drivers/misc/mei/hbm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2003-2022, Intel Corporation. All rights reserved.
   4  * Intel Management Engine Interface (Intel MEI) Linux driver
   5  */
   6 #include <linux/export.h>
   7 #include <linux/sched.h>
   8 #include <linux/wait.h>
   9 #include <linux/pm_runtime.h>
  10 #include <linux/slab.h>
  11
  12 #include <linux/mei.h>
  13
  14 #include "mei_dev.h"
  15 #include "hbm.h"
  16 #include "client.h"
  17
  18 static const char *mei_hbm_status_str(enum mei_hbm_status status)
  19 {
  20 #define MEI_HBM_STATUS(status) case MEI_HBMS_##status: return #status
  21         switch (status) {
  22         MEI_HBM_STATUS(SUCCESS);
  23         MEI_HBM_STATUS(CLIENT_NOT_FOUND);
  24         MEI_HBM_STATUS(ALREADY_EXISTS);
  25         MEI_HBM_STATUS(REJECTED);
  26         MEI_HBM_STATUS(INVALID_PARAMETER);
  27         MEI_HBM_STATUS(NOT_ALLOWED);
  28         MEI_HBM_STATUS(ALREADY_STARTED);
  29         MEI_HBM_STATUS(NOT_STARTED);
  30         default: return "unknown";
  31         }
  32 #undef MEI_HBM_STATUS
  33 };
  34
  35 static const char *mei_cl_conn_status_str(enum mei_cl_connect_status status)
  36 {
  37 #define MEI_CL_CS(status) case MEI_CL_CONN_##status: return #status
  38         switch (status) {
  39         MEI_CL_CS(SUCCESS);
  40         MEI_CL_CS(NOT_FOUND);
  41         MEI_CL_CS(ALREADY_STARTED);
  42         MEI_CL_CS(OUT_OF_RESOURCES);
  43         MEI_CL_CS(MESSAGE_SMALL);
  44         MEI_CL_CS(NOT_ALLOWED);
  45         default: return "unknown";
  46         }
  47 #undef MEI_CL_CCS
  48 }
  49
  50 const char *mei_hbm_state_str(enum mei_hbm_state state)
  51 {
  52 #define MEI_HBM_STATE(state) case MEI_HBM_##state: return #state
  53         switch (state) {
  54         MEI_HBM_STATE(IDLE);
  55         MEI_HBM_STATE(STARTING);
  56         MEI_HBM_STATE(STARTED);
  57         MEI_HBM_STATE(DR_SETUP);
  58         MEI_HBM_STATE(ENUM_CLIENTS);
  59         MEI_HBM_STATE(CLIENT_PROPERTIES);
  60         MEI_HBM_STATE(STOPPED);
  61         default:
  62                 return "unknown";
  63         }
  64 #undef MEI_HBM_STATE
  65 }
  66
  67 /**
  68  * mei_cl_conn_status_to_errno - convert client connect response
  69  * status to error code
  70  *
  71  * @status: client connect response status
  72  *
  73  * Return: corresponding error code
  74  */
  75 static int mei_cl_conn_status_to_errno(enum mei_cl_connect_status status)
  76 {
  77         switch (status) {
  78         case MEI_CL_CONN_SUCCESS:          return 0;
  79         case MEI_CL_CONN_NOT_FOUND:        return -ENOTTY;
  80         case MEI_CL_CONN_ALREADY_STARTED:  return -EBUSY;
  81         case MEI_CL_CONN_OUT_OF_RESOURCES: return -EBUSY;
  82         case MEI_CL_CONN_MESSAGE_SMALL:    return -EINVAL;
  83         case MEI_CL_CONN_NOT_ALLOWED:      return -EBUSY;
  84         default:                           return -EINVAL;
  85         }
  86 }
  87
  88 /**
  89  * mei_hbm_write_message - wrapper for sending hbm messages.
  90  *
  91  * @dev: mei device
  92  * @hdr: mei header
  93  * @data: payload
  94  *
  95  * Return: >=0 on success, <0 on error
  96  */
  97 static inline int mei_hbm_write_message(struct mei_device *dev,
  98                                         struct mei_msg_hdr *hdr,
  99                                         const void *data)
 100 {
 101         return mei_write_message(dev, hdr, sizeof(*hdr), data, hdr->length);
 102 }
 103
 104 /**
 105  * mei_hbm_idle - set hbm to idle state
 106  *
 107  * @dev: the device structure
 108  */
 109 void mei_hbm_idle(struct mei_device *dev)
 110 {
 111         dev->init_clients_timer = 0;
 112         dev->hbm_state = MEI_HBM_IDLE;
 113 }
 114
 115 /**
 116  * mei_hbm_reset - reset hbm counters and book keeping data structures
 117  *
 118  * @dev: the device structure
 119  */
 120 void mei_hbm_reset(struct mei_device *dev)
 121 {
 122         mei_me_cl_rm_all(dev);
 123
 124         mei_hbm_idle(dev);
 125 }
 126
 127 /**
 128  * mei_hbm_hdr - construct hbm header
 129  *
 130  * @mei_hdr: hbm header
 131  * @length: payload length
 132  */
 133
 134 static inline void mei_hbm_hdr(struct mei_msg_hdr *mei_hdr, size_t length)
 135 {
 136         memset(mei_hdr, 0, sizeof(*mei_hdr));
 137         mei_hdr->length = length;
 138         mei_hdr->msg_complete = 1;
 139 }
 140
 141 /**
 142  * mei_hbm_cl_hdr - construct client hbm header
 143  *
 144  * @cl: client
 145  * @hbm_cmd: host bus message command
 146  * @buf: buffer for cl header
 147  * @len: buffer length
 148  */
 149 static inline
 150 void mei_hbm_cl_hdr(struct mei_cl *cl, u8 hbm_cmd, void *buf, size_t len)
 151 {
 152         struct mei_hbm_cl_cmd *cmd = buf;
 153
 154         memset(cmd, 0, len);
 155
 156         cmd->hbm_cmd = hbm_cmd;
 157         cmd->host_addr = mei_cl_host_addr(cl);
 158         cmd->me_addr = mei_cl_me_id(cl);
 159 }
 160
 161 /**
 162  * mei_hbm_cl_write - write simple hbm client message
 163  *
 164  * @dev: the device structure
 165  * @cl: client
 166  * @hbm_cmd: host bus message command
 167  * @buf: message buffer
 168  * @len: buffer length
 169  *
 170  * Return: 0 on success, <0 on failure.
 171  */
 172 static inline int mei_hbm_cl_write(struct mei_device *dev, struct mei_cl *cl,
 173                                    u8 hbm_cmd, void *buf, size_t len)
 174 {
 175         struct mei_msg_hdr mei_hdr;
 176
 177         mei_hbm_hdr(&mei_hdr, len);
 178         mei_hbm_cl_hdr(cl, hbm_cmd, buf, len);
 179
 180         return mei_hbm_write_message(dev, &mei_hdr, buf);
 181 }
 182
 183 /**
 184  * mei_hbm_cl_addr_equal - check if the client's and
 185  *      the message address match
 186  *
 187  * @cl: client
 188  * @cmd: hbm client message
 189  *
 190  * Return: true if addresses are the same
 191  */
 192 static inline
 193 bool mei_hbm_cl_addr_equal(struct mei_cl *cl, struct mei_hbm_cl_cmd *cmd)
 194 {
 195         return  mei_cl_host_addr(cl) == cmd->host_addr &&
 196                 mei_cl_me_id(cl) == cmd->me_addr;
 197 }
 198
 199 /**
 200  * mei_hbm_cl_find_by_cmd - find recipient client
 201  *
 202  * @dev: the device structure
 203  * @buf: a buffer with hbm cl command
 204  *
 205  * Return: the recipient client or NULL if not found
 206  */
 207 static inline
 208 struct mei_cl *mei_hbm_cl_find_by_cmd(struct mei_device *dev, void *buf)
 209 {
 210         struct mei_hbm_cl_cmd *cmd = (struct mei_hbm_cl_cmd *)buf;
 211         struct mei_cl *cl;
 212
 213         list_for_each_entry(cl, &dev->file_list, link)
 214                 if (mei_hbm_cl_addr_equal(cl, cmd))
 215                         return cl;
 216         return NULL;
 217 }
 218
 219
 220 /**
 221  * mei_hbm_start_wait - wait for start response message.
