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 #include <linux/platform_data/x86/apple.h> 14 15 #include "tb.h" 16 #include "tb_regs.h" 17 #include "tunnel.h" 18 19 #define TB_TIMEOUT 100 /* ms */ 20 21 /** 22 * struct tb_cm - Simple Thunderbolt connection manager 23 * @tunnel_list: List of active tunnels 24 * @dp_resources: List of available DP resources for DP tunneling 25 * @hotplug_active: tb_handle_hotplug will stop progressing plug 26 * events and exit if this is not set (it needs to 27 * acquire the lock one more time). Used to drain wq 28 * after cfg has been paused. 29 * @remove_work: Work used to remove any unplugged routers after 30 * runtime resume 31 */ 32 struct tb_cm { 33 struct list_head tunnel_list; 34 struct list_head dp_resources; 35 bool hotplug_active; 36 struct delayed_work remove_work; 37 }; 38 39 static inline struct tb *tcm_to_tb(struct tb_cm *tcm) 40 { 41 return ((void *)tcm - sizeof(struct tb)); 42 } 43 44 struct tb_hotplug_event { 45 struct work_struct work; 46 struct tb *tb; 47 u64 route; 48 u8 port; 49 bool unplug; 50 }; 51 52 static void tb_handle_hotplug(struct work_struct *work); 53 54 static void tb_queue_hotplug(struct tb *tb, u64 route, u8 port, bool unplug) 55 { 56 struct tb_hotplug_event *ev; 57 58 ev = kmalloc(sizeof(*ev), GFP_KERNEL); 59 if (!ev) 60 return; 61 62 ev->tb = tb; 63 ev->route = route; 64 ev->port = port; 65 ev->unplug = unplug; 66 INIT_WORK(&ev->work, tb_handle_hotplug); 67 queue_work(tb->wq, &ev->work); 68 } 69 70 /* enumeration & hot plug handling */ 71 72 static void tb_add_dp_resources(struct tb_switch *sw) 73 { 74 struct tb_cm *tcm = tb_priv(sw->tb); 75 struct tb_port *port; 76 77 tb_switch_for_each_port(sw, port) { 78 if (!tb_port_is_dpin(port)) 79 continue; 80 81 if (!tb_switch_query_dp_resource(sw, port)) 82 continue; 83 84 list_add_tail(&port->list, &tcm->dp_resources); 85 tb_port_dbg(port, "DP IN resource available\n"); 86 } 87 } 88 89 static void tb_remove_dp_resources(struct tb_switch *sw) 90 { 91 struct tb_cm *tcm = tb_priv(sw->tb); 92 struct tb_port *port, *tmp; 93 94 /* Clear children resources first */ 95 tb_switch_for_each_port(sw, port) { 96 if (tb_port_has_remote(port)) 97 tb_remove_dp_resources(port->remote->sw); 98 } 99 100 list_for_each_entry_safe(port, tmp, &tcm->dp_resources, list) { 101 if (port->sw == sw) { 102 tb_port_dbg(port, "DP OUT resource unavailable\n"); 103 list_del_init(&port->list); 104 } 105 } 106 } 107 108 static void tb_discover_tunnels(struct tb_switch *sw) 109 { 110 struct tb *tb = sw->tb; 111 struct tb_cm *tcm = tb_priv(tb); 112 struct tb_port *port; 113 114 tb_switch_for_each_port(sw, port) { 115 struct tb_tunnel *tunnel = NULL; 116 117 switch (port->config.type) { 118 case TB_TYPE_DP_HDMI_IN: 119 tunnel = tb_tunnel_discover_dp(tb, port); 120 break; 121 122 case TB_TYPE_PCIE_DOWN: 123 tunnel = tb_tunnel_discover_pci(tb, port); 124 break; 125 126 case TB_TYPE_USB3_DOWN: 127 tunnel = tb_tunnel_discover_usb3(tb, port); 128 break; 129 130 default: 131 break; 132 } 133 134 if (!tunnel) 135 continue; 136 137 if (tb_tunnel_is_pci(tunnel)) { 138 struct tb_switch *parent = tunnel->dst_port->sw; 139 140 while (parent != tunnel->src_port->sw) { 141 parent->boot = true; 142 parent = tb_switch_parent(parent); 143 } 144 } else if (tb_tunnel_is_dp(tunnel)) { 145 /* Keep the domain from powering down */ 146 pm_runtime_get_sync(&tunnel->src_port->sw->dev); 147 pm_runtime_get_sync(&tunnel->dst_port->sw->dev); 148 } 149 150 list_add_tail(&tunnel->list, &tcm->tunnel_list); 151 } 152 153 tb_switch_for_each_port(sw, port) { 154 if (tb_port_has_remote(port)) 155 tb_discover_tunnels(port->remote->sw); 156 } 157 } 158 159 static int tb_port_configure_xdomain(struct tb_port *port) 160 { 161 /* 162 * XDomain paths currently only support single lane so we must 163 * disable the other lane according to USB4 spec. 164 */ 165 tb_port_disable(port->dual_link_port); 166 167 if (tb_switch_is_usb4(port->sw)) 168 return usb4_port_configure_xdomain(port); 169 return tb_lc_configure_xdomain(port); 170 } 171 172 static void tb_port_unconfigure_xdomain(struct tb_port *port) 173 { 174 if (tb_switch_is_usb4(port->sw)) 175 usb4_port_unconfigure_xdomain(port); 176 else 177 tb_lc_unconfigure_xdomain(port); 178 179 tb_port_enable(port->dual_link_port); 180 } 181 182 static void tb_scan_xdomain(struct tb_port *port) 183 { 184 struct tb_switch *sw = port->sw; 185 struct tb *tb = sw->tb; 186 struct tb_xdomain *xd; 187 u64 route; 188 189 if (!tb_is_xdomain_enabled()) 190 return; 191 192 route = tb_downstream_route(port); 193 xd = tb_xdomain_find_by_route(tb, route); 194 if (xd) { 195 tb_xdomain_put(xd); 196 return; 197 } 198 199 xd = tb_xdomain_alloc(tb, &sw->dev, route, tb->root_switch->uuid, 200 NULL); 201 if (xd) { 202 tb_port_at(route, sw)->xdomain = xd; 203 tb_port_configure_xdomain(port); 204 tb_xdomain_add(xd); 205 } 206 } 207 208 static int tb_enable_tmu(struct tb_switch *sw) 209 { 210 int ret; 211 212 /* If it is already enabled in correct mode, don't touch it */ 213 if (tb_switch_tmu_is_enabled(sw)) 214 return 0; 215 216 ret = tb_switch_tmu_disable(sw); 217 if (ret) 218 return ret; 219 220 ret = tb_switch_tmu_post_time(sw); 221 if (ret) 222 return ret; 223 224 return tb_switch_tmu_enable(sw); 225 } 226 227 /** 228 * tb_find_unused_port() - return the first inactive port on @sw 229 * @sw: Switch to find the port on 230 * @type: Port type to look for 231 */ 232 static struct tb_port *tb_find_unused_port(struct tb_switch *sw, 233 enum tb_port_type type) 234 { 235 struct tb_port *port; 236 237 tb_switch_for_each_port(sw, port) { 238 if (tb_is_upstream_port(port)) 239 continue; 240 if (port->config.type != type) 241 continue; 242 if (!port->cap_adap) 243 continue; 244 if (tb_port_is_enabled(port)) 245 continue; 246 return port; 247 } 248 return NULL; 249 } 250 251 static struct tb_port *tb_find_usb3_down(struct tb_switch *sw, 252 const struct tb_port *port) 253 { 254 struct tb_port *down; 255 256 down = usb4_switch_map_usb3_down(sw, port); 257 if (down && !tb_usb3_port_is_enabled(down)) 258 return down; 259 return NULL; 260 } 261 262 static struct tb_tunnel *tb_find_tunnel(struct tb *tb, enum tb_tunnel_type type, 263 struct tb_port *src_port, 264 struct tb_port *dst_port) 265 { 266 struct tb_cm *tcm = tb_priv(tb); 267 struct tb_tunnel *tunnel; 268 269 list_for_each_entry(tunnel, &tcm->tunnel_list, list) { 270 if (tunnel->type == type && 271 ((src_port && src_port == tunnel->src_port) || 272 (dst_port && dst_port == tunnel->dst_port))) { 273 return tunnel; 274 } 275 } 276 277 return NULL; 278 } 279 280 static struct tb_tunnel *tb_find_first_usb3_tunnel(struct tb *tb, 281 struct tb_port *src_port, 282 struct tb_port *dst_port) 283 { 284 struct tb_port *port, *usb3_down; 285 struct tb_switch *sw; 286 287 /* Pick the router that is deepest in the topology */ 288 if (dst_port->sw->config.depth > src_port->sw->config.depth) 289 sw = dst_port->sw; 290 else 291 sw = src_port->sw; 292 293 /* Can't be the host router */ 294 if (sw == tb->root_switch) 295 return NULL; 296 297 /* Find the downstream USB4 port that leads to this router */ 298 port = tb_port_at(tb_route(sw), tb->root_switch); 299 /* Find the corresponding host router USB3 downstream port */ 300 usb3_down = usb4_switch_map_usb3_down(tb->root_switch, port); 301 if (!usb3_down) 302 return NULL; 303 304 return tb_find_tunnel(tb, TB_TUNNEL_USB3, usb3_down, NULL); 305 } 306 307 static int tb_available_bandwidth(struct tb *tb, struct tb_port *src_port, 308 struct tb_port *dst_port, int *available_up, int *available_down) 309 { 310 int usb3_consumed_up, usb3_consumed_down, ret; 311 struct tb_cm *tcm = tb_priv(tb); 312 struct tb_tunnel *tunnel; 313 struct tb_port *port; 314 315 tb_port_dbg(dst_port, "calculating available bandwidth\n"); 316 317 tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); 318 if (tunnel) { 319 ret = tb_tunnel_consumed_bandwidth(tunnel, &usb3_consumed_up, 320 &usb3_consumed_down); 321 if (ret) 322 return ret; 323 } else { 324 usb3_consumed_up = 0; 325 usb3_consumed_down = 0; 326 } 327 328 *available_up = *available_down = 40000; 329 330 /* Find the minimum available bandwidth over all links */ 331 tb_for_each_port_on_path(src_port, dst_port, port) { 332 int link_speed, link_width, up_bw, down_bw; 333 334 if (!tb_port_is_null(port)) 335 continue; 336 337 if (tb_is_upstream_port(port)) { 338 link_speed = port->sw->link_speed; 339 } else { 340 link_speed = tb_port_get_link_speed(port); 341 if (link_speed < 0) 342 return link_speed; 343 } 344 345 link_width = port->bonded ? 2 : 1; 346 347 up_bw = link_speed * link_width * 1000; /* Mb/s */ 348 /* Leave 10% guard band */ 349 up_bw -= up_bw / 10; 350 down_bw = up_bw; 351 352 tb_port_dbg(port, "link total bandwidth %d Mb/s\n", up_bw); 353 354 /* 355 * Find all DP tunnels that cross the port and reduce 356 * their consumed bandwidth from the available. 357 */ 358 list_for_each_entry(tunnel, &tcm->tunnel_list, list) { 359 int dp_consumed_up, dp_consumed_down; 360 361 if (!tb_tunnel_is_dp(tunnel)) 362 continue; 363 364 if (!tb_tunnel_port_on_path(tunnel, port)) 365 continue; 366 367 ret = tb_tunnel_consumed_bandwidth(tunnel, 368 &dp_consumed_up, 369 &dp_consumed_down); 370 if (ret) 371 return ret; 372 373 up_bw -= dp_consumed_up; 374 down_bw -= dp_consumed_down; 375 } 376 377 /* 378 * If USB3 is tunneled from the host router down to the 379 * branch leading to port we need to take USB3 consumed 380 * bandwidth into account regardless whether it actually 381 * crosses the port. 382 */ 383 up_bw -= usb3_consumed_up; 384 down_bw -= usb3_consumed_down; 385 386 if (up_bw < *available_up) 387 *available_up = up_bw; 388 if (down_bw < *available_down) 389 *available_down = down_bw; 390 } 391 392 if (*available_up < 0) 393 *available_up = 0; 394 if (*available_down < 0) 395 *available_down = 0; 396 397 return 0; 398 } 399 400 static int tb_release_unused_usb3_bandwidth(struct tb *tb, 401 struct tb_port *src_port, 402 struct tb_port *dst_port) 403 { 404 struct tb_tunnel *tunnel; 405 406 tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); 407 return tunnel ? tb_tunnel_release_unused_bandwidth(tunnel) : 0; 408 } 409 410 static void tb_reclaim_usb3_bandwidth(struct tb *tb, struct tb_port *src_port, 411 struct tb_port *dst_port) 412 { 413 int ret, available_up, available_down; 414 struct tb_tunnel *tunnel; 415 416 tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); 417 if (!tunnel) 418 return; 419 420 tb_dbg(tb, "reclaiming unused bandwidth for USB3\n"); 421 422 /* 423 * Calculate available bandwidth for the first hop USB3 tunnel. 424 * That determines the whole USB3 bandwidth for this branch. 425 */ 426 ret = tb_available_bandwidth(tb, tunnel->src_port, tunnel->dst_port, 427 &available_up, &available_down); 428 if (ret) { 429 tb_warn(tb, "failed to calculate available bandwidth\n"); 430 return; 431 } 432 433 tb_dbg(tb, "available bandwidth for USB3 %d/%d Mb/s\n", 434 available_up, available_down); 435 436 tb_tunnel_reclaim_available_bandwidth(tunnel, &available_up, &available_down); 437 } 438 439 static int tb_tunnel_usb3(struct tb *tb, struct tb_switch *sw) 440 { 441 struct tb_switch *parent = tb_switch_parent(sw); 442 int ret, available_up, available_down; 443 struct tb_port *up, *down, *port; 444 struct tb_cm *tcm = tb_priv(tb); 445 struct tb_tunnel *tunnel; 446 447 if (!tb_acpi_may_tunnel_usb3()) { 448 tb_dbg(tb, "USB3 tunneling disabled, not creating tunnel\n"); 449 return 0; 450 } 451 452 up = tb_switch_find_port(sw, TB_TYPE_USB3_UP); 453 if (!up) 454 return 0; 455 456 if (!sw->link_usb4) 457 return 0; 458 459 /* 460 * Look up available down port. Since we are chaining it should 461 * be found right above this switch. 