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
  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 *
  95 * Return: >=0 on success, <0 on error
  96 */
  97static inline int mei_hbm_write_message(struct mei_device *dev,
  98					struct mei_msg_hdr *hdr,
  99					const void *data)
 100{
 101	return mei_write_message(dev, hdr, sizeof(*hdr), data, hdr->length);
 102}
 103
 104/**
 105 * mei_hbm_idle - set hbm to idle state
 106 *
 107 * @dev: the device structure
 108 */
 109void mei_hbm_idle(struct mei_device *dev)
 110{
 111	dev->init_clients_timer = 0;
 112	dev->hbm_state = MEI_HBM_IDLE;
 113}
 114
 115/**
 116 * mei_hbm_reset - reset hbm counters and book keeping data structures
 117 *
 118 * @dev: the device structure
 119 */
 120void mei_hbm_reset(struct mei_device *dev)
 121{
 122	mei_me_cl_rm_all(dev);
 123
 124	mei_hbm_idle(dev);
 125}
 126
 127/**
 128 * mei_hbm_hdr - construct hbm header
 129 *
 130 * @mei_hdr: hbm header
 131 * @length: payload length
 132 */
 133
 134static inline void mei_hbm_hdr(struct mei_msg_hdr *mei_hdr, size_t length)
 135{
 136	memset(mei_hdr, 0, sizeof(*mei_hdr));
 137	mei_hdr->length = length;
 138	mei_hdr->msg_complete = 1;
 139}
 140
 141/**
 142 * mei_hbm_cl_hdr - construct client hbm header
 143 *
 144 * @cl: client
 145 * @hbm_cmd: host bus message command
 146 * @buf: buffer for cl header
 147 * @len: buffer length
 148 */
 149static inline
 150void mei_hbm_cl_hdr(struct mei_cl *cl, u8 hbm_cmd, void *buf, size_t len)
 151{
 152	struct mei_hbm_cl_cmd *cmd = buf;
 153
 154	memset(cmd, 0, len);
 155
 156	cmd->hbm_cmd = hbm_cmd;
 157	cmd->host_addr = mei_cl_host_addr(cl);
 158	cmd->me_addr = mei_cl_me_id(cl);
 159}
 160
 161/**
 162 * mei_hbm_cl_write - write simple hbm client message
 163 *
 164 * @dev: the device structure
 165 * @cl: client
 166 * @hbm_cmd: host bus message command
 167 * @buf: message buffer
 168 * @len: buffer length
 169 *
 170 * Return: 0 on success, <0 on failure.
 171 */
 172static inline int mei_hbm_cl_write(struct mei_device *dev, struct mei_cl *cl,
 173				   u8 hbm_cmd, void *buf, size_t len)
 174{
 175	struct mei_msg_hdr mei_hdr;
 176
 177	mei_hbm_hdr(&mei_hdr, len);
 178	mei_hbm_cl_hdr(cl, hbm_cmd, buf, len);
 179
 180	return mei_hbm_write_message(dev, &mei_hdr, buf);
 181}
 182
 183/**
 184 * mei_hbm_cl_addr_equal - check if the client's and
 185 *	the message address match
 186 *
 187 * @cl: client
 188 * @cmd: hbm client message
 189 *
 190 * Return: true if addresses are the same
 191 */
 192static inline
 193bool mei_hbm_cl_addr_equal(struct mei_cl *cl, struct mei_hbm_cl_cmd *cmd)
 194{
 195	return  mei_cl_host_addr(cl) == cmd->host_addr &&
 196		mei_cl_me_id(cl) == cmd->me_addr;
 197}
 198
 199/**
 200 * mei_hbm_cl_find_by_cmd - find recipient client
 201 *
 202 * @dev: the device structure
 203 * @buf: a buffer with hbm cl command
 204 *
 205 * Return: the recipient client or NULL if not found
 206 */
 207static inline
 208struct mei_cl *mei_hbm_cl_find_by_cmd(struct mei_device *dev, void *buf)
 209{
 210	struct mei_hbm_cl_cmd *cmd = (struct mei_hbm_cl_cmd *)buf;
 211	struct mei_cl *cl;
 212
 213	list_for_each_entry(cl, &dev->file_list, link)
 214		if (mei_hbm_cl_addr_equal(cl, cmd))
 215			return cl;
 216	return NULL;
 217}
 218
 219
 220/**
 221 * mei_hbm_start_wait - wait for start response message.
 222 *
 223 * @dev: the device structure
 224 *
 225 * Return: 0 on success and < 0 on failure
 226 */
 227int mei_hbm_start_wait(struct mei_device *dev)
 228{
 229	int ret;
 230
 231	if (dev->hbm_state > MEI_HBM_STARTING)
 232		return 0;
 233
 234	mutex_unlock(&dev->device_lock);
 235	ret = wait_event_timeout(dev->wait_hbm_start,
 236			dev->hbm_state != MEI_HBM_STARTING,
 237			dev->timeouts.hbm);
 238	mutex_lock(&dev->device_lock);
 239
 240	if (ret == 0 && (dev->hbm_state <= MEI_HBM_STARTING)) {
 241		dev->hbm_state = MEI_HBM_IDLE;
 242		dev_err(&dev->dev, "waiting for mei start failed\n");
 243		return -ETIME;
 244	}
 245	return 0;
 246}
 247
 248/**
 249 * mei_hbm_start_req - sends start request message.
 250 *
 251 * @dev: the device structure
 252 *
 253 * Return: 0 on success and < 0 on failure
 254 */
 255int mei_hbm_start_req(struct mei_device *dev)
 256{
 257	struct mei_msg_hdr mei_hdr;
 258	struct hbm_host_version_request req;
 259	int ret;
 260
 261	mei_hbm_reset(dev);
 262
 263	mei_hbm_hdr(&mei_hdr, sizeof(req));
 264
 265	/* host start message */
 266	memset(&req, 0, sizeof(req));
 267	req.hbm_cmd = HOST_START_REQ_CMD;
 268	req.host_version.major_version = HBM_MAJOR_VERSION;
 269	req.host_version.minor_version = HBM_MINOR_VERSION;
 270
 271	dev->hbm_state = MEI_HBM_IDLE;
 272	ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 273	if (ret) {
 274		dev_err(&dev->dev, "version message write failed: ret = %d\n", ret);
 275		return ret;
 276	}
 277
 278	dev->hbm_state = MEI_HBM_STARTING;
 279	dev->init_clients_timer = dev->timeouts.client_init;
 280	mei_schedule_stall_timer(dev);
 281	return 0;
 282}
 283
 284/**
 285 * mei_hbm_dma_setup_req() - setup DMA request
 286 * @dev: the device structure
 287 *
 288 * Return: 0 on success and < 0 on failure
 289 */
 290static int mei_hbm_dma_setup_req(struct mei_device *dev)
 291{
 292	struct mei_msg_hdr mei_hdr;
 293	struct hbm_dma_setup_request req;
 294	unsigned int i;
 295	int ret;
 296
 297	mei_hbm_hdr(&mei_hdr, sizeof(req));
 298
 299	memset(&req, 0, sizeof(req));
 300	req.hbm_cmd = MEI_HBM_DMA_SETUP_REQ_CMD;
 301	for (i = 0; i < DMA_DSCR_NUM; i++) {
 302		phys_addr_t paddr;
 303
 304		paddr = dev->dr_dscr[i].daddr;
 305		req.dma_dscr[i].addr_hi = upper_32_bits(paddr);
 306		req.dma_dscr[i].addr_lo = lower_32_bits(paddr);
 307		req.dma_dscr[i].size = dev->dr_dscr[i].size;
 308	}
 309
 310	mei_dma_ring_reset(dev);
 311
 312	ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 313	if (ret) {
 314		dev_err(&dev->dev, "dma setup request write failed: ret = %d.\n", 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 */
 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
 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, "capabilities request write failed: ret = %d.\n", ret);
 353		return ret;
 354	}
 355
 356	dev->hbm_state = MEI_HBM_CAP_SETUP;
 357	dev->init_clients_timer = dev->timeouts.client_init;
 358	mei_schedule_stall_timer(dev);
 359	return 0;
 360}
 361
 362/**
 363 * mei_hbm_enum_clients_req - sends enumeration client request message.
