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, | |
f23e2cc4 | 362 | const struct file *fp) |
928fa666 TW |
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); | |
62e8e6ad | 371 | cb->fp = fp; |
928fa666 TW |
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, | |
f23e2cc4 TW |
458 | enum mei_cb_file_ops type, |
459 | const struct file *fp) | |
bca67d68 TW |
460 | { |
461 | struct mei_cl_cb *cb; | |
462 | ||
463 | cb = mei_io_cb_init(cl, type, fp); | |
464 | if (!cb) | |
465 | return NULL; | |
466 | ||
467 | if (mei_io_cb_alloc_buf(cb, length)) { | |
468 | mei_io_cb_free(cb); | |
469 | return NULL; | |
470 | } | |
471 | ||
472 | return cb; | |
473 | } | |
474 | ||
a9bed610 TW |
475 | /** |
476 | * mei_cl_read_cb - find this cl's callback in the read list | |
477 | * for a specific file | |
478 | * | |
479 | * @cl: host client | |
480 | * @fp: file pointer (matching cb file object), may be NULL | |
481 | * | |
482 | * Return: cb on success, NULL if cb is not found | |
483 | */ | |
484 | struct mei_cl_cb *mei_cl_read_cb(const struct mei_cl *cl, const struct file *fp) | |
485 | { | |
486 | struct mei_cl_cb *cb; | |
487 | ||
488 | list_for_each_entry(cb, &cl->rd_completed, list) | |
62e8e6ad | 489 | if (!fp || fp == cb->fp) |
a9bed610 TW |
490 | return cb; |
491 | ||
492 | return NULL; | |
493 | } | |
494 | ||
495 | /** | |
496 | * mei_cl_read_cb_flush - free client's read pending and completed cbs | |
497 | * for a specific file | |
498 | * | |
499 | * @cl: host client | |
500 | * @fp: file pointer (matching cb file object), may be NULL | |
501 | */ | |
502 | void mei_cl_read_cb_flush(const struct mei_cl *cl, const struct file *fp) | |
503 | { | |
504 | struct mei_cl_cb *cb, *next; | |
505 | ||
506 | list_for_each_entry_safe(cb, next, &cl->rd_completed, list) | |
62e8e6ad | 507 | if (!fp || fp == cb->fp) |
a9bed610 TW |
508 | mei_io_cb_free(cb); |
509 | ||
510 | ||
511 | list_for_each_entry_safe(cb, next, &cl->rd_pending, list) | |
62e8e6ad | 512 | if (!fp || fp == cb->fp) |
a9bed610 TW |
513 | mei_io_cb_free(cb); |
514 | } | |
515 | ||
9ca9050b TW |
516 | /** |
517 | * mei_cl_flush_queues - flushes queue lists belonging to cl. | |
518 | * | |
9ca9050b | 519 | * @cl: host client |
a9bed610 | 520 | * @fp: file pointer (matching cb file object), may be NULL |
ce23139c AU |
521 | * |
522 | * Return: 0 on success, -EINVAL if cl or cl->dev is NULL. | |
9ca9050b | 523 | */ |
a9bed610 | 524 | int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp) |
9ca9050b | 525 | { |
c0abffbd AU |
526 | struct mei_device *dev; |
527 | ||
90e0b5f1 | 528 | if (WARN_ON(!cl || !cl->dev)) |
9ca9050b TW |
529 | return -EINVAL; |
530 | ||
c0abffbd AU |
531 | dev = cl->dev; |
532 | ||
533 | cl_dbg(dev, cl, "remove list entry belonging to cl\n"); | |
cc99ecfd TW |
534 | mei_io_list_free(&cl->dev->write_list, cl); |
535 | mei_io_list_free(&cl->dev->write_waiting_list, cl); | |
9ca9050b TW |
536 | mei_io_list_flush(&cl->dev->ctrl_wr_list, cl); |
537 | mei_io_list_flush(&cl->dev->ctrl_rd_list, cl); | |
538 | mei_io_list_flush(&cl->dev->amthif_cmd_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); | |
b38a362f | 558 | init_waitqueue_head(&cl->ev_wait); |
a9bed610 TW |
559 | INIT_LIST_HEAD(&cl->rd_completed); |
560 | INIT_LIST_HEAD(&cl->rd_pending); | |
9ca9050b | 561 | INIT_LIST_HEAD(&cl->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 |
393b148f | 590 | * |
a8605ea2 | 591 | * Return: 0 on success |
9ca9050b | 592 | * -EINVAL on incorrect values |
03b8d341 | 593 | * -EMFILE if open count exceeded. |
9ca9050b | 594 | */ |
7851e008 | 595 | int mei_cl_link(struct mei_cl *cl) |
9ca9050b | 596 | { |
90e0b5f1 | 597 | struct mei_device *dev; |
22f96a0e | 598 | long open_handle_count; |
7851e008 | 599 | int id; |
9ca9050b | 600 | |
781d0d89 | 601 | if (WARN_ON(!cl || !cl->dev)) |
9ca9050b TW |
602 | return -EINVAL; |
603 | ||
90e0b5f1 TW |
604 | dev = cl->dev; |
605 | ||
7851e008 | 606 | id = find_first_zero_bit(dev->host_clients_map, MEI_CLIENTS_MAX); |
781d0d89 | 607 | if (id >= MEI_CLIENTS_MAX) { |
2bf94cab | 608 | dev_err(dev->dev, "id exceeded %d", MEI_CLIENTS_MAX); |
e036cc57 TW |
609 | return -EMFILE; |
610 | } | |
611 | ||
22f96a0e TW |
612 | open_handle_count = dev->open_handle_count + dev->iamthif_open_count; |
613 | if (open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) { | |
2bf94cab | 614 | dev_err(dev->dev, "open_handle_count exceeded %d", |
e036cc57 TW |
615 | MEI_MAX_OPEN_HANDLE_COUNT); |
616 | return -EMFILE; | |
9ca9050b TW |
617 | } |
618 | ||
781d0d89 TW |
619 | dev->open_handle_count++; |
620 | ||
621 | cl->host_client_id = id; | |
622 | list_add_tail(&cl->link, &dev->file_list); | |
623 | ||
624 | set_bit(id, dev->host_clients_map); | |
625 | ||
626 | cl->state = MEI_FILE_INITIALIZING; | |
627 | ||
c0abffbd | 628 | cl_dbg(dev, cl, "link cl\n"); |
781d0d89 | 629 | return 0; |
9ca9050b | 630 | } |
781d0d89 | 631 | |
9ca9050b | 632 | /** |
d49ed64a | 633 | * mei_cl_unlink - remove host client from the list |
9ca9050b | 634 | * |
393b148f | 635 | * @cl: host client |
ce23139c AU |
636 | * |
637 | * Return: always 0 | |
9ca9050b | 638 | */ |
90e0b5f1 | 639 | int mei_cl_unlink(struct mei_cl *cl) |
9ca9050b | 640 | { |
90e0b5f1 | 641 | struct mei_device *dev; |
90e0b5f1 | 642 | |
781d0d89 TW |
643 | /* don't shout on error exit path */ |
644 | if (!cl) | |
645 | return 0; | |
646 | ||
fdd9b865 | 647 | /* amthif might not be initialized */ |
8e9a4a9a TW |
