Commit | Line | Data |
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fd3b339c | 1 | // SPDX-License-Identifier: GPL-2.0 |
d1ff7024 MW |
2 | /* |
3 | * Thunderbolt XDomain discovery protocol support | |
4 | * | |
5 | * Copyright (C) 2017, Intel Corporation | |
6 | * Authors: Michael Jamet <michael.jamet@intel.com> | |
7 | * Mika Westerberg <mika.westerberg@linux.intel.com> | |
d1ff7024 MW |
8 | */ |
9 | ||
10 | #include <linux/device.h> | |
5cc0df9c | 11 | #include <linux/delay.h> |
d1ff7024 MW |
12 | #include <linux/kmod.h> |
13 | #include <linux/module.h> | |
2d8ff0b5 | 14 | #include <linux/pm_runtime.h> |
a6932c3f | 15 | #include <linux/prandom.h> |
d1ff7024 MW |
16 | #include <linux/utsname.h> |
17 | #include <linux/uuid.h> | |
18 | #include <linux/workqueue.h> | |
19 | ||
20 | #include "tb.h" | |
21 | ||
3bb16333 | 22 | #define XDOMAIN_DEFAULT_TIMEOUT 1000 /* ms */ |
3b4b3235 | 23 | #define XDOMAIN_UUID_RETRIES 10 |
3bb16333 | 24 | #define XDOMAIN_PROPERTIES_RETRIES 10 |
d1ff7024 | 25 | #define XDOMAIN_PROPERTIES_CHANGED_RETRIES 10 |
5cc0df9c | 26 | #define XDOMAIN_BONDING_WAIT 100 /* ms */ |
46b494f2 | 27 | #define XDOMAIN_DEFAULT_MAX_HOPID 15 |
d1ff7024 MW |
28 | |
29 | struct xdomain_request_work { | |
30 | struct work_struct work; | |
31 | struct tb_xdp_header *pkg; | |
32 | struct tb *tb; | |
33 | }; | |
34 | ||
5ca67688 MW |
35 | static bool tb_xdomain_enabled = true; |
36 | module_param_named(xdomain, tb_xdomain_enabled, bool, 0444); | |
37 | MODULE_PARM_DESC(xdomain, "allow XDomain protocol (default: true)"); | |
38 | ||
46b494f2 MW |
39 | /* |
40 | * Serializes access to the properties and protocol handlers below. If | |
41 | * you need to take both this lock and the struct tb_xdomain lock, take | |
42 | * this one first. | |
43 | */ | |
d1ff7024 MW |
44 | static DEFINE_MUTEX(xdomain_lock); |
45 | ||
46 | /* Properties exposed to the remote domains */ | |
47 | static struct tb_property_dir *xdomain_property_dir; | |
d1ff7024 MW |
48 | static u32 xdomain_property_block_gen; |
49 | ||
50 | /* Additional protocol handlers */ | |
51 | static LIST_HEAD(protocol_handlers); | |
52 | ||
53 | /* UUID for XDomain discovery protocol: b638d70e-42ff-40bb-97c2-90e2c0b2ff07 */ | |
54 | static const uuid_t tb_xdp_uuid = | |
55 | UUID_INIT(0xb638d70e, 0x42ff, 0x40bb, | |
56 | 0x97, 0xc2, 0x90, 0xe2, 0xc0, 0xb2, 0xff, 0x07); | |
57 | ||
5ca67688 MW |
58 | bool tb_is_xdomain_enabled(void) |
59 | { | |
c6da62a2 | 60 | return tb_xdomain_enabled && tb_acpi_is_xdomain_allowed(); |
5ca67688 MW |
61 | } |
62 | ||
d1ff7024 MW |
63 | static bool tb_xdomain_match(const struct tb_cfg_request *req, |
64 | const struct ctl_pkg *pkg) | |
65 | { | |
66 | switch (pkg->frame.eof) { | |
67 | case TB_CFG_PKG_ERROR: | |
68 | return true; | |
69 | ||
70 | case TB_CFG_PKG_XDOMAIN_RESP: { | |
71 | const struct tb_xdp_header *res_hdr = pkg->buffer; | |
72 | const struct tb_xdp_header *req_hdr = req->request; | |
d1ff7024 MW |
73 | |
74 | if (pkg->frame.size < req->response_size / 4) | |
75 | return false; | |
76 | ||
77 | /* Make sure route matches */ | |
78 | if ((res_hdr->xd_hdr.route_hi & ~BIT(31)) != | |
79 | req_hdr->xd_hdr.route_hi) | |
80 | return false; | |
81 | if ((res_hdr->xd_hdr.route_lo) != req_hdr->xd_hdr.route_lo) | |
82 | return false; | |
83 | ||
d1ff7024 MW |
84 | /* Check that the XDomain protocol matches */ |
85 | if (!uuid_equal(&res_hdr->uuid, &req_hdr->uuid)) | |
86 | return false; | |
87 | ||
88 | return true; | |
89 | } | |
90 | ||
91 | default: | |
92 | return false; | |
93 | } | |
94 | } | |
95 | ||
96 | static bool tb_xdomain_copy(struct tb_cfg_request *req, | |
97 | const struct ctl_pkg *pkg) | |
98 | { | |
99 | memcpy(req->response, pkg->buffer, req->response_size); | |
100 | req->result.err = 0; | |
101 | return true; | |
102 | } | |
103 | ||
104 | static void response_ready(void *data) | |
105 | { | |
106 | tb_cfg_request_put(data); | |
107 | } | |
108 | ||
109 | static int __tb_xdomain_response(struct tb_ctl *ctl, const void *response, | |
110 | size_t size, enum tb_cfg_pkg_type type) | |
111 | { | |
112 | struct tb_cfg_request *req; | |
113 | ||
114 | req = tb_cfg_request_alloc(); | |
115 | if (!req) | |
116 | return -ENOMEM; | |
117 | ||
118 | req->match = tb_xdomain_match; | |
119 | req->copy = tb_xdomain_copy; | |
120 | req->request = response; | |
121 | req->request_size = size; | |
122 | req->request_type = type; | |
123 | ||
124 | return tb_cfg_request(ctl, req, response_ready, req); | |
125 | } | |
126 | ||
127 | /** | |
128 | * tb_xdomain_response() - Send a XDomain response message | |
129 | * @xd: XDomain to send the message | |
130 | * @response: Response to send | |
131 | * @size: Size of the response | |
132 | * @type: PDF type of the response | |
133 | * | |
134 | * This can be used to send a XDomain response message to the other | |
135 | * domain. No response for the message is expected. | |
136 | * | |
137 | * Return: %0 in case of success and negative errno in case of failure | |
138 | */ | |
139 | int tb_xdomain_response(struct tb_xdomain *xd, const void *response, | |
140 | size_t size, enum tb_cfg_pkg_type type) | |
141 | { | |
142 | return __tb_xdomain_response(xd->tb->ctl, response, size, type); | |
143 | } | |
144 | EXPORT_SYMBOL_GPL(tb_xdomain_response); | |
145 | ||
146 | static int __tb_xdomain_request(struct tb_ctl *ctl, const void *request, | |
147 | size_t request_size, enum tb_cfg_pkg_type request_type, void *response, | |
148 | size_t response_size, enum tb_cfg_pkg_type response_type, | |
149 | unsigned int timeout_msec) | |
150 | { | |
151 | struct tb_cfg_request *req; | |
152 | struct tb_cfg_result res; | |
153 | ||
154 | req = tb_cfg_request_alloc(); | |
155 | if (!req) | |
156 | return -ENOMEM; | |
157 | ||
158 | req->match = tb_xdomain_match; | |
159 | req->copy = tb_xdomain_copy; | |
160 | req->request = request; | |
161 | req->request_size = request_size; | |
162 | req->request_type = request_type; | |
163 | req->response = response; | |
164 | req->response_size = response_size; | |
165 | req->response_type = response_type; | |
166 | ||
167 | res = tb_cfg_request_sync(ctl, req, timeout_msec); | |
168 | ||
169 | tb_cfg_request_put(req); | |
170 | ||
171 | return res.err == 1 ? -EIO : res.err; | |
172 | } | |
173 | ||
174 | /** | |
175 | * tb_xdomain_request() - Send a XDomain request | |
176 | * @xd: XDomain to send the request | |
177 | * @request: Request to send | |
178 | * @request_size: Size of the request in bytes | |
179 | * @request_type: PDF type of the request | |
180 | * @response: Response is copied here | |
181 | * @response_size: Expected size of the response in bytes | |
182 | * @response_type: Expected PDF type of the response | |
183 | * @timeout_msec: Timeout in milliseconds to wait for the response | |
184 | * | |
185 | * This function can be used to send XDomain control channel messages to | |
186 | * the other domain. The function waits until the response is received | |
187 | * or when timeout triggers. Whichever comes first. | |
188 | * | |
189 | * Return: %0 in case of success and negative errno in case of failure | |
190 | */ | |
191 | int tb_xdomain_request(struct tb_xdomain *xd, const void *request, | |
192 | size_t request_size, enum tb_cfg_pkg_type request_type, | |
193 | void *response, size_t response_size, | |
194 | enum tb_cfg_pkg_type response_type, unsigned int timeout_msec) | |
195 | { | |
196 | return __tb_xdomain_request(xd->tb->ctl, request, request_size, | |
197 | request_type, response, response_size, | |
198 | response_type, timeout_msec); | |
199 | } | |
200 | EXPORT_SYMBOL_GPL(tb_xdomain_request); | |
201 | ||
202 | static inline void tb_xdp_fill_header(struct tb_xdp_header *hdr, u64 route, | |
203 | u8 sequence, enum tb_xdp_type type, size_t size) | |
204 | { | |
205 | u32 length_sn; | |
206 | ||
207 | length_sn = (size - sizeof(hdr->xd_hdr)) / 4; | |
208 | length_sn |= (sequence << TB_XDOMAIN_SN_SHIFT) & TB_XDOMAIN_SN_MASK; | |
209 | ||
210 | hdr->xd_hdr.route_hi = upper_32_bits(route); | |
211 | hdr->xd_hdr.route_lo = lower_32_bits(route); | |
212 | hdr->xd_hdr.length_sn = length_sn; | |
213 | hdr->type = type; | |
214 | memcpy(&hdr->uuid, &tb_xdp_uuid, sizeof(tb_xdp_uuid)); | |
215 | } | |
216 | ||
217 | static int tb_xdp_handle_error(const struct tb_xdp_header *hdr) | |
218 | { | |
219 | const struct tb_xdp_error_response *error; | |
220 | ||
221 | if (hdr->type != ERROR_RESPONSE) | |
222 | return 0; | |
223 | ||
224 | error = (const struct tb_xdp_error_response *)hdr; | |
225 | ||
226 | switch (error->error) { | |
227 | case ERROR_UNKNOWN_PACKET: | |
228 | case ERROR_UNKNOWN_DOMAIN: | |
229 | return -EIO; | |
230 | case ERROR_NOT_SUPPORTED: | |
231 | return -ENOTSUPP; | |
232 | case ERROR_NOT_READY: | |
233 | return -EAGAIN; | |
234 | default: | |
235 | break; | |
236 | } | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
3b4b3235 MW |
241 | static int tb_xdp_uuid_request(struct tb_ctl *ctl, u64 route, int retry, |
242 | uuid_t *uuid) | |
243 | { | |
244 | struct tb_xdp_uuid_response res; | |
