drivers/misc/mei/init.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/pci.h>
  18 #include <linux/sched.h>
  19 #include <linux/wait.h>
  20 #include <linux/delay.h>
  21
  22 #include "mei_dev.h"
  23 #include "hw.h"
  24 #include "interface.h"
  25 #include <linux/mei.h>
  26
  27 const uuid_le mei_amthi_guid  = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d, 0xac,
  28                                                 0xa8, 0x46, 0xe0, 0xff, 0x65,
  29                                                 0x81, 0x4c);
  30
  31 /**
  32  * mei_io_list_init - Sets up a queue list.
  33  *
  34  * @list: An instance io list structure
  35  * @dev: the device structure
  36  */
  37 void mei_io_list_init(struct mei_io_list *list)
  38 {
  39         /* initialize our queue list */
  40         INIT_LIST_HEAD(&list->mei_cb.cb_list);
  41 }
  42
  43 /**
  44  * mei_io_list_flush - removes list entry belonging to cl.
  45  *
  46  * @list:  An instance of our list structure
  47  * @cl: private data of the file object
  48  */
  49 void mei_io_list_flush(struct mei_io_list *list, struct mei_cl *cl)
  50 {
  51         struct mei_cl_cb *pos;
  52         struct mei_cl_cb *next;
  53
  54         list_for_each_entry_safe(pos, next, &list->mei_cb.cb_list, cb_list) {
  55                 if (pos->file_private) {
  56                         struct mei_cl *cl_tmp;
  57                         cl_tmp = (struct mei_cl *)pos->file_private;
  58                         if (mei_cl_cmp_id(cl, cl_tmp))
  59                                 list_del(&pos->cb_list);
  60                 }
  61         }
  62 }
  63 /**
  64  * mei_cl_flush_queues - flushes queue lists belonging to cl.
  65  *
  66  * @dev: the device structure
  67  * @cl: private data of the file object
  68  */
  69 int mei_cl_flush_queues(struct mei_cl *cl)
  70 {
  71         if (!cl || !cl->dev)
  72                 return -EINVAL;
  73
  74         dev_dbg(&cl->dev->pdev->dev, "remove list entry belonging to cl\n");
  75         mei_io_list_flush(&cl->dev->read_list, cl);
  76         mei_io_list_flush(&cl->dev->write_list, cl);
  77         mei_io_list_flush(&cl->dev->write_waiting_list, cl);
  78         mei_io_list_flush(&cl->dev->ctrl_wr_list, cl);
  79         mei_io_list_flush(&cl->dev->ctrl_rd_list, cl);
  80         mei_io_list_flush(&cl->dev->amthi_cmd_list, cl);
  81         mei_io_list_flush(&cl->dev->amthi_read_complete_list, cl);
  82         return 0;
  83 }
  84
  85
  86
  87 /**
  88  * mei_reset_iamthif_params - initializes mei device iamthif
  89  *
  90  * @dev: the device structure
  91  */
  92 static void mei_reset_iamthif_params(struct mei_device *dev)
  93 {
  94         /* reset iamthif parameters. */
  95         dev->iamthif_current_cb = NULL;
  96         dev->iamthif_msg_buf_size = 0;
  97         dev->iamthif_msg_buf_index = 0;
  98         dev->iamthif_canceled = false;
  99         dev->iamthif_ioctl = false;
 100         dev->iamthif_state = MEI_IAMTHIF_IDLE;
 101         dev->iamthif_timer = 0;
 102 }
 103
 104 /**
 105  * init_mei_device - allocates and initializes the mei device structure
 106  *
 107  * @pdev: The pci device structure
 108  *
 109  * returns The mei_device_device pointer on success, NULL on failure.
