1/* 2 * videobuf2-v4l2.c - V4L2 driver helper framework 3 * 4 * Copyright (C) 2010 Samsung Electronics 5 * 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 modify 13 * it under the terms of the GNU General Public License as published by 14 * 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 struct 62 * v4l2_buffer from userspace can be safely used 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 /* 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 in 93 * 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].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->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 struct 133 */ 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 else 173 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 field 192 * should be either TOP or BOTTOM, not ALTERNATE since that 193 * makes no sense. The driver has to know whether the 194 * buffer represents a top or a bottom field in order to 195 * program any DMA correctly. Using ALTERNATE is wrong, since 196 * 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 starts 238 * accepting variable number of planes. 239 * 240 * If bytesused == 0 for the output buffer, then fall 241 * back to the full buffer size. In that case 242 * userspace clearly never bothered to set it and 243 * it's a safe assumption that they really meant to 244 * use the full plane sizes. 245 * 246 * Some drivers, e.g. old codec drivers, use bytesused == 0 247 * as a way to indicate that streaming is finished. 248 * In that case, the driver should use the 249 * allow_zero_bytesused flag to keep old userspace 250 * 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 else 262 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 videobuf we use our internal V4l2_planes struct for 272 * single-planar buffers as well, for simplicity. 273 * 274 * If bytesused == 0 for the output buffer, then fall back 275 * to the full buffer size as that's a sensible default. 276 * 277 * Some drivers, e.g. old codec drivers, use bytesused == 0 as 278 * a way to indicate that streaming is finished. In that case, 279 * the driver should use the allow_zero_bytesused flag to keep 280 * 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 else 305 planes[0].bytesused = b->bytesused ? 306 b->bytesused : planes[0].length; 307 } else 308 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 get 317 * their timestamp and timestamp source flags from the 318 * 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 buffer 328 * 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 /* 349 * DMA exporter should take care of cache syncs, so we can avoid 350 * explicit ->prepare()/->finish() syncs. For other ->memory types 351 * we always need ->prepare() or/and ->finish() cache sync. 352 */ 353 if (q->memory == VB2_MEMORY_DMABUF) { 354 vb->need_cache_sync_on_finish = 0; 355 vb->need_cache_sync_on_prepare = 0; 356 return; 357 } 358 359 /* 360 * Cache sync/invalidation flags are set by default in order to 361 * preserve existing behaviour for old apps/drivers. 362 */ 363 vb->need_cache_sync_on_prepare = 1; 364 vb->need_cache_sync_on_finish = 1; 365 366 if (!vb2_queue_allows_cache_hints(q)) { 367 /* 368 * Clear buffer cache flags if queue does not support user 369 * space hints. That's to indicate to userspace that these 370 * flags won't work. 371 */ 372 b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_INVALIDATE; 373 b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_CLEAN; 374 return; 375 } 376 377 /* 378 * ->finish() cache sync can be avoided when queue direction is 379 * TO_DEVICE. 