drivers/misc/mei/interrupt.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
  18 #include <linux/pci.h>
  19 #include <linux/kthread.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/fs.h>
  22 #include <linux/jiffies.h>
  23
  24 #include "mei_dev.h"
  25 #include <linux/mei.h>
  26 #include "hw.h"
  27 #include "interface.h"
  28
  29
  30 /**
  31  * mei_interrupt_quick_handler - The ISR of the MEI device
  32  *
  33  * @irq: The irq number
  34  * @dev_id: pointer to the device structure
  35  *
  36  * returns irqreturn_t
  37  */
  38 irqreturn_t mei_interrupt_quick_handler(int irq, void *dev_id)
  39 {
  40         struct mei_device *dev = (struct mei_device *) dev_id;
  41         u32 csr_reg = mei_hcsr_read(dev);
  42
  43         if ((csr_reg & H_IS) != H_IS)
  44                 return IRQ_NONE;
  45
  46         /* clear H_IS bit in H_CSR */
  47         mei_reg_write(dev, H_CSR, csr_reg);
  48
  49         return IRQ_WAKE_THREAD;
  50 }
  51
  52 /**
  53  * _mei_cmpl - processes completed operation.
  54  *
  55  * @cl: private data of the file object.
  56  * @cb_pos: callback block.
  57  */
  58 static void _mei_cmpl(struct mei_cl *cl, struct mei_cl_cb *cb_pos)
  59 {
  60         if (cb_pos->major_file_operations == MEI_WRITE) {
  61                 mei_free_cb_private(cb_pos);
  62                 cb_pos = NULL;
  63                 cl->writing_state = MEI_WRITE_COMPLETE;
  64                 if (waitqueue_active(&cl->tx_wait))
  65                         wake_up_interruptible(&cl->tx_wait);
  66
  67         } else if (cb_pos->major_file_operations == MEI_READ &&
  68                         MEI_READING == cl->reading_state) {
  69                 cl->reading_state = MEI_READ_COMPLETE;
  70                 if (waitqueue_active(&cl->rx_wait))
  71                         wake_up_interruptible(&cl->rx_wait);
  72
  73         }
  74 }
  75
  76 /**
  77  * _mei_cmpl_iamthif - processes completed iamthif operation.
  78  *
  79  * @dev: the device structure.
  80  * @cb_pos: callback block.
  81  */
  82 static void _mei_cmpl_iamthif(struct mei_device *dev, struct mei_cl_cb *cb_pos)
  83 {
  84         if (dev->iamthif_canceled != 1) {
  85                 dev->iamthif_state = MEI_IAMTHIF_READ_COMPLETE;
  86                 dev->iamthif_stall_timer = 0;
  87                 memcpy(cb_pos->response_buffer.data,
  88                                 dev->iamthif_msg_buf,
  89                                 dev->iamthif_msg_buf_index);
  90                 list_add_tail(&cb_pos->list, &dev->amthi_read_complete_list.list);
  91                 dev_dbg(&dev->pdev->dev, "amthi read completed\n");
  92                 dev->iamthif_timer = jiffies;
  93                 dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
  94                                 dev->iamthif_timer);
  95         } else {
  96                 mei_run_next_iamthif_cmd(dev);
  97         }
  98
  99         dev_dbg(&dev->pdev->dev, "completing amthi call back.\n");
 100         wake_up_interruptible(&dev->iamthif_cl.wait);
 101 }
 102
 103
 104 /**
 105  * mei_irq_thread_read_amthi_message - bottom half read routine after ISR to
 106  * handle the read amthi message data processing.
 107  *
 108  * @complete_list: An instance of our list structure
 109  * @dev: the device structure
 110  * @mei_hdr: header of amthi message
 111  *
 112  * returns 0 on success, <0 on failure.
 113  */
 114 static int mei_irq_thread_read_amthi_message(struct mei_cl_cb *complete_list,
 115                 struct mei_device *dev,
 116                 struct mei_msg_hdr *mei_hdr)
 117 {
 118         struct mei_cl *cl;
 119         struct mei_cl_cb *cb;
 120         unsigned char *buffer;
 121
 122         BUG_ON(mei_hdr->me_addr != dev->iamthif_cl.me_client_id);
 123         BUG_ON(dev->iamthif_state != MEI_IAMTHIF_READING);
 124
 125         buffer = dev->iamthif_msg_buf + dev->iamthif_msg_buf_index;
 126         BUG_ON(dev->iamthif_mtu < dev->iamthif_msg_buf_index + mei_hdr->length);
 127
 128         mei_read_slots(dev, buffer, mei_hdr->length);
 129
 130         dev->iamthif_msg_buf_index += mei_hdr->length;
 131
 132         if (!mei_hdr->msg_complete)
 133                 return 0;
 134
 135         dev_dbg(&dev->pdev->dev,
 136                         "amthi_message_buffer_index =%d\n",
 137                         mei_hdr->length);
 138
 139         dev_dbg(&dev->pdev->dev, "completed amthi read.\n ");
 140         if (!dev->iamthif_current_cb)
 141                 return -ENODEV;
 142
 143         cb = dev->iamthif_current_cb;
 144         dev->iamthif_current_cb = NULL;
 145
 146         cl = (struct mei_cl *)cb->file_private;
 147         if (!cl)
 148                 return -ENODEV;
 149
 150         dev->iamthif_stall_timer = 0;
 151         cb->buf_idx = dev->iamthif_msg_buf_index;
 152         cb->read_time = jiffies;
 153         if (dev->iamthif_ioctl && cl == &dev->iamthif_cl) {
 154                 /* found the iamthif cb */
 155                 dev_dbg(&dev->pdev->dev, "complete the amthi read cb.\n ");
 156                 dev_dbg(&dev->pdev->dev, "add the amthi read cb to complete.\n ");
 157                 list_add_tail(&cb->list, &complete_list->list);
 158         }
 159         return 0;
 160 }
 161
 162 /**
 163  * _mei_irq_thread_state_ok - checks if mei header matches file private data
 164  *
 165  * @cl: private data of the file object
 166  * @mei_hdr: header of mei client message
 167  *
 168  * returns !=0 if matches, 0 if no match.
 169  */
 170 static int _mei_irq_thread_state_ok(struct mei_cl *cl,
 171                                 struct mei_msg_hdr *mei_hdr)
 172 {
 173         return (cl->host_client_id == mei_hdr->host_addr &&
 174                 cl->me_client_id == mei_hdr->me_addr &&
 175                 cl->state == MEI_FILE_CONNECTED &&
 176                 MEI_READ_COMPLETE != cl->reading_state);
 177 }
 178
 179 /**
 180  * mei_irq_thread_read_client_message - bottom half read routine after ISR to
 181  * handle the read mei client message data processing.
 182  *
 183  * @complete_list: An instance of our list structure
 184  * @dev: the device structure
 185  * @mei_hdr: header of mei client message
 186  *
 187  * returns 0 on success, <0 on failure.
