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Commit | Line | Data |
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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 | */ | |
3030dc05 TW |
361 | static struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, |
362 | enum mei_cb_file_ops type, | |
363 | const struct file *fp) | |
928fa666 TW |
364 | { |
365 | struct mei_cl_cb *cb; | |
366 | ||
367 | cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL); | |
368 | if (!cb) | |
369 | return NULL; | |
370 | ||
371 | INIT_LIST_HEAD(&cb->list); | |
62e8e6ad | 372 | cb->fp = fp; |
928fa666 TW |
373 | cb->cl = cl; |
374 | cb->buf_idx = 0; | |
375 | cb->fop_type = type; | |
376 | return cb; | |
377 | } | |
378 | ||
cc99ecfd | 379 | /** |
3908be6f | 380 | * __mei_io_list_flush - removes and frees cbs belonging to cl. |
cc99ecfd TW |
381 | * |
382 | * @list: an instance of our list structure | |
383 | * @cl: host client, can be NULL for flushing the whole list | |
384 | * @free: whether to free the cbs | |
9ca9050b | 385 | */ |
cc99ecfd TW |
386 | static void __mei_io_list_flush(struct mei_cl_cb *list, |
387 | struct mei_cl *cl, bool free) | |
9ca9050b | 388 | { |
928fa666 | 389 | struct mei_cl_cb *cb, *next; |
9ca9050b | 390 | |
cc99ecfd | 391 | /* enable removing everything if no cl is specified */ |
9ca9050b | 392 | list_for_each_entry_safe(cb, next, &list->list, list) { |
140c7553 | 393 | if (!cl || mei_cl_cmp_id(cl, cb->cl)) { |
928fa666 | 394 | list_del_init(&cb->list); |
cc99ecfd TW |
395 | if (free) |
396 | mei_io_cb_free(cb); | |
397 | } | |
9ca9050b TW |
398 | } |
399 | } | |
400 | ||
cc99ecfd TW |
401 | /** |
402 | * mei_io_list_flush - removes list entry belonging to cl. | |
403 | * | |
404 | * @list: An instance of our list structure | |
405 | * @cl: host client | |
406 | */ | |
5456796b | 407 | void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl) |
cc99ecfd TW |
408 | { |
409 | __mei_io_list_flush(list, cl, false); | |
410 | } | |
411 | ||
cc99ecfd TW |
412 | /** |
413 | * mei_io_list_free - removes cb belonging to cl and free them | |
414 | * | |
415 | * @list: An instance of our list structure | |
416 | * @cl: host client | |
417 | */ | |
418 | static inline void mei_io_list_free(struct mei_cl_cb *list, struct mei_cl *cl) | |
419 | { | |
420 | __mei_io_list_flush(list, cl, true); | |
421 | } | |
422 | ||
bca67d68 TW |
423 | /** |
424 | * mei_cl_alloc_cb - a convenient wrapper for allocating read cb | |
425 | * | |
426 | * @cl: host client | |
427 | * @length: size of the buffer | |
967b274e | 428 | * @fop_type: operation type |
bca67d68 TW |
429 | * @fp: associated file pointer (might be NULL) |
430 | * | |
431 | * Return: cb on success and NULL on failure | |
432 | */ | |
433 | struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length, | |
3030dc05 | 434 | enum mei_cb_file_ops fop_type, |
f23e2cc4 | 435 | const struct file *fp) |
bca67d68 TW |
436 | { |
437 | struct mei_cl_cb *cb; | |
438 | ||
3030dc05 | 439 | cb = mei_io_cb_init(cl, fop_type, fp); |
bca67d68 TW |
440 | if (!cb) |
441 | return NULL; | |
442 | ||
aab3b1a3 AU |
443 | if (length == 0) |
444 | return cb; | |
445 | ||
446 | cb->buf.data = kmalloc(length, GFP_KERNEL); | |
447 | if (!cb->buf.data) { | |
bca67d68 TW |
448 | mei_io_cb_free(cb); |
449 | return NULL; | |
450 | } | |
aab3b1a3 | 451 | cb->buf.size = length; |
bca67d68 TW |
452 | |
453 | return cb; | |
454 | } | |
455 | ||
3030dc05 TW |
456 | /** |
457 | * mei_cl_enqueue_ctrl_wr_cb - a convenient wrapper for allocating | |
458 | * and enqueuing of the control commands cb | |
459 | * | |
460 | * @cl: host client | |
461 | * @length: size of the buffer | |
967b274e | 462 | * @fop_type: operation type |
3030dc05 TW |
463 | * @fp: associated file pointer (might be NULL) |
464 | * | |
465 | * Return: cb on success and NULL on failure | |
466 | * Locking: called under "dev->device_lock" lock | |
467 | */ | |
468 | struct mei_cl_cb *mei_cl_enqueue_ctrl_wr_cb(struct mei_cl *cl, size_t length, | |
469 | enum mei_cb_file_ops fop_type, | |
470 | const struct file *fp) | |
471 | { | |
472 | struct mei_cl_cb *cb; | |
473 | ||
474 | /* for RX always allocate at least client's mtu */ | |
475 | if (length) | |
476 | length = max_t(size_t, length, mei_cl_mtu(cl)); | |
477 | ||
478 | cb = mei_cl_alloc_cb(cl, length, fop_type, fp); | |
479 | if (!cb) | |
480 | return NULL; | |
481 | ||
482 | list_add_tail(&cb->list, &cl->dev->ctrl_wr_list.list); | |
483 | return cb; | |
484 | } | |
485 | ||
a9bed610 TW |
486 | /** |
487 | * mei_cl_read_cb - find this cl's callback in the read list | |
488 | * for a specific file | |
489 | * | |
490 | * @cl: host client | |
491 | * @fp: file pointer (matching cb file object), may be NULL | |
492 | * | |
493 | * Return: cb on success, NULL if cb is not found | |
494 | */ | |
495 | struct mei_cl_cb *mei_cl_read_cb(const struct mei_cl *cl, const struct file *fp) | |
496 | { | |
497 | struct mei_cl_cb *cb; | |
498 | ||
499 | list_for_each_entry(cb, &cl->rd_completed, list) | |
62e8e6ad | 500 | if (!fp || fp == cb->fp) |
a9bed610 TW |
501 | return cb; |
502 | ||
503 | return NULL; | |
504 | } | |
505 | ||
506 | /** | |
507 | * mei_cl_read_cb_flush - free client's read pending and completed cbs | |
508 | * for a specific file | |
509 | * | |
510 | * @cl: host client | |
511 | * @fp: file pointer (matching cb file object), may be NULL | |
512 | */ | |
513 | void mei_cl_read_cb_flush(const struct mei_cl *cl, const struct file *fp) | |
514 | { | |
515 | struct mei_cl_cb *cb, *next; | |
516 | ||
517 | list_for_each_entry_safe(cb, next, &cl->rd_completed, list) | |
62e8e6ad | 518 | if (!fp || fp == cb->fp) |
a9bed610 TW |
519 | mei_io_cb_free(cb); |
520 | ||
521 | ||
522 | list_for_each_entry_safe(cb, next, &cl->rd_pending, list) | |
62e8e6ad | 523 | if (!fp || fp == cb->fp) |
a9bed610 TW |
524 | mei_io_cb_free(cb); |
525 | } | |
526 | ||
9ca9050b TW |
527 | /** |
528 | * mei_cl_flush_queues - flushes queue lists belonging to cl. | |
529 | * | |
9ca9050b | 530 | * @cl: host client |
a9bed610 | 531 | * @fp: file pointer (matching cb file object), may be NULL |
ce23139c AU |
532 | * |