462 */ 463 port = tb_port_at(tb_route(sw), parent); 464 down = tb_find_usb3_down(parent, port); 465 if (!down) 466 return 0; 467 468 if (tb_route(parent)) { 469 struct tb_port *parent_up; 470 /* 471 * Check first that the parent switch has its upstream USB3 472 * port enabled. Otherwise the chain is not complete and 473 * there is no point setting up a new tunnel. 474 */ 475 parent_up = tb_switch_find_port(parent, TB_TYPE_USB3_UP); 476 if (!parent_up || !tb_port_is_enabled(parent_up)) 477 return 0; 478 479 /* Make all unused bandwidth available for the new tunnel */ 480 ret = tb_release_unused_usb3_bandwidth(tb, down, up); 481 if (ret) 482 return ret; 483 } 484 485 ret = tb_available_bandwidth(tb, down, up, &available_up, 486 &available_down); 487 if (ret) 488 goto err_reclaim; 489 490 tb_port_dbg(up, "available bandwidth for new USB3 tunnel %d/%d Mb/s\n", 491 available_up, available_down); 492 493 tunnel = tb_tunnel_alloc_usb3(tb, up, down, available_up, 494 available_down); 495 if (!tunnel) { 496 ret = -ENOMEM; 497 goto err_reclaim; 498 } 499 500 if (tb_tunnel_activate(tunnel)) { 501 tb_port_info(up, 502 "USB3 tunnel activation failed, aborting\n"); 503 ret = -EIO; 504 goto err_free; 505 } 506 507 list_add_tail(&tunnel->list, &tcm->tunnel_list); 508 if (tb_route(parent)) 509 tb_reclaim_usb3_bandwidth(tb, down, up); 510 511 return 0; 512 513 err_free: 514 tb_tunnel_free(tunnel); 515 err_reclaim: 516 if (tb_route(parent)) 517 tb_reclaim_usb3_bandwidth(tb, down, up); 518 519 return ret; 520 } 521 522 static int tb_create_usb3_tunnels(struct tb_switch *sw) 523 { 524 struct tb_port *port; 525 int ret; 526 527 if (!tb_acpi_may_tunnel_usb3()) 528 return 0; 529 530 if (tb_route(sw)) { 531 ret = tb_tunnel_usb3(sw->tb, sw); 532 if (ret) 533 return ret; 534 } 535 536 tb_switch_for_each_port(sw, port) { 537 if (!tb_port_has_remote(port)) 538 continue; 539 ret = tb_create_usb3_tunnels(port->remote->sw); 540 if (ret) 541 return ret; 542 } 543 544 return 0; 545 } 546 547 static void tb_scan_port(struct tb_port *port); 548 549 /* 550 * tb_scan_switch() - scan for and initialize downstream switches 551 */ 552 static void tb_scan_switch(struct tb_switch *sw) 553 { 554 struct tb_port *port; 555 556 pm_runtime_get_sync(&sw->dev); 557 558 tb_switch_for_each_port(sw, port) 559 tb_scan_port(port); 560 561 pm_runtime_mark_last_busy(&sw->dev); 562 pm_runtime_put_autosuspend(&sw->dev); 563 } 564 565 /* 566 * tb_scan_port() - check for and initialize switches below port 567 */ 568 static void tb_scan_port(struct tb_port *port) 569 { 570 struct tb_cm *tcm = tb_priv(port->sw->tb); 571 struct tb_port *upstream_port; 572 struct tb_switch *sw; 573 574 if (tb_is_upstream_port(port)) 575 return; 576 577 if (tb_port_is_dpout(port) && tb_dp_port_hpd_is_active(port) == 1 && 578 !tb_dp_port_is_enabled(port)) { 579 tb_port_dbg(port, "DP adapter HPD set, queuing hotplug\n"); 580 tb_queue_hotplug(port->sw->tb, tb_route(port->sw), port->port, 581 false); 582 return; 583 } 584 585 if (port->config.type != TB_TYPE_PORT) 586 return; 587 if (port->dual_link_port && port->link_nr) 588 return; /* 589 * Downstream switch is reachable through two ports. 590 * Only scan on the primary port (link_nr == 0). 591 */ 592 if (tb_wait_for_port(port, false) <= 0) 593 return; 594 if (port->remote) { 595 tb_port_dbg(port, "port already has a remote\n"); 596 return; 597 } 598 599 tb_retimer_scan(port, true); 600 601 sw = tb_switch_alloc(port->sw->tb, &port->sw->dev, 602 tb_downstream_route(port)); 603 if (IS_ERR(sw)) { 604 /* 605 * If there is an error accessing the connected switch 606 * it may be connected to another domain. Also we allow 607 * the other domain to be connected to a max depth switch. 608 */ 609 if (PTR_ERR(sw) == -EIO || PTR_ERR(sw) == -EADDRNOTAVAIL) 610 tb_scan_xdomain(port); 611 return; 612 } 613 614 if (tb_switch_configure(sw)) { 615 tb_switch_put(sw); 616 return; 617 } 618 619 /* 620 * If there was previously another domain connected remove it 621 * first. 622 */ 623 if (port->xdomain) { 624 tb_xdomain_remove(port->xdomain); 625 tb_port_unconfigure_xdomain(port); 626 port->xdomain = NULL; 627 } 628 629 /* 630 * Do not send uevents until we have discovered all existing 631 * tunnels and know which switches were authorized already by 632 * the boot firmware. 633 */ 634 if (!tcm->hotplug_active) 635 dev_set_uevent_suppress(&sw->dev, true); 636 637 /* 638 * At the moment Thunderbolt 2 and beyond (devices with LC) we 639 * can support runtime PM. 640 */ 641 sw->rpm = sw->generation > 1; 642 643 if (tb_switch_add(sw)) { 644 tb_switch_put(sw); 645 return; 646 } 647 648 /* Link the switches using both links if available */ 649 upstream_port = tb_upstream_port(sw); 650 port->remote = upstream_port; 651 upstream_port->remote = port; 652 if (port->dual_link_port && upstream_port->dual_link_port) { 653 port->dual_link_port->remote = upstream_port->dual_link_port; 654 upstream_port->dual_link_port->remote = port->dual_link_port; 655 } 656 657 /* Enable lane bonding if supported */ 658 tb_switch_lane_bonding_enable(sw); 659 /* Set the link configured */ 660 tb_switch_configure_link(sw); 661 662 if (tb_enable_tmu(sw)) 663 tb_sw_warn(sw, "failed to enable TMU\n"); 664 665 /* Scan upstream retimers */ 666 tb_retimer_scan(upstream_port, true); 667 668 /* 669 * Create USB 3.x tunnels only when the switch is plugged to the 670 * domain. This is because we scan the domain also during discovery 671 * and want to discover existing USB 3.x tunnels before we create 672 * any new. 673 */ 674 if (tcm->hotplug_active && tb_tunnel_usb3(sw->tb, sw)) 675 tb_sw_warn(sw, "USB3 tunnel creation failed\n"); 676 677 tb_add_dp_resources(sw); 678 tb_scan_switch(sw); 679 } 680 681 static void tb_deactivate_and_free_tunnel(struct tb_tunnel *tunnel) 682 { 683 struct tb_port *src_port, *dst_port; 684 struct tb *tb; 685 686 if (!tunnel) 687 return; 688 689 tb_tunnel_deactivate(tunnel); 690 list_del(&tunnel->list); 691 692 tb = tunnel->tb; 693 src_port = tunnel->src_port; 694 dst_port = tunnel->dst_port; 695 696 switch (tunnel->type) { 697 case TB_TUNNEL_DP: 698 /* 699 * In case of DP tunnel make sure the DP IN resource is 700 * deallocated properly. 