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