Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/hex.h>
11#include <linux/idr.h>
12#include <linux/module.h>
13#include <linux/nvmem-provider.h>
14#include <linux/pm_runtime.h>
15#include <linux/sched/signal.h>
16#include <linux/sizes.h>
17#include <linux/slab.h>
18#include <linux/string_helpers.h>
19
20#include "tb.h"
21
22/* Switch NVM support */
23
24struct nvm_auth_status {
25 struct list_head list;
26 uuid_t uuid;
27 u32 status;
28};
29
30/*
31 * Hold NVM authentication failure status per switch This information
32 * needs to stay around even when the switch gets power cycled so we
33 * keep it separately.
34 */
35static LIST_HEAD(nvm_auth_status_cache);
36static DEFINE_MUTEX(nvm_auth_status_lock);
37
38static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw)
39{
40 struct nvm_auth_status *st;
41
42 list_for_each_entry(st, &nvm_auth_status_cache, list) {
43 if (uuid_equal(&st->uuid, sw->uuid))
44 return st;
45 }
46
47 return NULL;
48}
49
50static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status)
51{
52 struct nvm_auth_status *st;
53
54 mutex_lock(&nvm_auth_status_lock);
55 st = __nvm_get_auth_status(sw);
56 mutex_unlock(&nvm_auth_status_lock);
57
58 *status = st ? st->status : 0;
59}
60
61static void nvm_set_auth_status(const struct tb_switch *sw, u32 status)
62{
63 struct nvm_auth_status *st;
64
65 if (WARN_ON(!sw->uuid))
66 return;
67
68 mutex_lock(&nvm_auth_status_lock);
69 st = __nvm_get_auth_status(sw);
70
71 if (!st) {
72 st = kzalloc_obj(*st);
73 if (!st)
74 goto unlock;
75
76 memcpy(&st->uuid, sw->uuid, sizeof(st->uuid));
77 INIT_LIST_HEAD(&st->list);
78 list_add_tail(&st->list, &nvm_auth_status_cache);
79 }
80
81 st->status = status;
82unlock:
83 mutex_unlock(&nvm_auth_status_lock);
84}
85
86static void nvm_clear_auth_status(const struct tb_switch *sw)
87{
88 struct nvm_auth_status *st;
89
90 mutex_lock(&nvm_auth_status_lock);
91 st = __nvm_get_auth_status(sw);
92 if (st) {
93 list_del(&st->list);
94 kfree(st);
95 }
96 mutex_unlock(&nvm_auth_status_lock);
97}
98
99static int nvm_validate_and_write(struct tb_switch *sw)
100{
101 unsigned int image_size;
102 const u8 *buf;
103 int ret;
104
105 ret = tb_nvm_validate(sw->nvm);
106 if (ret)
107 return ret;
108
109 ret = tb_nvm_write_headers(sw->nvm);
110 if (ret)
111 return ret;
112
113 buf = sw->nvm->buf_data_start;
114 image_size = sw->nvm->buf_data_size;
115
116 if (tb_switch_is_usb4(sw))
117 ret = usb4_switch_nvm_write(sw, 0, buf, image_size);
118 else
119 ret = dma_port_flash_write(sw->dma_port, 0, buf, image_size);
120 if (ret)
121 return ret;
122
123 sw->nvm->flushed = true;
124 return 0;
125}
126
127static int nvm_authenticate_host_dma_port(struct tb_switch *sw)
128{
129 int ret = 0;
130
131 /*
132 * Root switch NVM upgrade requires that we disconnect the
133 * existing paths first (in case it is not in safe mode
134 * already).
135 */
136 if (!sw->safe_mode) {
137 u32 status;
138
139 ret = tb_domain_disconnect_all_paths(sw->tb);
140 if (ret)
141 return ret;
142 /*
143 * The host controller goes away pretty soon after this if
144 * everything goes well so getting timeout is expected.
145 */
146 ret = dma_port_flash_update_auth(sw->dma_port);
147 if (!ret || ret == -ETIMEDOUT)
148 return 0;
149
150 /*
151 * Any error from update auth operation requires power
152 * cycling of the host router.
153 */
154 tb_sw_warn(sw, "failed to authenticate NVM, power cycling\n");
155 if (dma_port_flash_update_auth_status(sw->dma_port, &status) > 0)
156 nvm_set_auth_status(sw, status);
157 }
158
159 /*
160 * From safe mode we can get out by just power cycling the
161 * switch.
162 */
163 dma_port_power_cycle(sw->dma_port);
164 return ret;
165}
166
167static int nvm_authenticate_device_dma_port(struct tb_switch *sw)
168{
169 int ret, retries = 10;
170
171 ret = dma_port_flash_update_auth(sw->dma_port);
172 switch (ret) {
173 case 0:
174 case -ETIMEDOUT:
175 case -EACCES:
176 case -EINVAL:
177 /* Power cycle is required */
178 break;
179 default:
180 return ret;
181 }
182
183 /*
184 * Poll here for the authentication status. It takes some time
185 * for the device to respond (we get timeout for a while). Once
186 * we get response the device needs to be power cycled in order
187 * to the new NVM to be taken into use.
188 */
189 do {
190 u32 status;
191
192 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
193 if (ret < 0 && ret != -ETIMEDOUT)
194 return ret;
195 if (ret > 0) {
196 if (status) {
197 tb_sw_warn(sw, "failed to authenticate NVM\n");
198 nvm_set_auth_status(sw, status);
199 }
200
201 tb_sw_info(sw, "power cycling the switch now\n");
202 dma_port_power_cycle(sw->dma_port);
203 return 0;
204 }
205
206 msleep(500);
207 } while (--retries);
208
209 return -ETIMEDOUT;
210}
211
212static void nvm_authenticate_start_dma_port(struct tb_switch *sw)
213{
214 struct pci_dev *root_port;
215
216 /*
217 * During host router NVM upgrade we should not allow root port to
218 * go into D3cold because some root ports cannot trigger PME
219 * itself. To be on the safe side keep the root port in D0 during
220 * the whole upgrade process.
221 */
222 root_port = pcie_find_root_port(sw->tb->nhi->pdev);
223 if (root_port)
224 pm_runtime_get_noresume(&root_port->dev);
225}
226
227static void nvm_authenticate_complete_dma_port(struct tb_switch *sw)
228{
229 struct pci_dev *root_port;
230
231 root_port = pcie_find_root_port(sw->tb->nhi->pdev);
232 if (root_port)
233 pm_runtime_put(&root_port->dev);
234}
235
236static inline bool nvm_readable(struct tb_switch *sw)
237{
238 if (tb_switch_is_usb4(sw)) {
239 /*
240 * USB4 devices must support NVM operations but it is
241 * optional for hosts. Therefore we query the NVM sector
242 * size here and if it is supported assume NVM
243 * operations are implemented.
244 */
245 return usb4_switch_nvm_sector_size(sw) > 0;
246 }
247
248 /* Thunderbolt 2 and 3 devices support NVM through DMA port */
249 return !!sw->dma_port;
250}
251
252static inline bool nvm_upgradeable(struct tb_switch *sw)
253{
254 if (sw->no_nvm_upgrade)
255 return false;
256 return nvm_readable(sw);
257}
258
259static int nvm_authenticate(struct tb_switch *sw, bool auth_only)
260{
261 int ret;
262
263 if (tb_switch_is_usb4(sw)) {
264 if (auth_only) {
265 ret = usb4_switch_nvm_set_offset(sw, 0);
266 if (ret)
267 return ret;
268 }
269 sw->nvm->authenticating = true;
270 return usb4_switch_nvm_authenticate(sw);
271 }
272 if (auth_only)
273 return -EOPNOTSUPP;
274
275 sw->nvm->authenticating = true;
276 if (!tb_route(sw)) {
277 nvm_authenticate_start_dma_port(sw);
278 ret = nvm_authenticate_host_dma_port(sw);
279 } else {
280 ret = nvm_authenticate_device_dma_port(sw);
281 }
282
283 return ret;
284}
285
286/**
287 * tb_switch_nvm_read() - Read router NVM
288 * @sw: Router whose NVM to read
289 * @address: Start address on the NVM
290 * @buf: Buffer where the read data is copied
291 * @size: Size of the buffer in bytes
292 *
293 * Reads from router NVM and returns the requested data in @buf. Locking
294 * is up to the caller.
295 *
296 * Return: %0 on success, negative errno otherwise.
297 */
298int tb_switch_nvm_read(struct tb_switch *sw, unsigned int address, void *buf,
299 size_t size)
300{
301 if (tb_switch_is_usb4(sw))
302 return usb4_switch_nvm_read(sw, address, buf, size);
303 return dma_port_flash_read(sw->dma_port, address, buf, size);
304}
305
306static int nvm_read(void *priv, unsigned int offset, void *val, size_t bytes)
307{
308 struct tb_nvm *nvm = priv;
309 struct tb_switch *sw = tb_to_switch(nvm->dev);
310 int ret;
311
312 pm_runtime_get_sync(&sw->dev);
313
314 if (!mutex_trylock(&sw->tb->lock)) {
315 ret = restart_syscall();
316 goto out;
317 }
318
319 ret = tb_switch_nvm_read(sw, offset, val, bytes);
320 mutex_unlock(&sw->tb->lock);
321
322out:
323 pm_runtime_mark_last_busy(&sw->dev);
324 pm_runtime_put_autosuspend(&sw->dev);
325
326 return ret;
327}
328
329static int nvm_write(void *priv, unsigned int offset, void *val, size_t bytes)
330{
331 struct tb_nvm *nvm = priv;
332 struct tb_switch *sw = tb_to_switch(nvm->dev);
333 int ret;
334
335 if (!mutex_trylock(&sw->tb->lock))
336 return restart_syscall();
337
338 /*
339 * Since writing the NVM image might require some special steps,
340 * for example when CSS headers are written, we cache the image
341 * locally here and handle the special cases when the user asks
342 * us to authenticate the image.
343 */
344 ret = tb_nvm_write_buf(nvm, offset, val, bytes);
345 mutex_unlock(&sw->tb->lock);
346
347 return ret;
348}
349
350static int tb_switch_nvm_init(struct tb_switch *sw)
351{
352 struct tb_nvm *nvm;
353 int ret;
354
355 if (!nvm_readable(sw))
356 return 0;
357
358 nvm = tb_nvm_alloc(&sw->dev);
359 if (IS_ERR(nvm)) {
360 ret = PTR_ERR(nvm) == -EOPNOTSUPP ? 0 : PTR_ERR(nvm);
361 goto err_nvm;
362 }
363
364 ret = tb_nvm_read_version(nvm);
365 if (ret)
366 goto err_nvm;
367
368 sw->nvm = nvm;
369 return 0;
370
371err_nvm:
372 tb_sw_dbg(sw, "NVM upgrade disabled\n");
373 sw->no_nvm_upgrade = true;
374 if (!IS_ERR(nvm))
375 tb_nvm_free(nvm);
376
377 return ret;
378}
379
380static int tb_switch_nvm_add(struct tb_switch *sw)
381{
382 struct tb_nvm *nvm = sw->nvm;
383 int ret;
384
385 if (!nvm)
386 return 0;
387
388 /*
389 * If the switch is in safe-mode the only accessible portion of
390 * the NVM is the non-active one where userspace is expected to
391 * write new functional NVM.
392 */
393 if (!sw->safe_mode) {
394 ret = tb_nvm_add_active(nvm, nvm_read);
395 if (ret)
396 goto err_nvm;
397 tb_sw_dbg(sw, "NVM version %x.%x\n", nvm->major, nvm->minor);
398 }
399
400 if (!sw->no_nvm_upgrade) {
401 ret = tb_nvm_add_non_active(nvm, nvm_write);
402 if (ret)
403 goto err_nvm;
404 }
405
406 return 0;
407
408err_nvm:
409 tb_sw_dbg(sw, "NVM upgrade disabled\n");
410 sw->no_nvm_upgrade = true;
411 tb_nvm_free(nvm);
412
413 return ret;
414}
415
416static void tb_switch_nvm_remove(struct tb_switch *sw)
417{
418 struct tb_nvm *nvm;
419
420 nvm = sw->nvm;
421 sw->nvm = NULL;
422
423 if (!nvm)
424 return;
425
426 /* Remove authentication status in case the switch is unplugged */
427 if (!nvm->authenticating)
428 nvm_clear_auth_status(sw);
429
430 tb_nvm_free(nvm);
431}
432
433/* port utility functions */
434
435static const char *tb_port_type(const struct tb_regs_port_header *port)
436{
437 switch (port->type >> 16) {
438 case 0:
439 switch ((u8) port->type) {
440 case 0:
441 return "Inactive";
442 case 1:
443 return "Port";
444 case 2:
445 return "NHI";
446 default:
447 return "unknown";
448 }
449 case 0x2:
450 return "Ethernet";
451 case 0x8:
452 return "SATA";
453 case 0xe:
454 return "DP/HDMI";
455 case 0x10:
456 return "PCIe";
457 case 0x20:
458 return "USB";
459 default:
460 return "unknown";
461 }
462}
463
464static void tb_dump_port(struct tb *tb, const struct tb_port *port)
465{
466 const struct tb_regs_port_header *regs = &port->config;
467
468 tb_dbg(tb,
469 " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
470 regs->port_number, regs->vendor_id, regs->device_id,
471 regs->revision, regs->thunderbolt_version, tb_port_type(regs),
472 regs->type);
473 tb_dbg(tb, " Max hop id (in/out): %d/%d\n",
474 regs->max_in_hop_id, regs->max_out_hop_id);
475 tb_dbg(tb, " Max counters: %d\n", regs->max_counters);
476 tb_dbg(tb, " NFC Credits: %#x\n", regs->nfc_credits);
477 tb_dbg(tb, " Credits (total/control): %u/%u\n", port->total_credits,
478 port->ctl_credits);
479}
480
481/**
482 * tb_port_state() - get connectedness state of a port
483 * @port: the port to check
484 *
485 * The port must have a TB_CAP_PHY (i.e. it should be a real port).
486 *
487 * Return: &enum tb_port_state or negative error code on failure.
488 */
489int tb_port_state(struct tb_port *port)
490{
491 struct tb_cap_phy phy;
492 int res;
493 if (port->cap_phy == 0) {
494 tb_port_WARN(port, "does not have a PHY\n");
495 return -EINVAL;
496 }
497 res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
498 if (res)
499 return res;
500 return phy.state;
501}
502
503/**
504 * tb_wait_for_port() - wait for a port to become ready
505 * @port: Port to wait
506 * @wait_if_unplugged: Wait also when port is unplugged
507 *
508 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
509 * wait_if_unplugged is set then we also wait if the port is in state
510 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
511 * switch resume). Otherwise we only wait if a device is registered but the link
512 * has not yet been established.
513 *
514 * Return:
515 * * %0 - If the port is not connected or failed to reach
516 * state %TB_PORT_UP within one second.
517 * * %1 - If the port is connected and in state %TB_PORT_UP.
518 * * Negative errno - An error occurred.
519 */
520int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
521{
522 int retries = 10;
523 int state;
524 if (!port->cap_phy) {
525 tb_port_WARN(port, "does not have PHY\n");
526 return -EINVAL;
527 }
528 if (tb_is_upstream_port(port)) {
529 tb_port_WARN(port, "is the upstream port\n");
530 return -EINVAL;
531 }
532
533 while (retries--) {
534 state = tb_port_state(port);
535 switch (state) {
536 case TB_PORT_DISABLED:
537 tb_port_dbg(port, "is disabled (state: 0)\n");
538 return 0;
539
540 case TB_PORT_UNPLUGGED:
541 if (wait_if_unplugged) {
542 /* used during resume */
543 tb_port_dbg(port,
544 "is unplugged (state: 7), retrying...\n");
545 msleep(100);
546 break;
547 }
548 tb_port_dbg(port, "is unplugged (state: 7)\n");
549 return 0;
550
551 case TB_PORT_UP:
552 case TB_PORT_TX_CL0S:
553 case TB_PORT_RX_CL0S:
554 case TB_PORT_CL1:
555 case TB_PORT_CL2:
556 tb_port_dbg(port, "is connected, link is up (state: %d)\n", state);
557 return 1;
558
559 default:
560 if (state < 0)
561 return state;
562
563 /*
564 * After plug-in the state is TB_PORT_CONNECTING. Give it some
565 * time.
