drivers/misc/mei/hbm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2003-2020, 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 static inline int mei_hbm_write_message(struct mei_device *dev,
  96                                         struct mei_msg_hdr *hdr,
  97                                         const void *data)
  98 {
  99         return mei_write_message(dev, hdr, sizeof(*hdr), data, hdr->length);
 100 }
 101
 102 /**
 103  * mei_hbm_idle - set hbm to idle state
 104  *
 105  * @dev: the device structure
 106  */
 107 void mei_hbm_idle(struct mei_device *dev)
 108 {
 109         dev->init_clients_timer = 0;
 110         dev->hbm_state = MEI_HBM_IDLE;
 111 }
 112
 113 /**
 114  * mei_hbm_reset - reset hbm counters and book keeping data structurs
 115  *
 116  * @dev: the device structure
 117  */
 118 void mei_hbm_reset(struct mei_device *dev)
 119 {
 120         mei_me_cl_rm_all(dev);
 121
 122         mei_hbm_idle(dev);
 123 }
 124
 125 /**
 126  * mei_hbm_hdr - construct hbm header
 127  *
 128  * @mei_hdr: hbm header
 129  * @length: payload length
 130  */
 131
 132 static inline void mei_hbm_hdr(struct mei_msg_hdr *mei_hdr, size_t length)
 133 {
 134         memset(mei_hdr, 0, sizeof(*mei_hdr));
 135         mei_hdr->length = length;
 136         mei_hdr->msg_complete = 1;
 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  * @buf: message buffer
 166  * @len: buffer length
 167  *
 168  * Return: 0 on success, <0 on failure.
 169  */
 170 static inline int mei_hbm_cl_write(struct mei_device *dev, struct mei_cl *cl,
 171                                    u8 hbm_cmd, void *buf, size_t len)
 172 {
 173         struct mei_msg_hdr mei_hdr;
 174
 175         mei_hbm_hdr(&mei_hdr, len);
 176         mei_hbm_cl_hdr(cl, hbm_cmd, buf, len);
 177
 178         return mei_hbm_write_message(dev, &mei_hdr, buf);
 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;
 256         struct hbm_host_version_request req;
 257         int ret;
 258
 259         mei_hbm_reset(dev);
 260
 261         mei_hbm_hdr(&mei_hdr, sizeof(req));
 262
 263         /* host start message */
 264         memset(&req, 0, sizeof(req));
 265         req.hbm_cmd = HOST_START_REQ_CMD;
 266         req.host_version.major_version = HBM_MAJOR_VERSION;
 267         req.host_version.minor_version = HBM_MINOR_VERSION;
 268
 269         dev->hbm_state = MEI_HBM_IDLE;
 270         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 271         if (ret) {
 272                 dev_err(dev->dev, "version message write failed: ret = %d\n",
 273                         ret);
 274                 return ret;
 275         }
 276
 277         dev->hbm_state = MEI_HBM_STARTING;
 278         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 279         mei_schedule_stall_timer(dev);
 280         return 0;
 281 }
 282
 283 /**
 284  * mei_hbm_dma_setup_req() - setup DMA request
 285  * @dev: the device structure
 286  *
 287  * Return: 0 on success and < 0 on failure
 288  */
 289 static int mei_hbm_dma_setup_req(struct mei_device *dev)
 290 {
 291         struct mei_msg_hdr mei_hdr;
 292         struct hbm_dma_setup_request req;
 293         unsigned int i;
 294         int ret;
 295
 296         mei_hbm_hdr(&mei_hdr, sizeof(req));
 297
 298         memset(&req, 0, sizeof(req));
 299         req.hbm_cmd = MEI_HBM_DMA_SETUP_REQ_CMD;
 300         for (i = 0; i < DMA_DSCR_NUM; i++) {
 301                 phys_addr_t paddr;
 302
 303                 paddr = dev->dr_dscr[i].daddr;
 304                 req.dma_dscr[i].addr_hi = upper_32_bits(paddr);
 305                 req.dma_dscr[i].addr_lo = lower_32_bits(paddr);
 306                 req.dma_dscr[i].size = dev->dr_dscr[i].size;
 307         }
 308
 309         mei_dma_ring_reset(dev);
 310
 311         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 312         if (ret) {
 313                 dev_err(dev->dev, "dma setup request write failed: ret = %d.\n",
 314                         ret);
 315                 return ret;
 316         }
 317
 318         dev->hbm_state = MEI_HBM_DR_SETUP;
 319         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 320         mei_schedule_stall_timer(dev);
 321         return 0;
 322 }
 323
 324 /**
 325  * mei_hbm_capabilities_req - request capabilities
 326  *
 327  * @dev: the device structure
 328  *
 329  * Return: 0 on success and < 0 on failure
 330  */
 331 static int mei_hbm_capabilities_req(struct mei_device *dev)
 332 {
 333         struct mei_msg_hdr mei_hdr;
 334         struct hbm_capability_request req;
 335         int ret;
 336
 337         mei_hbm_hdr(&mei_hdr, sizeof(req));
 338
 339         memset(&req, 0, sizeof(req));
 340         req.hbm_cmd = MEI_HBM_CAPABILITIES_REQ_CMD;
 341         if (dev->hbm_f_vt_supported)
 342                 req.capability_requested[0] |= HBM_CAP_VT;
 343         if (dev->hbm_f_cd_supported)
 344                 req.capability_requested[0] |= HBM_CAP_CD;
 345
 346         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 347         if (ret) {
 348                 dev_err(dev->dev,
 349                         "capabilities request write failed: ret = %d.\n", ret);
 350                 return ret;
 351         }
 352
 353         dev->hbm_state = MEI_HBM_CAP_SETUP;
 354         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 355         mei_schedule_stall_timer(dev);
 356         return 0;
 357 }
 358
 359 /**
 360  * mei_hbm_enum_clients_req - sends enumeration client request message.
 361  *
 362  * @dev: the device structure
 363  *
 364  * Return: 0 on success and < 0 on failure
 365  */
 366 static int mei_hbm_enum_clients_req(struct mei_device *dev)
 367 {
 368         struct mei_msg_hdr mei_hdr;
 369         struct hbm_host_enum_request req;
 370         int ret;
 371
 372         /* enumerate clients */
 373         mei_hbm_hdr(&mei_hdr, sizeof(req));
 374
 375         memset(&req, 0, sizeof(req));
 376         req.hbm_cmd = HOST_ENUM_REQ_CMD;
 377         req.flags |= dev->hbm_f_dc_supported ? MEI_HBM_ENUM_F_ALLOW_ADD : 0;
 378         req.flags |= dev->hbm_f_ie_supported ?
