drivers/thunderbolt/switch.c

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This source file includes following definitions.
__nvm_get_auth_status
nvm_get_auth_status
nvm_set_auth_status
nvm_clear_auth_status
nvm_validate_and_write
nvm_authenticate_host
nvm_authenticate_device
tb_switch_nvm_read
tb_switch_nvm_no_read
tb_switch_nvm_write
register_nvmem
tb_switch_nvm_add
tb_switch_nvm_remove
tb_port_type
tb_dump_port
tb_port_state
tb_wait_for_port
tb_port_add_nfc_credits
tb_port_set_initial_credits
tb_port_clear_counter
tb_init_port
tb_port_alloc_hopid
tb_port_alloc_in_hopid
tb_port_alloc_out_hopid
tb_port_release_in_hopid
tb_port_release_out_hopid
tb_next_port_on_path
tb_port_is_enabled
tb_pci_port_is_enabled
tb_pci_port_enable
tb_dp_port_hpd_is_active
tb_dp_port_hpd_clear
tb_dp_port_set_hops
tb_dp_port_is_enabled
tb_dp_port_enable
tb_dump_switch
tb_switch_reset
tb_plug_events_active
authorized_show
tb_switch_set_authorized
authorized_store
boot_show
device_show
device_name_show
key_show
key_store
nvm_authenticate_start
nvm_authenticate_complete
nvm_authenticate_show
nvm_authenticate_store
nvm_version_show
vendor_show
vendor_name_show
unique_id_show
switch_attr_is_visible
tb_switch_release
tb_switch_runtime_suspend
tb_switch_runtime_resume
tb_switch_get_generation
tb_switch_alloc
tb_switch_alloc_safe_mode
tb_switch_configure
tb_switch_set_uuid
tb_switch_add_dma_port
tb_switch_add
tb_switch_remove
tb_sw_set_unplugged
tb_switch_resume
tb_switch_suspend
tb_switch_match
tb_switch_find_by_link_depth
tb_switch_find_by_uuid
tb_switch_find_by_route
tb_switch_exit
   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Thunderbolt driver - switch/port utility functions
   4  *
   5  * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
   6  * Copyright (C) 2018, Intel Corporation
   7  */
   8 
   9 #include <linux/delay.h>
  10 #include <linux/idr.h>
  11 #include <linux/nvmem-provider.h>
  12 #include <linux/pm_runtime.h>
  13 #include <linux/sched/signal.h>
  14 #include <linux/sizes.h>
  15 #include <linux/slab.h>
  16 #include <linux/vmalloc.h>
  17 
  18 #include "tb.h"
  19 
  20 /* Switch NVM support */
  21 
  22 #define NVM_DEVID               0x05
  23 #define NVM_VERSION             0x08
  24 #define NVM_CSS                 0x10
  25 #define NVM_FLASH_SIZE          0x45
  26 
  27 #define NVM_MIN_SIZE            SZ_32K
  28 #define NVM_MAX_SIZE            SZ_512K
  29 
  30 static DEFINE_IDA(nvm_ida);
  31 
  32 struct nvm_auth_status {
  33         struct list_head list;
  34         uuid_t uuid;
  35         u32 status;
  36 };
  37 
  38 /*
  39  * Hold NVM authentication failure status per switch This information
  40  * needs to stay around even when the switch gets power cycled so we
  41  * keep it separately.
  42  */
  43 static LIST_HEAD(nvm_auth_status_cache);
  44 static DEFINE_MUTEX(nvm_auth_status_lock);
  45 
  46 static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw)
  47 {
  48         struct nvm_auth_status *st;
  49 
  50         list_for_each_entry(st, &nvm_auth_status_cache, list) {
  51                 if (uuid_equal(&st->uuid, sw->uuid))
  52                         return st;
  53         }
  54 
  55         return NULL;
  56 }
  57 
  58 static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status)
  59 {
  60         struct nvm_auth_status *st;
  61 
  62         mutex_lock(&nvm_auth_status_lock);
  63         st = __nvm_get_auth_status(sw);
  64         mutex_unlock(&nvm_auth_status_lock);
  65 
  66         *status = st ? st->status : 0;
  67 }
  68 
  69 static void nvm_set_auth_status(const struct tb_switch *sw, u32 status)
  70 {
  71         struct nvm_auth_status *st;
  72 
  73         if (WARN_ON(!sw->uuid))
  74                 return;
  75 
  76         mutex_lock(&nvm_auth_status_lock);
  77         st = __nvm_get_auth_status(sw);
  78 
  79         if (!st) {
  80                 st = kzalloc(sizeof(*st), GFP_KERNEL);
  81                 if (!st)
  82                         goto unlock;
  83 
  84                 memcpy(&st->uuid, sw->uuid, sizeof(st->uuid));
  85                 INIT_LIST_HEAD(&st->list);
  86                 list_add_tail(&st->list, &nvm_auth_status_cache);
  87         }
  88 
  89         st->status = status;
  90 unlock:
  91         mutex_unlock(&nvm_auth_status_lock);
  92 }
  93 
  94 static void nvm_clear_auth_status(const struct tb_switch *sw)
  95 {
  96         struct nvm_auth_status *st;
  97 
  98         mutex_lock(&nvm_auth_status_lock);
  99         st = __nvm_get_auth_status(sw);
 100         if (st) {
 101                 list_del(&st->list);
 102                 kfree(st);
 103         }
 104         mutex_unlock(&nvm_auth_status_lock);
 105 }
 106 
 107 static int nvm_validate_and_write(struct tb_switch *sw)
 108 {
 109         unsigned int image_size, hdr_size;
 110         const u8 *buf = sw->nvm->buf;
 111         u16 ds_size;
 112         int ret;
 113 
 114         if (!buf)
 115                 return -EINVAL;
 116 
 117         image_size = sw->nvm->buf_data_size;
 118         if (image_size < NVM_MIN_SIZE || image_size > NVM_MAX_SIZE)
 119                 return -EINVAL;
 120 
 121         /*
 122          * FARB pointer must point inside the image and must at least
 123          * contain parts of the digital section we will be reading here.
 124          */
 125         hdr_size = (*(u32 *)buf) & 0xffffff;
 126         if (hdr_size + NVM_DEVID + 2 >= image_size)
 127                 return -EINVAL;
 128 
 129         /* Digital section start should be aligned to 4k page */
 130         if (!IS_ALIGNED(hdr_size, SZ_4K))
 131                 return -EINVAL;
 132 
 133         /*
 134          * Read digital section size and check that it also fits inside
 135          * the image.
 136          */
 137         ds_size = *(u16 *)(buf + hdr_size);
 138         if (ds_size >= image_size)
 139                 return -EINVAL;
 140 
 141         if (!sw->safe_mode) {
 142                 u16 device_id;
 143 
 144                 /*
 145                  * Make sure the device ID in the image matches the one
 146                  * we read from the switch config space.
 147                  */
 148                 device_id = *(u16 *)(buf + hdr_size + NVM_DEVID);
 149                 if (device_id != sw->config.device_id)
 150                         return -EINVAL;
 151 
 152                 if (sw->generation < 3) {
 153                         /* Write CSS headers first */
 154                         ret = dma_port_flash_write(sw->dma_port,
 155                                 DMA_PORT_CSS_ADDRESS, buf + NVM_CSS,
 156                                 DMA_PORT_CSS_MAX_SIZE);
 157                         if (ret)
 158                                 return ret;
 159                 }
 160 
 161                 /* Skip headers in the image */
 162                 buf += hdr_size;
 163                 image_size -= hdr_size;
 164         }
 165 
 166         return dma_port_flash_write(sw->dma_port, 0, buf, image_size);
 167 }
 168 
 169 static int nvm_authenticate_host(struct tb_switch *sw)
 170 {
 171         int ret = 0;
 172 
 173         /*
 174          * Root switch NVM upgrade requires that we disconnect the
 175          * existing paths first (in case it is not in safe mode
 176          * already).
 177          */
 178         if (!sw->safe_mode) {
 179                 u32 status;
 180 
 181                 ret = tb_domain_disconnect_all_paths(sw->tb);
 182                 if (ret)
 183                         return ret;
 184                 /*
 185                  * The host controller goes away pretty soon after this if
 186                  * everything goes well so getting timeout is expected.
 187                  */
 188                 ret = dma_port_flash_update_auth(sw->dma_port);
 189                 if (!ret || ret == -ETIMEDOUT)
 190                         return 0;
 191 
 192                 /*
 193                  * Any error from update auth operation requires power
 194                  * cycling of the host router.
 195                  */
 196                 tb_sw_warn(sw, "failed to authenticate NVM, power cycling\n");
 197                 if (dma_port_flash_update_auth_status(sw->dma_port, &status) > 0)
 198                         nvm_set_auth_status(sw, status);
 199         }
 200 
 201         /*
 202          * From safe mode we can get out by just power cycling the
 203          * switch.
