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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Thunderbolt driver - switch/port utility functions
4 *
5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
6 * Copyright (C) 2018, Intel Corporation
7 */
8
9#include <linux/delay.h>
10#include <linux/idr.h>
11#include <linux/nvmem-provider.h>
12#include <linux/pm_runtime.h>
13#include <linux/sched/signal.h>
14#include <linux/sizes.h>
15#include <linux/slab.h>
16#include <linux/vmalloc.h>
17
18#include "tb.h"
19
20/* Switch NVM support */
21
22#define NVM_DEVID 0x05
23#define NVM_VERSION 0x08
24#define NVM_CSS 0x10
25#define NVM_FLASH_SIZE 0x45
26
27#define NVM_MIN_SIZE SZ_32K
28#define NVM_MAX_SIZE SZ_512K
29
30static DEFINE_IDA(nvm_ida);
31
32struct nvm_auth_status {
33 struct list_head list;
34 uuid_t uuid;
35 u32 status;
36};
37
38/*
39 * Hold NVM authentication failure status per switch This information
40 * needs to stay around even when the switch gets power cycled so we
41 * keep it separately.
42 */
43static LIST_HEAD(nvm_auth_status_cache);
44static DEFINE_MUTEX(nvm_auth_status_lock);
45
46static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw)
47{
48 struct nvm_auth_status *st;
49
50 list_for_each_entry(st, &nvm_auth_status_cache, list) {
51 if (uuid_equal(&st->uuid, sw->uuid))
52 return st;
53 }
54
55 return NULL;
56}
57
58static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status)
59{
60 struct nvm_auth_status *st;
61
62 mutex_lock(&nvm_auth_status_lock);
63 st = __nvm_get_auth_status(sw);
64 mutex_unlock(&nvm_auth_status_lock);
65
66 *status = st ? st->status : 0;
67}
68
69static void nvm_set_auth_status(const struct tb_switch *sw, u32 status)
70{
71 struct nvm_auth_status *st;
72
73 if (WARN_ON(!sw->uuid))
74 return;
75
76 mutex_lock(&nvm_auth_status_lock);
77 st = __nvm_get_auth_status(sw);
78
79 if (!st) {
80 st = kzalloc(sizeof(*st), GFP_KERNEL);
81 if (!st)
82 goto unlock;
83
84 memcpy(&st->uuid, sw->uuid, sizeof(st->uuid));
85 INIT_LIST_HEAD(&st->list);
86 list_add_tail(&st->list, &nvm_auth_status_cache);
87 }
88
89 st->status = status;
90unlock:
91 mutex_unlock(&nvm_auth_status_lock);
92}
93
94static void nvm_clear_auth_status(const struct tb_switch *sw)
95{
96 struct nvm_auth_status *st;
97
98 mutex_lock(&nvm_auth_status_lock);
99 st = __nvm_get_auth_status(sw);
100 if (st) {
101 list_del(&st->list);
102 kfree(st);
103 }
104 mutex_unlock(&nvm_auth_status_lock);
105}
106
107static int nvm_validate_and_write(struct tb_switch *sw)
108{
109 unsigned int image_size, hdr_size;
110 const u8 *buf = sw->nvm->buf;
111 u16 ds_size;
112 int ret;
113
114 if (!buf)
115 return -EINVAL;
116
117 image_size = sw->nvm->buf_data_size;
118 if (image_size < NVM_MIN_SIZE || image_size > NVM_MAX_SIZE)
119 return -EINVAL;
120
121 /*
122 * FARB pointer must point inside the image and must at least
123 * contain parts of the digital section we will be reading here.
124 */
125 hdr_size = (*(u32 *)buf) & 0xffffff;
126 if (hdr_size + NVM_DEVID + 2 >= image_size)
127 return -EINVAL;
128
129 /* Digital section start should be aligned to 4k page */
130 if (!IS_ALIGNED(hdr_size, SZ_4K))
131 return -EINVAL;
132
133 /*
134 * Read digital section size and check that it also fits inside
135 * the image.
136 */
137 ds_size = *(u16 *)(buf + hdr_size);
138 if (ds_size >= image_size)
139 return -EINVAL;
140
141 if (!sw->safe_mode) {
142 u16 device_id;
143
144 /*
145 * Make sure the device ID in the image matches the one
146 * we read from the switch config space.
147 */
148 device_id = *(u16 *)(buf + hdr_size + NVM_DEVID);
149 if (device_id != sw->config.device_id)
150 return -EINVAL;
151
152 if (sw->generation < 3) {
153 /* Write CSS headers first */
154 ret = dma_port_flash_write(sw->dma_port,
155 DMA_PORT_CSS_ADDRESS, buf + NVM_CSS,
156 DMA_PORT_CSS_MAX_SIZE);
157 if (ret)
158 return ret;
159 }
160
161 /* Skip headers in the image */
162 buf += hdr_size;
163 image_size -= hdr_size;
164 }
165
166 return dma_port_flash_write(sw->dma_port, 0, buf, image_size);
167}
168
169static int nvm_authenticate_host(struct tb_switch *sw)
170{
171 int ret;
172
173 /*
174 * Root switch NVM upgrade requires that we disconnect the
175 * existing paths first (in case it is not in safe mode
176 * already).
177 */
178 if (!sw->safe_mode) {
179 ret = tb_domain_disconnect_all_paths(sw->tb);
180 if (ret)
181 return ret;
182 /*
183 * The host controller goes away pretty soon after this if
184 * everything goes well so getting timeout is expected.
185 */
186 ret = dma_port_flash_update_auth(sw->dma_port);
187 return ret == -ETIMEDOUT ? 0 : ret;
188 }
189
190 /*
191 * From safe mode we can get out by just power cycling the
192 * switch.
193 */
194 dma_port_power_cycle(sw->dma_port);
195 return 0;
196}
197
198static int nvm_authenticate_device(struct tb_switch *sw)
199{
200 int ret, retries = 10;
201
202 ret = dma_port_flash_update_auth(sw->dma_port);
203 if (ret && ret != -ETIMEDOUT)
204 return ret;
205
206 /*
207 * Poll here for the authentication status. It takes some time
208 * for the device to respond (we get timeout for a while). Once
209 * we get response the device needs to be power cycled in order
210 * to the new NVM to be taken into use.
211 */
212 do {
213 u32 status;
214
215 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
216 if (ret < 0 && ret != -ETIMEDOUT)
217 return ret;
218 if (ret > 0) {
219 if (status) {
220 tb_sw_warn(sw, "failed to authenticate NVM\n");
221 nvm_set_auth_status(sw, status);
222 }
223
224 tb_sw_info(sw, "power cycling the switch now\n");
225 dma_port_power_cycle(sw->dma_port);
226 return 0;
227 }
228
229 msleep(500);
230 } while (--retries);
231
232 return -ETIMEDOUT;
233}
234
235static int tb_switch_nvm_read(void *priv, unsigned int offset, void *val,
236 size_t bytes)
237{
238 struct tb_switch *sw = priv;
239 int ret;
240
241 pm_runtime_get_sync(&sw->dev);
242
243 if (!mutex_trylock(&sw->tb->lock)) {
244 ret = restart_syscall();
245 goto out;
246 }
247
248 ret = dma_port_flash_read(sw->dma_port, offset, val, bytes);
249 mutex_unlock(&sw->tb->lock);
250
251out:
252 pm_runtime_mark_last_busy(&sw->dev);
253 pm_runtime_put_autosuspend(&sw->dev);
254
255 return ret;
256}
257
258static int tb_switch_nvm_write(void *priv, unsigned int offset, void *val,
259 size_t bytes)
260{
261 struct tb_switch *sw = priv;
262 int ret = 0;
263
264 if (!mutex_trylock(&sw->tb->lock))
265 return restart_syscall();
266
267 /*
268 * Since writing the NVM image might require some special steps,
269 * for example when CSS headers are written, we cache the image
270 * locally here and handle the special cases when the user asks
271 * us to authenticate the image.
272 */
273 if (!sw->nvm->buf) {
274 sw->nvm->buf = vmalloc(NVM_MAX_SIZE);
275 if (!sw->nvm->buf) {
276 ret = -ENOMEM;
277 goto unlock;
278 }
279 }
280
281 sw->nvm->buf_data_size = offset + bytes;
282 memcpy(sw->nvm->buf + offset, val, bytes);
283
284unlock:
285 mutex_unlock(&sw->tb->lock);
286
287 return ret;
288}
289
290static struct nvmem_device *register_nvmem(struct tb_switch *sw, int id,
291 size_t size, bool active)
292{
293 struct nvmem_config config;
294
295 memset(&config, 0, sizeof(config));
296
297 if (active) {
298 config.name = "nvm_active";
299 config.reg_read = tb_switch_nvm_read;
300 config.read_only = true;
301 } else {
302 config.name = "nvm_non_active";
303 config.reg_write = tb_switch_nvm_write;
304 config.root_only = true;
305 }
306
307 config.id = id;
308 config.stride = 4;
309 config.word_size = 4;
310 config.size = size;
311 config.dev = &sw->dev;
312 config.owner = THIS_MODULE;
313 config.priv = sw;
314
315 return nvmem_register(&config);
316}
317
318static int tb_switch_nvm_add(struct tb_switch *sw)
319{
320 struct nvmem_device *nvm_dev;
321 struct tb_switch_nvm *nvm;
322 u32 val;
323 int ret;
324
325 if (!sw->dma_port)
326 return 0;
327
328 nvm = kzalloc(sizeof(*nvm), GFP_KERNEL);
329 if (!nvm)
330 return -ENOMEM;
331
332 nvm->id = ida_simple_get(&nvm_ida, 0, 0, GFP_KERNEL);
333
334 /*
335 * If the switch is in safe-mode the only accessible portion of
336 * the NVM is the non-active one where userspace is expected to
337 * write new functional NVM.
338 */
339 if (!sw->safe_mode) {
340 u32 nvm_size, hdr_size;
341
342 ret = dma_port_flash_read(sw->dma_port, NVM_FLASH_SIZE, &val,
343 sizeof(val));
344 if (ret)
345 goto err_ida;
346
347 hdr_size = sw->generation < 3 ? SZ_8K : SZ_16K;
348 nvm_size = (SZ_1M << (val & 7)) / 8;
349 nvm_size = (nvm_size - hdr_size) / 2;
350
351 ret = dma_port_flash_read(sw->dma_port, NVM_VERSION, &val,
352 sizeof(val));
353 if (ret)
354 goto err_ida;
355
356 nvm->major = val >> 16;
357 nvm->minor = val >> 8;
358
359 nvm_dev = register_nvmem(sw, nvm->id, nvm_size, true);
360 if (IS_ERR(nvm_dev)) {
361 ret = PTR_ERR(nvm_dev);
362 goto err_ida;
363 }
364 nvm->active = nvm_dev;
365 }
366
367 if (!sw->no_nvm_upgrade) {
368 nvm_dev = register_nvmem(sw, nvm->id, NVM_MAX_SIZE, false);
369 if (IS_ERR(nvm_dev)) {
370 ret = PTR_ERR(nvm_dev);
371 goto err_nvm_active;
372 }
373 nvm->non_active = nvm_dev;
374 }
375
376 sw->nvm = nvm;
377 return 0;
378
379err_nvm_active:
380 if (nvm->active)
381 nvmem_unregister(nvm->active);
382err_ida:
383 ida_simple_remove(&nvm_ida, nvm->id);
384 kfree(nvm);
385
386 return ret;
387}
388
389static void tb_switch_nvm_remove(struct tb_switch *sw)
390{
391 struct tb_switch_nvm *nvm;
392
393 nvm = sw->nvm;
394 sw->nvm = NULL;
395
396 if (!nvm)
397 return;
398
399 /* Remove authentication status in case the switch is unplugged */
400 if (!nvm->authenticating)
401 nvm_clear_auth_status(sw);
402
403 if (nvm->non_active)
404 nvmem_unregister(nvm->non_active);
405 if (nvm->active)
406 nvmem_unregister(nvm->active);
407 ida_simple_remove(&nvm_ida, nvm->id);
408 vfree(nvm->buf);
409 kfree(nvm);
410}
411
412/* port utility functions */
413
414static const char *tb_port_type(struct tb_regs_port_header *port)
415{
416 switch (port->type >> 16) {
417 case 0:
418 switch ((u8) port->type) {
419 case 0:
420 return "Inactive";
421 case 1:
422 return "Port";
423 case 2:
424 return "NHI";
425 default:
426 return "unknown";
427 }
428 case 0x2:
429 return "Ethernet";
430 case 0x8:
431 return "SATA";
432 case 0xe:
433 return "DP/HDMI";
434 case 0x10:
435 return "PCIe";
436 case 0x20:
437 return "USB";
438 default:
439 return "unknown";
440 }
441}
442
443static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
444{
445 tb_dbg(tb,
446 " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
447 port->port_number, port->vendor_id, port->device_id,
448 port->revision, port->thunderbolt_version, tb_port_type(port),
449 port->type);
450 tb_dbg(tb, " Max hop id (in/out): %d/%d\n",
451 port->max_in_hop_id, port->max_out_hop_id);
452 tb_dbg(tb, " Max counters: %d\n", port->max_counters);
453 tb_dbg(tb, " NFC Credits: %#x\n", port->nfc_credits);
454}
455
456/**
457 * tb_port_state() - get connectedness state of a port
458 *
459 * The port must have a TB_CAP_PHY (i.e. it should be a real port).
460 *
461 * Return: Returns an enum tb_port_state on success or an error code on failure.
462 */
463static int tb_port_state(struct tb_port *port)
464{
465 struct tb_cap_phy phy;
466 int res;
467 if (port->cap_phy == 0) {
468 tb_port_WARN(port, "does not have a PHY\n");
469 return -EINVAL;
470 }
471 res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
472 if (res)
473 return res;
474 return phy.state;
475}
476
477/**
478 * tb_wait_for_port() - wait for a port to become ready
479 *
480 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
481 * wait_if_unplugged is set then we also wait if the port is in state
482 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
483 * switch resume). Otherwise we only wait if a device is registered but the link
484 * has not yet been established.
485 *
486 * Return: Returns an error code on failure. Returns 0 if the port is not
487 * connected or failed to reach state TB_PORT_UP within one second. Returns 1
488 * if the port is connected and in state TB_PORT_UP.
489 */
490int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
491{
492 int retries = 10;
493 int state;
494 if (!port->cap_phy) {
495 tb_port_WARN(port, "does not have PHY\n");
496 return -EINVAL;
497 }
498 if (tb_is_upstream_port(port)) {
499 tb_port_WARN(port, "is the upstream port\n");
500 return -EINVAL;
501 }
502
503 while (retries--) {
504 state = tb_port_state(port);
505 if (state < 0)
506 return state;
507 if (state == TB_PORT_DISABLED) {
508 tb_port_dbg(port, "is disabled (state: 0)\n");
509 return 0;
510 }
511 if (state == TB_PORT_UNPLUGGED) {
512 if (wait_if_unplugged) {
513 /* used during resume */
514 tb_port_dbg(port,
515 "is unplugged (state: 7), retrying...\n");
516 msleep(100);
517 continue;
518 }
519 tb_port_dbg(port, "is unplugged (state: 7)\n");
520 return 0;
521 }
522 if (state == TB_PORT_UP) {
523 tb_port_dbg(port, "is connected, link is up (state: 2)\n");
524 return 1;
525 }
526
527 /*
528 * After plug-in the state is TB_PORT_CONNECTING. Give it some
529 * time.
530 */
531 tb_port_dbg(port,
532 "is connected, link is not up (state: %d), retrying...\n",
533 state);
534 msleep(100);
535 }
536 tb_port_warn(port,
537 "failed to reach state TB_PORT_UP. Ignoring port...\n");
538 return 0;
539}
540
541/**
542 * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
543 *
544 * Change the number of NFC credits allocated to @port by @credits. To remove
545 * NFC credits pass a negative amount of credits.
546 *
547 * Return: Returns 0 on success or an error code on failure.
548 */
549int tb_port_add_nfc_credits(struct tb_port *port, int credits)
550{
551 u32 nfc_credits;
552
553 if (credits == 0 || port->sw->is_unplugged)
554 return 0;
555
556 nfc_credits = port->config.nfc_credits & TB_PORT_NFC_CREDITS_MASK;
557 nfc_credits += credits;
558
559 tb_port_dbg(port, "adding %d NFC credits to %lu",
560 credits, port->config.nfc_credits & TB_PORT_NFC_CREDITS_MASK);
561
562 port->config.nfc_credits &= ~TB_PORT_NFC_CREDITS_MASK;
563 port->config.nfc_credits |= nfc_credits;
564
565 return tb_port_write(port, &port->config.nfc_credits,
566 TB_CFG_PORT, 4, 1);
567}
568
569/**
570 * tb_port_set_initial_credits() - Set initial port link credits allocated
571 * @port: Port to set the initial credits
572 * @credits: Number of credits to to allocate
573 *
574 * Set initial credits value to be used for ingress shared buffering.
575 */
576int tb_port_set_initial_credits(struct tb_port *port, u32 credits)
577{
578 u32 data;
579 int ret;
580
581 ret = tb_port_read(port, &data, TB_CFG_PORT, 5, 1);
582 if (ret)
583 return ret;
584
585 data &= ~TB_PORT_LCA_MASK;
586 data |= (credits << TB_PORT_LCA_SHIFT) & TB_PORT_LCA_MASK;
587
588 return tb_port_write(port, &data, TB_CFG_PORT, 5, 1);
589}
590
591/**
592 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
593 *
594 * Return: Returns 0 on success or an error code on failure.
595 */
596int tb_port_clear_counter(struct tb_port *port, int counter)
597{
598 u32 zero[3] = { 0, 0, 0 };
599 tb_port_dbg(port, "clearing counter %d\n", counter);
600 return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
601}
602
603/**
604 * tb_init_port() - initialize a port
605 *
606 * This is a helper method for tb_switch_alloc. Does not check or initialize
607 * any downstream switches.
608 *
609 * Return: Returns 0 on success or an error code on failure.
610 */
611static int tb_init_port(struct tb_port *port)
612{
613 int res;
614 int cap;
615
616 res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
617 if (res) {
618 if (res == -ENODEV) {
619 tb_dbg(port->sw->tb, " Port %d: not implemented\n",
620 port->port);
621 return 0;
622 }
623 return res;
624 }
625
626 /* Port 0 is the switch itself and has no PHY. */
627 if (port->config.type == TB_TYPE_PORT && port->port != 0) {
628 cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
629
630 if (cap > 0)
631 port->cap_phy = cap;
632 else
633 tb_port_WARN(port, "non switch port without a PHY\n");
634 } else if (port->port != 0) {
635 cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
636 if (cap > 0)
637 port->cap_adap = cap;
638 }
639
640 tb_dump_port(port->sw->tb, &port->config);
641
642 /* Control port does not need HopID allocation */
643 if (port->port) {
644 ida_init(&port->in_hopids);
645 ida_init(&port->out_hopids);
646 }
647
648 return 0;
649
650}
651
652static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,
653 int max_hopid)
654{
655 int port_max_hopid;
656 struct ida *ida;
657
658 if (in) {
659 port_max_hopid = port->config.max_in_hop_id;
660 ida = &port->in_hopids;
661 } else {
662 port_max_hopid = port->config.max_out_hop_id;
663 ida = &port->out_hopids;
664 }
665
666 /* HopIDs 0-7 are reserved */
667 if (min_hopid < TB_PATH_MIN_HOPID)
668 min_hopid = TB_PATH_MIN_HOPID;
669
670 if (max_hopid < 0 || max_hopid > port_max_hopid)
671 max_hopid = port_max_hopid;
672
673 return ida_simple_get(ida, min_hopid, max_hopid + 1, GFP_KERNEL);
674}
675
676/**
677 * tb_port_alloc_in_hopid() - Allocate input HopID from port
678 * @port: Port to allocate HopID for
679 * @min_hopid: Minimum acceptable input HopID
680 * @max_hopid: Maximum acceptable input HopID
681 *
682 * Return: HopID between @min_hopid and @max_hopid or negative errno in
683 * case of error.
684 */
685int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)
686{
687 return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);
688}
689
690/**
691 * tb_port_alloc_out_hopid() - Allocate output HopID from port
692 * @port: Port to allocate HopID for
693 * @min_hopid: Minimum acceptable output HopID
694 * @max_hopid: Maximum acceptable output HopID
695 *
696 * Return: HopID between @min_hopid and @max_hopid or negative errno in
697 * case of error.
698 */
699int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)
700{
701 return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);
702}
703
704/**
705 * tb_port_release_in_hopid() - Release allocated input HopID from port
706 * @port: Port whose HopID to release
707 * @hopid: HopID to release
708 */
709void tb_port_release_in_hopid(struct tb_port *port, int hopid)
710{
711 ida_simple_remove(&port->in_hopids, hopid);
712}
713
714/**
715 * tb_port_release_out_hopid() - Release allocated output HopID from port
716 * @port: Port whose HopID to release
717 * @hopid: HopID to release
718 */
719void tb_port_release_out_hopid(struct tb_port *port, int hopid)
720{
721 ida_simple_remove(&port->out_hopids, hopid);
722}
723
724/**
725 * tb_next_port_on_path() - Return next port for given port on a path
726 * @start: Start port of the walk
727 * @end: End port of the walk
728 * @prev: Previous port (%NULL if this is the first)
729 *
730 * This function can be used to walk from one port to another if they
731 * are connected through zero or more switches. If the @prev is dual
732 * link port, the function follows that link and returns another end on
733 * that same link.
734 *
735 * If the @end port has been reached, return %NULL.
736 *
737 * Domain tb->lock must be held when this function is called.
738 */
739struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
740 struct tb_port *prev)
741{
742 struct tb_port *next;
743
744 if (!prev)
745 return start;
746
747 if (prev->sw == end->sw) {
748 if (prev == end)
749 return NULL;
750 return end;
751 }
752
753 if (start->sw->config.depth < end->sw->config.depth) {
754 if (prev->remote &&
755 prev->remote->sw->config.depth > prev->sw->config.depth)
756 next = prev->remote;
757 else
758 next = tb_port_at(tb_route(end->sw), prev->sw);
759 } else {
760 if (tb_is_upstream_port(prev)) {
761 next = prev->remote;
762 } else {
763 next = tb_upstream_port(prev->sw);
764 /*
765 * Keep the same link if prev and next are both
766 * dual link ports.
