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) { 215 if (WARN_ON(!tb_port_is_usb3_down(down))) 216 goto out; 217 if (WARN_ON(tb_usb3_port_is_enabled(down))) 218 goto out; 219 220 return down; 221 } 222 223 out: 224 return tb_find_unused_port(sw, TB_TYPE_USB3_DOWN); 225 } 226 227 static int tb_tunnel_usb3(struct tb *tb, struct tb_switch *sw) 228 { 229 struct tb_switch *parent = tb_switch_parent(sw); 230 struct tb_port *up, *down, *port; 231 struct tb_cm *tcm = tb_priv(tb); 232 struct tb_tunnel *tunnel; 233 234 up = tb_switch_find_port(sw, TB_TYPE_USB3_UP); 235 if (!up) 236 return 0; 237 238 /* 239 * Look up available down port. Since we are chaining it should 240 * be found right above this switch. 241 */ 242 port = tb_port_at(tb_route(sw), parent); 243 down = tb_find_usb3_down(parent, port); 244 if (!down) 245 return 0; 246 247 if (tb_route(parent)) { 248 struct tb_port *parent_up; 249 /* 250 * Check first that the parent switch has its upstream USB3 251 * port enabled. Otherwise the chain is not complete and 252 * there is no point setting up a new tunnel. 253 */ 254 parent_up = tb_switch_find_port(parent, TB_TYPE_USB3_UP); 255 if (!parent_up || !tb_port_is_enabled(parent_up)) 256 return 0; 257 } 258 259 tunnel = tb_tunnel_alloc_usb3(tb, up, down); 260 if (!tunnel) 261 return -ENOMEM; 262 263 if (tb_tunnel_activate(tunnel)) { 264 tb_port_info(up, 265 "USB3 tunnel activation failed, aborting\n"); 266 tb_tunnel_free(tunnel); 267 return -EIO; 268 } 269 270 list_add_tail(&tunnel->list, &tcm->tunnel_list); 271 return 0; 272 } 273 274 static int tb_create_usb3_tunnels(struct tb_switch *sw) 275 { 276 struct tb_port *port; 277 int ret; 278 279 if (tb_route(sw)) { 280 ret = tb_tunnel_usb3(sw->tb, sw); 281 if (ret) 282 return ret; 283 } 284 285 tb_switch_for_each_port(sw, port) { 286 if (!tb_port_has_remote(port)) 287 continue; 288 ret = tb_create_usb3_tunnels(port->remote->sw); 289 if (ret) 290 return ret; 291 } 292 293 return 0; 294 } 295 296 static void tb_scan_port(struct tb_port *port); 297 298 /** 299 * tb_scan_switch() - scan for and initialize downstream switches 300 */ 301 static void tb_scan_switch(struct tb_switch *sw) 302 { 303 struct tb_port *port; 304 305 tb_switch_for_each_port(sw, port) 306 tb_scan_port(port); 307 } 308 309 /** 310 * tb_scan_port() - check for and initialize switches below port 311 */ 312 static void tb_scan_port(struct tb_port *port) 313 { 314 struct tb_cm *tcm = tb_priv(port->sw->tb); 315 struct tb_port *upstream_port; 316 struct tb_switch *sw; 317 318 if (tb_is_upstream_port(port)) 319 return; 320 321 if (tb_port_is_dpout(port) && tb_dp_port_hpd_is_active(port) == 1 && 322 !tb_dp_port_is_enabled(port)) { 323 tb_port_dbg(port, "DP adapter HPD set, queuing hotplug\n"); 324 tb_queue_hotplug(port->sw->tb, tb_route(port->sw), port->port, 325 false); 326 return; 327 } 328 329 if (port->config.type != TB_TYPE_PORT) 330 return; 331 if (port->dual_link_port && port->link_nr) 332 return; /* 333 * Downstream switch is reachable through two ports. 334 * Only scan on the primary port (link_nr == 0). 