 188  */
 189 static int mei_irq_thread_read_client_message(struct mei_cl_cb *complete_list,
 190                 struct mei_device *dev,
 191                 struct mei_msg_hdr *mei_hdr)
 192 {
 193         struct mei_cl *cl;
 194         struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
 195         unsigned char *buffer = NULL;
 196
 197         dev_dbg(&dev->pdev->dev, "start client msg\n");
 198         if (list_empty(&dev->read_list.list))
 199                 goto quit;
 200
 201         list_for_each_entry_safe(cb_pos, cb_next, &dev->read_list.list, list) {
 202                 cl = (struct mei_cl *)cb_pos->file_private;
 203                 if (cl && _mei_irq_thread_state_ok(cl, mei_hdr)) {
 204                         cl->reading_state = MEI_READING;
 205                         buffer = cb_pos->response_buffer.data + cb_pos->buf_idx;
 206
 207                         if (cb_pos->response_buffer.size <
 208                                         mei_hdr->length + cb_pos->buf_idx) {
 209                                 dev_dbg(&dev->pdev->dev, "message overflow.\n");
 210                                 list_del(&cb_pos->list);
 211                                 return -ENOMEM;
 212                         }
 213                         if (buffer)
 214                                 mei_read_slots(dev, buffer, mei_hdr->length);
 215
 216                         cb_pos->buf_idx += mei_hdr->length;
 217                         if (mei_hdr->msg_complete) {
 218                                 cl->status = 0;
 219                                 list_del(&cb_pos->list);
 220                                 dev_dbg(&dev->pdev->dev,
 221                                         "completed read H cl = %d, ME cl = %d, length = %lu\n",
 222                                         cl->host_client_id,
 223                                         cl->me_client_id,
 224                                         cb_pos->buf_idx);
 225
 226                                 list_add_tail(&cb_pos->list,
 227                                                 &complete_list->list);
 228                         }
 229
 230                         break;
 231                 }
 232
 233         }
 234
 235 quit:
 236         dev_dbg(&dev->pdev->dev, "message read\n");
 237         if (!buffer) {
 238                 mei_read_slots(dev, dev->rd_msg_buf, mei_hdr->length);
 239                 dev_dbg(&dev->pdev->dev, "discarding message, header =%08x.\n",
 240                                 *(u32 *) dev->rd_msg_buf);
 241         }
 242
 243         return 0;
 244 }
 245
 246 /**
 247  * _mei_irq_thread_iamthif_read - prepares to read iamthif data.
 248  *
 249  * @dev: the device structure.
 250  * @slots: free slots.
 251  *
 252  * returns 0, OK; otherwise, error.
 253  */
 254 static int _mei_irq_thread_iamthif_read(struct mei_device *dev, s32 *slots)
 255 {
 256
 257         if (((*slots) * sizeof(u32)) < (sizeof(struct mei_msg_hdr)
 258                         + sizeof(struct hbm_flow_control))) {
 259                 return -EMSGSIZE;
 260         }
 261         *slots -= mei_data2slots(sizeof(struct hbm_flow_control));
 262         if (mei_send_flow_control(dev, &dev->iamthif_cl)) {
 263                 dev_dbg(&dev->pdev->dev, "iamthif flow control failed\n");
 264                 return -EIO;
 265         }
 266
 267         dev_dbg(&dev->pdev->dev, "iamthif flow control success\n");
 268         dev->iamthif_state = MEI_IAMTHIF_READING;
 269         dev->iamthif_flow_control_pending = false;
 270         dev->iamthif_msg_buf_index = 0;
 271         dev->iamthif_msg_buf_size = 0;
 272         dev->iamthif_stall_timer = IAMTHIF_STALL_TIMER;
 273         dev->mei_host_buffer_is_empty = mei_hbuf_is_empty(dev);
 274         return 0;
 275 }
 276
 277 /**
 278  * _mei_irq_thread_close - processes close related operation.
 279  *
 280  * @dev: the device structure.
 281  * @slots: free slots.
 282  * @cb_pos: callback block.
 283  * @cl: private data of the file object.
 284  * @cmpl_list: complete list.
 285  *
 286  * returns 0, OK; otherwise, error.
 287  */
 288 static int _mei_irq_thread_close(struct mei_device *dev, s32 *slots,
 289                                 struct mei_cl_cb *cb_pos,
 290                                 struct mei_cl *cl,
 291                                 struct mei_cl_cb *cmpl_list)
 292 {
 293         if ((*slots * sizeof(u32)) < (sizeof(struct mei_msg_hdr) +
 294                         sizeof(struct hbm_client_disconnect_request)))
 295                 return -EBADMSG;
 296
 297         *slots -= mei_data2slots(sizeof(struct hbm_client_disconnect_request));
 298
 299         if (mei_disconnect(dev, cl)) {
 300                 cl->status = 0;
 301                 cb_pos->buf_idx = 0;
 302                 list_move_tail(&cb_pos->list, &cmpl_list->list);
 303                 return -EMSGSIZE;
 304         } else {
 305                 cl->state = MEI_FILE_DISCONNECTING;
 306                 cl->status = 0;
 307                 cb_pos->buf_idx = 0;
 308                 list_move_tail(&cb_pos->list, &dev->ctrl_rd_list.list);
 309                 cl->timer_count = MEI_CONNECT_TIMEOUT;
 310         }
 311
 312         return 0;
 313 }
 314
 315 /**
 316  * is_treat_specially_client - checks if the message belongs
 317  * to the file private data.
 318  *
 319  * @cl: private data of the file object
 320  * @rs: connect response bus message
 321  *
 322  */
 323 static bool is_treat_specially_client(struct mei_cl *cl,
 324                 struct hbm_client_connect_response *rs)
 325 {
 326
 327         if (cl->host_client_id == rs->host_addr &&
 328             cl->me_client_id == rs->me_addr) {
 329                 if (!rs->status) {
 330                         cl->state = MEI_FILE_CONNECTED;
 331                         cl->status = 0;
 332
 333                 } else {
 334                         cl->state = MEI_FILE_DISCONNECTED;
 335                         cl->status = -ENODEV;
 336                 }
 337                 cl->timer_count = 0;
 338
 339                 return true;
 340         }
 341         return false;
 342 }
 343
 344 /**
 345  * mei_client_connect_response - connects to response irq routine
 346  *
 347  * @dev: the device structure
 348  * @rs: connect response bus message
 349  */
 350 static void mei_client_connect_response(struct mei_device *dev,
 351                 struct hbm_client_connect_response *rs)
 352 {
 353
 354         struct mei_cl *cl;
 355         struct mei_cl_cb *pos = NULL, *next = NULL;
 356
 357         dev_dbg(&dev->pdev->dev,
 358                         "connect_response:\n"
 359                         "ME Client = %d\n"
 360                         "Host Client = %d\n"
 361                         "Status = %d\n",
 362                         rs->me_addr,
 363                         rs->host_addr,
 364                         rs->status);
 365
 366         /* if WD or iamthif client treat specially */
 367
 368         if (is_treat_specially_client(&(dev->wd_cl), rs)) {
 369                 dev_dbg(&dev->pdev->dev, "successfully connected to WD client.\n");
 370                 mei_watchdog_register(dev);
 371
 372                 /* next step in the state maching */
 373                 mei_host_init_iamthif(dev);
 374                 return;
 375         }
 376
 377         if (is_treat_specially_client(&(dev->iamthif_cl), rs)) {
 378                 dev->iamthif_state = MEI_IAMTHIF_IDLE;
 379                 return;
 380         }
 381         list_for_each_entry_safe(pos, next, &dev->ctrl_rd_list.list, list) {
 382
 383                 cl = (struct mei_cl *)pos->file_private;
 384                 if (!cl) {
 385                         list_del(&pos->list);
 386                         return;
 387                 }
 388                 if (MEI_IOCTL == pos->major_file_operations) {
 389                         if (is_treat_specially_client(cl, rs)) {
 390                                 list_del(&pos->list);
 391                                 cl->status = 0;
 392                                 cl->timer_count = 0;
 393                                 break;
 394                         }
 395                 }
 396         }
 397 }
 398
 399 /**
 400  * mei_client_disconnect_response - disconnects from response irq routine
 401  *
 402  * @dev: the device structure
 403  * @rs: disconnect response bus message
 404  */
 405 static void mei_client_disconnect_response(struct mei_device *dev,
 406                                         struct hbm_client_connect_response *rs)
 407 {
 408         struct mei_cl *cl;
 409         struct mei_cl_cb *pos = NULL, *next = NULL;
 410
 411         dev_dbg(&dev->pdev->dev,
 412                         "disconnect_response:\n"
 413                         "ME Client = %d\n"
 414                         "Host Client = %d\n"
 415                         "Status = %d\n",
 416                         rs->me_addr,
 417                         rs->host_addr,
 418                         rs->status);
 419
 420         list_for_each_entry_safe(pos, next, &dev->ctrl_rd_list.list, list) {
 421                 cl = (struct mei_cl *)pos->file_private;
 422
 423                 if (!cl) {
 424                         list_del(&pos->list);
 425                         return;
 426                 }
 427
 428                 dev_dbg(&dev->pdev->dev, "list_for_each_entry_safe in ctrl_rd_list.\n");
 429                 if (cl->host_client_id == rs->host_addr &&
 430                     cl->me_client_id == rs->me_addr) {
 431
 432                         list_del(&pos->list);
 433                         if (!rs->status)
 434                                 cl->state = MEI_FILE_DISCONNECTED;
 435
 436                         cl->status = 0;
 437                         cl->timer_count = 0;
 438                         break;
 439                 }
 440         }
 441 }
 442
 443 /**
 444  * same_flow_addr - tells if they have the same address.
