drivers/staging/mei/init.c

   1 /*
   2  *
   3  * Intel Management Engine Interface (Intel MEI) Linux driver
   4  * Copyright (c) 2003-2011, 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 "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_initialize_list - Sets up a queue list.
  33  *
  34  * @list: An instance of our list structure
  35  * @dev: the device structure
  36  */
  37 void mei_initialize_list(struct mei_io_list *list, struct mei_device *dev)
  38 {
  39         /* initialize our queue list */
  40         INIT_LIST_HEAD(&list->mei_cb.cb_list);
  41         list->status = 0;
  42         list->device_extension = dev;
  43 }
  44
  45 /**
  46  * mei_flush_queues - flushes queue lists belonging to cl.
  47  *
  48  * @dev: the device structure
  49  * @cl: private data of the file object
  50  */
  51 void mei_flush_queues(struct mei_device *dev, struct mei_cl *cl)
  52 {
  53         int i;
  54
  55         if (!dev || !cl)
  56                 return;
  57
  58         for (i = 0; i < MEI_IO_LISTS_NUMBER; i++) {
  59                 dev_dbg(&dev->pdev->dev, "remove list entry belonging to cl\n");
  60                 mei_flush_list(dev->io_list_array[i], cl);
  61         }
  62 }
  63
  64
  65 /**
  66  * mei_flush_list - removes list entry belonging to cl.
  67  *
  68  * @list:  An instance of our list structure
  69  * @cl: private data of the file object
  70  */
  71 void mei_flush_list(struct mei_io_list *list, struct mei_cl *cl)
  72 {
  73         struct mei_cl *cl_tmp;
  74         struct mei_cl_cb *cb_pos = NULL;
  75         struct mei_cl_cb *cb_next = NULL;
  76
  77         if (!list || !cl)
  78                 return;
  79
  80         if (list->status != 0)
  81                 return;
  82
  83         if (list_empty(&list->mei_cb.cb_list))
  84                 return;
  85
  86         list_for_each_entry_safe(cb_pos, cb_next,
  87                                  &list->mei_cb.cb_list, cb_list) {
  88                 if (cb_pos) {
  89                         cl_tmp = (struct mei_cl *)
  90                                 cb_pos->file_private;
  91                         if (cl_tmp &&
  92                             mei_fe_same_id(cl, cl_tmp))
  93                                 list_del(&cb_pos->cb_list);
  94                 }
  95         }
  96 }
  97
  98 /**
  99  * mei_reset_iamthif_params - initializes mei device iamthif
 100  *
 101  * @dev: the device structure
 102  */
 103 static void mei_reset_iamthif_params(struct mei_device *dev)
 104 {
 105         /* reset iamthif parameters. */
 106         dev->iamthif_current_cb = NULL;
 107         dev->iamthif_msg_buf_size = 0;
 108         dev->iamthif_msg_buf_index = 0;
 109         dev->iamthif_canceled = 0;
 110         dev->iamthif_ioctl = 0;
 111         dev->iamthif_state = MEI_IAMTHIF_IDLE;
 112         dev->iamthif_timer = 0;
 113 }
 114
 115 /**
 116  * init_mei_device - allocates and initializes the mei device structure
 117  *
 118  * @pdev: The pci device structure
 119  *
 120  * returns The mei_device_device pointer on success, NULL on failure.
 121  */
 122 struct mei_device *init_mei_device(struct pci_dev *pdev)
 123 {
 124         int i;
 125         struct mei_device *dev;
 126
 127         dev = kzalloc(sizeof(struct mei_device), GFP_KERNEL);
 128         if (!dev)
 129                 return NULL;
 130
 131         /* setup our list array */
 132         dev->io_list_array[0] = &dev->read_list;
 133         dev->io_list_array[1] = &dev->write_list;
 134         dev->io_list_array[2] = &dev->write_waiting_list;
 135         dev->io_list_array[3] = &dev->ctrl_wr_list;
 136         dev->io_list_array[4] = &dev->ctrl_rd_list;
 137         dev->io_list_array[5] = &dev->amthi_cmd_list;
 138         dev->io_list_array[6] = &dev->amthi_read_complete_list;
 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->mei_state = MEI_INITIALIZING;
 146         dev->iamthif_state = MEI_IAMTHIF_IDLE;
 147         for (i = 0; i < MEI_IO_LISTS_NUMBER; i++)
 148                 mei_initialize_list(dev->io_list_array[i], dev);
 149         dev->pdev = pdev;
 150         return dev;
 151 }
 152
 153 /**
 154  * mei_hw_init - initializes host and fw to start work.
