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 | ||
8e1de704 MW |
22 | #define XDOMAIN_SHORT_TIMEOUT 100 /* ms */ |
23 | #define XDOMAIN_DEFAULT_TIMEOUT 1000 /* ms */ | |
24 | #define XDOMAIN_BONDING_TIMEOUT 10000 /* ms */ | |
25 | #define XDOMAIN_RETRIES 10 | |
46b494f2 | 26 | #define XDOMAIN_DEFAULT_MAX_HOPID 15 |
d1ff7024 | 27 | |
8e1de704 MW |
28 | enum { |
29 | XDOMAIN_STATE_INIT, | |
30 | XDOMAIN_STATE_UUID, | |
31 | XDOMAIN_STATE_LINK_STATUS, | |
32 | XDOMAIN_STATE_LINK_STATE_CHANGE, | |
33 | XDOMAIN_STATE_LINK_STATUS2, | |
34 | XDOMAIN_STATE_BONDING_UUID_LOW, | |
35 | XDOMAIN_STATE_BONDING_UUID_HIGH, | |
36 | XDOMAIN_STATE_PROPERTIES, | |
37 | XDOMAIN_STATE_ENUMERATED, | |
38 | XDOMAIN_STATE_ERROR, | |
39 | }; | |
40 | ||
41 | static const char * const state_names[] = { | |
42 | [XDOMAIN_STATE_INIT] = "INIT", | |
43 | [XDOMAIN_STATE_UUID] = "UUID", | |
44 | [XDOMAIN_STATE_LINK_STATUS] = "LINK_STATUS", | |
45 | [XDOMAIN_STATE_LINK_STATE_CHANGE] = "LINK_STATE_CHANGE", | |
46 | [XDOMAIN_STATE_LINK_STATUS2] = "LINK_STATUS2", | |
47 | [XDOMAIN_STATE_BONDING_UUID_LOW] = "BONDING_UUID_LOW", | |
48 | [XDOMAIN_STATE_BONDING_UUID_HIGH] = "BONDING_UUID_HIGH", | |
49 | [XDOMAIN_STATE_PROPERTIES] = "PROPERTIES", | |
50 | [XDOMAIN_STATE_ENUMERATED] = "ENUMERATED", | |
51 | [XDOMAIN_STATE_ERROR] = "ERROR", | |
52 | }; | |
53 | ||
d1ff7024 MW |
54 | struct xdomain_request_work { |
55 | struct work_struct work; | |
56 | struct tb_xdp_header *pkg; | |
57 | struct tb *tb; | |
58 | }; | |
59 | ||
5ca67688 MW |
60 | static bool tb_xdomain_enabled = true; |
61 | module_param_named(xdomain, tb_xdomain_enabled, bool, 0444); | |
62 | MODULE_PARM_DESC(xdomain, "allow XDomain protocol (default: true)"); | |
63 | ||
46b494f2 MW |
64 | /* |
65 | * Serializes access to the properties and protocol handlers below. If | |
66 | * you need to take both this lock and the struct tb_xdomain lock, take | |
67 | * this one first. | |
68 | */ | |
d1ff7024 MW |
69 | static DEFINE_MUTEX(xdomain_lock); |
70 | ||
71 | /* Properties exposed to the remote domains */ | |
72 | static struct tb_property_dir *xdomain_property_dir; | |
d1ff7024 MW |
73 | static u32 xdomain_property_block_gen; |
74 | ||
75 | /* Additional protocol handlers */ | |
76 | static LIST_HEAD(protocol_handlers); | |
77 | ||
78 | /* UUID for XDomain discovery protocol: b638d70e-42ff-40bb-97c2-90e2c0b2ff07 */ | |
79 | static const uuid_t tb_xdp_uuid = | |
80 | UUID_INIT(0xb638d70e, 0x42ff, 0x40bb, | |
81 | 0x97, 0xc2, 0x90, 0xe2, 0xc0, 0xb2, 0xff, 0x07); | |
82 | ||
5ca67688 MW |
83 | bool tb_is_xdomain_enabled(void) |
84 | { | |
c6da62a2 | 85 | return tb_xdomain_enabled && tb_acpi_is_xdomain_allowed(); |
5ca67688 MW |
86 | } |
87 | ||
d1ff7024 MW |
88 | static bool tb_xdomain_match(const struct tb_cfg_request *req, |
89 | const struct ctl_pkg *pkg) | |
90 | { | |
91 | switch (pkg->frame.eof) { | |
92 | case TB_CFG_PKG_ERROR: | |
93 | return true; | |
94 | ||
95 | case TB_CFG_PKG_XDOMAIN_RESP: { | |
96 | const struct tb_xdp_header *res_hdr = pkg->buffer; | |
97 | const struct tb_xdp_header *req_hdr = req->request; | |
d1ff7024 MW |
98 | |
99 | if (pkg->frame.size < req->response_size / 4) | |
100 | return false; | |
101 | ||
102 | /* Make sure route matches */ | |
103 | if ((res_hdr->xd_hdr.route_hi & ~BIT(31)) != | |
104 | req_hdr->xd_hdr.route_hi) | |
105 | return false; | |
106 | if ((res_hdr->xd_hdr.route_lo) != req_hdr->xd_hdr.route_lo) | |
107 | return false; | |
108 | ||
d1ff7024 MW |
109 | /* Check that the XDomain protocol matches */ |
110 | if (!uuid_equal(&res_hdr->uuid, &req_hdr->uuid)) | |
111 | return false; | |
112 | ||
113 | return true; | |
114 | } | |
115 | ||
116 | default: | |
117 | return false; | |
118 | } | |
119 | } | |
120 | ||
121 | static bool tb_xdomain_copy(struct tb_cfg_request *req, | |
122 | const struct ctl_pkg *pkg) | |
123 | { | |
124 | memcpy(req->response, pkg->buffer, req->response_size); | |
125 | req->result.err = 0; | |
126 | return true; | |
127 | } | |
128 | ||
129 | static void response_ready(void *data) | |
130 | { | |
131 | tb_cfg_request_put(data); | |
132 | } | |
133 | ||
134 | static int __tb_xdomain_response(struct tb_ctl *ctl, const void *response, | |
135 | size_t size, enum tb_cfg_pkg_type type) | |
136 | { | |
137 | struct tb_cfg_request *req; | |
138 | ||
139 | req = tb_cfg_request_alloc(); | |
140 | if (!req) | |
141 | return -ENOMEM; | |
142 | ||
143 | req->match = tb_xdomain_match; | |
144 | req->copy = tb_xdomain_copy; | |
145 | req->request = response; | |
146 | req->request_size = size; | |
147 | req->request_type = type; | |
148 | ||
149 | return tb_cfg_request(ctl, req, response_ready, req); | |
150 | } | |
151 | ||
152 | /** | |
153 | * tb_xdomain_response() - Send a XDomain response message | |
154 | * @xd: XDomain to send the message | |
155 | * @response: Response to send | |
156 | * @size: Size of the response | |
157 | * @type: PDF type of the response | |
158 | * | |
159 | * This can be used to send a XDomain response message to the other | |
160 | * domain. No response for the message is expected. | |
161 | * | |
162 | * Return: %0 in case of success and negative errno in case of failure | |
163 | */ | |
164 | int tb_xdomain_response(struct tb_xdomain *xd, const void *response, | |
165 | size_t size, enum tb_cfg_pkg_type type) | |
166 | { | |
167 | return __tb_xdomain_response(xd->tb->ctl, response, size, type); | |
168 | } | |
169 | EXPORT_SYMBOL_GPL(tb_xdomain_response); | |
170 | ||
171 | static int __tb_xdomain_request(struct tb_ctl *ctl, const void *request, | |
172 | size_t request_size, enum tb_cfg_pkg_type request_type, void *response, | |
173 | size_t response_size, enum tb_cfg_pkg_type response_type, | |
174 | unsigned int timeout_msec) | |
175 | { | |
176 | struct tb_cfg_request *req; | |
177 | struct tb_cfg_result res; | |
178 | ||
179 | req = tb_cfg_request_alloc(); | |
180 | if (!req) | |
181 | return -ENOMEM; | |
182 | ||
183 | req->match = tb_xdomain_match; | |
184 | req->copy = tb_xdomain_copy; | |
185 | req->request = request; | |
186 | req->request_size = request_size; | |
187 | req->request_type = request_type; | |
188 | req->response = response; | |
189 | req->response_size = response_size; | |
190 | req->response_type = response_type; | |
191 | ||
192 | res = tb_cfg_request_sync(ctl, req, timeout_msec); | |
193 | ||
194 | tb_cfg_request_put(req); | |
195 | ||
196 | return res.err == 1 ? -EIO : res.err; | |
197 | } | |
198 | ||
199 | /** | |
200 | * tb_xdomain_request() - Send a XDomain request | |
201 | * @xd: XDomain to send the request | |
202 | * @request: Request to send | |
203 | * @request_size: Size of the request in bytes | |
204 | * @request_type: PDF type of the request | |
205 | * @response: Response is copied here | |
206 | * @response_size: Expected size of the response in bytes | |
207 | * @response_type: Expected PDF type of the response | |
208 | * @timeout_msec: Timeout in milliseconds to wait for the response | |
209 | * | |
210 | * This function can be used to send XDomain control channel messages to | |
211 | * the other domain. The function waits until the response is received | |
212 | * or when timeout triggers. Whichever comes first. | |
213 | * | |
214 | * Return: %0 in case of success and negative errno in case of failure | |
215 | */ | |
216 | int tb_xdomain_request(struct tb_xdomain *xd, const void *request, | |
217 | size_t request_size, enum tb_cfg_pkg_type request_type, | |
218 | void *response, size_t response_size, | |
219 | enum tb_cfg_pkg_type response_type, unsigned int timeout_msec) | |
220 | { | |
221 | return __tb_xdomain_request(xd->tb->ctl, request, request_size, | |
222 | request_type, response, response_size, | |
223 | response_type, timeout_msec); | |
224 | } | |
225 | EXPORT_SYMBOL_GPL(tb_xdomain_request); | |
226 | ||
227 | static inline void tb_xdp_fill_header(struct tb_xdp_header *hdr, u64 route, | |
228 | u8 sequence, enum tb_xdp_type type, size_t size) | |
229 | { | |
230 | u32 length_sn; | |
231 | ||
232 | length_sn = (size - sizeof(hdr->xd_hdr)) / 4; | |
233 | length_sn |= (sequence << TB_XDOMAIN_SN_SHIFT) & TB_XDOMAIN_SN_MASK; | |
234 | ||
235 | hdr->xd_hdr.route_hi = upper_32_bits(route); | |
236 | hdr->xd_hdr.route_lo = lower_32_bits(route); | |
237 | hdr->xd_hdr.length_sn = length_sn; | |
238 | hdr->type = type; | |
239 | memcpy(&hdr->uuid, &tb_xdp_uuid, sizeof(tb_xdp_uuid)); | |
240 | } | |
241 | ||
19813551 | 242 | static int tb_xdp_handle_error(const struct tb_xdp_error_response *res) |
d1ff7024 | 243 | { |
19813551 | 244 | if (res->hdr.type != ERROR_RESPONSE) |
d1ff7024 MW |
245 | return 0; |
246 | ||
19813551 | 247 | switch (res->error) { |
d1ff7024 MW |
248 | case ERROR_UNKNOWN_PACKET: |
249 | case ERROR_UNKNOWN_DOMAIN: | |
250 | return -EIO; | |
251 | case ERROR_NOT_SUPPORTED: | |
252 | return -ENOTSUPP; | |
253 | case ERROR_NOT_READY: | |
254 | return -EAGAIN; | |
255 | default: | |
256 | break; | |
257 | } | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
3b4b3235 | 262 | static int tb_xdp_uuid_request(struct tb_ctl *ctl, u64 route, int retry, |
8e1de704 | 263 | uuid_t *uuid, u64 *remote_route) |
3b4b3235 MW |
264 | { |
265 | struct tb_xdp_uuid_response res; | |
266 | struct tb_xdp_uuid req; | |
267 | int ret; | |
268 | ||
269 | memset(&req, 0, sizeof(req)); | |
270 | tb_xdp_fill_header(&req.hdr, route, retry % 4, UUID_REQUEST, | |
271 | sizeof(req)); | |
272 | ||
273 | memset(&res, 0, sizeof(res)); | |
274 | ret = __tb_xdomain_request(ctl, &req, sizeof(req), | |
275 | TB_CFG_PKG_XDOMAIN_REQ, &res, sizeof(res), | |
276 | TB_CFG_PKG_XDOMAIN_RESP, | |
277 | XDOMAIN_DEFAULT_TIMEOUT); | |
278 | if (ret) | |
279 | return ret; | |
280 | ||
19813551 | 281 | ret = tb_xdp_handle_error(&res.err); |
3b4b3235 MW |
282 | if (ret) |
283 | return ret; | |
284 | ||
285 | uuid_copy(uuid, &res.src_uuid); | |
8e1de704 MW |
286 | *remote_route = (u64)res.src_route_hi << 32 | res.src_route_lo; |
287 | ||
3b4b3235 MW |
288 | return 0; |
289 | } | |
290 | ||
291 | static int tb_xdp_uuid_response(struct tb_ctl *ctl, u64 route, u8 sequence, | |
292 | const uuid_t *uuid) | |
293 | { | |
294 | struct tb_xdp_uuid_response res; | |
295 | ||
296 | memset(&res, 0, sizeof(res)); | |
297 | tb_xdp_fill_header(&res.hdr, route, sequence, UUID_RESPONSE, | |
298 | sizeof(res)); | |
299 | ||
300 | uuid_copy(&res.src_uuid, uuid); | |
301 | res.src_route_hi = upper_32_bits(route); | |
302 | res.src_route_lo = lower_32_bits(route); | |
303 | ||
304 | return __tb_xdomain_response(ctl, &res, sizeof(res), | |
305 | TB_CFG_PKG_XDOMAIN_RESP); | |
306 | } | |
307 | ||
d1ff7024 MW |
308 | static int tb_xdp_error_response(struct tb_ctl *ctl, u64 route, u8 sequence, |
309 | enum tb_xdp_error error) | |
310 | { | |
311 | struct tb_xdp_error_response res; | |
312 | ||
313 | memset(&res, 0, sizeof(res)); | |
314 | tb_xdp_fill_header(&res.hdr, route, sequence, ERROR_RESPONSE, | |
315 | sizeof(res)); | |
316 | res.error = error; | |
317 | ||
318 | return __tb_xdomain_response(ctl, &res, sizeof(res), | |
319 | TB_CFG_PKG_XDOMAIN_RESP); | |
320 | } | |
321 | ||
