drivers/thunderbolt/tb.c

   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_dp_resource(struct tb *tb, struct tb_port *port)
 109 {
 110         struct tb_cm *tcm = tb_priv(tb);
 111         struct tb_port *p;
 112
 113         list_for_each_entry(p, &tcm->dp_resources, list) {
 114                 if (p == port)
 115                         return;
 116         }
 117
 118         tb_port_dbg(port, "DP %s resource available discovered\n",
 119                     tb_port_is_dpin(port) ? "IN" : "OUT");
 120         list_add_tail(&port->list, &tcm->dp_resources);
 121 }
 122
 123 static void tb_discover_dp_resources(struct tb *tb)
 124 {
 125         struct tb_cm *tcm = tb_priv(tb);
 126         struct tb_tunnel *tunnel;
 127
 128         list_for_each_entry(tunnel, &tcm->tunnel_list, list) {
 129                 if (tb_tunnel_is_dp(tunnel))
 130                         tb_discover_dp_resource(tb, tunnel->dst_port);
 131         }
 132 }
 133
 134 static void tb_switch_discover_tunnels(struct tb_switch *sw,
 135                                        struct list_head *list,
 136                                        bool alloc_hopids)
 137 {
 138         struct tb *tb = sw->tb;
 139         struct tb_port *port;
 140
 141         tb_switch_for_each_port(sw, port) {
 142                 struct tb_tunnel *tunnel = NULL;
 143
 144                 switch (port->config.type) {
 145                 case TB_TYPE_DP_HDMI_IN:
 146                         tunnel = tb_tunnel_discover_dp(tb, port, alloc_hopids);
 147                         /*
 148                          * In case of DP tunnel exists, change host router's
 149                          * 1st children TMU mode to HiFi for CL0s to work.
 150                          */
 151                         if (tunnel)
 152                                 tb_switch_enable_tmu_1st_child(tb->root_switch,
 153                                                 TB_SWITCH_TMU_RATE_HIFI);
 154                         break;
 155
 156                 case TB_TYPE_PCIE_DOWN:
 157                         tunnel = tb_tunnel_discover_pci(tb, port, alloc_hopids);
 158                         break;
 159
 160                 case TB_TYPE_USB3_DOWN:
 161                         tunnel = tb_tunnel_discover_usb3(tb, port, alloc_hopids);
 162                         break;
 163
 164                 default:
 165                         break;
 166                 }
 167
 168                 if (tunnel)
 169                         list_add_tail(&tunnel->list, list);
 170         }
 171
 172         tb_switch_for_each_port(sw, port) {
 173                 if (tb_port_has_remote(port)) {
 174                         tb_switch_discover_tunnels(port->remote->sw, list,
 175                                                    alloc_hopids);
 176                 }
 177         }
 178 }
 179
 180 static void tb_discover_tunnels(struct tb *tb)
 181 {
 182         struct tb_cm *tcm = tb_priv(tb);
 183         struct tb_tunnel *tunnel;
 184
 185         tb_switch_discover_tunnels(tb->root_switch, &tcm->tunnel_list, true);
 186
 187         list_for_each_entry(tunnel, &tcm->tunnel_list, list) {
 188                 if (tb_tunnel_is_pci(tunnel)) {
 189                         struct tb_switch *parent = tunnel->dst_port->sw;
 190
 191                         while (parent != tunnel->src_port->sw) {
 192                                 parent->boot = true;
 193                                 parent = tb_switch_parent(parent);
 194                         }
 195                 } else if (tb_tunnel_is_dp(tunnel)) {
 196                         /* Keep the domain from powering down */
 197                         pm_runtime_get_sync(&tunnel->src_port->sw->dev);
 198                         pm_runtime_get_sync(&tunnel->dst_port->sw->dev);
 199                 }
 200         }
 201 }
 202
 203 static int tb_port_configure_xdomain(struct tb_port *port, struct tb_xdomain *xd)
 204 {
 205         if (tb_switch_is_usb4(port->sw))
 206                 return usb4_port_configure_xdomain(port, xd);
 207         return tb_lc_configure_xdomain(port);
 208 }
 209
 210 static void tb_port_unconfigure_xdomain(struct tb_port *port)
 211 {
 212         if (tb_switch_is_usb4(port->sw))
 213                 usb4_port_unconfigure_xdomain(port);
 214         else
 215                 tb_lc_unconfigure_xdomain(port);
 216
 217         tb_port_enable(port->dual_link_port);
 218 }
 219
 220 static void tb_scan_xdomain(struct tb_port *port)
 221 {
 222         struct tb_switch *sw = port->sw;
 223         struct tb *tb = sw->tb;
 224         struct tb_xdomain *xd;
 225         u64 route;
 226
 227         if (!tb_is_xdomain_enabled())
 228                 return;
 229
 230         route = tb_downstream_route(port);
 231         xd = tb_xdomain_find_by_route(tb, route);
 232         if (xd) {
 233                 tb_xdomain_put(xd);
 234                 return;
 235         }
 236
 237         xd = tb_xdomain_alloc(tb, &sw->dev, route, tb->root_switch->uuid,
 238                               NULL);
 239         if (xd) {
 240                 tb_port_at(route, sw)->xdomain = xd;
 241                 tb_port_configure_xdomain(port, xd);
 242                 tb_xdomain_add(xd);
 243         }
 244 }
 245
 246 static int tb_enable_tmu(struct tb_switch *sw)
 247 {
 248         int ret;
 249
 250         /* If it is already enabled in correct mode, don't touch it */
 251         if (tb_switch_tmu_is_enabled(sw, sw->tmu.unidirectional_request))
 252                 return 0;
 253
 254         ret = tb_switch_tmu_disable(sw);
 255         if (ret)
 256                 return ret;
 257
 258         ret = tb_switch_tmu_post_time(sw);
 259         if (ret)
 260                 return ret;
 261
 262         return tb_switch_tmu_enable(sw);
 263 }
 264
 265 /**
 266  * tb_find_unused_port() - return the first inactive port on @sw
 267  * @sw: Switch to find the port on
 268  * @type: Port type to look for
 269  */
 270 static struct tb_port *tb_find_unused_port(struct tb_switch *sw,
 271                                            enum tb_port_type type)
 272 {
 273         struct tb_port *port;
 274
 275         tb_switch_for_each_port(sw, port) {
 276                 if (tb_is_upstream_port(port))
 277                         continue;
 278                 if (port->config.type != type)
 279                         continue;
 280                 if (!port->cap_adap)
 281                         continue;
 282                 if (tb_port_is_enabled(port))
 283                         continue;
 284                 return port;
 285         }
 286         return NULL;
 287 }
 288
 289 static struct tb_port *tb_find_usb3_down(struct tb_switch *sw,
 290                                          const struct tb_port *port)
 291 {
 292         struct tb_port *down;
 293
 294         down = usb4_switch_map_usb3_down(sw, port);
 295         if (down && !tb_usb3_port_is_enabled(down))
 296                 return down;
 297         return NULL;
 298 }
 299
 300 static struct tb_tunnel *tb_find_tunnel(struct tb *tb, enum tb_tunnel_type type,
 301                                         struct tb_port *src_port,
 302                                         struct tb_port *dst_port)
 303 {
 304         struct tb_cm *tcm = tb_priv(tb);
 305         struct tb_tunnel *tunnel;
 306
 307         list_for_each_entry(tunnel, &tcm->tunnel_list, list) {
 308                 if (tunnel->type == type &&
 309                     ((src_port && src_port == tunnel->src_port) ||
 310                      (dst_port && dst_port == tunnel->dst_port))) {
 311                         return tunnel;
 312                 }
 313         }
 314
 315         return NULL;
 316 }
 317
 318 static struct tb_tunnel *tb_find_first_usb3_tunnel(struct tb *tb,
