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d1ff7024 MW |
1 | /* |
2 | * Thunderbolt XDomain discovery protocol support | |
3 | * | |
4 | * Copyright (C) 2017, Intel Corporation | |
5 | * Authors: Michael Jamet <michael.jamet@intel.com> | |
6 | * Mika Westerberg <mika.westerberg@linux.intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/device.h> | |
14 | #include <linux/kmod.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/utsname.h> | |
17 | #include <linux/uuid.h> | |
18 | #include <linux/workqueue.h> | |
19 | ||
20 | #include "tb.h" | |
21 | ||
22 | #define XDOMAIN_DEFAULT_TIMEOUT 5000 /* ms */ | |
23 | #define XDOMAIN_PROPERTIES_RETRIES 60 | |
24 | #define XDOMAIN_PROPERTIES_CHANGED_RETRIES 10 | |
25 | ||
26 | struct xdomain_request_work { | |
27 | struct work_struct work; | |
28 | struct tb_xdp_header *pkg; | |
29 | struct tb *tb; | |
30 | }; | |
31 | ||
32 | /* Serializes access to the properties and protocol handlers below */ | |
33 | static DEFINE_MUTEX(xdomain_lock); | |
34 | ||
35 | /* Properties exposed to the remote domains */ | |
36 | static struct tb_property_dir *xdomain_property_dir; | |
37 | static u32 *xdomain_property_block; | |
38 | static u32 xdomain_property_block_len; | |
39 | static u32 xdomain_property_block_gen; | |
40 | ||
41 | /* Additional protocol handlers */ | |
42 | static LIST_HEAD(protocol_handlers); | |
43 | ||
44 | /* UUID for XDomain discovery protocol: b638d70e-42ff-40bb-97c2-90e2c0b2ff07 */ | |
45 | static const uuid_t tb_xdp_uuid = | |
46 | UUID_INIT(0xb638d70e, 0x42ff, 0x40bb, | |
47 | 0x97, 0xc2, 0x90, 0xe2, 0xc0, 0xb2, 0xff, 0x07); | |
48 | ||
49 | static bool tb_xdomain_match(const struct tb_cfg_request *req, | |
50 | const struct ctl_pkg *pkg) | |
51 | { | |
52 | switch (pkg->frame.eof) { | |
53 | case TB_CFG_PKG_ERROR: | |
54 | return true; | |
55 | ||
56 | case TB_CFG_PKG_XDOMAIN_RESP: { | |
57 | const struct tb_xdp_header *res_hdr = pkg->buffer; | |
58 | const struct tb_xdp_header *req_hdr = req->request; | |
d1ff7024 MW |
59 | |
60 | if (pkg->frame.size < req->response_size / 4) | |
61 | return false; | |
62 | ||
63 | /* Make sure route matches */ | |
64 | if ((res_hdr->xd_hdr.route_hi & ~BIT(31)) != | |
65 | req_hdr->xd_hdr.route_hi) | |
66 | return false; | |
67 | if ((res_hdr->xd_hdr.route_lo) != req_hdr->xd_hdr.route_lo) | |
68 | return false; | |
69 | ||
d1ff7024 MW |
70 | /* Check that the XDomain protocol matches */ |
71 | if (!uuid_equal(&res_hdr->uuid, &req_hdr->uuid)) | |
72 | return false; | |
73 | ||
74 | return true; | |
75 | } | |
76 | ||
77 | default: | |
78 | return false; | |
79 | } | |
80 | } | |
81 | ||
82 | static bool tb_xdomain_copy(struct tb_cfg_request *req, | |
83 | const struct ctl_pkg *pkg) | |
84 | { | |
85 | memcpy(req->response, pkg->buffer, req->response_size); | |
86 | req->result.err = 0; | |
87 | return true; | |
88 | } | |
89 | ||
90 | static void response_ready(void *data) | |
91 | { | |
92 | tb_cfg_request_put(data); | |
93 | } | |
94 | ||
95 | static int __tb_xdomain_response(struct tb_ctl *ctl, const void *response, | |
96 | size_t size, enum tb_cfg_pkg_type type) | |
97 | { | |
98 | struct tb_cfg_request *req; | |
99 | ||
100 | req = tb_cfg_request_alloc(); | |
101 | if (!req) | |
102 | return -ENOMEM; | |
103 | ||
104 | req->match = tb_xdomain_match; | |
105 | req->copy = tb_xdomain_copy; | |
106 | req->request = response; | |
107 | req->request_size = size; | |
108 | req->request_type = type; | |
109 | ||
110 | return tb_cfg_request(ctl, req, response_ready, req); | |
111 | } | |
112 | ||
113 | /** | |
114 | * tb_xdomain_response() - Send a XDomain response message | |
115 | * @xd: XDomain to send the message | |
116 | * @response: Response to send | |
117 | * @size: Size of the response | |
118 | * @type: PDF type of the response | |
119 | * | |
120 | * This can be used to send a XDomain response message to the other | |
121 | * domain. No response for the message is expected. | |
122 | * | |
123 | * Return: %0 in case of success and negative errno in case of failure | |
124 | */ | |
125 | int tb_xdomain_response(struct tb_xdomain *xd, const void *response, | |
126 | size_t size, enum tb_cfg_pkg_type type) | |
127 | { | |
128 | return __tb_xdomain_response(xd->tb->ctl, response, size, type); | |
129 | } | |
130 | EXPORT_SYMBOL_GPL(tb_xdomain_response); | |
131 | ||
132 | static int __tb_xdomain_request(struct tb_ctl *ctl, const void *request, | |
133 | size_t request_size, enum tb_cfg_pkg_type request_type, void *response, | |
134 | size_t response_size, enum tb_cfg_pkg_type response_type, | |
135 | unsigned int timeout_msec) | |
136 | { | |
137 | struct tb_cfg_request *req; | |
138 | struct tb_cfg_result res; | |
139 | ||
140 | req = tb_cfg_request_alloc(); | |
141 | if (!req) | |
142 | return -ENOMEM; | |
143 | ||
144 | req->match = tb_xdomain_match; | |
145 | req->copy = tb_xdomain_copy; | |
146 | req->request = request; | |
147 | req->request_size = request_size; | |
148 | req->request_type = request_type; | |
149 | req->response = response; | |
150 | req->response_size = response_size; | |
151 | req->response_type = response_type; | |
152 | ||
153 | res = tb_cfg_request_sync(ctl, req, timeout_msec); | |
154 | ||
155 | tb_cfg_request_put(req); | |
156 | ||
157 | return res.err == 1 ? -EIO : res.err; | |
158 | } | |
159 | ||
160 | /** | |
161 | * tb_xdomain_request() - Send a XDomain request | |
162 | * @xd: XDomain to send the request | |
163 | * @request: Request to send | |
164 | * @request_size: Size of the request in bytes | |
165 | * @request_type: PDF type of the request | |
166 | * @response: Response is copied here | |
167 | * @response_size: Expected size of the response in bytes | |
168 | * @response_type: Expected PDF type of the response | |
169 | * @timeout_msec: Timeout in milliseconds to wait for the response | |
170 | * | |
171 | * This function can be used to send XDomain control channel messages to | |
172 | * the other domain. The function waits until the response is received | |
173 | * or when timeout triggers. Whichever comes first. | |
174 | * | |
175 | * Return: %0 in case of success and negative errno in case of failure | |
176 | */ | |
177 | int tb_xdomain_request(struct tb_xdomain *xd, const void *request, | |
178 | size_t request_size, enum tb_cfg_pkg_type request_type, | |
179 | void *response, size_t response_size, | |
180 | enum tb_cfg_pkg_type response_type, unsigned int timeout_msec) | |
181 | { | |
182 | return __tb_xdomain_request(xd->tb->ctl, request, request_size, | |
183 | request_type, response, response_size, | |
184 | response_type, timeout_msec); | |
185 | } | |
186 | EXPORT_SYMBOL_GPL(tb_xdomain_request); | |
187 | ||
188 | static inline void tb_xdp_fill_header(struct tb_xdp_header *hdr, u64 route, | |
