aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/staging/mei/init.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/staging/mei/init.c')
-rw-r--r--drivers/staging/mei/init.c765
1 files changed, 765 insertions, 0 deletions
diff --git a/drivers/staging/mei/init.c b/drivers/staging/mei/init.c
new file mode 100644
index 00000000000..0fa8216fd0e
--- /dev/null
+++ b/drivers/staging/mei/init.c
@@ -0,0 +1,765 @@
1/*
2 *
3 * Intel Management Engine Interface (Intel MEI) Linux driver
4 * Copyright (c) 2003-2011, 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
27const 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 */
37void 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 list->status = 0;
42}
43
44/**
45 * mei_io_list_flush - removes list entry belonging to cl.
46 *
47 * @list: An instance of our list structure
48 * @cl: private data of the file object
49 */
50void mei_io_list_flush(struct mei_io_list *list, struct mei_cl *cl)
51{
52 struct mei_cl_cb *cb_pos = NULL;
53 struct mei_cl_cb *cb_next = NULL;
54
55 if (list->status != 0)
56 return;
57
58 if (list_empty(&list->mei_cb.cb_list))
59 return;
60
61 list_for_each_entry_safe(cb_pos, cb_next,
62 &list->mei_cb.cb_list, cb_list) {
63 if (cb_pos) {
64 struct mei_cl *cl_tmp;
65 cl_tmp = (struct mei_cl *)cb_pos->file_private;
66 if (mei_cl_cmp_id(cl, cl_tmp))
67 list_del(&cb_pos->cb_list);
68 }
69 }
70}
71/**
72 * mei_cl_flush_queues - flushes queue lists belonging to cl.
73 *
74 * @dev: the device structure
75 * @cl: private data of the file object
76 */
77int mei_cl_flush_queues(struct mei_cl *cl)
78{
79 if (!cl || !cl->dev)
80 return -EINVAL;
81
82 dev_dbg(&cl->dev->pdev->dev, "remove list entry belonging to cl\n");
83 mei_io_list_flush(&cl->dev->read_list, cl);
84 mei_io_list_flush(&cl->dev->write_list, cl);
85 mei_io_list_flush(&cl->dev->write_waiting_list, cl);
86 mei_io_list_flush(&cl->dev->ctrl_wr_list, cl);
87 mei_io_list_flush(&cl->dev->ctrl_rd_list, cl);
88 mei_io_list_flush(&cl->dev->amthi_cmd_list, cl);
89 mei_io_list_flush(&cl->dev->amthi_read_complete_list, cl);
90 return 0;
91}
92
93
94
95/**
96 * mei_reset_iamthif_params - initializes mei device iamthif
97 *
98 * @dev: the device structure
99 */
100static void mei_reset_iamthif_params(struct mei_device *dev)
101{
102 /* reset iamthif parameters. */
103 dev->iamthif_current_cb = NULL;
104 dev->iamthif_msg_buf_size = 0;
105 dev->iamthif_msg_buf_index = 0;
106 dev->iamthif_canceled = false;
107 dev->iamthif_ioctl = false;
108 dev->iamthif_state = MEI_IAMTHIF_IDLE;
109 dev->iamthif_timer = 0;
110}
111
112/**
113 * init_mei_device - allocates and initializes the mei device structure
114 *
115 * @pdev: The pci device structure
116 *
117 * returns The mei_device_device pointer on success, NULL on failure.
118 */
119struct mei_device *mei_device_init(struct pci_dev *pdev)
120{
121 struct mei_device *dev;
122
123 dev = kzalloc(sizeof(struct mei_device), GFP_KERNEL);
124 if (!dev)
125 return NULL;
126
127 /* setup our list array */
128 INIT_LIST_HEAD(&dev->file_list);
129 INIT_LIST_HEAD(&dev->wd_cl.link);
130 INIT_LIST_HEAD(&dev->iamthif_cl.link);
131 mutex_init(&dev->device_lock);
132 init_waitqueue_head(&dev->wait_recvd_msg);
133 init_waitqueue_head(&dev->wait_stop_wd);
134 dev->mei_state = MEI_INITIALIZING;
135 dev->iamthif_state = MEI_IAMTHIF_IDLE;
136
137
138 mei_io_list_init(&dev->read_list);
139 mei_io_list_init(&dev->write_list);
140 mei_io_list_init(&dev->write_waiting_list);
141 mei_io_list_init(&dev->ctrl_wr_list);
142 mei_io_list_init(&dev->ctrl_rd_list);
143 mei_io_list_init(&dev->amthi_cmd_list);
144 mei_io_list_init(&dev->amthi_read_complete_list);
145 dev->pdev = pdev;
146 return dev;
147}
148
149/**
150 * mei_hw_init - initializes host and fw to start work.
