1 /*
2 *
3 * Intel Management Engine Interface (Intel MEI) Linux driver
4 * Copyright (c) 2003-2012, Intel Corporation.
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
17 #include <linux/pci.h>
18 #include <linux/sched.h>
19 #include <linux/wait.h>
20 #include <linux/delay.h>
21
22 #include "mei_dev.h"
23 #include "hw.h"
24 #include "interface.h"
25 #include "mei.h"
26
27 const uuid_le mei_amthi_guid = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d, 0xac,
28 0xa8, 0x46, 0xe0, 0xff, 0x65,
29 0x81, 0x4c);
30
31 /**
32 * mei_io_list_init - Sets up a queue list.
33 *
34 * @list: An instance io list structure
35 * @dev: the device structure
36 */
mei_io_list_init(struct mei_io_list * list)37 void mei_io_list_init(struct mei_io_list *list)
38 {
39 /* initialize our queue list */
40 INIT_LIST_HEAD(&list->mei_cb.cb_list);
41 }
42
43 /**
44 * mei_io_list_flush - removes list entry belonging to cl.
45 *
46 * @list: An instance of our list structure
47 * @cl: private data of the file object
48 */
mei_io_list_flush(struct mei_io_list * list,struct mei_cl * cl)49 void mei_io_list_flush(struct mei_io_list *list, struct mei_cl *cl)
50 {
51 struct mei_cl_cb *pos;
52 struct mei_cl_cb *next;
53
54 list_for_each_entry_safe(pos, next, &list->mei_cb.cb_list, cb_list) {
55 if (pos->file_private) {
56 struct mei_cl *cl_tmp;
57 cl_tmp = (struct mei_cl *)pos->file_private;
58 if (mei_cl_cmp_id(cl, cl_tmp))
59 list_del(&pos->cb_list);
60 }
61 }
62 }
63 /**
64 * mei_cl_flush_queues - flushes queue lists belonging to cl.
65 *
66 * @dev: the device structure
67 * @cl: private data of the file object
68 */
mei_cl_flush_queues(struct mei_cl * cl)69 int mei_cl_flush_queues(struct mei_cl *cl)
70 {
71 if (!cl || !cl->dev)
72 return -EINVAL;
73
74 dev_dbg(&cl->dev->pdev->dev, "remove list entry belonging to cl\n");
75 mei_io_list_flush(&cl->dev->read_list, cl);
76 mei_io_list_flush(&cl->dev->write_list, cl);
77 mei_io_list_flush(&cl->dev->write_waiting_list, cl);
78 mei_io_list_flush(&cl->dev->ctrl_wr_list, cl);
79 mei_io_list_flush(&cl->dev->ctrl_rd_list, cl);
80 mei_io_list_flush(&cl->dev->amthi_cmd_list, cl);
81 mei_io_list_flush(&cl->dev->amthi_read_complete_list, cl);
82 return 0;
83 }
84
85
86
87 /**
88 * mei_reset_iamthif_params - initializes mei device iamthif
89 *
90 * @dev: the device structure
91 */
mei_reset_iamthif_params(struct mei_device * dev)92 static void mei_reset_iamthif_params(struct mei_device *dev)
93 {
94 /* reset iamthif parameters. */
95 dev->iamthif_current_cb = NULL;
96 dev->iamthif_msg_buf_size = 0;
97 dev->iamthif_msg_buf_index = 0;
98 dev->iamthif_canceled = false;
99 dev->iamthif_ioctl = false;
100 dev->iamthif_state = MEI_IAMTHIF_IDLE;
101 dev->iamthif_timer = 0;
102 }
103
104 /**
105 * init_mei_device - allocates and initializes the mei device structure
106 *
107 * @pdev: The pci device structure
108 *
109 * returns The mei_device_device pointer on success, NULL on failure.