 364 *
 365 * @dev: the device structure
 366 *
 367 * Return: 0 on success and < 0 on failure
 368 */
 369static int mei_hbm_enum_clients_req(struct mei_device *dev)
 370{
 371	struct mei_msg_hdr mei_hdr;
 372	struct hbm_host_enum_request req;
 373	int ret;
 374
 375	/* enumerate clients */
 376	mei_hbm_hdr(&mei_hdr, sizeof(req));
 377
 378	memset(&req, 0, sizeof(req));
 379	req.hbm_cmd = HOST_ENUM_REQ_CMD;
 380	req.flags |= dev->hbm_f_dc_supported ? MEI_HBM_ENUM_F_ALLOW_ADD : 0;
 381	req.flags |= dev->hbm_f_ie_supported ?
 382			  MEI_HBM_ENUM_F_IMMEDIATE_ENUM : 0;
 383
 384	ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 385	if (ret) {
 386		dev_err(&dev->dev, "enumeration request write failed: ret = %d.\n", ret);
 387		return ret;
 388	}
 389	dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
 390	dev->init_clients_timer = dev->timeouts.client_init;
 391	mei_schedule_stall_timer(dev);
 392	return 0;
 393}
 394
 395/**
 396 * mei_hbm_me_cl_add - add new me client to the list
 397 *
 398 * @dev: the device structure
 399 * @res: hbm property response
 400 *
 401 * Return: 0 on success and -ENOMEM on allocation failure
 402 */
 403
 404static int mei_hbm_me_cl_add(struct mei_device *dev,
 405			     struct hbm_props_response *res)
 406{
 407	struct mei_me_client *me_cl;
 408	const uuid_le *uuid = &res->client_properties.protocol_name;
 409
 410	mei_me_cl_rm_by_uuid(dev, uuid);
 411
 412	me_cl = kzalloc(sizeof(*me_cl), GFP_KERNEL);
 413	if (!me_cl)
 414		return -ENOMEM;
 415
 416	mei_me_cl_init(me_cl);
 417
 418	me_cl->props = res->client_properties;
 419	me_cl->client_id = res->me_addr;
 420	me_cl->tx_flow_ctrl_creds = 0;
 421
 422	mei_me_cl_add(dev, me_cl);
 423
 424	return 0;
 425}
 426
 427/**
 428 * mei_hbm_add_cl_resp - send response to fw on client add request
 429 *
 430 * @dev: the device structure
 431 * @addr: me address
 432 * @status: response status
 433 *
 434 * Return: 0 on success and < 0 on failure
 435 */
 436static int mei_hbm_add_cl_resp(struct mei_device *dev, u8 addr, u8 status)
 437{
 438	struct mei_msg_hdr mei_hdr;
 439	struct hbm_add_client_response resp;
 440	int ret;
 441
 442	dev_dbg(&dev->dev, "adding client response\n");
 443
 444	mei_hbm_hdr(&mei_hdr, sizeof(resp));
 445
 446	memset(&resp, 0, sizeof(resp));
 447	resp.hbm_cmd = MEI_HBM_ADD_CLIENT_RES_CMD;
 448	resp.me_addr = addr;
 449	resp.status  = status;
 450
 451	ret = mei_hbm_write_message(dev, &mei_hdr, &resp);
 452	if (ret)
 453		dev_err(&dev->dev, "add client response write failed: ret = %d\n", ret);
 454	return ret;
 455}
 456
 457/**
 458 * mei_hbm_fw_add_cl_req - request from the fw to add a client
 459 *
 460 * @dev: the device structure
 461 * @req: add client request
 462 *
 463 * Return: 0 on success and < 0 on failure
 464 */
 465static int mei_hbm_fw_add_cl_req(struct mei_device *dev,
 466			      struct hbm_add_client_request *req)
 467{
 468	int ret;
 469	u8 status = MEI_HBMS_SUCCESS;
 470
 471	BUILD_BUG_ON(sizeof(struct hbm_add_client_request) !=
 472			sizeof(struct hbm_props_response));
 473
 474	ret = mei_hbm_me_cl_add(dev, (struct hbm_props_response *)req);
 475	if (ret)
 476		status = !MEI_HBMS_SUCCESS;
 477
 478	if (dev->dev_state == MEI_DEV_ENABLED)
 479		schedule_work(&dev->bus_rescan_work);
 480
 481	return mei_hbm_add_cl_resp(dev, req->me_addr, status);
 482}
 483
 484/**
 485 * mei_hbm_cl_notify_req - send notification request
 486 *
 487 * @dev: the device structure
 488 * @cl: a client to disconnect from
 489 * @start: true for start false for stop
 490 *
 491 * Return: 0 on success and -EIO on write failure
 492 */
 493int mei_hbm_cl_notify_req(struct mei_device *dev,
 494			  struct mei_cl *cl, u8 start)
 495{
 496
 497	struct mei_msg_hdr mei_hdr;
 498	struct hbm_notification_request req;
 499	int ret;
 500
 501	mei_hbm_hdr(&mei_hdr, sizeof(req));
 502	mei_hbm_cl_hdr(cl, MEI_HBM_NOTIFY_REQ_CMD, &req, sizeof(req));
 503
 504	req.start = start;
 505
 506	ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 507	if (ret)
 508		cl_err(dev, cl, "notify request failed: ret = %d\n", ret);
 509
 510	return ret;
 511}
 512
 513/**
 514 *  notify_res_to_fop - convert notification response to the proper
 515 *      notification FOP
 516 *
 517 * @cmd: client notification start response command
 518 *
 519 * Return:  MEI_FOP_NOTIFY_START or MEI_FOP_NOTIFY_STOP;
 520 */
 521static inline enum mei_cb_file_ops notify_res_to_fop(struct mei_hbm_cl_cmd *cmd)
 522{
 523	struct hbm_notification_response *rs =
 524		(struct hbm_notification_response *)cmd;
 525
 526	return mei_cl_notify_req2fop(rs->start);
 527}
 528
 529/**
 530 * mei_hbm_cl_notify_start_res - update the client state according
 531 *       notify start response
 532 *
 533 * @dev: the device structure
