summaryrefslogtreecommitdiff
path: root/drivers/misc/mei/interrupt.c
blob: 206dbe99bedda569b81123e082c3ed1a92d084b0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
/*
 *
 * Intel Management Engine Interface (Intel MEI) Linux driver
 * Copyright (c) 2003-2012, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */


#include <linux/export.h>
#include <linux/pci.h>
#include <linux/kthread.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/jiffies.h>

#include <linux/mei.h>

#include "mei_dev.h"
#include "hbm.h"
#include "hw-me.h"
#include "client.h"


/**
 * mei_irq_compl_handler - dispatch complete handelers
 *	for the completed callbacks
 *
 * @dev - mei device
 * @compl_list - list of completed cbs
 */
void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *compl_list)
{
	struct mei_cl_cb *cb, *next;
	struct mei_cl *cl;

	list_for_each_entry_safe(cb, next, &compl_list->list, list) {
		cl = cb->cl;
		list_del(&cb->list);
		if (!cl)
			continue;

		dev_dbg(&dev->pdev->dev, "completing call back.\n");
		if (cl == &dev->iamthif_cl)
			mei_amthif_complete(dev, cb);
		else
			mei_cl_complete(cl, cb);
	}
}
EXPORT_SYMBOL_GPL(mei_irq_compl_handler);

/**
 * mei_cl_hbm_equal - check if hbm is addressed to the client
 *
 * @cl: host client
 * @mei_hdr: header of mei client message
 *
 * returns true if matches, false otherwise
 */
static inline int mei_cl_hbm_equal(struct mei_cl *cl,
			struct mei_msg_hdr *mei_hdr)
{
	return cl->host_client_id == mei_hdr->host_addr &&
		cl->me_client_id == mei_hdr->me_addr;
}
/**
 * mei_cl_is_reading - checks if the client
		is the one to read this message
 *
 * @cl: mei client
 * @mei_hdr: header of mei message
 *
 * returns true on match and false otherwise
 */
static bool mei_cl_is_reading(struct mei_cl *cl, struct mei_msg_hdr *mei_hdr)
{
	return mei_cl_hbm_equal(cl, mei_hdr) &&
		cl->state == MEI_FILE_CONNECTED &&
		cl->reading_state != MEI_READ_COMPLETE;
}

/**
 * mei_irq_read_client_message - process client message
 *
 * @dev: the device structure
 * @mei_hdr: header of mei client message
 * @complete_list: An instance of our list structure
 *
 * returns 0 on success, <0 on failure.
 */
static int mei_cl_irq_read_msg(struct mei_device *dev,
			       struct mei_msg_hdr *mei_hdr,
			       struct mei_cl_cb *complete_list)
{
	struct mei_cl *cl;
	struct mei_cl_cb *cb, *next;
	unsigned char *buffer = NULL;

	list_for_each_entry_safe(cb, next, &dev->read_list.list, list) {
		cl = cb->cl;
		if (!cl || !mei_cl_is_reading(cl, mei_hdr))
			continue;

		cl->reading_state = MEI_READING;

		if (cb->response_buffer.size == 0 ||
		    cb->response_buffer.data == NULL) {
			cl_err(dev, cl, "response buffer is not allocated.\n");
			list_del(&cb->list);
			return -ENOMEM;
		}

		if (cb->response_buffer.size < mei_hdr->length + cb->buf_idx) {
			cl_dbg(dev, cl, "message overflow. size %d len %d idx %ld\n",
				cb->response_buffer.size,
				mei_hdr->length, cb->buf_idx);
			buffer = krealloc(cb->response_buffer.data,
					  mei_hdr->length + cb->buf_idx,
					  GFP_KERNEL);

			if (!buffer) {
				cl_err(dev, cl, "allocation failed.\n");
				list_del(&cb->list);
				return -ENOMEM;
			}
			cb->response_buffer.data = buffer;
			cb->response_buffer.size =
				mei_hdr->length + cb->buf_idx;
		}

