aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/misc/mei/iorw.c
blob: 0a80dc4e62f3c3cc702e720d223bc0c14393ed70 (plain) (blame)
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
/*
 *
 * 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/kernel.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/aio.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ioctl.h>
#include <linux/cdev.h>
#include <linux/list.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/uuid.h>
#include <linux/jiffies.h>
#include <linux/uaccess.h>


#include "mei_dev.h"
#include "hw.h"
#include "mei.h"
#include "interface.h"



/**
 * mei_ioctl_connect_client - the connect to fw client IOCTL function
 *
 * @dev: the device structure
 * @data: IOCTL connect data, input and output parameters
 * @file: private data of the file object
 *
 * Locking: called under "dev->device_lock" lock
 *
 * returns 0 on success, <0 on failure.
 */
int mei_ioctl_connect_client(struct file *file,
			struct mei_connect_client_data *data)
{
	struct mei_device *dev;
	struct mei_cl_cb *cb;
	struct mei_client *client;
	struct mei_cl *cl;
	struct mei_cl *cl_pos = NULL;
	struct mei_cl *cl_next = NULL;
	long timeout = CONNECT_TIMEOUT;
	int i;
	int err;
	int rets;

	cl = file->private_data;
	if (WARN_ON(!cl || !cl->dev))
		return -ENODEV;

	dev = cl->dev;

	dev_dbg(&dev->pdev->dev, "mei_ioctl_connect_client() Entry\n");


	/* buffered ioctl cb */
	cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
	if (!cb) {
		rets = -ENOMEM;
		goto end;
	}
	INIT_LIST_HEAD(&cb->cb_list);

	cb->major_file_operations = MEI_IOCTL;

	if (dev->mei_state != MEI_ENABLED) {
		rets = -ENODEV;
		goto end;
	}
	if (cl->state != MEI_FILE_INITIALIZING &&
	    cl->state != MEI_FILE_DISCONNECTED) {
		rets = -EBUSY;
		goto end;
	}

	/* find ME client we're trying to connect to */
	i = mei_find_me_client_index(dev, data->in_client_uuid);
	if (i >= 0 && !dev->me_clients[i].props.fixed_address) {
		cl->me_client_id = dev->me_clients[i].client_id;
		cl->state = MEI_FILE_CONNECTING;
	}

	dev_dbg(&dev->pdev->dev, "Connect to FW Client ID = %d\n",
			cl->me_client_id);
	dev_dbg(&dev->pdev->dev, "FW Client - Protocol Version = %d\n",
			dev->me_clients[i].props.protocol_version);
	dev_dbg(&dev->pdev->dev, "FW Client - Max Msg Len = %d\n",
			dev->me_clients[i].props.max_msg_length);

	/* if we're connecting to amthi client then we will use the
	 * existing connection
	 */
	if (uuid_le_cmp(data->in_client_uuid, mei_amthi_guid) == 0) {
		dev_dbg(&dev->pdev->dev, "FW Client is amthi\n");
		if (dev->iamthif_cl.state != MEI_FILE_CONNECTED) {
			rets = -ENODEV;
			goto end;
		}
		clear_bit(cl->host_client_id, dev->host_clients_map);
		list_for_each_entry_safe(cl_pos, cl_next,
					 &dev->file_list, link) {
			if (mei_cl_cmp_id(cl, cl_pos)) {
				dev_dbg(&dev->pdev->dev,
					"remove file private data node host"
				    " client = %d, ME client = %d.\n",
				    cl_pos->host_client_id,
				    cl_pos->me_client_id);
				list_del(&cl_pos->link);
			}

		}
		dev_dbg(&dev->pdev->dev, "free file private data memory.\n");
		kfree(cl);

		cl = NULL;
		file->private_data = &dev->iamthif_cl;

		client = &data->out_client_properties;
		client->max_msg_length =
			dev->me_clients[i].props.max_msg_length;
		client->protocol_version =
			dev->me_clients[i].props.protocol_version;
		rets = dev->iamthif_cl.status;

		goto end;
	}

	if (cl->state != MEI_FILE_CONNECTING) {
		rets = -ENODEV;
		goto end;
	}


	/* prepare the output buffer */
	client = &data->out_client_properties;
	client->max_msg_length = dev->me_clients[i].props.max_msg_length;
	client->protocol_version = dev->me_clients[i].props.protocol_version;
	dev_dbg(&dev->pdev->dev, "Can connect?\n");
	if (dev->mei_host_buffer_is_empty
	    && !mei_other_client_is_connecting(dev, cl)) {
		dev_dbg(&dev->pdev->dev, "Sending Connect Message\n");
		dev->mei_host_buffer_is_empty = false;
		if (mei_connect(dev, cl)) {
			dev_dbg(&dev->pdev->dev, "Sending connect message - failed\n");
			rets = -ENODEV;
			goto end;
		} else {
			dev_dbg(&dev->pdev->dev, "Sending connect message - succeeded\n");
			cl->timer_count = MEI_CONNECT_TIMEOUT;
			cb->file_private = cl;
			list_add_tail(&cb->cb_list,
				      &dev->ctrl_rd_list.mei_cb.
				      cb_list);
		}