 534 * @cl: mei host client
 535 * @cmd: client notification start response command
 536 */
 537static void mei_hbm_cl_notify_start_res(struct mei_device *dev,
 538					struct mei_cl *cl,
 539					struct mei_hbm_cl_cmd *cmd)
 540{
 541	struct hbm_notification_response *rs =
 542		(struct hbm_notification_response *)cmd;
 543
 544	cl_dbg(dev, cl, "hbm: notify start response status=%d\n", rs->status);
 545
 546	if (rs->status == MEI_HBMS_SUCCESS ||
 547	    rs->status == MEI_HBMS_ALREADY_STARTED) {
 548		cl->notify_en = true;
 549		cl->status = 0;
 550	} else {
 551		cl->status = -EINVAL;
 552	}
 553}
 554
 555/**
 556 * mei_hbm_cl_notify_stop_res - update the client state according
 557 *       notify stop response
 558 *
 559 * @dev: the device structure
 560 * @cl: mei host client
 561 * @cmd: client notification stop response command
 562 */
 563static void mei_hbm_cl_notify_stop_res(struct mei_device *dev,
 564				       struct mei_cl *cl,
 565				       struct mei_hbm_cl_cmd *cmd)
 566{
 567	struct hbm_notification_response *rs =
 568		(struct hbm_notification_response *)cmd;
 569
 570	cl_dbg(dev, cl, "hbm: notify stop response status=%d\n", rs->status);
 571
 572	if (rs->status == MEI_HBMS_SUCCESS ||
 573	    rs->status == MEI_HBMS_NOT_STARTED) {
 574		cl->notify_en = false;
 575		cl->status = 0;
 576	} else {
 577		/* TODO: spec is not clear yet about other possible issues */
 578		cl->status = -EINVAL;
 579	}
 580}
 581
 582/**
 583 * mei_hbm_cl_notify - signal notification event
 584 *
 585 * @dev: the device structure
 586 * @cmd: notification client message
 587 */
 588static void mei_hbm_cl_notify(struct mei_device *dev,
 589			      struct mei_hbm_cl_cmd *cmd)
 590{
 591	struct mei_cl *cl;
 592
 593	cl = mei_hbm_cl_find_by_cmd(dev, cmd);
 594	if (cl)
 595		mei_cl_notify(cl);
 596}
 597
 598/**
 599 * mei_hbm_cl_dma_map_req - send client dma map request
 600 *
 601 * @dev: the device structure
 602 * @cl: mei host client
 603 *
 604 * Return: 0 on success and -EIO on write failure
 605 */
 606int mei_hbm_cl_dma_map_req(struct mei_device *dev, struct mei_cl *cl)
 607{
 608	struct mei_msg_hdr mei_hdr;
 609	struct hbm_client_dma_map_request req;
 610	int ret;
 611
 612	mei_hbm_hdr(&mei_hdr, sizeof(req));
 613
 614	memset(&req, 0, sizeof(req));
 615
 616	req.hbm_cmd = MEI_HBM_CLIENT_DMA_MAP_REQ_CMD;
 617	req.client_buffer_id = cl->dma.buffer_id;
 618	req.address_lsb = lower_32_bits(cl->dma.daddr);
 619	req.address_msb = upper_32_bits(cl->dma.daddr);
 620	req.size = cl->dma.size;
 621
 622	ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 623	if (ret)
 624		cl_err(dev, cl, "dma map request failed: ret = %d\n", ret);
 625
 626	return ret;
 627}
 628
 629/**
 630 * mei_hbm_cl_dma_unmap_req - send client dma unmap request
 631 *
 632 * @dev: the device structure
 633 * @cl: mei host client
 634 *
 635 * Return: 0 on success and -EIO on write failure
 636 */
 637int mei_hbm_cl_dma_unmap_req(struct mei_device *dev, struct mei_cl *cl)
 638{
 639	struct mei_msg_hdr mei_hdr;
 640	struct hbm_client_dma_unmap_request req;
 641	int ret;
 642
 643	mei_hbm_hdr(&mei_hdr, sizeof(req));
 644
 645	memset(&req, 0, sizeof(req));
 646
 647	req.hbm_cmd = MEI_HBM_CLIENT_DMA_UNMAP_REQ_CMD;
 648	req.client_buffer_id = cl->dma.buffer_id;
 649
 650	ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 651	if (ret)
 652		cl_err(dev, cl, "dma unmap request failed: ret = %d\n", ret);
 653
 654	return ret;
 655}
 656
 657static void mei_hbm_cl_dma_map_res(struct mei_device *dev,
 658				   struct hbm_client_dma_response *res)
 659{
 660	struct mei_cl *cl;
 661	struct mei_cl_cb *cb, *next;
 662
 663	cl = NULL;
 664	list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
 665		if (cb->fop_type != MEI_FOP_DMA_MAP)
 666			continue;
 667		if (!cb->cl->dma.buffer_id || cb->cl->dma_mapped)
 668			continue;
 669
 670		cl = cb->cl;
 671		break;
 672	}
 673	if (!cl)
 674		return;
 675
 676	if (res->status) {
 677		cl_err(dev, cl, "cl dma map failed %d\n", res->status);
 678		cl->status = -EFAULT;
 679	} else {
 680		cl_dbg(dev, cl, "cl dma map succeeded\n");
 681		cl->dma_mapped = 1;
 682		cl->status = 0;
 683	}
 684	wake_up(&cl->wait);
 685}
 686
 687static void mei_hbm_cl_dma_unmap_res(struct mei_device *dev,
 688				     struct hbm_client_dma_response *res)
 689{
 690	struct mei_cl *cl;
 691	struct mei_cl_cb *cb, *next;
 692
 693	cl = NULL;
 694	list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
 695		if (cb->fop_type != MEI_FOP_DMA_UNMAP)
 696			continue;
 697		if (!cb->cl->dma.buffer_id || !cb->cl->dma_mapped)
 698			continue;
 699
 700		cl = cb->cl;
 701		break;
 702	}
 703	if (!cl)
 704		return;
 705
 706	if (res->status) {
 707		cl_err(dev, cl, "cl dma unmap failed %d\n", res->status);