189 | u8 sequence, enum tb_xdp_type type, size_t size) | |
190 | { | |
191 | u32 length_sn; | |
192 | ||
193 | length_sn = (size - sizeof(hdr->xd_hdr)) / 4; | |
194 | length_sn |= (sequence << TB_XDOMAIN_SN_SHIFT) & TB_XDOMAIN_SN_MASK; | |
195 | ||
196 | hdr->xd_hdr.route_hi = upper_32_bits(route); | |
197 | hdr->xd_hdr.route_lo = lower_32_bits(route); | |
198 | hdr->xd_hdr.length_sn = length_sn; | |
199 | hdr->type = type; | |
200 | memcpy(&hdr->uuid, &tb_xdp_uuid, sizeof(tb_xdp_uuid)); | |
201 | } | |
202 | ||
203 | static int tb_xdp_handle_error(const struct tb_xdp_header *hdr) | |
204 | { | |
205 | const struct tb_xdp_error_response *error; | |
206 | ||
207 | if (hdr->type != ERROR_RESPONSE) | |
208 | return 0; | |
209 | ||
210 | error = (const struct tb_xdp_error_response *)hdr; | |
211 | ||
212 | switch (error->error) { | |
213 | case ERROR_UNKNOWN_PACKET: | |
214 | case ERROR_UNKNOWN_DOMAIN: | |
215 | return -EIO; | |
216 | case ERROR_NOT_SUPPORTED: | |
217 | return -ENOTSUPP; | |
218 | case ERROR_NOT_READY: | |
219 | return -EAGAIN; | |
220 | default: | |
221 | break; | |
222 | } | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | static int tb_xdp_error_response(struct tb_ctl *ctl, u64 route, u8 sequence, | |
228 | enum tb_xdp_error error) | |
229 | { | |
230 | struct tb_xdp_error_response res; | |
231 | ||
232 | memset(&res, 0, sizeof(res)); | |
233 | tb_xdp_fill_header(&res.hdr, route, sequence, ERROR_RESPONSE, | |
234 | sizeof(res)); | |
235 | res.error = error; | |
236 | ||
237 | return __tb_xdomain_response(ctl, &res, sizeof(res), | |
238 | TB_CFG_PKG_XDOMAIN_RESP); | |
239 | } | |
240 | ||
241 | static int tb_xdp_properties_request(struct tb_ctl *ctl, u64 route, | |
242 | const uuid_t *src_uuid, const uuid_t *dst_uuid, int retry, | |
243 | u32 **block, u32 *generation) | |
244 | { | |
245 | struct tb_xdp_properties_response *res; | |
246 | struct tb_xdp_properties req; | |
247 | u16 data_len, len; | |
248 | size_t total_size; | |
249 | u32 *data = NULL; | |
250 | int ret; | |
251 | ||
252 | total_size = sizeof(*res) + TB_XDP_PROPERTIES_MAX_DATA_LENGTH * 4; | |
253 | res = kzalloc(total_size, GFP_KERNEL); | |
254 | if (!res) | |
255 | return -ENOMEM; | |
256 | ||
257 | memset(&req, 0, sizeof(req)); | |
258 | tb_xdp_fill_header(&req.hdr, route, retry % 4, PROPERTIES_REQUEST, | |
259 | sizeof(req)); | |
260 | memcpy(&req.src_uuid, src_uuid, sizeof(*src_uuid)); | |
261 | memcpy(&req.dst_uuid, dst_uuid, sizeof(*dst_uuid)); | |
262 | ||
263 | len = 0; | |
264 | data_len = 0; | |
265 | ||
266 | do { | |
267 | ret = __tb_xdomain_request(ctl, &req, sizeof(req), | |
268 | TB_CFG_PKG_XDOMAIN_REQ, res, | |
269 | total_size, TB_CFG_PKG_XDOMAIN_RESP, | |
270 | XDOMAIN_DEFAULT_TIMEOUT); | |
271 | if (ret) | |
272 | goto err; | |
273 | ||
274 | ret = tb_xdp_handle_error(&res->hdr); | |
275 | if (ret) | |
276 | goto err; | |
277 | ||
278 | /* | |
279 | * Package length includes the whole payload without the | |
280 | * XDomain header. Validate first that the package is at | |
281 | * least size of the response structure. | |
282 | */ | |
283 | len = res->hdr.xd_hdr.length_sn & TB_XDOMAIN_LENGTH_MASK; | |
284 | if (len < sizeof(*res) / 4) { | |
285 | ret = -EINVAL; | |
286 | goto err; | |
287 | } | |
288 | ||
289 | len += sizeof(res->hdr.xd_hdr) / 4; | |
290 | len -= sizeof(*res) / 4; | |
291 | ||
292 | if (res->offset != req.offset) { | |
293 | ret = -EINVAL; | |
294 | goto err; | |
295 | } | |
296 | ||
297 | /* | |
298 | * First time allocate block that has enough space for | |
299 | * the whole properties block. | |
300 | */ | |
301 | if (!data) { | |
302 | data_len = res->data_length; | |
303 | if (data_len > TB_XDP_PROPERTIES_MAX_LENGTH) { | |
304 | ret = -E2BIG; | |
305 | goto err; | |
306 | } | |
307 | ||
308 | data = kcalloc(data_len, sizeof(u32), GFP_KERNEL); | |
309 | if (!data) { | |
310 | ret = -ENOMEM; | |
311 | goto err; | |
312 | } | |
313 | } | |
314 | ||
315 | memcpy(data + req.offset, res->data, len * 4); | |
316 | req.offset += len; | |
317 | } while (!data_len || req.offset < data_len); | |
318 | ||
319 | *block = data; | |
320 | *generation = res->generation; | |
321 | ||
322 | kfree(res); | |
323 | ||
324 | return data_len; | |
325 | ||
326 | err: | |
327 | kfree(data); | |
328 | kfree(res); | |
329 | ||
330 | return ret; | |
331 | } | |
332 | ||
333 | static int tb_xdp_properties_response(struct tb *tb, struct tb_ctl *ctl, | |
334 | u64 route, u8 sequence, const uuid_t *src_uuid, | |
335 | const struct tb_xdp_properties *req) | |
336 | { | |
337 | struct tb_xdp_properties_response *res; | |
338 | size_t total_size; | |
339 | u16 len; | |
340 | int ret; | |
341 | ||
342 | /* | |
343 | * Currently we expect all requests to be directed to us. The | |
344 | * protocol supports forwarding, though which we might add | |
345 | * support later on. | |
346 | */ | |
347 | if (!uuid_equal(src_uuid, &req->dst_uuid)) { | |
348 | tb_xdp_error_response(ctl, route, sequence, | |
349 | ERROR_UNKNOWN_DOMAIN); | |
350 | return 0; | |
351 | } | |
352 | ||
353 | mutex_lock(&xdomain_lock); | |
354 | ||
355 | if (req->offset >= xdomain_property_block_len) { | |
356 | mutex_unlock(&xdomain_lock); | |
357 | return -EINVAL; | |
358 | } | |
359 | ||
360 | len = xdomain_property_block_len - req->offset; | |
361 | len = min_t(u16, len, TB_XDP_PROPERTIES_MAX_DATA_LENGTH); | |
362 | total_size = sizeof(*res) + len * 4; | |
363 | ||
364 | res = kzalloc(total_size, GFP_KERNEL); | |
365 | if (!res) { | |
366 | mutex_unlock(&xdomain_lock); | |
367 | return -ENOMEM; | |
368 | } | |
369 | ||
370 | tb_xdp_fill_header(&res->hdr, route, sequence, PROPERTIES_RESPONSE, | |
371 | total_size); | |
372 | res->generation = xdomain_property_block_gen; | |
373 | res->data_length = xdomain_property_block_len; | |
374 | res->offset = req->offset; | |
375 | uuid_copy(&res->src_uuid, src_uuid); | |
376 | uuid_copy(&res->dst_uuid, &req->src_uuid); | |
377 | memcpy(res->data, &xdomain_property_block[req->offset], len * 4); | |
378 | ||
379 | mutex_unlock(&xdomain_lock); | |
380 | ||
381 | ret = __tb_xdomain_response(ctl, res, total_size, | |
382 | TB_CFG_PKG_XDOMAIN_RESP); | |
383 | ||
384 | kfree(res); | |
385 | return ret; | |
386 | } | |
387 | ||
388 | static int tb_xdp_properties_changed_request(struct tb_ctl *ctl, u64 route, | |
389 | int retry, const uuid_t *uuid) | |
390 | { | |
391 | struct tb_xdp_properties_changed_response res; | |
392 | struct tb_xdp_properties_changed req; | |
393 | int ret; | |
394 | ||
395 | memset(&req, 0, sizeof(req)); | |
396 | tb_xdp_fill_header(&req.hdr, route, retry % 4, | |
397 | PROPERTIES_CHANGED_REQUEST, sizeof(req)); | |
398 | uuid_copy(&req.src_uuid, uuid); | |
399 | ||
400 | memset(&res, 0, sizeof(res)); | |
401 | ret = __tb_xdomain_request(ctl, &req, sizeof(req), | |
