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/export.h>
  18 #include <linux/pci.h>
  19 #include <linux/sched.h>
  20 #include <linux/wait.h>
  21 #include <linux/mei.h>
  22 #include <linux/pm_runtime.h>
  23
  24 #include "mei_dev.h"
  25 #include "hbm.h"
  26 #include "client.h"
  27
  28 static const char *mei_cl_conn_status_str(enum mei_cl_connect_status status)
  29 {
  30 #define MEI_CL_CS(status) case MEI_CL_CONN_##status: return #status
  31         switch (status) {
  32         MEI_CL_CS(SUCCESS);
  33         MEI_CL_CS(NOT_FOUND);
  34         MEI_CL_CS(ALREADY_STARTED);
  35         MEI_CL_CS(OUT_OF_RESOURCES);
  36         MEI_CL_CS(MESSAGE_SMALL);
  37         default: return "unknown";
  38         }
  39 #undef MEI_CL_CCS
  40 }
  41
  42 /**
  43  * mei_cl_conn_status_to_errno - convert client connect response
  44  * status to error code
  45  *
  46  * @status: client connect response status
  47  *
  48  * returns corresponding error code
  49  */
  50 static int mei_cl_conn_status_to_errno(enum mei_cl_connect_status status)
  51 {
  52         switch (status) {
  53         case MEI_CL_CONN_SUCCESS:          return 0;
  54         case MEI_CL_CONN_NOT_FOUND:        return -ENOTTY;
  55         case MEI_CL_CONN_ALREADY_STARTED:  return -EBUSY;
  56         case MEI_CL_CONN_OUT_OF_RESOURCES: return -EBUSY;
  57         case MEI_CL_CONN_MESSAGE_SMALL:    return -EINVAL;
  58         default:                           return -EINVAL;
  59         }
  60 }
  61
  62 /**
  63  * mei_hbm_idle - set hbm to idle state
  64  *
  65  * @dev: the device structure
  66  */
  67 void mei_hbm_idle(struct mei_device *dev)
  68 {
  69         dev->init_clients_timer = 0;
  70         dev->hbm_state = MEI_HBM_IDLE;
  71 }
  72
  73 /**
  74  * mei_hbm_reset - reset hbm counters and book keeping data structurs
  75  *
  76  * @dev: the device structure
  77  */
  78 void mei_hbm_reset(struct mei_device *dev)
  79 {
  80         dev->me_clients_num = 0;
  81         dev->me_client_presentation_num = 0;
  82         dev->me_client_index = 0;
  83
  84         kfree(dev->me_clients);
  85         dev->me_clients = NULL;
  86
  87         mei_hbm_idle(dev);
  88 }
  89
  90 /**
  91  * mei_hbm_me_cl_allocate - allocates storage for me clients
  92  *
  93  * @dev: the device structure
  94  *
  95  * returns 0 on success -ENOMEM on allocation failure
  96  */
  97 static int mei_hbm_me_cl_allocate(struct mei_device *dev)
  98 {
  99         struct mei_me_client *clients;
 100         int b;
 101
 102         mei_hbm_reset(dev);
 103
 104         /* count how many ME clients we have */
 105         for_each_set_bit(b, dev->me_clients_map, MEI_CLIENTS_MAX)
 106                 dev->me_clients_num++;
 107
 108         if (dev->me_clients_num == 0)
 109                 return 0;
 110
 111         dev_dbg(&dev->pdev->dev, "memory allocation for ME clients size=%ld.\n",
 112                 dev->me_clients_num * sizeof(struct mei_me_client));
 113         /* allocate storage for ME clients representation */
 114         clients = kcalloc(dev->me_clients_num,
 115                         sizeof(struct mei_me_client), GFP_KERNEL);
 116         if (!clients) {
 117                 dev_err(&dev->pdev->dev, "memory allocation for ME clients failed.\n");
 118                 return -ENOMEM;
