drivers/misc/mei/client.c

   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_init - initialize me client
  31  *
  32  * @me_cl: me client
  33  */
  34 void mei_me_cl_init(struct mei_me_client *me_cl)
  35 {
  36         INIT_LIST_HEAD(&me_cl->list);
  37         kref_init(&me_cl->refcnt);
  38 }
  39
  40 /**
  41  * mei_me_cl_get - increases me client refcount
  42  *
  43  * @me_cl: me client
  44  *
  45  * Locking: called under "dev->device_lock" lock
  46  *
  47  * Return: me client or NULL
  48  */
  49 struct mei_me_client *mei_me_cl_get(struct mei_me_client *me_cl)
  50 {
  51         if (me_cl && kref_get_unless_zero(&me_cl->refcnt))
  52                 return me_cl;
  53
  54         return NULL;
  55 }
  56
  57 /**
  58  * mei_me_cl_release - free me client
  59  *
  60  * Locking: called under "dev->device_lock" lock
  61  *
  62  * @ref: me_client refcount
  63  */
  64 static void mei_me_cl_release(struct kref *ref)
  65 {
  66         struct mei_me_client *me_cl =
  67                 container_of(ref, struct mei_me_client, refcnt);
  68
  69         kfree(me_cl);
  70 }
  71
  72 /**
  73  * mei_me_cl_put - decrease me client refcount and free client if necessary
  74  *
  75  * Locking: called under "dev->device_lock" lock
  76  *
  77  * @me_cl: me client
  78  */
  79 void mei_me_cl_put(struct mei_me_client *me_cl)
  80 {
  81         if (me_cl)
  82                 kref_put(&me_cl->refcnt, mei_me_cl_release);
  83 }
  84
  85 /**
  86  * __mei_me_cl_del  - delete me client from the list and decrease
  87  *     reference counter
  88  *
  89  * @dev: mei device
  90  * @me_cl: me client
  91  *
  92  * Locking: dev->me_clients_rwsem
  93  */
  94 static void __mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl)
  95 {
  96         if (!me_cl)
  97                 return;
  98
  99         list_del_init(&me_cl->list);
 100         mei_me_cl_put(me_cl);
 101 }
 102
 103 /**
 104  * mei_me_cl_del - delete me client from the list and decrease
 105  *     reference counter
 106  *
 107  * @dev: mei device
 108  * @me_cl: me client
 109  */
 110 void mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl)
 111 {
 112         down_write(&dev->me_clients_rwsem);
 113         __mei_me_cl_del(dev, me_cl);
 114         up_write(&dev->me_clients_rwsem);
 115 }
 116
 117 /**
 118  * mei_me_cl_add - add me client to the list
 119  *
 120  * @dev: mei device
 121  * @me_cl: me client
 122  */
 123 void mei_me_cl_add(struct mei_device *dev, struct mei_me_client *me_cl)
 124 {
 125         down_write(&dev->me_clients_rwsem);
 126         list_add(&me_cl->list, &dev->me_clients);
 127         up_write(&dev->me_clients_rwsem);
 128 }
 129
 130 /**
 131  * __mei_me_cl_by_uuid - locate me client by uuid
 132  *      increases ref count
 133  *
 134  * @dev: mei device
 135  * @uuid: me client uuid
 136  *
 137  * Return: me client or NULL if not found
 138  *
 139  * Locking: dev->me_clients_rwsem
 140  */
 141 static struct mei_me_client *__mei_me_cl_by_uuid(struct mei_device *dev,
 142                                         const uuid_le *uuid)
 143 {
 144         struct mei_me_client *me_cl;
 145         const uuid_le *pn;
 146
 147         WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem));
 148
 149         list_for_each_entry(me_cl, &dev->me_clients, list) {
 150                 pn = &me_cl->props.protocol_name;
 151                 if (uuid_le_cmp(*uuid, *pn) == 0)
 152                         return mei_me_cl_get(me_cl);
 153         }
 154
 155         return NULL;
 156 }
 157
 158 /**
 159  * mei_me_cl_by_uuid - locate me client by uuid
 160  *      increases ref count
 161  *
 162  * @dev: mei device
 163  * @uuid: me client uuid
 164  *
 165  * Return: me client or NULL if not found
 166  *
 167  * Locking: dev->me_clients_rwsem
 168  */
 169 struct mei_me_client *mei_me_cl_by_uuid(struct mei_device *dev,
 170                                         const uuid_le *uuid)
 171 {
 172         struct mei_me_client *me_cl;
 173
 174         down_read(&dev->me_clients_rwsem);
 175         me_cl = __mei_me_cl_by_uuid(dev, uuid);
 176         up_read(&dev->me_clients_rwsem);
 177
 178         return me_cl;
 179 }
 180
 181 /**
 182  * mei_me_cl_by_id - locate me client by client id
 183  *      increases ref count
 184  *
 185  * @dev: the device structure
 186  * @client_id: me client id
 187  *
 188  * Return: me client or NULL if not found
 189  *
 190  * Locking: dev->me_clients_rwsem
 191  */
 192 struct mei_me_client *mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
 193 {
 194
 195         struct mei_me_client *__me_cl, *me_cl = NULL;
 196
 197         down_read(&dev->me_clients_rwsem);
 198         list_for_each_entry(__me_cl, &dev->me_clients, list) {
 199                 if (__me_cl->client_id == client_id) {
 200                         me_cl = mei_me_cl_get(__me_cl);
 201                         break;
 202                 }
 203         }
 204         up_read(&dev->me_clients_rwsem);
 205
 206         return me_cl;
 207 }
 208
 209 /**
 210  * __mei_me_cl_by_uuid_id - locate me client by client id and uuid
 211  *      increases ref count
 212  *
 213  * @dev: the device structure
 214  * @uuid: me client uuid
 215  * @client_id: me client id
 216  *
 217  * Return: me client or null if not found
 218  *
 219  * Locking: dev->me_clients_rwsem
 220  */
 221 static struct mei_me_client *__mei_me_cl_by_uuid_id(struct mei_device *dev,
 222                                            const uuid_le *uuid, u8 client_id)
 223 {
