interrupt.c 35.1 KB
Newer Older
O
Oren Weil 已提交
1 2 3
/*
 *
 * Intel Management Engine Interface (Intel MEI) Linux driver
4
 * Copyright (c) 2003-2012, Intel Corporation.
O
Oren Weil 已提交
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
 *
 * 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/pci.h>
#include <linux/kthread.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/jiffies.h>

#include "mei_dev.h"
25
#include <linux/mei.h>
O
Oren Weil 已提交
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
#include "hw.h"
#include "interface.h"


/**
 * mei_interrupt_quick_handler - The ISR of the MEI device
 *
 * @irq: The irq number
 * @dev_id: pointer to the device structure
 *
 * returns irqreturn_t
 */
irqreturn_t mei_interrupt_quick_handler(int irq, void *dev_id)
{
	struct mei_device *dev = (struct mei_device *) dev_id;
	u32 csr_reg = mei_hcsr_read(dev);

	if ((csr_reg & H_IS) != H_IS)
		return IRQ_NONE;

	/* clear H_IS bit in H_CSR */
	mei_reg_write(dev, H_CSR, csr_reg);

	return IRQ_WAKE_THREAD;
}

/**
 * _mei_cmpl - processes completed operation.
 *
 * @cl: private data of the file object.
 * @cb_pos: callback block.
 */
static void _mei_cmpl(struct mei_cl *cl, struct mei_cl_cb *cb_pos)
{
60
	if (cb_pos->fop_type == MEI_FOP_WRITE) {
61
		mei_io_cb_free(cb_pos);
O
Oren Weil 已提交
62 63 64 65 66
		cb_pos = NULL;
		cl->writing_state = MEI_WRITE_COMPLETE;
		if (waitqueue_active(&cl->tx_wait))
			wake_up_interruptible(&cl->tx_wait);

67
	} else if (cb_pos->fop_type == MEI_FOP_READ &&
O
Oren Weil 已提交
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
			MEI_READING == cl->reading_state) {
		cl->reading_state = MEI_READ_COMPLETE;
		if (waitqueue_active(&cl->rx_wait))
			wake_up_interruptible(&cl->rx_wait);

	}
}

/**
 * _mei_irq_thread_state_ok - checks if mei header matches file private data
 *
 * @cl: private data of the file object
 * @mei_hdr: header of mei client message
 *
 * returns !=0 if matches, 0 if no match.
 */
static int _mei_irq_thread_state_ok(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 &&
		cl->state == MEI_FILE_CONNECTED &&
		MEI_READ_COMPLETE != cl->reading_state);
}

/**
 * mei_irq_thread_read_client_message - bottom half read routine after ISR to
 * handle the read mei client message data processing.
 *
 * @complete_list: An instance of our list structure
 * @dev: the device structure
 * @mei_hdr: header of mei client message
 *
 * returns 0 on success, <0 on failure.
 */
103
static int mei_irq_thread_read_client_message(struct mei_cl_cb *complete_list,
O
Oren Weil 已提交
104 105 106 107 108
		struct mei_device *dev,
		struct mei_msg_hdr *mei_hdr)
{
	struct mei_cl *cl;
	struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
109
	unsigned char *buffer = NULL;
O
Oren Weil 已提交
110 111

	dev_dbg(&dev->pdev->dev, "start client msg\n");
112
	if (list_empty(&dev->read_list.list))
O
Oren Weil 已提交
113 114
		goto quit;

115
	list_for_each_entry_safe(cb_pos, cb_next, &dev->read_list.list, list) {
116
		cl = cb_pos->cl;
O
Oren Weil 已提交
117 118
		if (cl && _mei_irq_thread_state_ok(cl, mei_hdr)) {
			cl->reading_state = MEI_READING;
119
			buffer = cb_pos->response_buffer.data + cb_pos->buf_idx;
O
Oren Weil 已提交
120 121

			if (cb_pos->response_buffer.size <
122
					mei_hdr->length + cb_pos->buf_idx) {
O
Oren Weil 已提交
123
				dev_dbg(&dev->pdev->dev, "message overflow.\n");
124
				list_del(&cb_pos->list);
O
Oren Weil 已提交
125 126 127 128 129
				return -ENOMEM;
			}
			if (buffer)
				mei_read_slots(dev, buffer, mei_hdr->length);

130
			cb_pos->buf_idx += mei_hdr->length;
O
Oren Weil 已提交
131 132
			if (mei_hdr->msg_complete) {
				cl->status = 0;
133
				list_del(&cb_pos->list);
O
Oren Weil 已提交
134
				dev_dbg(&dev->pdev->dev,
135
					"completed read H cl = %d, ME cl = %d, length = %lu\n",
O
Oren Weil 已提交
136 137
					cl->host_client_id,
					cl->me_client_id,
138 139
					cb_pos->buf_idx);

140 141
				list_add_tail(&cb_pos->list,
						&complete_list->list);
O
Oren Weil 已提交
142 143 144 145 146 147 148 149 150 151
			}

			break;
		}

	}

quit:
	dev_dbg(&dev->pdev->dev, "message read\n");
	if (!buffer) {
152
		mei_read_slots(dev, dev->rd_msg_buf, mei_hdr->length);
O
Oren Weil 已提交
153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173
		dev_dbg(&dev->pdev->dev, "discarding message, header =%08x.\n",
				*(u32 *) dev->rd_msg_buf);
	}

	return 0;
}

/**
 * _mei_irq_thread_close - processes close related operation.
 *
 * @dev: the device structure.
 * @slots: free slots.
 * @cb_pos: callback block.
 * @cl: private data of the file object.
 * @cmpl_list: complete list.
 *
 * returns 0, OK; otherwise, error.
 */
static int _mei_irq_thread_close(struct mei_device *dev, s32 *slots,
				struct mei_cl_cb *cb_pos,
				struct mei_cl *cl,
174
				struct mei_cl_cb *cmpl_list)
O
Oren Weil 已提交
175
{
176
	if ((*slots * sizeof(u32)) < (sizeof(struct mei_msg_hdr) +
177
			sizeof(struct hbm_client_connect_request)))
178
		return -EBADMSG;
O
Oren Weil 已提交
179

