3 * Intel Management Engine Interface (Intel MEI) Linux driver
4 * Copyright (c) 2003-2012, Intel Corporation.
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.
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
17 #include <linux/pci.h>
18 #include <linux/sched.h>
19 #include <linux/wait.h>
20 #include <linux/delay.h>
22 #include <linux/mei.h>
29 * mei_me_cl_by_uuid - locate index of me client
32 * returns me client index or -ENOENT if not found
34 int mei_me_cl_by_uuid(const struct mei_device *dev, const uuid_le *uuid)
38 for (i = 0; i < dev->me_clients_num; ++i)
39 if (uuid_le_cmp(*uuid,
40 dev->me_clients[i].props.protocol_name) == 0) {
50 * mei_me_cl_by_id return index to me_clients for client_id
52 * @dev: the device structure
53 * @client_id: me client id
55 * Locking: called under "dev->device_lock" lock
57 * returns index on success, -ENOENT on failure.
60 int mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
63 for (i = 0; i < dev->me_clients_num; i++)
64 if (dev->me_clients[i].client_id == client_id)
66 if (WARN_ON(dev->me_clients[i].client_id != client_id))
69 if (i == dev->me_clients_num)
77 * mei_io_list_flush - removes list entry belonging to cl.
79 * @list: An instance of our list structure
82 void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl)
85 struct mei_cl_cb *next;
87 list_for_each_entry_safe(cb, next, &list->list, list) {
88 if (cb->cl && mei_cl_cmp_id(cl, cb->cl))
94 * mei_io_cb_free - free mei_cb_private related memory
96 * @cb: mei callback struct
98 void mei_io_cb_free(struct mei_cl_cb *cb)
103 kfree(cb->request_buffer.data);
104 kfree(cb->response_buffer.data);
109 * mei_io_cb_init - allocate and initialize io callback
112 * @fp: pointer to file structure
114 * returns mei_cl_cb pointer or NULL;
116 struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp)
118 struct mei_cl_cb *cb;
120 cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
124 mei_io_list_init(cb);
126 cb->file_object = fp;
133 * mei_io_cb_alloc_req_buf - allocate request buffer
135 * @cb: io callback structure
136 * @length: size of the buffer
138 * returns 0 on success
139 * -EINVAL if cb is NULL
140 * -ENOMEM if allocation failed
142 int mei_io_cb_alloc_req_buf(struct mei_cl_cb *cb, size_t length)
150 cb->request_buffer.data = kmalloc(length, GFP_KERNEL);
151 if (!cb->request_buffer.data)
153 cb->request_buffer.size = length;
157 * mei_io_cb_alloc_resp_buf - allocate respose buffer
159 * @cb: io callback structure
160 * @length: size of the buffer
162 * returns 0 on success
163 * -EINVAL if cb is NULL
164 * -ENOMEM if allocation failed
166 int mei_io_cb_alloc_resp_buf(struct mei_cl_cb *cb, size_t length)
174 cb->response_buffer.data = kmalloc(length, GFP_KERNEL);
175 if (!cb->response_buffer.data)
177 cb->response_buffer.size = length;
184 * mei_cl_flush_queues - flushes queue lists belonging to cl.
188 int mei_cl_flush_queues(struct mei_cl *cl)
190 if (WARN_ON(!cl || !cl->dev))
193 dev_dbg(&cl->dev->pdev->dev, "remove list entry belonging to cl\n");
194 mei_io_list_flush(&cl->dev->read_list, cl);
195 mei_io_list_flush(&cl->dev->write_list, cl);
196 mei_io_list_flush(&cl->dev->write_waiting_list, cl);
197 mei_io_list_flush(&cl->dev->ctrl_wr_list, cl);
198 mei_io_list_flush(&cl->dev->ctrl_rd_list, cl);
199 mei_io_list_flush(&cl->dev->amthif_cmd_list, cl);
200 mei_io_list_flush(&cl->dev->amthif_rd_complete_list, cl);
206 * mei_cl_init - initializes intialize cl.
