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 #include "client.h"
  26
  27 static const char *mei_cl_conn_status_str(enum mei_cl_connect_status status)
  28 {
  29 #define MEI_CL_CS(status) case MEI_CL_CONN_##status: return #status
  30         switch (status) {
  31         MEI_CL_CS(SUCCESS);
  32         MEI_CL_CS(NOT_FOUND);
  33         MEI_CL_CS(ALREADY_STARTED);
  34         MEI_CL_CS(OUT_OF_RESOURCES);
  35         MEI_CL_CS(MESSAGE_SMALL);
  36         default: return "unknown";
  37         }
  38 #undef MEI_CL_CCS
  39 }
  40
  41 /**
  42  * mei_cl_conn_status_to_errno - convert client connect response
  43  * status to error code
  44  *
  45  * @status: client connect response status
  46  *
  47  * returns corresponding error code
  48  */
  49 static int mei_cl_conn_status_to_errno(enum mei_cl_connect_status status)
  50 {
  51         switch (status) {
  52         case MEI_CL_CONN_SUCCESS:          return 0;
  53         case MEI_CL_CONN_NOT_FOUND:        return -ENOTTY;
  54         case MEI_CL_CONN_ALREADY_STARTED:  return -EBUSY;
  55         case MEI_CL_CONN_OUT_OF_RESOURCES: return -EBUSY;
  56         case MEI_CL_CONN_MESSAGE_SMALL:    return -EINVAL;
  57         default:                           return -EINVAL;
  58         }
  59 }
  60
  61 /**
  62  * mei_hbm_me_cl_allocate - allocates storage for me clients
  63  *
  64  * @dev: the device structure
  65  *
  66  * returns 0 on success -ENOMEM on allocation failure
  67  */
  68 static int mei_hbm_me_cl_allocate(struct mei_device *dev)
  69 {
  70         struct mei_me_client *clients;
  71         int b;
  72
  73         dev->me_clients_num = 0;
  74         dev->me_client_presentation_num = 0;
  75         dev->me_client_index = 0;
  76
  77         /* count how many ME clients we have */
  78         for_each_set_bit(b, dev->me_clients_map, MEI_CLIENTS_MAX)
  79                 dev->me_clients_num++;
  80
  81         if (dev->me_clients_num == 0)
  82                 return 0;
  83
  84         kfree(dev->me_clients);
  85         dev->me_clients = NULL;
  86
  87         dev_dbg(&dev->pdev->dev, "memory allocation for ME clients size=%ld.\n",
  88                 dev->me_clients_num * sizeof(struct mei_me_client));
  89         /* allocate storage for ME clients representation */
  90         clients = kcalloc(dev->me_clients_num,
  91                         sizeof(struct mei_me_client), GFP_KERNEL);
  92         if (!clients) {
  93                 dev_err(&dev->pdev->dev, "memory allocation for ME clients failed.\n");
  94                 return -ENOMEM;
  95         }
  96         dev->me_clients = clients;
  97         return 0;
  98 }
  99
 100 /**
 101  * mei_hbm_cl_hdr - construct client hbm header
 102  *
 103  * @cl: - client
 104  * @hbm_cmd: host bus message command
 105  * @buf: buffer for cl header
 106  * @len: buffer length
 107  */
 108 static inline
 109 void mei_hbm_cl_hdr(struct mei_cl *cl, u8 hbm_cmd, void *buf, size_t len)
 110 {
 111         struct mei_hbm_cl_cmd *cmd = buf;
 112
 113         memset(cmd, 0, len);
 114
 115         cmd->hbm_cmd = hbm_cmd;
 116         cmd->host_addr = cl->host_client_id;
 117         cmd->me_addr = cl->me_client_id;
 118 }
 119
 120 /**
 121  * mei_hbm_cl_addr_equal - tells if they have the same address
 122  *
 123  * @cl: - client
 124  * @buf: buffer with cl header
 125  *
 126  * returns true if addresses are the same
 127  */
 128 static inline
 129 bool mei_hbm_cl_addr_equal(struct mei_cl *cl, void *buf)
 130 {
 131         struct mei_hbm_cl_cmd *cmd = buf;
 132         return cl->host_client_id == cmd->host_addr &&
 133                 cl->me_client_id == cmd->me_addr;
 134 }
 135
 136
 137 /**
 138  * mei_hbm_idle - set hbm to idle state
 139  *
 140  * @dev: the device structure
 141  */
 142 void mei_hbm_idle(struct mei_device *dev)
 143 {
 144         dev->init_clients_timer = 0;
 145         dev->hbm_state = MEI_HBM_IDLE;
 146 }
 147
 148 int mei_hbm_start_wait(struct mei_device *dev)
 149 {
 150         int ret;
 151         if (dev->hbm_state > MEI_HBM_START)
 152                 return 0;
 153
 154         mutex_unlock(&dev->device_lock);
 155         ret = wait_event_interruptible_timeout(dev->wait_recvd_msg,
 156                         dev->hbm_state == MEI_HBM_IDLE ||
 157                         dev->hbm_state >= MEI_HBM_STARTED,
 158                         mei_secs_to_jiffies(MEI_HBM_TIMEOUT));
