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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Memory-to-memory device framework for Video for Linux 2 and videobuf.
   4  *
   5  * Helper functions for devices that use videobuf buffers for both their
   6  * source and destination.
   7  *
   8  * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd.
   9  * Pawel Osciak, <pawel@osciak.com>
  10  * Marek Szyprowski, <m.szyprowski@samsung.com>
  11  */
  12 #include <linux/module.h>
  13 #include <linux/sched.h>
  14 #include <linux/slab.h>
  15
  16 #include <media/media-device.h>
  17 #include <media/videobuf2-v4l2.h>
  18 #include <media/v4l2-mem2mem.h>
  19 #include <media/v4l2-dev.h>
  20 #include <media/v4l2-device.h>
  21 #include <media/v4l2-fh.h>
  22 #include <media/v4l2-event.h>
  23
  24 MODULE_DESCRIPTION("Mem to mem device framework for videobuf");
  25 MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>");
  26 MODULE_LICENSE("GPL");
  27
  28 static bool debug;
  29 module_param(debug, bool, 0644);
  30
  31 #define dprintk(fmt, arg...)                                            \
  32         do {                                                            \
  33                 if (debug)                                              \
  34                         printk(KERN_DEBUG "%s: " fmt, __func__, ## arg);\
  35         } while (0)
  36
  37
  38 /* Instance is already queued on the job_queue */
  39 #define TRANS_QUEUED            (1 << 0)
  40 /* Instance is currently running in hardware */
  41 #define TRANS_RUNNING           (1 << 1)
  42 /* Instance is currently aborting */
  43 #define TRANS_ABORT             (1 << 2)
  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 enum v4l2_m2m_entity_type {
  52         MEM2MEM_ENT_TYPE_SOURCE,
  53         MEM2MEM_ENT_TYPE_SINK,
  54         MEM2MEM_ENT_TYPE_PROC
  55 };
  56
  57 static const char * const m2m_entity_name[] = {
  58         "source",
  59         "sink",
  60         "proc"
  61 };
  62
  63 /**
  64  * struct v4l2_m2m_dev - per-device context
  65  * @source:             &struct media_entity pointer with the source entity
  66  *                      Used only when the M2M device is registered via
  67  *                      v4l2_m2m_unregister_media_controller().
  68  * @source_pad:         &struct media_pad with the source pad.
  69  *                      Used only when the M2M device is registered via
  70  *                      v4l2_m2m_unregister_media_controller().
  71  * @sink:               &struct media_entity pointer with the sink entity
  72  *                      Used only when the M2M device is registered via
  73  *                      v4l2_m2m_unregister_media_controller().
  74  * @sink_pad:           &struct media_pad with the sink pad.
  75  *                      Used only when the M2M device is registered via
  76  *                      v4l2_m2m_unregister_media_controller().
  77  * @proc:               &struct media_entity pointer with the M2M device itself.
  78  * @proc_pads:          &struct media_pad with the @proc pads.
  79  *                      Used only when the M2M device is registered via
  80  *                      v4l2_m2m_unregister_media_controller().
  81  * @intf_devnode:       &struct media_intf devnode pointer with the interface
  82  *                      with controls the M2M device.
  83  * @curr_ctx:           currently running instance
  84  * @job_queue:          instances queued to run
  85  * @job_spinlock:       protects job_queue
  86  * @job_work:           worker to run queued jobs.
  87  * @m2m_ops:            driver callbacks
  88  */
  89 struct v4l2_m2m_dev {
  90         struct v4l2_m2m_ctx     *curr_ctx;
  91 #ifdef CONFIG_MEDIA_CONTROLLER
  92         struct media_entity     *source;
  93         struct media_pad        source_pad;
  94         struct media_entity     sink;
  95         struct media_pad        sink_pad;
  96         struct media_entity     proc;
  97         struct media_pad        proc_pads[2];
  98         struct media_intf_devnode *intf_devnode;
  99 #endif
 100
 101         struct list_head        job_queue;
 102         spinlock_t              job_spinlock;
 103         struct work_struct      job_work;
 104
 105         const struct v4l2_m2m_ops *m2m_ops;
 106 };
 107
 108 static struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx,
 109                                                 enum v4l2_buf_type type)
 110 {
 111         if (V4L2_TYPE_IS_OUTPUT(type))
 112                 return &m2m_ctx->out_q_ctx;
 113         else
 114                 return &m2m_ctx->cap_q_ctx;
 115 }
 116
 117 struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
 118                                        enum v4l2_buf_type type)
 119 {
 120         struct v4l2_m2m_queue_ctx *q_ctx;
 121
 122         q_ctx = get_queue_ctx(m2m_ctx, type);
 123         if (!q_ctx)
 124                 return NULL;
 125
 126         return &q_ctx->q;
 127 }
 128 EXPORT_SYMBOL(v4l2_m2m_get_vq);
 129
 130 struct vb2_v4l2_buffer *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx)
 131 {
 132         struct v4l2_m2m_buffer *b;
 133         unsigned long flags;
 134
 135         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 136
 137         if (list_empty(&q_ctx->rdy_queue)) {
 138                 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 139                 return NULL;
 140         }
 141
 142         b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
 143         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 144         return &b->vb;
 145 }
 146 EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf);
 147
 148 struct vb2_v4l2_buffer *v4l2_m2m_last_buf(struct v4l2_m2m_queue_ctx *q_ctx)
 149 {
 150         struct v4l2_m2m_buffer *b;
 151         unsigned long flags;
 152
 153         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 154
 155         if (list_empty(&q_ctx->rdy_queue)) {
 156                 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 157                 return NULL;
 158         }
 159
 160         b = list_last_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
 161         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 162         return &b->vb;
 163 }
 164 EXPORT_SYMBOL_GPL(v4l2_m2m_last_buf);
 165
 166 struct vb2_v4l2_buffer *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx)
 167 {
 168         struct v4l2_m2m_buffer *b;
 169         unsigned long flags;
 170
 171         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 172         if (list_empty(&q_ctx->rdy_queue)) {
 173                 spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 174                 return NULL;