335 */ 336 if (tb_wait_for_port(port, false) <= 0) 337 return; 338 if (port->remote) { 339 tb_port_dbg(port, "port already has a remote\n"); 340 return; 341 } 342 sw = tb_switch_alloc(port->sw->tb, &port->sw->dev, 343 tb_downstream_route(port)); 344 if (IS_ERR(sw)) { 345 /* 346 * If there is an error accessing the connected switch 347 * it may be connected to another domain. Also we allow 348 * the other domain to be connected to a max depth switch. 349 */ 350 if (PTR_ERR(sw) == -EIO || PTR_ERR(sw) == -EADDRNOTAVAIL) 351 tb_scan_xdomain(port); 352 return; 353 } 354 355 if (tb_switch_configure(sw)) { 356 tb_switch_put(sw); 357 return; 358 } 359 360 /* 361 * If there was previously another domain connected remove it 362 * first. 363 */ 364 if (port->xdomain) { 365 tb_xdomain_remove(port->xdomain); 366 port->xdomain = NULL; 367 } 368 369 /* 370 * Do not send uevents until we have discovered all existing 371 * tunnels and know which switches were authorized already by 372 * the boot firmware. 373 */ 374 if (!tcm->hotplug_active) 375 dev_set_uevent_suppress(&sw->dev, true); 376 377 if (tb_switch_add(sw)) { 378 tb_switch_put(sw); 379 return; 380 } 381 382 /* Link the switches using both links if available */ 383 upstream_port = tb_upstream_port(sw); 384 port->remote = upstream_port; 385 upstream_port->remote = port; 386 if (port->dual_link_port && upstream_port->dual_link_port) { 387 port->dual_link_port->remote = upstream_port->dual_link_port; 388 upstream_port->dual_link_port->remote = port->dual_link_port; 389 } 390 391 /* Enable lane bonding if supported */ 392 if (tb_switch_lane_bonding_enable(sw)) 393 tb_sw_warn(sw, "failed to enable lane bonding\n"); 394 395 if (tb_enable_tmu(sw)) 396 tb_sw_warn(sw, "failed to enable TMU\n"); 397 398 /* 399 * Create USB 3.x tunnels only when the switch is plugged to the 400 * domain. This is because we scan the domain also during discovery 401 * and want to discover existing USB 3.x tunnels before we create 402 * any new. 403 */ 404 if (tcm->hotplug_active && tb_tunnel_usb3(sw->tb, sw)) 405 tb_sw_warn(sw, "USB3 tunnel creation failed\n"); 406 407 tb_scan_switch(sw); 408 } 409 410 static struct tb_tunnel *tb_find_tunnel(struct tb *tb, enum tb_tunnel_type type, 411 struct tb_port *src_port, 412 struct tb_port *dst_port) 413 { 414 struct tb_cm *tcm = tb_priv(tb); 415 struct tb_tunnel *tunnel; 416 417 list_for_each_entry(tunnel, &tcm->tunnel_list, list) { 418 if (tunnel->type == type && 419 ((src_port && src_port == tunnel->src_port) || 420 (dst_port && dst_port == tunnel->dst_port))) { 421 return tunnel; 422 } 423 } 424 425 return NULL; 426 } 427 428 static void tb_deactivate_and_free_tunnel(struct tb_tunnel *tunnel) 429 { 430 if (!tunnel) 431 return; 432 433 tb_tunnel_deactivate(tunnel); 434 list_del(&tunnel->list); 435 436 /* 437 * In case of DP tunnel make sure the DP IN resource is deallocated 438 * properly. 