	} else {
		dev_dbg(&dev->pdev->dev, "Queuing the connect request due to device busy\n");
		cb->file_private = cl;
		dev_dbg(&dev->pdev->dev, "add connect cb to control write list.\n");
		list_add_tail(&cb->cb_list,
			      &dev->ctrl_wr_list.mei_cb.cb_list);
	}
	mutex_unlock(&dev->device_lock);
	err = wait_event_timeout(dev->wait_recvd_msg,
			(MEI_FILE_CONNECTED == cl->state ||
			 MEI_FILE_DISCONNECTED == cl->state),
			timeout * HZ);

	mutex_lock(&dev->device_lock);
	if (MEI_FILE_CONNECTED == cl->state) {
		dev_dbg(&dev->pdev->dev, "successfully connected to FW client.\n");
		rets = cl->status;
		goto end;
	} else {
		dev_dbg(&dev->pdev->dev, "failed to connect to FW client.cl->state = %d.\n",
		    cl->state);
		if (!err) {
			dev_dbg(&dev->pdev->dev,
				"wait_event_interruptible_timeout failed on client"
				" connect message fw response message.\n");
		}
		rets = -EFAULT;

		mei_io_list_flush(&dev->ctrl_rd_list, cl);
		mei_io_list_flush(&dev->ctrl_wr_list, cl);
		goto end;
	}
	rets = 0;
end:
	dev_dbg(&dev->pdev->dev, "free connect cb memory.");
	kfree(cb);
	return rets;
}

/**
 * find_amthi_read_list_entry - finds a amthilist entry for current file
 *
 * @dev: the device structure
 * @file: pointer to file object
 *
 * returns   returned a list entry on success, NULL on failure.
 */
struct mei_cl_cb *find_amthi_read_list_entry(
		struct mei_device *dev,
		struct file *file)
{
	struct mei_cl *cl_temp;
	struct mei_cl_cb *pos = NULL;
	struct mei_cl_cb *next = NULL;

	list_for_each_entry_safe(pos, next,
	    &dev->amthi_read_complete_list.mei_cb.cb_list, cb_list) {
		cl_temp = (struct mei_cl *)pos->file_private;
		if (cl_temp && cl_temp == &dev->iamthif_cl &&
			pos->file_object == file)
			return pos;
	}
	return NULL;
}

/**
 * amthi_read - read data from AMTHI client
 *
 * @dev: the device structure
 * @if_num:  minor number
 * @file: pointer to file object
 * @*ubuf: pointer to user data in user space
 * @length: data length to read
 * @offset: data read offset
 *
 * Locking: called under "dev->device_lock" lock
 *
 * returns
 *  returned data length on success,
 *  zero if no data to read,
 *  negative on failure.
 */
int amthi_read(struct mei_device *dev, struct file *file,
	       char __user *ubuf, size_t length, loff_t *offset)
{
	int rets;
	int wait_ret;
	struct mei_cl_cb *cb = NULL;
	struct mei_cl *cl = file->private_data;
	unsigned long timeout;
	int i;

	/* Only Posible if we are in timeout */
	if (!cl || cl != &dev->iamthif_cl) {
		dev_dbg(&dev->pdev->dev, "bad file ext.\n");
		return -ETIMEDOUT;
	}

	for (i = 0; i < dev->me_clients_num; i++) {
		if (dev->me_clients[i].client_id ==
		    dev->iamthif_cl.me_client_id)
			break;
	}

	if (i == dev->me_clients_num) {
		dev_dbg(&dev->pdev->dev, "amthi client not found.\n");
		return -ENODEV;
	}
	if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id))
		return -ENODEV;

	dev_dbg(&dev->pdev->dev, "checking amthi data\n");
	cb = find_amthi_read_list_entry(dev, file);

	/* Check for if we can block or not*/
	if (cb == NULL && file->f_flags & O_NONBLOCK)
		return -EAGAIN;


	dev_dbg(&dev->pdev->dev, "waiting for amthi data\n");
	while (cb == NULL) {
		/* unlock the Mutex */
		mutex_unlock(&dev->device_lock);

		wait_ret = wait_event_interruptible(dev->iamthif_cl.wait,
			(cb = find_amthi_read_list_entry(dev, file)));

		if (wait_ret)
			return -ERESTARTSYS;

		dev_dbg(&dev->pdev->dev, "woke up from sleep\n");