767 */
768 if (next->dual_link_port &&
769 next->link_nr != prev->link_nr) {
770 next = next->dual_link_port;
771 }
772 }
773 }
774
775 return next;
776}
777
778/**
779 * tb_port_is_enabled() - Is the adapter port enabled
780 * @port: Port to check
781 */
782bool tb_port_is_enabled(struct tb_port *port)
783{
784 switch (port->config.type) {
785 case TB_TYPE_PCIE_UP:
786 case TB_TYPE_PCIE_DOWN:
787 return tb_pci_port_is_enabled(port);
788
789 case TB_TYPE_DP_HDMI_IN:
790 case TB_TYPE_DP_HDMI_OUT:
791 return tb_dp_port_is_enabled(port);
792
793 default:
794 return false;
795 }
796}
797
798/**
799 * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
800 * @port: PCIe port to check
801 */
802bool tb_pci_port_is_enabled(struct tb_port *port)
803{
804 u32 data;
805
806 if (tb_port_read(port, &data, TB_CFG_PORT, port->cap_adap, 1))
807 return false;
808
809 return !!(data & TB_PCI_EN);
810}
811
812/**
813 * tb_pci_port_enable() - Enable PCIe adapter port
814 * @port: PCIe port to enable
815 * @enable: Enable/disable the PCIe adapter
816 */
817int tb_pci_port_enable(struct tb_port *port, bool enable)
818{
819 u32 word = enable ? TB_PCI_EN : 0x0;
820 if (!port->cap_adap)
821 return -ENXIO;
822 return tb_port_write(port, &word, TB_CFG_PORT, port->cap_adap, 1);
823}
824
825/**
826 * tb_dp_port_hpd_is_active() - Is HPD already active
827 * @port: DP out port to check
828 *
829 * Checks if the DP OUT adapter port has HDP bit already set.
830 */
831int tb_dp_port_hpd_is_active(struct tb_port *port)
832{
833 u32 data;
834 int ret;
835
836 ret = tb_port_read(port, &data, TB_CFG_PORT, port->cap_adap + 2, 1);
837 if (ret)
838 return ret;
839
840 return !!(data & TB_DP_HDP);
841}
842
843/**
844 * tb_dp_port_hpd_clear() - Clear HPD from DP IN port
845 * @port: Port to clear HPD
846 *
847 * If the DP IN port has HDP set, this function can be used to clear it.
848 */
849int tb_dp_port_hpd_clear(struct tb_port *port)
850{
851 u32 data;
852 int ret;
853
854 ret = tb_port_read(port, &data, TB_CFG_PORT, port->cap_adap + 3, 1);
855 if (ret)
856 return ret;
857
858 data |= TB_DP_HPDC;
859 return tb_port_write(port, &data, TB_CFG_PORT, port->cap_adap + 3, 1);
860}
861
862/**
863 * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
864 * @port: DP IN/OUT port to set hops
865 * @video: Video Hop ID
866 * @aux_tx: AUX TX Hop ID
867 * @aux_rx: AUX RX Hop ID
868 *
869 * Programs specified Hop IDs for DP IN/OUT port.
870 */
871int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
872 unsigned int aux_tx, unsigned int aux_rx)
873{
874 u32 data[2];
875 int ret;
876
877 ret = tb_port_read(port, data, TB_CFG_PORT, port->cap_adap,
878 ARRAY_SIZE(data));
879 if (ret)
880 return ret;
881
882 data[0] &= ~TB_DP_VIDEO_HOPID_MASK;
883 data[1] &= ~(TB_DP_AUX_RX_HOPID_MASK | TB_DP_AUX_TX_HOPID_MASK);
884
885 data[0] |= (video << TB_DP_VIDEO_HOPID_SHIFT) & TB_DP_VIDEO_HOPID_MASK;
886 data[1] |= aux_tx & TB_DP_AUX_TX_HOPID_MASK;
887 data[1] |= (aux_rx << TB_DP_AUX_RX_HOPID_SHIFT) & TB_DP_AUX_RX_HOPID_MASK;
888
889 return tb_port_write(port, data, TB_CFG_PORT, port->cap_adap,
890 ARRAY_SIZE(data));
891}
892
893/**
894 * tb_dp_port_is_enabled() - Is DP adapter port enabled
895 * @port: DP adapter port to check
896 */
897bool tb_dp_port_is_enabled(struct tb_port *port)
898{
899 u32 data[2];
900
901 if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap,
902 ARRAY_SIZE(data)))
903 return false;
904
905 return !!(data[0] & (TB_DP_VIDEO_EN | TB_DP_AUX_EN));
906}
907
908/**
909 * tb_dp_port_enable() - Enables/disables DP paths of a port
910 * @port: DP IN/OUT port
911 * @enable: Enable/disable DP path
912 *
913 * Once Hop IDs are programmed DP paths can be enabled or disabled by
914 * calling this function.
915 */
916int tb_dp_port_enable(struct tb_port *port, bool enable)
917{
918 u32 data[2];
919 int ret;
920
921 ret = tb_port_read(port, data, TB_CFG_PORT, port->cap_adap,
922 ARRAY_SIZE(data));
923 if (ret)
924 return ret;
925
926 if (enable)
927 data[0] |= TB_DP_VIDEO_EN | TB_DP_AUX_EN;
928 else
929 data[0] &= ~(TB_DP_VIDEO_EN | TB_DP_AUX_EN);
930
931 return tb_port_write(port, data, TB_CFG_PORT, port->cap_adap,
932 ARRAY_SIZE(data));
933}
934
935/* switch utility functions */
936
937static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
938{
939 tb_dbg(tb, " Switch: %x:%x (Revision: %d, TB Version: %d)\n",
940 sw->vendor_id, sw->device_id, sw->revision,
941 sw->thunderbolt_version);
942 tb_dbg(tb, " Max Port Number: %d\n", sw->max_port_number);
943 tb_dbg(tb, " Config:\n");
944 tb_dbg(tb,
945 " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
946 sw->upstream_port_number, sw->depth,
947 (((u64) sw->route_hi) << 32) | sw->route_lo,
948 sw->enabled, sw->plug_events_delay);
949 tb_dbg(tb, " unknown1: %#x unknown4: %#x\n",
950 sw->__unknown1, sw->__unknown4);
951}
952
953/**
954 * reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET
955 *
956 * Return: Returns 0 on success or an error code on failure.
957 */
958int tb_switch_reset(struct tb *tb, u64 route)
959{
960 struct tb_cfg_result res;
961 struct tb_regs_switch_header header = {
962 header.route_hi = route >> 32,
963 header.route_lo = route,
964 header.enabled = true,
965 };
966 tb_dbg(tb, "resetting switch at %llx\n", route);
967 res.err = tb_cfg_write(tb->ctl, ((u32 *) &header) + 2, route,
968 0, 2, 2, 2);
969 if (res.err)
970 return res.err;
971 res = tb_cfg_reset(tb->ctl, route, TB_CFG_DEFAULT_TIMEOUT);
972 if (res.err > 0)
973 return -EIO;
974 return res.err;
975}
976
977/**
978 * tb_plug_events_active() - enable/disable plug events on a switch
979 *
980 * Also configures a sane plug_events_delay of 255ms.
981 *
982 * Return: Returns 0 on success or an error code on failure.
983 */
984static int tb_plug_events_active(struct tb_switch *sw, bool active)
985{
986 u32 data;
987 int res;
988
989 if (!sw->config.enabled)
990 return 0;
991
992 sw->config.plug_events_delay = 0xff;
993 res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
994 if (res)
995 return res;
996
997 res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
998 if (res)
999 return res;
1000
1001 if (active) {
1002 data = data & 0xFFFFFF83;
1003 switch (sw->config.device_id) {
1004 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1005 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1006 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1007 break;
1008 default:
1009 data |= 4;
1010 }
1011 } else {
1012 data = data | 0x7c;
1013 }
1014 return tb_sw_write(sw, &data, TB_CFG_SWITCH,
1015 sw->cap_plug_events + 1, 1);
1016}
1017
1018static ssize_t authorized_show(struct device *dev,
1019 struct device_attribute *attr,
1020 char *buf)
1021{
1022 struct tb_switch *sw = tb_to_switch(dev);
1023
1024 return sprintf(buf, "%u\n", sw->authorized);
1025}
1026
1027static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
1028{
1029 int ret = -EINVAL;
1030
1031 if (!mutex_trylock(&sw->tb->lock))
1032 return restart_syscall();
1033
1034 if (sw->authorized)
1035 goto unlock;
1036
1037 switch (val) {
1038 /* Approve switch */
1039 case 1:
1040 if (sw->key)
1041 ret = tb_domain_approve_switch_key(sw->tb, sw);
1042 else
1043 ret = tb_domain_approve_switch(sw->tb, sw);
1044 break;
1045
1046 /* Challenge switch */
1047 case 2:
1048 if (sw->key)
1049 ret = tb_domain_challenge_switch_key(sw->tb, sw);
1050 break;
1051
1052 default:
1053 break;
1054 }
1055
1056 if (!ret) {
1057 sw->authorized = val;
1058 /* Notify status change to the userspace */
1059 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
1060 }
1061
1062unlock:
1063 mutex_unlock(&sw->tb->lock);
1064 return ret;
1065}
1066
1067static ssize_t authorized_store(struct device *dev,
1068 struct device_attribute *attr,
1069 const char *buf, size_t count)
1070{
1071 struct tb_switch *sw = tb_to_switch(dev);
1072 unsigned int val;
1073 ssize_t ret;
1074
1075 ret = kstrtouint(buf, 0, &val);
1076 if (ret)
1077 return ret;
1078 if (val > 2)
1079 return -EINVAL;
1080
1081 pm_runtime_get_sync(&sw->dev);
1082 ret = tb_switch_set_authorized(sw, val);
1083 pm_runtime_mark_last_busy(&sw->dev);
1084 pm_runtime_put_autosuspend(&sw->dev);
1085
1086 return ret ? ret : count;
1087}
1088static DEVICE_ATTR_RW(authorized);
1089
1090static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
1091 char *buf)
1092{
1093 struct tb_switch *sw = tb_to_switch(dev);
1094
1095 return sprintf(buf, "%u\n", sw->boot);
1096}
1097static DEVICE_ATTR_RO(boot);
1098
1099static ssize_t device_show(struct device *dev, struct device_attribute *attr,
1100 char *buf)
1101{
1102 struct tb_switch *sw = tb_to_switch(dev);
1103
1104 return sprintf(buf, "%#x\n", sw->device);
1105}
1106static DEVICE_ATTR_RO(device);
1107
1108static ssize_t
1109device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1110{
1111 struct tb_switch *sw = tb_to_switch(dev);
1112
1113 return sprintf(buf, "%s\n", sw->device_name ? sw->device_name : "");
1114}
1115static DEVICE_ATTR_RO(device_name);
1116
1117static ssize_t key_show(struct device *dev, struct device_attribute *attr,
1118 char *buf)
1119{
1120 struct tb_switch *sw = tb_to_switch(dev);
1121 ssize_t ret;
1122
1123 if (!mutex_trylock(&sw->tb->lock))
1124 return restart_syscall();
1125
1126 if (sw->key)
1127 ret = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
1128 else
1129 ret = sprintf(buf, "\n");
1130
1131 mutex_unlock(&sw->tb->lock);
1132 return ret;
1133}
1134
1135static ssize_t key_store(struct device *dev, struct device_attribute *attr,
1136 const char *buf, size_t count)
1137{
1138 struct tb_switch *sw = tb_to_switch(dev);
1139 u8 key[TB_SWITCH_KEY_SIZE];
1140 ssize_t ret = count;
1141 bool clear = false;
1142
1143 if (!strcmp(buf, "\n"))
1144 clear = true;
1145 else if (hex2bin(key, buf, sizeof(key)))
1146 return -EINVAL;
1147
1148 if (!mutex_trylock(&sw->tb->lock))
1149 return restart_syscall();
1150
1151 if (sw->authorized) {
1152 ret = -EBUSY;
1153 } else {
1154 kfree(sw->key);
1155 if (clear) {
1156 sw->key = NULL;
1157 } else {
1158 sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
1159 if (!sw->key)
1160 ret = -ENOMEM;
1161 }
1162 }
1163
1164 mutex_unlock(&sw->tb->lock);
1165 return ret;
1166}
1167static DEVICE_ATTR(key, 0600, key_show, key_store);
1168
1169static void nvm_authenticate_start(struct tb_switch *sw)
1170{
1171 struct pci_dev *root_port;
1172
1173 /*
1174 * During host router NVM upgrade we should not allow root port to
1175 * go into D3cold because some root ports cannot trigger PME
1176 * itself. To be on the safe side keep the root port in D0 during
1177 * the whole upgrade process.
1178 */
1179 root_port = pci_find_pcie_root_port(sw->tb->nhi->pdev);
1180 if (root_port)
1181 pm_runtime_get_noresume(&root_port->dev);
1182}
1183
1184static void nvm_authenticate_complete(struct tb_switch *sw)
1185{
1186 struct pci_dev *root_port;
1187
1188 root_port = pci_find_pcie_root_port(sw->tb->nhi->pdev);
1189 if (root_port)
1190 pm_runtime_put(&root_port->dev);
1191}
1192
1193static ssize_t nvm_authenticate_show(struct device *dev,
1194 struct device_attribute *attr, char *buf)
1195{
1196 struct tb_switch *sw = tb_to_switch(dev);
1197 u32 status;
1198
1199 nvm_get_auth_status(sw, &status);
1200 return sprintf(buf, "%#x\n", status);
1201}
1202
1203static ssize_t nvm_authenticate_store(struct device *dev,
1204 struct device_attribute *attr, const char *buf, size_t count)
1205{
1206 struct tb_switch *sw = tb_to_switch(dev);
1207 bool val;
1208 int ret;
1209
1210 pm_runtime_get_sync(&sw->dev);
1211
1212 if (!mutex_trylock(&sw->tb->lock)) {
1213 ret = restart_syscall();
1214 goto exit_rpm;
1215 }
1216
1217 /* If NVMem devices are not yet added */
1218 if (!sw->nvm) {
1219 ret = -EAGAIN;
1220 goto exit_unlock;
1221 }
1222
1223 ret = kstrtobool(buf, &val);
1224 if (ret)
1225 goto exit_unlock;
1226
1227 /* Always clear the authentication status */
1228 nvm_clear_auth_status(sw);
1229
1230 if (val) {
1231 if (!sw->nvm->buf) {
1232 ret = -EINVAL;
1233 goto exit_unlock;
1234 }
1235
1236 ret = nvm_validate_and_write(sw);
1237 if (ret)
1238 goto exit_unlock;
1239
1240 sw->nvm->authenticating = true;
1241
1242 if (!tb_route(sw)) {
1243 /*
1244 * Keep root port from suspending as long as the
1245 * NVM upgrade process is running.
1246 */
1247 nvm_authenticate_start(sw);
1248 ret = nvm_authenticate_host(sw);
1249 if (ret)
1250 nvm_authenticate_complete(sw);
1251 } else {
1252 ret = nvm_authenticate_device(sw);
1253 }
1254 }
1255
1256exit_unlock:
1257 mutex_unlock(&sw->tb->lock);
1258exit_rpm:
1259 pm_runtime_mark_last_busy(&sw->dev);
1260 pm_runtime_put_autosuspend(&sw->dev);
1261
1262 if (ret)
1263 return ret;
1264 return count;
1265}
1266static DEVICE_ATTR_RW(nvm_authenticate);
1267
1268static ssize_t nvm_version_show(struct device *dev,
1269 struct device_attribute *attr, char *buf)
1270{
1271 struct tb_switch *sw = tb_to_switch(dev);
1272 int ret;
1273
1274 if (!mutex_trylock(&sw->tb->lock))
1275 return restart_syscall();
1276
1277 if (sw->safe_mode)
1278 ret = -ENODATA;
1279 else if (!sw->nvm)
1280 ret = -EAGAIN;
1281 else
1282 ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
1283
1284 mutex_unlock(&sw->tb->lock);
1285
1286 return ret;
1287}
1288static DEVICE_ATTR_RO(nvm_version);
1289
1290static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
1291 char *buf)
1292{
1293 struct tb_switch *sw = tb_to_switch(dev);
1294
1295 return sprintf(buf, "%#x\n", sw->vendor);
1296}
1297static DEVICE_ATTR_RO(vendor);
1298
1299static ssize_t
1300vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1301{
1302 struct tb_switch *sw = tb_to_switch(dev);
1303
1304 return sprintf(buf, "%s\n", sw->vendor_name ? sw->vendor_name : "");
1305}
1306static DEVICE_ATTR_RO(vendor_name);
1307
1308static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
1309 char *buf)
1310{
1311 struct tb_switch *sw = tb_to_switch(dev);
1312
1313 return sprintf(buf, "%pUb\n", sw->uuid);
1314}
1315static DEVICE_ATTR_RO(unique_id);
1316
1317static struct attribute *switch_attrs[] = {
1318 &dev_attr_authorized.attr,
1319 &dev_attr_boot.attr,
1320 &dev_attr_device.attr,
1321 &dev_attr_device_name.attr,
1322 &dev_attr_key.attr,
1323 &dev_attr_nvm_authenticate.attr,
1324 &dev_attr_nvm_version.attr,
1325 &dev_attr_vendor.attr,
1326 &dev_attr_vendor_name.attr,
1327 &dev_attr_unique_id.attr,
1328 NULL,
1329};
1330
1331static umode_t switch_attr_is_visible(struct kobject *kobj,
1332 struct attribute *attr, int n)
1333{
1334 struct device *dev = container_of(kobj, struct device, kobj);
1335 struct tb_switch *sw = tb_to_switch(dev);
1336
1337 if (attr == &dev_attr_device.attr) {
1338 if (!sw->device)
1339 return 0;
1340 } else if (attr == &dev_attr_device_name.attr) {
1341 if (!sw->device_name)
1342 return 0;
1343 } else if (attr == &dev_attr_vendor.attr) {
1344 if (!sw->vendor)
1345 return 0;
1346 } else if (attr == &dev_attr_vendor_name.attr) {
1347 if (!sw->vendor_name)
1348 return 0;
1349 } else if (attr == &dev_attr_key.attr) {
1350 if (tb_route(sw) &&
1351 sw->tb->security_level == TB_SECURITY_SECURE &&
1352 sw->security_level == TB_SECURITY_SECURE)
1353 return attr->mode;
1354 return 0;
1355 } else if (attr == &dev_attr_nvm_authenticate.attr) {
1356 if (sw->dma_port && !sw->no_nvm_upgrade)
1357 return attr->mode;
1358 return 0;
1359 } else if (attr == &dev_attr_nvm_version.attr) {
1360 if (sw->dma_port)
1361 return attr->mode;
1362 return 0;
1363 } else if (attr == &dev_attr_boot.attr) {
1364 if (tb_route(sw))
1365 return attr->mode;
1366 return 0;
1367 }
1368
1369 return sw->safe_mode ? 0 : attr->mode;
1370}
1371
1372static struct attribute_group switch_group = {
1373 .is_visible = switch_attr_is_visible,
1374 .attrs = switch_attrs,
1375};
1376
1377static const struct attribute_group *switch_groups[] = {
1378 &switch_group,
1379 NULL,
1380};
1381
1382static void tb_switch_release(struct device *dev)
1383{
1384 struct tb_switch *sw = tb_to_switch(dev);
1385 int i;
1386
1387 dma_port_free(sw->dma_port);
1388
1389 for (i = 1; i <= sw->config.max_port_number; i++) {
1390 if (!sw->ports[i].disabled) {
1391 ida_destroy(&sw->ports[i].in_hopids);
1392 ida_destroy(&sw->ports[i].out_hopids);
1393 }
1394 }
1395
1396 kfree(sw->uuid);
1397 kfree(sw->device_name);
1398 kfree(sw->vendor_name);
1399 kfree(sw->ports);
1400 kfree(sw->drom);
1401 kfree(sw->key);
1402 kfree(sw);
1403}
1404
1405/*
1406 * Currently only need to provide the callbacks. Everything else is handled
1407 * in the connection manager.
1408 */
1409static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
1410{
1411 struct tb_switch *sw = tb_to_switch(dev);
1412 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
1413
1414 if (cm_ops->runtime_suspend_switch)
1415 return cm_ops->runtime_suspend_switch(sw);
1416
1417 return 0;
1418}
1419
1420static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
1421{
1422 struct tb_switch *sw = tb_to_switch(dev);
1423 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
1424
1425 if (cm_ops->runtime_resume_switch)
1426 return cm_ops->runtime_resume_switch(sw);
1427 return 0;
1428}
1429
1430static const struct dev_pm_ops tb_switch_pm_ops = {
1431 SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
1432 NULL)
1433};
1434
1435struct device_type tb_switch_type = {
1436 .name = "thunderbolt_device",
1437 .release = tb_switch_release,
1438 .pm = &tb_switch_pm_ops,
1439};
1440
1441static int tb_switch_get_generation(struct tb_switch *sw)
1442{
1443 switch (sw->config.device_id) {
1444 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1445 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1446 case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
1447 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
1448 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
1449 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1450 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
1451 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
1452 return 1;
1453
1454 case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
1455 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
1456 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
1457 return 2;
1458
1459 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
1460 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
1461 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
1462 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
1463 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
1464 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
1465 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
1466 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
1467 case PCI_DEVICE_ID_INTEL_ICL_NHI0:
1468 case PCI_DEVICE_ID_INTEL_ICL_NHI1:
1469 return 3;
1470
1471 default:
1472 /*
1473 * For unknown switches assume generation to be 1 to be
1474 * on the safe side.
1475 */
1476 tb_sw_warn(sw, "unsupported switch device id %#x\n",
1477 sw->config.device_id);
1478 return 1;
1479 }
1480}
1481
1482/**
1483 * tb_switch_alloc() - allocate a switch
1484 * @tb: Pointer to the owning domain
1485 * @parent: Parent device for this switch
1486 * @route: Route string for this switch
1487 *
1488 * Allocates and initializes a switch. Will not upload configuration to
1489 * the switch. For that you need to call tb_switch_configure()
1490 * separately. The returned switch should be released by calling
1491 * tb_switch_put().
1492 *
1493 * Return: Pointer to the allocated switch or ERR_PTR() in case of
1494 * failure.
1495 */
1496struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
1497 u64 route)
1498{
1499 struct tb_switch *sw;
1500 int upstream_port;
1501 int i, ret, depth;
1502
1503 /* Make sure we do not exceed maximum topology limit */
1504 depth = tb_route_length(route);
1505 if (depth > TB_SWITCH_MAX_DEPTH)
1506 return ERR_PTR(-EADDRNOTAVAIL);
1507
1508 upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
1509 if (upstream_port < 0)
1510 return ERR_PTR(upstream_port);
1511
1512 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
1513 if (!sw)
1514 return ERR_PTR(-ENOMEM);
1515
1516 sw->tb = tb;
1517 ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);
1518 if (ret)
1519 goto err_free_sw_ports;
1520
1521 tb_dbg(tb, "current switch config:\n");
1522 tb_dump_switch(tb, &sw->config);
1523
1524 /* configure switch */
1525 sw->config.upstream_port_number = upstream_port;
1526 sw->config.depth = depth;
1527 sw->config.route_hi = upper_32_bits(route);
1528 sw->config.route_lo = lower_32_bits(route);
1529 sw->config.enabled = 0;
1530
1531 /* initialize ports */
1532 sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
1533 GFP_KERNEL);
1534 if (!sw->ports) {
1535 ret = -ENOMEM;
1536 goto err_free_sw_ports;
1537 }
1538
1539 for (i = 0; i <= sw->config.max_port_number; i++) {
1540 /* minimum setup for tb_find_cap and tb_drom_read to work */
1541 sw->ports[i].sw = sw;
1542 sw->ports[i].port = i;
1543 }
1544
1545 sw->generation = tb_switch_get_generation(sw);
1546
1547 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
1548 if (ret < 0) {
1549 tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
1550 goto err_free_sw_ports;
1551 }
1552 sw->cap_plug_events = ret;
1553
1554 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
1555 if (ret > 0)
1556 sw->cap_lc = ret;
1557
1558 /* Root switch is always authorized */
1559 if (!route)
1560 sw->authorized = true;
1561
1562 device_initialize(&sw->dev);
1563 sw->dev.parent = parent;
1564 sw->dev.bus = &tb_bus_type;
1565 sw->dev.type = &tb_switch_type;
1566 sw->dev.groups = switch_groups;
1567 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
1568
1569 return sw;
1570
1571err_free_sw_ports:
1572 kfree(sw->ports);
1573 kfree(sw);
1574
1575 return ERR_PTR(ret);
1576}
1577
1578/**
1579 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
1580 * @tb: Pointer to the owning domain
1581 * @parent: Parent device for this switch
1582 * @route: Route string for this switch
1583 *
1584 * This creates a switch in safe mode. This means the switch pretty much
1585 * lacks all capabilities except DMA configuration port before it is
1586 * flashed with a valid NVM firmware.
