1/* 2 * 3 * Intel Management Engine Interface (Intel MEI) Linux driver 4 * Copyright (c) 2003-2012, Intel Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 */ 16 17#include <linux/pci.h> 18#include <linux/sched.h> 19#include <linux/wait.h> 20#include <linux/delay.h> 21 22#include "mei_dev.h" 23#include "hw.h" 24#include "interface.h" 25#include "mei.h" 26 27const uuid_le mei_amthi_guid = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d, 0xac, 28 0xa8, 0x46, 0xe0, 0xff, 0x65, 29 0x81, 0x4c); 30 31/** 32 * mei_io_list_init - Sets up a queue list. 33 * 34 * @list: An instance io list structure 35 * @dev: the device structure 36 */ 37void mei_io_list_init(struct mei_io_list *list) 38{ 39 /* initialize our queue list */ 40 INIT_LIST_HEAD(&list->mei_cb.cb_list); 41} 42 43/** 44 * mei_io_list_flush - removes list entry belonging to cl. 45 * 46 * @list: An instance of our list structure 47 * @cl: private data of the file object 48 */ 49void mei_io_list_flush(struct mei_io_list *list, struct mei_cl *cl) 50{ 51 struct mei_cl_cb *pos; 52 struct mei_cl_cb *next; 53 54 list_for_each_entry_safe(pos, next, &list->mei_cb.cb_list, cb_list) { 55 if (pos->file_private) { 56 struct mei_cl *cl_tmp; 57 cl_tmp = (struct mei_cl *)pos->file_private; 58 if (mei_cl_cmp_id(cl, cl_tmp)) 59 list_del(&pos->cb_list); 60 } 61 } 62} 63/** 64 * mei_cl_flush_queues - flushes queue lists belonging to cl. 65 * 66 * @dev: the device structure 67 * @cl: private data of the file object 68 */ 69int mei_cl_flush_queues(struct mei_cl *cl) 70{ 71 if (!cl || !cl->dev) 72 return -EINVAL; 73 74 dev_dbg(&cl->dev->pdev->dev, "remove list entry belonging to cl\n"); 75 mei_io_list_flush(&cl->dev->read_list, cl); 76 mei_io_list_flush(&cl->dev->write_list, cl); 77 mei_io_list_flush(&cl->dev->write_waiting_list, cl); 78 mei_io_list_flush(&cl->dev->ctrl_wr_list, cl); 79 mei_io_list_flush(&cl->dev->ctrl_rd_list, cl); 80 mei_io_list_flush(&cl->dev->amthi_cmd_list, cl); 81 mei_io_list_flush(&cl->dev->amthi_read_complete_list, cl); 82 return 0; 83} 84 85 86 87/** 88 * mei_reset_iamthif_params - initializes mei device iamthif 89 * 90 * @dev: the device structure 91 */ 92static void mei_reset_iamthif_params(struct mei_device *dev) 93{ 94 /* reset iamthif parameters. */ 95 dev->iamthif_current_cb = NULL; 96 dev->iamthif_msg_buf_size = 0; 97 dev->iamthif_msg_buf_index = 0; 98 dev->iamthif_canceled = false; 99 dev->iamthif_ioctl = false; 100 dev->iamthif_state = MEI_IAMTHIF_IDLE; 101 dev->iamthif_timer = 0; 102} 103 104/** 105 * init_mei_device - allocates and initializes the mei device structure 106 * 107 * @pdev: The pci device structure 108 * 109 * returns The mei_device_device pointer on success, NULL on failure. 110 */ 111struct mei_device *mei_device_init(struct pci_dev *pdev) 112{ 113 struct mei_device *dev; 114 115 dev = kzalloc(sizeof(struct mei_device), GFP_KERNEL); 116 if (!dev) 117 return NULL; 118 119 /* setup our list array */ 120 INIT_LIST_HEAD(&dev->file_list); 121 INIT_LIST_HEAD(&dev->wd_cl.link); 122 INIT_LIST_HEAD(&dev->iamthif_cl.link); 123 mutex_init(&dev->device_lock); 124 init_waitqueue_head(&dev->wait_recvd_msg); 125 init_waitqueue_head(&dev->wait_stop_wd); 126 dev->mei_state = MEI_INITIALIZING; 127 dev->iamthif_state = MEI_IAMTHIF_IDLE; 128 dev->wd_interface_reg = false; 129 130 131 mei_io_list_init(&dev->read_list); 132 mei_io_list_init(&dev->write_list); 133 mei_io_list_init(&dev->write_waiting_list); 134 mei_io_list_init(&dev->ctrl_wr_list); 135 mei_io_list_init(&dev->ctrl_rd_list); 136 mei_io_list_init(&dev->amthi_cmd_list); 137 mei_io_list_init(&dev->amthi_read_complete_list); 138 dev->pdev = pdev; 139 return dev; 140} 141 142/** 143 * mei_hw_init - initializes host and fw to start work. 144 * 145 * @dev: the device structure 146 * 147 * returns 0 on success, <0 on failure. 