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         default: return "unknown";
  56         }
  57 #undef MEI_CL_CCS
  58 }
  59
  60 const char *mei_hbm_state_str(enum mei_hbm_state state)
  61 {
  62 #define MEI_HBM_STATE(state) case MEI_HBM_##state: return #state
  63         switch (state) {
  64         MEI_HBM_STATE(IDLE);
  65         MEI_HBM_STATE(STARTING);
  66         MEI_HBM_STATE(STARTED);
  67         MEI_HBM_STATE(ENUM_CLIENTS);
  68         MEI_HBM_STATE(CLIENT_PROPERTIES);
  69         MEI_HBM_STATE(STOPPED);
  70         default:
  71                 return "unknown";
  72         }
  73 #undef MEI_HBM_STATE
  74 }
  75
  76 /**
  77  * mei_cl_conn_status_to_errno - convert client connect response
  78  * status to error code
  79  *
  80  * @status: client connect response status
  81  *
  82  * Return: corresponding error code
  83  */
  84 static int mei_cl_conn_status_to_errno(enum mei_cl_connect_status status)
  85 {
  86         switch (status) {
  87         case MEI_CL_CONN_SUCCESS:          return 0;
  88         case MEI_CL_CONN_NOT_FOUND:        return -ENOTTY;
  89         case MEI_CL_CONN_ALREADY_STARTED:  return -EBUSY;
  90         case MEI_CL_CONN_OUT_OF_RESOURCES: return -EBUSY;
  91         case MEI_CL_CONN_MESSAGE_SMALL:    return -EINVAL;
  92         default:                           return -EINVAL;
  93         }
  94 }
  95
  96 /**
  97  * mei_hbm_idle - set hbm to idle state
  98  *
  99  * @dev: the device structure
 100  */
 101 void mei_hbm_idle(struct mei_device *dev)
 102 {
 103         dev->init_clients_timer = 0;
 104         dev->hbm_state = MEI_HBM_IDLE;
 105 }
 106
 107 /**
 108  * mei_hbm_reset - reset hbm counters and book keeping data structurs
 109  *
 110  * @dev: the device structure
 111  */
 112 void mei_hbm_reset(struct mei_device *dev)
 113 {
 114         dev->me_client_index = 0;
 115
 116         mei_me_cl_rm_all(dev);
 117
 118         mei_hbm_idle(dev);
 119 }
 120
 121 /**
 122  * mei_hbm_hdr - construct hbm header
 123  *
 124  * @hdr: hbm header
 125  * @length: payload length
 126  */
 127
 128 static inline void mei_hbm_hdr(struct mei_msg_hdr *hdr, size_t length)
 129 {
 130         hdr->host_addr = 0;
 131         hdr->me_addr = 0;
 132         hdr->length = length;
 133         hdr->msg_complete = 1;
 134         hdr->reserved = 0;
 135 }
 136
 137 /**
 138  * mei_hbm_cl_hdr - construct client hbm header
 139  *
 140  * @cl: client
 141  * @hbm_cmd: host bus message command
 142  * @buf: buffer for cl header
 143  * @len: buffer length
 144  */
 145 static inline
 146 void mei_hbm_cl_hdr(struct mei_cl *cl, u8 hbm_cmd, void *buf, size_t len)
 147 {
 148         struct mei_hbm_cl_cmd *cmd = buf;
 149
 150         memset(cmd, 0, len);
 151
 152         cmd->hbm_cmd = hbm_cmd;
 153         cmd->host_addr = cl->host_client_id;
 154         cmd->me_addr = cl->me_client_id;
 155 }
 156
 157 /**
 158  * mei_hbm_cl_write - write simple hbm client message
 159  *
 160  * @dev: the device structure
 161  * @cl: client
 162  * @hbm_cmd: host bus message command
 163  * @len: buffer length
 164  *
 165  * Return: 0 on success, <0 on failure.
