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->cb_list,
  91                                 &dev->amthi_read_complete_list.mei_cb.cb_list);
  92                 dev_dbg(&dev->pdev->dev, "amthi read completed.\n");
  93                 dev->iamthif_timer = jiffies;
  94                 dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
  95                                 dev->iamthif_timer);
  96         } else {
  97                 mei_run_next_iamthif_cmd(dev);
  98         }
  99
 100         dev_dbg(&dev->pdev->dev, "completing amthi call back.\n");
 101         wake_up_interruptible(&dev->iamthif_cl.wait);
 102 }
 103
 104
 105 /**
 106  * mei_irq_thread_read_amthi_message - bottom half read routine after ISR to
 107  * handle the read amthi message data processing.
 108  *
 109  * @complete_list: An instance of our list structure
 110  * @dev: the device structure
 111  * @mei_hdr: header of amthi message
 112  *
 113  * returns 0 on success, <0 on failure.
 114  */
 115 static int mei_irq_thread_read_amthi_message(struct mei_io_list *complete_list,
 116                 struct mei_device *dev,
 117                 struct mei_msg_hdr *mei_hdr)
 118 {
 119         struct mei_cl *cl;
 120         struct mei_cl_cb *cb;
 121         unsigned char *buffer;
 122
 123         BUG_ON(mei_hdr->me_addr != dev->iamthif_cl.me_client_id);
 124         BUG_ON(dev->iamthif_state != MEI_IAMTHIF_READING);
 125
 126         buffer = dev->iamthif_msg_buf + dev->iamthif_msg_buf_index;
 127         BUG_ON(dev->iamthif_mtu < dev->iamthif_msg_buf_index + mei_hdr->length);
 128
 129         mei_read_slots(dev, buffer, mei_hdr->length);
 130
 131         dev->iamthif_msg_buf_index += mei_hdr->length;
 132
 133         if (!mei_hdr->msg_complete)
 134                 return 0;
 135
 136         dev_dbg(&dev->pdev->dev,
 137                         "amthi_message_buffer_index =%d\n",
 138                         mei_hdr->length);
 139
 140         dev_dbg(&dev->pdev->dev, "completed amthi read.\n ");
 141         if (!dev->iamthif_current_cb)
 142                 return -ENODEV;
 143
 144         cb = dev->iamthif_current_cb;
 145         dev->iamthif_current_cb = NULL;
 146
 147         cl = (struct mei_cl *)cb->file_private;
 148         if (!cl)
 149                 return -ENODEV;
 150
 151         dev->iamthif_stall_timer = 0;
 152         cb->buf_idx = dev->iamthif_msg_buf_index;
 153         cb->read_time = jiffies;
 154         if (dev->iamthif_ioctl && cl == &dev->iamthif_cl) {
 155                 /* found the iamthif cb */
 156                 dev_dbg(&dev->pdev->dev, "complete the amthi read cb.\n ");
 157                 dev_dbg(&dev->pdev->dev, "add the amthi read cb to complete.\n ");
 158                 list_add_tail(&cb->cb_list,
 159                                                 &complete_list->mei_cb.cb_list);
 160         }
 161         return 0;
 162 }
 163
 164 /**
 165  * _mei_irq_thread_state_ok - checks if mei header matches file private data
 166  *
 167  * @cl: private data of the file object
 168  * @mei_hdr: header of mei client message
 169  *
 170  * returns !=0 if matches, 0 if no match.
 171  */
 172 static int _mei_irq_thread_state_ok(struct mei_cl *cl,
 173                                 struct mei_msg_hdr *mei_hdr)
 174 {
 175         return (cl->host_client_id == mei_hdr->host_addr &&
 176                 cl->me_client_id == mei_hdr->me_addr &&
 177                 cl->state == MEI_FILE_CONNECTED &&
 178                 MEI_READ_COMPLETE != cl->reading_state);
 179 }
 180
 181 /**
 182  * mei_irq_thread_read_client_message - bottom half read routine after ISR to
 183  * handle the read mei client message data processing.
 184  *
 185  * @complete_list: An instance of our list structure
 186  * @dev: the device structure
 187  * @mei_hdr: header of mei client message
 188  *
 189  * returns 0 on success, <0 on failure.
 190  */
 191 static int mei_irq_thread_read_client_message(struct mei_io_list *complete_list,
 192                 struct mei_device *dev,
 193                 struct mei_msg_hdr *mei_hdr)
 194 {
 195         struct mei_cl *cl;
 196         struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
 197         unsigned char *buffer = NULL;
 198
 199         dev_dbg(&dev->pdev->dev, "start client msg\n");
 200         if (list_empty(&dev->read_list.mei_cb.cb_list))
 201                 goto quit;
 202
 203         list_for_each_entry_safe(cb_pos, cb_next,
 204                         &dev->read_list.mei_cb.cb_list, cb_list) {
 205                 cl = (struct mei_cl *)cb_pos->file_private;
 206                 if (cl && _mei_irq_thread_state_ok(cl, mei_hdr)) {
 207                         cl->reading_state = MEI_READING;
 208                         buffer = cb_pos->response_buffer.data + cb_pos->buf_idx;
 209
 210                         if (cb_pos->response_buffer.size <
 211                                         mei_hdr->length + cb_pos->buf_idx) {
 212                                 dev_dbg(&dev->pdev->dev, "message overflow.\n");
 213                                 list_del(&cb_pos->cb_list);
 214                                 return -ENOMEM;
 215                         }
 216                         if (buffer)
 217                                 mei_read_slots(dev, buffer, mei_hdr->length);
 218
 219                         cb_pos->buf_idx += mei_hdr->length;
 220                         if (mei_hdr->msg_complete) {
 221                                 cl->status = 0;
 222                                 list_del(&cb_pos->cb_list);
 223                                 dev_dbg(&dev->pdev->dev,
 224                                         "completed read H cl = %d, ME cl = %d, length = %lu\n",
 225                                         cl->host_client_id,
 226                                         cl->me_client_id,
 227                                         cb_pos->buf_idx);
 228
 229                                 list_add_tail(&cb_pos->cb_list,
 230                                         &complete_list->mei_cb.cb_list);
 231                         }
 232
 233                         break;
 234                 }
 235
 236         }
 237
 238 quit:
 239         dev_dbg(&dev->pdev->dev, "message read\n");
 240         if (!buffer) {
 241                 mei_read_slots(dev, dev->rd_msg_buf, mei_hdr->length);
 242                 dev_dbg(&dev->pdev->dev, "discarding message, header =%08x.\n",
 243                                 *(u32 *) dev->rd_msg_buf);
 244         }
 245
 246         return 0;
 247 }
 248
 249 /**
 250  * _mei_irq_thread_iamthif_read - prepares to read iamthif data.
 251  *
 252  * @dev: the device structure.
 253  * @slots: free slots.
 254  *
 255  * returns 0, OK; otherwise, error.
 256  */
 257 static int _mei_irq_thread_iamthif_read(struct mei_device *dev, s32 *slots)
 258 {
 259
 260         if (((*slots) * sizeof(u32)) < (sizeof(struct mei_msg_hdr)
 261                         + sizeof(struct hbm_flow_control))) {
 262                 return -EMSGSIZE;
 263         }
 264         *slots -= mei_data2slots(sizeof(struct hbm_flow_control));
 265         if (mei_send_flow_control(dev, &dev->iamthif_cl)) {
 266                 dev_dbg(&dev->pdev->dev, "iamthif flow control failed\n");
 267                 return -EIO;
 268         }
 269
 270         dev_dbg(&dev->pdev->dev, "iamthif flow control success\n");
 271         dev->iamthif_state = MEI_IAMTHIF_READING;
 272         dev->iamthif_flow_control_pending = false;
 273         dev->iamthif_msg_buf_index = 0;
 274         dev->iamthif_msg_buf_size = 0;
 275         dev->iamthif_stall_timer = IAMTHIF_STALL_TIMER;
 276         dev->mei_host_buffer_is_empty = mei_hbuf_is_empty(dev);
 277         return 0;
 278 }
 279
 280 /**
 281  * _mei_irq_thread_close - processes close related operation.
