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 char *mei_dev_state_str(int state)
  28 {
  29 #define MEI_DEV_STATE(state) case MEI_DEV_##state: return #state
  30         switch (state) {
  31         MEI_DEV_STATE(INITIALIZING);
  32         MEI_DEV_STATE(INIT_CLIENTS);
  33         MEI_DEV_STATE(ENABLED);
  34         MEI_DEV_STATE(RESETING);
  35         MEI_DEV_STATE(DISABLED);
  36         MEI_DEV_STATE(RECOVERING_FROM_RESET);
  37         MEI_DEV_STATE(POWER_DOWN);
  38         MEI_DEV_STATE(POWER_UP);
  39         default:
  40                 return "unkown";
  41         }
  42 #undef MEI_DEV_STATE
  43 }
  44
  45
  46 const uuid_le mei_amthi_guid  = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d, 0xac,
  47                                                 0xa8, 0x46, 0xe0, 0xff, 0x65,
  48                                                 0x81, 0x4c);
  49
  50 /**
  51  * mei_io_list_init - Sets up a queue list.
  52  *
  53  * @list: An instance io list structure
  54  * @dev: the device structure
  55  */
  56 void mei_io_list_init(struct mei_io_list *list)
  57 {
  58         /* initialize our queue list */
  59         INIT_LIST_HEAD(&list->mei_cb.cb_list);
  60 }
  61
  62 /**
  63  * mei_io_list_flush - removes list entry belonging to cl.
  64  *
  65  * @list:  An instance of our list structure
  66  * @cl: private data of the file object
  67  */
  68 void mei_io_list_flush(struct mei_io_list *list, struct mei_cl *cl)
  69 {
  70         struct mei_cl_cb *pos;
  71         struct mei_cl_cb *next;
  72
  73         list_for_each_entry_safe(pos, next, &list->mei_cb.cb_list, cb_list) {
  74                 if (pos->file_private) {
  75                         struct mei_cl *cl_tmp;
  76                         cl_tmp = (struct mei_cl *)pos->file_private;
  77                         if (mei_cl_cmp_id(cl, cl_tmp))
  78                                 list_del(&pos->cb_list);
  79                 }
  80         }
  81 }
  82 /**
  83  * mei_cl_flush_queues - flushes queue lists belonging to cl.
  84  *
  85  * @dev: the device structure
  86  * @cl: private data of the file object
  87  */
  88 int mei_cl_flush_queues(struct mei_cl *cl)
  89 {
  90         if (!cl || !cl->dev)
  91                 return -EINVAL;
  92
  93         dev_dbg(&cl->dev->pdev->dev, "remove list entry belonging to cl\n");
  94         mei_io_list_flush(&cl->dev->read_list, cl);
  95         mei_io_list_flush(&cl->dev->write_list, cl);
  96         mei_io_list_flush(&cl->dev->write_waiting_list, cl);
  97         mei_io_list_flush(&cl->dev->ctrl_wr_list, cl);
  98         mei_io_list_flush(&cl->dev->ctrl_rd_list, cl);
  99         mei_io_list_flush(&cl->dev->amthi_cmd_list, cl);
 100         mei_io_list_flush(&cl->dev->amthi_read_complete_list, cl);
 101         return 0;
 102 }
 103
 104
 105
 106 /**
 107  * mei_reset_iamthif_params - initializes mei device iamthif
 108  *
 109  * @dev: the device structure
 110  */
 111 static void mei_reset_iamthif_params(struct mei_device *dev)
 112 {
 113         /* reset iamthif parameters. */
 114         dev->iamthif_current_cb = NULL;
 115         dev->iamthif_msg_buf_size = 0;
 116         dev->iamthif_msg_buf_index = 0;
 117         dev->iamthif_canceled = false;
 118         dev->iamthif_ioctl = false;
 119         dev->iamthif_state = MEI_IAMTHIF_IDLE;
 120         dev->iamthif_timer = 0;
 121 }
 122
 123 /**
 124  * init_mei_device - allocates and initializes the mei device structure
 125  *
 126  * @pdev: The pci device structure
 127  *
 128  * returns The mei_device_device pointer on success, NULL on failure.