402 | TB_CFG_PKG_XDOMAIN_REQ, &res, sizeof(res), | |
403 | TB_CFG_PKG_XDOMAIN_RESP, | |
404 | XDOMAIN_DEFAULT_TIMEOUT); | |
405 | if (ret) | |
406 | return ret; | |
407 | ||
408 | return tb_xdp_handle_error(&res.hdr); | |
409 | } | |
410 | ||
411 | static int | |
412 | tb_xdp_properties_changed_response(struct tb_ctl *ctl, u64 route, u8 sequence) | |
413 | { | |
414 | struct tb_xdp_properties_changed_response res; | |
415 | ||
416 | memset(&res, 0, sizeof(res)); | |
417 | tb_xdp_fill_header(&res.hdr, route, sequence, | |
418 | PROPERTIES_CHANGED_RESPONSE, sizeof(res)); | |
419 | return __tb_xdomain_response(ctl, &res, sizeof(res), | |
420 | TB_CFG_PKG_XDOMAIN_RESP); | |
421 | } | |
422 | ||
423 | /** | |
424 | * tb_register_protocol_handler() - Register protocol handler | |
425 | * @handler: Handler to register | |
426 | * | |
427 | * This allows XDomain service drivers to hook into incoming XDomain | |
428 | * messages. After this function is called the service driver needs to | |
429 | * be able to handle calls to callback whenever a package with the | |
430 | * registered protocol is received. | |
431 | */ | |
432 | int tb_register_protocol_handler(struct tb_protocol_handler *handler) | |
433 | { | |
434 | if (!handler->uuid || !handler->callback) | |
435 | return -EINVAL; | |
436 | if (uuid_equal(handler->uuid, &tb_xdp_uuid)) | |
437 | return -EINVAL; | |
438 | ||
439 | mutex_lock(&xdomain_lock); | |
440 | list_add_tail(&handler->list, &protocol_handlers); | |
441 | mutex_unlock(&xdomain_lock); | |
442 | ||
443 | return 0; | |
444 | } | |
445 | EXPORT_SYMBOL_GPL(tb_register_protocol_handler); | |
446 | ||
447 | /** | |
448 | * tb_unregister_protocol_handler() - Unregister protocol handler | |
449 | * @handler: Handler to unregister | |
450 | * | |
451 | * Removes the previously registered protocol handler. | |
452 | */ | |
453 | void tb_unregister_protocol_handler(struct tb_protocol_handler *handler) | |
454 | { | |
455 | mutex_lock(&xdomain_lock); | |
456 | list_del_init(&handler->list); | |
457 | mutex_unlock(&xdomain_lock); | |
458 | } | |
459 | EXPORT_SYMBOL_GPL(tb_unregister_protocol_handler); | |
460 | ||
461 | static void tb_xdp_handle_request(struct work_struct *work) | |
462 | { | |
463 | struct xdomain_request_work *xw = container_of(work, typeof(*xw), work); | |
464 | const struct tb_xdp_header *pkg = xw->pkg; | |
465 | const struct tb_xdomain_header *xhdr = &pkg->xd_hdr; | |
466 | struct tb *tb = xw->tb; | |
467 | struct tb_ctl *ctl = tb->ctl; | |
468 | const uuid_t *uuid; | |
469 | int ret = 0; | |
9a03c3d3 | 470 | u32 sequence; |
d1ff7024 MW |
471 | u64 route; |
472 | ||
473 | route = ((u64)xhdr->route_hi << 32 | xhdr->route_lo) & ~BIT_ULL(63); | |
474 | sequence = xhdr->length_sn & TB_XDOMAIN_SN_MASK; | |
475 | sequence >>= TB_XDOMAIN_SN_SHIFT; | |
476 | ||
477 | mutex_lock(&tb->lock); | |
478 | if (tb->root_switch) | |
479 | uuid = tb->root_switch->uuid; | |
480 | else | |
481 | uuid = NULL; | |
482 | mutex_unlock(&tb->lock); | |
483 | ||
484 | if (!uuid) { | |
485 | tb_xdp_error_response(ctl, route, sequence, ERROR_NOT_READY); | |
486 | goto out; | |
487 | } | |
488 | ||
489 | switch (pkg->type) { | |
490 | case PROPERTIES_REQUEST: | |
491 | ret = tb_xdp_properties_response(tb, ctl, route, sequence, uuid, | |
492 | (const struct tb_xdp_properties *)pkg); | |
493 | break; | |
494 | ||
495 | case PROPERTIES_CHANGED_REQUEST: { | |
496 | const struct tb_xdp_properties_changed *xchg = | |
497 | (const struct tb_xdp_properties_changed *)pkg; | |
498 | struct tb_xdomain *xd; | |
499 | ||
500 | ret = tb_xdp_properties_changed_response(ctl, route, sequence); | |
501 | ||
502 | /* | |
503 | * Since the properties have been changed, let's update | |
504 | * the xdomain related to this connection as well in | |
505 | * case there is a change in services it offers. | |
506 | */ | |
507 | xd = tb_xdomain_find_by_uuid_locked(tb, &xchg->src_uuid); | |
508 | if (xd) { | |
509 | queue_delayed_work(tb->wq, &xd->get_properties_work, | |
510 | msecs_to_jiffies(50)); | |
511 | tb_xdomain_put(xd); | |
512 | } | |
513 | ||
514 | break; | |
515 | } | |
516 | ||
517 | default: | |
518 | break; | |
519 | } | |
520 | ||
521 | if (ret) { | |
522 | tb_warn(tb, "failed to send XDomain response for %#x\n", | |
523 | pkg->type); | |
524 | } | |
525 | ||
526 | out: | |
527 | kfree(xw->pkg); | |
528 | kfree(xw); | |
529 | } | |
530 | ||
531 | static void | |
532 | tb_xdp_schedule_request(struct tb *tb, const struct tb_xdp_header *hdr, | |
533 | size_t size) | |
534 | { | |
535 | struct xdomain_request_work *xw; | |
536 | ||
537 | xw = kmalloc(sizeof(*xw), GFP_KERNEL); | |
538 | if (!xw) | |
539 | return; | |
540 | ||
541 | INIT_WORK(&xw->work, tb_xdp_handle_request); | |
542 | xw->pkg = kmemdup(hdr, size, GFP_KERNEL); | |
543 | xw->tb = tb; | |
544 | ||
545 | queue_work(tb->wq, &xw->work); | |
546 | } | |
547 | ||
548 | /** | |
549 | * tb_register_service_driver() - Register XDomain service driver | |
550 | * @drv: Driver to register | |
551 | * | |
552 | * Registers new service driver from @drv to the bus. | |
553 | */ | |
554 | int tb_register_service_driver(struct tb_service_driver *drv) | |
555 | { | |
556 | drv->driver.bus = &tb_bus_type; | |
557 | return driver_register(&drv->driver); | |
558 | } | |
559 | EXPORT_SYMBOL_GPL(tb_register_service_driver); | |
560 | ||
561 | /** | |
562 | * tb_unregister_service_driver() - Unregister XDomain service driver | |
563 | * @xdrv: Driver to unregister | |
564 | * | |
565 | * Unregisters XDomain service driver from the bus. | |
566 | */ | |
567 | void tb_unregister_service_driver(struct tb_service_driver *drv) | |
568 | { | |
569 | driver_unregister(&drv->driver); | |
570 | } | |
571 | EXPORT_SYMBOL_GPL(tb_unregister_service_driver); | |
572 | ||
573 | static ssize_t key_show(struct device *dev, struct device_attribute *attr, | |
574 | char *buf) | |
575 | { | |
576 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
577 | ||
578 | /* | |
579 | * It should be null terminated but anything else is pretty much | |
580 | * allowed. | |
581 | */ | |
582 | return sprintf(buf, "%*pEp\n", (int)strlen(svc->key), svc->key); | |
583 | } | |
584 | static DEVICE_ATTR_RO(key); | |
585 | ||
586 | static int get_modalias(struct tb_service *svc, char *buf, size_t size) | |
587 | { | |
588 | return snprintf(buf, size, "tbsvc:k%sp%08Xv%08Xr%08X", svc->key, | |
589 | svc->prtcid, svc->prtcvers, svc->prtcrevs); | |
590 | } | |
591 | ||
592 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | |
593 | char *buf) | |
594 | { | |
595 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
596 | ||
597 | /* Full buffer size except new line and null termination */ | |
598 | get_modalias(svc, buf, PAGE_SIZE - 2); | |
