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