Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Thunderbolt driver - switch/port utility functions
4 *
5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
6 * Copyright (C) 2018, Intel Corporation
7 */
8
9#include <linux/delay.h>
10#include <linux/idr.h>
11#include <linux/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
29static bool clx_enabled = true;
30module_param_named(clx, clx_enabled, bool, 0444);
31MODULE_PARM_DESC(clx, "allow low power states on the high-speed lanes (default: true)");
32
33/*
34 * Hold NVM authentication failure status per switch This information
35 * needs to stay around even when the switch gets power cycled so we
36 * keep it separately.
37 */
38static LIST_HEAD(nvm_auth_status_cache);
39static DEFINE_MUTEX(nvm_auth_status_lock);
40
41static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw)
42{
43 struct nvm_auth_status *st;
44
45 list_for_each_entry(st, &nvm_auth_status_cache, list) {
46 if (uuid_equal(&st->uuid, sw->uuid))
47 return st;
48 }
49
50 return NULL;
51}
52
53static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status)
54{
55 struct nvm_auth_status *st;
56
57 mutex_lock(&nvm_auth_status_lock);
58 st = __nvm_get_auth_status(sw);
59 mutex_unlock(&nvm_auth_status_lock);
60
61 *status = st ? st->status : 0;
62}
63
64static void nvm_set_auth_status(const struct tb_switch *sw, u32 status)
65{
66 struct nvm_auth_status *st;
67
68 if (WARN_ON(!sw->uuid))
69 return;
70
71 mutex_lock(&nvm_auth_status_lock);
72 st = __nvm_get_auth_status(sw);
73
74 if (!st) {
75 st = kzalloc(sizeof(*st), GFP_KERNEL);
76 if (!st)
77 goto unlock;
78
79 memcpy(&st->uuid, sw->uuid, sizeof(st->uuid));
80 INIT_LIST_HEAD(&st->list);
81 list_add_tail(&st->list, &nvm_auth_status_cache);
82 }
83
84 st->status = status;
85unlock:
86 mutex_unlock(&nvm_auth_status_lock);
87}
88
89static void nvm_clear_auth_status(const struct tb_switch *sw)
90{
91 struct nvm_auth_status *st;
92
93 mutex_lock(&nvm_auth_status_lock);
94 st = __nvm_get_auth_status(sw);
95 if (st) {
96 list_del(&st->list);
97 kfree(st);
98 }
99 mutex_unlock(&nvm_auth_status_lock);
100}
101
102static int nvm_validate_and_write(struct tb_switch *sw)
103{
104 unsigned int image_size;
105 const u8 *buf;
106 int ret;
107
108 ret = tb_nvm_validate(sw->nvm);
109 if (ret)
110 return ret;
111
112 ret = tb_nvm_write_headers(sw->nvm);
113 if (ret)
114 return ret;
115
116 buf = sw->nvm->buf_data_start;
117 image_size = sw->nvm->buf_data_size;
118
119 if (tb_switch_is_usb4(sw))
120 ret = usb4_switch_nvm_write(sw, 0, buf, image_size);
121 else
122 ret = dma_port_flash_write(sw->dma_port, 0, buf, image_size);
123 if (ret)
124 return ret;
125
126 sw->nvm->flushed = true;
127 return 0;
128}
129
130static int nvm_authenticate_host_dma_port(struct tb_switch *sw)
131{
132 int ret = 0;
133
134 /*
135 * Root switch NVM upgrade requires that we disconnect the
136 * existing paths first (in case it is not in safe mode
137 * already).
138 */
139 if (!sw->safe_mode) {
140 u32 status;
141
142 ret = tb_domain_disconnect_all_paths(sw->tb);
143 if (ret)
144 return ret;
145 /*
146 * The host controller goes away pretty soon after this if
147 * everything goes well so getting timeout is expected.
148 */
149 ret = dma_port_flash_update_auth(sw->dma_port);
150 if (!ret || ret == -ETIMEDOUT)
151 return 0;
152
153 /*
154 * Any error from update auth operation requires power
155 * cycling of the host router.
156 */
157 tb_sw_warn(sw, "failed to authenticate NVM, power cycling\n");
158 if (dma_port_flash_update_auth_status(sw->dma_port, &status) > 0)
159 nvm_set_auth_status(sw, status);
160 }
161
162 /*
163 * From safe mode we can get out by just power cycling the
164 * switch.
165 */
166 dma_port_power_cycle(sw->dma_port);
167 return ret;
168}
169
170static int nvm_authenticate_device_dma_port(struct tb_switch *sw)
171{
172 int ret, retries = 10;
173
174 ret = dma_port_flash_update_auth(sw->dma_port);
175 switch (ret) {
176 case 0:
177 case -ETIMEDOUT:
178 case -EACCES:
179 case -EINVAL:
180 /* Power cycle is required */
181 break;
182 default:
183 return ret;
184 }
185
186 /*
187 * Poll here for the authentication status. It takes some time
188 * for the device to respond (we get timeout for a while). Once
189 * we get response the device needs to be power cycled in order
190 * to the new NVM to be taken into use.
191 */
192 do {
193 u32 status;
194
195 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
196 if (ret < 0 && ret != -ETIMEDOUT)
197 return ret;
198 if (ret > 0) {
199 if (status) {
200 tb_sw_warn(sw, "failed to authenticate NVM\n");
201 nvm_set_auth_status(sw, status);
202 }
203
204 tb_sw_info(sw, "power cycling the switch now\n");
205 dma_port_power_cycle(sw->dma_port);
206 return 0;
207 }
208
209 msleep(500);
210 } while (--retries);
211
212 return -ETIMEDOUT;
213}
214
215static void nvm_authenticate_start_dma_port(struct tb_switch *sw)
216{
217 struct pci_dev *root_port;
218
219 /*
220 * During host router NVM upgrade we should not allow root port to
221 * go into D3cold because some root ports cannot trigger PME
222 * itself. To be on the safe side keep the root port in D0 during
223 * the whole upgrade process.
224 */
225 root_port = pcie_find_root_port(sw->tb->nhi->pdev);
226 if (root_port)
227 pm_runtime_get_noresume(&root_port->dev);
228}
229
230static void nvm_authenticate_complete_dma_port(struct tb_switch *sw)
231{
232 struct pci_dev *root_port;
233
234 root_port = pcie_find_root_port(sw->tb->nhi->pdev);
235 if (root_port)
236 pm_runtime_put(&root_port->dev);
237}
238
239static inline bool nvm_readable(struct tb_switch *sw)
240{
241 if (tb_switch_is_usb4(sw)) {
242 /*
243 * USB4 devices must support NVM operations but it is
244 * optional for hosts. Therefore we query the NVM sector
245 * size here and if it is supported assume NVM
246 * operations are implemented.
247 */
248 return usb4_switch_nvm_sector_size(sw) > 0;
249 }
250
251 /* Thunderbolt 2 and 3 devices support NVM through DMA port */
252 return !!sw->dma_port;
253}
254
255static inline bool nvm_upgradeable(struct tb_switch *sw)
256{
257 if (sw->no_nvm_upgrade)
258 return false;
259 return nvm_readable(sw);
260}
261
262static int nvm_authenticate(struct tb_switch *sw, bool auth_only)
263{
264 int ret;
265
266 if (tb_switch_is_usb4(sw)) {
267 if (auth_only) {
268 ret = usb4_switch_nvm_set_offset(sw, 0);
269 if (ret)
270 return ret;
271 }
272 sw->nvm->authenticating = true;
273 return usb4_switch_nvm_authenticate(sw);
274 } else if (auth_only) {
275 return -EOPNOTSUPP;
276 }
277
278 sw->nvm->authenticating = true;
279 if (!tb_route(sw)) {
280 nvm_authenticate_start_dma_port(sw);
281 ret = nvm_authenticate_host_dma_port(sw);
282 } else {
283 ret = nvm_authenticate_device_dma_port(sw);
284 }
285
286 return ret;
287}
288
289/**
290 * tb_switch_nvm_read() - Read router NVM
291 * @sw: Router whose NVM to read
292 * @address: Start address on the NVM
293 * @buf: Buffer where the read data is copied
294 * @size: Size of the buffer in bytes
295 *
296 * Reads from router NVM and returns the requested data in @buf. Locking
297 * is up to the caller. Returns %0 in success and negative errno in case
298 * of failure.
299 */
300int tb_switch_nvm_read(struct tb_switch *sw, unsigned int address, void *buf,
301 size_t size)
302{
303 if (tb_switch_is_usb4(sw))
304 return usb4_switch_nvm_read(sw, address, buf, size);
305 return dma_port_flash_read(sw->dma_port, address, buf, size);
306}
307
308static int nvm_read(void *priv, unsigned int offset, void *val, size_t bytes)
309{
310 struct tb_nvm *nvm = priv;
311 struct tb_switch *sw = tb_to_switch(nvm->dev);
312 int ret;
313
314 pm_runtime_get_sync(&sw->dev);
315
316 if (!mutex_trylock(&sw->tb->lock)) {
317 ret = restart_syscall();
318 goto out;
319 }
320
321 ret = tb_switch_nvm_read(sw, offset, val, bytes);
322 mutex_unlock(&sw->tb->lock);
323
324out:
325 pm_runtime_mark_last_busy(&sw->dev);
326 pm_runtime_put_autosuspend(&sw->dev);
327
328 return ret;
329}
330
331static int nvm_write(void *priv, unsigned int offset, void *val, size_t bytes)
332{
333 struct tb_nvm *nvm = priv;
334 struct tb_switch *sw = tb_to_switch(nvm->dev);
335 int ret;
336
337 if (!mutex_trylock(&sw->tb->lock))
338 return restart_syscall();
339
340 /*
341 * Since writing the NVM image might require some special steps,
342 * for example when CSS headers are written, we cache the image
343 * locally here and handle the special cases when the user asks
344 * us to authenticate the image.
345 */
346 ret = tb_nvm_write_buf(nvm, offset, val, bytes);
347 mutex_unlock(&sw->tb->lock);
348
349 return ret;
350}
351
352static int tb_switch_nvm_add(struct tb_switch *sw)
353{
354 struct tb_nvm *nvm;
355 int ret;
356
357 if (!nvm_readable(sw))
358 return 0;
359
360 nvm = tb_nvm_alloc(&sw->dev);
361 if (IS_ERR(nvm)) {
362 ret = PTR_ERR(nvm) == -EOPNOTSUPP ? 0 : PTR_ERR(nvm);
363 goto err_nvm;
364 }
365
366 ret = tb_nvm_read_version(nvm);
367 if (ret)
368 goto err_nvm;
369
370 /*
371 * If the switch is in safe-mode the only accessible portion of
372 * the NVM is the non-active one where userspace is expected to
373 * write new functional NVM.
374 */
375 if (!sw->safe_mode) {
376 ret = tb_nvm_add_active(nvm, nvm_read);
377 if (ret)
378 goto err_nvm;
379 }
380
381 if (!sw->no_nvm_upgrade) {
382 ret = tb_nvm_add_non_active(nvm, nvm_write);
383 if (ret)
384 goto err_nvm;
385 }
386
387 sw->nvm = nvm;
388 return 0;
389
390err_nvm:
391 tb_sw_dbg(sw, "NVM upgrade disabled\n");
392 sw->no_nvm_upgrade = true;
393 if (!IS_ERR(nvm))
394 tb_nvm_free(nvm);
395
396 return ret;
397}
398
399static void tb_switch_nvm_remove(struct tb_switch *sw)
400{
401 struct tb_nvm *nvm;
402
403 nvm = sw->nvm;
404 sw->nvm = NULL;
405
406 if (!nvm)
407 return;
408
409 /* Remove authentication status in case the switch is unplugged */
410 if (!nvm->authenticating)
411 nvm_clear_auth_status(sw);
412
413 tb_nvm_free(nvm);
414}
415
416/* port utility functions */
417
418static const char *tb_port_type(const struct tb_regs_port_header *port)
419{
420 switch (port->type >> 16) {
421 case 0:
422 switch ((u8) port->type) {
423 case 0:
424 return "Inactive";
425 case 1:
426 return "Port";
427 case 2:
428 return "NHI";
429 default:
430 return "unknown";
431 }
432 case 0x2:
433 return "Ethernet";
434 case 0x8:
435 return "SATA";
436 case 0xe:
437 return "DP/HDMI";
438 case 0x10:
439 return "PCIe";
440 case 0x20:
441 return "USB";
442 default:
443 return "unknown";
444 }
445}
446
447static void tb_dump_port(struct tb *tb, const struct tb_port *port)
448{
449 const struct tb_regs_port_header *regs = &port->config;
450
451 tb_dbg(tb,
452 " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
453 regs->port_number, regs->vendor_id, regs->device_id,
454 regs->revision, regs->thunderbolt_version, tb_port_type(regs),
455 regs->type);
456 tb_dbg(tb, " Max hop id (in/out): %d/%d\n",
457 regs->max_in_hop_id, regs->max_out_hop_id);
458 tb_dbg(tb, " Max counters: %d\n", regs->max_counters);
459 tb_dbg(tb, " NFC Credits: %#x\n", regs->nfc_credits);
460 tb_dbg(tb, " Credits (total/control): %u/%u\n", port->total_credits,
461 port->ctl_credits);
462}
463
464/**
465 * tb_port_state() - get connectedness state of a port
466 * @port: the port to check
467 *
468 * The port must have a TB_CAP_PHY (i.e. it should be a real port).
469 *
470 * Return: Returns an enum tb_port_state on success or an error code on failure.
471 */
472int tb_port_state(struct tb_port *port)
473{
474 struct tb_cap_phy phy;
475 int res;
476 if (port->cap_phy == 0) {
477 tb_port_WARN(port, "does not have a PHY\n");
478 return -EINVAL;
479 }
480 res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
481 if (res)
482 return res;
483 return phy.state;
484}
485
486/**
487 * tb_wait_for_port() - wait for a port to become ready
488 * @port: Port to wait
489 * @wait_if_unplugged: Wait also when port is unplugged
490 *
491 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
492 * wait_if_unplugged is set then we also wait if the port is in state
493 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
494 * switch resume). Otherwise we only wait if a device is registered but the link
495 * has not yet been established.
496 *
497 * Return: Returns an error code on failure. Returns 0 if the port is not
498 * connected or failed to reach state TB_PORT_UP within one second. Returns 1
499 * if the port is connected and in state TB_PORT_UP.
500 */
501int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
502{
503 int retries = 10;
504 int state;
505 if (!port->cap_phy) {
506 tb_port_WARN(port, "does not have PHY\n");
507 return -EINVAL;
508 }
509 if (tb_is_upstream_port(port)) {
510 tb_port_WARN(port, "is the upstream port\n");
511 return -EINVAL;
512 }
513
514 while (retries--) {
515 state = tb_port_state(port);
516 if (state < 0)
517 return state;
518 if (state == TB_PORT_DISABLED) {
519 tb_port_dbg(port, "is disabled (state: 0)\n");
520 return 0;
521 }
522 if (state == TB_PORT_UNPLUGGED) {
523 if (wait_if_unplugged) {
524 /* used during resume */
525 tb_port_dbg(port,
526 "is unplugged (state: 7), retrying...\n");
527 msleep(100);
528 continue;
529 }
530 tb_port_dbg(port, "is unplugged (state: 7)\n");
531 return 0;
532 }
533 if (state == TB_PORT_UP) {
534 tb_port_dbg(port, "is connected, link is up (state: 2)\n");
535 return 1;
536 }
537
538 /*
539 * After plug-in the state is TB_PORT_CONNECTING. Give it some
540 * time.
541 */
542 tb_port_dbg(port,
543 "is connected, link is not up (state: %d), retrying...\n",
544 state);
545 msleep(100);
546 }
547 tb_port_warn(port,
548 "failed to reach state TB_PORT_UP. Ignoring port...\n");
549 return 0;
550}
551
552/**
553 * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
554 * @port: Port to add/remove NFC credits
555 * @credits: Credits to add/remove
556 *
557 * Change the number of NFC credits allocated to @port by @credits. To remove
558 * NFC credits pass a negative amount of credits.
559 *
560 * Return: Returns 0 on success or an error code on failure.
561 */
562int tb_port_add_nfc_credits(struct tb_port *port, int credits)
563{
564 u32 nfc_credits;
565
566 if (credits == 0 || port->sw->is_unplugged)
567 return 0;
568
569 /*
570 * USB4 restricts programming NFC buffers to lane adapters only
571 * so skip other ports.
572 */
573 if (tb_switch_is_usb4(port->sw) && !tb_port_is_null(port))
574 return 0;
575
576 nfc_credits = port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK;
577 if (credits < 0)
578 credits = max_t(int, -nfc_credits, credits);
579
580 nfc_credits += credits;
581
582 tb_port_dbg(port, "adding %d NFC credits to %lu", credits,
583 port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK);
584
585 port->config.nfc_credits &= ~ADP_CS_4_NFC_BUFFERS_MASK;
586 port->config.nfc_credits |= nfc_credits;
587
588 return tb_port_write(port, &port->config.nfc_credits,
589 TB_CFG_PORT, ADP_CS_4, 1);
590}
591
592/**
593 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
594 * @port: Port whose counters to clear
595 * @counter: Counter index to clear
596 *
597 * Return: Returns 0 on success or an error code on failure.
598 */
599int tb_port_clear_counter(struct tb_port *port, int counter)
600{
601 u32 zero[3] = { 0, 0, 0 };
602 tb_port_dbg(port, "clearing counter %d\n", counter);
603 return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
604}
605
606/**
607 * tb_port_unlock() - Unlock downstream port
608 * @port: Port to unlock
609 *
610 * Needed for USB4 but can be called for any CIO/USB4 ports. Makes the
611 * downstream router accessible for CM.
612 */
613int tb_port_unlock(struct tb_port *port)
614{
615 if (tb_switch_is_icm(port->sw))
616 return 0;
617 if (!tb_port_is_null(port))
618 return -EINVAL;
619 if (tb_switch_is_usb4(port->sw))
620 return usb4_port_unlock(port);
621 return 0;
622}
623
624static int __tb_port_enable(struct tb_port *port, bool enable)
625{
626 int ret;
627 u32 phy;
628
629 if (!tb_port_is_null(port))
630 return -EINVAL;
631
632 ret = tb_port_read(port, &phy, TB_CFG_PORT,
633 port->cap_phy + LANE_ADP_CS_1, 1);
634 if (ret)
635 return ret;
636
637 if (enable)
638 phy &= ~LANE_ADP_CS_1_LD;
639 else
640 phy |= LANE_ADP_CS_1_LD;
641
642
643 ret = tb_port_write(port, &phy, TB_CFG_PORT,
644 port->cap_phy + LANE_ADP_CS_1, 1);
645 if (ret)
646 return ret;
647
648 tb_port_dbg(port, "lane %s\n", str_enabled_disabled(enable));
649 return 0;
650}
651
652/**
653 * tb_port_enable() - Enable lane adapter
654 * @port: Port to enable (can be %NULL)
655 *
656 * This is used for lane 0 and 1 adapters to enable it.