208 * @cl: host client to be initialized
211 void mei_cl_init(struct mei_cl *cl, struct mei_device *dev)
213 memset(cl, 0, sizeof(struct mei_cl));
214 init_waitqueue_head(&cl->wait);
215 init_waitqueue_head(&cl->rx_wait);
216 init_waitqueue_head(&cl->tx_wait);
217 INIT_LIST_HEAD(&cl->link);
218 cl->reading_state = MEI_IDLE;
219 cl->writing_state = MEI_IDLE;
224 * mei_cl_allocate - allocates cl structure and sets it up.
227 * returns The allocated file or NULL on failure
229 struct mei_cl *mei_cl_allocate(struct mei_device *dev)
233 cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
237 mei_cl_init(cl, dev);
243 * mei_cl_find_read_cb - find this cl's callback in the read list
247 * returns cb on success, NULL on error
249 struct mei_cl_cb *mei_cl_find_read_cb(struct mei_cl *cl)
251 struct mei_device *dev = cl->dev;
252 struct mei_cl_cb *cb = NULL;
253 struct mei_cl_cb *next = NULL;
255 list_for_each_entry_safe(cb, next, &dev->read_list.list, list)
256 if (mei_cl_cmp_id(cl, cb->cl))
261 /** mei_cl_link: allocte host id in the host map
264 * @id - fixed host id or -1 for genereting one
266 * returns 0 on success
267 * -EINVAL on incorrect values
268 * -ENONET if client not found
270 int mei_cl_link(struct mei_cl *cl, int id)
272 struct mei_device *dev;
274 if (WARN_ON(!cl || !cl->dev))
279 /* If Id is not asigned get one*/
280 if (id == MEI_HOST_CLIENT_ID_ANY)
281 id = find_first_zero_bit(dev->host_clients_map,
284 if (id >= MEI_CLIENTS_MAX) {
285 dev_err(&dev->pdev->dev, "id exceded %d", MEI_CLIENTS_MAX) ;
289 dev->open_handle_count++;
291 cl->host_client_id = id;
292 list_add_tail(&cl->link, &dev->file_list);
294 set_bit(id, dev->host_clients_map);
296 cl->state = MEI_FILE_INITIALIZING;
298 dev_dbg(&dev->pdev->dev, "link cl host id = %d\n", cl->host_client_id);
303 * mei_cl_unlink - remove me_cl from the list
307 int mei_cl_unlink(struct mei_cl *cl)
309 struct mei_device *dev;
310 struct mei_cl *pos, *next;
312 /* don't shout on error exit path */
316 /* wd and amthif might not be initialized */
322 list_for_each_entry_safe(pos, next, &dev->file_list, link) {
323 if (cl->host_client_id == pos->host_client_id) {
324 dev_dbg(&dev->pdev->dev, "remove host client = %d, ME client = %d\n",
325 pos->host_client_id, pos->me_client_id);
326 list_del_init(&pos->link);
334 void mei_host_client_init(struct work_struct *work)
336 struct mei_device *dev = container_of(work,
337 struct mei_device, init_work);
338 struct mei_client_properties *client_props;
341 mutex_lock(&dev->device_lock);
343 bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
344 dev->open_handle_count = 0;
347 * Reserving the first three client IDs
348 * 0: Reserved for MEI Bus Message communications
349 * 1: Reserved for Watchdog
350 * 2: Reserved for AMTHI
352 bitmap_set(dev->host_clients_map, 0, 3);
354 for (i = 0; i < dev->me_clients_num; i++) {
355 client_props = &dev->me_clients[i].props;
357 if (!uuid_le_cmp(client_props->protocol_name, mei_amthif_guid))
358 mei_amthif_host_init(dev);
359 else if (!uuid_le_cmp(client_props->protocol_name, mei_wd_guid))
360 mei_wd_host_init(dev);
363 dev->dev_state = MEI_DEV_ENABLED;
365 mutex_unlock(&dev->device_lock);
370 * mei_cl_disconnect - disconnect host clinet form the me one
374 * Locking: called under "dev->device_lock" lock
376 * returns 0 on success, <0 on failure.
