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