701 */ 702 tb_switch_dealloc_dp_resource(src_port->sw, src_port); 703 /* Now we can allow the domain to runtime suspend again */ 704 pm_runtime_mark_last_busy(&dst_port->sw->dev); 705 pm_runtime_put_autosuspend(&dst_port->sw->dev); 706 pm_runtime_mark_last_busy(&src_port->sw->dev); 707 pm_runtime_put_autosuspend(&src_port->sw->dev); 708 fallthrough; 709 710 case TB_TUNNEL_USB3: 711 tb_reclaim_usb3_bandwidth(tb, src_port, dst_port); 712 break; 713 714 default: 715 /* 716 * PCIe and DMA tunnels do not consume guaranteed 717 * bandwidth. 718 */ 719 break; 720 } 721 722 tb_tunnel_free(tunnel); 723 } 724 725 /* 726 * tb_free_invalid_tunnels() - destroy tunnels of devices that have gone away 727 */ 728 static void tb_free_invalid_tunnels(struct tb *tb) 729 { 730 struct tb_cm *tcm = tb_priv(tb); 731 struct tb_tunnel *tunnel; 732 struct tb_tunnel *n; 733 734 list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { 735 if (tb_tunnel_is_invalid(tunnel)) 736 tb_deactivate_and_free_tunnel(tunnel); 737 } 738 } 739 740 /* 741 * tb_free_unplugged_children() - traverse hierarchy and free unplugged switches 742 */ 743 static void tb_free_unplugged_children(struct tb_switch *sw) 744 { 745 struct tb_port *port; 746 747 tb_switch_for_each_port(sw, port) { 748 if (!tb_port_has_remote(port)) 749 continue; 750 751 if (port->remote->sw->is_unplugged) { 752 tb_retimer_remove_all(port); 753 tb_remove_dp_resources(port->remote->sw); 754 tb_switch_unconfigure_link(port->remote->sw); 755 tb_switch_lane_bonding_disable(port->remote->sw); 756 tb_switch_remove(port->remote->sw); 757 port->remote = NULL; 758 if (port->dual_link_port) 759 port->dual_link_port->remote = NULL; 760 } else { 761 tb_free_unplugged_children(port->remote->sw); 762 } 763 } 764 } 765 766 static struct tb_port *tb_find_pcie_down(struct tb_switch *sw, 767 const struct tb_port *port) 768 { 769 struct tb_port *down = NULL; 770 771 /* 772 * To keep plugging devices consistently in the same PCIe 773 * hierarchy, do mapping here for switch downstream PCIe ports. 774 */ 775 if (tb_switch_is_usb4(sw)) { 776 down = usb4_switch_map_pcie_down(sw, port); 777 } else if (!tb_route(sw)) { 778 int phy_port = tb_phy_port_from_link(port->port); 779 int index; 780 781 /* 782 * Hard-coded Thunderbolt port to PCIe down port mapping 783 * per controller. 784 */ 785 if (tb_switch_is_cactus_ridge(sw) || 786 tb_switch_is_alpine_ridge(sw)) 787 index = !phy_port ? 6 : 7; 788 else if (tb_switch_is_falcon_ridge(sw)) 789 index = !phy_port ? 6 : 8; 790 else if (tb_switch_is_titan_ridge(sw)) 791 index = !phy_port ? 8 : 9; 792 else 793 goto out; 794 795 /* Validate the hard-coding */ 796 if (WARN_ON(index > sw->config.max_port_number)) 797 goto out; 798 799 down = &sw->ports[index]; 800 } 801 802 if (down) { 803 if (WARN_ON(!tb_port_is_pcie_down(down))) 804 goto out; 805 if (tb_pci_port_is_enabled(down)) 806 goto out; 807 808 return down; 809 } 810 811 out: 812 return tb_find_unused_port(sw, TB_TYPE_PCIE_DOWN); 813 } 814 815 static struct tb_port *tb_find_dp_out(struct tb *tb, struct tb_port *in) 816 { 817 struct tb_port *host_port, *port; 818 struct tb_cm *tcm = tb_priv(tb); 819 820 host_port = tb_route(in->sw) ? 821 tb_port_at(tb_route(in->sw), tb->root_switch) : NULL; 822 823 list_for_each_entry(port, &tcm->dp_resources, list) { 824 if (!tb_port_is_dpout(port)) 825 continue; 826 827 if (tb_port_is_enabled(port)) { 828 tb_port_dbg(port, "in use\n"); 829 continue; 830 } 831 832 tb_port_dbg(port, "DP OUT available\n"); 833 834 /* 835 * Keep the DP tunnel under the topology starting from 836 * the same host router downstream port. 837 */ 838 if (host_port && tb_route(port->sw)) { 839 struct tb_port *p; 840 841 p = tb_port_at(tb_route(port->sw), tb->root_switch); 842 if (p != host_port) 843 continue; 844 } 845 846 return port; 847 } 848 849 return NULL; 850 } 851 852 static void tb_tunnel_dp(struct tb *tb) 853 { 854 int available_up, available_down, ret, link_nr; 855 struct tb_cm *tcm = tb_priv(tb); 856 struct tb_port *port, *in, *out; 857 struct tb_tunnel *tunnel; 858 859 if (!tb_acpi_may_tunnel_dp()) { 860 tb_dbg(tb, "DP tunneling disabled, not creating tunnel\n"); 861 return; 862 } 863 864 /* 865 * Find pair of inactive DP IN and DP OUT adapters and then 866 * establish a DP tunnel between them. 867 */ 868 tb_dbg(tb, "looking for DP IN <-> DP OUT pairs:\n"); 869 870 in = NULL; 871 out = NULL; 872 list_for_each_entry(port, &tcm->dp_resources, list) { 873 if (!tb_port_is_dpin(port)) 874 continue; 875 876 if (tb_port_is_enabled(port)) { 877 tb_port_dbg(port, "in use\n"); 878 continue; 879 } 880 881 tb_port_dbg(port, "DP IN available\n"); 882 883 out = tb_find_dp_out(tb, port); 884 if (out) { 885 in = port; 886 break; 887 } 888 } 889 890 if (!in) { 891 tb_dbg(tb, "no suitable DP IN adapter available, not tunneling\n"); 892 return; 893 } 894 if (!out) { 895 tb_dbg(tb, "no suitable DP OUT adapter available, not tunneling\n"); 896 return; 897 } 898 899 /* 900 * This is only applicable to links that are not bonded (so 901 * when Thunderbolt 1 hardware is involved somewhere in the 902 * topology). For these try to share the DP bandwidth between 903 * the two lanes. 