 155  *
 156  * @dev: the device structure
 157  *
 158  * returns 0 on success, <0 on failure.
 159  */
 160 int mei_hw_init(struct mei_device *dev)
 161 {
 162         int err = 0;
 163         int ret;
 164
 165         mutex_lock(&dev->device_lock);
 166
 167         dev->host_hw_state = mei_hcsr_read(dev);
 168         dev->me_hw_state = mei_mecsr_read(dev);
 169         dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, mestate = 0x%08x.\n",
 170             dev->host_hw_state, dev->me_hw_state);
 171
 172         /* acknowledge interrupt and stop interupts */
 173         if ((dev->host_hw_state & H_IS) == H_IS)
 174                 mei_reg_write(dev, H_CSR, dev->host_hw_state);
 175
 176         dev->recvd_msg = 0;
 177         dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
 178
 179         mei_reset(dev, 1);
 180
 181         dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
 182             dev->host_hw_state, dev->me_hw_state);
 183
 184         /* wait for ME to turn on ME_RDY */
 185         if (!dev->recvd_msg) {
 186                 mutex_unlock(&dev->device_lock);
 187                 err = wait_event_interruptible_timeout(dev->wait_recvd_msg,
 188                         dev->recvd_msg, MEI_INTEROP_TIMEOUT);
 189                 mutex_lock(&dev->device_lock);
 190         }
 191
 192         if (err <= 0 && !dev->recvd_msg) {
 193                 dev->mei_state = MEI_DISABLED;
 194                 dev_dbg(&dev->pdev->dev,
 195                         "wait_event_interruptible_timeout failed"
 196                         "on wait for ME to turn on ME_RDY.\n");
 197                 ret = -ENODEV;
 198                 goto out;
 199         }
 200
 201         if (!(((dev->host_hw_state & H_RDY) == H_RDY) &&
 202               ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA))) {
 203                 dev->mei_state = MEI_DISABLED;
 204                 dev_dbg(&dev->pdev->dev,
 205                         "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
 206                         dev->host_hw_state, dev->me_hw_state);
 207
 208                 if (!(dev->host_hw_state & H_RDY))
 209                         dev_dbg(&dev->pdev->dev, "host turn off H_RDY.\n");
 210
 211                 if (!(dev->me_hw_state & ME_RDY_HRA))
 212                         dev_dbg(&dev->pdev->dev, "ME turn off ME_RDY.\n");
 213
 214                 printk(KERN_ERR "mei: link layer initialization failed.\n");
 215                 ret = -ENODEV;
 216                 goto out;
 217         }
 218
 219         if (dev->version.major_version != HBM_MAJOR_VERSION ||
 220             dev->version.minor_version != HBM_MINOR_VERSION) {
 221                 dev_dbg(&dev->pdev->dev, "MEI start failed.\n");
 222                 ret = -ENODEV;
 223                 goto out;
 224         }
 225
 226         dev->recvd_msg = 0;
 227         dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
 228             dev->host_hw_state, dev->me_hw_state);
 229         dev_dbg(&dev->pdev->dev, "ME turn on ME_RDY and host turn on H_RDY.\n");
 230         dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
 231         dev_dbg(&dev->pdev->dev, "MEI  start success.\n");
 232         ret = 0;
 233
 234 out:
 235         mutex_unlock(&dev->device_lock);
 236         return ret;
 237 }
 238
 239 /**
 240  * mei_hw_reset - resets fw via mei csr register.
 241  *
 242  * @dev: the device structure
 243  * @interrupts_enabled: if interrupt should be enabled after reset.