 222  *
 223  * @dev: the device structure
 224  *
 225  * Return: 0 on success and < 0 on failure
 226  */
 227 int mei_hbm_start_wait(struct mei_device *dev)
 228 {
 229         int ret;
 230
 231         if (dev->hbm_state > MEI_HBM_STARTING)
 232                 return 0;
 233
 234         mutex_unlock(&dev->device_lock);
 235         ret = wait_event_timeout(dev->wait_hbm_start,
 236                         dev->hbm_state != MEI_HBM_STARTING,
 237                         dev->timeouts.hbm);
 238         mutex_lock(&dev->device_lock);
 239
 240         if (ret == 0 && (dev->hbm_state <= MEI_HBM_STARTING)) {
 241                 dev->hbm_state = MEI_HBM_IDLE;
 242                 dev_err(dev->dev, "waiting for mei start failed\n");
 243                 return -ETIME;
 244         }
 245         return 0;
 246 }
 247
 248 /**
 249  * mei_hbm_start_req - sends start request message.
 250  *
 251  * @dev: the device structure
 252  *
 253  * Return: 0 on success and < 0 on failure
 254  */
 255 int mei_hbm_start_req(struct mei_device *dev)
 256 {
 257         struct mei_msg_hdr mei_hdr;
 258         struct hbm_host_version_request req;
 259         int ret;
 260
 261         mei_hbm_reset(dev);
 262
 263         mei_hbm_hdr(&mei_hdr, sizeof(req));
 264
 265         /* host start message */
 266         memset(&req, 0, sizeof(req));
 267         req.hbm_cmd = HOST_START_REQ_CMD;
 268         req.host_version.major_version = HBM_MAJOR_VERSION;
 269         req.host_version.minor_version = HBM_MINOR_VERSION;
 270
 271         dev->hbm_state = MEI_HBM_IDLE;
 272         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 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 = dev->timeouts.client_init;
 281         mei_schedule_stall_timer(dev);
 282         return 0;
 283 }
 284
 285 /**
 286  * mei_hbm_dma_setup_req() - setup DMA request
 287  * @dev: the device structure
 288  *
 289  * Return: 0 on success and < 0 on failure
 290  */
 291 static int mei_hbm_dma_setup_req(struct mei_device *dev)
 292 {
 293         struct mei_msg_hdr mei_hdr;
 294         struct hbm_dma_setup_request req;
 295         unsigned int i;
 296         int ret;
 297
 298         mei_hbm_hdr(&mei_hdr, sizeof(req));
 299
 300         memset(&req, 0, sizeof(req));
 301         req.hbm_cmd = MEI_HBM_DMA_SETUP_REQ_CMD;
 302         for (i = 0; i < DMA_DSCR_NUM; i++) {
 303                 phys_addr_t paddr;
 304
 305                 paddr = dev->dr_dscr[i].daddr;
 306                 req.dma_dscr[i].addr_hi = upper_32_bits(paddr);
 307                 req.dma_dscr[i].addr_lo = lower_32_bits(paddr);
 308                 req.dma_dscr[i].size = dev->dr_dscr[i].size;
 309         }
 310
 311         mei_dma_ring_reset(dev);
 312
 313         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 314         if (ret) {
 315                 dev_err(dev->dev, "dma setup request write failed: ret = %d.\n",
 316                         ret);
 317                 return ret;
 318         }
 319
 320         dev->hbm_state = MEI_HBM_DR_SETUP;
 321         dev->init_clients_timer = dev->timeouts.client_init;
 322         mei_schedule_stall_timer(dev);
 323         return 0;
 324 }
 325
 326 /**
 327  * mei_hbm_capabilities_req - request capabilities
 328  *
 329  * @dev: the device structure
 330  *
 331  * Return: 0 on success and < 0 on failure
 332  */
 333 static int mei_hbm_capabilities_req(struct mei_device *dev)
 334 {
 335         struct mei_msg_hdr mei_hdr;
 336         struct hbm_capability_request req;
 337         int ret;
 338
 339         mei_hbm_hdr(&mei_hdr, sizeof(req));
 340
 341         memset(&req, 0, sizeof(req));
 342         req.hbm_cmd = MEI_HBM_CAPABILITIES_REQ_CMD;
 343         if (dev->hbm_f_vt_supported)
 344                 req.capability_requested[0] |= HBM_CAP_VT;
 345
 346         if (dev->hbm_f_cd_supported)
 347                 req.capability_requested[0] |= HBM_CAP_CD;
 348
 349         if (dev->hbm_f_gsc_supported)
 350                 req.capability_requested[0] |= HBM_CAP_GSC;
 351
 352         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 353         if (ret) {
 354                 dev_err(dev->dev,
 355                         "capabilities request write failed: ret = %d.\n", ret);
 356                 return ret;
 357         }
 358
 359         dev->hbm_state = MEI_HBM_CAP_SETUP;
 360         dev->init_clients_timer = dev->timeouts.client_init;
 361         mei_schedule_stall_timer(dev);
 362         return 0;
 363 }
 364
 365 /**
 366  * mei_hbm_enum_clients_req - sends enumeration client request message.
 367  *
 368  * @dev: the device structure
 369  *
 370  * Return: 0 on success and < 0 on failure
 371  */
 372 static int mei_hbm_enum_clients_req(struct mei_device *dev)
 373 {
 374         struct mei_msg_hdr mei_hdr;
 375         struct hbm_host_enum_request req;
 376         int ret;
 377
 378         /* enumerate clients */
 379         mei_hbm_hdr(&mei_hdr, sizeof(req));
 380
 381         memset(&req, 0, sizeof(req));
 382         req.hbm_cmd = HOST_ENUM_REQ_CMD;
 383         req.flags |= dev->hbm_f_dc_supported ? MEI_HBM_ENUM_F_ALLOW_ADD : 0;
 384         req.flags |= dev->hbm_f_ie_supported ?
