1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Media entity 4 * 5 * Copyright (C) 2010 Nokia Corporation 6 * 7 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> 8 * Sakari Ailus <sakari.ailus@iki.fi> 9 */ 10 11 #include <linux/bitmap.h> 12 #include <linux/list.h> 13 #include <linux/property.h> 14 #include <linux/slab.h> 15 #include <media/media-entity.h> 16 #include <media/media-device.h> 17 18 static inline const char *intf_type(struct media_interface *intf) 19 { 20 switch (intf->type) { 21 case MEDIA_INTF_T_DVB_FE: 22 return "dvb-frontend"; 23 case MEDIA_INTF_T_DVB_DEMUX: 24 return "dvb-demux"; 25 case MEDIA_INTF_T_DVB_DVR: 26 return "dvb-dvr"; 27 case MEDIA_INTF_T_DVB_CA: 28 return "dvb-ca"; 29 case MEDIA_INTF_T_DVB_NET: 30 return "dvb-net"; 31 case MEDIA_INTF_T_V4L_VIDEO: 32 return "v4l-video"; 33 case MEDIA_INTF_T_V4L_VBI: 34 return "v4l-vbi"; 35 case MEDIA_INTF_T_V4L_RADIO: 36 return "v4l-radio"; 37 case MEDIA_INTF_T_V4L_SUBDEV: 38 return "v4l-subdev"; 39 case MEDIA_INTF_T_V4L_SWRADIO: 40 return "v4l-swradio"; 41 case MEDIA_INTF_T_V4L_TOUCH: 42 return "v4l-touch"; 43 default: 44 return "unknown-intf"; 45 } 46 }; 47 48 static inline const char *link_type_name(struct media_link *link) 49 { 50 switch (link->flags & MEDIA_LNK_FL_LINK_TYPE) { 51 case MEDIA_LNK_FL_DATA_LINK: 52 return "data"; 53 case MEDIA_LNK_FL_INTERFACE_LINK: 54 return "interface"; 55 case MEDIA_LNK_FL_ANCILLARY_LINK: 56 return "ancillary"; 57 default: 58 return "unknown"; 59 } 60 } 61 62 __must_check int __media_entity_enum_init(struct media_entity_enum *ent_enum, 63 int idx_max) 64 { 65 idx_max = ALIGN(idx_max, BITS_PER_LONG); 66 ent_enum->bmap = bitmap_zalloc(idx_max, GFP_KERNEL); 67 if (!ent_enum->bmap) 68 return -ENOMEM; 69 70 ent_enum->idx_max = idx_max; 71 72 return 0; 73 } 74 EXPORT_SYMBOL_GPL(__media_entity_enum_init); 75 76 void media_entity_enum_cleanup(struct media_entity_enum *ent_enum) 77 { 78 bitmap_free(ent_enum->bmap); 79 } 80 EXPORT_SYMBOL_GPL(media_entity_enum_cleanup); 81 82 /** 83 * dev_dbg_obj - Prints in debug mode a change on some object 84 * 85 * @event_name: Name of the event to report. Could be __func__ 86 * @gobj: Pointer to the object 87 * 88 * Enabled only if DEBUG or CONFIG_DYNAMIC_DEBUG. Otherwise, it 89 * won't produce any code. 90 */ 91 static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj) 92 { 93 #if defined(DEBUG) || defined (CONFIG_DYNAMIC_DEBUG) 94 switch (media_type(gobj)) { 95 case MEDIA_GRAPH_ENTITY: 96 dev_dbg(gobj->mdev->dev, 97 "%s id %u: entity '%s'\n", 98 event_name, media_id(gobj), 99 gobj_to_entity(gobj)->name); 100 break; 101 case MEDIA_GRAPH_LINK: 102 { 103 struct media_link *link = gobj_to_link(gobj); 104 105 dev_dbg(gobj->mdev->dev, 106 "%s id %u: %s link id %u ==> id %u\n", 107 event_name, media_id(gobj), link_type_name(link), 108 media_id(link->gobj0), 109 media_id(link->gobj1)); 110 break; 111 } 112 case MEDIA_GRAPH_PAD: 113 { 114 struct media_pad *pad = gobj_to_pad(gobj); 115 116 dev_dbg(gobj->mdev->dev, 117 "%s id %u: %s%spad '%s':%d\n", 118 event_name, media_id(gobj), 119 pad->flags & MEDIA_PAD_FL_SINK ? "sink " : "", 120 pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "", 121 pad->entity->name, pad->index); 122 break; 123 } 124 case MEDIA_GRAPH_INTF_DEVNODE: 125 { 126 struct media_interface *intf = gobj_to_intf(gobj); 127 struct media_intf_devnode *devnode = intf_to_devnode(intf); 128 129 dev_dbg(gobj->mdev->dev, 130 "%s id %u: intf_devnode %s - major: %d, minor: %d\n", 131 event_name, media_id(gobj), 132 intf_type(intf), 133 devnode->major, devnode->minor); 134 break; 135 } 