566 */
567 tb_port_dbg(port,
568 "is connected, link is not up (state: %d), retrying...\n",
569 state);
570 msleep(100);
571 }
572
573 }
574 tb_port_warn(port,
575 "failed to reach state TB_PORT_UP. Ignoring port...\n");
576 return 0;
577}
578
579/**
580 * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
581 * @port: Port to add/remove NFC credits
582 * @credits: Credits to add/remove
583 *
584 * Change the number of NFC credits allocated to @port by @credits. To remove
585 * NFC credits pass a negative amount of credits.
586 *
587 * Return: %0 on success, negative errno otherwise.
588 */
589int tb_port_add_nfc_credits(struct tb_port *port, int credits)
590{
591 u32 nfc_credits;
592
593 if (credits == 0 || port->sw->is_unplugged)
594 return 0;
595
596 /*
597 * USB4 restricts programming NFC buffers to lane adapters only
598 * so skip other ports.
599 */
600 if (tb_switch_is_usb4(port->sw) && !tb_port_is_null(port))
601 return 0;
602
603 nfc_credits = port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK;
604 if (credits < 0)
605 credits = max_t(int, -nfc_credits, credits);
606
607 nfc_credits += credits;
608
609 tb_port_dbg(port, "adding %d NFC credits to %lu", credits,
610 port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK);
611
612 port->config.nfc_credits &= ~ADP_CS_4_NFC_BUFFERS_MASK;
613 port->config.nfc_credits |= nfc_credits;
614
615 return tb_port_write(port, &port->config.nfc_credits,
616 TB_CFG_PORT, ADP_CS_4, 1);
617}
618
619/**
620 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
621 * @port: Port whose counters to clear
622 * @counter: Counter index to clear
623 *
624 * Return: %0 on success, negative errno otherwise.
625 */
626int tb_port_clear_counter(struct tb_port *port, int counter)
627{
628 u32 zero[3] = { 0, 0, 0 };
629 tb_port_dbg(port, "clearing counter %d\n", counter);
630 return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
631}
632
633/**
634 * tb_port_unlock() - Unlock downstream port
635 * @port: Port to unlock
636 *
637 * Needed for USB4 but can be called for any CIO/USB4 ports. Makes the
638 * downstream router accessible for CM.
639 *
640 * Return: %0 on success, negative errno otherwise.
641 */
642int tb_port_unlock(struct tb_port *port)
643{
644 if (tb_switch_is_icm(port->sw))
645 return 0;
646 if (!tb_port_is_null(port))
647 return -EINVAL;
648 if (tb_switch_is_usb4(port->sw))
649 return usb4_port_unlock(port);
650 return 0;
651}
652
653static int __tb_port_enable(struct tb_port *port, bool enable)
654{
655 int ret;
656 u32 phy;
657
658 if (!tb_port_is_null(port))
659 return -EINVAL;
660
661 ret = tb_port_read(port, &phy, TB_CFG_PORT,
662 port->cap_phy + LANE_ADP_CS_1, 1);
663 if (ret)
664 return ret;
665
666 if (enable)
667 phy &= ~LANE_ADP_CS_1_LD;
668 else
669 phy |= LANE_ADP_CS_1_LD;
670
671
672 ret = tb_port_write(port, &phy, TB_CFG_PORT,
673 port->cap_phy + LANE_ADP_CS_1, 1);
674 if (ret)
675 return ret;
676
677 tb_port_dbg(port, "lane %s\n", str_enabled_disabled(enable));
678 return 0;
679}
680
681/**
682 * tb_port_enable() - Enable lane adapter
683 * @port: Port to enable (can be %NULL)
684 *
685 * This is used for lane 0 and 1 adapters to enable it.
686 *
687 * Return: %0 on success, negative errno otherwise.
688 */
689int tb_port_enable(struct tb_port *port)
690{
691 return __tb_port_enable(port, true);
692}
693
694/**
695 * tb_port_disable() - Disable lane adapter
696 * @port: Port to disable (can be %NULL)
697 *
698 * This is used for lane 0 and 1 adapters to disable it.
699 *
700 * Return: %0 on success, negative errno otherwise.
701 */
702int tb_port_disable(struct tb_port *port)
703{
704 return __tb_port_enable(port, false);
705}
706
707static int tb_port_reset(struct tb_port *port)
708{
709 if (tb_switch_is_usb4(port->sw))
710 return port->cap_usb4 ? usb4_port_reset(port) : 0;
711 return tb_lc_reset_port(port);
712}
713
714/*
715 * tb_init_port() - initialize a port
716 *
717 * This is a helper method for tb_switch_alloc. Does not check or initialize
718 * any downstream switches.
719 *
720 * Return: %0 on success, negative errno otherwise.
721 */
722static int tb_init_port(struct tb_port *port)
723{
724 int res;
725 int cap;
726
727 INIT_LIST_HEAD(&port->list);
728
729 /* Control adapter does not have configuration space */
730 if (!port->port)
731 return 0;
732
733 res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
734 if (res) {
735 if (res == -ENODEV) {
736 tb_dbg(port->sw->tb, " Port %d: not implemented\n",
737 port->port);
738 port->disabled = true;
739 return 0;
740 }
741 return res;
742 }
743
744 /* Port 0 is the switch itself and has no PHY. */
745 if (port->config.type == TB_TYPE_PORT) {
746 cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
747
748 if (cap > 0)
749 port->cap_phy = cap;
750 else
751 tb_port_WARN(port, "non switch port without a PHY\n");
752
753 cap = tb_port_find_cap(port, TB_PORT_CAP_USB4);
754 if (cap > 0)
755 port->cap_usb4 = cap;
756
757 /*
758 * USB4 port buffers allocated for the control path
759 * can be read from the path config space. Legacy
760 * devices use hard-coded value.
761 */
762 if (port->cap_usb4) {
763 struct tb_regs_hop hop;
764
765 if (!tb_port_read(port, &hop, TB_CFG_HOPS, 0, 2))
766 port->ctl_credits = hop.initial_credits;
767 }
768 if (!port->ctl_credits)
769 port->ctl_credits = 2;
770
771 } else {
772 cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
773 if (cap > 0)
774 port->cap_adap = cap;
775 }
776
777 port->total_credits =
778 (port->config.nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
779 ADP_CS_4_TOTAL_BUFFERS_SHIFT;
780
781 tb_dump_port(port->sw->tb, port);
782 return 0;
783}
784
785static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,
786 int max_hopid)
787{
788 int port_max_hopid;
789 struct ida *ida;
790
791 if (in) {
792 port_max_hopid = port->config.max_in_hop_id;
793 ida = &port->in_hopids;
794 } else {
795 port_max_hopid = port->config.max_out_hop_id;
796 ida = &port->out_hopids;
797 }
798
799 /*
800 * NHI can use HopIDs 1-max for other adapters HopIDs 0-7 are
801 * reserved.
802 */
803 if (!tb_port_is_nhi(port) && min_hopid < TB_PATH_MIN_HOPID)
804 min_hopid = TB_PATH_MIN_HOPID;
805
806 if (max_hopid < 0 || max_hopid > port_max_hopid)
807 max_hopid = port_max_hopid;
808
809 return ida_alloc_range(ida, min_hopid, max_hopid, GFP_KERNEL);
810}
811
812/**
813 * tb_port_alloc_in_hopid() - Allocate input HopID from port
814 * @port: Port to allocate HopID for
815 * @min_hopid: Minimum acceptable input HopID
816 * @max_hopid: Maximum acceptable input HopID
817 *
818 * Return: HopID between @min_hopid and @max_hopid or negative errno in
819 * case of error.
820 */
821int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)
822{
823 return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);
824}
825
826/**
827 * tb_port_alloc_out_hopid() - Allocate output HopID from port
828 * @port: Port to allocate HopID for
829 * @min_hopid: Minimum acceptable output HopID
830 * @max_hopid: Maximum acceptable output HopID
831 *
832 * Return: HopID between @min_hopid and @max_hopid or negative errno in
833 * case of error.
834 */
835int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)
836{
837 return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);
838}
839
840/**
841 * tb_port_release_in_hopid() - Release allocated input HopID from port
842 * @port: Port whose HopID to release
843 * @hopid: HopID to release
844 */
845void tb_port_release_in_hopid(struct tb_port *port, int hopid)
846{
847 ida_free(&port->in_hopids, hopid);
848}
849
850/**
851 * tb_port_release_out_hopid() - Release allocated output HopID from port
852 * @port: Port whose HopID to release
853 * @hopid: HopID to release
854 */
855void tb_port_release_out_hopid(struct tb_port *port, int hopid)
856{
857 ida_free(&port->out_hopids, hopid);
858}
859
860static inline bool tb_switch_is_reachable(const struct tb_switch *parent,
861 const struct tb_switch *sw)
862{
863 u64 mask = (1ULL << parent->config.depth * 8) - 1;
864 return (tb_route(parent) & mask) == (tb_route(sw) & mask);
865}
866
867/**
868 * tb_next_port_on_path() - Return next port for given port on a path
869 * @start: Start port of the walk
870 * @end: End port of the walk
871 * @prev: Previous port (%NULL if this is the first)
872 *
873 * This function can be used to walk from one port to another if they
874 * are connected through zero or more switches. If the @prev is dual
875 * link port, the function follows that link and returns another end on
876 * that same link.
877 *
878 * Domain tb->lock must be held when this function is called.
879 *
880 * Return: Pointer to &struct tb_port, %NULL if the @end port has been reached.
881 */
882struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
883 struct tb_port *prev)
884{
885 struct tb_port *next;
886
887 if (!prev)
888 return start;
889
890 if (prev->sw == end->sw) {
891 if (prev == end)
892 return NULL;
893 return end;
894 }
895
896 if (tb_switch_is_reachable(prev->sw, end->sw)) {
897 next = tb_port_at(tb_route(end->sw), prev->sw);
898 /* Walk down the topology if next == prev */
899 if (prev->remote &&
900 (next == prev || next->dual_link_port == prev))
901 next = prev->remote;
902 } else {
903 if (tb_is_upstream_port(prev)) {
904 next = prev->remote;
905 } else {
906 next = tb_upstream_port(prev->sw);
907 /*
908 * Keep the same link if prev and next are both
909 * dual link ports.
910 */
911 if (next->dual_link_port &&
912 next->link_nr != prev->link_nr) {
913 next = next->dual_link_port;
914 }
915 }
916 }
917
918 return next != prev ? next : NULL;
919}
920
921/**
922 * tb_port_get_link_speed() - Get current link speed
923 * @port: Port to check (USB4 or CIO)
924 *
925 * Return: Link speed in Gb/s or negative errno in case of failure.
926 */
927int tb_port_get_link_speed(struct tb_port *port)
928{
929 u32 val, speed;
930 int ret;
931
932 if (!port->cap_phy)
933 return -EINVAL;
934
935 ret = tb_port_read(port, &val, TB_CFG_PORT,
936 port->cap_phy + LANE_ADP_CS_1, 1);
937 if (ret)
938 return ret;
939
940 speed = (val & LANE_ADP_CS_1_CURRENT_SPEED_MASK) >>
941 LANE_ADP_CS_1_CURRENT_SPEED_SHIFT;
942
943 switch (speed) {
944 case LANE_ADP_CS_1_CURRENT_SPEED_GEN4:
945 return 40;
946 case LANE_ADP_CS_1_CURRENT_SPEED_GEN3:
947 return 20;
948 default:
949 return 10;
950 }
951}
952
953/**
954 * tb_port_get_link_generation() - Returns link generation
955 * @port: Lane adapter
956 *
957 * Return: Link generation as a number or negative errno in case of
958 * failure.
959 *
960 * Does not distinguish between Thunderbolt 1 and Thunderbolt 2
961 * links so for those always returns %2.
962 */
963int tb_port_get_link_generation(struct tb_port *port)
964{
965 int ret;
966
967 ret = tb_port_get_link_speed(port);
968 if (ret < 0)
969 return ret;
970
971 switch (ret) {
972 case 40:
973 return 4;
974 case 20:
975 return 3;
976 default:
977 return 2;
978 }
979}
980
981/**
982 * tb_port_get_link_width() - Get current link width
983 * @port: Port to check (USB4 or CIO)
984 *
985 * Return: Link width encoded in &enum tb_link_width or
986 * negative errno in case of failure.
987 */
988int tb_port_get_link_width(struct tb_port *port)
989{
990 u32 val;
991 int ret;
992
993 if (!port->cap_phy)
994 return -EINVAL;
995
996 ret = tb_port_read(port, &val, TB_CFG_PORT,
997 port->cap_phy + LANE_ADP_CS_1, 1);
998 if (ret)
999 return ret;
1000
1001 /* Matches the values in enum tb_link_width */
1002 return (val & LANE_ADP_CS_1_CURRENT_WIDTH_MASK) >>
1003 LANE_ADP_CS_1_CURRENT_WIDTH_SHIFT;
1004}
1005
1006/**
1007 * tb_port_width_supported() - Is the given link width supported
1008 * @port: Port to check
1009 * @width: Widths to check (bitmask)
1010 *
1011 * Can be called to any lane adapter. Checks if given @width is
1012 * supported by the hardware.
1013 *
1014 * Return: %true if link width is supported, %false otherwise.
1015 */
1016bool tb_port_width_supported(struct tb_port *port, unsigned int width)
1017{
1018 u32 phy, widths;
1019 int ret;
1020
1021 if (!port->cap_phy)
1022 return false;
1023
1024 if (width & (TB_LINK_WIDTH_ASYM_TX | TB_LINK_WIDTH_ASYM_RX)) {
1025 if (tb_port_get_link_generation(port) < 4 ||
1026 !usb4_port_asym_supported(port))
1027 return false;
1028 }
1029
1030 ret = tb_port_read(port, &phy, TB_CFG_PORT,
1031 port->cap_phy + LANE_ADP_CS_0, 1);
1032 if (ret)
1033 return false;
1034
1035 /*
1036 * The field encoding is the same as &enum tb_link_width (which is
1037 * passed to @width).
1038 */
1039 widths = FIELD_GET(LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK, phy);
1040 return widths & width;
1041}
1042
1043/**
1044 * tb_port_set_link_width() - Set target link width of the lane adapter
1045 * @port: Lane adapter
1046 * @width: Target link width
1047 *
1048 * Sets the target link width of the lane adapter to @width. Does not
1049 * enable/disable lane bonding. For that call tb_port_set_lane_bonding().
1050 *
1051 * Return: %0 on success, negative errno otherwise.
1052 */
1053int tb_port_set_link_width(struct tb_port *port, enum tb_link_width width)
1054{
1055 u32 val;
1056 int ret;
1057
1058 if (!port->cap_phy)
1059 return -EINVAL;
1060
1061 ret = tb_port_read(port, &val, TB_CFG_PORT,
1062 port->cap_phy + LANE_ADP_CS_1, 1);
1063 if (ret)
1064 return ret;
1065
1066 val &= ~LANE_ADP_CS_1_TARGET_WIDTH_MASK;
1067 switch (width) {
1068 case TB_LINK_WIDTH_SINGLE:
1069 /* Gen 4 link cannot be single */
1070 if (tb_port_get_link_generation(port) >= 4)
1071 return -EOPNOTSUPP;
1072 val |= LANE_ADP_CS_1_TARGET_WIDTH_SINGLE <<
1073 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
1074 break;
1075
1076 case TB_LINK_WIDTH_DUAL:
1077 if (tb_port_get_link_generation(port) >= 4)
1078 return usb4_port_asym_set_link_width(port, width);
1079 val |= LANE_ADP_CS_1_TARGET_WIDTH_DUAL <<
1080 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
1081 break;
1082
1083 case TB_LINK_WIDTH_ASYM_TX:
1084 case TB_LINK_WIDTH_ASYM_RX:
1085 return usb4_port_asym_set_link_width(port, width);
1086
1087 default:
1088 return -EINVAL;
1089 }
1090
1091 return tb_port_write(port, &val, TB_CFG_PORT,
1092 port->cap_phy + LANE_ADP_CS_1, 1);
1093}
1094
1095/**
1096 * tb_port_set_lane_bonding() - Enable/disable lane bonding
1097 * @port: Lane adapter
1098 * @bonding: enable/disable bonding
1099 *
1100 * Enables or disables lane bonding. This should be called after target
1101 * link width has been set (tb_port_set_link_width()). Note in most
1102 * cases one should use tb_port_lane_bonding_enable() instead to enable
1103 * lane bonding.
