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 spin_lock_irqsave(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags); 234 if (list_empty(&m2m_ctx->cap_q_ctx.rdy_queue)) { 235 spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags); 236 spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); 237 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); 238 dprintk("No output buffers available\n"); 239 return; 240 } 241 spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags); 242 spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags); 243 244 if (m2m_dev->m2m_ops->job_ready 245 && (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) { 246 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); 247 dprintk("Driver not ready\n"); 248 return; 249 } 250 251 list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue); 252 m2m_ctx->job_flags |= TRANS_QUEUED; 253 254 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); 255 256 v4l2_m2m_try_run(m2m_dev); 257 } 258 259 /** 260 * v4l2_m2m_job_finish() - inform the framework that a job has been finished 261 * and have it clean up 262 * 263 * Called by a driver to yield back the device after it has finished with it. 264 * Should be called as soon as possible after reaching a state which allows 265 * other instances to take control of the device. 266 * 267 * This function has to be called only after device_run() callback has been 268 * called on the driver. To prevent recursion, it should not be called directly 269 * from the device_run() callback though. 270 */ 271 void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev, 272 struct v4l2_m2m_ctx *m2m_ctx) 273 { 274 unsigned long flags; 275 276 spin_lock_irqsave(&m2m_dev->job_spinlock, flags); 277 if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) { 278 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); 279 dprintk("Called by an instance not currently running\n"); 280 return; 281 } 282 283 list_del(&m2m_dev->curr_ctx->queue); 284 m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); 285 wake_up(&m2m_dev->curr_ctx->finished); 286 m2m_dev->curr_ctx = NULL; 287 288 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); 289 290 /* This instance might have more buffers ready, but since we do not 291 * allow more than one job on the job_queue per instance, each has 292 * to be scheduled separately after the previous one finishes. */ 293 v4l2_m2m_try_schedule(m2m_ctx); 294 v4l2_m2m_try_run(m2m_dev); 295 } 296 EXPORT_SYMBOL(v4l2_m2m_job_finish); 297 298 /** 299 * v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer 300 */ 301 int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 302 struct v4l2_requestbuffers *reqbufs) 303 { 304 struct vb2_queue *vq; 305 306 vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type); 307 return vb2_reqbufs(vq, reqbufs); 308 } 309 EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs); 310 311 /** 312 * v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer 313 * 314 * See v4l2_m2m_mmap() documentation for details. 315 */ 316 int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 317 struct v4l2_buffer *buf) 318 { 319 struct vb2_queue *vq; 320 int ret = 0; 321 unsigned int i; 322 323 vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); 324 ret = vb2_querybuf(vq, buf); 325 326 /* Adjust MMAP memory offsets for the CAPTURE queue */ 327 if (buf->memory == V4L2_MEMORY_MMAP && !V4L2_TYPE_IS_OUTPUT(vq->type)) { 328 if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) { 329 for (i = 0; i < buf->length; ++i) 330 buf->m.planes[i].m.mem_offset 331 += DST_QUEUE_OFF_BASE; 332 } else { 333 buf->m.offset += DST_QUEUE_OFF_BASE; 334 } 335 } 336 337 return ret; 338 } 339 EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf); 340 341 /** 342 * v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on 343 * the type 344 */ 345 int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 346 struct v4l2_buffer *buf) 347 { 348 struct vb2_queue *vq; 349 int ret; 350 351 vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); 352 ret = vb2_qbuf(vq, buf); 353 if (!ret) 354 v4l2_m2m_try_schedule(m2m_ctx); 355 356 return ret; 357 } 358 EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf); 359 360 /** 361 * v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on 362 * the type 363 */ 364 int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 365 struct v4l2_buffer *buf) 366 { 367 struct vb2_queue *vq; 368 369 vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); 370 return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK); 371 } 372 EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf); 373 374 /** 375 * v4l2_m2m_expbuf() - export a source or destination buffer, depending on 376 * the type 377 */ 378 int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 379 struct v4l2_exportbuffer *eb) 380 { 381 struct vb2_queue *vq; 382 383 vq = v4l2_m2m_get_vq(m2m_ctx, eb->type); 384 return vb2_expbuf(vq, eb); 385 } 386 EXPORT_SYMBOL_GPL(v4l2_m2m_expbuf); 387 /** 388 * v4l2_m2m_streamon() - turn on streaming for a video queue 389 */ 390 int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 391 enum v4l2_buf_type type) 392 { 393 struct vb2_queue *vq; 394 int ret; 395 396 vq = v4l2_m2m_get_vq(m2m_ctx, type); 397 ret = vb2_streamon(vq, type); 398 if (!ret) 399 v4l2_m2m_try_schedule(m2m_ctx); 400 401 return ret; 402 } 403 EXPORT_SYMBOL_GPL(v4l2_m2m_streamon); 404 405 /** 406 * v4l2_m2m_streamoff() - turn off streaming for a video queue 407 */ 408 int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 409 enum v4l2_buf_type type) 410 { 411 struct v4l2_m2m_dev *m2m_dev; 412 struct v4l2_m2m_queue_ctx *q_ctx; 413 unsigned long flags_job, flags; 414 int ret; 415 416 q_ctx = get_queue_ctx(m2m_ctx, type); 417 ret = vb2_streamoff(&q_ctx->q, type); 418 if (ret) 419 return ret; 420 421 m2m_dev = m2m_ctx->m2m_dev; 422 spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job); 423 /* We should not be scheduled anymore, since we're dropping a queue. */ 424 INIT_LIST_HEAD(&m2m_ctx->queue); 425 m2m_ctx->job_flags = 0; 426 427 spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); 428 /* Drop queue, since streamoff returns device to the same state as after 429 * calling reqbufs. */ 430 INIT_LIST_HEAD(&q_ctx->rdy_queue); 431 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); 432 433 if (m2m_dev->curr_ctx == m2m_ctx) { 434 m2m_dev->curr_ctx = NULL; 435 wake_up(&m2m_ctx->finished); 436 } 437 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); 438 439 return 0; 440 } 441 EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff); 442 443 /** 444 * v4l2_m2m_poll() - poll replacement, for destination buffers only 445 * 446 * Call from the driver's poll() function. Will poll both queues. If a buffer 447 * is available to dequeue (with dqbuf) from the source queue, this will 448 * indicate that a non-blocking write can be performed, while read will be 449 * returned in case of the destination queue. 450 */ 451 unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 452 struct poll_table_struct *wait) 453 { 454 struct video_device *vfd = video_devdata(file); 455 unsigned long req_events = poll_requested_events(wait); 456 struct vb2_queue *src_q, *dst_q; 457 struct vb2_buffer *src_vb = NULL, *dst_vb = NULL; 458 unsigned int rc = 0; 459 unsigned long flags; 460 461 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { 462 struct v4l2_fh *fh = file->private_data; 463 464 if (v4l2_event_pending(fh)) 465 rc = POLLPRI; 466 else if (req_events & POLLPRI) 467 poll_wait(file, &fh->wait, wait); 468 if (!(req_events & (POLLOUT | POLLWRNORM | POLLIN | POLLRDNORM))) 469 return rc; 470 } 471 472 src_q = v4l2_m2m_get_src_vq(m2m_ctx); 473 dst_q = v4l2_m2m_get_dst_vq(m2m_ctx); 474 475 /* 476 * There has to be at least one buffer queued on each queued_list, which 477 * means either in driver already or waiting for driver to claim it 478 * and start processing. 479 */ 480 if ((!src_q->streaming || list_empty(&src_q->queued_list)) 481 && (!dst_q->streaming || list_empty(&dst_q->queued_list))) { 482 rc |= POLLERR; 483 goto end; 484 } 485 486 if (m2m_ctx->m2m_dev->m2m_ops->unlock) 487 m2m_ctx->m2m_dev->m2m_ops->unlock(m2m_ctx->priv); 488 489 poll_wait(file, &src_q->done_wq, wait); 490 poll_wait(file, &dst_q->done_wq, wait); 491 492 if (m2m_ctx->m2m_dev->m2m_ops->lock) 493 m2m_ctx->m2m_dev->m2m_ops->lock(m2m_ctx->priv); 494 495 spin_lock_irqsave(&src_q->done_lock, flags); 496 if (!list_empty(&src_q->done_list)) 497 src_vb = list_first_entry(&src_q->done_list, struct vb2_buffer, 498 done_entry); 499 if (src_vb && (src_vb->state == VB2_BUF_STATE_DONE 500 || src_vb->state == VB2_BUF_STATE_ERROR)) 501 rc |= POLLOUT | POLLWRNORM; 502 spin_unlock_irqrestore(&src_q->done_lock, flags); 503 504 spin_lock_irqsave(&dst_q->done_lock, flags); 505 if (!list_empty(&dst_q->done_list)) 506 dst_vb = list_first_entry(&dst_q->done_list, struct vb2_buffer, 507 done_entry); 508 if (dst_vb && (dst_vb->state == VB2_BUF_STATE_DONE 509 || dst_vb->state == VB2_BUF_STATE_ERROR)) 510 rc |= POLLIN | POLLRDNORM; 511 spin_unlock_irqrestore(&dst_q->done_lock, flags); 512 513 end: 514 return rc; 515 } 516 EXPORT_SYMBOL_GPL(v4l2_m2m_poll); 517 518 /** 519 * v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer 520 * 521 * Call from driver's mmap() function. Will handle mmap() for both queues 522 * seamlessly for videobuffer, which will receive normal per-queue offsets and 523 * proper videobuf queue pointers. The differentiation is made outside videobuf 524 * by adding a predefined offset to buffers from one of the queues and 525 * subtracting it before passing it back to videobuf. Only drivers (and 526 * thus applications) receive modified offsets. 