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_waitqueue_head(&cl->ev_wait);
 559         INIT_LIST_HEAD(&cl->rd_completed);
 560         INIT_LIST_HEAD(&cl->rd_pending);
 561         INIT_LIST_HEAD(&cl->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         dev->dev_state = MEI_DEV_ENABLED;
 694         dev->reset_count = 0;
 695         mutex_unlock(&dev->device_lock);
 696
 697         mei_cl_bus_rescan(dev);
 698
 699         pm_runtime_mark_last_busy(dev->dev);
 700         dev_dbg(dev->dev, "rpm: autosuspend\n");
 701         pm_runtime_autosuspend(dev->dev);
 702 }
 703
 704 /**
 705  * mei_hbuf_acquire - try to acquire host buffer
 706  *
 707  * @dev: the device structure
 708  * Return: true if host buffer was acquired
 709  */
 710 bool mei_hbuf_acquire(struct mei_device *dev)
 711 {
 712         if (mei_pg_state(dev) == MEI_PG_ON ||
 713             mei_pg_in_transition(dev)) {
 714                 dev_dbg(dev->dev, "device is in pg\n");
 715                 return false;
 716         }
 717
 718         if (!dev->hbuf_is_ready) {
 719                 dev_dbg(dev->dev, "hbuf is not ready\n");
 720                 return false;
 721         }
 722
 723         dev->hbuf_is_ready = false;
 724
 725         return true;
 726 }
 727
 728 /**
 729  * mei_cl_set_disconnected - set disconnected state and clear
 730  *   associated states and resources
 731  *
 732  * @cl: host client
 733  */
 734 void mei_cl_set_disconnected(struct mei_cl *cl)
 735 {
 736         struct mei_device *dev = cl->dev;
 737
 738         if (cl->state == MEI_FILE_DISCONNECTED ||
 739             cl->state == MEI_FILE_INITIALIZING)
 740                 return;
 741
 742         cl->state = MEI_FILE_DISCONNECTED;
 743         mei_io_list_flush(&dev->ctrl_rd_list, cl);
 744         mei_io_list_flush(&dev->ctrl_wr_list, cl);
 745         cl->mei_flow_ctrl_creds = 0;
 746         cl->timer_count = 0;
 747
 748         if (!cl->me_cl)
 749                 return;
 750
 751         if (!WARN_ON(cl->me_cl->connect_count == 0))
 752                 cl->me_cl->connect_count--;
 753
 754         if (cl->me_cl->connect_count == 0)
 755                 cl->me_cl->mei_flow_ctrl_creds = 0;
 756
 757         mei_me_cl_put(cl->me_cl);
 758         cl->me_cl = NULL;
 759 }
 760
 761 static int mei_cl_set_connecting(struct mei_cl *cl, struct mei_me_client *me_cl)
 762 {
 763         if (!mei_me_cl_get(me_cl))
 764                 return -ENOENT;
 765
 766         /* only one connection is allowed for fixed address clients */
 767         if (me_cl->props.fixed_address) {
 768                 if (me_cl->connect_count) {
 769                         mei_me_cl_put(me_cl);
 770                         return -EBUSY;
 771                 }
 772         }
 773
 774         cl->me_cl = me_cl;
 775         cl->state = MEI_FILE_CONNECTING;
 776         cl->me_cl->connect_count++;
 777
 778         return 0;
 779 }
 780
 781 /*
 782  * mei_cl_send_disconnect - send disconnect request
 783  *
 784  * @cl: host client
 785  * @cb: callback block
 786  *
 787  * Return: 0, OK; otherwise, error.
 788  */
 789 static int mei_cl_send_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb)
 790 {
 791         struct mei_device *dev;
 792         int ret;
 793
 794         dev = cl->dev;
 795
 796         ret = mei_hbm_cl_disconnect_req(dev, cl);
 797         cl->status = ret;
 798         if (ret) {
 799                 cl->state = MEI_FILE_DISCONNECT_REPLY;
 800                 return ret;
 801         }
 802
 803         list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
 804         cl->timer_count = MEI_CONNECT_TIMEOUT;
 805
 806         return 0;
 807 }
 808
 809 /**
 810  * mei_cl_irq_disconnect - processes close related operation from
 811  *      interrupt thread context - send disconnect request
 812  *
 813  * @cl: client
 814  * @cb: callback block.
 815  * @cmpl_list: complete list.
 816  *
 817  * Return: 0, OK; otherwise, error.