 204          */
 205         dma_port_power_cycle(sw->dma_port);
 206         return ret;
 207 }
 208 
 209 static int nvm_authenticate_device(struct tb_switch *sw)
 210 {
 211         int ret, retries = 10;
 212 
 213         ret = dma_port_flash_update_auth(sw->dma_port);
 214         switch (ret) {
 215         case 0:
 216         case -ETIMEDOUT:
 217         case -EACCES:
 218         case -EINVAL:
 219                 /* Power cycle is required */
 220                 break;
 221         default:
 222                 return ret;
 223         }
 224 
 225         /*
 226          * Poll here for the authentication status. It takes some time
 227          * for the device to respond (we get timeout for a while). Once
 228          * we get response the device needs to be power cycled in order
 229          * to the new NVM to be taken into use.
 230          */
 231         do {
 232                 u32 status;
 233 
 234                 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
 235                 if (ret < 0 && ret != -ETIMEDOUT)
 236                         return ret;
 237                 if (ret > 0) {
 238                         if (status) {
 239                                 tb_sw_warn(sw, "failed to authenticate NVM\n");
 240                                 nvm_set_auth_status(sw, status);
 241                         }
 242 
 243                         tb_sw_info(sw, "power cycling the switch now\n");
 244                         dma_port_power_cycle(sw->dma_port);
 245                         return 0;
 246                 }
 247 
 248                 msleep(500);
 249         } while (--retries);
 250 
 251         return -ETIMEDOUT;
 252 }
 253 
 254 static int tb_switch_nvm_read(void *priv, unsigned int offset, void *val,
 255                               size_t bytes)
 256 {
 257         struct tb_switch *sw = priv;
 258         int ret;
 259 
 260         pm_runtime_get_sync(&sw->dev);
 261 
 262         if (!mutex_trylock(&sw->tb->lock)) {
 263                 ret = restart_syscall();
 264                 goto out;
 265         }
 266 
 267         ret = dma_port_flash_read(sw->dma_port, offset, val, bytes);
 268         mutex_unlock(&sw->tb->lock);
 269 
 270 out:
 271         pm_runtime_mark_last_busy(&sw->dev);
 272         pm_runtime_put_autosuspend(&sw->dev);
 273 
 274         return ret;
 275 }
 276 
 277 static int tb_switch_nvm_no_read(void *priv, unsigned int offset, void *val,
 278                                  size_t bytes)
 279 {
 280         return -EPERM;
 281 }
 282 
 283 static int tb_switch_nvm_write(void *priv, unsigned int offset, void *val,
 284                                size_t bytes)
 285 {
 286         struct tb_switch *sw = priv;
 287         int ret = 0;
 288 
 289         if (!mutex_trylock(&sw->tb->lock))
 290                 return restart_syscall();
 291 
 292         /*
 293          * Since writing the NVM image might require some special steps,
 294          * for example when CSS headers are written, we cache the image
 295          * locally here and handle the special cases when the user asks
 296          * us to authenticate the image.
 297          */
 298         if (!sw->nvm->buf) {
 299                 sw->nvm->buf = vmalloc(NVM_MAX_SIZE);
 300                 if (!sw->nvm->buf) {
 301                         ret = -ENOMEM;
 302                         goto unlock;
 303                 }
 304         }
 305 
 306         sw->nvm->buf_data_size = offset + bytes;
 307         memcpy(sw->nvm->buf + offset, val, bytes);
 308 
 309 unlock:
 310         mutex_unlock(&sw->tb->lock);
 311 
 312         return ret;
 313 }
 314 
 315 static struct nvmem_device *register_nvmem(struct tb_switch *sw, int id,
 316                                            size_t size, bool active)
 317 {
 318         struct nvmem_config config;
 319 
 320         memset(&config, 0, sizeof(config));
 321 
 322         if (active) {
 323                 config.name = "nvm_active";
 324                 config.reg_read = tb_switch_nvm_read;
 325                 config.read_only = true;
 326         } else {
 327                 config.name = "nvm_non_active";
 328                 config.reg_read = tb_switch_nvm_no_read;
 329                 config.reg_write = tb_switch_nvm_write;
 330                 config.root_only = true;
 331         }
 332 
 333         config.id = id;
 334         config.stride = 4;
 335         config.word_size = 4;
 336         config.size = size;
 337         config.dev = &sw->dev;
 338         config.owner = THIS_MODULE;
 339         config.priv = sw;
 340 
 341         return nvmem_register(&config);
 342 }
 343 
 344 static int tb_switch_nvm_add(struct tb_switch *sw)
 345 {
 346         struct nvmem_device *nvm_dev;
 347         struct tb_switch_nvm *nvm;
 348         u32 val;
 349         int ret;
 350 
 351         if (!sw->dma_port)
 352                 return 0;
 353 
 354         nvm = kzalloc(sizeof(*nvm), GFP_KERNEL);
 355         if (!nvm)
 356                 return -ENOMEM;
 357 
 358         nvm->id = ida_simple_get(&nvm_ida, 0, 0, GFP_KERNEL);
 359 
 360         /*
 361          * If the switch is in safe-mode the only accessible portion of
 362          * the NVM is the non-active one where userspace is expected to
 363          * write new functional NVM.
 364          */
 365         if (!sw->safe_mode) {
 366                 u32 nvm_size, hdr_size;
 367 
 368                 ret = dma_port_flash_read(sw->dma_port, NVM_FLASH_SIZE, &val,
 369                                           sizeof(val));
 370                 if (ret)
 371                         goto err_ida;
 372 
 373                 hdr_size = sw->generation < 3 ? SZ_8K : SZ_16K;
 374                 nvm_size = (SZ_1M << (val & 7)) / 8;
 375                 nvm_size = (nvm_size - hdr_size) / 2;
 376 
 377                 ret = dma_port_flash_read(sw->dma_port, NVM_VERSION, &val,
 378                                           sizeof(val));
 379                 if (ret)
 380                         goto err_ida;
 381 
 382                 nvm->major = val >> 16;
 383                 nvm->minor = val >> 8;
 384 
 385                 nvm_dev = register_nvmem(sw, nvm->id, nvm_size, true);
 386                 if (IS_ERR(nvm_dev)) {
 387                         ret = PTR_ERR(nvm_dev);
 388                         goto err_ida;
 389                 }
 390                 nvm->active = nvm_dev;
 391         }
 392 
 393         if (!sw->no_nvm_upgrade) {
 394                 nvm_dev = register_nvmem(sw, nvm->id, NVM_MAX_SIZE, false);
 395                 if (IS_ERR(nvm_dev)) {
 396                         ret = PTR_ERR(nvm_dev);
 397                         goto err_nvm_active;
 398                 }
 399                 nvm->non_active = nvm_dev;
 400         }
 401 
 402         sw->nvm = nvm;
 403         return 0;
 404 
 405 err_nvm_active:
 406         if (nvm->active)
 407                 nvmem_unregister(nvm->active);
 408 err_ida:
 409         ida_simple_remove(&nvm_ida, nvm->id);
 410         kfree(nvm);
 411 
 412         return ret;
 413 }
 414 
 415 static void tb_switch_nvm_remove(struct tb_switch *sw)
 416 {
 417         struct tb_switch_nvm *nvm;
 418 
 419         nvm = sw->nvm;
 420         sw->nvm = NULL;
 421 
 422         if (!nvm)
 423                 return;
 424 
 425         /* Remove authentication status in case the switch is unplugged */
 426         if (!nvm->authenticating)
 427                 nvm_clear_auth_status(sw);
 428 
 429         if (nvm->non_active)
 430                 nvmem_unregister(nvm->non_active);
 431         if (nvm->active)
 432                 nvmem_unregister(nvm->active);
 433         ida_simple_remove(&nvm_ida, nvm->id);
 434         vfree(nvm->buf);
 435         kfree(nvm);
 436 }
 437 
 438 /* port utility functions */
 439 
 440 static const char *tb_port_type(struct tb_regs_port_header *port)
 441 {
 442         switch (port->type >> 16) {
 443         case 0:
 444                 switch ((u8) port->type) {
 445                 case 0:
 446                         return "Inactive";
 447                 case 1:
 448                         return "Port";
 449                 case 2:
 450                         return "NHI";
 451                 default:
 452                         return "unknown";
 453                 }
 454         case 0x2:
 455                 return "Ethernet";
 456         case 0x8:
 457                 return "SATA";
 458         case 0xe:
 459                 return "DP/HDMI";
 460         case 0x10:
 461                 return "PCIe";
 462         case 0x20:
 463                 return "USB";
 464         default:
 465                 return "unknown";
 466         }
 467 }
 468 
 469 static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
 470 {
 471         tb_dbg(tb,
 472                " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
 473                port->port_number, port->vendor_id, port->device_id,
 474                port->revision, port->thunderbolt_version, tb_port_type(port),
 475                port->type);
 476         tb_dbg(tb, "  Max hop id (in/out): %d/%d\n",
 477                port->max_in_hop_id, port->max_out_hop_id);
 478         tb_dbg(tb, "  Max counters: %d\n", port->max_counters);
 479         tb_dbg(tb, "  NFC Credits: %#x\n", port->nfc_credits);
 480 }
 481 
 482 /**
 483  * tb_port_state() - get connectedness state of a port
 484  *
 485  * The port must have a TB_CAP_PHY (i.e. it should be a real port).
