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 | ||
bca67d68 TW |
422 | /** |
423 | * mei_cl_alloc_cb - a convenient wrapper for allocating read cb | |
424 | * | |
425 | * @cl: host client | |
426 | * @length: size of the buffer | |
427 | * @type: operation type | |
428 | * @fp: associated file pointer (might be NULL) | |
429 | * | |
430 | * Return: cb on success and NULL on failure | |
431 | */ | |
432 | struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length, | |
f23e2cc4 TW |
433 | enum mei_cb_file_ops type, |
434 | const struct file *fp) | |
bca67d68 TW |
435 | { |
436 | struct mei_cl_cb *cb; | |
437 | ||
438 | cb = mei_io_cb_init(cl, type, fp); | |
439 | if (!cb) | |
440 | return NULL; | |
441 | ||
aab3b1a3 AU |
442 | if (length == 0) |
443 | return cb; | |
444 | ||
445 | cb->buf.data = kmalloc(length, GFP_KERNEL); | |
446 | if (!cb->buf.data) { | |
bca67d68 TW |
447 | mei_io_cb_free(cb); |
448 | return NULL; | |
449 | } | |
aab3b1a3 | 450 | cb->buf.size = length; |
bca67d68 TW |
451 | |
452 | return cb; | |
453 | } | |
454 | ||
a9bed610 TW |
455 | /** |
456 | * mei_cl_read_cb - find this cl's callback in the read list | |
457 | * for a specific file | |
458 | * | |
459 | * @cl: host client | |
460 | * @fp: file pointer (matching cb file object), may be NULL | |
461 | * | |
462 | * Return: cb on success, NULL if cb is not found | |
463 | */ | |
464 | struct mei_cl_cb *mei_cl_read_cb(const struct mei_cl *cl, const struct file *fp) | |
465 | { | |
466 | struct mei_cl_cb *cb; | |
467 | ||
468 | list_for_each_entry(cb, &cl->rd_completed, list) | |
62e8e6ad | 469 | if (!fp || fp == cb->fp) |
a9bed610 TW |
470 | return cb; |
471 | ||
472 | return NULL; | |
473 | } | |
474 | ||
475 | /** | |
476 | * mei_cl_read_cb_flush - free client's read pending and completed cbs | |
477 | * for a specific file | |
478 | * | |
479 | * @cl: host client | |
480 | * @fp: file pointer (matching cb file object), may be NULL | |
481 | */ | |
482 | void mei_cl_read_cb_flush(const struct mei_cl *cl, const struct file *fp) | |
483 | { | |
484 | struct mei_cl_cb *cb, *next; | |
485 | ||
486 | list_for_each_entry_safe(cb, next, &cl->rd_completed, list) | |
62e8e6ad | 487 | if (!fp || fp == cb->fp) |
a9bed610 TW |
488 | mei_io_cb_free(cb); |
489 | ||
490 | ||
491 | list_for_each_entry_safe(cb, next, &cl->rd_pending, list) | |
62e8e6ad | 492 | if (!fp || fp == cb->fp) |
a9bed610 TW |
493 | mei_io_cb_free(cb); |
494 | } | |
495 | ||
9ca9050b TW |
496 | /** |
497 | * mei_cl_flush_queues - flushes queue lists belonging to cl. | |
498 | * | |
9ca9050b | 499 | * @cl: host client |
a9bed610 | 500 | * @fp: file pointer (matching cb file object), may be NULL |
ce23139c AU |
501 | * |
502 | * Return: 0 on success, -EINVAL if cl or cl->dev is NULL. | |
9ca9050b | 503 | */ |
a9bed610 | 504 | int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp) |
9ca9050b | 505 | { |
c0abffbd AU |
506 | struct mei_device *dev; |
507 | ||
90e0b5f1 | 508 | if (WARN_ON(!cl || !cl->dev)) |
9ca9050b TW |
509 | return -EINVAL; |
510 | ||
c0abffbd AU |
511 | dev = cl->dev; |
512 | ||
513 | cl_dbg(dev, cl, "remove list entry belonging to cl\n"); | |
cc99ecfd TW |
514 | mei_io_list_free(&cl->dev->write_list, cl); |
515 | mei_io_list_free(&cl->dev->write_waiting_list, cl); | |
9ca9050b TW |
516 | mei_io_list_flush(&cl->dev->ctrl_wr_list, cl); |
517 | mei_io_list_flush(&cl->dev->ctrl_rd_list, cl); | |
518 | mei_io_list_flush(&cl->dev->amthif_cmd_list, cl); | |
a9bed610 TW |
519 | |
520 | mei_cl_read_cb_flush(cl, fp); | |
521 | ||
9ca9050b TW |
522 | return 0; |
523 | } | |
524 | ||
ab841160 | 525 | |
9ca9050b | 526 | /** |
83ce0741 | 527 | * mei_cl_init - initializes cl. |
9ca9050b TW |
528 | * |
529 | * @cl: host client to be initialized | |
530 | * @dev: mei device | |
531 | */ | |
532 | void mei_cl_init(struct mei_cl *cl, struct mei_device *dev) | |
533 | { | |
534 | memset(cl, 0, sizeof(struct mei_cl)); | |
535 | init_waitqueue_head(&cl->wait); | |
536 | init_waitqueue_head(&cl->rx_wait); | |
537 | init_waitqueue_head(&cl->tx_wait); | |
b38a362f | 538 | init_waitqueue_head(&cl->ev_wait); |
a9bed610 TW |
539 | INIT_LIST_HEAD(&cl->rd_completed); |
540 | INIT_LIST_HEAD(&cl->rd_pending); | |
9ca9050b | 541 | INIT_LIST_HEAD(&cl->link); |
9ca9050b | 542 | cl->writing_state = MEI_IDLE; |
3c666182 | 543 | cl->state = MEI_FILE_INITIALIZING; |
9ca9050b TW |
544 | cl->dev = dev; |
545 | } | |
546 | ||
547 | /** | |
548 | * mei_cl_allocate - allocates cl structure and sets it up. | |
549 | * | |
550 | * @dev: mei device | |
a8605ea2 | 551 | * Return: The allocated file or NULL on failure |
9ca9050b TW |
552 | */ |
553 | struct mei_cl *mei_cl_allocate(struct mei_device *dev) | |
554 | { | |
555 | struct mei_cl *cl; | |
556 | ||
557 | cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL); | |
558 | if (!cl) | |
559 | return NULL; | |
560 | ||
561 | mei_cl_init(cl, dev); | |
562 | ||
563 | return cl; | |
564 | } | |
565 | ||
3908be6f AU |
566 | /** |
567 | * mei_cl_link - allocate host id in the host map | |
9ca9050b | 568 | * |
3908be6f | 569 | * @cl: host client |
393b148f | 570 | * |
a8605ea2 | 571 | * Return: 0 on success |
9ca9050b | 572 | * -EINVAL on incorrect values |
03b8d341 | 573 | * -EMFILE if open count exceeded. |
9ca9050b | 574 | */ |
7851e008 | 575 | int mei_cl_link(struct mei_cl *cl) |
9ca9050b | 576 | { |
90e0b5f1 | 577 | struct mei_device *dev; |
22f96a0e | 578 | long open_handle_count; |
7851e008 | 579 | int id; |
9ca9050b | 580 | |
781d0d89 | 581 | if (WARN_ON(!cl || !cl->dev)) |
9ca9050b TW |
582 | return -EINVAL; |
583 | ||
90e0b5f1 TW |
584 | dev = cl->dev; |
585 | ||
7851e008 | 586 | id = find_first_zero_bit(dev->host_clients_map, MEI_CLIENTS_MAX); |