1104 *
1105 * Return: %0 on success, negative errno otherwise.
1106 */
1107static int tb_port_set_lane_bonding(struct tb_port *port, bool bonding)
1108{
1109 u32 val;
1110 int ret;
1111
1112 if (!port->cap_phy)
1113 return -EINVAL;
1114
1115 ret = tb_port_read(port, &val, TB_CFG_PORT,
1116 port->cap_phy + LANE_ADP_CS_1, 1);
1117 if (ret)
1118 return ret;
1119
1120 if (bonding)
1121 val |= LANE_ADP_CS_1_LB;
1122 else
1123 val &= ~LANE_ADP_CS_1_LB;
1124
1125 return tb_port_write(port, &val, TB_CFG_PORT,
1126 port->cap_phy + LANE_ADP_CS_1, 1);
1127}
1128
1129/**
1130 * tb_port_lane_bonding_enable() - Enable bonding on port
1131 * @port: port to enable
1132 *
1133 * Enable bonding by setting the link width of the port and the other
1134 * port in case of dual link port. Does not wait for the link to
1135 * actually reach the bonded state so caller needs to call
1136 * tb_port_wait_for_link_width() before enabling any paths through the
1137 * link to make sure the link is in expected state.
1138 *
1139 * Return: %0 on success, negative errno otherwise.
1140 */
1141int tb_port_lane_bonding_enable(struct tb_port *port)
1142{
1143 enum tb_link_width width;
1144 int ret;
1145
1146 /*
1147 * Enable lane bonding for both links if not already enabled by
1148 * for example the boot firmware.
1149 */
1150 width = tb_port_get_link_width(port);
1151 if (width == TB_LINK_WIDTH_SINGLE) {
1152 ret = tb_port_set_link_width(port, TB_LINK_WIDTH_DUAL);
1153 if (ret)
1154 goto err_lane0;
1155 }
1156
1157 width = tb_port_get_link_width(port->dual_link_port);
1158 if (width == TB_LINK_WIDTH_SINGLE) {
1159 ret = tb_port_set_link_width(port->dual_link_port,
1160 TB_LINK_WIDTH_DUAL);
1161 if (ret)
1162 goto err_lane1;
1163 }
1164
1165 /*
1166 * Only set bonding if the link was not already bonded. This
1167 * avoids the lane adapter to re-enter bonding state.
1168 */
1169 if (width == TB_LINK_WIDTH_SINGLE && !tb_is_upstream_port(port)) {
1170 ret = tb_port_set_lane_bonding(port, true);
1171 if (ret)
1172 goto err_lane1;
1173 }
1174
1175 /*
1176 * When lane 0 bonding is set it will affect lane 1 too so
1177 * update both.
1178 */
1179 port->bonded = true;
1180 port->dual_link_port->bonded = true;
1181
1182 return 0;
1183
1184err_lane1:
1185 tb_port_set_link_width(port->dual_link_port, TB_LINK_WIDTH_SINGLE);
1186err_lane0:
1187 tb_port_set_link_width(port, TB_LINK_WIDTH_SINGLE);
1188
1189 return ret;
1190}
1191
1192/**
1193 * tb_port_lane_bonding_disable() - Disable bonding on port
1194 * @port: port to disable
1195 *
1196 * Disable bonding by setting the link width of the port and the
1197 * other port in case of dual link port.
1198 */
1199void tb_port_lane_bonding_disable(struct tb_port *port)
1200{
1201 tb_port_set_lane_bonding(port, false);
1202 tb_port_set_link_width(port->dual_link_port, TB_LINK_WIDTH_SINGLE);
1203 tb_port_set_link_width(port, TB_LINK_WIDTH_SINGLE);
1204 port->dual_link_port->bonded = false;
1205 port->bonded = false;
1206}
1207
1208/**
1209 * tb_port_wait_for_link_width() - Wait until link reaches specific width
1210 * @port: Port to wait for
1211 * @width: Expected link width (bitmask)
1212 * @timeout_msec: Timeout in ms how long to wait
1213 *
1214 * Should be used after both ends of the link have been bonded (or
1215 * bonding has been disabled) to wait until the link actually reaches
1216 * the expected state.
1217 *
1218 * Can be passed a mask of expected widths.
1219 *
1220 * Return:
1221 * * %0 - If link reaches any of the specified widths.
1222 * * %-ETIMEDOUT - If link does not reach specified width.
1223 * * Negative errno - Another error occurred.
1224 */
1225int tb_port_wait_for_link_width(struct tb_port *port, unsigned int width,
1226 int timeout_msec)
1227{
1228 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
1229 int ret;
1230
1231 /* Gen 4 link does not support single lane */
1232 if ((width & TB_LINK_WIDTH_SINGLE) &&
1233 tb_port_get_link_generation(port) >= 4)
1234 return -EOPNOTSUPP;
1235
1236 do {
1237 ret = tb_port_get_link_width(port);
1238 if (ret < 0) {
1239 /*
1240 * Sometimes we get port locked error when
1241 * polling the lanes so we can ignore it and
1242 * retry.
1243 */
1244 if (ret != -EACCES)
1245 return ret;
1246 } else if (ret & width) {
1247 return 0;
1248 }
1249
1250 usleep_range(1000, 2000);
1251 } while (ktime_before(ktime_get(), timeout));
1252
1253 return -ETIMEDOUT;
1254}
1255
1256static int tb_port_do_update_credits(struct tb_port *port)
1257{
1258 u32 nfc_credits;
1259 int ret;
1260
1261 ret = tb_port_read(port, &nfc_credits, TB_CFG_PORT, ADP_CS_4, 1);
1262 if (ret)
1263 return ret;
1264
1265 if (nfc_credits != port->config.nfc_credits) {
1266 u32 total;
1267
1268 total = (nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
1269 ADP_CS_4_TOTAL_BUFFERS_SHIFT;
1270
1271 tb_port_dbg(port, "total credits changed %u -> %u\n",
1272 port->total_credits, total);
1273
1274 port->config.nfc_credits = nfc_credits;
1275 port->total_credits = total;
1276 }
1277
1278 return 0;
1279}
1280
1281/**
1282 * tb_port_update_credits() - Re-read port total credits
1283 * @port: Port to update
1284 *
1285 * After the link is bonded (or bonding was disabled) the port total
1286 * credits may change, so this function needs to be called to re-read
1287 * the credits. Updates also the second lane adapter.
1288 *
1289 * Return: %0 on success, negative errno otherwise.
1290 */
1291int tb_port_update_credits(struct tb_port *port)
1292{
1293 int ret;
1294
1295 ret = tb_port_do_update_credits(port);
1296 if (ret)
1297 return ret;
1298
1299 if (!port->dual_link_port)
1300 return 0;
1301 return tb_port_do_update_credits(port->dual_link_port);
1302}
1303
1304static int tb_port_start_lane_initialization(struct tb_port *port)
1305{
1306 int ret;
1307
1308 if (tb_switch_is_usb4(port->sw))
1309 return 0;
1310
1311 ret = tb_lc_start_lane_initialization(port);
1312 return ret == -EINVAL ? 0 : ret;
1313}
1314
1315/*
1316 * Returns true if the port had something (router, XDomain) connected
1317 * before suspend.
1318 */
1319static bool tb_port_resume(struct tb_port *port)
1320{
1321 bool has_remote = tb_port_has_remote(port);
1322
1323 if (port->usb4) {
1324 usb4_port_device_resume(port->usb4);
1325 } else if (!has_remote) {
1326 /*
1327 * For disconnected downstream lane adapters start lane
1328 * initialization now so we detect future connects.
1329 *
1330 * For XDomain start the lane initialzation now so the
1331 * link gets re-established.
1332 *
1333 * This is only needed for non-USB4 ports.
1334 */
1335 if (!tb_is_upstream_port(port) || port->xdomain)
1336 tb_port_start_lane_initialization(port);
1337 }
1338
1339 return has_remote || port->xdomain;
1340}
1341
1342/**
1343 * tb_port_is_enabled() - Is the adapter port enabled
1344 * @port: Port to check
1345 *
1346 * Return: %true if port is enabled, %false otherwise.
1347 */
1348bool tb_port_is_enabled(struct tb_port *port)
1349{
1350 switch (port->config.type) {
1351 case TB_TYPE_PCIE_UP:
1352 case TB_TYPE_PCIE_DOWN:
1353 return tb_pci_port_is_enabled(port);
1354
1355 case TB_TYPE_DP_HDMI_IN:
1356 case TB_TYPE_DP_HDMI_OUT:
1357 return tb_dp_port_is_enabled(port);
1358
1359 case TB_TYPE_USB3_UP:
1360 case TB_TYPE_USB3_DOWN:
1361 return tb_usb3_port_is_enabled(port);
1362
1363 default:
1364 return false;
1365 }
1366}
1367
1368/**
1369 * tb_usb3_port_is_enabled() - Is the USB3 adapter port enabled
1370 * @port: USB3 adapter port to check
1371 *
1372 * Return: %true if port is enabled, %false otherwise.
1373 */
1374bool tb_usb3_port_is_enabled(struct tb_port *port)
1375{
1376 u32 data;
1377
1378 if (tb_port_read(port, &data, TB_CFG_PORT,
1379 port->cap_adap + ADP_USB3_CS_0, 1))
1380 return false;
1381
1382 return !!(data & ADP_USB3_CS_0_PE);
1383}
1384
1385/**
1386 * tb_usb3_port_enable() - Enable USB3 adapter port
1387 * @port: USB3 adapter port to enable
1388 * @enable: Enable/disable the USB3 adapter
1389 *
1390 * Return: %0 on success, negative errno otherwise.
1391 */
1392int tb_usb3_port_enable(struct tb_port *port, bool enable)
1393{
1394 u32 word = enable ? (ADP_USB3_CS_0_PE | ADP_USB3_CS_0_V)
1395 : ADP_USB3_CS_0_V;
1396
1397 if (!port->cap_adap)
1398 return -ENXIO;
1399 return tb_port_write(port, &word, TB_CFG_PORT,
1400 port->cap_adap + ADP_USB3_CS_0, 1);
1401}
1402
1403/**
1404 * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
1405 * @port: PCIe port to check
1406 *
1407 * Return: %true if port is enabled, %false otherwise.
1408 */
1409bool tb_pci_port_is_enabled(struct tb_port *port)
1410{
1411 u32 data;
1412
1413 if (tb_port_read(port, &data, TB_CFG_PORT,
1414 port->cap_adap + ADP_PCIE_CS_0, 1))
1415 return false;
1416
1417 return !!(data & ADP_PCIE_CS_0_PE);
1418}
1419
1420/**
1421 * tb_pci_port_enable() - Enable PCIe adapter port
1422 * @port: PCIe port to enable
1423 * @enable: Enable/disable the PCIe adapter
1424 *
1425 * Return: %0 on success, negative errno otherwise.
1426 */
1427int tb_pci_port_enable(struct tb_port *port, bool enable)
1428{
1429 u32 word = enable ? ADP_PCIE_CS_0_PE : 0x0;
1430 if (!port->cap_adap)
1431 return -ENXIO;
1432 return tb_port_write(port, &word, TB_CFG_PORT,
1433 port->cap_adap + ADP_PCIE_CS_0, 1);
1434}
1435
1436/**
1437 * tb_dp_port_hpd_is_active() - Is HPD already active
1438 * @port: DP out port to check
1439 *
1440 * Checks if the DP OUT adapter port has HPD bit already set.
1441 *
1442 * Return: %1 if HPD is active, %0 otherwise.
1443 */
1444int tb_dp_port_hpd_is_active(struct tb_port *port)
1445{
1446 u32 data;
1447 int ret;
1448
1449 ret = tb_port_read(port, &data, TB_CFG_PORT,
1450 port->cap_adap + ADP_DP_CS_2, 1);
1451 if (ret)
1452 return ret;
1453
1454 return !!(data & ADP_DP_CS_2_HPD);
1455}
1456
1457/**
1458 * tb_dp_port_hpd_clear() - Clear HPD from DP IN port
1459 * @port: Port to clear HPD
1460 *
1461 * If the DP IN port has HPD set, this function can be used to clear it.
1462 *
1463 * Return: %0 on success, negative errno otherwise.
1464 */
1465int tb_dp_port_hpd_clear(struct tb_port *port)
1466{
1467 u32 data;
1468 int ret;
1469
1470 ret = tb_port_read(port, &data, TB_CFG_PORT,
1471 port->cap_adap + ADP_DP_CS_3, 1);
1472 if (ret)
1473 return ret;
1474
1475 data |= ADP_DP_CS_3_HPDC;
1476 return tb_port_write(port, &data, TB_CFG_PORT,
1477 port->cap_adap + ADP_DP_CS_3, 1);
1478}
1479
1480/**
1481 * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
1482 * @port: DP IN/OUT port to set hops
1483 * @video: Video Hop ID
1484 * @aux_tx: AUX TX Hop ID
1485 * @aux_rx: AUX RX Hop ID
1486 *
1487 * Programs specified Hop IDs for DP IN/OUT port. Can be called for USB4
1488 * router DP adapters too but does not program the values as the fields
1489 * are read-only.
1490 *
1491 * Return: %0 on success, negative errno otherwise.
1492 */
1493int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
1494 unsigned int aux_tx, unsigned int aux_rx)
1495{
1496 u32 data[2];
1497 int ret;
1498
1499 if (tb_switch_is_usb4(port->sw))
1500 return 0;
1501
1502 ret = tb_port_read(port, data, TB_CFG_PORT,
1503 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1504 if (ret)
1505 return ret;
1506
1507 data[0] &= ~ADP_DP_CS_0_VIDEO_HOPID_MASK;
1508 data[1] &= ~ADP_DP_CS_1_AUX_TX_HOPID_MASK;
1509 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1510
1511 data[0] |= (video << ADP_DP_CS_0_VIDEO_HOPID_SHIFT) &
1512 ADP_DP_CS_0_VIDEO_HOPID_MASK;
1513 data[1] |= aux_tx & ADP_DP_CS_1_AUX_TX_HOPID_MASK;
1514 data[1] |= (aux_rx << ADP_DP_CS_1_AUX_RX_HOPID_SHIFT) &
1515 ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1516
1517 return tb_port_write(port, data, TB_CFG_PORT,
1518 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1519}
1520
1521/**
1522 * tb_dp_port_is_enabled() - Is DP adapter port enabled
1523 * @port: DP adapter port to check
1524 *
1525 * Return: %true if DP port is enabled, %false otherwise.
1526 */
1527bool tb_dp_port_is_enabled(struct tb_port *port)
1528{
1529 u32 data[2];
1530
1531 if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap + ADP_DP_CS_0,
1532 ARRAY_SIZE(data)))
1533 return false;
1534
1535 return !!(data[0] & (ADP_DP_CS_0_VE | ADP_DP_CS_0_AE));
1536}
1537
1538/**
1539 * tb_dp_port_enable() - Enables/disables DP paths of a port
1540 * @port: DP IN/OUT port
1541 * @enable: Enable/disable DP path
1542 *
1543 * Once Hop IDs are programmed DP paths can be enabled or disabled by
1544 * calling this function.
1545 *
1546 * Return: %0 on success, negative errno otherwise.