322 | static int tb_xdp_properties_request(struct tb_ctl *ctl, u64 route, | |
323 | const uuid_t *src_uuid, const uuid_t *dst_uuid, int retry, | |
324 | u32 **block, u32 *generation) | |
325 | { | |
326 | struct tb_xdp_properties_response *res; | |
327 | struct tb_xdp_properties req; | |
328 | u16 data_len, len; | |
329 | size_t total_size; | |
330 | u32 *data = NULL; | |
331 | int ret; | |
332 | ||
333 | total_size = sizeof(*res) + TB_XDP_PROPERTIES_MAX_DATA_LENGTH * 4; | |
334 | res = kzalloc(total_size, GFP_KERNEL); | |
335 | if (!res) | |
336 | return -ENOMEM; | |
337 | ||
338 | memset(&req, 0, sizeof(req)); | |
339 | tb_xdp_fill_header(&req.hdr, route, retry % 4, PROPERTIES_REQUEST, | |
340 | sizeof(req)); | |
341 | memcpy(&req.src_uuid, src_uuid, sizeof(*src_uuid)); | |
342 | memcpy(&req.dst_uuid, dst_uuid, sizeof(*dst_uuid)); | |
343 | ||
344 | len = 0; | |
345 | data_len = 0; | |
346 | ||
347 | do { | |
348 | ret = __tb_xdomain_request(ctl, &req, sizeof(req), | |
349 | TB_CFG_PKG_XDOMAIN_REQ, res, | |
350 | total_size, TB_CFG_PKG_XDOMAIN_RESP, | |
351 | XDOMAIN_DEFAULT_TIMEOUT); | |
352 | if (ret) | |
353 | goto err; | |
354 | ||
19813551 | 355 | ret = tb_xdp_handle_error(&res->err); |
d1ff7024 MW |
356 | if (ret) |
357 | goto err; | |
358 | ||
359 | /* | |
360 | * Package length includes the whole payload without the | |
361 | * XDomain header. Validate first that the package is at | |
362 | * least size of the response structure. | |
363 | */ | |
364 | len = res->hdr.xd_hdr.length_sn & TB_XDOMAIN_LENGTH_MASK; | |
365 | if (len < sizeof(*res) / 4) { | |
366 | ret = -EINVAL; | |
367 | goto err; | |
368 | } | |
369 | ||
370 | len += sizeof(res->hdr.xd_hdr) / 4; | |
371 | len -= sizeof(*res) / 4; | |
372 | ||
373 | if (res->offset != req.offset) { | |
374 | ret = -EINVAL; | |
375 | goto err; | |
376 | } | |
377 | ||
378 | /* | |
379 | * First time allocate block that has enough space for | |
380 | * the whole properties block. | |
381 | */ | |
382 | if (!data) { | |
383 | data_len = res->data_length; | |
384 | if (data_len > TB_XDP_PROPERTIES_MAX_LENGTH) { | |
385 | ret = -E2BIG; | |
386 | goto err; | |
387 | } | |
388 | ||
389 | data = kcalloc(data_len, sizeof(u32), GFP_KERNEL); | |
390 | if (!data) { | |
391 | ret = -ENOMEM; | |
392 | goto err; | |
393 | } | |
394 | } | |
395 | ||
396 | memcpy(data + req.offset, res->data, len * 4); | |
397 | req.offset += len; | |
398 | } while (!data_len || req.offset < data_len); | |
399 | ||
400 | *block = data; | |
401 | *generation = res->generation; | |
402 | ||
403 | kfree(res); | |
404 | ||
405 | return data_len; | |
406 | ||
407 | err: | |
408 | kfree(data); | |
409 | kfree(res); | |
410 | ||
411 | return ret; | |
412 | } | |
413 | ||
414 | static int tb_xdp_properties_response(struct tb *tb, struct tb_ctl *ctl, | |
46b494f2 | 415 | struct tb_xdomain *xd, u8 sequence, const struct tb_xdp_properties *req) |
d1ff7024 MW |
416 | { |
417 | struct tb_xdp_properties_response *res; | |
418 | size_t total_size; | |
419 | u16 len; | |
420 | int ret; | |
421 | ||
422 | /* | |
423 | * Currently we expect all requests to be directed to us. The | |
424 | * protocol supports forwarding, though which we might add | |
425 | * support later on. | |
426 | */ | |
46b494f2 MW |
427 | if (!uuid_equal(xd->local_uuid, &req->dst_uuid)) { |
428 | tb_xdp_error_response(ctl, xd->route, sequence, | |
d1ff7024 MW |
429 | ERROR_UNKNOWN_DOMAIN); |
430 | return 0; | |
431 | } | |
432 | ||
46b494f2 | 433 | mutex_lock(&xd->lock); |
d1ff7024 | 434 | |
46b494f2 MW |
435 | if (req->offset >= xd->local_property_block_len) { |
436 | mutex_unlock(&xd->lock); | |
d1ff7024 MW |
437 | return -EINVAL; |
438 | } | |
439 | ||
46b494f2 | 440 | len = xd->local_property_block_len - req->offset; |
d1ff7024 MW |
441 | len = min_t(u16, len, TB_XDP_PROPERTIES_MAX_DATA_LENGTH); |
442 | total_size = sizeof(*res) + len * 4; | |
443 | ||
444 | res = kzalloc(total_size, GFP_KERNEL); | |
445 | if (!res) { | |
46b494f2 | 446 | mutex_unlock(&xd->lock); |
d1ff7024 MW |
447 | return -ENOMEM; |
448 | } | |
449 | ||
46b494f2 | 450 | tb_xdp_fill_header(&res->hdr, xd->route, sequence, PROPERTIES_RESPONSE, |
d1ff7024 | 451 | total_size); |
46b494f2 MW |
452 | res->generation = xd->local_property_block_gen; |
453 | res->data_length = xd->local_property_block_len; | |
d1ff7024 | 454 | res->offset = req->offset; |
46b494f2 | 455 | uuid_copy(&res->src_uuid, xd->local_uuid); |
d1ff7024 | 456 | uuid_copy(&res->dst_uuid, &req->src_uuid); |
46b494f2 | 457 | memcpy(res->data, &xd->local_property_block[req->offset], len * 4); |
d1ff7024 | 458 | |
46b494f2 | 459 | mutex_unlock(&xd->lock); |
d1ff7024 MW |
460 | |
461 | ret = __tb_xdomain_response(ctl, res, total_size, | |
462 | TB_CFG_PKG_XDOMAIN_RESP); | |
463 | ||
464 | kfree(res); | |
465 | return ret; | |
466 | } | |
467 | ||
468 | static int tb_xdp_properties_changed_request(struct tb_ctl *ctl, u64 route, | |
469 | int retry, const uuid_t *uuid) | |
470 | { | |
471 | struct tb_xdp_properties_changed_response res; | |
472 | struct tb_xdp_properties_changed req; | |
473 | int ret; | |
474 | ||
475 | memset(&req, 0, sizeof(req)); | |
476 | tb_xdp_fill_header(&req.hdr, route, retry % 4, | |
477 | PROPERTIES_CHANGED_REQUEST, sizeof(req)); | |
478 | uuid_copy(&req.src_uuid, uuid); | |
479 | ||
480 | memset(&res, 0, sizeof(res)); | |
481 | ret = __tb_xdomain_request(ctl, &req, sizeof(req), | |
482 | TB_CFG_PKG_XDOMAIN_REQ, &res, sizeof(res), | |
483 | TB_CFG_PKG_XDOMAIN_RESP, | |
484 | XDOMAIN_DEFAULT_TIMEOUT); | |
485 | if (ret) | |
486 | return ret; | |
487 | ||
19813551 | 488 | return tb_xdp_handle_error(&res.err); |
d1ff7024 MW |
489 | } |
490 | ||
491 | static int | |
492 | tb_xdp_properties_changed_response(struct tb_ctl *ctl, u64 route, u8 sequence) | |
493 | { | |
494 | struct tb_xdp_properties_changed_response res; | |
495 | ||
496 | memset(&res, 0, sizeof(res)); | |
497 | tb_xdp_fill_header(&res.hdr, route, sequence, | |
498 | PROPERTIES_CHANGED_RESPONSE, sizeof(res)); | |
499 | return __tb_xdomain_response(ctl, &res, sizeof(res), | |
500 | TB_CFG_PKG_XDOMAIN_RESP); | |
501 | } | |
502 | ||
8e1de704 MW |
503 | static int tb_xdp_link_state_status_request(struct tb_ctl *ctl, u64 route, |
504 | u8 sequence, u8 *slw, u8 *tlw, | |
505 | u8 *sls, u8 *tls) | |
506 | { | |
507 | struct tb_xdp_link_state_status_response res; | |
508 | struct tb_xdp_link_state_status req; | |
509 | int ret; | |
510 | ||
511 | memset(&req, 0, sizeof(req)); | |
512 | tb_xdp_fill_header(&req.hdr, route, sequence, LINK_STATE_STATUS_REQUEST, | |
513 | sizeof(req)); | |
514 | ||
515 | memset(&res, 0, sizeof(res)); | |
516 | ret = __tb_xdomain_request(ctl, &req, sizeof(req), TB_CFG_PKG_XDOMAIN_REQ, | |
517 | &res, sizeof(res), TB_CFG_PKG_XDOMAIN_RESP, | |
518 | XDOMAIN_DEFAULT_TIMEOUT); | |
519 | if (ret) | |
520 | return ret; | |
521 | ||
522 | ret = tb_xdp_handle_error(&res.err); | |
523 | if (ret) | |
524 | return ret; | |
525 | ||
526 | if (res.status != 0) | |
527 | return -EREMOTEIO; | |
528 | ||
529 | *slw = res.slw; | |
530 | *tlw = res.tlw; | |
531 | *sls = res.sls; | |
532 | *tls = res.tls; | |
533 | ||
534 | return 0; | |
535 | } | |
536 | ||
537 | static int tb_xdp_link_state_status_response(struct tb *tb, struct tb_ctl *ctl, | |
538 | struct tb_xdomain *xd, u8 sequence) | |
539 | { | |
540 | struct tb_switch *sw = tb_to_switch(xd->dev.parent); | |
541 | struct tb_xdp_link_state_status_response res; | |
542 | struct tb_port *port = tb_port_at(xd->route, sw); | |
543 | u32 val[2]; | |
544 | int ret; | |
545 | ||
546 | memset(&res, 0, sizeof(res)); | |
547 | tb_xdp_fill_header(&res.hdr, xd->route, sequence, | |
548 | LINK_STATE_STATUS_RESPONSE, sizeof(res)); | |
549 | ||
550 | ret = tb_port_read(port, val, TB_CFG_PORT, | |
551 | port->cap_phy + LANE_ADP_CS_0, ARRAY_SIZE(val)); | |
552 | if (ret) | |
553 | return ret; | |
554 | ||
555 | res.slw = (val[0] & LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK) >> | |
556 | LANE_ADP_CS_0_SUPPORTED_WIDTH_SHIFT; | |
557 | res.sls = (val[0] & LANE_ADP_CS_0_SUPPORTED_SPEED_MASK) >> | |
558 | LANE_ADP_CS_0_SUPPORTED_SPEED_SHIFT; | |
559 | res.tls = val[1] & LANE_ADP_CS_1_TARGET_SPEED_MASK; | |
560 | res.tlw = (val[1] & LANE_ADP_CS_1_TARGET_WIDTH_MASK) >> | |
561 | LANE_ADP_CS_1_TARGET_WIDTH_SHIFT; | |
562 | ||
563 | return __tb_xdomain_response(ctl, &res, sizeof(res), | |
564 | TB_CFG_PKG_XDOMAIN_RESP); | |
565 | } | |
566 | ||
567 | static int tb_xdp_link_state_change_request(struct tb_ctl *ctl, u64 route, | |
568 | u8 sequence, u8 tlw, u8 tls) | |
569 | { | |
570 | struct tb_xdp_link_state_change_response res; | |
571 | struct tb_xdp_link_state_change req; | |
572 | int ret; | |
573 | ||
574 | memset(&req, 0, sizeof(req)); | |
575 | tb_xdp_fill_header(&req.hdr, route, sequence, LINK_STATE_CHANGE_REQUEST, | |
576 | sizeof(req)); | |
577 | req.tlw = tlw; | |
578 | req.tls = tls; | |
579 | ||
580 | memset(&res, 0, sizeof(res)); | |
581 | ret = __tb_xdomain_request(ctl, &req, sizeof(req), TB_CFG_PKG_XDOMAIN_REQ, | |
582 | &res, sizeof(res), TB_CFG_PKG_XDOMAIN_RESP, | |
583 | XDOMAIN_DEFAULT_TIMEOUT); | |
584 | if (ret) | |
585 | return ret; | |
586 | ||
587 | ret = tb_xdp_handle_error(&res.err); | |
588 | if (ret) | |
589 | return ret; | |
590 | ||
591 | return res.status != 0 ? -EREMOTEIO : 0; | |
592 | } | |
593 | ||
594 | static int tb_xdp_link_state_change_response(struct tb_ctl *ctl, u64 route, | |
595 | u8 sequence, u32 status) | |
596 | { | |
597 | struct tb_xdp_link_state_change_response res; | |
598 | ||
599 | memset(&res, 0, sizeof(res)); | |
600 | tb_xdp_fill_header(&res.hdr, route, sequence, LINK_STATE_CHANGE_RESPONSE, | |
601 | sizeof(res)); | |
602 | ||
603 | res.status = status; | |
604 | ||
605 | return __tb_xdomain_response(ctl, &res, sizeof(res), | |
606 | TB_CFG_PKG_XDOMAIN_RESP); | |
607 | } | |
608 | ||
d1ff7024 MW |
609 | /** |
610 | * tb_register_protocol_handler() - Register protocol handler | |
611 | * @handler: Handler to register | |
612 | * | |
613 | * This allows XDomain service drivers to hook into incoming XDomain | |
614 | * messages. After this function is called the service driver needs to | |
615 | * be able to handle calls to callback whenever a package with the | |
616 | * registered protocol is received. | |
617 | */ | |
618 | int tb_register_protocol_handler(struct tb_protocol_handler *handler) | |
619 | { | |
620 | if (!handler->uuid || !handler->callback) | |
621 | return -EINVAL; | |
622 | if (uuid_equal(handler->uuid, &tb_xdp_uuid)) | |
623 | return -EINVAL; | |
624 | ||
625 | mutex_lock(&xdomain_lock); | |
626 | list_add_tail(&handler->list, &protocol_handlers); | |
627 | mutex_unlock(&xdomain_lock); | |
628 | ||
629 | return 0; | |
630 | } | |
631 | EXPORT_SYMBOL_GPL(tb_register_protocol_handler); | |
632 | ||
633 | /** | |
634 | * tb_unregister_protocol_handler() - Unregister protocol handler | |
635 | * @handler: Handler to unregister | |
636 | * | |
637 | * Removes the previously registered protocol handler. | |
638 | */ | |
639 | void tb_unregister_protocol_handler(struct tb_protocol_handler *handler) | |