110 */
mei_device_init(struct pci_dev * pdev)111 struct mei_device *mei_device_init(struct pci_dev *pdev)
112 {
113 struct mei_device *dev;
114
115 dev = kzalloc(sizeof(struct mei_device), GFP_KERNEL);
116 if (!dev)
117 return NULL;
118
119 /* setup our list array */
120 INIT_LIST_HEAD(&dev->file_list);
121 INIT_LIST_HEAD(&dev->wd_cl.link);
122 INIT_LIST_HEAD(&dev->iamthif_cl.link);
123 mutex_init(&dev->device_lock);
124 init_waitqueue_head(&dev->wait_recvd_msg);
125 init_waitqueue_head(&dev->wait_stop_wd);
126 dev->mei_state = MEI_INITIALIZING;
127 dev->iamthif_state = MEI_IAMTHIF_IDLE;
128 dev->wd_interface_reg = false;
129
130
131 mei_io_list_init(&dev->read_list);
132 mei_io_list_init(&dev->write_list);
133 mei_io_list_init(&dev->write_waiting_list);
134 mei_io_list_init(&dev->ctrl_wr_list);
135 mei_io_list_init(&dev->ctrl_rd_list);
136 mei_io_list_init(&dev->amthi_cmd_list);
137 mei_io_list_init(&dev->amthi_read_complete_list);
138 dev->pdev = pdev;
139 return dev;
140 }
141
142 /**
143 * mei_hw_init - initializes host and fw to start work.
144 *
145 * @dev: the device structure
146 *
147 * returns 0 on success, <0 on failure.
148 */
mei_hw_init(struct mei_device * dev)149 int mei_hw_init(struct mei_device *dev)
150 {
151 int err = 0;
152 int ret;
153
154 mutex_lock(&dev->device_lock);
155
156 dev->host_hw_state = mei_hcsr_read(dev);
157 dev->me_hw_state = mei_mecsr_read(dev);
158 dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, mestate = 0x%08x.\n",
159 dev->host_hw_state, dev->me_hw_state);
160
161 /* acknowledge interrupt and stop interupts */
162 if ((dev->host_hw_state & H_IS) == H_IS)
163 mei_reg_write(dev, H_CSR, dev->host_hw_state);
164
165 dev->recvd_msg = false;
166 dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
167
168 mei_reset(dev, 1);
169
170 dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
171 dev->host_hw_state, dev->me_hw_state);
172
173 /* wait for ME to turn on ME_RDY */
174 if (!dev->recvd_msg) {
175 mutex_unlock(&dev->device_lock);
176 err = wait_event_interruptible_timeout(dev->wait_recvd_msg,
177 dev->recvd_msg, MEI_INTEROP_TIMEOUT);
178 mutex_lock(&dev->device_lock);
179 }
180
181 if (err <= 0 && !dev->recvd_msg) {
182 dev->mei_state = MEI_DISABLED;
183 dev_dbg(&dev->pdev->dev,
184 "wait_event_interruptible_timeout failed"
185 "on wait for ME to turn on ME_RDY.\n");
186 ret = -ENODEV;
187 goto out;
188 }
189
190 if (!(((dev->host_hw_state & H_RDY) == H_RDY) &&
191 ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA))) {
192 dev->mei_state = MEI_DISABLED;
193 dev_dbg(&dev->pdev->dev,
194 "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
195 dev->host_hw_state, dev->me_hw_state);
196
197 if (!(dev->host_hw_state & H_RDY))
198 dev_dbg(&dev->pdev->dev, "host turn off H_RDY.\n");
199
200 if (!(dev->me_hw_state & ME_RDY_HRA))
201 dev_dbg(&dev->pdev->dev, "ME turn off ME_RDY.\n");
202
203 printk(KERN_ERR "mei: link layer initialization failed.\n");
204 ret = -ENODEV;
205 goto out;
206 }
207
208 if (dev->version.major_version != HBM_MAJOR_VERSION ||
209 dev->version.minor_version != HBM_MINOR_VERSION) {
210 dev_dbg(&dev->pdev->dev, "MEI start failed.\n");
211 ret = -ENODEV;
212 goto out;
213 }
214
215 dev->recvd_msg = false;
216 dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
217 dev->host_hw_state, dev->me_hw_state);
218 dev_dbg(&dev->pdev->dev, "ME turn on ME_RDY and host turn on H_RDY.\n");
219 dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
220 dev_dbg(&dev->pdev->dev, "MEI start success.\n");
221 ret = 0;
222
223 out:
224 mutex_unlock(&dev->device_lock);
225 return ret;
226 }
227
228 /**
229 * mei_hw_reset - resets fw via mei csr register.
