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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Thunderbolt bus support
4 *
5 * Copyright (C) 2017, Intel Corporation
6 * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
7 */
8
9#include <linux/device.h>
10#include <linux/idr.h>
11#include <linux/module.h>
12#include <linux/pm_runtime.h>
13#include <linux/slab.h>
14#include <linux/random.h>
15#include <crypto/hash.h>
16
17#include "tb.h"
18
19static DEFINE_IDA(tb_domain_ida);
20
21static bool match_service_id(const struct tb_service_id *id,
22 const struct tb_service *svc)
23{
24 if (id->match_flags & TBSVC_MATCH_PROTOCOL_KEY) {
25 if (strcmp(id->protocol_key, svc->key))
26 return false;
27 }
28
29 if (id->match_flags & TBSVC_MATCH_PROTOCOL_ID) {
30 if (id->protocol_id != svc->prtcid)
31 return false;
32 }
33
34 if (id->match_flags & TBSVC_MATCH_PROTOCOL_VERSION) {
35 if (id->protocol_version != svc->prtcvers)
36 return false;
37 }
38
39 if (id->match_flags & TBSVC_MATCH_PROTOCOL_VERSION) {
40 if (id->protocol_revision != svc->prtcrevs)
41 return false;
42 }
43
44 return true;
45}
46
47static const struct tb_service_id *__tb_service_match(struct device *dev,
48 struct device_driver *drv)
49{
50 struct tb_service_driver *driver;
51 const struct tb_service_id *ids;
52 struct tb_service *svc;
53
54 svc = tb_to_service(dev);
55 if (!svc)
56 return NULL;
57
58 driver = container_of(drv, struct tb_service_driver, driver);
59 if (!driver->id_table)
60 return NULL;
61
62 for (ids = driver->id_table; ids->match_flags != 0; ids++) {
63 if (match_service_id(ids, svc))
64 return ids;
65 }
66
67 return NULL;
68}
69
70static int tb_service_match(struct device *dev, struct device_driver *drv)
71{
72 return !!__tb_service_match(dev, drv);
73}
74
75static int tb_service_probe(struct device *dev)
76{
77 struct tb_service *svc = tb_to_service(dev);
78 struct tb_service_driver *driver;
79 const struct tb_service_id *id;
80
81 driver = container_of(dev->driver, struct tb_service_driver, driver);
82 id = __tb_service_match(dev, &driver->driver);
83
84 return driver->probe(svc, id);
85}
86
87static void tb_service_remove(struct device *dev)
88{
89 struct tb_service *svc = tb_to_service(dev);
90 struct tb_service_driver *driver;
91
92 driver = container_of(dev->driver, struct tb_service_driver, driver);
93 if (driver->remove)
94 driver->remove(svc);
95}
96
97static void tb_service_shutdown(struct device *dev)
98{
99 struct tb_service_driver *driver;
100 struct tb_service *svc;
101
102 svc = tb_to_service(dev);
103 if (!svc || !dev->driver)
104 return;
105
106 driver = container_of(dev->driver, struct tb_service_driver, driver);
107 if (driver->shutdown)
108 driver->shutdown(svc);
109}
110
111static const char * const tb_security_names[] = {
112 [TB_SECURITY_NONE] = "none",
113 [TB_SECURITY_USER] = "user",
114 [TB_SECURITY_SECURE] = "secure",
115 [TB_SECURITY_DPONLY] = "dponly",
116 [TB_SECURITY_USBONLY] = "usbonly",
117 [TB_SECURITY_NOPCIE] = "nopcie",
118};
119
120static ssize_t boot_acl_show(struct device *dev, struct device_attribute *attr,
121 char *buf)
122{
123 struct tb *tb = container_of(dev, struct tb, dev);
124 uuid_t *uuids;
125 ssize_t ret;
126 int i;
127
128 uuids = kcalloc(tb->nboot_acl, sizeof(uuid_t), GFP_KERNEL);
129 if (!uuids)
130 return -ENOMEM;
131
132 pm_runtime_get_sync(&tb->dev);
133
134 if (mutex_lock_interruptible(&tb->lock)) {
135 ret = -ERESTARTSYS;
136 goto out;
137 }
138 ret = tb->cm_ops->get_boot_acl(tb, uuids, tb->nboot_acl);
139 if (ret) {
140 mutex_unlock(&tb->lock);
141 goto out;
142 }
143 mutex_unlock(&tb->lock);
144
145 for (ret = 0, i = 0; i < tb->nboot_acl; i++) {
146 if (!uuid_is_null(&uuids[i]))
147 ret += sysfs_emit_at(buf, ret, "%pUb", &uuids[i]);
148
149 ret += sysfs_emit_at(buf, ret, "%s", i < tb->nboot_acl - 1 ? "," : "\n");
150 }
151
152out:
153 pm_runtime_mark_last_busy(&tb->dev);
154 pm_runtime_put_autosuspend(&tb->dev);
155 kfree(uuids);
156
157 return ret;
158}
159
160static ssize_t boot_acl_store(struct device *dev, struct device_attribute *attr,
161 const char *buf, size_t count)
162{
163 struct tb *tb = container_of(dev, struct tb, dev);
164 char *str, *s, *uuid_str;
165 ssize_t ret = 0;
166 uuid_t *acl;
167 int i = 0;
168
169 /*
170 * Make sure the value is not bigger than tb->nboot_acl * UUID
171 * length + commas and optional "\n". Also the smallest allowable
172 * string is tb->nboot_acl * ",".