 379                           MEI_HBM_ENUM_F_IMMEDIATE_ENUM : 0;
 380
 381         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 382         if (ret) {
 383                 dev_err(dev->dev, "enumeration request write failed: ret = %d.\n",
 384                         ret);
 385                 return ret;
 386         }
 387         dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
 388         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 389         mei_schedule_stall_timer(dev);
 390         return 0;
 391 }
 392
 393 /**
 394  * mei_hbm_me_cl_add - add new me client to the list
 395  *
 396  * @dev: the device structure
 397  * @res: hbm property response
 398  *
 399  * Return: 0 on success and -ENOMEM on allocation failure
 400  */
 401
 402 static int mei_hbm_me_cl_add(struct mei_device *dev,
 403                              struct hbm_props_response *res)
 404 {
 405         struct mei_me_client *me_cl;
 406         const uuid_le *uuid = &res->client_properties.protocol_name;
 407
 408         mei_me_cl_rm_by_uuid(dev, uuid);
 409
 410         me_cl = kzalloc(sizeof(*me_cl), GFP_KERNEL);
 411         if (!me_cl)
 412                 return -ENOMEM;
 413
 414         mei_me_cl_init(me_cl);
 415
 416         me_cl->props = res->client_properties;
 417         me_cl->client_id = res->me_addr;
 418         me_cl->tx_flow_ctrl_creds = 0;
 419
 420         mei_me_cl_add(dev, me_cl);
 421
 422         return 0;
 423 }
 424
 425 /**
 426  * mei_hbm_add_cl_resp - send response to fw on client add request
 427  *
 428  * @dev: the device structure
 429  * @addr: me address
 430  * @status: response status
 431  *
 432  * Return: 0 on success and < 0 on failure
 433  */
 434 static int mei_hbm_add_cl_resp(struct mei_device *dev, u8 addr, u8 status)
 435 {
 436         struct mei_msg_hdr mei_hdr;
 437         struct hbm_add_client_response resp;
 438         int ret;
 439
 440         dev_dbg(dev->dev, "adding client response\n");
 441
 442         mei_hbm_hdr(&mei_hdr, sizeof(resp));
 443
 444         memset(&resp, 0, sizeof(resp));
 445         resp.hbm_cmd = MEI_HBM_ADD_CLIENT_RES_CMD;
 446         resp.me_addr = addr;
 447         resp.status  = status;
 448
 449         ret = mei_hbm_write_message(dev, &mei_hdr, &resp);
 450         if (ret)
 451                 dev_err(dev->dev, "add client response write failed: ret = %d\n",
 452                         ret);
 453         return ret;
 454 }
 455
 456 /**
 457  * mei_hbm_fw_add_cl_req - request from the fw to add a client
 458  *
 459  * @dev: the device structure
 460  * @req: add client request
 461  *
 462  * Return: 0 on success and < 0 on failure
 463  */
 464 static int mei_hbm_fw_add_cl_req(struct mei_device *dev,
 465                               struct hbm_add_client_request *req)
 466 {
 467         int ret;
 468         u8 status = MEI_HBMS_SUCCESS;
 469
 470         BUILD_BUG_ON(sizeof(struct hbm_add_client_request) !=
 471                         sizeof(struct hbm_props_response));
 472
 473         ret = mei_hbm_me_cl_add(dev, (struct hbm_props_response *)req);
 474         if (ret)
 475                 status = !MEI_HBMS_SUCCESS;
 476
 477         if (dev->dev_state == MEI_DEV_ENABLED)
 478                 schedule_work(&dev->bus_rescan_work);
 479
 480         return mei_hbm_add_cl_resp(dev, req->me_addr, status);
 481 }
 482
 483 /**
 484  * mei_hbm_cl_notify_req - send notification request
 485  *
 486  * @dev: the device structure
 487  * @cl: a client to disconnect from
 488  * @start: true for start false for stop
 489  *
 490  * Return: 0 on success and -EIO on write failure
 491  */
 492 int mei_hbm_cl_notify_req(struct mei_device *dev,
 493                           struct mei_cl *cl, u8 start)
 494 {
 495
 496         struct mei_msg_hdr mei_hdr;
 497         struct hbm_notification_request req;
 498         int ret;
 499
 500         mei_hbm_hdr(&mei_hdr, sizeof(req));
 501         mei_hbm_cl_hdr(cl, MEI_HBM_NOTIFY_REQ_CMD, &req, sizeof(req));
 502
 503         req.start = start;
 504
 505         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 506         if (ret)
 507                 dev_err(dev->dev, "notify request failed: ret = %d\n", ret);
 508
 509         return ret;
 510 }
 511
 512 /**
 513  *  notify_res_to_fop - convert notification response to the proper
 514  *      notification FOP
 515  *
 516  * @cmd: client notification start response command
 517  *
 518  * Return:  MEI_FOP_NOTIFY_START or MEI_FOP_NOTIFY_STOP;
 519  */
 520 static inline enum mei_cb_file_ops notify_res_to_fop(struct mei_hbm_cl_cmd *cmd)
 521 {
 522         struct hbm_notification_response *rs =
 523                 (struct hbm_notification_response *)cmd;
 524
 525         return mei_cl_notify_req2fop(rs->start);
 526 }
 527
 528 /**
 529  * mei_hbm_cl_notify_start_res - update the client state according
 530  *       notify start response
 531  *
 532  * @dev: the device structure
 533  * @cl: mei host client
 534  * @cmd: client notification start response command
 535  */
 536 static void mei_hbm_cl_notify_start_res(struct mei_device *dev,
 537                                         struct mei_cl *cl,
 538                                         struct mei_hbm_cl_cmd *cmd)
 539 {
 540         struct hbm_notification_response *rs =
 541                 (struct hbm_notification_response *)cmd;
 542
 543         cl_dbg(dev, cl, "hbm: notify start response status=%d\n", rs->status);
 544
 545         if (rs->status == MEI_HBMS_SUCCESS ||
 546             rs->status == MEI_HBMS_ALREADY_STARTED) {
 547                 cl->notify_en = true;
 548                 cl->status = 0;
 549         } else {
 550                 cl->status = -EINVAL;
 551         }
 552 }
 553
 554 /**
 555  * mei_hbm_cl_notify_stop_res - update the client state according
 556  *       notify stop response
 557  *
 558  * @dev: the device structure
 559  * @cl: mei host client
 560  * @cmd: client notification stop response command
 561  */
 562 static void mei_hbm_cl_notify_stop_res(struct mei_device *dev,
 563                                        struct mei_cl *cl,
 564                                        struct mei_hbm_cl_cmd *cmd)
 565 {
 566         struct hbm_notification_response *rs =
 567                 (struct hbm_notification_response *)cmd;
 568
 569         cl_dbg(dev, cl, "hbm: notify stop response status=%d\n", rs->status);
 570
 571         if (rs->status == MEI_HBMS_SUCCESS ||
 572             rs->status == MEI_HBMS_NOT_STARTED) {
 573                 cl->notify_en = false;
 574                 cl->status = 0;
 575         } else {
 576                 /* TODO: spec is not clear yet about other possible issues */
 577                 cl->status = -EINVAL;
 578         }
 579 }
 580
 581 /**
 582  * mei_hbm_cl_notify - signal notification event
 583  *
 584  * @dev: the device structure
 585  * @cmd: notification client message
