main.c 23.9 KB
Newer Older
1 2 3
/*
 *
 * Intel Management Engine Interface (Intel MEI) Linux driver
4
 * Copyright (c) 2003-2012, Intel Corporation.
5 6 7 8 9 10 11 12 13 14 15 16
 *
 * 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.
 *
 */

17 18
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/device.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/poll.h>
#include <linux/init.h>
#include <linux/ioctl.h>
#include <linux/cdev.h>
#include <linux/sched.h>
#include <linux/uuid.h>
#include <linux/compat.h>
#include <linux/jiffies.h>
#include <linux/interrupt.h>
38
#include <linux/miscdevice.h>
39

40
#include <linux/mei.h>
41 42

#include "mei_dev.h"
43 44
#include "interface.h"

45 46
/* AMT device is a singleton on the platform */
static struct pci_dev *mei_pdev;
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

/* mei_pci_tbl - PCI Device ID Table */
static DEFINE_PCI_DEVICE_TABLE(mei_pci_tbl) = {
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82946GZ)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G35)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82Q965)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G965)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GM965)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GME965)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q35)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82G33)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q33)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82X38)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_3200)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_6)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_7)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_8)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_9)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_10)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_1)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_2)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_3)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_4)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_1)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_2)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_3)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_4)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_1)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_2)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_CPT_1)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PBG_1)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_1)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_2)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_3)},
81 82
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_LP)},
83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104

	/* required last entry */
	{0, }
};

MODULE_DEVICE_TABLE(pci, mei_pci_tbl);

static DEFINE_MUTEX(mei_mutex);


/**
 * find_read_list_entry - find read list entry
 *
 * @dev: device structure
 * @file: pointer to file structure
 *
 * returns cb on success, NULL on error
 */
static struct mei_cl_cb *find_read_list_entry(
		struct mei_device *dev,
		struct mei_cl *cl)
{
105 106
	struct mei_cl_cb *pos = NULL;
	struct mei_cl_cb *next = NULL;
107

108
	dev_dbg(&dev->pdev->dev, "remove read_list CB\n");
109 110
	list_for_each_entry_safe(pos, next, &dev->read_list.list, list)
		if (mei_cl_cmp_id(cl, pos->cl))
111
			return pos;
112 113 114 115 116 117 118 119 120 121 122 123 124 125 126
	return NULL;
}

/**
 * mei_open - the open function
 *
 * @inode: pointer to inode structure
 * @file: pointer to file structure
 *
 * returns 0 on success, <0 on error
 */
static int mei_open(struct inode *inode, struct file *file)
{
	struct mei_cl *cl;
	struct mei_device *dev;
127 128
	unsigned long cl_id;
	int err;
129 130

	err = -ENODEV;
131
	if (!mei_pdev)
132 133
		goto out;

134
	dev = pci_get_drvdata(mei_pdev);
135
	if (!dev)
136 137 138 139
		goto out;

	mutex_lock(&dev->device_lock);
	err = -ENOMEM;
140
	cl = mei_cl_allocate(dev);
141
	if (!cl)
142
		goto out_unlock;
143 144

	err = -ENODEV;
145 146 147
	if (dev->dev_state != MEI_DEV_ENABLED) {
		dev_dbg(&dev->pdev->dev, "dev_state != MEI_ENABLED  dev_state = %s\n",
		    mei_dev_state_str(dev->dev_state));
148 149 150
		goto out_unlock;
	}
	err = -EMFILE;
151 152 153
	if (dev->open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) {
		dev_err(&dev->pdev->dev, "open_handle_count exceded %d",
			MEI_MAX_OPEN_HANDLE_COUNT);
154
		goto out_unlock;
155
	}
156

157
	cl_id = find_first_zero_bit(dev->host_clients_map, MEI_CLIENTS_MAX);
158 159 160
	if (cl_id >= MEI_CLIENTS_MAX) {
		dev_err(&dev->pdev->dev, "client_id exceded %d",
				MEI_CLIENTS_MAX) ;
161
		goto out_unlock;
162
	}
163

164 165
	cl->host_client_id  = cl_id;

