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/sched.h>
  19 #include <linux/wait.h>
  20 #include <linux/pm_runtime.h>
  21 #include <linux/slab.h>
  22
  23 #include <linux/mei.h>
  24
  25 #include "mei_dev.h"
  26 #include "hbm.h"
  27 #include "client.h"
  28
  29 static const char *mei_hbm_status_str(enum mei_hbm_status status)
  30 {
  31 #define MEI_HBM_STATUS(status) case MEI_HBMS_##status: return #status
  32         switch (status) {
  33         MEI_HBM_STATUS(SUCCESS);
  34         MEI_HBM_STATUS(CLIENT_NOT_FOUND);
  35         MEI_HBM_STATUS(ALREADY_EXISTS);
  36         MEI_HBM_STATUS(REJECTED);
  37         MEI_HBM_STATUS(INVALID_PARAMETER);
  38         MEI_HBM_STATUS(NOT_ALLOWED);
  39         MEI_HBM_STATUS(ALREADY_STARTED);
  40         MEI_HBM_STATUS(NOT_STARTED);
  41         default: return "unknown";
  42         }
  43 #undef MEI_HBM_STATUS
  44 };
  45
  46 static const char *mei_cl_conn_status_str(enum mei_cl_connect_status status)
  47 {
  48 #define MEI_CL_CS(status) case MEI_CL_CONN_##status: return #status
  49         switch (status) {
  50         MEI_CL_CS(SUCCESS);
  51         MEI_CL_CS(NOT_FOUND);
  52         MEI_CL_CS(ALREADY_STARTED);
  53         MEI_CL_CS(OUT_OF_RESOURCES);
  54         MEI_CL_CS(MESSAGE_SMALL);
  55         MEI_CL_CS(NOT_ALLOWED);
  56         default: return "unknown";
  57         }
  58 #undef MEI_CL_CCS
  59 }
  60
  61 const char *mei_hbm_state_str(enum mei_hbm_state state)
  62 {
  63 #define MEI_HBM_STATE(state) case MEI_HBM_##state: return #state
  64         switch (state) {
  65         MEI_HBM_STATE(IDLE);
  66         MEI_HBM_STATE(STARTING);
  67         MEI_HBM_STATE(STARTED);
  68         MEI_HBM_STATE(DR_SETUP);
  69         MEI_HBM_STATE(ENUM_CLIENTS);
  70         MEI_HBM_STATE(CLIENT_PROPERTIES);
  71         MEI_HBM_STATE(STOPPED);
  72         default:
  73                 return "unknown";
  74         }
  75 #undef MEI_HBM_STATE
  76 }
  77
  78 /**
  79  * mei_cl_conn_status_to_errno - convert client connect response
  80  * status to error code
  81  *
  82  * @status: client connect response status
  83  *
  84  * Return: corresponding error code
  85  */
  86 static int mei_cl_conn_status_to_errno(enum mei_cl_connect_status status)
  87 {
  88         switch (status) {
  89         case MEI_CL_CONN_SUCCESS:          return 0;
  90         case MEI_CL_CONN_NOT_FOUND:        return -ENOTTY;
  91         case MEI_CL_CONN_ALREADY_STARTED:  return -EBUSY;
  92         case MEI_CL_CONN_OUT_OF_RESOURCES: return -EBUSY;
  93         case MEI_CL_CONN_MESSAGE_SMALL:    return -EINVAL;
  94         case MEI_CL_CONN_NOT_ALLOWED:      return -EBUSY;
  95         default:                           return -EINVAL;
  96         }
  97 }
  98
  99 /**
 100  * mei_hbm_write_message - wrapper for sending hbm messages.
 101  *
 102  * @dev: mei device
 103  * @hdr: mei header
 104  * @data: payload
 105  */
 106 static inline int mei_hbm_write_message(struct mei_device *dev,
 107                                         struct mei_msg_hdr *hdr,
 108                                         const void *data)
 109 {
 110         return mei_write_message(dev, hdr, sizeof(*hdr), data, hdr->length);
 111 }
 112
 113 /**
 114  * mei_hbm_idle - set hbm to idle state
 115  *
 116  * @dev: the device structure
 117  */
 118 void mei_hbm_idle(struct mei_device *dev)
 119 {
 120         dev->init_clients_timer = 0;
 121         dev->hbm_state = MEI_HBM_IDLE;
 122 }
 123
 124 /**
 125  * mei_hbm_reset - reset hbm counters and book keeping data structurs
 126  *
 127  * @dev: the device structure
 128  */
 129 void mei_hbm_reset(struct mei_device *dev)
 130 {
 131         mei_me_cl_rm_all(dev);
 132
 133         mei_hbm_idle(dev);
 134 }
 135
 136 /**
 137  * mei_hbm_hdr - construct hbm header
 138  *
 139  * @hdr: hbm header
 140  * @length: payload length
 141  */
 142
 143 static inline void mei_hbm_hdr(struct mei_msg_hdr *hdr, size_t length)
 144 {
 145         hdr->host_addr = 0;
 146         hdr->me_addr = 0;
 147         hdr->length = length;
 148         hdr->msg_complete = 1;
 149         hdr->dma_ring = 0;
 150         hdr->reserved = 0;
 151         hdr->internal = 0;
 152 }
 153
 154 /**
 155  * mei_hbm_cl_hdr - construct client hbm header
 156  *
 157  * @cl: client
 158  * @hbm_cmd: host bus message command
 159  * @buf: buffer for cl header
 160  * @len: buffer length
 161  */
 162 static inline
 163 void mei_hbm_cl_hdr(struct mei_cl *cl, u8 hbm_cmd, void *buf, size_t len)
 164 {
 165         struct mei_hbm_cl_cmd *cmd = buf;
 166
 167         memset(cmd, 0, len);
 168
 169         cmd->hbm_cmd = hbm_cmd;
 170         cmd->host_addr = mei_cl_host_addr(cl);
 171         cmd->me_addr = mei_cl_me_id(cl);
 172 }
 173
 174 /**
 175  * mei_hbm_cl_write - write simple hbm client message
 176  *
 177  * @dev: the device structure
 178  * @cl: client
 179  * @hbm_cmd: host bus message command
 180  * @buf: message buffer
 181  * @len: buffer length
 182  *
 183  * Return: 0 on success, <0 on failure.