527 */ 528 int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, 529 struct vm_area_struct *vma) 530 { 531 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; 532 struct vb2_queue *vq; 533 534 if (offset < DST_QUEUE_OFF_BASE) { 535 vq = v4l2_m2m_get_src_vq(m2m_ctx); 536 } else { 537 vq = v4l2_m2m_get_dst_vq(m2m_ctx); 538 vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT); 539 } 540 541 return vb2_mmap(vq, vma); 542 } 543 EXPORT_SYMBOL(v4l2_m2m_mmap); 544 545 /** 546 * v4l2_m2m_init() - initialize per-driver m2m data 547 * 548 * Usually called from driver's probe() function. 549 */ 550 struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops) 551 { 552 struct v4l2_m2m_dev *m2m_dev; 553 554 if (!m2m_ops || WARN_ON(!m2m_ops->device_run) || 555 WARN_ON(!m2m_ops->job_abort)) 556 return ERR_PTR(-EINVAL); 557 558 m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL); 559 if (!m2m_dev) 560 return ERR_PTR(-ENOMEM); 561 562 m2m_dev->curr_ctx = NULL; 563 m2m_dev->m2m_ops = m2m_ops; 564 INIT_LIST_HEAD(&m2m_dev->job_queue); 565 spin_lock_init(&m2m_dev->job_spinlock); 566 567 return m2m_dev; 568 } 569 EXPORT_SYMBOL_GPL(v4l2_m2m_init); 570 571 /** 572 * v4l2_m2m_release() - cleans up and frees a m2m_dev structure 573 * 574 * Usually called from driver's remove() function. 575 */ 576 void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev) 577 { 578 kfree(m2m_dev); 579 } 580 EXPORT_SYMBOL_GPL(v4l2_m2m_release); 581 582 /** 583 * v4l2_m2m_ctx_init() - allocate and initialize a m2m context 584 * @priv - driver's instance private data 585 * @m2m_dev - a previously initialized m2m_dev struct 586 * @vq_init - a callback for queue type-specific initialization function to be 587 * used for initializing videobuf_queues 588 * 589 * Usually called from driver's open() function. 590 */ 591 struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev, 592 void *drv_priv, 593 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)) 594 { 595 struct v4l2_m2m_ctx *m2m_ctx; 596 struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx; 597 int ret; 598 599 m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL); 600 if (!m2m_ctx) 601 return ERR_PTR(-ENOMEM); 602 603 m2m_ctx->priv = drv_priv; 604 m2m_ctx->m2m_dev = m2m_dev; 605 init_waitqueue_head(&m2m_ctx->finished); 606 607 out_q_ctx = &m2m_ctx->out_q_ctx; 608 cap_q_ctx = &m2m_ctx->cap_q_ctx; 609 610 INIT_LIST_HEAD(&out_q_ctx->rdy_queue); 611 INIT_LIST_HEAD(&cap_q_ctx->rdy_queue); 612 spin_lock_init(&out_q_ctx->rdy_spinlock); 613 spin_lock_init(&cap_q_ctx->rdy_spinlock); 614 615 INIT_LIST_HEAD(&m2m_ctx->queue); 616 617 ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q); 618 619 if (ret) 620 goto err; 621 622 return m2m_ctx; 623 err: 624 kfree(m2m_ctx); 625 return ERR_PTR(ret); 626 } 627 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init); 628 629 /** 630 * v4l2_m2m_ctx_release() - release m2m context 631 * 632 * Usually called from driver's release() function. 633 */ 634 void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx) 635 { 636 struct v4l2_m2m_dev *m2m_dev; 637 unsigned long flags; 638 639 m2m_dev = m2m_ctx->m2m_dev; 640 641 spin_lock_irqsave(&m2m_dev->job_spinlock, flags); 642 if (m2m_ctx->job_flags & TRANS_RUNNING) { 643 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); 644 m2m_dev->m2m_ops->job_abort(m2m_ctx->priv); 645 dprintk("m2m_ctx %p running, will wait to complete", m2m_ctx); 646 wait_event(m2m_ctx->finished, !(m2m_ctx->job_flags & TRANS_RUNNING)); 647 } else if (m2m_ctx->job_flags & TRANS_QUEUED) { 648 list_del(&m2m_ctx->queue); 649 m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); 650 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); 651 dprintk("m2m_ctx: %p had been on queue and was removed\n", 652 m2m_ctx); 653 } else { 654 /* Do nothing, was not on queue/running */ 655 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); 656 } 657 658 vb2_queue_release(&m2m_ctx->cap_q_ctx.q); 659 vb2_queue_release(&m2m_ctx->out_q_ctx.q); 660 661 kfree(m2m_ctx); 662 } 663 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release); 664 665 /** 666 * v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list. 667 * 668 * Call from buf_queue(), videobuf_queue_ops callback. 669 */ 670 void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb) 671 { 672 struct v4l2_m2m_buffer *b = container_of(vb, struct v4l2_m2m_buffer, vb); 673 struct v4l2_m2m_queue_ctx *q_ctx; 674 unsigned long flags; 675 676 q_ctx = get_queue_ctx(m2m_ctx, vb->vb2_queue->type); 677 if (!q_ctx) 678 return; 679 680 spin_lock_irqsave(&q_ctx->rdy_spinlock, flags); 681 list_add_tail(&b->list, &q_ctx->rdy_queue); 682 q_ctx->num_rdy++; 683 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags); 684 } 685 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue); 686 687