 282  *
 283  * @dev: the device structure.
 284  * @slots: free slots.
 285  * @cb_pos: callback block.
 286  * @cl: private data of the file object.
 287  * @cmpl_list: complete list.
 288  *
 289  * returns 0, OK; otherwise, error.
 290  */
 291 static int _mei_irq_thread_close(struct mei_device *dev, s32 *slots,
 292                                 struct mei_cl_cb *cb_pos,
 293                                 struct mei_cl *cl,
 294                                 struct mei_io_list *cmpl_list)
 295 {
 296         if ((*slots * sizeof(u32)) < (sizeof(struct mei_msg_hdr) +
 297                         sizeof(struct hbm_client_disconnect_request)))
 298                 return -EBADMSG;
 299
 300         *slots -= mei_data2slots(sizeof(struct hbm_client_disconnect_request));
 301
 302         if (mei_disconnect(dev, cl)) {
 303                 cl->status = 0;
 304                 cb_pos->buf_idx = 0;
 305                 list_move_tail(&cb_pos->cb_list,
 306                                 &cmpl_list->mei_cb.cb_list);
 307                 return -EMSGSIZE;
 308         } else {
 309                 cl->state = MEI_FILE_DISCONNECTING;
 310                 cl->status = 0;
 311                 cb_pos->buf_idx = 0;
 312                 list_move_tail(&cb_pos->cb_list,
 313                                 &dev->ctrl_rd_list.mei_cb.cb_list);
 314                 cl->timer_count = MEI_CONNECT_TIMEOUT;
 315         }
 316
 317         return 0;
 318 }
 319
 320 /**
 321  * is_treat_specially_client - checks if the message belongs
 322  * to the file private data.
 323  *
 324  * @cl: private data of the file object
 325  * @rs: connect response bus message
 326  *
 327  */
 328 static bool is_treat_specially_client(struct mei_cl *cl,
 329                 struct hbm_client_connect_response *rs)
 330 {
 331
 332         if (cl->host_client_id == rs->host_addr &&
 333             cl->me_client_id == rs->me_addr) {
 334                 if (!rs->status) {
 335                         cl->state = MEI_FILE_CONNECTED;
 336                         cl->status = 0;
 337
 338                 } else {
 339                         cl->state = MEI_FILE_DISCONNECTED;
 340                         cl->status = -ENODEV;
 341                 }
 342                 cl->timer_count = 0;
 343
 344                 return true;
 345         }
 346         return false;
 347 }
 348
 349 /**
 350  * mei_client_connect_response - connects to response irq routine
 351  *
 352  * @dev: the device structure
 353  * @rs: connect response bus message
 354  */
 355 static void mei_client_connect_response(struct mei_device *dev,
 356                 struct hbm_client_connect_response *rs)
 357 {
 358
 359         struct mei_cl *cl;
 360         struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
 361
 362         dev_dbg(&dev->pdev->dev,
 363                         "connect_response:\n"
 364                         "ME Client = %d\n"
 365                         "Host Client = %d\n"
 366                         "Status = %d\n",
 367                         rs->me_addr,
 368                         rs->host_addr,
 369                         rs->status);
 370
 371         /* if WD or iamthif client treat specially */
 372
 373         if (is_treat_specially_client(&(dev->wd_cl), rs)) {
 374                 dev_dbg(&dev->pdev->dev, "successfully connected to WD client.\n");
 375                 mei_watchdog_register(dev);
 376
 377                 /* next step in the state maching */
 378                 mei_host_init_iamthif(dev);
 379                 return;
 380         }
 381
 382         if (is_treat_specially_client(&(dev->iamthif_cl), rs)) {
 383                 dev->iamthif_state = MEI_IAMTHIF_IDLE;
 384                 return;
 385         }
 386         list_for_each_entry_safe(cb_pos, cb_next,
 387                                 &dev->ctrl_rd_list.mei_cb.cb_list, cb_list) {
 388
 389                 cl = (struct mei_cl *)cb_pos->file_private;
 390                 if (!cl) {
 391                         list_del(&cb_pos->cb_list);
 392                         return;
 393                 }
 394                 if (MEI_IOCTL == cb_pos->major_file_operations) {
 395                         if (is_treat_specially_client(cl, rs)) {
 396                                 list_del(&cb_pos->cb_list);
 397                                 cl->status = 0;
 398                                 cl->timer_count = 0;
 399                                 break;
 400                         }
 401                 }
 402         }
 403 }
 404
 405 /**
 406  * mei_client_disconnect_response - disconnects from response irq routine
 407  *
 408  * @dev: the device structure
 409  * @rs: disconnect response bus message
 410  */
 411 static void mei_client_disconnect_response(struct mei_device *dev,
 412                                         struct hbm_client_connect_response *rs)
 413 {
 414         struct mei_cl *cl;
 415         struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
 416
 417         dev_dbg(&dev->pdev->dev,
 418                         "disconnect_response:\n"
 419                         "ME Client = %d\n"
 420                         "Host Client = %d\n"
 421                         "Status = %d\n",
 422                         rs->me_addr,
 423                         rs->host_addr,
 424                         rs->status);
 425
 426         list_for_each_entry_safe(cb_pos, cb_next,
 427                         &dev->ctrl_rd_list.mei_cb.cb_list, cb_list) {
 428                 cl = (struct mei_cl *)cb_pos->file_private;
 429
 430                 if (!cl) {
 431                         list_del(&cb_pos->cb_list);
 432                         return;
 433                 }
 434
 435                 dev_dbg(&dev->pdev->dev, "list_for_each_entry_safe in ctrl_rd_list.\n");
 436                 if (cl->host_client_id == rs->host_addr &&
 437                     cl->me_client_id == rs->me_addr) {
 438
 439                         list_del(&cb_pos->cb_list);
 440                         if (!rs->status)
 441                                 cl->state = MEI_FILE_DISCONNECTED;
 442
 443                         cl->status = 0;
 444                         cl->timer_count = 0;
 445                         break;
 446                 }
 447         }
 448 }
 449
 450 /**
 451  * same_flow_addr - tells if they have the same address.
 452  *
 453  * @file: private data of the file object.
 454  * @flow: flow control.
 455  *
 456  * returns  !=0, same; 0,not.
 457  */
 458 static int same_flow_addr(struct mei_cl *cl, struct hbm_flow_control *flow)
 459 {
 460         return (cl->host_client_id == flow->host_addr &&
 461                 cl->me_client_id == flow->me_addr);
 462 }
 463
 464 /**
 465  * add_single_flow_creds - adds single buffer credentials.
 466  *
 467  * @file: private data ot the file object.
 468  * @flow: flow control.
