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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Thunderbolt Cactus Ridge driver - switch/port utility functions
4 *
5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
6 */
7
8#include <linux/delay.h>
9#include <linux/idr.h>
10#include <linux/nvmem-provider.h>
11#include <linux/sizes.h>
12#include <linux/slab.h>
13#include <linux/vmalloc.h>
14
15#include "tb.h"
16
17/* Switch authorization from userspace is serialized by this lock */
18static DEFINE_MUTEX(switch_lock);
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
240 return dma_port_flash_read(sw->dma_port, offset, val, bytes);
241}
242
243static int tb_switch_nvm_write(void *priv, unsigned int offset, void *val,
244 size_t bytes)
245{
246 struct tb_switch *sw = priv;
247 int ret = 0;
248
249 if (mutex_lock_interruptible(&switch_lock))
250 return -ERESTARTSYS;
251
252 /*
253 * Since writing the NVM image might require some special steps,
254 * for example when CSS headers are written, we cache the image
255 * locally here and handle the special cases when the user asks
256 * us to authenticate the image.
257 */
258 if (!sw->nvm->buf) {
259 sw->nvm->buf = vmalloc(NVM_MAX_SIZE);
260 if (!sw->nvm->buf) {
261 ret = -ENOMEM;
262 goto unlock;
263 }
264 }
265
266 sw->nvm->buf_data_size = offset + bytes;
267 memcpy(sw->nvm->buf + offset, val, bytes);
268
269unlock:
270 mutex_unlock(&switch_lock);
271
272 return ret;
273}
274
275static struct nvmem_device *register_nvmem(struct tb_switch *sw, int id,
276 size_t size, bool active)
277{
278 struct nvmem_config config;
279
280 memset(&config, 0, sizeof(config));
281
282 if (active) {
283 config.name = "nvm_active";
284 config.reg_read = tb_switch_nvm_read;
285 config.read_only = true;
286 } else {
287 config.name = "nvm_non_active";
288 config.reg_write = tb_switch_nvm_write;
289 config.root_only = true;
290 }
291
292 config.id = id;
293 config.stride = 4;
294 config.word_size = 4;
295 config.size = size;
296 config.dev = &sw->dev;
297 config.owner = THIS_MODULE;
298 config.priv = sw;
299
300 return nvmem_register(&config);
301}
302
303static int tb_switch_nvm_add(struct tb_switch *sw)
304{
305 struct nvmem_device *nvm_dev;
306 struct tb_switch_nvm *nvm;
307 u32 val;
308 int ret;
309
310 if (!sw->dma_port)
311 return 0;
312
313 nvm = kzalloc(sizeof(*nvm), GFP_KERNEL);
314 if (!nvm)
315 return -ENOMEM;
316
317 nvm->id = ida_simple_get(&nvm_ida, 0, 0, GFP_KERNEL);
318
319 /*
320 * If the switch is in safe-mode the only accessible portion of
321 * the NVM is the non-active one where userspace is expected to
322 * write new functional NVM.
323 */
324 if (!sw->safe_mode) {
325 u32 nvm_size, hdr_size;
326
327 ret = dma_port_flash_read(sw->dma_port, NVM_FLASH_SIZE, &val,
328 sizeof(val));
329 if (ret)
330 goto err_ida;
331
332 hdr_size = sw->generation < 3 ? SZ_8K : SZ_16K;
333 nvm_size = (SZ_1M << (val & 7)) / 8;
334 nvm_size = (nvm_size - hdr_size) / 2;
335
336 ret = dma_port_flash_read(sw->dma_port, NVM_VERSION, &val,
337 sizeof(val));
338 if (ret)
339 goto err_ida;
340
341 nvm->major = val >> 16;
342 nvm->minor = val >> 8;
343
344 nvm_dev = register_nvmem(sw, nvm->id, nvm_size, true);
345 if (IS_ERR(nvm_dev)) {
346 ret = PTR_ERR(nvm_dev);
347 goto err_ida;
348 }
349 nvm->active = nvm_dev;
350 }
351
352 nvm_dev = register_nvmem(sw, nvm->id, NVM_MAX_SIZE, false);
353 if (IS_ERR(nvm_dev)) {
354 ret = PTR_ERR(nvm_dev);
355 goto err_nvm_active;
356 }
357 nvm->non_active = nvm_dev;
358
359 mutex_lock(&switch_lock);
360 sw->nvm = nvm;
361 mutex_unlock(&switch_lock);
362
363 return 0;
364
365err_nvm_active:
366 if (nvm->active)
367 nvmem_unregister(nvm->active);
368err_ida:
369 ida_simple_remove(&nvm_ida, nvm->id);
370 kfree(nvm);
371
372 return ret;
373}
374
375static void tb_switch_nvm_remove(struct tb_switch *sw)
376{
377 struct tb_switch_nvm *nvm;
378
379 mutex_lock(&switch_lock);
380 nvm = sw->nvm;
381 sw->nvm = NULL;
382 mutex_unlock(&switch_lock);
383
384 if (!nvm)
385 return;
386
387 /* Remove authentication status in case the switch is unplugged */
388 if (!nvm->authenticating)
389 nvm_clear_auth_status(sw);
390
391 nvmem_unregister(nvm->non_active);
392 if (nvm->active)
393 nvmem_unregister(nvm->active);
394 ida_simple_remove(&nvm_ida, nvm->id);
395 vfree(nvm->buf);
396 kfree(nvm);
397}
398
399/* port utility functions */
400
401static const char *tb_port_type(struct tb_regs_port_header *port)
402{
403 switch (port->type >> 16) {
404 case 0:
405 switch ((u8) port->type) {