1547 */
1548int tb_dp_port_enable(struct tb_port *port, bool enable)
1549{
1550 u32 data[2];
1551 int ret;
1552
1553 ret = tb_port_read(port, data, TB_CFG_PORT,
1554 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1555 if (ret)
1556 return ret;
1557
1558 if (enable)
1559 data[0] |= ADP_DP_CS_0_VE | ADP_DP_CS_0_AE;
1560 else
1561 data[0] &= ~(ADP_DP_CS_0_VE | ADP_DP_CS_0_AE);
1562
1563 return tb_port_write(port, data, TB_CFG_PORT,
1564 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1565}
1566
1567/* switch utility functions */
1568
1569static const char *tb_switch_generation_name(const struct tb_switch *sw)
1570{
1571 switch (sw->generation) {
1572 case 1:
1573 return "Thunderbolt 1";
1574 case 2:
1575 return "Thunderbolt 2";
1576 case 3:
1577 return "Thunderbolt 3";
1578 case 4:
1579 return "USB4";
1580 default:
1581 return "Unknown";
1582 }
1583}
1584
1585static void tb_dump_switch(const struct tb *tb, const struct tb_switch *sw)
1586{
1587 const struct tb_regs_switch_header *regs = &sw->config;
1588
1589 tb_dbg(tb, " %s Switch: %x:%x (Revision: %d, TB Version: %d)\n",
1590 tb_switch_generation_name(sw), regs->vendor_id, regs->device_id,
1591 regs->revision, regs->thunderbolt_version);
1592 tb_dbg(tb, " Max Port Number: %d\n", regs->max_port_number);
1593 tb_dbg(tb, " Config:\n");
1594 tb_dbg(tb,
1595 " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
1596 regs->upstream_port_number, regs->depth,
1597 (((u64) regs->route_hi) << 32) | regs->route_lo,
1598 regs->enabled, regs->plug_events_delay);
1599 tb_dbg(tb, " unknown1: %#x unknown4: %#x\n",
1600 regs->__unknown1, regs->__unknown4);
1601}
1602
1603static int tb_switch_reset_host(struct tb_switch *sw)
1604{
1605 if (sw->generation > 1) {
1606 struct tb_port *port;
1607
1608 tb_switch_for_each_port(sw, port) {
1609 int i, ret;
1610
1611 /*
1612 * For lane adapters we issue downstream port
1613 * reset and clear up path config spaces.
1614 *
1615 * For protocol adapters we disable the path and
1616 * clear path config space one by one (from 8 to
1617 * Max Input HopID of the adapter).
1618 */
1619 if (tb_port_is_null(port) && !tb_is_upstream_port(port)) {
1620 ret = tb_port_reset(port);
1621 if (ret)
1622 return ret;
1623 } else if (tb_port_is_usb3_down(port) ||
1624 tb_port_is_usb3_up(port)) {
1625 tb_usb3_port_enable(port, false);
1626 } else if (tb_port_is_dpin(port) ||
1627 tb_port_is_dpout(port)) {
1628 tb_dp_port_enable(port, false);
1629 } else if (tb_port_is_pcie_down(port) ||
1630 tb_port_is_pcie_up(port)) {
1631 tb_pci_port_enable(port, false);
1632 } else {
1633 continue;
1634 }
1635
1636 /* Cleanup path config space of protocol adapter */
1637 for (i = TB_PATH_MIN_HOPID;
1638 i <= port->config.max_in_hop_id; i++) {
1639 ret = tb_path_deactivate_hop(port, i);
1640 if (ret)
1641 return ret;
1642 }
1643 }
1644 } else {
1645 struct tb_cfg_result res;
1646
1647 /* Thunderbolt 1 uses the "reset" config space packet */
1648 res.err = tb_sw_write(sw, ((u32 *) &sw->config) + 2,
1649 TB_CFG_SWITCH, 2, 2);
1650 if (res.err)
1651 return res.err;
1652 res = tb_cfg_reset(sw->tb->ctl, tb_route(sw));
1653 if (res.err > 0)
1654 return -EIO;
1655 else if (res.err < 0)
1656 return res.err;
1657 }
1658
1659 return 0;
1660}
1661
1662static int tb_switch_reset_device(struct tb_switch *sw)
1663{
1664 return tb_port_reset(tb_switch_downstream_port(sw));
1665}
1666
1667static bool tb_switch_enumerated(struct tb_switch *sw)
1668{
1669 u32 val;
1670 int ret;
1671
1672 /*
1673 * Read directly from the hardware because we use this also
1674 * during system sleep where sw->config.enabled is already set
1675 * by us.
1676 */
1677 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_3, 1);
1678 if (ret)
1679 return false;
1680
1681 return !!(val & ROUTER_CS_3_V);
1682}
1683
1684/**
1685 * tb_switch_reset() - Perform reset to the router
1686 * @sw: Router to reset
1687 *
1688 * Issues reset to the router @sw. Can be used for any router. For host
1689 * routers, resets all the downstream ports and cleans up path config
1690 * spaces accordingly. For device routers issues downstream port reset
1691 * through the parent router, so as side effect there will be unplug
1692 * soon after this is finished.
1693 *
1694 * If the router is not enumerated does nothing.
1695 *
1696 * Return: %0 on success, negative errno otherwise.
1697 */
1698int tb_switch_reset(struct tb_switch *sw)
1699{
1700 int ret;
1701
1702 /*
1703 * We cannot access the port config spaces unless the router is
1704 * already enumerated. If the router is not enumerated it is
1705 * equal to being reset so we can skip that here.
1706 */
1707 if (!tb_switch_enumerated(sw))
1708 return 0;
1709
1710 tb_sw_dbg(sw, "resetting\n");
1711
1712 if (tb_route(sw))
1713 ret = tb_switch_reset_device(sw);
1714 else
1715 ret = tb_switch_reset_host(sw);
1716
1717 if (ret)
1718 tb_sw_warn(sw, "failed to reset\n");
1719
1720 return ret;
1721}
1722
1723/**
1724 * tb_switch_wait_for_bit() - Wait for specified value of bits in offset
1725 * @sw: Router to read the offset value from
1726 * @offset: Offset in the router config space to read from
1727 * @bit: Bit mask in the offset to wait for
1728 * @value: Value of the bits to wait for
1729 * @timeout_msec: Timeout in ms how long to wait
1730 *
1731 * Wait till the specified bits in specified offset reach specified value.
1732 *
1733 * Return:
1734 * * %0 - On success.
1735 * * %-ETIMEDOUT - If the @value was not reached within
1736 * the given timeout.
1737 * * Negative errno - In case of failure.
1738 */
1739int tb_switch_wait_for_bit(struct tb_switch *sw, u32 offset, u32 bit,
1740 u32 value, int timeout_msec)
1741{
1742 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
1743
1744 do {
1745 u32 val;
1746 int ret;
1747
1748 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
1749 if (ret)
1750 return ret;
1751
1752 if ((val & bit) == value)
1753 return 0;
1754
1755 usleep_range(50, 100);
1756 } while (ktime_before(ktime_get(), timeout));
1757
1758 return -ETIMEDOUT;
1759}
1760
1761/*
1762 * tb_plug_events_active() - enable/disable plug events on a switch
1763 *
1764 * Also configures a sane plug_events_delay of 255ms.
1765 *
1766 * Return: %0 on success, negative errno otherwise.
1767 */
1768static int tb_plug_events_active(struct tb_switch *sw, bool active)
1769{
1770 u32 data;
1771 int res;
1772
1773 if (tb_switch_is_icm(sw) || tb_switch_is_usb4(sw))
1774 return 0;
1775
1776 sw->config.plug_events_delay = 0xff;
1777 res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
1778 if (res)
1779 return res;
1780
1781 res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
1782 if (res)
1783 return res;
1784
1785 if (active) {
1786 data = data & 0xFFFFFF83;
1787 switch (sw->config.device_id) {
1788 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1789 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1790 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1791 break;
1792 default:
1793 /*
1794 * Skip Alpine Ridge, it needs to have vendor
1795 * specific USB hotplug event enabled for the
1796 * internal xHCI to work.
1797 */
1798 if (!tb_switch_is_alpine_ridge(sw))
1799 data |= TB_PLUG_EVENTS_USB_DISABLE;
1800 }
1801 } else {
1802 data = data | 0x7c;
1803 }
1804 return tb_sw_write(sw, &data, TB_CFG_SWITCH,
1805 sw->cap_plug_events + 1, 1);
1806}
1807
1808static ssize_t authorized_show(struct device *dev,
1809 struct device_attribute *attr,
1810 char *buf)
1811{
1812 struct tb_switch *sw = tb_to_switch(dev);
1813
1814 return sysfs_emit(buf, "%u\n", sw->authorized);
1815}
1816
1817static int disapprove_switch(struct device *dev, void *not_used)
1818{
1819 char *envp[] = { "AUTHORIZED=0", NULL };
1820 struct tb_switch *sw;
1821
1822 sw = tb_to_switch(dev);
1823 if (sw && sw->authorized) {
1824 int ret;
1825
1826 /* First children */
1827 ret = device_for_each_child_reverse(&sw->dev, NULL, disapprove_switch);
1828 if (ret)
1829 return ret;
1830
1831 ret = tb_domain_disapprove_switch(sw->tb, sw);
1832 if (ret)
1833 return ret;
1834
1835 sw->authorized = 0;
1836 kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);
1837 }
1838
1839 return 0;
1840}
1841
1842static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
1843{
1844 char envp_string[13];
1845 int ret = -EINVAL;
1846 char *envp[] = { envp_string, NULL };
1847
1848 if (!mutex_trylock(&sw->tb->lock))
1849 return restart_syscall();
1850
1851 if (!!sw->authorized == !!val)
1852 goto unlock;
1853
1854 switch (val) {
1855 /* Disapprove switch */
1856 case 0:
1857 if (tb_route(sw)) {
1858 ret = disapprove_switch(&sw->dev, NULL);
1859 goto unlock;
1860 }
1861 break;
1862
1863 /* Approve switch */
1864 case 1:
1865 if (sw->key)
1866 ret = tb_domain_approve_switch_key(sw->tb, sw);
1867 else
1868 ret = tb_domain_approve_switch(sw->tb, sw);
1869 break;
1870
1871 /* Challenge switch */
1872 case 2:
1873 if (sw->key)
1874 ret = tb_domain_challenge_switch_key(sw->tb, sw);
1875 break;
1876
1877 default:
1878 break;
1879 }
1880
1881 if (!ret) {
1882 sw->authorized = val;
1883 /*
1884 * Notify status change to the userspace, informing the new
1885 * value of /sys/bus/thunderbolt/devices/.../authorized.
1886 */
1887 sprintf(envp_string, "AUTHORIZED=%u", sw->authorized);
1888 kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);
1889 }
1890
1891unlock:
1892 mutex_unlock(&sw->tb->lock);
1893 return ret;
1894}
1895
1896static ssize_t authorized_store(struct device *dev,
1897 struct device_attribute *attr,
1898 const char *buf, size_t count)
1899{
1900 struct tb_switch *sw = tb_to_switch(dev);
1901 unsigned int val;
1902 ssize_t ret;
1903
1904 ret = kstrtouint(buf, 0, &val);
1905 if (ret)
1906 return ret;
1907 if (val > 2)
1908 return -EINVAL;
1909
1910 pm_runtime_get_sync(&sw->dev);
1911 ret = tb_switch_set_authorized(sw, val);
1912 pm_runtime_mark_last_busy(&sw->dev);
1913 pm_runtime_put_autosuspend(&sw->dev);
1914
1915 return ret ? ret : count;
1916}
1917static DEVICE_ATTR_RW(authorized);
1918
1919static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
1920 char *buf)
1921{
1922 struct tb_switch *sw = tb_to_switch(dev);
1923
1924 return sysfs_emit(buf, "%u\n", sw->boot);
1925}
1926static DEVICE_ATTR_RO(boot);
1927
1928static ssize_t device_show(struct device *dev, struct device_attribute *attr,
1929 char *buf)
1930{
1931 struct tb_switch *sw = tb_to_switch(dev);
1932
1933 return sysfs_emit(buf, "%#x\n", sw->device);
1934}
1935static DEVICE_ATTR_RO(device);
1936
1937static ssize_t
1938device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1939{
1940 struct tb_switch *sw = tb_to_switch(dev);
1941
1942 return sysfs_emit(buf, "%s\n", sw->device_name ?: "");
1943}
1944static DEVICE_ATTR_RO(device_name);
1945
1946static ssize_t
1947generation_show(struct device *dev, struct device_attribute *attr, char *buf)
1948{
1949 struct tb_switch *sw = tb_to_switch(dev);
1950
1951 return sysfs_emit(buf, "%u\n", sw->generation);
1952}
1953static DEVICE_ATTR_RO(generation);
1954
1955static ssize_t key_show(struct device *dev, struct device_attribute *attr,
1956 char *buf)
1957{
1958 struct tb_switch *sw = tb_to_switch(dev);
1959 ssize_t ret;
1960
1961 if (!mutex_trylock(&sw->tb->lock))
1962 return restart_syscall();
1963
1964 if (sw->key)
1965 ret = sysfs_emit(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
1966 else
1967 ret = sysfs_emit(buf, "\n");
1968
1969 mutex_unlock(&sw->tb->lock);
1970 return ret;
1971}
1972
1973static ssize_t key_store(struct device *dev, struct device_attribute *attr,
1974 const char *buf, size_t count)
1975{
1976 struct tb_switch *sw = tb_to_switch(dev);
1977 u8 key[TB_SWITCH_KEY_SIZE];
1978 ssize_t ret = count;
1979 bool clear = false;
1980
1981 if (!strcmp(buf, "\n"))
1982 clear = true;
1983 else if (hex2bin(key, buf, sizeof(key)))
1984 return -EINVAL;
1985
1986 if (!mutex_trylock(&sw->tb->lock))
1987 return restart_syscall();
1988
1989 if (sw->authorized) {
1990 ret = -EBUSY;
1991 } else {
1992 kfree(sw->key);
1993 if (clear) {
1994 sw->key = NULL;
1995 } else {
1996 sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
1997 if (!sw->key)
1998 ret = -ENOMEM;
1999 }
2000 }
2001
2002 mutex_unlock(&sw->tb->lock);
2003 return ret;
2004}
2005static DEVICE_ATTR(key, 0600, key_show, key_store);
2006
2007static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
2008 char *buf)
2009{
2010 struct tb_switch *sw = tb_to_switch(dev);
2011
2012 return sysfs_emit(buf, "%u.0 Gb/s\n", sw->link_speed);
2013}
2014
2015/*
2016 * Currently all lanes must run at the same speed but we expose here
2017 * both directions to allow possible asymmetric links in the future.
