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1// SPDX-License-Identifier: GPL-2.02/*3 * Thunderbolt driver - switch/port utility functions4 *5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>6 * Copyright (C) 2018, Intel Corporation7 */8 9#include <linux/delay.h>10#include <linux/idr.h>11#include <linux/module.h>12#include <linux/nvmem-provider.h>13#include <linux/pm_runtime.h>14#include <linux/sched/signal.h>15#include <linux/sizes.h>16#include <linux/slab.h>17#include <linux/string_helpers.h>18 19#include "tb.h"20 21/* Switch NVM support */22 23struct nvm_auth_status {24 struct list_head list;25 uuid_t uuid;26 u32 status;27};28 29/*30 * Hold NVM authentication failure status per switch This information31 * needs to stay around even when the switch gets power cycled so we32 * keep it separately.33 */34static LIST_HEAD(nvm_auth_status_cache);35static DEFINE_MUTEX(nvm_auth_status_lock);36 37static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw)38{39 struct nvm_auth_status *st;40 41 list_for_each_entry(st, &nvm_auth_status_cache, list) {42 if (uuid_equal(&st->uuid, sw->uuid))43 return st;44 }45 46 return NULL;47}48 49static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status)50{51 struct nvm_auth_status *st;52 53 mutex_lock(&nvm_auth_status_lock);54 st = __nvm_get_auth_status(sw);55 mutex_unlock(&nvm_auth_status_lock);56 57 *status = st ? st->status : 0;58}59 60static void nvm_set_auth_status(const struct tb_switch *sw, u32 status)61{62 struct nvm_auth_status *st;63 64 if (WARN_ON(!sw->uuid))65 return;66 67 mutex_lock(&nvm_auth_status_lock);68 st = __nvm_get_auth_status(sw);69 70 if (!st) {71 st = kzalloc(sizeof(*st), GFP_KERNEL);72 if (!st)73 goto unlock;74 75 memcpy(&st->uuid, sw->uuid, sizeof(st->uuid));76 INIT_LIST_HEAD(&st->list);77 list_add_tail(&st->list, &nvm_auth_status_cache);78 }79 80 st->status = status;81unlock:82 mutex_unlock(&nvm_auth_status_lock);83}84 85static void nvm_clear_auth_status(const struct tb_switch *sw)86{87 struct nvm_auth_status *st;88 89 mutex_lock(&nvm_auth_status_lock);90 st = __nvm_get_auth_status(sw);91 if (st) {92 list_del(&st->list);93 kfree(st);94 }95 mutex_unlock(&nvm_auth_status_lock);96}97 98static int nvm_validate_and_write(struct tb_switch *sw)99{100 unsigned int image_size;101 const u8 *buf;102 int ret;103 104 ret = tb_nvm_validate(sw->nvm);105 if (ret)106 return ret;107 108 ret = tb_nvm_write_headers(sw->nvm);109 if (ret)110 return ret;111 112 buf = sw->nvm->buf_data_start;113 image_size = sw->nvm->buf_data_size;114 115 if (tb_switch_is_usb4(sw))116 ret = usb4_switch_nvm_write(sw, 0, buf, image_size);117 else118 ret = dma_port_flash_write(sw->dma_port, 0, buf, image_size);119 if (ret)120 return ret;121 122 sw->nvm->flushed = true;123 return 0;124}125 126static int nvm_authenticate_host_dma_port(struct tb_switch *sw)127{128 int ret = 0;129 130 /*131 * Root switch NVM upgrade requires that we disconnect the132 * existing paths first (in case it is not in safe mode133 * already).134 */135 if (!sw->safe_mode) {136 u32 status;137 138 ret = tb_domain_disconnect_all_paths(sw->tb);139 if (ret)140 return ret;141 /*142 * The host controller goes away pretty soon after this if143 * everything goes well so getting timeout is expected.144 */145 ret = dma_port_flash_update_auth(sw->dma_port);146 if (!ret || ret == -ETIMEDOUT)147 return 0;148 149 /*150 * Any error from update auth operation requires power151 * cycling of the host router.152 */153 tb_sw_warn(sw, "failed to authenticate NVM, power cycling\n");154 if (dma_port_flash_update_auth_status(sw->dma_port, &status) > 0)155 nvm_set_auth_status(sw, status);156 }157 158 /*159 * From safe mode we can get out by just power cycling the160 * switch.161 */162 dma_port_power_cycle(sw->dma_port);163 return ret;164}165 166static int nvm_authenticate_device_dma_port(struct tb_switch *sw)167{168 int ret, retries = 10;169 170 ret = dma_port_flash_update_auth(sw->dma_port);171 switch (ret) {172 case 0:173 case -ETIMEDOUT:174 case -EACCES:175 case -EINVAL:176 /* Power cycle is required */177 break;178 default:179 return ret;180 }181 182 /*183 * Poll here for the authentication status. It takes some time184 * for the device to respond (we get timeout for a while). Once185 * we get response the device needs to be power cycled in order186 * to the new NVM to be taken into use.187 */188 do {189 u32 status;190 191 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);192 if (ret < 0 && ret != -ETIMEDOUT)193 return ret;194 if (ret > 0) {195 if (status) {196 tb_sw_warn(sw, "failed to authenticate NVM\n");197 nvm_set_auth_status(sw, status);198 }199 200 tb_sw_info(sw, "power cycling the switch now\n");201 dma_port_power_cycle(sw->dma_port);202 return 0;203 }204 205 msleep(500);206 } while (--retries);207 208 return -ETIMEDOUT;209}210 211static void nvm_authenticate_start_dma_port(struct tb_switch *sw)212{213 struct pci_dev *root_port;214 215 /*216 * During host router NVM upgrade we should not allow root port to217 * go into D3cold because some root ports cannot trigger PME218 * itself. To be on the safe side keep the root port in D0 during219 * the whole upgrade process.220 */221 root_port = pcie_find_root_port(sw->tb->nhi->pdev);222 if (root_port)223 pm_runtime_get_noresume(&root_port->dev);224}225 226static void nvm_authenticate_complete_dma_port(struct tb_switch *sw)227{228 struct pci_dev *root_port;229 230 root_port = pcie_find_root_port(sw->tb->nhi->pdev);231 if (root_port)232 pm_runtime_put(&root_port->dev);233}234 235static inline bool nvm_readable(struct tb_switch *sw)236{237 if (tb_switch_is_usb4(sw)) {238 /*239 * USB4 devices must support NVM operations but it is240 * optional for hosts. Therefore we query the NVM sector241 * size here and if it is supported assume NVM242 * operations are implemented.243 */244 return usb4_switch_nvm_sector_size(sw) > 0;245 }246 247 /* Thunderbolt 2 and 3 devices support NVM through DMA port */248 return !!sw->dma_port;249}250 251static inline bool nvm_upgradeable(struct tb_switch *sw)252{253 if (sw->no_nvm_upgrade)254 return false;255 return nvm_readable(sw);256}257 258static int nvm_authenticate(struct tb_switch *sw, bool auth_only)259{260 int ret;261 262 if (tb_switch_is_usb4(sw)) {263 if (auth_only) {264 ret = usb4_switch_nvm_set_offset(sw, 0);265 if (ret)266 return ret;267 }268 sw->nvm->authenticating = true;269 return usb4_switch_nvm_authenticate(sw);270 }271 if (auth_only)272 return -EOPNOTSUPP;273 274 sw->nvm->authenticating = true;275 if (!tb_route(sw)) {276 nvm_authenticate_start_dma_port(sw);277 ret = nvm_authenticate_host_dma_port(sw);278 } else {279 ret = nvm_authenticate_device_dma_port(sw);280 }281 282 return ret;283}284 285/**286 * tb_switch_nvm_read() - Read router NVM287 * @sw: Router whose NVM to read288 * @address: Start address on the NVM289 * @buf: Buffer where the read data is copied290 * @size: Size of the buffer in bytes291 *292 * Reads from router NVM and returns the requested data in @buf. Locking293 * is up to the caller. Returns %0 in success and negative errno in case294 * of failure.295 */296int tb_switch_nvm_read(struct tb_switch *sw, unsigned int address, void *buf,297 size_t size)298{299 if (tb_switch_is_usb4(sw))300 return usb4_switch_nvm_read(sw, address, buf, size);301 return dma_port_flash_read(sw->dma_port, address, buf, size);302}303 304static int nvm_read(void *priv, unsigned int offset, void *val, size_t bytes)305{306 struct tb_nvm *nvm = priv;307 struct tb_switch *sw = tb_to_switch(nvm->dev);308 int ret;309 310 pm_runtime_get_sync(&sw->dev);311 312 if (!mutex_trylock(&sw->tb->lock)) {313 ret = restart_syscall();314 goto out;315 }316 317 ret = tb_switch_nvm_read(sw, offset, val, bytes);318 mutex_unlock(&sw->tb->lock);319 320out:321 pm_runtime_mark_last_busy(&sw->dev);322 pm_runtime_put_autosuspend(&sw->dev);323 324 return ret;325}326 327static int nvm_write(void *priv, unsigned int offset, void *val, size_t bytes)328{329 struct tb_nvm *nvm = priv;330 struct tb_switch *sw = tb_to_switch(nvm->dev);331 int ret;332 333 if (!mutex_trylock(&sw->tb->lock))334 return restart_syscall();335 336 /*337 * Since writing the NVM image might require some special steps,338 * for example when CSS headers are written, we cache the image339 * locally here and handle the special cases when the user asks340 * us to authenticate the image.341 */342 ret = tb_nvm_write_buf(nvm, offset, val, bytes);343 mutex_unlock(&sw->tb->lock);344 345 return ret;346}347 348static int tb_switch_nvm_add(struct tb_switch *sw)349{350 struct tb_nvm *nvm;351 int ret;352 353 if (!nvm_readable(sw))354 return 0;355 356 nvm = tb_nvm_alloc(&sw->dev);357 if (IS_ERR(nvm)) {358 ret = PTR_ERR(nvm) == -EOPNOTSUPP ? 0 : PTR_ERR(nvm);359 goto err_nvm;360 }361 362 ret = tb_nvm_read_version(nvm);363 if (ret)364 goto err_nvm;365 366 /*367 * If the switch is in safe-mode the only accessible portion of368 * the NVM is the non-active one where userspace is expected to369 * write new functional NVM.370 */371 if (!sw->safe_mode) {372 ret = tb_nvm_add_active(nvm, nvm_read);373 if (ret)374 goto err_nvm;375 tb_sw_dbg(sw, "NVM version %x.%x\n", nvm->major, nvm->minor);376 }377 378 if (!sw->no_nvm_upgrade) {379 ret = tb_nvm_add_non_active(nvm, nvm_write);380 if (ret)381 goto err_nvm;382 }383 384 sw->nvm = nvm;385 return 0;386 387err_nvm:388 tb_sw_dbg(sw, "NVM upgrade disabled\n");389 sw->no_nvm_upgrade = true;390 if (!IS_ERR(nvm))391 tb_nvm_free(nvm);392 393 return ret;394}395 396static void tb_switch_nvm_remove(struct tb_switch *sw)397{398 struct tb_nvm *nvm;399 400 nvm = sw->nvm;401 sw->nvm = NULL;402 403 if (!nvm)404 return;405 406 /* Remove authentication status in case the switch is unplugged */407 if (!nvm->authenticating)408 nvm_clear_auth_status(sw);409 410 tb_nvm_free(nvm);411}412 413/* port utility functions */414 415static const char *tb_port_type(const struct tb_regs_port_header *port)416{417 switch (port->type >> 16) {418 case 0:419 switch ((u8) port->type) {420 case 0:421 return "Inactive";422 case 1:423 return "Port";424 case 2:425 return "NHI";426 default:427 return "unknown";428 }429 case 0x2:430 return "Ethernet";431 case 0x8:432 return "SATA";433 case 0xe:434 return "DP/HDMI";435 case 0x10:436 return "PCIe";437 case 0x20:438 return "USB";439 default:440 return "unknown";441 }442}443 444static void tb_dump_port(struct tb *tb, const struct tb_port *port)445{446 const struct tb_regs_port_header *regs = &port->config;447 448 tb_dbg(tb,449 " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",450 regs->port_number, regs->vendor_id, regs->device_id,451 regs->revision, regs->thunderbolt_version, tb_port_type(regs),452 regs->type);453 tb_dbg(tb, " Max hop id (in/out): %d/%d\n",454 regs->max_in_hop_id, regs->max_out_hop_id);455 tb_dbg(tb, " Max counters: %d\n", regs->max_counters);456 tb_dbg(tb, " NFC Credits: %#x\n", regs->nfc_credits);457 tb_dbg(tb, " Credits (total/control): %u/%u\n", port->total_credits,458 port->ctl_credits);459}460 461/**462 * tb_port_state() - get connectedness state of a port463 * @port: the port to check464 *465 * The port must have a TB_CAP_PHY (i.e. it should be a real port).466 *467 * Return: Returns an enum tb_port_state on success or an error code on failure.468 */469int tb_port_state(struct tb_port *port)470{471 struct tb_cap_phy phy;472 int res;473 if (port->cap_phy == 0) {474 tb_port_WARN(port, "does not have a PHY\n");475 return -EINVAL;476 }477 res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);478 if (res)479 return res;480 return phy.state;481}482 483/**484 * tb_wait_for_port() - wait for a port to become ready485 * @port: Port to wait486 * @wait_if_unplugged: Wait also when port is unplugged487 *488 * Wait up to 1 second for a port to reach state TB_PORT_UP. If489 * wait_if_unplugged is set then we also wait if the port is in state490 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after491 * switch resume). Otherwise we only wait if a device is registered but the link492 * has not yet been established.493 *494 * Return: Returns an error code on failure. Returns 0 if the port is not495 * connected or failed to reach state TB_PORT_UP within one second. Returns 1496 * if the port is connected and in state TB_PORT_UP.497 */498int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)499{500 int retries = 10;501 int state;502 if (!port->cap_phy) {503 tb_port_WARN(port, "does not have PHY\n");504 return -EINVAL;505 }506 if (tb_is_upstream_port(port)) {507 tb_port_WARN(port, "is the upstream port\n");508 return -EINVAL;509 }510 511 while (retries--) {512 state = tb_port_state(port);513 switch (state) {514 case TB_PORT_DISABLED:515 tb_port_dbg(port, "is disabled (state: 0)\n");516 return 0;517 518 case TB_PORT_UNPLUGGED:519 if (wait_if_unplugged) {520 /* used during resume */521 tb_port_dbg(port,522 "is unplugged (state: 7), retrying...