 224         struct mei_me_client *me_cl;
 225         const uuid_le *pn;
 226
 227         WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem));
 228
 229         list_for_each_entry(me_cl, &dev->me_clients, list) {
 230                 pn = &me_cl->props.protocol_name;
 231                 if (uuid_le_cmp(*uuid, *pn) == 0 &&
 232                     me_cl->client_id == client_id)
 233                         return mei_me_cl_get(me_cl);
 234         }
 235
 236         return NULL;
 237 }
 238
 239
 240 /**
 241  * mei_me_cl_by_uuid_id - locate me client by client id and uuid
 242  *      increases ref count
 243  *
 244  * @dev: the device structure
 245  * @uuid: me client uuid
 246  * @client_id: me client id
 247  *
 248  * Return: me client or null if not found
 249  */
 250 struct mei_me_client *mei_me_cl_by_uuid_id(struct mei_device *dev,
 251                                            const uuid_le *uuid, u8 client_id)
 252 {
 253         struct mei_me_client *me_cl;
 254
 255         down_read(&dev->me_clients_rwsem);
 256         me_cl = __mei_me_cl_by_uuid_id(dev, uuid, client_id);
 257         up_read(&dev->me_clients_rwsem);
 258
 259         return me_cl;
 260 }
 261
 262 /**
 263  * mei_me_cl_rm_by_uuid - remove all me clients matching uuid
 264  *
 265  * @dev: the device structure
 266  * @uuid: me client uuid
 267  *
 268  * Locking: called under "dev->device_lock" lock
 269  */
 270 void mei_me_cl_rm_by_uuid(struct mei_device *dev, const uuid_le *uuid)
 271 {
 272         struct mei_me_client *me_cl;
 273
 274         dev_dbg(dev->dev, "remove %pUl\n", uuid);
 275
 276         down_write(&dev->me_clients_rwsem);
 277         me_cl = __mei_me_cl_by_uuid(dev, uuid);
 278         __mei_me_cl_del(dev, me_cl);
 279         up_write(&dev->me_clients_rwsem);
 280 }
 281
 282 /**
 283  * mei_me_cl_rm_by_uuid_id - remove all me clients matching client id
 284  *
 285  * @dev: the device structure
 286  * @uuid: me client uuid
 287  * @id: me client id
 288  *
 289  * Locking: called under "dev->device_lock" lock
 290  */
 291 void mei_me_cl_rm_by_uuid_id(struct mei_device *dev, const uuid_le *uuid, u8 id)
 292 {
 293         struct mei_me_client *me_cl;
 294
 295         dev_dbg(dev->dev, "remove %pUl %d\n", uuid, id);
 296
 297         down_write(&dev->me_clients_rwsem);
 298         me_cl = __mei_me_cl_by_uuid_id(dev, uuid, id);
 299         __mei_me_cl_del(dev, me_cl);
 300         up_write(&dev->me_clients_rwsem);
 301 }
 302
 303 /**
 304  * mei_me_cl_rm_all - remove all me clients
 305  *
 306  * @dev: the device structure
 307  *
 308  * Locking: called under "dev->device_lock" lock
 309  */
 310 void mei_me_cl_rm_all(struct mei_device *dev)
 311 {
 312         struct mei_me_client *me_cl, *next;
 313
 314         down_write(&dev->me_clients_rwsem);
 315         list_for_each_entry_safe(me_cl, next, &dev->me_clients, list)
 316                 __mei_me_cl_del(dev, me_cl);
 317         up_write(&dev->me_clients_rwsem);
 318 }
 319
 320 /**
 321  * mei_cl_cmp_id - tells if the clients are the same
 322  *
 323  * @cl1: host client 1
 324  * @cl2: host client 2
 325  *
 326  * Return: true  - if the clients has same host and me ids
 327  *         false - otherwise
 328  */
 329 static inline bool mei_cl_cmp_id(const struct mei_cl *cl1,
 330                                 const struct mei_cl *cl2)
 331 {
 332         return cl1 && cl2 &&
 333                 (cl1->host_client_id == cl2->host_client_id) &&
 334                 (mei_cl_me_id(cl1) == mei_cl_me_id(cl2));
 335 }
 336
 337 /**
 338  * mei_io_cb_free - free mei_cb_private related memory
 339  *
 340  * @cb: mei callback struct
 341  */
 342 void mei_io_cb_free(struct mei_cl_cb *cb)
 343 {
 344         if (cb == NULL)
 345                 return;
 346
 347         list_del(&cb->list);
 348         kfree(cb->buf.data);
 349         kfree(cb);
 350 }
 351
 352 /**
 353  * mei_io_cb_init - allocate and initialize io callback
 354  *
 355  * @cl: mei client
 356  * @type: operation type
 357  * @fp: pointer to file structure
 358  *
 359  * Return: mei_cl_cb pointer or NULL;
 360  */
 361 struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, enum mei_cb_file_ops type,
 362                                  struct file *fp)
 363 {
 364         struct mei_cl_cb *cb;
 365
 366         cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
 367         if (!cb)
 368                 return NULL;
 369
 370         INIT_LIST_HEAD(&cb->list);
 371         cb->file_object = fp;
 372         cb->cl = cl;
 373         cb->buf_idx = 0;
 374         cb->fop_type = type;
 375         return cb;
 376 }
 377
 378 /**
 379  * __mei_io_list_flush - removes and frees cbs belonging to cl.
 380  *
 381  * @list:  an instance of our list structure
 382  * @cl:    host client, can be NULL for flushing the whole list
 383  * @free:  whether to free the cbs
 384  */
 385 static void __mei_io_list_flush(struct mei_cl_cb *list,
 386                                 struct mei_cl *cl, bool free)
 387 {
 388         struct mei_cl_cb *cb, *next;
 389
 390         /* enable removing everything if no cl is specified */
 391         list_for_each_entry_safe(cb, next, &list->list, list) {
 392                 if (!cl || mei_cl_cmp_id(cl, cb->cl)) {
 393                         list_del_init(&cb->list);
 394                         if (free)
 395                                 mei_io_cb_free(cb);
 396                 }
 397         }
 398 }
 399
 400 /**
 401  * mei_io_list_flush - removes list entry belonging to cl.
