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 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                         dev->timeouts.hbm);
 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 = dev->timeouts.client_init;
 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 = dev->timeouts.client_init;
 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
 344         if (dev->hbm_f_cd_supported)
 345                 req.capability_requested[0] |= HBM_CAP_CD;
 346
 347         if (dev->hbm_f_gsc_supported)
 348                 req.capability_requested[0] |= HBM_CAP_GSC;
 349
 350         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 351         if (ret) {
 352                 dev_err(dev->dev,
 353                         "capabilities request write failed: ret = %d.\n", ret);
 354                 return ret;
 355         }
 356
 357         dev->hbm_state = MEI_HBM_CAP_SETUP;
 358         dev->init_clients_timer = dev->timeouts.client_init;
 359         mei_schedule_stall_timer(dev);
 360         return 0;
 361 }
 362
 363 /**
 364  * mei_hbm_enum_clients_req - sends enumeration client request message.
 365  *
 366  * @dev: the device structure
 367  *
 368  * Return: 0 on success and < 0 on failure
 369  */
 370 static int mei_hbm_enum_clients_req(struct mei_device *dev)
 371 {
 372         struct mei_msg_hdr mei_hdr;
 373         struct hbm_host_enum_request req;
 374         int ret;
 375
 376         /* enumerate clients */
 377         mei_hbm_hdr(&mei_hdr, sizeof(req));
 378
 379         memset(&req, 0, sizeof(req));
 380         req.hbm_cmd = HOST_ENUM_REQ_CMD;
 381         req.flags |= dev->hbm_f_dc_supported ? MEI_HBM_ENUM_F_ALLOW_ADD : 0;
 382         req.flags |= dev->hbm_f_ie_supported ?
 383                           MEI_HBM_ENUM_F_IMMEDIATE_ENUM : 0;
 384
 385         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 386         if (ret) {
 387                 dev_err(dev->dev, "enumeration request write failed: ret = %d.\n",
 388                         ret);
 389                 return ret;
 390         }
 391         dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
 392         dev->init_clients_timer = dev->timeouts.client_init;
 393         mei_schedule_stall_timer(dev);
 394         return 0;
 395 }
 396
 397 /**
 398  * mei_hbm_me_cl_add - add new me client to the list
 399  *
 400  * @dev: the device structure
 401  * @res: hbm property response
 402  *
 403  * Return: 0 on success and -ENOMEM on allocation failure
 404  */
 405
 406 static int mei_hbm_me_cl_add(struct mei_device *dev,
 407                              struct hbm_props_response *res)
 408 {
 409         struct mei_me_client *me_cl;
 410         const uuid_le *uuid = &res->client_properties.protocol_name;
 411
 412         mei_me_cl_rm_by_uuid(dev, uuid);
 413
 414         me_cl = kzalloc(sizeof(*me_cl), GFP_KERNEL);
 415         if (!me_cl)
 416                 return -ENOMEM;
 417
 418         mei_me_cl_init(me_cl);
 419
 420         me_cl->props = res->client_properties;
 421         me_cl->client_id = res->me_addr;
 422         me_cl->tx_flow_ctrl_creds = 0;
 423
 424         mei_me_cl_add(dev, me_cl);
 425
 426         return 0;
 427 }
 428
 429 /**
 430  * mei_hbm_add_cl_resp - send response to fw on client add request
 431  *
 432  * @dev: the device structure
 433  * @addr: me address
 434  * @status: response status
 435  *
 436  * Return: 0 on success and < 0 on failure
 437  */
 438 static int mei_hbm_add_cl_resp(struct mei_device *dev, u8 addr, u8 status)
 439 {
 440         struct mei_msg_hdr mei_hdr;
 441         struct hbm_add_client_response resp;
 442         int ret;
 443
 444         dev_dbg(dev->dev, "adding client response\n");
 445
 446         mei_hbm_hdr(&mei_hdr, sizeof(resp));
 447
 448         memset(&resp, 0, sizeof(resp));
 449         resp.hbm_cmd = MEI_HBM_ADD_CLIENT_RES_CMD;
 450         resp.me_addr = addr;
 451         resp.status  = status;
 452
 453         ret = mei_hbm_write_message(dev, &mei_hdr, &resp);
 454         if (ret)
 455                 dev_err(dev->dev, "add client response write failed: ret = %d\n",
 456                         ret);
 457         return ret;
 458 }
 459
 460 /**
 461  * mei_hbm_fw_add_cl_req - request from the fw to add a client
 462  *
 463  * @dev: the device structure
 464  * @req: add client request
 465  *
 466  * Return: 0 on success and < 0 on failure
 467  */
 468 static int mei_hbm_fw_add_cl_req(struct mei_device *dev,
 469                               struct hbm_add_client_request *req)
 470 {
 471         int ret;
 472         u8 status = MEI_HBMS_SUCCESS;
 473
 474         BUILD_BUG_ON(sizeof(struct hbm_add_client_request) !=
 475                         sizeof(struct hbm_props_response));
 476
 477         ret = mei_hbm_me_cl_add(dev, (struct hbm_props_response *)req);
 478         if (ret)
 479                 status = !MEI_HBMS_SUCCESS;
 480
 481         if (dev->dev_state == MEI_DEV_ENABLED)
 482                 schedule_work(&dev->bus_rescan_work);
 483
 484         return mei_hbm_add_cl_resp(dev, req->me_addr, status);
 485 }
 486
 487 /**
 488  * mei_hbm_cl_notify_req - send notification request
 489  *
 490  * @dev: the device structure
 491  * @cl: a client to disconnect from
 492  * @start: true for start false for stop
 493  *
 494  * Return: 0 on success and -EIO on write failure
 495  */
 496 int mei_hbm_cl_notify_req(struct mei_device *dev,
