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   1 /*
   2  *  linux/drivers/s390/crypto/zcrypt_api.c
   3  *
   4  *  zcrypt 2.1.0
   5  *
   6  *  Copyright (C)  2001, 2006 IBM Corporation
   7  *  Author(s): Robert Burroughs
   8  *             Eric Rossman (edrossma@us.ibm.com)
   9  *             Cornelia Huck <cornelia.huck@de.ibm.com>
  10  *
  11  *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
  12  *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
  13  *                                Ralph Wuerthner <rwuerthn@de.ibm.com>
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2, or (at your option)
  18  * any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/miscdevice.h>
  34 #include <linux/fs.h>
  35 #include <linux/proc_fs.h>
  36 #include <linux/compat.h>
  37 #include <linux/smp_lock.h>
  38 #include <asm/atomic.h>
  39 #include <asm/uaccess.h>
  40 #include <linux/hw_random.h>
  41
  42 #include "zcrypt_api.h"
  43
  44 /*
  45  * Module description.
  46  */
  47 MODULE_AUTHOR("IBM Corporation");
  48 MODULE_DESCRIPTION("Cryptographic Coprocessor interface, "
  49                    "Copyright 2001, 2006 IBM Corporation");
  50 MODULE_LICENSE("GPL");
  51
  52 static DEFINE_SPINLOCK(zcrypt_device_lock);
  53 static LIST_HEAD(zcrypt_device_list);
  54 static int zcrypt_device_count = 0;
  55 static atomic_t zcrypt_open_count = ATOMIC_INIT(0);
  56
  57 static int zcrypt_rng_device_add(void);
  58 static void zcrypt_rng_device_remove(void);
  59
  60 /*
  61  * Device attributes common for all crypto devices.
  62  */
  63 static ssize_t zcrypt_type_show(struct device *dev,
  64                                 struct device_attribute *attr, char *buf)
  65 {
  66         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
  67         return snprintf(buf, PAGE_SIZE, "%s\n", zdev->type_string);
  68 }
  69
  70 static DEVICE_ATTR(type, 0444, zcrypt_type_show, NULL);
  71
  72 static ssize_t zcrypt_online_show(struct device *dev,
  73                                   struct device_attribute *attr, char *buf)
  74 {
  75         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
  76         return snprintf(buf, PAGE_SIZE, "%d\n", zdev->online);
  77 }
  78
  79 static ssize_t zcrypt_online_store(struct device *dev,
  80                                    struct device_attribute *attr,
  81                                    const char *buf, size_t count)
  82 {
  83         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
  84         int online;
  85
  86         if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
  87                 return -EINVAL;
  88         zdev->online = online;
  89         if (!online)
  90                 ap_flush_queue(zdev->ap_dev);
  91         return count;
  92 }
  93
  94 static DEVICE_ATTR(online, 0644, zcrypt_online_show, zcrypt_online_store);
  95
  96 static struct attribute * zcrypt_device_attrs[] = {
  97         &dev_attr_type.attr,
  98         &dev_attr_online.attr,
  99         NULL,
 100 };
 101
 102 static struct attribute_group zcrypt_device_attr_group = {
 103         .attrs = zcrypt_device_attrs,
 104 };
 105
 106 /**
 107  * __zcrypt_increase_preference(): Increase preference of a crypto device.
 108  * @zdev: Pointer the crypto device
 109  *
 110  * Move the device towards the head of the device list.
 111  * Need to be called while holding the zcrypt device list lock.
 112  * Note: cards with speed_rating of 0 are kept at the end of the list.
 113  */
 114 static void __zcrypt_increase_preference(struct zcrypt_device *zdev)
 115 {
 116         struct zcrypt_device *tmp;
 117         struct list_head *l;
 118
 119         if (zdev->speed_rating == 0)
 120                 return;
 121         for (l = zdev->list.prev; l != &zcrypt_device_list; l = l->prev) {
 122                 tmp = list_entry(l, struct zcrypt_device, list);
 123                 if ((tmp->request_count + 1) * tmp->speed_rating <=
 124                     (zdev->request_count + 1) * zdev->speed_rating &&
 125                     tmp->speed_rating != 0)
 126                         break;
 127         }
 128         if (l == zdev->list.prev)
 129                 return;
 130         /* Move zdev behind l */
 131         list_move(&zdev->list, l);
 132 }
 133
 134 /**
 135  * __zcrypt_decrease_preference(): Decrease preference of a crypto device.
 136  * @zdev: Pointer to a crypto device.
 137  *
 138  * Move the device towards the tail of the device list.
 139  * Need to be called while holding the zcrypt device list lock.
 140  * Note: cards with speed_rating of 0 are kept at the end of the list.
 141  */
 142 static void __zcrypt_decrease_preference(struct zcrypt_device *zdev)
 143 {
 144         struct zcrypt_device *tmp;
 145         struct list_head *l;
 146
 147         if (zdev->speed_rating == 0)
 148                 return;
 149         for (l = zdev->list.next; l != &zcrypt_device_list; l = l->next) {
 150                 tmp = list_entry(l, struct zcrypt_device, list);
 151                 if ((tmp->request_count + 1) * tmp->speed_rating >
 152                     (zdev->request_count + 1) * zdev->speed_rating ||
 153                     tmp->speed_rating == 0)
 154                         break;
 155         }
 156         if (l == zdev->list.next)
 157                 return;
 158         /* Move zdev before l */
 159         list_move_tail(&zdev->list, l);
 160 }
 161
 162 static void zcrypt_device_release(struct kref *kref)
 163 {
 164         struct zcrypt_device *zdev =
 165                 container_of(kref, struct zcrypt_device, refcount);
 166         zcrypt_device_free(zdev);
 167 }
 168
 169 void zcrypt_device_get(struct zcrypt_device *zdev)
 170 {
 171         kref_get(&zdev->refcount);
 172 }
 173 EXPORT_SYMBOL(zcrypt_device_get);
 174
 175 int zcrypt_device_put(struct zcrypt_device *zdev)
 176 {
 177         return kref_put(&zdev->refcount, zcrypt_device_release);
 178 }
 179 EXPORT_SYMBOL(zcrypt_device_put);
 180
 181 struct zcrypt_device *zcrypt_device_alloc(size_t max_response_size)
 182 {
 183         struct zcrypt_device *zdev;
 184
 185         zdev = kzalloc(sizeof(struct zcrypt_device), GFP_KERNEL);
 186         if (!zdev)
 187                 return NULL;
 188         zdev->reply.message = kmalloc(max_response_size, GFP_KERNEL);
 189         if (!zdev->reply.message)
 190                 goto out_free;
 191         zdev->reply.length = max_response_size;
 192         spin_lock_init(&zdev->lock);
 193         INIT_LIST_HEAD(&zdev->list);
 194         return zdev;
 195
 196 out_free:
 197         kfree(zdev);
 198         return NULL;
 199 }
 200 EXPORT_SYMBOL(zcrypt_device_alloc);
 201
 202 void zcrypt_device_free(struct zcrypt_device *zdev)
 203 {
 204         kfree(zdev->reply.message);
 205         kfree(zdev);
 206 }
 207 EXPORT_SYMBOL(zcrypt_device_free);
 208
 209 /**
 210  * zcrypt_device_register() - Register a crypto device.