439 */ 440 if (tb_tunnel_is_dp(tunnel)) { 441 struct tb_port *in = tunnel->src_port; 442 443 tb_switch_dealloc_dp_resource(in->sw, in); 444 } 445 446 tb_tunnel_free(tunnel); 447 } 448 449 /** 450 * tb_free_invalid_tunnels() - destroy tunnels of devices that have gone away 451 */ 452 static void tb_free_invalid_tunnels(struct tb *tb) 453 { 454 struct tb_cm *tcm = tb_priv(tb); 455 struct tb_tunnel *tunnel; 456 struct tb_tunnel *n; 457 458 list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { 459 if (tb_tunnel_is_invalid(tunnel)) 460 tb_deactivate_and_free_tunnel(tunnel); 461 } 462 } 463 464 /** 465 * tb_free_unplugged_children() - traverse hierarchy and free unplugged switches 466 */ 467 static void tb_free_unplugged_children(struct tb_switch *sw) 468 { 469 struct tb_port *port; 470 471 tb_switch_for_each_port(sw, port) { 472 if (!tb_port_has_remote(port)) 473 continue; 474 475 if (port->remote->sw->is_unplugged) { 476 tb_remove_dp_resources(port->remote->sw); 477 tb_switch_lane_bonding_disable(port->remote->sw); 478 tb_switch_remove(port->remote->sw); 479 port->remote = NULL; 480 if (port->dual_link_port) 481 port->dual_link_port->remote = NULL; 482 } else { 483 tb_free_unplugged_children(port->remote->sw); 484 } 485 } 486 } 487 488 static struct tb_port *tb_find_pcie_down(struct tb_switch *sw, 489 const struct tb_port *port) 490 { 491 struct tb_port *down = NULL; 492 493 /* 494 * To keep plugging devices consistently in the same PCIe 495 * hierarchy, do mapping here for switch downstream PCIe ports. 496 */ 497 if (tb_switch_is_usb4(sw)) { 498 down = usb4_switch_map_pcie_down(sw, port); 499 } else if (!tb_route(sw)) { 500 int phy_port = tb_phy_port_from_link(port->port); 501 int index; 502 503 /* 504 * Hard-coded Thunderbolt port to PCIe down port mapping 505 * per controller. 506 */ 507 if (tb_switch_is_cactus_ridge(sw) || 508 tb_switch_is_alpine_ridge(sw)) 509 index = !phy_port ? 6 : 7; 510 else if (tb_switch_is_falcon_ridge(sw)) 511 index = !phy_port ? 6 : 8; 512 else if (tb_switch_is_titan_ridge(sw)) 513 index = !phy_port ? 8 : 9; 514 else 515 goto out; 516 517 /* Validate the hard-coding */ 518 if (WARN_ON(index > sw->config.max_port_number)) 519 goto out; 520 521 down = &sw->ports[index]; 522 } 523 524 if (down) { 525 if (WARN_ON(!tb_port_is_pcie_down(down))) 526 goto out; 527 if (WARN_ON(tb_pci_port_is_enabled(down))) 528 goto out; 529 530 return down; 531 } 532 533 out: 534 return tb_find_unused_port(sw, TB_TYPE_PCIE_DOWN); 535 } 536 537 static int tb_available_bw(struct tb_cm *tcm, struct tb_port *in, 538 struct tb_port *out) 539 { 540 struct tb_switch *sw = out->sw; 541 struct tb_tunnel *tunnel; 542 int bw, available_bw = 40000; 543 544 while (sw && sw != in->sw) { 545 bw = sw->link_speed * sw->link_width * 1000; /* Mb/s */ 546 /* Leave 10% guard band */ 547 bw -= bw / 10; 548 549 /* 550 * Check for any active DP tunnels that go through this 551 * switch and reduce their consumed bandwidth from 552 * available. 