1587 *
1588 * The returned switch must be released by calling tb_switch_put().
1589 *
1590 * Return: Pointer to the allocated switch or ERR_PTR() in case of failure
1591 */
1592struct tb_switch *
1593tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
1594{
1595 struct tb_switch *sw;
1596
1597 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
1598 if (!sw)
1599 return ERR_PTR(-ENOMEM);
1600
1601 sw->tb = tb;
1602 sw->config.depth = tb_route_length(route);
1603 sw->config.route_hi = upper_32_bits(route);
1604 sw->config.route_lo = lower_32_bits(route);
1605 sw->safe_mode = true;
1606
1607 device_initialize(&sw->dev);
1608 sw->dev.parent = parent;
1609 sw->dev.bus = &tb_bus_type;
1610 sw->dev.type = &tb_switch_type;
1611 sw->dev.groups = switch_groups;
1612 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
1613
1614 return sw;
1615}
1616
1617/**
1618 * tb_switch_configure() - Uploads configuration to the switch
1619 * @sw: Switch to configure
1620 *
1621 * Call this function before the switch is added to the system. It will
1622 * upload configuration to the switch and makes it available for the
1623 * connection manager to use.
1624 *
1625 * Return: %0 in case of success and negative errno in case of failure
1626 */
1627int tb_switch_configure(struct tb_switch *sw)
1628{
1629 struct tb *tb = sw->tb;
1630 u64 route;
1631 int ret;
1632
1633 route = tb_route(sw);
1634 tb_dbg(tb, "initializing Switch at %#llx (depth: %d, up port: %d)\n",
1635 route, tb_route_length(route), sw->config.upstream_port_number);
1636
1637 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
1638 tb_sw_warn(sw, "unknown switch vendor id %#x\n",
1639 sw->config.vendor_id);
1640
1641 sw->config.enabled = 1;
1642
1643 /* upload configuration */
1644 ret = tb_sw_write(sw, 1 + (u32 *)&sw->config, TB_CFG_SWITCH, 1, 3);
1645 if (ret)
1646 return ret;
1647
1648 ret = tb_lc_configure_link(sw);
1649 if (ret)
1650 return ret;
1651
1652 return tb_plug_events_active(sw, true);
1653}
1654
1655static int tb_switch_set_uuid(struct tb_switch *sw)
1656{
1657 u32 uuid[4];
1658 int ret;
1659
1660 if (sw->uuid)
1661 return 0;
1662
1663 /*
1664 * The newer controllers include fused UUID as part of link
1665 * controller specific registers
1666 */
1667 ret = tb_lc_read_uuid(sw, uuid);
1668 if (ret) {
1669 /*
1670 * ICM generates UUID based on UID and fills the upper
1671 * two words with ones. This is not strictly following
1672 * UUID format but we want to be compatible with it so
1673 * we do the same here.
1674 */
1675 uuid[0] = sw->uid & 0xffffffff;
1676 uuid[1] = (sw->uid >> 32) & 0xffffffff;
1677 uuid[2] = 0xffffffff;
1678 uuid[3] = 0xffffffff;
1679 }
1680
1681 sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
1682 if (!sw->uuid)
1683 return -ENOMEM;
1684 return 0;
1685}
1686
1687static int tb_switch_add_dma_port(struct tb_switch *sw)
1688{
1689 u32 status;
1690 int ret;
1691
1692 switch (sw->generation) {
1693 case 3:
1694 break;
1695
1696 case 2:
1697 /* Only root switch can be upgraded */
1698 if (tb_route(sw))
1699 return 0;
1700 break;
1701
1702 default:
1703 /*
1704 * DMA port is the only thing available when the switch
1705 * is in safe mode.
1706 */
1707 if (!sw->safe_mode)
1708 return 0;
1709 break;
1710 }
1711
1712 /* Root switch DMA port requires running firmware */
1713 if (!tb_route(sw) && sw->config.enabled)
1714 return 0;
1715
1716 sw->dma_port = dma_port_alloc(sw);
1717 if (!sw->dma_port)
1718 return 0;
1719
1720 if (sw->no_nvm_upgrade)
1721 return 0;
1722
1723 /*
1724 * Check status of the previous flash authentication. If there
1725 * is one we need to power cycle the switch in any case to make
1726 * it functional again.
1727 */
1728 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
1729 if (ret <= 0)
1730 return ret;
1731
1732 /* Now we can allow root port to suspend again */
1733 if (!tb_route(sw))
1734 nvm_authenticate_complete(sw);
1735
1736 if (status) {
1737 tb_sw_info(sw, "switch flash authentication failed\n");
1738 ret = tb_switch_set_uuid(sw);
1739 if (ret)
1740 return ret;
1741 nvm_set_auth_status(sw, status);
1742 }
1743
1744 tb_sw_info(sw, "power cycling the switch now\n");
1745 dma_port_power_cycle(sw->dma_port);
1746
1747 /*
1748 * We return error here which causes the switch adding failure.
1749 * It should appear back after power cycle is complete.
1750 */
1751 return -ESHUTDOWN;
1752}
1753
1754/**
1755 * tb_switch_add() - Add a switch to the domain
1756 * @sw: Switch to add
1757 *
1758 * This is the last step in adding switch to the domain. It will read
1759 * identification information from DROM and initializes ports so that
1760 * they can be used to connect other switches. The switch will be
1761 * exposed to the userspace when this function successfully returns. To
1762 * remove and release the switch, call tb_switch_remove().
1763 *
1764 * Return: %0 in case of success and negative errno in case of failure
1765 */
1766int tb_switch_add(struct tb_switch *sw)
1767{
1768 int i, ret;
1769
1770 /*
1771 * Initialize DMA control port now before we read DROM. Recent
1772 * host controllers have more complete DROM on NVM that includes
1773 * vendor and model identification strings which we then expose
1774 * to the userspace. NVM can be accessed through DMA
1775 * configuration based mailbox.
1776 */
1777 ret = tb_switch_add_dma_port(sw);
1778 if (ret)
1779 return ret;
1780
1781 if (!sw->safe_mode) {
1782 /* read drom */
1783 ret = tb_drom_read(sw);
1784 if (ret) {
1785 tb_sw_warn(sw, "tb_eeprom_read_rom failed\n");
1786 return ret;
1787 }
1788 tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
1789
1790 ret = tb_switch_set_uuid(sw);
1791 if (ret)
1792 return ret;
1793
1794 for (i = 0; i <= sw->config.max_port_number; i++) {
1795 if (sw->ports[i].disabled) {
1796 tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
1797 continue;
1798 }
1799 ret = tb_init_port(&sw->ports[i]);
1800 if (ret)
1801 return ret;
1802 }
1803 }
1804
1805 ret = device_add(&sw->dev);
1806 if (ret)
1807 return ret;
1808
1809 if (tb_route(sw)) {
1810 dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
1811 sw->vendor, sw->device);
1812 if (sw->vendor_name && sw->device_name)
1813 dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
1814 sw->device_name);
1815 }
1816
1817 ret = tb_switch_nvm_add(sw);
1818 if (ret) {
1819 device_del(&sw->dev);
1820 return ret;
1821 }
1822
1823 pm_runtime_set_active(&sw->dev);
1824 if (sw->rpm) {
1825 pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
1826 pm_runtime_use_autosuspend(&sw->dev);
1827 pm_runtime_mark_last_busy(&sw->dev);
1828 pm_runtime_enable(&sw->dev);
1829 pm_request_autosuspend(&sw->dev);
1830 }
1831
1832 return 0;
1833}
1834
1835/**
1836 * tb_switch_remove() - Remove and release a switch
1837 * @sw: Switch to remove
1838 *
1839 * This will remove the switch from the domain and release it after last
1840 * reference count drops to zero. If there are switches connected below
1841 * this switch, they will be removed as well.
1842 */
1843void tb_switch_remove(struct tb_switch *sw)
1844{
1845 int i;
1846
1847 if (sw->rpm) {
1848 pm_runtime_get_sync(&sw->dev);
1849 pm_runtime_disable(&sw->dev);
1850 }
1851
1852 /* port 0 is the switch itself and never has a remote */
1853 for (i = 1; i <= sw->config.max_port_number; i++) {
1854 if (tb_port_has_remote(&sw->ports[i])) {
1855 tb_switch_remove(sw->ports[i].remote->sw);
1856 sw->ports[i].remote = NULL;
1857 } else if (sw->ports[i].xdomain) {
1858 tb_xdomain_remove(sw->ports[i].xdomain);
1859 sw->ports[i].xdomain = NULL;
1860 }
1861 }
1862
1863 if (!sw->is_unplugged)
1864 tb_plug_events_active(sw, false);
1865 tb_lc_unconfigure_link(sw);
1866
1867 tb_switch_nvm_remove(sw);
1868
1869 if (tb_route(sw))
1870 dev_info(&sw->dev, "device disconnected\n");
1871 device_unregister(&sw->dev);
1872}
1873
1874/**
1875 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
1876 */
1877void tb_sw_set_unplugged(struct tb_switch *sw)
1878{
1879 int i;
1880 if (sw == sw->tb->root_switch) {
1881 tb_sw_WARN(sw, "cannot unplug root switch\n");
1882 return;
1883 }
1884 if (sw->is_unplugged) {
1885 tb_sw_WARN(sw, "is_unplugged already set\n");
1886 return;
1887 }
1888 sw->is_unplugged = true;
1889 for (i = 0; i <= sw->config.max_port_number; i++) {
1890 if (tb_port_has_remote(&sw->ports[i]))
1891 tb_sw_set_unplugged(sw->ports[i].remote->sw);
1892 else if (sw->ports[i].xdomain)
1893 sw->ports[i].xdomain->is_unplugged = true;
1894 }
1895}
1896
1897int tb_switch_resume(struct tb_switch *sw)
1898{
1899 int i, err;
1900 tb_sw_dbg(sw, "resuming switch\n");
1901
1902 /*
1903 * Check for UID of the connected switches except for root
1904 * switch which we assume cannot be removed.
1905 */
1906 if (tb_route(sw)) {
1907 u64 uid;
1908
1909 /*
1910 * Check first that we can still read the switch config
1911 * space. It may be that there is now another domain
1912 * connected.
1913 */
1914 err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
1915 if (err < 0) {
1916 tb_sw_info(sw, "switch not present anymore\n");
1917 return err;
1918 }
1919
1920 err = tb_drom_read_uid_only(sw, &uid);
1921 if (err) {
1922 tb_sw_warn(sw, "uid read failed\n");
1923 return err;
1924 }
1925 if (sw->uid != uid) {
1926 tb_sw_info(sw,
1927 "changed while suspended (uid %#llx -> %#llx)\n",
1928 sw->uid, uid);
1929 return -ENODEV;
1930 }
1931 }
1932
1933 /* upload configuration */
1934 err = tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3);
1935 if (err)
1936 return err;
1937
1938 err = tb_lc_configure_link(sw);
1939 if (err)
1940 return err;
1941
1942 err = tb_plug_events_active(sw, true);
1943 if (err)
1944 return err;
1945
1946 /* check for surviving downstream switches */
1947 for (i = 1; i <= sw->config.max_port_number; i++) {
1948 struct tb_port *port = &sw->ports[i];
1949
1950 if (!tb_port_has_remote(port) && !port->xdomain)
1951 continue;
1952
1953 if (tb_wait_for_port(port, true) <= 0) {
1954 tb_port_warn(port,
1955 "lost during suspend, disconnecting\n");
1956 if (tb_port_has_remote(port))
1957 tb_sw_set_unplugged(port->remote->sw);
1958 else if (port->xdomain)
1959 port->xdomain->is_unplugged = true;
1960 } else if (tb_port_has_remote(port)) {
1961 if (tb_switch_resume(port->remote->sw)) {
1962 tb_port_warn(port,
1963 "lost during suspend, disconnecting\n");
1964 tb_sw_set_unplugged(port->remote->sw);
1965 }
1966 }
1967 }
1968 return 0;
1969}
1970
1971void tb_switch_suspend(struct tb_switch *sw)
1972{
1973 int i, err;
1974 err = tb_plug_events_active(sw, false);
1975 if (err)
1976 return;
1977
1978 for (i = 1; i <= sw->config.max_port_number; i++) {
1979 if (tb_port_has_remote(&sw->ports[i]))
1980 tb_switch_suspend(sw->ports[i].remote->sw);
1981 }
1982
1983 tb_lc_set_sleep(sw);
1984}
1985
1986struct tb_sw_lookup {
1987 struct tb *tb;
1988 u8 link;
1989 u8 depth;
1990 const uuid_t *uuid;
1991 u64 route;
1992};
1993
1994static int tb_switch_match(struct device *dev, const void *data)
1995{
1996 struct tb_switch *sw = tb_to_switch(dev);
1997 const struct tb_sw_lookup *lookup = data;
1998
1999 if (!sw)
2000 return 0;
2001 if (sw->tb != lookup->tb)
2002 return 0;
2003
2004 if (lookup->uuid)
2005 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
2006
2007 if (lookup->route) {
2008 return sw->config.route_lo == lower_32_bits(lookup->route) &&
2009 sw->config.route_hi == upper_32_bits(lookup->route);
2010 }
2011
2012 /* Root switch is matched only by depth */
2013 if (!lookup->depth)
2014 return !sw->depth;
2015
2016 return sw->link == lookup->link && sw->depth == lookup->depth;
2017}
2018
2019/**
2020 * tb_switch_find_by_link_depth() - Find switch by link and depth
2021 * @tb: Domain the switch belongs
2022 * @link: Link number the switch is connected
2023 * @depth: Depth of the switch in link
2024 *
2025 * Returned switch has reference count increased so the caller needs to
2026 * call tb_switch_put() when done with the switch.
2027 */
2028struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
2029{
2030 struct tb_sw_lookup lookup;
2031 struct device *dev;
2032
2033 memset(&lookup, 0, sizeof(lookup));
2034 lookup.tb = tb;
2035 lookup.link = link;
2036 lookup.depth = depth;
2037
2038 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2039 if (dev)
2040 return tb_to_switch(dev);
2041
2042 return NULL;
2043}
2044
2045/**
2046 * tb_switch_find_by_uuid() - Find switch by UUID
2047 * @tb: Domain the switch belongs
2048 * @uuid: UUID to look for
2049 *
2050 * Returned switch has reference count increased so the caller needs to
2051 * call tb_switch_put() when done with the switch.
2052 */
2053struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
2054{
2055 struct tb_sw_lookup lookup;
2056 struct device *dev;
2057
2058 memset(&lookup, 0, sizeof(lookup));
2059 lookup.tb = tb;
2060 lookup.uuid = uuid;
2061
2062 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2063 if (dev)
2064 return tb_to_switch(dev);
2065
2066 return NULL;
2067}
2068
2069/**
2070 * tb_switch_find_by_route() - Find switch by route string
2071 * @tb: Domain the switch belongs
2072 * @route: Route string to look for
2073 *
2074 * Returned switch has reference count increased so the caller needs to
2075 * call tb_switch_put() when done with the switch.
2076 */
2077struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
2078{
2079 struct tb_sw_lookup lookup;
2080 struct device *dev;
2081
2082 if (!route)
2083 return tb_switch_get(tb->root_switch);
2084
2085 memset(&lookup, 0, sizeof(lookup));
2086 lookup.tb = tb;
2087 lookup.route = route;
2088
2089 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2090 if (dev)
2091 return tb_to_switch(dev);
2092
2093 return NULL;
2094}
2095
2096void tb_switch_exit(void)
2097{
2098 ida_destroy(&nvm_ida);
2099}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Thunderbolt driver - switch/port utility functions
4 *
5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
6 * Copyright (C) 2018, Intel Corporation
7 */
8
9#include <linux/delay.h>
10#include <linux/idr.h>
11#include <linux/module.h>
12#include <linux/nvmem-provider.h>
13#include <linux/pm_runtime.h>
14#include <linux/sched/signal.h>
15#include <linux/sizes.h>
16#include <linux/slab.h>
17#include <linux/string_helpers.h>
18
19#include "tb.h"
20
21/* Switch NVM support */
22
23struct nvm_auth_status {
24 struct list_head list;
25 uuid_t uuid;
26 u32 status;
27};
28
29static bool clx_enabled = true;
30module_param_named(clx, clx_enabled, bool, 0444);
31MODULE_PARM_DESC(clx, "allow low power states on the high-speed lanes (default: true)");
32
33/*
34 * Hold NVM authentication failure status per switch This information
35 * needs to stay around even when the switch gets power cycled so we
36 * keep it separately.
37 */
38static LIST_HEAD(nvm_auth_status_cache);
39static DEFINE_MUTEX(nvm_auth_status_lock);
40
41static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw)
42{
43 struct nvm_auth_status *st;
44
45 list_for_each_entry(st, &nvm_auth_status_cache, list) {
46 if (uuid_equal(&st->uuid, sw->uuid))
47 return st;
48 }
49
50 return NULL;
51}
52
53static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status)
54{
55 struct nvm_auth_status *st;
56
57 mutex_lock(&nvm_auth_status_lock);
58 st = __nvm_get_auth_status(sw);
59 mutex_unlock(&nvm_auth_status_lock);
60
61 *status = st ? st->status : 0;
62}
63
64static void nvm_set_auth_status(const struct tb_switch *sw, u32 status)
65{
66 struct nvm_auth_status *st;
67
68 if (WARN_ON(!sw->uuid))
69 return;
70
71 mutex_lock(&nvm_auth_status_lock);
72 st = __nvm_get_auth_status(sw);
73
74 if (!st) {
75 st = kzalloc(sizeof(*st), GFP_KERNEL);
76 if (!st)
77 goto unlock;
78
79 memcpy(&st->uuid, sw->uuid, sizeof(st->uuid));
80 INIT_LIST_HEAD(&st->list);
81 list_add_tail(&st->list, &nvm_auth_status_cache);
82 }
83
84 st->status = status;
85unlock:
86 mutex_unlock(&nvm_auth_status_lock);
87}
88
89static void nvm_clear_auth_status(const struct tb_switch *sw)
90{
91 struct nvm_auth_status *st;
92
93 mutex_lock(&nvm_auth_status_lock);
94 st = __nvm_get_auth_status(sw);
95 if (st) {
96 list_del(&st->list);
97 kfree(st);
98 }
99 mutex_unlock(&nvm_auth_status_lock);
100}
101
102static int nvm_validate_and_write(struct tb_switch *sw)
103{
104 unsigned int image_size;
105 const u8 *buf;
106 int ret;
107
108 ret = tb_nvm_validate(sw->nvm);
109 if (ret)
110 return ret;
111
112 ret = tb_nvm_write_headers(sw->nvm);
113 if (ret)
114 return ret;
115
116 buf = sw->nvm->buf_data_start;
117 image_size = sw->nvm->buf_data_size;
118
119 if (tb_switch_is_usb4(sw))
120 ret = usb4_switch_nvm_write(sw, 0, buf, image_size);
121 else
122 ret = dma_port_flash_write(sw->dma_port, 0, buf, image_size);
123 if (ret)
124 return ret;
125
126 sw->nvm->flushed = true;
127 return 0;
128}
129
130static int nvm_authenticate_host_dma_port(struct tb_switch *sw)
131{
132 int ret = 0;
133
134 /*
135 * Root switch NVM upgrade requires that we disconnect the
136 * existing paths first (in case it is not in safe mode
137 * already).
138 */
139 if (!sw->safe_mode) {
140 u32 status;
141
142 ret = tb_domain_disconnect_all_paths(sw->tb);
143 if (ret)
144 return ret;
145 /*
146 * The host controller goes away pretty soon after this if
147 * everything goes well so getting timeout is expected.
148 */
149 ret = dma_port_flash_update_auth(sw->dma_port);
150 if (!ret || ret == -ETIMEDOUT)
151 return 0;
152
153 /*
154 * Any error from update auth operation requires power
155 * cycling of the host router.
156 */
157 tb_sw_warn(sw, "failed to authenticate NVM, power cycling\n");
158 if (dma_port_flash_update_auth_status(sw->dma_port, &status) > 0)
159 nvm_set_auth_status(sw, status);
160 }
161
162 /*
163 * From safe mode we can get out by just power cycling the
164 * switch.
165 */
166 dma_port_power_cycle(sw->dma_port);
167 return ret;
168}
169
170static int nvm_authenticate_device_dma_port(struct tb_switch *sw)
171{
172 int ret, retries = 10;
173
174 ret = dma_port_flash_update_auth(sw->dma_port);
175 switch (ret) {
176 case 0:
177 case -ETIMEDOUT:
178 case -EACCES:
179 case -EINVAL:
180 /* Power cycle is required */
181 break;
182 default:
183 return ret;
184 }
185
186 /*
187 * Poll here for the authentication status. It takes some time
188 * for the device to respond (we get timeout for a while). Once
189 * we get response the device needs to be power cycled in order
190 * to the new NVM to be taken into use.
191 */
192 do {
193 u32 status;
194
195 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
196 if (ret < 0 && ret != -ETIMEDOUT)
197 return ret;
198 if (ret > 0) {
199 if (status) {
200 tb_sw_warn(sw, "failed to authenticate NVM\n");
201 nvm_set_auth_status(sw, status);
202 }
203
204 tb_sw_info(sw, "power cycling the switch now\n");
205 dma_port_power_cycle(sw->dma_port);
206 return 0;
207 }
208
209 msleep(500);
210 } while (--retries);
211
212 return -ETIMEDOUT;
213}
214
215static void nvm_authenticate_start_dma_port(struct tb_switch *sw)
216{
217 struct pci_dev *root_port;
218
219 /*
220 * During host router NVM upgrade we should not allow root port to
221 * go into D3cold because some root ports cannot trigger PME
222 * itself. To be on the safe side keep the root port in D0 during
223 * the whole upgrade process.
