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 * @file: 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 * @size: 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_req_buf - allocate respose buffer
159 * @cb - io callback structure
160 * @size: 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.
186 * @dev: the device structure
189 int mei_cl_flush_queues(struct mei_cl *cl)
191 if (WARN_ON(!cl || !cl->dev))
194 dev_dbg(&cl->dev->pdev->dev, "remove list entry belonging to cl\n");
195 mei_io_list_flush(&cl->dev->read_list, cl);
196 mei_io_list_flush(&cl->dev->write_list, cl);
197 mei_io_list_flush(&cl->dev->write_waiting_list, cl);
198 mei_io_list_flush(&cl->dev->ctrl_wr_list, cl);
199 mei_io_list_flush(&cl->dev->ctrl_rd_list, cl);
200 mei_io_list_flush(&cl->dev->amthif_cmd_list, cl);
201 mei_io_list_flush(&cl->dev->amthif_rd_complete_list, cl);
207 * mei_cl_init - initializes intialize cl.
209 * @cl: host client to be initialized
212 void mei_cl_init(struct mei_cl *cl, struct mei_device *dev)
214 memset(cl, 0, sizeof(struct mei_cl));
215 init_waitqueue_head(&cl->wait);
216 init_waitqueue_head(&cl->rx_wait);
217 init_waitqueue_head(&cl->tx_wait);
218 INIT_LIST_HEAD(&cl->link);
219 cl->reading_state = MEI_IDLE;
220 cl->writing_state = MEI_IDLE;
225 * mei_cl_allocate - allocates cl structure and sets it up.
228 * returns The allocated file or NULL on failure
230 struct mei_cl *mei_cl_allocate(struct mei_device *dev)
234 cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
238 mei_cl_init(cl, dev);
244 * mei_cl_find_read_cb - find this cl's callback in the read list
246 * @dev: device structure
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
265 * returns 0 on success
266 * -EINVAL on incorrect values
267 * -ENONET if client not found
269 int mei_cl_link(struct mei_cl *cl, int id)
271 struct mei_device *dev;
273 if (WARN_ON(!cl || !cl->dev))
278 /* If Id is not asigned get one*/
279 if (id == MEI_HOST_CLIENT_ID_ANY)
280 id = find_first_zero_bit(dev->host_clients_map,
283 if (id >= MEI_CLIENTS_MAX) {
284 dev_err(&dev->pdev->dev, "id exceded %d", MEI_CLIENTS_MAX) ;
288 dev->open_handle_count++;
290 cl->host_client_id = id;
291 list_add_tail(&cl->link, &dev->file_list);
293 set_bit(id, dev->host_clients_map);
295 cl->state = MEI_FILE_INITIALIZING;
297 dev_dbg(&dev->pdev->dev, "link cl host id = %d\n", cl->host_client_id);
302 * mei_cl_unlink - remove me_cl from the list
304 * @dev: the device structure
306 int mei_cl_unlink(struct mei_cl *cl)
308 struct mei_device *dev;
309 struct mei_cl *pos, *next;
311 /* don't shout on error exit path */
315 if (WARN_ON(!cl->dev))
320 list_for_each_entry_safe(pos, next, &dev->file_list, link) {
321 if (cl->host_client_id == pos->host_client_id) {
322 dev_dbg(&dev->pdev->dev, "remove host client = %d, ME client = %d\n",
323 pos->host_client_id, pos->me_client_id);
324 list_del_init(&pos->link);
332 void mei_host_client_init(struct work_struct *work)
334 struct mei_device *dev = container_of(work,
335 struct mei_device, init_work);
336 struct mei_client_properties *client_props;
339 mutex_lock(&dev->device_lock);
341 bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
342 dev->open_handle_count = 0;
345 * Reserving the first three client IDs
346 * 0: Reserved for MEI Bus Message communications
347 * 1: Reserved for Watchdog
348 * 2: Reserved for AMTHI
350 bitmap_set(dev->host_clients_map, 0, 3);
352 for (i = 0; i < dev->me_clients_num; i++) {
353 client_props = &dev->me_clients[i].props;
355 if (!uuid_le_cmp(client_props->protocol_name, mei_amthif_guid))
356 mei_amthif_host_init(dev);
357 else if (!uuid_le_cmp(client_props->protocol_name, mei_wd_guid))
358 mei_wd_host_init(dev);
361 dev->dev_state = MEI_DEV_ENABLED;
363 mutex_unlock(&dev->device_lock);
368 * mei_cl_disconnect - disconnect host clinet form the me one
372 * Locking: called under "dev->device_lock" lock
374 * returns 0 on success, <0 on failure.
