. 163 */ 164 static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev) 165 { 166 unsigned long flags; 167 168 spin_lock_irqsave(&m2m_dev->job_spinlock, flags); 169 if (NULL != m2m_dev->curr_ctx) { 170 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); 171 dprintk("Another instance is running, won't run now\n"); 172 return; 173 } 174 175 if (list_empty(&m2m_dev->job_queue)) { 176 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); 177 dprintk("No job pending\n"); 178 return; 179 } 180 181 m2m_dev->curr_ctx = list_first_entry(&m2m_dev->job_queue, 182 struct v4l2_m2m_ctx, queue); 183 m2m_dev->curr_ctx->job_flags |= TRANS_RUNNING; 184 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); 185 186 m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv); 187 } 188 189 /** 190 * v4l2_m2m_try_schedule() - check whether an instance is ready to be added to 191 * the pending job queue and add it if so. 192 * @m2m_ctx: m2m context assigned to the instance to be checked 193 * 194 * There are three basic requirements an instance has to meet to be able to run: 195 * 1) at least one source buffer has to be queued, 196 * 2) at least one destination buffer has to be queued, 197 * 3) streaming has to be on. 198 * 199 * There may also be additional, custom requirements. In such case the driver 200 * should supply a custom callback (job_ready in v4l2_m2m_ops) that should 201 * return 1 if the instance is ready. 202 * An example of the above could be an instance that requires more than one 203 * src/dst buffer per transaction. 204 */ 205 static void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx) 206 { 207 struct v4l2_m2m_dev *m2m_dev; 208 unsigned long flags_job, flags; 209 210 m2m_dev = m2m_ctx->m2m_dev; 211 dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx); 212 213 if (!m2m_ctx->out_q_ctx.q.streaming 214 || !m2m_ctx->cap_q_ctx.q.streaming) { 215 dprintk("Streaming needs to be on for both queues\n"); 216 return; 217 } 218 219 spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job); 220 if (m2m_ctx->job_flags & TRANS_QUEUED) { 221 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); 222 dprintk("On job queue already\n"); 223 return; 224 } 225 226 spin_lock_irqsave(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); 227 if (list_empty(&m2m_ctx->out_q_ctx.rdy_queue)) { 228 spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); 229 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); 230 dprintk("No input buffers available\n"); 231 return; 232 } 233 if (list_empty(&m2m_ctx->cap_q_ctx.rdy_queue)) { 234 spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); 235 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); 236 dprintk("No output buffers available\n"); 237 return; 238 } 239 spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); 240 241 if (m2m_dev->m2m_ops->job_ready 242 && (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) { 243 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); 244 dprintk("Driver not ready\n"); 245 return; 246 } 247 248 list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue); 249 m2m_ctx->job_flags |= TRANS_QUEUED; 250 251 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); 252 253 v4l2_m2m_try_run(m2m_dev); 254 } 255 256 /** 257 * v4l2_m2m_job_finish() - inform the framework that a job has been finished 258 * and have it clean up 259 * 260 * Called by a driver to yield back the device after it has finished with it. 261 * Should be called as soon as possible after reaching a state which allows 262 * other instances to take control of the device. 263 * 264 * This function has to be called only after device_run() callback has been 265 * called on the driver. To prevent recursion, it should not be called directly 266 * from the device_run() callback though. 