 586  */
 587 static void mei_hbm_cl_notify(struct mei_device *dev,
 588                               struct mei_hbm_cl_cmd *cmd)
 589 {
 590         struct mei_cl *cl;
 591
 592         cl = mei_hbm_cl_find_by_cmd(dev, cmd);
 593         if (cl)
 594                 mei_cl_notify(cl);
 595 }
 596
 597 /**
 598  * mei_hbm_cl_dma_map_req - send client dma map request
 599  *
 600  * @dev: the device structure
 601  * @cl: mei host client
 602  *
 603  * Return: 0 on success and -EIO on write failure
 604  */
 605 int mei_hbm_cl_dma_map_req(struct mei_device *dev, struct mei_cl *cl)
 606 {
 607         struct mei_msg_hdr mei_hdr;
 608         struct hbm_client_dma_map_request req;
 609         int ret;
 610
 611         mei_hbm_hdr(&mei_hdr, sizeof(req));
 612
 613         memset(&req, 0, sizeof(req));
 614
 615         req.hbm_cmd = MEI_HBM_CLIENT_DMA_MAP_REQ_CMD;
 616         req.client_buffer_id = cl->dma.buffer_id;
 617         req.address_lsb = lower_32_bits(cl->dma.daddr);
 618         req.address_msb = upper_32_bits(cl->dma.daddr);
 619         req.size = cl->dma.size;
 620
 621         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 622         if (ret)
 623                 dev_err(dev->dev, "dma map request failed: ret = %d\n", ret);
 624
 625         return ret;
 626 }
 627
 628 /**
 629  * mei_hbm_cl_dma_unmap_req - send client dma unmap request
 630  *
 631  * @dev: the device structure
 632  * @cl: mei host client
 633  *
 634  * Return: 0 on success and -EIO on write failure
 635  */
 636 int mei_hbm_cl_dma_unmap_req(struct mei_device *dev, struct mei_cl *cl)
 637 {
 638         struct mei_msg_hdr mei_hdr;
 639         struct hbm_client_dma_unmap_request req;
 640         int ret;
 641
 642         mei_hbm_hdr(&mei_hdr, sizeof(req));
 643
 644         memset(&req, 0, sizeof(req));
 645
 646         req.hbm_cmd = MEI_HBM_CLIENT_DMA_UNMAP_REQ_CMD;
 647         req.client_buffer_id = cl->dma.buffer_id;
 648
 649         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 650         if (ret)
 651                 dev_err(dev->dev, "dma unmap request failed: ret = %d\n", ret);
 652
 653         return ret;
 654 }
 655
 656 static void mei_hbm_cl_dma_map_res(struct mei_device *dev,
 657                                    struct hbm_client_dma_response *res)
 658 {
 659         struct mei_cl *cl;
 660         struct mei_cl_cb *cb, *next;
 661
 662         cl = NULL;
 663         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
 664                 if (cb->fop_type != MEI_FOP_DMA_MAP)
 665                         continue;
 666                 if (!cb->cl->dma.buffer_id || cb->cl->dma_mapped)
 667                         continue;
 668
 669                 cl = cb->cl;
 670                 break;
 671         }
 672         if (!cl)
 673                 return;
 674
 675         dev_dbg(dev->dev, "cl dma map result = %d\n", res->status);
 676         cl->status = res->status;
 677         if (!cl->status)
 678                 cl->dma_mapped = 1;
 679         wake_up(&cl->wait);
 680 }
 681
 682 static void mei_hbm_cl_dma_unmap_res(struct mei_device *dev,
 683                                      struct hbm_client_dma_response *res)
 684 {
 685         struct mei_cl *cl;
 686         struct mei_cl_cb *cb, *next;
 687
 688         cl = NULL;
 689         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
 690                 if (cb->fop_type != MEI_FOP_DMA_UNMAP)
 691                         continue;
 692                 if (!cb->cl->dma.buffer_id || !cb->cl->dma_mapped)
 693                         continue;
 694
 695                 cl = cb->cl;
 696                 break;
 697         }
 698         if (!cl)
 699                 return;
 700
 701         dev_dbg(dev->dev, "cl dma unmap result = %d\n", res->status);
 702         cl->status = res->status;
 703         if (!cl->status)
 704                 cl->dma_mapped = 0;
 705         wake_up(&cl->wait);
 706 }
 707
 708 /**
 709  * mei_hbm_prop_req - request property for a single client
 710  *
 711  * @dev: the device structure
 712  * @start_idx: client index to start search
 713  *
 714  * Return: 0 on success and < 0 on failure
 715  */
 716 static int mei_hbm_prop_req(struct mei_device *dev, unsigned long start_idx)
 717 {
 718         struct mei_msg_hdr mei_hdr;
 719         struct hbm_props_request req;
 720         unsigned long addr;
 721         int ret;
 722
 723         addr = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, start_idx);
 724
 725         /* We got all client properties */
 726         if (addr == MEI_CLIENTS_MAX) {
 727                 dev->hbm_state = MEI_HBM_STARTED;
 728                 mei_host_client_init(dev);
 729                 return 0;
 730         }
 731
 732         mei_hbm_hdr(&mei_hdr, sizeof(req));
 733
 734         memset(&req, 0, sizeof(req));
 735
 736         req.hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
 737         req.me_addr = addr;
 738
 739         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 740         if (ret) {
 741                 dev_err(dev->dev, "properties request write failed: ret = %d\n",
 742                         ret);
 743                 return ret;
 744         }
 745
 746         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
 747         mei_schedule_stall_timer(dev);
 748
 749         return 0;
 750 }
 751
 752 /**
 753  * mei_hbm_pg - sends pg command
 754  *
 755  * @dev: the device structure
 756  * @pg_cmd: the pg command code
 757  *
 758  * Return: -EIO on write failure
 759  *         -EOPNOTSUPP if the operation is not supported by the protocol
 760  */
 761 int mei_hbm_pg(struct mei_device *dev, u8 pg_cmd)
 762 {
 763         struct mei_msg_hdr mei_hdr;
 764         struct hbm_power_gate req;
 765         int ret;
 766
 767         if (!dev->hbm_f_pg_supported)
 768                 return -EOPNOTSUPP;
 769
 770         mei_hbm_hdr(&mei_hdr, sizeof(req));
 771
 772         memset(&req, 0, sizeof(req));
 773         req.hbm_cmd = pg_cmd;
 774
 775         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 776         if (ret)
 777                 dev_err(dev->dev, "power gate command write failed.\n");
 778         return ret;
 779 }
 780 EXPORT_SYMBOL_GPL(mei_hbm_pg);
 781
 782 /**
 783  * mei_hbm_stop_req - send stop request message
 784  *
 785  * @dev: mei device
 786  *
 787  * Return: -EIO on write failure
 788  */
 789 static int mei_hbm_stop_req(struct mei_device *dev)
 790 {
 791         struct mei_msg_hdr mei_hdr;
 792         struct hbm_host_stop_request req;
 793
 794         mei_hbm_hdr(&mei_hdr, sizeof(req));
 795
 796         memset(&req, 0, sizeof(req));
 797         req.hbm_cmd = HOST_STOP_REQ_CMD;
 798         req.reason = DRIVER_STOP_REQUEST;
 799
 800         return mei_hbm_write_message(dev, &mei_hdr, &req);
 801 }
 802
 803 /**
 804  * mei_hbm_cl_flow_control_req - sends flow control request.