553 */ 554 list_for_each_entry(tunnel, &tcm->tunnel_list, list) { 555 int consumed_bw; 556 557 if (!tb_tunnel_switch_on_path(tunnel, sw)) 558 continue; 559 560 consumed_bw = tb_tunnel_consumed_bandwidth(tunnel); 561 if (consumed_bw < 0) 562 return consumed_bw; 563 564 bw -= consumed_bw; 565 } 566 567 if (bw < available_bw) 568 available_bw = bw; 569 570 sw = tb_switch_parent(sw); 571 } 572 573 return available_bw; 574 } 575 576 static void tb_tunnel_dp(struct tb *tb) 577 { 578 struct tb_cm *tcm = tb_priv(tb); 579 struct tb_port *port, *in, *out; 580 struct tb_tunnel *tunnel; 581 int available_bw; 582 583 /* 584 * Find pair of inactive DP IN and DP OUT adapters and then 585 * establish a DP tunnel between them. 586 */ 587 tb_dbg(tb, "looking for DP IN <-> DP OUT pairs:\n"); 588 589 in = NULL; 590 out = NULL; 591 list_for_each_entry(port, &tcm->dp_resources, list) { 592 if (tb_port_is_enabled(port)) { 593 tb_port_dbg(port, "in use\n"); 594 continue; 595 } 596 597 tb_port_dbg(port, "available\n"); 598 599 if (!in && tb_port_is_dpin(port)) 600 in = port; 601 else if (!out && tb_port_is_dpout(port)) 602 out = port; 603 } 604 605 if (!in) { 606 tb_dbg(tb, "no suitable DP IN adapter available, not tunneling\n"); 607 return; 608 } 609 if (!out) { 610 tb_dbg(tb, "no suitable DP OUT adapter available, not tunneling\n"); 611 return; 612 } 613 614 if (tb_switch_alloc_dp_resource(in->sw, in)) { 615 tb_port_dbg(in, "no resource available for DP IN, not tunneling\n"); 616 return; 617 } 618 619 /* Calculate available bandwidth between in and out */ 620 available_bw = tb_available_bw(tcm, in, out); 621 if (available_bw < 0) { 622 tb_warn(tb, "failed to determine available bandwidth\n"); 623 return; 624 } 625 626 tb_dbg(tb, "available bandwidth for new DP tunnel %u Mb/s\n", 627 available_bw); 628 629 tunnel = tb_tunnel_alloc_dp(tb, in, out, available_bw); 630 if (!tunnel) { 631 tb_port_dbg(out, "could not allocate DP tunnel\n"); 632 goto dealloc_dp; 633 } 634 635 if (tb_tunnel_activate(tunnel)) { 636 tb_port_info(out, "DP tunnel activation failed, aborting\n"); 637 tb_tunnel_free(tunnel); 638 goto dealloc_dp; 639 } 640 641 list_add_tail(&tunnel->list, &tcm->tunnel_list); 642 return; 643 644 dealloc_dp: 645 tb_switch_dealloc_dp_resource(in->sw, in); 646 } 647 648 static void tb_dp_resource_unavailable(struct tb *tb, struct tb_port *port) 649 { 650 struct tb_port *in, *out; 651 struct tb_tunnel *tunnel; 652 653 if (tb_port_is_dpin(port)) { 654 tb_port_dbg(port, "DP IN resource unavailable\n"); 655 in = port; 656 out = NULL; 657 } else { 658 tb_port_dbg(port, "DP OUT resource unavailable\n"); 659 in = NULL; 660 out = port; 661 } 662 663 tunnel = tb_find_tunnel(tb, TB_TUNNEL_DP, in, out); 664 tb_deactivate_and_free_tunnel(tunnel); 665 list_del_init(&port->list); 666 667 /* 668 * See if there is another DP OUT port that can be used for 669 * to create another tunnel. 670 */ 671 tb_tunnel_dp(tb); 672 } 673 674 static void tb_dp_resource_available(struct tb *tb, struct tb_port *port) 675 { 676 struct tb_cm *tcm = tb_priv(tb); 677 struct tb_port *p; 678 679 if (tb_port_is_enabled(port)) 680 return; 681 682 list_for_each_entry(p, &tcm->dp_resources, list) { 683 if (p == port) 684 return; 685 } 686 687 tb_port_dbg(port, "DP %s resource available\n", 688 tb_port_is_dpin(port) ? "IN" : "OUT"); 689 list_add_tail(&port->list, &tcm->dp_resources); 690 691 /* Look for suitable DP