 445  *
 446  * @file: private data of the file object.
 447  * @flow: flow control.
 448  *
 449  * returns  !=0, same; 0,not.
 450  */
 451 static int same_flow_addr(struct mei_cl *cl, struct hbm_flow_control *flow)
 452 {
 453         return (cl->host_client_id == flow->host_addr &&
 454                 cl->me_client_id == flow->me_addr);
 455 }
 456
 457 /**
 458  * add_single_flow_creds - adds single buffer credentials.
 459  *
 460  * @file: private data ot the file object.
 461  * @flow: flow control.
 462  */
 463 static void add_single_flow_creds(struct mei_device *dev,
 464                                   struct hbm_flow_control *flow)
 465 {
 466         struct mei_me_client *client;
 467         int i;
 468
 469         for (i = 0; i < dev->me_clients_num; i++) {
 470                 client = &dev->me_clients[i];
 471                 if (client && flow->me_addr == client->client_id) {
 472                         if (client->props.single_recv_buf) {
 473                                 client->mei_flow_ctrl_creds++;
 474                                 dev_dbg(&dev->pdev->dev, "recv flow ctrl msg ME %d (single).\n",
 475                                     flow->me_addr);
 476                                 dev_dbg(&dev->pdev->dev, "flow control credentials =%d.\n",
 477                                     client->mei_flow_ctrl_creds);
 478                         } else {
 479                                 BUG();  /* error in flow control */
 480                         }
 481                 }
 482         }
 483 }
 484
 485 /**
 486  * mei_client_flow_control_response - flow control response irq routine
 487  *
 488  * @dev: the device structure
 489  * @flow_control: flow control response bus message
 490  */
 491 static void mei_client_flow_control_response(struct mei_device *dev,
 492                 struct hbm_flow_control *flow_control)
 493 {
 494         struct mei_cl *cl_pos = NULL;
 495         struct mei_cl *cl_next = NULL;
 496
 497         if (!flow_control->host_addr) {
 498                 /* single receive buffer */
 499                 add_single_flow_creds(dev, flow_control);
 500         } else {
 501                 /* normal connection */
 502                 list_for_each_entry_safe(cl_pos, cl_next,
 503                                 &dev->file_list, link) {
 504                         dev_dbg(&dev->pdev->dev, "list_for_each_entry_safe in file_list\n");
 505
 506                         dev_dbg(&dev->pdev->dev, "cl of host client %d ME client %d.\n",
 507                             cl_pos->host_client_id,
 508                             cl_pos->me_client_id);
 509                         dev_dbg(&dev->pdev->dev, "flow ctrl msg for host %d ME %d.\n",
 510                             flow_control->host_addr,
 511                             flow_control->me_addr);
 512                         if (same_flow_addr(cl_pos, flow_control)) {
 513                                 dev_dbg(&dev->pdev->dev, "recv ctrl msg for host  %d ME %d.\n",
 514                                     flow_control->host_addr,
 515                                     flow_control->me_addr);
 516                                 cl_pos->mei_flow_ctrl_creds++;
 517                                 dev_dbg(&dev->pdev->dev, "flow control credentials = %d.\n",
 518                                     cl_pos->mei_flow_ctrl_creds);
 519                                 break;
 520                         }
 521                 }
 522         }
 523 }
 524
 525 /**
 526  * same_disconn_addr - tells if they have the same address
 527  *
 528  * @file: private data of the file object.
 529  * @disconn: disconnection request.
 530  *
 531  * returns !=0, same; 0,not.
 532  */
 533 static int same_disconn_addr(struct mei_cl *cl,
 534                              struct hbm_client_disconnect_request *disconn)
 535 {
 536         return (cl->host_client_id == disconn->host_addr &&
 537                 cl->me_client_id == disconn->me_addr);
 538 }
 539
 540 /**
 541  * mei_client_disconnect_request - disconnects from request irq routine
 542  *
 543  * @dev: the device structure.
 544  * @disconnect_req: disconnect request bus message.
 545  */
 546 static void mei_client_disconnect_request(struct mei_device *dev,
 547                 struct hbm_client_disconnect_request *disconnect_req)
 548 {
 549         struct mei_msg_hdr *mei_hdr;
 550         struct hbm_client_connect_response *disconnect_res;
 551         struct mei_cl *cl_pos = NULL;
 552         struct mei_cl *cl_next = NULL;
 553
 554         list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
 555                 if (same_disconn_addr(cl_pos, disconnect_req)) {
 556                         dev_dbg(&dev->pdev->dev, "disconnect request host client %d ME client %d.\n",
 557                                         disconnect_req->host_addr,
 558                                         disconnect_req->me_addr);
 559                         cl_pos->state = MEI_FILE_DISCONNECTED;
 560                         cl_pos->timer_count = 0;
 561                         if (cl_pos == &dev->wd_cl)
 562                                 dev->wd_pending = false;
 563                         else if (cl_pos == &dev->iamthif_cl)
 564                                 dev->iamthif_timer = 0;
 565
 566                         /* prepare disconnect response */
 567                         mei_hdr =
 568                                 (struct mei_msg_hdr *) &dev->ext_msg_buf[0];
 569                         mei_hdr->host_addr = 0;
 570                         mei_hdr->me_addr = 0;
 571                         mei_hdr->length =
 572                                 sizeof(struct hbm_client_connect_response);
 573                         mei_hdr->msg_complete = 1;
 574                         mei_hdr->reserved = 0;
 575
 576                         disconnect_res =
 577                                 (struct hbm_client_connect_response *)
 578                                 &dev->ext_msg_buf[1];
 579                         disconnect_res->host_addr = cl_pos->host_client_id;
 580                         disconnect_res->me_addr = cl_pos->me_client_id;
 581                         disconnect_res->hbm_cmd = CLIENT_DISCONNECT_RES_CMD;
 582                         disconnect_res->status = 0;
 583                         dev->extra_write_index = 2;
 584                         break;
 585                 }
 586         }
 587 }
 588
 589
 590 /**
 591  * mei_irq_thread_read_bus_message - bottom half read routine after ISR to
 592  * handle the read bus message cmd processing.