 166  */
 167 static inline
 168 int mei_hbm_cl_write(struct mei_device *dev,
 169                      struct mei_cl *cl, u8 hbm_cmd, size_t len)
 170 {
 171         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 172
 173         mei_hbm_hdr(mei_hdr, len);
 174         mei_hbm_cl_hdr(cl, hbm_cmd, dev->wr_msg.data, len);
 175
 176         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 177 }
 178
 179 /**
 180  * mei_hbm_cl_addr_equal - check if the client's and
 181  *      the message address match
 182  *
 183  * @cl: client
 184  * @cmd: hbm client message
 185  *
 186  * Return: true if addresses are the same
 187  */
 188 static inline
 189 bool mei_hbm_cl_addr_equal(struct mei_cl *cl, struct mei_hbm_cl_cmd *cmd)
 190 {
 191         return cl->host_client_id == cmd->host_addr &&
 192                 cl->me_client_id == cmd->me_addr;
 193 }
 194
 195 /**
 196  * mei_hbm_cl_find_by_cmd - find recipient client
 197  *
 198  * @dev: the device structure
 199  * @buf: a buffer with hbm cl command
 200  *
 201  * Return: the recipient client or NULL if not found
 202  */
 203 static inline
 204 struct mei_cl *mei_hbm_cl_find_by_cmd(struct mei_device *dev, void *buf)
 205 {
 206         struct mei_hbm_cl_cmd *cmd = (struct mei_hbm_cl_cmd *)buf;
 207         struct mei_cl *cl;
 208
 209         list_for_each_entry(cl, &dev->file_list, link)
 210                 if (mei_hbm_cl_addr_equal(cl, cmd))
 211                         return cl;
 212         return NULL;
 213 }
 214
 215
 216 /**
 217  * mei_hbm_start_wait - wait for start response message.
 218  *
 219  * @dev: the device structure
 220  *
 221  * Return: 0 on success and < 0 on failure
 222  */
 223 int mei_hbm_start_wait(struct mei_device *dev)
 224 {
 225         int ret;
 226
 227         if (dev->hbm_state > MEI_HBM_STARTING)
 228                 return 0;
 229
 230         mutex_unlock(&dev->device_lock);
 231         ret = wait_event_timeout(dev->wait_hbm_start,
 232                         dev->hbm_state != MEI_HBM_STARTING,
 233                         mei_secs_to_jiffies(MEI_HBM_TIMEOUT));
 234         mutex_lock(&dev->device_lock);
 235
 236         if (ret == 0 && (dev->hbm_state <= MEI_HBM_STARTING)) {
 237                 dev->hbm_state = MEI_HBM_IDLE;
 238                 dev_err(dev->dev, "waiting for mei start failed\n");
 239                 return -ETIME;
 240         }
 241         return 0;
 242 }
 243
 244 /**
 245  * mei_hbm_start_req - sends start request message.
 246  *
 247  * @dev: the device structure
 248  *
 249  * Return: 0 on success and < 0 on failure
 250  */
 251 int mei_hbm_start_req(struct mei_device *dev)
 252 {
 253         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 254         struct hbm_host_version_request *start_req;
 255         const size_t len = sizeof(struct hbm_host_version_request);
 256         int ret;
 257
 258         mei_hbm_reset(dev);
 259
 260         mei_hbm_hdr(mei_hdr, len);
 261
 262         /* host start message */
 263         start_req = (struct hbm_host_version_request *)dev->wr_msg.data;
 264         memset(start_req, 0, len);
 265         start_req->hbm_cmd = HOST_START_REQ_CMD;
 266         start_req->host_version.major_version = HBM_MAJOR_VERSION;
 267         start_req->host_version.minor_version = HBM_MINOR_VERSION;
 268
 269         dev->hbm_state = MEI_HBM_IDLE;
 270         ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 271         if (ret) {
 272                 dev_err(dev->dev, "version message write failed: ret = %d\n",
 273                         ret);
 274                 return ret;
 275         }
 276
 277         dev->hbm_state = MEI_HBM_STARTING;
 278         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 279         return 0;
 280 }
 281
 282 /*
 283  * mei_hbm_enum_clients_req - sends enumeration client request message.
