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/pci.h>
20 #include <linux/kthread.h>
21 #include <linux/interrupt.h>
23 #include <linux/jiffies.h>
25 #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) {
51 dev_dbg(&dev->pdev->dev, "completing call back.\n");
52 if (cl == &dev->iamthif_cl)
53 mei_amthif_complete(dev, cb);
55 mei_cl_complete(cl, cb);
58 EXPORT_SYMBOL_GPL(mei_irq_compl_handler);
61 * mei_cl_hbm_equal - check if hbm is addressed to the client
64 * @mei_hdr: header of mei client message
66 * returns true if matches, false otherwise
68 static inline int mei_cl_hbm_equal(struct mei_cl *cl,
69 struct mei_msg_hdr *mei_hdr)
71 return cl->host_client_id == mei_hdr->host_addr &&
72 cl->me_client_id == mei_hdr->me_addr;
75 * mei_cl_is_reading - checks if the client
76 is the one to read this message
79 * @mei_hdr: header of mei message
81 * returns true on match and false otherwise
83 static bool mei_cl_is_reading(struct mei_cl *cl, struct mei_msg_hdr *mei_hdr)
85 return mei_cl_hbm_equal(cl, mei_hdr) &&
86 cl->state == MEI_FILE_CONNECTED &&
87 cl->reading_state != MEI_READ_COMPLETE;
91 * mei_irq_read_client_message - process client message
93 * @dev: the device structure
94 * @mei_hdr: header of mei client message
95 * @complete_list: An instance of our list structure
97 * returns 0 on success, <0 on failure.
99 static int mei_cl_irq_read_msg(struct mei_device *dev,
100 struct mei_msg_hdr *mei_hdr,
101 struct mei_cl_cb *complete_list)
104 struct mei_cl_cb *cb, *next;
105 unsigned char *buffer = NULL;
107 list_for_each_entry_safe(cb, next, &dev->read_list.list, list) {
109 if (!cl || !mei_cl_is_reading(cl, mei_hdr))
112 cl->reading_state = MEI_READING;
114 if (cb->response_buffer.size == 0 ||
115 cb->response_buffer.data == NULL) {
116 cl_err(dev, cl, "response buffer is not allocated.\n");
121 if (cb->response_buffer.size < mei_hdr->length + cb->buf_idx) {
122 cl_dbg(dev, cl, "message overflow. size %d len %d idx %ld\n",
123 cb->response_buffer.size,
124 mei_hdr->length, cb->buf_idx);
125 buffer = krealloc(cb->response_buffer.data,
126 mei_hdr->length + cb->buf_idx,
130 cl_err(dev, cl, "allocation failed.\n");
134 cb->response_buffer.data = buffer;
135 cb->response_buffer.size =
136 mei_hdr->length + cb->buf_idx;
139 buffer = cb->response_buffer.data + cb->buf_idx;
140 mei_read_slots(dev, buffer, mei_hdr->length);
142 cb->buf_idx += mei_hdr->length;
143 if (mei_hdr->msg_complete) {
146 cl_dbg(dev, cl, "completed read length = %lu\n",
148 list_add_tail(&cb->list, &complete_list->list);
153 dev_dbg(&dev->pdev->dev, "message read\n");
155 mei_read_slots(dev, dev->rd_msg_buf, mei_hdr->length);
156 dev_dbg(&dev->pdev->dev, "discarding message " MEI_HDR_FMT "\n",
157 MEI_HDR_PRM(mei_hdr));
164 * mei_cl_irq_disconnect_rsp - send disconnection response message
167 * @cb: callback block.
168 * @cmpl_list: complete list.
170 * returns 0, OK; otherwise, error.
172 static int mei_cl_irq_disconnect_rsp(struct mei_cl *cl, struct mei_cl_cb *cb,
173 struct mei_cl_cb *cmpl_list)
175 struct mei_device *dev = cl->dev;
180 slots = mei_hbuf_empty_slots(dev);
181 msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_response));
183 if (slots < msg_slots)
186 ret = mei_hbm_cl_disconnect_rsp(dev, cl);
188 cl->state = MEI_FILE_DISCONNECTED;
198 * mei_cl_irq_close - processes close related operation from
199 * interrupt thread context - send disconnect request
202 * @cb: callback block.
203 * @cmpl_list: complete list.
205 * returns 0, OK; otherwise, error.
207 static int mei_cl_irq_close(struct mei_cl *cl, struct mei_cl_cb *cb,
208 struct mei_cl_cb *cmpl_list)
210 struct mei_device *dev = cl->dev;
214 msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
215 slots = mei_hbuf_empty_slots(dev);
217 if (slots < msg_slots)
220 if (mei_hbm_cl_disconnect_req(dev, cl)) {
223 list_move_tail(&cb->list, &cmpl_list->list);
227 cl->state = MEI_FILE_DISCONNECTING;
230 list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
231 cl->timer_count = MEI_CONNECT_TIMEOUT;
238 * mei_cl_irq_close - processes client read related operation from the
239 * interrupt thread context - request for flow control credits
242 * @cb: callback block.
243 * @cmpl_list: complete list.