648 | if (!cl->dev) |
649 | return 0; | |
90e0b5f1 TW |
650 | |
651 | dev = cl->dev; | |
652 | ||
a14c44d8 TW |
653 | cl_dbg(dev, cl, "unlink client"); |
654 | ||
22f96a0e TW |
655 | if (dev->open_handle_count > 0) |
656 | dev->open_handle_count--; | |
657 | ||
658 | /* never clear the 0 bit */ | |
659 | if (cl->host_client_id) | |
660 | clear_bit(cl->host_client_id, dev->host_clients_map); | |
661 | ||
662 | list_del_init(&cl->link); | |
663 | ||
664 | cl->state = MEI_FILE_INITIALIZING; | |
665 | ||
90e0b5f1 | 666 | return 0; |
9ca9050b TW |
667 | } |
668 | ||
025fb792 | 669 | void mei_host_client_init(struct mei_device *dev) |
9ca9050b | 670 | { |
9ca9050b | 671 | dev->dev_state = MEI_DEV_ENABLED; |
6adb8efb | 672 | dev->reset_count = 0; |
04bb139a | 673 | |
025fb792 | 674 | schedule_work(&dev->bus_rescan_work); |
6009595a | 675 | |
2bf94cab TW |
676 | pm_runtime_mark_last_busy(dev->dev); |
677 | dev_dbg(dev->dev, "rpm: autosuspend\n"); | |
678 | pm_runtime_autosuspend(dev->dev); | |
9ca9050b TW |
679 | } |
680 | ||
6aae48ff | 681 | /** |
a8605ea2 | 682 | * mei_hbuf_acquire - try to acquire host buffer |
6aae48ff TW |
683 | * |
684 | * @dev: the device structure | |
a8605ea2 | 685 | * Return: true if host buffer was acquired |
6aae48ff TW |
686 | */ |
687 | bool mei_hbuf_acquire(struct mei_device *dev) | |
688 | { | |
04bb139a | 689 | if (mei_pg_state(dev) == MEI_PG_ON || |
3dc196ea | 690 | mei_pg_in_transition(dev)) { |
2bf94cab | 691 | dev_dbg(dev->dev, "device is in pg\n"); |
04bb139a TW |
692 | return false; |
693 | } | |
694 | ||
6aae48ff | 695 | if (!dev->hbuf_is_ready) { |
2bf94cab | 696 | dev_dbg(dev->dev, "hbuf is not ready\n"); |
6aae48ff TW |
697 | return false; |
698 | } | |
699 | ||
700 | dev->hbuf_is_ready = false; | |
701 | ||
702 | return true; | |
703 | } | |
9ca9050b | 704 | |
a4307fe4 AU |
705 | /** |
706 | * mei_cl_wake_all - wake up readers, writers and event waiters so | |
707 | * they can be interrupted | |
708 | * | |
709 | * @cl: host client | |
710 | */ | |
711 | static void mei_cl_wake_all(struct mei_cl *cl) | |
712 | { | |
713 | struct mei_device *dev = cl->dev; | |
714 | ||
715 | /* synchronized under device mutex */ | |
716 | if (waitqueue_active(&cl->rx_wait)) { | |
717 | cl_dbg(dev, cl, "Waking up reading client!\n"); | |
718 | wake_up_interruptible(&cl->rx_wait); | |
719 | } | |
720 | /* synchronized under device mutex */ | |
721 | if (waitqueue_active(&cl->tx_wait)) { | |
722 | cl_dbg(dev, cl, "Waking up writing client!\n"); | |
723 | wake_up_interruptible(&cl->tx_wait); | |
724 | } | |
725 | /* synchronized under device mutex */ | |
726 | if (waitqueue_active(&cl->ev_wait)) { | |
727 | cl_dbg(dev, cl, "Waking up waiting for event clients!\n"); | |
728 | wake_up_interruptible(&cl->ev_wait); | |
729 | } | |
730 | } | |
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; | |
a4307fe4 AU |
747 | mei_io_list_free(&dev->write_list, cl); |
748 | mei_io_list_free(&dev->write_waiting_list, cl); | |
3c666182 TW |
749 | mei_io_list_flush(&dev->ctrl_rd_list, cl); |
750 | mei_io_list_flush(&dev->ctrl_wr_list, cl); | |
a4307fe4 | 751 | mei_cl_wake_all(cl); |
3c666182 TW |
752 | cl->mei_flow_ctrl_creds = 0; |
753 | cl->timer_count = 0; | |
d49ed64a | 754 | |
a03d77f6 AU |
755 | if (!cl->me_cl) |
756 | return; | |
757 | ||
758 | if (!WARN_ON(cl->me_cl->connect_count == 0)) | |
759 | cl->me_cl->connect_count--; | |
760 | ||
c241e9b1 AU |
761 | if (cl->me_cl->connect_count == 0) |
762 | cl->me_cl->mei_flow_ctrl_creds = 0; | |
763 | ||
d49ed64a AU |
764 | mei_me_cl_put(cl->me_cl); |
765 | cl->me_cl = NULL; | |
3c666182 TW |
766 | } |
767 | ||
a03d77f6 AU |
768 | static int mei_cl_set_connecting(struct mei_cl *cl, struct mei_me_client *me_cl) |
769 | { | |
1df629ef | 770 | if (!mei_me_cl_get(me_cl)) |
a03d77f6 AU |
771 | return -ENOENT; |
772 | ||
1df629ef AU |
773 | /* only one connection is allowed for fixed address clients */ |
774 | if (me_cl->props.fixed_address) { | |
775 | if (me_cl->connect_count) { | |
776 | mei_me_cl_put(me_cl); | |
777 | return -EBUSY; | |
778 | } | |
779 | } | |
780 | ||
781 | cl->me_cl = me_cl; | |
a03d77f6 AU |
782 | cl->state = MEI_FILE_CONNECTING; |
783 | cl->me_cl->connect_count++; | |
784 | ||
785 | return 0; | |
786 | } | |
787 | ||
3c666182 TW |
788 | /* |
789 | * mei_cl_send_disconnect - send disconnect request | |
790 | * | |
791 | * @cl: host client | |
792 | * @cb: callback block | |
793 | * | |
794 | * Return: 0, OK; otherwise, error. | |
795 | */ | |
796 | static int mei_cl_send_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb) | |
797 | { | |
798 | struct mei_device *dev; | |
799 | int ret; | |
800 | ||
801 | dev = cl->dev; | |
802 | ||
803 | ret = mei_hbm_cl_disconnect_req(dev, cl); | |
804 | cl->status = ret; | |
805 | if (ret) { | |
806 | cl->state = MEI_FILE_DISCONNECT_REPLY; | |
807 | return ret; | |
808 | } | |
809 | ||
810 | list_move_tail(&cb->list, &dev->ctrl_rd_list.list); | |
811 | cl->timer_count = MEI_CONNECT_TIMEOUT; | |
812 | ||
813 | return 0; | |
814 | } | |
815 | ||
816 | /** | |
817 | * mei_cl_irq_disconnect - processes close related operation from | |
818 | * interrupt thread context - send disconnect request | |
819 | * | |
820 | * @cl: client | |
821 | * @cb: callback block. | |
822 | * @cmpl_list: complete list. | |
823 | * | |
824 | * Return: 0, OK; otherwise, error. | |
825 | */ | |
826 | int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb, | |
827 | struct mei_cl_cb *cmpl_list) | |
