summaryrefslogtreecommitdiffstats
path: root/drivers/media/v4l2-core/v4l2-mem2mem.c
blob: 3392833d95411232e5a36f3b9cdc7623c82174c1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
/*
 * Memory-to-memory device framework for Video for Linux 2 and videobuf.
 *
 * Helper functions for devices that use videobuf buffers for both their
 * source and destination.
 *
 * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd.
 * Pawel Osciak, <pawel@osciak.com>
 * Marek Szyprowski, <m.szyprowski@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 */
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>

#include <media/media-device.h>
#include <media/videobuf2-v4l2.h>
#include <media/v4l2-mem2mem.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>

MODULE_DESCRIPTION("Mem to mem device framework for videobuf");
MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>");
MODULE_LICENSE("GPL");

static bool debug;
module_param(debug, bool, 0644);

#define dprintk(fmt, arg...)						\
	do {								\
		if (debug)						\
			printk(KERN_DEBUG "%s: " fmt, __func__, ## arg);\
	} while (0)


/* Instance is already queued on the job_queue */
#define TRANS_QUEUED		(1 << 0)
/* Instance is currently running in hardware */
#define TRANS_RUNNING		(1 << 1)
/* Instance is currently aborting */
#define TRANS_ABORT		(1 << 2)


/* Offset base for buffers on the destination queue - used to distinguish
 * between source and destination buffers when mmapping - they receive the same
 * offsets but for different queues */
#define DST_QUEUE_OFF_BASE	(1 << 30)

enum v4l2_m2m_entity_type {
	MEM2MEM_ENT_TYPE_SOURCE,
	MEM2MEM_ENT_TYPE_SINK,
	MEM2MEM_ENT_TYPE_PROC
};

static const char * const m2m_entity_name[] = {
	"source",
	"sink",
	"proc"
};

/**
 * struct v4l2_m2m_dev - per-device context
 * @source:		&struct media_entity pointer with the source entity
 *			Used only when the M2M device is registered via
 *			v4l2_m2m_unregister_media_controller().
 * @source_pad:		&struct media_pad with the source pad.
 *			Used only when the M2M device is registered via
 *			v4l2_m2m_unregister_media_controller().
 * @sink:		&struct media_entity pointer with the sink entity
 *			Used only when the M2M device is registered via
 *			v4l2_m2m_unregister_media_controller().
 * @sink_pad:		&struct media_pad with the sink pad.
 *			Used only when the M2M device is registered via
 *			v4l2_m2m_unregister_media_controller().
 * @proc:		&struct media_entity pointer with the M2M device itself.
 * @proc_pads:		&struct media_pad with the @proc pads.
 *			Used only when the M2M device is registered via
 *			v4l2_m2m_unregister_media_controller().
 * @intf_devnode:	&struct media_intf devnode pointer with the interface
 *			with controls the M2M device.
 * @curr_ctx:		currently running instance
 * @job_queue:		instances queued to run
 * @job_spinlock:	protects job_queue
 * @job_work:		worker to run queued jobs.
 * @m2m_ops:		driver callbacks
 */
struct v4l2_m2m_dev {
	struct v4l2_m2m_ctx	*curr_ctx;
#ifdef CONFIG_MEDIA_CONTROLLER
	struct media_entity	*source;
	struct media_pad	source_pad;
	struct media_entity	sink;
	struct media_pad	sink_pad;
	struct media_entity	proc;
	struct media_pad	proc_pads[2];
	struct media_intf_devnode *intf_devnode;
#endif

	struct list_head	job_queue;
	spinlock_t		job_spinlock;
	struct work_struct	job_work;

	const struct v4l2_m2m_ops *m2m_ops;
};

static struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx,
						enum v4l2_buf_type type)
{
	if (V4L2_TYPE_IS_OUTPUT(type))
		return &m2m_ctx->out_q_ctx;
	else
		return &m2m_ctx->cap_q_ctx;
}

struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
				       enum v4l2_buf_type type)
{
	struct v4l2_m2m_queue_ctx *q_ctx;

	q_ctx = get_queue_ctx(m2m_ctx, type);
	if (!q_ctx)
		return NULL;

	return &q_ctx->q;
}
EXPORT_SYMBOL(v4l2_m2m_get_vq);

struct vb2_v4l2_buffer *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx)
{
	struct v4l2_m2m_buffer *b;
	unsigned long flags;

	spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);

	if (list_empty(&q_ctx->rdy_queue)) {
		spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
		return NULL;
	}