 497                           struct mei_cl *cl, u8 start)
 498 {
 499
 500         struct mei_msg_hdr mei_hdr;
 501         struct hbm_notification_request req;
 502         int ret;
 503
 504         mei_hbm_hdr(&mei_hdr, sizeof(req));
 505         mei_hbm_cl_hdr(cl, MEI_HBM_NOTIFY_REQ_CMD, &req, sizeof(req));
 506
 507         req.start = start;
 508
 509         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 510         if (ret)
 511                 dev_err(dev->dev, "notify request failed: ret = %d\n", ret);
 512
 513         return ret;
 514 }
 515
 516 /**
 517  *  notify_res_to_fop - convert notification response to the proper
 518  *      notification FOP
 519  *
 520  * @cmd: client notification start response command
 521  *
 522  * Return:  MEI_FOP_NOTIFY_START or MEI_FOP_NOTIFY_STOP;
 523  */
 524 static inline enum mei_cb_file_ops notify_res_to_fop(struct mei_hbm_cl_cmd *cmd)
 525 {
 526         struct hbm_notification_response *rs =
 527                 (struct hbm_notification_response *)cmd;
 528
 529         return mei_cl_notify_req2fop(rs->start);
 530 }
 531
 532 /**
 533  * mei_hbm_cl_notify_start_res - update the client state according
 534  *       notify start response
 535  *
 536  * @dev: the device structure
 537  * @cl: mei host client
 538  * @cmd: client notification start response command
 539  */
 540 static void mei_hbm_cl_notify_start_res(struct mei_device *dev,
 541                                         struct mei_cl *cl,
 542                                         struct mei_hbm_cl_cmd *cmd)
 543 {
 544         struct hbm_notification_response *rs =
 545                 (struct hbm_notification_response *)cmd;
 546
 547         cl_dbg(dev, cl, "hbm: notify start response status=%d\n", rs->status);
 548
 549         if (rs->status == MEI_HBMS_SUCCESS ||
 550             rs->status == MEI_HBMS_ALREADY_STARTED) {
 551                 cl->notify_en = true;
 552                 cl->status = 0;
 553         } else {
 554                 cl->status = -EINVAL;
 555         }
 556 }
 557
 558 /**
 559  * mei_hbm_cl_notify_stop_res - update the client state according
 560  *       notify stop response
 561  *
 562  * @dev: the device structure
 563  * @cl: mei host client
 564  * @cmd: client notification stop response command
 565  */
 566 static void mei_hbm_cl_notify_stop_res(struct mei_device *dev,
 567                                        struct mei_cl *cl,
 568                                        struct mei_hbm_cl_cmd *cmd)
 569 {
 570         struct hbm_notification_response *rs =
 571                 (struct hbm_notification_response *)cmd;
 572
 573         cl_dbg(dev, cl, "hbm: notify stop response status=%d\n", rs->status);
 574
 575         if (rs->status == MEI_HBMS_SUCCESS ||
 576             rs->status == MEI_HBMS_NOT_STARTED) {
 577                 cl->notify_en = false;
 578                 cl->status = 0;
 579         } else {
 580                 /* TODO: spec is not clear yet about other possible issues */
 581                 cl->status = -EINVAL;
 582         }
 583 }
 584
 585 /**
 586  * mei_hbm_cl_notify - signal notification event
 587  *
 588  * @dev: the device structure
 589  * @cmd: notification client message
 590  */
 591 static void mei_hbm_cl_notify(struct mei_device *dev,
 592                               struct mei_hbm_cl_cmd *cmd)
 593 {
 594         struct mei_cl *cl;
 595
 596         cl = mei_hbm_cl_find_by_cmd(dev, cmd);
 597         if (cl)
 598                 mei_cl_notify(cl);
 599 }
 600
 601 /**
 602  * mei_hbm_cl_dma_map_req - send client dma map request
 603  *
 604  * @dev: the device structure
 605  * @cl: mei host client
 606  *
 607  * Return: 0 on success and -EIO on write failure
 608  */
 609 int mei_hbm_cl_dma_map_req(struct mei_device *dev, struct mei_cl *cl)
 610 {
 611         struct mei_msg_hdr mei_hdr;
 612         struct hbm_client_dma_map_request req;
 613         int ret;
 614
 615         mei_hbm_hdr(&mei_hdr, sizeof(req));
 616
 617         memset(&req, 0, sizeof(req));
 618
 619         req.hbm_cmd = MEI_HBM_CLIENT_DMA_MAP_REQ_CMD;
 620         req.client_buffer_id = cl->dma.buffer_id;
 621         req.address_lsb = lower_32_bits(cl->dma.daddr);
 622         req.address_msb = upper_32_bits(cl->dma.daddr);
 623         req.size = cl->dma.size;
 624
 625         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 626         if (ret)
 627                 dev_err(dev->dev, "dma map request failed: ret = %d\n", ret);
 628
 629         return ret;
 630 }
 631
 632 /**
 633  * mei_hbm_cl_dma_unmap_req - send client dma unmap request
 634  *
 635  * @dev: the device structure
 636  * @cl: mei host client
 637  *
 638  * Return: 0 on success and -EIO on write failure
 639  */
 640 int mei_hbm_cl_dma_unmap_req(struct mei_device *dev, struct mei_cl *cl)
 641 {
 642         struct mei_msg_hdr mei_hdr;
 643         struct hbm_client_dma_unmap_request req;
 644         int ret;
 645
 646         mei_hbm_hdr(&mei_hdr, sizeof(req));
 647
 648         memset(&req, 0, sizeof(req));
 649
 650         req.hbm_cmd = MEI_HBM_CLIENT_DMA_UNMAP_REQ_CMD;
 651         req.client_buffer_id = cl->dma.buffer_id;
 652
 653         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 654         if (ret)
 655                 dev_err(dev->dev, "dma unmap request failed: ret = %d\n", ret);
 656
 657         return ret;
 658 }
 659
 660 static void mei_hbm_cl_dma_map_res(struct mei_device *dev,
 661                                    struct hbm_client_dma_response *res)