224 */
225 root_port = pcie_find_root_port(sw->tb->nhi->pdev);
226 if (root_port)
227 pm_runtime_get_noresume(&root_port->dev);
228}
229
230static void nvm_authenticate_complete_dma_port(struct tb_switch *sw)
231{
232 struct pci_dev *root_port;
233
234 root_port = pcie_find_root_port(sw->tb->nhi->pdev);
235 if (root_port)
236 pm_runtime_put(&root_port->dev);
237}
238
239static inline bool nvm_readable(struct tb_switch *sw)
240{
241 if (tb_switch_is_usb4(sw)) {
242 /*
243 * USB4 devices must support NVM operations but it is
244 * optional for hosts. Therefore we query the NVM sector
245 * size here and if it is supported assume NVM
246 * operations are implemented.
247 */
248 return usb4_switch_nvm_sector_size(sw) > 0;
249 }
250
251 /* Thunderbolt 2 and 3 devices support NVM through DMA port */
252 return !!sw->dma_port;
253}
254
255static inline bool nvm_upgradeable(struct tb_switch *sw)
256{
257 if (sw->no_nvm_upgrade)
258 return false;
259 return nvm_readable(sw);
260}
261
262static int nvm_authenticate(struct tb_switch *sw, bool auth_only)
263{
264 int ret;
265
266 if (tb_switch_is_usb4(sw)) {
267 if (auth_only) {
268 ret = usb4_switch_nvm_set_offset(sw, 0);
269 if (ret)
270 return ret;
271 }
272 sw->nvm->authenticating = true;
273 return usb4_switch_nvm_authenticate(sw);
274 } else if (auth_only) {
275 return -EOPNOTSUPP;
276 }
277
278 sw->nvm->authenticating = true;
279 if (!tb_route(sw)) {
280 nvm_authenticate_start_dma_port(sw);
281 ret = nvm_authenticate_host_dma_port(sw);
282 } else {
283 ret = nvm_authenticate_device_dma_port(sw);
284 }
285
286 return ret;
287}
288
289/**
290 * tb_switch_nvm_read() - Read router NVM
291 * @sw: Router whose NVM to read
292 * @address: Start address on the NVM
293 * @buf: Buffer where the read data is copied
294 * @size: Size of the buffer in bytes
295 *
296 * Reads from router NVM and returns the requested data in @buf. Locking
297 * is up to the caller. Returns %0 in success and negative errno in case
298 * of failure.
299 */
300int tb_switch_nvm_read(struct tb_switch *sw, unsigned int address, void *buf,
301 size_t size)
302{
303 if (tb_switch_is_usb4(sw))
304 return usb4_switch_nvm_read(sw, address, buf, size);
305 return dma_port_flash_read(sw->dma_port, address, buf, size);
306}
307
308static int nvm_read(void *priv, unsigned int offset, void *val, size_t bytes)
309{
310 struct tb_nvm *nvm = priv;
311 struct tb_switch *sw = tb_to_switch(nvm->dev);
312 int ret;
313
314 pm_runtime_get_sync(&sw->dev);
315
316 if (!mutex_trylock(&sw->tb->lock)) {
317 ret = restart_syscall();
318 goto out;
319 }
320
321 ret = tb_switch_nvm_read(sw, offset, val, bytes);
322 mutex_unlock(&sw->tb->lock);
323
324out:
325 pm_runtime_mark_last_busy(&sw->dev);
326 pm_runtime_put_autosuspend(&sw->dev);
327
328 return ret;
329}
330
331static int nvm_write(void *priv, unsigned int offset, void *val, size_t bytes)
332{
333 struct tb_nvm *nvm = priv;
334 struct tb_switch *sw = tb_to_switch(nvm->dev);
335 int ret;
336
337 if (!mutex_trylock(&sw->tb->lock))
338 return restart_syscall();
339
340 /*
341 * Since writing the NVM image might require some special steps,
342 * for example when CSS headers are written, we cache the image
343 * locally here and handle the special cases when the user asks
344 * us to authenticate the image.
345 */
346 ret = tb_nvm_write_buf(nvm, offset, val, bytes);
347 mutex_unlock(&sw->tb->lock);
348
349 return ret;
350}
351
352static int tb_switch_nvm_add(struct tb_switch *sw)
353{
354 struct tb_nvm *nvm;
355 int ret;
356
357 if (!nvm_readable(sw))
358 return 0;
359
360 nvm = tb_nvm_alloc(&sw->dev);
361 if (IS_ERR(nvm)) {
362 ret = PTR_ERR(nvm) == -EOPNOTSUPP ? 0 : PTR_ERR(nvm);
363 goto err_nvm;
364 }
365
366 ret = tb_nvm_read_version(nvm);
367 if (ret)
368 goto err_nvm;
369
370 /*
371 * If the switch is in safe-mode the only accessible portion of
372 * the NVM is the non-active one where userspace is expected to
373 * write new functional NVM.
374 */
375 if (!sw->safe_mode) {
376 ret = tb_nvm_add_active(nvm, nvm_read);
377 if (ret)
378 goto err_nvm;
379 }
380
381 if (!sw->no_nvm_upgrade) {
382 ret = tb_nvm_add_non_active(nvm, nvm_write);
383 if (ret)
384 goto err_nvm;
385 }
386
387 sw->nvm = nvm;
388 return 0;
389
390err_nvm:
391 tb_sw_dbg(sw, "NVM upgrade disabled\n");
392 sw->no_nvm_upgrade = true;
393 if (!IS_ERR(nvm))
394 tb_nvm_free(nvm);
395
396 return ret;
397}
398
399static void tb_switch_nvm_remove(struct tb_switch *sw)
400{
401 struct tb_nvm *nvm;
402
403 nvm = sw->nvm;
404 sw->nvm = NULL;
405
406 if (!nvm)
407 return;
408
409 /* Remove authentication status in case the switch is unplugged */
410 if (!nvm->authenticating)
411 nvm_clear_auth_status(sw);
412
413 tb_nvm_free(nvm);
414}
415
416/* port utility functions */
417
418static const char *tb_port_type(const struct tb_regs_port_header *port)
419{
420 switch (port->type >> 16) {
421 case 0:
422 switch ((u8) port->type) {
423 case 0:
424 return "Inactive";
425 case 1:
426 return "Port";
427 case 2:
428 return "NHI";
429 default:
430 return "unknown";
431 }
432 case 0x2:
433 return "Ethernet";
434 case 0x8:
435 return "SATA";
436 case 0xe:
437 return "DP/HDMI";
438 case 0x10:
439 return "PCIe";
440 case 0x20:
441 return "USB";
442 default:
443 return "unknown";
444 }
445}
446
447static void tb_dump_port(struct tb *tb, const struct tb_port *port)
448{
449 const struct tb_regs_port_header *regs = &port->config;
450
451 tb_dbg(tb,
452 " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
453 regs->port_number, regs->vendor_id, regs->device_id,
454 regs->revision, regs->thunderbolt_version, tb_port_type(regs),
455 regs->type);
456 tb_dbg(tb, " Max hop id (in/out): %d/%d\n",
457 regs->max_in_hop_id, regs->max_out_hop_id);
458 tb_dbg(tb, " Max counters: %d\n", regs->max_counters);
459 tb_dbg(tb, " NFC Credits: %#x\n", regs->nfc_credits);
460 tb_dbg(tb, " Credits (total/control): %u/%u\n", port->total_credits,
461 port->ctl_credits);
462}
463
464/**
465 * tb_port_state() - get connectedness state of a port
466 * @port: the port to check
467 *
468 * The port must have a TB_CAP_PHY (i.e. it should be a real port).
469 *
470 * Return: Returns an enum tb_port_state on success or an error code on failure.
471 */
472int tb_port_state(struct tb_port *port)
473{
474 struct tb_cap_phy phy;
475 int res;
476 if (port->cap_phy == 0) {
477 tb_port_WARN(port, "does not have a PHY\n");
478 return -EINVAL;
479 }
480 res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
481 if (res)
482 return res;
483 return phy.state;
484}
485
486/**
487 * tb_wait_for_port() - wait for a port to become ready
488 * @port: Port to wait
489 * @wait_if_unplugged: Wait also when port is unplugged
490 *
491 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
492 * wait_if_unplugged is set then we also wait if the port is in state
493 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
494 * switch resume). Otherwise we only wait if a device is registered but the link
495 * has not yet been established.
496 *
497 * Return: Returns an error code on failure. Returns 0 if the port is not
498 * connected or failed to reach state TB_PORT_UP within one second. Returns 1
499 * if the port is connected and in state TB_PORT_UP.
500 */
501int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
502{
503 int retries = 10;
504 int state;
505 if (!port->cap_phy) {
506 tb_port_WARN(port, "does not have PHY\n");
507 return -EINVAL;
508 }
509 if (tb_is_upstream_port(port)) {
510 tb_port_WARN(port, "is the upstream port\n");
511 return -EINVAL;
512 }
513
514 while (retries--) {
515 state = tb_port_state(port);
516 if (state < 0)
517 return state;
518 if (state == TB_PORT_DISABLED) {
519 tb_port_dbg(port, "is disabled (state: 0)\n");
520 return 0;
521 }
522 if (state == TB_PORT_UNPLUGGED) {
523 if (wait_if_unplugged) {
524 /* used during resume */
525 tb_port_dbg(port,
526 "is unplugged (state: 7), retrying...\n");
527 msleep(100);
528 continue;
529 }
530 tb_port_dbg(port, "is unplugged (state: 7)\n");
531 return 0;
532 }
533 if (state == TB_PORT_UP) {
534 tb_port_dbg(port, "is connected, link is up (state: 2)\n");
535 return 1;
536 }
537
538 /*
539 * After plug-in the state is TB_PORT_CONNECTING. Give it some
540 * time.
541 */
542 tb_port_dbg(port,
543 "is connected, link is not up (state: %d), retrying...\n",
544 state);
545 msleep(100);
546 }
547 tb_port_warn(port,
548 "failed to reach state TB_PORT_UP. Ignoring port...\n");
549 return 0;
550}
551
552/**
553 * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
554 * @port: Port to add/remove NFC credits
555 * @credits: Credits to add/remove
556 *
557 * Change the number of NFC credits allocated to @port by @credits. To remove
558 * NFC credits pass a negative amount of credits.
559 *
560 * Return: Returns 0 on success or an error code on failure.
561 */
562int tb_port_add_nfc_credits(struct tb_port *port, int credits)
563{
564 u32 nfc_credits;
565
566 if (credits == 0 || port->sw->is_unplugged)
567 return 0;
568
569 /*
570 * USB4 restricts programming NFC buffers to lane adapters only
571 * so skip other ports.
572 */
573 if (tb_switch_is_usb4(port->sw) && !tb_port_is_null(port))
574 return 0;
575
576 nfc_credits = port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK;
577 if (credits < 0)
578 credits = max_t(int, -nfc_credits, credits);
579
580 nfc_credits += credits;
581
582 tb_port_dbg(port, "adding %d NFC credits to %lu", credits,
583 port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK);
584
585 port->config.nfc_credits &= ~ADP_CS_4_NFC_BUFFERS_MASK;
586 port->config.nfc_credits |= nfc_credits;
587
588 return tb_port_write(port, &port->config.nfc_credits,
589 TB_CFG_PORT, ADP_CS_4, 1);
590}
591
592/**
593 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
594 * @port: Port whose counters to clear
595 * @counter: Counter index to clear
596 *
597 * Return: Returns 0 on success or an error code on failure.
598 */
599int tb_port_clear_counter(struct tb_port *port, int counter)
600{
601 u32 zero[3] = { 0, 0, 0 };
602 tb_port_dbg(port, "clearing counter %d\n", counter);
603 return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
604}
605
606/**
607 * tb_port_unlock() - Unlock downstream port
608 * @port: Port to unlock
609 *
610 * Needed for USB4 but can be called for any CIO/USB4 ports. Makes the
611 * downstream router accessible for CM.
612 */
613int tb_port_unlock(struct tb_port *port)
614{
615 if (tb_switch_is_icm(port->sw))
616 return 0;
617 if (!tb_port_is_null(port))
618 return -EINVAL;
619 if (tb_switch_is_usb4(port->sw))
620 return usb4_port_unlock(port);
621 return 0;
622}
623
624static int __tb_port_enable(struct tb_port *port, bool enable)
625{
626 int ret;
627 u32 phy;
628
629 if (!tb_port_is_null(port))
630 return -EINVAL;
631
632 ret = tb_port_read(port, &phy, TB_CFG_PORT,
633 port->cap_phy + LANE_ADP_CS_1, 1);
634 if (ret)
635 return ret;
636
637 if (enable)
638 phy &= ~LANE_ADP_CS_1_LD;
639 else
640 phy |= LANE_ADP_CS_1_LD;
641
642
643 ret = tb_port_write(port, &phy, TB_CFG_PORT,
644 port->cap_phy + LANE_ADP_CS_1, 1);
645 if (ret)
646 return ret;
647
648 tb_port_dbg(port, "lane %s\n", str_enabled_disabled(enable));
649 return 0;
650}
651
652/**
653 * tb_port_enable() - Enable lane adapter
654 * @port: Port to enable (can be %NULL)
655 *
656 * This is used for lane 0 and 1 adapters to enable it.
657 */
658int tb_port_enable(struct tb_port *port)
659{
660 return __tb_port_enable(port, true);
661}
662
663/**
664 * tb_port_disable() - Disable lane adapter
665 * @port: Port to disable (can be %NULL)
666 *
667 * This is used for lane 0 and 1 adapters to disable it.
668 */
669int tb_port_disable(struct tb_port *port)
670{
671 return __tb_port_enable(port, false);
672}
673
674/*
675 * tb_init_port() - initialize a port
676 *
677 * This is a helper method for tb_switch_alloc. Does not check or initialize
678 * any downstream switches.
679 *
680 * Return: Returns 0 on success or an error code on failure.
681 */
682static int tb_init_port(struct tb_port *port)
683{
684 int res;
685 int cap;
686
687 INIT_LIST_HEAD(&port->list);
688
689 /* Control adapter does not have configuration space */
690 if (!port->port)
691 return 0;
692
693 res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
694 if (res) {
695 if (res == -ENODEV) {
696 tb_dbg(port->sw->tb, " Port %d: not implemented\n",
697 port->port);
698 port->disabled = true;
699 return 0;
700 }
701 return res;
702 }
703
704 /* Port 0 is the switch itself and has no PHY. */
705 if (port->config.type == TB_TYPE_PORT) {
706 cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
707
708 if (cap > 0)
709 port->cap_phy = cap;
710 else
711 tb_port_WARN(port, "non switch port without a PHY\n");
712
713 cap = tb_port_find_cap(port, TB_PORT_CAP_USB4);
714 if (cap > 0)
715 port->cap_usb4 = cap;
716
717 /*
718 * USB4 ports the buffers allocated for the control path
719 * can be read from the path config space. Legacy
720 * devices we use hard-coded value.
721 */
722 if (tb_switch_is_usb4(port->sw)) {
723 struct tb_regs_hop hop;
724
725 if (!tb_port_read(port, &hop, TB_CFG_HOPS, 0, 2))
726 port->ctl_credits = hop.initial_credits;
727 }
728 if (!port->ctl_credits)
729 port->ctl_credits = 2;
730
731 } else {
732 cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
733 if (cap > 0)
734 port->cap_adap = cap;
735 }
736
737 port->total_credits =
738 (port->config.nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
739 ADP_CS_4_TOTAL_BUFFERS_SHIFT;
740
741 tb_dump_port(port->sw->tb, port);
742 return 0;
743}
744
745static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,
746 int max_hopid)
747{
748 int port_max_hopid;
749 struct ida *ida;
750
751 if (in) {
752 port_max_hopid = port->config.max_in_hop_id;
753 ida = &port->in_hopids;
754 } else {
755 port_max_hopid = port->config.max_out_hop_id;
756 ida = &port->out_hopids;
757 }
758
759 /*
760 * NHI can use HopIDs 1-max for other adapters HopIDs 0-7 are
761 * reserved.
762 */
763 if (!tb_port_is_nhi(port) && min_hopid < TB_PATH_MIN_HOPID)
764 min_hopid = TB_PATH_MIN_HOPID;
765
766 if (max_hopid < 0 || max_hopid > port_max_hopid)
767 max_hopid = port_max_hopid;
768
769 return ida_simple_get(ida, min_hopid, max_hopid + 1, GFP_KERNEL);
770}
771
772/**
773 * tb_port_alloc_in_hopid() - Allocate input HopID from port
774 * @port: Port to allocate HopID for
775 * @min_hopid: Minimum acceptable input HopID
776 * @max_hopid: Maximum acceptable input HopID
777 *
778 * Return: HopID between @min_hopid and @max_hopid or negative errno in
779 * case of error.
780 */
781int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)
782{
783 return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);
784}
785
786/**
787 * tb_port_alloc_out_hopid() - Allocate output HopID from port
788 * @port: Port to allocate HopID for
789 * @min_hopid: Minimum acceptable output HopID
790 * @max_hopid: Maximum acceptable output HopID
791 *
792 * Return: HopID between @min_hopid and @max_hopid or negative errno in
793 * case of error.
794 */
795int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)
796{
797 return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);
798}
799
800/**
801 * tb_port_release_in_hopid() - Release allocated input HopID from port
802 * @port: Port whose HopID to release
803 * @hopid: HopID to release
804 */
805void tb_port_release_in_hopid(struct tb_port *port, int hopid)
806{
807 ida_simple_remove(&port->in_hopids, hopid);
808}
809
810/**
811 * tb_port_release_out_hopid() - Release allocated output HopID from port
812 * @port: Port whose HopID to release
813 * @hopid: HopID to release
814 */
815void tb_port_release_out_hopid(struct tb_port *port, int hopid)
816{
817 ida_simple_remove(&port->out_hopids, hopid);
818}
819
820static inline bool tb_switch_is_reachable(const struct tb_switch *parent,
821 const struct tb_switch *sw)
822{
823 u64 mask = (1ULL << parent->config.depth * 8) - 1;
824 return (tb_route(parent) & mask) == (tb_route(sw) & mask);
825}
826
827/**
828 * tb_next_port_on_path() - Return next port for given port on a path
829 * @start: Start port of the walk
830 * @end: End port of the walk
831 * @prev: Previous port (%NULL if this is the first)
832 *
833 * This function can be used to walk from one port to another if they
834 * are connected through zero or more switches. If the @prev is dual
835 * link port, the function follows that link and returns another end on
836 * that same link.
837 *
838 * If the @end port has been reached, return %NULL.
839 *
840 * Domain tb->lock must be held when this function is called.
841 */
842struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
843 struct tb_port *prev)
844{
845 struct tb_port *next;
846
847 if (!prev)
848 return start;
849
850 if (prev->sw == end->sw) {
851 if (prev == end)
852 return NULL;
853 return end;
854 }
855
856 if (tb_switch_is_reachable(prev->sw, end->sw)) {
857 next = tb_port_at(tb_route(end->sw), prev->sw);
858 /* Walk down the topology if next == prev */
859 if (prev->remote &&
860 (next == prev || next->dual_link_port == prev))
861 next = prev->remote;
862 } else {
863 if (tb_is_upstream_port(prev)) {
864 next = prev->remote;
865 } else {
866 next = tb_upstream_port(prev->sw);
867 /*
868 * Keep the same link if prev and next are both
869 * dual link ports.
870 */
871 if (next->dual_link_port &&
872 next->link_nr != prev->link_nr) {
873 next = next->dual_link_port;
874 }
875 }
876 }
877
878 return next != prev ? next : NULL;
879}
880
881/**
882 * tb_port_get_link_speed() - Get current link speed
883 * @port: Port to check (USB4 or CIO)
884 *
885 * Returns link speed in Gb/s or negative errno in case of failure.
886 */
887int tb_port_get_link_speed(struct tb_port *port)
888{
889 u32 val, speed;
890 int ret;
891
892 if (!port->cap_phy)
893 return -EINVAL;
894
895 ret = tb_port_read(port, &val, TB_CFG_PORT,
896 port->cap_phy + LANE_ADP_CS_1, 1);
897 if (ret)
898 return ret;
899
900 speed = (val & LANE_ADP_CS_1_CURRENT_SPEED_MASK) >>
901 LANE_ADP_CS_1_CURRENT_SPEED_SHIFT;
902 return speed == LANE_ADP_CS_1_CURRENT_SPEED_GEN3 ? 20 : 10;
903}
904
905/**
906 * tb_port_get_link_width() - Get current link width
907 * @port: Port to check (USB4 or CIO)
908 *
909 * Returns link width. Return values can be 1 (Single-Lane), 2 (Dual-Lane)
910 * or negative errno in case of failure.
911 */
912int tb_port_get_link_width(struct tb_port *port)
913{
914 u32 val;
915 int ret;
916
917 if (!port->cap_phy)
918 return -EINVAL;
919
920 ret = tb_port_read(port, &val, TB_CFG_PORT,
921 port->cap_phy + LANE_ADP_CS_1, 1);
922 if (ret)
923 return ret;
924
925 return (val & LANE_ADP_CS_1_CURRENT_WIDTH_MASK) >>
926 LANE_ADP_CS_1_CURRENT_WIDTH_SHIFT;
927}
928
929static bool tb_port_is_width_supported(struct tb_port *port, int width)
930{
931 u32 phy, widths;
932 int ret;
933
934 if (!port->cap_phy)
935 return false;
936
937 ret = tb_port_read(port, &phy, TB_CFG_PORT,
938 port->cap_phy + LANE_ADP_CS_0, 1);
939 if (ret)
940 return false;
941
942 widths = (phy & LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK) >>
943 LANE_ADP_CS_0_SUPPORTED_WIDTH_SHIFT;
944
945 return !!(widths & width);
946}
947
948/**
949 * tb_port_set_link_width() - Set target link width of the lane adapter
950 * @port: Lane adapter
951 * @width: Target link width (%1 or %2)
952 *
953 * Sets the target link width of the lane adapter to @width. Does not
954 * enable/disable lane bonding. For that call tb_port_set_lane_bonding().
955 *
956 * Return: %0 in case of success and negative errno in case of error
957 */
958int tb_port_set_link_width(struct tb_port *port, unsigned int width)
959{
960 u32 val;
961 int ret;
962
963 if (!port->cap_phy)
964 return -EINVAL;
965
966 ret = tb_port_read(port, &val, TB_CFG_PORT,
967 port->cap_phy + LANE_ADP_CS_1, 1);
968 if (ret)
969 return ret;
970
971 val &= ~LANE_ADP_CS_1_TARGET_WIDTH_MASK;
972 switch (width) {
973 case 1:
974 val |= LANE_ADP_CS_1_TARGET_WIDTH_SINGLE <<
975 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
976 break;
977 case 2:
978 val |= LANE_ADP_CS_1_TARGET_WIDTH_DUAL <<
979 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
980 break;
981 default:
982 return -EINVAL;
983 }
984
985 return tb_port_write(port, &val, TB_CFG_PORT,
986 port->cap_phy + LANE_ADP_CS_1, 1);
987}
988
989/**
990 * tb_port_set_lane_bonding() - Enable/disable lane bonding
991 * @port: Lane adapter
992 * @bonding: enable/disable bonding
993 *
994 * Enables or disables lane bonding. This should be called after target
995 * link width has been set (tb_port_set_link_width()). Note in most
996 * cases one should use tb_port_lane_bonding_enable() instead to enable
997 * lane bonding.