406 case 0:
407 return "Inactive";
408 case 1:
409 return "Port";
410 case 2:
411 return "NHI";
412 default:
413 return "unknown";
414 }
415 case 0x2:
416 return "Ethernet";
417 case 0x8:
418 return "SATA";
419 case 0xe:
420 return "DP/HDMI";
421 case 0x10:
422 return "PCIe";
423 case 0x20:
424 return "USB";
425 default:
426 return "unknown";
427 }
428}
429
430static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
431{
432 tb_info(tb,
433 " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
434 port->port_number, port->vendor_id, port->device_id,
435 port->revision, port->thunderbolt_version, tb_port_type(port),
436 port->type);
437 tb_info(tb, " Max hop id (in/out): %d/%d\n",
438 port->max_in_hop_id, port->max_out_hop_id);
439 tb_info(tb, " Max counters: %d\n", port->max_counters);
440 tb_info(tb, " NFC Credits: %#x\n", port->nfc_credits);
441}
442
443/**
444 * tb_port_state() - get connectedness state of a port
445 *
446 * The port must have a TB_CAP_PHY (i.e. it should be a real port).
447 *
448 * Return: Returns an enum tb_port_state on success or an error code on failure.
449 */
450static int tb_port_state(struct tb_port *port)
451{
452 struct tb_cap_phy phy;
453 int res;
454 if (port->cap_phy == 0) {
455 tb_port_WARN(port, "does not have a PHY\n");
456 return -EINVAL;
457 }
458 res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
459 if (res)
460 return res;
461 return phy.state;
462}
463
464/**
465 * tb_wait_for_port() - wait for a port to become ready
466 *
467 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
468 * wait_if_unplugged is set then we also wait if the port is in state
469 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
470 * switch resume). Otherwise we only wait if a device is registered but the link
471 * has not yet been established.
472 *
473 * Return: Returns an error code on failure. Returns 0 if the port is not
474 * connected or failed to reach state TB_PORT_UP within one second. Returns 1
475 * if the port is connected and in state TB_PORT_UP.
476 */
477int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
478{
479 int retries = 10;
480 int state;
481 if (!port->cap_phy) {
482 tb_port_WARN(port, "does not have PHY\n");
483 return -EINVAL;
484 }
485 if (tb_is_upstream_port(port)) {
486 tb_port_WARN(port, "is the upstream port\n");
487 return -EINVAL;
488 }
489
490 while (retries--) {
491 state = tb_port_state(port);
492 if (state < 0)
493 return state;
494 if (state == TB_PORT_DISABLED) {
495 tb_port_info(port, "is disabled (state: 0)\n");
496 return 0;
497 }
498 if (state == TB_PORT_UNPLUGGED) {
499 if (wait_if_unplugged) {
500 /* used during resume */
501 tb_port_info(port,
502 "is unplugged (state: 7), retrying...\n");
503 msleep(100);
504 continue;
505 }
506 tb_port_info(port, "is unplugged (state: 7)\n");
507 return 0;
508 }
509 if (state == TB_PORT_UP) {
510 tb_port_info(port,
511 "is connected, link is up (state: 2)\n");
512 return 1;
513 }
514
515 /*
516 * After plug-in the state is TB_PORT_CONNECTING. Give it some
517 * time.
518 */
519 tb_port_info(port,
520 "is connected, link is not up (state: %d), retrying...\n",
521 state);
522 msleep(100);
523 }
524 tb_port_warn(port,
525 "failed to reach state TB_PORT_UP. Ignoring port...\n");
526 return 0;
527}
528
529/**
530 * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
531 *
532 * Change the number of NFC credits allocated to @port by @credits. To remove
533 * NFC credits pass a negative amount of credits.
534 *
535 * Return: Returns 0 on success or an error code on failure.
536 */
537int tb_port_add_nfc_credits(struct tb_port *port, int credits)
538{
539 if (credits == 0)
540 return 0;
541 tb_port_info(port,
542 "adding %#x NFC credits (%#x -> %#x)",
543 credits,
544 port->config.nfc_credits,
545 port->config.nfc_credits + credits);
546 port->config.nfc_credits += credits;
547 return tb_port_write(port, &port->config.nfc_credits,
548 TB_CFG_PORT, 4, 1);
549}
550
551/**
552 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
553 *
554 * Return: Returns 0 on success or an error code on failure.
555 */
556int tb_port_clear_counter(struct tb_port *port, int counter)
557{
558 u32 zero[3] = { 0, 0, 0 };
559 tb_port_info(port, "clearing counter %d\n", counter);
560 return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
561}
562
563/**
564 * tb_init_port() - initialize a port
565 *
566 * This is a helper method for tb_switch_alloc. Does not check or initialize
567 * any downstream switches.