 662 {
 663         struct mei_cl *cl;
 664         struct mei_cl_cb *cb, *next;
 665
 666         cl = NULL;
 667         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
 668                 if (cb->fop_type != MEI_FOP_DMA_MAP)
 669                         continue;
 670                 if (!cb->cl->dma.buffer_id || cb->cl->dma_mapped)
 671                         continue;
 672
 673                 cl = cb->cl;
 674                 break;
 675         }
 676         if (!cl)
 677                 return;
 678
 679         if (res->status) {
 680                 dev_err(dev->dev, "cl dma map failed %d\n", res->status);
 681                 cl->status = -EFAULT;
 682         } else {
 683                 dev_dbg(dev->dev, "cl dma map succeeded\n");
 684                 cl->dma_mapped = 1;
 685                 cl->status = 0;
 686         }
 687         wake_up(&cl->wait);
 688 }
 689
 690 static void mei_hbm_cl_dma_unmap_res(struct mei_device *dev,
 691                                      struct hbm_client_dma_response *res)
 692 {
 693         struct mei_cl *cl;
 694         struct mei_cl_cb *cb, *next;
 695
 696         cl = NULL;
 697         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
 698                 if (cb->fop_type != MEI_FOP_DMA_UNMAP)
 699                         continue;
 700                 if (!cb->cl->dma.buffer_id || !cb->cl->dma_mapped)
 701                         continue;
 702
 703                 cl = cb->cl;
 704                 break;
 705         }
 706         if (!cl)
 707                 return;
 708
 709         if (res->status) {
 710                 dev_err(dev->dev, "cl dma unmap failed %d\n", res->status);
 711                 cl->status = -EFAULT;
 712         } else {
 713                 dev_dbg(dev->dev, "cl dma unmap succeeded\n");
 714                 cl->dma_mapped = 0;
 715                 cl->status = 0;
 716         }
 717         wake_up(&cl->wait);
 718 }
 719
 720 /**
 721  * mei_hbm_prop_req - request property for a single client
 722  *
 723  * @dev: the device structure
 724  * @start_idx: client index to start search
 725  *
 726  * Return: 0 on success and < 0 on failure
 727  */
 728 static int mei_hbm_prop_req(struct mei_device *dev, unsigned long start_idx)
 729 {
 730         struct mei_msg_hdr mei_hdr;
 731         struct hbm_props_request req;
 732         unsigned long addr;
 733         int ret;
 734
 735         addr = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, start_idx);
 736
 737         /* We got all client properties */
 738         if (addr == MEI_CLIENTS_MAX) {
 739                 dev->hbm_state = MEI_HBM_STARTED;
 740                 mei_host_client_init(dev);
 741                 return 0;
 742         }
 743
 744         mei_hbm_hdr(&mei_hdr, sizeof(req));
 745
 746         memset(&req, 0, sizeof(req));
 747
 748         req.hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
 749         req.me_addr = addr;
 750
 751         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 752         if (ret) {
 753                 dev_err(dev->dev, "properties request write failed: ret = %d\n",
 754                         ret);
 755                 return ret;
 756         }
 757
 758         dev->init_clients_timer = dev->timeouts.client_init;
 759         mei_schedule_stall_timer(dev);
 760
 761         return 0;
 762 }
 763
 764 /**
 765  * mei_hbm_pg - sends pg command
 766  *
 767  * @dev: the device structure
 768  * @pg_cmd: the pg command code
 769  *
 770  * Return: -EIO on write failure
 771  *         -EOPNOTSUPP if the operation is not supported by the protocol
 772  */
 773 int mei_hbm_pg(struct mei_device *dev, u8 pg_cmd)
 774 {
 775         struct mei_msg_hdr mei_hdr;
 776         struct hbm_power_gate req;
 777         int ret;
 778
 779         if (!dev->hbm_f_pg_supported)
 780                 return -EOPNOTSUPP;
 781
 782         mei_hbm_hdr(&mei_hdr, sizeof(req));
 783
 784         memset(&req, 0, sizeof(req));
 785         req.hbm_cmd = pg_cmd;
 786
 787         ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 788         if (ret)
 789                 dev_err(dev->dev, "power gate command write failed.\n");
 790         return ret;
 791 }
 792 EXPORT_SYMBOL_GPL(mei_hbm_pg);
 793
 794 /**
 795  * mei_hbm_stop_req - send stop request message
 796  *
 797  * @dev: mei device
 798  *
 799  * Return: -EIO on write failure
 800  */
 801 static int mei_hbm_stop_req(struct mei_device *dev)
 802 {
 803         struct mei_msg_hdr mei_hdr;
 804         struct hbm_host_stop_request req;
 805
 806         mei_hbm_hdr(&mei_hdr, sizeof(req));
 807
 808         memset(&req, 0, sizeof(req));
 809         req.hbm_cmd = HOST_STOP_REQ_CMD;
 810         req.reason = DRIVER_STOP_REQUEST;
 811
 812         return mei_hbm_write_message(dev, &mei_hdr, &req);
 813 }
 814
 815 /**
 816  * mei_hbm_cl_flow_control_req - sends flow control request.
 817  *
 818  * @dev: the device structure
 819  * @cl: client info
 820  *
 821  * Return: -EIO on write failure
 822  */
 823 int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
 824 {
 825         struct hbm_flow_control req;
 826
 827         cl_dbg(dev, cl, "sending flow control\n");
 828         return mei_hbm_cl_write(dev, cl, MEI_FLOW_CONTROL_CMD,
 829                                 &req, sizeof(req));
 830 }
 831
 832 /**
 833  * mei_hbm_add_single_tx_flow_ctrl_creds - adds single buffer credentials.
