drivers/media/v4l2-core/v4l2-mem2mem.c

   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, <[email protected]>
   9  * Marek Szyprowski, <[email protected]>
  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/media-device.h>
  21 #include <media/videobuf2-v4l2.h>
  22 #include <media/v4l2-mem2mem.h>
  23 #include <media/v4l2-dev.h>
  24 #include <media/v4l2-device.h>
  25 #include <media/v4l2-fh.h>
  26 #include <media/v4l2-event.h>
  27
  28 MODULE_DESCRIPTION("Mem to mem device framework for videobuf");
  29 MODULE_AUTHOR("Pawel Osciak, <[email protected]>");
  30 MODULE_LICENSE("GPL");
  31
  32 static bool debug;
  33 module_param(debug, bool, 0644);
  34
  35 #define dprintk(fmt, arg...)                                            \
  36         do {                                                            \
  37                 if (debug)                                              \
  38                         printk(KERN_DEBUG "%s: " fmt, __func__, ## arg);\
  39         } while (0)
  40
  41
  42 /* Instance is already queued on the job_queue */
  43 #define TRANS_QUEUED            (1 << 0)
  44 /* Instance is currently running in hardware */
  45 #define TRANS_RUNNING           (1 << 1)
  46 /* Instance is currently aborting */
  47 #define TRANS_ABORT             (1 << 2)
  48
  49
  50 /* Offset base for buffers on the destination queue - used to distinguish
  51  * between source and destination buffers when mmapping - they receive the same
  52  * offsets but for different queues */
  53 #define DST_QUEUE_OFF_BASE      (1 << 30)
  54
  55 enum v4l2_m2m_entity_type {
  56         MEM2MEM_ENT_TYPE_SOURCE,
  57         MEM2MEM_ENT_TYPE_SINK,
  58         MEM2MEM_ENT_TYPE_PROC
  59 };
  60
  61 static const char * const m2m_entity_name[] = {
  62         "source",
  63         "sink",
  64         "proc"
  65 };
  66
  67 /**
  68  * struct v4l2_m2m_dev - per-device context
  69  * @source:             &struct media_entity pointer with the source entity
  70  *                      Used only when the M2M device is registered via
  71  *                      v4l2_m2m_unregister_media_controller().
  72  * @source_pad:         &struct media_pad with the source pad.
  73  *                      Used only when the M2M device is registered via
  74  *                      v4l2_m2m_unregister_media_controller().
  75  * @sink:               &struct media_entity pointer with the sink entity
  76  *                      Used only when the M2M device is registered via
  77  *                      v4l2_m2m_unregister_media_controller().
  78  * @sink_pad:           &struct media_pad with the sink pad.
  79  *                      Used only when the M2M device is registered via
  80  *                      v4l2_m2m_unregister_media_controller().
  81  * @proc:               &struct media_entity pointer with the M2M device itself.
  82  * @proc_pads:          &struct media_pad with the @proc pads.
  83  *                      Used only when the M2M device is registered via
  84  *                      v4l2_m2m_unregister_media_controller().
  85  * @intf_devnode:       &struct media_intf devnode pointer with the interface
  86  *                      with controls the M2M device.
  87  * @curr_ctx:           currently running instance
  88  * @job_queue:          instances queued to run
  89  * @job_spinlock:       protects job_queue
  90  * @m2m_ops:            driver callbacks
  91  */
  92 struct v4l2_m2m_dev {
  93         struct v4l2_m2m_ctx     *curr_ctx;
  94 #ifdef CONFIG_MEDIA_CONTROLLER
  95         struct media_entity     *source;
  96         struct media_pad        source_pad;
  97         struct media_entity     sink;
  98         struct media_pad        sink_pad;
  99         struct media_entity     proc;
 100         struct media_pad        proc_pads[2];
 101         struct media_intf_devnode *intf_devnode;
 102 #endif
 103
 104         struct list_head        job_queue;
 105         spinlock_t              job_spinlock;
 106
 107         const struct v4l2_m2m_ops *m2m_ops;
 108 };
 109
 110 static struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx,
 111                                                 enum v4l2_buf_type type)
 112 {
 113         if (V4L2_TYPE_IS_OUTPUT(type))
 114                 return &m2m_ctx->out_q_ctx;
 115         else
 116                 return &m2m_ctx->cap_q_ctx;
 117 }
 118
 119 struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
 120                                        enum v4l2_buf_type type)
 121 {
 122         struct v4l2_m2m_queue_ctx *q_ctx;
 123
 124         q_ctx = get_queue_ctx(m2m_ctx, type);
 125         if (!q_ctx)
 126                 return NULL;
 127
 128         return &q_ctx->q;
 129 }
 130 EXPORT_SYMBOL(v4l2_m2m_get_vq);
 131
 132 void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx)
 133 {
 134         struct v4l2_m2m_buffer *b;
 135         unsigned long flags;
 136
 137         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 138
 139         if (list_empty(&q_ctx->rdy_queue)) {
 140                 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 141                 return NULL;
 142         }
 143
 144         b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
 145         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 146         return &b->vb;
 147 }
 148 EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf);
 149
 150 void *v4l2_m2m_last_buf(struct v4l2_m2m_queue_ctx *q_ctx)
 151 {
 152         struct v4l2_m2m_buffer *b;
 153         unsigned long flags;
 154
 155         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 156
 157         if (list_empty(&q_ctx->rdy_queue)) {
 158                 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 159                 return NULL;
 160         }
 161
 162         b = list_last_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
 163         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 164         return &b->vb;
 165 }
 166 EXPORT_SYMBOL_GPL(v4l2_m2m_last_buf);
 167
 168 void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx)
 169 {
 170         struct v4l2_m2m_buffer *b;
 171         unsigned long flags;
 172
 173         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 174         if (list_empty(&q_ctx->rdy_queue)) {
 175                 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 176                 return NULL;
 177         }
 178         b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
 179         list_del(&b->list);
 180         q_ctx->num_rdy--;
 181         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 182
 183         return &b->vb;
 184 }