 708		cl->status = -EFAULT;
 709	} else {
 710		cl_dbg(dev, cl, "cl dma unmap succeeded\n");
 711		cl->dma_mapped = 0;
 712		cl->status = 0;
 713	}
 714	wake_up(&cl->wait);
 715}
 716
 717/**
 718 * mei_hbm_prop_req - request property for a single client
 719 *
 720 * @dev: the device structure
 721 * @start_idx: client index to start search
 722 *
 723 * Return: 0 on success and < 0 on failure
 724 */
 725static int mei_hbm_prop_req(struct mei_device *dev, unsigned long start_idx)
 726{
 727	struct mei_msg_hdr mei_hdr;
 728	struct hbm_props_request req;
 729	unsigned long addr;
 730	int ret;
 731
 732	addr = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, start_idx);
 733
 734	/* We got all client properties */
 735	if (addr == MEI_CLIENTS_MAX) {
 736		dev->hbm_state = MEI_HBM_STARTED;
 737		mei_host_client_init(dev);
 738		return 0;
 739	}
 740
 741	mei_hbm_hdr(&mei_hdr, sizeof(req));
 742
 743	memset(&req, 0, sizeof(req));
 744
 745	req.hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
 746	req.me_addr = addr;
 747
 748	ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 749	if (ret) {
 750		dev_err(&dev->dev, "properties request write failed: ret = %d\n",
 751			ret);
 752		return ret;
 753	}
 754
 755	dev->init_clients_timer = dev->timeouts.client_init;
 756	mei_schedule_stall_timer(dev);
 757
 758	return 0;
 759}
 760
 761/**
 762 * mei_hbm_pg - sends pg command
 763 *
 764 * @dev: the device structure
 765 * @pg_cmd: the pg command code
 766 *
 767 * Return: -EIO on write failure
 768 *         -EOPNOTSUPP if the operation is not supported by the protocol
 769 */
 770int mei_hbm_pg(struct mei_device *dev, u8 pg_cmd)
 771{
 772	struct mei_msg_hdr mei_hdr;
 773	struct hbm_power_gate req;
 774	int ret;
 775
 776	if (!dev->hbm_f_pg_supported)
 777		return -EOPNOTSUPP;
 778
 779	mei_hbm_hdr(&mei_hdr, sizeof(req));
 780
 781	memset(&req, 0, sizeof(req));
 782	req.hbm_cmd = pg_cmd;
 783
 784	ret = mei_hbm_write_message(dev, &mei_hdr, &req);
 785	if (ret)
 786		dev_err(&dev->dev, "power gate command write failed.\n");
 787	return ret;
 788}
 789EXPORT_SYMBOL_GPL(mei_hbm_pg);
 790
 791/**
 792 * mei_hbm_stop_req - send stop request message
 793 *
 794 * @dev: mei device
 795 *
 796 * Return: -EIO on write failure
 797 */
 798static int mei_hbm_stop_req(struct mei_device *dev)
 799{
 800	struct mei_msg_hdr mei_hdr;
 801	struct hbm_host_stop_request req;
 802
 803	mei_hbm_hdr(&mei_hdr, sizeof(req));
 804
 805	memset(&req, 0, sizeof(req));
 806	req.hbm_cmd = HOST_STOP_REQ_CMD;
 807	req.reason = DRIVER_STOP_REQUEST;
 808
 809	return mei_hbm_write_message(dev, &mei_hdr, &req);
 810}
 811
 812/**
 813 * mei_hbm_cl_flow_control_req - sends flow control request.
 814 *
 815 * @dev: the device structure
 816 * @cl: client info
 817 *
 818 * Return: -EIO on write failure
 819 */
 820int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
 821{
 822	struct hbm_flow_control req;
 823
 824	cl_dbg(dev, cl, "sending flow control\n");
 825	return mei_hbm_cl_write(dev, cl, MEI_FLOW_CONTROL_CMD,
 826				&req, sizeof(req));
 827}
 828
 829/**
 830 * mei_hbm_add_single_tx_flow_ctrl_creds - adds single buffer credentials.
 831 *
 832 * @dev: the device structure
 833 * @fctrl: flow control response bus message
 834 *
 835 * Return: 0 on success, < 0 otherwise
 836 */
 837static int mei_hbm_add_single_tx_flow_ctrl_creds(struct mei_device *dev,
 838						 struct hbm_flow_control *fctrl)
 839{
 840	struct mei_me_client *me_cl;
 841	int rets;
 842
 843	me_cl = mei_me_cl_by_id(dev, fctrl->me_addr);
 844	if (!me_cl) {
 845		dev_err(&dev->dev, "no such me client %d\n", fctrl->me_addr);
 846		return -ENOENT;
 847	}
 848
 849	if (WARN_ON(me_cl->props.single_recv_buf == 0)) {
 850		rets = -EINVAL;
 851		goto out;
 852	}
 853
 854	me_cl->tx_flow_ctrl_creds++;
 855	dev_dbg(&dev->dev, "recv flow ctrl msg ME %d (single) creds = %d.\n",
 856		fctrl->me_addr, me_cl->tx_flow_ctrl_creds);
 857
 858	rets = 0;
 859out:
 860	mei_me_cl_put(me_cl);
 861	return rets;
 862}
 863
 864/**
 865 * mei_hbm_cl_tx_flow_ctrl_creds_res - flow control response from me
 866 *
 867 * @dev: the device structure
 868 * @fctrl: flow control response bus message
 869 */
 870static void mei_hbm_cl_tx_flow_ctrl_creds_res(struct mei_device *dev,
 871					       struct hbm_flow_control *fctrl)
 872{
 873	struct mei_cl *cl;
 874
 875	if (!fctrl->host_addr) {
 876		/* single receive buffer */
 877		mei_hbm_add_single_tx_flow_ctrl_creds(dev, fctrl);
 878		return;
 879	}
 880
 881	cl = mei_hbm_cl_find_by_cmd(dev, fctrl);
 882	if (cl) {
 883		cl->tx_flow_ctrl_creds++;
 884		cl_dbg(dev, cl, "flow control creds = %d.\n",
 885				cl->tx_flow_ctrl_creds);
 886	}
 887}
 888
 889
 890/**
 891 * mei_hbm_cl_disconnect_req - sends disconnect message to fw.
