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;
 288         struct vb2_v4l2_buffer *dst, *src;
 289
 290         dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx);
 291
 292         if (!m2m_ctx->out_q_ctx.q.streaming
 293             || !m2m_ctx->cap_q_ctx.q.streaming) {
 294                 dprintk("Streaming needs to be on for both queues\n");
 295                 return;
 296         }
 297
 298         spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
 299
 300         /* If the context is aborted then don't schedule it */
 301         if (m2m_ctx->job_flags & TRANS_ABORT) {
 302                 dprintk("Aborted context\n");
 303                 goto job_unlock;
 304         }
 305
 306         if (m2m_ctx->job_flags & TRANS_QUEUED) {
 307                 dprintk("On job queue already\n");
 308                 goto job_unlock;
 309         }
 310
 311         src = v4l2_m2m_next_src_buf(m2m_ctx);
 312         dst = v4l2_m2m_next_dst_buf(m2m_ctx);
 313         if (!src && !m2m_ctx->out_q_ctx.buffered) {
 314                 dprintk("No input buffers available\n");
 315                 goto job_unlock;
 316         }
 317         if (!dst && !m2m_ctx->cap_q_ctx.buffered) {
 318                 dprintk("No output buffers available\n");
 319                 goto job_unlock;
 320         }
 321
 322         m2m_ctx->new_frame = true;
 323
 324         if (src && dst && dst->is_held &&
 325             dst->vb2_buf.copied_timestamp &&
 326             dst->vb2_buf.timestamp != src->vb2_buf.timestamp) {
 327                 dst->is_held = false;
 328                 v4l2_m2m_dst_buf_remove(m2m_ctx);
 329                 v4l2_m2m_buf_done(dst, VB2_BUF_STATE_DONE);
 330                 dst = v4l2_m2m_next_dst_buf(m2m_ctx);
 331
 332                 if (!dst && !m2m_ctx->cap_q_ctx.buffered) {
 333                         dprintk("No output buffers available after returning held buffer\n");
 334                         goto job_unlock;
 335                 }
 336         }
 337
 338         if (src && dst && (m2m_ctx->out_q_ctx.q.subsystem_flags &
 339                            VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF))
 340                 m2m_ctx->new_frame = !dst->vb2_buf.copied_timestamp ||
 341                         dst->vb2_buf.timestamp != src->vb2_buf.timestamp;
 342
 343         if (m2m_dev->m2m_ops->job_ready
 344                 && (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) {
 345                 dprintk("Driver not ready\n");
 346                 goto job_unlock;
 347         }
 348
 349         list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue);
 350         m2m_ctx->job_flags |= TRANS_QUEUED;
 351
 352 job_unlock:
 353         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
 354 }
 355
 356 /**
 357  * v4l2_m2m_try_schedule() - schedule and possibly run a job for any context
 358  * @m2m_ctx: m2m context
 359  *
 360  * Check if this context is ready to queue a job. If suitable,
 361  * run the next queued job on the mem2mem device.
 362  *
 363  * This function shouldn't run in interrupt context.
 364  *
 365  * Note that v4l2_m2m_try_schedule() can schedule one job for this context,
 366  * and then run another job for another context.
 367  */
 368 void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx)
 369 {
 370         struct v4l2_m2m_dev *m2m_dev = m2m_ctx->m2m_dev;
 371
 372         __v4l2_m2m_try_queue(m2m_dev, m2m_ctx);
 373         v4l2_m2m_try_run(m2m_dev);
 374 }
 375 EXPORT_SYMBOL_GPL(v4l2_m2m_try_schedule);
 376
 377 /**
 378  * v4l2_m2m_device_run_work() - run pending jobs for the context
 379  * @work: Work structure used for scheduling the execution of this function.
 380  */
 381 static void v4l2_m2m_device_run_work(struct work_struct *work)
 382 {
 383         struct v4l2_m2m_dev *m2m_dev =
 384                 container_of(work, struct v4l2_m2m_dev, job_work);
 385
 386         v4l2_m2m_try_run(m2m_dev);
 387 }
 388
 389 /**
 390  * v4l2_m2m_cancel_job() - cancel pending jobs for the context
 391  * @m2m_ctx: m2m context with jobs to be canceled
 392  *
 393  * In case of streamoff or release called on any context,
 394  * 1] If the context is currently running, then abort job will be called
 395  * 2] If the context is queued, then the context will be removed from
 396  *    the job_queue
 397  */
 398 static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx *m2m_ctx)
 399 {
 400         struct v4l2_m2m_dev *m2m_dev;
 401         unsigned long flags;
 402
 403         m2m_dev = m2m_ctx->m2m_dev;
 404         spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
 405
 406         m2m_ctx->job_flags |= TRANS_ABORT;
 407         if (m2m_ctx->job_flags & TRANS_RUNNING) {
 408                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 409                 if (m2m_dev->m2m_ops->job_abort)
 410                         m2m_dev->m2m_ops->job_abort(m2m_ctx->priv);
 411                 dprintk("m2m_ctx %p running, will wait to complete\n", m2m_ctx);
 412                 wait_event(m2m_ctx->finished,
 413                                 !(m2m_ctx->job_flags & TRANS_RUNNING));
 414         } else if (m2m_ctx->job_flags & TRANS_QUEUED) {
 415                 list_del(&m2m_ctx->queue);
 416                 m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
 417                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 418                 dprintk("m2m_ctx: %p had been on queue and was removed\n",
 419                         m2m_ctx);
 420         } else {
 421                 /* Do nothing, was not on queue/running */
 422                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 423         }
 424 }
 425
 426 /*
 427  * Schedule the next job, called from v4l2_m2m_job_finish() or
 428  * v4l2_m2m_buf_done_and_job_finish().