 593  *
 594  * @dev: the device structure
 595  * @mei_hdr: header of bus message
 596  */
 597 static void mei_irq_thread_read_bus_message(struct mei_device *dev,
 598                 struct mei_msg_hdr *mei_hdr)
 599 {
 600         struct mei_bus_message *mei_msg;
 601         struct hbm_host_version_response *version_res;
 602         struct hbm_client_connect_response *connect_res;
 603         struct hbm_client_connect_response *disconnect_res;
 604         struct hbm_flow_control *flow_control;
 605         struct hbm_props_response *props_res;
 606         struct hbm_host_enum_response *enum_res;
 607         struct hbm_client_disconnect_request *disconnect_req;
 608         struct hbm_host_stop_request *host_stop_req;
 609         int res;
 610
 611
 612         /* read the message to our buffer */
 613         BUG_ON(mei_hdr->length >= sizeof(dev->rd_msg_buf));
 614         mei_read_slots(dev, dev->rd_msg_buf, mei_hdr->length);
 615         mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
 616
 617         switch (mei_msg->hbm_cmd) {
 618         case HOST_START_RES_CMD:
 619                 version_res = (struct hbm_host_version_response *) mei_msg;
 620                 if (version_res->host_version_supported) {
 621                         dev->version.major_version = HBM_MAJOR_VERSION;
 622                         dev->version.minor_version = HBM_MINOR_VERSION;
 623                         if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
 624                             dev->init_clients_state == MEI_START_MESSAGE) {
 625                                 dev->init_clients_timer = 0;
 626                                 mei_host_enum_clients_message(dev);
 627                         } else {
 628                                 dev->recvd_msg = false;
 629                                 dev_dbg(&dev->pdev->dev, "IMEI reset due to received host start response bus message.\n");
 630                                 mei_reset(dev, 1);
 631                                 return;
 632                         }
 633                 } else {
 634                         dev->version = version_res->me_max_version;
 635                         /* send stop message */
 636                         mei_hdr = (struct mei_msg_hdr *)&dev->wr_msg_buf[0];
 637                         mei_hdr->host_addr = 0;
 638                         mei_hdr->me_addr = 0;
 639                         mei_hdr->length = sizeof(struct hbm_host_stop_request);
 640                         mei_hdr->msg_complete = 1;
 641                         mei_hdr->reserved = 0;
 642
 643                         host_stop_req = (struct hbm_host_stop_request *)
 644                                                         &dev->wr_msg_buf[1];
 645
 646                         memset(host_stop_req,
 647                                         0,
 648                                         sizeof(struct hbm_host_stop_request));
 649                         host_stop_req->hbm_cmd = HOST_STOP_REQ_CMD;
 650                         host_stop_req->reason = DRIVER_STOP_REQUEST;
 651                         mei_write_message(dev, mei_hdr,
 652                                            (unsigned char *) (host_stop_req),
 653                                            mei_hdr->length);
 654                         dev_dbg(&dev->pdev->dev, "version mismatch.\n");
 655                         return;
 656                 }
 657
 658                 dev->recvd_msg = true;
 659                 dev_dbg(&dev->pdev->dev, "host start response message received.\n");
 660                 break;
 661
 662         case CLIENT_CONNECT_RES_CMD:
 663                 connect_res =
 664                         (struct hbm_client_connect_response *) mei_msg;
 665                 mei_client_connect_response(dev, connect_res);
 666                 dev_dbg(&dev->pdev->dev, "client connect response message received.\n");
 667                 wake_up(&dev->wait_recvd_msg);
 668                 break;
 669
 670         case CLIENT_DISCONNECT_RES_CMD:
 671                 disconnect_res =
 672                         (struct hbm_client_connect_response *) mei_msg;
 673                 mei_client_disconnect_response(dev, disconnect_res);
 674                 dev_dbg(&dev->pdev->dev, "client disconnect response message received.\n");
 675                 wake_up(&dev->wait_recvd_msg);
 676                 break;
 677
 678         case MEI_FLOW_CONTROL_CMD:
 679                 flow_control = (struct hbm_flow_control *) mei_msg;
 680                 mei_client_flow_control_response(dev, flow_control);
 681                 dev_dbg(&dev->pdev->dev, "client flow control response message received.\n");
 682                 break;
 683
 684         case HOST_CLIENT_PROPERTIES_RES_CMD:
 685                 props_res = (struct hbm_props_response *)mei_msg;
 686                 if (props_res->status || !dev->me_clients) {
 687                         dev_dbg(&dev->pdev->dev, "reset due to received host client properties response bus message wrong status.\n");
 688                         mei_reset(dev, 1);
 689                         return;
 690                 }
 691                 if (dev->me_clients[dev->me_client_presentation_num]
 692                                         .client_id == props_res->address) {
 693
 694                         dev->me_clients[dev->me_client_presentation_num].props
 695                                                 = props_res->client_properties;
 696
 697                         if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
 698                             dev->init_clients_state ==
 699                                         MEI_CLIENT_PROPERTIES_MESSAGE) {
 700                                 dev->me_client_index++;
 701                                 dev->me_client_presentation_num++;
 702
 703                                 /** Send Client Properties request **/
 704                                 res = mei_host_client_properties(dev);
 705                                 if (res < 0) {
 706                                         dev_dbg(&dev->pdev->dev, "mei_host_client_properties() failed");
 707                                         return;
 708                                 } else if (!res) {
 709                                         /*
 710                                          * No more clients to send to.
 711                                          * Clear Map for indicating now ME clients
 712                                          * with associated host client
 713                                          */
 714                                         bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
 715                                         dev->open_handle_count = 0;
 716
 717                                         /*
 718                                          * Reserving the first three client IDs
 719                                          * Client Id 0 - Reserved for MEI Bus Message communications
 720                                          * Client Id 1 - Reserved for Watchdog
 721                                          * Client ID 2 - Reserved for AMTHI
 722                                          */
 723                                         bitmap_set(dev->host_clients_map, 0, 3);
 724                                         dev->dev_state = MEI_DEV_ENABLED;
 725
 726                                         /* if wd initialization fails, initialization the AMTHI client,
 727                                          * otherwise the AMTHI client will be initialized after the WD client connect response
 728                                          * will be received
 729                                          */
 730                                         if (mei_wd_host_init(dev))
 731                                                 mei_host_init_iamthif(dev);
 732                                 }
 733
 734                         } else {
 735                                 dev_dbg(&dev->pdev->dev, "reset due to received host client properties response bus message");
 736                                 mei_reset(dev, 1);
 737                                 return;
 738                         }
 739                 } else {
 740                         dev_dbg(&dev->pdev->dev, "reset due to received host client properties response bus message for wrong client ID\n");
 741                         mei_reset(dev, 1);
 742                         return;
 743                 }
 744                 break;
 745
 746         case HOST_ENUM_RES_CMD:
 747                 enum_res = (struct hbm_host_enum_response *) mei_msg;
 748                 memcpy(dev->me_clients_map, enum_res->valid_addresses, 32);
 749                 if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
 750                     dev->init_clients_state == MEI_ENUM_CLIENTS_MESSAGE) {
 751                                 dev->init_clients_timer = 0;
 752                                 dev->me_client_presentation_num = 0;
 753                                 dev->me_client_index = 0;
 754                                 mei_allocate_me_clients_storage(dev);
 755                                 dev->init_clients_state =
 756                                         MEI_CLIENT_PROPERTIES_MESSAGE;
 757                                 mei_host_client_properties(dev);
 758                 } else {
 759                         dev_dbg(&dev->pdev->dev, "reset due to received host enumeration clients response bus message.\n");
 760                         mei_reset(dev, 1);
 761                         return;
 762                 }
 763                 break;
 764
 765         case HOST_STOP_RES_CMD:
 766                 dev->dev_state = MEI_DEV_DISABLED;
 767                 dev_dbg(&dev->pdev->dev, "resetting because of FW stop response.\n");
 768                 mei_reset(dev, 1);
 769                 break;
 770
 771         case CLIENT_DISCONNECT_REQ_CMD:
 772                 /* search for client */
 773                 disconnect_req =
 774                         (struct hbm_client_disconnect_request *) mei_msg;
 775                 mei_client_disconnect_request(dev, disconnect_req);
 776                 break;
 777
 778         case ME_STOP_REQ_CMD:
 779                 /* prepare stop request */
 780                 mei_hdr = (struct mei_msg_hdr *) &dev->ext_msg_buf[0];
 781                 mei_hdr->host_addr = 0;
 782                 mei_hdr->me_addr = 0;
 783                 mei_hdr->length = sizeof(struct hbm_host_stop_request);
 784                 mei_hdr->msg_complete = 1;
 785                 mei_hdr->reserved = 0;
 786                 host_stop_req =
 787                         (struct hbm_host_stop_request *) &dev->ext_msg_buf[1];
 788                 memset(host_stop_req, 0, sizeof(struct hbm_host_stop_request));
 789                 host_stop_req->hbm_cmd = HOST_STOP_REQ_CMD;
 790                 host_stop_req->reason = DRIVER_STOP_REQUEST;
 791                 host_stop_req->reserved[0] = 0;
 792                 host_stop_req->reserved[1] = 0;
 793                 dev->extra_write_index = 2;
 794                 break;
 795
 796         default:
 797                 BUG();
 798                 break;
 799
 800         }
 801 }
 802
 803
 804 /**
 805  * _mei_hb_read - processes read related operation.