		buffer = cb->response_buffer.data + cb->buf_idx;
		mei_read_slots(dev, buffer, mei_hdr->length);

		cb->buf_idx += mei_hdr->length;
		if (mei_hdr->msg_complete) {
			cl->status = 0;
			list_del(&cb->list);
			cl_dbg(dev, cl, "completed read length = %lu\n",
				cb->buf_idx);
			list_add_tail(&cb->list, &complete_list->list);
		}
		break;
	}

	dev_dbg(&dev->pdev->dev, "message read\n");
	if (!buffer) {
		mei_read_slots(dev, dev->rd_msg_buf, mei_hdr->length);
		dev_dbg(&dev->pdev->dev, "discarding message " MEI_HDR_FMT "\n",
				MEI_HDR_PRM(mei_hdr));
	}

	return 0;
}

/**
 * mei_cl_irq_close - processes close related operation from
 *	interrupt thread context - send disconnect request
 *
 * @cl: client
 * @cb: callback block.
 * @slots: free slots.
 * @cmpl_list: complete list.
 *
 * returns 0, OK; otherwise, error.
 */
static int mei_cl_irq_close(struct mei_cl *cl, struct mei_cl_cb *cb,
			s32 *slots, struct mei_cl_cb *cmpl_list)
{
	struct mei_device *dev = cl->dev;

	u32 msg_slots =
		mei_data2slots(sizeof(struct hbm_client_connect_request));

	if (*slots < msg_slots)
		return -EMSGSIZE;

	*slots -= msg_slots;

	if (mei_hbm_cl_disconnect_req(dev, cl)) {
		cl->status = 0;
		cb->buf_idx = 0;
		list_move_tail(&cb->list, &cmpl_list->list);
		return -EIO;
	}

	cl->state = MEI_FILE_DISCONNECTING;
	cl->status = 0;
	cb->buf_idx = 0;
	list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
	cl->timer_count = MEI_CONNECT_TIMEOUT;

	return 0;
}


/**
 * mei_cl_irq_close - processes client read related operation from the
 *	interrupt thread context - request for flow control credits
 *
 * @cl: client
 * @cb: callback block.
 * @slots: free slots.
 * @cmpl_list: complete list.
 *
 * returns 0, OK; otherwise, error.
 */
static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
			   s32 *slots, struct mei_cl_cb *cmpl_list)
{
	struct mei_device *dev = cl->dev;
	u32 msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));

	int ret;


	if (*slots < msg_slots) {
		/* return the cancel routine */
		list_del(&cb->list);
		return -EMSGSIZE;
	}

	*slots -= msg_slots;

	ret = mei_hbm_cl_flow_control_req(dev, cl);
	if (ret) {
		cl->status = ret;
		cb->buf_idx = 0;
		list_move_tail(&cb->list, &cmpl_list->list);
		return ret;
	}

	list_move_tail(&cb->list, &dev->read_list.list);

	return 0;
}


/**
 * mei_cl_irq_ioctl - processes client ioctl related operation from the
 *	interrupt thread context -   send connection request
 *
 * @cl: client
 * @cb: callback block.
 * @slots: free slots.
 * @cmpl_list: complete list.
 *
 * returns 0, OK; otherwise, error.
 */
static int mei_cl_irq_ioctl(struct mei_cl *cl, struct mei_cl_cb *cb,
			   s32 *slots, struct mei_cl_cb *cmpl_list)
{
	struct mei_device *dev = cl->dev;
	int ret;

	u32 msg_slots =
		mei_data2slots(sizeof(struct hbm_client_connect_request));

	if (*slots < msg_slots) {
		/* return the cancel routine */
		list_del(&cb->list);
		return -EMSGSIZE;
	}

