drivers/misc/mei/interrupt.c

   1 /*
   2  *
   3  * Intel Management Engine Interface (Intel MEI) Linux driver
   4  * Copyright (c) 2003-2012, Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  */
  16
  17
  18 #include <linux/export.h>
  19 #include <linux/pci.h>
  20 #include <linux/kthread.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/fs.h>
  23 #include <linux/jiffies.h>
  24
  25 #include <linux/mei.h>
  26
  27 #include "mei_dev.h"
  28 #include "hbm.h"
  29 #include "hw-me.h"
  30 #include "client.h"
  31
  32
  33 /**
  34  * mei_cl_complete_handler - processes completed operation for a client
  35  *
  36  * @cl: private data of the file object.
  37  * @cb: callback block.
  38  */
  39 static void mei_cl_complete_handler(struct mei_cl *cl, struct mei_cl_cb *cb)
  40 {
  41         if (cb->fop_type == MEI_FOP_WRITE) {
  42                 mei_io_cb_free(cb);
  43                 cb = NULL;
  44                 cl->writing_state = MEI_WRITE_COMPLETE;
  45                 if (waitqueue_active(&cl->tx_wait))
  46                         wake_up_interruptible(&cl->tx_wait);
  47
  48         } else if (cb->fop_type == MEI_FOP_READ &&
  49                         MEI_READING == cl->reading_state) {
  50                 cl->reading_state = MEI_READ_COMPLETE;
  51                 if (waitqueue_active(&cl->rx_wait))
  52                         wake_up_interruptible(&cl->rx_wait);
  53                 else
  54                         mei_cl_bus_rx_event(cl);
  55
  56         }
  57 }
  58
  59 /**
  60  * mei_irq_compl_handler - dispatch complete handelers
  61  *      for the completed callbacks
  62  *
  63  * @dev - mei device
  64  * @compl_list - list of completed cbs
  65  */
  66 void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *compl_list)
  67 {
  68         struct mei_cl_cb *cb, *next;
  69         struct mei_cl *cl;
  70
  71         list_for_each_entry_safe(cb, next, &compl_list->list, list) {
  72                 cl = cb->cl;
  73                 list_del(&cb->list);
  74                 if (!cl)
  75                         continue;
  76
  77                 dev_dbg(&dev->pdev->dev, "completing call back.\n");
  78                 if (cl == &dev->iamthif_cl)
  79                         mei_amthif_complete(dev, cb);
  80                 else
  81                         mei_cl_complete_handler(cl, cb);
  82         }
  83 }
  84 EXPORT_SYMBOL_GPL(mei_irq_compl_handler);
  85 /**
  86  * _mei_irq_thread_state_ok - checks if mei header matches file private data
  87  *
  88  * @cl: private data of the file object
  89  * @mei_hdr: header of mei client message
  90  *
  91  * returns !=0 if matches, 0 if no match.
  92  */
  93 static int _mei_irq_thread_state_ok(struct mei_cl *cl,
  94                                 struct mei_msg_hdr *mei_hdr)
  95 {
  96         return (cl->host_client_id == mei_hdr->host_addr &&
  97                 cl->me_client_id == mei_hdr->me_addr &&
  98                 cl->state == MEI_FILE_CONNECTED &&
  99                 MEI_READ_COMPLETE != cl->reading_state);
 100 }
 101
 102 /**
 103  * mei_irq_thread_read_client_message - bottom half read routine after ISR to
 104  * handle the read mei client message data processing.
 105  *
 106  * @complete_list: An instance of our list structure
 107  * @dev: the device structure
 108  * @mei_hdr: header of mei client message
 109  *
 110  * returns 0 on success, <0 on failure.