640 | { | |
641 | mutex_lock(&xdomain_lock); | |
642 | list_del_init(&handler->list); | |
643 | mutex_unlock(&xdomain_lock); | |
644 | } | |
645 | EXPORT_SYMBOL_GPL(tb_unregister_protocol_handler); | |
646 | ||
46b494f2 | 647 | static void update_property_block(struct tb_xdomain *xd) |
8a00c67e | 648 | { |
46b494f2 MW |
649 | mutex_lock(&xdomain_lock); |
650 | mutex_lock(&xd->lock); | |
651 | /* | |
652 | * If the local property block is not up-to-date, rebuild it now | |
653 | * based on the global property template. | |
654 | */ | |
655 | if (!xd->local_property_block || | |
656 | xd->local_property_block_gen < xdomain_property_block_gen) { | |
657 | struct tb_property_dir *dir; | |
658 | int ret, block_len; | |
659 | u32 *block; | |
660 | ||
661 | dir = tb_property_copy_dir(xdomain_property_dir); | |
662 | if (!dir) { | |
663 | dev_warn(&xd->dev, "failed to copy properties\n"); | |
664 | goto out_unlock; | |
665 | } | |
8a00c67e | 666 | |
46b494f2 MW |
667 | /* Fill in non-static properties now */ |
668 | tb_property_add_text(dir, "deviceid", utsname()->nodename); | |
669 | tb_property_add_immediate(dir, "maxhopid", xd->local_max_hopid); | |
8a00c67e | 670 | |
46b494f2 MW |
671 | ret = tb_property_format_dir(dir, NULL, 0); |
672 | if (ret < 0) { | |
673 | dev_warn(&xd->dev, "local property block creation failed\n"); | |
674 | tb_property_free_dir(dir); | |
675 | goto out_unlock; | |
676 | } | |
8a00c67e | 677 | |
46b494f2 MW |
678 | block_len = ret; |
679 | block = kcalloc(block_len, sizeof(*block), GFP_KERNEL); | |
680 | if (!block) { | |
681 | tb_property_free_dir(dir); | |
682 | goto out_unlock; | |
683 | } | |
8a00c67e | 684 | |
46b494f2 MW |
685 | ret = tb_property_format_dir(dir, block, block_len); |
686 | if (ret) { | |
687 | dev_warn(&xd->dev, "property block generation failed\n"); | |
688 | tb_property_free_dir(dir); | |
689 | kfree(block); | |
690 | goto out_unlock; | |
691 | } | |
8a00c67e | 692 | |
46b494f2 MW |
693 | tb_property_free_dir(dir); |
694 | /* Release the previous block */ | |
695 | kfree(xd->local_property_block); | |
696 | /* Assign new one */ | |
697 | xd->local_property_block = block; | |
698 | xd->local_property_block_len = block_len; | |
699 | xd->local_property_block_gen = xdomain_property_block_gen; | |
8a00c67e | 700 | } |
46b494f2 MW |
701 | |
702 | out_unlock: | |
703 | mutex_unlock(&xd->lock); | |
8a00c67e MW |
704 | mutex_unlock(&xdomain_lock); |
705 | } | |
706 | ||
d1ff7024 MW |
707 | static void tb_xdp_handle_request(struct work_struct *work) |
708 | { | |
709 | struct xdomain_request_work *xw = container_of(work, typeof(*xw), work); | |
710 | const struct tb_xdp_header *pkg = xw->pkg; | |
711 | const struct tb_xdomain_header *xhdr = &pkg->xd_hdr; | |
712 | struct tb *tb = xw->tb; | |
713 | struct tb_ctl *ctl = tb->ctl; | |
46b494f2 | 714 | struct tb_xdomain *xd; |
d1ff7024 MW |
715 | const uuid_t *uuid; |
716 | int ret = 0; | |
9a03c3d3 | 717 | u32 sequence; |
d1ff7024 MW |
718 | u64 route; |
719 | ||
720 | route = ((u64)xhdr->route_hi << 32 | xhdr->route_lo) & ~BIT_ULL(63); | |
721 | sequence = xhdr->length_sn & TB_XDOMAIN_SN_MASK; | |
722 | sequence >>= TB_XDOMAIN_SN_SHIFT; | |
723 | ||
724 | mutex_lock(&tb->lock); | |
725 | if (tb->root_switch) | |
726 | uuid = tb->root_switch->uuid; | |
727 | else | |
728 | uuid = NULL; | |
729 | mutex_unlock(&tb->lock); | |
730 | ||
731 | if (!uuid) { | |
732 | tb_xdp_error_response(ctl, route, sequence, ERROR_NOT_READY); | |
733 | goto out; | |
734 | } | |
735 | ||
46b494f2 MW |
736 | xd = tb_xdomain_find_by_route_locked(tb, route); |
737 | if (xd) | |
738 | update_property_block(xd); | |
739 | ||
d1ff7024 MW |
740 | switch (pkg->type) { |
741 | case PROPERTIES_REQUEST: | |
8e1de704 | 742 | tb_dbg(tb, "%llx: received XDomain properties request\n", route); |
46b494f2 MW |
743 | if (xd) { |
744 | ret = tb_xdp_properties_response(tb, ctl, xd, sequence, | |
745 | (const struct tb_xdp_properties *)pkg); | |
746 | } | |
d1ff7024 MW |
747 | break; |
748 | ||
46b494f2 | 749 | case PROPERTIES_CHANGED_REQUEST: |
8e1de704 MW |
750 | tb_dbg(tb, "%llx: received XDomain properties changed request\n", |
751 | route); | |
752 | ||
d1ff7024 MW |
753 | ret = tb_xdp_properties_changed_response(ctl, route, sequence); |
754 | ||
755 | /* | |
756 | * Since the properties have been changed, let's update | |
757 | * the xdomain related to this connection as well in | |
758 | * case there is a change in services it offers. | |
759 | */ | |
8e1de704 MW |
760 | if (xd && device_is_registered(&xd->dev)) |
761 | queue_delayed_work(tb->wq, &xd->state_work, | |
762 | msecs_to_jiffies(XDOMAIN_SHORT_TIMEOUT)); | |
d1ff7024 | 763 | break; |
d1ff7024 | 764 | |
3b4b3235 MW |
765 | case UUID_REQUEST_OLD: |
766 | case UUID_REQUEST: | |
8e1de704 | 767 | tb_dbg(tb, "%llx: received XDomain UUID request\n", route); |
3b4b3235 MW |
768 | ret = tb_xdp_uuid_response(ctl, route, sequence, uuid); |
769 | break; | |
770 | ||
8e1de704 MW |
771 | case LINK_STATE_STATUS_REQUEST: |
772 | tb_dbg(tb, "%llx: received XDomain link state status request\n", | |
773 | route); | |
774 | ||
775 | if (xd) { | |
776 | ret = tb_xdp_link_state_status_response(tb, ctl, xd, | |
777 | sequence); | |
778 | } else { | |
779 | tb_xdp_error_response(ctl, route, sequence, | |
780 | ERROR_NOT_READY); | |
781 | } | |
782 | break; | |
783 | ||
784 | case LINK_STATE_CHANGE_REQUEST: | |
785 | tb_dbg(tb, "%llx: received XDomain link state change request\n", | |
786 | route); | |
787 | ||
788 | if (xd && xd->state == XDOMAIN_STATE_BONDING_UUID_HIGH) { | |
789 | const struct tb_xdp_link_state_change *lsc = | |
790 | (const struct tb_xdp_link_state_change *)pkg; | |
791 | ||
792 | ret = tb_xdp_link_state_change_response(ctl, route, | |
793 | sequence, 0); | |
794 | xd->target_link_width = lsc->tlw; | |
795 | queue_delayed_work(tb->wq, &xd->state_work, | |
796 | msecs_to_jiffies(XDOMAIN_SHORT_TIMEOUT)); | |
797 | } else { | |
798 | tb_xdp_error_response(ctl, route, sequence, | |
799 | ERROR_NOT_READY); | |
800 | } | |
801 | break; | |
802 | ||
d1ff7024 | 803 | default: |
8e1de704 | 804 | tb_dbg(tb, "%llx: unknown XDomain request %#x\n", route, pkg->type); |
3b4b3235 MW |
805 | tb_xdp_error_response(ctl, route, sequence, |
806 | ERROR_NOT_SUPPORTED); | |
d1ff7024 MW |
807 | break; |
808 | } | |
809 | ||
46b494f2 MW |
810 | tb_xdomain_put(xd); |
811 | ||
d1ff7024 MW |
812 | if (ret) { |
813 | tb_warn(tb, "failed to send XDomain response for %#x\n", | |
814 | pkg->type); | |
815 | } | |
816 | ||
817 | out: | |
818 | kfree(xw->pkg); | |
819 | kfree(xw); | |
559c1e1e MW |
820 | |
821 | tb_domain_put(tb); | |
d1ff7024 MW |
822 | } |
823 | ||
48f40b96 | 824 | static bool |
d1ff7024 MW |
825 | tb_xdp_schedule_request(struct tb *tb, const struct tb_xdp_header *hdr, |
826 | size_t size) | |
827 | { | |
828 | struct xdomain_request_work *xw; | |
829 | ||
830 | xw = kmalloc(sizeof(*xw), GFP_KERNEL); | |
831 | if (!xw) | |
48f40b96 | 832 | return false; |
d1ff7024 MW |
833 | |
834 | INIT_WORK(&xw->work, tb_xdp_handle_request); | |
835 | xw->pkg = kmemdup(hdr, size, GFP_KERNEL); | |
48f40b96 AP |
836 | if (!xw->pkg) { |
837 | kfree(xw); | |
838 | return false; | |
839 | } | |
559c1e1e | 840 | xw->tb = tb_domain_get(tb); |
d1ff7024 | 841 | |
559c1e1e | 842 | schedule_work(&xw->work); |
48f40b96 | 843 | return true; |
d1ff7024 MW |
844 | } |
845 | ||
846 | /** | |
847 | * tb_register_service_driver() - Register XDomain service driver | |
848 | * @drv: Driver to register | |
849 | * | |
850 | * Registers new service driver from @drv to the bus. | |
851 | */ | |
852 | int tb_register_service_driver(struct tb_service_driver *drv) | |
853 | { | |
854 | drv->driver.bus = &tb_bus_type; | |
855 | return driver_register(&drv->driver); | |
856 | } | |
857 | EXPORT_SYMBOL_GPL(tb_register_service_driver); | |
858 | ||
859 | /** | |
860 | * tb_unregister_service_driver() - Unregister XDomain service driver | |
925a2af9 | 861 | * @drv: Driver to unregister |
d1ff7024 MW |
862 | * |
863 | * Unregisters XDomain service driver from the bus. | |
864 | */ | |
865 | void tb_unregister_service_driver(struct tb_service_driver *drv) | |
866 | { | |
867 | driver_unregister(&drv->driver); | |
868 | } | |
869 | EXPORT_SYMBOL_GPL(tb_unregister_service_driver); | |
870 | ||
871 | static ssize_t key_show(struct device *dev, struct device_attribute *attr, | |
872 | char *buf) | |
873 | { | |
874 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
875 | ||
876 | /* | |
877 | * It should be null terminated but anything else is pretty much | |
878 | * allowed. | |
879 | */ | |
8283fb57 | 880 | return sysfs_emit(buf, "%*pE\n", (int)strlen(svc->key), svc->key); |
d1ff7024 MW |
881 | } |
882 | static DEVICE_ATTR_RO(key); | |
883 | ||
884 | static int get_modalias(struct tb_service *svc, char *buf, size_t size) | |
885 | { | |
886 | return snprintf(buf, size, "tbsvc:k%sp%08Xv%08Xr%08X", svc->key, | |
887 | svc->prtcid, svc->prtcvers, svc->prtcrevs); | |
888 | } | |
889 | ||
890 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | |
891 | char *buf) | |
892 | { | |
893 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
894 | ||
895 | /* Full buffer size except new line and null termination */ | |
896 | get_modalias(svc, buf, PAGE_SIZE - 2); | |
0a0624a2 | 897 | return strlen(strcat(buf, "\n")); |
d1ff7024 MW |
898 | } |
899 | static DEVICE_ATTR_RO(modalias); | |
900 | ||
901 | static ssize_t prtcid_show(struct device *dev, struct device_attribute *attr, | |
902 | char *buf) | |
903 | { | |
904 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
905 | ||
8283fb57 | 906 | return sysfs_emit(buf, "%u\n", svc->prtcid); |
d1ff7024 MW |
907 | } |
908 | static DEVICE_ATTR_RO(prtcid); | |
909 | ||
910 | static ssize_t prtcvers_show(struct device *dev, struct device_attribute *attr, | |
911 | char *buf) | |
912 | { | |
913 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
914 | ||
8283fb57 | 915 | return sysfs_emit(buf, "%u\n", svc->prtcvers); |
d1ff7024 MW |
916 | } |
917 | static DEVICE_ATTR_RO(prtcvers); | |
918 | ||
919 | static ssize_t prtcrevs_show(struct device *dev, struct device_attribute *attr, | |
920 | char *buf) | |
921 | { | |
922 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
923 | ||
8283fb57 | 924 | return sysfs_emit(buf, "%u\n", svc->prtcrevs); |
d1ff7024 MW |
925 | } |
926 | static DEVICE_ATTR_RO(prtcrevs); | |
927 | ||
928 | static ssize_t prtcstns_show(struct device *dev, struct device_attribute *attr, | |
929 | char *buf) | |
930 | { | |
931 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
932 | ||
8283fb57 | 933 | return sysfs_emit(buf, "0x%08x\n", svc->prtcstns); |
d1ff7024 MW |
934 | } |
935 | static DEVICE_ATTR_RO(prtcstns); | |
936 | ||
937 | static struct attribute *tb_service_attrs[] = { | |
938 | &dev_attr_key.attr, | |
939 | &dev_attr_modalias.attr, | |
940 | &dev_attr_prtcid.attr, | |
941 | &dev_attr_prtcvers.attr, | |
942 | &dev_attr_prtcrevs.attr, | |
943 | &dev_attr_prtcstns.attr, | |
944 | NULL, | |
945 | }; | |
946 | ||
6889e00f | 947 | static const struct attribute_group tb_service_attr_group = { |