533 | * Return: 0 on success, -EINVAL if cl or cl->dev is NULL. | |
9ca9050b | 534 | */ |
a9bed610 | 535 | int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp) |
9ca9050b | 536 | { |
c0abffbd AU |
537 | struct mei_device *dev; |
538 | ||
90e0b5f1 | 539 | if (WARN_ON(!cl || !cl->dev)) |
9ca9050b TW |
540 | return -EINVAL; |
541 | ||
c0abffbd AU |
542 | dev = cl->dev; |
543 | ||
544 | cl_dbg(dev, cl, "remove list entry belonging to cl\n"); | |
cc99ecfd TW |
545 | mei_io_list_free(&cl->dev->write_list, cl); |
546 | mei_io_list_free(&cl->dev->write_waiting_list, cl); | |
9ca9050b TW |
547 | mei_io_list_flush(&cl->dev->ctrl_wr_list, cl); |
548 | mei_io_list_flush(&cl->dev->ctrl_rd_list, cl); | |
549 | mei_io_list_flush(&cl->dev->amthif_cmd_list, cl); | |
a9bed610 TW |
550 | |
551 | mei_cl_read_cb_flush(cl, fp); | |
552 | ||
9ca9050b TW |
553 | return 0; |
554 | } | |
555 | ||
ab841160 | 556 | |
9ca9050b | 557 | /** |
83ce0741 | 558 | * mei_cl_init - initializes cl. |
9ca9050b TW |
559 | * |
560 | * @cl: host client to be initialized | |
561 | * @dev: mei device | |
562 | */ | |
563 | void mei_cl_init(struct mei_cl *cl, struct mei_device *dev) | |
564 | { | |
565 | memset(cl, 0, sizeof(struct mei_cl)); | |
566 | init_waitqueue_head(&cl->wait); | |
567 | init_waitqueue_head(&cl->rx_wait); | |
568 | init_waitqueue_head(&cl->tx_wait); | |
b38a362f | 569 | init_waitqueue_head(&cl->ev_wait); |
a9bed610 TW |
570 | INIT_LIST_HEAD(&cl->rd_completed); |
571 | INIT_LIST_HEAD(&cl->rd_pending); | |
9ca9050b | 572 | INIT_LIST_HEAD(&cl->link); |
9ca9050b | 573 | cl->writing_state = MEI_IDLE; |
bd47b526 | 574 | cl->state = MEI_FILE_UNINITIALIZED; |
9ca9050b TW |
575 | cl->dev = dev; |
576 | } | |
577 | ||
578 | /** | |
579 | * mei_cl_allocate - allocates cl structure and sets it up. | |
580 | * | |
581 | * @dev: mei device | |
a8605ea2 | 582 | * Return: The allocated file or NULL on failure |
9ca9050b TW |
583 | */ |
584 | struct mei_cl *mei_cl_allocate(struct mei_device *dev) | |
585 | { | |
586 | struct mei_cl *cl; | |
587 | ||
588 | cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL); | |
589 | if (!cl) | |
590 | return NULL; | |
591 | ||
592 | mei_cl_init(cl, dev); | |
593 | ||
594 | return cl; | |
595 | } | |
596 | ||
3908be6f AU |
597 | /** |
598 | * mei_cl_link - allocate host id in the host map | |
9ca9050b | 599 | * |
3908be6f | 600 | * @cl: host client |
393b148f | 601 | * |
a8605ea2 | 602 | * Return: 0 on success |
9ca9050b | 603 | * -EINVAL on incorrect values |
03b8d341 | 604 | * -EMFILE if open count exceeded. |
9ca9050b | 605 | */ |
7851e008 | 606 | int mei_cl_link(struct mei_cl *cl) |
9ca9050b | 607 | { |
90e0b5f1 | 608 | struct mei_device *dev; |
22f96a0e | 609 | long open_handle_count; |
7851e008 | 610 | int id; |
9ca9050b | 611 | |
781d0d89 | 612 | if (WARN_ON(!cl || !cl->dev)) |
9ca9050b TW |
613 | return -EINVAL; |
614 | ||
90e0b5f1 TW |
615 | dev = cl->dev; |
616 | ||
7851e008 | 617 | id = find_first_zero_bit(dev->host_clients_map, MEI_CLIENTS_MAX); |
781d0d89 | 618 | if (id >= MEI_CLIENTS_MAX) { |
2bf94cab | 619 | dev_err(dev->dev, "id exceeded %d", MEI_CLIENTS_MAX); |
e036cc57 TW |
620 | return -EMFILE; |
621 | } | |
622 | ||
22f96a0e TW |
623 | open_handle_count = dev->open_handle_count + dev->iamthif_open_count; |
624 | if (open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) { | |
2bf94cab | 625 | dev_err(dev->dev, "open_handle_count exceeded %d", |
e036cc57 TW |
626 | MEI_MAX_OPEN_HANDLE_COUNT); |
627 | return -EMFILE; | |
9ca9050b TW |
628 | } |
629 | ||
781d0d89 TW |
630 | dev->open_handle_count++; |
631 | ||
632 | cl->host_client_id = id; | |
633 | list_add_tail(&cl->link, &dev->file_list); | |
634 | ||
635 | set_bit(id, dev->host_clients_map); | |
636 | ||
637 | cl->state = MEI_FILE_INITIALIZING; | |
638 | ||
c0abffbd | 639 | cl_dbg(dev, cl, "link cl\n"); |
781d0d89 | 640 | return 0; |
9ca9050b | 641 | } |
781d0d89 | 642 | |
9ca9050b | 643 | /** |
d49ed64a | 644 | * mei_cl_unlink - remove host client from the list |
9ca9050b | 645 | * |
393b148f | 646 | * @cl: host client |
ce23139c AU |
647 | * |
648 | * Return: always 0 | |
9ca9050b | 649 | */ |
90e0b5f1 | 650 | int mei_cl_unlink(struct mei_cl *cl) |
9ca9050b | 651 | { |
90e0b5f1 | 652 | struct mei_device *dev; |
90e0b5f1 | 653 | |
781d0d89 TW |
654 | /* don't shout on error exit path */ |
655 | if (!cl) | |
656 | return 0; | |
657 | ||
fdd9b865 | 658 | /* amthif might not be initialized */ |
8e9a4a9a TW |
659 | if (!cl->dev) |
660 | return 0; | |
90e0b5f1 TW |
661 | |
662 | dev = cl->dev; | |
663 | ||
a14c44d8 TW |
664 | cl_dbg(dev, cl, "unlink client"); |
665 | ||
22f96a0e TW |
666 | if (dev->open_handle_count > 0) |
667 | dev->open_handle_count--; | |
668 | ||
669 | /* never clear the 0 bit */ | |
670 | if (cl->host_client_id) | |
671 | clear_bit(cl->host_client_id, dev->host_clients_map); | |
672 | ||
673 | list_del_init(&cl->link); | |
674 | ||
bd47b526 | 675 | cl->state = MEI_FILE_UNINITIALIZED; |
7c7a6077 AU |
676 | cl->writing_state = MEI_IDLE; |
677 | ||
678 | WARN_ON(!list_empty(&cl->rd_completed) || | |
679 | !list_empty(&cl->rd_pending) || | |
680 | !list_empty(&cl->link)); | |
22f96a0e | 681 | |
90e0b5f1 | 682 | return 0; |
9ca9050b TW |
683 | } |
684 | ||
025fb792 | 685 | void mei_host_client_init(struct mei_device *dev) |
9ca9050b | 686 | { |
9ca9050b | 687 | dev->dev_state = MEI_DEV_ENABLED; |
6adb8efb | 688 | dev->reset_count = 0; |
04bb139a | 689 | |
025fb792 | 690 | schedule_work(&dev->bus_rescan_work); |
6009595a | 691 | |
2bf94cab TW |
692 | pm_runtime_mark_last_busy(dev->dev); |
693 | dev_dbg(dev->dev, "rpm: autosuspend\n"); | |
d5f8e166 | 694 | pm_request_autosuspend(dev->dev); |
9ca9050b TW |
695 | } |
696 | ||
6aae48ff | 697 | /** |
a8605ea2 | 698 | * mei_hbuf_acquire - try to acquire host buffer |
6aae48ff TW |
699 | * |
700 | * @dev: the device structure | |
a8605ea2 | 701 | * Return: true if host buffer was acquired |
6aae48ff TW |
702 | */ |
703 | bool mei_hbuf_acquire(struct mei_device *dev) | |
704 | { | |
04bb139a | 705 | if (mei_pg_state(dev) == MEI_PG_ON || |
3dc196ea | 706 | mei_pg_in_transition(dev)) { |
2bf94cab | 707 | dev_dbg(dev->dev, "device is in pg\n"); |
