drivers/misc/mei/hbm.c

   1 /*
   2  *
   3  * Intel Management Engine Interface (Intel MEI) Linux driver
   4  * Copyright (c) 2003-2012, Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  */
  16
  17 #include <linux/pci.h>
  18 #include <linux/sched.h>
  19 #include <linux/wait.h>
  20 #include <linux/mei.h>
  21
  22 #include "mei_dev.h"
  23 #include "hbm.h"
  24 #include "client.h"
  25
  26 static const char *mei_cl_conn_status_str(enum mei_cl_connect_status status)
  27 {
  28 #define MEI_CL_CS(status) case MEI_CL_CONN_##status: return #status
  29         switch (status) {
  30         MEI_CL_CS(SUCCESS);
  31         MEI_CL_CS(NOT_FOUND);
  32         MEI_CL_CS(ALREADY_STARTED);
  33         MEI_CL_CS(OUT_OF_RESOURCES);
  34         MEI_CL_CS(MESSAGE_SMALL);
  35         default: return "unknown";
  36         }
  37 #undef MEI_CL_CCS
  38 }
  39
  40 /**
  41  * mei_cl_conn_status_to_errno - convert client connect response
  42  * status to error code
  43  *
  44  * @status: client connect response status
  45  *
  46  * returns corresponding error code
  47  */
  48 static int mei_cl_conn_status_to_errno(enum mei_cl_connect_status status)
  49 {
  50         switch (status) {
  51         case MEI_CL_CONN_SUCCESS:          return 0;
  52         case MEI_CL_CONN_NOT_FOUND:        return -ENOTTY;
  53         case MEI_CL_CONN_ALREADY_STARTED:  return -EBUSY;
  54         case MEI_CL_CONN_OUT_OF_RESOURCES: return -EBUSY;
  55         case MEI_CL_CONN_MESSAGE_SMALL:    return -EINVAL;
  56         default:                           return -EINVAL;
  57         }
  58 }
  59
  60 /**
  61  * mei_hbm_me_cl_allocate - allocates storage for me clients
  62  *
  63  * @dev: the device structure
  64  *
  65  * returns 0 on success -ENOMEM on allocation failure
  66  */
  67 static int mei_hbm_me_cl_allocate(struct mei_device *dev)
  68 {
  69         struct mei_me_client *clients;
  70         int b;
  71
  72         dev->me_clients_num = 0;
  73         dev->me_client_presentation_num = 0;
  74         dev->me_client_index = 0;
  75
  76         /* count how many ME clients we have */
  77         for_each_set_bit(b, dev->me_clients_map, MEI_CLIENTS_MAX)
  78                 dev->me_clients_num++;
  79
  80         if (dev->me_clients_num == 0)
  81                 return 0;
  82
  83         kfree(dev->me_clients);
  84         dev->me_clients = NULL;
  85
  86         dev_dbg(&dev->pdev->dev, "memory allocation for ME clients size=%ld.\n",
  87                 dev->me_clients_num * sizeof(struct mei_me_client));
  88         /* allocate storage for ME clients representation */
  89         clients = kcalloc(dev->me_clients_num,
  90                         sizeof(struct mei_me_client), GFP_KERNEL);
  91         if (!clients) {
  92                 dev_err(&dev->pdev->dev, "memory allocation for ME clients failed.\n");
  93                 return -ENOMEM;
  94         }
  95         dev->me_clients = clients;
  96         return 0;
  97 }
  98
  99 /**
 100  * mei_hbm_cl_hdr - construct client hbm header
 101  *
 102  * @cl: - client
 103  * @hbm_cmd: host bus message command
 104  * @buf: buffer for cl header
 105  * @len: buffer length
 106  */
 107 static inline
