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->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 */ 134 static 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 } 140 141 static 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 }; 159 160 static 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 } 175 176 static 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 } 343 344 static 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 user 351 * space hints. That's to indicate to userspace that these 352 * 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 } 365 366 static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *mdev, 367 struct v4l2_buffer *b, bool is_prepare, 368 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 struct vb2_buffer *vb; 374 int ret; 375 376 if (b->type != q->type) { 377 dprintk(q, 1, "%s: invalid buffer type\n", opname); 378 return -EINVAL; 379 } 380 381 if (b->index >= q->num_buffers) { 382 dprintk(q, 1, "%s: buffer index out of range\n", opname); 383 return -EINVAL; 384 } 385 386 if (q->bufs[b->index] == NULL) { 387 /* Should never happen */ 388 dprintk(q, 1, "%s: buffer is NULL\n", opname); 389 return -EINVAL; 390 } 391 392 if (b->memory != q->memory) { 393 dprintk(q, 1, "%s: invalid memory type\n", opname); 394 return -EINVAL; 395 } 396 397 vb = q->bufs[b->index]; 398 vbuf = to_vb2_v4l2_buffer(vb); 399 ret = __verify_planes_array(vb, b); 400 if (ret) 401 return ret; 402 403 if (!is_prepare && (b->flags & V4L2_BUF_FLAG_REQUEST_FD) && 404 vb->state != VB2_BUF_STATE_DEQUEUED) { 405 dprintk(q, 1, "%s: buffer is not in dequeued state\n", opname); 406 return -EINVAL; 407 } 408 409 if (!vb->prepared) { 410 set_buffer_cache_hints(q, vb, b); 411 /* Copy relevant information provided by the userspace */ 412 memset(vbuf->planes, 0, 413 sizeof(vbuf->planes[0]) * vb->num_planes); 414 ret = vb2_fill_vb2_v4l2_buffer(vb, b); 415 if (ret) 416 return ret; 417 } 418 419 if (is_prepare) 420 return 0; 421 422 if (!(b->flags & V4L2_BUF_FLAG_REQUEST_FD)) { 423 if (q->requires_requests) { 424 dprintk(q, 1, "%s: queue requires requests\n", opname); 425 return -EBADR; 426 } 427 if (q->uses_requests) { 428 dprintk(q, 1, "%s: queue uses requests\n", opname); 429 return -EBUSY; 430 } 431 return 0; 432 } else if (!q->supports_requests) { 433 dprintk(q, 1, "%s: queue does not support requests\n", opname); 434 return -EBADR; 435 } else if (q->uses_qbuf) { 436 dprintk(q, 1, "%s: queue does not use requests\n", opname); 437 return -EBUSY; 438 } 439 440 /* 441 * For proper locking when queueing a request you need to be able 442 * to lock access to the vb2 queue, so check that there is a lock 443 * that we can use. In addition p_req must be non-NULL. 444 */ 445 if (WARN_ON(!q->lock || !p_req)) 446 return -EINVAL; 447 448 /* 449 * Make sure this op is implemented by the driver. It's easy to forget 450 * this callback, but is it important when canceling a buffer in a 451 * queued request. 452 */ 453 if (WARN_ON(!q->ops->buf_request_complete)) 454 return -EINVAL; 455 /* 456 * Make sure this op is implemented by the driver for the output queue. 457 * It's easy to forget this callback, but is it important to correctly 458 * validate the 'field' value at QBUF time. 459 */ 460 if (WARN_ON((q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT || 461 q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) && 462 !q->ops->buf_out_validate)) 463 return -EINVAL; 464 465 req = media_request_get_by_fd(mdev, b->request_fd); 466 if (IS_ERR(req)) { 467 dprintk(q, 1, "%s: invalid request_fd\n", opname); 468 return PTR_ERR(req); 469 } 470 471 /* 472 * Early sanity check. This is checked again when the buffer 473 * is bound to the request in vb2_core_qbuf(). 