828 | { | |
829 | struct mei_device *dev = cl->dev; | |
830 | u32 msg_slots; | |
831 | int slots; | |
832 | int ret; | |
833 | ||
834 | msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request)); | |
835 | slots = mei_hbuf_empty_slots(dev); | |
836 | ||
837 | if (slots < msg_slots) | |
838 | return -EMSGSIZE; | |
839 | ||
840 | ret = mei_cl_send_disconnect(cl, cb); | |
841 | if (ret) | |
842 | list_move_tail(&cb->list, &cmpl_list->list); | |
843 | ||
844 | return ret; | |
845 | } | |
846 | ||
9ca9050b | 847 | /** |
18901357 AU |
848 | * __mei_cl_disconnect - disconnect host client from the me one |
849 | * internal function runtime pm has to be already acquired | |
9ca9050b | 850 | * |
90e0b5f1 | 851 | * @cl: host client |
9ca9050b | 852 | * |
a8605ea2 | 853 | * Return: 0 on success, <0 on failure. |
9ca9050b | 854 | */ |
18901357 | 855 | static int __mei_cl_disconnect(struct mei_cl *cl) |
9ca9050b | 856 | { |
90e0b5f1 | 857 | struct mei_device *dev; |
9ca9050b | 858 | struct mei_cl_cb *cb; |
fe2f17eb | 859 | int rets; |
9ca9050b | 860 | |
90e0b5f1 TW |
861 | dev = cl->dev; |
862 | ||
3c666182 TW |
863 | cl->state = MEI_FILE_DISCONNECTING; |
864 | ||
bca67d68 TW |
865 | cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT, NULL); |
866 | rets = cb ? 0 : -ENOMEM; | |
867 | if (rets) | |
3c666182 TW |
868 | goto out; |
869 | ||
870 | cl_dbg(dev, cl, "add disconnect cb to control write list\n"); | |
871 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); | |
5a8373fb | 872 | |
6aae48ff | 873 | if (mei_hbuf_acquire(dev)) { |
3c666182 TW |
874 | rets = mei_cl_send_disconnect(cl, cb); |
875 | if (rets) { | |
c0abffbd | 876 | cl_err(dev, cl, "failed to disconnect.\n"); |
3c666182 | 877 | goto out; |
9ca9050b | 878 | } |
9ca9050b | 879 | } |
9ca9050b | 880 | |
3c666182 TW |
881 | mutex_unlock(&dev->device_lock); |
882 | wait_event_timeout(cl->wait, cl->state == MEI_FILE_DISCONNECT_REPLY, | |
883 | mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); | |
9ca9050b | 884 | mutex_lock(&dev->device_lock); |
fe2f17eb | 885 | |
3c666182 TW |
886 | rets = cl->status; |
887 | if (cl->state != MEI_FILE_DISCONNECT_REPLY) { | |
fe2f17eb AU |
888 | cl_dbg(dev, cl, "timeout on disconnect from FW client.\n"); |
889 | rets = -ETIME; | |
9ca9050b TW |
890 | } |
891 | ||
3c666182 TW |
892 | out: |
893 | /* we disconnect also on error */ | |
894 | mei_cl_set_disconnected(cl); | |
895 | if (!rets) | |
896 | cl_dbg(dev, cl, "successfully disconnected from FW client.\n"); | |
897 | ||
18901357 AU |
898 | mei_io_cb_free(cb); |
899 | return rets; | |
900 | } | |
901 | ||
902 | /** | |
903 | * mei_cl_disconnect - disconnect host client from the me one | |
904 | * | |
905 | * @cl: host client | |
906 | * | |
907 | * Locking: called under "dev->device_lock" lock | |
908 | * | |
909 | * Return: 0 on success, <0 on failure. | |
910 | */ | |
911 | int mei_cl_disconnect(struct mei_cl *cl) | |
912 | { | |
913 | struct mei_device *dev; | |
914 | int rets; | |
915 | ||
916 | if (WARN_ON(!cl || !cl->dev)) | |
917 | return -ENODEV; | |
918 | ||
919 | dev = cl->dev; | |
920 | ||
921 | cl_dbg(dev, cl, "disconnecting"); | |
922 | ||
923 | if (!mei_cl_is_connected(cl)) | |
924 | return 0; | |
925 | ||
926 | if (mei_cl_is_fixed_address(cl)) { | |
927 | mei_cl_set_disconnected(cl); | |
928 | return 0; | |
929 | } | |
930 | ||
931 | rets = pm_runtime_get(dev->dev); | |
932 | if (rets < 0 && rets != -EINPROGRESS) { | |
933 | pm_runtime_put_noidle(dev->dev); | |
934 | cl_err(dev, cl, "rpm: get failed %d\n", rets); | |
935 | return rets; | |
936 | } | |
937 | ||
938 | rets = __mei_cl_disconnect(cl); | |
939 | ||
04bb139a | 940 | cl_dbg(dev, cl, "rpm: autosuspend\n"); |
2bf94cab TW |
941 | pm_runtime_mark_last_busy(dev->dev); |
942 | pm_runtime_put_autosuspend(dev->dev); | |
04bb139a | 943 | |
9ca9050b TW |
944 | return rets; |
945 | } | |
946 | ||
947 | ||
948 | /** | |
90e0b5f1 TW |
949 | * mei_cl_is_other_connecting - checks if other |
950 | * client with the same me client id is connecting | |
9ca9050b | 951 | * |
9ca9050b TW |
952 | * @cl: private data of the file object |
953 | * | |
a8605ea2 | 954 | * Return: true if other client is connected, false - otherwise. |
9ca9050b | 955 | */ |
0c53357c | 956 | static bool mei_cl_is_other_connecting(struct mei_cl *cl) |
9ca9050b | 957 | { |
90e0b5f1 | 958 | struct mei_device *dev; |
0c53357c | 959 | struct mei_cl_cb *cb; |
90e0b5f1 TW |
960 | |
961 | dev = cl->dev; | |
962 | ||
0c53357c TW |
963 | list_for_each_entry(cb, &dev->ctrl_rd_list.list, list) { |
964 | if (cb->fop_type == MEI_FOP_CONNECT && | |
d49ed64a | 965 | mei_cl_me_id(cl) == mei_cl_me_id(cb->cl)) |
90e0b5f1 | 966 | return true; |
9ca9050b | 967 | } |
90e0b5f1 TW |
968 | |
969 | return false; | |
9ca9050b TW |
970 | } |
971 | ||
0c53357c TW |
972 | /** |
973 | * mei_cl_send_connect - send connect request | |
974 | * | |
975 | * @cl: host client | |
976 | * @cb: callback block | |
977 | * | |
978 | * Return: 0, OK; otherwise, error. | |
979 | */ | |
980 | static int mei_cl_send_connect(struct mei_cl *cl, struct mei_cl_cb *cb) | |
981 | { | |
982 | struct mei_device *dev; | |
983 | int ret; | |
984 | ||
985 | dev = cl->dev; | |
986 | ||
987 | ret = mei_hbm_cl_connect_req(dev, cl); | |
988 | cl->status = ret; | |
989 | if (ret) { | |
990 | cl->state = MEI_FILE_DISCONNECT_REPLY; | |
991 | return ret; | |
992 | } | |
993 | ||
994 | list_move_tail(&cb->list, &dev->ctrl_rd_list.list); | |