 834  *
 835  * @dev: the device structure
 836  * @fctrl: flow control response bus message
 837  *
 838  * Return: 0 on success, < 0 otherwise
 839  */
 840 static int mei_hbm_add_single_tx_flow_ctrl_creds(struct mei_device *dev,
 841                                                  struct hbm_flow_control *fctrl)
 842 {
 843         struct mei_me_client *me_cl;
 844         int rets;
 845
 846         me_cl = mei_me_cl_by_id(dev, fctrl->me_addr);
 847         if (!me_cl) {
 848                 dev_err(dev->dev, "no such me client %d\n", fctrl->me_addr);
 849                 return -ENOENT;
 850         }
 851
 852         if (WARN_ON(me_cl->props.single_recv_buf == 0)) {
 853                 rets = -EINVAL;
 854                 goto out;
 855         }
 856
 857         me_cl->tx_flow_ctrl_creds++;
 858         dev_dbg(dev->dev, "recv flow ctrl msg ME %d (single) creds = %d.\n",
 859                 fctrl->me_addr, me_cl->tx_flow_ctrl_creds);
 860
 861         rets = 0;
 862 out:
 863         mei_me_cl_put(me_cl);
 864         return rets;
 865 }
 866
 867 /**
 868  * mei_hbm_cl_tx_flow_ctrl_creds_res - flow control response from me
 869  *
 870  * @dev: the device structure
 871  * @fctrl: flow control response bus message
 872  */
 873 static void mei_hbm_cl_tx_flow_ctrl_creds_res(struct mei_device *dev,
 874                                                struct hbm_flow_control *fctrl)
 875 {
 876         struct mei_cl *cl;
 877
 878         if (!fctrl->host_addr) {
 879                 /* single receive buffer */
 880                 mei_hbm_add_single_tx_flow_ctrl_creds(dev, fctrl);
 881                 return;
 882         }
 883
 884         cl = mei_hbm_cl_find_by_cmd(dev, fctrl);
 885         if (cl) {
 886                 cl->tx_flow_ctrl_creds++;
 887                 cl_dbg(dev, cl, "flow control creds = %d.\n",
 888                                 cl->tx_flow_ctrl_creds);
 889         }
 890 }
 891
 892
 893 /**
 894  * mei_hbm_cl_disconnect_req - sends disconnect message to fw.
 895  *
 896  * @dev: the device structure
 897  * @cl: a client to disconnect from
 898  *
 899  * Return: -EIO on write failure
 900  */
 901 int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
 902 {
 903         struct hbm_client_connect_request req;
 904
 905         return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_REQ_CMD,
 906                                 &req, sizeof(req));
 907 }
 908
 909 /**
 910  * mei_hbm_cl_disconnect_rsp - sends disconnect respose to the FW
 911  *
 912  * @dev: the device structure
 913  * @cl: a client to disconnect from
 914  *
 915  * Return: -EIO on write failure
 916  */
 917 int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
 918 {
 919         struct hbm_client_connect_response resp;
 920
 921         return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_RES_CMD,
 922                                 &resp, sizeof(resp));
 923 }
 924
 925 /**
 926  * mei_hbm_cl_disconnect_res - update the client state according
 927  *       disconnect response
 928  *
 929  * @dev: the device structure
 930  * @cl: mei host client
 931  * @cmd: disconnect client response host bus message
 932  */
 933 static void mei_hbm_cl_disconnect_res(struct mei_device *dev, struct mei_cl *cl,
 934                                       struct mei_hbm_cl_cmd *cmd)
 935 {
 936         struct hbm_client_connect_response *rs =
 937                 (struct hbm_client_connect_response *)cmd;
 938
 939         cl_dbg(dev, cl, "hbm: disconnect response status=%d\n", rs->status);
 940
 941         if (rs->status == MEI_CL_DISCONN_SUCCESS)
 942                 cl->state = MEI_FILE_DISCONNECT_REPLY;
 943         cl->status = 0;
 944 }
 945
 946 /**
 947  * mei_hbm_cl_connect_req - send connection request to specific me client
 948  *
 949  * @dev: the device structure
 950  * @cl: a client to connect to
 951  *
 952  * Return: -EIO on write failure
 953  */
 954 int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
 955 {
 956         struct hbm_client_connect_request req;
 957
 958         return mei_hbm_cl_write(dev, cl, CLIENT_CONNECT_REQ_CMD,
 959                                 &req, sizeof(req));
 960 }
 961
 962 /**
 963  * mei_hbm_cl_connect_res - update the client state according
 964  *        connection response
 965  *
 966  * @dev: the device structure
 967  * @cl: mei host client
 968  * @cmd: connect client response host bus message
 969  */
 970 static void mei_hbm_cl_connect_res(struct mei_device *dev, struct mei_cl *cl,
 971                                    struct mei_hbm_cl_cmd *cmd)
 972 {
 973         struct hbm_client_connect_response *rs =
 974                 (struct hbm_client_connect_response *)cmd;
 975
 976         cl_dbg(dev, cl, "hbm: connect response status=%s\n",
 977                         mei_cl_conn_status_str(rs->status));
 978
 979         if (rs->status == MEI_CL_CONN_SUCCESS)
 980                 cl->state = MEI_FILE_CONNECTED;
 981         else {
 982                 cl->state = MEI_FILE_DISCONNECT_REPLY;
 983                 if (rs->status == MEI_CL_CONN_NOT_FOUND) {
 984                         mei_me_cl_del(dev, cl->me_cl);
 985                         if (dev->dev_state == MEI_DEV_ENABLED)
 986                                 schedule_work(&dev->bus_rescan_work);
 987                 }
 988         }
 989         cl->status = mei_cl_conn_status_to_errno(rs->status);
 990 }
 991
 992 /**
 993  * mei_hbm_cl_res - process hbm response received on behalf
 994  *         an client
 995  *
 996  * @dev: the device structure
 997  * @rs:  hbm client message
 998  * @fop_type: file operation type
 999  */
1000 static void mei_hbm_cl_res(struct mei_device *dev,
1001                            struct mei_hbm_cl_cmd *rs,
1002                            enum mei_cb_file_ops fop_type)
1003 {
1004         struct mei_cl *cl;
1005         struct mei_cl_cb *cb, *next;
1006
1007         cl = NULL;
1008         list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
1009
1010                 cl = cb->cl;
1011
1012                 if (cb->fop_type != fop_type)
1013                         continue;
1014
1015                 if (mei_hbm_cl_addr_equal(cl, rs)) {
1016                         list_del_init(&cb->list);
1017                         break;
1018                 }
1019         }
1020
1021         if (!cl)
1022                 return;
1023
1024         switch (fop_type) {
1025         case MEI_FOP_CONNECT:
1026                 mei_hbm_cl_connect_res(dev, cl, rs);
1027                 break;
1028         case MEI_FOP_DISCONNECT:
1029                 mei_hbm_cl_disconnect_res(dev, cl, rs);
1030                 break;
1031         case MEI_FOP_NOTIFY_START:
1032                 mei_hbm_cl_notify_start_res(dev, cl, rs);
1033                 break;
1034         case MEI_FOP_NOTIFY_STOP:
1035                 mei_hbm_cl_notify_stop_res(dev, cl, rs);
1036                 break;
1037         default:
1038                 return;
1039         }
1040
1041         cl->timer_count = 0;
1042         wake_up(&cl->wait);
1043 }
1044
1045
1046 /**
1047  * mei_hbm_fw_disconnect_req - disconnect request initiated by ME firmware
1048  *  host sends disconnect response
1049  *
1050  * @dev: the device structure.