166 167 168
	dev_dbg(&dev->pdev->dev, "client_id = %d\n", cl->host_client_id);

	dev->open_handle_count++;
169

170 171 172 173 174 175 176 177 178
	list_add_tail(&cl->link, &dev->file_list);

	set_bit(cl->host_client_id, dev->host_clients_map);
	cl->state = MEI_FILE_INITIALIZING;
	cl->sm_state = 0;

	file->private_data = cl;
	mutex_unlock(&dev->device_lock);

179
	return nonseekable_open(inode, file);
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

out_unlock:
	mutex_unlock(&dev->device_lock);
	kfree(cl);
out:
	return err;
}

/**
 * mei_release - the release function
 *
 * @inode: pointer to inode structure
 * @file: pointer to file structure
 *
 * returns 0 on success, <0 on error
 */
static int mei_release(struct inode *inode, struct file *file)
{
	struct mei_cl *cl = file->private_data;
	struct mei_cl_cb *cb;
	struct mei_device *dev;
	int rets = 0;

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

	dev = cl->dev;

	mutex_lock(&dev->device_lock);
209 210 211 212 213 214 215 216 217
	if (cl == &dev->iamthif_cl) {
		rets = mei_amthif_release(dev, file);
		goto out;
	}
	if (cl->state == MEI_FILE_CONNECTED) {
		cl->state = MEI_FILE_DISCONNECTING;
		dev_dbg(&dev->pdev->dev,
			"disconnecting client host client = %d, "
		    "ME client = %d\n",
218 219
		    cl->host_client_id,
		    cl->me_client_id);
220 221 222 223 224 225 226 227 228 229 230
		rets = mei_disconnect_host_client(dev, cl);
	}
	mei_cl_flush_queues(cl);
	dev_dbg(&dev->pdev->dev, "remove client host client = %d, ME client = %d\n",
	    cl->host_client_id,
	    cl->me_client_id);

	if (dev->open_handle_count > 0) {
		clear_bit(cl->host_client_id, dev->host_clients_map);
		dev->open_handle_count--;
	}
231
	mei_me_cl_unlink(dev, cl);
232 233 234 235 236 237 238 239 240 241 242 243

	/* free read cb */
	cb = NULL;
	if (cl->read_cb) {
		cb = find_read_list_entry(dev, cl);
		/* Remove entry from read list */
		if (cb)
			list_del(&cb->list);

		cb = cl->read_cb;
		cl->read_cb = NULL;
	}
244

245
	file->private_data = NULL;
246

247 248
	if (cb) {
		mei_io_cb_free(cb);
249 250
		cb = NULL;
	}
251 252 253

	kfree(cl);
out:
254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269
	mutex_unlock(&dev->device_lock);
	return rets;
}


/**
 * mei_read - the read function.
 *
 * @file: pointer to file structure
 * @ubuf: pointer to user buffer
 * @length: buffer length
 * @offset: data offset in buffer
 *
 * returns >=0 data length on success , <0 on error
 */
static ssize_t mei_read(struct file *file, char __user *ubuf,
270
			size_t length, loff_t *offset)
271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286
{
	struct mei_cl *cl = file->private_data;
	struct mei_cl_cb *cb_pos = NULL;
	struct mei_cl_cb *cb = NULL;
	struct mei_device *dev;
	int i;
	int rets;
	int err;


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

	dev = cl->dev;

	mutex_lock(&dev->device_lock);
287
	if (dev->dev_state != MEI_DEV_ENABLED) {
288 289 290 291 292 293
		rets = -ENODEV;
		goto out;
	}

	if ((cl->sm_state & MEI_WD_STATE_INDEPENDENCE_MSG_SENT) == 0) {
		/* Do not allow to read watchdog client */
294
		i = mei_me_cl_by_uuid(dev, &mei_wd_guid);
295 296 297 298 299 300 301 302 303 304 305 306
		if (i >= 0) {
			struct mei_me_client *me_client = &dev->me_clients[i];
			if (cl->me_client_id == me_client->client_id) {
				rets = -EBADF;
				goto out;
			}
		}
	} else {
		cl->sm_state &= ~MEI_WD_STATE_INDEPENDENCE_MSG_SENT;
	}

	if (cl == &dev->iamthif_cl) {
307
		rets = mei_amthif_read(dev, file, ubuf, length, offset);
308 309 310
		goto out;
	}