657 */
658int tb_port_enable(struct tb_port *port)
659{
660 return __tb_port_enable(port, true);
661}
662
663/**
664 * tb_port_disable() - Disable lane adapter
665 * @port: Port to disable (can be %NULL)
666 *
667 * This is used for lane 0 and 1 adapters to disable it.
668 */
669int tb_port_disable(struct tb_port *port)
670{
671 return __tb_port_enable(port, false);
672}
673
674/*
675 * tb_init_port() - initialize a port
676 *
677 * This is a helper method for tb_switch_alloc. Does not check or initialize
678 * any downstream switches.
679 *
680 * Return: Returns 0 on success or an error code on failure.
681 */
682static int tb_init_port(struct tb_port *port)
683{
684 int res;
685 int cap;
686
687 INIT_LIST_HEAD(&port->list);
688
689 /* Control adapter does not have configuration space */
690 if (!port->port)
691 return 0;
692
693 res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
694 if (res) {
695 if (res == -ENODEV) {
696 tb_dbg(port->sw->tb, " Port %d: not implemented\n",
697 port->port);
698 port->disabled = true;
699 return 0;
700 }
701 return res;
702 }
703
704 /* Port 0 is the switch itself and has no PHY. */
705 if (port->config.type == TB_TYPE_PORT) {
706 cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
707
708 if (cap > 0)
709 port->cap_phy = cap;
710 else
711 tb_port_WARN(port, "non switch port without a PHY\n");
712
713 cap = tb_port_find_cap(port, TB_PORT_CAP_USB4);
714 if (cap > 0)
715 port->cap_usb4 = cap;
716
717 /*
718 * USB4 ports the buffers allocated for the control path
719 * can be read from the path config space. Legacy
720 * devices we use hard-coded value.
721 */
722 if (tb_switch_is_usb4(port->sw)) {
723 struct tb_regs_hop hop;
724
725 if (!tb_port_read(port, &hop, TB_CFG_HOPS, 0, 2))
726 port->ctl_credits = hop.initial_credits;
727 }
728 if (!port->ctl_credits)
729 port->ctl_credits = 2;
730
731 } else {
732 cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
733 if (cap > 0)
734 port->cap_adap = cap;
735 }
736
737 port->total_credits =
738 (port->config.nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
739 ADP_CS_4_TOTAL_BUFFERS_SHIFT;
740
741 tb_dump_port(port->sw->tb, port);
742 return 0;
743}
744
745static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,
746 int max_hopid)
747{
748 int port_max_hopid;
749 struct ida *ida;
750
751 if (in) {
752 port_max_hopid = port->config.max_in_hop_id;
753 ida = &port->in_hopids;
754 } else {
755 port_max_hopid = port->config.max_out_hop_id;
756 ida = &port->out_hopids;
757 }
758
759 /*
760 * NHI can use HopIDs 1-max for other adapters HopIDs 0-7 are
761 * reserved.
762 */
763 if (!tb_port_is_nhi(port) && min_hopid < TB_PATH_MIN_HOPID)
764 min_hopid = TB_PATH_MIN_HOPID;
765
766 if (max_hopid < 0 || max_hopid > port_max_hopid)
767 max_hopid = port_max_hopid;
768
769 return ida_simple_get(ida, min_hopid, max_hopid + 1, GFP_KERNEL);
770}
771
772/**
773 * tb_port_alloc_in_hopid() - Allocate input HopID from port
774 * @port: Port to allocate HopID for
775 * @min_hopid: Minimum acceptable input HopID
776 * @max_hopid: Maximum acceptable input HopID
777 *
778 * Return: HopID between @min_hopid and @max_hopid or negative errno in
779 * case of error.
780 */
781int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)
782{
783 return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);
784}
785
786/**
787 * tb_port_alloc_out_hopid() - Allocate output HopID from port
788 * @port: Port to allocate HopID for
789 * @min_hopid: Minimum acceptable output HopID
790 * @max_hopid: Maximum acceptable output HopID
791 *
792 * Return: HopID between @min_hopid and @max_hopid or negative errno in
793 * case of error.
794 */
795int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)
796{
797 return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);
798}
799
800/**
801 * tb_port_release_in_hopid() - Release allocated input HopID from port
802 * @port: Port whose HopID to release
803 * @hopid: HopID to release
804 */
805void tb_port_release_in_hopid(struct tb_port *port, int hopid)
806{
807 ida_simple_remove(&port->in_hopids, hopid);
808}
809
810/**
811 * tb_port_release_out_hopid() - Release allocated output HopID from port
812 * @port: Port whose HopID to release
813 * @hopid: HopID to release
814 */
815void tb_port_release_out_hopid(struct tb_port *port, int hopid)
816{
817 ida_simple_remove(&port->out_hopids, hopid);
818}
819
820static inline bool tb_switch_is_reachable(const struct tb_switch *parent,
821 const struct tb_switch *sw)
822{
823 u64 mask = (1ULL << parent->config.depth * 8) - 1;
824 return (tb_route(parent) & mask) == (tb_route(sw) & mask);
825}
826
827/**
828 * tb_next_port_on_path() - Return next port for given port on a path
829 * @start: Start port of the walk
830 * @end: End port of the walk
831 * @prev: Previous port (%NULL if this is the first)
832 *
833 * This function can be used to walk from one port to another if they
834 * are connected through zero or more switches. If the @prev is dual
835 * link port, the function follows that link and returns another end on
836 * that same link.
837 *
838 * If the @end port has been reached, return %NULL.
839 *
840 * Domain tb->lock must be held when this function is called.
841 */
842struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
843 struct tb_port *prev)
844{
845 struct tb_port *next;
846
847 if (!prev)
848 return start;
849
850 if (prev->sw == end->sw) {
851 if (prev == end)
852 return NULL;
853 return end;
854 }
855
856 if (tb_switch_is_reachable(prev->sw, end->sw)) {
857 next = tb_port_at(tb_route(end->sw), prev->sw);
858 /* Walk down the topology if next == prev */
859 if (prev->remote &&
860 (next == prev || next->dual_link_port == prev))
861 next = prev->remote;
862 } else {
863 if (tb_is_upstream_port(prev)) {
864 next = prev->remote;
865 } else {
866 next = tb_upstream_port(prev->sw);
867 /*
868 * Keep the same link if prev and next are both
869 * dual link ports.
870 */
871 if (next->dual_link_port &&
872 next->link_nr != prev->link_nr) {
873 next = next->dual_link_port;
874 }
875 }
876 }
877
878 return next != prev ? next : NULL;
879}
880
881/**
882 * tb_port_get_link_speed() - Get current link speed
883 * @port: Port to check (USB4 or CIO)
884 *
885 * Returns link speed in Gb/s or negative errno in case of failure.
886 */
887int tb_port_get_link_speed(struct tb_port *port)
888{
889 u32 val, speed;
890 int ret;
891
892 if (!port->cap_phy)
893 return -EINVAL;
894
895 ret = tb_port_read(port, &val, TB_CFG_PORT,
896 port->cap_phy + LANE_ADP_CS_1, 1);
897 if (ret)
898 return ret;
899
900 speed = (val & LANE_ADP_CS_1_CURRENT_SPEED_MASK) >>
901 LANE_ADP_CS_1_CURRENT_SPEED_SHIFT;
902 return speed == LANE_ADP_CS_1_CURRENT_SPEED_GEN3 ? 20 : 10;
903}
904
905/**
906 * tb_port_get_link_width() - Get current link width
907 * @port: Port to check (USB4 or CIO)
908 *
909 * Returns link width. Return values can be 1 (Single-Lane), 2 (Dual-Lane)
910 * or negative errno in case of failure.
911 */
912int tb_port_get_link_width(struct tb_port *port)
913{
914 u32 val;
915 int ret;
916
917 if (!port->cap_phy)
918 return -EINVAL;
919
920 ret = tb_port_read(port, &val, TB_CFG_PORT,
921 port->cap_phy + LANE_ADP_CS_1, 1);
922 if (ret)
923 return ret;
924
925 return (val & LANE_ADP_CS_1_CURRENT_WIDTH_MASK) >>
926 LANE_ADP_CS_1_CURRENT_WIDTH_SHIFT;
927}
928
929static bool tb_port_is_width_supported(struct tb_port *port, int width)
930{
931 u32 phy, widths;
932 int ret;
933
934 if (!port->cap_phy)
935 return false;
936
937 ret = tb_port_read(port, &phy, TB_CFG_PORT,
938 port->cap_phy + LANE_ADP_CS_0, 1);
939 if (ret)
940 return false;
941
942 widths = (phy & LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK) >>
943 LANE_ADP_CS_0_SUPPORTED_WIDTH_SHIFT;
944
945 return !!(widths & width);
946}
947
948/**
949 * tb_port_set_link_width() - Set target link width of the lane adapter
950 * @port: Lane adapter
951 * @width: Target link width (%1 or %2)
952 *
953 * Sets the target link width of the lane adapter to @width. Does not
954 * enable/disable lane bonding. For that call tb_port_set_lane_bonding().
955 *
956 * Return: %0 in case of success and negative errno in case of error
957 */
958int tb_port_set_link_width(struct tb_port *port, unsigned int width)
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 val &= ~LANE_ADP_CS_1_TARGET_WIDTH_MASK;
972 switch (width) {
973 case 1:
974 val |= LANE_ADP_CS_1_TARGET_WIDTH_SINGLE <<
975 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
976 break;
977 case 2:
978 val |= LANE_ADP_CS_1_TARGET_WIDTH_DUAL <<
979 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
980 break;
981 default:
982 return -EINVAL;
983 }
984
985 return tb_port_write(port, &val, TB_CFG_PORT,
986 port->cap_phy + LANE_ADP_CS_1, 1);
987}
988
989/**
990 * tb_port_set_lane_bonding() - Enable/disable lane bonding
991 * @port: Lane adapter
992 * @bonding: enable/disable bonding
993 *
994 * Enables or disables lane bonding. This should be called after target
995 * link width has been set (tb_port_set_link_width()). Note in most
996 * cases one should use tb_port_lane_bonding_enable() instead to enable
997 * lane bonding.
998 *
999 * As a side effect sets @port->bonding accordingly (and does the same
1000 * for lane 1 too).
1001 *
1002 * Return: %0 in case of success and negative errno in case of error
1003 */
1004int tb_port_set_lane_bonding(struct tb_port *port, bool bonding)
1005{
1006 u32 val;
1007 int ret;
1008
1009 if (!port->cap_phy)
1010 return -EINVAL;
1011
1012 ret = tb_port_read(port, &val, TB_CFG_PORT,
1013 port->cap_phy + LANE_ADP_CS_1, 1);
1014 if (ret)
1015 return ret;
1016
1017 if (bonding)
1018 val |= LANE_ADP_CS_1_LB;
1019 else
1020 val &= ~LANE_ADP_CS_1_LB;
1021
1022 ret = tb_port_write(port, &val, TB_CFG_PORT,
1023 port->cap_phy + LANE_ADP_CS_1, 1);
1024 if (ret)
1025 return ret;
1026
1027 /*
1028 * When lane 0 bonding is set it will affect lane 1 too so
1029 * update both.
1030 */
1031 port->bonded = bonding;
1032 port->dual_link_port->bonded = bonding;
1033
1034 return 0;
1035}
1036
1037/**
1038 * tb_port_lane_bonding_enable() - Enable bonding on port
1039 * @port: port to enable
1040 *
1041 * Enable bonding by setting the link width of the port and the other
1042 * port in case of dual link port. Does not wait for the link to
1043 * actually reach the bonded state so caller needs to call
1044 * tb_port_wait_for_link_width() before enabling any paths through the
1045 * link to make sure the link is in expected state.
1046 *
1047 * Return: %0 in case of success and negative errno in case of error
1048 */
1049int tb_port_lane_bonding_enable(struct tb_port *port)
1050{
1051 int ret;
1052
1053 /*
1054 * Enable lane bonding for both links if not already enabled by
1055 * for example the boot firmware.
1056 */
1057 ret = tb_port_get_link_width(port);
1058 if (ret == 1) {
1059 ret = tb_port_set_link_width(port, 2);
1060 if (ret)
1061 goto err_lane0;
1062 }
1063
1064 ret = tb_port_get_link_width(port->dual_link_port);
1065 if (ret == 1) {
1066 ret = tb_port_set_link_width(port->dual_link_port, 2);
1067 if (ret)
1068 goto err_lane0;
1069 }
1070
1071 ret = tb_port_set_lane_bonding(port, true);
1072 if (ret)
1073 goto err_lane1;
1074
1075 return 0;
1076
1077err_lane1:
1078 tb_port_set_link_width(port->dual_link_port, 1);
1079err_lane0:
1080 tb_port_set_link_width(port, 1);
1081 return ret;
1082}
1083
1084/**
1085 * tb_port_lane_bonding_disable() - Disable bonding on port
1086 * @port: port to disable
1087 *
1088 * Disable bonding by setting the link width of the port and the
1089 * other port in case of dual link port.
1090 */
1091void tb_port_lane_bonding_disable(struct tb_port *port)
1092{
1093 tb_port_set_lane_bonding(port, false);
1094 tb_port_set_link_width(port->dual_link_port, 1);
1095 tb_port_set_link_width(port, 1);
1096}
1097
1098/**
1099 * tb_port_wait_for_link_width() - Wait until link reaches specific width
1100 * @port: Port to wait for
1101 * @width: Expected link width (%1 or %2)
1102 * @timeout_msec: Timeout in ms how long to wait
1103 *
1104 * Should be used after both ends of the link have been bonded (or
1105 * bonding has been disabled) to wait until the link actually reaches
1106 * the expected state. Returns %-ETIMEDOUT if the @width was not reached
1107 * within the given timeout, %0 if it did.
1108 */
1109int tb_port_wait_for_link_width(struct tb_port *port, int width,
1110 int timeout_msec)
1111{
1112 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
1113 int ret;
1114
1115 do {
1116 ret = tb_port_get_link_width(port);
1117 if (ret < 0) {
1118 /*
1119 * Sometimes we get port locked error when
1120 * polling the lanes so we can ignore it and
1121 * retry.
1122 */
1123 if (ret != -EACCES)
1124 return ret;
1125 } else if (ret == width) {
1126 return 0;
1127 }
1128
1129 usleep_range(1000, 2000);
1130 } while (ktime_before(ktime_get(), timeout));
1131
1132 return -ETIMEDOUT;
1133}
1134
1135static int tb_port_do_update_credits(struct tb_port *port)
1136{
1137 u32 nfc_credits;
1138 int ret;
1139
1140 ret = tb_port_read(port, &nfc_credits, TB_CFG_PORT, ADP_CS_4, 1);
1141 if (ret)
1142 return ret;
1143
1144 if (nfc_credits != port->config.nfc_credits) {
1145 u32 total;
1146
1147 total = (nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
1148 ADP_CS_4_TOTAL_BUFFERS_SHIFT;
1149
1150 tb_port_dbg(port, "total credits changed %u -> %u\n",
1151 port->total_credits, total);
1152
1153 port->config.nfc_credits = nfc_credits;
1154 port->total_credits = total;
1155 }
1156
1157 return 0;
1158}
1159
1160/**
1161 * tb_port_update_credits() - Re-read port total credits
1162 * @port: Port to update
1163 *
1164 * After the link is bonded (or bonding was disabled) the port total
1165 * credits may change, so this function needs to be called to re-read
1166 * the credits. Updates also the second lane adapter.
1167 */
1168int tb_port_update_credits(struct tb_port *port)
1169{
1170 int ret;
1171
1172 ret = tb_port_do_update_credits(port);
1173 if (ret)
1174 return ret;
1175 return tb_port_do_update_credits(port->dual_link_port);
1176}
1177
1178static int __tb_port_pm_secondary_set(struct tb_port *port, bool secondary)
1179{
1180 u32 phy;
1181 int ret;
1182
1183 ret = tb_port_read(port, &phy, TB_CFG_PORT,
1184 port->cap_phy + LANE_ADP_CS_1, 1);
1185 if (ret)
1186 return ret;
1187
1188 if (secondary)
1189 phy |= LANE_ADP_CS_1_PMS;
1190 else
1191 phy &= ~LANE_ADP_CS_1_PMS;
1192
1193 return tb_port_write(port, &phy, TB_CFG_PORT,
1194 port->cap_phy + LANE_ADP_CS_1, 1);
1195}
1196
1197static int tb_port_pm_secondary_enable(struct tb_port *port)
1198{
1199 return __tb_port_pm_secondary_set(port, true);
1200}
1201
1202static int tb_port_pm_secondary_disable(struct tb_port *port)
1203{
1204 return __tb_port_pm_secondary_set(port, false);
1205}
1206
1207/* Called for USB4 or Titan Ridge routers only */
1208static bool tb_port_clx_supported(struct tb_port *port, unsigned int clx_mask)
1209{
1210 u32 val, mask = 0;
1211 bool ret;
1212
1213 /* Don't enable CLx in case of two single-lane links */
1214 if (!port->bonded && port->dual_link_port)
1215 return false;
1216
1217 /* Don't enable CLx in case of inter-domain link */
1218 if (port->xdomain)
1219 return false;
1220
1221 if (tb_switch_is_usb4(port->sw)) {
1222 if (!usb4_port_clx_supported(port))
1223 return false;
1224 } else if (!tb_lc_is_clx_supported(port)) {
1225 return false;
1226 }
1227
1228 if (clx_mask & TB_CL1) {
1229 /* CL0s and CL1 are enabled and supported together */
1230 mask |= LANE_ADP_CS_0_CL0S_SUPPORT | LANE_ADP_CS_0_CL1_SUPPORT;
1231 }
1232 if (clx_mask & TB_CL2)
1233 mask |= LANE_ADP_CS_0_CL2_SUPPORT;
1234
1235 ret = tb_port_read(port, &val, TB_CFG_PORT,
1236 port->cap_phy + LANE_ADP_CS_0, 1);
1237 if (ret)
1238 return false;
1239
1240 return !!(val & mask);
1241}
1242
1243static int __tb_port_clx_set(struct tb_port *port, enum tb_clx clx, bool enable)
1244{
1245 u32 phy, mask;
1246 int ret;
1247
1248 /* CL0s and CL1 are enabled and supported together */
1249 if (clx == TB_CL1)
1250 mask = LANE_ADP_CS_1_CL0S_ENABLE | LANE_ADP_CS_1_CL1_ENABLE;
1251 else
1252 /* For now we support only CL0s and CL1. Not CL2 */
1253 return -EOPNOTSUPP;
1254
1255 ret = tb_port_read(port, &phy, TB_CFG_PORT,
1256 port->cap_phy + LANE_ADP_CS_1, 1);
1257 if (ret)
1258 return ret;
1259
1260 if (enable)
1261 phy |= mask;
1262 else
1263 phy &= ~mask;
1264
1265 return tb_port_write(port, &phy, TB_CFG_PORT,
1266 port->cap_phy + LANE_ADP_CS_1, 1);
1267}
1268
1269static int tb_port_clx_disable(struct tb_port *port, enum tb_clx clx)
1270{
1271 return __tb_port_clx_set(port, clx, false);
1272}
1273
1274static int tb_port_clx_enable(struct tb_port *port, enum tb_clx clx)
1275{
1276 return __tb_port_clx_set(port, clx, true);
1277}
1278
1279/**
1280 * tb_port_is_clx_enabled() - Is given CL state enabled
1281 * @port: USB4 port to check
1282 * @clx_mask: Mask of CL states to check
1283 *
1284 * Returns true if any of the given CL states is enabled for @port.