	*slots -=  msg_slots;

	cl->state = MEI_FILE_CONNECTING;

	ret = mei_hbm_cl_connect_req(dev, cl);
	if (ret) {
		cl->status = ret;
		cb->buf_idx = 0;
		list_del(&cb->list);
		return ret;
	}

	list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
	cl->timer_count = MEI_CONNECT_TIMEOUT;
	return 0;
}


/**
 * mei_irq_read_handler - bottom half read routine after ISR to
 * handle the read processing.
 *
 * @dev: the device structure
 * @cmpl_list: An instance of our list structure
 * @slots: slots to read.
 *
 * returns 0 on success, <0 on failure.
 */
int mei_irq_read_handler(struct mei_device *dev,
		struct mei_cl_cb *cmpl_list, s32 *slots)
{
	struct mei_msg_hdr *mei_hdr;
	struct mei_cl *cl;
	int ret;

	if (!dev->rd_msg_hdr) {
		dev->rd_msg_hdr = mei_read_hdr(dev);
		(*slots)--;
		dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
	}
	mei_hdr = (struct mei_msg_hdr *) &dev->rd_msg_hdr;
	dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));

	if (mei_hdr->reserved || !dev->rd_msg_hdr) {
		dev_err(&dev->pdev->dev, "corrupted message header 0x%08X\n",
				dev->rd_msg_hdr);
		ret = -EBADMSG;
		goto end;
	}

	if (mei_slots2data(*slots) < mei_hdr->length) {
		dev_err(&dev->pdev->dev, "less data available than length=%08x.\n",
				*slots);
		/* we can't read the message */
		ret = -ERANGE;
		goto end;
	}

	/*  HBM message */
	if (mei_hdr->host_addr == 0 && mei_hdr->me_addr == 0) {
		ret = mei_hbm_dispatch(dev, mei_hdr);
		if (ret) {
			dev_dbg(&dev->pdev->dev, "mei_hbm_dispatch failed ret = %d\n",
					ret);
			goto end;
		}
		goto reset_slots;
	}

	/* find recepient cl */
	list_for_each_entry(cl, &dev->file_list, link) {
		if (mei_cl_hbm_equal(cl, mei_hdr)) {
			cl_dbg(dev, cl, "got a message\n");
			break;
		}
	}

	/* if no recepient cl was found we assume corrupted header\n */
	if (&cl->link == &dev->file_list) {
		dev_err(&dev->pdev->dev, "no destination client found 0x%08X\n",
				dev->rd_msg_hdr);
		ret = -EBADMSG;
		goto end;
	}

	if (mei_hdr->host_addr == dev->iamthif_cl.host_client_id &&
	    MEI_FILE_CONNECTED == dev->iamthif_cl.state &&
	    dev->iamthif_state == MEI_IAMTHIF_READING) {

		ret = mei_amthif_irq_read_msg(dev, mei_hdr, cmpl_list);
		if (ret) {
			dev_err(&dev->pdev->dev, "mei_amthif_irq_read_msg failed = %d\n",
					ret);
			goto end;
		}
	} else {
		ret = mei_cl_irq_read_msg(dev, mei_hdr, cmpl_list);
		if (ret) {
			dev_err(&dev->pdev->dev, "mei_cl_irq_read_msg failed = %d\n",
					ret);
			goto end;
		}
	}

reset_slots:
	/* reset the number of slots and header */
	*slots = mei_count_full_read_slots(dev);
	dev->rd_msg_hdr = 0;

	if (*slots == -EOVERFLOW) {
		/* overflow - reset */
		dev_err(&dev->pdev->dev, "resetting due to slots overflow.\n");
		/* set the event since message has been read */
		ret = -ERANGE;
		goto end;
	}
end:
	return ret;
}
EXPORT_SYMBOL_GPL(mei_irq_read_handler);