 892 *
 893 * @dev: the device structure
 894 * @cl: a client to disconnect from
 895 *
 896 * Return: -EIO on write failure
 897 */
 898int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
 899{
 900	struct hbm_client_connect_request req;
 901
 902	return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_REQ_CMD,
 903				&req, sizeof(req));
 904}
 905
 906/**
 907 * mei_hbm_cl_disconnect_rsp - sends disconnect response to the FW
 908 *
 909 * @dev: the device structure
 910 * @cl: a client to disconnect from
 911 *
 912 * Return: -EIO on write failure
 913 */
 914int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
 915{
 916	struct hbm_client_connect_response resp;
 917
 918	return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_RES_CMD,
 919				&resp, sizeof(resp));
 920}
 921
 922/**
 923 * mei_hbm_cl_disconnect_res - update the client state according
 924 *       disconnect response
 925 *
 926 * @dev: the device structure
 927 * @cl: mei host client
 928 * @cmd: disconnect client response host bus message
 929 */
 930static void mei_hbm_cl_disconnect_res(struct mei_device *dev, struct mei_cl *cl,
 931				      struct mei_hbm_cl_cmd *cmd)
 932{
 933	struct hbm_client_connect_response *rs =
 934		(struct hbm_client_connect_response *)cmd;
 935
 936	cl_dbg(dev, cl, "hbm: disconnect response status=%d\n", rs->status);
 937
 938	if (rs->status == MEI_CL_DISCONN_SUCCESS)
 939		cl->state = MEI_FILE_DISCONNECT_REPLY;
 940	cl->status = 0;
 941}
 942
 943/**
 944 * mei_hbm_cl_connect_req - send connection request to specific me client
 945 *
 946 * @dev: the device structure
 947 * @cl: a client to connect to
 948 *
 949 * Return: -EIO on write failure
 950 */
 951int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
 952{
 953	struct hbm_client_connect_request req;
 954
 955	return mei_hbm_cl_write(dev, cl, CLIENT_CONNECT_REQ_CMD,
 956				&req, sizeof(req));
 957}
 958
 959/**
 960 * mei_hbm_cl_connect_res - update the client state according
 961 *        connection response
 962 *
 963 * @dev: the device structure
 964 * @cl: mei host client
 965 * @cmd: connect client response host bus message
 966 */
 967static void mei_hbm_cl_connect_res(struct mei_device *dev, struct mei_cl *cl,
 968				   struct mei_hbm_cl_cmd *cmd)
 969{
 970	struct hbm_client_connect_response *rs =
 971		(struct hbm_client_connect_response *)cmd;
 972
 973	cl_dbg(dev, cl, "hbm: connect response status=%s\n",
 974			mei_cl_conn_status_str(rs->status));
 975
 976	if (rs->status == MEI_CL_CONN_SUCCESS)
 977		cl->state = MEI_FILE_CONNECTED;
 978	else {
 979		cl->state = MEI_FILE_DISCONNECT_REPLY;
 980		if (rs->status == MEI_CL_CONN_NOT_FOUND) {
 981			mei_me_cl_del(dev, cl->me_cl);
 982			if (dev->dev_state == MEI_DEV_ENABLED)
 983				schedule_work(&dev->bus_rescan_work);
 984		}
 985	}
 986	cl->status = mei_cl_conn_status_to_errno(rs->status);
 987}
 988
 989/**
 990 * mei_hbm_cl_res - process hbm response received on behalf
 991 *         an client
 992 *
 993 * @dev: the device structure
 994 * @rs:  hbm client message
 995 * @fop_type: file operation type
 996 */
 997static void mei_hbm_cl_res(struct mei_device *dev,
 998			   struct mei_hbm_cl_cmd *rs,
 999			   enum mei_cb_file_ops fop_type)
1000{
1001	struct mei_cl *cl;
1002	struct mei_cl_cb *cb, *next;
1003
1004	cl = NULL;
1005	list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
1006
1007		cl = cb->cl;
1008
1009		if (cb->fop_type != fop_type)
1010			continue;
1011
1012		if (mei_hbm_cl_addr_equal(cl, rs)) {
1013			list_del_init(&cb->list);
1014			break;
1015		}
1016	}
1017
1018	if (!cl)
1019		return;
1020
1021	switch (fop_type) {
1022	case MEI_FOP_CONNECT:
1023		mei_hbm_cl_connect_res(dev, cl, rs);
1024		break;
1025	case MEI_FOP_DISCONNECT:
1026		mei_hbm_cl_disconnect_res(dev, cl, rs);
1027		break;
1028	case MEI_FOP_NOTIFY_START:
1029		mei_hbm_cl_notify_start_res(dev, cl, rs);
1030		break;
1031	case MEI_FOP_NOTIFY_STOP:
1032		mei_hbm_cl_notify_stop_res(dev, cl, rs);
1033		break;
1034	default:
1035		return;
1036	}
1037
1038	cl->timer_count = 0;
1039	wake_up(&cl->wait);
1040}
1041
1042
1043/**
1044 * mei_hbm_fw_disconnect_req - disconnect request initiated by ME firmware
1045 *  host sends disconnect response
1046 *
1047 * @dev: the device structure.
1048 * @disconnect_req: disconnect request bus message from the me
1049 *
1050 * Return: -ENOMEM on allocation failure
1051 */
1052static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
1053		struct hbm_client_connect_request *disconnect_req)
1054{
1055	struct mei_cl *cl;
1056	struct mei_cl_cb *cb;
1057
1058	cl = mei_hbm_cl_find_by_cmd(dev, disconnect_req);
1059	if (cl) {
1060		cl_warn(dev, cl, "fw disconnect request received\n");
1061		cl->state = MEI_FILE_DISCONNECTING;
1062		cl->timer_count = 0;
1063
1064		cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DISCONNECT_RSP,
1065					       NULL);
1066		if (!cb)
1067			return -ENOMEM;
1068	}
1069	return 0;
1070}
1071
1072/**
1073 * mei_hbm_pg_enter_res - PG enter response received
1074 *
1075 * @dev: the device structure.
1076 *
1077 * Return: 0 on success, -EPROTO on state mismatch
1078 */
1079static int mei_hbm_pg_enter_res(struct mei_device *dev)
1080{
1081	if (mei_pg_state(dev) != MEI_PG_OFF ||
1082	    dev->pg_event != MEI_PG_EVENT_WAIT) {
1083		dev_err(&dev->dev, "hbm: pg entry response: state mismatch [%s, %d]\n",
1084			mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
1085		return -EPROTO;
1086	}
1087
1088	dev->pg_event = MEI_PG_EVENT_RECEIVED;
1089	wake_up(&dev->wait_pg);
1090
1091	return 0;
1092}
1093
1094/**
1095 * mei_hbm_pg_resume - process with PG resume
1096 *
1097 * @dev: the device structure.
1098 */
1099void mei_hbm_pg_resume(struct mei_device *dev)
1100{
1101	pm_request_resume(dev->parent);
1102}
1103EXPORT_SYMBOL_GPL(mei_hbm_pg_resume);
1104
1105/**
1106 * mei_hbm_pg_exit_res - PG exit response received
1107 *
1108 * @dev: the device structure.
1109 *
1110 * Return: 0 on success, -EPROTO on state mismatch
1111 */
1112static int mei_hbm_pg_exit_res(struct mei_device *dev)
1113{
1114	if (mei_pg_state(dev) != MEI_PG_ON ||
1115	    (dev->pg_event != MEI_PG_EVENT_WAIT &&
1116	     dev->pg_event != MEI_PG_EVENT_IDLE)) {
1117		dev_err(&dev->dev, "hbm: pg exit response: state mismatch [%s, %d]\n",
1118			mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
1119		return -EPROTO;
1120	}
1121
1122	switch (dev->pg_event) {
1123	case MEI_PG_EVENT_WAIT:
1124		dev->pg_event = MEI_PG_EVENT_RECEIVED;
1125		wake_up(&dev->wait_pg);
1126		break;
1127	case MEI_PG_EVENT_IDLE:
1128		/*
1129		* If the driver is not waiting on this then
1130		* this is HW initiated exit from PG.
