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 "hw-me.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 -ETIMEDOUT;
 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         dev_dbg(&dev->pdev->dev, "sending flow control host client = %d, ME client = %d\n",
 333                 cl->host_client_id, cl->me_client_id);
 334
 335         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 336 }
 337
 338 /**
 339  * mei_hbm_add_single_flow_creds - adds single buffer credentials.
 340  *
 341  * @dev: the device structure
 342  * @flow: flow control.
 343  */
 344 static void mei_hbm_add_single_flow_creds(struct mei_device *dev,
 345                                   struct hbm_flow_control *flow)
 346 {
 347         struct mei_me_client *client;
 348         int i;
 349
 350         for (i = 0; i < dev->me_clients_num; i++) {
 351                 client = &dev->me_clients[i];
 352                 if (client && flow->me_addr == client->client_id) {
 353                         if (client->props.single_recv_buf) {
 354                                 client->mei_flow_ctrl_creds++;
 355                                 dev_dbg(&dev->pdev->dev, "recv flow ctrl msg ME %d (single).\n",
 356                                     flow->me_addr);
 357                                 dev_dbg(&dev->pdev->dev, "flow control credentials =%d.\n",
 358                                     client->mei_flow_ctrl_creds);
 359                         } else {
 360                                 BUG();  /* error in flow control */
 361                         }
 362                 }
 363         }
 364 }
 365
 366 /**
 367  * mei_hbm_cl_flow_control_res - flow control response from me
 368  *
 369  * @dev: the device structure
 370  * @flow_control: flow control response bus message
 371  */
 372 static void mei_hbm_cl_flow_control_res(struct mei_device *dev,
 373                 struct hbm_flow_control *flow_control)
 374 {
 375         struct mei_cl *cl = NULL;
 376         struct mei_cl *next = NULL;
 377
 378         if (!flow_control->host_addr) {
 379                 /* single receive buffer */
 380                 mei_hbm_add_single_flow_creds(dev, flow_control);
 381                 return;
 382         }
 383
 384         /* normal connection */
 385         list_for_each_entry_safe(cl, next, &dev->file_list, link) {
 386                 if (mei_hbm_cl_addr_equal(cl, flow_control)) {
 387                         cl->mei_flow_ctrl_creds++;
 388                         dev_dbg(&dev->pdev->dev, "flow ctrl msg for host %d ME %d.\n",
 389                                 flow_control->host_addr, flow_control->me_addr);
 390                         dev_dbg(&dev->pdev->dev, "flow control credentials = %d.\n",
 391                                     cl->mei_flow_ctrl_creds);
 392                                 break;
 393                 }
 394         }
 395 }
 396
 397
 398 /**
 399  * mei_hbm_cl_disconnect_req - sends disconnect message to fw.
 400  *
 401  * @dev: the device structure
 402  * @cl: a client to disconnect from
 403  *
 404  * This function returns -EIO on write failure
 405  */
 406 int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
 407 {
 408         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 409         const size_t len = sizeof(struct hbm_client_connect_request);
 410
 411         mei_hbm_hdr(mei_hdr, len);
 412         mei_hbm_cl_hdr(cl, CLIENT_DISCONNECT_REQ_CMD, dev->wr_msg.data, len);
 413
 414         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 415 }
 416
 417 /**
 418  * mei_hbm_cl_disconnect_rsp - sends disconnect respose to the FW
 419  *
 420  * @dev: the device structure
 421  * @cl: a client to disconnect from
 422  *
 423  * This function returns -EIO on write failure
 424  */
 425 int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
 426 {
 427         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 428         const size_t len = sizeof(struct hbm_client_connect_response);
 429
 430         mei_hbm_hdr(mei_hdr, len);
 431         mei_hbm_cl_hdr(cl, CLIENT_DISCONNECT_RES_CMD, dev->wr_msg.data, len);
 432
 433         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 434 }
 435
 436 /**
 437  * mei_hbm_cl_disconnect_res - disconnect response from ME
 438  *
 439  * @dev: the device structure
 440  * @rs: disconnect response bus message
 441  */
 442 static void mei_hbm_cl_disconnect_res(struct mei_device *dev,
 443                 struct hbm_client_connect_response *rs)
 444 {
 445         struct mei_cl *cl;
 446         struct mei_cl_cb *cb, *next;
 447
 448         dev_dbg(&dev->pdev->dev, "hbm: disconnect response cl:host=%02d me=%02d status=%d\n",
 449                         rs->me_addr, rs->host_addr, rs->status);
 450
 451         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list.list, list) {
 452                 cl = cb->cl;
 453
 454                 /* this should not happen */
 455                 if (WARN_ON(!cl)) {