380 */ 381 if (q->dma_dir == DMA_TO_DEVICE) 382 vb->need_cache_sync_on_finish = 0; 383 384 if (b->flags & V4L2_BUF_FLAG_NO_CACHE_INVALIDATE) 385 vb->need_cache_sync_on_finish = 0; 386 387 if (b->flags & V4L2_BUF_FLAG_NO_CACHE_CLEAN) 388 vb->need_cache_sync_on_prepare = 0; 389} 390 391static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *mdev, 392 struct v4l2_buffer *b, bool is_prepare, 393 struct media_request **p_req) 394{ 395 const char *opname = is_prepare ? "prepare_buf" : "qbuf"; 396 struct media_request *req; 397 struct vb2_v4l2_buffer *vbuf; 398 struct vb2_buffer *vb; 399 int ret; 400 401 if (b->type != q->type) { 402 dprintk(q, 1, "%s: invalid buffer type\n", opname); 403 return -EINVAL; 404 } 405 406 if (b->index >= q->num_buffers) { 407 dprintk(q, 1, "%s: buffer index out of range\n", opname); 408 return -EINVAL; 409 } 410 411 if (q->bufs[b->index] == NULL) { 412 /* Should never happen */ 413 dprintk(q, 1, "%s: buffer is NULL\n", opname); 414 return -EINVAL; 415 } 416 417 if (b->memory != q->memory) { 418 dprintk(q, 1, "%s: invalid memory type\n", opname); 419 return -EINVAL; 420 } 421 422 vb = q->bufs[b->index]; 423 vbuf = to_vb2_v4l2_buffer(vb); 424 ret = __verify_planes_array(vb, b); 425 if (ret) 426 return ret; 427 428 if (!is_prepare && (b->flags & V4L2_BUF_FLAG_REQUEST_FD) && 429 vb->state != VB2_BUF_STATE_DEQUEUED) { 430 dprintk(q, 1, "%s: buffer is not in dequeued state\n", opname); 431 return -EINVAL; 432 } 433 434 if (!vb->prepared) { 435 set_buffer_cache_hints(q, vb, b); 436 /* Copy relevant information provided by the userspace */ 437 memset(vbuf->planes, 0, 438 sizeof(vbuf->planes[0]) * vb->num_planes); 439 ret = vb2_fill_vb2_v4l2_buffer(vb, b); 440 if (ret) 441 return ret; 442 } 443 444 if (is_prepare) 445 return 0; 446 447 if (!(b->flags & V4L2_BUF_FLAG_REQUEST_FD)) { 448 if (q->requires_requests) { 449 dprintk(q, 1, "%s: queue requires requests\n", opname); 450 return -EBADR; 451 } 452 if (q->uses_requests) { 453 dprintk(q, 1, "%s: queue uses requests\n", opname); 454 return -EBUSY; 455 } 456 return 0; 457 } else if (!q->supports_requests) { 458 dprintk(q, 1, "%s: queue does not support requests\n", opname); 459 return -EBADR; 460 } else if (q->uses_qbuf) { 461 dprintk(q, 1, "%s: queue does not use requests\n", opname); 462 return -EBUSY; 463 } 464 465 /* 466 * For proper locking when queueing a request you need to be able 467 * to lock access to the vb2 queue, so check that there is a lock 468 * that we can use. In addition p_req must be non-NULL. 469 */ 470 if (WARN_ON(!q->lock || !p_req)) 471 return -EINVAL; 472 473 /* 474 * Make sure this op is implemented by the driver. It's easy to forget 475 * this callback, but is it important when canceling a buffer in a 476 * queued request. 477 */ 478 if (WARN_ON(!q->ops->buf_request_complete)) 479 return -EINVAL; 480 /* 481 * Make sure this op is implemented by the driver for the output queue. 482 * It's easy to forget this callback, but is it important to correctly 483 * validate the 'field' value at QBUF time. 484 */ 485 if (WARN_ON((q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT || 486 q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) && 487 !q->ops->buf_out_validate)) 488 return -EINVAL; 489 490 if (b->request_fd < 0) { 491 dprintk(q, 1, "%s: request_fd < 0\n", opname); 492 return -EINVAL; 493 } 494 495 req = media_request_get_by_fd(mdev, b->request_fd); 496 if (IS_ERR(req)) { 497 dprintk(q, 1, "%s: invalid request_fd\n", opname); 498 return PTR_ERR(req); 499 } 500 501 /* 502 * Early sanity check. This is checked again when the buffer 503 * is bound to the request in vb2_core_qbuf(). 504 */ 505 if (req->state != MEDIA_REQUEST_STATE_IDLE && 506 req->state != MEDIA_REQUEST_STATE_UPDATING) { 507 dprintk(q, 1, "%s: request is not idle\n", opname); 508 media_request_put(req); 509 return -EBUSY; 510 } 511 512 *p_req = req; 513 vbuf->request_fd = b->request_fd; 514 515 return 0; 516} 517 518/* 519 * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be 520 * returned to userspace 521 */ 522static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb) 523{ 524 struct v4l2_buffer *b = pb; 525 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 526 struct vb2_queue *q = vb->vb2_queue; 527 unsigned int plane; 528 529 /* Copy back data such as timestamp, flags, etc. */ 530 b->index = vb->index; 531 b->type = vb->type; 532 b->memory = vb->memory; 533 b->bytesused = 0; 534 535 b->flags = vbuf->flags; 536 b->field = vbuf->field; 537 v4l2_buffer_set_timestamp(b, vb->timestamp); 538 b->timecode = vbuf->timecode; 539 b->sequence = vbuf->sequence; 540 b->reserved2 = 0; 541 b->request_fd = 0; 542 543 if (q->is_multiplanar) { 544 /* 545 * Fill in plane-related data if userspace provided an array 546 * for it. The caller has already verified memory and size. 547 */ 548 b->length = vb->num_planes; 549 for (plane = 0; plane < vb->num_planes; ++plane) { 550 struct v4l2_plane *pdst = &b->m.planes[plane]; 551 struct vb2_plane *psrc = &vb->planes[plane]; 552 553 pdst->bytesused = psrc->bytesused; 554 pdst->length = psrc->length; 555 if (q->memory == VB2_MEMORY_MMAP) 556 pdst->m.mem_offset = psrc->m.offset; 557 else if (q->memory == VB2_MEMORY_USERPTR) 558 pdst->m.userptr = psrc->m.userptr; 559 else if (q->memory == VB2_MEMORY_DMABUF) 560 pdst->m.fd = psrc->m.fd; 561 pdst->data_offset = psrc->data_offset; 562 memset(pdst->reserved, 0, sizeof(pdst->reserved)); 563 } 564 } else { 565 /* 566 * We use length and offset in v4l2_planes array even for 567 * single-planar buffers, but userspace does not. 568 */ 569 b->length = vb->planes[0].length; 570 b->bytesused = vb->planes[0].bytesused; 571 if (q->memory == VB2_MEMORY_MMAP) 572 b->m.offset = vb->planes[0].m.offset; 573 else if (q->memory == VB2_MEMORY_USERPTR) 574 b->m.userptr = vb->planes[0].m.userptr; 575 else if (q->memory == VB2_MEMORY_DMABUF) 576 b->m.fd = vb->planes[0].m.fd; 577 } 578 579 /* 580 * Clear any buffer state related flags. 581 */ 582 b->flags &= ~V4L2_BUFFER_MASK_FLAGS; 583 b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK; 584 if (!q->copy_timestamp) { 585 /* 586 * For non-COPY timestamps, drop timestamp source bits 587 * and obtain the timestamp source from the queue. 588 */ 589 b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; 590 b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK; 591 } 592 593 switch (vb->state) { 594 case VB2_BUF_STATE_QUEUED: 595 case VB2_BUF_STATE_ACTIVE: 596 b->flags |= V4L2_BUF_FLAG_QUEUED; 597 break; 598 case VB2_BUF_STATE_IN_REQUEST: 599 b->flags |= V4L2_BUF_FLAG_IN_REQUEST; 600 break; 601 case VB2_BUF_STATE_ERROR: 602 b->flags |= V4L2_BUF_FLAG_ERROR; 603 fallthrough; 604 case VB2_BUF_STATE_DONE: 605 b->flags |= V4L2_BUF_FLAG_DONE; 606 break; 607 case VB2_BUF_STATE_PREPARING: 608 case VB2_BUF_STATE_DEQUEUED: 609 /* nothing */ 610 break; 611 } 612 613 if ((vb->state == VB2_BUF_STATE_DEQUEUED || 614 vb->state == VB2_BUF_STATE_IN_REQUEST) && 615 vb->synced && vb->prepared) 616 b->flags |= V4L2_BUF_FLAG_PREPARED; 617 618 if (vb2_buffer_in_use(q, vb)) 619 b->flags |= V4L2_BUF_FLAG_MAPPED; 620 if (vbuf->request_fd >= 0) { 621 b->flags |= V4L2_BUF_FLAG_REQUEST_FD; 622 b->request_fd = vbuf->request_fd; 623 } 624} 625 626/* 627 * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a 628 * v4l2_buffer by the userspace. It also verifies that struct 629 * v4l2_buffer has a valid number of planes. 630 */ 631static int __fill_vb2_buffer(struct vb2_buffer *vb, struct vb2_plane *planes) 632{ 633 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 634 unsigned int plane; 635 636 if (!vb->vb2_queue->copy_timestamp) 637 vb->timestamp = 0; 638 639 for (plane = 0; plane < vb->num_planes; ++plane) { 640 if (vb->vb2_queue->memory != VB2_MEMORY_MMAP) { 641 planes[plane].m = vbuf->planes[plane].m; 642 planes[plane].length = vbuf->planes[plane].length; 643 } 644 planes[plane].bytesused = vbuf->planes[plane].bytesused; 645 planes[plane].data_offset = vbuf->planes[plane].data_offset; 646 } 647 return 0; 648} 649 650static const struct vb2_buf_ops v4l2_buf_ops = { 651 .verify_planes_array = __verify_planes_array_core, 652 .init_buffer = __init_vb2_v4l2_buffer, 653 .fill_user_buffer = __fill_v4l2_buffer, 654 .fill_vb2_buffer = __fill_vb2_buffer, 655 .copy_timestamp = __copy_timestamp, 656}; 657 658int vb2_find_timestamp(const struct vb2_queue *q, u64 timestamp, 659 unsigned int start_idx) 660{ 661 unsigned int i; 662 663 for (i = start_idx; i < q->num_buffers; i++) 664 if (q->bufs[i]->copied_timestamp && 665 q->bufs[i]->timestamp == timestamp) 666 return i; 667 return -1; 668} 669EXPORT_SYMBOL_GPL(vb2_find_timestamp); 670 671/* 672 * vb2_querybuf() - query video buffer information 673 * @q: videobuf queue 674 * @b: buffer struct passed from userspace to vidioc_querybuf handler 675 * in driver 676 * 677 * Should be called from vidioc_querybuf ioctl handler in driver. 