245 | struct tb_xdp_uuid req; | |
246 | int ret; | |
247 | ||
248 | memset(&req, 0, sizeof(req)); | |
249 | tb_xdp_fill_header(&req.hdr, route, retry % 4, UUID_REQUEST, | |
250 | sizeof(req)); | |
251 | ||
252 | memset(&res, 0, sizeof(res)); | |
253 | ret = __tb_xdomain_request(ctl, &req, sizeof(req), | |
254 | TB_CFG_PKG_XDOMAIN_REQ, &res, sizeof(res), | |
255 | TB_CFG_PKG_XDOMAIN_RESP, | |
256 | XDOMAIN_DEFAULT_TIMEOUT); | |
257 | if (ret) | |
258 | return ret; | |
259 | ||
260 | ret = tb_xdp_handle_error(&res.hdr); | |
261 | if (ret) | |
262 | return ret; | |
263 | ||
264 | uuid_copy(uuid, &res.src_uuid); | |
265 | return 0; | |
266 | } | |
267 | ||
268 | static int tb_xdp_uuid_response(struct tb_ctl *ctl, u64 route, u8 sequence, | |
269 | const uuid_t *uuid) | |
270 | { | |
271 | struct tb_xdp_uuid_response res; | |
272 | ||
273 | memset(&res, 0, sizeof(res)); | |
274 | tb_xdp_fill_header(&res.hdr, route, sequence, UUID_RESPONSE, | |
275 | sizeof(res)); | |
276 | ||
277 | uuid_copy(&res.src_uuid, uuid); | |
278 | res.src_route_hi = upper_32_bits(route); | |
279 | res.src_route_lo = lower_32_bits(route); | |
280 | ||
281 | return __tb_xdomain_response(ctl, &res, sizeof(res), | |
282 | TB_CFG_PKG_XDOMAIN_RESP); | |
283 | } | |
284 | ||
d1ff7024 MW |
285 | static int tb_xdp_error_response(struct tb_ctl *ctl, u64 route, u8 sequence, |
286 | enum tb_xdp_error error) | |
287 | { | |
288 | struct tb_xdp_error_response res; | |
289 | ||
290 | memset(&res, 0, sizeof(res)); | |
291 | tb_xdp_fill_header(&res.hdr, route, sequence, ERROR_RESPONSE, | |
292 | sizeof(res)); | |
293 | res.error = error; | |
294 | ||
295 | return __tb_xdomain_response(ctl, &res, sizeof(res), | |
296 | TB_CFG_PKG_XDOMAIN_RESP); | |
297 | } | |
298 | ||
299 | static int tb_xdp_properties_request(struct tb_ctl *ctl, u64 route, | |
300 | const uuid_t *src_uuid, const uuid_t *dst_uuid, int retry, | |
301 | u32 **block, u32 *generation) | |
302 | { | |
303 | struct tb_xdp_properties_response *res; | |
304 | struct tb_xdp_properties req; | |
305 | u16 data_len, len; | |
306 | size_t total_size; | |
307 | u32 *data = NULL; | |
308 | int ret; | |
309 | ||
310 | total_size = sizeof(*res) + TB_XDP_PROPERTIES_MAX_DATA_LENGTH * 4; | |
311 | res = kzalloc(total_size, GFP_KERNEL); | |
312 | if (!res) | |
313 | return -ENOMEM; | |
314 | ||
315 | memset(&req, 0, sizeof(req)); | |
316 | tb_xdp_fill_header(&req.hdr, route, retry % 4, PROPERTIES_REQUEST, | |
317 | sizeof(req)); | |
318 | memcpy(&req.src_uuid, src_uuid, sizeof(*src_uuid)); | |
319 | memcpy(&req.dst_uuid, dst_uuid, sizeof(*dst_uuid)); | |
320 | ||
321 | len = 0; | |
322 | data_len = 0; | |
323 | ||
324 | do { | |
325 | ret = __tb_xdomain_request(ctl, &req, sizeof(req), | |
326 | TB_CFG_PKG_XDOMAIN_REQ, res, | |
327 | total_size, TB_CFG_PKG_XDOMAIN_RESP, | |
328 | XDOMAIN_DEFAULT_TIMEOUT); | |
329 | if (ret) | |
330 | goto err; | |
331 | ||
332 | ret = tb_xdp_handle_error(&res->hdr); | |
333 | if (ret) | |
334 | goto err; | |
335 | ||
336 | /* | |
337 | * Package length includes the whole payload without the | |
338 | * XDomain header. Validate first that the package is at | |
339 | * least size of the response structure. | |
340 | */ | |
341 | len = res->hdr.xd_hdr.length_sn & TB_XDOMAIN_LENGTH_MASK; | |
342 | if (len < sizeof(*res) / 4) { | |
343 | ret = -EINVAL; | |
344 | goto err; | |
345 | } | |
346 | ||
347 | len += sizeof(res->hdr.xd_hdr) / 4; | |
348 | len -= sizeof(*res) / 4; | |
349 | ||
350 | if (res->offset != req.offset) { | |
351 | ret = -EINVAL; | |
352 | goto err; | |
353 | } | |
354 | ||
355 | /* | |
356 | * First time allocate block that has enough space for | |
357 | * the whole properties block. | |
358 | */ | |
359 | if (!data) { | |
360 | data_len = res->data_length; | |
361 | if (data_len > TB_XDP_PROPERTIES_MAX_LENGTH) { | |
362 | ret = -E2BIG; | |
363 | goto err; | |
364 | } | |
365 | ||
366 | data = kcalloc(data_len, sizeof(u32), GFP_KERNEL); | |
367 | if (!data) { | |
368 | ret = -ENOMEM; | |
369 | goto err; | |
370 | } | |
371 | } | |
372 | ||
373 | memcpy(data + req.offset, res->data, len * 4); | |
374 | req.offset += len; | |
375 | } while (!data_len || req.offset < data_len); | |
376 | ||
377 | *block = data; | |
378 | *generation = res->generation; | |
379 | ||
380 | kfree(res); | |
381 | ||
382 | return data_len; | |
383 | ||
384 | err: | |
385 | kfree(data); | |
386 | kfree(res); | |
387 | ||
388 | return ret; | |
389 | } | |
390 | ||
391 | static int tb_xdp_properties_response(struct tb *tb, struct tb_ctl *ctl, | |
46b494f2 | 392 | struct tb_xdomain *xd, u8 sequence, const struct tb_xdp_properties *req) |
d1ff7024 MW |
393 | { |
394 | struct tb_xdp_properties_response *res; | |
395 | size_t total_size; | |
396 | u16 len; | |
397 | int ret; | |
398 | ||
399 | /* | |
400 | * Currently we expect all requests to be directed to us. The | |
401 | * protocol supports forwarding, though which we might add | |
402 | * support later on. | |
403 | */ | |
46b494f2 MW |
404 | if (!uuid_equal(xd->local_uuid, &req->dst_uuid)) { |
405 | tb_xdp_error_response(ctl, xd->route, sequence, | |
d1ff7024 MW |
406 | ERROR_UNKNOWN_DOMAIN); |
407 | return 0; | |
408 | } | |
409 | ||
46b494f2 | 410 | mutex_lock(&xd->lock); |
d1ff7024 | 411 | |
46b494f2 MW |
412 | if (req->offset >= xd->local_property_block_len) { |
413 | mutex_unlock(&xd->lock); | |
d1ff7024 MW |
414 | return -EINVAL; |
415 | } | |
416 | ||
46b494f2 | 417 | len = xd->local_property_block_len - req->offset; |
d1ff7024 MW |
418 | len = min_t(u16, len, TB_XDP_PROPERTIES_MAX_DATA_LENGTH); |
419 | total_size = sizeof(*res) + len * 4; | |
420 | ||
421 | res = kzalloc(total_size, GFP_KERNEL); | |
422 | if (!res) { | |
46b494f2 | 423 | mutex_unlock(&xd->lock); |
d1ff7024 MW |
424 | return -ENOMEM; |
425 | } | |
426 | ||
46b494f2 | 427 | tb_xdp_fill_header(&res->hdr, xd->route, sequence, PROPERTIES_RESPONSE, |
d1ff7024 | 428 | total_size); |
46b494f2 MW |
429 | res->generation = xd->local_property_block_gen; |
430 | res->data_length = xd->local_property_block_len; | |
d1ff7024 | 431 | res->offset = req->offset; |
46b494f2 | 432 | uuid_copy(&res->src_uuid, xd->local_uuid); |
d1ff7024 | 433 | uuid_copy(&res->dst_uuid, &req->src_uuid); |
46b494f2 | 434 | memcpy(res->data, &xd->local_property_block[req->offset], len * 4); |
d1ff7024 | 435 | |
46b494f2 | 436 | mutex_unlock(&xd->lock); |
d1ff7024 MW |
437 | |
438 | ret = __tb_xdomain_response(ctl, res, total_size, | |
439 | TB_CFG_PKG_XDOMAIN_RESP); | |
440 | ||
441 | kfree(res); | |
442 | return ret; | |
443 | } | |
444 | ||
445 | static int tb_xdp_properties_changed_request(struct tb_ctl *ctl, u64 route, | |
446 | int retry, const uuid_t *uuid) | |
447 | { | |
448 | struct tb_xdp_properties_changed_response res; | |
449 | struct tb_xdp_properties_changed req; | |
450 | int ret; | |
451 | ||
452 | memset(&req, 0, sizeof(req)); | |
453 | tb_xdp_fill_header(&req.hdr, route, retry % 4, | |
454 | PROPERTIES_CHANGED_REQUEST, sizeof(req)); | |
455 | uuid_copy(&req.src_uuid, uuid); | |
456 | ||
457 | memset(&res, 0, sizeof(res)); | |
458 | ret = __tb_xdomain_request(ctl, &req, sizeof(req), | |
459 | TB_CFG_PKG_XDOMAIN_REQ, &res, sizeof(res), | |
460 | TB_CFG_PKG_XDOMAIN_RESP, | |
461 | XDOMAIN_DEFAULT_TIMEOUT); | |
462 | if (ret) | |
463 | return ret; | |
464 | ||
465 | return tb_xdp_handle_error(&res.hdr); | |
466 | } | |
467 | ||
468 | static int | |
469 | tb_xdp_properties_changed_response(struct tb_ctl *ctl, u64 route, u8 sequence) | |
470 | { | |
471 | struct tb_xdp_properties_changed_response res; | |
472 | ||
473 | memset(&res, 0, sizeof(res)); | |
474 | tb_xdp_fill_header(&res.hdr, route, sequence, | |
475 | PROPERTIES_CHANGED_RESPONSE, sizeof(res)); | |
476 | return __tb_xdomain_response(ctl, &res, sizeof(res), | |
477 | TB_CFG_PKG_XDOMAIN_RESP); | |
478 | } | |
479 | ||
480 | /** | |
481 | * tb_register_protocol_handler() - Register protocol handler | |
482 | * @handler: Handler to register | |
483 | * | |
484 | * This allows XDomain service drivers to hook into incoming XDomain | |
485 | * messages. After this function is called the service driver needs to | |
486 | * be able to handle calls to callback whenever a package with the | |
487 | * registered protocol is received. | |
488 | */ | |
489 | int tb_register_protocol_handler(struct tb_protocol_handler *handler) | |
490 | { | |
491 | if (!handler->uuid || !handler->callback) | |
492 | return -EINVAL; | |
493 | if (uuid_equal(handler->uuid, &tb_xdp_uuid)) | |
494 | return -EINVAL; | |
495 | ||
496 | mutex_lock(&xdomain_lock); | |
497 | list_add_tail(&handler->list, &protocol_handlers); | |
498 | mutex_unlock(&xdomain_lock); | |
499 | ||
500 | return 0; | |
501 | } | |
502 | EXPORT_SYMBOL_GPL(tb_register_protocol_handler); | |
503 | ||
504 | /** | |
505 | * tb_unregister_protocol_handler() - Unregister protocol handler | |
506 | * @handler: Handler to unregister | |
507 | * | |
508 | * Removes the previously registered protocol handler. | |
509 | */ | |
510 | void tb_unregister_protocol_handler(struct tb_protocol_handler *handler) | |