 110  */
 111 struct mei_device *mei_device_init(struct pci_dev *pdev)
 112 {
 113         struct mei_device *dev;
 114
 115         dev = kzalloc(sizeof(struct mei_device), GFP_KERNEL);
 116         if (!dev)
 117                 return NULL;
 118
 119         /* setup our list array */
 120         INIT_LIST_HEAD(&dev->file_list);
 121         INIT_LIST_HEAD(&dev->wd_cl.link);
 122         INIT_LIST_HEAD(&dev->iamthif_cl.link);
 123         mutex_init(&dev->device_lock);
 124         init_waitqueue_head(&dev->wait_recvd_msg);
 125         init_waitqueue_head(&dev->wait_stop_wd);
 126         dev->mei_state = MEI_INITIALIZING;
 127         dev->iamthif_state = MEI_IAMTHIF_IDLE;
 128         dev->wd_interface_reg = false;
 129
 130
 131         mei_io_list_init(&dev->read_list);
 132         mei_io_list_init(&dev->write_list);
 133         mei_io_list_init(&dev->write_waiting_list);
 134         mei_io_list_init(&dev->ctrl_wr_list);
 135         mei_io_list_init(&dev->ctrl_rd_list);
 136         mei_io_list_init(&dev->amthi_cmd_list);
 137         mei_io_list_init(&dev->amthi_read_complete_list);
 138         dev->pdev = pdev;
 139         return dev;
 140 }
 141
 142 /**
 143  * mei_hw_init - initializes host and fw to start work.
 144  *
 145  * @dev: the device structure
 146  *
 147  * returns 0 on success, <0 on failure.
 148  */
 149 int mei_hw_init(struct mei_device *dev)
 150 {
 151         int err = 0;
 152         int ret;
 153
 154         mutex_lock(&dev->device_lock);
 155
 156         dev->host_hw_state = mei_hcsr_read(dev);
 157         dev->me_hw_state = mei_mecsr_read(dev);
 158         dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, mestate = 0x%08x.\n",
 159             dev->host_hw_state, dev->me_hw_state);
 160
 161         /* acknowledge interrupt and stop interupts */
 162         if ((dev->host_hw_state & H_IS) == H_IS)
 163                 mei_reg_write(dev, H_CSR, dev->host_hw_state);
 164
 165         /* Doesn't change in runtime */
 166         dev->hbuf_depth = (dev->host_hw_state & H_CBD) >> 24;
 167
 168         dev->recvd_msg = false;
 169         dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
 170
 171         mei_reset(dev, 1);
 172
 173         dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
 174             dev->host_hw_state, dev->me_hw_state);
 175
 176         /* wait for ME to turn on ME_RDY */
 177         if (!dev->recvd_msg) {
 178                 mutex_unlock(&dev->device_lock);
 179                 err = wait_event_interruptible_timeout(dev->wait_recvd_msg,
 180                         dev->recvd_msg, MEI_INTEROP_TIMEOUT);
 181                 mutex_lock(&dev->device_lock);
 182         }
 183
 184         if (err <= 0 && !dev->recvd_msg) {
 185                 dev->mei_state = MEI_DISABLED;
 186                 dev_dbg(&dev->pdev->dev,
 187                         "wait_event_interruptible_timeout failed"
 188                         "on wait for ME to turn on ME_RDY.\n");
 189                 ret = -ENODEV;
 190                 goto out;
 191         }
 192
 193         if (!(((dev->host_hw_state & H_RDY) == H_RDY) &&
 194               ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA))) {
 195                 dev->mei_state = MEI_DISABLED;
 196                 dev_dbg(&dev->pdev->dev,
 197                         "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
 198                         dev->host_hw_state, dev->me_hw_state);
 199
 200                 if (!(dev->host_hw_state & H_RDY))
 201                         dev_dbg(&dev->pdev->dev, "host turn off H_RDY.\n");
 202
 203                 if (!(dev->me_hw_state & ME_RDY_HRA))
 204                         dev_dbg(&dev->pdev->dev, "ME turn off ME_RDY.\n");
 205
 206                 dev_err(&dev->pdev->dev, "link layer initialization failed.\n");
 207                 ret = -ENODEV;
 208                 goto out;
 209         }
 210
 211         if (dev->version.major_version != HBM_MAJOR_VERSION ||
 212             dev->version.minor_version != HBM_MINOR_VERSION) {
 213                 dev_dbg(&dev->pdev->dev, "MEI start failed.\n");
 214                 ret = -ENODEV;
 215                 goto out;
 216         }
 217
 218         dev->recvd_msg = false;
 219         dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
 220             dev->host_hw_state, dev->me_hw_state);
 221         dev_dbg(&dev->pdev->dev, "ME turn on ME_RDY and host turn on H_RDY.\n");
 222         dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
 223         dev_dbg(&dev->pdev->dev, "MEI  start success.\n");
 224         ret = 0;
 225
 226 out:
 227         mutex_unlock(&dev->device_lock);
 228         return ret;
 229 }
 230
 231 /**
 232  * mei_hw_reset - resets fw via mei csr register.