 319                                                    struct tb_port *src_port,
 320                                                    struct tb_port *dst_port)
 321 {
 322         struct tb_port *port, *usb3_down;
 323         struct tb_switch *sw;
 324
 325         /* Pick the router that is deepest in the topology */
 326         if (dst_port->sw->config.depth > src_port->sw->config.depth)
 327                 sw = dst_port->sw;
 328         else
 329                 sw = src_port->sw;
 330
 331         /* Can't be the host router */
 332         if (sw == tb->root_switch)
 333                 return NULL;
 334
 335         /* Find the downstream USB4 port that leads to this router */
 336         port = tb_port_at(tb_route(sw), tb->root_switch);
 337         /* Find the corresponding host router USB3 downstream port */
 338         usb3_down = usb4_switch_map_usb3_down(tb->root_switch, port);
 339         if (!usb3_down)
 340                 return NULL;
 341
 342         return tb_find_tunnel(tb, TB_TUNNEL_USB3, usb3_down, NULL);
 343 }
 344
 345 static int tb_available_bandwidth(struct tb *tb, struct tb_port *src_port,
 346         struct tb_port *dst_port, int *available_up, int *available_down)
 347 {
 348         int usb3_consumed_up, usb3_consumed_down, ret;
 349         struct tb_cm *tcm = tb_priv(tb);
 350         struct tb_tunnel *tunnel;
 351         struct tb_port *port;
 352
 353         tb_port_dbg(dst_port, "calculating available bandwidth\n");
 354
 355         tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port);
 356         if (tunnel) {
 357                 ret = tb_tunnel_consumed_bandwidth(tunnel, &usb3_consumed_up,
 358                                                    &usb3_consumed_down);
 359                 if (ret)
 360                         return ret;
 361         } else {
 362                 usb3_consumed_up = 0;
 363                 usb3_consumed_down = 0;
 364         }
 365
 366         *available_up = *available_down = 40000;
 367
 368         /* Find the minimum available bandwidth over all links */
 369         tb_for_each_port_on_path(src_port, dst_port, port) {
 370                 int link_speed, link_width, up_bw, down_bw;
 371
 372                 if (!tb_port_is_null(port))
 373                         continue;
 374
 375                 if (tb_is_upstream_port(port)) {
 376                         link_speed = port->sw->link_speed;
 377                 } else {
 378                         link_speed = tb_port_get_link_speed(port);
 379                         if (link_speed < 0)
 380                                 return link_speed;
 381                 }
 382
 383                 link_width = port->bonded ? 2 : 1;
 384
 385                 up_bw = link_speed * link_width * 1000; /* Mb/s */
 386                 /* Leave 10% guard band */
 387                 up_bw -= up_bw / 10;
 388                 down_bw = up_bw;
 389
 390                 tb_port_dbg(port, "link total bandwidth %d Mb/s\n", up_bw);
 391
 392                 /*
 393                  * Find all DP tunnels that cross the port and reduce
 394                  * their consumed bandwidth from the available.
 395                  */
 396                 list_for_each_entry(tunnel, &tcm->tunnel_list, list) {
 397                         int dp_consumed_up, dp_consumed_down;
 398
 399                         if (!tb_tunnel_is_dp(tunnel))
 400                                 continue;
 401
 402                         if (!tb_tunnel_port_on_path(tunnel, port))
 403                                 continue;
 404
 405                         ret = tb_tunnel_consumed_bandwidth(tunnel,
 406                                                            &dp_consumed_up,
 407                                                            &dp_consumed_down);
 408                         if (ret)
 409                                 return ret;
 410
 411                         up_bw -= dp_consumed_up;
 412                         down_bw -= dp_consumed_down;
 413                 }
 414
 415                 /*
 416                  * If USB3 is tunneled from the host router down to the
 417                  * branch leading to port we need to take USB3 consumed
 418                  * bandwidth into account regardless whether it actually
 419                  * crosses the port.
 420                  */
 421                 up_bw -= usb3_consumed_up;
 422                 down_bw -= usb3_consumed_down;
 423
 424                 if (up_bw < *available_up)
 425                         *available_up = up_bw;
 426                 if (down_bw < *available_down)
 427                         *available_down = down_bw;
 428         }
 429
 430         if (*available_up < 0)
 431                 *available_up = 0;
 432         if (*available_down < 0)
 433                 *available_down = 0;
 434
 435         return 0;
 436 }
 437
 438 static int tb_release_unused_usb3_bandwidth(struct tb *tb,
 439                                             struct tb_port *src_port,
 440                                             struct tb_port *dst_port)
 441 {
 442         struct tb_tunnel *tunnel;
 443
 444         tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port);
 445         return tunnel ? tb_tunnel_release_unused_bandwidth(tunnel) : 0;
 446 }
 447
 448 static void tb_reclaim_usb3_bandwidth(struct tb *tb, struct tb_port *src_port,
 449                                       struct tb_port *dst_port)
 450 {
 451         int ret, available_up, available_down;
 452         struct tb_tunnel *tunnel;
 453
 454         tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port);
 455         if (!tunnel)
 456                 return;
 457
 458         tb_dbg(tb, "reclaiming unused bandwidth for USB3\n");
 459
 460         /*
 461          * Calculate available bandwidth for the first hop USB3 tunnel.
 462          * That determines the whole USB3 bandwidth for this branch.
 463          */
 464         ret = tb_available_bandwidth(tb, tunnel->src_port, tunnel->dst_port,
 465                                      &available_up, &available_down);
 466         if (ret) {
 467                 tb_warn(tb, "failed to calculate available bandwidth\n");
 468                 return;
 469         }
 470
 471         tb_dbg(tb, "available bandwidth for USB3 %d/%d Mb/s\n",
 472                available_up, available_down);
 473
 474         tb_tunnel_reclaim_available_bandwidth(tunnel, &available_up, &available_down);
 475 }
 476
 477 static int tb_tunnel_usb3(struct tb *tb, struct tb_switch *sw)
 478 {
 479         struct tb_switch *parent = tb_switch_parent(sw);
 480         int ret, available_up, available_down;
 481         struct tb_port *up, *down, *port;
 482         struct tb_cm *tcm = tb_priv(tb);
 483         struct tb_tunnel *tunnel;
 484
 485         if (!tb_acpi_may_tunnel_usb3()) {
 486                 tb_dbg(tb, "USB3 tunneling disabled, not creating tunnel\n");
 487                 return 0;
 488         }
 489
 490         up = tb_switch_find_port(sw, TB_TYPE_USB3_UP);
 491         if (!up)
 492                 return 0;
 493
 494         if (!sw->link_usb4)
 495                 return 0;
 496
 497         /*
 498          * Look up available down port. Since we are chaining it should
 499          * be found right above this switch.
 500          */
 501         port = tb_port_at(tb_route(sw), parent);
 502         down = tb_find_usb3_down(parent, port);
 503         if (!down)
 504                 return 0;
 505
 506         if (tb_route(parent)) {
 507                 struct tb_port *parent_up;
 508                 /*
 509                  * Check first that the parent switch has its upstream USB3
 510                  * port enabled. Otherwise the chain is not complete and
 511                  * there is no point setting up a new tunnel.
