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17#include <linux/device.h>
18#include <linux/err.h>
19#include <linux/freezer.h>
20#include <linux/kernel.h>
21#include <linux/kthread.h>
22#include <linux/mm.h>
23#include <linux/module.h>
24#include <linux/poll.h>
25#include <linux/sched.h>
26#include <linux/slab.h>
27
28#include <media/v4l2-common.h>
29#include <media/v4l2-dev.h>
30#include <media/v4l2-device.h>
31#include <media/v4l2-event.h>
32#include <media/v4l2-fh.h>
33
34#include <media/videobuf2-v4l2.h>
35
36static int debug;
37module_param(debug, int, 0644);
38
39#define dprintk(q, level, fmt, arg...) \
40 do { \
41 if (debug >= level) \
42 pr_info("vb2-v4l2: [%p] %s: " fmt, \
43 (q)->name, __func__, ## arg); \
44 } while (0)
45
46
47#define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \
48 V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \
49 V4L2_BUF_FLAG_PREPARED | \
50 V4L2_BUF_FLAG_IN_REQUEST | \
51 V4L2_BUF_FLAG_REQUEST_FD | \
52 V4L2_BUF_FLAG_TIMESTAMP_MASK)
53
54#define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | \
55 V4L2_BUF_FLAG_BFRAME | \
56 V4L2_BUF_FLAG_KEYFRAME | \
57 V4L2_BUF_FLAG_TIMECODE | \
58 V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF)
59
60
61
62
63
64static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b)
65{
66 if (!V4L2_TYPE_IS_MULTIPLANAR(b->type))
67 return 0;
68
69
70 if (b->m.planes == NULL) {
71 dprintk(vb->vb2_queue, 1,
72 "multi-planar buffer passed but planes array not provided\n");
73 return -EINVAL;
74 }
75
76 if (b->length < vb->num_planes || b->length > VB2_MAX_PLANES) {
77 dprintk(vb->vb2_queue, 1,
78 "incorrect planes array length, expected %d, got %d\n",
79 vb->num_planes, b->length);
80 return -EINVAL;
81 }
82
83 return 0;
84}
85
86static int __verify_planes_array_core(struct vb2_buffer *vb, const void *pb)
87{
88 return __verify_planes_array(vb, pb);
89}
90
91
92
93
94
95static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b)
96{
97 unsigned int length;
98 unsigned int bytesused;
99 unsigned int plane;
100
101 if (V4L2_TYPE_IS_CAPTURE(b->type))
102 return 0;
103
104 if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
105 for (plane = 0; plane < vb->num_planes; ++plane) {
106 length = (b->memory == VB2_MEMORY_USERPTR ||
107 b->memory == VB2_MEMORY_DMABUF)
108 ? b->m.planes[plane].length
109 : vb->planes[plane].length;
110 bytesused = b->m.planes[plane].bytesused
111 ? b->m.planes[plane].bytesused : length;
112
113 if (b->m.planes[plane].bytesused > length)
114 return -EINVAL;
115
116 if (b->m.planes[plane].data_offset > 0 &&
117 b->m.planes[plane].data_offset >= bytesused)
118 return -EINVAL;
119 }
120 } else {
121 length = (b->memory == VB2_MEMORY_USERPTR ||
122 b->memory == VB2_MEMORY_DMABUF)
123 ? b->length : vb->planes[0].length;
124
125 if (b->bytesused > length)
126 return -EINVAL;
127 }
128
129 return 0;
130}
131
132
133
134
135static void __init_vb2_v4l2_buffer(struct vb2_buffer *vb)
136{
137 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
138
139 vbuf->request_fd = -1;
140}
141
142static void __copy_timestamp(struct vb2_buffer *vb, const void *pb)
143{
144 const struct v4l2_buffer *b = pb;
145 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
146 struct vb2_queue *q = vb->vb2_queue;
147
148 if (q->is_output) {
149
150
151
152
153 if (q->copy_timestamp)
154 vb->timestamp = v4l2_buffer_get_timestamp(b);
155 vbuf->flags |= b->flags & V4L2_BUF_FLAG_TIMECODE;
156 if (b->flags & V4L2_BUF_FLAG_TIMECODE)
157 vbuf->timecode = b->timecode;
158 }
159};
160
161static void vb2_warn_zero_bytesused(struct vb2_buffer *vb)
162{
163 static bool check_once;
164
165 if (check_once)
166 return;
167
168 check_once = true;
169
170 pr_warn("use of bytesused == 0 is deprecated and will be removed in the future,\n");
171 if (vb->vb2_queue->allow_zero_bytesused)
172 pr_warn("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n");
173 else
174 pr_warn("use the actual size instead.\n");
175}
176
177static int vb2_fill_vb2_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b)
