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fd3b339c | 1 | // SPDX-License-Identifier: GPL-2.0 |
9d3cce0b MW |
2 | /* |
3 | * Thunderbolt bus support | |
4 | * | |
5 | * Copyright (C) 2017, Intel Corporation | |
fd3b339c | 6 | * Author: Mika Westerberg <mika.westerberg@linux.intel.com> |
9d3cce0b MW |
7 | */ |
8 | ||
9 | #include <linux/device.h> | |
dcc3c9e3 | 10 | #include <linux/dmar.h> |
9d3cce0b | 11 | #include <linux/idr.h> |
dcc3c9e3 | 12 | #include <linux/iommu.h> |
9d3cce0b | 13 | #include <linux/module.h> |
2d8ff0b5 | 14 | #include <linux/pm_runtime.h> |
9d3cce0b | 15 | #include <linux/slab.h> |
f67cf491 MW |
16 | #include <linux/random.h> |
17 | #include <crypto/hash.h> | |
9d3cce0b MW |
18 | |
19 | #include "tb.h" | |
20 | ||
21 | static DEFINE_IDA(tb_domain_ida); | |
22 | ||
d1ff7024 MW |
23 | static bool match_service_id(const struct tb_service_id *id, |
24 | const struct tb_service *svc) | |
25 | { | |
26 | if (id->match_flags & TBSVC_MATCH_PROTOCOL_KEY) { | |
27 | if (strcmp(id->protocol_key, svc->key)) | |
28 | return false; | |
29 | } | |
30 | ||
31 | if (id->match_flags & TBSVC_MATCH_PROTOCOL_ID) { | |
32 | if (id->protocol_id != svc->prtcid) | |
33 | return false; | |
34 | } | |
35 | ||
36 | if (id->match_flags & TBSVC_MATCH_PROTOCOL_VERSION) { | |
37 | if (id->protocol_version != svc->prtcvers) | |
38 | return false; | |
39 | } | |
40 | ||
41 | if (id->match_flags & TBSVC_MATCH_PROTOCOL_VERSION) { | |
42 | if (id->protocol_revision != svc->prtcrevs) | |
43 | return false; | |
44 | } | |
45 | ||
46 | return true; | |
47 | } | |
48 | ||
49 | static const struct tb_service_id *__tb_service_match(struct device *dev, | |
50 | struct device_driver *drv) | |
51 | { | |
52 | struct tb_service_driver *driver; | |
53 | const struct tb_service_id *ids; | |
54 | struct tb_service *svc; | |
55 | ||
56 | svc = tb_to_service(dev); | |
57 | if (!svc) | |
58 | return NULL; | |
59 | ||
60 | driver = container_of(drv, struct tb_service_driver, driver); | |
61 | if (!driver->id_table) | |
62 | return NULL; | |
63 | ||
64 | for (ids = driver->id_table; ids->match_flags != 0; ids++) { | |
65 | if (match_service_id(ids, svc)) | |
66 | return ids; | |
67 | } | |
68 | ||
69 | return NULL; | |
70 | } | |
71 | ||
72 | static int tb_service_match(struct device *dev, struct device_driver *drv) | |
73 | { | |
74 | return !!__tb_service_match(dev, drv); | |
75 | } | |
76 | ||
77 | static int tb_service_probe(struct device *dev) | |
78 | { | |
79 | struct tb_service *svc = tb_to_service(dev); | |
80 | struct tb_service_driver *driver; | |
81 | const struct tb_service_id *id; | |
82 | ||
83 | driver = container_of(dev->driver, struct tb_service_driver, driver); | |
84 | id = __tb_service_match(dev, &driver->driver); | |
85 | ||
86 | return driver->probe(svc, id); | |
87 | } | |
88 | ||
89 | static int tb_service_remove(struct device *dev) | |
90 | { | |
91 | struct tb_service *svc = tb_to_service(dev); | |
92 | struct tb_service_driver *driver; | |
93 | ||
94 | driver = container_of(dev->driver, struct tb_service_driver, driver); | |
95 | if (driver->remove) | |
96 | driver->remove(svc); | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | static void tb_service_shutdown(struct device *dev) | |
102 | { | |
103 | struct tb_service_driver *driver; | |
104 | struct tb_service *svc; | |
105 | ||
106 | svc = tb_to_service(dev); | |