173 */
174 if (count > (UUID_STRING_LEN + 1) * tb->nboot_acl + 1)
175 return -EINVAL;
176 if (count < tb->nboot_acl - 1)
177 return -EINVAL;
178
179 str = kstrdup(buf, GFP_KERNEL);
180 if (!str)
181 return -ENOMEM;
182
183 acl = kcalloc(tb->nboot_acl, sizeof(uuid_t), GFP_KERNEL);
184 if (!acl) {
185 ret = -ENOMEM;
186 goto err_free_str;
187 }
188
189 uuid_str = strim(str);
190 while ((s = strsep(&uuid_str, ",")) != NULL && i < tb->nboot_acl) {
191 size_t len = strlen(s);
192
193 if (len) {
194 if (len != UUID_STRING_LEN) {
195 ret = -EINVAL;
196 goto err_free_acl;
197 }
198 ret = uuid_parse(s, &acl[i]);
199 if (ret)
200 goto err_free_acl;
201 }
202
203 i++;
204 }
205
206 if (s || i < tb->nboot_acl) {
207 ret = -EINVAL;
208 goto err_free_acl;
209 }
210
211 pm_runtime_get_sync(&tb->dev);
212
213 if (mutex_lock_interruptible(&tb->lock)) {
214 ret = -ERESTARTSYS;
215 goto err_rpm_put;
216 }
217 ret = tb->cm_ops->set_boot_acl(tb, acl, tb->nboot_acl);
218 if (!ret) {
219 /* Notify userspace about the change */
220 kobject_uevent(&tb->dev.kobj, KOBJ_CHANGE);
221 }
222 mutex_unlock(&tb->lock);
223
224err_rpm_put:
225 pm_runtime_mark_last_busy(&tb->dev);
226 pm_runtime_put_autosuspend(&tb->dev);
227err_free_acl:
228 kfree(acl);
229err_free_str:
230 kfree(str);
231
232 return ret ?: count;
233}
234static DEVICE_ATTR_RW(boot_acl);
235
236static ssize_t deauthorization_show(struct device *dev,
237 struct device_attribute *attr,
238 char *buf)
239{
240 const struct tb *tb = container_of(dev, struct tb, dev);
241 bool deauthorization = false;
242
243 /* Only meaningful if authorization is supported */
244 if (tb->security_level == TB_SECURITY_USER ||
245 tb->security_level == TB_SECURITY_SECURE)
246 deauthorization = !!tb->cm_ops->disapprove_switch;
247
248 return sysfs_emit(buf, "%d\n", deauthorization);
249}
250static DEVICE_ATTR_RO(deauthorization);
251
252static ssize_t iommu_dma_protection_show(struct device *dev,
253 struct device_attribute *attr,
254 char *buf)
255{
256 struct tb *tb = container_of(dev, struct tb, dev);
257
258 return sysfs_emit(buf, "%d\n", tb->nhi->iommu_dma_protection);
259}
260static DEVICE_ATTR_RO(iommu_dma_protection);
261
262static ssize_t security_show(struct device *dev, struct device_attribute *attr,
263 char *buf)
264{
265 struct tb *tb = container_of(dev, struct tb, dev);
266 const char *name = "unknown";
267
268 if (tb->security_level < ARRAY_SIZE(tb_security_names))
269 name = tb_security_names[tb->security_level];
270
271 return sysfs_emit(buf, "%s\n", name);
272}
273static DEVICE_ATTR_RO(security);
274
275static struct attribute *domain_attrs[] = {
276 &dev_attr_boot_acl.attr,
277 &dev_attr_deauthorization.attr,
