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/sched.h> 18#include <linux/wait.h> 19#include <linux/delay.h> 20#include <linux/slab.h> 21#include <linux/pm_runtime.h> 22 23#include <linux/mei.h> 24 25#include "mei_dev.h" 26#include "hbm.h" 27#include "client.h" 28 29/** 30 * mei_me_cl_by_uuid - locate me client by uuid 31 * 32 * @dev: mei device 33 * @uuid: me client uuid 34 * 35 * Locking: called under "dev->device_lock" lock 36 * 37 * Return: me client or NULL if not found 38 */ 39struct mei_me_client *mei_me_cl_by_uuid(const struct mei_device *dev, 40 const uuid_le *uuid) 41{ 42 struct mei_me_client *me_cl; 43 44 list_for_each_entry(me_cl, &dev->me_clients, list) 45 if (uuid_le_cmp(*uuid, me_cl->props.protocol_name) == 0) 46 return me_cl; 47 48 return NULL; 49} 50 51/** 52 * mei_me_cl_by_id - locate me client by client id 53 * 54 * @dev: the device structure 55 * @client_id: me client id 56 * 57 * Locking: called under "dev->device_lock" lock 58 * 59 * Return: me client or NULL if not found 60 */ 61struct mei_me_client *mei_me_cl_by_id(struct mei_device *dev, u8 client_id) 62{ 63 64 struct mei_me_client *me_cl; 65 66 list_for_each_entry(me_cl, &dev->me_clients, list) 67 if (me_cl->client_id == client_id) 68 return me_cl; 69 return NULL; 70} 71 72/** 73 * mei_me_cl_by_uuid_id - locate me client by client id and uuid 74 * 75 * @dev: the device structure 76 * @uuid: me client uuid 77 * @client_id: me client id 78 * 79 * Locking: called under "dev->device_lock" lock 80 * 81 * Return: me client or NULL if not found 82 */ 83struct mei_me_client *mei_me_cl_by_uuid_id(struct mei_device *dev, 84 const uuid_le *uuid, u8 client_id) 85{ 86 struct mei_me_client *me_cl; 87 88 list_for_each_entry(me_cl, &dev->me_clients, list) 89 if (uuid_le_cmp(*uuid, me_cl->props.protocol_name) == 0 && 90 me_cl->client_id == client_id) 91 return me_cl; 92 return NULL; 93} 94 95/** 96 * mei_me_cl_remove - remove me client matching uuid and client_id 97 * 98 * @dev: the device structure 99 * @uuid: me client uuid 100 * @client_id: me client address 101 */ 102void mei_me_cl_remove(struct mei_device *dev, const uuid_le *uuid, u8 client_id) 103{ 104 struct mei_me_client *me_cl, *next; 105 106 list_for_each_entry_safe(me_cl, next, &dev->me_clients, list) { 107 if (uuid_le_cmp(*uuid, me_cl->props.protocol_name) == 0 && 108 me_cl->client_id == client_id) { 109 list_del(&me_cl->list); 110 kfree(me_cl); 111 break; 112 } 113 } 114} 115 116 117/** 118 * mei_cl_cmp_id - tells if the clients are the same 119 * 120 * @cl1: host client 1 121 * @cl2: host client 2 122 * 123 * Return: true - if the clients has same host and me ids 124 * false - otherwise 125 */ 126static inline bool mei_cl_cmp_id(const struct mei_cl *cl1, 127 const struct mei_cl *cl2) 128{ 129 return cl1 && cl2 && 130 (cl1->host_client_id == cl2->host_client_id) && 131 (cl1->me_client_id == cl2->me_client_id); 132} 133 134/** 135 * mei_io_list_flush - removes cbs belonging to cl. 136 * 137 * @list: an instance of our list structure 138 * @cl: host client, can be NULL for flushing the whole list 139 * @free: whether to free the cbs 140 */ 141static void __mei_io_list_flush(struct mei_cl_cb *list, 142 struct mei_cl *cl, bool free) 143{ 144 struct mei_cl_cb *cb; 145 struct mei_cl_cb *next; 146 147 /* enable removing everything if no cl