1051  * @disconnect_req: disconnect request bus message from the me
1052  *
1053  * Return: -ENOMEM on allocation failure
1054  */
1055 static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
1056                 struct hbm_client_connect_request *disconnect_req)
1057 {
1058         struct mei_cl *cl;
1059         struct mei_cl_cb *cb;
1060
1061         cl = mei_hbm_cl_find_by_cmd(dev, disconnect_req);
1062         if (cl) {
1063                 cl_warn(dev, cl, "fw disconnect request received\n");
1064                 cl->state = MEI_FILE_DISCONNECTING;
1065                 cl->timer_count = 0;
1066
1067                 cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DISCONNECT_RSP,
1068                                                NULL);
1069                 if (!cb)
1070                         return -ENOMEM;
1071         }
1072         return 0;
1073 }
1074
1075 /**
1076  * mei_hbm_pg_enter_res - PG enter response received
1077  *
1078  * @dev: the device structure.
1079  *
1080  * Return: 0 on success, -EPROTO on state mismatch
1081  */
1082 static int mei_hbm_pg_enter_res(struct mei_device *dev)
1083 {
1084         if (mei_pg_state(dev) != MEI_PG_OFF ||
1085             dev->pg_event != MEI_PG_EVENT_WAIT) {
1086                 dev_err(dev->dev, "hbm: pg entry response: state mismatch [%s, %d]\n",
1087                         mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
1088                 return -EPROTO;
1089         }
1090
1091         dev->pg_event = MEI_PG_EVENT_RECEIVED;
1092         wake_up(&dev->wait_pg);
1093
1094         return 0;
1095 }
1096
1097 /**
1098  * mei_hbm_pg_resume - process with PG resume
1099  *
1100  * @dev: the device structure.
1101  */
1102 void mei_hbm_pg_resume(struct mei_device *dev)
1103 {
1104         pm_request_resume(dev->dev);
1105 }
1106 EXPORT_SYMBOL_GPL(mei_hbm_pg_resume);
1107
1108 /**
1109  * mei_hbm_pg_exit_res - PG exit response received
1110  *
1111  * @dev: the device structure.
1112  *
1113  * Return: 0 on success, -EPROTO on state mismatch
1114  */
1115 static int mei_hbm_pg_exit_res(struct mei_device *dev)
1116 {
1117         if (mei_pg_state(dev) != MEI_PG_ON ||
1118             (dev->pg_event != MEI_PG_EVENT_WAIT &&
1119              dev->pg_event != MEI_PG_EVENT_IDLE)) {
1120                 dev_err(dev->dev, "hbm: pg exit response: state mismatch [%s, %d]\n",
1121                         mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
1122                 return -EPROTO;
1123         }
1124
1125         switch (dev->pg_event) {
1126         case MEI_PG_EVENT_WAIT:
1127                 dev->pg_event = MEI_PG_EVENT_RECEIVED;
1128                 wake_up(&dev->wait_pg);
1129                 break;
1130         case MEI_PG_EVENT_IDLE:
1131                 /*
1132                 * If the driver is not waiting on this then
1133                 * this is HW initiated exit from PG.
1134                 * Start runtime pm resume sequence to exit from PG.
1135                 */
1136                 dev->pg_event = MEI_PG_EVENT_RECEIVED;
1137                 mei_hbm_pg_resume(dev);
1138                 break;
1139         default:
1140                 WARN(1, "hbm: pg exit response: unexpected pg event = %d\n",
1141                      dev->pg_event);
1142                 return -EPROTO;
1143         }
1144
1145         return 0;
1146 }
1147
1148 /**
1149  * mei_hbm_config_features - check what hbm features and commands
1150  *        are supported by the fw
1151  *
1152  * @dev: the device structure
1153  */
1154 static void mei_hbm_config_features(struct mei_device *dev)
1155 {
1156         /* Power Gating Isolation Support */
1157         dev->hbm_f_pg_supported = 0;
1158         if (dev->version.major_version > HBM_MAJOR_VERSION_PGI)
1159                 dev->hbm_f_pg_supported = 1;
1160
1161         if (dev->version.major_version == HBM_MAJOR_VERSION_PGI &&
1162             dev->version.minor_version >= HBM_MINOR_VERSION_PGI)
1163                 dev->hbm_f_pg_supported = 1;
1164
1165         dev->hbm_f_dc_supported = 0;
1166         if (dev->version.major_version >= HBM_MAJOR_VERSION_DC)
1167                 dev->hbm_f_dc_supported = 1;
1168
1169         dev->hbm_f_ie_supported = 0;
1170         if (dev->version.major_version >= HBM_MAJOR_VERSION_IE)
1171                 dev->hbm_f_ie_supported = 1;
1172
1173         /* disconnect on connect timeout instead of link reset */
1174         dev->hbm_f_dot_supported = 0;
1175         if (dev->version.major_version >= HBM_MAJOR_VERSION_DOT)
1176                 dev->hbm_f_dot_supported = 1;
1177
1178         /* Notification Event Support */
1179         dev->hbm_f_ev_supported = 0;
1180         if (dev->version.major_version >= HBM_MAJOR_VERSION_EV)
1181                 dev->hbm_f_ev_supported = 1;
1182
1183         /* Fixed Address Client Support */
1184         dev->hbm_f_fa_supported = 0;
1185         if (dev->version.major_version >= HBM_MAJOR_VERSION_FA)
1186                 dev->hbm_f_fa_supported = 1;
1187
1188         /* OS ver message Support */
1189         dev->hbm_f_os_supported = 0;
1190         if (dev->version.major_version >= HBM_MAJOR_VERSION_OS)
1191                 dev->hbm_f_os_supported = 1;
1192
1193         /* DMA Ring Support */
1194         dev->hbm_f_dr_supported = 0;
1195         if (dev->version.major_version > HBM_MAJOR_VERSION_DR ||
1196             (dev->version.major_version == HBM_MAJOR_VERSION_DR &&
1197              dev->version.minor_version >= HBM_MINOR_VERSION_DR))
1198                 dev->hbm_f_dr_supported = 1;
1199
1200         /* VTag Support */
1201         dev->hbm_f_vt_supported = 0;
1202         if (dev->version.major_version > HBM_MAJOR_VERSION_VT ||
1203             (dev->version.major_version == HBM_MAJOR_VERSION_VT &&
1204              dev->version.minor_version >= HBM_MINOR_VERSION_VT))
1205                 dev->hbm_f_vt_supported = 1;
1206
1207         /* GSC support */
1208         if (dev->version.major_version > HBM_MAJOR_VERSION_GSC ||
1209             (dev->version.major_version == HBM_MAJOR_VERSION_GSC &&
1210              dev->version.minor_version >= HBM_MINOR_VERSION_GSC))
1211                 dev->hbm_f_gsc_supported = 1;
1212
1213         /* Capability message Support */
1214         dev->hbm_f_cap_supported = 0;
1215         if (dev->version.major_version > HBM_MAJOR_VERSION_CAP ||