 111  */
 112 static int mei_irq_thread_read_client_message(struct mei_cl_cb *complete_list,
 113                 struct mei_device *dev,
 114                 struct mei_msg_hdr *mei_hdr)
 115 {
 116         struct mei_cl *cl;
 117         struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
 118         unsigned char *buffer = NULL;
 119
 120         dev_dbg(&dev->pdev->dev, "start client msg\n");
 121         if (list_empty(&dev->read_list.list))
 122                 goto quit;
 123
 124         list_for_each_entry_safe(cb_pos, cb_next, &dev->read_list.list, list) {
 125                 cl = cb_pos->cl;
 126                 if (cl && _mei_irq_thread_state_ok(cl, mei_hdr)) {
 127                         cl->reading_state = MEI_READING;
 128                         buffer = cb_pos->response_buffer.data + cb_pos->buf_idx;
 129
 130                         if (cb_pos->response_buffer.size <
 131                                         mei_hdr->length + cb_pos->buf_idx) {
 132                                 dev_dbg(&dev->pdev->dev, "message overflow.\n");
 133                                 list_del(&cb_pos->list);
 134                                 return -ENOMEM;
 135                         }
 136                         if (buffer)
 137                                 mei_read_slots(dev, buffer, mei_hdr->length);
 138
 139                         cb_pos->buf_idx += mei_hdr->length;
 140                         if (mei_hdr->msg_complete) {
 141                                 cl->status = 0;
 142                                 list_del(&cb_pos->list);
 143                                 dev_dbg(&dev->pdev->dev,
 144                                         "completed read H cl = %d, ME cl = %d, length = %lu\n",
 145                                         cl->host_client_id,
 146                                         cl->me_client_id,
 147                                         cb_pos->buf_idx);
 148
 149                                 list_add_tail(&cb_pos->list,
 150                                                 &complete_list->list);
 151                         }
 152
 153                         break;
 154                 }
 155
 156         }
 157
 158 quit:
 159         dev_dbg(&dev->pdev->dev, "message read\n");
 160         if (!buffer) {
 161                 mei_read_slots(dev, dev->rd_msg_buf, mei_hdr->length);
 162                 dev_dbg(&dev->pdev->dev, "discarding message " MEI_HDR_FMT "\n",
 163                                 MEI_HDR_PRM(mei_hdr));
 164         }
 165
 166         return 0;
 167 }
 168
 169 /**
 170  * _mei_irq_thread_close - processes close related operation.
 171  *
 172  * @dev: the device structure.
 173  * @slots: free slots.
 174  * @cb_pos: callback block.
 175  * @cl: private data of the file object.
 176  * @cmpl_list: complete list.
 177  *
 178  * returns 0, OK; otherwise, error.
 179  */
 180 static int _mei_irq_thread_close(struct mei_device *dev, s32 *slots,
 181                                 struct mei_cl_cb *cb_pos,
 182                                 struct mei_cl *cl,
 183                                 struct mei_cl_cb *cmpl_list)
 184 {
 185         u32 msg_slots =
 186                 mei_data2slots(sizeof(struct hbm_client_connect_request));
 187
 188         if (*slots < msg_slots)
 189                 return -EMSGSIZE;
 190
 191         *slots -= msg_slots;
 192
 193         if (mei_hbm_cl_disconnect_req(dev, cl)) {
 194                 cl->status = 0;
 195                 cb_pos->buf_idx = 0;
 196                 list_move_tail(&cb_pos->list, &cmpl_list->list);
 197                 return -EIO;
 198         }
 199
 200         cl->state = MEI_FILE_DISCONNECTING;
 201         cl->status = 0;
 202         cb_pos->buf_idx = 0;
 203         list_move_tail(&cb_pos->list, &dev->ctrl_rd_list.list);
 204         cl->timer_count = MEI_CONNECT_TIMEOUT;
 205
 206         return 0;
 207 }
 208
 209
 210 /**
 211  * _mei_hb_read - processes read related operation.
 212  *
 213  * @dev: the device structure.
 214  * @slots: free slots.
 215  * @cb_pos: callback block.