 244  */
 245 static void mei_hw_reset(struct mei_device *dev, int interrupts_enabled)
 246 {
 247         dev->host_hw_state |= (H_RST | H_IG);
 248
 249         if (interrupts_enabled)
 250                 mei_enable_interrupts(dev);
 251         else
 252                 mei_disable_interrupts(dev);
 253 }
 254
 255 /**
 256  * mei_reset - resets host and fw.
 257  *
 258  * @dev: the device structure
 259  * @interrupts_enabled: if interrupt should be enabled after reset.
 260  */
 261 void mei_reset(struct mei_device *dev, int interrupts_enabled)
 262 {
 263         struct mei_cl *cl_pos = NULL;
 264         struct mei_cl *cl_next = NULL;
 265         struct mei_cl_cb *cb_pos = NULL;
 266         struct mei_cl_cb *cb_next = NULL;
 267         bool unexpected;
 268
 269         if (dev->mei_state == MEI_RECOVERING_FROM_RESET) {
 270                 dev->need_reset = 1;
 271                 return;
 272         }
 273
 274         unexpected = (dev->mei_state != MEI_INITIALIZING &&
 275                         dev->mei_state != MEI_DISABLED &&
 276                         dev->mei_state != MEI_POWER_DOWN &&
 277                         dev->mei_state != MEI_POWER_UP);
 278
 279         dev->host_hw_state = mei_hcsr_read(dev);
 280
 281         dev_dbg(&dev->pdev->dev, "before reset host_hw_state = 0x%08x.\n",
 282             dev->host_hw_state);
 283
 284         mei_hw_reset(dev, interrupts_enabled);
 285
 286         dev->host_hw_state &= ~H_RST;
 287         dev->host_hw_state |= H_IG;
 288
 289         mei_hcsr_set(dev);
 290
 291         dev_dbg(&dev->pdev->dev, "currently saved host_hw_state = 0x%08x.\n",
 292             dev->host_hw_state);
 293
 294         dev->need_reset = 0;
 295
 296         if (dev->mei_state != MEI_INITIALIZING) {
 297                 if (dev->mei_state != MEI_DISABLED &&
 298                     dev->mei_state != MEI_POWER_DOWN)
 299                         dev->mei_state = MEI_RESETING;
 300
 301                 list_for_each_entry_safe(cl_pos,
 302                                 cl_next, &dev->file_list, link) {
 303                         cl_pos->state = MEI_FILE_DISCONNECTED;
 304                         cl_pos->mei_flow_ctrl_creds = 0;
 305                         cl_pos->read_cb = NULL;
 306                         cl_pos->timer_count = 0;
 307                 }
 308                 /* remove entry if already in list */
 309                 dev_dbg(&dev->pdev->dev, "list del iamthif and wd file list.\n");
 310                 mei_remove_client_from_file_list(dev,
 311                                 dev->wd_cl.host_client_id);
 312
 313                 mei_remove_client_from_file_list(dev,
 314                                 dev->iamthif_cl.host_client_id);
 315
 316                 mei_reset_iamthif_params(dev);
 317                 dev->wd_due_counter = 0;
 318                 dev->extra_write_index = 0;
 319         }
 320
 321         dev->num_mei_me_clients = 0;
 322         dev->rd_msg_hdr = 0;
 323         dev->stop = 0;
 324         dev->wd_pending = 0;
 325
 326         /* update the state of the registers after reset */
 327         dev->host_hw_state = mei_hcsr_read(dev);
 328         dev->me_hw_state = mei_mecsr_read(dev);
 329
 330         dev_dbg(&dev->pdev->dev, "after reset host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
 331             dev->host_hw_state, dev->me_hw_state);
 332
 333         if (unexpected)
 334                 dev_warn(&dev->pdev->dev, "unexpected reset.\n");
 335
 336         /* Wake up all readings so they can be interrupted */
 337         list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
 338                 if (waitqueue_active(&cl_pos->rx_wait)) {
 339                         dev_dbg(&dev->pdev->dev, "Waking up client!\n");
 340                         wake_up_interruptible(&cl_pos->rx_wait);
 341                 }
 342         }
 343         /* remove all waiting requests */
 344         if (dev->write_list.status == 0 &&
 345                 !list_empty(&dev->write_list.mei_cb.cb_list)) {
 346                 list_for_each_entry_safe(cb_pos, cb_next,
 347                                 &dev->write_list.mei_cb.cb_list, cb_list) {
 348                         if (cb_pos) {
 349                                 list_del(&cb_pos->cb_list);
 350                                 mei_free_cb_private(cb_pos);
 351                                 cb_pos = NULL;
 352                         }
 353                 }
 354         }
 355 }
 356
 357
 358
 359 /**
 360  * host_start_message - mei host sends start message.
