Commit | Line | Data |
---|---|---|
ab841160 OW |
1 | /* |
2 | * | |
3 | * Intel Management Engine Interface (Intel MEI) Linux driver | |
733ba91c | 4 | * Copyright (c) 2003-2012, Intel Corporation. |
ab841160 OW |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | */ | |
16 | ||
ab841160 | 17 | #include <linux/sched.h> |
9ca9050b TW |
18 | #include <linux/wait.h> |
19 | #include <linux/delay.h> | |
1f180359 | 20 | #include <linux/slab.h> |
04bb139a | 21 | #include <linux/pm_runtime.h> |
ab841160 | 22 | |
4f3afe1d | 23 | #include <linux/mei.h> |
47a73801 TW |
24 | |
25 | #include "mei_dev.h" | |
0edb23fc | 26 | #include "hbm.h" |
90e0b5f1 TW |
27 | #include "client.h" |
28 | ||
79563db9 TW |
29 | /** |
30 | * mei_me_cl_init - initialize me client | |
31 | * | |
32 | * @me_cl: me client | |
33 | */ | |
34 | void mei_me_cl_init(struct mei_me_client *me_cl) | |
35 | { | |
36 | INIT_LIST_HEAD(&me_cl->list); | |
37 | kref_init(&me_cl->refcnt); | |
38 | } | |
39 | ||
40 | /** | |
41 | * mei_me_cl_get - increases me client refcount | |
42 | * | |
43 | * @me_cl: me client | |
44 | * | |
45 | * Locking: called under "dev->device_lock" lock | |
46 | * | |
47 | * Return: me client or NULL | |
48 | */ | |
49 | struct mei_me_client *mei_me_cl_get(struct mei_me_client *me_cl) | |
50 | { | |
b7d88514 TW |
51 | if (me_cl && kref_get_unless_zero(&me_cl->refcnt)) |
52 | return me_cl; | |
79563db9 | 53 | |
b7d88514 | 54 | return NULL; |
79563db9 TW |
55 | } |
56 | ||
57 | /** | |
b7d88514 | 58 | * mei_me_cl_release - free me client |
79563db9 TW |
59 | * |
60 | * Locking: called under "dev->device_lock" lock | |
61 | * | |
62 | * @ref: me_client refcount | |
63 | */ | |
64 | static void mei_me_cl_release(struct kref *ref) | |
65 | { | |
66 | struct mei_me_client *me_cl = | |
67 | container_of(ref, struct mei_me_client, refcnt); | |
b7d88514 | 68 | |
79563db9 TW |
69 | kfree(me_cl); |
70 | } | |
b7d88514 | 71 | |
79563db9 TW |
72 | /** |
73 | * mei_me_cl_put - decrease me client refcount and free client if necessary | |
74 | * | |
75 | * Locking: called under "dev->device_lock" lock | |
76 | * | |
77 | * @me_cl: me client | |
78 | */ | |
79 | void mei_me_cl_put(struct mei_me_client *me_cl) | |
80 | { | |
81 | if (me_cl) | |
82 | kref_put(&me_cl->refcnt, mei_me_cl_release); | |
83 | } | |
84 | ||
90e0b5f1 | 85 | /** |
d49ed64a | 86 | * __mei_me_cl_del - delete me client from the list and decrease |
b7d88514 TW |
87 | * reference counter |
88 | * | |
89 | * @dev: mei device | |
90 | * @me_cl: me client | |
91 | * | |
92 | * Locking: dev->me_clients_rwsem | |
93 | */ | |
94 | static void __mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl) | |
95 | { | |
96 | if (!me_cl) | |
97 | return; | |
98 | ||
d49ed64a | 99 | list_del_init(&me_cl->list); |
b7d88514 TW |
100 | mei_me_cl_put(me_cl); |
101 | } | |
102 | ||
d49ed64a AU |
103 | /** |
104 | * mei_me_cl_del - delete me client from the list and decrease | |
105 | * reference counter | |
106 | * | |
107 | * @dev: mei device | |
108 | * @me_cl: me client | |
109 | */ | |
110 | void mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl) | |
111 | { | |
112 | down_write(&dev->me_clients_rwsem); | |
113 | __mei_me_cl_del(dev, me_cl); | |
114 | up_write(&dev->me_clients_rwsem); | |
115 | } | |
116 | ||
b7d88514 TW |
117 | /** |
118 | * mei_me_cl_add - add me client to the list | |
119 | * | |
120 | * @dev: mei device | |
121 | * @me_cl: me client | |
122 | */ | |
123 | void mei_me_cl_add(struct mei_device *dev, struct mei_me_client *me_cl) | |
124 | { | |
125 | down_write(&dev->me_clients_rwsem); | |
126 | list_add(&me_cl->list, &dev->me_clients); | |
127 | up_write(&dev->me_clients_rwsem); | |
128 | } | |
129 | ||
130 | /** | |
131 | * __mei_me_cl_by_uuid - locate me client by uuid | |
79563db9 | 132 | * increases ref count |
90e0b5f1 TW |
133 | * |
134 | * @dev: mei device | |
a8605ea2 | 135 | * @uuid: me client uuid |
a27a76d3 | 136 | * |
a8605ea2 | 137 | * Return: me client or NULL if not found |
b7d88514 TW |
138 | * |
139 | * Locking: dev->me_clients_rwsem | |
90e0b5f1 | 140 | */ |
b7d88514 | 141 | static struct mei_me_client *__mei_me_cl_by_uuid(struct mei_device *dev, |
d320832f | 142 | const uuid_le *uuid) |
90e0b5f1 | 143 | { |
5ca2d388 | 144 | struct mei_me_client *me_cl; |
b7d88514 | 145 | const uuid_le *pn; |
90e0b5f1 | 146 | |
b7d88514 TW |
147 | WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem)); |
148 | ||
149 | list_for_each_entry(me_cl, &dev->me_clients, list) { | |
150 | pn = &me_cl->props.protocol_name; | |
151 | if (uuid_le_cmp(*uuid, *pn) == 0) | |
79563db9 | 152 | return mei_me_cl_get(me_cl); |
b7d88514 | 153 | } |
90e0b5f1 | 154 | |
d320832f | 155 | return NULL; |
90e0b5f1 TW |
156 | } |
157 | ||
b7d88514 TW |
158 | /** |
159 | * mei_me_cl_by_uuid - locate me client by uuid | |
160 | * increases ref count | |
161 | * | |
162 | * @dev: mei device | |
163 | * @uuid: me client uuid | |
164 | * | |
165 | * Return: me client or NULL if not found | |
166 | * | |
167 | * Locking: dev->me_clients_rwsem | |
168 | */ | |
169 | struct mei_me_client *mei_me_cl_by_uuid(struct mei_device *dev, | |
170 | const uuid_le *uuid) | |
171 | { | |
172 | struct mei_me_client *me_cl; | |
173 | ||
174 | down_read(&dev->me_clients_rwsem); | |
175 | me_cl = __mei_me_cl_by_uuid(dev, uuid); | |
176 | up_read(&dev->me_clients_rwsem); | |
177 | ||
178 | return me_cl; | |
179 | } | |
180 | ||
90e0b5f1 | 181 | /** |
a8605ea2 | 182 | * mei_me_cl_by_id - locate me client by client id |
79563db9 | 183 | * increases ref count |
90e0b5f1 TW |
184 | * |
185 | * @dev: the device structure | |
186 | * @client_id: me client id | |
187 | * | |
a8605ea2 | 188 | * Return: me client or NULL if not found |
b7d88514 TW |
189 | * |
190 | * Locking: dev->me_clients_rwsem | |
90e0b5f1 | 191 | */ |
d320832f | 192 | struct mei_me_client *mei_me_cl_by_id(struct mei_device *dev, u8 client_id) |
90e0b5f1 | 193 | { |
a27a76d3 | 194 | |
b7d88514 TW |
195 | struct mei_me_client *__me_cl, *me_cl = NULL; |
196 | ||
197 | down_read(&dev->me_clients_rwsem); | |
198 | list_for_each_entry(__me_cl, &dev->me_clients, list) { | |
199 | if (__me_cl->client_id == client_id) { | |
200 | me_cl = mei_me_cl_get(__me_cl); | |
201 | break; | |
202 | } | |
203 | } | |
204 | up_read(&dev->me_clients_rwsem); | |
205 | ||
206 | return me_cl; | |
207 | } | |
208 | ||