 216  * @cl: private data of the file object.
 217  * @cmpl_list: complete list.
 218  *
 219  * returns 0, OK; otherwise, error.
 220  */
 221 static int _mei_irq_thread_read(struct mei_device *dev, s32 *slots,
 222                         struct mei_cl_cb *cb_pos,
 223                         struct mei_cl *cl,
 224                         struct mei_cl_cb *cmpl_list)
 225 {
 226         u32 msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));
 227
 228         if (*slots < msg_slots) {
 229                 /* return the cancel routine */
 230                 list_del(&cb_pos->list);
 231                 return -EMSGSIZE;
 232         }
 233
 234         *slots -= msg_slots;
 235
 236         if (mei_hbm_cl_flow_control_req(dev, cl)) {
 237                 cl->status = -ENODEV;
 238                 cb_pos->buf_idx = 0;
 239                 list_move_tail(&cb_pos->list, &cmpl_list->list);
 240                 return -ENODEV;
 241         }
 242         list_move_tail(&cb_pos->list, &dev->read_list.list);
 243
 244         return 0;
 245 }
 246
 247
 248 /**
 249  * _mei_irq_thread_ioctl - processes ioctl related operation.
 250  *
 251  * @dev: the device structure.
 252  * @slots: free slots.
 253  * @cb_pos: callback block.
 254  * @cl: private data of the file object.
 255  * @cmpl_list: complete list.
 256  *
 257  * returns 0, OK; otherwise, error.
 258  */
 259 static int _mei_irq_thread_ioctl(struct mei_device *dev, s32 *slots,
 260                         struct mei_cl_cb *cb_pos,
 261                         struct mei_cl *cl,
 262                         struct mei_cl_cb *cmpl_list)
 263 {
 264         u32 msg_slots =
 265                 mei_data2slots(sizeof(struct hbm_client_connect_request));
 266
 267         if (*slots < msg_slots) {
 268                 /* return the cancel routine */
 269                 list_del(&cb_pos->list);
 270                 return -EMSGSIZE;
 271         }
 272
 273         *slots -=  msg_slots;
 274
 275         cl->state = MEI_FILE_CONNECTING;
 276
 277         if (mei_hbm_cl_connect_req(dev, cl)) {
 278                 cl->status = -ENODEV;
 279                 cb_pos->buf_idx = 0;
 280                 list_del(&cb_pos->list);
 281                 return -ENODEV;
 282         } else {
 283                 list_move_tail(&cb_pos->list, &dev->ctrl_rd_list.list);
 284                 cl->timer_count = MEI_CONNECT_TIMEOUT;
 285         }
 286         return 0;
 287 }
 288
 289 /**
 290  * mei_irq_thread_write_complete - write messages to device.
 291  *
 292  * @dev: the device structure.
 293  * @slots: free slots.
 294  * @cb: callback block.
 295  * @cmpl_list: complete list.
 296  *
 297  * returns 0, OK; otherwise, error.