998 *
999 * As a side effect sets @port->bonding accordingly (and does the same
1000 * for lane 1 too).
1001 *
1002 * Return: %0 in case of success and negative errno in case of error
1003 */
1004int tb_port_set_lane_bonding(struct tb_port *port, bool bonding)
1005{
1006 u32 val;
1007 int ret;
1008
1009 if (!port->cap_phy)
1010 return -EINVAL;
1011
1012 ret = tb_port_read(port, &val, TB_CFG_PORT,
1013 port->cap_phy + LANE_ADP_CS_1, 1);
1014 if (ret)
1015 return ret;
1016
1017 if (bonding)
1018 val |= LANE_ADP_CS_1_LB;
1019 else
1020 val &= ~LANE_ADP_CS_1_LB;
1021
1022 ret = tb_port_write(port, &val, TB_CFG_PORT,
1023 port->cap_phy + LANE_ADP_CS_1, 1);
1024 if (ret)
1025 return ret;
1026
1027 /*
1028 * When lane 0 bonding is set it will affect lane 1 too so
1029 * update both.
1030 */
1031 port->bonded = bonding;
1032 port->dual_link_port->bonded = bonding;
1033
1034 return 0;
1035}
1036
1037/**
1038 * tb_port_lane_bonding_enable() - Enable bonding on port
1039 * @port: port to enable
1040 *
1041 * Enable bonding by setting the link width of the port and the other
1042 * port in case of dual link port. Does not wait for the link to
1043 * actually reach the bonded state so caller needs to call
1044 * tb_port_wait_for_link_width() before enabling any paths through the
1045 * link to make sure the link is in expected state.
1046 *
1047 * Return: %0 in case of success and negative errno in case of error
1048 */
1049int tb_port_lane_bonding_enable(struct tb_port *port)
1050{
1051 int ret;
1052
1053 /*
1054 * Enable lane bonding for both links if not already enabled by
1055 * for example the boot firmware.
1056 */
1057 ret = tb_port_get_link_width(port);
1058 if (ret == 1) {
1059 ret = tb_port_set_link_width(port, 2);
1060 if (ret)
1061 goto err_lane0;
1062 }
1063
1064 ret = tb_port_get_link_width(port->dual_link_port);
1065 if (ret == 1) {
1066 ret = tb_port_set_link_width(port->dual_link_port, 2);
1067 if (ret)
1068 goto err_lane0;
1069 }
1070
1071 ret = tb_port_set_lane_bonding(port, true);
1072 if (ret)
1073 goto err_lane1;
1074
1075 return 0;
1076
1077err_lane1:
1078 tb_port_set_link_width(port->dual_link_port, 1);
1079err_lane0:
1080 tb_port_set_link_width(port, 1);
1081 return ret;
1082}
1083
1084/**
1085 * tb_port_lane_bonding_disable() - Disable bonding on port
1086 * @port: port to disable
1087 *
1088 * Disable bonding by setting the link width of the port and the
1089 * other port in case of dual link port.
1090 */
1091void tb_port_lane_bonding_disable(struct tb_port *port)
1092{
1093 tb_port_set_lane_bonding(port, false);
1094 tb_port_set_link_width(port->dual_link_port, 1);
1095 tb_port_set_link_width(port, 1);
1096}
1097
1098/**
1099 * tb_port_wait_for_link_width() - Wait until link reaches specific width
1100 * @port: Port to wait for
1101 * @width: Expected link width (%1 or %2)
1102 * @timeout_msec: Timeout in ms how long to wait
1103 *
1104 * Should be used after both ends of the link have been bonded (or
1105 * bonding has been disabled) to wait until the link actually reaches
1106 * the expected state. Returns %-ETIMEDOUT if the @width was not reached
1107 * within the given timeout, %0 if it did.
1108 */
1109int tb_port_wait_for_link_width(struct tb_port *port, int width,
1110 int timeout_msec)
1111{
1112 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
1113 int ret;
1114
1115 do {
1116 ret = tb_port_get_link_width(port);
1117 if (ret < 0) {
1118 /*
1119 * Sometimes we get port locked error when
1120 * polling the lanes so we can ignore it and
1121 * retry.
1122 */
1123 if (ret != -EACCES)
1124 return ret;
1125 } else if (ret == width) {
1126 return 0;
1127 }
1128
1129 usleep_range(1000, 2000);
1130 } while (ktime_before(ktime_get(), timeout));
1131
1132 return -ETIMEDOUT;
1133}
1134
1135static int tb_port_do_update_credits(struct tb_port *port)
1136{
1137 u32 nfc_credits;
1138 int ret;
1139
1140 ret = tb_port_read(port, &nfc_credits, TB_CFG_PORT, ADP_CS_4, 1);
1141 if (ret)
1142 return ret;
1143
1144 if (nfc_credits != port->config.nfc_credits) {
1145 u32 total;
1146
1147 total = (nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
1148 ADP_CS_4_TOTAL_BUFFERS_SHIFT;
1149
1150 tb_port_dbg(port, "total credits changed %u -> %u\n",
1151 port->total_credits, total);
1152
1153 port->config.nfc_credits = nfc_credits;
1154 port->total_credits = total;
1155 }
1156
1157 return 0;
1158}
1159
1160/**
1161 * tb_port_update_credits() - Re-read port total credits
1162 * @port: Port to update
1163 *
1164 * After the link is bonded (or bonding was disabled) the port total
1165 * credits may change, so this function needs to be called to re-read
1166 * the credits. Updates also the second lane adapter.
1167 */
1168int tb_port_update_credits(struct tb_port *port)
1169{
1170 int ret;
1171
1172 ret = tb_port_do_update_credits(port);
1173 if (ret)
1174 return ret;
1175 return tb_port_do_update_credits(port->dual_link_port);
1176}
1177
1178static int __tb_port_pm_secondary_set(struct tb_port *port, bool secondary)
1179{
1180 u32 phy;
1181 int ret;
1182
1183 ret = tb_port_read(port, &phy, TB_CFG_PORT,
1184 port->cap_phy + LANE_ADP_CS_1, 1);
1185 if (ret)
1186 return ret;
1187
1188 if (secondary)
1189 phy |= LANE_ADP_CS_1_PMS;
1190 else
1191 phy &= ~LANE_ADP_CS_1_PMS;
1192
1193 return tb_port_write(port, &phy, TB_CFG_PORT,
1194 port->cap_phy + LANE_ADP_CS_1, 1);
1195}
1196
1197static int tb_port_pm_secondary_enable(struct tb_port *port)
1198{
1199 return __tb_port_pm_secondary_set(port, true);
1200}
1201
1202static int tb_port_pm_secondary_disable(struct tb_port *port)
1203{
1204 return __tb_port_pm_secondary_set(port, false);
1205}
1206
1207/* Called for USB4 or Titan Ridge routers only */
1208static bool tb_port_clx_supported(struct tb_port *port, unsigned int clx_mask)
1209{
1210 u32 val, mask = 0;
1211 bool ret;
1212
1213 /* Don't enable CLx in case of two single-lane links */
1214 if (!port->bonded && port->dual_link_port)
1215 return false;
1216
1217 /* Don't enable CLx in case of inter-domain link */
1218 if (port->xdomain)
1219 return false;
1220
1221 if (tb_switch_is_usb4(port->sw)) {
1222 if (!usb4_port_clx_supported(port))
1223 return false;
1224 } else if (!tb_lc_is_clx_supported(port)) {
1225 return false;
1226 }
1227
1228 if (clx_mask & TB_CL1) {
1229 /* CL0s and CL1 are enabled and supported together */
1230 mask |= LANE_ADP_CS_0_CL0S_SUPPORT | LANE_ADP_CS_0_CL1_SUPPORT;
1231 }
1232 if (clx_mask & TB_CL2)
1233 mask |= LANE_ADP_CS_0_CL2_SUPPORT;
1234
1235 ret = tb_port_read(port, &val, TB_CFG_PORT,
1236 port->cap_phy + LANE_ADP_CS_0, 1);
1237 if (ret)
1238 return false;
1239
1240 return !!(val & mask);
1241}
1242
1243static int __tb_port_clx_set(struct tb_port *port, enum tb_clx clx, bool enable)
1244{
1245 u32 phy, mask;
1246 int ret;
1247
1248 /* CL0s and CL1 are enabled and supported together */
1249 if (clx == TB_CL1)
1250 mask = LANE_ADP_CS_1_CL0S_ENABLE | LANE_ADP_CS_1_CL1_ENABLE;
1251 else
1252 /* For now we support only CL0s and CL1. Not CL2 */
1253 return -EOPNOTSUPP;
1254
1255 ret = tb_port_read(port, &phy, TB_CFG_PORT,
1256 port->cap_phy + LANE_ADP_CS_1, 1);
1257 if (ret)
1258 return ret;
1259
1260 if (enable)
1261 phy |= mask;
1262 else
1263 phy &= ~mask;
1264
1265 return tb_port_write(port, &phy, TB_CFG_PORT,
1266 port->cap_phy + LANE_ADP_CS_1, 1);
1267}
1268
1269static int tb_port_clx_disable(struct tb_port *port, enum tb_clx clx)
1270{
1271 return __tb_port_clx_set(port, clx, false);
1272}
1273
1274static int tb_port_clx_enable(struct tb_port *port, enum tb_clx clx)
1275{
1276 return __tb_port_clx_set(port, clx, true);
1277}
1278
1279/**
1280 * tb_port_is_clx_enabled() - Is given CL state enabled
1281 * @port: USB4 port to check
1282 * @clx_mask: Mask of CL states to check
1283 *
1284 * Returns true if any of the given CL states is enabled for @port.
1285 */
1286bool tb_port_is_clx_enabled(struct tb_port *port, unsigned int clx_mask)
1287{
1288 u32 val, mask = 0;
1289 int ret;
1290
1291 if (!tb_port_clx_supported(port, clx_mask))
1292 return false;
1293
1294 if (clx_mask & TB_CL1)
1295 mask |= LANE_ADP_CS_1_CL0S_ENABLE | LANE_ADP_CS_1_CL1_ENABLE;
1296 if (clx_mask & TB_CL2)
1297 mask |= LANE_ADP_CS_1_CL2_ENABLE;
1298
1299 ret = tb_port_read(port, &val, TB_CFG_PORT,
1300 port->cap_phy + LANE_ADP_CS_1, 1);
1301 if (ret)
1302 return false;
1303
1304 return !!(val & mask);
1305}
1306
1307static int tb_port_start_lane_initialization(struct tb_port *port)
1308{
1309 int ret;
1310
1311 if (tb_switch_is_usb4(port->sw))
1312 return 0;
1313
1314 ret = tb_lc_start_lane_initialization(port);
1315 return ret == -EINVAL ? 0 : ret;
1316}
1317
1318/*
1319 * Returns true if the port had something (router, XDomain) connected
1320 * before suspend.
1321 */
1322static bool tb_port_resume(struct tb_port *port)
1323{
1324 bool has_remote = tb_port_has_remote(port);
1325
1326 if (port->usb4) {
1327 usb4_port_device_resume(port->usb4);
1328 } else if (!has_remote) {
1329 /*
1330 * For disconnected downstream lane adapters start lane
1331 * initialization now so we detect future connects.
1332 *
1333 * For XDomain start the lane initialzation now so the
1334 * link gets re-established.
1335 *
1336 * This is only needed for non-USB4 ports.
1337 */
1338 if (!tb_is_upstream_port(port) || port->xdomain)
1339 tb_port_start_lane_initialization(port);
1340 }
1341
1342 return has_remote || port->xdomain;
1343}
1344
1345/**
1346 * tb_port_is_enabled() - Is the adapter port enabled
1347 * @port: Port to check
1348 */
1349bool tb_port_is_enabled(struct tb_port *port)
1350{
1351 switch (port->config.type) {
1352 case TB_TYPE_PCIE_UP:
1353 case TB_TYPE_PCIE_DOWN:
1354 return tb_pci_port_is_enabled(port);
1355
1356 case TB_TYPE_DP_HDMI_IN:
1357 case TB_TYPE_DP_HDMI_OUT:
1358 return tb_dp_port_is_enabled(port);
1359
1360 case TB_TYPE_USB3_UP:
1361 case TB_TYPE_USB3_DOWN:
1362 return tb_usb3_port_is_enabled(port);
1363
1364 default:
1365 return false;
1366 }
1367}
1368
1369/**
1370 * tb_usb3_port_is_enabled() - Is the USB3 adapter port enabled
1371 * @port: USB3 adapter port to check
1372 */
1373bool tb_usb3_port_is_enabled(struct tb_port *port)
1374{
1375 u32 data;
1376
1377 if (tb_port_read(port, &data, TB_CFG_PORT,
1378 port->cap_adap + ADP_USB3_CS_0, 1))
1379 return false;
1380
1381 return !!(data & ADP_USB3_CS_0_PE);
1382}
1383
1384/**
1385 * tb_usb3_port_enable() - Enable USB3 adapter port
1386 * @port: USB3 adapter port to enable
1387 * @enable: Enable/disable the USB3 adapter
1388 */
1389int tb_usb3_port_enable(struct tb_port *port, bool enable)
1390{
1391 u32 word = enable ? (ADP_USB3_CS_0_PE | ADP_USB3_CS_0_V)
1392 : ADP_USB3_CS_0_V;
1393
1394 if (!port->cap_adap)
1395 return -ENXIO;
1396 return tb_port_write(port, &word, TB_CFG_PORT,
1397 port->cap_adap + ADP_USB3_CS_0, 1);
1398}
1399
1400/**
1401 * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
1402 * @port: PCIe port to check
1403 */
1404bool tb_pci_port_is_enabled(struct tb_port *port)
1405{
1406 u32 data;
1407
1408 if (tb_port_read(port, &data, TB_CFG_PORT,
1409 port->cap_adap + ADP_PCIE_CS_0, 1))
1410 return false;
1411
1412 return !!(data & ADP_PCIE_CS_0_PE);
1413}
1414
1415/**
1416 * tb_pci_port_enable() - Enable PCIe adapter port
1417 * @port: PCIe port to enable
1418 * @enable: Enable/disable the PCIe adapter
1419 */
1420int tb_pci_port_enable(struct tb_port *port, bool enable)
1421{
1422 u32 word = enable ? ADP_PCIE_CS_0_PE : 0x0;
1423 if (!port->cap_adap)
1424 return -ENXIO;
1425 return tb_port_write(port, &word, TB_CFG_PORT,
1426 port->cap_adap + ADP_PCIE_CS_0, 1);
1427}
1428
1429/**
1430 * tb_dp_port_hpd_is_active() - Is HPD already active
1431 * @port: DP out port to check
1432 *
1433 * Checks if the DP OUT adapter port has HDP bit already set.
1434 */
1435int tb_dp_port_hpd_is_active(struct tb_port *port)
1436{
1437 u32 data;
1438 int ret;
1439
1440 ret = tb_port_read(port, &data, TB_CFG_PORT,
1441 port->cap_adap + ADP_DP_CS_2, 1);
1442 if (ret)
1443 return ret;
1444
1445 return !!(data & ADP_DP_CS_2_HDP);
1446}
1447
1448/**
1449 * tb_dp_port_hpd_clear() - Clear HPD from DP IN port
1450 * @port: Port to clear HPD
1451 *
1452 * If the DP IN port has HDP set, this function can be used to clear it.
1453 */
1454int tb_dp_port_hpd_clear(struct tb_port *port)
1455{
1456 u32 data;
1457 int ret;
1458
1459 ret = tb_port_read(port, &data, TB_CFG_PORT,
1460 port->cap_adap + ADP_DP_CS_3, 1);
1461 if (ret)
1462 return ret;
1463
1464 data |= ADP_DP_CS_3_HDPC;
1465 return tb_port_write(port, &data, TB_CFG_PORT,
1466 port->cap_adap + ADP_DP_CS_3, 1);
1467}
1468
1469/**
1470 * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
1471 * @port: DP IN/OUT port to set hops
1472 * @video: Video Hop ID
1473 * @aux_tx: AUX TX Hop ID
1474 * @aux_rx: AUX RX Hop ID
1475 *
1476 * Programs specified Hop IDs for DP IN/OUT port. Can be called for USB4
1477 * router DP adapters too but does not program the values as the fields
1478 * are read-only.
1479 */
1480int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
1481 unsigned int aux_tx, unsigned int aux_rx)
1482{
1483 u32 data[2];
1484 int ret;
1485
1486 if (tb_switch_is_usb4(port->sw))
1487 return 0;
1488
1489 ret = tb_port_read(port, data, TB_CFG_PORT,
1490 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1491 if (ret)
1492 return ret;
1493
1494 data[0] &= ~ADP_DP_CS_0_VIDEO_HOPID_MASK;
1495 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1496 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1497
1498 data[0] |= (video << ADP_DP_CS_0_VIDEO_HOPID_SHIFT) &
1499 ADP_DP_CS_0_VIDEO_HOPID_MASK;
1500 data[1] |= aux_tx & ADP_DP_CS_1_AUX_TX_HOPID_MASK;
1501 data[1] |= (aux_rx << ADP_DP_CS_1_AUX_RX_HOPID_SHIFT) &
1502 ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1503
1504 return tb_port_write(port, data, TB_CFG_PORT,
1505 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1506}
1507
1508/**
1509 * tb_dp_port_is_enabled() - Is DP adapter port enabled
1510 * @port: DP adapter port to check
1511 */
1512bool tb_dp_port_is_enabled(struct tb_port *port)
1513{
1514 u32 data[2];
1515
1516 if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap + ADP_DP_CS_0,
1517 ARRAY_SIZE(data)))
1518 return false;
1519
1520 return !!(data[0] & (ADP_DP_CS_0_VE | ADP_DP_CS_0_AE));
1521}
1522
1523/**
1524 * tb_dp_port_enable() - Enables/disables DP paths of a port
1525 * @port: DP IN/OUT port
1526 * @enable: Enable/disable DP path
1527 *
1528 * Once Hop IDs are programmed DP paths can be enabled or disabled by
1529 * calling this function.
1530 */
1531int tb_dp_port_enable(struct tb_port *port, bool enable)
1532{
1533 u32 data[2];
1534 int ret;
1535
1536 ret = tb_port_read(port, data, TB_CFG_PORT,
1537 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1538 if (ret)
1539 return ret;
1540
1541 if (enable)
1542 data[0] |= ADP_DP_CS_0_VE | ADP_DP_CS_0_AE;
1543 else
1544 data[0] &= ~(ADP_DP_CS_0_VE | ADP_DP_CS_0_AE);
1545
1546 return tb_port_write(port, data, TB_CFG_PORT,
1547 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1548}
1549
1550/* switch utility functions */
1551
1552static const char *tb_switch_generation_name(const struct tb_switch *sw)
1553{
1554 switch (sw->generation) {
1555 case 1:
1556 return "Thunderbolt 1";
1557 case 2:
1558 return "Thunderbolt 2";
1559 case 3:
1560 return "Thunderbolt 3";
1561 case 4:
1562 return "USB4";
1563 default:
1564 return "Unknown";
1565 }
1566}
1567
1568static void tb_dump_switch(const struct tb *tb, const struct tb_switch *sw)
1569{
1570 const struct tb_regs_switch_header *regs = &sw->config;
1571
1572 tb_dbg(tb, " %s Switch: %x:%x (Revision: %d, TB Version: %d)\n",
1573 tb_switch_generation_name(sw), regs->vendor_id, regs->device_id,
1574 regs->revision, regs->thunderbolt_version);
1575 tb_dbg(tb, " Max Port Number: %d\n", regs->max_port_number);
1576 tb_dbg(tb, " Config:\n");
1577 tb_dbg(tb,
1578 " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
1579 regs->upstream_port_number, regs->depth,
1580 (((u64) regs->route_hi) << 32) | regs->route_lo,
1581 regs->enabled, regs->plug_events_delay);
1582 tb_dbg(tb, " unknown1: %#x unknown4: %#x\n",
1583 regs->__unknown1, regs->__unknown4);
1584}
1585
1586/**
1587 * tb_switch_reset() - reconfigure route, enable and send TB_CFG_PKG_RESET
1588 * @sw: Switch to reset
1589 *
1590 * Return: Returns 0 on success or an error code on failure.
1591 */
1592int tb_switch_reset(struct tb_switch *sw)
1593{
1594 struct tb_cfg_result res;
1595
1596 if (sw->generation > 1)
1597 return 0;
1598
1599 tb_sw_dbg(sw, "resetting switch\n");
1600
1601 res.err = tb_sw_write(sw, ((u32 *) &sw->config) + 2,
1602 TB_CFG_SWITCH, 2, 2);
1603 if (res.err)
1604 return res.err;
1605 res = tb_cfg_reset(sw->tb->ctl, tb_route(sw));
1606 if (res.err > 0)
1607 return -EIO;
1608 return res.err;
1609}
1610
1611/**
1612 * tb_switch_wait_for_bit() - Wait for specified value of bits in offset
1613 * @sw: Router to read the offset value from
1614 * @offset: Offset in the router config space to read from
1615 * @bit: Bit mask in the offset to wait for
1616 * @value: Value of the bits to wait for
1617 * @timeout_msec: Timeout in ms how long to wait
1618 *
1619 * Wait till the specified bits in specified offset reach specified value.
1620 * Returns %0 in case of success, %-ETIMEDOUT if the @value was not reached
1621 * within the given timeout or a negative errno in case of failure.
1622 */
1623int tb_switch_wait_for_bit(struct tb_switch *sw, u32 offset, u32 bit,
1624 u32 value, int timeout_msec)
1625{
1626 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
1627
1628 do {
1629 u32 val;
1630 int ret;
1631
1632 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
1633 if (ret)
1634 return ret;
1635
1636 if ((val & bit) == value)
1637 return 0;
1638
1639 usleep_range(50, 100);
1640 } while (ktime_before(ktime_get(), timeout));
1641
1642 return -ETIMEDOUT;
1643}
1644
1645/*
1646 * tb_plug_events_active() - enable/disable plug events on a switch
1647 *
1648 * Also configures a sane plug_events_delay of 255ms.
1649 *
1650 * Return: Returns 0 on success or an error code on failure.
1651 */
1652static int tb_plug_events_active(struct tb_switch *sw, bool active)
1653{
1654 u32 data;
1655 int res;
1656
1657 if (tb_switch_is_icm(sw) || tb_switch_is_usb4(sw))
1658 return 0;
1659
1660 sw->config.plug_events_delay = 0xff;
1661 res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
1662 if (res)
1663 return res;
1664
1665 res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
1666 if (res)
1667 return res;
1668
1669 if (active) {
1670 data = data & 0xFFFFFF83;
1671 switch (sw->config.device_id) {
1672 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1673 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1674 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1675 break;
1676 default:
1677 /*
1678 * Skip Alpine Ridge, it needs to have vendor
1679 * specific USB hotplug event enabled for the
1680 * internal xHCI to work.