278 &dev_attr_iommu_dma_protection.attr,
279 &dev_attr_security.attr,
280 NULL,
281};
282
283static umode_t domain_attr_is_visible(struct kobject *kobj,
284 struct attribute *attr, int n)
285{
286 struct device *dev = kobj_to_dev(kobj);
287 struct tb *tb = container_of(dev, struct tb, dev);
288
289 if (attr == &dev_attr_boot_acl.attr) {
290 if (tb->nboot_acl &&
291 tb->cm_ops->get_boot_acl &&
292 tb->cm_ops->set_boot_acl)
293 return attr->mode;
294 return 0;
295 }
296
297 return attr->mode;
298}
299
300static const struct attribute_group domain_attr_group = {
301 .is_visible = domain_attr_is_visible,
302 .attrs = domain_attrs,
303};
304
305static const struct attribute_group *domain_attr_groups[] = {
306 &domain_attr_group,
307 NULL,
308};
309
310struct bus_type tb_bus_type = {
311 .name = "thunderbolt",
312 .match = tb_service_match,
313 .probe = tb_service_probe,
314 .remove = tb_service_remove,
315 .shutdown = tb_service_shutdown,
316};
317
318static void tb_domain_release(struct device *dev)
319{
320 struct tb *tb = container_of(dev, struct tb, dev);
321
322 tb_ctl_free(tb->ctl);
323 destroy_workqueue(tb->wq);
324 ida_simple_remove(&tb_domain_ida, tb->index);
325 mutex_destroy(&tb->lock);
326 kfree(tb);
327}
328
329struct device_type tb_domain_type = {
330 .name = "thunderbolt_domain",
331 .release = tb_domain_release,
332};
333
334static bool tb_domain_event_cb(void *data, enum tb_cfg_pkg_type type,
335 const void *buf, size_t size)
336{
337 struct tb *tb = data;
338
339 if (!tb->cm_ops->handle_event) {
340 tb_warn(tb, "domain does not have event handler\n");
341 return true;
342 }
343
344 switch (type) {
345 case TB_CFG_PKG_XDOMAIN_REQ:
346 case TB_CFG_PKG_XDOMAIN_RESP:
347 if (tb_is_xdomain_enabled())
348 return tb_xdomain_handle_request(tb, type, buf, size);
349 break;
350
351 default:
352 tb->cm_ops->handle_event(tb, type, buf, size);
353 }
354
355 return true;
356}
357
358/**
359 * tb_domain_alloc() - Allocate a domain
360 * @nhi: Pointer to the host controller
361 * @timeout_msec: Control channel timeout for non-raw messages
362 * @privsize: Size of the connection manager private data
363 *
364 * Allocates and initializes a new Thunderbolt domain. Connection
365 * managers are expected to call this and then fill in @cm_ops
366 * accordingly.
367 *
368 * Call tb_domain_put() to release the domain before it has been added
369 * to the system.
370 *
371 * Return: allocated domain structure on %NULL in case of error
372 */
373struct tb *tb_domain_alloc(struct tb_nhi *nhi, int timeout_msec, size_t privsize)
374{
375 struct tb *tb;
376
377 /*
378 * Make sure the structure sizes map with that the hardware
379 * expects because bit-fields are being used.
