1373 lines · c
1/*2 * videobuf2-v4l2.c - V4L2 driver helper framework3 *4 * Copyright (C) 2010 Samsung Electronics5 *6 * Author: Pawel Osciak <pawel@osciak.com>7 * Marek Szyprowski <m.szyprowski@samsung.com>8 *9 * The vb2_thread implementation was based on code from videobuf-dvb.c:10 * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]11 *12 * This program is free software; you can redistribute it and/or modify13 * it under the terms of the GNU General Public License as published by14 * the Free Software Foundation.15 */16 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/* Flags that are set by us */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/* Output buffer flags that should be passed on to the driver */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 * __verify_planes_array() - verify that the planes array passed in struct62 * v4l2_buffer from userspace can be safely used63 */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 /* Is memory for copying plane information present? */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 * __verify_length() - Verify that the bytesused value for each plane fits in93 * the plane length and that the data offset doesn't exceed the bytesused value.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].length109 : vb->planes[plane].length;110 bytesused = b->m.planes[plane].bytesused111 ? 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->length : vb->planes[0].length;123 124 if (b->bytesused > length)125 return -EINVAL;126 }127 128 return 0;129}130 131/*132 * __init_vb2_v4l2_buffer() - initialize the vb2_v4l2_buffer struct133 */134static void __init_vb2_v4l2_buffer(struct vb2_buffer *vb)135{136 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);137 138 vbuf->request_fd = -1;139}140 141static void __copy_timestamp(struct vb2_buffer *vb, const void *pb)142{143 const struct v4l2_buffer *b = pb;144 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);145 struct vb2_queue *q = vb->vb2_queue;146 147 if (q->is_output) {148 /*149 * For output buffers copy the timestamp if needed,150 * and the timecode field and flag if needed.151 */152 if (q->copy_timestamp)153 vb->timestamp = v4l2_buffer_get_timestamp(b);154 vbuf->flags |= b->flags & V4L2_BUF_FLAG_TIMECODE;155 if (b->flags & V4L2_BUF_FLAG_TIMECODE)156 vbuf->timecode = b->timecode;157 }158};159 160static void vb2_warn_zero_bytesused(struct vb2_buffer *vb)161{162 static bool check_once;163 164 if (check_once)165 return;166 167 check_once = true;168 169 pr_warn("use of bytesused == 0 is deprecated and will be removed in the future,\n");170 if (vb->vb2_queue->allow_zero_bytesused)171 pr_warn("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n");172 else173 pr_warn("use the actual size instead.\n");174}175 176static int vb2_fill_vb2_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b)177{178 struct vb2_queue *q = vb->vb2_queue;179 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);180 struct vb2_plane *planes = vbuf->planes;181 unsigned int plane;182 int ret;183 184 ret = __verify_length(vb, b);185 if (ret < 0) {186 dprintk(q, 1, "plane parameters verification failed: %d\n", ret);187 return ret;188 }189 if (b->field == V4L2_FIELD_ALTERNATE && q->is_output) {190 /*191 * If the format's field is ALTERNATE, then the buffer's field192 * should be either TOP or BOTTOM, not ALTERNATE since that193 * makes no sense. The driver has to know whether the194 * buffer represents a top or a bottom field in order to195 * program any DMA correctly. Using ALTERNATE is wrong, since196 * that just says that it is either a top or a bottom field,197 * but not which of the two it is.198 */199 dprintk(q, 1, "the field is incorrectly set to ALTERNATE for an output buffer\n");200 return -EINVAL;201 }202 vbuf->sequence = 0;203 vbuf->request_fd = -1;204 vbuf->is_held = false;205 206 if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {207 switch (b->memory) {208 case VB2_MEMORY_USERPTR:209 for (plane = 0; plane < vb->num_planes; ++plane) {210 planes[plane].m.userptr =211 b->m.planes[plane].m.userptr;212 planes[plane].length =213 b->m.planes[plane].length;214 }215 break;216 case VB2_MEMORY_DMABUF:217 for (plane = 0; plane < vb->num_planes; ++plane) {218 planes[plane].m.fd =219 b->m.planes[plane].m.fd;220 planes[plane].length =221 b->m.planes[plane].length;222 }223 break;224 default:225 for (plane = 0; plane < vb->num_planes; ++plane) {226 planes[plane].m.offset =227 vb->planes[plane].m.offset;228 planes[plane].length =229 vb->planes[plane].length;230 }231 break;232 }233 234 /* Fill in driver-provided information for OUTPUT types */235 if (V4L2_TYPE_IS_OUTPUT(b->type)) {236 /*237 * Will have to go up to b->length when API starts238 * accepting