 108 void mei_hbm_cl_hdr(struct mei_cl *cl, u8 hbm_cmd, void *buf, size_t len)
 109 {
 110         struct mei_hbm_cl_cmd *cmd = buf;
 111
 112         memset(cmd, 0, len);
 113
 114         cmd->hbm_cmd = hbm_cmd;
 115         cmd->host_addr = cl->host_client_id;
 116         cmd->me_addr = cl->me_client_id;
 117 }
 118
 119 /**
 120  * mei_hbm_cl_addr_equal - tells if they have the same address
 121  *
 122  * @cl: - client
 123  * @buf: buffer with cl header
 124  *
 125  * returns true if addresses are the same
 126  */
 127 static inline
 128 bool mei_hbm_cl_addr_equal(struct mei_cl *cl, void *buf)
 129 {
 130         struct mei_hbm_cl_cmd *cmd = buf;
 131         return cl->host_client_id == cmd->host_addr &&
 132                 cl->me_client_id == cmd->me_addr;
 133 }
 134
 135
 136 /**
 137  * mei_hbm_idle - set hbm to idle state
 138  *
 139  * @dev: the device structure
 140  */
 141 void mei_hbm_idle(struct mei_device *dev)
 142 {
 143         dev->init_clients_timer = 0;
 144         dev->hbm_state = MEI_HBM_IDLE;
 145 }
 146
 147 int mei_hbm_start_wait(struct mei_device *dev)
 148 {
 149         int ret;
 150         if (dev->hbm_state > MEI_HBM_START)
 151                 return 0;
 152
 153         mutex_unlock(&dev->device_lock);
 154         ret = wait_event_interruptible_timeout(dev->wait_recvd_msg,
 155                         dev->hbm_state == MEI_HBM_IDLE ||
 156                         dev->hbm_state >= MEI_HBM_STARTED,
 157                         mei_secs_to_jiffies(MEI_HBM_TIMEOUT));
 158         mutex_lock(&dev->device_lock);
 159
 160         if (ret <= 0 && (dev->hbm_state <= MEI_HBM_START)) {
 161                 dev->hbm_state = MEI_HBM_IDLE;
 162                 dev_err(&dev->pdev->dev, "waiting for mei start failed\n");
 163                 return -ETIME;
 164         }
 165         return 0;
 166 }
 167
 168 /**
 169  * mei_hbm_start_req - sends start request message.
 170  *
 171  * @dev: the device structure
 172  *
 173  * returns 0 on success and < 0 on failure
 174  */
 175 int mei_hbm_start_req(struct mei_device *dev)
 176 {
 177         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 178         struct hbm_host_version_request *start_req;
 179         const size_t len = sizeof(struct hbm_host_version_request);
 180         int ret;
 181
 182         mei_hbm_hdr(mei_hdr, len);
 183
 184         /* host start message */
 185         start_req = (struct hbm_host_version_request *)dev->wr_msg.data;
 186         memset(start_req, 0, len);
 187         start_req->hbm_cmd = HOST_START_REQ_CMD;
 188         start_req->host_version.major_version = HBM_MAJOR_VERSION;
 189         start_req->host_version.minor_version = HBM_MINOR_VERSION;
 190
 191         dev->hbm_state = MEI_HBM_IDLE;
 192         ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 193         if (ret) {
 194                 dev_err(&dev->pdev->dev, "version message write failed: ret = %d\n",
 195                         ret);
 196                 return ret;
 197         }
 198
 199         dev->hbm_state = MEI_HBM_START;
 200         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 201         return 0;
 202 }
 203
 204 /*
 205  * mei_hbm_enum_clients_req - sends enumeration client request message.