380 */
381 BUILD_BUG_ON(sizeof(struct tb_regs_switch_header) != 5 * 4);
382 BUILD_BUG_ON(sizeof(struct tb_regs_port_header) != 8 * 4);
383 BUILD_BUG_ON(sizeof(struct tb_regs_hop) != 2 * 4);
384
385 tb = kzalloc(sizeof(*tb) + privsize, GFP_KERNEL);
386 if (!tb)
387 return NULL;
388
389 tb->nhi = nhi;
390 mutex_init(&tb->lock);
391
392 tb->index = ida_simple_get(&tb_domain_ida, 0, 0, GFP_KERNEL);
393 if (tb->index < 0)
394 goto err_free;
395
396 tb->wq = alloc_ordered_workqueue("thunderbolt%d", 0, tb->index);
397 if (!tb->wq)
398 goto err_remove_ida;
399
400 tb->ctl = tb_ctl_alloc(nhi, timeout_msec, tb_domain_event_cb, tb);
401 if (!tb->ctl)
402 goto err_destroy_wq;
403
404 tb->dev.parent = &nhi->pdev->dev;
405 tb->dev.bus = &tb_bus_type;
406 tb->dev.type = &tb_domain_type;
407 tb->dev.groups = domain_attr_groups;
408 dev_set_name(&tb->dev, "domain%d", tb->index);
409 device_initialize(&tb->dev);
410
411 return tb;
412
413err_destroy_wq:
414 destroy_workqueue(tb->wq);
415err_remove_ida:
416 ida_simple_remove(&tb_domain_ida, tb->index);
417err_free:
418 kfree(tb);
419
420 return NULL;
421}
422
423/**
424 * tb_domain_add() - Add domain to the system
425 * @tb: Domain to add
426 *
427 * Starts the domain and adds it to the system. Hotplugging devices will
428 * work after this has been returned successfully. In order to remove
429 * and release the domain after this function has been called, call
430 * tb_domain_remove().
431 *
432 * Return: %0 in case of success and negative errno in case of error
433 */
434int tb_domain_add(struct tb *tb)
435{
436 int ret;
437
438 if (WARN_ON(!tb->cm_ops))
439 return -EINVAL;
440
441 mutex_lock(&tb->lock);
442 /*
443 * tb_schedule_hotplug_handler may be called as soon as the config
444 * channel is started. Thats why we have to hold the lock here.
445 */
446 tb_ctl_start(tb->ctl);
447
448 if (tb->cm_ops->driver_ready) {
449 ret = tb->cm_ops->driver_ready(tb);
450 if (ret)
451 goto err_ctl_stop;
452 }
453
454 tb_dbg(tb, "security level set to %s\n",
455 tb_security_names[tb->security_level]);
456
457 ret = device_add(&tb->dev);
458 if (ret)
459 goto err_ctl_stop;
460
461 /* Start the domain */
462 if (tb->cm_ops->start) {
463 ret = tb->cm_ops->start(tb);
464 if (ret)
465 goto err_domain_del;
466 }
467
468 /* This starts event processing */
469 mutex_unlock(&tb->lock);
470
471 device_init_wakeup(&tb->dev, true);
472
473 pm_runtime_no_callbacks(&tb->dev);
474 pm_runtime_set_active(&tb->dev);
475 pm_runtime_enable(&tb->dev);
476 pm_runtime_set_autosuspend_delay(&tb->dev, TB_AUTOSUSPEND_DELAY);
477 pm_runtime_mark_last_busy(&tb->dev);
478 pm_runtime_use_autosuspend(&tb->dev);
479
480 return 0;
481
482err_domain_del:
483 device_del(&tb->dev);
484err_ctl_stop:
485 tb_ctl_stop(tb->ctl);
486 mutex_unlock(&tb->lock);
487
488 return ret;
489}
490
491/**
492 * tb_domain_remove() - Removes and releases a domain
493 * @tb: Domain to remove
494 *
495 * Stops the domain, removes it from the system and releases all
496 * resources once the last reference has been released.
497 */
498void tb_domain_remove(struct tb *tb)
499{
500 mutex_lock(&tb->lock);
501 if (tb->cm_ops->stop)
502 tb->cm_ops->stop(tb);
503 /* Stop the domain control traffic */
504 tb_ctl_stop(tb->ctl);
505 mutex_unlock(&tb->lock);
506
507 flush_workqueue(tb->wq);
508 device_unregister(&tb->dev);
509}
510
511/**
512 * tb_domain_suspend_noirq() - Suspend a domain
513 * @tb: Domain to suspend
514 *
515 * Suspends all devices in the domain and stops the control channel.