178{
179 struct vb2_queue *q = vb->vb2_queue;
180 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
181 struct vb2_plane *planes = vbuf->planes;
182 unsigned int plane;
183 int ret;
184
185 ret = __verify_length(vb, b);
186 if (ret < 0) {
187 dprintk(q, 1, "plane parameters verification failed: %d\n", ret);
188 return ret;
189 }
190 if (b->field == V4L2_FIELD_ALTERNATE && q->is_output) {
191
192
193
194
195
196
197
198
199
200 dprintk(q, 1, "the field is incorrectly set to ALTERNATE for an output buffer\n");
201 return -EINVAL;
202 }
203 vbuf->sequence = 0;
204 vbuf->request_fd = -1;
205 vbuf->is_held = false;
206
207 if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
208 switch (b->memory) {
209 case VB2_MEMORY_USERPTR:
210 for (plane = 0; plane < vb->num_planes; ++plane) {
211 planes[plane].m.userptr =
212 b->m.planes[plane].m.userptr;
213 planes[plane].length =
214 b->m.planes[plane].length;
215 }
216 break;
217 case VB2_MEMORY_DMABUF:
218 for (plane = 0; plane < vb->num_planes; ++plane) {
219 planes[plane].m.fd =
220 b->m.planes[plane].m.fd;
221 planes[plane].length =
222 b->m.planes[plane].length;
223 }
224 break;
225 default:
226 for (plane = 0; plane < vb->num_planes; ++plane) {
227 planes[plane].m.offset =
228 vb->planes[plane].m.offset;
229 planes[plane].length =
230 vb->planes[plane].length;
231 }
232 break;
233 }
234
235
236 if (V4L2_TYPE_IS_OUTPUT(b->type)) {
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253 for (plane = 0; plane < vb->num_planes; ++plane) {
254 struct vb2_plane *pdst = &planes[plane];
255 struct v4l2_plane *psrc = &b->m.planes[plane];
256
257 if (psrc->bytesused == 0)
258 vb2_warn_zero_bytesused(vb);
259
260 if (vb->vb2_queue->allow_zero_bytesused)
261 pdst->bytesused = psrc->bytesused;
262 else
263 pdst->bytesused = psrc->bytesused ?
264 psrc->bytesused : pdst->length;
265 pdst->data_offset = psrc->data_offset;
266 }
267 }
268 } else {
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283 switch (b->memory) {
284 case VB2_MEMORY_USERPTR:
285 planes[0].m.userptr = b->m.userptr;
286 planes[0].length = b->length;
287 break;
288 case VB2_MEMORY_DMABUF:
289 planes[0].m.fd = b->m.fd;
290 planes[0].length = b->length;
291 break;
292 default:
293 planes[0].m.offset = vb->planes[0].m.offset;
294 planes[0].length = vb->planes[0].length;
295 break;
296 }
297
298 planes[0].data_offset = 0;
299 if (V4L2_TYPE_IS_OUTPUT(b->type)) {
300 if (b->bytesused == 0)
301 vb2_warn_zero_bytesused(vb);
302
303 if (vb->vb2_queue->allow_zero_bytesused)
304 planes[0].bytesused = b->bytesused;
305 else
306 planes[0].bytesused = b->bytesused ?
307 b->bytesused : planes[0].length;
308 } else
309 planes[0].bytesused = 0;
310
311 }
312
313
314 vbuf->flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS;
315 if (!vb->vb2_queue->copy_timestamp || V4L2_TYPE_IS_CAPTURE(b->type)) {
316
317
318
319
320
321 vbuf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
322 }
323
324 if (V4L2_TYPE_IS_OUTPUT(b->type)) {
325
326
327
328
329
330
331 vbuf->flags &= ~V4L2_BUF_FLAG_TIMECODE;
332 vbuf->field = b->field;
333 if (!(q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF))
334 vbuf->flags &= ~V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
335 } else {
336
337 vbuf->flags &= ~V4L2_BUFFER_OUT_FLAGS;
338
339 vbuf->flags &= ~V4L2_BUF_FLAG_LAST;
340 }
341
342 return 0;
343}
344
345static void set_buffer_cache_hints(struct vb2_queue *q,
346 struct vb2_buffer *vb,
347 struct v4l2_buffer *b)
348{
349
350
351
352
353
354 if (q->memory == VB2_MEMORY_DMABUF) {
355 vb->need_cache_sync_on_finish = 0;
356 vb->need_cache_sync_on_prepare = 0;
357 return;
358 }
359
360
361
362
363
364 vb->need_cache_sync_on_prepare = 1;
365 vb->need_cache_sync_on_finish = 1;
366
367 if (!vb2_queue_allows_cache_hints(q)) {
368
369
370
371
372
373 b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_INVALIDATE;
374 b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_CLEAN;
375 return;
376 }
377
378
379
380
