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
18 #include <linux/export.h>
19 #include <linux/kthread.h>
20 #include <linux/interrupt.h>
22 #include <linux/jiffies.h>
23 #include <linux/slab.h>
25 #include <linux/mei.h>
33 * mei_irq_compl_handler - dispatch complete handlers
34 * for the completed callbacks
37 * @compl_list: list of completed cbs
39 void mei_irq_compl_handler(struct mei_device
*dev
, struct mei_cl_cb
*compl_list
)
41 struct mei_cl_cb
*cb
, *next
;
44 list_for_each_entry_safe(cb
, next
, &compl_list
->list
, list
) {
48 dev_dbg(dev
->dev
, "completing call back.\n");
49 if (cl
== &dev
->iamthif_cl
)
50 mei_amthif_complete(dev
, cb
);
52 mei_cl_complete(cl
, cb
);
55 EXPORT_SYMBOL_GPL(mei_irq_compl_handler
);
58 * mei_cl_hbm_equal - check if hbm is addressed to the client
61 * @mei_hdr: header of mei client message
63 * Return: true if matches, false otherwise
65 static inline int mei_cl_hbm_equal(struct mei_cl
*cl
,
66 struct mei_msg_hdr
*mei_hdr
)
68 return cl
->host_client_id
== mei_hdr
->host_addr
&&
69 cl
->me_client_id
== mei_hdr
->me_addr
;
72 * mei_cl_is_reading - checks if the client
73 * is the one to read this message
76 * @mei_hdr: header of mei message
78 * Return: true on match and false otherwise
80 static bool mei_cl_is_reading(struct mei_cl
*cl
, struct mei_msg_hdr
*mei_hdr
)
82 return mei_cl_hbm_equal(cl
, mei_hdr
) &&
83 cl
->state
== MEI_FILE_CONNECTED
&&
84 cl
->reading_state
!= MEI_READ_COMPLETE
;
88 * mei_cl_irq_read_msg - process client message
90 * @dev: the device structure
91 * @mei_hdr: header of mei client message
92 * @complete_list: An instance of our list structure
94 * Return: 0 on success, <0 on failure.
96 static int mei_cl_irq_read_msg(struct mei_device
*dev
,
97 struct mei_msg_hdr
*mei_hdr
,
98 struct mei_cl_cb
*complete_list
)
101 struct mei_cl_cb
*cb
, *next
;
102 unsigned char *buffer
= NULL
;
104 list_for_each_entry_safe(cb
, next
, &dev
->read_list
.list
, list
) {
106 if (!mei_cl_is_reading(cl
, mei_hdr
))
109 cl
->reading_state
= MEI_READING
;
111 if (cb
->response_buffer
.size
== 0 ||
112 cb
->response_buffer
.data
== NULL
) {
113 cl_err(dev
, cl
, "response buffer is not allocated.\n");
118 if (cb
->response_buffer
.size
< mei_hdr
->length
+ cb
->buf_idx
) {
119 cl_dbg(dev
, cl
, "message overflow. size %d len %d idx %ld\n",
120 cb
->response_buffer
.size
,
121 mei_hdr
->length
, cb
->buf_idx
);
122 buffer
= krealloc(cb
->response_buffer
.data
,
123 mei_hdr
->length
+ cb
->buf_idx
,
130 cb
->response_buffer
.data
= buffer
;
131 cb
->response_buffer
.size
=
132 mei_hdr
->length
+ cb
->buf_idx
;
135 buffer
= cb
->response_buffer
.data
+ cb
->buf_idx
;
136 mei_read_slots(dev
, buffer
, mei_hdr
->length
);
138 cb
->buf_idx
+= mei_hdr
->length
;
139 if (mei_hdr
->msg_complete
) {
142 cl_dbg(dev
, cl
, "completed read length = %lu\n",
144 list_add_tail(&cb
->list
, &complete_list
->list
);
149 dev_dbg(dev
->dev
, "message read\n");
151 mei_read_slots(dev
, dev
->rd_msg_buf
, mei_hdr
->length
);
152 dev_dbg(dev
->dev
, "discarding message " MEI_HDR_FMT
"\n",
153 MEI_HDR_PRM(mei_hdr
));
160 * mei_cl_irq_disconnect_rsp - send disconnection response message
163 * @cb: callback block.
164 * @cmpl_list: complete list.
166 * Return: 0, OK; otherwise, error.