 469  */
 470 static void add_single_flow_creds(struct mei_device *dev,
 471                                   struct hbm_flow_control *flow)
 472 {
 473         struct mei_me_client *client;
 474         int i;
 475
 476         for (i = 0; i < dev->me_clients_num; i++) {
 477                 client = &dev->me_clients[i];
 478                 if (client && flow->me_addr == client->client_id) {
 479                         if (client->props.single_recv_buf) {
 480                                 client->mei_flow_ctrl_creds++;
 481                                 dev_dbg(&dev->pdev->dev, "recv flow ctrl msg ME %d (single).\n",
 482                                     flow->me_addr);
 483                                 dev_dbg(&dev->pdev->dev, "flow control credentials =%d.\n",
 484                                     client->mei_flow_ctrl_creds);
 485                         } else {
 486                                 BUG();  /* error in flow control */
 487                         }
 488                 }
 489         }
 490 }
 491
 492 /**
 493  * mei_client_flow_control_response - flow control response irq routine
 494  *
 495  * @dev: the device structure
 496  * @flow_control: flow control response bus message
 497  */
 498 static void mei_client_flow_control_response(struct mei_device *dev,
 499                 struct hbm_flow_control *flow_control)
 500 {
 501         struct mei_cl *cl_pos = NULL;
 502         struct mei_cl *cl_next = NULL;
 503
 504         if (!flow_control->host_addr) {
 505                 /* single receive buffer */
 506                 add_single_flow_creds(dev, flow_control);
 507         } else {
 508                 /* normal connection */
 509                 list_for_each_entry_safe(cl_pos, cl_next,
 510                                 &dev->file_list, link) {
 511                         dev_dbg(&dev->pdev->dev, "list_for_each_entry_safe in file_list\n");
 512
 513                         dev_dbg(&dev->pdev->dev, "cl of host client %d ME client %d.\n",
 514                             cl_pos->host_client_id,
 515                             cl_pos->me_client_id);
 516                         dev_dbg(&dev->pdev->dev, "flow ctrl msg for host %d ME %d.\n",
 517                             flow_control->host_addr,
 518                             flow_control->me_addr);
 519                         if (same_flow_addr(cl_pos, flow_control)) {
 520                                 dev_dbg(&dev->pdev->dev, "recv ctrl msg for host  %d ME %d.\n",
 521                                     flow_control->host_addr,
 522                                     flow_control->me_addr);
 523                                 cl_pos->mei_flow_ctrl_creds++;
 524                                 dev_dbg(&dev->pdev->dev, "flow control credentials = %d.\n",
 525                                     cl_pos->mei_flow_ctrl_creds);
 526                                 break;
 527                         }
 528                 }
 529         }
 530 }
 531
 532 /**
 533  * same_disconn_addr - tells if they have the same address
 534  *
 535  * @file: private data of the file object.
 536  * @disconn: disconnection request.
 537  *
 538  * returns !=0, same; 0,not.
 539  */
 540 static int same_disconn_addr(struct mei_cl *cl,
 541                              struct hbm_client_disconnect_request *disconn)
 542 {
 543         return (cl->host_client_id == disconn->host_addr &&
 544                 cl->me_client_id == disconn->me_addr);
 545 }
 546
 547 /**
 548  * mei_client_disconnect_request - disconnects from request irq routine
 549  *
 550  * @dev: the device structure.
 551  * @disconnect_req: disconnect request bus message.
 552  */
 553 static void mei_client_disconnect_request(struct mei_device *dev,
 554                 struct hbm_client_disconnect_request *disconnect_req)
 555 {
 556         struct mei_msg_hdr *mei_hdr;
 557         struct hbm_client_connect_response *disconnect_res;
 558         struct mei_cl *cl_pos = NULL;
 559         struct mei_cl *cl_next = NULL;
 560
 561         list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
 562                 if (same_disconn_addr(cl_pos, disconnect_req)) {
 563                         dev_dbg(&dev->pdev->dev, "disconnect request host client %d ME client %d.\n",
 564                                         disconnect_req->host_addr,
 565                                         disconnect_req->me_addr);
 566                         cl_pos->state = MEI_FILE_DISCONNECTED;
 567                         cl_pos->timer_count = 0;
 568                         if (cl_pos == &dev->wd_cl)
 569                                 dev->wd_pending = false;
 570                         else if (cl_pos == &dev->iamthif_cl)
 571                                 dev->iamthif_timer = 0;
 572
 573                         /* prepare disconnect response */
 574                         mei_hdr =
 575                                 (struct mei_msg_hdr *) &dev->ext_msg_buf[0];
 576                         mei_hdr->host_addr = 0;
 577                         mei_hdr->me_addr = 0;
 578                         mei_hdr->length =
 579                                 sizeof(struct hbm_client_connect_response);
 580                         mei_hdr->msg_complete = 1;
 581                         mei_hdr->reserved = 0;
 582
 583                         disconnect_res =
 584                                 (struct hbm_client_connect_response *)
 585                                 &dev->ext_msg_buf[1];
 586                         disconnect_res->host_addr = cl_pos->host_client_id;
 587                         disconnect_res->me_addr = cl_pos->me_client_id;
 588                         disconnect_res->hbm_cmd = CLIENT_DISCONNECT_RES_CMD;
 589                         disconnect_res->status = 0;
 590                         dev->extra_write_index = 2;
 591                         break;
 592                 }
 593         }
 594 }
 595
 596
 597 /**
 598  * mei_irq_thread_read_bus_message - bottom half read routine after ISR to
 599  * handle the read bus message cmd processing.
 600  *
 601  * @dev: the device structure
 602  * @mei_hdr: header of bus message
 603  */
 604 static void mei_irq_thread_read_bus_message(struct mei_device *dev,
 605                 struct mei_msg_hdr *mei_hdr)
 606 {
 607         struct mei_bus_message *mei_msg;
 608         struct hbm_host_version_response *version_res;
 609         struct hbm_client_connect_response *connect_res;
 610         struct hbm_client_connect_response *disconnect_res;
 611         struct hbm_flow_control *flow_control;
 612         struct hbm_props_response *props_res;
 613         struct hbm_host_enum_response *enum_res;
 614         struct hbm_client_disconnect_request *disconnect_req;
 615         struct hbm_host_stop_request *host_stop_req;
 616         int res;
 617
 618
 619         /* read the message to our buffer */
 620         BUG_ON(mei_hdr->length >= sizeof(dev->rd_msg_buf));
 621         mei_read_slots(dev, dev->rd_msg_buf, mei_hdr->length);
 622         mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
 623
 624         switch (mei_msg->hbm_cmd) {
 625         case HOST_START_RES_CMD:
 626                 version_res = (struct hbm_host_version_response *) mei_msg;
 627                 if (version_res->host_version_supported) {
 628                         dev->version.major_version = HBM_MAJOR_VERSION;
 629                         dev->version.minor_version = HBM_MINOR_VERSION;
 630                         if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
 631                             dev->init_clients_state == MEI_START_MESSAGE) {
 632                                 dev->init_clients_timer = 0;
 633                                 mei_host_enum_clients_message(dev);
 634                         } else {
 635                                 dev->recvd_msg = false;
 636                                 dev_dbg(&dev->pdev->dev, "IMEI reset due to received host start response bus message.\n");
 637                                 mei_reset(dev, 1);
 638                                 return;
 639                         }
 640                 } else {
 641                         dev->version = version_res->me_max_version;
 642                         /* send stop message */
 643                         mei_hdr = (struct mei_msg_hdr *)&dev->wr_msg_buf[0];
 644                         mei_hdr->host_addr = 0;
 645                         mei_hdr->me_addr = 0;
 646                         mei_hdr->length = sizeof(struct hbm_host_stop_request);
 647                         mei_hdr->msg_complete = 1;
 648                         mei_hdr->reserved = 0;
 649
 650                         host_stop_req = (struct hbm_host_stop_request *)
 651                                                         &dev->wr_msg_buf[1];
 652
 653                         memset(host_stop_req,
 654                                         0,
 655                                         sizeof(struct hbm_host_stop_request));
 656                         host_stop_req->hbm_cmd = HOST_STOP_REQ_CMD;
 657                         host_stop_req->reason = DRIVER_STOP_REQUEST;
 658                         mei_write_message(dev, mei_hdr,
 659                                            (unsigned char *) (host_stop_req),
 660                                            mei_hdr->length);