2018 */
2019static DEVICE_ATTR(rx_speed, 0444, speed_show, NULL);
2020static DEVICE_ATTR(tx_speed, 0444, speed_show, NULL);
2021
2022static ssize_t rx_lanes_show(struct device *dev, struct device_attribute *attr,
2023 char *buf)
2024{
2025 struct tb_switch *sw = tb_to_switch(dev);
2026 unsigned int width;
2027
2028 switch (sw->link_width) {
2029 case TB_LINK_WIDTH_SINGLE:
2030 case TB_LINK_WIDTH_ASYM_TX:
2031 width = 1;
2032 break;
2033 case TB_LINK_WIDTH_DUAL:
2034 width = 2;
2035 break;
2036 case TB_LINK_WIDTH_ASYM_RX:
2037 width = 3;
2038 break;
2039 default:
2040 WARN_ON_ONCE(1);
2041 return -EINVAL;
2042 }
2043
2044 return sysfs_emit(buf, "%u\n", width);
2045}
2046static DEVICE_ATTR(rx_lanes, 0444, rx_lanes_show, NULL);
2047
2048static ssize_t tx_lanes_show(struct device *dev, struct device_attribute *attr,
2049 char *buf)
2050{
2051 struct tb_switch *sw = tb_to_switch(dev);
2052 unsigned int width;
2053
2054 switch (sw->link_width) {
2055 case TB_LINK_WIDTH_SINGLE:
2056 case TB_LINK_WIDTH_ASYM_RX:
2057 width = 1;
2058 break;
2059 case TB_LINK_WIDTH_DUAL:
2060 width = 2;
2061 break;
2062 case TB_LINK_WIDTH_ASYM_TX:
2063 width = 3;
2064 break;
2065 default:
2066 WARN_ON_ONCE(1);
2067 return -EINVAL;
2068 }
2069
2070 return sysfs_emit(buf, "%u\n", width);
2071}
2072static DEVICE_ATTR(tx_lanes, 0444, tx_lanes_show, NULL);
2073
2074static ssize_t nvm_authenticate_show(struct device *dev,
2075 struct device_attribute *attr, char *buf)
2076{
2077 struct tb_switch *sw = tb_to_switch(dev);
2078 u32 status;
2079
2080 nvm_get_auth_status(sw, &status);
2081 return sysfs_emit(buf, "%#x\n", status);
2082}
2083
2084static ssize_t nvm_authenticate_sysfs(struct device *dev, const char *buf,
2085 bool disconnect)
2086{
2087 struct tb_switch *sw = tb_to_switch(dev);
2088 int val, ret;
2089
2090 pm_runtime_get_sync(&sw->dev);
2091
2092 if (!mutex_trylock(&sw->tb->lock)) {
2093 ret = restart_syscall();
2094 goto exit_rpm;
2095 }
2096
2097 if (sw->no_nvm_upgrade) {
2098 ret = -EOPNOTSUPP;
2099 goto exit_unlock;
2100 }
2101
2102 /* If NVMem devices are not yet added */
2103 if (!sw->nvm) {
2104 ret = -EAGAIN;
2105 goto exit_unlock;
2106 }
2107
2108 ret = kstrtoint(buf, 10, &val);
2109 if (ret)
2110 goto exit_unlock;
2111
2112 /* Always clear the authentication status */
2113 nvm_clear_auth_status(sw);
2114
2115 if (val > 0) {
2116 if (val == AUTHENTICATE_ONLY) {
2117 if (disconnect)
2118 ret = -EINVAL;
2119 else
2120 ret = nvm_authenticate(sw, true);
2121 } else {
2122 if (!sw->nvm->flushed) {
2123 if (!sw->nvm->buf) {
2124 ret = -EINVAL;
2125 goto exit_unlock;
2126 }
2127
2128 ret = nvm_validate_and_write(sw);
2129 if (ret || val == WRITE_ONLY)
2130 goto exit_unlock;
2131 }
2132 if (val == WRITE_AND_AUTHENTICATE) {
2133 if (disconnect)
2134 ret = tb_lc_force_power(sw);
2135 else
2136 ret = nvm_authenticate(sw, false);
2137 }
2138 }
2139 }
2140
2141exit_unlock:
2142 mutex_unlock(&sw->tb->lock);
2143exit_rpm:
2144 pm_runtime_mark_last_busy(&sw->dev);
2145 pm_runtime_put_autosuspend(&sw->dev);
2146
2147 return ret;
2148}
2149
2150static ssize_t nvm_authenticate_store(struct device *dev,
2151 struct device_attribute *attr, const char *buf, size_t count)
2152{
2153 int ret = nvm_authenticate_sysfs(dev, buf, false);
2154 if (ret)
2155 return ret;
2156 return count;
2157}
2158static DEVICE_ATTR_RW(nvm_authenticate);
2159
2160static ssize_t nvm_authenticate_on_disconnect_show(struct device *dev,
2161 struct device_attribute *attr, char *buf)
2162{
2163 return nvm_authenticate_show(dev, attr, buf);
2164}
2165
2166static ssize_t nvm_authenticate_on_disconnect_store(struct device *dev,
2167 struct device_attribute *attr, const char *buf, size_t count)
2168{
2169 int ret;
2170
2171 ret = nvm_authenticate_sysfs(dev, buf, true);
2172 return ret ? ret : count;
2173}
2174static DEVICE_ATTR_RW(nvm_authenticate_on_disconnect);
2175
2176static ssize_t nvm_version_show(struct device *dev,
2177 struct device_attribute *attr, char *buf)
2178{
2179 struct tb_switch *sw = tb_to_switch(dev);
2180 int ret;
2181
2182 if (!mutex_trylock(&sw->tb->lock))
2183 return restart_syscall();
2184
2185 if (sw->safe_mode)
2186 ret = -ENODATA;
2187 else if (!sw->nvm)
2188 ret = -EAGAIN;
2189 else
2190 ret = sysfs_emit(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
2191
2192 mutex_unlock(&sw->tb->lock);
2193
2194 return ret;
2195}
2196static DEVICE_ATTR_RO(nvm_version);
2197
2198static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
2199 char *buf)
2200{
2201 struct tb_switch *sw = tb_to_switch(dev);
2202
2203 return sysfs_emit(buf, "%#x\n", sw->vendor);
2204}
2205static DEVICE_ATTR_RO(vendor);
2206
2207static ssize_t
2208vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
2209{
2210 struct tb_switch *sw = tb_to_switch(dev);
2211
2212 return sysfs_emit(buf, "%s\n", sw->vendor_name ?: "");
2213}
2214static DEVICE_ATTR_RO(vendor_name);
2215
2216static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
2217 char *buf)
2218{
2219 struct tb_switch *sw = tb_to_switch(dev);
2220
2221 return sysfs_emit(buf, "%pUb\n", sw->uuid);
2222}
2223static DEVICE_ATTR_RO(unique_id);
2224
2225static struct attribute *switch_attrs[] = {
2226 &dev_attr_authorized.attr,
2227 &dev_attr_boot.attr,
2228 &dev_attr_device.attr,
2229 &dev_attr_device_name.attr,
2230 &dev_attr_generation.attr,
2231 &dev_attr_key.attr,
2232 &dev_attr_nvm_authenticate.attr,
2233 &dev_attr_nvm_authenticate_on_disconnect.attr,
2234 &dev_attr_nvm_version.attr,
2235 &dev_attr_rx_speed.attr,
2236 &dev_attr_rx_lanes.attr,
2237 &dev_attr_tx_speed.attr,
2238 &dev_attr_tx_lanes.attr,
2239 &dev_attr_vendor.attr,
2240 &dev_attr_vendor_name.attr,
2241 &dev_attr_unique_id.attr,
2242 NULL,
2243};
2244
2245static umode_t switch_attr_is_visible(struct kobject *kobj,
2246 struct attribute *attr, int n)
2247{
2248 struct device *dev = kobj_to_dev(kobj);
2249 struct tb_switch *sw = tb_to_switch(dev);
2250
2251 if (attr == &dev_attr_authorized.attr) {
2252 if (sw->tb->security_level == TB_SECURITY_NOPCIE ||
2253 sw->tb->security_level == TB_SECURITY_DPONLY)
2254 return 0;
2255 } else if (attr == &dev_attr_device.attr) {
2256 if (!sw->device)
2257 return 0;
2258 } else if (attr == &dev_attr_device_name.attr) {
2259 if (!sw->device_name)
2260 return 0;
2261 } else if (attr == &dev_attr_vendor.attr) {
2262 if (!sw->vendor)
2263 return 0;
2264 } else if (attr == &dev_attr_vendor_name.attr) {
2265 if (!sw->vendor_name)
2266 return 0;
2267 } else if (attr == &dev_attr_key.attr) {
2268 if (tb_route(sw) &&
2269 sw->tb->security_level == TB_SECURITY_SECURE &&
2270 sw->security_level == TB_SECURITY_SECURE)
2271 return attr->mode;
2272 return 0;
2273 } else if (attr == &dev_attr_rx_speed.attr ||
2274 attr == &dev_attr_rx_lanes.attr ||
2275 attr == &dev_attr_tx_speed.attr ||
2276 attr == &dev_attr_tx_lanes.attr) {
2277 if (tb_route(sw))
2278 return attr->mode;
2279 return 0;
2280 } else if (attr == &dev_attr_nvm_authenticate.attr) {
2281 if (nvm_upgradeable(sw))
2282 return attr->mode;
2283 return 0;
2284 } else if (attr == &dev_attr_nvm_version.attr) {
2285 if (nvm_readable(sw))
2286 return attr->mode;
2287 return 0;
2288 } else if (attr == &dev_attr_boot.attr) {
2289 if (tb_route(sw))
2290 return attr->mode;
2291 return 0;
2292 } else if (attr == &dev_attr_nvm_authenticate_on_disconnect.attr) {
2293 if (sw->quirks & QUIRK_FORCE_POWER_LINK_CONTROLLER)
2294 return attr->mode;
2295 return 0;
2296 }
2297
2298 return sw->safe_mode ? 0 : attr->mode;
2299}
2300
2301static const struct attribute_group switch_group = {
2302 .is_visible = switch_attr_is_visible,
2303 .attrs = switch_attrs,
2304};
2305
2306static const struct attribute_group *switch_groups[] = {
2307 &switch_group,
2308 NULL,
2309};
2310
2311static void tb_switch_release(struct device *dev)
2312{
2313 struct tb_switch *sw = tb_to_switch(dev);
2314 struct tb_port *port;
2315
2316 dma_port_free(sw->dma_port);
2317
2318 tb_switch_for_each_port(sw, port) {
2319 ida_destroy(&port->in_hopids);
2320 ida_destroy(&port->out_hopids);
2321 }
2322
2323 kfree(sw->uuid);
2324 kfree(sw->device_name);
2325 kfree(sw->vendor_name);
2326 kfree(sw->ports);
2327 kfree(sw->drom);
2328 kfree(sw->key);
2329 kfree(sw);
2330}
2331
2332static int tb_switch_uevent(const struct device *dev, struct kobj_uevent_env *env)
2333{
2334 const struct tb_switch *sw = tb_to_switch(dev);
2335 const char *type;
2336
2337 if (tb_switch_is_usb4(sw)) {
2338 if (add_uevent_var(env, "USB4_VERSION=%u.0",
2339 usb4_switch_version(sw)))
2340 return -ENOMEM;
2341 }
2342
2343 if (!tb_route(sw)) {
2344 type = "host";
2345 } else {
2346 const struct tb_port *port;
2347 bool hub = false;
2348
2349 /* Device is hub if it has any downstream ports */
2350 tb_switch_for_each_port(sw, port) {
2351 if (!port->disabled && !tb_is_upstream_port(port) &&
2352 tb_port_is_null(port)) {
2353 hub = true;
2354 break;
2355 }
2356 }
2357
2358 type = hub ? "hub" : "device";
2359 }
2360
2361 if (add_uevent_var(env, "USB4_TYPE=%s", type))
2362 return -ENOMEM;
2363 return 0;
2364}
2365
2366/*
2367 * Currently only need to provide the callbacks. Everything else is handled
2368 * in the connection manager.
2369 */
2370static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
2371{
2372 struct tb_switch *sw = tb_to_switch(dev);
2373 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
2374
2375 if (cm_ops->runtime_suspend_switch)
2376 return cm_ops->runtime_suspend_switch(sw);
2377
2378 return 0;
2379}
2380
2381static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
2382{
2383 struct tb_switch *sw = tb_to_switch(dev);
2384 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
2385
2386 if (cm_ops->runtime_resume_switch)
2387 return cm_ops->runtime_resume_switch(sw);
2388 return 0;
2389}
2390
2391static const struct dev_pm_ops tb_switch_pm_ops = {
2392 SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
2393 NULL)
2394};
2395
2396const struct device_type tb_switch_type = {
2397 .name = "thunderbolt_device",
2398 .release = tb_switch_release,
2399 .uevent = tb_switch_uevent,
2400 .pm = &tb_switch_pm_ops,
2401};
2402
2403static int tb_switch_get_generation(struct tb_switch *sw)
2404{
2405 if (tb_switch_is_usb4(sw))
2406 return 4;
2407
2408 if (sw->config.vendor_id == PCI_VENDOR_ID_INTEL) {
2409 switch (sw->config.device_id) {
2410 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
2411 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
2412 case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
2413 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
2414 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
2415 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
2416 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
2417 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
2418 return 1;
2419
2420 case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
2421 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
2422 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
2423 return 2;
2424
2425 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
2426 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
2427 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
2428 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
2429 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
2430 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
2431 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
2432 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
2433 case PCI_DEVICE_ID_INTEL_ICL_NHI0:
2434 case PCI_DEVICE_ID_INTEL_ICL_NHI1:
2435 return 3;
2436 }
2437 }
2438
2439 /*
2440 * For unknown switches assume generation to be 1 to be on the
2441 * safe side.
2442 */
2443 tb_sw_warn(sw, "unsupported switch device id %#x\n",
2444 sw->config.device_id);
2445 return 1;
2446}
2447
2448static bool tb_switch_exceeds_max_depth(const struct tb_switch *sw, int depth)
2449{
2450 int max_depth;
2451
2452 if (tb_switch_is_usb4(sw) ||
2453 (sw->tb->root_switch && tb_switch_is_usb4(sw->tb->root_switch)))
2454 max_depth = USB4_SWITCH_MAX_DEPTH;
2455 else
2456 max_depth = TB_SWITCH_MAX_DEPTH;
2457
2458 return depth > max_depth;
2459}
2460
2461/**
2462 * tb_switch_alloc() - allocate a switch
2463 * @tb: Pointer to the owning domain
2464 * @parent: Parent device for this switch
2465 * @route: Route string for this switch
2466 *
2467 * Allocates and initializes a switch. Will not upload configuration to
2468 * the switch. For that you need to call tb_switch_configure()
2469 * separately. The returned switch should be released by calling
2470 * tb_switch_put().
2471 *
2472 * Return: Pointer to &struct tb_switch or ERR_PTR() in case of failure.
2473 */
2474struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
2475 u64 route)
2476{
2477 struct tb_switch *sw;
2478 int upstream_port;
2479 int i, ret, depth;
2480
2481 /* Unlock the downstream port so we can access the switch below */
2482 if (route) {
2483 struct tb_switch *parent_sw = tb_to_switch(parent);
2484 struct tb_port *down;
2485
2486 down = tb_port_at(route, parent_sw);
2487 tb_port_unlock(down);
2488 }
2489
2490 depth = tb_route_length(route);
2491
2492 upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
2493 if (upstream_port < 0)
2494 return ERR_PTR(upstream_port);
2495
2496 sw = kzalloc_obj(*sw);
2497 if (!sw)
2498 return ERR_PTR(-ENOMEM);
2499
2500 sw->tb = tb;
2501 ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);
2502 if (ret)
2503 goto err_free_sw_ports;
2504
2505 sw->generation = tb_switch_get_generation(sw);
2506
2507 tb_dbg(tb, "current switch config:\n");
2508 tb_dump_switch(tb, sw);
2509
2510 /* configure switch */
2511 sw->config.upstream_port_number = upstream_port;
2512 sw->config.depth = depth;
2513 sw->config.route_hi = upper_32_bits(route);
2514 sw->config.route_lo = lower_32_bits(route);
2515 sw->config.enabled = 0;
2516
2517 /* Make sure we do not exceed maximum topology limit */
2518 if (tb_switch_exceeds_max_depth(sw, depth)) {
2519 ret = -EADDRNOTAVAIL;
2520 goto err_free_sw_ports;
2521 }
2522
2523 /* initialize ports */
2524 sw->ports = kzalloc_objs(*sw->ports, sw->config.max_port_number + 1);
2525 if (!sw->ports) {
2526 ret = -ENOMEM;
2527 goto err_free_sw_ports;
2528 }
2529
2530 for (i = 0; i <= sw->config.max_port_number; i++) {
2531 /* minimum setup for tb_find_cap and tb_drom_read to work */
2532 sw->ports[i].sw = sw;
2533 sw->ports[i].port = i;
2534
2535 /* Control port does not need HopID allocation */
2536 if (i) {
2537 ida_init(&sw->ports[i].in_hopids);
2538 ida_init(&sw->ports[i].out_hopids);
2539 }
2540 }
2541
2542 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
2543 if (ret > 0)
2544 sw->cap_plug_events = ret;
2545
2546 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_TIME2);
2547 if (ret > 0)
2548 sw->cap_vsec_tmu = ret;
2549
2550 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
2551 if (ret > 0)
2552 sw->cap_lc = ret;
2553
2554 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_CP_LP);
2555 if (ret > 0)
2556 sw->cap_lp = ret;
2557
2558 /* Root switch is always authorized */
2559 if (!route)
2560 sw->authorized = true;
2561
2562 device_initialize(&sw->dev);
2563 sw->dev.parent = parent;
2564 sw->dev.bus = &tb_bus_type;
2565 sw->dev.type = &tb_switch_type;
2566 sw->dev.groups = switch_groups;
2567 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
2568
2569 return sw;
2570
2571err_free_sw_ports:
2572 kfree(sw->ports);
2573 kfree(sw);
2574
2575 return ERR_PTR(ret);
2576}
2577
2578/**
2579 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
2580 * @tb: Pointer to the owning domain
2581 * @parent: Parent device for this switch
2582 * @route: Route string for this switch
2583 *
2584 * This creates a switch in safe mode. This means the switch pretty much
2585 * lacks all capabilities except DMA configuration port before it is
2586 * flashed with a valid NVM firmware.