d1ff7024 MW |
948 | .attrs = tb_service_attrs, |
949 | }; | |
950 | ||
951 | static const struct attribute_group *tb_service_attr_groups[] = { | |
952 | &tb_service_attr_group, | |
953 | NULL, | |
954 | }; | |
955 | ||
956 | static int tb_service_uevent(struct device *dev, struct kobj_uevent_env *env) | |
957 | { | |
958 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
959 | char modalias[64]; | |
960 | ||
961 | get_modalias(svc, modalias, sizeof(modalias)); | |
962 | return add_uevent_var(env, "MODALIAS=%s", modalias); | |
963 | } | |
964 | ||
965 | static void tb_service_release(struct device *dev) | |
966 | { | |
967 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
968 | struct tb_xdomain *xd = tb_service_parent(svc); | |
969 | ||
407ac931 | 970 | tb_service_debugfs_remove(svc); |
d1ff7024 MW |
971 | ida_simple_remove(&xd->service_ids, svc->id); |
972 | kfree(svc->key); | |
973 | kfree(svc); | |
974 | } | |
975 | ||
976 | struct device_type tb_service_type = { | |
977 | .name = "thunderbolt_service", | |
978 | .groups = tb_service_attr_groups, | |
979 | .uevent = tb_service_uevent, | |
980 | .release = tb_service_release, | |
981 | }; | |
982 | EXPORT_SYMBOL_GPL(tb_service_type); | |
983 | ||
984 | static int remove_missing_service(struct device *dev, void *data) | |
985 | { | |
986 | struct tb_xdomain *xd = data; | |
987 | struct tb_service *svc; | |
988 | ||
989 | svc = tb_to_service(dev); | |
990 | if (!svc) | |
991 | return 0; | |
992 | ||
46b494f2 | 993 | if (!tb_property_find(xd->remote_properties, svc->key, |
d1ff7024 MW |
994 | TB_PROPERTY_TYPE_DIRECTORY)) |
995 | device_unregister(dev); | |
996 | ||
997 | return 0; | |
998 | } | |
999 | ||
1000 | static int find_service(struct device *dev, void *data) | |
1001 | { | |
1002 | const struct tb_property *p = data; | |
1003 | struct tb_service *svc; | |
1004 | ||
1005 | svc = tb_to_service(dev); | |
1006 | if (!svc) | |
1007 | return 0; | |
1008 | ||
1009 | return !strcmp(svc->key, p->key); | |
1010 | } | |
1011 | ||
1012 | static int populate_service(struct tb_service *svc, | |
1013 | struct tb_property *property) | |
1014 | { | |
1015 | struct tb_property_dir *dir = property->value.dir; | |
1016 | struct tb_property *p; | |
1017 | ||
1018 | /* Fill in standard properties */ | |
1019 | p = tb_property_find(dir, "prtcid", TB_PROPERTY_TYPE_VALUE); | |
1020 | if (p) | |
1021 | svc->prtcid = p->value.immediate; | |
1022 | p = tb_property_find(dir, "prtcvers", TB_PROPERTY_TYPE_VALUE); | |
1023 | if (p) | |
1024 | svc->prtcvers = p->value.immediate; | |
1025 | p = tb_property_find(dir, "prtcrevs", TB_PROPERTY_TYPE_VALUE); | |
1026 | if (p) | |
1027 | svc->prtcrevs = p->value.immediate; | |
1028 | p = tb_property_find(dir, "prtcstns", TB_PROPERTY_TYPE_VALUE); | |
1029 | if (p) | |
1030 | svc->prtcstns = p->value.immediate; | |
1031 | ||
1032 | svc->key = kstrdup(property->key, GFP_KERNEL); | |
1033 | if (!svc->key) | |
1034 | return -ENOMEM; | |
1035 | ||
1036 | return 0; | |
1037 | } | |
1038 | ||
1039 | static void enumerate_services(struct tb_xdomain *xd) | |
1040 | { | |
1041 | struct tb_service *svc; | |
1042 | struct tb_property *p; | |
1043 | struct device *dev; | |
9aabb685 | 1044 | int id; |
d1ff7024 MW |
1045 | |
1046 | /* | |
1047 | * First remove all services that are not available anymore in | |
1048 | * the updated property block. | |
1049 | */ | |
1050 | device_for_each_child_reverse(&xd->dev, xd, remove_missing_service); | |
1051 | ||
1052 | /* Then re-enumerate properties creating new services as we go */ | |
46b494f2 | 1053 | tb_property_for_each(xd->remote_properties, p) { |
d1ff7024 MW |
1054 | if (p->type != TB_PROPERTY_TYPE_DIRECTORY) |
1055 | continue; | |
1056 | ||
1057 | /* If the service exists already we are fine */ | |
1058 | dev = device_find_child(&xd->dev, p, find_service); | |
1059 | if (dev) { | |
1060 | put_device(dev); | |
1061 | continue; | |
1062 | } | |
1063 | ||
1064 | svc = kzalloc(sizeof(*svc), GFP_KERNEL); | |
1065 | if (!svc) | |
1066 | break; | |
1067 | ||
1068 | if (populate_service(svc, p)) { | |
1069 | kfree(svc); | |
1070 | break; | |
1071 | } | |
1072 | ||
9aabb685 AP |
1073 | id = ida_simple_get(&xd->service_ids, 0, 0, GFP_KERNEL); |
1074 | if (id < 0) { | |
a663e0df | 1075 | kfree(svc->key); |
9aabb685 AP |
1076 | kfree(svc); |
1077 | break; | |
1078 | } | |
1079 | svc->id = id; | |
d1ff7024 MW |
1080 | svc->dev.bus = &tb_bus_type; |
1081 | svc->dev.type = &tb_service_type; | |
1082 | svc->dev.parent = &xd->dev; | |
1083 | dev_set_name(&svc->dev, "%s.%d", dev_name(&xd->dev), svc->id); | |
1084 | ||
407ac931 MW |
1085 | tb_service_debugfs_init(svc); |
1086 | ||
d1ff7024 MW |
1087 | if (device_register(&svc->dev)) { |
1088 | put_device(&svc->dev); | |
1089 | break; | |
1090 | } | |
1091 | } | |
1092 | } | |
1093 | ||
1094 | static int populate_properties(struct tb_xdomain *xd, | |
1095 | struct tb_property_dir *dir) | |
1096 | { | |
1097 | const struct tb_property *p; | |
1098 | ||
1099 | /* Required properties */ | |
1100 | p = tb_property_find(dir, "deviceid", TB_PROPERTY_TYPE_VALUE); | |
1101 | if (!p) | |
1102 | return -EINVAL; | |
1103 | xd->device = p->value.immediate; | |
1104 | ||
1105 | p = tb_property_find(dir, "vendorid", TB_PROPERTY_TYPE_VALUE); | |
1106 | if (!p) | |
1107 | return -EINVAL; | |
1108 | xd->vendor = p->value.immediate; | |
1109 | ||
46b494f2 MW |
1110 | p = tb_property_find(dir, "maxhopid", TB_PROPERTY_TYPE_VALUE); |
1111 | /* | |
1112 | * USB4 inter-domain spec suggests using 15 as HopID if the | |
1113 | * other end does not announce it in a property. This is for | |
1114 | * TBT3 compatibility. | |
1115 | */ | |
1116 | xd->remote_max_hopid = p ? p->value.immediate : XDOMAIN_DEFAULT_MAX_HOPID; | |
1117 | ||
d1ff7024 MW |
1118 | kfree(xd->device_name); |
1119 | xd->device_name = NULL; | |
1120 | kfree(xd->vendor_name); | |
1121 | xd->vendor_name = NULL; | |
1122 | ||
1123 | /* Optional properties */ | |
1124 | p = tb_property_find(dir, "deviceid", TB_PROPERTY_TYPE_TEXT); | |
1125 | if (p) | |
1126 | xd->device_name = kstrdup(p->value.text, GFP_KERNEL); | |
1127 | p = tb_property_find(dir, "vendorid", TB_PROPERTY_TYPE_TEXT); | |
1128 | if (p) | |
1129 | xd->vendor_name = kstrdup(p->value.text, GFP_KERNEL); | |
1130 | ||
1131 | return 0; | |
1132 | } | |
1133 | ||
4210d50f IH |
1134 | static int tb_xdomain_update_link_attributes(struct tb_xdomain *xd) |
1135 | { | |
1136 | bool change = false; | |
1137 | struct tb_port *port; | |
1138 | int ret; | |
1139 | ||
1140 | port = tb_port_at(xd->route, tb_xdomain_parent(xd)); | |
1141 | ||
1142 | ret = tb_port_get_link_speed(port); | |
1143 | if (ret < 0) | |
1144 | return ret; | |
1145 | ||
1146 | if (xd->link_speed != ret) | |
1147 | change = true; | |
1148 | ||
1149 | xd->link_speed = ret; | |
1150 | ||
1151 | ret = tb_port_get_link_width(port); | |
1152 | if (ret < 0) | |
1153 | return ret; | |
1154 | ||
1155 | if (xd->link_width != ret) | |
1156 | change = true; | |
1157 | ||
1158 | xd->link_width = ret; | |
1159 | ||
1160 | if (change) | |
1161 | kobject_uevent(&xd->dev.kobj, KOBJ_CHANGE); | |
1162 | ||
1163 | return 0; | |
1164 | } | |
1165 | ||
8e1de704 | 1166 | static int tb_xdomain_get_uuid(struct tb_xdomain *xd) |
3b4b3235 | 1167 | { |
3b4b3235 MW |
1168 | struct tb *tb = xd->tb; |
1169 | uuid_t uuid; | |
8e1de704 | 1170 | u64 route; |
3b4b3235 MW |
1171 | int ret; |
1172 | ||
d29c59b1 MW |
1173 | dev_dbg(&xd->dev, "requesting remote UUID\n"); |
1174 | ||
8e1de704 MW |
1175 | ret = tb_xdp_uuid_request(tb->ctl, xd->route, xd->state_retries, &uuid, |
1176 | &route); | |
3b4b3235 | 1177 | if (ret < 0) { |
8e1de704 | 1178 | if (xd->state_retries-- > 0) { |
d29c59b1 | 1179 | dev_dbg(&xd->dev, "failed to request UUID, retrying\n"); |
8e1de704 | 1180 | return -EAGAIN; |
3b4b3235 MW |
1181 | } else { |
1182 | dev_dbg(&xd->dev, "failed to read remote UUID\n"); | |
1183 | } | |
8e1de704 | 1184 | return ret; |
3b4b3235 MW |
1185 | } |
1186 | ||
d29c59b1 MW |
1187 | dev_dbg(&xd->dev, "got remote UUID %pUb\n", &uuid); |
1188 | ||
8e1de704 MW |
1189 | if (uuid_equal(&uuid, xd->local_uuid)) { |
1190 | if (route == xd->route) | |
1191 | dev_dbg(&xd->dev, "loop back detected\n"); | |
1192 | else | |
1193 | dev_dbg(&xd->dev, "intra-domain loop detected\n"); | |
1194 | ||
1195 | /* Don't bond lanes automatically for loops */ | |
1196 | xd->bonding_possible = false; | |
1197 | } | |
3b4b3235 MW |
1198 | |
1199 | /* | |
1200 | * If the UUID is different, there is another domain connected | |
1201 | * so mark this one unplugged and wait for the connection | |
1202 | * manager to replace it. | |
1203 | */ | |
1204 | if (xd->remote_uuid && !uuid_equal(&uuid, xd->remote_uuid)) { | |
1205 | dev_dbg(&xd->dev, "remote UUID is different, unplugging\n"); | |
1206 | xd->is_unplugged = true; | |
8e1de704 | 1207 | return -ENODEV; |
3b4b3235 MW |
1208 | } |
1209 | ||
1210 | /* First time fill in the missing UUID */ | |
1211 | if (!xd->remote_uuid) { | |
1212 | xd->remote_uuid = kmemdup(&uuid, sizeof(uuid_t), GFP_KERNEL); | |
1213 | if (!xd->remote_uuid) | |
8e1de704 | 1214 | return -ENOMEM; |
3b4b3235 MW |
1215 | } |
1216 | ||
8e1de704 | 1217 | return 0; |
3b4b3235 MW |
1218 | } |
1219 | ||
8e1de704 MW |
1220 | static int tb_xdomain_get_link_status(struct tb_xdomain *xd) |
1221 | { | |
1222 | struct tb *tb = xd->tb; | |
1223 | u8 slw, tlw, sls, tls; | |
1224 | int ret; | |
1225 | ||
1226 | dev_dbg(&xd->dev, "sending link state status request to %pUb\n", | |
1227 | xd->remote_uuid); | |
1228 | ||
1229 | ret = tb_xdp_link_state_status_request(tb->ctl, xd->route, | |
1230 | xd->state_retries, &slw, &tlw, &sls, | |
1231 | &tls); | |
1232 | if (ret) { | |
1233 | if (ret != -EOPNOTSUPP && xd->state_retries-- > 0) { | |
1234 | dev_dbg(&xd->dev, | |
1235 | "failed to request remote link status, retrying\n"); | |
1236 | return -EAGAIN; | |
1237 | } | |
1238 | dev_dbg(&xd->dev, "failed to receive remote link status\n"); | |
1239 | return ret; | |
1240 | } | |
1241 | ||
1242 | dev_dbg(&xd->dev, "remote link supports width %#x speed %#x\n", slw, sls); | |
1243 | ||
1244 | if (slw < LANE_ADP_CS_0_SUPPORTED_WIDTH_DUAL) { | |
1245 | dev_dbg(&xd->dev, "remote adapter is single lane only\n"); | |
1246 | return -EOPNOTSUPP; | |
1247 | } | |
1248 | ||
1249 | return 0; | |
1250 | } | |
1251 | ||
1252 | static int tb_xdomain_link_state_change(struct tb_xdomain *xd, | |
1253 | unsigned int width) | |
1254 | { | |
1255 | struct tb_switch *sw = tb_to_switch(xd->dev.parent); | |
1256 | struct tb_port *port = tb_port_at(xd->route, sw); | |
1257 | struct tb *tb = xd->tb; | |
1258 | u8 tlw, tls; | |
1259 | u32 val; | |
1260 | int ret; | |
1261 | ||
1262 | if (width == 2) | |
1263 | tlw = LANE_ADP_CS_1_TARGET_WIDTH_DUAL; | |
1264 | else if (width == 1) | |
1265 | tlw = LANE_ADP_CS_1_TARGET_WIDTH_SINGLE; | |
1266 | else | |
1267 | return -EINVAL; | |
1268 | ||
1269 | /* Use the current target speed */ | |
1270 | ret = tb_port_read(port, &val, TB_CFG_PORT, port->cap_phy + LANE_ADP_CS_1, 1); | |
1271 | if (ret) | |
1272 | return ret; | |
1273 | tls = val & LANE_ADP_CS_1_TARGET_SPEED_MASK; | |