381
382 if (q->dma_dir == DMA_TO_DEVICE)
383 vb->need_cache_sync_on_finish = 0;
384
385 if (b->flags & V4L2_BUF_FLAG_NO_CACHE_INVALIDATE)
386 vb->need_cache_sync_on_finish = 0;
387
388 if (b->flags & V4L2_BUF_FLAG_NO_CACHE_CLEAN)
389 vb->need_cache_sync_on_prepare = 0;
390}
391
392static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *mdev,
393 struct v4l2_buffer *b, bool is_prepare,
394 struct media_request **p_req)
395{
396 const char *opname = is_prepare ? "prepare_buf" : "qbuf";
397 struct media_request *req;
398 struct vb2_v4l2_buffer *vbuf;
399 struct vb2_buffer *vb;
400 int ret;
401
402 if (b->type != q->type) {
403 dprintk(q, 1, "%s: invalid buffer type\n", opname);
404 return -EINVAL;
405 }
406
407 if (b->index >= q->num_buffers) {
408 dprintk(q, 1, "%s: buffer index out of range\n", opname);
409 return -EINVAL;
410 }
411
412 if (q->bufs[b->index] == NULL) {
413
414 dprintk(q, 1, "%s: buffer is NULL\n", opname);
415 return -EINVAL;
416 }
417
418 if (b->memory != q->memory) {
419 dprintk(q, 1, "%s: invalid memory type\n", opname);
420 return -EINVAL;
421 }
422
423 vb = q->bufs[b->index];
424 vbuf = to_vb2_v4l2_buffer(vb);
425 ret = __verify_planes_array(vb, b);
426 if (ret)
427 return ret;
428
429 if (!is_prepare && (b->flags & V4L2_BUF_FLAG_REQUEST_FD) &&
430 vb->state != VB2_BUF_STATE_DEQUEUED) {
431 dprintk(q, 1, "%s: buffer is not in dequeued state\n", opname);
432 return -EINVAL;
433 }
434
435 if (!vb->prepared) {
436 set_buffer_cache_hints(q, vb, b);
437
438 memset(vbuf->planes, 0,
439 sizeof(vbuf->planes[0]) * vb->num_planes);
440 ret = vb2_fill_vb2_v4l2_buffer(vb, b);
441 if (ret)
442 return ret;
443 }
444
445 if (is_prepare)
446 return 0;
447
448 if (!(b->flags & V4L2_BUF_FLAG_REQUEST_FD)) {
449 if (q->requires_requests) {
450 dprintk(q, 1, "%s: queue requires requests\n", opname);
451 return -EBADR;
452 }
453 if (q->uses_requests) {
454 dprintk(q, 1, "%s: queue uses requests\n", opname);
455 return -EBUSY;
456 }
457 return 0;
458 } else if (!q->supports_requests) {
459 dprintk(q, 1, "%s: queue does not support requests\n", opname);
460 return -EBADR;
461 } else if (q->uses_qbuf) {
462 dprintk(q, 1, "%s: queue does not use requests\n", opname);
463 return -EBUSY;
464 }
465
466
467
468
469
470
471 if (WARN_ON(!q->lock || !p_req))
472 return -EINVAL;
473
474
475
476
477
478
479 if (WARN_ON(!q->ops->buf_request_complete))
480 return -EINVAL;
481
482
483
484
485
486 if (WARN_ON((q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT ||
487 q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) &&
488 !q->ops->buf_out_validate))
489 return -EINVAL;
490
491 if (b->request_fd < 0) {
492 dprintk(q, 1, "%s: request_fd < 0\n", opname);
493 return -EINVAL;
494 }
495
496 req = media_request_get_by_fd(mdev, b->request_fd);
497 if (IS_ERR(req)) {
498 dprintk(q, 1, "%s: invalid request_fd\n", opname);
499 return PTR_ERR(req);
500 }
501
502
503
504
505
506 if (req->state != MEDIA_REQUEST_STATE_IDLE &&
507 req->state != MEDIA_REQUEST_STATE_UPDATING) {
508 dprintk(q, 1, "%s: request is not idle\n", opname);
509 media_request_put(req);
510 return -EBUSY;
511 }
512
513 *p_req = req;
514 vbuf->request_fd = b->request_fd;
515
516 return 0;
517}
518
519
520
521
522
523static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
524{
525 struct v4l2_buffer *b = pb;
526 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
527 struct vb2_queue *q = vb->vb2_queue;
528 unsigned int plane;
529
530
531 b->index = vb->index;
532 b->type = vb->type;
533 b->memory = vb->memory;
534 b->bytesused = 0;
535
536 b->flags = vbuf->flags;
537 b->field = vbuf->field;
538 v4l2_buffer_set_timestamp(b, vb->timestamp);
539 b->timecode = vbuf->timecode;
540 b->sequence = vbuf->sequence;
541 b->reserved2 = 0;
542 b->request_fd = 0;
543
544 if (q->is_multiplanar) {
545
546
547
548
549 b->length = vb->num_planes;
550 for (plane = 0; plane < vb->num_planes; ++plane) {
551 struct v4l2_plane *pdst = &b->m.planes[plane];
552 struct vb2_plane *psrc = &vb->planes[plane];