2587 *
2588 * The returned switch must be released by calling tb_switch_put().
2589 *
2590 * Return: Pointer to &struct tb_switch or ERR_PTR() in case of failure.
2591 */
2592struct tb_switch *
2593tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
2594{
2595 struct tb_switch *sw;
2596
2597 sw = kzalloc_obj(*sw);
2598 if (!sw)
2599 return ERR_PTR(-ENOMEM);
2600
2601 sw->tb = tb;
2602 sw->config.depth = tb_route_length(route);
2603 sw->config.route_hi = upper_32_bits(route);
2604 sw->config.route_lo = lower_32_bits(route);
2605 sw->safe_mode = true;
2606
2607 device_initialize(&sw->dev);
2608 sw->dev.parent = parent;
2609 sw->dev.bus = &tb_bus_type;
2610 sw->dev.type = &tb_switch_type;
2611 sw->dev.groups = switch_groups;
2612 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
2613
2614 return sw;
2615}
2616
2617/**
2618 * tb_switch_configure() - Uploads configuration to the switch
2619 * @sw: Switch to configure
2620 *
2621 * Call this function before the switch is added to the system. It will
2622 * upload configuration to the switch and makes it available for the
2623 * connection manager to use. Can be called to the switch again after
2624 * resume from low power states to re-initialize it.
2625 *
2626 * Return: %0 on success, negative errno otherwise.
2627 */
2628int tb_switch_configure(struct tb_switch *sw)
2629{
2630 struct tb *tb = sw->tb;
2631 u64 route;
2632 int ret;
2633
2634 route = tb_route(sw);
2635
2636 tb_dbg(tb, "%s Switch at %#llx (depth: %d, up port: %d)\n",
2637 sw->config.enabled ? "restoring" : "initializing", route,
2638 tb_route_length(route), sw->config.upstream_port_number);
2639
2640 sw->config.enabled = 1;
2641
2642 if (tb_switch_is_usb4(sw)) {
2643 /*
2644 * For USB4 devices, we need to program the CM version
2645 * accordingly so that it knows to expose all the
2646 * additional capabilities. Program it according to USB4
2647 * version to avoid changing existing (v1) routers behaviour.
2648 */
2649 if (usb4_switch_version(sw) < 2)
2650 sw->config.cmuv = ROUTER_CS_4_CMUV_V1;
2651 else
2652 sw->config.cmuv = ROUTER_CS_4_CMUV_V2;
2653 sw->config.plug_events_delay = 0xa;
2654
2655 /* Enumerate the switch */
2656 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2657 ROUTER_CS_1, 4);
2658 if (ret)
2659 return ret;
2660
2661 ret = usb4_switch_setup(sw);
2662 } else {
2663 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
2664 tb_sw_warn(sw, "unknown switch vendor id %#x\n",
2665 sw->config.vendor_id);
2666
2667 if (!sw->cap_plug_events) {
2668 tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
2669 return -ENODEV;
2670 }
2671
2672 /* Enumerate the switch */
2673 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2674 ROUTER_CS_1, 3);
2675 }
2676 if (ret)
2677 return ret;
2678
2679 return tb_plug_events_active(sw, true);
2680}
2681
2682/**
2683 * tb_switch_configuration_valid() - Set the tunneling configuration to be valid
2684 * @sw: Router to configure
2685 *
2686 * Needs to be called before any tunnels can be setup through the
2687 * router. Can be called to any router.
2688 *
2689 * Return: %0 on success, negative errno otherwise.
2690 */
2691int tb_switch_configuration_valid(struct tb_switch *sw)
2692{
2693 if (tb_switch_is_usb4(sw))
2694 return usb4_switch_configuration_valid(sw);
2695 return 0;
2696}
2697
2698static int tb_switch_set_uuid(struct tb_switch *sw)
2699{
2700 bool uid = false;
2701 u32 uuid[4];
2702 int ret;
2703
2704 if (sw->uuid)
2705 return 0;
2706
2707 if (tb_switch_is_usb4(sw)) {
2708 ret = usb4_switch_read_uid(sw, &sw->uid);
2709 if (ret)
2710 return ret;
2711 uid = true;
2712 } else {
2713 /*
2714 * The newer controllers include fused UUID as part of
2715 * link controller specific registers
2716 */
2717 ret = tb_lc_read_uuid(sw, uuid);
2718 if (ret) {
2719 if (ret != -EINVAL)
2720 return ret;
2721 uid = true;
2722 }
2723 }
2724
2725 if (uid) {
2726 /*
2727 * ICM generates UUID based on UID and fills the upper
2728 * two words with ones. This is not strictly following
2729 * UUID format but we want to be compatible with it so
2730 * we do the same here.
2731 */
2732 uuid[0] = sw->uid & 0xffffffff;
2733 uuid[1] = (sw->uid >> 32) & 0xffffffff;
2734 uuid[2] = 0xffffffff;
2735 uuid[3] = 0xffffffff;
2736 }
2737
2738 sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
2739 if (!sw->uuid)
2740 return -ENOMEM;
2741 return 0;
2742}
2743
2744static int tb_switch_add_dma_port(struct tb_switch *sw)
2745{
2746 u32 status;
2747 int ret;
2748
2749 switch (sw->generation) {
2750 case 2:
2751 /* Only root switch can be upgraded */
2752 if (tb_route(sw))
2753 return 0;
2754
2755 fallthrough;
2756 case 3:
2757 case 4:
2758 ret = tb_switch_set_uuid(sw);
2759 if (ret)
2760 return ret;
2761 break;
2762
2763 default:
2764 /*
2765 * DMA port is the only thing available when the switch
2766 * is in safe mode.
2767 */
2768 if (!sw->safe_mode)
2769 return 0;
2770 break;
2771 }
2772
2773 if (sw->no_nvm_upgrade)
2774 return 0;
2775
2776 if (tb_switch_is_usb4(sw)) {
2777 ret = usb4_switch_nvm_authenticate_status(sw, &status);
2778 if (ret)
2779 return ret;
2780
2781 if (status) {
2782 tb_sw_info(sw, "switch flash authentication failed\n");
2783 nvm_set_auth_status(sw, status);
2784 }
2785
2786 return 0;
2787 }
2788
2789 /* Root switch DMA port requires running firmware */
2790 if (!tb_route(sw) && !tb_switch_is_icm(sw))
2791 return 0;
2792
2793 sw->dma_port = dma_port_alloc(sw);
2794 if (!sw->dma_port)
2795 return 0;
2796
2797 /*
2798 * If there is status already set then authentication failed
2799 * when the dma_port_flash_update_auth() returned. Power cycling
2800 * is not needed (it was done already) so only thing we do here
2801 * is to unblock runtime PM of the root port.
2802 */
2803 nvm_get_auth_status(sw, &status);
2804 if (status) {
2805 if (!tb_route(sw))
2806 nvm_authenticate_complete_dma_port(sw);
2807 return 0;
2808 }
2809
2810 /*
2811 * Check status of the previous flash authentication. If there
2812 * is one we need to power cycle the switch in any case to make
2813 * it functional again.
2814 */
2815 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
2816 if (ret <= 0)
2817 return ret;
2818
2819 /* Now we can allow root port to suspend again */
2820 if (!tb_route(sw))
2821 nvm_authenticate_complete_dma_port(sw);
2822
2823 if (status) {
2824 tb_sw_info(sw, "switch flash authentication failed\n");
2825 nvm_set_auth_status(sw, status);
2826 }
2827
2828 tb_sw_info(sw, "power cycling the switch now\n");
2829 dma_port_power_cycle(sw->dma_port);
2830
2831 /*
2832 * We return error here which causes the switch adding failure.
2833 * It should appear back after power cycle is complete.
2834 */
2835 return -ESHUTDOWN;
2836}
2837
2838static void tb_switch_default_link_ports(struct tb_switch *sw)
2839{
2840 int i;
2841
2842 for (i = 1; i <= sw->config.max_port_number; i++) {
2843 struct tb_port *port = &sw->ports[i];
2844 struct tb_port *subordinate;
2845
2846 if (!tb_port_is_null(port))
2847 continue;
2848
2849 /* Check for the subordinate port */
2850 if (i == sw->config.max_port_number ||
2851 !tb_port_is_null(&sw->ports[i + 1]))
2852 continue;
2853
2854 /* Link them if not already done so (by DROM) */
2855 subordinate = &sw->ports[i + 1];
2856 if (!port->dual_link_port && !subordinate->dual_link_port) {
2857 port->link_nr = 0;
2858 port->dual_link_port = subordinate;
2859 subordinate->link_nr = 1;
2860 subordinate->dual_link_port = port;
2861
2862 tb_sw_dbg(sw, "linked ports %d <-> %d\n",
2863 port->port, subordinate->port);
2864 }
2865 }
2866}
2867
2868static bool tb_switch_lane_bonding_possible(struct tb_switch *sw)
2869{
2870 const struct tb_port *up = tb_upstream_port(sw);
2871
2872 if (!up->dual_link_port || !up->dual_link_port->remote)
2873 return false;
2874
2875 if (tb_switch_is_usb4(sw))
2876 return usb4_switch_lane_bonding_possible(sw);
2877 return tb_lc_lane_bonding_possible(sw);
2878}
2879
2880static int tb_switch_update_link_attributes(struct tb_switch *sw)
2881{
2882 struct tb_port *up;
2883 bool change = false;
2884 int ret;
2885
2886 if (!tb_route(sw) || tb_switch_is_icm(sw))
2887 return 0;
2888
2889 up = tb_upstream_port(sw);
2890
2891 ret = tb_port_get_link_speed(up);
2892 if (ret < 0)
2893 return ret;
2894 if (sw->link_speed != ret)
2895 change = true;
2896 sw->link_speed = ret;
2897
2898 ret = tb_port_get_link_width(up);
2899 if (ret < 0)
2900 return ret;
2901 if (sw->link_width != ret)
2902 change = true;
2903 sw->link_width = ret;
2904
2905 /* Notify userspace that there is possible link attribute change */
2906 if (device_is_registered(&sw->dev) && change)
2907 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
2908
2909 return 0;
2910}
2911
2912/* Must be called after tb_switch_update_link_attributes() */
2913static void tb_switch_link_init(struct tb_switch *sw)
2914{
2915 struct tb_port *up, *down;
2916 bool bonded;
2917
2918 if (!tb_route(sw) || tb_switch_is_icm(sw))
2919 return;
2920
2921 tb_sw_dbg(sw, "current link speed %u.0 Gb/s\n", sw->link_speed);
2922 tb_sw_dbg(sw, "current link width %s\n", tb_width_name(sw->link_width));
2923
2924 bonded = sw->link_width >= TB_LINK_WIDTH_DUAL;
2925
2926 /*
2927 * Gen 4 links come up as bonded so update the port structures
2928 * accordingly.
2929 */
2930 up = tb_upstream_port(sw);
2931 down = tb_switch_downstream_port(sw);
2932
2933 up->bonded = bonded;
2934 if (up->dual_link_port)
2935 up->dual_link_port->bonded = bonded;
2936 tb_port_update_credits(up);
2937
2938 down->bonded = bonded;
2939 if (down->dual_link_port)
2940 down->dual_link_port->bonded = bonded;
2941 tb_port_update_credits(down);
2942
2943 if (tb_port_get_link_generation(up) < 4)
2944 return;
2945
2946 /*
2947 * Set the Gen 4 preferred link width. This is what the router
2948 * prefers when the link is brought up. If the router does not
2949 * support asymmetric link configuration, this also will be set
2950 * to TB_LINK_WIDTH_DUAL.
2951 */
2952 sw->preferred_link_width = sw->link_width;
2953 tb_sw_dbg(sw, "preferred link width %s\n",
2954 tb_width_name(sw->preferred_link_width));
2955}
2956
2957/**
2958 * tb_switch_lane_bonding_enable() - Enable lane bonding
2959 * @sw: Switch to enable lane bonding
2960 *
2961 * Connection manager can call this function to enable lane bonding of a
2962 * switch. If conditions are correct and both switches support the feature,
2963 * lanes are bonded. It is safe to call this to any switch.
2964 *
2965 * Return: %0 on success, negative errno otherwise.
2966 */
2967static int tb_switch_lane_bonding_enable(struct tb_switch *sw)
2968{
2969 struct tb_port *up, *down;
2970 unsigned int width;
2971 int ret;
2972
2973 if (!tb_switch_lane_bonding_possible(sw))
2974 return 0;
2975
2976 up = tb_upstream_port(sw);
2977 down = tb_switch_downstream_port(sw);
2978
2979 if (!tb_port_width_supported(up, TB_LINK_WIDTH_DUAL) ||
2980 !tb_port_width_supported(down, TB_LINK_WIDTH_DUAL))
2981 return 0;
2982
2983 /*
2984 * Both lanes need to be in CL0. Here we assume lane 0 already be in
2985 * CL0 and check just for lane 1.
2986 */
2987 if (tb_wait_for_port(down->dual_link_port, false) <= 0)
2988 return -ENOTCONN;
2989
2990 ret = tb_port_lane_bonding_enable(up);
2991 if (ret) {
2992 tb_port_warn(up, "failed to enable lane bonding\n");
2993 return ret;
2994 }
2995
2996 ret = tb_port_lane_bonding_enable(down);
2997 if (ret) {
2998 tb_port_warn(down, "failed to enable lane bonding\n");
2999 tb_port_lane_bonding_disable(up);
3000 return ret;
3001 }
3002
3003 /* Any of the widths are all bonded */
3004 width = TB_LINK_WIDTH_DUAL | TB_LINK_WIDTH_ASYM_TX |
3005 TB_LINK_WIDTH_ASYM_RX;
3006
3007 return tb_port_wait_for_link_width(down, width, 100);
3008}
3009
3010/**
3011 * tb_switch_lane_bonding_disable() - Disable lane bonding
3012 * @sw: Switch whose lane bonding to disable
3013 *
3014 * Disables lane bonding between @sw and parent. This can be called even
3015 * if lanes were not bonded originally.
3016 *
3017 * Return: %0 on success, negative errno otherwise.
3018 */
3019static int tb_switch_lane_bonding_disable(struct tb_switch *sw)
3020{
3021 struct tb_port *up, *down;
3022 int ret;
3023
3024 up = tb_upstream_port(sw);
3025 if (!up->bonded)
3026 return 0;
3027
3028 /*
3029 * If the link is Gen 4 there is no way to switch the link to
3030 * two single lane links so avoid that here. Also don't bother
3031 * if the link is not up anymore (sw is unplugged).
3032 */
3033 ret = tb_port_get_link_generation(up);
3034 if (ret < 0)
3035 return ret;
3036 if (ret >= 4)
3037 return -EOPNOTSUPP;
3038
3039 down = tb_switch_downstream_port(sw);
3040 tb_port_lane_bonding_disable(up);
3041 tb_port_lane_bonding_disable(down);
3042
3043 /*
3044 * It is fine if we get other errors as the router might have
3045 * been unplugged.
