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