995 | cl->timer_count = MEI_CONNECT_TIMEOUT; | |
996 | return 0; | |
997 | } | |
998 | ||
999 | /** | |
1000 | * mei_cl_irq_connect - send connect request in irq_thread context | |
1001 | * | |
1002 | * @cl: host client | |
1003 | * @cb: callback block | |
1004 | * @cmpl_list: complete list | |
1005 | * | |
1006 | * Return: 0, OK; otherwise, error. | |
1007 | */ | |
1008 | int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb, | |
1009 | struct mei_cl_cb *cmpl_list) | |
1010 | { | |
1011 | struct mei_device *dev = cl->dev; | |
1012 | u32 msg_slots; | |
1013 | int slots; | |
1014 | int rets; | |
1015 | ||
1016 | msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request)); | |
1017 | slots = mei_hbuf_empty_slots(dev); | |
1018 | ||
1019 | if (mei_cl_is_other_connecting(cl)) | |
1020 | return 0; | |
1021 | ||
1022 | if (slots < msg_slots) | |
1023 | return -EMSGSIZE; | |
1024 | ||
1025 | rets = mei_cl_send_connect(cl, cb); | |
1026 | if (rets) | |
1027 | list_move_tail(&cb->list, &cmpl_list->list); | |
1028 | ||
1029 | return rets; | |
1030 | } | |
1031 | ||
9f81abda | 1032 | /** |
83ce0741 | 1033 | * mei_cl_connect - connect host client to the me one |
9f81abda TW |
1034 | * |
1035 | * @cl: host client | |
d49ed64a | 1036 | * @me_cl: me client |
a8605ea2 | 1037 | * @file: pointer to file structure |
9f81abda TW |
1038 | * |
1039 | * Locking: called under "dev->device_lock" lock | |
1040 | * | |
a8605ea2 | 1041 | * Return: 0 on success, <0 on failure. |
9f81abda | 1042 | */ |
d49ed64a | 1043 | int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl, |
f23e2cc4 | 1044 | const struct file *file) |
9f81abda TW |
1045 | { |
1046 | struct mei_device *dev; | |
1047 | struct mei_cl_cb *cb; | |
9f81abda TW |
1048 | int rets; |
1049 | ||
1df629ef | 1050 | if (WARN_ON(!cl || !cl->dev || !me_cl)) |
9f81abda TW |
1051 | return -ENODEV; |
1052 | ||
1053 | dev = cl->dev; | |
1054 | ||
1df629ef AU |
1055 | rets = mei_cl_set_connecting(cl, me_cl); |
1056 | if (rets) | |
1057 | return rets; | |
1058 | ||
1059 | if (mei_cl_is_fixed_address(cl)) { | |
1060 | cl->state = MEI_FILE_CONNECTED; | |
1061 | return 0; | |
1062 | } | |
1063 | ||
2bf94cab | 1064 | rets = pm_runtime_get(dev->dev); |
04bb139a | 1065 | if (rets < 0 && rets != -EINPROGRESS) { |
2bf94cab | 1066 | pm_runtime_put_noidle(dev->dev); |
04bb139a | 1067 | cl_err(dev, cl, "rpm: get failed %d\n", rets); |
1df629ef | 1068 | goto nortpm; |
04bb139a TW |
1069 | } |
1070 | ||
bca67d68 TW |
1071 | cb = mei_io_cb_init(cl, MEI_FOP_CONNECT, file); |
1072 | rets = cb ? 0 : -ENOMEM; | |
1073 | if (rets) | |
9f81abda | 1074 | goto out; |
9f81abda | 1075 | |
0c53357c TW |
1076 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); |
1077 | ||
6aae48ff TW |
1078 | /* run hbuf acquire last so we don't have to undo */ |
1079 | if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) { | |
0c53357c TW |
1080 | rets = mei_cl_send_connect(cl, cb); |
1081 | if (rets) | |
9f81abda | 1082 | goto out; |
9f81abda TW |
1083 | } |
1084 | ||
1085 | mutex_unlock(&dev->device_lock); | |
12f45ed4 | 1086 | wait_event_timeout(cl->wait, |
285e2996 | 1087 | (cl->state == MEI_FILE_CONNECTED || |
18901357 | 1088 | cl->state == MEI_FILE_DISCONNECT_REQUIRED || |
3c666182 | 1089 | cl->state == MEI_FILE_DISCONNECT_REPLY), |
285e2996 | 1090 | mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); |
9f81abda TW |
1091 | mutex_lock(&dev->device_lock); |
1092 | ||
f3de9b63 | 1093 | if (!mei_cl_is_connected(cl)) { |
18901357 AU |
1094 | if (cl->state == MEI_FILE_DISCONNECT_REQUIRED) { |
1095 | mei_io_list_flush(&dev->ctrl_rd_list, cl); | |
1096 | mei_io_list_flush(&dev->ctrl_wr_list, cl); | |
1097 | /* ignore disconnect return valuue; | |
1098 | * in case of failure reset will be invoked | |
1099 | */ | |
1100 | __mei_cl_disconnect(cl); | |
1101 | rets = -EFAULT; | |
1102 | goto out; | |
1103 | } | |
1104 | ||
0c53357c | 1105 | /* timeout or something went really wrong */ |
285e2996 AU |
1106 | if (!cl->status) |
1107 | cl->status = -EFAULT; | |
9f81abda TW |
1108 | } |
1109 | ||
1110 | rets = cl->status; | |
9f81abda | 1111 | out: |
04bb139a | 1112 | cl_dbg(dev, cl, "rpm: autosuspend\n"); |
2bf94cab TW |
1113 | pm_runtime_mark_last_busy(dev->dev); |
1114 | pm_runtime_put_autosuspend(dev->dev); | |
04bb139a | 1115 | |
9f81abda | 1116 | mei_io_cb_free(cb); |
0c53357c | 1117 | |
1df629ef | 1118 | nortpm: |
0c53357c TW |
1119 | if (!mei_cl_is_connected(cl)) |
1120 | mei_cl_set_disconnected(cl); | |
1121 | ||
9f81abda TW |
1122 | return rets; |
1123 | } | |
1124 | ||
03b8d341 TW |
1125 | /** |
1126 | * mei_cl_alloc_linked - allocate and link host client | |
1127 | * | |
1128 | * @dev: the device structure | |
03b8d341 TW |
1129 | * |
1130 | * Return: cl on success ERR_PTR on failure | |
1131 | */ | |
7851e008 | 1132 | struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev) |
03b8d341 TW |
1133 | { |
1134 | struct mei_cl *cl; | |
1135 | int ret; | |
1136 | ||
1137 | cl = mei_cl_allocate(dev); | |
1138 | if (!cl) { | |
1139 | ret = -ENOMEM; | |
1140 | goto err; | |
1141 | } | |
1142 | ||
7851e008 | 1143 | ret = mei_cl_link(cl); |
03b8d341 TW |
1144 | if (ret) |
1145 | goto err; | |
1146 | ||
1147 | return cl; | |
1148 | err: | |
1149 | kfree(cl); | |
1150 | return ERR_PTR(ret); | |
1151 | } | |
1152 | ||
1153 | ||
1154 | ||
9ca9050b | 1155 | /** |
90e0b5f1 | 1156 | * mei_cl_flow_ctrl_creds - checks flow_control credits for cl. |
9ca9050b | 1157 | * |
06ee536b AU |