553
554 pdst->bytesused = psrc->bytesused;
555 pdst->length = psrc->length;
556 if (q->memory == VB2_MEMORY_MMAP)
557 pdst->m.mem_offset = psrc->m.offset;
558 else if (q->memory == VB2_MEMORY_USERPTR)
559 pdst->m.userptr = psrc->m.userptr;
560 else if (q->memory == VB2_MEMORY_DMABUF)
561 pdst->m.fd = psrc->m.fd;
562 pdst->data_offset = psrc->data_offset;
563 memset(pdst->reserved, 0, sizeof(pdst->reserved));
564 }
565 } else {
566
567
568
569
570 b->length = vb->planes[0].length;
571 b->bytesused = vb->planes[0].bytesused;
572 if (q->memory == VB2_MEMORY_MMAP)
573 b->m.offset = vb->planes[0].m.offset;
574 else if (q->memory == VB2_MEMORY_USERPTR)
575 b->m.userptr = vb->planes[0].m.userptr;
576 else if (q->memory == VB2_MEMORY_DMABUF)
577 b->m.fd = vb->planes[0].m.fd;
578 }
579
580
581
582
583 b->flags &= ~V4L2_BUFFER_MASK_FLAGS;
584 b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK;
585 if (!q->copy_timestamp) {
586
587
588
589
590 b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
591 b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
592 }
593
594 switch (vb->state) {
595 case VB2_BUF_STATE_QUEUED:
596 case VB2_BUF_STATE_ACTIVE:
597 b->flags |= V4L2_BUF_FLAG_QUEUED;
598 break;
599 case VB2_BUF_STATE_IN_REQUEST:
600 b->flags |= V4L2_BUF_FLAG_IN_REQUEST;
601 break;
602 case VB2_BUF_STATE_ERROR:
603 b->flags |= V4L2_BUF_FLAG_ERROR;
604 fallthrough;
605 case VB2_BUF_STATE_DONE:
606 b->flags |= V4L2_BUF_FLAG_DONE;
607 break;
608 case VB2_BUF_STATE_PREPARING:
609 case VB2_BUF_STATE_DEQUEUED:
610
611 break;
612 }
613
614 if ((vb->state == VB2_BUF_STATE_DEQUEUED ||
615 vb->state == VB2_BUF_STATE_IN_REQUEST) &&
616 vb->synced && vb->prepared)
617 b->flags |= V4L2_BUF_FLAG_PREPARED;
618
619 if (vb2_buffer_in_use(q, vb))
620 b->flags |= V4L2_BUF_FLAG_MAPPED;
621 if (vbuf->request_fd >= 0) {
622 b->flags |= V4L2_BUF_FLAG_REQUEST_FD;
623 b->request_fd = vbuf->request_fd;
624 }
625}
626
627
628
629
630
631
632static int __fill_vb2_buffer(struct vb2_buffer *vb, struct vb2_plane *planes)
633{
634 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
635 unsigned int plane;
636
637 if (!vb->vb2_queue->copy_timestamp)
638 vb->timestamp = 0;
639
640 for (plane = 0; plane < vb->num_planes; ++plane) {
641 if (vb->vb2_queue->memory != VB2_MEMORY_MMAP) {
642 planes[plane].m = vbuf->planes[plane].m;
643 planes[plane].length = vbuf->planes[plane].length;
644 }
645 planes[plane].bytesused = vbuf->planes[plane].bytesused;
646 planes[plane].data_offset = vbuf->planes[plane].data_offset;
647 }
648 return 0;
649}
650
651static const struct vb2_buf_ops v4l2_buf_ops = {
652 .verify_planes_array = __verify_planes_array_core,
653 .init_buffer = __init_vb2_v4l2_buffer,
654 .fill_user_buffer = __fill_v4l2_buffer,
655 .fill_vb2_buffer = __fill_vb2_buffer,
656 .copy_timestamp = __copy_timestamp,
657};
658
659int vb2_find_timestamp(const struct vb2_queue *q, u64 timestamp,
660 unsigned int start_idx)
661{
662 unsigned int i;
663
664 for (i = start_idx; i < q->num_buffers; i++)
665 if (q->bufs[i]->copied_timestamp &&
666 q->bufs[i]->timestamp == timestamp)
667 return i;
668 return -1;
669}
670EXPORT_SYMBOL_GPL(vb2_find_timestamp);
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b)
686{
687 struct vb2_buffer *vb;
688 int ret;
689
690 if (b->type != q->type) {
691 dprintk(q, 1, "wrong buffer type\n");
692 return -EINVAL;
693 }
694
695 if (b->index >= q->num_buffers) {
696 dprintk(q, 1, "buffer index out of range\n");
697 return -EINVAL;
698 }
699 vb = q->bufs[b->index];
700 ret = __verify_planes_array(vb, b);
701 if (!ret)
702 vb2_core_querybuf(q, b->index, b);
703 return ret;
704}
705EXPORT_SYMBOL(vb2_querybuf);
706
707static void fill_buf_caps(struct vb2_queue *q, u32 *caps)
708{
709 *caps = V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS;
710 if (q->io_modes & VB2_MMAP)
711 *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP;
712 if (q->io_modes & VB2_USERPTR)
713 *caps |= V4L2_BUF_CAP_SUPPORTS_USERPTR;
714 if (q->io_modes & VB2_DMABUF)