 185 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove);
 186
 187 void v4l2_m2m_buf_remove_by_buf(struct v4l2_m2m_queue_ctx *q_ctx,
 188                                 struct vb2_v4l2_buffer *vbuf)
 189 {
 190         struct v4l2_m2m_buffer *b;
 191         unsigned long flags;
 192
 193         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 194         b = container_of(vbuf, struct v4l2_m2m_buffer, vb);
 195         list_del(&b->list);
 196         q_ctx->num_rdy--;
 197         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 198 }
 199 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove_by_buf);
 200
 201 struct vb2_v4l2_buffer *
 202 v4l2_m2m_buf_remove_by_idx(struct v4l2_m2m_queue_ctx *q_ctx, unsigned int idx)
 203
 204 {
 205         struct v4l2_m2m_buffer *b, *tmp;
 206         struct vb2_v4l2_buffer *ret = NULL;
 207         unsigned long flags;
 208
 209         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 210         list_for_each_entry_safe(b, tmp, &q_ctx->rdy_queue, list) {
 211                 if (b->vb.vb2_buf.index == idx) {
 212                         list_del(&b->list);
 213                         q_ctx->num_rdy--;
 214                         ret = &b->vb;
 215                         break;
 216                 }
 217         }
 218         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 219
 220         return ret;
 221 }
 222 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove_by_idx);
 223
 224 /*
 225  * Scheduling handlers
 226  */
 227
 228 void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev)
 229 {
 230         unsigned long flags;
 231         void *ret = NULL;
 232
 233         spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
 234         if (m2m_dev->curr_ctx)
 235                 ret = m2m_dev->curr_ctx->priv;
 236         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 237
 238         return ret;
 239 }
 240 EXPORT_SYMBOL(v4l2_m2m_get_curr_priv);
 241
 242 /**
 243  * v4l2_m2m_try_run() - select next job to perform and run it if possible
 244  * @m2m_dev: per-device context
 245  *
 246  * Get next transaction (if present) from the waiting jobs list and run it.
 247  */
 248 static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev)
 249 {
 250         unsigned long flags;
 251
 252         spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
 253         if (NULL != m2m_dev->curr_ctx) {
 254                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 255                 dprintk("Another instance is running, won't run now\n");
 256                 return;
 257         }
 258
 259         if (list_empty(&m2m_dev->job_queue)) {
 260                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 261                 dprintk("No job pending\n");
 262                 return;
 263         }
 264
 265         m2m_dev->curr_ctx = list_first_entry(&m2m_dev->job_queue,
 266                                    struct v4l2_m2m_ctx, queue);
 267         m2m_dev->curr_ctx->job_flags |= TRANS_RUNNING;
 268         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 269
 270         dprintk("Running job on m2m_ctx: %p\n", m2m_dev->curr_ctx);
 271         m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv);
 272 }
 273
 274 /*
 275  * __v4l2_m2m_try_queue() - queue a job
 276  * @m2m_dev: m2m device
 277  * @m2m_ctx: m2m context
 278  *
 279  * Check if this context is ready to queue a job.
 280  *
 281  * This function can run in interrupt context.
 282  */
 283 static void __v4l2_m2m_try_queue(struct v4l2_m2m_dev *m2m_dev,
 284                                  struct v4l2_m2m_ctx *m2m_ctx)
 285 {
 286         unsigned long flags_job, flags_out, flags_cap;
 287
 288         dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx);
 289
 290         if (!m2m_ctx->out_q_ctx.q.streaming
 291             || !m2m_ctx->cap_q_ctx.q.streaming) {
 292                 dprintk("Streaming needs to be on for both queues\n");
 293                 return;
 294         }
 295
 296         spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
 297
 298         /* If the context is aborted then don't schedule it */
 299         if (m2m_ctx->job_flags & TRANS_ABORT) {
 300                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
 301                 dprintk("Aborted context\n");
 302                 return;
 303         }
 304
 305         if (m2m_ctx->job_flags & TRANS_QUEUED) {
 306                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
 307                 dprintk("On job queue already\n");
 308                 return;
 309         }
 310
 311         spin_lock_irqsave(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out);
 312         if (list_empty(&m2m_ctx->out_q_ctx.rdy_queue)
 313             && !m2m_ctx->out_q_ctx.buffered) {
 314                 spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock,
 315                                         flags_out);
 316                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
 317                 dprintk("No input buffers available\n");
 318                 return;
 319         }
 320         spin_lock_irqsave(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap);
 321         if (list_empty(&m2m_ctx->cap_q_ctx.rdy_queue)
 322             && !m2m_ctx->cap_q_ctx.buffered) {
 323                 spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock,
 324                                         flags_cap);
 325                 spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock,
 326                                         flags_out);
 327                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
 328                 dprintk("No output buffers available\n");
 329                 return;
 330         }
 331         spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap);
 332         spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out);
 333
 334         if (m2m_dev->m2m_ops->job_ready
 335                 && (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) {
 336                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
 337                 dprintk("Driver not ready\n");
 338                 return;
 339         }
 340
 341         list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue);
 342         m2m_ctx->job_flags |= TRANS_QUEUED;
 343
 344         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
 345 }
 346
 347 /**
 348  * v4l2_m2m_try_schedule() - schedule and possibly run a job for any context
 349  * @m2m_ctx: m2m context
 350  *
 351  * Check if this context is ready to queue a job. If suitable,
 352  * run the next queued job on the mem2mem device.