 184  */
 185 static inline int mei_hbm_cl_write(struct mei_device *dev, struct mei_cl *cl,
 186                                    u8 hbm_cmd, void *buf, size_t len)
 187 {
 188         struct mei_msg_hdr mei_hdr;
 189
 190         mei_hbm_hdr(&mei_hdr, len);
 191         mei_hbm_cl_hdr(cl, hbm_cmd, buf, len);
 192
 193         return mei_hbm_write_message(dev, &mei_hdr, buf);
 194 }
 195
 196 /**
 197  * mei_hbm_cl_addr_equal - check if the client's and
 198  *      the message address match
 199  *
 200  * @cl: client
 201  * @cmd: hbm client message
 202  *
 203  * Return: true if addresses are the same
 204  */
 205 static inline
 206 bool mei_hbm_cl_addr_equal(struct mei_cl *cl, struct mei_hbm_cl_cmd *cmd)
 207 {
 208         return  mei_cl_host_addr(cl) == cmd->host_addr &&
 209                 mei_cl_me_id(cl) == cmd->me_addr;
 210 }
 211
 212 /**
 213  * mei_hbm_cl_find_by_cmd - find recipient client
 214  *
 215  * @dev: the device structure
 216  * @buf: a buffer with hbm cl command
 217  *
 218  * Return: the recipient client or NULL if not found
 219  */
 220 static inline
 221 struct mei_cl *mei_hbm_cl_find_by_cmd(struct mei_device *dev, void *buf)
 222 {
 223         struct mei_hbm_cl_cmd *cmd = (struct mei_hbm_cl_cmd *)buf;
 224         struct mei_cl *cl;
 225
 226         list_for_each_entry(cl, &dev->file_list, link)
 227                 if (mei_hbm_cl_addr_equal(cl, cmd))
 228                         return cl;
 229         return NULL;
 230 }
 231
 232
 233 /**
 234  * mei_hbm_start_wait - wait for start response message.
 235  *
 236  * @dev: the device structure
 237  *
 238  * Return: 0 on success and < 0 on failure
 239  */
 240 int mei_hbm_start_wait(struct mei_device *dev)
 241 {
 242         int ret;
 243
 244         if (dev->hbm_state > MEI_HBM_STARTING)
 245                 return 0;
 246
 247         mutex_unlock(&dev->device_lock);
 248         ret = wait_event_timeout(dev->wait_hbm_start,
 249                         dev->hbm_state != MEI_HBM_STARTING,
 250                         mei_secs_to_jiffies(MEI_HBM_TIMEOUT));
 251         mutex_lock(&dev->device_lock);
 252
 253         if (ret == 0 && (dev->hbm_state <= MEI_HBM_STARTING)) {
 254                 dev->hbm_state = MEI_HBM_IDLE;
 255                 dev_err(dev->dev, "waiting for mei start failed\n");
 256                 return -ETIME;
 257         }
 258         return 0;
 259 }
 260
 261 /**
 262  * mei_hbm_start_req - sends start request message.
 263  *
 264  * @dev: the device structure
 265  *
 266  * Return: 0 on success and < 0 on failure
 267  */
 268 int mei_hbm_start_req(struct mei_device *dev)
 269 {
 270         struct mei_msg_hdr mei_hdr;
 271         struct hbm_host_version_request start_req;
 272         const size_t len = sizeof(struct hbm_host_version_request);
 273         int ret;
 274
 275         mei_hbm_reset(dev);
 276
 277         mei_hbm_hdr(&mei_hdr, len);
 278
 279         /* host start message */
 280         memset(&start_req, 0, len);
 281         start_req.hbm_cmd = HOST_START_REQ_CMD;
 282         start_req.host_version.major_version = HBM_MAJOR_VERSION;
 283         start_req.host_version.minor_version = HBM_MINOR_VERSION;
 284
 285         dev->hbm_state = MEI_HBM_IDLE;
 286         ret = mei_hbm_write_message(dev, &mei_hdr, &start_req);
 287         if (ret) {
 288                 dev_err(dev->dev, "version message write failed: ret = %d\n",
 289                         ret);
 290                 return ret;
 291         }
 292
 293         dev->hbm_state = MEI_HBM_STARTING;
 294         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 295         mei_schedule_stall_timer(dev);
 296         return 0;
 297 }
 298
 299 /**
 300  * mei_hbm_dma_setup_req() - setup DMA request
 301  * @dev: the device structure
 302  *
 303  * Return: 0 on success and < 0 on failure
 304  */
 305 static int mei_hbm_dma_setup_req(struct mei_device *dev)
 306 {
 307         struct mei_msg_hdr mei_hdr;
 308         struct hbm_dma_setup_request req;
 309         const size_t len = sizeof(struct hbm_dma_setup_request);
 310         unsigned int i;
 311         int ret;
 312
 313         mei_hbm_hdr(&mei_hdr, len);
 314
 315         memset(&req, 0, len);
 316         req.hbm_cmd = MEI_HBM_DMA_SETUP_REQ_CMD;
 317         for (i = 0; i < DMA_DSCR_NUM; i++) {
 318                 phys_addr_t paddr;
 319
 320                 paddr = dev->dr_dscr[i].daddr;
 321                 req.dma_dscr[i].addr_hi = upper_32_bits(paddr);
 322                 req.dma_dscr[i].addr_lo = lower_32_bits(paddr);
 323                 req.dma_dscr[i].size = dev->dr_dscr[i].size;
 324         }
 325
 326         mei_dma_ring_reset(dev);
 327
 328         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 329         if (ret) {
 330                 dev_err(dev->dev, "dma setup request write failed: ret = %d.\n",
 331                         ret);
 332                 return ret;
 333         }
 334
 335         dev->hbm_state = MEI_HBM_DR_SETUP;
 336         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 337         mei_schedule_stall_timer(dev);
 338         return 0;
 339 }
 340
 341 /**
 342  * mei_hbm_enum_clients_req - sends enumeration client request message.
 343  *
 344  * @dev: the device structure
 345  *
 346  * Return: 0 on success and < 0 on failure
 347  */
 348 static int mei_hbm_enum_clients_req(struct mei_device *dev)
 349 {
 350         struct mei_msg_hdr mei_hdr;
 351         struct hbm_host_enum_request enum_req;
 352         const size_t len = sizeof(struct hbm_host_enum_request);
 353         int ret;
 354
 355         /* enumerate clients */
 356         mei_hbm_hdr(&mei_hdr, len);
 357
 358         memset(&enum_req, 0, len);
 359         enum_req.hbm_cmd = HOST_ENUM_REQ_CMD;
 360         enum_req.flags |= dev->hbm_f_dc_supported ?