715 *caps |= V4L2_BUF_CAP_SUPPORTS_DMABUF;
716 if (q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF)
717 *caps |= V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF;
718 if (q->allow_cache_hints && q->io_modes & VB2_MMAP)
719 *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS;
720#ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API
721 if (q->supports_requests)
722 *caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS;
723#endif
724}
725
726int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
727{
728 int ret = vb2_verify_memory_type(q, req->memory, req->type);
729
730 fill_buf_caps(q, &req->capabilities);
731 return ret ? ret : vb2_core_reqbufs(q, req->memory, &req->count);
732}
733EXPORT_SYMBOL_GPL(vb2_reqbufs);
734
735int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev,
736 struct v4l2_buffer *b)
737{
738 int ret;
739
740 if (vb2_fileio_is_active(q)) {
741 dprintk(q, 1, "file io in progress\n");
742 return -EBUSY;
743 }
744
745 if (b->flags & V4L2_BUF_FLAG_REQUEST_FD)
746 return -EINVAL;
747
748 ret = vb2_queue_or_prepare_buf(q, mdev, b, true, NULL);
749
750 return ret ? ret : vb2_core_prepare_buf(q, b->index, b);
751}
752EXPORT_SYMBOL_GPL(vb2_prepare_buf);
753
754int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
755{
756 unsigned requested_planes = 1;
757 unsigned requested_sizes[VIDEO_MAX_PLANES];
758 struct v4l2_format *f = &create->format;
759 int ret = vb2_verify_memory_type(q, create->memory, f->type);
760 unsigned i;
761
762 fill_buf_caps(q, &create->capabilities);
763 create->index = q->num_buffers;
764 if (create->count == 0)
765 return ret != -EBUSY ? ret : 0;
766
767 switch (f->type) {
768 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
769 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
770 requested_planes = f->fmt.pix_mp.num_planes;
771 if (requested_planes == 0 ||
772 requested_planes > VIDEO_MAX_PLANES)
773 return -EINVAL;
774 for (i = 0; i < requested_planes; i++)
775 requested_sizes[i] =
776 f->fmt.pix_mp.plane_fmt[i].sizeimage;
777 break;
778 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
779 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
780 requested_sizes[0] = f->fmt.pix.sizeimage;
781 break;
782 case V4L2_BUF_TYPE_VBI_CAPTURE:
783 case V4L2_BUF_TYPE_VBI_OUTPUT:
784 requested_sizes[0] = f->fmt.vbi.samples_per_line *
785 (f->fmt.vbi.count[0] + f->fmt.vbi.count[1]);
786 break;
787 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
788 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
789 requested_sizes[0] = f->fmt.sliced.io_size;
790 break;
791 case V4L2_BUF_TYPE_SDR_CAPTURE:
792 case V4L2_BUF_TYPE_SDR_OUTPUT:
793 requested_sizes[0] = f->fmt.sdr.buffersize;
794 break;
795 case V4L2_BUF_TYPE_META_CAPTURE:
796 case V4L2_BUF_TYPE_META_OUTPUT:
797 requested_sizes[0] = f->fmt.meta.buffersize;
798 break;
799 default:
800 return -EINVAL;
801 }
802 for (i = 0; i < requested_planes; i++)
803 if (requested_sizes[i] == 0)
804 return -EINVAL;
805 return ret ? ret : vb2_core_create_bufs(q, create->memory,
806 &create->count,
807 requested_planes,
808 requested_sizes);
809}
810EXPORT_SYMBOL_GPL(vb2_create_bufs);
811
812int vb2_qbuf(struct vb2_queue *q, struct media_device *mdev,
813 struct v4l2_buffer *b)
814{
815 struct media_request *req = NULL;
816 int ret;
817
818 if (vb2_fileio_is_active(q)) {
819 dprintk(q, 1, "file io in progress\n");
820 return -EBUSY;
821 }
822
823 ret = vb2_queue_or_prepare_buf(q, mdev, b, false, &req);
824 if (ret)
825 return ret;
826 ret = vb2_core_qbuf(q, b->index, b, req);
827 if (req)
828 media_request_put(req);
829 return ret;
830}
831EXPORT_SYMBOL_GPL(vb2_qbuf);
832
833int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking)
834{
835 int ret;
836
837 if (vb2_fileio_is_active(q)) {
838 dprintk(q, 1, "file io in progress\n");
839 return -EBUSY;
840 }
841
842 if (b->type != q->type) {
843 dprintk(q, 1, "invalid buffer type\n");
844 return -EINVAL;
845 }
846
847 ret = vb2_core_dqbuf(q, NULL, b, nonblocking);
848