 818  */
 819 int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb,
 820                             struct mei_cl_cb *cmpl_list)
 821 {
 822         struct mei_device *dev = cl->dev;
 823         u32 msg_slots;
 824         int slots;
 825         int ret;
 826
 827         msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
 828         slots = mei_hbuf_empty_slots(dev);
 829
 830         if (slots < msg_slots)
 831                 return -EMSGSIZE;
 832
 833         ret = mei_cl_send_disconnect(cl, cb);
 834         if (ret)
 835                 list_move_tail(&cb->list, &cmpl_list->list);
 836
 837         return ret;
 838 }
 839
 840 /**
 841  * __mei_cl_disconnect - disconnect host client from the me one
 842  *     internal function runtime pm has to be already acquired
 843  *
 844  * @cl: host client
 845  *
 846  * Return: 0 on success, <0 on failure.
 847  */
 848 static int __mei_cl_disconnect(struct mei_cl *cl)
 849 {
 850         struct mei_device *dev;
 851         struct mei_cl_cb *cb;
 852         int rets;
 853
 854         dev = cl->dev;
 855
 856         cl->state = MEI_FILE_DISCONNECTING;
 857
 858         cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT, NULL);
 859         rets = cb ? 0 : -ENOMEM;
 860         if (rets)
 861                 goto out;
 862
 863         cl_dbg(dev, cl, "add disconnect cb to control write list\n");
 864         list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
 865
 866         if (mei_hbuf_acquire(dev)) {
 867                 rets = mei_cl_send_disconnect(cl, cb);
 868                 if (rets) {
 869                         cl_err(dev, cl, "failed to disconnect.\n");
 870                         goto out;
 871                 }
 872         }
 873
 874         mutex_unlock(&dev->device_lock);
 875         wait_event_timeout(cl->wait, cl->state == MEI_FILE_DISCONNECT_REPLY,
 876                            mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
 877         mutex_lock(&dev->device_lock);
 878
 879         rets = cl->status;
 880         if (cl->state != MEI_FILE_DISCONNECT_REPLY) {
 881                 cl_dbg(dev, cl, "timeout on disconnect from FW client.\n");
 882                 rets = -ETIME;
 883         }
 884
 885 out:
 886         /* we disconnect also on error */
 887         mei_cl_set_disconnected(cl);
 888         if (!rets)
 889                 cl_dbg(dev, cl, "successfully disconnected from FW client.\n");
 890
 891         mei_io_cb_free(cb);
 892         return rets;
 893 }
 894
 895 /**
 896  * mei_cl_disconnect - disconnect host client from the me one
 897  *
 898  * @cl: host client
 899  *
 900  * Locking: called under "dev->device_lock" lock
 901  *
 902  * Return: 0 on success, <0 on failure.
 903  */
 904 int mei_cl_disconnect(struct mei_cl *cl)
 905 {
 906         struct mei_device *dev;
 907         int rets;
 908
 909         if (WARN_ON(!cl || !cl->dev))
 910                 return -ENODEV;
 911
 912         dev = cl->dev;
 913
 914         cl_dbg(dev, cl, "disconnecting");
 915
 916         if (!mei_cl_is_connected(cl))
 917                 return 0;
 918
 919         if (mei_cl_is_fixed_address(cl)) {
 920                 mei_cl_set_disconnected(cl);
 921                 return 0;
 922         }
 923
 924         rets = pm_runtime_get(dev->dev);
 925         if (rets < 0 && rets != -EINPROGRESS) {
 926                 pm_runtime_put_noidle(dev->dev);
 927                 cl_err(dev, cl, "rpm: get failed %d\n", rets);
 928                 return rets;
 929         }
 930
 931         rets = __mei_cl_disconnect(cl);
 932
 933         cl_dbg(dev, cl, "rpm: autosuspend\n");
 934         pm_runtime_mark_last_busy(dev->dev);
 935         pm_runtime_put_autosuspend(dev->dev);
 936
 937         return rets;
 938 }
 939
 940
 941 /**
 942  * mei_cl_is_other_connecting - checks if other
 943  *    client with the same me client id is connecting
 944  *
 945  * @cl: private data of the file object
 946  *
 947  * Return: true if other client is connected, false - otherwise.
 948  */
 949 static bool mei_cl_is_other_connecting(struct mei_cl *cl)
 950 {
 951         struct mei_device *dev;
 952         struct mei_cl_cb *cb;
 953
 954         dev = cl->dev;
 955
 956         list_for_each_entry(cb, &dev->ctrl_rd_list.list, list) {
 957                 if (cb->fop_type == MEI_FOP_CONNECT &&
 958                     mei_cl_me_id(cl) == mei_cl_me_id(cb->cl))
 959                         return true;
 960         }
 961
 962         return false;
 963 }
 964
 965 /**
 966  * mei_cl_send_connect - send connect request
 967  *
 968  * @cl: host client
 969  * @cb: callback block
 970  *
 971  * Return: 0, OK; otherwise, error.