516 */
517int tb_domain_suspend_noirq(struct tb *tb)
518{
519 int ret = 0;
520
521 /*
522 * The control channel interrupt is left enabled during suspend
523 * and taking the lock here prevents any events happening before
524 * we actually have stopped the domain and the control channel.
525 */
526 mutex_lock(&tb->lock);
527 if (tb->cm_ops->suspend_noirq)
528 ret = tb->cm_ops->suspend_noirq(tb);
529 if (!ret)
530 tb_ctl_stop(tb->ctl);
531 mutex_unlock(&tb->lock);
532
533 return ret;
534}
535
536/**
537 * tb_domain_resume_noirq() - Resume a domain
538 * @tb: Domain to resume
539 *
540 * Re-starts the control channel, and resumes all devices connected to
541 * the domain.
542 */
543int tb_domain_resume_noirq(struct tb *tb)
544{
545 int ret = 0;
546
547 mutex_lock(&tb->lock);
548 tb_ctl_start(tb->ctl);
549 if (tb->cm_ops->resume_noirq)
550 ret = tb->cm_ops->resume_noirq(tb);
551 mutex_unlock(&tb->lock);
552
553 return ret;
554}
555
556int tb_domain_suspend(struct tb *tb)
557{
558 return tb->cm_ops->suspend ? tb->cm_ops->suspend(tb) : 0;
559}
560
561int tb_domain_freeze_noirq(struct tb *tb)
562{
563 int ret = 0;
564
565 mutex_lock(&tb->lock);
566 if (tb->cm_ops->freeze_noirq)
567 ret = tb->cm_ops->freeze_noirq(tb);
568 if (!ret)
569 tb_ctl_stop(tb->ctl);
570 mutex_unlock(&tb->lock);
571
572 return ret;
573}
574
575int tb_domain_thaw_noirq(struct tb *tb)
576{
577 int ret = 0;
578
579 mutex_lock(&tb->lock);
580 tb_ctl_start(tb->ctl);
581 if (tb->cm_ops->thaw_noirq)
582 ret = tb->cm_ops->thaw_noirq(tb);
583 mutex_unlock(&tb->lock);
584
585 return ret;
586}
587
588void tb_domain_complete(struct tb *tb)
589{
590 if (tb->cm_ops->complete)
591 tb->cm_ops->complete(tb);
592}
593
594int tb_domain_runtime_suspend(struct tb *tb)
595{
596 if (tb->cm_ops->runtime_suspend) {
597 int ret = tb->cm_ops->runtime_suspend(tb);
598 if (ret)
599 return ret;
600 }
601 tb_ctl_stop(tb->ctl);
602 return 0;
603}
604
605int tb_domain_runtime_resume(struct tb *tb)
606{
607 tb_ctl_start(tb->ctl);
608 if (tb->cm_ops->runtime_resume) {
609 int ret = tb->cm_ops->runtime_resume(tb);
610 if (ret)
611 return ret;
612 }
613 return 0;
614}
615
616/**
617 * tb_domain_disapprove_switch() - Disapprove switch
618 * @tb: Domain the switch belongs to
619 * @sw: Switch to disapprove
620 *
621 * This will disconnect PCIe tunnel from parent to this @sw.
622 *
623 * Return: %0 on success and negative errno in case of failure.
624 */
625int tb_domain_disapprove_switch(struct tb *tb, struct tb_switch *sw)
626{
627 if (!tb->cm_ops->disapprove_switch)
628 return -EPERM;
629
630 return tb->cm_ops->disapprove_switch(tb, sw);
631}
632
633/**
634 * tb_domain_approve_switch() - Approve switch
635 * @tb: Domain the switch belongs to
636 * @sw: Switch to approve
637 *
638 * This will approve switch by connection manager specific means. In
639 * case of success the connection manager will create PCIe tunnel from
640 * parent to @sw.
641 */
642int tb_domain_approve_switch(struct tb *tb, struct tb_switch *sw)
643{
644 struct tb_switch *parent_sw;
645
646 if (!tb->cm_ops->approve_switch)
647 return -EPERM;
648
649 /* The parent switch must be authorized before this one */
650 parent_sw = tb_to_switch(sw->dev.parent);
651 if (!parent_sw || !parent_sw->authorized)
652 return -EINVAL;
653
654 return tb->cm_ops->approve_switch(tb, sw);
655}
656
657/**
658 * tb_domain_approve_switch_key() - Approve switch and add key
659 * @tb: Domain the switch belongs to
660 * @sw: Switch to approve
661 *
662 * For switches that support secure connect, this function first adds
663 * key to the switch NVM using connection manager specific means. If
664 * adding the key is successful, the switch is approved and connected.