168 static int mei_cl_irq_disconnect_rsp(struct mei_cl
*cl
, struct mei_cl_cb
*cb
,
169 struct mei_cl_cb
*cmpl_list
)
171 struct mei_device
*dev
= cl
->dev
;
176 slots
= mei_hbuf_empty_slots(dev
);
177 msg_slots
= mei_data2slots(sizeof(struct hbm_client_connect_response
));
179 if (slots
< msg_slots
)
182 ret
= mei_hbm_cl_disconnect_rsp(dev
, cl
);
184 cl
->state
= MEI_FILE_DISCONNECTED
;
195 * mei_cl_irq_disconnect - processes close related operation from
196 * interrupt thread context - send disconnect request
199 * @cb: callback block.
200 * @cmpl_list: complete list.
202 * Return: 0, OK; otherwise, error.
204 static int mei_cl_irq_disconnect(struct mei_cl
*cl
, struct mei_cl_cb
*cb
,
205 struct mei_cl_cb
*cmpl_list
)
207 struct mei_device
*dev
= cl
->dev
;
211 msg_slots
= mei_data2slots(sizeof(struct hbm_client_connect_request
));
212 slots
= mei_hbuf_empty_slots(dev
);
214 if (slots
< msg_slots
)
217 if (mei_hbm_cl_disconnect_req(dev
, cl
)) {
220 list_move_tail(&cb
->list
, &cmpl_list
->list
);
224 cl
->state
= MEI_FILE_DISCONNECTING
;
227 list_move_tail(&cb
->list
, &dev
->ctrl_rd_list
.list
);
228 cl
->timer_count
= MEI_CONNECT_TIMEOUT
;
235 * mei_cl_irq_read - processes client read related operation from the
236 * interrupt thread context - request for flow control credits
239 * @cb: callback block.
240 * @cmpl_list: complete list.
242 * Return: 0, OK; otherwise, error.
244 static int mei_cl_irq_read(struct mei_cl
*cl
, struct mei_cl_cb
*cb
,
245 struct mei_cl_cb
*cmpl_list
)
247 struct mei_device
*dev
= cl
->dev
;
252 msg_slots
= mei_data2slots(sizeof(struct hbm_flow_control
));
253 slots
= mei_hbuf_empty_slots(dev
);
255 if (slots
< msg_slots
)
258 ret
= mei_hbm_cl_flow_control_req(dev
, cl
);
262 list_move_tail(&cb
->list
, &cmpl_list
->list
);
266 list_move_tail(&cb
->list
, &dev
->read_list
.list
);
273 * mei_cl_irq_connect - send connect request in irq_thread context
276 * @cb: callback block.
277 * @cmpl_list: complete list.
279 * Return: 0, OK; otherwise, error.
281 static int mei_cl_irq_connect(struct mei_cl
*cl
, struct mei_cl_cb
*cb
,
282 struct mei_cl_cb
*cmpl_list
)
284 struct mei_device
*dev
= cl
->dev
;
289 msg_slots
= mei_data2slots(sizeof(struct hbm_client_connect_request
));
290 slots
= mei_hbuf_empty_slots(dev
);
292 if (mei_cl_is_other_connecting(cl
))
295 if (slots
< msg_slots
)
298 cl
->state
= MEI_FILE_CONNECTING
;
300 ret
= mei_hbm_cl_connect_req(dev
, cl
);
308 list_move_tail(&cb
->list
, &dev
->ctrl_rd_list
.list
);
309 cl
->timer_count
= MEI_CONNECT_TIMEOUT
;
315 * mei_irq_read_handler - bottom half read routine after ISR to
316 * handle the read processing.
318 * @dev: the device structure
319 * @cmpl_list: An instance of our list structure
320 * @slots: slots to read.
322 * Return: 0 on success, <0 on failure.