\n");523 msleep(100);524 break;525 }526 tb_port_dbg(port, "is unplugged (state: 7)\n");527 return 0;528 529 case TB_PORT_UP:530 case TB_PORT_TX_CL0S:531 case TB_PORT_RX_CL0S:532 case TB_PORT_CL1:533 case TB_PORT_CL2:534 tb_port_dbg(port, "is connected, link is up (state: %d)\n", state);535 return 1;536 537 default:538 if (state < 0)539 return state;540 541 /*542 * After plug-in the state is TB_PORT_CONNECTING. Give it some543 * time.544 */545 tb_port_dbg(port,546 "is connected, link is not up (state: %d), retrying...\n",547 state);548 msleep(100);549 }550 551 }552 tb_port_warn(port,553 "failed to reach state TB_PORT_UP. Ignoring port...\n");554 return 0;555}556 557/**558 * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port559 * @port: Port to add/remove NFC credits560 * @credits: Credits to add/remove561 *562 * Change the number of NFC credits allocated to @port by @credits. To remove563 * NFC credits pass a negative amount of credits.564 *565 * Return: Returns 0 on success or an error code on failure.566 */567int tb_port_add_nfc_credits(struct tb_port *port, int credits)568{569 u32 nfc_credits;570 571 if (credits == 0 || port->sw->is_unplugged)572 return 0;573 574 /*575 * USB4 restricts programming NFC buffers to lane adapters only576 * so skip other ports.577 */578 if (tb_switch_is_usb4(port->sw) && !tb_port_is_null(port))579 return 0;580 581 nfc_credits = port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK;582 if (credits < 0)583 credits = max_t(int, -nfc_credits, credits);584 585 nfc_credits += credits;586 587 tb_port_dbg(port, "adding %d NFC credits to %lu", credits,588 port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK);589 590 port->config.nfc_credits &= ~ADP_CS_4_NFC_BUFFERS_MASK;591 port->config.nfc_credits |= nfc_credits;592 593 return tb_port_write(port, &port->config.nfc_credits,594 TB_CFG_PORT, ADP_CS_4, 1);595}596 597/**598 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER599 * @port: Port whose counters to clear600 * @counter: Counter index to clear601 *602 * Return: Returns 0 on success or an error code on failure.603 */604int tb_port_clear_counter(struct tb_port *port, int counter)605{606 u32 zero[3] = { 0, 0, 0 };607 tb_port_dbg(port, "clearing counter %d\n", counter);608 return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);609}610 611/**612 * tb_port_unlock() - Unlock downstream port613 * @port: Port to unlock614 *615 * Needed for USB4 but can be called for any CIO/USB4 ports. Makes the616 * downstream router accessible for CM.617 */618int tb_port_unlock(struct tb_port *port)619{620 if (tb_switch_is_icm(port->sw))621 return 0;622 if (!tb_port_is_null(port))623 return -EINVAL;624 if (tb_switch_is_usb4(port->sw))625 return usb4_port_unlock(port);626 return 0;627}628 629static int __tb_port_enable(struct tb_port *port, bool enable)630{631 int ret;632 u32 phy;633 634 if (!tb_port_is_null(port))635 return -EINVAL;636 637 ret = tb_port_read(port, &phy, TB_CFG_PORT,638 port->cap_phy + LANE_ADP_CS_1, 1);639 if (ret)640 return ret;641 642 if (enable)643 phy &= ~LANE_ADP_CS_1_LD;644 else645 phy |= LANE_ADP_CS_1_LD;646 647 648 ret = tb_port_write(port, &phy, TB_CFG_PORT,649 port->cap_phy + LANE_ADP_CS_1, 1);650 if (ret)651 return ret;652 653 tb_port_dbg(port, "lane %s\n", str_enabled_disabled(enable));654 return 0;655}656 657/**658 * tb_port_enable() - Enable lane adapter659 * @port: Port to enable (can be %NULL)660 *661 * This is used for lane 0 and 1 adapters to enable it.662 */663int tb_port_enable(struct tb_port *port)664{665 return __tb_port_enable(port, true);666}667 668/**669 * tb_port_disable() - Disable lane adapter670 * @port: Port to disable (can be %NULL)671 *672 * This is used for lane 0 and 1 adapters to disable it.673 */674int tb_port_disable(struct tb_port *port)675{676 return __tb_port_enable(port, false);677}678 679static int tb_port_reset(struct tb_port *port)680{681 if (tb_switch_is_usb4(port->sw))682 return port->cap_usb4 ? usb4_port_reset(port) : 0;683 return tb_lc_reset_port(port);684}685 686/*687 * tb_init_port() - initialize a port688 *689 * This is a helper method for tb_switch_alloc. Does not check or initialize690 * any downstream switches.691 *692 * Return: Returns 0 on success or an error code on failure.693 */694static int tb_init_port(struct tb_port *port)695{696 int res;697 int cap;698 699 INIT_LIST_HEAD(&port->list);700 701 /* Control adapter does not have configuration space */702 if (!port->port)703 return 0;704 705 res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);706 if (res) {707 if (res == -ENODEV) {708 tb_dbg(port->sw->tb, " Port %d: not implemented\n",709 port->port);710 port->disabled = true;711 return 0;712 }713 return res;714 }715 716 /* Port 0 is the switch itself and has no PHY. */717 if (port->config.type == TB_TYPE_PORT) {718 cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);719 720 if (cap > 0)721 port->cap_phy = cap;722 else723 tb_port_WARN(port, "non switch port without a PHY\n");724 725 cap = tb_port_find_cap(port, TB_PORT_CAP_USB4);726 if (cap > 0)727 port->cap_usb4 = cap;728 729 /*730 * USB4 ports the buffers allocated for the control path731 * can be read from the path config space. Legacy732 * devices we use hard-coded value.733 */734 if (port->cap_usb4) {735 struct tb_regs_hop hop;736 737 if (!tb_port_read(port, &hop, TB_CFG_HOPS, 0, 2))738 port->ctl_credits = hop.initial_credits;739 }740 if (!port->ctl_credits)741 port->ctl_credits = 2;742 743 } else {744 cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);745 if (cap > 0)746 port->cap_adap = cap;747 }748 749 port->total_credits =750 (port->config.nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>751 ADP_CS_4_TOTAL_BUFFERS_SHIFT;752 753 tb_dump_port(port->sw->tb, port);754 return 0;755}756 757static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,758 int max_hopid)759{760 int port_max_hopid;761 struct ida *ida;762 763 if (in) {764 port_max_hopid = port->config.max_in_hop_id;765 ida = &port->in_hopids;766 } else {767 port_max_hopid = port->config.max_out_hop_id;768 ida = &port->out_hopids;769 }770 771 /*772 * NHI can use HopIDs 1-max for other adapters HopIDs 0-7 are773 * reserved.774 */775 if (!tb_port_is_nhi(port) && min_hopid < TB_PATH_MIN_HOPID)776 min_hopid = TB_PATH_MIN_HOPID;777 778 if (max_hopid < 0 || max_hopid > port_max_hopid)779 max_hopid = port_max_hopid;780 781 return ida_alloc_range(ida, min_hopid, max_hopid, GFP_KERNEL);782}783 784/**785 * tb_port_alloc_in_hopid() - Allocate input HopID from port786 * @port: Port to allocate HopID for787 * @min_hopid: Minimum acceptable input HopID788 * @max_hopid: Maximum acceptable input HopID789 *790 * Return: HopID between @min_hopid and @max_hopid or negative errno in791 * case of error.792 */793int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)794{795 return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);796}797 798/**799 * tb_port_alloc_out_hopid() - Allocate output HopID from port800 * @port: Port to allocate HopID for801 * @min_hopid: Minimum acceptable output HopID802 * @max_hopid: Maximum acceptable output HopID803 *804 * Return: HopID between @min_hopid and @max_hopid or negative errno in805 * case of error.806 */807int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)808{809 return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);810}811 812/**813 * tb_port_release_in_hopid() - Release allocated input HopID from port814 * @port: Port whose HopID to release815 * @hopid: HopID to release816 */817void tb_port_release_in_hopid(struct tb_port *port, int hopid)818{819 ida_free(&port->in_hopids, hopid);820}821 822/**823 * tb_port_release_out_hopid() - Release allocated output HopID from port824 * @port: Port whose HopID to release825 * @hopid: HopID to release826 */827void tb_port_release_out_hopid(struct tb_port *port, int hopid)828{829 ida_free(&port->out_hopids, hopid);830}831 832static inline bool tb_switch_is_reachable(const struct tb_switch *parent,833 const struct tb_switch *sw)834{835 u64 mask = (1ULL << parent->config.depth * 8) - 1;836 return (tb_route(parent) & mask) == (tb_route(sw) & mask);837}838 839/**840 * tb_next_port_on_path() - Return next port for given port on a path841 * @start: Start port of the walk842 * @end: End port of the walk843 * @prev: Previous port (%NULL if this is the first)844 *845 * This function can be used to walk from one port to another if they846 * are connected through zero or more switches. If the @prev is dual847 * link port, the function follows that link and returns another end on848 * that same link.849 *850 * If the @end port has been reached, return %NULL.851 *852 * Domain tb->lock must be held when this function is called.853 */854struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,855 struct tb_port *prev)856{857 struct tb_port *next;858 859 if (!prev)860 return start;861 862 if (prev->sw == end->sw) {863 if (prev == end)864 return NULL;865 return end;866 }867 868 if (tb_switch_is_reachable(prev->sw, end->sw)) {869 next = tb_port_at(tb_route(end->sw), prev->sw);870 /* Walk down the topology if next == prev */871 if (prev->remote &&872 (next == prev || next->dual_link_port == prev))873 next = prev->remote;874 } else {875 if (tb_is_upstream_port(prev)) {876 next = prev->remote;877 } else {878 next = tb_upstream_port(prev->sw);879 /*880 * Keep the same link if prev and next are both881 * dual link ports.882 */883 if (next->dual_link_port &&884 next->link_nr != prev->link_nr) {885 next = next->dual_link_port;886 }887 }888 }889 890 return next != prev ? next : NULL;891}892 893/**894 * tb_port_get_link_speed() - Get current link speed895 * @port: Port to check (USB4 or CIO)896 *897 * Returns link speed in Gb/s or negative errno in case of failure.898 */899int tb_port_get_link_speed(struct tb_port *port)900{901 u32 val, speed;902 int ret;903 904 if (!port->cap_phy)905 return -EINVAL;906 907 ret = tb_port_read(port, &val, TB_CFG_PORT,908 port->cap_phy + LANE_ADP_CS_1, 1);909 if (ret)910 return ret;911 912 speed = (val & LANE_ADP_CS_1_CURRENT_SPEED_MASK) >>913 LANE_ADP_CS_1_CURRENT_SPEED_SHIFT;914 915 switch (speed) {916 case LANE_ADP_CS_1_CURRENT_SPEED_GEN4:917 return 40;918 case LANE_ADP_CS_1_CURRENT_SPEED_GEN3:919 return 20;920 default:921 return 10;922 }923}924 925/**926 * tb_port_get_link_generation() - Returns link generation927 * @port: Lane adapter928 *929 * Returns link generation as number or negative errno in case of930 * failure. Does not distinguish between Thunderbolt 1 and Thunderbolt 2931 * links so for those always returns 2.932 */933int tb_port_get_link_generation(struct tb_port *port)934{935 int ret;936 937 ret = tb_port_get_link_speed(port);938 if (ret < 0)939 return ret;940 941 switch (ret) {942 case 40:943 return 4;944 case 20:945 return 3;946 default:947 return 2;948 }949}950 951/**952 * tb_port_get_link_width() - Get current link width953 * @port: Port to check (USB4 or CIO)954 *955 * Returns link width. Return the link width as encoded in &enum956 * tb_link_width or negative errno in case of failure.957 */958int tb_port_get_link_width(struct tb_port *port)959{960 u32 val;961 int ret;962 963 if (!port->cap_phy)964 return -EINVAL;965 966 ret = tb_port_read(port, &val, TB_CFG_PORT,967 port->cap_phy + LANE_ADP_CS_1, 1);968 if (ret)969 return ret;970 971 /* Matches the values in enum tb_link_width */972 return (val & LANE_ADP_CS_1_CURRENT_WIDTH_MASK) >>973 LANE_ADP_CS_1_CURRENT_WIDTH_SHIFT;974}975 976/**977 * tb_port_width_supported() - Is the given link width supported978 * @port: Port to check979 * @width: Widths to check (bitmask)980 *981 * Can be called to any lane adapter. Checks if given @width is982 * supported by the hardware and returns %true if it is.983 */984bool tb_port_width_supported(struct tb_port *port, unsigned int width)985{986 u32 phy, widths;987 int ret;988 989 if (!port->cap_phy)990 return false;991 992 if (width & (TB_LINK_WIDTH_ASYM_TX | TB_LINK_WIDTH_ASYM_RX)) {993 if (tb_port_get_link_generation(port) < 4 ||994 !usb4_port_asym_supported(port))995 return false;996 }997 998 ret = tb_port_read(port, &phy, TB_CFG_PORT,999 port->cap_phy + LANE_ADP_CS_0, 1);1000 if (ret)1001 return false;1002 1003 /*1004 * The field encoding is the same as &enum tb_link_width (which is1005 * passed to @width).1006 */1007 widths = FIELD_GET(LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK, phy);1008 return widths & width;1009}1010 1011/**1012 * tb_port_set_link_width() - Set target link width of the lane adapter1013 * @port: Lane adapter1014 * @width: Target link width1015 *1016 * Sets the target link width of the lane adapter to @width. Does not1017 * enable/disable lane bonding. For that call tb_port_set_lane_bonding().1018 *1019 * Return: %0 in case of success and negative errno in case of error1020 */1021int tb_port_set_link_width(struct tb_port *port, enum tb_link_width width)1022{1023 u32 val;1024 int ret;1025 1026 if (!port->cap_phy)1027 return -EINVAL;1028 1029 ret = tb_port_read(port, &val, TB_CFG_PORT,1030 port->cap_phy + LANE_ADP_CS_1, 1);1031 if (ret)1032 return ret;1033 1034 val &= ~LANE_ADP_CS_1_TARGET_WIDTH_MASK;1035 switch (width) {1036 case TB_LINK_WIDTH_SINGLE:1037 /* Gen 4 link cannot be single */1038 if (tb_port_get_link_generation(port) >= 4)1039 return -EOPNOTSUPP;1040 val |= LANE_ADP_CS_1_TARGET_WIDTH_SINGLE <<1041 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;1042 break;1043 1044 case TB_LINK_WIDTH_DUAL:1045 if (tb_port_get_link_generation(port) >= 4)1046 return usb4_port_asym_set_link_width(port, width);1047 val |= LANE_ADP_CS_1_TARGET_WIDTH_DUAL <<1048 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;1049 break;1050 1051 case TB_LINK_WIDTH_ASYM_TX:1052 case TB_LINK_WIDTH_ASYM_RX:1053 return usb4_port_asym_set_link_width(port, width);1054 1055 default:1056 return -EINVAL;1057 }1058 1059 return tb_port_write(port, &val, TB_CFG_PORT,1060 port->cap_phy + LANE_ADP_CS_1, 1);1061}1062 1063/**1064 * tb_port_set_lane_bonding() - Enable/disable lane bonding1065 * @port: Lane adapter1066 * @bonding: enable/disable bonding1067 *1068 * Enables or disables lane bonding. This should be called after target1069 * link width has been set (tb_port_set_link_width()). Note in most1070 * cases one should use tb_port_lane_bonding_enable() instead to enable1071 * lane bonding.1072 *1073 * Return: %0 in case of success and negative errno in case of error1074 */1075static int tb_port_set_lane_bonding(struct tb_port *port, bool bonding)1076{1077 u32 val;1078 int ret;1079 1080 if (!port->cap_phy)1081 return -EINVAL;1082 1083 ret = tb_port_read(port, &val, TB_CFG_PORT,1084 port->cap_phy + LANE_ADP_CS_1, 1);1085 if (ret)1086 return ret;1087 1088 if (bonding)1089 val |= LANE_ADP_CS_1_LB;1090 else1091 val &= ~LANE_ADP_CS_1_LB;1092 1093 return tb_port_write(port, &val, TB_CFG_PORT,1094 port->cap_phy + LANE_ADP_CS_1, 1);1095}1096 1097/**1098 * tb_port_lane_bonding_enable() - Enable bonding on port1099 * @port: port to enable1100 *1101 * Enable bonding by setting the link width of the port and the other1102 * port in case of dual link port. Does not wait for the link to1103 * actually reach the bonded state so caller needs to call1104 * tb_port_wait_for_link_width() before enabling any paths through the1105 * link to make sure the link is in expected state.1106 *1107 * Return: %0 in case of success and negative errno in case of error1108 */1109int tb_port_lane_bonding_enable(struct tb_port *port)1110{1111 enum tb_link_width width;1112 int ret;1113 1114 /*1115 * Enable lane bonding for both links if not already enabled by1116 * for example the boot firmware.1117 */1118 width = tb_port_get_link_width(port);1119 if (width == TB_LINK_WIDTH_SINGLE) {1120 ret = tb_port_set_link_width(port, TB_LINK_WIDTH_DUAL);1121 if (ret)1122 goto err_lane0;1123 }1124 1125 width = tb_port_get_link_width(port->dual_link_port);1126 if (width == TB_LINK_WIDTH_SINGLE) {1127 ret = tb_port_set_link_width(port->dual_link_port,1128 TB_LINK_WIDTH_DUAL);1129 if (ret)1130 goto err_lane1;1131 }1132 1133 /*1134 * Only set bonding if the link was not already bonded. This1135 * avoids the lane adapter to re-enter bonding state.1136 */1137 if (width == TB_LINK_WIDTH_SINGLE && !tb_is_upstream_port(port)) {1138 ret = tb_port_set_lane_bonding(port, true);1139 if (ret)1140 goto err_lane1;1141 }1142 1143 /*1144 * When lane 0 bonding is set it will affect lane 1 too so1145 * update both.1146 */1147 port->bonded = true;1148 port->dual_link_port->bonded = true;1149 1150 return 0;1151 1152err_lane1:1153 tb_port_set_link_width(port->dual_link_port, TB_LINK_WIDTH_SINGLE);1154err_lane0:1155 tb_port_set_link_width(port, TB_LINK_WIDTH_SINGLE);1156 1157 return ret;1158}1159 1160/**1161 * tb_port_lane_bonding_disable() - Disable bonding on port1162 * @port: port to disable1163 *1164 * Disable bonding by setting the link width of the port and the1165 * other port in case of dual link port.1166 */1167void tb_port_lane_bonding_disable(struct tb_port *port)1168{1169 tb_port_set_lane_bonding(port, false);1170 tb_port_set_link_width(port->dual_link_port, TB_LINK_WIDTH_SINGLE);1171 tb_port_set_link_width(port, TB_LINK_WIDTH_SINGLE);1172 port->dual_link_port->bonded = false;1173 port->bonded = false;1174}1175 1176/**1177 * tb_port_wait_for_link_width() - Wait until link reaches specific width1178 * @port: Port to wait for1179 * @width: Expected link width (bitmask)1180 * @timeout_msec: Timeout in ms how long to wait1181 *1182 * Should be used after both ends of the link have been bonded (or1183 * bonding has been disabled) to wait until the link actually reaches1184 * the expected state. Returns %-ETIMEDOUT if the width was not reached1185 * within the given timeout, %0 if it did. Can be passed a mask of1186 * expected widths and succeeds if any of the widths is reached.1187 */1188int tb_port_wait_for_link_width(struct tb_port *port, unsigned int width,1189 int timeout_msec)1190{1191 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);1192 int ret;1193 1194 /* Gen 4 link does not support single lane */1195 if ((width & TB_LINK_WIDTH_SINGLE) &&1196 tb_port_get_link_generation(port) >= 4)1197 return -EOPNOTSUPP;1198 1199 do {1200 ret = tb_port_get_link_width(port);1201 if (ret < 0) {1202 /*1203 * Sometimes we get port locked error when1204 * polling the lanes so we can ignore it and1205 * retry.1206 */1207 if (ret != -EACCES)1208 return ret;1209 } else if (ret & width) {1210 return 0;1211 }1212 1213 usleep_range(1000, 2000);1214 } while (ktime_before(ktime_get(), timeout));1215 1216 return -ETIMEDOUT;1217}1218 1219static int tb_port_do_update_credits(struct tb_port *port)1220{1221 u32 nfc_credits;1222 int ret;1223 1224 ret = tb_port_read(port, &nfc_credits, TB_CFG_PORT, ADP_CS_4, 1);1225 if (ret)1226 return ret;1227 1228 if (nfc_credits != port->config.nfc_credits) {1229 u32 total;1230 1231 total = (nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>1232 ADP_CS_4_TOTAL_BUFFERS_SHIFT;1233 1234 tb_port_dbg(port, "total credits changed %u -> %u\n",1235 port->total_credits, total);1236 1237 port->config.nfc_credits = nfc_credits;1238 port->total_credits = total;1239 }1240 1241 return 0;1242}1243 1244/**1245 * tb_port_update_credits() - Re-read port total credits1246 * @port: Port to update1247 *1248 * After the link is bonded (or bonding was disabled) the port total1249 * credits may change, so this function needs to be called to re-read1250 * the credits. Updates also the second lane adapter.1251 */1252int tb_port_update_credits(struct tb_port *port)1253{1254 int ret;1255 1256 ret = tb_port_do_update_credits(port);1257 if (ret)1258 return ret;1259 1260 if (!port->dual_link_port)1261 return 0;1262 return tb_port_do_update_credits(port->dual_link_port);1263}1264 1265static int tb_port_start_lane_initialization(struct tb_port *port)1266{1267 int ret;1268 1269 if (tb_switch_is_usb4(port->sw))1270 return 0;1271 1272 ret = tb_lc_start_lane_initialization(port);1273 return ret == -EINVAL ? 0 : ret;1274}1275 1276/*1277 * Returns true if the port had something (router, XDomain) connected1278 * before suspend.1279 */1280static bool tb_port_resume(struct tb_port *port)1281{1282 bool has_remote = tb_port_has_remote(port);1283 1284 if (port->usb4) {1285 usb4_port_device_resume(port->usb4);1286 } else if (!has_remote) {1287 /*1288 * For disconnected downstream lane adapters start lane1289 * initialization now so we detect future connects.1290 *1291 * For XDomain start the lane initialzation now so the1292 * link gets re-established.1293 *1294 * This is only needed for non-USB4 ports.1295 */1296 if (!tb_is_upstream_port(port) || port->xdomain)1297 tb_port_start_lane_initialization(port);1298 }1299 1300 return has_remote || port->xdomain;1301}1302 1303/**1304 * tb_port_is_enabled() - Is the adapter port enabled1305 * @port: Port to check1306 */1307bool tb_port_is_enabled(struct tb_port *port)1308{1309 switch (port->config.type) {1310 case TB_TYPE_PCIE_UP:1311 case TB_TYPE_PCIE_DOWN:1312 return tb_pci_port_is_enabled(port);1313 1314 case TB_TYPE_DP_HDMI_IN:1315 case TB_TYPE_DP_HDMI_OUT:1316 return tb_dp_port_is_enabled(port);1317 1318 case TB_TYPE_USB3_UP:1319 case TB_TYPE_USB3_DOWN:1320 return tb_usb3_port_is_enabled(port);1321 1322 default:1323 return false;1324 }1325}1326 1327/**1328 * tb_usb3_port_is_enabled() - Is the USB3 adapter port enabled1329 * @port: USB3 adapter port to check1330 */1331bool tb_usb3_port_is_enabled(struct tb_port *port)1332{1333 u32 data;1334 1335 if (tb_port_read(port, &data, TB_CFG_PORT,1336 port->cap_adap + ADP_USB3_CS_0, 1))1337 return false;1338 1339 return !!(data & ADP_USB3_CS_0_PE);1340}1341 1342/**1343 * tb_usb3_port_enable() - Enable USB3 adapter port1344 * @port: USB3 adapter port to enable1345 * @enable: Enable/disable the USB3 adapter1346 */1347int tb_usb3_port_enable(struct tb_port *port, bool enable)1348{1349 u32 word = enable ? (ADP_USB3_CS_0_PE | ADP_USB3_CS_0_V)1350 : ADP_USB3_CS_0_V;1351 1352 if (!port->cap_adap)1353 return -ENXIO;1354 return tb_port_write(port, &word, TB_CFG_PORT,1355 port->cap_adap + ADP_USB3_CS_0, 1);1356}1357 1358/**1359 * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled1360 * @port: PCIe port to check1361 */1362bool tb_pci_port_is_enabled(struct tb_port *port)1363{1364 u32 data;1365 1366 if (tb_port_read(port, &data, TB_CFG_PORT,1367 port->cap_adap + ADP_PCIE_CS_0, 1))1368 return false;1369 1370 return !!(data & ADP_PCIE_CS_0_PE);1371}1372 1373/**1374 * tb_pci_port_enable() - Enable PCIe adapter port1375 * @port: PCIe port to enable1376 * @enable: Enable/disable the PCIe adapter1377 */1378int tb_pci_port_enable(struct tb_port *port, bool enable)1379{1380 u32 word = enable ? ADP_PCIE_CS_0_PE : 0x0;1381 if (!port->cap_adap)1382 return -ENXIO;1383 return tb_port_write(port, &word, TB_CFG_PORT,1384 port->cap_adap + ADP_PCIE_CS_0, 1);1385}1386 1387/**1388 * tb_dp_port_hpd_is_active() - Is HPD already active1389 * @port: DP out port to check1390 *1391 * Checks if the DP OUT adapter port has HPD bit already set.1392 */1393int tb_dp_port_hpd_is_active(struct tb_port *port)1394{1395 u32 data;1396 int ret;1397 1398 ret = tb_port_read(port, &data, TB_CFG_PORT,1399 port->cap_adap + ADP_DP_CS_2, 1);1400 if (ret)1401 return ret;1402 1403 return !!(data & ADP_DP_CS_2_HPD);1404}1405 1406/**1407 * tb_dp_port_hpd_clear() - Clear HPD from DP IN port1408 * @port: Port to clear HPD1409 *1410 * If the DP IN port has HPD set, this function can be used to clear it.1411 */1412int tb_dp_port_hpd_clear(struct tb_port *port)1413{1414 u32 data;1415 int ret;1416 1417 ret = tb_port_read(port, &data, TB_CFG_PORT,1418 port->cap_adap + ADP_DP_CS_3, 1);1419 if (ret)1420 return ret;1421 1422 data |= ADP_DP_CS_3_HPDC;1423 return tb_port_write(port, &data, TB_CFG_PORT,1424 port->cap_adap + ADP_DP_CS_3, 1);1425}1426 1427/**1428 * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port1429 * @port: DP IN/OUT port to set hops1430 * @video: Video Hop ID1431 * @aux_tx: AUX TX Hop ID1432 * @aux_rx: AUX RX Hop ID1433 *1434 * Programs specified Hop IDs for DP IN/OUT port. Can be called for USB41435 * router DP adapters too but does not program the values as the fields1436 * are read-only.1437 */1438int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,1439 unsigned int aux_tx, unsigned int aux_rx)1440{1441 u32 data[2];1442 int ret;1443 1444 if (tb_switch_is_usb4(port->sw))1445 return 0;1446 1447 ret = tb_port_read(port, data, TB_CFG_PORT,1448 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));1449 if (ret)1450 return ret;1451 1452 data[0] &= ~ADP_DP_CS_0_VIDEO_HOPID_MASK;1453 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;1454 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;1455 1456 data[0] |= (video << ADP_DP_CS_0_VIDEO_HOPID_SHIFT) &1457 ADP_DP_CS_0_VIDEO_HOPID_MASK;1458 data[1] |= aux_tx & ADP_DP_CS_1_AUX_TX_HOPID_MASK;1459 data[1] |= (aux_rx << ADP_DP_CS_1_AUX_RX_HOPID_SHIFT) &1460 ADP_DP_CS_1_AUX_RX_HOPID_MASK;1461 1462 return tb_port_write(port, data, TB_CFG_PORT,1463 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));1464}1465 1466/**1467 * tb_dp_port_is_enabled() - Is DP adapter port enabled1468 * @port: DP adapter port to check1469 */1470bool tb_dp_port_is_enabled(struct tb_port *port)1471{1472 u32 data[2];1473 1474 if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap + ADP_DP_CS_0,1475 ARRAY_SIZE(data)))1476 return false;1477 1478 return !!