849 if (!q->is_output &&
850 b->flags & V4L2_BUF_FLAG_DONE &&
851 b->flags & V4L2_BUF_FLAG_LAST)
852 q->last_buffer_dequeued = true;
853
854
855
856
857
858 b->flags &= ~V4L2_BUF_FLAG_DONE;
859
860 return ret;
861}
862EXPORT_SYMBOL_GPL(vb2_dqbuf);
863
864int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
865{
866 if (vb2_fileio_is_active(q)) {
867 dprintk(q, 1, "file io in progress\n");
868 return -EBUSY;
869 }
870 return vb2_core_streamon(q, type);
871}
872EXPORT_SYMBOL_GPL(vb2_streamon);
873
874int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type)
875{
876 if (vb2_fileio_is_active(q)) {
877 dprintk(q, 1, "file io in progress\n");
878 return -EBUSY;
879 }
880 return vb2_core_streamoff(q, type);
881}
882EXPORT_SYMBOL_GPL(vb2_streamoff);
883
884int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb)
885{
886 return vb2_core_expbuf(q, &eb->fd, eb->type, eb->index,
887 eb->plane, eb->flags);
888}
889EXPORT_SYMBOL_GPL(vb2_expbuf);
890
891int vb2_queue_init_name(struct vb2_queue *q, const char *name)
892{
893
894
895
896 if (WARN_ON(!q) ||
897 WARN_ON(q->timestamp_flags &
898 ~(V4L2_BUF_FLAG_TIMESTAMP_MASK |
899 V4L2_BUF_FLAG_TSTAMP_SRC_MASK)))
900 return -EINVAL;
901
902
903 WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) ==
904 V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN);
905
906
907 if (WARN_ON(VB2_MEMORY_MMAP != (int)V4L2_MEMORY_MMAP)
908 || WARN_ON(VB2_MEMORY_USERPTR != (int)V4L2_MEMORY_USERPTR)
909 || WARN_ON(VB2_MEMORY_DMABUF != (int)V4L2_MEMORY_DMABUF))
910 return -EINVAL;
911
912 if (q->buf_struct_size == 0)
913 q->buf_struct_size = sizeof(struct vb2_v4l2_buffer);
914
915 q->buf_ops = &v4l2_buf_ops;
916 q->is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type);
917 q->is_output = V4L2_TYPE_IS_OUTPUT(q->type);
918 q->copy_timestamp = (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK)
919 == V4L2_BUF_FLAG_TIMESTAMP_COPY;
920
921
922
923
924
925 q->quirk_poll_must_check_waiting_for_buffers = true;
926
927 if (name)
928 strscpy(q->name, name, sizeof(q->name));
929 else
930 q->name[0] = '\0';
931
932 return vb2_core_queue_init(q);
933}
934EXPORT_SYMBOL_GPL(vb2_queue_init_name);
935
936int vb2_queue_init(struct vb2_queue *q)
937{
938 return vb2_queue_init_name(q, NULL);
939}
940EXPORT_SYMBOL_GPL(vb2_queue_init);
941
942void vb2_queue_release(struct vb2_queue *q)
943{
944 vb2_core_queue_release(q);
945}
946EXPORT_SYMBOL_GPL(vb2_queue_release);
947
948__poll_t vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
949{
950 struct video_device *vfd = video_devdata(file);
951 __poll_t res;
952
953 res = vb2_core_poll(q, file, wait);
954
955 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
956 struct v4l2_fh *fh = file->private_data;
957
958 poll_wait(file, &fh->wait, wait);
959 if (v4l2_event_pending(fh))
960 res |= EPOLLPRI;
961 }
962
963 return res;
964}
965EXPORT_SYMBOL_GPL(vb2_poll);
966
967
968
969
970
971
972
973
974
975
976static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file)
977{
978 return vdev->queue->owner && vdev->queue->owner != file->private_data;
979}
980
981
982
983int vb2_ioctl_reqbufs(struct file *file, void *priv,
984 struct v4l2_requestbuffers *p)
985{
986 struct video_device *vdev = video_devdata(file);
987 int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type);
988
989 fill_buf_caps(vdev->queue, &p->capabilities);
990 if (res)
991 return res;
992 if (vb2_queue_is_busy(vdev, file))
993 return -EBUSY;
994 res = vb2_core_reqbufs(vdev->queue, p->memory, &p->count);
995
996
997 if (res == 0)
998 vdev->queue->owner = p->count ? file->private_data : NULL;
999 return res;
1000}
1001EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs);
1002
1003int vb2_ioctl_create_bufs(struct file *file, void *priv,
1004 struct v4l2_create_buffers *p)
1005{
1006 struct video_device *vdev = video_devdata(file);
1007 int res = vb2_verify_memory_type(vdev->queue, p->memory,
1008 p->format.type);
1009
1010 p->index = vdev->queue->num_buffers;
1011 fill_buf_caps(vdev->queue, &p->capabilities);