180
	*slots -= mei_data2slots(sizeof(struct hbm_client_connect_request));
181 182 183

	if (mei_disconnect(dev, cl)) {
		cl->status = 0;
184
		cb_pos->buf_idx = 0;
185
		list_move_tail(&cb_pos->list, &cmpl_list->list);
186
		return -EMSGSIZE;
O
Oren Weil 已提交
187
	} else {
188 189
		cl->state = MEI_FILE_DISCONNECTING;
		cl->status = 0;
190
		cb_pos->buf_idx = 0;
191
		list_move_tail(&cb_pos->list, &dev->ctrl_rd_list.list);
192
		cl->timer_count = MEI_CONNECT_TIMEOUT;
O
Oren Weil 已提交
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
	}

	return 0;
}

/**
 * is_treat_specially_client - checks if the message belongs
 * to the file private data.
 *
 * @cl: private data of the file object
 * @rs: connect response bus message
 *
 */
static bool is_treat_specially_client(struct mei_cl *cl,
		struct hbm_client_connect_response *rs)
{

	if (cl->host_client_id == rs->host_addr &&
	    cl->me_client_id == rs->me_addr) {
		if (!rs->status) {
			cl->state = MEI_FILE_CONNECTED;
			cl->status = 0;

		} else {
			cl->state = MEI_FILE_DISCONNECTED;
			cl->status = -ENODEV;
		}
		cl->timer_count = 0;

		return true;
	}
	return false;
}

/**
 * mei_client_connect_response - connects to response irq routine
 *
 * @dev: the device structure
 * @rs: connect response bus message
 */
static void mei_client_connect_response(struct mei_device *dev,
		struct hbm_client_connect_response *rs)
{

	struct mei_cl *cl;
238
	struct mei_cl_cb *pos = NULL, *next = NULL;
O
Oren Weil 已提交
239 240 241 242 243 244 245 246 247 248 249 250 251 252

	dev_dbg(&dev->pdev->dev,
			"connect_response:\n"
			"ME Client = %d\n"
			"Host Client = %d\n"
			"Status = %d\n",
			rs->me_addr,
			rs->host_addr,
			rs->status);

	/* if WD or iamthif client treat specially */

	if (is_treat_specially_client(&(dev->wd_cl), rs)) {
		dev_dbg(&dev->pdev->dev, "successfully connected to WD client.\n");
253
		mei_watchdog_register(dev);
254

255
		/* next step in the state maching */
256
		mei_amthif_host_init(dev);
O
Oren Weil 已提交
257 258 259 260 261 262 263
		return;
	}

	if (is_treat_specially_client(&(dev->iamthif_cl), rs)) {
		dev->iamthif_state = MEI_IAMTHIF_IDLE;
		return;
	}
264
	list_for_each_entry_safe(pos, next, &dev->ctrl_rd_list.list, list) {
265

266
		cl = pos->cl;
267
		if (!cl) {
268
			list_del(&pos->list);
269 270
			return;
		}
271
		if (pos->fop_type == MEI_FOP_IOCTL) {
272
			if (is_treat_specially_client(cl, rs)) {
273
				list_del(&pos->list);
274 275 276
				cl->status = 0;
				cl->timer_count = 0;
				break;
O
Oren Weil 已提交
277 278 279 280 281 282 283 284 285 286 287 288 289 290 291
			}
		}
	}
}

/**
 * mei_client_disconnect_response - disconnects from response irq routine
 *
 * @dev: the device structure
 * @rs: disconnect response bus message
 */
static void mei_client_disconnect_response(struct mei_device *dev,
					struct hbm_client_connect_response *rs)
{
	struct mei_cl *cl;
292
	struct mei_cl_cb *pos = NULL, *next = NULL;
O
Oren Weil 已提交
293 294 295 296 297 298 299 300 301 302

	dev_dbg(&dev->pdev->dev,
			"disconnect_response:\n"
			"ME Client = %d\n"
			"Host Client = %d\n"
			"Status = %d\n",
			rs->me_addr,
			rs->host_addr,
			rs->status);

303
	list_for_each_entry_safe(pos, next, &dev->ctrl_rd_list.list, list) {
304
		cl = pos->cl;
O
Oren Weil 已提交
305

306
		if (!cl) {
307
			list_del(&pos->list);
308 309
			return;
		}
O
Oren Weil 已提交
310

311 312 313
		dev_dbg(&dev->pdev->dev, "list_for_each_entry_safe in ctrl_rd_list.\n");
		if (cl->host_client_id == rs->host_addr &&
		    cl->me_client_id == rs->me_addr) {
O
Oren Weil 已提交
314

315
			list_del(&pos->list);
316 317
			if (!rs->status)
				cl->state = MEI_FILE_DISCONNECTED;
O
Oren Weil 已提交
318

319 320 321
			cl->status = 0;
			cl->timer_count = 0;
			break;
O
Oren Weil 已提交
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
		}
	}
}

/**
 * same_flow_addr - tells if they have the same address.
 *
 * @file: private data of the file object.
 * @flow: flow control.
 *
 * returns  !=0, same; 0,not.
 */
static int same_flow_addr(struct mei_cl *cl, struct hbm_flow_control *flow)
{
	return (cl->host_client_id == flow->host_addr &&
		cl->me_client_id == flow->me_addr);
}

/**
 * add_single_flow_creds - adds single buffer credentials.
 *
 * @file: private data ot the file object.
 * @flow: flow control.
 */
static void add_single_flow_creds(struct mei_device *dev,
				  struct hbm_flow_control *flow)
{
	struct mei_me_client *client;
	int i;

352
	for (i = 0; i < dev->me_clients_num; i++) {
O
Oren Weil 已提交
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
		client = &dev->me_clients[i];
		if (client && flow->me_addr == client->client_id) {
			if (client->props.single_recv_buf) {
				client->mei_flow_ctrl_creds++;
				dev_dbg(&dev->pdev->dev, "recv flow ctrl msg ME %d (single).\n",
				    flow->me_addr);
				dev_dbg(&dev->pdev->dev, "flow control credentials =%d.\n",
				    client->mei_flow_ctrl_creds);
			} else {
				BUG();	/* error in flow control */
			}
		}
	}
}