209 | /** | |
210 | * __mei_me_cl_by_uuid_id - locate me client by client id and uuid | |
211 | * increases ref count | |
212 | * | |
213 | * @dev: the device structure | |
214 | * @uuid: me client uuid | |
215 | * @client_id: me client id | |
216 | * | |
217 | * Return: me client or null if not found | |
218 | * | |
219 | * Locking: dev->me_clients_rwsem | |
220 | */ | |
221 | static struct mei_me_client *__mei_me_cl_by_uuid_id(struct mei_device *dev, | |
222 | const uuid_le *uuid, u8 client_id) | |
223 | { | |
5ca2d388 | 224 | struct mei_me_client *me_cl; |
b7d88514 TW |
225 | const uuid_le *pn; |
226 | ||
227 | WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem)); | |
90e0b5f1 | 228 | |
b7d88514 TW |
229 | list_for_each_entry(me_cl, &dev->me_clients, list) { |
230 | pn = &me_cl->props.protocol_name; | |
231 | if (uuid_le_cmp(*uuid, *pn) == 0 && | |
232 | me_cl->client_id == client_id) | |
79563db9 | 233 | return mei_me_cl_get(me_cl); |
b7d88514 | 234 | } |
79563db9 | 235 | |
d320832f | 236 | return NULL; |
90e0b5f1 | 237 | } |
ab841160 | 238 | |
b7d88514 | 239 | |
a8605ea2 AU |
240 | /** |
241 | * mei_me_cl_by_uuid_id - locate me client by client id and uuid | |
79563db9 | 242 | * increases ref count |
a8605ea2 AU |
243 | * |
244 | * @dev: the device structure | |
245 | * @uuid: me client uuid | |
246 | * @client_id: me client id | |
247 | * | |
b7d88514 | 248 | * Return: me client or null if not found |
a8605ea2 | 249 | */ |
d880f329 TW |
250 | struct mei_me_client *mei_me_cl_by_uuid_id(struct mei_device *dev, |
251 | const uuid_le *uuid, u8 client_id) | |
252 | { | |
253 | struct mei_me_client *me_cl; | |
254 | ||
b7d88514 TW |
255 | down_read(&dev->me_clients_rwsem); |
256 | me_cl = __mei_me_cl_by_uuid_id(dev, uuid, client_id); | |
257 | up_read(&dev->me_clients_rwsem); | |
79563db9 | 258 | |
b7d88514 | 259 | return me_cl; |
d880f329 TW |
260 | } |
261 | ||
25ca6472 | 262 | /** |
79563db9 | 263 | * mei_me_cl_rm_by_uuid - remove all me clients matching uuid |
25ca6472 TW |
264 | * |
265 | * @dev: the device structure | |
266 | * @uuid: me client uuid | |
79563db9 TW |
267 | * |
268 | * Locking: called under "dev->device_lock" lock | |
25ca6472 | 269 | */ |
79563db9 | 270 | void mei_me_cl_rm_by_uuid(struct mei_device *dev, const uuid_le *uuid) |
25ca6472 | 271 | { |
b7d88514 | 272 | struct mei_me_client *me_cl; |
25ca6472 | 273 | |
79563db9 | 274 | dev_dbg(dev->dev, "remove %pUl\n", uuid); |
b7d88514 TW |
275 | |
276 | down_write(&dev->me_clients_rwsem); | |
277 | me_cl = __mei_me_cl_by_uuid(dev, uuid); | |
278 | __mei_me_cl_del(dev, me_cl); | |
279 | up_write(&dev->me_clients_rwsem); | |
79563db9 TW |
280 | } |
281 | ||
282 | /** | |
283 | * mei_me_cl_rm_by_uuid_id - remove all me clients matching client id | |
284 | * | |
285 | * @dev: the device structure | |
286 | * @uuid: me client uuid | |
287 | * @id: me client id | |
288 | * | |
289 | * Locking: called under "dev->device_lock" lock | |
290 | */ | |
291 | void mei_me_cl_rm_by_uuid_id(struct mei_device *dev, const uuid_le *uuid, u8 id) | |
292 | { | |
b7d88514 | 293 | struct mei_me_client *me_cl; |
79563db9 TW |
294 | |
295 | dev_dbg(dev->dev, "remove %pUl %d\n", uuid, id); | |
b7d88514 TW |
296 | |
297 | down_write(&dev->me_clients_rwsem); | |
298 | me_cl = __mei_me_cl_by_uuid_id(dev, uuid, id); | |
299 | __mei_me_cl_del(dev, me_cl); | |
300 | up_write(&dev->me_clients_rwsem); | |
25ca6472 TW |
301 | } |
302 | ||
79563db9 TW |
303 | /** |
304 | * mei_me_cl_rm_all - remove all me clients | |
305 | * | |
306 | * @dev: the device structure | |
307 | * | |
308 | * Locking: called under "dev->device_lock" lock | |
309 | */ | |
310 | void mei_me_cl_rm_all(struct mei_device *dev) | |
311 | { | |
312 | struct mei_me_client *me_cl, *next; | |
313 | ||
b7d88514 | 314 | down_write(&dev->me_clients_rwsem); |
79563db9 | 315 | list_for_each_entry_safe(me_cl, next, &dev->me_clients, list) |
b7d88514 TW |
316 | __mei_me_cl_del(dev, me_cl); |
317 | up_write(&dev->me_clients_rwsem); | |
79563db9 TW |
318 | } |
319 | ||
9ca9050b | 320 | /** |
cc99ecfd | 321 | * mei_cl_cmp_id - tells if the clients are the same |
9ca9050b | 322 | * |
cc99ecfd TW |
323 | * @cl1: host client 1 |
324 | * @cl2: host client 2 | |
325 | * | |
a8605ea2 | 326 | * Return: true - if the clients has same host and me ids |
cc99ecfd TW |
327 | * false - otherwise |
328 | */ | |
329 | static inline bool mei_cl_cmp_id(const struct mei_cl *cl1, | |
330 | const struct mei_cl *cl2) | |
331 | { | |
332 | return cl1 && cl2 && | |
333 | (cl1->host_client_id == cl2->host_client_id) && | |
d49ed64a | 334 | (mei_cl_me_id(cl1) == mei_cl_me_id(cl2)); |
cc99ecfd TW |
335 | } |
336 | ||
928fa666 TW |
337 | /** |
338 | * mei_io_cb_free - free mei_cb_private related memory | |
339 | * | |
340 | * @cb: mei callback struct | |
341 | */ | |
342 | void mei_io_cb_free(struct mei_cl_cb *cb) | |
343 | { | |
344 | if (cb == NULL) | |
345 | return; | |
346 | ||
347 | list_del(&cb->list); | |
348 | kfree(cb->buf.data); | |
349 | kfree(cb); | |
350 | } | |
351 | ||
352 | /** | |
353 | * mei_io_cb_init - allocate and initialize io callback | |
354 | * | |
355 | * @cl: mei client | |
356 | * @type: operation type | |
357 | * @fp: pointer to file structure | |
358 | * | |
359 | * Return: mei_cl_cb pointer or NULL; | |
360 | */ | |
361 | struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, enum mei_cb_file_ops type, | |
362 | struct file *fp) | |
363 | { | |
364 | struct mei_cl_cb *cb; | |
365 | ||
366 | cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL); | |
367 | if (!cb) | |
368 | return NULL; | |
369 | ||
370 | INIT_LIST_HEAD(&cb->list); | |
371 | cb->file_object = fp; | |
372 | cb->cl = cl; | |
373 | cb->buf_idx = 0; | |
374 | cb->fop_type = type; | |
375 | return cb; | |
376 | } | |
377 | ||
cc99ecfd | 378 | /** |
3908be6f | 379 | * __mei_io_list_flush - removes and frees cbs belonging to cl. |
cc99ecfd TW |
380 | * |
381 | * @list: an instance of our list structure | |
382 | * @cl: host client, can be NULL for flushing the whole list | |
383 | * @free: whether to free the cbs | |
9ca9050b | 384 | */ |
cc99ecfd TW |
385 | static void __mei_io_list_flush(struct mei_cl_cb *list, |
386 | struct mei_cl *cl, bool free) | |
9ca9050b | 387 | { |
928fa666 | 388 | struct mei_cl_cb *cb, *next; |
9ca9050b | 389 | |
cc99ecfd | 390 | /* enable removing everything if no cl is specified */ |