665 *
666 * Return: %0 on success and negative errno in case of failure.
667 */
668int tb_domain_approve_switch_key(struct tb *tb, struct tb_switch *sw)
669{
670 struct tb_switch *parent_sw;
671 int ret;
672
673 if (!tb->cm_ops->approve_switch || !tb->cm_ops->add_switch_key)
674 return -EPERM;
675
676 /* The parent switch must be authorized before this one */
677 parent_sw = tb_to_switch(sw->dev.parent);
678 if (!parent_sw || !parent_sw->authorized)
679 return -EINVAL;
680
681 ret = tb->cm_ops->add_switch_key(tb, sw);
682 if (ret)
683 return ret;
684
685 return tb->cm_ops->approve_switch(tb, sw);
686}
687
688/**
689 * tb_domain_challenge_switch_key() - Challenge and approve switch
690 * @tb: Domain the switch belongs to
691 * @sw: Switch to approve
692 *
693 * For switches that support secure connect, this function generates
694 * random challenge and sends it to the switch. The switch responds to
695 * this and if the response matches our random challenge, the switch is
696 * approved and connected.
697 *
698 * Return: %0 on success and negative errno in case of failure.
699 */
700int tb_domain_challenge_switch_key(struct tb *tb, struct tb_switch *sw)
701{
702 u8 challenge[TB_SWITCH_KEY_SIZE];
703 u8 response[TB_SWITCH_KEY_SIZE];
704 u8 hmac[TB_SWITCH_KEY_SIZE];
705 struct tb_switch *parent_sw;
706 struct crypto_shash *tfm;
707 struct shash_desc *shash;
708 int ret;
709
710 if (!tb->cm_ops->approve_switch || !tb->cm_ops->challenge_switch_key)
711 return -EPERM;
712
713 /* The parent switch must be authorized before this one */
714 parent_sw = tb_to_switch(sw->dev.parent);
715 if (!parent_sw || !parent_sw->authorized)
716 return -EINVAL;
717
718 get_random_bytes(challenge, sizeof(challenge));
719 ret = tb->cm_ops->challenge_switch_key(tb, sw, challenge, response);
720 if (ret)
721 return ret;
722
723 tfm = crypto_alloc_shash("hmac(sha256)", 0, 0);
724 if (IS_ERR(tfm))
725 return PTR_ERR(tfm);
726
727 ret = crypto_shash_setkey(tfm, sw->key, TB_SWITCH_KEY_SIZE);
728 if (ret)
729 goto err_free_tfm;
730
731 shash = kzalloc(sizeof(*shash) + crypto_shash_descsize(tfm),
732 GFP_KERNEL);
733 if (!shash) {
734 ret = -ENOMEM;
735 goto err_free_tfm;
736 }
737
738 shash->tfm = tfm;
739
740 memset(hmac, 0, sizeof(hmac));
741 ret = crypto_shash_digest(shash, challenge, sizeof(hmac), hmac);
742 if (ret)
743 goto err_free_shash;
744
745 /* The returned HMAC must match the one we calculated */
746 if (memcmp(response, hmac, sizeof(hmac))) {
747 ret = -EKEYREJECTED;
748 goto err_free_shash;
749 }
750
751 crypto_free_shash(tfm);
752 kfree(shash);
753
754 return tb->cm_ops->approve_switch(tb, sw);
755
756err_free_shash:
757 kfree(shash);
758err_free_tfm:
759 crypto_free_shash(tfm);
760
761 return ret;
762}
763
764/**
765 * tb_domain_disconnect_pcie_paths() - Disconnect all PCIe paths
766 * @tb: Domain whose PCIe paths to disconnect
767 *
768 * This needs to be called in preparation for NVM upgrade of the host
769 * controller. Makes sure all PCIe paths are disconnected.
770 *
771 * Return %0 on success and negative errno in case of error.