599 | return sprintf(buf, "%s\n", buf); | |
600 | } | |
601 | static DEVICE_ATTR_RO(modalias); | |
602 | ||
603 | static ssize_t prtcid_show(struct device *dev, struct device_attribute *attr, | |
604 | char *buf) | |
605 | { | |
606 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
607 | ||
608 | return sprintf(buf, "%u\n", svc->prtcid); | |
609 | } | |
610 | static DEVICE_ATTR_RO(prtcid); | |
611 | ||
612 | static ssize_t prtcvers_show(struct device *dev, struct device_attribute *attr, | |
613 | char *buf) | |
614 | { | |
615 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
616 | ||
617 | return sprintf(buf, "%u\n", svc->prtcvers); | |
618 | } | |
619 | static DEVICE_ATTR_RO(prtcvers); | |
620 | ||
621 | static ssize_t prtcrevs_show(struct device *dev, struct device_attribute *attr, | |
622 | char *buf) | |
623 | { | |
624 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
625 | ||
626 | return sprintf(buf, "%u\n", svc->prtcrevs); | |
627 | } | |
628 | static DEVICE_ATTR_RO(prtcrevs); | |
629 | ||
630 | static ssize_t prtcstns_show(struct device *dev, struct device_attribute *attr, | |
631 | char *buf) | |
632 | { | |
633 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
634 | ||
635 | return sprintf(buf, "0x%08x\n", svc->prtcstns); | |
636 | } | |
637 | static DEVICE_ATTR_RO(prtcstns); | |
638 | ||
639 | static struct attribute *tb_service_attrs[] = { | |
640 | &dev_attr_key.attr, | |
641 | &dev_attr_modalias.attr, | |
642 | &dev_attr_prtcid.attr, | |
643 | &dev_attr_prtcvers.attr, | |
644 | &dev_attr_prtcrevs.attr, | |
645 | &dev_attr_prtcstns.attr, | |
646 | NULL, | |
647 | }; | |
648 | ||
649 | static struct attribute_group tb_service_attr_group = { | |
650 | .attrs = tb_service_attrs, | |
651 | }; | |
652 | ||
653 | static const struct attribute_group *tb_service_attr_groups[] = { | |
654 | &tb_service_attr_group, | |
655 | NULL, | |
656 | }; | |
657 | ||
658 | static int tb_service_uevent(struct device *dev, struct kobj_uevent_env *env) | |
659 | { | |
660 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
661 | char modalias[64]; | |
662 | ||
663 | get_modalias(svc, modalias, sizeof(modalias)); | |
664 | return add_uevent_var(env, "MODALIAS=%s", modalias); | |
665 | } | |
666 | ||
667 | static void tb_service_release(struct device *dev) | |
668 | { | |
669 | struct tb_service *svc = container_of(dev, struct tb_service, dev); | |
670 | struct tb_xdomain *xd = tb_service_parent(svc); | |
671 | ||
672 | ida_simple_remove(&xd->service_ids, svc->id); | |
673 | kfree(svc->key); | |
674 | kfree(svc); | |
675 | } | |
676 | ||
677 | struct device_type tb_service_type = { | |
678 | .name = "thunderbolt_service", | |
679 | .groups = tb_service_attr_groups, | |
680 | .uevent = tb_service_uevent, | |
681 | .release = tb_service_release, | |
682 | }; | |
683 | EXPORT_SYMBOL_GPL(tb_service_type); | |
684 | ||
685 | static int remove_missing_service(struct device *dev, void *data) | |
686 | { | |
687 | struct tb_xdomain *xd = data; | |
688 | struct tb_service *svc; | |
689 | ||
690 | svc = tb_to_service(dev); | |
691 | if (!svc) | |
692 | return 0; | |
693 | ||
694 | if (!tb_property_find(xd->properties, svc->key, | |
695 | TB_PROPERTY_TYPE_DIRECTORY)) | |
696 | device_unregister(dev); | |
697 | ||
698 | return 0; | |
699 | } | |
700 | ||
701 | static int find_service(struct device *dev, void *data) | |
702 | { | |
703 | const struct tb_property *p = data; | |
704 | struct tb_service *svc; | |
705 | ||
706 | svc = tb_to_service(dev); | |
707 | if (!svc) | |
708 | return 0; | |
709 | ||
710 | return !strcmp(svc->key, p->key); | |
711 | } | |
712 | ||
713 | static int populate_service(struct tb_service *svc, | |
714 | struct tb_property *property) | |
715 | { | |
716 | struct tb_property_dir *dir = property->value.dir; | |
717 | struct tb_property *p; | |
718 | ||
719 | /* Fill in standard properties */ | |
720 | p = tb_property_find(dir, "prtcid", TB_PROPERTY_TYPE_VALUE); | |
721 | if (p) | |
722 | svc->prtcid = p->value.immediate; | |
723 | p = tb_property_find(dir, "prtcvers", TB_PROPERTY_TYPE_VALUE); | |
724 | if (p) | |
725 | svc->prtcvers = p->value.immediate; | |
726 | p = tb_property_find(dir, "prtcrevs", TB_PROPERTY_TYPE_VALUE); | |
727 | if (p) | |
728 | svc->prtcrevs = p->value.immediate; | |
729 | p = tb_property_find(dir, "prtcstns", TB_PROPERTY_TYPE_VALUE); | |
730 | if (p) | |
731 | svc->prtcstns = p->value.immediate; | |
732 | ||
733 | svc->key = kstrdup(property->key, GFP_KERNEL); | |
734 | if (!svc->key) | |
735 | return -ENOMEM; | |
736 | ||
737 | return 0; | |
738 | } | |
739 | ||
740 | static void enumerate_services(struct tb_xdomain *xd) | |
741 | { | |
742 | struct tb_service *svc; | |
743 | struct tb_property *p; | |
744 | struct device *dev; | |
745 | ||
746 | /* | |
747 | * First remove all services that are not available anymore in | |
748 | * the updated property block. | |
749 | */ | |
750 | device_for_each_child_reverse(&xd->dev, xd, remove_missing_service); | |
751 | ||
752 | /* Then re-enumerate properties creating new services as we go */ | |
753 | tb_property_for_each(xd->properties, p) { | |
754 | if (p->type != TB_PROPERTY_TYPE_DIRECTORY) | |
755 | continue; | |
756 | ||
757 | /* If the service exists already we are fine */ | |
758 | dev = device_find_child(&xd->dev, p, find_service); | |
759 | if (dev) { | |
760 | put_device(dev); | |
761 | continue; | |
762 | } | |
763 | ||
764 | svc = kzalloc(sizeof(*svc), GFP_KERNEL); | |
765 | if (!svc) | |
766 | break; | |
767 | ||
768 | if (populate_service(svc, p)) { | |
769 | kfree(svc); | |
770 | break; | |
771 | } | |
772 | ||
773 | svc->id = ida_simple_get(&xd->service_ids, 0, 0, GFP_KERNEL); | |
774 | svc->dev.bus = &tb_bus_type; | |
775 | svc->dev.type = &tb_service_type; | |
776 | svc->dev.parent = &xd->dev; | |
777 | dev_set_name(&svc->dev, "%s.%d", dev_name(&xd->dev), svc->id); | |
778 | ||
779 | if (device_register(&svc->dev)) { | |
780 | put_device(&svc->dev); | |
781 | break; | |
782 | } | |
783 | } | |
784 | } | |
785 | ||
786 | static int populate_properties(struct tb_xdomain *xd, | |
787 | struct tb_property_dir *dir) | |
788 | { | |
789 | const struct tb_property *p; | |
790 | ||
791 | /* Required properties */ | |
792 | p = tb_property_find(dir, "deviceid", TB_PROPERTY_TYPE_VALUE); | |
793 | if (!p) | |
794 | return -EINVAL; | |
795 | xd->device = p->value.immediate; | |
796 | ||
797 | p = tb_property_find(dir, "vendorid", TB_PROPERTY_TYPE_VALUE); | |
798 | if (!p) | |
799 | return -EINVAL; | |
800 | xd->vendor = p->value.immediate; | |
801 | ||
802 | kfree(xd->device_name); | |
803 | xd->device_name = NULL; | |
804 | kfree(xd->vendor_name); | |
805 | xd->vendor_name = NULL; | |
806 | ||
807 | /* Optional properties */ | |