 402  *
 403  * @list:  An instance of our list structure
 404  * @cl: host client
 405  */
 406 void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl)
 407 {
 408         __mei_io_list_flush(list, cl, false);
 409 }
 410
 411 /**
 412  * mei_io_list_free - removes cb belonging to cl and free them
 413  *
 414  * @list:  An instance of our list structure
 415  * @cl: host client
 416  */
 417 static inline void mei_io_list_free(struct mei_cl_cb *list, struct mei_cl *cl)
 418 {
 419         __mei_io_list_flush(list, cl, true);
 420 }
 421
 422 /**
 423  * mei_io_cb_alloc_buf - allocate callback buffer
 424  *
 425  * @cb: io callback structure
 426  * @length: size of the buffer
 427  *
 428  * Return: 0 on success
 429  *         -EINVAL if cb is NULL
 430  *         -ENOMEM if allocation failed
 431  */
 432 int mei_io_cb_alloc_buf(struct mei_cl_cb *cb, size_t length)
 433 {
 434         if (!cb)
 435                 return -EINVAL;
 436
 437         if (length == 0)
 438                 return 0;
 439
 440         cb->buf.data = kmalloc(length, GFP_KERNEL);
 441         if (!cb->buf.data)
 442                 return -ENOMEM;
 443         cb->buf.size = length;
 444         return 0;
 445 }
 446
 447 /**
 448  * mei_cl_alloc_cb - a convenient wrapper for allocating read cb
 449  *
 450  * @cl: host client
 451  * @length: size of the buffer
 452  * @type: operation type
 453  * @fp: associated file pointer (might be NULL)
 454  *
 455  * Return: cb on success and NULL on failure
 456  */
 457 struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length,
 458                                   enum mei_cb_file_ops type, struct file *fp)
 459 {
 460         struct mei_cl_cb *cb;
 461
 462         cb = mei_io_cb_init(cl, type, fp);
 463         if (!cb)
 464                 return NULL;
 465
 466         if (mei_io_cb_alloc_buf(cb, length)) {
 467                 mei_io_cb_free(cb);
 468                 return NULL;
 469         }
 470
 471         return cb;
 472 }
 473
 474 /**
 475  * mei_cl_read_cb - find this cl's callback in the read list
 476  *     for a specific file
 477  *
 478  * @cl: host client
 479  * @fp: file pointer (matching cb file object), may be NULL
 480  *
 481  * Return: cb on success, NULL if cb is not found
 482  */
 483 struct mei_cl_cb *mei_cl_read_cb(const struct mei_cl *cl, const struct file *fp)
 484 {
 485         struct mei_cl_cb *cb;
 486
 487         list_for_each_entry(cb, &cl->rd_completed, list)
 488                 if (!fp || fp == cb->file_object)
 489                         return cb;
 490
 491         return NULL;
 492 }
 493
 494 /**
 495  * mei_cl_read_cb_flush - free client's read pending and completed cbs
 496  *   for a specific file
 497  *
 498  * @cl: host client
 499  * @fp: file pointer (matching cb file object), may be NULL
 500  */
 501 void mei_cl_read_cb_flush(const struct mei_cl *cl, const struct file *fp)
 502 {
 503         struct mei_cl_cb *cb, *next;
 504
 505         list_for_each_entry_safe(cb, next, &cl->rd_completed, list)
 506                 if (!fp || fp == cb->file_object)
 507                         mei_io_cb_free(cb);
 508
 509
 510         list_for_each_entry_safe(cb, next, &cl->rd_pending, list)
 511                 if (!fp || fp == cb->file_object)
 512                         mei_io_cb_free(cb);
 513 }
 514
 515 /**
 516  * mei_cl_flush_queues - flushes queue lists belonging to cl.
 517  *
 518  * @cl: host client
 519  * @fp: file pointer (matching cb file object), may be NULL
 520  *
 521  * Return: 0 on success, -EINVAL if cl or cl->dev is NULL.
 522  */
 523 int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp)
 524 {
 525         struct mei_device *dev;
 526
 527         if (WARN_ON(!cl || !cl->dev))
 528                 return -EINVAL;
 529
 530         dev = cl->dev;
 531
 532         cl_dbg(dev, cl, "remove list entry belonging to cl\n");
 533         mei_io_list_free(&cl->dev->write_list, cl);
 534         mei_io_list_free(&cl->dev->write_waiting_list, cl);
 535         mei_io_list_flush(&cl->dev->ctrl_wr_list, cl);
 536         mei_io_list_flush(&cl->dev->ctrl_rd_list, cl);
 537         mei_io_list_flush(&cl->dev->amthif_cmd_list, cl);
 538         mei_io_list_flush(&cl->dev->amthif_rd_complete_list, cl);
 539
 540         mei_cl_read_cb_flush(cl, fp);
 541
 542         return 0;
 543 }
 544
 545
 546 /**
 547  * mei_cl_init - initializes cl.
 548  *
 549  * @cl: host client to be initialized
 550  * @dev: mei device
 551  */
 552 void mei_cl_init(struct mei_cl *cl, struct mei_device *dev)
 553 {
 554         memset(cl, 0, sizeof(struct mei_cl));
 555         init_waitqueue_head(&cl->wait);
 556         init_waitqueue_head(&cl->rx_wait);
 557         init_waitqueue_head(&cl->tx_wait);
 558         INIT_LIST_HEAD(&cl->rd_completed);
 559         INIT_LIST_HEAD(&cl->rd_pending);
 560         INIT_LIST_HEAD(&cl->link);
 561         INIT_LIST_HEAD(&cl->device_link);
 562         cl->writing_state = MEI_IDLE;
 563         cl->state = MEI_FILE_INITIALIZING;
 564         cl->dev = dev;
 565 }
 566
 567 /**
 568  * mei_cl_allocate - allocates cl  structure and sets it up.
 569  *
 570  * @dev: mei device
 571  * Return:  The allocated file or NULL on failure
 572  */
 573 struct mei_cl *mei_cl_allocate(struct mei_device *dev)
 574 {
 575         struct mei_cl *cl;
 576
 577         cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
 578         if (!cl)
 579                 return NULL;
 580
 581         mei_cl_init(cl, dev);
 582
 583         return cl;
 584 }
 585
 586 /**
 587  * mei_cl_link - allocate host id in the host map
 588  *
 589  * @cl: host client
 590  * @id: fixed host id or MEI_HOST_CLIENT_ID_ANY (-1) for generic one
 591  *
 592  * Return: 0 on success
 593  *      -EINVAL on incorrect values
 594  *      -EMFILE if open count exceeded.