 385                           MEI_HBM_ENUM_F_IMMEDIATE_ENUM : 0;
 386
 387         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 388         if (ret) {
 389                 dev_err(dev->dev, "enumeration request write failed: ret = %d.\n",
 390                         ret);
 391                 return ret;
 392         }
 393         dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
 394         dev->init_clients_timer = dev->timeouts.client_init;
 395         mei_schedule_stall_timer(dev);
 396         return 0;
 397 }
 398
 399 /**
 400  * mei_hbm_me_cl_add - add new me client to the list
 401  *
 402  * @dev: the device structure
 403  * @res: hbm property response
 404  *
 405  * Return: 0 on success and -ENOMEM on allocation failure
 406  */
 407
 408 static int mei_hbm_me_cl_add(struct mei_device *dev,
 409                              struct hbm_props_response *res)
 410 {
 411         struct mei_me_client *me_cl;
 412         const uuid_le *uuid = &res->client_properties.protocol_name;
 413
 414         mei_me_cl_rm_by_uuid(dev, uuid);
 415
 416         me_cl = kzalloc(sizeof(*me_cl), GFP_KERNEL);
 417         if (!me_cl)
 418                 return -ENOMEM;
 419
 420         mei_me_cl_init(me_cl);
 421
 422         me_cl->props = res->client_properties;
 423         me_cl->client_id = res->me_addr;
 424         me_cl->tx_flow_ctrl_creds = 0;
 425
 426         mei_me_cl_add(dev, me_cl);
 427
 428         return 0;
 429 }
 430
 431 /**
 432  * mei_hbm_add_cl_resp - send response to fw on client add request
 433  *
 434  * @dev: the device structure
 435  * @addr: me address
 436  * @status: response status
 437  *
 438  * Return: 0 on success and < 0 on failure
 439  */
 440 static int mei_hbm_add_cl_resp(struct mei_device *dev, u8 addr, u8 status)
 441 {
 442         struct mei_msg_hdr mei_hdr;
 443         struct hbm_add_client_response resp;
 444         int ret;
 445
 446         dev_dbg(dev->dev, "adding client response\n");
 447
 448         mei_hbm_hdr(&mei_hdr, sizeof(resp));
 449
 450         memset(&resp, 0, sizeof(resp));
 451         resp.hbm_cmd = MEI_HBM_ADD_CLIENT_RES_CMD;
 452         resp.me_addr = addr;
 453         resp.status  = status;
 454
 455         ret = mei_hbm_write_message(dev, &mei_hdr, &resp);
 456         if (ret)
 457                 dev_err(dev->dev, "add client response write failed: ret = %d\n",
 458                         ret);
 459         return ret;
 460 }
 461
 462 /**
 463  * mei_hbm_fw_add_cl_req - request from the fw to add a client
 464  *
 465  * @dev: the device structure
 466  * @req: add client request
 467  *
 468  * Return: 0 on success and < 0 on failure
 469  */
 470 static int mei_hbm_fw_add_cl_req(struct mei_device *dev,
 471                               struct hbm_add_client_request *req)
 472 {
 473         int ret;
 474         u8 status = MEI_HBMS_SUCCESS;
 475
 476         BUILD_BUG_ON(sizeof(struct hbm_add_client_request) !=
 477                         sizeof(struct hbm_props_response));
 478
 479         ret = mei_hbm_me_cl_add(dev, (struct hbm_props_response *)req);
 480         if (ret)
 481                 status = !MEI_HBMS_SUCCESS;
 482
 483         if (dev->dev_state == MEI_DEV_ENABLED)
 484                 schedule_work(&dev->bus_rescan_work);
 485
 486         return mei_hbm_add_cl_resp(dev, req->me_addr, status);
 487 }
 488
 489 /**
 490  * mei_hbm_cl_notify_req - send notification request
 491  *
 492  * @dev: the device structure
 493  * @cl: a client to disconnect from
 494  * @start: true for start false for stop
 495  *
 496  * Return: 0 on success and -EIO on write failure
 497  */
 498 int mei_hbm_cl_notify_req(struct mei_device *dev,
 499                           struct mei_cl *cl, u8 start)
 500 {
 501
 502         struct mei_msg_hdr mei_hdr;
 503         struct hbm_notification_request req;
 504         int ret;
 505
 506         mei_hbm_hdr(&mei_hdr, sizeof(req));
 507         mei_hbm_cl_hdr(cl, MEI_HBM_NOTIFY_REQ_CMD, &req, sizeof(req));
 508
 509         req.start = start;
 510
 511         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 512         if (ret)
 513                 dev_err(dev->dev, "notify request failed: ret = %d\n", ret);
 514
 515         return ret;
 516 }
 517
 518 /**
 519  *  notify_res_to_fop - convert notification response to the proper
 520  *      notification FOP
 521  *
 522  * @cmd: client notification start response command
 523  *
 524  * Return:  MEI_FOP_NOTIFY_START or MEI_FOP_NOTIFY_STOP;
 525  */
 526 static inline enum mei_cb_file_ops notify_res_to_fop(struct mei_hbm_cl_cmd *cmd)
 527 {
 528         struct hbm_notification_response *rs =
 529                 (struct hbm_notification_response *)cmd;
 530
 531         return mei_cl_notify_req2fop(rs->start);
 532 }
 533
 534 /**
 535  * mei_hbm_cl_notify_start_res - update the client state according
 536  *       notify start response
 537  *
 538  * @dev: the device structure
 539  * @cl: mei host client
 540  * @cmd: client notification start response command
 541  */
 542 static void mei_hbm_cl_notify_start_res(struct mei_device *dev,
 543                                         struct mei_cl *cl,
 544                                         struct mei_hbm_cl_cmd *cmd)
 545 {
 546         struct hbm_notification_response *rs =
 547                 (struct hbm_notification_response *)cmd;
 548
 549         cl_dbg(dev, cl, "hbm: notify start response status=%d\n", rs->status);
 550
 551         if (rs->status == MEI_HBMS_SUCCESS ||
 552             rs->status == MEI_HBMS_ALREADY_STARTED) {
 553                 cl->notify_en = true;
 554                 cl->status = 0;
 555         } else {
 556                 cl->status = -EINVAL;
 557         }
 558 }
 559
 560 /**
 561  * mei_hbm_cl_notify_stop_res - update the client state according
 562  *       notify stop response
 563  *
 564  * @dev: the device structure
 565  * @cl: mei host client
 566  * @cmd: client notification stop response command
 567  */
 568 static void mei_hbm_cl_notify_stop_res(struct mei_device *dev,
 569                                        struct mei_cl *cl,
 570                                        struct mei_hbm_cl_cmd *cmd)
 571 {
 572         struct hbm_notification_response *rs =
 573                 (struct hbm_notification_response *)cmd;
 574
 575         cl_dbg(dev, cl, "hbm: notify stop response status=%d\n", rs->status);
 576
 577         if (rs->status == MEI_HBMS_SUCCESS ||
 578             rs->status == MEI_HBMS_NOT_STARTED) {
 579                 cl->notify_en = false;
 580                 cl->status = 0;
 581         } else {
 582                 /* TODO: spec is not clear yet about other possible issues */
 583                 cl->status = -EINVAL;
 584         }
 585 }
 586
 587 /**
 588  * mei_hbm_cl_notify - signal notification event
 589  *
 590  * @dev: the device structure
 591  * @cmd: notification client message
 592  */
 593 static void mei_hbm_cl_notify(struct mei_device *dev,
 594                               struct mei_hbm_cl_cmd *cmd)
 595 {
 596         struct mei_cl *cl;
 597
 598         cl = mei_hbm_cl_find_by_cmd(dev, cmd);
 599         if (cl)
 600                 mei_cl_notify(cl);
 601 }
 602
 603 /**
 604  * mei_hbm_cl_dma_map_req - send client dma map request
 605  *
 606  * @dev: the device structure