 206  *
 207  * @dev: the device structure
 208  *
 209  * returns 0 on success and < 0 on failure
 210  */
 211 static int mei_hbm_enum_clients_req(struct mei_device *dev)
 212 {
 213         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 214         struct hbm_host_enum_request *enum_req;
 215         const size_t len = sizeof(struct hbm_host_enum_request);
 216         int ret;
 217
 218         /* enumerate clients */
 219         mei_hbm_hdr(mei_hdr, len);
 220
 221         enum_req = (struct hbm_host_enum_request *)dev->wr_msg.data;
 222         memset(enum_req, 0, len);
 223         enum_req->hbm_cmd = HOST_ENUM_REQ_CMD;
 224
 225         ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 226         if (ret) {
 227                 dev_err(&dev->pdev->dev, "enumeration request write failed: ret = %d.\n",
 228                         ret);
 229                 return ret;
 230         }
 231         dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
 232         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 233         return 0;
 234 }
 235
 236 /**
 237  * mei_hbm_prop_req - request property for a single client
 238  *
 239  * @dev: the device structure
 240  *
 241  * returns 0 on success and < 0 on failure
 242  */
 243
 244 static int mei_hbm_prop_req(struct mei_device *dev)
 245 {
 246
 247         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 248         struct hbm_props_request *prop_req;
 249         const size_t len = sizeof(struct hbm_props_request);
 250         unsigned long next_client_index;
 251         unsigned long client_num;
 252         int ret;
 253
 254         client_num = dev->me_client_presentation_num;
 255
 256         next_client_index = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX,
 257                                           dev->me_client_index);
 258
 259         /* We got all client properties */
 260         if (next_client_index == MEI_CLIENTS_MAX) {
 261                 dev->hbm_state = MEI_HBM_STARTED;
 262                 schedule_work(&dev->init_work);
 263
 264                 return 0;
 265         }
 266
 267         dev->me_clients[client_num].client_id = next_client_index;
 268         dev->me_clients[client_num].mei_flow_ctrl_creds = 0;
 269
 270         mei_hbm_hdr(mei_hdr, len);
 271         prop_req = (struct hbm_props_request *)dev->wr_msg.data;
 272
 273         memset(prop_req, 0, sizeof(struct hbm_props_request));
 274
 275
 276         prop_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
 277         prop_req->address = next_client_index;
 278
 279         ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 280         if (ret) {
 281                 dev_err(&dev->pdev->dev, "properties request write failed: ret = %d\n",
 282                         ret);
 283                 return ret;
 284         }
 285
 286         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 287         dev->me_client_index = next_client_index;
 288
 289         return 0;
 290 }
 291
 292 /**
 293  * mei_hbm_stop_req - send stop request message
 294  *
 295  * @dev - mei device
 296  * @cl: client info
 297  *
 298  * This function returns -EIO on write failure
 299  */
 300 static int mei_hbm_stop_req(struct mei_device *dev)
 301 {
 302         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 303         struct hbm_host_stop_request *req =
 304                         (struct hbm_host_stop_request *)dev->wr_msg.data;
 305         const size_t len = sizeof(struct hbm_host_stop_request);
 306
 307         mei_hbm_hdr(mei_hdr, len);
 308
 309         memset(req, 0, len);
 310         req->hbm_cmd = HOST_STOP_REQ_CMD;
 311         req->reason = DRIVER_STOP_REQUEST;
 312
 313         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 314 }
 315
 316 /**
 317  * mei_hbm_cl_flow_control_req - sends flow control request.
 318  *
 319  * @dev: the device structure
 320  * @cl: client info
 321  *
 322  * This function returns -EIO on write failure
 323  */
 324 int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
 325 {
 326         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 327         const size_t len = sizeof(struct hbm_flow_control);
 328
 329         mei_hbm_hdr(mei_hdr, len);
 330         mei_hbm_cl_hdr(cl, MEI_FLOW_CONTROL_CMD, dev->wr_msg.data, len);
 331
 332         cl_dbg(dev, cl, "sending flow control\n");
 333
 334         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 335 }
 336
 337 /**
 338  * mei_hbm_add_single_flow_creds - adds single buffer credentials.
 339  *
 340  * @dev: the device structure
 341  * @flow: flow control.
 342  *
 343  * return 0 on success, < 0 otherwise
 344  */
 345 static int mei_hbm_add_single_flow_creds(struct mei_device *dev,
 346                                   struct hbm_flow_control *flow)
 347 {
 348         struct mei_me_client *me_cl;
 349         int id;
 350
 351         id = mei_me_cl_by_id(dev, flow->me_addr);
 352         if (id < 0) {
 353                 dev_err(&dev->pdev->dev, "no such me client %d\n",
 354                         flow->me_addr);
 355                 return id;
 356         }
 357
 358         me_cl = &dev->me_clients[id];
 359         if (me_cl->props.single_recv_buf) {
 360                 me_cl->mei_flow_ctrl_creds++;
 361                 dev_dbg(&dev->pdev->dev, "recv flow ctrl msg ME %d (single).\n",
 362                     flow->me_addr);
 363                 dev_dbg(&dev->pdev->dev, "flow control credentials =%d.\n",
 364                     me_cl->mei_flow_ctrl_creds);
 365         } else {
 366                 BUG();  /* error in flow control */
 367         }
 368
 369         return 0;
 370 }
 371
 372 /**
 373  * mei_hbm_cl_flow_control_res - flow control response from me
 374  *
 375  * @dev: the device structure
 376  * @flow_control: flow control response bus message
 377  */
 378 static void mei_hbm_cl_flow_control_res(struct mei_device *dev,
 379                 struct hbm_flow_control *flow_control)
 380 {
 381         struct mei_cl *cl;
 382
 383         if (!flow_control->host_addr) {
 384                 /* single receive buffer */
 385                 mei_hbm_add_single_flow_creds(dev, flow_control);
 386                 return;
 387         }
 388
 389         /* normal connection */
 390         list_for_each_entry(cl, &dev->file_list, link) {
 391                 if (mei_hbm_cl_addr_equal(cl, flow_control)) {
 392                         cl->mei_flow_ctrl_creds++;
 393                         dev_dbg(&dev->pdev->dev, "flow ctrl msg for host %d ME %d.\n",
 394                                 flow_control->host_addr, flow_control->me_addr);
 395                         dev_dbg(&dev->pdev->dev, "flow control credentials = %d.\n",
 396                                     cl->mei_flow_ctrl_creds);
 397                                 break;
 398                 }
 399         }
 400 }
 401
 402
 403 /**
 404  * mei_hbm_cl_disconnect_req - sends disconnect message to fw.