678 * This function will verify the passed v4l2_buffer structure and fill the 679 * relevant information for the userspace. 680 * 681 * The return values from this function are intended to be directly returned 682 * from vidioc_querybuf handler in driver. 683 */ 684int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) 685{ 686 struct vb2_buffer *vb; 687 int ret; 688 689 if (b->type != q->type) { 690 dprintk(q, 1, "wrong buffer type\n"); 691 return -EINVAL; 692 } 693 694 if (b->index >= q->num_buffers) { 695 dprintk(q, 1, "buffer index out of range\n"); 696 return -EINVAL; 697 } 698 vb = q->bufs[b->index]; 699 ret = __verify_planes_array(vb, b); 700 if (!ret) 701 vb2_core_querybuf(q, b->index, b); 702 return ret; 703} 704EXPORT_SYMBOL(vb2_querybuf); 705 706static void fill_buf_caps(struct vb2_queue *q, u32 *caps) 707{ 708 *caps = V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS; 709 if (q->io_modes & VB2_MMAP) 710 *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP; 711 if (q->io_modes & VB2_USERPTR) 712 *caps |= V4L2_BUF_CAP_SUPPORTS_USERPTR; 713 if (q->io_modes & VB2_DMABUF) 714 *caps |= V4L2_BUF_CAP_SUPPORTS_DMABUF; 715 if (q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF) 716 *caps |= V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF; 717 if (q->allow_cache_hints && q->io_modes & VB2_MMAP) 718 *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS; 719#ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API 720 if (q->supports_requests) 721 *caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS; 722#endif 723} 724 725int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) 726{ 727 int ret = vb2_verify_memory_type(q, req->memory, req->type); 728 729 fill_buf_caps(q, &req->capabilities); 730 return ret ? ret : vb2_core_reqbufs(q, req->memory, &req->count); 731} 732EXPORT_SYMBOL_GPL(vb2_reqbufs); 733 734int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev, 735 struct v4l2_buffer *b) 736{ 737 int ret; 738 739 if (vb2_fileio_is_active(q)) { 740 dprintk(q, 1, "file io in progress\n"); 741 return -EBUSY; 742 } 743 744 if (b->flags & V4L2_BUF_FLAG_REQUEST_FD) 745 return -EINVAL; 746 747 ret = vb2_queue_or_prepare_buf(q, mdev, b, true, NULL); 748 749 return ret ? ret : vb2_core_prepare_buf(q, b->index, b); 750} 751EXPORT_SYMBOL_GPL(vb2_prepare_buf); 752 753int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) 754{ 755 unsigned requested_planes = 1; 756 unsigned requested_sizes[VIDEO_MAX_PLANES]; 757 struct v4l2_format *f = &create->format; 758 int ret = vb2_verify_memory_type(q, create->memory, f->type); 759 unsigned i; 760 761 fill_buf_caps(q, &create->capabilities); 762 create->index = q->num_buffers; 763 if (create->count == 0) 764 return ret != -EBUSY ? ret : 0; 765 766 switch (f->type) { 767 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE: 768 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE: 769 requested_planes = f->fmt.pix_mp.num_planes; 770 if (requested_planes == 0 || 771 requested_planes > VIDEO_MAX_PLANES) 772 return -EINVAL; 773 for (i = 0; i < requested_planes; i++) 774 requested_sizes[i] = 775 f->fmt.pix_mp.plane_fmt[i].sizeimage; 776 break; 777 case V4L2_BUF_TYPE_VIDEO_CAPTURE: 778 case V4L2_BUF_TYPE_VIDEO_OUTPUT: 779 requested_sizes[0] = f->fmt.pix.sizeimage; 780 break; 781 case V4L2_BUF_TYPE_VBI_CAPTURE: 782 case V4L2_BUF_TYPE_VBI_OUTPUT: 783 requested_sizes[0] = f->fmt.vbi.samples_per_line * 784 (f->fmt.vbi.count[0] + f->fmt.vbi.count[1]); 