 607  * @cl: mei host client
 608  *
 609  * Return: 0 on success and -EIO on write failure
 610  */
 611 int mei_hbm_cl_dma_map_req(struct mei_device *dev, struct mei_cl *cl)
 612 {
 613         struct mei_msg_hdr mei_hdr;
 614         struct hbm_client_dma_map_request req;
 615         int ret;
 616
 617         mei_hbm_hdr(&mei_hdr, sizeof(req));
 618
 619         memset(&req, 0, sizeof(req));
 620
 621         req.hbm_cmd = MEI_HBM_CLIENT_DMA_MAP_REQ_CMD;
 622         req.client_buffer_id = cl->dma.buffer_id;
 623         req.address_lsb = lower_32_bits(cl->dma.daddr);
 624         req.address_msb = upper_32_bits(cl->dma.daddr);
 625         req.size = cl->dma.size;
 626
 627         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 628         if (ret)
 629                 dev_err(dev->dev, "dma map request failed: ret = %d\n", ret);
 630
 631         return ret;
 632 }
 633
 634 /**
 635  * mei_hbm_cl_dma_unmap_req - send client dma unmap request
 636  *
 637  * @dev: the device structure
 638  * @cl: mei host client
 639  *
 640  * Return: 0 on success and -EIO on write failure
 641  */
 642 int mei_hbm_cl_dma_unmap_req(struct mei_device *dev, struct mei_cl *cl)
 643 {
 644         struct mei_msg_hdr mei_hdr;
 645         struct hbm_client_dma_unmap_request req;
 646         int ret;
 647
 648         mei_hbm_hdr(&mei_hdr, sizeof(req));
 649
 650         memset(&req, 0, sizeof(req));
 651
 652         req.hbm_cmd = MEI_HBM_CLIENT_DMA_UNMAP_REQ_CMD;
 653         req.client_buffer_id = cl->dma.buffer_id;
 654
 655         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 656         if (ret)
 657                 dev_err(dev->dev, "dma unmap request failed: ret = %d\n", ret);
 658
 659         return ret;
 660 }
 661
 662 static void mei_hbm_cl_dma_map_res(struct mei_device *dev,
 663                                    struct hbm_client_dma_response *res)
 664 {
 665         struct mei_cl *cl;
 666         struct mei_cl_cb *cb, *next;
 667
 668         cl = NULL;
 669         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
 670                 if (cb->fop_type != MEI_FOP_DMA_MAP)
 671                         continue;
 672                 if (!cb->cl->dma.buffer_id || cb->cl->dma_mapped)
 673                         continue;
 674
 675                 cl = cb->cl;
 676                 break;
 677         }
 678         if (!cl)
 679                 return;
 680
 681         if (res->status) {
 682                 dev_err(dev->dev, "cl dma map failed %d\n", res->status);
 683                 cl->status = -EFAULT;
 684         } else {
 685                 dev_dbg(dev->dev, "cl dma map succeeded\n");
 686                 cl->dma_mapped = 1;
 687                 cl->status = 0;
 688         }
 689         wake_up(&cl->wait);
 690 }
 691
 692 static void mei_hbm_cl_dma_unmap_res(struct mei_device *dev,
 693                                      struct hbm_client_dma_response *res)
 694 {
 695         struct mei_cl *cl;
 696         struct mei_cl_cb *cb, *next;
 697
 698         cl = NULL;
 699         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
 700                 if (cb->fop_type != MEI_FOP_DMA_UNMAP)
 701                         continue;
 702                 if (!cb->cl->dma.buffer_id || !cb->cl->dma_mapped)
 703                         continue;
 704
 705                 cl = cb->cl;
 706                 break;
 707         }
 708         if (!cl)
 709                 return;
 710
 711         if (res->status) {
 712                 dev_err(dev->dev, "cl dma unmap failed %d\n", res->status);
 713                 cl->status = -EFAULT;
 714         } else {
 715                 dev_dbg(dev->dev, "cl dma unmap succeeded\n");
 716                 cl->dma_mapped = 0;
 717                 cl->status = 0;
 718         }
 719         wake_up(&cl->wait);
 720 }
 721
 722 /**
 723  * mei_hbm_prop_req - request property for a single client
 724  *
 725  * @dev: the device structure
 726  * @start_idx: client index to start search
 727  *
 728  * Return: 0 on success and < 0 on failure
 729  */
 730 static int mei_hbm_prop_req(struct mei_device *dev, unsigned long start_idx)
 731 {
 732         struct mei_msg_hdr mei_hdr;
 733         struct hbm_props_request req;
 734         unsigned long addr;
 735         int ret;
 736
 737         addr = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, start_idx);
 738
 739         /* We got all client properties */
 740         if (addr == MEI_CLIENTS_MAX) {
 741                 dev->hbm_state = MEI_HBM_STARTED;
 742                 mei_host_client_init(dev);
 743                 return 0;
 744         }
 745
 746         mei_hbm_hdr(&mei_hdr, sizeof(req));
 747
 748         memset(&req, 0, sizeof(req));
 749
 750         req.hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
 751         req.me_addr = addr;
 752
 753         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 754         if (ret) {
 755                 dev_err(dev->dev, "properties request write failed: ret = %d\n",
 756                         ret);
 757                 return ret;
 758         }
 759
 760         dev->init_clients_timer = dev->timeouts.client_init;
 761         mei_schedule_stall_timer(dev);
 762
 763         return 0;
 764 }
 765
 766 /**
 767  * mei_hbm_pg - sends pg command
 768  *
 769  * @dev: the device structure
 770  * @pg_cmd: the pg command code
 771  *
 772  * Return: -EIO on write failure
 773  *         -EOPNOTSUPP if the operation is not supported by the protocol
 774  */
 775 int mei_hbm_pg(struct mei_device *dev, u8 pg_cmd)
 776 {
 777         struct mei_msg_hdr mei_hdr;
 778         struct hbm_power_gate req;
 779         int ret;
 780
 781         if (!dev->hbm_f_pg_supported)
 782                 return -EOPNOTSUPP;
 783
 784         mei_hbm_hdr(&mei_hdr, sizeof(req));
 785
 786         memset(&req, 0, sizeof(req));
 787         req.hbm_cmd = pg_cmd;
 788
 789         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 790         if (ret)
 791                 dev_err(dev->dev, "power gate command write failed.\n");
 792         return ret;
 793 }
 794 EXPORT_SYMBOL_GPL(mei_hbm_pg);
 795
 796 /**
 797  * mei_hbm_stop_req - send stop request message
 798  *
 799  * @dev: mei device
 800  *
 801  * Return: -EIO on write failure
 802  */
 803 static int mei_hbm_stop_req(struct mei_device *dev)
 804 {
 805         struct mei_msg_hdr mei_hdr;
 806         struct hbm_host_stop_request req;
 807
 808         mei_hbm_hdr(&mei_hdr, sizeof(req));
 809
 810         memset(&req, 0, sizeof(req));
 811         req.hbm_cmd = HOST_STOP_REQ_CMD;
 812         req.reason = DRIVER_STOP_REQUEST;
 813
 814         return mei_hbm_write_message(dev, &mei_hdr, &req);
 815 }
 816
 817 /**
 818  * mei_hbm_cl_flow_control_req - sends flow control request.
 819  *
 820  * @dev: the device structure
 821  * @cl: client info
 822  *
 823  * Return: -EIO on write failure
 824  */
 825 int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
 826 {
 827         struct hbm_flow_control req;
 828
 829         cl_dbg(dev, cl, "sending flow control\n");
 830         return mei_hbm_cl_write(dev, cl, MEI_FLOW_CONTROL_CMD,
 831                                 &req, sizeof(req));
 832 }
 833
 834 /**
 835  * mei_hbm_add_single_tx_flow_ctrl_creds - adds single buffer credentials.