 361                           MEI_HBM_ENUM_F_ALLOW_ADD : 0;
 362         enum_req.flags |= dev->hbm_f_ie_supported ?
 363                           MEI_HBM_ENUM_F_IMMEDIATE_ENUM : 0;
 364
 365         ret = mei_hbm_write_message(dev, &mei_hdr, &enum_req);
 366         if (ret) {
 367                 dev_err(dev->dev, "enumeration request write failed: ret = %d.\n",
 368                         ret);
 369                 return ret;
 370         }
 371         dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
 372         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 373         mei_schedule_stall_timer(dev);
 374         return 0;
 375 }
 376
 377 /**
 378  * mei_hbm_me_cl_add - add new me client to the list
 379  *
 380  * @dev: the device structure
 381  * @res: hbm property response
 382  *
 383  * Return: 0 on success and -ENOMEM on allocation failure
 384  */
 385
 386 static int mei_hbm_me_cl_add(struct mei_device *dev,
 387                              struct hbm_props_response *res)
 388 {
 389         struct mei_me_client *me_cl;
 390         const uuid_le *uuid = &res->client_properties.protocol_name;
 391
 392         mei_me_cl_rm_by_uuid(dev, uuid);
 393
 394         me_cl = kzalloc(sizeof(struct mei_me_client), GFP_KERNEL);
 395         if (!me_cl)
 396                 return -ENOMEM;
 397
 398         mei_me_cl_init(me_cl);
 399
 400         me_cl->props = res->client_properties;
 401         me_cl->client_id = res->me_addr;
 402         me_cl->tx_flow_ctrl_creds = 0;
 403
 404         mei_me_cl_add(dev, me_cl);
 405
 406         return 0;
 407 }
 408
 409 /**
 410  * mei_hbm_add_cl_resp - send response to fw on client add request
 411  *
 412  * @dev: the device structure
 413  * @addr: me address
 414  * @status: response status
 415  *
 416  * Return: 0 on success and < 0 on failure
 417  */
 418 static int mei_hbm_add_cl_resp(struct mei_device *dev, u8 addr, u8 status)
 419 {
 420         struct mei_msg_hdr mei_hdr;
 421         struct hbm_add_client_response resp;
 422         const size_t len = sizeof(struct hbm_add_client_response);
 423         int ret;
 424
 425         dev_dbg(dev->dev, "adding client response\n");
 426
 427         mei_hbm_hdr(&mei_hdr, len);
 428
 429         memset(&resp, 0, sizeof(struct hbm_add_client_response));
 430         resp.hbm_cmd = MEI_HBM_ADD_CLIENT_RES_CMD;
 431         resp.me_addr = addr;
 432         resp.status  = status;
 433
 434         ret = mei_hbm_write_message(dev, &mei_hdr, &resp);
 435         if (ret)
 436                 dev_err(dev->dev, "add client response write failed: ret = %d\n",
 437                         ret);
 438         return ret;
 439 }
 440
 441 /**
 442  * mei_hbm_fw_add_cl_req - request from the fw to add a client
 443  *
 444  * @dev: the device structure
 445  * @req: add client request
 446  *
 447  * Return: 0 on success and < 0 on failure
 448  */
 449 static int mei_hbm_fw_add_cl_req(struct mei_device *dev,
 450                               struct hbm_add_client_request *req)
 451 {
 452         int ret;
 453         u8 status = MEI_HBMS_SUCCESS;
 454
 455         BUILD_BUG_ON(sizeof(struct hbm_add_client_request) !=
 456                         sizeof(struct hbm_props_response));
 457
 458         ret = mei_hbm_me_cl_add(dev, (struct hbm_props_response *)req);
 459         if (ret)
 460                 status = !MEI_HBMS_SUCCESS;
 461
 462         if (dev->dev_state == MEI_DEV_ENABLED)
 463                 schedule_work(&dev->bus_rescan_work);
 464
 465         return mei_hbm_add_cl_resp(dev, req->me_addr, status);
 466 }
 467
 468 /**
 469  * mei_hbm_cl_notify_req - send notification request
 470  *
 471  * @dev: the device structure
 472  * @cl: a client to disconnect from
 473  * @start: true for start false for stop
 474  *
 475  * Return: 0 on success and -EIO on write failure
 476  */
 477 int mei_hbm_cl_notify_req(struct mei_device *dev,
 478                           struct mei_cl *cl, u8 start)
 479 {
 480
 481         struct mei_msg_hdr mei_hdr;
 482         struct hbm_notification_request req;
 483         const size_t len = sizeof(struct hbm_notification_request);
 484         int ret;
 485
 486         mei_hbm_hdr(&mei_hdr, len);
 487         mei_hbm_cl_hdr(cl, MEI_HBM_NOTIFY_REQ_CMD, &req, len);
 488
 489         req.start = start;
 490
 491         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 492         if (ret)
 493                 dev_err(dev->dev, "notify request failed: ret = %d\n", ret);
 494
 495         return ret;
 496 }
 497
 498 /**
 499  *  notify_res_to_fop - convert notification response to the proper
 500  *      notification FOP
 501  *
 502  * @cmd: client notification start response command
 503  *
 504  * Return:  MEI_FOP_NOTIFY_START or MEI_FOP_NOTIFY_STOP;
 505  */
 506 static inline enum mei_cb_file_ops notify_res_to_fop(struct mei_hbm_cl_cmd *cmd)
 507 {
 508         struct hbm_notification_response *rs =
 509                 (struct hbm_notification_response *)cmd;
 510
 511         return mei_cl_notify_req2fop(rs->start);
 512 }
 513
 514 /**
 515  * mei_hbm_cl_notify_start_res - update the client state according
 516  *       notify start response
 517  *
 518  * @dev: the device structure
 519  * @cl: mei host client
 520  * @cmd: client notification start response command
 521  */
 522 static void mei_hbm_cl_notify_start_res(struct mei_device *dev,
 523                                         struct mei_cl *cl,
 524                                         struct mei_hbm_cl_cmd *cmd)
 525 {
 526         struct hbm_notification_response *rs =