107 | if (!svc || !dev->driver) | |
108 | return; | |
109 | ||
110 | driver = container_of(dev->driver, struct tb_service_driver, driver); | |
111 | if (driver->shutdown) | |
112 | driver->shutdown(svc); | |
113 | } | |
114 | ||
f67cf491 MW |
115 | static const char * const tb_security_names[] = { |
116 | [TB_SECURITY_NONE] = "none", | |
117 | [TB_SECURITY_USER] = "user", | |
118 | [TB_SECURITY_SECURE] = "secure", | |
119 | [TB_SECURITY_DPONLY] = "dponly", | |
6fc14e1a | 120 | [TB_SECURITY_USBONLY] = "usbonly", |
f67cf491 MW |
121 | }; |
122 | ||
9aaa3b8b MW |
123 | static ssize_t boot_acl_show(struct device *dev, struct device_attribute *attr, |
124 | char *buf) | |
125 | { | |
126 | struct tb *tb = container_of(dev, struct tb, dev); | |
127 | uuid_t *uuids; | |
128 | ssize_t ret; | |
129 | int i; | |
130 | ||
131 | uuids = kcalloc(tb->nboot_acl, sizeof(uuid_t), GFP_KERNEL); | |
132 | if (!uuids) | |
133 | return -ENOMEM; | |
134 | ||
2d8ff0b5 MW |
135 | pm_runtime_get_sync(&tb->dev); |
136 | ||
9aaa3b8b MW |
137 | if (mutex_lock_interruptible(&tb->lock)) { |
138 | ret = -ERESTARTSYS; | |
139 | goto out; | |
140 | } | |
141 | ret = tb->cm_ops->get_boot_acl(tb, uuids, tb->nboot_acl); | |
142 | if (ret) { | |
143 | mutex_unlock(&tb->lock); | |
144 | goto out; | |
145 | } | |
146 | mutex_unlock(&tb->lock); | |
147 | ||
148 | for (ret = 0, i = 0; i < tb->nboot_acl; i++) { | |
149 | if (!uuid_is_null(&uuids[i])) | |
150 | ret += snprintf(buf + ret, PAGE_SIZE - ret, "%pUb", | |
151 | &uuids[i]); | |
152 | ||
153 | ret += snprintf(buf + ret, PAGE_SIZE - ret, "%s", | |
154 | i < tb->nboot_acl - 1 ? "," : "\n"); | |
155 | } | |
156 | ||
157 | out: | |
2d8ff0b5 MW |
158 | pm_runtime_mark_last_busy(&tb->dev); |
159 | pm_runtime_put_autosuspend(&tb->dev); | |
9aaa3b8b | 160 | kfree(uuids); |
2d8ff0b5 | 161 | |
9aaa3b8b MW |
162 | return ret; |
163 | } | |
164 | ||
165 | static ssize_t boot_acl_store(struct device *dev, struct device_attribute *attr, | |
166 | const char *buf, size_t count) | |
167 | { | |
168 | struct tb *tb = container_of(dev, struct tb, dev); | |
169 | char *str, *s, *uuid_str; | |
170 | ssize_t ret = 0; | |
171 | uuid_t *acl; | |
172 | int i = 0; | |
173 | ||
174 | /* | |
175 | * Make sure the value is not bigger than tb->nboot_acl * UUID | |
176 | * length + commas and optional "\n". Also the smallest allowable | |
177 | * string is tb->nboot_acl * ",". | |
178 | */ | |
179 | if (count > (UUID_STRING_LEN + 1) * tb->nboot_acl + 1) | |
180 | return -EINVAL; | |
181 | if (count < tb->nboot_acl - 1) | |
182 | return -EINVAL; | |
183 | ||
184 | str = kstrdup(buf, GFP_KERNEL); | |
185 | if (!str) | |
186 | return -ENOMEM; | |
187 | ||
188 | acl = kcalloc(tb->nboot_acl, sizeof(uuid_t), GFP_KERNEL); | |
189 | if (!acl) { | |
190 | ret = -ENOMEM; | |
191 | goto err_free_str; | |
192 | } | |
193 | ||
194 | uuid_str = strim(str); | |
195 | while ((s = strsep(&uuid_str, ",")) != NULL && i < tb->nboot_acl) { | |
196 | size_t len = strlen(s); | |
197 | ||
198 | if (len) { | |
199 | if (len != UUID_STRING_LEN) { | |
200 | ret = -EINVAL; | |
201 | goto err_free_acl; | |
202 | } | |
203 | ret = uuid_parse(s, &acl[i]); | |
204 | if (ret) | |
205 | goto err_free_acl; | |
206 | } | |
207 | ||
208 | i++; | |
209 | } | |
210 | ||
211 | if (s || i < tb->nboot_acl) { | |
212 | ret = -EINVAL; | |
213 | goto err_free_acl; | |
214 | } | |
215 | ||