 159         mutex_lock(&dev->device_lock);
 160
 161         if (ret <= 0 && (dev->hbm_state <= MEI_HBM_START)) {
 162                 dev->hbm_state = MEI_HBM_IDLE;
 163                 dev_err(&dev->pdev->dev, "waiting for mei start failed\n");
 164                 return -ETIME;
 165         }
 166         return 0;
 167 }
 168
 169 /**
 170  * mei_hbm_start_req - sends start request message.
 171  *
 172  * @dev: the device structure
 173  *
 174  * returns 0 on success and < 0 on failure
 175  */
 176 int mei_hbm_start_req(struct mei_device *dev)
 177 {
 178         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 179         struct hbm_host_version_request *start_req;
 180         const size_t len = sizeof(struct hbm_host_version_request);
 181         int ret;
 182
 183         mei_hbm_hdr(mei_hdr, len);
 184
 185         /* host start message */
 186         start_req = (struct hbm_host_version_request *)dev->wr_msg.data;
 187         memset(start_req, 0, len);
 188         start_req->hbm_cmd = HOST_START_REQ_CMD;
 189         start_req->host_version.major_version = HBM_MAJOR_VERSION;
 190         start_req->host_version.minor_version = HBM_MINOR_VERSION;
 191
 192         dev->hbm_state = MEI_HBM_IDLE;
 193         ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 194         if (ret) {
 195                 dev_err(&dev->pdev->dev, "version message write failed: ret = %d\n",
 196                         ret);
 197                 return ret;
 198         }
 199
 200         dev->hbm_state = MEI_HBM_START;
 201         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 202         return 0;
 203 }
 204
 205 /*
 206  * mei_hbm_enum_clients_req - sends enumeration client request message.
 207  *
 208  * @dev: the device structure
 209  *
 210  * returns 0 on success and < 0 on failure
 211  */
 212 static int mei_hbm_enum_clients_req(struct mei_device *dev)
 213 {
 214         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 215         struct hbm_host_enum_request *enum_req;
 216         const size_t len = sizeof(struct hbm_host_enum_request);
 217         int ret;
 218
 219         /* enumerate clients */
 220         mei_hbm_hdr(mei_hdr, len);
 221
 222         enum_req = (struct hbm_host_enum_request *)dev->wr_msg.data;
 223         memset(enum_req, 0, len);
 224         enum_req->hbm_cmd = HOST_ENUM_REQ_CMD;
 225
 226         ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 227         if (ret) {
 228                 dev_err(&dev->pdev->dev, "enumeration request write failed: ret = %d.\n",
 229                         ret);
 230                 return ret;
 231         }
 232         dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
 233         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 234         return 0;
 235 }
 236
 237 /**
 238  * mei_hbm_prop_req - request property for a single client
 239  *
 240  * @dev: the device structure
 241  *
 242  * returns 0 on success and < 0 on failure
 243  */
 244
 245 static int mei_hbm_prop_req(struct mei_device *dev)
 246 {
 247
 248         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 249         struct hbm_props_request *prop_req;
 250         const size_t len = sizeof(struct hbm_props_request);
 251         unsigned long next_client_index;
 252         unsigned long client_num;
 253         int ret;
 254
 255         client_num = dev->me_client_presentation_num;
 256
 257         next_client_index = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX,
 258                                           dev->me_client_index);
 259
 260         /* We got all client properties */
 261         if (next_client_index == MEI_CLIENTS_MAX) {
 262                 dev->hbm_state = MEI_HBM_STARTED;
 263                 schedule_work(&dev->init_work);
 264
 265                 return 0;
 266         }
 267
 268         dev->me_clients[client_num].client_id = next_client_index;
 269         dev->me_clients[client_num].mei_flow_ctrl_creds = 0;
 270
 271         mei_hbm_hdr(mei_hdr, len);
 272         prop_req = (struct hbm_props_request *)dev->wr_msg.data;
 273
 274         memset(prop_req, 0, sizeof(struct hbm_props_request));
 275
 276
 277         prop_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
 278         prop_req->address = next_client_index;
 279
 280         ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 281         if (ret) {