 805  *
 806  * @dev: the device structure
 807  * @cl: client info
 808  *
 809  * Return: -EIO on write failure
 810  */
 811 int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
 812 {
 813         struct hbm_flow_control req;
 814
 815         cl_dbg(dev, cl, "sending flow control\n");
 816         return mei_hbm_cl_write(dev, cl, MEI_FLOW_CONTROL_CMD,
 817                                 &req, sizeof(req));
 818 }
 819
 820 /**
 821  * mei_hbm_add_single_tx_flow_ctrl_creds - adds single buffer credentials.
 822  *
 823  * @dev: the device structure
 824  * @fctrl: flow control response bus message
 825  *
 826  * Return: 0 on success, < 0 otherwise
 827  */
 828 static int mei_hbm_add_single_tx_flow_ctrl_creds(struct mei_device *dev,
 829                                                  struct hbm_flow_control *fctrl)
 830 {
 831         struct mei_me_client *me_cl;
 832         int rets;
 833
 834         me_cl = mei_me_cl_by_id(dev, fctrl->me_addr);
 835         if (!me_cl) {
 836                 dev_err(dev->dev, "no such me client %d\n", fctrl->me_addr);
 837                 return -ENOENT;
 838         }
 839
 840         if (WARN_ON(me_cl->props.single_recv_buf == 0)) {
 841                 rets = -EINVAL;
 842                 goto out;
 843         }
 844
 845         me_cl->tx_flow_ctrl_creds++;
 846         dev_dbg(dev->dev, "recv flow ctrl msg ME %d (single) creds = %d.\n",
 847                 fctrl->me_addr, me_cl->tx_flow_ctrl_creds);
 848
 849         rets = 0;
 850 out:
 851         mei_me_cl_put(me_cl);
 852         return rets;
 853 }
 854
 855 /**
 856  * mei_hbm_cl_tx_flow_ctrl_creds_res - flow control response from me
 857  *
 858  * @dev: the device structure
 859  * @fctrl: flow control response bus message
 860  */
 861 static void mei_hbm_cl_tx_flow_ctrl_creds_res(struct mei_device *dev,
 862                                                struct hbm_flow_control *fctrl)
 863 {
 864         struct mei_cl *cl;
 865
 866         if (!fctrl->host_addr) {
 867                 /* single receive buffer */
 868                 mei_hbm_add_single_tx_flow_ctrl_creds(dev, fctrl);
 869                 return;
 870         }
 871
 872         cl = mei_hbm_cl_find_by_cmd(dev, fctrl);
 873         if (cl) {
 874                 cl->tx_flow_ctrl_creds++;
 875                 cl_dbg(dev, cl, "flow control creds = %d.\n",
 876                                 cl->tx_flow_ctrl_creds);
 877         }
 878 }
 879
 880
 881 /**
 882  * mei_hbm_cl_disconnect_req - sends disconnect message to fw.
 883  *
 884  * @dev: the device structure
 885  * @cl: a client to disconnect from
 886  *
 887  * Return: -EIO on write failure
 888  */
 889 int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
 890 {
 891         struct hbm_client_connect_request req;
 892
 893         return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_REQ_CMD,
 894                                 &req, sizeof(req));
 895 }
 896
 897 /**
 898  * mei_hbm_cl_disconnect_rsp - sends disconnect respose to the FW
 899  *
 900  * @dev: the device structure
 901  * @cl: a client to disconnect from
 902  *
 903  * Return: -EIO on write failure
 904  */
 905 int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
 906 {
 907         struct hbm_client_connect_response resp;
 908
 909         return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_RES_CMD,
 910                                 &resp, sizeof(resp));
 911 }
 912
 913 /**
 914  * mei_hbm_cl_disconnect_res - update the client state according
 915  *       disconnect response
 916  *
 917  * @dev: the device structure
 918  * @cl: mei host client
 919  * @cmd: disconnect client response host bus message
 920  */
 921 static void mei_hbm_cl_disconnect_res(struct mei_device *dev, struct mei_cl *cl,
 922                                       struct mei_hbm_cl_cmd *cmd)
 923 {
 924         struct hbm_client_connect_response *rs =
 925                 (struct hbm_client_connect_response *)cmd;
 926
 927         cl_dbg(dev, cl, "hbm: disconnect response status=%d\n", rs->status);
 928
 929         if (rs->status == MEI_CL_DISCONN_SUCCESS)
 930                 cl->state = MEI_FILE_DISCONNECT_REPLY;
 931         cl->status = 0;
 932 }
 933
 934 /**
 935  * mei_hbm_cl_connect_req - send connection request to specific me client
 936  *
 937  * @dev: the device structure
 938  * @cl: a client to connect to
 939  *
 940  * Return: -EIO on write failure
 941  */
 942 int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
 943 {
 944         struct hbm_client_connect_request req;
 945
 946         return mei_hbm_cl_write(dev, cl, CLIENT_CONNECT_REQ_CMD,
 947                                 &req, sizeof(req));
 948 }
 949
 950 /**
 951  * mei_hbm_cl_connect_res - update the client state according
 952  *        connection response
 953  *
 954  * @dev: the device structure
 955  * @cl: mei host client
 956  * @cmd: connect client response host bus message
 957  */
 958 static void mei_hbm_cl_connect_res(struct mei_device *dev, struct mei_cl *cl,
 959                                    struct mei_hbm_cl_cmd *cmd)
 960 {
 961         struct hbm_client_connect_response *rs =
 962                 (struct hbm_client_connect_response *)cmd;
 963
 964         cl_dbg(dev, cl, "hbm: connect response status=%s\n",
 965                         mei_cl_conn_status_str(rs->status));