 595  */
 596 int mei_cl_link(struct mei_cl *cl, int id)
 597 {
 598         struct mei_device *dev;
 599         long open_handle_count;
 600
 601         if (WARN_ON(!cl || !cl->dev))
 602                 return -EINVAL;
 603
 604         dev = cl->dev;
 605
 606         /* If Id is not assigned get one*/
 607         if (id == MEI_HOST_CLIENT_ID_ANY)
 608                 id = find_first_zero_bit(dev->host_clients_map,
 609                                         MEI_CLIENTS_MAX);
 610
 611         if (id >= MEI_CLIENTS_MAX) {
 612                 dev_err(dev->dev, "id exceeded %d", MEI_CLIENTS_MAX);
 613                 return -EMFILE;
 614         }
 615
 616         open_handle_count = dev->open_handle_count + dev->iamthif_open_count;
 617         if (open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) {
 618                 dev_err(dev->dev, "open_handle_count exceeded %d",
 619                         MEI_MAX_OPEN_HANDLE_COUNT);
 620                 return -EMFILE;
 621         }
 622
 623         dev->open_handle_count++;
 624
 625         cl->host_client_id = id;
 626         list_add_tail(&cl->link, &dev->file_list);
 627
 628         set_bit(id, dev->host_clients_map);
 629
 630         cl->state = MEI_FILE_INITIALIZING;
 631
 632         cl_dbg(dev, cl, "link cl\n");
 633         return 0;
 634 }
 635
 636 /**
 637  * mei_cl_unlink - remove host client from the list
 638  *
 639  * @cl: host client
 640  *
 641  * Return: always 0
 642  */
 643 int mei_cl_unlink(struct mei_cl *cl)
 644 {
 645         struct mei_device *dev;
 646
 647         /* don't shout on error exit path */
 648         if (!cl)
 649                 return 0;
 650
 651         /* wd and amthif might not be initialized */
 652         if (!cl->dev)
 653                 return 0;
 654
 655         dev = cl->dev;
 656
 657         cl_dbg(dev, cl, "unlink client");
 658
 659         if (dev->open_handle_count > 0)
 660                 dev->open_handle_count--;
 661
 662         /* never clear the 0 bit */
 663         if (cl->host_client_id)
 664                 clear_bit(cl->host_client_id, dev->host_clients_map);
 665
 666         list_del_init(&cl->link);
 667
 668         cl->state = MEI_FILE_INITIALIZING;
 669
 670         return 0;
 671 }
 672
 673
 674 void mei_host_client_init(struct work_struct *work)
 675 {
 676         struct mei_device *dev =
 677                 container_of(work, struct mei_device, init_work);
 678         struct mei_me_client *me_cl;
 679
 680         mutex_lock(&dev->device_lock);
 681
 682
 683         me_cl = mei_me_cl_by_uuid(dev, &mei_amthif_guid);
 684         if (me_cl)
 685                 mei_amthif_host_init(dev, me_cl);
 686         mei_me_cl_put(me_cl);
 687
 688         me_cl = mei_me_cl_by_uuid(dev, &mei_wd_guid);
 689         if (me_cl)
 690                 mei_wd_host_init(dev, me_cl);
 691         mei_me_cl_put(me_cl);
 692
 693         me_cl = mei_me_cl_by_uuid(dev, &mei_nfc_guid);
 694         if (me_cl)
 695                 mei_nfc_host_init(dev, me_cl);
 696         mei_me_cl_put(me_cl);
 697
 698
 699         dev->dev_state = MEI_DEV_ENABLED;
 700         dev->reset_count = 0;
 701         mutex_unlock(&dev->device_lock);
 702
 703         pm_runtime_mark_last_busy(dev->dev);
 704         dev_dbg(dev->dev, "rpm: autosuspend\n");
 705         pm_runtime_autosuspend(dev->dev);
 706 }
 707
 708 /**
 709  * mei_hbuf_acquire - try to acquire host buffer
 710  *
 711  * @dev: the device structure
 712  * Return: true if host buffer was acquired
 713  */
 714 bool mei_hbuf_acquire(struct mei_device *dev)
 715 {
 716         if (mei_pg_state(dev) == MEI_PG_ON ||
 717             mei_pg_in_transition(dev)) {
 718                 dev_dbg(dev->dev, "device is in pg\n");
 719                 return false;
 720         }
 721
 722         if (!dev->hbuf_is_ready) {
 723                 dev_dbg(dev->dev, "hbuf is not ready\n");
 724                 return false;
 725         }
 726
 727         dev->hbuf_is_ready = false;
 728
 729         return true;
 730 }
 731
 732 /**
 733  * mei_cl_set_disconnected - set disconnected state and clear
 734  *   associated states and resources
 735  *
 736  * @cl: host client
 737  */
 738 void mei_cl_set_disconnected(struct mei_cl *cl)
 739 {
 740         struct mei_device *dev = cl->dev;
 741
 742         if (cl->state == MEI_FILE_DISCONNECTED ||
 743             cl->state == MEI_FILE_INITIALIZING)
 744                 return;
 745
 746         cl->state = MEI_FILE_DISCONNECTED;
 747         mei_io_list_flush(&dev->ctrl_rd_list, cl);
 748         mei_io_list_flush(&dev->ctrl_wr_list, cl);
 749         cl->mei_flow_ctrl_creds = 0;
 750         cl->timer_count = 0;
 751
 752         if (!cl->me_cl)
 753                 return;
 754
 755         if (!WARN_ON(cl->me_cl->connect_count == 0))
 756                 cl->me_cl->connect_count--;
 757
 758         if (cl->me_cl->connect_count == 0)
 759                 cl->me_cl->mei_flow_ctrl_creds = 0;
 760
 761         mei_me_cl_put(cl->me_cl);
 762         cl->me_cl = NULL;
 763 }
 764
 765 static int mei_cl_set_connecting(struct mei_cl *cl, struct mei_me_client *me_cl)
 766 {
 767         if (!mei_me_cl_get(me_cl))
 768                 return -ENOENT;
 769
 770         /* only one connection is allowed for fixed address clients */
 771         if (me_cl->props.fixed_address) {
 772                 if (me_cl->connect_count) {
 773                         mei_me_cl_put(me_cl);
 774                         return -EBUSY;
 775                 }
 776         }
 777
 778         cl->me_cl = me_cl;
 779         cl->state = MEI_FILE_CONNECTING;
 780         cl->me_cl->connect_count++;
 781
 782         return 0;
 783 }
 784
 785 /*
 786  * mei_cl_send_disconnect - send disconnect request
 787  *
 788  * @cl: host client
 789  * @cb: callback block
 790  *
 791  * Return: 0, OK; otherwise, error.