IN <-> DP OUT pairs now */ 692 tb_tunnel_dp(tb); 693 } 694 695 static int tb_tunnel_pci(struct tb *tb, struct tb_switch *sw) 696 { 697 struct tb_port *up, *down, *port; 698 struct tb_cm *tcm = tb_priv(tb); 699 struct tb_switch *parent_sw; 700 struct tb_tunnel *tunnel; 701 702 up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP); 703 if (!up) 704 return 0; 705 706 /* 707 * Look up available down port. Since we are chaining it should 708 * be found right above this switch. 709 */ 710 parent_sw = tb_to_switch(sw->dev.parent); 711 port = tb_port_at(tb_route(sw), parent_sw); 712 down = tb_find_pcie_down(parent_sw, port); 713 if (!down) 714 return 0; 715 716 tunnel = tb_tunnel_alloc_pci(tb, up, down); 717 if (!tunnel) 718 return -ENOMEM; 719 720 if (tb_tunnel_activate(tunnel)) { 721 tb_port_info(up, 722 "PCIe tunnel activation failed, aborting\n"); 723 tb_tunnel_free(tunnel); 724 return -EIO; 725 } 726 727 list_add_tail(&tunnel->list, &tcm->tunnel_list); 728 return 0; 729 } 730 731 static int tb_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd) 732 { 733 struct tb_cm *tcm = tb_priv(tb); 734 struct tb_port *nhi_port, *dst_port; 735 struct tb_tunnel *tunnel; 736 struct tb_switch *sw; 737 738 sw = tb_to_switch(xd->dev.parent); 739 dst_port = tb_port_at(xd->route, sw); 740 nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI); 741 742 mutex_lock(&tb->lock); 743 tunnel = tb_tunnel_alloc_dma(tb, nhi_port, dst_port, xd->transmit_ring, 744 xd->transmit_path, xd->receive_ring, 745 xd->receive_path); 746 if (!tunnel) { 747 mutex_unlock(&tb->lock); 748 return -ENOMEM; 749 } 750 751 if (tb_tunnel_activate(tunnel)) { 752 tb_port_info(nhi_port, 753 "DMA tunnel activation failed, aborting\n"); 754 tb_tunnel_free(tunnel); 755 mutex_unlock(&tb->lock); 756 return -EIO; 757 } 758 759 list_add_tail(&tunnel->list, &tcm->tunnel_list); 760 mutex_unlock(&tb->lock); 761 return 0; 762 } 763 764 static void __tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd) 765 { 766 struct tb_port *dst_port; 767 struct tb_tunnel *tunnel; 768 struct tb_switch *sw; 769 770 sw = tb_to_switch(xd->dev.parent); 771 dst_port = tb_port_at(xd->route, sw); 772 773 /* 774 * It is possible that the tunnel was already teared down (in 775 * case of cable disconnect) so it is fine if we cannot find it 776 * here anymore. 777 */ 778 tunnel = tb_find_tunnel(tb, TB_TUNNEL_DMA, NULL, dst_port); 779 tb_deactivate_and_free_tunnel(tunnel); 780 } 781 782 static int tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd) 783 { 784 if (!xd->is_unplugged) { 785 mutex_lock(&tb->lock); 786 __tb_disconnect_xdomain_paths(tb, xd); 787 mutex_unlock(&tb->lock); 788 } 789 return 0; 790 } 791 792 /* hotplug handling */ 793 794 /** 795 * tb_handle_hotplug() - handle hotplug event 796 * 797 * Executes on tb->wq. 798 */ 799 static void tb_handle_hotplug(struct work_struct *work) 800 { 801 struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work); 802 struct tb *tb = ev->tb; 803 struct tb_cm *tcm = tb_priv(tb); 804 struct tb_switch *sw; 805 struct tb_port *port; 806 mutex_lock(&tb->lock); 807 