1274 | ||
1275 | dev_dbg(&xd->dev, "sending link state change request with width %#x speed %#x\n", | |
1276 | tlw, tls); | |
1277 | ||
1278 | ret = tb_xdp_link_state_change_request(tb->ctl, xd->route, | |
1279 | xd->state_retries, tlw, tls); | |
1280 | if (ret) { | |
1281 | if (ret != -EOPNOTSUPP && xd->state_retries-- > 0) { | |
1282 | dev_dbg(&xd->dev, | |
1283 | "failed to change remote link state, retrying\n"); | |
1284 | return -EAGAIN; | |
1285 | } | |
1286 | dev_err(&xd->dev, "failed request link state change, aborting\n"); | |
1287 | return ret; | |
1288 | } | |
1289 | ||
1290 | dev_dbg(&xd->dev, "received link state change response\n"); | |
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | static int tb_xdomain_bond_lanes_uuid_high(struct tb_xdomain *xd) | |
1295 | { | |
1296 | struct tb_port *port; | |
1297 | int ret, width; | |
1298 | ||
1299 | if (xd->target_link_width == LANE_ADP_CS_1_TARGET_WIDTH_SINGLE) { | |
1300 | width = 1; | |
1301 | } else if (xd->target_link_width == LANE_ADP_CS_1_TARGET_WIDTH_DUAL) { | |
1302 | width = 2; | |
1303 | } else { | |
1304 | if (xd->state_retries-- > 0) { | |
1305 | dev_dbg(&xd->dev, | |
1306 | "link state change request not received yet, retrying\n"); | |
1307 | return -EAGAIN; | |
1308 | } | |
1309 | dev_dbg(&xd->dev, "timeout waiting for link change request\n"); | |
1310 | return -ETIMEDOUT; | |
1311 | } | |
1312 | ||
1313 | port = tb_port_at(xd->route, tb_xdomain_parent(xd)); | |
1314 | ||
1315 | /* | |
1316 | * We can't use tb_xdomain_lane_bonding_enable() here because it | |
1317 | * is the other side that initiates lane bonding. So here we | |
1318 | * just set the width to both lane adapters and wait for the | |
1319 | * link to transition bonded. | |
1320 | */ | |
1321 | ret = tb_port_set_link_width(port->dual_link_port, width); | |
1322 | if (ret) { | |
1323 | tb_port_warn(port->dual_link_port, | |
1324 | "failed to set link width to %d\n", width); | |
1325 | return ret; | |
1326 | } | |
1327 | ||
1328 | ret = tb_port_set_link_width(port, width); | |
1329 | if (ret) { | |
1330 | tb_port_warn(port, "failed to set link width to %d\n", width); | |
1331 | return ret; | |
1332 | } | |
1333 | ||
1334 | ret = tb_port_wait_for_link_width(port, width, XDOMAIN_BONDING_TIMEOUT); | |
1335 | if (ret) { | |
1336 | dev_warn(&xd->dev, "error waiting for link width to become %d\n", | |
1337 | width); | |
1338 | return ret; | |
1339 | } | |
1340 | ||
1341 | port->bonded = width == 2; | |
1342 | port->dual_link_port->bonded = width == 2; | |
1343 | ||
1344 | tb_port_update_credits(port); | |
1345 | tb_xdomain_update_link_attributes(xd); | |
1346 | ||
1347 | dev_dbg(&xd->dev, "lane bonding %sabled\n", width == 2 ? "en" : "dis"); | |
1348 | return 0; | |
1349 | } | |
1350 | ||
1351 | static int tb_xdomain_get_properties(struct tb_xdomain *xd) | |
d1ff7024 | 1352 | { |
d1ff7024 MW |
1353 | struct tb_property_dir *dir; |
1354 | struct tb *tb = xd->tb; | |
1355 | bool update = false; | |
1356 | u32 *block = NULL; | |
1357 | u32 gen = 0; | |
1358 | int ret; | |
1359 | ||
d29c59b1 MW |
1360 | dev_dbg(&xd->dev, "requesting remote properties\n"); |
1361 | ||
d1ff7024 | 1362 | ret = tb_xdp_properties_request(tb->ctl, xd->route, xd->local_uuid, |
8e1de704 | 1363 | xd->remote_uuid, xd->state_retries, |
d1ff7024 MW |
1364 | &block, &gen); |
1365 | if (ret < 0) { | |
8e1de704 | 1366 | if (xd->state_retries-- > 0) { |
d29c59b1 MW |
1367 | dev_dbg(&xd->dev, |
1368 | "failed to request remote properties, retrying\n"); | |
8e1de704 | 1369 | return -EAGAIN; |
d1ff7024 MW |
1370 | } else { |
1371 | /* Give up now */ | |
1372 | dev_err(&xd->dev, | |
1373 | "failed read XDomain properties from %pUb\n", | |
1374 | xd->remote_uuid); | |
1375 | } | |
d1ff7024 | 1376 | |
8e1de704 MW |
1377 | return ret; |
1378 | } | |
d1ff7024 MW |
1379 | |
1380 | mutex_lock(&xd->lock); | |
1381 | ||
1382 | /* Only accept newer generation properties */ | |
8e1de704 MW |
1383 | if (xd->remote_properties && gen <= xd->remote_property_block_gen) { |
1384 | ret = 0; | |
d1ff7024 | 1385 | goto err_free_block; |
8e1de704 | 1386 | } |
d1ff7024 MW |
1387 | |
1388 | dir = tb_property_parse_dir(block, ret); | |
1389 | if (!dir) { | |
1390 | dev_err(&xd->dev, "failed to parse XDomain properties\n"); | |
8e1de704 | 1391 | ret = -ENOMEM; |
d1ff7024 MW |
1392 | goto err_free_block; |
1393 | } | |
1394 | ||
1395 | ret = populate_properties(xd, dir); | |
1396 | if (ret) { | |
1397 | dev_err(&xd->dev, "missing XDomain properties in response\n"); | |
1398 | goto err_free_dir; | |
1399 | } | |
1400 | ||
1401 | /* Release the existing one */ | |
46b494f2 MW |
1402 | if (xd->remote_properties) { |
1403 | tb_property_free_dir(xd->remote_properties); | |
d1ff7024 MW |
1404 | update = true; |
1405 | } | |
1406 | ||
46b494f2 MW |
1407 | xd->remote_properties = dir; |
1408 | xd->remote_property_block_gen = gen; | |
d1ff7024 | 1409 | |
4210d50f IH |
1410 | tb_xdomain_update_link_attributes(xd); |
1411 | ||
d1ff7024 MW |
1412 | mutex_unlock(&xd->lock); |
1413 | ||
1414 | kfree(block); | |
1415 | ||
1416 | /* | |
1417 | * Now the device should be ready enough so we can add it to the | |
1418 | * bus and let userspace know about it. If the device is already | |
1419 | * registered, we notify the userspace that it has changed. | |
1420 | */ | |
1421 | if (!update) { | |
8e1de704 MW |
1422 | struct tb_port *port; |
1423 | ||
1424 | /* Now disable lane 1 if bonding was not enabled */ | |
1425 | port = tb_port_at(xd->route, tb_xdomain_parent(xd)); | |
1426 | if (!port->bonded) | |
1427 | tb_port_disable(port->dual_link_port); | |
1428 | ||
d1ff7024 MW |
1429 | if (device_add(&xd->dev)) { |
1430 | dev_err(&xd->dev, "failed to add XDomain device\n"); | |
8e1de704 | 1431 | return -ENODEV; |
d1ff7024 | 1432 | } |
d29c59b1 MW |
1433 | dev_info(&xd->dev, "new host found, vendor=%#x device=%#x\n", |
1434 | xd->vendor, xd->device); | |
1435 | if (xd->vendor_name && xd->device_name) | |
1436 | dev_info(&xd->dev, "%s %s\n", xd->vendor_name, | |
1437 | xd->device_name); | |
d0f1e0c2 MW |
1438 | |
1439 | tb_xdomain_debugfs_init(xd); | |
d1ff7024 MW |
1440 | } else { |
1441 | kobject_uevent(&xd->dev.kobj, KOBJ_CHANGE); | |
1442 | } | |
1443 | ||
1444 | enumerate_services(xd); | |
8e1de704 | 1445 | return 0; |
d1ff7024 MW |
1446 | |
1447 | err_free_dir: | |
1448 | tb_property_free_dir(dir); | |
1449 | err_free_block: | |
1450 | kfree(block); | |
1451 | mutex_unlock(&xd->lock); | |
8e1de704 MW |
1452 | |
1453 | return ret; | |
1454 | } | |
1455 | ||
1456 | static void tb_xdomain_queue_uuid(struct tb_xdomain *xd) | |
1457 | { | |
1458 | xd->state = XDOMAIN_STATE_UUID; | |
1459 | xd->state_retries = XDOMAIN_RETRIES; | |
1460 | queue_delayed_work(xd->tb->wq, &xd->state_work, | |
1461 | msecs_to_jiffies(XDOMAIN_SHORT_TIMEOUT)); | |
1462 | } | |
1463 | ||
1464 | static void tb_xdomain_queue_link_status(struct tb_xdomain *xd) | |
1465 | { | |
1466 | xd->state = XDOMAIN_STATE_LINK_STATUS; | |
1467 | xd->state_retries = XDOMAIN_RETRIES; | |
1468 | queue_delayed_work(xd->tb->wq, &xd->state_work, | |
1469 | msecs_to_jiffies(XDOMAIN_DEFAULT_TIMEOUT)); | |
1470 | } | |
1471 | ||
1472 | static void tb_xdomain_queue_link_status2(struct tb_xdomain *xd) | |
1473 | { | |
1474 | xd->state = XDOMAIN_STATE_LINK_STATUS2; | |
1475 | xd->state_retries = XDOMAIN_RETRIES; | |
1476 | queue_delayed_work(xd->tb->wq, &xd->state_work, | |
1477 | msecs_to_jiffies(XDOMAIN_DEFAULT_TIMEOUT)); | |
1478 | } | |
1479 | ||
1480 | static void tb_xdomain_queue_bonding(struct tb_xdomain *xd) | |
1481 | { | |
1482 | if (memcmp(xd->local_uuid, xd->remote_uuid, UUID_SIZE) > 0) { | |
1483 | dev_dbg(&xd->dev, "we have higher UUID, other side bonds the lanes\n"); | |
1484 | xd->state = XDOMAIN_STATE_BONDING_UUID_HIGH; | |
1485 | } else { | |
1486 | dev_dbg(&xd->dev, "we have lower UUID, bonding lanes\n"); | |
1487 | xd->state = XDOMAIN_STATE_LINK_STATE_CHANGE; | |
1488 | } | |
1489 | ||
1490 | xd->state_retries = XDOMAIN_RETRIES; | |
1491 | queue_delayed_work(xd->tb->wq, &xd->state_work, | |
1492 | msecs_to_jiffies(XDOMAIN_DEFAULT_TIMEOUT)); | |
1493 | } | |
1494 | ||
1495 | static void tb_xdomain_queue_bonding_uuid_low(struct tb_xdomain *xd) | |
1496 | { | |
1497 | xd->state = XDOMAIN_STATE_BONDING_UUID_LOW; | |
1498 | xd->state_retries = XDOMAIN_RETRIES; | |
1499 | queue_delayed_work(xd->tb->wq, &xd->state_work, | |
1500 | msecs_to_jiffies(XDOMAIN_DEFAULT_TIMEOUT)); | |
1501 | } | |
1502 | ||
1503 | static void tb_xdomain_queue_properties(struct tb_xdomain *xd) | |
1504 | { | |
1505 | xd->state = XDOMAIN_STATE_PROPERTIES; | |
1506 | xd->state_retries = XDOMAIN_RETRIES; | |
1507 | queue_delayed_work(xd->tb->wq, &xd->state_work, | |
1508 | msecs_to_jiffies(XDOMAIN_DEFAULT_TIMEOUT)); | |
1509 | } | |
1510 | ||
1511 | static void tb_xdomain_queue_properties_changed(struct tb_xdomain *xd) | |
1512 | { | |
1513 | xd->properties_changed_retries = XDOMAIN_RETRIES; | |
1514 | queue_delayed_work(xd->tb->wq, &xd->properties_changed_work, | |
1515 | msecs_to_jiffies(XDOMAIN_SHORT_TIMEOUT)); | |
1516 | } | |
1517 | ||
1518 | static void tb_xdomain_state_work(struct work_struct *work) | |
1519 | { | |
1520 | struct tb_xdomain *xd = container_of(work, typeof(*xd), state_work.work); | |
1521 | int ret, state = xd->state; | |
1522 | ||
1523 | if (WARN_ON_ONCE(state < XDOMAIN_STATE_INIT || | |
1524 | state > XDOMAIN_STATE_ERROR)) | |
1525 | return; | |
1526 | ||
1527 | dev_dbg(&xd->dev, "running state %s\n", state_names[state]); | |
1528 | ||
1529 | switch (state) { | |
1530 | case XDOMAIN_STATE_INIT: | |
1531 | if (xd->needs_uuid) { | |
1532 | tb_xdomain_queue_uuid(xd); | |
1533 | } else { | |
1534 | tb_xdomain_queue_properties_changed(xd); | |
1535 | tb_xdomain_queue_properties(xd); | |
1536 | } | |
1537 | break; | |
1538 | ||
1539 | case XDOMAIN_STATE_UUID: | |
1540 | ret = tb_xdomain_get_uuid(xd); | |
1541 | if (ret) { | |
1542 | if (ret == -EAGAIN) | |
1543 | goto retry_state; | |
1544 | xd->state = XDOMAIN_STATE_ERROR; | |
1545 | } else { | |
1546 | tb_xdomain_queue_properties_changed(xd); | |
1547 | if (xd->bonding_possible) | |
1548 | tb_xdomain_queue_link_status(xd); | |
1549 | else | |
1550 | tb_xdomain_queue_properties(xd); | |
1551 | } | |
1552 | break; | |
1553 | ||
1554 | case XDOMAIN_STATE_LINK_STATUS: | |
1555 | ret = tb_xdomain_get_link_status(xd); | |
1556 | if (ret) { | |
1557 | if (ret == -EAGAIN) | |
1558 | goto retry_state; | |
1559 | ||
1560 | /* | |
1561 | * If any of the lane bonding states fail we skip | |
1562 | * bonding completely and try to continue from | |
1563 | * reading properties. | |
1564 | */ | |
1565 | tb_xdomain_queue_properties(xd); | |
1566 | } else { | |
1567 | tb_xdomain_queue_bonding(xd); | |
1568 | } | |
1569 | break; | |
1570 | ||
1571 | case XDOMAIN_STATE_LINK_STATE_CHANGE: | |
1572 | ret = tb_xdomain_link_state_change(xd, 2); | |
1573 | if (ret) { | |
1574 | if (ret == -EAGAIN) | |
1575 | goto retry_state; | |
1576 | tb_xdomain_queue_properties(xd); | |
1577 | } else { | |
1578 | tb_xdomain_queue_link_status2(xd); | |
1579 | } | |
1580 | break; | |