(data[0] & (ADP_DP_CS_0_VE | ADP_DP_CS_0_AE));1479}1480 1481/**1482 * tb_dp_port_enable() - Enables/disables DP paths of a port1483 * @port: DP IN/OUT port1484 * @enable: Enable/disable DP path1485 *1486 * Once Hop IDs are programmed DP paths can be enabled or disabled by1487 * calling this function.1488 */1489int tb_dp_port_enable(struct tb_port *port, bool enable)1490{1491 u32 data[2];1492 int ret;1493 1494 ret = tb_port_read(port, data, TB_CFG_PORT,1495 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));1496 if (ret)1497 return ret;1498 1499 if (enable)1500 data[0] |= ADP_DP_CS_0_VE | ADP_DP_CS_0_AE;1501 else1502 data[0] &= ~(ADP_DP_CS_0_VE | ADP_DP_CS_0_AE);1503 1504 return tb_port_write(port, data, TB_CFG_PORT,1505 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));1506}1507 1508/* switch utility functions */1509 1510static const char *tb_switch_generation_name(const struct tb_switch *sw)1511{1512 switch (sw->generation) {1513 case 1:1514 return "Thunderbolt 1";1515 case 2:1516 return "Thunderbolt 2";1517 case 3:1518 return "Thunderbolt 3";1519 case 4:1520 return "USB4";1521 default:1522 return "Unknown";1523 }1524}1525 1526static void tb_dump_switch(const struct tb *tb, const struct tb_switch *sw)1527{1528 const struct tb_regs_switch_header *regs = &sw->config;1529 1530 tb_dbg(tb, " %s Switch: %x:%x (Revision: %d, TB Version: %d)\n",1531 tb_switch_generation_name(sw), regs->vendor_id, regs->device_id,1532 regs->revision, regs->thunderbolt_version);1533 tb_dbg(tb, " Max Port Number: %d\n", regs->max_port_number);1534 tb_dbg(tb, " Config:\n");1535 tb_dbg(tb,1536 " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",1537 regs->upstream_port_number, regs->depth,1538 (((u64) regs->route_hi) << 32) | regs->route_lo,1539 regs->enabled, regs->plug_events_delay);1540 tb_dbg(tb, " unknown1: %#x unknown4: %#x\n",1541 regs->__unknown1, regs->__unknown4);1542}1543 1544static int tb_switch_reset_host(struct tb_switch *sw)1545{1546 if (sw->generation > 1) {1547 struct tb_port *port;1548 1549 tb_switch_for_each_port(sw, port) {1550 int i, ret;1551 1552 /*1553 * For lane adapters we issue downstream port1554 * reset and clear up path config spaces.1555 *1556 * For protocol adapters we disable the path and1557 * clear path config space one by one (from 8 to1558 * Max Input HopID of the adapter).1559 */1560 if (tb_port_is_null(port) && !tb_is_upstream_port(port)) {1561 ret = tb_port_reset(port);1562 if (ret)1563 return ret;1564 } else if (tb_port_is_usb3_down(port) ||1565 tb_port_is_usb3_up(port)) {1566 tb_usb3_port_enable(port, false);1567 } else if (tb_port_is_dpin(port) ||1568 tb_port_is_dpout(port)) {1569 tb_dp_port_enable(port, false);1570 } else if (tb_port_is_pcie_down(port) ||1571 tb_port_is_pcie_up(port)) {1572 tb_pci_port_enable(port, false);1573 } else {1574 continue;1575 }1576 1577 /* Cleanup path config space of protocol adapter */1578 for (i = TB_PATH_MIN_HOPID;1579 i <= port->config.max_in_hop_id; i++) {1580 ret = tb_path_deactivate_hop(port, i);1581 if (ret)1582 return ret;1583 }1584 }1585 } else {1586 struct tb_cfg_result res;1587 1588 /* Thunderbolt 1 uses the "reset" config space packet */1589 res.err = tb_sw_write(sw, ((u32 *) &sw->config) + 2,1590 TB_CFG_SWITCH, 2, 2);1591 if (res.err)1592 return res.err;1593 res = tb_cfg_reset(sw->tb->ctl, tb_route(sw));1594 if (res.err > 0)1595 return -EIO;1596 else if (res.err < 0)1597 return res.err;1598 }1599 1600 return 0;1601}1602 1603static int tb_switch_reset_device(struct tb_switch *sw)1604{1605 return tb_port_reset(tb_switch_downstream_port(sw));1606}1607 1608static bool tb_switch_enumerated(struct tb_switch *sw)1609{1610 u32 val;1611 int ret;1612 1613 /*1614 * Read directly from the hardware because we use this also1615 * during system sleep where sw->config.enabled is already set1616 * by us.1617 */1618 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_3, 1);1619 if (ret)1620 return false;1621 1622 return !!(val & ROUTER_CS_3_V);1623}1624 1625/**1626 * tb_switch_reset() - Perform reset to the router1627 * @sw: Router to reset1628 *1629 * Issues reset to the router @sw. Can be used for any router. For host1630 * routers, resets all the downstream ports and cleans up path config1631 * spaces accordingly. For device routers issues downstream port reset1632 * through the parent router, so as side effect there will be unplug1633 * soon after this is finished.1634 *1635 * If the router is not enumerated does nothing.1636 *1637 * Returns %0 on success or negative errno in case of failure.1638 */1639int tb_switch_reset(struct tb_switch *sw)1640{1641 int ret;1642 1643 /*1644 * We cannot access the port config spaces unless the router is1645 * already enumerated. If the router is not enumerated it is1646 * equal to being reset so we can skip that here.1647 */1648 if (!tb_switch_enumerated(sw))1649 return 0;1650 1651 tb_sw_dbg(sw, "resetting\n");1652 1653 if (tb_route(sw))1654 ret = tb_switch_reset_device(sw);1655 else1656 ret = tb_switch_reset_host(sw);1657 1658 if (ret)1659 tb_sw_warn(sw, "failed to reset\n");1660 1661 return ret;1662}1663 1664/**1665 * tb_switch_wait_for_bit() - Wait for specified value of bits in offset1666 * @sw: Router to read the offset value from1667 * @offset: Offset in the router config space to read from1668 * @bit: Bit mask in the offset to wait for1669 * @value: Value of the bits to wait for1670 * @timeout_msec: Timeout in ms how long to wait1671 *1672 * Wait till the specified bits in specified offset reach specified value.1673 * Returns %0 in case of success, %-ETIMEDOUT if the @value was not reached1674 * within the given timeout or a negative errno in case of failure.1675 */1676int tb_switch_wait_for_bit(struct tb_switch *sw, u32 offset, u32 bit,1677 u32 value, int timeout_msec)1678{1679 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);1680 1681 do {1682 u32 val;1683 int ret;1684 1685 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);1686 if (ret)1687 return ret;1688 1689 if ((val & bit) == value)1690 return 0;1691 1692 usleep_range(50, 100);1693 } while (ktime_before(ktime_get(), timeout));1694 1695 return -ETIMEDOUT;1696}1697 1698/*1699 * tb_plug_events_active() - enable/disable plug events on a switch1700 *1701 * Also configures a sane plug_events_delay of 255ms.1702 *1703 * Return: Returns 0 on success or an error code on failure.1704 */1705static int tb_plug_events_active(struct tb_switch *sw, bool active)1706{1707 u32 data;1708 int res;1709 1710 if (tb_switch_is_icm(sw) || tb_switch_is_usb4(sw))1711 return 0;1712 1713 sw->config.plug_events_delay = 0xff;1714 res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);1715 if (res)1716 return res;1717 1718 res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);1719 if (res)1720 return res;1721 1722 if (active) {1723 data = data & 0xFFFFFF83;1724 switch (sw->config.device_id) {1725 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:1726 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:1727 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:1728 break;1729 default:1730 /*1731 * Skip Alpine Ridge, it needs to have vendor1732 * specific USB hotplug event enabled for the1733 * internal xHCI to work.1734 */1735 if (!tb_switch_is_alpine_ridge(sw))1736 data |= TB_PLUG_EVENTS_USB_DISABLE;1737 }1738 } else {1739 data = data | 0x7c;1740 }1741 return tb_sw_write(sw, &data, TB_CFG_SWITCH,1742 sw->cap_plug_events + 1, 1);1743}1744 1745static ssize_t authorized_show(struct device *dev,1746 struct device_attribute *attr,1747 char *buf)1748{1749 struct tb_switch *sw = tb_to_switch(dev);1750 1751 return sysfs_emit(buf, "%u\n", sw->authorized);1752}1753 1754static int disapprove_switch(struct device *dev, void *not_used)1755{1756 char *envp[] = { "AUTHORIZED=0", NULL };1757 struct tb_switch *sw;1758 1759 sw = tb_to_switch(dev);1760 if (sw && sw->authorized) {1761 int ret;1762 1763 /* First children */1764 ret = device_for_each_child_reverse(&sw->dev, NULL, disapprove_switch);1765 if (ret)1766 return ret;1767 1768 ret = tb_domain_disapprove_switch(sw->tb, sw);1769 if (ret)1770 return ret;1771 1772 sw->authorized = 0;1773 kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);1774 }1775 1776 return 0;1777}1778 1779static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)1780{1781 char envp_string[13];1782 int ret = -EINVAL;1783 char *envp[] = { envp_string, NULL };1784 1785 if (!mutex_trylock(&sw->tb->lock))1786 return restart_syscall();1787 1788 if (!!sw->authorized == !!val)1789 goto unlock;1790 1791 switch (val) {1792 /* Disapprove switch */1793 case 0:1794 if (tb_route(sw)) {1795 ret = disapprove_switch(&sw->dev, NULL);1796 goto unlock;1797 }1798 break;1799 1800 /* Approve switch */1801 case 1:1802 if (sw->key)1803 ret = tb_domain_approve_switch_key(sw->tb, sw);1804 else1805 ret = tb_domain_approve_switch(sw->tb, sw);1806 break;1807 1808 /* Challenge switch */1809 case 2:1810 if (sw->key)1811 ret = tb_domain_challenge_switch_key(sw->tb, sw);1812 break;1813 1814 default:1815 break;1816 }1817 1818 if (!ret) {1819 sw->authorized = val;1820 /*1821 * Notify status change to the userspace, informing the new1822 * value of /sys/bus/thunderbolt/devices/.../authorized.1823 */1824 sprintf(envp_string, "AUTHORIZED=%u", sw->authorized);1825 kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);1826 }1827 1828unlock:1829 mutex_unlock(&sw->tb->lock);1830 return ret;1831}1832 1833static ssize_t authorized_store(struct device *dev,1834 struct device_attribute *attr,1835 const char *buf, size_t count)1836{1837 struct tb_switch *sw = tb_to_switch(dev);1838 unsigned int val;1839 ssize_t ret;1840 1841 ret = kstrtouint(buf, 0, &val);1842 if (ret)1843 return ret;1844 if (val > 2)1845 return -EINVAL;1846 1847 pm_runtime_get_sync(&sw->dev);1848 ret = tb_switch_set_authorized(sw, val);1849 pm_runtime_mark_last_busy(&sw->dev);1850 pm_runtime_put_autosuspend(&sw->dev);1851 1852 return ret ? ret : count;1853}1854static DEVICE_ATTR_RW(authorized);1855 1856static ssize_t boot_show(struct device *dev, struct device_attribute *attr,1857 char *buf)1858{1859 struct tb_switch *sw = tb_to_switch(dev);1860 1861 return sysfs_emit(buf, "%u\n", sw->boot);1862}1863static DEVICE_ATTR_RO(boot);1864 1865static ssize_t device_show(struct device *dev, struct device_attribute *attr,1866 char *buf)1867{1868 struct tb_switch *sw = tb_to_switch(dev);1869 1870 return sysfs_emit(buf, "%#x\n", sw->device);1871}1872static DEVICE_ATTR_RO(device);1873 1874static ssize_t1875device_name_show(struct device *dev, struct device_attribute *attr, char *buf)1876{1877 struct tb_switch *sw = tb_to_switch(dev);1878 1879 return sysfs_emit(buf, "%s\n", sw->device_name ?: "");1880}1881static DEVICE_ATTR_RO(device_name);1882 1883static ssize_t1884generation_show(struct device *dev, struct device_attribute *attr, char *buf)1885{1886 struct tb_switch *sw = tb_to_switch(dev);1887 1888 return sysfs_emit(buf, "%u\n", sw->generation);1889}1890static DEVICE_ATTR_RO(generation);1891 1892static ssize_t key_show(struct device *dev, struct device_attribute *attr,1893 char *buf)1894{1895 struct tb_switch *sw = tb_to_switch(dev);1896 ssize_t ret;1897 1898 if (!mutex_trylock(&sw->tb->lock))1899 return restart_syscall();1900 1901 if (sw->key)1902 ret = sysfs_emit(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);1903 else1904 ret = sysfs_emit(buf, "\n");1905 1906 mutex_unlock(&sw->tb->lock);1907 return ret;1908}1909 1910static ssize_t key_store(struct device *dev, struct device_attribute *attr,1911 const char *buf, size_t count)1912{1913 struct tb_switch *sw = tb_to_switch(dev);1914 u8 key[TB_SWITCH_KEY_SIZE];1915 ssize_t ret = count;1916 bool clear = false;1917 1918 if (!strcmp(buf, "\n"))1919 clear = true;1920 else if (hex2bin(key, buf, sizeof(key)))1921 return -EINVAL;1922 1923 if (!mutex_trylock(&sw->tb->lock))1924 return restart_syscall();1925 1926 if (sw->authorized) {1927 ret = -EBUSY;1928 } else {1929 kfree(sw->key);1930 if (clear) {1931 sw->key = NULL;1932 } else {1933 sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);1934 if (!sw->key)1935 ret = -ENOMEM;1936 }1937 }1938 1939 mutex_unlock(&sw->tb->lock);1940 return ret;1941}1942static DEVICE_ATTR(key, 0600, key_show, key_store);1943 1944static ssize_t speed_show(struct device *dev, struct device_attribute *attr,1945 char *buf)1946{1947 struct tb_switch *sw = tb_to_switch(dev);1948 1949 return sysfs_emit(buf, "%u.0 Gb/s\n", sw->link_speed);1950}1951 1952/*1953 * Currently all lanes must run at the same speed but we expose here1954 * both directions to allow possible asymmetric links in the future.1955 */1956static DEVICE_ATTR(rx_speed, 0444, speed_show, NULL);1957static DEVICE_ATTR(tx_speed, 0444, speed_show, NULL);1958 1959static ssize_t rx_lanes_show(struct device *dev, struct device_attribute *attr,1960 char *buf)1961{1962 struct tb_switch *sw = tb_to_switch(dev);1963 unsigned int width;1964 1965 switch (sw->link_width) {1966 case TB_LINK_WIDTH_SINGLE:1967 case TB_LINK_WIDTH_ASYM_TX:1968 width = 1;1969 break;1970 case TB_LINK_WIDTH_DUAL:1971 width = 2;1972 break;1973 case TB_LINK_WIDTH_ASYM_RX:1974 width = 3;1975 break;1976 default:1977 WARN_ON_ONCE(1);1978 return -EINVAL;1979 }1980 1981 return sysfs_emit(buf, "%u\n", width);1982}1983static DEVICE_ATTR(rx_lanes, 0444, rx_lanes_show, NULL);1984 1985static ssize_t tx_lanes_show(struct device *dev, struct device_attribute *attr,1986 char *buf)1987{1988 struct tb_switch *sw = tb_to_switch(dev);1989 unsigned int width;1990 1991 switch (sw->link_width) {1992 case TB_LINK_WIDTH_SINGLE:1993 case TB_LINK_WIDTH_ASYM_RX:1994 width = 1;1995 break;1996 case TB_LINK_WIDTH_DUAL:1997 width = 2;1998 break;1999 case TB_LINK_WIDTH_ASYM_TX:2000 width = 3;2001 break;2002 default:2003 WARN_ON_ONCE(1);2004 return -EINVAL;2005 }2006 2007 return sysfs_emit(buf, "%u\n", width);2008}2009static DEVICE_ATTR(tx_lanes, 0444, tx_lanes_show, NULL);2010 2011static ssize_t nvm_authenticate_show(struct device *dev,2012 struct device_attribute *attr, char *buf)2013{2014 struct tb_switch *sw = tb_to_switch(dev);2015 u32 status;2016 