785 break; 786 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE: 787 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: 788 requested_sizes[0] = f->fmt.sliced.io_size; 789 break; 790 case V4L2_BUF_TYPE_SDR_CAPTURE: 791 case V4L2_BUF_TYPE_SDR_OUTPUT: 792 requested_sizes[0] = f->fmt.sdr.buffersize; 793 break; 794 case V4L2_BUF_TYPE_META_CAPTURE: 795 case V4L2_BUF_TYPE_META_OUTPUT: 796 requested_sizes[0] = f->fmt.meta.buffersize; 797 break; 798 default: 799 return -EINVAL; 800 } 801 for (i = 0; i < requested_planes; i++) 802 if (requested_sizes[i] == 0) 803 return -EINVAL; 804 return ret ? ret : vb2_core_create_bufs(q, create->memory, 805 &create->count, 806 requested_planes, 807 requested_sizes); 808} 809EXPORT_SYMBOL_GPL(vb2_create_bufs); 810 811int vb2_qbuf(struct vb2_queue *q, struct media_device *mdev, 812 struct v4l2_buffer *b) 813{ 814 struct media_request *req = NULL; 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 ret = vb2_queue_or_prepare_buf(q, mdev, b, false, &req); 823 if (ret) 824 return ret; 825 ret = vb2_core_qbuf(q, b->index, b, req); 826 if (req) 827 media_request_put(req); 828 return ret; 829} 830EXPORT_SYMBOL_GPL(vb2_qbuf); 831 832int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) 833{ 834 int ret; 835 836 if (vb2_fileio_is_active(q)) { 837 dprintk(q, 1, "file io in progress\n"); 838 return -EBUSY; 839 } 840 841 if (b->type != q->type) { 842 dprintk(q, 1, "invalid buffer type\n"); 843 return -EINVAL; 844 } 845 846 ret = vb2_core_dqbuf(q, NULL, b, nonblocking); 847 848 if (!q->is_output && 849 b->flags & V4L2_BUF_FLAG_DONE && 850 b->flags & V4L2_BUF_FLAG_LAST) 851 q->last_buffer_dequeued = true; 852 853 /* 854 * After calling the VIDIOC_DQBUF V4L2_BUF_FLAG_DONE must be 855 * cleared. 856 */ 857 b->flags &= ~V4L2_BUF_FLAG_DONE; 858 859 return ret; 860} 861EXPORT_SYMBOL_GPL(vb2_dqbuf); 862 863int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) 864{ 865 if (vb2_fileio_is_active(q)) { 866 dprintk(q, 1, "file io in progress\n"); 867 return -EBUSY; 868 } 869 return vb2_core_streamon(q, type); 870} 871EXPORT_SYMBOL_GPL(vb2_streamon); 872 873int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) 874{ 875 if (vb2_fileio_is_active(q)) { 876 dprintk(q, 1, "file io in progress\n"); 877 return -EBUSY; 878 } 879 return vb2_core_streamoff(q, type); 880} 881EXPORT_SYMBOL_GPL(vb2_streamoff); 882 883int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb) 884{ 885 return vb2_core_expbuf(q, &eb->fd, eb->type, eb->index, 886 eb->plane, eb->flags); 887} 888EXPORT_SYMBOL_GPL(vb2_expbuf); 889 890int vb2_queue_init_name(struct vb2_queue *q, const char *name) 891{ 892 /* 893 * Sanity check 894 */ 895 if (WARN_ON(!q) || 896 WARN_ON(q->timestamp_flags & 897 ~(V4L2_BUF_FLAG_TIMESTAMP_MASK | 898 V4L2_BUF_FLAG_TSTAMP_SRC_MASK))) 899 return -EINVAL; 900 901 /* Warn that the driver should choose an appropriate timestamp type */ 902 WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == 903 V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); 904 905 /* Warn that vb2_memory should match with v4l2_memory */ 906 if (WARN_ON(VB2_MEMORY_MMAP != (int)V4L2_MEMORY_MMAP) 907 || WARN_ON(VB2_MEMORY_USERPTR != (int)V4L2_MEMORY_USERPTR) 908 || WARN_ON(VB2_MEMORY_DMABUF != (int)V4L2_MEMORY_DMABUF)) 909 return -EINVAL; 910 911 if (q->buf_struct_size == 0) 912 q->buf_struct_size = sizeof(struct vb2_v4l2_buffer); 913 914 q->buf_ops = &v4l2_buf_ops; 915 q->is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); 916 q->is_output = V4L2_TYPE_IS_OUTPUT(q->type); 917 q->copy_timestamp = (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) 918 == V4L2_BUF_FLAG_TIMESTAMP_COPY; 919 /* 920 * For compatibility with vb1: if QBUF hasn't been called yet, then 921 * return EPOLLERR as well. This only affects capture queues, output 922 * queues will always initialize waiting_for_buffers to false. 