variable number of planes.239 *240 * If bytesused == 0 for the output buffer, then fall241 * back to the full buffer size. In that case242 * userspace clearly never bothered to set it and243 * it's a safe assumption that they really meant to244 * use the full plane sizes.245 *246 * Some drivers, e.g. old codec drivers, use bytesused == 0247 * as a way to indicate that streaming is finished.248 * In that case, the driver should use the249 * allow_zero_bytesused flag to keep old userspace250 * applications working.251 */252 for (plane = 0; plane < vb->num_planes; ++plane) {253 struct vb2_plane *pdst = &planes[plane];254 struct v4l2_plane *psrc = &b->m.planes[plane];255 256 if (psrc->bytesused == 0)257 vb2_warn_zero_bytesused(vb);258 259 if (vb->vb2_queue->allow_zero_bytesused)260 pdst->bytesused = psrc->bytesused;261 else262 pdst->bytesused = psrc->bytesused ?263 psrc->bytesused : pdst->length;264 pdst->data_offset = psrc->data_offset;265 }266 }267 } else {268 /*269 * Single-planar buffers do not use planes array,270 * so fill in relevant v4l2_buffer struct fields instead.271 * In vb2 we use our internal V4l2_planes struct for272 * single-planar buffers as well, for simplicity.273 *274 * If bytesused == 0 for the output buffer, then fall back275 * to the full buffer size as that's a sensible default.276 *277 * Some drivers, e.g. old codec drivers, use bytesused == 0 as278 * a way to indicate that streaming is finished. In that case,279 * the driver should use the allow_zero_bytesused flag to keep280 * old userspace applications working.281 */282 switch (b->memory) {283 case VB2_MEMORY_USERPTR:284 planes[0].m.userptr = b->m.userptr;285 planes[0].length = b->length;286 break;287 case VB2_MEMORY_DMABUF:288 planes[0].m.fd = b->m.fd;289 planes[0].length = b->length;290 break;291 default:292 planes[0].m.offset = vb->planes[0].m.offset;293 planes[0].length = vb->planes[0].length;294 break;295 }296 297 planes[0].data_offset = 0;298 if (V4L2_TYPE_IS_OUTPUT(b->type)) {299 if (b->bytesused == 0)300 vb2_warn_zero_bytesused(vb);301 302 if (vb->vb2_queue->allow_zero_bytesused)303 planes[0].bytesused = b->bytesused;304 else305 planes[0].bytesused = b->bytesused ?306 b->bytesused : planes[0].length;307 } else308 planes[0].bytesused = 0;309 310 }311 312 /* Zero flags that we handle */313 vbuf->flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS;314 if (!vb->vb2_queue->copy_timestamp || V4L2_TYPE_IS_CAPTURE(b->type)) {315 /*316 * Non-COPY timestamps and non-OUTPUT queues will get317 * their timestamp and timestamp source flags from the318 * queue.319 */320 vbuf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;321 }322 323 if (V4L2_TYPE_IS_OUTPUT(b->type)) {324 /*325 * For output buffers mask out the timecode flag:326 * this will be handled later in vb2_qbuf().327 * The 'field' is valid metadata for this output buffer328 * and so that needs to be copied here.329 */330 vbuf->flags &= ~V4L2_BUF_FLAG_TIMECODE;331 vbuf->field = b->field;332 if (!(q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF))333 vbuf->flags &= ~V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;334 } else {335 /* Zero any output buffer flags as this is a capture buffer */336 vbuf->flags &= ~V4L2_BUFFER_OUT_FLAGS;337 /* Zero last flag, this is a signal from driver to userspace */338 vbuf->flags &= ~V4L2_BUF_FLAG_LAST;339 }340 341 return 0;342}343 344static void set_buffer_cache_hints(struct vb2_queue *q,345 struct vb2_buffer *vb,346 struct v4l2_buffer *b)347{348 if (!vb2_queue_allows_cache_hints(q)) {349 /*350 * Clear buffer cache flags if queue does not support user351 * space hints. That's to indicate to userspace that these352 * flags won't work.353 */354 b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_INVALIDATE;355 b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_CLEAN;356 return;357 }358 359 if (b->flags & V4L2_BUF_FLAG_NO_CACHE_INVALIDATE)360 vb->skip_cache_sync_on_finish = 1;361 362 if (b->flags & V4L2_BUF_FLAG_NO_CACHE_CLEAN)363 vb->skip_cache_sync_on_prepare = 1;364}365 366static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *mdev,367 struct vb2_buffer *vb, struct v4l2_buffer *b,368 bool is_prepare, struct media_request **p_req)369{370 const char *opname = is_prepare ? "prepare_buf" : "qbuf";371 struct media_request *req;372 struct vb2_v4l2_buffer *vbuf;373 int ret;374 375 if (b->type != q->type) {376 dprintk(q, 1, "%s: invalid buffer type\n", opname);377 return -EINVAL;378 }379 380 if (b->memory != q->memory) {381 dprintk(q, 1, "%s: invalid memory type\n", opname);382 return -EINVAL;383 }384 385 vbuf = to_vb2_v4l2_buffer(vb);386 ret = __verify_planes_array(vb, b);387 if (ret)388 return ret;389 390 if (!is_prepare && (b->flags & V4L2_BUF_FLAG_REQUEST_FD) &&391 vb->state != VB2_BUF_STATE_DEQUEUED) {392 dprintk(q, 1, "%s: buffer is not in dequeued state\n", opname);393 return -EINVAL;394 }395 396 if (!vb->prepared) {397 set_buffer_cache_hints(q, vb, b);398 /* Copy relevant information provided by the userspace */399 memset(vbuf->planes, 0,400 sizeof(vbuf->planes[0]) * vb->num_planes);401 ret = vb2_fill_vb2_v4l2_buffer(vb, b);402 if (ret)403 return ret;404 }405 406 if (is_prepare)407 return 0;408 409 if (!