 486  *
 487  * Return: Returns an enum tb_port_state on success or an error code on failure.
 488  */
 489 static int tb_port_state(struct tb_port *port)
 490 {
 491         struct tb_cap_phy phy;
 492         int res;
 493         if (port->cap_phy == 0) {
 494                 tb_port_WARN(port, "does not have a PHY\n");
 495                 return -EINVAL;
 496         }
 497         res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
 498         if (res)
 499                 return res;
 500         return phy.state;
 501 }
 502 
 503 /**
 504  * tb_wait_for_port() - wait for a port to become ready
 505  *
 506  * Wait up to 1 second for a port to reach state TB_PORT_UP. If
 507  * wait_if_unplugged is set then we also wait if the port is in state
 508  * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
 509  * switch resume). Otherwise we only wait if a device is registered but the link
 510  * has not yet been established.
 511  *
 512  * Return: Returns an error code on failure. Returns 0 if the port is not
 513  * connected or failed to reach state TB_PORT_UP within one second. Returns 1
 514  * if the port is connected and in state TB_PORT_UP.
 515  */
 516 int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
 517 {
 518         int retries = 10;
 519         int state;
 520         if (!port->cap_phy) {
 521                 tb_port_WARN(port, "does not have PHY\n");
 522                 return -EINVAL;
 523         }
 524         if (tb_is_upstream_port(port)) {
 525                 tb_port_WARN(port, "is the upstream port\n");
 526                 return -EINVAL;
 527         }
 528 
 529         while (retries--) {
 530                 state = tb_port_state(port);
 531                 if (state < 0)
 532                         return state;
 533                 if (state == TB_PORT_DISABLED) {
 534                         tb_port_dbg(port, "is disabled (state: 0)\n");
 535                         return 0;
 536                 }
 537                 if (state == TB_PORT_UNPLUGGED) {
 538                         if (wait_if_unplugged) {
 539                                 /* used during resume */
 540                                 tb_port_dbg(port,
 541                                             "is unplugged (state: 7), retrying...\n");
 542                                 msleep(100);
 543                                 continue;
 544                         }
 545                         tb_port_dbg(port, "is unplugged (state: 7)\n");
 546                         return 0;
 547                 }
 548                 if (state == TB_PORT_UP) {
 549                         tb_port_dbg(port, "is connected, link is up (state: 2)\n");
 550                         return 1;
 551                 }
 552 
 553                 /*
 554                  * After plug-in the state is TB_PORT_CONNECTING. Give it some
 555                  * time.
 556                  */
 557                 tb_port_dbg(port,
 558                             "is connected, link is not up (state: %d), retrying...\n",
 559                             state);
 560                 msleep(100);
 561         }
 562         tb_port_warn(port,
 563                      "failed to reach state TB_PORT_UP. Ignoring port...\n");
 564         return 0;
 565 }
 566 
 567 /**
 568  * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
 569  *
 570  * Change the number of NFC credits allocated to @port by @credits. To remove
 571  * NFC credits pass a negative amount of credits.
 572  *
 573  * Return: Returns 0 on success or an error code on failure.
 574  */
 575 int tb_port_add_nfc_credits(struct tb_port *port, int credits)
 576 {
 577         u32 nfc_credits;
 578 
 579         if (credits == 0 || port->sw->is_unplugged)
 580                 return 0;
 581 
 582         nfc_credits = port->config.nfc_credits & TB_PORT_NFC_CREDITS_MASK;
 583         nfc_credits += credits;
 584 
 585         tb_port_dbg(port, "adding %d NFC credits to %lu",
 586                     credits, port->config.nfc_credits & TB_PORT_NFC_CREDITS_MASK);
 587 
 588         port->config.nfc_credits &= ~TB_PORT_NFC_CREDITS_MASK;
 589         port->config.nfc_credits |= nfc_credits;
 590 
 591         return tb_port_write(port, &port->config.nfc_credits,
 592                              TB_CFG_PORT, 4, 1);
 593 }
 594 
 595 /**
 596  * tb_port_set_initial_credits() - Set initial port link credits allocated
 597  * @port: Port to set the initial credits
 598  * @credits: Number of credits to to allocate
 599  *
 600  * Set initial credits value to be used for ingress shared buffering.
 601  */
 602 int tb_port_set_initial_credits(struct tb_port *port, u32 credits)
 603 {
 604         u32 data;
 605         int ret;
 606 
 607         ret = tb_port_read(port, &data, TB_CFG_PORT, 5, 1);
 608         if (ret)
 609                 return ret;
 610 
 611         data &= ~TB_PORT_LCA_MASK;
 612         data |= (credits << TB_PORT_LCA_SHIFT) & TB_PORT_LCA_MASK;
 613 
 614         return tb_port_write(port, &data, TB_CFG_PORT, 5, 1);
 615 }
 616 
 617 /**
 618  * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
 619  *
 620  * Return: Returns 0 on success or an error code on failure.
 621  */
 622 int tb_port_clear_counter(struct tb_port *port, int counter)
 623 {
 624         u32 zero[3] = { 0, 0, 0 };
 625         tb_port_dbg(port, "clearing counter %d\n", counter);
 626         return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
 627 }
 628 
 629 /**
 630  * tb_init_port() - initialize a port
 631  *
 632  * This is a helper method for tb_switch_alloc. Does not check or initialize
 633  * any downstream switches.
 634  *
 635  * Return: Returns 0 on success or an error code on failure.
 636  */
 637 static int tb_init_port(struct tb_port *port)
 638 {
 639         int res;
 640         int cap;
 641 
 642         res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
 643         if (res) {
 644                 if (res == -ENODEV) {
 645                         tb_dbg(port->sw->tb, " Port %d: not implemented\n",
 646                                port->port);
 647                         return 0;
 648                 }
 649                 return res;
 650         }
 651 
 652         /* Port 0 is the switch itself and has no PHY. */
 653         if (port->config.type == TB_TYPE_PORT && port->port != 0) {
 654                 cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
 655 
 656                 if (cap > 0)
 657                         port->cap_phy = cap;
 658                 else
 659                         tb_port_WARN(port, "non switch port without a PHY\n");
 660         } else if (port->port != 0) {
 661                 cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
 662                 if (cap > 0)
 663                         port->cap_adap = cap;
 664         }
 665 
 666         tb_dump_port(port->sw->tb, &port->config);
 667 
 668         /* Control port does not need HopID allocation */
 669         if (port->port) {
 670                 ida_init(&port->in_hopids);
 671                 ida_init(&port->out_hopids);
 672         }
 673 
 674         return 0;
 675 
 676 }
 677 
 678 static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,
 679                                int max_hopid)
 680 {
 681         int port_max_hopid;
 682         struct ida *ida;
 683 
 684         if (in) {
 685                 port_max_hopid = port->config.max_in_hop_id;
 686                 ida = &port->in_hopids;
 687         } else {
 688                 port_max_hopid = port->config.max_out_hop_id;
 689                 ida = &port->out_hopids;
 690         }
 691 
 692         /* HopIDs 0-7 are reserved */
 693         if (min_hopid < TB_PATH_MIN_HOPID)
 694                 min_hopid = TB_PATH_MIN_HOPID;
 695 
 696         if (max_hopid < 0 || max_hopid > port_max_hopid)
 697                 max_hopid = port_max_hopid;
 698 
 699         return ida_simple_get(ida, min_hopid, max_hopid + 1, GFP_KERNEL);
 700 }
 701 
 702 /**
 703  * tb_port_alloc_in_hopid() - Allocate input HopID from port
 704  * @port: Port to allocate HopID for
 705  * @min_hopid: Minimum acceptable input HopID
 706  * @max_hopid: Maximum acceptable input HopID
 707  *
 708  * Return: HopID between @min_hopid and @max_hopid or negative errno in
 709  * case of error.
 710  */
 711 int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)
 712 {
 713         return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);
 714 }
 715 
 716 /**
 717  * tb_port_alloc_out_hopid() - Allocate output HopID from port
 718  * @port: Port to allocate HopID for
 719  * @min_hopid: Minimum acceptable output HopID
 720  * @max_hopid: Maximum acceptable output HopID
 721  *
 722  * Return: HopID between @min_hopid and @max_hopid or negative errno in
 723  * case of error.
 724  */
 725 int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)
 726 {
 727         return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);
 728 }
 729 
 730 /**
 731  * tb_port_release_in_hopid() - Release allocated input HopID from port
 732  * @port: Port whose HopID to release
 733  * @hopid: HopID to release
 734  */
 735 void tb_port_release_in_hopid(struct tb_port *port, int hopid)
 736 {
 737         ida_simple_remove(&port->in_hopids, hopid);
 738 }
 739 
 740 /**
 741  * tb_port_release_out_hopid() - Release allocated output HopID from port
 742  * @port: Port whose HopID to release
 743  * @hopid: HopID to release
 744  */
 745 void tb_port_release_out_hopid(struct tb_port *port, int hopid)
 746 {
 747         ida_simple_remove(&port->out_hopids, hopid);
 748 }
 749 
 750 /**
 751  * tb_next_port_on_path() - Return next port for given port on a path
 752  * @start: Start port of the walk
 753  * @end: End port of the walk
 754  * @prev: Previous port (%NULL if this is the first)
 755  *
 756  * This function can be used to walk from one port to another if they
 757  * are connected through zero or more switches. If the @prev is dual
 758  * link port, the function follows that link and returns another end on
 759  * that same link.