 429  */
 430 static void v4l2_m2m_schedule_next_job(struct v4l2_m2m_dev *m2m_dev,
 431                                        struct v4l2_m2m_ctx *m2m_ctx)
 432 {
 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          */
 438         __v4l2_m2m_try_queue(m2m_dev, m2m_ctx);
 439
 440         /*
 441          * We might be running in atomic context,
 442          * but the job must be run in non-atomic context.
 443          */
 444         schedule_work(&m2m_dev->job_work);
 445 }
 446
 447 /*
 448  * Assumes job_spinlock is held, called from v4l2_m2m_job_finish() or
 449  * v4l2_m2m_buf_done_and_job_finish().
 450  */
 451 static bool _v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
 452                                  struct v4l2_m2m_ctx *m2m_ctx)
 453 {
 454         if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) {
 455                 dprintk("Called by an instance not currently running\n");
 456                 return false;
 457         }
 458
 459         list_del(&m2m_dev->curr_ctx->queue);
 460         m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
 461         wake_up(&m2m_dev->curr_ctx->finished);
 462         m2m_dev->curr_ctx = NULL;
 463         return true;
 464 }
 465
 466 void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
 467                          struct v4l2_m2m_ctx *m2m_ctx)
 468 {
 469         unsigned long flags;
 470         bool schedule_next;
 471
 472         /*
 473          * This function should not be used for drivers that support
 474          * holding capture buffers. Those should use
 475          * v4l2_m2m_buf_done_and_job_finish() instead.
 476          */
 477         WARN_ON(m2m_ctx->out_q_ctx.q.subsystem_flags &
 478                 VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF);
 479         spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
 480         schedule_next = _v4l2_m2m_job_finish(m2m_dev, m2m_ctx);
 481         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 482
 483         if (schedule_next)
 484                 v4l2_m2m_schedule_next_job(m2m_dev, m2m_ctx);
 485 }
 486 EXPORT_SYMBOL(v4l2_m2m_job_finish);
 487
 488 void v4l2_m2m_buf_done_and_job_finish(struct v4l2_m2m_dev *m2m_dev,
 489                                       struct v4l2_m2m_ctx *m2m_ctx,
 490                                       enum vb2_buffer_state state)
 491 {
 492         struct vb2_v4l2_buffer *src_buf, *dst_buf;
 493         bool schedule_next = false;
 494         unsigned long flags;
 495
 496         spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
 497         src_buf = v4l2_m2m_src_buf_remove(m2m_ctx);
 498         dst_buf = v4l2_m2m_next_dst_buf(m2m_ctx);
 499
 500         if (WARN_ON(!src_buf || !dst_buf))
 501                 goto unlock;
 502         v4l2_m2m_buf_done(src_buf, state);
 503         dst_buf->is_held = src_buf->flags & V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
 504         if (!dst_buf->is_held) {
 505                 v4l2_m2m_dst_buf_remove(m2m_ctx);
 506                 v4l2_m2m_buf_done(dst_buf, state);
 507         }
 508         schedule_next = _v4l2_m2m_job_finish(m2m_dev, m2m_ctx);
 509 unlock:
 510         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 511
 512         if (schedule_next)
 513                 v4l2_m2m_schedule_next_job(m2m_dev, m2m_ctx);
 514 }
 515 EXPORT_SYMBOL(v4l2_m2m_buf_done_and_job_finish);
 516
 517 int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 518                      struct v4l2_requestbuffers *reqbufs)
 519 {
 520         struct vb2_queue *vq;
 521         int ret;
 522
 523         vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type);
 524         ret = vb2_reqbufs(vq, reqbufs);
 525         /* If count == 0, then the owner has released all buffers and he
 526            is no longer owner of the queue. Otherwise we have an owner. */
 527         if (ret == 0)
 528                 vq->owner = reqbufs->count ? file->private_data : NULL;
 529
 530         return ret;
 531 }
 532 EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs);
 533
 534 int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 535                       struct v4l2_buffer *buf)
 536 {
 537         struct vb2_queue *vq;
 538         int ret = 0;
 539         unsigned int i;
 540
 541         vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
 542         ret = vb2_querybuf(vq, buf);
 543
 544         /* Adjust MMAP memory offsets for the CAPTURE queue */
 545         if (buf->memory == V4L2_MEMORY_MMAP && !V4L2_TYPE_IS_OUTPUT(vq->type)) {
 546                 if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) {
 547                         for (i = 0; i < buf->length; ++i)
 548                                 buf->m.planes[i].m.mem_offset
 549                                         += DST_QUEUE_OFF_BASE;
 550                 } else {
 551                         buf->m.offset += DST_QUEUE_OFF_BASE;
 552                 }
 553         }
 554
 555         return ret;
 556 }
 557 EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf);
 558