 966
 967         if (rs->status == MEI_CL_CONN_SUCCESS)
 968                 cl->state = MEI_FILE_CONNECTED;
 969         else {
 970                 cl->state = MEI_FILE_DISCONNECT_REPLY;
 971                 if (rs->status == MEI_CL_CONN_NOT_FOUND) {
 972                         mei_me_cl_del(dev, cl->me_cl);
 973                         if (dev->dev_state == MEI_DEV_ENABLED)
 974                                 schedule_work(&dev->bus_rescan_work);
 975                 }
 976         }
 977         cl->status = mei_cl_conn_status_to_errno(rs->status);
 978 }
 979
 980 /**
 981  * mei_hbm_cl_res - process hbm response received on behalf
 982  *         an client
 983  *
 984  * @dev: the device structure
 985  * @rs:  hbm client message
 986  * @fop_type: file operation type
 987  */
 988 static void mei_hbm_cl_res(struct mei_device *dev,
 989                            struct mei_hbm_cl_cmd *rs,
 990                            enum mei_cb_file_ops fop_type)
 991 {
 992         struct mei_cl *cl;
 993         struct mei_cl_cb *cb, *next;
 994
 995         cl = NULL;
 996         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
 997
 998                 cl = cb->cl;
 999
1000                 if (cb->fop_type != fop_type)
1001                         continue;
1002
1003                 if (mei_hbm_cl_addr_equal(cl, rs)) {
1004                         list_del_init(&cb->list);
1005                         break;
1006                 }
1007         }
1008
1009         if (!cl)
1010                 return;
1011
1012         switch (fop_type) {
1013         case MEI_FOP_CONNECT:
1014                 mei_hbm_cl_connect_res(dev, cl, rs);
1015                 break;
1016         case MEI_FOP_DISCONNECT:
1017                 mei_hbm_cl_disconnect_res(dev, cl, rs);
1018                 break;
1019         case MEI_FOP_NOTIFY_START:
1020                 mei_hbm_cl_notify_start_res(dev, cl, rs);
1021                 break;
1022         case MEI_FOP_NOTIFY_STOP:
1023                 mei_hbm_cl_notify_stop_res(dev, cl, rs);
1024                 break;
1025         default:
1026                 return;
1027         }
1028
1029         cl->timer_count = 0;
1030         wake_up(&cl->wait);
1031 }
1032
1033
1034 /**
1035  * mei_hbm_fw_disconnect_req - disconnect request initiated by ME firmware
1036  *  host sends disconnect response
1037  *
1038  * @dev: the device structure.
1039  * @disconnect_req: disconnect request bus message from the me
1040  *
1041  * Return: -ENOMEM on allocation failure
1042  */
1043 static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
1044                 struct hbm_client_connect_request *disconnect_req)
1045 {
1046         struct mei_cl *cl;
1047         struct mei_cl_cb *cb;
1048
1049         cl = mei_hbm_cl_find_by_cmd(dev, disconnect_req);
1050         if (cl) {
1051                 cl_warn(dev, cl, "fw disconnect request received\n");
1052                 cl->state = MEI_FILE_DISCONNECTING;
1053                 cl->timer_count = 0;
1054
1055                 cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DISCONNECT_RSP,
1056                                                NULL);
1057                 if (!cb)
1058                         return -ENOMEM;
1059         }
1060         return 0;
1061 }
1062
1063 /**
1064  * mei_hbm_pg_enter_res - PG enter response received
1065  *
1066  * @dev: the device structure.
1067  *
1068  * Return: 0 on success, -EPROTO on state mismatch
1069  */
1070 static int mei_hbm_pg_enter_res(struct mei_device *dev)
1071 {
1072         if (mei_pg_state(dev) != MEI_PG_OFF ||
1073             dev->pg_event != MEI_PG_EVENT_WAIT) {
1074                 dev_err(dev->dev, "hbm: pg entry response: state mismatch [%s, %d]\n",
1075                         mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
1076                 return -EPROTO;
1077         }
1078
1079         dev->pg_event = MEI_PG_EVENT_RECEIVED;
1080         wake_up(&dev->wait_pg);
1081
1082         return 0;
1083 }
1084
1085 /**
1086  * mei_hbm_pg_resume - process with PG resume
1087  *
1088  * @dev: the device structure.
1089  */
1090 void mei_hbm_pg_resume(struct mei_device *dev)
1091 {
1092         pm_request_resume(dev->dev);
1093 }
1094 EXPORT_SYMBOL_GPL(mei_hbm_pg_resume);
1095
1096 /**
1097  * mei_hbm_pg_exit_res - PG exit response received
1098  *
1099  * @dev: the device structure.
1100  *
1101  * Return: 0 on success, -EPROTO on state mismatch
1102  */
1103 static int mei_hbm_pg_exit_res(struct mei_device *dev)
1104 {
1105         if (mei_pg_state(dev) != MEI_PG_ON ||
1106             (dev->pg_event != MEI_PG_EVENT_WAIT &&
1107              dev->pg_event != MEI_PG_EVENT_IDLE)) {
1108                 dev_err(dev->dev, "hbm: pg exit response: state mismatch [%s, %d]\n",
1109                         mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
1110                 return -EPROTO;
1111         }
1112
1113         switch (dev->pg_event) {
1114         case MEI_PG_EVENT_WAIT:
1115                 dev->pg_event = MEI_PG_EVENT_RECEIVED;
1116                 wake_up(&dev->wait_pg);
1117                 break;
1118         case MEI_PG_EVENT_IDLE:
1119                 /*
1120                 * If the driver is not waiting on this then
1121                 * this is HW initiated exit from PG.
1122                 * Start runtime pm resume sequence to exit from PG.