 233  *
 234  * @dev: the device structure
 235  * @interrupts_enabled: if interrupt should be enabled after reset.
 236  */
 237 static void mei_hw_reset(struct mei_device *dev, int interrupts_enabled)
 238 {
 239         dev->host_hw_state |= (H_RST | H_IG);
 240
 241         if (interrupts_enabled)
 242                 mei_enable_interrupts(dev);
 243         else
 244                 mei_disable_interrupts(dev);
 245 }
 246
 247 /**
 248  * mei_reset - resets host and fw.
 249  *
 250  * @dev: the device structure
 251  * @interrupts_enabled: if interrupt should be enabled after reset.
 252  */
 253 void mei_reset(struct mei_device *dev, int interrupts_enabled)
 254 {
 255         struct mei_cl *cl_pos = NULL;
 256         struct mei_cl *cl_next = NULL;
 257         struct mei_cl_cb *cb_pos = NULL;
 258         struct mei_cl_cb *cb_next = NULL;
 259         bool unexpected;
 260
 261         if (dev->mei_state == MEI_RECOVERING_FROM_RESET) {
 262                 dev->need_reset = true;
 263                 return;
 264         }
 265
 266         unexpected = (dev->mei_state != MEI_INITIALIZING &&
 267                         dev->mei_state != MEI_DISABLED &&
 268                         dev->mei_state != MEI_POWER_DOWN &&
 269                         dev->mei_state != MEI_POWER_UP);
 270
 271         dev->host_hw_state = mei_hcsr_read(dev);
 272
 273         dev_dbg(&dev->pdev->dev, "before reset host_hw_state = 0x%08x.\n",
 274             dev->host_hw_state);
 275
 276         mei_hw_reset(dev, interrupts_enabled);
 277
 278         dev->host_hw_state &= ~H_RST;
 279         dev->host_hw_state |= H_IG;
 280
 281         mei_hcsr_set(dev);
 282
 283         dev_dbg(&dev->pdev->dev, "currently saved host_hw_state = 0x%08x.\n",
 284             dev->host_hw_state);
 285
 286         dev->need_reset = false;
 287
 288         if (dev->mei_state != MEI_INITIALIZING) {
 289                 if (dev->mei_state != MEI_DISABLED &&
 290                     dev->mei_state != MEI_POWER_DOWN)
 291                         dev->mei_state = MEI_RESETING;
 292
 293                 list_for_each_entry_safe(cl_pos,
 294                                 cl_next, &dev->file_list, link) {
 295                         cl_pos->state = MEI_FILE_DISCONNECTED;
 296                         cl_pos->mei_flow_ctrl_creds = 0;
 297                         cl_pos->read_cb = NULL;
 298                         cl_pos->timer_count = 0;
 299                 }
 300                 /* remove entry if already in list */
 301                 dev_dbg(&dev->pdev->dev, "list del iamthif and wd file list.\n");
 302                 mei_remove_client_from_file_list(dev,
 303                                 dev->wd_cl.host_client_id);
 304
 305                 mei_remove_client_from_file_list(dev,
 306                                 dev->iamthif_cl.host_client_id);
 307
 308                 mei_reset_iamthif_params(dev);
 309                 dev->extra_write_index = 0;
 310         }
 311
 312         dev->me_clients_num = 0;
 313         dev->rd_msg_hdr = 0;
 314         dev->stop = false;
 315         dev->wd_pending = false;
 316
 317         /* update the state of the registers after reset */
 318         dev->host_hw_state = mei_hcsr_read(dev);
 319         dev->me_hw_state = mei_mecsr_read(dev);
 320
 321         dev_dbg(&dev->pdev->dev, "after reset host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
 322             dev->host_hw_state, dev->me_hw_state);
 323
 324         if (unexpected)
 325                 dev_warn(&dev->pdev->dev, "unexpected reset.\n");
 326
 327         /* Wake up all readings so they can be interrupted */
 328         list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