 298  */
 299 static int mei_irq_thread_write_complete(struct mei_device *dev, s32 *slots,
 300                         struct mei_cl_cb *cb, struct mei_cl_cb *cmpl_list)
 301 {
 302         struct mei_msg_hdr mei_hdr;
 303         struct mei_cl *cl = cb->cl;
 304         size_t len = cb->request_buffer.size - cb->buf_idx;
 305         u32 msg_slots = mei_data2slots(len);
 306
 307         mei_hdr.host_addr = cl->host_client_id;
 308         mei_hdr.me_addr = cl->me_client_id;
 309         mei_hdr.reserved = 0;
 310
 311         if (*slots >= msg_slots) {
 312                 mei_hdr.length = len;
 313                 mei_hdr.msg_complete = 1;
 314         /* Split the message only if we can write the whole host buffer */
 315         } else if (*slots == dev->hbuf_depth) {
 316                 msg_slots = *slots;
 317                 len = (*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
 318                 mei_hdr.length = len;
 319                 mei_hdr.msg_complete = 0;
 320         } else {
 321                 /* wait for next time the host buffer is empty */
 322                 return 0;
 323         }
 324
 325         dev_dbg(&dev->pdev->dev, "buf: size = %d idx = %lu\n",
 326                         cb->request_buffer.size, cb->buf_idx);
 327         dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(&mei_hdr));
 328
 329         *slots -=  msg_slots;
 330         if (mei_write_message(dev, &mei_hdr,
 331                         cb->request_buffer.data + cb->buf_idx)) {
 332                 cl->status = -ENODEV;
 333                 list_move_tail(&cb->list, &cmpl_list->list);
 334                 return -ENODEV;
 335         }
 336
 337         if (mei_cl_flow_ctrl_reduce(cl))
 338                 return -ENODEV;
 339
 340         cl->status = 0;
 341         cb->buf_idx += mei_hdr.length;
 342         if (mei_hdr.msg_complete)
 343                 list_move_tail(&cb->list, &dev->write_waiting_list.list);
 344
 345         return 0;
 346 }
 347
 348 /**
 349  * mei_irq_thread_read_handler - bottom half read routine after ISR to
 350  * handle the read processing.
 351  *
 352  * @dev: the device structure
 353  * @cmpl_list: An instance of our list structure
 354  * @slots: slots to read.
 355  *
 356  * returns 0 on success, <0 on failure.
 357  */
 358 int mei_irq_read_handler(struct mei_device *dev,
 359                 struct mei_cl_cb *cmpl_list, s32 *slots)
 360 {
 361         struct mei_msg_hdr *mei_hdr;
 362         struct mei_cl *cl_pos = NULL;
 363         struct mei_cl *cl_next = NULL;
 364         int ret = 0;
 365
 366         if (!dev->rd_msg_hdr) {
 367                 dev->rd_msg_hdr = mei_read_hdr(dev);
 368                 dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
 369                 (*slots)--;
 370                 dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
 371         }
 372         mei_hdr = (struct mei_msg_hdr *) &dev->rd_msg_hdr;
 373         dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
 374
 375         if (mei_hdr->reserved || !dev->rd_msg_hdr) {
 376                 dev_dbg(&dev->pdev->dev, "corrupted message header.\n");
 377                 ret = -EBADMSG;
 378                 goto end;
 379         }
 380
 381         if (mei_hdr->host_addr || mei_hdr->me_addr) {
 382                 list_for_each_entry_safe(cl_pos, cl_next,
 383                                         &dev->file_list, link) {
 384                         dev_dbg(&dev->pdev->dev,
 385                                         "list_for_each_entry_safe read host"
 386                                         " client = %d, ME client = %d\n",
 387                                         cl_pos->host_client_id,
 388                                         cl_pos->me_client_id);
 389                         if (cl_pos->host_client_id == mei_hdr->host_addr &&
 390                             cl_pos->me_client_id == mei_hdr->me_addr)
 391                                 break;
 392                 }
 393
 394                 if (&cl_pos->link == &dev->file_list) {
 395                         dev_dbg(&dev->pdev->dev, "corrupted message header\n");
 396                         ret = -EBADMSG;
 397                         goto end;
 398                 }
 399         }