781d0d89 | 587 | if (id >= MEI_CLIENTS_MAX) { |
2bf94cab | 588 | dev_err(dev->dev, "id exceeded %d", MEI_CLIENTS_MAX); |
e036cc57 TW |
589 | return -EMFILE; |
590 | } | |
591 | ||
22f96a0e TW |
592 | open_handle_count = dev->open_handle_count + dev->iamthif_open_count; |
593 | if (open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) { | |
2bf94cab | 594 | dev_err(dev->dev, "open_handle_count exceeded %d", |
e036cc57 TW |
595 | MEI_MAX_OPEN_HANDLE_COUNT); |
596 | return -EMFILE; | |
9ca9050b TW |
597 | } |
598 | ||
781d0d89 TW |
599 | dev->open_handle_count++; |
600 | ||
601 | cl->host_client_id = id; | |
602 | list_add_tail(&cl->link, &dev->file_list); | |
603 | ||
604 | set_bit(id, dev->host_clients_map); | |
605 | ||
606 | cl->state = MEI_FILE_INITIALIZING; | |
607 | ||
c0abffbd | 608 | cl_dbg(dev, cl, "link cl\n"); |
781d0d89 | 609 | return 0; |
9ca9050b | 610 | } |
781d0d89 | 611 | |
9ca9050b | 612 | /** |
d49ed64a | 613 | * mei_cl_unlink - remove host client from the list |
9ca9050b | 614 | * |
393b148f | 615 | * @cl: host client |
ce23139c AU |
616 | * |
617 | * Return: always 0 | |
9ca9050b | 618 | */ |
90e0b5f1 | 619 | int mei_cl_unlink(struct mei_cl *cl) |
9ca9050b | 620 | { |
90e0b5f1 | 621 | struct mei_device *dev; |
90e0b5f1 | 622 | |
781d0d89 TW |
623 | /* don't shout on error exit path */ |
624 | if (!cl) | |
625 | return 0; | |
626 | ||
fdd9b865 | 627 | /* amthif might not be initialized */ |
8e9a4a9a TW |
628 | if (!cl->dev) |
629 | return 0; | |
90e0b5f1 TW |
630 | |
631 | dev = cl->dev; | |
632 | ||
a14c44d8 TW |
633 | cl_dbg(dev, cl, "unlink client"); |
634 | ||
22f96a0e TW |
635 | if (dev->open_handle_count > 0) |
636 | dev->open_handle_count--; | |
637 | ||
638 | /* never clear the 0 bit */ | |
639 | if (cl->host_client_id) | |
640 | clear_bit(cl->host_client_id, dev->host_clients_map); | |
641 | ||
642 | list_del_init(&cl->link); | |
643 | ||
644 | cl->state = MEI_FILE_INITIALIZING; | |
645 | ||
90e0b5f1 | 646 | return 0; |
9ca9050b TW |
647 | } |
648 | ||
025fb792 | 649 | void mei_host_client_init(struct mei_device *dev) |
9ca9050b | 650 | { |
9ca9050b | 651 | dev->dev_state = MEI_DEV_ENABLED; |
6adb8efb | 652 | dev->reset_count = 0; |
04bb139a | 653 | |
025fb792 | 654 | schedule_work(&dev->bus_rescan_work); |
6009595a | 655 | |
2bf94cab TW |
656 | pm_runtime_mark_last_busy(dev->dev); |
657 | dev_dbg(dev->dev, "rpm: autosuspend\n"); | |
658 | pm_runtime_autosuspend(dev->dev); | |
9ca9050b TW |
659 | } |
660 | ||
6aae48ff | 661 | /** |
a8605ea2 | 662 | * mei_hbuf_acquire - try to acquire host buffer |
6aae48ff TW |
663 | * |
664 | * @dev: the device structure | |
a8605ea2 | 665 | * Return: true if host buffer was acquired |
6aae48ff TW |
666 | */ |
667 | bool mei_hbuf_acquire(struct mei_device *dev) | |
668 | { | |
04bb139a | 669 | if (mei_pg_state(dev) == MEI_PG_ON || |
3dc196ea | 670 | mei_pg_in_transition(dev)) { |
2bf94cab | 671 | dev_dbg(dev->dev, "device is in pg\n"); |
04bb139a TW |
672 | return false; |
673 | } | |
674 | ||
6aae48ff | 675 | if (!dev->hbuf_is_ready) { |
2bf94cab | 676 | dev_dbg(dev->dev, "hbuf is not ready\n"); |
6aae48ff TW |
677 | return false; |
678 | } | |
679 | ||
680 | dev->hbuf_is_ready = false; | |
681 | ||
682 | return true; | |
683 | } | |
9ca9050b | 684 | |
a4307fe4 AU |
685 | /** |
686 | * mei_cl_wake_all - wake up readers, writers and event waiters so | |
687 | * they can be interrupted | |
688 | * | |
689 | * @cl: host client | |
690 | */ | |
691 | static void mei_cl_wake_all(struct mei_cl *cl) | |
692 | { | |
693 | struct mei_device *dev = cl->dev; | |
694 | ||
695 | /* synchronized under device mutex */ | |
696 | if (waitqueue_active(&cl->rx_wait)) { | |
697 | cl_dbg(dev, cl, "Waking up reading client!\n"); | |
698 | wake_up_interruptible(&cl->rx_wait); | |
699 | } | |
700 | /* synchronized under device mutex */ | |
701 | if (waitqueue_active(&cl->tx_wait)) { | |
702 | cl_dbg(dev, cl, "Waking up writing client!\n"); | |
703 | wake_up_interruptible(&cl->tx_wait); | |
704 | } | |
705 | /* synchronized under device mutex */ | |
706 | if (waitqueue_active(&cl->ev_wait)) { | |
707 | cl_dbg(dev, cl, "Waking up waiting for event clients!\n"); | |
708 | wake_up_interruptible(&cl->ev_wait); | |
709 | } | |
7ff4bdd4 AU |
710 | /* synchronized under device mutex */ |
711 | if (waitqueue_active(&cl->wait)) { | |
712 | cl_dbg(dev, cl, "Waking up ctrl write clients!\n"); | |
69f1804a | 713 | wake_up(&cl->wait); |
7ff4bdd4 | 714 | } |
a4307fe4 AU |
715 | } |
716 | ||
3c666182 TW |
717 | /** |
718 | * mei_cl_set_disconnected - set disconnected state and clear | |
719 | * associated states and resources | |
720 | * | |
721 | * @cl: host client | |
722 | */ | |
723 | void mei_cl_set_disconnected(struct mei_cl *cl) | |
724 | { | |
725 | struct mei_device *dev = cl->dev; | |
726 | ||
727 | if (cl->state == MEI_FILE_DISCONNECTED || | |
728 | cl->state == MEI_FILE_INITIALIZING) | |
729 | return; | |
730 | ||
731 | cl->state = MEI_FILE_DISCONNECTED; | |
a4307fe4 AU |
732 | mei_io_list_free(&dev->write_list, cl); |
733 | mei_io_list_free(&dev->write_waiting_list, cl); | |
3c666182 TW |
734 | mei_io_list_flush(&dev->ctrl_rd_list, cl); |
735 | mei_io_list_flush(&dev->ctrl_wr_list, cl); | |
a4307fe4 | 736 | mei_cl_wake_all(cl); |
46978ada | 737 | cl->rx_flow_ctrl_creds = 0; |
4034b81b | 738 | cl->tx_flow_ctrl_creds = 0; |
3c666182 | 739 | cl->timer_count = 0; |
d49ed64a | 740 | |
a03d77f6 AU |
741 | if (!cl->me_cl) |
742 | return; | |
743 | ||
744 | if (!WARN_ON(cl->me_cl->connect_count == 0)) | |
745 | cl->me_cl->connect_count--; | |
746 | ||
c241e9b1 | 747 | if (cl->me_cl->connect_count == 0) |
4034b81b | 748 | cl->me_cl->tx_flow_ctrl_creds = 0; |