 527                 (struct hbm_notification_response *)cmd;
 528
 529         cl_dbg(dev, cl, "hbm: notify start response status=%d\n", rs->status);
 530
 531         if (rs->status == MEI_HBMS_SUCCESS ||
 532             rs->status == MEI_HBMS_ALREADY_STARTED) {
 533                 cl->notify_en = true;
 534                 cl->status = 0;
 535         } else {
 536                 cl->status = -EINVAL;
 537         }
 538 }
 539
 540 /**
 541  * mei_hbm_cl_notify_stop_res - update the client state according
 542  *       notify stop response
 543  *
 544  * @dev: the device structure
 545  * @cl: mei host client
 546  * @cmd: client notification stop response command
 547  */
 548 static void mei_hbm_cl_notify_stop_res(struct mei_device *dev,
 549                                        struct mei_cl *cl,
 550                                        struct mei_hbm_cl_cmd *cmd)
 551 {
 552         struct hbm_notification_response *rs =
 553                 (struct hbm_notification_response *)cmd;
 554
 555         cl_dbg(dev, cl, "hbm: notify stop response status=%d\n", rs->status);
 556
 557         if (rs->status == MEI_HBMS_SUCCESS ||
 558             rs->status == MEI_HBMS_NOT_STARTED) {
 559                 cl->notify_en = false;
 560                 cl->status = 0;
 561         } else {
 562                 /* TODO: spec is not clear yet about other possible issues */
 563                 cl->status = -EINVAL;
 564         }
 565 }
 566
 567 /**
 568  * mei_hbm_cl_notify - signal notification event
 569  *
 570  * @dev: the device structure
 571  * @cmd: notification client message
 572  */
 573 static void mei_hbm_cl_notify(struct mei_device *dev,
 574                               struct mei_hbm_cl_cmd *cmd)
 575 {
 576         struct mei_cl *cl;
 577
 578         cl = mei_hbm_cl_find_by_cmd(dev, cmd);
 579         if (cl)
 580                 mei_cl_notify(cl);
 581 }
 582
 583 /**
 584  * mei_hbm_prop_req - request property for a single client
 585  *
 586  * @dev: the device structure
 587  * @start_idx: client index to start search
 588  *
 589  * Return: 0 on success and < 0 on failure
 590  */
 591 static int mei_hbm_prop_req(struct mei_device *dev, unsigned long start_idx)
 592 {
 593         struct mei_msg_hdr mei_hdr;
 594         struct hbm_props_request prop_req;
 595         const size_t len = sizeof(struct hbm_props_request);
 596         unsigned long addr;
 597         int ret;
 598
 599         addr = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, start_idx);
 600
 601         /* We got all client properties */
 602         if (addr == MEI_CLIENTS_MAX) {
 603                 dev->hbm_state = MEI_HBM_STARTED;
 604                 mei_host_client_init(dev);
 605
 606                 return 0;
 607         }
 608
 609         mei_hbm_hdr(&mei_hdr, len);
 610
 611         memset(&prop_req, 0, sizeof(struct hbm_props_request));
 612
 613         prop_req.hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
 614         prop_req.me_addr = addr;
 615
 616         ret = mei_hbm_write_message(dev, &mei_hdr, &prop_req);
 617         if (ret) {
 618                 dev_err(dev->dev, "properties request write failed: ret = %d\n",
 619                         ret);
 620                 return ret;
 621         }
 622
 623         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 624         mei_schedule_stall_timer(dev);
 625
 626         return 0;
 627 }
 628
 629 /**
 630  * mei_hbm_pg - sends pg command
 631  *
 632  * @dev: the device structure
 633  * @pg_cmd: the pg command code
 634  *
 635  * Return: -EIO on write failure
 636  *         -EOPNOTSUPP if the operation is not supported by the protocol
 637  */
 638 int mei_hbm_pg(struct mei_device *dev, u8 pg_cmd)
 639 {
 640         struct mei_msg_hdr mei_hdr;
 641         struct hbm_power_gate req;
 642         const size_t len = sizeof(struct hbm_power_gate);
 643         int ret;
 644
 645         if (!dev->hbm_f_pg_supported)
 646                 return -EOPNOTSUPP;
 647
 648         mei_hbm_hdr(&mei_hdr, len);
 649
 650         memset(&req, 0, len);
 651         req.hbm_cmd = pg_cmd;
 652
 653         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 654         if (ret)
 655                 dev_err(dev->dev, "power gate command write failed.\n");
 656         return ret;
 657 }
 658 EXPORT_SYMBOL_GPL(mei_hbm_pg);
 659
 660 /**
 661  * mei_hbm_stop_req - send stop request message
 662  *
 663  * @dev: mei device
 664  *
 665  * Return: -EIO on write failure
 666  */
 667 static int mei_hbm_stop_req(struct mei_device *dev)
 668 {
 669         struct mei_msg_hdr mei_hdr;
 670         struct hbm_host_stop_request req;
 671         const size_t len = sizeof(struct hbm_host_stop_request);
 672
 673         mei_hbm_hdr(&mei_hdr, len);
 674
 675         memset(&req, 0, len);
 676         req.hbm_cmd = HOST_STOP_REQ_CMD;
 677         req.reason = DRIVER_STOP_REQUEST;
 678
 679         return mei_hbm_write_message(dev, &mei_hdr, &req);
 680 }
 681
 682 /**
 683  * mei_hbm_cl_flow_control_req - sends flow control request.
 684  *
 685  * @dev: the device structure
 686  * @cl: client info
 687  *
 688  * Return: -EIO on write failure
 689  */
 690 int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
 691 {
 692         struct hbm_flow_control req;
 693
 694         cl_dbg(dev, cl, "sending flow control\n");
 695         return mei_hbm_cl_write(dev, cl, MEI_FLOW_CONTROL_CMD,
 696                                 &req, sizeof(req));
 697 }
 698
 699 /**
 700  * mei_hbm_add_single_tx_flow_ctrl_creds - adds single buffer credentials.