2d8ff0b5 MW |
216 | pm_runtime_get_sync(&tb->dev); |
217 | ||
9aaa3b8b MW |
218 | if (mutex_lock_interruptible(&tb->lock)) { |
219 | ret = -ERESTARTSYS; | |
2d8ff0b5 | 220 | goto err_rpm_put; |
9aaa3b8b MW |
221 | } |
222 | ret = tb->cm_ops->set_boot_acl(tb, acl, tb->nboot_acl); | |
007a7490 MW |
223 | if (!ret) { |
224 | /* Notify userspace about the change */ | |
225 | kobject_uevent(&tb->dev.kobj, KOBJ_CHANGE); | |
226 | } | |
9aaa3b8b MW |
227 | mutex_unlock(&tb->lock); |
228 | ||
2d8ff0b5 MW |
229 | err_rpm_put: |
230 | pm_runtime_mark_last_busy(&tb->dev); | |
231 | pm_runtime_put_autosuspend(&tb->dev); | |
9aaa3b8b MW |
232 | err_free_acl: |
233 | kfree(acl); | |
234 | err_free_str: | |
235 | kfree(str); | |
236 | ||
237 | return ret ?: count; | |
238 | } | |
239 | static DEVICE_ATTR_RW(boot_acl); | |
240 | ||
dcc3c9e3 MW |
241 | static ssize_t iommu_dma_protection_show(struct device *dev, |
242 | struct device_attribute *attr, | |
243 | char *buf) | |
244 | { | |
245 | /* | |
246 | * Kernel DMA protection is a feature where Thunderbolt security is | |
247 | * handled natively using IOMMU. It is enabled when IOMMU is | |
248 | * enabled and ACPI DMAR table has DMAR_PLATFORM_OPT_IN set. | |
249 | */ | |
250 | return sprintf(buf, "%d\n", | |
251 | iommu_present(&pci_bus_type) && dmar_platform_optin()); | |
252 | } | |
253 | static DEVICE_ATTR_RO(iommu_dma_protection); | |
254 | ||
f67cf491 MW |
255 | static ssize_t security_show(struct device *dev, struct device_attribute *attr, |
256 | char *buf) | |
257 | { | |
258 | struct tb *tb = container_of(dev, struct tb, dev); | |
6fc14e1a | 259 | const char *name = "unknown"; |
f67cf491 | 260 | |
6fc14e1a MW |
261 | if (tb->security_level < ARRAY_SIZE(tb_security_names)) |
262 | name = tb_security_names[tb->security_level]; | |
263 | ||
264 | return sprintf(buf, "%s\n", name); | |
f67cf491 MW |
265 | } |
266 | static DEVICE_ATTR_RO(security); | |
267 | ||
268 | static struct attribute *domain_attrs[] = { | |
9aaa3b8b | 269 | &dev_attr_boot_acl.attr, |
dcc3c9e3 | 270 | &dev_attr_iommu_dma_protection.attr, |
f67cf491 MW |
271 | &dev_attr_security.attr, |
272 | NULL, | |
273 | }; | |
274 | ||
9aaa3b8b MW |
275 | static umode_t domain_attr_is_visible(struct kobject *kobj, |
276 | struct attribute *attr, int n) | |
277 | { | |
278 | struct device *dev = container_of(kobj, struct device, kobj); | |
279 | struct tb *tb = container_of(dev, struct tb, dev); | |
280 | ||
281 | if (attr == &dev_attr_boot_acl.attr) { | |
282 | if (tb->nboot_acl && | |
283 | tb->cm_ops->get_boot_acl && | |
284 | tb->cm_ops->set_boot_acl) | |
285 | return attr->mode; | |
286 | return 0; | |
287 | } | |
288 | ||
289 | return attr->mode; | |
290 | } | |
291 | ||
f67cf491 | 292 | static struct attribute_group domain_attr_group = { |
9aaa3b8b | 293 | .is_visible = domain_attr_is_visible, |
f67cf491 MW |
294 | .attrs = domain_attrs, |
295 | }; | |
296 | ||
297 | static const struct attribute_group *domain_attr_groups[] = { | |
298 | &domain_attr_group, | |
299 | NULL, | |
300 | }; | |
301 | ||
9d3cce0b MW |
302 | struct bus_type tb_bus_type = { |
303 | .name = "thunderbolt", | |
d1ff7024 MW |
304 | .match = tb_service_match, |
305 | .probe = tb_service_probe, | |
306 | .remove = tb_service_remove, | |
307 | .shutdown = tb_service_shutdown, | |
9d3cce0b MW |
308 | }; |
309 | ||
310 | static void tb_domain_release(struct device *dev) | |