 175         }
 176         b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
 177         list_del(&b->list);
 178         q_ctx->num_rdy--;
 179         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 180
 181         return &b->vb;
 182 }
 183 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove);
 184
 185 void v4l2_m2m_buf_remove_by_buf(struct v4l2_m2m_queue_ctx *q_ctx,
 186                                 struct vb2_v4l2_buffer *vbuf)
 187 {
 188         struct v4l2_m2m_buffer *b;
 189         unsigned long flags;
 190
 191         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 192         b = container_of(vbuf, struct v4l2_m2m_buffer, vb);
 193         list_del(&b->list);
 194         q_ctx->num_rdy--;
 195         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 196 }
 197 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove_by_buf);
 198
 199 struct vb2_v4l2_buffer *
 200 v4l2_m2m_buf_remove_by_idx(struct v4l2_m2m_queue_ctx *q_ctx, unsigned int idx)
 201
 202 {
 203         struct v4l2_m2m_buffer *b, *tmp;
 204         struct vb2_v4l2_buffer *ret = NULL;
 205         unsigned long flags;
 206
 207         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 208         list_for_each_entry_safe(b, tmp, &q_ctx->rdy_queue, list) {
 209                 if (b->vb.vb2_buf.index == idx) {
 210                         list_del(&b->list);
 211                         q_ctx->num_rdy--;
 212                         ret = &b->vb;
 213                         break;
 214                 }
 215         }
 216         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 217
 218         return ret;
 219 }
 220 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove_by_idx);
 221
 222 /*
 223  * Scheduling handlers
 224  */
 225
 226 void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev)
 227 {
 228         unsigned long flags;
 229         void *ret = NULL;
 230
 231         spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
 232         if (m2m_dev->curr_ctx)
 233                 ret = m2m_dev->curr_ctx->priv;
 234         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 235
 236         return ret;
 237 }
 238 EXPORT_SYMBOL(v4l2_m2m_get_curr_priv);
 239
 240 /**
 241  * v4l2_m2m_try_run() - select next job to perform and run it if possible
 242  * @m2m_dev: per-device context
 243  *
 244  * Get next transaction (if present) from the waiting jobs list and run it.
 245  *
 246  * Note that this function can run on a given v4l2_m2m_ctx context,
 247  * but call .device_run for another context.
 248  */
 249 static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev)
 250 {
 251         unsigned long flags;
 252
 253         spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
 254         if (NULL != m2m_dev->curr_ctx) {
 255                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 256                 dprintk("Another instance is running, won't run now\n");
 257                 return;
 258         }
 259
 260         if (list_empty(&m2m_dev->job_queue)) {
 261                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 262                 dprintk("No job pending\n");
 263                 return;
 264         }
 265
 266         m2m_dev->curr_ctx = list_first_entry(&m2m_dev->job_queue,
 267                                    struct v4l2_m2m_ctx, queue);
 268         m2m_dev->curr_ctx->job_flags |= TRANS_RUNNING;
 269         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 270
 271         dprintk("Running job on m2m_ctx: %p\n", m2m_dev->curr_ctx);
 272         m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv);
 273 }
 274
 275 /*
 276  * __v4l2_m2m_try_queue() - queue a job
 277  * @m2m_dev: m2m device
 278  * @m2m_ctx: m2m context
 279  *
 280  * Check if this context is ready to queue a job.
 281  *
 282  * This function can run in interrupt context.
 283  */
 284 static void __v4l2_m2m_try_queue(struct v4l2_m2m_dev *m2m_dev,
 285                                  struct v4l2_m2m_ctx *m2m_ctx)
 286 {
 287         unsigned long flags_job, flags_out, flags_cap;
 288
 289         dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx);
 290
 291         if (!m2m_ctx->out_q_ctx.q.streaming
 292             || !m2m_ctx->cap_q_ctx.q.streaming) {
 293                 dprintk("Streaming needs to be on for both queues\n");
 294                 return;
 295         }
 296
 297         spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
 298
 299         /* If the context is aborted then don't schedule it */
 300         if (m2m_ctx->job_flags & TRANS_ABORT) {
 301                 dprintk("Aborted context\n");
 302                 goto job_unlock;
 303         }
 304
 305         if (m2m_ctx->job_flags & TRANS_QUEUED) {
 306                 dprintk("On job queue already\n");
 307                 goto job_unlock;
 308         }
 309
 310         spin_lock_irqsave(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out);
 311         if (list_empty(&m2m_ctx->out_q_ctx.rdy_queue)
 312             && !m2m_ctx->out_q_ctx.buffered) {
 313                 dprintk("No input buffers available\n");
 314                 goto out_unlock;
 315         }
 316         spin_lock_irqsave(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap);
 317         if (list_empty(&m2m_ctx->cap_q_ctx.rdy_queue)
 318             && !m2m_ctx->cap_q_ctx.buffered) {
 319                 dprintk("No output buffers available\n");
 320                 goto cap_unlock;
 321         }
 322         spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap);
 323         spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out);
 324
 325         if (m2m_dev->m2m_ops->job_ready
 326                 && (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) {
 327                 dprintk("Driver not ready\n");
 328                 goto job_unlock;
 329         }
 330
 331         list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue);
 332         m2m_ctx->job_flags |= TRANS_QUEUED;
 333
 334         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
 335         return;
 336
 337 cap_unlock:
 338         spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap);
 339 out_unlock:
 340         spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out);
 341 job_unlock:
 342         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
 343 }
 344
 345 /**
 346  * v4l2_m2m_try_schedule() - schedule and possibly run a job for any context
 347  * @m2m_ctx: m2m context
 348  *
 349  * Check if this context is ready to queue a job. If suitable,
 350  * run the next queued job on the mem2mem device.