923 */ 924 q->quirk_poll_must_check_waiting_for_buffers = true; 925 926 if (name) 927 strscpy(q->name, name, sizeof(q->name)); 928 else 929 q->name[0] = '\0'; 930 931 return vb2_core_queue_init(q); 932} 933EXPORT_SYMBOL_GPL(vb2_queue_init_name); 934 935int vb2_queue_init(struct vb2_queue *q) 936{ 937 return vb2_queue_init_name(q, NULL); 938} 939EXPORT_SYMBOL_GPL(vb2_queue_init); 940 941void vb2_queue_release(struct vb2_queue *q) 942{ 943 vb2_core_queue_release(q); 944} 945EXPORT_SYMBOL_GPL(vb2_queue_release); 946 947__poll_t vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) 948{ 949 struct video_device *vfd = video_devdata(file); 950 __poll_t res; 951 952 res = vb2_core_poll(q, file, wait); 953 954 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { 955 struct v4l2_fh *fh = file->private_data; 956 957 poll_wait(file, &fh->wait, wait); 958 if (v4l2_event_pending(fh)) 959 res |= EPOLLPRI; 960 } 961 962 return res; 963} 964EXPORT_SYMBOL_GPL(vb2_poll); 965 966/* 967 * The following functions are not part of the vb2 core API, but are helper 968 * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations 969 * and struct vb2_ops. 970 * They contain boilerplate code that most if not all drivers have to do 971 * and so they simplify the driver code. 972 */ 973 974/* The queue is busy if there is a owner and you are not that owner. */ 975static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file) 976{ 977 return vdev->queue->owner && vdev->queue->owner != file->private_data; 978} 979 980/* vb2 ioctl helpers */ 981 982int vb2_ioctl_reqbufs(struct file *file, void *priv, 983 struct v4l2_requestbuffers *p) 984{ 985 struct video_device *vdev = video_devdata(file); 986 int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type); 987 988 fill_buf_caps(vdev->queue, &p->capabilities); 989 if (res) 990 return res; 991 if (vb2_queue_is_busy(vdev, file)) 992 return -EBUSY; 993 res = vb2_core_reqbufs(vdev->queue, p->memory, &p->count); 994 /* If count == 0, then the owner has released all buffers and he 995 is no longer owner of the queue. Otherwise we have a new owner. */ 996 if (res == 0) 997 vdev->queue->owner = p->count ? file->private_data : NULL; 998 return res; 999} 1000EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); 1001 1002int vb2_ioctl_create_bufs(struct file *file, void *priv, 1003 struct v4l2_create_buffers *p) 1004{ 1005 struct video_device *vdev = video_devdata(file); 1006 int res = vb2_verify_memory_type(vdev->queue, p->memory, 1007 p->format.type); 1008 1009 p->index = vdev->queue->num_buffers; 1010 fill_buf_caps(vdev->queue, &p->capabilities); 1011 /* 1012 * If count == 0, then just check if memory and type are valid. 1013 * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0. 1014 */ 1015 if (p->count == 0) 1016 return res != -EBUSY ? res : 0; 1017 if (res) 1018 return res; 1019 if (vb2_queue_is_busy(vdev, file)) 1020 return -EBUSY; 1021 1022 res = vb2_create_bufs(vdev->queue, p); 1023 if (res == 0) 1024 vdev->queue->owner = file->private_data; 1025 return res; 1026} 1027EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); 1028 1029int vb2_ioctl_prepare_buf(struct file *file, void *priv, 1030 struct v4l2_buffer *p) 1031{ 1032 struct video_device *vdev = video_devdata(file); 1033 1034 if (vb2_queue_is_busy(vdev, file)) 1035 return -EBUSY; 1036 return vb2_prepare_buf(vdev->queue, vdev->v4l2_dev->mdev, p); 1037} 1038EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); 1039 1040int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) 1041{ 1042 struct video_device *vdev = video_devdata(file); 1043 1044 /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ 1045 return vb2_querybuf(vdev->queue, p); 1046} 1047EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); 1048 1049int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) 1050{ 1051 struct video_device *vdev = video_devdata(file); 1052 1053 if (vb2_queue_is_busy(vdev, file)) 1054 return -EBUSY; 1055 return vb2_qbuf(vdev->queue, vdev->v4l2_dev->mdev, p); 1056} 1057EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); 1058 