1123                 */
1124                 dev->pg_event = MEI_PG_EVENT_RECEIVED;
1125                 mei_hbm_pg_resume(dev);
1126                 break;
1127         default:
1128                 WARN(1, "hbm: pg exit response: unexpected pg event = %d\n",
1129                      dev->pg_event);
1130                 return -EPROTO;
1131         }
1132
1133         return 0;
1134 }
1135
1136 /**
1137  * mei_hbm_config_features - check what hbm features and commands
1138  *        are supported by the fw
1139  *
1140  * @dev: the device structure
1141  */
1142 static void mei_hbm_config_features(struct mei_device *dev)
1143 {
1144         /* Power Gating Isolation Support */
1145         dev->hbm_f_pg_supported = 0;
1146         if (dev->version.major_version > HBM_MAJOR_VERSION_PGI)
1147                 dev->hbm_f_pg_supported = 1;
1148
1149         if (dev->version.major_version == HBM_MAJOR_VERSION_PGI &&
1150             dev->version.minor_version >= HBM_MINOR_VERSION_PGI)
1151                 dev->hbm_f_pg_supported = 1;
1152
1153         dev->hbm_f_dc_supported = 0;
1154         if (dev->version.major_version >= HBM_MAJOR_VERSION_DC)
1155                 dev->hbm_f_dc_supported = 1;
1156
1157         dev->hbm_f_ie_supported = 0;
1158         if (dev->version.major_version >= HBM_MAJOR_VERSION_IE)
1159                 dev->hbm_f_ie_supported = 1;
1160
1161         /* disconnect on connect timeout instead of link reset */
1162         dev->hbm_f_dot_supported = 0;
1163         if (dev->version.major_version >= HBM_MAJOR_VERSION_DOT)
1164                 dev->hbm_f_dot_supported = 1;
1165
1166         /* Notification Event Support */
1167         dev->hbm_f_ev_supported = 0;
1168         if (dev->version.major_version >= HBM_MAJOR_VERSION_EV)
1169                 dev->hbm_f_ev_supported = 1;
1170
1171         /* Fixed Address Client Support */
1172         dev->hbm_f_fa_supported = 0;
1173         if (dev->version.major_version >= HBM_MAJOR_VERSION_FA)
1174                 dev->hbm_f_fa_supported = 1;
1175
1176         /* OS ver message Support */
1177         dev->hbm_f_os_supported = 0;
1178         if (dev->version.major_version >= HBM_MAJOR_VERSION_OS)
1179                 dev->hbm_f_os_supported = 1;
1180
1181         /* DMA Ring Support */
1182         dev->hbm_f_dr_supported = 0;
1183         if (dev->version.major_version > HBM_MAJOR_VERSION_DR ||
1184             (dev->version.major_version == HBM_MAJOR_VERSION_DR &&
1185              dev->version.minor_version >= HBM_MINOR_VERSION_DR))
1186                 dev->hbm_f_dr_supported = 1;
1187
1188         /* VTag Support */
1189         dev->hbm_f_vt_supported = 0;
1190         if (dev->version.major_version > HBM_MAJOR_VERSION_VT ||
1191             (dev->version.major_version == HBM_MAJOR_VERSION_VT &&
1192              dev->version.minor_version >= HBM_MINOR_VERSION_VT))
1193                 dev->hbm_f_vt_supported = 1;
1194
1195         /* Capability message Support */
1196         dev->hbm_f_cap_supported = 0;
1197         if (dev->version.major_version > HBM_MAJOR_VERSION_CAP ||
1198             (dev->version.major_version == HBM_MAJOR_VERSION_CAP &&
1199              dev->version.minor_version >= HBM_MINOR_VERSION_CAP))
1200                 dev->hbm_f_cap_supported = 1;
1201
1202         /* Client DMA Support */
1203         dev->hbm_f_cd_supported = 0;
1204         if (dev->version.major_version > HBM_MAJOR_VERSION_CD ||
1205             (dev->version.major_version == HBM_MAJOR_VERSION_CD &&
1206              dev->version.minor_version >= HBM_MINOR_VERSION_CD))
1207                 dev->hbm_f_cd_supported = 1;
1208 }
1209
1210 /**
1211  * mei_hbm_version_is_supported - checks whether the driver can
1212  *     support the hbm version of the device
1213  *
1214  * @dev: the device structure
1215  * Return: true if driver can support hbm version of the device
1216  */
1217 bool mei_hbm_version_is_supported(struct mei_device *dev)
1218 {
1219         return  (dev->version.major_version < HBM_MAJOR_VERSION) ||
1220                 (dev->version.major_version == HBM_MAJOR_VERSION &&
1221                  dev->version.minor_version <= HBM_MINOR_VERSION);
1222 }
1223
1224 /**
1225  * mei_hbm_dispatch - bottom half read routine after ISR to
1226  * handle the read bus message cmd processing.
1227  *
1228  * @dev: the device structure
1229  * @hdr: header of bus message
1230  *
1231  * Return: 0 on success and < 0 on failure
1232  */
1233 int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
1234 {
1235         struct mei_bus_message *mei_msg;
1236         struct hbm_host_version_response *version_res;
1237         struct hbm_props_response *props_res;
1238         struct hbm_host_enum_response *enum_res;
1239         struct hbm_dma_setup_response *dma_setup_res;
1240         struct hbm_add_client_request *add_cl_req;
1241         struct hbm_capability_response *capability_res;
1242         int ret;
1243
1244         struct mei_hbm_cl_cmd *cl_cmd;
1245         struct hbm_client_connect_request *disconnect_req;
1246         struct hbm_flow_control *fctrl;
1247         struct hbm_client_dma_response *client_dma_res;
1248
1249         /* read the message to our buffer */
1250         BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
1251         mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
1252         mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
1253         cl_cmd  = (struct mei_hbm_cl_cmd *)mei_msg;
1254
1255         /* ignore spurious message and prevent reset nesting
1256          * hbm is put to idle during system reset
1257          */
1258         if (dev->hbm_state == MEI_HBM_IDLE) {
1259                 dev_dbg(dev->dev, "hbm: state is idle ignore spurious messages\n");
1260                 return 0;
1261         }
1262
1263         switch (mei_msg->hbm_cmd) {
1264         case HOST_START_RES_CMD:
1265                 dev_dbg(dev->dev, "hbm: start: response message received.\n");
1266
1267                 dev->init_clients_timer = 0;
1268
1269                 version_res = (struct hbm_host_version_response *)mei_msg;
1270
1271                 dev_dbg(dev->dev, "HBM VERSION: DRIVER=%02d:%02d DEVICE=%02d:%02d\n",
1272                                 HBM_MAJOR_VERSION, HBM_MINOR_VERSION,
1273                                 version_res->me_max_version.major_version,
1274                                 version_res->me_max_version.minor_version);
1275
1276                 if (version_res->host_version_supported) {
1277                         dev->version.major_version = HBM_MAJOR_VERSION;
1278                         dev->version.minor_version = HBM_MINOR_VERSION;
1279                 } else {
1280                         dev->version.major_version =
1281                                 version_res->me_max_version.major_version;
1282                         dev->version.minor_version =
1283                                 version_res->me_max_version.minor_version;
1284                 }
1285
1286                 if (!mei_hbm_version_is_supported(dev)) {
1287                         dev_warn(dev->dev, "hbm: start: version mismatch - stopping the driver.\n");
1288