 129  */
 130 struct mei_device *mei_device_init(struct pci_dev *pdev)
 131 {
 132         struct mei_device *dev;
 133
 134         dev = kzalloc(sizeof(struct mei_device), GFP_KERNEL);
 135         if (!dev)
 136                 return NULL;
 137
 138         /* setup our list array */
 139         INIT_LIST_HEAD(&dev->file_list);
 140         INIT_LIST_HEAD(&dev->wd_cl.link);
 141         INIT_LIST_HEAD(&dev->iamthif_cl.link);
 142         mutex_init(&dev->device_lock);
 143         init_waitqueue_head(&dev->wait_recvd_msg);
 144         init_waitqueue_head(&dev->wait_stop_wd);
 145         dev->dev_state = MEI_DEV_INITIALIZING;
 146         dev->iamthif_state = MEI_IAMTHIF_IDLE;
 147         dev->wd_interface_reg = false;
 148
 149
 150         mei_io_list_init(&dev->read_list);
 151         mei_io_list_init(&dev->write_list);
 152         mei_io_list_init(&dev->write_waiting_list);
 153         mei_io_list_init(&dev->ctrl_wr_list);
 154         mei_io_list_init(&dev->ctrl_rd_list);
 155         mei_io_list_init(&dev->amthi_cmd_list);
 156         mei_io_list_init(&dev->amthi_read_complete_list);
 157         dev->pdev = pdev;
 158         return dev;
 159 }
 160
 161 /**
 162  * mei_hw_init - initializes host and fw to start work.
 163  *
 164  * @dev: the device structure
 165  *
 166  * returns 0 on success, <0 on failure.
 167  */
 168 int mei_hw_init(struct mei_device *dev)
 169 {
 170         int err = 0;
 171         int ret;
 172
 173         mutex_lock(&dev->device_lock);
 174
 175         dev->host_hw_state = mei_hcsr_read(dev);
 176         dev->me_hw_state = mei_mecsr_read(dev);
 177         dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, mestate = 0x%08x.\n",
 178             dev->host_hw_state, dev->me_hw_state);
 179
 180         /* acknowledge interrupt and stop interupts */
 181         if ((dev->host_hw_state & H_IS) == H_IS)
 182                 mei_reg_write(dev, H_CSR, dev->host_hw_state);
 183
 184         /* Doesn't change in runtime */
 185         dev->hbuf_depth = (dev->host_hw_state & H_CBD) >> 24;
 186
 187         dev->recvd_msg = false;
 188         dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
 189
 190         mei_reset(dev, 1);
 191
 192         dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
 193             dev->host_hw_state, dev->me_hw_state);
 194
 195         /* wait for ME to turn on ME_RDY */
 196         if (!dev->recvd_msg) {
 197                 mutex_unlock(&dev->device_lock);
 198                 err = wait_event_interruptible_timeout(dev->wait_recvd_msg,
 199                         dev->recvd_msg, MEI_INTEROP_TIMEOUT);
 200                 mutex_lock(&dev->device_lock);
 201         }
 202
 203         if (err <= 0 && !dev->recvd_msg) {
 204                 dev->dev_state = MEI_DEV_DISABLED;
 205                 dev_dbg(&dev->pdev->dev,
 206                         "wait_event_interruptible_timeout failed"
 207                         "on wait for ME to turn on ME_RDY.\n");
 208                 ret = -ENODEV;
 209                 goto out;
 210         }
 211
 212         if (!(((dev->host_hw_state & H_RDY) == H_RDY) &&
 213               ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA))) {
 214                 dev->dev_state = MEI_DEV_DISABLED;
 215                 dev_dbg(&dev->pdev->dev,
 216                         "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
 217                         dev->host_hw_state, dev->me_hw_state);
 218
 219                 if (!(dev->host_hw_state & H_RDY))
 220                         dev_dbg(&dev->pdev->dev, "host turn off H_RDY.\n");
 221
 222                 if (!(dev->me_hw_state & ME_RDY_HRA))
 223                         dev_dbg(&dev->pdev->dev, "ME turn off ME_RDY.\n");
 224
 225                 dev_err(&dev->pdev->dev, "link layer initialization failed.\n");
 226                 ret = -ENODEV;
 227                 goto out;
 228         }
 229
 230         if (dev->version.major_version != HBM_MAJOR_VERSION ||
 231             dev->version.minor_version != HBM_MINOR_VERSION) {
 232                 dev_dbg(&dev->pdev->dev, "MEI start failed.\n");
 233                 ret = -ENODEV;
 234                 goto out;
 235         }
 236
 237         dev->recvd_msg = false;
 238         dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
 239             dev->host_hw_state, dev->me_hw_state);
 240         dev_dbg(&dev->pdev->dev, "ME turn on ME_RDY and host turn on H_RDY.\n");
 241         dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
 242         dev_dbg(&dev->pdev->dev, "MEI  start success.\n");
 243         ret = 0;
 244
 245 out:
 246         mutex_unlock(&dev->device_lock);
 247         return ret;
 248 }
 249
 250 /**
 251  * mei_hw_reset - resets fw via mei csr register.