311
	if (cl->read_cb && cl->read_cb->buf_idx > *offset) {
312 313
		cb = cl->read_cb;
		goto copy_buffer;
314 315
	} else if (cl->read_cb && cl->read_cb->buf_idx > 0 &&
		   cl->read_cb->buf_idx <= *offset) {
316 317 318
		cb = cl->read_cb;
		rets = 0;
		goto free;
319
	} else if ((!cl->read_cb || !cl->read_cb->buf_idx) && *offset > 0) {
320
		/*Offset needs to be cleaned for contiguous reads*/
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
		*offset = 0;
		rets = 0;
		goto out;
	}

	err = mei_start_read(dev, cl);
	if (err && err != -EBUSY) {
		dev_dbg(&dev->pdev->dev,
			"mei start read failure with status = %d\n", err);
		rets = err;
		goto out;
	}

	if (MEI_READ_COMPLETE != cl->reading_state &&
			!waitqueue_active(&cl->rx_wait)) {
		if (file->f_flags & O_NONBLOCK) {
			rets = -EAGAIN;
			goto out;
		}

		mutex_unlock(&dev->device_lock);

		if (wait_event_interruptible(cl->rx_wait,
			(MEI_READ_COMPLETE == cl->reading_state ||
			 MEI_FILE_INITIALIZING == cl->state ||
			 MEI_FILE_DISCONNECTED == cl->state ||
			 MEI_FILE_DISCONNECTING == cl->state))) {
			if (signal_pending(current))
				return -EINTR;
			return -ERESTARTSYS;
		}

		mutex_lock(&dev->device_lock);
		if (MEI_FILE_INITIALIZING == cl->state ||
		    MEI_FILE_DISCONNECTED == cl->state ||
		    MEI_FILE_DISCONNECTING == cl->state) {
			rets = -EBUSY;
			goto out;
		}
	}

	cb = cl->read_cb;

	if (!cb) {
		rets = -ENODEV;
		goto out;
	}
	if (cl->reading_state != MEI_READ_COMPLETE) {
		rets = 0;
		goto out;
	}
	/* now copy the data to user space */
copy_buffer:
	dev_dbg(&dev->pdev->dev, "cb->response_buffer size - %d\n",
	    cb->response_buffer.size);
376 377
	dev_dbg(&dev->pdev->dev, "cb->buf_idx - %lu\n", cb->buf_idx);
	if (length == 0 || ubuf == NULL || *offset > cb->buf_idx) {
378 379 380 381
		rets = -EMSGSIZE;
		goto free;
	}

382 383 384
	/* length is being truncated to PAGE_SIZE,
	 * however buf_idx may point beyond that */
	length = min_t(size_t, length, cb->buf_idx - *offset);
385

386
	if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length)) {
387 388 389 390 391 392
		rets = -EFAULT;
		goto free;
	}

	rets = length;
	*offset += length;
393
	if ((unsigned long)*offset < cb->buf_idx)
394 395 396 397 398 399
		goto out;

free:
	cb_pos = find_read_list_entry(dev, cl);
	/* Remove entry from read list */
	if (cb_pos)
400
		list_del(&cb_pos->list);
401
	mei_io_cb_free(cb);
402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420
	cl->reading_state = MEI_IDLE;
	cl->read_cb = NULL;
	cl->read_pending = 0;
out:
	dev_dbg(&dev->pdev->dev, "end mei read rets= %d\n", rets);
	mutex_unlock(&dev->device_lock);
	return rets;
}
/**
 * mei_write - the write function.
 *
 * @file: pointer to file structure
 * @ubuf: pointer to user buffer
 * @length: buffer length
 * @offset: data offset in buffer
 *
 * returns >=0 data length on success , <0 on error
 */
static ssize_t mei_write(struct file *file, const char __user *ubuf,
421
			 size_t length, loff_t *offset)
422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437
{
	struct mei_cl *cl = file->private_data;
	struct mei_cl_cb *write_cb = NULL;
	struct mei_msg_hdr mei_hdr;
	struct mei_device *dev;
	unsigned long timeout = 0;
	int rets;
	int i;