 972  */
 973 static int mei_cl_send_connect(struct mei_cl *cl, struct mei_cl_cb *cb)
 974 {
 975         struct mei_device *dev;
 976         int ret;
 977
 978         dev = cl->dev;
 979
 980         ret = mei_hbm_cl_connect_req(dev, cl);
 981         cl->status = ret;
 982         if (ret) {
 983                 cl->state = MEI_FILE_DISCONNECT_REPLY;
 984                 return ret;
 985         }
 986
 987         list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
 988         cl->timer_count = MEI_CONNECT_TIMEOUT;
 989         return 0;
 990 }
 991
 992 /**
 993  * mei_cl_irq_connect - send connect request in irq_thread context
 994  *
 995  * @cl: host client
 996  * @cb: callback block
 997  * @cmpl_list: complete list
 998  *
 999  * Return: 0, OK; otherwise, error.
1000  */
1001 int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
1002                               struct mei_cl_cb *cmpl_list)
1003 {
1004         struct mei_device *dev = cl->dev;
1005         u32 msg_slots;
1006         int slots;
1007         int rets;
1008
1009         msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
1010         slots = mei_hbuf_empty_slots(dev);
1011
1012         if (mei_cl_is_other_connecting(cl))
1013                 return 0;
1014
1015         if (slots < msg_slots)
1016                 return -EMSGSIZE;
1017
1018         rets = mei_cl_send_connect(cl, cb);
1019         if (rets)
1020                 list_move_tail(&cb->list, &cmpl_list->list);
1021
1022         return rets;
1023 }
1024
1025 /**
1026  * mei_cl_connect - connect host client to the me one
1027  *
1028  * @cl: host client
1029  * @me_cl: me client
1030  * @file: pointer to file structure
1031  *
1032  * Locking: called under "dev->device_lock" lock
1033  *
1034  * Return: 0 on success, <0 on failure.
1035  */
1036 int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl,
1037                    struct file *file)
1038 {
1039         struct mei_device *dev;
1040         struct mei_cl_cb *cb;
1041         int rets;
1042
1043         if (WARN_ON(!cl || !cl->dev || !me_cl))
1044                 return -ENODEV;
1045
1046         dev = cl->dev;
1047
1048         rets = mei_cl_set_connecting(cl, me_cl);
1049         if (rets)
1050                 return rets;
1051
1052         if (mei_cl_is_fixed_address(cl)) {
1053                 cl->state = MEI_FILE_CONNECTED;
1054                 return 0;
1055         }
1056
1057         rets = pm_runtime_get(dev->dev);
1058         if (rets < 0 && rets != -EINPROGRESS) {
1059                 pm_runtime_put_noidle(dev->dev);
1060                 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1061                 goto nortpm;
1062         }
1063
1064         cb = mei_io_cb_init(cl, MEI_FOP_CONNECT, file);
1065         rets = cb ? 0 : -ENOMEM;
1066         if (rets)
1067                 goto out;
1068
1069         list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
1070
1071         /* run hbuf acquire last so we don't have to undo */
1072         if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) {
1073                 rets = mei_cl_send_connect(cl, cb);
1074                 if (rets)
1075                         goto out;
1076         }
1077
1078         mutex_unlock(&dev->device_lock);
1079         wait_event_timeout(cl->wait,
1080                         (cl->state == MEI_FILE_CONNECTED ||
1081                          cl->state == MEI_FILE_DISCONNECT_REQUIRED ||
1082                          cl->state == MEI_FILE_DISCONNECT_REPLY),
1083                         mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
1084         mutex_lock(&dev->device_lock);
1085
1086         if (!mei_cl_is_connected(cl)) {
1087                 if (cl->state == MEI_FILE_DISCONNECT_REQUIRED) {
1088                         mei_io_list_flush(&dev->ctrl_rd_list, cl);
1089                         mei_io_list_flush(&dev->ctrl_wr_list, cl);
1090                          /* ignore disconnect return valuue;
1091                           * in case of failure reset will be invoked
1092                           */
1093                         __mei_cl_disconnect(cl);
1094                         rets = -EFAULT;
1095                         goto out;
1096                 }
1097
1098                 /* timeout or something went really wrong */
1099                 if (!cl->status)
1100                         cl->status = -EFAULT;
1101         }
1102
1103         rets = cl->status;
1104 out:
1105         cl_dbg(dev, cl, "rpm: autosuspend\n");
1106         pm_runtime_mark_last_busy(dev->dev);
1107         pm_runtime_put_autosuspend(dev->dev);
1108
1109         mei_io_cb_free(cb);
1110
1111 nortpm:
1112         if (!mei_cl_is_connected(cl))
1113                 mei_cl_set_disconnected(cl);
1114
1115         return rets;
1116 }
1117
1118 /**
1119  * mei_cl_alloc_linked - allocate and link host client
1120  *
1121  * @dev: the device structure
1122  * @id: fixed host id or MEI_HOST_CLIENT_ID_ANY (-1) for generic one
1123  *
1124  * Return: cl on success ERR_PTR on failure
1125  */
1126 struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev, int id)
1127 {
1128         struct mei_cl *cl;
1129         int ret;
1130
1131         cl = mei_cl_allocate(dev);
1132         if (!cl) {
1133                 ret = -ENOMEM;
1134                 goto err;
1135         }
1136
1137         ret = mei_cl_link(cl, id);
1138         if (ret)
1139                 goto err;
1140
1141         return cl;
1142 err:
1143         kfree(cl);
1144         return ERR_PTR(ret);
1145 }
1146
1147
1148
1149 /**
1150  * mei_cl_flow_ctrl_creds - checks flow_control credits for cl.