136 } 137 #endif 138 } 139 140 void media_gobj_create(struct media_device *mdev, 141 enum media_gobj_type type, 142 struct media_gobj *gobj) 143 { 144 BUG_ON(!mdev); 145 146 gobj->mdev = mdev; 147 148 /* Create a per-type unique object ID */ 149 gobj->id = media_gobj_gen_id(type, ++mdev->id); 150 151 switch (type) { 152 case MEDIA_GRAPH_ENTITY: 153 list_add_tail(&gobj->list, &mdev->entities); 154 break; 155 case MEDIA_GRAPH_PAD: 156 list_add_tail(&gobj->list, &mdev->pads); 157 break; 158 case MEDIA_GRAPH_LINK: 159 list_add_tail(&gobj->list, &mdev->links); 160 break; 161 case MEDIA_GRAPH_INTF_DEVNODE: 162 list_add_tail(&gobj->list, &mdev->interfaces); 163 break; 164 } 165 166 mdev->topology_version++; 167 168 dev_dbg_obj(__func__, gobj); 169 } 170 171 void media_gobj_destroy(struct media_gobj *gobj) 172 { 173 /* Do nothing if the object is not linked. */ 174 if (gobj->mdev == NULL) 175 return; 176 177 dev_dbg_obj(__func__, gobj); 178 179 gobj->mdev->topology_version++; 180 181 /* Remove the object from mdev list */ 182 list_del(&gobj->list); 183 184 gobj->mdev = NULL; 185 } 186 187 /* 188 * TODO: Get rid of this. 189 */ 190 #define MEDIA_ENTITY_MAX_PADS 512 191 192 int media_entity_pads_init(struct media_entity *entity, u16 num_pads, 193 struct media_pad *pads) 194 { 195 struct media_device *mdev = entity->graph_obj.mdev; 196 unsigned int i; 197 198 if (num_pads >= MEDIA_ENTITY_MAX_PADS) 199 return -E2BIG; 200 201 entity->num_pads = num_pads; 202 entity->pads = pads; 203 204 if (mdev) 205 mutex_lock(&mdev->graph_mutex); 206 207 for (i = 0; i < num_pads; i++) { 208 pads[i].entity = entity; 209 pads[i].index = i; 210 if (mdev) 211 media_gobj_create(mdev, MEDIA_GRAPH_PAD, 212 &entity->pads[i].graph_obj); 213 } 214 215 if (mdev) 216 mutex_unlock(&mdev->graph_mutex); 217 218 return 0; 219 } 220 EXPORT_SYMBOL_GPL(media_entity_pads_init); 221 222 /* ----------------------------------------------------------------------------- 223 * Graph traversal 224 */ 225 226 static struct media_entity * 227 media_entity_other(struct media_entity *entity, struct media_link *link) 228 { 229 if (link->source->entity == entity) 230 return link->sink->entity; 231 else 232 return link->source->entity; 233 } 234 235 /* push an entity to traversal stack */ 236 static void stack_push(struct media_graph *graph, 237 struct media_entity *entity) 238 { 239 if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) { 240 WARN_ON(1); 241 return; 242 } 243 graph->top++; 244 graph->stack[graph->top].link = entity->links.next; 245 graph->stack[graph->top].entity = entity; 246 } 247 248 static struct media_entity *stack_pop(struct media_graph *graph) 249 { 250 struct media_entity *entity; 251 252 entity = graph->stack[graph->top].entity; 253 graph->top--; 254 255 return entity; 256 } 257 258 #define link_top(en) ((en)->stack[(en)->top].link) 259 #define stack_top(en) ((en)->stack[(en)->top].entity) 260 261 /** 262 * media_graph_walk_init - Allocate resources for graph walk 263 * @graph: Media graph structure that will be used to walk the graph 264 * @mdev: Media device 265 * 266 * Reserve resources for graph walk in media device's current 267 * state. The memory must be released using 268 * media_graph_walk_free(). 269 * 270 * Returns error on failure, zero on success. 