 329                 if (waitqueue_active(&cl_pos->rx_wait)) {
 330                         dev_dbg(&dev->pdev->dev, "Waking up client!\n");
 331                         wake_up_interruptible(&cl_pos->rx_wait);
 332                 }
 333         }
 334         /* remove all waiting requests */
 335         list_for_each_entry_safe(cb_pos, cb_next,
 336                         &dev->write_list.mei_cb.cb_list, cb_list) {
 337                 list_del(&cb_pos->cb_list);
 338                 mei_free_cb_private(cb_pos);
 339         }
 340 }
 341
 342
 343
 344 /**
 345  * host_start_message - mei host sends start message.
 346  *
 347  * @dev: the device structure
 348  *
 349  * returns none.
 350  */
 351 void mei_host_start_message(struct mei_device *dev)
 352 {
 353         struct mei_msg_hdr *mei_hdr;
 354         struct hbm_host_version_request *host_start_req;
 355
 356         /* host start message */
 357         mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
 358         mei_hdr->host_addr = 0;
 359         mei_hdr->me_addr = 0;
 360         mei_hdr->length = sizeof(struct hbm_host_version_request);
 361         mei_hdr->msg_complete = 1;
 362         mei_hdr->reserved = 0;
 363
 364         host_start_req =
 365             (struct hbm_host_version_request *) &dev->wr_msg_buf[1];
 366         memset(host_start_req, 0, sizeof(struct hbm_host_version_request));
 367         host_start_req->hbm_cmd = HOST_START_REQ_CMD;
 368         host_start_req->host_version.major_version = HBM_MAJOR_VERSION;
 369         host_start_req->host_version.minor_version = HBM_MINOR_VERSION;
 370         dev->recvd_msg = false;
 371         if (mei_write_message(dev, mei_hdr, (unsigned char *)host_start_req,
 372                                        mei_hdr->length)) {
 373                 dev_dbg(&dev->pdev->dev, "write send version message to FW fail.\n");
 374                 dev->mei_state = MEI_RESETING;
 375                 mei_reset(dev, 1);
 376         }
 377         dev->init_clients_state = MEI_START_MESSAGE;
 378         dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
 379         return ;
 380 }
 381
 382 /**
 383  * host_enum_clients_message - host sends enumeration client request message.
 384  *
 385  * @dev: the device structure
 386  *
 387  * returns none.
 388  */
 389 void mei_host_enum_clients_message(struct mei_device *dev)
 390 {
 391         struct mei_msg_hdr *mei_hdr;
 392         struct hbm_host_enum_request *host_enum_req;
 393         mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
 394         /* enumerate clients */
 395         mei_hdr->host_addr = 0;
 396         mei_hdr->me_addr = 0;
 397         mei_hdr->length = sizeof(struct hbm_host_enum_request);
 398         mei_hdr->msg_complete = 1;
 399         mei_hdr->reserved = 0;
 400
 401         host_enum_req = (struct hbm_host_enum_request *) &dev->wr_msg_buf[1];
 402         memset(host_enum_req, 0, sizeof(struct hbm_host_enum_request));
 403         host_enum_req->hbm_cmd = HOST_ENUM_REQ_CMD;
 404         if (mei_write_message(dev, mei_hdr, (unsigned char *)host_enum_req,
 405                                 mei_hdr->length)) {
 406                 dev->mei_state = MEI_RESETING;
 407                 dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
 408                 mei_reset(dev, 1);
 409         }
 410         dev->init_clients_state = MEI_ENUM_CLIENTS_MESSAGE;
 411         dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
 412         return;
 413 }
 414
 415
 416 /**
 417  * allocate_me_clients_storage - allocates storage for me clients
 418  *
 419  * @dev: the device structure
 420  *
 421  * returns none.