 806  *
 807  * @dev: the device structure.
 808  * @slots: free slots.
 809  * @cb_pos: callback block.
 810  * @cl: private data of the file object.
 811  * @cmpl_list: complete list.
 812  *
 813  * returns 0, OK; otherwise, error.
 814  */
 815 static int _mei_irq_thread_read(struct mei_device *dev, s32 *slots,
 816                         struct mei_cl_cb *cb_pos,
 817                         struct mei_cl *cl,
 818                         struct mei_cl_cb *cmpl_list)
 819 {
 820         if ((*slots * sizeof(u32)) < (sizeof(struct mei_msg_hdr) +
 821                         sizeof(struct hbm_flow_control))) {
 822                 /* return the cancel routine */
 823                 list_del(&cb_pos->list);
 824                 return -EBADMSG;
 825         }
 826
 827         *slots -= mei_data2slots(sizeof(struct hbm_flow_control));
 828
 829         if (mei_send_flow_control(dev, cl)) {
 830                 cl->status = -ENODEV;
 831                 cb_pos->buf_idx = 0;
 832                 list_move_tail(&cb_pos->list, &cmpl_list->list);
 833                 return -ENODEV;
 834         }
 835         list_move_tail(&cb_pos->list, &dev->read_list.list);
 836
 837         return 0;
 838 }
 839
 840
 841 /**
 842  * _mei_irq_thread_ioctl - processes ioctl related operation.
 843  *
 844  * @dev: the device structure.
 845  * @slots: free slots.
 846  * @cb_pos: callback block.
 847  * @cl: private data of the file object.
 848  * @cmpl_list: complete list.
 849  *
 850  * returns 0, OK; otherwise, error.
 851  */
 852 static int _mei_irq_thread_ioctl(struct mei_device *dev, s32 *slots,
 853                         struct mei_cl_cb *cb_pos,
 854                         struct mei_cl *cl,
 855                         struct mei_cl_cb *cmpl_list)
 856 {
 857         if ((*slots * sizeof(u32)) < (sizeof(struct mei_msg_hdr) +
 858                         sizeof(struct hbm_client_connect_request))) {
 859                 /* return the cancel routine */
 860                 list_del(&cb_pos->list);
 861                 return -EBADMSG;
 862         }
 863
 864         cl->state = MEI_FILE_CONNECTING;
 865          *slots -= mei_data2slots(sizeof(struct hbm_client_connect_request));
 866         if (mei_connect(dev, cl)) {
 867                 cl->status = -ENODEV;
 868                 cb_pos->buf_idx = 0;
 869                 list_del(&cb_pos->list);
 870                 return -ENODEV;
 871         } else {
 872                 list_move_tail(&cb_pos->list, &dev->ctrl_rd_list.list);
 873                 cl->timer_count = MEI_CONNECT_TIMEOUT;
 874         }
 875         return 0;
 876 }
 877
 878 /**
 879  * _mei_irq_thread_cmpl - processes completed and no-iamthif operation.
 880  *
 881  * @dev: the device structure.
 882  * @slots: free slots.
 883  * @cb_pos: callback block.
 884  * @cl: private data of the file object.
 885  * @cmpl_list: complete list.
 886  *
 887  * returns 0, OK; otherwise, error.
 888  */
 889 static int _mei_irq_thread_cmpl(struct mei_device *dev, s32 *slots,
 890                         struct mei_cl_cb *cb_pos,
 891                         struct mei_cl *cl,
 892                         struct mei_cl_cb *cmpl_list)
 893 {
 894         struct mei_msg_hdr *mei_hdr;
 895
 896         if ((*slots * sizeof(u32)) >= (sizeof(struct mei_msg_hdr) +
 897                         (cb_pos->request_buffer.size - cb_pos->buf_idx))) {
 898                 mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
 899                 mei_hdr->host_addr = cl->host_client_id;
 900                 mei_hdr->me_addr = cl->me_client_id;
 901                 mei_hdr->length = cb_pos->request_buffer.size - cb_pos->buf_idx;
 902                 mei_hdr->msg_complete = 1;
 903                 mei_hdr->reserved = 0;
 904                 dev_dbg(&dev->pdev->dev, "cb_pos->request_buffer.size =%d"
 905                         "mei_hdr->msg_complete = %d\n",
 906                                 cb_pos->request_buffer.size,
 907                                 mei_hdr->msg_complete);
 908                 dev_dbg(&dev->pdev->dev, "cb_pos->buf_idx  =%lu\n",
 909                                 cb_pos->buf_idx);
 910                 dev_dbg(&dev->pdev->dev, "mei_hdr->length  =%d\n",
 911                                 mei_hdr->length);
 912                 *slots -= mei_data2slots(mei_hdr->length);
 913                 if (mei_write_message(dev, mei_hdr,
 914                                 (unsigned char *)
 915                                 (cb_pos->request_buffer.data +
 916                                 cb_pos->buf_idx),
 917                                 mei_hdr->length)) {
 918                         cl->status = -ENODEV;
 919                         list_move_tail(&cb_pos->list, &cmpl_list->list);
 920                         return -ENODEV;
 921                 } else {
 922                         if (mei_flow_ctrl_reduce(dev, cl))
 923                                 return -ENODEV;
 924                         cl->status = 0;
 925                         cb_pos->buf_idx += mei_hdr->length;
 926                         list_move_tail(&cb_pos->list, &dev->write_waiting_list.list);
 927                 }
 928         } else if (*slots == dev->hbuf_depth) {
 929                 /* buffer is still empty */
 930                 mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
 931                 mei_hdr->host_addr = cl->host_client_id;
 932                 mei_hdr->me_addr = cl->me_client_id;
 933                 mei_hdr->length =
 934                         (*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
 935                 mei_hdr->msg_complete = 0;
 936                 mei_hdr->reserved = 0;
 937                 *slots -= mei_data2slots(mei_hdr->length);
 938                 if (mei_write_message(dev, mei_hdr,
 939                                         (unsigned char *)
 940                                         (cb_pos->request_buffer.data +
 941                                         cb_pos->buf_idx),
 942                                         mei_hdr->length)) {
 943                         cl->status = -ENODEV;
 944                         list_move_tail(&cb_pos->list, &cmpl_list->list);
 945                         return -ENODEV;
 946                 } else {
 947                         cb_pos->buf_idx += mei_hdr->length;
 948                         dev_dbg(&dev->pdev->dev,
 949                                         "cb_pos->request_buffer.size =%d"
 950                                         " mei_hdr->msg_complete = %d\n",
 951                                         cb_pos->request_buffer.size,
 952                                         mei_hdr->msg_complete);
 953                         dev_dbg(&dev->pdev->dev, "cb_pos->buf_idx  =%lu\n",
 954                                         cb_pos->buf_idx);
 955                         dev_dbg(&dev->pdev->dev, "mei_hdr->length  =%d\n",
 956                                         mei_hdr->length);
 957                 }
 958                 return -EMSGSIZE;
 959         } else {
 960                 return -EBADMSG;
 961         }
 962
 963         return 0;
 964 }
 965
 966 /**
 967  * _mei_irq_thread_cmpl_iamthif - processes completed iamthif operation.
 968  *
 969  * @dev: the device structure.
 970  * @slots: free slots.
 971  * @cb_pos: callback block.
 972  * @cl: private data of the file object.