271 */ 272 __must_check int media_graph_walk_init( 273 struct media_graph *graph, struct media_device *mdev) 274 { 275 return media_entity_enum_init(&graph->ent_enum, mdev); 276 } 277 EXPORT_SYMBOL_GPL(media_graph_walk_init); 278 279 /** 280 * media_graph_walk_cleanup - Release resources related to graph walking 281 * @graph: Media graph structure that was used to walk the graph 282 */ 283 void media_graph_walk_cleanup(struct media_graph *graph) 284 { 285 media_entity_enum_cleanup(&graph->ent_enum); 286 } 287 EXPORT_SYMBOL_GPL(media_graph_walk_cleanup); 288 289 void media_graph_walk_start(struct media_graph *graph, 290 struct media_entity *entity) 291 { 292 media_entity_enum_zero(&graph->ent_enum); 293 media_entity_enum_set(&graph->ent_enum, entity); 294 295 graph->top = 0; 296 graph->stack[graph->top].entity = NULL; 297 stack_push(graph, entity); 298 dev_dbg(entity->graph_obj.mdev->dev, 299 "begin graph walk at '%s'\n", entity->name); 300 } 301 EXPORT_SYMBOL_GPL(media_graph_walk_start); 302 303 static void media_graph_walk_iter(struct media_graph *graph) 304 { 305 struct media_entity *entity = stack_top(graph); 306 struct media_link *link; 307 struct media_entity *next; 308 309 link = list_entry(link_top(graph), typeof(*link), list); 310 311 /* If the link is not a data link, don't follow it */ 312 if ((link->flags & MEDIA_LNK_FL_LINK_TYPE) != MEDIA_LNK_FL_DATA_LINK) { 313 link_top(graph) = link_top(graph)->next; 314 return; 315 } 316 317 /* The link is not enabled so we do not follow. */ 318 if (!(link->flags & MEDIA_LNK_FL_ENABLED)) { 319 link_top(graph) = link_top(graph)->next; 320 dev_dbg(entity->graph_obj.mdev->dev, 321 "walk: skipping disabled link '%s':%u -> '%s':%u\n", 322 link->source->entity->name, link->source->index, 323 link->sink->entity->name, link->sink->index); 324 return; 325 } 326 327 /* Get the entity at the other end of the link. */ 328 next = media_entity_other(entity, link); 329 330 /* Has the entity already been visited? */ 331 if (media_entity_enum_test_and_set(&graph->ent_enum, next)) { 332 link_top(graph) = link_top(graph)->next; 333 dev_dbg(entity->graph_obj.mdev->dev, 334 "walk: skipping entity '%s' (already seen)\n", 335 next->name); 336 return; 337 } 338 339 /* Push the new entity to stack and start over. */ 340 link_top(graph) = link_top(graph)->next; 341 stack_push(graph, next); 342 dev_dbg(entity->graph_obj.mdev->dev, "walk: pushing '%s' on stack\n", 343 next->name); 344 lockdep_assert_held(&entity->graph_obj.mdev->graph_mutex); 345 } 346 347 struct media_entity *media_graph_walk_next(struct media_graph *graph) 348 { 349 struct media_entity *entity; 350 351 if (stack_top(graph) == NULL) 352 return NULL; 353 354 /* 355 * Depth first search. Push entity to stack and continue from 356 * top of the stack until no more entities on the level can be 357 * found. 358 */ 359 while (link_top(graph) != &stack_top(graph)->links) 360 media_graph_walk_iter(graph); 361 362 entity = stack_pop(graph); 363 dev_dbg(entity->graph_obj.mdev->dev, 364 "walk: returning entity '%s'\n", entity->name); 365 366 return entity; 367 } 368 EXPORT_SYMBOL_GPL(media_graph_walk_next); 369 370 int media_entity_get_fwnode_pad(struct media_entity *entity, 371 struct fwnode_handle *fwnode, 372 unsigned long direction_flags) 373 { 374 struct fwnode_endpoint endpoint; 375 unsigned int i; 376 int ret; 377 378 if (!entity->ops || !entity->ops->get_fwnode_pad) { 379 for (i = 0; i < entity->num_pads; i++) { 380 if (entity->pads[i].flags & direction_flags) 381 return i; 382 } 383 384 return -ENXIO; 385 } 386 387 ret = fwnode_graph_parse_endpoint(fwnode, &endpoint); 388 if (ret) 389 return ret; 390 391 ret = entity->ops->get_fwnode_pad(entity, &endpoint); 392 if (ret < 0) 393 return ret; 394 395 if (ret >= entity->num_pads) 396 return -ENXIO; 397 398 if (!