 284  *
 285  * @dev: the device structure
 286  *
 287  * Return: 0 on success and < 0 on failure
 288  */
 289 static int mei_hbm_enum_clients_req(struct mei_device *dev)
 290 {
 291         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 292         struct hbm_host_enum_request *enum_req;
 293         const size_t len = sizeof(struct hbm_host_enum_request);
 294         int ret;
 295
 296         /* enumerate clients */
 297         mei_hbm_hdr(mei_hdr, len);
 298
 299         enum_req = (struct hbm_host_enum_request *)dev->wr_msg.data;
 300         memset(enum_req, 0, len);
 301         enum_req->hbm_cmd = HOST_ENUM_REQ_CMD;
 302
 303         ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 304         if (ret) {
 305                 dev_err(dev->dev, "enumeration request write failed: ret = %d.\n",
 306                         ret);
 307                 return ret;
 308         }
 309         dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
 310         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 311         return 0;
 312 }
 313
 314 /*
 315  * mei_hbm_me_cl_add - add new me client to the list
 316  *
 317  * @dev: the device structure
 318  * @res: hbm property response
 319  *
 320  * Return: 0 on success and -ENOMEM on allocation failure
 321  */
 322
 323 static int mei_hbm_me_cl_add(struct mei_device *dev,
 324                              struct hbm_props_response *res)
 325 {
 326         struct mei_me_client *me_cl;
 327         const uuid_le *uuid = &res->client_properties.protocol_name;
 328
 329         mei_me_cl_rm_by_uuid(dev, uuid);
 330
 331         me_cl = kzalloc(sizeof(struct mei_me_client), GFP_KERNEL);
 332         if (!me_cl)
 333                 return -ENOMEM;
 334
 335         mei_me_cl_init(me_cl);
 336
 337         me_cl->props = res->client_properties;
 338         me_cl->client_id = res->me_addr;
 339         me_cl->mei_flow_ctrl_creds = 0;
 340
 341         mei_me_cl_add(dev, me_cl);
 342
 343         return 0;
 344 }
 345
 346 /**
 347  * mei_hbm_prop_req - request property for a single client
 348  *
 349  * @dev: the device structure
 350  *
 351  * Return: 0 on success and < 0 on failure
 352  */
 353
 354 static int mei_hbm_prop_req(struct mei_device *dev)
 355 {
 356
 357         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 358         struct hbm_props_request *prop_req;
 359         const size_t len = sizeof(struct hbm_props_request);
 360         unsigned long next_client_index;
 361         int ret;
 362
 363         next_client_index = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX,
 364                                           dev->me_client_index);
 365
 366         /* We got all client properties */
 367         if (next_client_index == MEI_CLIENTS_MAX) {
 368                 dev->hbm_state = MEI_HBM_STARTED;
 369                 schedule_work(&dev->init_work);
 370
 371                 return 0;
 372         }
 373
 374         mei_hbm_hdr(mei_hdr, len);
 375         prop_req = (struct hbm_props_request *)dev->wr_msg.data;
 376
 377         memset(prop_req, 0, sizeof(struct hbm_props_request));
 378
 379         prop_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
 380         prop_req->me_addr = next_client_index;
 381
 382         ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 383         if (ret) {
 384                 dev_err(dev->dev, "properties request write failed: ret = %d\n",
 385                         ret);
 386                 return ret;
 387         }
 388
 389         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 390         dev->me_client_index = next_client_index;
 391
 392         return 0;
 393 }
 394
 395 /*
 396  * mei_hbm_pg - sends pg command
 397  *
 398  * @dev: the device structure
 399  * @pg_cmd: the pg command code
 400  *
 401  * Return: -EIO on write failure
 402  *         -EOPNOTSUPP if the operation is not supported by the protocol
 403  */
 404 int mei_hbm_pg(struct mei_device *dev, u8 pg_cmd)
 405 {