 792  */
 793 static int mei_cl_send_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb)
 794 {
 795         struct mei_device *dev;
 796         int ret;
 797
 798         dev = cl->dev;
 799
 800         ret = mei_hbm_cl_disconnect_req(dev, cl);
 801         cl->status = ret;
 802         if (ret) {
 803                 cl->state = MEI_FILE_DISCONNECT_REPLY;
 804                 return ret;
 805         }
 806
 807         list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
 808         cl->timer_count = MEI_CONNECT_TIMEOUT;
 809
 810         return 0;
 811 }
 812
 813 /**
 814  * mei_cl_irq_disconnect - processes close related operation from
 815  *      interrupt thread context - send disconnect request
 816  *
 817  * @cl: client
 818  * @cb: callback block.
 819  * @cmpl_list: complete list.
 820  *
 821  * Return: 0, OK; otherwise, error.
 822  */
 823 int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb,
 824                             struct mei_cl_cb *cmpl_list)
 825 {
 826         struct mei_device *dev = cl->dev;
 827         u32 msg_slots;
 828         int slots;
 829         int ret;
 830
 831         msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
 832         slots = mei_hbuf_empty_slots(dev);
 833
 834         if (slots < msg_slots)
 835                 return -EMSGSIZE;
 836
 837         ret = mei_cl_send_disconnect(cl, cb);
 838         if (ret)
 839                 list_move_tail(&cb->list, &cmpl_list->list);
 840
 841         return ret;
 842 }
 843
 844
 845
 846 /**
 847  * mei_cl_disconnect - disconnect host client from the me one
 848  *
 849  * @cl: host client
 850  *
 851  * Locking: called under "dev->device_lock" lock
 852  *
 853  * Return: 0 on success, <0 on failure.
 854  */
 855 int mei_cl_disconnect(struct mei_cl *cl)
 856 {
 857         struct mei_device *dev;
 858         struct mei_cl_cb *cb;
 859         int rets;
 860
 861         if (WARN_ON(!cl || !cl->dev))
 862                 return -ENODEV;
 863
 864         dev = cl->dev;
 865
 866         cl_dbg(dev, cl, "disconnecting");
 867
 868         if (!mei_cl_is_connected(cl))
 869                 return 0;
 870
 871         if (mei_cl_is_fixed_address(cl)) {
 872                 mei_cl_set_disconnected(cl);
 873                 return 0;
 874         }
 875
 876         rets = pm_runtime_get(dev->dev);
 877         if (rets < 0 && rets != -EINPROGRESS) {
 878                 pm_runtime_put_noidle(dev->dev);
 879                 cl_err(dev, cl, "rpm: get failed %d\n", rets);
 880                 return rets;
 881         }
 882
 883         cl->state = MEI_FILE_DISCONNECTING;
 884
 885         cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT, NULL);
 886         rets = cb ? 0 : -ENOMEM;
 887         if (rets)
 888                 goto out;
 889
 890         cl_dbg(dev, cl, "add disconnect cb to control write list\n");
 891         list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
 892
 893         if (mei_hbuf_acquire(dev)) {
 894                 rets = mei_cl_send_disconnect(cl, cb);
 895                 if (rets) {
 896                         cl_err(dev, cl, "failed to disconnect.\n");
 897                         goto out;
 898                 }
 899         }
 900
 901         mutex_unlock(&dev->device_lock);
 902         wait_event_timeout(cl->wait, cl->state == MEI_FILE_DISCONNECT_REPLY,
 903                            mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
 904         mutex_lock(&dev->device_lock);
 905
 906         rets = cl->status;
 907         if (cl->state != MEI_FILE_DISCONNECT_REPLY) {
 908                 cl_dbg(dev, cl, "timeout on disconnect from FW client.\n");
 909                 rets = -ETIME;
 910         }
 911
 912 out:
 913         /* we disconnect also on error */
 914         mei_cl_set_disconnected(cl);
 915         if (!rets)
 916                 cl_dbg(dev, cl, "successfully disconnected from FW client.\n");
 917
 918         cl_dbg(dev, cl, "rpm: autosuspend\n");
 919         pm_runtime_mark_last_busy(dev->dev);
 920         pm_runtime_put_autosuspend(dev->dev);
 921
 922         mei_io_cb_free(cb);
 923         return rets;
 924 }
 925
 926
 927 /**
 928  * mei_cl_is_other_connecting - checks if other
 929  *    client with the same me client id is connecting
 930  *
 931  * @cl: private data of the file object
 932  *
 933  * Return: true if other client is connected, false - otherwise.
 934  */
 935 static bool mei_cl_is_other_connecting(struct mei_cl *cl)
 936 {
 937         struct mei_device *dev;
 938         struct mei_cl_cb *cb;
 939
 940         dev = cl->dev;
 941
 942         list_for_each_entry(cb, &dev->ctrl_rd_list.list, list) {
 943                 if (cb->fop_type == MEI_FOP_CONNECT &&
 944                     mei_cl_me_id(cl) == mei_cl_me_id(cb->cl))
 945                         return true;
 946         }
 947
 948         return false;
 949 }
 950
 951 /**
 952  * mei_cl_send_connect - send connect request
 953  *
 954  * @cl: host client
 955  * @cb: callback block
 956  *
 957  * Return: 0, OK; otherwise, error.
 958  */
 959 static int mei_cl_send_connect(struct mei_cl *cl, struct mei_cl_cb *cb)
 960 {
 961         struct mei_device *dev;
 962         int ret;
 963
 964         dev = cl->dev;
 965
 966         ret = mei_hbm_cl_connect_req(dev, cl);
 967         cl->status = ret;
 968         if (ret) {
 969                 cl->state = MEI_FILE_DISCONNECT_REPLY;
 970                 return ret;
 971         }
 972
 973         list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
 974         cl->timer_count = MEI_CONNECT_TIMEOUT;
 975         return 0;
 976 }
 977
 978 /**
 979  * mei_cl_irq_connect - send connect request in irq_thread context
 980  *
 981  * @cl: host client
 982  * @cb: callback block
 983  * @cmpl_list: complete list
 984  *
 985  * Return: 0, OK; otherwise, error.