(b->flags & V4L2_BUF_FLAG_REQUEST_FD)) {410 if (q->requires_requests) {411 dprintk(q, 1, "%s: queue requires requests\n", opname);412 return -EBADR;413 }414 if (q->uses_requests) {415 dprintk(q, 1, "%s: queue uses requests\n", opname);416 return -EBUSY;417 }418 return 0;419 } else if (!q->supports_requests) {420 dprintk(q, 1, "%s: queue does not support requests\n", opname);421 return -EBADR;422 } else if (q->uses_qbuf) {423 dprintk(q, 1, "%s: queue does not use requests\n", opname);424 return -EBUSY;425 }426 427 /*428 * For proper locking when queueing a request you need to be able429 * to lock access to the vb2 queue, so check that there is a lock430 * that we can use. In addition p_req must be non-NULL.431 */432 if (WARN_ON(!q->lock || !p_req))433 return -EINVAL;434 435 /*436 * Make sure this op is implemented by the driver. It's easy to forget437 * this callback, but is it important when canceling a buffer in a438 * queued request.439 */440 if (WARN_ON(!q->ops->buf_request_complete))441 return -EINVAL;442 /*443 * Make sure this op is implemented by the driver for the output queue.444 * It's easy to forget this callback, but is it important to correctly445 * validate the 'field' value at QBUF time.446 */447 if (WARN_ON((q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT ||448 q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) &&449 !q->ops->buf_out_validate))450 return -EINVAL;451 452 req = media_request_get_by_fd(mdev, b->request_fd);453 if (IS_ERR(req)) {454 dprintk(q, 1, "%s: invalid request_fd\n", opname);455 return PTR_ERR(req);456 }457 458 /*459 * Early sanity check. This is checked again when the buffer460 * is bound to the request in vb2_core_qbuf().461 */462 if (req->state != MEDIA_REQUEST_STATE_IDLE &&463 req->state != MEDIA_REQUEST_STATE_UPDATING) {464 dprintk(q, 1, "%s: request is not idle\n", opname);465 media_request_put(req);466 return -EBUSY;467 }468 469 *p_req = req;470 vbuf->request_fd = b->request_fd;471 472 return 0;473}474 475/*476 * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be477 * returned to userspace478 */479static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)480{481 struct v4l2_buffer *b = pb;482 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);483 struct vb2_queue *q = vb->vb2_queue;484 unsigned int plane;485 486 /* Copy back data such as timestamp, flags, etc. */487 b->index = vb->index;488 b->type = vb->type;489 b->memory = vb->memory;490 b->bytesused = 0;491 492 b->flags = vbuf->flags;493 b->field = vbuf->field;494 v4l2_buffer_set_timestamp(b, vb->timestamp);495 b->timecode = vbuf->timecode;496 b->sequence = vbuf->sequence;497 b->reserved2 = 0;498 b->request_fd = 0;499 500 if (q->is_multiplanar) {501 /*502 * Fill in plane-related data if userspace provided an array503 * for it. The caller has already verified memory and size.504 */505 b->length = vb->num_planes;506 for (plane = 0; plane < vb->num_planes; ++plane) {507 struct v4l2_plane *pdst = &b->m.planes[plane];508 struct vb2_plane *psrc = &vb->planes[plane];509 510 pdst->bytesused = psrc->bytesused;511 pdst->length = psrc->length;512 if (q->memory == VB2_MEMORY_MMAP)513 pdst->m.mem_offset = psrc->m.offset;514 else if (q->memory == VB2_MEMORY_USERPTR)515 pdst->m.userptr = psrc->m.userptr;516 else if (q->memory == VB2_MEMORY_DMABUF)517 pdst->m.fd = psrc->m.fd;518 pdst->data_offset = psrc->data_offset;519 memset(pdst->reserved, 0, sizeof(pdst->reserved));520 }521 } else {522 /*523 * We use length and offset in v4l2_planes array even for524 * single-planar buffers, but userspace does not.525 */526 b->length = vb->planes[0].length;527 b->bytesused = vb->planes[0].bytesused;528 if (q->memory == VB2_MEMORY_MMAP)529 b->m.offset = vb->planes[0].m.offset;530 else if (q->memory == VB2_MEMORY_USERPTR)531 b->m.userptr = vb->planes[0].m.userptr;532 else if (q->memory == VB2_MEMORY_DMABUF)533 b->m.fd = vb->planes[0].m.fd;534 }535 536 /*537 * Clear any buffer state related flags.538 */539 b->flags &= ~V4L2_BUFFER_MASK_FLAGS;540 b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK;541 if (!q->copy_timestamp) {542 /*543 * For non-COPY timestamps, drop timestamp source bits544 * and obtain the timestamp source from the queue.545 */546 b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;547 