drivers/misc/mei/amthif.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 #include <linux/kernel.h>
  18 #include <linux/fs.h>
  19 #include <linux/errno.h>
  20 #include <linux/types.h>
  21 #include <linux/fcntl.h>
  22 #include <linux/aio.h>
  23 #include <linux/pci.h>
  24 #include <linux/init.h>
  25 #include <linux/ioctl.h>
  26 #include <linux/cdev.h>
  27 #include <linux/list.h>
  28 #include <linux/delay.h>
  29 #include <linux/sched.h>
  30 #include <linux/uuid.h>
  31 #include <linux/jiffies.h>
  32 #include <linux/uaccess.h>
  33
  34 #include <linux/mei.h>
  35
  36 #include "mei_dev.h"
  37 #include "hbm.h"
  38 #include "hw-me.h"
  39 #include "client.h"
  40
  41 const uuid_le mei_amthif_guid  = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d,
  42                                          0xac, 0xa8, 0x46, 0xe0,
  43                                          0xff, 0x65, 0x81, 0x4c);
  44
  45 /**
  46  * mei_amthif_reset_params - initializes mei device iamthif
  47  *
  48  * @dev: the device structure
  49  */
  50 void mei_amthif_reset_params(struct mei_device *dev)
  51 {
  52         /* reset iamthif parameters. */
  53         dev->iamthif_current_cb = NULL;
  54         dev->iamthif_msg_buf_size = 0;
  55         dev->iamthif_msg_buf_index = 0;
  56         dev->iamthif_canceled = false;
  57         dev->iamthif_ioctl = false;
  58         dev->iamthif_state = MEI_IAMTHIF_IDLE;
  59         dev->iamthif_timer = 0;
  60         dev->iamthif_stall_timer = 0;
  61         dev->iamthif_open_count = 0;
  62 }
  63
  64 /**
  65  * mei_amthif_host_init - mei initialization amthif client.
  66  *
  67  * @dev: the device structure
  68  *
  69  */
  70 int mei_amthif_host_init(struct mei_device *dev)
  71 {
  72         struct mei_cl *cl = &dev->iamthif_cl;
  73         unsigned char *msg_buf;
  74         int ret, i;
  75
  76         dev->iamthif_state = MEI_IAMTHIF_IDLE;
  77
  78         mei_cl_init(cl, dev);
  79
  80         i = mei_me_cl_by_uuid(dev, &mei_amthif_guid);
  81         if (i < 0) {
  82                 ret = i;
  83                 dev_info(&dev->pdev->dev,
  84                         "amthif: failed to find the client %d\n", ret);
  85                 return ret;
  86         }
  87
  88         cl->me_client_id = dev->me_clients[i].client_id;
  89
  90         /* Assign iamthif_mtu to the value received from ME  */
  91
  92         dev->iamthif_mtu = dev->me_clients[i].props.max_msg_length;
  93         dev_dbg(&dev->pdev->dev, "IAMTHIF_MTU = %d\n",
  94                         dev->me_clients[i].props.max_msg_length);
  95
  96         kfree(dev->iamthif_msg_buf);
  97         dev->iamthif_msg_buf = NULL;
  98
  99         /* allocate storage for ME message buffer */
 100         msg_buf = kcalloc(dev->iamthif_mtu,
 101                         sizeof(unsigned char), GFP_KERNEL);
 102         if (!msg_buf) {
 103                 dev_err(&dev->pdev->dev, "amthif: memory allocation for ME message buffer failed.\n");
 104                 return -ENOMEM;
 105         }
 106
 107         dev->iamthif_msg_buf = msg_buf;
 108
 109         ret = mei_cl_link(cl, MEI_IAMTHIF_HOST_CLIENT_ID);
 110
 111         if (ret < 0) {
 112                 dev_err(&dev->pdev->dev,
 113                         "amthif: failed link client %d\n", ret);
 114                 return ret;
 115         }
 116
 117         cl->state = MEI_FILE_CONNECTING;
 118
 119         if (mei_hbm_cl_connect_req(dev, cl)) {
 120                 dev_dbg(&dev->pdev->dev, "amthif: Failed to connect to ME client\n");
 121                 cl->state = MEI_FILE_DISCONNECTED;
 122                 cl->host_client_id = 0;
 123         } else {
 124                 cl->timer_count = MEI_CONNECT_TIMEOUT;
 125         }
 126         return 0;
 127 }
 128
 129 /**
 130  * mei_amthif_find_read_list_entry - finds a amthilist entry for current file
 131  *
 132  * @dev: the device structure
 133  * @file: pointer to file object
 134  *
 135  * returns   returned a list entry on success, NULL on failure.