 351  *
 352  * This function shouldn't run in interrupt context.
 353  *
 354  * Note that v4l2_m2m_try_schedule() can schedule one job for this context,
 355  * and then run another job for another context.
 356  */
 357 void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx)
 358 {
 359         struct v4l2_m2m_dev *m2m_dev = m2m_ctx->m2m_dev;
 360
 361         __v4l2_m2m_try_queue(m2m_dev, m2m_ctx);
 362         v4l2_m2m_try_run(m2m_dev);
 363 }
 364 EXPORT_SYMBOL_GPL(v4l2_m2m_try_schedule);
 365
 366 /**
 367  * v4l2_m2m_device_run_work() - run pending jobs for the context
 368  * @work: Work structure used for scheduling the execution of this function.
 369  */
 370 static void v4l2_m2m_device_run_work(struct work_struct *work)
 371 {
 372         struct v4l2_m2m_dev *m2m_dev =
 373                 container_of(work, struct v4l2_m2m_dev, job_work);
 374
 375         v4l2_m2m_try_run(m2m_dev);
 376 }
 377
 378 /**
 379  * v4l2_m2m_cancel_job() - cancel pending jobs for the context
 380  * @m2m_ctx: m2m context with jobs to be canceled
 381  *
 382  * In case of streamoff or release called on any context,
 383  * 1] If the context is currently running, then abort job will be called
 384  * 2] If the context is queued, then the context will be removed from
 385  *    the job_queue
 386  */
 387 static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx *m2m_ctx)
 388 {
 389         struct v4l2_m2m_dev *m2m_dev;
 390         unsigned long flags;
 391
 392         m2m_dev = m2m_ctx->m2m_dev;
 393         spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
 394
 395         m2m_ctx->job_flags |= TRANS_ABORT;
 396         if (m2m_ctx->job_flags & TRANS_RUNNING) {
 397                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 398                 if (m2m_dev->m2m_ops->job_abort)
 399                         m2m_dev->m2m_ops->job_abort(m2m_ctx->priv);
 400                 dprintk("m2m_ctx %p running, will wait to complete\n", m2m_ctx);
 401                 wait_event(m2m_ctx->finished,
 402                                 !(m2m_ctx->job_flags & TRANS_RUNNING));
 403         } else if (m2m_ctx->job_flags & TRANS_QUEUED) {
 404                 list_del(&m2m_ctx->queue);
 405                 m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
 406                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 407                 dprintk("m2m_ctx: %p had been on queue and was removed\n",
 408                         m2m_ctx);
 409         } else {
 410                 /* Do nothing, was not on queue/running */
 411                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 412         }
 413 }
 414
 415 void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
 416                          struct v4l2_m2m_ctx *m2m_ctx)
 417 {
 418         unsigned long flags;
 419
 420         spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
 421         if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) {
 422                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 423                 dprintk("Called by an instance not currently running\n");
 424                 return;
 425         }
 426
 427         list_del(&m2m_dev->curr_ctx->queue);
 428         m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
 429         wake_up(&m2m_dev->curr_ctx->finished);
 430         m2m_dev->curr_ctx = NULL;
 431
 432         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 433
 434         /* This instance might have more buffers ready, but since we do not
 435          * allow more than one job on the job_queue per instance, each has
 436          * to be scheduled separately after the previous one finishes. */
 437         __v4l2_m2m_try_queue(m2m_dev, m2m_ctx);
 438
 439         /* We might be running in atomic context,
 440          * but the job must be run in non-atomic context.