 119         }
 120         dev->me_clients = clients;
 121         return 0;
 122 }
 123
 124 /**
 125  * mei_hbm_cl_hdr - construct client hbm header
 126  *
 127  * @cl: - client
 128  * @hbm_cmd: host bus message command
 129  * @buf: buffer for cl header
 130  * @len: buffer length
 131  */
 132 static inline
 133 void mei_hbm_cl_hdr(struct mei_cl *cl, u8 hbm_cmd, void *buf, size_t len)
 134 {
 135         struct mei_hbm_cl_cmd *cmd = buf;
 136
 137         memset(cmd, 0, len);
 138
 139         cmd->hbm_cmd = hbm_cmd;
 140         cmd->host_addr = cl->host_client_id;
 141         cmd->me_addr = cl->me_client_id;
 142 }
 143
 144 /**
 145  * mei_hbm_cl_addr_equal - tells if they have the same address
 146  *
 147  * @cl: - client
 148  * @buf: buffer with cl header
 149  *
 150  * returns true if addresses are the same
 151  */
 152 static inline
 153 bool mei_hbm_cl_addr_equal(struct mei_cl *cl, void *buf)
 154 {
 155         struct mei_hbm_cl_cmd *cmd = buf;
 156         return cl->host_client_id == cmd->host_addr &&
 157                 cl->me_client_id == cmd->me_addr;
 158 }
 159
 160
 161 int mei_hbm_start_wait(struct mei_device *dev)
 162 {
 163         int ret;
 164         if (dev->hbm_state > MEI_HBM_START)
 165                 return 0;
 166
 167         mutex_unlock(&dev->device_lock);
 168         ret = wait_event_interruptible_timeout(dev->wait_recvd_msg,
 169                         dev->hbm_state == MEI_HBM_IDLE ||
 170                         dev->hbm_state >= MEI_HBM_STARTED,
 171                         mei_secs_to_jiffies(MEI_HBM_TIMEOUT));
 172         mutex_lock(&dev->device_lock);
 173
 174         if (ret <= 0 && (dev->hbm_state <= MEI_HBM_START)) {
 175                 dev->hbm_state = MEI_HBM_IDLE;
 176                 dev_err(&dev->pdev->dev, "waiting for mei start failed\n");
 177                 return -ETIME;
 178         }
 179         return 0;
 180 }
 181
 182 /**
 183  * mei_hbm_start_req - sends start request message.
 184  *
 185  * @dev: the device structure
 186  *
 187  * returns 0 on success and < 0 on failure
 188  */
 189 int mei_hbm_start_req(struct mei_device *dev)
 190 {
 191         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 192         struct hbm_host_version_request *start_req;
 193         const size_t len = sizeof(struct hbm_host_version_request);
 194         int ret;
 195
 196         mei_hbm_hdr(mei_hdr, len);
 197
 198         /* host start message */
 199         start_req = (struct hbm_host_version_request *)dev->wr_msg.data;
 200         memset(start_req, 0, len);
 201         start_req->hbm_cmd = HOST_START_REQ_CMD;
 202         start_req->host_version.major_version = HBM_MAJOR_VERSION;
 203         start_req->host_version.minor_version = HBM_MINOR_VERSION;
 204
 205         dev->hbm_state = MEI_HBM_IDLE;
 206         ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 207         if (ret) {
 208                 dev_err(&dev->pdev->dev, "version message write failed: ret = %d\n",
 209                         ret);
 210                 return ret;
 211         }
 212
 213         dev->hbm_state = MEI_HBM_START;
 214         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 215         return 0;
 216 }
 217
 218 /*
 219  * mei_hbm_enum_clients_req - sends enumeration client request message.