 701  *
 702  * @dev: the device structure
 703  * @fctrl: flow control response bus message
 704  *
 705  * Return: 0 on success, < 0 otherwise
 706  */
 707 static int mei_hbm_add_single_tx_flow_ctrl_creds(struct mei_device *dev,
 708                                                  struct hbm_flow_control *fctrl)
 709 {
 710         struct mei_me_client *me_cl;
 711         int rets;
 712
 713         me_cl = mei_me_cl_by_id(dev, fctrl->me_addr);
 714         if (!me_cl) {
 715                 dev_err(dev->dev, "no such me client %d\n", fctrl->me_addr);
 716                 return -ENOENT;
 717         }
 718
 719         if (WARN_ON(me_cl->props.single_recv_buf == 0)) {
 720                 rets = -EINVAL;
 721                 goto out;
 722         }
 723
 724         me_cl->tx_flow_ctrl_creds++;
 725         dev_dbg(dev->dev, "recv flow ctrl msg ME %d (single) creds = %d.\n",
 726                 fctrl->me_addr, me_cl->tx_flow_ctrl_creds);
 727
 728         rets = 0;
 729 out:
 730         mei_me_cl_put(me_cl);
 731         return rets;
 732 }
 733
 734 /**
 735  * mei_hbm_cl_flow_control_res - flow control response from me
 736  *
 737  * @dev: the device structure
 738  * @fctrl: flow control response bus message
 739  */
 740 static void mei_hbm_cl_tx_flow_ctrl_creds_res(struct mei_device *dev,
 741                                                struct hbm_flow_control *fctrl)
 742 {
 743         struct mei_cl *cl;
 744
 745         if (!fctrl->host_addr) {
 746                 /* single receive buffer */
 747                 mei_hbm_add_single_tx_flow_ctrl_creds(dev, fctrl);
 748                 return;
 749         }
 750
 751         cl = mei_hbm_cl_find_by_cmd(dev, fctrl);
 752         if (cl) {
 753                 cl->tx_flow_ctrl_creds++;
 754                 cl_dbg(dev, cl, "flow control creds = %d.\n",
 755                                 cl->tx_flow_ctrl_creds);
 756         }
 757 }
 758
 759
 760 /**
 761  * mei_hbm_cl_disconnect_req - sends disconnect message to fw.
 762  *
 763  * @dev: the device structure
 764  * @cl: a client to disconnect from
 765  *
 766  * Return: -EIO on write failure
 767  */
 768 int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
 769 {
 770         struct hbm_client_connect_request req;
 771
 772         return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_REQ_CMD,
 773                                 &req, sizeof(req));
 774 }
 775
 776 /**
 777  * mei_hbm_cl_disconnect_rsp - sends disconnect respose to the FW
 778  *
 779  * @dev: the device structure
 780  * @cl: a client to disconnect from
 781  *
 782  * Return: -EIO on write failure
 783  */
 784 int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
 785 {
 786         struct hbm_client_connect_response resp;
 787
 788         return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_RES_CMD,
 789                                 &resp, sizeof(resp));
 790 }
 791
 792 /**
 793  * mei_hbm_cl_disconnect_res - update the client state according
 794  *       disconnect response
 795  *
 796  * @dev: the device structure
 797  * @cl: mei host client
 798  * @cmd: disconnect client response host bus message
 799  */
 800 static void mei_hbm_cl_disconnect_res(struct mei_device *dev, struct mei_cl *cl,
 801                                       struct mei_hbm_cl_cmd *cmd)
 802 {
 803         struct hbm_client_connect_response *rs =
 804                 (struct hbm_client_connect_response *)cmd;
 805
 806         cl_dbg(dev, cl, "hbm: disconnect response status=%d\n", rs->status);
 807
 808         if (rs->status == MEI_CL_DISCONN_SUCCESS)
 809                 cl->state = MEI_FILE_DISCONNECT_REPLY;
 810         cl->status = 0;
 811 }
 812
 813 /**
 814  * mei_hbm_cl_connect_req - send connection request to specific me client
 815  *
 816  * @dev: the device structure
 817  * @cl: a client to connect to
 818  *
 819  * Return: -EIO on write failure
 820  */
 821 int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
 822 {
 823         struct hbm_client_connect_request req;
 824
 825         return mei_hbm_cl_write(dev, cl, CLIENT_CONNECT_REQ_CMD,
 826                                 &req, sizeof(req));
 827 }
 828
 829 /**
 830  * mei_hbm_cl_connect_res - update the client state according
 831  *        connection response
 832  *
 833  * @dev: the device structure
 834  * @cl: mei host client
 835  * @cmd: connect client response host bus message
 836  */
 837 static void mei_hbm_cl_connect_res(struct mei_device *dev, struct mei_cl *cl,
 838                                    struct mei_hbm_cl_cmd *cmd)
 839 {
 840         struct hbm_client_connect_response *rs =
 841                 (struct hbm_client_connect_response *)cmd;
 842
 843         cl_dbg(dev, cl, "hbm: connect response status=%s\n",
 844                         mei_cl_conn_status_str(rs->status));
 845
 846         if (rs->status == MEI_CL_CONN_SUCCESS)
 847                 cl->state = MEI_FILE_CONNECTED;
 848         else {
 849                 cl->state = MEI_FILE_DISCONNECT_REPLY;
 850                 if (rs->status == MEI_CL_CONN_NOT_FOUND) {
 851                         mei_me_cl_del(dev, cl->me_cl);
 852                         if (dev->dev_state == MEI_DEV_ENABLED)
 853                                 schedule_work(&dev->bus_rescan_work);
 854                 }
 855         }
 856         cl->status = mei_cl_conn_status_to_errno(rs->status);
 857 }
 858
 859 /**
 860  * mei_hbm_cl_res - process hbm response received on behalf
 861  *         an client
 862  *
 863  * @dev: the device structure
 864  * @rs:  hbm client message
 865  * @fop_type: file operation type
 866  */
 867 static void mei_hbm_cl_res(struct mei_device *dev,
 868                            struct mei_hbm_cl_cmd *rs,
 869                            enum mei_cb_file_ops fop_type)
 870 {
 871         struct mei_cl *cl;
 872         struct mei_cl_cb *cb, *next;
 873
 874         cl = NULL;
 875         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
 876
 877                 cl = cb->cl;
 878
 879                 if (cb->fop_type != fop_type)
 880                         continue;
 881
 882                 if (mei_hbm_cl_addr_equal(cl, rs)) {
 883                         list_del_init(&cb->list);
 884                         break;
 885                 }
 886         }
 887
 888         if (!cl)
 889                 return;
 890
 891         switch (fop_type) {
 892         case MEI_FOP_CONNECT:
 893                 mei_hbm_cl_connect_res(dev, cl, rs);
 894                 break;
 895         case MEI_FOP_DISCONNECT:
 896                 mei_hbm_cl_disconnect_res(dev, cl, rs);
 897                 break;
 898         case MEI_FOP_NOTIFY_START:
 899                 mei_hbm_cl_notify_start_res(dev, cl, rs);
 900                 break;
 901         case MEI_FOP_NOTIFY_STOP:
 902                 mei_hbm_cl_notify_stop_res(dev, cl, rs);
 903                 break;
 904         default:
 905                 return;
 906         }
 907
 908         cl->timer_count = 0;
 909         wake_up(&cl->wait);
 910 }
 911
 912
 913 /**
 914  * mei_hbm_fw_disconnect_req - disconnect request initiated by ME firmware
 915  *  host sends disconnect response
 916  *
 917  * @dev: the device structure.