474 */ 475 if (req->state != MEDIA_REQUEST_STATE_IDLE && 476 req->state != MEDIA_REQUEST_STATE_UPDATING) { 477 dprintk(q, 1, "%s: request is not idle\n", opname); 478 media_request_put(req); 479 return -EBUSY; 480 } 481 482 *p_req = req; 483 vbuf->request_fd = b->request_fd; 484 485 return 0; 486 } 487 488 /* 489 * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be 490 * returned to userspace 491 */ 492 static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb) 493 { 494 struct v4l2_buffer *b = pb; 495 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 496 struct vb2_queue *q = vb->vb2_queue; 497 unsigned int plane; 498 499 /* Copy back data such as timestamp, flags, etc. */ 500 b->index = vb->index; 501 b->type = vb->type; 502 b->memory = vb->memory; 503 b->bytesused = 0; 504 505 b->flags = vbuf->flags; 506 b->field = vbuf->field; 507 v4l2_buffer_set_timestamp(b, vb->timestamp); 508 b->timecode = vbuf->timecode; 509 b->sequence = vbuf->sequence; 510 b->reserved2 = 0; 511 b->request_fd = 0; 512 513 if (q->is_multiplanar) { 514 /* 515 * Fill in plane-related data if userspace provided an array 516 * for it. The caller has already verified memory and size. 517 */ 518 b->length = vb->num_planes; 519 for (plane = 0; plane < vb->num_planes; ++plane) { 520 struct v4l2_plane *pdst = &b->m.planes[plane]; 521 struct vb2_plane *psrc = &vb->planes[plane]; 522 523 pdst->bytesused = psrc->bytesused; 524 pdst->length = psrc->length; 525 if (q->memory == VB2_MEMORY_MMAP) 526 pdst->m.mem_offset = psrc->m.offset; 527 else if (q->memory == VB2_MEMORY_USERPTR) 528 pdst->m.userptr = psrc->m.userptr; 529 else if (q->memory == VB2_MEMORY_DMABUF) 530 pdst->m.fd = psrc->m.fd; 531 pdst->data_offset = psrc->data_offset; 532 memset(pdst->reserved, 0, sizeof(pdst->reserved)); 533 } 534 } else { 535 /* 536 * We use length and offset in v4l2_planes array even for 537 * single-planar buffers, but userspace does not. 538 */ 539 b->length = vb->planes[0].length; 540 b->bytesused = vb->planes[0].bytesused; 541 if (q->memory == VB2_MEMORY_MMAP) 542 b->m.offset = vb->planes[0].m.offset; 543 else if (q->memory == VB2_MEMORY_USERPTR) 544 b->m.userptr = vb->planes[0].m.userptr; 545 else if (q->memory == VB2_MEMORY_DMABUF) 546 b->m.fd = vb->planes[0].m.fd; 547 } 548 549 /* 550 * Clear any buffer state related flags. 551 */ 552 b->flags &= ~V4L2_BUFFER_MASK_FLAGS; 553 b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK; 554 if (!q->copy_timestamp) { 555 /* 556 * For non-COPY timestamps, drop timestamp source bits 557 * and obtain the timestamp source from the queue. 558 */ 559 b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; 560 b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK; 561 } 562 563 switch (vb->state) { 564 case VB2_BUF_STATE_QUEUED: 565 case VB2_BUF_STATE_ACTIVE: 566 b->flags |= V4L2_BUF_FLAG_QUEUED; 567 break; 568 case VB2_BUF_STATE_IN_REQUEST: 569 b->flags |= V4L2_BUF_FLAG_IN_REQUEST; 570 break; 571 case VB2_BUF_STATE_ERROR: 572 b->flags |= V4L2_BUF_FLAG_ERROR; 573 fallthrough; 574 case VB2_BUF_STATE_DONE: 575 b->flags |= V4L2_BUF_FLAG_DONE; 576 break; 577 case VB2_BUF_STATE_PREPARING: 578 case VB2_BUF_STATE_DEQUEUED: 579 /* nothing */ 580 break; 581 } 582 583 if ((vb->state == VB2_BUF_STATE_DEQUEUED || 584 vb->state == VB2_BUF_STATE_IN_REQUEST) && 585 vb->synced && vb->prepared) 586 b->flags |= V4L2_BUF_FLAG_PREPARED; 587 588 if (vb2_buffer_in_use(q, vb)) 589 b->flags |= V4L2_BUF_FLAG_MAPPED; 590 if (vbuf->request_fd >= 0) { 591 b->flags |= V4L2_BUF_FLAG_REQUEST_FD; 592 b->request_fd = vbuf->request_fd; 593 } 594 } 595 596 /* 597 * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a 598 * v4l2_buffer by the userspace. It also verifies that struct 599 * v4l2_buffer has a valid number of planes. 