/**
 * mei_client_flow_control_response - flow control response irq routine
 *
 * @dev: the device structure
 * @flow_control: flow control response bus message
 */
static void mei_client_flow_control_response(struct mei_device *dev,
		struct hbm_flow_control *flow_control)
{
	struct mei_cl *cl_pos = NULL;
	struct mei_cl *cl_next = NULL;

	if (!flow_control->host_addr) {
		/* single receive buffer */
		add_single_flow_creds(dev, flow_control);
	} else {
		/* normal connection */
		list_for_each_entry_safe(cl_pos, cl_next,
				&dev->file_list, link) {
			dev_dbg(&dev->pdev->dev, "list_for_each_entry_safe in file_list\n");

			dev_dbg(&dev->pdev->dev, "cl of host client %d ME client %d.\n",
			    cl_pos->host_client_id,
			    cl_pos->me_client_id);
			dev_dbg(&dev->pdev->dev, "flow ctrl msg for host %d ME %d.\n",
			    flow_control->host_addr,
			    flow_control->me_addr);
			if (same_flow_addr(cl_pos, flow_control)) {
				dev_dbg(&dev->pdev->dev, "recv ctrl msg for host  %d ME %d.\n",
				    flow_control->host_addr,
				    flow_control->me_addr);
				cl_pos->mei_flow_ctrl_creds++;
				dev_dbg(&dev->pdev->dev, "flow control credentials = %d.\n",
				    cl_pos->mei_flow_ctrl_creds);
				break;
			}
		}
	}
}

/**
 * same_disconn_addr - tells if they have the same address
 *
 * @file: private data of the file object.
 * @disconn: disconnection request.
 *
 * returns !=0, same; 0,not.
 */
static int same_disconn_addr(struct mei_cl *cl,
417
			     struct hbm_client_connect_request *req)
O
Oren Weil 已提交
418
{
419 420
	return (cl->host_client_id == req->host_addr &&
		cl->me_client_id == req->me_addr);
O
Oren Weil 已提交
421 422 423 424 425 426 427 428 429
}

/**
 * mei_client_disconnect_request - disconnects from request irq routine
 *
 * @dev: the device structure.
 * @disconnect_req: disconnect request bus message.
 */
static void mei_client_disconnect_request(struct mei_device *dev,
430
		struct hbm_client_connect_request *disconnect_req)
O
Oren Weil 已提交
431 432
{
	struct hbm_client_connect_response *disconnect_res;
433 434
	struct mei_cl *pos, *next;
	const size_t len = sizeof(struct hbm_client_connect_response);
O
Oren Weil 已提交
435

436 437
	list_for_each_entry_safe(pos, next, &dev->file_list, link) {
		if (same_disconn_addr(pos, disconnect_req)) {
O
Oren Weil 已提交
438 439 440
			dev_dbg(&dev->pdev->dev, "disconnect request host client %d ME client %d.\n",
					disconnect_req->host_addr,
					disconnect_req->me_addr);
441 442 443
			pos->state = MEI_FILE_DISCONNECTED;
			pos->timer_count = 0;
			if (pos == &dev->wd_cl)
444
				dev->wd_pending = false;
445
			else if (pos == &dev->iamthif_cl)
O
Oren Weil 已提交
446 447 448
				dev->iamthif_timer = 0;

			/* prepare disconnect response */
449
			(void)mei_hbm_hdr(&dev->ext_msg_buf[0], len);
O
Oren Weil 已提交
450 451 452
			disconnect_res =
				(struct hbm_client_connect_response *)
				&dev->ext_msg_buf[1];
453
			disconnect_res->hbm_cmd = CLIENT_DISCONNECT_RES_CMD;
454 455
			disconnect_res->host_addr = pos->host_client_id;
			disconnect_res->me_addr = pos->me_client_id;
O
Oren Weil 已提交
456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476
			disconnect_res->status = 0;
			dev->extra_write_index = 2;
			break;
		}
	}
}

/**
 * mei_irq_thread_read_bus_message - bottom half read routine after ISR to
 * handle the read bus message cmd processing.
 *
 * @dev: the device structure
 * @mei_hdr: header of bus message
 */
static void mei_irq_thread_read_bus_message(struct mei_device *dev,
		struct mei_msg_hdr *mei_hdr)
{
	struct mei_bus_message *mei_msg;
	struct hbm_host_version_response *version_res;
	struct hbm_client_connect_response *connect_res;
	struct hbm_client_connect_response *disconnect_res;
477
	struct hbm_client_connect_request *disconnect_req;
O
Oren Weil 已提交
478 479 480
	struct hbm_flow_control *flow_control;
	struct hbm_props_response *props_res;
	struct hbm_host_enum_response *enum_res;
481
	struct hbm_host_stop_request *stop_req;
482
	int res;
O
Oren Weil 已提交
483 484 485 486


	/* read the message to our buffer */
	BUG_ON(mei_hdr->length >= sizeof(dev->rd_msg_buf));
487 488
	mei_read_slots(dev, dev->rd_msg_buf, mei_hdr->length);
	mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
O
Oren Weil 已提交
489

490
	switch (mei_msg->hbm_cmd) {
O
Oren Weil 已提交
491 492 493 494 495
	case HOST_START_RES_CMD:
		version_res = (struct hbm_host_version_response *) mei_msg;
		if (version_res->host_version_supported) {
			dev->version.major_version = HBM_MAJOR_VERSION;
			dev->version.minor_version = HBM_MINOR_VERSION;
496
			if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
O
Oren Weil 已提交
497 498
			    dev->init_clients_state == MEI_START_MESSAGE) {
				dev->init_clients_timer = 0;
499
				mei_host_enum_clients_message(dev);
O
Oren Weil 已提交
500
			} else {
501
				dev->recvd_msg = false;
O
Oren Weil 已提交
502 503 504 505 506
				dev_dbg(&dev->pdev->dev, "IMEI reset due to received host start response bus message.\n");
				mei_reset(dev, 1);
				return;
			}
		} else {
507 508 509
			u32 *buf = dev->wr_msg_buf;
			const size_t len = sizeof(struct hbm_host_stop_request);

O
Oren Weil 已提交
510
			dev->version = version_res->me_max_version;
511

O
Oren Weil 已提交
512
			/* send stop message */
513 514 515 516 517 518
			mei_hdr = mei_hbm_hdr(&buf[0], len);
			stop_req = (struct hbm_host_stop_request *)&buf[1];
			memset(stop_req, 0, len);
			stop_req->hbm_cmd = HOST_STOP_REQ_CMD;
			stop_req->reason = DRIVER_STOP_REQUEST;

O
Oren Weil 已提交
519
			mei_write_message(dev, mei_hdr,
520
					(unsigned char *)stop_req, len);
O
Oren Weil 已提交
521 522 523 524
			dev_dbg(&dev->pdev->dev, "version mismatch.\n");
			return;
		}