 400         if (((*slots) * sizeof(u32)) < mei_hdr->length) {
 401                 dev_dbg(&dev->pdev->dev,
 402                                 "we can't read the message slots =%08x.\n",
 403                                 *slots);
 404                 /* we can't read the message */
 405                 ret = -ERANGE;
 406                 goto end;
 407         }
 408
 409         /* decide where to read the message too */
 410         if (!mei_hdr->host_addr) {
 411                 dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_bus_message.\n");
 412                 mei_hbm_dispatch(dev, mei_hdr);
 413                 dev_dbg(&dev->pdev->dev, "end mei_irq_thread_read_bus_message.\n");
 414         } else if (mei_hdr->host_addr == dev->iamthif_cl.host_client_id &&
 415                    (MEI_FILE_CONNECTED == dev->iamthif_cl.state) &&
 416                    (dev->iamthif_state == MEI_IAMTHIF_READING)) {
 417                 dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_iamthif_message.\n");
 418
 419                 dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
 420
 421                 ret = mei_amthif_irq_read_message(cmpl_list, dev, mei_hdr);
 422                 if (ret)
 423                         goto end;
 424         } else {
 425                 dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_client_message.\n");
 426                 ret = mei_irq_thread_read_client_message(cmpl_list,
 427                                                          dev, mei_hdr);
 428                 if (ret)
 429                         goto end;
 430
 431         }
 432
 433         /* reset the number of slots and header */
 434         *slots = mei_count_full_read_slots(dev);
 435         dev->rd_msg_hdr = 0;
 436
 437         if (*slots == -EOVERFLOW) {
 438                 /* overflow - reset */
 439                 dev_dbg(&dev->pdev->dev, "resetting due to slots overflow.\n");
 440                 /* set the event since message has been read */
 441                 ret = -ERANGE;
 442                 goto end;
 443         }
 444 end:
 445         return ret;
 446 }
 447 EXPORT_SYMBOL_GPL(mei_irq_read_handler);
 448
 449
 450 /**
 451  * mei_irq_write_handler -  dispatch write requests
 452  *  after irq received
 453  *
 454  * @dev: the device structure
 455  * @cmpl_list: An instance of our list structure
 456  *
 457  * returns 0 on success, <0 on failure.
 458  */
 459 int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
 460 {
 461
 462         struct mei_cl *cl;
 463         struct mei_cl_cb *pos = NULL, *next = NULL;
 464         struct mei_cl_cb *list;
 465         s32 slots;
 466         int ret;
 467
 468         if (!mei_hbuf_is_ready(dev)) {
 469                 dev_dbg(&dev->pdev->dev, "host buffer is not empty.\n");
 470                 return 0;
 471         }
 472         slots = mei_hbuf_empty_slots(dev);
 473         if (slots <= 0)
 474                 return -EMSGSIZE;
 475
 476         /* complete all waiting for write CB */
 477         dev_dbg(&dev->pdev->dev, "complete all waiting for write cb.\n");
 478
 479         list = &dev->write_waiting_list;
 480         list_for_each_entry_safe(pos, next, &list->list, list) {
 481                 cl = pos->cl;
 482                 if (cl == NULL)
 483                         continue;
 484
 485                 cl->status = 0;
 486                 list_del(&pos->list);
 487                 if (MEI_WRITING == cl->writing_state &&
 488                     pos->fop_type == MEI_FOP_WRITE &&
 489                     cl != &dev->iamthif_cl) {
 490                         dev_dbg(&dev->pdev->dev, "MEI WRITE COMPLETE\n");
 491                         cl->writing_state = MEI_WRITE_COMPLETE;
 492                         list_add_tail(&pos->list, &cmpl_list->list);
 493                 }
 494                 if (cl == &dev->iamthif_cl) {
 495                         dev_dbg(&dev->pdev->dev, "check iamthif flow control.\n");
 496                         if (dev->iamthif_flow_control_pending) {
 497                                 ret = mei_amthif_irq_read(dev, &slots);
 498                                 if (ret)
 499                                         return ret;
 500                         }
 501                 }
 502         }
 503