311 | { | |
312 | struct tb *tb = container_of(dev, struct tb, dev); | |
313 | ||
314 | tb_ctl_free(tb->ctl); | |
315 | destroy_workqueue(tb->wq); | |
316 | ida_simple_remove(&tb_domain_ida, tb->index); | |
317 | mutex_destroy(&tb->lock); | |
318 | kfree(tb); | |
319 | } | |
320 | ||
321 | struct device_type tb_domain_type = { | |
322 | .name = "thunderbolt_domain", | |
323 | .release = tb_domain_release, | |
324 | }; | |
325 | ||
326 | /** | |
327 | * tb_domain_alloc() - Allocate a domain | |
328 | * @nhi: Pointer to the host controller | |
329 | * @privsize: Size of the connection manager private data | |
330 | * | |
331 | * Allocates and initializes a new Thunderbolt domain. Connection | |
332 | * managers are expected to call this and then fill in @cm_ops | |
333 | * accordingly. | |
334 | * | |
335 | * Call tb_domain_put() to release the domain before it has been added | |
336 | * to the system. | |
337 | * | |
338 | * Return: allocated domain structure on %NULL in case of error | |
339 | */ | |
340 | struct tb *tb_domain_alloc(struct tb_nhi *nhi, size_t privsize) | |
341 | { | |
342 | struct tb *tb; | |
343 | ||
344 | /* | |
345 | * Make sure the structure sizes map with that the hardware | |
346 | * expects because bit-fields are being used. | |
347 | */ | |
348 | BUILD_BUG_ON(sizeof(struct tb_regs_switch_header) != 5 * 4); | |
349 | BUILD_BUG_ON(sizeof(struct tb_regs_port_header) != 8 * 4); | |
350 | BUILD_BUG_ON(sizeof(struct tb_regs_hop) != 2 * 4); | |
351 | ||
352 | tb = kzalloc(sizeof(*tb) + privsize, GFP_KERNEL); | |
353 | if (!tb) | |
354 | return NULL; | |
355 | ||
356 | tb->nhi = nhi; | |
357 | mutex_init(&tb->lock); | |
358 | ||
359 | tb->index = ida_simple_get(&tb_domain_ida, 0, 0, GFP_KERNEL); | |
360 | if (tb->index < 0) | |
361 | goto err_free; | |
362 | ||
363 | tb->wq = alloc_ordered_workqueue("thunderbolt%d", 0, tb->index); | |
364 | if (!tb->wq) | |
365 | goto err_remove_ida; | |
366 | ||
367 | tb->dev.parent = &nhi->pdev->dev; | |
368 | tb->dev.bus = &tb_bus_type; | |
369 | tb->dev.type = &tb_domain_type; | |
f67cf491 | 370 | tb->dev.groups = domain_attr_groups; |
9d3cce0b MW |
371 | dev_set_name(&tb->dev, "domain%d", tb->index); |
372 | device_initialize(&tb->dev); | |
373 | ||
374 | return tb; | |
375 | ||
376 | err_remove_ida: | |
377 | ida_simple_remove(&tb_domain_ida, tb->index); | |
378 | err_free: | |
379 | kfree(tb); | |
380 | ||
381 | return NULL; | |
382 | } | |
383 | ||
d1ff7024 | 384 | static bool tb_domain_event_cb(void *data, enum tb_cfg_pkg_type type, |
81a54b5e MW |
385 | const void *buf, size_t size) |
386 | { | |
387 | struct tb *tb = data; | |
388 | ||
389 | if (!tb->cm_ops->handle_event) { | |
390 | tb_warn(tb, "domain does not have event handler\n"); | |
d1ff7024 | 391 | return true; |
81a54b5e MW |
392 | } |
393 | ||
d1ff7024 MW |
394 | switch (type) { |
395 | case TB_CFG_PKG_XDOMAIN_REQ: | |
396 | case TB_CFG_PKG_XDOMAIN_RESP: | |
397 | return tb_xdomain_handle_request(tb, type, buf, size); | |
398 | ||
399 | default: | |
400 | tb->cm_ops->handle_event(tb, type, buf, size); | |
401 | } | |
402 | ||
403 | return true; | |
81a54b5e MW |
404 | } |
405 | ||
9d3cce0b MW |
406 | /** |
407 | * tb_domain_add() - Add domain to the system | |
408 | * @tb: Domain to add | |
409 | * | |
410 | * Starts the domain and adds it to the system. Hotplugging devices will | |