 836  *
 837  * @dev: the device structure
 838  * @fctrl: flow control response bus message
 839  *
 840  * Return: 0 on success, < 0 otherwise
 841  */
 842 static int mei_hbm_add_single_tx_flow_ctrl_creds(struct mei_device *dev,
 843                                                  struct hbm_flow_control *fctrl)
 844 {
 845         struct mei_me_client *me_cl;
 846         int rets;
 847
 848         me_cl = mei_me_cl_by_id(dev, fctrl->me_addr);
 849         if (!me_cl) {
 850                 dev_err(dev->dev, "no such me client %d\n", fctrl->me_addr);
 851                 return -ENOENT;
 852         }
 853
 854         if (WARN_ON(me_cl->props.single_recv_buf == 0)) {
 855                 rets = -EINVAL;
 856                 goto out;
 857         }
 858
 859         me_cl->tx_flow_ctrl_creds++;
 860         dev_dbg(dev->dev, "recv flow ctrl msg ME %d (single) creds = %d.\n",
 861                 fctrl->me_addr, me_cl->tx_flow_ctrl_creds);
 862
 863         rets = 0;
 864 out:
 865         mei_me_cl_put(me_cl);
 866         return rets;
 867 }
 868
 869 /**
 870  * mei_hbm_cl_tx_flow_ctrl_creds_res - flow control response from me
 871  *
 872  * @dev: the device structure
 873  * @fctrl: flow control response bus message
 874  */
 875 static void mei_hbm_cl_tx_flow_ctrl_creds_res(struct mei_device *dev,
 876                                                struct hbm_flow_control *fctrl)
 877 {
 878         struct mei_cl *cl;
 879
 880         if (!fctrl->host_addr) {
 881                 /* single receive buffer */
 882                 mei_hbm_add_single_tx_flow_ctrl_creds(dev, fctrl);
 883                 return;
 884         }
 885
 886         cl = mei_hbm_cl_find_by_cmd(dev, fctrl);
 887         if (cl) {
 888                 cl->tx_flow_ctrl_creds++;
 889                 cl_dbg(dev, cl, "flow control creds = %d.\n",
 890                                 cl->tx_flow_ctrl_creds);
 891         }
 892 }
 893
 894
 895 /**
 896  * mei_hbm_cl_disconnect_req - sends disconnect message to fw.
 897  *
 898  * @dev: the device structure
 899  * @cl: a client to disconnect from
 900  *
 901  * Return: -EIO on write failure
 902  */
 903 int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
 904 {
 905         struct hbm_client_connect_request req;
 906
 907         return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_REQ_CMD,
 908                                 &req, sizeof(req));
 909 }
 910
 911 /**
 912  * mei_hbm_cl_disconnect_rsp - sends disconnect response to the FW
 913  *
 914  * @dev: the device structure
 915  * @cl: a client to disconnect from
 916  *
 917  * Return: -EIO on write failure
 918  */
 919 int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
 920 {
 921         struct hbm_client_connect_response resp;
 922
 923         return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_RES_CMD,
 924                                 &resp, sizeof(resp));
 925 }
 926
 927 /**
 928  * mei_hbm_cl_disconnect_res - update the client state according
 929  *       disconnect response
 930  *
 931  * @dev: the device structure
 932  * @cl: mei host client
 933  * @cmd: disconnect client response host bus message
 934  */
 935 static void mei_hbm_cl_disconnect_res(struct mei_device *dev, struct mei_cl *cl,
 936                                       struct mei_hbm_cl_cmd *cmd)
 937 {
 938         struct hbm_client_connect_response *rs =
 939                 (struct hbm_client_connect_response *)cmd;
 940
 941         cl_dbg(dev, cl, "hbm: disconnect response status=%d\n", rs->status);
 942
 943         if (rs->status == MEI_CL_DISCONN_SUCCESS)
 944                 cl->state = MEI_FILE_DISCONNECT_REPLY;
 945         cl->status = 0;
 946 }
 947
 948 /**
 949  * mei_hbm_cl_connect_req - send connection request to specific me client
 950  *
 951  * @dev: the device structure
 952  * @cl: a client to connect to
 953  *
 954  * Return: -EIO on write failure
 955  */
 956 int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
 957 {
 958         struct hbm_client_connect_request req;
 959
 960         return mei_hbm_cl_write(dev, cl, CLIENT_CONNECT_REQ_CMD,
 961                                 &req, sizeof(req));
 962 }
 963
 964 /**
 965  * mei_hbm_cl_connect_res - update the client state according
 966  *        connection response
 967  *
 968  * @dev: the device structure
 969  * @cl: mei host client
 970  * @cmd: connect client response host bus message
 971  */
 972 static void mei_hbm_cl_connect_res(struct mei_device *dev, struct mei_cl *cl,
 973                                    struct mei_hbm_cl_cmd *cmd)
 974 {
 975         struct hbm_client_connect_response *rs =
 976                 (struct hbm_client_connect_response *)cmd;
 977
 978         cl_dbg(dev, cl, "hbm: connect response status=%s\n",
 979                         mei_cl_conn_status_str(rs->status));
 980
 981         if (rs->status == MEI_CL_CONN_SUCCESS)
 982                 cl->state = MEI_FILE_CONNECTED;
 983         else {
 984                 cl->state = MEI_FILE_DISCONNECT_REPLY;
 985                 if (rs->status == MEI_CL_CONN_NOT_FOUND) {
 986                         mei_me_cl_del(dev, cl->me_cl);
 987                         if (dev->dev_state == MEI_DEV_ENABLED)
 988                                 schedule_work(&dev->bus_rescan_work);
 989                 }
 990         }
 991         cl->status = mei_cl_conn_status_to_errno(rs->status);
 992 }
 993
 994 /**
 995  * mei_hbm_cl_res - process hbm response received on behalf
 996  *         an client
 997  *
 998  * @dev: the device structure
 999  * @rs:  hbm client message
1000  * @fop_type: file operation type
1001  */
1002 static void mei_hbm_cl_res(struct mei_device *dev,
1003                            struct mei_hbm_cl_cmd *rs,
1004                            enum mei_cb_file_ops fop_type)
1005 {
1006         struct mei_cl *cl;
1007         struct mei_cl_cb *cb, *next;
1008
1009         cl = NULL;
1010         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
1011
1012                 cl = cb->cl;
1013
1014                 if (cb->fop_type != fop_type)
1015                         continue;
1016
1017                 if (mei_hbm_cl_addr_equal(cl, rs)) {
1018                         list_del_init(&cb->list);
1019                         break;
1020                 }
1021         }
1022
1023         if (!cl)
1024                 return;
1025
1026         switch (fop_type) {
1027         case MEI_FOP_CONNECT:
1028                 mei_hbm_cl_connect_res(dev, cl, rs);
1029                 break;
1030         case MEI_FOP_DISCONNECT:
1031                 mei_hbm_cl_disconnect_res(dev, cl, rs);
1032                 break;
1033         case MEI_FOP_NOTIFY_START:
1034                 mei_hbm_cl_notify_start_res(dev, cl, rs);
1035                 break;
1036         case MEI_FOP_NOTIFY_STOP:
1037                 mei_hbm_cl_notify_stop_res(dev, cl, rs);
1038                 break;
1039         default:
1040                 return;
1041         }
1042
1043         cl->timer_count = 0;
1044         wake_up(&cl->wait);
1045 }
1046
1047
1048 /**
1049  * mei_hbm_fw_disconnect_req - disconnect request initiated by ME firmware
1050  *  host sends disconnect response
1051  *
1052  * @dev: the device structure.
1053  * @disconnect_req: disconnect request bus message from the me
1054  *
1055  * Return: -ENOMEM on allocation failure
1056  */
1057 static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
1058                 struct hbm_client_connect_request *disconnect_req)
1059 {
1060         struct mei_cl *cl;
1061         struct mei_cl_cb *cb;
1062
1063         cl = mei_hbm_cl_find_by_cmd(dev, disconnect_req);
1064         if (cl) {
1065                 cl_warn(dev, cl, "fw disconnect request received\n");
1066                 cl->state = MEI_FILE_DISCONNECTING;
1067                 cl->timer_count = 0;
1068
1069                 cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DISCONNECT_RSP,
1070                                                NULL);
1071                 if (!cb)
1072                         return -ENOMEM;
1073         }
1074         return 0;
1075 }
1076
1077 /**
1078  * mei_hbm_pg_enter_res - PG enter response received
1079  *
1080  * @dev: the device structure.