151 *
152 * @dev: the device structure
153 *
154 * returns 0 on success, <0 on failure.
155 */
156int mei_hw_init(struct mei_device *dev)
157{
158 int err = 0;
159 int ret;
160
161 mutex_lock(&dev->device_lock);
162
163 dev->host_hw_state = mei_hcsr_read(dev);
164 dev->me_hw_state = mei_mecsr_read(dev);
165 dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, mestate = 0x%08x.\n",
166 dev->host_hw_state, dev->me_hw_state);
167
168 /* acknowledge interrupt and stop interupts */
169 if ((dev->host_hw_state & H_IS) == H_IS)
170 mei_reg_write(dev, H_CSR, dev->host_hw_state);
171
172 dev->recvd_msg = false;
173 dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
174
175 mei_reset(dev, 1);
176
177 dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
178 dev->host_hw_state, dev->me_hw_state);
179
180 /* wait for ME to turn on ME_RDY */
181 if (!dev->recvd_msg) {
182 mutex_unlock(&dev->device_lock);
183 err = wait_event_interruptible_timeout(dev->wait_recvd_msg,
184 dev->recvd_msg, MEI_INTEROP_TIMEOUT);
185 mutex_lock(&dev->device_lock);
186 }
187
188 if (err <= 0 && !dev->recvd_msg) {
189 dev->mei_state = MEI_DISABLED;
190 dev_dbg(&dev->pdev->dev,
191 "wait_event_interruptible_timeout failed"
192 "on wait for ME to turn on ME_RDY.\n");
193 ret = -ENODEV;
194 goto out;
195 }
196
197 if (!(((dev->host_hw_state & H_RDY) == H_RDY) &&
198 ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA))) {
199 dev->mei_state = MEI_DISABLED;
200 dev_dbg(&dev->pdev->dev,
201 "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
202 dev->host_hw_state, dev->me_hw_state);
203
204 if (!(dev->host_hw_state & H_RDY))
205 dev_dbg(&dev->pdev->dev, "host turn off H_RDY.\n");
206
207 if (!(dev->me_hw_state & ME_RDY_HRA))
208 dev_dbg(&dev->pdev->dev, "ME turn off ME_RDY.\n");
209
210 printk(KERN_ERR "mei: link layer initialization failed.\n");
211 ret = -ENODEV;
212 goto out;
213 }
214
215 if (dev->version.major_version != HBM_MAJOR_VERSION ||
216 dev->version.minor_version != HBM_MINOR_VERSION) {
217 dev_dbg(&dev->pdev->dev, "MEI start failed.\n");
218 ret = -ENODEV;
219 goto out;
220 }
221
222 dev->recvd_msg = false;
223 dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
224 dev->host_hw_state, dev->me_hw_state);
225 dev_dbg(&dev->pdev->dev, "ME turn on ME_RDY and host turn on H_RDY.\n");
226 dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
227 dev_dbg(&dev->pdev->dev, "MEI start success.\n");
228 ret = 0;
229
230out:
231 mutex_unlock(&dev->device_lock);
232 return ret;
233}
234
235/**
236 * mei_hw_reset - resets fw via mei csr register.
237 *
238 * @dev: the device structure
239 * @interrupts_enabled: if interrupt should be enabled after reset.
240 */
241static void mei_hw_reset(struct mei_device *dev, int interrupts_enabled)
242{
243 dev->host_hw_state |= (H_RST | H_IG);
244
245 if (interrupts_enabled)
246 mei_enable_interrupts(dev);
247 else
248 mei_disable_interrupts(dev);
249}
250
251/**
252 * mei_reset - resets host and fw.
253 *
254 * @dev: the device structure
255 * @interrupts_enabled: if interrupt should be enabled after reset.