04bb139a TW |
708 | return false; |
709 | } | |
710 | ||
6aae48ff | 711 | if (!dev->hbuf_is_ready) { |
2bf94cab | 712 | dev_dbg(dev->dev, "hbuf is not ready\n"); |
6aae48ff TW |
713 | return false; |
714 | } | |
715 | ||
716 | dev->hbuf_is_ready = false; | |
717 | ||
718 | return true; | |
719 | } | |
9ca9050b | 720 | |
a4307fe4 AU |
721 | /** |
722 | * mei_cl_wake_all - wake up readers, writers and event waiters so | |
723 | * they can be interrupted | |
724 | * | |
725 | * @cl: host client | |
726 | */ | |
727 | static void mei_cl_wake_all(struct mei_cl *cl) | |
728 | { | |
729 | struct mei_device *dev = cl->dev; | |
730 | ||
731 | /* synchronized under device mutex */ | |
732 | if (waitqueue_active(&cl->rx_wait)) { | |
733 | cl_dbg(dev, cl, "Waking up reading client!\n"); | |
734 | wake_up_interruptible(&cl->rx_wait); | |
735 | } | |
736 | /* synchronized under device mutex */ | |
737 | if (waitqueue_active(&cl->tx_wait)) { | |
738 | cl_dbg(dev, cl, "Waking up writing client!\n"); | |
739 | wake_up_interruptible(&cl->tx_wait); | |
740 | } | |
741 | /* synchronized under device mutex */ | |
742 | if (waitqueue_active(&cl->ev_wait)) { | |
743 | cl_dbg(dev, cl, "Waking up waiting for event clients!\n"); | |
744 | wake_up_interruptible(&cl->ev_wait); | |
745 | } | |
7ff4bdd4 AU |
746 | /* synchronized under device mutex */ |
747 | if (waitqueue_active(&cl->wait)) { | |
748 | cl_dbg(dev, cl, "Waking up ctrl write clients!\n"); | |
69f1804a | 749 | wake_up(&cl->wait); |
7ff4bdd4 | 750 | } |
a4307fe4 AU |
751 | } |
752 | ||
3c666182 TW |
753 | /** |
754 | * mei_cl_set_disconnected - set disconnected state and clear | |
755 | * associated states and resources | |
756 | * | |
757 | * @cl: host client | |
758 | */ | |
759 | void mei_cl_set_disconnected(struct mei_cl *cl) | |
760 | { | |
761 | struct mei_device *dev = cl->dev; | |
762 | ||
763 | if (cl->state == MEI_FILE_DISCONNECTED || | |
bd47b526 | 764 | cl->state <= MEI_FILE_INITIALIZING) |
3c666182 TW |
765 | return; |
766 | ||
767 | cl->state = MEI_FILE_DISCONNECTED; | |
a4307fe4 AU |
768 | mei_io_list_free(&dev->write_list, cl); |
769 | mei_io_list_free(&dev->write_waiting_list, cl); | |
3c666182 TW |
770 | mei_io_list_flush(&dev->ctrl_rd_list, cl); |
771 | mei_io_list_flush(&dev->ctrl_wr_list, cl); | |
a4307fe4 | 772 | mei_cl_wake_all(cl); |
46978ada | 773 | cl->rx_flow_ctrl_creds = 0; |
4034b81b | 774 | cl->tx_flow_ctrl_creds = 0; |
3c666182 | 775 | cl->timer_count = 0; |
d49ed64a | 776 | |
a03d77f6 AU |
777 | if (!cl->me_cl) |
778 | return; | |
779 | ||
780 | if (!WARN_ON(cl->me_cl->connect_count == 0)) | |
781 | cl->me_cl->connect_count--; | |
782 | ||
c241e9b1 | 783 | if (cl->me_cl->connect_count == 0) |
4034b81b | 784 | cl->me_cl->tx_flow_ctrl_creds = 0; |
c241e9b1 | 785 | |
d49ed64a AU |
786 | mei_me_cl_put(cl->me_cl); |
787 | cl->me_cl = NULL; | |
3c666182 TW |
788 | } |
789 | ||
a03d77f6 AU |
790 | static int mei_cl_set_connecting(struct mei_cl *cl, struct mei_me_client *me_cl) |
791 | { | |
1df629ef | 792 | if (!mei_me_cl_get(me_cl)) |
a03d77f6 AU |
793 | return -ENOENT; |
794 | ||
1df629ef AU |
795 | /* only one connection is allowed for fixed address clients */ |
796 | if (me_cl->props.fixed_address) { | |
797 | if (me_cl->connect_count) { | |
798 | mei_me_cl_put(me_cl); | |
799 | return -EBUSY; | |
800 | } | |
801 | } | |
802 | ||
803 | cl->me_cl = me_cl; | |
a03d77f6 AU |
804 | cl->state = MEI_FILE_CONNECTING; |
805 | cl->me_cl->connect_count++; | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
3c666182 TW |
810 | /* |
811 | * mei_cl_send_disconnect - send disconnect request | |
812 | * | |
813 | * @cl: host client | |
814 | * @cb: callback block | |
815 | * | |
816 | * Return: 0, OK; otherwise, error. | |
817 | */ | |
818 | static int mei_cl_send_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb) | |
819 | { | |
820 | struct mei_device *dev; | |
821 | int ret; | |
822 | ||
823 | dev = cl->dev; | |
824 | ||
825 | ret = mei_hbm_cl_disconnect_req(dev, cl); | |
826 | cl->status = ret; | |
827 | if (ret) { | |
828 | cl->state = MEI_FILE_DISCONNECT_REPLY; | |
829 | return ret; | |
830 | } | |
831 | ||
832 | list_move_tail(&cb->list, &dev->ctrl_rd_list.list); | |
833 | cl->timer_count = MEI_CONNECT_TIMEOUT; | |
1892fc2e | 834 | mei_schedule_stall_timer(dev); |
3c666182 TW |
835 | |
836 | return 0; | |
837 | } | |
838 | ||
839 | /** | |
840 | * mei_cl_irq_disconnect - processes close related operation from | |
841 | * interrupt thread context - send disconnect request | |
842 | * | |
843 | * @cl: client | |
844 | * @cb: callback block. | |
845 | * @cmpl_list: complete list. | |
846 | * | |
847 | * Return: 0, OK; otherwise, error. | |
848 | */ | |
849 | int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb, | |
850 | struct mei_cl_cb *cmpl_list) | |
851 | { | |
852 | struct mei_device *dev = cl->dev; | |
853 | u32 msg_slots; | |
854 | int slots; | |
855 | int ret; | |
856 | ||
857 | msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request)); | |
858 | slots = mei_hbuf_empty_slots(dev); | |
859 | ||
860 | if (slots < msg_slots) | |
861 | return -EMSGSIZE; | |
862 | ||
863 | ret = mei_cl_send_disconnect(cl, cb); | |
864 | if (ret) | |
865 | list_move_tail(&cb->list, &cmpl_list->list); | |
866 | ||
867 | return ret; | |
868 | } | |
869 | ||
9ca9050b | 870 | /** |
18901357 AU |
871 | * __mei_cl_disconnect - disconnect host client from the me one |
872 | * internal function runtime pm has to be already acquired | |
9ca9050b | 873 | * |
90e0b5f1 | 874 | * @cl: host client |
9ca9050b | 875 | * |
a8605ea2 | 876 | * Return: 0 on success, <0 on failure. |
9ca9050b | 877 | */ |
18901357 | 878 | static int __mei_cl_disconnect(struct mei_cl *cl) |
9ca9050b | 879 | { |
90e0b5f1 | 880 | struct mei_device *dev; |
9ca9050b | 881 | struct mei_cl_cb *cb; |
fe2f17eb | 882 | int rets; |
9ca9050b | 883 | |
90e0b5f1 TW |
884 | dev = cl->dev; |
885 | ||
3c666182 TW |
886 | cl->state = MEI_FILE_DISCONNECTING; |
887 | ||
3030dc05 TW |
888 | cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DISCONNECT, NULL); |
889 | if (!cb) { | |
890 | rets = -ENOMEM; | |
3c666182 | 891 | goto out; |