1059int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) 1060{ 1061 struct video_device *vdev = video_devdata(file); 1062 1063 if (vb2_queue_is_busy(vdev, file)) 1064 return -EBUSY; 1065 return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); 1066} 1067EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); 1068 1069int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) 1070{ 1071 struct video_device *vdev = video_devdata(file); 1072 1073 if (vb2_queue_is_busy(vdev, file)) 1074 return -EBUSY; 1075 return vb2_streamon(vdev->queue, i); 1076} 1077EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); 1078 1079int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) 1080{ 1081 struct video_device *vdev = video_devdata(file); 1082 1083 if (vb2_queue_is_busy(vdev, file)) 1084 return -EBUSY; 1085 return vb2_streamoff(vdev->queue, i); 1086} 1087EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); 1088 1089int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) 1090{ 1091 struct video_device *vdev = video_devdata(file); 1092 1093 if (vb2_queue_is_busy(vdev, file)) 1094 return -EBUSY; 1095 return vb2_expbuf(vdev->queue, p); 1096} 1097EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); 1098 1099/* v4l2_file_operations helpers */ 1100 1101int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) 1102{ 1103 struct video_device *vdev = video_devdata(file); 1104 1105 return vb2_mmap(vdev->queue, vma); 1106} 1107EXPORT_SYMBOL_GPL(vb2_fop_mmap); 1108 1109int _vb2_fop_release(struct file *file, struct mutex *lock) 1110{ 1111 struct video_device *vdev = video_devdata(file); 1112 1113 if (lock) 1114 mutex_lock(lock); 1115 if (file->private_data == vdev->queue->owner) { 1116 vb2_queue_release(vdev->queue); 1117 vdev->queue->owner = NULL; 1118 } 1119 if (lock) 1120 mutex_unlock(lock); 1121 return v4l2_fh_release(file); 1122} 1123EXPORT_SYMBOL_GPL(_vb2_fop_release); 1124 1125int vb2_fop_release(struct file *file) 1126{ 1127 struct video_device *vdev = video_devdata(file); 1128 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; 1129 1130 return _vb2_fop_release(file, lock); 1131} 1132EXPORT_SYMBOL_GPL(vb2_fop_release); 1133 1134ssize_t vb2_fop_write(struct file *file, const char __user *buf, 1135 size_t count, loff_t *ppos) 1136{ 1137 struct video_device *vdev = video_devdata(file); 1138 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; 1139 int err = -EBUSY; 1140 1141 if (!(vdev->queue->io_modes & VB2_WRITE)) 1142 return -EINVAL; 1143 if (lock && mutex_lock_interruptible(lock)) 1144 return -ERESTARTSYS; 1145 if (vb2_queue_is_busy(vdev, file)) 1146 goto exit; 1147 err = vb2_write(vdev->queue, buf, count, ppos, 1148 file->f_flags & O_NONBLOCK); 1149 if (vdev->queue->fileio) 1150 vdev->queue->owner = file->private_data; 1151exit: 1152 if (lock) 1153 mutex_unlock(lock); 1154 return err; 1155} 1156EXPORT_SYMBOL_GPL(vb2_fop_write); 1157 1158ssize_t vb2_fop_read(struct file *file, char __user *buf, 1159 size_t count, loff_t *ppos) 1160{ 1161 struct video_device *vdev = video_devdata(file); 1162 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; 1163 int err = -EBUSY; 1164 1165 if (!(vdev->queue->io_modes & VB2_READ)) 1166 return -EINVAL; 1167 if (lock && mutex_lock_interruptible(lock)) 1168 return -ERESTARTSYS; 1169 if (vb2_queue_is_busy(vdev, file)) 1170 goto exit; 1171 err = vb2_read(vdev->queue, buf, count, ppos, 1172 file->f_flags & O_NONBLOCK); 1173 if (vdev->queue->fileio) 1174 vdev->queue->owner = file->private_data; 1175exit: 1176 if (lock) 1177 mutex_unlock(lock); 1178 return err; 1179} 1180EXPORT_SYMBOL_GPL(vb2_fop_read); 1181 1182__poll_t vb2_fop_poll(struct file *file, poll_table *wait) 1183{ 1184 struct video_device *vdev = video_devdata(file); 1185 struct vb2_queue *q = vdev->queue; 1186 struct mutex *lock = q->lock ? q->lock : vdev->lock; 1187 __poll_t res; 1188 void *fileio; 1189 1190 /* 1191 * If this helper doesn't know how to lock, then you shouldn't be using 1192 * it but you should write your own. 1193 */ 1194 