 252  *
 253  * @dev: the device structure
 254  * @interrupts_enabled: if interrupt should be enabled after reset.
 255  */
 256 static void mei_hw_reset(struct mei_device *dev, int interrupts_enabled)
 257 {
 258         dev->host_hw_state |= (H_RST | H_IG);
 259
 260         if (interrupts_enabled)
 261                 mei_enable_interrupts(dev);
 262         else
 263                 mei_disable_interrupts(dev);
 264 }
 265
 266 /**
 267  * mei_reset - resets host and fw.
 268  *
 269  * @dev: the device structure
 270  * @interrupts_enabled: if interrupt should be enabled after reset.
 271  */
 272 void mei_reset(struct mei_device *dev, int interrupts_enabled)
 273 {
 274         struct mei_cl *cl_pos = NULL;
 275         struct mei_cl *cl_next = NULL;
 276         struct mei_cl_cb *cb_pos = NULL;
 277         struct mei_cl_cb *cb_next = NULL;
 278         bool unexpected;
 279
 280         if (dev->dev_state == MEI_DEV_RECOVERING_FROM_RESET) {
 281                 dev->need_reset = true;
 282                 return;
 283         }
 284
 285         unexpected = (dev->dev_state != MEI_DEV_INITIALIZING &&
 286                         dev->dev_state != MEI_DEV_DISABLED &&
 287                         dev->dev_state != MEI_DEV_POWER_DOWN &&
 288                         dev->dev_state != MEI_DEV_POWER_UP);
 289
 290         dev->host_hw_state = mei_hcsr_read(dev);
 291
 292         dev_dbg(&dev->pdev->dev, "before reset host_hw_state = 0x%08x.\n",
 293             dev->host_hw_state);
 294
 295         mei_hw_reset(dev, interrupts_enabled);
 296
 297         dev->host_hw_state &= ~H_RST;
 298         dev->host_hw_state |= H_IG;
 299
 300         mei_hcsr_set(dev);
 301
 302         dev_dbg(&dev->pdev->dev, "currently saved host_hw_state = 0x%08x.\n",
 303             dev->host_hw_state);
 304
 305         dev->need_reset = false;
 306
 307         if (dev->dev_state != MEI_DEV_INITIALIZING) {
 308                 if (dev->dev_state != MEI_DEV_DISABLED &&
 309                     dev->dev_state != MEI_DEV_POWER_DOWN)
 310                         dev->dev_state = MEI_DEV_RESETING;
 311
 312                 list_for_each_entry_safe(cl_pos,
 313                                 cl_next, &dev->file_list, link) {
 314                         cl_pos->state = MEI_FILE_DISCONNECTED;
 315                         cl_pos->mei_flow_ctrl_creds = 0;
 316                         cl_pos->read_cb = NULL;
 317                         cl_pos->timer_count = 0;
 318                 }
 319                 /* remove entry if already in list */
 320                 dev_dbg(&dev->pdev->dev, "list del iamthif and wd file list.\n");
 321                 mei_remove_client_from_file_list(dev,
 322                                 dev->wd_cl.host_client_id);
 323
 324                 mei_remove_client_from_file_list(dev,
 325                                 dev->iamthif_cl.host_client_id);
 326
 327                 mei_reset_iamthif_params(dev);
 328                 dev->extra_write_index = 0;
 329         }
 330
 331         dev->me_clients_num = 0;
 332         dev->rd_msg_hdr = 0;
 333         dev->wd_pending = false;
 334
 335         /* update the state of the registers after reset */
 336         dev->host_hw_state = mei_hcsr_read(dev);
 337         dev->me_hw_state = mei_mecsr_read(dev);
 338
 339         dev_dbg(&dev->pdev->dev, "after reset host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
 340             dev->host_hw_state, dev->me_hw_state);
 341
 342         if (unexpected)
 343                 dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
 344                          mei_dev_state_str(dev->dev_state));
 345
 346         /* Wake up all readings so they can be interrupted */