3046 */
3047 return tb_port_wait_for_link_width(down, TB_LINK_WIDTH_SINGLE, 100);
3048}
3049
3050/* Note updating sw->link_width done in tb_switch_update_link_attributes() */
3051static int tb_switch_asym_enable(struct tb_switch *sw, enum tb_link_width width)
3052{
3053 struct tb_port *up, *down, *port;
3054 enum tb_link_width down_width;
3055 int ret;
3056
3057 up = tb_upstream_port(sw);
3058 down = tb_switch_downstream_port(sw);
3059
3060 if (width == TB_LINK_WIDTH_ASYM_TX) {
3061 down_width = TB_LINK_WIDTH_ASYM_RX;
3062 port = down;
3063 } else {
3064 down_width = TB_LINK_WIDTH_ASYM_TX;
3065 port = up;
3066 }
3067
3068 ret = tb_port_set_link_width(up, width);
3069 if (ret)
3070 return ret;
3071
3072 ret = tb_port_set_link_width(down, down_width);
3073 if (ret)
3074 return ret;
3075
3076 /*
3077 * Initiate the change in the router that one of its TX lanes is
3078 * changing to RX but do so only if there is an actual change.
3079 */
3080 if (sw->link_width != width) {
3081 ret = usb4_port_asym_start(port);
3082 if (ret)
3083 return ret;
3084
3085 ret = tb_port_wait_for_link_width(up, width, 100);
3086 if (ret)
3087 return ret;
3088 }
3089
3090 return 0;
3091}
3092
3093/* Note updating sw->link_width done in tb_switch_update_link_attributes() */
3094static int tb_switch_asym_disable(struct tb_switch *sw)
3095{
3096 struct tb_port *up, *down;
3097 int ret;
3098
3099 up = tb_upstream_port(sw);
3100 down = tb_switch_downstream_port(sw);
3101
3102 ret = tb_port_set_link_width(up, TB_LINK_WIDTH_DUAL);
3103 if (ret)
3104 return ret;
3105
3106 ret = tb_port_set_link_width(down, TB_LINK_WIDTH_DUAL);
3107 if (ret)
3108 return ret;
3109
3110 /*
3111 * Initiate the change in the router that has three TX lanes and
3112 * is changing one of its TX lanes to RX but only if there is a
3113 * change in the link width.
3114 */
3115 if (sw->link_width > TB_LINK_WIDTH_DUAL) {
3116 if (sw->link_width == TB_LINK_WIDTH_ASYM_TX)
3117 ret = usb4_port_asym_start(up);
3118 else
3119 ret = usb4_port_asym_start(down);
3120 if (ret)
3121 return ret;
3122
3123 ret = tb_port_wait_for_link_width(up, TB_LINK_WIDTH_DUAL, 100);
3124 if (ret)
3125 return ret;
3126 }
3127
3128 return 0;
3129}
3130
3131/**
3132 * tb_switch_set_link_width() - Configure router link width
3133 * @sw: Router to configure
3134 * @width: The new link width
3135 *
3136 * Set device router link width to @width from router upstream port
3137 * perspective. Supports also asymmetric links if the routers both side
3138 * of the link supports it.
3139 *
3140 * Does nothing for host router.
3141 *
3142 * Return: %0 on success, negative errno otherwise.
3143 */
3144int tb_switch_set_link_width(struct tb_switch *sw, enum tb_link_width width)
3145{
3146 struct tb_port *up, *down;
3147 int ret = 0;
3148
3149 if (!tb_route(sw))
3150 return 0;
3151
3152 up = tb_upstream_port(sw);
3153 down = tb_switch_downstream_port(sw);
3154
3155 switch (width) {
3156 case TB_LINK_WIDTH_SINGLE:
3157 ret = tb_switch_lane_bonding_disable(sw);
3158 break;
3159
3160 case TB_LINK_WIDTH_DUAL:
3161 if (sw->link_width == TB_LINK_WIDTH_ASYM_TX ||
3162 sw->link_width == TB_LINK_WIDTH_ASYM_RX) {
3163 ret = tb_switch_asym_disable(sw);
3164 if (ret)
3165 break;
3166 }
3167 ret = tb_switch_lane_bonding_enable(sw);
3168 break;
3169
3170 case TB_LINK_WIDTH_ASYM_TX:
3171 case TB_LINK_WIDTH_ASYM_RX:
3172 ret = tb_switch_asym_enable(sw, width);
3173 break;
3174 }
3175
3176 switch (ret) {
3177 case 0:
3178 break;
3179
3180 case -ETIMEDOUT:
3181 tb_sw_warn(sw, "timeout changing link width\n");
3182 return ret;
3183
3184 case -ENOTCONN:
3185 case -EOPNOTSUPP:
3186 case -ENODEV:
3187 return ret;
3188
3189 default:
3190 tb_sw_dbg(sw, "failed to change link width: %d\n", ret);
3191 return ret;
3192 }
3193
3194 tb_port_update_credits(down);
3195 tb_port_update_credits(up);
3196
3197 tb_switch_update_link_attributes(sw);
3198
3199 tb_sw_dbg(sw, "link width set to %s\n", tb_width_name(width));
3200 return ret;
3201}
3202
3203/**
3204 * tb_switch_configure_link() - Set link configured
3205 * @sw: Switch whose link is configured
3206 *
3207 * Sets the link upstream from @sw configured (from both ends) so that
3208 * it will not be disconnected when the domain exits sleep. Can be
3209 * called for any switch.
3210 *
3211 * It is recommended that this is called after lane bonding is enabled.
3212 *
3213 * Return: %0 on success and negative errno otherwise.
3214 */
3215int tb_switch_configure_link(struct tb_switch *sw)
3216{
3217 struct tb_port *up, *down;
3218 int ret;
3219
3220 if (!tb_route(sw) || tb_switch_is_icm(sw))
3221 return 0;
3222
3223 up = tb_upstream_port(sw);
3224 if (tb_switch_is_usb4(up->sw))
3225 ret = usb4_port_configure(up);
3226 else
3227 ret = tb_lc_configure_port(up);
3228 if (ret)
3229 return ret;
3230
3231 down = up->remote;
3232 if (tb_switch_is_usb4(down->sw))
3233 return usb4_port_configure(down);
3234 return tb_lc_configure_port(down);
3235}
3236
3237/**
3238 * tb_switch_unconfigure_link() - Unconfigure link
3239 * @sw: Switch whose link is unconfigured
3240 *
3241 * Sets the link unconfigured so the @sw will be disconnected if the
3242 * domain exits sleep.
3243 */
3244void tb_switch_unconfigure_link(struct tb_switch *sw)
3245{
3246 struct tb_port *up, *down;
3247
3248 if (!tb_route(sw) || tb_switch_is_icm(sw))
3249 return;
3250
3251 /*
3252 * Unconfigure downstream port so that wake-on-connect can be
3253 * configured after router unplug. No need to unconfigure upstream port
3254 * since its router is unplugged.
3255 */
3256 up = tb_upstream_port(sw);
3257 down = up->remote;
3258 if (tb_switch_is_usb4(down->sw))
3259 usb4_port_unconfigure(down);
3260 else
3261 tb_lc_unconfigure_port(down);
3262
3263 if (sw->is_unplugged)
3264 return;
3265
3266 up = tb_upstream_port(sw);
3267 if (tb_switch_is_usb4(up->sw))
3268 usb4_port_unconfigure(up);
3269 else
3270 tb_lc_unconfigure_port(up);
3271}
3272
3273static void tb_switch_credits_init(struct tb_switch *sw)
3274{
3275 if (tb_switch_is_icm(sw))
3276 return;
3277 if (!tb_switch_is_usb4(sw))
3278 return;
3279 if (usb4_switch_credits_init(sw))
3280 tb_sw_info(sw, "failed to determine preferred buffer allocation, using defaults\n");
3281}
3282
3283static int tb_switch_port_hotplug_enable(struct tb_switch *sw)
3284{
3285 struct tb_port *port;
3286
3287 if (tb_switch_is_icm(sw))
3288 return 0;
3289
3290 tb_switch_for_each_port(sw, port) {
3291 int res;
3292
3293 if (!port->cap_usb4)
3294 continue;
3295
3296 res = usb4_port_hotplug_enable(port);
3297 if (res)
3298 return res;
3299 }
3300 return 0;
3301}
3302
3303/**
3304 * tb_switch_add() - Add a switch to the domain
3305 * @sw: Switch to add
3306 *
3307 * This is the last step in adding switch to the domain. It will read
3308 * identification information from DROM and initializes ports so that
3309 * they can be used to connect other switches. The switch will be
3310 * exposed to the userspace when this function successfully returns. To
3311 * remove and release the switch, call tb_switch_remove().
3312 *
3313 * Return: %0 on success, negative errno otherwise.
3314 */
3315int tb_switch_add(struct tb_switch *sw)
3316{
3317 int i, ret;
3318
3319 /*
3320 * Initialize DMA control port now before we read DROM. Recent
3321 * host controllers have more complete DROM on NVM that includes
3322 * vendor and model identification strings which we then expose
3323 * to the userspace. NVM can be accessed through DMA
3324 * configuration based mailbox.
3325 */
3326 ret = tb_switch_add_dma_port(sw);
3327 if (ret) {
3328 dev_err(&sw->dev, "failed to add DMA port\n");
3329 return ret;
3330 }
3331
3332 ret = tb_switch_nvm_init(sw);
3333 if (ret)
3334 return ret;
3335
3336 if (!sw->safe_mode) {
3337 tb_switch_credits_init(sw);
3338
3339 /* read drom */
3340 ret = tb_drom_read(sw);
3341 if (ret)
3342 dev_warn(&sw->dev, "reading DROM failed: %d\n", ret);
3343 tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
3344
3345 ret = tb_switch_set_uuid(sw);
3346 if (ret) {
3347 dev_err(&sw->dev, "failed to set UUID\n");
3348 return ret;
3349 }
3350
3351 for (i = 0; i <= sw->config.max_port_number; i++) {
3352 if (sw->ports[i].disabled) {
3353 tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
3354 continue;
3355 }
3356 ret = tb_init_port(&sw->ports[i]);
3357 if (ret) {
3358 dev_err(&sw->dev, "failed to initialize port %d\n", i);
3359 return ret;
3360 }
3361 }
3362
3363 tb_check_quirks(sw);
3364
3365 tb_switch_default_link_ports(sw);
3366
3367 ret = tb_switch_update_link_attributes(sw);
3368 if (ret)
3369 return ret;
3370
3371 tb_switch_link_init(sw);
3372
3373 ret = tb_switch_clx_init(sw);
3374 if (ret)
3375 return ret;
3376
3377 ret = tb_switch_tmu_init(sw);
3378 if (ret)
3379 return ret;
3380 }
3381
3382 ret = tb_switch_port_hotplug_enable(sw);
3383 if (ret)
3384 return ret;
3385
3386 ret = device_add(&sw->dev);
3387 if (ret) {
3388 dev_err(&sw->dev, "failed to add device: %d\n", ret);
3389 return ret;
3390 }
3391
3392 if (tb_route(sw)) {
3393 dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
3394 sw->vendor, sw->device);
3395 if (sw->vendor_name && sw->device_name)
3396 dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
3397 sw->device_name);
3398 }
3399
3400 ret = usb4_switch_add_ports(sw);
3401 if (ret) {
3402 dev_err(&sw->dev, "failed to add USB4 ports\n");
3403 goto err_del;
3404 }
3405
3406 ret = tb_switch_nvm_add(sw);
3407 if (ret) {
3408 dev_err(&sw->dev, "failed to add NVM devices\n");
3409 goto err_ports;
3410 }
3411
3412 /*
3413 * Thunderbolt routers do not generate wakeups themselves but
3414 * they forward wakeups from tunneled protocols, so enable it
3415 * here.
3416 */
3417 device_init_wakeup(&sw->dev, true);
3418
3419 pm_runtime_set_active(&sw->dev);
3420 if (sw->rpm) {
3421 pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
3422 pm_runtime_use_autosuspend(&sw->dev);
3423 pm_runtime_mark_last_busy(&sw->dev);
3424 pm_runtime_enable(&sw->dev);
3425 pm_request_autosuspend(&sw->dev);
3426 }
3427
3428 tb_switch_debugfs_init(sw);
3429 return 0;
3430
3431err_ports:
3432 usb4_switch_remove_ports(sw);
3433err_del:
3434 device_del(&sw->dev);
3435
3436 return ret;
3437}
3438
3439/**
3440 * tb_switch_remove() - Remove and release a switch
3441 * @sw: Switch to remove
3442 *
3443 * This will remove the switch from the domain and release it after last
3444 * reference count drops to zero. If there are switches connected below
3445 * this switch, they will be removed as well.
3446 */
3447void tb_switch_remove(struct tb_switch *sw)
3448{
3449 struct tb_port *port;
3450
3451 tb_switch_debugfs_remove(sw);
3452
3453 if (sw->rpm) {
3454 pm_runtime_get_sync(&sw->dev);
3455 pm_runtime_disable(&sw->dev);
3456 }
3457
3458 /* port 0 is the switch itself and never has a remote */
3459 tb_switch_for_each_port(sw, port) {
3460 if (tb_port_has_remote(port)) {
3461 tb_switch_remove(port->remote->sw);
3462 port->remote = NULL;
3463 } else if (port->xdomain) {
3464 port->xdomain->is_unplugged = true;
3465 tb_xdomain_remove(port->xdomain);
3466 port->xdomain = NULL;
3467 }
3468
3469 /* Remove any downstream retimers */
3470 tb_retimer_remove_all(port);
3471 }
3472
3473 if (!sw->is_unplugged)
3474 tb_plug_events_active(sw, false);
3475
3476 tb_switch_nvm_remove(sw);
3477 usb4_switch_remove_ports(sw);
3478
3479 if (tb_route(sw))
3480 dev_info(&sw->dev, "device disconnected\n");
3481 device_unregister(&sw->dev);
3482}
3483
3484/**
3485 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
3486 * @sw: Router to mark unplugged
3487 */
3488void tb_sw_set_unplugged(struct tb_switch *sw)
3489{
3490 struct tb_port *port;
3491
3492 if (sw == sw->tb->root_switch) {
3493 tb_sw_WARN(sw, "cannot unplug root switch\n");
3494 return;
3495 }
3496 if (sw->is_unplugged) {
3497 tb_sw_WARN(sw, "is_unplugged already set\n");
3498 return;
3499 }
3500 sw->is_unplugged = true;
3501 tb_switch_for_each_port(sw, port) {
3502 if (tb_port_has_remote(port))
3503 tb_sw_set_unplugged(port->remote->sw);
3504 else if (port->xdomain)
3505 port->xdomain->is_unplugged = true;
3506 }
3507}
3508
3509static int tb_switch_set_wake(struct tb_switch *sw, unsigned int flags, bool runtime)
3510{
3511 if (flags)
3512 tb_sw_dbg(sw, "enabling wakeup: %#x\n", flags);
3513 else
3514 tb_sw_dbg(sw, "disabling wakeup\n");
3515
3516 if (tb_switch_is_usb4(sw))
3517 return usb4_switch_set_wake(sw, flags, runtime);
3518 return tb_lc_set_wake(sw, flags);
3519}
3520
3521static void tb_switch_check_wakes(struct tb_switch *sw)
3522{
3523 if (device_may_wakeup(&sw->dev)) {
3524 if (tb_switch_is_usb4(sw))
3525 usb4_switch_check_wakes(sw);
3526 }
3527}
3528
3529/**
3530 * tb_switch_resume() - Resume a switch after sleep
3531 * @sw: Switch to resume
3532 * @runtime: Is this resume from runtime suspend or system sleep
3533 *
3534 * Resumes and re-enumerates router (and all its children), if still plugged
3535 * after suspend. Don't enumerate device router whose UID was changed during
3536 * suspend. If this is resume from system sleep, notifies PM core about the
3537 * wakes occurred during suspend. Disables all wakes, except USB4 wake of
3538 * upstream port for USB4 routers that shall be always enabled.
3539 *
3540 * Return: %0 on success, negative errno otherwise.
3541 */
3542int tb_switch_resume(struct tb_switch *sw, bool runtime)
3543{
3544 struct tb_port *port;
3545 int err;
3546
3547 tb_sw_dbg(sw, "resuming switch\n");
3548
3549 /*
3550 * Check for UID of the connected switches except for root
3551 * switch which we assume cannot be removed.
3552 */
3553 if (tb_route(sw)) {
3554 u64 uid;
3555
3556 /*
3557 * Check first that we can still read the switch config
3558 * space. It may be that there is now another domain
3559 * connected.