511 | { | |
512 | mutex_lock(&xdomain_lock); | |
513 | list_del_init(&handler->list); | |
514 | mutex_unlock(&xdomain_lock); | |
515 | } | |
516 | EXPORT_SYMBOL_GPL(tb_unregister_protocol_handler); | |
517 | ||
46b494f2 | 518 | static void update_property_block(struct tb_xdomain *xd) |
8a00c67e | 519 | { |
46b494f2 MW |
520 | mutex_lock(&xdomain_lock); |
521 | mutex_lock(&xd->lock); | |
522 | /* | |
523 | * If the local property block is not up-to-date, rebuild it now | |
524 | * based on the global property template. | |
525 | */ | |
526 | if (!xd->local_property_block || | |
527 | xd->local_property_block_gen < xdomain_property_block_gen) { | |
528 | struct tb_property_dir *dir; | |
529 | int ret, block_len; | |
530 | u32 *block; | |
531 | ||
532 | dir = tb_property_copy_dir(xdomain_property_dir); | |
533 | if (!dir) { | |
534 | dev_warn(&xd->dev, "failed to copy properties\n"); | |
535 | goto out_unlock; | |
536 | } | |
8a00c67e | 537 | |
46b494f2 MW |
538 | /* Fill in non-static properties now */ |
539 | tb_property_add_text(dir, "deviceid", utsname()->nodename); | |
540 | tb_property_add_immediate(dir, "maxhopid", xd->local_max_hopid); | |
8a00c67e | 541 | |
46b494f2 MW |
542 | ret = tb_property_format_dir(dir, NULL, 0); |
543 | if (ret < 0) { | |
544 | dev_warn(&xd->dev, "local property block creation failed\n"); | |
545 | tb_property_free_dir(dir); | |
546 | goto out_unlock; | |
547 | } | |
8a00c67e | 548 | |
46b494f2 MW |
549 | block_len = ret; |
550 | block = kcalloc(block_len, sizeof(*block), GFP_KERNEL); | |
551 | if (!block) { | |
552 | tb_property_free_dir(dir); | |
553 | goto out_unlock; | |
554 | } | |
8a00c67e | 555 | |
46b494f2 MW |
556 | ret = tb_property_format_dir(dir, block, block_len); |
557 | if (ret) { | |
558 | dev_warn(&xd->dev, "property block generation failed\n"); | |
559 | tb_property_free_dir(dir); | |
560 | kfree(block); | |
561 | goto out_unlock; | |
562 | } | |
8a00c67e | 563 | |
46b494f2 MW |
564 | tb_property_free_dir(dir); |
565 | /* Release the previous block */ | |
566 | kfree(xd->local_property_block); | |
567 | /* Assign new one */ | |
568 | xd->local_property_block = block; | |
569 | xd->local_property_block_len = block_len; | |
570 | xd->local_property_block_gen = xdomain_property_block_gen; | |
8a00c67e | 571 | } |
46b494f2 MW |
572 | |
573 | out_unlock: | |
574 | mutex_unlock(&xd->lock); | |
8a00c67e MW |
575 | mutex_unlock(&xdomain_lock); |
576 | } | |
577 | ||
d1ff7024 MW |
578 | static void tb_xdp_handle_request(struct work_struct *work) |
579 | { | |
580 | struct xdomain_request_work *xw = container_of(work, typeof(*xw), work); | |
581 | const struct tb_xdp_header *pkg = xw->pkg; | |
582 | const struct tb_xdomain_header *xhdr = &pkg->xd_hdr; | |
583 | struct tb *tb = xw->tb; | |
584 | struct tb_ctl *ctl = tb->ctl; | |
46b494f2 | 585 | struct tb_xdomain *xd; |
d1ff7024 MW |
586 | const uuid_t *uuid; |
587 | int ret = 0; | |
9a03c3d3 | 588 | u32 sequence; |
d1ff7024 MW |
589 | u64 route; |
590 | ||
591 | route = ((u64)xhdr->route_hi << 32 | xhdr->route_lo) & ~BIT_ULL(63); | |
592 | sequence = xhdr->length_sn & TB_XDOMAIN_SN_MASK; | |
593 | sequence >>= TB_XDOMAIN_SN_SHIFT; | |
594 | ||
595 | mutex_lock(&tb->lock); | |
596 | if (tb->root_switch) | |
597 | uuid = tb->root_switch->uuid; | |
598 | else | |
599 | uuid = NULL; | |
600 | mutex_unlock(&tb->lock); | |
601 | ||
602 | if (!uuid) { | |
603 | tb_xdp_error_response(ctl, route, sequence, ERROR_NOT_READY); | |
604 | goto out; | |
605 | } | |
606 | ||
d29c59b1 MW |
607 | tb_dbg(tb, "%llx: received XDomain request %#x\n", route, pkg->type); |
608 | ||
46b494f2 MW |
609 | xd = tb_xdomain_find_by_route_locked(tb, route); |
610 | if (xd) | |
611 | update_property_block(xd); | |
612 | ||
d1ff7024 MW |
613 | switch (pkg->type) { |
614 | case PROPERTIES_REQUEST: | |
46b494f2 MW |
615 | if (xd) { |
616 | ret = tb_xdp_properties_response(tb, ctl, xd, sequence, | |
617 | (const struct tb_xdp_properties *)pkg); | |
618 | } | |
d1ff7024 MW |
619 | break; |
620 | ||
46b494f2 | 621 | case PROPERTIES_CHANGED_REQUEST: |
d1ff7024 MW |
622 | ret = tb_xdp_properties_changed_response(ctl, route, sequence); |
623 | ||
624 | /* | |
625 | * Since the properties have been changed, let's update | |
626 | * the xdomain related to this connection as well in | |
627 | * case there is a change in services it offers. | |
628 | */ | |
46b494f2 MW |
629 | if (xd && device_is_registered(&xd->dev)) { |
630 | queue_delayed_work(tb->wq, &xd->get_properties_work, | |
631 | msecs_to_jiffies(50)); | |
d1ff7024 | 632 | } |
d1ff7024 | 633 | break; |
d1ff7024 | 634 | |
3b4b3235 MW |
635 | case UUID_REQUEST_OLD: |
636 | case UUID_REQUEST: | |
637 | ret = tb_xdp_uuid_response(ctl, route, sequence, uuid); | |
638 | break; | |
639 | ||
d1ff7024 | 640 | default: |
3b4b3235 MW |
641 | tb_xdp_error_response(ctl, route, sequence, |
642 | ERROR_NOT_SUPPORTED); | |
d1ff7024 MW |
643 | break; |
644 | } | |
645 | ||
46b494f2 MW |
646 | tb_xdomain_put(xd); |
647 | ||
d1ff7024 MW |
648 | if (ret) { |
649 | tb_warn(tb, "failed to send XDomain response for %#x\n", | |
650 | pkg->type); | |
651 | } | |
652 | ||
653 | out: | |
654 | kfree(xw->pkg); | |
655 | kfree(xw); | |
559c1e1e MW |
656 | |
657 | tb_domain_put(tb); | |
d1ff7024 MW |
658 | } |
659 | ||
48f40b96 | 660 | static bool |
d1ff7024 MW |
661 | tb_xdp_schedule_request(struct tb *tb, const struct tb_xdp_header *hdr, |
662 | size_t size) | |
663 | { | |
664 | struct xdomain_request_work *xw; | |
665 | ||
666 | xw = kmalloc(sizeof(*xw), GFP_KERNEL); | |
667 | if (!xw) | |
48f40b96 | 668 | return false; |
d1ff7024 MW |
669 | |
670 | INIT_WORK(&xw->work, tb_xdp_handle_request); | |
671 | xw->pkg = kmemdup(hdr, size, GFP_KERNEL); | |
48f40b96 AP |
672 | if (!xw->pkg) { |
673 | kfree(xw); | |
674 | return false; | |
675 | } | |
559c1e1e | 676 | xw->tb = tb_domain_get(tb); |
d1ff7024 | 677 | |
559c1e1e | 678 | schedule_work(&xw->work); |
48f40b96 | 679 | return true; |
d1ff7024 MW |
680 | } |
681 | ||
682 | /** | |
683 | * tb_register_service_driver() - Register XDomain service driver | |
684 | * @drv: Driver to register | |
685 | * | |
686 | * Registers new service driver from @drv to the bus. | |
687 | */ | |
688 | int tb_register_service_driver(struct tb_service_driver *drv) | |
689 | { | |
690 | drv->driver.bus = &tb_bus_type; | |
691 | return driver_register(&drv->driver); | |
692 | } | |
693 | EXPORT_SYMBOL_GPL(tb_register_service_driver); | |
694 | ||
695 | /** | |
696 | * tb_unregister_service_driver() - Unregister XDomain service driver | |
925a2af9 | 697 | * @drv: Driver to unregister |
d1ff7024 MW |
698 | * |
699 | * Unregisters XDomain service driver from the bus. | |
700 | */ | |
701 | void tb_unregister_service_driver(struct tb_service_driver *drv) | |
702 | { | |
703 | driver_unregister(&drv->driver); | |
704 | } | |
705 | EXPORT_SYMBOL_GPL(tb_unregister_service_driver); | |
706 | ||
707 | static ssize_t key_show(struct device *dev, struct device_attribute *attr, | |
708 | char *buf) | |
709 | { | |
710 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
711 | ||
712 | /* | |
713 | * It should be null terminated but anything else is pretty much | |
714 | * allowed. | |
715 | */ | |
04f77453 | 716 | return sprintf(buf, "%*pE\n", (int)strlen(svc->key), svc->key); |
d1ff7024 MW |
717 | } |
718 | static DEVICE_ATTR_RO(key); | |
719 | ||
720 | static int get_modalias(struct tb_service *svc, char *buf, size_t size) | |
721 | { | |
722 | return snprintf(buf, size, "tbsvc:k%sp%08Xv%08Xr%08X", svc->key, | |
723 | svc->prtcid, svc->prtcvers, svc->prtcrevs); | |
724 | } | |
725 | ||
726 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | |
727 | char *buf) | |
728 | { | |
729 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
730 | ||
731 | /* Full buffer size except new line and null termination */ | |
732 | get_modalias(svc, buf, PAGE_SIZE - 2); | |
733 | return sprintf(buf, "%s\n", buf); | |
734 | } | |
735 | static DEVICE_ATTR_RO(modalias); | |
736 | ||
737 | static ssize_t prtcid_show(struct device *dev, struct device_attribute *attr, | |
738 | char *buf) | |
739 | { | |
740 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
741 | ||
742 | return sprintf(buf, "%u\n", svc->prtcid); | |
743 | } | |
744 | static DEVICE_ATTR_RO(prtcid); | |
745 | ||
746 | static ssize_t prtcvers_show(struct device *dev, struct device_attribute *attr, | |
747 | char *buf) | |
748 | { | |
749 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
750 | ||
751 | return sprintf(buf, "%u\n", svc->prtcvers); | |
752 | } | |
753 | static DEVICE_ATTR_RO(prtcvers); | |
754 | ||
755 | static ssize_t prtcrevs_show(struct device *dev, struct device_attribute *attr, | |
756 | char *buf) | |
757 | { | |
758 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
759 | ||
760 | return sprintf(buf, "%u\n", svc->prtcrevs); | |
761 | } | |
762 | static DEVICE_ATTR_RO(prtcrevs); | |
763 | ||
764 | static ssize_t prtcstns_show(struct device *dev, struct device_attribute *attr, | |
765 | char *buf) | |