 220  *
 221  * @dev: the device structure
 222  *
 223  * returns 0 on success and < 0 on failure
 224  */
 225 static int mei_hbm_enum_clients_req(struct mei_device *dev)
 226 {
 227         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 228         struct hbm_host_enum_request *enum_req;
 229         const size_t len = sizeof(struct hbm_host_enum_request);
 230         int ret;
 231
 232         /* enumerate clients */
 233         mei_hbm_hdr(mei_hdr, len);
 234
 235         enum_req = (struct hbm_host_enum_request *)dev->wr_msg.data;
 236         memset(enum_req, 0, len);
 237         enum_req->hbm_cmd = HOST_ENUM_REQ_CMD;
 238
 239         ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 240         if (ret) {
 241                 dev_err(&dev->pdev->dev, "enumeration request write failed: ret = %d.\n",
 242                         ret);
 243                 return ret;
 244         }
 245         dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
 246         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 247         return 0;
 248 }
 249
 250 /**
 251  * mei_hbm_prop_req - request property for a single client
 252  *
 253  * @dev: the device structure
 254  *
 255  * returns 0 on success and < 0 on failure
 256  */
 257
 258 static int mei_hbm_prop_req(struct mei_device *dev)
 259 {
 260
 261         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 262         struct hbm_props_request *prop_req;
 263         const size_t len = sizeof(struct hbm_props_request);
 264         unsigned long next_client_index;
 265         unsigned long client_num;
 266         int ret;
 267
 268         client_num = dev->me_client_presentation_num;
 269
 270         next_client_index = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX,
 271                                           dev->me_client_index);
 272
 273         /* We got all client properties */
 274         if (next_client_index == MEI_CLIENTS_MAX) {
 275                 dev->hbm_state = MEI_HBM_STARTED;
 276                 schedule_work(&dev->init_work);
 277
 278                 return 0;
 279         }
 280
 281         dev->me_clients[client_num].client_id = next_client_index;
 282         dev->me_clients[client_num].mei_flow_ctrl_creds = 0;
 283
 284         mei_hbm_hdr(mei_hdr, len);
 285         prop_req = (struct hbm_props_request *)dev->wr_msg.data;
 286
 287         memset(prop_req, 0, sizeof(struct hbm_props_request));
 288
 289
 290         prop_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
 291         prop_req->address = next_client_index;
 292
 293         ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 294         if (ret) {
 295                 dev_err(&dev->pdev->dev, "properties request write failed: ret = %d\n",
 296                         ret);
 297                 return ret;
 298         }
 299
 300         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 301         dev->me_client_index = next_client_index;
 302
 303         return 0;
 304 }
 305
 306 /*
 307  * mei_hbm_pg - sends pg command
 308  *
 309  * @dev: the device structure
 310  * @pg_cmd: the pg command code
 311  *
 312  * This function returns -EIO on write failure
 313  */
 314 int mei_hbm_pg(struct mei_device *dev, u8 pg_cmd)
 315 {
 316         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 317         struct hbm_power_gate *req;
 318         const size_t len = sizeof(struct hbm_power_gate);
 319         int ret;
 320
 321         mei_hbm_hdr(mei_hdr, len);
 322
 323         req = (struct hbm_power_gate *)dev->wr_msg.data;
 324         memset(req, 0, len);
 325         req->hbm_cmd = pg_cmd;
 326
 327         ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 328         if (ret)
 329                 dev_err(&dev->pdev->dev, "power gate command write failed.\n");
 330         return ret;
 331 }
 332 EXPORT_SYMBOL_GPL(mei_hbm_pg);
 333
 334 /**
 335  * mei_hbm_stop_req - send stop request message
 336  *
 337  * @dev - mei device
 338  * @cl: client info
 339  *
 340  * This function returns -EIO on write failure
 341  */
 342 static int mei_hbm_stop_req(struct mei_device *dev)
 343 {
 344         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 345         struct hbm_host_stop_request *req =
 346                         (struct hbm_host_stop_request *)dev->wr_msg.data;
 347         const size_t len = sizeof(struct hbm_host_stop_request);
 348
 349         mei_hbm_hdr(mei_hdr, len);
 350
 351         memset(req, 0, len);
 352         req->hbm_cmd = HOST_STOP_REQ_CMD;
 353         req->reason = DRIVER_STOP_REQUEST;
 354
 355         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 356 }
 357
 358 /**
 359  * mei_hbm_cl_flow_control_req - sends flow control request.