324 int mei_irq_read_handler(struct mei_device
*dev
,
325 struct mei_cl_cb
*cmpl_list
, s32
*slots
)
327 struct mei_msg_hdr
*mei_hdr
;
331 if (!dev
->rd_msg_hdr
) {
332 dev
->rd_msg_hdr
= mei_read_hdr(dev
);
334 dev_dbg(dev
->dev
, "slots =%08x.\n", *slots
);
336 mei_hdr
= (struct mei_msg_hdr
*) &dev
->rd_msg_hdr
;
337 dev_dbg(dev
->dev
, MEI_HDR_FMT
, MEI_HDR_PRM(mei_hdr
));
339 if (mei_hdr
->reserved
|| !dev
->rd_msg_hdr
) {
340 dev_err(dev
->dev
, "corrupted message header 0x%08X\n",
346 if (mei_slots2data(*slots
) < mei_hdr
->length
) {
347 dev_err(dev
->dev
, "less data available than length=%08x.\n",
349 /* we can't read the message */
355 if (mei_hdr
->host_addr
== 0 && mei_hdr
->me_addr
== 0) {
356 ret
= mei_hbm_dispatch(dev
, mei_hdr
);
358 dev_dbg(dev
->dev
, "mei_hbm_dispatch failed ret = %d\n",
365 /* find recipient cl */
366 list_for_each_entry(cl
, &dev
->file_list
, link
) {
367 if (mei_cl_hbm_equal(cl
, mei_hdr
)) {
368 cl_dbg(dev
, cl
, "got a message\n");
373 /* if no recipient cl was found we assume corrupted header */
374 if (&cl
->link
== &dev
->file_list
) {
375 dev_err(dev
->dev
, "no destination client found 0x%08X\n",
381 if (mei_hdr
->host_addr
== dev
->iamthif_cl
.host_client_id
&&
382 MEI_FILE_CONNECTED
== dev
->iamthif_cl
.state
&&
383 dev
->iamthif_state
== MEI_IAMTHIF_READING
) {
385 ret
= mei_amthif_irq_read_msg(dev
, mei_hdr
, cmpl_list
);
387 dev_err(dev
->dev
, "mei_amthif_irq_read_msg failed = %d\n",
392 ret
= mei_cl_irq_read_msg(dev
, mei_hdr
, cmpl_list
);
394 dev_err(dev
->dev
, "mei_cl_irq_read_msg failed = %d\n",
401 /* reset the number of slots and header */
402 *slots
= mei_count_full_read_slots(dev
);
405 if (*slots
== -EOVERFLOW
) {
406 /* overflow - reset */
407 dev_err(dev
->dev
, "resetting due to slots overflow.\n");
408 /* set the event since message has been read */
415 EXPORT_SYMBOL_GPL(mei_irq_read_handler
);
419 * mei_irq_write_handler - dispatch write requests
422 * @dev: the device structure
423 * @cmpl_list: An instance of our list structure
425 * Return: 0 on success, <0 on failure.
427 int mei_irq_write_handler(struct mei_device
*dev
, struct mei_cl_cb
*cmpl_list
)
431 struct mei_cl_cb
*cb
, *next
;
432 struct mei_cl_cb
*list
;
437 if (!mei_hbuf_acquire(dev
))
440 slots
= mei_hbuf_empty_slots(dev
);
444 /* complete all waiting for write CB */
445 dev_dbg(dev
->dev
, "complete all waiting for write cb.\n");
447 list
= &dev
->write_waiting_list
;
448 list_for_each_entry_safe(cb
, next
, &list
->list
, list
) {
453 if (cb
->fop_type
== MEI_FOP_WRITE
&&
454 cl
!= &dev
->iamthif_cl
) {
455 cl_dbg(dev
, cl
, "MEI WRITE COMPLETE\n");
456 cl
->writing_state
= MEI_WRITE_COMPLETE
;
457 list_add_tail(&cb
->list
, &cmpl_list
->list
);
459 if (cl
== &dev
->iamthif_cl
) {
460 cl_dbg(dev
, cl
, "check iamthif flow control.\n");
461 if (dev
->iamthif_flow_control_pending
) {
462 ret
= mei_amthif_irq_read(dev
, &slots
);
469 if (dev
->wd_state
== MEI_WD_STOPPING
) {
470 dev
->wd_state
= MEI_WD_IDLE
;
471 wake_up(&dev
->wait_stop_wd
);
474 if (mei_cl_is_connected(&dev
->wd_cl
)) {
475 if (dev
->wd_pending
&&
476 mei_cl_flow_ctrl_creds(&dev
->wd_cl
) > 0) {
477 ret
= mei_wd_send(dev
);
480 dev
->wd_pending
= false;
484 /* complete control write list CB */
485 dev_dbg(dev
->dev
, "complete control write list cb.\n");
486 list_for_each_entry_safe(cb
, next
, &dev
->ctrl_wr_list
.list
, list
) {
488 switch (cb
->fop_type
) {
489 case MEI_FOP_DISCONNECT
:
490 /* send disconnect message */
491 ret
= mei_cl_irq_disconnect(cl
, cb
, cmpl_list
);
497 /* send flow control message */
498 ret
= mei_cl_irq_read(cl
, cb
, cmpl_list
);
503 case MEI_FOP_CONNECT
:
504 /* connect message */
505 ret
= mei_cl_irq_connect(cl
, cb
, cmpl_list
);
510 case MEI_FOP_DISCONNECT_RSP
:
511 /* send disconnect resp */
512 ret
= mei_cl_irq_disconnect_rsp(cl
, cb
, cmpl_list
);
521 /* complete write list CB */
522 dev_dbg(dev
->dev
, "complete write list cb.\n");
523 list_for_each_entry_safe(cb
, next
, &dev
->write_list
.list
, list
) {
525 if (cl
== &dev
->iamthif_cl
)
526 ret
= mei_amthif_irq_write(cl
, cb
, cmpl_list
);
528 ret
= mei_cl_irq_write(cl
, cb
, cmpl_list
);
534 EXPORT_SYMBOL_GPL(mei_irq_write_handler
);
539 * mei_timer - timer function.