2017 nvm_get_auth_status(sw, &status);2018 return sysfs_emit(buf, "%#x\n", status);2019}2020 2021static ssize_t nvm_authenticate_sysfs(struct device *dev, const char *buf,2022 bool disconnect)2023{2024 struct tb_switch *sw = tb_to_switch(dev);2025 int val, ret;2026 2027 pm_runtime_get_sync(&sw->dev);2028 2029 if (!mutex_trylock(&sw->tb->lock)) {2030 ret = restart_syscall();2031 goto exit_rpm;2032 }2033 2034 if (sw->no_nvm_upgrade) {2035 ret = -EOPNOTSUPP;2036 goto exit_unlock;2037 }2038 2039 /* If NVMem devices are not yet added */2040 if (!sw->nvm) {2041 ret = -EAGAIN;2042 goto exit_unlock;2043 }2044 2045 ret = kstrtoint(buf, 10, &val);2046 if (ret)2047 goto exit_unlock;2048 2049 /* Always clear the authentication status */2050 nvm_clear_auth_status(sw);2051 2052 if (val > 0) {2053 if (val == AUTHENTICATE_ONLY) {2054 if (disconnect)2055 ret = -EINVAL;2056 else2057 ret = nvm_authenticate(sw, true);2058 } else {2059 if (!sw->nvm->flushed) {2060 if (!sw->nvm->buf) {2061 ret = -EINVAL;2062 goto exit_unlock;2063 }2064 2065 ret = nvm_validate_and_write(sw);2066 if (ret || val == WRITE_ONLY)2067 goto exit_unlock;2068 }2069 if (val == WRITE_AND_AUTHENTICATE) {2070 if (disconnect)2071 ret = tb_lc_force_power(sw);2072 else2073 ret = nvm_authenticate(sw, false);2074 }2075 }2076 }2077 2078exit_unlock:2079 mutex_unlock(&sw->tb->lock);2080exit_rpm:2081 pm_runtime_mark_last_busy(&sw->dev);2082 pm_runtime_put_autosuspend(&sw->dev);2083 2084 return ret;2085}2086 2087static ssize_t nvm_authenticate_store(struct device *dev,2088 struct device_attribute *attr, const char *buf, size_t count)2089{2090 int ret = nvm_authenticate_sysfs(dev, buf, false);2091 if (ret)2092 return ret;2093 return count;2094}2095static DEVICE_ATTR_RW(nvm_authenticate);2096 2097static ssize_t nvm_authenticate_on_disconnect_show(struct device *dev,2098 struct device_attribute *attr, char *buf)2099{2100 return nvm_authenticate_show(dev, attr, buf);2101}2102 2103static ssize_t nvm_authenticate_on_disconnect_store(struct device *dev,2104 struct device_attribute *attr, const char *buf, size_t count)2105{2106 int ret;2107 2108 ret = nvm_authenticate_sysfs(dev, buf, true);2109 return ret ? ret : count;2110}2111static DEVICE_ATTR_RW(nvm_authenticate_on_disconnect);2112 2113static ssize_t nvm_version_show(struct device *dev,2114 struct device_attribute *attr, char *buf)2115{2116 struct tb_switch *sw = tb_to_switch(dev);2117 int ret;2118 2119 if (!mutex_trylock(&sw->tb->lock))2120 return restart_syscall();2121 2122 if (sw->safe_mode)2123 ret = -ENODATA;2124 else if (!sw->nvm)2125 ret = -EAGAIN;2126 else2127 ret = sysfs_emit(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);2128 2129 mutex_unlock(&sw->tb->lock);2130 2131 return ret;2132}2133static DEVICE_ATTR_RO(nvm_version);2134 2135static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,2136 char *buf)2137{2138 struct tb_switch *sw = tb_to_switch(dev);2139 2140 return sysfs_emit(buf, "%#x\n", sw->vendor);2141}2142static DEVICE_ATTR_RO(vendor);2143 2144static ssize_t2145vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)2146{2147 struct tb_switch *sw = tb_to_switch(dev);2148 2149 return sysfs_emit(buf, "%s\n", sw->vendor_name ?: "");2150}2151static DEVICE_ATTR_RO(vendor_name);2152 2153static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,2154 char *buf)2155{2156 struct tb_switch *sw = tb_to_switch(dev);2157 2158 return sysfs_emit(buf, "%pUb\n", sw->uuid);2159}2160static DEVICE_ATTR_RO(unique_id);2161 2162static struct attribute *switch_attrs[] = {2163 &dev_attr_authorized.attr,2164 &dev_attr_boot.attr,2165 &dev_attr_device.attr,2166 &dev_attr_device_name.attr,2167 &dev_attr_generation.attr,2168 &dev_attr_key.attr,2169 &dev_attr_nvm_authenticate.attr,2170 &dev_attr_nvm_authenticate_on_disconnect.attr,2171 &dev_attr_nvm_version.attr,2172 &dev_attr_rx_speed.attr,2173 &dev_attr_rx_lanes.attr,2174 &dev_attr_tx_speed.attr,2175 &dev_attr_tx_lanes.attr,2176 &dev_attr_vendor.attr,2177 &dev_attr_vendor_name.attr,2178 &dev_attr_unique_id.attr,2179 NULL,2180};2181 2182static umode_t switch_attr_is_visible(struct kobject *kobj,2183 struct attribute *attr, int n)2184{2185 struct device *dev = kobj_to_dev(kobj);2186 struct tb_switch *sw = tb_to_switch(dev);2187 2188 if (attr == &dev_attr_authorized.attr) {2189 if (sw->tb->security_level == TB_SECURITY_NOPCIE ||2190 sw->tb->security_level == TB_SECURITY_DPONLY)2191 return 0;2192 } else if (attr == &dev_attr_device.attr) {2193 if (!sw->device)2194 return 0;2195 } else if (attr == &dev_attr_device_name.attr) {2196 if (!sw->device_name)2197 return 0;2198 } else if (attr == &dev_attr_vendor.attr) {2199 if (!sw->vendor)2200 return 0;2201 } else if (attr == &dev_attr_vendor_name.attr) {2202 if (!sw->vendor_name)2203 return 0;2204 } else if (attr == &dev_attr_key.attr) {2205 if (tb_route(sw) &&2206 sw->tb->security_level == TB_SECURITY_SECURE &&2207 sw->security_level == TB_SECURITY_SECURE)2208 return attr->mode;2209 return 0;2210 } else if (attr == &dev_attr_rx_speed.attr ||2211 attr == &dev_attr_rx_lanes.attr ||2212 attr == &dev_attr_tx_speed.attr ||2213 attr == &dev_attr_tx_lanes.attr) {2214 if (tb_route(sw))2215 return attr->mode;2216 return 0;2217 } else if (attr == &dev_attr_nvm_authenticate.attr) {2218 if (nvm_upgradeable(sw))2219 return attr->mode;2220 return 0;2221 } else if (attr == &dev_attr_nvm_version.attr) {2222 if (nvm_readable(sw))2223 return attr->mode;2224 return 0;2225 } else if (attr == &dev_attr_boot.attr) {2226 if (tb_route(sw))2227 return attr->mode;2228 return 0;2229 } else if (attr == &dev_attr_nvm_authenticate_on_disconnect.attr) {2230 if (sw->quirks & QUIRK_FORCE_POWER_LINK_CONTROLLER)2231 return attr->mode;2232 return 0;2233 }2234 2235 return sw->safe_mode ? 0 : attr->mode;2236}2237 2238static const struct attribute_group switch_group = {2239 .is_visible = switch_attr_is_visible,2240 .attrs = switch_attrs,2241};2242 2243static const struct attribute_group *switch_groups[] = {2244 &switch_group,2245 NULL,2246};2247 2248static void tb_switch_release(struct device *dev)2249{2250 struct tb_switch *sw = tb_to_switch(dev);2251 struct tb_port *port;2252 2253 dma_port_free(sw->dma_port);2254 2255 tb_switch_for_each_port(sw, port) {2256 ida_destroy(&port->in_hopids);2257 ida_destroy(&port->out_hopids);2258 }2259 2260 kfree(sw->uuid);2261 kfree(sw->device_name);2262 kfree(sw->vendor_name);2263 kfree(sw->ports);2264 kfree(sw->drom);2265 kfree(sw->key);2266 kfree(sw);2267}2268 2269static int tb_switch_uevent(const struct device *dev, struct kobj_uevent_env *env)2270{2271 const struct tb_switch *sw = tb_to_switch(dev);2272 const char *type;2273 2274 if (tb_switch_is_usb4(sw)) {2275 if (add_uevent_var(env, "USB4_VERSION=%u.0",2276 usb4_switch_version(sw)))2277 return -ENOMEM;2278 }2279 2280 if (!tb_route(sw)) {2281 type = "host";2282 } else {2283 const struct tb_port *port;2284 bool hub = false;2285 2286 /* Device is hub if it has any downstream ports */2287 tb_switch_for_each_port(sw, port) {2288 if (!port->disabled && !tb_is_upstream_port(port) &&2289 tb_port_is_null(port)) {2290 hub = true;2291 break;2292 }2293 }2294 2295 type = hub ? "hub" : "device";2296 }2297 2298 if (add_uevent_var(env, "USB4_TYPE=%s", type))2299 return -ENOMEM;2300 return 0;2301}2302 2303/*2304 * Currently only need to provide the callbacks. Everything else is handled2305 * in the connection manager.2306 */2307static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)2308{2309 struct tb_switch *sw = tb_to_switch(dev);2310 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;2311 2312 if (cm_ops->runtime_suspend_switch)2313 return cm_ops->runtime_suspend_switch(sw);2314 2315 return 0;2316}2317 2318static int __maybe_unused tb_switch_runtime_resume(struct device *dev)2319{2320 struct tb_switch *sw = tb_to_switch(dev);2321 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;2322 2323 if (cm_ops->runtime_resume_switch)2324 return cm_ops->runtime_resume_switch(sw);2325 return 0;2326}2327 2328static const struct dev_pm_ops tb_switch_pm_ops = {2329 SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,2330 NULL)2331};2332 2333const struct device_type tb_switch_type = {2334 .name = "thunderbolt_device",2335 .release = tb_switch_release,2336 .uevent = tb_switch_uevent,2337 .pm = &tb_switch_pm_ops,2338};2339 2340static int tb_switch_get_generation(struct tb_switch *sw)2341{2342 if (tb_switch_is_usb4(sw))2343 return 4;2344 2345 if (sw->config.vendor_id == PCI_VENDOR_ID_INTEL) {2346 switch (sw->config.device_id) {2347 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:2348 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:2349 case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:2350 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:2351 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:2352 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:2353 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:2354 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:2355 return 1;2356 2357 case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:2358 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:2359 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:2360 return 2;2361 2362 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:2363 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:2364 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:2365 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:2366 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:2367 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:2368 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:2369 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:2370 case PCI_DEVICE_ID_INTEL_ICL_NHI0:2371 case PCI_DEVICE_ID_INTEL_ICL_NHI1:2372 return 3;2373 }2374 }2375 2376 /*2377 * For unknown switches assume generation to be 1 to be on the2378 * safe side.2379 */2380 tb_sw_warn(sw, "unsupported switch device id %#x\n",2381 sw->config.device_id);2382 return 1;2383}2384 2385static bool tb_switch_exceeds_max_depth(const struct tb_switch *sw, int depth)2386{2387 int max_depth;2388 2389 if (tb_switch_is_usb4(sw) ||2390 (sw->tb->root_switch && tb_switch_is_usb4(sw->tb->root_switch)))2391 max_depth = USB4_SWITCH_MAX_DEPTH;2392 else2393 max_depth = TB_SWITCH_MAX_DEPTH;2394 2395 return depth > max_depth;2396}2397 2398/**2399 * tb_switch_alloc() - allocate a switch2400 * @tb: Pointer to the owning domain2401 * @parent: Parent device for this switch2402 * @route: Route string for this switch2403 *2404 * Allocates and initializes a switch. Will not upload configuration to2405 * the switch. For that you need to call tb_switch_configure()2406 * separately. The returned switch should be released by calling2407 * tb_switch_put().2408 *2409 * Return: Pointer to the allocated switch or ERR_PTR() in case of2410 * failure.2411 */2412struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,2413 u64 route)2414{2415 struct tb_switch *sw;2416 int upstream_port;2417 int i, ret, depth;2418 2419 /* Unlock the downstream port so we can access the switch below */2420 if (route) {2421 struct tb_switch *parent_sw = tb_to_switch(parent);2422 struct tb_port *down;2423 2424 down = tb_port_at(route, parent_sw);2425 tb_port_unlock(down);2426 }2427 2428 depth = tb_route_length(route);2429 2430 upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);2431 if (upstream_port < 0)2432 return ERR_PTR(upstream_port);2433 2434 sw = kzalloc(sizeof(*sw), GFP_KERNEL);2435 if (!sw)2436 return ERR_PTR(-ENOMEM);2437 2438 sw->tb = tb;2439 ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);2440 if (ret)2441 goto err_free_sw_ports;2442 2443 sw->generation = tb_switch_get_generation(sw);2444 2445 tb_dbg(tb, "current switch config:\n");2446 tb_dump_switch(tb, sw);2447 2448 /* configure switch */2449 sw->config.upstream_port_number = upstream_port;2450 sw->config.depth = depth;2451 sw->config.route_hi = upper_32_bits(route);2452 sw->config.route_lo = lower_32_bits(route);2453 sw->config.enabled = 0;2454 2455 /* Make sure we do not exceed maximum topology limit */2456 if (tb_switch_exceeds_max_depth(sw, depth)) {2457 ret = -EADDRNOTAVAIL;2458 goto err_free_sw_ports;2459 }2460 2461 /* initialize ports */2462 sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),2463 GFP_KERNEL);2464 if (!sw->ports) {2465 ret = -ENOMEM;2466 goto err_free_sw_ports;2467 }2468 2469 for (i = 0; i <= sw->config.max_port_number; i++) {2470 /* minimum setup for tb_find_cap and tb_drom_read to work */2471 sw->ports[i].sw = sw;2472 sw->ports[i].port = i;2473 2474 /* Control port does not need HopID allocation */2475 if (i) {2476 ida_init(&sw->ports[i].in_hopids);2477 ida_init(&sw->ports[i].out_hopids);2478 }2479 }2480 2481 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);2482 if (ret > 0)2483 sw->cap_plug_events = ret;2484 2485 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_TIME2);2486 if (ret > 0)2487 sw->cap_vsec_tmu = ret;2488 2489 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);2490 if (ret > 0)2491 sw->cap_lc = ret;2492 2493 