 361  *
 362  * @dev: the device structure
 363  *
 364  * returns none.
 365  */
 366 void host_start_message(struct mei_device *dev)
 367 {
 368         struct mei_msg_hdr *mei_hdr;
 369         struct hbm_host_version_request *host_start_req;
 370
 371         /* host start message */
 372         mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
 373         mei_hdr->host_addr = 0;
 374         mei_hdr->me_addr = 0;
 375         mei_hdr->length = sizeof(struct hbm_host_version_request);
 376         mei_hdr->msg_complete = 1;
 377         mei_hdr->reserved = 0;
 378
 379         host_start_req =
 380             (struct hbm_host_version_request *) &dev->wr_msg_buf[1];
 381         memset(host_start_req, 0, sizeof(struct hbm_host_version_request));
 382         host_start_req->cmd.cmd = HOST_START_REQ_CMD;
 383         host_start_req->host_version.major_version = HBM_MAJOR_VERSION;
 384         host_start_req->host_version.minor_version = HBM_MINOR_VERSION;
 385         dev->recvd_msg = 0;
 386         if (!mei_write_message(dev, mei_hdr,
 387                                        (unsigned char *) (host_start_req),
 388                                        mei_hdr->length)) {
 389                 dev_dbg(&dev->pdev->dev, "write send version message to FW fail.\n");
 390                 dev->mei_state = MEI_RESETING;
 391                 mei_reset(dev, 1);
 392         }
 393         dev->init_clients_state = MEI_START_MESSAGE;
 394         dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
 395         return ;
 396 }
 397
 398 /**
 399  * host_enum_clients_message - host sends enumeration client request message.
 400  *
 401  * @dev: the device structure
 402  *
 403  * returns none.
 404  */
 405 void host_enum_clients_message(struct mei_device *dev)
 406 {
 407         struct mei_msg_hdr *mei_hdr;
 408         struct hbm_host_enum_request *host_enum_req;
 409         mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
 410         /* enumerate clients */
 411         mei_hdr->host_addr = 0;
 412         mei_hdr->me_addr = 0;
 413         mei_hdr->length = sizeof(struct hbm_host_enum_request);
 414         mei_hdr->msg_complete = 1;
 415         mei_hdr->reserved = 0;
 416
 417         host_enum_req = (struct hbm_host_enum_request *) &dev->wr_msg_buf[1];
 418         memset(host_enum_req, 0, sizeof(struct hbm_host_enum_request));
 419         host_enum_req->cmd.cmd = HOST_ENUM_REQ_CMD;
 420         if (!mei_write_message(dev, mei_hdr,
 421                                (unsigned char *) (host_enum_req),
 422                                 mei_hdr->length)) {
 423                 dev->mei_state = MEI_RESETING;
 424                 dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
 425                 mei_reset(dev, 1);
 426         }
 427         dev->init_clients_state = MEI_ENUM_CLIENTS_MESSAGE;
 428         dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
 429         return ;
 430 }
 431
 432
 433 /**
 434  * allocate_me_clients_storage - allocates storage for me clients
 435  *
 436  * @dev: the device structure
 437  *
 438  * returns none.