 760  *
 761  * If the @end port has been reached, return %NULL.
 762  *
 763  * Domain tb->lock must be held when this function is called.
 764  */
 765 struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
 766                                      struct tb_port *prev)
 767 {
 768         struct tb_port *next;
 769 
 770         if (!prev)
 771                 return start;
 772 
 773         if (prev->sw == end->sw) {
 774                 if (prev == end)
 775                         return NULL;
 776                 return end;
 777         }
 778 
 779         if (start->sw->config.depth < end->sw->config.depth) {
 780                 if (prev->remote &&
 781                     prev->remote->sw->config.depth > prev->sw->config.depth)
 782                         next = prev->remote;
 783                 else
 784                         next = tb_port_at(tb_route(end->sw), prev->sw);
 785         } else {
 786                 if (tb_is_upstream_port(prev)) {
 787                         next = prev->remote;
 788                 } else {
 789                         next = tb_upstream_port(prev->sw);
 790                         /*
 791                          * Keep the same link if prev and next are both
 792                          * dual link ports.
 793                          */
 794                         if (next->dual_link_port &&
 795                             next->link_nr != prev->link_nr) {
 796                                 next = next->dual_link_port;
 797                         }
 798                 }
 799         }
 800 
 801         return next;
 802 }
 803 
 804 /**
 805  * tb_port_is_enabled() - Is the adapter port enabled
 806  * @port: Port to check
 807  */
 808 bool tb_port_is_enabled(struct tb_port *port)
 809 {
 810         switch (port->config.type) {
 811         case TB_TYPE_PCIE_UP:
 812         case TB_TYPE_PCIE_DOWN:
 813                 return tb_pci_port_is_enabled(port);
 814 
 815         case TB_TYPE_DP_HDMI_IN:
 816         case TB_TYPE_DP_HDMI_OUT:
 817                 return tb_dp_port_is_enabled(port);
 818 
 819         default:
 820                 return false;
 821         }
 822 }
 823 
 824 /**
 825  * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
 826  * @port: PCIe port to check
 827  */
 828 bool tb_pci_port_is_enabled(struct tb_port *port)
 829 {
 830         u32 data;
 831 
 832         if (tb_port_read(port, &data, TB_CFG_PORT, port->cap_adap, 1))
 833                 return false;
 834 
 835         return !!(data & TB_PCI_EN);
 836 }
 837 
 838 /**
 839  * tb_pci_port_enable() - Enable PCIe adapter port
 840  * @port: PCIe port to enable
 841  * @enable: Enable/disable the PCIe adapter
 842  */
 843 int tb_pci_port_enable(struct tb_port *port, bool enable)
 844 {
 845         u32 word = enable ? TB_PCI_EN : 0x0;
 846         if (!port->cap_adap)
 847                 return -ENXIO;
 848         return tb_port_write(port, &word, TB_CFG_PORT, port->cap_adap, 1);
 849 }
 850 
 851 /**
 852  * tb_dp_port_hpd_is_active() - Is HPD already active
 853  * @port: DP out port to check
 854  *
 855  * Checks if the DP OUT adapter port has HDP bit already set.
 856  */
 857 int tb_dp_port_hpd_is_active(struct tb_port *port)
 858 {
 859         u32 data;
 860         int ret;
 861 
 862         ret = tb_port_read(port, &data, TB_CFG_PORT, port->cap_adap + 2, 1);
 863         if (ret)
 864                 return ret;
 865 
 866         return !!(data & TB_DP_HDP);
 867 }
 868 
 869 /**
 870  * tb_dp_port_hpd_clear() - Clear HPD from DP IN port
 871  * @port: Port to clear HPD
 872  *
 873  * If the DP IN port has HDP set, this function can be used to clear it.
 874  */
 875 int tb_dp_port_hpd_clear(struct tb_port *port)
 876 {
 877         u32 data;
 878         int ret;
 879 
 880         ret = tb_port_read(port, &data, TB_CFG_PORT, port->cap_adap + 3, 1);
 881         if (ret)
 882                 return ret;
 883 
 884         data |= TB_DP_HPDC;
 885         return tb_port_write(port, &data, TB_CFG_PORT, port->cap_adap + 3, 1);
 886 }
 887 
 888 /**
 889  * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
 890  * @port: DP IN/OUT port to set hops
 891  * @video: Video Hop ID
 892  * @aux_tx: AUX TX Hop ID
 893  * @aux_rx: AUX RX Hop ID
 894  *
 895  * Programs specified Hop IDs for DP IN/OUT port.
 896  */
 897 int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
 898                         unsigned int aux_tx, unsigned int aux_rx)
 899 {
 900         u32 data[2];
 901         int ret;
 902 
 903         ret = tb_port_read(port, data, TB_CFG_PORT, port->cap_adap,
 904                            ARRAY_SIZE(data));
 905         if (ret)
 906                 return ret;
 907 
 908         data[0] &= ~TB_DP_VIDEO_HOPID_MASK;
 909         data[1] &= ~(TB_DP_AUX_RX_HOPID_MASK | TB_DP_AUX_TX_HOPID_MASK);
 910 
 911         data[0] |= (video << TB_DP_VIDEO_HOPID_SHIFT) & TB_DP_VIDEO_HOPID_MASK;
 912         data[1] |= aux_tx & TB_DP_AUX_TX_HOPID_MASK;
 913         data[1] |= (aux_rx << TB_DP_AUX_RX_HOPID_SHIFT) & TB_DP_AUX_RX_HOPID_MASK;
 914 
 915         return tb_port_write(port, data, TB_CFG_PORT, port->cap_adap,
 916                              ARRAY_SIZE(data));
 917 }
 918 
 919 /**
 920  * tb_dp_port_is_enabled() - Is DP adapter port enabled
 921  * @port: DP adapter port to check
 922  */
 923 bool tb_dp_port_is_enabled(struct tb_port *port)
 924 {
 925         u32 data[2];
 926 
 927         if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap,
 928                          ARRAY_SIZE(data)))
 929                 return false;
 930 
 931         return !!(data[0] & (TB_DP_VIDEO_EN | TB_DP_AUX_EN));
 932 }
 933 
 934 /**
 935  * tb_dp_port_enable() - Enables/disables DP paths of a port
 936  * @port: DP IN/OUT port
 937  * @enable: Enable/disable DP path
 938  *
 939  * Once Hop IDs are programmed DP paths can be enabled or disabled by
 940  * calling this function.
 941  */
 942 int tb_dp_port_enable(struct tb_port *port, bool enable)
 943 {
 944         u32 data[2];
 945         int ret;
 946 
 947         ret = tb_port_read(port, data, TB_CFG_PORT, port->cap_adap,
 948                            ARRAY_SIZE(data));
 949         if (ret)
 950                 return ret;
 951 
 952         if (enable)
 953                 data[0] |= TB_DP_VIDEO_EN | TB_DP_AUX_EN;
 954         else
 955                 data[0] &= ~(TB_DP_VIDEO_EN | TB_DP_AUX_EN);
 956 
 957         return tb_port_write(port, data, TB_CFG_PORT, port->cap_adap,
 958                              ARRAY_SIZE(data));
 959 }
 960 
 961 /* switch utility functions */
 962 
 963 static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
 964 {
 965         tb_dbg(tb, " Switch: %x:%x (Revision: %d, TB Version: %d)\n",
 966                sw->vendor_id, sw->device_id, sw->revision,
 967                sw->thunderbolt_version);
 968         tb_dbg(tb, "  Max Port Number: %d\n", sw->max_port_number);
 969         tb_dbg(tb, "  Config:\n");
 970         tb_dbg(tb,
 971                 "   Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
 972                sw->upstream_port_number, sw->depth,
 973                (((u64) sw->route_hi) << 32) | sw->route_lo,
 974                sw->enabled, sw->plug_events_delay);
 975         tb_dbg(tb, "   unknown1: %#x unknown4: %#x\n",
 976                sw->__unknown1, sw->__unknown4);
 977 }
 978 
 979 /**
 980  * reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET
 981  *
 982  * Return: Returns 0 on success or an error code on failure.
 983  */
 984 int tb_switch_reset(struct tb *tb, u64 route)
 985 {
 986         struct tb_cfg_result res;
 987         struct tb_regs_switch_header header = {
 988                 header.route_hi = route >> 32,
 989                 header.route_lo = route,
 990                 header.enabled = true,
 991         };
 992         tb_dbg(tb, "resetting switch at %llx\n", route);
 993         res.err = tb_cfg_write(tb->ctl, ((u32 *) &header) + 2, route,
 994                         0, 2, 2, 2);
 995         if (res.err)
 996                 return res.err;
 997         res = tb_cfg_reset(tb->ctl, route, TB_CFG_DEFAULT_TIMEOUT);
 998         if (res.err > 0)
 999                 return -EIO;
1000         return res.err;
1001 }
1002 
1003 /**
1004  * tb_plug_events_active() - enable/disable plug events on a switch
1005  *
1006  * Also configures a sane plug_events_delay of 255ms.