148 */ 149int mei_hw_init(struct mei_device *dev) 150{ 151 int err = 0; 152 int ret; 153 154 mutex_lock(&dev->device_lock); 155 156 dev->host_hw_state = mei_hcsr_read(dev); 157 dev->me_hw_state = mei_mecsr_read(dev); 158 dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, mestate = 0x%08x.\n", 159 dev->host_hw_state, dev->me_hw_state); 160 161 /* acknowledge interrupt and stop interupts */ 162 if ((dev->host_hw_state & H_IS) == H_IS) 163 mei_reg_write(dev, H_CSR, dev->host_hw_state); 164 165 dev->recvd_msg = false; 166 dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n"); 167 168 mei_reset(dev, 1); 169 170 dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n", 171 dev->host_hw_state, dev->me_hw_state); 172 173 /* wait for ME to turn on ME_RDY */ 174 if (!dev->recvd_msg) { 175 mutex_unlock(&dev->device_lock); 176 err = wait_event_interruptible_timeout(dev->wait_recvd_msg, 177 dev->recvd_msg, MEI_INTEROP_TIMEOUT); 178 mutex_lock(&dev->device_lock); 179 } 180 181 if (err <= 0 && !dev->recvd_msg) { 182 dev->mei_state = MEI_DISABLED; 183 dev_dbg(&dev->pdev->dev, 184 "wait_event_interruptible_timeout failed" 185 "on wait for ME to turn on ME_RDY.\n"); 186 ret = -ENODEV; 187 goto out; 188 } 189 190 if (!(((dev->host_hw_state & H_RDY) == H_RDY) && 191 ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA))) { 192 dev->mei_state = MEI_DISABLED; 193 dev_dbg(&dev->pdev->dev, 194 "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n", 195 dev->host_hw_state, dev->me_hw_state); 196 197 if (!(dev->host_hw_state & H_RDY)) 198 dev_dbg(&dev->pdev->dev, "host turn off H_RDY.\n"); 199 200 if (!(dev->me_hw_state & ME_RDY_HRA)) 201 dev_dbg(&dev->pdev->dev, "ME turn off ME_RDY.\n"); 202 203 printk(KERN_ERR "mei: link layer initialization failed.\n"); 204 ret = -ENODEV; 205 goto out; 206 } 207 208 if (dev->version.major_version != HBM_MAJOR_VERSION || 209 dev->version.minor_version != HBM_MINOR_VERSION) { 210 dev_dbg(&dev->pdev->dev, "MEI start failed.\n"); 211 ret = -ENODEV; 212 goto out; 213 } 214 215 dev->recvd_msg = false; 216 dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n", 217 dev->host_hw_state, dev->me_hw_state); 218 dev_dbg(&dev->pdev->dev, "ME turn on ME_RDY and host turn on H_RDY.\n"); 219 dev_dbg(&dev->pdev->dev, "link layer has been established.\n"); 220 dev_dbg(&dev->pdev->dev, "MEI start success.\n"); 221 ret = 0; 222 223out: 224 mutex_unlock(&dev->device_lock); 225 return ret; 226} 227 228/** 229 * mei_hw_reset - resets fw via mei csr register. 230 * 231 * @dev: the device structure 232 * @interrupts_enabled: if interrupt should be enabled after reset. 233 */ 234static void mei_hw_reset(struct mei_device *dev, int interrupts_enabled) 235{ 236 dev->host_hw_state |= (H_RST | H_IG); 237 238 if (interrupts_enabled) 239 mei_enable_interrupts(dev); 240 else 241 mei_disable_interrupts(dev); 242} 243 244/** 245 * mei_reset - resets host and fw. 246 * 247 * @dev: the device structure 248 * @interrupts_enabled: if interrupt should be enabled after reset. 