378 int mei_cl_disconnect(struct mei_cl *cl)
380 struct mei_device *dev;
381 struct mei_cl_cb *cb;
384 if (WARN_ON(!cl || !cl->dev))
389 if (cl->state != MEI_FILE_DISCONNECTING)
392 cb = mei_io_cb_init(cl, NULL);
396 cb->fop_type = MEI_FOP_CLOSE;
397 if (dev->hbuf_is_ready) {
398 dev->hbuf_is_ready = false;
399 if (mei_hbm_cl_disconnect_req(dev, cl)) {
401 dev_err(&dev->pdev->dev, "failed to disconnect.\n");
404 mdelay(10); /* Wait for hardware disconnection ready */
405 list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
407 dev_dbg(&dev->pdev->dev, "add disconnect cb to control write list\n");
408 list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
411 mutex_unlock(&dev->device_lock);
413 err = wait_event_timeout(dev->wait_recvd_msg,
414 MEI_FILE_DISCONNECTED == cl->state,
415 mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
417 mutex_lock(&dev->device_lock);
418 if (MEI_FILE_DISCONNECTED == cl->state) {
420 dev_dbg(&dev->pdev->dev, "successfully disconnected from FW client.\n");
423 if (MEI_FILE_DISCONNECTED != cl->state)
424 dev_dbg(&dev->pdev->dev, "wrong status client disconnect.\n");
427 dev_dbg(&dev->pdev->dev,
428 "wait failed disconnect err=%08x\n",
431 dev_dbg(&dev->pdev->dev, "failed to disconnect from FW client.\n");
434 mei_io_list_flush(&dev->ctrl_rd_list, cl);
435 mei_io_list_flush(&dev->ctrl_wr_list, cl);
443 * mei_cl_is_other_connecting - checks if other
444 * client with the same me client id is connecting
446 * @cl: private data of the file object
448 * returns ture if other client is connected, 0 - otherwise.
450 bool mei_cl_is_other_connecting(struct mei_cl *cl)
452 struct mei_device *dev;
456 if (WARN_ON(!cl || !cl->dev))
461 list_for_each_entry_safe(pos, next, &dev->file_list, link) {
462 if ((pos->state == MEI_FILE_CONNECTING) &&
463 (pos != cl) && cl->me_client_id == pos->me_client_id)
472 * mei_cl_connect - connect host clinet to the me one
476 * Locking: called under "dev->device_lock" lock
478 * returns 0 on success, <0 on failure.
480 int mei_cl_connect(struct mei_cl *cl, struct file *file)
482 struct mei_device *dev;
483 struct mei_cl_cb *cb;
484 long timeout = mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT);
487 if (WARN_ON(!cl || !cl->dev))
492 cb = mei_io_cb_init(cl, file);
498 cb->fop_type = MEI_FOP_IOCTL;
500 if (dev->hbuf_is_ready && !mei_cl_is_other_connecting(cl)) {
501 dev->hbuf_is_ready = false;
503 if (mei_hbm_cl_connect_req(dev, cl)) {
507 cl->timer_count = MEI_CONNECT_TIMEOUT;
508 list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
510 list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
513 mutex_unlock(&dev->device_lock);
514 rets = wait_event_timeout(dev->wait_recvd_msg,
515 (cl->state == MEI_FILE_CONNECTED ||
516 cl->state == MEI_FILE_DISCONNECTED),
518 mutex_lock(&dev->device_lock);
520 if (cl->state != MEI_FILE_CONNECTED) {
523 mei_io_list_flush(&dev->ctrl_rd_list, cl);
524 mei_io_list_flush(&dev->ctrl_wr_list, cl);
536 * mei_cl_flow_ctrl_creds - checks flow_control credits for cl.
538 * @cl: private data of the file object
540 * returns 1 if mei_flow_ctrl_creds >0, 0 - otherwise.