568 *
569 * Return: Returns 0 on success or an error code on failure.
570 */
571static int tb_init_port(struct tb_port *port)
572{
573 int res;
574 int cap;
575
576 res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
577 if (res)
578 return res;
579
580 /* Port 0 is the switch itself and has no PHY. */
581 if (port->config.type == TB_TYPE_PORT && port->port != 0) {
582 cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
583
584 if (cap > 0)
585 port->cap_phy = cap;
586 else
587 tb_port_WARN(port, "non switch port without a PHY\n");
588 }
589
590 tb_dump_port(port->sw->tb, &port->config);
591
592 /* TODO: Read dual link port, DP port and more from EEPROM. */
593 return 0;
594
595}
596
597/* switch utility functions */
598
599static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
600{
601 tb_info(tb,
602 " Switch: %x:%x (Revision: %d, TB Version: %d)\n",
603 sw->vendor_id, sw->device_id, sw->revision,
604 sw->thunderbolt_version);
605 tb_info(tb, " Max Port Number: %d\n", sw->max_port_number);
606 tb_info(tb, " Config:\n");
607 tb_info(tb,
608 " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
609 sw->upstream_port_number, sw->depth,
610 (((u64) sw->route_hi) << 32) | sw->route_lo,
611 sw->enabled, sw->plug_events_delay);
612 tb_info(tb,
613 " unknown1: %#x unknown4: %#x\n",
614 sw->__unknown1, sw->__unknown4);
615}
616
617/**
618 * reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET
619 *
620 * Return: Returns 0 on success or an error code on failure.
621 */
622int tb_switch_reset(struct tb *tb, u64 route)
623{
624 struct tb_cfg_result res;
625 struct tb_regs_switch_header header = {
626 header.route_hi = route >> 32,
627 header.route_lo = route,
628 header.enabled = true,
629 };
630 tb_info(tb, "resetting switch at %llx\n", route);
631 res.err = tb_cfg_write(tb->ctl, ((u32 *) &header) + 2, route,
632 0, 2, 2, 2);
633 if (res.err)
634 return res.err;
635 res = tb_cfg_reset(tb->ctl, route, TB_CFG_DEFAULT_TIMEOUT);
636 if (res.err > 0)
637 return -EIO;
638 return res.err;
639}
640
641struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route)
642{
643 u8 next_port = route; /*
644 * Routes use a stride of 8 bits,
645 * eventhough a port index has 6 bits at most.
646 * */
647 if (route == 0)
648 return sw;
649 if (next_port > sw->config.max_port_number)
650 return NULL;
651 if (tb_is_upstream_port(&sw->ports[next_port]))
652 return NULL;
653 if (!sw->ports[next_port].remote)
654 return NULL;
655 return get_switch_at_route(sw->ports[next_port].remote->sw,
656 route >> TB_ROUTE_SHIFT);
657}
658
659/**
660 * tb_plug_events_active() - enable/disable plug events on a switch
661 *
662 * Also configures a sane plug_events_delay of 255ms.
663 *
664 * Return: Returns 0 on success or an error code on failure.
665 */
666static int tb_plug_events_active(struct tb_switch *sw, bool active)
667{
668 u32 data;
669 int res;
670
671 if (!sw->config.enabled)
672 return 0;
673
674 sw->config.plug_events_delay = 0xff;
675 res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
676 if (res)
677 return res;
678
679 res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
680 if (res)
681 return res;
682
683 if (active) {
684 data = data & 0xFFFFFF83;
685 switch (sw->config.device_id) {
686 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
687 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
688 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
689 break;
690 default:
691 data |= 4;
692 }
693 } else {
694 data = data | 0x7c;
695 }
696 return tb_sw_write(sw, &data, TB_CFG_SWITCH,
697 sw->cap_plug_events + 1, 1);
698}
699
700static ssize_t authorized_show(struct device *dev,
701 struct device_attribute *attr,
702 char *buf)
703{
704 struct tb_switch *sw = tb_to_switch(dev);
705
706 return sprintf(buf, "%u\n", sw->authorized);
707}
708
709static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
710{
711 int ret = -EINVAL;
712
713 if (mutex_lock_interruptible(&switch_lock))
714 return -ERESTARTSYS;
715
716 if (sw->authorized)
717 goto unlock;
718
719 /*
720 * Make sure there is no PCIe rescan ongoing when a new PCIe
721 * tunnel is created. Otherwise the PCIe rescan code might find
722 * the new tunnel too early.