600 */ 601 static int __fill_vb2_buffer(struct vb2_buffer *vb, struct vb2_plane *planes) 602 { 603 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 604 unsigned int plane; 605 606 if (!vb->vb2_queue->copy_timestamp) 607 vb->timestamp = 0; 608 609 for (plane = 0; plane < vb->num_planes; ++plane) { 610 if (vb->vb2_queue->memory != VB2_MEMORY_MMAP) { 611 planes[plane].m = vbuf->planes[plane].m; 612 planes[plane].length = vbuf->planes[plane].length; 613 } 614 planes[plane].bytesused = vbuf->planes[plane].bytesused; 615 planes[plane].data_offset = vbuf->planes[plane].data_offset; 616 } 617 return 0; 618 } 619 620 static const struct vb2_buf_ops v4l2_buf_ops = { 621 .verify_planes_array = __verify_planes_array_core, 622 .init_buffer = __init_vb2_v4l2_buffer, 623 .fill_user_buffer = __fill_v4l2_buffer, 624 .fill_vb2_buffer = __fill_vb2_buffer, 625 .copy_timestamp = __copy_timestamp, 626 }; 627 628 int vb2_find_timestamp(const struct vb2_queue *q, u64 timestamp, 629 unsigned int start_idx) 630 { 631 unsigned int i; 632 633 for (i = start_idx; i < q->num_buffers; i++) 634 if (q->bufs[i]->copied_timestamp && 635 q->bufs[i]->timestamp == timestamp) 636 return i; 637 return -1; 638 } 639 EXPORT_SYMBOL_GPL(vb2_find_timestamp); 640 641 struct vb2_buffer *vb2_find_buffer(struct vb2_queue *q, u64 timestamp) 642 { 643 unsigned int i; 644 645 for (i = 0; i < q->num_buffers; i++) 646 if (q->bufs[i]->copied_timestamp && 647 q->bufs[i]->timestamp == timestamp) 648 return vb2_get_buffer(q, i); 649 return NULL; 650 } 651 EXPORT_SYMBOL_GPL(vb2_find_buffer); 652 653 /* 654 * vb2_querybuf() - query video buffer information 655 * @q: videobuf queue 656 * @b: buffer struct passed from userspace to vidioc_querybuf handler 657 * in driver 658 * 659 * Should be called from vidioc_querybuf ioctl handler in driver. 660 * This function will verify the passed v4l2_buffer structure and fill the 661 * relevant information for the userspace. 662 * 663 * The return values from this function are intended to be directly returned 664 * from vidioc_querybuf handler in driver. 665 */ 666 int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) 667 { 668 struct vb2_buffer *vb; 669 int ret; 670 671 if (b->type != q->type) { 672 dprintk(q, 1, "wrong buffer type\n"); 673 return -EINVAL; 674 } 675 676 if (b->index >= q->num_buffers) { 677 dprintk(q, 1, "buffer index out of range\n"); 678 return -EINVAL; 679 } 680 vb = q->bufs[b->index]; 681 ret = __verify_planes_array(vb, b); 682 if (!ret) 683 vb2_core_querybuf(q, b->index, b); 684 return ret; 685 } 686 EXPORT_SYMBOL(vb2_querybuf); 687 688 static void fill_buf_caps(struct vb2_queue *q, u32 *caps) 689 { 690 *caps = V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS; 691 if (q->io_modes & VB2_MMAP) 692 *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP; 693 if (q->io_modes & VB2_USERPTR) 694 *caps |= V4L2_BUF_CAP_SUPPORTS_USERPTR; 695 if (q->io_modes & VB2_DMABUF) 696 *caps |= V4L2_BUF_CAP_SUPPORTS_DMABUF; 697 if (q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF) 698 *caps |= V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF; 699 if (q->allow_cache_hints && q->io_modes & VB2_MMAP) 700 *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS; 701 #ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API 702 if (q->supports_requests) 703 *caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS; 704 #endif 705 } 706 707 static void validate_memory_flags(struct vb2_queue *q, 708 int memory, 709 u32 *flags) 710 { 711 if (!q->allow_cache_hints || memory != V4L2_MEMORY_MMAP) { 712 /* 713 * This needs to clear V4L2_MEMORY_FLAG_NON_COHERENT only, 714 * but in order to avoid bugs we zero out all bits. 715 */ 716 *flags = 0; 717 } else { 718 /* Clear all unknown flags. */ 719 *flags &= V4L2_MEMORY_FLAG_NON_COHERENT; 720 } 721 } 722 723 int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) 724 { 725 int ret = vb2_verify_memory_type(q, req->memory, req->type); 726 u32 flags = req->flags; 727 728 fill_buf_caps(q, &req->capabilities); 729 validate_memory_flags(q, req->memory, &flags); 730 req->flags = flags; 731 return ret ? ret : vb2_core_reqbufs(q, req->memory, 732 req->flags, &req->count); 733 } 734 EXPORT_SYMBOL_GPL(vb2_reqbufs); 735 736 int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev, 737 struct v4l2_buffer *b) 738 { 739 int ret; 740 741 if (vb2_fileio_is_active(q)) { 742 dprintk(q, 1, "file io in progress\n"); 743 return -EBUSY; 744 } 745 746 if (b->flags & V4L2_BUF_FLAG_REQUEST_FD) 747 return -EINVAL; 748 749 ret = vb2_queue_or_prepare_buf(q, mdev, b, true, NULL); 750 751 return ret ? ret : vb2_core_prepare_buf(q, b->index, b); 752 } 753 EXPORT_SYMBOL_GPL(vb2_prepare_buf); 754 755 int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) 756 { 757 unsigned requested_planes = 1; 758 unsigned requested_sizes[VIDEO_MAX_PLANES]; 759 struct v4l2_format *f = &create->format; 760 int ret = vb2_verify_memory_type(q, create->memory, f->type); 761 unsigned i; 762 763 fill_buf_caps(q, &create->capabilities); 764 validate_memory_flags(q, create->memory, &create->flags); 765 create->index = q->num_buffers; 766 if (create->count == 0) 767 return ret != -EBUSY ? ret : 0; 768 769 switch (f->type) { 770 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE: 771 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE: 772 requested_planes = f->fmt.pix_mp.num_planes; 773 if (requested_planes == 0 || 774 requested_planes > VIDEO_MAX_PLANES) 775 return -EINVAL; 776 for (i = 0; i < requested_planes; i++) 777 requested_sizes[i] = 778 f->fmt.pix_mp.plane_fmt[i].sizeimage; 779 break; 780 case V4L2_BUF_TYPE_VIDEO_CAPTURE: 781 case V4L2_BUF_TYPE_VIDEO_OUTPUT: 782 requested_sizes[0] = f->fmt.pix.sizeimage; 783 break; 784 case V4L2_BUF_TYPE_VBI_CAPTURE: 785 case V4L2_BUF_TYPE_VBI_OUTPUT: 786 requested_sizes[0] = f->fmt.vbi.samples_per_line * 787 (f->fmt.vbi.count[0] + f->fmt.vbi.count[1]); 788 break; 789 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE: 790 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: 791 requested_sizes[0] = f->fmt.sliced.io_size; 792 break; 793 case V4L2_BUF_TYPE_SDR_CAPTURE: 794 case V4L2_BUF_TYPE_SDR_OUTPUT: 795 requested_sizes[0] = f->fmt.sdr.buffersize; 796 break; 797 case V4L2_BUF_TYPE_META_CAPTURE: 798 case V4L2_BUF_TYPE_META_OUTPUT: 799 requested_sizes[0] = f->fmt.meta.buffersize; 800 break; 801 default: 802 return -EINVAL; 803 } 804 for (i = 0; i < requested_planes; i++) 805 if (requested_sizes[i] == 0) 806 return -EINVAL; 807 return ret ? ret : vb2_core_create_bufs(q, create->memory, 808 create->flags, 809 &create->count, 810 requested_planes, 811 requested_sizes); 812 } 813 EXPORT_SYMBOL_GPL(vb2_create_bufs); 814 815 int vb2_qbuf(struct vb2_queue *q, struct media_device *mdev, 816 struct v4l2_buffer *b) 817 { 818 struct media_request *req = NULL; 819 int ret; 820 821 if (vb2_fileio_is_active(q)) { 822 dprintk(q, 1, "file io in progress\n"); 823 return -EBUSY; 824 } 825 826 ret = vb2_queue_or_prepare_buf(q, mdev, b, false, &req); 827 if (ret) 828 return ret; 829 ret = vb2_core_qbuf(q, b->index, b, req); 830 if (req) 831 media_request_put(req); 832 return ret; 833 } 834 EXPORT_SYMBOL_GPL(vb2_qbuf); 835 836 int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) 837 { 838 int ret; 839 840 if (vb2_fileio_is_active(q)) { 841 dprintk(q, 1, "file io in progress\n"); 842 return -EBUSY; 843 } 844 845 if (b->type != q->type) { 846 dprintk(q, 1, "invalid buffer type\n"); 847 return -EINVAL; 848 } 849 850 ret = vb2_core_dqbuf(q, NULL, b, nonblocking); 851 852 if (!q->is_output && 853 b->flags & V4L2_BUF_FLAG_DONE && 854 b->flags & V4L2_BUF_FLAG_LAST) 855 q->last_buffer_dequeued = true; 856 857 /* 858 * After calling the VIDIOC_DQBUF V4L2_BUF_FLAG_DONE must be 859 * cleared. 