766 | { | |
767 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
768 | ||
769 | return sprintf(buf, "0x%08x\n", svc->prtcstns); | |
770 | } | |
771 | static DEVICE_ATTR_RO(prtcstns); | |
772 | ||
773 | static struct attribute *tb_service_attrs[] = { | |
774 | &dev_attr_key.attr, | |
775 | &dev_attr_modalias.attr, | |
776 | &dev_attr_prtcid.attr, | |
777 | &dev_attr_prtcvers.attr, | |
778 | &dev_attr_prtcrevs.attr, | |
779 | &dev_attr_prtcstns.attr, | |
780 | NULL, | |
781 | }; | |
782 | ||
6889e00f | 783 | static const struct attribute_group tb_service_attr_group = { |
d1ff7024 MW |
784 | .attrs = tb_service_attrs, |
785 | }; | |
786 | ||
787 | static const struct attribute_group *tb_service_attr_groups[] = { | |
788 | &tb_service_attr_group, | |
789 | NULL, | |
790 | }; | |
791 | ||
792 | static int tb_service_uevent(struct device *dev, struct kobj_uevent_env *env) | |
793 | { | |
794 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
795 | char modalias[64]; | |
796 | ||
797 | get_modalias(svc, modalias, sizeof(modalias)); | |
798 | return add_uevent_var(env, "MODALIAS=%s", modalias); | |
799 | } | |
800 | ||
801 | static void tb_service_release(struct device *dev) | |
802 | { | |
803 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
804 | struct tb_xdomain *xd = tb_service_parent(svc); | |
805 | ||
407ac931 | 806 | tb_service_debugfs_remove(svc); |
d1ff7024 MW |
807 | ida_simple_remove(&xd->service_ids, svc->id); |
808 | kfree(svc->key); | |
809 | kfree(svc); | |
810 | } | |
811 | ||
812 | struct device_type tb_service_type = { | |
813 | .name = "thunderbolt_service", | |
814 | .groups = tb_service_attr_groups, | |
815 | .uevent = tb_service_uevent, | |
816 | .release = tb_service_release, | |
817 | }; | |
818 | EXPORT_SYMBOL_GPL(tb_service_type); | |
819 | ||
820 | static int remove_missing_service(struct device *dev, void *data) | |
821 | { | |
822 | struct tb_xdomain *xd = data; | |
823 | struct tb_service *svc; | |
824 | ||
825 | svc = tb_to_service(dev); | |
826 | if (!svc) | |
827 | return 0; | |
828 | ||
46b494f2 | 829 | if (!tb_property_find(xd->remote_properties, svc->key, |
d1ff7024 MW |
830 | TB_PROPERTY_TYPE_DIRECTORY)) |
831 | device_unregister(dev); | |
832 | ||
833 | return 0; | |
834 | } | |
835 | ||
836 | static int find_service(struct device *dev, void *data) | |
837 | { | |
838 | const struct tb_property *p = data; | |
839 | struct tb_service *svc; | |
840 | ||
841 | svc = tb_to_service(dev); | |
842 | if (!svc) | |
843 | return 0; | |
844 | ||
845 | return !strcmp(svc->key, p->key); | |
846 | } | |
847 | ||
848 | static int populate_service(struct tb_service *svc, | |
849 | struct tb_property *property) | |
850 | { | |
851 | struct tb_property_dir *dir = property->value.dir; | |
852 | struct tb_property *p; | |
853 | ||
854 | /* Fill in standard properties */ | |
855 | p = tb_property_find(dir, "prtcid", TB_PROPERTY_TYPE_VALUE); | |
856 | if (p) | |
857 | svc->prtcid = p->value.immediate; | |
858 | p = tb_property_find(dir, "prtcvers", TB_PROPERTY_TYPE_VALUE); | |
859 | if (p) | |
860 | svc->prtcvers = p->value.immediate; | |
861 | p = tb_property_find(dir, "prtcrevs", TB_PROPERTY_TYPE_VALUE); | |
862 | if (p) | |
863 | svc->prtcrevs = p->value.immediate; | |
864 | p = tb_property_find(dir, "prtcstns", TB_PROPERTY_TYPE_VALUE); | |
865 | if (p) | |
866 | svc->prtcstns = p->value.immediate; | |
867 | ||
868 | svc->key = kstrdup(property->key, GFP_KERNEL); | |
869 | if (!svc->key) | |
870 | return -ENOMEM; | |
871 | ||
872 | return 0; | |
873 | } | |
874 | ||
875 | static void enumerate_services(struct tb_xdomain *xd) | |
876 | { | |
877 | struct tb_service *svc; | |
878 | struct tb_property *p; | |
879 | struct device *dev; | |
9aabb685 | 880 | int id; |
d1ff7024 MW |
881 | |
882 | /* | |
883 | * First remove all services that are not available anymore in | |
884 | * the updated property block. | |
885 | */ | |
886 | device_for_each_child_reverse(&xd->dev, xd, remove_missing_service); | |
887 | ||
888 | /* Then re-enumerate properties creating new services as we go */ | |
46b494f2 | 889 | tb_property_for_each(xd->remote_properties, p) { |
d1ff7024 MW |
890 | if (p->type != TB_PROPERTY_TYPE_DIRECTORY) |
891 | continue; | |
892 | ||
893 | /* If the service exists already we are fine */ | |
894 | dev = device_find_child(&xd->dev, p, find_service); | |
895 | if (dev) { | |
896 | put_device(dev); | |
897 | continue; | |
898 | } | |
899 | ||
900 | svc = kzalloc(sizeof(*svc), GFP_KERNEL); | |
901 | if (!svc) | |
902 | break; | |
903 | ||
904 | if (populate_service(svc, p)) { | |
905 | kfree(svc); | |
906 | break; | |
907 | } | |
908 | ||
9aabb685 AP |
909 | id = ida_simple_get(&xd->service_ids, 0, 0, GFP_KERNEL); |
910 | if (id < 0) { | |
a663e0df | 911 | kfree(svc->key); |
9aabb685 AP |
912 | kfree(svc); |
913 | break; | |
914 | } | |
915 | svc->id = id; | |
d1ff7024 MW |
916 | svc->dev.bus = &tb_bus_type; |
917 | svc->dev.type = &tb_service_type; | |
918 | svc->dev.parent = &xd->dev; | |
919 | dev_set_name(&svc->dev, "%s.%d", dev_name(&xd->dev), svc->id); | |
920 | ||
407ac931 MW |
921 | tb_service_debugfs_init(svc); |
922 | ||
d1ff7024 MW |
923 | if (device_register(&svc->dev)) { |
924 | put_device(&svc->dev); | |
925 | break; | |
926 | } | |
927 | } | |
928 | } | |
929 | ||
930 | static int populate_properties(struct tb_xdomain *xd, | |
931 | struct tb_property_dir *dir) | |
932 | { | |
933 | const struct tb_property *p; | |
934 | ||
935 | /* Required properties */ | |
936 | p = tb_property_find(dir, "deviceid", TB_PROPERTY_TYPE_VALUE); | |
937 | if (!p) | |
938 | return -EINVAL; | |
939 | xd->device = p->value.immediate; | |
940 | ||
941 | p = tb_property_find(dir, "vendorid", TB_PROPERTY_TYPE_VALUE); | |
942 | if (!p) | |
943 | return -EINVAL; | |
944 | xd->vendor = p->value.immediate; | |
945 | ||
46b494f2 MW |
946 | p = tb_property_find(dir, "maxhopid", TB_PROPERTY_TYPE_VALUE); |
947 | /* | |
948 | * USB4 inter-domain spec suggests using 15 as HopID if the | |
949 | * other end does not announce it in a property. This is for | |
950 | * TBT3 compatibility. | |
951 | */ | |
952 | xd->remote_max_hopid = p ? p->value.immediate : XDOMAIN_DEFAULT_MAX_HOPID; | |
953 | ||
d1ff7024 MW |
954 | kfree(xd->device_name); |
955 | xd->device_name = NULL; | |
956 | kfree(xd->vendor_name); | |
957 | xd->vendor_name = NULL; | |
958 | ||
959 | /* Optional properties */ | |
960 | p = tb_property_find(dir, "deviceid", TB_PROPERTY_TYPE_TEXT); | |
961 | if (p) | |
962 | xd->device_name = kstrdup(p->value.text, GFP_KERNEL); | |
963 | p = tb_property_find(dir, "vendorid", TB_PROPERTY_TYPE_TEXT); | |
964 | if (p) | |
965 | xd->vendor_name = kstrdup(p->value.text, GFP_KERNEL); | |
966 | ||
967 | return 0; | |
968 | } | |
969 | ||
4210d50f IH |
970 | static inline struct tb_switch *tb_xdomain_parent(struct tb_xdomain *xd) |
971 | { | |
972 | return tb_to_switch(xd->dev.parent); | |
973 | } | |
974 | ||
975 | static int tb_xdomain_update_link_attributes(struct tb_xdomain *xd) | |
976 | { | |
977 | bool change = false; | |
978 | struct tb_port *port; | |
979 | int ret; | |
980 | ||
981 | port = tb_port_at(xd->route, tb_xdomain_parent(xd)); | |
982 | ||
983 | ret = tb_port_get_link_speed(port); | |
984 | if (ret < 0) | |
985 | return ret; | |
986 | ||
987 | if (xd->link_speed != ret) | |
988 | change = true; | |
989 | ||
990 | xd->link_speed = ret; | |
991 | ||
992 | ret = tb_port_get_link_width(port); | |
993 | if (ret < 0) | |
994 | return ret; | |
995 | ||
996 | if (xd->link_width != ret) | |
997 | change = true; | |
998 | ||
999 | xd->link_width = ret; | |
1000 | ||
1001 | if (change) | |
1002 | kobject_uevent(&xd->dev.kobj, KOBJ_CHANGE); | |
1003 | ||
1004 | return 0; | |
1005 | } | |
1006 | ||
3b4b3235 MW |
1007 | static void tb_xdomain_get_uuid(struct work_struct *work) |
1008 | { | |
1009 | struct tb_xdomain *xd = container_of(work, typeof(*xd), | |
1010 | get_uuid_work.work); | |
1011 | struct tb *tb = xd->tb; | |
1012 | uuid_t uuid; | |
1013 | int ret; | |
1014 | ||
d29c59b1 MW |
1015 | dev_dbg(&xd->dev, "requesting remote UUID\n"); |
1016 | ||
3b4b3235 MW |
1017 | ret = tb_xdp_uuid_request(tb->ctl, xd->route, xd->uuid_retries, &uuid); |
1018 | if (ret < 0) { | |
1019 | if (xd->uuid_retries-- > 0) { | |
d29c59b1 | 1020 | dev_dbg(&xd->dev, "failed to request UUID, retrying\n"); |
3b4b3235 MW |
1021 | queue_delayed_work(xd->tb->wq, &xd->get_uuid_work, |
1022 | msecs_to_jiffies(100)); | |
1023 | } else { | |
1024 | dev_dbg(&xd->dev, "failed to read remote UUID\n"); | |
1025 | } | |
1026 | return; | |
1027 | } | |
1028 | ||
d29c59b1 MW |
1029 | dev_dbg(&xd->dev, "got remote UUID %pUb\n", &uuid); |
1030 | ||
47844ecb | 1031 | if (uuid_equal(&uuid, xd->local_uuid)) |
3b4b3235 | 1032 | dev_dbg(&xd->dev, "intra-domain loop detected\n"); |
3b4b3235 MW |
1033 | |
1034 | /* | |
1035 | * If the UUID is different, there is another domain connected | |
1036 | * so mark this one unplugged and wait for the connection | |
1037 | * manager to replace it. | |
1038 | */ | |