 353  *
 354  * This function shouldn't run in interrupt context.
 355  *
 356  * Note that v4l2_m2m_try_schedule() can schedule one job for this context,
 357  * and then run another job for another context.
 358  */
 359 void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx)
 360 {
 361         struct v4l2_m2m_dev *m2m_dev = m2m_ctx->m2m_dev;
 362
 363         __v4l2_m2m_try_queue(m2m_dev, m2m_ctx);
 364         v4l2_m2m_try_run(m2m_dev);
 365 }
 366 EXPORT_SYMBOL_GPL(v4l2_m2m_try_schedule);
 367
 368 /**
 369  * v4l2_m2m_cancel_job() - cancel pending jobs for the context
 370  * @m2m_ctx: m2m context with jobs to be canceled
 371  *
 372  * In case of streamoff or release called on any context,
 373  * 1] If the context is currently running, then abort job will be called
 374  * 2] If the context is queued, then the context will be removed from
 375  *    the job_queue
 376  */
 377 static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx *m2m_ctx)
 378 {
 379         struct v4l2_m2m_dev *m2m_dev;
 380         unsigned long flags;
 381
 382         m2m_dev = m2m_ctx->m2m_dev;
 383         spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
 384
 385         m2m_ctx->job_flags |= TRANS_ABORT;
 386         if (m2m_ctx->job_flags & TRANS_RUNNING) {
 387                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 388                 if (m2m_dev->m2m_ops->job_abort)
 389                         m2m_dev->m2m_ops->job_abort(m2m_ctx->priv);
 390                 dprintk("m2m_ctx %p running, will wait to complete\n", m2m_ctx);
 391                 wait_event(m2m_ctx->finished,
 392                                 !(m2m_ctx->job_flags & TRANS_RUNNING));
 393         } else if (m2m_ctx->job_flags & TRANS_QUEUED) {
 394                 list_del(&m2m_ctx->queue);
 395                 m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
 396                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 397                 dprintk("m2m_ctx: %p had been on queue and was removed\n",
 398                         m2m_ctx);
 399         } else {
 400                 /* Do nothing, was not on queue/running */
 401                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 402         }
 403 }
 404
 405 void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
 406                          struct v4l2_m2m_ctx *m2m_ctx)
 407 {
 408         unsigned long flags;
 409
 410         spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
 411         if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) {
 412                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 413                 dprintk("Called by an instance not currently running\n");
 414                 return;
 415         }
 416
 417         list_del(&m2m_dev->curr_ctx->queue);
 418         m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
 419         wake_up(&m2m_dev->curr_ctx->finished);
 420         m2m_dev->curr_ctx = NULL;
 421
 422         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 423
 424         /* This instance might have more buffers ready, but since we do not
 425          * allow more than one job on the job_queue per instance, each has
 426          * to be scheduled separately after the previous one finishes. */
 427         v4l2_m2m_try_schedule(m2m_ctx);
 428 }
 429 EXPORT_SYMBOL(v4l2_m2m_job_finish);
 430
 431 int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 432                      struct v4l2_requestbuffers *reqbufs)
 433 {
 434         struct vb2_queue *vq;
 435         int ret;
 436
 437         vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type);
 438         ret = vb2_reqbufs(vq, reqbufs);
 439         /* If count == 0, then the owner has released all buffers and he
 440            is no longer owner of the queue. Otherwise we have an owner. */
 441         if (ret == 0)
 442                 vq->owner = reqbufs->count ? file->private_data : NULL;
 443
 444         return ret;
 445 }
 446 EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs);
 447
 448 int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 449                       struct v4l2_buffer *buf)
 450 {
 451         struct vb2_queue *vq;
 452         int ret = 0;
 453         unsigned int i;
 454
 455         vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
 456         ret = vb2_querybuf(vq, buf);
 457
 458         /* Adjust MMAP memory offsets for the CAPTURE queue */
 459         if (buf->memory == V4L2_MEMORY_MMAP && !V4L2_TYPE_IS_OUTPUT(vq->type)) {
 460                 if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) {
 461                         for (i = 0; i < buf->length; ++i)
 462                                 buf->m.planes[i].m.mem_offset
 463                                         += DST_QUEUE_OFF_BASE;
 464                 } else {
 465                         buf->m.offset += DST_QUEUE_OFF_BASE;
 466                 }
 467         }
 468
 469         return ret;
 470 }
 471 EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf);
 472
 473 int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 474                   struct v4l2_buffer *buf)
 475 {
 476         struct video_device *vdev = video_devdata(file);
 477         struct vb2_queue *vq;
 478         int ret;
 479