 439  */
 440 void allocate_me_clients_storage(struct mei_device *dev)
 441 {
 442         struct mei_me_client *clients;
 443         int b;
 444
 445         /* count how many ME clients we have */
 446         for_each_set_bit(b, dev->me_clients_map, MEI_CLIENTS_MAX)
 447                 dev->num_mei_me_clients++;
 448
 449         if (dev->num_mei_me_clients <= 0)
 450                 return ;
 451
 452
 453         if (dev->me_clients != NULL) {
 454                 kfree(dev->me_clients);
 455                 dev->me_clients = NULL;
 456         }
 457         dev_dbg(&dev->pdev->dev, "memory allocation for ME clients size=%zd.\n",
 458                 dev->num_mei_me_clients * sizeof(struct mei_me_client));
 459         /* allocate storage for ME clients representation */
 460         clients = kcalloc(dev->num_mei_me_clients,
 461                         sizeof(struct mei_me_client), GFP_KERNEL);
 462         if (!clients) {
 463                 dev_dbg(&dev->pdev->dev, "memory allocation for ME clients failed.\n");
 464                 dev->mei_state = MEI_RESETING;
 465                 mei_reset(dev, 1);
 466                 return ;
 467         }
 468         dev->me_clients = clients;
 469         return ;
 470 }
 471 /**
 472  * host_client_properties - reads properties for client
 473  *
 474  * @dev: the device structure
 475  *
 476  * returns none.
 477  */
 478 void host_client_properties(struct mei_device *dev)
 479 {
 480         struct mei_msg_hdr *mei_header;
 481         struct hbm_props_request *host_cli_req;
 482         int b;
 483         u8 client_num = dev->me_client_presentation_num;
 484
 485         b = dev->me_client_index;
 486         b = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, b);
 487         if (b < MEI_CLIENTS_MAX) {
 488                 dev->me_clients[client_num].client_id = b;
 489                 dev->me_clients[client_num].mei_flow_ctrl_creds = 0;
 490                 mei_header = (struct mei_msg_hdr *)&dev->wr_msg_buf[0];
 491                 mei_header->host_addr = 0;
 492                 mei_header->me_addr = 0;
 493                 mei_header->length = sizeof(struct hbm_props_request);
 494                 mei_header->msg_complete = 1;
 495                 mei_header->reserved = 0;
 496
 497                 host_cli_req = (struct hbm_props_request *)&dev->wr_msg_buf[1];
 498
 499                 memset(host_cli_req, 0, sizeof(struct hbm_props_request));
 500
 501                 host_cli_req->cmd.cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
 502                 host_cli_req->address = b;
 503
 504                 if (!mei_write_message(dev, mei_header,
 505                                 (unsigned char *)host_cli_req,
 506                                 mei_header->length)) {
 507                         dev->mei_state = MEI_RESETING;
 508                         dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
 509                         mei_reset(dev, 1);
 510                         return;
 511                 }
 512
 513                 dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
 514                 dev->me_client_index = b;
 515                 return;
 516         }
 517
 518
 519         /*
 520          * Clear Map for indicating now ME clients
 521          * with associated host client
 522          */
 523         bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
 524         dev->write_hang = -1;
 525         dev->open_handle_count = 0;
 526         bitmap_set(dev->host_clients_map, 0, 3);
 527         dev->mei_state = MEI_ENABLED;
 528
 529         mei_wd_host_init(dev);
 530         return;
 531 }
 532
 533 /**
 534  * mei_init_file_private - initializes private file structure.