 918  * @disconnect_req: disconnect request bus message from the me
 919  *
 920  * Return: -ENOMEM on allocation failure
 921  */
 922 static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
 923                 struct hbm_client_connect_request *disconnect_req)
 924 {
 925         struct mei_cl *cl;
 926         struct mei_cl_cb *cb;
 927
 928         cl = mei_hbm_cl_find_by_cmd(dev, disconnect_req);
 929         if (cl) {
 930                 cl_warn(dev, cl, "fw disconnect request received\n");
 931                 cl->state = MEI_FILE_DISCONNECTING;
 932                 cl->timer_count = 0;
 933
 934                 cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DISCONNECT_RSP,
 935                                                NULL);
 936                 if (!cb)
 937                         return -ENOMEM;
 938         }
 939         return 0;
 940 }
 941
 942 /**
 943  * mei_hbm_pg_enter_res - PG enter response received
 944  *
 945  * @dev: the device structure.
 946  *
 947  * Return: 0 on success, -EPROTO on state mismatch
 948  */
 949 static int mei_hbm_pg_enter_res(struct mei_device *dev)
 950 {
 951         if (mei_pg_state(dev) != MEI_PG_OFF ||
 952             dev->pg_event != MEI_PG_EVENT_WAIT) {
 953                 dev_err(dev->dev, "hbm: pg entry response: state mismatch [%s, %d]\n",
 954                         mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
 955                 return -EPROTO;
 956         }
 957
 958         dev->pg_event = MEI_PG_EVENT_RECEIVED;
 959         wake_up(&dev->wait_pg);
 960
 961         return 0;
 962 }
 963
 964 /**
 965  * mei_hbm_pg_resume - process with PG resume
 966  *
 967  * @dev: the device structure.
 968  */
 969 void mei_hbm_pg_resume(struct mei_device *dev)
 970 {
 971         pm_request_resume(dev->dev);
 972 }
 973 EXPORT_SYMBOL_GPL(mei_hbm_pg_resume);
 974
 975 /**
 976  * mei_hbm_pg_exit_res - PG exit response received
 977  *
 978  * @dev: the device structure.
 979  *
 980  * Return: 0 on success, -EPROTO on state mismatch
 981  */
 982 static int mei_hbm_pg_exit_res(struct mei_device *dev)
 983 {
 984         if (mei_pg_state(dev) != MEI_PG_ON ||
 985             (dev->pg_event != MEI_PG_EVENT_WAIT &&
 986              dev->pg_event != MEI_PG_EVENT_IDLE)) {
 987                 dev_err(dev->dev, "hbm: pg exit response: state mismatch [%s, %d]\n",
 988                         mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
 989                 return -EPROTO;
 990         }
 991
 992         switch (dev->pg_event) {
 993         case MEI_PG_EVENT_WAIT:
 994                 dev->pg_event = MEI_PG_EVENT_RECEIVED;
 995                 wake_up(&dev->wait_pg);
 996                 break;
 997         case MEI_PG_EVENT_IDLE:
 998                 /*
 999                 * If the driver is not waiting on this then
1000                 * this is HW initiated exit from PG.
1001                 * Start runtime pm resume sequence to exit from PG.
1002                 */
1003                 dev->pg_event = MEI_PG_EVENT_RECEIVED;
1004                 mei_hbm_pg_resume(dev);
1005                 break;
1006         default:
1007                 WARN(1, "hbm: pg exit response: unexpected pg event = %d\n",
1008                      dev->pg_event);
1009                 return -EPROTO;
1010         }
1011
1012         return 0;
1013 }
1014
1015 /**
1016  * mei_hbm_config_features - check what hbm features and commands
1017  *        are supported by the fw
1018  *
1019  * @dev: the device structure
1020  */
1021 static void mei_hbm_config_features(struct mei_device *dev)
1022 {
1023         /* Power Gating Isolation Support */
1024         dev->hbm_f_pg_supported = 0;
1025         if (dev->version.major_version > HBM_MAJOR_VERSION_PGI)
1026                 dev->hbm_f_pg_supported = 1;
1027
1028         if (dev->version.major_version == HBM_MAJOR_VERSION_PGI &&
1029             dev->version.minor_version >= HBM_MINOR_VERSION_PGI)
1030                 dev->hbm_f_pg_supported = 1;
1031
1032         dev->hbm_f_dc_supported = 0;
1033         if (dev->version.major_version >= HBM_MAJOR_VERSION_DC)
1034                 dev->hbm_f_dc_supported = 1;
1035
1036         dev->hbm_f_ie_supported = 0;
1037         if (dev->version.major_version >= HBM_MAJOR_VERSION_IE)
1038                 dev->hbm_f_ie_supported = 1;
1039
1040         /* disconnect on connect timeout instead of link reset */
1041         dev->hbm_f_dot_supported = 0;
1042         if (dev->version.major_version >= HBM_MAJOR_VERSION_DOT)
1043                 dev->hbm_f_dot_supported = 1;
1044
1045         /* Notification Event Support */
1046         dev->hbm_f_ev_supported = 0;
1047         if (dev->version.major_version >= HBM_MAJOR_VERSION_EV)
1048                 dev->hbm_f_ev_supported = 1;
1049
1050         /* Fixed Address Client Support */
1051         dev->hbm_f_fa_supported = 0;
1052         if (dev->version.major_version >= HBM_MAJOR_VERSION_FA)
1053                 dev->hbm_f_fa_supported = 1;
1054
1055         /* OS ver message Support */
1056         dev->hbm_f_os_supported = 0;
1057         if (dev->version.major_version >= HBM_MAJOR_VERSION_OS)
1058                 dev->hbm_f_os_supported = 1;
1059
1060         /* DMA Ring Support */
1061         dev->hbm_f_dr_supported = 0;
1062         if (dev->version.major_version > HBM_MAJOR_VERSION_DR ||
1063             (dev->version.major_version == HBM_MAJOR_VERSION_DR &&
1064              dev->version.minor_version >= HBM_MINOR_VERSION_DR))
1065                 dev->hbm_f_dr_supported = 1;
1066 }
1067
1068 /**
1069  * mei_hbm_version_is_supported - checks whether the driver can
1070  *     support the hbm version of the device
1071  *
1072  * @dev: the device structure
1073  * Return: true if driver can support hbm version of the device
1074  */
1075 bool mei_hbm_version_is_supported(struct mei_device *dev)
1076 {
1077         return  (dev->version.major_version < HBM_MAJOR_VERSION) ||
1078                 (dev->version.major_version == HBM_MAJOR_VERSION &&
1079                  dev->version.minor_version <= HBM_MINOR_VERSION);
1080 }
1081
1082 /**
1083  * mei_hbm_dispatch - bottom half read routine after ISR to
1084  * handle the read bus message cmd processing.