904 */ 905 link_nr = 1; 906 list_for_each_entry(tunnel, &tcm->tunnel_list, list) { 907 if (tb_tunnel_is_dp(tunnel)) { 908 link_nr = 0; 909 break; 910 } 911 } 912 913 /* 914 * DP stream needs the domain to be active so runtime resume 915 * both ends of the tunnel. 916 * 917 * This should bring the routers in the middle active as well 918 * and keeps the domain from runtime suspending while the DP 919 * tunnel is active. 920 */ 921 pm_runtime_get_sync(&in->sw->dev); 922 pm_runtime_get_sync(&out->sw->dev); 923 924 if (tb_switch_alloc_dp_resource(in->sw, in)) { 925 tb_port_dbg(in, "no resource available for DP IN, not tunneling\n"); 926 goto err_rpm_put; 927 } 928 929 /* Make all unused USB3 bandwidth available for the new DP tunnel */ 930 ret = tb_release_unused_usb3_bandwidth(tb, in, out); 931 if (ret) { 932 tb_warn(tb, "failed to release unused bandwidth\n"); 933 goto err_dealloc_dp; 934 } 935 936 ret = tb_available_bandwidth(tb, in, out, &available_up, 937 &available_down); 938 if (ret) 939 goto err_reclaim; 940 941 tb_dbg(tb, "available bandwidth for new DP tunnel %u/%u Mb/s\n", 942 available_up, available_down); 943 944 tunnel = tb_tunnel_alloc_dp(tb, in, out, link_nr, available_up, 945 available_down); 946 if (!tunnel) { 947 tb_port_dbg(out, "could not allocate DP tunnel\n"); 948 goto err_reclaim; 949 } 950 951 if (tb_tunnel_activate(tunnel)) { 952 tb_port_info(out, "DP tunnel activation failed, aborting\n"); 953 goto err_free; 954 } 955 956 list_add_tail(&tunnel->list, &tcm->tunnel_list); 957 tb_reclaim_usb3_bandwidth(tb, in, out); 958 return; 959 960 err_free: 961 tb_tunnel_free(tunnel); 962 err_reclaim: 963 tb_reclaim_usb3_bandwidth(tb, in, out); 964 err_dealloc_dp: 965 tb_switch_dealloc_dp_resource(in->sw, in); 966 err_rpm_put: 967 pm_runtime_mark_last_busy(&out->sw->dev); 968 pm_runtime_put_autosuspend(&out->sw->dev); 969 pm_runtime_mark_last_busy(&in->sw->dev); 970 pm_runtime_put_autosuspend(&in->sw->dev); 971 } 972 973 static void tb_dp_resource_unavailable(struct tb *tb, struct tb_port *port) 974 { 975 struct tb_port *in, *out; 976 struct tb_tunnel *tunnel; 977 978 if (tb_port_is_dpin(port)) { 979 tb_port_dbg(port, "DP IN resource unavailable\n"); 980 in = port; 981 out = NULL; 982 } else { 983 tb_port_dbg(port, "DP OUT resource unavailable\n"); 984 in = NULL; 985 out = port; 986 } 987 988 tunnel = tb_find_tunnel(tb, TB_TUNNEL_DP, in, out); 989 tb_deactivate_and_free_tunnel(tunnel); 990 list_del_init(&port->list); 991 992 /* 993 * See if there is another DP OUT port that can be used for 994 * to create another tunnel. 995 */ 996 tb_tunnel_dp(tb); 997 } 998 999 static void tb_dp_resource_available(struct tb *tb, struct tb_port *port) 1000 { 1001 struct tb_cm *tcm = tb_priv(tb); 1002 struct tb_port *p; 1003 1004 if (tb_port_is_enabled(port)) 1005 return; 1006 1007 list_for_each_entry(p, &tcm->dp_resources, list) { 1008 if (p == port) 1009 return; 1010 } 1011 1012 tb_port_dbg(port, "DP %s resource available\n", 1013 tb_port_is_dpin(port) ? "IN" : "OUT"); 1014 list_add_tail(&port->list, &tcm->dp_resources); 1015 1016 /* Look for suitable DP IN <-> DP OUT pairs now */ 1017 tb_tunnel_dp(tb); 1018 } 1019 1020 static void tb_disconnect_and_release_dp(struct tb *tb) 1021 { 1022 struct tb_cm *tcm = tb_priv(tb); 1023 struct tb_tunnel *tunnel, *n; 1024 1025 /* 1026 * Tear down all DP tunnels and release their resources. They 1027 * will be re-established after resume based on plug events. 1028 */ 1029 list_for_each_entry_safe_reverse(tunnel, n, &tcm->tunnel_list, list) { 1030 if (tb_tunnel_is_dp(tunnel)) 1031 tb_deactivate_and_free_tunnel(tunnel); 1032 } 1033 1034 while (!list_empty(&tcm->dp_resources)) { 1035 struct tb_port *port; 1036 1037 port = list_first_entry(&tcm->dp_resources, 1038 struct tb_port, list); 1039 list_del_init(&port->list); 1040 } 1041 } 1042 1043 static int tb_disconnect_pci(struct tb *tb, struct tb_switch *sw) 1044 { 1045 struct tb_tunnel *tunnel; 1046 struct tb_port *up; 1047 1048 up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP); 1049 if (WARN_ON(!up)) 1050 return -ENODEV; 1051 1052 tunnel = tb_find_tunnel(tb, TB_TUNNEL_PCI, NULL, up); 1053 if (WARN_ON(!tunnel)) 1054 return -ENODEV; 1055 1056 tb_tunnel_deactivate(tunnel); 1057 list_del(&tunnel->list); 1058 tb_tunnel_free(tunnel); 1059 return 0; 1060 } 1061 1062 static int tb_tunnel_pci(struct tb *tb, struct tb_switch *sw) 1063 { 1064 struct tb_port *up, *down, *port; 1065 struct tb_cm *tcm = tb_priv(tb); 1066 struct tb_switch *parent_sw; 1067 struct tb_tunnel *tunnel; 1068 1069 up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP); 1070 if (!up) 1071 return 0; 1072 1073 /* 1074 * Look up available down port. Since we are chaining it should 1075 * be found right above this switch. 