 136  */
 137 struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
 138                                                 struct file *file)
 139 {
 140         struct mei_cl_cb *pos = NULL;
 141         struct mei_cl_cb *next = NULL;
 142
 143         list_for_each_entry_safe(pos, next,
 144                                 &dev->amthif_rd_complete_list.list, list) {
 145                 if (pos->cl && pos->cl == &dev->iamthif_cl &&
 146                         pos->file_object == file)
 147                         return pos;
 148         }
 149         return NULL;
 150 }
 151
 152
 153 /**
 154  * mei_amthif_read - read data from AMTHIF client
 155  *
 156  * @dev: the device structure
 157  * @if_num:  minor number
 158  * @file: pointer to file object
 159  * @*ubuf: pointer to user data in user space
 160  * @length: data length to read
 161  * @offset: data read offset
 162  *
 163  * Locking: called under "dev->device_lock" lock
 164  *
 165  * returns
 166  *  returned data length on success,
 167  *  zero if no data to read,
 168  *  negative on failure.
 169  */
 170 int mei_amthif_read(struct mei_device *dev, struct file *file,
 171                char __user *ubuf, size_t length, loff_t *offset)
 172 {
 173         int rets;
 174         int wait_ret;
 175         struct mei_cl_cb *cb = NULL;
 176         struct mei_cl *cl = file->private_data;
 177         unsigned long timeout;
 178         int i;
 179
 180         /* Only Posible if we are in timeout */
 181         if (!cl || cl != &dev->iamthif_cl) {
 182                 dev_dbg(&dev->pdev->dev, "bad file ext.\n");
 183                 return -ETIMEDOUT;
 184         }
 185
 186         i = mei_me_cl_by_id(dev, dev->iamthif_cl.me_client_id);
 187
 188         if (i < 0) {
 189                 dev_dbg(&dev->pdev->dev, "amthif client not found.\n");
 190                 return -ENODEV;
 191         }
 192         dev_dbg(&dev->pdev->dev, "checking amthif data\n");
 193         cb = mei_amthif_find_read_list_entry(dev, file);
 194
 195         /* Check for if we can block or not*/
 196         if (cb == NULL && file->f_flags & O_NONBLOCK)
 197                 return -EAGAIN;
 198
 199
 200         dev_dbg(&dev->pdev->dev, "waiting for amthif data\n");
 201         while (cb == NULL) {
 202                 /* unlock the Mutex */
 203                 mutex_unlock(&dev->device_lock);
 204
 205                 wait_ret = wait_event_interruptible(dev->iamthif_cl.wait,
 206                         (cb = mei_amthif_find_read_list_entry(dev, file)));
 207
 208                 /* Locking again the Mutex */
 209                 mutex_lock(&dev->device_lock);
 210
 211                 if (wait_ret)
 212                         return -ERESTARTSYS;
 213
 214                 dev_dbg(&dev->pdev->dev, "woke up from sleep\n");
 215         }
 216
 217
 218         dev_dbg(&dev->pdev->dev, "Got amthif data\n");
 219         dev->iamthif_timer = 0;
 220
 221         if (cb) {
 222                 timeout = cb->read_time +
 223                         mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
 224                 dev_dbg(&dev->pdev->dev, "amthif timeout = %lud\n",
 225                                 timeout);
 226
 227                 if  (time_after(jiffies, timeout)) {
 228                         dev_dbg(&dev->pdev->dev, "amthif Time out\n");
 229                         /* 15 sec for the message has expired */
 230                         list_del(&cb->list);
 231                         rets = -ETIMEDOUT;
 232                         goto free;
 233                 }
 234         }
 235         /* if the whole message will fit remove it from the list */
 236         if (cb->buf_idx >= *offset && length >= (cb->buf_idx - *offset))
 237                 list_del(&cb->list);
 238         else if (cb->buf_idx > 0 && cb->buf_idx <= *offset) {
 239                 /* end of the message has been reached */
 240                 list_del(&cb->list);
 241                 rets = 0;
 242                 goto free;
 243         }
 244                 /* else means that not full buffer will be read and do not
 245                  * remove message from deletion list
 246                  */
 247
 248         dev_dbg(&dev->pdev->dev, "amthif cb->response_buffer size - %d\n",