723 */
724 pci_lock_rescan_remove();
725
726 switch (val) {
727 /* Approve switch */
728 case 1:
729 if (sw->key)
730 ret = tb_domain_approve_switch_key(sw->tb, sw);
731 else
732 ret = tb_domain_approve_switch(sw->tb, sw);
733 break;
734
735 /* Challenge switch */
736 case 2:
737 if (sw->key)
738 ret = tb_domain_challenge_switch_key(sw->tb, sw);
739 break;
740
741 default:
742 break;
743 }
744
745 pci_unlock_rescan_remove();
746
747 if (!ret) {
748 sw->authorized = val;
749 /* Notify status change to the userspace */
750 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
751 }
752
753unlock:
754 mutex_unlock(&switch_lock);
755 return ret;
756}
757
758static ssize_t authorized_store(struct device *dev,
759 struct device_attribute *attr,
760 const char *buf, size_t count)
761{
762 struct tb_switch *sw = tb_to_switch(dev);
763 unsigned int val;
764 ssize_t ret;
765
766 ret = kstrtouint(buf, 0, &val);
767 if (ret)
768 return ret;
769 if (val > 2)
770 return -EINVAL;
771
772 ret = tb_switch_set_authorized(sw, val);
773
774 return ret ? ret : count;
775}
776static DEVICE_ATTR_RW(authorized);
777
778static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
779 char *buf)
780{
781 struct tb_switch *sw = tb_to_switch(dev);
782
783 return sprintf(buf, "%u\n", sw->boot);
784}
785static DEVICE_ATTR_RO(boot);
786
787static ssize_t device_show(struct device *dev, struct device_attribute *attr,
788 char *buf)
789{
790 struct tb_switch *sw = tb_to_switch(dev);
791
792 return sprintf(buf, "%#x\n", sw->device);
793}
794static DEVICE_ATTR_RO(device);
795
796static ssize_t
797device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
798{
799 struct tb_switch *sw = tb_to_switch(dev);
800
801 return sprintf(buf, "%s\n", sw->device_name ? sw->device_name : "");
802}
803static DEVICE_ATTR_RO(device_name);
804
805static ssize_t key_show(struct device *dev, struct device_attribute *attr,
806 char *buf)
807{
808 struct tb_switch *sw = tb_to_switch(dev);
809 ssize_t ret;
810
811 if (mutex_lock_interruptible(&switch_lock))
812 return -ERESTARTSYS;
813
814 if (sw->key)
815 ret = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
816 else
817 ret = sprintf(buf, "\n");
818
819 mutex_unlock(&switch_lock);
820 return ret;
821}
822
823static ssize_t key_store(struct device *dev, struct device_attribute *attr,
824 const char *buf, size_t count)
825{
826 struct tb_switch *sw = tb_to_switch(dev);
827 u8 key[TB_SWITCH_KEY_SIZE];
828 ssize_t ret = count;
829 bool clear = false;
830
831 if (!strcmp(buf, "\n"))
832 clear = true;
833 else if (hex2bin(key, buf, sizeof(key)))
834 return -EINVAL;
835
836 if (mutex_lock_interruptible(&switch_lock))
837 return -ERESTARTSYS;
838
839 if (sw->authorized) {
840 ret = -EBUSY;
841 } else {
842 kfree(sw->key);
843 if (clear) {
844 sw->key = NULL;
845 } else {
846 sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
847 if (!sw->key)
848 ret = -ENOMEM;
849 }
850 }
851
852 mutex_unlock(&switch_lock);
853 return ret;
854}
855static DEVICE_ATTR(key, 0600, key_show, key_store);
856
857static ssize_t nvm_authenticate_show(struct device *dev,
858 struct device_attribute *attr, char *buf)
859{
860 struct tb_switch *sw = tb_to_switch(dev);
861 u32 status;
862
863 nvm_get_auth_status(sw, &status);
864 return sprintf(buf, "%#x\n", status);
865}
866
867static ssize_t nvm_authenticate_store(struct device *dev,
868 struct device_attribute *attr, const char *buf, size_t count)
869{
870 struct tb_switch *sw = tb_to_switch(dev);
871 bool val;
872 int ret;
873
874 if (mutex_lock_interruptible(&switch_lock))
875 return -ERESTARTSYS;
876
877 /* If NVMem devices are not yet added */
878 if (!sw->nvm) {
879 ret = -EAGAIN;
880 goto exit_unlock;
881 }
882
883 ret = kstrtobool(buf, &val);
884 if (ret)
885 goto exit_unlock;
886
887 /* Always clear the authentication status */
888 nvm_clear_auth_status(sw);
889
890 if (val) {
891 ret = nvm_validate_and_write(sw);
892 if (ret)
893 goto exit_unlock;
894
895 sw->nvm->authenticating = true;
896
897 if (!tb_route(sw))
898 ret = nvm_authenticate_host(sw);
899 else
900 ret = nvm_authenticate_device(sw);
901 }
902
903exit_unlock:
904 mutex_unlock(&switch_lock);
905
906 if (ret)
907 return ret;
908 return count;
909}
910static DEVICE_ATTR_RW(nvm_authenticate);
911
912static ssize_t nvm_version_show(struct device *dev,
913 struct device_attribute *attr, char *buf)
914{
915 struct tb_switch *sw = tb_to_switch(dev);
916 int ret;
917
918 if (mutex_lock_interruptible(&switch_lock))
919 return -ERESTARTSYS;
920
921 if (sw->safe_mode)
922 ret = -ENODATA;
923 else if (!sw->nvm)
924 ret = -EAGAIN;
925 else