 559 int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 560                   struct v4l2_buffer *buf)
 561 {
 562         struct video_device *vdev = video_devdata(file);
 563         struct vb2_queue *vq;
 564         int ret;
 565
 566         vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
 567         if (!V4L2_TYPE_IS_OUTPUT(vq->type) &&
 568             (buf->flags & V4L2_BUF_FLAG_REQUEST_FD)) {
 569                 dprintk("%s: requests cannot be used with capture buffers\n",
 570                         __func__);
 571                 return -EPERM;
 572         }
 573         ret = vb2_qbuf(vq, vdev->v4l2_dev->mdev, buf);
 574         if (!ret && !(buf->flags & V4L2_BUF_FLAG_IN_REQUEST))
 575                 v4l2_m2m_try_schedule(m2m_ctx);
 576
 577         return ret;
 578 }
 579 EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf);
 580
 581 int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 582                    struct v4l2_buffer *buf)
 583 {
 584         struct vb2_queue *vq;
 585
 586         vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
 587         return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK);
 588 }
 589 EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf);
 590
 591 int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 592                          struct v4l2_buffer *buf)
 593 {
 594         struct video_device *vdev = video_devdata(file);
 595         struct vb2_queue *vq;
 596
 597         vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
 598         return vb2_prepare_buf(vq, vdev->v4l2_dev->mdev, buf);
 599 }
 600 EXPORT_SYMBOL_GPL(v4l2_m2m_prepare_buf);
 601
 602 int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 603                          struct v4l2_create_buffers *create)
 604 {
 605         struct vb2_queue *vq;
 606
 607         vq = v4l2_m2m_get_vq(m2m_ctx, create->format.type);
 608         return vb2_create_bufs(vq, create);
 609 }
 610 EXPORT_SYMBOL_GPL(v4l2_m2m_create_bufs);
 611
 612 int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 613                   struct v4l2_exportbuffer *eb)
 614 {
 615         struct vb2_queue *vq;
 616
 617         vq = v4l2_m2m_get_vq(m2m_ctx, eb->type);
 618         return vb2_expbuf(vq, eb);
 619 }
 620 EXPORT_SYMBOL_GPL(v4l2_m2m_expbuf);
 621
 622 int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 623                       enum v4l2_buf_type type)
 624 {
 625         struct vb2_queue *vq;
 626         int ret;
 627
 628         vq = v4l2_m2m_get_vq(m2m_ctx, type);
 629         ret = vb2_streamon(vq, type);
 630         if (!ret)
 631                 v4l2_m2m_try_schedule(m2m_ctx);
 632
 633         return ret;
 634 }
 635 EXPORT_SYMBOL_GPL(v4l2_m2m_streamon);
 636
 637 int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 638                        enum v4l2_buf_type type)
 639 {
 640         struct v4l2_m2m_dev *m2m_dev;
 641         struct v4l2_m2m_queue_ctx *q_ctx;
 642         unsigned long flags_job, flags;
 643         int ret;
 644
 645         /* wait until the current context is dequeued from job_queue */
 646         v4l2_m2m_cancel_job(m2m_ctx);
 647
 648         q_ctx = get_queue_ctx(m2m_ctx, type);
 649         ret = vb2_streamoff(&q_ctx->q, type);
 650         if (ret)
 651                 return ret;
 652
 653         m2m_dev = m2m_ctx->m2m_dev;
 654         spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
 655         /* We should not be scheduled anymore, since we're dropping a queue. */
 656         if (m2m_ctx->job_flags & TRANS_QUEUED)
 657                 list_del(&m2m_ctx->queue);
 658         m2m_ctx->job_flags = 0;
 659
 660         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
 661         /* Drop queue, since streamoff returns device to the same state as after
 662          * calling reqbufs. */
 663         INIT_LIST_HEAD(&q_ctx->rdy_queue);
 664         q_ctx->num_rdy = 0;
 665         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
 666
 667         if (m2m_dev->curr_ctx == m2m_ctx) {
 668                 m2m_dev->curr_ctx = NULL;
 669                 wake_up(&m2m_ctx->finished);
 670         }
 671         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
 672
 673         return 0;
 674 }
 675 EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff);
 676
 677 static __poll_t v4l2_m2m_poll_for_data(struct file *file,
 678                                        struct v4l2_m2m_ctx *m2m_ctx,
 679                                        struct poll_table_struct *wait)
 680 {
 681         struct vb2_queue *src_q, *dst_q;
 682         struct vb2_buffer *src_vb = NULL, *dst_vb = NULL;
 683         __poll_t rc = 0;
 684         unsigned long flags;
 685
 686         src_q = v4l2_m2m_get_src_vq(m2m_ctx);
 687         dst_q = v4l2_m2m_get_dst_vq(m2m_ctx);
 688
 689         poll_wait(file, &src_q->done_wq, wait);
 690         poll_wait(file, &dst_q->done_wq, wait);
 691
 692         /*
 693          * There has to be at least one buffer queued on each queued_list, which
 694          * means either in driver already or waiting for driver to claim it
 695          * and start processing.