1039 | if (xd->remote_uuid && !uuid_equal(&uuid, xd->remote_uuid)) { | |
1040 | dev_dbg(&xd->dev, "remote UUID is different, unplugging\n"); | |
1041 | xd->is_unplugged = true; | |
1042 | return; | |
1043 | } | |
1044 | ||
1045 | /* First time fill in the missing UUID */ | |
1046 | if (!xd->remote_uuid) { | |
1047 | xd->remote_uuid = kmemdup(&uuid, sizeof(uuid_t), GFP_KERNEL); | |
1048 | if (!xd->remote_uuid) | |
1049 | return; | |
1050 | } | |
1051 | ||
1052 | /* Now we can start the normal properties exchange */ | |
1053 | queue_delayed_work(xd->tb->wq, &xd->properties_changed_work, | |
1054 | msecs_to_jiffies(100)); | |
1055 | queue_delayed_work(xd->tb->wq, &xd->get_properties_work, | |
1056 | msecs_to_jiffies(1000)); | |
1057 | } | |
1058 | ||
d1ff7024 MW |
1059 | static void tb_xdomain_get_properties(struct work_struct *work) |
1060 | { | |
1061 | struct tb_xdomain *xd = container_of(work, typeof(*xd), | |
1062 | get_properties_work.work); | |
1063 | struct tb_property_dir *dir; | |
1064 | struct tb *tb = xd->tb; | |
1065 | bool update = false; | |
1066 | u32 *block = NULL; | |
1067 | u32 gen = 0; | |
1068 | int ret; | |
1069 | ||
d29c59b1 MW |
1070 | dev_dbg(&xd->dev, "requesting remote properties\n"); |
1071 | ||
d1ff7024 MW |
1072 | ret = tb_xdp_properties_request(tb->ctl, xd->route, xd->local_uuid, |
1073 | xd->remote_uuid, xd->properties_retries, | |
1074 | &block, &gen); | |
1075 | if (ret < 0) { | |
1076 | if (xd->properties_retries-- > 0) { | |
d29c59b1 MW |
1077 | dev_dbg(&xd->dev, |
1078 | "failed to request remote properties, retrying\n"); | |
d1ff7024 MW |
1079 | queue_delayed_work(xd->tb->wq, &xd->get_properties_work, |
1080 | msecs_to_jiffies(1000)); | |
1081 | } else { | |
1082 | /* Give up now */ | |
1083 | dev_err(&xd->dev, | |
1084 | "failed read XDomain properties from %pUb\n", | |
1085 | xd->remote_uuid); | |
1086 | } | |
1087 | return; | |
1088 | } | |
1089 | ||
1090 | xd->properties_retries = XDOMAIN_PROPERTIES_RETRIES; | |
1091 | ||
1092 | mutex_lock(&xd->lock); | |
1093 | ||
1094 | /* Only accept newer generation properties */ | |
46b494f2 | 1095 | if (xd->remote_properties && gen <= xd->remote_property_block_gen) |
d1ff7024 | 1096 | goto err_free_block; |
d1ff7024 MW |
1097 | |
1098 | dir = tb_property_parse_dir(block, ret); | |
1099 | if (!dir) { | |
1100 | dev_err(&xd->dev, "failed to parse XDomain properties\n"); | |
1101 | goto err_free_block; | |
1102 | } | |
1103 | ||
1104 | ret = populate_properties(xd, dir); | |
1105 | if (ret) { | |
1106 | dev_err(&xd->dev, "missing XDomain properties in response\n"); | |
1107 | goto err_free_dir; | |
1108 | } | |
1109 | ||
1110 | /* Release the existing one */ | |
46b494f2 MW |
1111 | if (xd->remote_properties) { |
1112 | tb_property_free_dir(xd->remote_properties); | |
d1ff7024 MW |
1113 | update = true; |
1114 | } | |
1115 | ||
46b494f2 MW |
1116 | xd->remote_properties = dir; |
1117 | xd->remote_property_block_gen = gen; | |
d1ff7024 | 1118 | |
4210d50f IH |
1119 | tb_xdomain_update_link_attributes(xd); |
1120 | ||
d1ff7024 MW |
1121 | mutex_unlock(&xd->lock); |
1122 | ||
1123 | kfree(block); | |
1124 | ||
1125 | /* | |
1126 | * Now the device should be ready enough so we can add it to the | |
1127 | * bus and let userspace know about it. If the device is already | |
1128 | * registered, we notify the userspace that it has changed. | |
1129 | */ | |
1130 | if (!update) { | |
1131 | if (device_add(&xd->dev)) { | |
1132 | dev_err(&xd->dev, "failed to add XDomain device\n"); | |
1133 | return; | |
1134 | } | |
d29c59b1 MW |
1135 | dev_info(&xd->dev, "new host found, vendor=%#x device=%#x\n", |
1136 | xd->vendor, xd->device); | |
1137 | if (xd->vendor_name && xd->device_name) | |
1138 | dev_info(&xd->dev, "%s %s\n", xd->vendor_name, | |
1139 | xd->device_name); | |
d1ff7024 MW |
1140 | } else { |
1141 | kobject_uevent(&xd->dev.kobj, KOBJ_CHANGE); | |
1142 | } | |
1143 | ||
1144 | enumerate_services(xd); | |
1145 | return; | |
1146 | ||
1147 | err_free_dir: | |
1148 | tb_property_free_dir(dir); | |
1149 | err_free_block: | |
1150 | kfree(block); | |
1151 | mutex_unlock(&xd->lock); | |
1152 | } | |
1153 | ||
1154 | static void tb_xdomain_properties_changed(struct work_struct *work) | |
1155 | { | |
1156 | struct tb_xdomain *xd = container_of(work, typeof(*xd), | |
1157 | properties_changed_work.work); | |
1158 | int ret; | |
1159 | ||
d29c59b1 MW |
1160 | dev_dbg(&xd->dev, "sending properties changed notification\n"); |
1161 | ||
d1ff7024 MW |
1162 | ret = tb_xdp_properties_changed_request(xd->tb->ctl, xd->route, |
1163 | xd->properties_changed_retries, xd->local_uuid); | |
1164 | if (ret) { | |
d29c59b1 MW |
1165 | if (xd->properties_changed_retries-- > 0) { |
1166 | dev_dbg(&xd->dev, | |
1167 | "failed to send properties changed notification, retrying\n"); | |
d1ff7024 MW |
1168 | queue_delayed_work(xd->tb->wq, |
1169 | &xd->properties_changed_work, | |
1170 | msecs_to_jiffies(1000)); | |
d29c59b1 MW |
1171 | } |
1172 | dev_err(&xd->dev, "failed to send properties changed notification\n"); | |
d1ff7024 MW |
1173 | return; |
1174 | } | |
1175 | ||
1176 | xd->properties_changed_retries = XDOMAIN_PROPERTIES_CHANGED_RETRIES; | |
1177 | } | |
1178 | ||
1179 | static ssize_t device_show(struct device *dev, struct device_attribute *attr, | |
1180 | char *buf) | |
1181 | { | |
1182 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1183 | ||
1184 | return sprintf(buf, "%#x\n", xd->device); | |
1185 | } | |
1186 | static DEVICE_ATTR_RO(device); | |
1187 | ||
1188 | static ssize_t | |
1189 | device_name_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1190 | { | |
1191 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1192 | int ret; | |
1193 | ||
1194 | if (mutex_lock_interruptible(&xd->lock)) | |
1195 | return -ERESTARTSYS; | |
1196 | ret = sprintf(buf, "%s\n", xd->device_name ? xd->device_name : ""); | |
1197 | mutex_unlock(&xd->lock); | |
1198 | ||
1199 | return ret; | |
1200 | } | |
1201 | static DEVICE_ATTR_RO(device_name); | |
1202 | ||
46b494f2 MW |
1203 | static ssize_t maxhopid_show(struct device *dev, struct device_attribute *attr, |
1204 | char *buf) | |
1205 | { | |
1206 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1207 | ||
1208 | return sprintf(buf, "%d\n", xd->remote_max_hopid); | |
1209 | } | |
1210 | static DEVICE_ATTR_RO(maxhopid); | |
1211 | ||
d1ff7024 MW |
1212 | static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, |
1213 | char *buf) | |
1214 | { | |
1215 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1216 | ||
1217 | return sprintf(buf, "%#x\n", xd->vendor); | |
1218 | } | |
1219 | static DEVICE_ATTR_RO(vendor); | |
1220 | ||
1221 | static ssize_t | |
1222 | vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1223 | { | |
1224 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1225 | int ret; | |
1226 | ||
1227 | if (mutex_lock_interruptible(&xd->lock)) | |
1228 | return -ERESTARTSYS; | |
1229 | ret = sprintf(buf, "%s\n", xd->vendor_name ? xd->vendor_name : ""); | |
1230 | mutex_unlock(&xd->lock); | |
1231 | ||
1232 | return ret; | |
1233 | } | |
1234 | static DEVICE_ATTR_RO(vendor_name); | |
1235 | ||
1236 | static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr, | |
1237 | char *buf) | |
1238 | { | |
1239 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1240 | ||
1241 | return sprintf(buf, "%pUb\n", xd->remote_uuid); | |
1242 | } | |
1243 | static DEVICE_ATTR_RO(unique_id); | |
1244 | ||
4210d50f IH |
1245 | static ssize_t speed_show(struct device *dev, struct device_attribute *attr, |
1246 | char *buf) | |
1247 | { | |
1248 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1249 | ||
1250 | return sprintf(buf, "%u.0 Gb/s\n", xd->link_speed); | |
1251 | } | |
1252 | ||
1253 | static DEVICE_ATTR(rx_speed, 0444, speed_show, NULL); | |
1254 | static DEVICE_ATTR(tx_speed, 0444, speed_show, NULL); | |
1255 | ||
1256 | static ssize_t lanes_show(struct device *dev, struct device_attribute *attr, | |
1257 | char *buf) | |
1258 | { | |
1259 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1260 | ||
1261 | return sprintf(buf, "%u\n", xd->link_width); | |
1262 | } | |
1263 | ||
1264 | static DEVICE_ATTR(rx_lanes, 0444, lanes_show, NULL); | |
1265 | static DEVICE_ATTR(tx_lanes, 0444, lanes_show, NULL); | |
1266 | ||
d1ff7024 MW |
1267 | static struct attribute *xdomain_attrs[] = { |
1268 | &dev_attr_device.attr, | |
1269 | &dev_attr_device_name.attr, | |
46b494f2 | 1270 | &dev_attr_maxhopid.attr, |
4210d50f IH |
1271 | &dev_attr_rx_lanes.attr, |
1272 | &dev_attr_rx_speed.attr, | |
1273 | &dev_attr_tx_lanes.attr, | |
1274 | &dev_attr_tx_speed.attr, | |
d1ff7024 MW |
1275 | &dev_attr_unique_id.attr, |
1276 | &dev_attr_vendor.attr, | |
1277 | &dev_attr_vendor_name.attr, | |
1278 | NULL, | |
1279 | }; | |
1280 | ||
6889e00f | 1281 | static const struct attribute_group xdomain_attr_group = { |
d1ff7024 MW |
1282 | .attrs = xdomain_attrs, |
1283 | }; | |
1284 | ||
1285 | static const struct attribute_group *xdomain_attr_groups[] = { | |
1286 | &xdomain_attr_group, | |
1287 | NULL, | |
1288 | }; | |
