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 handelers
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_close - processes close related operation from
165 * interrupt thread context - send disconnect request
168 * @cb: callback block.
169 * @slots: free slots.
170 * @cmpl_list: complete list.
172 * returns 0, OK; otherwise, error.
174 static int mei_cl_irq_close(struct mei_cl *cl, struct mei_cl_cb *cb,
175 s32 *slots, struct mei_cl_cb *cmpl_list)
177 struct mei_device *dev = cl->dev;
180 mei_data2slots(sizeof(struct hbm_client_connect_request));
182 if (*slots < msg_slots)
187 if (mei_hbm_cl_disconnect_req(dev, cl)) {
190 list_move_tail(&cb->list, &cmpl_list->list);
194 cl->state = MEI_FILE_DISCONNECTING;
197 list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
198 cl->timer_count = MEI_CONNECT_TIMEOUT;
205 * mei_cl_irq_close - processes client read related operation from the
206 * interrupt thread context - request for flow control credits
209 * @cb: callback block.
210 * @slots: free slots.
211 * @cmpl_list: complete list.
213 * returns 0, OK; otherwise, error.
215 static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
216 s32 *slots, struct mei_cl_cb *cmpl_list)
218 struct mei_device *dev = cl->dev;
219 u32 msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));
224 if (*slots < msg_slots) {
225 /* return the cancel routine */
232 ret = mei_hbm_cl_flow_control_req(dev, cl);
236 list_move_tail(&cb->list, &cmpl_list->list);
240 list_move_tail(&cb->list, &dev->read_list.list);
247 * mei_cl_irq_ioctl - processes client ioctl related operation from the
248 * interrupt thread context - send connection request
251 * @cb: callback block.
252 * @slots: free slots.
253 * @cmpl_list: complete list.
255 * returns 0, OK; otherwise, error.
257 static int mei_cl_irq_ioctl(struct mei_cl *cl, struct mei_cl_cb *cb,
258 s32 *slots, struct mei_cl_cb *cmpl_list)
260 struct mei_device *dev = cl->dev;
264 mei_data2slots(sizeof(struct hbm_client_connect_request));
266 if (*slots < msg_slots) {
267 /* return the cancel routine */
274 cl->state = MEI_FILE_CONNECTING;
276 ret = mei_hbm_cl_connect_req(dev, cl);
284 list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
285 cl->timer_count = MEI_CONNECT_TIMEOUT;
291 * mei_irq_read_handler - bottom half read routine after ISR to
292 * handle the read processing.
294 * @dev: the device structure
295 * @cmpl_list: An instance of our list structure
296 * @slots: slots to read.
298 * returns 0 on success, <0 on failure.
300 int mei_irq_read_handler(struct mei_device *dev,
301 struct mei_cl_cb *cmpl_list, s32 *slots)
303 struct mei_msg_hdr *mei_hdr;
307 if (!dev->rd_msg_hdr) {
308 dev->rd_msg_hdr = mei_read_hdr(dev);
310 dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
312 mei_hdr = (struct mei_msg_hdr *) &dev->rd_msg_hdr;
313 dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
315 if (mei_hdr->reserved || !dev->rd_msg_hdr) {
316 dev_err(&dev->pdev->dev, "corrupted message header 0x%08X\n",
322 if (mei_slots2data(*slots) < mei_hdr->length) {
323 dev_err(&dev->pdev->dev, "less data available than length=%08x.\n",
325 /* we can't read the message */
331 if (mei_hdr->host_addr == 0 && mei_hdr->me_addr == 0) {
332 ret = mei_hbm_dispatch(dev, mei_hdr);
334 dev_dbg(&dev->pdev->dev, "mei_hbm_dispatch failed ret = %d\n",
341 /* find recepient cl */
342 list_for_each_entry(cl, &dev->file_list, link) {
343 if (mei_cl_hbm_equal(cl, mei_hdr)) {
344 cl_dbg(dev, cl, "got a message\n");
349 /* if no recepient cl was found we assume corrupted header\n */
350 if (&cl->link == &dev->file_list) {
351 dev_err(&dev->pdev->dev, "no destination client found 0x%08X\n",
357 if (mei_hdr->host_addr == dev->iamthif_cl.host_client_id &&
358 MEI_FILE_CONNECTED == dev->iamthif_cl.state &&
359 dev->iamthif_state == MEI_IAMTHIF_READING) {
361 ret = mei_amthif_irq_read_msg(dev, mei_hdr, cmpl_list);
363 dev_err(&dev->pdev->dev, "mei_amthif_irq_read_msg failed = %d\n",
368 ret = mei_cl_irq_read_msg(dev, mei_hdr, cmpl_list);
370 dev_err(&dev->pdev->dev, "mei_cl_irq_read_msg failed = %d\n",
377 /* reset the number of slots and header */
378 *slots = mei_count_full_read_slots(dev);
381 if (*slots == -EOVERFLOW) {
382 /* overflow - reset */
383 dev_err(&dev->pdev->dev, "resetting due to slots overflow.\n");
384 /* set the event since message has been read */
391 EXPORT_SYMBOL_GPL(mei_irq_read_handler);
395 * mei_irq_write_handler - dispatch write requests
398 * @dev: the device structure
399 * @cmpl_list: An instance of our list structure
401 * returns 0 on success, <0 on failure.