 422  */
 423 void mei_allocate_me_clients_storage(struct mei_device *dev)
 424 {
 425         struct mei_me_client *clients;
 426         int b;
 427
 428         /* count how many ME clients we have */
 429         for_each_set_bit(b, dev->me_clients_map, MEI_CLIENTS_MAX)
 430                 dev->me_clients_num++;
 431
 432         if (dev->me_clients_num <= 0)
 433                 return ;
 434
 435
 436         if (dev->me_clients != NULL) {
 437                 kfree(dev->me_clients);
 438                 dev->me_clients = NULL;
 439         }
 440         dev_dbg(&dev->pdev->dev, "memory allocation for ME clients size=%zd.\n",
 441                 dev->me_clients_num * sizeof(struct mei_me_client));
 442         /* allocate storage for ME clients representation */
 443         clients = kcalloc(dev->me_clients_num,
 444                         sizeof(struct mei_me_client), GFP_KERNEL);
 445         if (!clients) {
 446                 dev_dbg(&dev->pdev->dev, "memory allocation for ME clients failed.\n");
 447                 dev->mei_state = MEI_RESETING;
 448                 mei_reset(dev, 1);
 449                 return ;
 450         }
 451         dev->me_clients = clients;
 452         return ;
 453 }
 454 /**
 455  * host_client_properties - reads properties for client
 456  *
 457  * @dev: the device structure
 458  *
 459  * returns:
 460  *      < 0 - Error.
 461  *  = 0 - no more clients.
 462  *  = 1 - still have clients to send properties request.
 463  */
 464 int mei_host_client_properties(struct mei_device *dev)
 465 {
 466         struct mei_msg_hdr *mei_header;
 467         struct hbm_props_request *host_cli_req;
 468         int b;
 469         u8 client_num = dev->me_client_presentation_num;
 470
 471         b = dev->me_client_index;
 472         b = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, b);
 473         if (b < MEI_CLIENTS_MAX) {
 474                 dev->me_clients[client_num].client_id = b;
 475                 dev->me_clients[client_num].mei_flow_ctrl_creds = 0;
 476                 mei_header = (struct mei_msg_hdr *)&dev->wr_msg_buf[0];
 477                 mei_header->host_addr = 0;
 478                 mei_header->me_addr = 0;
 479                 mei_header->length = sizeof(struct hbm_props_request);
 480                 mei_header->msg_complete = 1;
 481                 mei_header->reserved = 0;
 482
 483                 host_cli_req = (struct hbm_props_request *)&dev->wr_msg_buf[1];
 484
 485                 memset(host_cli_req, 0, sizeof(struct hbm_props_request));
 486
 487                 host_cli_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
 488                 host_cli_req->address = b;
 489
 490                 if (mei_write_message(dev, mei_header,
 491                                 (unsigned char *)host_cli_req,
 492                                 mei_header->length)) {
 493                         dev->mei_state = MEI_RESETING;
 494                         dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
 495                         mei_reset(dev, 1);
 496                         return -EIO;
 497                 }
 498
 499                 dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
 500                 dev->me_client_index = b;
 501                 return 1;
 502         }
 503
 504         return 0;
 505 }
 506
 507 /**
 508  * mei_init_file_private - initializes private file structure.