1289 | ||
1290 | static void tb_xdomain_release(struct device *dev) | |
1291 | { | |
1292 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1293 | ||
1294 | put_device(xd->dev.parent); | |
1295 | ||
46b494f2 MW |
1296 | kfree(xd->local_property_block); |
1297 | tb_property_free_dir(xd->remote_properties); | |
180b0689 MW |
1298 | ida_destroy(&xd->out_hopids); |
1299 | ida_destroy(&xd->in_hopids); | |
d1ff7024 MW |
1300 | ida_destroy(&xd->service_ids); |
1301 | ||
1302 | kfree(xd->local_uuid); | |
1303 | kfree(xd->remote_uuid); | |
1304 | kfree(xd->device_name); | |
1305 | kfree(xd->vendor_name); | |
1306 | kfree(xd); | |
1307 | } | |
1308 | ||
1309 | static void start_handshake(struct tb_xdomain *xd) | |
1310 | { | |
3b4b3235 | 1311 | xd->uuid_retries = XDOMAIN_UUID_RETRIES; |
d1ff7024 MW |
1312 | xd->properties_retries = XDOMAIN_PROPERTIES_RETRIES; |
1313 | xd->properties_changed_retries = XDOMAIN_PROPERTIES_CHANGED_RETRIES; | |
1314 | ||
3b4b3235 MW |
1315 | if (xd->needs_uuid) { |
1316 | queue_delayed_work(xd->tb->wq, &xd->get_uuid_work, | |
1317 | msecs_to_jiffies(100)); | |
1318 | } else { | |
1319 | /* Start exchanging properties with the other host */ | |
1320 | queue_delayed_work(xd->tb->wq, &xd->properties_changed_work, | |
1321 | msecs_to_jiffies(100)); | |
1322 | queue_delayed_work(xd->tb->wq, &xd->get_properties_work, | |
1323 | msecs_to_jiffies(1000)); | |
1324 | } | |
d1ff7024 MW |
1325 | } |
1326 | ||
1327 | static void stop_handshake(struct tb_xdomain *xd) | |
1328 | { | |
3b4b3235 | 1329 | xd->uuid_retries = 0; |
d1ff7024 MW |
1330 | xd->properties_retries = 0; |
1331 | xd->properties_changed_retries = 0; | |
1332 | ||
3b4b3235 | 1333 | cancel_delayed_work_sync(&xd->get_uuid_work); |
d1ff7024 MW |
1334 | cancel_delayed_work_sync(&xd->get_properties_work); |
1335 | cancel_delayed_work_sync(&xd->properties_changed_work); | |
1336 | } | |
1337 | ||
1338 | static int __maybe_unused tb_xdomain_suspend(struct device *dev) | |
1339 | { | |
1340 | stop_handshake(tb_to_xdomain(dev)); | |
1341 | return 0; | |
1342 | } | |
1343 | ||
1344 | static int __maybe_unused tb_xdomain_resume(struct device *dev) | |
1345 | { | |
8ccbed24 | 1346 | start_handshake(tb_to_xdomain(dev)); |
d1ff7024 MW |
1347 | return 0; |
1348 | } | |
1349 | ||
1350 | static const struct dev_pm_ops tb_xdomain_pm_ops = { | |
1351 | SET_SYSTEM_SLEEP_PM_OPS(tb_xdomain_suspend, tb_xdomain_resume) | |
1352 | }; | |
1353 | ||
1354 | struct device_type tb_xdomain_type = { | |
1355 | .name = "thunderbolt_xdomain", | |
1356 | .release = tb_xdomain_release, | |
1357 | .pm = &tb_xdomain_pm_ops, | |
1358 | }; | |
1359 | EXPORT_SYMBOL_GPL(tb_xdomain_type); | |
1360 | ||
1361 | /** | |
1362 | * tb_xdomain_alloc() - Allocate new XDomain object | |
1363 | * @tb: Domain where the XDomain belongs | |
1364 | * @parent: Parent device (the switch through the connection to the | |
1365 | * other domain is reached). | |
1366 | * @route: Route string used to reach the other domain | |
1367 | * @local_uuid: Our local domain UUID | |
3b4b3235 | 1368 | * @remote_uuid: UUID of the other domain (optional) |
d1ff7024 MW |
1369 | * |
1370 | * Allocates new XDomain structure and returns pointer to that. The | |
1371 | * object must be released by calling tb_xdomain_put(). | |
1372 | */ | |
1373 | struct tb_xdomain *tb_xdomain_alloc(struct tb *tb, struct device *parent, | |
1374 | u64 route, const uuid_t *local_uuid, | |
1375 | const uuid_t *remote_uuid) | |
1376 | { | |
b0407983 | 1377 | struct tb_switch *parent_sw = tb_to_switch(parent); |
d1ff7024 | 1378 | struct tb_xdomain *xd; |
b0407983 MW |
1379 | struct tb_port *down; |
1380 | ||
1381 | /* Make sure the downstream domain is accessible */ | |
1382 | down = tb_port_at(route, parent_sw); | |
1383 | tb_port_unlock(down); | |
d1ff7024 MW |
1384 | |
1385 | xd = kzalloc(sizeof(*xd), GFP_KERNEL); | |
1386 | if (!xd) | |
1387 | return NULL; | |
1388 | ||
1389 | xd->tb = tb; | |
1390 | xd->route = route; | |
46b494f2 | 1391 | xd->local_max_hopid = down->config.max_in_hop_id; |
d1ff7024 | 1392 | ida_init(&xd->service_ids); |
180b0689 MW |
1393 | ida_init(&xd->in_hopids); |
1394 | ida_init(&xd->out_hopids); | |
d1ff7024 | 1395 | mutex_init(&xd->lock); |
3b4b3235 | 1396 | INIT_DELAYED_WORK(&xd->get_uuid_work, tb_xdomain_get_uuid); |
d1ff7024 MW |
1397 | INIT_DELAYED_WORK(&xd->get_properties_work, tb_xdomain_get_properties); |
1398 | INIT_DELAYED_WORK(&xd->properties_changed_work, | |
1399 | tb_xdomain_properties_changed); | |
1400 | ||
1401 | xd->local_uuid = kmemdup(local_uuid, sizeof(uuid_t), GFP_KERNEL); | |
1402 | if (!xd->local_uuid) | |
1403 | goto err_free; | |
1404 | ||
3b4b3235 MW |
1405 | if (remote_uuid) { |
1406 | xd->remote_uuid = kmemdup(remote_uuid, sizeof(uuid_t), | |
1407 | GFP_KERNEL); | |
1408 | if (!xd->remote_uuid) | |
1409 | goto err_free_local_uuid; | |
1410 | } else { | |
1411 | xd->needs_uuid = true; | |
1412 | } | |
d1ff7024 MW |
1413 | |
1414 | device_initialize(&xd->dev); | |
1415 | xd->dev.parent = get_device(parent); | |
1416 | xd->dev.bus = &tb_bus_type; | |
1417 | xd->dev.type = &tb_xdomain_type; | |
1418 | xd->dev.groups = xdomain_attr_groups; | |
1419 | dev_set_name(&xd->dev, "%u-%llx", tb->index, route); | |
1420 | ||
d29c59b1 MW |
1421 | dev_dbg(&xd->dev, "local UUID %pUb\n", local_uuid); |
1422 | if (remote_uuid) | |
1423 | dev_dbg(&xd->dev, "remote UUID %pUb\n", remote_uuid); | |
1424 | ||
2d8ff0b5 MW |
1425 | /* |
1426 | * This keeps the DMA powered on as long as we have active | |
1427 | * connection to another host. | |
1428 | */ | |
1429 | pm_runtime_set_active(&xd->dev); | |
1430 | pm_runtime_get_noresume(&xd->dev); | |
1431 | pm_runtime_enable(&xd->dev); | |
1432 | ||
d1ff7024 MW |
1433 | return xd; |
1434 | ||
1435 | err_free_local_uuid: | |
1436 | kfree(xd->local_uuid); | |
1437 | err_free: | |
1438 | kfree(xd); | |
1439 | ||
1440 | return NULL; | |
1441 | } | |
1442 | ||
1443 | /** | |
1444 | * tb_xdomain_add() - Add XDomain to the bus | |
1445 | * @xd: XDomain to add | |
1446 | * | |
1447 | * This function starts XDomain discovery protocol handshake and | |
1448 | * eventually adds the XDomain to the bus. After calling this function | |
1449 | * the caller needs to call tb_xdomain_remove() in order to remove and | |
1450 | * release the object regardless whether the handshake succeeded or not. | |
1451 | */ | |
1452 | void tb_xdomain_add(struct tb_xdomain *xd) | |
1453 | { | |
1454 | /* Start exchanging properties with the other host */ | |
1455 | start_handshake(xd); | |
1456 | } | |
1457 | ||
1458 | static int unregister_service(struct device *dev, void *data) | |
1459 | { | |
1460 | device_unregister(dev); | |
1461 | return 0; | |
1462 | } | |
1463 | ||
1464 | /** | |
1465 | * tb_xdomain_remove() - Remove XDomain from the bus | |
1466 | * @xd: XDomain to remove | |
1467 | * | |
1468 | * This will stop all ongoing configuration work and remove the XDomain | |
1469 | * along with any services from the bus. When the last reference to @xd | |
1470 | * is released the object will be released as well. | |
1471 | */ | |
1472 | void tb_xdomain_remove(struct tb_xdomain *xd) | |
1473 | { | |
1474 | stop_handshake(xd); | |
1475 | ||
1476 | device_for_each_child_reverse(&xd->dev, xd, unregister_service); | |
1477 | ||
2d8ff0b5 MW |
1478 | /* |
1479 | * Undo runtime PM here explicitly because it is possible that | |
1480 | * the XDomain was never added to the bus and thus device_del() | |
1481 | * is not called for it (device_del() would handle this otherwise). | |
1482 | */ | |
1483 | pm_runtime_disable(&xd->dev); | |
1484 | pm_runtime_put_noidle(&xd->dev); | |
1485 | pm_runtime_set_suspended(&xd->dev); | |
1486 | ||
d29c59b1 | 1487 | if (!device_is_registered(&xd->dev)) { |
d1ff7024 | 1488 | put_device(&xd->dev); |
d29c59b1 MW |
1489 | } else { |
1490 | dev_info(&xd->dev, "host disconnected\n"); | |
d1ff7024 | 1491 | device_unregister(&xd->dev); |
d29c59b1 | 1492 | } |
d1ff7024 MW |
1493 | } |
1494 | ||
5cc0df9c IH |
1495 | /** |
1496 | * tb_xdomain_lane_bonding_enable() - Enable lane bonding on XDomain | |
1497 | * @xd: XDomain connection | |
1498 | * | |
1499 | * Lane bonding is disabled by default for XDomains. This function tries | |
1500 | * to enable bonding by first enabling the port and waiting for the CL0 | |
1501 | * state. | |
1502 | * | |
1503 | * Return: %0 in case of success and negative errno in case of error. | |
1504 | */ | |
1505 | int tb_xdomain_lane_bonding_enable(struct tb_xdomain *xd) | |
1506 | { | |
1507 | struct tb_port *port; | |
1508 | int ret; | |
1509 | ||
1510 | port = tb_port_at(xd->route, tb_xdomain_parent(xd)); | |
1511 | if (!port->dual_link_port) | |
1512 | return -ENODEV; | |
1513 | ||
1514 | ret = tb_port_enable(port->dual_link_port); | |
1515 | if (ret) | |
1516 | return ret; | |
1517 | ||
1518 | ret = tb_wait_for_port(port->dual_link_port, true); | |
1519 | if (ret < 0) | |
1520 | return ret; | |
1521 | if (!ret) | |
1522 | return -ENOTCONN; | |
1523 | ||
1524 | ret = tb_port_lane_bonding_enable(port); | |