1285 */
1286bool tb_port_is_clx_enabled(struct tb_port *port, unsigned int clx_mask)
1287{
1288 u32 val, mask = 0;
1289 int ret;
1290
1291 if (!tb_port_clx_supported(port, clx_mask))
1292 return false;
1293
1294 if (clx_mask & TB_CL1)
1295 mask |= LANE_ADP_CS_1_CL0S_ENABLE | LANE_ADP_CS_1_CL1_ENABLE;
1296 if (clx_mask & TB_CL2)
1297 mask |= LANE_ADP_CS_1_CL2_ENABLE;
1298
1299 ret = tb_port_read(port, &val, TB_CFG_PORT,
1300 port->cap_phy + LANE_ADP_CS_1, 1);
1301 if (ret)
1302 return false;
1303
1304 return !!(val & mask);
1305}
1306
1307static int tb_port_start_lane_initialization(struct tb_port *port)
1308{
1309 int ret;
1310
1311 if (tb_switch_is_usb4(port->sw))
1312 return 0;
1313
1314 ret = tb_lc_start_lane_initialization(port);
1315 return ret == -EINVAL ? 0 : ret;
1316}
1317
1318/*
1319 * Returns true if the port had something (router, XDomain) connected
1320 * before suspend.
1321 */
1322static bool tb_port_resume(struct tb_port *port)
1323{
1324 bool has_remote = tb_port_has_remote(port);
1325
1326 if (port->usb4) {
1327 usb4_port_device_resume(port->usb4);
1328 } else if (!has_remote) {
1329 /*
1330 * For disconnected downstream lane adapters start lane
1331 * initialization now so we detect future connects.
1332 *
1333 * For XDomain start the lane initialzation now so the
1334 * link gets re-established.
1335 *
1336 * This is only needed for non-USB4 ports.
1337 */
1338 if (!tb_is_upstream_port(port) || port->xdomain)
1339 tb_port_start_lane_initialization(port);
1340 }
1341
1342 return has_remote || port->xdomain;
1343}
1344
1345/**
1346 * tb_port_is_enabled() - Is the adapter port enabled
1347 * @port: Port to check
1348 */
1349bool tb_port_is_enabled(struct tb_port *port)
1350{
1351 switch (port->config.type) {
1352 case TB_TYPE_PCIE_UP:
1353 case TB_TYPE_PCIE_DOWN:
1354 return tb_pci_port_is_enabled(port);
1355
1356 case TB_TYPE_DP_HDMI_IN:
1357 case TB_TYPE_DP_HDMI_OUT:
1358 return tb_dp_port_is_enabled(port);
1359
1360 case TB_TYPE_USB3_UP:
1361 case TB_TYPE_USB3_DOWN:
1362 return tb_usb3_port_is_enabled(port);
1363
1364 default:
1365 return false;
1366 }
1367}
1368
1369/**
1370 * tb_usb3_port_is_enabled() - Is the USB3 adapter port enabled
1371 * @port: USB3 adapter port to check
1372 */
1373bool tb_usb3_port_is_enabled(struct tb_port *port)
1374{
1375 u32 data;
1376
1377 if (tb_port_read(port, &data, TB_CFG_PORT,
1378 port->cap_adap + ADP_USB3_CS_0, 1))
1379 return false;
1380
1381 return !!(data & ADP_USB3_CS_0_PE);
1382}
1383
1384/**
1385 * tb_usb3_port_enable() - Enable USB3 adapter port
1386 * @port: USB3 adapter port to enable
1387 * @enable: Enable/disable the USB3 adapter
1388 */
1389int tb_usb3_port_enable(struct tb_port *port, bool enable)
1390{
1391 u32 word = enable ? (ADP_USB3_CS_0_PE | ADP_USB3_CS_0_V)
1392 : ADP_USB3_CS_0_V;
1393
1394 if (!port->cap_adap)
1395 return -ENXIO;
1396 return tb_port_write(port, &word, TB_CFG_PORT,
1397 port->cap_adap + ADP_USB3_CS_0, 1);
1398}
1399
1400/**
1401 * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
1402 * @port: PCIe port to check
1403 */
1404bool tb_pci_port_is_enabled(struct tb_port *port)
1405{
1406 u32 data;
1407
1408 if (tb_port_read(port, &data, TB_CFG_PORT,
1409 port->cap_adap + ADP_PCIE_CS_0, 1))
1410 return false;
1411
1412 return !!(data & ADP_PCIE_CS_0_PE);
1413}
1414
1415/**
1416 * tb_pci_port_enable() - Enable PCIe adapter port
1417 * @port: PCIe port to enable
1418 * @enable: Enable/disable the PCIe adapter
1419 */
1420int tb_pci_port_enable(struct tb_port *port, bool enable)
1421{
1422 u32 word = enable ? ADP_PCIE_CS_0_PE : 0x0;
1423 if (!port->cap_adap)
1424 return -ENXIO;
1425 return tb_port_write(port, &word, TB_CFG_PORT,
1426 port->cap_adap + ADP_PCIE_CS_0, 1);
1427}
1428
1429/**
1430 * tb_dp_port_hpd_is_active() - Is HPD already active
1431 * @port: DP out port to check
1432 *
1433 * Checks if the DP OUT adapter port has HDP bit already set.
1434 */
1435int tb_dp_port_hpd_is_active(struct tb_port *port)
1436{
1437 u32 data;
1438 int ret;
1439
1440 ret = tb_port_read(port, &data, TB_CFG_PORT,
1441 port->cap_adap + ADP_DP_CS_2, 1);
1442 if (ret)
1443 return ret;
1444
1445 return !!(data & ADP_DP_CS_2_HDP);
1446}
1447
1448/**
1449 * tb_dp_port_hpd_clear() - Clear HPD from DP IN port
1450 * @port: Port to clear HPD
1451 *
1452 * If the DP IN port has HDP set, this function can be used to clear it.
1453 */
1454int tb_dp_port_hpd_clear(struct tb_port *port)
1455{
1456 u32 data;
1457 int ret;
1458
1459 ret = tb_port_read(port, &data, TB_CFG_PORT,
1460 port->cap_adap + ADP_DP_CS_3, 1);
1461 if (ret)
1462 return ret;
1463
1464 data |= ADP_DP_CS_3_HDPC;
1465 return tb_port_write(port, &data, TB_CFG_PORT,
1466 port->cap_adap + ADP_DP_CS_3, 1);
1467}
1468
1469/**
1470 * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
1471 * @port: DP IN/OUT port to set hops
1472 * @video: Video Hop ID
1473 * @aux_tx: AUX TX Hop ID
1474 * @aux_rx: AUX RX Hop ID
1475 *
1476 * Programs specified Hop IDs for DP IN/OUT port. Can be called for USB4
1477 * router DP adapters too but does not program the values as the fields
1478 * are read-only.
1479 */
1480int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
1481 unsigned int aux_tx, unsigned int aux_rx)
1482{
1483 u32 data[2];
1484 int ret;
1485
1486 if (tb_switch_is_usb4(port->sw))
1487 return 0;
1488
1489 ret = tb_port_read(port, data, TB_CFG_PORT,
1490 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1491 if (ret)
1492 return ret;
1493
1494 data[0] &= ~ADP_DP_CS_0_VIDEO_HOPID_MASK;
1495 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1496 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1497
1498 data[0] |= (video << ADP_DP_CS_0_VIDEO_HOPID_SHIFT) &
1499 ADP_DP_CS_0_VIDEO_HOPID_MASK;
1500 data[1] |= aux_tx & ADP_DP_CS_1_AUX_TX_HOPID_MASK;
1501 data[1] |= (aux_rx << ADP_DP_CS_1_AUX_RX_HOPID_SHIFT) &
1502 ADP_DP_CS_1_AUX_RX_HOPID_MASK;
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/**
1509 * tb_dp_port_is_enabled() - Is DP adapter port enabled
1510 * @port: DP adapter port to check
1511 */
1512bool tb_dp_port_is_enabled(struct tb_port *port)
1513{
1514 u32 data[2];
1515
1516 if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap + ADP_DP_CS_0,
1517 ARRAY_SIZE(data)))
1518 return false;
1519
1520 return !!(data[0] & (ADP_DP_CS_0_VE | ADP_DP_CS_0_AE));
1521}
1522
1523/**
1524 * tb_dp_port_enable() - Enables/disables DP paths of a port
1525 * @port: DP IN/OUT port
1526 * @enable: Enable/disable DP path
1527 *
1528 * Once Hop IDs are programmed DP paths can be enabled or disabled by
1529 * calling this function.
1530 */
1531int tb_dp_port_enable(struct tb_port *port, bool enable)
1532{
1533 u32 data[2];
1534 int ret;
1535
1536 ret = tb_port_read(port, data, TB_CFG_PORT,
1537 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1538 if (ret)
1539 return ret;
1540
1541 if (enable)
1542 data[0] |= ADP_DP_CS_0_VE | ADP_DP_CS_0_AE;
1543 else
1544 data[0] &= ~(ADP_DP_CS_0_VE | ADP_DP_CS_0_AE);
1545
1546 return tb_port_write(port, data, TB_CFG_PORT,
1547 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1548}
1549
1550/* switch utility functions */
1551
1552static const char *tb_switch_generation_name(const struct tb_switch *sw)
1553{
1554 switch (sw->generation) {
1555 case 1:
1556 return "Thunderbolt 1";
1557 case 2:
1558 return "Thunderbolt 2";
1559 case 3:
1560 return "Thunderbolt 3";
1561 case 4:
1562 return "USB4";
1563 default:
1564 return "Unknown";
1565 }
1566}
1567
1568static void tb_dump_switch(const struct tb *tb, const struct tb_switch *sw)
1569{
1570 const struct tb_regs_switch_header *regs = &sw->config;
1571
1572 tb_dbg(tb, " %s Switch: %x:%x (Revision: %d, TB Version: %d)\n",
1573 tb_switch_generation_name(sw), regs->vendor_id, regs->device_id,
1574 regs->revision, regs->thunderbolt_version);
1575 tb_dbg(tb, " Max Port Number: %d\n", regs->max_port_number);
1576 tb_dbg(tb, " Config:\n");
1577 tb_dbg(tb,
1578 " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
1579 regs->upstream_port_number, regs->depth,
1580 (((u64) regs->route_hi) << 32) | regs->route_lo,
1581 regs->enabled, regs->plug_events_delay);
1582 tb_dbg(tb, " unknown1: %#x unknown4: %#x\n",
1583 regs->__unknown1, regs->__unknown4);
1584}
1585
1586/**
1587 * tb_switch_reset() - reconfigure route, enable and send TB_CFG_PKG_RESET
1588 * @sw: Switch to reset
1589 *
1590 * Return: Returns 0 on success or an error code on failure.
1591 */
1592int tb_switch_reset(struct tb_switch *sw)
1593{
1594 struct tb_cfg_result res;
1595
1596 if (sw->generation > 1)
1597 return 0;
1598
1599 tb_sw_dbg(sw, "resetting switch\n");
1600
1601 res.err = tb_sw_write(sw, ((u32 *) &sw->config) + 2,
1602 TB_CFG_SWITCH, 2, 2);
1603 if (res.err)
1604 return res.err;
1605 res = tb_cfg_reset(sw->tb->ctl, tb_route(sw));
1606 if (res.err > 0)
1607 return -EIO;
1608 return res.err;
1609}
1610
1611/**
1612 * tb_switch_wait_for_bit() - Wait for specified value of bits in offset
1613 * @sw: Router to read the offset value from
1614 * @offset: Offset in the router config space to read from
1615 * @bit: Bit mask in the offset to wait for
1616 * @value: Value of the bits to wait for
1617 * @timeout_msec: Timeout in ms how long to wait
1618 *
1619 * Wait till the specified bits in specified offset reach specified value.
1620 * Returns %0 in case of success, %-ETIMEDOUT if the @value was not reached
1621 * within the given timeout or a negative errno in case of failure.
1622 */
1623int tb_switch_wait_for_bit(struct tb_switch *sw, u32 offset, u32 bit,
1624 u32 value, int timeout_msec)
1625{
1626 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
1627
1628 do {
1629 u32 val;
1630 int ret;
1631
1632 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
1633 if (ret)
1634 return ret;
1635
1636 if ((val & bit) == value)
1637 return 0;
1638
1639 usleep_range(50, 100);
1640 } while (ktime_before(ktime_get(), timeout));
1641
1642 return -ETIMEDOUT;
1643}
1644
1645/*
1646 * tb_plug_events_active() - enable/disable plug events on a switch
1647 *
1648 * Also configures a sane plug_events_delay of 255ms.
1649 *
1650 * Return: Returns 0 on success or an error code on failure.
1651 */
1652static int tb_plug_events_active(struct tb_switch *sw, bool active)
1653{
1654 u32 data;
1655 int res;
1656
1657 if (tb_switch_is_icm(sw) || tb_switch_is_usb4(sw))
1658 return 0;
1659
1660 sw->config.plug_events_delay = 0xff;
1661 res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
1662 if (res)
1663 return res;
1664
1665 res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
1666 if (res)
1667 return res;
1668
1669 if (active) {
1670 data = data & 0xFFFFFF83;
1671 switch (sw->config.device_id) {
1672 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1673 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1674 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1675 break;
1676 default:
1677 /*
1678 * Skip Alpine Ridge, it needs to have vendor
1679 * specific USB hotplug event enabled for the
1680 * internal xHCI to work.
1681 */
1682 if (!tb_switch_is_alpine_ridge(sw))
1683 data |= TB_PLUG_EVENTS_USB_DISABLE;
1684 }
1685 } else {
1686 data = data | 0x7c;
1687 }
1688 return tb_sw_write(sw, &data, TB_CFG_SWITCH,
1689 sw->cap_plug_events + 1, 1);
1690}
1691
1692static ssize_t authorized_show(struct device *dev,
1693 struct device_attribute *attr,
1694 char *buf)
1695{
1696 struct tb_switch *sw = tb_to_switch(dev);
1697
1698 return sysfs_emit(buf, "%u\n", sw->authorized);
1699}
1700
1701static int disapprove_switch(struct device *dev, void *not_used)
1702{
1703 char *envp[] = { "AUTHORIZED=0", NULL };
1704 struct tb_switch *sw;
1705
1706 sw = tb_to_switch(dev);
1707 if (sw && sw->authorized) {
1708 int ret;
1709
1710 /* First children */
1711 ret = device_for_each_child_reverse(&sw->dev, NULL, disapprove_switch);
1712 if (ret)
1713 return ret;
1714
1715 ret = tb_domain_disapprove_switch(sw->tb, sw);
1716 if (ret)
1717 return ret;
1718
1719 sw->authorized = 0;
1720 kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);
1721 }
1722
1723 return 0;
1724}
1725
1726static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
1727{
1728 char envp_string[13];
1729 int ret = -EINVAL;
1730 char *envp[] = { envp_string, NULL };
1731
1732 if (!mutex_trylock(&sw->tb->lock))
1733 return restart_syscall();
1734
1735 if (!!sw->authorized == !!val)
1736 goto unlock;
1737
1738 switch (val) {
1739 /* Disapprove switch */
1740 case 0:
1741 if (tb_route(sw)) {
1742 ret = disapprove_switch(&sw->dev, NULL);
1743 goto unlock;
1744 }
1745 break;
1746
1747 /* Approve switch */
1748 case 1:
1749 if (sw->key)
1750 ret = tb_domain_approve_switch_key(sw->tb, sw);
1751 else
1752 ret = tb_domain_approve_switch(sw->tb, sw);
1753 break;
1754
1755 /* Challenge switch */
1756 case 2:
1757 if (sw->key)
1758 ret = tb_domain_challenge_switch_key(sw->tb, sw);
1759 break;
1760
1761 default:
1762 break;
1763 }
1764
1765 if (!ret) {
1766 sw->authorized = val;
1767 /*
1768 * Notify status change to the userspace, informing the new
1769 * value of /sys/bus/thunderbolt/devices/.../authorized.
1770 */
1771 sprintf(envp_string, "AUTHORIZED=%u", sw->authorized);
1772 kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);
1773 }
1774
1775unlock:
1776 mutex_unlock(&sw->tb->lock);
1777 return ret;
1778}
1779
1780static ssize_t authorized_store(struct device *dev,
1781 struct device_attribute *attr,
1782 const char *buf, size_t count)
1783{
1784 struct tb_switch *sw = tb_to_switch(dev);
1785 unsigned int val;
1786 ssize_t ret;
1787
1788 ret = kstrtouint(buf, 0, &val);
1789 if (ret)
1790 return ret;
1791 if (val > 2)
1792 return -EINVAL;
1793
1794 pm_runtime_get_sync(&sw->dev);
1795 ret = tb_switch_set_authorized(sw, val);
1796 pm_runtime_mark_last_busy(&sw->dev);
1797 pm_runtime_put_autosuspend(&sw->dev);
1798
1799 return ret ? ret : count;
1800}
1801static DEVICE_ATTR_RW(authorized);
1802
1803static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
1804 char *buf)
1805{
1806 struct tb_switch *sw = tb_to_switch(dev);
1807
1808 return sysfs_emit(buf, "%u\n", sw->boot);
1809}
1810static DEVICE_ATTR_RO(boot);
1811
1812static ssize_t device_show(struct device *dev, struct device_attribute *attr,
1813 char *buf)
1814{
1815 struct tb_switch *sw = tb_to_switch(dev);
1816
1817 return sysfs_emit(buf, "%#x\n", sw->device);
1818}
1819static DEVICE_ATTR_RO(device);
1820
1821static ssize_t
1822device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1823{
1824 struct tb_switch *sw = tb_to_switch(dev);
1825
1826 return sysfs_emit(buf, "%s\n", sw->device_name ?: "");
1827}
1828static DEVICE_ATTR_RO(device_name);
1829
1830static ssize_t
1831generation_show(struct device *dev, struct device_attribute *attr, char *buf)
1832{
1833 struct tb_switch *sw = tb_to_switch(dev);
1834
1835 return sysfs_emit(buf, "%u\n", sw->generation);
1836}
1837static DEVICE_ATTR_RO(generation);
1838
1839static ssize_t key_show(struct device *dev, struct device_attribute *attr,
1840 char *buf)
1841{
1842 struct tb_switch *sw = tb_to_switch(dev);
1843 ssize_t ret;
1844
1845 if (!mutex_trylock(&sw->tb->lock))
1846 return restart_syscall();
1847
1848 if (sw->key)
1849 ret = sysfs_emit(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
1850 else
1851 ret = sysfs_emit(buf, "\n");
1852
1853 mutex_unlock(&sw->tb->lock);
1854 return ret;
1855}
1856
1857static ssize_t key_store(struct device *dev, struct device_attribute *attr,
1858 const char *buf, size_t count)
1859{
1860 struct tb_switch *sw = tb_to_switch(dev);
1861 u8 key[TB_SWITCH_KEY_SIZE];
1862 ssize_t ret = count;
1863 bool clear = false;
1864
1865 if (!strcmp(buf, "\n"))
1866 clear = true;
1867 else if (hex2bin(key, buf, sizeof(key)))
1868 return -EINVAL;
1869
1870 if (!mutex_trylock(&sw->tb->lock))
1871 return restart_syscall();
1872
1873 if (sw->authorized) {
1874 ret = -EBUSY;
1875 } else {
1876 kfree(sw->key);
1877 if (clear) {
1878 sw->key = NULL;
1879 } else {
1880 sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
1881 if (!sw->key)
1882 ret = -ENOMEM;
1883 }
1884 }
1885
1886 mutex_unlock(&sw->tb->lock);
1887 return ret;
1888}
1889static DEVICE_ATTR(key, 0600, key_show, key_store);
1890
1891static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
1892 char *buf)
1893{
1894 struct tb_switch *sw = tb_to_switch(dev);
1895
1896 return sysfs_emit(buf, "%u.0 Gb/s\n", sw->link_speed);
1897}
1898
1899/*
1900 * Currently all lanes must run at the same speed but we expose here
1901 * both directions to allow possible asymmetric links in the future.