9ca9050b | 391 | list_for_each_entry_safe(cb, next, &list->list, list) { |
140c7553 | 392 | if (!cl || mei_cl_cmp_id(cl, cb->cl)) { |
928fa666 | 393 | list_del_init(&cb->list); |
cc99ecfd TW |
394 | if (free) |
395 | mei_io_cb_free(cb); | |
396 | } | |
9ca9050b TW |
397 | } |
398 | } | |
399 | ||
cc99ecfd TW |
400 | /** |
401 | * mei_io_list_flush - removes list entry belonging to cl. | |
402 | * | |
403 | * @list: An instance of our list structure | |
404 | * @cl: host client | |
405 | */ | |
5456796b | 406 | void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl) |
cc99ecfd TW |
407 | { |
408 | __mei_io_list_flush(list, cl, false); | |
409 | } | |
410 | ||
cc99ecfd TW |
411 | /** |
412 | * mei_io_list_free - removes cb belonging to cl and free them | |
413 | * | |
414 | * @list: An instance of our list structure | |
415 | * @cl: host client | |
416 | */ | |
417 | static inline void mei_io_list_free(struct mei_cl_cb *list, struct mei_cl *cl) | |
418 | { | |
419 | __mei_io_list_flush(list, cl, true); | |
420 | } | |
421 | ||
664df38b | 422 | /** |
5db7514d | 423 | * mei_io_cb_alloc_buf - allocate callback buffer |
664df38b | 424 | * |
393b148f MI |
425 | * @cb: io callback structure |
426 | * @length: size of the buffer | |
664df38b | 427 | * |
a8605ea2 | 428 | * Return: 0 on success |
664df38b TW |
429 | * -EINVAL if cb is NULL |
430 | * -ENOMEM if allocation failed | |
431 | */ | |
5db7514d | 432 | int mei_io_cb_alloc_buf(struct mei_cl_cb *cb, size_t length) |
664df38b TW |
433 | { |
434 | if (!cb) | |
435 | return -EINVAL; | |
436 | ||
437 | if (length == 0) | |
438 | return 0; | |
439 | ||
5db7514d TW |
440 | cb->buf.data = kmalloc(length, GFP_KERNEL); |
441 | if (!cb->buf.data) | |
664df38b | 442 | return -ENOMEM; |
5db7514d | 443 | cb->buf.size = length; |
664df38b TW |
444 | return 0; |
445 | } | |
9ca9050b | 446 | |
bca67d68 TW |
447 | /** |
448 | * mei_cl_alloc_cb - a convenient wrapper for allocating read cb | |
449 | * | |
450 | * @cl: host client | |
451 | * @length: size of the buffer | |
452 | * @type: operation type | |
453 | * @fp: associated file pointer (might be NULL) | |
454 | * | |
455 | * Return: cb on success and NULL on failure | |
456 | */ | |
457 | struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length, | |
458 | enum mei_cb_file_ops type, struct file *fp) | |
459 | { | |
460 | struct mei_cl_cb *cb; | |
461 | ||
462 | cb = mei_io_cb_init(cl, type, fp); | |
463 | if (!cb) | |
464 | return NULL; | |
465 | ||
466 | if (mei_io_cb_alloc_buf(cb, length)) { | |
467 | mei_io_cb_free(cb); | |
468 | return NULL; | |
469 | } | |
470 | ||
471 | return cb; | |
472 | } | |
473 | ||
a9bed610 TW |
474 | /** |
475 | * mei_cl_read_cb - find this cl's callback in the read list | |
476 | * for a specific file | |
477 | * | |
478 | * @cl: host client | |
479 | * @fp: file pointer (matching cb file object), may be NULL | |
480 | * | |
481 | * Return: cb on success, NULL if cb is not found | |
482 | */ | |
483 | struct mei_cl_cb *mei_cl_read_cb(const struct mei_cl *cl, const struct file *fp) | |
484 | { | |
485 | struct mei_cl_cb *cb; | |
486 | ||
487 | list_for_each_entry(cb, &cl->rd_completed, list) | |
488 | if (!fp || fp == cb->file_object) | |
489 | return cb; | |
490 | ||
491 | return NULL; | |
492 | } | |
493 | ||
494 | /** | |
495 | * mei_cl_read_cb_flush - free client's read pending and completed cbs | |
496 | * for a specific file | |
497 | * | |
498 | * @cl: host client | |
499 | * @fp: file pointer (matching cb file object), may be NULL | |
500 | */ | |
501 | void mei_cl_read_cb_flush(const struct mei_cl *cl, const struct file *fp) | |
502 | { | |
503 | struct mei_cl_cb *cb, *next; | |
504 | ||
505 | list_for_each_entry_safe(cb, next, &cl->rd_completed, list) | |
506 | if (!fp || fp == cb->file_object) | |
507 | mei_io_cb_free(cb); | |
508 | ||
509 | ||
510 | list_for_each_entry_safe(cb, next, &cl->rd_pending, list) | |
511 | if (!fp || fp == cb->file_object) | |
512 | mei_io_cb_free(cb); | |
513 | } | |
514 | ||
9ca9050b TW |
515 | /** |
516 | * mei_cl_flush_queues - flushes queue lists belonging to cl. | |
517 | * | |
9ca9050b | 518 | * @cl: host client |
a9bed610 | 519 | * @fp: file pointer (matching cb file object), may be NULL |
ce23139c AU |
520 | * |
521 | * Return: 0 on success, -EINVAL if cl or cl->dev is NULL. | |
9ca9050b | 522 | */ |
a9bed610 | 523 | int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp) |
9ca9050b | 524 | { |
c0abffbd AU |
525 | struct mei_device *dev; |
526 | ||
90e0b5f1 | 527 | if (WARN_ON(!cl || !cl->dev)) |
9ca9050b TW |
528 | return -EINVAL; |
529 | ||
c0abffbd AU |
530 | dev = cl->dev; |
531 | ||
532 | cl_dbg(dev, cl, "remove list entry belonging to cl\n"); | |
cc99ecfd TW |
533 | mei_io_list_free(&cl->dev->write_list, cl); |
534 | mei_io_list_free(&cl->dev->write_waiting_list, cl); | |
9ca9050b TW |
535 | mei_io_list_flush(&cl->dev->ctrl_wr_list, cl); |
536 | mei_io_list_flush(&cl->dev->ctrl_rd_list, cl); | |
537 | mei_io_list_flush(&cl->dev->amthif_cmd_list, cl); | |
538 | mei_io_list_flush(&cl->dev->amthif_rd_complete_list, cl); | |
a9bed610 TW |
539 | |
540 | mei_cl_read_cb_flush(cl, fp); | |
541 | ||
9ca9050b TW |
542 | return 0; |
543 | } | |
544 | ||
ab841160 | 545 | |
9ca9050b | 546 | /** |
83ce0741 | 547 | * mei_cl_init - initializes cl. |
9ca9050b TW |
548 | * |
549 | * @cl: host client to be initialized | |
550 | * @dev: mei device | |
551 | */ | |
552 | void mei_cl_init(struct mei_cl *cl, struct mei_device *dev) | |
553 | { | |
554 | memset(cl, 0, sizeof(struct mei_cl)); | |
555 | init_waitqueue_head(&cl->wait); | |
556 | init_waitqueue_head(&cl->rx_wait); | |
557 | init_waitqueue_head(&cl->tx_wait); | |
a9bed610 TW |
558 | INIT_LIST_HEAD(&cl->rd_completed); |
559 | INIT_LIST_HEAD(&cl->rd_pending); | |
9ca9050b | 560 | INIT_LIST_HEAD(&cl->link); |
a7b71bc0 | 561 | INIT_LIST_HEAD(&cl->device_link); |
9ca9050b | 562 | cl->writing_state = MEI_IDLE; |
3c666182 | 563 | cl->state = MEI_FILE_INITIALIZING; |
9ca9050b TW |
564 | cl->dev = dev; |
565 | } | |
566 | ||
567 | /** | |
568 | * mei_cl_allocate - allocates cl structure and sets it up. | |
569 | * | |
570 | * @dev: mei device | |
a8605ea2 | 571 | * Return: The allocated file or NULL on failure |
9ca9050b TW |
572 | */ |
573 | struct mei_cl *mei_cl_allocate(struct mei_device *dev) | |
574 | { | |
