1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Thunderbolt driver - bus logic (NHI independent) 4 * 5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> 6 * Copyright (C) 2019, Intel Corporation 7 */ 8 9 #include <linux/slab.h> 10 #include <linux/errno.h> 11 #include <linux/delay.h> 12 #include <linux/pm_runtime.h> 13 14 #include "tb.h" 15 #include "tb_regs.h" 16 #include "tunnel.h" 17 18 /** 19 * struct tb_cm - Simple Thunderbolt connection manager 20 * @tunnel_list: List of active tunnels 21 * @dp_resources: List of available DP resources for DP tunneling 22 * @hotplug_active: tb_handle_hotplug will stop progressing plug 23 * events and exit if this is not set (it needs to 24 * acquire the lock one more time). Used to drain wq 25 * after cfg has been paused. 26 * @remove_work: Work used to remove any unplugged routers after 27 * runtime resume 28 */ 29 struct tb_cm { 30 struct list_head tunnel_list; 31 struct list_head dp_resources; 32 bool hotplug_active; 33 struct delayed_work remove_work; 34 }; 35 36 static inline struct tb *tcm_to_tb(struct tb_cm *tcm) 37 { 38 return ((void *)tcm - sizeof(struct tb)); 39 } 40 41 struct tb_hotplug_event { 42 struct work_struct work; 43 struct tb *tb; 44 u64 route; 45 u8 port; 46 bool unplug; 47 }; 48 49 static void tb_handle_hotplug(struct work_struct *work); 50 51 static void tb_queue_hotplug(struct tb *tb, u64 route, u8 port, bool unplug) 52 { 53 struct tb_hotplug_event *ev; 54 55 ev = kmalloc(sizeof(*ev), GFP_KERNEL); 56 if (!ev) 57 return; 58 59 ev->tb = tb; 60 ev->route = route; 61 ev->port = port; 62 ev->unplug = unplug; 63 INIT_WORK(&ev->work, tb_handle_hotplug); 64 queue_work(tb->wq, &ev->work); 65 } 66 67 /* enumeration & hot plug handling */ 68 69 static void tb_add_dp_resources(struct tb_switch *sw) 70 { 71 struct tb_cm *tcm = tb_priv(sw->tb); 72 struct tb_port *port; 73 74 tb_switch_for_each_port(sw, port) { 75 if (!tb_port_is_dpin(port)) 76 continue; 77 78 if (!tb_switch_query_dp_resource(sw, port)) 79 continue; 80 81 list_add_tail(&port->list, &tcm->dp_resources); 82 tb_port_dbg(port, "DP IN resource available\n"); 83 } 84 } 85 86 static void tb_remove_dp_resources(struct tb_switch *sw) 87 { 88 struct tb_cm *tcm = tb_priv(sw->tb); 89 struct tb_port *port, *tmp; 90 91 /* Clear children resources first */ 92 tb_switch_for_each_port(sw, port) { 93 if (tb_port_has_remote(port)) 94 tb_remove_dp_resources(port->remote->sw); 95 } 96 97 list_for_each_entry_safe(port, tmp, &tcm->dp_resources, list) { 98 if (port->sw == sw) { 99 tb_port_dbg(port, "DP OUT resource unavailable\n"); 100 list_del_init(&port->list); 101 } 102 } 103 } 104 105 static void tb_discover_tunnels(struct tb_switch *sw) 106 { 107 struct tb *tb = sw->tb; 108 struct tb_cm *tcm = tb_priv(tb); 109 struct tb_port *port; 110 111 tb_switch_for_each_port(sw, port) { 112 struct tb_tunnel *tunnel = NULL; 113 114 switch (port->config.type) { 115 case TB_TYPE_DP_HDMI_IN: 116 tunnel = tb_tunnel_discover_dp(tb, port); 117 break; 118 119 case TB_TYPE_PCIE_DOWN: 120 tunnel = tb_tunnel_discover_pci(tb, port); 121 break; 122 123 case TB_TYPE_USB3_DOWN: 124 tunnel = tb_tunnel_discover_usb3(tb, port); 125 break; 126 127 default: 128 break; 129 } 130 131 if (!tunnel) 132 continue; 133 134 if (tb_tunnel_is_pci(tunnel)) { 135 struct tb_switch *parent = tunnel->dst_port->sw; 136 137 while (parent != tunnel->src_port->sw) { 138 parent->boot = true; 139 parent = tb_switch_parent(parent); 140 } 141 } else if (tb_tunnel_is_dp(tunnel)) { 142 /* Keep the domain from powering down */ 143 pm_runtime_get_sync(&tunnel->src_port->sw->dev); 144 pm_runtime_get_sync(&tunnel->dst_port->sw->dev); 145 } 146 147 list_add_tail(&tunnel->list, &tcm->tunnel_list); 148 } 149 150 tb_switch_for_each_port(sw, port) { 151 if (tb_port_has_remote(port)) 152 tb_discover_tunnels(port->remote->sw); 153 } 154 } 155 156 static int tb_port_configure_xdomain(struct tb_port *port) 157 { 158 /* 159 * XDomain paths currently only support single lane so we must 160 * disable the other lane according to USB4 spec. 161 */ 162 tb_port_disable(port->dual_link_port); 163 164 if (tb_switch_is_usb4(port->sw)) 165 return usb4_port_configure_xdomain(port); 166 return tb_lc_configure_xdomain(port); 167 } 168 169 static void tb_port_unconfigure_xdomain(struct tb_port *port) 170 { 171 if (tb_switch_is_usb4(port->sw)) 172 usb4_port_unconfigure_xdomain(port); 173 else 174 tb_lc_unconfigure_xdomain(port); 175 176 tb_port_enable(port->dual_link_port); 177 } 178 179 static void tb_scan_xdomain(struct tb_port *port) 180 { 181 struct tb_switch *sw = port->sw; 182 struct tb *tb = sw->tb; 183 struct tb_xdomain *xd; 184 u64 route; 185 186 route = tb_downstream_route(port); 187 xd = tb_xdomain_find_by_route(tb, route); 188 if (xd) { 189 tb_xdomain_put(xd); 190 return; 191 } 192 193 xd = tb_xdomain_alloc(tb, &sw->dev, route, tb->root_switch->uuid, 194 NULL); 195 if (xd) { 196 tb_port_at(route, sw)->xdomain = xd; 197 tb_port_configure_xdomain(port); 198 tb_xdomain_add(xd); 199 } 200 } 201 202 static int tb_enable_tmu(struct tb_switch *sw) 203 { 204 int ret; 205 206 /* If it is already enabled in correct mode, don't touch it */ 207 if (tb_switch_tmu_is_enabled(sw)) 208 return 0; 209 210 ret = tb_switch_tmu_disable(sw); 211 if (ret) 212 return ret; 213 214 ret = tb_switch_tmu_post_time(sw); 215 if (ret) 216 return ret; 217 218 return tb_switch_tmu_enable(sw); 219 } 220 221 /** 222 * tb_find_unused_port() - return the first inactive port on @sw 223 * @sw: Switch to find the port on 224 * @type: Port type to look for 225 */ 226 static struct tb_port *tb_find_unused_port(struct tb_switch *sw, 227 enum tb_port_type type) 228 { 229 struct tb_port *port; 230 231 tb_switch_for_each_port(sw, port) { 232 if (tb_is_upstream_port(port)) 233 continue; 234 if (port->config.type != type) 235 continue; 236 if (!port->cap_adap) 237 continue; 238 if (tb_port_is_enabled(port)) 239 continue; 240 return port; 241 } 242 return NULL; 243 } 244 245 static struct tb_port *tb_find_usb3_down(struct tb_switch *sw, 246 const struct tb_port *port) 247 { 248 struct tb_port *down; 249 250 down = usb4_switch_map_usb3_down(sw, port); 251 if (down && !tb_usb3_port_is_enabled(down)) 252 return down; 253 return NULL; 254 } 255 256 static struct tb_tunnel *tb_find_tunnel(struct tb *tb, enum tb_tunnel_type type, 257 struct tb_port *src_port, 258 struct tb_port *dst_port) 259 { 260 struct tb_cm *tcm = tb_priv(tb); 261 struct tb_tunnel *tunnel; 262 263 list_for_each_entry(tunnel, &tcm->tunnel_list, list) { 264 if (tunnel->type == type && 265 ((src_port && src_port == tunnel->src_port) || 266 (dst_port && dst_port == tunnel->dst_port))) { 267 return tunnel; 268 } 269 } 270 271 return NULL; 272 } 273 274 static struct tb_tunnel *tb_find_first_usb3_tunnel(struct tb *tb, 275 struct tb_port *src_port, 276 struct tb_port *dst_port) 277 { 278 struct tb_port *port, *usb3_down; 279 struct tb_switch *sw; 280 281 /* Pick the router that is deepest in the topology */ 282 if (dst_port->sw->config.depth > src_port->sw->config.depth) 283 sw = dst_port->sw; 284 else 285 sw = src_port->sw; 286 287 /* Can't be the host router */ 288 if (sw == tb->root_switch) 289 return NULL; 290 291 /* Find the downstream USB4 port that leads to this router */ 292 port = tb_port_at(tb_route(sw), tb->root_switch); 293 /* Find the corresponding host router USB3 downstream port */ 294 usb3_down = usb4_switch_map_usb3_down(tb->root_switch, port); 295 if (!usb3_down) 296 return NULL; 297 298 return tb_find_tunnel(tb, TB_TUNNEL_USB3, usb3_down, NULL); 299 } 300 301 static int tb_available_bandwidth(struct tb *tb, struct tb_port *src_port, 302 struct tb_port *dst_port, int *available_up, int *available_down) 303 { 304 int usb3_consumed_up, usb3_consumed_down, ret; 305 struct tb_cm *tcm = tb_priv(tb); 306 struct tb_tunnel *tunnel; 307 struct tb_port *port; 308 309 tb_port_dbg(dst_port, "calculating available bandwidth\n"); 310 311 tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); 312 if (tunnel) { 313 ret = tb_tunnel_consumed_bandwidth(tunnel, &usb3_consumed_up, 314 &usb3_consumed_down); 315 if (ret) 316 return ret; 317 } else { 318 usb3_consumed_up = 0; 319 usb3_consumed_down = 0; 320 } 321 322 *available_up = *available_down = 40000; 323 324 /* Find the minimum available bandwidth over all links */ 325 tb_for_each_port_on_path(src_port, dst_port, port) { 326 int link_speed, link_width, up_bw, down_bw; 327 328 if (!tb_port_is_null(port)) 329 continue; 330 331 if (tb_is_upstream_port(port)) { 332 link_speed = port->sw->link_speed; 333 } else { 334 link_speed = tb_port_get_link_speed(port); 335 if (link_speed < 0) 336 return link_speed; 337 } 338 339 link_width = port->bonded ? 2 : 1; 340 341 up_bw = link_speed * link_width * 1000; /* Mb/s */ 342 /* Leave 10% guard band */ 343 up_bw -= up_bw / 10; 344 down_bw = up_bw; 345 346 tb_port_dbg(port, "link total bandwidth %d Mb/s\n", up_bw); 347 348 /* 349 * Find all DP tunnels that cross the port and reduce 350 * their consumed bandwidth from the available. 351 */ 352 list_for_each_entry(tunnel, &tcm->tunnel_list, list) { 353 int dp_consumed_up, dp_consumed_down; 354 355 if (!tb_tunnel_is_dp(tunnel)) 356 continue; 357 358 if (!tb_tunnel_port_on_path(tunnel, port)) 359 continue; 360 361 ret = tb_tunnel_consumed_bandwidth(tunnel, 362 &dp_consumed_up, 363 &dp_consumed_down); 364 if (ret) 365 return ret; 366 367 up_bw -= dp_consumed_up; 368 down_bw -= dp_consumed_down; 369 } 370 371 /* 372 * If USB3 is tunneled from the host router down to the 373 * branch leading to port we need to take USB3 consumed 374 * bandwidth into account regardless whether it actually 375 * crosses the port. 376 */ 377 up_bw -= usb3_consumed_up; 378 down_bw -= usb3_consumed_down; 379 380 if (up_bw < *available_up) 381 *available_up = up_bw; 382 if (down_bw < *available_down) 383 *available_down = down_bw; 384 } 385 386 if (*available_up < 0) 387 *available_up = 0; 388 if (*available_down < 0) 389 *available_down = 0; 390 391 return 0; 392 } 393 394 static int tb_release_unused_usb3_bandwidth(struct tb *tb, 395 struct tb_port *src_port, 396 struct tb_port *dst_port) 397 { 398 struct tb_tunnel *tunnel; 399 400 tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); 401 return tunnel ? tb_tunnel_release_unused_bandwidth(tunnel) : 0; 402 } 403 404 static void tb_reclaim_usb3_bandwidth(struct tb *tb, struct tb_port *src_port, 405 struct tb_port *dst_port) 406 { 407 int ret, available_up, available_down; 408 struct tb_tunnel *tunnel; 409 410 tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); 411 if (!tunnel) 412 return; 413 414 tb_dbg(tb, "reclaiming unused bandwidth for USB3\n"); 415 416 /* 417 * Calculate available bandwidth for the first hop USB3 tunnel. 