 406         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 407         struct hbm_power_gate *req;
 408         const size_t len = sizeof(struct hbm_power_gate);
 409         int ret;
 410
 411         if (!dev->hbm_f_pg_supported)
 412                 return -EOPNOTSUPP;
 413
 414         mei_hbm_hdr(mei_hdr, len);
 415
 416         req = (struct hbm_power_gate *)dev->wr_msg.data;
 417         memset(req, 0, len);
 418         req->hbm_cmd = pg_cmd;
 419
 420         ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 421         if (ret)
 422                 dev_err(dev->dev, "power gate command write failed.\n");
 423         return ret;
 424 }
 425 EXPORT_SYMBOL_GPL(mei_hbm_pg);
 426
 427 /**
 428  * mei_hbm_stop_req - send stop request message
 429  *
 430  * @dev: mei device
 431  *
 432  * Return: -EIO on write failure
 433  */
 434 static int mei_hbm_stop_req(struct mei_device *dev)
 435 {
 436         struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
 437         struct hbm_host_stop_request *req =
 438                         (struct hbm_host_stop_request *)dev->wr_msg.data;
 439         const size_t len = sizeof(struct hbm_host_stop_request);
 440
 441         mei_hbm_hdr(mei_hdr, len);
 442
 443         memset(req, 0, len);
 444         req->hbm_cmd = HOST_STOP_REQ_CMD;
 445         req->reason = DRIVER_STOP_REQUEST;
 446
 447         return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
 448 }
 449
 450 /**
 451  * mei_hbm_cl_flow_control_req - sends flow control request.
 452  *
 453  * @dev: the device structure
 454  * @cl: client info
 455  *
 456  * Return: -EIO on write failure
 457  */
 458 int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
 459 {
 460         const size_t len = sizeof(struct hbm_flow_control);
 461
 462         cl_dbg(dev, cl, "sending flow control\n");
 463         return mei_hbm_cl_write(dev, cl, MEI_FLOW_CONTROL_CMD, len);
 464 }
 465
 466 /**
 467  * mei_hbm_add_single_flow_creds - adds single buffer credentials.
 468  *
 469  * @dev: the device structure
 470  * @flow: flow control.
 471  *
 472  * Return: 0 on success, < 0 otherwise
 473  */
 474 static int mei_hbm_add_single_flow_creds(struct mei_device *dev,
 475                                   struct hbm_flow_control *flow)
 476 {
 477         struct mei_me_client *me_cl;
 478         int rets;
 479
 480         me_cl = mei_me_cl_by_id(dev, flow->me_addr);
 481         if (!me_cl) {
 482                 dev_err(dev->dev, "no such me client %d\n",
 483                         flow->me_addr);
 484                 return -ENOENT;
 485         }
 486
 487         if (WARN_ON(me_cl->props.single_recv_buf == 0)) {
 488                 rets = -EINVAL;
 489                 goto out;
 490         }
 491
 492         me_cl->mei_flow_ctrl_creds++;
 493         dev_dbg(dev->dev, "recv flow ctrl msg ME %d (single) creds = %d.\n",
 494             flow->me_addr, me_cl->mei_flow_ctrl_creds);
 495
 496         rets = 0;
 497 out:
 498         mei_me_cl_put(me_cl);
 499         return rets;
 500 }
 501
 502 /**
 503  * mei_hbm_cl_flow_control_res - flow control response from me
 504  *
 505  * @dev: the device structure
 506  * @flow_control: flow control response bus message
 507  */
 508 static void mei_hbm_cl_flow_control_res(struct mei_device *dev,
 509                                         struct hbm_flow_control *flow_control)
 510 {
 511         struct mei_cl *cl;
 512
 513         if (!flow_control->host_addr) {
 514                 /* single receive buffer */
 515                 mei_hbm_add_single_flow_creds(dev, flow_control);
 516                 return;
 517         }
 518
 519         cl = mei_hbm_cl_find_by_cmd(dev, flow_control);
 520         if (cl) {
 521                 cl->mei_flow_ctrl_creds++;
 522                 cl_dbg(dev, cl, "flow control creds = %d.\n",
 523                                 cl->mei_flow_ctrl_creds);
 524         }
 525 }
 526
 527
 528 /**
 529  * mei_hbm_cl_disconnect_req - sends disconnect message to fw.