808 | p = tb_property_find(dir, "deviceid", TB_PROPERTY_TYPE_TEXT); | |
809 | if (p) | |
810 | xd->device_name = kstrdup(p->value.text, GFP_KERNEL); | |
811 | p = tb_property_find(dir, "vendorid", TB_PROPERTY_TYPE_TEXT); | |
812 | if (p) | |
813 | xd->vendor_name = kstrdup(p->value.text, GFP_KERNEL); | |
814 | ||
815 | return 0; | |
816 | } | |
817 | ||
818 | /* Called with @xd->lock held */ | |
819 | static void tb_xdomain_restore_paths(struct tb_xdomain *xd) | |
820 | { | |
821 | if (!xd->resume) | |
822 | return; | |
823 | ||
824 | xd->resume = false; | |
825 | if (xd->transmit_path) { | |
826 | dev_dbg(&xd->dev, "re-establishing DMA path\n"); | |
827 | tb_domain_approve_xdomain_paths(xd->tb, xd); | |
828 | } | |
829 | } | |
830 | ||
831 | static void tb_xdomain_get_properties(struct work_struct *work) | |
832 | { | |
833 | struct tb_xdomain *xd = container_of(work, typeof(*xd), | |
834 | get_properties_work.work); | |
835 | struct tb_property_dir *dir; | |
836 | struct tb *tb = xd->tb; | |
837 | bool update = false; | |
838 | u32 *block = NULL; | |
839 | u32 gen = 0; | |
840 | int ret; | |
841 | ||
842 | ret = tb_xdp_properties_request(tb->ctl, xd->route, xd->local_uuid, | |
843 | xd->remote_uuid, xd->properties_retries, | |
844 | &block, &gen); | |
845 | if (ret < 0) { | |
846 | if (xd->properties_retries-- > 0) { | |
847 | queue_delayed_work(xd->tb->wq, &xd->get_properties_work, | |
848 | msecs_to_jiffies(1000)); | |
849 | } else { | |
850 | /* Give up now */ | |
851 | dev_err(&xd->dev, | |
852 | "failed read XDomain properties from %pUb\n", | |
853 | xd->remote_uuid); | |
854 | } | |
855 | return; | |
856 | } | |
857 | ||
858 | xd->properties_retries = XDOMAIN_PROPERTIES_RETRIES; | |
859 | ||
860 | mutex_lock(&xd->lock); | |
861 | ||
862 | /* Only accept newer generation properties */ | |
863 | if (xd->properties && gen <= xd->property_block_gen) { | |
864 | /* | |
865 | * On resume it is likely that the properties block is | |
866 | * not changed (unless the other end added or removed | |
867 | * services). However, we need to make sure the existing | |
868 | * DMA paths are restored properly. | |
869 | */ | |
870 | tb_xdomain_restore_paths(xd); | |
871 | goto err_free_block; | |
872 | } | |
873 | ||
874 | dir = tb_property_parse_dir(block, ret); | |
875 | if (!dir) { | |
876 | dev_err(&xd->dev, "failed to parse XDomain properties\n"); | |
877 | goto err_free_block; | |
878 | } | |
879 | ||
880 | ret = populate_properties(xd, dir); | |
881 | if (ret) { | |
882 | dev_err(&xd->dev, "missing XDomain properties in response\n"); | |
883 | goto err_free_dir; | |
884 | } | |
885 | ||
886 | /* Release the existing one */ | |
887 | if (xd->properties) { | |
888 | tb_property_free_dir(xd->properties); | |
889 | update = true; | |
890 | } | |
891 | ||
892 | xd->properties = dir; | |
893 | xd->property_block_gen = gen; | |
894 | ||
895 | tb_xdomain_restore_paths(xd); | |
896 | ||
897 | mutex_unlock(&xd->lock); | |
898 | ||
899 | kfree(block); | |
900 | ||
901 | /* | |
902 | * Now the device should be ready enough so we can add it to the | |
903 | * bus and let userspace know about it. If the device is already | |
904 | * registered, we notify the userspace that it has changed. | |
905 | */ | |
906 | if (!update) { | |
907 | if (device_add(&xd->dev)) { | |
908 | dev_err(&xd->dev, "failed to add XDomain device\n"); | |
909 | return; | |
910 | } | |
911 | } else { | |
912 | kobject_uevent(&xd->dev.kobj, KOBJ_CHANGE); | |
913 | } | |
914 | ||
915 | enumerate_services(xd); | |
916 | return; | |
917 | ||
918 | err_free_dir: | |
919 | tb_property_free_dir(dir); | |
920 | err_free_block: | |
921 | kfree(block); | |
922 | mutex_unlock(&xd->lock); | |
923 | } | |
924 | ||
925 | static void tb_xdomain_properties_changed(struct work_struct *work) | |
926 | { | |
927 | struct tb_xdomain *xd = container_of(work, typeof(*xd), | |
928 | properties_changed_work.work); | |
929 | int ret; | |
930 | ||
931 | ret = tb_xdp_properties_changed_request(xd->tb->ctl, xd->route, | |
932 | xd->properties_changed_retries, xd->local_uuid); | |
933 | if (ret) { | |
934 | if (xd->properties_changed_retries-- > 0) | |
935 | queue_delayed_work(xd->tb->wq, | |
936 | &xd->properties_changed_work, | |
937 | msecs_to_jiffies(1000)); | |
938 | return; | |
939 | } | |
940 | ||
941 | xd->properties_changed_retries = XDOMAIN_PROPERTIES_CHANGED_RETRIES; | |
942 | } | |
943 | ||
944 | static ssize_t device_show(struct device *dev, struct device_attribute *attr, | |
945 | char *buf) | |
946 | { | |
947 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
948 | ||
949 | return sprintf(buf, "%#x\n", xd->device); | |
950 | } | |
951 | static DEVICE_ATTR_RO(device); | |
952 | ||
953 | static ssize_t | |
954 | device_name_show(struct device *dev, struct device_attribute *attr, char *buf) | |
955 | { | |
956 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
957 | int ret; | |
958 | ||
959 | if (mutex_lock_interruptible(&xd->lock)) | |
960 | return -ERESTARTSYS; | |
961 | ret = sprintf(buf, "%s\n", xd->device_name ? xd->device_name : ""); | |
962 | mutex_unlock(&xd->lock); | |
963 | ||
964 | return ret; | |
965 | } | |
966 | static DEVICE_ATTR_RO(device_name); | |
967 | ||
968 | static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, | |
969 | char *buf) | |
970 | { | |
971 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
972 | ||
973 | return sprintf(buf, "%#x\n", xd->vendor); | |
974 | } | |
975 | static DEVICE_ATTR_RO(vendor); | |
976 | ||
977 | static ssize_t | |
978 | vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf) | |
979 | { | |
980 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
981 | int ret; | |
982 | ||
983 | if (mutex_lock_interruptible(&xd->lock)) | |
984 | return -ERESTARTSYS; | |
985 | ret = sprintf(buf, "%s\n", xd->vendor_name ? xd->vendor_name : ""); | |
986 | mutex_unlock(&xd->lock); | |
987 | ||
988 | return ret; | |
989 | } | |
990 | static DEVICE_ATTR_RO(vendor_name); | |
991 | ||
992 | static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr, | |
993 | char *buf) | |
994 | { | |
995 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
996 | ||
997 | return sprintf(buf, "%pUb\n", xd->remote_uuid); | |
998 | } | |
999 | static DEVICE_ATTR_RO(unique_id); | |
1000 | ||
1001 | static struct attribute *xdomain_attrs[] = { | |
1002 | &dev_attr_device.attr, | |
1003 | &dev_attr_device_name.attr, | |
1004 | &dev_attr_unique_id.attr, | |
1005 | &dev_attr_vendor.attr, | |
1006 | &dev_attr_vendor_name.attr, | |
1007 | NULL, | |
1008 | }; | |
1009 | ||
1010 | static struct attribute_group xdomain_attr_group = { | |
1011 | .attrs = xdomain_attrs, | |
1012 | }; | |
1013 | ||
1014 | static const struct attribute_group *xdomain_attr_groups[] = { | |
1015 | &xdomain_attr_group, | |
1016 | NULL, | |