 360  *
 361  * @dev: the device structure
 362  * @cl: client info
 363  *
 364  * This function returns -EIO on write failure
 365  */
 366 int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
 367 {
 368         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 369         const size_t len = sizeof(struct hbm_flow_control);
 370
 371         mei_hbm_hdr(mei_hdr, len);
 372         mei_hbm_cl_hdr(cl, MEI_FLOW_CONTROL_CMD, dev->wr_msg.data, len);
 373
 374         cl_dbg(dev, cl, "sending flow control\n");
 375
 376         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 377 }
 378
 379 /**
 380  * mei_hbm_add_single_flow_creds - adds single buffer credentials.
 381  *
 382  * @dev: the device structure
 383  * @flow: flow control.
 384  *
 385  * return 0 on success, < 0 otherwise
 386  */
 387 static int mei_hbm_add_single_flow_creds(struct mei_device *dev,
 388                                   struct hbm_flow_control *flow)
 389 {
 390         struct mei_me_client *me_cl;
 391         int id;
 392
 393         id = mei_me_cl_by_id(dev, flow->me_addr);
 394         if (id < 0) {
 395                 dev_err(&dev->pdev->dev, "no such me client %d\n",
 396                         flow->me_addr);
 397                 return id;
 398         }
 399
 400         me_cl = &dev->me_clients[id];
 401         if (me_cl->props.single_recv_buf) {
 402                 me_cl->mei_flow_ctrl_creds++;
 403                 dev_dbg(&dev->pdev->dev, "recv flow ctrl msg ME %d (single).\n",
 404                     flow->me_addr);
 405                 dev_dbg(&dev->pdev->dev, "flow control credentials =%d.\n",
 406                     me_cl->mei_flow_ctrl_creds);
 407         } else {
 408                 BUG();  /* error in flow control */
 409         }
 410
 411         return 0;
 412 }
 413
 414 /**
 415  * mei_hbm_cl_flow_control_res - flow control response from me
 416  *
 417  * @dev: the device structure
 418  * @flow_control: flow control response bus message
 419  */
 420 static void mei_hbm_cl_flow_control_res(struct mei_device *dev,
 421                 struct hbm_flow_control *flow_control)
 422 {
 423         struct mei_cl *cl;
 424
 425         if (!flow_control->host_addr) {
 426                 /* single receive buffer */
 427                 mei_hbm_add_single_flow_creds(dev, flow_control);
 428                 return;
 429         }
 430
 431         /* normal connection */
 432         list_for_each_entry(cl, &dev->file_list, link) {
 433                 if (mei_hbm_cl_addr_equal(cl, flow_control)) {
 434                         cl->mei_flow_ctrl_creds++;
 435                         dev_dbg(&dev->pdev->dev, "flow ctrl msg for host %d ME %d.\n",
 436                                 flow_control->host_addr, flow_control->me_addr);
 437                         dev_dbg(&dev->pdev->dev, "flow control credentials = %d.\n",
 438                                     cl->mei_flow_ctrl_creds);
 439                                 break;
 440                 }
 441         }
 442 }
 443
 444
 445 /**
 446  * mei_hbm_cl_disconnect_req - sends disconnect message to fw.