230 *
231 * @dev: the device structure
232 * @interrupts_enabled: if interrupt should be enabled after reset.
233 */
mei_hw_reset(struct mei_device * dev,int interrupts_enabled)234 static void mei_hw_reset(struct mei_device *dev, int interrupts_enabled)
235 {
236 dev->host_hw_state |= (H_RST | H_IG);
237
238 if (interrupts_enabled)
239 mei_enable_interrupts(dev);
240 else
241 mei_disable_interrupts(dev);
242 }
243
244 /**
245 * mei_reset - resets host and fw.
246 *
247 * @dev: the device structure
248 * @interrupts_enabled: if interrupt should be enabled after reset.
249 */
mei_reset(struct mei_device * dev,int interrupts_enabled)250 void mei_reset(struct mei_device *dev, int interrupts_enabled)
251 {
252 struct mei_cl *cl_pos = NULL;
253 struct mei_cl *cl_next = NULL;
254 struct mei_cl_cb *cb_pos = NULL;
255 struct mei_cl_cb *cb_next = NULL;
256 bool unexpected;
257
258 if (dev->mei_state == MEI_RECOVERING_FROM_RESET) {
259 dev->need_reset = true;
260 return;
261 }
262
263 unexpected = (dev->mei_state != MEI_INITIALIZING &&
264 dev->mei_state != MEI_DISABLED &&
265 dev->mei_state != MEI_POWER_DOWN &&
266 dev->mei_state != MEI_POWER_UP);
267
268 dev->host_hw_state = mei_hcsr_read(dev);
269
270 dev_dbg(&dev->pdev->dev, "before reset host_hw_state = 0x%08x.\n",
271 dev->host_hw_state);
272
273 mei_hw_reset(dev, interrupts_enabled);
274
275 dev->host_hw_state &= ~H_RST;
276 dev->host_hw_state |= H_IG;
277
278 mei_hcsr_set(dev);
279
280 dev_dbg(&dev->pdev->dev, "currently saved host_hw_state = 0x%08x.\n",
281 dev->host_hw_state);
282
283 dev->need_reset = false;
284
285 if (dev->mei_state != MEI_INITIALIZING) {
286 if (dev->mei_state != MEI_DISABLED &&
287 dev->mei_state != MEI_POWER_DOWN)
288 dev->mei_state = MEI_RESETING;
289
290 list_for_each_entry_safe(cl_pos,
291 cl_next, &dev->file_list, link) {
292 cl_pos->state = MEI_FILE_DISCONNECTED;
293 cl_pos->mei_flow_ctrl_creds = 0;
294 cl_pos->read_cb = NULL;
295 cl_pos->timer_count = 0;
296 }
297 /* remove entry if already in list */
298 dev_dbg(&dev->pdev->dev, "list del iamthif and wd file list.\n");
299 mei_remove_client_from_file_list(dev,
300 dev->wd_cl.host_client_id);
301
302 mei_remove_client_from_file_list(dev,
303 dev->iamthif_cl.host_client_id);
304
305 mei_reset_iamthif_params(dev);
306 dev->wd_due_counter = 0;
307 dev->extra_write_index = 0;
308 }
309
310 dev->me_clients_num = 0;
311 dev->rd_msg_hdr = 0;
312 dev->stop = false;
313 dev->wd_pending = false;
314
315 /* update the state of the registers after reset */
316 dev->host_hw_state = mei_hcsr_read(dev);
317 dev->me_hw_state = mei_mecsr_read(dev);
318
319 dev_dbg(&dev->pdev->dev, "after reset host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
320 dev->host_hw_state, dev->me_hw_state);
321
322 if (unexpected)
323 dev_warn(&dev->pdev->dev, "unexpected reset.\n");
324
325 /* Wake up all readings so they can be interrupted */
326 list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
327 if (waitqueue_active(&cl_pos->rx_wait)) {
328 dev_dbg(&dev->pdev->dev, "Waking up client!\n");
329 wake_up_interruptible(&cl_pos->rx_wait);
330 }
331 }
332 /* remove all waiting requests */
333 list_for_each_entry_safe(cb_pos, cb_next,
334 &dev->write_list.mei_cb.cb_list, cb_list) {
335 list_del(&cb_pos->cb_list);
336 mei_free_cb_private(cb_pos);
337 }
338 }
339
340
341
342 /**
343 * host_start_message - mei host sends start message.