b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;548 }549 550 switch (vb->state) {551 case VB2_BUF_STATE_QUEUED:552 case VB2_BUF_STATE_ACTIVE:553 b->flags |= V4L2_BUF_FLAG_QUEUED;554 break;555 case VB2_BUF_STATE_IN_REQUEST:556 b->flags |= V4L2_BUF_FLAG_IN_REQUEST;557 break;558 case VB2_BUF_STATE_ERROR:559 b->flags |= V4L2_BUF_FLAG_ERROR;560 fallthrough;561 case VB2_BUF_STATE_DONE:562 b->flags |= V4L2_BUF_FLAG_DONE;563 break;564 case VB2_BUF_STATE_PREPARING:565 case VB2_BUF_STATE_DEQUEUED:566 /* nothing */567 break;568 }569 570 if ((vb->state == VB2_BUF_STATE_DEQUEUED ||571 vb->state == VB2_BUF_STATE_IN_REQUEST) &&572 vb->synced && vb->prepared)573 b->flags |= V4L2_BUF_FLAG_PREPARED;574 575 if (vb2_buffer_in_use(q, vb))576 b->flags |= V4L2_BUF_FLAG_MAPPED;577 if (vbuf->request_fd >= 0) {578 b->flags |= V4L2_BUF_FLAG_REQUEST_FD;579 b->request_fd = vbuf->request_fd;580 }581}582 583/*584 * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a585 * v4l2_buffer by the userspace. It also verifies that struct586 * v4l2_buffer has a valid number of planes.587 */588static int __fill_vb2_buffer(struct vb2_buffer *vb, struct vb2_plane *planes)589{590 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);591 unsigned int plane;592 593 if (!vb->vb2_queue->copy_timestamp)594 vb->timestamp = 0;595 596 for (plane = 0; plane < vb->num_planes; ++plane) {597 if (vb->vb2_queue->memory != VB2_MEMORY_MMAP) {598 planes[plane].m = vbuf->planes[plane].m;599 planes[plane].length = vbuf->planes[plane].length;600 }601 planes[plane].bytesused = vbuf->planes[plane].bytesused;602 planes[plane].data_offset = vbuf->planes[plane].data_offset;603 }604 return 0;605}606 607static const struct vb2_buf_ops v4l2_buf_ops = {608 .verify_planes_array = __verify_planes_array_core,609 .init_buffer = __init_vb2_v4l2_buffer,610 .fill_user_buffer = __fill_v4l2_buffer,611 .fill_vb2_buffer = __fill_vb2_buffer,612 .copy_timestamp = __copy_timestamp,613};614 615struct vb2_buffer *vb2_find_buffer(struct vb2_queue *q, u64 timestamp)616{617 unsigned int i;618 struct vb2_buffer *vb2;619 620 /*621 * This loop doesn't scale if there is a really large number of buffers.622 * Maybe something more efficient will be needed in this case.623 */624 for (i = 0; i < q->max_num_buffers; i++) {625 vb2 = vb2_get_buffer(q, i);626 627 if (!vb2)628 continue;629 630 if (vb2->copied_timestamp &&631 vb2->timestamp == timestamp)632 return vb2;633 }634 return NULL;635}636EXPORT_SYMBOL_GPL(vb2_find_buffer);637 638/*639 * vb2_querybuf() - query video buffer information640 * @q: vb2 queue641 * @b: buffer struct passed from userspace to vidioc_querybuf handler642 * in driver643 *644 * Should be called from vidioc_querybuf ioctl handler in driver.645 * This function will verify the passed v4l2_buffer structure and fill the646 * relevant information for the userspace.647 *648 * The return values from this function are intended to be directly returned649 * from vidioc_querybuf handler in driver.650 */651int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b)652{653 struct vb2_buffer *vb;654 int ret;655 656 if (b->type != q->type) {657 dprintk(q, 1, "wrong buffer type\n");658 return -EINVAL;659 }660 661 vb = vb2_get_buffer(q, b->index);662 if (!vb) {663 dprintk(q, 1, "can't find the requested buffer %u\n", b->index);664 return -EINVAL;665 }666 667 ret = __verify_planes_array(vb, b);668 if (!ret)669 vb2_core_querybuf(q, vb, b);670 return ret;671}672EXPORT_SYMBOL(vb2_querybuf);673 674static void vb2_set_flags_and_caps(struct vb2_queue *q, u32 memory,675 u32 *flags, u32 *caps, u32 *max_num_bufs)676{677 if (!q->allow_cache_hints || memory != V4L2_MEMORY_MMAP) {678 /*679 * This needs to clear V4L2_MEMORY_FLAG_NON_COHERENT only,680 * but in order to avoid bugs we zero out all bits.681 */682 *flags = 0;683 } else {684 /* Clear all unknown flags. */685 *flags &= V4L2_MEMORY_FLAG_NON_COHERENT;686 }687 688 *caps |= V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS;689 if (q->io_modes & VB2_MMAP)690 *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP;691 if (q->io_modes & VB2_USERPTR)692 *caps |= V4L2_BUF_CAP_SUPPORTS_USERPTR;693 if (q->io_modes & VB2_DMABUF)694 *caps |= V4L2_BUF_CAP_SUPPORTS_DMABUF;695 if (q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF)696 *caps |= V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF;697 if (q->allow_cache_hints && q->io_modes & VB2_MMAP)698 *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS;699 if (q->supports_requests)700 *caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS;701 if (max_num_bufs) {702 *max_num_bufs = q->max_num_buffers;703 *caps |= V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS;704 }705}706 707int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)708{709 