 447  *
 448  * @dev: the device structure
 449  * @cl: a client to disconnect from
 450  *
 451  * This function returns -EIO on write failure
 452  */
 453 int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
 454 {
 455         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 456         const size_t len = sizeof(struct hbm_client_connect_request);
 457
 458         mei_hbm_hdr(mei_hdr, len);
 459         mei_hbm_cl_hdr(cl, CLIENT_DISCONNECT_REQ_CMD, dev->wr_msg.data, len);
 460
 461         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 462 }
 463
 464 /**
 465  * mei_hbm_cl_disconnect_rsp - sends disconnect respose to the FW
 466  *
 467  * @dev: the device structure
 468  * @cl: a client to disconnect from
 469  *
 470  * This function returns -EIO on write failure
 471  */
 472 int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
 473 {
 474         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 475         const size_t len = sizeof(struct hbm_client_connect_response);
 476
 477         mei_hbm_hdr(mei_hdr, len);
 478         mei_hbm_cl_hdr(cl, CLIENT_DISCONNECT_RES_CMD, dev->wr_msg.data, len);
 479
 480         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 481 }
 482
 483 /**
 484  * mei_hbm_cl_disconnect_res - disconnect response from ME
 485  *
 486  * @dev: the device structure
 487  * @rs: disconnect response bus message
 488  */
 489 static void mei_hbm_cl_disconnect_res(struct mei_device *dev,
 490                 struct hbm_client_connect_response *rs)
 491 {
 492         struct mei_cl *cl;
 493         struct mei_cl_cb *cb, *next;
 494
 495         dev_dbg(&dev->pdev->dev, "hbm: disconnect response cl:host=%02d me=%02d status=%d\n",
 496                         rs->me_addr, rs->host_addr, rs->status);
 497
 498         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list.list, list) {
 499                 cl = cb->cl;
 500
 501                 /* this should not happen */
 502                 if (WARN_ON(!cl)) {
 503                         list_del(&cb->list);
 504                         return;
 505                 }
 506
 507                 if (mei_hbm_cl_addr_equal(cl, rs)) {
 508                         list_del(&cb->list);
 509                         if (rs->status == MEI_CL_DISCONN_SUCCESS)
 510                                 cl->state = MEI_FILE_DISCONNECTED;
 511
 512                         cl->status = 0;
 513                         cl->timer_count = 0;
 514                         break;
 515                 }
 516         }
 517 }
 518
 519 /**
 520  * mei_hbm_cl_connect_req - send connection request to specific me client
 521  *
 522  * @dev: the device structure
 523  * @cl: a client to connect to
 524  *
 525  * returns -EIO on write failure
 526  */
 527 int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
 528 {
 529         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 530         const size_t len = sizeof(struct hbm_client_connect_request);
 531
 532         mei_hbm_hdr(mei_hdr, len);
 533         mei_hbm_cl_hdr(cl, CLIENT_CONNECT_REQ_CMD, dev->wr_msg.data, len);
 534
 535         return mei_write_message(dev, mei_hdr,  dev->wr_msg.data);
 536 }
 537
 538 /**
 539  * mei_hbm_cl_connect_res - connect response from the ME
 540  *
 541  * @dev: the device structure
 542  * @rs: connect response bus message
 543  */
 544 static void mei_hbm_cl_connect_res(struct mei_device *dev,
 545                 struct hbm_client_connect_response *rs)
 546 {
 547
 548         struct mei_cl *cl;
 549         struct mei_cl_cb *cb, *next;
 550
 551         dev_dbg(&dev->pdev->dev, "hbm: connect response cl:host=%02d me=%02d status=%s\n",
 552                         rs->me_addr, rs->host_addr,
 553                         mei_cl_conn_status_str(rs->status));
 554
 555         cl = NULL;
 556
 557         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list.list, list) {
 558
 559                 cl = cb->cl;
 560                 /* this should not happen */
 561                 if (WARN_ON(!cl)) {
 562                         list_del_init(&cb->list);
 563                         continue;
 564                 }
 565
 566                 if (cb->fop_type !=  MEI_FOP_CONNECT)
 567                         continue;
 568
 569                 if (mei_hbm_cl_addr_equal(cl, rs)) {
 570                         list_del(&cb->list);
 571                         break;
 572                 }
 573         }
 574
 575         if (!cl)
 576                 return;
 577
 578         cl->timer_count = 0;
 579         if (rs->status == MEI_CL_CONN_SUCCESS)
 580                 cl->state = MEI_FILE_CONNECTED;
 581         else
 582                 cl->state = MEI_FILE_DISCONNECTED;
 583         cl->status = mei_cl_conn_status_to_errno(rs->status);
 584 }
 585
 586
 587 /**
 588  * mei_hbm_fw_disconnect_req - disconnect request initiated by ME firmware
 589  *  host sends disconnect response
 590  *
 591  * @dev: the device structure.
