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>
24 #include <linux/pm_runtime.h>
26 #include <linux/mei.h>
34 * mei_irq_compl_handler - dispatch complete handlers
35 * for the completed callbacks
38 * @compl_list: list of completed cbs
40 void mei_irq_compl_handler(struct mei_device
*dev
, struct mei_cl_cb
*compl_list
)
42 struct mei_cl_cb
*cb
, *next
;
45 list_for_each_entry_safe(cb
, next
, &compl_list
->list
, list
) {
47 list_del_init(&cb
->list
);
49 dev_dbg(dev
->dev
, "completing call back.\n");
50 if (cl
== &dev
->iamthif_cl
)
51 mei_amthif_complete(cl
, cb
);
53 mei_cl_complete(cl
, cb
);
56 EXPORT_SYMBOL_GPL(mei_irq_compl_handler
);
59 * mei_cl_hbm_equal - check if hbm is addressed to the client
62 * @mei_hdr: header of mei client message
64 * Return: true if matches, false otherwise
66 static inline int mei_cl_hbm_equal(struct mei_cl
*cl
,
67 struct mei_msg_hdr
*mei_hdr
)
69 return mei_cl_host_addr(cl
) == mei_hdr
->host_addr
&&
70 mei_cl_me_id(cl
) == mei_hdr
->me_addr
;
74 * mei_irq_discard_msg - discard received message
77 * @hdr: message header
80 void mei_irq_discard_msg(struct mei_device
*dev
, struct mei_msg_hdr
*hdr
)
83 * no need to check for size as it is guarantied
84 * that length fits into rd_msg_buf
86 mei_read_slots(dev
, dev
->rd_msg_buf
, hdr
->length
);
87 dev_dbg(dev
->dev
, "discarding message " MEI_HDR_FMT
"\n",
92 * mei_cl_irq_read_msg - process client message
95 * @mei_hdr: header of mei client message
96 * @complete_list: completion list
100 int mei_cl_irq_read_msg(struct mei_cl
*cl
,
101 struct mei_msg_hdr
*mei_hdr
,
102 struct mei_cl_cb
*complete_list
)
104 struct mei_device
*dev
= cl
->dev
;
105 struct mei_cl_cb
*cb
;
106 unsigned char *buffer
= NULL
;
109 cb
= list_first_entry_or_null(&cl
->rd_pending
, struct mei_cl_cb
, list
);
111 cl_err(dev
, cl
, "pending read cb not found\n");
115 if (!mei_cl_is_connected(cl
)) {
116 cl_dbg(dev
, cl
, "not connected\n");
117 cb
->status
= -ENODEV
;
121 if (cb
->buf
.size
== 0 || cb
->buf
.data
== NULL
) {
122 cl_err(dev
, cl
, "response buffer is not allocated.\n");
123 list_move_tail(&cb
->list
, &complete_list
->list
);
124 cb
->status
= -ENOMEM
;
128 buf_sz
= mei_hdr
->length
+ cb
->buf_idx
;
129 /* catch for integer overflow */
130 if (buf_sz
< cb
->buf_idx
) {
131 cl_err(dev
, cl
, "message is too big len %d idx %zu\n",
132 mei_hdr
->length
, cb
->buf_idx
);
134 list_move_tail(&cb
->list
, &complete_list
->list
);
135 cb
->status
= -EMSGSIZE
;
139 if (cb
->buf
.size
< buf_sz
) {
140 cl_dbg(dev
, cl
, "message overflow. size %zu len %d idx %zu\n",
141 cb
->buf
.size
, mei_hdr
->length
, cb
->buf_idx
);
142 buffer
= krealloc(cb
->buf
.data
, buf_sz
, GFP_KERNEL
);
145 cb
->status
= -ENOMEM
;
146 list_move_tail(&cb
->list
, &complete_list
->list
);
149 cb
->buf
.data
= buffer
;
150 cb
->buf
.size
= buf_sz
;
153 buffer
= cb
->buf
.data
+ cb
->buf_idx
;
154 mei_read_slots(dev
, buffer
, mei_hdr
->length
);
156 cb
->buf_idx
+= mei_hdr
->length
;
158 if (mei_hdr
->msg_complete
) {
159 cl_dbg(dev
, cl
, "completed read length = %zu\n", cb
->buf_idx
);
160 list_move_tail(&cb
->list
, &complete_list
->list
);
162 pm_runtime_mark_last_busy(dev
->dev
);
163 pm_request_autosuspend(dev
->dev
);
168 mei_irq_discard_msg(dev
, mei_hdr
);
174 * mei_cl_irq_disconnect_rsp - send disconnection response message
177 * @cb: callback block.
178 * @cmpl_list: complete list.
180 * Return: 0, OK; otherwise, error.