256 */
257void mei_reset(struct mei_device *dev, int interrupts_enabled)
258{
259 struct mei_cl *cl_pos = NULL;
260 struct mei_cl *cl_next = NULL;
261 struct mei_cl_cb *cb_pos = NULL;
262 struct mei_cl_cb *cb_next = NULL;
263 bool unexpected;
264
265 if (dev->mei_state == MEI_RECOVERING_FROM_RESET) {
266 dev->need_reset = true;
267 return;
268 }
269
270 unexpected = (dev->mei_state != MEI_INITIALIZING &&
271 dev->mei_state != MEI_DISABLED &&
272 dev->mei_state != MEI_POWER_DOWN &&
273 dev->mei_state != MEI_POWER_UP);
274
275 dev->host_hw_state = mei_hcsr_read(dev);
276
277 dev_dbg(&dev->pdev->dev, "before reset host_hw_state = 0x%08x.\n",
278 dev->host_hw_state);
279
280 mei_hw_reset(dev, interrupts_enabled);
281
282 dev->host_hw_state &= ~H_RST;
283 dev->host_hw_state |= H_IG;
284
285 mei_hcsr_set(dev);
286
287 dev_dbg(&dev->pdev->dev, "currently saved host_hw_state = 0x%08x.\n",
288 dev->host_hw_state);
289
290 dev->need_reset = false;
291
292 if (dev->mei_state != MEI_INITIALIZING) {
293 if (dev->mei_state != MEI_DISABLED &&
294 dev->mei_state != MEI_POWER_DOWN)
295 dev->mei_state = MEI_RESETING;
296
297 list_for_each_entry_safe(cl_pos,
298 cl_next, &dev->file_list, link) {
299 cl_pos->state = MEI_FILE_DISCONNECTED;
300 cl_pos->mei_flow_ctrl_creds = 0;
301 cl_pos->read_cb = NULL;
302 cl_pos->timer_count = 0;
303 }
304 /* remove entry if already in list */
305 dev_dbg(&dev->pdev->dev, "list del iamthif and wd file list.\n");
306 mei_remove_client_from_file_list(dev,
307 dev->wd_cl.host_client_id);
308
309 mei_remove_client_from_file_list(dev,
310 dev->iamthif_cl.host_client_id);
311
312 mei_reset_iamthif_params(dev);
313 dev->wd_due_counter = 0;
314 dev->extra_write_index = 0;
315 }
316
317 dev->me_clients_num = 0;
318 dev->rd_msg_hdr = 0;
319 dev->stop = false;
320 dev->wd_pending = false;
321
322 /* update the state of the registers after reset */
323 dev->host_hw_state = mei_hcsr_read(dev);
324 dev->me_hw_state = mei_mecsr_read(dev);
325
326 dev_dbg(&dev->pdev->dev, "after reset host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
327 dev->host_hw_state, dev->me_hw_state);
328
329 if (unexpected)
330 dev_warn(&dev->pdev->dev, "unexpected reset.\n");
331
332 /* Wake up all readings so they can be interrupted */
333 list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
334 if (waitqueue_active(&cl_pos->rx_wait)) {
335 dev_dbg(&dev->pdev->dev, "Waking up client!\n");
336 wake_up_interruptible(&cl_pos->rx_wait);
337 }
338 }
339 /* remove all waiting requests */
340 if (dev->write_list.status == 0 &&
341 !list_empty(&dev->write_list.mei_cb.cb_list)) {
342 list_for_each_entry_safe(cb_pos, cb_next,
343 &dev->write_list.mei_cb.cb_list, cb_list) {
344 if (cb_pos) {
345 list_del(&cb_pos->cb_list);
346 mei_free_cb_private(cb_pos);
347 cb_pos = NULL;
348 }
349 }
350 }
351}
352
353
354
355/**
356 * host_start_message - mei host sends start message.
357 *
358 * @dev: the device structure
359 *
360 * returns none.
361 */
362void mei_host_start_message(struct mei_device *dev)
363{
364 struct mei_msg_hdr *mei_hdr;
365 struct hbm_host_version_request *host_start_req;
366
367 /* host start message */
368 mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
369 mei_hdr->host_addr = 0;
370 mei_hdr->me_addr = 0;
371 mei_hdr->length = sizeof(struct hbm_host_version_request);
372 mei_hdr->msg_complete = 1;
373 mei_hdr->reserved = 0;
374
375 host_start_req =
376 (struct hbm_host_version_request *) &dev->wr_msg_buf[1];
377 memset(host_start_req, 0, sizeof(struct hbm_host_version_request));
378 host_start_req->cmd.cmd = HOST_START_REQ_CMD;
379 host_start_req->host_version.major_version = HBM_MAJOR_VERSION;
380 host_start_req->host_version.minor_version = HBM_MINOR_VERSION;
381 dev->recvd_msg = false;
382 if (!mei_write_message(dev, mei_hdr,
383 (unsigned char *) (host_start_req),
384 mei_hdr->length)) {
385 dev_dbg(&dev->pdev->dev, "write send version message to FW fail.\n");
386 dev->mei_state = MEI_RESETING;
387 mei_reset(dev, 1);
388 }
389 dev->init_clients_state = MEI_START_MESSAGE;
390 dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
391 return ;
392}
393
394/**
395 * host_enum_clients_message - host sends enumeration client request message.