1581 | ||
1582 | case XDOMAIN_STATE_LINK_STATUS2: | |
1583 | ret = tb_xdomain_get_link_status(xd); | |
1584 | if (ret) { | |
1585 | if (ret == -EAGAIN) | |
1586 | goto retry_state; | |
1587 | tb_xdomain_queue_properties(xd); | |
1588 | } else { | |
1589 | tb_xdomain_queue_bonding_uuid_low(xd); | |
1590 | } | |
1591 | break; | |
1592 | ||
1593 | case XDOMAIN_STATE_BONDING_UUID_LOW: | |
1594 | tb_xdomain_lane_bonding_enable(xd); | |
1595 | tb_xdomain_queue_properties(xd); | |
1596 | break; | |
1597 | ||
1598 | case XDOMAIN_STATE_BONDING_UUID_HIGH: | |
1599 | if (tb_xdomain_bond_lanes_uuid_high(xd) == -EAGAIN) | |
1600 | goto retry_state; | |
1601 | tb_xdomain_queue_properties(xd); | |
1602 | break; | |
1603 | ||
1604 | case XDOMAIN_STATE_PROPERTIES: | |
1605 | ret = tb_xdomain_get_properties(xd); | |
1606 | if (ret) { | |
1607 | if (ret == -EAGAIN) | |
1608 | goto retry_state; | |
1609 | xd->state = XDOMAIN_STATE_ERROR; | |
1610 | } else { | |
1611 | xd->state = XDOMAIN_STATE_ENUMERATED; | |
1612 | } | |
1613 | break; | |
1614 | ||
1615 | case XDOMAIN_STATE_ENUMERATED: | |
1616 | tb_xdomain_queue_properties(xd); | |
1617 | break; | |
1618 | ||
1619 | case XDOMAIN_STATE_ERROR: | |
1620 | break; | |
1621 | ||
1622 | default: | |
1623 | dev_warn(&xd->dev, "unexpected state %d\n", state); | |
1624 | break; | |
1625 | } | |
1626 | ||
1627 | return; | |
1628 | ||
1629 | retry_state: | |
1630 | queue_delayed_work(xd->tb->wq, &xd->state_work, | |
1631 | msecs_to_jiffies(XDOMAIN_DEFAULT_TIMEOUT)); | |
d1ff7024 MW |
1632 | } |
1633 | ||
1634 | static void tb_xdomain_properties_changed(struct work_struct *work) | |
1635 | { | |
1636 | struct tb_xdomain *xd = container_of(work, typeof(*xd), | |
1637 | properties_changed_work.work); | |
1638 | int ret; | |
1639 | ||
d29c59b1 MW |
1640 | dev_dbg(&xd->dev, "sending properties changed notification\n"); |
1641 | ||
d1ff7024 MW |
1642 | ret = tb_xdp_properties_changed_request(xd->tb->ctl, xd->route, |
1643 | xd->properties_changed_retries, xd->local_uuid); | |
1644 | if (ret) { | |
d29c59b1 MW |
1645 | if (xd->properties_changed_retries-- > 0) { |
1646 | dev_dbg(&xd->dev, | |
1647 | "failed to send properties changed notification, retrying\n"); | |
d1ff7024 MW |
1648 | queue_delayed_work(xd->tb->wq, |
1649 | &xd->properties_changed_work, | |
8e1de704 | 1650 | msecs_to_jiffies(XDOMAIN_DEFAULT_TIMEOUT)); |
d29c59b1 MW |
1651 | } |
1652 | dev_err(&xd->dev, "failed to send properties changed notification\n"); | |
d1ff7024 MW |
1653 | return; |
1654 | } | |
1655 | ||
8e1de704 | 1656 | xd->properties_changed_retries = XDOMAIN_RETRIES; |
d1ff7024 MW |
1657 | } |
1658 | ||
1659 | static ssize_t device_show(struct device *dev, struct device_attribute *attr, | |
1660 | char *buf) | |
1661 | { | |
1662 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1663 | ||
8283fb57 | 1664 | return sysfs_emit(buf, "%#x\n", xd->device); |
d1ff7024 MW |
1665 | } |
1666 | static DEVICE_ATTR_RO(device); | |
1667 | ||
1668 | static ssize_t | |
1669 | device_name_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1670 | { | |
1671 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1672 | int ret; | |
1673 | ||
1674 | if (mutex_lock_interruptible(&xd->lock)) | |
1675 | return -ERESTARTSYS; | |
8283fb57 | 1676 | ret = sysfs_emit(buf, "%s\n", xd->device_name ?: ""); |
d1ff7024 MW |
1677 | mutex_unlock(&xd->lock); |
1678 | ||
1679 | return ret; | |
1680 | } | |
1681 | static DEVICE_ATTR_RO(device_name); | |
1682 | ||
46b494f2 MW |
1683 | static ssize_t maxhopid_show(struct device *dev, struct device_attribute *attr, |
1684 | char *buf) | |
1685 | { | |
1686 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1687 | ||
8283fb57 | 1688 | return sysfs_emit(buf, "%d\n", xd->remote_max_hopid); |
46b494f2 MW |
1689 | } |
1690 | static DEVICE_ATTR_RO(maxhopid); | |
1691 | ||
d1ff7024 MW |
1692 | static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, |
1693 | char *buf) | |
1694 | { | |
1695 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1696 | ||
8283fb57 | 1697 | return sysfs_emit(buf, "%#x\n", xd->vendor); |
d1ff7024 MW |
1698 | } |
1699 | static DEVICE_ATTR_RO(vendor); | |
1700 | ||
1701 | static ssize_t | |
1702 | vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1703 | { | |
1704 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1705 | int ret; | |
1706 | ||
1707 | if (mutex_lock_interruptible(&xd->lock)) | |
1708 | return -ERESTARTSYS; | |
8283fb57 | 1709 | ret = sysfs_emit(buf, "%s\n", xd->vendor_name ?: ""); |
d1ff7024 MW |
1710 | mutex_unlock(&xd->lock); |
1711 | ||
1712 | return ret; | |
1713 | } | |
1714 | static DEVICE_ATTR_RO(vendor_name); | |
1715 | ||
1716 | static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr, | |
1717 | char *buf) | |
1718 | { | |
1719 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1720 | ||
8283fb57 | 1721 | return sysfs_emit(buf, "%pUb\n", xd->remote_uuid); |
d1ff7024 MW |
1722 | } |
1723 | static DEVICE_ATTR_RO(unique_id); | |
1724 | ||
4210d50f IH |
1725 | static ssize_t speed_show(struct device *dev, struct device_attribute *attr, |
1726 | char *buf) | |
1727 | { | |
1728 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1729 | ||
8283fb57 | 1730 | return sysfs_emit(buf, "%u.0 Gb/s\n", xd->link_speed); |
4210d50f IH |
1731 | } |
1732 | ||
1733 | static DEVICE_ATTR(rx_speed, 0444, speed_show, NULL); | |
1734 | static DEVICE_ATTR(tx_speed, 0444, speed_show, NULL); | |
1735 | ||
1736 | static ssize_t lanes_show(struct device *dev, struct device_attribute *attr, | |
1737 | char *buf) | |
1738 | { | |
1739 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1740 | ||
8283fb57 | 1741 | return sysfs_emit(buf, "%u\n", xd->link_width); |
4210d50f IH |
1742 | } |
1743 | ||
1744 | static DEVICE_ATTR(rx_lanes, 0444, lanes_show, NULL); | |
1745 | static DEVICE_ATTR(tx_lanes, 0444, lanes_show, NULL); | |
1746 | ||
d1ff7024 MW |
1747 | static struct attribute *xdomain_attrs[] = { |
1748 | &dev_attr_device.attr, | |
1749 | &dev_attr_device_name.attr, | |
46b494f2 | 1750 | &dev_attr_maxhopid.attr, |
4210d50f IH |
1751 | &dev_attr_rx_lanes.attr, |
1752 | &dev_attr_rx_speed.attr, | |
1753 | &dev_attr_tx_lanes.attr, | |
1754 | &dev_attr_tx_speed.attr, | |
d1ff7024 MW |
1755 | &dev_attr_unique_id.attr, |
1756 | &dev_attr_vendor.attr, | |
1757 | &dev_attr_vendor_name.attr, | |
1758 | NULL, | |
1759 | }; | |
1760 | ||
6889e00f | 1761 | static const struct attribute_group xdomain_attr_group = { |
d1ff7024 MW |
1762 | .attrs = xdomain_attrs, |
1763 | }; | |
1764 | ||
1765 | static const struct attribute_group *xdomain_attr_groups[] = { | |
1766 | &xdomain_attr_group, | |
1767 | NULL, | |
1768 | }; | |
1769 | ||
1770 | static void tb_xdomain_release(struct device *dev) | |
1771 | { | |
1772 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1773 | ||
1774 | put_device(xd->dev.parent); | |
1775 | ||
46b494f2 MW |
1776 | kfree(xd->local_property_block); |
1777 | tb_property_free_dir(xd->remote_properties); | |
180b0689 MW |
1778 | ida_destroy(&xd->out_hopids); |
1779 | ida_destroy(&xd->in_hopids); | |
d1ff7024 MW |
1780 | ida_destroy(&xd->service_ids); |
1781 | ||
1782 | kfree(xd->local_uuid); | |
1783 | kfree(xd->remote_uuid); | |
1784 | kfree(xd->device_name); | |
1785 | kfree(xd->vendor_name); | |
1786 | kfree(xd); | |
1787 | } | |
1788 | ||
1789 | static void start_handshake(struct tb_xdomain *xd) | |
1790 | { | |
8e1de704 MW |
1791 | xd->state = XDOMAIN_STATE_INIT; |
1792 | queue_delayed_work(xd->tb->wq, &xd->state_work, | |
1793 | msecs_to_jiffies(XDOMAIN_SHORT_TIMEOUT)); | |
d1ff7024 MW |
1794 | } |
1795 | ||
1796 | static void stop_handshake(struct tb_xdomain *xd) | |
1797 | { | |
d1ff7024 | 1798 | cancel_delayed_work_sync(&xd->properties_changed_work); |
8e1de704 MW |
1799 | cancel_delayed_work_sync(&xd->state_work); |
1800 | xd->properties_changed_retries = 0; | |
1801 | xd->state_retries = 0; | |
d1ff7024 MW |
1802 | } |
1803 | ||
1804 | static int __maybe_unused tb_xdomain_suspend(struct device *dev) | |
1805 | { | |
1806 | stop_handshake(tb_to_xdomain(dev)); | |
1807 | return 0; | |
1808 | } | |
1809 | ||
1810 | static int __maybe_unused tb_xdomain_resume(struct device *dev) | |
1811 | { | |
8ccbed24 | 1812 | start_handshake(tb_to_xdomain(dev)); |
d1ff7024 MW |
1813 | return 0; |
1814 | } | |
1815 | ||
1816 | static const struct dev_pm_ops tb_xdomain_pm_ops = { | |
1817 | SET_SYSTEM_SLEEP_PM_OPS(tb_xdomain_suspend, tb_xdomain_resume) | |
1818 | }; | |
1819 | ||
1820 | struct device_type tb_xdomain_type = { | |
1821 | .name = "thunderbolt_xdomain", | |
1822 | .release = tb_xdomain_release, | |
1823 | .pm = &tb_xdomain_pm_ops, | |
1824 | }; | |
1825 | EXPORT_SYMBOL_GPL(tb_xdomain_type); | |
1826 | ||
1827 | /** | |
1828 | * tb_xdomain_alloc() - Allocate new XDomain object | |
1829 | * @tb: Domain where the XDomain belongs | |
1830 | * @parent: Parent device (the switch through the connection to the | |
1831 | * other domain is reached). | |
1832 | * @route: Route string used to reach the other domain | |
1833 | * @local_uuid: Our local domain UUID | |
3b4b3235 | 1834 | * @remote_uuid: UUID of the other domain (optional) |
d1ff7024 MW |
1835 | * |
1836 | * Allocates new XDomain structure and returns pointer to that. The | |
1837 | * object must be released by calling tb_xdomain_put(). | |
1838 | */ | |
1839 | struct tb_xdomain *tb_xdomain_alloc(struct tb *tb, struct device *parent, | |
1840 | u64 route, const uuid_t *local_uuid, | |
1841 | const uuid_t *remote_uuid) | |
1842 | { | |
b0407983 | 1843 | struct tb_switch *parent_sw = tb_to_switch(parent); |
d1ff7024 | 1844 | struct tb_xdomain *xd; |
b0407983 MW |
1845 | struct tb_port *down; |
1846 | ||
1847 | /* Make sure the downstream domain is accessible */ | |
1848 | down = tb_port_at(route, parent_sw); | |
1849 | tb_port_unlock(down); | |
d1ff7024 MW |
1850 | |
1851 | xd = kzalloc(sizeof(*xd), GFP_KERNEL); | |
1852 | if (!xd) | |
1853 | return NULL; | |
1854 | ||
1855 | xd->tb = tb; | |
1856 | xd->route = route; | |
46b494f2 | 1857 | xd->local_max_hopid = down->config.max_in_hop_id; |
d1ff7024 | 1858 | ida_init(&xd->service_ids); |
180b0689 MW |
1859 | ida_init(&xd->in_hopids); |
1860 | ida_init(&xd->out_hopids); | |
d1ff7024 | 1861 | mutex_init(&xd->lock); |
8e1de704 | 1862 | INIT_DELAYED_WORK(&xd->state_work, tb_xdomain_state_work); |
d1ff7024 MW |
1863 | INIT_DELAYED_WORK(&xd->properties_changed_work, |
1864 | tb_xdomain_properties_changed); | |
1865 | ||
1866 | xd->local_uuid = kmemdup(local_uuid, sizeof(uuid_t), GFP_KERNEL); | |
1867 | if (!xd->local_uuid) | |
1868 | goto err_free; | |
1869 | ||
3b4b3235 MW |
1870 | if (remote_uuid) { |
1871 | xd->remote_uuid = kmemdup(remote_uuid, sizeof(uuid_t), | |
1872 | GFP_KERNEL); | |
1873 | if (!xd->remote_uuid) | |
1874 | goto err_free_local_uuid; | |
1875 | } else { | |
1876 | xd->needs_uuid = true; | |
8e1de704 | 1877 | xd->bonding_possible = !!down->dual_link_port; |
3b4b3235 | 1878 | } |
d1ff7024 MW |
1879 | |
1880 | device_initialize(&xd->dev); | |
1881 | xd->dev.parent = get_device(parent); | |
1882 | xd->dev.bus = &tb_bus_type; | |