int ret = vb2_verify_memory_type(q, req->memory, req->type);710 u32 flags = req->flags;711 712 vb2_set_flags_and_caps(q, req->memory, &flags,713 &req->capabilities, NULL);714 req->flags = flags;715 return ret ? ret : vb2_core_reqbufs(q, req->memory,716 req->flags, &req->count);717}718EXPORT_SYMBOL_GPL(vb2_reqbufs);719 720int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev,721 struct v4l2_buffer *b)722{723 struct vb2_buffer *vb;724 int ret;725 726 if (vb2_fileio_is_active(q)) {727 dprintk(q, 1, "file io in progress\n");728 return -EBUSY;729 }730 731 if (b->flags & V4L2_BUF_FLAG_REQUEST_FD)732 return -EINVAL;733 734 vb = vb2_get_buffer(q, b->index);735 if (!vb) {736 dprintk(q, 1, "can't find the requested buffer %u\n", b->index);737 return -EINVAL;738 }739 740 ret = vb2_queue_or_prepare_buf(q, mdev, vb, b, true, NULL);741 742 return ret ? ret : vb2_core_prepare_buf(q, vb, b);743}744EXPORT_SYMBOL_GPL(vb2_prepare_buf);745 746int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)747{748 unsigned requested_planes = 1;749 unsigned requested_sizes[VIDEO_MAX_PLANES];750 struct v4l2_format *f = &create->format;751 int ret = vb2_verify_memory_type(q, create->memory, f->type);752 unsigned i;753 754 create->index = vb2_get_num_buffers(q);755 vb2_set_flags_and_caps(q, create->memory, &create->flags,756 &create->capabilities, &create->max_num_buffers);757 if (create->count == 0)758 return ret != -EBUSY ? ret : 0;759 760 switch (f->type) {761 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:762 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:763 requested_planes = f->fmt.pix_mp.num_planes;764 if (requested_planes == 0 ||765 requested_planes > VIDEO_MAX_PLANES)766 return -EINVAL;767 for (i = 0; i < requested_planes; i++)768 requested_sizes[i] =769 f->fmt.pix_mp.plane_fmt[i].sizeimage;770 break;771 case V4L2_BUF_TYPE_VIDEO_CAPTURE:772 case V4L2_BUF_TYPE_VIDEO_OUTPUT:773 requested_sizes[0] = f->fmt.pix.sizeimage;774 break;775 case V4L2_BUF_TYPE_VBI_CAPTURE:776 case V4L2_BUF_TYPE_VBI_OUTPUT:777 requested_sizes[0] = f->fmt.vbi.samples_per_line *778 (f->fmt.vbi.count[0] + f->fmt.vbi.count[1]);779 break;780 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:781 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:782 requested_sizes[0] = f->fmt.sliced.io_size;783 break;784 case V4L2_BUF_TYPE_SDR_CAPTURE:785 case V4L2_BUF_TYPE_SDR_OUTPUT:786 requested_sizes[0] = f->fmt.sdr.buffersize;787 break;788 case V4L2_BUF_TYPE_META_CAPTURE:789 case V4L2_BUF_TYPE_META_OUTPUT:790 requested_sizes[0] = f->fmt.meta.buffersize;791 break;792 default:793 return -EINVAL;794 }795 for (i = 0; i < requested_planes; i++)796 if (requested_sizes[i] == 0)797 return -EINVAL;798 if (ret)799 return ret;800 801 return vb2_core_create_bufs(q, create->memory,802 create->flags,803 &create->count,804 requested_planes,805 requested_sizes,806 &create->index);807}808EXPORT_SYMBOL_GPL(vb2_create_bufs);809 810int vb2_qbuf(struct vb2_queue *q, struct media_device *mdev,811 struct v4l2_buffer *b)812{813 struct media_request *req = NULL;814 struct vb2_buffer *vb;815 int ret;816 817 if (vb2_fileio_is_active(q)) {818 dprintk(q, 1, "file io in progress\n");819 return -EBUSY;820 }821 822 vb = vb2_get_buffer(q, b->index);823 if (!vb) {824 dprintk(q, 1, "can't find the requested buffer %u\n", b->index);825 return -EINVAL;826 }827 828 ret = vb2_queue_or_prepare_buf(q, mdev, vb, b, false, &req);829 if (ret)830 return ret;831 ret = vb2_core_qbuf(q, vb, b, req);832 if (req)833 media_request_put(req);834 return ret;835}836EXPORT_SYMBOL_GPL(vb2_qbuf);837 838int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking)839{840 int ret;841 842 if (vb2_fileio_is_active(q)) {843 dprintk(q, 1, "file io in progress\n");844 return -EBUSY;845 }846 847 if (b->type != q->type) {848 dprintk(q, 1, "invalid buffer type\n");849 return -EINVAL;850 }851 852 ret = vb2_core_dqbuf(q, NULL, b, nonblocking);853 854 if (!q->is_output &&855 b->flags & V4L2_BUF_FLAG_DONE &&856 b->flags & V4L2_BUF_FLAG_LAST)857 q->last_buffer_dequeued = true;858 859 /*860 * After calling the VIDIOC_DQBUF V4L2_BUF_FLAG_DONE must be861 * cleared.862 */863 b->flags &= ~V4L2_BUF_FLAG_DONE;864 865 return ret;866}867EXPORT_SYMBOL_GPL(vb2_dqbuf);868 869int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type)870{871 if (vb2_fileio_is_active(q)) {872 dprintk(q, 1, "file io in progress\n");873 return -EBUSY;874 }875 return vb2_core_streamon(q, type);876}877EXPORT_SYMBOL_GPL(vb2_streamon);878 879int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type)880{881 if (vb2_fileio_is_active(q)) {882 dprintk(q, 1, "file io in progress\n");883 return -EBUSY;884 }885 return vb2_core_streamoff(q, type);886}887EXPORT_SYMBOL_GPL(vb2_streamoff);888 