245 * returns 0, OK; otherwise, error.
247 static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
248 struct mei_cl_cb *cmpl_list)
250 struct mei_device *dev = cl->dev;
255 msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));
256 slots = mei_hbuf_empty_slots(dev);
258 if (slots < msg_slots)
261 ret = mei_hbm_cl_flow_control_req(dev, cl);
265 list_move_tail(&cb->list, &cmpl_list->list);
269 list_move_tail(&cb->list, &dev->read_list.list);
276 * mei_cl_irq_connect - send connect request in irq_thread context
279 * @cb: callback block.
280 * @cmpl_list: complete list.
282 * returns 0, OK; otherwise, error.
284 static int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
285 struct mei_cl_cb *cmpl_list)
287 struct mei_device *dev = cl->dev;
292 msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
293 slots = mei_hbuf_empty_slots(dev);
295 if (mei_cl_is_other_connecting(cl))
298 if (slots < msg_slots)
301 cl->state = MEI_FILE_CONNECTING;
303 ret = mei_hbm_cl_connect_req(dev, cl);
311 list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
312 cl->timer_count = MEI_CONNECT_TIMEOUT;
318 * mei_irq_read_handler - bottom half read routine after ISR to
319 * handle the read processing.
321 * @dev: the device structure
322 * @cmpl_list: An instance of our list structure
323 * @slots: slots to read.
325 * returns 0 on success, <0 on failure.
327 int mei_irq_read_handler(struct mei_device *dev,
328 struct mei_cl_cb *cmpl_list, s32 *slots)
330 struct mei_msg_hdr *mei_hdr;
334 if (!dev->rd_msg_hdr) {
335 dev->rd_msg_hdr = mei_read_hdr(dev);
337 dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
339 mei_hdr = (struct mei_msg_hdr *) &dev->rd_msg_hdr;
340 dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
342 if (mei_hdr->reserved || !dev->rd_msg_hdr) {
343 dev_err(&dev->pdev->dev, "corrupted message header 0x%08X\n",
349 if (mei_slots2data(*slots) < mei_hdr->length) {
350 dev_err(&dev->pdev->dev, "less data available than length=%08x.\n",
352 /* we can't read the message */
358 if (mei_hdr->host_addr == 0 && mei_hdr->me_addr == 0) {
359 ret = mei_hbm_dispatch(dev, mei_hdr);
361 dev_dbg(&dev->pdev->dev, "mei_hbm_dispatch failed ret = %d\n",
368 /* find recipient cl */
369 list_for_each_entry(cl, &dev->file_list, link) {
370 if (mei_cl_hbm_equal(cl, mei_hdr)) {
371 cl_dbg(dev, cl, "got a message\n");
376 /* if no recipient cl was found we assume corrupted header */
377 if (&cl->link == &dev->file_list) {
378 dev_err(&dev->pdev->dev, "no destination client found 0x%08X\n",
384 if (mei_hdr->host_addr == dev->iamthif_cl.host_client_id &&
385 MEI_FILE_CONNECTED == dev->iamthif_cl.state &&
386 dev->iamthif_state == MEI_IAMTHIF_READING) {
388 ret = mei_amthif_irq_read_msg(dev, mei_hdr, cmpl_list);
390 dev_err(&dev->pdev->dev, "mei_amthif_irq_read_msg failed = %d\n",
395 ret = mei_cl_irq_read_msg(dev, mei_hdr, cmpl_list);
397 dev_err(&dev->pdev->dev, "mei_cl_irq_read_msg failed = %d\n",
404 /* reset the number of slots and header */
405 *slots = mei_count_full_read_slots(dev);
408 if (*slots == -EOVERFLOW) {
409 /* overflow - reset */
410 dev_err(&dev->pdev->dev, "resetting due to slots overflow.\n");
411 /* set the event since message has been read */
418 EXPORT_SYMBOL_GPL(mei_irq_read_handler);
422 * mei_irq_write_handler - dispatch write requests
425 * @dev: the device structure
426 * @cmpl_list: An instance of our list structure
428 * returns 0 on success, <0 on failure.