	b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
	spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
	return &b->vb;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf);

struct vb2_v4l2_buffer *v4l2_m2m_last_buf(struct v4l2_m2m_queue_ctx *q_ctx)
{
	struct v4l2_m2m_buffer *b;
	unsigned long flags;

	spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);

	if (list_empty(&q_ctx->rdy_queue)) {
		spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
		return NULL;
	}

	b = list_last_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
	spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
	return &b->vb;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_last_buf);

struct vb2_v4l2_buffer *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx)
{
	struct v4l2_m2m_buffer *b;
	unsigned long flags;

	spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
	if (list_empty(&q_ctx->rdy_queue)) {
		spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
		return NULL;
	}
	b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
	list_del(&b->list);
	q_ctx->num_rdy--;
	spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);

	return &b->vb;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove);

void v4l2_m2m_buf_remove_by_buf(struct v4l2_m2m_queue_ctx *q_ctx,
				struct vb2_v4l2_buffer *vbuf)
{
	struct v4l2_m2m_buffer *b;
	unsigned long flags;

	spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
	b = container_of(vbuf, struct v4l2_m2m_buffer, vb);
	list_del(&b->list);
	q_ctx->num_rdy--;
	spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove_by_buf);

struct vb2_v4l2_buffer *
v4l2_m2m_buf_remove_by_idx(struct v4l2_m2m_queue_ctx *q_ctx, unsigned int idx)

{
	struct v4l2_m2m_buffer *b, *tmp;
	struct vb2_v4l2_buffer *ret = NULL;
	unsigned long flags;

	spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
	list_for_each_entry_safe(b, tmp, &q_ctx->rdy_queue, list) {
		if (b->vb.vb2_buf.index == idx) {
			list_del(&b->list);
			q_ctx->num_rdy--;
			ret = &b->vb;
			break;
		}
	}
	spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);

	return ret;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove_by_idx);

/*
 * Scheduling handlers
 */

void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev)
{
	unsigned long flags;
	void *ret = NULL;

	spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
	if (m2m_dev->curr_ctx)
		ret = m2m_dev->curr_ctx->priv;
	spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);

	return ret;
}
EXPORT_SYMBOL(v4l2_m2m_get_curr_priv);

/**
 * v4l2_m2m_try_run() - select next job to perform and run it if possible
 * @m2m_dev: per-device context
 *
 * Get next transaction (if present) from the waiting jobs list and run it.
 *
 * Note that this function can run on a given v4l2_m2m_ctx context,
 * but call .device_run for another context.
 */
static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev)
{
	unsigned long flags;

	spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
	if (NULL != m2m_dev->curr_ctx) {
		spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
		dprintk("Another instance is running, won't run now\n");
		return;
	}

	if (list_empty(&m2m_dev->job_queue)) {
		spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
		dprintk("No job pending\n");
		return;
	}

	m2m_dev->curr_ctx = list_first_entry(&m2m_dev->job_queue,
				   struct v4l2_m2m_ctx, queue);
	m2m_dev->curr_ctx->job_flags |= TRANS_RUNNING;
	spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);

	dprintk("Running job on m2m_ctx: %p\n", m2m_dev->curr_ctx);
	m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv);
}

/*
 * __v4l2_m2m_try_queue() - queue a job
 * @m2m_dev: m2m device
 * @m2m_ctx: m2m context
 *
 * Check if this context is ready to queue a job.
 *
 * This function can run in interrupt context.
 */
static void __v4l2_m2m_try_queue(struct v4l2_m2m_dev *m2m_dev,
				 struct v4l2_m2m_ctx *m2m_ctx)
{
	unsigned long flags_job, flags_out, flags_cap;

	dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx);

	if (!m2m_ctx->out_q_ctx.q.streaming
	    || !m2m_ctx->cap_q_ctx.q.streaming) {
		dprintk("Streaming needs to be on for both queues\n");
		return;
	}

	spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);