1151  *
1152  * @cl: private data of the file object
1153  *
1154  * Return: 1 if mei_flow_ctrl_creds >0, 0 - otherwise.
1155  */
1156 int mei_cl_flow_ctrl_creds(struct mei_cl *cl)
1157 {
1158         int rets;
1159
1160         if (WARN_ON(!cl || !cl->me_cl))
1161                 return -EINVAL;
1162
1163         if (cl->mei_flow_ctrl_creds > 0)
1164                 return 1;
1165
1166         if (mei_cl_is_fixed_address(cl)) {
1167                 rets = mei_cl_read_start(cl, mei_cl_mtu(cl), NULL);
1168                 if (rets && rets != -EBUSY)
1169                         return rets;
1170                 return 1;
1171         }
1172
1173         if (mei_cl_is_single_recv_buf(cl)) {
1174                 if (cl->me_cl->mei_flow_ctrl_creds > 0)
1175                         return 1;
1176         }
1177         return 0;
1178 }
1179
1180 /**
1181  * mei_cl_flow_ctrl_reduce - reduces flow_control.
1182  *
1183  * @cl: private data of the file object
1184  *
1185  * Return:
1186  *      0 on success
1187  *      -EINVAL when ctrl credits are <= 0
1188  */
1189 int mei_cl_flow_ctrl_reduce(struct mei_cl *cl)
1190 {
1191         if (WARN_ON(!cl || !cl->me_cl))
1192                 return -EINVAL;
1193
1194         if (mei_cl_is_fixed_address(cl))
1195                 return 0;
1196
1197         if (mei_cl_is_single_recv_buf(cl)) {
1198                 if (WARN_ON(cl->me_cl->mei_flow_ctrl_creds <= 0))
1199                         return -EINVAL;
1200                 cl->me_cl->mei_flow_ctrl_creds--;
1201         } else {
1202                 if (WARN_ON(cl->mei_flow_ctrl_creds <= 0))
1203                         return -EINVAL;
1204                 cl->mei_flow_ctrl_creds--;
1205         }
1206         return 0;
1207 }
1208
1209 /**
1210  *  mei_cl_notify_fop2req - convert fop to proper request
1211  *
1212  * @fop: client notification start response command
1213  *
1214  * Return:  MEI_HBM_NOTIFICATION_START/STOP
1215  */
1216 u8 mei_cl_notify_fop2req(enum mei_cb_file_ops fop)
1217 {
1218         if (fop == MEI_FOP_NOTIFY_START)
1219                 return MEI_HBM_NOTIFICATION_START;
1220         else
1221                 return MEI_HBM_NOTIFICATION_STOP;
1222 }
1223
1224 /**
1225  *  mei_cl_notify_req2fop - convert notification request top file operation type
1226  *
1227  * @req: hbm notification request type
1228  *
1229  * Return:  MEI_FOP_NOTIFY_START/STOP
1230  */
1231 enum mei_cb_file_ops mei_cl_notify_req2fop(u8 req)
1232 {
1233         if (req == MEI_HBM_NOTIFICATION_START)
1234                 return MEI_FOP_NOTIFY_START;
1235         else
1236                 return MEI_FOP_NOTIFY_STOP;
1237 }
1238
1239 /**
1240  * mei_cl_irq_notify - send notification request in irq_thread context
1241  *
1242  * @cl: client
1243  * @cb: callback block.