344 *
345 * @dev: the device structure
346 *
347 * returns none.
348 */
mei_host_start_message(struct mei_device * dev)349 void mei_host_start_message(struct mei_device *dev)
350 {
351 struct mei_msg_hdr *mei_hdr;
352 struct hbm_host_version_request *host_start_req;
353
354 /* host start message */
355 mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
356 mei_hdr->host_addr = 0;
357 mei_hdr->me_addr = 0;
358 mei_hdr->length = sizeof(struct hbm_host_version_request);
359 mei_hdr->msg_complete = 1;
360 mei_hdr->reserved = 0;
361
362 host_start_req =
363 (struct hbm_host_version_request *) &dev->wr_msg_buf[1];
364 memset(host_start_req, 0, sizeof(struct hbm_host_version_request));
365 host_start_req->hbm_cmd = HOST_START_REQ_CMD;
366 host_start_req->host_version.major_version = HBM_MAJOR_VERSION;
367 host_start_req->host_version.minor_version = HBM_MINOR_VERSION;
368 dev->recvd_msg = false;
369 if (mei_write_message(dev, mei_hdr, (unsigned char *)host_start_req,
370 mei_hdr->length)) {
371 dev_dbg(&dev->pdev->dev, "write send version message to FW fail.\n");
372 dev->mei_state = MEI_RESETING;
373 mei_reset(dev, 1);
374 }
375 dev->init_clients_state = MEI_START_MESSAGE;
376 dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
377 return ;
378 }
379
380 /**
381 * host_enum_clients_message - host sends enumeration client request message.
382 *
383 * @dev: the device structure
384 *
385 * returns none.
386 */
mei_host_enum_clients_message(struct mei_device * dev)387 void mei_host_enum_clients_message(struct mei_device *dev)
388 {
389 struct mei_msg_hdr *mei_hdr;
390 struct hbm_host_enum_request *host_enum_req;
391 mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
392 /* enumerate clients */
393 mei_hdr->host_addr = 0;
394 mei_hdr->me_addr = 0;
395 mei_hdr->length = sizeof(struct hbm_host_enum_request);
396 mei_hdr->msg_complete = 1;
397 mei_hdr->reserved = 0;
398
399 host_enum_req = (struct hbm_host_enum_request *) &dev->wr_msg_buf[1];
400 memset(host_enum_req, 0, sizeof(struct hbm_host_enum_request));
401 host_enum_req->hbm_cmd = HOST_ENUM_REQ_CMD;
402 if (mei_write_message(dev, mei_hdr, (unsigned char *)host_enum_req,
403 mei_hdr->length)) {
404 dev->mei_state = MEI_RESETING;
405 dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
406 mei_reset(dev, 1);
407 }
408 dev->init_clients_state = MEI_ENUM_CLIENTS_MESSAGE;
409 dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
410 return;
411 }
412
413
414 /**
415 * allocate_me_clients_storage - allocates storage for me clients
416 *
417 * @dev: the device structure
418 *
419 * returns none.