(entity->pads[ret].flags & direction_flags)) 399 return -ENXIO; 400 401 return ret; 402 } 403 EXPORT_SYMBOL_GPL(media_entity_get_fwnode_pad); 404 405 /* ----------------------------------------------------------------------------- 406 * Pipeline management 407 */ 408 409 __must_check int __media_pipeline_start(struct media_entity *entity, 410 struct media_pipeline *pipe) 411 { 412 struct media_device *mdev = entity->graph_obj.mdev; 413 struct media_graph *graph = &pipe->graph; 414 struct media_entity *entity_err = entity; 415 struct media_link *link; 416 int ret; 417 418 if (pipe->streaming_count) { 419 pipe->streaming_count++; 420 return 0; 421 } 422 423 ret = media_graph_walk_init(&pipe->graph, mdev); 424 if (ret) 425 return ret; 426 427 media_graph_walk_start(&pipe->graph, entity); 428 429 while ((entity = media_graph_walk_next(graph))) { 430 DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS); 431 DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS); 432 433 if (entity->pipe && entity->pipe != pipe) { 434 pr_err("Pipe active for %s. Can't start for %s\n", 435 entity->name, 436 entity_err->name); 437 ret = -EBUSY; 438 goto error; 439 } 440 441 /* Already streaming --- no need to check. */ 442 if (entity->pipe) 443 continue; 444 445 entity->pipe = pipe; 446 447 if (!entity->ops || !entity->ops->link_validate) 448 continue; 449 450 bitmap_zero(active, entity->num_pads); 451 bitmap_fill(has_no_links, entity->num_pads); 452 453 for_each_media_entity_data_link(entity, link) { 454 struct media_pad *pad = link->sink->entity == entity 455 ? link->sink : link->source; 456 457 /* Mark that a pad is connected by a link. */ 458 bitmap_clear(has_no_links, pad->index, 1); 459 460 /* 461 * Pads that either do not need to connect or 462 * are connected through an enabled link are 463 * fine. 464 */ 465 if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT) || 466 link->flags & MEDIA_LNK_FL_ENABLED) 467 bitmap_set(active, pad->index, 1); 468 469 /* 470 * Link validation will only take place for 471 * sink ends of the link that are enabled. 472 */ 473 if (link->sink != pad || 474 !(link->flags & MEDIA_LNK_FL_ENABLED)) 475 continue; 476 477 ret = entity->ops->link_validate(link); 478 if (ret < 0 && ret != -ENOIOCTLCMD) { 479 dev_dbg(entity->graph_obj.mdev->dev, 480 "link validation failed for '%s':%u -> '%s':%u, error %d\n", 481 link->source->entity->name, 482 link->source->index, 483 entity->name, link->sink->index, ret); 484 goto error; 485 } 486 } 487 488 /* Either no links or validated links are fine. */ 489 bitmap_or(active, active, has_no_links, entity->num_pads); 490 491 if (!bitmap_full(active, entity->num_pads)) { 492 ret = -ENOLINK; 493 dev_dbg(entity->graph_obj.mdev->dev, 494 "'%s':%u must be connected by an enabled link\n", 495 entity->name, 496 (unsigned)find_first_zero_bit( 497 active, entity->num_pads)); 498 goto error; 499 } 500 } 501 502 pipe->streaming_count++; 503 504 return 0; 505 506 error: 507 /* 508 * Link validation on graph failed. We revert what we did and 509 * return the error. 510 */ 511 media_graph_walk_start(graph, entity_err); 512 513 while ((entity_err = media_graph_walk_next(graph))) { 514 entity_err->pipe = NULL; 515 516 /* 517 * We haven't started entities further than this so we quit 518 * here. 519 */ 520 if (entity_err == entity) 521 break; 522 } 523 524 media_graph_walk_cleanup(graph); 525 526 return ret; 527 } 528 EXPORT_SYMBOL_GPL(__media_pipeline_start); 529 530 __must_check int media_pipeline_start(struct media_entity *entity, 531 struct media_pipeline *pipe) 532 { 533 struct media_device *mdev = entity->graph_obj.mdev; 534 int ret; 535 536 mutex_lock(&mdev->graph_mutex); 537 ret = __media_pipeline_start(entity, pipe); 538 mutex_unlock(&mdev->graph_mutex); 539 return ret; 540 } 541 EXPORT_SYMBOL_GPL(media_pipeline_start); 542 543 void __media_pipeline_stop(struct media_entity *entity) 544 { 545 struct media_graph *graph = &entity->pipe->graph; 546 struct media_pipeline *pipe = entity->pipe; 547 548 /* 549 * If the following check fails, the driver has performed an 550 * unbalanced call to media_pipeline_stop() 551 */ 552 if (WARN_ON(!pipe)) 553 return; 554 555 if (--pipe->streaming_count) 556 return; 557 558 media_graph_walk_start(graph, entity); 559 560 while ((entity = media_graph_walk_next(graph))) 561 entity->pipe = NULL; 562 563 media_graph_walk_cleanup(graph); 564 565 } 566 EXPORT_SYMBOL_GPL(__media_pipeline_stop); 567 568 void media_pipeline_stop(struct media_entity *entity) 569 { 570 struct media_device *mdev = entity->graph_obj.mdev; 571 572 mutex_lock(&mdev->graph_mutex); 573 __media_pipeline_stop(entity); 574 mutex_unlock(&mdev->graph_mutex); 575 } 576 EXPORT_SYMBOL_GPL(media_pipeline_stop); 577 578 /* ----------------------------------------------------------------------------- 579 * Links management 580 */ 581 582 static struct media_link *media_add_link(struct list_head *head) 583 { 584 struct media_link *link; 585 586 link = kzalloc(sizeof(*link), GFP_KERNEL); 587 if (link == NULL) 588 return NULL; 589 590 list_add_tail(&link->list, head); 591 592 return link; 593 } 594 595 static void __media_entity_remove_link(struct media_entity *entity, 596 struct media_link *link) 597 { 598 struct media_link *rlink, *tmp; 599 struct media_entity *remote; 600 601 /* Remove the reverse links for a data link. */ 602 if ((link->flags & MEDIA_LNK_FL_LINK_TYPE) == MEDIA_LNK_FL_DATA_LINK) { 603 if (link->source->entity == entity) 604 remote = link->sink->entity; 605 else 606 remote = link->source->entity; 607 608 list_for_each_entry_safe(rlink, tmp, &remote->links, list) { 609 if (rlink != link->reverse) 610 continue; 611 612 if (link->source->entity == entity) 613 remote->num_backlinks--; 614 615 /* Remove the remote link */ 616 list_del(&rlink->list); 617 media_gobj_destroy(&rlink->graph_obj); 618 kfree(rlink); 619 620 if (--remote->num_links == 0) 621 break; 622 } 623 } 624 625 list_del(&link->list); 626 media_gobj_destroy(&link->graph_obj); 627 kfree(link); 628 } 629 630 int media_get_pad_index(struct media_entity *entity, bool is_sink, 631 enum media_pad_signal_type sig_type) 632 { 633 int i; 634 bool pad_is_sink; 635 636 if (!entity) 637 return -EINVAL; 638 639 for (i = 0; i < entity->num_pads; i++) { 640 if (entity->pads[i].flags & MEDIA_PAD_FL_SINK) 641 pad_is_sink = true; 642 else if (entity->pads[i].flags & MEDIA_PAD_FL_SOURCE) 643 pad_is_sink = false; 644 else 645 continue; /* This is an error! */ 646 647 if (pad_is_sink != is_sink) 648 continue; 649 if (entity->pads[i].sig_type == sig_type) 650 return i; 651 } 652 return -EINVAL; 653 } 654 EXPORT_SYMBOL_GPL(media_get_pad_index); 655 656 int 657 media_create_pad_link(struct media_entity *source, u16 source_pad, 658 struct media_entity *sink, u16 sink_pad, u32 flags) 659 { 660 struct media_link *link; 661 struct media_link *backlink; 662 663 if (WARN_ON(!source || !sink) || 664 WARN_ON(source_pad >= source->num_pads) || 665 WARN_ON(sink_pad >= sink->num_pads)) 666 return -EINVAL; 667 if (WARN_ON(!(source->pads[source_pad].flags & MEDIA_PAD_FL_SOURCE))) 668 return -EINVAL; 669 if (WARN_ON(!