1902 */
1903static DEVICE_ATTR(rx_speed, 0444, speed_show, NULL);
1904static DEVICE_ATTR(tx_speed, 0444, speed_show, NULL);
1905
1906static ssize_t lanes_show(struct device *dev, struct device_attribute *attr,
1907 char *buf)
1908{
1909 struct tb_switch *sw = tb_to_switch(dev);
1910
1911 return sysfs_emit(buf, "%u\n", sw->link_width);
1912}
1913
1914/*
1915 * Currently link has same amount of lanes both directions (1 or 2) but
1916 * expose them separately to allow possible asymmetric links in the future.
1917 */
1918static DEVICE_ATTR(rx_lanes, 0444, lanes_show, NULL);
1919static DEVICE_ATTR(tx_lanes, 0444, lanes_show, NULL);
1920
1921static ssize_t nvm_authenticate_show(struct device *dev,
1922 struct device_attribute *attr, char *buf)
1923{
1924 struct tb_switch *sw = tb_to_switch(dev);
1925 u32 status;
1926
1927 nvm_get_auth_status(sw, &status);
1928 return sysfs_emit(buf, "%#x\n", status);
1929}
1930
1931static ssize_t nvm_authenticate_sysfs(struct device *dev, const char *buf,
1932 bool disconnect)
1933{
1934 struct tb_switch *sw = tb_to_switch(dev);
1935 int val, ret;
1936
1937 pm_runtime_get_sync(&sw->dev);
1938
1939 if (!mutex_trylock(&sw->tb->lock)) {
1940 ret = restart_syscall();
1941 goto exit_rpm;
1942 }
1943
1944 if (sw->no_nvm_upgrade) {
1945 ret = -EOPNOTSUPP;
1946 goto exit_unlock;
1947 }
1948
1949 /* If NVMem devices are not yet added */
1950 if (!sw->nvm) {
1951 ret = -EAGAIN;
1952 goto exit_unlock;
1953 }
1954
1955 ret = kstrtoint(buf, 10, &val);
1956 if (ret)
1957 goto exit_unlock;
1958
1959 /* Always clear the authentication status */
1960 nvm_clear_auth_status(sw);
1961
1962 if (val > 0) {
1963 if (val == AUTHENTICATE_ONLY) {
1964 if (disconnect)
1965 ret = -EINVAL;
1966 else
1967 ret = nvm_authenticate(sw, true);
1968 } else {
1969 if (!sw->nvm->flushed) {
1970 if (!sw->nvm->buf) {
1971 ret = -EINVAL;
1972 goto exit_unlock;
1973 }
1974
1975 ret = nvm_validate_and_write(sw);
1976 if (ret || val == WRITE_ONLY)
1977 goto exit_unlock;
1978 }
1979 if (val == WRITE_AND_AUTHENTICATE) {
1980 if (disconnect)
1981 ret = tb_lc_force_power(sw);
1982 else
1983 ret = nvm_authenticate(sw, false);
1984 }
1985 }
1986 }
1987
1988exit_unlock:
1989 mutex_unlock(&sw->tb->lock);
1990exit_rpm:
1991 pm_runtime_mark_last_busy(&sw->dev);
1992 pm_runtime_put_autosuspend(&sw->dev);
1993
1994 return ret;
1995}
1996
1997static ssize_t nvm_authenticate_store(struct device *dev,
1998 struct device_attribute *attr, const char *buf, size_t count)
1999{
2000 int ret = nvm_authenticate_sysfs(dev, buf, false);
2001 if (ret)
2002 return ret;
2003 return count;
2004}
2005static DEVICE_ATTR_RW(nvm_authenticate);
2006
2007static ssize_t nvm_authenticate_on_disconnect_show(struct device *dev,
2008 struct device_attribute *attr, char *buf)
2009{
2010 return nvm_authenticate_show(dev, attr, buf);
2011}
2012
2013static ssize_t nvm_authenticate_on_disconnect_store(struct device *dev,
2014 struct device_attribute *attr, const char *buf, size_t count)
2015{
2016 int ret;
2017
2018 ret = nvm_authenticate_sysfs(dev, buf, true);
2019 return ret ? ret : count;
2020}
2021static DEVICE_ATTR_RW(nvm_authenticate_on_disconnect);
2022
2023static ssize_t nvm_version_show(struct device *dev,
2024 struct device_attribute *attr, char *buf)
2025{
2026 struct tb_switch *sw = tb_to_switch(dev);
2027 int ret;
2028
2029 if (!mutex_trylock(&sw->tb->lock))
2030 return restart_syscall();
2031
2032 if (sw->safe_mode)
2033 ret = -ENODATA;
2034 else if (!sw->nvm)
2035 ret = -EAGAIN;
2036 else
2037 ret = sysfs_emit(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
2038
2039 mutex_unlock(&sw->tb->lock);
2040
2041 return ret;
2042}
2043static DEVICE_ATTR_RO(nvm_version);
2044
2045static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
2046 char *buf)
2047{
2048 struct tb_switch *sw = tb_to_switch(dev);
2049
2050 return sysfs_emit(buf, "%#x\n", sw->vendor);
2051}
2052static DEVICE_ATTR_RO(vendor);
2053
2054static ssize_t
2055vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
2056{
2057 struct tb_switch *sw = tb_to_switch(dev);
2058
2059 return sysfs_emit(buf, "%s\n", sw->vendor_name ?: "");
2060}
2061static DEVICE_ATTR_RO(vendor_name);
2062
2063static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
2064 char *buf)
2065{
2066 struct tb_switch *sw = tb_to_switch(dev);
2067
2068 return sysfs_emit(buf, "%pUb\n", sw->uuid);
2069}
2070static DEVICE_ATTR_RO(unique_id);
2071
2072static struct attribute *switch_attrs[] = {
2073 &dev_attr_authorized.attr,
2074 &dev_attr_boot.attr,
2075 &dev_attr_device.attr,
2076 &dev_attr_device_name.attr,
2077 &dev_attr_generation.attr,
2078 &dev_attr_key.attr,
2079 &dev_attr_nvm_authenticate.attr,
2080 &dev_attr_nvm_authenticate_on_disconnect.attr,
2081 &dev_attr_nvm_version.attr,
2082 &dev_attr_rx_speed.attr,
2083 &dev_attr_rx_lanes.attr,
2084 &dev_attr_tx_speed.attr,
2085 &dev_attr_tx_lanes.attr,
2086 &dev_attr_vendor.attr,
2087 &dev_attr_vendor_name.attr,
2088 &dev_attr_unique_id.attr,
2089 NULL,
2090};
2091
2092static umode_t switch_attr_is_visible(struct kobject *kobj,
2093 struct attribute *attr, int n)
2094{
2095 struct device *dev = kobj_to_dev(kobj);
2096 struct tb_switch *sw = tb_to_switch(dev);
2097
2098 if (attr == &dev_attr_authorized.attr) {
2099 if (sw->tb->security_level == TB_SECURITY_NOPCIE ||
2100 sw->tb->security_level == TB_SECURITY_DPONLY)
2101 return 0;
2102 } else if (attr == &dev_attr_device.attr) {
2103 if (!sw->device)
2104 return 0;
2105 } else if (attr == &dev_attr_device_name.attr) {
2106 if (!sw->device_name)
2107 return 0;
2108 } else if (attr == &dev_attr_vendor.attr) {
2109 if (!sw->vendor)
2110 return 0;
2111 } else if (attr == &dev_attr_vendor_name.attr) {
2112 if (!sw->vendor_name)
2113 return 0;
2114 } else if (attr == &dev_attr_key.attr) {
2115 if (tb_route(sw) &&
2116 sw->tb->security_level == TB_SECURITY_SECURE &&
2117 sw->security_level == TB_SECURITY_SECURE)
2118 return attr->mode;
2119 return 0;
2120 } else if (attr == &dev_attr_rx_speed.attr ||
2121 attr == &dev_attr_rx_lanes.attr ||
2122 attr == &dev_attr_tx_speed.attr ||
2123 attr == &dev_attr_tx_lanes.attr) {
2124 if (tb_route(sw))
2125 return attr->mode;
2126 return 0;
2127 } else if (attr == &dev_attr_nvm_authenticate.attr) {
2128 if (nvm_upgradeable(sw))
2129 return attr->mode;
2130 return 0;
2131 } else if (attr == &dev_attr_nvm_version.attr) {
2132 if (nvm_readable(sw))
2133 return attr->mode;
2134 return 0;
2135 } else if (attr == &dev_attr_boot.attr) {
2136 if (tb_route(sw))
2137 return attr->mode;
2138 return 0;
2139 } else if (attr == &dev_attr_nvm_authenticate_on_disconnect.attr) {
2140 if (sw->quirks & QUIRK_FORCE_POWER_LINK_CONTROLLER)
2141 return attr->mode;
2142 return 0;
2143 }
2144
2145 return sw->safe_mode ? 0 : attr->mode;
2146}
2147
2148static const struct attribute_group switch_group = {
2149 .is_visible = switch_attr_is_visible,
2150 .attrs = switch_attrs,
2151};
2152
2153static const struct attribute_group *switch_groups[] = {
2154 &switch_group,
2155 NULL,
2156};
2157
2158static void tb_switch_release(struct device *dev)
2159{
2160 struct tb_switch *sw = tb_to_switch(dev);
2161 struct tb_port *port;
2162
2163 dma_port_free(sw->dma_port);
2164
2165 tb_switch_for_each_port(sw, port) {
2166 ida_destroy(&port->in_hopids);
2167 ida_destroy(&port->out_hopids);
2168 }
2169
2170 kfree(sw->uuid);
2171 kfree(sw->device_name);
2172 kfree(sw->vendor_name);
2173 kfree(sw->ports);
2174 kfree(sw->drom);
2175 kfree(sw->key);
2176 kfree(sw);
2177}
2178
2179static int tb_switch_uevent(struct device *dev, struct kobj_uevent_env *env)
2180{
2181 struct tb_switch *sw = tb_to_switch(dev);
2182 const char *type;
2183
2184 if (sw->config.thunderbolt_version == USB4_VERSION_1_0) {
2185 if (add_uevent_var(env, "USB4_VERSION=1.0"))
2186 return -ENOMEM;
2187 }
2188
2189 if (!tb_route(sw)) {
2190 type = "host";
2191 } else {
2192 const struct tb_port *port;
2193 bool hub = false;
2194
2195 /* Device is hub if it has any downstream ports */
2196 tb_switch_for_each_port(sw, port) {
2197 if (!port->disabled && !tb_is_upstream_port(port) &&
2198 tb_port_is_null(port)) {
2199 hub = true;
2200 break;
2201 }
2202 }
2203
2204 type = hub ? "hub" : "device";
2205 }
2206
2207 if (add_uevent_var(env, "USB4_TYPE=%s", type))
2208 return -ENOMEM;
2209 return 0;
2210}
2211
2212/*
2213 * Currently only need to provide the callbacks. Everything else is handled
2214 * in the connection manager.
2215 */
2216static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
2217{
2218 struct tb_switch *sw = tb_to_switch(dev);
2219 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
2220
2221 if (cm_ops->runtime_suspend_switch)
2222 return cm_ops->runtime_suspend_switch(sw);
2223
2224 return 0;
2225}
2226
2227static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
2228{
2229 struct tb_switch *sw = tb_to_switch(dev);
2230 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
2231
2232 if (cm_ops->runtime_resume_switch)
2233 return cm_ops->runtime_resume_switch(sw);
2234 return 0;
2235}
2236
2237static const struct dev_pm_ops tb_switch_pm_ops = {
2238 SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
2239 NULL)
2240};
2241
2242struct device_type tb_switch_type = {
2243 .name = "thunderbolt_device",
2244 .release = tb_switch_release,
2245 .uevent = tb_switch_uevent,
2246 .pm = &tb_switch_pm_ops,
2247};
2248
2249static int tb_switch_get_generation(struct tb_switch *sw)
2250{
2251 switch (sw->config.device_id) {
2252 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
2253 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
2254 case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
2255 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
2256 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
2257 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
2258 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
2259 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
2260 return 1;
2261
2262 case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
2263 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
2264 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
2265 return 2;
2266
2267 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
2268 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
2269 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
2270 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
2271 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
2272 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
2273 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
2274 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
2275 case PCI_DEVICE_ID_INTEL_ICL_NHI0:
2276 case PCI_DEVICE_ID_INTEL_ICL_NHI1:
2277 return 3;
2278
2279 default:
2280 if (tb_switch_is_usb4(sw))
2281 return 4;
2282
2283 /*
2284 * For unknown switches assume generation to be 1 to be
2285 * on the safe side.
2286 */
2287 tb_sw_warn(sw, "unsupported switch device id %#x\n",
2288 sw->config.device_id);
2289 return 1;
2290 }
2291}
2292
2293static bool tb_switch_exceeds_max_depth(const struct tb_switch *sw, int depth)
2294{
2295 int max_depth;
2296
2297 if (tb_switch_is_usb4(sw) ||
2298 (sw->tb->root_switch && tb_switch_is_usb4(sw->tb->root_switch)))
2299 max_depth = USB4_SWITCH_MAX_DEPTH;
2300 else
2301 max_depth = TB_SWITCH_MAX_DEPTH;
2302
2303 return depth > max_depth;
2304}
2305
2306/**
2307 * tb_switch_alloc() - allocate a switch
2308 * @tb: Pointer to the owning domain
2309 * @parent: Parent device for this switch
2310 * @route: Route string for this switch
2311 *
2312 * Allocates and initializes a switch. Will not upload configuration to
2313 * the switch. For that you need to call tb_switch_configure()
2314 * separately. The returned switch should be released by calling
2315 * tb_switch_put().
2316 *
2317 * Return: Pointer to the allocated switch or ERR_PTR() in case of
2318 * failure.
2319 */
2320struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
2321 u64 route)
2322{
2323 struct tb_switch *sw;
2324 int upstream_port;
2325 int i, ret, depth;
2326
2327 /* Unlock the downstream port so we can access the switch below */
2328 if (route) {
2329 struct tb_switch *parent_sw = tb_to_switch(parent);
2330 struct tb_port *down;
2331
2332 down = tb_port_at(route, parent_sw);
2333 tb_port_unlock(down);
2334 }
2335
2336 depth = tb_route_length(route);
2337
2338 upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
2339 if (upstream_port < 0)
2340 return ERR_PTR(upstream_port);
2341
2342 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
2343 if (!sw)
2344 return ERR_PTR(-ENOMEM);
2345
2346 sw->tb = tb;
2347 ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);
2348 if (ret)
2349 goto err_free_sw_ports;
2350
2351 sw->generation = tb_switch_get_generation(sw);
2352
2353 tb_dbg(tb, "current switch config:\n");
2354 tb_dump_switch(tb, sw);
2355
2356 /* configure switch */
2357 sw->config.upstream_port_number = upstream_port;
2358 sw->config.depth = depth;
2359 sw->config.route_hi = upper_32_bits(route);
2360 sw->config.route_lo = lower_32_bits(route);
2361 sw->config.enabled = 0;
2362
2363 /* Make sure we do not exceed maximum topology limit */
2364 if (tb_switch_exceeds_max_depth(sw, depth)) {
2365 ret = -EADDRNOTAVAIL;
2366 goto err_free_sw_ports;
2367 }
2368
2369 /* initialize ports */
2370 sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
2371 GFP_KERNEL);
2372 if (!sw->ports) {
2373 ret = -ENOMEM;
2374 goto err_free_sw_ports;
2375 }
2376
2377 for (i = 0; i <= sw->config.max_port_number; i++) {
2378 /* minimum setup for tb_find_cap and tb_drom_read to work */
2379 sw->ports[i].sw = sw;
2380 sw->ports[i].port = i;
2381
2382 /* Control port does not need HopID allocation */
2383 if (i) {
2384 ida_init(&sw->ports[i].in_hopids);
2385 ida_init(&sw->ports[i].out_hopids);
2386 }
2387 }
2388
2389 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
2390 if (ret > 0)
2391 sw->cap_plug_events = ret;
2392
2393 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_TIME2);
2394 if (ret > 0)
2395 sw->cap_vsec_tmu = ret;
2396
2397 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
2398 if (ret > 0)
2399 sw->cap_lc = ret;
2400
2401 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_CP_LP);
2402 if (ret > 0)
2403 sw->cap_lp = ret;
2404
2405 /* Root switch is always authorized */
2406 if (!route)
2407 sw->authorized = true;
2408
2409 device_initialize(&sw->dev);
2410 sw->dev.parent = parent;
2411 sw->dev.bus = &tb_bus_type;
2412 sw->dev.type = &tb_switch_type;
2413 sw->dev.groups = switch_groups;
2414 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
2415
2416 return sw;
2417
2418err_free_sw_ports:
2419 kfree(sw->ports);
2420 kfree(sw);
2421
2422 return ERR_PTR(ret);
2423}
2424
2425/**
2426 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
2427 * @tb: Pointer to the owning domain
2428 * @parent: Parent device for this switch
2429 * @route: Route string for this switch
2430 *
2431 * This creates a switch in safe mode. This means the switch pretty much
2432 * lacks all capabilities except DMA configuration port before it is
2433 * flashed with a valid NVM firmware.
2434 *
2435 * The returned switch must be released by calling tb_switch_put().
2436 *
2437 * Return: Pointer to the allocated switch or ERR_PTR() in case of failure
2438 */
2439struct tb_switch *
2440tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
2441{
2442 struct tb_switch *sw;
2443
2444 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
2445 if (!sw)
2446 return ERR_PTR(-ENOMEM);
2447
2448 sw->tb = tb;
2449 sw->config.depth = tb_route_length(route);
2450 sw->config.route_hi = upper_32_bits(route);
2451 sw->config.route_lo = lower_32_bits(route);
2452 sw->safe_mode = true;
2453
2454 device_initialize(&sw->dev);
2455 sw->dev.parent = parent;
2456 sw->dev.bus = &tb_bus_type;
2457 sw->dev.type = &tb_switch_type;
2458 sw->dev.groups = switch_groups;
2459 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
2460
2461 return sw;
2462}
2463
2464/**
2465 * tb_switch_configure() - Uploads configuration to the switch
2466 * @sw: Switch to configure
2467 *
2468 * Call this function before the switch is added to the system. It will
2469 * upload configuration to the switch and makes it available for the
2470 * connection manager to use. Can be called to the switch again after
2471 * resume from low power states to re-initialize it.