 282                 dev_err(&dev->pdev->dev, "properties request write failed: ret = %d\n",
 283                         ret);
 284                 return ret;
 285         }
 286
 287         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 288         dev->me_client_index = next_client_index;
 289
 290         return 0;
 291 }
 292
 293 /**
 294  * mei_hbm_stop_req - send stop request message
 295  *
 296  * @dev - mei device
 297  * @cl: client info
 298  *
 299  * This function returns -EIO on write failure
 300  */
 301 static int mei_hbm_stop_req(struct mei_device *dev)
 302 {
 303         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 304         struct hbm_host_stop_request *req =
 305                         (struct hbm_host_stop_request *)dev->wr_msg.data;
 306         const size_t len = sizeof(struct hbm_host_stop_request);
 307
 308         mei_hbm_hdr(mei_hdr, len);
 309
 310         memset(req, 0, len);
 311         req->hbm_cmd = HOST_STOP_REQ_CMD;
 312         req->reason = DRIVER_STOP_REQUEST;
 313
 314         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 315 }
 316
 317 /**
 318  * mei_hbm_cl_flow_control_req - sends flow control request.
 319  *
 320  * @dev: the device structure
 321  * @cl: client info
 322  *
 323  * This function returns -EIO on write failure
 324  */
 325 int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
 326 {
 327         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 328         const size_t len = sizeof(struct hbm_flow_control);
 329
 330         mei_hbm_hdr(mei_hdr, len);
 331         mei_hbm_cl_hdr(cl, MEI_FLOW_CONTROL_CMD, dev->wr_msg.data, len);
 332
 333         dev_dbg(&dev->pdev->dev, "sending flow control host client = %d, ME client = %d\n",
 334                 cl->host_client_id, cl->me_client_id);
 335
 336         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 337 }
 338
 339 /**
 340  * mei_hbm_add_single_flow_creds - adds single buffer credentials.
 341  *
 342  * @dev: the device structure
 343  * @flow: flow control.
 344  *
 345  * return 0 on success, < 0 otherwise
 346  */
 347 static int mei_hbm_add_single_flow_creds(struct mei_device *dev,
 348                                   struct hbm_flow_control *flow)
 349 {
 350         struct mei_me_client *me_cl;
 351         int id;
 352
 353         id = mei_me_cl_by_id(dev, flow->me_addr);
 354         if (id < 0) {
 355                 dev_err(&dev->pdev->dev, "no such me client %d\n",
 356                         flow->me_addr);
 357                 return id;
 358         }
 359
 360         me_cl = &dev->me_clients[id];
 361         if (me_cl->props.single_recv_buf) {
 362                 me_cl->mei_flow_ctrl_creds++;
 363                 dev_dbg(&dev->pdev->dev, "recv flow ctrl msg ME %d (single).\n",
 364                     flow->me_addr);
 365                 dev_dbg(&dev->pdev->dev, "flow control credentials =%d.\n",
 366                     me_cl->mei_flow_ctrl_creds);
 367         } else {
 368                 BUG();  /* error in flow control */
 369         }
 370
 371         return 0;
 372 }
 373
 374 /**
 375  * mei_hbm_cl_flow_control_res - flow control response from me
 376  *
 377  * @dev: the device structure
 378  * @flow_control: flow control response bus message
 379  */
 380 static void mei_hbm_cl_flow_control_res(struct mei_device *dev,
 381                 struct hbm_flow_control *flow_control)
 382 {
 383         struct mei_cl *cl;
 384
 385         if (!flow_control->host_addr) {
 386                 /* single receive buffer */
 387                 mei_hbm_add_single_flow_creds(dev, flow_control);
 388                 return;
 389         }
 390
 391         /* normal connection */
 392         list_for_each_entry(cl, &dev->file_list, link) {
 393                 if (mei_hbm_cl_addr_equal(cl, flow_control)) {
 394                         cl->mei_flow_ctrl_creds++;
 395                         dev_dbg(&dev->pdev->dev, "flow ctrl msg for host %d ME %d.\n",
 396                                 flow_control->host_addr, flow_control->me_addr);
 397                         dev_dbg(&dev->pdev->dev, "flow control credentials = %d.\n",
 398                                     cl->mei_flow_ctrl_creds);
 399                                 break;
 400                 }
 401         }
 402 }
 403
 404
 405 /**
 406  * mei_hbm_cl_disconnect_req - sends disconnect message to fw.