 456                         list_del(&cb->list);
 457                         return;
 458                 }
 459
 460                 if (mei_hbm_cl_addr_equal(cl, rs)) {
 461                         list_del(&cb->list);
 462                         if (rs->status == MEI_CL_DISCONN_SUCCESS)
 463                                 cl->state = MEI_FILE_DISCONNECTED;
 464
 465                         cl->status = 0;
 466                         cl->timer_count = 0;
 467                         break;
 468                 }
 469         }
 470 }
 471
 472 /**
 473  * mei_hbm_cl_connect_req - send connection request to specific me client
 474  *
 475  * @dev: the device structure
 476  * @cl: a client to connect to
 477  *
 478  * returns -EIO on write failure
 479  */
 480 int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
 481 {
 482         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 483         const size_t len = sizeof(struct hbm_client_connect_request);
 484
 485         mei_hbm_hdr(mei_hdr, len);
 486         mei_hbm_cl_hdr(cl, CLIENT_CONNECT_REQ_CMD, dev->wr_msg.data, len);
 487
 488         return mei_write_message(dev, mei_hdr,  dev->wr_msg.data);
 489 }
 490
 491 /**
 492  * mei_hbm_cl_connect_res - connect response from the ME
 493  *
 494  * @dev: the device structure
 495  * @rs: connect response bus message
 496  */
 497 static void mei_hbm_cl_connect_res(struct mei_device *dev,
 498                 struct hbm_client_connect_response *rs)
 499 {
 500
 501         struct mei_cl *cl;
 502         struct mei_cl_cb *cb, *next;
 503
 504         dev_dbg(&dev->pdev->dev, "hbm: connect response cl:host=%02d me=%02d status=%s\n",
 505                         rs->me_addr, rs->host_addr,
 506                         mei_cl_conn_status_str(rs->status));
 507
 508         cl = NULL;
 509
 510         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list.list, list) {
 511
 512                 cl = cb->cl;
 513                 /* this should not happen */
 514                 if (WARN_ON(!cl)) {
 515                         list_del_init(&cb->list);
 516                         continue;
 517                 }
 518
 519                 if (cb->fop_type !=  MEI_FOP_CONNECT)
 520                         continue;
 521
 522                 if (mei_hbm_cl_addr_equal(cl, rs)) {
 523                         list_del(&cb->list);
 524                         break;
 525                 }
 526         }
 527
 528         if (!cl)
 529                 return;
 530
 531         cl->timer_count = 0;
 532         if (rs->status == MEI_CL_CONN_SUCCESS)
 533                 cl->state = MEI_FILE_CONNECTED;
 534         else
 535                 cl->state = MEI_FILE_DISCONNECTED;
 536         cl->status = mei_cl_conn_status_to_errno(rs->status);
 537 }
 538
 539
 540 /**
 541  * mei_hbm_fw_disconnect_req - disconnect request initiated by ME firmware
 542  *  host sends disconnect response
 543  *
 544  * @dev: the device structure.
 545  * @disconnect_req: disconnect request bus message from the me
 546  *
 547  * returns -ENOMEM on allocation failure
 548  */
 549 static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
 550                 struct hbm_client_connect_request *disconnect_req)
 551 {
 552         struct mei_cl *cl, *next;
 553         struct mei_cl_cb *cb;
 554
 555         list_for_each_entry_safe(cl, next, &dev->file_list, link) {
 556                 if (mei_hbm_cl_addr_equal(cl, disconnect_req)) {
 557                         dev_dbg(&dev->pdev->dev, "disconnect request host client %d ME client %d.\n",
 558                                         disconnect_req->host_addr,
 559                                         disconnect_req->me_addr);
 560                         cl->state = MEI_FILE_DISCONNECTED;
 561                         cl->timer_count = 0;
 562
 563                         cb = mei_io_cb_init(cl, NULL);
 564                         if (!cb)
 565                                 return -ENOMEM;
 566                         cb->fop_type = MEI_FOP_DISCONNECT_RSP;
 567                         cl_dbg(dev, cl, "add disconnect response as first\n");
 568                         list_add(&cb->list, &dev->ctrl_wr_list.list);
 569
 570                         break;
 571                 }
 572         }
 573         return 0;
 574 }
 575
 576
 577 /**
 578  * mei_hbm_version_is_supported - checks whether the driver can
 579  *     support the hbm version of the device
 580  *
 581  * @dev: the device structure
 582  * returns true if driver can support hbm version of the device
 583  */
 584 bool mei_hbm_version_is_supported(struct mei_device *dev)
 585 {
 586         return  (dev->version.major_version < HBM_MAJOR_VERSION) ||
 587                 (dev->version.major_version == HBM_MAJOR_VERSION &&
 588                  dev->version.minor_version <= HBM_MINOR_VERSION);
 589 }
 590
 591 /**
 592  * mei_hbm_dispatch - bottom half read routine after ISR to
 593  * handle the read bus message cmd processing.