1525 | if (ret) { | |
1526 | tb_port_warn(port, "failed to enable lane bonding\n"); | |
1527 | return ret; | |
1528 | } | |
1529 | ||
e7051bea MW |
1530 | ret = tb_port_wait_for_link_width(port, 2, 100); |
1531 | if (ret) { | |
1532 | tb_port_warn(port, "timeout enabling lane bonding\n"); | |
1533 | return ret; | |
1534 | } | |
1535 | ||
69fea377 | 1536 | tb_port_update_credits(port); |
5cc0df9c IH |
1537 | tb_xdomain_update_link_attributes(xd); |
1538 | ||
1539 | dev_dbg(&xd->dev, "lane bonding enabled\n"); | |
1540 | return 0; | |
1541 | } | |
1542 | EXPORT_SYMBOL_GPL(tb_xdomain_lane_bonding_enable); | |
1543 | ||
1544 | /** | |
1545 | * tb_xdomain_lane_bonding_disable() - Disable lane bonding | |
1546 | * @xd: XDomain connection | |
1547 | * | |
1548 | * Lane bonding is disabled by default for XDomains. If bonding has been | |
1549 | * enabled, this function can be used to disable it. | |
1550 | */ | |
1551 | void tb_xdomain_lane_bonding_disable(struct tb_xdomain *xd) | |
1552 | { | |
1553 | struct tb_port *port; | |
1554 | ||
1555 | port = tb_port_at(xd->route, tb_xdomain_parent(xd)); | |
1556 | if (port->dual_link_port) { | |
1557 | tb_port_lane_bonding_disable(port); | |
e7051bea MW |
1558 | if (tb_port_wait_for_link_width(port, 1, 100) == -ETIMEDOUT) |
1559 | tb_port_warn(port, "timeout disabling lane bonding\n"); | |
5cc0df9c | 1560 | tb_port_disable(port->dual_link_port); |
69fea377 | 1561 | tb_port_update_credits(port); |
5cc0df9c IH |
1562 | tb_xdomain_update_link_attributes(xd); |
1563 | ||
1564 | dev_dbg(&xd->dev, "lane bonding disabled\n"); | |
1565 | } | |
1566 | } | |
1567 | EXPORT_SYMBOL_GPL(tb_xdomain_lane_bonding_disable); | |
1568 | ||
d1ff7024 | 1569 | /** |
180b0689 | 1570 | * tb_xdomain_alloc_in_hopid() - Allocate input HopID for tunneling |
d1ff7024 | 1571 | * @xd: XDomain connection |
180b0689 | 1572 | * @hopid: Preferred HopID or %-1 for next available |
d1ff7024 | 1573 | * |
180b0689 MW |
1574 | * Returns allocated HopID or negative errno. Specifically returns |
1575 | * %-ENOSPC if there are no more available HopIDs. Returned HopID is | |
1576 | * guaranteed to be within range supported by the input lane adapter. | |
1577 | * Call tb_xdomain_release_in_hopid() to release the allocated HopID. | |
d1ff7024 | 1578 | */ |
180b0689 | 1579 | int tb_xdomain_alloc_in_hopid(struct tb_xdomain *xd, int hopid) |
d1ff7024 | 1580 | { |
180b0689 MW |
1581 | if (hopid < 0) |
1582 | hopid = TB_PATH_MIN_HOPID; | |
1583 | if (hopid < TB_PATH_MIN_HOPID || hopid > xd->local_max_hopid) | |
1584 | return -EINVAL; | |
d1ff7024 | 1585 | |
180b0689 MW |
1586 | return ida_alloc_range(&xd->in_hopids, hopid, xd->local_max_hopid, |
1587 | GFP_KERNEL); | |
1588 | } | |
1589 | EXPORT_SYMBOL_GPL(tb_xdomain_alloc_in_hopid); | |
d1ff7024 | 1590 | |
180b0689 MW |
1591 | /** |
1592 | * tb_xdomain_alloc_out_hopid() - Allocate output HopID for tunneling | |
1593 | * @xd: XDomain connection | |
1594 | * @hopid: Preferred HopID or %-1 for next available | |
1595 | * | |
1596 | * Returns allocated HopID or negative errno. Specifically returns | |
1597 | * %-ENOSPC if there are no more available HopIDs. Returned HopID is | |
1598 | * guaranteed to be within range supported by the output lane adapter. | |
1599 | * Call tb_xdomain_release_in_hopid() to release the allocated HopID. | |
1600 | */ | |
1601 | int tb_xdomain_alloc_out_hopid(struct tb_xdomain *xd, int hopid) | |
1602 | { | |
1603 | if (hopid < 0) | |
1604 | hopid = TB_PATH_MIN_HOPID; | |
1605 | if (hopid < TB_PATH_MIN_HOPID || hopid > xd->remote_max_hopid) | |
1606 | return -EINVAL; | |
d1ff7024 | 1607 | |
180b0689 MW |
1608 | return ida_alloc_range(&xd->out_hopids, hopid, xd->remote_max_hopid, |
1609 | GFP_KERNEL); | |
1610 | } | |
1611 | EXPORT_SYMBOL_GPL(tb_xdomain_alloc_out_hopid); | |
d1ff7024 | 1612 | |
180b0689 MW |
1613 | /** |
1614 | * tb_xdomain_release_in_hopid() - Release input HopID | |
1615 | * @xd: XDomain connection | |
1616 | * @hopid: HopID to release | |
1617 | */ | |
1618 | void tb_xdomain_release_in_hopid(struct tb_xdomain *xd, int hopid) | |
1619 | { | |
1620 | ida_free(&xd->in_hopids, hopid); | |
1621 | } | |
1622 | EXPORT_SYMBOL_GPL(tb_xdomain_release_in_hopid); | |
d1ff7024 | 1623 | |
180b0689 MW |
1624 | /** |
1625 | * tb_xdomain_release_out_hopid() - Release output HopID | |
1626 | * @xd: XDomain connection | |
1627 | * @hopid: HopID to release | |
1628 | */ | |
1629 | void tb_xdomain_release_out_hopid(struct tb_xdomain *xd, int hopid) | |
1630 | { | |
1631 | ida_free(&xd->out_hopids, hopid); | |
1632 | } | |
1633 | EXPORT_SYMBOL_GPL(tb_xdomain_release_out_hopid); | |
d1ff7024 | 1634 | |
180b0689 MW |
1635 | /** |
1636 | * tb_xdomain_enable_paths() - Enable DMA paths for XDomain connection | |
1637 | * @xd: XDomain connection | |
1638 | * @transmit_path: HopID we are using to send out packets | |
1639 | * @transmit_ring: DMA ring used to send out packets | |
1640 | * @receive_path: HopID the other end is using to send packets to us | |
1641 | * @receive_ring: DMA ring used to receive packets from @receive_path | |
1642 | * | |
1643 | * The function enables DMA paths accordingly so that after successful | |
1644 | * return the caller can send and receive packets using high-speed DMA | |
1645 | * path. If a transmit or receive path is not needed, pass %-1 for those | |
1646 | * parameters. | |
1647 | * | |
1648 | * Return: %0 in case of success and negative errno in case of error | |
1649 | */ | |
1650 | int tb_xdomain_enable_paths(struct tb_xdomain *xd, int transmit_path, | |
1651 | int transmit_ring, int receive_path, | |
1652 | int receive_ring) | |
1653 | { | |
1654 | return tb_domain_approve_xdomain_paths(xd->tb, xd, transmit_path, | |
1655 | transmit_ring, receive_path, | |
1656 | receive_ring); | |
d1ff7024 MW |
1657 | } |
1658 | EXPORT_SYMBOL_GPL(tb_xdomain_enable_paths); | |
1659 | ||
1660 | /** | |
1661 | * tb_xdomain_disable_paths() - Disable DMA paths for XDomain connection | |
1662 | * @xd: XDomain connection | |
180b0689 MW |
1663 | * @transmit_path: HopID we are using to send out packets |
1664 | * @transmit_ring: DMA ring used to send out packets | |
1665 | * @receive_path: HopID the other end is using to send packets to us | |
1666 | * @receive_ring: DMA ring used to receive packets from @receive_path | |
d1ff7024 MW |
1667 | * |
1668 | * This does the opposite of tb_xdomain_enable_paths(). After call to | |
180b0689 MW |
1669 | * this the caller is not expected to use the rings anymore. Passing %-1 |
1670 | * as path/ring parameter means don't care. Normally the callers should | |
1671 | * pass the same values here as they do when paths are enabled. | |
d1ff7024 MW |
1672 | * |
1673 | * Return: %0 in case of success and negative errno in case of error | |
1674 | */ | |
180b0689 MW |
1675 | int tb_xdomain_disable_paths(struct tb_xdomain *xd, int transmit_path, |
1676 | int transmit_ring, int receive_path, | |
1677 | int receive_ring) | |
d1ff7024 | 1678 | { |
180b0689 MW |
1679 | return tb_domain_disconnect_xdomain_paths(xd->tb, xd, transmit_path, |
1680 | transmit_ring, receive_path, | |
1681 | receive_ring); | |
d1ff7024 MW |
1682 | } |
1683 | EXPORT_SYMBOL_GPL(tb_xdomain_disable_paths); | |
1684 | ||
1685 | struct tb_xdomain_lookup { | |
1686 | const uuid_t *uuid; | |
1687 | u8 link; | |
1688 | u8 depth; | |
484cb153 | 1689 | u64 route; |
d1ff7024 MW |
1690 | }; |
1691 | ||
1692 | static struct tb_xdomain *switch_find_xdomain(struct tb_switch *sw, | |
1693 | const struct tb_xdomain_lookup *lookup) | |
1694 | { | |
b433d010 | 1695 | struct tb_port *port; |
d1ff7024 | 1696 | |
b433d010 | 1697 | tb_switch_for_each_port(sw, port) { |
d1ff7024 MW |
1698 | struct tb_xdomain *xd; |
1699 | ||
d1ff7024 MW |
1700 | if (port->xdomain) { |
1701 | xd = port->xdomain; | |
1702 | ||
1703 | if (lookup->uuid) { | |
3b4b3235 MW |
1704 | if (xd->remote_uuid && |
1705 | uuid_equal(xd->remote_uuid, lookup->uuid)) | |
d1ff7024 | 1706 | return xd; |
484cb153 RM |
1707 | } else if (lookup->link && |
1708 | lookup->link == xd->link && | |
d1ff7024 MW |
1709 | lookup->depth == xd->depth) { |
1710 | return xd; | |
484cb153 RM |
1711 | } else if (lookup->route && |
1712 | lookup->route == xd->route) { | |
1713 | return xd; | |
d1ff7024 | 1714 | } |
dfe40ca4 | 1715 | } else if (tb_port_has_remote(port)) { |
d1ff7024 MW |
1716 | xd = switch_find_xdomain(port->remote->sw, lookup); |
1717 | if (xd) | |
1718 | return xd; | |
1719 | } | |
1720 | } | |
1721 | ||
1722 | return NULL; | |
1723 | } | |
1724 | ||
1725 | /** | |
1726 | * tb_xdomain_find_by_uuid() - Find an XDomain by UUID | |
1727 | * @tb: Domain where the XDomain belongs to | |
1728 | * @uuid: UUID to look for | |
1729 | * | |
1730 | * Finds XDomain by walking through the Thunderbolt topology below @tb. | |
1731 | * The returned XDomain will have its reference count increased so the | |
1732 | * caller needs to call tb_xdomain_put() when it is done with the | |
1733 | * object. | |
1734 | * | |
1735 | * This will find all XDomains including the ones that are not yet added | |