 504         if (dev->wd_state == MEI_WD_STOPPING) {
 505                 dev->wd_state = MEI_WD_IDLE;
 506                 wake_up_interruptible(&dev->wait_stop_wd);
 507         }
 508
 509         if (dev->wr_ext_msg.hdr.length) {
 510                 mei_write_message(dev, &dev->wr_ext_msg.hdr,
 511                                 dev->wr_ext_msg.data);
 512                 slots -= mei_data2slots(dev->wr_ext_msg.hdr.length);
 513                 dev->wr_ext_msg.hdr.length = 0;
 514         }
 515         if (dev->dev_state == MEI_DEV_ENABLED) {
 516                 if (dev->wd_pending &&
 517                     mei_cl_flow_ctrl_creds(&dev->wd_cl) > 0) {
 518                         if (mei_wd_send(dev))
 519                                 dev_dbg(&dev->pdev->dev, "wd send failed.\n");
 520                         else if (mei_cl_flow_ctrl_reduce(&dev->wd_cl))
 521                                 return -ENODEV;
 522
 523                         dev->wd_pending = false;
 524
 525                         if (dev->wd_state == MEI_WD_RUNNING)
 526                                 slots -= mei_data2slots(MEI_WD_START_MSG_SIZE);
 527                         else
 528                                 slots -= mei_data2slots(MEI_WD_STOP_MSG_SIZE);
 529                 }
 530         }
 531
 532         /* complete control write list CB */
 533         dev_dbg(&dev->pdev->dev, "complete control write list cb.\n");
 534         list_for_each_entry_safe(pos, next, &dev->ctrl_wr_list.list, list) {
 535                 cl = pos->cl;
 536                 if (!cl) {
 537                         list_del(&pos->list);
 538                         return -ENODEV;
 539                 }
 540                 switch (pos->fop_type) {
 541                 case MEI_FOP_CLOSE:
 542                         /* send disconnect message */
 543                         ret = _mei_irq_thread_close(dev, &slots, pos,
 544                                                 cl, cmpl_list);
 545                         if (ret)
 546                                 return ret;
 547
 548                         break;
 549                 case MEI_FOP_READ:
 550                         /* send flow control message */
 551                         ret = _mei_irq_thread_read(dev, &slots, pos,
 552                                                 cl, cmpl_list);
 553                         if (ret)
 554                                 return ret;
 555
 556                         break;
 557                 case MEI_FOP_IOCTL:
 558                         /* connect message */
 559                         if (mei_cl_is_other_connecting(cl))
 560                                 continue;
 561                         ret = _mei_irq_thread_ioctl(dev, &slots, pos,
 562                                                 cl, cmpl_list);
 563                         if (ret)
 564                                 return ret;
 565
 566                         break;
 567
 568                 default:
 569                         BUG();
 570                 }
 571
 572         }
 573         /* complete  write list CB */
 574         dev_dbg(&dev->pdev->dev, "complete write list cb.\n");
 575         list_for_each_entry_safe(pos, next, &dev->write_list.list, list) {
 576                 cl = pos->cl;
 577                 if (cl == NULL)
 578                         continue;
 579                 if (mei_cl_flow_ctrl_creds(cl) <= 0) {
 580                         dev_dbg(&dev->pdev->dev,
 581                                 "No flow control credentials for client %d, not sending.\n",
 582                                 cl->host_client_id);
 583                         continue;
 584                 }
 585
 586                 if (cl == &dev->iamthif_cl)
 587                         ret = mei_amthif_irq_write_complete(dev, &slots,
 588                                                         pos, cmpl_list);
 589                 else
 590                         ret = mei_irq_thread_write_complete(dev, &slots, pos,
 591                                                 cmpl_list);
 592                 if (ret)
 593                         return ret;
 594
 595         }
 596         return 0;
 597 }
 598 EXPORT_SYMBOL_GPL(mei_irq_write_handler);
 599
 600
 601
 602 /**
 603  * mei_timer - timer function.