 512                  */
 513                 parent_up = tb_switch_find_port(parent, TB_TYPE_USB3_UP);
 514                 if (!parent_up || !tb_port_is_enabled(parent_up))
 515                         return 0;
 516
 517                 /* Make all unused bandwidth available for the new tunnel */
 518                 ret = tb_release_unused_usb3_bandwidth(tb, down, up);
 519                 if (ret)
 520                         return ret;
 521         }
 522
 523         ret = tb_available_bandwidth(tb, down, up, &available_up,
 524                                      &available_down);
 525         if (ret)
 526                 goto err_reclaim;
 527
 528         tb_port_dbg(up, "available bandwidth for new USB3 tunnel %d/%d Mb/s\n",
 529                     available_up, available_down);
 530
 531         tunnel = tb_tunnel_alloc_usb3(tb, up, down, available_up,
 532                                       available_down);
 533         if (!tunnel) {
 534                 ret = -ENOMEM;
 535                 goto err_reclaim;
 536         }
 537
 538         if (tb_tunnel_activate(tunnel)) {
 539                 tb_port_info(up,
 540                              "USB3 tunnel activation failed, aborting\n");
 541                 ret = -EIO;
 542                 goto err_free;
 543         }
 544
 545         list_add_tail(&tunnel->list, &tcm->tunnel_list);
 546         if (tb_route(parent))
 547                 tb_reclaim_usb3_bandwidth(tb, down, up);
 548
 549         return 0;
 550
 551 err_free:
 552         tb_tunnel_free(tunnel);
 553 err_reclaim:
 554         if (tb_route(parent))
 555                 tb_reclaim_usb3_bandwidth(tb, down, up);
 556
 557         return ret;
 558 }
 559
 560 static int tb_create_usb3_tunnels(struct tb_switch *sw)
 561 {
 562         struct tb_port *port;
 563         int ret;
 564
 565         if (!tb_acpi_may_tunnel_usb3())
 566                 return 0;
 567
 568         if (tb_route(sw)) {
 569                 ret = tb_tunnel_usb3(sw->tb, sw);
 570                 if (ret)
 571                         return ret;
 572         }
 573
 574         tb_switch_for_each_port(sw, port) {
 575                 if (!tb_port_has_remote(port))
 576                         continue;
 577                 ret = tb_create_usb3_tunnels(port->remote->sw);
 578                 if (ret)
 579                         return ret;
 580         }
 581
 582         return 0;
 583 }
 584
 585 static void tb_scan_port(struct tb_port *port);
 586
 587 /*
 588  * tb_scan_switch() - scan for and initialize downstream switches
 589  */
 590 static void tb_scan_switch(struct tb_switch *sw)
 591 {
 592         struct tb_port *port;
 593
 594         pm_runtime_get_sync(&sw->dev);
 595
 596         tb_switch_for_each_port(sw, port)
 597                 tb_scan_port(port);
 598
 599         pm_runtime_mark_last_busy(&sw->dev);
 600         pm_runtime_put_autosuspend(&sw->dev);
 601 }
 602
 603 /*
 604  * tb_scan_port() - check for and initialize switches below port
 605  */
 606 static void tb_scan_port(struct tb_port *port)
 607 {
 608         struct tb_cm *tcm = tb_priv(port->sw->tb);
 609         struct tb_port *upstream_port;
 610         struct tb_switch *sw;
 611         int ret;
 612
 613         if (tb_is_upstream_port(port))
 614                 return;
 615
 616         if (tb_port_is_dpout(port) && tb_dp_port_hpd_is_active(port) == 1 &&
 617             !tb_dp_port_is_enabled(port)) {
 618                 tb_port_dbg(port, "DP adapter HPD set, queuing hotplug\n");
 619                 tb_queue_hotplug(port->sw->tb, tb_route(port->sw), port->port,
 620                                  false);
 621                 return;
 622         }
 623
 624         if (port->config.type != TB_TYPE_PORT)
 625                 return;
 626         if (port->dual_link_port && port->link_nr)
 627                 return; /*
 628                          * Downstream switch is reachable through two ports.
 629                          * Only scan on the primary port (link_nr == 0).
 630                          */
 631         if (tb_wait_for_port(port, false) <= 0)
 632                 return;
 633         if (port->remote) {
 634                 tb_port_dbg(port, "port already has a remote\n");
 635                 return;
 636         }
 637
 638         tb_retimer_scan(port, true);
 639
 640         sw = tb_switch_alloc(port->sw->tb, &port->sw->dev,
 641                              tb_downstream_route(port));
 642         if (IS_ERR(sw)) {
 643                 /*
 644                  * If there is an error accessing the connected switch
 645                  * it may be connected to another domain. Also we allow
 646                  * the other domain to be connected to a max depth switch.
 647                  */
 648                 if (PTR_ERR(sw) == -EIO || PTR_ERR(sw) == -EADDRNOTAVAIL)
 649                         tb_scan_xdomain(port);
 650                 return;
 651         }
 652
 653         if (tb_switch_configure(sw)) {
 654                 tb_switch_put(sw);
 655                 return;
 656         }
 657
 658         /*
 659          * If there was previously another domain connected remove it
 660          * first.
 661          */
 662         if (port->xdomain) {
 663                 tb_xdomain_remove(port->xdomain);
 664                 tb_port_unconfigure_xdomain(port);
 665                 port->xdomain = NULL;
 666         }
 667
 668         /*
 669          * Do not send uevents until we have discovered all existing
 670          * tunnels and know which switches were authorized already by
 671          * the boot firmware.
 672          */
 673         if (!tcm->hotplug_active)
 674                 dev_set_uevent_suppress(&sw->dev, true);
 675
 676         /*
 677          * At the moment Thunderbolt 2 and beyond (devices with LC) we
 678          * can support runtime PM.
 679          */
 680         sw->rpm = sw->generation > 1;
 681
 682         if (tb_switch_add(sw)) {
 683                 tb_switch_put(sw);
 684                 return;
 685         }
 686
 687         /* Link the switches using both links if available */
 688         upstream_port = tb_upstream_port(sw);
 689         port->remote = upstream_port;
 690         upstream_port->remote = port;
 691         if (port->dual_link_port && upstream_port->dual_link_port) {
 692                 port->dual_link_port->remote = upstream_port->dual_link_port;
 693                 upstream_port->dual_link_port->remote = port->dual_link_port;
 694         }
 695
 696         /* Enable lane bonding if supported */
 697         tb_switch_lane_bonding_enable(sw);
 698         /* Set the link configured */
 699         tb_switch_configure_link(sw);
 700         /*
 701          * CL0s and CL1 are enabled and supported together.
 702          * Silently ignore CLx enabling in case CLx is not supported.
 703          */
 704         ret = tb_switch_enable_clx(sw, TB_CL1);
 705         if (ret && ret != -EOPNOTSUPP)
 706                 tb_sw_warn(sw, "failed to enable %s on upstream port\n",
 707                            tb_switch_clx_name(TB_CL1));
 708
 709         if (tb_switch_is_clx_enabled(sw, TB_CL1))
 710                 /*
 711                  * To support highest CLx state, we set router's TMU to
 712                  * Normal-Uni mode.
 713                  */
 714                 tb_switch_tmu_configure(sw, TB_SWITCH_TMU_RATE_NORMAL, true);
 715         else
 716                 /* If CLx disabled, configure router's TMU to HiFi-Bidir mode*/
 717                 tb_switch_tmu_configure(sw, TB_SWITCH_TMU_RATE_HIFI, false);
 718
 719         if (tb_enable_tmu(sw))
 720                 tb_sw_warn(sw, "failed to enable TMU\n");
 721
 722         /* Scan upstream retimers */
 723         tb_retimer_scan(upstream_port, true);
 724
 725         /*
 726          * Create USB 3.x tunnels only when the switch is plugged to the
 727          * domain. This is because we scan the domain also during discovery
 728          * and want to discover existing USB 3.x tunnels before we create
 729          * any new.
 730          */
 731         if (tcm->hotplug_active && tb_tunnel_usb3(sw->tb, sw))
 732                 tb_sw_warn(sw, "USB3 tunnel creation failed\n");
 733
 734         tb_add_dp_resources(sw);
 735         tb_scan_switch(sw);
 736 }
 737
 738 static void tb_deactivate_and_free_tunnel(struct tb_tunnel *tunnel)
 739 {
 740         struct tb_port *src_port, *dst_port;
 741         struct tb *tb;
 742
 743         if (!tunnel)
 744                 return;
 745
 746         tb_tunnel_deactivate(tunnel);
 747         list_del(&tunnel->list);
 748
 749         tb = tunnel->tb;
 750         src_port = tunnel->src_port;
 751         dst_port = tunnel->dst_port;
 752
 753         switch (tunnel->type) {
 754         case TB_TUNNEL_DP:
 755                 /*
 756                  * In case of DP tunnel make sure the DP IN resource is
 757                  * deallocated properly.