418 * That determines the whole USB3 bandwidth for this branch. 419 */ 420 ret = tb_available_bandwidth(tb, tunnel->src_port, tunnel->dst_port, 421 &available_up, &available_down); 422 if (ret) { 423 tb_warn(tb, "failed to calculate available bandwidth\n"); 424 return; 425 } 426 427 tb_dbg(tb, "available bandwidth for USB3 %d/%d Mb/s\n", 428 available_up, available_down); 429 430 tb_tunnel_reclaim_available_bandwidth(tunnel, &available_up, &available_down); 431 } 432 433 static int tb_tunnel_usb3(struct tb *tb, struct tb_switch *sw) 434 { 435 struct tb_switch *parent = tb_switch_parent(sw); 436 int ret, available_up, available_down; 437 struct tb_port *up, *down, *port; 438 struct tb_cm *tcm = tb_priv(tb); 439 struct tb_tunnel *tunnel; 440 441 up = tb_switch_find_port(sw, TB_TYPE_USB3_UP); 442 if (!up) 443 return 0; 444 445 if (!sw->link_usb4) 446 return 0; 447 448 /* 449 * Look up available down port. Since we are chaining it should 450 * be found right above this switch. 451 */ 452 port = tb_port_at(tb_route(sw), parent); 453 down = tb_find_usb3_down(parent, port); 454 if (!down) 455 return 0; 456 457 if (tb_route(parent)) { 458 struct tb_port *parent_up; 459 /* 460 * Check first that the parent switch has its upstream USB3 461 * port enabled. Otherwise the chain is not complete and 462 * there is no point setting up a new tunnel. 463 */ 464 parent_up = tb_switch_find_port(parent, TB_TYPE_USB3_UP); 465 if (!parent_up || !tb_port_is_enabled(parent_up)) 466 return 0; 467 468 /* Make all unused bandwidth available for the new tunnel */ 469 ret = tb_release_unused_usb3_bandwidth(tb, down, up); 470 if (ret) 471 return ret; 472 } 473 474 ret = tb_available_bandwidth(tb, down, up, &available_up, 475 &available_down); 476 if (ret) 477 goto err_reclaim; 478 479 tb_port_dbg(up, "available bandwidth for new USB3 tunnel %d/%d Mb/s\n", 480 available_up, available_down); 481 482 tunnel = tb_tunnel_alloc_usb3(tb, up, down, available_up, 483 available_down); 484 if (!tunnel) { 485 ret = -ENOMEM; 486 goto err_reclaim; 487 } 488 489 if (tb_tunnel_activate(tunnel)) { 490 tb_port_info(up, 491 "USB3 tunnel activation failed, aborting\n"); 492 ret = -EIO; 493 goto err_free; 494 } 495 496 list_add_tail(&tunnel->list, &tcm->tunnel_list); 497 if (tb_route(parent)) 498 tb_reclaim_usb3_bandwidth(tb, down, up); 499 500 return 0; 501 502 err_free: 503 tb_tunnel_free(tunnel); 504 err_reclaim: 505 if (tb_route(parent)) 506 tb_reclaim_usb3_bandwidth(tb, down, up); 507 508 return ret; 509 } 510 511 static int tb_create_usb3_tunnels(struct tb_switch *sw) 512 { 513 struct tb_port *port; 514 int ret; 515 516 if (tb_route(sw)) { 517 ret = tb_tunnel_usb3(sw->tb, sw); 518 if (ret) 519 return ret; 520 } 521 522 tb_switch_for_each_port(sw, port) { 523 if (!tb_port_has_remote(port)) 524 continue; 525 ret = tb_create_usb3_tunnels(port->remote->sw); 526 if (ret) 527 return ret; 528 } 529 530 return 0; 531 } 532 533 static void tb_scan_port(struct tb_port *port); 534 535 /** 536 * tb_scan_switch() - scan for and initialize downstream switches 537 */ 538 static void tb_scan_switch(struct tb_switch *sw) 539 { 540 struct tb_port *port; 541 542 pm_runtime_get_sync(&sw->dev); 543 544 tb_switch_for_each_port(sw, port) 545 tb_scan_port(port); 546 547 pm_runtime_mark_last_busy(&sw->dev); 548 pm_runtime_put_autosuspend(&sw->dev); 549 } 550 551 /** 552 * tb_scan_port() - check for and initialize switches below port 553 */ 554 static void tb_scan_port(struct tb_port *port) 555 { 556 struct tb_cm *tcm = tb_priv(port->sw->tb); 557 struct tb_port *upstream_port; 558 struct tb_switch *sw; 559 560 if (tb_is_upstream_port(port)) 561 return; 562 563 if (tb_port_is_dpout(port) && tb_dp_port_hpd_is_active(port) == 1 && 564 !tb_dp_port_is_enabled(port)) { 565 tb_port_dbg(port, "DP adapter HPD set, queuing hotplug\n"); 566 tb_queue_hotplug(port->sw->tb, tb_route(port->sw), port->port, 567 false); 568 return; 569 } 570 571 if (port->config.type != TB_TYPE_PORT) 572 return; 573 if (port->dual_link_port && port->link_nr) 574 return; /* 575 * Downstream switch is reachable through two ports. 576 * Only scan on the primary port (link_nr == 0). 577 */ 578 if (tb_wait_for_port(port, false) <= 0) 579 return; 580 if (port->remote) { 581 tb_port_dbg(port, "port already has a remote\n"); 582 return; 583 } 584 585 tb_retimer_scan(port); 586 587 sw = tb_switch_alloc(port->sw->tb, &port->sw->dev, 588 tb_downstream_route(port)); 589 if (IS_ERR(sw)) { 590 /* 591 * If there is an error accessing the connected switch 592 * it may be connected to another domain. Also we allow 593 * the other domain to be connected to a max depth switch. 594 */ 595 if (PTR_ERR(sw) == -EIO || PTR_ERR(sw) == -EADDRNOTAVAIL) 596 tb_scan_xdomain(port); 597 return; 598 } 599 600 if (tb_switch_configure(sw)) { 601 tb_switch_put(sw); 602 return; 603 } 604 605 /* 606 * If there was previously another domain connected remove it 607 * first. 