1007  *
1008  * Return: Returns 0 on success or an error code on failure.
1009  */
1010 static int tb_plug_events_active(struct tb_switch *sw, bool active)
1011 {
1012         u32 data;
1013         int res;
1014 
1015         if (!sw->config.enabled)
1016                 return 0;
1017 
1018         sw->config.plug_events_delay = 0xff;
1019         res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
1020         if (res)
1021                 return res;
1022 
1023         res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
1024         if (res)
1025                 return res;
1026 
1027         if (active) {
1028                 data = data & 0xFFFFFF83;
1029                 switch (sw->config.device_id) {
1030                 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1031                 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1032                 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1033                         break;
1034                 default:
1035                         data |= 4;
1036                 }
1037         } else {
1038                 data = data | 0x7c;
1039         }
1040         return tb_sw_write(sw, &data, TB_CFG_SWITCH,
1041                            sw->cap_plug_events + 1, 1);
1042 }
1043 
1044 static ssize_t authorized_show(struct device *dev,
1045                                struct device_attribute *attr,
1046                                char *buf)
1047 {
1048         struct tb_switch *sw = tb_to_switch(dev);
1049 
1050         return sprintf(buf, "%u\n", sw->authorized);
1051 }
1052 
1053 static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
1054 {
1055         int ret = -EINVAL;
1056 
1057         if (!mutex_trylock(&sw->tb->lock))
1058                 return restart_syscall();
1059 
1060         if (sw->authorized)
1061                 goto unlock;
1062 
1063         switch (val) {
1064         /* Approve switch */
1065         case 1:
1066                 if (sw->key)
1067                         ret = tb_domain_approve_switch_key(sw->tb, sw);
1068                 else
1069                         ret = tb_domain_approve_switch(sw->tb, sw);
1070                 break;
1071 
1072         /* Challenge switch */
1073         case 2:
1074                 if (sw->key)
1075                         ret = tb_domain_challenge_switch_key(sw->tb, sw);
1076                 break;
1077 
1078         default:
1079                 break;
1080         }
1081 
1082         if (!ret) {
1083                 sw->authorized = val;
1084                 /* Notify status change to the userspace */
1085                 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
1086         }
1087 
1088 unlock:
1089         mutex_unlock(&sw->tb->lock);
1090         return ret;
1091 }
1092 
1093 static ssize_t authorized_store(struct device *dev,
1094                                 struct device_attribute *attr,
1095                                 const char *buf, size_t count)
1096 {
1097         struct tb_switch *sw = tb_to_switch(dev);
1098         unsigned int val;
1099         ssize_t ret;
1100 
1101         ret = kstrtouint(buf, 0, &val);
1102         if (ret)
1103                 return ret;
1104         if (val > 2)
1105                 return -EINVAL;
1106 
1107         pm_runtime_get_sync(&sw->dev);
1108         ret = tb_switch_set_authorized(sw, val);
1109         pm_runtime_mark_last_busy(&sw->dev);
1110         pm_runtime_put_autosuspend(&sw->dev);
1111 
1112         return ret ? ret : count;
1113 }
1114 static DEVICE_ATTR_RW(authorized);
1115 
1116 static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
1117                          char *buf)
1118 {
1119         struct tb_switch *sw = tb_to_switch(dev);
1120 
1121         return sprintf(buf, "%u\n", sw->boot);
1122 }
1123 static DEVICE_ATTR_RO(boot);
1124 
1125 static ssize_t device_show(struct device *dev, struct device_attribute *attr,
1126                            char *buf)
1127 {
1128         struct tb_switch *sw = tb_to_switch(dev);
1129 
1130         return sprintf(buf, "%#x\n", sw->device);
1131 }
1132 static DEVICE_ATTR_RO(device);
1133 
1134 static ssize_t
1135 device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1136 {
1137         struct tb_switch *sw = tb_to_switch(dev);
1138 
1139         return sprintf(buf, "%s\n", sw->device_name ? sw->device_name : "");
1140 }
1141 static DEVICE_ATTR_RO(device_name);
1142 
1143 static ssize_t key_show(struct device *dev, struct device_attribute *attr,
1144                         char *buf)
1145 {
1146         struct tb_switch *sw = tb_to_switch(dev);
1147         ssize_t ret;
1148 
1149         if (!mutex_trylock(&sw->tb->lock))
1150                 return restart_syscall();
1151 
1152         if (sw->key)
1153                 ret = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
1154         else
1155                 ret = sprintf(buf, "\n");
1156 
1157         mutex_unlock(&sw->tb->lock);
1158         return ret;
1159 }
1160 
1161 static ssize_t key_store(struct device *dev, struct device_attribute *attr,
1162                          const char *buf, size_t count)
1163 {
1164         struct tb_switch *sw = tb_to_switch(dev);
1165         u8 key[TB_SWITCH_KEY_SIZE];
1166         ssize_t ret = count;
1167         bool clear = false;
1168 
1169         if (!strcmp(buf, "\n"))
1170                 clear = true;
1171         else if (hex2bin(key, buf, sizeof(key)))
1172                 return -EINVAL;
1173 
1174         if (!mutex_trylock(&sw->tb->lock))
1175                 return restart_syscall();
1176 
1177         if (sw->authorized) {
1178                 ret = -EBUSY;
1179         } else {
1180                 kfree(sw->key);
1181                 if (clear) {
1182                         sw->key = NULL;
1183                 } else {
1184                         sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
1185                         if (!sw->key)
1186                                 ret = -ENOMEM;
1187                 }
1188         }
1189 
1190         mutex_unlock(&sw->tb->lock);
1191         return ret;
1192 }
1193 static DEVICE_ATTR(key, 0600, key_show, key_store);
1194 
1195 static void nvm_authenticate_start(struct tb_switch *sw)
1196 {
1197         struct pci_dev *root_port;
1198 
1199         /*
1200          * During host router NVM upgrade we should not allow root port to
1201          * go into D3cold because some root ports cannot trigger PME
1202          * itself. To be on the safe side keep the root port in D0 during
1203          * the whole upgrade process.
1204          */
1205         root_port = pci_find_pcie_root_port(sw->tb->nhi->pdev);
1206         if (root_port)
1207                 pm_runtime_get_noresume(&root_port->dev);
1208 }
1209 
1210 static void nvm_authenticate_complete(struct tb_switch *sw)
1211 {
1212         struct pci_dev *root_port;
1213 
1214         root_port = pci_find_pcie_root_port(sw->tb->nhi->pdev);
1215         if (root_port)
1216                 pm_runtime_put(&root_port->dev);
1217 }
1218 
1219 static ssize_t nvm_authenticate_show(struct device *dev,
1220         struct device_attribute *attr, char *buf)
1221 {
1222         struct tb_switch *sw = tb_to_switch(dev);
1223         u32 status;
1224 
1225         nvm_get_auth_status(sw, &status);
1226         return sprintf(buf, "%#x\n", status);
1227 }
1228 
1229 static ssize_t nvm_authenticate_store(struct device *dev,
1230         struct device_attribute *attr, const char *buf, size_t count)
1231 {
1232         struct tb_switch *sw = tb_to_switch(dev);
1233         bool val;
1234         int ret;
1235 
1236         pm_runtime_get_sync(&sw->dev);
1237 
1238         if (!mutex_trylock(&sw->tb->lock)) {
1239                 ret = restart_syscall();
1240                 goto exit_rpm;
1241         }
1242 
1243         /* If NVMem devices are not yet added */
1244         if (!sw->nvm) {
1245                 ret = -EAGAIN;
1246                 goto exit_unlock;
1247         }
1248 
1249         ret = kstrtobool(buf, &val);
1250         if (ret)
1251                 goto exit_unlock;
1252 
1253         /* Always clear the authentication status */
1254         nvm_clear_auth_status(sw);
1255 
1256         if (val) {
1257                 if (!sw->nvm->buf) {
1258                         ret = -EINVAL;
1259                         goto exit_unlock;
1260                 }
1261 
1262                 ret = nvm_validate_and_write(sw);
1263                 if (ret)
1264                         goto exit_unlock;
1265 
1266                 sw->nvm->authenticating = true;
1267 
1268                 if (!tb_route(sw)) {
1269                         /*
1270                          * Keep root port from suspending as long as the
1271                          * NVM upgrade process is running.