 211  * @zdev: Pointer to a crypto device
 212  *
 213  * Register a crypto device. Returns 0 if successful.
 214  */
 215 int zcrypt_device_register(struct zcrypt_device *zdev)
 216 {
 217         int rc;
 218
 219         rc = sysfs_create_group(&zdev->ap_dev->device.kobj,
 220                                 &zcrypt_device_attr_group);
 221         if (rc)
 222                 goto out;
 223         get_device(&zdev->ap_dev->device);
 224         kref_init(&zdev->refcount);
 225         spin_lock_bh(&zcrypt_device_lock);
 226         zdev->online = 1;       /* New devices are online by default. */
 227         list_add_tail(&zdev->list, &zcrypt_device_list);
 228         __zcrypt_increase_preference(zdev);
 229         zcrypt_device_count++;
 230         spin_unlock_bh(&zcrypt_device_lock);
 231         if (zdev->ops->rng) {
 232                 rc = zcrypt_rng_device_add();
 233                 if (rc)
 234                         goto out_unregister;
 235         }
 236         return 0;
 237
 238 out_unregister:
 239         spin_lock_bh(&zcrypt_device_lock);
 240         zcrypt_device_count--;
 241         list_del_init(&zdev->list);
 242         spin_unlock_bh(&zcrypt_device_lock);
 243         sysfs_remove_group(&zdev->ap_dev->device.kobj,
 244                            &zcrypt_device_attr_group);
 245         put_device(&zdev->ap_dev->device);
 246         zcrypt_device_put(zdev);
 247 out:
 248         return rc;
 249 }
 250 EXPORT_SYMBOL(zcrypt_device_register);
 251
 252 /**
 253  * zcrypt_device_unregister(): Unregister a crypto device.
 254  * @zdev: Pointer to crypto device
 255  *
 256  * Unregister a crypto device.
 257  */
 258 void zcrypt_device_unregister(struct zcrypt_device *zdev)
 259 {
 260         if (zdev->ops->rng)
 261                 zcrypt_rng_device_remove();
 262         spin_lock_bh(&zcrypt_device_lock);
 263         zcrypt_device_count--;
 264         list_del_init(&zdev->list);
 265         spin_unlock_bh(&zcrypt_device_lock);
 266         sysfs_remove_group(&zdev->ap_dev->device.kobj,
 267                            &zcrypt_device_attr_group);
 268         put_device(&zdev->ap_dev->device);
 269         zcrypt_device_put(zdev);
 270 }
 271 EXPORT_SYMBOL(zcrypt_device_unregister);
 272
 273 /**
 274  * zcrypt_read (): Not supported beyond zcrypt 1.3.1.
 275  *
 276  * This function is not supported beyond zcrypt 1.3.1.
 277  */
 278 static ssize_t zcrypt_read(struct file *filp, char __user *buf,
 279                            size_t count, loff_t *f_pos)
 280 {
 281         return -EPERM;
 282 }
 283
 284 /**
 285  * zcrypt_write(): Not allowed.
 286  *
 287  * Write is is not allowed
 288  */
 289 static ssize_t zcrypt_write(struct file *filp, const char __user *buf,
 290                             size_t count, loff_t *f_pos)
 291 {
 292         return -EPERM;
 293 }
 294
 295 /**
 296  * zcrypt_open(): Count number of users.
 297  *
 298  * Device open function to count number of users.
 299  */
 300 static int zcrypt_open(struct inode *inode, struct file *filp)
 301 {
 302         atomic_inc(&zcrypt_open_count);
 303         return 0;
 304 }
 305
 306 /**
 307  * zcrypt_release(): Count number of users.
 308  *
 309  * Device close function to count number of users.
 310  */
 311 static int zcrypt_release(struct inode *inode, struct file *filp)
 312 {
 313         atomic_dec(&zcrypt_open_count);
 314         return 0;
 315 }
 316
 317 /*
 318  * zcrypt ioctls.