182 static int mei_cl_irq_disconnect_rsp(struct mei_cl
*cl
, struct mei_cl_cb
*cb
,
183 struct mei_cl_cb
*cmpl_list
)
185 struct mei_device
*dev
= cl
->dev
;
190 slots
= mei_hbuf_empty_slots(dev
);
191 msg_slots
= mei_data2slots(sizeof(struct hbm_client_connect_response
));
193 if (slots
< msg_slots
)
196 ret
= mei_hbm_cl_disconnect_rsp(dev
, cl
);
197 mei_cl_set_disconnected(cl
);
199 mei_me_cl_put(cl
->me_cl
);
206 * mei_cl_irq_read - processes client read related operation from the
207 * interrupt thread context - request for flow control credits
210 * @cb: callback block.
211 * @cmpl_list: complete list.
213 * Return: 0, OK; otherwise, error.
215 static int mei_cl_irq_read(struct mei_cl
*cl
, struct mei_cl_cb
*cb
,
216 struct mei_cl_cb
*cmpl_list
)
218 struct mei_device
*dev
= cl
->dev
;
223 msg_slots
= mei_data2slots(sizeof(struct hbm_flow_control
));
224 slots
= mei_hbuf_empty_slots(dev
);
226 if (slots
< msg_slots
)
229 ret
= mei_hbm_cl_flow_control_req(dev
, cl
);
233 list_move_tail(&cb
->list
, &cmpl_list
->list
);
237 list_move_tail(&cb
->list
, &cl
->rd_pending
);
242 static inline bool hdr_is_hbm(struct mei_msg_hdr
*mei_hdr
)
244 return mei_hdr
->host_addr
== 0 && mei_hdr
->me_addr
== 0;
247 static inline bool hdr_is_fixed(struct mei_msg_hdr
*mei_hdr
)
249 return mei_hdr
->host_addr
== 0 && mei_hdr
->me_addr
!= 0;
253 * mei_irq_read_handler - bottom half read routine after ISR to
254 * handle the read processing.
256 * @dev: the device structure
257 * @cmpl_list: An instance of our list structure
258 * @slots: slots to read.
260 * Return: 0 on success, <0 on failure.
262 int mei_irq_read_handler(struct mei_device
*dev
,
263 struct mei_cl_cb
*cmpl_list
, s32
*slots
)
265 struct mei_msg_hdr
*mei_hdr
;
269 if (!dev
->rd_msg_hdr
) {
270 dev
->rd_msg_hdr
= mei_read_hdr(dev
);
272 dev_dbg(dev
->dev
, "slots =%08x.\n", *slots
);
274 mei_hdr
= (struct mei_msg_hdr
*) &dev
->rd_msg_hdr
;
275 dev_dbg(dev
->dev
, MEI_HDR_FMT
, MEI_HDR_PRM(mei_hdr
));
277 if (mei_hdr
->reserved
|| !dev
->rd_msg_hdr
) {
278 dev_err(dev
->dev
, "corrupted message header 0x%08X\n",
284 if (mei_slots2data(*slots
) < mei_hdr
->length
) {
285 dev_err(dev
->dev
, "less data available than length=%08x.\n",
287 /* we can't read the message */
293 if (hdr_is_hbm(mei_hdr
)) {
294 ret
= mei_hbm_dispatch(dev
, mei_hdr
);
296 dev_dbg(dev
->dev
, "mei_hbm_dispatch failed ret = %d\n",
303 /* find recipient cl */
304 list_for_each_entry(cl
, &dev
->file_list
, link
) {
305 if (mei_cl_hbm_equal(cl
, mei_hdr
)) {
306 cl_dbg(dev
, cl
, "got a message\n");
311 /* if no recipient cl was found we assume corrupted header */
312 if (&cl
->link
== &dev
->file_list
) {
313 /* A message for not connected fixed address clients
314 * should be silently discarded
316 if (hdr_is_fixed(mei_hdr
)) {
317 mei_irq_discard_msg(dev
, mei_hdr
);
321 dev_err(dev
->dev
, "no destination client found 0x%08X\n",
327 if (cl
== &dev
->iamthif_cl
) {
328 ret
= mei_amthif_irq_read_msg(cl
, mei_hdr
, cmpl_list
);
330 ret
= mei_cl_irq_read_msg(cl
, mei_hdr
, cmpl_list
);
335 /* reset the number of slots and header */
336 *slots
= mei_count_full_read_slots(dev
);
339 if (*slots
== -EOVERFLOW
) {
340 /* overflow - reset */
341 dev_err(dev
->dev
, "resetting due to slots overflow.\n");
342 /* set the event since message has been read */
349 EXPORT_SYMBOL_GPL(mei_irq_read_handler
);
353 * mei_irq_write_handler - dispatch write requests
356 * @dev: the device structure
357 * @cmpl_list: An instance of our list structure
359 * Return: 0 on success, <0 on failure.