	/* If the context is aborted then don't schedule it */
	if (m2m_ctx->job_flags & TRANS_ABORT) {
		dprintk("Aborted context\n");
		goto job_unlock;
	}

	if (m2m_ctx->job_flags & TRANS_QUEUED) {
		dprintk("On job queue already\n");
		goto job_unlock;
	}

	spin_lock_irqsave(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out);
	if (list_empty(&m2m_ctx->out_q_ctx.rdy_queue)
	    && !m2m_ctx->out_q_ctx.buffered) {
		dprintk("No input buffers available\n");
		goto out_unlock;
	}
	spin_lock_irqsave(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap);
	if (list_empty(&m2m_ctx->cap_q_ctx.rdy_queue)
	    && !m2m_ctx->cap_q_ctx.buffered) {
		dprintk("No output buffers available\n");
		goto cap_unlock;
	}
	spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap);
	spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out);

	if (m2m_dev->m2m_ops->job_ready
		&& (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) {
		dprintk("Driver not ready\n");
		goto job_unlock;
	}

	list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue);
	m2m_ctx->job_flags |= TRANS_QUEUED;

	spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
	return;

cap_unlock:
	spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags_cap);
out_unlock:
	spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags_out);
job_unlock:
	spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
}

/**
 * v4l2_m2m_try_schedule() - schedule and possibly run a job for any context
 * @m2m_ctx: m2m context
 *
 * Check if this context is ready to queue a job. If suitable,
 * run the next queued job on the mem2mem device.
 *
 * This function shouldn't run in interrupt context.
 *
 * Note that v4l2_m2m_try_schedule() can schedule one job for this context,
 * and then run another job for another context.
 */
void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx)
{
	struct v4l2_m2m_dev *m2m_dev = m2m_ctx->m2m_dev;

	__v4l2_m2m_try_queue(m2m_dev, m2m_ctx);
	v4l2_m2m_try_run(m2m_dev);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_try_schedule);

/**
 * v4l2_m2m_device_run_work() - run pending jobs for the context
 * @work: Work structure used for scheduling the execution of this function.
 */
static void v4l2_m2m_device_run_work(struct work_struct *work)
{
	struct v4l2_m2m_dev *m2m_dev =
		container_of(work, struct v4l2_m2m_dev, job_work);

	v4l2_m2m_try_run(m2m_dev);
}

/**
 * v4l2_m2m_cancel_job() - cancel pending jobs for the context
 * @m2m_ctx: m2m context with jobs to be canceled
 *
 * In case of streamoff or release called on any context,
 * 1] If the context is currently running, then abort job will be called
 * 2] If the context is queued, then the context will be removed from
 *    the job_queue
 */
static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx *m2m_ctx)
{
	struct v4l2_m2m_dev *m2m_dev;
	unsigned long flags;

	m2m_dev = m2m_ctx->m2m_dev;
	spin_lock_irqsave(&m2m_dev->job_spinlock, flags);

	m2m_ctx->job_flags |= TRANS_ABORT;
	if (m2m_ctx->job_flags & TRANS_RUNNING) {
		spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
		if (m2m_dev->m2m_ops->job_abort)
			m2m_dev->m2m_ops->job_abort(m2m_ctx->priv);
		dprintk("m2m_ctx %p running, will wait to complete\n", m2m_ctx);
		wait_event(m2m_ctx->finished,
				!(m2m_ctx->job_flags & TRANS_RUNNING));
	} else if (m2m_ctx->job_flags & TRANS_QUEUED) {
		list_del(&m2m_ctx->queue);
		m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
		spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
		dprintk("m2m_ctx: %p had been on queue and was removed\n",
			m2m_ctx);
	} else {
		/* Do nothing, was not on queue/running */
		spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
	}
}

void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
			 struct v4l2_m2m_ctx *m2m_ctx)
{
	unsigned long flags;

	spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
	if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) {
		spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
		dprintk("Called by an instance not currently running\n");
		return;
	}

	list_del(&m2m_dev->curr_ctx->queue);
	m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
	wake_up(&m2m_dev->curr_ctx->finished);
	m2m_dev->curr_ctx = NULL;

	spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);

	/* This instance might have more buffers ready, but since we do not
	 * allow more than one job on the job_queue per instance, each has
	 * to be scheduled separately after the previous one finishes. */
	__v4l2_m2m_try_queue(m2m_dev, m2m_ctx);

	/* We might be running in atomic context,
	 * but the job must be run in non-atomic context.
	 */
	schedule_work(&m2m_dev->job_work);
}
EXPORT_SYMBOL(v4l2_m2m_job_finish);

int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
		     struct v4l2_requestbuffers *reqbufs)
{
	struct vb2_queue *vq;
	int ret;

	vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type);
	ret = vb2_reqbufs(vq, reqbufs);
	/* If count == 0, then the owner has released all buffers and he
	   is no longer owner of the queue. Otherwise we have an owner. */
	if (ret == 0)
		vq->owner = reqbufs->count ? file->private_data : NULL;

	return ret;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs);

int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
		      struct v4l2_buffer *buf)
{
	struct vb2_queue *vq;
	int ret = 0;
	unsigned int i;

	vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
	ret = vb2_querybuf(vq, buf);