1244  * @cmpl_list: complete list.
1245  *
1246  * Return: 0 on such and error otherwise.
1247  */
1248 int mei_cl_irq_notify(struct mei_cl *cl, struct mei_cl_cb *cb,
1249                       struct mei_cl_cb *cmpl_list)
1250 {
1251         struct mei_device *dev = cl->dev;
1252         u32 msg_slots;
1253         int slots;
1254         int ret;
1255         bool request;
1256
1257         msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
1258         slots = mei_hbuf_empty_slots(dev);
1259
1260         if (slots < msg_slots)
1261                 return -EMSGSIZE;
1262
1263         request = mei_cl_notify_fop2req(cb->fop_type);
1264         ret = mei_hbm_cl_notify_req(dev, cl, request);
1265         if (ret) {
1266                 cl->status = ret;
1267                 list_move_tail(&cb->list, &cmpl_list->list);
1268                 return ret;
1269         }
1270
1271         list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
1272         return 0;
1273 }
1274
1275 /**
1276  * mei_cl_notify_request - send notification stop/start request
1277  *
1278  * @cl: host client
1279  * @file: associate request with file
1280  * @request: 1 for start or 0 for stop
1281  *
1282  * Locking: called under "dev->device_lock" lock
1283  *
1284  * Return: 0 on such and error otherwise.
1285  */
1286 int mei_cl_notify_request(struct mei_cl *cl, struct file *file, u8 request)
1287 {
1288         struct mei_device *dev;
1289         struct mei_cl_cb *cb;
1290         enum mei_cb_file_ops fop_type;
1291         int rets;
1292
1293         if (WARN_ON(!cl || !cl->dev))
1294                 return -ENODEV;
1295
1296         dev = cl->dev;
1297
1298         if (!dev->hbm_f_ev_supported) {
1299                 cl_dbg(dev, cl, "notifications not supported\n");
1300                 return -EOPNOTSUPP;
1301         }
1302
1303         rets = pm_runtime_get(dev->dev);
1304         if (rets < 0 && rets != -EINPROGRESS) {
1305                 pm_runtime_put_noidle(dev->dev);
1306                 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1307                 return rets;
1308         }
1309
1310         fop_type = mei_cl_notify_req2fop(request);
1311         cb = mei_io_cb_init(cl, fop_type, file);
1312         if (!cb) {
1313                 rets = -ENOMEM;
1314                 goto out;
1315         }
1316
1317         if (mei_hbuf_acquire(dev)) {
1318                 if (mei_hbm_cl_notify_req(dev, cl, request)) {
1319                         rets = -ENODEV;
1320                         goto out;
1321                 }
1322                 list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
1323         } else {
1324                 list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
1325         }
1326
1327         mutex_unlock(&dev->device_lock);
1328         wait_event_timeout(cl->wait, cl->notify_en == request,
1329                         mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
1330         mutex_lock(&dev->device_lock);
1331
1332         if (cl->notify_en != request) {
1333                 mei_io_list_flush(&dev->ctrl_rd_list, cl);
1334                 mei_io_list_flush(&dev->ctrl_wr_list, cl);
1335                 if (!cl->status)
1336                         cl->status = -EFAULT;
1337         }
1338
1339         rets = cl->status;
1340
1341 out:
1342         cl_dbg(dev, cl, "rpm: autosuspend\n");
1343         pm_runtime_mark_last_busy(dev->dev);
1344         pm_runtime_put_autosuspend(dev->dev);
1345
1346         mei_io_cb_free(cb);
1347         return rets;
1348 }
1349
1350 /**
1351  * mei_cl_notify - raise notification
1352  *
1353  * @cl: host client
1354  *
1355  * Locking: called under "dev->device_lock" lock
1356  */
1357 void mei_cl_notify(struct mei_cl *cl)
1358 {
1359         struct mei_device *dev;
1360
1361         if (!cl || !cl->dev)
1362                 return;
1363
1364         dev = cl->dev;
1365
1366         if (!cl->notify_en)
1367                 return;
1368
1369         cl_dbg(dev, cl, "notify event");
1370         cl->notify_ev = true;
1371         wake_up_interruptible_all(&cl->ev_wait);
1372
1373         if (cl->ev_async)
1374                 kill_fasync(&cl->ev_async, SIGIO, POLL_PRI);
1375
1376         mei_cl_bus_notify_event(cl);
1377 }
1378
1379 /**
1380  * mei_cl_notify_get - get or wait for notification event
1381  *
1382  * @cl: host client
1383  * @block: this request is blocking
1384  * @notify_ev: true if notification event was received
1385  *
1386  * Locking: called under "dev->device_lock" lock
1387  *
1388  * Return: 0 on such and error otherwise.