 249             cb->response_buffer.size);
 250         dev_dbg(&dev->pdev->dev, "amthif cb->buf_idx - %lu\n", cb->buf_idx);
 251
 252         /* length is being turncated to PAGE_SIZE, however,
 253          * the buf_idx may point beyond */
 254         length = min_t(size_t, length, (cb->buf_idx - *offset));
 255
 256         if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length))
 257                 rets = -EFAULT;
 258         else {
 259                 rets = length;
 260                 if ((*offset + length) < cb->buf_idx) {
 261                         *offset += length;
 262                         goto out;
 263                 }
 264         }
 265 free:
 266         dev_dbg(&dev->pdev->dev, "free amthif cb memory.\n");
 267         *offset = 0;
 268         mei_io_cb_free(cb);
 269 out:
 270         return rets;
 271 }
 272
 273 /**
 274  * mei_amthif_send_cmd - send amthif command to the ME
 275  *
 276  * @dev: the device structure
 277  * @cb: mei call back struct
 278  *
 279  * returns 0 on success, <0 on failure.
 280  *
 281  */
 282 static int mei_amthif_send_cmd(struct mei_device *dev, struct mei_cl_cb *cb)
 283 {
 284         struct mei_msg_hdr mei_hdr;
 285         int ret;
 286
 287         if (!dev || !cb)
 288                 return -ENODEV;
 289
 290         dev_dbg(&dev->pdev->dev, "write data to amthif client.\n");
 291
 292         dev->iamthif_state = MEI_IAMTHIF_WRITING;
 293         dev->iamthif_current_cb = cb;
 294         dev->iamthif_file_object = cb->file_object;
 295         dev->iamthif_canceled = false;
 296         dev->iamthif_ioctl = true;
 297         dev->iamthif_msg_buf_size = cb->request_buffer.size;
 298         memcpy(dev->iamthif_msg_buf, cb->request_buffer.data,
 299                cb->request_buffer.size);
 300
 301         ret = mei_cl_flow_ctrl_creds(&dev->iamthif_cl);
 302         if (ret < 0)
 303                 return ret;
 304
 305         if (ret && dev->hbuf_is_ready) {
 306                 ret = 0;
 307                 dev->hbuf_is_ready = false;
 308                 if (cb->request_buffer.size > mei_hbuf_max_len(dev)) {
 309                         mei_hdr.length = mei_hbuf_max_len(dev);
 310                         mei_hdr.msg_complete = 0;
 311                 } else {
 312                         mei_hdr.length = cb->request_buffer.size;
 313                         mei_hdr.msg_complete = 1;
 314                 }
 315
 316                 mei_hdr.host_addr = dev->iamthif_cl.host_client_id;
 317                 mei_hdr.me_addr = dev->iamthif_cl.me_client_id;
 318                 mei_hdr.reserved = 0;
 319                 dev->iamthif_msg_buf_index += mei_hdr.length;
 320                 ret = mei_write_message(dev, &mei_hdr, dev->iamthif_msg_buf);
 321                 if (ret)
 322                         return ret;
 323
 324                 if (mei_hdr.msg_complete) {
 325                         if (mei_cl_flow_ctrl_reduce(&dev->iamthif_cl))
 326                                 return -EIO;
 327                         dev->iamthif_flow_control_pending = true;
 328                         dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
 329                         dev_dbg(&dev->pdev->dev, "add amthif cb to write waiting list\n");
 330                         dev->iamthif_current_cb = cb;
 331                         dev->iamthif_file_object = cb->file_object;
 332                         list_add_tail(&cb->list, &dev->write_waiting_list.list);
 333                 } else {
 334                         dev_dbg(&dev->pdev->dev, "message does not complete, so add amthif cb to write list.\n");
 335                         list_add_tail(&cb->list, &dev->write_list.list);
 336                 }
 337         } else {
 338                 if (!dev->hbuf_is_ready)
 339                         dev_dbg(&dev->pdev->dev, "host buffer is not empty");
 340
 341                 dev_dbg(&dev->pdev->dev, "No flow control credentials, so add iamthif cb to write list.\n");
 342                 list_add_tail(&cb->list, &dev->write_list.list);
 343         }
 344         return 0;
 345 }
 346
 347 /**
 348  * mei_amthif_write - write amthif data to amthif client
 349  *
 350  * @dev: the device structure
 351  * @cb: mei call back struct
 352  *
 353  * returns 0 on success, <0 on failure.