 480         vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
 481         if (!V4L2_TYPE_IS_OUTPUT(vq->type) &&
 482             (buf->flags & V4L2_BUF_FLAG_REQUEST_FD)) {
 483                 dprintk("%s: requests cannot be used with capture buffers\n",
 484                         __func__);
 485                 return -EPERM;
 486         }
 487         ret = vb2_qbuf(vq, vdev->v4l2_dev->mdev, buf);
 488         if (!ret && !(buf->flags & V4L2_BUF_FLAG_IN_REQUEST))
 489                 v4l2_m2m_try_schedule(m2m_ctx);
 490
 491         return ret;
 492 }
 493 EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf);
 494
 495 int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 496                    struct v4l2_buffer *buf)
 497 {
 498         struct vb2_queue *vq;
 499
 500         vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
 501         return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK);
 502 }
 503 EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf);
 504
 505 int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 506                          struct v4l2_buffer *buf)
 507 {
 508         struct video_device *vdev = video_devdata(file);
 509         struct vb2_queue *vq;
 510
 511         vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
 512         return vb2_prepare_buf(vq, vdev->v4l2_dev->mdev, buf);
 513 }
 514 EXPORT_SYMBOL_GPL(v4l2_m2m_prepare_buf);
 515
 516 int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 517                          struct v4l2_create_buffers *create)
 518 {
 519         struct vb2_queue *vq;
 520
 521         vq = v4l2_m2m_get_vq(m2m_ctx, create->format.type);
 522         return vb2_create_bufs(vq, create);
 523 }
 524 EXPORT_SYMBOL_GPL(v4l2_m2m_create_bufs);
 525
 526 int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 527                   struct v4l2_exportbuffer *eb)
 528 {
 529         struct vb2_queue *vq;
 530
 531         vq = v4l2_m2m_get_vq(m2m_ctx, eb->type);
 532         return vb2_expbuf(vq, eb);
 533 }
 534 EXPORT_SYMBOL_GPL(v4l2_m2m_expbuf);
 535
 536 int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 537                       enum v4l2_buf_type type)
 538 {
 539         struct vb2_queue *vq;
 540         int ret;
 541
 542         vq = v4l2_m2m_get_vq(m2m_ctx, type);
 543         ret = vb2_streamon(vq, type);
 544         if (!ret)
 545                 v4l2_m2m_try_schedule(m2m_ctx);
 546
 547         return ret;
 548 }
 549 EXPORT_SYMBOL_GPL(v4l2_m2m_streamon);
 550
 551 int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 552                        enum v4l2_buf_type type)
 553 {
 554         struct v4l2_m2m_dev *m2m_dev;
 555         struct v4l2_m2m_queue_ctx *q_ctx;
 556         unsigned long flags_job, flags;
 557         int ret;
 558
 559         /* wait until the current context is dequeued from job_queue */
 560         v4l2_m2m_cancel_job(m2m_ctx);
 561
 562         q_ctx = get_queue_ctx(m2m_ctx, type);
 563         ret = vb2_streamoff(&q_ctx->q, type);
 564         if (ret)
 565                 return ret;
 566
 567         m2m_dev = m2m_ctx->m2m_dev;
 568         spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
 569         /* We should not be scheduled anymore, since we're dropping a queue. */
 570         if (m2m_ctx->job_flags & TRANS_QUEUED)
 571                 list_del(&m2m_ctx->queue);
 572         m2m_ctx->job_flags = 0;
 573
 574         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 575         /* Drop queue, since streamoff returns device to the same state as after
 576          * calling reqbufs. */
 577         INIT_LIST_HEAD(&q_ctx->rdy_queue);
 578         q_ctx->num_rdy = 0;
 579         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 580
 581         if (m2m_dev->curr_ctx == m2m_ctx) {
 582                 m2m_dev->curr_ctx = NULL;
 583                 wake_up(&m2m_ctx->finished);
 584         }
 585         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
 586
 587         return 0;
 588 }
 589 EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff);
 590
 591 __poll_t v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 592                            struct poll_table_struct *wait)
 593 {
 594         struct video_device *vfd = video_devdata(file);
 595         __poll_t req_events = poll_requested_events(wait);
 596         struct vb2_queue *src_q, *dst_q;
 597         struct vb2_buffer *src_vb = NULL, *dst_vb = NULL;
 598         __poll_t rc = 0;
 599         unsigned long flags;
 600
 601         if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
 602                 struct v4l2_fh *fh = file->private_data;
 603
 604                 if (v4l2_event_pending(fh))
 605                         rc = EPOLLPRI;
 606                 else if (req_events & EPOLLPRI)
 607                         poll_wait(file, &fh->wait, wait);
 608                 if (!(req_events & (EPOLLOUT | EPOLLWRNORM | EPOLLIN | EPOLLRDNORM)))
 609                         return rc;
 610         }
 611
 612         src_q = v4l2_m2m_get_src_vq(m2m_ctx);
 613         dst_q = v4l2_m2m_get_dst_vq(m2m_ctx);
 614
 615         /*
 616          * There has to be at least one buffer queued on each queued_list, which
 617          * means either in driver already or waiting for driver to claim it
 618          * and start processing.