1272                          */
1273                         nvm_authenticate_start(sw);
1274                         ret = nvm_authenticate_host(sw);
1275                 } else {
1276                         ret = nvm_authenticate_device(sw);
1277                 }
1278         }
1279 
1280 exit_unlock:
1281         mutex_unlock(&sw->tb->lock);
1282 exit_rpm:
1283         pm_runtime_mark_last_busy(&sw->dev);
1284         pm_runtime_put_autosuspend(&sw->dev);
1285 
1286         if (ret)
1287                 return ret;
1288         return count;
1289 }
1290 static DEVICE_ATTR_RW(nvm_authenticate);
1291 
1292 static ssize_t nvm_version_show(struct device *dev,
1293                                 struct device_attribute *attr, char *buf)
1294 {
1295         struct tb_switch *sw = tb_to_switch(dev);
1296         int ret;
1297 
1298         if (!mutex_trylock(&sw->tb->lock))
1299                 return restart_syscall();
1300 
1301         if (sw->safe_mode)
1302                 ret = -ENODATA;
1303         else if (!sw->nvm)
1304                 ret = -EAGAIN;
1305         else
1306                 ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
1307 
1308         mutex_unlock(&sw->tb->lock);
1309 
1310         return ret;
1311 }
1312 static DEVICE_ATTR_RO(nvm_version);
1313 
1314 static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
1315                            char *buf)
1316 {
1317         struct tb_switch *sw = tb_to_switch(dev);
1318 
1319         return sprintf(buf, "%#x\n", sw->vendor);
1320 }
1321 static DEVICE_ATTR_RO(vendor);
1322 
1323 static ssize_t
1324 vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1325 {
1326         struct tb_switch *sw = tb_to_switch(dev);
1327 
1328         return sprintf(buf, "%s\n", sw->vendor_name ? sw->vendor_name : "");
1329 }
1330 static DEVICE_ATTR_RO(vendor_name);
1331 
1332 static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
1333                               char *buf)
1334 {
1335         struct tb_switch *sw = tb_to_switch(dev);
1336 
1337         return sprintf(buf, "%pUb\n", sw->uuid);
1338 }
1339 static DEVICE_ATTR_RO(unique_id);
1340 
1341 static struct attribute *switch_attrs[] = {
1342         &dev_attr_authorized.attr,
1343         &dev_attr_boot.attr,
1344         &dev_attr_device.attr,
1345         &dev_attr_device_name.attr,
1346         &dev_attr_key.attr,
1347         &dev_attr_nvm_authenticate.attr,
1348         &dev_attr_nvm_version.attr,
1349         &dev_attr_vendor.attr,
1350         &dev_attr_vendor_name.attr,
1351         &dev_attr_unique_id.attr,
1352         NULL,
1353 };
1354 
1355 static umode_t switch_attr_is_visible(struct kobject *kobj,
1356                                       struct attribute *attr, int n)
1357 {
1358         struct device *dev = container_of(kobj, struct device, kobj);
1359         struct tb_switch *sw = tb_to_switch(dev);
1360 
1361         if (attr == &dev_attr_device.attr) {
1362                 if (!sw->device)
1363                         return 0;
1364         } else if (attr == &dev_attr_device_name.attr) {
1365                 if (!sw->device_name)
1366                         return 0;
1367         } else if (attr == &dev_attr_vendor.attr)  {
1368                 if (!sw->vendor)
1369                         return 0;
1370         } else if (attr == &dev_attr_vendor_name.attr)  {
1371                 if (!sw->vendor_name)
1372                         return 0;
1373         } else if (attr == &dev_attr_key.attr) {
1374                 if (tb_route(sw) &&
1375                     sw->tb->security_level == TB_SECURITY_SECURE &&
1376                     sw->security_level == TB_SECURITY_SECURE)
1377                         return attr->mode;
1378                 return 0;
1379         } else if (attr == &dev_attr_nvm_authenticate.attr) {
1380                 if (sw->dma_port && !sw->no_nvm_upgrade)
1381                         return attr->mode;
1382                 return 0;
1383         } else if (attr == &dev_attr_nvm_version.attr) {
1384                 if (sw->dma_port)
1385                         return attr->mode;
1386                 return 0;
1387         } else if (attr == &dev_attr_boot.attr) {
1388                 if (tb_route(sw))
1389                         return attr->mode;
1390                 return 0;
1391         }
1392 
1393         return sw->safe_mode ? 0 : attr->mode;
1394 }
1395 
1396 static struct attribute_group switch_group = {
1397         .is_visible = switch_attr_is_visible,
1398         .attrs = switch_attrs,
1399 };
1400 
1401 static const struct attribute_group *switch_groups[] = {
1402         &switch_group,
1403         NULL,
1404 };
1405 
1406 static void tb_switch_release(struct device *dev)
1407 {
1408         struct tb_switch *sw = tb_to_switch(dev);
1409         int i;
1410 
1411         dma_port_free(sw->dma_port);
1412 
1413         for (i = 1; i <= sw->config.max_port_number; i++) {
1414                 if (!sw->ports[i].disabled) {
1415                         ida_destroy(&sw->ports[i].in_hopids);
1416                         ida_destroy(&sw->ports[i].out_hopids);
1417                 }
1418         }
1419 
1420         kfree(sw->uuid);
1421         kfree(sw->device_name);
1422         kfree(sw->vendor_name);
1423         kfree(sw->ports);
1424         kfree(sw->drom);
1425         kfree(sw->key);
1426         kfree(sw);
1427 }
1428 
1429 /*
1430  * Currently only need to provide the callbacks. Everything else is handled
1431  * in the connection manager.
1432  */
1433 static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
1434 {
1435         struct tb_switch *sw = tb_to_switch(dev);
1436         const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
1437 
1438         if (cm_ops->runtime_suspend_switch)
1439                 return cm_ops->runtime_suspend_switch(sw);
1440 
1441         return 0;
1442 }
1443 
1444 static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
1445 {
1446         struct tb_switch *sw = tb_to_switch(dev);
1447         const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
1448 
1449         if (cm_ops->runtime_resume_switch)
1450                 return cm_ops->runtime_resume_switch(sw);
1451         return 0;
1452 }
1453 
1454 static const struct dev_pm_ops tb_switch_pm_ops = {
1455         SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
1456                            NULL)
1457 };
1458 
1459 struct device_type tb_switch_type = {
1460         .name = "thunderbolt_device",
1461         .release = tb_switch_release,
1462         .pm = &tb_switch_pm_ops,
1463 };
1464 
1465 static int tb_switch_get_generation(struct tb_switch *sw)
1466 {
1467         switch (sw->config.device_id) {
1468         case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1469         case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1470         case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
1471         case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
1472         case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
1473         case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1474         case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
1475         case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
1476                 return 1;
1477 
1478         case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
1479         case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
1480         case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
1481                 return 2;
1482 
1483         case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
1484         case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
1485         case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
1486         case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
1487         case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
1488         case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
1489         case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
1490         case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
1491         case PCI_DEVICE_ID_INTEL_ICL_NHI0:
1492         case PCI_DEVICE_ID_INTEL_ICL_NHI1:
1493                 return 3;
1494 
1495         default:
1496                 /*
1497                  * For unknown switches assume generation to be 1 to be
1498                  * on the safe side.
1499                  */
1500                 tb_sw_warn(sw, "unsupported switch device id %#x\n",
1501                            sw->config.device_id);
1502                 return 1;
1503         }
1504 }
1505 
1506 /**
1507  * tb_switch_alloc() - allocate a switch
1508  * @tb: Pointer to the owning domain
1509  * @parent: Parent device for this switch
1510  * @route: Route string for this switch
1511  *
1512  * Allocates and initializes a switch. Will not upload configuration to
1513  * the switch. For that you need to call tb_switch_configure()
1514  * separately. The returned switch should be released by calling
1515  * tb_switch_put().
1516  *
1517  * Return: Pointer to the allocated switch or ERR_PTR() in case of
1518  * failure.
1519  */
1520 struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
1521                                   u64 route)
1522 {
1523         struct tb_switch *sw;
1524         int upstream_port;
1525         int i, ret, depth;
1526 
1527         /* Make sure we do not exceed maximum topology limit */
1528         depth = tb_route_length(route);
1529         if (depth > TB_SWITCH_MAX_DEPTH)
1530                 return ERR_PTR(-EADDRNOTAVAIL);
1531 
1532         upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
1533         if (upstream_port < 0)
1534                 return ERR_PTR(upstream_port);
1535 
1536         sw = kzalloc(sizeof(*sw), GFP_KERNEL);
1537         if (!sw)
1538                 return ERR_PTR(-ENOMEM);
1539 
1540         sw->tb = tb;
1541         ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);
1542         if (ret)
1543                 goto err_free_sw_ports;
1544 
1545         tb_dbg(tb, "current switch config:\n");
1546         tb_dump_switch(tb, &sw->config);
1547 
1548         /* configure switch */
1549         sw->config.upstream_port_number = upstream_port;
1550         sw->config.depth = depth;
1551         sw->config.route_hi = upper_32_bits(route);
1552         sw->config.route_lo = lower_32_bits(route);
1553         sw->config.enabled = 0;
1554 
1555         /* initialize ports */
1556         sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
1557                                 GFP_KERNEL);
1558         if (!sw->ports) {
1559                 ret = -ENOMEM;
1560                 goto err_free_sw_ports;
1561         }
1562 
1563         for (i = 0; i <= sw->config.max_port_number; i++) {
1564                 /* minimum setup for tb_find_cap and tb_drom_read to work */
1565                 sw->ports[i].sw = sw;
1566                 sw->ports[i].port = i;
1567         }
1568 
1569         sw->generation = tb_switch_get_generation(sw);
1570 
1571         ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
1572         if (ret < 0) {
1573                 tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
1574                 goto err_free_sw_ports;
1575         }
1576         sw->cap_plug_events = ret;
1577 
1578         ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
1579         if (ret > 0)
1580                 sw->cap_lc = ret;
1581 
1582         /* Root switch is always authorized */
1583         if (!route)
1584                 sw->authorized = true;
1585 
1586         device_initialize(&sw->dev);
1587         sw->dev.parent = parent;
1588         sw->dev.bus = &tb_bus_type;
1589         sw->dev.type = &tb_switch_type;
1590         sw->dev.groups = switch_groups;
1591         dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
1592 
1593         return sw;
1594 
1595 err_free_sw_ports:
1596         kfree(sw->ports);
1597         kfree(sw);
1598 
1599         return ERR_PTR(ret);
1600 }
1601 
1602 /**
1603  * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
1604  * @tb: Pointer to the owning domain
1605  * @parent: Parent device for this switch
1606  * @route: Route string for this switch
1607  *
1608  * This creates a switch in safe mode. This means the switch pretty much
1609  * lacks all capabilities except DMA configuration port before it is
1610  * flashed with a valid NVM firmware.