 347         list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
 348                 if (waitqueue_active(&cl_pos->rx_wait)) {
 349                         dev_dbg(&dev->pdev->dev, "Waking up client!\n");
 350                         wake_up_interruptible(&cl_pos->rx_wait);
 351                 }
 352         }
 353         /* remove all waiting requests */
 354         list_for_each_entry_safe(cb_pos, cb_next,
 355                         &dev->write_list.mei_cb.cb_list, cb_list) {
 356                 list_del(&cb_pos->cb_list);
 357                 mei_free_cb_private(cb_pos);
 358         }
 359 }
 360
 361
 362
 363 /**
 364  * host_start_message - mei host sends start message.
 365  *
 366  * @dev: the device structure
 367  *
 368  * returns none.
 369  */
 370 void mei_host_start_message(struct mei_device *dev)
 371 {
 372         struct mei_msg_hdr *mei_hdr;
 373         struct hbm_host_version_request *host_start_req;
 374
 375         /* host start message */
 376         mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
 377         mei_hdr->host_addr = 0;
 378         mei_hdr->me_addr = 0;
 379         mei_hdr->length = sizeof(struct hbm_host_version_request);
 380         mei_hdr->msg_complete = 1;
 381         mei_hdr->reserved = 0;
 382
 383         host_start_req =
 384             (struct hbm_host_version_request *) &dev->wr_msg_buf[1];
 385         memset(host_start_req, 0, sizeof(struct hbm_host_version_request));
 386         host_start_req->hbm_cmd = HOST_START_REQ_CMD;
 387         host_start_req->host_version.major_version = HBM_MAJOR_VERSION;
 388         host_start_req->host_version.minor_version = HBM_MINOR_VERSION;
 389         dev->recvd_msg = false;
 390         if (mei_write_message(dev, mei_hdr, (unsigned char *)host_start_req,
 391                                        mei_hdr->length)) {
 392                 dev_dbg(&dev->pdev->dev, "write send version message to FW fail.\n");
 393                 dev->dev_state = MEI_DEV_RESETING;
 394                 mei_reset(dev, 1);
 395         }
 396         dev->init_clients_state = MEI_START_MESSAGE;
 397         dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
 398         return ;
 399 }
 400
 401 /**
 402  * host_enum_clients_message - host sends enumeration client request message.
 403  *
 404  * @dev: the device structure
 405  *
 406  * returns none.
 407  */
 408 void mei_host_enum_clients_message(struct mei_device *dev)
 409 {
 410         struct mei_msg_hdr *mei_hdr;
 411         struct hbm_host_enum_request *host_enum_req;
 412         mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
 413         /* enumerate clients */
 414         mei_hdr->host_addr = 0;
 415         mei_hdr->me_addr = 0;
 416         mei_hdr->length = sizeof(struct hbm_host_enum_request);
 417         mei_hdr->msg_complete = 1;
 418         mei_hdr->reserved = 0;
 419
 420         host_enum_req = (struct hbm_host_enum_request *) &dev->wr_msg_buf[1];
 421         memset(host_enum_req, 0, sizeof(struct hbm_host_enum_request));
 422         host_enum_req->hbm_cmd = HOST_ENUM_REQ_CMD;
 423         if (mei_write_message(dev, mei_hdr, (unsigned char *)host_enum_req,
 424                                 mei_hdr->length)) {
 425                 dev->dev_state = MEI_DEV_RESETING;
 426                 dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
 427                 mei_reset(dev, 1);
 428         }
 429         dev->init_clients_state = MEI_ENUM_CLIENTS_MESSAGE;
 430         dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
 431         return;
 432 }
 433
 434
 435 /**
 436  * allocate_me_clients_storage - allocates storage for me clients
 437  *
 438  * @dev: the device structure
 439  *
 440  * returns none.