2472 *
2473 * Return: %0 in case of success and negative errno in case of failure
2474 */
2475int tb_switch_configure(struct tb_switch *sw)
2476{
2477 struct tb *tb = sw->tb;
2478 u64 route;
2479 int ret;
2480
2481 route = tb_route(sw);
2482
2483 tb_dbg(tb, "%s Switch at %#llx (depth: %d, up port: %d)\n",
2484 sw->config.enabled ? "restoring" : "initializing", route,
2485 tb_route_length(route), sw->config.upstream_port_number);
2486
2487 sw->config.enabled = 1;
2488
2489 if (tb_switch_is_usb4(sw)) {
2490 /*
2491 * For USB4 devices, we need to program the CM version
2492 * accordingly so that it knows to expose all the
2493 * additional capabilities.
2494 */
2495 sw->config.cmuv = USB4_VERSION_1_0;
2496 sw->config.plug_events_delay = 0xa;
2497
2498 /* Enumerate the switch */
2499 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2500 ROUTER_CS_1, 4);
2501 if (ret)
2502 return ret;
2503
2504 ret = usb4_switch_setup(sw);
2505 } else {
2506 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
2507 tb_sw_warn(sw, "unknown switch vendor id %#x\n",
2508 sw->config.vendor_id);
2509
2510 if (!sw->cap_plug_events) {
2511 tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
2512 return -ENODEV;
2513 }
2514
2515 /* Enumerate the switch */
2516 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2517 ROUTER_CS_1, 3);
2518 }
2519 if (ret)
2520 return ret;
2521
2522 return tb_plug_events_active(sw, true);
2523}
2524
2525static int tb_switch_set_uuid(struct tb_switch *sw)
2526{
2527 bool uid = false;
2528 u32 uuid[4];
2529 int ret;
2530
2531 if (sw->uuid)
2532 return 0;
2533
2534 if (tb_switch_is_usb4(sw)) {
2535 ret = usb4_switch_read_uid(sw, &sw->uid);
2536 if (ret)
2537 return ret;
2538 uid = true;
2539 } else {
2540 /*
2541 * The newer controllers include fused UUID as part of
2542 * link controller specific registers
2543 */
2544 ret = tb_lc_read_uuid(sw, uuid);
2545 if (ret) {
2546 if (ret != -EINVAL)
2547 return ret;
2548 uid = true;
2549 }
2550 }
2551
2552 if (uid) {
2553 /*
2554 * ICM generates UUID based on UID and fills the upper
2555 * two words with ones. This is not strictly following
2556 * UUID format but we want to be compatible with it so
2557 * we do the same here.
2558 */
2559 uuid[0] = sw->uid & 0xffffffff;
2560 uuid[1] = (sw->uid >> 32) & 0xffffffff;
2561 uuid[2] = 0xffffffff;
2562 uuid[3] = 0xffffffff;
2563 }
2564
2565 sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
2566 if (!sw->uuid)
2567 return -ENOMEM;
2568 return 0;
2569}
2570
2571static int tb_switch_add_dma_port(struct tb_switch *sw)
2572{
2573 u32 status;
2574 int ret;
2575
2576 switch (sw->generation) {
2577 case 2:
2578 /* Only root switch can be upgraded */
2579 if (tb_route(sw))
2580 return 0;
2581
2582 fallthrough;
2583 case 3:
2584 case 4:
2585 ret = tb_switch_set_uuid(sw);
2586 if (ret)
2587 return ret;
2588 break;
2589
2590 default:
2591 /*
2592 * DMA port is the only thing available when the switch
2593 * is in safe mode.
2594 */
2595 if (!sw->safe_mode)
2596 return 0;
2597 break;
2598 }
2599
2600 if (sw->no_nvm_upgrade)
2601 return 0;
2602
2603 if (tb_switch_is_usb4(sw)) {
2604 ret = usb4_switch_nvm_authenticate_status(sw, &status);
2605 if (ret)
2606 return ret;
2607
2608 if (status) {
2609 tb_sw_info(sw, "switch flash authentication failed\n");
2610 nvm_set_auth_status(sw, status);
2611 }
2612
2613 return 0;
2614 }
2615
2616 /* Root switch DMA port requires running firmware */
2617 if (!tb_route(sw) && !tb_switch_is_icm(sw))
2618 return 0;
2619
2620 sw->dma_port = dma_port_alloc(sw);
2621 if (!sw->dma_port)
2622 return 0;
2623
2624 /*
2625 * If there is status already set then authentication failed
2626 * when the dma_port_flash_update_auth() returned. Power cycling
2627 * is not needed (it was done already) so only thing we do here
2628 * is to unblock runtime PM of the root port.
2629 */
2630 nvm_get_auth_status(sw, &status);
2631 if (status) {
2632 if (!tb_route(sw))
2633 nvm_authenticate_complete_dma_port(sw);
2634 return 0;
2635 }
2636
2637 /*
2638 * Check status of the previous flash authentication. If there
2639 * is one we need to power cycle the switch in any case to make
2640 * it functional again.
2641 */
2642 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
2643 if (ret <= 0)
2644 return ret;
2645
2646 /* Now we can allow root port to suspend again */
2647 if (!tb_route(sw))
2648 nvm_authenticate_complete_dma_port(sw);
2649
2650 if (status) {
2651 tb_sw_info(sw, "switch flash authentication failed\n");
2652 nvm_set_auth_status(sw, status);
2653 }
2654
2655 tb_sw_info(sw, "power cycling the switch now\n");
2656 dma_port_power_cycle(sw->dma_port);
2657
2658 /*
2659 * We return error here which causes the switch adding failure.
2660 * It should appear back after power cycle is complete.
2661 */
2662 return -ESHUTDOWN;
2663}
2664
2665static void tb_switch_default_link_ports(struct tb_switch *sw)
2666{
2667 int i;
2668
2669 for (i = 1; i <= sw->config.max_port_number; i++) {
2670 struct tb_port *port = &sw->ports[i];
2671 struct tb_port *subordinate;
2672
2673 if (!tb_port_is_null(port))
2674 continue;
2675
2676 /* Check for the subordinate port */
2677 if (i == sw->config.max_port_number ||
2678 !tb_port_is_null(&sw->ports[i + 1]))
2679 continue;
2680
2681 /* Link them if not already done so (by DROM) */
2682 subordinate = &sw->ports[i + 1];
2683 if (!port->dual_link_port && !subordinate->dual_link_port) {
2684 port->link_nr = 0;
2685 port->dual_link_port = subordinate;
2686 subordinate->link_nr = 1;
2687 subordinate->dual_link_port = port;
2688
2689 tb_sw_dbg(sw, "linked ports %d <-> %d\n",
2690 port->port, subordinate->port);
2691 }
2692 }
2693}
2694
2695static bool tb_switch_lane_bonding_possible(struct tb_switch *sw)
2696{
2697 const struct tb_port *up = tb_upstream_port(sw);
2698
2699 if (!up->dual_link_port || !up->dual_link_port->remote)
2700 return false;
2701
2702 if (tb_switch_is_usb4(sw))
2703 return usb4_switch_lane_bonding_possible(sw);
2704 return tb_lc_lane_bonding_possible(sw);
2705}
2706
2707static int tb_switch_update_link_attributes(struct tb_switch *sw)
2708{
2709 struct tb_port *up;
2710 bool change = false;
2711 int ret;
2712
2713 if (!tb_route(sw) || tb_switch_is_icm(sw))
2714 return 0;
2715
2716 up = tb_upstream_port(sw);
2717
2718 ret = tb_port_get_link_speed(up);
2719 if (ret < 0)
2720 return ret;
2721 if (sw->link_speed != ret)
2722 change = true;
2723 sw->link_speed = ret;
2724
2725 ret = tb_port_get_link_width(up);
2726 if (ret < 0)
2727 return ret;
2728 if (sw->link_width != ret)
2729 change = true;
2730 sw->link_width = ret;
2731
2732 /* Notify userspace that there is possible link attribute change */
2733 if (device_is_registered(&sw->dev) && change)
2734 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
2735
2736 return 0;
2737}
2738
2739/**
2740 * tb_switch_lane_bonding_enable() - Enable lane bonding
2741 * @sw: Switch to enable lane bonding
2742 *
2743 * Connection manager can call this function to enable lane bonding of a
2744 * switch. If conditions are correct and both switches support the feature,
2745 * lanes are bonded. It is safe to call this to any switch.
2746 */
2747int tb_switch_lane_bonding_enable(struct tb_switch *sw)
2748{
2749 struct tb_switch *parent = tb_to_switch(sw->dev.parent);
2750 struct tb_port *up, *down;
2751 u64 route = tb_route(sw);
2752 int ret;
2753
2754 if (!route)
2755 return 0;
2756
2757 if (!tb_switch_lane_bonding_possible(sw))
2758 return 0;
2759
2760 up = tb_upstream_port(sw);
2761 down = tb_port_at(route, parent);
2762
2763 if (!tb_port_is_width_supported(up, 2) ||
2764 !tb_port_is_width_supported(down, 2))
2765 return 0;
2766
2767 ret = tb_port_lane_bonding_enable(up);
2768 if (ret) {
2769 tb_port_warn(up, "failed to enable lane bonding\n");
2770 return ret;
2771 }
2772
2773 ret = tb_port_lane_bonding_enable(down);
2774 if (ret) {
2775 tb_port_warn(down, "failed to enable lane bonding\n");
2776 tb_port_lane_bonding_disable(up);
2777 return ret;
2778 }
2779
2780 ret = tb_port_wait_for_link_width(down, 2, 100);
2781 if (ret) {
2782 tb_port_warn(down, "timeout enabling lane bonding\n");
2783 return ret;
2784 }
2785
2786 tb_port_update_credits(down);
2787 tb_port_update_credits(up);
2788 tb_switch_update_link_attributes(sw);
2789
2790 tb_sw_dbg(sw, "lane bonding enabled\n");
2791 return ret;
2792}
2793
2794/**
2795 * tb_switch_lane_bonding_disable() - Disable lane bonding
2796 * @sw: Switch whose lane bonding to disable
2797 *
2798 * Disables lane bonding between @sw and parent. This can be called even
2799 * if lanes were not bonded originally.
2800 */
2801void tb_switch_lane_bonding_disable(struct tb_switch *sw)
2802{
2803 struct tb_switch *parent = tb_to_switch(sw->dev.parent);
2804 struct tb_port *up, *down;
2805
2806 if (!tb_route(sw))
2807 return;
2808
2809 up = tb_upstream_port(sw);
2810 if (!up->bonded)
2811 return;
2812
2813 down = tb_port_at(tb_route(sw), parent);
2814
2815 tb_port_lane_bonding_disable(up);
2816 tb_port_lane_bonding_disable(down);
2817
2818 /*
2819 * It is fine if we get other errors as the router might have
2820 * been unplugged.
2821 */
2822 if (tb_port_wait_for_link_width(down, 1, 100) == -ETIMEDOUT)
2823 tb_sw_warn(sw, "timeout disabling lane bonding\n");
2824
2825 tb_port_update_credits(down);
2826 tb_port_update_credits(up);
2827 tb_switch_update_link_attributes(sw);
2828
2829 tb_sw_dbg(sw, "lane bonding disabled\n");
2830}
2831
2832/**
2833 * tb_switch_configure_link() - Set link configured
2834 * @sw: Switch whose link is configured
2835 *
2836 * Sets the link upstream from @sw configured (from both ends) so that
2837 * it will not be disconnected when the domain exits sleep. Can be
2838 * called for any switch.
2839 *
2840 * It is recommended that this is called after lane bonding is enabled.
2841 *
2842 * Returns %0 on success and negative errno in case of error.
2843 */
2844int tb_switch_configure_link(struct tb_switch *sw)
2845{
2846 struct tb_port *up, *down;
2847 int ret;
2848
2849 if (!tb_route(sw) || tb_switch_is_icm(sw))
2850 return 0;
2851
2852 up = tb_upstream_port(sw);
2853 if (tb_switch_is_usb4(up->sw))
2854 ret = usb4_port_configure(up);
2855 else
2856 ret = tb_lc_configure_port(up);
2857 if (ret)
2858 return ret;
2859
2860 down = up->remote;
2861 if (tb_switch_is_usb4(down->sw))
2862 return usb4_port_configure(down);
2863 return tb_lc_configure_port(down);
2864}
2865
2866/**
2867 * tb_switch_unconfigure_link() - Unconfigure link
2868 * @sw: Switch whose link is unconfigured
2869 *
2870 * Sets the link unconfigured so the @sw will be disconnected if the
2871 * domain exists sleep.
2872 */
2873void tb_switch_unconfigure_link(struct tb_switch *sw)
2874{
2875 struct tb_port *up, *down;
2876
2877 if (sw->is_unplugged)
2878 return;
2879 if (!tb_route(sw) || tb_switch_is_icm(sw))
2880 return;
2881
2882 up = tb_upstream_port(sw);
2883 if (tb_switch_is_usb4(up->sw))
2884 usb4_port_unconfigure(up);
2885 else
2886 tb_lc_unconfigure_port(up);
2887
2888 down = up->remote;
2889 if (tb_switch_is_usb4(down->sw))
2890 usb4_port_unconfigure(down);
2891 else
2892 tb_lc_unconfigure_port(down);
2893}
2894
2895static void tb_switch_credits_init(struct tb_switch *sw)
2896{
2897 if (tb_switch_is_icm(sw))
2898 return;
2899 if (!tb_switch_is_usb4(sw))
2900 return;
2901 if (usb4_switch_credits_init(sw))
2902 tb_sw_info(sw, "failed to determine preferred buffer allocation, using defaults\n");
2903}
2904
2905static int tb_switch_port_hotplug_enable(struct tb_switch *sw)
2906{
2907 struct tb_port *port;
2908
2909 if (tb_switch_is_icm(sw))
2910 return 0;
2911
2912 tb_switch_for_each_port(sw, port) {
2913 int res;
2914
2915 if (!port->cap_usb4)
2916 continue;
2917
2918 res = usb4_port_hotplug_enable(port);
2919 if (res)
2920 return res;
2921 }
2922 return 0;
2923}
2924
2925/**
2926 * tb_switch_add() - Add a switch to the domain
2927 * @sw: Switch to add
2928 *
2929 * This is the last step in adding switch to the domain. It will read
2930 * identification information from DROM and initializes ports so that
2931 * they can be used to connect other switches. The switch will be
2932 * exposed to the userspace when this function successfully returns. To
2933 * remove and release the switch, call tb_switch_remove().
2934 *
2935 * Return: %0 in case of success and negative errno in case of failure
2936 */
2937int tb_switch_add(struct tb_switch *sw)
2938{
2939 int i, ret;
2940
2941 /*
2942 * Initialize DMA control port now before we read DROM. Recent
2943 * host controllers have more complete DROM on NVM that includes
2944 * vendor and model identification strings which we then expose
2945 * to the userspace. NVM can be accessed through DMA
2946 * configuration based mailbox.
2947 */
2948 ret = tb_switch_add_dma_port(sw);
2949 if (ret) {
2950 dev_err(&sw->dev, "failed to add DMA port\n");
2951 return ret;
2952 }
2953
2954 if (!sw->safe_mode) {
2955 tb_switch_credits_init(sw);
2956
2957 /* read drom */
2958 ret = tb_drom_read(sw);
2959 if (ret)
2960 dev_warn(&sw->dev, "reading DROM failed: %d\n", ret);
2961 tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
2962
2963 tb_check_quirks(sw);
2964
2965 ret = tb_switch_set_uuid(sw);
2966 if (ret) {
2967 dev_err(&sw->dev, "failed to set UUID\n");
2968 return ret;
2969 }
2970
2971 for (i = 0; i <= sw->config.max_port_number; i++) {
2972 if (sw->ports[i].disabled) {
2973 tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
2974 continue;
2975 }
2976 ret = tb_init_port(&sw->ports[i]);
2977 if (ret) {
2978 dev_err(&sw->dev, "failed to initialize port %d\n", i);
2979 return ret;
2980 }
2981 }
2982
2983 tb_switch_default_link_ports(sw);
2984
2985 ret = tb_switch_update_link_attributes(sw);
2986 if (ret)
2987 return ret;
2988
2989 ret = tb_switch_tmu_init(sw);
2990 if (ret)
2991 return ret;
2992 }
2993
2994 ret = tb_switch_port_hotplug_enable(sw);
2995 if (ret)
2996 return ret;
2997
2998 ret = device_add(&sw->dev);
2999 if (ret) {
3000 dev_err(&sw->dev, "failed to add device: %d\n", ret);
3001 return ret;
3002 }
3003
3004 if (tb_route(sw)) {
3005 dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
3006 sw->vendor, sw->device);
3007 if (sw->vendor_name && sw->device_name)
3008 dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
3009 sw->device_name);
3010 }
3011
3012 ret = usb4_switch_add_ports(sw);
3013 if (ret) {
3014 dev_err(&sw->dev, "failed to add USB4 ports\n");
3015 goto err_del;
3016 }
3017
3018 ret = tb_switch_nvm_add(sw);
3019 if (ret) {
3020 dev_err(&sw->dev, "failed to add NVM devices\n");
3021 goto err_ports;
3022 }
3023
3024 /*
3025 * Thunderbolt routers do not generate wakeups themselves but
3026 * they forward wakeups from tunneled protocols, so enable it
3027 * here.
3028 */
3029 device_init_wakeup(&sw->dev, true);
3030
3031 pm_runtime_set_active(&sw->dev);
3032 if (sw->rpm) {
3033 pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
3034 pm_runtime_use_autosuspend(&sw->dev);
3035 pm_runtime_mark_last_busy(&sw->dev);
3036 pm_runtime_enable(&sw->dev);
3037 pm_request_autosuspend(&sw->dev);
3038 }
3039
3040 tb_switch_debugfs_init(sw);
3041 return 0;
3042
3043err_ports:
3044 usb4_switch_remove_ports(sw);
3045err_del:
3046 device_del(&sw->dev);
3047
3048 return ret;
3049}
3050
3051/**
3052 * tb_switch_remove() - Remove and release a switch
3053 * @sw: Switch to remove
3054 *
3055 * This will remove the switch from the domain and release it after last
3056 * reference count drops to zero. If there are switches connected below
3057 * this switch, they will be removed as well.