541 * -ENOENT if mei_cl is not present
542 * -EINVAL if single_recv_buf == 0
544 int mei_cl_flow_ctrl_creds(struct mei_cl *cl)
546 struct mei_device *dev;
549 if (WARN_ON(!cl || !cl->dev))
554 if (!dev->me_clients_num)
557 if (cl->mei_flow_ctrl_creds > 0)
560 for (i = 0; i < dev->me_clients_num; i++) {
561 struct mei_me_client *me_cl = &dev->me_clients[i];
562 if (me_cl->client_id == cl->me_client_id) {
563 if (me_cl->mei_flow_ctrl_creds) {
564 if (WARN_ON(me_cl->props.single_recv_buf == 0))
576 * mei_cl_flow_ctrl_reduce - reduces flow_control.
578 * @cl: private data of the file object
582 * -ENOENT when me client is not found
583 * -EINVAL when ctrl credits are <= 0
585 int mei_cl_flow_ctrl_reduce(struct mei_cl *cl)
587 struct mei_device *dev;
590 if (WARN_ON(!cl || !cl->dev))
595 if (!dev->me_clients_num)
598 for (i = 0; i < dev->me_clients_num; i++) {
599 struct mei_me_client *me_cl = &dev->me_clients[i];
600 if (me_cl->client_id == cl->me_client_id) {
601 if (me_cl->props.single_recv_buf != 0) {
602 if (WARN_ON(me_cl->mei_flow_ctrl_creds <= 0))
604 dev->me_clients[i].mei_flow_ctrl_creds--;
606 if (WARN_ON(cl->mei_flow_ctrl_creds <= 0))
608 cl->mei_flow_ctrl_creds--;
617 * mei_cl_read_start - the start read client message function.
621 * returns 0 on success, <0 on failure.
623 int mei_cl_read_start(struct mei_cl *cl)
625 struct mei_device *dev;
626 struct mei_cl_cb *cb;
630 if (WARN_ON(!cl || !cl->dev))
635 if (cl->state != MEI_FILE_CONNECTED)
638 if (dev->dev_state != MEI_DEV_ENABLED)
642 dev_dbg(&dev->pdev->dev, "read is pending.\n");
645 i = mei_me_cl_by_id(dev, cl->me_client_id);
647 dev_err(&dev->pdev->dev, "no such me client %d\n",
652 cb = mei_io_cb_init(cl, NULL);
656 rets = mei_io_cb_alloc_resp_buf(cb,
657 dev->me_clients[i].props.max_msg_length);
661 cb->fop_type = MEI_FOP_READ;
663 if (dev->hbuf_is_ready) {
664 dev->hbuf_is_ready = false;
665 if (mei_hbm_cl_flow_control_req(dev, cl)) {
669 list_add_tail(&cb->list, &dev->read_list.list);
671 list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
680 * mei_cl_all_disconnect - disconnect forcefully all connected clients
685 void mei_cl_all_disconnect(struct mei_device *dev)
687 struct mei_cl *cl, *next;
689 list_for_each_entry_safe(cl, next, &dev->file_list, link) {
690 cl->state = MEI_FILE_DISCONNECTED;
691 cl->mei_flow_ctrl_creds = 0;
699 * mei_cl_all_read_wakeup - wake up all readings so they can be interrupted
703 void mei_cl_all_read_wakeup(struct mei_device *dev)
705 struct mei_cl *cl, *next;
706 list_for_each_entry_safe(cl, next, &dev->file_list, link) {
707 if (waitqueue_active(&cl->rx_wait)) {
708 dev_dbg(&dev->pdev->dev, "Waking up client!\n");
709 wake_up_interruptible(&cl->rx_wait);
715 * mei_cl_all_write_clear - clear all pending writes
719 void mei_cl_all_write_clear(struct mei_device *dev)
721 struct mei_cl_cb *cb, *next;
723 list_for_each_entry_safe(cb, next, &dev->write_list.list, list) {