525
		dev->recvd_msg = true;
O
Oren Weil 已提交
526 527 528 529
		dev_dbg(&dev->pdev->dev, "host start response message received.\n");
		break;

	case CLIENT_CONNECT_RES_CMD:
530
		connect_res = (struct hbm_client_connect_response *) mei_msg;
O
Oren Weil 已提交
531 532 533 534 535 536
		mei_client_connect_response(dev, connect_res);
		dev_dbg(&dev->pdev->dev, "client connect response message received.\n");
		wake_up(&dev->wait_recvd_msg);
		break;

	case CLIENT_DISCONNECT_RES_CMD:
537
		disconnect_res = (struct hbm_client_connect_response *) mei_msg;
538
		mei_client_disconnect_response(dev, disconnect_res);
O
Oren Weil 已提交
539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555
		dev_dbg(&dev->pdev->dev, "client disconnect response message received.\n");
		wake_up(&dev->wait_recvd_msg);
		break;

	case MEI_FLOW_CONTROL_CMD:
		flow_control = (struct hbm_flow_control *) mei_msg;
		mei_client_flow_control_response(dev, flow_control);
		dev_dbg(&dev->pdev->dev, "client flow control response message received.\n");
		break;

	case HOST_CLIENT_PROPERTIES_RES_CMD:
		props_res = (struct hbm_props_response *)mei_msg;
		if (props_res->status || !dev->me_clients) {
			dev_dbg(&dev->pdev->dev, "reset due to received host client properties response bus message wrong status.\n");
			mei_reset(dev, 1);
			return;
		}
556
		if (dev->me_clients[dev->me_client_presentation_num]
O
Oren Weil 已提交
557 558 559 560 561
					.client_id == props_res->address) {

			dev->me_clients[dev->me_client_presentation_num].props
						= props_res->client_properties;

562
			if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
O
Oren Weil 已提交
563 564 565 566
			    dev->init_clients_state ==
					MEI_CLIENT_PROPERTIES_MESSAGE) {
				dev->me_client_index++;
				dev->me_client_presentation_num++;
567

568
				/** Send Client Properties request **/
569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588
				res = mei_host_client_properties(dev);
				if (res < 0) {
					dev_dbg(&dev->pdev->dev, "mei_host_client_properties() failed");
					return;
				} else if (!res) {
					/*
					 * No more clients to send to.
					 * Clear Map for indicating now ME clients
					 * with associated host client
					 */
					bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
					dev->open_handle_count = 0;

					/*
					 * Reserving the first three client IDs
					 * Client Id 0 - Reserved for MEI Bus Message communications
					 * Client Id 1 - Reserved for Watchdog
					 * Client ID 2 - Reserved for AMTHI
					 */
					bitmap_set(dev->host_clients_map, 0, 3);
589
					dev->dev_state = MEI_DEV_ENABLED;
590 591 592 593 594 595

					/* if wd initialization fails, initialization the AMTHI client,
					 * otherwise the AMTHI client will be initialized after the WD client connect response
					 * will be received
					 */
					if (mei_wd_host_init(dev))
596
						mei_amthif_host_init(dev);
597 598
				}

O
Oren Weil 已提交
599 600 601 602 603 604 605 606 607 608 609 610 611 612 613
			} else {
				dev_dbg(&dev->pdev->dev, "reset due to received host client properties response bus message");
				mei_reset(dev, 1);
				return;
			}
		} else {
			dev_dbg(&dev->pdev->dev, "reset due to received host client properties response bus message for wrong client ID\n");
			mei_reset(dev, 1);
			return;
		}
		break;

	case HOST_ENUM_RES_CMD:
		enum_res = (struct hbm_host_enum_response *) mei_msg;
		memcpy(dev->me_clients_map, enum_res->valid_addresses, 32);
614
		if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
O
Oren Weil 已提交
615 616 617 618
		    dev->init_clients_state == MEI_ENUM_CLIENTS_MESSAGE) {
				dev->init_clients_timer = 0;
				dev->me_client_presentation_num = 0;
				dev->me_client_index = 0;
619
				mei_allocate_me_clients_storage(dev);
O
Oren Weil 已提交
620 621
				dev->init_clients_state =
					MEI_CLIENT_PROPERTIES_MESSAGE;
622
				mei_host_client_properties(dev);
O
Oren Weil 已提交
623 624 625 626 627 628 629 630
		} else {
			dev_dbg(&dev->pdev->dev, "reset due to received host enumeration clients response bus message.\n");
			mei_reset(dev, 1);
			return;
		}
		break;

	case HOST_STOP_RES_CMD:
631
		dev->dev_state = MEI_DEV_DISABLED;
O
Oren Weil 已提交
632 633 634 635 636 637
		dev_dbg(&dev->pdev->dev, "resetting because of FW stop response.\n");
		mei_reset(dev, 1);
		break;

	case CLIENT_DISCONNECT_REQ_CMD:
		/* search for client */
638
		disconnect_req = (struct hbm_client_connect_request *)mei_msg;
O
Oren Weil 已提交
639 640 641 642
		mei_client_disconnect_request(dev, disconnect_req);
		break;

	case ME_STOP_REQ_CMD:
643 644 645 646 647 648 649 650 651 652 653 654
	{
		/* prepare stop request: sent in next interrupt event */

		u32 *buf = dev->ext_msg_buf;
		const size_t len = sizeof(struct hbm_host_stop_request);

		mei_hdr = mei_hbm_hdr(&buf[0], len);
		stop_req = (struct hbm_host_stop_request *)&buf[1];
		memset(stop_req, 0, len);
		stop_req->hbm_cmd = HOST_STOP_REQ_CMD;
		stop_req->reason = DRIVER_STOP_REQUEST;

O
Oren Weil 已提交
655 656
		dev->extra_write_index = 2;
		break;
657
	}
O
Oren Weil 已提交
658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679
	default:
		BUG();
		break;