1012
1013
1014
1015
1016 if (p->count == 0)
1017 return res != -EBUSY ? res : 0;
1018 if (res)
1019 return res;
1020 if (vb2_queue_is_busy(vdev, file))
1021 return -EBUSY;
1022
1023 res = vb2_create_bufs(vdev->queue, p);
1024 if (res == 0)
1025 vdev->queue->owner = file->private_data;
1026 return res;
1027}
1028EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs);
1029
1030int vb2_ioctl_prepare_buf(struct file *file, void *priv,
1031 struct v4l2_buffer *p)
1032{
1033 struct video_device *vdev = video_devdata(file);
1034
1035 if (vb2_queue_is_busy(vdev, file))
1036 return -EBUSY;
1037 return vb2_prepare_buf(vdev->queue, vdev->v4l2_dev->mdev, p);
1038}
1039EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf);
1040
1041int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)
1042{
1043 struct video_device *vdev = video_devdata(file);
1044
1045
1046 return vb2_querybuf(vdev->queue, p);
1047}
1048EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf);
1049
1050int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
1051{
1052 struct video_device *vdev = video_devdata(file);
1053
1054 if (vb2_queue_is_busy(vdev, file))
1055 return -EBUSY;
1056 return vb2_qbuf(vdev->queue, vdev->v4l2_dev->mdev, p);
1057}
1058EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf);
1059
1060int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
1061{
1062 struct video_device *vdev = video_devdata(file);
1063
1064 if (vb2_queue_is_busy(vdev, file))
1065 return -EBUSY;
1066 return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK);
1067}
1068EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf);
1069
1070int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
1071{
1072 struct video_device *vdev = video_devdata(file);
1073
1074 if (vb2_queue_is_busy(vdev, file))
1075 return -EBUSY;
1076 return vb2_streamon(vdev->queue, i);
1077}
1078EXPORT_SYMBOL_GPL(vb2_ioctl_streamon);
1079
1080int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
1081{
1082 struct video_device *vdev = video_devdata(file);
1083
1084 if (vb2_queue_is_busy(vdev, file))
1085 return -EBUSY;
1086 return vb2_streamoff(vdev->queue, i);
1087}
1088EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff);
1089
1090int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p)
1091{
1092 struct video_device *vdev = video_devdata(file);
1093
1094 if (vb2_queue_is_busy(vdev, file))
1095 return -EBUSY;
1096 return vb2_expbuf(vdev->queue, p);
1097}
1098EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf);
1099
1100
1101
1102int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma)
1103{
1104 struct video_device *vdev = video_devdata(file);
1105
1106 return vb2_mmap(vdev->queue, vma);
1107}
1108EXPORT_SYMBOL_GPL(vb2_fop_mmap);
1109
1110int _vb2_fop_release(struct file *file, struct mutex *lock)
1111{
1112 struct video_device *vdev = video_devdata(file);
1113
1114 if (lock)
1115 mutex_lock(lock);
1116 if (file->private_data == vdev->queue->owner) {
1117 vb2_queue_release(vdev->queue);
1118 vdev->queue->owner = NULL;
1119 }
1120 if (lock)
1121 mutex_unlock(lock);
1122 return v4l2_fh_release(file);
1123}
1124EXPORT_SYMBOL_GPL(_vb2_fop_release);
1125
1126int vb2_fop_release(struct file *file)
1127{
1128 struct video_device *vdev = video_devdata(file);
1129 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
1130
1131 return _vb2_fop_release(file, lock);
1132}
1133EXPORT_SYMBOL_GPL(vb2_fop_release);
1134
1135ssize_t vb2_fop_write(struct file *file, const char __user *buf,
1136 size_t count, loff_t *ppos)
1137{
1138 struct video_device *vdev = video_devdata(file);
1139 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
1140 int err = -EBUSY;
1141
1142 if (!(vdev->queue->io_modes & VB2_WRITE))
1143 return -EINVAL;
1144 if (lock && mutex_lock_interruptible(lock))
1145 return -ERESTARTSYS;
1146 if (vb2_queue_is_busy(vdev, file))
1147 goto exit;
1148 err = vb2_write(vdev->queue, buf, count, ppos,
1149 file->f_flags & O_NONBLOCK);
1150 if (vdev->queue->fileio)