1017 | }; | |
1018 | ||
1019 | static void tb_xdomain_release(struct device *dev) | |
1020 | { | |
1021 | struct tb_xdomain *xd = container_of(dev, struct tb_xdomain, dev); | |
1022 | ||
1023 | put_device(xd->dev.parent); | |
1024 | ||
1025 | tb_property_free_dir(xd->properties); | |
1026 | ida_destroy(&xd->service_ids); | |
1027 | ||
1028 | kfree(xd->local_uuid); | |
1029 | kfree(xd->remote_uuid); | |
1030 | kfree(xd->device_name); | |
1031 | kfree(xd->vendor_name); | |
1032 | kfree(xd); | |
1033 | } | |
1034 | ||
1035 | static void start_handshake(struct tb_xdomain *xd) | |
1036 | { | |
1037 | xd->properties_retries = XDOMAIN_PROPERTIES_RETRIES; | |
1038 | xd->properties_changed_retries = XDOMAIN_PROPERTIES_CHANGED_RETRIES; | |
1039 | ||
1040 | /* Start exchanging properties with the other host */ | |
1041 | queue_delayed_work(xd->tb->wq, &xd->properties_changed_work, | |
1042 | msecs_to_jiffies(100)); | |
1043 | queue_delayed_work(xd->tb->wq, &xd->get_properties_work, | |
1044 | msecs_to_jiffies(1000)); | |
1045 | } | |
1046 | ||
1047 | static void stop_handshake(struct tb_xdomain *xd) | |
1048 | { | |
1049 | xd->properties_retries = 0; | |
1050 | xd->properties_changed_retries = 0; | |
1051 | ||
1052 | cancel_delayed_work_sync(&xd->get_properties_work); | |
1053 | cancel_delayed_work_sync(&xd->properties_changed_work); | |
1054 | } | |
1055 | ||
1056 | static int __maybe_unused tb_xdomain_suspend(struct device *dev) | |
1057 | { | |
1058 | stop_handshake(tb_to_xdomain(dev)); | |
1059 | return 0; | |
1060 | } | |
1061 | ||
1062 | static int __maybe_unused tb_xdomain_resume(struct device *dev) | |
1063 | { | |
1064 | struct tb_xdomain *xd = tb_to_xdomain(dev); | |
1065 | ||
1066 | /* | |
1067 | * Ask tb_xdomain_get_properties() restore any existing DMA | |
1068 | * paths after properties are re-read. | |
1069 | */ | |
1070 | xd->resume = true; | |
1071 | start_handshake(xd); | |
1072 | ||
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | static const struct dev_pm_ops tb_xdomain_pm_ops = { | |
1077 | SET_SYSTEM_SLEEP_PM_OPS(tb_xdomain_suspend, tb_xdomain_resume) | |
1078 | }; | |
1079 | ||
1080 | struct device_type tb_xdomain_type = { | |
1081 | .name = "thunderbolt_xdomain", | |
1082 | .release = tb_xdomain_release, | |
1083 | .pm = &tb_xdomain_pm_ops, | |
1084 | }; | |
1085 | EXPORT_SYMBOL_GPL(tb_xdomain_type); | |
1086 | ||
1087 | /** | |
1088 | * tb_xdomain_alloc() - Allocate new XDomain object | |
1089 | * @tb: Domain where the XDomain belongs | |
1090 | * @parent: Parent device (the switch through the connection to the | |
1091 | * other domain is reached). | |
1092 | * @route: Route string used to reach the other domain | |
1093 | * @local_uuid: Our local domain UUID | |
1094 | * @remote_uuid: UUID of the other domain | |
1095 | * | |
1096 | * Allocates new XDomain structure and returns pointer to that. The | |
1097 | * object must be released by calling tb_xdomain_put(). | |
1098 | */ | |
1099 | struct tb_xdomain *tb_xdomain_alloc(struct tb *tb, struct device *parent, | |
1100 | u64 route, const uuid_t *local_uuid, | |
1101 | const uuid_t *remote_uuid) | |
1102 | { | |
1103 | struct tb_xdomain *xd; | |
1104 | ||
1105 | xd = kzalloc(sizeof(*xd), GFP_KERNEL); | |
1106 | if (!xd) | |
1107 | return NULL; | |
1108 | ||
1109 | xd->tb = tb; | |
1110 | xd->route = route; | |
1111 | ida_init(&xd->service_ids); | |
1112 | mutex_init(&xd->lock); | |
1113 | INIT_DELAYED_WORK(&xd->get_properties_work, tb_xdomain_get_properties); | |
1114 | INIT_DELAYED_WORK(&xd->properties_changed_work, | |
1115 | tb_xdomain_properties_changed); | |
1116 | ||
1117 | xd->local_uuid = kmemdup(local_uuid, sizeof(uuid_t), GFP_KERNEL); | |
1118 | if (!xd->local_uuid) | |
1119 | goto err_free; | |
1120 | ||
1121 | xd->remote_uuid = kmemdup(remote_uuid, sizeof(uuid_t), GFP_KERNEL); | |
1122 | if (!xd->remote_uuid) | |
1123 | goto err_free_local_uuid; | |
1124 | ||
1125 | device_initialize(&xd->dev); | |
1126 | xd->dev.parent = get_device(parent); | |
1127 | xd->dev.bus = &tb_bus_type; | |
1128 | xd->dev.type = &tb_xdomain_type; | |
1129 | xd->dev.groups = xdomain_attr_groups; | |
1130 | dev_set_name(&xd->dev, "%u-%llx", tb->index, route); | |
1131 | ||
1132 | return xd; | |
1133 | ||
1134 | err_free_local_uuid: | |
1135 | kfree(xd->local_uuid); | |
1136 | err_free: | |
1137 | kfree(xd); | |
1138 | ||
1139 | return NULL; | |
1140 | } | |
1141 | ||
1142 | /** | |
1143 | * tb_xdomain_add() - Add XDomain to the bus | |
1144 | * @xd: XDomain to add | |
1145 | * | |
1146 | * This function starts XDomain discovery protocol handshake and | |
1147 | * eventually adds the XDomain to the bus. After calling this function | |
1148 | * the caller needs to call tb_xdomain_remove() in order to remove and | |
1149 | * release the object regardless whether the handshake succeeded or not. | |
1150 | */ | |
1151 | void tb_xdomain_add(struct tb_xdomain *xd) | |
1152 | { | |
1153 | /* Start exchanging properties with the other host */ | |
1154 | start_handshake(xd); | |
1155 | } | |
1156 | ||
1157 | static int unregister_service(struct device *dev, void *data) | |
1158 | { | |
1159 | device_unregister(dev); | |
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | /** | |
1164 | * tb_xdomain_remove() - Remove XDomain from the bus | |
1165 | * @xd: XDomain to remove | |
1166 | * | |
1167 | * This will stop all ongoing configuration work and remove the XDomain | |
1168 | * along with any services from the bus. When the last reference to @xd | |
1169 | * is released the object will be released as well. | |
1170 | */ | |
1171 | void tb_xdomain_remove(struct tb_xdomain *xd) | |
1172 | { | |
1173 | stop_handshake(xd); | |
1174 | ||
1175 | device_for_each_child_reverse(&xd->dev, xd, unregister_service); | |
1176 | ||
1177 | if (!device_is_registered(&xd->dev)) | |
1178 | put_device(&xd->dev); | |
1179 | else | |
1180 | device_unregister(&xd->dev); | |
1181 | } | |
1182 | ||
1183 | /** | |
1184 | * tb_xdomain_enable_paths() - Enable DMA paths for XDomain connection | |
1185 | * @xd: XDomain connection | |
1186 | * @transmit_path: HopID of the transmit path the other end is using to | |
1187 | * send packets | |
1188 | * @transmit_ring: DMA ring used to receive packets from the other end | |
1189 | * @receive_path: HopID of the receive path the other end is using to | |
1190 | * receive packets | |
1191 | * @receive_ring: DMA ring used to send packets to the other end | |
1192 | * | |
1193 | * The function enables DMA paths accordingly so that after successful | |
1194 | * return the caller can send and receive packets using high-speed DMA | |
1195 | * path. | |
1196 | * | |
1197 | * Return: %0 in case of success and negative errno in case of error | |
1198 | */ | |
1199 | int tb_xdomain_enable_paths(struct tb_xdomain *xd, u16 transmit_path, | |