	}
}


/**
 * _mei_hb_read - processes read related operation.
 *
 * @dev: the device structure.
 * @slots: free slots.
 * @cb_pos: callback block.
 * @cl: private data of the file object.
 * @cmpl_list: complete list.
 *
 * returns 0, OK; otherwise, error.
 */
static int _mei_irq_thread_read(struct mei_device *dev,	s32 *slots,
			struct mei_cl_cb *cb_pos,
			struct mei_cl *cl,
680
			struct mei_cl_cb *cmpl_list)
O
Oren Weil 已提交
681
{
T
Tomas Winkler 已提交
682
	if ((*slots * sizeof(u32)) < (sizeof(struct mei_msg_hdr) +
O
Oren Weil 已提交
683 684
			sizeof(struct hbm_flow_control))) {
		/* return the cancel routine */
685
		list_del(&cb_pos->list);
O
Oren Weil 已提交
686 687 688
		return -EBADMSG;
	}

689 690
	*slots -= mei_data2slots(sizeof(struct hbm_flow_control));

691 692
	if (mei_send_flow_control(dev, cl)) {
		cl->status = -ENODEV;
693
		cb_pos->buf_idx = 0;
694
		list_move_tail(&cb_pos->list, &cmpl_list->list);
695 696
		return -ENODEV;
	}
697
	list_move_tail(&cb_pos->list, &dev->read_list.list);
698

O
Oren Weil 已提交
699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716
	return 0;
}


/**
 * _mei_irq_thread_ioctl - processes ioctl related operation.
 *
 * @dev: the device structure.
 * @slots: free slots.
 * @cb_pos: callback block.
 * @cl: private data of the file object.
 * @cmpl_list: complete list.
 *
 * returns 0, OK; otherwise, error.
 */
static int _mei_irq_thread_ioctl(struct mei_device *dev, s32 *slots,
			struct mei_cl_cb *cb_pos,
			struct mei_cl *cl,
717
			struct mei_cl_cb *cmpl_list)
O
Oren Weil 已提交
718
{
719
	if ((*slots * sizeof(u32)) < (sizeof(struct mei_msg_hdr) +
O
Oren Weil 已提交
720 721
			sizeof(struct hbm_client_connect_request))) {
		/* return the cancel routine */
722
		list_del(&cb_pos->list);
O
Oren Weil 已提交
723 724 725
		return -EBADMSG;
	}

726 727 728 729
	cl->state = MEI_FILE_CONNECTING;
	 *slots -= mei_data2slots(sizeof(struct hbm_client_connect_request));
	if (mei_connect(dev, cl)) {
		cl->status = -ENODEV;
730
		cb_pos->buf_idx = 0;
731
		list_del(&cb_pos->list);
732 733
		return -ENODEV;
	} else {
734
		list_move_tail(&cb_pos->list, &dev->ctrl_rd_list.list);
735 736
		cl->timer_count = MEI_CONNECT_TIMEOUT;
	}
O
Oren Weil 已提交
737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753
	return 0;
}

/**
 * _mei_irq_thread_cmpl - processes completed and no-iamthif operation.
 *
 * @dev: the device structure.
 * @slots: free slots.
 * @cb_pos: callback block.
 * @cl: private data of the file object.
 * @cmpl_list: complete list.
 *
 * returns 0, OK; otherwise, error.
 */
static int _mei_irq_thread_cmpl(struct mei_device *dev,	s32 *slots,
			struct mei_cl_cb *cb_pos,
			struct mei_cl *cl,
754
			struct mei_cl_cb *cmpl_list)
O
Oren Weil 已提交
755 756 757 758
{
	struct mei_msg_hdr *mei_hdr;

	if ((*slots * sizeof(u32)) >= (sizeof(struct mei_msg_hdr) +
759
			(cb_pos->request_buffer.size - cb_pos->buf_idx))) {
O
Oren Weil 已提交
760 761 762
		mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
		mei_hdr->host_addr = cl->host_client_id;
		mei_hdr->me_addr = cl->me_client_id;
763
		mei_hdr->length = cb_pos->request_buffer.size - cb_pos->buf_idx;
O
Oren Weil 已提交
764 765 766 767 768 769
		mei_hdr->msg_complete = 1;
		mei_hdr->reserved = 0;
		dev_dbg(&dev->pdev->dev, "cb_pos->request_buffer.size =%d"
			"mei_hdr->msg_complete = %d\n",
				cb_pos->request_buffer.size,
				mei_hdr->msg_complete);
770 771
		dev_dbg(&dev->pdev->dev, "cb_pos->buf_idx  =%lu\n",
				cb_pos->buf_idx);
O
Oren Weil 已提交
772 773
		dev_dbg(&dev->pdev->dev, "mei_hdr->length  =%d\n",
				mei_hdr->length);
774
		*slots -= mei_data2slots(mei_hdr->length);
775
		if (mei_write_message(dev, mei_hdr,
O
Oren Weil 已提交
776 777
				(unsigned char *)
				(cb_pos->request_buffer.data +
778
				cb_pos->buf_idx),
O
Oren Weil 已提交
779 780
				mei_hdr->length)) {
			cl->status = -ENODEV;
781
			list_move_tail(&cb_pos->list, &cmpl_list->list);
O
Oren Weil 已提交
782 783 784 785 786
			return -ENODEV;
		} else {
			if (mei_flow_ctrl_reduce(dev, cl))
				return -ENODEV;
			cl->status = 0;
787
			cb_pos->buf_idx += mei_hdr->length;
788
			list_move_tail(&cb_pos->list, &dev->write_waiting_list.list);
O
Oren Weil 已提交
789
		}
790
	} else if (*slots == dev->hbuf_depth) {
O
Oren Weil 已提交
791 792 793 794 795 796 797 798
		/* buffer is still empty */
		mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
		mei_hdr->host_addr = cl->host_client_id;
		mei_hdr->me_addr = cl->me_client_id;
		mei_hdr->length =
			(*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
		mei_hdr->msg_complete = 0;
		mei_hdr->reserved = 0;
799
		*slots -= mei_data2slots(mei_hdr->length);
800
		if (mei_write_message(dev, mei_hdr,
O
Oren Weil 已提交
801 802
					(unsigned char *)
					(cb_pos->request_buffer.data +
803
					cb_pos->buf_idx),
O
Oren Weil 已提交
804 805
					mei_hdr->length)) {
			cl->status = -ENODEV;
806
			list_move_tail(&cb_pos->list, &cmpl_list->list);
O
Oren Weil 已提交
807 808
			return -ENODEV;
		} else {
809
			cb_pos->buf_idx += mei_hdr->length;
O
Oren Weil 已提交
810 811 812 813 814
			dev_dbg(&dev->pdev->dev,
					"cb_pos->request_buffer.size =%d"
					" mei_hdr->msg_complete = %d\n",
					cb_pos->request_buffer.size,
					mei_hdr->msg_complete);
815 816
			dev_dbg(&dev->pdev->dev, "cb_pos->buf_idx  =%lu\n",
					cb_pos->buf_idx);
O
Oren Weil 已提交
817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837
			dev_dbg(&dev->pdev->dev, "mei_hdr->length  =%d\n",
					mei_hdr->length);
		}
		return -EMSGSIZE;
	} else {
		return -EBADMSG;
	}