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

	dev = cl->dev;

	mutex_lock(&dev->device_lock);

438
	if (dev->dev_state != MEI_DEV_ENABLED) {
439
		rets = -ENODEV;
440
		goto err;
441 442
	}

443 444 445
	i = mei_me_cl_by_id(dev, cl->me_client_id);
	if (i < 0) {
		rets = -ENODEV;
446
		goto err;
447 448 449
	}
	if (length > dev->me_clients[i].props.max_msg_length || length <= 0) {
		rets = -EMSGSIZE;
450
		goto err;
451 452 453 454 455 456
	}

	if (cl->state != MEI_FILE_CONNECTED) {
		rets = -ENODEV;
		dev_err(&dev->pdev->dev, "host client = %d,  is not connected to ME client = %d",
			cl->host_client_id, cl->me_client_id);
457
		goto err;
458
	}
459
	if (cl == &dev->iamthif_cl) {
460
		write_cb = mei_amthif_find_read_list_entry(dev, file);
461 462 463

		if (write_cb) {
			timeout = write_cb->read_time +
464
				mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
465 466

			if (time_after(jiffies, timeout) ||
467 468
			    cl->reading_state == MEI_READ_COMPLETE) {
				*offset = 0;
469
				list_del(&write_cb->list);
470
				mei_io_cb_free(write_cb);
471
				write_cb = NULL;
472 473 474 475 476 477 478 479 480
			}
		}
	}

	/* free entry used in read */
	if (cl->reading_state == MEI_READ_COMPLETE) {
		*offset = 0;
		write_cb = find_read_list_entry(dev, cl);
		if (write_cb) {
481
			list_del(&write_cb->list);
482
			mei_io_cb_free(write_cb);
483 484 485 486 487
			write_cb = NULL;
			cl->reading_state = MEI_IDLE;
			cl->read_cb = NULL;
			cl->read_pending = 0;
		}
488
	} else if (cl->reading_state == MEI_IDLE && !cl->read_pending)
489 490 491
		*offset = 0;


492
	write_cb = mei_io_cb_init(cl, file);
493
	if (!write_cb) {
494 495
		dev_err(&dev->pdev->dev, "write cb allocation failed\n");
		rets = -ENOMEM;
496
		goto err;
497
	}
498 499
	rets = mei_io_cb_alloc_req_buf(write_cb, length);
	if (rets)
500
		goto err;
501

502
	dev_dbg(&dev->pdev->dev, "cb request size = %zd\n", length);
503

504 505
	rets = copy_from_user(write_cb->request_buffer.data, ubuf, length);
	if (rets)
506
		goto err;
507 508 509 510 511 512 513 514 515 516 517 518

	cl->sm_state = 0;
	if (length == 4 &&
	    ((memcmp(mei_wd_state_independence_msg[0],
				 write_cb->request_buffer.data, 4) == 0) ||
	     (memcmp(mei_wd_state_independence_msg[1],
				 write_cb->request_buffer.data, 4) == 0) ||
	     (memcmp(mei_wd_state_independence_msg[2],
				 write_cb->request_buffer.data, 4) == 0)))
		cl->sm_state |= MEI_WD_STATE_INDEPENDENCE_MSG_SENT;

	if (cl == &dev->iamthif_cl) {
519
		rets = mei_amthif_write(dev, write_cb);
520

521 522 523 524
		if (rets) {
			dev_err(&dev->pdev->dev,
				"amthi write failed with status = %d\n", rets);
			goto err;
525 526
		}
		mutex_unlock(&dev->device_lock);
527
		return length;
528 529
	}

530
	write_cb->fop_type = MEI_FOP_WRITE;
531 532 533 534 535

	dev_dbg(&dev->pdev->dev, "host client = %d, ME client = %d\n",
	    cl->host_client_id, cl->me_client_id);
	rets = mei_flow_ctrl_creds(dev, cl);
	if (rets < 0)
536
		goto err;
537