WARN_ON(!lock); 1195 1196 if (lock && mutex_lock_interruptible(lock)) 1197 return EPOLLERR; 1198 1199 fileio = q->fileio; 1200 1201 res = vb2_poll(vdev->queue, file, wait); 1202 1203 /* If fileio was started, then we have a new queue owner. */ 1204 if (!fileio && q->fileio) 1205 q->owner = file->private_data; 1206 if (lock) 1207 mutex_unlock(lock); 1208 return res; 1209} 1210EXPORT_SYMBOL_GPL(vb2_fop_poll); 1211 1212#ifndef CONFIG_MMU 1213unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, 1214 unsigned long len, unsigned long pgoff, unsigned long flags) 1215{ 1216 struct video_device *vdev = video_devdata(file); 1217 1218 return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); 1219} 1220EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); 1221#endif 1222 1223void vb2_video_unregister_device(struct video_device *vdev) 1224{ 1225 /* Check if vdev was ever registered at all */ 1226 if (!vdev || !video_is_registered(vdev)) 1227 return; 1228 1229 /* 1230 * Calling this function only makes sense if vdev->queue is set. 1231 * If it is NULL, then just call video_unregister_device() instead. 1232 */ 1233 WARN_ON(!vdev->queue); 1234 1235 /* 1236 * Take a reference to the device since video_unregister_device() 1237 * calls device_unregister(), but we don't want that to release 1238 * the device since we want to clean up the queue first. 1239 */ 1240 get_device(&vdev->dev); 1241 video_unregister_device(vdev); 1242 if (vdev->queue && vdev->queue->owner) { 1243 struct mutex *lock = vdev->queue->lock ? 1244 vdev->queue->lock : vdev->lock; 1245 1246 if (lock) 1247 mutex_lock(lock); 1248 vb2_queue_release(vdev->queue); 1249 vdev->queue->owner = NULL; 1250 if (lock) 1251 mutex_unlock(lock); 1252 } 1253 /* 1254 * Now we put the device, and in most cases this will release 1255 * everything. 1256 */ 1257 put_device(&vdev->dev); 1258} 1259EXPORT_SYMBOL_GPL(vb2_video_unregister_device); 1260 1261/* vb2_ops helpers. Only use if vq->lock is non-NULL. */ 1262 1263void vb2_ops_wait_prepare(struct vb2_queue *vq) 1264{ 1265 mutex_unlock(vq->lock); 1266} 1267EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); 1268 1269void vb2_ops_wait_finish(struct vb2_queue *vq) 1270{ 1271 mutex_lock(vq->lock); 1272} 1273EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); 1274 1275/* 1276 * Note that this function is called during validation time and 1277 * thus the req_queue_mutex is held to ensure no request objects 1278 * can be added or deleted while validating. So there is no need 1279 * to protect the objects list. 1280 */ 1281int vb2_request_validate(struct media_request *req) 1282{ 1283 struct media_request_object *obj; 1284 int ret = 0; 1285 1286 if (!vb2_request_buffer_cnt(req)) 1287 return -ENOENT; 1288 1289 list_for_each_entry(obj, &req->objects, list) { 1290 if (!obj->ops->prepare) 1291 continue; 1292 1293 ret = obj->ops->prepare(obj); 1294 if (ret) 1295 break; 1296 } 1297 1298 if (ret) { 1299 list_for_each_entry_continue_reverse(obj, &req->objects, list) 1300 if (obj->ops->unprepare) 1301 obj->ops->unprepare(obj); 1302 return ret; 1303 } 1304 return 0; 1305} 1306EXPORT_SYMBOL_GPL(vb2_request_validate); 1307 1308void vb2_request_queue(struct media_request *req) 1309{ 1310 struct media_request_object *obj, *obj_safe; 1311 1312 /* 1313 * Queue all objects. Note that buffer objects are at the end of the 1314 * objects list, after all other object types. Once buffer objects 1315 * are queued, the driver might delete them immediately (if the driver 1316 * processes the buffer at once), so we have to use 1317 * list_for_each_entry_safe() to handle the case where the object we 1318 * queue is deleted. 1319 */ 1320 list_for_each_entry_safe(obj, obj_safe, &req->objects, list) 1321 if (obj->ops->queue) 1322 obj->ops->queue(obj); 1323} 1324EXPORT_SYMBOL_GPL(vb2_request_queue); 1325 1326MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); 1327MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); 1328MODULE_LICENSE("GPL"); 1329