		/* Locking again the Mutex */
		mutex_lock(&dev->device_lock);
	}


	dev_dbg(&dev->pdev->dev, "Got amthi data\n");
	dev->iamthif_timer = 0;

	if (cb) {
		timeout = cb->read_time +
					msecs_to_jiffies(IAMTHIF_READ_TIMER);
		dev_dbg(&dev->pdev->dev, "amthi timeout = %lud\n",
				timeout);

		if  (time_after(jiffies, timeout)) {
			dev_dbg(&dev->pdev->dev, "amthi Time out\n");
			/* 15 sec for the message has expired */
			list_del(&cb->cb_list);
			rets = -ETIMEDOUT;
			goto free;
		}
	}
	/* if the whole message will fit remove it from the list */
	if (cb->information >= *offset && length >= (cb->information - *offset))
		list_del(&cb->cb_list);
	else if (cb->information > 0 && cb->information <= *offset) {
		/* end of the message has been reached */
		list_del(&cb->cb_list);
		rets = 0;
		goto free;
	}
		/* else means that not full buffer will be read and do not
		 * remove message from deletion list
		 */

	dev_dbg(&dev->pdev->dev, "amthi cb->response_buffer size - %d\n",
	    cb->response_buffer.size);
	dev_dbg(&dev->pdev->dev, "amthi cb->information - %lu\n",
	    cb->information);

	/* length is being turncated to PAGE_SIZE, however,
	 * the information may be longer */
	length = min_t(size_t, length, (cb->information - *offset));

	if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length))
		rets = -EFAULT;
	else {
		rets = length;
		if ((*offset + length) < cb->information) {
			*offset += length;
			goto out;
		}
	}
free:
	dev_dbg(&dev->pdev->dev, "free amthi cb memory.\n");
	*offset = 0;
	mei_free_cb_private(cb);
out:
	return rets;
}

/**
 * mei_start_read - the start read client message function.
 *
 * @dev: the device structure
 * @if_num:  minor number
 * @cl: private data of the file object
 *
 * returns 0 on success, <0 on failure.
 */
int mei_start_read(struct mei_device *dev, struct mei_cl *cl)
{
	struct mei_cl_cb *cb;
	int rets = 0;
	int i;

	if (cl->state != MEI_FILE_CONNECTED)
		return -ENODEV;

	if (dev->mei_state != MEI_ENABLED)
		return -ENODEV;

	dev_dbg(&dev->pdev->dev, "check if read is pending.\n");
	if (cl->read_pending || cl->read_cb) {
		dev_dbg(&dev->pdev->dev, "read is pending.\n");
		return -EBUSY;
	}

	cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
	if (!cb)
		return -ENOMEM;

	dev_dbg(&dev->pdev->dev, "allocation call back successful. host client = %d, ME client = %d\n",
		cl->host_client_id, cl->me_client_id);

	for (i = 0; i < dev->me_clients_num; i++) {
		if (dev->me_clients[i].client_id == cl->me_client_id)
			break;

	}

	if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id)) {
		rets = -ENODEV;
		goto unlock;
	}

	if (i == dev->me_clients_num) {
		rets = -ENODEV;
		goto unlock;
	}

	cb->response_buffer.size = dev->me_clients[i].props.max_msg_length;
	cb->response_buffer.data =
			kmalloc(cb->response_buffer.size, GFP_KERNEL);
	if (!cb->response_buffer.data) {
		rets = -ENOMEM;
		goto unlock;
	}
	dev_dbg(&dev->pdev->dev, "allocation call back data success.\n");
	cb->major_file_operations = MEI_READ;
	/* make sure information is zero before we start */
	cb->information = 0;
	cb->file_private = (void *) cl;
	cl->read_cb = cb;
	if (dev->mei_host_buffer_is_empty) {
		dev->mei_host_buffer_is_empty = false;
		if (mei_send_flow_control(dev, cl)) {
			rets = -ENODEV;
			goto unlock;
		}
		list_add_tail(&cb->cb_list, &dev->read_list.mei_cb.cb_list);
	} else {
		list_add_tail(&cb->cb_list, &dev->ctrl_wr_list.mei_cb.cb_list);
	}
	return rets;
unlock:
	mei_free_cb_private(cb);
	return rets;
}