3058 */
3059void tb_switch_remove(struct tb_switch *sw)
3060{
3061 struct tb_port *port;
3062
3063 tb_switch_debugfs_remove(sw);
3064
3065 if (sw->rpm) {
3066 pm_runtime_get_sync(&sw->dev);
3067 pm_runtime_disable(&sw->dev);
3068 }
3069
3070 /* port 0 is the switch itself and never has a remote */
3071 tb_switch_for_each_port(sw, port) {
3072 if (tb_port_has_remote(port)) {
3073 tb_switch_remove(port->remote->sw);
3074 port->remote = NULL;
3075 } else if (port->xdomain) {
3076 tb_xdomain_remove(port->xdomain);
3077 port->xdomain = NULL;
3078 }
3079
3080 /* Remove any downstream retimers */
3081 tb_retimer_remove_all(port);
3082 }
3083
3084 if (!sw->is_unplugged)
3085 tb_plug_events_active(sw, false);
3086
3087 tb_switch_nvm_remove(sw);
3088 usb4_switch_remove_ports(sw);
3089
3090 if (tb_route(sw))
3091 dev_info(&sw->dev, "device disconnected\n");
3092 device_unregister(&sw->dev);
3093}
3094
3095/**
3096 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
3097 * @sw: Router to mark unplugged
3098 */
3099void tb_sw_set_unplugged(struct tb_switch *sw)
3100{
3101 struct tb_port *port;
3102
3103 if (sw == sw->tb->root_switch) {
3104 tb_sw_WARN(sw, "cannot unplug root switch\n");
3105 return;
3106 }
3107 if (sw->is_unplugged) {
3108 tb_sw_WARN(sw, "is_unplugged already set\n");
3109 return;
3110 }
3111 sw->is_unplugged = true;
3112 tb_switch_for_each_port(sw, port) {
3113 if (tb_port_has_remote(port))
3114 tb_sw_set_unplugged(port->remote->sw);
3115 else if (port->xdomain)
3116 port->xdomain->is_unplugged = true;
3117 }
3118}
3119
3120static int tb_switch_set_wake(struct tb_switch *sw, unsigned int flags)
3121{
3122 if (flags)
3123 tb_sw_dbg(sw, "enabling wakeup: %#x\n", flags);
3124 else
3125 tb_sw_dbg(sw, "disabling wakeup\n");
3126
3127 if (tb_switch_is_usb4(sw))
3128 return usb4_switch_set_wake(sw, flags);
3129 return tb_lc_set_wake(sw, flags);
3130}
3131
3132int tb_switch_resume(struct tb_switch *sw)
3133{
3134 struct tb_port *port;
3135 int err;
3136
3137 tb_sw_dbg(sw, "resuming switch\n");
3138
3139 /*
3140 * Check for UID of the connected switches except for root
3141 * switch which we assume cannot be removed.
3142 */
3143 if (tb_route(sw)) {
3144 u64 uid;
3145
3146 /*
3147 * Check first that we can still read the switch config
3148 * space. It may be that there is now another domain
3149 * connected.
3150 */
3151 err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
3152 if (err < 0) {
3153 tb_sw_info(sw, "switch not present anymore\n");
3154 return err;
3155 }
3156
3157 /* We don't have any way to confirm this was the same device */
3158 if (!sw->uid)
3159 return -ENODEV;
3160
3161 if (tb_switch_is_usb4(sw))
3162 err = usb4_switch_read_uid(sw, &uid);
3163 else
3164 err = tb_drom_read_uid_only(sw, &uid);
3165 if (err) {
3166 tb_sw_warn(sw, "uid read failed\n");
3167 return err;
3168 }
3169 if (sw->uid != uid) {
3170 tb_sw_info(sw,
3171 "changed while suspended (uid %#llx -> %#llx)\n",
3172 sw->uid, uid);
3173 return -ENODEV;
3174 }
3175 }
3176
3177 err = tb_switch_configure(sw);
3178 if (err)
3179 return err;
3180
3181 /* Disable wakes */
3182 tb_switch_set_wake(sw, 0);
3183
3184 err = tb_switch_tmu_init(sw);
3185 if (err)
3186 return err;
3187
3188 /* check for surviving downstream switches */
3189 tb_switch_for_each_port(sw, port) {
3190 if (!tb_port_is_null(port))
3191 continue;
3192
3193 if (!tb_port_resume(port))
3194 continue;
3195
3196 if (tb_wait_for_port(port, true) <= 0) {
3197 tb_port_warn(port,
3198 "lost during suspend, disconnecting\n");
3199 if (tb_port_has_remote(port))
3200 tb_sw_set_unplugged(port->remote->sw);
3201 else if (port->xdomain)
3202 port->xdomain->is_unplugged = true;
3203 } else {
3204 /*
3205 * Always unlock the port so the downstream
3206 * switch/domain is accessible.
3207 */
3208 if (tb_port_unlock(port))
3209 tb_port_warn(port, "failed to unlock port\n");
3210 if (port->remote && tb_switch_resume(port->remote->sw)) {
3211 tb_port_warn(port,
3212 "lost during suspend, disconnecting\n");
3213 tb_sw_set_unplugged(port->remote->sw);
3214 }
3215 }
3216 }
3217 return 0;
3218}
3219
3220/**
3221 * tb_switch_suspend() - Put a switch to sleep
3222 * @sw: Switch to suspend
3223 * @runtime: Is this runtime suspend or system sleep
3224 *
3225 * Suspends router and all its children. Enables wakes according to
3226 * value of @runtime and then sets sleep bit for the router. If @sw is
3227 * host router the domain is ready to go to sleep once this function
3228 * returns.
3229 */
3230void tb_switch_suspend(struct tb_switch *sw, bool runtime)
3231{
3232 unsigned int flags = 0;
3233 struct tb_port *port;
3234 int err;
3235
3236 tb_sw_dbg(sw, "suspending switch\n");
3237
3238 /*
3239 * Actually only needed for Titan Ridge but for simplicity can be
3240 * done for USB4 device too as CLx is re-enabled at resume.
3241 * CL0s and CL1 are enabled and supported together.
3242 */
3243 if (tb_switch_is_clx_enabled(sw, TB_CL1)) {
3244 if (tb_switch_disable_clx(sw, TB_CL1))
3245 tb_sw_warn(sw, "failed to disable %s on upstream port\n",
3246 tb_switch_clx_name(TB_CL1));
3247 }
3248
3249 err = tb_plug_events_active(sw, false);
3250 if (err)
3251 return;
3252
3253 tb_switch_for_each_port(sw, port) {
3254 if (tb_port_has_remote(port))
3255 tb_switch_suspend(port->remote->sw, runtime);
3256 }
3257
3258 if (runtime) {
3259 /* Trigger wake when something is plugged in/out */
3260 flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT;
3261 flags |= TB_WAKE_ON_USB4;
3262 flags |= TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE | TB_WAKE_ON_DP;
3263 } else if (device_may_wakeup(&sw->dev)) {
3264 flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;
3265 }
3266
3267 tb_switch_set_wake(sw, flags);
3268
3269 if (tb_switch_is_usb4(sw))
3270 usb4_switch_set_sleep(sw);
3271 else
3272 tb_lc_set_sleep(sw);
3273}
3274
3275/**
3276 * tb_switch_query_dp_resource() - Query availability of DP resource
3277 * @sw: Switch whose DP resource is queried
3278 * @in: DP IN port
3279 *
3280 * Queries availability of DP resource for DP tunneling using switch
3281 * specific means. Returns %true if resource is available.
3282 */
3283bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in)
3284{
3285 if (tb_switch_is_usb4(sw))
3286 return usb4_switch_query_dp_resource(sw, in);
3287 return tb_lc_dp_sink_query(sw, in);
3288}
3289
3290/**
3291 * tb_switch_alloc_dp_resource() - Allocate available DP resource
3292 * @sw: Switch whose DP resource is allocated
3293 * @in: DP IN port
3294 *
3295 * Allocates DP resource for DP tunneling. The resource must be
3296 * available for this to succeed (see tb_switch_query_dp_resource()).
3297 * Returns %0 in success and negative errno otherwise.
3298 */
3299int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
3300{
3301 int ret;
3302
3303 if (tb_switch_is_usb4(sw))
3304 ret = usb4_switch_alloc_dp_resource(sw, in);
3305 else
3306 ret = tb_lc_dp_sink_alloc(sw, in);
3307
3308 if (ret)
3309 tb_sw_warn(sw, "failed to allocate DP resource for port %d\n",
3310 in->port);
3311 else
3312 tb_sw_dbg(sw, "allocated DP resource for port %d\n", in->port);
3313
3314 return ret;
3315}
3316
3317/**
3318 * tb_switch_dealloc_dp_resource() - De-allocate DP resource
3319 * @sw: Switch whose DP resource is de-allocated
3320 * @in: DP IN port
3321 *
3322 * De-allocates DP resource that was previously allocated for DP
3323 * tunneling.
3324 */
3325void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
3326{
3327 int ret;
3328
3329 if (tb_switch_is_usb4(sw))
3330 ret = usb4_switch_dealloc_dp_resource(sw, in);
3331 else
3332 ret = tb_lc_dp_sink_dealloc(sw, in);
3333
3334 if (ret)
3335 tb_sw_warn(sw, "failed to de-allocate DP resource for port %d\n",
3336 in->port);
3337 else
3338 tb_sw_dbg(sw, "released DP resource for port %d\n", in->port);
3339}
3340
3341struct tb_sw_lookup {
3342 struct tb *tb;
3343 u8 link;
3344 u8 depth;
3345 const uuid_t *uuid;
3346 u64 route;
3347};
3348
3349static int tb_switch_match(struct device *dev, const void *data)
3350{
3351 struct tb_switch *sw = tb_to_switch(dev);
3352 const struct tb_sw_lookup *lookup = data;
3353
3354 if (!sw)
3355 return 0;
3356 if (sw->tb != lookup->tb)
3357 return 0;
3358
3359 if (lookup->uuid)
3360 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
3361
3362 if (lookup->route) {
3363 return sw->config.route_lo == lower_32_bits(lookup->route) &&
3364 sw->config.route_hi == upper_32_bits(lookup->route);
3365 }
3366
3367 /* Root switch is matched only by depth */
3368 if (!lookup->depth)
3369 return !sw->depth;
3370
3371 return sw->link == lookup->link && sw->depth == lookup->depth;
3372}
3373
3374/**
3375 * tb_switch_find_by_link_depth() - Find switch by link and depth
3376 * @tb: Domain the switch belongs
3377 * @link: Link number the switch is connected
3378 * @depth: Depth of the switch in link
3379 *
3380 * Returned switch has reference count increased so the caller needs to
3381 * call tb_switch_put() when done with the switch.
3382 */
3383struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
3384{
3385 struct tb_sw_lookup lookup;
3386 struct device *dev;
3387
3388 memset(&lookup, 0, sizeof(lookup));
3389 lookup.tb = tb;
3390 lookup.link = link;
3391 lookup.depth = depth;
3392
3393 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3394 if (dev)
3395 return tb_to_switch(dev);
3396
3397 return NULL;
3398}
3399
3400/**
3401 * tb_switch_find_by_uuid() - Find switch by UUID
3402 * @tb: Domain the switch belongs
3403 * @uuid: UUID to look for
3404 *
3405 * Returned switch has reference count increased so the caller needs to
3406 * call tb_switch_put() when done with the switch.
3407 */
3408struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
3409{
3410 struct tb_sw_lookup lookup;
3411 struct device *dev;
3412
3413 memset(&lookup, 0, sizeof(lookup));
3414 lookup.tb = tb;
3415 lookup.uuid = uuid;
3416
3417 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3418 if (dev)
3419 return tb_to_switch(dev);
3420
3421 return NULL;
3422}
3423
3424/**
3425 * tb_switch_find_by_route() - Find switch by route string
3426 * @tb: Domain the switch belongs
3427 * @route: Route string to look for
3428 *
3429 * Returned switch has reference count increased so the caller needs to
3430 * call tb_switch_put() when done with the switch.
3431 */
3432struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
3433{
3434 struct tb_sw_lookup lookup;
3435 struct device *dev;
3436
3437 if (!route)
3438 return tb_switch_get(tb->root_switch);
3439
3440 memset(&lookup, 0, sizeof(lookup));
3441 lookup.tb = tb;
3442 lookup.route = route;
3443
3444 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3445 if (dev)
3446 return tb_to_switch(dev);
3447
3448 return NULL;
3449}
3450
3451/**
3452 * tb_switch_find_port() - return the first port of @type on @sw or NULL
3453 * @sw: Switch to find the port from
3454 * @type: Port type to look for
3455 */
3456struct tb_port *tb_switch_find_port(struct tb_switch *sw,
3457 enum tb_port_type type)
3458{
3459 struct tb_port *port;
3460
3461 tb_switch_for_each_port(sw, port) {
3462 if (port->config.type == type)
3463 return port;
3464 }
3465
3466 return NULL;
3467}
3468
3469static int tb_switch_pm_secondary_resolve(struct tb_switch *sw)
3470{
3471 struct tb_switch *parent = tb_switch_parent(sw);
3472 struct tb_port *up, *down;
3473 int ret;
3474
3475 if (!tb_route(sw))
3476 return 0;
3477
3478 up = tb_upstream_port(sw);
3479 down = tb_port_at(tb_route(sw), parent);
3480 ret = tb_port_pm_secondary_enable(up);
3481 if (ret)
3482 return ret;
3483
3484 return tb_port_pm_secondary_disable(down);
3485}
3486
3487static int __tb_switch_enable_clx(struct tb_switch *sw, enum tb_clx clx)
3488{
3489 struct tb_switch *parent = tb_switch_parent(sw);
3490 bool up_clx_support, down_clx_support;
3491 struct tb_port *up, *down;
3492 int ret;
3493
3494 if (!tb_switch_is_clx_supported(sw))
3495 return 0;
3496
3497 /*
3498 * Enable CLx for host router's downstream port as part of the
3499 * downstream router enabling procedure.
3500 */
3501 if (!tb_route(sw))
3502 return 0;
3503
3504 /* Enable CLx only for first hop router (depth = 1) */
3505 if (tb_route(parent))
3506 return 0;
3507
3508 ret = tb_switch_pm_secondary_resolve(sw);
3509 if (ret)
3510 return ret;
3511
3512 up = tb_upstream_port(sw);
3513 down = tb_port_at(tb_route(sw), parent);
3514
3515 up_clx_support = tb_port_clx_supported(up, clx);
3516 down_clx_support = tb_port_clx_supported(down, clx);
3517
3518 tb_port_dbg(up, "%s %ssupported\n", tb_switch_clx_name(clx),
3519 up_clx_support ? "" : "not ");
3520 tb_port_dbg(down, "%s %ssupported\n", tb_switch_clx_name(clx),
3521 down_clx_support ? "" : "not ");
3522
3523 if (!up_clx_support || !down_clx_support)
3524 return -EOPNOTSUPP;
3525
3526 ret = tb_port_clx_enable(up, clx);
3527 if (ret)
3528 return ret;
3529
3530 ret = tb_port_clx_enable(down, clx);
3531 if (ret) {
3532 tb_port_clx_disable(up, clx);
3533 return ret;
3534 }
3535
3536 ret = tb_switch_mask_clx_objections(sw);
3537 if (ret) {
3538 tb_port_clx_disable(up, clx);
3539 tb_port_clx_disable(down, clx);
3540 return ret;
3541 }
3542
3543 sw->clx = clx;
3544
3545 tb_port_dbg(up, "%s enabled\n", tb_switch_clx_name(clx));
3546 return 0;
3547}
3548
3549/**
3550 * tb_switch_enable_clx() - Enable CLx on upstream port of specified router
3551 * @sw: Router to enable CLx for
3552 * @clx: The CLx state to enable
3553 *
3554 * Enable CLx state only for first hop router. That is the most common
3555 * use-case, that is intended for better thermal management, and so helps
3556 * to improve performance. CLx is enabled only if both sides of the link
3557 * support CLx, and if both sides of the link are not configured as two
3558 * single lane links and only if the link is not inter-domain link. The
3559 * complete set of conditions is described in CM Guide 1.0 section 8.1.
3560 *
3561 * Return: Returns 0 on success or an error code on failure.
3562 */
3563int tb_switch_enable_clx(struct tb_switch *sw, enum tb_clx clx)
3564{
3565 struct tb_switch *root_sw = sw->tb->root_switch;
3566
3567 if (!clx_enabled)
3568 return 0;
3569
3570 /*
3571 * CLx is not enabled and validated on Intel USB4 platforms before
3572 * Alder Lake.
3573 */
3574 if (root_sw->generation < 4 || tb_switch_is_tiger_lake(root_sw))
3575 return 0;
3576
3577 switch (clx) {
3578 case TB_CL1:
3579 /* CL0s and CL1 are enabled and supported together */
3580 return __tb_switch_enable_clx(sw, clx);
3581
3582 default:
3583 return -EOPNOTSUPP;
3584 }
3585}
3586
3587static int __tb_switch_disable_clx(struct tb_switch *sw, enum tb_clx clx)
3588{
3589 struct tb_switch *parent = tb_switch_parent(sw);
3590 struct tb_port *up, *down;
3591 int ret;
3592
3593 if (!tb_switch_is_clx_supported(sw))
3594 return 0;
3595
3596 /*
3597 * Disable CLx for host router's downstream port as part of the
3598 * downstream router enabling procedure.
3599 */
3600 if (!tb_route(sw))
3601 return 0;
3602
3603 /* Disable CLx only for first hop router (depth = 1) */
3604 if (tb_route(parent))
3605 return 0;
3606
3607 up = tb_upstream_port(sw);
3608 down = tb_port_at(tb_route(sw), parent);
3609 ret = tb_port_clx_disable(up, clx);
3610 if (ret)
3611 return ret;
3612
3613 ret = tb_port_clx_disable(down, clx);
3614 if (ret)
3615 return ret;
3616
3617 sw->clx = TB_CLX_DISABLE;
3618
3619 tb_port_dbg(up, "%s disabled\n", tb_switch_clx_name(clx));
3620 return 0;
3621}
3622
3623/**
3624 * tb_switch_disable_clx() - Disable CLx on upstream port of specified router
3625 * @sw: Router to disable CLx for
3626 * @clx: The CLx state to disable
3627 *
3628 * Return: Returns 0 on success or an error code on failure.
3629 */
3630int tb_switch_disable_clx(struct tb_switch *sw, enum tb_clx clx)
3631{
3632 if (!clx_enabled)
3633 return 0;
3634
3635 switch (clx) {
3636 case TB_CL1:
3637 /* CL0s and CL1 are enabled and supported together */
3638 return __tb_switch_disable_clx(sw, clx);
3639
3640 default:
3641 return -EOPNOTSUPP;
3642 }
3643}
3644
3645/**
3646 * tb_switch_mask_clx_objections() - Mask CLx objections for a router
3647 * @sw: Router to mask objections for
3648 *
3649 * Mask the objections coming from the second depth routers in order to
3650 * stop these objections from interfering with the CLx states of the first
3651 * depth link.
3652 */
3653int tb_switch_mask_clx_objections(struct tb_switch *sw)
3654{
3655 int up_port = sw->config.upstream_port_number;
3656 u32 offset, val[2], mask_obj, unmask_obj;
3657 int ret, i;
3658
3659 /* Only Titan Ridge of pre-USB4 devices support CLx states */
3660 if (!tb_switch_is_titan_ridge(sw))
3661 return 0;
3662
3663 if (!tb_route(sw))
3664 return 0;
3665
3666 /*
3667 * In Titan Ridge there are only 2 dual-lane Thunderbolt ports:
3668 * Port A consists of lane adapters 1,2 and
3669 * Port B consists of lane adapters 3,4
3670 * If upstream port is A, (lanes are 1,2), we mask objections from
3671 * port B (lanes 3,4) and unmask objections from Port A and vice-versa.