 530  *
 531  * @dev: the device structure
 532  * @cl: a client to disconnect from
 533  *
 534  * Return: -EIO on write failure
 535  */
 536 int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
 537 {
 538         const size_t len = sizeof(struct hbm_client_connect_request);
 539
 540         return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_REQ_CMD, len);
 541 }
 542
 543 /**
 544  * mei_hbm_cl_disconnect_rsp - sends disconnect respose to the FW
 545  *
 546  * @dev: the device structure
 547  * @cl: a client to disconnect from
 548  *
 549  * Return: -EIO on write failure
 550  */
 551 int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
 552 {
 553         const size_t len = sizeof(struct hbm_client_connect_response);
 554
 555         return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_RES_CMD, len);
 556 }
 557
 558 /**
 559  * mei_hbm_cl_disconnect_res - update the client state according
 560  *       disconnect response
 561  *
 562  * @dev: the device structure
 563  * @cl: mei host client
 564  * @cmd: disconnect client response host bus message
 565  */
 566 static void mei_hbm_cl_disconnect_res(struct mei_device *dev, struct mei_cl *cl,
 567                                       struct mei_hbm_cl_cmd *cmd)
 568 {
 569         struct hbm_client_connect_response *rs =
 570                 (struct hbm_client_connect_response *)cmd;
 571
 572         cl_dbg(dev, cl, "hbm: disconnect response status=%d\n", rs->status);
 573
 574         if (rs->status == MEI_CL_DISCONN_SUCCESS)
 575                 cl->state = MEI_FILE_DISCONNECTED;
 576         cl->status = 0;
 577 }
 578
 579 /**
 580  * mei_hbm_cl_connect_req - send connection request to specific me client
 581  *
 582  * @dev: the device structure
 583  * @cl: a client to connect to
 584  *
 585  * Return: -EIO on write failure
 586  */
 587 int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
 588 {
 589         const size_t len = sizeof(struct hbm_client_connect_request);
 590
 591         return mei_hbm_cl_write(dev, cl, CLIENT_CONNECT_REQ_CMD, len);
 592 }
 593
 594 /**
 595  * mei_hbm_cl_connect_res - update the client state according
 596  *        connection response
 597  *
 598  * @dev: the device structure
 599  * @cl: mei host client
 600  * @cmd: connect client response host bus message
 601  */
 602 static void mei_hbm_cl_connect_res(struct mei_device *dev, struct mei_cl *cl,
 603                                    struct mei_hbm_cl_cmd *cmd)
 604 {
 605         struct hbm_client_connect_response *rs =
 606                 (struct hbm_client_connect_response *)cmd;
 607
 608         cl_dbg(dev, cl, "hbm: connect response status=%s\n",
 609                         mei_cl_conn_status_str(rs->status));
 610
 611         if (rs->status == MEI_CL_CONN_SUCCESS)
 612                 cl->state = MEI_FILE_CONNECTED;
 613         else
 614                 cl->state = MEI_FILE_DISCONNECTED;
 615         cl->status = mei_cl_conn_status_to_errno(rs->status);
 616 }
 617
 618 /**
 619  * mei_hbm_cl_res - process hbm response received on behalf
 620  *         an client
 621  *
 622  * @dev: the device structure
 623  * @rs:  hbm client message
 624  * @fop_type: file operation type
 625  */
 626 static void mei_hbm_cl_res(struct mei_device *dev,
 627                            struct mei_hbm_cl_cmd *rs,
 628                            enum mei_cb_file_ops fop_type)
 629 {
 630         struct mei_cl *cl;
 631         struct mei_cl_cb *cb, *next;
 632
 633         cl = NULL;
 634         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list.list, list) {
 635
 636                 cl = cb->cl;
 637
 638                 if (cb->fop_type != fop_type)
 639                         continue;
 640
 641                 if (mei_hbm_cl_addr_equal(cl, rs)) {
 642                         list_del_init(&cb->list);
 643                         break;
 644                 }
 645         }
 646
 647         if (!cl)
 648                 return;
 649
 650         switch (fop_type) {
 651         case MEI_FOP_CONNECT:
 652                 mei_hbm_cl_connect_res(dev, cl, rs);
 653                 break;
 654         case MEI_FOP_DISCONNECT:
 655                 mei_hbm_cl_disconnect_res(dev, cl, rs);
 656                 break;
 657         default:
 658                 return;
 659         }
 660
 661         cl->timer_count = 0;
 662         wake_up(&cl->wait);
 663 }
 664
 665
 666 /**
 667  * mei_hbm_fw_disconnect_req - disconnect request initiated by ME firmware
 668  *  host sends disconnect response
 669  *
 670  * @dev: the device structure.