 319  */
 320 static long zcrypt_rsa_modexpo(struct ica_rsa_modexpo *mex)
 321 {
 322         struct zcrypt_device *zdev;
 323         int rc;
 324
 325         if (mex->outputdatalength < mex->inputdatalength)
 326                 return -EINVAL;
 327         /*
 328          * As long as outputdatalength is big enough, we can set the
 329          * outputdatalength equal to the inputdatalength, since that is the
 330          * number of bytes we will copy in any case
 331          */
 332         mex->outputdatalength = mex->inputdatalength;
 333
 334         spin_lock_bh(&zcrypt_device_lock);
 335         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 336                 if (!zdev->online ||
 337                     !zdev->ops->rsa_modexpo ||
 338                     zdev->min_mod_size > mex->inputdatalength ||
 339                     zdev->max_mod_size < mex->inputdatalength)
 340                         continue;
 341                 zcrypt_device_get(zdev);
 342                 get_device(&zdev->ap_dev->device);
 343                 zdev->request_count++;
 344                 __zcrypt_decrease_preference(zdev);
 345                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 346                         spin_unlock_bh(&zcrypt_device_lock);
 347                         rc = zdev->ops->rsa_modexpo(zdev, mex);
 348                         spin_lock_bh(&zcrypt_device_lock);
 349                         module_put(zdev->ap_dev->drv->driver.owner);
 350                 }
 351                 else
 352                         rc = -EAGAIN;
 353                 zdev->request_count--;
 354                 __zcrypt_increase_preference(zdev);
 355                 put_device(&zdev->ap_dev->device);
 356                 zcrypt_device_put(zdev);
 357                 spin_unlock_bh(&zcrypt_device_lock);
 358                 return rc;
 359         }
 360         spin_unlock_bh(&zcrypt_device_lock);
 361         return -ENODEV;
 362 }
 363
 364 static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt)
 365 {
 366         struct zcrypt_device *zdev;
 367         unsigned long long z1, z2, z3;
 368         int rc, copied;
 369
 370         if (crt->outputdatalength < crt->inputdatalength ||
 371             (crt->inputdatalength & 1))
 372                 return -EINVAL;
 373         /*
 374          * As long as outputdatalength is big enough, we can set the
 375          * outputdatalength equal to the inputdatalength, since that is the
 376          * number of bytes we will copy in any case
 377          */
 378         crt->outputdatalength = crt->inputdatalength;
 379
 380         copied = 0;
 381  restart:
 382         spin_lock_bh(&zcrypt_device_lock);
 383         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 384                 if (!zdev->online ||
 385                     !zdev->ops->rsa_modexpo_crt ||
 386                     zdev->min_mod_size > crt->inputdatalength ||
 387                     zdev->max_mod_size < crt->inputdatalength)
 388                         continue;
 389                 if (zdev->short_crt && crt->inputdatalength > 240) {
 390                         /*
 391                          * Check inputdata for leading zeros for cards
 392                          * that can't handle np_prime, bp_key, or
 393                          * u_mult_inv > 128 bytes.
 394                          */
 395                         if (copied == 0) {
 396                                 unsigned int len;
 397                                 spin_unlock_bh(&zcrypt_device_lock);
 398                                 /* len is max 256 / 2 - 120 = 8 */
 399                                 len = crt->inputdatalength / 2 - 120;
 400                                 if (len > sizeof(z1))
 401                                         return -EFAULT;
 402                                 z1 = z2 = z3 = 0;
 403                                 if (copy_from_user(&z1, crt->np_prime, len) ||
 404                                     copy_from_user(&z2, crt->bp_key, len) ||
 405                                     copy_from_user(&z3, crt->u_mult_inv, len))
 406                                         return -EFAULT;
 407                                 copied = 1;
 408                                 /*
 409                                  * We have to restart device lookup -
 410                                  * the device list may have changed by now.
 411                                  */
 412                                 goto restart;
 413                         }
 414                         if (z1 != 0ULL || z2 != 0ULL || z3 != 0ULL)
 415                                 /* The device can't handle this request. */
 416                                 continue;
 417                 }
 418                 zcrypt_device_get(zdev);
 419                 get_device(&zdev->ap_dev->device);
 420                 zdev->request_count++;
 421                 __zcrypt_decrease_preference(zdev);
 422                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 423                         spin_unlock_bh(&zcrypt_device_lock);
 424                         rc = zdev->ops->rsa_modexpo_crt(zdev, crt);
 425                         spin_lock_bh(&zcrypt_device_lock);
 426                         module_put(zdev->ap_dev->drv->driver.owner);
 427                 }
 428                 else
 429                         rc = -EAGAIN;
 430                 zdev->request_count--;
 431                 __zcrypt_increase_preference(zdev);
 432                 put_device(&zdev->ap_dev->device);
 433                 zcrypt_device_put(zdev);
 434                 spin_unlock_bh(&zcrypt_device_lock);
 435                 return rc;
 436         }
 437         spin_unlock_bh(&zcrypt_device_lock);
 438         return -ENODEV;
 439 }
 440
 441 static long zcrypt_send_cprb(struct ica_xcRB *xcRB)
 442 {
 443         struct zcrypt_device *zdev;
 444         int rc;
 445
 446         spin_lock_bh(&zcrypt_device_lock);
 447         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 448                 if (!zdev->online || !zdev->ops->send_cprb ||
 449                     (xcRB->user_defined != AUTOSELECT &&
 450                         AP_QID_DEVICE(zdev->ap_dev->qid) != xcRB->user_defined)
 451                     )
 452                         continue;
 453                 zcrypt_device_get(zdev);
 454                 get_device(&zdev->ap_dev->device);