 758                  */
 759                 tb_switch_dealloc_dp_resource(src_port->sw, src_port);
 760                 /* Now we can allow the domain to runtime suspend again */
 761                 pm_runtime_mark_last_busy(&dst_port->sw->dev);
 762                 pm_runtime_put_autosuspend(&dst_port->sw->dev);
 763                 pm_runtime_mark_last_busy(&src_port->sw->dev);
 764                 pm_runtime_put_autosuspend(&src_port->sw->dev);
 765                 fallthrough;
 766
 767         case TB_TUNNEL_USB3:
 768                 tb_reclaim_usb3_bandwidth(tb, src_port, dst_port);
 769                 break;
 770
 771         default:
 772                 /*
 773                  * PCIe and DMA tunnels do not consume guaranteed
 774                  * bandwidth.
 775                  */
 776                 break;
 777         }
 778
 779         tb_tunnel_free(tunnel);
 780 }
 781
 782 /*
 783  * tb_free_invalid_tunnels() - destroy tunnels of devices that have gone away
 784  */
 785 static void tb_free_invalid_tunnels(struct tb *tb)
 786 {
 787         struct tb_cm *tcm = tb_priv(tb);
 788         struct tb_tunnel *tunnel;
 789         struct tb_tunnel *n;
 790
 791         list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {
 792                 if (tb_tunnel_is_invalid(tunnel))
 793                         tb_deactivate_and_free_tunnel(tunnel);
 794         }
 795 }
 796
 797 /*
 798  * tb_free_unplugged_children() - traverse hierarchy and free unplugged switches
 799  */
 800 static void tb_free_unplugged_children(struct tb_switch *sw)
 801 {
 802         struct tb_port *port;
 803
 804         tb_switch_for_each_port(sw, port) {
 805                 if (!tb_port_has_remote(port))
 806                         continue;
 807
 808                 if (port->remote->sw->is_unplugged) {
 809                         tb_retimer_remove_all(port);
 810                         tb_remove_dp_resources(port->remote->sw);
 811                         tb_switch_unconfigure_link(port->remote->sw);
 812                         tb_switch_lane_bonding_disable(port->remote->sw);
 813                         tb_switch_remove(port->remote->sw);
 814                         port->remote = NULL;
 815                         if (port->dual_link_port)
 816                                 port->dual_link_port->remote = NULL;
 817                 } else {
 818                         tb_free_unplugged_children(port->remote->sw);
 819                 }
 820         }
 821 }
 822
 823 static struct tb_port *tb_find_pcie_down(struct tb_switch *sw,
 824                                          const struct tb_port *port)
 825 {
 826         struct tb_port *down = NULL;
 827
 828         /*
 829          * To keep plugging devices consistently in the same PCIe
 830          * hierarchy, do mapping here for switch downstream PCIe ports.
 831          */
 832         if (tb_switch_is_usb4(sw)) {
 833                 down = usb4_switch_map_pcie_down(sw, port);
 834         } else if (!tb_route(sw)) {
 835                 int phy_port = tb_phy_port_from_link(port->port);
 836                 int index;
 837
 838                 /*
 839                  * Hard-coded Thunderbolt port to PCIe down port mapping
 840                  * per controller.
 841                  */
 842                 if (tb_switch_is_cactus_ridge(sw) ||
 843                     tb_switch_is_alpine_ridge(sw))
 844                         index = !phy_port ? 6 : 7;
 845                 else if (tb_switch_is_falcon_ridge(sw))
 846                         index = !phy_port ? 6 : 8;
 847                 else if (tb_switch_is_titan_ridge(sw))
 848                         index = !phy_port ? 8 : 9;
 849                 else
 850                         goto out;
 851
 852                 /* Validate the hard-coding */
 853                 if (WARN_ON(index > sw->config.max_port_number))
 854                         goto out;
 855
 856                 down = &sw->ports[index];
 857         }
 858
 859         if (down) {
 860                 if (WARN_ON(!tb_port_is_pcie_down(down)))
 861                         goto out;
 862                 if (tb_pci_port_is_enabled(down))
 863                         goto out;
 864
 865                 return down;
 866         }
 867
 868 out:
 869         return tb_find_unused_port(sw, TB_TYPE_PCIE_DOWN);
 870 }
 871
 872 static struct tb_port *tb_find_dp_out(struct tb *tb, struct tb_port *in)
 873 {
 874         struct tb_port *host_port, *port;
 875         struct tb_cm *tcm = tb_priv(tb);
 876
 877         host_port = tb_route(in->sw) ?
 878                 tb_port_at(tb_route(in->sw), tb->root_switch) : NULL;
 879
 880         list_for_each_entry(port, &tcm->dp_resources, list) {
 881                 if (!tb_port_is_dpout(port))
 882                         continue;
 883
 884                 if (tb_port_is_enabled(port)) {
 885                         tb_port_dbg(port, "in use\n");
 886                         continue;
 887                 }
 888
 889                 tb_port_dbg(port, "DP OUT available\n");
 890
 891                 /*
 892                  * Keep the DP tunnel under the topology starting from
 893                  * the same host router downstream port.
 894                  */
 895                 if (host_port && tb_route(port->sw)) {
 896                         struct tb_port *p;
 897
 898                         p = tb_port_at(tb_route(port->sw), tb->root_switch);
 899                         if (p != host_port)
 900                                 continue;
 901                 }
 902
 903                 return port;
 904         }
 905
 906         return NULL;
 907 }
 908
 909 static void tb_tunnel_dp(struct tb *tb)
 910 {
 911         int available_up, available_down, ret, link_nr;
 912         struct tb_cm *tcm = tb_priv(tb);
 913         struct tb_port *port, *in, *out;
 914         struct tb_tunnel *tunnel;
 915
 916         if (!tb_acpi_may_tunnel_dp()) {
 917                 tb_dbg(tb, "DP tunneling disabled, not creating tunnel\n");
 918                 return;
 919         }
 920
 921         /*
 922          * Find pair of inactive DP IN and DP OUT adapters and then
 923          * establish a DP tunnel between them.
 924          */
 925         tb_dbg(tb, "looking for DP IN <-> DP OUT pairs:\n");
 926
 927         in = NULL;
 928         out = NULL;
 929         list_for_each_entry(port, &tcm->dp_resources, list) {
 930                 if (!tb_port_is_dpin(port))
 931                         continue;
 932
 933                 if (tb_port_is_enabled(port)) {
 934                         tb_port_dbg(port, "in use\n");
 935                         continue;
 936                 }
 937
 938                 tb_port_dbg(port, "DP IN available\n");
 939
 940                 out = tb_find_dp_out(tb, port);
 941                 if (out) {
 942                         in = port;
 943                         break;
 944                 }
 945         }
 946
 947         if (!in) {
 948                 tb_dbg(tb, "no suitable DP IN adapter available, not tunneling\n");
 949                 return;
 950         }
 951         if (!out) {
 952                 tb_dbg(tb, "no suitable DP OUT adapter available, not tunneling\n");
 953                 return;
 954         }
 955
 956         /*
 957          * This is only applicable to links that are not bonded (so
 958          * when Thunderbolt 1 hardware is involved somewhere in the
 959          * topology). For these try to share the DP bandwidth between
 960          * the two lanes.
 961          */
 962         link_nr = 1;
 963         list_for_each_entry(tunnel, &tcm->tunnel_list, list) {
 964                 if (tb_tunnel_is_dp(tunnel)) {
 965                         link_nr = 0;
 966                         break;
 967                 }
 968         }
 969
 970         /*
 971          * DP stream needs the domain to be active so runtime resume
 972          * both ends of the tunnel.
 973          *
 974          * This should bring the routers in the middle active as well
 975          * and keeps the domain from runtime suspending while the DP
 976          * tunnel is active.