 441          */
 442         schedule_work(&m2m_dev->job_work);
 443 }
 444 EXPORT_SYMBOL(v4l2_m2m_job_finish);
 445
 446 int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 447                      struct v4l2_requestbuffers *reqbufs)
 448 {
 449         struct vb2_queue *vq;
 450         int ret;
 451
 452         vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type);
 453         ret = vb2_reqbufs(vq, reqbufs);
 454         /* If count == 0, then the owner has released all buffers and he
 455            is no longer owner of the queue. Otherwise we have an owner. */
 456         if (ret == 0)
 457                 vq->owner = reqbufs->count ? file->private_data : NULL;
 458
 459         return ret;
 460 }
 461 EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs);
 462
 463 int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 464                       struct v4l2_buffer *buf)
 465 {
 466         struct vb2_queue *vq;
 467         int ret = 0;
 468         unsigned int i;
 469
 470         vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
 471         ret = vb2_querybuf(vq, buf);
 472
 473         /* Adjust MMAP memory offsets for the CAPTURE queue */
 474         if (buf->memory == V4L2_MEMORY_MMAP && !V4L2_TYPE_IS_OUTPUT(vq->type)) {
 475                 if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) {
 476                         for (i = 0; i < buf->length; ++i)
 477                                 buf->m.planes[i].m.mem_offset
 478                                         += DST_QUEUE_OFF_BASE;
 479                 } else {
 480                         buf->m.offset += DST_QUEUE_OFF_BASE;
 481                 }
 482         }
 483
 484         return ret;
 485 }
 486 EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf);
 487
 488 int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 489                   struct v4l2_buffer *buf)
 490 {
 491         struct video_device *vdev = video_devdata(file);
 492         struct vb2_queue *vq;
 493         int ret;
 494
 495         vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
 496         if (!V4L2_TYPE_IS_OUTPUT(vq->type) &&
 497             (buf->flags & V4L2_BUF_FLAG_REQUEST_FD)) {
 498                 dprintk("%s: requests cannot be used with capture buffers\n",
 499                         __func__);
 500                 return -EPERM;
 501         }
 502         ret = vb2_qbuf(vq, vdev->v4l2_dev->mdev, buf);
 503         if (!ret && !(buf->flags & V4L2_BUF_FLAG_IN_REQUEST))
 504                 v4l2_m2m_try_schedule(m2m_ctx);
 505
 506         return ret;
 507 }
 508 EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf);
 509
 510 int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 511                    struct v4l2_buffer *buf)
 512 {
 513         struct vb2_queue *vq;
 514
 515         vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
 516         return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK);
 517 }
 518 EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf);
 519
 520 int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 521                          struct v4l2_buffer *buf)
 522 {
 523         struct video_device *vdev = video_devdata(file);
 524         struct vb2_queue *vq;
 525
 526         vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
 527         return vb2_prepare_buf(vq, vdev->v4l2_dev->mdev, buf);
 528 }
 529 EXPORT_SYMBOL_GPL(v4l2_m2m_prepare_buf);
 530
 531 int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 532                          struct v4l2_create_buffers *create)
 533 {
 534         struct vb2_queue *vq;
 535
 536         vq = v4l2_m2m_get_vq(m2m_ctx, create->format.type);
 537         return vb2_create_bufs(vq, create);
 538 }
 539 EXPORT_SYMBOL_GPL(v4l2_m2m_create_bufs);
 540
 541 int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 542                   struct v4l2_exportbuffer *eb)
 543 {
 544         struct vb2_queue *vq;
 545
 546         vq = v4l2_m2m_get_vq(m2m_ctx, eb->type);
 547         return vb2_expbuf(vq, eb);
 548 }
 549 EXPORT_SYMBOL_GPL(v4l2_m2m_expbuf);
 550
 551 int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 552                       enum v4l2_buf_type type)
 553 {
 554         struct vb2_queue *vq;
 555         int ret;
 556
 557         vq = v4l2_m2m_get_vq(m2m_ctx, type);
 558         ret = vb2_streamon(vq, type);
 559         if (!ret)
 560                 v4l2_m2m_try_schedule(m2m_ctx);
 561
 562         return ret;
 563 }
 564 EXPORT_SYMBOL_GPL(v4l2_m2m_streamon);
 565
 566 int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 567                        enum v4l2_buf_type type)
 568 {
 569         struct v4l2_m2m_dev *m2m_dev;
 570         struct v4l2_m2m_queue_ctx *q_ctx;
 571         unsigned long flags_job, flags;
 572         int ret;
 573
 574         /* wait until the current context is dequeued from job_queue */
 575         v4l2_m2m_cancel_job(m2m_ctx);
 576
 577         q_ctx = get_queue_ctx(m2m_ctx, type);
 578         ret = vb2_streamoff(&q_ctx->q, type);
 579         if (ret)
 580                 return ret;
 581
 582         m2m_dev = m2m_ctx->m2m_dev;
 583         spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
 584         /* We should not be scheduled anymore, since we're dropping a queue. */
 585         if (m2m_ctx->job_flags & TRANS_QUEUED)
 586                 list_del(&m2m_ctx->queue);
 587         m2m_ctx->job_flags = 0;
 588
 589         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 590         /* Drop queue, since streamoff returns device to the same state as after
 591          * calling reqbufs. */
 592         INIT_LIST_HEAD(&q_ctx->rdy_queue);
 593         q_ctx->num_rdy = 0;
 594         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 595
 596         if (m2m_dev->curr_ctx == m2m_ctx) {
 597                 m2m_dev->curr_ctx = NULL;
 598                 wake_up(&m2m_ctx->finished);
 599         }
 600         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
 601
 602         return 0;
 603 }
 604 EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff);
 605
 606 __poll_t v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 607                            struct poll_table_struct *wait)
 608 {
 609         struct video_device *vfd = video_devdata(file);
 610         __poll_t req_events = poll_requested_events(wait);
 611         struct vb2_queue *src_q, *dst_q;
 612         struct vb2_buffer *src_vb = NULL, *dst_vb = NULL;
 613         __poll_t rc = 0;
 614         unsigned long flags;
 615
 616         src_q = v4l2_m2m_get_src_vq(m2m_ctx);
 617         dst_q = v4l2_m2m_get_dst_vq(m2m_ctx);
 618
 619         poll_wait(file, &src_q->done_wq, wait);
 620         poll_wait(file, &dst_q->done_wq, wait);
 621
 622         if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
 623                 struct v4l2_fh *fh = file->private_data;
 624
 625                 poll_wait(file, &fh->wait, wait);
 626                 if (v4l2_event_pending(fh))
 627                         rc = EPOLLPRI;
 628                 if (!(req_events & (EPOLLOUT | EPOLLWRNORM | EPOLLIN | EPOLLRDNORM)))
 629                         return rc;
 630         }
 631
 632         /*
 633          * There has to be at least one buffer queued on each queued_list, which
 634          * means either in driver already or waiting for driver to claim it
 635          * and start processing.