1681 */
1682 if (!tb_switch_is_alpine_ridge(sw))
1683 data |= TB_PLUG_EVENTS_USB_DISABLE;
1684 }
1685 } else {
1686 data = data | 0x7c;
1687 }
1688 return tb_sw_write(sw, &data, TB_CFG_SWITCH,
1689 sw->cap_plug_events + 1, 1);
1690}
1691
1692static ssize_t authorized_show(struct device *dev,
1693 struct device_attribute *attr,
1694 char *buf)
1695{
1696 struct tb_switch *sw = tb_to_switch(dev);
1697
1698 return sysfs_emit(buf, "%u\n", sw->authorized);
1699}
1700
1701static int disapprove_switch(struct device *dev, void *not_used)
1702{
1703 char *envp[] = { "AUTHORIZED=0", NULL };
1704 struct tb_switch *sw;
1705
1706 sw = tb_to_switch(dev);
1707 if (sw && sw->authorized) {
1708 int ret;
1709
1710 /* First children */
1711 ret = device_for_each_child_reverse(&sw->dev, NULL, disapprove_switch);
1712 if (ret)
1713 return ret;
1714
1715 ret = tb_domain_disapprove_switch(sw->tb, sw);
1716 if (ret)
1717 return ret;
1718
1719 sw->authorized = 0;
1720 kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);
1721 }
1722
1723 return 0;
1724}
1725
1726static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
1727{
1728 char envp_string[13];
1729 int ret = -EINVAL;
1730 char *envp[] = { envp_string, NULL };
1731
1732 if (!mutex_trylock(&sw->tb->lock))
1733 return restart_syscall();
1734
1735 if (!!sw->authorized == !!val)
1736 goto unlock;
1737
1738 switch (val) {
1739 /* Disapprove switch */
1740 case 0:
1741 if (tb_route(sw)) {
1742 ret = disapprove_switch(&sw->dev, NULL);
1743 goto unlock;
1744 }
1745 break;
1746
1747 /* Approve switch */
1748 case 1:
1749 if (sw->key)
1750 ret = tb_domain_approve_switch_key(sw->tb, sw);
1751 else
1752 ret = tb_domain_approve_switch(sw->tb, sw);
1753 break;
1754
1755 /* Challenge switch */
1756 case 2:
1757 if (sw->key)
1758 ret = tb_domain_challenge_switch_key(sw->tb, sw);
1759 break;
1760
1761 default:
1762 break;
1763 }
1764
1765 if (!ret) {
1766 sw->authorized = val;
1767 /*
1768 * Notify status change to the userspace, informing the new
1769 * value of /sys/bus/thunderbolt/devices/.../authorized.
1770 */
1771 sprintf(envp_string, "AUTHORIZED=%u", sw->authorized);
1772 kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);
1773 }
1774
1775unlock:
1776 mutex_unlock(&sw->tb->lock);
1777 return ret;
1778}
1779
1780static ssize_t authorized_store(struct device *dev,
1781 struct device_attribute *attr,
1782 const char *buf, size_t count)
1783{
1784 struct tb_switch *sw = tb_to_switch(dev);
1785 unsigned int val;
1786 ssize_t ret;
1787
1788 ret = kstrtouint(buf, 0, &val);
1789 if (ret)
1790 return ret;
1791 if (val > 2)
1792 return -EINVAL;
1793
1794 pm_runtime_get_sync(&sw->dev);
1795 ret = tb_switch_set_authorized(sw, val);
1796 pm_runtime_mark_last_busy(&sw->dev);
1797 pm_runtime_put_autosuspend(&sw->dev);
1798
1799 return ret ? ret : count;
1800}
1801static DEVICE_ATTR_RW(authorized);
1802
1803static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
1804 char *buf)
1805{
1806 struct tb_switch *sw = tb_to_switch(dev);
1807
1808 return sysfs_emit(buf, "%u\n", sw->boot);
1809}
1810static DEVICE_ATTR_RO(boot);
1811
1812static ssize_t device_show(struct device *dev, struct device_attribute *attr,
1813 char *buf)
1814{
1815 struct tb_switch *sw = tb_to_switch(dev);
1816
1817 return sysfs_emit(buf, "%#x\n", sw->device);
1818}
1819static DEVICE_ATTR_RO(device);
1820
1821static ssize_t
1822device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1823{
1824 struct tb_switch *sw = tb_to_switch(dev);
1825
1826 return sysfs_emit(buf, "%s\n", sw->device_name ?: "");
1827}
1828static DEVICE_ATTR_RO(device_name);
1829
1830static ssize_t
1831generation_show(struct device *dev, struct device_attribute *attr, char *buf)
1832{
1833 struct tb_switch *sw = tb_to_switch(dev);
1834
1835 return sysfs_emit(buf, "%u\n", sw->generation);
1836}
1837static DEVICE_ATTR_RO(generation);
1838
1839static ssize_t key_show(struct device *dev, struct device_attribute *attr,
1840 char *buf)
1841{
1842 struct tb_switch *sw = tb_to_switch(dev);
1843 ssize_t ret;
1844
1845 if (!mutex_trylock(&sw->tb->lock))
1846 return restart_syscall();
1847
1848 if (sw->key)
1849 ret = sysfs_emit(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
1850 else
1851 ret = sysfs_emit(buf, "\n");
1852
1853 mutex_unlock(&sw->tb->lock);
1854 return ret;
1855}
1856
1857static ssize_t key_store(struct device *dev, struct device_attribute *attr,
1858 const char *buf, size_t count)
1859{
1860 struct tb_switch *sw = tb_to_switch(dev);
1861 u8 key[TB_SWITCH_KEY_SIZE];
1862 ssize_t ret = count;
1863 bool clear = false;
1864
1865 if (!strcmp(buf, "\n"))
1866 clear = true;
1867 else if (hex2bin(key, buf, sizeof(key)))
1868 return -EINVAL;
1869
1870 if (!mutex_trylock(&sw->tb->lock))
1871 return restart_syscall();
1872
1873 if (sw->authorized) {
1874 ret = -EBUSY;
1875 } else {
1876 kfree(sw->key);
1877 if (clear) {
1878 sw->key = NULL;
1879 } else {
1880 sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
1881 if (!sw->key)
1882 ret = -ENOMEM;
1883 }
1884 }
1885
1886 mutex_unlock(&sw->tb->lock);
1887 return ret;
1888}
1889static DEVICE_ATTR(key, 0600, key_show, key_store);
1890
1891static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
1892 char *buf)
1893{
1894 struct tb_switch *sw = tb_to_switch(dev);
1895
1896 return sysfs_emit(buf, "%u.0 Gb/s\n", sw->link_speed);
1897}
1898
1899/*
1900 * Currently all lanes must run at the same speed but we expose here
1901 * both directions to allow possible asymmetric links in the future.
1902 */
1903static DEVICE_ATTR(rx_speed, 0444, speed_show, NULL);
1904static DEVICE_ATTR(tx_speed, 0444, speed_show, NULL);
1905
1906static ssize_t lanes_show(struct device *dev, struct device_attribute *attr,
1907 char *buf)
1908{
1909 struct tb_switch *sw = tb_to_switch(dev);
1910
1911 return sysfs_emit(buf, "%u\n", sw->link_width);
1912}
1913
1914/*
1915 * Currently link has same amount of lanes both directions (1 or 2) but
1916 * expose them separately to allow possible asymmetric links in the future.
1917 */
1918static DEVICE_ATTR(rx_lanes, 0444, lanes_show, NULL);
1919static DEVICE_ATTR(tx_lanes, 0444, lanes_show, NULL);
1920
1921static ssize_t nvm_authenticate_show(struct device *dev,
1922 struct device_attribute *attr, char *buf)
1923{
1924 struct tb_switch *sw = tb_to_switch(dev);
1925 u32 status;
1926
1927 nvm_get_auth_status(sw, &status);
1928 return sysfs_emit(buf, "%#x\n", status);
1929}
1930
1931static ssize_t nvm_authenticate_sysfs(struct device *dev, const char *buf,
1932 bool disconnect)
1933{
1934 struct tb_switch *sw = tb_to_switch(dev);
1935 int val, ret;
1936
1937 pm_runtime_get_sync(&sw->dev);
1938
1939 if (!mutex_trylock(&sw->tb->lock)) {
1940 ret = restart_syscall();
1941 goto exit_rpm;
1942 }
1943
1944 if (sw->no_nvm_upgrade) {
1945 ret = -EOPNOTSUPP;
1946 goto exit_unlock;
1947 }
1948
1949 /* If NVMem devices are not yet added */
1950 if (!sw->nvm) {
1951 ret = -EAGAIN;
1952 goto exit_unlock;
1953 }
1954
1955 ret = kstrtoint(buf, 10, &val);
1956 if (ret)
1957 goto exit_unlock;
1958
1959 /* Always clear the authentication status */
1960 nvm_clear_auth_status(sw);
1961
1962 if (val > 0) {
1963 if (val == AUTHENTICATE_ONLY) {
1964 if (disconnect)
1965 ret = -EINVAL;
1966 else
1967 ret = nvm_authenticate(sw, true);
1968 } else {
1969 if (!sw->nvm->flushed) {
1970 if (!sw->nvm->buf) {
1971 ret = -EINVAL;
1972 goto exit_unlock;
1973 }
1974
1975 ret = nvm_validate_and_write(sw);
1976 if (ret || val == WRITE_ONLY)
1977 goto exit_unlock;
1978 }
1979 if (val == WRITE_AND_AUTHENTICATE) {
1980 if (disconnect)
1981 ret = tb_lc_force_power(sw);
1982 else
1983 ret = nvm_authenticate(sw, false);
1984 }
1985 }
1986 }
1987
1988exit_unlock:
1989 mutex_unlock(&sw->tb->lock);
1990exit_rpm:
1991 pm_runtime_mark_last_busy(&sw->dev);
1992 pm_runtime_put_autosuspend(&sw->dev);
1993
1994 return ret;
1995}
1996
1997static ssize_t nvm_authenticate_store(struct device *dev,
1998 struct device_attribute *attr, const char *buf, size_t count)
1999{
2000 int ret = nvm_authenticate_sysfs(dev, buf, false);
2001 if (ret)
2002 return ret;
2003 return count;
2004}
2005static DEVICE_ATTR_RW(nvm_authenticate);
2006
2007static ssize_t nvm_authenticate_on_disconnect_show(struct device *dev,
2008 struct device_attribute *attr, char *buf)
2009{
2010 return nvm_authenticate_show(dev, attr, buf);
2011}
2012
2013static ssize_t nvm_authenticate_on_disconnect_store(struct device *dev,
2014 struct device_attribute *attr, const char *buf, size_t count)
2015{
2016 int ret;
2017
2018 ret = nvm_authenticate_sysfs(dev, buf, true);
2019 return ret ? ret : count;
2020}
2021static DEVICE_ATTR_RW(nvm_authenticate_on_disconnect);
2022
2023static ssize_t nvm_version_show(struct device *dev,
2024 struct device_attribute *attr, char *buf)
2025{
2026 struct tb_switch *sw = tb_to_switch(dev);
2027 int ret;
2028
2029 if (!mutex_trylock(&sw->tb->lock))
2030 return restart_syscall();
2031
2032 if (sw->safe_mode)
2033 ret = -ENODATA;
2034 else if (!sw->nvm)
2035 ret = -EAGAIN;
2036 else
2037 ret = sysfs_emit(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
2038
2039 mutex_unlock(&sw->tb->lock);
2040
2041 return ret;
2042}
2043static DEVICE_ATTR_RO(nvm_version);
2044
2045static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
2046 char *buf)
2047{
2048 struct tb_switch *sw = tb_to_switch(dev);
2049
2050 return sysfs_emit(buf, "%#x\n", sw->vendor);
2051}
2052static DEVICE_ATTR_RO(vendor);
2053
2054static ssize_t
2055vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
2056{
2057 struct tb_switch *sw = tb_to_switch(dev);
2058
2059 return sysfs_emit(buf, "%s\n", sw->vendor_name ?: "");
2060}
2061static DEVICE_ATTR_RO(vendor_name);
2062
2063static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
2064 char *buf)
2065{
2066 struct tb_switch *sw = tb_to_switch(dev);
2067
2068 return sysfs_emit(buf, "%pUb\n", sw->uuid);
2069}
2070static DEVICE_ATTR_RO(unique_id);
2071
2072static struct attribute *switch_attrs[] = {
2073 &dev_attr_authorized.attr,
2074 &dev_attr_boot.attr,
2075 &dev_attr_device.attr,
2076 &dev_attr_device_name.attr,
2077 &dev_attr_generation.attr,
2078 &dev_attr_key.attr,
2079 &dev_attr_nvm_authenticate.attr,
2080 &dev_attr_nvm_authenticate_on_disconnect.attr,
2081 &dev_attr_nvm_version.attr,
2082 &dev_attr_rx_speed.attr,
2083 &dev_attr_rx_lanes.attr,
2084 &dev_attr_tx_speed.attr,
2085 &dev_attr_tx_lanes.attr,
2086 &dev_attr_vendor.attr,
2087 &dev_attr_vendor_name.attr,
2088 &dev_attr_unique_id.attr,
2089 NULL,
2090};
2091
2092static umode_t switch_attr_is_visible(struct kobject *kobj,
2093 struct attribute *attr, int n)
2094{
2095 struct device *dev = kobj_to_dev(kobj);
2096 struct tb_switch *sw = tb_to_switch(dev);
2097
2098 if (attr == &dev_attr_authorized.attr) {
2099 if (sw->tb->security_level == TB_SECURITY_NOPCIE ||
2100 sw->tb->security_level == TB_SECURITY_DPONLY)
2101 return 0;
2102 } else if (attr == &dev_attr_device.attr) {
2103 if (!sw->device)
2104 return 0;
2105 } else if (attr == &dev_attr_device_name.attr) {
2106 if (!sw->device_name)
2107 return 0;
2108 } else if (attr == &dev_attr_vendor.attr) {
2109 if (!sw->vendor)
2110 return 0;
2111 } else if (attr == &dev_attr_vendor_name.attr) {
2112 if (!sw->vendor_name)
2113 return 0;
2114 } else if (attr == &dev_attr_key.attr) {
2115 if (tb_route(sw) &&
2116 sw->tb->security_level == TB_SECURITY_SECURE &&
2117 sw->security_level == TB_SECURITY_SECURE)
2118 return attr->mode;
2119 return 0;
2120 } else if (attr == &dev_attr_rx_speed.attr ||
2121 attr == &dev_attr_rx_lanes.attr ||
2122 attr == &dev_attr_tx_speed.attr ||
2123 attr == &dev_attr_tx_lanes.attr) {
2124 if (tb_route(sw))
2125 return attr->mode;
2126 return 0;
2127 } else if (attr == &dev_attr_nvm_authenticate.attr) {
2128 if (nvm_upgradeable(sw))
2129 return attr->mode;
2130 return 0;
2131 } else if (attr == &dev_attr_nvm_version.attr) {
2132 if (nvm_readable(sw))
2133 return attr->mode;
2134 return 0;
2135 } else if (attr == &dev_attr_boot.attr) {
2136 if (tb_route(sw))
2137 return attr->mode;
2138 return 0;
2139 } else if (attr == &dev_attr_nvm_authenticate_on_disconnect.attr) {
2140 if (sw->quirks & QUIRK_FORCE_POWER_LINK_CONTROLLER)
2141 return attr->mode;
2142 return 0;
2143 }
2144
2145 return sw->safe_mode ? 0 : attr->mode;
2146}
2147
2148static const struct attribute_group switch_group = {
2149 .is_visible = switch_attr_is_visible,
2150 .attrs = switch_attrs,
2151};
2152
2153static const struct attribute_group *switch_groups[] = {
2154 &switch_group,
2155 NULL,
2156};
2157
2158static void tb_switch_release(struct device *dev)
2159{
2160 struct tb_switch *sw = tb_to_switch(dev);
2161 struct tb_port *port;
2162
2163 dma_port_free(sw->dma_port);
2164
2165 tb_switch_for_each_port(sw, port) {
2166 ida_destroy(&port->in_hopids);
2167 ida_destroy(&port->out_hopids);
2168 }
2169
2170 kfree(sw->uuid);
2171 kfree(sw->device_name);
2172 kfree(sw->vendor_name);
2173 kfree(sw->ports);
2174 kfree(sw->drom);
2175 kfree(sw->key);
2176 kfree(sw);
2177}
2178
2179static int tb_switch_uevent(struct device *dev, struct kobj_uevent_env *env)
2180{
2181 struct tb_switch *sw = tb_to_switch(dev);
2182 const char *type;
2183
2184 if (sw->config.thunderbolt_version == USB4_VERSION_1_0) {
2185 if (add_uevent_var(env, "USB4_VERSION=1.0"))
2186 return -ENOMEM;
2187 }
2188
2189 if (!tb_route(sw)) {
2190 type = "host";
2191 } else {
2192 const struct tb_port *port;
2193 bool hub = false;
2194
2195 /* Device is hub if it has any downstream ports */
2196 tb_switch_for_each_port(sw, port) {
2197 if (!port->disabled && !tb_is_upstream_port(port) &&
2198 tb_port_is_null(port)) {
2199 hub = true;
2200 break;
2201 }
2202 }
2203
2204 type = hub ? "hub" : "device";
2205 }
2206
2207 if (add_uevent_var(env, "USB4_TYPE=%s", type))
2208 return -ENOMEM;
2209 return 0;
2210}
2211
2212/*
2213 * Currently only need to provide the callbacks. Everything else is handled
2214 * in the connection manager.
2215 */
2216static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
2217{
2218 struct tb_switch *sw = tb_to_switch(dev);
2219 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
2220
2221 if (cm_ops->runtime_suspend_switch)
2222 return cm_ops->runtime_suspend_switch(sw);
2223
2224 return 0;
2225}
2226
2227static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
2228{
2229 struct tb_switch *sw = tb_to_switch(dev);
2230 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
2231
2232 if (cm_ops->runtime_resume_switch)
2233 return cm_ops->runtime_resume_switch(sw);
2234 return 0;
2235}
2236
2237static const struct dev_pm_ops tb_switch_pm_ops = {
2238 SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
2239 NULL)
2240};
2241
2242struct device_type tb_switch_type = {
2243 .name = "thunderbolt_device",
2244 .release = tb_switch_release,
2245 .uevent = tb_switch_uevent,
2246 .pm = &tb_switch_pm_ops,
2247};
2248
2249static int tb_switch_get_generation(struct tb_switch *sw)
2250{
2251 switch (sw->config.device_id) {
2252 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
2253 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
2254 case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
2255 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
2256 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
2257 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
2258 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
2259 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
2260 return 1;
2261
2262 case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
2263 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
2264 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
2265 return 2;
2266
2267 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
2268 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
2269 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
2270 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
2271 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
2272 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
2273 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
2274 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
2275 case PCI_DEVICE_ID_INTEL_ICL_NHI0:
2276 case PCI_DEVICE_ID_INTEL_ICL_NHI1:
2277 return 3;
2278
2279 default:
2280 if (tb_switch_is_usb4(sw))
2281 return 4;
2282
2283 /*
2284 * For unknown switches assume generation to be 1 to be
2285 * on the safe side.
2286 */
2287 tb_sw_warn(sw, "unsupported switch device id %#x\n",
2288 sw->config.device_id);
2289 return 1;
2290 }
2291}
2292
2293static bool tb_switch_exceeds_max_depth(const struct tb_switch *sw, int depth)
2294{
2295 int max_depth;
2296
2297 if (tb_switch_is_usb4(sw) ||
2298 (sw->tb->root_switch && tb_switch_is_usb4(sw->tb->root_switch)))
2299 max_depth = USB4_SWITCH_MAX_DEPTH;
2300 else
2301 max_depth = TB_SWITCH_MAX_DEPTH;
2302
2303 return depth > max_depth;
2304}
2305
2306/**
2307 * tb_switch_alloc() - allocate a switch
2308 * @tb: Pointer to the owning domain
2309 * @parent: Parent device for this switch
2310 * @route: Route string for this switch
2311 *
2312 * Allocates and initializes a switch. Will not upload configuration to
2313 * the switch. For that you need to call tb_switch_configure()
2314 * separately. The returned switch should be released by calling
2315 * tb_switch_put().
2316 *
2317 * Return: Pointer to the allocated switch or ERR_PTR() in case of
2318 * failure.
2319 */
2320struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
2321 u64 route)
2322{
2323 struct tb_switch *sw;
2324 int upstream_port;
2325 int i, ret, depth;
2326
2327 /* Unlock the downstream port so we can access the switch below */
2328 if (route) {
2329 struct tb_switch *parent_sw = tb_to_switch(parent);
2330 struct tb_port *down;
2331
2332 down = tb_port_at(route, parent_sw);
2333 tb_port_unlock(down);
2334 }
2335
2336 depth = tb_route_length(route);
2337
2338 upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
2339 if (upstream_port < 0)
2340 return ERR_PTR(upstream_port);
2341
2342 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
2343 if (!sw)
2344 return ERR_PTR(-ENOMEM);
2345
2346 sw->tb = tb;
2347 ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);
2348 if (ret)
2349 goto err_free_sw_ports;
2350
2351 sw->generation = tb_switch_get_generation(sw);
2352
2353 tb_dbg(tb, "current switch config:\n");
2354 tb_dump_switch(tb, sw);
2355
2356 /* configure switch */
2357 sw->config.upstream_port_number = upstream_port;
2358 sw->config.depth = depth;
2359 sw->config.route_hi = upper_32_bits(route);
2360 sw->config.route_lo = lower_32_bits(route);
2361 sw->config.enabled = 0;
2362
2363 /* Make sure we do not exceed maximum topology limit */
2364 if (tb_switch_exceeds_max_depth(sw, depth)) {
2365 ret = -EADDRNOTAVAIL;
2366 goto err_free_sw_ports;
2367 }
2368
2369 /* initialize ports */
2370 sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
2371 GFP_KERNEL);
2372 if (!sw->ports) {
2373 ret = -ENOMEM;
2374 goto err_free_sw_ports;
2375 }
2376
2377 for (i = 0; i <= sw->config.max_port_number; i++) {
2378 /* minimum setup for tb_find_cap and tb_drom_read to work */
2379 sw->ports[i].sw = sw;
2380 sw->ports[i].port = i;
2381
2382 /* Control port does not need HopID allocation */
2383 if (i) {
2384 ida_init(&sw->ports[i].in_hopids);
2385 ida_init(&sw->ports[i].out_hopids);
2386 }
2387 }
2388
2389 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
2390 if (ret > 0)
2391 sw->cap_plug_events = ret;
2392
2393 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_TIME2);
2394 if (ret > 0)
2395 sw->cap_vsec_tmu = ret;
2396
2397 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
2398 if (ret > 0)
2399 sw->cap_lc = ret;
2400
2401 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_CP_LP);
2402 if (ret > 0)
2403 sw->cap_lp = ret;
2404
2405 /* Root switch is always authorized */
2406 if (!route)
2407 sw->authorized = true;
2408
2409 device_initialize(&sw->dev);
2410 sw->dev.parent = parent;
2411 sw->dev.bus = &tb_bus_type;
2412 sw->dev.type = &tb_switch_type;
2413 sw->dev.groups = switch_groups;
2414 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
2415
2416 return sw;
2417
2418err_free_sw_ports:
2419 kfree(sw->ports);
2420 kfree(sw);
2421
2422 return ERR_PTR(ret);
2423}
2424
2425/**
2426 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
2427 * @tb: Pointer to the owning domain
2428 * @parent: Parent device for this switch
2429 * @route: Route string for this switch
2430 *
2431 * This creates a switch in safe mode. This means the switch pretty much
2432 * lacks all capabilities except DMA configuration port before it is
2433 * flashed with a valid NVM firmware.