 986  */
 987 int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
 988                               struct mei_cl_cb *cmpl_list)
 989 {
 990         struct mei_device *dev = cl->dev;
 991         u32 msg_slots;
 992         int slots;
 993         int rets;
 994
 995         msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
 996         slots = mei_hbuf_empty_slots(dev);
 997
 998         if (mei_cl_is_other_connecting(cl))
 999                 return 0;
1000
1001         if (slots < msg_slots)
1002                 return -EMSGSIZE;
1003
1004         rets = mei_cl_send_connect(cl, cb);
1005         if (rets)
1006                 list_move_tail(&cb->list, &cmpl_list->list);
1007
1008         return rets;
1009 }
1010
1011 /**
1012  * mei_cl_connect - connect host client to the me one
1013  *
1014  * @cl: host client
1015  * @me_cl: me client
1016  * @file: pointer to file structure
1017  *
1018  * Locking: called under "dev->device_lock" lock
1019  *
1020  * Return: 0 on success, <0 on failure.
1021  */
1022 int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl,
1023                    struct file *file)
1024 {
1025         struct mei_device *dev;
1026         struct mei_cl_cb *cb;
1027         int rets;
1028
1029         if (WARN_ON(!cl || !cl->dev || !me_cl))
1030                 return -ENODEV;
1031
1032         dev = cl->dev;
1033
1034         rets = mei_cl_set_connecting(cl, me_cl);
1035         if (rets)
1036                 return rets;
1037
1038         if (mei_cl_is_fixed_address(cl)) {
1039                 cl->state = MEI_FILE_CONNECTED;
1040                 return 0;
1041         }
1042
1043         rets = pm_runtime_get(dev->dev);
1044         if (rets < 0 && rets != -EINPROGRESS) {
1045                 pm_runtime_put_noidle(dev->dev);
1046                 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1047                 goto nortpm;
1048         }
1049
1050         cb = mei_io_cb_init(cl, MEI_FOP_CONNECT, file);
1051         rets = cb ? 0 : -ENOMEM;
1052         if (rets)
1053                 goto out;
1054
1055         list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
1056
1057         /* run hbuf acquire last so we don't have to undo */
1058         if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) {
1059                 rets = mei_cl_send_connect(cl, cb);
1060                 if (rets)
1061                         goto out;
1062         }
1063
1064         mutex_unlock(&dev->device_lock);
1065         wait_event_timeout(cl->wait,
1066                         (cl->state == MEI_FILE_CONNECTED ||
1067                          cl->state == MEI_FILE_DISCONNECT_REPLY),
1068                         mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
1069         mutex_lock(&dev->device_lock);
1070
1071         if (!mei_cl_is_connected(cl)) {
1072                 /* timeout or something went really wrong */
1073                 if (!cl->status)
1074                         cl->status = -EFAULT;
1075         }
1076
1077         rets = cl->status;
1078 out:
1079         cl_dbg(dev, cl, "rpm: autosuspend\n");
1080         pm_runtime_mark_last_busy(dev->dev);
1081         pm_runtime_put_autosuspend(dev->dev);
1082
1083         mei_io_cb_free(cb);
1084
1085 nortpm:
1086         if (!mei_cl_is_connected(cl))
1087                 mei_cl_set_disconnected(cl);
1088
1089         return rets;
1090 }
1091
1092 /**
1093  * mei_cl_alloc_linked - allocate and link host client
1094  *
1095  * @dev: the device structure
1096  * @id: fixed host id or MEI_HOST_CLIENT_ID_ANY (-1) for generic one
1097  *
1098  * Return: cl on success ERR_PTR on failure
1099  */
1100 struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev, int id)
1101 {
1102         struct mei_cl *cl;
1103         int ret;
1104
1105         cl = mei_cl_allocate(dev);
1106         if (!cl) {
1107                 ret = -ENOMEM;
1108                 goto err;
1109         }
1110
1111         ret = mei_cl_link(cl, id);
1112         if (ret)
1113                 goto err;
1114
1115         return cl;
1116 err:
1117         kfree(cl);
1118         return ERR_PTR(ret);
1119 }
1120
1121
1122
1123 /**
1124  * mei_cl_flow_ctrl_creds - checks flow_control credits for cl.
1125  *
1126  * @cl: private data of the file object
1127  *
1128  * Return: 1 if mei_flow_ctrl_creds >0, 0 - otherwise.
1129  */
1130 int mei_cl_flow_ctrl_creds(struct mei_cl *cl)
1131 {
1132         int rets;
1133
1134         if (WARN_ON(!cl || !cl->me_cl))
1135                 return -EINVAL;
1136
1137         if (cl->mei_flow_ctrl_creds > 0)
1138                 return 1;
1139
1140         if (mei_cl_is_fixed_address(cl)) {
1141                 rets = mei_cl_read_start(cl, mei_cl_mtu(cl), NULL);
1142                 if (rets && rets != -EBUSY)
1143                         return rets;
1144                 return 1;
1145         }
1146
1147         if (mei_cl_is_single_recv_buf(cl)) {
1148                 if (cl->me_cl->mei_flow_ctrl_creds > 0)
1149                         return 1;
1150         }
1151         return 0;
1152 }
1153
1154 /**
1155  * mei_cl_flow_ctrl_reduce - reduces flow_control.
1156  *
1157  * @cl: private data of the file object
1158  *
1159  * Return:
1160  *      0 on success
1161  *      -EINVAL when ctrl credits are <= 0
1162  */
1163 int mei_cl_flow_ctrl_reduce(struct mei_cl *cl)
1164 {
1165         if (WARN_ON(!cl || !cl->me_cl))
1166                 return -EINVAL;
1167
1168         if (mei_cl_is_fixed_address(cl))
1169                 return 0;
1170
1171         if (mei_cl_is_single_recv_buf(cl)) {
1172                 if (WARN_ON(cl->me_cl->mei_flow_ctrl_creds <= 0))
1173                         return -EINVAL;
1174                 cl->me_cl->mei_flow_ctrl_creds--;
1175         } else {
1176                 if (WARN_ON(cl->mei_flow_ctrl_creds <= 0))
1177                         return -EINVAL;
1178                 cl->mei_flow_ctrl_creds--;
1179         }
1180         return 0;
1181 }
1182
1183 /**
1184  * mei_cl_read_start - the start read client message function.