538 539 540
	if (rets == 0 || dev->mei_host_buffer_is_empty == false) {
		write_cb->buf_idx = 0;
		mei_hdr.msg_complete = 0;
541
		cl->writing_state = MEI_WRITING;
542 543
		goto out;
	}
544

545 546 547 548
	dev->mei_host_buffer_is_empty = false;
	if (length >  mei_hbuf_max_data(dev)) {
		mei_hdr.length = mei_hbuf_max_data(dev);
		mei_hdr.msg_complete = 0;
549
	} else {
550 551 552 553 554 555
		mei_hdr.length = length;
		mei_hdr.msg_complete = 1;
	}
	mei_hdr.host_addr = cl->host_client_id;
	mei_hdr.me_addr = cl->me_client_id;
	mei_hdr.reserved = 0;
556 557 558

	dev_dbg(&dev->pdev->dev, "write " MEI_HDR_FMT "\n",
		MEI_HDR_PRM(&mei_hdr));
559
	if (mei_write_message(dev, &mei_hdr, write_cb->request_buffer.data)) {
560 561 562 563 564
		rets = -ENODEV;
		goto err;
	}
	cl->writing_state = MEI_WRITING;
	write_cb->buf_idx = mei_hdr.length;
565

566 567 568 569 570 571 572 573
out:
	if (mei_hdr.msg_complete) {
		if (mei_flow_ctrl_reduce(dev, cl)) {
			rets = -ENODEV;
			goto err;
		}
		list_add_tail(&write_cb->list, &dev->write_waiting_list.list);
	} else {
574
		list_add_tail(&write_cb->list, &dev->write_list.list);
575
	}
576

577 578 579
	mutex_unlock(&dev->device_lock);
	return length;

580
err:
581
	mutex_unlock(&dev->device_lock);
582
	mei_io_cb_free(write_cb);
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
	return rets;
}


/**
 * mei_ioctl - the IOCTL function
 *
 * @file: pointer to file structure
 * @cmd: ioctl command
 * @data: pointer to mei message structure
 *
 * returns 0 on success , <0 on error
 */
static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data)
{
	struct mei_device *dev;
	struct mei_cl *cl = file->private_data;
	struct mei_connect_client_data *connect_data = NULL;
	int rets;

	if (cmd != IOCTL_MEI_CONNECT_CLIENT)
		return -EINVAL;

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

	dev = cl->dev;

	dev_dbg(&dev->pdev->dev, "IOCTL cmd = 0x%x", cmd);

	mutex_lock(&dev->device_lock);
614
	if (dev->dev_state != MEI_DEV_ENABLED) {
615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664
		rets = -ENODEV;
		goto out;
	}

	dev_dbg(&dev->pdev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n");

	connect_data = kzalloc(sizeof(struct mei_connect_client_data),
							GFP_KERNEL);
	if (!connect_data) {
		rets = -ENOMEM;
		goto out;
	}
	dev_dbg(&dev->pdev->dev, "copy connect data from user\n");
	if (copy_from_user(connect_data, (char __user *)data,
				sizeof(struct mei_connect_client_data))) {
		dev_dbg(&dev->pdev->dev, "failed to copy data from userland\n");
		rets = -EFAULT;
		goto out;
	}
	rets = mei_ioctl_connect_client(file, connect_data);

	/* if all is ok, copying the data back to user. */
	if (rets)
		goto out;

	dev_dbg(&dev->pdev->dev, "copy connect data to user\n");
	if (copy_to_user((char __user *)data, connect_data,
				sizeof(struct mei_connect_client_data))) {
		dev_dbg(&dev->pdev->dev, "failed to copy data to userland\n");
		rets = -EFAULT;
		goto out;
	}

out:
	kfree(connect_data);
	mutex_unlock(&dev->device_lock);
	return rets;
}

/**
 * mei_compat_ioctl - the compat IOCTL function
 *
 * @file: pointer to file structure
 * @cmd: ioctl command
 * @data: pointer to mei message structure
 *
 * returns 0 on success , <0 on error
 */
#ifdef CONFIG_COMPAT
static long mei_compat_ioctl(struct file *file,
665
			unsigned int cmd, unsigned long data)
666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692
{
	return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data));
}
#endif