2434 *
2435 * The returned switch must be released by calling tb_switch_put().
2436 *
2437 * Return: Pointer to the allocated switch or ERR_PTR() in case of failure
2438 */
2439struct tb_switch *
2440tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
2441{
2442 struct tb_switch *sw;
2443
2444 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
2445 if (!sw)
2446 return ERR_PTR(-ENOMEM);
2447
2448 sw->tb = tb;
2449 sw->config.depth = tb_route_length(route);
2450 sw->config.route_hi = upper_32_bits(route);
2451 sw->config.route_lo = lower_32_bits(route);
2452 sw->safe_mode = true;
2453
2454 device_initialize(&sw->dev);
2455 sw->dev.parent = parent;
2456 sw->dev.bus = &tb_bus_type;
2457 sw->dev.type = &tb_switch_type;
2458 sw->dev.groups = switch_groups;
2459 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
2460
2461 return sw;
2462}
2463
2464/**
2465 * tb_switch_configure() - Uploads configuration to the switch
2466 * @sw: Switch to configure
2467 *
2468 * Call this function before the switch is added to the system. It will
2469 * upload configuration to the switch and makes it available for the
2470 * connection manager to use. Can be called to the switch again after
2471 * resume from low power states to re-initialize it.
2472 *
2473 * Return: %0 in case of success and negative errno in case of failure
2474 */
2475int tb_switch_configure(struct tb_switch *sw)
2476{
2477 struct tb *tb = sw->tb;
2478 u64 route;
2479 int ret;
2480
2481 route = tb_route(sw);
2482
2483 tb_dbg(tb, "%s Switch at %#llx (depth: %d, up port: %d)\n",
2484 sw->config.enabled ? "restoring" : "initializing", route,
2485 tb_route_length(route), sw->config.upstream_port_number);
2486
2487 sw->config.enabled = 1;
2488
2489 if (tb_switch_is_usb4(sw)) {
2490 /*
2491 * For USB4 devices, we need to program the CM version
2492 * accordingly so that it knows to expose all the
2493 * additional capabilities.
2494 */
2495 sw->config.cmuv = USB4_VERSION_1_0;
2496 sw->config.plug_events_delay = 0xa;
2497
2498 /* Enumerate the switch */
2499 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2500 ROUTER_CS_1, 4);
2501 if (ret)
2502 return ret;
2503
2504 ret = usb4_switch_setup(sw);
2505 } else {
2506 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
2507 tb_sw_warn(sw, "unknown switch vendor id %#x\n",
2508 sw->config.vendor_id);
2509
2510 if (!sw->cap_plug_events) {
2511 tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
2512 return -ENODEV;
2513 }
2514
2515 /* Enumerate the switch */
2516 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2517 ROUTER_CS_1, 3);
2518 }
2519 if (ret)
2520 return ret;
2521
2522 return tb_plug_events_active(sw, true);
2523}
2524
2525static int tb_switch_set_uuid(struct tb_switch *sw)
2526{
2527 bool uid = false;
2528 u32 uuid[4];
2529 int ret;
2530
2531 if (sw->uuid)
2532 return 0;
2533
2534 if (tb_switch_is_usb4(sw)) {
2535 ret = usb4_switch_read_uid(sw, &sw->uid);
2536 if (ret)
2537 return ret;
2538 uid = true;
2539 } else {
2540 /*
2541 * The newer controllers include fused UUID as part of
2542 * link controller specific registers
2543 */
2544 ret = tb_lc_read_uuid(sw, uuid);
2545 if (ret) {
2546 if (ret != -EINVAL)
2547 return ret;
2548 uid = true;
2549 }
2550 }
2551
2552 if (uid) {
2553 /*
2554 * ICM generates UUID based on UID and fills the upper
2555 * two words with ones. This is not strictly following
2556 * UUID format but we want to be compatible with it so
2557 * we do the same here.
2558 */
2559 uuid[0] = sw->uid & 0xffffffff;
2560 uuid[1] = (sw->uid >> 32) & 0xffffffff;
2561 uuid[2] = 0xffffffff;
2562 uuid[3] = 0xffffffff;
2563 }
2564
2565 sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
2566 if (!sw->uuid)
2567 return -ENOMEM;
2568 return 0;
2569}
2570
2571static int tb_switch_add_dma_port(struct tb_switch *sw)
2572{
2573 u32 status;
2574 int ret;
2575
2576 switch (sw->generation) {
2577 case 2:
2578 /* Only root switch can be upgraded */
2579 if (tb_route(sw))
2580 return 0;
2581
2582 fallthrough;
2583 case 3:
2584 case 4:
2585 ret = tb_switch_set_uuid(sw);
2586 if (ret)
2587 return ret;
2588 break;
2589
2590 default:
2591 /*
2592 * DMA port is the only thing available when the switch
2593 * is in safe mode.
2594 */
2595 if (!sw->safe_mode)
2596 return 0;
2597 break;
2598 }
2599
2600 if (sw->no_nvm_upgrade)
2601 return 0;
2602
2603 if (tb_switch_is_usb4(sw)) {
2604 ret = usb4_switch_nvm_authenticate_status(sw, &status);
2605 if (ret)
2606 return ret;
2607
2608 if (status) {
2609 tb_sw_info(sw, "switch flash authentication failed\n");
2610 nvm_set_auth_status(sw, status);
2611 }
2612
2613 return 0;
2614 }
2615
2616 /* Root switch DMA port requires running firmware */
2617 if (!tb_route(sw) && !tb_switch_is_icm(sw))
2618 return 0;
2619
2620 sw->dma_port = dma_port_alloc(sw);
2621 if (!sw->dma_port)
2622 return 0;
2623
2624 /*
2625 * If there is status already set then authentication failed
2626 * when the dma_port_flash_update_auth() returned. Power cycling
2627 * is not needed (it was done already) so only thing we do here
2628 * is to unblock runtime PM of the root port.
2629 */
2630 nvm_get_auth_status(sw, &status);
2631 if (status) {
2632 if (!tb_route(sw))
2633 nvm_authenticate_complete_dma_port(sw);
2634 return 0;
2635 }
2636
2637 /*
2638 * Check status of the previous flash authentication. If there
2639 * is one we need to power cycle the switch in any case to make
2640 * it functional again.
2641 */
2642 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
2643 if (ret <= 0)
2644 return ret;
2645
2646 /* Now we can allow root port to suspend again */
2647 if (!tb_route(sw))
2648 nvm_authenticate_complete_dma_port(sw);
2649
2650 if (status) {
2651 tb_sw_info(sw, "switch flash authentication failed\n");
2652 nvm_set_auth_status(sw, status);
2653 }
2654
2655 tb_sw_info(sw, "power cycling the switch now\n");
2656 dma_port_power_cycle(sw->dma_port);
2657
2658 /*
2659 * We return error here which causes the switch adding failure.
2660 * It should appear back after power cycle is complete.
2661 */
2662 return -ESHUTDOWN;
2663}
2664
2665static void tb_switch_default_link_ports(struct tb_switch *sw)
2666{
2667 int i;
2668
2669 for (i = 1; i <= sw->config.max_port_number; i++) {
2670 struct tb_port *port = &sw->ports[i];
2671 struct tb_port *subordinate;
2672
2673 if (!tb_port_is_null(port))
2674 continue;
2675
2676 /* Check for the subordinate port */
2677 if (i == sw->config.max_port_number ||
2678 !tb_port_is_null(&sw->ports[i + 1]))
2679 continue;
2680
2681 /* Link them if not already done so (by DROM) */
2682 subordinate = &sw->ports[i + 1];
2683 if (!port->dual_link_port && !subordinate->dual_link_port) {
2684 port->link_nr = 0;
2685 port->dual_link_port = subordinate;
2686 subordinate->link_nr = 1;
2687 subordinate->dual_link_port = port;
2688
2689 tb_sw_dbg(sw, "linked ports %d <-> %d\n",
2690 port->port, subordinate->port);
2691 }
2692 }
2693}
2694
2695static bool tb_switch_lane_bonding_possible(struct tb_switch *sw)
2696{
2697 const struct tb_port *up = tb_upstream_port(sw);
2698
2699 if (!up->dual_link_port || !up->dual_link_port->remote)
2700 return false;
2701
2702 if (tb_switch_is_usb4(sw))
2703 return usb4_switch_lane_bonding_possible(sw);
2704 return tb_lc_lane_bonding_possible(sw);
2705}
2706
2707static int tb_switch_update_link_attributes(struct tb_switch *sw)
2708{
2709 struct tb_port *up;
2710 bool change = false;
2711 int ret;
2712
2713 if (!tb_route(sw) || tb_switch_is_icm(sw))
2714 return 0;
2715
2716 up = tb_upstream_port(sw);
2717
2718 ret = tb_port_get_link_speed(up);
2719 if (ret < 0)
2720 return ret;
2721 if (sw->link_speed != ret)
2722 change = true;
2723 sw->link_speed = ret;
2724
2725 ret = tb_port_get_link_width(up);
2726 if (ret < 0)
2727 return ret;
2728 if (sw->link_width != ret)
2729 change = true;
2730 sw->link_width = ret;
2731
2732 /* Notify userspace that there is possible link attribute change */
2733 if (device_is_registered(&sw->dev) && change)
2734 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
2735
2736 return 0;
2737}
2738
2739/**
2740 * tb_switch_lane_bonding_enable() - Enable lane bonding
2741 * @sw: Switch to enable lane bonding
2742 *
2743 * Connection manager can call this function to enable lane bonding of a
2744 * switch. If conditions are correct and both switches support the feature,
2745 * lanes are bonded. It is safe to call this to any switch.
2746 */
2747int tb_switch_lane_bonding_enable(struct tb_switch *sw)
2748{
2749 struct tb_switch *parent = tb_to_switch(sw->dev.parent);
2750 struct tb_port *up, *down;
2751 u64 route = tb_route(sw);
2752 int ret;
2753
2754 if (!route)
2755 return 0;
2756
2757 if (!tb_switch_lane_bonding_possible(sw))
2758 return 0;
2759
2760 up = tb_upstream_port(sw);
2761 down = tb_port_at(route, parent);
2762
2763 if (!tb_port_is_width_supported(up, 2) ||
2764 !tb_port_is_width_supported(down, 2))
2765 return 0;
2766
2767 ret = tb_port_lane_bonding_enable(up);
2768 if (ret) {
2769 tb_port_warn(up, "failed to enable lane bonding\n");
2770 return ret;
2771 }
2772
2773 ret = tb_port_lane_bonding_enable(down);
2774 if (ret) {
2775 tb_port_warn(down, "failed to enable lane bonding\n");
2776 tb_port_lane_bonding_disable(up);
2777 return ret;
2778 }
2779
2780 ret = tb_port_wait_for_link_width(down, 2, 100);
2781 if (ret) {
2782 tb_port_warn(down, "timeout enabling lane bonding\n");
2783 return ret;
2784 }
2785
2786 tb_port_update_credits(down);
2787 tb_port_update_credits(up);
2788 tb_switch_update_link_attributes(sw);
2789
2790 tb_sw_dbg(sw, "lane bonding enabled\n");
2791 return ret;
2792}
2793
2794/**
2795 * tb_switch_lane_bonding_disable() - Disable lane bonding
2796 * @sw: Switch whose lane bonding to disable
2797 *
2798 * Disables lane bonding between @sw and parent. This can be called even
2799 * if lanes were not bonded originally.
2800 */
2801void tb_switch_lane_bonding_disable(struct tb_switch *sw)
2802{
2803 struct tb_switch *parent = tb_to_switch(sw->dev.parent);
2804 struct tb_port *up, *down;
2805
2806 if (!tb_route(sw))
2807 return;
2808
2809 up = tb_upstream_port(sw);
2810 if (!up->bonded)
2811 return;
2812
2813 down = tb_port_at(tb_route(sw), parent);
2814
2815 tb_port_lane_bonding_disable(up);
2816 tb_port_lane_bonding_disable(down);
2817
2818 /*
2819 * It is fine if we get other errors as the router might have
2820 * been unplugged.
2821 */
2822 if (tb_port_wait_for_link_width(down, 1, 100) == -ETIMEDOUT)
2823 tb_sw_warn(sw, "timeout disabling lane bonding\n");
2824
2825 tb_port_update_credits(down);
2826 tb_port_update_credits(up);
2827 tb_switch_update_link_attributes(sw);
2828
2829 tb_sw_dbg(sw, "lane bonding disabled\n");
2830}
2831
2832/**
2833 * tb_switch_configure_link() - Set link configured
2834 * @sw: Switch whose link is configured
2835 *
2836 * Sets the link upstream from @sw configured (from both ends) so that
2837 * it will not be disconnected when the domain exits sleep. Can be
2838 * called for any switch.
2839 *
2840 * It is recommended that this is called after lane bonding is enabled.
2841 *
2842 * Returns %0 on success and negative errno in case of error.
2843 */
2844int tb_switch_configure_link(struct tb_switch *sw)
2845{
2846 struct tb_port *up, *down;
2847 int ret;
2848
2849 if (!tb_route(sw) || tb_switch_is_icm(sw))
2850 return 0;
2851
2852 up = tb_upstream_port(sw);
2853 if (tb_switch_is_usb4(up->sw))
2854 ret = usb4_port_configure(up);
2855 else
2856 ret = tb_lc_configure_port(up);
2857 if (ret)
2858 return ret;
2859
2860 down = up->remote;
2861 if (tb_switch_is_usb4(down->sw))
2862 return usb4_port_configure(down);
2863 return tb_lc_configure_port(down);
2864}
2865
2866/**
2867 * tb_switch_unconfigure_link() - Unconfigure link
2868 * @sw: Switch whose link is unconfigured
2869 *
2870 * Sets the link unconfigured so the @sw will be disconnected if the
2871 * domain exists sleep.
2872 */
2873void tb_switch_unconfigure_link(struct tb_switch *sw)
2874{
2875 struct tb_port *up, *down;
2876
2877 if (sw->is_unplugged)
2878 return;
2879 if (!tb_route(sw) || tb_switch_is_icm(sw))
2880 return;
2881
2882 up = tb_upstream_port(sw);
2883 if (tb_switch_is_usb4(up->sw))
2884 usb4_port_unconfigure(up);
2885 else
2886 tb_lc_unconfigure_port(up);
2887
2888 down = up->remote;
2889 if (tb_switch_is_usb4(down->sw))
2890 usb4_port_unconfigure(down);
2891 else
2892 tb_lc_unconfigure_port(down);
2893}
2894
2895static void tb_switch_credits_init(struct tb_switch *sw)
2896{
2897 if (tb_switch_is_icm(sw))
2898 return;
2899 if (!tb_switch_is_usb4(sw))
2900 return;
2901 if (usb4_switch_credits_init(sw))
2902 tb_sw_info(sw, "failed to determine preferred buffer allocation, using defaults\n");
2903}
2904
2905static int tb_switch_port_hotplug_enable(struct tb_switch *sw)
2906{
2907 struct tb_port *port;
2908
2909 if (tb_switch_is_icm(sw))
2910 return 0;
2911
2912 tb_switch_for_each_port(sw, port) {
2913 int res;
2914
2915 if (!port->cap_usb4)
2916 continue;
2917
2918 res = usb4_port_hotplug_enable(port);
2919 if (res)
2920 return res;
2921 }
2922 return 0;
2923}
2924
2925/**
2926 * tb_switch_add() - Add a switch to the domain
2927 * @sw: Switch to add
2928 *
2929 * This is the last step in adding switch to the domain. It will read
2930 * identification information from DROM and initializes ports so that
2931 * they can be used to connect other switches. The switch will be
2932 * exposed to the userspace when this function successfully returns. To
2933 * remove and release the switch, call tb_switch_remove().
2934 *
2935 * Return: %0 in case of success and negative errno in case of failure
2936 */
2937int tb_switch_add(struct tb_switch *sw)
2938{
2939 int i, ret;
2940
2941 /*
2942 * Initialize DMA control port now before we read DROM. Recent
2943 * host controllers have more complete DROM on NVM that includes
2944 * vendor and model identification strings which we then expose
2945 * to the userspace. NVM can be accessed through DMA
2946 * configuration based mailbox.
2947 */
2948 ret = tb_switch_add_dma_port(sw);
2949 if (ret) {
2950 dev_err(&sw->dev, "failed to add DMA port\n");
2951 return ret;
2952 }
2953
2954 if (!sw->safe_mode) {
2955 tb_switch_credits_init(sw);
2956
2957 /* read drom */
2958 ret = tb_drom_read(sw);
2959 if (ret)
2960 dev_warn(&sw->dev, "reading DROM failed: %d\n", ret);
2961 tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
2962
2963 tb_check_quirks(sw);
2964
2965 ret = tb_switch_set_uuid(sw);
2966 if (ret) {
2967 dev_err(&sw->dev, "failed to set UUID\n");
2968 return ret;
2969 }
2970
2971 for (i = 0; i <= sw->config.max_port_number; i++) {
2972 if (sw->ports[i].disabled) {
2973 tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
2974 continue;
2975 }
2976 ret = tb_init_port(&sw->ports[i]);
2977 if (ret) {
2978 dev_err(&sw->dev, "failed to initialize port %d\n", i);
2979 return ret;
2980 }
2981 }
2982
2983 tb_switch_default_link_ports(sw);
2984
2985 ret = tb_switch_update_link_attributes(sw);
2986 if (ret)
2987 return ret;
2988
2989 ret = tb_switch_tmu_init(sw);
2990 if (ret)
2991 return ret;
2992 }
2993
2994 ret = tb_switch_port_hotplug_enable(sw);
2995 if (ret)
2996 return ret;
2997
2998 ret = device_add(&sw->dev);
2999 if (ret) {
3000 dev_err(&sw->dev, "failed to add device: %d\n", ret);
3001 return ret;
3002 }
3003
3004 if (tb_route(sw)) {
3005 dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
3006 sw->vendor, sw->device);
3007 if (sw->vendor_name && sw->device_name)
3008 dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
3009 sw->device_name);
3010 }
3011
3012 ret = usb4_switch_add_ports(sw);
3013 if (ret) {
3014 dev_err(&sw->dev, "failed to add USB4 ports\n");
3015 goto err_del;
3016 }
3017
3018 ret = tb_switch_nvm_add(sw);
3019 if (ret) {
3020 dev_err(&sw->dev, "failed to add NVM devices\n");
3021 goto err_ports;
3022 }
3023
3024 /*
3025 * Thunderbolt routers do not generate wakeups themselves but
3026 * they forward wakeups from tunneled protocols, so enable it
3027 * here.
3028 */
3029 device_init_wakeup(&sw->dev, true);
3030
3031 pm_runtime_set_active(&sw->dev);
3032 if (sw->rpm) {
3033 pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
3034 pm_runtime_use_autosuspend(&sw->dev);
3035 pm_runtime_mark_last_busy(&sw->dev);
3036 pm_runtime_enable(&sw->dev);
3037 pm_request_autosuspend(&sw->dev);
3038 }
3039
3040 tb_switch_debugfs_init(sw);
3041 return 0;
3042
3043err_ports:
3044 usb4_switch_remove_ports(sw);
3045err_del:
3046 device_del(&sw->dev);
3047
3048 return ret;
3049}
3050
3051/**
3052 * tb_switch_remove() - Remove and release a switch
3053 * @sw: Switch to remove
3054 *
3055 * This will remove the switch from the domain and release it after last
3056 * reference count drops to zero. If there are switches connected below
3057 * this switch, they will be removed as well.
3058 */
3059void tb_switch_remove(struct tb_switch *sw)
3060{
3061 struct tb_port *port;
3062
3063 tb_switch_debugfs_remove(sw);
3064
3065 if (sw->rpm) {
3066 pm_runtime_get_sync(&sw->dev);
3067 pm_runtime_disable(&sw->dev);
3068 }
3069
3070 /* port 0 is the switch itself and never has a remote */
3071 tb_switch_for_each_port(sw, port) {
3072 if (tb_port_has_remote(port)) {
3073 tb_switch_remove(port->remote->sw);
3074 port->remote = NULL;
3075 } else if (port->xdomain) {
3076 tb_xdomain_remove(port->xdomain);
3077 port->xdomain = NULL;
3078 }
3079
3080 /* Remove any downstream retimers */
3081 tb_retimer_remove_all(port);
3082 }
3083
3084 if (!sw->is_unplugged)
3085 tb_plug_events_active(sw, false);
3086
3087 tb_switch_nvm_remove(sw);
3088 usb4_switch_remove_ports(sw);
3089
3090 if (tb_route(sw))
3091 dev_info(&sw->dev, "device disconnected\n");
3092 device_unregister(&sw->dev);
3093}
3094
3095/**
3096 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
3097 * @sw: Router to mark unplugged
3098 */
3099void tb_sw_set_unplugged(struct tb_switch *sw)
3100{
3101 struct tb_port *port;
3102
3103 if (sw == sw->tb->root_switch) {
3104 tb_sw_WARN(sw, "cannot unplug root switch\n");
3105 return;
3106 }
3107 if (sw->is_unplugged) {
3108 tb_sw_WARN(sw, "is_unplugged already set\n");
3109 return;
3110 }
3111 sw->is_unplugged = true;
3112 tb_switch_for_each_port(sw, port) {
3113 if (tb_port_has_remote(port))
3114 tb_sw_set_unplugged(port->remote->sw);
3115 else if (port->xdomain)
3116 port->xdomain->is_unplugged = true;
3117 }
3118}
3119
3120static int tb_switch_set_wake(struct tb_switch *sw, unsigned int flags)
3121{
3122 if (flags)
3123 tb_sw_dbg(sw, "enabling wakeup: %#x\n", flags);
3124 else
3125 tb_sw_dbg(sw, "disabling wakeup\n");
3126
3127 if (tb_switch_is_usb4(sw))
3128 return usb4_switch_set_wake(sw, flags);
3129 return tb_lc_set_wake(sw, flags);
3130}
3131
3132int tb_switch_resume(struct tb_switch *sw)
3133{
3134 struct tb_port *port;
3135 int err;
3136
3137 tb_sw_dbg(sw, "resuming switch\n");
3138
3139 /*
3140 * Check for UID of the connected switches except for root
3141 * switch which we assume cannot be removed.
3142 */
3143 if (tb_route(sw)) {
3144 u64 uid;
3145
3146 /*
3147 * Check first that we can still read the switch config
3148 * space. It may be that there is now another domain
3149 * connected.