396 *
397 * @dev: the device structure
398 *
399 * returns none.
400 */
401void mei_host_enum_clients_message(struct mei_device *dev)
402{
403 struct mei_msg_hdr *mei_hdr;
404 struct hbm_host_enum_request *host_enum_req;
405 mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
406 /* enumerate clients */
407 mei_hdr->host_addr = 0;
408 mei_hdr->me_addr = 0;
409 mei_hdr->length = sizeof(struct hbm_host_enum_request);
410 mei_hdr->msg_complete = 1;
411 mei_hdr->reserved = 0;
412
413 host_enum_req = (struct hbm_host_enum_request *) &dev->wr_msg_buf[1];
414 memset(host_enum_req, 0, sizeof(struct hbm_host_enum_request));
415 host_enum_req->cmd.cmd = HOST_ENUM_REQ_CMD;
416 if (!mei_write_message(dev, mei_hdr,
417 (unsigned char *) (host_enum_req),
418 mei_hdr->length)) {
419 dev->mei_state = MEI_RESETING;
420 dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
421 mei_reset(dev, 1);
422 }
423 dev->init_clients_state = MEI_ENUM_CLIENTS_MESSAGE;
424 dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
425 return ;
426}
427
428
429/**
430 * allocate_me_clients_storage - allocates storage for me clients
431 *
432 * @dev: the device structure
433 *
434 * returns none.
435 */
436void mei_allocate_me_clients_storage(struct mei_device *dev)
437{
438 struct mei_me_client *clients;
439 int b;
440
441 /* count how many ME clients we have */
442 for_each_set_bit(b, dev->me_clients_map, MEI_CLIENTS_MAX)
443 dev->me_clients_num++;
444
445 if (dev->me_clients_num <= 0)
446 return ;
447
448
449 if (dev->me_clients != NULL) {
450 kfree(dev->me_clients);
451 dev->me_clients = NULL;
452 }
453 dev_dbg(&dev->pdev->dev, "memory allocation for ME clients size=%zd.\n",
454 dev->me_clients_num * sizeof(struct mei_me_client));
455 /* allocate storage for ME clients representation */
456 clients = kcalloc(dev->me_clients_num,
457 sizeof(struct mei_me_client), GFP_KERNEL);
458 if (!clients) {
459 dev_dbg(&dev->pdev->dev, "memory allocation for ME clients failed.\n");
460 dev->mei_state = MEI_RESETING;
461 mei_reset(dev, 1);
462 return ;
463 }
464 dev->me_clients = clients;
465 return ;
466}
467/**
468 * host_client_properties - reads properties for client
469 *
470 * @dev: the device structure
471 *
472 * returns none.
473 */
474void mei_host_client_properties(struct mei_device *dev)
475{
476 struct mei_msg_hdr *mei_header;
477 struct hbm_props_request *host_cli_req;
478 int b;
479 u8 client_num = dev->me_client_presentation_num;
480
481 b = dev->me_client_index;
482 b = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, b);
483 if (b < MEI_CLIENTS_MAX) {
484 dev->me_clients[client_num].client_id = b;
485 dev->me_clients[client_num].mei_flow_ctrl_creds = 0;
486 mei_header = (struct mei_msg_hdr *)&dev->wr_msg_buf[0];
487 mei_header->host_addr = 0;
488 mei_header->me_addr = 0;
489 mei_header->length = sizeof(struct hbm_props_request);
490 mei_header->msg_complete = 1;
491 mei_header->reserved = 0;
492
493 host_cli_req = (struct hbm_props_request *)&dev->wr_msg_buf[1];
494
495 memset(host_cli_req, 0, sizeof(struct hbm_props_request));
496
497 host_cli_req->cmd.cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
498 host_cli_req->address = b;
499
500 if (!mei_write_message(dev, mei_header,
501 (unsigned char *)host_cli_req,
502 mei_header->length)) {
503 dev->mei_state = MEI_RESETING;
504 dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
505 mei_reset(dev, 1);
506 return;
507 }
508
509 dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
510 dev->me_client_index = b;
511 return;
512 }
513
514
515 /*
516 * Clear Map for indicating now ME clients
517 * with associated host client
518 */
519 bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
520 dev->open_handle_count = 0;
521 bitmap_set(dev->host_clients_map, 0, 3);
522 dev->mei_state = MEI_ENABLED;
523
524 mei_wd_host_init(dev);
525 return;
526}
527
528/**
529 * mei_init_file_private - initializes private file structure.