1131		* Start runtime pm resume sequence to exit from PG.
1132		*/
1133		dev->pg_event = MEI_PG_EVENT_RECEIVED;
1134		mei_hbm_pg_resume(dev);
1135		break;
1136	default:
1137		WARN(1, "hbm: pg exit response: unexpected pg event = %d\n",
1138		     dev->pg_event);
1139		return -EPROTO;
1140	}
1141
1142	return 0;
1143}
1144
1145/**
1146 * mei_hbm_config_features - check what hbm features and commands
1147 *        are supported by the fw
1148 *
1149 * @dev: the device structure
1150 */
1151static void mei_hbm_config_features(struct mei_device *dev)
1152{
1153	/* Power Gating Isolation Support */
1154	dev->hbm_f_pg_supported = 0;
1155	if (dev->version.major_version > HBM_MAJOR_VERSION_PGI)
1156		dev->hbm_f_pg_supported = 1;
1157
1158	if (dev->version.major_version == HBM_MAJOR_VERSION_PGI &&
1159	    dev->version.minor_version >= HBM_MINOR_VERSION_PGI)
1160		dev->hbm_f_pg_supported = 1;
1161
1162	dev->hbm_f_dc_supported = 0;
1163	if (dev->version.major_version >= HBM_MAJOR_VERSION_DC)
1164		dev->hbm_f_dc_supported = 1;
1165
1166	dev->hbm_f_ie_supported = 0;
1167	if (dev->version.major_version >= HBM_MAJOR_VERSION_IE)
1168		dev->hbm_f_ie_supported = 1;
1169
1170	/* disconnect on connect timeout instead of link reset */
1171	dev->hbm_f_dot_supported = 0;
1172	if (dev->version.major_version >= HBM_MAJOR_VERSION_DOT)
1173		dev->hbm_f_dot_supported = 1;
1174
1175	/* Notification Event Support */
1176	dev->hbm_f_ev_supported = 0;
1177	if (dev->version.major_version >= HBM_MAJOR_VERSION_EV)
1178		dev->hbm_f_ev_supported = 1;
1179
1180	/* Fixed Address Client Support */
1181	dev->hbm_f_fa_supported = 0;
1182	if (dev->version.major_version >= HBM_MAJOR_VERSION_FA)
1183		dev->hbm_f_fa_supported = 1;
1184
1185	/* OS ver message Support */
1186	dev->hbm_f_os_supported = 0;
1187	if (dev->version.major_version >= HBM_MAJOR_VERSION_OS)
1188		dev->hbm_f_os_supported = 1;
1189
1190	/* DMA Ring Support */
1191	dev->hbm_f_dr_supported = 0;
1192	if (dev->version.major_version > HBM_MAJOR_VERSION_DR ||
1193	    (dev->version.major_version == HBM_MAJOR_VERSION_DR &&
1194	     dev->version.minor_version >= HBM_MINOR_VERSION_DR))
1195		dev->hbm_f_dr_supported = 1;
1196
1197	/* VTag Support */
1198	dev->hbm_f_vt_supported = 0;
1199	if (dev->version.major_version > HBM_MAJOR_VERSION_VT ||
1200	    (dev->version.major_version == HBM_MAJOR_VERSION_VT &&
1201	     dev->version.minor_version >= HBM_MINOR_VERSION_VT))
1202		dev->hbm_f_vt_supported = 1;
1203
1204	/* GSC support */
1205	if (dev->version.major_version > HBM_MAJOR_VERSION_GSC ||
1206	    (dev->version.major_version == HBM_MAJOR_VERSION_GSC &&
1207	     dev->version.minor_version >= HBM_MINOR_VERSION_GSC))
1208		dev->hbm_f_gsc_supported = 1;
1209
1210	/* Capability message Support */
1211	dev->hbm_f_cap_supported = 0;
1212	if (dev->version.major_version > HBM_MAJOR_VERSION_CAP ||
1213	    (dev->version.major_version == HBM_MAJOR_VERSION_CAP &&
1214	     dev->version.minor_version >= HBM_MINOR_VERSION_CAP))
1215		dev->hbm_f_cap_supported = 1;
1216
1217	/* Client DMA Support */
1218	dev->hbm_f_cd_supported = 0;
1219	if (dev->version.major_version > HBM_MAJOR_VERSION_CD ||
1220	    (dev->version.major_version == HBM_MAJOR_VERSION_CD &&
1221	     dev->version.minor_version >= HBM_MINOR_VERSION_CD))
1222		dev->hbm_f_cd_supported = 1;
1223}
1224
1225/**
1226 * mei_hbm_version_is_supported - checks whether the driver can
1227 *     support the hbm version of the device
1228 *
1229 * @dev: the device structure
1230 * Return: true if driver can support hbm version of the device
1231 */
1232bool mei_hbm_version_is_supported(struct mei_device *dev)
1233{
1234	return	(dev->version.major_version < HBM_MAJOR_VERSION) ||
1235		(dev->version.major_version == HBM_MAJOR_VERSION &&
1236		 dev->version.minor_version <= HBM_MINOR_VERSION);
1237}
1238
1239/**
1240 * mei_hbm_dispatch - bottom half read routine after ISR to
1241 * handle the read bus message cmd processing.