1216             (dev->version.major_version == HBM_MAJOR_VERSION_CAP &&
1217              dev->version.minor_version >= HBM_MINOR_VERSION_CAP))
1218                 dev->hbm_f_cap_supported = 1;
1219
1220         /* Client DMA Support */
1221         dev->hbm_f_cd_supported = 0;
1222         if (dev->version.major_version > HBM_MAJOR_VERSION_CD ||
1223             (dev->version.major_version == HBM_MAJOR_VERSION_CD &&
1224              dev->version.minor_version >= HBM_MINOR_VERSION_CD))
1225                 dev->hbm_f_cd_supported = 1;
1226 }
1227
1228 /**
1229  * mei_hbm_version_is_supported - checks whether the driver can
1230  *     support the hbm version of the device
1231  *
1232  * @dev: the device structure
1233  * Return: true if driver can support hbm version of the device
1234  */
1235 bool mei_hbm_version_is_supported(struct mei_device *dev)
1236 {
1237         return  (dev->version.major_version < HBM_MAJOR_VERSION) ||
1238                 (dev->version.major_version == HBM_MAJOR_VERSION &&
1239                  dev->version.minor_version <= HBM_MINOR_VERSION);
1240 }
1241
1242 /**
1243  * mei_hbm_dispatch - bottom half read routine after ISR to
1244  * handle the read bus message cmd processing.
1245  *
1246  * @dev: the device structure
1247  * @hdr: header of bus message
1248  *
1249  * Return: 0 on success and < 0 on failure
1250  */
1251 int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
1252 {
1253         struct mei_bus_message *mei_msg;
1254         struct hbm_host_version_response *version_res;
1255         struct hbm_props_response *props_res;
1256         struct hbm_host_enum_response *enum_res;
1257         struct hbm_dma_setup_response *dma_setup_res;
1258         struct hbm_add_client_request *add_cl_req;
1259         struct hbm_capability_response *capability_res;
1260         int ret;
1261
1262         struct mei_hbm_cl_cmd *cl_cmd;
1263         struct hbm_client_connect_request *disconnect_req;
1264         struct hbm_flow_control *fctrl;
1265         struct hbm_client_dma_response *client_dma_res;
1266
1267         /* read the message to our buffer */
1268         BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
1269         mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
1270         mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
1271         cl_cmd  = (struct mei_hbm_cl_cmd *)mei_msg;
1272
1273         /* ignore spurious message and prevent reset nesting
1274          * hbm is put to idle during system reset
1275          */
1276         if (dev->hbm_state == MEI_HBM_IDLE) {
1277                 dev_dbg(dev->dev, "hbm: state is idle ignore spurious messages\n");
1278                 return 0;
1279         }
1280
1281         switch (mei_msg->hbm_cmd) {
1282         case HOST_START_RES_CMD:
1283                 dev_dbg(dev->dev, "hbm: start: response message received.\n");
1284
1285                 dev->init_clients_timer = 0;
1286
1287                 version_res = (struct hbm_host_version_response *)mei_msg;
1288
1289                 dev_dbg(dev->dev, "HBM VERSION: DRIVER=%02d:%02d DEVICE=%02d:%02d\n",
1290                                 HBM_MAJOR_VERSION, HBM_MINOR_VERSION,
1291                                 version_res->me_max_version.major_version,
1292                                 version_res->me_max_version.minor_version);
1293
1294                 if (version_res->host_version_supported) {
1295                         dev->version.major_version = HBM_MAJOR_VERSION;
1296                         dev->version.minor_version = HBM_MINOR_VERSION;
1297                 } else {
1298                         dev->version.major_version =
1299                                 version_res->me_max_version.major_version;
1300                         dev->version.minor_version =
1301                                 version_res->me_max_version.minor_version;
1302                 }
1303
1304                 if (!mei_hbm_version_is_supported(dev)) {
1305                         dev_warn(dev->dev, "hbm: start: version mismatch - stopping the driver.\n");
1306
1307                         dev->hbm_state = MEI_HBM_STOPPED;
1308                         if (mei_hbm_stop_req(dev)) {
1309                                 dev_err(dev->dev, "hbm: start: failed to send stop request\n");
1310                                 return -EIO;
1311                         }
1312                         break;
1313                 }
1314
1315                 mei_hbm_config_features(dev);
1316
1317                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1318                     dev->hbm_state != MEI_HBM_STARTING) {
1319                         if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1320                             dev->dev_state == MEI_DEV_POWERING_DOWN) {
1321                                 dev_dbg(dev->dev, "hbm: start: on shutdown, ignoring\n");
1322                                 return 0;
1323                         }
1324                         dev_err(dev->dev, "hbm: start: state mismatch, [%d, %d]\n",
1325                                 dev->dev_state, dev->hbm_state);
1326                         return -EPROTO;
1327                 }
1328
1329                 if (dev->hbm_f_cap_supported) {
1330                         if (mei_hbm_capabilities_req(dev))
1331                                 return -EIO;
1332                         wake_up(&dev->wait_hbm_start);
1333                         break;
1334                 }
1335
1336                 if (dev->hbm_f_dr_supported) {
1337                         if (mei_dmam_ring_alloc(dev))
1338                                 dev_info(dev->dev, "running w/o dma ring\n");
1339                         if (mei_dma_ring_is_allocated(dev)) {
1340                                 if (mei_hbm_dma_setup_req(dev))
1341                                         return -EIO;
1342
1343                                 wake_up(&dev->wait_hbm_start);
1344                                 break;
1345                         }
1346                 }
1347
1348                 dev->hbm_f_dr_supported = 0;
1349                 mei_dmam_ring_free(dev);
1350
1351                 if (mei_hbm_enum_clients_req(dev))
1352                         return -EIO;
1353
1354                 wake_up(&dev->wait_hbm_start);
1355                 break;
1356