	/* Adjust MMAP memory offsets for the CAPTURE queue */
	if (buf->memory == V4L2_MEMORY_MMAP && !V4L2_TYPE_IS_OUTPUT(vq->type)) {
		if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) {
			for (i = 0; i < buf->length; ++i)
				buf->m.planes[i].m.mem_offset
					+= DST_QUEUE_OFF_BASE;
		} else {
			buf->m.offset += DST_QUEUE_OFF_BASE;
		}
	}

	return ret;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf);

int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
		  struct v4l2_buffer *buf)
{
	struct video_device *vdev = video_devdata(file);
	struct vb2_queue *vq;
	int ret;

	vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
	if (!V4L2_TYPE_IS_OUTPUT(vq->type) &&
	    (buf->flags & V4L2_BUF_FLAG_REQUEST_FD)) {
		dprintk("%s: requests cannot be used with capture buffers\n",
			__func__);
		return -EPERM;
	}
	ret = vb2_qbuf(vq, vdev->v4l2_dev->mdev, buf);
	if (!ret && !(buf->flags & V4L2_BUF_FLAG_IN_REQUEST))
		v4l2_m2m_try_schedule(m2m_ctx);

	return ret;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf);

int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
		   struct v4l2_buffer *buf)
{
	struct vb2_queue *vq;

	vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
	return vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf);

int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
			 struct v4l2_buffer *buf)
{
	struct video_device *vdev = video_devdata(file);
	struct vb2_queue *vq;

	vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
	return vb2_prepare_buf(vq, vdev->v4l2_dev->mdev, buf);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_prepare_buf);

int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
			 struct v4l2_create_buffers *create)
{
	struct vb2_queue *vq;

	vq = v4l2_m2m_get_vq(m2m_ctx, create->format.type);
	return vb2_create_bufs(vq, create);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_create_bufs);

int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
		  struct v4l2_exportbuffer *eb)
{
	struct vb2_queue *vq;

	vq = v4l2_m2m_get_vq(m2m_ctx, eb->type);
	return vb2_expbuf(vq, eb);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_expbuf);

int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
		      enum v4l2_buf_type type)
{
	struct vb2_queue *vq;
	int ret;

	vq = v4l2_m2m_get_vq(m2m_ctx, type);
	ret = vb2_streamon(vq, type);
	if (!ret)
		v4l2_m2m_try_schedule(m2m_ctx);

	return ret;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_streamon);

int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
		       enum v4l2_buf_type type)
{
	struct v4l2_m2m_dev *m2m_dev;
	struct v4l2_m2m_queue_ctx *q_ctx;
	unsigned long flags_job, flags;
	int ret;

	/* wait until the current context is dequeued from job_queue */
	v4l2_m2m_cancel_job(m2m_ctx);

	q_ctx = get_queue_ctx(m2m_ctx, type);
	ret = vb2_streamoff(&q_ctx->q, type);
	if (ret)
		return ret;

	m2m_dev = m2m_ctx->m2m_dev;
	spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
	/* We should not be scheduled anymore, since we're dropping a queue. */
	if (m2m_ctx->job_flags & TRANS_QUEUED)
		list_del(&m2m_ctx->queue);
	m2m_ctx->job_flags = 0;

	spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
	/* Drop queue, since streamoff returns device to the same state as after
	 * calling reqbufs. */
	INIT_LIST_HEAD(&q_ctx->rdy_queue);
	q_ctx->num_rdy = 0;
	spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);

	if (m2m_dev->curr_ctx == m2m_ctx) {
		m2m_dev->curr_ctx = NULL;
		wake_up(&m2m_ctx->finished);
	}
	spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);

	return 0;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff);

__poll_t v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
			   struct poll_table_struct *wait)
{
	struct video_device *vfd = video_devdata(file);
	__poll_t req_events = poll_requested_events(wait);
	struct vb2_queue *src_q, *dst_q;
	struct vb2_buffer *src_vb = NULL, *dst_vb = NULL;
	__poll_t rc = 0;
	unsigned long flags;

	src_q = v4l2_m2m_get_src_vq(m2m_ctx);
	dst_q = v4l2_m2m_get_dst_vq(m2m_ctx);

	poll_wait(file, &src_q->done_wq, wait);
	poll_wait(file, &dst_q->done_wq, wait);

	if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
		struct v4l2_fh *fh = file->private_data;

		poll_wait(file, &fh->wait, wait);
		if (v4l2_event_pending(fh))
			rc = EPOLLPRI;
		if (!(req_events & (EPOLLOUT | EPOLLWRNORM | EPOLLIN | EPOLLRDNORM)))
			return rc;
	}