1242 *
1243 * @dev: the device structure
1244 * @hdr: header of bus message
1245 *
1246 * Return: 0 on success and < 0 on failure
1247 */
1248int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
1249{
1250	struct mei_bus_message *mei_msg;
1251	struct hbm_host_version_response *version_res;
1252	struct hbm_props_response *props_res;
1253	struct hbm_host_enum_response *enum_res;
1254	struct hbm_dma_setup_response *dma_setup_res;
1255	struct hbm_add_client_request *add_cl_req;
1256	struct hbm_capability_response *capability_res;
1257	int ret;
1258
1259	struct mei_hbm_cl_cmd *cl_cmd;
1260	struct hbm_client_connect_request *disconnect_req;
1261	struct hbm_flow_control *fctrl;
1262	struct hbm_client_dma_response *client_dma_res;
1263
1264	/* read the message to our buffer */
1265	BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
1266	mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
1267	mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
1268	cl_cmd  = (struct mei_hbm_cl_cmd *)mei_msg;
1269
1270	/* ignore spurious message and prevent reset nesting
1271	 * hbm is put to idle during system reset
1272	 */
1273	if (dev->hbm_state == MEI_HBM_IDLE) {
1274		dev_dbg(&dev->dev, "hbm: state is idle ignore spurious messages\n");
1275		return 0;
1276	}
1277
1278	switch (mei_msg->hbm_cmd) {
1279	case HOST_START_RES_CMD:
1280		dev_dbg(&dev->dev, "hbm: start: response message received.\n");
1281
1282		dev->init_clients_timer = 0;
1283
1284		version_res = (struct hbm_host_version_response *)mei_msg;
1285
1286		dev_dbg(&dev->dev, "HBM VERSION: DRIVER=%02d:%02d DEVICE=%02d:%02d\n",
1287				HBM_MAJOR_VERSION, HBM_MINOR_VERSION,
1288				version_res->me_max_version.major_version,
1289				version_res->me_max_version.minor_version);
1290
1291		if (version_res->host_version_supported) {
1292			dev->version.major_version = HBM_MAJOR_VERSION;
1293			dev->version.minor_version = HBM_MINOR_VERSION;
1294		} else {
1295			dev->version.major_version =
1296				version_res->me_max_version.major_version;
1297			dev->version.minor_version =
1298				version_res->me_max_version.minor_version;
1299		}
1300
1301		if (!mei_hbm_version_is_supported(dev)) {
1302			dev_warn(&dev->dev, "hbm: start: version mismatch - stopping the driver.\n");
1303
1304			dev->hbm_state = MEI_HBM_STOPPED;
1305			if (mei_hbm_stop_req(dev)) {
1306				dev_err(&dev->dev, "hbm: start: failed to send stop request\n");
1307				return -EIO;
1308			}
1309			break;
1310		}
1311
1312		mei_hbm_config_features(dev);
1313
1314		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1315		    dev->hbm_state != MEI_HBM_STARTING) {
1316			if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1317			    dev->dev_state == MEI_DEV_POWERING_DOWN) {
1318				dev_dbg(&dev->dev, "hbm: start: on shutdown, ignoring\n");
1319				return 0;
1320			}
1321			dev_err(&dev->dev, "hbm: start: state mismatch, [%d, %d]\n",
1322				dev->dev_state, dev->hbm_state);
1323			return -EPROTO;
1324		}
1325
1326		if (dev->hbm_f_cap_supported) {
1327			if (mei_hbm_capabilities_req(dev))
1328				return -EIO;
1329			wake_up(&dev->wait_hbm_start);
1330			break;
1331		}
1332
1333		if (dev->hbm_f_dr_supported) {
1334			if (mei_dmam_ring_alloc(dev))
1335				dev_info(&dev->dev, "running w/o dma ring\n");
1336			if (mei_dma_ring_is_allocated(dev)) {
1337				if (mei_hbm_dma_setup_req(dev))
1338					return -EIO;
1339
1340				wake_up(&dev->wait_hbm_start);
1341				break;
1342			}
1343		}
1344
1345		dev->hbm_f_dr_supported = 0;
1346		mei_dmam_ring_free(dev);
1347
1348		if (mei_hbm_enum_clients_req(dev))
1349			return -EIO;
1350
1351		wake_up(&dev->wait_hbm_start);
1352		break;
1353
1354	case MEI_HBM_CAPABILITIES_RES_CMD:
1355		dev_dbg(&dev->dev, "hbm: capabilities response: message received.\n");
1356
1357		dev->init_clients_timer = 0;
1358
1359		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1360		    dev->hbm_state != MEI_HBM_CAP_SETUP) {
1361			if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1362			    dev->dev_state == MEI_DEV_POWERING_DOWN) {
1363				dev_dbg(&dev->dev, "hbm: capabilities response: on shutdown, ignoring\n");
1364				return 0;
1365			}
1366			dev_err(&dev->dev, "hbm: capabilities response: state mismatch, [%d, %d]\n",
1367				dev->dev_state, dev->hbm_state);
1368			return -EPROTO;
1369		}
1370
1371		capability_res = (struct hbm_capability_response *)mei_msg;
1372		if (!(capability_res->capability_granted[0] & HBM_CAP_VT))
1373			dev->hbm_f_vt_supported = 0;
1374		if (!(capability_res->capability_granted[0] & HBM_CAP_CD))
1375			dev->hbm_f_cd_supported = 0;
1376
1377		if (!(capability_res->capability_granted[0] & HBM_CAP_GSC))
1378			dev->hbm_f_gsc_supported = 0;
1379
1380		if (dev->hbm_f_dr_supported) {
1381			if (mei_dmam_ring_alloc(dev))
1382				dev_info(&dev->dev, "running w/o dma ring\n");
1383			if (mei_dma_ring_is_allocated(dev)) {
1384				if (mei_hbm_dma_setup_req(dev))
1385					return -EIO;
1386				break;
1387			}
1388		}
1389
1390		dev->hbm_f_dr_supported = 0;
1391		mei_dmam_ring_free(dev);
1392
1393		if (mei_hbm_enum_clients_req(dev))
1394			return -EIO;
1395		break;
1396
1397	case MEI_HBM_DMA_SETUP_RES_CMD:
1398		dev_dbg(&dev->dev, "hbm: dma setup response: message received.\n");
1399
1400		dev->init_clients_timer = 0;
1401
1402		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1403		    dev->hbm_state != MEI_HBM_DR_SETUP) {
1404			if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1405			    dev->dev_state == MEI_DEV_POWERING_DOWN) {
1406				dev_dbg(&dev->dev, "hbm: dma setup response: on shutdown, ignoring\n");
1407				return 0;
1408			}
1409			dev_err(&dev->dev, "hbm: dma setup response: state mismatch, [%d, %d]\n",
1410				dev->dev_state, dev->hbm_state);
1411			return -EPROTO;
1412		}
1413
1414		dma_setup_res = (struct hbm_dma_setup_response *)mei_msg;
1415
1416		if (dma_setup_res->status) {
1417			u8 status = dma_setup_res->status;
1418
1419			if (status == MEI_HBMS_NOT_ALLOWED) {
1420				dev_dbg(&dev->dev, "hbm: dma setup not allowed\n");
1421			} else {
1422				dev_info(&dev->dev, "hbm: dma setup response: failure = %d %s\n",
1423					 status,
1424					 mei_hbm_status_str(status));
1425			}
1426			dev->hbm_f_dr_supported = 0;
1427			mei_dmam_ring_free(dev);
1428		}
1429
1430		if (mei_hbm_enum_clients_req(dev))
1431			return -EIO;
1432		break;
1433