 636          */
 637         if ((!src_q->streaming || src_q->error ||
 638              list_empty(&src_q->queued_list)) &&
 639             (!dst_q->streaming || dst_q->error ||
 640              list_empty(&dst_q->queued_list))) {
 641                 rc |= EPOLLERR;
 642                 goto end;
 643         }
 644
 645         spin_lock_irqsave(&dst_q->done_lock, flags);
 646         if (list_empty(&dst_q->done_list)) {
 647                 /*
 648                  * If the last buffer was dequeued from the capture queue,
 649                  * return immediately. DQBUF will return -EPIPE.
 650                  */
 651                 if (dst_q->last_buffer_dequeued) {
 652                         spin_unlock_irqrestore(&dst_q->done_lock, flags);
 653                         return rc | EPOLLIN | EPOLLRDNORM;
 654                 }
 655         }
 656         spin_unlock_irqrestore(&dst_q->done_lock, flags);
 657
 658         spin_lock_irqsave(&src_q->done_lock, flags);
 659         if (!list_empty(&src_q->done_list))
 660                 src_vb = list_first_entry(&src_q->done_list, struct vb2_buffer,
 661                                                 done_entry);
 662         if (src_vb && (src_vb->state == VB2_BUF_STATE_DONE
 663                         || src_vb->state == VB2_BUF_STATE_ERROR))
 664                 rc |= EPOLLOUT | EPOLLWRNORM;
 665         spin_unlock_irqrestore(&src_q->done_lock, flags);
 666
 667         spin_lock_irqsave(&dst_q->done_lock, flags);
 668         if (!list_empty(&dst_q->done_list))
 669                 dst_vb = list_first_entry(&dst_q->done_list, struct vb2_buffer,
 670                                                 done_entry);
 671         if (dst_vb && (dst_vb->state == VB2_BUF_STATE_DONE
 672                         || dst_vb->state == VB2_BUF_STATE_ERROR))
 673                 rc |= EPOLLIN | EPOLLRDNORM;
 674         spin_unlock_irqrestore(&dst_q->done_lock, flags);
 675
 676 end:
 677         return rc;
 678 }
 679 EXPORT_SYMBOL_GPL(v4l2_m2m_poll);
 680
 681 int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 682                          struct vm_area_struct *vma)
 683 {
 684         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 685         struct vb2_queue *vq;
 686
 687         if (offset < DST_QUEUE_OFF_BASE) {
 688                 vq = v4l2_m2m_get_src_vq(m2m_ctx);
 689         } else {
 690                 vq = v4l2_m2m_get_dst_vq(m2m_ctx);
 691                 vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT);
 692         }
 693
 694         return vb2_mmap(vq, vma);
 695 }
 696 EXPORT_SYMBOL(v4l2_m2m_mmap);
 697
 698 #if defined(CONFIG_MEDIA_CONTROLLER)
 699 void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev)
 700 {
 701         media_remove_intf_links(&m2m_dev->intf_devnode->intf);
 702         media_devnode_remove(m2m_dev->intf_devnode);
 703
 704         media_entity_remove_links(m2m_dev->source);
 705         media_entity_remove_links(&m2m_dev->sink);
 706         media_entity_remove_links(&m2m_dev->proc);
 707         media_device_unregister_entity(m2m_dev->source);
 708         media_device_unregister_entity(&m2m_dev->sink);
 709         media_device_unregister_entity(&m2m_dev->proc);
 710         kfree(m2m_dev->source->name);
 711         kfree(m2m_dev->sink.name);
 712         kfree(m2m_dev->proc.name);
 713 }
 714 EXPORT_SYMBOL_GPL(v4l2_m2m_unregister_media_controller);
 715
 716 static int v4l2_m2m_register_entity(struct media_device *mdev,
 717         struct v4l2_m2m_dev *m2m_dev, enum v4l2_m2m_entity_type type,
 718         struct video_device *vdev, int function)
 719 {
 720         struct media_entity *entity;
 721         struct media_pad *pads;
 722         char *name;
 723         unsigned int len;
 724         int num_pads;
 725         int ret;
 726
 727         switch (type) {
 728         case MEM2MEM_ENT_TYPE_SOURCE:
 729                 entity = m2m_dev->source;
 730                 pads = &m2m_dev->source_pad;
 731                 pads[0].flags = MEDIA_PAD_FL_SOURCE;
 732                 num_pads = 1;
 733                 break;
 734         case MEM2MEM_ENT_TYPE_SINK:
 735                 entity = &m2m_dev->sink;
 736                 pads = &m2m_dev->sink_pad;
 737                 pads[0].flags = MEDIA_PAD_FL_SINK;
 738                 num_pads = 1;
 739                 break;
 740         case MEM2MEM_ENT_TYPE_PROC:
 741                 entity = &m2m_dev->proc;
 742                 pads = m2m_dev->proc_pads;
 743                 pads[0].flags = MEDIA_PAD_FL_SINK;
 744                 pads[1].flags = MEDIA_PAD_FL_SOURCE;
 745                 num_pads = 2;
 746                 break;
 747         default:
 748                 return -EINVAL;
 749         }
 750
 751         entity->obj_type = MEDIA_ENTITY_TYPE_BASE;
 752         if (type != MEM2MEM_ENT_TYPE_PROC) {
 753                 entity->info.dev.major = VIDEO_MAJOR;
 754                 entity->info.dev.minor = vdev->minor;
 755         }
 756         len = strlen(vdev->name) + 2 + strlen(m2m_entity_name[type]);
 757         name = kmalloc(len, GFP_KERNEL);
 758         if (!name)
 759                 return -ENOMEM;
 760         snprintf(name, len, "%s-%s", vdev->name, m2m_entity_name[type]);
 761         entity->name = name;
 762         entity->function = function;
 763
 764         ret = media_entity_pads_init(entity, num_pads, pads);
 765         if (ret)
 766                 return ret;
 767         ret = media_device_register_entity(mdev, entity);
 768         if (ret)
 769                 return ret;
 770
 771         return 0;
 772 }
 773
 774 int v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
 775                 struct video_device *vdev, int function)
 776 {
 777         struct media_device *mdev = vdev->v4l2_dev->mdev;
 778         struct media_link *link;
 779         int ret;
 780
 781         if (!mdev)
 782                 return 0;
 783
 784         /* A memory-to-memory device consists in two
 785          * DMA engine and one video processing entities.