1736 | * to the bus (handshake is still in progress). | |
1737 | * | |
1738 | * The caller needs to hold @tb->lock. | |
1739 | */ | |
1740 | struct tb_xdomain *tb_xdomain_find_by_uuid(struct tb *tb, const uuid_t *uuid) | |
1741 | { | |
1742 | struct tb_xdomain_lookup lookup; | |
1743 | struct tb_xdomain *xd; | |
1744 | ||
1745 | memset(&lookup, 0, sizeof(lookup)); | |
1746 | lookup.uuid = uuid; | |
1747 | ||
1748 | xd = switch_find_xdomain(tb->root_switch, &lookup); | |
484cb153 | 1749 | return tb_xdomain_get(xd); |
d1ff7024 MW |
1750 | } |
1751 | EXPORT_SYMBOL_GPL(tb_xdomain_find_by_uuid); | |
1752 | ||
1753 | /** | |
1754 | * tb_xdomain_find_by_link_depth() - Find an XDomain by link and depth | |
1755 | * @tb: Domain where the XDomain belongs to | |
1756 | * @link: Root switch link number | |
1757 | * @depth: Depth in the link | |
1758 | * | |
1759 | * Finds XDomain by walking through the Thunderbolt topology below @tb. | |
1760 | * The returned XDomain will have its reference count increased so the | |
1761 | * caller needs to call tb_xdomain_put() when it is done with the | |
1762 | * object. | |
1763 | * | |
1764 | * This will find all XDomains including the ones that are not yet added | |
1765 | * to the bus (handshake is still in progress). | |
1766 | * | |
1767 | * The caller needs to hold @tb->lock. | |
1768 | */ | |
1769 | struct tb_xdomain *tb_xdomain_find_by_link_depth(struct tb *tb, u8 link, | |
1770 | u8 depth) | |
1771 | { | |
1772 | struct tb_xdomain_lookup lookup; | |
1773 | struct tb_xdomain *xd; | |
1774 | ||
1775 | memset(&lookup, 0, sizeof(lookup)); | |
1776 | lookup.link = link; | |
1777 | lookup.depth = depth; | |
1778 | ||
1779 | xd = switch_find_xdomain(tb->root_switch, &lookup); | |
484cb153 RM |
1780 | return tb_xdomain_get(xd); |
1781 | } | |
d1ff7024 | 1782 | |
484cb153 RM |
1783 | /** |
1784 | * tb_xdomain_find_by_route() - Find an XDomain by route string | |
1785 | * @tb: Domain where the XDomain belongs to | |
1786 | * @route: XDomain route string | |
1787 | * | |
1788 | * Finds XDomain by walking through the Thunderbolt topology below @tb. | |
1789 | * The returned XDomain will have its reference count increased so the | |
1790 | * caller needs to call tb_xdomain_put() when it is done with the | |
1791 | * object. | |
1792 | * | |
1793 | * This will find all XDomains including the ones that are not yet added | |
1794 | * to the bus (handshake is still in progress). | |
1795 | * | |
1796 | * The caller needs to hold @tb->lock. | |
1797 | */ | |
1798 | struct tb_xdomain *tb_xdomain_find_by_route(struct tb *tb, u64 route) | |
1799 | { | |
1800 | struct tb_xdomain_lookup lookup; | |
1801 | struct tb_xdomain *xd; | |
1802 | ||
1803 | memset(&lookup, 0, sizeof(lookup)); | |
1804 | lookup.route = route; | |
1805 | ||
1806 | xd = switch_find_xdomain(tb->root_switch, &lookup); | |
1807 | return tb_xdomain_get(xd); | |
d1ff7024 | 1808 | } |
484cb153 | 1809 | EXPORT_SYMBOL_GPL(tb_xdomain_find_by_route); |
d1ff7024 MW |
1810 | |
1811 | bool tb_xdomain_handle_request(struct tb *tb, enum tb_cfg_pkg_type type, | |
1812 | const void *buf, size_t size) | |
1813 | { | |
1814 | const struct tb_protocol_handler *handler, *tmp; | |
1815 | const struct tb_xdp_header *hdr = buf; | |
1816 | unsigned int length; | |
1817 | int ret = 0; | |
1818 | ||
1819 | /* We expect the packet is at least size of the header */ | |
1820 | length = hdr->xd_hdr.length_sn & TB_XDOMAIN_LENGTH_MASK; | |
1821 | if (length != size / 4 - sizeof(hdr->xd_hdr) / 4) | |
1822 | return true; | |
1823 | if (length < sizeof(*hdr) / 4 - sizeof(hdr->xd_hdr) / 4) | |
1824 | return true; | |
1825 | ||
1826 | /* | |
1827 | * Handle XDomain discovery protocol packets directly here. For | |
1828 | * other protocols (based on their UUID) we call registered | |
1829 | * handlers in turn. | |
1830 | */ | |
1831 | if (uuid_equal(&hdr->uuid, &tb_xdp_uuid)) { | |
48f40b96 AP |
1832 | if (type == TB_CFG_PKG_XDOMAIN_REQ) |
1833 | return tb_xdp_schedule_request(tb, hdr, size); | |
d1ff7024 MW |
1834 | return false; |
1835 | } | |
1836 | ||
1837 | mutex_lock(&xdomain_lock); | |
1838 | list_for_each_entry_safe(handler, tmp, &protocol_handlers, list) { | |
1839 | if (!uuid_equal(&hdr->uuid, handler->uuid)) | |
1840 | continue; | |
1841 | ||
1842 | mutex_unlock(&xdomain_lock); | |
1843 | ret = handler->callback(buf, size, handler->data); | |
1844 | mutex_lock(&xdomain_lock); | |
1845 | ||
1846 | if (ret) | |
1847 | break; | |
1848 | } | |
1849 | mutex_unlock(&xdomain_lock); | |
1850 | ||
1851 | return ret > 0; | |
1852 | } | |
1853 | ||
d1ff7024 MW |
1854 | static int update_xdomain(struct device *dev, void *data) |
1855 | { | |
1856 | struct tb_xdomain *xd; | |
1857 | ||
1858 | xd = tb_to_xdomain(dev); | |
1859 | if (xd) { | |
1860 | queue_delayed_work(xd->tb->wq, &xd->properties_changed_work, | |
1861 | msecs_to_jiffies(50)); | |
1862 | } | |
1863 | ||
1864 | return 0; | |
1865 | } | |
1866 | ||
1867 | static void update_all_xdomains(void) | |
1868 | { | |
1869 | bus_for_each_dev(&tb_bus_type, NULL, NULL, update_xdomain); | |
1870 | } | |
1871 | ||
1872 | static bool remove_directory(const char *key, const struct tb_property_dir *dir) | |
1873 | { | |
1874 | struct tb_property *p; | |
1875 | ||
1876 | p = tb_property_find(xdomain_property_dir, key, | |
1877 | TB_PROPERTY_TYPE_DIRECTORY); | |
1878 | if (p && p->value.dir == dir) { | |
1879 | tb_property_remove(p); | |
1880 | return true; | |
1881 | } | |
1882 | return false; | |
1883 | } | |
1884 | ||
1885 | /** | |
1886 | * tb_register_property_dir() - Register property directory to the host | |
1887 | * @key: Key (name) of the directory to add | |
1888 | * @dir: Directory to add | |
1889 | * | |
1890 | * Service drivers can use this function to add new property directory | |
1891 | * to the host available properties. The other connected hosts are | |
1892 | * notified so they can re-read properties of this host if they are | |
1893 | * interested. | |
1894 | * | |
1895 | * Return: %0 on success and negative errno on failure | |
1896 | */ | |
1897 | int tb_register_property_dir(const char *key, struct tb_property_dir *dir) | |
1898 | { | |
1899 | int ret; | |
1900 | ||
acb40d84 MW |
1901 | if (WARN_ON(!xdomain_property_dir)) |
1902 | return -EAGAIN; | |
1903 | ||
d1ff7024 MW |
1904 | if (!key || strlen(key) > 8) |
1905 | return -EINVAL; | |
1906 | ||
1907 | mutex_lock(&xdomain_lock); | |
1908 | if (tb_property_find(xdomain_property_dir, key, | |
1909 | TB_PROPERTY_TYPE_DIRECTORY)) { | |
1910 | ret = -EEXIST; | |
1911 | goto err_unlock; | |
1912 | } | |
1913 | ||
1914 | ret = tb_property_add_dir(xdomain_property_dir, key, dir); | |
1915 | if (ret) | |
1916 | goto err_unlock; | |
1917 | ||
46b494f2 | 1918 | xdomain_property_block_gen++; |
d1ff7024 MW |
1919 | |
1920 | mutex_unlock(&xdomain_lock); | |
1921 | update_all_xdomains(); | |
1922 | return 0; | |
1923 | ||
1924 | err_unlock: | |
1925 | mutex_unlock(&xdomain_lock); | |
1926 | return ret; | |
1927 | } | |
1928 | EXPORT_SYMBOL_GPL(tb_register_property_dir); | |
1929 | ||
1930 | /** | |
1931 | * tb_unregister_property_dir() - Removes property directory from host | |
1932 | * @key: Key (name) of the directory | |
1933 | * @dir: Directory to remove | |
1934 | * | |
1935 | * This will remove the existing directory from this host and notify the | |
1936 | * connected hosts about the change. | |
1937 | */ | |
1938 | void tb_unregister_property_dir(const char *key, struct tb_property_dir *dir) | |
1939 | { | |
1940 | int ret = 0; | |
1941 | ||
1942 | mutex_lock(&xdomain_lock); | |
1943 | if (remove_directory(key, dir)) | |
46b494f2 | 1944 | xdomain_property_block_gen++; |
d1ff7024 MW |
1945 | mutex_unlock(&xdomain_lock); |
1946 | ||
1947 | if (!ret) | |
1948 | update_all_xdomains(); | |
1949 | } | |
1950 | EXPORT_SYMBOL_GPL(tb_unregister_property_dir); | |
1951 | ||
1952 | int tb_xdomain_init(void) | |
1953 | { | |
d1ff7024 MW |
1954 | xdomain_property_dir = tb_property_create_dir(NULL); |
1955 | if (!xdomain_property_dir) | |
1956 | return -ENOMEM; | |
1957 | ||
1958 | /* | |
1959 | * Initialize standard set of properties without any service | |
1960 | * directories. Those will be added by service drivers | |
1961 | * themselves when they are loaded. | |
8a00c67e | 1962 | * |
46b494f2 MW |
1963 | * Rest of the properties are filled dynamically based on these |
1964 | * when the P2P connection is made. | |
d1ff7024 MW |
1965 | */ |
1966 | tb_property_add_immediate(xdomain_property_dir, "vendorid", | |
1967 | PCI_VENDOR_ID_INTEL); | |
1968 | tb_property_add_text(xdomain_property_dir, "vendorid", "Intel Corp."); | |
1969 | tb_property_add_immediate(xdomain_property_dir, "deviceid", 0x1); | |
d1ff7024 MW |
1970 | tb_property_add_immediate(xdomain_property_dir, "devicerv", 0x80000100); |
1971 | ||
a6932c3f | 1972 | xdomain_property_block_gen = prandom_u32(); |
8a00c67e | 1973 | return 0; |
d1ff7024 MW |
1974 | } |
1975 | ||
1976 | void tb_xdomain_exit(void) | |
1977 | { | |
d1ff7024 MW |
1978 | tb_property_free_dir(xdomain_property_dir); |
1979 | } |