 509  *
 510  * @priv: private file structure to be initialized
 511  * @file: the file structure
 512  */
 513 void mei_cl_init(struct mei_cl *priv, struct mei_device *dev)
 514 {
 515         memset(priv, 0, sizeof(struct mei_cl));
 516         init_waitqueue_head(&priv->wait);
 517         init_waitqueue_head(&priv->rx_wait);
 518         init_waitqueue_head(&priv->tx_wait);
 519         INIT_LIST_HEAD(&priv->link);
 520         priv->reading_state = MEI_IDLE;
 521         priv->writing_state = MEI_IDLE;
 522         priv->dev = dev;
 523 }
 524
 525 int mei_find_me_client_index(const struct mei_device *dev, uuid_le cuuid)
 526 {
 527         int i, res = -1;
 528
 529         for (i = 0; i < dev->me_clients_num; ++i)
 530                 if (uuid_le_cmp(cuuid,
 531                                 dev->me_clients[i].props.protocol_name) == 0) {
 532                         res = i;
 533                         break;
 534                 }
 535
 536         return res;
 537 }
 538
 539
 540 /**
 541  * mei_find_me_client_update_filext - searches for ME client guid
 542  *                       sets client_id in mei_file_private if found
 543  * @dev: the device structure
 544  * @priv: private file structure to set client_id in
 545  * @cguid: searched guid of ME client
 546  * @client_id: id of host client to be set in file private structure
 547  *
 548  * returns ME client index
 549  */
 550 u8 mei_find_me_client_update_filext(struct mei_device *dev, struct mei_cl *priv,
 551                                 const uuid_le *cguid, u8 client_id)
 552 {
 553         int i;
 554
 555         if (!dev || !priv || !cguid)
 556                 return 0;
 557
 558         /* check for valid client id */
 559         i = mei_find_me_client_index(dev, *cguid);
 560         if (i >= 0) {
 561                 priv->me_client_id = dev->me_clients[i].client_id;
 562                 priv->state = MEI_FILE_CONNECTING;
 563                 priv->host_client_id = client_id;
 564
 565                 list_add_tail(&priv->link, &dev->file_list);
 566                 return (u8)i;
 567         }
 568
 569         return 0;
 570 }
 571
 572 /**
 573  * host_init_iamthif - mei initialization iamthif client.
 574  *
 575  * @dev: the device structure
 576  *
 577  */
 578 void mei_host_init_iamthif(struct mei_device *dev)
 579 {
 580         u8 i;
 581         unsigned char *msg_buf;
 582
 583         mei_cl_init(&dev->iamthif_cl, dev);
 584         dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
 585
 586         /* find ME amthi client */
 587         i = mei_find_me_client_update_filext(dev, &dev->iamthif_cl,
 588                             &mei_amthi_guid, MEI_IAMTHIF_HOST_CLIENT_ID);
 589         if (dev->iamthif_cl.state != MEI_FILE_CONNECTING) {
 590                 dev_dbg(&dev->pdev->dev, "failed to find iamthif client.\n");
 591                 return;
 592         }
 593
 594         /* Assign iamthif_mtu to the value received from ME  */
 595
 596         dev->iamthif_mtu = dev->me_clients[i].props.max_msg_length;
 597         dev_dbg(&dev->pdev->dev, "IAMTHIF_MTU = %d\n",
 598                         dev->me_clients[i].props.max_msg_length);
 599
 600         kfree(dev->iamthif_msg_buf);
 601         dev->iamthif_msg_buf = NULL;
 602
 603         /* allocate storage for ME message buffer */
 604         msg_buf = kcalloc(dev->iamthif_mtu,
 605                         sizeof(unsigned char), GFP_KERNEL);
 606         if (!msg_buf) {
 607                 dev_dbg(&dev->pdev->dev, "memory allocation for ME message buffer failed.\n");
 608                 return;
 609         }
 610
 611         dev->iamthif_msg_buf = msg_buf;
 612
 613         if (mei_connect(dev, &dev->iamthif_cl)) {
 614                 dev_dbg(&dev->pdev->dev, "Failed to connect to AMTHI client\n");
 615                 dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
 616                 dev->iamthif_cl.host_client_id = 0;
 617         } else {
 618                 dev->iamthif_cl.timer_count = CONNECT_TIMEOUT;
 619         }
 620 }
 621
 622 /**
 623  * mei_alloc_file_private - allocates a private file structure and sets it up.