 661                         dev_dbg(&dev->pdev->dev, "version mismatch.\n");
 662                         return;
 663                 }
 664
 665                 dev->recvd_msg = true;
 666                 dev_dbg(&dev->pdev->dev, "host start response message received.\n");
 667                 break;
 668
 669         case CLIENT_CONNECT_RES_CMD:
 670                 connect_res =
 671                         (struct hbm_client_connect_response *) mei_msg;
 672                 mei_client_connect_response(dev, connect_res);
 673                 dev_dbg(&dev->pdev->dev, "client connect response message received.\n");
 674                 wake_up(&dev->wait_recvd_msg);
 675                 break;
 676
 677         case CLIENT_DISCONNECT_RES_CMD:
 678                 disconnect_res =
 679                         (struct hbm_client_connect_response *) mei_msg;
 680                 mei_client_disconnect_response(dev, disconnect_res);
 681                 dev_dbg(&dev->pdev->dev, "client disconnect response message received.\n");
 682                 wake_up(&dev->wait_recvd_msg);
 683                 break;
 684
 685         case MEI_FLOW_CONTROL_CMD:
 686                 flow_control = (struct hbm_flow_control *) mei_msg;
 687                 mei_client_flow_control_response(dev, flow_control);
 688                 dev_dbg(&dev->pdev->dev, "client flow control response message received.\n");
 689                 break;
 690
 691         case HOST_CLIENT_PROPERTIES_RES_CMD:
 692                 props_res = (struct hbm_props_response *)mei_msg;
 693                 if (props_res->status || !dev->me_clients) {
 694                         dev_dbg(&dev->pdev->dev, "reset due to received host client properties response bus message wrong status.\n");
 695                         mei_reset(dev, 1);
 696                         return;
 697                 }
 698                 if (dev->me_clients[dev->me_client_presentation_num]
 699                                         .client_id == props_res->address) {
 700
 701                         dev->me_clients[dev->me_client_presentation_num].props
 702                                                 = props_res->client_properties;
 703
 704                         if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
 705                             dev->init_clients_state ==
 706                                         MEI_CLIENT_PROPERTIES_MESSAGE) {
 707                                 dev->me_client_index++;
 708                                 dev->me_client_presentation_num++;
 709
 710                                 /** Send Client Properties request **/
 711                                 res = mei_host_client_properties(dev);
 712                                 if (res < 0) {
 713                                         dev_dbg(&dev->pdev->dev, "mei_host_client_properties() failed");
 714                                         return;
 715                                 } else if (!res) {
 716                                         /*
 717                                          * No more clients to send to.
 718                                          * Clear Map for indicating now ME clients
 719                                          * with associated host client
 720                                          */
 721                                         bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
 722                                         dev->open_handle_count = 0;
 723
 724                                         /*
 725                                          * Reserving the first three client IDs
 726                                          * Client Id 0 - Reserved for MEI Bus Message communications
 727                                          * Client Id 1 - Reserved for Watchdog
 728                                          * Client ID 2 - Reserved for AMTHI
 729                                          */
 730                                         bitmap_set(dev->host_clients_map, 0, 3);
 731                                         dev->dev_state = MEI_DEV_ENABLED;
 732
 733                                         /* if wd initialization fails, initialization the AMTHI client,
 734                                          * otherwise the AMTHI client will be initialized after the WD client connect response
 735                                          * will be received
 736                                          */
 737                                         if (mei_wd_host_init(dev))
 738                                                 mei_host_init_iamthif(dev);
 739                                 }
 740
 741                         } else {
 742                                 dev_dbg(&dev->pdev->dev, "reset due to received host client properties response bus message");
 743                                 mei_reset(dev, 1);
 744                                 return;
 745                         }
 746                 } else {
 747                         dev_dbg(&dev->pdev->dev, "reset due to received host client properties response bus message for wrong client ID\n");
 748                         mei_reset(dev, 1);
 749                         return;
 750                 }
 751                 break;
 752
 753         case HOST_ENUM_RES_CMD:
 754                 enum_res = (struct hbm_host_enum_response *) mei_msg;
 755                 memcpy(dev->me_clients_map, enum_res->valid_addresses, 32);
 756                 if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
 757                     dev->init_clients_state == MEI_ENUM_CLIENTS_MESSAGE) {
 758                                 dev->init_clients_timer = 0;
 759                                 dev->me_client_presentation_num = 0;
 760                                 dev->me_client_index = 0;
 761                                 mei_allocate_me_clients_storage(dev);
 762                                 dev->init_clients_state =
 763                                         MEI_CLIENT_PROPERTIES_MESSAGE;
 764                                 mei_host_client_properties(dev);
 765                 } else {
 766                         dev_dbg(&dev->pdev->dev, "reset due to received host enumeration clients response bus message.\n");
 767                         mei_reset(dev, 1);
 768                         return;
 769                 }
 770                 break;
 771
 772         case HOST_STOP_RES_CMD:
 773                 dev->dev_state = MEI_DEV_DISABLED;
 774                 dev_dbg(&dev->pdev->dev, "resetting because of FW stop response.\n");
 775                 mei_reset(dev, 1);
 776                 break;
 777
 778         case CLIENT_DISCONNECT_REQ_CMD:
 779                 /* search for client */
 780                 disconnect_req =
 781                         (struct hbm_client_disconnect_request *) mei_msg;
 782                 mei_client_disconnect_request(dev, disconnect_req);
 783                 break;
 784
 785         case ME_STOP_REQ_CMD:
 786                 /* prepare stop request */
 787                 mei_hdr = (struct mei_msg_hdr *) &dev->ext_msg_buf[0];
 788                 mei_hdr->host_addr = 0;
 789                 mei_hdr->me_addr = 0;
 790                 mei_hdr->length = sizeof(struct hbm_host_stop_request);
 791                 mei_hdr->msg_complete = 1;
 792                 mei_hdr->reserved = 0;
 793                 host_stop_req =
 794                         (struct hbm_host_stop_request *) &dev->ext_msg_buf[1];
 795                 memset(host_stop_req, 0, sizeof(struct hbm_host_stop_request));
 796                 host_stop_req->hbm_cmd = HOST_STOP_REQ_CMD;
 797                 host_stop_req->reason = DRIVER_STOP_REQUEST;
 798                 host_stop_req->reserved[0] = 0;
 799                 host_stop_req->reserved[1] = 0;
 800                 dev->extra_write_index = 2;
 801                 break;
 802
 803         default:
 804                 BUG();
 805                 break;
 806
 807         }
 808 }
 809
 810
 811 /**
 812  * _mei_hb_read - processes read related operation.
 813  *
 814  * @dev: the device structure.
 815  * @slots: free slots.
 816  * @cb_pos: callback block.
 817  * @cl: private data of the file object.
 818  * @cmpl_list: complete list.
 819  *
 820  * returns 0, OK; otherwise, error.
 821  */
 822 static int _mei_irq_thread_read(struct mei_device *dev, s32 *slots,
 823                         struct mei_cl_cb *cb_pos,
 824                         struct mei_cl *cl,
 825                         struct mei_io_list *cmpl_list)
 826 {
 827         if ((*slots * sizeof(u32)) < (sizeof(struct mei_msg_hdr) +
 828                         sizeof(struct hbm_flow_control))) {
 829                 /* return the cancel routine */
 830                 list_del(&cb_pos->cb_list);
 831                 return -EBADMSG;
 832         }
 833
 834         *slots -= mei_data2slots(sizeof(struct hbm_flow_control));
 835
 836         if (mei_send_flow_control(dev, cl)) {
 837                 cl->status = -ENODEV;
 838                 cb_pos->buf_idx = 0;
 839                 list_move_tail(&cb_pos->cb_list, &cmpl_list->mei_cb.cb_list);
 840                 return -ENODEV;
 841         }
 842         list_move_tail(&cb_pos->cb_list, &dev->read_list.mei_cb.cb_list);
 843
 844         return 0;
 845 }
 846
 847
 848 /**
 849  * _mei_irq_thread_ioctl - processes ioctl related operation.