 405  *
 406  * @dev: the device structure
 407  * @cl: a client to disconnect from
 408  *
 409  * This function returns -EIO on write failure
 410  */
 411 int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
 412 {
 413         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 414         const size_t len = sizeof(struct hbm_client_connect_request);
 415
 416         mei_hbm_hdr(mei_hdr, len);
 417         mei_hbm_cl_hdr(cl, CLIENT_DISCONNECT_REQ_CMD, dev->wr_msg.data, len);
 418
 419         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 420 }
 421
 422 /**
 423  * mei_hbm_cl_disconnect_rsp - sends disconnect respose to the FW
 424  *
 425  * @dev: the device structure
 426  * @cl: a client to disconnect from
 427  *
 428  * This function returns -EIO on write failure
 429  */
 430 int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
 431 {
 432         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 433         const size_t len = sizeof(struct hbm_client_connect_response);
 434
 435         mei_hbm_hdr(mei_hdr, len);
 436         mei_hbm_cl_hdr(cl, CLIENT_DISCONNECT_RES_CMD, dev->wr_msg.data, len);
 437
 438         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 439 }
 440
 441 /**
 442  * mei_hbm_cl_disconnect_res - disconnect response from ME
 443  *
 444  * @dev: the device structure
 445  * @rs: disconnect response bus message
 446  */
 447 static void mei_hbm_cl_disconnect_res(struct mei_device *dev,
 448                 struct hbm_client_connect_response *rs)
 449 {
 450         struct mei_cl *cl;
 451         struct mei_cl_cb *cb, *next;
 452
 453         dev_dbg(&dev->pdev->dev, "hbm: disconnect response cl:host=%02d me=%02d status=%d\n",
 454                         rs->me_addr, rs->host_addr, rs->status);
 455
 456         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list.list, list) {
 457                 cl = cb->cl;
 458
 459                 /* this should not happen */
 460                 if (WARN_ON(!cl)) {
 461                         list_del(&cb->list);
 462                         return;
 463                 }
 464
 465                 if (mei_hbm_cl_addr_equal(cl, rs)) {
 466                         list_del(&cb->list);
 467                         if (rs->status == MEI_CL_DISCONN_SUCCESS)
 468                                 cl->state = MEI_FILE_DISCONNECTED;
 469
 470                         cl->status = 0;
 471                         cl->timer_count = 0;
 472                         break;
 473                 }
 474         }
 475 }
 476
 477 /**
 478  * mei_hbm_cl_connect_req - send connection request to specific me client
 479  *
 480  * @dev: the device structure
 481  * @cl: a client to connect to
 482  *
 483  * returns -EIO on write failure
 484  */
 485 int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
 486 {
 487         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 488         const size_t len = sizeof(struct hbm_client_connect_request);
 489
 490         mei_hbm_hdr(mei_hdr, len);
 491         mei_hbm_cl_hdr(cl, CLIENT_CONNECT_REQ_CMD, dev->wr_msg.data, len);
 492
 493         return mei_write_message(dev, mei_hdr,  dev->wr_msg.data);
 494 }
 495
 496 /**
 497  * mei_hbm_cl_connect_res - connect response from the ME
 498  *
 499  * @dev: the device structure
 500  * @rs: connect response bus message
 501  */
 502 static void mei_hbm_cl_connect_res(struct mei_device *dev,
 503                 struct hbm_client_connect_response *rs)
 504 {
 505