541 * @work: pointer to the work_struct structure
544 void mei_timer(struct work_struct
*work
)
546 unsigned long timeout
;
549 struct mei_device
*dev
= container_of(work
,
550 struct mei_device
, timer_work
.work
);
553 mutex_lock(&dev
->device_lock
);
555 /* Catch interrupt stalls during HBM init handshake */
556 if (dev
->dev_state
== MEI_DEV_INIT_CLIENTS
&&
557 dev
->hbm_state
!= MEI_HBM_IDLE
) {
559 if (dev
->init_clients_timer
) {
560 if (--dev
->init_clients_timer
== 0) {
561 dev_err(dev
->dev
, "timer: init clients timeout hbm_state = %d.\n",
569 if (dev
->dev_state
!= MEI_DEV_ENABLED
)
572 /*** connect/disconnect timeouts ***/
573 list_for_each_entry(cl
, &dev
->file_list
, link
) {
574 if (cl
->timer_count
) {
575 if (--cl
->timer_count
== 0) {
576 dev_err(dev
->dev
, "timer: connect/disconnect timeout.\n");
583 if (!mei_cl_is_connected(&dev
->iamthif_cl
))
586 if (dev
->iamthif_stall_timer
) {
587 if (--dev
->iamthif_stall_timer
== 0) {
588 dev_err(dev
->dev
, "timer: amthif hanged.\n");
590 dev
->iamthif_msg_buf_size
= 0;
591 dev
->iamthif_msg_buf_index
= 0;
592 dev
->iamthif_canceled
= false;
593 dev
->iamthif_ioctl
= true;
594 dev
->iamthif_state
= MEI_IAMTHIF_IDLE
;
595 dev
->iamthif_timer
= 0;
597 mei_io_cb_free(dev
->iamthif_current_cb
);
598 dev
->iamthif_current_cb
= NULL
;
600 dev
->iamthif_file_object
= NULL
;
601 mei_amthif_run_next_cmd(dev
);
605 if (dev
->iamthif_timer
) {
607 timeout
= dev
->iamthif_timer
+
608 mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER
);
610 dev_dbg(dev
->dev
, "dev->iamthif_timer = %ld\n",
612 dev_dbg(dev
->dev
, "timeout = %ld\n", timeout
);
613 dev_dbg(dev
->dev
, "jiffies = %ld\n", jiffies
);
614 if (time_after(jiffies
, timeout
)) {
616 * User didn't read the AMTHI data on time (15sec)
617 * freeing AMTHI for other requests
620 dev_dbg(dev
->dev
, "freeing AMTHI for other requests\n");
622 mei_io_list_flush(&dev
->amthif_rd_complete_list
,
624 mei_io_cb_free(dev
->iamthif_current_cb
);
625 dev
->iamthif_current_cb
= NULL
;
627 dev
->iamthif_file_object
->private_data
= NULL
;
628 dev
->iamthif_file_object
= NULL
;
629 dev
->iamthif_timer
= 0;
630 mei_amthif_run_next_cmd(dev
);
635 if (dev
->dev_state
!= MEI_DEV_DISABLED
)
636 schedule_delayed_work(&dev
->timer_work
, 2 * HZ
);
637 mutex_unlock(&dev
->device_lock
);