575 | struct mei_cl *cl; | |
576 | ||
577 | cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL); | |
578 | if (!cl) | |
579 | return NULL; | |
580 | ||
581 | mei_cl_init(cl, dev); | |
582 | ||
583 | return cl; | |
584 | } | |
585 | ||
3908be6f AU |
586 | /** |
587 | * mei_cl_link - allocate host id in the host map | |
9ca9050b | 588 | * |
3908be6f | 589 | * @cl: host client |
03b8d341 | 590 | * @id: fixed host id or MEI_HOST_CLIENT_ID_ANY (-1) for generic one |
393b148f | 591 | * |
a8605ea2 | 592 | * Return: 0 on success |
9ca9050b | 593 | * -EINVAL on incorrect values |
03b8d341 | 594 | * -EMFILE if open count exceeded. |
9ca9050b | 595 | */ |
781d0d89 | 596 | int mei_cl_link(struct mei_cl *cl, int id) |
9ca9050b | 597 | { |
90e0b5f1 | 598 | struct mei_device *dev; |
22f96a0e | 599 | long open_handle_count; |
9ca9050b | 600 | |
781d0d89 | 601 | if (WARN_ON(!cl || !cl->dev)) |
9ca9050b TW |
602 | return -EINVAL; |
603 | ||
90e0b5f1 TW |
604 | dev = cl->dev; |
605 | ||
83ce0741 | 606 | /* If Id is not assigned get one*/ |
781d0d89 TW |
607 | if (id == MEI_HOST_CLIENT_ID_ANY) |
608 | id = find_first_zero_bit(dev->host_clients_map, | |
609 | MEI_CLIENTS_MAX); | |
9ca9050b | 610 | |
781d0d89 | 611 | if (id >= MEI_CLIENTS_MAX) { |
2bf94cab | 612 | dev_err(dev->dev, "id exceeded %d", MEI_CLIENTS_MAX); |
e036cc57 TW |
613 | return -EMFILE; |
614 | } | |
615 | ||
22f96a0e TW |
616 | open_handle_count = dev->open_handle_count + dev->iamthif_open_count; |
617 | if (open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) { | |
2bf94cab | 618 | dev_err(dev->dev, "open_handle_count exceeded %d", |
e036cc57 TW |
619 | MEI_MAX_OPEN_HANDLE_COUNT); |
620 | return -EMFILE; | |
9ca9050b TW |
621 | } |
622 | ||
781d0d89 TW |
623 | dev->open_handle_count++; |
624 | ||
625 | cl->host_client_id = id; | |
626 | list_add_tail(&cl->link, &dev->file_list); | |
627 | ||
628 | set_bit(id, dev->host_clients_map); | |
629 | ||
630 | cl->state = MEI_FILE_INITIALIZING; | |
631 | ||
c0abffbd | 632 | cl_dbg(dev, cl, "link cl\n"); |
781d0d89 | 633 | return 0; |
9ca9050b | 634 | } |
781d0d89 | 635 | |
9ca9050b | 636 | /** |
d49ed64a | 637 | * mei_cl_unlink - remove host client from the list |
9ca9050b | 638 | * |
393b148f | 639 | * @cl: host client |
ce23139c AU |
640 | * |
641 | * Return: always 0 | |
9ca9050b | 642 | */ |
90e0b5f1 | 643 | int mei_cl_unlink(struct mei_cl *cl) |
9ca9050b | 644 | { |
90e0b5f1 | 645 | struct mei_device *dev; |
90e0b5f1 | 646 | |
781d0d89 TW |
647 | /* don't shout on error exit path */ |
648 | if (!cl) | |
649 | return 0; | |
650 | ||
8e9a4a9a TW |
651 | /* wd and amthif might not be initialized */ |
652 | if (!cl->dev) | |
653 | return 0; | |
90e0b5f1 TW |
654 | |
655 | dev = cl->dev; | |
656 | ||
a14c44d8 TW |
657 | cl_dbg(dev, cl, "unlink client"); |
658 | ||
22f96a0e TW |
659 | if (dev->open_handle_count > 0) |
660 | dev->open_handle_count--; | |
661 | ||
662 | /* never clear the 0 bit */ | |
663 | if (cl->host_client_id) | |
664 | clear_bit(cl->host_client_id, dev->host_clients_map); | |
665 | ||
666 | list_del_init(&cl->link); | |
667 | ||
668 | cl->state = MEI_FILE_INITIALIZING; | |
669 | ||
90e0b5f1 | 670 | return 0; |
9ca9050b TW |
671 | } |
672 | ||
673 | ||
674 | void mei_host_client_init(struct work_struct *work) | |
675 | { | |
b7d88514 TW |
676 | struct mei_device *dev = |
677 | container_of(work, struct mei_device, init_work); | |
5ca2d388 | 678 | struct mei_me_client *me_cl; |
9ca9050b TW |
679 | |
680 | mutex_lock(&dev->device_lock); | |
681 | ||
9ca9050b | 682 | |
b7d88514 TW |
683 | me_cl = mei_me_cl_by_uuid(dev, &mei_amthif_guid); |
684 | if (me_cl) | |
d49ed64a | 685 | mei_amthif_host_init(dev, me_cl); |
b43baf69 | 686 | mei_me_cl_put(me_cl); |
b7d88514 TW |
687 | |
688 | me_cl = mei_me_cl_by_uuid(dev, &mei_wd_guid); | |
689 | if (me_cl) | |
d49ed64a | 690 | mei_wd_host_init(dev, me_cl); |
b43baf69 | 691 | mei_me_cl_put(me_cl); |
b7d88514 TW |
692 | |
693 | me_cl = mei_me_cl_by_uuid(dev, &mei_nfc_guid); | |
694 | if (me_cl) | |
d49ed64a | 695 | mei_nfc_host_init(dev, me_cl); |
b43baf69 | 696 | mei_me_cl_put(me_cl); |
59fcd7c6 | 697 | |
9ca9050b TW |
698 | |
699 | dev->dev_state = MEI_DEV_ENABLED; | |
6adb8efb | 700 | dev->reset_count = 0; |
9ca9050b | 701 | mutex_unlock(&dev->device_lock); |
04bb139a | 702 | |
2bf94cab TW |
703 | pm_runtime_mark_last_busy(dev->dev); |
704 | dev_dbg(dev->dev, "rpm: autosuspend\n"); | |
705 | pm_runtime_autosuspend(dev->dev); | |
9ca9050b TW |
706 | } |
707 | ||
6aae48ff | 708 | /** |
a8605ea2 | 709 | * mei_hbuf_acquire - try to acquire host buffer |
6aae48ff TW |
710 | * |
711 | * @dev: the device structure | |
a8605ea2 | 712 | * Return: true if host buffer was acquired |
6aae48ff TW |
713 | */ |
714 | bool mei_hbuf_acquire(struct mei_device *dev) | |
715 | { | |
04bb139a TW |
716 | if (mei_pg_state(dev) == MEI_PG_ON || |
717 | dev->pg_event == MEI_PG_EVENT_WAIT) { | |
2bf94cab | 718 | dev_dbg(dev->dev, "device is in pg\n"); |
04bb139a TW |
719 | return false; |
720 | } | |
721 | ||
6aae48ff | 722 | if (!dev->hbuf_is_ready) { |
2bf94cab | 723 | dev_dbg(dev->dev, "hbuf is not ready\n"); |
6aae48ff TW |
724 | return false; |
725 | } | |
726 | ||
727 | dev->hbuf_is_ready = false; | |
728 | ||
729 | return true; | |
730 | } | |
9ca9050b | 731 | |
3c666182 TW |
732 | /** |
733 | * mei_cl_set_disconnected - set disconnected state and clear | |
734 | * associated states and resources | |
735 | * | |
736 | * @cl: host client | |
737 | */ | |
738 | void mei_cl_set_disconnected(struct mei_cl *cl) | |
739 | { | |
740 | struct mei_device *dev = cl->dev; | |
741 | ||
742 | if (cl->state == MEI_FILE_DISCONNECTED || | |
743 | cl->state == MEI_FILE_INITIALIZING) | |
744 | return; | |
745 | ||
746 | cl->state = MEI_FILE_DISCONNECTED; | |
747 | mei_io_list_flush(&dev->ctrl_rd_list, cl); | |
748 | mei_io_list_flush(&dev->ctrl_wr_list, cl); | |
749 | cl->mei_flow_ctrl_creds = 0; | |
750 | cl->timer_count = 0; | |
d49ed64a | 751 | |
a03d77f6 AU |
752 | if (!cl->me_cl) |
753 | return; | |
754 | ||
755 | if (!WARN_ON(cl->me_cl->connect_count == 0)) | |
756 | cl->me_cl->connect_count--; | |
757 | ||
758 | if (cl->me_cl->connect_count == 0) | |
759 | cl->me_cl->mei_flow_ctrl_creds = 0; | |
760 | ||
d49ed64a AU |
761 | mei_me_cl_put(cl->me_cl); |
762 | cl->me_cl = NULL; | |
3c666182 TW |
763 | } |
764 | ||
a03d77f6 AU |