1389  */
1390 int mei_cl_notify_get(struct mei_cl *cl, bool block, bool *notify_ev)
1391 {
1392         struct mei_device *dev;
1393         int rets;
1394
1395         *notify_ev = false;
1396
1397         if (WARN_ON(!cl || !cl->dev))
1398                 return -ENODEV;
1399
1400         dev = cl->dev;
1401
1402         if (!mei_cl_is_connected(cl))
1403                 return -ENODEV;
1404
1405         if (cl->notify_ev)
1406                 goto out;
1407
1408         if (!block)
1409                 return -EAGAIN;
1410
1411         mutex_unlock(&dev->device_lock);
1412         rets = wait_event_interruptible(cl->ev_wait, cl->notify_ev);
1413         mutex_lock(&dev->device_lock);
1414
1415         if (rets < 0)
1416                 return rets;
1417
1418 out:
1419         *notify_ev = cl->notify_ev;
1420         cl->notify_ev = false;
1421         return 0;
1422 }
1423
1424 /**
1425  * mei_cl_read_start - the start read client message function.
1426  *
1427  * @cl: host client
1428  * @length: number of bytes to read
1429  * @fp: pointer to file structure
1430  *
1431  * Return: 0 on success, <0 on failure.
1432  */
1433 int mei_cl_read_start(struct mei_cl *cl, size_t length, struct file *fp)
1434 {
1435         struct mei_device *dev;
1436         struct mei_cl_cb *cb;
1437         int rets;
1438
1439         if (WARN_ON(!cl || !cl->dev))
1440                 return -ENODEV;
1441
1442         dev = cl->dev;
1443
1444         if (!mei_cl_is_connected(cl))
1445                 return -ENODEV;
1446
1447         /* HW currently supports only one pending read */
1448         if (!list_empty(&cl->rd_pending))
1449                 return -EBUSY;
1450
1451         if (!mei_me_cl_is_active(cl->me_cl)) {
1452                 cl_err(dev, cl, "no such me client\n");
1453                 return  -ENOTTY;
1454         }
1455
1456         /* always allocate at least client max message */
1457         length = max_t(size_t, length, mei_cl_mtu(cl));
1458         cb = mei_cl_alloc_cb(cl, length, MEI_FOP_READ, fp);
1459         if (!cb)
1460                 return -ENOMEM;
1461
1462         if (mei_cl_is_fixed_address(cl)) {
1463                 list_add_tail(&cb->list, &cl->rd_pending);
1464                 return 0;
1465         }
1466
1467         rets = pm_runtime_get(dev->dev);
1468         if (rets < 0 && rets != -EINPROGRESS) {
1469                 pm_runtime_put_noidle(dev->dev);
1470                 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1471                 goto nortpm;
1472         }
1473
1474         if (mei_hbuf_acquire(dev)) {
1475                 rets = mei_hbm_cl_flow_control_req(dev, cl);
1476                 if (rets < 0)
1477                         goto out;
1478
1479                 list_add_tail(&cb->list, &cl->rd_pending);
1480         } else {
1481                 rets = 0;
1482                 list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
1483         }
1484
1485 out:
1486         cl_dbg(dev, cl, "rpm: autosuspend\n");
1487         pm_runtime_mark_last_busy(dev->dev);
1488         pm_runtime_put_autosuspend(dev->dev);
1489 nortpm:
1490         if (rets)
1491                 mei_io_cb_free(cb);
1492
1493         return rets;
1494 }
1495
1496 /**
1497  * mei_cl_irq_write - write a message to device
1498  *      from the interrupt thread context
1499  *
1500  * @cl: client
1501  * @cb: callback block.
1502  * @cmpl_list: complete list.
1503  *
1504  * Return: 0, OK; otherwise error.