1357         case MEI_HBM_CAPABILITIES_RES_CMD:
1358                 dev_dbg(dev->dev, "hbm: capabilities response: message received.\n");
1359
1360                 dev->init_clients_timer = 0;
1361
1362                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1363                     dev->hbm_state != MEI_HBM_CAP_SETUP) {
1364                         if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1365                             dev->dev_state == MEI_DEV_POWERING_DOWN) {
1366                                 dev_dbg(dev->dev, "hbm: capabilities response: on shutdown, ignoring\n");
1367                                 return 0;
1368                         }
1369                         dev_err(dev->dev, "hbm: capabilities response: state mismatch, [%d, %d]\n",
1370                                 dev->dev_state, dev->hbm_state);
1371                         return -EPROTO;
1372                 }
1373
1374                 capability_res = (struct hbm_capability_response *)mei_msg;
1375                 if (!(capability_res->capability_granted[0] & HBM_CAP_VT))
1376                         dev->hbm_f_vt_supported = 0;
1377                 if (!(capability_res->capability_granted[0] & HBM_CAP_CD))
1378                         dev->hbm_f_cd_supported = 0;
1379
1380                 if (!(capability_res->capability_granted[0] & HBM_CAP_GSC))
1381                         dev->hbm_f_gsc_supported = 0;
1382
1383                 if (dev->hbm_f_dr_supported) {
1384                         if (mei_dmam_ring_alloc(dev))
1385                                 dev_info(dev->dev, "running w/o dma ring\n");
1386                         if (mei_dma_ring_is_allocated(dev)) {
1387                                 if (mei_hbm_dma_setup_req(dev))
1388                                         return -EIO;
1389                                 break;
1390                         }
1391                 }
1392
1393                 dev->hbm_f_dr_supported = 0;
1394                 mei_dmam_ring_free(dev);
1395
1396                 if (mei_hbm_enum_clients_req(dev))
1397                         return -EIO;
1398                 break;
1399
1400         case MEI_HBM_DMA_SETUP_RES_CMD:
1401                 dev_dbg(dev->dev, "hbm: dma setup response: message received.\n");
1402
1403                 dev->init_clients_timer = 0;
1404
1405                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1406                     dev->hbm_state != MEI_HBM_DR_SETUP) {
1407                         if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1408                             dev->dev_state == MEI_DEV_POWERING_DOWN) {
1409                                 dev_dbg(dev->dev, "hbm: dma setup response: on shutdown, ignoring\n");
1410                                 return 0;
1411                         }
1412                         dev_err(dev->dev, "hbm: dma setup response: state mismatch, [%d, %d]\n",
1413                                 dev->dev_state, dev->hbm_state);
1414                         return -EPROTO;
1415                 }
1416
1417                 dma_setup_res = (struct hbm_dma_setup_response *)mei_msg;
1418
1419                 if (dma_setup_res->status) {
1420                         u8 status = dma_setup_res->status;
1421
1422                         if (status == MEI_HBMS_NOT_ALLOWED) {
1423                                 dev_dbg(dev->dev, "hbm: dma setup not allowed\n");
1424                         } else {
1425                                 dev_info(dev->dev, "hbm: dma setup response: failure = %d %s\n",
1426                                          status,
1427                                          mei_hbm_status_str(status));
1428                         }
1429                         dev->hbm_f_dr_supported = 0;
1430                         mei_dmam_ring_free(dev);
1431                 }
1432
1433                 if (mei_hbm_enum_clients_req(dev))
1434                         return -EIO;
1435                 break;
1436
1437         case CLIENT_CONNECT_RES_CMD:
1438                 dev_dbg(dev->dev, "hbm: client connect response: message received.\n");
1439                 mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_CONNECT);
1440                 break;
1441
1442         case CLIENT_DISCONNECT_RES_CMD:
1443                 dev_dbg(dev->dev, "hbm: client disconnect response: message received.\n");
1444                 mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_DISCONNECT);
1445                 break;
1446
1447         case MEI_FLOW_CONTROL_CMD:
1448                 dev_dbg(dev->dev, "hbm: client flow control response: message received.\n");
1449
1450                 fctrl = (struct hbm_flow_control *)mei_msg;
1451                 mei_hbm_cl_tx_flow_ctrl_creds_res(dev, fctrl);
1452                 break;
1453
1454         case MEI_PG_ISOLATION_ENTRY_RES_CMD:
1455                 dev_dbg(dev->dev, "hbm: power gate isolation entry response received\n");
1456                 ret = mei_hbm_pg_enter_res(dev);
1457                 if (ret)
1458                         return ret;
1459                 break;
1460
1461         case MEI_PG_ISOLATION_EXIT_REQ_CMD:
1462                 dev_dbg(dev->dev, "hbm: power gate isolation exit request received\n");
1463                 ret = mei_hbm_pg_exit_res(dev);
1464                 if (ret)
1465                         return ret;
1466                 break;
1467
1468         case HOST_CLIENT_PROPERTIES_RES_CMD:
1469                 dev_dbg(dev->dev, "hbm: properties response: message received.\n");
1470
1471                 dev->init_clients_timer = 0;
1472
1473                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1474                     dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
1475                         if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1476                             dev->dev_state == MEI_DEV_POWERING_DOWN) {
1477                                 dev_dbg(dev->dev, "hbm: properties response: on shutdown, ignoring\n");
1478                                 return 0;
1479                         }
1480                         dev_err(dev->dev, "hbm: properties response: state mismatch, [%d, %d]\n",
1481                                 dev->dev_state, dev->hbm_state);
1482                         return -EPROTO;
1483                 }
1484