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_CP_LP);2494 if (ret > 0)2495 sw->cap_lp = ret;2496 2497 /* Root switch is always authorized */2498 if (!route)2499 sw->authorized = true;2500 2501 device_initialize(&sw->dev);2502 sw->dev.parent = parent;2503 sw->dev.bus = &tb_bus_type;2504 sw->dev.type = &tb_switch_type;2505 sw->dev.groups = switch_groups;2506 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));2507 2508 return sw;2509 2510err_free_sw_ports:2511 kfree(sw->ports);2512 kfree(sw);2513 2514 return ERR_PTR(ret);2515}2516 2517/**2518 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode2519 * @tb: Pointer to the owning domain2520 * @parent: Parent device for this switch2521 * @route: Route string for this switch2522 *2523 * This creates a switch in safe mode. This means the switch pretty much2524 * lacks all capabilities except DMA configuration port before it is2525 * flashed with a valid NVM firmware.2526 *2527 * The returned switch must be released by calling tb_switch_put().2528 *2529 * Return: Pointer to the allocated switch or ERR_PTR() in case of failure2530 */2531struct tb_switch *2532tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)2533{2534 struct tb_switch *sw;2535 2536 sw = kzalloc(sizeof(*sw), GFP_KERNEL);2537 if (!sw)2538 return ERR_PTR(-ENOMEM);2539 2540 sw->tb = tb;2541 sw->config.depth = tb_route_length(route);2542 sw->config.route_hi = upper_32_bits(route);2543 sw->config.route_lo = lower_32_bits(route);2544 sw->safe_mode = true;2545 2546 device_initialize(&sw->dev);2547 sw->dev.parent = parent;2548 sw->dev.bus = &tb_bus_type;2549 sw->dev.type = &tb_switch_type;2550 sw->dev.groups = switch_groups;2551 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));2552 2553 return sw;2554}2555 2556/**2557 * tb_switch_configure() - Uploads configuration to the switch2558 * @sw: Switch to configure2559 *2560 * Call this function before the switch is added to the system. It will2561 * upload configuration to the switch and makes it available for the2562 * connection manager to use. Can be called to the switch again after2563 * resume from low power states to re-initialize it.2564 *2565 * Return: %0 in case of success and negative errno in case of failure2566 */2567int tb_switch_configure(struct tb_switch *sw)2568{2569 struct tb *tb = sw->tb;2570 u64 route;2571 int ret;2572 2573 route = tb_route(sw);2574 2575 tb_dbg(tb, "%s Switch at %#llx (depth: %d, up port: %d)\n",2576 sw->config.enabled ? "restoring" : "initializing", route,2577 tb_route_length(route), sw->config.upstream_port_number);2578 2579 sw->config.enabled = 1;2580 2581 if (tb_switch_is_usb4(sw)) {2582 /*2583 * For USB4 devices, we need to program the CM version2584 * accordingly so that it knows to expose all the2585 * additional capabilities. Program it according to USB42586 * version to avoid changing existing (v1) routers behaviour.2587 */2588 if (usb4_switch_version(sw) < 2)2589 sw->config.cmuv = ROUTER_CS_4_CMUV_V1;2590 else2591 sw->config.cmuv = ROUTER_CS_4_CMUV_V2;2592 sw->config.plug_events_delay = 0xa;2593 2594 /* Enumerate the switch */2595 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,2596 ROUTER_CS_1, 4);2597 if (ret)2598 return ret;2599 2600 ret = usb4_switch_setup(sw);2601 } else {2602 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)2603 tb_sw_warn(sw, "unknown switch vendor id %#x\n",2604 sw->config.vendor_id);2605 2606 if (!sw->cap_plug_events) {2607 tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");2608 return -ENODEV;2609 }2610 2611 /* Enumerate the switch */2612 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,2613 ROUTER_CS_1, 3);2614 }2615 if (ret)2616 return ret;2617 2618 return tb_plug_events_active(sw, true);2619}2620 2621/**2622 * tb_switch_configuration_valid() - Set the tunneling configuration to be valid2623 * @sw: Router to configure2624 *2625 * Needs to be called before any tunnels can be setup through the2626 * router. Can be called to any router.2627 *2628 * Returns %0 in success and negative errno otherwise.2629 */2630int tb_switch_configuration_valid(struct tb_switch *sw)2631{2632 if (tb_switch_is_usb4(sw))2633 return usb4_switch_configuration_valid(sw);2634 return 0;2635}2636 2637static int tb_switch_set_uuid(struct tb_switch *sw)2638{2639 bool uid = false;2640 u32 uuid[4];2641 int ret;2642 2643 if (sw->uuid)2644 return 0;2645 2646 if (tb_switch_is_usb4(sw)) {2647 ret = usb4_switch_read_uid(sw, &sw->uid);2648 if (ret)2649 return ret;2650 uid = true;2651 } else {2652 /*2653 * The newer controllers include fused UUID as part of2654 * link controller specific registers2655 */2656 ret = tb_lc_read_uuid(sw, uuid);2657 if (ret) {2658 if (ret != -EINVAL)2659 return ret;2660 uid = true;2661 }2662 }2663 2664 if (uid) {2665 /*2666 * ICM generates UUID based on UID and fills the upper2667 * two words with ones. This is not strictly following2668 * UUID format but we want to be compatible with it so2669 * we do the same here.2670 */2671 uuid[0] = sw->uid & 0xffffffff;2672 uuid[1] = (sw->uid >> 32) & 0xffffffff;2673 uuid[2] = 0xffffffff;2674 uuid[3] = 0xffffffff;2675 }2676 2677 sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);2678 if (!sw->uuid)2679 return -ENOMEM;2680 return 0;2681}2682 2683static int tb_switch_add_dma_port(struct tb_switch *sw)2684{2685 u32 status;2686 int ret;2687 2688 switch (sw->generation) {2689 case 2:2690 /* Only root switch can be upgraded */2691 if (tb_route(sw))2692 return 0;2693 2694 fallthrough;2695 case 3:2696 case 4:2697 ret = tb_switch_set_uuid(sw);2698 if (ret)2699 return ret;2700 break;2701 2702 default:2703 /*2704 * DMA port is the only thing available when the switch2705 * is in safe mode.2706 */2707 if (!sw->safe_mode)2708 return 0;2709 break;2710 }2711 2712 if (sw->no_nvm_upgrade)2713 return 0;2714 2715 if (tb_switch_is_usb4(sw)) {2716 ret = usb4_switch_nvm_authenticate_status(sw, &status);2717 if (ret)2718 return ret;2719 2720 if (status) {2721 tb_sw_info(sw, "switch flash authentication failed\n");2722 nvm_set_auth_status(sw, status);2723 }2724 2725 return 0;2726 }2727 2728 /* Root switch DMA port requires running firmware */2729 if (!tb_route(sw) && !tb_switch_is_icm(sw))2730 return 0;2731 2732 sw->dma_port = dma_port_alloc(sw);2733 if (!sw->dma_port)2734 return 0;2735 2736 /*2737 * If there is status already set then authentication failed2738 * when the dma_port_flash_update_auth() returned. Power cycling2739 * is not needed (it was done already) so only thing we do here2740 * is to unblock runtime PM of the root port.2741 */2742 nvm_get_auth_status(sw, &status);2743 if (status) {2744 if (!tb_route(sw))2745 nvm_authenticate_complete_dma_port(sw);2746 return 0;2747 }2748 2749 /*2750 * Check status of the previous flash authentication. If there2751 * is one we need to power cycle the switch in any case to make2752 * it functional again.2753 */2754 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);2755 if (ret <= 0)2756 return ret;2757 2758 /* Now we can allow root port to suspend again */2759 if (!tb_route(sw))2760 nvm_authenticate_complete_dma_port(sw);2761 2762 if (status) {2763 tb_sw_info(sw, "switch flash authentication failed\n");2764 nvm_set_auth_status(sw, status);2765 }2766 2767 tb_sw_info(sw, "power cycling the switch now\n");2768 dma_port_power_cycle(sw->dma_port);2769 2770 /*2771 * We return error here which causes the switch adding failure.2772 * It should appear back after power cycle is complete.2773 */2774 return -ESHUTDOWN;2775}2776 2777static void tb_switch_default_link_ports(struct tb_switch *sw)2778{2779 int i;2780 2781 for (i = 1; i <= sw->config.max_port_number; i++) {2782 struct tb_port *port = &sw->ports[i];2783 struct tb_port *subordinate;2784 2785 if (!tb_port_is_null(port))2786 continue;2787 2788 /* Check for the subordinate port */2789 if (i == sw->config.max_port_number ||2790 !tb_port_is_null(&sw->ports[i + 1]))2791 continue;2792 2793 /* Link them if not already done so (by DROM) */2794 subordinate = &sw->ports[i + 1];2795 if (!port->dual_link_port && !subordinate->dual_link_port) {2796 port->link_nr = 0;2797 port->dual_link_port = subordinate;2798 subordinate->link_nr = 1;2799 subordinate->dual_link_port = port;2800 2801 tb_sw_dbg(sw, "linked ports %d <-> %d\n",2802 port->port, subordinate->port);2803 }2804 }2805}2806 2807static bool tb_switch_lane_bonding_possible(struct tb_switch *sw)2808{2809 const struct tb_port *up = tb_upstream_port(sw);2810 2811 if (!up->dual_link_port || !up->dual_link_port->remote)2812 return false;2813 2814 if (tb_switch_is_usb4(sw))2815 return usb4_switch_lane_bonding_possible(sw);2816 return tb_lc_lane_bonding_possible(sw);2817}2818 2819static int tb_switch_update_link_attributes(struct tb_switch *sw)2820{2821 struct tb_port *up;2822 bool change = false;2823 int ret;2824 2825 if (!tb_route(sw) || tb_switch_is_icm(sw))2826 return 0;2827 2828 up = tb_upstream_port(sw);2829 2830 ret = tb_port_get_link_speed(up);2831 if (ret < 0)2832 return ret;2833 if (sw->link_speed != ret)2834 change = true;2835 sw->link_speed = ret;2836 2837 ret = tb_port_get_link_width(up);2838 if (ret < 0)2839 return ret;2840 if (sw->link_width != ret)2841 change = true;2842 sw->link_width = ret;2843 2844 /* Notify userspace that there is possible link attribute change */2845 if (device_is_registered(&sw->dev) && change)2846 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);2847 2848 return 0;2849}2850 2851/* Must be called after tb_switch_update_link_attributes() */2852static void tb_switch_link_init(struct tb_switch *sw)2853{2854 struct tb_port *up, *down;2855 bool bonded;2856 2857 if (!tb_route(sw) || tb_switch_is_icm(sw))2858 return;2859 2860 tb_sw_dbg(sw, "current link speed %u.0 Gb/s\n", sw->link_speed);2861 tb_sw_dbg(sw, "current link width %s\n", tb_width_name(sw->link_width));2862 2863 bonded = sw->link_width >= TB_LINK_WIDTH_DUAL;2864 2865 /*2866 * Gen 4 links come up as bonded so update the port structures2867 * accordingly.2868 */2869 up = tb_upstream_port(sw);2870 down = tb_switch_downstream_port(sw);2871 2872 up->bonded = bonded;2873 if (up->dual_link_port)2874 up->dual_link_port->bonded = bonded;2875 tb_port_update_credits(up);2876 2877 down->bonded = bonded;2878 if (down->dual_link_port)2879 down->dual_link_port->bonded = bonded;2880 tb_port_update_credits(down);2881 2882 if (tb_port_get_link_generation(up) < 4)2883 return;2884 2885 /*2886 * Set the Gen 4 preferred link width. This is what the router2887 * prefers when the link is brought up. If the router does not2888 * support asymmetric link configuration, this also will be set2889 * to TB_LINK_WIDTH_DUAL.2890 */2891 sw->preferred_link_width = sw->link_width;2892 tb_sw_dbg(sw, "preferred link width %s\n",2893 tb_width_name(sw->preferred_link_width));2894}2895 2896/**2897 * tb_switch_lane_bonding_enable() - Enable lane bonding2898 * @sw: Switch to enable lane bonding2899 *2900 * Connection manager can call this function to enable lane bonding of a2901 * switch. If conditions are correct and both switches support the feature,2902 * lanes are bonded. It is safe to call this to any switch.2903 */2904static int tb_switch_lane_bonding_enable(struct tb_switch *sw)2905{2906 struct tb_port *up, *down;2907 unsigned int width;2908 int ret;2909 2910 if (!tb_switch_lane_bonding_possible(sw))2911 return 0;2912 2913 up = tb_upstream_port(sw);2914 down = tb_switch_downstream_port(sw);2915 2916 if (!tb_port_width_supported(up, TB_LINK_WIDTH_DUAL) ||2917 !tb_port_width_supported(down, TB_LINK_WIDTH_DUAL))2918 return 0;2919 2920 /*2921 * Both lanes need to be in CL0. Here we assume lane 0 already be in2922 * CL0 and check just for lane 1.2923 */2924 if (tb_wait_for_port(down->dual_link_port, false) <= 0)2925 return -ENOTCONN;2926 2927 ret = tb_port_lane_bonding_enable(up);2928 if (ret) {2929 tb_port_warn(up, "failed to enable lane bonding\n");2930 return ret;2931 }2932 2933 ret = tb_port_lane_bonding_enable(down);2934 if (ret) {2935 tb_port_warn(down, "failed to enable lane bonding\n");2936 tb_port_lane_bonding_disable(up);2937 return ret;2938 }2939 2940 /* Any of the widths are all bonded */2941 width = TB_LINK_WIDTH_DUAL | TB_LINK_WIDTH_ASYM_TX |2942 TB_LINK_WIDTH_ASYM_RX;2943 2944 return tb_port_wait_for_link_width(down, width, 100);2945}2946 2947/**2948 * tb_switch_lane_bonding_disable() - Disable lane bonding2949 * @sw: Switch whose lane bonding to disable2950 *2951 * Disables lane bonding between @sw and parent. This can be called even2952 * if lanes were not bonded originally.2953 */2954static int tb_switch_lane_bonding_disable(struct tb_switch *sw)2955{2956 struct tb_port *up, *down;2957 int ret;2958 2959 up = tb_upstream_port(sw);2960 if (!up->bonded)2961 return 0;2962 2963 /*2964 * If the link is Gen 4 there is no way to switch the link to2965 * two single lane links so avoid that here. Also don't bother2966 * if the link is not up anymore (sw is unplugged).2967 */2968 ret = tb_port_get_link_generation(up);2969 if (ret < 0)2970 return ret;2971 if (ret >= 4)2972 return -EOPNOTSUPP;2973 2974 down = tb_switch_downstream_port(sw);2975 