267 */ 268 void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev, 269 struct v4l2_m2m_ctx *m2m_ctx) 270 { 271 unsigned long flags; 272 273 spin_lock_irqsave(&m2m_dev->job_spinlock, flags); 274 if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) { 275 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); 276 dprintk("Called by an instance not currently running\n"); 277 return; 278 } 279 280 list_del(&m2m_dev->curr_ctx->queue); 281 m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); 282 wake_up(&m2m_dev->curr_ctx->finished); 283 m2m_dev->curr_ctx = NULL; 284 285 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); 286 287 /* This instance might have more buffers ready, but since we do not 288 * allow more than one job on the job_queue per instance, each has 289 * to be scheduled separately after the previous one finishes. */ 290 v4l2_m2m_try_schedule(m2m_ctx); 291 v4l2_m2m_try_run(m2m_dev); 292 } 293 EXPORT_SYMBOL(v4l2_m2m_job_finish); 294 295 /** 296 * v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer 297 */ 298 int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 299 struct v4l2_requestbuffers *reqbufs) 300 { 301 struct vb2_queue *vq; 302 303 vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type); 304 return vb2_reqbufs(vq, reqbufs); 305 } 306 EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs); 307 308 /** 309 * v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer 310 * 311 * See v4l2_m2m_mmap() documentation for details. 312 */ 313 int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 314 struct v4l2_buffer *buf) 315 { 316 struct vb2_queue *vq; 317 int ret = 0; 318 unsigned int i; 319 320 vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); 321 ret = vb2_querybuf(vq, buf); 322 323 /* Adjust MMAP memory offsets for the CAPTURE queue */ 324 if (buf->memory == V4L2_MEMORY_MMAP && !V4L2_TYPE_IS_OUTPUT(vq->type)) { 325 if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) { 326 for (i = 0; i < buf->length; ++i) 327 buf->m.planes[i].m.mem_offset 328 += DST_QUEUE_OFF_BASE; 329 } else { 330 buf->m.offset += DST_QUEUE_OFF_BASE; 331 } 332 } 333 334 return ret; 335 } 336 EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf); 337 338 /** 339 * v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on 340 * the type 341 */ 342 int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 343 struct v4l2_buffer *buf) 344 { 345 struct vb2_queue *vq; 346 int ret; 347 348 vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); 349 ret = vb2_qbuf(vq, buf); 350 if (!ret) 351 v4l2_m2m_try_schedule(m2m_ctx); 352 353 return ret; 354 } 355 EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf); 356 357 /** 358 * v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on 359 * the type 360 */ 361 int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 362 struct v4l2_buffer *buf) 363 { 364 struct vb2_queue *vq; 365 366 vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); 367 return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK); 368 } 369 EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf); 370 371 /** 372 * v4l2_m2m_expbuf() - export a source or destination buffer, depending on 373 * the type 374 */ 375 int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 376 struct v4l2_exportbuffer *eb) 377 { 378 struct vb2_queue *vq; 379 380 vq = v4l2_m2m_get_vq(m2m_ctx, eb->type); 381 return vb2_expbuf(vq, eb); 382 } 383 EXPORT_SYMBOL_GPL(v4l2_m2m_expbuf); 384 /** 385 * v4l2_m2m_streamon() - turn on streaming for a video queue 386 */ 387 int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 388 enum v4l2_buf_type type) 389 { 390 struct vb2_queue *vq; 391 int ret; 392 393 vq = v4l2_m2m_get_vq(m2m_ctx, type); 394 ret = vb2_streamon(vq, type); 395 if (!ret) 396 v4l2_m2m_try_schedule(m2m_ctx); 397 398 return ret; 399 } 400 EXPORT_SYMBOL_GPL(v4l2_m2m_streamon); 401 402 /** 403 * v4l2_m2m_streamoff() - turn off streaming for a video queue 404 */ 405 int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 406 enum v4l2_buf_type type) 407 { 408 struct vb2_queue *vq; 409 410 vq = v4l2_m2m_get_vq(m2m_ctx, type); 411 return vb2_streamoff(vq, type); 412 } 413 EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff); 414 415 /** 416 * v4l2_m2m_poll() - poll replacement, for destination buffers only 417 * 418 * Call from the driver's poll() function. Will poll both queues. If a buffer 419 * is available to dequeue (with dqbuf) from the source queue, this will 420 * indicate that a non-blocking write can be performed, while read will be 421 * returned in case of the destination queue. 