 441  */
 442 void mei_allocate_me_clients_storage(struct mei_device *dev)
 443 {
 444         struct mei_me_client *clients;
 445         int b;
 446
 447         /* count how many ME clients we have */
 448         for_each_set_bit(b, dev->me_clients_map, MEI_CLIENTS_MAX)
 449                 dev->me_clients_num++;
 450
 451         if (dev->me_clients_num <= 0)
 452                 return ;
 453
 454
 455         if (dev->me_clients != NULL) {
 456                 kfree(dev->me_clients);
 457                 dev->me_clients = NULL;
 458         }
 459         dev_dbg(&dev->pdev->dev, "memory allocation for ME clients size=%zd.\n",
 460                 dev->me_clients_num * sizeof(struct mei_me_client));
 461         /* allocate storage for ME clients representation */
 462         clients = kcalloc(dev->me_clients_num,
 463                         sizeof(struct mei_me_client), GFP_KERNEL);
 464         if (!clients) {
 465                 dev_dbg(&dev->pdev->dev, "memory allocation for ME clients failed.\n");
 466                 dev->dev_state = MEI_DEV_RESETING;
 467                 mei_reset(dev, 1);
 468                 return ;
 469         }
 470         dev->me_clients = clients;
 471         return ;
 472 }
 473 /**
 474  * host_client_properties - reads properties for client
 475  *
 476  * @dev: the device structure
 477  *
 478  * returns:
 479  *      < 0 - Error.
 480  *  = 0 - no more clients.
 481  *  = 1 - still have clients to send properties request.
 482  */
 483 int mei_host_client_properties(struct mei_device *dev)
 484 {
 485         struct mei_msg_hdr *mei_header;
 486         struct hbm_props_request *host_cli_req;
 487         int b;
 488         u8 client_num = dev->me_client_presentation_num;
 489
 490         b = dev->me_client_index;
 491         b = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, b);
 492         if (b < MEI_CLIENTS_MAX) {
 493                 dev->me_clients[client_num].client_id = b;
 494                 dev->me_clients[client_num].mei_flow_ctrl_creds = 0;
 495                 mei_header = (struct mei_msg_hdr *)&dev->wr_msg_buf[0];
 496                 mei_header->host_addr = 0;
 497                 mei_header->me_addr = 0;
 498                 mei_header->length = sizeof(struct hbm_props_request);
 499                 mei_header->msg_complete = 1;
 500                 mei_header->reserved = 0;
 501
 502                 host_cli_req = (struct hbm_props_request *)&dev->wr_msg_buf[1];
 503
 504                 memset(host_cli_req, 0, sizeof(struct hbm_props_request));
 505
 506                 host_cli_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
 507                 host_cli_req->address = b;
 508
 509                 if (mei_write_message(dev, mei_header,
 510                                 (unsigned char *)host_cli_req,
 511                                 mei_header->length)) {
 512                         dev->dev_state = MEI_DEV_RESETING;
 513                         dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
 514                         mei_reset(dev, 1);
 515                         return -EIO;
 516                 }
 517
 518                 dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
 519                 dev->me_client_index = b;
 520                 return 1;
 521         }
 522
 523         return 0;
 524 }
 525
 526 /**
 527  * mei_init_file_private - initializes private file structure.