403 int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
407 struct mei_cl_cb *cb, *next;
408 struct mei_cl_cb *list;
412 if (!mei_hbuf_is_ready(dev)) {
413 dev_dbg(&dev->pdev->dev, "host buffer is not empty.\n");
416 slots = mei_hbuf_empty_slots(dev);
420 /* complete all waiting for write CB */
421 dev_dbg(&dev->pdev->dev, "complete all waiting for write cb.\n");
423 list = &dev->write_waiting_list;
424 list_for_each_entry_safe(cb, next, &list->list, list) {
431 if (MEI_WRITING == cl->writing_state &&
432 cb->fop_type == MEI_FOP_WRITE &&
433 cl != &dev->iamthif_cl) {
434 cl_dbg(dev, cl, "MEI WRITE COMPLETE\n");
435 cl->writing_state = MEI_WRITE_COMPLETE;
436 list_add_tail(&cb->list, &cmpl_list->list);
438 if (cl == &dev->iamthif_cl) {
439 cl_dbg(dev, cl, "check iamthif flow control.\n");
440 if (dev->iamthif_flow_control_pending) {
441 ret = mei_amthif_irq_read(dev, &slots);
448 if (dev->wd_state == MEI_WD_STOPPING) {
449 dev->wd_state = MEI_WD_IDLE;
450 wake_up_interruptible(&dev->wait_stop_wd);
453 if (dev->wr_ext_msg.hdr.length) {
454 mei_write_message(dev, &dev->wr_ext_msg.hdr,
455 dev->wr_ext_msg.data);
456 slots -= mei_data2slots(dev->wr_ext_msg.hdr.length);
457 dev->wr_ext_msg.hdr.length = 0;
459 if (dev->dev_state == MEI_DEV_ENABLED) {
460 if (dev->wd_pending &&
461 mei_cl_flow_ctrl_creds(&dev->wd_cl) > 0) {
462 if (mei_wd_send(dev))
463 dev_dbg(&dev->pdev->dev, "wd send failed.\n");
464 else if (mei_cl_flow_ctrl_reduce(&dev->wd_cl))
467 dev->wd_pending = false;
469 if (dev->wd_state == MEI_WD_RUNNING)
470 slots -= mei_data2slots(MEI_WD_START_MSG_SIZE);
472 slots -= mei_data2slots(MEI_WD_STOP_MSG_SIZE);
476 /* complete control write list CB */
477 dev_dbg(&dev->pdev->dev, "complete control write list cb.\n");
478 list_for_each_entry_safe(cb, next, &dev->ctrl_wr_list.list, list) {
484 switch (cb->fop_type) {
486 /* send disconnect message */
487 ret = mei_cl_irq_close(cl, cb, &slots, cmpl_list);
493 /* send flow control message */
494 ret = mei_cl_irq_read(cl, cb, &slots, cmpl_list);
500 /* connect message */
501 if (mei_cl_is_other_connecting(cl))
503 ret = mei_cl_irq_ioctl(cl, cb, &slots, cmpl_list);
514 /* complete write list CB */
515 dev_dbg(&dev->pdev->dev, "complete write list cb.\n");
516 list_for_each_entry_safe(cb, next, &dev->write_list.list, list) {
520 if (cl == &dev->iamthif_cl)
521 ret = mei_amthif_irq_write_complete(cl, cb,
524 ret = mei_cl_irq_write_complete(cl, cb,
531 EXPORT_SYMBOL_GPL(mei_irq_write_handler);
536 * mei_timer - timer function.
538 * @work: pointer to the work_struct structure
541 void mei_timer(struct work_struct *work)
543 unsigned long timeout;
544 struct mei_cl *cl_pos = NULL;
545 struct mei_cl *cl_next = NULL;
546 struct mei_cl_cb *cb_pos = NULL;
547 struct mei_cl_cb *cb_next = NULL;
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->pdev->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_safe(cl_pos, cl_next, &dev->file_list, link) {
574 if (cl_pos->timer_count) {
575 if (--cl_pos->timer_count == 0) {
576 dev_err(&dev->pdev->dev, "reset: connect/disconnect timeout.\n");
583 if (dev->iamthif_stall_timer) {
584 if (--dev->iamthif_stall_timer == 0) {
585 dev_err(&dev->pdev->dev, "reset: amthif hanged.\n");
587 dev->iamthif_msg_buf_size = 0;
588 dev->iamthif_msg_buf_index = 0;
589 dev->iamthif_canceled = false;
590 dev->iamthif_ioctl = true;
591 dev->iamthif_state = MEI_IAMTHIF_IDLE;
592 dev->iamthif_timer = 0;
594 mei_io_cb_free(dev->iamthif_current_cb);
595 dev->iamthif_current_cb = NULL;
597 dev->iamthif_file_object = NULL;
598 mei_amthif_run_next_cmd(dev);
602 if (dev->iamthif_timer) {
604 timeout = dev->iamthif_timer +
605 mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
607 dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
609 dev_dbg(&dev->pdev->dev, "timeout = %ld\n", timeout);
610 dev_dbg(&dev->pdev->dev, "jiffies = %ld\n", jiffies);
611 if (time_after(jiffies, timeout)) {
613 * User didn't read the AMTHI data on time (15sec)
614 * freeing AMTHI for other requests
617 dev_dbg(&dev->pdev->dev, "freeing AMTHI for other requests\n");
619 list_for_each_entry_safe(cb_pos, cb_next,
620 &dev->amthif_rd_complete_list.list, list) {
622 cl_pos = cb_pos->file_object->private_data;
624 /* Finding the AMTHI entry. */
625 if (cl_pos == &dev->iamthif_cl)
626 list_del(&cb_pos->list);
628 mei_io_cb_free(dev->iamthif_current_cb);
629 dev->iamthif_current_cb = NULL;
631 dev->iamthif_file_object->private_data = NULL;
632 dev->iamthif_file_object = NULL;
633 dev->iamthif_timer = 0;
634 mei_amthif_run_next_cmd(dev);
639 schedule_delayed_work(&dev->timer_work, 2 * HZ);
640 mutex_unlock(&dev->device_lock);