 535  *
 536  * @priv: private file structure to be initialized
 537  * @file: the file structure
 538  */
 539 void mei_init_file_private(struct mei_cl *priv, struct mei_device *dev)
 540 {
 541         memset(priv, 0, sizeof(struct mei_cl));
 542         init_waitqueue_head(&priv->wait);
 543         init_waitqueue_head(&priv->rx_wait);
 544         init_waitqueue_head(&priv->tx_wait);
 545         INIT_LIST_HEAD(&priv->link);
 546         priv->reading_state = MEI_IDLE;
 547         priv->writing_state = MEI_IDLE;
 548         priv->dev = dev;
 549 }
 550
 551 int mei_find_me_client_index(const struct mei_device *dev, uuid_le cuuid)
 552 {
 553         int i, res = -1;
 554
 555         for (i = 0; i < dev->num_mei_me_clients; ++i)
 556                 if (uuid_le_cmp(cuuid,
 557                                 dev->me_clients[i].props.protocol_name) == 0) {
 558                         res = i;
 559                         break;
 560                 }
 561
 562         return res;
 563 }
 564
 565
 566 /**
 567  * mei_find_me_client_update_filext - searches for ME client guid
 568  *                       sets client_id in mei_file_private if found
 569  * @dev: the device structure
 570  * @priv: private file structure to set client_id in
 571  * @cguid: searched guid of ME client
 572  * @client_id: id of host client to be set in file private structure
 573  *
 574  * returns ME client index
 575  */
 576 u8 mei_find_me_client_update_filext(struct mei_device *dev, struct mei_cl *priv,
 577                                 const uuid_le *cguid, u8 client_id)
 578 {
 579         int i;
 580
 581         if (!dev || !priv || !cguid)
 582                 return 0;
 583
 584         /* check for valid client id */
 585         i = mei_find_me_client_index(dev, *cguid);
 586         if (i >= 0) {
 587                 priv->me_client_id = dev->me_clients[i].client_id;
 588                 priv->state = MEI_FILE_CONNECTING;
 589                 priv->host_client_id = client_id;
 590
 591                 list_add_tail(&priv->link, &dev->file_list);
 592                 return (u8)i;
 593         }
 594
 595         return 0;
 596 }
 597
 598 /**
 599  * host_init_iamthif - mei initialization iamthif client.
 600  *
 601  * @dev: the device structure
 602  *
 603  */
 604 void host_init_iamthif(struct mei_device *dev)
 605 {
 606         u8 i;
 607         unsigned char *msg_buf;
 608
 609         mei_init_file_private(&dev->iamthif_cl, dev);
 610         dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
 611
 612         /* find ME amthi client */
 613         i = mei_find_me_client_update_filext(dev, &dev->iamthif_cl,
 614                             &mei_amthi_guid, MEI_IAMTHIF_HOST_CLIENT_ID);
 615         if (dev->iamthif_cl.state != MEI_FILE_CONNECTING) {
 616                 dev_dbg(&dev->pdev->dev, "failed to find iamthif client.\n");
 617                 return;
 618         }
 619
 620         /* Do not render the system unusable when iamthif_mtu is not equal to
 621         the value received from ME.
 622         Assign iamthif_mtu to the value received from ME in order to solve the
 623         hardware macro incompatibility. */
 624
 625         dev_dbg(&dev->pdev->dev, "[DEFAULT] IAMTHIF = %d\n", dev->iamthif_mtu);
 626         dev->iamthif_mtu = dev->me_clients[i].props.max_msg_length;
 627         dev_dbg(&dev->pdev->dev,
 628                         "IAMTHIF = %d\n",
 629                         dev->me_clients[i].props.max_msg_length);
 630
 631         kfree(dev->iamthif_msg_buf);
 632         dev->iamthif_msg_buf = NULL;
 633
 634         /* allocate storage for ME message buffer */
 635         msg_buf = kcalloc(dev->iamthif_mtu,
 636                         sizeof(unsigned char), GFP_KERNEL);
 637         if (!msg_buf) {
 638                 dev_dbg(&dev->pdev->dev, "memory allocation for ME message buffer failed.\n");
 639                 return;
 640         }
 641
 642         dev->iamthif_msg_buf = msg_buf;
 643
 644         if (!mei_connect(dev, &dev->iamthif_cl)) {
 645                 dev_dbg(&dev->pdev->dev, "Failed to connect to AMTHI client\n");
 646                 dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
 647                 dev->iamthif_cl.host_client_id = 0;
 648         } else {
 649                 dev->iamthif_cl.timer_count = CONNECT_TIMEOUT;
 650         }
 651 }
 652
 653 /**
 654  * mei_alloc_file_private - allocates a private file structure and sets it up.