1158 | * @cl: host client |
1159 | * @fp: the file pointer associated with the pointer | |
9ca9050b | 1160 | * |
a8605ea2 | 1161 | * Return: 1 if mei_flow_ctrl_creds >0, 0 - otherwise. |
9ca9050b | 1162 | */ |
06ee536b | 1163 | static int mei_cl_flow_ctrl_creds(struct mei_cl *cl, const struct file *fp) |
9ca9050b | 1164 | { |
1df629ef AU |
1165 | int rets; |
1166 | ||
d49ed64a | 1167 | if (WARN_ON(!cl || !cl->me_cl)) |
90e0b5f1 TW |
1168 | return -EINVAL; |
1169 | ||
9ca9050b TW |
1170 | if (cl->mei_flow_ctrl_creds > 0) |
1171 | return 1; | |
1172 | ||
1df629ef | 1173 | if (mei_cl_is_fixed_address(cl)) { |
06ee536b | 1174 | rets = mei_cl_read_start(cl, mei_cl_mtu(cl), fp); |
1df629ef AU |
1175 | if (rets && rets != -EBUSY) |
1176 | return rets; | |
1177 | return 1; | |
1178 | } | |
1179 | ||
d49ed64a AU |
1180 | if (mei_cl_is_single_recv_buf(cl)) { |
1181 | if (cl->me_cl->mei_flow_ctrl_creds > 0) | |
1182 | return 1; | |
9ca9050b | 1183 | } |
d49ed64a | 1184 | return 0; |
9ca9050b TW |
1185 | } |
1186 | ||
1187 | /** | |
90e0b5f1 | 1188 | * mei_cl_flow_ctrl_reduce - reduces flow_control. |
9ca9050b | 1189 | * |
9ca9050b | 1190 | * @cl: private data of the file object |
393b148f | 1191 | * |
a8605ea2 | 1192 | * Return: |
9ca9050b | 1193 | * 0 on success |
9ca9050b TW |
1194 | * -EINVAL when ctrl credits are <= 0 |
1195 | */ | |
fdd9b865 | 1196 | static int mei_cl_flow_ctrl_reduce(struct mei_cl *cl) |
9ca9050b | 1197 | { |
d49ed64a | 1198 | if (WARN_ON(!cl || !cl->me_cl)) |
90e0b5f1 TW |
1199 | return -EINVAL; |
1200 | ||
1df629ef AU |
1201 | if (mei_cl_is_fixed_address(cl)) |
1202 | return 0; | |
1203 | ||
d49ed64a AU |
1204 | if (mei_cl_is_single_recv_buf(cl)) { |
1205 | if (WARN_ON(cl->me_cl->mei_flow_ctrl_creds <= 0)) | |
1206 | return -EINVAL; | |
1207 | cl->me_cl->mei_flow_ctrl_creds--; | |
12d00665 | 1208 | } else { |
d49ed64a AU |
1209 | if (WARN_ON(cl->mei_flow_ctrl_creds <= 0)) |
1210 | return -EINVAL; | |
12d00665 | 1211 | cl->mei_flow_ctrl_creds--; |
9ca9050b | 1212 | } |
d49ed64a | 1213 | return 0; |
9ca9050b TW |
1214 | } |
1215 | ||
51678ccb TW |
1216 | /** |
1217 | * mei_cl_notify_fop2req - convert fop to proper request | |
1218 | * | |
1219 | * @fop: client notification start response command | |
1220 | * | |
1221 | * Return: MEI_HBM_NOTIFICATION_START/STOP | |
1222 | */ | |
1223 | u8 mei_cl_notify_fop2req(enum mei_cb_file_ops fop) | |
1224 | { | |
1225 | if (fop == MEI_FOP_NOTIFY_START) | |
1226 | return MEI_HBM_NOTIFICATION_START; | |
1227 | else | |
1228 | return MEI_HBM_NOTIFICATION_STOP; | |
1229 | } | |
1230 | ||
1231 | /** | |
1232 | * mei_cl_notify_req2fop - convert notification request top file operation type | |
1233 | * | |
1234 | * @req: hbm notification request type | |
1235 | * | |
1236 | * Return: MEI_FOP_NOTIFY_START/STOP | |
1237 | */ | |
1238 | enum mei_cb_file_ops mei_cl_notify_req2fop(u8 req) | |
1239 | { | |
1240 | if (req == MEI_HBM_NOTIFICATION_START) | |
1241 | return MEI_FOP_NOTIFY_START; | |
1242 | else | |
1243 | return MEI_FOP_NOTIFY_STOP; | |
1244 | } | |
1245 | ||
1246 | /** | |
1247 | * mei_cl_irq_notify - send notification request in irq_thread context | |
1248 | * | |
1249 | * @cl: client | |
1250 | * @cb: callback block. | |
1251 | * @cmpl_list: complete list. | |
1252 | * | |
1253 | * Return: 0 on such and error otherwise. | |
1254 | */ | |
1255 | int mei_cl_irq_notify(struct mei_cl *cl, struct mei_cl_cb *cb, | |
1256 | struct mei_cl_cb *cmpl_list) | |
1257 | { | |
1258 | struct mei_device *dev = cl->dev; | |
1259 | u32 msg_slots; | |
1260 | int slots; | |
1261 | int ret; | |
1262 | bool request; | |
1263 | ||
1264 | msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request)); | |
1265 | slots = mei_hbuf_empty_slots(dev); | |
1266 | ||
1267 | if (slots < msg_slots) | |
1268 | return -EMSGSIZE; | |
1269 | ||
1270 | request = mei_cl_notify_fop2req(cb->fop_type); | |
1271 | ret = mei_hbm_cl_notify_req(dev, cl, request); | |
1272 | if (ret) { | |
1273 | cl->status = ret; | |
1274 | list_move_tail(&cb->list, &cmpl_list->list); | |
1275 | return ret; | |
1276 | } | |
1277 | ||
1278 | list_move_tail(&cb->list, &dev->ctrl_rd_list.list); | |
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | /** | |
1283 | * mei_cl_notify_request - send notification stop/start request | |
1284 | * | |
1285 | * @cl: host client | |
1286 | * @file: associate request with file | |
1287 | * @request: 1 for start or 0 for stop | |
1288 | * | |
1289 | * Locking: called under "dev->device_lock" lock | |
1290 | * | |
1291 | * Return: 0 on such and error otherwise. | |
1292 | */ | |
f23e2cc4 TW |
1293 | int mei_cl_notify_request(struct mei_cl *cl, |
1294 | const struct file *file, u8 request) | |
51678ccb TW |
1295 | { |
1296 | struct mei_device *dev; | |
1297 | struct mei_cl_cb *cb; | |
1298 | enum mei_cb_file_ops fop_type; | |
1299 | int rets; | |
1300 | ||
1301 | if (WARN_ON(!cl || !cl->dev)) | |
1302 | return -ENODEV; | |
1303 | ||
1304 | dev = cl->dev; | |
1305 | ||
1306 | if (!dev->hbm_f_ev_supported) { | |
1307 | cl_dbg(dev, cl, "notifications not supported\n"); | |
1308 | return -EOPNOTSUPP; | |
1309 | } | |
1310 | ||
1311 | rets = pm_runtime_get(dev->dev); | |
1312 | if (rets < 0 && rets != -EINPROGRESS) { | |
1313 | pm_runtime_put_noidle(dev->dev); | |
1314 | cl_err(dev, cl, "rpm: get failed %d\n", rets); | |
1315 | return rets; | |
1316 | } | |
1317 | ||
1318 | fop_type = mei_cl_notify_req2fop(request); | |
1319 | cb = mei_io_cb_init(cl, fop_type, file); | |