/**
 * mei_poll - the poll function
 *
 * @file: pointer to file structure
 * @wait: pointer to poll_table structure
 *
 * returns poll mask
 */
static unsigned int mei_poll(struct file *file, poll_table *wait)
{
	struct mei_cl *cl = file->private_data;
	struct mei_device *dev;
	unsigned int mask = 0;

	if (WARN_ON(!cl || !cl->dev))
		return mask;

	dev = cl->dev;

	mutex_lock(&dev->device_lock);

693
	if (dev->dev_state != MEI_DEV_ENABLED)
694 695 696 697
		goto out;


	if (cl == &dev->iamthif_cl) {
698
		mask = mei_amthif_poll(dev, file, wait);
699 700 701 702 703 704 705 706 707 708 709 710 711 712
		goto out;
	}

	mutex_unlock(&dev->device_lock);
	poll_wait(file, &cl->tx_wait, wait);
	mutex_lock(&dev->device_lock);
	if (MEI_WRITE_COMPLETE == cl->writing_state)
		mask |= (POLLIN | POLLRDNORM);

out:
	mutex_unlock(&dev->device_lock);
	return mask;
}

713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734
/*
 * file operations structure will be used for mei char device.
 */
static const struct file_operations mei_fops = {
	.owner = THIS_MODULE,
	.read = mei_read,
	.unlocked_ioctl = mei_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = mei_compat_ioctl,
#endif
	.open = mei_open,
	.release = mei_release,
	.write = mei_write,
	.poll = mei_poll,
	.llseek = no_llseek
};


/*
 * Misc Device Struct
 */
static struct miscdevice  mei_misc_device = {
735
		.name = "mei",
736 737 738 739
		.fops = &mei_fops,
		.minor = MISC_DYNAMIC_MINOR,
};

740 741 742 743 744 745 746
/**
 * mei_quirk_probe - probe for devices that doesn't valid ME interface
 * @pdev: PCI device structure
 * @ent: entry into pci_device_table
 *
 * returns true if ME Interface is valid, false otherwise
 */
B
Bill Pemberton 已提交
747
static bool mei_quirk_probe(struct pci_dev *pdev,
748 749 750 751 752 753 754 755 756 757 758 759 760
				const struct pci_device_id *ent)
{
	u32 reg;
	if (ent->device == MEI_DEV_ID_PBG_1) {
		pci_read_config_dword(pdev, 0x48, &reg);
		/* make sure that bit 9 is up and bit 10 is down */
		if ((reg & 0x600) == 0x200) {
			dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
			return false;
		}
	}
	return true;
}
761 762 763 764 765 766 767 768
/**
 * mei_probe - Device Initialization Routine
 *
 * @pdev: PCI device structure
 * @ent: entry in kcs_pci_tbl
 *
 * returns 0 on success, <0 on failure.
 */
B
Bill Pemberton 已提交
769
static int mei_probe(struct pci_dev *pdev,
770 771 772 773 774 775
				const struct pci_device_id *ent)
{
	struct mei_device *dev;
	int err;

	mutex_lock(&mei_mutex);
776 777 778 779 780 781

	if (!mei_quirk_probe(pdev, ent)) {
		err = -ENODEV;
		goto end;
	}

782
	if (mei_pdev) {
783 784 785 786 787 788
		err = -EEXIST;
		goto end;
	}
	/* enable pci dev */
	err = pci_enable_device(pdev);
	if (err) {
789
		dev_err(&pdev->dev, "failed to enable pci device.\n");
790 791 792 793 794
		goto end;
	}
	/* set PCI host mastering  */
	pci_set_master(pdev);
	/* pci request regions for mei driver */
795
	err = pci_request_regions(pdev, KBUILD_MODNAME);
796
	if (err) {
797
		dev_err(&pdev->dev, "failed to get pci regions.\n");
798 799 800 801 802 803 804 805 806 807 808
		goto disable_device;
	}
	/* allocates and initializes the mei dev structure */
	dev = mei_device_init(pdev);
	if (!dev) {
		err = -ENOMEM;
		goto release_regions;
	}
	/* mapping  IO device memory */
	dev->mem_addr = pci_iomap(pdev, 0, 0);
	if (!dev->mem_addr) {
809
		dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
810 811 812 813 814 815 816 817 818 819
		err = -ENOMEM;
		goto free_device;
	}
	pci_enable_msi(pdev);