c241e9b1 | 749 | |
d49ed64a AU |
750 | mei_me_cl_put(cl->me_cl); |
751 | cl->me_cl = NULL; | |
3c666182 TW |
752 | } |
753 | ||
a03d77f6 AU |
754 | static int mei_cl_set_connecting(struct mei_cl *cl, struct mei_me_client *me_cl) |
755 | { | |
1df629ef | 756 | if (!mei_me_cl_get(me_cl)) |
a03d77f6 AU |
757 | return -ENOENT; |
758 | ||
1df629ef AU |
759 | /* only one connection is allowed for fixed address clients */ |
760 | if (me_cl->props.fixed_address) { | |
761 | if (me_cl->connect_count) { | |
762 | mei_me_cl_put(me_cl); | |
763 | return -EBUSY; | |
764 | } | |
765 | } | |
766 | ||
767 | cl->me_cl = me_cl; | |
a03d77f6 AU |
768 | cl->state = MEI_FILE_CONNECTING; |
769 | cl->me_cl->connect_count++; | |
770 | ||
771 | return 0; | |
772 | } | |
773 | ||
3c666182 TW |
774 | /* |
775 | * mei_cl_send_disconnect - send disconnect request | |
776 | * | |
777 | * @cl: host client | |
778 | * @cb: callback block | |
779 | * | |
780 | * Return: 0, OK; otherwise, error. | |
781 | */ | |
782 | static int mei_cl_send_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb) | |
783 | { | |
784 | struct mei_device *dev; | |
785 | int ret; | |
786 | ||
787 | dev = cl->dev; | |
788 | ||
789 | ret = mei_hbm_cl_disconnect_req(dev, cl); | |
790 | cl->status = ret; | |
791 | if (ret) { | |
792 | cl->state = MEI_FILE_DISCONNECT_REPLY; | |
793 | return ret; | |
794 | } | |
795 | ||
796 | list_move_tail(&cb->list, &dev->ctrl_rd_list.list); | |
797 | cl->timer_count = MEI_CONNECT_TIMEOUT; | |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
802 | /** | |
803 | * mei_cl_irq_disconnect - processes close related operation from | |
804 | * interrupt thread context - send disconnect request | |
805 | * | |
806 | * @cl: client | |
807 | * @cb: callback block. | |
808 | * @cmpl_list: complete list. | |
809 | * | |
810 | * Return: 0, OK; otherwise, error. | |
811 | */ | |
812 | int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb, | |
813 | struct mei_cl_cb *cmpl_list) | |
814 | { | |
815 | struct mei_device *dev = cl->dev; | |
816 | u32 msg_slots; | |
817 | int slots; | |
818 | int ret; | |
819 | ||
820 | msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request)); | |
821 | slots = mei_hbuf_empty_slots(dev); | |
822 | ||
823 | if (slots < msg_slots) | |
824 | return -EMSGSIZE; | |
825 | ||
826 | ret = mei_cl_send_disconnect(cl, cb); | |
827 | if (ret) | |
828 | list_move_tail(&cb->list, &cmpl_list->list); | |
829 | ||
830 | return ret; | |
831 | } | |
832 | ||
9ca9050b | 833 | /** |
18901357 AU |
834 | * __mei_cl_disconnect - disconnect host client from the me one |
835 | * internal function runtime pm has to be already acquired | |
9ca9050b | 836 | * |
90e0b5f1 | 837 | * @cl: host client |
9ca9050b | 838 | * |
a8605ea2 | 839 | * Return: 0 on success, <0 on failure. |
9ca9050b | 840 | */ |
18901357 | 841 | static int __mei_cl_disconnect(struct mei_cl *cl) |
9ca9050b | 842 | { |
90e0b5f1 | 843 | struct mei_device *dev; |
9ca9050b | 844 | struct mei_cl_cb *cb; |
fe2f17eb | 845 | int rets; |
9ca9050b | 846 | |
90e0b5f1 TW |
847 | dev = cl->dev; |
848 | ||
3c666182 TW |
849 | cl->state = MEI_FILE_DISCONNECTING; |
850 | ||
bca67d68 TW |
851 | cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT, NULL); |
852 | rets = cb ? 0 : -ENOMEM; | |
853 | if (rets) | |
3c666182 TW |
854 | goto out; |
855 | ||
856 | cl_dbg(dev, cl, "add disconnect cb to control write list\n"); | |
857 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); | |
5a8373fb | 858 | |
6aae48ff | 859 | if (mei_hbuf_acquire(dev)) { |
3c666182 TW |
860 | rets = mei_cl_send_disconnect(cl, cb); |
861 | if (rets) { | |
c0abffbd | 862 | cl_err(dev, cl, "failed to disconnect.\n"); |
3c666182 | 863 | goto out; |
9ca9050b | 864 | } |
9ca9050b | 865 | } |
9ca9050b | 866 | |
3c666182 | 867 | mutex_unlock(&dev->device_lock); |
7ff4bdd4 AU |
868 | wait_event_timeout(cl->wait, |
869 | cl->state == MEI_FILE_DISCONNECT_REPLY || | |
870 | cl->state == MEI_FILE_DISCONNECTED, | |
3c666182 | 871 | mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); |
9ca9050b | 872 | mutex_lock(&dev->device_lock); |
fe2f17eb | 873 | |
3c666182 | 874 | rets = cl->status; |
7ff4bdd4 AU |
875 | if (cl->state != MEI_FILE_DISCONNECT_REPLY && |
876 | cl->state != MEI_FILE_DISCONNECTED) { | |
fe2f17eb AU |
877 | cl_dbg(dev, cl, "timeout on disconnect from FW client.\n"); |
878 | rets = -ETIME; | |
9ca9050b TW |
879 | } |
880 | ||
3c666182 TW |
881 | out: |
882 | /* we disconnect also on error */ | |
883 | mei_cl_set_disconnected(cl); | |
884 | if (!rets) | |
885 | cl_dbg(dev, cl, "successfully disconnected from FW client.\n"); | |
886 | ||
18901357 AU |
887 | mei_io_cb_free(cb); |
888 | return rets; | |
889 | } | |
890 | ||
891 | /** | |
892 | * mei_cl_disconnect - disconnect host client from the me one | |
893 | * | |
894 | * @cl: host client | |
895 | * | |
896 | * Locking: called under "dev->device_lock" lock | |
897 | * | |
898 | * Return: 0 on success, <0 on failure. | |
899 | */ | |
900 | int mei_cl_disconnect(struct mei_cl *cl) | |
901 | { | |
902 | struct mei_device *dev; | |
903 | int rets; | |
904 | ||
905 | if (WARN_ON(!cl || !cl->dev)) | |
906 | return -ENODEV; | |
907 | ||
908 | dev = cl->dev; | |
909 | ||
910 | cl_dbg(dev, cl, "disconnecting"); | |
911 | ||
912 | if (!mei_cl_is_connected(cl)) | |
913 | return 0; | |
914 | ||
915 | if (mei_cl_is_fixed_address(cl)) { | |
916 | mei_cl_set_disconnected(cl); | |
917 | return 0; | |
918 | } | |
919 | ||
920 | rets = pm_runtime_get(dev->dev); | |
921 | if (rets < 0 && rets != -EINPROGRESS) { | |
922 | pm_runtime_put_noidle(dev->dev); | |
923 | cl_err(dev, cl, "rpm: get failed %d\n", rets); | |
924 | return rets; | |
925 | } | |
926 | ||
