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 36 static int debug; 37 module_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 */ 64 static 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 86 static 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 */ 95 static 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 * __init_vb2_v4l2_buffer() - initialize the vb2_v4l2_buffer struct 134 */ 135 static 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 } 141 142 static 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 * For output buffers copy the timestamp if needed, 151 * and the timecode field and flag if needed. 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 }; 160 161 static 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 } 176 177 static 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 * If the format's field is ALTERNATE, then the buffer's field 193 * should be either TOP or BOTTOM, not ALTERNATE since that 194 * makes no sense. The driver has to know whether the 195 * buffer represents a top or a bottom field in order to 196 * program any DMA correctly. Using ALTERNATE is wrong, since 197 * that just says that it is either a top or a bottom field, 198 * but not which of the two it is. 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 /* Fill in driver-provided information for OUTPUT types */ 236 if (V4L2_TYPE_IS_OUTPUT(b->type)) { 237 /* 238 * Will have to go up to b->length when API starts 239 * accepting variable number of planes. 240 * 241 * If bytesused == 0 for the output buffer, then fall 242 * back to the full buffer size. In that case 243 * userspace clearly never bothered to set it and 244 * it's a safe assumption that they really meant to 245 * use the full plane sizes. 246 * 247 * Some drivers, e.g. old codec drivers, use bytesused == 0 248 * as a way to indicate that streaming is finished. 249 * In that case, the driver should use the 250 * allow_zero_bytesused flag to keep old userspace 251 * applications working. 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 * Single-planar buffers do not use planes array, 271 * so fill in relevant v4l2_buffer struct fields instead. 272 * In videobuf we use our internal V4l2_planes struct for 273 * single-planar buffers as well, for simplicity. 274 * 275 * If bytesused == 0 for the output buffer, then fall back 276 * to the full buffer size as that's a sensible default. 277 * 278 * Some drivers, e.g. old codec drivers, use bytesused == 0 as 279 * a way to indicate that streaming is finished. In that case, 280 * the driver should use the allow_zero_bytesused flag to keep 281 * old userspace applications working. 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 /* Zero flags that we handle */ 314 vbuf->flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS; 315 if (!vb->vb2_queue->copy_timestamp || V4L2_TYPE_IS_CAPTURE(b->type)) { 316 /* 317 * Non-COPY timestamps and non-OUTPUT queues will get 318 * their timestamp and timestamp source flags from the 319 * queue. 320 */ 321 vbuf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; 322 } 323 324 if (V4L2_TYPE_IS_OUTPUT(b->type)) { 325 /* 326 * For output buffers mask out the timecode flag: 327 * this will be handled later in vb2_qbuf(). 328 * The 'field' is valid metadata for this output buffer 329 * and so that needs to be copied here. 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 /* Zero any output buffer flags as this is a capture buffer */ 337 vbuf->flags &= ~V4L2_BUFFER_OUT_FLAGS; 338 /* Zero last flag, this is a signal from driver to userspace */ 339 vbuf->flags &= ~V4L2_BUF_FLAG_LAST; 340 } 341 342 return 0; 343 } 344 345 static void set_buffer_cache_hints(struct vb2_queue *q, 346 struct vb2_buffer *vb, 347 struct v4l2_buffer *b) 348 { 349 /* 350 * DMA exporter should take care of cache syncs, so we can avoid 351 * explicit ->prepare()/->finish() syncs. For other ->memory types 352 * we always need ->prepare() or/and ->finish() cache sync. 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 * Cache sync/invalidation flags are set by default in order to 362 * preserve existing behaviour for old apps/drivers. 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 * Clear buffer cache flags if queue does not support user 370 * space hints. That's to indicate to userspace that these 371 * flags won't work. 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 * ->finish() cache sync can be avoided when queue direction is 380 * TO_DEVICE. 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 } 391 392 static 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 /* Should never happen */ 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 /* Copy relevant information provided by the userspace */ 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 * For proper locking when queueing a request you need to be able 468 * to lock access to the vb2 queue, so check that there is a lock 469 * that we can use. In addition p_req must be non-NULL. 470 */ 471 if (WARN_ON(!q->lock || !p_req)) 472 return -EINVAL; 473 474 /* 475 * Make sure this op is implemented by the driver. It's easy to forget 476 * this callback, but is it important when canceling a buffer in a 477 * queued request. 