 786          * The DMA engine entities are linked to a V4L interface
 787          */
 788
 789         /* Create the three entities with their pads */
 790         m2m_dev->source = &vdev->entity;
 791         ret = v4l2_m2m_register_entity(mdev, m2m_dev,
 792                         MEM2MEM_ENT_TYPE_SOURCE, vdev, MEDIA_ENT_F_IO_V4L);
 793         if (ret)
 794                 return ret;
 795         ret = v4l2_m2m_register_entity(mdev, m2m_dev,
 796                         MEM2MEM_ENT_TYPE_PROC, vdev, function);
 797         if (ret)
 798                 goto err_rel_entity0;
 799         ret = v4l2_m2m_register_entity(mdev, m2m_dev,
 800                         MEM2MEM_ENT_TYPE_SINK, vdev, MEDIA_ENT_F_IO_V4L);
 801         if (ret)
 802                 goto err_rel_entity1;
 803
 804         /* Connect the three entities */
 805         ret = media_create_pad_link(m2m_dev->source, 0, &m2m_dev->proc, 1,
 806                         MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
 807         if (ret)
 808                 goto err_rel_entity2;
 809
 810         ret = media_create_pad_link(&m2m_dev->proc, 0, &m2m_dev->sink, 0,
 811                         MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
 812         if (ret)
 813                 goto err_rm_links0;
 814
 815         /* Create video interface */
 816         m2m_dev->intf_devnode = media_devnode_create(mdev,
 817                         MEDIA_INTF_T_V4L_VIDEO, 0,
 818                         VIDEO_MAJOR, vdev->minor);
 819         if (!m2m_dev->intf_devnode) {
 820                 ret = -ENOMEM;
 821                 goto err_rm_links1;
 822         }
 823
 824         /* Connect the two DMA engines to the interface */
 825         link = media_create_intf_link(m2m_dev->source,
 826                         &m2m_dev->intf_devnode->intf,
 827                         MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
 828         if (!link) {
 829                 ret = -ENOMEM;
 830                 goto err_rm_devnode;
 831         }
 832
 833         link = media_create_intf_link(&m2m_dev->sink,
 834                         &m2m_dev->intf_devnode->intf,
 835                         MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
 836         if (!link) {
 837                 ret = -ENOMEM;
 838                 goto err_rm_intf_link;
 839         }
 840         return 0;
 841
 842 err_rm_intf_link:
 843         media_remove_intf_links(&m2m_dev->intf_devnode->intf);
 844 err_rm_devnode:
 845         media_devnode_remove(m2m_dev->intf_devnode);
 846 err_rm_links1:
 847         media_entity_remove_links(&m2m_dev->sink);
 848 err_rm_links0:
 849         media_entity_remove_links(&m2m_dev->proc);
 850         media_entity_remove_links(m2m_dev->source);
 851 err_rel_entity2:
 852         media_device_unregister_entity(&m2m_dev->proc);
 853         kfree(m2m_dev->proc.name);
 854 err_rel_entity1:
 855         media_device_unregister_entity(&m2m_dev->sink);
 856         kfree(m2m_dev->sink.name);
 857 err_rel_entity0:
 858         media_device_unregister_entity(m2m_dev->source);
 859         kfree(m2m_dev->source->name);
 860         return ret;
 861         return 0;
 862 }
 863 EXPORT_SYMBOL_GPL(v4l2_m2m_register_media_controller);
 864 #endif
 865
 866 struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops)
 867 {
 868         struct v4l2_m2m_dev *m2m_dev;
 869
 870         if (!m2m_ops || WARN_ON(!m2m_ops->device_run))
 871                 return ERR_PTR(-EINVAL);
 872
 873         m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL);
 874         if (!m2m_dev)
 875                 return ERR_PTR(-ENOMEM);
 876
 877         m2m_dev->curr_ctx = NULL;
 878         m2m_dev->m2m_ops = m2m_ops;
 879         INIT_LIST_HEAD(&m2m_dev->job_queue);
 880         spin_lock_init(&m2m_dev->job_spinlock);
 881         INIT_WORK(&m2m_dev->job_work, v4l2_m2m_device_run_work);
 882
 883         return m2m_dev;
 884 }
 885 EXPORT_SYMBOL_GPL(v4l2_m2m_init);
 886
 887 void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev)
 888 {
 889         kfree(m2m_dev);
 890 }
 891 EXPORT_SYMBOL_GPL(v4l2_m2m_release);
 892
 893 struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
 894                 void *drv_priv,
 895                 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq))
 896 {
 897         struct v4l2_m2m_ctx *m2m_ctx;
 898         struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx;
 899         int ret;
 900
 901         m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL);
 902         if (!m2m_ctx)
 903                 return ERR_PTR(-ENOMEM);
 904
 905         m2m_ctx->priv = drv_priv;
 906         m2m_ctx->m2m_dev = m2m_dev;
 907         init_waitqueue_head(&m2m_ctx->finished);
 908
 909         out_q_ctx = &m2m_ctx->out_q_ctx;
 910         cap_q_ctx = &m2m_ctx->cap_q_ctx;
 911
 912         INIT_LIST_HEAD(&out_q_ctx->rdy_queue);
 913         INIT_LIST_HEAD(&cap_q_ctx->rdy_queue);
 914         spin_lock_init(&out_q_ctx->rdy_spinlock);
 915         spin_lock_init(&cap_q_ctx->rdy_spinlock);
 916
 917         INIT_LIST_HEAD(&m2m_ctx->queue);
 918
 919         ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q);
 920
 921         if (ret)
 922                 goto err;
 923         /*
 924          * Both queues should use same the mutex to lock the m2m context.