249 */ 250void mei_reset(struct mei_device *dev, int interrupts_enabled) 251{ 252 struct mei_cl *cl_pos = NULL; 253 struct mei_cl *cl_next = NULL; 254 struct mei_cl_cb *cb_pos = NULL; 255 struct mei_cl_cb *cb_next = NULL; 256 bool unexpected; 257 258 if (dev->mei_state == MEI_RECOVERING_FROM_RESET) { 259 dev->need_reset = true; 260 return; 261 } 262 263 unexpected = (dev->mei_state != MEI_INITIALIZING && 264 dev->mei_state != MEI_DISABLED && 265 dev->mei_state != MEI_POWER_DOWN && 266 dev->mei_state != MEI_POWER_UP); 267 268 dev->host_hw_state = mei_hcsr_read(dev); 269 270 dev_dbg(&dev->pdev->dev, "before reset host_hw_state = 0x%08x.\n", 271 dev->host_hw_state); 272 273 mei_hw_reset(dev, interrupts_enabled); 274 275 dev->host_hw_state &= ~H_RST; 276 dev->host_hw_state |= H_IG; 277 278 mei_hcsr_set(dev); 279 280 dev_dbg(&dev->pdev->dev, "currently saved host_hw_state = 0x%08x.\n", 281 dev->host_hw_state); 282 283 dev->need_reset = false; 284 285 if (dev->mei_state != MEI_INITIALIZING) { 286 if (dev->mei_state != MEI_DISABLED && 287 dev->mei_state != MEI_POWER_DOWN) 288 dev->mei_state = MEI_RESETING; 289 290 list_for_each_entry_safe(cl_pos, 291 cl_next, &dev->file_list, link) { 292 cl_pos->state = MEI_FILE_DISCONNECTED; 293 cl_pos->mei_flow_ctrl_creds = 0; 294 cl_pos->read_cb = NULL; 295 cl_pos->timer_count = 0; 296 } 297 /* remove entry if already in list */ 298 dev_dbg(&dev->pdev->dev, "list del iamthif and wd file list.\n"); 299 mei_remove_client_from_file_list(dev, 300 dev->wd_cl.host_client_id); 301 302 mei_remove_client_from_file_list(dev, 303 dev->iamthif_cl.host_client_id); 304 305 mei_reset_iamthif_params(dev); 306 dev->wd_due_counter = 0; 307 dev->extra_write_index = 0; 308 } 309 310 dev->me_clients_num = 0; 311 dev->rd_msg_hdr = 0; 312 dev->stop = false; 313 dev->wd_pending = false; 314 315 /* update the state of the registers after reset */ 316 dev->host_hw_state = mei_hcsr_read(dev); 317 dev->me_hw_state = mei_mecsr_read(dev); 318 319 dev_dbg(&dev->pdev->dev, "after reset host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n", 320 dev->host_hw_state, dev->me_hw_state); 321 322 if (unexpected) 323 dev_warn(&dev->pdev->dev, "unexpected reset.\n"); 324 325 /* Wake up all readings so they can be interrupted */ 326 list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) { 327 if (waitqueue_active(&cl_pos->rx_wait)) { 328 dev_dbg(&dev->pdev->dev, "Waking up client!\n"); 329 wake_up_interruptible(&cl_pos->rx_wait); 330 } 331 } 332 /* remove all waiting requests */ 333 list_for_each_entry_safe(cb_pos, cb_next, 334 &dev->write_list.mei_cb.cb_list, cb_list) { 335 list_del(&cb_pos->cb_list); 336 mei_free_cb_private(cb_pos); 337 } 338} 339 340 341 342/** 343 * host_start_message - mei host sends start message. 344 * 345 * @dev: the device structure 346 * 347 * returns none. 348 */ 349void mei_host_start_message(struct mei_device *dev) 350{ 351 struct mei_msg_hdr *mei_hdr; 352 struct hbm_host_version_request *host_start_req; 353 354 /* host start message */ 355 mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0]; 356 mei_hdr->host_addr = 0; 357 mei_hdr->me_addr = 0; 358 mei_hdr->length = sizeof(struct hbm_host_version_request); 359 mei_hdr->msg_complete = 1; 360 mei_hdr->reserved = 0; 361 362 host_start_req = 363 (struct hbm_host_version_request *) &dev->wr_msg_buf[1]; 364 memset(host_start_req, 0, sizeof(struct hbm_host_version_request)); 365 host_start_req->hbm_cmd = HOST_START_REQ_CMD; 366 host_start_req->host_version.major_version = HBM_MAJOR_VERSION; 367 host_start_req->host_version.minor_version = HBM_MINOR_VERSION; 368 dev->recvd_msg = false; 369 if (mei_write_message(dev, mei_hdr, (unsigned char *)host_start_req, 370 mei_hdr->length)) { 371 dev_dbg(&dev->pdev->dev, "write send version message to FW fail.