478 */ 479 if (WARN_ON(!q->ops->buf_request_complete)) 480 return -EINVAL; 481 /* 482 * Make sure this op is implemented by the driver for the output queue. 483 * It's easy to forget this callback, but is it important to correctly 484 * validate the 'field' value at QBUF time. 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 * Early sanity check. This is checked again when the buffer 504 * is bound to the request in vb2_core_qbuf(). 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 * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be 521 * returned to userspace 522 */ 523 static 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 /* Copy back data such as timestamp, flags, etc. */ 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 * Fill in plane-related data if userspace provided an array 547 * for it. The caller has already verified memory and size. 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 * We use length and offset in v4l2_planes array even for 568 * single-planar buffers, but userspace does not. 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 * Clear any buffer state related flags. 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 * For non-COPY timestamps, drop timestamp source bits 588 * and obtain the timestamp source from the queue. 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 /* nothing */ 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 * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a 629 * v4l2_buffer by the userspace. It also verifies that struct 630 * v4l2_buffer has a valid number of planes. 631 */ 632 static 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 } 650 651 static 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 }; 658 659 int 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 } 670 EXPORT_SYMBOL_GPL(vb2_find_timestamp); 671 672 /* 673 * vb2_querybuf() - query video buffer information 674 * @q: videobuf queue 675 * @b: buffer struct passed from userspace to vidioc_querybuf handler 676 * in driver 677 * 678 * Should be called from vidioc_querybuf ioctl handler in driver. 679 * This function will verify the passed v4l2_buffer structure and fill the 680 * relevant information for the userspace. 681 * 682 * The return values from this function are intended to be directly returned 683 * from vidioc_querybuf handler in driver. 684 */ 685 int 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 } 705 EXPORT_SYMBOL(vb2_querybuf); 706 707 static 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 } 725 726 int 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 } 733 EXPORT_SYMBOL_GPL(vb2_reqbufs); 734 735 int 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 } 752 EXPORT_SYMBOL_GPL(vb2_prepare_buf); 753 754 int 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 } 810 EXPORT_SYMBOL_GPL(vb2_create_bufs); 811 812 int 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 } 831 EXPORT_SYMBOL_GPL(vb2_qbuf); 832 833 int 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 * After calling the VIDIOC_DQBUF V4L2_BUF_FLAG_DONE must be 856 * cleared. 857 */ 858 b->flags &= ~V4L2_BUF_FLAG_DONE; 859 860 return ret; 861 } 862 EXPORT_SYMBOL_GPL(vb2_dqbuf); 863 864 int 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 } 872 EXPORT_SYMBOL_GPL(vb2_streamon); 873 874 int 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 } 882 EXPORT_SYMBOL_GPL(vb2_streamoff); 883 884 int 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 } 889 EXPORT_SYMBOL_GPL(vb2_expbuf); 890 891 int vb2_queue_init_name(struct vb2_queue *q, const char *name) 892 { 893 /* 894 * Sanity check 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 /* Warn that the driver should choose an appropriate timestamp type */ 903 WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == 904 V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); 905 906 /* Warn that vb2_memory should match with v4l2_memory */ 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 * For compatibility with vb1: if QBUF hasn't been called yet, then 922 * return EPOLLERR as well. This only affects capture queues, output 923 * queues will always initialize waiting_for_buffers to false. 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 } 934 EXPORT_SYMBOL_GPL(vb2_queue_init_name); 935 936 int vb2_queue_init(struct vb2_queue *q) 937 { 938 return vb2_queue_init_name(q, NULL); 939 } 940 EXPORT_SYMBOL_GPL(vb2_queue_init); 941 942 void vb2_queue_release(struct vb2_queue *q) 943 { 944 vb2_core_queue_release(q); 945 } 946 EXPORT_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 } 965 EXPORT_SYMBOL_GPL(vb2_poll); 966 967 /* 968 * The following functions are not part of the vb2 core API, but are helper 969 * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations 970 * and struct vb2_ops. 971 * They contain boilerplate code that most if not all drivers have to do 972 * and so they simplify the driver code. 973 */ 974 975 /* The queue is busy if there is a owner and you are not that owner. */ 976 static 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 /* vb2 ioctl helpers */ 982 983 int 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 /* If count == 0, then the owner has released all buffers and he 996 is no longer owner of the queue. Otherwise we have a new owner. */ 997 if (res == 0) 998 vdev->queue->owner = p->count ? file->private_data : NULL; 999 return res; 1000 } 1001 EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); 1002 1003 int 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 * If count == 0, then just check if memory and type are valid. 