1883 | xd->dev.type = &tb_xdomain_type; | |
1884 | xd->dev.groups = xdomain_attr_groups; | |
1885 | dev_set_name(&xd->dev, "%u-%llx", tb->index, route); | |
1886 | ||
d29c59b1 MW |
1887 | dev_dbg(&xd->dev, "local UUID %pUb\n", local_uuid); |
1888 | if (remote_uuid) | |
1889 | dev_dbg(&xd->dev, "remote UUID %pUb\n", remote_uuid); | |
1890 | ||
2d8ff0b5 MW |
1891 | /* |
1892 | * This keeps the DMA powered on as long as we have active | |
1893 | * connection to another host. | |
1894 | */ | |
1895 | pm_runtime_set_active(&xd->dev); | |
1896 | pm_runtime_get_noresume(&xd->dev); | |
1897 | pm_runtime_enable(&xd->dev); | |
1898 | ||
d1ff7024 MW |
1899 | return xd; |
1900 | ||
1901 | err_free_local_uuid: | |
1902 | kfree(xd->local_uuid); | |
1903 | err_free: | |
1904 | kfree(xd); | |
1905 | ||
1906 | return NULL; | |
1907 | } | |
1908 | ||
1909 | /** | |
1910 | * tb_xdomain_add() - Add XDomain to the bus | |
1911 | * @xd: XDomain to add | |
1912 | * | |
1913 | * This function starts XDomain discovery protocol handshake and | |
1914 | * eventually adds the XDomain to the bus. After calling this function | |
1915 | * the caller needs to call tb_xdomain_remove() in order to remove and | |
1916 | * release the object regardless whether the handshake succeeded or not. | |
1917 | */ | |
1918 | void tb_xdomain_add(struct tb_xdomain *xd) | |
1919 | { | |
1920 | /* Start exchanging properties with the other host */ | |
1921 | start_handshake(xd); | |
1922 | } | |
1923 | ||
1924 | static int unregister_service(struct device *dev, void *data) | |
1925 | { | |
1926 | device_unregister(dev); | |
1927 | return 0; | |
1928 | } | |
1929 | ||
1930 | /** | |
1931 | * tb_xdomain_remove() - Remove XDomain from the bus | |
1932 | * @xd: XDomain to remove | |
1933 | * | |
1934 | * This will stop all ongoing configuration work and remove the XDomain | |
1935 | * along with any services from the bus. When the last reference to @xd | |
1936 | * is released the object will be released as well. | |
1937 | */ | |
1938 | void tb_xdomain_remove(struct tb_xdomain *xd) | |
1939 | { | |
d0f1e0c2 MW |
1940 | tb_xdomain_debugfs_remove(xd); |
1941 | ||
d1ff7024 MW |
1942 | stop_handshake(xd); |
1943 | ||
1944 | device_for_each_child_reverse(&xd->dev, xd, unregister_service); | |
1945 | ||
2d8ff0b5 MW |
1946 | /* |
1947 | * Undo runtime PM here explicitly because it is possible that | |
1948 | * the XDomain was never added to the bus and thus device_del() | |
1949 | * is not called for it (device_del() would handle this otherwise). | |
1950 | */ | |
1951 | pm_runtime_disable(&xd->dev); | |
1952 | pm_runtime_put_noidle(&xd->dev); | |
1953 | pm_runtime_set_suspended(&xd->dev); | |
1954 | ||
d29c59b1 | 1955 | if (!device_is_registered(&xd->dev)) { |
d1ff7024 | 1956 | put_device(&xd->dev); |
d29c59b1 MW |
1957 | } else { |
1958 | dev_info(&xd->dev, "host disconnected\n"); | |
d1ff7024 | 1959 | device_unregister(&xd->dev); |
d29c59b1 | 1960 | } |
d1ff7024 MW |
1961 | } |
1962 | ||
5cc0df9c IH |
1963 | /** |
1964 | * tb_xdomain_lane_bonding_enable() - Enable lane bonding on XDomain | |
1965 | * @xd: XDomain connection | |
1966 | * | |
1967 | * Lane bonding is disabled by default for XDomains. This function tries | |
1968 | * to enable bonding by first enabling the port and waiting for the CL0 | |
1969 | * state. | |
1970 | * | |
1971 | * Return: %0 in case of success and negative errno in case of error. | |
1972 | */ | |
1973 | int tb_xdomain_lane_bonding_enable(struct tb_xdomain *xd) | |
1974 | { | |
1975 | struct tb_port *port; | |
1976 | int ret; | |
1977 | ||
1978 | port = tb_port_at(xd->route, tb_xdomain_parent(xd)); | |
1979 | if (!port->dual_link_port) | |
1980 | return -ENODEV; | |
1981 | ||
1982 | ret = tb_port_enable(port->dual_link_port); | |
1983 | if (ret) | |
1984 | return ret; | |
1985 | ||
1986 | ret = tb_wait_for_port(port->dual_link_port, true); | |
1987 | if (ret < 0) | |
1988 | return ret; | |
1989 | if (!ret) | |
1990 | return -ENOTCONN; | |
1991 | ||
1992 | ret = tb_port_lane_bonding_enable(port); | |
1993 | if (ret) { | |
1994 | tb_port_warn(port, "failed to enable lane bonding\n"); | |
1995 | return ret; | |
1996 | } | |
1997 | ||
8e1de704 | 1998 | ret = tb_port_wait_for_link_width(port, 2, XDOMAIN_BONDING_TIMEOUT); |
e7051bea | 1999 | if (ret) { |
8e1de704 | 2000 | tb_port_warn(port, "failed to enable lane bonding\n"); |
e7051bea MW |
2001 | return ret; |
2002 | } | |
2003 | ||
69fea377 | 2004 | tb_port_update_credits(port); |
5cc0df9c IH |
2005 | tb_xdomain_update_link_attributes(xd); |
2006 | ||
2007 | dev_dbg(&xd->dev, "lane bonding enabled\n"); | |
2008 | return 0; | |
2009 | } | |
2010 | EXPORT_SYMBOL_GPL(tb_xdomain_lane_bonding_enable); | |
2011 | ||
2012 | /** | |
2013 | * tb_xdomain_lane_bonding_disable() - Disable lane bonding | |
2014 | * @xd: XDomain connection | |
2015 | * | |
2016 | * Lane bonding is disabled by default for XDomains. If bonding has been | |
2017 | * enabled, this function can be used to disable it. | |
2018 | */ | |
2019 | void tb_xdomain_lane_bonding_disable(struct tb_xdomain *xd) | |
2020 | { | |
2021 | struct tb_port *port; | |
2022 | ||
2023 | port = tb_port_at(xd->route, tb_xdomain_parent(xd)); | |
2024 | if (port->dual_link_port) { | |
2025 | tb_port_lane_bonding_disable(port); | |
e7051bea MW |
2026 | if (tb_port_wait_for_link_width(port, 1, 100) == -ETIMEDOUT) |
2027 | tb_port_warn(port, "timeout disabling lane bonding\n"); | |
5cc0df9c | 2028 | tb_port_disable(port->dual_link_port); |
69fea377 | 2029 | tb_port_update_credits(port); |
5cc0df9c IH |
2030 | tb_xdomain_update_link_attributes(xd); |
2031 | ||
2032 | dev_dbg(&xd->dev, "lane bonding disabled\n"); | |
2033 | } | |
2034 | } | |
2035 | EXPORT_SYMBOL_GPL(tb_xdomain_lane_bonding_disable); | |
2036 | ||
d1ff7024 | 2037 | /** |
180b0689 | 2038 | * tb_xdomain_alloc_in_hopid() - Allocate input HopID for tunneling |
d1ff7024 | 2039 | * @xd: XDomain connection |
180b0689 | 2040 | * @hopid: Preferred HopID or %-1 for next available |
d1ff7024 | 2041 | * |
180b0689 MW |
2042 | * Returns allocated HopID or negative errno. Specifically returns |
2043 | * %-ENOSPC if there are no more available HopIDs. Returned HopID is | |
2044 | * guaranteed to be within range supported by the input lane adapter. | |
2045 | * Call tb_xdomain_release_in_hopid() to release the allocated HopID. | |
d1ff7024 | 2046 | */ |
180b0689 | 2047 | int tb_xdomain_alloc_in_hopid(struct tb_xdomain *xd, int hopid) |
d1ff7024 | 2048 | { |
180b0689 MW |
2049 | if (hopid < 0) |
2050 | hopid = TB_PATH_MIN_HOPID; | |
2051 | if (hopid < TB_PATH_MIN_HOPID || hopid > xd->local_max_hopid) | |
2052 | return -EINVAL; | |
d1ff7024 | 2053 | |
180b0689 MW |
2054 | return ida_alloc_range(&xd->in_hopids, hopid, xd->local_max_hopid, |
2055 | GFP_KERNEL); | |
2056 | } | |
2057 | EXPORT_SYMBOL_GPL(tb_xdomain_alloc_in_hopid); | |
d1ff7024 | 2058 | |
180b0689 MW |
2059 | /** |
2060 | * tb_xdomain_alloc_out_hopid() - Allocate output HopID for tunneling | |
2061 | * @xd: XDomain connection | |
2062 | * @hopid: Preferred HopID or %-1 for next available | |
2063 | * | |
2064 | * Returns allocated HopID or negative errno. Specifically returns | |
2065 | * %-ENOSPC if there are no more available HopIDs. Returned HopID is | |
2066 | * guaranteed to be within range supported by the output lane adapter. | |
2067 | * Call tb_xdomain_release_in_hopid() to release the allocated HopID. | |
2068 | */ | |
2069 | int tb_xdomain_alloc_out_hopid(struct tb_xdomain *xd, int hopid) | |
2070 | { | |
2071 | if (hopid < 0) | |
2072 | hopid = TB_PATH_MIN_HOPID; | |
2073 | if (hopid < TB_PATH_MIN_HOPID || hopid > xd->remote_max_hopid) | |
2074 | return -EINVAL; | |
d1ff7024 | 2075 | |
180b0689 MW |
2076 | return ida_alloc_range(&xd->out_hopids, hopid, xd->remote_max_hopid, |
2077 | GFP_KERNEL); | |
2078 | } | |
2079 | EXPORT_SYMBOL_GPL(tb_xdomain_alloc_out_hopid); | |
d1ff7024 | 2080 | |
180b0689 MW |
2081 | /** |
2082 | * tb_xdomain_release_in_hopid() - Release input HopID | |
2083 | * @xd: XDomain connection | |
2084 | * @hopid: HopID to release | |
2085 | */ | |
2086 | void tb_xdomain_release_in_hopid(struct tb_xdomain *xd, int hopid) | |
2087 | { | |
2088 | ida_free(&xd->in_hopids, hopid); | |
2089 | } | |
2090 | EXPORT_SYMBOL_GPL(tb_xdomain_release_in_hopid); | |
d1ff7024 | 2091 | |
180b0689 MW |
2092 | /** |
2093 | * tb_xdomain_release_out_hopid() - Release output HopID | |
2094 | * @xd: XDomain connection | |
2095 | * @hopid: HopID to release | |
2096 | */ | |
2097 | void tb_xdomain_release_out_hopid(struct tb_xdomain *xd, int hopid) | |
2098 | { | |
2099 | ida_free(&xd->out_hopids, hopid); | |
2100 | } | |
2101 | EXPORT_SYMBOL_GPL(tb_xdomain_release_out_hopid); | |
d1ff7024 | 2102 | |
180b0689 MW |
2103 | /** |
2104 | * tb_xdomain_enable_paths() - Enable DMA paths for XDomain connection | |
2105 | * @xd: XDomain connection | |
2106 | * @transmit_path: HopID we are using to send out packets | |
2107 | * @transmit_ring: DMA ring used to send out packets | |
2108 | * @receive_path: HopID the other end is using to send packets to us | |
2109 | * @receive_ring: DMA ring used to receive packets from @receive_path | |
2110 | * | |
2111 | * The function enables DMA paths accordingly so that after successful | |
2112 | * return the caller can send and receive packets using high-speed DMA | |
2113 | * path. If a transmit or receive path is not needed, pass %-1 for those | |
2114 | * parameters. | |
2115 | * | |
2116 | * Return: %0 in case of success and negative errno in case of error | |
2117 | */ | |
2118 | int tb_xdomain_enable_paths(struct tb_xdomain *xd, int transmit_path, | |
2119 | int transmit_ring, int receive_path, | |
2120 | int receive_ring) | |
2121 | { | |
2122 | return tb_domain_approve_xdomain_paths(xd->tb, xd, transmit_path, | |
2123 | transmit_ring, receive_path, | |
2124 | receive_ring); | |
d1ff7024 MW |
2125 | } |
2126 | EXPORT_SYMBOL_GPL(tb_xdomain_enable_paths); | |
2127 | ||
2128 | /** | |
2129 | * tb_xdomain_disable_paths() - Disable DMA paths for XDomain connection | |
2130 | * @xd: XDomain connection | |
180b0689 MW |
2131 | * @transmit_path: HopID we are using to send out packets |
2132 | * @transmit_ring: DMA ring used to send out packets | |
2133 | * @receive_path: HopID the other end is using to send packets to us | |
2134 | * @receive_ring: DMA ring used to receive packets from @receive_path | |
d1ff7024 MW |
2135 | * |
2136 | * This does the opposite of tb_xdomain_enable_paths(). After call to | |
180b0689 MW |
2137 | * this the caller is not expected to use the rings anymore. Passing %-1 |
2138 | * as path/ring parameter means don't care. Normally the callers should | |
2139 | * pass the same values here as they do when paths are enabled. | |
d1ff7024 MW |
2140 | * |
2141 | * Return: %0 in case of success and negative errno in case of error | |
2142 | */ | |
180b0689 MW |
2143 | int tb_xdomain_disable_paths(struct tb_xdomain *xd, int transmit_path, |
2144 | int transmit_ring, int receive_path, | |
2145 | int receive_ring) | |
d1ff7024 | 2146 | { |
180b0689 MW |