1085  *
1086  * @dev: the device structure
1087  * @hdr: header of bus message
1088  *
1089  * Return: 0 on success and < 0 on failure
1090  */
1091 int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
1092 {
1093         struct mei_bus_message *mei_msg;
1094         struct hbm_host_version_response *version_res;
1095         struct hbm_props_response *props_res;
1096         struct hbm_host_enum_response *enum_res;
1097         struct hbm_dma_setup_response *dma_setup_res;
1098         struct hbm_add_client_request *add_cl_req;
1099         int ret;
1100
1101         struct mei_hbm_cl_cmd *cl_cmd;
1102         struct hbm_client_connect_request *disconnect_req;
1103         struct hbm_flow_control *fctrl;
1104
1105         /* read the message to our buffer */
1106         BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
1107         mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
1108         mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
1109         cl_cmd  = (struct mei_hbm_cl_cmd *)mei_msg;
1110
1111         /* ignore spurious message and prevent reset nesting
1112          * hbm is put to idle during system reset
1113          */
1114         if (dev->hbm_state == MEI_HBM_IDLE) {
1115                 dev_dbg(dev->dev, "hbm: state is idle ignore spurious messages\n");
1116                 return 0;
1117         }
1118
1119         switch (mei_msg->hbm_cmd) {
1120         case HOST_START_RES_CMD:
1121                 dev_dbg(dev->dev, "hbm: start: response message received.\n");
1122
1123                 dev->init_clients_timer = 0;
1124
1125                 version_res = (struct hbm_host_version_response *)mei_msg;
1126
1127                 dev_dbg(dev->dev, "HBM VERSION: DRIVER=%02d:%02d DEVICE=%02d:%02d\n",
1128                                 HBM_MAJOR_VERSION, HBM_MINOR_VERSION,
1129                                 version_res->me_max_version.major_version,
1130                                 version_res->me_max_version.minor_version);
1131
1132                 if (version_res->host_version_supported) {
1133                         dev->version.major_version = HBM_MAJOR_VERSION;
1134                         dev->version.minor_version = HBM_MINOR_VERSION;
1135                 } else {
1136                         dev->version.major_version =
1137                                 version_res->me_max_version.major_version;
1138                         dev->version.minor_version =
1139                                 version_res->me_max_version.minor_version;
1140                 }
1141
1142                 if (!mei_hbm_version_is_supported(dev)) {
1143                         dev_warn(dev->dev, "hbm: start: version mismatch - stopping the driver.\n");
1144
1145                         dev->hbm_state = MEI_HBM_STOPPED;
1146                         if (mei_hbm_stop_req(dev)) {
1147                                 dev_err(dev->dev, "hbm: start: failed to send stop request\n");
1148                                 return -EIO;
1149                         }
1150                         break;
1151                 }
1152
1153                 mei_hbm_config_features(dev);
1154
1155                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1156                     dev->hbm_state != MEI_HBM_STARTING) {
1157                         dev_err(dev->dev, "hbm: start: state mismatch, [%d, %d]\n",
1158                                 dev->dev_state, dev->hbm_state);
1159                         return -EPROTO;
1160                 }
1161
1162                 if (dev->hbm_f_dr_supported) {
1163                         if (mei_dmam_ring_alloc(dev))
1164                                 dev_info(dev->dev, "running w/o dma ring\n");
1165                         if (mei_dma_ring_is_allocated(dev)) {
1166                                 if (mei_hbm_dma_setup_req(dev))
1167                                         return -EIO;
1168
1169                                 wake_up(&dev->wait_hbm_start);
1170                                 break;
1171                         }
1172                 }
1173
1174                 dev->hbm_f_dr_supported = 0;
1175                 mei_dmam_ring_free(dev);
1176
1177                 if (mei_hbm_enum_clients_req(dev))
1178                         return -EIO;
1179
1180                 wake_up(&dev->wait_hbm_start);
1181                 break;
1182
1183         case MEI_HBM_DMA_SETUP_RES_CMD:
1184                 dev_dbg(dev->dev, "hbm: dma setup response: message received.\n");
1185
1186                 dev->init_clients_timer = 0;
1187
1188                 if (dev->hbm_state != MEI_HBM_DR_SETUP) {
1189                         dev_err(dev->dev, "hbm: dma setup response: state mismatch, [%d, %d]\n",
1190                                 dev->dev_state, dev->hbm_state);
1191                         return -EPROTO;
1192                 }
1193
1194                 dma_setup_res = (struct hbm_dma_setup_response *)mei_msg;
1195
1196                 if (dma_setup_res->status) {
1197                         u8 status = dma_setup_res->status;
1198
1199                         if (status == MEI_HBMS_NOT_ALLOWED) {
1200                                 dev_dbg(dev->dev, "hbm: dma setup not allowed\n");
1201                         } else {
1202                                 dev_info(dev->dev, "hbm: dma setup response: failure = %d %s\n",
1203                                          status,
1204                                          mei_hbm_status_str(status));
1205                         }
1206                         dev->hbm_f_dr_supported = 0;
1207                         mei_dmam_ring_free(dev);
1208                 }
1209
1210                 if (mei_hbm_enum_clients_req(dev))
1211                         return -EIO;
1212                 break;
1213
1214         case CLIENT_CONNECT_RES_CMD:
1215                 dev_dbg(dev->dev, "hbm: client connect response: message received.\n");
1216                 mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_CONNECT);
1217                 break;
1218
1219         case CLIENT_DISCONNECT_RES_CMD:
1220                 dev_dbg(dev->dev, "hbm: client disconnect response: message received.\n");
1221                 mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_DISCONNECT);
1222                 break;
1223
1224         case MEI_FLOW_CONTROL_CMD:
1225                 dev_dbg(dev->dev, "hbm: client flow control response: message received.\n");
1226
1227                 fctrl = (struct hbm_flow_control *)mei_msg;
1228                 mei_hbm_cl_tx_flow_ctrl_creds_res(dev, fctrl);
1229                 break;