1081  *
1082  * Return: 0 on success, -EPROTO on state mismatch
1083  */
1084 static int mei_hbm_pg_enter_res(struct mei_device *dev)
1085 {
1086         if (mei_pg_state(dev) != MEI_PG_OFF ||
1087             dev->pg_event != MEI_PG_EVENT_WAIT) {
1088                 dev_err(dev->dev, "hbm: pg entry response: state mismatch [%s, %d]\n",
1089                         mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
1090                 return -EPROTO;
1091         }
1092
1093         dev->pg_event = MEI_PG_EVENT_RECEIVED;
1094         wake_up(&dev->wait_pg);
1095
1096         return 0;
1097 }
1098
1099 /**
1100  * mei_hbm_pg_resume - process with PG resume
1101  *
1102  * @dev: the device structure.
1103  */
1104 void mei_hbm_pg_resume(struct mei_device *dev)
1105 {
1106         pm_request_resume(dev->dev);
1107 }
1108 EXPORT_SYMBOL_GPL(mei_hbm_pg_resume);
1109
1110 /**
1111  * mei_hbm_pg_exit_res - PG exit response received
1112  *
1113  * @dev: the device structure.
1114  *
1115  * Return: 0 on success, -EPROTO on state mismatch
1116  */
1117 static int mei_hbm_pg_exit_res(struct mei_device *dev)
1118 {
1119         if (mei_pg_state(dev) != MEI_PG_ON ||
1120             (dev->pg_event != MEI_PG_EVENT_WAIT &&
1121              dev->pg_event != MEI_PG_EVENT_IDLE)) {
1122                 dev_err(dev->dev, "hbm: pg exit response: state mismatch [%s, %d]\n",
1123                         mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
1124                 return -EPROTO;
1125         }
1126
1127         switch (dev->pg_event) {
1128         case MEI_PG_EVENT_WAIT:
1129                 dev->pg_event = MEI_PG_EVENT_RECEIVED;
1130                 wake_up(&dev->wait_pg);
1131                 break;
1132         case MEI_PG_EVENT_IDLE:
1133                 /*
1134                 * If the driver is not waiting on this then
1135                 * this is HW initiated exit from PG.
1136                 * Start runtime pm resume sequence to exit from PG.
1137                 */
1138                 dev->pg_event = MEI_PG_EVENT_RECEIVED;
1139                 mei_hbm_pg_resume(dev);
1140                 break;
1141         default:
1142                 WARN(1, "hbm: pg exit response: unexpected pg event = %d\n",
1143                      dev->pg_event);
1144                 return -EPROTO;
1145         }
1146
1147         return 0;
1148 }
1149
1150 /**
1151  * mei_hbm_config_features - check what hbm features and commands
1152  *        are supported by the fw
1153  *
1154  * @dev: the device structure
1155  */
1156 static void mei_hbm_config_features(struct mei_device *dev)
1157 {
1158         /* Power Gating Isolation Support */
1159         dev->hbm_f_pg_supported = 0;
1160         if (dev->version.major_version > HBM_MAJOR_VERSION_PGI)
1161                 dev->hbm_f_pg_supported = 1;
1162
1163         if (dev->version.major_version == HBM_MAJOR_VERSION_PGI &&
1164             dev->version.minor_version >= HBM_MINOR_VERSION_PGI)
1165                 dev->hbm_f_pg_supported = 1;
1166
1167         dev->hbm_f_dc_supported = 0;
1168         if (dev->version.major_version >= HBM_MAJOR_VERSION_DC)
1169                 dev->hbm_f_dc_supported = 1;
1170
1171         dev->hbm_f_ie_supported = 0;
1172         if (dev->version.major_version >= HBM_MAJOR_VERSION_IE)
1173                 dev->hbm_f_ie_supported = 1;
1174
1175         /* disconnect on connect timeout instead of link reset */
1176         dev->hbm_f_dot_supported = 0;
1177         if (dev->version.major_version >= HBM_MAJOR_VERSION_DOT)
1178                 dev->hbm_f_dot_supported = 1;
1179
1180         /* Notification Event Support */
1181         dev->hbm_f_ev_supported = 0;
1182         if (dev->version.major_version >= HBM_MAJOR_VERSION_EV)
1183                 dev->hbm_f_ev_supported = 1;
1184
1185         /* Fixed Address Client Support */
1186         dev->hbm_f_fa_supported = 0;
1187         if (dev->version.major_version >= HBM_MAJOR_VERSION_FA)
1188                 dev->hbm_f_fa_supported = 1;
1189
1190         /* OS ver message Support */
1191         dev->hbm_f_os_supported = 0;
1192         if (dev->version.major_version >= HBM_MAJOR_VERSION_OS)
1193                 dev->hbm_f_os_supported = 1;
1194
1195         /* DMA Ring Support */
1196         dev->hbm_f_dr_supported = 0;
1197         if (dev->version.major_version > HBM_MAJOR_VERSION_DR ||
1198             (dev->version.major_version == HBM_MAJOR_VERSION_DR &&
1199              dev->version.minor_version >= HBM_MINOR_VERSION_DR))
1200                 dev->hbm_f_dr_supported = 1;
1201
1202         /* VTag Support */
1203         dev->hbm_f_vt_supported = 0;
1204         if (dev->version.major_version > HBM_MAJOR_VERSION_VT ||
1205             (dev->version.major_version == HBM_MAJOR_VERSION_VT &&
1206              dev->version.minor_version >= HBM_MINOR_VERSION_VT))
1207                 dev->hbm_f_vt_supported = 1;
1208
1209         /* GSC support */
1210         if (dev->version.major_version > HBM_MAJOR_VERSION_GSC ||
1211             (dev->version.major_version == HBM_MAJOR_VERSION_GSC &&
1212              dev->version.minor_version >= HBM_MINOR_VERSION_GSC))
1213                 dev->hbm_f_gsc_supported = 1;
1214
1215         /* Capability message Support */
1216         dev->hbm_f_cap_supported = 0;
1217         if (dev->version.major_version > HBM_MAJOR_VERSION_CAP ||
1218             (dev->version.major_version == HBM_MAJOR_VERSION_CAP &&
1219              dev->version.minor_version >= HBM_MINOR_VERSION_CAP))
1220                 dev->hbm_f_cap_supported = 1;
1221
1222         /* Client DMA Support */
1223         dev->hbm_f_cd_supported = 0;
1224         if (dev->version.major_version > HBM_MAJOR_VERSION_CD ||
1225             (dev->version.major_version == HBM_MAJOR_VERSION_CD &&
1226              dev->version.minor_version >= HBM_MINOR_VERSION_CD))
1227                 dev->hbm_f_cd_supported = 1;
1228 }
1229
1230 /**
1231  * mei_hbm_version_is_supported - checks whether the driver can
1232  *     support the hbm version of the device
1233  *
1234  * @dev: the device structure
1235  * Return: true if driver can support hbm version of the device
1236  */
1237 bool mei_hbm_version_is_supported(struct mei_device *dev)
1238 {
1239         return  (dev->version.major_version < HBM_MAJOR_VERSION) ||
1240                 (dev->version.major_version == HBM_MAJOR_VERSION &&
1241                  dev->version.minor_version <= HBM_MINOR_VERSION);
1242 }
1243
1244 /**
1245  * mei_hbm_dispatch - bottom half read routine after ISR to
1246  * handle the read bus message cmd processing.