927 | rets = __mei_cl_disconnect(cl); | |
928 | ||
04bb139a | 929 | cl_dbg(dev, cl, "rpm: autosuspend\n"); |
2bf94cab TW |
930 | pm_runtime_mark_last_busy(dev->dev); |
931 | pm_runtime_put_autosuspend(dev->dev); | |
04bb139a | 932 | |
9ca9050b TW |
933 | return rets; |
934 | } | |
935 | ||
936 | ||
937 | /** | |
90e0b5f1 TW |
938 | * mei_cl_is_other_connecting - checks if other |
939 | * client with the same me client id is connecting | |
9ca9050b | 940 | * |
9ca9050b TW |
941 | * @cl: private data of the file object |
942 | * | |
a8605ea2 | 943 | * Return: true if other client is connected, false - otherwise. |
9ca9050b | 944 | */ |
0c53357c | 945 | static bool mei_cl_is_other_connecting(struct mei_cl *cl) |
9ca9050b | 946 | { |
90e0b5f1 | 947 | struct mei_device *dev; |
0c53357c | 948 | struct mei_cl_cb *cb; |
90e0b5f1 TW |
949 | |
950 | dev = cl->dev; | |
951 | ||
0c53357c TW |
952 | list_for_each_entry(cb, &dev->ctrl_rd_list.list, list) { |
953 | if (cb->fop_type == MEI_FOP_CONNECT && | |
d49ed64a | 954 | mei_cl_me_id(cl) == mei_cl_me_id(cb->cl)) |
90e0b5f1 | 955 | return true; |
9ca9050b | 956 | } |
90e0b5f1 TW |
957 | |
958 | return false; | |
9ca9050b TW |
959 | } |
960 | ||
0c53357c TW |
961 | /** |
962 | * mei_cl_send_connect - send connect request | |
963 | * | |
964 | * @cl: host client | |
965 | * @cb: callback block | |
966 | * | |
967 | * Return: 0, OK; otherwise, error. | |
968 | */ | |
969 | static int mei_cl_send_connect(struct mei_cl *cl, struct mei_cl_cb *cb) | |
970 | { | |
971 | struct mei_device *dev; | |
972 | int ret; | |
973 | ||
974 | dev = cl->dev; | |
975 | ||
976 | ret = mei_hbm_cl_connect_req(dev, cl); | |
977 | cl->status = ret; | |
978 | if (ret) { | |
979 | cl->state = MEI_FILE_DISCONNECT_REPLY; | |
980 | return ret; | |
981 | } | |
982 | ||
983 | list_move_tail(&cb->list, &dev->ctrl_rd_list.list); | |
984 | cl->timer_count = MEI_CONNECT_TIMEOUT; | |
985 | return 0; | |
986 | } | |
987 | ||
988 | /** | |
989 | * mei_cl_irq_connect - send connect request in irq_thread context | |
990 | * | |
991 | * @cl: host client | |
992 | * @cb: callback block | |
993 | * @cmpl_list: complete list | |
994 | * | |
995 | * Return: 0, OK; otherwise, error. | |
996 | */ | |
997 | int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb, | |
998 | struct mei_cl_cb *cmpl_list) | |
999 | { | |
1000 | struct mei_device *dev = cl->dev; | |
1001 | u32 msg_slots; | |
1002 | int slots; | |
1003 | int rets; | |
1004 | ||
1005 | msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request)); | |
1006 | slots = mei_hbuf_empty_slots(dev); | |
1007 | ||
1008 | if (mei_cl_is_other_connecting(cl)) | |
1009 | return 0; | |
1010 | ||
1011 | if (slots < msg_slots) | |
1012 | return -EMSGSIZE; | |
1013 | ||
1014 | rets = mei_cl_send_connect(cl, cb); | |
1015 | if (rets) | |
1016 | list_move_tail(&cb->list, &cmpl_list->list); | |
1017 | ||
1018 | return rets; | |
1019 | } | |
1020 | ||
9f81abda | 1021 | /** |
83ce0741 | 1022 | * mei_cl_connect - connect host client to the me one |
9f81abda TW |
1023 | * |
1024 | * @cl: host client | |
d49ed64a | 1025 | * @me_cl: me client |
a8605ea2 | 1026 | * @file: pointer to file structure |
9f81abda TW |
1027 | * |
1028 | * Locking: called under "dev->device_lock" lock | |
1029 | * | |
a8605ea2 | 1030 | * Return: 0 on success, <0 on failure. |
9f81abda | 1031 | */ |
d49ed64a | 1032 | int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl, |
f23e2cc4 | 1033 | const struct file *file) |
9f81abda TW |
1034 | { |
1035 | struct mei_device *dev; | |
1036 | struct mei_cl_cb *cb; | |
9f81abda TW |
1037 | int rets; |
1038 | ||
1df629ef | 1039 | if (WARN_ON(!cl || !cl->dev || !me_cl)) |
9f81abda TW |
1040 | return -ENODEV; |
1041 | ||
1042 | dev = cl->dev; | |
1043 | ||
1df629ef AU |
1044 | rets = mei_cl_set_connecting(cl, me_cl); |
1045 | if (rets) | |
1046 | return rets; | |
1047 | ||
1048 | if (mei_cl_is_fixed_address(cl)) { | |
1049 | cl->state = MEI_FILE_CONNECTED; | |
1050 | return 0; | |
1051 | } | |
1052 | ||
2bf94cab | 1053 | rets = pm_runtime_get(dev->dev); |
04bb139a | 1054 | if (rets < 0 && rets != -EINPROGRESS) { |
2bf94cab | 1055 | pm_runtime_put_noidle(dev->dev); |
04bb139a | 1056 | cl_err(dev, cl, "rpm: get failed %d\n", rets); |
1df629ef | 1057 | goto nortpm; |
04bb139a TW |
1058 | } |
1059 | ||
bca67d68 TW |
1060 | cb = mei_io_cb_init(cl, MEI_FOP_CONNECT, file); |
1061 | rets = cb ? 0 : -ENOMEM; | |
1062 | if (rets) | |
9f81abda | 1063 | goto out; |
9f81abda | 1064 | |
0c53357c TW |
1065 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); |
1066 | ||
6aae48ff TW |
1067 | /* run hbuf acquire last so we don't have to undo */ |
1068 | if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) { | |
0c53357c TW |
1069 | rets = mei_cl_send_connect(cl, cb); |
1070 | if (rets) | |
9f81abda | 1071 | goto out; |
9f81abda TW |
1072 | } |
1073 | ||
1074 | mutex_unlock(&dev->device_lock); | |
12f45ed4 | 1075 | wait_event_timeout(cl->wait, |
285e2996 | 1076 | (cl->state == MEI_FILE_CONNECTED || |
7ff4bdd4 | 1077 | cl->state == MEI_FILE_DISCONNECTED || |
18901357 | 1078 | cl->state == MEI_FILE_DISCONNECT_REQUIRED || |
3c666182 | 1079 | cl->state == MEI_FILE_DISCONNECT_REPLY), |
285e2996 | 1080 | mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); |
9f81abda TW |
1081 | mutex_lock(&dev->device_lock); |
1082 | ||
f3de9b63 | 1083 | if (!mei_cl_is_connected(cl)) { |
18901357 AU |
1084 | if (cl->state == MEI_FILE_DISCONNECT_REQUIRED) { |
1085 | mei_io_list_flush(&dev->ctrl_rd_list, cl); | |
1086 | mei_io_list_flush(&dev->ctrl_wr_list, cl); | |
1087 | /* ignore disconnect return valuue; | |
1088 | * in case of failure reset will be invoked | |
1089 | */ | |
1090 | __mei_cl_disconnect(cl); | |