 619          */
 620         if ((!src_q->streaming || list_empty(&src_q->queued_list))
 621                 && (!dst_q->streaming || list_empty(&dst_q->queued_list))) {
 622                 rc |= EPOLLERR;
 623                 goto end;
 624         }
 625
 626         spin_lock_irqsave(&src_q->done_lock, flags);
 627         if (list_empty(&src_q->done_list))
 628                 poll_wait(file, &src_q->done_wq, wait);
 629         spin_unlock_irqrestore(&src_q->done_lock, flags);
 630
 631         spin_lock_irqsave(&dst_q->done_lock, flags);
 632         if (list_empty(&dst_q->done_list)) {
 633                 /*
 634                  * If the last buffer was dequeued from the capture queue,
 635                  * return immediately. DQBUF will return -EPIPE.
 636                  */
 637                 if (dst_q->last_buffer_dequeued) {
 638                         spin_unlock_irqrestore(&dst_q->done_lock, flags);
 639                         return rc | EPOLLIN | EPOLLRDNORM;
 640                 }
 641
 642                 poll_wait(file, &dst_q->done_wq, wait);
 643         }
 644         spin_unlock_irqrestore(&dst_q->done_lock, flags);
 645
 646         spin_lock_irqsave(&src_q->done_lock, flags);
 647         if (!list_empty(&src_q->done_list))
 648                 src_vb = list_first_entry(&src_q->done_list, struct vb2_buffer,
 649                                                 done_entry);
 650         if (src_vb && (src_vb->state == VB2_BUF_STATE_DONE
 651                         || src_vb->state == VB2_BUF_STATE_ERROR))
 652                 rc |= EPOLLOUT | EPOLLWRNORM;
 653         spin_unlock_irqrestore(&src_q->done_lock, flags);
 654
 655         spin_lock_irqsave(&dst_q->done_lock, flags);
 656         if (!list_empty(&dst_q->done_list))
 657                 dst_vb = list_first_entry(&dst_q->done_list, struct vb2_buffer,
 658                                                 done_entry);
 659         if (dst_vb && (dst_vb->state == VB2_BUF_STATE_DONE
 660                         || dst_vb->state == VB2_BUF_STATE_ERROR))
 661                 rc |= EPOLLIN | EPOLLRDNORM;
 662         spin_unlock_irqrestore(&dst_q->done_lock, flags);
 663
 664 end:
 665         return rc;
 666 }
 667 EXPORT_SYMBOL_GPL(v4l2_m2m_poll);
 668
 669 int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 670                          struct vm_area_struct *vma)
 671 {
 672         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 673         struct vb2_queue *vq;
 674
 675         if (offset < DST_QUEUE_OFF_BASE) {
 676                 vq = v4l2_m2m_get_src_vq(m2m_ctx);
 677         } else {
 678                 vq = v4l2_m2m_get_dst_vq(m2m_ctx);
 679                 vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT);
 680         }
 681
 682         return vb2_mmap(vq, vma);
 683 }
 684 EXPORT_SYMBOL(v4l2_m2m_mmap);
 685
 686 #if defined(CONFIG_MEDIA_CONTROLLER)
 687 void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev)
 688 {
 689         media_remove_intf_links(&m2m_dev->intf_devnode->intf);
 690         media_devnode_remove(m2m_dev->intf_devnode);
 691
 692         media_entity_remove_links(m2m_dev->source);
 693         media_entity_remove_links(&m2m_dev->sink);
 694         media_entity_remove_links(&m2m_dev->proc);
 695         media_device_unregister_entity(m2m_dev->source);
 696         media_device_unregister_entity(&m2m_dev->sink);
 697         media_device_unregister_entity(&m2m_dev->proc);
 698         kfree(m2m_dev->source->name);
 699         kfree(m2m_dev->sink.name);
 700         kfree(m2m_dev->proc.name);
 701 }
 702 EXPORT_SYMBOL_GPL(v4l2_m2m_unregister_media_controller);
 703
 704 static int v4l2_m2m_register_entity(struct media_device *mdev,
 705         struct v4l2_m2m_dev *m2m_dev, enum v4l2_m2m_entity_type type,
 706         struct video_device *vdev, int function)
 707 {
 708         struct media_entity *entity;
 709         struct media_pad *pads;
 710         char *name;
 711         unsigned int len;
 712         int num_pads;
 713         int ret;
 714
 715         switch (type) {
 716         case MEM2MEM_ENT_TYPE_SOURCE:
 717                 entity = m2m_dev->source;
 718                 pads = &m2m_dev->source_pad;
 719                 pads[0].flags = MEDIA_PAD_FL_SOURCE;
 720                 num_pads = 1;
 721                 break;
 722         case MEM2MEM_ENT_TYPE_SINK:
 723                 entity = &m2m_dev->sink;
 724                 pads = &m2m_dev->sink_pad;
 725                 pads[0].flags = MEDIA_PAD_FL_SINK;
 726                 num_pads = 1;
 727                 break;
 728         case MEM2MEM_ENT_TYPE_PROC:
 729                 entity = &m2m_dev->proc;
 730                 pads = m2m_dev->proc_pads;
 731                 pads[0].flags = MEDIA_PAD_FL_SINK;
 732                 pads[1].flags = MEDIA_PAD_FL_SOURCE;
 733                 num_pads = 2;
 734                 break;
 735         default:
 736                 return -EINVAL;
 737         }
 738