 407  *
 408  * @dev: the device structure
 409  * @cl: a client to disconnect from
 410  *
 411  * This function returns -EIO on write failure
 412  */
 413 int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
 414 {
 415         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 416         const size_t len = sizeof(struct hbm_client_connect_request);
 417
 418         mei_hbm_hdr(mei_hdr, len);
 419         mei_hbm_cl_hdr(cl, CLIENT_DISCONNECT_REQ_CMD, dev->wr_msg.data, len);
 420
 421         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 422 }
 423
 424 /**
 425  * mei_hbm_cl_disconnect_rsp - sends disconnect respose to the FW
 426  *
 427  * @dev: the device structure
 428  * @cl: a client to disconnect from
 429  *
 430  * This function returns -EIO on write failure
 431  */
 432 int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
 433 {
 434         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 435         const size_t len = sizeof(struct hbm_client_connect_response);
 436
 437         mei_hbm_hdr(mei_hdr, len);
 438         mei_hbm_cl_hdr(cl, CLIENT_DISCONNECT_RES_CMD, dev->wr_msg.data, len);
 439
 440         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 441 }
 442
 443 /**
 444  * mei_hbm_cl_disconnect_res - disconnect response from ME
 445  *
 446  * @dev: the device structure
 447  * @rs: disconnect response bus message
 448  */
 449 static void mei_hbm_cl_disconnect_res(struct mei_device *dev,
 450                 struct hbm_client_connect_response *rs)
 451 {
 452         struct mei_cl *cl;
 453         struct mei_cl_cb *cb, *next;
 454
 455         dev_dbg(&dev->pdev->dev, "hbm: disconnect response cl:host=%02d me=%02d status=%d\n",
 456                         rs->me_addr, rs->host_addr, rs->status);
 457
 458         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list.list, list) {
 459                 cl = cb->cl;
 460
 461                 /* this should not happen */
 462                 if (WARN_ON(!cl)) {
 463                         list_del(&cb->list);
 464                         return;
 465                 }
 466
 467                 if (mei_hbm_cl_addr_equal(cl, rs)) {
 468                         list_del(&cb->list);
 469                         if (rs->status == MEI_CL_DISCONN_SUCCESS)
 470                                 cl->state = MEI_FILE_DISCONNECTED;
 471
 472                         cl->status = 0;
 473                         cl->timer_count = 0;
 474                         break;
 475                 }
 476         }
 477 }
 478
 479 /**
 480  * mei_hbm_cl_connect_req - send connection request to specific me client
 481  *
 482  * @dev: the device structure
 483  * @cl: a client to connect to
 484  *
 485  * returns -EIO on write failure
 486  */
 487 int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
 488 {
 489         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 490         const size_t len = sizeof(struct hbm_client_connect_request);
 491
 492         mei_hbm_hdr(mei_hdr, len);
 493         mei_hbm_cl_hdr(cl, CLIENT_CONNECT_REQ_CMD, dev->wr_msg.data, len);
 494
 495         return mei_write_message(dev, mei_hdr,  dev->wr_msg.data);
 496 }
 497
 498 /**
 499  * mei_hbm_cl_connect_res - connect response from the ME
 500  *
 501  * @dev: the device structure
 502  * @rs: connect response bus message
 503  */
 504 static void mei_hbm_cl_connect_res(struct mei_device *dev,
 505                 struct hbm_client_connect_response *rs)
 506 {
 507