3030dc05 | 892 | } |
5a8373fb | 893 | |
6aae48ff | 894 | if (mei_hbuf_acquire(dev)) { |
3c666182 TW |
895 | rets = mei_cl_send_disconnect(cl, cb); |
896 | if (rets) { | |
c0abffbd | 897 | cl_err(dev, cl, "failed to disconnect.\n"); |
3c666182 | 898 | goto out; |
9ca9050b | 899 | } |
9ca9050b | 900 | } |
9ca9050b | 901 | |
3c666182 | 902 | mutex_unlock(&dev->device_lock); |
7ff4bdd4 AU |
903 | wait_event_timeout(cl->wait, |
904 | cl->state == MEI_FILE_DISCONNECT_REPLY || | |
905 | cl->state == MEI_FILE_DISCONNECTED, | |
3c666182 | 906 | mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); |
9ca9050b | 907 | mutex_lock(&dev->device_lock); |
fe2f17eb | 908 | |
3c666182 | 909 | rets = cl->status; |
7ff4bdd4 AU |
910 | if (cl->state != MEI_FILE_DISCONNECT_REPLY && |
911 | cl->state != MEI_FILE_DISCONNECTED) { | |
fe2f17eb AU |
912 | cl_dbg(dev, cl, "timeout on disconnect from FW client.\n"); |
913 | rets = -ETIME; | |
9ca9050b TW |
914 | } |
915 | ||
3c666182 TW |
916 | out: |
917 | /* we disconnect also on error */ | |
918 | mei_cl_set_disconnected(cl); | |
919 | if (!rets) | |
920 | cl_dbg(dev, cl, "successfully disconnected from FW client.\n"); | |
921 | ||
18901357 AU |
922 | mei_io_cb_free(cb); |
923 | return rets; | |
924 | } | |
925 | ||
926 | /** | |
927 | * mei_cl_disconnect - disconnect host client from the me one | |
928 | * | |
929 | * @cl: host client | |
930 | * | |
931 | * Locking: called under "dev->device_lock" lock | |
932 | * | |
933 | * Return: 0 on success, <0 on failure. | |
934 | */ | |
935 | int mei_cl_disconnect(struct mei_cl *cl) | |
936 | { | |
937 | struct mei_device *dev; | |
938 | int rets; | |
939 | ||
940 | if (WARN_ON(!cl || !cl->dev)) | |
941 | return -ENODEV; | |
942 | ||
943 | dev = cl->dev; | |
944 | ||
945 | cl_dbg(dev, cl, "disconnecting"); | |
946 | ||
947 | if (!mei_cl_is_connected(cl)) | |
948 | return 0; | |
949 | ||
950 | if (mei_cl_is_fixed_address(cl)) { | |
951 | mei_cl_set_disconnected(cl); | |
952 | return 0; | |
953 | } | |
954 | ||
955 | rets = pm_runtime_get(dev->dev); | |
956 | if (rets < 0 && rets != -EINPROGRESS) { | |
957 | pm_runtime_put_noidle(dev->dev); | |
958 | cl_err(dev, cl, "rpm: get failed %d\n", rets); | |
959 | return rets; | |
960 | } | |
961 | ||
962 | rets = __mei_cl_disconnect(cl); | |
963 | ||
04bb139a | 964 | cl_dbg(dev, cl, "rpm: autosuspend\n"); |
2bf94cab TW |
965 | pm_runtime_mark_last_busy(dev->dev); |
966 | pm_runtime_put_autosuspend(dev->dev); | |
04bb139a | 967 | |
9ca9050b TW |
968 | return rets; |
969 | } | |
970 | ||
971 | ||
972 | /** | |
90e0b5f1 TW |
973 | * mei_cl_is_other_connecting - checks if other |
974 | * client with the same me client id is connecting | |
9ca9050b | 975 | * |
9ca9050b TW |
976 | * @cl: private data of the file object |
977 | * | |
a8605ea2 | 978 | * Return: true if other client is connected, false - otherwise. |
9ca9050b | 979 | */ |
0c53357c | 980 | static bool mei_cl_is_other_connecting(struct mei_cl *cl) |
9ca9050b | 981 | { |
90e0b5f1 | 982 | struct mei_device *dev; |
0c53357c | 983 | struct mei_cl_cb *cb; |
90e0b5f1 TW |
984 | |
985 | dev = cl->dev; | |
986 | ||
0c53357c TW |
987 | list_for_each_entry(cb, &dev->ctrl_rd_list.list, list) { |
988 | if (cb->fop_type == MEI_FOP_CONNECT && | |
d49ed64a | 989 | mei_cl_me_id(cl) == mei_cl_me_id(cb->cl)) |
90e0b5f1 | 990 | return true; |
9ca9050b | 991 | } |
90e0b5f1 TW |
992 | |
993 | return false; | |
9ca9050b TW |
994 | } |
995 | ||
0c53357c TW |
996 | /** |
997 | * mei_cl_send_connect - send connect request | |
998 | * | |
999 | * @cl: host client | |
1000 | * @cb: callback block | |
1001 | * | |
1002 | * Return: 0, OK; otherwise, error. | |
1003 | */ | |
1004 | static int mei_cl_send_connect(struct mei_cl *cl, struct mei_cl_cb *cb) | |
1005 | { | |
1006 | struct mei_device *dev; | |
1007 | int ret; | |
1008 | ||
1009 | dev = cl->dev; | |
1010 | ||
1011 | ret = mei_hbm_cl_connect_req(dev, cl); | |
1012 | cl->status = ret; | |
1013 | if (ret) { | |
1014 | cl->state = MEI_FILE_DISCONNECT_REPLY; | |
1015 | return ret; | |
1016 | } | |
1017 | ||
1018 | list_move_tail(&cb->list, &dev->ctrl_rd_list.list); | |
1019 | cl->timer_count = MEI_CONNECT_TIMEOUT; | |
1892fc2e | 1020 | mei_schedule_stall_timer(dev); |
0c53357c TW |
1021 | return 0; |
1022 | } | |
1023 | ||
1024 | /** | |
1025 | * mei_cl_irq_connect - send connect request in irq_thread context | |
1026 | * | |
1027 | * @cl: host client | |
1028 | * @cb: callback block | |
1029 | * @cmpl_list: complete list | |
1030 | * | |
1031 | * Return: 0, OK; otherwise, error. | |
1032 | */ | |
1033 | int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb, | |
1034 | struct mei_cl_cb *cmpl_list) | |
1035 | { | |
1036 | struct mei_device *dev = cl->dev; | |
1037 | u32 msg_slots; | |
1038 | int slots; | |
1039 | int rets; | |
1040 | ||
1041 | msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request)); | |
1042 | slots = mei_hbuf_empty_slots(dev); | |
1043 | ||
1044 | if (mei_cl_is_other_connecting(cl)) | |
1045 | return 0; | |
1046 | ||
1047 | if (slots < msg_slots) | |
1048 | return -EMSGSIZE; | |
1049 | ||
1050 | rets = mei_cl_send_connect(cl, cb); | |
1051 | if (rets) | |
1052 | list_move_tail(&cb->list, &cmpl_list->list); | |
1053 | ||
1054 | return rets; | |
1055 | } | |
1056 | ||
9f81abda | 1057 | /** |
83ce0741 | 1058 | * mei_cl_connect - connect host client to the me one |
9f81abda TW |
1059 | * |
1060 | * @cl: host client | |
d49ed64a | 1061 | * @me_cl: me client |
3030dc05 | 1062 | * @fp: pointer to file structure |
9f81abda TW |
1063 | * |
1064 | * Locking: called under "dev->device_lock" lock | |
1065 | * | |
a8605ea2 | 1066 | * Return: 0 on success, <0 on failure. |
9f81abda | 1067 | */ |
d49ed64a | 1068 | int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl, |
3030dc05 | 1069 | const struct file *fp) |
9f81abda TW |
1070 | { |
1071 | struct mei_device *dev; | |
1072 | struct mei_cl_cb *cb; | |
9f81abda TW |
1073 | int rets; |
1074 | ||
1df629ef | 1075 | if (WARN_ON(!cl || !cl->dev || !me_cl)) |
9f81abda TW |
1076 | return -ENODEV; |
1077 | ||
1078 | dev = cl->dev; | |
1079 | ||
1df629ef AU |
1080 | rets = mei_cl_set_connecting(cl, me_cl); |