 973  * @cmpl_list: complete list.
 974  *
 975  * returns 0, OK; otherwise, error.
 976  */
 977 static int _mei_irq_thread_cmpl_iamthif(struct mei_device *dev, s32 *slots,
 978                         struct mei_cl_cb *cb_pos,
 979                         struct mei_cl *cl,
 980                         struct mei_cl_cb *cmpl_list)
 981 {
 982         struct mei_msg_hdr *mei_hdr;
 983
 984         if ((*slots * sizeof(u32)) >= (sizeof(struct mei_msg_hdr) +
 985                         dev->iamthif_msg_buf_size -
 986                         dev->iamthif_msg_buf_index)) {
 987                 mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
 988                 mei_hdr->host_addr = cl->host_client_id;
 989                 mei_hdr->me_addr = cl->me_client_id;
 990                 mei_hdr->length = dev->iamthif_msg_buf_size -
 991                         dev->iamthif_msg_buf_index;
 992                 mei_hdr->msg_complete = 1;
 993                 mei_hdr->reserved = 0;
 994
 995                 *slots -= mei_data2slots(mei_hdr->length);
 996
 997                 if (mei_write_message(dev, mei_hdr,
 998                                         (dev->iamthif_msg_buf +
 999                                         dev->iamthif_msg_buf_index),
1000                                         mei_hdr->length)) {
1001                         dev->iamthif_state = MEI_IAMTHIF_IDLE;
1002                         cl->status = -ENODEV;
1003                         list_del(&cb_pos->list);
1004                         return -ENODEV;
1005                 } else {
1006                         if (mei_flow_ctrl_reduce(dev, cl))
1007                                 return -ENODEV;
1008                         dev->iamthif_msg_buf_index += mei_hdr->length;
1009                         cb_pos->buf_idx = dev->iamthif_msg_buf_index;
1010                         cl->status = 0;
1011                         dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
1012                         dev->iamthif_flow_control_pending = true;
1013                         /* save iamthif cb sent to amthi client */
1014                         dev->iamthif_current_cb = cb_pos;
1015                         list_move_tail(&cb_pos->list, &dev->write_waiting_list.list);
1016
1017                 }
1018         } else if (*slots == dev->hbuf_depth) {
1019                 /* buffer is still empty */
1020                 mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
1021                 mei_hdr->host_addr = cl->host_client_id;
1022                 mei_hdr->me_addr = cl->me_client_id;
1023                 mei_hdr->length =
1024                         (*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
1025                 mei_hdr->msg_complete = 0;
1026                 mei_hdr->reserved = 0;
1027
1028                 *slots -= mei_data2slots(mei_hdr->length);
1029
1030                 if (mei_write_message(dev, mei_hdr,
1031                                         (dev->iamthif_msg_buf +
1032                                         dev->iamthif_msg_buf_index),
1033                                         mei_hdr->length)) {
1034                         cl->status = -ENODEV;
1035                         list_del(&cb_pos->list);
1036                 } else {
1037                         dev->iamthif_msg_buf_index += mei_hdr->length;
1038                 }
1039                 return -EMSGSIZE;
1040         } else {
1041                 return -EBADMSG;
1042         }
1043
1044         return 0;
1045 }
1046
1047 /**
1048  * mei_irq_thread_read_handler - bottom half read routine after ISR to
1049  * handle the read processing.
1050  *
1051  * @cmpl_list: An instance of our list structure
1052  * @dev: the device structure
1053  * @slots: slots to read.
1054  *
1055  * returns 0 on success, <0 on failure.
1056  */
1057 static int mei_irq_thread_read_handler(struct mei_cl_cb *cmpl_list,
1058                 struct mei_device *dev,
1059                 s32 *slots)
1060 {
1061         struct mei_msg_hdr *mei_hdr;
1062         struct mei_cl *cl_pos = NULL;
1063         struct mei_cl *cl_next = NULL;
1064         int ret = 0;
1065
1066         if (!dev->rd_msg_hdr) {
1067                 dev->rd_msg_hdr = mei_mecbrw_read(dev);
1068                 dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
1069                 (*slots)--;
1070                 dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
1071         }
1072         mei_hdr = (struct mei_msg_hdr *) &dev->rd_msg_hdr;
1073         dev_dbg(&dev->pdev->dev, "mei_hdr->length =%d\n", mei_hdr->length);
1074
1075         if (mei_hdr->reserved || !dev->rd_msg_hdr) {
1076                 dev_dbg(&dev->pdev->dev, "corrupted message header.\n");
1077                 ret = -EBADMSG;
1078                 goto end;
1079         }
1080
1081         if (mei_hdr->host_addr || mei_hdr->me_addr) {
1082                 list_for_each_entry_safe(cl_pos, cl_next,
1083                                         &dev->file_list, link) {
1084                         dev_dbg(&dev->pdev->dev,
1085                                         "list_for_each_entry_safe read host"
1086                                         " client = %d, ME client = %d\n",
1087                                         cl_pos->host_client_id,
1088                                         cl_pos->me_client_id);
1089                         if (cl_pos->host_client_id == mei_hdr->host_addr &&
1090                             cl_pos->me_client_id == mei_hdr->me_addr)
1091                                 break;
1092                 }
1093
1094                 if (&cl_pos->link == &dev->file_list) {
1095                         dev_dbg(&dev->pdev->dev, "corrupted message header\n");
1096                         ret = -EBADMSG;
1097                         goto end;
1098                 }
1099         }
1100         if (((*slots) * sizeof(u32)) < mei_hdr->length) {
1101                 dev_dbg(&dev->pdev->dev,
1102                                 "we can't read the message slots =%08x.\n",
1103                                 *slots);
1104                 /* we can't read the message */
1105                 ret = -ERANGE;
1106                 goto end;
1107         }
1108
1109         /* decide where to read the message too */
1110         if (!mei_hdr->host_addr) {
1111                 dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_bus_message.\n");
1112                 mei_irq_thread_read_bus_message(dev, mei_hdr);
1113                 dev_dbg(&dev->pdev->dev, "end mei_irq_thread_read_bus_message.\n");
1114         } else if (mei_hdr->host_addr == dev->iamthif_cl.host_client_id &&
1115                    (MEI_FILE_CONNECTED == dev->iamthif_cl.state) &&
1116                    (dev->iamthif_state == MEI_IAMTHIF_READING)) {
1117                 dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_iamthif_message.\n");
1118                 dev_dbg(&dev->pdev->dev, "mei_hdr->length =%d\n",
1119                                 mei_hdr->length);
1120                 ret = mei_irq_thread_read_amthi_message(cmpl_list,
1121                                                         dev, mei_hdr);
1122                 if (ret)
1123                         goto end;
1124
1125         } else {
1126                 dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_client_message.\n");
1127                 ret = mei_irq_thread_read_client_message(cmpl_list,
1128                                                          dev, mei_hdr);
1129                 if (ret)
1130                         goto end;
1131
1132         }
1133
1134         /* reset the number of slots and header */
1135         *slots = mei_count_full_read_slots(dev);
1136         dev->rd_msg_hdr = 0;
1137
1138         if (*slots == -EOVERFLOW) {
1139                 /* overflow - reset */
1140                 dev_dbg(&dev->pdev->dev, "resetting due to slots overflow.\n");
1141                 /* set the event since message has been read */
1142                 ret = -ERANGE;
1143                 goto end;
1144         }
1145 end:
1146         return ret;
1147 }
1148
1149
1150 /**
1151  * mei_irq_thread_write_handler - bottom half write routine after
1152  * ISR to handle the write processing.
1153  *
1154  * @cmpl_list: An instance of our list structure
1155  * @dev: the device structure
1156  * @slots: slots to write.
1157  *
1158  * returns 0 on success, <0 on failure.