889int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb)890{891 struct vb2_buffer *vb;892 893 vb = vb2_get_buffer(q, eb->index);894 if (!vb) {895 dprintk(q, 1, "can't find the requested buffer %u\n", eb->index);896 return -EINVAL;897 }898 899 return vb2_core_expbuf(q, &eb->fd, eb->type, vb,900 eb->plane, eb->flags);901}902EXPORT_SYMBOL_GPL(vb2_expbuf);903 904int vb2_queue_init_name(struct vb2_queue *q, const char *name)905{906 /*907 * Sanity check908 */909 if (WARN_ON(!q) ||910 WARN_ON(q->timestamp_flags &911 ~(V4L2_BUF_FLAG_TIMESTAMP_MASK |912 V4L2_BUF_FLAG_TSTAMP_SRC_MASK)))913 return -EINVAL;914 915 /* Warn that the driver should choose an appropriate timestamp type */916 WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) ==917 V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN);918 919 /* Warn that vb2_memory should match with v4l2_memory */920 if (WARN_ON(VB2_MEMORY_MMAP != (int)V4L2_MEMORY_MMAP)921 || WARN_ON(VB2_MEMORY_USERPTR != (int)V4L2_MEMORY_USERPTR)922 || WARN_ON(VB2_MEMORY_DMABUF != (int)V4L2_MEMORY_DMABUF))923 return -EINVAL;924 925 if (q->buf_struct_size == 0)926 q->buf_struct_size = sizeof(struct vb2_v4l2_buffer);927 928 q->buf_ops = &v4l2_buf_ops;929 q->is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type);930 q->is_output = V4L2_TYPE_IS_OUTPUT(q->type);931 q->copy_timestamp = (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK)932 == V4L2_BUF_FLAG_TIMESTAMP_COPY;933 /*934 * For compatibility with vb1: if QBUF hasn't been called yet, then935 * return EPOLLERR as well. This only affects capture queues, output936 * queues will always initialize waiting_for_buffers to false.937 */938 q->quirk_poll_must_check_waiting_for_buffers = true;939 940 if (name)941 strscpy(q->name, name, sizeof(q->name));942 else943 q->name[0] = '\0';944 945 return vb2_core_queue_init(q);946}947EXPORT_SYMBOL_GPL(vb2_queue_init_name);948 949int vb2_queue_init(struct vb2_queue *q)950{951 return vb2_queue_init_name(q, NULL);952}953EXPORT_SYMBOL_GPL(vb2_queue_init);954 955void vb2_queue_release(struct vb2_queue *q)956{957 vb2_core_queue_release(q);958}959EXPORT_SYMBOL_GPL(vb2_queue_release);960 961int vb2_queue_change_type(struct vb2_queue *q, unsigned int type)962{963 if (type == q->type)964 return 0;965 966 if (vb2_is_busy(q))967 return -EBUSY;968 969 q->type = type;970 971 return 0;972}973EXPORT_SYMBOL_GPL(vb2_queue_change_type);974 975__poll_t vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)976{977 struct video_device *vfd = video_devdata(file);978 __poll_t res;979 980 res = vb2_core_poll(q, file, wait);981 982 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {983 struct v4l2_fh *fh = file->private_data;984 985 poll_wait(file, &fh->wait, wait);986 if (v4l2_event_pending(fh))987 res |= EPOLLPRI;988 }989 990 return res;991}992EXPORT_SYMBOL_GPL(vb2_poll);993 994/*995 * The following functions are not part of the vb2 core API, but are helper996 * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations997 * and struct vb2_ops.998 * They contain boilerplate code that most if not all drivers have to do999 * and so they simplify the driver code.1000 */1001 1002/* vb2 ioctl helpers */1003 1004int vb2_ioctl_remove_bufs(struct file *file, void *priv,1005 struct v4l2_remove_buffers *d)1006{1007 struct video_device *vdev = video_devdata(file);1008 1009 if (vdev->queue->type != d->type)1010 return -EINVAL;1011 1012 if (d->count == 0)1013 return 0;1014 1015 if (vb2_queue_is_busy(vdev->queue, file))1016 return -EBUSY;1017 1018 return vb2_core_remove_bufs(vdev->queue, d->index, d->count);1019}1020EXPORT_SYMBOL_GPL(vb2_ioctl_remove_bufs);1021 1022int vb2_ioctl_reqbufs(struct file *file, void *priv,1023 struct v4l2_requestbuffers *p)1024{1025 struct video_device *vdev = video_devdata(file);1026 int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type);1027 u32 flags = p->flags;1028 1029 vb2_set_flags_and_caps(vdev->queue, p->memory, &flags,1030 &p->capabilities, NULL);1031 p->flags = flags;1032 if (res)1033 return res;1034 if (vb2_queue_is_busy(vdev->queue, file))1035 return -EBUSY;1036 res = vb2_core_reqbufs(vdev->queue, p->memory, p->flags, &p->count);1037 /* If count == 0, then the owner has released all buffers and he1038 is no longer owner of the queue. Otherwise we have a new owner. */1039 if (res == 0)1040 vdev->queue->owner = p->count ? file->private_data : NULL;1041 return res;1042}1043EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs);1044 1045int vb2_ioctl_create_bufs(struct file *file, void *priv,1046 struct v4l2_create_buffers *p)1047{1048 struct video_device *vdev = video_devdata(file);1049 int res = vb2_verify_memory_type(vdev->queue, p->memory, p->format.type);1050 1051 p->index = vb2_get_num_buffers(vdev->queue);1052 vb2_set_flags_and_caps(vdev->queue, p->memory, &p->flags,1053 &p->capabilities, &p->max_num_buffers);1054 /*1055 * If count == 0, then just check if memory and type are valid.1056 * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0.1057 */1058 if (p->count == 0)1059 return res != -EBUSY ? res : 0;1060 if (res)1061 return res;1062 if (vb2_queue_is_busy(vdev->queue, file))1063 return -EBUSY;1064 1065 res = vb2_create_bufs(vdev->queue, p);1066 if (res == 0)1067 vdev->queue->owner = file->private_data;1068 return res;1069}1070EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs);1071 1072int vb2_ioctl_prepare_buf(struct file *file, void *priv,1073 struct v4l2_buffer *p)1074{1075 struct video_device *vdev = video_devdata(file);1076 1077 if (vb2_queue_is_busy(vdev->queue, file))1078 return -EBUSY;1079 return vb2_prepare_buf(vdev->queue, vdev->v4l2_dev->mdev, p);1080}1081EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf);1082 1083int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)1084{1085 struct video_device *vdev = video_devdata(file);1086 1087 /* No need to call vb2_queue_is_busy(), anyone can query buffers. */1088 return vb2_querybuf(vdev->queue, p);1089}1090EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf);1091 1092int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)1093{1094 struct video_device *vdev = video_devdata(file);1095 1096 if (vb2_queue_is_busy(vdev->queue, file))1097 return -EBUSY;1098 return vb2_qbuf(vdev->queue, vdev->v4l2_dev->mdev, p);1099}1100EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf);1101 1102int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)1103{1104 struct video_device *vdev = video_devdata(file);1105 1106 if (vb2_queue_is_busy(vdev->queue, file))1107 return -EBUSY;1108 return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK);1109}1110EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf);1111 1112int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i)1113{1114 struct video_device *vdev = video_devdata(file);1115 1116 if (vb2_queue_is_busy(vdev->queue, file))1117 return -EBUSY;1118 return vb2_streamon(vdev->queue, i);1119}1120EXPORT_SYMBOL_GPL(vb2_ioctl_streamon);1121 1122int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)1123{1124 struct video_device *vdev = video_devdata(file);1125 1126 if (vb2_queue_is_busy(vdev->queue, file))1127 return -EBUSY;1128 return vb2_streamoff(vdev->queue, i);1129}1130EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff);1131 1132int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p)1133{1134 struct video_device *vdev = video_devdata(file);1135 1136 if (vb2_queue_is_busy(vdev->queue, file))1137 return -EBUSY;1138 return vb2_expbuf(vdev->queue, p);1139}1140EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf);1141 1142/* v4l2_file_operations helpers */1143 1144int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma)1145{1146 struct video_device *vdev = video_devdata(file);1147 1148 return vb2_mmap(vdev->queue, vma);1149}1150EXPORT_SYMBOL_GPL(vb2_fop_mmap);1151 1152int _vb2_fop_release(struct file *file, struct mutex *lock)1153{1154 struct video_device *vdev = video_devdata(file);1155 1156 if (lock)1157 mutex_lock(lock);1158 if (!vdev->queue->owner || file->private_data == vdev->queue->owner) {1159 vb2_queue_release(vdev->queue);1160 vdev->queue->owner = NULL;1161 }1162 if (lock)1163 mutex_unlock(lock);1164 return v4l2_fh_release(file);1165}1166EXPORT_SYMBOL_GPL(_vb2_fop_release);1167 1168int vb2_fop_release(struct file *file)1169{1170 struct video_device *vdev = video_devdata(file);1171 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;1172 1173 return _vb2_fop_release(file, lock);1174}1175EXPORT_SYMBOL_GPL(vb2_fop_release);1176 1177ssize_t vb2_fop_write(struct file *file, const char __user *buf,1178 size_t count, loff_t *ppos)1179{1180 struct video_device *vdev = video_devdata(file);1181 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;1182 int err = -EBUSY;1183 1184 if (!(vdev->queue->io_modes & VB2_WRITE))1185 return -EINVAL;1186 if (lock && mutex_lock_interruptible(lock))1187 return -ERESTARTSYS;1188 if (vb2_queue_is_busy(vdev->queue, file))1189 goto exit;1190 err = vb2_write(vdev->queue, buf, count, ppos,1191 file->f_flags & O_NONBLOCK);1192 if (vdev->queue->fileio)1193 vdev->queue->owner = file->private_data;1194exit:1195 if (lock)1196 mutex_unlock(lock);1197 return err;1198}1199EXPORT_SYMBOL_GPL(vb2_fop_write);1200 1201ssize_t vb2_fop_read(struct file *file, char __user *buf,1202 size_t count, loff_t *ppos)1203{1204 struct video_device *vdev = video_devdata(file);1205 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;1206 int err = -EBUSY;1207 1208 if (!