 977          */
 978         pm_runtime_get_sync(&in->sw->dev);
 979         pm_runtime_get_sync(&out->sw->dev);
 980
 981         if (tb_switch_alloc_dp_resource(in->sw, in)) {
 982                 tb_port_dbg(in, "no resource available for DP IN, not tunneling\n");
 983                 goto err_rpm_put;
 984         }
 985
 986         /* Make all unused USB3 bandwidth available for the new DP tunnel */
 987         ret = tb_release_unused_usb3_bandwidth(tb, in, out);
 988         if (ret) {
 989                 tb_warn(tb, "failed to release unused bandwidth\n");
 990                 goto err_dealloc_dp;
 991         }
 992
 993         ret = tb_available_bandwidth(tb, in, out, &available_up,
 994                                      &available_down);
 995         if (ret)
 996                 goto err_reclaim;
 997
 998         tb_dbg(tb, "available bandwidth for new DP tunnel %u/%u Mb/s\n",
 999                available_up, available_down);
1000
1001         tunnel = tb_tunnel_alloc_dp(tb, in, out, link_nr, available_up,
1002                                     available_down);
1003         if (!tunnel) {
1004                 tb_port_dbg(out, "could not allocate DP tunnel\n");
1005                 goto err_reclaim;
1006         }
1007
1008         if (tb_tunnel_activate(tunnel)) {
1009                 tb_port_info(out, "DP tunnel activation failed, aborting\n");
1010                 goto err_free;
1011         }
1012
1013         list_add_tail(&tunnel->list, &tcm->tunnel_list);
1014         tb_reclaim_usb3_bandwidth(tb, in, out);
1015         /*
1016          * In case of DP tunnel exists, change host router's 1st children
1017          * TMU mode to HiFi for CL0s to work.
1018          */
1019         tb_switch_enable_tmu_1st_child(tb->root_switch, TB_SWITCH_TMU_RATE_HIFI);
1020
1021         return;
1022
1023 err_free:
1024         tb_tunnel_free(tunnel);
1025 err_reclaim:
1026         tb_reclaim_usb3_bandwidth(tb, in, out);
1027 err_dealloc_dp:
1028         tb_switch_dealloc_dp_resource(in->sw, in);
1029 err_rpm_put:
1030         pm_runtime_mark_last_busy(&out->sw->dev);
1031         pm_runtime_put_autosuspend(&out->sw->dev);
1032         pm_runtime_mark_last_busy(&in->sw->dev);
1033         pm_runtime_put_autosuspend(&in->sw->dev);
1034 }
1035
1036 static void tb_dp_resource_unavailable(struct tb *tb, struct tb_port *port)
1037 {
1038         struct tb_port *in, *out;
1039         struct tb_tunnel *tunnel;
1040
1041         if (tb_port_is_dpin(port)) {
1042                 tb_port_dbg(port, "DP IN resource unavailable\n");
1043                 in = port;
1044                 out = NULL;
1045         } else {
1046                 tb_port_dbg(port, "DP OUT resource unavailable\n");
1047                 in = NULL;
1048                 out = port;
1049         }
1050
1051         tunnel = tb_find_tunnel(tb, TB_TUNNEL_DP, in, out);
1052         tb_deactivate_and_free_tunnel(tunnel);
1053         list_del_init(&port->list);
1054
1055         /*
1056          * See if there is another DP OUT port that can be used for
1057          * to create another tunnel.
1058          */
1059         tb_tunnel_dp(tb);
1060 }
1061
1062 static void tb_dp_resource_available(struct tb *tb, struct tb_port *port)
1063 {
1064         struct tb_cm *tcm = tb_priv(tb);
1065         struct tb_port *p;
1066
1067         if (tb_port_is_enabled(port))
1068                 return;
1069
1070         list_for_each_entry(p, &tcm->dp_resources, list) {
1071                 if (p == port)
1072                         return;
1073         }
1074
1075         tb_port_dbg(port, "DP %s resource available\n",
1076                     tb_port_is_dpin(port) ? "IN" : "OUT");
1077         list_add_tail(&port->list, &tcm->dp_resources);
1078
1079         /* Look for suitable DP IN <-> DP OUT pairs now */
1080         tb_tunnel_dp(tb);
1081 }
1082
1083 static void tb_disconnect_and_release_dp(struct tb *tb)
1084 {
1085         struct tb_cm *tcm = tb_priv(tb);
1086         struct tb_tunnel *tunnel, *n;
1087
1088         /*
1089          * Tear down all DP tunnels and release their resources. They
1090          * will be re-established after resume based on plug events.
1091          */
1092         list_for_each_entry_safe_reverse(tunnel, n, &tcm->tunnel_list, list) {
1093                 if (tb_tunnel_is_dp(tunnel))
1094                         tb_deactivate_and_free_tunnel(tunnel);
1095         }
1096
1097         while (!list_empty(&tcm->dp_resources)) {
1098                 struct tb_port *port;
1099
1100                 port = list_first_entry(&tcm->dp_resources,
1101                                         struct tb_port, list);
1102                 list_del_init(&port->list);
1103         }
1104 }
1105
1106 static int tb_disconnect_pci(struct tb *tb, struct tb_switch *sw)
1107 {
1108         struct tb_tunnel *tunnel;
1109         struct tb_port *up;
1110
1111         up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP);
1112         if (WARN_ON(!up))
1113                 return -ENODEV;
1114
1115         tunnel = tb_find_tunnel(tb, TB_TUNNEL_PCI, NULL, up);
1116         if (WARN_ON(!tunnel))
1117                 return -ENODEV;
1118
1119         tb_switch_xhci_disconnect(sw);
1120
1121         tb_tunnel_deactivate(tunnel);
1122         list_del(&tunnel->list);
1123         tb_tunnel_free(tunnel);
1124         return 0;
1125 }
1126
1127 static int tb_tunnel_pci(struct tb *tb, struct tb_switch *sw)
1128 {
1129         struct tb_port *up, *down, *port;
1130         struct tb_cm *tcm = tb_priv(tb);
1131         struct tb_switch *parent_sw;
1132         struct tb_tunnel *tunnel;
1133
1134         up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP);
1135         if (!up)
1136                 return 0;
1137
1138         /*
1139          * Look up available down port. Since we are chaining it should
1140          * be found right above this switch.
1141          */
1142         parent_sw = tb_to_switch(sw->dev.parent);
1143         port = tb_port_at(tb_route(sw), parent_sw);
1144         down = tb_find_pcie_down(parent_sw, port);
1145         if (!down)
1146                 return 0;
1147
1148         tunnel = tb_tunnel_alloc_pci(tb, up, down);
1149         if (!tunnel)
1150                 return -ENOMEM;
1151
1152         if (tb_tunnel_activate(tunnel)) {
1153                 tb_port_info(up,
1154                              "PCIe tunnel activation failed, aborting\n");
1155                 tb_tunnel_free(tunnel);
1156                 return -EIO;
1157         }
1158
1159         /*
1160          * PCIe L1 is needed to enable CL0s for Titan Ridge so enable it
1161          * here.