1611  *
1612  * The returned switch must be released by calling tb_switch_put().
1613  *
1614  * Return: Pointer to the allocated switch or ERR_PTR() in case of failure
1615  */
1616 struct tb_switch *
1617 tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
1618 {
1619         struct tb_switch *sw;
1620 
1621         sw = kzalloc(sizeof(*sw), GFP_KERNEL);
1622         if (!sw)
1623                 return ERR_PTR(-ENOMEM);
1624 
1625         sw->tb = tb;
1626         sw->config.depth = tb_route_length(route);
1627         sw->config.route_hi = upper_32_bits(route);
1628         sw->config.route_lo = lower_32_bits(route);
1629         sw->safe_mode = true;
1630 
1631         device_initialize(&sw->dev);
1632         sw->dev.parent = parent;
1633         sw->dev.bus = &tb_bus_type;
1634         sw->dev.type = &tb_switch_type;
1635         sw->dev.groups = switch_groups;
1636         dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
1637 
1638         return sw;
1639 }
1640 
1641 /**
1642  * tb_switch_configure() - Uploads configuration to the switch
1643  * @sw: Switch to configure
1644  *
1645  * Call this function before the switch is added to the system. It will
1646  * upload configuration to the switch and makes it available for the
1647  * connection manager to use.
1648  *
1649  * Return: %0 in case of success and negative errno in case of failure
1650  */
1651 int tb_switch_configure(struct tb_switch *sw)
1652 {
1653         struct tb *tb = sw->tb;
1654         u64 route;
1655         int ret;
1656 
1657         route = tb_route(sw);
1658         tb_dbg(tb, "initializing Switch at %#llx (depth: %d, up port: %d)\n",
1659                route, tb_route_length(route), sw->config.upstream_port_number);
1660 
1661         if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
1662                 tb_sw_warn(sw, "unknown switch vendor id %#x\n",
1663                            sw->config.vendor_id);
1664 
1665         sw->config.enabled = 1;
1666 
1667         /* upload configuration */
1668         ret = tb_sw_write(sw, 1 + (u32 *)&sw->config, TB_CFG_SWITCH, 1, 3);
1669         if (ret)
1670                 return ret;
1671 
1672         ret = tb_lc_configure_link(sw);
1673         if (ret)
1674                 return ret;
1675 
1676         return tb_plug_events_active(sw, true);
1677 }
1678 
1679 static int tb_switch_set_uuid(struct tb_switch *sw)
1680 {
1681         u32 uuid[4];
1682         int ret;
1683 
1684         if (sw->uuid)
1685                 return 0;
1686 
1687         /*
1688          * The newer controllers include fused UUID as part of link
1689          * controller specific registers
1690          */
1691         ret = tb_lc_read_uuid(sw, uuid);
1692         if (ret) {
1693                 /*
1694                  * ICM generates UUID based on UID and fills the upper
1695                  * two words with ones. This is not strictly following
1696                  * UUID format but we want to be compatible with it so
1697                  * we do the same here.
1698                  */
1699                 uuid[0] = sw->uid & 0xffffffff;
1700                 uuid[1] = (sw->uid >> 32) & 0xffffffff;
1701                 uuid[2] = 0xffffffff;
1702                 uuid[3] = 0xffffffff;
1703         }
1704 
1705         sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
1706         if (!sw->uuid)
1707                 return -ENOMEM;
1708         return 0;
1709 }
1710 
1711 static int tb_switch_add_dma_port(struct tb_switch *sw)
1712 {
1713         u32 status;
1714         int ret;
1715 
1716         switch (sw->generation) {
1717         case 2:
1718                 /* Only root switch can be upgraded */
1719                 if (tb_route(sw))
1720                         return 0;
1721 
1722                 /* fallthrough */
1723         case 3:
1724                 ret = tb_switch_set_uuid(sw);
1725                 if (ret)
1726                         return ret;
1727                 break;
1728 
1729         default:
1730                 /*
1731                  * DMA port is the only thing available when the switch
1732                  * is in safe mode.
1733                  */
1734                 if (!sw->safe_mode)
1735                         return 0;
1736                 break;
1737         }
1738 
1739         /* Root switch DMA port requires running firmware */
1740         if (!tb_route(sw) && sw->config.enabled)
1741                 return 0;
1742 
1743         sw->dma_port = dma_port_alloc(sw);
1744         if (!sw->dma_port)
1745                 return 0;
1746 
1747         if (sw->no_nvm_upgrade)
1748                 return 0;
1749 
1750         /*
1751          * If there is status already set then authentication failed
1752          * when the dma_port_flash_update_auth() returned. Power cycling
1753          * is not needed (it was done already) so only thing we do here
1754          * is to unblock runtime PM of the root port.
1755          */
1756         nvm_get_auth_status(sw, &status);
1757         if (status) {
1758                 if (!tb_route(sw))
1759                         nvm_authenticate_complete(sw);
1760                 return 0;
1761         }
1762 
1763         /*
1764          * Check status of the previous flash authentication. If there
1765          * is one we need to power cycle the switch in any case to make
1766          * it functional again.
1767          */
1768         ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
1769         if (ret <= 0)
1770                 return ret;
1771 
1772         /* Now we can allow root port to suspend again */
1773         if (!tb_route(sw))
1774                 nvm_authenticate_complete(sw);
1775 
1776         if (status) {
1777                 tb_sw_info(sw, "switch flash authentication failed\n");
1778                 nvm_set_auth_status(sw, status);
1779         }
1780 
1781         tb_sw_info(sw, "power cycling the switch now\n");
1782         dma_port_power_cycle(sw->dma_port);
1783 
1784         /*
1785          * We return error here which causes the switch adding failure.
1786          * It should appear back after power cycle is complete.
1787          */
1788         return -ESHUTDOWN;
1789 }
1790 
1791 /**
1792  * tb_switch_add() - Add a switch to the domain
1793  * @sw: Switch to add
1794  *
1795  * This is the last step in adding switch to the domain. It will read
1796  * identification information from DROM and initializes ports so that
1797  * they can be used to connect other switches. The switch will be
1798  * exposed to the userspace when this function successfully returns. To
1799  * remove and release the switch, call tb_switch_remove().
1800  *
1801  * Return: %0 in case of success and negative errno in case of failure
1802  */
1803 int tb_switch_add(struct tb_switch *sw)
1804 {
1805         int i, ret;
1806 
1807         /*
1808          * Initialize DMA control port now before we read DROM. Recent
1809          * host controllers have more complete DROM on NVM that includes
1810          * vendor and model identification strings which we then expose
1811          * to the userspace. NVM can be accessed through DMA
1812          * configuration based mailbox.
1813          */
1814         ret = tb_switch_add_dma_port(sw);
1815         if (ret)
1816                 return ret;
1817 
1818         if (!sw->safe_mode) {
1819                 /* read drom */
1820                 ret = tb_drom_read(sw);
1821                 if (ret) {
1822                         tb_sw_warn(sw, "tb_eeprom_read_rom failed\n");
1823                         return ret;
1824                 }
1825                 tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
1826 
1827                 ret = tb_switch_set_uuid(sw);
1828                 if (ret)
1829                         return ret;
1830 
1831                 for (i = 0; i <= sw->config.max_port_number; i++) {
1832                         if (sw->ports[i].disabled) {
1833                                 tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
1834                                 continue;
1835                         }
1836                         ret = tb_init_port(&sw->ports[i]);
1837                         if (ret)
1838                                 return ret;
1839                 }
1840         }
1841 
1842         ret = device_add(&sw->dev);
1843         if (ret)
1844                 return ret;
1845 
1846         if (tb_route(sw)) {
1847                 dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
1848                          sw->vendor, sw->device);
1849                 if (sw->vendor_name && sw->device_name)
1850                         dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
1851                                  sw->device_name);
1852         }
1853 
1854         ret = tb_switch_nvm_add(sw);
1855         if (ret) {
1856                 device_del(&sw->dev);
1857                 return ret;
1858         }
1859 
1860         pm_runtime_set_active(&sw->dev);
1861         if (sw->rpm) {
1862                 pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
1863                 pm_runtime_use_autosuspend(&sw->dev);
1864                 pm_runtime_mark_last_busy(&sw->dev);
1865                 pm_runtime_enable(&sw->dev);
1866                 pm_request_autosuspend(&sw->dev);
1867         }
1868 
1869         return 0;
1870 }
1871 
1872 /**
1873  * tb_switch_remove() - Remove and release a switch
1874  * @sw: Switch to remove
1875  *
1876  * This will remove the switch from the domain and release it after last
1877  * reference count drops to zero. If there are switches connected below
1878  * this switch, they will be removed as well.