411 | * work after this has been returned successfully. In order to remove | |
412 | * and release the domain after this function has been called, call | |
413 | * tb_domain_remove(). | |
414 | * | |
415 | * Return: %0 in case of success and negative errno in case of error | |
416 | */ | |
417 | int tb_domain_add(struct tb *tb) | |
418 | { | |
419 | int ret; | |
420 | ||
421 | if (WARN_ON(!tb->cm_ops)) | |
422 | return -EINVAL; | |
423 | ||
424 | mutex_lock(&tb->lock); | |
425 | ||
81a54b5e | 426 | tb->ctl = tb_ctl_alloc(tb->nhi, tb_domain_event_cb, tb); |
9d3cce0b MW |
427 | if (!tb->ctl) { |
428 | ret = -ENOMEM; | |
429 | goto err_unlock; | |
430 | } | |
431 | ||
432 | /* | |
433 | * tb_schedule_hotplug_handler may be called as soon as the config | |
434 | * channel is started. Thats why we have to hold the lock here. | |
435 | */ | |
436 | tb_ctl_start(tb->ctl); | |
437 | ||
f67cf491 MW |
438 | if (tb->cm_ops->driver_ready) { |
439 | ret = tb->cm_ops->driver_ready(tb); | |
440 | if (ret) | |
441 | goto err_ctl_stop; | |
442 | } | |
443 | ||
9d3cce0b MW |
444 | ret = device_add(&tb->dev); |
445 | if (ret) | |
446 | goto err_ctl_stop; | |
447 | ||
448 | /* Start the domain */ | |
449 | if (tb->cm_ops->start) { | |
450 | ret = tb->cm_ops->start(tb); | |
451 | if (ret) | |
452 | goto err_domain_del; | |
453 | } | |
454 | ||
455 | /* This starts event processing */ | |
456 | mutex_unlock(&tb->lock); | |
457 | ||
2d8ff0b5 MW |
458 | pm_runtime_no_callbacks(&tb->dev); |
459 | pm_runtime_set_active(&tb->dev); | |
460 | pm_runtime_enable(&tb->dev); | |
461 | pm_runtime_set_autosuspend_delay(&tb->dev, TB_AUTOSUSPEND_DELAY); | |
462 | pm_runtime_mark_last_busy(&tb->dev); | |
463 | pm_runtime_use_autosuspend(&tb->dev); | |
464 | ||
9d3cce0b MW |
465 | return 0; |
466 | ||
467 | err_domain_del: | |
468 | device_del(&tb->dev); | |
469 | err_ctl_stop: | |
470 | tb_ctl_stop(tb->ctl); | |
471 | err_unlock: | |
472 | mutex_unlock(&tb->lock); | |
473 | ||
474 | return ret; | |
475 | } | |
476 | ||
477 | /** | |
478 | * tb_domain_remove() - Removes and releases a domain | |
479 | * @tb: Domain to remove | |
480 | * | |
481 | * Stops the domain, removes it from the system and releases all | |
482 | * resources once the last reference has been released. | |
483 | */ | |
484 | void tb_domain_remove(struct tb *tb) | |
485 | { | |
486 | mutex_lock(&tb->lock); | |
487 | if (tb->cm_ops->stop) | |
488 | tb->cm_ops->stop(tb); | |
489 | /* Stop the domain control traffic */ | |
490 | tb_ctl_stop(tb->ctl); | |
491 | mutex_unlock(&tb->lock); | |
492 | ||
493 | flush_workqueue(tb->wq); | |
494 | device_unregister(&tb->dev); | |
495 | } | |
496 | ||
497 | /** | |
498 | * tb_domain_suspend_noirq() - Suspend a domain | |
499 | * @tb: Domain to suspend | |
500 | * | |
501 | * Suspends all devices in the domain and stops the control channel. | |
502 | */ | |
503 | int tb_domain_suspend_noirq(struct tb *tb) | |
504 | { | |
505 | int ret = 0; | |
506 | ||
507 | /* | |
508 | * The control channel interrupt is left enabled during suspend | |
509 | * and taking the lock here prevents any events happening before | |
510 | * we actually have stopped the domain and the control channel. | |
511 | */ | |
512 | mutex_lock(&tb->lock); | |
513 | if (tb->cm_ops->suspend_noirq) | |
514 | ret = tb->cm_ops->suspend_noirq(tb); | |
515 | if (!ret) | |
516 | tb_ctl_stop(tb->ctl); | |
517 | mutex_unlock(&tb->lock); | |