 696          */
 697         if ((!src_q->streaming || src_q->error ||
 698              list_empty(&src_q->queued_list)) &&
 699             (!dst_q->streaming || dst_q->error ||
 700              list_empty(&dst_q->queued_list)))
 701                 return EPOLLERR;
 702
 703         spin_lock_irqsave(&dst_q->done_lock, flags);
 704         if (list_empty(&dst_q->done_list)) {
 705                 /*
 706                  * If the last buffer was dequeued from the capture queue,
 707                  * return immediately. DQBUF will return -EPIPE.
 708                  */
 709                 if (dst_q->last_buffer_dequeued) {
 710                         spin_unlock_irqrestore(&dst_q->done_lock, flags);
 711                         return EPOLLIN | EPOLLRDNORM;
 712                 }
 713         }
 714         spin_unlock_irqrestore(&dst_q->done_lock, flags);
 715
 716         spin_lock_irqsave(&src_q->done_lock, flags);
 717         if (!list_empty(&src_q->done_list))
 718                 src_vb = list_first_entry(&src_q->done_list, struct vb2_buffer,
 719                                                 done_entry);
 720         if (src_vb && (src_vb->state == VB2_BUF_STATE_DONE
 721                         || src_vb->state == VB2_BUF_STATE_ERROR))
 722                 rc |= EPOLLOUT | EPOLLWRNORM;
 723         spin_unlock_irqrestore(&src_q->done_lock, flags);
 724
 725         spin_lock_irqsave(&dst_q->done_lock, flags);
 726         if (!list_empty(&dst_q->done_list))
 727                 dst_vb = list_first_entry(&dst_q->done_list, struct vb2_buffer,
 728                                                 done_entry);
 729         if (dst_vb && (dst_vb->state == VB2_BUF_STATE_DONE
 730                         || dst_vb->state == VB2_BUF_STATE_ERROR))
 731                 rc |= EPOLLIN | EPOLLRDNORM;
 732         spin_unlock_irqrestore(&dst_q->done_lock, flags);
 733
 734         return rc;
 735 }
 736
 737 __poll_t v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 738                        struct poll_table_struct *wait)
 739 {
 740         struct video_device *vfd = video_devdata(file);
 741         __poll_t req_events = poll_requested_events(wait);
 742         __poll_t rc = 0;
 743
 744         if (req_events & (EPOLLOUT | EPOLLWRNORM | EPOLLIN | EPOLLRDNORM))
 745                 rc = v4l2_m2m_poll_for_data(file, m2m_ctx, wait);
 746
 747         if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
 748                 struct v4l2_fh *fh = file->private_data;
 749
 750                 poll_wait(file, &fh->wait, wait);
 751                 if (v4l2_event_pending(fh))
 752                         rc |= EPOLLPRI;
 753         }
 754
 755         return rc;
 756 }
 757 EXPORT_SYMBOL_GPL(v4l2_m2m_poll);
 758
 759 int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 760                          struct vm_area_struct *vma)
 761 {
 762         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 763         struct vb2_queue *vq;
 764
 765         if (offset < DST_QUEUE_OFF_BASE) {
 766                 vq = v4l2_m2m_get_src_vq(m2m_ctx);
 767         } else {
 768                 vq = v4l2_m2m_get_dst_vq(m2m_ctx);
 769                 vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT);
 770         }
 771
 772         return vb2_mmap(vq, vma);
 773 }
 774 EXPORT_SYMBOL(v4l2_m2m_mmap);
 775
 776 #if defined(CONFIG_MEDIA_CONTROLLER)
 777 void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev)
 778 {
 779         media_remove_intf_links(&m2m_dev->intf_devnode->intf);
 780         media_devnode_remove(m2m_dev->intf_devnode);
 781
 782         media_entity_remove_links(m2m_dev->source);
 783         media_entity_remove_links(&m2m_dev->sink);
 784         media_entity_remove_links(&m2m_dev->proc);
 785         media_device_unregister_entity(m2m_dev->source);
 786         media_device_unregister_entity(&m2m_dev->sink);
 787         media_device_unregister_entity(&m2m_dev->proc);
 788         kfree(m2m_dev->source->name);
 789         kfree(m2m_dev->sink.name);
 790         kfree(m2m_dev->proc.name);
 791 }
 792 EXPORT_SYMBOL_GPL(v4l2_m2m_unregister_media_controller);
 793
 794 static int v4l2_m2m_register_entity(struct media_device *mdev,
 795         struct v4l2_m2m_dev *m2m_dev, enum v4l2_m2m_entity_type type,
 796         struct video_device *vdev, int function)
 797 {
 798         struct media_entity *entity;
 799         struct media_pad *pads;
 800         char *name;
 801         unsigned int len;
 802         int num_pads;
 803         int ret;
 804
 805         switch (type) {
 806         case MEM2MEM_ENT_TYPE_SOURCE:
 807                 entity = m2m_dev->source;
 808                 pads = &m2m_dev->source_pad;
 809                 pads[0].flags = MEDIA_PAD_FL_SOURCE;
 810                 num_pads = 1;
 811                 break;
 812         case MEM2MEM_ENT_TYPE_SINK:
 813                 entity = &m2m_dev->sink;
 814                 pads = &m2m_dev->sink_pad;
 815                 pads[0].flags = MEDIA_PAD_FL_SINK;
 816                 num_pads = 1;
 817                 break;
 818         case MEM2MEM_ENT_TYPE_PROC:
 819                 entity = &m2m_dev->proc;
 820                 pads = m2m_dev->proc_pads;
 821                 pads[0].flags = MEDIA_PAD_FL_SINK;
 822                 pads[1].flags = MEDIA_PAD_FL_SOURCE;
 823                 num_pads = 2;
 824                 break;
 825         default:
 826                 return -EINVAL;
 827         }
 828
 829         entity->obj_type = MEDIA_ENTITY_TYPE_BASE;
 830         if (type != MEM2MEM_ENT_TYPE_PROC) {
 831                 entity->info.dev.major = VIDEO_MAJOR;
 832                 entity->info.dev.minor = vdev->minor;
 833         }
 834         len = strlen(vdev->name) + 2 + strlen(m2m_entity_name[type]);
 835         name = kmalloc(len, GFP_KERNEL);
 836         if (!name)
 837                 return -ENOMEM;
 838         snprintf(name, len, "%s-%s", vdev->name, m2m_entity_name[type]);
 839         entity->name = name;
 840         entity->function = function;
 841
 842         ret = media_entity_pads_init(entity, num_pads, pads);
 843         if (ret)
 844                 return ret;
 845         ret = media_device_register_entity(mdev, entity);
 846         if (ret)
 847                 return ret;
 848
 849         return 0;
 850 }
 851
 852 int v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
 853                 struct video_device *vdev, int function)
 854 {
 855         struct media_device *mdev = vdev->v4l2_dev->mdev;
 856         struct media_link *link;
 857         int ret;
 858
 859         if (!mdev)
 860                 return 0;
 861
 862         /* A memory-to-memory device consists in two
 863          * DMA engine and one video processing entities.
 864          * The DMA engine entities are linked to a V4L interface
 865          */
 866
 867         /* Create the three entities with their pads */
 868         m2m_dev->source = &vdev->entity;
 869         ret = v4l2_m2m_register_entity(mdev, m2m_dev,
 870                         MEM2MEM_ENT_TYPE_SOURCE, vdev, MEDIA_ENT_F_IO_V4L);
 871         if (ret)
 872                 return ret;
 873         ret = v4l2_m2m_register_entity(mdev, m2m_dev,
 874                         MEM2MEM_ENT_TYPE_PROC, vdev, function);
 875         if (ret)
 876                 goto err_rel_entity0;
 877         ret = v4l2_m2m_register_entity(mdev, m2m_dev,
 878                         MEM2MEM_ENT_TYPE_SINK, vdev, MEDIA_ENT_F_IO_V4L);
 879         if (ret)
 880                 goto err_rel_entity1;
 881
 882         /* Connect the three entities */
 883         ret = media_create_pad_link(m2m_dev->source, 0, &m2m_dev->proc, 1,
 884                         MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
 885         if (ret)
 886                 goto err_rel_entity2;
 887
 888         ret = media_create_pad_link(&m2m_dev->proc, 0, &m2m_dev->sink, 0,
 889                         MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
 890         if (ret)
 891                 goto err_rm_links0;
 892
 893         /* Create video interface */
 894         m2m_dev->intf_devnode = media_devnode_create(mdev,
 895                         MEDIA_INTF_T_V4L_VIDEO, 0,
 896                         VIDEO_MAJOR, vdev->minor);
 897         if (!m2m_dev->intf_devnode) {
 898                 ret = -ENOMEM;
 899                 goto err_rm_links1;
 900         }
 901
 902         /* Connect the two DMA engines to the interface */
 903         link = media_create_intf_link(m2m_dev->source,
 904                         &m2m_dev->intf_devnode->intf,
 905                         MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
 906         if (!link) {
 907                 ret = -ENOMEM;
 908                 goto err_rm_devnode;
 909         }
 910
 911         link = media_create_intf_link(&m2m_dev->sink,
 912                         &m2m_dev->intf_devnode->intf,
 913                         MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
 914         if (!link) {
 915                 ret = -ENOMEM;
 916                 goto err_rm_intf_link;
 917         }
 918         return 0;
 919
 920 err_rm_intf_link:
 921         media_remove_intf_links(&m2m_dev->intf_devnode->intf);
 922 err_rm_devnode:
 923         media_devnode_remove(m2m_dev->intf_devnode);
 924 err_rm_links1:
 925         media_entity_remove_links(&m2m_dev->sink);
 926 err_rm_links0:
 927         media_entity_remove_links(&m2m_dev->proc);
 928         media_entity_remove_links(m2m_dev->source);
 929 err_rel_entity2:
 930         media_device_unregister_entity(&m2m_dev->proc);
 931         kfree(m2m_dev->proc.name);
 932 err_rel_entity1:
 933         media_device_unregister_entity(&m2m_dev->sink);
 934         kfree(m2m_dev->sink.name);
 935 err_rel_entity0:
 936         media_device_unregister_entity(m2m_dev->source);
 937         kfree(m2m_dev->source->name);
 938         return ret;
 939         return 0;
 940 }
 941 EXPORT_SYMBOL_GPL(v4l2_m2m_register_media_controller);
 942 #endif
 943
 944 struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops)
 945 {
 946         struct v4l2_m2m_dev *m2m_dev;
 947
 948         if (!m2m_ops || WARN_ON(!m2m_ops->device_run))