422 */ 423 unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 424 struct poll_table_struct *wait) 425 { 426 struct video_device *vfd = video_devdata(file); 427 unsigned long req_events = poll_requested_events(wait); 428 struct vb2_queue *src_q, *dst_q; 429 struct vb2_buffer *src_vb = NULL, *dst_vb = NULL; 430 unsigned int rc = 0; 431 unsigned long flags; 432 433 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { 434 struct v4l2_fh *fh = file->private_data; 435 436 if (v4l2_event_pending(fh)) 437 rc = POLLPRI; 438 else if (req_events & POLLPRI) 439 poll_wait(file, &fh->wait, wait); 440 if (!(req_events & (POLLOUT | POLLWRNORM | POLLIN | POLLRDNORM))) 441 return rc; 442 } 443 444 src_q = v4l2_m2m_get_src_vq(m2m_ctx); 445 dst_q = v4l2_m2m_get_dst_vq(m2m_ctx); 446 447 /* 448 * There has to be at least one buffer queued on each queued_list, which 449 * means either in driver already or waiting for driver to claim it 450 * and start processing. 451 */ 452 if ((!src_q->streaming || list_empty(&src_q->queued_list)) 453 && (!dst_q->streaming || list_empty(&dst_q->queued_list))) { 454 rc |= POLLERR; 455 goto end; 456 } 457 458 if (m2m_ctx->m2m_dev->m2m_ops->unlock) 459 m2m_ctx->m2m_dev->m2m_ops->unlock(m2m_ctx->priv); 460 461 poll_wait(file, &src_q->done_wq, wait); 462 poll_wait(file, &dst_q->done_wq, wait); 463 464 if (m2m_ctx->m2m_dev->m2m_ops->lock) 465 m2m_ctx->m2m_dev->m2m_ops->lock(m2m_ctx->priv); 466 467 spin_lock_irqsave(&src_q->done_lock, flags); 468 if (!list_empty(&src_q->done_list)) 469 src_vb = list_first_entry(&src_q->done_list, struct vb2_buffer, 470 done_entry); 471 if (src_vb && (src_vb->state == VB2_BUF_STATE_DONE 472 || src_vb->state == VB2_BUF_STATE_ERROR)) 473 rc |= POLLOUT | POLLWRNORM; 474 spin_unlock_irqrestore(&src_q->done_lock, flags); 475 476 spin_lock_irqsave(&dst_q->done_lock, flags); 477 if (!list_empty(&dst_q->done_list)) 478 dst_vb = list_first_entry(&dst_q->done_list, struct vb2_buffer, 479 done_entry); 480 if (dst_vb && (dst_vb->state == VB2_BUF_STATE_DONE 481 || dst_vb->state == VB2_BUF_STATE_ERROR)) 482 rc |= POLLIN | POLLRDNORM; 483 spin_unlock_irqrestore(&dst_q->done_lock, flags); 484 485 end: 486 return rc; 487 } 488 EXPORT_SYMBOL_GPL(v4l2_m2m_poll); 489 490 /** 491 * v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer 492 * 493 * Call from driver's mmap() function. Will handle mmap() for both queues 494 * seamlessly for videobuffer, which will receive normal per-queue offsets and 495 * proper videobuf queue pointers. The differentiation is made outside videobuf 496 * by adding a predefined offset to buffers from one of the queues and 497 * subtracting it before passing it back to videobuf. Only drivers (and 498 * thus applications) receive modified offsets. 499 */ 500 int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 501 struct vm_area_struct *vma) 502 { 503 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; 504 struct vb2_queue *vq; 505 506 if (offset < DST_QUEUE_OFF_BASE) { 507 vq = v4l2_m2m_get_src_vq(m2m_ctx); 508 } else { 509 vq = v4l2_m2m_get_dst_vq(m2m_ctx); 510 vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT); 511 } 512 513 return vb2_mmap(vq, vma); 514 } 515 EXPORT_SYMBOL(v4l2_m2m_mmap); 516 517 /** 518 * v4l2_m2m_init() - initialize per-driver m2m data 519 * 520 * Usually called from driver's probe() function. 