1151 vdev->queue->owner = file->private_data;
1152exit:
1153 if (lock)
1154 mutex_unlock(lock);
1155 return err;
1156}
1157EXPORT_SYMBOL_GPL(vb2_fop_write);
1158
1159ssize_t vb2_fop_read(struct file *file, char __user *buf,
1160 size_t count, loff_t *ppos)
1161{
1162 struct video_device *vdev = video_devdata(file);
1163 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
1164 int err = -EBUSY;
1165
1166 if (!(vdev->queue->io_modes & VB2_READ))
1167 return -EINVAL;
1168 if (lock && mutex_lock_interruptible(lock))
1169 return -ERESTARTSYS;
1170 if (vb2_queue_is_busy(vdev, file))
1171 goto exit;
1172 err = vb2_read(vdev->queue, buf, count, ppos,
1173 file->f_flags & O_NONBLOCK);
1174 if (vdev->queue->fileio)
1175 vdev->queue->owner = file->private_data;
1176exit:
1177 if (lock)
1178 mutex_unlock(lock);
1179 return err;
1180}
1181EXPORT_SYMBOL_GPL(vb2_fop_read);
1182
1183__poll_t vb2_fop_poll(struct file *file, poll_table *wait)
1184{
1185 struct video_device *vdev = video_devdata(file);
1186 struct vb2_queue *q = vdev->queue;
1187 struct mutex *lock = q->lock ? q->lock : vdev->lock;
1188 __poll_t res;
1189 void *fileio;
1190
1191
1192
1193
1194
1195 WARN_ON(!lock);
1196
1197 if (lock && mutex_lock_interruptible(lock))
1198 return EPOLLERR;
1199
1200 fileio = q->fileio;
1201
1202 res = vb2_poll(vdev->queue, file, wait);
1203
1204
1205 if (!fileio && q->fileio)
1206 q->owner = file->private_data;
1207 if (lock)
1208 mutex_unlock(lock);
1209 return res;
1210}
1211EXPORT_SYMBOL_GPL(vb2_fop_poll);
1212
1213#ifndef CONFIG_MMU
1214unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr,
1215 unsigned long len, unsigned long pgoff, unsigned long flags)
1216{
1217 struct video_device *vdev = video_devdata(file);
1218
1219 return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags);
1220}
1221EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area);
1222#endif
1223
1224void vb2_video_unregister_device(struct video_device *vdev)
1225{
1226
1227 if (!vdev || !video_is_registered(vdev))
1228 return;
1229
1230
1231
1232
1233
1234 WARN_ON(!vdev->queue);
1235
1236
1237
1238
1239
1240
1241 get_device(&vdev->dev);
1242 video_unregister_device(vdev);
1243 if (vdev->queue && vdev->queue->owner) {
1244 struct mutex *lock = vdev->queue->lock ?
1245 vdev->queue->lock : vdev->lock;
1246
1247 if (lock)
1248 mutex_lock(lock);
1249 vb2_queue_release(vdev->queue);
1250 vdev->queue->owner = NULL;
1251 if (lock)
1252 mutex_unlock(lock);
1253 }
1254
1255
1256
1257
1258 put_device(&vdev->dev);
1259}
1260EXPORT_SYMBOL_GPL(vb2_video_unregister_device);
1261
1262
1263
1264void vb2_ops_wait_prepare(struct vb2_queue *vq)
1265{
1266 mutex_unlock(vq->lock);
1267}
1268EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare);
1269
1270void vb2_ops_wait_finish(struct vb2_queue *vq)
1271{
1272 mutex_lock(vq->lock);
1273}
1274EXPORT_SYMBOL_GPL(vb2_ops_wait_finish);
1275
1276
1277
1278
1279
1280
1281
1282int vb2_request_validate(struct media_request *req)
1283{
1284 struct media_request_object *obj;
1285 int ret = 0;
1286
1287 if (!vb2_request_buffer_cnt(req))
1288 return -ENOENT;
1289
1290 list_for_each_entry(obj, &req->objects, list) {
1291 if (!obj->ops->prepare)
1292 continue;
1293
1294 ret = obj->ops->prepare(obj);
1295 if (ret)
1296 break;
1297 }
1298
1299 if (ret) {
1300 list_for_each_entry_continue_reverse(obj, &req->objects, list)
1301 if (obj->ops->unprepare)
1302 obj->ops->unprepare(obj);
1303 return ret;
1304 }
1305 return 0;
1306}
1307EXPORT_SYMBOL_GPL(vb2_request_validate);
1308
1309void vb2_request_queue(struct media_request *req)
1310{
1311 struct media_request_object *obj, *obj_safe;
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321 list_for_each_entry_safe(obj, obj_safe, &req->objects, list)
1322 if (obj->ops->queue)
1323 obj->ops->queue(obj);
1324}
1325EXPORT_SYMBOL_GPL(vb2_request_queue);
1326
1327MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2");
1328MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski");
1329MODULE_LICENSE("GPL");
1330