860 */ 861 b->flags &= ~V4L2_BUF_FLAG_DONE; 862 863 return ret; 864 } 865 EXPORT_SYMBOL_GPL(vb2_dqbuf); 866 867 int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) 868 { 869 if (vb2_fileio_is_active(q)) { 870 dprintk(q, 1, "file io in progress\n"); 871 return -EBUSY; 872 } 873 return vb2_core_streamon(q, type); 874 } 875 EXPORT_SYMBOL_GPL(vb2_streamon); 876 877 int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) 878 { 879 if (vb2_fileio_is_active(q)) { 880 dprintk(q, 1, "file io in progress\n"); 881 return -EBUSY; 882 } 883 return vb2_core_streamoff(q, type); 884 } 885 EXPORT_SYMBOL_GPL(vb2_streamoff); 886 887 int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb) 888 { 889 return vb2_core_expbuf(q, &eb->fd, eb->type, eb->index, 890 eb->plane, eb->flags); 891 } 892 EXPORT_SYMBOL_GPL(vb2_expbuf); 893 894 int vb2_queue_init_name(struct vb2_queue *q, const char *name) 895 { 896 /* 897 * Sanity check 898 */ 899 if (WARN_ON(!q) || 900 WARN_ON(q->timestamp_flags & 901 ~(V4L2_BUF_FLAG_TIMESTAMP_MASK | 902 V4L2_BUF_FLAG_TSTAMP_SRC_MASK))) 903 return -EINVAL; 904 905 /* Warn that the driver should choose an appropriate timestamp type */ 906 WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == 907 V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); 908 909 /* Warn that vb2_memory should match with v4l2_memory */ 910 if (WARN_ON(VB2_MEMORY_MMAP != (int)V4L2_MEMORY_MMAP) 911 || WARN_ON(VB2_MEMORY_USERPTR != (int)V4L2_MEMORY_USERPTR) 912 || WARN_ON(VB2_MEMORY_DMABUF != (int)V4L2_MEMORY_DMABUF)) 913 return -EINVAL; 914 915 if (q->buf_struct_size == 0) 916 q->buf_struct_size = sizeof(struct vb2_v4l2_buffer); 917 918 q->buf_ops = &v4l2_buf_ops; 919 q->is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); 920 q->is_output = V4L2_TYPE_IS_OUTPUT(q->type); 921 q->copy_timestamp = (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) 922 == V4L2_BUF_FLAG_TIMESTAMP_COPY; 923 /* 924 * For compatibility with vb1: if QBUF hasn't been called yet, then 925 * return EPOLLERR as well. This only affects capture queues, output 926 * queues will always initialize waiting_for_buffers to false. 927 */ 928 q->quirk_poll_must_check_waiting_for_buffers = true; 929 930 if (name) 931 strscpy(q->name, name, sizeof(q->name)); 932 else 933 q->name[0] = '\0'; 934 935 return vb2_core_queue_init(q); 936 } 937 EXPORT_SYMBOL_GPL(vb2_queue_init_name); 938 939 int vb2_queue_init(struct vb2_queue *q) 940 { 941 return vb2_queue_init_name(q, NULL); 942 } 943 EXPORT_SYMBOL_GPL(vb2_queue_init); 944 945 void vb2_queue_release(struct vb2_queue *q) 946 { 947 vb2_core_queue_release(q); 948 } 949 EXPORT_SYMBOL_GPL(vb2_queue_release); 950 951 int vb2_queue_change_type(struct vb2_queue *q, unsigned int type) 952 { 953 if (type == q->type) 954 return 0; 955 956 if (vb2_is_busy(q)) 957 return -EBUSY; 958 959 q->type = type; 960 961 return 0; 962 } 963 EXPORT_SYMBOL_GPL(vb2_queue_change_type); 964 965 __poll_t vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) 966 { 967 struct video_device *vfd = video_devdata(file); 968 __poll_t res; 969 970 res = vb2_core_poll(q, file, wait); 971 972 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { 973 struct v4l2_fh *fh = file->private_data; 974 975 poll_wait(file, &fh->wait, wait); 976 if (v4l2_event_pending(fh)) 977 res |= EPOLLPRI; 978 } 979 980 return res; 981 } 982 EXPORT_SYMBOL_GPL(vb2_poll); 983 984 /* 985 * The following functions