 949                 return ERR_PTR(-EINVAL);
 950
 951         m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL);
 952         if (!m2m_dev)
 953                 return ERR_PTR(-ENOMEM);
 954
 955         m2m_dev->curr_ctx = NULL;
 956         m2m_dev->m2m_ops = m2m_ops;
 957         INIT_LIST_HEAD(&m2m_dev->job_queue);
 958         spin_lock_init(&m2m_dev->job_spinlock);
 959         INIT_WORK(&m2m_dev->job_work, v4l2_m2m_device_run_work);
 960
 961         return m2m_dev;
 962 }
 963 EXPORT_SYMBOL_GPL(v4l2_m2m_init);
 964
 965 void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev)
 966 {
 967         kfree(m2m_dev);
 968 }
 969 EXPORT_SYMBOL_GPL(v4l2_m2m_release);
 970
 971 struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
 972                 void *drv_priv,
 973                 int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq))
 974 {
 975         struct v4l2_m2m_ctx *m2m_ctx;
 976         struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx;
 977         int ret;
 978
 979         m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL);
 980         if (!m2m_ctx)
 981                 return ERR_PTR(-ENOMEM);
 982
 983         m2m_ctx->priv = drv_priv;
 984         m2m_ctx->m2m_dev = m2m_dev;
 985         init_waitqueue_head(&m2m_ctx->finished);
 986
 987         out_q_ctx = &m2m_ctx->out_q_ctx;
 988         cap_q_ctx = &m2m_ctx->cap_q_ctx;
 989
 990         INIT_LIST_HEAD(&out_q_ctx->rdy_queue);
 991         INIT_LIST_HEAD(&cap_q_ctx->rdy_queue);
 992         spin_lock_init(&out_q_ctx->rdy_spinlock);
 993         spin_lock_init(&cap_q_ctx->rdy_spinlock);
 994
 995         INIT_LIST_HEAD(&m2m_ctx->queue);
 996
 997         ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q);
 998
 999         if (ret)
1000                 goto err;
1001         /*
1002          * Both queues should use same the mutex to lock the m2m context.
1003          * This lock is used in some v4l2_m2m_* helpers.
1004          */
1005         if (WARN_ON(out_q_ctx->q.lock != cap_q_ctx->q.lock)) {
1006                 ret = -EINVAL;
1007                 goto err;
1008         }
1009         m2m_ctx->q_lock = out_q_ctx->q.lock;
1010
1011         return m2m_ctx;
1012 err:
1013         kfree(m2m_ctx);
1014         return ERR_PTR(ret);
1015 }
1016 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init);
1017
1018 void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx)
1019 {
1020         /* wait until the current context is dequeued from job_queue */
1021         v4l2_m2m_cancel_job(m2m_ctx);
1022
1023         vb2_queue_release(&m2m_ctx->cap_q_ctx.q);
1024         vb2_queue_release(&m2m_ctx->out_q_ctx.q);
1025
1026         kfree(m2m_ctx);
1027 }
1028 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release);
1029
1030 void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
1031                 struct vb2_v4l2_buffer *vbuf)
1032 {
1033         struct v4l2_m2m_buffer *b = container_of(vbuf,
1034                                 struct v4l2_m2m_buffer, vb);
1035         struct v4l2_m2m_queue_ctx *q_ctx;
1036         unsigned long flags;
1037
1038         q_ctx = get_queue_ctx(m2m_ctx, vbuf->vb2_buf.vb2_queue->type);
1039         if (!q_ctx)
1040                 return;
1041
1042         spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
1043         list_add_tail(&b->list, &q_ctx->rdy_queue);
1044         q_ctx->num_rdy++;
1045         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
1046 }
1047 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue);
1048
1049 void v4l2_m2m_buf_copy_metadata(const struct vb2_v4l2_buffer *out_vb,
1050                                 struct vb2_v4l2_buffer *cap_vb,
1051                                 bool copy_frame_flags)
1052 {
1053         u32 mask = V4L2_BUF_FLAG_TIMECODE | V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
1054
1055         if (copy_frame_flags)
1056                 mask |= V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_PFRAME |
1057                         V4L2_BUF_FLAG_BFRAME;
1058
1059         cap_vb->vb2_buf.timestamp = out_vb->vb2_buf.timestamp;
1060
1061         if (out_vb->flags & V4L2_BUF_FLAG_TIMECODE)
1062                 cap_vb->timecode = out_vb->timecode;
1063         cap_vb->field = out_vb->field;
1064         cap_vb->flags &= ~mask;
1065         cap_vb->flags |= out_vb->flags & mask;
1066         cap_vb->vb2_buf.copied_timestamp = 1;
1067 }
1068 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_copy_metadata);
1069
1070 void v4l2_m2m_request_queue(struct media_request *req)
1071 {
1072         struct media_request_object *obj, *obj_safe;
1073         struct v4l2_m2m_ctx *m2m_ctx = NULL;
1074
1075         /*
1076          * Queue all objects. Note that buffer objects are at the end of the
1077          * objects list, after all other object types. Once buffer objects
1078          * are queued, the driver might delete them immediately (if the driver
1079          * processes the buffer at once), so we have to use
1080          * list_for_each_entry_safe() to handle the case where the object we
1081          * queue is deleted.