 624  * @file: the file structure
 625  *
 626  * returns  The allocated file or NULL on failure
 627  */
 628 struct mei_cl *mei_cl_allocate(struct mei_device *dev)
 629 {
 630         struct mei_cl *cl;
 631
 632         cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
 633         if (!cl)
 634                 return NULL;
 635
 636         mei_cl_init(cl, dev);
 637
 638         return cl;
 639 }
 640
 641
 642
 643 /**
 644  * mei_disconnect_host_client - sends disconnect message to fw from host client.
 645  *
 646  * @dev: the device structure
 647  * @cl: private data of the file object
 648  *
 649  * Locking: called under "dev->device_lock" lock
 650  *
 651  * returns 0 on success, <0 on failure.
 652  */
 653 int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *cl)
 654 {
 655         int rets, err;
 656         long timeout = 15;      /* 15 seconds */
 657         struct mei_cl_cb *cb;
 658
 659         if (!dev || !cl)
 660                 return -ENODEV;
 661
 662         if (cl->state != MEI_FILE_DISCONNECTING)
 663                 return 0;
 664
 665         cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
 666         if (!cb)
 667                 return -ENOMEM;
 668
 669         INIT_LIST_HEAD(&cb->cb_list);
 670         cb->file_private = cl;
 671         cb->major_file_operations = MEI_CLOSE;
 672         if (dev->mei_host_buffer_is_empty) {
 673                 dev->mei_host_buffer_is_empty = false;
 674                 if (mei_disconnect(dev, cl)) {
 675                         rets = -ENODEV;
 676                         dev_dbg(&dev->pdev->dev, "failed to call mei_disconnect.\n");
 677                         goto free;
 678                 }
 679                 mdelay(10); /* Wait for hardware disconnection ready */
 680                 list_add_tail(&cb->cb_list, &dev->ctrl_rd_list.mei_cb.cb_list);
 681         } else {
 682                 dev_dbg(&dev->pdev->dev, "add disconnect cb to control write list\n");
 683                 list_add_tail(&cb->cb_list,
 684                                 &dev->ctrl_wr_list.mei_cb.cb_list);
 685         }
 686         mutex_unlock(&dev->device_lock);
 687
 688         err = wait_event_timeout(dev->wait_recvd_msg,
 689                  (MEI_FILE_DISCONNECTED == cl->state),
 690                  timeout * HZ);
 691
 692         mutex_lock(&dev->device_lock);
 693         if (MEI_FILE_DISCONNECTED == cl->state) {
 694                 rets = 0;
 695                 dev_dbg(&dev->pdev->dev, "successfully disconnected from FW client.\n");
 696         } else {
 697                 rets = -ENODEV;
 698                 if (MEI_FILE_DISCONNECTED != cl->state)
 699                         dev_dbg(&dev->pdev->dev, "wrong status client disconnect.\n");
 700
 701                 if (err)
 702                         dev_dbg(&dev->pdev->dev,
 703                                         "wait failed disconnect err=%08x\n",
 704                                         err);
 705
 706                 dev_dbg(&dev->pdev->dev, "failed to disconnect from FW client.\n");
 707         }
 708
 709         mei_io_list_flush(&dev->ctrl_rd_list, cl);
 710         mei_io_list_flush(&dev->ctrl_wr_list, cl);
 711 free:
 712         mei_free_cb_private(cb);
 713         return rets;
 714 }
 715
 716 /**
 717  * mei_remove_client_from_file_list -
 718  *      removes file private data from device file list
 719  *
 720  * @dev: the device structure
 721  * @host_client_id: host client id to be removed
 722  */
 723 void mei_remove_client_from_file_list(struct mei_device *dev,
 724                                        u8 host_client_id)
 725 {
 726         struct mei_cl *cl_pos = NULL;
 727         struct mei_cl *cl_next = NULL;
 728         list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
 729                 if (host_client_id == cl_pos->host_client_id) {
 730                         dev_dbg(&dev->pdev->dev, "remove host client = %d, ME client = %d\n",
 731                                         cl_pos->host_client_id,
 732                                         cl_pos->me_client_id);
 733                         list_del_init(&cl_pos->link);
 734                         break;
 735                 }
 736         }
 737 }