/**
 * amthi_write - write iamthif data to amthi client
 *
 * @dev: the device structure
 * @cb: mei call back struct
 *
 * returns 0 on success, <0 on failure.
 */
int amthi_write(struct mei_device *dev, struct mei_cl_cb *cb)
{
	struct mei_msg_hdr mei_hdr;
	int ret;

	if (!dev || !cb)
		return -ENODEV;

	dev_dbg(&dev->pdev->dev, "write data to amthi client.\n");

	dev->iamthif_state = MEI_IAMTHIF_WRITING;
	dev->iamthif_current_cb = cb;
	dev->iamthif_file_object = cb->file_object;
	dev->iamthif_canceled = false;
	dev->iamthif_ioctl = true;
	dev->iamthif_msg_buf_size = cb->request_buffer.size;
	memcpy(dev->iamthif_msg_buf, cb->request_buffer.data,
	       cb->request_buffer.size);

	ret = mei_flow_ctrl_creds(dev, &dev->iamthif_cl);
	if (ret < 0)
		return ret;

	if (ret && dev->mei_host_buffer_is_empty) {
		ret = 0;
		dev->mei_host_buffer_is_empty = false;
		if (cb->request_buffer.size >
			(((dev->host_hw_state & H_CBD) >> 24) * sizeof(u32))
				-sizeof(struct mei_msg_hdr)) {
			mei_hdr.length =
			    (((dev->host_hw_state & H_CBD) >> 24) *
			    sizeof(u32)) - sizeof(struct mei_msg_hdr);
			mei_hdr.msg_complete = 0;
		} else {
			mei_hdr.length = cb->request_buffer.size;
			mei_hdr.msg_complete = 1;
		}

		mei_hdr.host_addr = dev->iamthif_cl.host_client_id;
		mei_hdr.me_addr = dev->iamthif_cl.me_client_id;
		mei_hdr.reserved = 0;
		dev->iamthif_msg_buf_index += mei_hdr.length;
		if (mei_write_message(dev, &mei_hdr,
					(unsigned char *)(dev->iamthif_msg_buf),
					mei_hdr.length))
			return -ENODEV;

		if (mei_hdr.msg_complete) {
			if (mei_flow_ctrl_reduce(dev, &dev->iamthif_cl))
				return -ENODEV;
			dev->iamthif_flow_control_pending = true;
			dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
			dev_dbg(&dev->pdev->dev, "add amthi cb to write waiting list\n");
			dev->iamthif_current_cb = cb;
			dev->iamthif_file_object = cb->file_object;
			list_add_tail(&cb->cb_list,
				      &dev->write_waiting_list.mei_cb.cb_list);
		} else {
			dev_dbg(&dev->pdev->dev, "message does not complete, "
					"so add amthi cb to write list.\n");
			list_add_tail(&cb->cb_list,
				      &dev->write_list.mei_cb.cb_list);
		}
	} else {
		if (!(dev->mei_host_buffer_is_empty))
			dev_dbg(&dev->pdev->dev, "host buffer is not empty");

		dev_dbg(&dev->pdev->dev, "No flow control credentials, "
				"so add iamthif cb to write list.\n");
		list_add_tail(&cb->cb_list, &dev->write_list.mei_cb.cb_list);
	}
	return 0;
}

/**
 * iamthif_ioctl_send_msg - send cmd data to amthi client
 *
 * @dev: the device structure
 *
 * returns 0 on success, <0 on failure.
 */
void mei_run_next_iamthif_cmd(struct mei_device *dev)
{
	struct mei_cl *cl_tmp;
	struct mei_cl_cb *pos = NULL;
	struct mei_cl_cb *next = NULL;
	int status;

	if (!dev)
		return;

	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;
	dev->iamthif_file_object = NULL;

	dev_dbg(&dev->pdev->dev, "complete amthi cmd_list cb.\n");

	list_for_each_entry_safe(pos, next,
			&dev->amthi_cmd_list.mei_cb.cb_list, cb_list) {
		list_del(&pos->cb_list);
		cl_tmp = (struct mei_cl *)pos->file_private;

		if (cl_tmp && cl_tmp == &dev->iamthif_cl) {
			status = amthi_write(dev, pos);
			if (status) {
				dev_dbg(&dev->pdev->dev,
					"amthi write failed status = %d\n",
						status);
				return;
			}
			break;
		}
	}
}

/**
 * mei_free_cb_private - free mei_cb_private related memory
 *
 * @cb: mei callback struct
 */
void mei_free_cb_private(struct mei_cl_cb *cb)
{
	if (cb == NULL)
		return;

	kfree(cb->request_buffer.data);
	kfree(cb->response_buffer.data);
	kfree(cb);
}