 354  *
 355  */
 356 int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *cb)
 357 {
 358         int ret;
 359
 360         if (!dev || !cb)
 361                 return -ENODEV;
 362
 363         ret = mei_io_cb_alloc_resp_buf(cb, dev->iamthif_mtu);
 364         if (ret)
 365                 return ret;
 366
 367         cb->fop_type = MEI_FOP_IOCTL;
 368
 369         if (!list_empty(&dev->amthif_cmd_list.list) ||
 370             dev->iamthif_state != MEI_IAMTHIF_IDLE) {
 371                 dev_dbg(&dev->pdev->dev,
 372                         "amthif state = %d\n", dev->iamthif_state);
 373                 dev_dbg(&dev->pdev->dev, "AMTHIF: add cb to the wait list\n");
 374                 list_add_tail(&cb->list, &dev->amthif_cmd_list.list);
 375                 return 0;
 376         }
 377         return mei_amthif_send_cmd(dev, cb);
 378 }
 379 /**
 380  * mei_amthif_run_next_cmd
 381  *
 382  * @dev: the device structure
 383  *
 384  * returns 0 on success, <0 on failure.
 385  */
 386 void mei_amthif_run_next_cmd(struct mei_device *dev)
 387 {
 388         struct mei_cl_cb *pos = NULL;
 389         struct mei_cl_cb *next = NULL;
 390         int status;
 391
 392         if (!dev)
 393                 return;
 394
 395         dev->iamthif_msg_buf_size = 0;
 396         dev->iamthif_msg_buf_index = 0;
 397         dev->iamthif_canceled = false;
 398         dev->iamthif_ioctl = true;
 399         dev->iamthif_state = MEI_IAMTHIF_IDLE;
 400         dev->iamthif_timer = 0;
 401         dev->iamthif_file_object = NULL;
 402
 403         dev_dbg(&dev->pdev->dev, "complete amthif cmd_list cb.\n");
 404
 405         list_for_each_entry_safe(pos, next, &dev->amthif_cmd_list.list, list) {
 406                 list_del(&pos->list);
 407
 408                 if (pos->cl && pos->cl == &dev->iamthif_cl) {
 409                         status = mei_amthif_send_cmd(dev, pos);
 410                         if (status) {
 411                                 dev_dbg(&dev->pdev->dev,
 412                                         "amthif write failed status = %d\n",
 413                                                 status);
 414                                 return;
 415                         }
 416                         break;
 417                 }
 418         }
 419 }
 420
 421
 422 unsigned int mei_amthif_poll(struct mei_device *dev,
 423                 struct file *file, poll_table *wait)
 424 {
 425         unsigned int mask = 0;
 426
 427         poll_wait(file, &dev->iamthif_cl.wait, wait);
 428
 429         mutex_lock(&dev->device_lock);
 430         if (!mei_cl_is_connected(&dev->iamthif_cl)) {
 431
 432                 mask = POLLERR;
 433
 434         } else if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&
 435                    dev->iamthif_file_object == file) {
 436
 437                 mask |= (POLLIN | POLLRDNORM);
 438                 dev_dbg(&dev->pdev->dev, "run next amthif cb\n");
 439                 mei_amthif_run_next_cmd(dev);
 440         }
 441         mutex_unlock(&dev->device_lock);
 442
 443         return mask;
 444 }
 445
 446
 447
 448 /**
 449  * mei_amthif_irq_write_completed - processes completed iamthif operation.