1289                         dev->hbm_state = MEI_HBM_STOPPED;
1290                         if (mei_hbm_stop_req(dev)) {
1291                                 dev_err(dev->dev, "hbm: start: failed to send stop request\n");
1292                                 return -EIO;
1293                         }
1294                         break;
1295                 }
1296
1297                 mei_hbm_config_features(dev);
1298
1299                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1300                     dev->hbm_state != MEI_HBM_STARTING) {
1301                         if (dev->dev_state == MEI_DEV_POWER_DOWN) {
1302                                 dev_dbg(dev->dev, "hbm: start: on shutdown, ignoring\n");
1303                                 return 0;
1304                         }
1305                         dev_err(dev->dev, "hbm: start: state mismatch, [%d, %d]\n",
1306                                 dev->dev_state, dev->hbm_state);
1307                         return -EPROTO;
1308                 }
1309
1310                 if (dev->hbm_f_cap_supported) {
1311                         if (mei_hbm_capabilities_req(dev))
1312                                 return -EIO;
1313                         wake_up(&dev->wait_hbm_start);
1314                         break;
1315                 }
1316
1317                 if (dev->hbm_f_dr_supported) {
1318                         if (mei_dmam_ring_alloc(dev))
1319                                 dev_info(dev->dev, "running w/o dma ring\n");
1320                         if (mei_dma_ring_is_allocated(dev)) {
1321                                 if (mei_hbm_dma_setup_req(dev))
1322                                         return -EIO;
1323
1324                                 wake_up(&dev->wait_hbm_start);
1325                                 break;
1326                         }
1327                 }
1328
1329                 dev->hbm_f_dr_supported = 0;
1330                 mei_dmam_ring_free(dev);
1331
1332                 if (mei_hbm_enum_clients_req(dev))
1333                         return -EIO;
1334
1335                 wake_up(&dev->wait_hbm_start);
1336                 break;
1337
1338         case MEI_HBM_CAPABILITIES_RES_CMD:
1339                 dev_dbg(dev->dev, "hbm: capabilities response: message received.\n");
1340
1341                 dev->init_clients_timer = 0;
1342
1343                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1344                     dev->hbm_state != MEI_HBM_CAP_SETUP) {
1345                         if (dev->dev_state == MEI_DEV_POWER_DOWN) {
1346                                 dev_dbg(dev->dev, "hbm: capabilities response: on shutdown, ignoring\n");
1347                                 return 0;
1348                         }
1349                         dev_err(dev->dev, "hbm: capabilities response: state mismatch, [%d, %d]\n",
1350                                 dev->dev_state, dev->hbm_state);
1351                         return -EPROTO;
1352                 }
1353
1354                 capability_res = (struct hbm_capability_response *)mei_msg;
1355                 if (!(capability_res->capability_granted[0] & HBM_CAP_VT))
1356                         dev->hbm_f_vt_supported = 0;
1357                 if (!(capability_res->capability_granted[0] & HBM_CAP_CD))
1358                         dev->hbm_f_cd_supported = 0;
1359
1360                 if (dev->hbm_f_dr_supported) {
1361                         if (mei_dmam_ring_alloc(dev))
1362                                 dev_info(dev->dev, "running w/o dma ring\n");
1363                         if (mei_dma_ring_is_allocated(dev)) {
1364                                 if (mei_hbm_dma_setup_req(dev))
1365                                         return -EIO;
1366                                 break;
1367                         }
1368                 }
1369
1370                 dev->hbm_f_dr_supported = 0;
1371                 mei_dmam_ring_free(dev);
1372
1373                 if (mei_hbm_enum_clients_req(dev))
1374                         return -EIO;
1375                 break;
1376
1377         case MEI_HBM_DMA_SETUP_RES_CMD:
1378                 dev_dbg(dev->dev, "hbm: dma setup response: message received.\n");
1379
1380                 dev->init_clients_timer = 0;
1381
1382                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1383                     dev->hbm_state != MEI_HBM_DR_SETUP) {
1384                         if (dev->dev_state == MEI_DEV_POWER_DOWN) {
1385                                 dev_dbg(dev->dev, "hbm: dma setup response: on shutdown, ignoring\n");
1386                                 return 0;
1387                         }
1388                         dev_err(dev->dev, "hbm: dma setup response: state mismatch, [%d, %d]\n",
1389                                 dev->dev_state, dev->hbm_state);
1390                         return -EPROTO;
1391                 }
1392
1393                 dma_setup_res = (struct hbm_dma_setup_response *)mei_msg;
1394
1395                 if (dma_setup_res->status) {
1396                         u8 status = dma_setup_res->status;
1397
1398                         if (status == MEI_HBMS_NOT_ALLOWED) {
1399                                 dev_dbg(dev->dev, "hbm: dma setup not allowed\n");
1400                         } else {
1401                                 dev_info(dev->dev, "hbm: dma setup response: failure = %d %s\n",
1402                                          status,
1403                                          mei_hbm_status_str(status));
1404                         }
1405                         dev->hbm_f_dr_supported = 0;
1406                         mei_dmam_ring_free(dev);
1407                 }
1408
1409                 if (mei_hbm_enum_clients_req(dev))
1410                         return -EIO;
1411                 break;
1412
1413         case CLIENT_CONNECT_RES_CMD:
1414                 dev_dbg(dev->dev, "hbm: client connect response: message received.\n");
1415                 mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_CONNECT);
1416                 break;
1417
1418         case CLIENT_DISCONNECT_RES_CMD:
1419                 dev_dbg(dev->dev, "hbm: client disconnect response: message received.\n");
1420                 mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_DISCONNECT);
1421                 break;
1422
1423         case MEI_FLOW_CONTROL_CMD:
1424                 dev_dbg(dev->dev, "hbm: client flow control response: message received.\n");
1425
1426                 fctrl = (struct hbm_flow_control *)mei_msg;
1427                 mei_hbm_cl_tx_flow_ctrl_creds_res(dev, fctrl);
1428                 break;
1429
1430         case MEI_PG_ISOLATION_ENTRY_RES_CMD:
1431                 dev_dbg(dev->dev, "hbm: power gate isolation entry response received\n");
1432                 ret = mei_hbm_pg_enter_res(dev);
1433                 if (ret)
1434                         return ret;
1435                 break;
1436
1437         case MEI_PG_ISOLATION_EXIT_REQ_CMD:
1438                 dev_dbg(dev->dev, "hbm: power gate isolation exit request received\n");
1439                 ret = mei_hbm_pg_exit_res(dev);
1440                 if (ret)
1441                         return ret;