 739         entity->obj_type = MEDIA_ENTITY_TYPE_BASE;
 740         if (type != MEM2MEM_ENT_TYPE_PROC) {
 741                 entity->info.dev.major = VIDEO_MAJOR;
 742                 entity->info.dev.minor = vdev->minor;
 743         }
 744         len = strlen(vdev->name) + 2 + strlen(m2m_entity_name[type]);
 745         name = kmalloc(len, GFP_KERNEL);
 746         if (!name)
 747                 return -ENOMEM;
 748         snprintf(name, len, "%s-%s", vdev->name, m2m_entity_name[type]);
 749         entity->name = name;
 750         entity->function = function;
 751
 752         ret = media_entity_pads_init(entity, num_pads, pads);
 753         if (ret)
 754                 return ret;
 755         ret = media_device_register_entity(mdev, entity);
 756         if (ret)
 757                 return ret;
 758
 759         return 0;
 760 }
 761
 762 int v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
 763                 struct video_device *vdev, int function)
 764 {
 765         struct media_device *mdev = vdev->v4l2_dev->mdev;
 766         struct media_link *link;
 767         int ret;
 768
 769         if (!mdev)
 770                 return 0;
 771
 772         /* A memory-to-memory device consists in two
 773          * DMA engine and one video processing entities.
 774          * The DMA engine entities are linked to a V4L interface
 775          */
 776
 777         /* Create the three entities with their pads */
 778         m2m_dev->source = &vdev->entity;
 779         ret = v4l2_m2m_register_entity(mdev, m2m_dev,
 780                         MEM2MEM_ENT_TYPE_SOURCE, vdev, MEDIA_ENT_F_IO_V4L);
 781         if (ret)
 782                 return ret;
 783         ret = v4l2_m2m_register_entity(mdev, m2m_dev,
 784                         MEM2MEM_ENT_TYPE_PROC, vdev, function);
 785         if (ret)
 786                 goto err_rel_entity0;
 787         ret = v4l2_m2m_register_entity(mdev, m2m_dev,
 788                         MEM2MEM_ENT_TYPE_SINK, vdev, MEDIA_ENT_F_IO_V4L);
 789         if (ret)
 790                 goto err_rel_entity1;
 791
 792         /* Connect the three entities */
 793         ret = media_create_pad_link(m2m_dev->source, 0, &m2m_dev->proc, 1,
 794                         MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
 795         if (ret)
 796                 goto err_rel_entity2;
 797
 798         ret = media_create_pad_link(&m2m_dev->proc, 0, &m2m_dev->sink, 0,
 799                         MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
 800         if (ret)
 801                 goto err_rm_links0;
 802
 803         /* Create video interface */
 804         m2m_dev->intf_devnode = media_devnode_create(mdev,
 805                         MEDIA_INTF_T_V4L_VIDEO, 0,
 806                         VIDEO_MAJOR, vdev->minor);
 807         if (!m2m_dev->intf_devnode) {
 808                 ret = -ENOMEM;
 809                 goto err_rm_links1;
 810         }
 811
 812         /* Connect the two DMA engines to the interface */
 813         link = media_create_intf_link(m2m_dev->source,
 814                         &m2m_dev->intf_devnode->intf,
 815                         MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
 816         if (!link) {
 817                 ret = -ENOMEM;
 818                 goto err_rm_devnode;
 819         }
 820
 821         link = media_create_intf_link(&m2m_dev->sink,
 822                         &m2m_dev->intf_devnode->intf,
 823                         MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
 824         if (!link) {
 825                 ret = -ENOMEM;
 826                 goto err_rm_intf_link;
 827         }
 828         return 0;
 829
 830 err_rm_intf_link:
 831         media_remove_intf_links(&m2m_dev->intf_devnode->intf);
 832 err_rm_devnode:
 833         media_devnode_remove(m2m_dev->intf_devnode);
 834 err_rm_links1:
 835         media_entity_remove_links(&m2m_dev->sink);
 836 err_rm_links0:
 837         media_entity_remove_links(&m2m_dev->proc);
 838         media_entity_remove_links(m2m_dev->source);
 839 err_rel_entity2:
 840         media_device_unregister_entity(&m2m_dev->proc);
 841         kfree(m2m_dev->proc.name);
 842 err_rel_entity1:
 843         media_device_unregister_entity(&m2m_dev->sink);
 844         kfree(m2m_dev->sink.name);
 845 err_rel_entity0:
 846         media_device_unregister_entity(m2m_dev->source);
 847         kfree(m2m_dev->source->name);
 848         return ret;
 849         return 0;
 850 }
 851 EXPORT_SYMBOL_GPL(v4l2_m2m_register_media_controller);
 852 #endif
 853
 854 struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops)
 855 {
 856         struct v4l2_m2m_dev *m2m_dev;
 857
 858         if (!m2m_ops || WARN_ON(!m2m_ops->device_run))
 859                 return ERR_PTR(-EINVAL);
 860
 861         m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL);
 862         if (!m2m_dev)
 863                 return ERR_PTR(-ENOMEM);
 864
 865         m2m_dev->curr_ctx = NULL;