are not part of the vb2 core API, but are helper 986 * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations 987 * and struct vb2_ops. 988 * They contain boilerplate code that most if not all drivers have to do 989 * and so they simplify the driver code. 990 */ 991 992 /* vb2 ioctl helpers */ 993 994 int vb2_ioctl_reqbufs(struct file *file, void *priv, 995 struct v4l2_requestbuffers *p) 996 { 997 struct video_device *vdev = video_devdata(file); 998 int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type); 999 u32 flags = p->flags; 1000 1001 fill_buf_caps(vdev->queue, &p->capabilities); 1002 validate_memory_flags(vdev->queue, p->memory, &flags); 1003 p->flags = flags; 1004 if (res) 1005 return res; 1006 if (vb2_queue_is_busy(vdev->queue, file)) 1007 return -EBUSY; 1008 res = vb2_core_reqbufs(vdev->queue, p->memory, p->flags, &p->count); 1009 /* If count == 0, then the owner has released all buffers and he 1010 is no longer owner of the queue. Otherwise we have a new owner. */ 1011 if (res == 0) 1012 vdev->queue->owner = p->count ? file->private_data : NULL; 1013 return res; 1014 } 1015 EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); 1016 1017 int vb2_ioctl_create_bufs(struct file *file, void *priv, 1018 struct v4l2_create_buffers *p) 1019 { 1020 struct video_device *vdev = video_devdata(file); 1021 int res = vb2_verify_memory_type(vdev->queue, p->memory, 1022 p->format.type); 1023 1024 p->index = vdev->queue->num_buffers; 1025 fill_buf_caps(vdev->queue, &p->capabilities); 1026 validate_memory_flags(vdev->queue, p->memory, &p->flags); 1027 /* 1028 * If count == 0, then just check if memory and type are valid. 1029 * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0. 1030 */ 1031 if (p->count == 0) 1032 return res != -EBUSY ? res : 0; 1033 if (res) 1034 return res; 1035 if (vb2_queue_is_busy(vdev->queue, file)) 1036 return -EBUSY; 1037 1038 res = vb2_create_bufs(vdev->queue, p); 1039 if (res == 0) 1040 vdev->queue->owner = file->private_data; 1041 return res; 1042 } 1043 EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); 1044 1045 int vb2_ioctl_prepare_buf(struct file *file, void *priv, 1046 struct v4l2_buffer *p) 1047 { 1048 struct video_device *vdev = video_devdata(file); 1049 1050 if (vb2_queue_is_busy(vdev->queue, file)) 1051 return -EBUSY; 1052 return vb2_prepare_buf(vdev->queue, vdev->v4l2_dev->mdev, p); 1053 } 1054 EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); 1055 1056 int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) 1057 { 1058 struct video_device *vdev = video_devdata(file); 1059 1060 /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ 1061 return vb2_querybuf(vdev->queue, p); 1062 } 1063 EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); 1064 1065 int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) 1066 { 1067 struct video_device *vdev = video_devdata(file); 1068 1069 if (vb2_queue_is_busy(vdev->queue, file)) 1070 return -EBUSY; 1071 return vb2_qbuf(vdev->queue, vdev->v4l2_dev->mdev, p); 1072 } 1073 EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); 1074 1075 int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) 1076 { 1077 struct video_device *vdev = video_devdata(file); 1078 1079 if (vb2_queue_is_busy(vdev->queue, file)) 1080 return -EBUSY; 1081 return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); 1082 } 1083 EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); 1084 1085 int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) 1086 { 1087 struct video_device *vdev = video_devdata(file); 1088 1089 if (vb2_queue_is_busy(vdev->queue, file)) 1090 return -EBUSY; 1091 return vb2_streamon(vdev->queue, i); 1092 } 1093 EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); 1094 