/**
 * mei_irq_write_handler -  dispatch write requests
 *  after irq received
 *
 * @dev: the device structure
 * @cmpl_list: An instance of our list structure
 *
 * returns 0 on success, <0 on failure.
 */
int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
{

	struct mei_cl *cl;
	struct mei_cl_cb *cb, *next;
	struct mei_cl_cb *list;
	s32 slots;
	int ret;

	if (!mei_hbuf_is_ready(dev)) {
		dev_dbg(&dev->pdev->dev, "host buffer is not empty.\n");
		return 0;
	}
	slots = mei_hbuf_empty_slots(dev);
	if (slots <= 0)
		return -EMSGSIZE;

	/* complete all waiting for write CB */
	dev_dbg(&dev->pdev->dev, "complete all waiting for write cb.\n");

	list = &dev->write_waiting_list;
	list_for_each_entry_safe(cb, next, &list->list, list) {
		cl = cb->cl;
		if (cl == NULL)
			continue;

		cl->status = 0;
		list_del(&cb->list);
		if (MEI_WRITING == cl->writing_state &&
		    cb->fop_type == MEI_FOP_WRITE &&
		    cl != &dev->iamthif_cl) {
			cl_dbg(dev, cl, "MEI WRITE COMPLETE\n");
			cl->writing_state = MEI_WRITE_COMPLETE;
			list_add_tail(&cb->list, &cmpl_list->list);
		}
		if (cl == &dev->iamthif_cl) {
			cl_dbg(dev, cl, "check iamthif flow control.\n");
			if (dev->iamthif_flow_control_pending) {
				ret = mei_amthif_irq_read(dev, &slots);
				if (ret)
					return ret;
			}
		}
	}

	if (dev->wd_state == MEI_WD_STOPPING) {
		dev->wd_state = MEI_WD_IDLE;
		wake_up_interruptible(&dev->wait_stop_wd);
	}

	if (dev->wr_ext_msg.hdr.length) {
		mei_write_message(dev, &dev->wr_ext_msg.hdr,
				dev->wr_ext_msg.data);
		slots -= mei_data2slots(dev->wr_ext_msg.hdr.length);
		dev->wr_ext_msg.hdr.length = 0;
	}
	if (dev->dev_state == MEI_DEV_ENABLED) {
		if (dev->wd_pending &&
		    mei_cl_flow_ctrl_creds(&dev->wd_cl) > 0) {
			if (mei_wd_send(dev))
				dev_dbg(&dev->pdev->dev, "wd send failed.\n");
			else if (mei_cl_flow_ctrl_reduce(&dev->wd_cl))
				return -ENODEV;

			dev->wd_pending = false;

			if (dev->wd_state == MEI_WD_RUNNING)
				slots -= mei_data2slots(MEI_WD_START_MSG_SIZE);
			else
				slots -= mei_data2slots(MEI_WD_STOP_MSG_SIZE);
		}
	}

	/* complete control write list CB */
	dev_dbg(&dev->pdev->dev, "complete control write list cb.\n");
	list_for_each_entry_safe(cb, next, &dev->ctrl_wr_list.list, list) {
		cl = cb->cl;
		if (!cl) {
			list_del(&cb->list);
			return -ENODEV;
		}
		switch (cb->fop_type) {
		case MEI_FOP_CLOSE:
			/* send disconnect message */
			ret = mei_cl_irq_close(cl, cb, &slots, cmpl_list);
			if (ret)
				return ret;

			break;
		case MEI_FOP_READ:
			/* send flow control message */
			ret = mei_cl_irq_read(cl, cb, &slots, cmpl_list);
			if (ret)
				return ret;

			break;
		case MEI_FOP_IOCTL:
			/* connect message */
			if (mei_cl_is_other_connecting(cl))
				continue;
			ret = mei_cl_irq_ioctl(cl, cb, &slots, cmpl_list);
			if (ret)
				return ret;

			break;

		default:
			BUG();
		}

	}
	/* complete  write list CB */
	dev_dbg(&dev->pdev->dev, "complete write list cb.\n");
	list_for_each_entry_safe(cb, next, &dev->write_list.list, list) {
		cl = cb->cl;
		if (cl == NULL)
			continue;
		if (cl == &dev->iamthif_cl)
			ret = mei_amthif_irq_write_complete(cl, cb,
						&slots, cmpl_list);
		else
			ret = mei_cl_irq_write_complete(cl, cb,
						&slots, cmpl_list);
		if (ret)
			return ret;
	}
	return 0;
}
EXPORT_SYMBOL_GPL(mei_irq_write_handler);