772 */
773int tb_domain_disconnect_pcie_paths(struct tb *tb)
774{
775 if (!tb->cm_ops->disconnect_pcie_paths)
776 return -EPERM;
777
778 return tb->cm_ops->disconnect_pcie_paths(tb);
779}
780
781/**
782 * tb_domain_approve_xdomain_paths() - Enable DMA paths for XDomain
783 * @tb: Domain enabling the DMA paths
784 * @xd: XDomain DMA paths are created to
785 * @transmit_path: HopID we are using to send out packets
786 * @transmit_ring: DMA ring used to send out packets
787 * @receive_path: HopID the other end is using to send packets to us
788 * @receive_ring: DMA ring used to receive packets from @receive_path
789 *
790 * Calls connection manager specific method to enable DMA paths to the
791 * XDomain in question.
792 *
793 * Return: 0% in case of success and negative errno otherwise. In
794 * particular returns %-ENOTSUPP if the connection manager
795 * implementation does not support XDomains.
796 */
797int tb_domain_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd,
798 int transmit_path, int transmit_ring,
799 int receive_path, int receive_ring)
800{
801 if (!tb->cm_ops->approve_xdomain_paths)
802 return -ENOTSUPP;
803
804 return tb->cm_ops->approve_xdomain_paths(tb, xd, transmit_path,
805 transmit_ring, receive_path, receive_ring);
806}
807
808/**
809 * tb_domain_disconnect_xdomain_paths() - Disable DMA paths for XDomain
810 * @tb: Domain disabling the DMA paths
811 * @xd: XDomain whose DMA paths are disconnected
812 * @transmit_path: HopID we are using to send out packets
813 * @transmit_ring: DMA ring used to send out packets
814 * @receive_path: HopID the other end is using to send packets to us
815 * @receive_ring: DMA ring used to receive packets from @receive_path
816 *
817 * Calls connection manager specific method to disconnect DMA paths to
818 * the XDomain in question.
819 *
820 * Return: 0% in case of success and negative errno otherwise. In
821 * particular returns %-ENOTSUPP if the connection manager
822 * implementation does not support XDomains.
823 */
824int tb_domain_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd,
825 int transmit_path, int transmit_ring,
826 int receive_path, int receive_ring)
827{
828 if (!tb->cm_ops->disconnect_xdomain_paths)
829 return -ENOTSUPP;
830
831 return tb->cm_ops->disconnect_xdomain_paths(tb, xd, transmit_path,
832 transmit_ring, receive_path, receive_ring);
833}
834
835static int disconnect_xdomain(struct device *dev, void *data)
836{
837 struct tb_xdomain *xd;
838 struct tb *tb = data;
839 int ret = 0;
840
841 xd = tb_to_xdomain(dev);
842 if (xd && xd->tb == tb)
843 ret = tb_xdomain_disable_all_paths(xd);
844
845 return ret;
846}
847
848/**
849 * tb_domain_disconnect_all_paths() - Disconnect all paths for the domain
850 * @tb: Domain whose paths are disconnected
851 *
852 * This function can be used to disconnect all paths (PCIe, XDomain) for
853 * example in preparation for host NVM firmware upgrade. After this is
854 * called the paths cannot be established without resetting the switch.
855 *
856 * Return: %0 in case of success and negative errno otherwise.
857 */
858int tb_domain_disconnect_all_paths(struct tb *tb)
859{
860 int ret;
861
862 ret = tb_domain_disconnect_pcie_paths(tb);
863 if (ret)
864 return ret;
865
866 return bus_for_each_dev(&tb_bus_type, NULL, tb, disconnect_xdomain);
867}
868
869int tb_domain_init(void)
870{
871 int ret;
872
873 tb_debugfs_init();
874 tb_acpi_init();
875
876 ret = tb_xdomain_init();
877 if (ret)
878 goto err_acpi;
879 ret = bus_register(&tb_bus_type);
880 if (ret)
881 goto err_xdomain;
882
883 return 0;
884
885err_xdomain:
886 tb_xdomain_exit();
887err_acpi:
888 tb_acpi_exit();
889 tb_debugfs_exit();
890
891 return ret;
892}
893
894void tb_domain_exit(void)
895{
896 bus_unregister(&tb_bus_type);
897 ida_destroy(&tb_domain_ida);
898 tb_nvm_exit();
899 tb_xdomain_exit();
900 tb_acpi_exit();
901 tb_debugfs_exit();
902}