if (!tcm->hotplug_active) 808 goto out; /* during init, suspend or shutdown */ 809 810 sw = tb_switch_find_by_route(tb, ev->route); 811 if (!sw) { 812 tb_warn(tb, 813 "hotplug event from non existent switch %llx:%x (unplug: %d)\n", 814 ev->route, ev->port, ev->unplug); 815 goto out; 816 } 817 if (ev->port > sw->config.max_port_number) { 818 tb_warn(tb, 819 "hotplug event from non existent port %llx:%x (unplug: %d)\n", 820 ev->route, ev->port, ev->unplug); 821 goto put_sw; 822 } 823 port = &sw->ports[ev->port]; 824 if (tb_is_upstream_port(port)) { 825 tb_dbg(tb, "hotplug event for upstream port %llx:%x (unplug: %d)\n", 826 ev->route, ev->port, ev->unplug); 827 goto put_sw; 828 } 829 if (ev->unplug) { 830 if (tb_port_has_remote(port)) { 831 tb_port_dbg(port, "switch unplugged\n"); 832 tb_sw_set_unplugged(port->remote->sw); 833 tb_free_invalid_tunnels(tb); 834 tb_remove_dp_resources(port->remote->sw); 835 tb_switch_tmu_disable(port->remote->sw); 836 tb_switch_lane_bonding_disable(port->remote->sw); 837 tb_switch_remove(port->remote->sw); 838 port->remote = NULL; 839 if (port->dual_link_port) 840 port->dual_link_port->remote = NULL; 841 /* Maybe we can create another DP tunnel */ 842 tb_tunnel_dp(tb); 843 } else if (port->xdomain) { 844 struct tb_xdomain *xd = tb_xdomain_get(port->xdomain); 845 846 tb_port_dbg(port, "xdomain unplugged\n"); 847 /* 848 * Service drivers are unbound during 849 * tb_xdomain_remove() so setting XDomain as 850 * unplugged here prevents deadlock if they call 851 * tb_xdomain_disable_paths(). We will tear down 852 * the path below. 853 */ 854 xd->is_unplugged = true; 855 tb_xdomain_remove(xd); 856 port->xdomain = NULL; 857 __tb_disconnect_xdomain_paths(tb, xd); 858 tb_xdomain_put(xd); 859 } else if (tb_port_is_dpout(port) || tb_port_is_dpin(port)) { 860 tb_dp_resource_unavailable(tb, port); 861 } else { 862 tb_port_dbg(port, 863 "got unplug event for disconnected port, ignoring\n"); 864 } 865 } else if (port->remote) { 866 tb_port_dbg(port, "got plug event for connected port, ignoring\n"); 867 } else { 868 if (tb_port_is_null(port)) { 869 tb_port_dbg(port, "hotplug: scanning\n"); 870 tb_scan_port(port); 871 if (!port->remote) 872 tb_port_dbg(port, "hotplug: no switch found\n"); 873 } else if (tb_port_is_dpout(port) || tb_port_is_dpin(port)) { 874 tb_dp_resource_available(tb, port); 875 } 876 } 877 878 put_sw: 879 tb_switch_put(sw); 880 out: 881 mutex_unlock(&tb->lock); 882 kfree(ev); 883 } 884 885 /** 886 * tb_schedule_hotplug_handler() - callback function for the control channel 887 * 888 * Delegates to tb_handle_hotplug. 889 */ 890 static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type, 891 const void *buf, size_t size) 892 { 893 const struct cfg_event_pkg *pkg = buf; 894 u64 route; 895 896 if (type != TB_CFG_PKG_EVENT) { 897 tb_warn(tb, "unexpected event %#x, ignoring\n", type); 898 return; 899 } 900 901 route = tb_cfg_get_route(&pkg->header); 902 903 if (tb_cfg_ack_plug(tb->ctl, route, pkg->port, pkg->unplug)) { 904 tb_warn(tb, "could not ack plug event on %llx:%x\n", route, 905 pkg->port); 906 } 907 