1200 | u16 transmit_ring, u16 receive_path, | |
1201 | u16 receive_ring) | |
1202 | { | |
1203 | int ret; | |
1204 | ||
1205 | mutex_lock(&xd->lock); | |
1206 | ||
1207 | if (xd->transmit_path) { | |
1208 | ret = xd->transmit_path == transmit_path ? 0 : -EBUSY; | |
1209 | goto exit_unlock; | |
1210 | } | |
1211 | ||
1212 | xd->transmit_path = transmit_path; | |
1213 | xd->transmit_ring = transmit_ring; | |
1214 | xd->receive_path = receive_path; | |
1215 | xd->receive_ring = receive_ring; | |
1216 | ||
1217 | ret = tb_domain_approve_xdomain_paths(xd->tb, xd); | |
1218 | ||
1219 | exit_unlock: | |
1220 | mutex_unlock(&xd->lock); | |
1221 | ||
1222 | return ret; | |
1223 | } | |
1224 | EXPORT_SYMBOL_GPL(tb_xdomain_enable_paths); | |
1225 | ||
1226 | /** | |
1227 | * tb_xdomain_disable_paths() - Disable DMA paths for XDomain connection | |
1228 | * @xd: XDomain connection | |
1229 | * | |
1230 | * This does the opposite of tb_xdomain_enable_paths(). After call to | |
1231 | * this the caller is not expected to use the rings anymore. | |
1232 | * | |
1233 | * Return: %0 in case of success and negative errno in case of error | |
1234 | */ | |
1235 | int tb_xdomain_disable_paths(struct tb_xdomain *xd) | |
1236 | { | |
1237 | int ret = 0; | |
1238 | ||
1239 | mutex_lock(&xd->lock); | |
1240 | if (xd->transmit_path) { | |
1241 | xd->transmit_path = 0; | |
1242 | xd->transmit_ring = 0; | |
1243 | xd->receive_path = 0; | |
1244 | xd->receive_ring = 0; | |
1245 | ||
1246 | ret = tb_domain_disconnect_xdomain_paths(xd->tb, xd); | |
1247 | } | |
1248 | mutex_unlock(&xd->lock); | |
1249 | ||
1250 | return ret; | |
1251 | } | |
1252 | EXPORT_SYMBOL_GPL(tb_xdomain_disable_paths); | |
1253 | ||
1254 | struct tb_xdomain_lookup { | |
1255 | const uuid_t *uuid; | |
1256 | u8 link; | |
1257 | u8 depth; | |
484cb153 | 1258 | u64 route; |
d1ff7024 MW |
1259 | }; |
1260 | ||
1261 | static struct tb_xdomain *switch_find_xdomain(struct tb_switch *sw, | |
1262 | const struct tb_xdomain_lookup *lookup) | |
1263 | { | |
1264 | int i; | |
1265 | ||
1266 | for (i = 1; i <= sw->config.max_port_number; i++) { | |
1267 | struct tb_port *port = &sw->ports[i]; | |
1268 | struct tb_xdomain *xd; | |
1269 | ||
1270 | if (tb_is_upstream_port(port)) | |
1271 | continue; | |
1272 | ||
1273 | if (port->xdomain) { | |
1274 | xd = port->xdomain; | |
1275 | ||
1276 | if (lookup->uuid) { | |
1277 | if (uuid_equal(xd->remote_uuid, lookup->uuid)) | |
1278 | return xd; | |
484cb153 RM |
1279 | } else if (lookup->link && |
1280 | lookup->link == xd->link && | |
d1ff7024 MW |
1281 | lookup->depth == xd->depth) { |
1282 | return xd; | |
484cb153 RM |
1283 | } else if (lookup->route && |
1284 | lookup->route == xd->route) { | |
1285 | return xd; | |
d1ff7024 MW |
1286 | } |
1287 | } else if (port->remote) { | |
1288 | xd = switch_find_xdomain(port->remote->sw, lookup); | |
1289 | if (xd) | |
1290 | return xd; | |
1291 | } | |
1292 | } | |
1293 | ||
1294 | return NULL; | |
1295 | } | |
1296 | ||
1297 | /** | |
1298 | * tb_xdomain_find_by_uuid() - Find an XDomain by UUID | |
1299 | * @tb: Domain where the XDomain belongs to | |
1300 | * @uuid: UUID to look for | |
1301 | * | |
1302 | * Finds XDomain by walking through the Thunderbolt topology below @tb. | |
1303 | * The returned XDomain will have its reference count increased so the | |
1304 | * caller needs to call tb_xdomain_put() when it is done with the | |
1305 | * object. | |
1306 | * | |
1307 | * This will find all XDomains including the ones that are not yet added | |
1308 | * to the bus (handshake is still in progress). | |
1309 | * | |
1310 | * The caller needs to hold @tb->lock. | |
1311 | */ | |
1312 | struct tb_xdomain *tb_xdomain_find_by_uuid(struct tb *tb, const uuid_t *uuid) | |
1313 | { | |
1314 | struct tb_xdomain_lookup lookup; | |
1315 | struct tb_xdomain *xd; | |
1316 | ||
1317 | memset(&lookup, 0, sizeof(lookup)); | |
1318 | lookup.uuid = uuid; | |
1319 | ||
1320 | xd = switch_find_xdomain(tb->root_switch, &lookup); | |
484cb153 | 1321 | return tb_xdomain_get(xd); |
d1ff7024 MW |
1322 | } |
1323 | EXPORT_SYMBOL_GPL(tb_xdomain_find_by_uuid); | |
1324 | ||
1325 | /** | |
1326 | * tb_xdomain_find_by_link_depth() - Find an XDomain by link and depth | |
1327 | * @tb: Domain where the XDomain belongs to | |
1328 | * @link: Root switch link number | |
1329 | * @depth: Depth in the link | |
1330 | * | |
1331 | * Finds XDomain by walking through the Thunderbolt topology below @tb. | |
1332 | * The returned XDomain will have its reference count increased so the | |
1333 | * caller needs to call tb_xdomain_put() when it is done with the | |
1334 | * object. | |
1335 | * | |
1336 | * This will find all XDomains including the ones that are not yet added | |
1337 | * to the bus (handshake is still in progress). | |
1338 | * | |
1339 | * The caller needs to hold @tb->lock. | |
1340 | */ | |
1341 | struct tb_xdomain *tb_xdomain_find_by_link_depth(struct tb *tb, u8 link, | |
1342 | u8 depth) | |
1343 | { | |
1344 | struct tb_xdomain_lookup lookup; | |
1345 | struct tb_xdomain *xd; | |
1346 | ||
1347 | memset(&lookup, 0, sizeof(lookup)); | |
1348 | lookup.link = link; | |
1349 | lookup.depth = depth; | |
1350 | ||
1351 | xd = switch_find_xdomain(tb->root_switch, &lookup); | |
484cb153 RM |
1352 | return tb_xdomain_get(xd); |
1353 | } | |
d1ff7024 | 1354 | |
484cb153 RM |
1355 | /** |
1356 | * tb_xdomain_find_by_route() - Find an XDomain by route string | |
1357 | * @tb: Domain where the XDomain belongs to | |
1358 | * @route: XDomain route string | |
1359 | * | |
1360 | * Finds XDomain by walking through the Thunderbolt topology below @tb. | |
1361 | * The returned XDomain will have its reference count increased so the | |
1362 | * caller needs to call tb_xdomain_put() when it is done with the | |
1363 | * object. | |
1364 | * | |
1365 | * This will find all XDomains including the ones that are not yet added | |
1366 | * to the bus (handshake is still in progress). | |
1367 | * | |
1368 | * The caller needs to hold @tb->lock. | |
1369 | */ | |
1370 | struct tb_xdomain *tb_xdomain_find_by_route(struct tb *tb, u64 route) | |
1371 | { | |
1372 | struct tb_xdomain_lookup lookup; | |
1373 | struct tb_xdomain *xd; | |
1374 | ||
1375 | memset(&lookup, 0, sizeof(lookup)); | |
1376 | lookup.route = route; | |
1377 | ||
1378 | xd = switch_find_xdomain(tb->root_switch, &lookup); | |
1379 | return tb_xdomain_get(xd); | |
d1ff7024 | 1380 | } |
484cb153 | 1381 | EXPORT_SYMBOL_GPL(tb_xdomain_find_by_route); |
d1ff7024 MW |
1382 | |
1383 | bool tb_xdomain_handle_request(struct tb *tb, enum tb_cfg_pkg_type type, | |
1384 | const void *buf, size_t size) | |
1385 | { | |
1386 | const struct tb_protocol_handler *handler, *tmp; | |