1162          */
1163         if (tb_switch_pcie_l1_enable(sw))
1164                 tb_sw_warn(sw, "failed to enable PCIe L1 for Titan Ridge\n");
1165
1166         if (tb_switch_xhci_connect(sw))
1167                 tb_sw_warn(sw, "failed to connect xHCI\n");
1168
1169         list_add_tail(&tunnel->list, &tcm->tunnel_list);
1170         return 0;
1171 }
1172
1173 static int tb_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd,
1174                                     int transmit_path, int transmit_ring,
1175                                     int receive_path, int receive_ring)
1176 {
1177         struct tb_cm *tcm = tb_priv(tb);
1178         struct tb_port *nhi_port, *dst_port;
1179         struct tb_tunnel *tunnel;
1180         struct tb_switch *sw;
1181
1182         sw = tb_to_switch(xd->dev.parent);
1183         dst_port = tb_port_at(xd->route, sw);
1184         nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI);
1185
1186         mutex_lock(&tb->lock);
1187         tunnel = tb_tunnel_alloc_dma(tb, nhi_port, dst_port, transmit_path,
1188                                      transmit_ring, receive_path, receive_ring);
1189         if (!tunnel) {
1190                 mutex_unlock(&tb->lock);
1191                 return -ENOMEM;
1192         }
1193
1194         if (tb_tunnel_activate(tunnel)) {
1195                 tb_port_info(nhi_port,
1196                              "DMA tunnel activation failed, aborting\n");
1197                 tb_tunnel_free(tunnel);
1198                 mutex_unlock(&tb->lock);
1199                 return -EIO;
1200         }
1201
1202         list_add_tail(&tunnel->list, &tcm->tunnel_list);
1203         mutex_unlock(&tb->lock);
1204         return 0;
1205 }
1206
1207 static void __tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd,
1208                                           int transmit_path, int transmit_ring,
1209                                           int receive_path, int receive_ring)
1210 {
1211         struct tb_cm *tcm = tb_priv(tb);
1212         struct tb_port *nhi_port, *dst_port;
1213         struct tb_tunnel *tunnel, *n;
1214         struct tb_switch *sw;
1215
1216         sw = tb_to_switch(xd->dev.parent);
1217         dst_port = tb_port_at(xd->route, sw);
1218         nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI);
1219
1220         list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {
1221                 if (!tb_tunnel_is_dma(tunnel))
1222                         continue;
1223                 if (tunnel->src_port != nhi_port || tunnel->dst_port != dst_port)
1224                         continue;
1225
1226                 if (tb_tunnel_match_dma(tunnel, transmit_path, transmit_ring,
1227                                         receive_path, receive_ring))
1228                         tb_deactivate_and_free_tunnel(tunnel);
1229         }
1230 }
1231
1232 static int tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd,
1233                                        int transmit_path, int transmit_ring,
1234                                        int receive_path, int receive_ring)
1235 {
1236         if (!xd->is_unplugged) {
1237                 mutex_lock(&tb->lock);
1238                 __tb_disconnect_xdomain_paths(tb, xd, transmit_path,
1239                                               transmit_ring, receive_path,
1240                                               receive_ring);
1241                 mutex_unlock(&tb->lock);
1242         }
1243         return 0;
1244 }
1245
1246 /* hotplug handling */
1247
1248 /*
1249  * tb_handle_hotplug() - handle hotplug event
1250  *
1251  * Executes on tb->wq.
1252  */
1253 static void tb_handle_hotplug(struct work_struct *work)
1254 {
1255         struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work);
1256         struct tb *tb = ev->tb;
1257         struct tb_cm *tcm = tb_priv(tb);
1258         struct tb_switch *sw;
1259         struct tb_port *port;
1260
1261         /* Bring the domain back from sleep if it was suspended */
1262         pm_runtime_get_sync(&tb->dev);
1263
1264         mutex_lock(&tb->lock);
1265         if (!tcm->hotplug_active)
1266                 goto out; /* during init, suspend or shutdown */
1267
1268         sw = tb_switch_find_by_route(tb, ev->route);
1269         if (!sw) {
1270                 tb_warn(tb,
1271                         "hotplug event from non existent switch %llx:%x (unplug: %d)\n",
1272                         ev->route, ev->port, ev->unplug);
1273                 goto out;
1274         }
1275         if (ev->port > sw->config.max_port_number) {
1276                 tb_warn(tb,
1277                         "hotplug event from non existent port %llx:%x (unplug: %d)\n",
1278                         ev->route, ev->port, ev->unplug);
1279                 goto put_sw;
1280         }
1281         port = &sw->ports[ev->port];
1282         if (tb_is_upstream_port(port)) {
1283                 tb_dbg(tb, "hotplug event for upstream port %llx:%x (unplug: %d)\n",
1284                        ev->route, ev->port, ev->unplug);
1285                 goto put_sw;
1286         }
1287
1288         pm_runtime_get_sync(&sw->dev);
1289
1290         if (ev->unplug) {
1291                 tb_retimer_remove_all(port);
1292
1293                 if (tb_port_has_remote(port)) {
1294                         tb_port_dbg(port, "switch unplugged\n");
1295                         tb_sw_set_unplugged(port->remote->sw);
1296                         tb_free_invalid_tunnels(tb);
1297                         tb_remove_dp_resources(port->remote->sw);
1298                         tb_switch_tmu_disable(port->remote->sw);
1299                         tb_switch_unconfigure_link(port->remote->sw);
1300                         tb_switch_lane_bonding_disable(port->remote->sw);
1301                         tb_switch_remove(port->remote->sw);
1302                         port->remote = NULL;
1303                         if (port->dual_link_port)
1304                                 port->dual_link_port->remote = NULL;
1305                         /* Maybe we can create another DP tunnel */
1306                         tb_tunnel_dp(tb);
1307                 } else if (port->xdomain) {
1308                         struct tb_xdomain *xd = tb_xdomain_get(port->xdomain);
1309
1310                         tb_port_dbg(port, "xdomain unplugged\n");
1311                         /*
1312                          * Service drivers are unbound during
1313                          * tb_xdomain_remove() so setting XDomain as
1314                          * unplugged here prevents deadlock if they call
1315                          * tb_xdomain_disable_paths(). We will tear down
1316                          * all the tunnels below.
1317                          */
1318                         xd->is_unplugged = true;
1319                         tb_xdomain_remove(xd);
1320                         port->xdomain = NULL;
1321                         __tb_disconnect_xdomain_paths(tb, xd, -1, -1, -1, -1);
1322                         tb_xdomain_put(xd);
1323                         tb_port_unconfigure_xdomain(port);
1324                 } else if (tb_port_is_dpout(port) || tb_port_is_dpin(port)) {
1325                         tb_dp_resource_unavailable(tb, port);
1326                 } else if (!port->port) {
1327                         tb_sw_dbg(sw, "xHCI disconnect request\n");
1328                         tb_switch_xhci_disconnect(sw);
1329                 } else {
1330                         tb_port_dbg(port,
1331                                    "got unplug event for disconnected port, ignoring\n");
1332                 }
1333         } else if (port->remote) {
1334                 tb_port_dbg(port, "got plug event for connected port, ignoring\n");
1335         } else if (!port->port && sw->authorized) {
1336                 tb_sw_dbg(sw, "xHCI connect request\n");
1337                 tb_switch_xhci_connect(sw);
1338         } else {
1339                 if (tb_port_is_null(port)) {
1340                         tb_port_dbg(port, "hotplug: scanning\n");
1341                         tb_scan_port(port);
1342                         if (!port->remote)
1343                                 tb_port_dbg(port, "hotplug: no switch found\n");
1344                 } else if (tb_port_is_dpout(port) || tb_port_is_dpin(port)) {
1345                         tb_dp_resource_available(tb, port);
1346                 }
1347         }
1348
1349         pm_runtime_mark_last_busy(&sw->dev);
1350         pm_runtime_put_autosuspend(&sw->dev);
1351
1352 put_sw:
1353         tb_switch_put(sw);
1354 out:
1355         mutex_unlock(&tb->lock);
1356
1357         pm_runtime_mark_last_busy(&tb->dev);
1358         pm_runtime_put_autosuspend(&tb->dev);
1359
1360         kfree(ev);
1361 }
1362
1363 /*
1364  * tb_schedule_hotplug_handler() - callback function for the control channel
1365  *
1366  * Delegates to tb_handle_hotplug.
1367  */
1368 static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type,
1369                             const void *buf, size_t size)
1370 {
1371         const struct cfg_event_pkg *pkg = buf;
1372         u64 route;
1373
1374         if (type != TB_CFG_PKG_EVENT) {
1375                 tb_warn(tb, "unexpected event %#x, ignoring\n", type);
1376                 return;
1377         }
1378
1379         route = tb_cfg_get_route(&pkg->header);
1380
1381         if (tb_cfg_ack_plug(tb->ctl, route, pkg->port, pkg->unplug)) {
1382                 tb_warn(tb, "could not ack plug event on %llx:%x\n", route,
1383                         pkg->port);
1384         }
1385
1386         tb_queue_hotplug(tb, route, pkg->port, pkg->unplug);
1387 }
1388
1389 static void tb_stop(struct tb *tb)
1390 {
1391         struct tb_cm *tcm = tb_priv(tb);
1392         struct tb_tunnel *tunnel;
1393         struct tb_tunnel *n;
1394
1395         cancel_delayed_work(&tcm->remove_work);
1396         /* tunnels are only present after everything has been initialized */
1397         list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {
1398                 /*
1399                  * DMA tunnels require the driver to be functional so we
1400                  * tear them down. Other protocol tunnels can be left
1401                  * intact.