is specified */ 148 list_for_each_entry_safe(cb, next, &list->list, list) { 149 if (!cl || (cb->cl && mei_cl_cmp_id(cl, cb->cl))) { 150 list_del(&cb->list); 151 if (free) 152 mei_io_cb_free(cb); 153 } 154 } 155} 156 157/** 158 * mei_io_list_flush - removes list entry belonging to cl. 159 * 160 * @list: An instance of our list structure 161 * @cl: host client 162 */ 163void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl) 164{ 165 __mei_io_list_flush(list, cl, false); 166} 167 168 169/** 170 * mei_io_list_free - removes cb belonging to cl and free them 171 * 172 * @list: An instance of our list structure 173 * @cl: host client 174 */ 175static inline void mei_io_list_free(struct mei_cl_cb *list, struct mei_cl *cl) 176{ 177 __mei_io_list_flush(list, cl, true); 178} 179 180/** 181 * mei_io_cb_free - free mei_cb_private related memory 182 * 183 * @cb: mei callback struct 184 */ 185void mei_io_cb_free(struct mei_cl_cb *cb) 186{ 187 if (cb == NULL) 188 return; 189 190 kfree(cb->request_buffer.data); 191 kfree(cb->response_buffer.data); 192 kfree(cb); 193} 194 195/** 196 * mei_io_cb_init - allocate and initialize io callback 197 * 198 * @cl: mei client 199 * @fp: pointer to file structure 200 * 201 * Return: mei_cl_cb pointer or NULL; 202 */ 203struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp) 204{ 205 struct mei_cl_cb *cb; 206 207 cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL); 208 if (!cb) 209 return NULL; 210 211 mei_io_list_init(cb); 212 213 cb->file_object = fp; 214 cb->cl = cl; 215 cb->buf_idx = 0; 216 return cb; 217} 218 219/** 220 * mei_io_cb_alloc_req_buf - allocate request buffer 221 * 222 * @cb: io callback structure 223 * @length: size of the buffer 224 * 225 * Return: 0 on success 226 * -EINVAL if cb is NULL 227 * -ENOMEM if allocation failed 228 */ 229int mei_io_cb_alloc_req_buf(struct mei_cl_cb *cb, size_t length) 230{ 231 if (!cb) 232 return -EINVAL; 233 234 if (length == 0) 235 return 0; 236 237 cb->request_buffer.data = kmalloc(length, GFP_KERNEL); 238 if (!cb->request_buffer.data) 239 return -ENOMEM; 240 cb->request_buffer.size = length; 241 return 0; 242} 243/** 244 * mei_io_cb_alloc_resp_buf - allocate response buffer 245 * 246 * @cb: io callback structure 247 * @length: size of the buffer 248 * 249 * Return: 0 on success 250 * -EINVAL if cb is NULL 251 * -ENOMEM if allocation failed 252 */ 253int mei_io_cb_alloc_resp_buf(struct mei_cl_cb *cb, size_t length) 254{ 255 if (!cb) 256 return -EINVAL; 257 258 if (length == 0) 259 return 0; 260 261 cb->response_buffer.data = kmalloc(length, GFP_KERNEL); 262 if (!cb->response_buffer.data) 263 return -ENOMEM; 264 cb->response_buffer.size = length; 265 return 0; 266} 267 268 269 270/** 271 * mei_cl_flush_queues - flushes queue lists belonging to cl. 272 * 273 * @cl: host client 274 * 275 * Return: 0 on success, -EINVAL if cl or cl->dev is NULL. 276 */ 277int mei_cl_flush_queues(struct mei_cl *cl) 278{ 279 struct mei_device *dev; 280 281 if (WARN_ON(!cl || !cl->dev)) 282 return -EINVAL; 283 284 dev = cl->dev; 285 286 cl_dbg(dev, cl, "remove list entry belonging to cl\n"); 287 mei_io_list_flush(&cl->dev->read_list, cl); 288 mei_io_list_free(&cl->dev->write_list, cl); 289 mei_io_list_free(&cl->dev->write_waiting_list, cl); 290 mei_io_list_flush(&cl->dev->ctrl_wr_list, cl); 291 