 450  *
 451  * @dev: the device structure.
 452  * @slots: free slots.
 453  * @cb_pos: callback block.
 454  * @cl: private data of the file object.
 455  * @cmpl_list: complete list.
 456  *
 457  * returns 0, OK; otherwise, error.
 458  */
 459 int mei_amthif_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
 460                                   s32 *slots, struct mei_cl_cb *cmpl_list)
 461 {
 462         struct mei_device *dev = cl->dev;
 463         struct mei_msg_hdr mei_hdr;
 464         size_t len = dev->iamthif_msg_buf_size - dev->iamthif_msg_buf_index;
 465         u32 msg_slots = mei_data2slots(len);
 466         int rets;
 467
 468         rets = mei_cl_flow_ctrl_creds(cl);
 469         if (rets < 0)
 470                 return rets;
 471
 472         if (rets == 0) {
 473                 cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
 474                 return 0;
 475         }
 476
 477         mei_hdr.host_addr = cl->host_client_id;
 478         mei_hdr.me_addr = cl->me_client_id;
 479         mei_hdr.reserved = 0;
 480
 481         if (*slots >= msg_slots) {
 482                 mei_hdr.length = len;
 483                 mei_hdr.msg_complete = 1;
 484         /* Split the message only if we can write the whole host buffer */
 485         } else if (*slots == dev->hbuf_depth) {
 486                 msg_slots = *slots;
 487                 len = (*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
 488                 mei_hdr.length = len;
 489                 mei_hdr.msg_complete = 0;
 490         } else {
 491                 /* wait for next time the host buffer is empty */
 492                 return 0;
 493         }
 494
 495         dev_dbg(&dev->pdev->dev, MEI_HDR_FMT,  MEI_HDR_PRM(&mei_hdr));
 496
 497         *slots -=  msg_slots;
 498         rets = mei_write_message(dev, &mei_hdr,
 499                         dev->iamthif_msg_buf + dev->iamthif_msg_buf_index);
 500         if (rets) {
 501                 dev->iamthif_state = MEI_IAMTHIF_IDLE;
 502                 cl->status = rets;
 503                 list_del(&cb->list);
 504                 return rets;
 505         }
 506
 507         if (mei_cl_flow_ctrl_reduce(cl))
 508                 return -EIO;
 509
 510         dev->iamthif_msg_buf_index += mei_hdr.length;
 511         cl->status = 0;
 512
 513         if (mei_hdr.msg_complete) {
 514                 dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
 515                 dev->iamthif_flow_control_pending = true;
 516
 517                 /* save iamthif cb sent to amthif client */
 518                 cb->buf_idx = dev->iamthif_msg_buf_index;
 519                 dev->iamthif_current_cb = cb;
 520
 521                 list_move_tail(&cb->list, &dev->write_waiting_list.list);
 522         }
 523
 524
 525         return 0;
 526 }
 527
 528 /**
 529  * mei_amthif_irq_read_message - read routine after ISR to
 530  *                      handle the read amthif message
 531  *
 532  * @dev: the device structure
 533  * @mei_hdr: header of amthif message
 534  * @complete_list: An instance of our list structure
 535  *
 536  * returns 0 on success, <0 on failure.