530 *
531 * @priv: private file structure to be initialized
532 * @file: the file structure
533 */
534void mei_cl_init(struct mei_cl *priv, struct mei_device *dev)
535{
536 memset(priv, 0, sizeof(struct mei_cl));
537 init_waitqueue_head(&priv->wait);
538 init_waitqueue_head(&priv->rx_wait);
539 init_waitqueue_head(&priv->tx_wait);
540 INIT_LIST_HEAD(&priv->link);
541 priv->reading_state = MEI_IDLE;
542 priv->writing_state = MEI_IDLE;
543 priv->dev = dev;
544}
545
546int mei_find_me_client_index(const struct mei_device *dev, uuid_le cuuid)
547{
548 int i, res = -1;
549
550 for (i = 0; i < dev->me_clients_num; ++i)
551 if (uuid_le_cmp(cuuid,
552 dev->me_clients[i].props.protocol_name) == 0) {
553 res = i;
554 break;
555 }
556
557 return res;
558}
559
560
561/**
562 * mei_find_me_client_update_filext - searches for ME client guid
563 * sets client_id in mei_file_private if found
564 * @dev: the device structure
565 * @priv: private file structure to set client_id in
566 * @cguid: searched guid of ME client
567 * @client_id: id of host client to be set in file private structure
568 *
569 * returns ME client index
570 */
571u8 mei_find_me_client_update_filext(struct mei_device *dev, struct mei_cl *priv,
572 const uuid_le *cguid, u8 client_id)
573{
574 int i;
575
576 if (!dev || !priv || !cguid)
577 return 0;
578
579 /* check for valid client id */
580 i = mei_find_me_client_index(dev, *cguid);
581 if (i >= 0) {
582 priv->me_client_id = dev->me_clients[i].client_id;
583 priv->state = MEI_FILE_CONNECTING;
584 priv->host_client_id = client_id;
585
586 list_add_tail(&priv->link, &dev->file_list);
587 return (u8)i;
588 }
589
590 return 0;
591}
592
593/**
594 * host_init_iamthif - mei initialization iamthif client.
595 *
596 * @dev: the device structure
597 *
598 */
599void mei_host_init_iamthif(struct mei_device *dev)
600{
601 u8 i;
602 unsigned char *msg_buf;
603
604 mei_cl_init(&dev->iamthif_cl, dev);
605 dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
606
607 /* find ME amthi client */
608 i = mei_find_me_client_update_filext(dev, &dev->iamthif_cl,
609 &mei_amthi_guid, MEI_IAMTHIF_HOST_CLIENT_ID);
610 if (dev->iamthif_cl.state != MEI_FILE_CONNECTING) {
611 dev_dbg(&dev->pdev->dev, "failed to find iamthif client.\n");
612 return;
613 }
614
615 /* Do not render the system unusable when iamthif_mtu is not equal to
616 the value received from ME.
617 Assign iamthif_mtu to the value received from ME in order to solve the
618 hardware macro incompatibility. */
619
620 dev_dbg(&dev->pdev->dev, "[DEFAULT] IAMTHIF = %d\n", dev->iamthif_mtu);
621 dev->iamthif_mtu = dev->me_clients[i].props.max_msg_length;
622 dev_dbg(&dev->pdev->dev,
623 "IAMTHIF = %d\n",
624 dev->me_clients[i].props.max_msg_length);
625
626 kfree(dev->iamthif_msg_buf);
627 dev->iamthif_msg_buf = NULL;
628
629 /* allocate storage for ME message buffer */
630 msg_buf = kcalloc(dev->iamthif_mtu,
631 sizeof(unsigned char), GFP_KERNEL);
632 if (!msg_buf) {
633 dev_dbg(&dev->pdev->dev, "memory allocation for ME message buffer failed.\n");
634 return;
635 }
636
637 dev->iamthif_msg_buf = msg_buf;
638
639 if (!mei_connect(dev, &dev->iamthif_cl)) {
640 dev_dbg(&dev->pdev->dev, "Failed to connect to AMTHI client\n");
641 dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
642 dev->iamthif_cl.host_client_id = 0;
643 } else {
644 dev->iamthif_cl.timer_count = CONNECT_TIMEOUT;
645 }
646}
647
648/**
649 * mei_alloc_file_private - allocates a private file structure and sets it up.