3672 */
3673 if (up_port == 1) {
3674 mask_obj = TB_LOW_PWR_C0_PORT_B_MASK;
3675 unmask_obj = TB_LOW_PWR_C1_PORT_A_MASK;
3676 offset = TB_LOW_PWR_C1_CL1;
3677 } else {
3678 mask_obj = TB_LOW_PWR_C1_PORT_A_MASK;
3679 unmask_obj = TB_LOW_PWR_C0_PORT_B_MASK;
3680 offset = TB_LOW_PWR_C3_CL1;
3681 }
3682
3683 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH,
3684 sw->cap_lp + offset, ARRAY_SIZE(val));
3685 if (ret)
3686 return ret;
3687
3688 for (i = 0; i < ARRAY_SIZE(val); i++) {
3689 val[i] |= mask_obj;
3690 val[i] &= ~unmask_obj;
3691 }
3692
3693 return tb_sw_write(sw, &val, TB_CFG_SWITCH,
3694 sw->cap_lp + offset, ARRAY_SIZE(val));
3695}
3696
3697/*
3698 * Can be used for read/write a specified PCIe bridge for any Thunderbolt 3
3699 * device. For now used only for Titan Ridge.
3700 */
3701static int tb_switch_pcie_bridge_write(struct tb_switch *sw, unsigned int bridge,
3702 unsigned int pcie_offset, u32 value)
3703{
3704 u32 offset, command, val;
3705 int ret;
3706
3707 if (sw->generation != 3)
3708 return -EOPNOTSUPP;
3709
3710 offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_WR_DATA;
3711 ret = tb_sw_write(sw, &value, TB_CFG_SWITCH, offset, 1);
3712 if (ret)
3713 return ret;
3714
3715 command = pcie_offset & TB_PLUG_EVENTS_PCIE_CMD_DW_OFFSET_MASK;
3716 command |= BIT(bridge + TB_PLUG_EVENTS_PCIE_CMD_BR_SHIFT);
3717 command |= TB_PLUG_EVENTS_PCIE_CMD_RD_WR_MASK;
3718 command |= TB_PLUG_EVENTS_PCIE_CMD_COMMAND_VAL
3719 << TB_PLUG_EVENTS_PCIE_CMD_COMMAND_SHIFT;
3720 command |= TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK;
3721
3722 offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_CMD;
3723
3724 ret = tb_sw_write(sw, &command, TB_CFG_SWITCH, offset, 1);
3725 if (ret)
3726 return ret;
3727
3728 ret = tb_switch_wait_for_bit(sw, offset,
3729 TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK, 0, 100);
3730 if (ret)
3731 return ret;
3732
3733 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
3734 if (ret)
3735 return ret;
3736
3737 if (val & TB_PLUG_EVENTS_PCIE_CMD_TIMEOUT_MASK)
3738 return -ETIMEDOUT;
3739
3740 return 0;
3741}
3742
3743/**
3744 * tb_switch_pcie_l1_enable() - Enable PCIe link to enter L1 state
3745 * @sw: Router to enable PCIe L1
3746 *
3747 * For Titan Ridge switch to enter CLx state, its PCIe bridges shall enable
3748 * entry to PCIe L1 state. Shall be called after the upstream PCIe tunnel
3749 * was configured. Due to Intel platforms limitation, shall be called only
3750 * for first hop switch.
3751 */
3752int tb_switch_pcie_l1_enable(struct tb_switch *sw)
3753{
3754 struct tb_switch *parent = tb_switch_parent(sw);
3755 int ret;
3756
3757 if (!tb_route(sw))
3758 return 0;
3759
3760 if (!tb_switch_is_titan_ridge(sw))
3761 return 0;
3762
3763 /* Enable PCIe L1 enable only for first hop router (depth = 1) */
3764 if (tb_route(parent))
3765 return 0;
3766
3767 /* Write to downstream PCIe bridge #5 aka Dn4 */
3768 ret = tb_switch_pcie_bridge_write(sw, 5, 0x143, 0x0c7806b1);
3769 if (ret)
3770 return ret;
3771
3772 /* Write to Upstream PCIe bridge #0 aka Up0 */
3773 return tb_switch_pcie_bridge_write(sw, 0, 0x143, 0x0c5806b1);
3774}
3775
3776/**
3777 * tb_switch_xhci_connect() - Connect internal xHCI
3778 * @sw: Router whose xHCI to connect
3779 *
3780 * Can be called to any router. For Alpine Ridge and Titan Ridge
3781 * performs special flows that bring the xHCI functional for any device
3782 * connected to the type-C port. Call only after PCIe tunnel has been
3783 * established. The function only does the connect if not done already
3784 * so can be called several times for the same router.
3785 */
3786int tb_switch_xhci_connect(struct tb_switch *sw)
3787{
3788 struct tb_port *port1, *port3;
3789 int ret;
3790
3791 if (sw->generation != 3)
3792 return 0;
3793
3794 port1 = &sw->ports[1];
3795 port3 = &sw->ports[3];
3796
3797 if (tb_switch_is_alpine_ridge(sw)) {
3798 bool usb_port1, usb_port3, xhci_port1, xhci_port3;
3799
3800 usb_port1 = tb_lc_is_usb_plugged(port1);
3801 usb_port3 = tb_lc_is_usb_plugged(port3);
3802 xhci_port1 = tb_lc_is_xhci_connected(port1);
3803 xhci_port3 = tb_lc_is_xhci_connected(port3);
3804
3805 /* Figure out correct USB port to connect */
3806 if (usb_port1 && !xhci_port1) {
3807 ret = tb_lc_xhci_connect(port1);
3808 if (ret)
3809 return ret;
3810 }
3811 if (usb_port3 && !xhci_port3)
3812 return tb_lc_xhci_connect(port3);
3813 } else if (tb_switch_is_titan_ridge(sw)) {
3814 ret = tb_lc_xhci_connect(port1);
3815 if (ret)
3816 return ret;
3817 return tb_lc_xhci_connect(port3);
3818 }
3819
3820 return 0;
3821}
3822
3823/**
3824 * tb_switch_xhci_disconnect() - Disconnect internal xHCI
3825 * @sw: Router whose xHCI to disconnect
3826 *
3827 * The opposite of tb_switch_xhci_connect(). Disconnects xHCI on both
3828 * ports.
3829 */
3830void tb_switch_xhci_disconnect(struct tb_switch *sw)
3831{
3832 if (sw->generation == 3) {
3833 struct tb_port *port1 = &sw->ports[1];
3834 struct tb_port *port3 = &sw->ports[3];
3835
3836 tb_lc_xhci_disconnect(port1);
3837 tb_port_dbg(port1, "disconnected xHCI\n");
3838 tb_lc_xhci_disconnect(port3);
3839 tb_port_dbg(port3, "disconnected xHCI\n");
3840 }
3841}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Thunderbolt driver - switch/port utility functions
4 *
5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
6 * Copyright (C) 2018, Intel Corporation
7 */
8
9#include <linux/delay.h>
10#include <linux/idr.h>
11#include <linux/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 information
31 * needs to stay around even when the switch gets power cycled so we
32 * 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 else
118 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 the
132 * existing paths first (in case it is not in safe mode
133 * 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 if
143 * 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 power
151 * 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 the
160 * 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 time
184 * for the device to respond (we get timeout for a while). Once
185 * we get response the device needs to be power cycled in order
186 * 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 to
217 * go into D3cold because some root ports cannot trigger PME
218 * itself. To be on the safe side keep the root port in D0 during
219 * 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 is
240 * optional for hosts. Therefore we query the NVM sector
241 * size here and if it is supported assume NVM
242 * 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 NVM
287 * @sw: Router whose NVM to read
288 * @address: Start address on the NVM
289 * @buf: Buffer where the read data is copied
290 * @size: Size of the buffer in bytes
291 *
292 * Reads from router NVM and returns the requested data in @buf. Locking
293 * is up to the caller. Returns %0 in success and negative errno in case
294 * 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 image
339 * locally here and handle the special cases when the user asks
340 * 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 of
368 * the NVM is the non-active one where userspace is expected to
369 * 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 port
463 * @port: the port to check
464 *
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 ready
485 * @port: Port to wait
486 * @wait_if_unplugged: Wait also when port is unplugged
487 *
488 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
489 * wait_if_unplugged is set then we also wait if the port is in state
490 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
491 * switch resume). Otherwise we only wait if a device is registered but the link
492 * has not yet been established.
493 *
494 * Return: Returns an error code on failure. Returns 0 if the port is not
495 * connected or failed to reach state TB_PORT_UP within one second. Returns 1
496 * 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 some
543 * 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 port
559 * @port: Port to add/remove NFC credits
560 * @credits: Credits to add/remove
561 *
562 * Change the number of NFC credits allocated to @port by @credits. To remove
563 * 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 only
576 * 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_COUNTER
599 * @port: Port whose counters to clear
600 * @counter: Counter index to clear
601 *
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 port
613 * @port: Port to unlock
614 *
615 * Needed for USB4 but can be called for any CIO/USB4 ports. Makes the
616 * 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 else
645 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 adapter
659 * @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 adapter
670 * @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 port
688 *
689 * This is a helper method for tb_switch_alloc. Does not check or initialize
690 * 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 else
723 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 path
731 * can be read from the path config space. Legacy
732 * 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 are
773 * 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 port
786 * @port: Port to allocate HopID for
787 * @min_hopid: Minimum acceptable input HopID
788 * @max_hopid: Maximum acceptable input HopID
789 *
790 * Return: HopID between @min_hopid and @max_hopid or negative errno in
791 * 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 port
800 * @port: Port to allocate HopID for
801 * @min_hopid: Minimum acceptable output HopID
802 * @max_hopid: Maximum acceptable output HopID
803 *
804 * Return: HopID between @min_hopid and @max_hopid or negative errno in
805 * 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 port
814 * @port: Port whose HopID to release
815 * @hopid: HopID to release
816 */
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 port
824 * @port: Port whose HopID to release
825 * @hopid: HopID to release
826 */
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 path
841 * @start: Start port of the walk
842 * @end: End port of the walk
843 * @prev: Previous port (%NULL if this is the first)
844 *
845 * This function can be used to walk from one port to another if they
846 * are connected through zero or more switches. If the @prev is dual
847 * link port, the function follows that link and returns another end on
848 * 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 both
881 * 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 speed
895 * @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 generation
927 * @port: Lane adapter
928 *
929 * Returns link generation as number or negative errno in case of
930 * failure. Does not distinguish between Thunderbolt 1 and Thunderbolt 2
931 * 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 width
953 * @port: Port to check (USB4 or CIO)
954 *
955 * Returns link width. Return the link width as encoded in &enum
956 * 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 supported
978 * @port: Port to check
979 * @width: Widths to check (bitmask)
980 *
981 * Can be called to any lane adapter. Checks if given @width is
982 * 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 is
1005 * 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 adapter
1013 * @port: Lane adapter
1014 * @width: Target link width
1015 *
1016 * Sets the target link width of the lane adapter to @width. Does not
1017 * 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 error
1020 */
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 bonding
1065 * @port: Lane adapter
1066 * @bonding: enable/disable bonding
1067 *
1068 * Enables or disables lane bonding. This should be called after target
1069 * link width has been set (tb_port_set_link_width()). Note in most
1070 * cases one should use tb_port_lane_bonding_enable() instead to enable
1071 * lane bonding.
1072 *
1073 * Return: %0 in case of success and negative errno in case of error
1074 */
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 else
1091 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 port
1099 * @port: port to enable
1100 *
1101 * Enable bonding by setting the link width of the port and the other
1102 * port in case of dual link port. Does not wait for the link to
1103 * actually reach the bonded state so caller needs to call
1104 * tb_port_wait_for_link_width() before enabling any paths through the
1105 * link to make sure the link is in expected state.
1106 *
1107 * Return: %0 in case of success and negative errno in case of error
1108 */
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 by
1116 * 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. This
1135 * 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 so
1145 * 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 port
1162 * @port: port to disable
1163 *
1164 * Disable bonding by setting the link width of the port and the
1165 * 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 width
1178 * @port: Port to wait for
1179 * @width: Expected link width (bitmask)
1180 * @timeout_msec: Timeout in ms how long to wait
1181 *
1182 * Should be used after both ends of the link have been bonded (or
1183 * bonding has been disabled) to wait until the link actually reaches
1184 * the expected state. Returns %-ETIMEDOUT if the width was not reached
1185 * within the given timeout, %0 if it did. Can be passed a mask of
1186 * 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 when
1204 * polling the lanes so we can ignore it and
1205 * 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 credits
1246 * @port: Port to update
1247 *
1248 * After the link is bonded (or bonding was disabled) the port total
1249 * credits may change, so this function needs to be called to re-read
1250 * 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) connected
1278 * 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 lane
1289 * initialization now so we detect future connects.
1290 *
1291 * For XDomain start the lane initialzation now so the
1292 * 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 enabled
1305 * @port: Port to check
1306 */
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 enabled
1329 * @port: USB3 adapter port to check
1330 */
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 port
1344 * @port: USB3 adapter port to enable
1345 * @enable: Enable/disable the USB3 adapter
1346 */
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 enabled
1360 * @port: PCIe port to check
1361 */
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 port
1375 * @port: PCIe port to enable
1376 * @enable: Enable/disable the PCIe adapter
1377 */
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 active
1389 * @port: DP out port to check
1390 *
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 port
1408 * @port: Port to clear HPD
1409 *
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 port
1429 * @port: DP IN/OUT port to set hops
1430 * @video: Video Hop ID
1431 * @aux_tx: AUX TX Hop ID
1432 * @aux_rx: AUX RX Hop ID
1433 *
1434 * Programs specified Hop IDs for DP IN/OUT port. Can be called for USB4
1435 * router DP adapters too but does not program the values as the fields
1436 * 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 enabled
1468 * @port: DP adapter port to check
1469 */
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 port
1483 * @port: DP IN/OUT port
1484 * @enable: Enable/disable DP path
1485 *
1486 * Once Hop IDs are programmed DP paths can be enabled or disabled by
1487 * 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 else
1502 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 port
1554 * reset and clear up path config spaces.
1555 *
1556 * For protocol adapters we disable the path and
1557 * clear path config space one by one (from 8 to
1558 * 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 also
1615 * during system sleep where sw->config.enabled is already set
1616 * 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 router
1627 * @sw: Router to reset
1628 *
1629 * Issues reset to the router @sw. Can be used for any router. For host
1630 * routers, resets all the downstream ports and cleans up path config
1631 * spaces accordingly. For device routers issues downstream port reset
1632 * through the parent router, so as side effect there will be unplug
1633 * 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 is
1645 * already enumerated. If the router is not enumerated it is
1646 * 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 else
1656 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 offset
1666 * @sw: Router to read the offset value from
1667 * @offset: Offset in the router config space to read from
1668 * @bit: Bit mask in the offset to wait for
1669 * @value: Value of the bits to wait for
1670 * @timeout_msec: Timeout in ms how long to wait
1671 *
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 reached
1674 * 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 switch
1700 *
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 vendor
1732 * specific USB hotplug event enabled for the
1733 * 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 else
1805 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 new
1822 * 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_t
1875device_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_t
1884generation_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 else
1904 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 here
1954 * 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 else
2057 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 else
2073 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 else
2127 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_t
2145vendor_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 handled
2305 * 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 the
2378 * 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 else
2393 max_depth = TB_SWITCH_MAX_DEPTH;
2394
2395 return depth > max_depth;
2396}
2397
2398/**
2399 * tb_switch_alloc() - allocate a switch
2400 * @tb: Pointer to the owning domain
2401 * @parent: Parent device for this switch
2402 * @route: Route string for this switch
2403 *
2404 * Allocates and initializes a switch. Will not upload configuration to
2405 * the switch. For that you need to call tb_switch_configure()
2406 * separately. The returned switch should be released by calling
2407 * tb_switch_put().
2408 *
2409 * Return: Pointer to the allocated switch or ERR_PTR() in case of
2410 * 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 mode
2519 * @tb: Pointer to the owning domain
2520 * @parent: Parent device for this switch
2521 * @route: Route string for this switch
2522 *
2523 * This creates a switch in safe mode. This means the switch pretty much
2524 * lacks all capabilities except DMA configuration port before it is
2525 * 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 failure
2530 */
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 switch
2558 * @sw: Switch to configure
2559 *
2560 * Call this function before the switch is added to the system. It will
2561 * upload configuration to the switch and makes it available for the
2562 * connection manager to use. Can be called to the switch again after
2563 * resume from low power states to re-initialize it.
2564 *
2565 * Return: %0 in case of success and negative errno in case of failure
2566 */
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 version
2584 * accordingly so that it knows to expose all the
2585 * additional capabilities. Program it according to USB4
2586 * 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 else
2591 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 valid
2623 * @sw: Router to configure
2624 *
2625 * Needs to be called before any tunnels can be setup through the
2626 * 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 of
2654 * link controller specific registers
2655 */
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 upper
2667 * two words with ones. This is not strictly following
2668 * UUID format but we want to be compatible with it so
2669 * 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 switch
2705 * 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 failed
2738 * when the dma_port_flash_update_auth() returned. Power cycling
2739 * is not needed (it was done already) so only thing we do here
2740 * 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 there
2751 * is one we need to power cycle the switch in any case to make
2752 * 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 structures
2867 * 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 router
2887 * prefers when the link is brought up. If the router does not
2888 * support asymmetric link configuration, this also will be set
2889 * 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 bonding
2898 * @sw: Switch to enable lane bonding
2899 *
2900 * Connection manager can call this function to enable lane bonding of a
2901 * 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 in
2922 * 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 bonding
2949 * @sw: Switch whose lane bonding to disable
2950 *
2951 * Disables lane bonding between @sw and parent. This can be called even
2952 * 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 to
2965 * two single lane links so avoid that here. Also don't bother
2966 * 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 have
2980 * 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 is
3013 * 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 and
3047 * is changing one of its TX lanes to RX but only if there is a
3048 * 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 else
3054 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 width
3068 * @sw: Router to configure
3069 * @width: The new link width
3070 *
3071 * Set device router link width to @width from router upstream port
3072 * perspective. Supports also asymmetric links if the routers boths side
3073 * 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 configured
3140 * @sw: Switch whose link is configured
3141 *
3142 * Sets the link upstream from @sw configured (from both ends) so that
3143 * it will not be disconnected when the domain exits sleep. Can be
3144 * 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 else
3162 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 link
3174 * @sw: Switch whose link is unconfigured
3175 *
3176 * Sets the link unconfigured so the @sw will be disconnected if the
3177 * 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 be
3188 * configured after router unplug. No need to unconfigure upstream port
3189 * 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 else
3196 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 else
3205 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 domain
3240 * @sw: Switch to add
3241 *
3242 * This is the last step in adding switch to the domain. It will read
3243 * identification information from DROM and initializes ports so that
3244 * they can be used to connect other switches. The switch will be
3245 * exposed to the userspace when this function successfully returns. To
3246 * remove and release the switch, call tb_switch_remove().