 508         struct mei_cl *cl;
 509         struct mei_cl_cb *cb, *next;
 510
 511         dev_dbg(&dev->pdev->dev, "hbm: connect response cl:host=%02d me=%02d status=%s\n",
 512                         rs->me_addr, rs->host_addr,
 513                         mei_cl_conn_status_str(rs->status));
 514
 515         cl = NULL;
 516
 517         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list.list, list) {
 518
 519                 cl = cb->cl;
 520                 /* this should not happen */
 521                 if (WARN_ON(!cl)) {
 522                         list_del_init(&cb->list);
 523                         continue;
 524                 }
 525
 526                 if (cb->fop_type !=  MEI_FOP_CONNECT)
 527                         continue;
 528
 529                 if (mei_hbm_cl_addr_equal(cl, rs)) {
 530                         list_del(&cb->list);
 531                         break;
 532                 }
 533         }
 534
 535         if (!cl)
 536                 return;
 537
 538         cl->timer_count = 0;
 539         if (rs->status == MEI_CL_CONN_SUCCESS)
 540                 cl->state = MEI_FILE_CONNECTED;
 541         else
 542                 cl->state = MEI_FILE_DISCONNECTED;
 543         cl->status = mei_cl_conn_status_to_errno(rs->status);
 544 }
 545
 546
 547 /**
 548  * mei_hbm_fw_disconnect_req - disconnect request initiated by ME firmware
 549  *  host sends disconnect response
 550  *
 551  * @dev: the device structure.
 552  * @disconnect_req: disconnect request bus message from the me
 553  *
 554  * returns -ENOMEM on allocation failure
 555  */
 556 static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
 557                 struct hbm_client_connect_request *disconnect_req)
 558 {
 559         struct mei_cl *cl;
 560         struct mei_cl_cb *cb;
 561
 562         list_for_each_entry(cl, &dev->file_list, link) {
 563                 if (mei_hbm_cl_addr_equal(cl, disconnect_req)) {
 564                         dev_dbg(&dev->pdev->dev, "disconnect request host client %d ME client %d.\n",
 565                                         disconnect_req->host_addr,
 566                                         disconnect_req->me_addr);
 567                         cl->state = MEI_FILE_DISCONNECTED;
 568                         cl->timer_count = 0;
 569
 570                         cb = mei_io_cb_init(cl, NULL);
 571                         if (!cb)
 572                                 return -ENOMEM;
 573                         cb->fop_type = MEI_FOP_DISCONNECT_RSP;
 574                         cl_dbg(dev, cl, "add disconnect response as first\n");
 575                         list_add(&cb->list, &dev->ctrl_wr_list.list);
 576
 577                         break;
 578                 }
 579         }
 580         return 0;
 581 }
 582
 583
 584 /**
 585  * mei_hbm_version_is_supported - checks whether the driver can
 586  *     support the hbm version of the device
 587  *
 588  * @dev: the device structure
 589  * returns true if driver can support hbm version of the device
 590  */
 591 bool mei_hbm_version_is_supported(struct mei_device *dev)
 592 {
 593         return  (dev->version.major_version < HBM_MAJOR_VERSION) ||
 594                 (dev->version.major_version == HBM_MAJOR_VERSION &&
 595                  dev->version.minor_version <= HBM_MINOR_VERSION);
 596 }
 597
 598 /**
 599  * mei_hbm_dispatch - bottom half read routine after ISR to
 600  * handle the read bus message cmd processing.