 671  * @disconnect_req: disconnect request bus message from the me
 672  *
 673  * Return: -ENOMEM on allocation failure
 674  */
 675 static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
 676                 struct hbm_client_connect_request *disconnect_req)
 677 {
 678         struct mei_cl *cl;
 679         struct mei_cl_cb *cb;
 680
 681         cl = mei_hbm_cl_find_by_cmd(dev, disconnect_req);
 682         if (cl) {
 683                 cl_dbg(dev, cl, "disconnect request received\n");
 684                 cl->state = MEI_FILE_DISCONNECTED;
 685                 cl->timer_count = 0;
 686
 687                 cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT_RSP, NULL);
 688                 if (!cb)
 689                         return -ENOMEM;
 690                 cl_dbg(dev, cl, "add disconnect response as first\n");
 691                 list_add(&cb->list, &dev->ctrl_wr_list.list);
 692         }
 693         return 0;
 694 }
 695
 696 /**
 697  * mei_hbm_config_features - check what hbm features and commands
 698  *        are supported by the fw
 699  *
 700  * @dev: the device structure
 701  */
 702 static void mei_hbm_config_features(struct mei_device *dev)
 703 {
 704         /* Power Gating Isolation Support */
 705         dev->hbm_f_pg_supported = 0;
 706         if (dev->version.major_version > HBM_MAJOR_VERSION_PGI)
 707                 dev->hbm_f_pg_supported = 1;
 708
 709         if (dev->version.major_version == HBM_MAJOR_VERSION_PGI &&
 710             dev->version.minor_version >= HBM_MINOR_VERSION_PGI)
 711                 dev->hbm_f_pg_supported = 1;
 712 }
 713
 714 /**
 715  * mei_hbm_version_is_supported - checks whether the driver can
 716  *     support the hbm version of the device
 717  *
 718  * @dev: the device structure
 719  * Return: true if driver can support hbm version of the device
 720  */
 721 bool mei_hbm_version_is_supported(struct mei_device *dev)
 722 {
 723         return  (dev->version.major_version < HBM_MAJOR_VERSION) ||
 724                 (dev->version.major_version == HBM_MAJOR_VERSION &&
 725                  dev->version.minor_version <= HBM_MINOR_VERSION);
 726 }
 727
 728 /**
 729  * mei_hbm_dispatch - bottom half read routine after ISR to
 730  * handle the read bus message cmd processing.