 850  *
 851  * @dev: the device structure.
 852  * @slots: free slots.
 853  * @cb_pos: callback block.
 854  * @cl: private data of the file object.
 855  * @cmpl_list: complete list.
 856  *
 857  * returns 0, OK; otherwise, error.
 858  */
 859 static int _mei_irq_thread_ioctl(struct mei_device *dev, s32 *slots,
 860                         struct mei_cl_cb *cb_pos,
 861                         struct mei_cl *cl,
 862                         struct mei_io_list *cmpl_list)
 863 {
 864         if ((*slots * sizeof(u32)) < (sizeof(struct mei_msg_hdr) +
 865                         sizeof(struct hbm_client_connect_request))) {
 866                 /* return the cancel routine */
 867                 list_del(&cb_pos->cb_list);
 868                 return -EBADMSG;
 869         }
 870
 871         cl->state = MEI_FILE_CONNECTING;
 872          *slots -= mei_data2slots(sizeof(struct hbm_client_connect_request));
 873         if (mei_connect(dev, cl)) {
 874                 cl->status = -ENODEV;
 875                 cb_pos->buf_idx = 0;
 876                 list_del(&cb_pos->cb_list);
 877                 return -ENODEV;
 878         } else {
 879                 list_move_tail(&cb_pos->cb_list,
 880                         &dev->ctrl_rd_list.mei_cb.cb_list);
 881                 cl->timer_count = MEI_CONNECT_TIMEOUT;
 882         }
 883         return 0;
 884 }
 885
 886 /**
 887  * _mei_irq_thread_cmpl - processes completed and no-iamthif operation.
 888  *
 889  * @dev: the device structure.
 890  * @slots: free slots.
 891  * @cb_pos: callback block.
 892  * @cl: private data of the file object.
 893  * @cmpl_list: complete list.
 894  *
 895  * returns 0, OK; otherwise, error.
 896  */
 897 static int _mei_irq_thread_cmpl(struct mei_device *dev, s32 *slots,
 898                         struct mei_cl_cb *cb_pos,
 899                         struct mei_cl *cl,
 900                         struct mei_io_list *cmpl_list)
 901 {
 902         struct mei_msg_hdr *mei_hdr;
 903
 904         if ((*slots * sizeof(u32)) >= (sizeof(struct mei_msg_hdr) +
 905                         (cb_pos->request_buffer.size - cb_pos->buf_idx))) {
 906                 mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
 907                 mei_hdr->host_addr = cl->host_client_id;
 908                 mei_hdr->me_addr = cl->me_client_id;
 909                 mei_hdr->length = cb_pos->request_buffer.size - cb_pos->buf_idx;
 910                 mei_hdr->msg_complete = 1;
 911                 mei_hdr->reserved = 0;
 912                 dev_dbg(&dev->pdev->dev, "cb_pos->request_buffer.size =%d"
 913                         "mei_hdr->msg_complete = %d\n",
 914                                 cb_pos->request_buffer.size,
 915                                 mei_hdr->msg_complete);
 916                 dev_dbg(&dev->pdev->dev, "cb_pos->buf_idx  =%lu\n",
 917                                 cb_pos->buf_idx);
 918                 dev_dbg(&dev->pdev->dev, "mei_hdr->length  =%d\n",
 919                                 mei_hdr->length);
 920                 *slots -= mei_data2slots(mei_hdr->length);
 921                 if (mei_write_message(dev, mei_hdr,
 922                                 (unsigned char *)
 923                                 (cb_pos->request_buffer.data +
 924                                 cb_pos->buf_idx),
 925                                 mei_hdr->length)) {
 926                         cl->status = -ENODEV;
 927                         list_move_tail(&cb_pos->cb_list,
 928                                 &cmpl_list->mei_cb.cb_list);
 929                         return -ENODEV;
 930                 } else {
 931                         if (mei_flow_ctrl_reduce(dev, cl))
 932                                 return -ENODEV;
 933                         cl->status = 0;
 934                         cb_pos->buf_idx += mei_hdr->length;
 935                         list_move_tail(&cb_pos->cb_list,
 936                                 &dev->write_waiting_list.mei_cb.cb_list);
 937                 }
 938         } else if (*slots == dev->hbuf_depth) {
 939                 /* buffer is still empty */
 940                 mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
 941                 mei_hdr->host_addr = cl->host_client_id;
 942                 mei_hdr->me_addr = cl->me_client_id;
 943                 mei_hdr->length =
 944                         (*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
 945                 mei_hdr->msg_complete = 0;
 946                 mei_hdr->reserved = 0;
 947                 *slots -= mei_data2slots(mei_hdr->length);
 948                 if (mei_write_message(dev, mei_hdr,
 949                                         (unsigned char *)
 950                                         (cb_pos->request_buffer.data +
 951                                         cb_pos->buf_idx),
 952                                         mei_hdr->length)) {
 953                         cl->status = -ENODEV;
 954                         list_move_tail(&cb_pos->cb_list,
 955                                 &cmpl_list->mei_cb.cb_list);
 956                         return -ENODEV;
 957                 } else {
 958                         cb_pos->buf_idx += mei_hdr->length;
 959                         dev_dbg(&dev->pdev->dev,
 960                                         "cb_pos->request_buffer.size =%d"
 961                                         " mei_hdr->msg_complete = %d\n",
 962                                         cb_pos->request_buffer.size,
 963                                         mei_hdr->msg_complete);
 964                         dev_dbg(&dev->pdev->dev, "cb_pos->buf_idx  =%lu\n",
 965                                         cb_pos->buf_idx);
 966                         dev_dbg(&dev->pdev->dev, "mei_hdr->length  =%d\n",
 967                                         mei_hdr->length);
 968                 }
 969                 return -EMSGSIZE;
 970         } else {
 971                 return -EBADMSG;
 972         }
 973
 974         return 0;
 975 }
 976
 977 /**
 978  * _mei_irq_thread_cmpl_iamthif - processes completed iamthif operation.
 979  *
 980  * @dev: the device structure.
 981  * @slots: free slots.
 982  * @cb_pos: callback block.
 983  * @cl: private data of the file object.
 984  * @cmpl_list: complete list.
 985  *
 986  * returns 0, OK; otherwise, error.