1076 */ 1077 parent_sw = tb_to_switch(sw->dev.parent); 1078 port = tb_port_at(tb_route(sw), parent_sw); 1079 down = tb_find_pcie_down(parent_sw, port); 1080 if (!down) 1081 return 0; 1082 1083 tunnel = tb_tunnel_alloc_pci(tb, up, down); 1084 if (!tunnel) 1085 return -ENOMEM; 1086 1087 if (tb_tunnel_activate(tunnel)) { 1088 tb_port_info(up, 1089 "PCIe tunnel activation failed, aborting\n"); 1090 tb_tunnel_free(tunnel); 1091 return -EIO; 1092 } 1093 1094 list_add_tail(&tunnel->list, &tcm->tunnel_list); 1095 return 0; 1096 } 1097 1098 static int tb_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, 1099 int transmit_path, int transmit_ring, 1100 int receive_path, int receive_ring) 1101 { 1102 struct tb_cm *tcm = tb_priv(tb); 1103 struct tb_port *nhi_port, *dst_port; 1104 struct tb_tunnel *tunnel; 1105 struct tb_switch *sw; 1106 1107 sw = tb_to_switch(xd->dev.parent); 1108 dst_port = tb_port_at(xd->route, sw); 1109 nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI); 1110 1111 mutex_lock(&tb->lock); 1112 tunnel = tb_tunnel_alloc_dma(tb, nhi_port, dst_port, transmit_path, 1113 transmit_ring, receive_path, receive_ring); 1114 if (!tunnel) { 1115 mutex_unlock(&tb->lock); 1116 return -ENOMEM; 1117 } 1118 1119 if (tb_tunnel_activate(tunnel)) { 1120 tb_port_info(nhi_port, 1121 "DMA tunnel activation failed, aborting\n"); 1122 tb_tunnel_free(tunnel); 1123 mutex_unlock(&tb->lock); 1124 return -EIO; 1125 } 1126 1127 list_add_tail(&tunnel->list, &tcm->tunnel_list); 1128 mutex_unlock(&tb->lock); 1129 return 0; 1130 } 1131 1132 static void __tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, 1133 int transmit_path, int transmit_ring, 1134 int receive_path, int receive_ring) 1135 { 1136 struct tb_cm *tcm = tb_priv(tb); 1137 struct tb_port *nhi_port, *dst_port; 1138 struct tb_tunnel *tunnel, *n; 1139 struct tb_switch *sw; 1140 1141 sw = tb_to_switch(xd->dev.parent); 1142 dst_port = tb_port_at(xd->route, sw); 1143 nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI); 1144 1145 list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { 1146 if (!tb_tunnel_is_dma(tunnel)) 1147 continue; 1148 if (tunnel->src_port != nhi_port || tunnel->dst_port != dst_port) 1149 continue; 1150 1151 if (tb_tunnel_match_dma(tunnel, transmit_path, transmit_ring, 1152 receive_path, receive_ring)) 1153 tb_deactivate_and_free_tunnel(tunnel); 1154 } 1155 } 1156 1157 static int tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, 1158 int transmit_path, int transmit_ring, 1159 int receive_path, int receive_ring) 1160 { 1161 if (!xd->is_unplugged) { 1162 mutex_lock(&tb->lock); 1163 __tb_disconnect_xdomain_paths(tb, xd, transmit_path, 1164 transmit_ring, receive_path, 1165 receive_ring); 1166 mutex_unlock(&tb->lock); 1167 } 1168 return 0; 1169 } 1170 1171 /* hotplug handling */ 1172 1173 /* 1174 * tb_handle_hotplug() - handle hotplug event 1175 * 1176 * Executes on tb->wq. 1177 */ 1178 static void tb_handle_hotplug(struct work_struct *work) 1179 { 1180 struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work); 1181 struct tb *tb = ev->tb; 1182 struct tb_cm *tcm = tb_priv(tb); 1183 struct tb_switch *sw; 1184 struct tb_port *port; 1185 1186 /* Bring the domain back from sleep if it was suspended */ 1187 pm_runtime_get_sync(&tb->dev); 1188 1189 mutex_lock(&tb->lock); 1190 if (!tcm->hotplug_active) 1191 goto out; /* during init, suspend or shutdown */ 1192 1193 sw = tb_switch_find_by_route(tb, ev->route); 1194 if (!sw) { 1195 tb_warn(tb, 1196 "hotplug event from non existent switch %llx:%x (unplug: %d)\n", 1197 ev->route, ev->port, ev->unplug); 1198 goto out; 1199 } 1200 if (ev->port > sw->config.max_port_number) { 1201 tb_warn(tb, 1202 "hotplug event from non existent port %llx:%x (unplug: %d)\n", 1203 ev->route, ev->port, ev->unplug); 1204 goto put_sw; 1205 } 1206 port = &sw->ports[ev->port]; 1207 if (tb_is_upstream_port(port)) { 1208 tb_dbg(tb, "hotplug event for upstream port %llx:%x (unplug: %d)\n", 1209 ev->route, ev->port, ev->unplug); 1210 goto put_sw; 1211 } 1212 1213 pm_runtime_get_sync(&sw->dev); 1214 1215 if (ev->unplug) { 1216 tb_retimer_remove_all(port); 1217 1218 if (tb_port_has_remote(port)) { 1219 tb_port_dbg(port, "switch unplugged\n"); 1220 tb_sw_set_unplugged(port->remote->sw); 1221 tb_free_invalid_tunnels(tb); 1222 tb_remove_dp_resources(port->remote->sw); 1223 tb_switch_tmu_disable(port->remote->sw); 1224 tb_switch_unconfigure_link(port->remote->sw); 1225 tb_switch_lane_bonding_disable(port->remote->sw); 1226 tb_switch_remove(port->remote->sw); 1227 port->remote = NULL; 1228 if (port->dual_link_port) 1229 port->dual_link_port->remote = NULL; 1230 /* Maybe we can create another DP tunnel */ 1231 tb_tunnel_dp(tb); 1232 } else if (port->xdomain) { 1233 struct tb_xdomain *xd = tb_xdomain_get(port->xdomain); 1234 1235 tb_port_dbg(port, "xdomain unplugged\n"); 1236 /* 1237 * Service drivers are unbound during 1238 * tb_xdomain_remove() so setting XDomain as 1239 * unplugged here prevents deadlock if they call 1240 * tb_xdomain_disable_paths(). We will tear down 1241 * all the tunnels below. 1242 */ 1243 xd->is_unplugged = true; 1244 tb_xdomain_remove(xd); 1245 port->xdomain = NULL; 1246 __tb_disconnect_xdomain_paths(tb, xd, -1, -1, -1, -1); 1247 tb_xdomain_put(xd); 1248 tb_port_unconfigure_xdomain(port); 1249 } else if (tb_port_is_dpout(port) || tb_port_is_dpin(port)) { 1250 tb_dp_resource_unavailable(tb, port); 1251 } else { 1252 tb_port_dbg(port, 1253 "got unplug event for disconnected port, ignoring\n"); 1254 } 1255 } else if (port->remote) { 1256 tb_port_dbg(port, "got plug event for connected port, ignoring\n"); 1257 } else { 1258 if (tb_port_is_null(port)) { 1259 tb_port_dbg(port, "hotplug: scanning\n"); 1260 tb_scan_port(port); 1261 if (!port->remote) 1262 tb_port_dbg(port, "hotplug: no switch found\n"); 1263 } else if (tb_port_is_dpout(port) || tb_port_is_dpin(port)) { 1264 tb_dp_resource_available(tb, port); 1265 } 1266 } 1267 1268 pm_runtime_mark_last_busy(&sw->dev); 1269 pm_runtime_put_autosuspend(&sw->dev); 1270 1271 put_sw: 1272 tb_switch_put(sw); 1273 out: 1274 mutex_unlock(&tb->lock); 1275 1276 pm_runtime_mark_last_busy(&tb->dev); 1277 pm_runtime_put_autosuspend(&tb->dev); 1278 1279 kfree(ev); 1280 } 1281 1282 /* 1283 * tb_schedule_hotplug_handler() - callback function for the control channel 1284 * 1285 * Delegates to tb_handle_hotplug. 