1185  *
1186  * @cl: host client
1187  * @length: number of bytes to read
1188  * @fp: pointer to file structure
1189  *
1190  * Return: 0 on success, <0 on failure.
1191  */
1192 int mei_cl_read_start(struct mei_cl *cl, size_t length, struct file *fp)
1193 {
1194         struct mei_device *dev;
1195         struct mei_cl_cb *cb;
1196         int rets;
1197
1198         if (WARN_ON(!cl || !cl->dev))
1199                 return -ENODEV;
1200
1201         dev = cl->dev;
1202
1203         if (!mei_cl_is_connected(cl))
1204                 return -ENODEV;
1205
1206         /* HW currently supports only one pending read */
1207         if (!list_empty(&cl->rd_pending))
1208                 return -EBUSY;
1209
1210         if (!mei_me_cl_is_active(cl->me_cl)) {
1211                 cl_err(dev, cl, "no such me client\n");
1212                 return  -ENOTTY;
1213         }
1214
1215         /* always allocate at least client max message */
1216         length = max_t(size_t, length, mei_cl_mtu(cl));
1217         cb = mei_cl_alloc_cb(cl, length, MEI_FOP_READ, fp);
1218         if (!cb)
1219                 return -ENOMEM;
1220
1221         if (mei_cl_is_fixed_address(cl)) {
1222                 list_add_tail(&cb->list, &cl->rd_pending);
1223                 return 0;
1224         }
1225
1226         rets = pm_runtime_get(dev->dev);
1227         if (rets < 0 && rets != -EINPROGRESS) {
1228                 pm_runtime_put_noidle(dev->dev);
1229                 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1230                 goto nortpm;
1231         }
1232
1233         if (mei_hbuf_acquire(dev)) {
1234                 rets = mei_hbm_cl_flow_control_req(dev, cl);
1235                 if (rets < 0)
1236                         goto out;
1237
1238                 list_add_tail(&cb->list, &cl->rd_pending);
1239         } else {
1240                 rets = 0;
1241                 list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
1242         }
1243
1244 out:
1245         cl_dbg(dev, cl, "rpm: autosuspend\n");
1246         pm_runtime_mark_last_busy(dev->dev);
1247         pm_runtime_put_autosuspend(dev->dev);
1248 nortpm:
1249         if (rets)
1250                 mei_io_cb_free(cb);
1251
1252         return rets;
1253 }
1254
1255 /**
1256  * mei_cl_irq_write - write a message to device
1257  *      from the interrupt thread context
1258  *
1259  * @cl: client
1260  * @cb: callback block.
1261  * @cmpl_list: complete list.
1262  *
1263  * Return: 0, OK; otherwise error.
1264  */
1265 int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
1266                      struct mei_cl_cb *cmpl_list)
1267 {
1268         struct mei_device *dev;
1269         struct mei_msg_data *buf;
1270         struct mei_msg_hdr mei_hdr;
1271         size_t len;
1272         u32 msg_slots;
1273         int slots;
1274         int rets;
1275         bool first_chunk;
1276
1277         if (WARN_ON(!cl || !cl->dev))
1278                 return -ENODEV;
1279
1280         dev = cl->dev;
1281
1282         buf = &cb->buf;
1283
1284         first_chunk = cb->buf_idx == 0;
1285
1286         rets = first_chunk ? mei_cl_flow_ctrl_creds(cl) : 1;
1287         if (rets < 0)
1288                 return rets;
1289
1290         if (rets == 0) {
1291                 cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
1292                 return 0;
1293         }
1294
1295         slots = mei_hbuf_empty_slots(dev);
1296         len = buf->size - cb->buf_idx;
1297         msg_slots = mei_data2slots(len);
1298
1299         mei_hdr.host_addr = mei_cl_host_addr(cl);
1300         mei_hdr.me_addr = mei_cl_me_id(cl);
1301         mei_hdr.reserved = 0;
1302         mei_hdr.internal = cb->internal;
1303
1304         if (slots >= msg_slots) {
1305                 mei_hdr.length = len;
1306                 mei_hdr.msg_complete = 1;
1307         /* Split the message only if we can write the whole host buffer */
1308         } else if (slots == dev->hbuf_depth) {
1309                 msg_slots = slots;
1310                 len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
1311                 mei_hdr.length = len;
1312                 mei_hdr.msg_complete = 0;
1313         } else {
1314                 /* wait for next time the host buffer is empty */
1315                 return 0;
1316         }
1317
1318         cl_dbg(dev, cl, "buf: size = %d idx = %lu\n",
1319                         cb->buf.size, cb->buf_idx);
1320
1321         rets = mei_write_message(dev, &mei_hdr, buf->data + cb->buf_idx);
1322         if (rets) {
1323                 cl->status = rets;
1324                 list_move_tail(&cb->list, &cmpl_list->list);
1325                 return rets;
1326         }
1327
1328         cl->status = 0;
1329         cl->writing_state = MEI_WRITING;
1330         cb->buf_idx += mei_hdr.length;
1331         cb->completed = mei_hdr.msg_complete == 1;
1332
1333         if (first_chunk) {
1334                 if (mei_cl_flow_ctrl_reduce(cl))
1335                         return -EIO;
1336         }
1337
1338         if (mei_hdr.msg_complete)
1339                 list_move_tail(&cb->list, &dev->write_waiting_list.list);
1340
1341         return 0;
1342 }
1343
1344 /**
1345  * mei_cl_write - submit a write cb to mei device
1346  *      assumes device_lock is locked
1347  *
1348  * @cl: host client
1349  * @cb: write callback with filled data
1350  * @blocking: block until completed
1351  *
1352  * Return: number of bytes sent on success, <0 on failure.