 592  * @disconnect_req: disconnect request bus message from the me
 593  *
 594  * returns -ENOMEM on allocation failure
 595  */
 596 static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
 597                 struct hbm_client_connect_request *disconnect_req)
 598 {
 599         struct mei_cl *cl;
 600         struct mei_cl_cb *cb;
 601
 602         list_for_each_entry(cl, &dev->file_list, link) {
 603                 if (mei_hbm_cl_addr_equal(cl, disconnect_req)) {
 604                         dev_dbg(&dev->pdev->dev, "disconnect request host client %d ME client %d.\n",
 605                                         disconnect_req->host_addr,
 606                                         disconnect_req->me_addr);
 607                         cl->state = MEI_FILE_DISCONNECTED;
 608                         cl->timer_count = 0;
 609
 610                         cb = mei_io_cb_init(cl, NULL);
 611                         if (!cb)
 612                                 return -ENOMEM;
 613                         cb->fop_type = MEI_FOP_DISCONNECT_RSP;
 614                         cl_dbg(dev, cl, "add disconnect response as first\n");
 615                         list_add(&cb->list, &dev->ctrl_wr_list.list);
 616
 617                         break;
 618                 }
 619         }
 620         return 0;
 621 }
 622
 623
 624 /**
 625  * mei_hbm_version_is_supported - checks whether the driver can
 626  *     support the hbm version of the device
 627  *
 628  * @dev: the device structure
 629  * returns true if driver can support hbm version of the device
 630  */
 631 bool mei_hbm_version_is_supported(struct mei_device *dev)
 632 {
 633         return  (dev->version.major_version < HBM_MAJOR_VERSION) ||
 634                 (dev->version.major_version == HBM_MAJOR_VERSION &&
 635                  dev->version.minor_version <= HBM_MINOR_VERSION);
 636 }
 637
 638 /**
 639  * mei_hbm_dispatch - bottom half read routine after ISR to
 640  * handle the read bus message cmd processing.
 641  *
 642  * @dev: the device structure
 643  * @mei_hdr: header of bus message
 644  *
 645  * returns 0 on success and < 0 on failure
 646  */
 647 int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
 648 {
 649         struct mei_bus_message *mei_msg;
 650         struct mei_me_client *me_client;
 651         struct hbm_host_version_response *version_res;
 652         struct hbm_client_connect_response *connect_res;
 653         struct hbm_client_connect_response *disconnect_res;
 654         struct hbm_client_connect_request *disconnect_req;
 655         struct hbm_flow_control *flow_control;
 656         struct hbm_props_response *props_res;
 657         struct hbm_host_enum_response *enum_res;
 658
 659         /* read the message to our buffer */
 660         BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
 661         mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
 662         mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
 663
 664         /* ignore spurious message and prevent reset nesting
 665          * hbm is put to idle during system reset
 666          */
 667         if (dev->hbm_state == MEI_HBM_IDLE) {
 668                 dev_dbg(&dev->pdev->dev, "hbm: state is idle ignore spurious messages\n");
 669                 return 0;
 670         }
 671
 672         switch (mei_msg->hbm_cmd) {
 673         case HOST_START_RES_CMD:
 674                 dev_dbg(&dev->pdev->dev, "hbm: start: response message received.\n");
 675
 676                 dev->init_clients_timer = 0;
 677
 678                 version_res = (struct hbm_host_version_response *)mei_msg;
 679
 680                 dev_dbg(&dev->pdev->dev, "HBM VERSION: DRIVER=%02d:%02d DEVICE=%02d:%02d\n",
 681                                 HBM_MAJOR_VERSION, HBM_MINOR_VERSION,
 682                                 version_res->me_max_version.major_version,
 683                                 version_res->me_max_version.minor_version);