 925          * This lock is used in some v4l2_m2m_* helpers.
 926          */
 927         if (WARN_ON(out_q_ctx->q.lock != cap_q_ctx->q.lock)) {
 928                 ret = -EINVAL;
 929                 goto err;
 930         }
 931         m2m_ctx->q_lock = out_q_ctx->q.lock;
 932
 933         return m2m_ctx;
 934 err:
 935         kfree(m2m_ctx);
 936         return ERR_PTR(ret);
 937 }
 938 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init);
 939
 940 void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx)
 941 {
 942         /* wait until the current context is dequeued from job_queue */
 943         v4l2_m2m_cancel_job(m2m_ctx);
 944
 945         vb2_queue_release(&m2m_ctx->cap_q_ctx.q);
 946         vb2_queue_release(&m2m_ctx->out_q_ctx.q);
 947
 948         kfree(m2m_ctx);
 949 }
 950 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release);
 951
 952 void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
 953                 struct vb2_v4l2_buffer *vbuf)
 954 {
 955         struct v4l2_m2m_buffer *b = container_of(vbuf,
 956                                 struct v4l2_m2m_buffer, vb);
 957         struct v4l2_m2m_queue_ctx *q_ctx;
 958         unsigned long flags;
 959
 960         q_ctx = get_queue_ctx(m2m_ctx, vbuf->vb2_buf.vb2_queue->type);
 961         if (!q_ctx)
 962                 return;
 963
 964         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 965         list_add_tail(&b->list, &q_ctx->rdy_queue);
 966         q_ctx->num_rdy++;
 967         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 968 }
 969 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue);
 970
 971 void v4l2_m2m_buf_copy_metadata(const struct vb2_v4l2_buffer *out_vb,
 972                                 struct vb2_v4l2_buffer *cap_vb,
 973                                 bool copy_frame_flags)
 974 {
 975         u32 mask = V4L2_BUF_FLAG_TIMECODE | V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
 976
 977         if (copy_frame_flags)
 978                 mask |= V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_PFRAME |
 979                         V4L2_BUF_FLAG_BFRAME;
 980
 981         cap_vb->vb2_buf.timestamp = out_vb->vb2_buf.timestamp;
 982
 983         if (out_vb->flags & V4L2_BUF_FLAG_TIMECODE)
 984                 cap_vb->timecode = out_vb->timecode;
 985         cap_vb->field = out_vb->field;
 986         cap_vb->flags &= ~mask;
 987         cap_vb->flags |= out_vb->flags & mask;
 988         cap_vb->vb2_buf.copied_timestamp = 1;
 989 }
 990 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_copy_metadata);
 991
 992 void v4l2_m2m_request_queue(struct media_request *req)
 993 {
 994         struct media_request_object *obj, *obj_safe;
 995         struct v4l2_m2m_ctx *m2m_ctx = NULL;
 996
 997         /*
 998          * Queue all objects. Note that buffer objects are at the end of the
 999          * objects list, after all other object types. Once buffer objects
1000          * are queued, the driver might delete them immediately (if the driver
1001          * processes the buffer at once), so we have to use
1002          * list_for_each_entry_safe() to handle the case where the object we
1003          * queue is deleted.
1004          */
1005         list_for_each_entry_safe(obj, obj_safe, &req->objects, list) {
1006                 struct v4l2_m2m_ctx *m2m_ctx_obj;
1007                 struct vb2_buffer *vb;
1008
1009                 if (!obj->ops->queue)
1010                         continue;
1011
1012                 if (vb2_request_object_is_buffer(obj)) {
1013                         /* Sanity checks */
1014                         vb = container_of(obj, struct vb2_buffer, req_obj);
1015                         WARN_ON(!V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type));
1016                         m2m_ctx_obj = container_of(vb->vb2_queue,
1017                                                    struct v4l2_m2m_ctx,
1018                                                    out_q_ctx.q);
1019                         WARN_ON(m2m_ctx && m2m_ctx_obj != m2m_ctx);
1020                         m2m_ctx = m2m_ctx_obj;
1021                 }
1022
1023                 /*
1024                  * The buffer we queue here can in theory be immediately
1025                  * unbound, hence the use of list_for_each_entry_safe()
1026                  * above and why we call the queue op last.