 601  *
 602  * @dev: the device structure
 603  * @mei_hdr: header of bus message
 604  *
 605  * returns 0 on success and < 0 on failure
 606  */
 607 int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
 608 {
 609         struct mei_bus_message *mei_msg;
 610         struct mei_me_client *me_client;
 611         struct hbm_host_version_response *version_res;
 612         struct hbm_client_connect_response *connect_res;
 613         struct hbm_client_connect_response *disconnect_res;
 614         struct hbm_client_connect_request *disconnect_req;
 615         struct hbm_flow_control *flow_control;
 616         struct hbm_props_response *props_res;
 617         struct hbm_host_enum_response *enum_res;
 618
 619         /* read the message to our buffer */
 620         BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
 621         mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
 622         mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
 623
 624         /* ignore spurious message and prevent reset nesting
 625          * hbm is put to idle during system reset
 626          */
 627         if (dev->hbm_state == MEI_HBM_IDLE) {
 628                 dev_dbg(&dev->pdev->dev, "hbm: state is idle ignore spurious messages\n");
 629                 return 0;
 630         }
 631
 632         switch (mei_msg->hbm_cmd) {
 633         case HOST_START_RES_CMD:
 634                 dev_dbg(&dev->pdev->dev, "hbm: start: response message received.\n");
 635
 636                 dev->init_clients_timer = 0;
 637
 638                 version_res = (struct hbm_host_version_response *)mei_msg;
 639
 640                 dev_dbg(&dev->pdev->dev, "HBM VERSION: DRIVER=%02d:%02d DEVICE=%02d:%02d\n",
 641                                 HBM_MAJOR_VERSION, HBM_MINOR_VERSION,
 642                                 version_res->me_max_version.major_version,
 643                                 version_res->me_max_version.minor_version);
 644
 645                 if (version_res->host_version_supported) {
 646                         dev->version.major_version = HBM_MAJOR_VERSION;
 647                         dev->version.minor_version = HBM_MINOR_VERSION;
 648                 } else {
 649                         dev->version.major_version =
 650                                 version_res->me_max_version.major_version;
 651                         dev->version.minor_version =
 652                                 version_res->me_max_version.minor_version;
 653                 }
 654
 655                 if (!mei_hbm_version_is_supported(dev)) {
 656                         dev_warn(&dev->pdev->dev, "hbm: start: version mismatch - stopping the driver.\n");
 657
 658                         dev->hbm_state = MEI_HBM_STOPPED;
 659                         if (mei_hbm_stop_req(dev)) {
 660                                 dev_err(&dev->pdev->dev, "hbm: start: failed to send stop request\n");
 661                                 return -EIO;
 662                         }
 663                         break;
 664                 }
 665
 666                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 667                     dev->hbm_state != MEI_HBM_START) {
 668                         dev_err(&dev->pdev->dev, "hbm: start: state mismatch, [%d, %d]\n",
 669                                 dev->dev_state, dev->hbm_state);
 670                         return -EPROTO;
 671                 }
 672
 673                 dev->hbm_state = MEI_HBM_STARTED;
 674
 675                 if (mei_hbm_enum_clients_req(dev)) {
 676                         dev_err(&dev->pdev->dev, "hbm: start: failed to send enumeration request\n");
 677                         return -EIO;
 678                 }
 679
 680                 wake_up_interruptible(&dev->wait_recvd_msg);
 681                 break;
 682
 683         case CLIENT_CONNECT_RES_CMD:
 684                 dev_dbg(&dev->pdev->dev, "hbm: client connect response: message received.\n");
 685
 686                 connect_res = (struct hbm_client_connect_response *) mei_msg;
 687                 mei_hbm_cl_connect_res(dev, connect_res);
 688                 wake_up(&dev->wait_recvd_msg);
 689                 break;
 690
 691         case CLIENT_DISCONNECT_RES_CMD:
 692                 dev_dbg(&dev->pdev->dev, "hbm: client disconnect response: message received.\n");
 693
 694                 disconnect_res = (struct hbm_client_connect_response *) mei_msg;
 695                 mei_hbm_cl_disconnect_res(dev, disconnect_res);
 696                 wake_up(&dev->wait_recvd_msg);
 697                 break;
 698
 699         case MEI_FLOW_CONTROL_CMD:
 700                 dev_dbg(&dev->pdev->dev, "hbm: client flow control response: message received.\n");
 701
 702                 flow_control = (struct hbm_flow_control *) mei_msg;
 703                 mei_hbm_cl_flow_control_res(dev, flow_control);
 704                 break;
 705
 706         case HOST_CLIENT_PROPERTIES_RES_CMD:
 707                 dev_dbg(&dev->pdev->dev, "hbm: properties response: message received.\n");
 708
 709                 dev->init_clients_timer = 0;
 710
 711                 if (dev->me_clients == NULL) {
 712                         dev_err(&dev->pdev->dev, "hbm: properties response: mei_clients not allocated\n");
 713                         return -EPROTO;
 714                 }
 715
 716                 props_res = (struct hbm_props_response *)mei_msg;
 717                 me_client = &dev->me_clients[dev->me_client_presentation_num];
 718
 719                 if (props_res->status) {
 720                         dev_err(&dev->pdev->dev, "hbm: properties response: wrong status = %d\n",
 721                                 props_res->status);
 722                         return -EPROTO;
 723                 }
 724
 725                 if (me_client->client_id != props_res->address) {
 726                         dev_err(&dev->pdev->dev, "hbm: properties response: address mismatch %d ?= %d\n",
 727                                 me_client->client_id, props_res->address);
 728                         return -EPROTO;
 729                 }
 730
 731                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 732                     dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
 733                         dev_err(&dev->pdev->dev, "hbm: properties response: state mismatch, [%d, %d]\n",
 734                                 dev->dev_state, dev->hbm_state);
 735                         return -EPROTO;
 736                 }
 737
 738                 me_client->props = props_res->client_properties;
 739                 dev->me_client_index++;
 740                 dev->me_client_presentation_num++;
 741
 742                 /* request property for the next client */
 743                 if (mei_hbm_prop_req(dev))
 744                         return -EIO;
 745
 746                 break;
 747
 748         case HOST_ENUM_RES_CMD:
 749                 dev_dbg(&dev->pdev->dev, "hbm: enumeration response: message received\n");
 750
 751                 dev->init_clients_timer = 0;
 752
 753                 enum_res = (struct hbm_host_enum_response *) mei_msg;
 754                 BUILD_BUG_ON(sizeof(dev->me_clients_map)
 755                                 < sizeof(enum_res->valid_addresses));
 756                 memcpy(dev->me_clients_map, enum_res->valid_addresses,
 757                         sizeof(enum_res->valid_addresses));
 758
 759                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 760                     dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
 761                         dev_err(&dev->pdev->dev, "hbm: enumeration response: state mismatch, [%d, %d]\n",
 762                                 dev->dev_state, dev->hbm_state);
 763                         return -EPROTO;
 764                 }
 765
 766                 if (mei_hbm_me_cl_allocate(dev)) {
 767                         dev_err(&dev->pdev->dev, "hbm: enumeration response: cannot allocate clients array\n");
 768                         return -ENOMEM;
 769                 }
 770
 771                 dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
 772
 773                 /* first property request */
 774                 if (mei_hbm_prop_req(dev))
 775                         return -EIO;
 776
 777                 break;
 778
 779         case HOST_STOP_RES_CMD:
 780                 dev_dbg(&dev->pdev->dev, "hbm: stop response: message received\n");
 781
 782                 dev->init_clients_timer = 0;
 783
 784                 if (dev->hbm_state != MEI_HBM_STOPPED) {
 785                         dev_err(&dev->pdev->dev, "hbm: stop response: state mismatch, [%d, %d]\n",
 786                                 dev->dev_state, dev->hbm_state);
 787                         return -EPROTO;
 788                 }
 789
 790                 dev->dev_state = MEI_DEV_POWER_DOWN;
 791                 dev_info(&dev->pdev->dev, "hbm: stop response: resetting.\n");
 792                 /* force the reset */
 793                 return -EPROTO;
 794                 break;
 795
 796         case CLIENT_DISCONNECT_REQ_CMD:
 797                 dev_dbg(&dev->pdev->dev, "hbm: disconnect request: message received\n");
 798
 799                 disconnect_req = (struct hbm_client_connect_request *)mei_msg;
 800                 mei_hbm_fw_disconnect_req(dev, disconnect_req);
 801                 break;
 802
 803         case ME_STOP_REQ_CMD:
 804                 dev_dbg(&dev->pdev->dev, "hbm: stop request: message received\n");
 805                 dev->hbm_state = MEI_HBM_STOPPED;
 806                 if (mei_hbm_stop_req(dev)) {
 807                         dev_err(&dev->pdev->dev, "hbm: start: failed to send stop request\n");
 808                         return -EIO;
 809                 }
 810                 break;
 811         default:
 812                 BUG();
 813                 break;
 814
 815         }
 816         return 0;
 817 }
 818