926 ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
927
928 mutex_unlock(&switch_lock);
929
930 return ret;
931}
932static DEVICE_ATTR_RO(nvm_version);
933
934static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
935 char *buf)
936{
937 struct tb_switch *sw = tb_to_switch(dev);
938
939 return sprintf(buf, "%#x\n", sw->vendor);
940}
941static DEVICE_ATTR_RO(vendor);
942
943static ssize_t
944vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
945{
946 struct tb_switch *sw = tb_to_switch(dev);
947
948 return sprintf(buf, "%s\n", sw->vendor_name ? sw->vendor_name : "");
949}
950static DEVICE_ATTR_RO(vendor_name);
951
952static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
953 char *buf)
954{
955 struct tb_switch *sw = tb_to_switch(dev);
956
957 return sprintf(buf, "%pUb\n", sw->uuid);
958}
959static DEVICE_ATTR_RO(unique_id);
960
961static struct attribute *switch_attrs[] = {
962 &dev_attr_authorized.attr,
963 &dev_attr_boot.attr,
964 &dev_attr_device.attr,
965 &dev_attr_device_name.attr,
966 &dev_attr_key.attr,
967 &dev_attr_nvm_authenticate.attr,
968 &dev_attr_nvm_version.attr,
969 &dev_attr_vendor.attr,
970 &dev_attr_vendor_name.attr,
971 &dev_attr_unique_id.attr,
972 NULL,
973};
974
975static umode_t switch_attr_is_visible(struct kobject *kobj,
976 struct attribute *attr, int n)
977{
978 struct device *dev = container_of(kobj, struct device, kobj);
979 struct tb_switch *sw = tb_to_switch(dev);
980
981 if (attr == &dev_attr_key.attr) {
982 if (tb_route(sw) &&
983 sw->tb->security_level == TB_SECURITY_SECURE &&
984 sw->security_level == TB_SECURITY_SECURE)
985 return attr->mode;
986 return 0;
987 } else if (attr == &dev_attr_nvm_authenticate.attr ||
988 attr == &dev_attr_nvm_version.attr) {
989 if (sw->dma_port)
990 return attr->mode;
991 return 0;
992 } else if (attr == &dev_attr_boot.attr) {
993 if (tb_route(sw))
994 return attr->mode;
995 return 0;
996 }
997
998 return sw->safe_mode ? 0 : attr->mode;
999}
1000
1001static struct attribute_group switch_group = {
1002 .is_visible = switch_attr_is_visible,
1003 .attrs = switch_attrs,
1004};
1005
1006static const struct attribute_group *switch_groups[] = {
1007 &switch_group,
1008 NULL,
1009};
1010
1011static void tb_switch_release(struct device *dev)
1012{
1013 struct tb_switch *sw = tb_to_switch(dev);
1014
1015 dma_port_free(sw->dma_port);
1016
1017 kfree(sw->uuid);
1018 kfree(sw->device_name);
1019 kfree(sw->vendor_name);
1020 kfree(sw->ports);
1021 kfree(sw->drom);
1022 kfree(sw->key);
1023 kfree(sw);
1024}
1025
1026struct device_type tb_switch_type = {
1027 .name = "thunderbolt_device",
1028 .release = tb_switch_release,
1029};
1030
1031static int tb_switch_get_generation(struct tb_switch *sw)
1032{
1033 switch (sw->config.device_id) {
1034 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1035 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1036 case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
1037 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
1038 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
1039 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1040 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
1041 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
1042 return 1;
1043
1044 case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
1045 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
1046 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
1047 return 2;
1048
1049 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
1050 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
1051 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
1052 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
1053 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
1054 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
1055 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
1056 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
1057 return 3;
1058
1059 default:
1060 /*
1061 * For unknown switches assume generation to be 1 to be
1062 * on the safe side.
1063 */
1064 tb_sw_warn(sw, "unsupported switch device id %#x\n",
1065 sw->config.device_id);
1066 return 1;
1067 }
1068}
1069
1070/**
1071 * tb_switch_alloc() - allocate a switch
1072 * @tb: Pointer to the owning domain
1073 * @parent: Parent device for this switch
1074 * @route: Route string for this switch
1075 *
1076 * Allocates and initializes a switch. Will not upload configuration to
1077 * the switch. For that you need to call tb_switch_configure()
1078 * separately. The returned switch should be released by calling
1079 * tb_switch_put().