608 */ 609 if (port->xdomain) { 610 tb_xdomain_remove(port->xdomain); 611 tb_port_unconfigure_xdomain(port); 612 port->xdomain = NULL; 613 } 614 615 /* 616 * Do not send uevents until we have discovered all existing 617 * tunnels and know which switches were authorized already by 618 * the boot firmware. 619 */ 620 if (!tcm->hotplug_active) 621 dev_set_uevent_suppress(&sw->dev, true); 622 623 /* 624 * At the moment Thunderbolt 2 and beyond (devices with LC) we 625 * can support runtime PM. 626 */ 627 sw->rpm = sw->generation > 1; 628 629 if (tb_switch_add(sw)) { 630 tb_switch_put(sw); 631 return; 632 } 633 634 /* Link the switches using both links if available */ 635 upstream_port = tb_upstream_port(sw); 636 port->remote = upstream_port; 637 upstream_port->remote = port; 638 if (port->dual_link_port && upstream_port->dual_link_port) { 639 port->dual_link_port->remote = upstream_port->dual_link_port; 640 upstream_port->dual_link_port->remote = port->dual_link_port; 641 } 642 643 /* Enable lane bonding if supported */ 644 tb_switch_lane_bonding_enable(sw); 645 /* Set the link configured */ 646 tb_switch_configure_link(sw); 647 648 if (tb_enable_tmu(sw)) 649 tb_sw_warn(sw, "failed to enable TMU\n"); 650 651 /* Scan upstream retimers */ 652 tb_retimer_scan(upstream_port); 653 654 /* 655 * Create USB 3.x tunnels only when the switch is plugged to the 656 * domain. This is because we scan the domain also during discovery 657 * and want to discover existing USB 3.x tunnels before we create 658 * any new. 659 */ 660 if (tcm->hotplug_active && tb_tunnel_usb3(sw->tb, sw)) 661 tb_sw_warn(sw, "USB3 tunnel creation failed\n"); 662 663 tb_add_dp_resources(sw); 664 tb_scan_switch(sw); 665 } 666 667 static void tb_deactivate_and_free_tunnel(struct tb_tunnel *tunnel) 668 { 669 struct tb_port *src_port, *dst_port; 670 struct tb *tb; 671 672 if (!tunnel) 673 return; 674 675 tb_tunnel_deactivate(tunnel); 676 list_del(&tunnel->list); 677 678 tb = tunnel->tb; 679 src_port = tunnel->src_port; 680 dst_port = tunnel->dst_port; 681 682 switch (tunnel->type) { 683 case TB_TUNNEL_DP: 684 /* 685 * In case of DP tunnel make sure the DP IN resource is 686 * deallocated properly. 687 */ 688 tb_switch_dealloc_dp_resource(src_port->sw, src_port); 689 /* Now we can allow the domain to runtime suspend again */ 690 pm_runtime_mark_last_busy(&dst_port->sw->dev); 691 pm_runtime_put_autosuspend(&dst_port->sw->dev); 692 pm_runtime_mark_last_busy(&src_port->sw->dev); 693 pm_runtime_put_autosuspend(&src_port->sw->dev); 694 fallthrough; 695 696 case TB_TUNNEL_USB3: 697 tb_reclaim_usb3_bandwidth(tb, src_port, dst_port); 698 break; 699 700 default: 701 /* 702 * PCIe and DMA tunnels do not consume guaranteed 703 * bandwidth. 704 */ 705 break; 706 } 707 708 tb_tunnel_free(tunnel); 709 } 710 711 /** 712 * tb_free_invalid_tunnels() - destroy tunnels of devices that have gone away 713 */ 714 static void tb_free_invalid_tunnels(struct tb *tb) 715 { 716 struct tb_cm *tcm = tb_priv(tb); 717 struct tb_tunnel *tunnel; 718 struct tb_tunnel *n; 719 720 list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { 721 if (tb_tunnel_is_invalid(tunnel)) 722 tb_deactivate_and_free_tunnel(tunnel); 723 } 724 } 725 726 /** 727 * tb_free_unplugged_children() - traverse hierarchy and free unplugged switches 728 */ 729 static void tb_free_unplugged_children(struct tb_switch *sw) 730 { 731 struct tb_port *port; 732 733 tb_switch_for_each_port(sw, port) { 734 if (!tb_port_has_remote(port)) 735 continue; 736 737 if (port->remote->sw->is_unplugged) { 738 tb_retimer_remove_all(port); 739 tb_remove_dp_resources(port->remote->sw); 740 tb_switch_unconfigure_link(port->remote->sw); 741 tb_switch_lane_bonding_disable(port->remote->sw); 742 tb_switch_remove(port->remote->sw); 743 port->remote = NULL; 744 if (port->dual_link_port) 745 port->dual_link_port->remote = NULL; 746 } else { 747 tb_free_unplugged_children(port->remote->sw); 748 } 749 } 750 } 751 752 static struct tb_port *tb_find_pcie_down(struct tb_switch *sw, 753 const struct tb_port *port) 754 { 755 struct tb_port *down = NULL; 756 757 /* 758 * To keep plugging devices consistently in the same PCIe 759 * hierarchy, do mapping here for switch downstream PCIe ports. 760 */ 761 if (tb_switch_is_usb4(sw)) { 762 down = usb4_switch_map_pcie_down(sw, port); 763 } else if (!tb_route(sw)) { 764 int phy_port = tb_phy_port_from_link(port->port); 765 int index; 766 767 /* 768 * Hard-coded Thunderbolt port to PCIe down port mapping 769 * per controller. 770 */ 771 if (tb_switch_is_cactus_ridge(sw) || 772 tb_switch_is_alpine_ridge(sw)) 773 index = !phy_port ? 6 : 7; 774 else if (tb_switch_is_falcon_ridge(sw)) 775 index = !phy_port ? 6 : 8; 776 else if (tb_switch_is_titan_ridge(sw)) 777 index = !phy_port ? 8 : 9; 778 else 779 goto out; 780 781 /* Validate the hard-coding */ 782 if (WARN_ON(index > sw->config.max_port_number)) 783 goto out; 784 785 down = &sw->ports[index]; 786 } 787 788 if (down) { 789 if (WARN_ON(!tb_port_is_pcie_down(down))) 790 goto out; 791 if (tb_pci_port_is_enabled(down)) 792 goto out; 793 794 return down; 795 } 796 797 out: 798 return tb_find_unused_port(sw, TB_TYPE_PCIE_DOWN); 799 } 800 801 static struct tb_port *tb_find_dp_out(struct tb *tb, struct tb_port *in) 802 { 803 struct tb_port *host_port, *port; 804 struct tb_cm *tcm = tb_priv(tb); 805 806 host_port = tb_route(in->sw) ? 