1081 | if (rets) | |
1082 | return rets; | |
1083 | ||
1084 | if (mei_cl_is_fixed_address(cl)) { | |
1085 | cl->state = MEI_FILE_CONNECTED; | |
1086 | return 0; | |
1087 | } | |
1088 | ||
2bf94cab | 1089 | rets = pm_runtime_get(dev->dev); |
04bb139a | 1090 | if (rets < 0 && rets != -EINPROGRESS) { |
2bf94cab | 1091 | pm_runtime_put_noidle(dev->dev); |
04bb139a | 1092 | cl_err(dev, cl, "rpm: get failed %d\n", rets); |
1df629ef | 1093 | goto nortpm; |
04bb139a TW |
1094 | } |
1095 | ||
3030dc05 TW |
1096 | cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_CONNECT, fp); |
1097 | if (!cb) { | |
1098 | rets = -ENOMEM; | |
9f81abda | 1099 | goto out; |
3030dc05 | 1100 | } |
0c53357c | 1101 | |
6aae48ff TW |
1102 | /* run hbuf acquire last so we don't have to undo */ |
1103 | if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) { | |
0c53357c TW |
1104 | rets = mei_cl_send_connect(cl, cb); |
1105 | if (rets) | |
9f81abda | 1106 | goto out; |
9f81abda TW |
1107 | } |
1108 | ||
1109 | mutex_unlock(&dev->device_lock); | |
12f45ed4 | 1110 | wait_event_timeout(cl->wait, |
285e2996 | 1111 | (cl->state == MEI_FILE_CONNECTED || |
7ff4bdd4 | 1112 | cl->state == MEI_FILE_DISCONNECTED || |
18901357 | 1113 | cl->state == MEI_FILE_DISCONNECT_REQUIRED || |
3c666182 | 1114 | cl->state == MEI_FILE_DISCONNECT_REPLY), |
285e2996 | 1115 | mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); |
9f81abda TW |
1116 | mutex_lock(&dev->device_lock); |
1117 | ||
f3de9b63 | 1118 | if (!mei_cl_is_connected(cl)) { |
18901357 AU |
1119 | if (cl->state == MEI_FILE_DISCONNECT_REQUIRED) { |
1120 | mei_io_list_flush(&dev->ctrl_rd_list, cl); | |
1121 | mei_io_list_flush(&dev->ctrl_wr_list, cl); | |
1122 | /* ignore disconnect return valuue; | |
1123 | * in case of failure reset will be invoked | |
1124 | */ | |
1125 | __mei_cl_disconnect(cl); | |
1126 | rets = -EFAULT; | |
1127 | goto out; | |
1128 | } | |
1129 | ||
0c53357c | 1130 | /* timeout or something went really wrong */ |
285e2996 AU |
1131 | if (!cl->status) |
1132 | cl->status = -EFAULT; | |
9f81abda TW |
1133 | } |
1134 | ||
1135 | rets = cl->status; | |
9f81abda | 1136 | out: |
04bb139a | 1137 | cl_dbg(dev, cl, "rpm: autosuspend\n"); |
2bf94cab TW |
1138 | pm_runtime_mark_last_busy(dev->dev); |
1139 | pm_runtime_put_autosuspend(dev->dev); | |
04bb139a | 1140 | |
9f81abda | 1141 | mei_io_cb_free(cb); |
0c53357c | 1142 | |
1df629ef | 1143 | nortpm: |
0c53357c TW |
1144 | if (!mei_cl_is_connected(cl)) |
1145 | mei_cl_set_disconnected(cl); | |
1146 | ||
9f81abda TW |
1147 | return rets; |
1148 | } | |
1149 | ||
03b8d341 TW |
1150 | /** |
1151 | * mei_cl_alloc_linked - allocate and link host client | |
1152 | * | |
1153 | * @dev: the device structure | |
03b8d341 TW |
1154 | * |
1155 | * Return: cl on success ERR_PTR on failure | |
1156 | */ | |
7851e008 | 1157 | struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev) |
03b8d341 TW |
1158 | { |
1159 | struct mei_cl *cl; | |
1160 | int ret; | |
1161 | ||
1162 | cl = mei_cl_allocate(dev); | |
1163 | if (!cl) { | |
1164 | ret = -ENOMEM; | |
1165 | goto err; | |
1166 | } | |
1167 | ||
7851e008 | 1168 | ret = mei_cl_link(cl); |
03b8d341 TW |
1169 | if (ret) |
1170 | goto err; | |
1171 | ||
1172 | return cl; | |
1173 | err: | |
1174 | kfree(cl); | |
1175 | return ERR_PTR(ret); | |
1176 | } | |
1177 | ||
9ca9050b | 1178 | /** |
4034b81b | 1179 | * mei_cl_tx_flow_ctrl_creds - checks flow_control credits for cl. |
9ca9050b | 1180 | * |
06ee536b | 1181 | * @cl: host client |
9ca9050b | 1182 | * |
4034b81b | 1183 | * Return: 1 if tx_flow_ctrl_creds >0, 0 - otherwise. |
9ca9050b | 1184 | */ |
4034b81b | 1185 | static int mei_cl_tx_flow_ctrl_creds(struct mei_cl *cl) |
9ca9050b | 1186 | { |
d49ed64a | 1187 | if (WARN_ON(!cl || !cl->me_cl)) |
90e0b5f1 TW |
1188 | return -EINVAL; |
1189 | ||
4034b81b | 1190 | if (cl->tx_flow_ctrl_creds > 0) |
9ca9050b TW |
1191 | return 1; |
1192 | ||
a808c80c | 1193 | if (mei_cl_is_fixed_address(cl)) |
1df629ef | 1194 | return 1; |
1df629ef | 1195 | |
d49ed64a | 1196 | if (mei_cl_is_single_recv_buf(cl)) { |
4034b81b | 1197 | if (cl->me_cl->tx_flow_ctrl_creds > 0) |
d49ed64a | 1198 | return 1; |
9ca9050b | 1199 | } |
d49ed64a | 1200 | return 0; |
9ca9050b TW |
1201 | } |
1202 | ||
1203 | /** | |
4034b81b TW |
1204 | * mei_cl_tx_flow_ctrl_creds_reduce - reduces transmit flow control credits |
1205 | * for a client | |
9ca9050b | 1206 | * |
4034b81b | 1207 | * @cl: host client |
393b148f | 1208 | * |
a8605ea2 | 1209 | * Return: |
9ca9050b | 1210 | * 0 on success |
9ca9050b TW |
1211 | * -EINVAL when ctrl credits are <= 0 |
1212 | */ | |
4034b81b | 1213 | static int mei_cl_tx_flow_ctrl_creds_reduce(struct mei_cl *cl) |
9ca9050b | 1214 | { |
d49ed64a | 1215 | if (WARN_ON(!cl || !cl->me_cl)) |
90e0b5f1 TW |
1216 | return -EINVAL; |
1217 | ||
1df629ef AU |
1218 | if (mei_cl_is_fixed_address(cl)) |
1219 | return 0; | |
1220 | ||
d49ed64a | 1221 | if (mei_cl_is_single_recv_buf(cl)) { |
4034b81b | 1222 | if (WARN_ON(cl->me_cl->tx_flow_ctrl_creds <= 0)) |
d49ed64a | 1223 | return -EINVAL; |
4034b81b | 1224 | cl->me_cl->tx_flow_ctrl_creds--; |
12d00665 | 1225 | } else { |
4034b81b | 1226 | if (WARN_ON(cl->tx_flow_ctrl_creds <= 0)) |
d49ed64a | 1227 | return -EINVAL; |
4034b81b | 1228 | cl->tx_flow_ctrl_creds--; |
9ca9050b | 1229 | } |
d49ed64a | 1230 | return 0; |
9ca9050b TW |
1231 | } |
1232 | ||
51678ccb TW |
1233 | /** |
1234 | * mei_cl_notify_fop2req - convert fop to proper request | |
1235 | * | |
1236 | * @fop: client notification start response command | |
1237 | * | |
1238 | * Return: MEI_HBM_NOTIFICATION_START/STOP | |
1239 | */ | |
1240 | u8 mei_cl_notify_fop2req(enum mei_cb_file_ops fop) | |
1241 | { | |
1242 | if (fop == MEI_FOP_NOTIFY_START) | |
1243 | return MEI_HBM_NOTIFICATION_START; | |
1244 | else | |
1245 | return MEI_HBM_NOTIFICATION_STOP; | |
1246 | } | |
1247 | ||
1248 | /** | |
1249 | * mei_cl_notify_req2fop - convert notification request top file operation type | |
1250 | * | |
1251 | * @req: hbm notification request type | |
1252 | * | |
1253 | * Return: MEI_FOP_NOTIFY_START/STOP | |
1254 | */ | |