1353  */
1354 int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
1355 {
1356         struct mei_device *dev;
1357         struct mei_msg_data *buf;
1358         struct mei_msg_hdr mei_hdr;
1359         int rets;
1360
1361
1362         if (WARN_ON(!cl || !cl->dev))
1363                 return -ENODEV;
1364
1365         if (WARN_ON(!cb))
1366                 return -EINVAL;
1367
1368         dev = cl->dev;
1369
1370
1371         buf = &cb->buf;
1372
1373         cl_dbg(dev, cl, "size=%d\n", buf->size);
1374
1375         rets = pm_runtime_get(dev->dev);
1376         if (rets < 0 && rets != -EINPROGRESS) {
1377                 pm_runtime_put_noidle(dev->dev);
1378                 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1379                 return rets;
1380         }
1381
1382         cb->buf_idx = 0;
1383         cl->writing_state = MEI_IDLE;
1384
1385         mei_hdr.host_addr = mei_cl_host_addr(cl);
1386         mei_hdr.me_addr = mei_cl_me_id(cl);
1387         mei_hdr.reserved = 0;
1388         mei_hdr.msg_complete = 0;
1389         mei_hdr.internal = cb->internal;
1390
1391         rets = mei_cl_flow_ctrl_creds(cl);
1392         if (rets < 0)
1393                 goto err;
1394
1395         if (rets == 0) {
1396                 cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
1397                 rets = buf->size;
1398                 goto out;
1399         }
1400         if (!mei_hbuf_acquire(dev)) {
1401                 cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n");
1402                 rets = buf->size;
1403                 goto out;
1404         }
1405
1406         /* Check for a maximum length */
1407         if (buf->size > mei_hbuf_max_len(dev)) {
1408                 mei_hdr.length = mei_hbuf_max_len(dev);
1409                 mei_hdr.msg_complete = 0;
1410         } else {
1411                 mei_hdr.length = buf->size;
1412                 mei_hdr.msg_complete = 1;
1413         }
1414
1415         rets = mei_write_message(dev, &mei_hdr, buf->data);
1416         if (rets)
1417                 goto err;
1418
1419         rets = mei_cl_flow_ctrl_reduce(cl);
1420         if (rets)
1421                 goto err;
1422
1423         cl->writing_state = MEI_WRITING;
1424         cb->buf_idx = mei_hdr.length;
1425         cb->completed = mei_hdr.msg_complete == 1;
1426
1427 out:
1428         if (mei_hdr.msg_complete)
1429                 list_add_tail(&cb->list, &dev->write_waiting_list.list);
1430         else
1431                 list_add_tail(&cb->list, &dev->write_list.list);
1432
1433         if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) {
1434
1435                 mutex_unlock(&dev->device_lock);
1436                 rets = wait_event_interruptible(cl->tx_wait,
1437                                 cl->writing_state == MEI_WRITE_COMPLETE);
1438                 mutex_lock(&dev->device_lock);
1439                 /* wait_event_interruptible returns -ERESTARTSYS */
1440                 if (rets) {
1441                         if (signal_pending(current))
1442                                 rets = -EINTR;
1443                         goto err;
1444                 }
1445         }
1446
1447         rets = buf->size;
1448 err:
1449         cl_dbg(dev, cl, "rpm: autosuspend\n");
1450         pm_runtime_mark_last_busy(dev->dev);
1451         pm_runtime_put_autosuspend(dev->dev);
1452
1453         return rets;
1454 }
1455
1456
1457 /**
1458  * mei_cl_complete - processes completed operation for a client
1459  *
1460  * @cl: private data of the file object.
1461  * @cb: callback block.
1462  */
1463 void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
1464 {
1465         struct mei_device *dev = cl->dev;
1466
1467         switch (cb->fop_type) {
1468         case MEI_FOP_WRITE:
1469                 mei_io_cb_free(cb);
1470                 cl->writing_state = MEI_WRITE_COMPLETE;
1471                 if (waitqueue_active(&cl->tx_wait)) {
1472                         wake_up_interruptible(&cl->tx_wait);
1473                 } else {
1474                         pm_runtime_mark_last_busy(dev->dev);
1475                         pm_request_autosuspend(dev->dev);
1476                 }
1477                 break;
1478
1479         case MEI_FOP_READ:
1480                 list_add_tail(&cb->list, &cl->rd_completed);
1481                 if (waitqueue_active(&cl->rx_wait))
1482                         wake_up_interruptible_all(&cl->rx_wait);
1483                 else
1484                         mei_cl_bus_rx_event(cl);
1485                 break;
1486
1487         case MEI_FOP_CONNECT:
1488         case MEI_FOP_DISCONNECT:
1489                 if (waitqueue_active(&cl->wait))
1490                         wake_up(&cl->wait);
1491
1492                 break;
1493         default:
1494                 BUG_ON(0);
1495         }
1496 }
1497
1498
1499 /**
1500  * mei_cl_all_disconnect - disconnect forcefully all connected clients
1501  *
1502  * @dev: mei device
1503  */
1504 void mei_cl_all_disconnect(struct mei_device *dev)
1505 {
1506         struct mei_cl *cl;
1507
1508         list_for_each_entry(cl, &dev->file_list, link)
1509                 mei_cl_set_disconnected(cl);
1510 }
1511
1512
1513 /**
1514  * mei_cl_all_wakeup  - wake up all readers and writers they can be interrupted
1515  *
1516  * @dev: mei device
1517  */
1518 void mei_cl_all_wakeup(struct mei_device *dev)
1519 {
1520         struct mei_cl *cl;
1521
1522         list_for_each_entry(cl, &dev->file_list, link) {
1523                 if (waitqueue_active(&cl->rx_wait)) {
1524                         cl_dbg(dev, cl, "Waking up reading client!\n");
1525                         wake_up_interruptible(&cl->rx_wait);
1526                 }
1527                 if (waitqueue_active(&cl->tx_wait)) {
1528                         cl_dbg(dev, cl, "Waking up writing client!\n");
1529                         wake_up_interruptible(&cl->tx_wait);
1530                 }
1531         }
1532 }
1533
1534 /**
1535  * mei_cl_all_write_clear - clear all pending writes
1536  *
1537  * @dev: mei device
1538  */
1539 void mei_cl_all_write_clear(struct mei_device *dev)
1540 {
1541         mei_io_list_free(&dev->write_list, NULL);
1542         mei_io_list_free(&dev->write_waiting_list, NULL);
1543 }
1544
1545