518 | ||
519 | return ret; | |
520 | } | |
521 | ||
522 | /** | |
523 | * tb_domain_resume_noirq() - Resume a domain | |
524 | * @tb: Domain to resume | |
525 | * | |
526 | * Re-starts the control channel, and resumes all devices connected to | |
527 | * the domain. | |
528 | */ | |
529 | int tb_domain_resume_noirq(struct tb *tb) | |
530 | { | |
531 | int ret = 0; | |
532 | ||
533 | mutex_lock(&tb->lock); | |
534 | tb_ctl_start(tb->ctl); | |
535 | if (tb->cm_ops->resume_noirq) | |
536 | ret = tb->cm_ops->resume_noirq(tb); | |
537 | mutex_unlock(&tb->lock); | |
538 | ||
539 | return ret; | |
540 | } | |
541 | ||
f67cf491 MW |
542 | int tb_domain_suspend(struct tb *tb) |
543 | { | |
84db6858 | 544 | return tb->cm_ops->suspend ? tb->cm_ops->suspend(tb) : 0; |
f67cf491 MW |
545 | } |
546 | ||
547 | void tb_domain_complete(struct tb *tb) | |
548 | { | |
f67cf491 MW |
549 | if (tb->cm_ops->complete) |
550 | tb->cm_ops->complete(tb); | |
f67cf491 MW |
551 | } |
552 | ||
2d8ff0b5 MW |
553 | int tb_domain_runtime_suspend(struct tb *tb) |
554 | { | |
555 | if (tb->cm_ops->runtime_suspend) { | |
556 | int ret = tb->cm_ops->runtime_suspend(tb); | |
557 | if (ret) | |
558 | return ret; | |
559 | } | |
560 | tb_ctl_stop(tb->ctl); | |
561 | return 0; | |
562 | } | |
563 | ||
564 | int tb_domain_runtime_resume(struct tb *tb) | |
565 | { | |
566 | tb_ctl_start(tb->ctl); | |
567 | if (tb->cm_ops->runtime_resume) { | |
568 | int ret = tb->cm_ops->runtime_resume(tb); | |
569 | if (ret) | |
570 | return ret; | |
571 | } | |
572 | return 0; | |
573 | } | |
574 | ||
f67cf491 MW |
575 | /** |
576 | * tb_domain_approve_switch() - Approve switch | |
577 | * @tb: Domain the switch belongs to | |
578 | * @sw: Switch to approve | |
579 | * | |
580 | * This will approve switch by connection manager specific means. In | |
581 | * case of success the connection manager will create tunnels for all | |
582 | * supported protocols. | |
583 | */ | |
584 | int tb_domain_approve_switch(struct tb *tb, struct tb_switch *sw) | |
585 | { | |
586 | struct tb_switch *parent_sw; | |
587 | ||
588 | if (!tb->cm_ops->approve_switch) | |
589 | return -EPERM; | |
590 | ||
591 | /* The parent switch must be authorized before this one */ | |
592 | parent_sw = tb_to_switch(sw->dev.parent); | |
593 | if (!parent_sw || !parent_sw->authorized) | |
594 | return -EINVAL; | |
595 | ||
596 | return tb->cm_ops->approve_switch(tb, sw); | |
597 | } | |
598 | ||
599 | /** | |
600 | * tb_domain_approve_switch_key() - Approve switch and add key | |
601 | * @tb: Domain the switch belongs to | |
602 | * @sw: Switch to approve | |
603 | * | |
604 | * For switches that support secure connect, this function first adds | |
605 | * key to the switch NVM using connection manager specific means. If | |
606 | * adding the key is successful, the switch is approved and connected. | |
607 | * | |
608 | * Return: %0 on success and negative errno in case of failure. | |
609 | */ | |
610 | int tb_domain_approve_switch_key(struct tb *tb, struct tb_switch *sw) | |
611 | { | |
612 | struct tb_switch *parent_sw; | |
613 | int ret; | |
614 | ||
615 | if (!tb->cm_ops->approve_switch || !tb->cm_ops->add_switch_key) | |
616 | return -EPERM; | |
617 | ||
618 | /* The parent switch must be authorized before this one */ | |
619 | parent_sw = tb_to_switch(sw->dev.parent); | |
620 | if (!parent_sw || !parent_sw->authorized) | |