	 /* request and enable interrupt */
	if (pci_dev_msi_enabled(pdev))
		err = request_threaded_irq(pdev->irq,
			NULL,
			mei_interrupt_thread_handler,
820
			IRQF_ONESHOT, KBUILD_MODNAME, dev);
821 822 823 824
	else
		err = request_threaded_irq(pdev->irq,
			mei_interrupt_quick_handler,
			mei_interrupt_thread_handler,
825
			IRQF_SHARED, KBUILD_MODNAME, dev);
826 827

	if (err) {
828
		dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
829
		       pdev->irq);
830
		goto disable_msi;
831 832
	}
	INIT_DELAYED_WORK(&dev->timer_work, mei_timer);
833 834
	INIT_WORK(&dev->init_work, mei_host_client_init);

835
	if (mei_hw_init(dev)) {
836
		dev_err(&pdev->dev, "init hw failure.\n");
837 838 839 840 841 842 843 844
		err = -ENODEV;
		goto release_irq;
	}

	err = misc_register(&mei_misc_device);
	if (err)
		goto release_irq;

845
	mei_pdev = pdev;
846 847 848 849 850 851 852
	pci_set_drvdata(pdev, dev);


	schedule_delayed_work(&dev->timer_work, HZ);

	mutex_unlock(&mei_mutex);

853
	pr_debug("initialization successful.\n");
854 855 856 857 858 859 860 861 862

	return 0;

release_irq:
	/* disable interrupts */
	dev->host_hw_state = mei_hcsr_read(dev);
	mei_disable_interrupts(dev);
	flush_scheduled_work();
	free_irq(pdev->irq, dev);
863
disable_msi:
864 865 866 867 868 869 870 871 872 873
	pci_disable_msi(pdev);
	pci_iounmap(pdev, dev->mem_addr);
free_device:
	kfree(dev);
release_regions:
	pci_release_regions(pdev);
disable_device:
	pci_disable_device(pdev);
end:
	mutex_unlock(&mei_mutex);
874
	dev_err(&pdev->dev, "initialization failed.\n");
875 876 877 878 879 880 881 882 883 884 885
	return err;
}

/**
 * mei_remove - Device Removal Routine
 *
 * @pdev: PCI device structure
 *
 * mei_remove is called by the PCI subsystem to alert the driver
 * that it should release a PCI device.
 */
B
Bill Pemberton 已提交
886
static void mei_remove(struct pci_dev *pdev)
887 888 889
{
	struct mei_device *dev;

890
	if (mei_pdev != pdev)
891 892 893 894 895 896 897 898
		return;

	dev = pci_get_drvdata(pdev);
	if (!dev)
		return;

	mutex_lock(&dev->device_lock);

899 900 901
	cancel_delayed_work(&dev->timer_work);

	mei_wd_stop(dev);
902

903
	mei_pdev = NULL;
904 905 906 907 908 909 910 911 912 913 914

	if (dev->iamthif_cl.state == MEI_FILE_CONNECTED) {
		dev->iamthif_cl.state = MEI_FILE_DISCONNECTING;
		mei_disconnect_host_client(dev, &dev->iamthif_cl);
	}
	if (dev->wd_cl.state == MEI_FILE_CONNECTED) {
		dev->wd_cl.state = MEI_FILE_DISCONNECTING;
		mei_disconnect_host_client(dev, &dev->wd_cl);
	}

	/* Unregistering watchdog device */
915
	mei_watchdog_unregister(dev);
916 917 918