 528  *
 529  * @priv: private file structure to be initialized
 530  * @file: the file structure
 531  */
 532 void mei_cl_init(struct mei_cl *priv, struct mei_device *dev)
 533 {
 534         memset(priv, 0, sizeof(struct mei_cl));
 535         init_waitqueue_head(&priv->wait);
 536         init_waitqueue_head(&priv->rx_wait);
 537         init_waitqueue_head(&priv->tx_wait);
 538         INIT_LIST_HEAD(&priv->link);
 539         priv->reading_state = MEI_IDLE;
 540         priv->writing_state = MEI_IDLE;
 541         priv->dev = dev;
 542 }
 543
 544 int mei_me_cl_by_uuid(const struct mei_device *dev, const uuid_le *cuuid)
 545 {
 546         int i, res = -ENOENT;
 547
 548         for (i = 0; i < dev->me_clients_num; ++i)
 549                 if (uuid_le_cmp(*cuuid,
 550                                 dev->me_clients[i].props.protocol_name) == 0) {
 551                         res = i;
 552                         break;
 553                 }
 554
 555         return res;
 556 }
 557
 558
 559 /**
 560  * mei_me_cl_update_filext - searches for ME client guid
 561  *                       sets client_id in mei_file_private if found
 562  * @dev: the device structure
 563  * @cl: private file structure to set client_id in
 564  * @cuuid: searched uuid of ME client
 565  * @client_id: id of host client to be set in file private structure
 566  *
 567  * returns ME client index
 568  */
 569 int mei_me_cl_update_filext(struct mei_device *dev, struct mei_cl *cl,
 570                                 const uuid_le *cuuid, u8 host_cl_id)
 571 {
 572         int i;
 573
 574         if (!dev || !cl || !cuuid)
 575                 return -EINVAL;
 576
 577         /* check for valid client id */
 578         i = mei_me_cl_by_uuid(dev, cuuid);
 579         if (i >= 0) {
 580                 cl->me_client_id = dev->me_clients[i].client_id;
 581                 cl->state = MEI_FILE_CONNECTING;
 582                 cl->host_client_id = host_cl_id;
 583
 584                 list_add_tail(&cl->link, &dev->file_list);
 585                 return (u8)i;
 586         }
 587
 588         return -ENOENT;
 589 }
 590
 591 /**
 592  * host_init_iamthif - mei initialization iamthif client.
 593  *
 594  * @dev: the device structure
 595  *
 596  */
 597 void mei_host_init_iamthif(struct mei_device *dev)
 598 {
 599         int i;
 600         unsigned char *msg_buf;
 601
 602         mei_cl_init(&dev->iamthif_cl, dev);
 603         dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
 604
 605         /* find ME amthi client */
 606         i = mei_me_cl_update_filext(dev, &dev->iamthif_cl,
 607                             &mei_amthi_guid, MEI_IAMTHIF_HOST_CLIENT_ID);
 608         if (i < 0) {
 609                 dev_dbg(&dev->pdev->dev, "failed to find iamthif client.\n");
 610                 return;
 611         }
 612
 613         /* Assign iamthif_mtu to the value received from ME  */
 614
 615         dev->iamthif_mtu = dev->me_clients[i].props.max_msg_length;
 616         dev_dbg(&dev->pdev->dev, "IAMTHIF_MTU = %d\n",
 617                         dev->me_clients[i].props.max_msg_length);
 618
 619         kfree(dev->iamthif_msg_buf);
 620         dev->iamthif_msg_buf = NULL;
 621
 622         /* allocate storage for ME message buffer */
 623         msg_buf = kcalloc(dev->iamthif_mtu,
 624                         sizeof(unsigned char), GFP_KERNEL);
 625         if (!msg_buf) {
 626                 dev_dbg(&dev->pdev->dev, "memory allocation for ME message buffer failed.\n");
 627                 return;
 628         }
 629
 630         dev->iamthif_msg_buf = msg_buf;
 631
 632         if (mei_connect(dev, &dev->iamthif_cl)) {
 633                 dev_dbg(&dev->pdev->dev, "Failed to connect to AMTHI client\n");
 634                 dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
 635                 dev->iamthif_cl.host_client_id = 0;
 636         } else {
 637                 dev->iamthif_cl.timer_count = CONNECT_TIMEOUT;
 638         }
 639 }
 640
 641 /**
 642  * mei_alloc_file_private - allocates a private file structure and sets it up.