3150 */
3151 err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
3152 if (err < 0) {
3153 tb_sw_info(sw, "switch not present anymore\n");
3154 return err;
3155 }
3156
3157 /* We don't have any way to confirm this was the same device */
3158 if (!sw->uid)
3159 return -ENODEV;
3160
3161 if (tb_switch_is_usb4(sw))
3162 err = usb4_switch_read_uid(sw, &uid);
3163 else
3164 err = tb_drom_read_uid_only(sw, &uid);
3165 if (err) {
3166 tb_sw_warn(sw, "uid read failed\n");
3167 return err;
3168 }
3169 if (sw->uid != uid) {
3170 tb_sw_info(sw,
3171 "changed while suspended (uid %#llx -> %#llx)\n",
3172 sw->uid, uid);
3173 return -ENODEV;
3174 }
3175 }
3176
3177 err = tb_switch_configure(sw);
3178 if (err)
3179 return err;
3180
3181 /* Disable wakes */
3182 tb_switch_set_wake(sw, 0);
3183
3184 err = tb_switch_tmu_init(sw);
3185 if (err)
3186 return err;
3187
3188 /* check for surviving downstream switches */
3189 tb_switch_for_each_port(sw, port) {
3190 if (!tb_port_is_null(port))
3191 continue;
3192
3193 if (!tb_port_resume(port))
3194 continue;
3195
3196 if (tb_wait_for_port(port, true) <= 0) {
3197 tb_port_warn(port,
3198 "lost during suspend, disconnecting\n");
3199 if (tb_port_has_remote(port))
3200 tb_sw_set_unplugged(port->remote->sw);
3201 else if (port->xdomain)
3202 port->xdomain->is_unplugged = true;
3203 } else {
3204 /*
3205 * Always unlock the port so the downstream
3206 * switch/domain is accessible.
3207 */
3208 if (tb_port_unlock(port))
3209 tb_port_warn(port, "failed to unlock port\n");
3210 if (port->remote && tb_switch_resume(port->remote->sw)) {
3211 tb_port_warn(port,
3212 "lost during suspend, disconnecting\n");
3213 tb_sw_set_unplugged(port->remote->sw);
3214 }
3215 }
3216 }
3217 return 0;
3218}
3219
3220/**
3221 * tb_switch_suspend() - Put a switch to sleep
3222 * @sw: Switch to suspend
3223 * @runtime: Is this runtime suspend or system sleep
3224 *
3225 * Suspends router and all its children. Enables wakes according to
3226 * value of @runtime and then sets sleep bit for the router. If @sw is
3227 * host router the domain is ready to go to sleep once this function
3228 * returns.
3229 */
3230void tb_switch_suspend(struct tb_switch *sw, bool runtime)
3231{
3232 unsigned int flags = 0;
3233 struct tb_port *port;
3234 int err;
3235
3236 tb_sw_dbg(sw, "suspending switch\n");
3237
3238 /*
3239 * Actually only needed for Titan Ridge but for simplicity can be
3240 * done for USB4 device too as CLx is re-enabled at resume.
3241 * CL0s and CL1 are enabled and supported together.
3242 */
3243 if (tb_switch_is_clx_enabled(sw, TB_CL1)) {
3244 if (tb_switch_disable_clx(sw, TB_CL1))
3245 tb_sw_warn(sw, "failed to disable %s on upstream port\n",
3246 tb_switch_clx_name(TB_CL1));
3247 }
3248
3249 err = tb_plug_events_active(sw, false);
3250 if (err)
3251 return;
3252
3253 tb_switch_for_each_port(sw, port) {
3254 if (tb_port_has_remote(port))
3255 tb_switch_suspend(port->remote->sw, runtime);
3256 }
3257
3258 if (runtime) {
3259 /* Trigger wake when something is plugged in/out */
3260 flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT;
3261 flags |= TB_WAKE_ON_USB4;
3262 flags |= TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE | TB_WAKE_ON_DP;
3263 } else if (device_may_wakeup(&sw->dev)) {
3264 flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;
3265 }
3266
3267 tb_switch_set_wake(sw, flags);
3268
3269 if (tb_switch_is_usb4(sw))
3270 usb4_switch_set_sleep(sw);
3271 else
3272 tb_lc_set_sleep(sw);
3273}
3274
3275/**
3276 * tb_switch_query_dp_resource() - Query availability of DP resource
3277 * @sw: Switch whose DP resource is queried
3278 * @in: DP IN port
3279 *
3280 * Queries availability of DP resource for DP tunneling using switch
3281 * specific means. Returns %true if resource is available.
3282 */
3283bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in)
3284{
3285 if (tb_switch_is_usb4(sw))
3286 return usb4_switch_query_dp_resource(sw, in);
3287 return tb_lc_dp_sink_query(sw, in);
3288}
3289
3290/**
3291 * tb_switch_alloc_dp_resource() - Allocate available DP resource
3292 * @sw: Switch whose DP resource is allocated
3293 * @in: DP IN port
3294 *
3295 * Allocates DP resource for DP tunneling. The resource must be
3296 * available for this to succeed (see tb_switch_query_dp_resource()).
3297 * Returns %0 in success and negative errno otherwise.
3298 */
3299int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
3300{
3301 int ret;
3302
3303 if (tb_switch_is_usb4(sw))
3304 ret = usb4_switch_alloc_dp_resource(sw, in);
3305 else
3306 ret = tb_lc_dp_sink_alloc(sw, in);
3307
3308 if (ret)
3309 tb_sw_warn(sw, "failed to allocate DP resource for port %d\n",
3310 in->port);
3311 else
3312 tb_sw_dbg(sw, "allocated DP resource for port %d\n", in->port);
3313
3314 return ret;
3315}
3316
3317/**
3318 * tb_switch_dealloc_dp_resource() - De-allocate DP resource
3319 * @sw: Switch whose DP resource is de-allocated
3320 * @in: DP IN port
3321 *
3322 * De-allocates DP resource that was previously allocated for DP
3323 * tunneling.
3324 */
3325void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
3326{
3327 int ret;
3328
3329 if (tb_switch_is_usb4(sw))
3330 ret = usb4_switch_dealloc_dp_resource(sw, in);
3331 else
3332 ret = tb_lc_dp_sink_dealloc(sw, in);
3333
3334 if (ret)
3335 tb_sw_warn(sw, "failed to de-allocate DP resource for port %d\n",
3336 in->port);
3337 else
3338 tb_sw_dbg(sw, "released DP resource for port %d\n", in->port);
3339}
3340
3341struct tb_sw_lookup {
3342 struct tb *tb;
3343 u8 link;
3344 u8 depth;
3345 const uuid_t *uuid;
3346 u64 route;
3347};
3348
3349static int tb_switch_match(struct device *dev, const void *data)
3350{
3351 struct tb_switch *sw = tb_to_switch(dev);
3352 const struct tb_sw_lookup *lookup = data;
3353
3354 if (!sw)
3355 return 0;
3356 if (sw->tb != lookup->tb)
3357 return 0;
3358
3359 if (lookup->uuid)
3360 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
3361
3362 if (lookup->route) {
3363 return sw->config.route_lo == lower_32_bits(lookup->route) &&
3364 sw->config.route_hi == upper_32_bits(lookup->route);
3365 }
3366
3367 /* Root switch is matched only by depth */
3368 if (!lookup->depth)
3369 return !sw->depth;
3370
3371 return sw->link == lookup->link && sw->depth == lookup->depth;
3372}
3373
3374/**
3375 * tb_switch_find_by_link_depth() - Find switch by link and depth
3376 * @tb: Domain the switch belongs
3377 * @link: Link number the switch is connected
3378 * @depth: Depth of the switch in link
3379 *
3380 * Returned switch has reference count increased so the caller needs to
3381 * call tb_switch_put() when done with the switch.
3382 */
3383struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
3384{
3385 struct tb_sw_lookup lookup;
3386 struct device *dev;
3387
3388 memset(&lookup, 0, sizeof(lookup));
3389 lookup.tb = tb;
3390 lookup.link = link;
3391 lookup.depth = depth;
3392
3393 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3394 if (dev)
3395 return tb_to_switch(dev);
3396
3397 return NULL;
3398}
3399
3400/**
3401 * tb_switch_find_by_uuid() - Find switch by UUID
3402 * @tb: Domain the switch belongs
3403 * @uuid: UUID to look for
3404 *
3405 * Returned switch has reference count increased so the caller needs to
3406 * call tb_switch_put() when done with the switch.
3407 */
3408struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
3409{
3410 struct tb_sw_lookup lookup;
3411 struct device *dev;
3412
3413 memset(&lookup, 0, sizeof(lookup));
3414 lookup.tb = tb;
3415 lookup.uuid = uuid;
3416
3417 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3418 if (dev)
3419 return tb_to_switch(dev);
3420
3421 return NULL;
3422}
3423
3424/**
3425 * tb_switch_find_by_route() - Find switch by route string
3426 * @tb: Domain the switch belongs
3427 * @route: Route string to look for
3428 *
3429 * Returned switch has reference count increased so the caller needs to
3430 * call tb_switch_put() when done with the switch.
3431 */
3432struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
3433{
3434 struct tb_sw_lookup lookup;
3435 struct device *dev;
3436
3437 if (!route)
3438 return tb_switch_get(tb->root_switch);
3439
3440 memset(&lookup, 0, sizeof(lookup));
3441 lookup.tb = tb;
3442 lookup.route = route;
3443
3444 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3445 if (dev)
3446 return tb_to_switch(dev);
3447
3448 return NULL;
3449}
3450
3451/**
3452 * tb_switch_find_port() - return the first port of @type on @sw or NULL
3453 * @sw: Switch to find the port from
3454 * @type: Port type to look for
3455 */
3456struct tb_port *tb_switch_find_port(struct tb_switch *sw,
3457 enum tb_port_type type)
3458{
3459 struct tb_port *port;
3460
3461 tb_switch_for_each_port(sw, port) {
3462 if (port->config.type == type)
3463 return port;
3464 }
3465
3466 return NULL;
3467}
3468
3469static int tb_switch_pm_secondary_resolve(struct tb_switch *sw)
3470{
3471 struct tb_switch *parent = tb_switch_parent(sw);
3472 struct tb_port *up, *down;
3473 int ret;
3474
3475 if (!tb_route(sw))
3476 return 0;
3477
3478 up = tb_upstream_port(sw);
3479 down = tb_port_at(tb_route(sw), parent);
3480 ret = tb_port_pm_secondary_enable(up);
3481 if (ret)
3482 return ret;
3483
3484 return tb_port_pm_secondary_disable(down);
3485}
3486
3487static int __tb_switch_enable_clx(struct tb_switch *sw, enum tb_clx clx)
3488{
3489 struct tb_switch *parent = tb_switch_parent(sw);
3490 bool up_clx_support, down_clx_support;
3491 struct tb_port *up, *down;
3492 int ret;
3493
3494 if (!tb_switch_is_clx_supported(sw))
3495 return 0;
3496
3497 /*
3498 * Enable CLx for host router's downstream port as part of the
3499 * downstream router enabling procedure.
3500 */
3501 if (!tb_route(sw))
3502 return 0;
3503
3504 /* Enable CLx only for first hop router (depth = 1) */
3505 if (tb_route(parent))
3506 return 0;
3507
3508 ret = tb_switch_pm_secondary_resolve(sw);
3509 if (ret)
3510 return ret;
3511
3512 up = tb_upstream_port(sw);
3513 down = tb_port_at(tb_route(sw), parent);
3514
3515 up_clx_support = tb_port_clx_supported(up, clx);
3516 down_clx_support = tb_port_clx_supported(down, clx);
3517
3518 tb_port_dbg(up, "%s %ssupported\n", tb_switch_clx_name(clx),
3519 up_clx_support ? "" : "not ");
3520 tb_port_dbg(down, "%s %ssupported\n", tb_switch_clx_name(clx),
3521 down_clx_support ? "" : "not ");
3522
3523 if (!up_clx_support || !down_clx_support)
3524 return -EOPNOTSUPP;
3525
3526 ret = tb_port_clx_enable(up, clx);
3527 if (ret)
3528 return ret;
3529
3530 ret = tb_port_clx_enable(down, clx);
3531 if (ret) {
3532 tb_port_clx_disable(up, clx);
3533 return ret;
3534 }
3535
3536 ret = tb_switch_mask_clx_objections(sw);
3537 if (ret) {
3538 tb_port_clx_disable(up, clx);
3539 tb_port_clx_disable(down, clx);
3540 return ret;
3541 }
3542
3543 sw->clx = clx;
3544
3545 tb_port_dbg(up, "%s enabled\n", tb_switch_clx_name(clx));
3546 return 0;
3547}
3548
3549/**
3550 * tb_switch_enable_clx() - Enable CLx on upstream port of specified router
3551 * @sw: Router to enable CLx for
3552 * @clx: The CLx state to enable
3553 *
3554 * Enable CLx state only for first hop router. That is the most common
3555 * use-case, that is intended for better thermal management, and so helps
3556 * to improve performance. CLx is enabled only if both sides of the link
3557 * support CLx, and if both sides of the link are not configured as two
3558 * single lane links and only if the link is not inter-domain link. The
3559 * complete set of conditions is described in CM Guide 1.0 section 8.1.
3560 *
3561 * Return: Returns 0 on success or an error code on failure.
3562 */
3563int tb_switch_enable_clx(struct tb_switch *sw, enum tb_clx clx)
3564{
3565 struct tb_switch *root_sw = sw->tb->root_switch;
3566
3567 if (!clx_enabled)
3568 return 0;
3569
3570 /*
3571 * CLx is not enabled and validated on Intel USB4 platforms before
3572 * Alder Lake.
3573 */
3574 if (root_sw->generation < 4 || tb_switch_is_tiger_lake(root_sw))
3575 return 0;
3576
3577 switch (clx) {
3578 case TB_CL1:
3579 /* CL0s and CL1 are enabled and supported together */
3580 return __tb_switch_enable_clx(sw, clx);
3581
3582 default:
3583 return -EOPNOTSUPP;
3584 }
3585}
3586
3587static int __tb_switch_disable_clx(struct tb_switch *sw, enum tb_clx clx)
3588{
3589 struct tb_switch *parent = tb_switch_parent(sw);
3590 struct tb_port *up, *down;
3591 int ret;
3592
3593 if (!tb_switch_is_clx_supported(sw))
3594 return 0;
3595
3596 /*
3597 * Disable CLx for host router's downstream port as part of the
3598 * downstream router enabling procedure.
3599 */
3600 if (!tb_route(sw))
3601 return 0;
3602
3603 /* Disable CLx only for first hop router (depth = 1) */
3604 if (tb_route(parent))
3605 return 0;
3606
3607 up = tb_upstream_port(sw);
3608 down = tb_port_at(tb_route(sw), parent);
3609 ret = tb_port_clx_disable(up, clx);
3610 if (ret)
3611 return ret;
3612
3613 ret = tb_port_clx_disable(down, clx);
3614 if (ret)
3615 return ret;
3616
3617 sw->clx = TB_CLX_DISABLE;
3618
3619 tb_port_dbg(up, "%s disabled\n", tb_switch_clx_name(clx));
3620 return 0;
3621}
3622
3623/**
3624 * tb_switch_disable_clx() - Disable CLx on upstream port of specified router
3625 * @sw: Router to disable CLx for
3626 * @clx: The CLx state to disable
3627 *
3628 * Return: Returns 0 on success or an error code on failure.
3629 */
3630int tb_switch_disable_clx(struct tb_switch *sw, enum tb_clx clx)
3631{
3632 if (!clx_enabled)
3633 return 0;
3634
3635 switch (clx) {
3636 case TB_CL1:
3637 /* CL0s and CL1 are enabled and supported together */
3638 return __tb_switch_disable_clx(sw, clx);
3639
3640 default:
3641 return -EOPNOTSUPP;
3642 }
3643}
3644
3645/**
3646 * tb_switch_mask_clx_objections() - Mask CLx objections for a router
3647 * @sw: Router to mask objections for
3648 *
3649 * Mask the objections coming from the second depth routers in order to
3650 * stop these objections from interfering with the CLx states of the first
3651 * depth link.
3652 */
3653int tb_switch_mask_clx_objections(struct tb_switch *sw)
3654{
3655 int up_port = sw->config.upstream_port_number;
3656 u32 offset, val[2], mask_obj, unmask_obj;
3657 int ret, i;
3658
3659 /* Only Titan Ridge of pre-USB4 devices support CLx states */
3660 if (!tb_switch_is_titan_ridge(sw))
3661 return 0;
3662
3663 if (!tb_route(sw))
3664 return 0;
3665
3666 /*
3667 * In Titan Ridge there are only 2 dual-lane Thunderbolt ports:
3668 * Port A consists of lane adapters 1,2 and
3669 * Port B consists of lane adapters 3,4
3670 * If upstream port is A, (lanes are 1,2), we mask objections from
3671 * port B (lanes 3,4) and unmask objections from Port A and vice-versa.
3672 */
3673 if (up_port == 1) {
3674 mask_obj = TB_LOW_PWR_C0_PORT_B_MASK;
3675 unmask_obj = TB_LOW_PWR_C1_PORT_A_MASK;
3676 offset = TB_LOW_PWR_C1_CL1;
3677 } else {
3678 mask_obj = TB_LOW_PWR_C1_PORT_A_MASK;
3679 unmask_obj = TB_LOW_PWR_C0_PORT_B_MASK;
3680 offset = TB_LOW_PWR_C3_CL1;
3681 }
3682
3683 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH,
3684 sw->cap_lp + offset, ARRAY_SIZE(val));
3685 if (ret)
3686 return ret;
3687
3688 for (i = 0; i < ARRAY_SIZE(val); i++) {
3689 val[i] |= mask_obj;
3690 val[i] &= ~unmask_obj;
3691 }
3692
3693 return tb_sw_write(sw, &val, TB_CFG_SWITCH,
3694 sw->cap_lp + offset, ARRAY_SIZE(val));
3695}
3696
3697/*
3698 * Can be used for read/write a specified PCIe bridge for any Thunderbolt 3
3699 * device. For now used only for Titan Ridge.
3700 */
3701static int tb_switch_pcie_bridge_write(struct tb_switch *sw, unsigned int bridge,
3702 unsigned int pcie_offset, u32 value)
3703{
3704 u32 offset, command, val;
3705 int ret;
3706
3707 if (sw->generation != 3)
3708 return -EOPNOTSUPP;
3709
3710 offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_WR_DATA;
3711 ret = tb_sw_write(sw, &value, TB_CFG_SWITCH, offset, 1);
3712 if (ret)
3713 return ret;
3714
3715 command = pcie_offset & TB_PLUG_EVENTS_PCIE_CMD_DW_OFFSET_MASK;
3716 command |= BIT(bridge + TB_PLUG_EVENTS_PCIE_CMD_BR_SHIFT);
3717 command |= TB_PLUG_EVENTS_PCIE_CMD_RD_WR_MASK;
3718 command |= TB_PLUG_EVENTS_PCIE_CMD_COMMAND_VAL
3719 << TB_PLUG_EVENTS_PCIE_CMD_COMMAND_SHIFT;
3720 command |= TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK;
3721
3722 offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_CMD;
3723
3724 ret = tb_sw_write(sw, &command, TB_CFG_SWITCH, offset, 1);
3725 if (ret)
3726 return ret;
3727
3728 ret = tb_switch_wait_for_bit(sw, offset,
3729 TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK, 0, 100);
3730 if (ret)
3731 return ret;
3732
3733 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
3734 if (ret)
3735 return ret;
3736
3737 if (val & TB_PLUG_EVENTS_PCIE_CMD_TIMEOUT_MASK)
3738 return -ETIMEDOUT;
3739
3740 return 0;
3741}
3742
3743/**
3744 * tb_switch_pcie_l1_enable() - Enable PCIe link to enter L1 state
3745 * @sw: Router to enable PCIe L1
3746 *
3747 * For Titan Ridge switch to enter CLx state, its PCIe bridges shall enable
3748 * entry to PCIe L1 state. Shall be called after the upstream PCIe tunnel
3749 * was configured. Due to Intel platforms limitation, shall be called only
3750 * for first hop switch.
3751 */
3752int tb_switch_pcie_l1_enable(struct tb_switch *sw)
3753{
3754 struct tb_switch *parent = tb_switch_parent(sw);
3755 int ret;
3756
3757 if (!tb_route(sw))
3758 return 0;
3759
3760 if (!tb_switch_is_titan_ridge(sw))
3761 return 0;
3762
3763 /* Enable PCIe L1 enable only for first hop router (depth = 1) */
3764 if (tb_route(parent))
3765 return 0;
3766
3767 /* Write to downstream PCIe bridge #5 aka Dn4 */
3768 ret = tb_switch_pcie_bridge_write(sw, 5, 0x143, 0x0c7806b1);
3769 if (ret)
3770 return ret;
3771
3772 /* Write to Upstream PCIe bridge #0 aka Up0 */
3773 return tb_switch_pcie_bridge_write(sw, 0, 0x143, 0x0c5806b1);
3774}
3775
3776/**
3777 * tb_switch_xhci_connect() - Connect internal xHCI
3778 * @sw: Router whose xHCI to connect
3779 *
3780 * Can be called to any router. For Alpine Ridge and Titan Ridge
3781 * performs special flows that bring the xHCI functional for any device
3782 * connected to the type-C port. Call only after PCIe tunnel has been
3783 * established. The function only does the connect if not done already
3784 * so can be called several times for the same router.
3785 */
3786int tb_switch_xhci_connect(struct tb_switch *sw)
3787{
3788 struct tb_port *port1, *port3;
3789 int ret;
3790
3791 if (sw->generation != 3)
3792 return 0;
3793
3794 port1 = &sw->ports[1];
3795 port3 = &sw->ports[3];
3796
3797 if (tb_switch_is_alpine_ridge(sw)) {
3798 bool usb_port1, usb_port3, xhci_port1, xhci_port3;
3799
3800 usb_port1 = tb_lc_is_usb_plugged(port1);
3801 usb_port3 = tb_lc_is_usb_plugged(port3);
3802 xhci_port1 = tb_lc_is_xhci_connected(port1);
3803 xhci_port3 = tb_lc_is_xhci_connected(port3);
3804
3805 /* Figure out correct USB port to connect */
3806 if (usb_port1 && !xhci_port1) {
3807 ret = tb_lc_xhci_connect(port1);
3808 if (ret)
3809 return ret;
3810 }
3811 if (usb_port3 && !xhci_port3)
3812 return tb_lc_xhci_connect(port3);
3813 } else if (tb_switch_is_titan_ridge(sw)) {
3814 ret = tb_lc_xhci_connect(port1);
3815 if (ret)
3816 return ret;
3817 return tb_lc_xhci_connect(port3);
3818 }
3819
3820 return 0;
3821}
3822
3823/**
3824 * tb_switch_xhci_disconnect() - Disconnect internal xHCI
3825 * @sw: Router whose xHCI to disconnect
3826 *
3827 * The opposite of tb_switch_xhci_connect(). Disconnects xHCI on both
3828 * ports.
3829 */
3830void tb_switch_xhci_disconnect(struct tb_switch *sw)
3831{
3832 if (sw->generation == 3) {
3833 struct tb_port *port1 = &sw->ports[1];
3834 struct tb_port *port3 = &sw->ports[3];
3835
3836 tb_lc_xhci_disconnect(port1);
3837 tb_port_dbg(port1, "disconnected xHCI\n");
3838 tb_lc_xhci_disconnect(port3);
3839 tb_port_dbg(port3, "disconnected xHCI\n");
3840 }
3841}