(sink->pads[sink_pad].flags & MEDIA_PAD_FL_SINK))) 670 return -EINVAL; 671 672 link = media_add_link(&source->links); 673 if (link == NULL) 674 return -ENOMEM; 675 676 link->source = &source->pads[source_pad]; 677 link->sink = &sink->pads[sink_pad]; 678 link->flags = flags & ~MEDIA_LNK_FL_INTERFACE_LINK; 679 680 /* Initialize graph object embedded at the new link */ 681 media_gobj_create(source->graph_obj.mdev, MEDIA_GRAPH_LINK, 682 &link->graph_obj); 683 684 /* Create the backlink. Backlinks are used to help graph traversal and 685 * are not reported to userspace. 686 */ 687 backlink = media_add_link(&sink->links); 688 if (backlink == NULL) { 689 __media_entity_remove_link(source, link); 690 return -ENOMEM; 691 } 692 693 backlink->source = &source->pads[source_pad]; 694 backlink->sink = &sink->pads[sink_pad]; 695 backlink->flags = flags; 696 backlink->is_backlink = true; 697 698 /* Initialize graph object embedded at the new link */ 699 media_gobj_create(sink->graph_obj.mdev, MEDIA_GRAPH_LINK, 700 &backlink->graph_obj); 701 702 link->reverse = backlink; 703 backlink->reverse = link; 704 705 sink->num_backlinks++; 706 sink->num_links++; 707 source->num_links++; 708 709 return 0; 710 } 711 EXPORT_SYMBOL_GPL(media_create_pad_link); 712 713 int media_create_pad_links(const struct media_device *mdev, 714 const u32 source_function, 715 struct media_entity *source, 716 const u16 source_pad, 717 const u32 sink_function, 718 struct media_entity *sink, 719 const u16 sink_pad, 720 u32 flags, 721 const bool allow_both_undefined) 722 { 723 struct media_entity *entity; 724 unsigned function; 725 int ret; 726 727 /* Trivial case: 1:1 relation */ 728 if (source && sink) 729 return media_create_pad_link(source, source_pad, 730 sink, sink_pad, flags); 731 732 /* Worse case scenario: n:n relation */ 733 if (!source && !sink) { 734 if (!allow_both_undefined) 735 return 0; 736 media_device_for_each_entity(source, mdev) { 737 if (source->function != source_function) 738 continue; 739 media_device_for_each_entity(sink, mdev) { 740 if (sink->function != sink_function) 741 continue; 742 ret = media_create_pad_link(source, source_pad, 743 sink, sink_pad, 744 flags); 745 if (ret) 746 return ret; 747 flags &= ~(MEDIA_LNK_FL_ENABLED | 748 MEDIA_LNK_FL_IMMUTABLE); 749 } 750 } 751 return 0; 752 } 753 754 /* Handle 1:n and n:1 cases */ 755 if (source) 756 function = sink_function; 757 else 758 function = source_function; 759 760 media_device_for_each_entity(entity, mdev) { 761 if (entity->function != function) 762 continue; 763 764 if (source) 765 ret = media_create_pad_link(source, source_pad, 766 entity, sink_pad, flags); 767 else 768 ret = media_create_pad_link(entity, source_pad, 769 sink, sink_pad, flags); 770 if (ret) 771 return ret; 772 flags &= ~(MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE); 773 } 774 return 0; 775 } 776 EXPORT_SYMBOL_GPL(media_create_pad_links); 777 778 void __media_entity_remove_links(struct media_entity *entity) 779 { 780 struct media_link *link, *tmp; 781 782 list_for_each_entry_safe(link, tmp, &entity->links, list) 783 __media_entity_remove_link(entity, link); 784 785 entity->num_links = 0; 786 entity->num_backlinks = 0; 787 } 788 EXPORT_SYMBOL_GPL(__media_entity_remove_links); 789 790 void media_entity_remove_links(struct media_entity *entity) 791 { 792 struct media_device *mdev = entity->graph_obj.mdev; 793 794 /* Do nothing if the entity is not registered. */ 795 if (mdev == NULL) 796 return; 797 798 mutex_lock(&mdev->graph_mutex); 799 __media_entity_remove_links(entity); 800 mutex_unlock(&mdev->graph_mutex); 801 } 802 EXPORT_SYMBOL_GPL(media_entity_remove_links); 803 804 static int __media_entity_setup_link_notify(struct media_link *link, u32 flags) 805 { 806 int ret; 807 808 /* Notify both entities. */ 809 ret = media_entity_call(link->source->entity, link_setup, 810 link->source, link->sink, flags); 811 if (ret < 0 && ret != -ENOIOCTLCMD) 812 return ret; 813 814 ret = media_entity_call(link->sink->entity, link_setup, 815 link->sink, link->source, flags); 816 if (ret < 0 && ret != -ENOIOCTLCMD) { 817 media_entity_call(link->source->entity, link_setup, 818 link->source, link->sink, link->flags); 819 return ret; 820 } 821 822 link->flags = flags; 823 link->reverse->flags = link->flags; 824 825 return 0; 826 } 827 828 int __media_entity_setup_link(struct media_link *link, u32 flags) 829 { 830 const u32 mask = MEDIA_LNK_FL_ENABLED; 831 struct media_device *mdev; 832 struct media_entity *source, *sink; 833 int ret = -EBUSY; 834 835 if (link == NULL) 836 return -EINVAL; 837 838 /* The non-modifiable link flags must not be modified. */ 839 if ((link->flags & ~mask) != (flags & ~mask)) 840 return -EINVAL; 841 842 if (link->flags & MEDIA_LNK_FL_IMMUTABLE) 843 return link->flags == flags ? 0 : -EINVAL; 844 845 if (link->flags == flags) 846 return 0; 847 848 source = link->source->entity; 849 sink = link->sink->entity; 850 851 if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) && 852 (media_entity_is_streaming(source) || 853 media_entity_is_streaming(sink))) 854 return -EBUSY; 855 856 mdev = source->graph_obj.mdev; 857 858 if (mdev->ops && mdev->ops->link_notify) { 859 ret = mdev->ops->link_notify(link, flags, 860 MEDIA_DEV_NOTIFY_PRE_LINK_CH); 861 if (ret < 0) 862 return ret; 863 } 864 865 ret = __media_entity_setup_link_notify(link, flags); 866 867 if (mdev->ops && mdev->ops->link_notify) 868 mdev->ops->link_notify(link, flags, 869 MEDIA_DEV_NOTIFY_POST_LINK_CH); 870 871 return ret; 872 } 873 EXPORT_SYMBOL_GPL(__media_entity_setup_link); 874 875 int media_entity_setup_link(struct media_link *link, u32 flags) 876 { 877 int ret; 878 879 mutex_lock(&link->graph_obj.mdev->graph_mutex); 880 ret = __media_entity_setup_link(link, flags); 881 mutex_unlock(&link->graph_obj.mdev->graph_mutex); 882 883 return ret; 884 } 885 EXPORT_SYMBOL_GPL(media_entity_setup_link); 886 887 struct media_link * 888 media_entity_find_link(struct media_pad *source, struct media_pad *sink) 889 { 890 struct media_link *link; 891 892 for_each_media_entity_data_link(source->entity, link) { 893 if (link->source->entity == source->entity && 894 link->source->index == source->index && 895 link->sink->entity == sink->entity && 896 link->sink->index == sink->index) 897 return link; 898 } 899 900 return NULL; 901 } 902 EXPORT_SYMBOL_GPL(media_entity_find_link); 903 904 struct media_pad *media_pad_remote_pad_first(const struct media_pad *pad) 905 { 906 struct media_link *link; 907 908 for_each_media_entity_data_link(pad->entity, link) { 909 if (!(link->flags & MEDIA_LNK_FL_ENABLED)) 910 continue; 911 912 if (link->source == pad) 913 return link->sink; 914 915 if (link->sink == pad) 916 return link->source; 917 } 918 919 return NULL; 920 921 } 922 EXPORT_SYMBOL_GPL(media_pad_remote_pad_first); 923 924 static void media_interface_init(struct media_device *mdev, 925 struct media_interface *intf, 926 u32 gobj_type, 927 u32 intf_type, u32 flags) 928 { 929 intf->type = intf_type; 930 intf->flags = flags; 931 INIT_LIST_HEAD(&intf->links); 932 933 media_gobj_create(mdev, gobj_type, &intf->graph_obj); 934 } 935 936 /* Functions related to the media interface via device nodes */ 937 938 struct media_intf_devnode *media_devnode_create(struct media_device *mdev, 939 u32 type, u32 flags, 940 u32 major, u32 minor) 941 { 942 struct media_intf_devnode *devnode; 