807 tb_port_at(tb_route(in->sw), tb->root_switch) : NULL; 808 809 list_for_each_entry(port, &tcm->dp_resources, list) { 810 if (!tb_port_is_dpout(port)) 811 continue; 812 813 if (tb_port_is_enabled(port)) { 814 tb_port_dbg(port, "in use\n"); 815 continue; 816 } 817 818 tb_port_dbg(port, "DP OUT available\n"); 819 820 /* 821 * Keep the DP tunnel under the topology starting from 822 * the same host router downstream port. 823 */ 824 if (host_port && tb_route(port->sw)) { 825 struct tb_port *p; 826 827 p = tb_port_at(tb_route(port->sw), tb->root_switch); 828 if (p != host_port) 829 continue; 830 } 831 832 return port; 833 } 834 835 return NULL; 836 } 837 838 static void tb_tunnel_dp(struct tb *tb) 839 { 840 int available_up, available_down, ret; 841 struct tb_cm *tcm = tb_priv(tb); 842 struct tb_port *port, *in, *out; 843 struct tb_tunnel *tunnel; 844 845 /* 846 * Find pair of inactive DP IN and DP OUT adapters and then 847 * establish a DP tunnel between them. 848 */ 849 tb_dbg(tb, "looking for DP IN <-> DP OUT pairs:\n"); 850 851 in = NULL; 852 out = NULL; 853 list_for_each_entry(port, &tcm->dp_resources, list) { 854 if (!tb_port_is_dpin(port)) 855 continue; 856 857 if (tb_port_is_enabled(port)) { 858 tb_port_dbg(port, "in use\n"); 859 continue; 860 } 861 862 tb_port_dbg(port, "DP IN available\n"); 863 864 out = tb_find_dp_out(tb, port); 865 if (out) { 866 in = port; 867 break; 868 } 869 } 870 871 if (!in) { 872 tb_dbg(tb, "no suitable DP IN adapter available, not tunneling\n"); 873 return; 874 } 875 if (!out) { 876 tb_dbg(tb, "no suitable DP OUT adapter available, not tunneling\n"); 877 return; 878 } 879 880 /* 881 * DP stream needs the domain to be active so runtime resume 882 * both ends of the tunnel. 883 * 884 * This should bring the routers in the middle active as well 885 * and keeps the domain from runtime suspending while the DP 886 * tunnel is active. 887 */ 888 pm_runtime_get_sync(&in->sw->dev); 889 pm_runtime_get_sync(&out->sw->dev); 890 891 if (tb_switch_alloc_dp_resource(in->sw, in)) { 892 tb_port_dbg(in, "no resource available for DP IN, not tunneling\n"); 893 goto err_rpm_put; 894 } 895 896 /* Make all unused USB3 bandwidth available for the new DP tunnel */ 897 ret = tb_release_unused_usb3_bandwidth(tb, in, out); 898 if (ret) { 899 tb_warn(tb, "failed to release unused bandwidth\n"); 900 goto err_dealloc_dp; 901 } 902 903 ret = tb_available_bandwidth(tb, in, out, &available_up, 904 &available_down); 905 if (ret) 906 goto err_reclaim; 907 908 tb_dbg(tb, "available bandwidth for new DP tunnel %u/%u Mb/s\n", 909 available_up, available_down); 910 911 tunnel = tb_tunnel_alloc_dp(tb, in, out, available_up, available_down); 912 if (!tunnel) { 913 tb_port_dbg(out, "could not allocate DP tunnel\n"); 914 goto err_reclaim; 915 } 916 917 if (tb_tunnel_activate(tunnel)) { 918 tb_port_info(out, "DP tunnel activation failed, aborting\n"); 919 goto err_free; 920 } 921 922 list_add_tail(&tunnel->list, &tcm->tunnel_list); 923 tb_reclaim_usb3_bandwidth(tb, in, out); 924 return; 925 926 err_free: 927 tb_tunnel_free(tunnel); 928 err_reclaim: 929 tb_reclaim_usb3_bandwidth(tb, in, out); 930 err_dealloc_dp: 931 tb_switch_dealloc_dp_resource(in->sw, in); 932 err_rpm_put: 933 pm_runtime_mark_last_busy(&out->sw->dev); 934 pm_runtime_put_autosuspend(&out->sw->dev); 935 pm_runtime_mark_last_busy(&in->sw->dev); 936 pm_runtime_put_autosuspend(&in->sw->dev); 937 } 938 939 static void tb_dp_resource_unavailable(struct tb *tb, struct tb_port *port) 940 { 941 struct tb_port *in, *out; 942 struct tb_tunnel *tunnel; 943 944 if (tb_port_is_dpin(port)) { 945 tb_port_dbg(port, "DP IN resource unavailable\n"); 946 in = port; 947 out = NULL; 948 } else { 949 tb_port_dbg(port, "DP OUT resource unavailable\n"); 950 in = NULL; 951 out = port; 952 } 953 954 tunnel = tb_find_tunnel(tb, TB_TUNNEL_DP, in, out); 955 tb_deactivate_and_free_tunnel(tunnel); 956 list_del_init(&port->list); 957 958 /* 959 * See if there is another DP OUT port that can be used for 960 * to create another tunnel. 961 */ 962 tb_tunnel_dp(tb); 963 } 964 965 static void tb_dp_resource_available(struct tb *tb, struct tb_port *port) 966 { 967 struct tb_cm *tcm = tb_priv(tb); 968 struct tb_port *p; 969 970 if (tb_port_is_enabled(port)) 971 return; 972 973 list_for_each_entry(p, &tcm->dp_resources, list) { 974 if (p == port) 975 return; 976 } 977 978 tb_port_dbg(port, "DP %s resource available\n", 979 tb_port_is_dpin(port) ? "IN" : "OUT"); 980 list_add_tail(&port->list, &tcm->dp_resources); 981 982 /* Look for suitable DP IN <-> DP OUT pairs now */ 983 tb_tunnel_dp(tb); 984 } 985 986 static void tb_disconnect_and_release_dp(struct tb *tb) 987 { 988 struct tb_cm *tcm = tb_priv(tb); 989 struct tb_tunnel *tunnel, *n; 990 991 /* 992 * Tear down all DP tunnels and release their resources. They 993 * will be re-established after resume based on plug events. 