 506         struct mei_cl *cl;
 507         struct mei_cl_cb *cb, *next;
 508
 509         dev_dbg(&dev->pdev->dev, "hbm: connect response cl:host=%02d me=%02d status=%s\n",
 510                         rs->me_addr, rs->host_addr,
 511                         mei_cl_conn_status_str(rs->status));
 512
 513         cl = NULL;
 514
 515         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list.list, list) {
 516
 517                 cl = cb->cl;
 518                 /* this should not happen */
 519                 if (WARN_ON(!cl)) {
 520                         list_del_init(&cb->list);
 521                         continue;
 522                 }
 523
 524                 if (cb->fop_type !=  MEI_FOP_CONNECT)
 525                         continue;
 526
 527                 if (mei_hbm_cl_addr_equal(cl, rs)) {
 528                         list_del(&cb->list);
 529                         break;
 530                 }
 531         }
 532
 533         if (!cl)
 534                 return;
 535
 536         cl->timer_count = 0;
 537         if (rs->status == MEI_CL_CONN_SUCCESS)
 538                 cl->state = MEI_FILE_CONNECTED;
 539         else
 540                 cl->state = MEI_FILE_DISCONNECTED;
 541         cl->status = mei_cl_conn_status_to_errno(rs->status);
 542 }
 543
 544
 545 /**
 546  * mei_hbm_fw_disconnect_req - disconnect request initiated by ME firmware
 547  *  host sends disconnect response
 548  *
 549  * @dev: the device structure.
 550  * @disconnect_req: disconnect request bus message from the me
 551  *
 552  * returns -ENOMEM on allocation failure
 553  */
 554 static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
 555                 struct hbm_client_connect_request *disconnect_req)
 556 {
 557         struct mei_cl *cl;
 558         struct mei_cl_cb *cb;
 559
 560         list_for_each_entry(cl, &dev->file_list, link) {
 561                 if (mei_hbm_cl_addr_equal(cl, disconnect_req)) {
 562                         dev_dbg(&dev->pdev->dev, "disconnect request host client %d ME client %d.\n",
 563                                         disconnect_req->host_addr,
 564                                         disconnect_req->me_addr);
 565                         cl->state = MEI_FILE_DISCONNECTED;
 566                         cl->timer_count = 0;
 567
 568                         cb = mei_io_cb_init(cl, NULL);
 569                         if (!cb)
 570                                 return -ENOMEM;
 571                         cb->fop_type = MEI_FOP_DISCONNECT_RSP;
 572                         cl_dbg(dev, cl, "add disconnect response as first\n");
 573                         list_add(&cb->list, &dev->ctrl_wr_list.list);
 574
 575                         break;
 576                 }
 577         }
 578         return 0;
 579 }
 580
 581
 582 /**
 583  * mei_hbm_version_is_supported - checks whether the driver can
 584  *     support the hbm version of the device
 585  *
 586  * @dev: the device structure
 587  * returns true if driver can support hbm version of the device
 588  */
 589 bool mei_hbm_version_is_supported(struct mei_device *dev)
 590 {
 591         return  (dev->version.major_version < HBM_MAJOR_VERSION) ||
 592                 (dev->version.major_version == HBM_MAJOR_VERSION &&
 593                  dev->version.minor_version <= HBM_MINOR_VERSION);
 594 }
 595
 596 /**
 597  * mei_hbm_dispatch - bottom half read routine after ISR to
 598  * handle the read bus message cmd processing.