420 */
mei_allocate_me_clients_storage(struct mei_device * dev)421 void mei_allocate_me_clients_storage(struct mei_device *dev)
422 {
423 struct mei_me_client *clients;
424 int b;
425
426 /* count how many ME clients we have */
427 for_each_set_bit(b, dev->me_clients_map, MEI_CLIENTS_MAX)
428 dev->me_clients_num++;
429
430 if (dev->me_clients_num <= 0)
431 return ;
432
433
434 if (dev->me_clients != NULL) {
435 kfree(dev->me_clients);
436 dev->me_clients = NULL;
437 }
438 dev_dbg(&dev->pdev->dev, "memory allocation for ME clients size=%zd.\n",
439 dev->me_clients_num * sizeof(struct mei_me_client));
440 /* allocate storage for ME clients representation */
441 clients = kcalloc(dev->me_clients_num,
442 sizeof(struct mei_me_client), GFP_KERNEL);
443 if (!clients) {
444 dev_dbg(&dev->pdev->dev, "memory allocation for ME clients failed.\n");
445 dev->mei_state = MEI_RESETING;
446 mei_reset(dev, 1);
447 return ;
448 }
449 dev->me_clients = clients;
450 return ;
451 }
452 /**
453 * host_client_properties - reads properties for client
454 *
455 * @dev: the device structure
456 *
457 * returns:
458 * < 0 - Error.
459 * = 0 - no more clients.
460 * = 1 - still have clients to send properties request.
461 */
mei_host_client_properties(struct mei_device * dev)462 int mei_host_client_properties(struct mei_device *dev)
463 {
464 struct mei_msg_hdr *mei_header;
465 struct hbm_props_request *host_cli_req;
466 int b;
467 u8 client_num = dev->me_client_presentation_num;
468
469 b = dev->me_client_index;
470 b = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, b);
471 if (b < MEI_CLIENTS_MAX) {
472 dev->me_clients[client_num].client_id = b;
473 dev->me_clients[client_num].mei_flow_ctrl_creds = 0;
474 mei_header = (struct mei_msg_hdr *)&dev->wr_msg_buf[0];
475 mei_header->host_addr = 0;
476 mei_header->me_addr = 0;
477 mei_header->length = sizeof(struct hbm_props_request);
478 mei_header->msg_complete = 1;
479 mei_header->reserved = 0;
480
481 host_cli_req = (struct hbm_props_request *)&dev->wr_msg_buf[1];
482
483 memset(host_cli_req, 0, sizeof(struct hbm_props_request));
484
485 host_cli_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
486 host_cli_req->address = b;
487
488 if (mei_write_message(dev, mei_header,
489 (unsigned char *)host_cli_req,
490 mei_header->length)) {
491 dev->mei_state = MEI_RESETING;
492 dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
493 mei_reset(dev, 1);
494 return -EIO;
495 }
496
497 dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
498 dev->me_client_index = b;
499 return 1;
500 }
501
502 return 0;
503 }
504
505 /**
506 * mei_init_file_private - initializes private file structure.