1505  */
1506 int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
1507                      struct mei_cl_cb *cmpl_list)
1508 {
1509         struct mei_device *dev;
1510         struct mei_msg_data *buf;
1511         struct mei_msg_hdr mei_hdr;
1512         size_t len;
1513         u32 msg_slots;
1514         int slots;
1515         int rets;
1516         bool first_chunk;
1517
1518         if (WARN_ON(!cl || !cl->dev))
1519                 return -ENODEV;
1520
1521         dev = cl->dev;
1522
1523         buf = &cb->buf;
1524
1525         first_chunk = cb->buf_idx == 0;
1526
1527         rets = first_chunk ? mei_cl_flow_ctrl_creds(cl) : 1;
1528         if (rets < 0)
1529                 return rets;
1530
1531         if (rets == 0) {
1532                 cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
1533                 return 0;
1534         }
1535
1536         slots = mei_hbuf_empty_slots(dev);
1537         len = buf->size - cb->buf_idx;
1538         msg_slots = mei_data2slots(len);
1539
1540         mei_hdr.host_addr = mei_cl_host_addr(cl);
1541         mei_hdr.me_addr = mei_cl_me_id(cl);
1542         mei_hdr.reserved = 0;
1543         mei_hdr.internal = cb->internal;
1544
1545         if (slots >= msg_slots) {
1546                 mei_hdr.length = len;
1547                 mei_hdr.msg_complete = 1;
1548         /* Split the message only if we can write the whole host buffer */
1549         } else if (slots == dev->hbuf_depth) {
1550                 msg_slots = slots;
1551                 len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
1552                 mei_hdr.length = len;
1553                 mei_hdr.msg_complete = 0;
1554         } else {
1555                 /* wait for next time the host buffer is empty */
1556                 return 0;
1557         }
1558
1559         cl_dbg(dev, cl, "buf: size = %d idx = %lu\n",
1560                         cb->buf.size, cb->buf_idx);
1561
1562         rets = mei_write_message(dev, &mei_hdr, buf->data + cb->buf_idx);
1563         if (rets) {
1564                 cl->status = rets;
1565                 list_move_tail(&cb->list, &cmpl_list->list);
1566                 return rets;
1567         }
1568
1569         cl->status = 0;
1570         cl->writing_state = MEI_WRITING;
1571         cb->buf_idx += mei_hdr.length;
1572         cb->completed = mei_hdr.msg_complete == 1;
1573
1574         if (first_chunk) {
1575                 if (mei_cl_flow_ctrl_reduce(cl))
1576                         return -EIO;
1577         }
1578
1579         if (mei_hdr.msg_complete)
1580                 list_move_tail(&cb->list, &dev->write_waiting_list.list);
1581
1582         return 0;
1583 }
1584
1585 /**
1586  * mei_cl_write - submit a write cb to mei device
1587  *      assumes device_lock is locked
1588  *
1589  * @cl: host client
1590  * @cb: write callback with filled data
1591  * @blocking: block until completed
1592  *
1593  * Return: number of bytes sent on success, <0 on failure.
1594  */
1595 int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
1596 {
1597         struct mei_device *dev;
1598         struct mei_msg_data *buf;
1599         struct mei_msg_hdr mei_hdr;
1600         int size;
1601         int rets;
1602
1603
1604         if (WARN_ON(!cl || !cl->dev))
1605                 return -ENODEV;
1606
1607         if (WARN_ON(!cb))
1608                 return -EINVAL;
1609
1610         dev = cl->dev;
1611
1612         buf = &cb->buf;
1613         size = buf->size;
1614
1615         cl_dbg(dev, cl, "size=%d\n", size);
1616
1617         rets = pm_runtime_get(dev->dev);
1618         if (rets < 0 && rets != -EINPROGRESS) {
1619                 pm_runtime_put_noidle(dev->dev);
1620                 cl_err(dev, cl, "rpm: get failed %d\n", rets);
1621                 return rets;
1622         }
1623
1624         cb->buf_idx = 0;
1625         cl->writing_state = MEI_IDLE;
1626
1627         mei_hdr.host_addr = mei_cl_host_addr(cl);
1628         mei_hdr.me_addr = mei_cl_me_id(cl);
1629         mei_hdr.reserved = 0;
1630         mei_hdr.msg_complete = 0;
1631         mei_hdr.internal = cb->internal;
1632
1633         rets = mei_cl_flow_ctrl_creds(cl);
1634         if (rets < 0)
1635                 goto err;
1636
1637         if (rets == 0) {
1638                 cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
1639                 rets = size;
1640                 goto out;
1641         }
1642         if (!mei_hbuf_acquire(dev)) {
1643                 cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n");
1644                 rets = size;
1645                 goto out;
1646         }
1647
1648         /* Check for a maximum length */
1649         if (size > mei_hbuf_max_len(dev)) {
1650                 mei_hdr.length = mei_hbuf_max_len(dev);
1651                 mei_hdr.msg_complete = 0;
1652         } else {
1653                 mei_hdr.length = size;
1654                 mei_hdr.msg_complete = 1;
1655         }
1656
1657         rets = mei_write_message(dev, &mei_hdr, buf->data);
1658         if (rets)
1659                 goto err;
1660
1661         rets = mei_cl_flow_ctrl_reduce(cl);
1662         if (rets)
1663                 goto err;
1664
1665         cl->writing_state = MEI_WRITING;
1666         cb->buf_idx = mei_hdr.length;
1667         cb->completed = mei_hdr.msg_complete == 1;
1668
1669 out:
1670         if (mei_hdr.msg_complete)
1671                 list_add_tail(&cb->list, &dev->write_waiting_list.list);
1672         else
1673                 list_add_tail(&cb->list, &dev->write_list.list);
1674
1675         cb = NULL;
1676         if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) {
1677
1678                 mutex_unlock(&dev->device_lock);
1679                 rets = wait_event_interruptible(cl->tx_wait,
1680                                 cl->writing_state == MEI_WRITE_COMPLETE);
1681                 mutex_lock(&dev->device_lock);
1682                 /* wait_event_interruptible returns -ERESTARTSYS */
1683                 if (rets) {
1684                         if (signal_pending(current))
1685                                 rets = -EINTR;
1686                         goto err;
1687                 }
1688         }
1689
1690         rets = size;
1691 err:
1692         cl_dbg(dev, cl, "rpm: autosuspend\n");
1693         pm_runtime_mark_last_busy(dev->dev);
1694         pm_runtime_put_autosuspend(dev->dev);
1695
1696         return rets;
1697 }
1698
1699
1700 /**
1701  * mei_cl_complete - processes completed operation for a client
1702  *
1703  * @cl: private data of the file object.