 455                 zdev->request_count++;
 456                 __zcrypt_decrease_preference(zdev);
 457                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 458                         spin_unlock_bh(&zcrypt_device_lock);
 459                         rc = zdev->ops->send_cprb(zdev, xcRB);
 460                         spin_lock_bh(&zcrypt_device_lock);
 461                         module_put(zdev->ap_dev->drv->driver.owner);
 462                 }
 463                 else
 464                         rc = -EAGAIN;
 465                 zdev->request_count--;
 466                 __zcrypt_increase_preference(zdev);
 467                 put_device(&zdev->ap_dev->device);
 468                 zcrypt_device_put(zdev);
 469                 spin_unlock_bh(&zcrypt_device_lock);
 470                 return rc;
 471         }
 472         spin_unlock_bh(&zcrypt_device_lock);
 473         return -ENODEV;
 474 }
 475
 476 static long zcrypt_rng(char *buffer)
 477 {
 478         struct zcrypt_device *zdev;
 479         int rc;
 480
 481         spin_lock_bh(&zcrypt_device_lock);
 482         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 483                 if (!zdev->online || !zdev->ops->rng)
 484                         continue;
 485                 zcrypt_device_get(zdev);
 486                 get_device(&zdev->ap_dev->device);
 487                 zdev->request_count++;
 488                 __zcrypt_decrease_preference(zdev);
 489                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 490                         spin_unlock_bh(&zcrypt_device_lock);
 491                         rc = zdev->ops->rng(zdev, buffer);
 492                         spin_lock_bh(&zcrypt_device_lock);
 493                         module_put(zdev->ap_dev->drv->driver.owner);
 494                 } else
 495                         rc = -EAGAIN;
 496                 zdev->request_count--;
 497                 __zcrypt_increase_preference(zdev);
 498                 put_device(&zdev->ap_dev->device);
 499                 zcrypt_device_put(zdev);
 500                 spin_unlock_bh(&zcrypt_device_lock);
 501                 return rc;
 502         }
 503         spin_unlock_bh(&zcrypt_device_lock);
 504         return -ENODEV;
 505 }
 506
 507 static void zcrypt_status_mask(char status[AP_DEVICES])
 508 {
 509         struct zcrypt_device *zdev;
 510
 511         memset(status, 0, sizeof(char) * AP_DEVICES);
 512         spin_lock_bh(&zcrypt_device_lock);
 513         list_for_each_entry(zdev, &zcrypt_device_list, list)
 514                 status[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 515                         zdev->online ? zdev->user_space_type : 0x0d;
 516         spin_unlock_bh(&zcrypt_device_lock);
 517 }
 518
 519 static void zcrypt_qdepth_mask(char qdepth[AP_DEVICES])
 520 {
 521         struct zcrypt_device *zdev;
 522
 523         memset(qdepth, 0, sizeof(char)  * AP_DEVICES);
 524         spin_lock_bh(&zcrypt_device_lock);
 525         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 526                 spin_lock(&zdev->ap_dev->lock);
 527                 qdepth[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 528                         zdev->ap_dev->pendingq_count +
 529                         zdev->ap_dev->requestq_count;
 530                 spin_unlock(&zdev->ap_dev->lock);
 531         }
 532         spin_unlock_bh(&zcrypt_device_lock);
 533 }
 534
 535 static void zcrypt_perdev_reqcnt(int reqcnt[AP_DEVICES])
 536 {
 537         struct zcrypt_device *zdev;
 538
 539         memset(reqcnt, 0, sizeof(int) * AP_DEVICES);
 540         spin_lock_bh(&zcrypt_device_lock);
 541         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 542                 spin_lock(&zdev->ap_dev->lock);
 543                 reqcnt[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 544                         zdev->ap_dev->total_request_count;
 545                 spin_unlock(&zdev->ap_dev->lock);
 546         }
 547         spin_unlock_bh(&zcrypt_device_lock);
 548 }
 549
 550 static int zcrypt_pendingq_count(void)
 551 {
 552         struct zcrypt_device *zdev;
 553         int pendingq_count = 0;
 554
 555         spin_lock_bh(&zcrypt_device_lock);
 556         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 557                 spin_lock(&zdev->ap_dev->lock);
 558                 pendingq_count += zdev->ap_dev->pendingq_count;
 559                 spin_unlock(&zdev->ap_dev->lock);
 560         }
 561         spin_unlock_bh(&zcrypt_device_lock);
 562         return pendingq_count;
 563 }
 564
 565 static int zcrypt_requestq_count(void)
 566 {
 567         struct zcrypt_device *zdev;
 568         int requestq_count = 0;
 569
 570         spin_lock_bh(&zcrypt_device_lock);
 571         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 572                 spin_lock(&zdev->ap_dev->lock);
 573                 requestq_count += zdev->ap_dev->requestq_count;
 574                 spin_unlock(&zdev->ap_dev->lock);
 575         }
 576         spin_unlock_bh(&zcrypt_device_lock);
 577         return requestq_count;
 578 }
 579
 580 static int zcrypt_count_type(int type)
 581 {
 582         struct zcrypt_device *zdev;
 583         int device_count = 0;
 584
 585         spin_lock_bh(&zcrypt_device_lock);
 586         list_for_each_entry(zdev, &zcrypt_device_list, list)
 587                 if (zdev->user_space_type == type)
 588                         device_count++;
 589         spin_unlock_bh(&zcrypt_device_lock);
 590         return device_count;
 591 }
 592
 593 /**
 594  * zcrypt_ica_status(): Old, depracted combi status call.
 595  *
 596  * Old, deprecated combi status call.
 597  */
 598 static long zcrypt_ica_status(struct file *filp, unsigned long arg)
 599 {
 600         struct ica_z90_status *pstat;
 601         int ret;
 602
 603         pstat = kzalloc(sizeof(*pstat), GFP_KERNEL);
 604         if (!pstat)
 605                 return -ENOMEM;
 606         pstat->totalcount = zcrypt_device_count;
 607         pstat->leedslitecount = zcrypt_count_type(ZCRYPT_PCICA);
 608         pstat->leeds2count = zcrypt_count_type(ZCRYPT_PCICC);
 609         pstat->requestqWaitCount = zcrypt_requestq_count();
 610         pstat->pendingqWaitCount = zcrypt_pendingq_count();
 611         pstat->totalOpenCount = atomic_read(&zcrypt_open_count);
 612         pstat->cryptoDomain = ap_domain_index;
 613         zcrypt_status_mask(pstat->status);