376 int mei_cl_disconnect(struct mei_cl *cl)
378 struct mei_device *dev;
379 struct mei_cl_cb *cb;
382 if (WARN_ON(!cl || !cl->dev))
387 if (cl->state != MEI_FILE_DISCONNECTING)
390 cb = mei_io_cb_init(cl, NULL);
394 cb->fop_type = MEI_FOP_CLOSE;
395 if (dev->mei_host_buffer_is_empty) {
396 dev->mei_host_buffer_is_empty = false;
397 if (mei_hbm_cl_disconnect_req(dev, cl)) {
399 dev_err(&dev->pdev->dev, "failed to disconnect.\n");
402 mdelay(10); /* Wait for hardware disconnection ready */
403 list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
405 dev_dbg(&dev->pdev->dev, "add disconnect cb to control write list\n");
406 list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
409 mutex_unlock(&dev->device_lock);
411 err = wait_event_timeout(dev->wait_recvd_msg,
412 MEI_FILE_DISCONNECTED == cl->state,
413 mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
415 mutex_lock(&dev->device_lock);
416 if (MEI_FILE_DISCONNECTED == cl->state) {
418 dev_dbg(&dev->pdev->dev, "successfully disconnected from FW client.\n");
421 if (MEI_FILE_DISCONNECTED != cl->state)
422 dev_dbg(&dev->pdev->dev, "wrong status client disconnect.\n");
425 dev_dbg(&dev->pdev->dev,
426 "wait failed disconnect err=%08x\n",
429 dev_dbg(&dev->pdev->dev, "failed to disconnect from FW client.\n");
432 mei_io_list_flush(&dev->ctrl_rd_list, cl);
433 mei_io_list_flush(&dev->ctrl_wr_list, cl);
441 * mei_cl_is_other_connecting - checks if other
442 * client with the same me client id is connecting
444 * @cl: private data of the file object
446 * returns ture if other client is connected, 0 - otherwise.
448 bool mei_cl_is_other_connecting(struct mei_cl *cl)
450 struct mei_device *dev;
454 if (WARN_ON(!cl || !cl->dev))
459 list_for_each_entry_safe(pos, next, &dev->file_list, link) {
460 if ((pos->state == MEI_FILE_CONNECTING) &&
461 (pos != cl) && cl->me_client_id == pos->me_client_id)
470 * mei_cl_connect - connect host clinet to the me one
474 * Locking: called under "dev->device_lock" lock
476 * returns 0 on success, <0 on failure.
478 int mei_cl_connect(struct mei_cl *cl, struct file *file)
480 struct mei_device *dev;
481 struct mei_cl_cb *cb;
482 long timeout = mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT);
485 if (WARN_ON(!cl || !cl->dev))
490 cb = mei_io_cb_init(cl, file);
496 cb->fop_type = MEI_FOP_IOCTL;
498 if (dev->mei_host_buffer_is_empty &&
499 !mei_cl_is_other_connecting(cl)) {
500 dev->mei_host_buffer_is_empty = false;
502 if (mei_hbm_cl_connect_req(dev, cl)) {
506 cl->timer_count = MEI_CONNECT_TIMEOUT;
507 list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
509 list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
512 mutex_unlock(&dev->device_lock);
513 rets = wait_event_timeout(dev->wait_recvd_msg,
514 (cl->state == MEI_FILE_CONNECTED ||
515 cl->state == MEI_FILE_DISCONNECTED),
517 mutex_lock(&dev->device_lock);
519 if (cl->state != MEI_FILE_CONNECTED) {
522 mei_io_list_flush(&dev->ctrl_rd_list, cl);
523 mei_io_list_flush(&dev->ctrl_wr_list, cl);
535 * mei_cl_flow_ctrl_creds - checks flow_control credits for cl.
537 * @dev: the device structure
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 * @dev: the device structure
579 * @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_start_read - 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->mei_host_buffer_is_empty) {
664 dev->mei_host_buffer_is_empty = 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);