621 | return -EINVAL; | |
622 | ||
623 | ret = tb->cm_ops->add_switch_key(tb, sw); | |
624 | if (ret) | |
625 | return ret; | |
626 | ||
627 | return tb->cm_ops->approve_switch(tb, sw); | |
628 | } | |
629 | ||
630 | /** | |
631 | * tb_domain_challenge_switch_key() - Challenge and approve switch | |
632 | * @tb: Domain the switch belongs to | |
633 | * @sw: Switch to approve | |
634 | * | |
635 | * For switches that support secure connect, this function generates | |
636 | * random challenge and sends it to the switch. The switch responds to | |
637 | * this and if the response matches our random challenge, the switch is | |
638 | * approved and connected. | |
639 | * | |
640 | * Return: %0 on success and negative errno in case of failure. | |
641 | */ | |
642 | int tb_domain_challenge_switch_key(struct tb *tb, struct tb_switch *sw) | |
643 | { | |
644 | u8 challenge[TB_SWITCH_KEY_SIZE]; | |
645 | u8 response[TB_SWITCH_KEY_SIZE]; | |
646 | u8 hmac[TB_SWITCH_KEY_SIZE]; | |
647 | struct tb_switch *parent_sw; | |
648 | struct crypto_shash *tfm; | |
649 | struct shash_desc *shash; | |
650 | int ret; | |
651 | ||
652 | if (!tb->cm_ops->approve_switch || !tb->cm_ops->challenge_switch_key) | |
653 | return -EPERM; | |
654 | ||
655 | /* The parent switch must be authorized before this one */ | |
656 | parent_sw = tb_to_switch(sw->dev.parent); | |
657 | if (!parent_sw || !parent_sw->authorized) | |
658 | return -EINVAL; | |
659 | ||
660 | get_random_bytes(challenge, sizeof(challenge)); | |
661 | ret = tb->cm_ops->challenge_switch_key(tb, sw, challenge, response); | |
662 | if (ret) | |
663 | return ret; | |
664 | ||
665 | tfm = crypto_alloc_shash("hmac(sha256)", 0, 0); | |
666 | if (IS_ERR(tfm)) | |
667 | return PTR_ERR(tfm); | |
668 | ||
669 | ret = crypto_shash_setkey(tfm, sw->key, TB_SWITCH_KEY_SIZE); | |
670 | if (ret) | |
671 | goto err_free_tfm; | |
672 | ||
673 | shash = kzalloc(sizeof(*shash) + crypto_shash_descsize(tfm), | |
674 | GFP_KERNEL); | |
675 | if (!shash) { | |
676 | ret = -ENOMEM; | |
677 | goto err_free_tfm; | |
678 | } | |
679 | ||
680 | shash->tfm = tfm; | |
f67cf491 MW |
681 | |
682 | memset(hmac, 0, sizeof(hmac)); | |
683 | ret = crypto_shash_digest(shash, challenge, sizeof(hmac), hmac); | |
684 | if (ret) | |
685 | goto err_free_shash; | |
686 | ||
687 | /* The returned HMAC must match the one we calculated */ | |
688 | if (memcmp(response, hmac, sizeof(hmac))) { | |
689 | ret = -EKEYREJECTED; | |
690 | goto err_free_shash; | |
691 | } | |
692 | ||
693 | crypto_free_shash(tfm); | |
694 | kfree(shash); | |
695 | ||
696 | return tb->cm_ops->approve_switch(tb, sw); | |
697 | ||
698 | err_free_shash: | |
699 | kfree(shash); | |
700 | err_free_tfm: | |
701 | crypto_free_shash(tfm); | |
702 | ||
703 | return ret; | |
704 | } | |
705 | ||
e6b245cc MW |
706 | /** |
707 | * tb_domain_disconnect_pcie_paths() - Disconnect all PCIe paths | |
708 | * @tb: Domain whose PCIe paths to disconnect | |
709 | * | |
710 | * This needs to be called in preparation for NVM upgrade of the host | |
711 | * controller. Makes sure all PCIe paths are disconnected. | |
712 | * | |
713 | * Return %0 on success and negative errno in case of error. | |
714 | */ | |
715 | int tb_domain_disconnect_pcie_paths(struct tb *tb) | |
716 | { | |
717 | if (!tb->cm_ops->disconnect_pcie_paths) | |
718 | return -EPERM; | |
719 | ||