1879  */
1880 void tb_switch_remove(struct tb_switch *sw)
1881 {
1882         int i;
1883 
1884         if (sw->rpm) {
1885                 pm_runtime_get_sync(&sw->dev);
1886                 pm_runtime_disable(&sw->dev);
1887         }
1888 
1889         /* port 0 is the switch itself and never has a remote */
1890         for (i = 1; i <= sw->config.max_port_number; i++) {
1891                 if (tb_port_has_remote(&sw->ports[i])) {
1892                         tb_switch_remove(sw->ports[i].remote->sw);
1893                         sw->ports[i].remote = NULL;
1894                 } else if (sw->ports[i].xdomain) {
1895                         tb_xdomain_remove(sw->ports[i].xdomain);
1896                         sw->ports[i].xdomain = NULL;
1897                 }
1898         }
1899 
1900         if (!sw->is_unplugged)
1901                 tb_plug_events_active(sw, false);
1902         tb_lc_unconfigure_link(sw);
1903 
1904         tb_switch_nvm_remove(sw);
1905 
1906         if (tb_route(sw))
1907                 dev_info(&sw->dev, "device disconnected\n");
1908         device_unregister(&sw->dev);
1909 }
1910 
1911 /**
1912  * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
1913  */
1914 void tb_sw_set_unplugged(struct tb_switch *sw)
1915 {
1916         int i;
1917         if (sw == sw->tb->root_switch) {
1918                 tb_sw_WARN(sw, "cannot unplug root switch\n");
1919                 return;
1920         }
1921         if (sw->is_unplugged) {
1922                 tb_sw_WARN(sw, "is_unplugged already set\n");
1923                 return;
1924         }
1925         sw->is_unplugged = true;
1926         for (i = 0; i <= sw->config.max_port_number; i++) {
1927                 if (tb_port_has_remote(&sw->ports[i]))
1928                         tb_sw_set_unplugged(sw->ports[i].remote->sw);
1929                 else if (sw->ports[i].xdomain)
1930                         sw->ports[i].xdomain->is_unplugged = true;
1931         }
1932 }
1933 
1934 int tb_switch_resume(struct tb_switch *sw)
1935 {
1936         int i, err;
1937         tb_sw_dbg(sw, "resuming switch\n");
1938 
1939         /*
1940          * Check for UID of the connected switches except for root
1941          * switch which we assume cannot be removed.
1942          */
1943         if (tb_route(sw)) {
1944                 u64 uid;
1945 
1946                 /*
1947                  * Check first that we can still read the switch config
1948                  * space. It may be that there is now another domain
1949                  * connected.
1950                  */
1951                 err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
1952                 if (err < 0) {
1953                         tb_sw_info(sw, "switch not present anymore\n");
1954                         return err;
1955                 }
1956 
1957                 err = tb_drom_read_uid_only(sw, &uid);
1958                 if (err) {
1959                         tb_sw_warn(sw, "uid read failed\n");
1960                         return err;
1961                 }
1962                 if (sw->uid != uid) {
1963                         tb_sw_info(sw,
1964                                 "changed while suspended (uid %#llx -> %#llx)\n",
1965                                 sw->uid, uid);
1966                         return -ENODEV;
1967                 }
1968         }
1969 
1970         /* upload configuration */
1971         err = tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3);
1972         if (err)
1973                 return err;
1974 
1975         err = tb_lc_configure_link(sw);
1976         if (err)
1977                 return err;
1978 
1979         err = tb_plug_events_active(sw, true);
1980         if (err)
1981                 return err;
1982 
1983         /* check for surviving downstream switches */
1984         for (i = 1; i <= sw->config.max_port_number; i++) {
1985                 struct tb_port *port = &sw->ports[i];
1986 
1987                 if (!tb_port_has_remote(port) && !port->xdomain)
1988                         continue;
1989 
1990                 if (tb_wait_for_port(port, true) <= 0) {
1991                         tb_port_warn(port,
1992                                      "lost during suspend, disconnecting\n");
1993                         if (tb_port_has_remote(port))
1994                                 tb_sw_set_unplugged(port->remote->sw);
1995                         else if (port->xdomain)
1996                                 port->xdomain->is_unplugged = true;
1997                 } else if (tb_port_has_remote(port)) {
1998                         if (tb_switch_resume(port->remote->sw)) {
1999                                 tb_port_warn(port,
2000                                              "lost during suspend, disconnecting\n");
2001                                 tb_sw_set_unplugged(port->remote->sw);
2002                         }
2003                 }
2004         }
2005         return 0;
2006 }
2007 
2008 void tb_switch_suspend(struct tb_switch *sw)
2009 {
2010         int i, err;
2011         err = tb_plug_events_active(sw, false);
2012         if (err)
2013                 return;
2014 
2015         for (i = 1; i <= sw->config.max_port_number; i++) {
2016                 if (tb_port_has_remote(&sw->ports[i]))
2017                         tb_switch_suspend(sw->ports[i].remote->sw);
2018         }
2019 
2020         tb_lc_set_sleep(sw);
2021 }
2022 
2023 struct tb_sw_lookup {
2024         struct tb *tb;
2025         u8 link;
2026         u8 depth;
2027         const uuid_t *uuid;
2028         u64 route;
2029 };
2030 
2031 static int tb_switch_match(struct device *dev, const void *data)
2032 {
2033         struct tb_switch *sw = tb_to_switch(dev);
2034         const struct tb_sw_lookup *lookup = data;
2035 
2036         if (!sw)
2037                 return 0;
2038         if (sw->tb != lookup->tb)
2039                 return 0;
2040 
2041         if (lookup->uuid)
2042                 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
2043 
2044         if (lookup->route) {
2045                 return sw->config.route_lo == lower_32_bits(lookup->route) &&
2046                        sw->config.route_hi == upper_32_bits(lookup->route);
2047         }
2048 
2049         /* Root switch is matched only by depth */
2050         if (!lookup->depth)
2051                 return !sw->depth;
2052 
2053         return sw->link == lookup->link && sw->depth == lookup->depth;
2054 }
2055 
2056 /**
2057  * tb_switch_find_by_link_depth() - Find switch by link and depth
2058  * @tb: Domain the switch belongs
2059  * @link: Link number the switch is connected
2060  * @depth: Depth of the switch in link
2061  *
2062  * Returned switch has reference count increased so the caller needs to
2063  * call tb_switch_put() when done with the switch.
2064  */
2065 struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
2066 {
2067         struct tb_sw_lookup lookup;
2068         struct device *dev;
2069 
2070         memset(&lookup, 0, sizeof(lookup));
2071         lookup.tb = tb;
2072         lookup.link = link;
2073         lookup.depth = depth;
2074 
2075         dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2076         if (dev)
2077                 return tb_to_switch(dev);
2078 
2079         return NULL;
2080 }
2081 
2082 /**
2083  * tb_switch_find_by_uuid() - Find switch by UUID
2084  * @tb: Domain the switch belongs
2085  * @uuid: UUID to look for
2086  *
2087  * Returned switch has reference count increased so the caller needs to
2088  * call tb_switch_put() when done with the switch.
2089  */
2090 struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
2091 {
2092         struct tb_sw_lookup lookup;
2093         struct device *dev;
2094 
2095         memset(&lookup, 0, sizeof(lookup));
2096         lookup.tb = tb;
2097         lookup.uuid = uuid;
2098 
2099         dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2100         if (dev)
2101                 return tb_to_switch(dev);
2102 
2103         return NULL;
2104 }
2105 
2106 /**
2107  * tb_switch_find_by_route() - Find switch by route string
2108  * @tb: Domain the switch belongs
2109  * @route: Route string to look for
2110  *
2111  * Returned switch has reference count increased so the caller needs to
2112  * call tb_switch_put() when done with the switch.
2113  */
2114 struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
2115 {
2116         struct tb_sw_lookup lookup;
2117         struct device *dev;
2118 
2119         if (!route)
2120                 return tb_switch_get(tb->root_switch);
2121 
2122         memset(&lookup, 0, sizeof(lookup));
2123         lookup.tb = tb;
2124         lookup.route = route;
2125 
2126         dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2127         if (dev)
2128                 return tb_to_switch(dev);
2129 
2130         return NULL;
2131 }
2132 
2133 void tb_switch_exit(void)
2134 {
2135         ida_destroy(&nvm_ida);
2136 }
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root/drivers/thunderbolt/switch.c

DEFINITIONS