 604  *
 605  * @work: pointer to the work_struct structure
 606  *
 607  * NOTE: This function is called by timer interrupt work
 608  */
 609 void mei_timer(struct work_struct *work)
 610 {
 611         unsigned long timeout;
 612         struct mei_cl *cl_pos = NULL;
 613         struct mei_cl *cl_next = NULL;
 614         struct mei_cl_cb  *cb_pos = NULL;
 615         struct mei_cl_cb  *cb_next = NULL;
 616
 617         struct mei_device *dev = container_of(work,
 618                                         struct mei_device, timer_work.work);
 619
 620
 621         mutex_lock(&dev->device_lock);
 622         if (dev->dev_state != MEI_DEV_ENABLED) {
 623                 if (dev->dev_state == MEI_DEV_INIT_CLIENTS) {
 624                         if (dev->init_clients_timer) {
 625                                 if (--dev->init_clients_timer == 0) {
 626                                         dev_dbg(&dev->pdev->dev, "IMEI reset due to init clients timeout ,init clients state = %d.\n",
 627                                                 dev->init_clients_state);
 628                                         mei_reset(dev, 1);
 629                                 }
 630                         }
 631                 }
 632                 goto out;
 633         }
 634         /*** connect/disconnect timeouts ***/
 635         list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
 636                 if (cl_pos->timer_count) {
 637                         if (--cl_pos->timer_count == 0) {
 638                                 dev_dbg(&dev->pdev->dev, "HECI reset due to connect/disconnect timeout.\n");
 639                                 mei_reset(dev, 1);
 640                                 goto out;
 641                         }
 642                 }
 643         }
 644
 645         if (dev->iamthif_stall_timer) {
 646                 if (--dev->iamthif_stall_timer == 0) {
 647                         dev_dbg(&dev->pdev->dev, "resetting because of hang to amthi.\n");
 648                         mei_reset(dev, 1);
 649                         dev->iamthif_msg_buf_size = 0;
 650                         dev->iamthif_msg_buf_index = 0;
 651                         dev->iamthif_canceled = false;
 652                         dev->iamthif_ioctl = true;
 653                         dev->iamthif_state = MEI_IAMTHIF_IDLE;
 654                         dev->iamthif_timer = 0;
 655
 656                         mei_io_cb_free(dev->iamthif_current_cb);
 657                         dev->iamthif_current_cb = NULL;
 658
 659                         dev->iamthif_file_object = NULL;
 660                         mei_amthif_run_next_cmd(dev);
 661                 }
 662         }
 663
 664         if (dev->iamthif_timer) {
 665
 666                 timeout = dev->iamthif_timer +
 667                         mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
 668
 669                 dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
 670                                 dev->iamthif_timer);
 671                 dev_dbg(&dev->pdev->dev, "timeout = %ld\n", timeout);
 672                 dev_dbg(&dev->pdev->dev, "jiffies = %ld\n", jiffies);
 673                 if (time_after(jiffies, timeout)) {
 674                         /*
 675                          * User didn't read the AMTHI data on time (15sec)
 676                          * freeing AMTHI for other requests
 677                          */
 678
 679                         dev_dbg(&dev->pdev->dev, "freeing AMTHI for other requests\n");
 680
 681                         list_for_each_entry_safe(cb_pos, cb_next,
 682                                 &dev->amthif_rd_complete_list.list, list) {
 683
 684                                 cl_pos = cb_pos->file_object->private_data;
 685
 686                                 /* Finding the AMTHI entry. */
 687                                 if (cl_pos == &dev->iamthif_cl)
 688                                         list_del(&cb_pos->list);
 689                         }
 690                         mei_io_cb_free(dev->iamthif_current_cb);
 691                         dev->iamthif_current_cb = NULL;
 692
 693                         dev->iamthif_file_object->private_data = NULL;
 694                         dev->iamthif_file_object = NULL;
 695                         dev->iamthif_timer = 0;
 696                         mei_amthif_run_next_cmd(dev);
 697
 698                 }
 699         }
 700 out:
 701         schedule_delayed_work(&dev->timer_work, 2 * HZ);
 702         mutex_unlock(&dev->device_lock);
 703 }
 704