1485                 props_res = (struct hbm_props_response *)mei_msg;
1486
1487                 if (props_res->status == MEI_HBMS_CLIENT_NOT_FOUND) {
1488                         dev_dbg(dev->dev, "hbm: properties response: %d CLIENT_NOT_FOUND\n",
1489                                 props_res->me_addr);
1490                 } else if (props_res->status) {
1491                         dev_err(dev->dev, "hbm: properties response: wrong status = %d %s\n",
1492                                 props_res->status,
1493                                 mei_hbm_status_str(props_res->status));
1494                         return -EPROTO;
1495                 } else {
1496                         mei_hbm_me_cl_add(dev, props_res);
1497                 }
1498
1499                 /* request property for the next client */
1500                 if (mei_hbm_prop_req(dev, props_res->me_addr + 1))
1501                         return -EIO;
1502
1503                 break;
1504
1505         case HOST_ENUM_RES_CMD:
1506                 dev_dbg(dev->dev, "hbm: enumeration response: message received\n");
1507
1508                 dev->init_clients_timer = 0;
1509
1510                 enum_res = (struct hbm_host_enum_response *) mei_msg;
1511                 BUILD_BUG_ON(sizeof(dev->me_clients_map)
1512                                 < sizeof(enum_res->valid_addresses));
1513                 memcpy(dev->me_clients_map, enum_res->valid_addresses,
1514                                 sizeof(enum_res->valid_addresses));
1515
1516                 if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1517                     dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
1518                         if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1519                             dev->dev_state == MEI_DEV_POWERING_DOWN) {
1520                                 dev_dbg(dev->dev, "hbm: enumeration response: on shutdown, ignoring\n");
1521                                 return 0;
1522                         }
1523                         dev_err(dev->dev, "hbm: enumeration response: state mismatch, [%d, %d]\n",
1524                                 dev->dev_state, dev->hbm_state);
1525                         return -EPROTO;
1526                 }
1527
1528                 dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
1529
1530                 /* first property request */
1531                 if (mei_hbm_prop_req(dev, 0))
1532                         return -EIO;
1533
1534                 break;
1535
1536         case HOST_STOP_RES_CMD:
1537                 dev_dbg(dev->dev, "hbm: stop response: message received\n");
1538
1539                 dev->init_clients_timer = 0;
1540
1541                 if (dev->hbm_state != MEI_HBM_STOPPED) {
1542                         dev_err(dev->dev, "hbm: stop response: state mismatch, [%d, %d]\n",
1543                                 dev->dev_state, dev->hbm_state);
1544                         return -EPROTO;
1545                 }
1546
1547                 mei_set_devstate(dev, MEI_DEV_POWER_DOWN);
1548                 dev_info(dev->dev, "hbm: stop response: resetting.\n");
1549                 /* force the reset */
1550                 return -EPROTO;
1551
1552         case CLIENT_DISCONNECT_REQ_CMD:
1553                 dev_dbg(dev->dev, "hbm: disconnect request: message received\n");
1554
1555                 disconnect_req = (struct hbm_client_connect_request *)mei_msg;
1556                 mei_hbm_fw_disconnect_req(dev, disconnect_req);
1557                 break;
1558
1559         case ME_STOP_REQ_CMD:
1560                 dev_dbg(dev->dev, "hbm: stop request: message received\n");
1561                 dev->hbm_state = MEI_HBM_STOPPED;
1562                 if (mei_hbm_stop_req(dev)) {
1563                         dev_err(dev->dev, "hbm: stop request: failed to send stop request\n");
1564                         return -EIO;
1565                 }
1566                 break;
1567
1568         case MEI_HBM_ADD_CLIENT_REQ_CMD:
1569                 dev_dbg(dev->dev, "hbm: add client request received\n");
1570                 /*
1571                  * after the host receives the enum_resp
1572                  * message clients may be added or removed
1573                  */
1574                 if (dev->hbm_state <= MEI_HBM_ENUM_CLIENTS ||
1575                     dev->hbm_state >= MEI_HBM_STOPPED) {
1576                         dev_err(dev->dev, "hbm: add client: state mismatch, [%d, %d]\n",
1577                                 dev->dev_state, dev->hbm_state);
1578                         return -EPROTO;
1579                 }
1580                 add_cl_req = (struct hbm_add_client_request *)mei_msg;
1581                 ret = mei_hbm_fw_add_cl_req(dev, add_cl_req);
1582                 if (ret) {
1583                         dev_err(dev->dev, "hbm: add client: failed to send response %d\n",
1584                                 ret);
1585                         return -EIO;
1586                 }
1587                 dev_dbg(dev->dev, "hbm: add client request processed\n");
1588                 break;
1589
1590         case MEI_HBM_NOTIFY_RES_CMD:
1591                 dev_dbg(dev->dev, "hbm: notify response received\n");
1592                 mei_hbm_cl_res(dev, cl_cmd, notify_res_to_fop(cl_cmd));
1593                 break;
1594
1595         case MEI_HBM_NOTIFICATION_CMD:
1596                 dev_dbg(dev->dev, "hbm: notification\n");
1597                 mei_hbm_cl_notify(dev, cl_cmd);
1598                 break;
1599
1600         case MEI_HBM_CLIENT_DMA_MAP_RES_CMD:
1601                 dev_dbg(dev->dev, "hbm: client dma map response: message received.\n");
1602                 client_dma_res = (struct hbm_client_dma_response *)mei_msg;
1603                 mei_hbm_cl_dma_map_res(dev, client_dma_res);
1604                 break;
1605
1606         case MEI_HBM_CLIENT_DMA_UNMAP_RES_CMD:
1607                 dev_dbg(dev->dev, "hbm: client dma unmap response: message received.\n");
1608                 client_dma_res = (struct hbm_client_dma_response *)mei_msg;
1609                 mei_hbm_cl_dma_unmap_res(dev, client_dma_res);
1610                 break;
1611
1612         default:
1613                 WARN(1, "hbm: wrong command %d\n", mei_msg->hbm_cmd);
1614                 return -EPROTO;
1615
1616         }
1617         return 0;
1618 }
1619