1255 | enum mei_cb_file_ops mei_cl_notify_req2fop(u8 req) | |
1256 | { | |
1257 | if (req == MEI_HBM_NOTIFICATION_START) | |
1258 | return MEI_FOP_NOTIFY_START; | |
1259 | else | |
1260 | return MEI_FOP_NOTIFY_STOP; | |
1261 | } | |
1262 | ||
1263 | /** | |
1264 | * mei_cl_irq_notify - send notification request in irq_thread context | |
1265 | * | |
1266 | * @cl: client | |
1267 | * @cb: callback block. | |
1268 | * @cmpl_list: complete list. | |
1269 | * | |
1270 | * Return: 0 on such and error otherwise. | |
1271 | */ | |
1272 | int mei_cl_irq_notify(struct mei_cl *cl, struct mei_cl_cb *cb, | |
1273 | struct mei_cl_cb *cmpl_list) | |
1274 | { | |
1275 | struct mei_device *dev = cl->dev; | |
1276 | u32 msg_slots; | |
1277 | int slots; | |
1278 | int ret; | |
1279 | bool request; | |
1280 | ||
1281 | msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request)); | |
1282 | slots = mei_hbuf_empty_slots(dev); | |
1283 | ||
1284 | if (slots < msg_slots) | |
1285 | return -EMSGSIZE; | |
1286 | ||
1287 | request = mei_cl_notify_fop2req(cb->fop_type); | |
1288 | ret = mei_hbm_cl_notify_req(dev, cl, request); | |
1289 | if (ret) { | |
1290 | cl->status = ret; | |
1291 | list_move_tail(&cb->list, &cmpl_list->list); | |
1292 | return ret; | |
1293 | } | |
1294 | ||
1295 | list_move_tail(&cb->list, &dev->ctrl_rd_list.list); | |
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | /** | |
1300 | * mei_cl_notify_request - send notification stop/start request | |
1301 | * | |
1302 | * @cl: host client | |
3030dc05 | 1303 | * @fp: associate request with file |
51678ccb TW |
1304 | * @request: 1 for start or 0 for stop |
1305 | * | |
1306 | * Locking: called under "dev->device_lock" lock | |
1307 | * | |
1308 | * Return: 0 on such and error otherwise. | |
1309 | */ | |
f23e2cc4 | 1310 | int mei_cl_notify_request(struct mei_cl *cl, |
3030dc05 | 1311 | const struct file *fp, u8 request) |
51678ccb TW |
1312 | { |
1313 | struct mei_device *dev; | |
1314 | struct mei_cl_cb *cb; | |
1315 | enum mei_cb_file_ops fop_type; | |
1316 | int rets; | |
1317 | ||
1318 | if (WARN_ON(!cl || !cl->dev)) | |
1319 | return -ENODEV; | |
1320 | ||
1321 | dev = cl->dev; | |
1322 | ||
1323 | if (!dev->hbm_f_ev_supported) { | |
1324 | cl_dbg(dev, cl, "notifications not supported\n"); | |
1325 | return -EOPNOTSUPP; | |
1326 | } | |
1327 | ||
1328 | rets = pm_runtime_get(dev->dev); | |
1329 | if (rets < 0 && rets != -EINPROGRESS) { | |
1330 | pm_runtime_put_noidle(dev->dev); | |
1331 | cl_err(dev, cl, "rpm: get failed %d\n", rets); | |
1332 | return rets; | |
1333 | } | |
1334 | ||
1335 | fop_type = mei_cl_notify_req2fop(request); | |
3030dc05 | 1336 | cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, fop_type, fp); |
51678ccb TW |
1337 | if (!cb) { |
1338 | rets = -ENOMEM; | |
1339 | goto out; | |
1340 | } | |
1341 | ||
1342 | if (mei_hbuf_acquire(dev)) { | |
1343 | if (mei_hbm_cl_notify_req(dev, cl, request)) { | |
1344 | rets = -ENODEV; | |
1345 | goto out; | |
1346 | } | |
3030dc05 | 1347 | list_move_tail(&cb->list, &dev->ctrl_rd_list.list); |
51678ccb TW |
1348 | } |
1349 | ||
1350 | mutex_unlock(&dev->device_lock); | |
7ff4bdd4 AU |
1351 | wait_event_timeout(cl->wait, |
1352 | cl->notify_en == request || !mei_cl_is_connected(cl), | |
1353 | mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); | |
51678ccb TW |
1354 | mutex_lock(&dev->device_lock); |
1355 | ||
4a8eaa96 AU |
1356 | if (cl->notify_en != request && !cl->status) |
1357 | cl->status = -EFAULT; | |
51678ccb TW |
1358 | |
1359 | rets = cl->status; | |
1360 | ||
1361 | out: | |
1362 | cl_dbg(dev, cl, "rpm: autosuspend\n"); | |
1363 | pm_runtime_mark_last_busy(dev->dev); | |
1364 | pm_runtime_put_autosuspend(dev->dev); | |
1365 | ||
1366 | mei_io_cb_free(cb); | |
1367 | return rets; | |
1368 | } | |
1369 | ||
237092bf TW |
1370 | /** |
1371 | * mei_cl_notify - raise notification | |
1372 | * | |
1373 | * @cl: host client | |
1374 | * | |
1375 | * Locking: called under "dev->device_lock" lock | |
1376 | */ | |
1377 | void mei_cl_notify(struct mei_cl *cl) | |
1378 | { | |
1379 | struct mei_device *dev; | |
1380 | ||
1381 | if (!cl || !cl->dev) | |
1382 | return; | |
1383 | ||
1384 | dev = cl->dev; | |
1385 | ||
1386 | if (!cl->notify_en) | |
1387 | return; | |
1388 | ||
1389 | cl_dbg(dev, cl, "notify event"); | |
1390 | cl->notify_ev = true; | |
850f8940 TW |
1391 | if (!mei_cl_bus_notify_event(cl)) |
1392 | wake_up_interruptible(&cl->ev_wait); | |
237092bf TW |
1393 | |
1394 | if (cl->ev_async) | |
1395 | kill_fasync(&cl->ev_async, SIGIO, POLL_PRI); | |
bb2ef9c3 | 1396 | |
237092bf TW |
1397 | } |
1398 | ||
b38a362f TW |
1399 | /** |
1400 | * mei_cl_notify_get - get or wait for notification event | |
1401 | * | |
1402 | * @cl: host client | |
1403 | * @block: this request is blocking | |
1404 | * @notify_ev: true if notification event was received | |
1405 | * | |
1406 | * Locking: called under "dev->device_lock" lock | |
1407 | * | |
1408 | * Return: 0 on such and error otherwise. | |
1409 | */ | |
1410 | int mei_cl_notify_get(struct mei_cl *cl, bool block, bool *notify_ev) | |
1411 | { | |
1412 | struct mei_device *dev; | |
1413 | int rets; | |
1414 | ||
1415 | *notify_ev = false; | |
1416 | ||
1417 | if (WARN_ON(!cl || !cl->dev)) | |
1418 | return -ENODEV; | |
1419 | ||
1420 | dev = cl->dev; | |
1421 | ||
1422 | if (!mei_cl_is_connected(cl)) | |
1423 | return -ENODEV; | |
1424 | ||
1425 | if (cl->notify_ev) | |
1426 | goto out; | |
1427 | ||
1428 | if (!block) | |
1429 | return -EAGAIN; | |
1430 | ||
1431 | mutex_unlock(&dev->device_lock); | |
1432 | rets = wait_event_interruptible(cl->ev_wait, cl->notify_ev); | |
1433 | mutex_lock(&dev->device_lock); | |
1434 | ||
1435 | if (rets < 0) | |
1436 | return rets; | |
1437 | ||
1438 | out: | |
1439 | *notify_ev = cl->notify_ev; | |
1440 | cl->notify_ev = false; | |
1441 | return 0; | |
1442 | } | |
1443 | ||
ab841160 | 1444 | /** |
393b148f | 1445 | * mei_cl_read_start - the start read client message function. |
ab841160 | 1446 | * |
90e0b5f1 | 1447 | * @cl: host client |
ce23139c | 1448 | * @length: number of bytes to read |
bca67d68 | 1449 | * @fp: pointer to file structure |
ab841160 | 1450 | * |