 537  */
 538 int mei_amthif_irq_read_msg(struct mei_device *dev,
 539                             struct mei_msg_hdr *mei_hdr,
 540                             struct mei_cl_cb *complete_list)
 541 {
 542         struct mei_cl_cb *cb;
 543         unsigned char *buffer;
 544
 545         BUG_ON(mei_hdr->me_addr != dev->iamthif_cl.me_client_id);
 546         BUG_ON(dev->iamthif_state != MEI_IAMTHIF_READING);
 547
 548         buffer = dev->iamthif_msg_buf + dev->iamthif_msg_buf_index;
 549         BUG_ON(dev->iamthif_mtu < dev->iamthif_msg_buf_index + mei_hdr->length);
 550
 551         mei_read_slots(dev, buffer, mei_hdr->length);
 552
 553         dev->iamthif_msg_buf_index += mei_hdr->length;
 554
 555         if (!mei_hdr->msg_complete)
 556                 return 0;
 557
 558         dev_dbg(&dev->pdev->dev, "amthif_message_buffer_index =%d\n",
 559                         mei_hdr->length);
 560
 561         dev_dbg(&dev->pdev->dev, "completed amthif read.\n ");
 562         if (!dev->iamthif_current_cb)
 563                 return -ENODEV;
 564
 565         cb = dev->iamthif_current_cb;
 566         dev->iamthif_current_cb = NULL;
 567
 568         if (!cb->cl)
 569                 return -ENODEV;
 570
 571         dev->iamthif_stall_timer = 0;
 572         cb->buf_idx = dev->iamthif_msg_buf_index;
 573         cb->read_time = jiffies;
 574         if (dev->iamthif_ioctl && cb->cl == &dev->iamthif_cl) {
 575                 /* found the iamthif cb */
 576                 dev_dbg(&dev->pdev->dev, "complete the amthif read cb.\n ");
 577                 dev_dbg(&dev->pdev->dev, "add the amthif read cb to complete.\n ");
 578                 list_add_tail(&cb->list, &complete_list->list);
 579         }
 580         return 0;
 581 }
 582
 583 /**
 584  * mei_amthif_irq_read - prepares to read amthif data.
 585  *
 586  * @dev: the device structure.
 587  * @slots: free slots.
 588  *
 589  * returns 0, OK; otherwise, error.
 590  */
 591 int mei_amthif_irq_read(struct mei_device *dev, s32 *slots)
 592 {
 593         u32 msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));
 594
 595         if (*slots < msg_slots)
 596                 return -EMSGSIZE;
 597
 598         *slots -= msg_slots;
 599
 600         if (mei_hbm_cl_flow_control_req(dev, &dev->iamthif_cl)) {
 601                 dev_dbg(&dev->pdev->dev, "iamthif flow control failed\n");
 602                 return -EIO;
 603         }
 604
 605         dev_dbg(&dev->pdev->dev, "iamthif flow control success\n");
 606         dev->iamthif_state = MEI_IAMTHIF_READING;
 607         dev->iamthif_flow_control_pending = false;
 608         dev->iamthif_msg_buf_index = 0;
 609         dev->iamthif_msg_buf_size = 0;
 610         dev->iamthif_stall_timer = MEI_IAMTHIF_STALL_TIMER;
 611         dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
 612         return 0;
 613 }
 614
 615 /**
 616  * mei_amthif_complete - complete amthif callback.
 617  *
 618  * @dev: the device structure.
 619  * @cb_pos: callback block.
 620  */
 621 void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb)
 622 {
 623         if (dev->iamthif_canceled != 1) {
 624                 dev->iamthif_state = MEI_IAMTHIF_READ_COMPLETE;
 625                 dev->iamthif_stall_timer = 0;
 626                 memcpy(cb->response_buffer.data,
 627                                 dev->iamthif_msg_buf,
 628                                 dev->iamthif_msg_buf_index);
 629                 list_add_tail(&cb->list, &dev->amthif_rd_complete_list.list);
 630                 dev_dbg(&dev->pdev->dev, "amthif read completed\n");
 631                 dev->iamthif_timer = jiffies;
 632                 dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
 633                                 dev->iamthif_timer);
 634         } else {
 635                 mei_amthif_run_next_cmd(dev);
 636         }
 637
 638         dev_dbg(&dev->pdev->dev, "completing amthif call back.\n");
 639         wake_up_interruptible(&dev->iamthif_cl.wait);
 640 }
 641
 642 /**
 643  * mei_clear_list - removes all callbacks associated with file
 644  *              from mei_cb_list
 645  *
 646  * @dev: device structure.