 987  */
 988 static int _mei_irq_thread_cmpl_iamthif(struct mei_device *dev, s32 *slots,
 989                         struct mei_cl_cb *cb_pos,
 990                         struct mei_cl *cl,
 991                         struct mei_io_list *cmpl_list)
 992 {
 993         struct mei_msg_hdr *mei_hdr;
 994
 995         if ((*slots * sizeof(u32)) >= (sizeof(struct mei_msg_hdr) +
 996                         dev->iamthif_msg_buf_size -
 997                         dev->iamthif_msg_buf_index)) {
 998                 mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
 999                 mei_hdr->host_addr = cl->host_client_id;
1000                 mei_hdr->me_addr = cl->me_client_id;
1001                 mei_hdr->length = dev->iamthif_msg_buf_size -
1002                         dev->iamthif_msg_buf_index;
1003                 mei_hdr->msg_complete = 1;
1004                 mei_hdr->reserved = 0;
1005
1006                 *slots -= mei_data2slots(mei_hdr->length);
1007
1008                 if (mei_write_message(dev, mei_hdr,
1009                                         (dev->iamthif_msg_buf +
1010                                         dev->iamthif_msg_buf_index),
1011                                         mei_hdr->length)) {
1012                         dev->iamthif_state = MEI_IAMTHIF_IDLE;
1013                         cl->status = -ENODEV;
1014                         list_del(&cb_pos->cb_list);
1015                         return -ENODEV;
1016                 } else {
1017                         if (mei_flow_ctrl_reduce(dev, cl))
1018                                 return -ENODEV;
1019                         dev->iamthif_msg_buf_index += mei_hdr->length;
1020                         cb_pos->buf_idx = dev->iamthif_msg_buf_index;
1021                         cl->status = 0;
1022                         dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
1023                         dev->iamthif_flow_control_pending = true;
1024                         /* save iamthif cb sent to amthi client */
1025                         dev->iamthif_current_cb = cb_pos;
1026                         list_move_tail(&cb_pos->cb_list,
1027                                 &dev->write_waiting_list.mei_cb.cb_list);
1028
1029                 }
1030         } else if (*slots == dev->hbuf_depth) {
1031                 /* buffer is still empty */
1032                 mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
1033                 mei_hdr->host_addr = cl->host_client_id;
1034                 mei_hdr->me_addr = cl->me_client_id;
1035                 mei_hdr->length =
1036                         (*slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
1037                 mei_hdr->msg_complete = 0;
1038                 mei_hdr->reserved = 0;
1039
1040                 *slots -= mei_data2slots(mei_hdr->length);
1041
1042                 if (mei_write_message(dev, mei_hdr,
1043                                         (dev->iamthif_msg_buf +
1044                                         dev->iamthif_msg_buf_index),
1045                                         mei_hdr->length)) {
1046                         cl->status = -ENODEV;
1047                         list_del(&cb_pos->cb_list);
1048                 } else {
1049                         dev->iamthif_msg_buf_index += mei_hdr->length;
1050                 }
1051                 return -EMSGSIZE;
1052         } else {
1053                 return -EBADMSG;
1054         }
1055
1056         return 0;
1057 }
1058
1059 /**
1060  * mei_irq_thread_read_handler - bottom half read routine after ISR to
1061  * handle the read processing.
1062  *
1063  * @cmpl_list: An instance of our list structure
1064  * @dev: the device structure
1065  * @slots: slots to read.
1066  *
1067  * returns 0 on success, <0 on failure.
1068  */
1069 static int mei_irq_thread_read_handler(struct mei_io_list *cmpl_list,
1070                 struct mei_device *dev,
1071                 s32 *slots)
1072 {
1073         struct mei_msg_hdr *mei_hdr;
1074         struct mei_cl *cl_pos = NULL;
1075         struct mei_cl *cl_next = NULL;
1076         int ret = 0;
1077
1078         if (!dev->rd_msg_hdr) {
1079                 dev->rd_msg_hdr = mei_mecbrw_read(dev);
1080                 dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
1081                 (*slots)--;
1082                 dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
1083         }
1084         mei_hdr = (struct mei_msg_hdr *) &dev->rd_msg_hdr;
1085         dev_dbg(&dev->pdev->dev, "mei_hdr->length =%d\n", mei_hdr->length);
1086
1087         if (mei_hdr->reserved || !dev->rd_msg_hdr) {
1088                 dev_dbg(&dev->pdev->dev, "corrupted message header.\n");
1089                 ret = -EBADMSG;
1090                 goto end;
1091         }
1092
1093         if (mei_hdr->host_addr || mei_hdr->me_addr) {
1094                 list_for_each_entry_safe(cl_pos, cl_next,
1095                                         &dev->file_list, link) {
1096                         dev_dbg(&dev->pdev->dev,
1097                                         "list_for_each_entry_safe read host"
1098                                         " client = %d, ME client = %d\n",
1099                                         cl_pos->host_client_id,
1100                                         cl_pos->me_client_id);
1101                         if (cl_pos->host_client_id == mei_hdr->host_addr &&
1102                             cl_pos->me_client_id == mei_hdr->me_addr)
1103                                 break;
1104                 }
1105
1106                 if (&cl_pos->link == &dev->file_list) {
1107                         dev_dbg(&dev->pdev->dev, "corrupted message header\n");
1108                         ret = -EBADMSG;
1109                         goto end;
1110                 }
1111         }
1112         if (((*slots) * sizeof(u32)) < mei_hdr->length) {
1113                 dev_dbg(&dev->pdev->dev,
1114                                 "we can't read the message slots =%08x.\n",
1115                                 *slots);
1116                 /* we can't read the message */
1117                 ret = -ERANGE;
1118                 goto end;
1119         }
1120
1121         /* decide where to read the message too */
1122         if (!mei_hdr->host_addr) {
1123                 dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_bus_message.\n");
1124                 mei_irq_thread_read_bus_message(dev, mei_hdr);
1125                 dev_dbg(&dev->pdev->dev, "end mei_irq_thread_read_bus_message.\n");
1126         } else if (mei_hdr->host_addr == dev->iamthif_cl.host_client_id &&
1127                    (MEI_FILE_CONNECTED == dev->iamthif_cl.state) &&
1128                    (dev->iamthif_state == MEI_IAMTHIF_READING)) {
1129                 dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_iamthif_message.\n");
1130                 dev_dbg(&dev->pdev->dev, "mei_hdr->length =%d\n",
1131                                 mei_hdr->length);
1132                 ret = mei_irq_thread_read_amthi_message(cmpl_list,
1133                                                         dev, mei_hdr);
1134                 if (ret)
1135                         goto end;
1136
1137         } else {
1138                 dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_client_message.\n");
1139                 ret = mei_irq_thread_read_client_message(cmpl_list,
1140                                                          dev, mei_hdr);
1141                 if (ret)
1142                         goto end;
1143
1144         }
1145
1146         /* reset the number of slots and header */
1147         *slots = mei_count_full_read_slots(dev);
1148         dev->rd_msg_hdr = 0;
1149
1150         if (*slots == -EOVERFLOW) {
1151                 /* overflow - reset */
1152                 dev_dbg(&dev->pdev->dev, "resetting due to slots overflow.\n");
1153                 /* set the event since message has been read */
1154                 ret = -ERANGE;
1155                 goto end;
1156         }
1157 end:
1158         return ret;
1159 }
1160
1161
1162 /**
1163  * mei_irq_thread_write_handler - bottom half write routine after
1164  * ISR to handle the write processing.
1165  *
1166  * @cmpl_list: An instance of our list structure
1167  * @dev: the device structure
1168  * @slots: slots to write.
1169  *
1170  * returns 0 on success, <0 on failure.