 614         zcrypt_qdepth_mask(pstat->qdepth);
 615         ret = 0;
 616         if (copy_to_user((void __user *) arg, pstat, sizeof(*pstat)))
 617                 ret = -EFAULT;
 618         kfree(pstat);
 619         return ret;
 620 }
 621
 622 static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
 623                                   unsigned long arg)
 624 {
 625         int rc;
 626
 627         switch (cmd) {
 628         case ICARSAMODEXPO: {
 629                 struct ica_rsa_modexpo __user *umex = (void __user *) arg;
 630                 struct ica_rsa_modexpo mex;
 631                 if (copy_from_user(&mex, umex, sizeof(mex)))
 632                         return -EFAULT;
 633                 do {
 634                         rc = zcrypt_rsa_modexpo(&mex);
 635                 } while (rc == -EAGAIN);
 636                 if (rc)
 637                         return rc;
 638                 return put_user(mex.outputdatalength, &umex->outputdatalength);
 639         }
 640         case ICARSACRT: {
 641                 struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg;
 642                 struct ica_rsa_modexpo_crt crt;
 643                 if (copy_from_user(&crt, ucrt, sizeof(crt)))
 644                         return -EFAULT;
 645                 do {
 646                         rc = zcrypt_rsa_crt(&crt);
 647                 } while (rc == -EAGAIN);
 648                 if (rc)
 649                         return rc;
 650                 return put_user(crt.outputdatalength, &ucrt->outputdatalength);
 651         }
 652         case ZSECSENDCPRB: {
 653                 struct ica_xcRB __user *uxcRB = (void __user *) arg;
 654                 struct ica_xcRB xcRB;
 655                 if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB)))
 656                         return -EFAULT;
 657                 do {
 658                         rc = zcrypt_send_cprb(&xcRB);
 659                 } while (rc == -EAGAIN);
 660                 if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB)))
 661                         return -EFAULT;
 662                 return rc;
 663         }
 664         case Z90STAT_STATUS_MASK: {
 665                 char status[AP_DEVICES];
 666                 zcrypt_status_mask(status);
 667                 if (copy_to_user((char __user *) arg, status,
 668                                  sizeof(char) * AP_DEVICES))
 669                         return -EFAULT;
 670                 return 0;
 671         }
 672         case Z90STAT_QDEPTH_MASK: {
 673                 char qdepth[AP_DEVICES];
 674                 zcrypt_qdepth_mask(qdepth);
 675                 if (copy_to_user((char __user *) arg, qdepth,
 676                                  sizeof(char) * AP_DEVICES))
 677                         return -EFAULT;
 678                 return 0;
 679         }
 680         case Z90STAT_PERDEV_REQCNT: {
 681                 int reqcnt[AP_DEVICES];
 682                 zcrypt_perdev_reqcnt(reqcnt);
 683                 if (copy_to_user((int __user *) arg, reqcnt,
 684                                  sizeof(int) * AP_DEVICES))
 685                         return -EFAULT;
 686                 return 0;
 687         }
 688         case Z90STAT_REQUESTQ_COUNT:
 689                 return put_user(zcrypt_requestq_count(), (int __user *) arg);
 690         case Z90STAT_PENDINGQ_COUNT:
 691                 return put_user(zcrypt_pendingq_count(), (int __user *) arg);
 692         case Z90STAT_TOTALOPEN_COUNT:
 693                 return put_user(atomic_read(&zcrypt_open_count),
 694                                 (int __user *) arg);
 695         case Z90STAT_DOMAIN_INDEX:
 696                 return put_user(ap_domain_index, (int __user *) arg);
 697         /*
 698          * Deprecated ioctls. Don't add another device count ioctl,
 699          * you can count them yourself in the user space with the
 700          * output of the Z90STAT_STATUS_MASK ioctl.
 701          */
 702         case ICAZ90STATUS:
 703                 return zcrypt_ica_status(filp, arg);
 704         case Z90STAT_TOTALCOUNT:
 705                 return put_user(zcrypt_device_count, (int __user *) arg);
 706         case Z90STAT_PCICACOUNT:
 707                 return put_user(zcrypt_count_type(ZCRYPT_PCICA),
 708                                 (int __user *) arg);
 709         case Z90STAT_PCICCCOUNT:
 710                 return put_user(zcrypt_count_type(ZCRYPT_PCICC),
 711                                 (int __user *) arg);
 712         case Z90STAT_PCIXCCMCL2COUNT:
 713                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2),
 714                                 (int __user *) arg);
 715         case Z90STAT_PCIXCCMCL3COUNT:
 716                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
 717                                 (int __user *) arg);
 718         case Z90STAT_PCIXCCCOUNT:
 719                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2) +
 720                                 zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
 721                                 (int __user *) arg);
 722         case Z90STAT_CEX2CCOUNT:
 723                 return put_user(zcrypt_count_type(ZCRYPT_CEX2C),
 724                                 (int __user *) arg);
 725         case Z90STAT_CEX2ACOUNT:
 726                 return put_user(zcrypt_count_type(ZCRYPT_CEX2A),
 727                                 (int __user *) arg);
 728         default:
 729                 /* unknown ioctl number */
 730                 return -ENOIOCTLCMD;
 731         }
 732 }
 733
 734 #ifdef CONFIG_COMPAT
 735 /*
 736  * ioctl32 conversion routines
 737  */
 738 struct compat_ica_rsa_modexpo {
 739         compat_uptr_t   inputdata;
 740         unsigned int    inputdatalength;
 741         compat_uptr_t   outputdata;
 742         unsigned int    outputdatalength;
 743         compat_uptr_t   b_key;
 744         compat_uptr_t   n_modulus;
 745 };
 746
 747 static long trans_modexpo32(struct file *filp, unsigned int cmd,
 748                             unsigned long arg)
 749 {
 750         struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg);
 751         struct compat_ica_rsa_modexpo mex32;
 752         struct ica_rsa_modexpo mex64;
 753         long rc;
 754
 755         if (copy_from_user(&mex32, umex32, sizeof(mex32)))
 756                 return -EFAULT;