361 int mei_irq_write_handler(struct mei_device
*dev
, struct mei_cl_cb
*cmpl_list
)
365 struct mei_cl_cb
*cb
, *next
;
366 struct mei_cl_cb
*list
;
371 if (!mei_hbuf_acquire(dev
))
374 slots
= mei_hbuf_empty_slots(dev
);
378 /* complete all waiting for write CB */
379 dev_dbg(dev
->dev
, "complete all waiting for write cb.\n");
381 list
= &dev
->write_waiting_list
;
382 list_for_each_entry_safe(cb
, next
, &list
->list
, list
) {
386 cl_dbg(dev
, cl
, "MEI WRITE COMPLETE\n");
387 cl
->writing_state
= MEI_WRITE_COMPLETE
;
388 list_move_tail(&cb
->list
, &cmpl_list
->list
);
391 /* complete control write list CB */
392 dev_dbg(dev
->dev
, "complete control write list cb.\n");
393 list_for_each_entry_safe(cb
, next
, &dev
->ctrl_wr_list
.list
, list
) {
395 switch (cb
->fop_type
) {
396 case MEI_FOP_DISCONNECT
:
397 /* send disconnect message */
398 ret
= mei_cl_irq_disconnect(cl
, cb
, cmpl_list
);
404 /* send flow control message */
405 ret
= mei_cl_irq_read(cl
, cb
, cmpl_list
);
410 case MEI_FOP_CONNECT
:
411 /* connect message */
412 ret
= mei_cl_irq_connect(cl
, cb
, cmpl_list
);
417 case MEI_FOP_DISCONNECT_RSP
:
418 /* send disconnect resp */
419 ret
= mei_cl_irq_disconnect_rsp(cl
, cb
, cmpl_list
);
424 case MEI_FOP_NOTIFY_START
:
425 case MEI_FOP_NOTIFY_STOP
:
426 ret
= mei_cl_irq_notify(cl
, cb
, cmpl_list
);
435 /* complete write list CB */
436 dev_dbg(dev
->dev
, "complete write list cb.\n");
437 list_for_each_entry_safe(cb
, next
, &dev
->write_list
.list
, list
) {
439 if (cl
== &dev
->iamthif_cl
)
440 ret
= mei_amthif_irq_write(cl
, cb
, cmpl_list
);
442 ret
= mei_cl_irq_write(cl
, cb
, cmpl_list
);
448 EXPORT_SYMBOL_GPL(mei_irq_write_handler
);
452 * mei_connect_timeout - connect/disconnect timeouts
456 static void mei_connect_timeout(struct mei_cl
*cl
)
458 struct mei_device
*dev
= cl
->dev
;
460 if (cl
->state
== MEI_FILE_CONNECTING
) {
461 if (dev
->hbm_f_dot_supported
) {
462 cl
->state
= MEI_FILE_DISCONNECT_REQUIRED
;
471 * mei_timer - timer function.
473 * @work: pointer to the work_struct structure
476 void mei_timer(struct work_struct
*work
)
480 struct mei_device
*dev
= container_of(work
,
481 struct mei_device
, timer_work
.work
);
484 mutex_lock(&dev
->device_lock
);
486 /* Catch interrupt stalls during HBM init handshake */
487 if (dev
->dev_state
== MEI_DEV_INIT_CLIENTS
&&
488 dev
->hbm_state
!= MEI_HBM_IDLE
) {
490 if (dev
->init_clients_timer
) {
491 if (--dev
->init_clients_timer
== 0) {
492 dev_err(dev
->dev
, "timer: init clients timeout hbm_state = %d.\n",
500 if (dev
->dev_state
!= MEI_DEV_ENABLED
)
503 /*** connect/disconnect timeouts ***/
504 list_for_each_entry(cl
, &dev
->file_list
, link
) {
505 if (cl
->timer_count
) {
506 if (--cl
->timer_count
== 0) {
507 dev_err(dev
->dev
, "timer: connect/disconnect timeout.\n");
508 mei_connect_timeout(cl
);
514 if (!mei_cl_is_connected(&dev
->iamthif_cl
))
517 if (dev
->iamthif_stall_timer
) {
518 if (--dev
->iamthif_stall_timer
== 0) {
519 dev_err(dev
->dev
, "timer: amthif hanged.\n");
521 dev
->iamthif_canceled
= false;
522 dev
->iamthif_state
= MEI_IAMTHIF_IDLE
;
524 mei_io_cb_free(dev
->iamthif_current_cb
);
525 dev
->iamthif_current_cb
= NULL
;
527 dev
->iamthif_fp
= NULL
;
528 mei_amthif_run_next_cmd(dev
);
533 if (dev
->dev_state
!= MEI_DEV_DISABLED
)
534 schedule_delayed_work(&dev
->timer_work
, 2 * HZ
);
535 mutex_unlock(&dev
->device_lock
);