1159  */
1160 static int mei_irq_thread_write_handler(struct mei_cl_cb *cmpl_list,
1161                 struct mei_device *dev, s32 *slots)
1162 {
1163
1164         struct mei_cl *cl;
1165         struct mei_cl_cb *pos = NULL, *next = NULL;
1166         struct mei_cl_cb *list;
1167         int ret;
1168
1169         if (!mei_hbuf_is_empty(dev)) {
1170                 dev_dbg(&dev->pdev->dev, "host buffer is not empty.\n");
1171                 return 0;
1172         }
1173         *slots = mei_hbuf_empty_slots(dev);
1174         if (*slots <= 0)
1175                 return -EMSGSIZE;
1176
1177         /* complete all waiting for write CB */
1178         dev_dbg(&dev->pdev->dev, "complete all waiting for write cb.\n");
1179
1180         list = &dev->write_waiting_list;
1181         list_for_each_entry_safe(pos, next, &list->list, list) {
1182                 cl = (struct mei_cl *)pos->file_private;
1183                 if (cl == NULL)
1184                         continue;
1185
1186                 cl->status = 0;
1187                 list_del(&pos->list);
1188                 if (MEI_WRITING == cl->writing_state &&
1189                    (pos->major_file_operations == MEI_WRITE) &&
1190                    (cl != &dev->iamthif_cl)) {
1191                         dev_dbg(&dev->pdev->dev, "MEI WRITE COMPLETE\n");
1192                         cl->writing_state = MEI_WRITE_COMPLETE;
1193                         list_add_tail(&pos->list, &cmpl_list->list);
1194                 }
1195                 if (cl == &dev->iamthif_cl) {
1196                         dev_dbg(&dev->pdev->dev, "check iamthif flow control.\n");
1197                         if (dev->iamthif_flow_control_pending) {
1198                                 ret = _mei_irq_thread_iamthif_read(dev, slots);
1199                                 if (ret)
1200                                         return ret;
1201                         }
1202                 }
1203         }
1204
1205         if (dev->wd_state == MEI_WD_STOPPING) {
1206                 dev->wd_state = MEI_WD_IDLE;
1207                 wake_up_interruptible(&dev->wait_stop_wd);
1208         }
1209
1210         if (dev->extra_write_index) {
1211                 dev_dbg(&dev->pdev->dev, "extra_write_index =%d.\n",
1212                                 dev->extra_write_index);
1213                 mei_write_message(dev,
1214                                 (struct mei_msg_hdr *) &dev->ext_msg_buf[0],
1215                                 (unsigned char *) &dev->ext_msg_buf[1],
1216                                 (dev->extra_write_index - 1) * sizeof(u32));
1217                 *slots -= dev->extra_write_index;
1218                 dev->extra_write_index = 0;
1219         }
1220         if (dev->dev_state == MEI_DEV_ENABLED) {
1221                 if (dev->wd_pending &&
1222                     mei_flow_ctrl_creds(dev, &dev->wd_cl) > 0) {
1223                         if (mei_wd_send(dev))
1224                                 dev_dbg(&dev->pdev->dev, "wd send failed.\n");
1225                         else if (mei_flow_ctrl_reduce(dev, &dev->wd_cl))
1226                                 return -ENODEV;
1227
1228                         dev->wd_pending = false;
1229
1230                         if (dev->wd_state == MEI_WD_RUNNING)
1231                                 *slots -= mei_data2slots(MEI_WD_START_MSG_SIZE);
1232                         else
1233                                 *slots -= mei_data2slots(MEI_WD_STOP_MSG_SIZE);
1234                 }
1235         }
1236
1237         /* complete control write list CB */
1238         dev_dbg(&dev->pdev->dev, "complete control write list cb.\n");
1239         list_for_each_entry_safe(pos, next, &dev->ctrl_wr_list.list, list) {
1240                 cl = (struct mei_cl *) pos->file_private;
1241                 if (!cl) {
1242                         list_del(&pos->list);
1243                         return -ENODEV;
1244                 }
1245                 switch (pos->major_file_operations) {
1246                 case MEI_CLOSE:
1247                         /* send disconnect message */
1248                         ret = _mei_irq_thread_close(dev, slots, pos, cl, cmpl_list);
1249                         if (ret)
1250                                 return ret;
1251
1252                         break;
1253                 case MEI_READ:
1254                         /* send flow control message */
1255                         ret = _mei_irq_thread_read(dev, slots, pos, cl, cmpl_list);
1256                         if (ret)
1257                                 return ret;
1258
1259                         break;
1260                 case MEI_IOCTL:
1261                         /* connect message */
1262                         if (mei_other_client_is_connecting(dev, cl))
1263                                 continue;
1264                         ret = _mei_irq_thread_ioctl(dev, slots, pos, cl, cmpl_list);
1265                         if (ret)
1266                                 return ret;
1267
1268                         break;
1269
1270                 default:
1271                         BUG();
1272                 }
1273
1274         }
1275         /* complete  write list CB */
1276         dev_dbg(&dev->pdev->dev, "complete write list cb.\n");
1277         list_for_each_entry_safe(pos, next, &dev->write_list.list, list) {
1278                 cl = (struct mei_cl *)pos->file_private;
1279                 if (cl == NULL)
1280                         continue;
1281
1282                 if (cl != &dev->iamthif_cl) {
1283                         if (mei_flow_ctrl_creds(dev, cl) <= 0) {
1284                                 dev_dbg(&dev->pdev->dev,
1285                                         "No flow control credentials for client %d, not sending.\n",
1286                                         cl->host_client_id);
1287                                 continue;
1288                         }
1289                         ret = _mei_irq_thread_cmpl(dev, slots, pos,
1290                                                 cl, cmpl_list);
1291                         if (ret)
1292                                 return ret;
1293
1294                 } else if (cl == &dev->iamthif_cl) {
1295                         /* IAMTHIF IOCTL */
1296                         dev_dbg(&dev->pdev->dev, "complete amthi write cb.\n");
1297                         if (mei_flow_ctrl_creds(dev, cl) <= 0) {
1298                                 dev_dbg(&dev->pdev->dev,
1299                                         "No flow control credentials for amthi client %d.\n",
1300                                         cl->host_client_id);
1301                                 continue;
1302                         }
1303                         ret = _mei_irq_thread_cmpl_iamthif(dev, slots, pos,
1304                                                 cl, cmpl_list);
1305                         if (ret)
1306                                 return ret;
1307
1308                 }
1309
1310         }
1311         return 0;
1312 }
1313
1314
1315
1316 /**
1317  * mei_timer - timer function.