 599  *
 600  * @dev: the device structure
 601  * @mei_hdr: header of bus message
 602  *
 603  * returns 0 on success and < 0 on failure
 604  */
 605 int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
 606 {
 607         struct mei_bus_message *mei_msg;
 608         struct mei_me_client *me_client;
 609         struct hbm_host_version_response *version_res;
 610         struct hbm_client_connect_response *connect_res;
 611         struct hbm_client_connect_response *disconnect_res;
 612         struct hbm_client_connect_request *disconnect_req;
 613         struct hbm_flow_control *flow_control;
 614         struct hbm_props_response *props_res;
 615         struct hbm_host_enum_response *enum_res;
 616
 617         /* read the message to our buffer */
 618         BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
 619         mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
 620         mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
 621
 622         /* ignore spurious message and prevent reset nesting
 623          * hbm is put to idle during system reset
 624          */
 625         if (dev->hbm_state == MEI_HBM_IDLE) {
 626                 dev_dbg(&dev->pdev->dev, "hbm: state is idle ignore spurious messages\n");
 627                 return 0;
 628         }
 629
 630         switch (mei_msg->hbm_cmd) {
 631         case HOST_START_RES_CMD:
 632                 dev_dbg(&dev->pdev->dev, "hbm: start: response message received.\n");
 633
 634                 dev->init_clients_timer = 0;
 635
 636                 version_res = (struct hbm_host_version_response *)mei_msg;
 637
 638                 dev_dbg(&dev->pdev->dev, "HBM VERSION: DRIVER=%02d:%02d DEVICE=%02d:%02d\n",
 639                                 HBM_MAJOR_VERSION, HBM_MINOR_VERSION,
 640                                 version_res->me_max_version.major_version,
 641                                 version_res->me_max_version.minor_version);
 642
 643                 if (version_res->host_version_supported) {
 644                         dev->version.major_version = HBM_MAJOR_VERSION;
 645                         dev->version.minor_version = HBM_MINOR_VERSION;
 646                 } else {
 647                         dev->version.major_version =
 648                                 version_res->me_max_version.major_version;
 649                         dev->version.minor_version =
 650                                 version_res->me_max_version.minor_version;
 651                 }
 652
 653                 if (!mei_hbm_version_is_supported(dev)) {
 654                         dev_warn(&dev->pdev->dev, "hbm: start: version mismatch - stopping the driver.\n");
 655
 656                         dev->hbm_state = MEI_HBM_STOPPED;
 657                         if (mei_hbm_stop_req(dev)) {
 658                                 dev_err(&dev->pdev->dev, "hbm: start: failed to send stop request\n");
 659                                 return -EIO;
 660                         }
 661                         break;
 662                 }
 663
 664                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 665                     dev->hbm_state != MEI_HBM_START) {
 666                         dev_err(&dev->pdev->dev, "hbm: start: state mismatch, [%d, %d]\n",
 667                                 dev->dev_state, dev->hbm_state);
 668                         return -EPROTO;
 669                 }
 670
 671                 dev->hbm_state = MEI_HBM_STARTED;
 672
 673                 if (mei_hbm_enum_clients_req(dev)) {
 674                         dev_err(&dev->pdev->dev, "hbm: start: failed to send enumeration request\n");
 675                         return -EIO;
 676                 }
 677
 678                 wake_up_interruptible(&dev->wait_recvd_msg);
 679                 break;
 680
 681         case CLIENT_CONNECT_RES_CMD:
 682                 dev_dbg(&dev->pdev->dev, "hbm: client connect response: message received.\n");
 683
 684                 connect_res = (struct hbm_client_connect_response *) mei_msg;
 685                 mei_hbm_cl_connect_res(dev, connect_res);
 686                 wake_up(&dev->wait_recvd_msg);
 687                 break;
 688
 689         case CLIENT_DISCONNECT_RES_CMD:
 690                 dev_dbg(&dev->pdev->dev, "hbm: client disconnect response: message received.\n");
 691
 692                 disconnect_res = (struct hbm_client_connect_response *) mei_msg;
 693                 mei_hbm_cl_disconnect_res(dev, disconnect_res);
 694                 wake_up(&dev->wait_recvd_msg);
 695                 break;
 696
 697         case MEI_FLOW_CONTROL_CMD:
 698                 dev_dbg(&dev->pdev->dev, "hbm: client flow control response: message received.\n");
 699
 700                 flow_control = (struct hbm_flow_control *) mei_msg;
 701                 mei_hbm_cl_flow_control_res(dev, flow_control);
 702                 break;
 703
 704         case HOST_CLIENT_PROPERTIES_RES_CMD:
 705                 dev_dbg(&dev->pdev->dev, "hbm: properties response: message received.\n");
 706
 707                 dev->init_clients_timer = 0;
 708
 709                 if (dev->me_clients == NULL) {
 710                         dev_err(&dev->pdev->dev, "hbm: properties response: mei_clients not allocated\n");
 711                         return -EPROTO;
 712                 }
 713
 714                 props_res = (struct hbm_props_response *)mei_msg;
 715                 me_client = &dev->me_clients[dev->me_client_presentation_num];
 716
 717                 if (props_res->status) {
 718                         dev_err(&dev->pdev->dev, "hbm: properties response: wrong status = %d\n",
 719                                 props_res->status);
 720                         return -EPROTO;
 721                 }
 722
 723                 if (me_client->client_id != props_res->address) {
 724                         dev_err(&dev->pdev->dev, "hbm: properties response: address mismatch %d ?= %d\n",
 725                                 me_client->client_id, props_res->address);
 726                         return -EPROTO;
 727                 }
 728
 729                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 730                     dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
 731                         dev_err(&dev->pdev->dev, "hbm: properties response: state mismatch, [%d, %d]\n",
 732                                 dev->dev_state, dev->hbm_state);
 733                         return -EPROTO;
 734                 }
 735
 736                 me_client->props = props_res->client_properties;
 737                 dev->me_client_index++;
 738                 dev->me_client_presentation_num++;
 739
 740                 /* request property for the next client */
 741                 if (mei_hbm_prop_req(dev))
 742                         return -EIO;
 743
 744                 break;
 745
 746         case HOST_ENUM_RES_CMD:
 747                 dev_dbg(&dev->pdev->dev, "hbm: enumeration response: message received\n");
 748
 749                 dev->init_clients_timer = 0;
 750
 751                 enum_res = (struct hbm_host_enum_response *) mei_msg;
 752                 BUILD_BUG_ON(sizeof(dev->me_clients_map)
 753                                 < sizeof(enum_res->valid_addresses));
 754                 memcpy(dev->me_clients_map, enum_res->valid_addresses,
 755                         sizeof(enum_res->valid_addresses));
 756
 757                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 758                     dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
 759                         dev_err(&dev->pdev->dev, "hbm: enumeration response: state mismatch, [%d, %d]\n",
 760                                 dev->dev_state, dev->hbm_state);
 761                         return -EPROTO;
 762                 }
 763
 764                 if (mei_hbm_me_cl_allocate(dev)) {
 765                         dev_err(&dev->pdev->dev, "hbm: enumeration response: cannot allocate clients array\n");
 766                         return -ENOMEM;
 767                 }
 768
 769                 dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
 770
 771                 /* first property request */
 772                 if (mei_hbm_prop_req(dev))
 773                         return -EIO;
 774
 775                 break;
 776
 777         case HOST_STOP_RES_CMD:
 778                 dev_dbg(&dev->pdev->dev, "hbm: stop response: message received\n");
 779
 780                 dev->init_clients_timer = 0;
 781
 782                 if (dev->hbm_state != MEI_HBM_STOPPED) {
 783                         dev_err(&dev->pdev->dev, "hbm: stop response: state mismatch, [%d, %d]\n",
 784                                 dev->dev_state, dev->hbm_state);
 785                         return -EPROTO;
 786                 }
 787
 788                 dev->dev_state = MEI_DEV_POWER_DOWN;
 789                 dev_info(&dev->pdev->dev, "hbm: stop response: resetting.\n");
 790                 /* force the reset */
 791                 return -EPROTO;
 792                 break;
 793
 794         case CLIENT_DISCONNECT_REQ_CMD:
 795                 dev_dbg(&dev->pdev->dev, "hbm: disconnect request: message received\n");
 796
 797                 disconnect_req = (struct hbm_client_connect_request *)mei_msg;
 798                 mei_hbm_fw_disconnect_req(dev, disconnect_req);
 799                 break;
 800
 801         case ME_STOP_REQ_CMD:
 802                 dev_dbg(&dev->pdev->dev, "hbm: stop request: message received\n");
 803                 dev->hbm_state = MEI_HBM_STOPPED;
 804                 if (mei_hbm_stop_req(dev)) {
 805                         dev_err(&dev->pdev->dev, "hbm: start: failed to send stop request\n");
 806                         return -EIO;
 807                 }
 808                 break;
 809         default:
 810                 BUG();
 811                 break;
 812
 813         }
 814         return 0;
 815 }
 816