1095 int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) 1096 { 1097 struct video_device *vdev = video_devdata(file); 1098 1099 if (vb2_queue_is_busy(vdev->queue, file)) 1100 return -EBUSY; 1101 return vb2_streamoff(vdev->queue, i); 1102 } 1103 EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); 1104 1105 int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) 1106 { 1107 struct video_device *vdev = video_devdata(file); 1108 1109 if (vb2_queue_is_busy(vdev->queue, file)) 1110 return -EBUSY; 1111 return vb2_expbuf(vdev->queue, p); 1112 } 1113 EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); 1114 1115 /* v4l2_file_operations helpers */ 1116 1117 int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) 1118 { 1119 struct video_device *vdev = video_devdata(file); 1120 1121 return vb2_mmap(vdev->queue, vma); 1122 } 1123 EXPORT_SYMBOL_GPL(vb2_fop_mmap); 1124 1125 int _vb2_fop_release(struct file *file, struct mutex *lock) 1126 { 1127 struct video_device *vdev = video_devdata(file); 1128 1129 if (lock) 1130 mutex_lock(lock); 1131 if (file->private_data == vdev->queue->owner) { 1132 vb2_queue_release(vdev->queue); 1133 vdev->queue->owner = NULL; 1134 } 1135 if (lock) 1136 mutex_unlock(lock); 1137 return v4l2_fh_release(file); 1138 } 1139 EXPORT_SYMBOL_GPL(_vb2_fop_release); 1140 1141 int vb2_fop_release(struct file *file) 1142 { 1143 struct video_device *vdev = video_devdata(file); 1144 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; 1145 1146 return _vb2_fop_release(file, lock); 1147 } 1148 EXPORT_SYMBOL_GPL(vb2_fop_release); 1149 1150 ssize_t vb2_fop_write(struct file *file, const char __user *buf, 1151 size_t count, loff_t *ppos) 1152 { 1153 struct video_device *vdev = video_devdata(file); 1154 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; 1155 int err = -EBUSY; 1156 1157 if (!(vdev->queue->io_modes & VB2_WRITE)) 1158 return -EINVAL; 1159 if (lock && mutex_lock_interruptible(lock)) 1160 return -ERESTARTSYS; 1161 if (vb2_queue_is_busy(vdev->queue, file)) 1162 goto exit; 1163 err = vb2_write(vdev->queue, buf, count, ppos, 1164 file->f_flags & O_NONBLOCK); 1165 if (vdev->queue->fileio) 1166 vdev->queue->owner = file->private_data; 1167 exit: 1168 if (lock) 1169 mutex_unlock(lock); 1170 return err; 1171 } 1172 EXPORT_SYMBOL_GPL(vb2_fop_write); 1173 1174 ssize_t vb2_fop_read(struct file *file, char __user *buf, 1175 size_t count, loff_t *ppos) 1176 { 1177 struct video_device *vdev = video_devdata(file); 1178 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; 1179 int err = -EBUSY; 1180 1181 if (!(vdev->queue->io_modes & VB2_READ)) 1182 return -EINVAL; 1183 if (lock && mutex_lock_interruptible(lock)) 1184 return -ERESTARTSYS; 1185 if (vb2_queue_is_busy(vdev->queue, file)) 1186 goto exit; 1187 err = vb2_read(vdev->queue, buf, count, ppos, 1188 file->f_flags & O_NONBLOCK); 1189 if (vdev->queue->fileio) 1190 vdev->queue->owner = file->private_data; 1191 exit: 1192 if (lock) 1193 mutex_unlock(lock); 1194 return err; 1195 } 1196 EXPORT_SYMBOL_GPL(vb2_fop_read); 1197 1198 __poll_t vb2_fop_poll(struct file *file, poll_table *wait) 1199 { 1200 struct video_device *vdev = video_devdata(file); 1201 struct vb2_queue *q = vdev->queue; 1202 struct mutex *lock = q->lock ? q->lock : vdev->lock; 1203 __poll_t res; 1204 void *fileio; 1205 1206 /* 1207 * If this helper doesn't know how to lock, then you shouldn't be using 1208 * it but you should write your own. 1209 */ 1210 WARN_ON(!lock); 1211 1212 if (lock && mutex_lock_interruptible(lock)) 1213 return EPOLLERR; 1214 1215 fileio = q->fileio; 1216 1217 res = vb2_poll(vdev->queue, file, wait); 1218 1219 /* If fileio was started, then we have a new queue owner. */ 1220 if (!fileio && q->fileio) 1221 