1318  *
1319  * @work: pointer to the work_struct structure
1320  *
1321  * NOTE: This function is called by timer interrupt work
1322  */
1323 void mei_timer(struct work_struct *work)
1324 {
1325         unsigned long timeout;
1326         struct mei_cl *cl_pos = NULL;
1327         struct mei_cl *cl_next = NULL;
1328         struct list_head *amthi_complete_list = NULL;
1329         struct mei_cl_cb  *cb_pos = NULL;
1330         struct mei_cl_cb  *cb_next = NULL;
1331
1332         struct mei_device *dev = container_of(work,
1333                                         struct mei_device, timer_work.work);
1334
1335
1336         mutex_lock(&dev->device_lock);
1337         if (dev->dev_state != MEI_DEV_ENABLED) {
1338                 if (dev->dev_state == MEI_DEV_INIT_CLIENTS) {
1339                         if (dev->init_clients_timer) {
1340                                 if (--dev->init_clients_timer == 0) {
1341                                         dev_dbg(&dev->pdev->dev, "IMEI reset due to init clients timeout ,init clients state = %d.\n",
1342                                                 dev->init_clients_state);
1343                                         mei_reset(dev, 1);
1344                                 }
1345                         }
1346                 }
1347                 goto out;
1348         }
1349         /*** connect/disconnect timeouts ***/
1350         list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
1351                 if (cl_pos->timer_count) {
1352                         if (--cl_pos->timer_count == 0) {
1353                                 dev_dbg(&dev->pdev->dev, "HECI reset due to connect/disconnect timeout.\n");
1354                                 mei_reset(dev, 1);
1355                                 goto out;
1356                         }
1357                 }
1358         }
1359
1360         if (dev->iamthif_stall_timer) {
1361                 if (--dev->iamthif_stall_timer == 0) {
1362                         dev_dbg(&dev->pdev->dev, "resetting because of hang to amthi.\n");
1363                         mei_reset(dev, 1);
1364                         dev->iamthif_msg_buf_size = 0;
1365                         dev->iamthif_msg_buf_index = 0;
1366                         dev->iamthif_canceled = false;
1367                         dev->iamthif_ioctl = true;
1368                         dev->iamthif_state = MEI_IAMTHIF_IDLE;
1369                         dev->iamthif_timer = 0;
1370
1371                         if (dev->iamthif_current_cb)
1372                                 mei_free_cb_private(dev->iamthif_current_cb);
1373
1374                         dev->iamthif_file_object = NULL;
1375                         dev->iamthif_current_cb = NULL;
1376                         mei_run_next_iamthif_cmd(dev);
1377                 }
1378         }
1379
1380         if (dev->iamthif_timer) {
1381
1382                 timeout = dev->iamthif_timer +
1383                                 msecs_to_jiffies(IAMTHIF_READ_TIMER);
1384
1385                 dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
1386                                 dev->iamthif_timer);
1387                 dev_dbg(&dev->pdev->dev, "timeout = %ld\n", timeout);
1388                 dev_dbg(&dev->pdev->dev, "jiffies = %ld\n", jiffies);
1389                 if (time_after(jiffies, timeout)) {
1390                         /*
1391                          * User didn't read the AMTHI data on time (15sec)
1392                          * freeing AMTHI for other requests
1393                          */
1394
1395                         dev_dbg(&dev->pdev->dev, "freeing AMTHI for other requests\n");
1396
1397                         amthi_complete_list = &dev->amthi_read_complete_list.list;
1398
1399                         list_for_each_entry_safe(cb_pos, cb_next, amthi_complete_list, list) {
1400
1401                                 cl_pos = cb_pos->file_object->private_data;
1402
1403                                 /* Finding the AMTHI entry. */
1404                                 if (cl_pos == &dev->iamthif_cl)
1405                                         list_del(&cb_pos->list);
1406                         }
1407                         if (dev->iamthif_current_cb)
1408                                 mei_free_cb_private(dev->iamthif_current_cb);
1409
1410                         dev->iamthif_file_object->private_data = NULL;
1411                         dev->iamthif_file_object = NULL;
1412                         dev->iamthif_current_cb = NULL;
1413                         dev->iamthif_timer = 0;
1414                         mei_run_next_iamthif_cmd(dev);
1415
1416                 }
1417         }
1418 out:
1419         schedule_delayed_work(&dev->timer_work, 2 * HZ);
1420         mutex_unlock(&dev->device_lock);
1421 }
1422
1423 /**
1424  *  mei_interrupt_thread_handler - function called after ISR to handle the interrupt
1425  * processing.
1426  *
1427  * @irq: The irq number
1428  * @dev_id: pointer to the device structure
1429  *
1430  * returns irqreturn_t
1431  *
1432  */
1433 irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id)
1434 {
1435         struct mei_device *dev = (struct mei_device *) dev_id;
1436         struct mei_cl_cb complete_list;
1437         struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
1438         struct mei_cl *cl;
1439         s32 slots;
1440         int rets;
1441         bool  bus_message_received;
1442
1443
1444         dev_dbg(&dev->pdev->dev, "function called after ISR to handle the interrupt processing.\n");
1445         /* initialize our complete list */
1446         mutex_lock(&dev->device_lock);
1447         mei_io_list_init(&complete_list);
1448         dev->host_hw_state = mei_hcsr_read(dev);
1449
1450         /* Ack the interrupt here
1451          * In case of MSI we don't go through the quick handler */
1452         if (pci_dev_msi_enabled(dev->pdev))
1453                 mei_reg_write(dev, H_CSR, dev->host_hw_state);
1454
1455         dev->me_hw_state = mei_mecsr_read(dev);
1456
1457         /* check if ME wants a reset */
1458         if ((dev->me_hw_state & ME_RDY_HRA) == 0 &&
1459             dev->dev_state != MEI_DEV_RESETING &&
1460             dev->dev_state != MEI_DEV_INITIALIZING) {
1461                 dev_dbg(&dev->pdev->dev, "FW not ready.\n");
1462                 mei_reset(dev, 1);
1463                 mutex_unlock(&dev->device_lock);
1464                 return IRQ_HANDLED;
1465         }
1466
1467         /*  check if we need to start the dev */
1468         if ((dev->host_hw_state & H_RDY) == 0) {
1469                 if ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA) {
1470                         dev_dbg(&dev->pdev->dev, "we need to start the dev.\n");
1471                         dev->host_hw_state |= (H_IE | H_IG | H_RDY);
1472                         mei_hcsr_set(dev);
1473                         dev->dev_state = MEI_DEV_INIT_CLIENTS;
1474                         dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n");
1475                         /* link is established
1476                          * start sending messages.
1477                          */
1478                         mei_host_start_message(dev);
1479                         mutex_unlock(&dev->device_lock);
1480                         return IRQ_HANDLED;
1481                 } else {
1482                         dev_dbg(&dev->pdev->dev, "FW not ready.\n");
1483                         mutex_unlock(&dev->device_lock);
1484                         return IRQ_HANDLED;
1485                 }
1486         }
1487         /* check slots available for reading */
1488         slots = mei_count_full_read_slots(dev);
1489         dev_dbg(&dev->pdev->dev, "slots =%08x  extra_write_index =%08x.\n",
1490                 slots, dev->extra_write_index);
1491         while (slots > 0 && !dev->extra_write_index) {
1492                 dev_dbg(&dev->pdev->dev, "slots =%08x  extra_write_index =%08x.\n",
1493                                 slots, dev->extra_write_index);
1494                 dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_handler.\n");
1495                 rets = mei_irq_thread_read_handler(&complete_list, dev, &slots);
1496                 if (rets)
1497                         goto end;
1498         }
1499         rets = mei_irq_thread_write_handler(&complete_list, dev, &slots);
1500 end:
1501         dev_dbg(&dev->pdev->dev, "end of bottom half function.\n");
1502         dev->host_hw_state = mei_hcsr_read(dev);
1503         dev->mei_host_buffer_is_empty = mei_hbuf_is_empty(dev);
1504
1505         bus_message_received = false;
1506         if (dev->recvd_msg && waitqueue_active(&dev->wait_recvd_msg)) {
1507                 dev_dbg(&dev->pdev->dev, "received waiting bus message\n");
1508                 bus_message_received = true;
1509         }
1510         mutex_unlock(&dev->device_lock);
1511         if (bus_message_received) {
1512                 dev_dbg(&dev->pdev->dev, "wake up dev->wait_recvd_msg\n");
1513                 wake_up_interruptible(&dev->wait_recvd_msg);
1514                 bus_message_received = false;
1515         }
1516         if (list_empty(&complete_list.list))
1517                 return IRQ_HANDLED;
1518
1519
1520         list_for_each_entry_safe(cb_pos, cb_next, &complete_list.list, list) {
1521                 cl = (struct mei_cl *)cb_pos->file_private;
1522                 list_del(&cb_pos->list);
1523                 if (cl) {
1524                         if (cl != &dev->iamthif_cl) {
1525                                 dev_dbg(&dev->pdev->dev, "completing call back.\n");
1526                                 _mei_cmpl(cl, cb_pos);
1527                                 cb_pos = NULL;
1528                         } else if (cl == &dev->iamthif_cl) {
1529                                 _mei_cmpl_iamthif(dev, cb_pos);
1530                         }
1531                 }
1532         }
1533         return IRQ_HANDLED;
1534 }