1320 | if (!cb) { | |
1321 | rets = -ENOMEM; | |
1322 | goto out; | |
1323 | } | |
1324 | ||
1325 | if (mei_hbuf_acquire(dev)) { | |
1326 | if (mei_hbm_cl_notify_req(dev, cl, request)) { | |
1327 | rets = -ENODEV; | |
1328 | goto out; | |
1329 | } | |
1330 | list_add_tail(&cb->list, &dev->ctrl_rd_list.list); | |
1331 | } else { | |
1332 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); | |
1333 | } | |
1334 | ||
1335 | mutex_unlock(&dev->device_lock); | |
1336 | wait_event_timeout(cl->wait, cl->notify_en == request, | |
1337 | mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); | |
1338 | mutex_lock(&dev->device_lock); | |
1339 | ||
4a8eaa96 AU |
1340 | if (cl->notify_en != request && !cl->status) |
1341 | cl->status = -EFAULT; | |
51678ccb TW |
1342 | |
1343 | rets = cl->status; | |
1344 | ||
1345 | out: | |
1346 | cl_dbg(dev, cl, "rpm: autosuspend\n"); | |
1347 | pm_runtime_mark_last_busy(dev->dev); | |
1348 | pm_runtime_put_autosuspend(dev->dev); | |
1349 | ||
1350 | mei_io_cb_free(cb); | |
1351 | return rets; | |
1352 | } | |
1353 | ||
237092bf TW |
1354 | /** |
1355 | * mei_cl_notify - raise notification | |
1356 | * | |
1357 | * @cl: host client | |
1358 | * | |
1359 | * Locking: called under "dev->device_lock" lock | |
1360 | */ | |
1361 | void mei_cl_notify(struct mei_cl *cl) | |
1362 | { | |
1363 | struct mei_device *dev; | |
1364 | ||
1365 | if (!cl || !cl->dev) | |
1366 | return; | |
1367 | ||
1368 | dev = cl->dev; | |
1369 | ||
1370 | if (!cl->notify_en) | |
1371 | return; | |
1372 | ||
1373 | cl_dbg(dev, cl, "notify event"); | |
1374 | cl->notify_ev = true; | |
850f8940 TW |
1375 | if (!mei_cl_bus_notify_event(cl)) |
1376 | wake_up_interruptible(&cl->ev_wait); | |
237092bf TW |
1377 | |
1378 | if (cl->ev_async) | |
1379 | kill_fasync(&cl->ev_async, SIGIO, POLL_PRI); | |
bb2ef9c3 | 1380 | |
237092bf TW |
1381 | } |
1382 | ||
b38a362f TW |
1383 | /** |
1384 | * mei_cl_notify_get - get or wait for notification event | |
1385 | * | |
1386 | * @cl: host client | |
1387 | * @block: this request is blocking | |
1388 | * @notify_ev: true if notification event was received | |
1389 | * | |
1390 | * Locking: called under "dev->device_lock" lock | |
1391 | * | |
1392 | * Return: 0 on such and error otherwise. | |
1393 | */ | |
1394 | int mei_cl_notify_get(struct mei_cl *cl, bool block, bool *notify_ev) | |
1395 | { | |
1396 | struct mei_device *dev; | |
1397 | int rets; | |
1398 | ||
1399 | *notify_ev = false; | |
1400 | ||
1401 | if (WARN_ON(!cl || !cl->dev)) | |
1402 | return -ENODEV; | |
1403 | ||
1404 | dev = cl->dev; | |
1405 | ||
1406 | if (!mei_cl_is_connected(cl)) | |
1407 | return -ENODEV; | |
1408 | ||
1409 | if (cl->notify_ev) | |
1410 | goto out; | |
1411 | ||
1412 | if (!block) | |
1413 | return -EAGAIN; | |
1414 | ||
1415 | mutex_unlock(&dev->device_lock); | |
1416 | rets = wait_event_interruptible(cl->ev_wait, cl->notify_ev); | |
1417 | mutex_lock(&dev->device_lock); | |
1418 | ||
1419 | if (rets < 0) | |
1420 | return rets; | |
1421 | ||
1422 | out: | |
1423 | *notify_ev = cl->notify_ev; | |
1424 | cl->notify_ev = false; | |
1425 | return 0; | |
1426 | } | |
1427 | ||
13cf9885 AU |
1428 | /** |
1429 | * mei_cl_is_read_fc_cb - check if read cb is waiting for flow control | |
1430 | * for given host client | |
1431 | * | |
1432 | * @cl: host client | |
1433 | * | |
1434 | * Return: true, if found at least one cb. | |
1435 | */ | |
1436 | static bool mei_cl_is_read_fc_cb(struct mei_cl *cl) | |
1437 | { | |
1438 | struct mei_device *dev = cl->dev; | |
1439 | struct mei_cl_cb *cb; | |
1440 | ||
1441 | list_for_each_entry(cb, &dev->ctrl_wr_list.list, list) | |
1442 | if (cb->fop_type == MEI_FOP_READ && cb->cl == cl) | |
1443 | return true; | |
1444 | return false; | |
1445 | } | |
1446 | ||
ab841160 | 1447 | /** |
393b148f | 1448 | * mei_cl_read_start - the start read client message function. |
ab841160 | 1449 | * |
90e0b5f1 | 1450 | * @cl: host client |
ce23139c | 1451 | * @length: number of bytes to read |
bca67d68 | 1452 | * @fp: pointer to file structure |
ab841160 | 1453 | * |
a8605ea2 | 1454 | * Return: 0 on success, <0 on failure. |
ab841160 | 1455 | */ |
f23e2cc4 | 1456 | int mei_cl_read_start(struct mei_cl *cl, size_t length, const struct file *fp) |
ab841160 | 1457 | { |
90e0b5f1 | 1458 | struct mei_device *dev; |
ab841160 | 1459 | struct mei_cl_cb *cb; |
664df38b | 1460 | int rets; |
ab841160 | 1461 | |
90e0b5f1 TW |
1462 | if (WARN_ON(!cl || !cl->dev)) |
1463 | return -ENODEV; | |
1464 | ||
1465 | dev = cl->dev; | |
1466 | ||
b950ac1d | 1467 | if (!mei_cl_is_connected(cl)) |
ab841160 OW |
1468 | return -ENODEV; |
1469 | ||
a9bed610 | 1470 | /* HW currently supports only one pending read */ |
13cf9885 | 1471 | if (!list_empty(&cl->rd_pending) || mei_cl_is_read_fc_cb(cl)) |
ab841160 | 1472 | return -EBUSY; |
a9bed610 | 1473 | |
d49ed64a AU |
1474 | if (!mei_me_cl_is_active(cl->me_cl)) { |
1475 | cl_err(dev, cl, "no such me client\n"); | |
7ca96aa2 | 1476 | return -ENOTTY; |
664df38b | 1477 | } |
1df629ef | 1478 | |
79563db9 | 1479 | /* always allocate at least client max message */ |
d49ed64a | 1480 | length = max_t(size_t, length, mei_cl_mtu(cl)); |
1df629ef AU |
1481 | cb = mei_cl_alloc_cb(cl, length, MEI_FOP_READ, fp); |
1482 | if (!cb) | |
1483 | return -ENOMEM; | |
1484 | ||
1485 | if (mei_cl_is_fixed_address(cl)) { | |
1486 | list_add_tail(&cb->list, &cl->rd_pending); | |
1487 | return 0; | |
1488 | } | |
ab841160 | 1489 | |