1171  */
1172 static int mei_irq_thread_write_handler(struct mei_io_list *cmpl_list,
1173                 struct mei_device *dev,
1174                 s32 *slots)
1175 {
1176
1177         struct mei_cl *cl;
1178         struct mei_cl_cb *pos = NULL, *next = NULL;
1179         struct mei_io_list *list;
1180         int ret;
1181
1182         if (!mei_hbuf_is_empty(dev)) {
1183                 dev_dbg(&dev->pdev->dev, "host buffer is not empty.\n");
1184                 return 0;
1185         }
1186         *slots = mei_hbuf_empty_slots(dev);
1187         if (*slots <= 0)
1188                 return -EMSGSIZE;
1189
1190         /* complete all waiting for write CB */
1191         dev_dbg(&dev->pdev->dev, "complete all waiting for write cb.\n");
1192
1193         list = &dev->write_waiting_list;
1194         list_for_each_entry_safe(pos, next, &list->mei_cb.cb_list, cb_list) {
1195                 cl = (struct mei_cl *)pos->file_private;
1196                 if (cl == NULL)
1197                         continue;
1198
1199                 cl->status = 0;
1200                 list_del(&pos->cb_list);
1201                 if (MEI_WRITING == cl->writing_state &&
1202                    (pos->major_file_operations == MEI_WRITE) &&
1203                    (cl != &dev->iamthif_cl)) {
1204                         dev_dbg(&dev->pdev->dev, "MEI WRITE COMPLETE\n");
1205                         cl->writing_state = MEI_WRITE_COMPLETE;
1206                         list_add_tail(&pos->cb_list,
1207                                       &cmpl_list->mei_cb.cb_list);
1208                 }
1209                 if (cl == &dev->iamthif_cl) {
1210                         dev_dbg(&dev->pdev->dev, "check iamthif flow control.\n");
1211                         if (dev->iamthif_flow_control_pending) {
1212                                 ret = _mei_irq_thread_iamthif_read(dev, slots);
1213                                 if (ret)
1214                                         return ret;
1215                         }
1216                 }
1217         }
1218
1219         if (dev->wd_state == MEI_WD_STOPPING) {
1220                 dev->wd_state = MEI_WD_IDLE;
1221                 wake_up_interruptible(&dev->wait_stop_wd);
1222         }
1223
1224         if (dev->extra_write_index) {
1225                 dev_dbg(&dev->pdev->dev, "extra_write_index =%d.\n",
1226                                 dev->extra_write_index);
1227                 mei_write_message(dev,
1228                                 (struct mei_msg_hdr *) &dev->ext_msg_buf[0],
1229                                 (unsigned char *) &dev->ext_msg_buf[1],
1230                                 (dev->extra_write_index - 1) * sizeof(u32));
1231                 *slots -= dev->extra_write_index;
1232                 dev->extra_write_index = 0;
1233         }
1234         if (dev->dev_state == MEI_DEV_ENABLED) {
1235                 if (dev->wd_pending &&
1236                     mei_flow_ctrl_creds(dev, &dev->wd_cl) > 0) {
1237                         if (mei_wd_send(dev))
1238                                 dev_dbg(&dev->pdev->dev, "wd send failed.\n");
1239                         else if (mei_flow_ctrl_reduce(dev, &dev->wd_cl))
1240                                 return -ENODEV;
1241
1242                         dev->wd_pending = false;
1243
1244                         if (dev->wd_state == MEI_WD_RUNNING)
1245                                 *slots -= mei_data2slots(MEI_WD_START_MSG_SIZE);
1246                         else
1247                                 *slots -= mei_data2slots(MEI_WD_STOP_MSG_SIZE);
1248                 }
1249         }
1250
1251         /* complete control write list CB */
1252         dev_dbg(&dev->pdev->dev, "complete control write list cb.\n");
1253         list_for_each_entry_safe(pos, next,
1254                                 &dev->ctrl_wr_list.mei_cb.cb_list, cb_list) {
1255                 cl = (struct mei_cl *) pos->file_private;
1256                 if (!cl) {
1257                         list_del(&pos->cb_list);
1258                         return -ENODEV;
1259                 }
1260                 switch (pos->major_file_operations) {
1261                 case MEI_CLOSE:
1262                         /* send disconnect message */
1263                         ret = _mei_irq_thread_close(dev, slots, pos, cl, cmpl_list);
1264                         if (ret)
1265                                 return ret;
1266
1267                         break;
1268                 case MEI_READ:
1269                         /* send flow control message */
1270                         ret = _mei_irq_thread_read(dev, slots, pos, cl, cmpl_list);
1271                         if (ret)
1272                                 return ret;
1273
1274                         break;
1275                 case MEI_IOCTL:
1276                         /* connect message */
1277                         if (mei_other_client_is_connecting(dev, cl))
1278                                 continue;
1279                         ret = _mei_irq_thread_ioctl(dev, slots, pos, cl, cmpl_list);
1280                         if (ret)
1281                                 return ret;
1282
1283                         break;
1284
1285                 default:
1286                         BUG();
1287                 }
1288
1289         }
1290         /* complete  write list CB */
1291         dev_dbg(&dev->pdev->dev, "complete write list cb.\n");
1292         list_for_each_entry_safe(pos, next,
1293                                 &dev->write_list.mei_cb.cb_list, cb_list) {
1294                 cl = (struct mei_cl *)pos->file_private;
1295                 if (cl == NULL)
1296                         continue;
1297
1298                 if (cl != &dev->iamthif_cl) {
1299                         if (mei_flow_ctrl_creds(dev, cl) <= 0) {
1300                                 dev_dbg(&dev->pdev->dev,
1301                                         "No flow control credentials for client %d, not sending.\n",
1302                                         cl->host_client_id);
1303                                 continue;
1304                         }
1305                         ret = _mei_irq_thread_cmpl(dev, slots, pos,
1306                                                 cl, cmpl_list);
1307                         if (ret)
1308                                 return ret;
1309
1310                 } else if (cl == &dev->iamthif_cl) {
1311                         /* IAMTHIF IOCTL */
1312                         dev_dbg(&dev->pdev->dev, "complete amthi write cb.\n");
1313                         if (mei_flow_ctrl_creds(dev, cl) <= 0) {
1314                                 dev_dbg(&dev->pdev->dev,
1315                                         "No flow control credentials for amthi client %d.\n",
1316                                         cl->host_client_id);
1317                                 continue;
1318                         }
1319                         ret = _mei_irq_thread_cmpl_iamthif(dev, slots, pos,
1320                                                 cl, cmpl_list);
1321                         if (ret)
1322                                 return ret;
1323
1324                 }
1325
1326         }
1327         return 0;
1328 }
1329
1330
1331
1332 /**
1333  * mei_timer - timer function.
1334  *
1335  * @work: pointer to the work_struct structure
1336  *
1337  * NOTE: This function is called by timer interrupt work
1338  */
1339 void mei_timer(struct work_struct *work)
1340 {
1341         unsigned long timeout;
1342         struct mei_cl *cl_pos = NULL;
1343         struct mei_cl *cl_next = NULL;
1344         struct list_head *amthi_complete_list = NULL;
1345         struct mei_cl_cb  *cb_pos = NULL;
1346         struct mei_cl_cb  *cb_next = NULL;
1347
1348         struct mei_device *dev = container_of(work,
1349                                         struct mei_device, timer_work.work);
1350
1351
1352         mutex_lock(&dev->device_lock);
1353         if (dev->dev_state != MEI_DEV_ENABLED) {
1354                 if (dev->dev_state == MEI_DEV_INIT_CLIENTS) {
1355                         if (dev->init_clients_timer) {
1356                                 if (--dev->init_clients_timer == 0) {
1357                                         dev_dbg(&dev->pdev->dev, "IMEI reset due to init clients timeout ,init clients state = %d.\n",
1358                                                 dev->init_clients_state);
1359                                         mei_reset(dev, 1);
1360                                 }
1361                         }
1362                 }
1363                 goto out;
1364         }
1365         /*** connect/disconnect timeouts ***/
1366         list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
1367                 if (cl_pos->timer_count) {
1368                         if (--cl_pos->timer_count == 0) {
1369                                 dev_dbg(&dev->pdev->dev, "HECI reset due to connect/disconnect timeout.\n");
1370                                 mei_reset(dev, 1);
1371                                 goto out;
1372                         }
1373                 }
1374         }
1375
1376         if (dev->iamthif_stall_timer) {
1377                 if (--dev->iamthif_stall_timer == 0) {
1378                         dev_dbg(&dev->pdev->dev, "resetting because of hang to amthi.\n");
1379                         mei_reset(dev, 1);
1380                         dev->iamthif_msg_buf_size = 0;
1381                         dev->iamthif_msg_buf_index = 0;
1382                         dev->iamthif_canceled = false;
1383                         dev->iamthif_ioctl = true;
1384                         dev->iamthif_state = MEI_IAMTHIF_IDLE;
1385                         dev->iamthif_timer = 0;
1386
1387                         if (dev->iamthif_current_cb)
1388                                 mei_free_cb_private(dev->iamthif_current_cb);
1389
1390                         dev->iamthif_file_object = NULL;
1391                         dev->iamthif_current_cb = NULL;
1392                         mei_run_next_iamthif_cmd(dev);
1393                 }
1394         }
1395
1396         if (dev->iamthif_timer) {
1397
1398                 timeout = dev->iamthif_timer +
1399                                 msecs_to_jiffies(IAMTHIF_READ_TIMER);
1400
1401                 dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
1402                                 dev->iamthif_timer);
1403                 dev_dbg(&dev->pdev->dev, "timeout = %ld\n", timeout);
1404                 dev_dbg(&dev->pdev->dev, "jiffies = %ld\n", jiffies);
1405                 if (time_after(jiffies, timeout)) {
1406                         /*
1407                          * User didn't read the AMTHI data on time (15sec)
1408                          * freeing AMTHI for other requests
1409                          */
1410
1411                         dev_dbg(&dev->pdev->dev, "freeing AMTHI for other requests\n");
1412
1413                         amthi_complete_list = &dev->amthi_read_complete_list.