1014 * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0. 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 } 1028 EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); 1029 1030 int 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 } 1039 EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); 1040 1041 int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) 1042 { 1043 struct video_device *vdev = video_devdata(file); 1044 1045 /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ 1046 return vb2_querybuf(vdev->queue, p); 1047 } 1048 EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); 1049 1050 int 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 } 1058 EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); 1059 1060 int 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 } 1068 EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); 1069 1070 int 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 } 1078 EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); 1079 1080 int 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 } 1088 EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); 1089 1090 int 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 } 1098 EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); 1099 1100 /* v4l2_file_operations helpers */ 1101 1102 int 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 } 1108 EXPORT_SYMBOL_GPL(vb2_fop_mmap); 1109 1110 int _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 } 1124 EXPORT_SYMBOL_GPL(_vb2_fop_release); 1125 1126 int 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 } 1133 EXPORT_SYMBOL_GPL(vb2_fop_release); 1134 1135 ssize_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; 1152 exit: 1153 if (lock) 1154 mutex_unlock(lock); 1155 return err; 1156 } 1157 EXPORT_SYMBOL_GPL(vb2_fop_write); 1158 1159 ssize_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; 1176 exit: 1177 if (lock) 1178 mutex_unlock(lock); 1179 return err; 1180 } 1181 EXPORT_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 * If this helper doesn't know how to lock, then you shouldn't be using 1193 * it but you should write your own. 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 /* If fileio was started, then we have a new queue owner. */ 1205 if (!fileio && q->fileio) 1206 q->owner = file->private_data; 1207 if (lock) 1208 mutex_unlock(lock); 1209 return res; 1210 } 1211 EXPORT_SYMBOL_GPL(vb2_fop_poll); 1212 1213 #ifndef CONFIG_MMU 1214 unsigned 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 } 1221 EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); 1222 #endif 1223 1224 void vb2_video_unregister_device(struct video_device *vdev) 1225 { 1226 /* Check if vdev was ever registered at all */ 1227 if (!vdev || !video_is_registered(vdev)) 1228 return; 1229 1230 /* 1231 * Calling this function only makes sense if vdev->queue is set. 1232 * If it is NULL, then just call video_unregister_device() instead. 1233 */ 1234 WARN_ON(!vdev->queue); 1235 1236 /* 1237 * Take a reference to the device since video_unregister_device() 1238 * calls device_unregister(), but we don't want that to release 1239 * the device since we want to clean up the queue first. 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 * Now we put the device, and in most cases this will release 1256 * everything. 1257 */ 1258 put_device(&vdev->dev); 1259 } 1260 EXPORT_SYMBOL_GPL(vb2_video_unregister_device); 1261 1262 /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ 1263 1264 void vb2_ops_wait_prepare(struct vb2_queue *vq) 1265 { 1266 mutex_unlock(vq->lock); 1267 } 1268 EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); 1269 1270 void vb2_ops_wait_finish(struct vb2_queue *vq) 1271 { 1272 mutex_lock(vq->lock); 1273 } 1274 EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); 1275 1276 /* 1277 * Note that this function is called during validation time and 1278 * thus the req_queue_mutex is held to ensure no request objects 1279 * can be added or deleted while validating. So there is no need 1280 * to protect the objects list. 1281 */ 1282 int 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 } 1307 EXPORT_SYMBOL_GPL(vb2_request_validate); 1308 1309 void vb2_request_queue(struct media_request *req) 1310 { 1311 struct media_request_object *obj, *obj_safe; 1312 1313 /* 1314 * Queue all objects. Note that buffer objects are at the end of the 1315 * objects list, after all other object types. Once buffer objects 1316 * are queued, the driver might delete them immediately (if the driver 1317 * processes the buffer at once), so we have to use 1318 * list_for_each_entry_safe() to handle the case where the object we 1319 * queue is deleted. 1320 */ 1321 list_for_each_entry_safe(obj, obj_safe, &req->objects, list) 1322 if (obj->ops->queue) 1323 obj->ops->queue(obj); 1324 } 1325 EXPORT_SYMBOL_GPL(vb2_request_queue); 1326 1327 MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); 1328 MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); 1329 MODULE_LICENSE("GPL"); 1330