 866         m2m_dev->m2m_ops = m2m_ops;
 867         INIT_LIST_HEAD(&m2m_dev->job_queue);
 868         spin_lock_init(&m2m_dev->job_spinlock);
 869
 870         return m2m_dev;
 871 }
 872 EXPORT_SYMBOL_GPL(v4l2_m2m_init);
 873
 874 void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev)
 875 {
 876         kfree(m2m_dev);
 877 }
 878 EXPORT_SYMBOL_GPL(v4l2_m2m_release);
 879
 880 struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
 881                 void *drv_priv,
 882                 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq))
 883 {
 884         struct v4l2_m2m_ctx *m2m_ctx;
 885         struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx;
 886         int ret;
 887
 888         m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL);
 889         if (!m2m_ctx)
 890                 return ERR_PTR(-ENOMEM);
 891
 892         m2m_ctx->priv = drv_priv;
 893         m2m_ctx->m2m_dev = m2m_dev;
 894         init_waitqueue_head(&m2m_ctx->finished);
 895
 896         out_q_ctx = &m2m_ctx->out_q_ctx;
 897         cap_q_ctx = &m2m_ctx->cap_q_ctx;
 898
 899         INIT_LIST_HEAD(&out_q_ctx->rdy_queue);
 900         INIT_LIST_HEAD(&cap_q_ctx->rdy_queue);
 901         spin_lock_init(&out_q_ctx->rdy_spinlock);
 902         spin_lock_init(&cap_q_ctx->rdy_spinlock);
 903
 904         INIT_LIST_HEAD(&m2m_ctx->queue);
 905
 906         ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q);
 907
 908         if (ret)
 909                 goto err;
 910         /*
 911          * If both queues use same mutex assign it as the common buffer
 912          * queues lock to the m2m context. This lock is used in the
 913          * v4l2_m2m_ioctl_* helpers.
 914          */
 915         if (out_q_ctx->q.lock == cap_q_ctx->q.lock)
 916                 m2m_ctx->q_lock = out_q_ctx->q.lock;
 917
 918         return m2m_ctx;
 919 err:
 920         kfree(m2m_ctx);
 921         return ERR_PTR(ret);
 922 }
 923 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init);
 924
 925 void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx)
 926 {
 927         /* wait until the current context is dequeued from job_queue */
 928         v4l2_m2m_cancel_job(m2m_ctx);
 929
 930         vb2_queue_release(&m2m_ctx->cap_q_ctx.q);
 931         vb2_queue_release(&m2m_ctx->out_q_ctx.q);
 932
 933         kfree(m2m_ctx);
 934 }
 935 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release);
 936
 937 void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
 938                 struct vb2_v4l2_buffer *vbuf)
 939 {
 940         struct v4l2_m2m_buffer *b = container_of(vbuf,
 941                                 struct v4l2_m2m_buffer, vb);
 942         struct v4l2_m2m_queue_ctx *q_ctx;
 943         unsigned long flags;
 944
 945         q_ctx = get_queue_ctx(m2m_ctx, vbuf->vb2_buf.vb2_queue->type);
 946         if (!q_ctx)
 947                 return;
 948
 949         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 950         list_add_tail(&b->list, &q_ctx->rdy_queue);
 951         q_ctx->num_rdy++;
 952         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 953 }
 954 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue);
 955
 956 void v4l2_m2m_request_queue(struct media_request *req)
 957 {
 958         struct media_request_object *obj, *obj_safe;
 959         struct v4l2_m2m_ctx *m2m_ctx = NULL;
 960
 961         /*
 962          * Queue all objects. Note that buffer objects are at the end of the
 963          * objects list, after all other object types. Once buffer objects
 964          * are queued, the driver might delete them immediately (if the driver
 965          * processes the buffer at once), so we have to use
 966          * list_for_each_entry_safe() to handle the case where the object we
 967          * queue is deleted.
 968          */
 969         list_for_each_entry_safe(obj, obj_safe, &req->objects, list) {
 970                 struct v4l2_m2m_ctx *m2m_ctx_obj;
 971                 struct vb2_buffer *vb;
 972
 973                 if (!obj->ops->queue)
 974                         continue;
 975
 976                 if (vb2_request_object_is_buffer(obj)) {
 977                         /* Sanity checks */
 978                         vb = container_of(obj, struct vb2_buffer, req_obj);
 979                         WARN_ON(!V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type));
 980                         m2m_ctx_obj = container_of(vb->vb2_queue,
 981                                                    struct v4l2_m2m_ctx,
 982                                                    out_q_ctx.q);
 983                         WARN_ON(m2m_ctx && m2m_ctx_obj != m2m_ctx);
 984                         m2m_ctx = m2m_ctx_obj;
 985                 }
 986
 987                 /*
 988                  * The buffer we queue here can in theory be immediately
 989                  * unbound, hence the use of list_for_each_entry_safe()
 990                  * above and why we call the queue op last.