mei_io_list_flush(&cl->dev->ctrl_rd_list, cl); 292 mei_io_list_flush(&cl->dev->amthif_cmd_list, cl); 293 mei_io_list_flush(&cl->dev->amthif_rd_complete_list, cl); 294 return 0; 295} 296 297 298/** 299 * mei_cl_init - initializes cl. 300 * 301 * @cl: host client to be initialized 302 * @dev: mei device 303 */ 304void mei_cl_init(struct mei_cl *cl, struct mei_device *dev) 305{ 306 memset(cl, 0, sizeof(struct mei_cl)); 307 init_waitqueue_head(&cl->wait); 308 init_waitqueue_head(&cl->rx_wait); 309 init_waitqueue_head(&cl->tx_wait); 310 INIT_LIST_HEAD(&cl->link); 311 INIT_LIST_HEAD(&cl->device_link); 312 cl->reading_state = MEI_IDLE; 313 cl->writing_state = MEI_IDLE; 314 cl->dev = dev; 315} 316 317/** 318 * mei_cl_allocate - allocates cl structure and sets it up. 319 * 320 * @dev: mei device 321 * Return: The allocated file or NULL on failure 322 */ 323struct mei_cl *mei_cl_allocate(struct mei_device *dev) 324{ 325 struct mei_cl *cl; 326 327 cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL); 328 if (!cl) 329 return NULL; 330 331 mei_cl_init(cl, dev); 332 333 return cl; 334} 335 336/** 337 * mei_cl_find_read_cb - find this cl's callback in the read list 338 * 339 * @cl: host client 340 * 341 * Return: cb on success, NULL on error 342 */ 343struct mei_cl_cb *mei_cl_find_read_cb(struct mei_cl *cl) 344{ 345 struct mei_device *dev = cl->dev; 346 struct mei_cl_cb *cb; 347 348 list_for_each_entry(cb, &dev->read_list.list, list) 349 if (mei_cl_cmp_id(cl, cb->cl)) 350 return cb; 351 return NULL; 352} 353 354/** mei_cl_link: allocate host id in the host map 355 * 356 * @cl - host client 357 * @id - fixed host id or -1 for generic one 358 * 359 * Return: 0 on success 360 * -EINVAL on incorrect values 361 * -ENONET if client not found 362 */ 363int mei_cl_link(struct mei_cl *cl, int id) 364{ 365 struct mei_device *dev; 366 long open_handle_count; 367 368 if (WARN_ON(!cl || !cl->dev)) 369 return -EINVAL; 370 371 dev = cl->dev; 372 373 /* If Id is not assigned get one*/ 374 if (id == MEI_HOST_CLIENT_ID_ANY) 375 id = find_first_zero_bit(dev->host_clients_map, 376 MEI_CLIENTS_MAX); 377 378 if (id >= MEI_CLIENTS_MAX) { 379 dev_err(dev->dev, "id exceeded %d", MEI_CLIENTS_MAX); 380 return -EMFILE; 381 } 382 383 open_handle_count = dev->open_handle_count + dev->iamthif_open_count; 384 if (open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) { 385 dev_err(dev->dev, "open_handle_count exceeded %d", 386 MEI_MAX_OPEN_HANDLE_COUNT); 387 return -EMFILE; 388 } 389 390 dev->open_handle_count++; 391 392 cl->host_client_id = id; 393 list_add_tail(&cl->link, &dev->file_list); 394 395 set_bit(id, dev->host_clients_map); 396 397 cl->state = MEI_FILE_INITIALIZING; 398 399 cl_dbg(dev, cl, "link cl\n"); 400 return 0; 401} 402 403/** 404 * mei_cl_unlink - remove me_cl from the list 405 * 406 * @cl: host client 407 * 408 * Return: always 0 409 */ 410int mei_cl_unlink(struct mei_cl *cl) 411{ 412 struct mei_device *dev; 413 414 /* don't shout on error exit path */ 415 if (!cl) 416 return 0; 417 418 /* wd and amthif might not be initialized */ 419 if (!cl->dev) 420 return 0; 421 422 dev = cl->dev; 423 424 cl_dbg(dev, cl, "unlink client"); 425 426 if (dev->open_handle_count > 0) 427 dev->open_handle_count--; 428 429 /* never clear the 0 bit */ 430 if (cl->host_client_id) 431 