1091 | rets = -EFAULT; | |
1092 | goto out; | |
1093 | } | |
1094 | ||
0c53357c | 1095 | /* timeout or something went really wrong */ |
285e2996 AU |
1096 | if (!cl->status) |
1097 | cl->status = -EFAULT; | |
9f81abda TW |
1098 | } |
1099 | ||
1100 | rets = cl->status; | |
9f81abda | 1101 | out: |
04bb139a | 1102 | cl_dbg(dev, cl, "rpm: autosuspend\n"); |
2bf94cab TW |
1103 | pm_runtime_mark_last_busy(dev->dev); |
1104 | pm_runtime_put_autosuspend(dev->dev); | |
04bb139a | 1105 | |
9f81abda | 1106 | mei_io_cb_free(cb); |
0c53357c | 1107 | |
1df629ef | 1108 | nortpm: |
0c53357c TW |
1109 | if (!mei_cl_is_connected(cl)) |
1110 | mei_cl_set_disconnected(cl); | |
1111 | ||
9f81abda TW |
1112 | return rets; |
1113 | } | |
1114 | ||
03b8d341 TW |
1115 | /** |
1116 | * mei_cl_alloc_linked - allocate and link host client | |
1117 | * | |
1118 | * @dev: the device structure | |
03b8d341 TW |
1119 | * |
1120 | * Return: cl on success ERR_PTR on failure | |
1121 | */ | |
7851e008 | 1122 | struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev) |
03b8d341 TW |
1123 | { |
1124 | struct mei_cl *cl; | |
1125 | int ret; | |
1126 | ||
1127 | cl = mei_cl_allocate(dev); | |
1128 | if (!cl) { | |
1129 | ret = -ENOMEM; | |
1130 | goto err; | |
1131 | } | |
1132 | ||
7851e008 | 1133 | ret = mei_cl_link(cl); |
03b8d341 TW |
1134 | if (ret) |
1135 | goto err; | |
1136 | ||
1137 | return cl; | |
1138 | err: | |
1139 | kfree(cl); | |
1140 | return ERR_PTR(ret); | |
1141 | } | |
1142 | ||
9ca9050b | 1143 | /** |
4034b81b | 1144 | * mei_cl_tx_flow_ctrl_creds - checks flow_control credits for cl. |
9ca9050b | 1145 | * |
06ee536b | 1146 | * @cl: host client |
9ca9050b | 1147 | * |
4034b81b | 1148 | * Return: 1 if tx_flow_ctrl_creds >0, 0 - otherwise. |
9ca9050b | 1149 | */ |
4034b81b | 1150 | static int mei_cl_tx_flow_ctrl_creds(struct mei_cl *cl) |
9ca9050b | 1151 | { |
d49ed64a | 1152 | if (WARN_ON(!cl || !cl->me_cl)) |
90e0b5f1 TW |
1153 | return -EINVAL; |
1154 | ||
4034b81b | 1155 | if (cl->tx_flow_ctrl_creds > 0) |
9ca9050b TW |
1156 | return 1; |
1157 | ||
a808c80c | 1158 | if (mei_cl_is_fixed_address(cl)) |
1df629ef | 1159 | return 1; |
1df629ef | 1160 | |
d49ed64a | 1161 | if (mei_cl_is_single_recv_buf(cl)) { |
4034b81b | 1162 | if (cl->me_cl->tx_flow_ctrl_creds > 0) |
d49ed64a | 1163 | return 1; |
9ca9050b | 1164 | } |
d49ed64a | 1165 | return 0; |
9ca9050b TW |
1166 | } |
1167 | ||
1168 | /** | |
4034b81b TW |
1169 | * mei_cl_tx_flow_ctrl_creds_reduce - reduces transmit flow control credits |
1170 | * for a client | |
9ca9050b | 1171 | * |
4034b81b | 1172 | * @cl: host client |
393b148f | 1173 | * |
a8605ea2 | 1174 | * Return: |
9ca9050b | 1175 | * 0 on success |
9ca9050b TW |
1176 | * -EINVAL when ctrl credits are <= 0 |
1177 | */ | |
4034b81b | 1178 | static int mei_cl_tx_flow_ctrl_creds_reduce(struct mei_cl *cl) |
9ca9050b | 1179 | { |
d49ed64a | 1180 | if (WARN_ON(!cl || !cl->me_cl)) |
90e0b5f1 TW |
1181 | return -EINVAL; |
1182 | ||
1df629ef AU |
1183 | if (mei_cl_is_fixed_address(cl)) |
1184 | return 0; | |
1185 | ||
d49ed64a | 1186 | if (mei_cl_is_single_recv_buf(cl)) { |
4034b81b | 1187 | if (WARN_ON(cl->me_cl->tx_flow_ctrl_creds <= 0)) |
d49ed64a | 1188 | return -EINVAL; |
4034b81b | 1189 | cl->me_cl->tx_flow_ctrl_creds--; |
12d00665 | 1190 | } else { |
4034b81b | 1191 | if (WARN_ON(cl->tx_flow_ctrl_creds <= 0)) |
d49ed64a | 1192 | return -EINVAL; |
4034b81b | 1193 | cl->tx_flow_ctrl_creds--; |
9ca9050b | 1194 | } |
d49ed64a | 1195 | return 0; |
9ca9050b TW |
1196 | } |
1197 | ||
51678ccb TW |
1198 | /** |
1199 | * mei_cl_notify_fop2req - convert fop to proper request | |
1200 | * | |
1201 | * @fop: client notification start response command | |
1202 | * | |
1203 | * Return: MEI_HBM_NOTIFICATION_START/STOP | |
1204 | */ | |
1205 | u8 mei_cl_notify_fop2req(enum mei_cb_file_ops fop) | |
1206 | { | |
1207 | if (fop == MEI_FOP_NOTIFY_START) | |
1208 | return MEI_HBM_NOTIFICATION_START; | |
1209 | else | |
1210 | return MEI_HBM_NOTIFICATION_STOP; | |
1211 | } | |
1212 | ||
1213 | /** | |
1214 | * mei_cl_notify_req2fop - convert notification request top file operation type | |
1215 | * | |
1216 | * @req: hbm notification request type | |
1217 | * | |
1218 | * Return: MEI_FOP_NOTIFY_START/STOP | |
1219 | */ | |
1220 | enum mei_cb_file_ops mei_cl_notify_req2fop(u8 req) | |
1221 | { | |
1222 | if (req == MEI_HBM_NOTIFICATION_START) | |
1223 | return MEI_FOP_NOTIFY_START; | |
1224 | else | |
1225 | return MEI_FOP_NOTIFY_STOP; | |
1226 | } | |
1227 | ||
1228 | /** | |
1229 | * mei_cl_irq_notify - send notification request in irq_thread context | |
1230 | * | |
1231 | * @cl: client | |
1232 | * @cb: callback block. | |
1233 | * @cmpl_list: complete list. | |
1234 | * | |
1235 | * Return: 0 on such and error otherwise. | |
1236 | */ | |
1237 | int mei_cl_irq_notify(struct mei_cl *cl, struct mei_cl_cb *cb, | |
1238 | struct mei_cl_cb *cmpl_list) | |
1239 | { | |
1240 | struct mei_device *dev = cl->dev; | |
1241 | u32 msg_slots; | |
1242 | int slots; | |
1243 | int ret; | |
1244 | bool request; | |
1245 | ||
1246 | msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request)); | |
1247 | slots = mei_hbuf_empty_slots(dev); | |
1248 | ||
1249 | if (slots < msg_slots) | |
1250 | return -EMSGSIZE; | |
1251 | ||
1252 | request = mei_cl_notify_fop2req(cb->fop_type); | |
1253 | ret = mei_hbm_cl_notify_req(dev, cl, request); | |
1254 | if (ret) { | |
1255 | cl->status = ret; | |
1256 | list_move_tail(&cb->list, &cmpl_list->list); | |
1257 | return ret; | |
1258 | } | |
1259 | ||
1260 | list_move_tail(&cb->list, &dev->ctrl_rd_list.list); | |
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | /** | |