 655  * @file: the file structure
 656  *
 657  * returns  The allocated file or NULL on failure
 658  */
 659 struct mei_cl *mei_alloc_file_private(struct mei_device *dev)
 660 {
 661         struct mei_cl *priv;
 662
 663         priv = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
 664         if (!priv)
 665                 return NULL;
 666
 667         mei_init_file_private(priv, dev);
 668
 669         return priv;
 670 }
 671
 672
 673
 674 /**
 675  * mei_disconnect_host_client - sends disconnect message to fw from host client.
 676  *
 677  * @dev: the device structure
 678  * @cl: private data of the file object
 679  *
 680  * Locking: called under "dev->device_lock" lock
 681  *
 682  * returns 0 on success, <0 on failure.
 683  */
 684 int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *cl)
 685 {
 686         int rets, err;
 687         long timeout = 15;      /* 15 seconds */
 688         struct mei_cl_cb *cb;
 689
 690         if (!dev || !cl)
 691                 return -ENODEV;
 692
 693         if (cl->state != MEI_FILE_DISCONNECTING)
 694                 return 0;
 695
 696         cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
 697         if (!cb)
 698                 return -ENOMEM;
 699
 700         INIT_LIST_HEAD(&cb->cb_list);
 701         cb->file_private = cl;
 702         cb->major_file_operations = MEI_CLOSE;
 703         if (dev->mei_host_buffer_is_empty) {
 704                 dev->mei_host_buffer_is_empty = 0;
 705                 if (mei_disconnect(dev, cl)) {
 706                         mdelay(10); /* Wait for hardware disconnection ready */
 707                         list_add_tail(&cb->cb_list,
 708                                 &dev->ctrl_rd_list.mei_cb.cb_list);
 709                 } else {
 710                         rets = -ENODEV;
 711                         dev_dbg(&dev->pdev->dev, "failed to call mei_disconnect.\n");
 712                         goto free;
 713                 }
 714         } else {
 715                 dev_dbg(&dev->pdev->dev, "add disconnect cb to control write list\n");
 716                 list_add_tail(&cb->cb_list,
 717                                 &dev->ctrl_wr_list.mei_cb.cb_list);
 718         }
 719         mutex_unlock(&dev->device_lock);
 720
 721         err = wait_event_timeout(dev->wait_recvd_msg,
 722                  (MEI_FILE_DISCONNECTED == cl->state),
 723                  timeout * HZ);
 724
 725         mutex_lock(&dev->device_lock);
 726         if (MEI_FILE_DISCONNECTED == cl->state) {
 727                 rets = 0;
 728                 dev_dbg(&dev->pdev->dev, "successfully disconnected from FW client.\n");
 729         } else {
 730                 rets = -ENODEV;
 731                 if (MEI_FILE_DISCONNECTED != cl->state)
 732                         dev_dbg(&dev->pdev->dev, "wrong status client disconnect.\n");
 733
 734                 if (err)
 735                         dev_dbg(&dev->pdev->dev,
 736                                         "wait failed disconnect err=%08x\n",
 737                                         err);
 738
 739                 dev_dbg(&dev->pdev->dev, "failed to disconnect from FW client.\n");
 740         }
 741
 742         mei_flush_list(&dev->ctrl_rd_list, cl);
 743         mei_flush_list(&dev->ctrl_wr_list, cl);
 744 free:
 745         mei_free_cb_private(cb);
 746         return rets;
 747 }
 748
 749 /**
 750  * mei_remove_client_from_file_list -
 751  *      removes file private data from device file list
 752  *
 753  * @dev: the device structure
 754  * @host_client_id: host client id to be removed
 755  */
 756 void mei_remove_client_from_file_list(struct mei_device *dev,
 757                                        u8 host_client_id)
 758 {
 759         struct mei_cl *cl_pos = NULL;
 760         struct mei_cl *cl_next = NULL;
 761         list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
 762                 if (host_client_id == cl_pos->host_client_id) {
 763                         dev_dbg(&dev->pdev->dev, "remove host client = %d, ME client = %d\n",
 764                                         cl_pos->host_client_id,
 765                                         cl_pos->me_client_id);
 766                         list_del_init(&cl_pos->link);
 767                         break;
 768                 }
 769         }
 770 }