430 int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
434 struct mei_cl_cb *cb, *next;
435 struct mei_cl_cb *list;
440 if (!mei_hbuf_acquire(dev))
443 slots = mei_hbuf_empty_slots(dev);
447 /* complete all waiting for write CB */
448 dev_dbg(&dev->pdev->dev, "complete all waiting for write cb.\n");
450 list = &dev->write_waiting_list;
451 list_for_each_entry_safe(cb, next, &list->list, list) {
458 if (MEI_WRITING == cl->writing_state &&
459 cb->fop_type == MEI_FOP_WRITE &&
460 cl != &dev->iamthif_cl) {
461 cl_dbg(dev, cl, "MEI WRITE COMPLETE\n");
462 cl->writing_state = MEI_WRITE_COMPLETE;
463 list_add_tail(&cb->list, &cmpl_list->list);
465 if (cl == &dev->iamthif_cl) {
466 cl_dbg(dev, cl, "check iamthif flow control.\n");
467 if (dev->iamthif_flow_control_pending) {
468 ret = mei_amthif_irq_read(dev, &slots);
475 if (dev->wd_state == MEI_WD_STOPPING) {
476 dev->wd_state = MEI_WD_IDLE;
477 wake_up_interruptible(&dev->wait_stop_wd);
480 if (mei_cl_is_connected(&dev->wd_cl)) {
481 if (dev->wd_pending &&
482 mei_cl_flow_ctrl_creds(&dev->wd_cl) > 0) {
483 if (mei_wd_send(dev))
484 dev_dbg(&dev->pdev->dev, "wd send failed.\n");
485 else if (mei_cl_flow_ctrl_reduce(&dev->wd_cl))
487 dev->wd_pending = false;
491 /* complete control write list CB */
492 dev_dbg(&dev->pdev->dev, "complete control write list cb.\n");
493 list_for_each_entry_safe(cb, next, &dev->ctrl_wr_list.list, list) {
499 switch (cb->fop_type) {
501 /* send disconnect message */
502 ret = mei_cl_irq_close(cl, cb, cmpl_list);
508 /* send flow control message */
509 ret = mei_cl_irq_read(cl, cb, cmpl_list);
514 case MEI_FOP_CONNECT:
515 /* connect message */
516 ret = mei_cl_irq_connect(cl, cb, cmpl_list);
521 case MEI_FOP_DISCONNECT_RSP:
522 /* send disconnect resp */
523 ret = mei_cl_irq_disconnect_rsp(cl, cb, cmpl_list);
531 /* complete write list CB */
532 dev_dbg(&dev->pdev->dev, "complete write list cb.\n");
533 list_for_each_entry_safe(cb, next, &dev->write_list.list, list) {
537 if (cl == &dev->iamthif_cl)
538 ret = mei_amthif_irq_write(cl, cb, cmpl_list);
540 ret = mei_cl_irq_write(cl, cb, cmpl_list);
546 EXPORT_SYMBOL_GPL(mei_irq_write_handler);
551 * mei_timer - timer function.
553 * @work: pointer to the work_struct structure
556 void mei_timer(struct work_struct *work)
558 unsigned long timeout;
560 struct mei_cl_cb *cb_pos = NULL;
561 struct mei_cl_cb *cb_next = NULL;
563 struct mei_device *dev = container_of(work,
564 struct mei_device, timer_work.work);
567 mutex_lock(&dev->device_lock);
569 /* Catch interrupt stalls during HBM init handshake */
570 if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
571 dev->hbm_state != MEI_HBM_IDLE) {
573 if (dev->init_clients_timer) {
574 if (--dev->init_clients_timer == 0) {
575 dev_err(&dev->pdev->dev, "timer: init clients timeout hbm_state = %d.\n",
583 if (dev->dev_state != MEI_DEV_ENABLED)
586 /*** connect/disconnect timeouts ***/
587 list_for_each_entry(cl, &dev->file_list, link) {
588 if (cl->timer_count) {
589 if (--cl->timer_count == 0) {
590 dev_err(&dev->pdev->dev, "timer: connect/disconnect timeout.\n");
597 if (!mei_cl_is_connected(&dev->iamthif_cl))
600 if (dev->iamthif_stall_timer) {
601 if (--dev->iamthif_stall_timer == 0) {
602 dev_err(&dev->pdev->dev, "timer: amthif hanged.\n");
604 dev->iamthif_msg_buf_size = 0;
605 dev->iamthif_msg_buf_index = 0;
606 dev->iamthif_canceled = false;
607 dev->iamthif_ioctl = true;
608 dev->iamthif_state = MEI_IAMTHIF_IDLE;
609 dev->iamthif_timer = 0;
611 mei_io_cb_free(dev->iamthif_current_cb);
612 dev->iamthif_current_cb = NULL;
614 dev->iamthif_file_object = NULL;
615 mei_amthif_run_next_cmd(dev);
619 if (dev->iamthif_timer) {
621 timeout = dev->iamthif_timer +
622 mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
624 dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
626 dev_dbg(&dev->pdev->dev, "timeout = %ld\n", timeout);
627 dev_dbg(&dev->pdev->dev, "jiffies = %ld\n", jiffies);
628 if (time_after(jiffies, timeout)) {
630 * User didn't read the AMTHI data on time (15sec)
631 * freeing AMTHI for other requests
634 dev_dbg(&dev->pdev->dev, "freeing AMTHI for other requests\n");
636 list_for_each_entry_safe(cb_pos, cb_next,
637 &dev->amthif_rd_complete_list.list, list) {
639 cl = cb_pos->file_object->private_data;
641 /* Finding the AMTHI entry. */
642 if (cl == &dev->iamthif_cl)
643 list_del(&cb_pos->list);
645 mei_io_cb_free(dev->iamthif_current_cb);
646 dev->iamthif_current_cb = NULL;
648 dev->iamthif_file_object->private_data = NULL;
649 dev->iamthif_file_object = NULL;
650 dev->iamthif_timer = 0;
651 mei_amthif_run_next_cmd(dev);
656 if (dev->dev_state != MEI_DEV_DISABLED)
657 schedule_delayed_work(&dev->timer_work, 2 * HZ);
658 mutex_unlock(&dev->device_lock);