1080 *
1081 * Return: Pointer to the allocated switch or %NULL in case of failure
1082 */
1083struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
1084 u64 route)
1085{
1086 int i;
1087 int cap;
1088 struct tb_switch *sw;
1089 int upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
1090 if (upstream_port < 0)
1091 return NULL;
1092
1093 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
1094 if (!sw)
1095 return NULL;
1096
1097 sw->tb = tb;
1098 if (tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5))
1099 goto err_free_sw_ports;
1100
1101 tb_info(tb, "current switch config:\n");
1102 tb_dump_switch(tb, &sw->config);
1103
1104 /* configure switch */
1105 sw->config.upstream_port_number = upstream_port;
1106 sw->config.depth = tb_route_length(route);
1107 sw->config.route_lo = route;
1108 sw->config.route_hi = route >> 32;
1109 sw->config.enabled = 0;
1110
1111 /* initialize ports */
1112 sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
1113 GFP_KERNEL);
1114 if (!sw->ports)
1115 goto err_free_sw_ports;
1116
1117 for (i = 0; i <= sw->config.max_port_number; i++) {
1118 /* minimum setup for tb_find_cap and tb_drom_read to work */
1119 sw->ports[i].sw = sw;
1120 sw->ports[i].port = i;
1121 }
1122
1123 sw->generation = tb_switch_get_generation(sw);
1124
1125 cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
1126 if (cap < 0) {
1127 tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
1128 goto err_free_sw_ports;
1129 }
1130 sw->cap_plug_events = cap;
1131
1132 /* Root switch is always authorized */
1133 if (!route)
1134 sw->authorized = true;
1135
1136 device_initialize(&sw->dev);
1137 sw->dev.parent = parent;
1138 sw->dev.bus = &tb_bus_type;
1139 sw->dev.type = &tb_switch_type;
1140 sw->dev.groups = switch_groups;
1141 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
1142
1143 return sw;
1144
1145err_free_sw_ports:
1146 kfree(sw->ports);
1147 kfree(sw);
1148
1149 return NULL;
1150}
1151
1152/**
1153 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
1154 * @tb: Pointer to the owning domain
1155 * @parent: Parent device for this switch
1156 * @route: Route string for this switch
1157 *
1158 * This creates a switch in safe mode. This means the switch pretty much
1159 * lacks all capabilities except DMA configuration port before it is
1160 * flashed with a valid NVM firmware.
1161 *
1162 * The returned switch must be released by calling tb_switch_put().
1163 *
1164 * Return: Pointer to the allocated switch or %NULL in case of failure
1165 */
1166struct tb_switch *
1167tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
1168{
1169 struct tb_switch *sw;
1170
1171 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
1172 if (!sw)
1173 return NULL;
1174
1175 sw->tb = tb;
1176 sw->config.depth = tb_route_length(route);
1177 sw->config.route_hi = upper_32_bits(route);
1178 sw->config.route_lo = lower_32_bits(route);
1179 sw->safe_mode = true;
1180
1181 device_initialize(&sw->dev);
1182 sw->dev.parent = parent;
1183 sw->dev.bus = &tb_bus_type;
1184 sw->dev.type = &tb_switch_type;
1185 sw->dev.groups = switch_groups;
1186 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
1187
1188 return sw;
1189}
1190
1191/**
1192 * tb_switch_configure() - Uploads configuration to the switch
1193 * @sw: Switch to configure
1194 *
1195 * Call this function before the switch is added to the system. It will
1196 * upload configuration to the switch and makes it available for the
1197 * connection manager to use.
1198 *
1199 * Return: %0 in case of success and negative errno in case of failure
1200 */
1201int tb_switch_configure(struct tb_switch *sw)
1202{
1203 struct tb *tb = sw->tb;
1204 u64 route;
1205 int ret;
1206
1207 route = tb_route(sw);
1208 tb_info(tb,
1209 "initializing Switch at %#llx (depth: %d, up port: %d)\n",
1210 route, tb_route_length(route), sw->config.upstream_port_number);
1211
1212 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
1213 tb_sw_warn(sw, "unknown switch vendor id %#x\n",
1214 sw->config.vendor_id);
1215
1216 sw->config.enabled = 1;
1217
1218 /* upload configuration */
1219 ret = tb_sw_write(sw, 1 + (u32 *)&sw->config, TB_CFG_SWITCH, 1, 3);
1220 if (ret)
1221 return ret;
1222
1223 return tb_plug_events_active(sw, true);
1224}
1225
1226static void tb_switch_set_uuid(struct tb_switch *sw)
1227{
1228 u32 uuid[4];
1229 int cap;
1230
1231 if (sw->uuid)
1232 return;
1233
1234 /*
1235 * The newer controllers include fused UUID as part of link
1236 * controller specific registers
1237 */
1238 cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
1239 if (cap > 0) {
1240 tb_sw_read(sw, uuid, TB_CFG_SWITCH, cap + 3, 4);
1241 } else {
1242 /*
1243 * ICM generates UUID based on UID and fills the upper
1244 * two words with ones. This is not strictly following
1245 * UUID format but we want to be compatible with it so
1246 * we do the same here.
1247 */
1248 uuid[0] = sw->uid & 0xffffffff;
1249 uuid[1] = (sw->uid >> 32) & 0xffffffff;
1250 uuid[2] = 0xffffffff;
1251 uuid[3] = 0xffffffff;
1252 }
1253
1254 sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
1255}
1256
1257static int tb_switch_add_dma_port(struct tb_switch *sw)
1258{
1259 u32 status;
1260 int ret;
1261
1262 switch (sw->generation) {
1263 case 3:
1264 break;
1265
1266 case 2:
1267 /* Only root switch can be upgraded */
1268 if (tb_route(sw))
1269 return 0;
1270 break;
1271
1272 default:
1273 /*
1274 * DMA port is the only thing available when the switch
1275 * is in safe mode.