1286 */ 1287 static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type, 1288 const void *buf, size_t size) 1289 { 1290 const struct cfg_event_pkg *pkg = buf; 1291 u64 route; 1292 1293 if (type != TB_CFG_PKG_EVENT) { 1294 tb_warn(tb, "unexpected event %#x, ignoring\n", type); 1295 return; 1296 } 1297 1298 route = tb_cfg_get_route(&pkg->header); 1299 1300 if (tb_cfg_ack_plug(tb->ctl, route, pkg->port, pkg->unplug)) { 1301 tb_warn(tb, "could not ack plug event on %llx:%x\n", route, 1302 pkg->port); 1303 } 1304 1305 tb_queue_hotplug(tb, route, pkg->port, pkg->unplug); 1306 } 1307 1308 static void tb_stop(struct tb *tb) 1309 { 1310 struct tb_cm *tcm = tb_priv(tb); 1311 struct tb_tunnel *tunnel; 1312 struct tb_tunnel *n; 1313 1314 cancel_delayed_work(&tcm->remove_work); 1315 /* tunnels are only present after everything has been initialized */ 1316 list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { 1317 /* 1318 * DMA tunnels require the driver to be functional so we 1319 * tear them down. Other protocol tunnels can be left 1320 * intact. 1321 */ 1322 if (tb_tunnel_is_dma(tunnel)) 1323 tb_tunnel_deactivate(tunnel); 1324 tb_tunnel_free(tunnel); 1325 } 1326 tb_switch_remove(tb->root_switch); 1327 tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ 1328 } 1329 1330 static int tb_scan_finalize_switch(struct device *dev, void *data) 1331 { 1332 if (tb_is_switch(dev)) { 1333 struct tb_switch *sw = tb_to_switch(dev); 1334 1335 /* 1336 * If we found that the switch was already setup by the 1337 * boot firmware, mark it as authorized now before we 1338 * send uevent to userspace. 1339 */ 1340 if (sw->boot) 1341 sw->authorized = 1; 1342 1343 dev_set_uevent_suppress(dev, false); 1344 kobject_uevent(&dev->kobj, KOBJ_ADD); 1345 device_for_each_child(dev, NULL, tb_scan_finalize_switch); 1346 } 1347 1348 return 0; 1349 } 1350 1351 static int tb_start(struct tb *tb) 1352 { 1353 struct tb_cm *tcm = tb_priv(tb); 1354 int ret; 1355 1356 tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0); 1357 if (IS_ERR(tb->root_switch)) 1358 return PTR_ERR(tb->root_switch); 1359 1360 /* 1361 * ICM firmware upgrade needs running firmware and in native 1362 * mode that is not available so disable firmware upgrade of the 1363 * root switch. 1364 */ 1365 tb->root_switch->no_nvm_upgrade = true; 1366 /* All USB4 routers support runtime PM */ 1367 tb->root_switch->rpm = tb_switch_is_usb4(tb->root_switch); 1368 1369 ret = tb_switch_configure(tb->root_switch); 1370 if (ret) { 1371 tb_switch_put(tb->root_switch); 1372 return ret; 1373 } 1374 1375 /* Announce the switch to the world */ 1376 ret = tb_switch_add(tb->root_switch); 1377 if (ret) { 1378 tb_switch_put(tb->root_switch); 1379 return ret; 1380 } 1381 1382 /* Enable TMU if it is off */ 1383 tb_switch_tmu_enable(tb->root_switch); 1384 /* Full scan to discover devices added before the driver was loaded. */ 1385 tb_scan_switch(tb->root_switch); 1386 /* Find out tunnels created by the boot firmware */ 1387 tb_discover_tunnels(tb->root_switch); 1388 /* 1389 * If the boot firmware did not create USB 3.x tunnels create them 1390 * now for the whole topology. 1391 */ 1392 tb_create_usb3_tunnels(tb->root_switch); 1393 /* Add DP IN resources for the root switch */ 1394 tb_add_dp_resources(tb->root_switch); 1395 /* Make the discovered switches available to the userspace */ 1396 device_for_each_child(&tb->root_switch->dev, NULL, 1397 tb_scan_finalize_switch); 1398 1399 /* Allow tb_handle_hotplug to progress events */ 1400 tcm->hotplug_active = true; 1401 return 0; 1402 } 1403 1404 static int tb_suspend_noirq(struct tb *tb) 1405 { 1406 struct tb_cm *tcm = tb_priv(tb); 1407 1408 tb_dbg(tb, "suspending...\n"); 1409 tb_disconnect_and_release_dp(tb); 1410 tb_switch_suspend(tb->root_switch, false); 1411 tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ 1412 tb_dbg(tb, "suspend finished\n"); 1413 1414 return 0; 1415 } 1416 1417 static void tb_restore_children(struct tb_switch *sw) 1418 { 1419 struct tb_port *port; 1420 1421 /* No need to restore if the router is already unplugged */ 1422 if (sw->is_unplugged) 1423 return; 1424 1425 if (tb_enable_tmu(sw)) 1426 tb_sw_warn(sw, "failed to restore TMU configuration\n"); 1427 1428 tb_switch_for_each_port(sw, port) { 1429 if (!tb_port_has_remote(port) && !port->xdomain) 1430 continue; 1431 1432 if (port->remote) { 1433 tb_switch_lane_bonding_enable(port->remote->sw); 1434 tb_switch_configure_link(port->remote->sw); 1435 1436 tb_restore_children(port->remote->sw); 1437 } else if (port->xdomain) { 1438 tb_port_configure_xdomain(port); 1439 } 1440 } 1441 } 1442 1443 static int tb_resume_noirq(struct tb *tb) 1444 { 1445 struct tb_cm *tcm = tb_priv(tb); 1446 struct tb_tunnel *tunnel, *n; 1447 1448 tb_dbg(tb, "resuming...\n"); 1449 1450 /* remove any pci devices the firmware might have setup */ 1451 tb_switch_reset(tb->root_switch); 1452 1453 tb_switch_resume(tb->root_switch); 1454 tb_free_invalid_tunnels(tb); 1455 tb_free_unplugged_children(tb->root_switch); 1456 tb_restore_children(tb->root_switch); 1457 list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) 1458 tb_tunnel_restart(tunnel); 1459 if (!list_empty(&tcm->tunnel_list)) { 1460 /* 1461 * the pcie links need some time to get going. 