1247  *
1248  * @dev: the device structure
1249  * @hdr: header of bus message
1250  *
1251  * Return: 0 on success and < 0 on failure
1252  */
1253 int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
1254 {
1255         struct mei_bus_message *mei_msg;
1256         struct hbm_host_version_response *version_res;
1257         struct hbm_props_response *props_res;
1258         struct hbm_host_enum_response *enum_res;
1259         struct hbm_dma_setup_response *dma_setup_res;
1260         struct hbm_add_client_request *add_cl_req;
1261         struct hbm_capability_response *capability_res;
1262         int ret;
1263
1264         struct mei_hbm_cl_cmd *cl_cmd;
1265         struct hbm_client_connect_request *disconnect_req;
1266         struct hbm_flow_control *fctrl;
1267         struct hbm_client_dma_response *client_dma_res;
1268
1269         /* read the message to our buffer */
1270         BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
1271         mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
1272         mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
1273         cl_cmd  = (struct mei_hbm_cl_cmd *)mei_msg;
1274
1275         /* ignore spurious message and prevent reset nesting
1276          * hbm is put to idle during system reset
1277          */
1278         if (dev->hbm_state == MEI_HBM_IDLE) {
1279                 dev_dbg(dev->dev, "hbm: state is idle ignore spurious messages\n");
1280                 return 0;
1281         }
1282
1283         switch (mei_msg->hbm_cmd) {
1284         case HOST_START_RES_CMD:
1285                 dev_dbg(dev->dev, "hbm: start: response message received.\n");
1286
1287                 dev->init_clients_timer = 0;
1288
1289                 version_res = (struct hbm_host_version_response *)mei_msg;
1290
1291                 dev_dbg(dev->dev, "HBM VERSION: DRIVER=%02d:%02d DEVICE=%02d:%02d\n",
1292                                 HBM_MAJOR_VERSION, HBM_MINOR_VERSION,
1293                                 version_res->me_max_version.major_version,
1294                                 version_res->me_max_version.minor_version);
1295
1296                 if (version_res->host_version_supported) {
1297                         dev->version.major_version = HBM_MAJOR_VERSION;
1298                         dev->version.minor_version = HBM_MINOR_VERSION;
1299                 } else {
1300                         dev->version.major_version =
1301                                 version_res->me_max_version.major_version;
1302                         dev->version.minor_version =
1303                                 version_res->me_max_version.minor_version;
1304                 }
1305
1306                 if (!mei_hbm_version_is_supported(dev)) {
1307                         dev_warn(dev->dev, "hbm: start: version mismatch - stopping the driver.\n");
1308
1309                         dev->hbm_state = MEI_HBM_STOPPED;
1310                         if (mei_hbm_stop_req(dev)) {
1311                                 dev_err(dev->dev, "hbm: start: failed to send stop request\n");
1312                                 return -EIO;
1313                         }
1314                         break;
1315                 }
1316
1317                 mei_hbm_config_features(dev);
1318
1319                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1320                     dev->hbm_state != MEI_HBM_STARTING) {
1321                         if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1322                             dev->dev_state == MEI_DEV_POWERING_DOWN) {
1323                                 dev_dbg(dev->dev, "hbm: start: on shutdown, ignoring\n");
1324                                 return 0;
1325                         }
1326                         dev_err(dev->dev, "hbm: start: state mismatch, [%d, %d]\n",
1327                                 dev->dev_state, dev->hbm_state);
1328                         return -EPROTO;
1329                 }
1330
1331                 if (dev->hbm_f_cap_supported) {
1332                         if (mei_hbm_capabilities_req(dev))
1333                                 return -EIO;
1334                         wake_up(&dev->wait_hbm_start);
1335                         break;
1336                 }
1337
1338                 if (dev->hbm_f_dr_supported) {
1339                         if (mei_dmam_ring_alloc(dev))
1340                                 dev_info(dev->dev, "running w/o dma ring\n");
1341                         if (mei_dma_ring_is_allocated(dev)) {
1342                                 if (mei_hbm_dma_setup_req(dev))
1343                                         return -EIO;
1344
1345                                 wake_up(&dev->wait_hbm_start);
1346                                 break;
1347                         }
1348                 }
1349
1350                 dev->hbm_f_dr_supported = 0;
1351                 mei_dmam_ring_free(dev);
1352
1353                 if (mei_hbm_enum_clients_req(dev))
1354                         return -EIO;
1355
1356                 wake_up(&dev->wait_hbm_start);
1357                 break;
1358
1359         case MEI_HBM_CAPABILITIES_RES_CMD:
1360                 dev_dbg(dev->dev, "hbm: capabilities response: message received.\n");
1361
1362                 dev->init_clients_timer = 0;
1363
1364                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1365                     dev->hbm_state != MEI_HBM_CAP_SETUP) {
1366                         if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1367                             dev->dev_state == MEI_DEV_POWERING_DOWN) {
1368                                 dev_dbg(dev->dev, "hbm: capabilities response: on shutdown, ignoring\n");
1369                                 return 0;
1370                         }
1371                         dev_err(dev->dev, "hbm: capabilities response: state mismatch, [%d, %d]\n",
1372                                 dev->dev_state, dev->hbm_state);
1373                         return -EPROTO;
1374                 }
1375
1376                 capability_res = (struct hbm_capability_response *)mei_msg;
1377                 if (!(capability_res->capability_granted[0] & HBM_CAP_VT))
1378                         dev->hbm_f_vt_supported = 0;
1379                 if (!(capability_res->capability_granted[0] & HBM_CAP_CD))
1380                         dev->hbm_f_cd_supported = 0;
1381
1382                 if (!(capability_res->capability_granted[0] & HBM_CAP_GSC))
1383                         dev->hbm_f_gsc_supported = 0;
1384
1385                 if (dev->hbm_f_dr_supported) {
1386                         if (mei_dmam_ring_alloc(dev))
1387                                 dev_info(dev->dev, "running w/o dma ring\n");
1388                         if (mei_dma_ring_is_allocated(dev)) {
1389                                 if (mei_hbm_dma_setup_req(dev))
1390                                         return -EIO;
1391                                 break;
1392                         }
1393                 }
1394
1395                 dev->hbm_f_dr_supported = 0;
1396                 mei_dmam_ring_free(dev);
1397
1398                 if (mei_hbm_enum_clients_req(dev))
1399                         return -EIO;
1400                 break;
1401
1402         case MEI_HBM_DMA_SETUP_RES_CMD:
1403                 dev_dbg(dev->dev, "hbm: dma setup response: message received.\n");
1404
1405                 dev->init_clients_timer = 0;
1406
1407                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1408                     dev->hbm_state != MEI_HBM_DR_SETUP) {
1409                         if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1410                             dev->dev_state == MEI_DEV_POWERING_DOWN) {
1411                                 dev_dbg(dev->dev, "hbm: dma setup response: on shutdown, ignoring\n");
1412                                 return 0;
1413                         }
1414                         dev_err(dev->dev, "hbm: dma setup response: state mismatch, [%d, %d]\n",
1415                                 dev->dev_state, dev->hbm_state);
1416                         return -EPROTO;
1417                 }
1418
1419                 dma_setup_res = (struct hbm_dma_setup_response *)mei_msg;
1420
1421                 if (dma_setup_res->status) {
1422                         u8 status = dma_setup_res->status;
1423
1424                         if (status == MEI_HBMS_NOT_ALLOWED) {
1425                                 dev_dbg(dev->dev, "hbm: dma setup not allowed\n");
1426                         } else {
1427                                 dev_info(dev->dev, "hbm: dma setup response: failure = %d %s\n",
1428                                          status,
1429                                          mei_hbm_status_str(status));
1430                         }
1431                         dev->hbm_f_dr_supported = 0;
1432                         mei_dmam_ring_free(dev);