clear_bit(cl->host_client_id, dev->host_clients_map); 432 433 list_del_init(&cl->link); 434 435 cl->state = MEI_FILE_INITIALIZING; 436 437 return 0; 438} 439 440 441void mei_host_client_init(struct work_struct *work) 442{ 443 struct mei_device *dev = container_of(work, 444 struct mei_device, init_work); 445 struct mei_me_client *me_cl; 446 struct mei_client_properties *props; 447 448 mutex_lock(&dev->device_lock); 449 450 list_for_each_entry(me_cl, &dev->me_clients, list) { 451 props = &me_cl->props; 452 453 if (!uuid_le_cmp(props->protocol_name, mei_amthif_guid)) 454 mei_amthif_host_init(dev); 455 else if (!uuid_le_cmp(props->protocol_name, mei_wd_guid)) 456 mei_wd_host_init(dev); 457 else if (!uuid_le_cmp(props->protocol_name, mei_nfc_guid)) 458 mei_nfc_host_init(dev); 459 460 } 461 462 dev->dev_state = MEI_DEV_ENABLED; 463 dev->reset_count = 0; 464 465 mutex_unlock(&dev->device_lock); 466 467 pm_runtime_mark_last_busy(dev->dev); 468 dev_dbg(dev->dev, "rpm: autosuspend\n"); 469 pm_runtime_autosuspend(dev->dev); 470} 471 472/** 473 * mei_hbuf_acquire - try to acquire host buffer 474 * 475 * @dev: the device structure 476 * Return: true if host buffer was acquired 477 */ 478bool mei_hbuf_acquire(struct mei_device *dev) 479{ 480 if (mei_pg_state(dev) == MEI_PG_ON || 481 dev->pg_event == MEI_PG_EVENT_WAIT) { 482 dev_dbg(dev->dev, "device is in pg\n"); 483 return false; 484 } 485 486 if (!dev->hbuf_is_ready) { 487 dev_dbg(dev->dev, "hbuf is not ready\n"); 488 return false; 489 } 490 491 dev->hbuf_is_ready = false; 492 493 return true; 494} 495 496/** 497 * mei_cl_disconnect - disconnect host client from the me one 498 * 499 * @cl: host client 500 * 501 * Locking: called under "dev->device_lock" lock 502 * 503 * Return: 0 on success, <0 on failure. 504 */ 505int mei_cl_disconnect(struct mei_cl *cl) 506{ 507 struct mei_device *dev; 508 struct mei_cl_cb *cb; 509 int rets; 510 511 if (WARN_ON(!cl || !cl->dev)) 512 return -ENODEV; 513 514 dev = cl->dev; 515 516 cl_dbg(dev, cl, "disconnecting"); 517 518 if (cl->state != MEI_FILE_DISCONNECTING) 519 return 0; 520 521 rets = pm_runtime_get(dev->dev); 522 if (rets < 0 && rets != -EINPROGRESS) { 523 pm_runtime_put_noidle(dev->dev); 524 cl_err(dev, cl, "rpm: get failed %d\n", rets); 525 return rets; 526 } 527 528 cb = mei_io_cb_init(cl, NULL); 529 if (!cb) { 530 rets = -ENOMEM; 531 goto free; 532 } 533 534 cb->fop_type = MEI_FOP_DISCONNECT; 535 536 if (mei_hbuf_acquire(dev)) { 537 if (mei_hbm_cl_disconnect_req(dev, cl)) { 538 rets = -ENODEV; 539 cl_err(dev, cl, "failed to disconnect.\n"); 540 goto free; 541 } 542 cl->timer_count = MEI_CONNECT_TIMEOUT; 543 mdelay(10); /* Wait for hardware disconnection ready */ 544 list_add_tail(&cb->list, &dev->ctrl_rd_list.list); 545 } else { 546 cl_dbg(dev, cl, "add disconnect cb to control write list\n"); 547 list_add_tail(&cb->list, &dev->ctrl_wr_list.list); 548 549 } 550 mutex_unlock(&dev->device_lock); 551 552 wait_event_timeout(cl->wait, 553 MEI_FILE_DISCONNECTED == cl->state, 554 mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); 555 556 mutex_lock(&dev->device_lock); 557 558 if (MEI_FILE_DISCONNECTED == cl->state) { 559 rets = 0; 560 cl_dbg(dev, cl, "successfully disconnected from FW client.\n"); 561 } else { 562 cl_dbg(dev, cl, "timeout on disconnect from FW client.