1082          */
1083         list_for_each_entry_safe(obj, obj_safe, &req->objects, list) {
1084                 struct v4l2_m2m_ctx *m2m_ctx_obj;
1085                 struct vb2_buffer *vb;
1086
1087                 if (!obj->ops->queue)
1088                         continue;
1089
1090                 if (vb2_request_object_is_buffer(obj)) {
1091                         /* Sanity checks */
1092                         vb = container_of(obj, struct vb2_buffer, req_obj);
1093                         WARN_ON(!V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type));
1094                         m2m_ctx_obj = container_of(vb->vb2_queue,
1095                                                    struct v4l2_m2m_ctx,
1096                                                    out_q_ctx.q);
1097                         WARN_ON(m2m_ctx && m2m_ctx_obj != m2m_ctx);
1098                         m2m_ctx = m2m_ctx_obj;
1099                 }
1100
1101                 /*
1102                  * The buffer we queue here can in theory be immediately
1103                  * unbound, hence the use of list_for_each_entry_safe()
1104                  * above and why we call the queue op last.
1105                  */
1106                 obj->ops->queue(obj);
1107         }
1108
1109         WARN_ON(!m2m_ctx);
1110
1111         if (m2m_ctx)
1112                 v4l2_m2m_try_schedule(m2m_ctx);
1113 }
1114 EXPORT_SYMBOL_GPL(v4l2_m2m_request_queue);
1115
1116 /* Videobuf2 ioctl helpers */
1117
1118 int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
1119                                 struct v4l2_requestbuffers *rb)
1120 {
1121         struct v4l2_fh *fh = file->private_data;
1122
1123         return v4l2_m2m_reqbufs(file, fh->m2m_ctx, rb);
1124 }
1125 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_reqbufs);
1126
1127 int v4l2_m2m_ioctl_create_bufs(struct file *file, void *priv,
1128                                 struct v4l2_create_buffers *create)
1129 {
1130         struct v4l2_fh *fh = file->private_data;
1131
1132         return v4l2_m2m_create_bufs(file, fh->m2m_ctx, create);
1133 }
1134 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_create_bufs);
1135
1136 int v4l2_m2m_ioctl_querybuf(struct file *file, void *priv,
1137                                 struct v4l2_buffer *buf)
1138 {
1139         struct v4l2_fh *fh = file->private_data;
1140
1141         return v4l2_m2m_querybuf(file, fh->m2m_ctx, buf);
1142 }
1143 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_querybuf);
1144
1145 int v4l2_m2m_ioctl_qbuf(struct file *file, void *priv,
1146                                 struct v4l2_buffer *buf)
1147 {
1148         struct v4l2_fh *fh = file->private_data;
1149
1150         return v4l2_m2m_qbuf(file, fh->m2m_ctx, buf);
1151 }
1152 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_qbuf);
1153
1154 int v4l2_m2m_ioctl_dqbuf(struct file *file, void *priv,
1155                                 struct v4l2_buffer *buf)
1156 {
1157         struct v4l2_fh *fh = file->private_data;
1158
1159         return v4l2_m2m_dqbuf(file, fh->m2m_ctx, buf);
1160 }
1161 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_dqbuf);
1162
1163 int v4l2_m2m_ioctl_prepare_buf(struct file *file, void *priv,
1164                                struct v4l2_buffer *buf)
1165 {
1166         struct v4l2_fh *fh = file->private_data;
1167
1168         return v4l2_m2m_prepare_buf(file, fh->m2m_ctx, buf);
1169 }
1170 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_prepare_buf);
1171
1172 int v4l2_m2m_ioctl_expbuf(struct file *file, void *priv,
1173                                 struct v4l2_exportbuffer *eb)
1174 {
1175         struct v4l2_fh *fh = file->private_data;
1176
1177         return v4l2_m2m_expbuf(file, fh->m2m_ctx, eb);
1178 }
1179 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_expbuf);
1180
1181 int v4l2_m2m_ioctl_streamon(struct file *file, void *priv,
1182                                 enum v4l2_buf_type type)
1183 {
1184         struct v4l2_fh *fh = file->private_data;
1185
1186         return v4l2_m2m_streamon(file, fh->m2m_ctx, type);
1187 }
1188 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamon);
1189
1190 int v4l2_m2m_ioctl_streamoff(struct file *file, void *priv,
1191                                 enum v4l2_buf_type type)
1192 {
1193         struct v4l2_fh *fh = file->private_data;