3560 */
3561 err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
3562 if (err < 0) {
3563 tb_sw_info(sw, "switch not present anymore\n");
3564 return err;
3565 }
3566
3567 /* We don't have any way to confirm this was the same device */
3568 if (!sw->uid)
3569 return -ENODEV;
3570
3571 if (tb_switch_is_usb4(sw))
3572 err = usb4_switch_read_uid(sw, &uid);
3573 else
3574 err = tb_drom_read_uid_only(sw, &uid);
3575 if (err) {
3576 tb_sw_warn(sw, "uid read failed\n");
3577 return err;
3578 }
3579 if (sw->uid != uid) {
3580 tb_sw_info(sw,
3581 "changed while suspended (uid %#llx -> %#llx)\n",
3582 sw->uid, uid);
3583 return -ENODEV;
3584 }
3585 }
3586
3587 err = tb_switch_configure(sw);
3588 if (err)
3589 return err;
3590
3591 if (!runtime)
3592 tb_switch_check_wakes(sw);
3593
3594 /* Disable wakes */
3595 tb_switch_set_wake(sw, 0, true);
3596
3597 err = tb_switch_tmu_init(sw);
3598 if (err)
3599 return err;
3600
3601 /* check for surviving downstream switches */
3602 tb_switch_for_each_port(sw, port) {
3603 if (!tb_port_is_null(port))
3604 continue;
3605
3606 if (!tb_port_resume(port))
3607 continue;
3608
3609 if (tb_wait_for_port(port, true) <= 0) {
3610 tb_port_warn(port,
3611 "lost during suspend, disconnecting\n");
3612 if (tb_port_has_remote(port))
3613 tb_sw_set_unplugged(port->remote->sw);
3614 else if (port->xdomain)
3615 port->xdomain->is_unplugged = true;
3616 } else {
3617 /*
3618 * Always unlock the port so the downstream
3619 * switch/domain is accessible.
3620 */
3621 if (tb_port_unlock(port))
3622 tb_port_warn(port, "failed to unlock port\n");
3623 if (port->remote &&
3624 tb_switch_resume(port->remote->sw, runtime)) {
3625 tb_port_warn(port,
3626 "lost during suspend, disconnecting\n");
3627 tb_sw_set_unplugged(port->remote->sw);
3628 }
3629 }
3630 }
3631 return 0;
3632}
3633
3634/**
3635 * tb_switch_suspend() - Put a switch to sleep
3636 * @sw: Switch to suspend
3637 * @runtime: Is this runtime suspend or system sleep
3638 *
3639 * Suspends router and all its children. Enables wakes according to
3640 * value of @runtime and then sets sleep bit for the router. If @sw is
3641 * host router the domain is ready to go to sleep once this function
3642 * returns.
3643 */
3644void tb_switch_suspend(struct tb_switch *sw, bool runtime)
3645{
3646 unsigned int flags = 0;
3647 struct tb_port *port;
3648 int err;
3649
3650 tb_sw_dbg(sw, "suspending switch\n");
3651
3652 /*
3653 * Actually only needed for Titan Ridge but for simplicity can be
3654 * done for USB4 device too as CLx is re-enabled at resume.
3655 */
3656 tb_switch_clx_disable(sw);
3657
3658 err = tb_plug_events_active(sw, false);
3659 if (err)
3660 return;
3661
3662 tb_switch_for_each_port(sw, port) {
3663 if (tb_port_has_remote(port))
3664 tb_switch_suspend(port->remote->sw, runtime);
3665 }
3666
3667 if (runtime) {
3668 /* Trigger wake when something is plugged in/out */
3669 flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT;
3670 flags |= TB_WAKE_ON_USB4;
3671 flags |= TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE | TB_WAKE_ON_DP;
3672 } else if (device_may_wakeup(&sw->dev)) {
3673 flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT;
3674 flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;
3675 }
3676
3677 tb_switch_set_wake(sw, flags, runtime);
3678
3679 if (tb_switch_is_usb4(sw))
3680 usb4_switch_set_sleep(sw);
3681 else
3682 tb_lc_set_sleep(sw);
3683}
3684
3685/**
3686 * tb_switch_query_dp_resource() - Query availability of DP resource
3687 * @sw: Switch whose DP resource is queried
3688 * @in: DP IN port
3689 *
3690 * Queries availability of DP resource for DP tunneling using switch
3691 * specific means.
3692 *
3693 * Return: %true if resource is available, %false otherwise.
3694 */
3695bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in)
3696{
3697 if (tb_switch_is_usb4(sw))
3698 return usb4_switch_query_dp_resource(sw, in);
3699 return tb_lc_dp_sink_query(sw, in);
3700}
3701
3702/**
3703 * tb_switch_alloc_dp_resource() - Allocate available DP resource
3704 * @sw: Switch whose DP resource is allocated
3705 * @in: DP IN port
3706 *
3707 * Allocates DP resource for DP tunneling. The resource must be
3708 * available for this to succeed (see tb_switch_query_dp_resource()).
3709 *
3710 * Return: %0 on success, negative errno otherwise.
3711 */
3712int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
3713{
3714 int ret;
3715
3716 if (tb_switch_is_usb4(sw))
3717 ret = usb4_switch_alloc_dp_resource(sw, in);
3718 else
3719 ret = tb_lc_dp_sink_alloc(sw, in);
3720
3721 if (ret)
3722 tb_sw_warn(sw, "failed to allocate DP resource for port %d\n",
3723 in->port);
3724 else
3725 tb_sw_dbg(sw, "allocated DP resource for port %d\n", in->port);
3726
3727 return ret;
3728}
3729
3730/**
3731 * tb_switch_dealloc_dp_resource() - De-allocate DP resource
3732 * @sw: Switch whose DP resource is de-allocated
3733 * @in: DP IN port
3734 *
3735 * De-allocates DP resource that was previously allocated for DP
3736 * tunneling.
3737 */
3738void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
3739{
3740 int ret;
3741
3742 if (tb_switch_is_usb4(sw))
3743 ret = usb4_switch_dealloc_dp_resource(sw, in);
3744 else
3745 ret = tb_lc_dp_sink_dealloc(sw, in);
3746
3747 if (ret)
3748 tb_sw_warn(sw, "failed to de-allocate DP resource for port %d\n",
3749 in->port);
3750 else
3751 tb_sw_dbg(sw, "released DP resource for port %d\n", in->port);
3752}
3753
3754struct tb_sw_lookup {
3755 struct tb *tb;
3756 u8 link;
3757 u8 depth;
3758 const uuid_t *uuid;
3759 u64 route;
3760};
3761
3762static int tb_switch_match(struct device *dev, const void *data)
3763{
3764 struct tb_switch *sw = tb_to_switch(dev);
3765 const struct tb_sw_lookup *lookup = data;
3766
3767 if (!sw)
3768 return 0;
3769 if (sw->tb != lookup->tb)
3770 return 0;
3771
3772 if (lookup->uuid)
3773 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
3774
3775 if (lookup->route) {
3776 return sw->config.route_lo == lower_32_bits(lookup->route) &&
3777 sw->config.route_hi == upper_32_bits(lookup->route);
3778 }
3779
3780 /* Root switch is matched only by depth */
3781 if (!lookup->depth)
3782 return !sw->depth;
3783
3784 return sw->link == lookup->link && sw->depth == lookup->depth;
3785}
3786
3787/**
3788 * tb_switch_find_by_link_depth() - Find switch by link and depth
3789 * @tb: Domain the switch belongs
3790 * @link: Link number the switch is connected
3791 * @depth: Depth of the switch in link
3792 *
3793 * Returned switch has reference count increased so the caller needs to
3794 * call tb_switch_put() when done with the switch.
3795 *
3796 * Return: Pointer to &struct tb_switch, %NULL if not found.
3797 */
3798struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
3799{
3800 struct tb_sw_lookup lookup;
3801 struct device *dev;
3802
3803 memset(&lookup, 0, sizeof(lookup));
3804 lookup.tb = tb;
3805 lookup.link = link;
3806 lookup.depth = depth;
3807
3808 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3809 if (dev)
3810 return tb_to_switch(dev);
3811
3812 return NULL;
3813}
3814
3815/**
3816 * tb_switch_find_by_uuid() - Find switch by UUID
3817 * @tb: Domain the switch belongs
3818 * @uuid: UUID to look for
3819 *
3820 * Returned switch has reference count increased so the caller needs to
3821 * call tb_switch_put() when done with the switch.
3822 *
3823 * Return: Pointer to &struct tb_switch, %NULL if not found.
3824 */
3825struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
3826{
3827 struct tb_sw_lookup lookup;
3828 struct device *dev;
3829
3830 memset(&lookup, 0, sizeof(lookup));
3831 lookup.tb = tb;
3832 lookup.uuid = uuid;
3833
3834 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3835 if (dev)
3836 return tb_to_switch(dev);
3837
3838 return NULL;
3839}
3840
3841/**
3842 * tb_switch_find_by_route() - Find switch by route string
3843 * @tb: Domain the switch belongs
3844 * @route: Route string to look for
3845 *
3846 * Returned switch has reference count increased so the caller needs to
3847 * call tb_switch_put() when done with the switch.
3848 *
3849 * Return: Pointer to &struct tb_switch, %NULL if not found.
3850 */
3851struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
3852{
3853 struct tb_sw_lookup lookup;
3854 struct device *dev;
3855
3856 if (!route)
3857 return tb_switch_get(tb->root_switch);
3858
3859 memset(&lookup, 0, sizeof(lookup));
3860 lookup.tb = tb;
3861 lookup.route = route;
3862
3863 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3864 if (dev)
3865 return tb_to_switch(dev);
3866
3867 return NULL;
3868}
3869
3870/**
3871 * tb_switch_find_port() - return the first port of @type on @sw or NULL
3872 * @sw: Switch to find the port from
3873 * @type: Port type to look for
3874 *
3875 * Return: Pointer to &struct tb_port, %NULL if not found.
3876 */
3877struct tb_port *tb_switch_find_port(struct tb_switch *sw,
3878 enum tb_port_type type)
3879{
3880 struct tb_port *port;
3881
3882 tb_switch_for_each_port(sw, port) {
3883 if (port->config.type == type)
3884 return port;
3885 }
3886
3887 return NULL;
3888}
3889
3890/*
3891 * Can be used for read/write a specified PCIe bridge for any Thunderbolt 3
3892 * device. For now used only for Titan Ridge.
3893 */
3894static int tb_switch_pcie_bridge_write(struct tb_switch *sw, unsigned int bridge,
3895 unsigned int pcie_offset, u32 value)
3896{
3897 u32 offset, command, val;
3898 int ret;
3899
3900 if (sw->generation != 3)
3901 return -EOPNOTSUPP;
3902
3903 offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_WR_DATA;
3904 ret = tb_sw_write(sw, &value, TB_CFG_SWITCH, offset, 1);
3905 if (ret)
3906 return ret;
3907
3908 command = pcie_offset & TB_PLUG_EVENTS_PCIE_CMD_DW_OFFSET_MASK;
3909 command |= BIT(bridge + TB_PLUG_EVENTS_PCIE_CMD_BR_SHIFT);
3910 command |= TB_PLUG_EVENTS_PCIE_CMD_RD_WR_MASK;
3911 command |= TB_PLUG_EVENTS_PCIE_CMD_COMMAND_VAL
3912 << TB_PLUG_EVENTS_PCIE_CMD_COMMAND_SHIFT;
3913 command |= TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK;
3914
3915 offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_CMD;
3916
3917 ret = tb_sw_write(sw, &command, TB_CFG_SWITCH, offset, 1);
3918 if (ret)
3919 return ret;
3920
3921 ret = tb_switch_wait_for_bit(sw, offset,
3922 TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK, 0, 100);
3923 if (ret)
3924 return ret;
3925
3926 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
3927 if (ret)
3928 return ret;
3929
3930 if (val & TB_PLUG_EVENTS_PCIE_CMD_TIMEOUT_MASK)
3931 return -ETIMEDOUT;
3932
3933 return 0;
3934}
3935
3936/**
3937 * tb_switch_pcie_l1_enable() - Enable PCIe link to enter L1 state
3938 * @sw: Router to enable PCIe L1
3939 *
3940 * For Titan Ridge switch to enter CLx state, its PCIe bridges shall enable
3941 * entry to PCIe L1 state. Shall be called after the upstream PCIe tunnel
3942 * was configured. Due to Intel platforms limitation, shall be called only
3943 * for first hop switch.
3944 *
3945 * Return: %0 on success, negative errno otherwise.
3946 */
3947int tb_switch_pcie_l1_enable(struct tb_switch *sw)
3948{
3949 struct tb_switch *parent = tb_switch_parent(sw);
3950 int ret;
3951
3952 if (!tb_route(sw))
3953 return 0;
3954
3955 if (!tb_switch_is_titan_ridge(sw))
3956 return 0;
3957
3958 /* Enable PCIe L1 enable only for first hop router (depth = 1) */
3959 if (tb_route(parent))
3960 return 0;
3961
3962 /* Write to downstream PCIe bridge #5 aka Dn4 */
3963 ret = tb_switch_pcie_bridge_write(sw, 5, 0x143, 0x0c7806b1);
3964 if (ret)
3965 return ret;
3966
3967 /* Write to Upstream PCIe bridge #0 aka Up0 */
3968 return tb_switch_pcie_bridge_write(sw, 0, 0x143, 0x0c5806b1);
3969}
3970
3971/**
3972 * tb_switch_xhci_connect() - Connect internal xHCI
3973 * @sw: Router whose xHCI to connect
3974 *
3975 * Can be called to any router. For Alpine Ridge and Titan Ridge
3976 * performs special flows that bring the xHCI functional for any device
3977 * connected to the type-C port. Call only after PCIe tunnel has been
3978 * established. The function only does the connect if not done already
3979 * so can be called several times for the same router.
3980 *
3981 * Return: %0 on success, negative errno otherwise.
3982 */
3983int tb_switch_xhci_connect(struct tb_switch *sw)
3984{
3985 struct tb_port *port1, *port3;
3986 int ret;
3987
3988 if (sw->generation != 3)
3989 return 0;
3990
3991 port1 = &sw->ports[1];
3992 port3 = &sw->ports[3];
3993
3994 if (tb_switch_is_alpine_ridge(sw)) {
3995 bool usb_port1, usb_port3, xhci_port1, xhci_port3;
3996
3997 usb_port1 = tb_lc_is_usb_plugged(port1);
3998 usb_port3 = tb_lc_is_usb_plugged(port3);
3999 xhci_port1 = tb_lc_is_xhci_connected(port1);
4000 xhci_port3 = tb_lc_is_xhci_connected(port3);
4001
4002 /* Figure out correct USB port to connect */
4003 if (usb_port1 && !xhci_port1) {
4004 ret = tb_lc_xhci_connect(port1);
4005 if (ret)
4006 return ret;
4007 }
4008 if (usb_port3 && !xhci_port3)
4009 return tb_lc_xhci_connect(port3);
4010 } else if (tb_switch_is_titan_ridge(sw)) {
4011 ret = tb_lc_xhci_connect(port1);
4012 if (ret)
4013 return ret;
4014 return tb_lc_xhci_connect(port3);
4015 }
4016
4017 return 0;
4018}
4019
4020/**
4021 * tb_switch_xhci_disconnect() - Disconnect internal xHCI
4022 * @sw: Router whose xHCI to disconnect
4023 *
4024 * The opposite of tb_switch_xhci_connect(). Disconnects xHCI on both
4025 * ports.
4026 */
4027void tb_switch_xhci_disconnect(struct tb_switch *sw)
4028{
4029 if (sw->generation == 3) {
4030 struct tb_port *port1 = &sw->ports[1];
4031 struct tb_port *port3 = &sw->ports[3];
4032
4033 tb_lc_xhci_disconnect(port1);
4034 tb_port_dbg(port1, "disconnected xHCI\n");
4035 tb_lc_xhci_disconnect(port3);
4036 tb_port_dbg(port3, "disconnected xHCI\n");
4037 }
4038}