908 tb_queue_hotplug(tb, route, pkg->port, pkg->unplug); 909 } 910 911 static void tb_stop(struct tb *tb) 912 { 913 struct tb_cm *tcm = tb_priv(tb); 914 struct tb_tunnel *tunnel; 915 struct tb_tunnel *n; 916 917 /* tunnels are only present after everything has been initialized */ 918 list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { 919 /* 920 * DMA tunnels require the driver to be functional so we 921 * tear them down. Other protocol tunnels can be left 922 * intact. 923 */ 924 if (tb_tunnel_is_dma(tunnel)) 925 tb_tunnel_deactivate(tunnel); 926 tb_tunnel_free(tunnel); 927 } 928 tb_switch_remove(tb->root_switch); 929 tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ 930 } 931 932 static int tb_scan_finalize_switch(struct device *dev, void *data) 933 { 934 if (tb_is_switch(dev)) { 935 struct tb_switch *sw = tb_to_switch(dev); 936 937 /* 938 * If we found that the switch was already setup by the 939 * boot firmware, mark it as authorized now before we 940 * send uevent to userspace. 941 */ 942 if (sw->boot) 943 sw->authorized = 1; 944 945 dev_set_uevent_suppress(dev, false); 946 kobject_uevent(&dev->kobj, KOBJ_ADD); 947 device_for_each_child(dev, NULL, tb_scan_finalize_switch); 948 } 949 950 return 0; 951 } 952 953 static int tb_start(struct tb *tb) 954 { 955 struct tb_cm *tcm = tb_priv(tb); 956 int ret; 957 958 tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0); 959 if (IS_ERR(tb->root_switch)) 960 return PTR_ERR(tb->root_switch); 961 962 /* 963 * ICM firmware upgrade needs running firmware and in native 964 * mode that is not available so disable firmware upgrade of the 965 * root switch. 966 */ 967 tb->root_switch->no_nvm_upgrade = true; 968 969 ret = tb_switch_configure(tb->root_switch); 970 if (ret) { 971 tb_switch_put(tb->root_switch); 972 return ret; 973 } 974 975 /* Announce the switch to the world */ 976 ret = tb_switch_add(tb->root_switch); 977 if (ret) { 978 tb_switch_put(tb->root_switch); 979 return ret; 980 } 981 982 /* Enable TMU if it is off */ 983 tb_switch_tmu_enable(tb->root_switch); 984 /* Full scan to discover devices added before the driver was loaded. */ 985 tb_scan_switch(tb->root_switch); 986 /* Find out tunnels created by the boot firmware */ 987 tb_discover_tunnels(tb->root_switch); 988 /* 989 * If the boot firmware did not create USB 3.x tunnels create them 990 * now for the whole topology. 991 */ 992 tb_create_usb3_tunnels(tb->root_switch); 993 /* Add DP IN resources for the root switch */ 994 tb_add_dp_resources(tb->root_switch); 995 /* Make the discovered switches available to the userspace */ 996 device_for_each_child(&tb->root_switch->dev, NULL, 997 tb_scan_finalize_switch); 998 999 /* Allow tb_handle_hotplug to progress events */ 1000 tcm->hotplug_active = true; 1001 return 0; 1002 } 1003 1004 static int tb_suspend_noirq(struct tb *tb) 1005 { 1006 struct tb_cm *tcm = tb_priv(tb); 1007 1008 tb_dbg(tb, "suspending...