\n"); 372 dev->mei_state = MEI_RESETING; 373 mei_reset(dev, 1); 374 } 375 dev->init_clients_state = MEI_START_MESSAGE; 376 dev->init_clients_timer = INIT_CLIENTS_TIMEOUT; 377 return ; 378} 379 380/** 381 * host_enum_clients_message - host sends enumeration client request message. 382 * 383 * @dev: the device structure 384 * 385 * returns none. 386 */ 387void mei_host_enum_clients_message(struct mei_device *dev) 388{ 389 struct mei_msg_hdr *mei_hdr; 390 struct hbm_host_enum_request *host_enum_req; 391 mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0]; 392 /* enumerate clients */ 393 mei_hdr->host_addr = 0; 394 mei_hdr->me_addr = 0; 395 mei_hdr->length = sizeof(struct hbm_host_enum_request); 396 mei_hdr->msg_complete = 1; 397 mei_hdr->reserved = 0; 398 399 host_enum_req = (struct hbm_host_enum_request *) &dev->wr_msg_buf[1]; 400 memset(host_enum_req, 0, sizeof(struct hbm_host_enum_request)); 401 host_enum_req->hbm_cmd = HOST_ENUM_REQ_CMD; 402 if (mei_write_message(dev, mei_hdr, (unsigned char *)host_enum_req, 403 mei_hdr->length)) { 404 dev->mei_state = MEI_RESETING; 405 dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n"); 406 mei_reset(dev, 1); 407 } 408 dev->init_clients_state = MEI_ENUM_CLIENTS_MESSAGE; 409 dev->init_clients_timer = INIT_CLIENTS_TIMEOUT; 410 return; 411} 412 413 414/** 415 * allocate_me_clients_storage - allocates storage for me clients 416 * 417 * @dev: the device structure 418 * 419 * returns none. 420 */ 421void mei_allocate_me_clients_storage(struct mei_device *dev) 422{ 423 struct mei_me_client *clients; 424 int b; 425 426 /* count how many ME clients we have */ 427 for_each_set_bit(b, dev->me_clients_map, MEI_CLIENTS_MAX) 428 dev->me_clients_num++; 429 430 if (dev->me_clients_num <= 0) 431 return ; 432 433 434 if (dev->me_clients != NULL) { 435 kfree(dev->me_clients); 436 dev->me_clients = NULL; 437 } 438 dev_dbg(&dev->pdev->dev, "memory allocation for ME clients size=%zd.\n", 439 dev->me_clients_num * sizeof(struct mei_me_client)); 440 /* allocate storage for ME clients representation */ 441 clients = kcalloc(dev->me_clients_num, 442 sizeof(struct mei_me_client), GFP_KERNEL); 443 if (!clients) { 444 dev_dbg(&dev->pdev->dev, "memory allocation for ME clients failed.\n"); 445 dev->mei_state = MEI_RESETING; 446 mei_reset(dev, 1); 447 return ; 448 } 449 dev->me_clients = clients; 450 return ; 451} 452/** 453 * host_client_properties - reads properties for client 454 * 455 * @dev: the device structure 456 * 457 * returns: 458 * < 0 - Error. 459 * = 0 - no more clients. 460 * = 1 - still have clients to send properties request. 461 */ 462int mei_host_client_properties(struct mei_device *dev) 463{ 464 struct mei_msg_hdr *mei_header; 465 struct hbm_props_request *host_cli_req; 466 int b; 467 u8 client_num = dev->me_client_presentation_num; 468 469 b = dev->me_client_index; 470 b = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, b); 471 if (b < MEI_CLIENTS_MAX) { 472 dev->me_clients[client_num].client_id = b; 473 dev->me_clients[client_num].mei_flow_ctrl_creds = 0; 474 mei_header = (struct mei_msg_hdr *)&dev->wr_msg_buf[0]; 475 mei_header->host_addr = 0; 476 mei_header->me_addr = 0; 477 mei_header->length = sizeof(struct hbm_props_request); 478 mei_header->msg_complete = 1; 479 mei_header->reserved = 0; 480 481 host_cli_req = (struct hbm_props_request *)&dev->wr_msg_buf[1]; 482 483 memset(host_cli_req, 0, sizeof(struct hbm_props_request)); 484 485 host_cli_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD; 486 host_cli_req->address = b; 487 488 if (mei_write_message(dev, mei_header, 489 (unsigned char *)host_cli_req, 490 mei_header->length)) { 491 dev->mei_state = MEI_RESETING; 492 dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n"); 493 mei_reset(dev, 1); 494 return -EIO; 495 } 496 497 dev->init_clients_timer = INIT_CLIENTS_TIMEOUT; 498 dev->me_client_index = b; 499 return 1; 500 } 501 502 return 0; 503} 504 505/** 506 * mei_init_file_private - initializes private file structure. 507 * 508 * @priv: private file structure to be initialized 509 * @file: the file structure 510 */ 511void mei_cl_init(struct mei_cl *priv, struct mei_device *dev) 512{ 513 memset(priv, 0, sizeof(struct mei_cl)); 514 init_waitqueue_head(&priv->wait); 515 init_waitqueue_head(&priv->rx_wait); 516 init_waitqueue_head(&priv->tx_wait); 517 INIT_LIST_HEAD(&priv->link); 518 priv->reading_state = MEI_IDLE; 519 priv->writing_state = MEI_IDLE; 520 priv->dev = dev; 521} 522 523int mei_find_me_client_index(const struct mei_device *dev, uuid_le cuuid) 524{ 525 int i, res = -1; 526 527 for (i = 0; i < dev->me_clients_num; ++i) 528 if (uuid_le_cmp(cuuid, 529 dev->me_clients[i].props.protocol_name) == 0) { 530 res = i; 531 break; 532 } 533 534 return res; 535} 536 537 538/** 539 * mei_find_me_client_update_filext - searches for ME client guid 540 * sets client_id in mei_file_private if found 541 * @dev: the device structure 542 * @priv: private file structure to set client_id in 543 * @cguid: searched guid of ME client 544 * @client_id: id of host client to be set in file private structure 545 * 546 * returns ME client index 547 */ 548u8 mei_find_me_client_update_filext(struct mei_device *dev, struct mei_cl *priv, 549 const uuid_le *cguid, u8 client_id) 550{ 551 int i; 552 553 if (!dev || !priv || !cguid) 554 return 0; 555 556 /* check for valid client id */ 557 i = mei_find_me_client_index(dev, *cguid); 558 if (i >= 0) { 559 priv->me_client_id = dev->me_clients[i].client_id; 560 priv->state = MEI_FILE_CONNECTING; 561 priv->host_client_id = client_id; 562 563 list_add_tail(&priv->link, &dev->file_list); 564 return (u8)i; 565 } 566 567 return 0; 568} 569 570/** 571 * host_init_iamthif - mei initialization iamthif client. 572 * 573 * @dev: the device structure 574 * 575 */ 576void mei_host_init_iamthif(struct mei_device *dev) 577{ 578 u8 i; 579 unsigned char *msg_buf; 580 581 mei_cl_init(&dev->iamthif_cl, dev); 582 dev->iamthif_cl.state = MEI_FILE_DISCONNECTED; 583 584 /* find ME amthi client */ 585 i = mei_find_me_client_update_filext(dev, &dev->iamthif_cl, 586 &mei_amthi_guid, MEI_IAMTHIF_HOST_CLIENT_ID); 587 if (dev->iamthif_cl.state != MEI_FILE_CONNECTING) { 588 dev_dbg(&dev->pdev->dev, "failed to find iamthif client.\n"); 589 return; 590 } 591 592 /* Assign iamthif_mtu to the value received from ME */ 593 594 dev->iamthif_mtu = dev->me_clients[i].props.max_msg_length; 595 dev_dbg(&dev->pdev->dev, "IAMTHIF_MTU = %d\n", 596 dev->me_clients[i].props.max_msg_length); 597 598 kfree(dev->iamthif_msg_buf); 599 dev->iamthif_msg_buf = NULL; 600 601 /* allocate storage for ME message buffer */ 602 msg_buf = kcalloc(dev->iamthif_mtu, 603 sizeof(unsigned char), GFP_KERNEL); 604 if (!msg_buf) { 605 dev_dbg(&dev->pdev->dev, "memory allocation for ME message buffer failed.