	/*
	 * There has to be at least one buffer queued on each queued_list, which
	 * means either in driver already or waiting for driver to claim it
	 * and start processing.
	 */
	if ((!src_q->streaming || src_q->error ||
	     list_empty(&src_q->queued_list)) &&
	    (!dst_q->streaming || dst_q->error ||
	     list_empty(&dst_q->queued_list))) {
		rc |= EPOLLERR;
		goto end;
	}

	spin_lock_irqsave(&dst_q->done_lock, flags);
	if (list_empty(&dst_q->done_list)) {
		/*
		 * If the last buffer was dequeued from the capture queue,
		 * return immediately. DQBUF will return -EPIPE.
		 */
		if (dst_q->last_buffer_dequeued) {
			spin_unlock_irqrestore(&dst_q->done_lock, flags);
			return rc | EPOLLIN | EPOLLRDNORM;
		}
	}
	spin_unlock_irqrestore(&dst_q->done_lock, flags);

	spin_lock_irqsave(&src_q->done_lock, flags);
	if (!list_empty(&src_q->done_list))
		src_vb = list_first_entry(&src_q->done_list, struct vb2_buffer,
						done_entry);
	if (src_vb && (src_vb->state == VB2_BUF_STATE_DONE
			|| src_vb->state == VB2_BUF_STATE_ERROR))
		rc |= EPOLLOUT | EPOLLWRNORM;
	spin_unlock_irqrestore(&src_q->done_lock, flags);

	spin_lock_irqsave(&dst_q->done_lock, flags);
	if (!list_empty(&dst_q->done_list))
		dst_vb = list_first_entry(&dst_q->done_list, struct vb2_buffer,
						done_entry);
	if (dst_vb && (dst_vb->state == VB2_BUF_STATE_DONE
			|| dst_vb->state == VB2_BUF_STATE_ERROR))
		rc |= EPOLLIN | EPOLLRDNORM;
	spin_unlock_irqrestore(&dst_q->done_lock, flags);

end:
	return rc;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_poll);

int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
			 struct vm_area_struct *vma)
{
	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
	struct vb2_queue *vq;

	if (offset < DST_QUEUE_OFF_BASE) {
		vq = v4l2_m2m_get_src_vq(m2m_ctx);
	} else {
		vq = v4l2_m2m_get_dst_vq(m2m_ctx);
		vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT);
	}

	return vb2_mmap(vq, vma);
}
EXPORT_SYMBOL(v4l2_m2m_mmap);

#if defined(CONFIG_MEDIA_CONTROLLER)
void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev)
{
	media_remove_intf_links(&m2m_dev->intf_devnode->intf);
	media_devnode_remove(m2m_dev->intf_devnode);

	media_entity_remove_links(m2m_dev->source);
	media_entity_remove_links(&m2m_dev->sink);
	media_entity_remove_links(&m2m_dev->proc);
	media_device_unregister_entity(m2m_dev->source);
	media_device_unregister_entity(&m2m_dev->sink);
	media_device_unregister_entity(&m2m_dev->proc);
	kfree(m2m_dev->source->name);
	kfree(m2m_dev->sink.name);
	kfree(m2m_dev->proc.name);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_unregister_media_controller);

static int v4l2_m2m_register_entity(struct media_device *mdev,
	struct v4l2_m2m_dev *m2m_dev, enum v4l2_m2m_entity_type type,
	struct video_device *vdev, int function)
{
	struct media_entity *entity;
	struct media_pad *pads;
	char *name;
	unsigned int len;
	int num_pads;
	int ret;