720 | return tb->cm_ops->disconnect_pcie_paths(tb); | |
721 | } | |
722 | ||
d1ff7024 MW |
723 | /** |
724 | * tb_domain_approve_xdomain_paths() - Enable DMA paths for XDomain | |
725 | * @tb: Domain enabling the DMA paths | |
726 | * @xd: XDomain DMA paths are created to | |
727 | * | |
728 | * Calls connection manager specific method to enable DMA paths to the | |
729 | * XDomain in question. | |
730 | * | |
731 | * Return: 0% in case of success and negative errno otherwise. In | |
732 | * particular returns %-ENOTSUPP if the connection manager | |
733 | * implementation does not support XDomains. | |
734 | */ | |
735 | int tb_domain_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd) | |
736 | { | |
737 | if (!tb->cm_ops->approve_xdomain_paths) | |
738 | return -ENOTSUPP; | |
739 | ||
740 | return tb->cm_ops->approve_xdomain_paths(tb, xd); | |
741 | } | |
742 | ||
743 | /** | |
744 | * tb_domain_disconnect_xdomain_paths() - Disable DMA paths for XDomain | |
745 | * @tb: Domain disabling the DMA paths | |
746 | * @xd: XDomain whose DMA paths are disconnected | |
747 | * | |
748 | * Calls connection manager specific method to disconnect DMA paths to | |
749 | * the XDomain in question. | |
750 | * | |
751 | * Return: 0% in case of success and negative errno otherwise. In | |
752 | * particular returns %-ENOTSUPP if the connection manager | |
753 | * implementation does not support XDomains. | |
754 | */ | |
755 | int tb_domain_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd) | |
756 | { | |
757 | if (!tb->cm_ops->disconnect_xdomain_paths) | |
758 | return -ENOTSUPP; | |
759 | ||
760 | return tb->cm_ops->disconnect_xdomain_paths(tb, xd); | |
761 | } | |
762 | ||
763 | static int disconnect_xdomain(struct device *dev, void *data) | |
764 | { | |
765 | struct tb_xdomain *xd; | |
766 | struct tb *tb = data; | |
767 | int ret = 0; | |
768 | ||
769 | xd = tb_to_xdomain(dev); | |
770 | if (xd && xd->tb == tb) | |
771 | ret = tb_xdomain_disable_paths(xd); | |
772 | ||
773 | return ret; | |
774 | } | |
775 | ||
776 | /** | |
777 | * tb_domain_disconnect_all_paths() - Disconnect all paths for the domain | |
778 | * @tb: Domain whose paths are disconnected | |
779 | * | |
780 | * This function can be used to disconnect all paths (PCIe, XDomain) for | |
781 | * example in preparation for host NVM firmware upgrade. After this is | |
782 | * called the paths cannot be established without resetting the switch. | |
783 | * | |
784 | * Return: %0 in case of success and negative errno otherwise. | |
785 | */ | |
786 | int tb_domain_disconnect_all_paths(struct tb *tb) | |
787 | { | |
788 | int ret; | |
789 | ||
790 | ret = tb_domain_disconnect_pcie_paths(tb); | |
791 | if (ret) | |
792 | return ret; | |
793 | ||
794 | return bus_for_each_dev(&tb_bus_type, NULL, tb, disconnect_xdomain); | |
795 | } | |
796 | ||
9d3cce0b MW |
797 | int tb_domain_init(void) |
798 | { | |
d1ff7024 MW |
799 | int ret; |
800 | ||
801 | ret = tb_xdomain_init(); | |
802 | if (ret) | |
803 | return ret; | |
804 | ret = bus_register(&tb_bus_type); | |
805 | if (ret) | |
806 | tb_xdomain_exit(); | |
807 | ||
808 | return ret; | |
9d3cce0b MW |
809 | } |
810 | ||
811 | void tb_domain_exit(void) | |
812 | { | |
813 | bus_unregister(&tb_bus_type); | |
814 | ida_destroy(&tb_domain_ida); | |
e6b245cc | 815 | tb_switch_exit(); |
d1ff7024 | 816 | tb_xdomain_exit(); |
9d3cce0b | 817 | } |