1442                 break;
1443
1444         case HOST_CLIENT_PROPERTIES_RES_CMD:
1445                 dev_dbg(dev->dev, "hbm: properties response: message received.\n");
1446
1447                 dev->init_clients_timer = 0;
1448
1449                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1450                     dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
1451                         if (dev->dev_state == MEI_DEV_POWER_DOWN) {
1452                                 dev_dbg(dev->dev, "hbm: properties response: on shutdown, ignoring\n");
1453                                 return 0;
1454                         }
1455                         dev_err(dev->dev, "hbm: properties response: state mismatch, [%d, %d]\n",
1456                                 dev->dev_state, dev->hbm_state);
1457                         return -EPROTO;
1458                 }
1459
1460                 props_res = (struct hbm_props_response *)mei_msg;
1461
1462                 if (props_res->status == MEI_HBMS_CLIENT_NOT_FOUND) {
1463                         dev_dbg(dev->dev, "hbm: properties response: %d CLIENT_NOT_FOUND\n",
1464                                 props_res->me_addr);
1465                 } else if (props_res->status) {
1466                         dev_err(dev->dev, "hbm: properties response: wrong status = %d %s\n",
1467                                 props_res->status,
1468                                 mei_hbm_status_str(props_res->status));
1469                         return -EPROTO;
1470                 } else {
1471                         mei_hbm_me_cl_add(dev, props_res);
1472                 }
1473
1474                 /* request property for the next client */
1475                 if (mei_hbm_prop_req(dev, props_res->me_addr + 1))
1476                         return -EIO;
1477
1478                 break;
1479
1480         case HOST_ENUM_RES_CMD:
1481                 dev_dbg(dev->dev, "hbm: enumeration response: message received\n");
1482
1483                 dev->init_clients_timer = 0;
1484
1485                 enum_res = (struct hbm_host_enum_response *) mei_msg;
1486                 BUILD_BUG_ON(sizeof(dev->me_clients_map)
1487                                 < sizeof(enum_res->valid_addresses));
1488                 memcpy(dev->me_clients_map, enum_res->valid_addresses,
1489                                 sizeof(enum_res->valid_addresses));
1490
1491                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1492                     dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
1493                         if (dev->dev_state == MEI_DEV_POWER_DOWN) {
1494                                 dev_dbg(dev->dev, "hbm: enumeration response: on shutdown, ignoring\n");
1495                                 return 0;
1496                         }
1497                         dev_err(dev->dev, "hbm: enumeration response: state mismatch, [%d, %d]\n",
1498                                 dev->dev_state, dev->hbm_state);
1499                         return -EPROTO;
1500                 }
1501
1502                 dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
1503
1504                 /* first property request */
1505                 if (mei_hbm_prop_req(dev, 0))
1506                         return -EIO;
1507
1508                 break;
1509
1510         case HOST_STOP_RES_CMD:
1511                 dev_dbg(dev->dev, "hbm: stop response: message received\n");
1512
1513                 dev->init_clients_timer = 0;
1514
1515                 if (dev->hbm_state != MEI_HBM_STOPPED) {
1516                         dev_err(dev->dev, "hbm: stop response: state mismatch, [%d, %d]\n",
1517                                 dev->dev_state, dev->hbm_state);
1518                         return -EPROTO;
1519                 }
1520
1521                 mei_set_devstate(dev, MEI_DEV_POWER_DOWN);
1522                 dev_info(dev->dev, "hbm: stop response: resetting.\n");
1523                 /* force the reset */
1524                 return -EPROTO;
1525
1526         case CLIENT_DISCONNECT_REQ_CMD:
1527                 dev_dbg(dev->dev, "hbm: disconnect request: message received\n");
1528
1529                 disconnect_req = (struct hbm_client_connect_request *)mei_msg;
1530                 mei_hbm_fw_disconnect_req(dev, disconnect_req);
1531                 break;
1532
1533         case ME_STOP_REQ_CMD:
1534                 dev_dbg(dev->dev, "hbm: stop request: message received\n");
1535                 dev->hbm_state = MEI_HBM_STOPPED;
1536                 if (mei_hbm_stop_req(dev)) {
1537                         dev_err(dev->dev, "hbm: stop request: failed to send stop request\n");
1538                         return -EIO;
1539                 }
1540                 break;
1541
1542         case MEI_HBM_ADD_CLIENT_REQ_CMD:
1543                 dev_dbg(dev->dev, "hbm: add client request received\n");
1544                 /*
1545                  * after the host receives the enum_resp
1546                  * message clients may be added or removed
1547                  */
1548                 if (dev->hbm_state <= MEI_HBM_ENUM_CLIENTS ||
1549                     dev->hbm_state >= MEI_HBM_STOPPED) {
1550                         dev_err(dev->dev, "hbm: add client: state mismatch, [%d, %d]\n",
1551                                 dev->dev_state, dev->hbm_state);
1552                         return -EPROTO;
1553                 }
1554                 add_cl_req = (struct hbm_add_client_request *)mei_msg;
1555                 ret = mei_hbm_fw_add_cl_req(dev, add_cl_req);
1556                 if (ret) {
1557                         dev_err(dev->dev, "hbm: add client: failed to send response %d\n",
1558                                 ret);
1559                         return -EIO;
1560                 }
1561                 dev_dbg(dev->dev, "hbm: add client request processed\n");
1562                 break;
1563
1564         case MEI_HBM_NOTIFY_RES_CMD:
1565                 dev_dbg(dev->dev, "hbm: notify response received\n");
1566                 mei_hbm_cl_res(dev, cl_cmd, notify_res_to_fop(cl_cmd));
1567                 break;
1568
1569         case MEI_HBM_NOTIFICATION_CMD:
1570                 dev_dbg(dev->dev, "hbm: notification\n");
1571                 mei_hbm_cl_notify(dev, cl_cmd);
1572                 break;
1573
1574         case MEI_HBM_CLIENT_DMA_MAP_RES_CMD:
1575                 dev_dbg(dev->dev, "hbm: client dma map response: message received.\n");
1576                 client_dma_res = (struct hbm_client_dma_response *)mei_msg;
1577                 mei_hbm_cl_dma_map_res(dev, client_dma_res);
1578                 break;
1579
1580         case MEI_HBM_CLIENT_DMA_UNMAP_RES_CMD:
1581                 dev_dbg(dev->dev, "hbm: client dma unmap response: message received.\n");
1582                 client_dma_res = (struct hbm_client_dma_response *)mei_msg;
1583                 mei_hbm_cl_dma_unmap_res(dev, client_dma_res);
1584                 break;
1585
1586         default:
1587                 WARN(1, "hbm: wrong command %d\n", mei_msg->hbm_cmd);
1588                 return -EPROTO;
1589
1590         }
1591         return 0;
1592 }
1593