994 */ 995 list_for_each_entry_safe_reverse(tunnel, n, &tcm->tunnel_list, list) { 996 if (tb_tunnel_is_dp(tunnel)) 997 tb_deactivate_and_free_tunnel(tunnel); 998 } 999 1000 while (!list_empty(&tcm->dp_resources)) { 1001 struct tb_port *port; 1002 1003 port = list_first_entry(&tcm->dp_resources, 1004 struct tb_port, list); 1005 list_del_init(&port->list); 1006 } 1007 } 1008 1009 static int tb_tunnel_pci(struct tb *tb, struct tb_switch *sw) 1010 { 1011 struct tb_port *up, *down, *port; 1012 struct tb_cm *tcm = tb_priv(tb); 1013 struct tb_switch *parent_sw; 1014 struct tb_tunnel *tunnel; 1015 1016 up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP); 1017 if (!up) 1018 return 0; 1019 1020 /* 1021 * Look up available down port. Since we are chaining it should 1022 * be found right above this switch. 1023 */ 1024 parent_sw = tb_to_switch(sw->dev.parent); 1025 port = tb_port_at(tb_route(sw), parent_sw); 1026 down = tb_find_pcie_down(parent_sw, port); 1027 if (!down) 1028 return 0; 1029 1030 tunnel = tb_tunnel_alloc_pci(tb, up, down); 1031 if (!tunnel) 1032 return -ENOMEM; 1033 1034 if (tb_tunnel_activate(tunnel)) { 1035 tb_port_info(up, 1036 "PCIe tunnel activation failed, aborting\n"); 1037 tb_tunnel_free(tunnel); 1038 return -EIO; 1039 } 1040 1041 list_add_tail(&tunnel->list, &tcm->tunnel_list); 1042 return 0; 1043 } 1044 1045 static int tb_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd) 1046 { 1047 struct tb_cm *tcm = tb_priv(tb); 1048 struct tb_port *nhi_port, *dst_port; 1049 struct tb_tunnel *tunnel; 1050 struct tb_switch *sw; 1051 1052 sw = tb_to_switch(xd->dev.parent); 1053 dst_port = tb_port_at(xd->route, sw); 1054 nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI); 1055 1056 mutex_lock(&tb->lock); 1057 tunnel = tb_tunnel_alloc_dma(tb, nhi_port, dst_port, xd->transmit_ring, 1058 xd->transmit_path, xd->receive_ring, 1059 xd->receive_path); 1060 if (!tunnel) { 1061 mutex_unlock(&tb->lock); 1062 return -ENOMEM; 1063 } 1064 1065 if (tb_tunnel_activate(tunnel)) { 1066 tb_port_info(nhi_port, 1067 "DMA tunnel activation failed, aborting\n"); 1068 tb_tunnel_free(tunnel); 1069 mutex_unlock(&tb->lock); 1070 return -EIO; 1071 } 1072 1073 list_add_tail(&tunnel->list, &tcm->tunnel_list); 1074 mutex_unlock(&tb->lock); 1075 return 0; 1076 } 1077 1078 static void __tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd) 1079 { 1080 struct tb_port *dst_port; 1081 struct tb_tunnel *tunnel; 1082 struct tb_switch *sw; 1083 1084 sw = tb_to_switch(xd->dev.parent); 1085 dst_port = tb_port_at(xd->route, sw); 1086 1087 /* 1088 * It is possible that the tunnel was already teared down (in 1089 * case of cable disconnect) so it is fine if we cannot find it 1090 * here anymore. 1091 */ 1092 tunnel = tb_find_tunnel(tb, TB_TUNNEL_DMA, NULL, dst_port); 1093 tb_deactivate_and_free_tunnel(tunnel); 1094 } 1095 1096 static int tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd) 1097 { 1098 if (!xd->is_unplugged) { 1099 mutex_lock(&tb->lock); 1100 __tb_disconnect_xdomain_paths(tb, xd); 1101 mutex_unlock(&tb->lock); 1102 } 1103 return 0; 1104 } 1105 1106 /* hotplug handling */ 1107 1108 /** 1109 * tb_handle_hotplug() - handle hotplug event 1110 * 1111 * Executes on tb->wq. 1112 */ 1113 static void tb_handle_hotplug(struct work_struct *work) 1114 { 1115 struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work); 1116 struct tb *tb = ev->tb; 1117 struct tb_cm *tcm = tb_priv(tb); 1118 struct tb_switch *sw; 1119 struct tb_port *port; 1120 1121 /* Bring the domain back from sleep if it was suspended */ 1122 pm_runtime_get_sync(&tb->dev); 1123 1124 mutex_lock(&tb->lock); 1125 if (!tcm->hotplug_active) 1126 goto out; /* during init, suspend or shutdown */ 1127 1128 sw = tb_switch_find_by_route(tb, ev->route); 1129 if (!sw) { 1130 tb_warn(tb, 1131 "hotplug event from non existent switch %llx:%x (unplug: %d)\n", 1132 ev->route, ev->port, ev->unplug); 1133 goto out; 1134 } 1135 if (ev->port > sw->config.max_port_number) { 1136 tb_warn(tb, 1137 "hotplug event from non existent port %llx:%x (unplug: %d)\n", 1138 ev->route, ev->port, ev->unplug); 1139 goto put_sw; 1140 } 1141 port = &sw->ports[ev->port]; 1142 if (tb_is_upstream_port(port)) { 1143 tb_dbg(tb, "hotplug event for upstream port %llx:%x (unplug: %d)\n", 1144 ev->route, ev->port, ev->unplug); 1145 goto put_sw; 1146 } 1147 1148 pm_runtime_get_sync(&sw->dev); 1149 1150 if (ev->unplug) { 1151 tb_retimer_remove_all(port); 1152 1153 if (tb_port_has_remote(port)) { 1154 tb_port_dbg(port, "switch unplugged\n"); 1155 tb_sw_set_unplugged(port->remote->sw); 1156 tb_free_invalid_tunnels(tb); 1157 tb_remove_dp_resources(port->remote->sw); 1158 tb_switch_tmu_disable(port->remote->sw); 1159 tb_switch_unconfigure_link(port->remote->sw); 1160 tb_switch_lane_bonding_disable(port->remote->sw); 1161 tb_switch_remove(port->remote->sw); 1162 port->remote = NULL; 1163 if (port->dual_link_port) 1164 port->dual_link_port->remote = NULL; 1165 /* Maybe we can create another DP tunnel */ 1166 tb_tunnel_dp(tb); 1167 } else if (port->xdomain) { 1168 struct tb_xdomain *xd = tb_xdomain_get(port->xdomain); 1169 1170 tb_port_dbg(port, "xdomain unplugged\n"); 1171 /* 1172 * Service drivers are unbound during 1173 * tb_xdomain_remove() so setting XDomain as 1174 * unplugged here prevents deadlock if they call 1175 * tb_xdomain_disable_paths(). We will tear down 1176 * the path below. 