765 | static int mei_cl_set_connecting(struct mei_cl *cl, struct mei_me_client *me_cl) |
766 | { | |
767 | cl->me_cl = mei_me_cl_get(me_cl); | |
768 | if (!cl->me_cl) | |
769 | return -ENOENT; | |
770 | ||
771 | cl->state = MEI_FILE_CONNECTING; | |
772 | cl->me_cl->connect_count++; | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
3c666182 TW |
777 | /* |
778 | * mei_cl_send_disconnect - send disconnect request | |
779 | * | |
780 | * @cl: host client | |
781 | * @cb: callback block | |
782 | * | |
783 | * Return: 0, OK; otherwise, error. | |
784 | */ | |
785 | static int mei_cl_send_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb) | |
786 | { | |
787 | struct mei_device *dev; | |
788 | int ret; | |
789 | ||
790 | dev = cl->dev; | |
791 | ||
792 | ret = mei_hbm_cl_disconnect_req(dev, cl); | |
793 | cl->status = ret; | |
794 | if (ret) { | |
795 | cl->state = MEI_FILE_DISCONNECT_REPLY; | |
796 | return ret; | |
797 | } | |
798 | ||
799 | list_move_tail(&cb->list, &dev->ctrl_rd_list.list); | |
800 | cl->timer_count = MEI_CONNECT_TIMEOUT; | |
801 | ||
802 | return 0; | |
803 | } | |
804 | ||
805 | /** | |
806 | * mei_cl_irq_disconnect - processes close related operation from | |
807 | * interrupt thread context - send disconnect request | |
808 | * | |
809 | * @cl: client | |
810 | * @cb: callback block. | |
811 | * @cmpl_list: complete list. | |
812 | * | |
813 | * Return: 0, OK; otherwise, error. | |
814 | */ | |
815 | int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb, | |
816 | struct mei_cl_cb *cmpl_list) | |
817 | { | |
818 | struct mei_device *dev = cl->dev; | |
819 | u32 msg_slots; | |
820 | int slots; | |
821 | int ret; | |
822 | ||
823 | msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request)); | |
824 | slots = mei_hbuf_empty_slots(dev); | |
825 | ||
826 | if (slots < msg_slots) | |
827 | return -EMSGSIZE; | |
828 | ||
829 | ret = mei_cl_send_disconnect(cl, cb); | |
830 | if (ret) | |
831 | list_move_tail(&cb->list, &cmpl_list->list); | |
832 | ||
833 | return ret; | |
834 | } | |
835 | ||
836 | ||
837 | ||
9ca9050b | 838 | /** |
83ce0741 | 839 | * mei_cl_disconnect - disconnect host client from the me one |
9ca9050b | 840 | * |
90e0b5f1 | 841 | * @cl: host client |
9ca9050b TW |
842 | * |
843 | * Locking: called under "dev->device_lock" lock | |
844 | * | |
a8605ea2 | 845 | * Return: 0 on success, <0 on failure. |
9ca9050b | 846 | */ |
90e0b5f1 | 847 | int mei_cl_disconnect(struct mei_cl *cl) |
9ca9050b | 848 | { |
90e0b5f1 | 849 | struct mei_device *dev; |
9ca9050b | 850 | struct mei_cl_cb *cb; |
fe2f17eb | 851 | int rets; |
9ca9050b | 852 | |
90e0b5f1 | 853 | if (WARN_ON(!cl || !cl->dev)) |
9ca9050b TW |
854 | return -ENODEV; |
855 | ||
90e0b5f1 TW |
856 | dev = cl->dev; |
857 | ||
c0abffbd AU |
858 | cl_dbg(dev, cl, "disconnecting"); |
859 | ||
3c666182 | 860 | if (!mei_cl_is_connected(cl)) |
9ca9050b TW |
861 | return 0; |
862 | ||
2bf94cab | 863 | rets = pm_runtime_get(dev->dev); |
04bb139a | 864 | if (rets < 0 && rets != -EINPROGRESS) { |
2bf94cab | 865 | pm_runtime_put_noidle(dev->dev); |
04bb139a TW |
866 | cl_err(dev, cl, "rpm: get failed %d\n", rets); |
867 | return rets; | |
868 | } | |
869 | ||
3c666182 TW |
870 | cl->state = MEI_FILE_DISCONNECTING; |
871 | ||
bca67d68 TW |
872 | cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT, NULL); |
873 | rets = cb ? 0 : -ENOMEM; | |
874 | if (rets) | |
3c666182 TW |
875 | goto out; |
876 | ||
877 | cl_dbg(dev, cl, "add disconnect cb to control write list\n"); | |
878 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); | |
5a8373fb | 879 | |
6aae48ff | 880 | if (mei_hbuf_acquire(dev)) { |
3c666182 TW |
881 | rets = mei_cl_send_disconnect(cl, cb); |
882 | if (rets) { | |
c0abffbd | 883 | cl_err(dev, cl, "failed to disconnect.\n"); |
3c666182 | 884 | goto out; |
9ca9050b | 885 | } |
9ca9050b | 886 | } |
9ca9050b | 887 | |
3c666182 TW |
888 | mutex_unlock(&dev->device_lock); |
889 | wait_event_timeout(cl->wait, cl->state == MEI_FILE_DISCONNECT_REPLY, | |
890 | mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); | |
9ca9050b | 891 | mutex_lock(&dev->device_lock); |
fe2f17eb | 892 | |
3c666182 TW |
893 | rets = cl->status; |
894 | if (cl->state != MEI_FILE_DISCONNECT_REPLY) { | |
fe2f17eb AU |
895 | cl_dbg(dev, cl, "timeout on disconnect from FW client.\n"); |
896 | rets = -ETIME; | |
9ca9050b TW |
897 | } |
898 | ||
3c666182 TW |
899 | out: |
900 | /* we disconnect also on error */ | |
901 | mei_cl_set_disconnected(cl); | |
902 | if (!rets) | |
903 | cl_dbg(dev, cl, "successfully disconnected from FW client.\n"); | |
904 | ||
04bb139a | 905 | cl_dbg(dev, cl, "rpm: autosuspend\n"); |
2bf94cab TW |
906 | pm_runtime_mark_last_busy(dev->dev); |
907 | pm_runtime_put_autosuspend(dev->dev); | |
04bb139a | 908 | |
9ca9050b TW |
909 | mei_io_cb_free(cb); |
910 | return rets; | |
911 | } | |
912 | ||
913 | ||
914 | /** | |
90e0b5f1 TW |
915 | * mei_cl_is_other_connecting - checks if other |
916 | * client with the same me client id is connecting | |
9ca9050b | 917 | * |
9ca9050b TW |
918 | * @cl: private data of the file object |
919 | * | |
a8605ea2 | 920 | * Return: true if other client is connected, false - otherwise. |
9ca9050b | 921 | */ |
0c53357c | 922 | static bool mei_cl_is_other_connecting(struct mei_cl *cl) |
9ca9050b | 923 | { |
90e0b5f1 | 924 | struct mei_device *dev; |
0c53357c | 925 | struct mei_cl_cb *cb; |
90e0b5f1 TW |
926 | |
927 | dev = cl->dev; | |
928 | ||
0c53357c TW |
929 | list_for_each_entry(cb, &dev->ctrl_rd_list.list, list) { |
930 | if (cb->fop_type == MEI_FOP_CONNECT && | |
d49ed64a | 931 | mei_cl_me_id(cl) == mei_cl_me_id(cb->cl)) |
90e0b5f1 | 932 | return true; |
9ca9050b | 933 | } |
90e0b5f1 TW |
934 | |
935 | return false; | |
9ca9050b TW |
936 | } |
937 | ||
0c53357c TW |
938 | /** |
939 | * mei_cl_send_connect - send connect request | |
940 | * | |
941 | * @cl: host client | |
942 | * @cb: callback block | |
943 | * | |
944 | * Return: 0, OK; otherwise, error. | |
945 | */ | |
946 | static int mei_cl_send_connect(struct mei_cl *cl, struct mei_cl_cb *cb) | |
947 | { | |
948 | struct mei_device *dev; | |
949 | int ret; | |
950 | ||
951 | dev = cl->dev; | |
952 | ||
953 | ret = mei_hbm_cl_connect_req(dev, cl); | |
954 | cl->status = ret; | |
955 | if (ret) { | |
956 | cl->state = MEI_FILE_DISCONNECT_REPLY; | |
957 | return ret; | |
958 | } | |
959 | ||