1462 * 100ms works for me... 1463 */ 1464 tb_dbg(tb, "tunnels restarted, sleeping for 100ms\n"); 1465 msleep(100); 1466 } 1467 /* Allow tb_handle_hotplug to progress events */ 1468 tcm->hotplug_active = true; 1469 tb_dbg(tb, "resume finished\n"); 1470 1471 return 0; 1472 } 1473 1474 static int tb_free_unplugged_xdomains(struct tb_switch *sw) 1475 { 1476 struct tb_port *port; 1477 int ret = 0; 1478 1479 tb_switch_for_each_port(sw, port) { 1480 if (tb_is_upstream_port(port)) 1481 continue; 1482 if (port->xdomain && port->xdomain->is_unplugged) { 1483 tb_retimer_remove_all(port); 1484 tb_xdomain_remove(port->xdomain); 1485 tb_port_unconfigure_xdomain(port); 1486 port->xdomain = NULL; 1487 ret++; 1488 } else if (port->remote) { 1489 ret += tb_free_unplugged_xdomains(port->remote->sw); 1490 } 1491 } 1492 1493 return ret; 1494 } 1495 1496 static int tb_freeze_noirq(struct tb *tb) 1497 { 1498 struct tb_cm *tcm = tb_priv(tb); 1499 1500 tcm->hotplug_active = false; 1501 return 0; 1502 } 1503 1504 static int tb_thaw_noirq(struct tb *tb) 1505 { 1506 struct tb_cm *tcm = tb_priv(tb); 1507 1508 tcm->hotplug_active = true; 1509 return 0; 1510 } 1511 1512 static void tb_complete(struct tb *tb) 1513 { 1514 /* 1515 * Release any unplugged XDomains and if there is a case where 1516 * another domain is swapped in place of unplugged XDomain we 1517 * need to run another rescan. 1518 */ 1519 mutex_lock(&tb->lock); 1520 if (tb_free_unplugged_xdomains(tb->root_switch)) 1521 tb_scan_switch(tb->root_switch); 1522 mutex_unlock(&tb->lock); 1523 } 1524 1525 static int tb_runtime_suspend(struct tb *tb) 1526 { 1527 struct tb_cm *tcm = tb_priv(tb); 1528 1529 mutex_lock(&tb->lock); 1530 tb_switch_suspend(tb->root_switch, true); 1531 tcm->hotplug_active = false; 1532 mutex_unlock(&tb->lock); 1533 1534 return 0; 1535 } 1536 1537 static void tb_remove_work(struct work_struct *work) 1538 { 1539 struct tb_cm *tcm = container_of(work, struct tb_cm, remove_work.work); 1540 struct tb *tb = tcm_to_tb(tcm); 1541 1542 mutex_lock(&tb->lock); 1543 if (tb->root_switch) { 1544 tb_free_unplugged_children(tb->root_switch); 1545 tb_free_unplugged_xdomains(tb->root_switch); 1546 } 1547 mutex_unlock(&tb->lock); 1548 } 1549 1550 static int tb_runtime_resume(struct tb *tb) 1551 { 1552 struct tb_cm *tcm = tb_priv(tb); 1553 struct tb_tunnel *tunnel, *n; 1554 1555 mutex_lock(&tb->lock); 1556 tb_switch_resume(tb->root_switch); 1557 tb_free_invalid_tunnels(tb); 1558 tb_restore_children(tb->root_switch); 1559 list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) 1560 tb_tunnel_restart(tunnel); 1561 tcm->hotplug_active = true; 1562 mutex_unlock(&tb->lock); 1563 1564 /* 1565 * Schedule cleanup of any unplugged devices. Run this in a 1566 * separate thread to avoid possible deadlock if the device 1567 * removal runtime resumes the unplugged device. 1568 */ 1569 queue_delayed_work(tb->wq, &tcm->remove_work, msecs_to_jiffies(50)); 1570 return 0; 1571 } 1572 1573 static const struct tb_cm_ops tb_cm_ops = { 1574 .start = tb_start, 1575 .stop = tb_stop, 1576 .suspend_noirq = tb_suspend_noirq, 1577 .resume_noirq = tb_resume_noirq, 1578 .freeze_noirq = tb_freeze_noirq, 1579 .thaw_noirq = tb_thaw_noirq, 1580 .complete = tb_complete, 1581 .runtime_suspend = tb_runtime_suspend, 1582 .runtime_resume = tb_runtime_resume, 1583 .handle_event = tb_handle_event, 1584 .disapprove_switch = tb_disconnect_pci, 1585 .approve_switch = tb_tunnel_pci, 1586 .approve_xdomain_paths = tb_approve_xdomain_paths, 1587 .disconnect_xdomain_paths = tb_disconnect_xdomain_paths, 1588 }; 1589 1590 /* 1591 * During suspend the Thunderbolt controller is reset and all PCIe 1592 * tunnels are lost. The NHI driver will try to reestablish all tunnels 1593 * during resume. This adds device links between the tunneled PCIe 1594 * downstream ports and the NHI so that the device core will make sure 1595 * NHI is resumed first before the rest. 1596 */ 1597 static void tb_apple_add_links(struct tb_nhi *nhi) 1598 { 1599 struct pci_dev *upstream, *pdev; 1600 1601 if (!x86_apple_machine) 1602 return; 1603 1604 switch (nhi->pdev->device) { 1605 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE: 1606 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C: 1607 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI: 1608 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI: 1609 break; 1610 default: 1611 return; 1612 } 1613 1614 upstream = pci_upstream_bridge(nhi->pdev); 1615 while (upstream) { 1616 if (!pci_is_pcie(upstream)) 1617 return; 1618 if (pci_pcie_type(upstream) == PCI_EXP_TYPE_UPSTREAM) 1619 break; 1620 upstream = pci_upstream_bridge(upstream); 1621 } 1622 1623 if (!upstream) 1624 return; 1625 1626 /* 1627 * For each hotplug downstream port, create add device link 1628 * back to NHI so that PCIe tunnels can be re-established after 1629 * sleep. 1630 */ 1631 for_each_pci_bridge(pdev, upstream->subordinate) { 1632 const struct device_link *link; 1633 1634 if (!pci_is_pcie(pdev)) 1635 continue; 1636 if (pci_pcie_type(pdev) != PCI_EXP_TYPE_DOWNSTREAM || 1637 !pdev->is_hotplug_bridge) 1638 continue; 1639 1640 link = device_link_add(&pdev->dev, &nhi->pdev->dev, 1641 DL_FLAG_AUTOREMOVE_SUPPLIER | 1642 DL_FLAG_PM_RUNTIME); 1643 if (link) { 1644 dev_dbg(&nhi->pdev->dev, "created link from %s\n", 1645 dev_name(&pdev->dev)); 1646 } else { 1647 dev_warn(&nhi->pdev->dev, "device link creation from %s failed\n", 1648 dev_name(&pdev->dev)); 1649 } 1650 } 1651 } 1652 1653 struct tb *tb_probe(struct tb_nhi *nhi) 1654 { 1655 struct tb_cm *tcm; 1656 struct tb *tb; 1657 1658 tb = tb_domain_alloc(nhi, TB_TIMEOUT, sizeof(*tcm)); 1659 if (!tb) 1660 return NULL; 1661 1662 if (tb_acpi_may_tunnel_pcie()) 1663 tb->security_level = TB_SECURITY_USER; 1664 else 1665 tb->security_level = TB_SECURITY_NOPCIE; 1666 1667 tb->cm_ops = &tb_cm_ops; 1668 1669 tcm = tb_priv(tb); 1670 INIT_LIST_HEAD(&tcm->tunnel_list); 1671 INIT_LIST_HEAD(&tcm->dp_resources); 1672 INIT_DELAYED_WORK(&tcm->remove_work, tb_remove_work); 1673 1674 tb_dbg(tb, "using software connection manager\n"); 1675 1676 tb_apple_add_links(nhi); 1677 tb_acpi_add_links(nhi); 1678 1679 return tb; 1680 } 1681