1414                                         mei_cb.cb_list;
1415
1416                         list_for_each_entry_safe(cb_pos, cb_next, amthi_complete_list, cb_list) {
1417
1418                                 cl_pos = cb_pos->file_object->private_data;
1419
1420                                 /* Finding the AMTHI entry. */
1421                                 if (cl_pos == &dev->iamthif_cl)
1422                                         list_del(&cb_pos->cb_list);
1423                         }
1424                         if (dev->iamthif_current_cb)
1425                                 mei_free_cb_private(dev->iamthif_current_cb);
1426
1427                         dev->iamthif_file_object->private_data = NULL;
1428                         dev->iamthif_file_object = NULL;
1429                         dev->iamthif_current_cb = NULL;
1430                         dev->iamthif_timer = 0;
1431                         mei_run_next_iamthif_cmd(dev);
1432
1433                 }
1434         }
1435 out:
1436         schedule_delayed_work(&dev->timer_work, 2 * HZ);
1437         mutex_unlock(&dev->device_lock);
1438 }
1439
1440 /**
1441  *  mei_interrupt_thread_handler - function called after ISR to handle the interrupt
1442  * processing.
1443  *
1444  * @irq: The irq number
1445  * @dev_id: pointer to the device structure
1446  *
1447  * returns irqreturn_t
1448  *
1449  */
1450 irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id)
1451 {
1452         struct mei_device *dev = (struct mei_device *) dev_id;
1453         struct mei_io_list complete_list;
1454         struct mei_cl_cb *cb_pos = NULL, *cb_next = NULL;
1455         struct mei_cl *cl;
1456         s32 slots;
1457         int rets;
1458         bool  bus_message_received;
1459
1460
1461         dev_dbg(&dev->pdev->dev, "function called after ISR to handle the interrupt processing.\n");
1462         /* initialize our complete list */
1463         mutex_lock(&dev->device_lock);
1464         mei_io_list_init(&complete_list);
1465         dev->host_hw_state = mei_hcsr_read(dev);
1466
1467         /* Ack the interrupt here
1468          * In case of MSI we don't go through the quick handler */
1469         if (pci_dev_msi_enabled(dev->pdev))
1470                 mei_reg_write(dev, H_CSR, dev->host_hw_state);
1471
1472         dev->me_hw_state = mei_mecsr_read(dev);
1473
1474         /* check if ME wants a reset */
1475         if ((dev->me_hw_state & ME_RDY_HRA) == 0 &&
1476             dev->dev_state != MEI_DEV_RESETING &&
1477             dev->dev_state != MEI_DEV_INITIALIZING) {
1478                 dev_dbg(&dev->pdev->dev, "FW not ready.\n");
1479                 mei_reset(dev, 1);
1480                 mutex_unlock(&dev->device_lock);
1481                 return IRQ_HANDLED;
1482         }
1483
1484         /*  check if we need to start the dev */
1485         if ((dev->host_hw_state & H_RDY) == 0) {
1486                 if ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA) {
1487                         dev_dbg(&dev->pdev->dev, "we need to start the dev.\n");
1488                         dev->host_hw_state |= (H_IE | H_IG | H_RDY);
1489                         mei_hcsr_set(dev);
1490                         dev->dev_state = MEI_DEV_INIT_CLIENTS;
1491                         dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n");
1492                         /* link is established
1493                          * start sending messages.
1494                          */
1495                         mei_host_start_message(dev);
1496                         mutex_unlock(&dev->device_lock);
1497                         return IRQ_HANDLED;
1498                 } else {
1499                         dev_dbg(&dev->pdev->dev, "FW not ready.\n");
1500                         mutex_unlock(&dev->device_lock);
1501                         return IRQ_HANDLED;
1502                 }
1503         }
1504         /* check slots available for reading */
1505         slots = mei_count_full_read_slots(dev);
1506         dev_dbg(&dev->pdev->dev, "slots =%08x  extra_write_index =%08x.\n",
1507                 slots, dev->extra_write_index);
1508         while (slots > 0 && !dev->extra_write_index) {
1509                 dev_dbg(&dev->pdev->dev, "slots =%08x  extra_write_index =%08x.\n",
1510                                 slots, dev->extra_write_index);
1511                 dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_handler.\n");
1512                 rets = mei_irq_thread_read_handler(&complete_list, dev, &slots);
1513                 if (rets)
1514                         goto end;
1515         }
1516         rets = mei_irq_thread_write_handler(&complete_list, dev, &slots);
1517 end:
1518         dev_dbg(&dev->pdev->dev, "end of bottom half function.\n");
1519         dev->host_hw_state = mei_hcsr_read(dev);
1520         dev->mei_host_buffer_is_empty = mei_hbuf_is_empty(dev);
1521
1522         bus_message_received = false;
1523         if (dev->recvd_msg && waitqueue_active(&dev->wait_recvd_msg)) {
1524                 dev_dbg(&dev->pdev->dev, "received waiting bus message\n");
1525                 bus_message_received = true;
1526         }
1527         mutex_unlock(&dev->device_lock);
1528         if (bus_message_received) {
1529                 dev_dbg(&dev->pdev->dev, "wake up dev->wait_recvd_msg\n");
1530                 wake_up_interruptible(&dev->wait_recvd_msg);
1531                 bus_message_received = false;
1532         }
1533         if (list_empty(&complete_list.mei_cb.cb_list))
1534                 return IRQ_HANDLED;
1535
1536
1537         list_for_each_entry_safe(cb_pos, cb_next,
1538                         &complete_list.mei_cb.cb_list, cb_list) {
1539                 cl = (struct mei_cl *)cb_pos->file_private;
1540                 list_del(&cb_pos->cb_list);
1541                 if (cl) {
1542                         if (cl != &dev->iamthif_cl) {
1543                                 dev_dbg(&dev->pdev->dev, "completing call back.\n");
1544                                 _mei_cmpl(cl, cb_pos);
1545                                 cb_pos = NULL;
1546                         } else if (cl == &dev->iamthif_cl) {
1547                                 _mei_cmpl_iamthif(dev, cb_pos);
1548                         }
1549                 }
1550         }
1551         return IRQ_HANDLED;
1552 }