1027                  */
1028                 obj->ops->queue(obj);
1029         }
1030
1031         WARN_ON(!m2m_ctx);
1032
1033         if (m2m_ctx)
1034                 v4l2_m2m_try_schedule(m2m_ctx);
1035 }
1036 EXPORT_SYMBOL_GPL(v4l2_m2m_request_queue);
1037
1038 /* Videobuf2 ioctl helpers */
1039
1040 int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
1041                                 struct v4l2_requestbuffers *rb)
1042 {
1043         struct v4l2_fh *fh = file->private_data;
1044
1045         return v4l2_m2m_reqbufs(file, fh->m2m_ctx, rb);
1046 }
1047 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_reqbufs);
1048
1049 int v4l2_m2m_ioctl_create_bufs(struct file *file, void *priv,
1050                                 struct v4l2_create_buffers *create)
1051 {
1052         struct v4l2_fh *fh = file->private_data;
1053
1054         return v4l2_m2m_create_bufs(file, fh->m2m_ctx, create);
1055 }
1056 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_create_bufs);
1057
1058 int v4l2_m2m_ioctl_querybuf(struct file *file, void *priv,
1059                                 struct v4l2_buffer *buf)
1060 {
1061         struct v4l2_fh *fh = file->private_data;
1062
1063         return v4l2_m2m_querybuf(file, fh->m2m_ctx, buf);
1064 }
1065 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_querybuf);
1066
1067 int v4l2_m2m_ioctl_qbuf(struct file *file, void *priv,
1068                                 struct v4l2_buffer *buf)
1069 {
1070         struct v4l2_fh *fh = file->private_data;
1071
1072         return v4l2_m2m_qbuf(file, fh->m2m_ctx, buf);
1073 }
1074 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_qbuf);
1075
1076 int v4l2_m2m_ioctl_dqbuf(struct file *file, void *priv,
1077                                 struct v4l2_buffer *buf)
1078 {
1079         struct v4l2_fh *fh = file->private_data;
1080
1081         return v4l2_m2m_dqbuf(file, fh->m2m_ctx, buf);
1082 }
1083 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_dqbuf);
1084
1085 int v4l2_m2m_ioctl_prepare_buf(struct file *file, void *priv,
1086                                struct v4l2_buffer *buf)
1087 {
1088         struct v4l2_fh *fh = file->private_data;
1089
1090         return v4l2_m2m_prepare_buf(file, fh->m2m_ctx, buf);
1091 }
1092 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_prepare_buf);
1093
1094 int v4l2_m2m_ioctl_expbuf(struct file *file, void *priv,
1095                                 struct v4l2_exportbuffer *eb)
1096 {
1097         struct v4l2_fh *fh = file->private_data;
1098
1099         return v4l2_m2m_expbuf(file, fh->m2m_ctx, eb);
1100 }
1101 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_expbuf);
1102
1103 int v4l2_m2m_ioctl_streamon(struct file *file, void *priv,
1104                                 enum v4l2_buf_type type)
1105 {
1106         struct v4l2_fh *fh = file->private_data;
1107
1108         return v4l2_m2m_streamon(file, fh->m2m_ctx, type);
1109 }
1110 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamon);
1111
1112 int v4l2_m2m_ioctl_streamoff(struct file *file, void *priv,
1113                                 enum v4l2_buf_type type)
1114 {
1115         struct v4l2_fh *fh = file->private_data;
1116
1117         return v4l2_m2m_streamoff(file, fh->m2m_ctx, type);
1118 }
1119 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamoff);
1120
1121 int v4l2_m2m_ioctl_try_encoder_cmd(struct file *file, void *fh,
1122                                    struct v4l2_encoder_cmd *ec)
1123 {
1124         if (ec->cmd != V4L2_ENC_CMD_STOP && ec->cmd != V4L2_ENC_CMD_START)
1125                 return -EINVAL;
1126
1127         ec->flags = 0;
1128         return 0;
1129 }
1130 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_try_encoder_cmd);
1131
1132 int v4l2_m2m_ioctl_try_decoder_cmd(struct file *file, void *fh,
1133                                    struct v4l2_decoder_cmd *dc)
1134 {
1135         if (dc->cmd != V4L2_DEC_CMD_STOP && dc->cmd != V4L2_DEC_CMD_START)
1136                 return -EINVAL;
1137
1138         dc->flags = 0;
1139
1140         if (dc->cmd == V4L2_DEC_CMD_STOP) {
1141                 dc->stop.pts = 0;
1142         } else if (dc->cmd == V4L2_DEC_CMD_START) {
1143                 dc->start.speed = 0;
1144                 dc->start.format = V4L2_DEC_START_FMT_NONE;
1145         }
1146         return 0;
1147 }
1148 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_try_decoder_cmd);
1149
1150 /*
1151  * v4l2_file_operations helpers. It is assumed here same lock is used
1152  * for the output and the capture buffer queue.
1153  */
1154
1155 int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma)
1156 {
1157         struct v4l2_fh *fh = file->private_data;
1158
1159         return v4l2_m2m_mmap(file, fh->m2m_ctx, vma);
1160 }
1161 EXPORT_SYMBOL_GPL(v4l2_m2m_fop_mmap);
1162
1163 __poll_t v4l2_m2m_fop_poll(struct file *file, poll_table *wait)
1164 {
1165         struct v4l2_fh *fh = file->private_data;
1166         struct v4l2_m2m_ctx *m2m_ctx = fh->m2m_ctx;
1167         __poll_t ret;
1168
1169         if (m2m_ctx->q_lock)
1170                 mutex_lock(m2m_ctx->q_lock);
1171
1172         ret = v4l2_m2m_poll(file, m2m_ctx, wait);
1173
1174         if (m2m_ctx->q_lock)
1175                 mutex_unlock(m2m_ctx->q_lock);
1176
1177         return ret;
1178 }
1179 EXPORT_SYMBOL_GPL(v4l2_m2m_fop_poll);
1180