1177 */ 1178 xd->is_unplugged = true; 1179 tb_xdomain_remove(xd); 1180 port->xdomain = NULL; 1181 __tb_disconnect_xdomain_paths(tb, xd); 1182 tb_xdomain_put(xd); 1183 tb_port_unconfigure_xdomain(port); 1184 } else if (tb_port_is_dpout(port) || tb_port_is_dpin(port)) { 1185 tb_dp_resource_unavailable(tb, port); 1186 } else { 1187 tb_port_dbg(port, 1188 "got unplug event for disconnected port, ignoring\n"); 1189 } 1190 } else if (port->remote) { 1191 tb_port_dbg(port, "got plug event for connected port, ignoring\n"); 1192 } else { 1193 if (tb_port_is_null(port)) { 1194 tb_port_dbg(port, "hotplug: scanning\n"); 1195 tb_scan_port(port); 1196 if (!port->remote) 1197 tb_port_dbg(port, "hotplug: no switch found\n"); 1198 } else if (tb_port_is_dpout(port) || tb_port_is_dpin(port)) { 1199 tb_dp_resource_available(tb, port); 1200 } 1201 } 1202 1203 pm_runtime_mark_last_busy(&sw->dev); 1204 pm_runtime_put_autosuspend(&sw->dev); 1205 1206 put_sw: 1207 tb_switch_put(sw); 1208 out: 1209 mutex_unlock(&tb->lock); 1210 1211 pm_runtime_mark_last_busy(&tb->dev); 1212 pm_runtime_put_autosuspend(&tb->dev); 1213 1214 kfree(ev); 1215 } 1216 1217 /** 1218 * tb_schedule_hotplug_handler() - callback function for the control channel 1219 * 1220 * Delegates to tb_handle_hotplug. 1221 */ 1222 static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type, 1223 const void *buf, size_t size) 1224 { 1225 const struct cfg_event_pkg *pkg = buf; 1226 u64 route; 1227 1228 if (type != TB_CFG_PKG_EVENT) { 1229 tb_warn(tb, "unexpected event %#x, ignoring\n", type); 1230 return; 1231 } 1232 1233 route = tb_cfg_get_route(&pkg->header); 1234 1235 if (tb_cfg_ack_plug(tb->ctl, route, pkg->port, pkg->unplug)) { 1236 tb_warn(tb, "could not ack plug event on %llx:%x\n", route, 1237 pkg->port); 1238 } 1239 1240 tb_queue_hotplug(tb, route, pkg->port, pkg->unplug); 1241 } 1242 1243 static void tb_stop(struct tb *tb) 1244 { 1245 struct tb_cm *tcm = tb_priv(tb); 1246 struct tb_tunnel *tunnel; 1247 struct tb_tunnel *n; 1248 1249 cancel_delayed_work(&tcm->remove_work); 1250 /* tunnels are only present after everything has been initialized */ 1251 list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { 1252 /* 1253 * DMA tunnels require the driver to be functional so we 1254 * tear them down. Other protocol tunnels can be left 1255 * intact. 1256 */ 1257 if (tb_tunnel_is_dma(tunnel)) 1258 tb_tunnel_deactivate(tunnel); 1259 tb_tunnel_free(tunnel); 1260 } 1261 tb_switch_remove(tb->root_switch); 1262 tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ 1263 } 1264 1265 static int tb_scan_finalize_switch(struct device *dev, void *data) 1266 { 1267 if (tb_is_switch(dev)) { 1268 struct tb_switch *sw = tb_to_switch(dev); 1269 1270 /* 1271 * If we found that the switch was already setup by the 1272 * boot firmware, mark it as authorized now before we 1273 * send uevent to userspace. 1274 */ 1275 if (sw->boot) 1276 sw->authorized = 1; 1277 1278 dev_set_uevent_suppress(dev, false); 1279 kobject_uevent(&dev->kobj, KOBJ_ADD); 1280 device_for_each_child(dev, NULL, tb_scan_finalize_switch); 1281 } 1282 1283 return 0; 1284 } 1285 1286 static int tb_start(struct tb *tb) 1287 { 1288 struct tb_cm *tcm = tb_priv(tb); 1289 int ret; 1290 1291 tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0); 1292 if (IS_ERR(tb->root_switch)) 1293 return PTR_ERR(tb->root_switch); 1294 1295 /* 1296 * ICM firmware upgrade needs running firmware and in native 1297 * mode that is not available so disable firmware upgrade of the 1298 * root switch. 1299 */ 1300 tb->root_switch->no_nvm_upgrade = true; 1301 /* All USB4 routers support runtime PM */ 1302 tb->root_switch->rpm = tb_switch_is_usb4(tb->root_switch); 1303 1304 ret = tb_switch_configure(tb->root_switch); 1305 if (ret) { 1306 tb_switch_put(tb->root_switch); 1307 return ret; 1308 } 1309 1310 /* Announce the switch to the world */ 1311 ret = tb_switch_add(tb->root_switch); 1312 if (ret) { 1313 tb_switch_put(tb->root_switch); 1314 return ret; 1315 } 1316 1317 /* Enable TMU if it is off */ 1318 tb_switch_tmu_enable(tb->root_switch); 1319 /* Full scan to discover devices added before the driver was loaded. */ 1320 tb_scan_switch(tb->root_switch); 1321 /* Find out tunnels created by the boot firmware */ 1322 tb_discover_tunnels(tb->root_switch); 1323 /* 1324 * If the boot firmware did not create USB 3.x tunnels create them 1325 * now for the whole topology. 1326 */ 1327 tb_create_usb3_tunnels(tb->root_switch); 1328 /* Add DP IN resources for the root switch */ 1329 tb_add_dp_resources(tb->root_switch); 1330 /* Make the discovered switches available to the userspace */ 1331 device_for_each_child(&tb->root_switch->dev, NULL, 1332 tb_scan_finalize_switch); 1333 1334 /* Allow tb_handle_hotplug to progress events */ 1335 tcm->hotplug_active = true; 1336 return 0; 1337 } 1338 1339 static int tb_suspend_noirq(struct tb *tb) 1340 { 1341 struct tb_cm *tcm = tb_priv(tb); 1342 1343 tb_dbg(tb, "suspending...