\n"); 563 rets = -ETIME; 564 } 565 566 mei_io_list_flush(&dev->ctrl_rd_list, cl); 567 mei_io_list_flush(&dev->ctrl_wr_list, cl); 568free: 569 cl_dbg(dev, cl, "rpm: autosuspend\n"); 570 pm_runtime_mark_last_busy(dev->dev); 571 pm_runtime_put_autosuspend(dev->dev); 572 573 mei_io_cb_free(cb); 574 return rets; 575} 576 577 578/** 579 * mei_cl_is_other_connecting - checks if other 580 * client with the same me client id is connecting 581 * 582 * @cl: private data of the file object 583 * 584 * Return: true if other client is connected, false - otherwise. 585 */ 586bool mei_cl_is_other_connecting(struct mei_cl *cl) 587{ 588 struct mei_device *dev; 589 struct mei_cl *ocl; /* the other client */ 590 591 if (WARN_ON(!cl || !cl->dev)) 592 return false; 593 594 dev = cl->dev; 595 596 list_for_each_entry(ocl, &dev->file_list, link) { 597 if (ocl->state == MEI_FILE_CONNECTING && 598 ocl != cl && 599 cl->me_client_id == ocl->me_client_id) 600 return true; 601 602 } 603 604 return false; 605} 606 607/** 608 * mei_cl_connect - connect host client to the me one 609 * 610 * @cl: host client 611 * @file: pointer to file structure 612 * 613 * Locking: called under "dev->device_lock" lock 614 * 615 * Return: 0 on success, <0 on failure. 616 */ 617int mei_cl_connect(struct mei_cl *cl, struct file *file) 618{ 619 struct mei_device *dev; 620 struct mei_cl_cb *cb; 621 int rets; 622 623 if (WARN_ON(!cl || !cl->dev)) 624 return -ENODEV; 625 626 dev = cl->dev; 627 628 rets = pm_runtime_get(dev->dev); 629 if (rets < 0 && rets != -EINPROGRESS) { 630 pm_runtime_put_noidle(dev->dev); 631 cl_err(dev, cl, "rpm: get failed %d\n", rets); 632 return rets; 633 } 634 635 cb = mei_io_cb_init(cl, file); 636 if (!cb) { 637 rets = -ENOMEM; 638 goto out; 639 } 640 641 cb->fop_type = MEI_FOP_CONNECT; 642 643 /* run hbuf acquire last so we don't have to undo */ 644 if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) { 645 cl->state = MEI_FILE_CONNECTING; 646 if (mei_hbm_cl_connect_req(dev, cl)) { 647 rets = -ENODEV; 648 goto out; 649 } 650 cl->timer_count = MEI_CONNECT_TIMEOUT; 651 list_add_tail(&cb->list, &dev->ctrl_rd_list.list); 652 } else { 653 cl->state = MEI_FILE_INITIALIZING; 654 list_add_tail(&cb->list, &dev->ctrl_wr_list.list); 655 } 656 657 mutex_unlock(&dev->device_lock); 658 wait_event_timeout(cl->wait, 659 (cl->state == MEI_FILE_CONNECTED || 660 cl->state == MEI_FILE_DISCONNECTED), 661 mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); 662 mutex_lock(&dev->device_lock); 663 664 if (cl->state != MEI_FILE_CONNECTED) { 665 cl->state = MEI_FILE_DISCONNECTED; 666 /* something went really wrong */ 667 if (!cl->status) 668 cl->status = -EFAULT; 669 670 mei_io_list_flush(&dev->ctrl_rd_list, cl); 671 mei_io_list_flush(&dev->ctrl_wr_list, cl); 672 } 673 674 rets = cl->status; 675 676out: 677 cl_dbg(dev, cl, "rpm: autosuspend\n"); 678 pm_runtime_mark_last_busy(dev->dev); 679 pm_runtime_put_autosuspend(dev->dev); 680 681 mei_io_cb_free(cb); 682 return rets; 683} 684 685/** 686 * mei_cl_flow_ctrl_creds - checks flow_control credits for cl. 687 * 688 * @cl: private data of the file object 689 * 690 * Return: 1 if mei_flow_ctrl_creds >0, 0 - otherwise. 