1230
1231         case MEI_PG_ISOLATION_ENTRY_RES_CMD:
1232                 dev_dbg(dev->dev, "hbm: power gate isolation entry response received\n");
1233                 ret = mei_hbm_pg_enter_res(dev);
1234                 if (ret)
1235                         return ret;
1236                 break;
1237
1238         case MEI_PG_ISOLATION_EXIT_REQ_CMD:
1239                 dev_dbg(dev->dev, "hbm: power gate isolation exit request received\n");
1240                 ret = mei_hbm_pg_exit_res(dev);
1241                 if (ret)
1242                         return ret;
1243                 break;
1244
1245         case HOST_CLIENT_PROPERTIES_RES_CMD:
1246                 dev_dbg(dev->dev, "hbm: properties response: message received.\n");
1247
1248                 dev->init_clients_timer = 0;
1249
1250                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1251                     dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
1252                         dev_err(dev->dev, "hbm: properties response: state mismatch, [%d, %d]\n",
1253                                 dev->dev_state, dev->hbm_state);
1254                         return -EPROTO;
1255                 }
1256
1257                 props_res = (struct hbm_props_response *)mei_msg;
1258
1259                 if (props_res->status == MEI_HBMS_CLIENT_NOT_FOUND) {
1260                         dev_dbg(dev->dev, "hbm: properties response: %d CLIENT_NOT_FOUND\n",
1261                                 props_res->me_addr);
1262                 } else if (props_res->status) {
1263                         dev_err(dev->dev, "hbm: properties response: wrong status = %d %s\n",
1264                                 props_res->status,
1265                                 mei_hbm_status_str(props_res->status));
1266                         return -EPROTO;
1267                 } else {
1268                         mei_hbm_me_cl_add(dev, props_res);
1269                 }
1270
1271                 /* request property for the next client */
1272                 if (mei_hbm_prop_req(dev, props_res->me_addr + 1))
1273                         return -EIO;
1274
1275                 break;
1276
1277         case HOST_ENUM_RES_CMD:
1278                 dev_dbg(dev->dev, "hbm: enumeration response: message received\n");
1279
1280                 dev->init_clients_timer = 0;
1281
1282                 enum_res = (struct hbm_host_enum_response *) mei_msg;
1283                 BUILD_BUG_ON(sizeof(dev->me_clients_map)
1284                                 < sizeof(enum_res->valid_addresses));
1285                 memcpy(dev->me_clients_map, enum_res->valid_addresses,
1286                                 sizeof(enum_res->valid_addresses));
1287
1288                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1289                     dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
1290                         dev_err(dev->dev, "hbm: enumeration response: state mismatch, [%d, %d]\n",
1291                                 dev->dev_state, dev->hbm_state);
1292                         return -EPROTO;
1293                 }
1294
1295                 dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
1296
1297                 /* first property request */
1298                 if (mei_hbm_prop_req(dev, 0))
1299                         return -EIO;
1300
1301                 break;
1302
1303         case HOST_STOP_RES_CMD:
1304                 dev_dbg(dev->dev, "hbm: stop response: message received\n");
1305
1306                 dev->init_clients_timer = 0;
1307
1308                 if (dev->hbm_state != MEI_HBM_STOPPED) {
1309                         dev_err(dev->dev, "hbm: stop response: state mismatch, [%d, %d]\n",
1310                                 dev->dev_state, dev->hbm_state);
1311                         return -EPROTO;
1312                 }
1313
1314                 dev->dev_state = MEI_DEV_POWER_DOWN;
1315                 dev_info(dev->dev, "hbm: stop response: resetting.\n");
1316                 /* force the reset */
1317                 return -EPROTO;
1318                 break;
1319
1320         case CLIENT_DISCONNECT_REQ_CMD:
1321                 dev_dbg(dev->dev, "hbm: disconnect request: message received\n");
1322
1323                 disconnect_req = (struct hbm_client_connect_request *)mei_msg;
1324                 mei_hbm_fw_disconnect_req(dev, disconnect_req);
1325                 break;
1326
1327         case ME_STOP_REQ_CMD:
1328                 dev_dbg(dev->dev, "hbm: stop request: message received\n");
1329                 dev->hbm_state = MEI_HBM_STOPPED;
1330                 if (mei_hbm_stop_req(dev)) {
1331                         dev_err(dev->dev, "hbm: stop request: failed to send stop request\n");
1332                         return -EIO;
1333                 }
1334                 break;
1335
1336         case MEI_HBM_ADD_CLIENT_REQ_CMD:
1337                 dev_dbg(dev->dev, "hbm: add client request received\n");
1338                 /*
1339                  * after the host receives the enum_resp
1340                  * message clients may be added or removed
1341                  */
1342                 if (dev->hbm_state <= MEI_HBM_ENUM_CLIENTS ||
1343                     dev->hbm_state >= MEI_HBM_STOPPED) {
1344                         dev_err(dev->dev, "hbm: add client: state mismatch, [%d, %d]\n",
1345                                 dev->dev_state, dev->hbm_state);
1346                         return -EPROTO;
1347                 }
1348                 add_cl_req = (struct hbm_add_client_request *)mei_msg;
1349                 ret = mei_hbm_fw_add_cl_req(dev, add_cl_req);
1350                 if (ret) {
1351                         dev_err(dev->dev, "hbm: add client: failed to send response %d\n",
1352                                 ret);
1353                         return -EIO;
1354                 }
1355                 dev_dbg(dev->dev, "hbm: add client request processed\n");
1356                 break;
1357
1358         case MEI_HBM_NOTIFY_RES_CMD:
1359                 dev_dbg(dev->dev, "hbm: notify response received\n");
1360                 mei_hbm_cl_res(dev, cl_cmd, notify_res_to_fop(cl_cmd));
1361                 break;
1362
1363         case MEI_HBM_NOTIFICATION_CMD:
1364                 dev_dbg(dev->dev, "hbm: notification\n");
1365                 mei_hbm_cl_notify(dev, cl_cmd);
1366                 break;
1367
1368         default:
1369                 WARN(1, "hbm: wrong command %d\n", mei_msg->hbm_cmd);
1370                 return -EPROTO;
1371
1372         }
1373         return 0;
1374 }
1375