1387 | const struct tb_xdp_header *hdr = buf; | |
1388 | unsigned int length; | |
1389 | int ret = 0; | |
1390 | ||
1391 | /* We expect the packet is at least size of the header */ | |
1392 | length = hdr->xd_hdr.length_sn & TB_XDOMAIN_LENGTH_MASK; | |
1393 | if (length != size / 4 - sizeof(hdr->xd_hdr) / 4) | |
1394 | return true; | |
1395 | if (length < sizeof(*hdr) / 4 - sizeof(hdr->xd_hdr) / 4) | |
1396 | return true; | |
1397 | ||
1398 | /* | |
1399 | * Handle XDomain discovery protocol packets directly here. For | |
1400 | * other protocols (based on their UUID) we call registered | |
1401 | * handlers in turn. | |
1402 | */ | |
1403 | if (uuid_equal(&hdr->uuid, &tb_xdp_uuid)) { | |
1404 | if (type == TB_CFG_PKG_XDOMAIN_REQ) { | |
1405 | tb_xdp_schedule_request(tb, hdr, size); | |
1406 | return true; | |
1407 | } | |
1408 | return false; | |
1409 | } | |
1410 | ||
1411 | mutex_lock(&xdomain_lock); | |
1412 | list_for_each_entry_safe(handler, tmp, &protocol_handlers, list) { | |
1413 | if (!uuid_equal(&hdr->uuid, handler->uuid)) | |
1414 | continue; | |
1415 | ||
1416 | mutex_unlock(&xdomain_lock); | |
1417 | ret = handler->callback(buf, size, handler->data); | |
1418 | mutex_lock(&xdomain_lock); | |
1419 | ||
1420 | if (ret) | |
1421 | break; | |
1422 | } | |
1423 | mutex_unlock(&xdomain_lock); | |
1424 | ||
1425 | return ret > 0; | |
1426 | } | |
1427 | ||
1428 | static int rebuild_property_block(void) | |
1429 | { | |
1430 | u32 *block, len; | |
1431 | int ret; | |
1432 | ||
1433 | ret = tb_property_format_dir(xdomain_property_dir, NULL, 0); | |
1434 | if (ret < 0) | |
1435 | return ret; | |
1436 | ||
1437 | len = ret; | |
1438 | ||
1439 | block = kcalloc(len, sizeof(u32), GFP_KERNEL); | |
1440 | if (!block) | |
1441 | return -ENOMEM; | |
1442 | ||
1443 | ret = tb_property_format_dir(xdomain_property_dir, block, len); | |
1444 | if (ret) { | |
1445 | kfree(block); | |
1446 | return ret; | |
1447 | } | |
1448 | ||
1449 | kfree(xdomain_property_block); | |
1450 | xdomain_property_block = block; | |
1451 | xdomain_property_block_len = len; | |
1452 | xdomain_property_block_gen++; | |
1453 | ||
1454 | return 0; | |
1455 | } | |
1456 | ||
1457 | static int update_xdomain(struct device *dev, void *data) | |
1458 | { | |
1459 | struct tb_xdomain *xd; | |
1460 | ||
1461 | xd = tb_to_xdomain(dev); | |
1462 | if (xd) { | |
1463 | queue_delayed_work(xd->tb->wq, &xd->properties_changed_work, | |
1464 | msecs_to_jiffies(50)); | |
1465 | } | |
1466 | ||
1467 | return 0; | |
1468 | } | |
1469 | ||
1470 | static void update_all_xdomains(void) | |
1471 | { | |
1472 | bus_for_each_dev(&tb_bus_type, NULL, NULL, update_xdomain); | |
1473 | } | |
1474 | ||
1475 | static bool remove_directory(const char *key, const struct tb_property_dir *dir) | |
1476 | { | |
1477 | struct tb_property *p; | |
1478 | ||
1479 | p = tb_property_find(xdomain_property_dir, key, | |
1480 | TB_PROPERTY_TYPE_DIRECTORY); | |
1481 | if (p && p->value.dir == dir) { | |
1482 | tb_property_remove(p); | |
1483 | return true; | |
1484 | } | |
1485 | return false; | |
1486 | } | |
1487 | ||
1488 | /** | |
1489 | * tb_register_property_dir() - Register property directory to the host | |
1490 | * @key: Key (name) of the directory to add | |
1491 | * @dir: Directory to add | |
1492 | * | |
1493 | * Service drivers can use this function to add new property directory | |
1494 | * to the host available properties. The other connected hosts are | |
1495 | * notified so they can re-read properties of this host if they are | |
1496 | * interested. | |
1497 | * | |
1498 | * Return: %0 on success and negative errno on failure | |
1499 | */ | |
1500 | int tb_register_property_dir(const char *key, struct tb_property_dir *dir) | |
1501 | { | |
1502 | int ret; | |
1503 | ||
acb40d84 MW |
1504 | if (WARN_ON(!xdomain_property_dir)) |
1505 | return -EAGAIN; | |
1506 | ||
d1ff7024 MW |
1507 | if (!key || strlen(key) > 8) |
1508 | return -EINVAL; | |
1509 | ||
1510 | mutex_lock(&xdomain_lock); | |
1511 | if (tb_property_find(xdomain_property_dir, key, | |
1512 | TB_PROPERTY_TYPE_DIRECTORY)) { | |
1513 | ret = -EEXIST; | |
1514 | goto err_unlock; | |
1515 | } | |
1516 | ||
1517 | ret = tb_property_add_dir(xdomain_property_dir, key, dir); | |
1518 | if (ret) | |
1519 | goto err_unlock; | |
1520 | ||
1521 | ret = rebuild_property_block(); | |
1522 | if (ret) { | |
1523 | remove_directory(key, dir); | |
1524 | goto err_unlock; | |
1525 | } | |
1526 | ||
1527 | mutex_unlock(&xdomain_lock); | |
1528 | update_all_xdomains(); | |
1529 | return 0; | |
1530 | ||
1531 | err_unlock: | |
1532 | mutex_unlock(&xdomain_lock); | |
1533 | return ret; | |
1534 | } | |
1535 | EXPORT_SYMBOL_GPL(tb_register_property_dir); | |
1536 | ||
1537 | /** | |
1538 | * tb_unregister_property_dir() - Removes property directory from host | |
1539 | * @key: Key (name) of the directory | |
1540 | * @dir: Directory to remove | |
1541 | * | |
1542 | * This will remove the existing directory from this host and notify the | |
1543 | * connected hosts about the change. | |
1544 | */ | |
1545 | void tb_unregister_property_dir(const char *key, struct tb_property_dir *dir) | |
1546 | { | |
1547 | int ret = 0; | |
1548 | ||
1549 | mutex_lock(&xdomain_lock); | |
1550 | if (remove_directory(key, dir)) | |
1551 | ret = rebuild_property_block(); | |
1552 | mutex_unlock(&xdomain_lock); | |
1553 | ||
1554 | if (!ret) | |
1555 | update_all_xdomains(); | |
1556 | } | |
1557 | EXPORT_SYMBOL_GPL(tb_unregister_property_dir); | |
1558 | ||
1559 | int tb_xdomain_init(void) | |
1560 | { | |
1561 | int ret; | |
1562 | ||
1563 | xdomain_property_dir = tb_property_create_dir(NULL); | |
1564 | if (!xdomain_property_dir) | |
1565 | return -ENOMEM; | |
1566 | ||
1567 | /* | |
1568 | * Initialize standard set of properties without any service | |
1569 | * directories. Those will be added by service drivers | |
1570 | * themselves when they are loaded. | |
1571 | */ | |
1572 | tb_property_add_immediate(xdomain_property_dir, "vendorid", | |
1573 | PCI_VENDOR_ID_INTEL); | |
1574 | tb_property_add_text(xdomain_property_dir, "vendorid", "Intel Corp."); | |
1575 | tb_property_add_immediate(xdomain_property_dir, "deviceid", 0x1); | |
1576 | tb_property_add_text(xdomain_property_dir, "deviceid", | |
1577 | utsname()->nodename); | |
1578 | tb_property_add_immediate(xdomain_property_dir, "devicerv", 0x80000100); | |
1579 | ||
1580 | ret = rebuild_property_block(); | |
1581 | if (ret) { | |
1582 | tb_property_free_dir(xdomain_property_dir); | |
1583 | xdomain_property_dir = NULL; | |
1584 | } | |
1585 | ||
1586 | return ret; | |
1587 | } | |
1588 | ||
1589 | void tb_xdomain_exit(void) | |
1590 | { | |
1591 | kfree(xdomain_property_block); | |
1592 | tb_property_free_dir(xdomain_property_dir); | |
1593 | } |