1402                  */
1403                 if (tb_tunnel_is_dma(tunnel))
1404                         tb_tunnel_deactivate(tunnel);
1405                 tb_tunnel_free(tunnel);
1406         }
1407         tb_switch_remove(tb->root_switch);
1408         tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */
1409 }
1410
1411 static int tb_scan_finalize_switch(struct device *dev, void *data)
1412 {
1413         if (tb_is_switch(dev)) {
1414                 struct tb_switch *sw = tb_to_switch(dev);
1415
1416                 /*
1417                  * If we found that the switch was already setup by the
1418                  * boot firmware, mark it as authorized now before we
1419                  * send uevent to userspace.
1420                  */
1421                 if (sw->boot)
1422                         sw->authorized = 1;
1423
1424                 dev_set_uevent_suppress(dev, false);
1425                 kobject_uevent(&dev->kobj, KOBJ_ADD);
1426                 device_for_each_child(dev, NULL, tb_scan_finalize_switch);
1427         }
1428
1429         return 0;
1430 }
1431
1432 static int tb_start(struct tb *tb)
1433 {
1434         struct tb_cm *tcm = tb_priv(tb);
1435         int ret;
1436
1437         tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0);
1438         if (IS_ERR(tb->root_switch))
1439                 return PTR_ERR(tb->root_switch);
1440
1441         /*
1442          * ICM firmware upgrade needs running firmware and in native
1443          * mode that is not available so disable firmware upgrade of the
1444          * root switch.
1445          *
1446          * However, USB4 routers support NVM firmware upgrade if they
1447          * implement the necessary router operations.
1448          */
1449         tb->root_switch->no_nvm_upgrade = !tb_switch_is_usb4(tb->root_switch);
1450         /* All USB4 routers support runtime PM */
1451         tb->root_switch->rpm = tb_switch_is_usb4(tb->root_switch);
1452
1453         ret = tb_switch_configure(tb->root_switch);
1454         if (ret) {
1455                 tb_switch_put(tb->root_switch);
1456                 return ret;
1457         }
1458
1459         /* Announce the switch to the world */
1460         ret = tb_switch_add(tb->root_switch);
1461         if (ret) {
1462                 tb_switch_put(tb->root_switch);
1463                 return ret;
1464         }
1465
1466         /*
1467          * To support highest CLx state, we set host router's TMU to
1468          * Normal mode.
1469          */
1470         tb_switch_tmu_configure(tb->root_switch, TB_SWITCH_TMU_RATE_NORMAL,
1471                                 false);
1472         /* Enable TMU if it is off */
1473         tb_switch_tmu_enable(tb->root_switch);
1474         /* Full scan to discover devices added before the driver was loaded. */
1475         tb_scan_switch(tb->root_switch);
1476         /* Find out tunnels created by the boot firmware */
1477         tb_discover_tunnels(tb);
1478         /* Add DP resources from the DP tunnels created by the boot firmware */
1479         tb_discover_dp_resources(tb);
1480         /*
1481          * If the boot firmware did not create USB 3.x tunnels create them
1482          * now for the whole topology.
1483          */
1484         tb_create_usb3_tunnels(tb->root_switch);
1485         /* Add DP IN resources for the root switch */
1486         tb_add_dp_resources(tb->root_switch);
1487         /* Make the discovered switches available to the userspace */
1488         device_for_each_child(&tb->root_switch->dev, NULL,
1489                               tb_scan_finalize_switch);
1490
1491         /* Allow tb_handle_hotplug to progress events */
1492         tcm->hotplug_active = true;
1493         return 0;
1494 }
1495
1496 static int tb_suspend_noirq(struct tb *tb)
1497 {
1498         struct tb_cm *tcm = tb_priv(tb);
1499
1500         tb_dbg(tb, "suspending...\n");
1501         tb_disconnect_and_release_dp(tb);
1502         tb_switch_suspend(tb->root_switch, false);
1503         tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */
1504         tb_dbg(tb, "suspend finished\n");
1505
1506         return 0;
1507 }
1508
1509 static void tb_restore_children(struct tb_switch *sw)
1510 {
1511         struct tb_port *port;
1512         int ret;
1513
1514         /* No need to restore if the router is already unplugged */
1515         if (sw->is_unplugged)
1516                 return;
1517
1518         /*
1519          * CL0s and CL1 are enabled and supported together.
1520          * Silently ignore CLx re-enabling in case CLx is not supported.
1521          */
1522         ret = tb_switch_enable_clx(sw, TB_CL1);
1523         if (ret && ret != -EOPNOTSUPP)
1524                 tb_sw_warn(sw, "failed to re-enable %s on upstream port\n",
1525                            tb_switch_clx_name(TB_CL1));
1526
1527         if (tb_switch_is_clx_enabled(sw, TB_CL1))
1528                 /*
1529                  * To support highest CLx state, we set router's TMU to
1530                  * Normal-Uni mode.
1531                  */
1532                 tb_switch_tmu_configure(sw, TB_SWITCH_TMU_RATE_NORMAL, true);
1533         else
1534                 /* If CLx disabled, configure router's TMU to HiFi-Bidir mode*/
1535                 tb_switch_tmu_configure(sw, TB_SWITCH_TMU_RATE_HIFI, false);
1536
1537         if (tb_enable_tmu(sw))
1538                 tb_sw_warn(sw, "failed to restore TMU configuration\n");
1539
1540         tb_switch_for_each_port(sw, port) {
1541                 if (!tb_port_has_remote(port) && !port->xdomain)
1542                         continue;
1543
1544                 if (port->remote) {
1545                         tb_switch_lane_bonding_enable(port->remote->sw);
1546                         tb_switch_configure_link(port->remote->sw);
1547
1548                         tb_restore_children(port->remote->sw);
1549                 } else if (port->xdomain) {
1550                         tb_port_configure_xdomain(port, port->xdomain);
1551                 }
1552         }
1553 }
1554
1555 static int tb_resume_noirq(struct tb *tb)
1556 {
1557         struct tb_cm *tcm = tb_priv(tb);
1558         struct tb_tunnel *tunnel, *n;
1559         unsigned int usb3_delay = 0;
1560         LIST_HEAD(tunnels);
1561
1562         tb_dbg(tb, "resuming...\n");
1563
1564         /* remove any pci devices the firmware might have setup */
1565         tb_switch_reset(tb->root_switch);
1566
1567         tb_switch_resume(tb->root_switch);
1568         tb_free_invalid_tunnels(tb);
1569         tb_free_unplugged_children(tb->root_switch);
1570         tb_restore_children(tb->root_switch);
1571
1572         /*
1573          * If we get here from suspend to disk the boot firmware or the
1574          * restore kernel might have created tunnels of its own. Since
1575          * we cannot be sure they are usable for us we find and tear
1576          * them down.
1577          */
1578         tb_switch_discover_tunnels(tb->root_switch, &tunnels, false);
1579         list_for_each_entry_safe_reverse(tunnel, n, &tunnels, list) {
1580                 if (tb_tunnel_is_usb3(tunnel))
1581                         usb3_delay = 500;
1582                 tb_tunnel_deactivate(tunnel);
1583                 tb_tunnel_free(tunnel);
1584         }
1585
1586         /* Re-create our tunnels now */
1587         list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {
1588                 /* USB3 requires delay before it can be re-activated */
1589                 if (tb_tunnel_is_usb3(tunnel)) {
1590                         msleep(usb3_delay);
1591                         /* Only need to do it once */
1592                         usb3_delay = 0;
1593                 }
1594                 tb_tunnel_restart(tunnel);
1595         }
1596         if (!list_empty(&tcm->tunnel_list)) {
1597                 /*
1598                  * the pcie links need some time to get going.
1599                  * 100ms works for me...