	switch (type) {
	case MEM2MEM_ENT_TYPE_SOURCE:
		entity = m2m_dev->source;
		pads = &m2m_dev->source_pad;
		pads[0].flags = MEDIA_PAD_FL_SOURCE;
		num_pads = 1;
		break;
	case MEM2MEM_ENT_TYPE_SINK:
		entity = &m2m_dev->sink;
		pads = &m2m_dev->sink_pad;
		pads[0].flags = MEDIA_PAD_FL_SINK;
		num_pads = 1;
		break;
	case MEM2MEM_ENT_TYPE_PROC:
		entity = &m2m_dev->proc;
		pads = m2m_dev->proc_pads;
		pads[0].flags = MEDIA_PAD_FL_SINK;
		pads[1].flags = MEDIA_PAD_FL_SOURCE;
		num_pads = 2;
		break;
	default:
		return -EINVAL;
	}

	entity->obj_type = MEDIA_ENTITY_TYPE_BASE;
	if (type != MEM2MEM_ENT_TYPE_PROC) {
		entity->info.dev.major = VIDEO_MAJOR;
		entity->info.dev.minor = vdev->minor;
	}
	len = strlen(vdev->name) + 2 + strlen(m2m_entity_name[type]);
	name = kmalloc(len, GFP_KERNEL);
	if (!name)
		return -ENOMEM;
	snprintf(name, len, "%s-%s", vdev->name, m2m_entity_name[type]);
	entity->name = name;
	entity->function = function;

	ret = media_entity_pads_init(entity, num_pads, pads);
	if (ret)
		return ret;
	ret = media_device_register_entity(mdev, entity);
	if (ret)
		return ret;

	return 0;
}

int v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
		struct video_device *vdev, int function)
{
	struct media_device *mdev = vdev->v4l2_dev->mdev;
	struct media_link *link;
	int ret;

	if (!mdev)
		return 0;

	/* A memory-to-memory device consists in two
	 * DMA engine and one video processing entities.
	 * The DMA engine entities are linked to a V4L interface
	 */

	/* Create the three entities with their pads */
	m2m_dev->source = &vdev->entity;
	ret = v4l2_m2m_register_entity(mdev, m2m_dev,
			MEM2MEM_ENT_TYPE_SOURCE, vdev, MEDIA_ENT_F_IO_V4L);
	if (ret)
		return ret;
	ret = v4l2_m2m_register_entity(mdev, m2m_dev,
			MEM2MEM_ENT_TYPE_PROC, vdev, function);
	if (ret)
		goto err_rel_entity0;
	ret = v4l2_m2m_register_entity(mdev, m2m_dev,
			MEM2MEM_ENT_TYPE_SINK, vdev, MEDIA_ENT_F_IO_V4L);
	if (ret)
		goto err_rel_entity1;

	/* Connect the three entities */
	ret = media_create_pad_link(m2m_dev->source, 0, &m2m_dev->proc, 1,
			MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
	if (ret)
		goto err_rel_entity2;

	ret = media_create_pad_link(&m2m_dev->proc, 0, &m2m_dev->sink, 0,
			MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
	if (ret)
		goto err_rm_links0;

	/* Create video interface */
	m2m_dev->intf_devnode = media_devnode_create(mdev,
			MEDIA_INTF_T_V4L_VIDEO, 0,
			VIDEO_MAJOR, vdev->minor);
	if (!m2m_dev->intf_devnode) {
		ret = -ENOMEM;
		goto err_rm_links1;
	}

	/* Connect the two DMA engines to the interface */
	link = media_create_intf_link(m2m_dev->source,
			&m2m_dev->intf_devnode->intf,
			MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
	if (!link) {
		ret = -ENOMEM;
		goto err_rm_devnode;
	}

	link = media_create_intf_link(&m2m_dev->sink,
			&m2m_dev->intf_devnode->intf,
			MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
	if (!link) {
		ret = -ENOMEM;
		goto err_rm_intf_link;
	}
	return 0;

err_rm_intf_link:
	media_remove_intf_links(&m2m_dev->intf_devnode->intf);
err_rm_devnode:
	media_devnode_remove(m2m_dev->intf_devnode);
err_rm_links1:
	media_entity_remove_links(&m2m_dev->sink);
err_rm_links0:
	media_entity_remove_links(&m2m_dev->proc);
	media_entity_remove_links(m2m_dev->source);
err_rel_entity2:
	media_device_unregister_entity(&m2m_dev->proc);
	kfree(m2m_dev->proc.name);
err_rel_entity1:
	media_device_unregister_entity(&m2m_dev->sink);
	kfree(m2m_dev->sink.name);
err_rel_entity0:
	media_device_unregister_entity(m2m_dev->source);
	kfree(m2m_dev->source->name);
	return ret;
	return 0;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_register_media_controller);
#endif

struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops)
{
	struct v4l2_m2m_dev *m2m_dev;