1265 | * mei_cl_notify_request - send notification stop/start request | |
1266 | * | |
1267 | * @cl: host client | |
1268 | * @file: associate request with file | |
1269 | * @request: 1 for start or 0 for stop | |
1270 | * | |
1271 | * Locking: called under "dev->device_lock" lock | |
1272 | * | |
1273 | * Return: 0 on such and error otherwise. | |
1274 | */ | |
f23e2cc4 TW |
1275 | int mei_cl_notify_request(struct mei_cl *cl, |
1276 | const struct file *file, u8 request) | |
51678ccb TW |
1277 | { |
1278 | struct mei_device *dev; | |
1279 | struct mei_cl_cb *cb; | |
1280 | enum mei_cb_file_ops fop_type; | |
1281 | int rets; | |
1282 | ||
1283 | if (WARN_ON(!cl || !cl->dev)) | |
1284 | return -ENODEV; | |
1285 | ||
1286 | dev = cl->dev; | |
1287 | ||
1288 | if (!dev->hbm_f_ev_supported) { | |
1289 | cl_dbg(dev, cl, "notifications not supported\n"); | |
1290 | return -EOPNOTSUPP; | |
1291 | } | |
1292 | ||
1293 | rets = pm_runtime_get(dev->dev); | |
1294 | if (rets < 0 && rets != -EINPROGRESS) { | |
1295 | pm_runtime_put_noidle(dev->dev); | |
1296 | cl_err(dev, cl, "rpm: get failed %d\n", rets); | |
1297 | return rets; | |
1298 | } | |
1299 | ||
1300 | fop_type = mei_cl_notify_req2fop(request); | |
1301 | cb = mei_io_cb_init(cl, fop_type, file); | |
1302 | if (!cb) { | |
1303 | rets = -ENOMEM; | |
1304 | goto out; | |
1305 | } | |
1306 | ||
1307 | if (mei_hbuf_acquire(dev)) { | |
1308 | if (mei_hbm_cl_notify_req(dev, cl, request)) { | |
1309 | rets = -ENODEV; | |
1310 | goto out; | |
1311 | } | |
1312 | list_add_tail(&cb->list, &dev->ctrl_rd_list.list); | |
1313 | } else { | |
1314 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); | |
1315 | } | |
1316 | ||
1317 | mutex_unlock(&dev->device_lock); | |
7ff4bdd4 AU |
1318 | wait_event_timeout(cl->wait, |
1319 | cl->notify_en == request || !mei_cl_is_connected(cl), | |
1320 | mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); | |
51678ccb TW |
1321 | mutex_lock(&dev->device_lock); |
1322 | ||
4a8eaa96 AU |
1323 | if (cl->notify_en != request && !cl->status) |
1324 | cl->status = -EFAULT; | |
51678ccb TW |
1325 | |
1326 | rets = cl->status; | |
1327 | ||
1328 | out: | |
1329 | cl_dbg(dev, cl, "rpm: autosuspend\n"); | |
1330 | pm_runtime_mark_last_busy(dev->dev); | |
1331 | pm_runtime_put_autosuspend(dev->dev); | |
1332 | ||
1333 | mei_io_cb_free(cb); | |
1334 | return rets; | |
1335 | } | |
1336 | ||
237092bf TW |
1337 | /** |
1338 | * mei_cl_notify - raise notification | |
1339 | * | |
1340 | * @cl: host client | |
1341 | * | |
1342 | * Locking: called under "dev->device_lock" lock | |
1343 | */ | |
1344 | void mei_cl_notify(struct mei_cl *cl) | |
1345 | { | |
1346 | struct mei_device *dev; | |
1347 | ||
1348 | if (!cl || !cl->dev) | |
1349 | return; | |
1350 | ||
1351 | dev = cl->dev; | |
1352 | ||
1353 | if (!cl->notify_en) | |
1354 | return; | |
1355 | ||
1356 | cl_dbg(dev, cl, "notify event"); | |
1357 | cl->notify_ev = true; | |
850f8940 TW |
1358 | if (!mei_cl_bus_notify_event(cl)) |
1359 | wake_up_interruptible(&cl->ev_wait); | |
237092bf TW |
1360 | |
1361 | if (cl->ev_async) | |
1362 | kill_fasync(&cl->ev_async, SIGIO, POLL_PRI); | |
bb2ef9c3 | 1363 | |
237092bf TW |
1364 | } |
1365 | ||
b38a362f TW |
1366 | /** |
1367 | * mei_cl_notify_get - get or wait for notification event | |
1368 | * | |
1369 | * @cl: host client | |
1370 | * @block: this request is blocking | |
1371 | * @notify_ev: true if notification event was received | |
1372 | * | |
1373 | * Locking: called under "dev->device_lock" lock | |
1374 | * | |
1375 | * Return: 0 on such and error otherwise. | |
1376 | */ | |
1377 | int mei_cl_notify_get(struct mei_cl *cl, bool block, bool *notify_ev) | |
1378 | { | |
1379 | struct mei_device *dev; | |
1380 | int rets; | |
1381 | ||
1382 | *notify_ev = false; | |
1383 | ||
1384 | if (WARN_ON(!cl || !cl->dev)) | |
1385 | return -ENODEV; | |
1386 | ||
1387 | dev = cl->dev; | |
1388 | ||
1389 | if (!mei_cl_is_connected(cl)) | |
1390 | return -ENODEV; | |
1391 | ||
1392 | if (cl->notify_ev) | |
1393 | goto out; | |
1394 | ||
1395 | if (!block) | |
1396 | return -EAGAIN; | |
1397 | ||
1398 | mutex_unlock(&dev->device_lock); | |
1399 | rets = wait_event_interruptible(cl->ev_wait, cl->notify_ev); | |
1400 | mutex_lock(&dev->device_lock); | |
1401 | ||
1402 | if (rets < 0) | |
1403 | return rets; | |
1404 | ||
1405 | out: | |
1406 | *notify_ev = cl->notify_ev; | |
1407 | cl->notify_ev = false; | |
1408 | return 0; | |
1409 | } | |
1410 | ||
ab841160 | 1411 | /** |
393b148f | 1412 | * mei_cl_read_start - the start read client message function. |
ab841160 | 1413 | * |
90e0b5f1 | 1414 | * @cl: host client |
ce23139c | 1415 | * @length: number of bytes to read |
bca67d68 | 1416 | * @fp: pointer to file structure |
ab841160 | 1417 | * |
a8605ea2 | 1418 | * Return: 0 on success, <0 on failure. |
ab841160 | 1419 | */ |
f23e2cc4 | 1420 | int mei_cl_read_start(struct mei_cl *cl, size_t length, const struct file *fp) |
ab841160 | 1421 | { |
90e0b5f1 | 1422 | struct mei_device *dev; |
ab841160 | 1423 | struct mei_cl_cb *cb; |
664df38b | 1424 | int rets; |
ab841160 | 1425 | |
90e0b5f1 TW |
1426 | if (WARN_ON(!cl || !cl->dev)) |
1427 | return -ENODEV; | |
1428 | ||
1429 | dev = cl->dev; | |
1430 | ||
b950ac1d | 1431 | if (!mei_cl_is_connected(cl)) |
ab841160 OW |
1432 | return -ENODEV; |
1433 | ||
d49ed64a AU |
1434 | if (!mei_me_cl_is_active(cl->me_cl)) { |
1435 | cl_err(dev, cl, "no such me client\n"); | |
7ca96aa2 | 1436 | return -ENOTTY; |
664df38b | 1437 | } |
1df629ef | 1438 | |
e51dfa5a AU |
1439 | if (mei_cl_is_fixed_address(cl)) |
1440 | return 0; | |
1441 | ||
46978ada AU |
1442 | /* HW currently supports only one pending read */ |
1443 | if (cl->rx_flow_ctrl_creds) | |