691 * -ENOENT if mei_cl is not present 692 * -EINVAL if single_recv_buf == 0 693 */ 694int mei_cl_flow_ctrl_creds(struct mei_cl *cl) 695{ 696 struct mei_device *dev; 697 struct mei_me_client *me_cl; 698 699 if (WARN_ON(!cl || !cl->dev)) 700 return -EINVAL; 701 702 dev = cl->dev; 703 704 if (cl->mei_flow_ctrl_creds > 0) 705 return 1; 706 707 me_cl = mei_me_cl_by_id(dev, cl->me_client_id); 708 if (!me_cl) { 709 cl_err(dev, cl, "no such me client %d\n", cl->me_client_id); 710 return -ENOENT; 711 } 712 713 if (me_cl->mei_flow_ctrl_creds) { 714 if (WARN_ON(me_cl->props.single_recv_buf == 0)) 715 return -EINVAL; 716 return 1; 717 } 718 return 0; 719} 720 721/** 722 * mei_cl_flow_ctrl_reduce - reduces flow_control. 723 * 724 * @cl: private data of the file object 725 * 726 * Return: 727 * 0 on success 728 * -ENOENT when me client is not found 729 * -EINVAL when ctrl credits are <= 0 730 */ 731int mei_cl_flow_ctrl_reduce(struct mei_cl *cl) 732{ 733 struct mei_device *dev; 734 struct mei_me_client *me_cl; 735 736 if (WARN_ON(!cl || !cl->dev)) 737 return -EINVAL; 738 739 dev = cl->dev; 740 741 me_cl = mei_me_cl_by_id(dev, cl->me_client_id); 742 if (!me_cl) { 743 cl_err(dev, cl, "no such me client %d\n", cl->me_client_id); 744 return -ENOENT; 745 } 746 747 if (me_cl->props.single_recv_buf) { 748 if (WARN_ON(me_cl->mei_flow_ctrl_creds <= 0)) 749 return -EINVAL; 750 me_cl->mei_flow_ctrl_creds--; 751 } else { 752 if (WARN_ON(cl->mei_flow_ctrl_creds <= 0)) 753 return -EINVAL; 754 cl->mei_flow_ctrl_creds--; 755 } 756 return 0; 757} 758 759/** 760 * mei_cl_read_start - the start read client message function. 761 * 762 * @cl: host client 763 * @length: number of bytes to read 764 * 765 * Return: 0 on success, <0 on failure. 766 */ 767int mei_cl_read_start(struct mei_cl *cl, size_t length) 768{ 769 struct mei_device *dev; 770 struct mei_cl_cb *cb; 771 struct mei_me_client *me_cl; 772 int rets; 773 774 if (WARN_ON(!cl || !cl->dev)) 775 return -ENODEV; 776 777 dev = cl->dev; 778 779 if (!mei_cl_is_connected(cl)) 780 return -ENODEV; 781 782 if (cl->read_cb) { 783 cl_dbg(dev, cl, "read is pending.\n"); 784 return -EBUSY; 785 } 786 me_cl = mei_me_cl_by_uuid_id(dev, &cl->cl_uuid, cl->me_client_id); 787 if (!me_cl) { 788 cl_err(dev, cl, "no such me client %d\n", cl->me_client_id); 789 return -ENOTTY; 790 } 791 792 rets = pm_runtime_get(dev->dev); 793 if (rets < 0 && rets != -EINPROGRESS) { 794 pm_runtime_put_noidle(dev->dev); 795 cl_err(dev, cl, "rpm: get failed %d\n", rets); 796 return rets; 797 } 798 799 cb = mei_io_cb_init(cl, NULL); 800 if (!cb) { 801 rets = -ENOMEM; 802 goto out; 803 } 804 805 /* always allocate at least client max message */ 806 length = max_t(size_t, length, me_cl->props.max_msg_length); 807 rets = mei_io_cb_alloc_resp_buf(cb, length); 808 if (rets) 809 goto out; 810 811 cb->fop_type = MEI_FOP_READ; 812 if (mei_hbuf_acquire(dev)) { 813 rets = mei_hbm_cl_flow_control_req(dev, cl); 814 if (rets < 0) 815 goto out; 816 817 list_add_tail(&cb->list, &dev->read_list.list); 818 } else { 819 list_add_tail(&cb->list, &dev->ctrl_wr_list.list); 820 } 821 822 cl->read_cb = cb; 823 824out: 825 cl_dbg(dev, cl, "rpm: autosuspend\n"); 826 pm_runtime_mark_last_busy(dev->dev); 827 pm_runtime_put_autosuspend(dev->dev); 828 829 if (rets) 830 mei_io_cb_free(cb); 831 832 return rets; 833} 834 835/** 836 * mei_cl_irq_write - write a message to device 837 * from the interrupt thread context 838 * 839 * @cl: client 840 * @cb: callback block. 