3247 *
3248 * Return: %0 in case of success and negative errno in case of failure
3249 */
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. Recent
3256 * host controllers have more complete DROM on NVM that includes
3257 * vendor and model identification strings which we then expose
3258 * to the userspace. NVM can be accessed through DMA
3259 * 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 but
3345 * they forward wakeups from tunneled protocols, so enable it
3346 * 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 switch
3372 * @sw: Switch to remove
3373 *
3374 * This will remove the switch from the domain and release it after last
3375 * reference count drops to zero. If there are switches connected below
3376 * 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 tb_xdomain_remove(port->xdomain);
3396 port->xdomain = NULL;
3397 }
3398
3399 /* Remove any downstream retimers */
3400 tb_retimer_remove_all(port);
3401 }
3402
3403 if (!sw->is_unplugged)
3404 tb_plug_events_active(sw, false);
3405
3406 tb_switch_nvm_remove(sw);
3407 usb4_switch_remove_ports(sw);
3408
3409 if (tb_route(sw))
3410 dev_info(&sw->dev, "device disconnected\n");
3411 device_unregister(&sw->dev);
3412}
3413
3414/**
3415 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
3416 * @sw: Router to mark unplugged
3417 */
3418void tb_sw_set_unplugged(struct tb_switch *sw)
3419{
3420 struct tb_port *port;
3421
3422 if (sw == sw->tb->root_switch) {
3423 tb_sw_WARN(sw, "cannot unplug root switch\n");
3424 return;
3425 }
3426 if (sw->is_unplugged) {
3427 tb_sw_WARN(sw, "is_unplugged already set\n");
3428 return;
3429 }
3430 sw->is_unplugged = true;
3431 tb_switch_for_each_port(sw, port) {
3432 if (tb_port_has_remote(port))
3433 tb_sw_set_unplugged(port->remote->sw);
3434 else if (port->xdomain)
3435 port->xdomain->is_unplugged = true;
3436 }
3437}
3438
3439static int tb_switch_set_wake(struct tb_switch *sw, unsigned int flags)
3440{
3441 if (flags)
3442 tb_sw_dbg(sw, "enabling wakeup: %#x\n", flags);
3443 else
3444 tb_sw_dbg(sw, "disabling wakeup\n");
3445
3446 if (tb_switch_is_usb4(sw))
3447 return usb4_switch_set_wake(sw, flags);
3448 return tb_lc_set_wake(sw, flags);
3449}
3450
3451static void tb_switch_check_wakes(struct tb_switch *sw)
3452{
3453 if (device_may_wakeup(&sw->dev)) {
3454 if (tb_switch_is_usb4(sw))
3455 usb4_switch_check_wakes(sw);
3456 }
3457}
3458
3459/**
3460 * tb_switch_resume() - Resume a switch after sleep
3461 * @sw: Switch to resume
3462 * @runtime: Is this resume from runtime suspend or system sleep
3463 *
3464 * Resumes and re-enumerates router (and all its children), if still plugged
3465 * after suspend. Don't enumerate device router whose UID was changed during
3466 * suspend. If this is resume from system sleep, notifies PM core about the
3467 * wakes occurred during suspend. Disables all wakes, except USB4 wake of
3468 * upstream port for USB4 routers that shall be always enabled.
3469 */
3470int tb_switch_resume(struct tb_switch *sw, bool runtime)
3471{
3472 struct tb_port *port;
3473 int err;
3474
3475 tb_sw_dbg(sw, "resuming switch\n");
3476
3477 /*
3478 * Check for UID of the connected switches except for root
3479 * switch which we assume cannot be removed.
3480 */
3481 if (tb_route(sw)) {
3482 u64 uid;
3483
3484 /*
3485 * Check first that we can still read the switch config
3486 * space. It may be that there is now another domain
3487 * connected.
3488 */
3489 err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
3490 if (err < 0) {
3491 tb_sw_info(sw, "switch not present anymore\n");
3492 return err;
3493 }
3494
3495 /* We don't have any way to confirm this was the same device */
3496 if (!sw->uid)
3497 return -ENODEV;
3498
3499 if (tb_switch_is_usb4(sw))
3500 err = usb4_switch_read_uid(sw, &uid);
3501 else
3502 err = tb_drom_read_uid_only(sw, &uid);
3503 if (err) {
3504 tb_sw_warn(sw, "uid read failed\n");
3505 return err;
3506 }
3507 if (sw->uid != uid) {
3508 tb_sw_info(sw,
3509 "changed while suspended (uid %#llx -> %#llx)\n",
3510 sw->uid, uid);
3511 return -ENODEV;
3512 }
3513 }
3514
3515 err = tb_switch_configure(sw);
3516 if (err)
3517 return err;
3518
3519 if (!runtime)
3520 tb_switch_check_wakes(sw);
3521
3522 /* Disable wakes */
3523 tb_switch_set_wake(sw, 0);
3524
3525 err = tb_switch_tmu_init(sw);
3526 if (err)
3527 return err;
3528
3529 /* check for surviving downstream switches */
3530 tb_switch_for_each_port(sw, port) {
3531 if (!tb_port_is_null(port))
3532 continue;
3533
3534 if (!tb_port_resume(port))
3535 continue;
3536
3537 if (tb_wait_for_port(port, true) <= 0) {
3538 tb_port_warn(port,
3539 "lost during suspend, disconnecting\n");
3540 if (tb_port_has_remote(port))
3541 tb_sw_set_unplugged(port->remote->sw);
3542 else if (port->xdomain)
3543 port->xdomain->is_unplugged = true;
3544 } else {
3545 /*
3546 * Always unlock the port so the downstream
3547 * switch/domain is accessible.
3548 */
3549 if (tb_port_unlock(port))
3550 tb_port_warn(port, "failed to unlock port\n");
3551 if (port->remote &&
3552 tb_switch_resume(port->remote->sw, runtime)) {
3553 tb_port_warn(port,
3554 "lost during suspend, disconnecting\n");
3555 tb_sw_set_unplugged(port->remote->sw);
3556 }
3557 }
3558 }
3559 return 0;
3560}
3561
3562/**
3563 * tb_switch_suspend() - Put a switch to sleep
3564 * @sw: Switch to suspend
3565 * @runtime: Is this runtime suspend or system sleep
3566 *
3567 * Suspends router and all its children. Enables wakes according to
3568 * value of @runtime and then sets sleep bit for the router. If @sw is
3569 * host router the domain is ready to go to sleep once this function
3570 * returns.
3571 */
3572void tb_switch_suspend(struct tb_switch *sw, bool runtime)
3573{
3574 unsigned int flags = 0;
3575 struct tb_port *port;
3576 int err;
3577
3578 tb_sw_dbg(sw, "suspending switch\n");
3579
3580 /*
3581 * Actually only needed for Titan Ridge but for simplicity can be
3582 * done for USB4 device too as CLx is re-enabled at resume.
3583 */
3584 tb_switch_clx_disable(sw);
3585
3586 err = tb_plug_events_active(sw, false);
3587 if (err)
3588 return;
3589
3590 tb_switch_for_each_port(sw, port) {
3591 if (tb_port_has_remote(port))
3592 tb_switch_suspend(port->remote->sw, runtime);
3593 }
3594
3595 if (runtime) {
3596 /* Trigger wake when something is plugged in/out */
3597 flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT;
3598 flags |= TB_WAKE_ON_USB4;
3599 flags |= TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE | TB_WAKE_ON_DP;
3600 } else if (device_may_wakeup(&sw->dev)) {
3601 flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;
3602 }
3603
3604 tb_switch_set_wake(sw, flags);
3605
3606 if (tb_switch_is_usb4(sw))
3607 usb4_switch_set_sleep(sw);
3608 else
3609 tb_lc_set_sleep(sw);
3610}
3611
3612/**
3613 * tb_switch_query_dp_resource() - Query availability of DP resource
3614 * @sw: Switch whose DP resource is queried
3615 * @in: DP IN port
3616 *
3617 * Queries availability of DP resource for DP tunneling using switch
3618 * specific means. Returns %true if resource is available.
3619 */
3620bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in)
3621{
3622 if (tb_switch_is_usb4(sw))
3623 return usb4_switch_query_dp_resource(sw, in);
3624 return tb_lc_dp_sink_query(sw, in);
3625}
3626
3627/**
3628 * tb_switch_alloc_dp_resource() - Allocate available DP resource
3629 * @sw: Switch whose DP resource is allocated
3630 * @in: DP IN port
3631 *
3632 * Allocates DP resource for DP tunneling. The resource must be
3633 * available for this to succeed (see tb_switch_query_dp_resource()).
3634 * Returns %0 in success and negative errno otherwise.
3635 */
3636int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
3637{
3638 int ret;
3639
3640 if (tb_switch_is_usb4(sw))
3641 ret = usb4_switch_alloc_dp_resource(sw, in);
3642 else
3643 ret = tb_lc_dp_sink_alloc(sw, in);
3644
3645 if (ret)
3646 tb_sw_warn(sw, "failed to allocate DP resource for port %d\n",
3647 in->port);
3648 else
3649 tb_sw_dbg(sw, "allocated DP resource for port %d\n", in->port);
3650
3651 return ret;
3652}
3653
3654/**
3655 * tb_switch_dealloc_dp_resource() - De-allocate DP resource
3656 * @sw: Switch whose DP resource is de-allocated
3657 * @in: DP IN port
3658 *
3659 * De-allocates DP resource that was previously allocated for DP
3660 * tunneling.
3661 */
3662void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
3663{
3664 int ret;
3665
3666 if (tb_switch_is_usb4(sw))
3667 ret = usb4_switch_dealloc_dp_resource(sw, in);
3668 else
3669 ret = tb_lc_dp_sink_dealloc(sw, in);
3670
3671 if (ret)
3672 tb_sw_warn(sw, "failed to de-allocate DP resource for port %d\n",
3673 in->port);
3674 else
3675 tb_sw_dbg(sw, "released DP resource for port %d\n", in->port);
3676}
3677
3678struct tb_sw_lookup {
3679 struct tb *tb;
3680 u8 link;
3681 u8 depth;
3682 const uuid_t *uuid;
3683 u64 route;
3684};
3685
3686static int tb_switch_match(struct device *dev, const void *data)
3687{
3688 struct tb_switch *sw = tb_to_switch(dev);
3689 const struct tb_sw_lookup *lookup = data;
3690
3691 if (!sw)
3692 return 0;
3693 if (sw->tb != lookup->tb)
3694 return 0;
3695
3696 if (lookup->uuid)
3697 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
3698
3699 if (lookup->route) {
3700 return sw->config.route_lo == lower_32_bits(lookup->route) &&
3701 sw->config.route_hi == upper_32_bits(lookup->route);
3702 }
3703
3704 /* Root switch is matched only by depth */
3705 if (!lookup->depth)
3706 return !sw->depth;
3707
3708 return sw->link == lookup->link && sw->depth == lookup->depth;
3709}
3710
3711/**
3712 * tb_switch_find_by_link_depth() - Find switch by link and depth
3713 * @tb: Domain the switch belongs
3714 * @link: Link number the switch is connected
3715 * @depth: Depth of the switch in link
3716 *
3717 * Returned switch has reference count increased so the caller needs to
3718 * call tb_switch_put() when done with the switch.
3719 */
3720struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
3721{
3722 struct tb_sw_lookup lookup;
3723 struct device *dev;
3724
3725 memset(&lookup, 0, sizeof(lookup));
3726 lookup.tb = tb;
3727 lookup.link = link;
3728 lookup.depth = depth;
3729
3730 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3731 if (dev)
3732 return tb_to_switch(dev);
3733
3734 return NULL;
3735}
3736
3737/**
3738 * tb_switch_find_by_uuid() - Find switch by UUID
3739 * @tb: Domain the switch belongs
3740 * @uuid: UUID to look for
3741 *
3742 * Returned switch has reference count increased so the caller needs to
3743 * call tb_switch_put() when done with the switch.
3744 */
3745struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
3746{
3747 struct tb_sw_lookup lookup;
3748 struct device *dev;
3749
3750 memset(&lookup, 0, sizeof(lookup));
3751 lookup.tb = tb;
3752 lookup.uuid = uuid;
3753
3754 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3755 if (dev)
3756 return tb_to_switch(dev);
3757
3758 return NULL;
3759}
3760
3761/**
3762 * tb_switch_find_by_route() - Find switch by route string
3763 * @tb: Domain the switch belongs
3764 * @route: Route string to look for
3765 *
3766 * Returned switch has reference count increased so the caller needs to
3767 * call tb_switch_put() when done with the switch.
3768 */
3769struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
3770{
3771 struct tb_sw_lookup lookup;
3772 struct device *dev;
3773
3774 if (!route)
3775 return tb_switch_get(tb->root_switch);
3776
3777 memset(&lookup, 0, sizeof(lookup));
3778 lookup.tb = tb;
3779 lookup.route = route;
3780
3781 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3782 if (dev)
3783 return tb_to_switch(dev);
3784
3785 return NULL;
3786}
3787
3788/**
3789 * tb_switch_find_port() - return the first port of @type on @sw or NULL
3790 * @sw: Switch to find the port from
3791 * @type: Port type to look for
3792 */
3793struct tb_port *tb_switch_find_port(struct tb_switch *sw,
3794 enum tb_port_type type)
3795{
3796 struct tb_port *port;
3797
3798 tb_switch_for_each_port(sw, port) {
3799 if (port->config.type == type)
3800 return port;
3801 }
3802
3803 return NULL;
3804}
3805
3806/*
3807 * Can be used for read/write a specified PCIe bridge for any Thunderbolt 3
3808 * device. For now used only for Titan Ridge.
3809 */
3810static int tb_switch_pcie_bridge_write(struct tb_switch *sw, unsigned int bridge,
3811 unsigned int pcie_offset, u32 value)
3812{
3813 u32 offset, command, val;
3814 int ret;
3815
3816 if (sw->generation != 3)
3817 return -EOPNOTSUPP;
3818
3819 offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_WR_DATA;
3820 ret = tb_sw_write(sw, &value, TB_CFG_SWITCH, offset, 1);
3821 if (ret)
3822 return ret;
3823
3824 command = pcie_offset & TB_PLUG_EVENTS_PCIE_CMD_DW_OFFSET_MASK;
3825 command |= BIT(bridge + TB_PLUG_EVENTS_PCIE_CMD_BR_SHIFT);
3826 command |= TB_PLUG_EVENTS_PCIE_CMD_RD_WR_MASK;
3827 command |= TB_PLUG_EVENTS_PCIE_CMD_COMMAND_VAL
3828 << TB_PLUG_EVENTS_PCIE_CMD_COMMAND_SHIFT;
3829 command |= TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK;
3830
3831 offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_CMD;
3832
3833 ret = tb_sw_write(sw, &command, TB_CFG_SWITCH, offset, 1);
3834 if (ret)
3835 return ret;
3836
3837 ret = tb_switch_wait_for_bit(sw, offset,
3838 TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK, 0, 100);
3839 if (ret)
3840 return ret;
3841
3842 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
3843 if (ret)
3844 return ret;
3845
3846 if (val & TB_PLUG_EVENTS_PCIE_CMD_TIMEOUT_MASK)
3847 return -ETIMEDOUT;
3848
3849 return 0;
3850}
3851
3852/**
3853 * tb_switch_pcie_l1_enable() - Enable PCIe link to enter L1 state
3854 * @sw: Router to enable PCIe L1
3855 *
3856 * For Titan Ridge switch to enter CLx state, its PCIe bridges shall enable
3857 * entry to PCIe L1 state. Shall be called after the upstream PCIe tunnel
3858 * was configured. Due to Intel platforms limitation, shall be called only
3859 * for first hop switch.
3860 */
3861int tb_switch_pcie_l1_enable(struct tb_switch *sw)
3862{
3863 struct tb_switch *parent = tb_switch_parent(sw);
3864 int ret;
3865
3866 if (!tb_route(sw))
3867 return 0;
3868
3869 if (!tb_switch_is_titan_ridge(sw))
3870 return 0;
3871
3872 /* Enable PCIe L1 enable only for first hop router (depth = 1) */
3873 if (tb_route(parent))
3874 return 0;
3875
3876 /* Write to downstream PCIe bridge #5 aka Dn4 */
3877 ret = tb_switch_pcie_bridge_write(sw, 5, 0x143, 0x0c7806b1);
3878 if (ret)
3879 return ret;
3880
3881 /* Write to Upstream PCIe bridge #0 aka Up0 */
3882 return tb_switch_pcie_bridge_write(sw, 0, 0x143, 0x0c5806b1);
3883}
3884
3885/**
3886 * tb_switch_xhci_connect() - Connect internal xHCI
3887 * @sw: Router whose xHCI to connect
3888 *
3889 * Can be called to any router. For Alpine Ridge and Titan Ridge
3890 * performs special flows that bring the xHCI functional for any device
3891 * connected to the type-C port. Call only after PCIe tunnel has been
3892 * established. The function only does the connect if not done already
3893 * so can be called several times for the same router.
3894 */
3895int tb_switch_xhci_connect(struct tb_switch *sw)
3896{
3897 struct tb_port *port1, *port3;
3898 int ret;
3899
3900 if (sw->generation != 3)
3901 return 0;
3902
3903 port1 = &sw->ports[1];
3904 port3 = &sw->ports[3];
3905
3906 if (tb_switch_is_alpine_ridge(sw)) {
3907 bool usb_port1, usb_port3, xhci_port1, xhci_port3;
3908
3909 usb_port1 = tb_lc_is_usb_plugged(port1);
3910 usb_port3 = tb_lc_is_usb_plugged(port3);
3911 xhci_port1 = tb_lc_is_xhci_connected(port1);
3912 xhci_port3 = tb_lc_is_xhci_connected(port3);
3913
3914 /* Figure out correct USB port to connect */
3915 if (usb_port1 && !xhci_port1) {
3916 ret = tb_lc_xhci_connect(port1);
3917 if (ret)
3918 return ret;
3919 }
3920 if (usb_port3 && !xhci_port3)
3921 return tb_lc_xhci_connect(port3);
3922 } else if (tb_switch_is_titan_ridge(sw)) {
3923 ret = tb_lc_xhci_connect(port1);
3924 if (ret)
3925 return ret;
3926 return tb_lc_xhci_connect(port3);
3927 }
3928
3929 return 0;
3930}
3931
3932/**
3933 * tb_switch_xhci_disconnect() - Disconnect internal xHCI
3934 * @sw: Router whose xHCI to disconnect
3935 *
3936 * The opposite of tb_switch_xhci_connect(). Disconnects xHCI on both
3937 * ports.
3938 */
3939void tb_switch_xhci_disconnect(struct tb_switch *sw)
3940{
3941 if (sw->generation == 3) {
3942 struct tb_port *port1 = &sw->ports[1];
3943 struct tb_port *port3 = &sw->ports[3];
3944
3945 tb_lc_xhci_disconnect(port1);
3946 tb_port_dbg(port1, "disconnected xHCI\n");
3947 tb_lc_xhci_disconnect(port3);
3948 tb_port_dbg(port3, "disconnected xHCI\n");
3949 }
3950}