2bf94cab | 1490 | rets = pm_runtime_get(dev->dev); |
04bb139a | 1491 | if (rets < 0 && rets != -EINPROGRESS) { |
2bf94cab | 1492 | pm_runtime_put_noidle(dev->dev); |
04bb139a | 1493 | cl_err(dev, cl, "rpm: get failed %d\n", rets); |
1df629ef | 1494 | goto nortpm; |
04bb139a TW |
1495 | } |
1496 | ||
6aae48ff | 1497 | if (mei_hbuf_acquire(dev)) { |
86113500 AU |
1498 | rets = mei_hbm_cl_flow_control_req(dev, cl); |
1499 | if (rets < 0) | |
04bb139a | 1500 | goto out; |
04bb139a | 1501 | |
a9bed610 | 1502 | list_add_tail(&cb->list, &cl->rd_pending); |
ab841160 | 1503 | } else { |
1df629ef | 1504 | rets = 0; |
fb601adb | 1505 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); |
ab841160 | 1506 | } |
accb884b | 1507 | |
04bb139a TW |
1508 | out: |
1509 | cl_dbg(dev, cl, "rpm: autosuspend\n"); | |
2bf94cab TW |
1510 | pm_runtime_mark_last_busy(dev->dev); |
1511 | pm_runtime_put_autosuspend(dev->dev); | |
1df629ef | 1512 | nortpm: |
04bb139a TW |
1513 | if (rets) |
1514 | mei_io_cb_free(cb); | |
1515 | ||
ab841160 OW |
1516 | return rets; |
1517 | } | |
1518 | ||
21767546 | 1519 | /** |
9d098192 | 1520 | * mei_cl_irq_write - write a message to device |
21767546 TW |
1521 | * from the interrupt thread context |
1522 | * | |
1523 | * @cl: client | |
1524 | * @cb: callback block. | |
21767546 TW |
1525 | * @cmpl_list: complete list. |
1526 | * | |
a8605ea2 | 1527 | * Return: 0, OK; otherwise error. |
21767546 | 1528 | */ |
9d098192 TW |
1529 | int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb, |
1530 | struct mei_cl_cb *cmpl_list) | |
21767546 | 1531 | { |
136698e5 TW |
1532 | struct mei_device *dev; |
1533 | struct mei_msg_data *buf; | |
21767546 | 1534 | struct mei_msg_hdr mei_hdr; |
136698e5 TW |
1535 | size_t len; |
1536 | u32 msg_slots; | |
9d098192 | 1537 | int slots; |
2ebf8c94 | 1538 | int rets; |
b8b73035 | 1539 | bool first_chunk; |
21767546 | 1540 | |
136698e5 TW |
1541 | if (WARN_ON(!cl || !cl->dev)) |
1542 | return -ENODEV; | |
1543 | ||
1544 | dev = cl->dev; | |
1545 | ||
5db7514d | 1546 | buf = &cb->buf; |
136698e5 | 1547 | |
b8b73035 AU |
1548 | first_chunk = cb->buf_idx == 0; |
1549 | ||
06ee536b | 1550 | rets = first_chunk ? mei_cl_flow_ctrl_creds(cl, cb->fp) : 1; |
136698e5 TW |
1551 | if (rets < 0) |
1552 | return rets; | |
1553 | ||
1554 | if (rets == 0) { | |
04bb139a | 1555 | cl_dbg(dev, cl, "No flow control credentials: not sending.\n"); |
136698e5 TW |
1556 | return 0; |
1557 | } | |
1558 | ||
9d098192 | 1559 | slots = mei_hbuf_empty_slots(dev); |
136698e5 TW |
1560 | len = buf->size - cb->buf_idx; |
1561 | msg_slots = mei_data2slots(len); | |
1562 | ||
1df629ef | 1563 | mei_hdr.host_addr = mei_cl_host_addr(cl); |
d49ed64a | 1564 | mei_hdr.me_addr = mei_cl_me_id(cl); |
21767546 | 1565 | mei_hdr.reserved = 0; |
479327fc | 1566 | mei_hdr.internal = cb->internal; |
21767546 | 1567 | |
9d098192 | 1568 | if (slots >= msg_slots) { |
21767546 TW |
1569 | mei_hdr.length = len; |
1570 | mei_hdr.msg_complete = 1; | |
1571 | /* Split the message only if we can write the whole host buffer */ | |
9d098192 TW |
1572 | } else if (slots == dev->hbuf_depth) { |
1573 | msg_slots = slots; | |
1574 | len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr); | |
21767546 TW |
1575 | mei_hdr.length = len; |
1576 | mei_hdr.msg_complete = 0; | |
1577 | } else { | |
1578 | /* wait for next time the host buffer is empty */ | |
1579 | return 0; | |
1580 | } | |
1581 | ||
35bf7692 | 1582 | cl_dbg(dev, cl, "buf: size = %zu idx = %zu\n", |
5db7514d | 1583 | cb->buf.size, cb->buf_idx); |
21767546 | 1584 | |
136698e5 | 1585 | rets = mei_write_message(dev, &mei_hdr, buf->data + cb->buf_idx); |
2ebf8c94 TW |
1586 | if (rets) { |
1587 | cl->status = rets; | |
21767546 | 1588 | list_move_tail(&cb->list, &cmpl_list->list); |
2ebf8c94 | 1589 | return rets; |
21767546 TW |
1590 | } |
1591 | ||
1592 | cl->status = 0; | |
4dfaa9f7 | 1593 | cl->writing_state = MEI_WRITING; |
21767546 | 1594 | cb->buf_idx += mei_hdr.length; |
8660172e | 1595 | cb->completed = mei_hdr.msg_complete == 1; |
4dfaa9f7 | 1596 | |
b8b73035 | 1597 | if (first_chunk) { |
21767546 | 1598 | if (mei_cl_flow_ctrl_reduce(cl)) |
2ebf8c94 | 1599 | return -EIO; |
21767546 TW |
1600 | } |
1601 | ||
b8b73035 AU |
1602 | if (mei_hdr.msg_complete) |
1603 | list_move_tail(&cb->list, &dev->write_waiting_list.list); | |
1604 | ||
21767546 TW |
1605 | return 0; |
1606 | } | |
1607 | ||
4234a6de TW |
1608 | /** |
1609 | * mei_cl_write - submit a write cb to mei device | |
a8605ea2 | 1610 | * assumes device_lock is locked |
4234a6de TW |
1611 | * |
1612 | * @cl: host client | |
a8605ea2 | 1613 | * @cb: write callback with filled data |
ce23139c | 1614 | * @blocking: block until completed |
4234a6de | 1615 | * |
a8605ea2 | 1616 | * Return: number of bytes sent on success, <0 on failure. |
4234a6de TW |
1617 | */ |
1618 | int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking) | |
1619 | { | |
1620 | struct mei_device *dev; | |
1621 | struct mei_msg_data *buf; | |
1622 | struct mei_msg_hdr mei_hdr; | |
23253c31 | 1623 | int size; |
4234a6de TW |
1624 | int rets; |
1625 | ||
1626 | ||
1627 | if (WARN_ON(!cl || !cl->dev)) | |
1628 | return -ENODEV; | |
1629 | ||
1630 | if (WARN_ON(!cb)) | |
1631 | return -EINVAL; | |
1632 | ||
1633 | dev = cl->dev; | |
1634 | ||
5db7514d | 1635 | buf = &cb->buf; |
23253c31 | 1636 | size = buf->size; |
4234a6de | 1637 | |
23253c31 | 1638 | cl_dbg(dev, cl, "size=%d\n", size); |