841 * @cmpl_list: complete list. 842 * 843 * Return: 0, OK; otherwise error. 844 */ 845int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb, 846 struct mei_cl_cb *cmpl_list) 847{ 848 struct mei_device *dev; 849 struct mei_msg_data *buf; 850 struct mei_msg_hdr mei_hdr; 851 size_t len; 852 u32 msg_slots; 853 int slots; 854 int rets; 855 856 if (WARN_ON(!cl || !cl->dev)) 857 return -ENODEV; 858 859 dev = cl->dev; 860 861 buf = &cb->request_buffer; 862 863 rets = mei_cl_flow_ctrl_creds(cl); 864 if (rets < 0) 865 return rets; 866 867 if (rets == 0) { 868 cl_dbg(dev, cl, "No flow control credentials: not sending.\n"); 869 return 0; 870 } 871 872 slots = mei_hbuf_empty_slots(dev); 873 len = buf->size - cb->buf_idx; 874 msg_slots = mei_data2slots(len); 875 876 mei_hdr.host_addr = cl->host_client_id; 877 mei_hdr.me_addr = cl->me_client_id; 878 mei_hdr.reserved = 0; 879 mei_hdr.internal = cb->internal; 880 881 if (slots >= msg_slots) { 882 mei_hdr.length = len; 883 mei_hdr.msg_complete = 1; 884 /* Split the message only if we can write the whole host buffer */ 885 } else if (slots == dev->hbuf_depth) { 886 msg_slots = slots; 887 len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr); 888 mei_hdr.length = len; 889 mei_hdr.msg_complete = 0; 890 } else { 891 /* wait for next time the host buffer is empty */ 892 return 0; 893 } 894 895 cl_dbg(dev, cl, "buf: size = %d idx = %lu\n", 896 cb->request_buffer.size, cb->buf_idx); 897 898 rets = mei_write_message(dev, &mei_hdr, buf->data + cb->buf_idx); 899 if (rets) { 900 cl->status = rets; 901 list_move_tail(&cb->list, &cmpl_list->list); 902 return rets; 903 } 904 905 cl->status = 0; 906 cl->writing_state = MEI_WRITING; 907 cb->buf_idx += mei_hdr.length; 908 909 if (mei_hdr.msg_complete) { 910 if (mei_cl_flow_ctrl_reduce(cl)) 911 return -EIO; 912 list_move_tail(&cb->list, &dev->write_waiting_list.list); 913 } 914 915 return 0; 916} 917 918/** 919 * mei_cl_write - submit a write cb to mei device 920 * assumes device_lock is locked 921 * 922 * @cl: host client 923 * @cb: write callback with filled data 924 * @blocking: block until completed 925 * 926 * Return: number of bytes sent on success, <0 on failure. 927 */ 928int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking) 929{ 930 struct mei_device *dev; 931 struct mei_msg_data *buf; 932 struct mei_msg_hdr mei_hdr; 933 int rets; 934 935 936 if (WARN_ON(!cl || !cl->dev)) 937 return -ENODEV; 938 939 if (WARN_ON(!cb)) 940 return -EINVAL; 941 942 dev = cl->dev; 943 944 945 buf = &cb->request_buffer; 946 947 cl_dbg(dev, cl, "size=%d\n", buf->size); 948 949 rets = pm_runtime_get(dev->dev); 950 if (rets < 0 && rets != -EINPROGRESS) { 951 pm_runtime_put_noidle(dev->dev); 952 cl_err(dev, cl, "rpm: get failed %d\n", rets); 953 return rets; 954 } 955 956 cb->fop_type = MEI_FOP_WRITE; 957 cb->buf_idx = 0; 958 cl->writing_state = MEI_IDLE; 959 960 mei_hdr.host_addr = cl->host_client_id; 961 mei_hdr.me_addr = cl->me_client_id; 962 mei_hdr.reserved = 0; 963 mei_hdr.msg_complete = 0; 964 mei_hdr.internal = cb->internal; 965 966 rets = mei_cl_flow_ctrl_creds(cl); 967 if (rets < 0) 968 goto err; 969 970 if (rets == 0) { 971 cl_dbg(dev, cl, "No flow control credentials: not sending.