1194
1195         return v4l2_m2m_streamoff(file, fh->m2m_ctx, type);
1196 }
1197 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamoff);
1198
1199 int v4l2_m2m_ioctl_try_encoder_cmd(struct file *file, void *fh,
1200                                    struct v4l2_encoder_cmd *ec)
1201 {
1202         if (ec->cmd != V4L2_ENC_CMD_STOP && ec->cmd != V4L2_ENC_CMD_START)
1203                 return -EINVAL;
1204
1205         ec->flags = 0;
1206         return 0;
1207 }
1208 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_try_encoder_cmd);
1209
1210 int v4l2_m2m_ioctl_try_decoder_cmd(struct file *file, void *fh,
1211                                    struct v4l2_decoder_cmd *dc)
1212 {
1213         if (dc->cmd != V4L2_DEC_CMD_STOP && dc->cmd != V4L2_DEC_CMD_START)
1214                 return -EINVAL;
1215
1216         dc->flags = 0;
1217
1218         if (dc->cmd == V4L2_DEC_CMD_STOP) {
1219                 dc->stop.pts = 0;
1220         } else if (dc->cmd == V4L2_DEC_CMD_START) {
1221                 dc->start.speed = 0;
1222                 dc->start.format = V4L2_DEC_START_FMT_NONE;
1223         }
1224         return 0;
1225 }
1226 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_try_decoder_cmd);
1227
1228 int v4l2_m2m_ioctl_stateless_try_decoder_cmd(struct file *file, void *fh,
1229                                              struct v4l2_decoder_cmd *dc)
1230 {
1231         if (dc->cmd != V4L2_DEC_CMD_FLUSH)
1232                 return -EINVAL;
1233
1234         dc->flags = 0;
1235
1236         return 0;
1237 }
1238 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_stateless_try_decoder_cmd);
1239
1240 int v4l2_m2m_ioctl_stateless_decoder_cmd(struct file *file, void *priv,
1241                                          struct v4l2_decoder_cmd *dc)
1242 {
1243         struct v4l2_fh *fh = file->private_data;
1244         struct vb2_v4l2_buffer *out_vb, *cap_vb;
1245         struct v4l2_m2m_dev *m2m_dev = fh->m2m_ctx->m2m_dev;
1246         unsigned long flags;
1247         int ret;
1248
1249         ret = v4l2_m2m_ioctl_stateless_try_decoder_cmd(file, priv, dc);
1250         if (ret < 0)
1251                 return ret;
1252
1253         spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
1254         out_vb = v4l2_m2m_last_src_buf(fh->m2m_ctx);
1255         cap_vb = v4l2_m2m_last_dst_buf(fh->m2m_ctx);
1256
1257         /*
1258          * If there is an out buffer pending, then clear any HOLD flag.
1259          *
1260          * By clearing this flag we ensure that when this output
1261          * buffer is processed any held capture buffer will be released.
1262          */
1263         if (out_vb) {
1264                 out_vb->flags &= ~V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
1265         } else if (cap_vb && cap_vb->is_held) {
1266                 /*
1267                  * If there were no output buffers, but there is a
1268                  * capture buffer that is held, then release that
1269                  * buffer.
1270                  */
1271                 cap_vb->is_held = false;
1272                 v4l2_m2m_dst_buf_remove(fh->m2m_ctx);
1273                 v4l2_m2m_buf_done(cap_vb, VB2_BUF_STATE_DONE);
1274         }
1275         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
1276
1277         return 0;
1278 }
1279 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_stateless_decoder_cmd);
1280
1281 /*
1282  * v4l2_file_operations helpers. It is assumed here same lock is used
1283  * for the output and the capture buffer queue.
1284  */
1285
1286 int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma)
1287 {
1288         struct v4l2_fh *fh = file->private_data;
1289
1290         return v4l2_m2m_mmap(file, fh->m2m_ctx, vma);
1291 }
1292 EXPORT_SYMBOL_GPL(v4l2_m2m_fop_mmap);
1293
1294 __poll_t v4l2_m2m_fop_poll(struct file *file, poll_table *wait)
1295 {
1296         struct v4l2_fh *fh = file->private_data;
1297         struct v4l2_m2m_ctx *m2m_ctx = fh->m2m_ctx;
1298         __poll_t ret;
1299
1300         if (m2m_ctx->q_lock)
1301                 mutex_lock(m2m_ctx->q_lock);
1302
1303         ret = v4l2_m2m_poll(file, m2m_ctx, wait);
1304
1305         if (m2m_ctx->q_lock)
1306                 mutex_unlock(m2m_ctx->q_lock);
1307
1308         return ret;
1309 }
1310 EXPORT_SYMBOL_GPL(v4l2_m2m_fop_poll);
1311