	return 0;
}

/**
 * mei_irq_thread_read_handler - bottom half read routine after ISR to
 * handle the read processing.
 *
 * @cmpl_list: An instance of our list structure
 * @dev: the device structure
 * @slots: slots to read.
 *
 * returns 0 on success, <0 on failure.
 */
838
static int mei_irq_thread_read_handler(struct mei_cl_cb *cmpl_list,
O
Oren Weil 已提交
839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900
		struct mei_device *dev,
		s32 *slots)
{
	struct mei_msg_hdr *mei_hdr;
	struct mei_cl *cl_pos = NULL;
	struct mei_cl *cl_next = NULL;
	int ret = 0;

	if (!dev->rd_msg_hdr) {
		dev->rd_msg_hdr = mei_mecbrw_read(dev);
		dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
		(*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->length =%d\n", mei_hdr->length);

	if (mei_hdr->reserved || !dev->rd_msg_hdr) {
		dev_dbg(&dev->pdev->dev, "corrupted message header.\n");
		ret = -EBADMSG;
		goto end;
	}

	if (mei_hdr->host_addr || mei_hdr->me_addr) {
		list_for_each_entry_safe(cl_pos, cl_next,
					&dev->file_list, link) {
			dev_dbg(&dev->pdev->dev,
					"list_for_each_entry_safe read host"
					" client = %d, ME client = %d\n",
					cl_pos->host_client_id,
					cl_pos->me_client_id);
			if (cl_pos->host_client_id == mei_hdr->host_addr &&
			    cl_pos->me_client_id == mei_hdr->me_addr)
				break;
		}

		if (&cl_pos->link == &dev->file_list) {
			dev_dbg(&dev->pdev->dev, "corrupted message header\n");
			ret = -EBADMSG;
			goto end;
		}
	}
	if (((*slots) * sizeof(u32)) < mei_hdr->length) {
		dev_dbg(&dev->pdev->dev,
				"we can't read the message slots =%08x.\n",
				*slots);
		/* we can't read the message */
		ret = -ERANGE;
		goto end;
	}

	/* decide where to read the message too */
	if (!mei_hdr->host_addr) {
		dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_bus_message.\n");
		mei_irq_thread_read_bus_message(dev, mei_hdr);
		dev_dbg(&dev->pdev->dev, "end mei_irq_thread_read_bus_message.\n");
	} else if (mei_hdr->host_addr == dev->iamthif_cl.host_client_id &&
		   (MEI_FILE_CONNECTED == dev->iamthif_cl.state) &&
		   (dev->iamthif_state == MEI_IAMTHIF_READING)) {
		dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_iamthif_message.\n");
		dev_dbg(&dev->pdev->dev, "mei_hdr->length =%d\n",
				mei_hdr->length);
901 902

		ret = mei_amthif_irq_read_message(cmpl_list, dev, mei_hdr);
O
Oren Weil 已提交
903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940
		if (ret)
			goto end;

	} else {
		dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_client_message.\n");
		ret = mei_irq_thread_read_client_message(cmpl_list,
							 dev, mei_hdr);
		if (ret)
			goto end;

	}

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


/**
 * mei_irq_thread_write_handler - bottom half write routine after
 * ISR to handle the write processing.
 *
 * @cmpl_list: An instance of our list structure
 * @dev: the device structure
 * @slots: slots to write.
 *
 * returns 0 on success, <0 on failure.
 */
941 942
static int mei_irq_thread_write_handler(struct mei_cl_cb *cmpl_list,
		struct mei_device *dev, s32 *slots)
O
Oren Weil 已提交
943 944 945
{

	struct mei_cl *cl;
946
	struct mei_cl_cb *pos = NULL, *next = NULL;
947
	struct mei_cl_cb *list;
O
Oren Weil 已提交
948 949
	int ret;

950
	if (!mei_hbuf_is_empty(dev)) {
O
Oren Weil 已提交
951 952 953
		dev_dbg(&dev->pdev->dev, "host buffer is not empty.\n");
		return 0;
	}
954
	*slots = mei_hbuf_empty_slots(dev);
955 956 957
	if (*slots <= 0)
		return -EMSGSIZE;

O
Oren Weil 已提交
958 959 960 961
	/* complete all waiting for write CB */
	dev_dbg(&dev->pdev->dev, "complete all waiting for write cb.\n");

	list = &dev->write_waiting_list;
962
	list_for_each_entry_safe(pos, next, &list->list, list) {
963
		cl = pos->cl;
964 965 966 967
		if (cl == NULL)
			continue;

		cl->status = 0;
968
		list_del(&pos->list);
969
		if (MEI_WRITING == cl->writing_state &&
970 971
		    pos->fop_type == MEI_FOP_WRITE &&
		    cl != &dev->iamthif_cl) {
972
			dev_dbg(&dev->pdev->dev, "MEI WRITE COMPLETE\n");
973
			cl->writing_state = MEI_WRITE_COMPLETE;
974
			list_add_tail(&pos->list, &cmpl_list->list);
975 976 977 978
		}
		if (cl == &dev->iamthif_cl) {
			dev_dbg(&dev->pdev->dev, "check iamthif flow control.\n");
			if (dev->iamthif_flow_control_pending) {
979
				ret = mei_amthif_irq_read(dev, slots);
980 981
				if (ret)
					return ret;
O
Oren Weil 已提交
982 983 984 985
			}
		}
	}