 684
 685                 if (version_res->host_version_supported) {
 686                         dev->version.major_version = HBM_MAJOR_VERSION;
 687                         dev->version.minor_version = HBM_MINOR_VERSION;
 688                 } else {
 689                         dev->version.major_version =
 690                                 version_res->me_max_version.major_version;
 691                         dev->version.minor_version =
 692                                 version_res->me_max_version.minor_version;
 693                 }
 694
 695                 if (!mei_hbm_version_is_supported(dev)) {
 696                         dev_warn(&dev->pdev->dev, "hbm: start: version mismatch - stopping the driver.\n");
 697
 698                         dev->hbm_state = MEI_HBM_STOPPED;
 699                         if (mei_hbm_stop_req(dev)) {
 700                                 dev_err(&dev->pdev->dev, "hbm: start: failed to send stop request\n");
 701                                 return -EIO;
 702                         }
 703                         break;
 704                 }
 705
 706                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 707                     dev->hbm_state != MEI_HBM_START) {
 708                         dev_err(&dev->pdev->dev, "hbm: start: state mismatch, [%d, %d]\n",
 709                                 dev->dev_state, dev->hbm_state);
 710                         return -EPROTO;
 711                 }
 712
 713                 dev->hbm_state = MEI_HBM_STARTED;
 714
 715                 if (mei_hbm_enum_clients_req(dev)) {
 716                         dev_err(&dev->pdev->dev, "hbm: start: failed to send enumeration request\n");
 717                         return -EIO;
 718                 }
 719
 720                 wake_up_interruptible(&dev->wait_recvd_msg);
 721                 break;
 722
 723         case CLIENT_CONNECT_RES_CMD:
 724                 dev_dbg(&dev->pdev->dev, "hbm: client connect response: message received.\n");
 725
 726                 connect_res = (struct hbm_client_connect_response *) mei_msg;
 727                 mei_hbm_cl_connect_res(dev, connect_res);
 728                 wake_up(&dev->wait_recvd_msg);
 729                 break;
 730
 731         case CLIENT_DISCONNECT_RES_CMD:
 732                 dev_dbg(&dev->pdev->dev, "hbm: client disconnect response: message received.\n");
 733
 734                 disconnect_res = (struct hbm_client_connect_response *) mei_msg;
 735                 mei_hbm_cl_disconnect_res(dev, disconnect_res);
 736                 wake_up(&dev->wait_recvd_msg);
 737                 break;
 738
 739         case MEI_FLOW_CONTROL_CMD:
 740                 dev_dbg(&dev->pdev->dev, "hbm: client flow control response: message received.\n");
 741
 742                 flow_control = (struct hbm_flow_control *) mei_msg;
 743                 mei_hbm_cl_flow_control_res(dev, flow_control);
 744                 break;
 745
 746         case MEI_PG_ISOLATION_ENTRY_RES_CMD:
 747                 dev_dbg(&dev->pdev->dev, "power gate isolation entry response received\n");
 748                 dev->pg_event = MEI_PG_EVENT_RECEIVED;
 749                 if (waitqueue_active(&dev->wait_pg))
 750                         wake_up(&dev->wait_pg);
 751                 break;
 752
 753         case MEI_PG_ISOLATION_EXIT_REQ_CMD:
 754                 dev_dbg(&dev->pdev->dev, "power gate isolation exit request received\n");
 755                 dev->pg_event = MEI_PG_EVENT_RECEIVED;
 756                 if (waitqueue_active(&dev->wait_pg))
 757                         wake_up(&dev->wait_pg);
 758                 else
 759                         /*
 760                         * If the driver is not waiting on this then
 761                         * this is HW initiated exit from PG.
 762                         * Start runtime pm resume sequence to exit from PG.