	/* remove entry if already in list */
	dev_dbg(&pdev->dev, "list del iamthif and wd file list.\n");
919 920
	mei_me_cl_unlink(dev, &dev->wd_cl);
	mei_me_cl_unlink(dev, &dev->iamthif_cl);
921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942

	dev->iamthif_current_cb = NULL;
	dev->me_clients_num = 0;

	mutex_unlock(&dev->device_lock);

	flush_scheduled_work();

	/* disable interrupts */
	mei_disable_interrupts(dev);

	free_irq(pdev->irq, dev);
	pci_disable_msi(pdev);
	pci_set_drvdata(pdev, NULL);

	if (dev->mem_addr)
		pci_iounmap(pdev, dev->mem_addr);

	kfree(dev);

	pci_release_regions(pdev);
	pci_disable_device(pdev);
943 944

	misc_deregister(&mei_misc_device);
945
}
946 947 948 949 950 951 952 953 954 955
#ifdef CONFIG_PM
static int mei_pci_suspend(struct device *device)
{
	struct pci_dev *pdev = to_pci_dev(device);
	struct mei_device *dev = pci_get_drvdata(pdev);
	int err;

	if (!dev)
		return -ENODEV;
	mutex_lock(&dev->device_lock);
956 957 958

	cancel_delayed_work(&dev->timer_work);

959
	/* Stop watchdog if exists */
960
	err = mei_wd_stop(dev);
961
	/* Set new mei state */
962 963 964
	if (dev->dev_state == MEI_DEV_ENABLED ||
	    dev->dev_state == MEI_DEV_RECOVERING_FROM_RESET) {
		dev->dev_state = MEI_DEV_POWER_DOWN;
965 966 967 968 969
		mei_reset(dev, 0);
	}
	mutex_unlock(&dev->device_lock);

	free_irq(pdev->irq, dev);
970
	pci_disable_msi(pdev);
971 972 973 974 975 976 977 978 979 980 981 982 983 984

	return err;
}

static int mei_pci_resume(struct device *device)
{
	struct pci_dev *pdev = to_pci_dev(device);
	struct mei_device *dev;
	int err;

	dev = pci_get_drvdata(pdev);
	if (!dev)
		return -ENODEV;

985 986 987 988 989 990 991
	pci_enable_msi(pdev);

	/* request and enable interrupt */
	if (pci_dev_msi_enabled(pdev))
		err = request_threaded_irq(pdev->irq,
			NULL,
			mei_interrupt_thread_handler,
992
			IRQF_ONESHOT, KBUILD_MODNAME, dev);
993 994
	else
		err = request_threaded_irq(pdev->irq,
995 996
			mei_interrupt_quick_handler,
			mei_interrupt_thread_handler,
997
			IRQF_SHARED, KBUILD_MODNAME, dev);
998

999
	if (err) {
1000 1001
		dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
				pdev->irq);
1002 1003 1004 1005
		return err;
	}

	mutex_lock(&dev->device_lock);
1006
	dev->dev_state = MEI_DEV_POWER_UP;
1007 1008 1009
	mei_reset(dev, 1);
	mutex_unlock(&dev->device_lock);

1010 1011 1012
	/* Start timer if stopped in suspend */
	schedule_delayed_work(&dev->timer_work, HZ);

1013 1014 1015 1016 1017
	return err;
}
static SIMPLE_DEV_PM_OPS(mei_pm_ops, mei_pci_suspend, mei_pci_resume);
#define MEI_PM_OPS	(&mei_pm_ops)
#else
1018
#define MEI_PM_OPS	NULL
1019 1020 1021 1022 1023
#endif /* CONFIG_PM */
/*
 *  PCI driver structure
 */
static struct pci_driver mei_driver = {
1024
	.name = KBUILD_MODNAME,
1025 1026
	.id_table = mei_pci_tbl,
	.probe = mei_probe,
B
Bill Pemberton 已提交
1027 1028
	.remove = mei_remove,
	.shutdown = mei_remove,
1029 1030 1031
	.driver.pm = MEI_PM_OPS,
};

T
Tomas Winkler 已提交
1032
module_pci_driver(mei_driver);
1033 1034 1035 1036

MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
MODULE_LICENSE("GPL v2");