650 * @file: the file structure
651 *
652 * returns The allocated file or NULL on failure
653 */
654struct mei_cl *mei_cl_allocate(struct mei_device *dev)
655{
656 struct mei_cl *cl;
657
658 cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
659 if (!cl)
660 return NULL;
661
662 mei_cl_init(cl, dev);
663
664 return cl;
665}
666
667
668
669/**
670 * mei_disconnect_host_client - sends disconnect message to fw from host client.
671 *
672 * @dev: the device structure
673 * @cl: private data of the file object
674 *
675 * Locking: called under "dev->device_lock" lock
676 *
677 * returns 0 on success, <0 on failure.
678 */
679int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *cl)
680{
681 int rets, err;
682 long timeout = 15; /* 15 seconds */
683 struct mei_cl_cb *cb;
684
685 if (!dev || !cl)
686 return -ENODEV;
687
688 if (cl->state != MEI_FILE_DISCONNECTING)
689 return 0;
690
691 cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
692 if (!cb)
693 return -ENOMEM;
694
695 INIT_LIST_HEAD(&cb->cb_list);
696 cb->file_private = cl;
697 cb->major_file_operations = MEI_CLOSE;
698 if (dev->mei_host_buffer_is_empty) {
699 dev->mei_host_buffer_is_empty = false;
700 if (mei_disconnect(dev, cl)) {
701 mdelay(10); /* Wait for hardware disconnection ready */
702 list_add_tail(&cb->cb_list,
703 &dev->ctrl_rd_list.mei_cb.cb_list);
704 } else {
705 rets = -ENODEV;
706 dev_dbg(&dev->pdev->dev, "failed to call mei_disconnect.\n");
707 goto free;
708 }
709 } else {
710 dev_dbg(&dev->pdev->dev, "add disconnect cb to control write list\n");
711 list_add_tail(&cb->cb_list,
712 &dev->ctrl_wr_list.mei_cb.cb_list);
713 }
714 mutex_unlock(&dev->device_lock);
715
716 err = wait_event_timeout(dev->wait_recvd_msg,
717 (MEI_FILE_DISCONNECTED == cl->state),
718 timeout * HZ);
719
720 mutex_lock(&dev->device_lock);
721 if (MEI_FILE_DISCONNECTED == cl->state) {
722 rets = 0;
723 dev_dbg(&dev->pdev->dev, "successfully disconnected from FW client.\n");
724 } else {
725 rets = -ENODEV;
726 if (MEI_FILE_DISCONNECTED != cl->state)
727 dev_dbg(&dev->pdev->dev, "wrong status client disconnect.\n");
728
729 if (err)
730 dev_dbg(&dev->pdev->dev,
731 "wait failed disconnect err=%08x\n",
732 err);
733
734 dev_dbg(&dev->pdev->dev, "failed to disconnect from FW client.\n");
735 }
736
737 mei_io_list_flush(&dev->ctrl_rd_list, cl);
738 mei_io_list_flush(&dev->ctrl_wr_list, cl);
739free:
740 mei_free_cb_private(cb);
741 return rets;
742}
743
744/**
745 * mei_remove_client_from_file_list -
746 * removes file private data from device file list
747 *
748 * @dev: the device structure
749 * @host_client_id: host client id to be removed
750 */
751void mei_remove_client_from_file_list(struct mei_device *dev,
752 u8 host_client_id)
753{
754 struct mei_cl *cl_pos = NULL;
755 struct mei_cl *cl_next = NULL;
756 list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
757 if (host_client_id == cl_pos->host_client_id) {
758 dev_dbg(&dev->pdev->dev, "remove host client = %d, ME client = %d\n",
759 cl_pos->host_client_id,
760 cl_pos->me_client_id);
761 list_del_init(&cl_pos->link);
762 break;
763 }
764 }
765}
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-14 08:46:15 -0500