\n"); 606 return; 607 } 608 609 dev->iamthif_msg_buf = msg_buf; 610 611 if (mei_connect(dev, &dev->iamthif_cl)) { 612 dev_dbg(&dev->pdev->dev, "Failed to connect to AMTHI client\n"); 613 dev->iamthif_cl.state = MEI_FILE_DISCONNECTED; 614 dev->iamthif_cl.host_client_id = 0; 615 } else { 616 dev->iamthif_cl.timer_count = CONNECT_TIMEOUT; 617 } 618} 619 620/** 621 * mei_alloc_file_private - allocates a private file structure and sets it up. 622 * @file: the file structure 623 * 624 * returns The allocated file or NULL on failure 625 */ 626struct mei_cl *mei_cl_allocate(struct mei_device *dev) 627{ 628 struct mei_cl *cl; 629 630 cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL); 631 if (!cl) 632 return NULL; 633 634 mei_cl_init(cl, dev); 635 636 return cl; 637} 638 639 640 641/** 642 * mei_disconnect_host_client - sends disconnect message to fw from host client. 643 * 644 * @dev: the device structure 645 * @cl: private data of the file object 646 * 647 * Locking: called under "dev->device_lock" lock 648 * 649 * returns 0 on success, <0 on failure. 650 */ 651int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *cl) 652{ 653 int rets, err; 654 long timeout = 15; /* 15 seconds */ 655 struct mei_cl_cb *cb; 656 657 if (!dev || !cl) 658 return -ENODEV; 659 660 if (cl->state != MEI_FILE_DISCONNECTING) 661 return 0; 662 663 cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL); 664 if (!cb) 665 return -ENOMEM; 666 667 INIT_LIST_HEAD(&cb->cb_list); 668 cb->file_private = cl; 669 cb->major_file_operations = MEI_CLOSE; 670 if (dev->mei_host_buffer_is_empty) { 671 dev->mei_host_buffer_is_empty = false; 672 if (mei_disconnect(dev, cl)) { 673 rets = -ENODEV; 674 dev_dbg(&dev->pdev->dev, "failed to call mei_disconnect.\n"); 675 goto free; 676 } 677 mdelay(10); /* Wait for hardware disconnection ready */ 678 list_add_tail(&cb->cb_list, &dev->ctrl_rd_list.mei_cb.cb_list); 679 } else { 680 dev_dbg(&dev->pdev->dev, "add disconnect cb to control write list\n"); 681 list_add_tail(&cb->cb_list, 682 &dev->ctrl_wr_list.mei_cb.cb_list); 683 } 684 mutex_unlock(&dev->device_lock); 685 686 err = wait_event_timeout(dev->wait_recvd_msg, 687 (MEI_FILE_DISCONNECTED == cl->state), 688 timeout * HZ); 689 690 mutex_lock(&dev->device_lock); 691 if (MEI_FILE_DISCONNECTED == cl->state) { 692 rets = 0; 693 dev_dbg(&dev->pdev->dev, "successfully disconnected from FW client.\n"); 694 } else { 695 rets = -ENODEV; 696 if (MEI_FILE_DISCONNECTED != cl->state) 697 dev_dbg(&dev->pdev->dev, "wrong status client disconnect.\n"); 698 699 if (err) 700 dev_dbg(&dev->pdev->dev, 701 "wait failed disconnect err=%08x\n", 702 err); 703 704 dev_dbg(&dev->pdev->dev, "failed to disconnect from FW client.\n"); 705 } 706 707 mei_io_list_flush(&dev->ctrl_rd_list, cl); 708 mei_io_list_flush(&dev->ctrl_wr_list, cl); 709free: 710 mei_free_cb_private(cb); 711 return rets; 712} 713 714/** 715 * mei_remove_client_from_file_list - 716 * removes file private data from device file list 717 * 718 * @dev: the device structure 719 * @host_client_id: host client id to be removed 720 */ 721void mei_remove_client_from_file_list(struct mei_device *dev, 722 u8 host_client_id) 723{ 724 struct mei_cl *cl_pos = NULL; 725 struct mei_cl *cl_next = NULL; 726 list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) { 727 if (host_client_id == cl_pos->host_client_id) { 728 dev_dbg(&dev->pdev->dev, "remove host client = %d, ME client = %d\n", 729 cl_pos->host_client_id, 730 cl_pos->me_client_id); 731 list_del_init(&cl_pos->link); 732 break; 733 } 734 } 735} 736