\n"); 1344 tb_disconnect_and_release_dp(tb); 1345 tb_switch_suspend(tb->root_switch, false); 1346 tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ 1347 tb_dbg(tb, "suspend finished\n"); 1348 1349 return 0; 1350 } 1351 1352 static void tb_restore_children(struct tb_switch *sw) 1353 { 1354 struct tb_port *port; 1355 1356 /* No need to restore if the router is already unplugged */ 1357 if (sw->is_unplugged) 1358 return; 1359 1360 if (tb_enable_tmu(sw)) 1361 tb_sw_warn(sw, "failed to restore TMU configuration\n"); 1362 1363 tb_switch_for_each_port(sw, port) { 1364 if (!tb_port_has_remote(port) && !port->xdomain) 1365 continue; 1366 1367 if (port->remote) { 1368 tb_switch_lane_bonding_enable(port->remote->sw); 1369 tb_switch_configure_link(port->remote->sw); 1370 1371 tb_restore_children(port->remote->sw); 1372 } else if (port->xdomain) { 1373 tb_port_configure_xdomain(port); 1374 } 1375 } 1376 } 1377 1378 static int tb_resume_noirq(struct tb *tb) 1379 { 1380 struct tb_cm *tcm = tb_priv(tb); 1381 struct tb_tunnel *tunnel, *n; 1382 1383 tb_dbg(tb, "resuming...\n"); 1384 1385 /* remove any pci devices the firmware might have setup */ 1386 tb_switch_reset(tb->root_switch); 1387 1388 tb_switch_resume(tb->root_switch); 1389 tb_free_invalid_tunnels(tb); 1390 tb_free_unplugged_children(tb->root_switch); 1391 tb_restore_children(tb->root_switch); 1392 list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) 1393 tb_tunnel_restart(tunnel); 1394 if (!list_empty(&tcm->tunnel_list)) { 1395 /* 1396 * the pcie links need some time to get going. 1397 * 100ms works for me... 1398 */ 1399 tb_dbg(tb, "tunnels restarted, sleeping for 100ms\n"); 1400 msleep(100); 1401 } 1402 /* Allow tb_handle_hotplug to progress events */ 1403 tcm->hotplug_active = true; 1404 tb_dbg(tb, "resume finished\n"); 1405 1406 return 0; 1407 } 1408 1409 static int tb_free_unplugged_xdomains(struct tb_switch *sw) 1410 { 1411 struct tb_port *port; 1412 int ret = 0; 1413 1414 tb_switch_for_each_port(sw, port) { 1415 if (tb_is_upstream_port(port)) 1416 continue; 1417 if (port->xdomain && port->xdomain->is_unplugged) { 1418 tb_retimer_remove_all(port); 1419 tb_xdomain_remove(port->xdomain); 1420 tb_port_unconfigure_xdomain(port); 1421 port->xdomain = NULL; 1422 ret++; 1423 } else if (port->remote) { 1424 ret += tb_free_unplugged_xdomains(port->remote->sw); 1425 } 1426 } 1427 1428 return ret; 1429 } 1430 1431 static int tb_freeze_noirq(struct tb *tb) 1432 { 1433 struct tb_cm *tcm = tb_priv(tb); 1434 1435 tcm->hotplug_active = false; 1436 return 0; 1437 } 1438 1439 static int tb_thaw_noirq(struct tb *tb) 1440 { 1441 struct tb_cm *tcm = tb_priv(tb); 1442 1443 tcm->hotplug_active = true; 1444 return 0; 1445 } 1446 1447 static void tb_complete(struct tb *tb) 1448 { 1449 /* 1450 * Release any unplugged XDomains and if there is a case where 1451 * another domain is swapped in place of unplugged XDomain we 1452 * need to run another rescan. 1453 */ 1454 mutex_lock(&tb->lock); 1455 if (tb_free_unplugged_xdomains(tb->root_switch)) 1456 tb_scan_switch(tb->root_switch); 1457 mutex_unlock(&tb->lock); 1458 } 1459 1460 static int tb_runtime_suspend(struct tb *tb) 1461 { 1462 struct tb_cm *tcm = tb_priv(tb); 1463 1464 mutex_lock(&tb->lock); 1465 tb_switch_suspend(tb->root_switch, true); 1466 tcm->hotplug_active = false; 1467 mutex_unlock(&tb->lock); 1468 1469 return 0; 1470 } 1471 1472 static void tb_remove_work(struct work_struct *work) 1473 { 1474 struct tb_cm *tcm = container_of(work, struct tb_cm, remove_work.work); 1475 struct tb *tb = tcm_to_tb(tcm); 1476 1477 mutex_lock(&tb->lock); 1478 if (tb->root_switch) { 1479 tb_free_unplugged_children(tb->root_switch); 1480 tb_free_unplugged_xdomains(tb->root_switch); 1481 } 1482 mutex_unlock(&tb->lock); 1483 } 1484 1485 static int tb_runtime_resume(struct tb *tb) 1486 { 1487 struct tb_cm *tcm = tb_priv(tb); 1488 struct tb_tunnel *tunnel, *n; 1489 1490 mutex_lock(&tb->lock); 1491 tb_switch_resume(tb->root_switch); 1492 tb_free_invalid_tunnels(tb); 1493 tb_restore_children(tb->root_switch); 1494 list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) 1495 tb_tunnel_restart(tunnel); 1496 tcm->hotplug_active = true; 1497 mutex_unlock(&tb->lock); 1498 1499 /* 1500 * Schedule cleanup of any unplugged devices. Run this in a 1501 * separate thread to avoid possible deadlock if the device 1502 * removal runtime resumes the unplugged device. 1503 */ 1504 queue_delayed_work(tb->wq, &tcm->remove_work, msecs_to_jiffies(50)); 1505 return 0; 1506 } 1507 1508 static const struct tb_cm_ops tb_cm_ops = { 1509 .start = tb_start, 1510 .stop = tb_stop, 1511 .suspend_noirq = tb_suspend_noirq, 1512 .resume_noirq = tb_resume_noirq, 1513 .freeze_noirq = tb_freeze_noirq, 1514 .thaw_noirq = tb_thaw_noirq, 1515 .complete = tb_complete, 1516 .runtime_suspend = tb_runtime_suspend, 1517 .runtime_resume = tb_runtime_resume, 1518 .handle_event = tb_handle_event, 1519 .approve_switch = tb_tunnel_pci, 1520 .approve_xdomain_paths = tb_approve_xdomain_paths, 1521 .disconnect_xdomain_paths = tb_disconnect_xdomain_paths, 1522 }; 1523 1524 struct tb *tb_probe(struct tb_nhi *nhi) 1525 { 1526 struct tb_cm *tcm; 1527 struct tb *tb; 1528 1529 tb = tb_domain_alloc(nhi, sizeof(*tcm)); 1530 if (!tb) 1531 return NULL; 1532 1533 tb->security_level = TB_SECURITY_USER; 1534 tb->cm_ops = &tb_cm_ops; 1535 1536 tcm = tb_priv(tb); 1537 INIT_LIST_HEAD(&tcm->tunnel_list); 1538 INIT_LIST_HEAD(&tcm->dp_resources); 1539 INIT_DELAYED_WORK(&tcm->remove_work, tb_remove_work); 1540 1541 return tb; 1542 } 1543