1704  * @cb: callback block.
1705  */
1706 void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
1707 {
1708         struct mei_device *dev = cl->dev;
1709
1710         switch (cb->fop_type) {
1711         case MEI_FOP_WRITE:
1712                 mei_io_cb_free(cb);
1713                 cl->writing_state = MEI_WRITE_COMPLETE;
1714                 if (waitqueue_active(&cl->tx_wait)) {
1715                         wake_up_interruptible(&cl->tx_wait);
1716                 } else {
1717                         pm_runtime_mark_last_busy(dev->dev);
1718                         pm_request_autosuspend(dev->dev);
1719                 }
1720                 break;
1721
1722         case MEI_FOP_READ:
1723                 list_add_tail(&cb->list, &cl->rd_completed);
1724                 if (waitqueue_active(&cl->rx_wait))
1725                         wake_up_interruptible_all(&cl->rx_wait);
1726                 else
1727                         mei_cl_bus_rx_event(cl);
1728                 break;
1729
1730         case MEI_FOP_CONNECT:
1731         case MEI_FOP_DISCONNECT:
1732         case MEI_FOP_NOTIFY_STOP:
1733         case MEI_FOP_NOTIFY_START:
1734                 if (waitqueue_active(&cl->wait))
1735                         wake_up(&cl->wait);
1736
1737                 break;
1738         default:
1739                 BUG_ON(0);
1740         }
1741 }
1742
1743
1744 /**
1745  * mei_cl_all_disconnect - disconnect forcefully all connected clients
1746  *
1747  * @dev: mei device
1748  */
1749 void mei_cl_all_disconnect(struct mei_device *dev)
1750 {
1751         struct mei_cl *cl;
1752
1753         list_for_each_entry(cl, &dev->file_list, link)
1754                 mei_cl_set_disconnected(cl);
1755 }
1756
1757
1758 /**
1759  * mei_cl_all_wakeup  - wake up all readers and writers they can be interrupted
1760  *
1761  * @dev: mei device
1762  */
1763 void mei_cl_all_wakeup(struct mei_device *dev)
1764 {
1765         struct mei_cl *cl;
1766
1767         list_for_each_entry(cl, &dev->file_list, link) {
1768                 if (waitqueue_active(&cl->rx_wait)) {
1769                         cl_dbg(dev, cl, "Waking up reading client!\n");
1770                         wake_up_interruptible(&cl->rx_wait);
1771                 }
1772                 if (waitqueue_active(&cl->tx_wait)) {
1773                         cl_dbg(dev, cl, "Waking up writing client!\n");
1774                         wake_up_interruptible(&cl->tx_wait);
1775                 }
1776
1777                 /* synchronized under device mutex */
1778                 if (waitqueue_active(&cl->ev_wait)) {
1779                         cl_dbg(dev, cl, "Waking up waiting for event clients!\n");
1780                         wake_up_interruptible(&cl->ev_wait);
1781                 }
1782         }
1783 }
1784
1785 /**
1786  * mei_cl_all_write_clear - clear all pending writes
1787  *
1788  * @dev: mei device
1789  */
1790 void mei_cl_all_write_clear(struct mei_device *dev)
1791 {
1792         mei_io_list_free(&dev->write_list, NULL);
1793         mei_io_list_free(&dev->write_waiting_list, NULL);
1794 }
1795
1796