	if (!m2m_ops || WARN_ON(!m2m_ops->device_run))
		return ERR_PTR(-EINVAL);

	m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL);
	if (!m2m_dev)
		return ERR_PTR(-ENOMEM);

	m2m_dev->curr_ctx = NULL;
	m2m_dev->m2m_ops = m2m_ops;
	INIT_LIST_HEAD(&m2m_dev->job_queue);
	spin_lock_init(&m2m_dev->job_spinlock);
	INIT_WORK(&m2m_dev->job_work, v4l2_m2m_device_run_work);

	return m2m_dev;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_init);

void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev)
{
	kfree(m2m_dev);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_release);

struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
		void *drv_priv,
		int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq))
{
	struct v4l2_m2m_ctx *m2m_ctx;
	struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx;
	int ret;

	m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL);
	if (!m2m_ctx)
		return ERR_PTR(-ENOMEM);

	m2m_ctx->priv = drv_priv;
	m2m_ctx->m2m_dev = m2m_dev;
	init_waitqueue_head(&m2m_ctx->finished);

	out_q_ctx = &m2m_ctx->out_q_ctx;
	cap_q_ctx = &m2m_ctx->cap_q_ctx;

	INIT_LIST_HEAD(&out_q_ctx->rdy_queue);
	INIT_LIST_HEAD(&cap_q_ctx->rdy_queue);
	spin_lock_init(&out_q_ctx->rdy_spinlock);
	spin_lock_init(&cap_q_ctx->rdy_spinlock);

	INIT_LIST_HEAD(&m2m_ctx->queue);

	ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q);

	if (ret)
		goto err;
	/*
	 * Both queues should use same the mutex to lock the m2m context.
	 * This lock is used in some v4l2_m2m_* helpers.
	 */
	if (WARN_ON(out_q_ctx->q.lock != cap_q_ctx->q.lock)) {
		ret = -EINVAL;
		goto err;
	}
	m2m_ctx->q_lock = out_q_ctx->q.lock;

	return m2m_ctx;
err:
	kfree(m2m_ctx);
	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init);

void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx)
{
	/* wait until the current context is dequeued from job_queue */
	v4l2_m2m_cancel_job(m2m_ctx);

	vb2_queue_release(&m2m_ctx->cap_q_ctx.q);
	vb2_queue_release(&m2m_ctx->out_q_ctx.q);

	kfree(m2m_ctx);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release);

void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
		struct vb2_v4l2_buffer *vbuf)
{
	struct v4l2_m2m_buffer *b = container_of(vbuf,
				struct v4l2_m2m_buffer, vb);
	struct v4l2_m2m_queue_ctx *q_ctx;
	unsigned long flags;

	q_ctx = get_queue_ctx(m2m_ctx, vbuf->vb2_buf.vb2_queue->type);
	if (!q_ctx)
		return;

	spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
	list_add_tail(&b->list, &q_ctx->rdy_queue);
	q_ctx->num_rdy++;
	spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue);

void v4l2_m2m_buf_copy_metadata(const struct vb2_v4l2_buffer *out_vb,
				struct vb2_v4l2_buffer *cap_vb,
				bool copy_frame_flags)
{
	u32 mask = V4L2_BUF_FLAG_TIMECODE | V4L2_BUF_FLAG_TSTAMP_SRC_MASK;

	if (copy_frame_flags)
		mask |= V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_PFRAME |
			V4L2_BUF_FLAG_BFRAME;

	cap_vb->vb2_buf.timestamp = out_vb->vb2_buf.timestamp;

	if (out_vb->flags & V4L2_BUF_FLAG_TIMECODE)
		cap_vb->timecode = out_vb->timecode;
	cap_vb->field = out_vb->field;
	cap_vb->flags &= ~mask;
	cap_vb->flags |= out_vb->flags & mask;
	cap_vb->vb2_buf.copied_timestamp = 1;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_buf_copy_metadata);

void v4l2_m2m_request_queue(struct media_request *req)
{
	struct media_request_object *obj, *obj_safe;
	struct v4l2_m2m_ctx *m2m_ctx = NULL;