 757         mex64.inputdata = compat_ptr(mex32.inputdata);
 758         mex64.inputdatalength = mex32.inputdatalength;
 759         mex64.outputdata = compat_ptr(mex32.outputdata);
 760         mex64.outputdatalength = mex32.outputdatalength;
 761         mex64.b_key = compat_ptr(mex32.b_key);
 762         mex64.n_modulus = compat_ptr(mex32.n_modulus);
 763         do {
 764                 rc = zcrypt_rsa_modexpo(&mex64);
 765         } while (rc == -EAGAIN);
 766         if (!rc)
 767                 rc = put_user(mex64.outputdatalength,
 768                               &umex32->outputdatalength);
 769         return rc;
 770 }
 771
 772 struct compat_ica_rsa_modexpo_crt {
 773         compat_uptr_t   inputdata;
 774         unsigned int    inputdatalength;
 775         compat_uptr_t   outputdata;
 776         unsigned int    outputdatalength;
 777         compat_uptr_t   bp_key;
 778         compat_uptr_t   bq_key;
 779         compat_uptr_t   np_prime;
 780         compat_uptr_t   nq_prime;
 781         compat_uptr_t   u_mult_inv;
 782 };
 783
 784 static long trans_modexpo_crt32(struct file *filp, unsigned int cmd,
 785                                 unsigned long arg)
 786 {
 787         struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg);
 788         struct compat_ica_rsa_modexpo_crt crt32;
 789         struct ica_rsa_modexpo_crt crt64;
 790         long rc;
 791
 792         if (copy_from_user(&crt32, ucrt32, sizeof(crt32)))
 793                 return -EFAULT;
 794         crt64.inputdata = compat_ptr(crt32.inputdata);
 795         crt64.inputdatalength = crt32.inputdatalength;
 796         crt64.outputdata=  compat_ptr(crt32.outputdata);
 797         crt64.outputdatalength = crt32.outputdatalength;
 798         crt64.bp_key = compat_ptr(crt32.bp_key);
 799         crt64.bq_key = compat_ptr(crt32.bq_key);
 800         crt64.np_prime = compat_ptr(crt32.np_prime);
 801         crt64.nq_prime = compat_ptr(crt32.nq_prime);
 802         crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv);
 803         do {
 804                 rc = zcrypt_rsa_crt(&crt64);
 805         } while (rc == -EAGAIN);
 806         if (!rc)
 807                 rc = put_user(crt64.outputdatalength,
 808                               &ucrt32->outputdatalength);
 809         return rc;
 810 }
 811
 812 struct compat_ica_xcRB {
 813         unsigned short  agent_ID;
 814         unsigned int    user_defined;
 815         unsigned short  request_ID;
 816         unsigned int    request_control_blk_length;
 817         unsigned char   padding1[16 - sizeof (compat_uptr_t)];
 818         compat_uptr_t   request_control_blk_addr;
 819         unsigned int    request_data_length;
 820         char            padding2[16 - sizeof (compat_uptr_t)];
 821         compat_uptr_t   request_data_address;
 822         unsigned int    reply_control_blk_length;
 823         char            padding3[16 - sizeof (compat_uptr_t)];
 824         compat_uptr_t   reply_control_blk_addr;
 825         unsigned int    reply_data_length;
 826         char            padding4[16 - sizeof (compat_uptr_t)];
 827         compat_uptr_t   reply_data_addr;
 828         unsigned short  priority_window;
 829         unsigned int    status;
 830 } __attribute__((packed));
 831
 832 static long trans_xcRB32(struct file *filp, unsigned int cmd,
 833                          unsigned long arg)
 834 {
 835         struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg);
 836         struct compat_ica_xcRB xcRB32;
 837         struct ica_xcRB xcRB64;
 838         long rc;
 839
 840         if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32)))
 841                 return -EFAULT;
 842         xcRB64.agent_ID = xcRB32.agent_ID;
 843         xcRB64.user_defined = xcRB32.user_defined;
 844         xcRB64.request_ID = xcRB32.request_ID;
 845         xcRB64.request_control_blk_length =
 846                 xcRB32.request_control_blk_length;
 847         xcRB64.request_control_blk_addr =
 848                 compat_ptr(xcRB32.request_control_blk_addr);
 849         xcRB64.request_data_length =
 850                 xcRB32.request_data_length;
 851         xcRB64.request_data_address =
 852                 compat_ptr(xcRB32.request_data_address);
 853         xcRB64.reply_control_blk_length =
 854                 xcRB32.reply_control_blk_length;
 855         xcRB64.reply_control_blk_addr =
 856                 compat_ptr(xcRB32.reply_control_blk_addr);
 857         xcRB64.reply_data_length = xcRB32.reply_data_length;
 858         xcRB64.reply_data_addr =
 859                 compat_ptr(xcRB32.reply_data_addr);
 860         xcRB64.priority_window = xcRB32.priority_window;
 861         xcRB64.status = xcRB32.status;
 862         do {
 863                 rc = zcrypt_send_cprb(&xcRB64);
 864         } while (rc == -EAGAIN);
 865         xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length;
 866         xcRB32.reply_data_length = xcRB64.reply_data_length;
 867         xcRB32.status = xcRB64.status;
 868         if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32)))
 869                         return -EFAULT;
 870         return rc;
 871 }
 872
 873 static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd,
 874                          unsigned long arg)
 875 {
 876         if (cmd == ICARSAMODEXPO)
 877                 return trans_modexpo32(filp, cmd, arg);
 878         if (cmd == ICARSACRT)
 879                 return trans_modexpo_crt32(filp, cmd, arg);
 880         if (cmd == ZSECSENDCPRB)
 881                 return trans_xcRB32(filp, cmd, arg);
 882         return zcrypt_unlocked_ioctl(filp, cmd, arg);
 883 }
 884 #endif
 885
 886 /*
 887  * Misc device file operations.
 888  */
 889 static const struct file_operations zcrypt_fops = {
 890         .owner          = THIS_MODULE,
 891         .read           = zcrypt_read,
 892         .write          = zcrypt_write,
 893         .unlocked_ioctl = zcrypt_unlocked_ioctl,
 894 #ifdef CONFIG_COMPAT
 895         .compat_ioctl   = zcrypt_compat_ioctl,
 896 #endif
 897         .open           = zcrypt_open,
 898         .release        = zcrypt_release
 899 };
 900
 901 /*
 902  * Misc device.
 903  */
 904 static struct miscdevice zcrypt_misc_device = {
 905         .minor      = MISC_DYNAMIC_MINOR,
 906         .name       = "z90crypt",
 907         .fops       = &zcrypt_fops,
 908 };
 909
 910 /*
 911  * Deprecated /proc entry support.