a8605ea2 | 1451 | * Return: 0 on success, <0 on failure. |
ab841160 | 1452 | */ |
f23e2cc4 | 1453 | int mei_cl_read_start(struct mei_cl *cl, size_t length, const struct file *fp) |
ab841160 | 1454 | { |
90e0b5f1 | 1455 | struct mei_device *dev; |
ab841160 | 1456 | struct mei_cl_cb *cb; |
664df38b | 1457 | int rets; |
ab841160 | 1458 | |
90e0b5f1 TW |
1459 | if (WARN_ON(!cl || !cl->dev)) |
1460 | return -ENODEV; | |
1461 | ||
1462 | dev = cl->dev; | |
1463 | ||
b950ac1d | 1464 | if (!mei_cl_is_connected(cl)) |
ab841160 OW |
1465 | return -ENODEV; |
1466 | ||
d49ed64a AU |
1467 | if (!mei_me_cl_is_active(cl->me_cl)) { |
1468 | cl_err(dev, cl, "no such me client\n"); | |
7ca96aa2 | 1469 | return -ENOTTY; |
664df38b | 1470 | } |
1df629ef | 1471 | |
9d27e73c | 1472 | if (mei_cl_is_fixed_address(cl) || cl == &dev->iamthif_cl) |
e51dfa5a AU |
1473 | return 0; |
1474 | ||
46978ada AU |
1475 | /* HW currently supports only one pending read */ |
1476 | if (cl->rx_flow_ctrl_creds) | |
1477 | return -EBUSY; | |
1478 | ||
3030dc05 | 1479 | cb = mei_cl_enqueue_ctrl_wr_cb(cl, length, MEI_FOP_READ, fp); |
1df629ef AU |
1480 | if (!cb) |
1481 | return -ENOMEM; | |
1482 | ||
2bf94cab | 1483 | rets = pm_runtime_get(dev->dev); |
04bb139a | 1484 | if (rets < 0 && rets != -EINPROGRESS) { |
2bf94cab | 1485 | pm_runtime_put_noidle(dev->dev); |
04bb139a | 1486 | cl_err(dev, cl, "rpm: get failed %d\n", rets); |
1df629ef | 1487 | goto nortpm; |
04bb139a TW |
1488 | } |
1489 | ||
46978ada | 1490 | rets = 0; |
6aae48ff | 1491 | if (mei_hbuf_acquire(dev)) { |
86113500 AU |
1492 | rets = mei_hbm_cl_flow_control_req(dev, cl); |
1493 | if (rets < 0) | |
04bb139a | 1494 | goto out; |
04bb139a | 1495 | |
46978ada | 1496 | list_move_tail(&cb->list, &cl->rd_pending); |
ab841160 | 1497 | } |
46978ada | 1498 | cl->rx_flow_ctrl_creds++; |
accb884b | 1499 | |
04bb139a TW |
1500 | out: |
1501 | cl_dbg(dev, cl, "rpm: autosuspend\n"); | |
2bf94cab TW |
1502 | pm_runtime_mark_last_busy(dev->dev); |
1503 | pm_runtime_put_autosuspend(dev->dev); | |
1df629ef | 1504 | nortpm: |
04bb139a TW |
1505 | if (rets) |
1506 | mei_io_cb_free(cb); | |
1507 | ||
ab841160 OW |
1508 | return rets; |
1509 | } | |
1510 | ||
21767546 | 1511 | /** |
9d098192 | 1512 | * mei_cl_irq_write - write a message to device |
21767546 TW |
1513 | * from the interrupt thread context |
1514 | * | |
1515 | * @cl: client | |
1516 | * @cb: callback block. | |
21767546 TW |
1517 | * @cmpl_list: complete list. |
1518 | * | |
a8605ea2 | 1519 | * Return: 0, OK; otherwise error. |
21767546 | 1520 | */ |
9d098192 TW |
1521 | int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb, |
1522 | struct mei_cl_cb *cmpl_list) | |
21767546 | 1523 | { |
136698e5 TW |
1524 | struct mei_device *dev; |
1525 | struct mei_msg_data *buf; | |
21767546 | 1526 | struct mei_msg_hdr mei_hdr; |
136698e5 TW |
1527 | size_t len; |
1528 | u32 msg_slots; | |
9d098192 | 1529 | int slots; |
2ebf8c94 | 1530 | int rets; |
b8b73035 | 1531 | bool first_chunk; |
21767546 | 1532 | |
136698e5 TW |
1533 | if (WARN_ON(!cl || !cl->dev)) |
1534 | return -ENODEV; | |
1535 | ||
1536 | dev = cl->dev; | |
1537 | ||
5db7514d | 1538 | buf = &cb->buf; |
136698e5 | 1539 | |
b8b73035 AU |
1540 | first_chunk = cb->buf_idx == 0; |
1541 | ||
4034b81b | 1542 | rets = first_chunk ? mei_cl_tx_flow_ctrl_creds(cl) : 1; |
136698e5 | 1543 | if (rets < 0) |
e09ee853 | 1544 | goto err; |
136698e5 TW |
1545 | |
1546 | if (rets == 0) { | |
04bb139a | 1547 | cl_dbg(dev, cl, "No flow control credentials: not sending.\n"); |
136698e5 TW |
1548 | return 0; |
1549 | } | |
1550 | ||
9d098192 | 1551 | slots = mei_hbuf_empty_slots(dev); |
136698e5 TW |
1552 | len = buf->size - cb->buf_idx; |
1553 | msg_slots = mei_data2slots(len); | |
1554 | ||
1df629ef | 1555 | mei_hdr.host_addr = mei_cl_host_addr(cl); |
d49ed64a | 1556 | mei_hdr.me_addr = mei_cl_me_id(cl); |
21767546 | 1557 | mei_hdr.reserved = 0; |
479327fc | 1558 | mei_hdr.internal = cb->internal; |
21767546 | 1559 | |
9d098192 | 1560 | if (slots >= msg_slots) { |
21767546 TW |
1561 | mei_hdr.length = len; |
1562 | mei_hdr.msg_complete = 1; | |
1563 | /* Split the message only if we can write the whole host buffer */ | |
9d098192 TW |
1564 | } else if (slots == dev->hbuf_depth) { |
1565 | msg_slots = slots; | |
1566 | len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr); | |
21767546 TW |
1567 | mei_hdr.length = len; |
1568 | mei_hdr.msg_complete = 0; | |
1569 | } else { | |
1570 | /* wait for next time the host buffer is empty */ | |
1571 | return 0; | |
1572 | } | |
1573 | ||
35bf7692 | 1574 | cl_dbg(dev, cl, "buf: size = %zu idx = %zu\n", |
5db7514d | 1575 | cb->buf.size, cb->buf_idx); |
21767546 | 1576 | |
136698e5 | 1577 | rets = mei_write_message(dev, &mei_hdr, buf->data + cb->buf_idx); |
e09ee853 AU |
1578 | if (rets) |
1579 | goto err; | |
21767546 TW |
1580 | |
1581 | cl->status = 0; | |
4dfaa9f7 | 1582 | cl->writing_state = MEI_WRITING; |
21767546 | 1583 | cb->buf_idx += mei_hdr.length; |
8660172e | 1584 | cb->completed = mei_hdr.msg_complete == 1; |
4dfaa9f7 | 1585 | |
b8b73035 | 1586 | if (first_chunk) { |
e09ee853 AU |
1587 | if (mei_cl_tx_flow_ctrl_creds_reduce(cl)) { |
1588 | rets = -EIO; | |
1589 | goto err; | |
1590 | } | |
21767546 TW |
1591 | } |
1592 | ||
b8b73035 AU |
1593 | if (mei_hdr.msg_complete) |
1594 | list_move_tail(&cb->list, &dev->write_waiting_list.list); | |
1595 | ||
21767546 | 1596 | return 0; |
e09ee853 AU |
1597 | |
1598 | err: | |
1599 | cl->status = rets; | |
1600 | list_move_tail(&cb->list, &cmpl_list->list); | |
1601 | return rets; | |
21767546 TW |
1602 | } |
1603 | ||
4234a6de TW |
1604 | /** |
1605 | * mei_cl_write - submit a write cb to mei device | |
a8605ea2 | 1606 | * assumes device_lock is locked |
4234a6de TW |
1607 | * |
1608 | * @cl: host client | |
a8605ea2 | 1609 | * @cb: write callback with filled data |
4234a6de | 1610 | * |
a8605ea2 | 1611 | * Return: number of bytes sent on success, <0 on failure. |
4234a6de | 1612 | */ |
e0cb6b2f | 1613 | int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb) |
4234a6de TW |
1614 | { |
1615 | struct mei_device *dev; | |
1616 | struct mei_msg_data *buf; | |