 991                  */
 992                 obj->ops->queue(obj);
 993         }
 994
 995         WARN_ON(!m2m_ctx);
 996
 997         if (m2m_ctx)
 998                 v4l2_m2m_try_schedule(m2m_ctx);
 999 }
1000 EXPORT_SYMBOL_GPL(v4l2_m2m_request_queue);
1001
1002 /* Videobuf2 ioctl helpers */
1003
1004 int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
1005                                 struct v4l2_requestbuffers *rb)
1006 {
1007         struct v4l2_fh *fh = file->private_data;
1008
1009         return v4l2_m2m_reqbufs(file, fh->m2m_ctx, rb);
1010 }
1011 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_reqbufs);
1012
1013 int v4l2_m2m_ioctl_create_bufs(struct file *file, void *priv,
1014                                 struct v4l2_create_buffers *create)
1015 {
1016         struct v4l2_fh *fh = file->private_data;
1017
1018         return v4l2_m2m_create_bufs(file, fh->m2m_ctx, create);
1019 }
1020 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_create_bufs);
1021
1022 int v4l2_m2m_ioctl_querybuf(struct file *file, void *priv,
1023                                 struct v4l2_buffer *buf)
1024 {
1025         struct v4l2_fh *fh = file->private_data;
1026
1027         return v4l2_m2m_querybuf(file, fh->m2m_ctx, buf);
1028 }
1029 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_querybuf);
1030
1031 int v4l2_m2m_ioctl_qbuf(struct file *file, void *priv,
1032                                 struct v4l2_buffer *buf)
1033 {
1034         struct v4l2_fh *fh = file->private_data;
1035
1036         return v4l2_m2m_qbuf(file, fh->m2m_ctx, buf);
1037 }
1038 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_qbuf);
1039
1040 int v4l2_m2m_ioctl_dqbuf(struct file *file, void *priv,
1041                                 struct v4l2_buffer *buf)
1042 {
1043         struct v4l2_fh *fh = file->private_data;
1044
1045         return v4l2_m2m_dqbuf(file, fh->m2m_ctx, buf);
1046 }
1047 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_dqbuf);
1048
1049 int v4l2_m2m_ioctl_prepare_buf(struct file *file, void *priv,
1050                                struct v4l2_buffer *buf)
1051 {
1052         struct v4l2_fh *fh = file->private_data;
1053
1054         return v4l2_m2m_prepare_buf(file, fh->m2m_ctx, buf);
1055 }
1056 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_prepare_buf);
1057
1058 int v4l2_m2m_ioctl_expbuf(struct file *file, void *priv,
1059                                 struct v4l2_exportbuffer *eb)
1060 {
1061         struct v4l2_fh *fh = file->private_data;
1062
1063         return v4l2_m2m_expbuf(file, fh->m2m_ctx, eb);
1064 }
1065 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_expbuf);
1066
1067 int v4l2_m2m_ioctl_streamon(struct file *file, void *priv,
1068                                 enum v4l2_buf_type type)
1069 {
1070         struct v4l2_fh *fh = file->private_data;
1071
1072         return v4l2_m2m_streamon(file, fh->m2m_ctx, type);
1073 }
1074 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamon);
1075
1076 int v4l2_m2m_ioctl_streamoff(struct file *file, void *priv,
1077                                 enum v4l2_buf_type type)
1078 {
1079         struct v4l2_fh *fh = file->private_data;
1080
1081         return v4l2_m2m_streamoff(file, fh->m2m_ctx, type);
1082 }
1083 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamoff);
1084
1085 /*
1086  * v4l2_file_operations helpers. It is assumed here same lock is used
1087  * for the output and the capture buffer queue.
1088  */
1089
1090 int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma)
1091 {
1092         struct v4l2_fh *fh = file->private_data;
1093
1094         return v4l2_m2m_mmap(file, fh->m2m_ctx, vma);
1095 }
1096 EXPORT_SYMBOL_GPL(v4l2_m2m_fop_mmap);
1097
1098 __poll_t v4l2_m2m_fop_poll(struct file *file, poll_table *wait)
1099 {
1100         struct v4l2_fh *fh = file->private_data;
1101         struct v4l2_m2m_ctx *m2m_ctx = fh->m2m_ctx;
1102         __poll_t ret;
1103
1104         if (m2m_ctx->q_lock)
1105                 mutex_lock(m2m_ctx->q_lock);
1106
1107         ret = v4l2_m2m_poll(file, m2m_ctx, wait);
1108
1109         if (m2m_ctx->q_lock)
1110                 mutex_unlock(m2m_ctx->q_lock);
1111
1112         return ret;
1113 }
1114 EXPORT_SYMBOL_GPL(v4l2_m2m_fop_poll);
1115