1433                 }
1434
1435                 if (mei_hbm_enum_clients_req(dev))
1436                         return -EIO;
1437                 break;
1438
1439         case CLIENT_CONNECT_RES_CMD:
1440                 dev_dbg(dev->dev, "hbm: client connect response: message received.\n");
1441                 mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_CONNECT);
1442                 break;
1443
1444         case CLIENT_DISCONNECT_RES_CMD:
1445                 dev_dbg(dev->dev, "hbm: client disconnect response: message received.\n");
1446                 mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_DISCONNECT);
1447                 break;
1448
1449         case MEI_FLOW_CONTROL_CMD:
1450                 dev_dbg(dev->dev, "hbm: client flow control response: message received.\n");
1451
1452                 fctrl = (struct hbm_flow_control *)mei_msg;
1453                 mei_hbm_cl_tx_flow_ctrl_creds_res(dev, fctrl);
1454                 break;
1455
1456         case MEI_PG_ISOLATION_ENTRY_RES_CMD:
1457                 dev_dbg(dev->dev, "hbm: power gate isolation entry response received\n");
1458                 ret = mei_hbm_pg_enter_res(dev);
1459                 if (ret)
1460                         return ret;
1461                 break;
1462
1463         case MEI_PG_ISOLATION_EXIT_REQ_CMD:
1464                 dev_dbg(dev->dev, "hbm: power gate isolation exit request received\n");
1465                 ret = mei_hbm_pg_exit_res(dev);
1466                 if (ret)
1467                         return ret;
1468                 break;
1469
1470         case HOST_CLIENT_PROPERTIES_RES_CMD:
1471                 dev_dbg(dev->dev, "hbm: properties response: message received.\n");
1472
1473                 dev->init_clients_timer = 0;
1474
1475                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1476                     dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
1477                         if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1478                             dev->dev_state == MEI_DEV_POWERING_DOWN) {
1479                                 dev_dbg(dev->dev, "hbm: properties response: on shutdown, ignoring\n");
1480                                 return 0;
1481                         }
1482                         dev_err(dev->dev, "hbm: properties response: state mismatch, [%d, %d]\n",
1483                                 dev->dev_state, dev->hbm_state);
1484                         return -EPROTO;
1485                 }
1486
1487                 props_res = (struct hbm_props_response *)mei_msg;
1488
1489                 if (props_res->status == MEI_HBMS_CLIENT_NOT_FOUND) {
1490                         dev_dbg(dev->dev, "hbm: properties response: %d CLIENT_NOT_FOUND\n",
1491                                 props_res->me_addr);
1492                 } else if (props_res->status) {
1493                         dev_err(dev->dev, "hbm: properties response: wrong status = %d %s\n",
1494                                 props_res->status,
1495                                 mei_hbm_status_str(props_res->status));
1496                         return -EPROTO;
1497                 } else {
1498                         mei_hbm_me_cl_add(dev, props_res);
1499                 }
1500
1501                 /* request property for the next client */
1502                 if (mei_hbm_prop_req(dev, props_res->me_addr + 1))
1503                         return -EIO;
1504
1505                 break;
1506
1507         case HOST_ENUM_RES_CMD:
1508                 dev_dbg(dev->dev, "hbm: enumeration response: message received\n");
1509
1510                 dev->init_clients_timer = 0;
1511
1512                 enum_res = (struct hbm_host_enum_response *) mei_msg;
1513                 BUILD_BUG_ON(sizeof(dev->me_clients_map)
1514                                 < sizeof(enum_res->valid_addresses));
1515                 memcpy(dev->me_clients_map, enum_res->valid_addresses,
1516                                 sizeof(enum_res->valid_addresses));
1517
1518                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1519                     dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
1520                         if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1521                             dev->dev_state == MEI_DEV_POWERING_DOWN) {
1522                                 dev_dbg(dev->dev, "hbm: enumeration response: on shutdown, ignoring\n");
1523                                 return 0;
1524                         }
1525                         dev_err(dev->dev, "hbm: enumeration response: state mismatch, [%d, %d]\n",
1526                                 dev->dev_state, dev->hbm_state);
1527                         return -EPROTO;
1528                 }
1529
1530                 dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
1531
1532                 /* first property request */
1533                 if (mei_hbm_prop_req(dev, 0))
1534                         return -EIO;
1535
1536                 break;
1537
1538         case HOST_STOP_RES_CMD:
1539                 dev_dbg(dev->dev, "hbm: stop response: message received\n");
1540
1541                 dev->init_clients_timer = 0;
1542
1543                 if (dev->hbm_state != MEI_HBM_STOPPED) {
1544                         dev_err(dev->dev, "hbm: stop response: state mismatch, [%d, %d]\n",
1545                                 dev->dev_state, dev->hbm_state);
1546                         return -EPROTO;
1547                 }
1548
1549                 mei_set_devstate(dev, MEI_DEV_POWER_DOWN);
1550                 dev_info(dev->dev, "hbm: stop response: resetting.\n");
1551                 /* force the reset */
1552                 return -EPROTO;
1553
1554         case CLIENT_DISCONNECT_REQ_CMD:
1555                 dev_dbg(dev->dev, "hbm: disconnect request: message received\n");
1556
1557                 disconnect_req = (struct hbm_client_connect_request *)mei_msg;
1558                 mei_hbm_fw_disconnect_req(dev, disconnect_req);
1559                 break;
1560
1561         case ME_STOP_REQ_CMD:
1562                 dev_dbg(dev->dev, "hbm: stop request: message received\n");
1563                 dev->hbm_state = MEI_HBM_STOPPED;
1564                 if (mei_hbm_stop_req(dev)) {
1565                         dev_err(dev->dev, "hbm: stop request: failed to send stop request\n");
1566                         return -EIO;
1567                 }
1568                 break;
1569
1570         case MEI_HBM_ADD_CLIENT_REQ_CMD:
1571                 dev_dbg(dev->dev, "hbm: add client request received\n");
1572                 /*
1573                  * after the host receives the enum_resp
1574                  * message clients may be added or removed
1575                  */
1576                 if (dev->hbm_state <= MEI_HBM_ENUM_CLIENTS ||
1577                     dev->hbm_state >= MEI_HBM_STOPPED) {
1578                         dev_err(dev->dev, "hbm: add client: state mismatch, [%d, %d]\n",
1579                                 dev->dev_state, dev->hbm_state);
1580                         return -EPROTO;
1581                 }
1582                 add_cl_req = (struct hbm_add_client_request *)mei_msg;
1583                 ret = mei_hbm_fw_add_cl_req(dev, add_cl_req);
1584                 if (ret) {
1585                         dev_err(dev->dev, "hbm: add client: failed to send response %d\n",
1586                                 ret);
1587                         return -EIO;
1588                 }
1589                 dev_dbg(dev->dev, "hbm: add client request processed\n");
1590                 break;
1591
1592         case MEI_HBM_NOTIFY_RES_CMD:
1593                 dev_dbg(dev->dev, "hbm: notify response received\n");
1594                 mei_hbm_cl_res(dev, cl_cmd, notify_res_to_fop(cl_cmd));
1595                 break;
1596
1597         case MEI_HBM_NOTIFICATION_CMD:
1598                 dev_dbg(dev->dev, "hbm: notification\n");
1599                 mei_hbm_cl_notify(dev, cl_cmd);
1600                 break;
1601
1602         case MEI_HBM_CLIENT_DMA_MAP_RES_CMD:
1603                 dev_dbg(dev->dev, "hbm: client dma map response: message received.\n");
1604                 client_dma_res = (struct hbm_client_dma_response *)mei_msg;
1605                 mei_hbm_cl_dma_map_res(dev, client_dma_res);
1606                 break;
1607
1608         case MEI_HBM_CLIENT_DMA_UNMAP_RES_CMD:
1609                 dev_dbg(dev->dev, "hbm: client dma unmap response: message received.\n");
1610                 client_dma_res = (struct hbm_client_dma_response *)mei_msg;
1611                 mei_hbm_cl_dma_unmap_res(dev, client_dma_res);
1612                 break;
1613
1614         default:
1615                 WARN(1, "hbm: wrong command %d\n", mei_msg->hbm_cmd);
1616                 return -EPROTO;
1617
1618         }
1619         return 0;
1620 }
1621