 643  * @file: the file structure
 644  *
 645  * returns  The allocated file or NULL on failure
 646  */
 647 struct mei_cl *mei_cl_allocate(struct mei_device *dev)
 648 {
 649         struct mei_cl *cl;
 650
 651         cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
 652         if (!cl)
 653                 return NULL;
 654
 655         mei_cl_init(cl, dev);
 656
 657         return cl;
 658 }
 659
 660
 661
 662 /**
 663  * mei_disconnect_host_client - sends disconnect message to fw from host client.
 664  *
 665  * @dev: the device structure
 666  * @cl: private data of the file object
 667  *
 668  * Locking: called under "dev->device_lock" lock
 669  *
 670  * returns 0 on success, <0 on failure.
 671  */
 672 int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *cl)
 673 {
 674         int rets, err;
 675         long timeout = 15;      /* 15 seconds */
 676         struct mei_cl_cb *cb;
 677
 678         if (!dev || !cl)
 679                 return -ENODEV;
 680
 681         if (cl->state != MEI_FILE_DISCONNECTING)
 682                 return 0;
 683
 684         cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
 685         if (!cb)
 686                 return -ENOMEM;
 687
 688         INIT_LIST_HEAD(&cb->cb_list);
 689         cb->file_private = cl;
 690         cb->major_file_operations = MEI_CLOSE;
 691         if (dev->mei_host_buffer_is_empty) {
 692                 dev->mei_host_buffer_is_empty = false;
 693                 if (mei_disconnect(dev, cl)) {
 694                         rets = -ENODEV;
 695                         dev_dbg(&dev->pdev->dev, "failed to call mei_disconnect.\n");
 696                         goto free;
 697                 }
 698                 mdelay(10); /* Wait for hardware disconnection ready */
 699                 list_add_tail(&cb->cb_list, &dev->ctrl_rd_list.mei_cb.cb_list);
 700         } else {
 701                 dev_dbg(&dev->pdev->dev, "add disconnect cb to control write list\n");
 702                 list_add_tail(&cb->cb_list,
 703                                 &dev->ctrl_wr_list.mei_cb.cb_list);
 704         }
 705         mutex_unlock(&dev->device_lock);
 706
 707         err = wait_event_timeout(dev->wait_recvd_msg,
 708                  (MEI_FILE_DISCONNECTED == cl->state),
 709                  timeout * HZ);
 710
 711         mutex_lock(&dev->device_lock);
 712         if (MEI_FILE_DISCONNECTED == cl->state) {
 713                 rets = 0;
 714                 dev_dbg(&dev->pdev->dev, "successfully disconnected from FW client.\n");
 715         } else {
 716                 rets = -ENODEV;
 717                 if (MEI_FILE_DISCONNECTED != cl->state)
 718                         dev_dbg(&dev->pdev->dev, "wrong status client disconnect.\n");
 719
 720                 if (err)
 721                         dev_dbg(&dev->pdev->dev,
 722                                         "wait failed disconnect err=%08x\n",
 723                                         err);
 724
 725                 dev_dbg(&dev->pdev->dev, "failed to disconnect from FW client.\n");
 726         }
 727
 728         mei_io_list_flush(&dev->ctrl_rd_list, cl);
 729         mei_io_list_flush(&dev->ctrl_wr_list, cl);
 730 free:
 731         mei_free_cb_private(cb);
 732         return rets;
 733 }
 734
 735 /**
 736  * mei_remove_client_from_file_list -
 737  *      removes file private data from device file list
 738  *
 739  * @dev: the device structure
 740  * @host_client_id: host client id to be removed
 741  */
 742 void mei_remove_client_from_file_list(struct mei_device *dev,
 743                                        u8 host_client_id)
 744 {
 745         struct mei_cl *cl_pos = NULL;
 746         struct mei_cl *cl_next = NULL;
 747         list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
 748                 if (host_client_id == cl_pos->host_client_id) {
 749                         dev_dbg(&dev->pdev->dev, "remove host client = %d, ME client = %d\n",
 750                                         cl_pos->host_client_id,
 751                                         cl_pos->me_client_id);
 752                         list_del_init(&cl_pos->link);
 753                         break;
 754                 }
 755         }
 756 }