2147 | return tb_domain_disconnect_xdomain_paths(xd->tb, xd, transmit_path, |
2148 | transmit_ring, receive_path, | |
2149 | receive_ring); | |
d1ff7024 MW |
2150 | } |
2151 | EXPORT_SYMBOL_GPL(tb_xdomain_disable_paths); | |
2152 | ||
2153 | struct tb_xdomain_lookup { | |
2154 | const uuid_t *uuid; | |
2155 | u8 link; | |
2156 | u8 depth; | |
484cb153 | 2157 | u64 route; |
d1ff7024 MW |
2158 | }; |
2159 | ||
2160 | static struct tb_xdomain *switch_find_xdomain(struct tb_switch *sw, | |
2161 | const struct tb_xdomain_lookup *lookup) | |
2162 | { | |
b433d010 | 2163 | struct tb_port *port; |
d1ff7024 | 2164 | |
b433d010 | 2165 | tb_switch_for_each_port(sw, port) { |
d1ff7024 MW |
2166 | struct tb_xdomain *xd; |
2167 | ||
d1ff7024 MW |
2168 | if (port->xdomain) { |
2169 | xd = port->xdomain; | |
2170 | ||
2171 | if (lookup->uuid) { | |
3b4b3235 MW |
2172 | if (xd->remote_uuid && |
2173 | uuid_equal(xd->remote_uuid, lookup->uuid)) | |
d1ff7024 | 2174 | return xd; |
484cb153 RM |
2175 | } else if (lookup->link && |
2176 | lookup->link == xd->link && | |
d1ff7024 MW |
2177 | lookup->depth == xd->depth) { |
2178 | return xd; | |
484cb153 RM |
2179 | } else if (lookup->route && |
2180 | lookup->route == xd->route) { | |
2181 | return xd; | |
d1ff7024 | 2182 | } |
dfe40ca4 | 2183 | } else if (tb_port_has_remote(port)) { |
d1ff7024 MW |
2184 | xd = switch_find_xdomain(port->remote->sw, lookup); |
2185 | if (xd) | |
2186 | return xd; | |
2187 | } | |
2188 | } | |
2189 | ||
2190 | return NULL; | |
2191 | } | |
2192 | ||
2193 | /** | |
2194 | * tb_xdomain_find_by_uuid() - Find an XDomain by UUID | |
2195 | * @tb: Domain where the XDomain belongs to | |
2196 | * @uuid: UUID to look for | |
2197 | * | |
2198 | * Finds XDomain by walking through the Thunderbolt topology below @tb. | |
2199 | * The returned XDomain will have its reference count increased so the | |
2200 | * caller needs to call tb_xdomain_put() when it is done with the | |
2201 | * object. | |
2202 | * | |
2203 | * This will find all XDomains including the ones that are not yet added | |
2204 | * to the bus (handshake is still in progress). | |
2205 | * | |
2206 | * The caller needs to hold @tb->lock. | |
2207 | */ | |
2208 | struct tb_xdomain *tb_xdomain_find_by_uuid(struct tb *tb, const uuid_t *uuid) | |
2209 | { | |
2210 | struct tb_xdomain_lookup lookup; | |
2211 | struct tb_xdomain *xd; | |
2212 | ||
2213 | memset(&lookup, 0, sizeof(lookup)); | |
2214 | lookup.uuid = uuid; | |
2215 | ||
2216 | xd = switch_find_xdomain(tb->root_switch, &lookup); | |
484cb153 | 2217 | return tb_xdomain_get(xd); |
d1ff7024 MW |
2218 | } |
2219 | EXPORT_SYMBOL_GPL(tb_xdomain_find_by_uuid); | |
2220 | ||
2221 | /** | |
2222 | * tb_xdomain_find_by_link_depth() - Find an XDomain by link and depth | |
2223 | * @tb: Domain where the XDomain belongs to | |
2224 | * @link: Root switch link number | |
2225 | * @depth: Depth in the link | |
2226 | * | |
2227 | * Finds XDomain by walking through the Thunderbolt topology below @tb. | |
2228 | * The returned XDomain will have its reference count increased so the | |
2229 | * caller needs to call tb_xdomain_put() when it is done with the | |
2230 | * object. | |
2231 | * | |
2232 | * This will find all XDomains including the ones that are not yet added | |
2233 | * to the bus (handshake is still in progress). | |
2234 | * | |
2235 | * The caller needs to hold @tb->lock. | |
2236 | */ | |
2237 | struct tb_xdomain *tb_xdomain_find_by_link_depth(struct tb *tb, u8 link, | |
2238 | u8 depth) | |
2239 | { | |
2240 | struct tb_xdomain_lookup lookup; | |
2241 | struct tb_xdomain *xd; | |
2242 | ||
2243 | memset(&lookup, 0, sizeof(lookup)); | |
2244 | lookup.link = link; | |
2245 | lookup.depth = depth; | |
2246 | ||
2247 | xd = switch_find_xdomain(tb->root_switch, &lookup); | |
484cb153 RM |
2248 | return tb_xdomain_get(xd); |
2249 | } | |
d1ff7024 | 2250 | |
484cb153 RM |
2251 | /** |
2252 | * tb_xdomain_find_by_route() - Find an XDomain by route string | |
2253 | * @tb: Domain where the XDomain belongs to | |
2254 | * @route: XDomain route string | |
2255 | * | |
2256 | * Finds XDomain by walking through the Thunderbolt topology below @tb. | |
2257 | * The returned XDomain will have its reference count increased so the | |
2258 | * caller needs to call tb_xdomain_put() when it is done with the | |
2259 | * object. | |
2260 | * | |
2261 | * This will find all XDomains including the ones that are not yet added | |
2262 | * to the bus (handshake is still in progress). | |
2263 | * | |
2264 | * The caller needs to hold @tb->lock. | |
2265 | */ | |
2266 | struct tb_xdomain *tb_xdomain_find_by_route(struct tb *tb, u64 route) | |
2267 | { | |
2268 | struct tb_xdomain_lookup lookup; | |
2269 | struct tb_xdomain *xd; | |
2270 | ||
2271 | memset(&lookup, 0, sizeof(lookup)); | |
2272 | lookup.route = route; | |
2273 | ||
2274 | xd = switch_find_xdomain(tb->root_switch, &lookup); | |
2275 | return tb_xdomain_get(xd); | |
d1ff7024 | 2276 | } |
484cb153 | 2277 | EXPORT_SYMBOL_GPL(tb_xdomain_find_by_route); |
d1ff7024 MW |
2278 | |
2279 | bool tb_xdomain_handle_request(struct tb *tb, enum tb_cfg_pkg_type type, | |
2280 | const void *buf, size_t size) | |
2281 | { | |
2282 | const struct tb_protocol_handler *handler, *tmp; | |
2283 | const struct tb_xdp_header *hdr = buf; | |
2284 | unsigned int length; | |
2285 | int ret = 0; | |
2286 | ||
2287 | /* We expect the packet is at least size of the header */ | |
2288 | length = hdr->xd_hdr.length_sn & TB_XDOMAIN_LENGTH_MASK; | |
2289 | if (length != size / 4 - sizeof(hdr->xd_hdr) / 4) | |
2290 | return true; | |
2291 | if (length < sizeof(*hdr) / 4 - sizeof(hdr->xd_hdr) / 4) | |
2292 | return true; | |
2293 | ||
2294 | /* | |
2295 | * Handle XDomain discovery protocol packets directly here. For | |
2296 | * other protocols (based on their UUID) we call registered | |
2297 | * handlers in turn. | |
2298 | */ | |
2299 | if (uuid_equal(&hdr->uuid, &tb_xdp_uuid)) { | |
48f40b96 AP |
2300 | if (type == TB_CFG_PKG_XDOMAIN_REQ) |
2301 | return tb_xdp_schedule_request(tb, hdr, size); | |
d1ff7024 MW |
2302 | return false; |
2303 | } | |
2304 | ||
2305 | mutex_lock(&xdomain_lock); | |
2306 | list_for_each_entry_safe(handler, tmp, &protocol_handlers, list) { | |
2307 | if (!uuid_equal(&hdr->uuid, handler->uuid)) | |
2308 | continue; | |
2309 | ||
2310 | mutex_unlock(&xdomain_lock); | |
2311 | ret = handler->callback(buf, size, handler->data); | |
2312 | mutex_lock(&xdomain_lock); | |
2313 | ||
2314 | if (ret) | |
2315 | break; | |
2316 | } | |
2317 | mutex_unlock(&xdomain_lock); | |
2318 | ||
2319 | return ret > 0; | |
2320 | } | |
2321 | ||
d1ff7024 MW |
2322 | static int update_xdomain(struct device *dev, void *data) |
2323 | { | |
2324 | struct tb_xdomain *xd; | |
2325 | ||
2326 | xd = tb_to_xdomain(dev); | |
2327 | if (xd) { | |
2328 | queue_delayed_work(xd->tb->wq, &xd->properties_changed_work, | |
2329 | msecs_to_jiffies(50)); | |
2330 | } | |
2331 | ||
2332 | return 0; | |
2333 | } | |
2334 | ||
2335 | static void update_all_xdomains(void) | |
2336 | { | |
2337 | bus_for_each_dev(&tb_bus_type, NULL, NULL, update_xdomain); | |
2338 | } | |
2339 | ||
2340 | static bool remove_directory(const char *key, const struct tb_property_dir *dir) | |
2341 | { | |
2342 | struct tb_property *p; | |
2343 | ||
2344 | p = tb_property_find(xdomain_property_dir, key, | |
2345 | TB_PROPERTY_TYPE_DIRECTORY); | |
2346 | if (p && p->value.dir == dir) { | |
2347 | tb_property_remove(p); | |
2348 | return true; | |
2349 | } | |
2350 | return false; | |
2351 | } | |
2352 | ||
2353 | /** | |
2354 | * tb_register_property_dir() - Register property directory to the host | |
2355 | * @key: Key (name) of the directory to add | |
2356 | * @dir: Directory to add | |
2357 | * | |
2358 | * Service drivers can use this function to add new property directory | |
2359 | * to the host available properties. The other connected hosts are | |
2360 | * notified so they can re-read properties of this host if they are | |
2361 | * interested. | |
2362 | * | |
2363 | * Return: %0 on success and negative errno on failure | |
2364 | */ | |
2365 | int tb_register_property_dir(const char *key, struct tb_property_dir *dir) | |
2366 | { | |
2367 | int ret; | |
2368 | ||
acb40d84 MW |
2369 | if (WARN_ON(!xdomain_property_dir)) |
2370 | return -EAGAIN; | |
2371 | ||
d1ff7024 MW |
2372 | if (!key || strlen(key) > 8) |
2373 | return -EINVAL; | |
2374 | ||
2375 | mutex_lock(&xdomain_lock); | |
2376 | if (tb_property_find(xdomain_property_dir, key, | |
2377 | TB_PROPERTY_TYPE_DIRECTORY)) { | |
2378 | ret = -EEXIST; | |
2379 | goto err_unlock; | |
2380 | } | |
2381 | ||
2382 | ret = tb_property_add_dir(xdomain_property_dir, key, dir); | |
2383 | if (ret) | |
2384 | goto err_unlock; | |
2385 | ||
46b494f2 | 2386 | xdomain_property_block_gen++; |
d1ff7024 MW |
2387 | |
2388 | mutex_unlock(&xdomain_lock); | |
2389 | update_all_xdomains(); | |
2390 | return 0; | |
2391 | ||
2392 | err_unlock: | |
2393 | mutex_unlock(&xdomain_lock); | |
2394 | return ret; | |
2395 | } | |
2396 | EXPORT_SYMBOL_GPL(tb_register_property_dir); | |
2397 | ||
2398 | /** | |
2399 | * tb_unregister_property_dir() - Removes property directory from host | |
2400 | * @key: Key (name) of the directory | |
2401 | * @dir: Directory to remove | |
2402 | * | |
2403 | * This will remove the existing directory from this host and notify the | |
2404 | * connected hosts about the change. | |
2405 | */ | |
2406 | void tb_unregister_property_dir(const char *key, struct tb_property_dir *dir) | |
2407 | { | |
2408 | int ret = 0; | |
2409 | ||
2410 | mutex_lock(&xdomain_lock); | |
2411 | if (remove_directory(key, dir)) | |
46b494f2 | 2412 | xdomain_property_block_gen++; |
d1ff7024 MW |
2413 | mutex_unlock(&xdomain_lock); |
2414 | ||
2415 | if (!ret) | |
2416 | update_all_xdomains(); | |
2417 | } | |
2418 | EXPORT_SYMBOL_GPL(tb_unregister_property_dir); | |
2419 | ||
2420 | int tb_xdomain_init(void) | |
2421 | { | |
d1ff7024 MW |
2422 | xdomain_property_dir = tb_property_create_dir(NULL); |
2423 | if (!xdomain_property_dir) | |
2424 | return -ENOMEM; | |
2425 | ||
2426 | /* | |
2427 | * Initialize standard set of properties without any service | |
2428 | * directories. Those will be added by service drivers | |
2429 | * themselves when they are loaded. | |
8a00c67e | 2430 | * |
46b494f2 MW |
2431 | * Rest of the properties are filled dynamically based on these |
2432 | * when the P2P connection is made. | |
d1ff7024 MW |
2433 | */ |
2434 | tb_property_add_immediate(xdomain_property_dir, "vendorid", | |
2435 | PCI_VENDOR_ID_INTEL); | |
2436 | tb_property_add_text(xdomain_property_dir, "vendorid", "Intel Corp."); | |
2437 | tb_property_add_immediate(xdomain_property_dir, "deviceid", 0x1); | |
d1ff7024 MW |
2438 | tb_property_add_immediate(xdomain_property_dir, "devicerv", 0x80000100); |
2439 | ||
a251c17a | 2440 | xdomain_property_block_gen = get_random_u32(); |
8a00c67e | 2441 | return 0; |
d1ff7024 MW |
2442 | } |
2443 | ||
2444 | void tb_xdomain_exit(void) | |
2445 | { | |
d1ff7024 MW |
2446 | tb_property_free_dir(xdomain_property_dir); |
2447 | } |