1444 | return -EBUSY; | |
1445 | ||
79563db9 | 1446 | /* always allocate at least client max message */ |
d49ed64a | 1447 | length = max_t(size_t, length, mei_cl_mtu(cl)); |
1df629ef AU |
1448 | cb = mei_cl_alloc_cb(cl, length, MEI_FOP_READ, fp); |
1449 | if (!cb) | |
1450 | return -ENOMEM; | |
1451 | ||
46978ada AU |
1452 | list_add_tail(&cb->list, &dev->ctrl_wr_list.list); |
1453 | ||
2bf94cab | 1454 | rets = pm_runtime_get(dev->dev); |
04bb139a | 1455 | if (rets < 0 && rets != -EINPROGRESS) { |
2bf94cab | 1456 | pm_runtime_put_noidle(dev->dev); |
04bb139a | 1457 | cl_err(dev, cl, "rpm: get failed %d\n", rets); |
1df629ef | 1458 | goto nortpm; |
04bb139a TW |
1459 | } |
1460 | ||
46978ada | 1461 | rets = 0; |
6aae48ff | 1462 | if (mei_hbuf_acquire(dev)) { |
86113500 AU |
1463 | rets = mei_hbm_cl_flow_control_req(dev, cl); |
1464 | if (rets < 0) | |
04bb139a | 1465 | goto out; |
04bb139a | 1466 | |
46978ada | 1467 | list_move_tail(&cb->list, &cl->rd_pending); |
ab841160 | 1468 | } |
46978ada | 1469 | cl->rx_flow_ctrl_creds++; |
accb884b | 1470 | |
04bb139a TW |
1471 | out: |
1472 | cl_dbg(dev, cl, "rpm: autosuspend\n"); | |
2bf94cab TW |
1473 | pm_runtime_mark_last_busy(dev->dev); |
1474 | pm_runtime_put_autosuspend(dev->dev); | |
1df629ef | 1475 | nortpm: |
04bb139a TW |
1476 | if (rets) |
1477 | mei_io_cb_free(cb); | |
1478 | ||
ab841160 OW |
1479 | return rets; |
1480 | } | |
1481 | ||
21767546 | 1482 | /** |
9d098192 | 1483 | * mei_cl_irq_write - write a message to device |
21767546 TW |
1484 | * from the interrupt thread context |
1485 | * | |
1486 | * @cl: client | |
1487 | * @cb: callback block. | |
21767546 TW |
1488 | * @cmpl_list: complete list. |
1489 | * | |
a8605ea2 | 1490 | * Return: 0, OK; otherwise error. |
21767546 | 1491 | */ |
9d098192 TW |
1492 | int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb, |
1493 | struct mei_cl_cb *cmpl_list) | |
21767546 | 1494 | { |
136698e5 TW |
1495 | struct mei_device *dev; |
1496 | struct mei_msg_data *buf; | |
21767546 | 1497 | struct mei_msg_hdr mei_hdr; |
136698e5 TW |
1498 | size_t len; |
1499 | u32 msg_slots; | |
9d098192 | 1500 | int slots; |
2ebf8c94 | 1501 | int rets; |
b8b73035 | 1502 | bool first_chunk; |
21767546 | 1503 | |
136698e5 TW |
1504 | if (WARN_ON(!cl || !cl->dev)) |
1505 | return -ENODEV; | |
1506 | ||
1507 | dev = cl->dev; | |
1508 | ||
5db7514d | 1509 | buf = &cb->buf; |
136698e5 | 1510 | |
b8b73035 AU |
1511 | first_chunk = cb->buf_idx == 0; |
1512 | ||
4034b81b | 1513 | rets = first_chunk ? mei_cl_tx_flow_ctrl_creds(cl) : 1; |
136698e5 TW |
1514 | if (rets < 0) |
1515 | return rets; | |
1516 | ||
1517 | if (rets == 0) { | |
04bb139a | 1518 | cl_dbg(dev, cl, "No flow control credentials: not sending.\n"); |
136698e5 TW |
1519 | return 0; |
1520 | } | |
1521 | ||
9d098192 | 1522 | slots = mei_hbuf_empty_slots(dev); |
136698e5 TW |
1523 | len = buf->size - cb->buf_idx; |
1524 | msg_slots = mei_data2slots(len); | |
1525 | ||
1df629ef | 1526 | mei_hdr.host_addr = mei_cl_host_addr(cl); |
d49ed64a | 1527 | mei_hdr.me_addr = mei_cl_me_id(cl); |
21767546 | 1528 | mei_hdr.reserved = 0; |
479327fc | 1529 | mei_hdr.internal = cb->internal; |
21767546 | 1530 | |
9d098192 | 1531 | if (slots >= msg_slots) { |
21767546 TW |
1532 | mei_hdr.length = len; |
1533 | mei_hdr.msg_complete = 1; | |
1534 | /* Split the message only if we can write the whole host buffer */ | |
9d098192 TW |
1535 | } else if (slots == dev->hbuf_depth) { |
1536 | msg_slots = slots; | |
1537 | len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr); | |
21767546 TW |
1538 | mei_hdr.length = len; |
1539 | mei_hdr.msg_complete = 0; | |
1540 | } else { | |
1541 | /* wait for next time the host buffer is empty */ | |
1542 | return 0; | |
1543 | } | |
1544 | ||
35bf7692 | 1545 | cl_dbg(dev, cl, "buf: size = %zu idx = %zu\n", |
5db7514d | 1546 | cb->buf.size, cb->buf_idx); |
21767546 | 1547 | |
136698e5 | 1548 | rets = mei_write_message(dev, &mei_hdr, buf->data + cb->buf_idx); |
2ebf8c94 TW |
1549 | if (rets) { |
1550 | cl->status = rets; | |
21767546 | 1551 | list_move_tail(&cb->list, &cmpl_list->list); |
2ebf8c94 | 1552 | return rets; |
21767546 TW |
1553 | } |
1554 | ||
1555 | cl->status = 0; | |
4dfaa9f7 | 1556 | cl->writing_state = MEI_WRITING; |
21767546 | 1557 | cb->buf_idx += mei_hdr.length; |
8660172e | 1558 | cb->completed = mei_hdr.msg_complete == 1; |
4dfaa9f7 | 1559 | |
b8b73035 | 1560 | if (first_chunk) { |
4034b81b | 1561 | if (mei_cl_tx_flow_ctrl_creds_reduce(cl)) |
2ebf8c94 | 1562 | return -EIO; |
21767546 TW |
1563 | } |
1564 | ||
b8b73035 AU |
1565 | if (mei_hdr.msg_complete) |
1566 | list_move_tail(&cb->list, &dev->write_waiting_list.list); | |
1567 | ||
21767546 TW |
1568 | return 0; |
1569 | } | |
1570 | ||
4234a6de TW |
1571 | /** |
1572 | * mei_cl_write - submit a write cb to mei device | |
a8605ea2 | 1573 | * assumes device_lock is locked |
4234a6de TW |
1574 | * |
1575 | * @cl: host client | |
a8605ea2 | 1576 | * @cb: write callback with filled data |
ce23139c | 1577 | * @blocking: block until completed |
4234a6de | 1578 | * |
a8605ea2 | 1579 | * Return: number of bytes sent on success, <0 on failure. |
4234a6de TW |
1580 | */ |
1581 | int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking) | |
1582 | { | |
1583 | struct mei_device *dev; | |
1584 | struct mei_msg_data *buf; | |
1585 | struct mei_msg_hdr mei_hdr; | |
23253c31 | 1586 | int size; |
4234a6de TW |
1587 | int rets; |
1588 | ||
1589 | ||
1590 | if (WARN_ON(!cl || !cl->dev)) | |
1591 | return -ENODEV; | |
1592 | ||
1593 | if (WARN_ON(!cb)) | |
1594 | return -EINVAL; | |
1595 | ||
1596 | dev = cl->dev; | |
1597 | ||
5db7514d | 1598 | buf = &cb->buf; |
23253c31 | 1599 | size = buf->size; |