tb_port_lane_bonding_disable(up);2976 tb_port_lane_bonding_disable(down);2977 2978 /*2979 * It is fine if we get other errors as the router might have2980 * been unplugged.2981 */2982 return tb_port_wait_for_link_width(down, TB_LINK_WIDTH_SINGLE, 100);2983}2984 2985/* Note updating sw->link_width done in tb_switch_update_link_attributes() */2986static int tb_switch_asym_enable(struct tb_switch *sw, enum tb_link_width width)2987{2988 struct tb_port *up, *down, *port;2989 enum tb_link_width down_width;2990 int ret;2991 2992 up = tb_upstream_port(sw);2993 down = tb_switch_downstream_port(sw);2994 2995 if (width == TB_LINK_WIDTH_ASYM_TX) {2996 down_width = TB_LINK_WIDTH_ASYM_RX;2997 port = down;2998 } else {2999 down_width = TB_LINK_WIDTH_ASYM_TX;3000 port = up;3001 }3002 3003 ret = tb_port_set_link_width(up, width);3004 if (ret)3005 return ret;3006 3007 ret = tb_port_set_link_width(down, down_width);3008 if (ret)3009 return ret;3010 3011 /*3012 * Initiate the change in the router that one of its TX lanes is3013 * changing to RX but do so only if there is an actual change.3014 */3015 if (sw->link_width != width) {3016 ret = usb4_port_asym_start(port);3017 if (ret)3018 return ret;3019 3020 ret = tb_port_wait_for_link_width(up, width, 100);3021 if (ret)3022 return ret;3023 }3024 3025 return 0;3026}3027 3028/* Note updating sw->link_width done in tb_switch_update_link_attributes() */3029static int tb_switch_asym_disable(struct tb_switch *sw)3030{3031 struct tb_port *up, *down;3032 int ret;3033 3034 up = tb_upstream_port(sw);3035 down = tb_switch_downstream_port(sw);3036 3037 ret = tb_port_set_link_width(up, TB_LINK_WIDTH_DUAL);3038 if (ret)3039 return ret;3040 3041 ret = tb_port_set_link_width(down, TB_LINK_WIDTH_DUAL);3042 if (ret)3043 return ret;3044 3045 /*3046 * Initiate the change in the router that has three TX lanes and3047 * is changing one of its TX lanes to RX but only if there is a3048 * change in the link width.3049 */3050 if (sw->link_width > TB_LINK_WIDTH_DUAL) {3051 if (sw->link_width == TB_LINK_WIDTH_ASYM_TX)3052 ret = usb4_port_asym_start(up);3053 else3054 ret = usb4_port_asym_start(down);3055 if (ret)3056 return ret;3057 3058 ret = tb_port_wait_for_link_width(up, TB_LINK_WIDTH_DUAL, 100);3059 if (ret)3060 return ret;3061 }3062 3063 return 0;3064}3065 3066/**3067 * tb_switch_set_link_width() - Configure router link width3068 * @sw: Router to configure3069 * @width: The new link width3070 *3071 * Set device router link width to @width from router upstream port3072 * perspective. Supports also asymmetric links if the routers boths side3073 * of the link supports it.3074 *3075 * Does nothing for host router.3076 *3077 * Returns %0 in case of success, negative errno otherwise.3078 */3079int tb_switch_set_link_width(struct tb_switch *sw, enum tb_link_width width)3080{3081 struct tb_port *up, *down;3082 int ret = 0;3083 3084 if (!tb_route(sw))3085 return 0;3086 3087 up = tb_upstream_port(sw);3088 down = tb_switch_downstream_port(sw);3089 3090 switch (width) {3091 case TB_LINK_WIDTH_SINGLE:3092 ret = tb_switch_lane_bonding_disable(sw);3093 break;3094 3095 case TB_LINK_WIDTH_DUAL:3096 if (sw->link_width == TB_LINK_WIDTH_ASYM_TX ||3097 sw->link_width == TB_LINK_WIDTH_ASYM_RX) {3098 ret = tb_switch_asym_disable(sw);3099 if (ret)3100 break;3101 }3102 ret = tb_switch_lane_bonding_enable(sw);3103 break;3104 3105 case TB_LINK_WIDTH_ASYM_TX:3106 case TB_LINK_WIDTH_ASYM_RX:3107 ret = tb_switch_asym_enable(sw, width);3108 break;3109 }3110 3111 switch (ret) {3112 case 0:3113 break;3114 3115 case -ETIMEDOUT:3116 tb_sw_warn(sw, "timeout changing link width\n");3117 return ret;3118 3119 case -ENOTCONN:3120 case -EOPNOTSUPP:3121 case -ENODEV:3122 return ret;3123 3124 default:3125 tb_sw_dbg(sw, "failed to change link width: %d\n", ret);3126 return ret;3127 }3128 3129 tb_port_update_credits(down);3130 tb_port_update_credits(up);3131 3132 tb_switch_update_link_attributes(sw);3133 3134 tb_sw_dbg(sw, "link width set to %s\n", tb_width_name(width));3135 return ret;3136}3137 3138/**3139 * tb_switch_configure_link() - Set link configured3140 * @sw: Switch whose link is configured3141 *3142 * Sets the link upstream from @sw configured (from both ends) so that3143 * it will not be disconnected when the domain exits sleep. Can be3144 * called for any switch.3145 *3146 * It is recommended that this is called after lane bonding is enabled.3147 *3148 * Returns %0 on success and negative errno in case of error.3149 */3150int tb_switch_configure_link(struct tb_switch *sw)3151{3152 struct tb_port *up, *down;3153 int ret;3154 3155 if (!tb_route(sw) || tb_switch_is_icm(sw))3156 return 0;3157 3158 up = tb_upstream_port(sw);3159 if (tb_switch_is_usb4(up->sw))3160 ret = usb4_port_configure(up);3161 else3162 ret = tb_lc_configure_port(up);3163 if (ret)3164 return ret;3165 3166 down = up->remote;3167 if (tb_switch_is_usb4(down->sw))3168 return usb4_port_configure(down);3169 return tb_lc_configure_port(down);3170}3171 3172/**3173 * tb_switch_unconfigure_link() - Unconfigure link3174 * @sw: Switch whose link is unconfigured3175 *3176 * Sets the link unconfigured so the @sw will be disconnected if the3177 * domain exists sleep.3178 */3179void tb_switch_unconfigure_link(struct tb_switch *sw)3180{3181 struct tb_port *up, *down;3182 3183 if (!tb_route(sw) || tb_switch_is_icm(sw))3184 return;3185 3186 /*3187 * Unconfigure downstream port so that wake-on-connect can be3188 * configured after router unplug. No need to unconfigure upstream port3189 * since its router is unplugged.3190 */3191 up = tb_upstream_port(sw);3192 down = up->remote;3193 if (tb_switch_is_usb4(down->sw))3194 usb4_port_unconfigure(down);3195 else3196 tb_lc_unconfigure_port(down);3197 3198 if (sw->is_unplugged)3199 return;3200 3201 up = tb_upstream_port(sw);3202 if (tb_switch_is_usb4(up->sw))3203 usb4_port_unconfigure(up);3204 else3205 tb_lc_unconfigure_port(up);3206}3207 3208static void tb_switch_credits_init(struct tb_switch *sw)3209{3210 if (tb_switch_is_icm(sw))3211 return;3212 if (!tb_switch_is_usb4(sw))3213 return;3214 if (usb4_switch_credits_init(sw))3215 tb_sw_info(sw, "failed to determine preferred buffer allocation, using defaults\n");3216}3217 3218static int tb_switch_port_hotplug_enable(struct tb_switch *sw)3219{3220 struct tb_port *port;3221 3222 if (tb_switch_is_icm(sw))3223 return 0;3224 3225 tb_switch_for_each_port(sw, port) {3226 int res;3227 3228 if (!port->cap_usb4)3229 continue;3230 3231 res = usb4_port_hotplug_enable(port);3232 if (res)3233 return res;3234 }3235 return 0;3236}3237 3238/**3239 * tb_switch_add() - Add a switch to the domain3240 * @sw: Switch to add3241 *3242 * This is the last step in adding switch to the domain. It will read3243 * identification information from DROM and initializes ports so that3244 * they can be used to connect other switches. The switch will be3245 * exposed to the userspace when this function successfully returns. To3246 * remove and release the switch, call tb_switch_remove().3247 *3248 * Return: %0 in case of success and negative errno in case of failure3249 */3250int tb_switch_add(struct tb_switch *sw)3251{3252 int i, ret;3253 3254 /*3255 * Initialize DMA control port now before we read DROM. Recent3256 * host controllers have more complete DROM on NVM that includes3257 * vendor and model identification strings which we then expose3258 * to the userspace. NVM can be accessed through DMA3259 * configuration based mailbox.3260 */3261 ret = tb_switch_add_dma_port(sw);3262 if (ret) {3263 dev_err(&sw->dev, "failed to add DMA port\n");3264 return ret;3265 }3266 3267 if (!sw->safe_mode) {3268 tb_switch_credits_init(sw);3269 3270 /* read drom */3271 ret = tb_drom_read(sw);3272 if (ret)3273 dev_warn(&sw->dev, "reading DROM failed: %d\n", ret);3274 tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);3275 3276 ret = tb_switch_set_uuid(sw);3277 if (ret) {3278 dev_err(&sw->dev, "failed to set UUID\n");3279 return ret;3280 }3281 3282 for (i = 0; i <= sw->config.max_port_number; i++) {3283 if (sw->ports[i].disabled) {3284 tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");3285 continue;3286 }3287 ret = tb_init_port(&sw->ports[i]);3288 if (ret) {3289 dev_err(&sw->dev, "failed to initialize port %d\n", i);3290 return ret;3291 }3292 }3293 3294 tb_check_quirks(sw);3295 3296 tb_switch_default_link_ports(sw);3297 3298 ret = tb_switch_update_link_attributes(sw);3299 if (ret)3300 return ret;3301 3302 tb_switch_link_init(sw);3303 3304 ret = tb_switch_clx_init(sw);3305 if (ret)3306 return ret;3307 3308 ret = tb_switch_tmu_init(sw);3309 if (ret)3310 return ret;3311 }3312 3313 ret = tb_switch_port_hotplug_enable(sw);3314 if (ret)3315 return ret;3316 3317 ret = device_add(&sw->dev);3318 if (ret) {3319 dev_err(&sw->dev, "failed to add device: %d\n", ret);3320 return ret;3321 }3322 3323 if (tb_route(sw)) {3324 dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",3325 sw->vendor, sw->device);3326 if (sw->vendor_name && sw->device_name)3327 dev_info(&sw->dev, "%s %s\n", sw->vendor_name,3328 sw->device_name);3329 }3330 3331 ret = usb4_switch_add_ports(sw);3332 if (ret) {3333 dev_err(&sw->dev, "failed to add USB4 ports\n");3334 goto err_del;3335 }3336 3337 ret = tb_switch_nvm_add(sw);3338 if (ret) {3339 dev_err(&sw->dev, "failed to add NVM devices\n");3340 goto err_ports;3341 }3342 3343 /*3344 * Thunderbolt routers do not generate wakeups themselves but3345 * they forward wakeups from tunneled protocols, so enable it3346 * here.3347 */3348 device_init_wakeup(&sw->dev, true);3349 3350 pm_runtime_set_active(&sw->dev);3351 if (sw->rpm) {3352 pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);3353 pm_runtime_use_autosuspend(&sw->dev);3354 pm_runtime_mark_last_busy(&sw->dev);3355 pm_runtime_enable(&sw->dev);3356 pm_request_autosuspend(&sw->dev);3357 }3358 3359 tb_switch_debugfs_init(sw);3360 return 0;3361 3362err_ports:3363 usb4_switch_remove_ports(sw);3364err_del:3365 device_del(&sw->dev);3366 3367 return ret;3368}3369 3370/**3371 * tb_switch_remove() - Remove and release a switch3372 * @sw: Switch to remove3373 *3374 * This will remove the switch from the domain and release it after last3375 * reference count drops to zero. If there are switches connected below3376 * this switch, they will be removed as well.3377 */3378void tb_switch_remove(struct tb_switch *sw)3379{3380 struct tb_port *port;3381 3382 tb_switch_debugfs_remove(sw);3383 3384 if (sw->rpm) {3385 pm_runtime_get_sync(&sw->dev);3386 pm_runtime_disable(&sw->dev);3387 }3388 3389 /* port 0 is the switch itself and never has a remote */3390 tb_switch_for_each_port(sw, port) {3391 if (tb_port_has_remote(port)) {3392 tb_switch_remove(port->remote->sw);3393 port->remote = NULL;3394 } else if (port->xdomain) {3395 port->xdomain->is_unplugged = true;3396 tb_xdomain_remove(port->xdomain);3397 port->xdomain = NULL;3398 }3399 3400 /* Remove any downstream retimers */3401 tb_retimer_remove_all(port);3402 }3403 3404 if (!sw->is_unplugged)3405 tb_plug_events_active(sw, false);3406 3407 tb_switch_nvm_remove(sw);3408 usb4_switch_remove_ports(sw);3409 3410 if (tb_route(sw))3411 dev_info(&sw->dev, "device disconnected\n");3412 device_unregister(&sw->dev);3413}3414 3415/**3416 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches3417 * @sw: Router to mark unplugged3418 */3419void tb_sw_set_unplugged(struct tb_switch *sw)3420{3421 struct tb_port *port;3422 3423 if (sw == sw->tb->root_switch) {3424 tb_sw_WARN(sw, "cannot unplug root switch\n");3425 return;3426 }3427 if (sw->is_unplugged) {3428 tb_sw_WARN(sw, "is_unplugged already set\n");3429 return;3430 }3431 sw->is_unplugged = true;3432 tb_switch_for_each_port(sw, port) {3433 if (tb_port_has_remote(port))3434 tb_sw_set_unplugged(port->remote->sw);3435 else if (port->xdomain)3436 port->xdomain->is_unplugged = true;3437 }3438}3439 3440static int tb_switch_set_wake(struct tb_switch *sw, unsigned int flags)3441{3442 if (flags)3443 tb_sw_dbg(sw, "enabling wakeup: %#x\n", flags);3444 else3445 tb_sw_dbg(sw, "disabling wakeup\n");3446 3447 if (tb_switch_is_usb4(sw))3448 return usb4_switch_set_wake(sw, flags);3449 return tb_lc_set_wake(sw, flags);3450}3451 3452static void tb_switch_check_wakes(struct tb_switch *sw)3453{3454 if (device_may_wakeup(&sw->dev)) {3455 if (tb_switch_is_usb4(sw))3456 usb4_switch_check_wakes(sw);3457 }3458}3459 3460/**3461 * tb_switch_resume() - Resume a switch after sleep3462 * @sw: Switch to resume3463 * @runtime: Is this resume from runtime suspend or system sleep3464 *3465 * Resumes and re-enumerates router (and all its children), if still plugged3466 * after suspend. Don't enumerate device router whose UID was changed during3467 * suspend. If this is resume from system sleep, notifies PM core about the3468 * wakes occurred during suspend. Disables all wakes, except USB4 wake of3469 * upstream port for USB4 routers that shall be always enabled.3470 */3471int tb_switch_resume(struct tb_switch *sw, bool runtime)3472{3473 struct tb_port *port;3474 int err;3475 3476 tb_sw_dbg(sw, "resuming switch\n");3477 3478 /*3479 * Check for UID of the connected