(vdev->queue->io_modes & VB2_READ))1209 return -EINVAL;1210 if (lock && mutex_lock_interruptible(lock))1211 return -ERESTARTSYS;1212 if (vb2_queue_is_busy(vdev->queue, file))1213 goto exit;1214 vdev->queue->owner = file->private_data;1215 err = vb2_read(vdev->queue, buf, count, ppos,1216 file->f_flags & O_NONBLOCK);1217 if (!vdev->queue->fileio)1218 vdev->queue->owner = NULL;1219exit:1220 if (lock)1221 mutex_unlock(lock);1222 return err;1223}1224EXPORT_SYMBOL_GPL(vb2_fop_read);1225 1226__poll_t vb2_fop_poll(struct file *file, poll_table *wait)1227{1228 struct video_device *vdev = video_devdata(file);1229 struct vb2_queue *q = vdev->queue;1230 struct mutex *lock = q->lock ? q->lock : vdev->lock;1231 __poll_t res;1232 void *fileio;1233 1234 /*1235 * If this helper doesn't know how to lock, then you shouldn't be using1236 * it but you should write your own.1237 */1238 WARN_ON(!lock);1239 1240 if (lock && mutex_lock_interruptible(lock))1241 return EPOLLERR;1242 1243 fileio = q->fileio;1244 1245 res = vb2_poll(vdev->queue, file, wait);1246 1247 /* If fileio was started, then we have a new queue owner. */1248 if (!fileio && q->fileio)1249 q->owner = file->private_data;1250 if (lock)1251 mutex_unlock(lock);1252 return res;1253}1254EXPORT_SYMBOL_GPL(vb2_fop_poll);1255 1256#ifndef CONFIG_MMU1257unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr,1258 unsigned long len, unsigned long pgoff, unsigned long flags)1259{1260 struct video_device *vdev = video_devdata(file);1261 1262 return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags);1263}1264EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area);1265#endif1266 1267void vb2_video_unregister_device(struct video_device *vdev)1268{1269 /* Check if vdev was ever registered at all */1270 if (!vdev || !video_is_registered(vdev))1271 return;1272 1273 /*1274 * Calling this function only makes sense if vdev->queue is set.1275 * If it is NULL, then just call video_unregister_device() instead.1276 */1277 WARN_ON(!vdev->queue);1278 1279 /*1280 * Take a reference to the device since video_unregister_device()1281 * calls device_unregister(), but we don't want that to release1282 * the device since we want to clean up the queue first.1283 */1284 get_device(&vdev->dev);1285 video_unregister_device(vdev);1286 if (vdev->queue) {1287 struct mutex *lock = vdev->queue->lock ?1288 vdev->queue->lock : vdev->lock;1289 1290 if (lock)1291 mutex_lock(lock);1292 vb2_queue_release(vdev->queue);1293 vdev->queue->owner = NULL;1294 if (lock)1295 mutex_unlock(lock);1296 }1297 /*1298 * Now we put the device, and in most cases this will release1299 * everything.1300 */1301 put_device(&vdev->dev);1302}1303EXPORT_SYMBOL_GPL(vb2_video_unregister_device);1304 1305/* vb2_ops helpers. Only use if vq->lock is non-NULL. */1306 1307void vb2_ops_wait_prepare(struct vb2_queue *vq)1308{1309 mutex_unlock(vq->lock);1310}1311EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare);1312 1313void vb2_ops_wait_finish(struct vb2_queue *vq)1314{1315 mutex_lock(vq->lock);1316}1317EXPORT_SYMBOL_GPL(vb2_ops_wait_finish);1318 1319/*1320 * Note that this function is called during validation time and1321 * thus the req_queue_mutex is held to ensure no request objects1322 * can be added or deleted while validating. So there is no need1323 * to protect the objects list.1324 */1325int vb2_request_validate(struct media_request *req)1326{1327 struct media_request_object *obj;1328 int ret = 0;1329 1330 if (!vb2_request_buffer_cnt(req))1331 return -ENOENT;1332 1333 list_for_each_entry(obj, &req->objects, list) {1334 if (!obj->ops->prepare)1335 continue;1336 1337 ret = obj->ops->prepare(obj);1338 if (ret)1339 break;1340 }1341 1342 if (ret) {1343 list_for_each_entry_continue_reverse(obj, &req->objects, list)1344 if (obj->ops->unprepare)1345 obj->ops->unprepare(obj);1346 return ret;1347 }1348 return 0;1349}1350EXPORT_SYMBOL_GPL(vb2_request_validate);1351 1352void vb2_request_queue(struct media_request *req)1353{1354 struct media_request_object *obj, *obj_safe;1355 1356 /*1357 * Queue all objects. Note that buffer objects are at the end of the1358 * objects list, after all other object types. Once buffer objects1359 * are queued, the driver might delete them immediately (if the driver1360 * processes the buffer at once), so we have to use1361 * list_for_each_entry_safe() to handle the case where the object we1362 * queue is deleted.1363 */1364 list_for_each_entry_safe(obj, obj_safe, &req->objects, list)1365 if (obj->ops->queue)1366 obj->ops->queue(obj);1367}1368EXPORT_SYMBOL_GPL(vb2_request_queue);1369 1370MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2");1371MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski");1372MODULE_LICENSE("GPL");1373