\n"); 1009 tb_switch_suspend(tb->root_switch); 1010 tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ 1011 tb_dbg(tb, "suspend finished\n"); 1012 1013 return 0; 1014 } 1015 1016 static void tb_restore_children(struct tb_switch *sw) 1017 { 1018 struct tb_port *port; 1019 1020 if (tb_enable_tmu(sw)) 1021 tb_sw_warn(sw, "failed to restore TMU configuration\n"); 1022 1023 tb_switch_for_each_port(sw, port) { 1024 if (!tb_port_has_remote(port)) 1025 continue; 1026 1027 if (tb_switch_lane_bonding_enable(port->remote->sw)) 1028 dev_warn(&sw->dev, "failed to restore lane bonding\n"); 1029 1030 tb_restore_children(port->remote->sw); 1031 } 1032 } 1033 1034 static int tb_resume_noirq(struct tb *tb) 1035 { 1036 struct tb_cm *tcm = tb_priv(tb); 1037 struct tb_tunnel *tunnel, *n; 1038 1039 tb_dbg(tb, "resuming...\n"); 1040 1041 /* remove any pci devices the firmware might have setup */ 1042 tb_switch_reset(tb, 0); 1043 1044 tb_switch_resume(tb->root_switch); 1045 tb_free_invalid_tunnels(tb); 1046 tb_free_unplugged_children(tb->root_switch); 1047 tb_restore_children(tb->root_switch); 1048 list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) 1049 tb_tunnel_restart(tunnel); 1050 if (!list_empty(&tcm->tunnel_list)) { 1051 /* 1052 * the pcie links need some time to get going. 1053 * 100ms works for me... 1054 */ 1055 tb_dbg(tb, "tunnels restarted, sleeping for 100ms\n"); 1056 msleep(100); 1057 } 1058 /* Allow tb_handle_hotplug to progress events */ 1059 tcm->hotplug_active = true; 1060 tb_dbg(tb, "resume finished\n"); 1061 1062 return 0; 1063 } 1064 1065 static int tb_free_unplugged_xdomains(struct tb_switch *sw) 1066 { 1067 struct tb_port *port; 1068 int ret = 0; 1069 1070 tb_switch_for_each_port(sw, port) { 1071 if (tb_is_upstream_port(port)) 1072 continue; 1073 if (port->xdomain && port->xdomain->is_unplugged) { 1074 tb_xdomain_remove(port->xdomain); 1075 port->xdomain = NULL; 1076 ret++; 1077 } else if (port->remote) { 1078 ret += tb_free_unplugged_xdomains(port->remote->sw); 1079 } 1080 } 1081 1082 return ret; 1083 } 1084 1085 static void tb_complete(struct tb *tb) 1086 { 1087 /* 1088 * Release any unplugged XDomains and if there is a case where 1089 * another domain is swapped in place of unplugged XDomain we 1090 * need to run another rescan. 1091 */ 1092 mutex_lock(&tb->lock); 1093 if (tb_free_unplugged_xdomains(tb->root_switch)) 1094 tb_scan_switch(tb->root_switch); 1095 mutex_unlock(&tb->lock); 1096 } 1097 1098 static const struct tb_cm_ops tb_cm_ops = { 1099 .start = tb_start, 1100 .stop = tb_stop, 1101 .suspend_noirq = tb_suspend_noirq, 1102 .resume_noirq = tb_resume_noirq, 1103 .complete = tb_complete, 1104 .handle_event = tb_handle_event, 1105 .approve_switch = tb_tunnel_pci, 1106 .approve_xdomain_paths = tb_approve_xdomain_paths, 1107 .disconnect_xdomain_paths = tb_disconnect_xdomain_paths, 1108 }; 1109 1110 struct tb *tb_probe(struct tb_nhi *nhi) 1111 { 1112 struct tb_cm *tcm; 1113 struct tb *tb; 1114 1115 tb = tb_domain_alloc(nhi, sizeof(*tcm)); 1116 if (!tb) 1117 return NULL; 1118 1119 tb->security_level = TB_SECURITY_USER; 1120 tb->cm_ops = &tb_cm_ops; 1121 1122 tcm = tb_priv(tb); 1123 INIT_LIST_HEAD(&tcm->tunnel_list); 1124 INIT_LIST_HEAD(&tcm->dp_resources); 1125 1126 return tb; 1127 } 1128