switches except for root3480 * switch which we assume cannot be removed.3481 */3482 if (tb_route(sw)) {3483 u64 uid;3484 3485 /*3486 * Check first that we can still read the switch config3487 * space. It may be that there is now another domain3488 * connected.3489 */3490 err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));3491 if (err < 0) {3492 tb_sw_info(sw, "switch not present anymore\n");3493 return err;3494 }3495 3496 /* We don't have any way to confirm this was the same device */3497 if (!sw->uid)3498 return -ENODEV;3499 3500 if (tb_switch_is_usb4(sw))3501 err = usb4_switch_read_uid(sw, &uid);3502 else3503 err = tb_drom_read_uid_only(sw, &uid);3504 if (err) {3505 tb_sw_warn(sw, "uid read failed\n");3506 return err;3507 }3508 if (sw->uid != uid) {3509 tb_sw_info(sw,3510 "changed while suspended (uid %#llx -> %#llx)\n",3511 sw->uid, uid);3512 return -ENODEV;3513 }3514 }3515 3516 err = tb_switch_configure(sw);3517 if (err)3518 return err;3519 3520 if (!runtime)3521 tb_switch_check_wakes(sw);3522 3523 /* Disable wakes */3524 tb_switch_set_wake(sw, 0);3525 3526 err = tb_switch_tmu_init(sw);3527 if (err)3528 return err;3529 3530 /* check for surviving downstream switches */3531 tb_switch_for_each_port(sw, port) {3532 if (!tb_port_is_null(port))3533 continue;3534 3535 if (!tb_port_resume(port))3536 continue;3537 3538 if (tb_wait_for_port(port, true) <= 0) {3539 tb_port_warn(port,3540 "lost during suspend, disconnecting\n");3541 if (tb_port_has_remote(port))3542 tb_sw_set_unplugged(port->remote->sw);3543 else if (port->xdomain)3544 port->xdomain->is_unplugged = true;3545 } else {3546 /*3547 * Always unlock the port so the downstream3548 * switch/domain is accessible.3549 */3550 if (tb_port_unlock(port))3551 tb_port_warn(port, "failed to unlock port\n");3552 if (port->remote &&3553 tb_switch_resume(port->remote->sw, runtime)) {3554 tb_port_warn(port,3555 "lost during suspend, disconnecting\n");3556 tb_sw_set_unplugged(port->remote->sw);3557 }3558 }3559 }3560 return 0;3561}3562 3563/**3564 * tb_switch_suspend() - Put a switch to sleep3565 * @sw: Switch to suspend3566 * @runtime: Is this runtime suspend or system sleep3567 *3568 * Suspends router and all its children. Enables wakes according to3569 * value of @runtime and then sets sleep bit for the router. If @sw is3570 * host router the domain is ready to go to sleep once this function3571 * returns.3572 */3573void tb_switch_suspend(struct tb_switch *sw, bool runtime)3574{3575 unsigned int flags = 0;3576 struct tb_port *port;3577 int err;3578 3579 tb_sw_dbg(sw, "suspending switch\n");3580 3581 /*3582 * Actually only needed for Titan Ridge but for simplicity can be3583 * done for USB4 device too as CLx is re-enabled at resume.3584 */3585 tb_switch_clx_disable(sw);3586 3587 err = tb_plug_events_active(sw, false);3588 if (err)3589 return;3590 3591 tb_switch_for_each_port(sw, port) {3592 if (tb_port_has_remote(port))3593 tb_switch_suspend(port->remote->sw, runtime);3594 }3595 3596 if (runtime) {3597 /* Trigger wake when something is plugged in/out */3598 flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT;3599 flags |= TB_WAKE_ON_USB4;3600 flags |= TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE | TB_WAKE_ON_DP;3601 } else if (device_may_wakeup(&sw->dev)) {3602 flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;3603 }3604 3605 tb_switch_set_wake(sw, flags);3606 3607 if (tb_switch_is_usb4(sw))3608 usb4_switch_set_sleep(sw);3609 else3610 tb_lc_set_sleep(sw);3611}3612 3613/**3614 * tb_switch_query_dp_resource() - Query availability of DP resource3615 * @sw: Switch whose DP resource is queried3616 * @in: DP IN port3617 *3618 * Queries availability of DP resource for DP tunneling using switch3619 * specific means. Returns %true if resource is available.3620 */3621bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in)3622{3623 if (tb_switch_is_usb4(sw))3624 return usb4_switch_query_dp_resource(sw, in);3625 return tb_lc_dp_sink_query(sw, in);3626}3627 3628/**3629 * tb_switch_alloc_dp_resource() - Allocate available DP resource3630 * @sw: Switch whose DP resource is allocated3631 * @in: DP IN port3632 *3633 * Allocates DP resource for DP tunneling. The resource must be3634 * available for this to succeed (see tb_switch_query_dp_resource()).3635 * Returns %0 in success and negative errno otherwise.3636 */3637int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in)3638{3639 int ret;3640 3641 if (tb_switch_is_usb4(sw))3642 ret = usb4_switch_alloc_dp_resource(sw, in);3643 else3644 ret = tb_lc_dp_sink_alloc(sw, in);3645 3646 if (ret)3647 tb_sw_warn(sw, "failed to allocate DP resource for port %d\n",3648 in->port);3649 else3650 tb_sw_dbg(sw, "allocated DP resource for port %d\n", in->port);3651 3652 return ret;3653}3654 3655/**3656 * tb_switch_dealloc_dp_resource() - De-allocate DP resource3657 * @sw: Switch whose DP resource is de-allocated3658 * @in: DP IN port3659 *3660 * De-allocates DP resource that was previously allocated for DP3661 * tunneling.3662 */3663void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in)3664{3665 int ret;3666 3667 if (tb_switch_is_usb4(sw))3668 ret = usb4_switch_dealloc_dp_resource(sw, in);3669 else3670 ret = tb_lc_dp_sink_dealloc(sw, in);3671 3672 if (ret)3673 tb_sw_warn(sw, "failed to de-allocate DP resource for port %d\n",3674 in->port);3675 else3676 tb_sw_dbg(sw, "released DP resource for port %d\n", in->port);3677}3678 3679struct tb_sw_lookup {3680 struct tb *tb;3681 u8 link;3682 u8 depth;3683 const uuid_t *uuid;3684 u64 route;3685};3686 3687static int tb_switch_match(struct device *dev, const void *data)3688{3689 struct tb_switch *sw = tb_to_switch(dev);3690 const struct tb_sw_lookup *lookup = data;3691 3692 if (!sw)3693 return 0;3694 if (sw->tb != lookup->tb)3695 return 0;3696 3697 if (lookup->uuid)3698 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));3699 3700 if (lookup->route) {3701 return sw->config.route_lo == lower_32_bits(lookup->route) &&3702 sw->config.route_hi == upper_32_bits(lookup->route);3703 }3704 3705 /* Root switch is matched only by depth */3706 if (!lookup->depth)3707 return !sw->depth;3708 3709 return sw->link == lookup->link && sw->depth == lookup->depth;3710}3711 3712/**3713 * tb_switch_find_by_link_depth() - Find switch by link and depth3714 * @tb: Domain the switch belongs3715 * @link: Link number the switch is connected3716 * @depth: Depth of the switch in link3717 *3718 * Returned switch has reference count increased so the caller needs to3719 * call tb_switch_put() when done with the switch.3720 */3721struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)3722{3723 struct tb_sw_lookup lookup;3724 struct device *dev;3725 3726 memset(&lookup, 0, sizeof(lookup));3727 lookup.tb = tb;3728 lookup.link = link;3729 lookup.depth = depth;3730 3731 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);3732 if (dev)3733 return tb_to_switch(dev);3734 3735 return NULL;3736}3737 3738/**3739 * tb_switch_find_by_uuid() - Find switch by UUID3740 * @tb: Domain the switch belongs3741 * @uuid: UUID to look for3742 *3743 * Returned switch has reference count increased so the caller needs to3744 * call tb_switch_put() when done with the switch.3745 */3746struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)3747{3748 struct tb_sw_lookup lookup;3749 struct device *dev;3750 3751 memset(&lookup, 0, sizeof(lookup));3752 lookup.tb = tb;3753 lookup.uuid = uuid;3754 3755 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);3756 if (dev)3757 return tb_to_switch(dev);3758 3759 return NULL;3760}3761 3762/**3763 * tb_switch_find_by_route() - Find switch by route string3764 * @tb: Domain the switch belongs3765 * @route: Route string to look for3766 *3767 * Returned switch has reference count increased so the caller needs to3768 * call tb_switch_put() when done with the switch.3769 */3770struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)3771{3772 struct tb_sw_lookup lookup;3773 struct device *dev;3774 3775 if (!route)3776 return tb_switch_get(tb->root_switch);3777 3778 memset(&lookup, 0, sizeof(lookup));3779 lookup.tb = tb;3780 lookup.route = route;3781 3782 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);3783 if (dev)3784 return tb_to_switch(dev);3785 3786 return NULL;3787}3788 3789/**3790 * tb_switch_find_port() - return the first port of @type on @sw or NULL3791 * @sw: Switch to find the port from3792 * @type: Port type to look for3793 */3794struct tb_port *tb_switch_find_port(struct tb_switch *sw,3795 enum tb_port_type type)3796{3797 struct tb_port *port;3798 3799 tb_switch_for_each_port(sw, port) {3800 if (port->config.type == type)3801 return port;3802 }3803 3804 return NULL;3805}3806 3807/*3808 * Can be used for read/write a specified PCIe bridge for any Thunderbolt 33809 * device. For now used only for Titan Ridge.3810 */3811static int tb_switch_pcie_bridge_write(struct tb_switch *sw, unsigned int bridge,3812 unsigned int pcie_offset, u32 value)3813{3814 u32 offset, command, val;3815 int ret;3816 3817 if (sw->generation != 3)3818 return -EOPNOTSUPP;3819 3820 offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_WR_DATA;3821 ret = tb_sw_write(sw, &value, TB_CFG_SWITCH, offset, 1);3822 if (ret)3823 return ret;3824 3825 command = pcie_offset & TB_PLUG_EVENTS_PCIE_CMD_DW_OFFSET_MASK;3826 command |= BIT(bridge + TB_PLUG_EVENTS_PCIE_CMD_BR_SHIFT);3827 command |= TB_PLUG_EVENTS_PCIE_CMD_RD_WR_MASK;3828 command |= TB_PLUG_EVENTS_PCIE_CMD_COMMAND_VAL3829 << TB_PLUG_EVENTS_PCIE_CMD_COMMAND_SHIFT;3830 command |= TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK;3831 3832 offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_CMD;3833 3834 ret = tb_sw_write(sw, &command, TB_CFG_SWITCH, offset, 1);3835 if (ret)3836 return ret;3837 3838 ret = tb_switch_wait_for_bit(sw, offset,3839 TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK, 0, 100);3840 if (ret)3841 return ret;3842 3843 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);3844 if (ret)3845 return ret;3846 3847 if (val & TB_PLUG_EVENTS_PCIE_CMD_TIMEOUT_MASK)3848 return -ETIMEDOUT;3849 3850 return 0;3851}3852 3853/**3854 * tb_switch_pcie_l1_enable() - Enable PCIe link to enter L1 state3855 * @sw: Router to enable PCIe L13856 *3857 * For Titan Ridge switch to enter CLx state, its PCIe bridges shall enable3858 * entry to PCIe L1 state. Shall be called after the upstream PCIe tunnel3859 * was configured. Due to Intel platforms limitation, shall be called only3860 * for first hop switch.3861 */3862int tb_switch_pcie_l1_enable(struct tb_switch *sw)3863{3864 struct tb_switch *parent = tb_switch_parent(sw);3865 int ret;3866 3867 if (!tb_route(sw))3868 return 0;3869 3870 if (!tb_switch_is_titan_ridge(sw))3871 return 0;3872 3873 /* Enable PCIe L1 enable only for first hop router (depth = 1) */3874 if (tb_route(parent))3875 return 0;3876 3877 /* Write to downstream PCIe bridge #5 aka Dn4 */3878 ret = tb_switch_pcie_bridge_write(sw, 5, 0x143, 0x0c7806b1);3879 if (ret)3880 return ret;3881 3882 /* Write to Upstream PCIe bridge #0 aka Up0 */3883 return tb_switch_pcie_bridge_write(sw, 0, 0x143, 0x0c5806b1);3884}3885 3886/**3887 * tb_switch_xhci_connect() - Connect internal xHCI3888 * @sw: Router whose xHCI to connect3889 *3890 * Can be called to any router. For Alpine Ridge and Titan Ridge3891 * performs special flows that bring the xHCI functional for any device3892 * connected to the type-C port. Call only after PCIe tunnel has been3893 * established. The function only does the connect if not done already3894 * so can be called several times for the same router.3895 */3896int tb_switch_xhci_connect(struct tb_switch *sw)3897{3898 struct tb_port *port1, *port3;3899 int ret;3900 3901 if (sw->generation != 3)3902 return 0;3903 3904 port1 = &sw->ports[1];3905 port3 = &sw->ports[3];3906 3907 if (tb_switch_is_alpine_ridge(sw)) {3908 bool usb_port1, usb_port3, xhci_port1, xhci_port3;3909 3910 usb_port1 = tb_lc_is_usb_plugged(port1);3911 usb_port3 = tb_lc_is_usb_plugged(port3);3912 xhci_port1 = tb_lc_is_xhci_connected(port1);3913 xhci_port3 = tb_lc_is_xhci_connected(port3);3914 3915 /* Figure out correct USB port to connect */3916 if (usb_port1 && !xhci_port1) {3917 ret = tb_lc_xhci_connect(port1);3918 if (ret)3919 return ret;3920 }3921 if (usb_port3 && !xhci_port3)3922 return tb_lc_xhci_connect(port3);3923 } else if (tb_switch_is_titan_ridge(sw)) {3924 ret = tb_lc_xhci_connect(port1);3925 if (ret)3926 return ret;3927 return tb_lc_xhci_connect(port3);3928 }3929 3930 return 0;3931}3932 3933/**3934 * tb_switch_xhci_disconnect() - Disconnect internal xHCI3935 * @sw: Router whose xHCI to disconnect3936 *3937 * The opposite of tb_switch_xhci_connect(). Disconnects xHCI on both3938 * ports.3939 */3940void tb_switch_xhci_disconnect(struct tb_switch *sw)3941{3942 if (sw->generation == 3) {3943 struct tb_port *port1 = &sw->ports[1];3944 struct tb_port *port3 = &sw->ports[3];3945 3946 tb_lc_xhci_disconnect(port1);3947 tb_port_dbg(port1, "disconnected xHCI\n");3948 tb_lc_xhci_disconnect(port3);3949 tb_port_dbg(port3, "disconnected xHCI\n");3950 }3951}3952