/**
 * mei_timer - timer function.
 *
 * @work: pointer to the work_struct structure
 *
 */
void mei_timer(struct work_struct *work)
{
	unsigned long timeout;
	struct mei_cl *cl_pos = NULL;
	struct mei_cl *cl_next = NULL;
	struct mei_cl_cb  *cb_pos = NULL;
	struct mei_cl_cb  *cb_next = NULL;

	struct mei_device *dev = container_of(work,
					struct mei_device, timer_work.work);


	mutex_lock(&dev->device_lock);

	/* Catch interrupt stalls during HBM init handshake */
	if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
	    dev->hbm_state != MEI_HBM_IDLE) {

		if (dev->init_clients_timer) {
			if (--dev->init_clients_timer == 0) {
				dev_err(&dev->pdev->dev, "timer: init clients timeout hbm_state = %d.\n",
					dev->hbm_state);
				mei_reset(dev, 1);
				goto out;
			}
		}
	}

	if (dev->dev_state != MEI_DEV_ENABLED)
		goto out;

	/*** connect/disconnect timeouts ***/
	list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
		if (cl_pos->timer_count) {
			if (--cl_pos->timer_count == 0) {
				dev_err(&dev->pdev->dev, "reset: connect/disconnect timeout.\n");
				mei_reset(dev, 1);
				goto out;
			}
		}
	}

	if (dev->iamthif_stall_timer) {
		if (--dev->iamthif_stall_timer == 0) {
			dev_err(&dev->pdev->dev, "reset: amthif  hanged.\n");
			mei_reset(dev, 1);
			dev->iamthif_msg_buf_size = 0;
			dev->iamthif_msg_buf_index = 0;
			dev->iamthif_canceled = false;
			dev->iamthif_ioctl = true;
			dev->iamthif_state = MEI_IAMTHIF_IDLE;
			dev->iamthif_timer = 0;

			mei_io_cb_free(dev->iamthif_current_cb);
			dev->iamthif_current_cb = NULL;

			dev->iamthif_file_object = NULL;
			mei_amthif_run_next_cmd(dev);
		}
	}

	if (dev->iamthif_timer) {

		timeout = dev->iamthif_timer +
			mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);

		dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
				dev->iamthif_timer);
		dev_dbg(&dev->pdev->dev, "timeout = %ld\n", timeout);
		dev_dbg(&dev->pdev->dev, "jiffies = %ld\n", jiffies);
		if (time_after(jiffies, timeout)) {
			/*
			 * User didn't read the AMTHI data on time (15sec)
			 * freeing AMTHI for other requests
			 */

			dev_dbg(&dev->pdev->dev, "freeing AMTHI for other requests\n");

			list_for_each_entry_safe(cb_pos, cb_next,
				&dev->amthif_rd_complete_list.list, list) {

				cl_pos = cb_pos->file_object->private_data;

				/* Finding the AMTHI entry. */
				if (cl_pos == &dev->iamthif_cl)
					list_del(&cb_pos->list);
			}
			mei_io_cb_free(dev->iamthif_current_cb);
			dev->iamthif_current_cb = NULL;

			dev->iamthif_file_object->private_data = NULL;
			dev->iamthif_file_object = NULL;
			dev->iamthif_timer = 0;
			mei_amthif_run_next_cmd(dev);

		}
	}
out:
	schedule_delayed_work(&dev->timer_work, 2 * HZ);
	mutex_unlock(&dev->device_lock);
}