960 | list_move_tail(&cb->list, &dev->ctrl_rd_list.list); | |
961 | cl->timer_count = MEI_CONNECT_TIMEOUT; | |
962 | return 0; | |
963 | } | |
964 | ||
965 | /** | |
966 | * mei_cl_irq_connect - send connect request in irq_thread context | |
967 | * | |
968 | * @cl: host client | |
969 | * @cb: callback block | |
970 | * @cmpl_list: complete list | |
971 | * | |
972 | * Return: 0, OK; otherwise, error. | |
973 | */ | |
974 | int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb, | |
975 | struct mei_cl_cb *cmpl_list) | |
976 | { | |
977 | struct mei_device *dev = cl->dev; | |
978 | u32 msg_slots; | |
979 | int slots; | |
980 | int rets; | |
981 | ||
982 | msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request)); | |
983 | slots = mei_hbuf_empty_slots(dev); | |
984 | ||
985 | if (mei_cl_is_other_connecting(cl)) | |
986 | return 0; | |
987 | ||
988 | if (slots < msg_slots) | |
989 | return -EMSGSIZE; | |
990 | ||
991 | rets = mei_cl_send_connect(cl, cb); | |
992 | if (rets) | |
993 | list_move_tail(&cb->list, &cmpl_list->list); | |
994 | ||
995 | return rets; | |
996 | } | |
997 | ||
9f81abda | 998 | /** |
83ce0741 | 999 | * mei_cl_connect - connect host client to the me one |
9f81abda TW |
1000 | * |
1001 | * @cl: host client | |
d49ed64a | 1002 | * @me_cl: me client |
a8605ea2 | 1003 | * @file: pointer to file structure |
9f81abda TW |
1004 | * |
1005 | * Locking: called under "dev->device_lock" lock | |
1006 | * | |
a8605ea2 | 1007 | * Return: 0 on success, <0 on failure. |
9f81abda | 1008 | */ |
d49ed64a AU |
1009 | int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl, |
1010 | struct file *file) | |
9f81abda TW |
1011 | { |
1012 | struct mei_device *dev; | |
1013 | struct mei_cl_cb *cb; | |
9f81abda TW |
1014 | int rets; |
1015 | ||
1016 | if (WARN_ON(!cl || !cl->dev)) | |
1017 | return -ENODEV; | |
1018 | ||
1019 | dev = cl->dev; | |
1020 | ||
2bf94cab | 1021 | rets = pm_runtime_get(dev->dev); |
04bb139a | 1022 | if (rets < 0 && rets != -EINPROGRESS) { |
2bf94cab | 1023 | pm_runtime_put_noidle(dev->dev); |
04bb139a TW |
1024 | cl_err(dev, cl, "rpm: get failed %d\n", rets); |
1025 | return rets; | |
1026 | } | |
1027 | ||
bca67d68 TW |
1028 | cb = mei_io_cb_init(cl, MEI_FOP_CONNECT, file); |
1029 | rets = cb ? 0 : -ENOMEM; | |
1030 | if (rets) | |
9f81abda | 1031 | goto out; |
9f81abda | 1032 | |
a03d77f6 AU |
1033 | rets = mei_cl_set_connecting(cl, me_cl); |
1034 | if (rets) | |
d49ed64a | 1035 | goto out; |
0c53357c TW |
1036 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); |
1037 | ||
6aae48ff TW |
1038 | /* run hbuf acquire last so we don't have to undo */ |
1039 | if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) { | |
0c53357c TW |
1040 | rets = mei_cl_send_connect(cl, cb); |
1041 | if (rets) | |
9f81abda | 1042 | goto out; |
9f81abda TW |
1043 | } |
1044 | ||
1045 | mutex_unlock(&dev->device_lock); | |
12f45ed4 | 1046 | wait_event_timeout(cl->wait, |
285e2996 | 1047 | (cl->state == MEI_FILE_CONNECTED || |
3c666182 | 1048 | cl->state == MEI_FILE_DISCONNECT_REPLY), |
285e2996 | 1049 | mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); |
9f81abda TW |
1050 | mutex_lock(&dev->device_lock); |
1051 | ||
f3de9b63 | 1052 | if (!mei_cl_is_connected(cl)) { |
0c53357c | 1053 | /* timeout or something went really wrong */ |
285e2996 AU |
1054 | if (!cl->status) |
1055 | cl->status = -EFAULT; | |
9f81abda TW |
1056 | } |
1057 | ||
1058 | rets = cl->status; | |
9f81abda | 1059 | out: |
04bb139a | 1060 | cl_dbg(dev, cl, "rpm: autosuspend\n"); |
2bf94cab TW |
1061 | pm_runtime_mark_last_busy(dev->dev); |
1062 | pm_runtime_put_autosuspend(dev->dev); | |
04bb139a | 1063 | |
9f81abda | 1064 | mei_io_cb_free(cb); |
0c53357c TW |
1065 | |
1066 | if (!mei_cl_is_connected(cl)) | |
1067 | mei_cl_set_disconnected(cl); | |
1068 | ||
9f81abda TW |
1069 | return rets; |
1070 | } | |
1071 | ||
03b8d341 TW |
1072 | /** |
1073 | * mei_cl_alloc_linked - allocate and link host client | |
1074 | * | |
1075 | * @dev: the device structure | |
1076 | * @id: fixed host id or MEI_HOST_CLIENT_ID_ANY (-1) for generic one | |
1077 | * | |
1078 | * Return: cl on success ERR_PTR on failure | |
1079 | */ | |
1080 | struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev, int id) | |
1081 | { | |
1082 | struct mei_cl *cl; | |
1083 | int ret; | |
1084 | ||
1085 | cl = mei_cl_allocate(dev); | |
1086 | if (!cl) { | |
1087 | ret = -ENOMEM; | |
1088 | goto err; | |
1089 | } | |
1090 | ||
1091 | ret = mei_cl_link(cl, id); | |
1092 | if (ret) | |
1093 | goto err; | |
1094 | ||
1095 | return cl; | |
1096 | err: | |
1097 | kfree(cl); | |
1098 | return ERR_PTR(ret); | |
1099 | } | |
1100 | ||
1101 | ||
1102 | ||
9ca9050b | 1103 | /** |
90e0b5f1 | 1104 | * mei_cl_flow_ctrl_creds - checks flow_control credits for cl. |
9ca9050b | 1105 | * |
9ca9050b TW |
1106 | * @cl: private data of the file object |
1107 | * | |
a8605ea2 | 1108 | * Return: 1 if mei_flow_ctrl_creds >0, 0 - otherwise. |
9ca9050b | 1109 | */ |
90e0b5f1 | 1110 | int mei_cl_flow_ctrl_creds(struct mei_cl *cl) |
9ca9050b | 1111 | { |
d49ed64a | 1112 | if (WARN_ON(!cl || !cl->me_cl)) |
90e0b5f1 TW |
1113 | return -EINVAL; |
1114 | ||
9ca9050b TW |
1115 | if (cl->mei_flow_ctrl_creds > 0) |
1116 | return 1; | |
1117 | ||
d49ed64a AU |
1118 | if (mei_cl_is_single_recv_buf(cl)) { |
1119 | if (cl->me_cl->mei_flow_ctrl_creds > 0) | |
1120 | return 1; | |
9ca9050b | 1121 | } |
d49ed64a | 1122 | return 0; |
9ca9050b TW |
1123 | } |
1124 | ||
1125 | /** | |
90e0b5f1 | 1126 | * mei_cl_flow_ctrl_reduce - reduces flow_control. |
9ca9050b | 1127 | * |
9ca9050b | 1128 | * @cl: private data of the file object |
393b148f | 1129 | * |
a8605ea2 | 1130 | * Return: |
9ca9050b | 1131 | * 0 on success |
9ca9050b TW |
1132 | * -EINVAL when ctrl credits are <= 0 |
1133 | */ | |
90e0b5f1 | 1134 | int mei_cl_flow_ctrl_reduce(struct mei_cl *cl) |
9ca9050b | 1135 | { |
d49ed64a | 1136 | if (WARN_ON(!cl || !cl->me_cl)) |
90e0b5f1 TW |
1137 | return -EINVAL; |
1138 | ||
d49ed64a AU |
1139 | if (mei_cl_is_single_recv_buf(cl)) { |
1140 | if (WARN_ON(cl->me_cl->mei_flow_ctrl_creds <= 0)) | |
1141 | return -EINVAL; | |
1142 | cl->me_cl->mei_flow_ctrl_creds--; | |
12d00665 | 1143 | } else { |
d49ed64a AU |
1144 | if (WARN_ON(cl->mei_flow_ctrl_creds <= 0)) |
1145 | return -EINVAL; | |
12d00665 | 1146 | cl->mei_flow_ctrl_creds--; |