 647  * @file: file structure
 648  * @mei_cb_list: callbacks list
 649  *
 650  * mei_clear_list is called to clear resources associated with file
 651  * when application calls close function or Ctrl-C was pressed
 652  *
 653  * returns true if callback removed from the list, false otherwise
 654  */
 655 static bool mei_clear_list(struct mei_device *dev,
 656                 const struct file *file, struct list_head *mei_cb_list)
 657 {
 658         struct mei_cl_cb *cb_pos = NULL;
 659         struct mei_cl_cb *cb_next = NULL;
 660         bool removed = false;
 661
 662         /* list all list member */
 663         list_for_each_entry_safe(cb_pos, cb_next, mei_cb_list, list) {
 664                 /* check if list member associated with a file */
 665                 if (file == cb_pos->file_object) {
 666                         /* remove member from the list */
 667                         list_del(&cb_pos->list);
 668                         /* check if cb equal to current iamthif cb */
 669                         if (dev->iamthif_current_cb == cb_pos) {
 670                                 dev->iamthif_current_cb = NULL;
 671                                 /* send flow control to iamthif client */
 672                                 mei_hbm_cl_flow_control_req(dev,
 673                                                         &dev->iamthif_cl);
 674                         }
 675                         /* free all allocated buffers */
 676                         mei_io_cb_free(cb_pos);
 677                         cb_pos = NULL;
 678                         removed = true;
 679                 }
 680         }
 681         return removed;
 682 }
 683
 684 /**
 685  * mei_clear_lists - removes all callbacks associated with file
 686  *
 687  * @dev: device structure
 688  * @file: file structure
 689  *
 690  * mei_clear_lists is called to clear resources associated with file
 691  * when application calls close function or Ctrl-C was pressed
 692  *
 693  * returns true if callback removed from the list, false otherwise
 694  */
 695 static bool mei_clear_lists(struct mei_device *dev, struct file *file)
 696 {
 697         bool removed = false;
 698
 699         /* remove callbacks associated with a file */
 700         mei_clear_list(dev, file, &dev->amthif_cmd_list.list);
 701         if (mei_clear_list(dev, file, &dev->amthif_rd_complete_list.list))
 702                 removed = true;
 703
 704         mei_clear_list(dev, file, &dev->ctrl_rd_list.list);
 705
 706         if (mei_clear_list(dev, file, &dev->ctrl_wr_list.list))
 707                 removed = true;
 708
 709         if (mei_clear_list(dev, file, &dev->write_waiting_list.list))
 710                 removed = true;
 711
 712         if (mei_clear_list(dev, file, &dev->write_list.list))
 713                 removed = true;
 714
 715         /* check if iamthif_current_cb not NULL */
 716         if (dev->iamthif_current_cb && !removed) {
 717                 /* check file and iamthif current cb association */
 718                 if (dev->iamthif_current_cb->file_object == file) {
 719                         /* remove cb */
 720                         mei_io_cb_free(dev->iamthif_current_cb);
 721                         dev->iamthif_current_cb = NULL;
 722                         removed = true;
 723                 }
 724         }
 725         return removed;
 726 }
 727
 728 /**
 729 * mei_amthif_release - the release function
 730 *
 731 *  @dev: device structure
 732 *  @file: pointer to file structure
 733 *
 734 *  returns 0 on success, <0 on error
 735 */
 736 int mei_amthif_release(struct mei_device *dev, struct file *file)
 737 {
 738         if (dev->iamthif_open_count > 0)
 739                 dev->iamthif_open_count--;
 740
 741         if (dev->iamthif_file_object == file &&
 742             dev->iamthif_state != MEI_IAMTHIF_IDLE) {
 743
 744                 dev_dbg(&dev->pdev->dev, "amthif canceled iamthif state %d\n",
 745                     dev->iamthif_state);
 746                 dev->iamthif_canceled = true;
 747                 if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE) {
 748                         dev_dbg(&dev->pdev->dev, "run next amthif iamthif cb\n");
 749                         mei_amthif_run_next_cmd(dev);
 750                 }
 751         }
 752
 753         if (mei_clear_lists(dev, file))
 754                 dev->iamthif_state = MEI_IAMTHIF_IDLE;
 755
 756         return 0;
 757 }