1617 | struct mei_msg_hdr mei_hdr; | |
23253c31 | 1618 | int size; |
4234a6de | 1619 | int rets; |
e0cb6b2f | 1620 | bool blocking; |
4234a6de TW |
1621 | |
1622 | if (WARN_ON(!cl || !cl->dev)) | |
1623 | return -ENODEV; | |
1624 | ||
1625 | if (WARN_ON(!cb)) | |
1626 | return -EINVAL; | |
1627 | ||
1628 | dev = cl->dev; | |
1629 | ||
5db7514d | 1630 | buf = &cb->buf; |
23253c31 | 1631 | size = buf->size; |
e0cb6b2f | 1632 | blocking = cb->blocking; |
4234a6de | 1633 | |
23253c31 | 1634 | cl_dbg(dev, cl, "size=%d\n", size); |
4234a6de | 1635 | |
2bf94cab | 1636 | rets = pm_runtime_get(dev->dev); |
04bb139a | 1637 | if (rets < 0 && rets != -EINPROGRESS) { |
2bf94cab | 1638 | pm_runtime_put_noidle(dev->dev); |
04bb139a | 1639 | cl_err(dev, cl, "rpm: get failed %d\n", rets); |
6cbb097f | 1640 | goto free; |
04bb139a | 1641 | } |
4234a6de | 1642 | |
6aae48ff TW |
1643 | cb->buf_idx = 0; |
1644 | cl->writing_state = MEI_IDLE; | |
1645 | ||
1df629ef | 1646 | mei_hdr.host_addr = mei_cl_host_addr(cl); |
d49ed64a | 1647 | mei_hdr.me_addr = mei_cl_me_id(cl); |
6aae48ff TW |
1648 | mei_hdr.reserved = 0; |
1649 | mei_hdr.msg_complete = 0; | |
1650 | mei_hdr.internal = cb->internal; | |
4234a6de | 1651 | |
4034b81b | 1652 | rets = mei_cl_tx_flow_ctrl_creds(cl); |
4234a6de TW |
1653 | if (rets < 0) |
1654 | goto err; | |
1655 | ||
6aae48ff TW |
1656 | if (rets == 0) { |
1657 | cl_dbg(dev, cl, "No flow control credentials: not sending.\n"); | |
23253c31 | 1658 | rets = size; |
6aae48ff TW |
1659 | goto out; |
1660 | } | |
1661 | if (!mei_hbuf_acquire(dev)) { | |
1662 | cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n"); | |
23253c31 | 1663 | rets = size; |
4234a6de TW |
1664 | goto out; |
1665 | } | |
4234a6de TW |
1666 | |
1667 | /* Check for a maximum length */ | |
23253c31 | 1668 | if (size > mei_hbuf_max_len(dev)) { |
4234a6de TW |
1669 | mei_hdr.length = mei_hbuf_max_len(dev); |
1670 | mei_hdr.msg_complete = 0; | |
1671 | } else { | |
23253c31 | 1672 | mei_hdr.length = size; |
4234a6de TW |
1673 | mei_hdr.msg_complete = 1; |
1674 | } | |
1675 | ||
2ebf8c94 TW |
1676 | rets = mei_write_message(dev, &mei_hdr, buf->data); |
1677 | if (rets) | |
4234a6de | 1678 | goto err; |
4234a6de | 1679 | |
4034b81b | 1680 | rets = mei_cl_tx_flow_ctrl_creds_reduce(cl); |
b8b73035 AU |
1681 | if (rets) |
1682 | goto err; | |
1683 | ||
4234a6de TW |
1684 | cl->writing_state = MEI_WRITING; |
1685 | cb->buf_idx = mei_hdr.length; | |
8660172e | 1686 | cb->completed = mei_hdr.msg_complete == 1; |
4234a6de | 1687 | |
4234a6de | 1688 | out: |
b8b73035 | 1689 | if (mei_hdr.msg_complete) |
4234a6de | 1690 | list_add_tail(&cb->list, &dev->write_waiting_list.list); |
b8b73035 | 1691 | else |
4234a6de | 1692 | list_add_tail(&cb->list, &dev->write_list.list); |
4234a6de | 1693 | |
23253c31 | 1694 | cb = NULL; |
4234a6de TW |
1695 | if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) { |
1696 | ||
1697 | mutex_unlock(&dev->device_lock); | |
7ca96aa2 | 1698 | rets = wait_event_interruptible(cl->tx_wait, |
0faf6a3b AU |
1699 | cl->writing_state == MEI_WRITE_COMPLETE || |
1700 | (!mei_cl_is_connected(cl))); | |
4234a6de | 1701 | mutex_lock(&dev->device_lock); |
7ca96aa2 AU |
1702 | /* wait_event_interruptible returns -ERESTARTSYS */ |
1703 | if (rets) { | |
1704 | if (signal_pending(current)) | |
1705 | rets = -EINTR; | |
1706 | goto err; | |
1707 | } | |
0faf6a3b AU |
1708 | if (cl->writing_state != MEI_WRITE_COMPLETE) { |
1709 | rets = -EFAULT; | |
1710 | goto err; | |
1711 | } | |
4234a6de | 1712 | } |
7ca96aa2 | 1713 | |
23253c31 | 1714 | rets = size; |
4234a6de | 1715 | err: |
04bb139a | 1716 | cl_dbg(dev, cl, "rpm: autosuspend\n"); |
2bf94cab TW |
1717 | pm_runtime_mark_last_busy(dev->dev); |
1718 | pm_runtime_put_autosuspend(dev->dev); | |
6cbb097f AU |
1719 | free: |
1720 | mei_io_cb_free(cb); | |
04bb139a | 1721 | |
4234a6de TW |
1722 | return rets; |
1723 | } | |
1724 | ||
1725 | ||
db086fa9 TW |
1726 | /** |
1727 | * mei_cl_complete - processes completed operation for a client | |
1728 | * | |
1729 | * @cl: private data of the file object. | |
1730 | * @cb: callback block. | |
1731 | */ | |
1732 | void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb) | |
1733 | { | |
a1809d38 AU |
1734 | struct mei_device *dev = cl->dev; |
1735 | ||
3c666182 TW |
1736 | switch (cb->fop_type) { |
1737 | case MEI_FOP_WRITE: | |
db086fa9 | 1738 | mei_io_cb_free(cb); |
db086fa9 | 1739 | cl->writing_state = MEI_WRITE_COMPLETE; |
a1809d38 | 1740 | if (waitqueue_active(&cl->tx_wait)) { |
db086fa9 | 1741 | wake_up_interruptible(&cl->tx_wait); |
a1809d38 AU |
1742 | } else { |
1743 | pm_runtime_mark_last_busy(dev->dev); | |
1744 | pm_request_autosuspend(dev->dev); | |
1745 | } | |
3c666182 | 1746 | break; |
db086fa9 | 1747 | |
3c666182 | 1748 | case MEI_FOP_READ: |
a9bed610 | 1749 | list_add_tail(&cb->list, &cl->rd_completed); |
46978ada AU |
1750 | if (!mei_cl_is_fixed_address(cl) && |
1751 | !WARN_ON(!cl->rx_flow_ctrl_creds)) | |
1752 | cl->rx_flow_ctrl_creds--; | |
a1f9ae2b TW |
1753 | if (!mei_cl_bus_rx_event(cl)) |
1754 | wake_up_interruptible(&cl->rx_wait); | |
3c666182 TW |
1755 | break; |
1756 | ||
1757 | case MEI_FOP_CONNECT: | |
1758 | case MEI_FOP_DISCONNECT: | |
51678ccb TW |
1759 | case MEI_FOP_NOTIFY_STOP: |
1760 | case MEI_FOP_NOTIFY_START: | |
3c666182 TW |
1761 | if (waitqueue_active(&cl->wait)) |
1762 | wake_up(&cl->wait); | |
db086fa9 | 1763 | |
6a8d648c AU |
1764 | break; |
1765 | case MEI_FOP_DISCONNECT_RSP: | |
1766 | mei_io_cb_free(cb); | |
1767 | mei_cl_set_disconnected(cl); | |
3c666182 TW |
1768 | break; |
1769 | default: | |
1770 | BUG_ON(0); | |
db086fa9 TW |
1771 | } |
1772 | } | |
1773 | ||
4234a6de | 1774 | |
074b4c01 TW |
1775 | /** |
1776 | * mei_cl_all_disconnect - disconnect forcefully all connected clients | |
1777 | * | |
a8605ea2 | 1778 | * @dev: mei device |
074b4c01 | 1779 | */ |
074b4c01 TW |
1780 | void mei_cl_all_disconnect(struct mei_device *dev) |
1781 | { | |
31f88f57 | 1782 | struct mei_cl *cl; |
074b4c01 | 1783 | |
3c666182 TW |
1784 | list_for_each_entry(cl, &dev->file_list, link) |
1785 | mei_cl_set_disconnected(cl); | |
074b4c01 | 1786 | } |