 912  */
 913 static struct proc_dir_entry *zcrypt_entry;
 914
 915 static int sprintcl(unsigned char *outaddr, unsigned char *addr,
 916                     unsigned int len)
 917 {
 918         int hl, i;
 919
 920         hl = 0;
 921         for (i = 0; i < len; i++)
 922                 hl += sprintf(outaddr+hl, "%01x", (unsigned int) addr[i]);
 923         hl += sprintf(outaddr+hl, " ");
 924         return hl;
 925 }
 926
 927 static int sprintrw(unsigned char *outaddr, unsigned char *addr,
 928                     unsigned int len)
 929 {
 930         int hl, inl, c, cx;
 931
 932         hl = sprintf(outaddr, "    ");
 933         inl = 0;
 934         for (c = 0; c < (len / 16); c++) {
 935                 hl += sprintcl(outaddr+hl, addr+inl, 16);
 936                 inl += 16;
 937         }
 938         cx = len%16;
 939         if (cx) {
 940                 hl += sprintcl(outaddr+hl, addr+inl, cx);
 941                 inl += cx;
 942         }
 943         hl += sprintf(outaddr+hl, "\n");
 944         return hl;
 945 }
 946
 947 static int sprinthx(unsigned char *title, unsigned char *outaddr,
 948                     unsigned char *addr, unsigned int len)
 949 {
 950         int hl, inl, r, rx;
 951
 952         hl = sprintf(outaddr, "\n%s\n", title);
 953         inl = 0;
 954         for (r = 0; r < (len / 64); r++) {
 955                 hl += sprintrw(outaddr+hl, addr+inl, 64);
 956                 inl += 64;
 957         }
 958         rx = len % 64;
 959         if (rx) {
 960                 hl += sprintrw(outaddr+hl, addr+inl, rx);
 961                 inl += rx;
 962         }
 963         hl += sprintf(outaddr+hl, "\n");
 964         return hl;
 965 }
 966
 967 static int sprinthx4(unsigned char *title, unsigned char *outaddr,
 968                      unsigned int *array, unsigned int len)
 969 {
 970         int hl, r;
 971
 972         hl = sprintf(outaddr, "\n%s\n", title);
 973         for (r = 0; r < len; r++) {
 974                 if ((r % 8) == 0)
 975                         hl += sprintf(outaddr+hl, "    ");
 976                 hl += sprintf(outaddr+hl, "%08X ", array[r]);
 977                 if ((r % 8) == 7)
 978                         hl += sprintf(outaddr+hl, "\n");
 979         }
 980         hl += sprintf(outaddr+hl, "\n");
 981         return hl;
 982 }
 983
 984 static int zcrypt_status_read(char *resp_buff, char **start, off_t offset,
 985                               int count, int *eof, void *data)
 986 {
 987         unsigned char *workarea;
 988         int len;
 989
 990         len = 0;
 991
 992         /* resp_buff is a page. Use the right half for a work area */
 993         workarea = resp_buff + 2000;
 994         len += sprintf(resp_buff + len, "\nzcrypt version: %d.%d.%d\n",
 995                 ZCRYPT_VERSION, ZCRYPT_RELEASE, ZCRYPT_VARIANT);
 996         len += sprintf(resp_buff + len, "Cryptographic domain: %d\n",
 997                        ap_domain_index);
 998         len += sprintf(resp_buff + len, "Total device count: %d\n",
 999                        zcrypt_device_count);
1000         len += sprintf(resp_buff + len, "PCICA count: %d\n",
1001                        zcrypt_count_type(ZCRYPT_PCICA));
1002         len += sprintf(resp_buff + len, "PCICC count: %d\n",
1003                        zcrypt_count_type(ZCRYPT_PCICC));
1004         len += sprintf(resp_buff + len, "PCIXCC MCL2 count: %d\n",
1005                        zcrypt_count_type(ZCRYPT_PCIXCC_MCL2));
1006         len += sprintf(resp_buff + len, "PCIXCC MCL3 count: %d\n",
1007                        zcrypt_count_type(ZCRYPT_PCIXCC_MCL3));
1008         len += sprintf(resp_buff + len, "CEX2C count: %d\n",
1009                        zcrypt_count_type(ZCRYPT_CEX2C));
1010         len += sprintf(resp_buff + len, "CEX2A count: %d\n",
1011                        zcrypt_count_type(ZCRYPT_CEX2A));
1012         len += sprintf(resp_buff + len, "CEX3C count: %d\n",
1013                        zcrypt_count_type(ZCRYPT_CEX3C));
1014         len += sprintf(resp_buff + len, "CEX3A count: %d\n",
1015                        zcrypt_count_type(ZCRYPT_CEX3A));
1016         len += sprintf(resp_buff + len, "requestq count: %d\n",
1017                        zcrypt_requestq_count());
1018         len += sprintf(resp_buff + len, "pendingq count: %d\n",
1019                        zcrypt_pendingq_count());
1020         len += sprintf(resp_buff + len, "Total open handles: %d\n\n",
1021                        atomic_read(&zcrypt_open_count));
1022         zcrypt_status_mask(workarea);
1023         len += sprinthx("Online devices: 1=PCICA 2=PCICC 3=PCIXCC(MCL2) "
1024                         "4=PCIXCC(MCL3) 5=CEX2C 6=CEX2A 7=CEX3C 8=CEX3A",
1025                         resp_buff+len, workarea, AP_DEVICES);
1026         zcrypt_qdepth_mask(workarea);
1027         len += sprinthx("Waiting work element counts",
1028                         resp_buff+len, workarea, AP_DEVICES);
1029         zcrypt_perdev_reqcnt((int *) workarea);
1030         len += sprinthx4("Per-device successfully completed request counts",
1031                          resp_buff+len,(unsigned int *) workarea, AP_DEVICES);
1032         *eof = 1;
1033         memset((void *) workarea, 0x00, AP_DEVICES * sizeof(unsigned int));
1034         return len;
1035 }
1036
1037 static void zcrypt_disable_card(int index)
1038 {
1039         struct zcrypt_device *zdev;
1040
1041         spin_lock_bh(&zcrypt_device_lock);
1042         list_for_each_entry(zdev, &zcrypt_device_list, list)
1043                 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
1044                         zdev->online = 0;
1045                         ap_flush_queue(zdev->ap_dev);
1046                         break;
1047                 }
1048         spin_unlock_bh(&zcrypt_device_lock);
1049 }
1050
1051 static void zcrypt_enable_card(int index)