507 *
508 * @priv: private file structure to be initialized
509 * @file: the file structure
510 */
mei_cl_init(struct mei_cl * priv,struct mei_device * dev)511 void mei_cl_init(struct mei_cl *priv, struct mei_device *dev)
512 {
513 memset(priv, 0, sizeof(struct mei_cl));
514 init_waitqueue_head(&priv->wait);
515 init_waitqueue_head(&priv->rx_wait);
516 init_waitqueue_head(&priv->tx_wait);
517 INIT_LIST_HEAD(&priv->link);
518 priv->reading_state = MEI_IDLE;
519 priv->writing_state = MEI_IDLE;
520 priv->dev = dev;
521 }
522
mei_find_me_client_index(const struct mei_device * dev,uuid_le cuuid)523 int mei_find_me_client_index(const struct mei_device *dev, uuid_le cuuid)
524 {
525 int i, res = -1;
526
527 for (i = 0; i < dev->me_clients_num; ++i)
528 if (uuid_le_cmp(cuuid,
529 dev->me_clients[i].props.protocol_name) == 0) {
530 res = i;
531 break;
532 }
533
534 return res;
535 }
536
537
538 /**
539 * mei_find_me_client_update_filext - searches for ME client guid
540 * sets client_id in mei_file_private if found
541 * @dev: the device structure
542 * @priv: private file structure to set client_id in
543 * @cguid: searched guid of ME client
544 * @client_id: id of host client to be set in file private structure
545 *
546 * returns ME client index
547 */
mei_find_me_client_update_filext(struct mei_device * dev,struct mei_cl * priv,const uuid_le * cguid,u8 client_id)548 u8 mei_find_me_client_update_filext(struct mei_device *dev, struct mei_cl *priv,
549 const uuid_le *cguid, u8 client_id)
550 {
551 int i;
552
553 if (!dev || !priv || !cguid)
554 return 0;
555
556 /* check for valid client id */
557 i = mei_find_me_client_index(dev, *cguid);
558 if (i >= 0) {
559 priv->me_client_id = dev->me_clients[i].client_id;
560 priv->state = MEI_FILE_CONNECTING;
561 priv->host_client_id = client_id;
562
563 list_add_tail(&priv->link, &dev->file_list);
564 return (u8)i;
565 }
566
567 return 0;
568 }
569
570 /**
571 * host_init_iamthif - mei initialization iamthif client.
572 *
573 * @dev: the device structure
574 *
575 */
mei_host_init_iamthif(struct mei_device * dev)576 void mei_host_init_iamthif(struct mei_device *dev)
577 {
578 u8 i;
579 unsigned char *msg_buf;
580
581 mei_cl_init(&dev->iamthif_cl, dev);
582 dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
583
584 /* find ME amthi client */
585 i = mei_find_me_client_update_filext(dev, &dev->iamthif_cl,
586 &mei_amthi_guid, MEI_IAMTHIF_HOST_CLIENT_ID);
587 if (dev->iamthif_cl.state != MEI_FILE_CONNECTING) {
588 dev_dbg(&dev->pdev->dev, "failed to find iamthif client.\n");
589 return;
590 }
591
592 /* Assign iamthif_mtu to the value received from ME */
593
594 dev->iamthif_mtu = dev->me_clients[i].props.max_msg_length;
595 dev_dbg(&dev->pdev->dev, "IAMTHIF_MTU = %d\n",
596 dev->me_clients[i].props.max_msg_length);
597
598 kfree(dev->iamthif_msg_buf);
599 dev->iamthif_msg_buf = NULL;
600
601 /* allocate storage for ME message buffer */
602 msg_buf = kcalloc(dev->iamthif_mtu,
603 sizeof(unsigned char), GFP_KERNEL);
604 if (!msg_buf) {
605 dev_dbg(&dev->pdev->dev, "memory allocation for ME message buffer failed.\n");
606 return;
607 }
608
609 dev->iamthif_msg_buf = msg_buf;
610
611 if (mei_connect(dev, &dev->iamthif_cl)) {
612 dev_dbg(&dev->pdev->dev, "Failed to connect to AMTHI client\n");
613 dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
614 dev->iamthif_cl.host_client_id = 0;
615 } else {
616 dev->iamthif_cl.timer_count = CONNECT_TIMEOUT;
617 }
618 }
619
620 /**
621 * mei_alloc_file_private - allocates a private file structure and sets it up.