986 987
	if (dev->wd_state == MEI_WD_STOPPING) {
		dev->wd_state = MEI_WD_IDLE;
O
Oren Weil 已提交
988 989 990 991 992 993 994 995 996 997 998 999 1000
		wake_up_interruptible(&dev->wait_stop_wd);
	}

	if (dev->extra_write_index) {
		dev_dbg(&dev->pdev->dev, "extra_write_index =%d.\n",
				dev->extra_write_index);
		mei_write_message(dev,
				(struct mei_msg_hdr *) &dev->ext_msg_buf[0],
				(unsigned char *) &dev->ext_msg_buf[1],
				(dev->extra_write_index - 1) * sizeof(u32));
		*slots -= dev->extra_write_index;
		dev->extra_write_index = 0;
	}
1001
	if (dev->dev_state == MEI_DEV_ENABLED) {
O
Oren Weil 已提交
1002
		if (dev->wd_pending &&
1003
		    mei_flow_ctrl_creds(dev, &dev->wd_cl) > 0) {
O
Oren Weil 已提交
1004 1005
			if (mei_wd_send(dev))
				dev_dbg(&dev->pdev->dev, "wd send failed.\n");
1006 1007
			else if (mei_flow_ctrl_reduce(dev, &dev->wd_cl))
				return -ENODEV;
O
Oren Weil 已提交
1008

1009
			dev->wd_pending = false;
O
Oren Weil 已提交
1010

1011
			if (dev->wd_state == MEI_WD_RUNNING)
1012
				*slots -= mei_data2slots(MEI_WD_START_MSG_SIZE);
1013
			else
1014
				*slots -= mei_data2slots(MEI_WD_STOP_MSG_SIZE);
O
Oren Weil 已提交
1015 1016 1017 1018
		}
	}

	/* complete control write list CB */
1019
	dev_dbg(&dev->pdev->dev, "complete control write list cb.\n");
1020
	list_for_each_entry_safe(pos, next, &dev->ctrl_wr_list.list, list) {
1021
		cl = pos->cl;
1022
		if (!cl) {
1023
			list_del(&pos->list);
1024 1025
			return -ENODEV;
		}
1026 1027
		switch (pos->fop_type) {
		case MEI_FOP_CLOSE:
1028
			/* send disconnect message */
1029
			ret = _mei_irq_thread_close(dev, slots, pos, cl, cmpl_list);
1030 1031
			if (ret)
				return ret;
O
Oren Weil 已提交
1032

1033
			break;
1034
		case MEI_FOP_READ:
1035
			/* send flow control message */
1036
			ret = _mei_irq_thread_read(dev, slots, pos, cl, cmpl_list);
1037 1038
			if (ret)
				return ret;
O
Oren Weil 已提交
1039

1040
			break;
1041
		case MEI_FOP_IOCTL:
1042
			/* connect message */
1043
			if (mei_other_client_is_connecting(dev, cl))
1044
				continue;
1045
			ret = _mei_irq_thread_ioctl(dev, slots, pos, cl, cmpl_list);
1046 1047
			if (ret)
				return ret;
O
Oren Weil 已提交
1048

1049
			break;
O
Oren Weil 已提交
1050

1051 1052
		default:
			BUG();
O
Oren Weil 已提交
1053
		}
1054

O
Oren Weil 已提交
1055 1056
	}
	/* complete  write list CB */
1057
	dev_dbg(&dev->pdev->dev, "complete write list cb.\n");
1058
	list_for_each_entry_safe(pos, next, &dev->write_list.list, list) {
1059
		cl = pos->cl;
1060 1061 1062 1063
		if (cl == NULL)
			continue;

		if (cl != &dev->iamthif_cl) {
1064
			if (mei_flow_ctrl_creds(dev, cl) <= 0) {
1065
				dev_dbg(&dev->pdev->dev,
1066 1067
					"No flow control credentials for client %d, not sending.\n",
					cl->host_client_id);
1068 1069
				continue;
			}
1070 1071
			ret = _mei_irq_thread_cmpl(dev, slots, pos,
						cl, cmpl_list);
1072 1073
			if (ret)
				return ret;
O
Oren Weil 已提交
1074

1075 1076 1077
		} else if (cl == &dev->iamthif_cl) {
			/* IAMTHIF IOCTL */
			dev_dbg(&dev->pdev->dev, "complete amthi write cb.\n");
1078
			if (mei_flow_ctrl_creds(dev, cl) <= 0) {
1079
				dev_dbg(&dev->pdev->dev,
1080 1081
					"No flow control credentials for amthi client %d.\n",
					cl->host_client_id);
1082
				continue;
O
Oren Weil 已提交
1083
			}
1084 1085
			ret = mei_amthif_irq_process_completed(dev, slots, pos,
								cl, cmpl_list);
1086 1087
			if (ret)
				return ret;
O
Oren Weil 已提交
1088 1089

		}
1090

O
Oren Weil 已提交
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103
	}
	return 0;
}



/**
 * mei_timer - timer function.
 *
 * @work: pointer to the work_struct structure
 *
 * NOTE: This function is called by timer interrupt work
 */
1104
void mei_timer(struct work_struct *work)
O
Oren Weil 已提交
1105 1106 1107 1108 1109 1110 1111 1112
{
	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,
1113
					struct mei_device, timer_work.work);
O
Oren Weil 已提交
1114 1115 1116


	mutex_lock(&dev->device_lock);
1117 1118
	if (dev->dev_state != MEI_DEV_ENABLED) {
		if (dev->dev_state == MEI_DEV_INIT_CLIENTS) {
O
Oren Weil 已提交
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
			if (dev->init_clients_timer) {
				if (--dev->init_clients_timer == 0) {
					dev_dbg(&dev->pdev->dev, "IMEI reset due to init clients timeout ,init clients state = %d.\n",
						dev->init_clients_state);
					mei_reset(dev, 1);
				}
			}
		}
		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_dbg(&dev->pdev->dev, "HECI reset due to connect/disconnect timeout.\n");
				mei_reset(dev, 1);
				goto out;
			}
		}
	}

	if (dev->iamthif_stall_timer) {
		if (--dev->iamthif_stall_timer == 0) {
1142
			dev_dbg(&dev->pdev->dev, "resetting because of hang to amthi.\n");
O
Oren Weil 已提交
1143 1144 1145
			mei_reset(dev, 1);
			dev->iamthif_msg_buf_size = 0;
			dev->iamthif_msg_buf_index = 0;
1146 1147
			dev->iamthif_canceled = false;
			dev->iamthif_ioctl = true;
O
Oren Weil 已提交
1148 1149 1150
			dev->iamthif_state = MEI_IAMTHIF_IDLE;
			dev->iamthif_timer = 0;

1151 1152
			mei_io_cb_free(dev->iamthif_current_cb);
			dev->iamthif_current_cb = NULL;
O
Oren Weil 已提交
1153 1154

			dev->iamthif_file_object = NULL;
1155
			mei_amthif_run_next_cmd(dev);
O
Oren Weil 已提交
1156 1157 1158 1159 1160 1161
		}
	}

	if (dev->iamthif_timer) {

		timeout = dev->iamthif_timer +
1162
			mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
O
Oren Weil 已提交
1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175