1276 */
1277 if (!sw->safe_mode)
1278 return 0;
1279 break;
1280 }
1281
1282 if (sw->no_nvm_upgrade)
1283 return 0;
1284
1285 sw->dma_port = dma_port_alloc(sw);
1286 if (!sw->dma_port)
1287 return 0;
1288
1289 /*
1290 * Check status of the previous flash authentication. If there
1291 * is one we need to power cycle the switch in any case to make
1292 * it functional again.
1293 */
1294 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
1295 if (ret <= 0)
1296 return ret;
1297
1298 if (status) {
1299 tb_sw_info(sw, "switch flash authentication failed\n");
1300 tb_switch_set_uuid(sw);
1301 nvm_set_auth_status(sw, status);
1302 }
1303
1304 tb_sw_info(sw, "power cycling the switch now\n");
1305 dma_port_power_cycle(sw->dma_port);
1306
1307 /*
1308 * We return error here which causes the switch adding failure.
1309 * It should appear back after power cycle is complete.
1310 */
1311 return -ESHUTDOWN;
1312}
1313
1314/**
1315 * tb_switch_add() - Add a switch to the domain
1316 * @sw: Switch to add
1317 *
1318 * This is the last step in adding switch to the domain. It will read
1319 * identification information from DROM and initializes ports so that
1320 * they can be used to connect other switches. The switch will be
1321 * exposed to the userspace when this function successfully returns. To
1322 * remove and release the switch, call tb_switch_remove().
1323 *
1324 * Return: %0 in case of success and negative errno in case of failure
1325 */
1326int tb_switch_add(struct tb_switch *sw)
1327{
1328 int i, ret;
1329
1330 /*
1331 * Initialize DMA control port now before we read DROM. Recent
1332 * host controllers have more complete DROM on NVM that includes
1333 * vendor and model identification strings which we then expose
1334 * to the userspace. NVM can be accessed through DMA
1335 * configuration based mailbox.
1336 */
1337 ret = tb_switch_add_dma_port(sw);
1338 if (ret)
1339 return ret;
1340
1341 if (!sw->safe_mode) {
1342 /* read drom */
1343 ret = tb_drom_read(sw);
1344 if (ret) {
1345 tb_sw_warn(sw, "tb_eeprom_read_rom failed\n");
1346 return ret;
1347 }
1348 tb_sw_info(sw, "uid: %#llx\n", sw->uid);
1349
1350 tb_switch_set_uuid(sw);
1351
1352 for (i = 0; i <= sw->config.max_port_number; i++) {
1353 if (sw->ports[i].disabled) {
1354 tb_port_info(&sw->ports[i], "disabled by eeprom\n");
1355 continue;
1356 }
1357 ret = tb_init_port(&sw->ports[i]);
1358 if (ret)
1359 return ret;
1360 }
1361 }
1362
1363 ret = device_add(&sw->dev);
1364 if (ret)
1365 return ret;
1366
1367 ret = tb_switch_nvm_add(sw);
1368 if (ret)
1369 device_del(&sw->dev);
1370
1371 return ret;
1372}
1373
1374/**
1375 * tb_switch_remove() - Remove and release a switch
1376 * @sw: Switch to remove
1377 *
1378 * This will remove the switch from the domain and release it after last
1379 * reference count drops to zero. If there are switches connected below
1380 * this switch, they will be removed as well.
1381 */
1382void tb_switch_remove(struct tb_switch *sw)
1383{
1384 int i;
1385
1386 /* port 0 is the switch itself and never has a remote */
1387 for (i = 1; i <= sw->config.max_port_number; i++) {
1388 if (tb_is_upstream_port(&sw->ports[i]))
1389 continue;
1390 if (sw->ports[i].remote)
1391 tb_switch_remove(sw->ports[i].remote->sw);
1392 sw->ports[i].remote = NULL;
1393 if (sw->ports[i].xdomain)
1394 tb_xdomain_remove(sw->ports[i].xdomain);
1395 sw->ports[i].xdomain = NULL;
1396 }
1397
1398 if (!sw->is_unplugged)
1399 tb_plug_events_active(sw, false);
1400
1401 tb_switch_nvm_remove(sw);
1402 device_unregister(&sw->dev);
1403}
1404
1405/**
1406 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
1407 */
1408void tb_sw_set_unplugged(struct tb_switch *sw)
1409{
1410 int i;
1411 if (sw == sw->tb->root_switch) {
1412 tb_sw_WARN(sw, "cannot unplug root switch\n");
1413 return;
1414 }
1415 if (sw->is_unplugged) {
1416 tb_sw_WARN(sw, "is_unplugged already set\n");
1417 return;
1418 }
1419 sw->is_unplugged = true;
1420 for (i = 0; i <= sw->config.max_port_number; i++) {
1421 if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
1422 tb_sw_set_unplugged(sw->ports[i].remote->sw);
1423 }
1424}
1425
1426int tb_switch_resume(struct tb_switch *sw)
1427{
1428 int i, err;
1429 tb_sw_info(sw, "resuming switch\n");
1430
1431 /*
1432 * Check for UID of the connected switches except for root
1433 * switch which we assume cannot be removed.