622 * @file: the file structure
623 *
624 * returns The allocated file or NULL on failure
625 */
mei_cl_allocate(struct mei_device * dev)626 struct mei_cl *mei_cl_allocate(struct mei_device *dev)
627 {
628 struct mei_cl *cl;
629
630 cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
631 if (!cl)
632 return NULL;
633
634 mei_cl_init(cl, dev);
635
636 return cl;
637 }
638
639
640
641 /**
642 * mei_disconnect_host_client - sends disconnect message to fw from host client.
643 *
644 * @dev: the device structure
645 * @cl: private data of the file object
646 *
647 * Locking: called under "dev->device_lock" lock
648 *
649 * returns 0 on success, <0 on failure.
650 */
mei_disconnect_host_client(struct mei_device * dev,struct mei_cl * cl)651 int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *cl)
652 {
653 int rets, err;
654 long timeout = 15; /* 15 seconds */
655 struct mei_cl_cb *cb;
656
657 if (!dev || !cl)
658 return -ENODEV;
659
660 if (cl->state != MEI_FILE_DISCONNECTING)
661 return 0;
662
663 cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
664 if (!cb)
665 return -ENOMEM;
666
667 INIT_LIST_HEAD(&cb->cb_list);
668 cb->file_private = cl;
669 cb->major_file_operations = MEI_CLOSE;
670 if (dev->mei_host_buffer_is_empty) {
671 dev->mei_host_buffer_is_empty = false;
672 if (mei_disconnect(dev, cl)) {
673 rets = -ENODEV;
674 dev_dbg(&dev->pdev->dev, "failed to call mei_disconnect.\n");
675 goto free;
676 }
677 mdelay(10); /* Wait for hardware disconnection ready */
678 list_add_tail(&cb->cb_list, &dev->ctrl_rd_list.mei_cb.cb_list);
679 } else {
680 dev_dbg(&dev->pdev->dev, "add disconnect cb to control write list\n");
681 list_add_tail(&cb->cb_list,
682 &dev->ctrl_wr_list.mei_cb.cb_list);
683 }
684 mutex_unlock(&dev->device_lock);
685
686 err = wait_event_timeout(dev->wait_recvd_msg,
687 (MEI_FILE_DISCONNECTED == cl->state),
688 timeout * HZ);
689
690 mutex_lock(&dev->device_lock);
691 if (MEI_FILE_DISCONNECTED == cl->state) {
692 rets = 0;
693 dev_dbg(&dev->pdev->dev, "successfully disconnected from FW client.\n");
694 } else {
695 rets = -ENODEV;
696 if (MEI_FILE_DISCONNECTED != cl->state)
697 dev_dbg(&dev->pdev->dev, "wrong status client disconnect.\n");
698
699 if (err)
700 dev_dbg(&dev->pdev->dev,
701 "wait failed disconnect err=%08x\n",
702 err);
703
704 dev_dbg(&dev->pdev->dev, "failed to disconnect from FW client.\n");
705 }
706
707 mei_io_list_flush(&dev->ctrl_rd_list, cl);
708 mei_io_list_flush(&dev->ctrl_wr_list, cl);
709 free:
710 mei_free_cb_private(cb);
711 return rets;
712 }
713
714 /**
715 * mei_remove_client_from_file_list -
716 * removes file private data from device file list
717 *
718 * @dev: the device structure
719 * @host_client_id: host client id to be removed
720 */
mei_remove_client_from_file_list(struct mei_device * dev,u8 host_client_id)721 void mei_remove_client_from_file_list(struct mei_device *dev,
722 u8 host_client_id)
723 {
724 struct mei_cl *cl_pos = NULL;
725 struct mei_cl *cl_next = NULL;
726 list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
727 if (host_client_id == cl_pos->host_client_id) {
728 dev_dbg(&dev->pdev->dev, "remove host client = %d, ME client = %d\n",
729 cl_pos->host_client_id,
730 cl_pos->me_client_id);
731 list_del_init(&cl_pos->link);
732 break;
733 }
734 }
735 }
736