4234a6de | 1600 | |
23253c31 | 1601 | cl_dbg(dev, cl, "size=%d\n", size); |
4234a6de | 1602 | |
2bf94cab | 1603 | rets = pm_runtime_get(dev->dev); |
04bb139a | 1604 | if (rets < 0 && rets != -EINPROGRESS) { |
2bf94cab | 1605 | pm_runtime_put_noidle(dev->dev); |
04bb139a | 1606 | cl_err(dev, cl, "rpm: get failed %d\n", rets); |
6cbb097f | 1607 | goto free; |
04bb139a | 1608 | } |
4234a6de | 1609 | |
6aae48ff TW |
1610 | cb->buf_idx = 0; |
1611 | cl->writing_state = MEI_IDLE; | |
1612 | ||
1df629ef | 1613 | mei_hdr.host_addr = mei_cl_host_addr(cl); |
d49ed64a | 1614 | mei_hdr.me_addr = mei_cl_me_id(cl); |
6aae48ff TW |
1615 | mei_hdr.reserved = 0; |
1616 | mei_hdr.msg_complete = 0; | |
1617 | mei_hdr.internal = cb->internal; | |
4234a6de | 1618 | |
4034b81b | 1619 | rets = mei_cl_tx_flow_ctrl_creds(cl); |
4234a6de TW |
1620 | if (rets < 0) |
1621 | goto err; | |
1622 | ||
6aae48ff TW |
1623 | if (rets == 0) { |
1624 | cl_dbg(dev, cl, "No flow control credentials: not sending.\n"); | |
23253c31 | 1625 | rets = size; |
6aae48ff TW |
1626 | goto out; |
1627 | } | |
1628 | if (!mei_hbuf_acquire(dev)) { | |
1629 | cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n"); | |
23253c31 | 1630 | rets = size; |
4234a6de TW |
1631 | goto out; |
1632 | } | |
4234a6de TW |
1633 | |
1634 | /* Check for a maximum length */ | |
23253c31 | 1635 | if (size > mei_hbuf_max_len(dev)) { |
4234a6de TW |
1636 | mei_hdr.length = mei_hbuf_max_len(dev); |
1637 | mei_hdr.msg_complete = 0; | |
1638 | } else { | |
23253c31 | 1639 | mei_hdr.length = size; |
4234a6de TW |
1640 | mei_hdr.msg_complete = 1; |
1641 | } | |
1642 | ||
2ebf8c94 TW |
1643 | rets = mei_write_message(dev, &mei_hdr, buf->data); |
1644 | if (rets) | |
4234a6de | 1645 | goto err; |
4234a6de | 1646 | |
4034b81b | 1647 | rets = mei_cl_tx_flow_ctrl_creds_reduce(cl); |
b8b73035 AU |
1648 | if (rets) |
1649 | goto err; | |
1650 | ||
4234a6de TW |
1651 | cl->writing_state = MEI_WRITING; |
1652 | cb->buf_idx = mei_hdr.length; | |
8660172e | 1653 | cb->completed = mei_hdr.msg_complete == 1; |
4234a6de | 1654 | |
4234a6de | 1655 | out: |
b8b73035 | 1656 | if (mei_hdr.msg_complete) |
4234a6de | 1657 | list_add_tail(&cb->list, &dev->write_waiting_list.list); |
b8b73035 | 1658 | else |
4234a6de | 1659 | list_add_tail(&cb->list, &dev->write_list.list); |
4234a6de | 1660 | |
23253c31 | 1661 | cb = NULL; |
4234a6de TW |
1662 | if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) { |
1663 | ||
1664 | mutex_unlock(&dev->device_lock); | |
7ca96aa2 | 1665 | rets = wait_event_interruptible(cl->tx_wait, |
0faf6a3b AU |
1666 | cl->writing_state == MEI_WRITE_COMPLETE || |
1667 | (!mei_cl_is_connected(cl))); | |
4234a6de | 1668 | mutex_lock(&dev->device_lock); |
7ca96aa2 AU |
1669 | /* wait_event_interruptible returns -ERESTARTSYS */ |
1670 | if (rets) { | |
1671 | if (signal_pending(current)) | |
1672 | rets = -EINTR; | |
1673 | goto err; | |
1674 | } | |
0faf6a3b AU |
1675 | if (cl->writing_state != MEI_WRITE_COMPLETE) { |
1676 | rets = -EFAULT; | |
1677 | goto err; | |
1678 | } | |
4234a6de | 1679 | } |
7ca96aa2 | 1680 | |
23253c31 | 1681 | rets = size; |
4234a6de | 1682 | err: |
04bb139a | 1683 | cl_dbg(dev, cl, "rpm: autosuspend\n"); |
2bf94cab TW |
1684 | pm_runtime_mark_last_busy(dev->dev); |
1685 | pm_runtime_put_autosuspend(dev->dev); | |
6cbb097f AU |
1686 | free: |
1687 | mei_io_cb_free(cb); | |
04bb139a | 1688 | |
4234a6de TW |
1689 | return rets; |
1690 | } | |
1691 | ||
1692 | ||
db086fa9 TW |
1693 | /** |
1694 | * mei_cl_complete - processes completed operation for a client | |
1695 | * | |
1696 | * @cl: private data of the file object. | |
1697 | * @cb: callback block. | |
1698 | */ | |
1699 | void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb) | |
1700 | { | |
a1809d38 AU |
1701 | struct mei_device *dev = cl->dev; |
1702 | ||
3c666182 TW |
1703 | switch (cb->fop_type) { |
1704 | case MEI_FOP_WRITE: | |
db086fa9 | 1705 | mei_io_cb_free(cb); |
db086fa9 | 1706 | cl->writing_state = MEI_WRITE_COMPLETE; |
a1809d38 | 1707 | if (waitqueue_active(&cl->tx_wait)) { |
db086fa9 | 1708 | wake_up_interruptible(&cl->tx_wait); |
a1809d38 AU |
1709 | } else { |
1710 | pm_runtime_mark_last_busy(dev->dev); | |
1711 | pm_request_autosuspend(dev->dev); | |
1712 | } | |
3c666182 | 1713 | break; |
db086fa9 | 1714 | |
3c666182 | 1715 | case MEI_FOP_READ: |
a9bed610 | 1716 | list_add_tail(&cb->list, &cl->rd_completed); |
46978ada AU |
1717 | if (!mei_cl_is_fixed_address(cl) && |
1718 | !WARN_ON(!cl->rx_flow_ctrl_creds)) | |
1719 | cl->rx_flow_ctrl_creds--; | |
a1f9ae2b TW |
1720 | if (!mei_cl_bus_rx_event(cl)) |
1721 | wake_up_interruptible(&cl->rx_wait); | |
3c666182 TW |
1722 | break; |
1723 | ||
1724 | case MEI_FOP_CONNECT: | |
1725 | case MEI_FOP_DISCONNECT: | |
51678ccb TW |
1726 | case MEI_FOP_NOTIFY_STOP: |
1727 | case MEI_FOP_NOTIFY_START: | |
3c666182 TW |
1728 | if (waitqueue_active(&cl->wait)) |
1729 | wake_up(&cl->wait); | |
db086fa9 | 1730 | |
6a8d648c AU |
1731 | break; |
1732 | case MEI_FOP_DISCONNECT_RSP: | |
1733 | mei_io_cb_free(cb); | |
1734 | mei_cl_set_disconnected(cl); | |
3c666182 TW |
1735 | break; |
1736 | default: | |
1737 | BUG_ON(0); | |
db086fa9 TW |
1738 | } |
1739 | } | |
1740 | ||
4234a6de | 1741 | |
074b4c01 TW |
1742 | /** |
1743 | * mei_cl_all_disconnect - disconnect forcefully all connected clients | |
1744 | * | |
a8605ea2 | 1745 | * @dev: mei device |
074b4c01 | 1746 | */ |
074b4c01 TW |
1747 | void mei_cl_all_disconnect(struct mei_device *dev) |
1748 | { | |
31f88f57 | 1749 | struct mei_cl *cl; |
074b4c01 | 1750 | |
3c666182 TW |
1751 | list_for_each_entry(cl, &dev->file_list, link) |
1752 | mei_cl_set_disconnected(cl); | |
074b4c01 | 1753 | } |