 731  *
 732  * @dev: the device structure
 733  * @hdr: header of bus message
 734  *
 735  * Return: 0 on success and < 0 on failure
 736  */
 737 int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
 738 {
 739         struct mei_bus_message *mei_msg;
 740         struct hbm_host_version_response *version_res;
 741         struct hbm_props_response *props_res;
 742         struct hbm_host_enum_response *enum_res;
 743
 744         struct mei_hbm_cl_cmd *cl_cmd;
 745         struct hbm_client_connect_request *disconnect_req;
 746         struct hbm_flow_control *flow_control;
 747
 748         /* read the message to our buffer */
 749         BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
 750         mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
 751         mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
 752         cl_cmd  = (struct mei_hbm_cl_cmd *)mei_msg;
 753
 754         /* ignore spurious message and prevent reset nesting
 755          * hbm is put to idle during system reset
 756          */
 757         if (dev->hbm_state == MEI_HBM_IDLE) {
 758                 dev_dbg(dev->dev, "hbm: state is idle ignore spurious messages\n");
 759                 return 0;
 760         }
 761
 762         switch (mei_msg->hbm_cmd) {
 763         case HOST_START_RES_CMD:
 764                 dev_dbg(dev->dev, "hbm: start: response message received.\n");
 765
 766                 dev->init_clients_timer = 0;
 767
 768                 version_res = (struct hbm_host_version_response *)mei_msg;
 769
 770                 dev_dbg(dev->dev, "HBM VERSION: DRIVER=%02d:%02d DEVICE=%02d:%02d\n",
 771                                 HBM_MAJOR_VERSION, HBM_MINOR_VERSION,
 772                                 version_res->me_max_version.major_version,
 773                                 version_res->me_max_version.minor_version);
 774
 775                 if (version_res->host_version_supported) {
 776                         dev->version.major_version = HBM_MAJOR_VERSION;
 777                         dev->version.minor_version = HBM_MINOR_VERSION;
 778                 } else {
 779                         dev->version.major_version =
 780                                 version_res->me_max_version.major_version;
 781                         dev->version.minor_version =
 782                                 version_res->me_max_version.minor_version;
 783                 }
 784
 785                 if (!mei_hbm_version_is_supported(dev)) {
 786                         dev_warn(dev->dev, "hbm: start: version mismatch - stopping the driver.\n");
 787
 788                         dev->hbm_state = MEI_HBM_STOPPED;
 789                         if (mei_hbm_stop_req(dev)) {
 790                                 dev_err(dev->dev, "hbm: start: failed to send stop request\n");
 791                                 return -EIO;
 792                         }
 793                         break;
 794                 }
 795
 796                 mei_hbm_config_features(dev);
 797
 798                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 799                     dev->hbm_state != MEI_HBM_STARTING) {
 800                         dev_err(dev->dev, "hbm: start: state mismatch, [%d, %d]\n",
 801                                 dev->dev_state, dev->hbm_state);
 802                         return -EPROTO;
 803                 }
 804
 805                 if (mei_hbm_enum_clients_req(dev)) {
 806                         dev_err(dev->dev, "hbm: start: failed to send enumeration request\n");
 807                         return -EIO;
 808                 }
 809
 810                 wake_up(&dev->wait_hbm_start);
 811                 break;
 812
 813         case CLIENT_CONNECT_RES_CMD:
 814                 dev_dbg(dev->dev, "hbm: client connect response: message received.\n");
 815                 mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_CONNECT);
 816                 break;
 817
 818         case CLIENT_DISCONNECT_RES_CMD:
 819                 dev_dbg(dev->dev, "hbm: client disconnect response: message received.\n");
 820                 mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_DISCONNECT);
 821                 break;
 822
 823         case MEI_FLOW_CONTROL_CMD:
 824                 dev_dbg(dev->dev, "hbm: client flow control response: message received.\n");
 825
 826                 flow_control = (struct hbm_flow_control *) mei_msg;
 827                 mei_hbm_cl_flow_control_res(dev, flow_control);
 828                 break;
 829
 830         case MEI_PG_ISOLATION_ENTRY_RES_CMD:
 831                 dev_dbg(dev->dev, "power gate isolation entry response received\n");
 832                 dev->pg_event = MEI_PG_EVENT_RECEIVED;
 833                 if (waitqueue_active(&dev->wait_pg))
 834                         wake_up(&dev->wait_pg);
 835                 break;
 836
 837         case MEI_PG_ISOLATION_EXIT_REQ_CMD:
 838                 dev_dbg(dev->dev, "power gate isolation exit request received\n");
 839                 dev->pg_event = MEI_PG_EVENT_RECEIVED;
 840                 if (waitqueue_active(&dev->wait_pg))
 841                         wake_up(&dev->wait_pg);
 842                 else
 843                         /*
 844                         * If the driver is not waiting on this then
 845                         * this is HW initiated exit from PG.