q->owner = file->private_data; 1222 if (lock) 1223 mutex_unlock(lock); 1224 return res; 1225 } 1226 EXPORT_SYMBOL_GPL(vb2_fop_poll); 1227 1228 #ifndef CONFIG_MMU 1229 unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, 1230 unsigned long len, unsigned long pgoff, unsigned long flags) 1231 { 1232 struct video_device *vdev = video_devdata(file); 1233 1234 return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); 1235 } 1236 EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); 1237 #endif 1238 1239 void vb2_video_unregister_device(struct video_device *vdev) 1240 { 1241 /* Check if vdev was ever registered at all */ 1242 if (!vdev || !video_is_registered(vdev)) 1243 return; 1244 1245 /* 1246 * Calling this function only makes sense if vdev->queue is set. 1247 * If it is NULL, then just call video_unregister_device() instead. 1248 */ 1249 WARN_ON(!vdev->queue); 1250 1251 /* 1252 * Take a reference to the device since video_unregister_device() 1253 * calls device_unregister(), but we don't want that to release 1254 * the device since we want to clean up the queue first. 1255 */ 1256 get_device(&vdev->dev); 1257 video_unregister_device(vdev); 1258 if (vdev->queue && vdev->queue->owner) { 1259 struct mutex *lock = vdev->queue->lock ? 1260 vdev->queue->lock : vdev->lock; 1261 1262 if (lock) 1263 mutex_lock(lock); 1264 vb2_queue_release(vdev->queue); 1265 vdev->queue->owner = NULL; 1266 if (lock) 1267 mutex_unlock(lock); 1268 } 1269 /* 1270 * Now we put the device, and in most cases this will release 1271 * everything. 1272 */ 1273 put_device(&vdev->dev); 1274 } 1275 EXPORT_SYMBOL_GPL(vb2_video_unregister_device); 1276 1277 /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ 1278 1279 void vb2_ops_wait_prepare(struct vb2_queue *vq) 1280 { 1281 mutex_unlock(vq->lock); 1282 } 1283 EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); 1284 1285 void vb2_ops_wait_finish(struct vb2_queue *vq) 1286 { 1287 mutex_lock(vq->lock); 1288 } 1289 EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); 1290 1291 /* 1292 * Note that this function is called during validation time and 1293 * thus the req_queue_mutex is held to ensure no request objects 1294 * can be added or deleted while validating. So there is no need 1295 * to protect the objects list. 1296 */ 1297 int vb2_request_validate(struct media_request *req) 1298 { 1299 struct media_request_object *obj; 1300 int ret = 0; 1301 1302 if (!vb2_request_buffer_cnt(req)) 1303 return -ENOENT; 1304 1305 list_for_each_entry(obj, &req->objects, list) { 1306 if (!obj->ops->prepare) 1307 continue; 1308 1309 ret = obj->ops->prepare(obj); 1310 if (ret) 1311 break; 1312 } 1313 1314 if (ret) { 1315 list_for_each_entry_continue_reverse(obj, &req->objects, list) 1316 if (obj->ops->unprepare) 1317 obj->ops->unprepare(obj); 1318 return ret; 1319 } 1320 return 0; 1321 } 1322 EXPORT_SYMBOL_GPL(vb2_request_validate); 1323 1324 void vb2_request_queue(struct media_request *req) 1325 { 1326 struct media_request_object *obj, *obj_safe; 1327 1328 /* 1329 * Queue all objects. Note that buffer objects are at the end of the 1330 * objects list, after all other object types. Once buffer objects 1331 * are queued, the driver might delete them immediately (if the driver 1332 * processes the buffer at once), so we have to use 1333 * list_for_each_entry_safe() to handle the case where the object we 1334 * queue is deleted. 1335 */ 1336 list_for_each_entry_safe(obj, obj_safe, &req->objects, list) 1337 if (obj->ops->queue) 1338 obj->ops->queue(obj); 1339 } 1340 EXPORT_SYMBOL_GPL(vb2_request_queue); 1341 1342 MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); 1343 MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); 1344 MODULE_LICENSE("GPL"); 1345