		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");

1176 1177
			list_for_each_entry_safe(cb_pos, cb_next,
				&dev->amthif_rd_complete_list.list, list) {
O
Oren Weil 已提交
1178

1179
				cl_pos = cb_pos->file_object->private_data;
O
Oren Weil 已提交
1180

1181 1182
				/* Finding the AMTHI entry. */
				if (cl_pos == &dev->iamthif_cl)
1183
					list_del(&cb_pos->list);
O
Oren Weil 已提交
1184
			}
1185 1186
			mei_io_cb_free(dev->iamthif_current_cb);
			dev->iamthif_current_cb = NULL;
O
Oren Weil 已提交
1187 1188 1189 1190

			dev->iamthif_file_object->private_data = NULL;
			dev->iamthif_file_object = NULL;
			dev->iamthif_timer = 0;
1191
			mei_amthif_run_next_cmd(dev);
O
Oren Weil 已提交
1192 1193 1194 1195

		}
	}
out:
1196 1197
	schedule_delayed_work(&dev->timer_work, 2 * HZ);
	mutex_unlock(&dev->device_lock);
O
Oren Weil 已提交
1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212
}

/**
 *  mei_interrupt_thread_handler - function called after ISR to handle the interrupt
 * processing.
 *
 * @irq: The irq number
 * @dev_id: pointer to the device structure
 *
 * returns irqreturn_t
 *
 */
irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id)
{
	struct mei_device *dev = (struct mei_device *) dev_id;
1213
	struct mei_cl_cb complete_list;
O
Oren Weil 已提交
1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
	struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
	struct mei_cl *cl;
	s32 slots;
	int rets;
	bool  bus_message_received;


	dev_dbg(&dev->pdev->dev, "function called after ISR to handle the interrupt processing.\n");
	/* initialize our complete list */
	mutex_lock(&dev->device_lock);
1224
	mei_io_list_init(&complete_list);
O
Oren Weil 已提交
1225
	dev->host_hw_state = mei_hcsr_read(dev);
1226 1227

	/* Ack the interrupt here
1228
	 * In case of MSI we don't go through the quick handler */
1229 1230 1231
	if (pci_dev_msi_enabled(dev->pdev))
		mei_reg_write(dev, H_CSR, dev->host_hw_state);

O
Oren Weil 已提交
1232 1233 1234 1235
	dev->me_hw_state = mei_mecsr_read(dev);

	/* check if ME wants a reset */
	if ((dev->me_hw_state & ME_RDY_HRA) == 0 &&
1236 1237
	    dev->dev_state != MEI_DEV_RESETING &&
	    dev->dev_state != MEI_DEV_INITIALIZING) {
O
Oren Weil 已提交
1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249
		dev_dbg(&dev->pdev->dev, "FW not ready.\n");
		mei_reset(dev, 1);
		mutex_unlock(&dev->device_lock);
		return IRQ_HANDLED;
	}

	/*  check if we need to start the dev */
	if ((dev->host_hw_state & H_RDY) == 0) {
		if ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA) {
			dev_dbg(&dev->pdev->dev, "we need to start the dev.\n");
			dev->host_hw_state |= (H_IE | H_IG | H_RDY);
			mei_hcsr_set(dev);
1250
			dev->dev_state = MEI_DEV_INIT_CLIENTS;
O
Oren Weil 已提交
1251 1252 1253 1254
			dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n");
			/* link is established
			 * start sending messages.
			 */
1255
			mei_host_start_message(dev);
O
Oren Weil 已提交
1256 1257 1258 1259 1260 1261 1262 1263
			mutex_unlock(&dev->device_lock);
			return IRQ_HANDLED;
		} else {
			dev_dbg(&dev->pdev->dev, "FW not ready.\n");
			mutex_unlock(&dev->device_lock);
			return IRQ_HANDLED;
		}
	}
1264
	/* check slots available for reading */
O
Oren Weil 已提交
1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279
	slots = mei_count_full_read_slots(dev);
	dev_dbg(&dev->pdev->dev, "slots =%08x  extra_write_index =%08x.\n",
		slots, dev->extra_write_index);
	while (slots > 0 && !dev->extra_write_index) {
		dev_dbg(&dev->pdev->dev, "slots =%08x  extra_write_index =%08x.\n",
				slots, dev->extra_write_index);
		dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_handler.\n");
		rets = mei_irq_thread_read_handler(&complete_list, dev, &slots);
		if (rets)
			goto end;
	}
	rets = mei_irq_thread_write_handler(&complete_list, dev, &slots);
end:
	dev_dbg(&dev->pdev->dev, "end of bottom half function.\n");
	dev->host_hw_state = mei_hcsr_read(dev);
1280
	dev->mei_host_buffer_is_empty = mei_hbuf_is_empty(dev);
O
Oren Weil 已提交
1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292

	bus_message_received = false;
	if (dev->recvd_msg && waitqueue_active(&dev->wait_recvd_msg)) {
		dev_dbg(&dev->pdev->dev, "received waiting bus message\n");
		bus_message_received = true;
	}
	mutex_unlock(&dev->device_lock);
	if (bus_message_received) {
		dev_dbg(&dev->pdev->dev, "wake up dev->wait_recvd_msg\n");
		wake_up_interruptible(&dev->wait_recvd_msg);
		bus_message_received = false;
	}
1293
	if (list_empty(&complete_list.list))
O
Oren Weil 已提交
1294 1295 1296
		return IRQ_HANDLED;


1297
	list_for_each_entry_safe(cb_pos, cb_next, &complete_list.list, list) {
1298
		cl = cb_pos->cl;
1299
		list_del(&cb_pos->list);
O
Oren Weil 已提交
1300 1301 1302 1303 1304 1305
		if (cl) {
			if (cl != &dev->iamthif_cl) {
				dev_dbg(&dev->pdev->dev, "completing call back.\n");
				_mei_cmpl(cl, cb_pos);
				cb_pos = NULL;
			} else if (cl == &dev->iamthif_cl) {
1306
				mei_amthif_complete(dev, cb_pos);
O
Oren Weil 已提交
1307 1308 1309 1310 1311
			}
		}
	}
	return IRQ_HANDLED;
}