 846                         * Start runtime pm resume sequence to exit from PG.
 847                         */
 848                         pm_request_resume(dev->dev);
 849                 break;
 850
 851         case HOST_CLIENT_PROPERTIES_RES_CMD:
 852                 dev_dbg(dev->dev, "hbm: properties response: message received.\n");
 853
 854                 dev->init_clients_timer = 0;
 855
 856                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 857                     dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
 858                         dev_err(dev->dev, "hbm: properties response: state mismatch, [%d, %d]\n",
 859                                 dev->dev_state, dev->hbm_state);
 860                         return -EPROTO;
 861                 }
 862
 863                 props_res = (struct hbm_props_response *)mei_msg;
 864
 865                 if (props_res->status) {
 866                         dev_err(dev->dev, "hbm: properties response: wrong status = %d %s\n",
 867                                 props_res->status,
 868                                 mei_hbm_status_str(props_res->status));
 869                         return -EPROTO;
 870                 }
 871
 872                 mei_hbm_me_cl_add(dev, props_res);
 873
 874                 dev->me_client_index++;
 875
 876                 /* request property for the next client */
 877                 if (mei_hbm_prop_req(dev))
 878                         return -EIO;
 879
 880                 break;
 881
 882         case HOST_ENUM_RES_CMD:
 883                 dev_dbg(dev->dev, "hbm: enumeration response: message received\n");
 884
 885                 dev->init_clients_timer = 0;
 886
 887                 enum_res = (struct hbm_host_enum_response *) mei_msg;
 888                 BUILD_BUG_ON(sizeof(dev->me_clients_map)
 889                                 < sizeof(enum_res->valid_addresses));
 890                 memcpy(dev->me_clients_map, enum_res->valid_addresses,
 891                                 sizeof(enum_res->valid_addresses));
 892
 893                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 894                     dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
 895                         dev_err(dev->dev, "hbm: enumeration response: state mismatch, [%d, %d]\n",
 896                                 dev->dev_state, dev->hbm_state);
 897                         return -EPROTO;
 898                 }
 899
 900                 dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
 901
 902                 /* first property request */
 903                 if (mei_hbm_prop_req(dev))
 904                         return -EIO;
 905
 906                 break;
 907
 908         case HOST_STOP_RES_CMD:
 909                 dev_dbg(dev->dev, "hbm: stop response: message received\n");
 910
 911                 dev->init_clients_timer = 0;
 912
 913                 if (dev->hbm_state != MEI_HBM_STOPPED) {
 914                         dev_err(dev->dev, "hbm: stop response: state mismatch, [%d, %d]\n",
 915                                 dev->dev_state, dev->hbm_state);
 916                         return -EPROTO;
 917                 }
 918
 919                 dev->dev_state = MEI_DEV_POWER_DOWN;
 920                 dev_info(dev->dev, "hbm: stop response: resetting.\n");
 921                 /* force the reset */
 922                 return -EPROTO;
 923                 break;
 924
 925         case CLIENT_DISCONNECT_REQ_CMD:
 926                 dev_dbg(dev->dev, "hbm: disconnect request: message received\n");
 927
 928                 disconnect_req = (struct hbm_client_connect_request *)mei_msg;
 929                 mei_hbm_fw_disconnect_req(dev, disconnect_req);
 930                 break;
 931
 932         case ME_STOP_REQ_CMD:
 933                 dev_dbg(dev->dev, "hbm: stop request: message received\n");
 934                 dev->hbm_state = MEI_HBM_STOPPED;
 935                 if (mei_hbm_stop_req(dev)) {
 936                         dev_err(dev->dev, "hbm: stop request: failed to send stop request\n");
 937                         return -EIO;
 938                 }
 939                 break;
 940         default:
 941                 BUG();
 942                 break;
 943
 944         }
 945         return 0;
 946 }
 947