4234a6de | 1639 | |
2bf94cab | 1640 | rets = pm_runtime_get(dev->dev); |
04bb139a | 1641 | if (rets < 0 && rets != -EINPROGRESS) { |
2bf94cab | 1642 | pm_runtime_put_noidle(dev->dev); |
04bb139a | 1643 | cl_err(dev, cl, "rpm: get failed %d\n", rets); |
6cbb097f | 1644 | goto free; |
04bb139a | 1645 | } |
4234a6de | 1646 | |
6aae48ff TW |
1647 | cb->buf_idx = 0; |
1648 | cl->writing_state = MEI_IDLE; | |
1649 | ||
1df629ef | 1650 | mei_hdr.host_addr = mei_cl_host_addr(cl); |
d49ed64a | 1651 | mei_hdr.me_addr = mei_cl_me_id(cl); |
6aae48ff TW |
1652 | mei_hdr.reserved = 0; |
1653 | mei_hdr.msg_complete = 0; | |
1654 | mei_hdr.internal = cb->internal; | |
4234a6de | 1655 | |
06ee536b | 1656 | rets = mei_cl_flow_ctrl_creds(cl, cb->fp); |
4234a6de TW |
1657 | if (rets < 0) |
1658 | goto err; | |
1659 | ||
6aae48ff TW |
1660 | if (rets == 0) { |
1661 | cl_dbg(dev, cl, "No flow control credentials: not sending.\n"); | |
23253c31 | 1662 | rets = size; |
6aae48ff TW |
1663 | goto out; |
1664 | } | |
1665 | if (!mei_hbuf_acquire(dev)) { | |
1666 | cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n"); | |
23253c31 | 1667 | rets = size; |
4234a6de TW |
1668 | goto out; |
1669 | } | |
4234a6de TW |
1670 | |
1671 | /* Check for a maximum length */ | |
23253c31 | 1672 | if (size > mei_hbuf_max_len(dev)) { |
4234a6de TW |
1673 | mei_hdr.length = mei_hbuf_max_len(dev); |
1674 | mei_hdr.msg_complete = 0; | |
1675 | } else { | |
23253c31 | 1676 | mei_hdr.length = size; |
4234a6de TW |
1677 | mei_hdr.msg_complete = 1; |
1678 | } | |
1679 | ||
2ebf8c94 TW |
1680 | rets = mei_write_message(dev, &mei_hdr, buf->data); |
1681 | if (rets) | |
4234a6de | 1682 | goto err; |
4234a6de | 1683 | |
b8b73035 AU |
1684 | rets = mei_cl_flow_ctrl_reduce(cl); |
1685 | if (rets) | |
1686 | goto err; | |
1687 | ||
4234a6de TW |
1688 | cl->writing_state = MEI_WRITING; |
1689 | cb->buf_idx = mei_hdr.length; | |
8660172e | 1690 | cb->completed = mei_hdr.msg_complete == 1; |
4234a6de | 1691 | |
4234a6de | 1692 | out: |
b8b73035 | 1693 | if (mei_hdr.msg_complete) |
4234a6de | 1694 | list_add_tail(&cb->list, &dev->write_waiting_list.list); |
b8b73035 | 1695 | else |
4234a6de | 1696 | list_add_tail(&cb->list, &dev->write_list.list); |
4234a6de | 1697 | |
23253c31 | 1698 | cb = NULL; |
4234a6de TW |
1699 | if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) { |
1700 | ||
1701 | mutex_unlock(&dev->device_lock); | |
7ca96aa2 | 1702 | rets = wait_event_interruptible(cl->tx_wait, |
0faf6a3b AU |
1703 | cl->writing_state == MEI_WRITE_COMPLETE || |
1704 | (!mei_cl_is_connected(cl))); | |
4234a6de | 1705 | mutex_lock(&dev->device_lock); |
7ca96aa2 AU |
1706 | /* wait_event_interruptible returns -ERESTARTSYS */ |
1707 | if (rets) { | |
1708 | if (signal_pending(current)) | |
1709 | rets = -EINTR; | |
1710 | goto err; | |
1711 | } | |
0faf6a3b AU |
1712 | if (cl->writing_state != MEI_WRITE_COMPLETE) { |
1713 | rets = -EFAULT; | |
1714 | goto err; | |
1715 | } | |
4234a6de | 1716 | } |
7ca96aa2 | 1717 | |
23253c31 | 1718 | rets = size; |
4234a6de | 1719 | err: |
04bb139a | 1720 | cl_dbg(dev, cl, "rpm: autosuspend\n"); |
2bf94cab TW |
1721 | pm_runtime_mark_last_busy(dev->dev); |
1722 | pm_runtime_put_autosuspend(dev->dev); | |
6cbb097f AU |
1723 | free: |
1724 | mei_io_cb_free(cb); | |
04bb139a | 1725 | |
4234a6de TW |
1726 | return rets; |
1727 | } | |
1728 | ||
1729 | ||
db086fa9 TW |
1730 | /** |
1731 | * mei_cl_complete - processes completed operation for a client | |
1732 | * | |
1733 | * @cl: private data of the file object. | |
1734 | * @cb: callback block. | |
1735 | */ | |
1736 | void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb) | |
1737 | { | |
a1809d38 AU |
1738 | struct mei_device *dev = cl->dev; |
1739 | ||
3c666182 TW |
1740 | switch (cb->fop_type) { |
1741 | case MEI_FOP_WRITE: | |
db086fa9 | 1742 | mei_io_cb_free(cb); |
db086fa9 | 1743 | cl->writing_state = MEI_WRITE_COMPLETE; |
a1809d38 | 1744 | if (waitqueue_active(&cl->tx_wait)) { |
db086fa9 | 1745 | wake_up_interruptible(&cl->tx_wait); |
a1809d38 AU |
1746 | } else { |
1747 | pm_runtime_mark_last_busy(dev->dev); | |
1748 | pm_request_autosuspend(dev->dev); | |
1749 | } | |
3c666182 | 1750 | break; |
db086fa9 | 1751 | |
3c666182 | 1752 | case MEI_FOP_READ: |
a9bed610 | 1753 | list_add_tail(&cb->list, &cl->rd_completed); |
a1f9ae2b TW |
1754 | if (!mei_cl_bus_rx_event(cl)) |
1755 | wake_up_interruptible(&cl->rx_wait); | |
3c666182 TW |
1756 | break; |
1757 | ||
1758 | case MEI_FOP_CONNECT: | |
1759 | case MEI_FOP_DISCONNECT: | |
51678ccb TW |
1760 | case MEI_FOP_NOTIFY_STOP: |
1761 | case MEI_FOP_NOTIFY_START: | |
3c666182 TW |
1762 | if (waitqueue_active(&cl->wait)) |
1763 | wake_up(&cl->wait); | |
db086fa9 | 1764 | |
6a8d648c AU |
1765 | break; |
1766 | case MEI_FOP_DISCONNECT_RSP: | |
1767 | mei_io_cb_free(cb); | |
1768 | mei_cl_set_disconnected(cl); | |
3c666182 TW |
1769 | break; |
1770 | default: | |
1771 | BUG_ON(0); | |
db086fa9 TW |
1772 | } |
1773 | } | |
1774 | ||
4234a6de | 1775 | |
074b4c01 TW |
1776 | /** |
1777 | * mei_cl_all_disconnect - disconnect forcefully all connected clients | |
1778 | * | |
a8605ea2 | 1779 | * @dev: mei device |
074b4c01 | 1780 | */ |
074b4c01 TW |
1781 | void mei_cl_all_disconnect(struct mei_device *dev) |
1782 | { | |
31f88f57 | 1783 | struct mei_cl *cl; |
074b4c01 | 1784 | |
3c666182 TW |
1785 | list_for_each_entry(cl, &dev->file_list, link) |
1786 | mei_cl_set_disconnected(cl); | |
074b4c01 | 1787 | } |