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