linux/drivers/misc/mei/hbm.c
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   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
  18static 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
  35static 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
  50const 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 */
  75static 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 */
  95static 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 */
 107void 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 */
 118void 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
 132static 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 */
 147static inline
 148void 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 */
 170static 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 */
 190static inline
 191bool 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 */
 205static inline
 206struct 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 */
 225int 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 */
 253int 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 */
 289static 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 */
 331static 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 */
 366static 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
 402static 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 */
 434static 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 */
 464static 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 */
 492int 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 */
 520static 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 */
 536static 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 */
 562static 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 */
 587static 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 */
 605int 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 */
 636int 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
 656static 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
 682static 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 */
 716static 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 */
 761int 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}
 780EXPORT_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 */
 789static 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 */
 811int 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 */
 828static 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;
 850out:
 851        mei_me_cl_put(me_cl);
 852        return rets;
 853}
 854
 855/**
 856 * mei_hbm_cl_flow_control_res - flow control response from me
 857 *
 858 * @dev: the device structure
 859 * @fctrl: flow control response bus message
 860 */
 861static 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 */
 889int 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 */
 905int 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 */
 921static 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 */
 942int 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 */
 958static 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 */
 988static 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 */
1043static 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 */
1070static 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 */
1090void mei_hbm_pg_resume(struct mei_device *dev)
1091{
1092        pm_request_resume(dev->dev);
1093}
1094EXPORT_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 */
1103static 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 */
1142static 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 */
1217bool 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 */
1233int 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
1594