 594  *
 595  * @dev: the device structure
 596  * @mei_hdr: header of bus message
 597  *
 598  * returns 0 on success and < 0 on failure
 599  */
 600 int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
 601 {
 602         struct mei_bus_message *mei_msg;
 603         struct mei_me_client *me_client;
 604         struct hbm_host_version_response *version_res;
 605         struct hbm_client_connect_response *connect_res;
 606         struct hbm_client_connect_response *disconnect_res;
 607         struct hbm_client_connect_request *disconnect_req;
 608         struct hbm_flow_control *flow_control;
 609         struct hbm_props_response *props_res;
 610         struct hbm_host_enum_response *enum_res;
 611
 612         /* read the message to our buffer */
 613         BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
 614         mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
 615         mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
 616
 617         /* ignore spurious message and prevent reset nesting
 618          * hbm is put to idle during system reset
 619          */
 620         if (dev->hbm_state == MEI_HBM_IDLE) {
 621                 dev_dbg(&dev->pdev->dev, "hbm: state is idle ignore spurious messages\n");
 622                 return 0;
 623         }
 624
 625         switch (mei_msg->hbm_cmd) {
 626         case HOST_START_RES_CMD:
 627                 dev_dbg(&dev->pdev->dev, "hbm: start: response message received.\n");
 628
 629                 dev->init_clients_timer = 0;
 630
 631                 version_res = (struct hbm_host_version_response *)mei_msg;
 632
 633                 dev_dbg(&dev->pdev->dev, "HBM VERSION: DRIVER=%02d:%02d DEVICE=%02d:%02d\n",
 634                                 HBM_MAJOR_VERSION, HBM_MINOR_VERSION,
 635                                 version_res->me_max_version.major_version,
 636                                 version_res->me_max_version.minor_version);
 637
 638                 if (version_res->host_version_supported) {
 639                         dev->version.major_version = HBM_MAJOR_VERSION;
 640                         dev->version.minor_version = HBM_MINOR_VERSION;
 641                 } else {
 642                         dev->version.major_version =
 643                                 version_res->me_max_version.major_version;
 644                         dev->version.minor_version =
 645                                 version_res->me_max_version.minor_version;
 646                 }
 647
 648                 if (!mei_hbm_version_is_supported(dev)) {
 649                         dev_warn(&dev->pdev->dev, "hbm: start: version mismatch - stopping the driver.\n");
 650
 651                         dev->hbm_state = MEI_HBM_STOPPED;
 652                         if (mei_hbm_stop_req(dev)) {
 653                                 dev_err(&dev->pdev->dev, "hbm: start: failed to send stop request\n");
 654                                 return -EIO;
 655                         }
 656                         break;
 657                 }
 658
 659                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 660                     dev->hbm_state != MEI_HBM_START) {
 661                         dev_err(&dev->pdev->dev, "hbm: start: state mismatch, [%d, %d]\n",
 662                                 dev->dev_state, dev->hbm_state);
 663                         return -EPROTO;
 664                 }
 665
 666                 dev->hbm_state = MEI_HBM_STARTED;
 667
 668                 if (mei_hbm_enum_clients_req(dev)) {
 669                         dev_err(&dev->pdev->dev, "hbm: start: failed to send enumeration request\n");
 670                         return -EIO;
 671                 }
 672
 673                 wake_up_interruptible(&dev->wait_recvd_msg);
 674                 break;
 675
 676         case CLIENT_CONNECT_RES_CMD:
 677                 dev_dbg(&dev->pdev->dev, "hbm: client connect response: message received.\n");
 678
 679                 connect_res = (struct hbm_client_connect_response *) mei_msg;
 680                 mei_hbm_cl_connect_res(dev, connect_res);
 681                 wake_up(&dev->wait_recvd_msg);
 682                 break;
 683
 684         case CLIENT_DISCONNECT_RES_CMD:
 685                 dev_dbg(&dev->pdev->dev, "hbm: client disconnect response: message received.\n");
 686
 687                 disconnect_res = (struct hbm_client_connect_response *) mei_msg;
 688                 mei_hbm_cl_disconnect_res(dev, disconnect_res);
 689                 wake_up(&dev->wait_recvd_msg);
 690                 break;
 691
 692         case MEI_FLOW_CONTROL_CMD:
 693                 dev_dbg(&dev->pdev->dev, "hbm: client flow control response: message received.\n");
 694
 695                 flow_control = (struct hbm_flow_control *) mei_msg;
 696                 mei_hbm_cl_flow_control_res(dev, flow_control);
 697                 break;
 698
 699         case HOST_CLIENT_PROPERTIES_RES_CMD:
 700                 dev_dbg(&dev->pdev->dev, "hbm: properties response: message received.\n");
 701
 702                 dev->init_clients_timer = 0;
 703
 704                 if (dev->me_clients == NULL) {
 705                         dev_err(&dev->pdev->dev, "hbm: properties response: mei_clients not allocated\n");
 706                         return -EPROTO;
 707                 }
 708
 709                 props_res = (struct hbm_props_response *)mei_msg;
 710                 me_client = &dev->me_clients[dev->me_client_presentation_num];
 711
 712                 if (props_res->status) {
 713                         dev_err(&dev->pdev->dev, "hbm: properties response: wrong status = %d\n",
 714                                 props_res->status);
 715                         return -EPROTO;
 716                 }
 717
 718                 if (me_client->client_id != props_res->address) {
 719                         dev_err(&dev->pdev->dev, "hbm: properties response: address mismatch %d ?= %d\n",
 720                                 me_client->client_id, props_res->address);
 721                         return -EPROTO;
 722                 }
 723
 724                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 725                     dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
 726                         dev_err(&dev->pdev->dev, "hbm: properties response: state mismatch, [%d, %d]\n",
 727                                 dev->dev_state, dev->hbm_state);
 728                         return -EPROTO;
 729                 }
 730
 731                 me_client->props = props_res->client_properties;
 732                 dev->me_client_index++;
 733                 dev->me_client_presentation_num++;
 734
 735                 /* request property for the next client */
 736                 if (mei_hbm_prop_req(dev))
 737                         return -EIO;
 738
 739                 break;
 740
 741         case HOST_ENUM_RES_CMD:
 742                 dev_dbg(&dev->pdev->dev, "hbm: enumeration response: message received\n");
 743
 744                 dev->init_clients_timer = 0;
 745
 746                 enum_res = (struct hbm_host_enum_response *) mei_msg;
 747                 BUILD_BUG_ON(sizeof(dev->me_clients_map)
 748                                 < sizeof(enum_res->valid_addresses));
 749                 memcpy(dev->me_clients_map, enum_res->valid_addresses,
 750                         sizeof(enum_res->valid_addresses));
 751
 752                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 753                     dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
 754                         dev_err(&dev->pdev->dev, "hbm: enumeration response: state mismatch, [%d, %d]\n",
 755                                 dev->dev_state, dev->hbm_state);
 756                         return -EPROTO;
 757                 }
 758
 759                 if (mei_hbm_me_cl_allocate(dev)) {
 760                         dev_err(&dev->pdev->dev, "hbm: enumeration response: cannot allocate clients array\n");
 761                         return -ENOMEM;
 762                 }
 763
 764                 dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
 765
 766                 /* first property request */
 767                 if (mei_hbm_prop_req(dev))
 768                         return -EIO;
 769
 770                 break;
 771
 772         case HOST_STOP_RES_CMD:
 773                 dev_dbg(&dev->pdev->dev, "hbm: stop response: message received\n");
 774
 775                 dev->init_clients_timer = 0;
 776
 777                 if (dev->hbm_state != MEI_HBM_STOPPED) {
 778                         dev_err(&dev->pdev->dev, "hbm: stop response: state mismatch, [%d, %d]\n",
 779                                 dev->dev_state, dev->hbm_state);
 780                         return -EPROTO;
 781                 }
 782
 783                 dev->dev_state = MEI_DEV_POWER_DOWN;
 784                 dev_info(&dev->pdev->dev, "hbm: stop response: resetting.\n");
 785                 /* force the reset */
 786                 return -EPROTO;
 787                 break;
 788
 789         case CLIENT_DISCONNECT_REQ_CMD:
 790                 dev_dbg(&dev->pdev->dev, "hbm: disconnect request: message received\n");
 791
 792                 disconnect_req = (struct hbm_client_connect_request *)mei_msg;
 793                 mei_hbm_fw_disconnect_req(dev, disconnect_req);
 794                 break;
 795
 796         case ME_STOP_REQ_CMD:
 797                 dev_dbg(&dev->pdev->dev, "hbm: stop request: message received\n");
 798                 dev->hbm_state = MEI_HBM_STOPPED;
 799                 if (mei_hbm_stop_req(dev)) {
 800                         dev_err(&dev->pdev->dev, "hbm: start: failed to send stop request\n");
 801                         return -EIO;
 802                 }
 803                 break;
 804         default:
 805                 BUG();
 806                 break;
 807
 808         }
 809         return 0;
 810 }
 811