1052 {
1053         struct zcrypt_device *zdev;
1054
1055         spin_lock_bh(&zcrypt_device_lock);
1056         list_for_each_entry(zdev, &zcrypt_device_list, list)
1057                 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
1058                         zdev->online = 1;
1059                         break;
1060                 }
1061         spin_unlock_bh(&zcrypt_device_lock);
1062 }
1063
1064 static int zcrypt_status_write(struct file *file, const char __user *buffer,
1065                                unsigned long count, void *data)
1066 {
1067         unsigned char *lbuf, *ptr;
1068         unsigned long local_count;
1069         int j;
1070
1071         if (count <= 0)
1072                 return 0;
1073
1074 #define LBUFSIZE 1200UL
1075         lbuf = kmalloc(LBUFSIZE, GFP_KERNEL);
1076         if (!lbuf)
1077                 return 0;
1078
1079         local_count = min(LBUFSIZE - 1, count);
1080         if (copy_from_user(lbuf, buffer, local_count) != 0) {
1081                 kfree(lbuf);
1082                 return -EFAULT;
1083         }
1084         lbuf[local_count] = '\0';
1085
1086         ptr = strstr(lbuf, "Online devices");
1087         if (!ptr)
1088                 goto out;
1089         ptr = strstr(ptr, "\n");
1090         if (!ptr)
1091                 goto out;
1092         ptr++;
1093
1094         if (strstr(ptr, "Waiting work element counts") == NULL)
1095                 goto out;
1096
1097         for (j = 0; j < 64 && *ptr; ptr++) {
1098                 /*
1099                  * '0' for no device, '1' for PCICA, '2' for PCICC,
1100                  * '3' for PCIXCC_MCL2, '4' for PCIXCC_MCL3,
1101                  * '5' for CEX2C and '6' for CEX2A'
1102                  * '7' for CEX3C and '8' for CEX3A
1103                  */
1104                 if (*ptr >= '0' && *ptr <= '8')
1105                         j++;
1106                 else if (*ptr == 'd' || *ptr == 'D')
1107                         zcrypt_disable_card(j++);
1108                 else if (*ptr == 'e' || *ptr == 'E')
1109                         zcrypt_enable_card(j++);
1110                 else if (*ptr != ' ' && *ptr != '\t')
1111                         break;
1112         }
1113 out:
1114         kfree(lbuf);
1115         return count;
1116 }
1117
1118 static int zcrypt_rng_device_count;
1119 static u32 *zcrypt_rng_buffer;
1120 static int zcrypt_rng_buffer_index;
1121 static DEFINE_MUTEX(zcrypt_rng_mutex);
1122
1123 static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
1124 {
1125         int rc;
1126
1127         /*
1128          * We don't need locking here because the RNG API guarantees serialized
1129          * read method calls.
1130          */
1131         if (zcrypt_rng_buffer_index == 0) {
1132                 rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1133                 if (rc < 0)
1134                         return -EIO;
1135                 zcrypt_rng_buffer_index = rc / sizeof *data;
1136         }
1137         *data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index];
1138         return sizeof *data;
1139 }
1140
1141 static struct hwrng zcrypt_rng_dev = {
1142         .name           = "zcrypt",
1143         .data_read      = zcrypt_rng_data_read,
1144 };
1145
1146 static int zcrypt_rng_device_add(void)
1147 {
1148         int rc = 0;
1149
1150         mutex_lock(&zcrypt_rng_mutex);
1151         if (zcrypt_rng_device_count == 0) {
1152                 zcrypt_rng_buffer = (u32 *) get_zeroed_page(GFP_KERNEL);
1153                 if (!zcrypt_rng_buffer) {
1154                         rc = -ENOMEM;
1155                         goto out;
1156                 }
1157                 zcrypt_rng_buffer_index = 0;
1158                 rc = hwrng_register(&zcrypt_rng_dev);
1159                 if (rc)
1160                         goto out_free;
1161                 zcrypt_rng_device_count = 1;
1162         } else
1163                 zcrypt_rng_device_count++;
1164         mutex_unlock(&zcrypt_rng_mutex);
1165         return 0;
1166
1167 out_free:
1168         free_page((unsigned long) zcrypt_rng_buffer);
1169 out:
1170         mutex_unlock(&zcrypt_rng_mutex);
1171         return rc;
1172 }
1173
1174 static void zcrypt_rng_device_remove(void)
1175 {
1176         mutex_lock(&zcrypt_rng_mutex);
1177         zcrypt_rng_device_count--;
1178         if (zcrypt_rng_device_count == 0) {
1179                 hwrng_unregister(&zcrypt_rng_dev);
1180                 free_page((unsigned long) zcrypt_rng_buffer);
1181         }
1182         mutex_unlock(&zcrypt_rng_mutex);
1183 }
1184
1185 /**
1186  * zcrypt_api_init(): Module initialization.
1187  *
1188  * The module initialization code.
1189  */
1190 int __init zcrypt_api_init(void)
1191 {
1192         int rc;
1193
1194         /* Register the request sprayer. */
1195         rc = misc_register(&zcrypt_misc_device);
1196         if (rc < 0)
1197                 goto out;
1198
1199         /* Set up the proc file system */
1200         zcrypt_entry = create_proc_entry("driver/z90crypt", 0644, NULL);
1201         if (!zcrypt_entry) {
1202                 rc = -ENOMEM;
1203                 goto out_misc;
1204         }
1205         zcrypt_entry->data = NULL;
1206         zcrypt_entry->read_proc = zcrypt_status_read;
1207         zcrypt_entry->write_proc = zcrypt_status_write;
1208
1209         return 0;
1210
1211 out_misc:
1212         misc_deregister(&zcrypt_misc_device);
1213 out:
1214         return rc;
1215 }
1216
1217 /**
1218  * zcrypt_api_exit(): Module termination.
1219  *
1220  * The module termination code.
1221  */
1222 void zcrypt_api_exit(void)
1223 {
1224         remove_proc_entry("driver/z90crypt", NULL);
1225         misc_deregister(&zcrypt_misc_device);
1226 }
1227
1228 #ifndef CONFIG_ZCRYPT_MONOLITHIC
1229 module_init(zcrypt_api_init);
1230 module_exit(zcrypt_api_exit);
1231 #endif