9ca9050b | 1147 | } |
d49ed64a | 1148 | return 0; |
9ca9050b TW |
1149 | } |
1150 | ||
ab841160 | 1151 | /** |
393b148f | 1152 | * mei_cl_read_start - the start read client message function. |
ab841160 | 1153 | * |
90e0b5f1 | 1154 | * @cl: host client |
ce23139c | 1155 | * @length: number of bytes to read |
bca67d68 | 1156 | * @fp: pointer to file structure |
ab841160 | 1157 | * |
a8605ea2 | 1158 | * Return: 0 on success, <0 on failure. |
ab841160 | 1159 | */ |
bca67d68 | 1160 | int mei_cl_read_start(struct mei_cl *cl, size_t length, struct file *fp) |
ab841160 | 1161 | { |
90e0b5f1 | 1162 | struct mei_device *dev; |
ab841160 | 1163 | struct mei_cl_cb *cb; |
664df38b | 1164 | int rets; |
ab841160 | 1165 | |
90e0b5f1 TW |
1166 | if (WARN_ON(!cl || !cl->dev)) |
1167 | return -ENODEV; | |
1168 | ||
1169 | dev = cl->dev; | |
1170 | ||
b950ac1d | 1171 | if (!mei_cl_is_connected(cl)) |
ab841160 OW |
1172 | return -ENODEV; |
1173 | ||
a9bed610 TW |
1174 | /* HW currently supports only one pending read */ |
1175 | if (!list_empty(&cl->rd_pending)) | |
ab841160 | 1176 | return -EBUSY; |
a9bed610 | 1177 | |
d49ed64a AU |
1178 | if (!mei_me_cl_is_active(cl->me_cl)) { |
1179 | cl_err(dev, cl, "no such me client\n"); | |
7ca96aa2 | 1180 | return -ENOTTY; |
664df38b | 1181 | } |
79563db9 | 1182 | /* always allocate at least client max message */ |
d49ed64a | 1183 | length = max_t(size_t, length, mei_cl_mtu(cl)); |
ab841160 | 1184 | |
2bf94cab | 1185 | rets = pm_runtime_get(dev->dev); |
04bb139a | 1186 | if (rets < 0 && rets != -EINPROGRESS) { |
2bf94cab | 1187 | pm_runtime_put_noidle(dev->dev); |
04bb139a TW |
1188 | cl_err(dev, cl, "rpm: get failed %d\n", rets); |
1189 | return rets; | |
1190 | } | |
1191 | ||
bca67d68 TW |
1192 | cb = mei_cl_alloc_cb(cl, length, MEI_FOP_READ, fp); |
1193 | rets = cb ? 0 : -ENOMEM; | |
664df38b | 1194 | if (rets) |
04bb139a | 1195 | goto out; |
ab841160 | 1196 | |
6aae48ff | 1197 | if (mei_hbuf_acquire(dev)) { |
86113500 AU |
1198 | rets = mei_hbm_cl_flow_control_req(dev, cl); |
1199 | if (rets < 0) | |
04bb139a | 1200 | goto out; |
04bb139a | 1201 | |
a9bed610 | 1202 | list_add_tail(&cb->list, &cl->rd_pending); |
ab841160 | 1203 | } else { |
fb601adb | 1204 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); |
ab841160 | 1205 | } |
accb884b | 1206 | |
04bb139a TW |
1207 | out: |
1208 | cl_dbg(dev, cl, "rpm: autosuspend\n"); | |
2bf94cab TW |
1209 | pm_runtime_mark_last_busy(dev->dev); |
1210 | pm_runtime_put_autosuspend(dev->dev); | |
04bb139a TW |
1211 | |
1212 | if (rets) | |
1213 | mei_io_cb_free(cb); | |
1214 | ||
ab841160 OW |
1215 | return rets; |
1216 | } | |
1217 | ||
21767546 | 1218 | /** |
9d098192 | 1219 | * mei_cl_irq_write - write a message to device |
21767546 TW |
1220 | * from the interrupt thread context |
1221 | * | |
1222 | * @cl: client | |
1223 | * @cb: callback block. | |
21767546 TW |
1224 | * @cmpl_list: complete list. |
1225 | * | |
a8605ea2 | 1226 | * Return: 0, OK; otherwise error. |
21767546 | 1227 | */ |
9d098192 TW |
1228 | int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb, |
1229 | struct mei_cl_cb *cmpl_list) | |
21767546 | 1230 | { |
136698e5 TW |
1231 | struct mei_device *dev; |
1232 | struct mei_msg_data *buf; | |
21767546 | 1233 | struct mei_msg_hdr mei_hdr; |
136698e5 TW |
1234 | size_t len; |
1235 | u32 msg_slots; | |
9d098192 | 1236 | int slots; |
2ebf8c94 | 1237 | int rets; |
21767546 | 1238 | |
136698e5 TW |
1239 | if (WARN_ON(!cl || !cl->dev)) |
1240 | return -ENODEV; | |
1241 | ||
1242 | dev = cl->dev; | |
1243 | ||
5db7514d | 1244 | buf = &cb->buf; |
136698e5 TW |
1245 | |
1246 | rets = mei_cl_flow_ctrl_creds(cl); | |
1247 | if (rets < 0) | |
1248 | return rets; | |
1249 | ||
1250 | if (rets == 0) { | |
04bb139a | 1251 | cl_dbg(dev, cl, "No flow control credentials: not sending.\n"); |
136698e5 TW |
1252 | return 0; |
1253 | } | |
1254 | ||
9d098192 | 1255 | slots = mei_hbuf_empty_slots(dev); |
136698e5 TW |
1256 | len = buf->size - cb->buf_idx; |
1257 | msg_slots = mei_data2slots(len); | |
1258 | ||
21767546 | 1259 | mei_hdr.host_addr = cl->host_client_id; |
d49ed64a | 1260 | mei_hdr.me_addr = mei_cl_me_id(cl); |
21767546 | 1261 | mei_hdr.reserved = 0; |
479327fc | 1262 | mei_hdr.internal = cb->internal; |
21767546 | 1263 | |
9d098192 | 1264 | if (slots >= msg_slots) { |
21767546 TW |
1265 | mei_hdr.length = len; |
1266 | mei_hdr.msg_complete = 1; | |
1267 | /* Split the message only if we can write the whole host buffer */ | |
9d098192 TW |
1268 | } else if (slots == dev->hbuf_depth) { |
1269 | msg_slots = slots; | |
1270 | len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr); | |
21767546 TW |
1271 | mei_hdr.length = len; |
1272 | mei_hdr.msg_complete = 0; | |
1273 | } else { | |
1274 | /* wait for next time the host buffer is empty */ | |
1275 | return 0; | |
1276 | } | |
1277 | ||
c0abffbd | 1278 | cl_dbg(dev, cl, "buf: size = %d idx = %lu\n", |
5db7514d | 1279 | cb->buf.size, cb->buf_idx); |
21767546 | 1280 | |
136698e5 | 1281 | rets = mei_write_message(dev, &mei_hdr, buf->data + cb->buf_idx); |
2ebf8c94 TW |
1282 | if (rets) { |
1283 | cl->status = rets; | |
21767546 | 1284 | list_move_tail(&cb->list, &cmpl_list->list); |
2ebf8c94 | 1285 | return rets; |
21767546 TW |
1286 | } |
1287 | ||
1288 | cl->status = 0; | |
4dfaa9f7 | 1289 | cl->writing_state = MEI_WRITING; |
21767546 | 1290 | cb->buf_idx += mei_hdr.length; |
8660172e | 1291 | cb->completed = mei_hdr.msg_complete == 1; |
4dfaa9f7 | 1292 | |
21767546 TW |
1293 | if (mei_hdr.msg_complete) { |
1294 | if (mei_cl_flow_ctrl_reduce(cl)) | |
2ebf8c94 | 1295 | return -EIO; |
21767546 TW |
1296 | list_move_tail(&cb->list, &dev->write_waiting_list.list); |
1297 | } | |
1298 | ||
1299 | return 0; | |
1300 | } | |
1301 | ||
4234a6de TW |
1302 | /** |
1303 | * mei_cl_write - submit a write cb to mei device | |
a8605ea2 | 1304 | * assumes device_lock is locked |
4234a6de TW |
1305 | * |
1306 | * @cl: host client | |
a8605ea2 | 1307 | * @cb: write callback with filled data |
ce23139c | 1308 | * @blocking: block until completed |
4234a6de | 1309 | * |
a8605ea2 | 1310 | * Return: number of bytes sent on success, <0 on failure. |
4234a6de TW |
1311 | */ |
1312 | int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking) | |
1313 | { | |
1314 | struct mei_device *dev; | |
1315 | struct mei_msg_data *buf; | |
1316 | struct mei_msg_hdr mei_hdr; | |