1434	case CLIENT_CONNECT_RES_CMD:
1435		dev_dbg(&dev->dev, "hbm: client connect response: message received.\n");
1436		mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_CONNECT);
1437		break;
1438
1439	case CLIENT_DISCONNECT_RES_CMD:
1440		dev_dbg(&dev->dev, "hbm: client disconnect response: message received.\n");
1441		mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_DISCONNECT);
1442		break;
1443
1444	case MEI_FLOW_CONTROL_CMD:
1445		dev_dbg(&dev->dev, "hbm: client flow control response: message received.\n");
1446
1447		fctrl = (struct hbm_flow_control *)mei_msg;
1448		mei_hbm_cl_tx_flow_ctrl_creds_res(dev, fctrl);
1449		break;
1450
1451	case MEI_PG_ISOLATION_ENTRY_RES_CMD:
1452		dev_dbg(&dev->dev, "hbm: power gate isolation entry response received\n");
1453		ret = mei_hbm_pg_enter_res(dev);
1454		if (ret)
1455			return ret;
1456		break;
1457
1458	case MEI_PG_ISOLATION_EXIT_REQ_CMD:
1459		dev_dbg(&dev->dev, "hbm: power gate isolation exit request received\n");
1460		ret = mei_hbm_pg_exit_res(dev);
1461		if (ret)
1462			return ret;
1463		break;
1464
1465	case HOST_CLIENT_PROPERTIES_RES_CMD:
1466		dev_dbg(&dev->dev, "hbm: properties response: message received.\n");
1467
1468		dev->init_clients_timer = 0;
1469
1470		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1471		    dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
1472			if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1473			    dev->dev_state == MEI_DEV_POWERING_DOWN) {
1474				dev_dbg(&dev->dev, "hbm: properties response: on shutdown, ignoring\n");
1475				return 0;
1476			}
1477			dev_err(&dev->dev, "hbm: properties response: state mismatch, [%d, %d]\n",
1478				dev->dev_state, dev->hbm_state);
1479			return -EPROTO;
1480		}
1481
1482		props_res = (struct hbm_props_response *)mei_msg;
1483
1484		if (props_res->status == MEI_HBMS_CLIENT_NOT_FOUND) {
1485			dev_dbg(&dev->dev, "hbm: properties response: %d CLIENT_NOT_FOUND\n",
1486				props_res->me_addr);
1487		} else if (props_res->status) {
1488			dev_err(&dev->dev, "hbm: properties response: wrong status = %d %s\n",
1489				props_res->status,
1490				mei_hbm_status_str(props_res->status));
1491			return -EPROTO;
1492		} else {
1493			mei_hbm_me_cl_add(dev, props_res);
1494		}
1495
1496		/* request property for the next client */
1497		if (mei_hbm_prop_req(dev, props_res->me_addr + 1))
1498			return -EIO;
1499
1500		break;
1501
1502	case HOST_ENUM_RES_CMD:
1503		dev_dbg(&dev->dev, "hbm: enumeration response: message received\n");
1504
1505		dev->init_clients_timer = 0;
1506
1507		enum_res = (struct hbm_host_enum_response *) mei_msg;
1508		BUILD_BUG_ON(sizeof(dev->me_clients_map)
1509				< sizeof(enum_res->valid_addresses));
1510		memcpy(dev->me_clients_map, enum_res->valid_addresses,
1511				sizeof(enum_res->valid_addresses));
1512
1513		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
1514		    dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
1515			if (dev->dev_state == MEI_DEV_POWER_DOWN ||
1516			    dev->dev_state == MEI_DEV_POWERING_DOWN) {
1517				dev_dbg(&dev->dev, "hbm: enumeration response: on shutdown, ignoring\n");
1518				return 0;
1519			}
1520			dev_err(&dev->dev, "hbm: enumeration response: state mismatch, [%d, %d]\n",
1521				dev->dev_state, dev->hbm_state);
1522			return -EPROTO;
1523		}
1524
1525		dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
1526
1527		/* first property request */
1528		if (mei_hbm_prop_req(dev, 0))
1529			return -EIO;
1530
1531		break;
1532
1533	case HOST_STOP_RES_CMD:
1534		dev_dbg(&dev->dev, "hbm: stop response: message received\n");
1535
1536		dev->init_clients_timer = 0;
1537
1538		if (dev->hbm_state != MEI_HBM_STOPPED) {
1539			dev_err(&dev->dev, "hbm: stop response: state mismatch, [%d, %d]\n",
1540				dev->dev_state, dev->hbm_state);
1541			return -EPROTO;
1542		}
1543
1544		mei_set_devstate(dev, MEI_DEV_POWER_DOWN);
1545		dev_info(&dev->dev, "hbm: stop response: resetting.\n");
1546		/* force the reset */
1547		return -EPROTO;
1548
1549	case CLIENT_DISCONNECT_REQ_CMD:
1550		dev_dbg(&dev->dev, "hbm: disconnect request: message received\n");
1551
1552		disconnect_req = (struct hbm_client_connect_request *)mei_msg;
1553		mei_hbm_fw_disconnect_req(dev, disconnect_req);
1554		break;
1555
1556	case ME_STOP_REQ_CMD:
1557		dev_dbg(&dev->dev, "hbm: stop request: message received\n");
1558		dev->hbm_state = MEI_HBM_STOPPED;
1559		if (mei_hbm_stop_req(dev)) {
1560			dev_err(&dev->dev, "hbm: stop request: failed to send stop request\n");
1561			return -EIO;
1562		}
1563		break;
1564
1565	case MEI_HBM_ADD_CLIENT_REQ_CMD:
1566		dev_dbg(&dev->dev, "hbm: add client request received\n");
1567		/*
1568		 * after the host receives the enum_resp
1569		 * message clients may be added or removed
1570		 */
1571		if (dev->hbm_state <= MEI_HBM_ENUM_CLIENTS ||
1572		    dev->hbm_state >= MEI_HBM_STOPPED) {
1573			dev_err(&dev->dev, "hbm: add client: state mismatch, [%d, %d]\n",
1574				dev->dev_state, dev->hbm_state);
1575			return -EPROTO;
1576		}
1577		add_cl_req = (struct hbm_add_client_request *)mei_msg;
1578		ret = mei_hbm_fw_add_cl_req(dev, add_cl_req);
1579		if (ret) {
1580			dev_err(&dev->dev, "hbm: add client: failed to send response %d\n",
1581				ret);
1582			return -EIO;
1583		}
1584		dev_dbg(&dev->dev, "hbm: add client request processed\n");
1585		break;
1586
1587	case MEI_HBM_NOTIFY_RES_CMD:
1588		dev_dbg(&dev->dev, "hbm: notify response received\n");
1589		mei_hbm_cl_res(dev, cl_cmd, notify_res_to_fop(cl_cmd));
1590		break;
1591
1592	case MEI_HBM_NOTIFICATION_CMD:
1593		dev_dbg(&dev->dev, "hbm: notification\n");
1594		mei_hbm_cl_notify(dev, cl_cmd);
1595		break;
1596
1597	case MEI_HBM_CLIENT_DMA_MAP_RES_CMD:
1598		dev_dbg(&dev->dev, "hbm: client dma map response: message received.\n");
1599		client_dma_res = (struct hbm_client_dma_response *)mei_msg;
1600		mei_hbm_cl_dma_map_res(dev, client_dma_res);
1601		break;
1602
1603	case MEI_HBM_CLIENT_DMA_UNMAP_RES_CMD:
1604		dev_dbg(&dev->dev, "hbm: client dma unmap response: message received.\n");
1605		client_dma_res = (struct hbm_client_dma_response *)mei_msg;
1606		mei_hbm_cl_dma_unmap_res(dev, client_dma_res);
1607		break;
1608
1609	default:
1610		WARN(1, "hbm: wrong command %d\n", mei_msg->hbm_cmd);
1611		return -EPROTO;
1612
1613	}
1614	return 0;
1615}
1616