1434 */
1435 if (tb_route(sw)) {
1436 u64 uid;
1437
1438 err = tb_drom_read_uid_only(sw, &uid);
1439 if (err) {
1440 tb_sw_warn(sw, "uid read failed\n");
1441 return err;
1442 }
1443 if (sw->uid != uid) {
1444 tb_sw_info(sw,
1445 "changed while suspended (uid %#llx -> %#llx)\n",
1446 sw->uid, uid);
1447 return -ENODEV;
1448 }
1449 }
1450
1451 /* upload configuration */
1452 err = tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3);
1453 if (err)
1454 return err;
1455
1456 err = tb_plug_events_active(sw, true);
1457 if (err)
1458 return err;
1459
1460 /* check for surviving downstream switches */
1461 for (i = 1; i <= sw->config.max_port_number; i++) {
1462 struct tb_port *port = &sw->ports[i];
1463 if (tb_is_upstream_port(port))
1464 continue;
1465 if (!port->remote)
1466 continue;
1467 if (tb_wait_for_port(port, true) <= 0
1468 || tb_switch_resume(port->remote->sw)) {
1469 tb_port_warn(port,
1470 "lost during suspend, disconnecting\n");
1471 tb_sw_set_unplugged(port->remote->sw);
1472 }
1473 }
1474 return 0;
1475}
1476
1477void tb_switch_suspend(struct tb_switch *sw)
1478{
1479 int i, err;
1480 err = tb_plug_events_active(sw, false);
1481 if (err)
1482 return;
1483
1484 for (i = 1; i <= sw->config.max_port_number; i++) {
1485 if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
1486 tb_switch_suspend(sw->ports[i].remote->sw);
1487 }
1488 /*
1489 * TODO: invoke tb_cfg_prepare_to_sleep here? does not seem to have any
1490 * effect?
1491 */
1492}
1493
1494struct tb_sw_lookup {
1495 struct tb *tb;
1496 u8 link;
1497 u8 depth;
1498 const uuid_t *uuid;
1499 u64 route;
1500};
1501
1502static int tb_switch_match(struct device *dev, void *data)
1503{
1504 struct tb_switch *sw = tb_to_switch(dev);
1505 struct tb_sw_lookup *lookup = data;
1506
1507 if (!sw)
1508 return 0;
1509 if (sw->tb != lookup->tb)
1510 return 0;
1511
1512 if (lookup->uuid)
1513 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
1514
1515 if (lookup->route) {
1516 return sw->config.route_lo == lower_32_bits(lookup->route) &&
1517 sw->config.route_hi == upper_32_bits(lookup->route);
1518 }
1519
1520 /* Root switch is matched only by depth */
1521 if (!lookup->depth)
1522 return !sw->depth;
1523
1524 return sw->link == lookup->link && sw->depth == lookup->depth;
1525}
1526
1527/**
1528 * tb_switch_find_by_link_depth() - Find switch by link and depth
1529 * @tb: Domain the switch belongs
1530 * @link: Link number the switch is connected
1531 * @depth: Depth of the switch in link
1532 *
1533 * Returned switch has reference count increased so the caller needs to
1534 * call tb_switch_put() when done with the switch.
1535 */
1536struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
1537{
1538 struct tb_sw_lookup lookup;
1539 struct device *dev;
1540
1541 memset(&lookup, 0, sizeof(lookup));
1542 lookup.tb = tb;
1543 lookup.link = link;
1544 lookup.depth = depth;
1545
1546 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
1547 if (dev)
1548 return tb_to_switch(dev);
1549
1550 return NULL;
1551}
1552
1553/**
1554 * tb_switch_find_by_uuid() - Find switch by UUID
1555 * @tb: Domain the switch belongs
1556 * @uuid: UUID to look for
1557 *
1558 * Returned switch has reference count increased so the caller needs to
1559 * call tb_switch_put() when done with the switch.
1560 */
1561struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
1562{
1563 struct tb_sw_lookup lookup;
1564 struct device *dev;
1565
1566 memset(&lookup, 0, sizeof(lookup));
1567 lookup.tb = tb;
1568 lookup.uuid = uuid;
1569
1570 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
1571 if (dev)
1572 return tb_to_switch(dev);
1573
1574 return NULL;
1575}
1576
1577/**
1578 * tb_switch_find_by_route() - Find switch by route string
1579 * @tb: Domain the switch belongs
1580 * @route: Route string to look for
1581 *
1582 * Returned switch has reference count increased so the caller needs to
1583 * call tb_switch_put() when done with the switch.
1584 */
1585struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
1586{
1587 struct tb_sw_lookup lookup;
1588 struct device *dev;
1589
1590 if (!route)
1591 return tb_switch_get(tb->root_switch);
1592
1593 memset(&lookup, 0, sizeof(lookup));
1594 lookup.tb = tb;
1595 lookup.route = route;
1596
1597 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
1598 if (dev)
1599 return tb_to_switch(dev);
1600
1601 return NULL;
1602}
1603
1604void tb_switch_exit(void)
1605{
1606 ida_destroy(&nvm_ida);
1607}