 763                         */
 764                         pm_request_resume(&dev->pdev->dev);
 765                 break;
 766
 767         case HOST_CLIENT_PROPERTIES_RES_CMD:
 768                 dev_dbg(&dev->pdev->dev, "hbm: properties response: message received.\n");
 769
 770                 dev->init_clients_timer = 0;
 771
 772                 if (dev->me_clients == NULL) {
 773                         dev_err(&dev->pdev->dev, "hbm: properties response: mei_clients not allocated\n");
 774                         return -EPROTO;
 775                 }
 776
 777                 props_res = (struct hbm_props_response *)mei_msg;
 778                 me_client = &dev->me_clients[dev->me_client_presentation_num];
 779
 780                 if (props_res->status) {
 781                         dev_err(&dev->pdev->dev, "hbm: properties response: wrong status = %d\n",
 782                                 props_res->status);
 783                         return -EPROTO;
 784                 }
 785
 786                 if (me_client->client_id != props_res->address) {
 787                         dev_err(&dev->pdev->dev, "hbm: properties response: address mismatch %d ?= %d\n",
 788                                 me_client->client_id, props_res->address);
 789                         return -EPROTO;
 790                 }
 791
 792                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 793                     dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
 794                         dev_err(&dev->pdev->dev, "hbm: properties response: state mismatch, [%d, %d]\n",
 795                                 dev->dev_state, dev->hbm_state);
 796                         return -EPROTO;
 797                 }
 798
 799                 me_client->props = props_res->client_properties;
 800                 dev->me_client_index++;
 801                 dev->me_client_presentation_num++;
 802
 803                 /* request property for the next client */
 804                 if (mei_hbm_prop_req(dev))
 805                         return -EIO;
 806
 807                 break;
 808
 809         case HOST_ENUM_RES_CMD:
 810                 dev_dbg(&dev->pdev->dev, "hbm: enumeration response: message received\n");
 811
 812                 dev->init_clients_timer = 0;
 813
 814                 enum_res = (struct hbm_host_enum_response *) mei_msg;
 815                 BUILD_BUG_ON(sizeof(dev->me_clients_map)
 816                                 < sizeof(enum_res->valid_addresses));
 817                 memcpy(dev->me_clients_map, enum_res->valid_addresses,
 818                         sizeof(enum_res->valid_addresses));
 819
 820                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 821                     dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
 822                         dev_err(&dev->pdev->dev, "hbm: enumeration response: state mismatch, [%d, %d]\n",
 823                                 dev->dev_state, dev->hbm_state);
 824                         return -EPROTO;
 825                 }
 826
 827                 if (mei_hbm_me_cl_allocate(dev)) {
 828                         dev_err(&dev->pdev->dev, "hbm: enumeration response: cannot allocate clients array\n");
 829                         return -ENOMEM;
 830                 }
 831
 832                 dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
 833
 834                 /* first property request */
 835                 if (mei_hbm_prop_req(dev))
 836                         return -EIO;
 837
 838                 break;
 839
 840         case HOST_STOP_RES_CMD:
 841                 dev_dbg(&dev->pdev->dev, "hbm: stop response: message received\n");
 842
 843                 dev->init_clients_timer = 0;
 844
 845                 if (dev->hbm_state != MEI_HBM_STOPPED) {
 846                         dev_err(&dev->pdev->dev, "hbm: stop response: state mismatch, [%d, %d]\n",
 847                                 dev->dev_state, dev->hbm_state);
 848                         return -EPROTO;
 849                 }
 850
 851                 dev->dev_state = MEI_DEV_POWER_DOWN;
 852                 dev_info(&dev->pdev->dev, "hbm: stop response: resetting.\n");
 853                 /* force the reset */
 854                 return -EPROTO;
 855                 break;
 856
 857         case CLIENT_DISCONNECT_REQ_CMD:
 858                 dev_dbg(&dev->pdev->dev, "hbm: disconnect request: message received\n");
 859
 860                 disconnect_req = (struct hbm_client_connect_request *)mei_msg;
 861                 mei_hbm_fw_disconnect_req(dev, disconnect_req);
 862                 break;
 863
 864         case ME_STOP_REQ_CMD:
 865                 dev_dbg(&dev->pdev->dev, "hbm: stop request: message received\n");
 866                 dev->hbm_state = MEI_HBM_STOPPED;
 867                 if (mei_hbm_stop_req(dev)) {
 868                         dev_err(&dev->pdev->dev, "hbm: start: failed to send stop request\n");
 869                         return -EIO;
 870                 }
 871                 break;
 872         default:
 873                 BUG();
 874                 break;
 875
 876         }
 877         return 0;
 878 }
 879