521 */ 522 struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops) 523 { 524 struct v4l2_m2m_dev *m2m_dev; 525 526 if (!m2m_ops || WARN_ON(!m2m_ops->device_run) || 527 WARN_ON(!m2m_ops->job_abort)) 528 return ERR_PTR(-EINVAL); 529 530 m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL); 531 if (!m2m_dev) 532 return ERR_PTR(-ENOMEM); 533 534 m2m_dev->curr_ctx = NULL; 535 m2m_dev->m2m_ops = m2m_ops; 536 INIT_LIST_HEAD(&m2m_dev->job_queue); 537 spin_lock_init(&m2m_dev->job_spinlock); 538 539 return m2m_dev; 540 } 541 EXPORT_SYMBOL_GPL(v4l2_m2m_init); 542 543 /** 544 * v4l2_m2m_release() - cleans up and frees a m2m_dev structure 545 * 546 * Usually called from driver's remove() function. 547 */ 548 void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev) 549 { 550 kfree(m2m_dev); 551 } 552 EXPORT_SYMBOL_GPL(v4l2_m2m_release); 553 554 /** 555 * v4l2_m2m_ctx_init() - allocate and initialize a m2m context 556 * @priv - driver's instance private data 557 * @m2m_dev - a previously initialized m2m_dev struct 558 * @vq_init - a callback for queue type-specific initialization function to be 559 * used for initializing videobuf_queues 560 * 561 * Usually called from driver's open() function. 562 */ 563 struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev, 564 void *drv_priv, 565 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)) 566 { 567 struct v4l2_m2m_ctx *m2m_ctx; 568 struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx; 569 int ret; 570 571 m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL); 572 if (!m2m_ctx) 573 return ERR_PTR(-ENOMEM); 574 575 m2m_ctx->priv = drv_priv; 576 m2m_ctx->m2m_dev = m2m_dev; 577 init_waitqueue_head(&m2m_ctx->finished); 578 579 out_q_ctx = &m2m_ctx->out_q_ctx; 580 cap_q_ctx = &m2m_ctx->cap_q_ctx; 581 582 INIT_LIST_HEAD(&out_q_ctx->rdy_queue); 583 INIT_LIST_HEAD(&cap_q_ctx->rdy_queue); 584 spin_lock_init(&out_q_ctx->rdy_spinlock); 585 spin_lock_init(&cap_q_ctx->rdy_spinlock); 586 587 INIT_LIST_HEAD(&m2m_ctx->queue); 588 589 ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q); 590 591 if (ret) 592 goto err; 593 594 return m2m_ctx; 595 err: 596 kfree(m2m_ctx); 597 return ERR_PTR(ret); 598 } 599 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init); 600 601 /** 602 * v4l2_m2m_ctx_release() - release m2m context 603 * 604 * Usually called from driver's release() function. 605 */ 606 void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx) 607 { 608 struct v4l2_m2m_dev *m2m_dev; 609 unsigned long flags; 610 611 m2m_dev = m2m_ctx->m2m_dev; 612 613 spin_lock_irqsave(&m2m_dev->job_spinlock, flags); 614 if (m2m_ctx->job_flags & TRANS_RUNNING) { 615 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); 616 m2m_dev->m2m_ops->job_abort(m2m_ctx->priv); 617 dprintk("m2m_ctx %p running, will wait to complete", m2m_ctx); 618 wait_event(m2m_ctx->finished, !(m2m_ctx->job_flags & TRANS_RUNNING)); 619 } else if (m2m_ctx->job_flags & TRANS_QUEUED) { 620 list_del(&m2m_ctx->queue); 621 m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); 622 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); 623 dprintk("m2m_ctx: %p had been on queue and was removed\n", 624 m2m_ctx); 625 } else { 626 /* Do nothing, was not on queue/running */ 627 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); 628 } 629 630 vb2_queue_release(&m2m_ctx->cap_q_ctx.q); 631 vb2_queue_release(&m2m_ctx->out_q_ctx.q); 632 633 kfree(m2m_ctx); 634 } 635 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release); 636 637 /** 638 * v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list. 639 * 640 * Call from buf_queue(), videobuf_queue_ops callback. 641 */ 642 void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb) 643 { 644 struct v4l2_m2m_buffer *b = container_of(vb, struct v4l2_m2m_buffer, vb); 645 struct v4l2_m2m_queue_ctx *q_ctx; 646 unsigned long flags; 647 648 q_ctx = get_queue_ctx(m2m_ctx, vb->vb2_queue->type); 649 if (!q_ctx) 650 return; 651 652 spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); 653 list_add_tail(&b->list, &q_ctx->rdy_queue); 654 q_ctx->num_rdy++; 655 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); 656 } 657 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue); 658 659