\n"); 972 rets = buf->size; 973 goto out; 974 } 975 if (!mei_hbuf_acquire(dev)) { 976 cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n"); 977 rets = buf->size; 978 goto out; 979 } 980 981 /* Check for a maximum length */ 982 if (buf->size > mei_hbuf_max_len(dev)) { 983 mei_hdr.length = mei_hbuf_max_len(dev); 984 mei_hdr.msg_complete = 0; 985 } else { 986 mei_hdr.length = buf->size; 987 mei_hdr.msg_complete = 1; 988 } 989 990 rets = mei_write_message(dev, &mei_hdr, buf->data); 991 if (rets) 992 goto err; 993 994 cl->writing_state = MEI_WRITING; 995 cb->buf_idx = mei_hdr.length; 996 997out: 998 if (mei_hdr.msg_complete) { 999 rets = mei_cl_flow_ctrl_reduce(cl); 1000 if (rets < 0) 1001 goto err; 1002 1003 list_add_tail(&cb->list, &dev->write_waiting_list.list); 1004 } else { 1005 list_add_tail(&cb->list, &dev->write_list.list); 1006 } 1007 1008 1009 if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) { 1010 1011 mutex_unlock(&dev->device_lock); 1012 rets = wait_event_interruptible(cl->tx_wait, 1013 cl->writing_state == MEI_WRITE_COMPLETE); 1014 mutex_lock(&dev->device_lock); 1015 /* wait_event_interruptible returns -ERESTARTSYS */ 1016 if (rets) { 1017 if (signal_pending(current)) 1018 rets = -EINTR; 1019 goto err; 1020 } 1021 } 1022 1023 rets = buf->size; 1024err: 1025 cl_dbg(dev, cl, "rpm: autosuspend\n"); 1026 pm_runtime_mark_last_busy(dev->dev); 1027 pm_runtime_put_autosuspend(dev->dev); 1028 1029 return rets; 1030} 1031 1032 1033/** 1034 * mei_cl_complete - processes completed operation for a client 1035 * 1036 * @cl: private data of the file object. 1037 * @cb: callback block. 1038 */ 1039void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb) 1040{ 1041 if (cb->fop_type == MEI_FOP_WRITE) { 1042 mei_io_cb_free(cb); 1043 cb = NULL; 1044 cl->writing_state = MEI_WRITE_COMPLETE; 1045 if (waitqueue_active(&cl->tx_wait)) 1046 wake_up_interruptible(&cl->tx_wait); 1047 1048 } else if (cb->fop_type == MEI_FOP_READ && 1049 MEI_READING == cl->reading_state) { 1050 cl->reading_state = MEI_READ_COMPLETE; 1051 if (waitqueue_active(&cl->rx_wait)) 1052 wake_up_interruptible(&cl->rx_wait); 1053 else 1054 mei_cl_bus_rx_event(cl); 1055 1056 } 1057} 1058 1059 1060/** 1061 * mei_cl_all_disconnect - disconnect forcefully all connected clients 1062 * 1063 * @dev: mei device 1064 */ 1065 1066void mei_cl_all_disconnect(struct mei_device *dev) 1067{ 1068 struct mei_cl *cl; 1069 1070 list_for_each_entry(cl, &dev->file_list, link) { 1071 cl->state = MEI_FILE_DISCONNECTED; 1072 cl->mei_flow_ctrl_creds = 0; 1073 cl->timer_count = 0; 1074 } 1075} 1076 1077 1078/** 1079 * mei_cl_all_wakeup - wake up all readers and writers they can be interrupted 1080 * 1081 * @dev: mei device 1082 */ 1083void mei_cl_all_wakeup(struct mei_device *dev) 1084{ 1085 struct mei_cl *cl; 1086 1087 list_for_each_entry(cl, &dev->file_list, link) { 1088 if (waitqueue_active(&cl->rx_wait)) { 1089 cl_dbg(dev, cl, "Waking up reading client!\n"); 1090 wake_up_interruptible(&cl->rx_wait); 1091 } 1092 if (waitqueue_active(&cl->tx_wait)) { 1093 cl_dbg(dev, cl, "Waking up writing client!\n"); 1094 wake_up_interruptible(&cl->tx_wait); 1095 } 1096 } 1097} 1098 1099/** 1100 * mei_cl_all_write_clear - clear all pending writes 1101 * 1102 * @dev: mei device 1103 */ 1104void mei_cl_all_write_clear(struct mei_device *dev) 1105{ 1106 mei_io_list_free(&dev->write_list, NULL); 1107 mei_io_list_free(&dev->write_waiting_list, NULL); 1108} 1109 1110 1111