1317 | int rets; | |
1318 | ||
1319 | ||
1320 | if (WARN_ON(!cl || !cl->dev)) | |
1321 | return -ENODEV; | |
1322 | ||
1323 | if (WARN_ON(!cb)) | |
1324 | return -EINVAL; | |
1325 | ||
1326 | dev = cl->dev; | |
1327 | ||
1328 | ||
5db7514d | 1329 | buf = &cb->buf; |
4234a6de | 1330 | |
0a01e974 | 1331 | cl_dbg(dev, cl, "size=%d\n", buf->size); |
4234a6de | 1332 | |
2bf94cab | 1333 | rets = pm_runtime_get(dev->dev); |
04bb139a | 1334 | if (rets < 0 && rets != -EINPROGRESS) { |
2bf94cab | 1335 | pm_runtime_put_noidle(dev->dev); |
04bb139a TW |
1336 | cl_err(dev, cl, "rpm: get failed %d\n", rets); |
1337 | return rets; | |
1338 | } | |
4234a6de | 1339 | |
6aae48ff TW |
1340 | cb->buf_idx = 0; |
1341 | cl->writing_state = MEI_IDLE; | |
1342 | ||
1343 | mei_hdr.host_addr = cl->host_client_id; | |
d49ed64a | 1344 | mei_hdr.me_addr = mei_cl_me_id(cl); |
6aae48ff TW |
1345 | mei_hdr.reserved = 0; |
1346 | mei_hdr.msg_complete = 0; | |
1347 | mei_hdr.internal = cb->internal; | |
4234a6de TW |
1348 | |
1349 | rets = mei_cl_flow_ctrl_creds(cl); | |
1350 | if (rets < 0) | |
1351 | goto err; | |
1352 | ||
6aae48ff TW |
1353 | if (rets == 0) { |
1354 | cl_dbg(dev, cl, "No flow control credentials: not sending.\n"); | |
1355 | rets = buf->size; | |
1356 | goto out; | |
1357 | } | |
1358 | if (!mei_hbuf_acquire(dev)) { | |
1359 | cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n"); | |
4234a6de TW |
1360 | rets = buf->size; |
1361 | goto out; | |
1362 | } | |
4234a6de TW |
1363 | |
1364 | /* Check for a maximum length */ | |
1365 | if (buf->size > mei_hbuf_max_len(dev)) { | |
1366 | mei_hdr.length = mei_hbuf_max_len(dev); | |
1367 | mei_hdr.msg_complete = 0; | |
1368 | } else { | |
1369 | mei_hdr.length = buf->size; | |
1370 | mei_hdr.msg_complete = 1; | |
1371 | } | |
1372 | ||
2ebf8c94 TW |
1373 | rets = mei_write_message(dev, &mei_hdr, buf->data); |
1374 | if (rets) | |
4234a6de | 1375 | goto err; |
4234a6de TW |
1376 | |
1377 | cl->writing_state = MEI_WRITING; | |
1378 | cb->buf_idx = mei_hdr.length; | |
8660172e | 1379 | cb->completed = mei_hdr.msg_complete == 1; |
4234a6de | 1380 | |
4234a6de TW |
1381 | out: |
1382 | if (mei_hdr.msg_complete) { | |
7ca96aa2 AU |
1383 | rets = mei_cl_flow_ctrl_reduce(cl); |
1384 | if (rets < 0) | |
4234a6de | 1385 | goto err; |
7ca96aa2 | 1386 | |
4234a6de TW |
1387 | list_add_tail(&cb->list, &dev->write_waiting_list.list); |
1388 | } else { | |
1389 | list_add_tail(&cb->list, &dev->write_list.list); | |
1390 | } | |
1391 | ||
1392 | ||
1393 | if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) { | |
1394 | ||
1395 | mutex_unlock(&dev->device_lock); | |
7ca96aa2 AU |
1396 | rets = wait_event_interruptible(cl->tx_wait, |
1397 | cl->writing_state == MEI_WRITE_COMPLETE); | |
4234a6de | 1398 | mutex_lock(&dev->device_lock); |
7ca96aa2 AU |
1399 | /* wait_event_interruptible returns -ERESTARTSYS */ |
1400 | if (rets) { | |
1401 | if (signal_pending(current)) | |
1402 | rets = -EINTR; | |
1403 | goto err; | |
1404 | } | |
4234a6de | 1405 | } |
7ca96aa2 AU |
1406 | |
1407 | rets = buf->size; | |
4234a6de | 1408 | err: |
04bb139a | 1409 | cl_dbg(dev, cl, "rpm: autosuspend\n"); |
2bf94cab TW |
1410 | pm_runtime_mark_last_busy(dev->dev); |
1411 | pm_runtime_put_autosuspend(dev->dev); | |
04bb139a | 1412 | |
4234a6de TW |
1413 | return rets; |
1414 | } | |
1415 | ||
1416 | ||
db086fa9 TW |
1417 | /** |
1418 | * mei_cl_complete - processes completed operation for a client | |
1419 | * | |
1420 | * @cl: private data of the file object. | |
1421 | * @cb: callback block. | |
1422 | */ | |
1423 | void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb) | |
1424 | { | |
3c666182 TW |
1425 | switch (cb->fop_type) { |
1426 | case MEI_FOP_WRITE: | |
db086fa9 | 1427 | mei_io_cb_free(cb); |
db086fa9 TW |
1428 | cl->writing_state = MEI_WRITE_COMPLETE; |
1429 | if (waitqueue_active(&cl->tx_wait)) | |
1430 | wake_up_interruptible(&cl->tx_wait); | |
3c666182 | 1431 | break; |
db086fa9 | 1432 | |
3c666182 | 1433 | case MEI_FOP_READ: |
a9bed610 | 1434 | list_add_tail(&cb->list, &cl->rd_completed); |
db086fa9 | 1435 | if (waitqueue_active(&cl->rx_wait)) |
1d9013f0 | 1436 | wake_up_interruptible_all(&cl->rx_wait); |
db086fa9 TW |
1437 | else |
1438 | mei_cl_bus_rx_event(cl); | |
3c666182 TW |
1439 | break; |
1440 | ||
1441 | case MEI_FOP_CONNECT: | |
1442 | case MEI_FOP_DISCONNECT: | |
1443 | if (waitqueue_active(&cl->wait)) | |
1444 | wake_up(&cl->wait); | |
db086fa9 | 1445 | |
3c666182 TW |
1446 | break; |
1447 | default: | |
1448 | BUG_ON(0); | |
db086fa9 TW |
1449 | } |
1450 | } | |
1451 | ||
4234a6de | 1452 | |
074b4c01 TW |
1453 | /** |
1454 | * mei_cl_all_disconnect - disconnect forcefully all connected clients | |
1455 | * | |
a8605ea2 | 1456 | * @dev: mei device |
074b4c01 | 1457 | */ |
074b4c01 TW |
1458 | void mei_cl_all_disconnect(struct mei_device *dev) |
1459 | { | |
31f88f57 | 1460 | struct mei_cl *cl; |
074b4c01 | 1461 | |
3c666182 TW |
1462 | list_for_each_entry(cl, &dev->file_list, link) |
1463 | mei_cl_set_disconnected(cl); | |
074b4c01 TW |
1464 | } |
1465 | ||
1466 | ||
1467 | /** | |
5290801c | 1468 | * mei_cl_all_wakeup - wake up all readers and writers they can be interrupted |
074b4c01 | 1469 | * |
a8605ea2 | 1470 | * @dev: mei device |
074b4c01 | 1471 | */ |
5290801c | 1472 | void mei_cl_all_wakeup(struct mei_device *dev) |
074b4c01 | 1473 | { |
31f88f57 | 1474 | struct mei_cl *cl; |
92db1555 | 1475 | |
31f88f57 | 1476 | list_for_each_entry(cl, &dev->file_list, link) { |
074b4c01 | 1477 | if (waitqueue_active(&cl->rx_wait)) { |
c0abffbd | 1478 | cl_dbg(dev, cl, "Waking up reading client!\n"); |
074b4c01 TW |
1479 | wake_up_interruptible(&cl->rx_wait); |
1480 | } | |
5290801c | 1481 | if (waitqueue_active(&cl->tx_wait)) { |
c0abffbd | 1482 | cl_dbg(dev, cl, "Waking up writing client!\n"); |
5290801c TW |
1483 | wake_up_interruptible(&cl->tx_wait); |
1484 | } | |
074b4c01 TW |
1485 | } |
1486 | } | |
1487 | ||
1488 | /** | |
1489 | * mei_cl_all_write_clear - clear all pending writes | |
a8605ea2 AU |
1490 | * |
1491 | * @dev: mei device | |
074b4c01 TW |
1492 | */ |
1493 | void mei_cl_all_write_clear(struct mei_device *dev) | |
1494 | { | |
cc99ecfd TW |
1495 | mei_io_list_free(&dev->write_list, NULL); |
1496 | mei_io_list_free(&dev->write_waiting_list, NULL); | |
074b4c01 TW |
1497 | } |
1498 | ||
1499 |