943 944 devnode = kzalloc(sizeof(*devnode), GFP_KERNEL); 945 if (!devnode) 946 return NULL; 947 948 devnode->major = major; 949 devnode->minor = minor; 950 951 media_interface_init(mdev, &devnode->intf, MEDIA_GRAPH_INTF_DEVNODE, 952 type, flags); 953 954 return devnode; 955 } 956 EXPORT_SYMBOL_GPL(media_devnode_create); 957 958 void media_devnode_remove(struct media_intf_devnode *devnode) 959 { 960 media_remove_intf_links(&devnode->intf); 961 media_gobj_destroy(&devnode->intf.graph_obj); 962 kfree(devnode); 963 } 964 EXPORT_SYMBOL_GPL(media_devnode_remove); 965 966 struct media_link *media_create_intf_link(struct media_entity *entity, 967 struct media_interface *intf, 968 u32 flags) 969 { 970 struct media_link *link; 971 972 link = media_add_link(&intf->links); 973 if (link == NULL) 974 return NULL; 975 976 link->intf = intf; 977 link->entity = entity; 978 link->flags = flags | MEDIA_LNK_FL_INTERFACE_LINK; 979 980 /* Initialize graph object embedded at the new link */ 981 media_gobj_create(intf->graph_obj.mdev, MEDIA_GRAPH_LINK, 982 &link->graph_obj); 983 984 return link; 985 } 986 EXPORT_SYMBOL_GPL(media_create_intf_link); 987 988 void __media_remove_intf_link(struct media_link *link) 989 { 990 list_del(&link->list); 991 media_gobj_destroy(&link->graph_obj); 992 kfree(link); 993 } 994 EXPORT_SYMBOL_GPL(__media_remove_intf_link); 995 996 void media_remove_intf_link(struct media_link *link) 997 { 998 struct media_device *mdev = link->graph_obj.mdev; 999 1000 /* Do nothing if the intf is not registered. */ 1001 if (mdev == NULL) 1002 return; 1003 1004 mutex_lock(&mdev->graph_mutex); 1005 __media_remove_intf_link(link); 1006 mutex_unlock(&mdev->graph_mutex); 1007 } 1008 EXPORT_SYMBOL_GPL(media_remove_intf_link); 1009 1010 void __media_remove_intf_links(struct media_interface *intf) 1011 { 1012 struct media_link *link, *tmp; 1013 1014 list_for_each_entry_safe(link, tmp, &intf->links, list) 1015 __media_remove_intf_link(link); 1016 1017 } 1018 EXPORT_SYMBOL_GPL(__media_remove_intf_links); 1019 1020 void media_remove_intf_links(struct media_interface *intf) 1021 { 1022 struct media_device *mdev = intf->graph_obj.mdev; 1023 1024 /* Do nothing if the intf is not registered. */ 1025 if (mdev == NULL) 1026 return; 1027 1028 mutex_lock(&mdev->graph_mutex); 1029 __media_remove_intf_links(intf); 1030 mutex_unlock(&mdev->graph_mutex); 1031 } 1032 EXPORT_SYMBOL_GPL(media_remove_intf_links); 1033 1034 struct media_link *media_create_ancillary_link(struct media_entity *primary, 1035 struct media_entity *ancillary) 1036 { 1037 struct media_link *link; 1038 1039 link = media_add_link(&primary->links); 1040 if (!link) 1041 return ERR_PTR(-ENOMEM); 1042 1043 link->gobj0 = &primary->graph_obj; 1044 link->gobj1 = &ancillary->graph_obj; 1045 link->flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED | 1046 MEDIA_LNK_FL_ANCILLARY_LINK; 1047 1048 /* Initialize graph object embedded in the new link */ 1049 media_gobj_create(primary->graph_obj.mdev, MEDIA_GRAPH_LINK, 1050 &link->graph_obj); 1051 1052 return link; 1053 } 1054 EXPORT_SYMBOL_GPL(media_create_ancillary_link); 1055 1056 struct media_link *__media_entity_next_link(struct media_entity *entity, 1057 struct media_link *link, 1058 unsigned long link_type) 1059 { 1060 link = link ? list_next_entry(link, list) 1061 : list_first_entry(&entity->links, typeof(*link), list); 1062 1063 list_for_each_entry_from(link, &entity->links, list) 1064 if ((link->flags & MEDIA_LNK_FL_LINK_TYPE) == link_type) 1065 return link; 1066 1067 return NULL; 1068 } 1069 EXPORT_SYMBOL_GPL(__media_entity_next_link); 1070