	/*
	 * Queue all objects. Note that buffer objects are at the end of the
	 * objects list, after all other object types. Once buffer objects
	 * are queued, the driver might delete them immediately (if the driver
	 * processes the buffer at once), so we have to use
	 * list_for_each_entry_safe() to handle the case where the object we
	 * queue is deleted.
	 */
	list_for_each_entry_safe(obj, obj_safe, &req->objects, list) {
		struct v4l2_m2m_ctx *m2m_ctx_obj;
		struct vb2_buffer *vb;

		if (!obj->ops->queue)
			continue;

		if (vb2_request_object_is_buffer(obj)) {
			/* Sanity checks */
			vb = container_of(obj, struct vb2_buffer, req_obj);
			WARN_ON(!V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type));
			m2m_ctx_obj = container_of(vb->vb2_queue,
						   struct v4l2_m2m_ctx,
						   out_q_ctx.q);
			WARN_ON(m2m_ctx && m2m_ctx_obj != m2m_ctx);
			m2m_ctx = m2m_ctx_obj;
		}

		/*
		 * The buffer we queue here can in theory be immediately
		 * unbound, hence the use of list_for_each_entry_safe()
		 * above and why we call the queue op last.
		 */
		obj->ops->queue(obj);
	}

	WARN_ON(!m2m_ctx);

	if (m2m_ctx)
		v4l2_m2m_try_schedule(m2m_ctx);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_request_queue);

/* Videobuf2 ioctl helpers */

int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
				struct v4l2_requestbuffers *rb)
{
	struct v4l2_fh *fh = file->private_data;

	return v4l2_m2m_reqbufs(file, fh->m2m_ctx, rb);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_reqbufs);

int v4l2_m2m_ioctl_create_bufs(struct file *file, void *priv,
				struct v4l2_create_buffers *create)
{
	struct v4l2_fh *fh = file->private_data;

	return v4l2_m2m_create_bufs(file, fh->m2m_ctx, create);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_create_bufs);

int v4l2_m2m_ioctl_querybuf(struct file *file, void *priv,
				struct v4l2_buffer *buf)
{
	struct v4l2_fh *fh = file->private_data;

	return v4l2_m2m_querybuf(file, fh->m2m_ctx, buf);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_querybuf);

int v4l2_m2m_ioctl_qbuf(struct file *file, void *priv,
				struct v4l2_buffer *buf)
{
	struct v4l2_fh *fh = file->private_data;

	return v4l2_m2m_qbuf(file, fh->m2m_ctx, buf);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_qbuf);

int v4l2_m2m_ioctl_dqbuf(struct file *file, void *priv,
				struct v4l2_buffer *buf)
{
	struct v4l2_fh *fh = file->private_data;

	return v4l2_m2m_dqbuf(file, fh->m2m_ctx, buf);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_dqbuf);

int v4l2_m2m_ioctl_prepare_buf(struct file *file, void *priv,
			       struct v4l2_buffer *buf)
{
	struct v4l2_fh *fh = file->private_data;

	return v4l2_m2m_prepare_buf(file, fh->m2m_ctx, buf);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_prepare_buf);

int v4l2_m2m_ioctl_expbuf(struct file *file, void *priv,
				struct v4l2_exportbuffer *eb)
{
	struct v4l2_fh *fh = file->private_data;

	return v4l2_m2m_expbuf(file, fh->m2m_ctx, eb);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_expbuf);

int v4l2_m2m_ioctl_streamon(struct file *file, void *priv,
				enum v4l2_buf_type type)
{
	struct v4l2_fh *fh = file->private_data;

	return v4l2_m2m_streamon(file, fh->m2m_ctx, type);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamon);

int v4l2_m2m_ioctl_streamoff(struct file *file, void *priv,
				enum v4l2_buf_type type)
{
	struct v4l2_fh *fh = file->private_data;

	return v4l2_m2m_streamoff(file, fh->m2m_ctx, type);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamoff);

/*
 * v4l2_file_operations helpers. It is assumed here same lock is used
 * for the output and the capture buffer queue.
 */

int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct v4l2_fh *fh = file->private_data;

	return v4l2_m2m_mmap(file, fh->m2m_ctx, vma);
}
EXPORT_SYMBOL_GPL(v4l2_m2m_fop_mmap);

__poll_t v4l2_m2m_fop_poll(struct file *file, poll_table *wait)
{
	struct v4l2_fh *fh = file->private_data;
	struct v4l2_m2m_ctx *m2m_ctx = fh->m2m_ctx;
	__poll_t ret;

	if (m2m_ctx->q_lock)
		mutex_lock(m2m_ctx->q_lock);

	ret = v4l2_m2m_poll(file, m2m_ctx, wait);

	if (m2m_ctx->q_lock)
		mutex_unlock(m2m_ctx->q_lock);

	return ret;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_fop_poll);