1600                  */
1601                 tb_dbg(tb, "tunnels restarted, sleeping for 100ms\n");
1602                 msleep(100);
1603         }
1604          /* Allow tb_handle_hotplug to progress events */
1605         tcm->hotplug_active = true;
1606         tb_dbg(tb, "resume finished\n");
1607
1608         return 0;
1609 }
1610
1611 static int tb_free_unplugged_xdomains(struct tb_switch *sw)
1612 {
1613         struct tb_port *port;
1614         int ret = 0;
1615
1616         tb_switch_for_each_port(sw, port) {
1617                 if (tb_is_upstream_port(port))
1618                         continue;
1619                 if (port->xdomain && port->xdomain->is_unplugged) {
1620                         tb_retimer_remove_all(port);
1621                         tb_xdomain_remove(port->xdomain);
1622                         tb_port_unconfigure_xdomain(port);
1623                         port->xdomain = NULL;
1624                         ret++;
1625                 } else if (port->remote) {
1626                         ret += tb_free_unplugged_xdomains(port->remote->sw);
1627                 }
1628         }
1629
1630         return ret;
1631 }
1632
1633 static int tb_freeze_noirq(struct tb *tb)
1634 {
1635         struct tb_cm *tcm = tb_priv(tb);
1636
1637         tcm->hotplug_active = false;
1638         return 0;
1639 }
1640
1641 static int tb_thaw_noirq(struct tb *tb)
1642 {
1643         struct tb_cm *tcm = tb_priv(tb);
1644
1645         tcm->hotplug_active = true;
1646         return 0;
1647 }
1648
1649 static void tb_complete(struct tb *tb)
1650 {
1651         /*
1652          * Release any unplugged XDomains and if there is a case where
1653          * another domain is swapped in place of unplugged XDomain we
1654          * need to run another rescan.
1655          */
1656         mutex_lock(&tb->lock);
1657         if (tb_free_unplugged_xdomains(tb->root_switch))
1658                 tb_scan_switch(tb->root_switch);
1659         mutex_unlock(&tb->lock);
1660 }
1661
1662 static int tb_runtime_suspend(struct tb *tb)
1663 {
1664         struct tb_cm *tcm = tb_priv(tb);
1665
1666         mutex_lock(&tb->lock);
1667         tb_switch_suspend(tb->root_switch, true);
1668         tcm->hotplug_active = false;
1669         mutex_unlock(&tb->lock);
1670
1671         return 0;
1672 }
1673
1674 static void tb_remove_work(struct work_struct *work)
1675 {
1676         struct tb_cm *tcm = container_of(work, struct tb_cm, remove_work.work);
1677         struct tb *tb = tcm_to_tb(tcm);
1678
1679         mutex_lock(&tb->lock);
1680         if (tb->root_switch) {
1681                 tb_free_unplugged_children(tb->root_switch);
1682                 tb_free_unplugged_xdomains(tb->root_switch);
1683         }
1684         mutex_unlock(&tb->lock);
1685 }
1686
1687 static int tb_runtime_resume(struct tb *tb)
1688 {
1689         struct tb_cm *tcm = tb_priv(tb);
1690         struct tb_tunnel *tunnel, *n;
1691
1692         mutex_lock(&tb->lock);
1693         tb_switch_resume(tb->root_switch);
1694         tb_free_invalid_tunnels(tb);
1695         tb_restore_children(tb->root_switch);
1696         list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list)
1697                 tb_tunnel_restart(tunnel);
1698         tcm->hotplug_active = true;
1699         mutex_unlock(&tb->lock);
1700
1701         /*
1702          * Schedule cleanup of any unplugged devices. Run this in a
1703          * separate thread to avoid possible deadlock if the device
1704          * removal runtime resumes the unplugged device.
1705          */
1706         queue_delayed_work(tb->wq, &tcm->remove_work, msecs_to_jiffies(50));
1707         return 0;
1708 }
1709
1710 static const struct tb_cm_ops tb_cm_ops = {
1711         .start = tb_start,
1712         .stop = tb_stop,
1713         .suspend_noirq = tb_suspend_noirq,
1714         .resume_noirq = tb_resume_noirq,
1715         .freeze_noirq = tb_freeze_noirq,
1716         .thaw_noirq = tb_thaw_noirq,
1717         .complete = tb_complete,
1718         .runtime_suspend = tb_runtime_suspend,
1719         .runtime_resume = tb_runtime_resume,
1720         .handle_event = tb_handle_event,
1721         .disapprove_switch = tb_disconnect_pci,
1722         .approve_switch = tb_tunnel_pci,
1723         .approve_xdomain_paths = tb_approve_xdomain_paths,
1724         .disconnect_xdomain_paths = tb_disconnect_xdomain_paths,
1725 };
1726
1727 /*
1728  * During suspend the Thunderbolt controller is reset and all PCIe
1729  * tunnels are lost. The NHI driver will try to reestablish all tunnels
1730  * during resume. This adds device links between the tunneled PCIe
1731  * downstream ports and the NHI so that the device core will make sure
1732  * NHI is resumed first before the rest.
1733  */
1734 static void tb_apple_add_links(struct tb_nhi *nhi)
1735 {
1736         struct pci_dev *upstream, *pdev;
1737
1738         if (!x86_apple_machine)
1739                 return;
1740
1741         switch (nhi->pdev->device) {
1742         case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1743         case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
1744         case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI:
1745         case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI:
1746                 break;
1747         default:
1748                 return;
1749         }
1750
1751         upstream = pci_upstream_bridge(nhi->pdev);
1752         while (upstream) {
1753                 if (!pci_is_pcie(upstream))
1754                         return;
1755                 if (pci_pcie_type(upstream) == PCI_EXP_TYPE_UPSTREAM)
1756                         break;
1757                 upstream = pci_upstream_bridge(upstream);
1758         }
1759
1760         if (!upstream)
1761                 return;
1762
1763         /*
1764          * For each hotplug downstream port, create add device link
1765          * back to NHI so that PCIe tunnels can be re-established after
1766          * sleep.
1767          */
1768         for_each_pci_bridge(pdev, upstream->subordinate) {
1769                 const struct device_link *link;
1770
1771                 if (!pci_is_pcie(pdev))
1772                         continue;
1773                 if (pci_pcie_type(pdev) != PCI_EXP_TYPE_DOWNSTREAM ||
1774                     !pdev->is_hotplug_bridge)
1775                         continue;
1776
1777                 link = device_link_add(&pdev->dev, &nhi->pdev->dev,
1778                                        DL_FLAG_AUTOREMOVE_SUPPLIER |
1779                                        DL_FLAG_PM_RUNTIME);
1780                 if (link) {
1781                         dev_dbg(&nhi->pdev->dev, "created link from %s\n",
1782                                 dev_name(&pdev->dev));
1783                 } else {
1784                         dev_warn(&nhi->pdev->dev, "device link creation from %s failed\n",
1785                                  dev_name(&pdev->dev));
1786                 }
1787         }
1788 }
1789
1790 struct tb *tb_probe(struct tb_nhi *nhi)
1791 {
1792         struct tb_cm *tcm;
1793         struct tb *tb;
1794
1795         tb = tb_domain_alloc(nhi, TB_TIMEOUT, sizeof(*tcm));
1796         if (!tb)
1797                 return NULL;
1798
1799         if (tb_acpi_may_tunnel_pcie())
1800                 tb->security_level = TB_SECURITY_USER;
1801         else
1802                 tb->security_level = TB_SECURITY_NOPCIE;
1803
1804         tb->cm_ops = &tb_cm_ops;
1805
1806         tcm = tb_priv(tb);
1807         INIT_LIST_HEAD(&tcm->tunnel_list);
1808         INIT_LIST_HEAD(&tcm->dp_resources);
1809         INIT_DELAYED_WORK(&tcm->remove_work, tb_remove_work);
1810
1811         tb_dbg(tb, "using software connection manager\n");
1812
1813         tb_apple_add_links(nhi);
1814         tb_acpi_add_links(nhi);
1815
1816         return tb;
1817 }