drivers/s390/crypto/zcrypt_api.c

   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                                 int len;
 397                                 spin_unlock_bh(&zcrypt_device_lock);
 398                                 /* len is max 256 / 2 - 120 = 8 */
 399                                 len = crt->inputdatalength / 2 - 120;
 400                                 z1 = z2 = z3 = 0;
 401                                 if (copy_from_user(&z1, crt->np_prime, len) ||
 402                                     copy_from_user(&z2, crt->bp_key, len) ||
 403                                     copy_from_user(&z3, crt->u_mult_inv, len))
 404                                         return -EFAULT;
 405                                 copied = 1;
 406                                 /*
 407                                  * We have to restart device lookup -
 408                                  * the device list may have changed by now.
 409                                  */
 410                                 goto restart;
 411                         }
 412                         if (z1 != 0ULL || z2 != 0ULL || z3 != 0ULL)
 413                                 /* The device can't handle this request. */
 414                                 continue;
 415                 }
 416                 zcrypt_device_get(zdev);
 417                 get_device(&zdev->ap_dev->device);
 418                 zdev->request_count++;
 419                 __zcrypt_decrease_preference(zdev);
 420                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 421                         spin_unlock_bh(&zcrypt_device_lock);
 422                         rc = zdev->ops->rsa_modexpo_crt(zdev, crt);
 423                         spin_lock_bh(&zcrypt_device_lock);
 424                         module_put(zdev->ap_dev->drv->driver.owner);
 425                 }
 426                 else
 427                         rc = -EAGAIN;
 428                 zdev->request_count--;
 429                 __zcrypt_increase_preference(zdev);
 430                 put_device(&zdev->ap_dev->device);
 431                 zcrypt_device_put(zdev);
 432                 spin_unlock_bh(&zcrypt_device_lock);
 433                 return rc;
 434         }
 435         spin_unlock_bh(&zcrypt_device_lock);
 436         return -ENODEV;
 437 }
 438
 439 static long zcrypt_send_cprb(struct ica_xcRB *xcRB)
 440 {
 441         struct zcrypt_device *zdev;
 442         int rc;
 443
 444         spin_lock_bh(&zcrypt_device_lock);
 445         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 446                 if (!zdev->online || !zdev->ops->send_cprb ||
 447                     (xcRB->user_defined != AUTOSELECT &&
 448                         AP_QID_DEVICE(zdev->ap_dev->qid) != xcRB->user_defined)
 449                     )
 450                         continue;
 451                 zcrypt_device_get(zdev);
 452                 get_device(&zdev->ap_dev->device);
 453                 zdev->request_count++;
 454                 __zcrypt_decrease_preference(zdev);
 455                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 456                         spin_unlock_bh(&zcrypt_device_lock);
 457                         rc = zdev->ops->send_cprb(zdev, xcRB);
 458                         spin_lock_bh(&zcrypt_device_lock);
 459                         module_put(zdev->ap_dev->drv->driver.owner);
 460                 }
 461                 else
 462                         rc = -EAGAIN;
 463                 zdev->request_count--;
 464                 __zcrypt_increase_preference(zdev);
 465                 put_device(&zdev->ap_dev->device);
 466                 zcrypt_device_put(zdev);
 467                 spin_unlock_bh(&zcrypt_device_lock);
 468                 return rc;
 469         }
 470         spin_unlock_bh(&zcrypt_device_lock);
 471         return -ENODEV;
 472 }
 473
 474 static long zcrypt_rng(char *buffer)
 475 {
 476         struct zcrypt_device *zdev;
 477         int rc;
 478
 479         spin_lock_bh(&zcrypt_device_lock);
 480         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 481                 if (!zdev->online || !zdev->ops->rng)
 482                         continue;
 483                 zcrypt_device_get(zdev);
 484                 get_device(&zdev->ap_dev->device);
 485                 zdev->request_count++;
 486                 __zcrypt_decrease_preference(zdev);
 487                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 488                         spin_unlock_bh(&zcrypt_device_lock);
 489                         rc = zdev->ops->rng(zdev, buffer);
 490                         spin_lock_bh(&zcrypt_device_lock);
 491                         module_put(zdev->ap_dev->drv->driver.owner);
 492                 } else
 493                         rc = -EAGAIN;
 494                 zdev->request_count--;
 495                 __zcrypt_increase_preference(zdev);
 496                 put_device(&zdev->ap_dev->device);
 497                 zcrypt_device_put(zdev);
 498                 spin_unlock_bh(&zcrypt_device_lock);
 499                 return rc;
 500         }
 501         spin_unlock_bh(&zcrypt_device_lock);
 502         return -ENODEV;
 503 }
 504
 505 static void zcrypt_status_mask(char status[AP_DEVICES])
 506 {
 507         struct zcrypt_device *zdev;
 508
 509         memset(status, 0, sizeof(char) * AP_DEVICES);
 510         spin_lock_bh(&zcrypt_device_lock);
 511         list_for_each_entry(zdev, &zcrypt_device_list, list)
 512                 status[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 513                         zdev->online ? zdev->user_space_type : 0x0d;
 514         spin_unlock_bh(&zcrypt_device_lock);
 515 }
 516
 517 static void zcrypt_qdepth_mask(char qdepth[AP_DEVICES])
 518 {
 519         struct zcrypt_device *zdev;
 520
 521         memset(qdepth, 0, sizeof(char)  * AP_DEVICES);
 522         spin_lock_bh(&zcrypt_device_lock);
 523         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 524                 spin_lock(&zdev->ap_dev->lock);
 525                 qdepth[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 526                         zdev->ap_dev->pendingq_count +
 527                         zdev->ap_dev->requestq_count;
 528                 spin_unlock(&zdev->ap_dev->lock);
 529         }
 530         spin_unlock_bh(&zcrypt_device_lock);
 531 }
 532
 533 static void zcrypt_perdev_reqcnt(int reqcnt[AP_DEVICES])
 534 {
 535         struct zcrypt_device *zdev;
 536
 537         memset(reqcnt, 0, sizeof(int) * AP_DEVICES);
 538         spin_lock_bh(&zcrypt_device_lock);
 539         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 540                 spin_lock(&zdev->ap_dev->lock);
 541                 reqcnt[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 542                         zdev->ap_dev->total_request_count;
 543                 spin_unlock(&zdev->ap_dev->lock);
 544         }
 545         spin_unlock_bh(&zcrypt_device_lock);
 546 }
 547
 548 static int zcrypt_pendingq_count(void)
 549 {
 550         struct zcrypt_device *zdev;
 551         int pendingq_count = 0;
 552
 553         spin_lock_bh(&zcrypt_device_lock);
 554         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 555                 spin_lock(&zdev->ap_dev->lock);
 556                 pendingq_count += zdev->ap_dev->pendingq_count;
 557                 spin_unlock(&zdev->ap_dev->lock);
 558         }
 559         spin_unlock_bh(&zcrypt_device_lock);
 560         return pendingq_count;
 561 }
 562
 563 static int zcrypt_requestq_count(void)
 564 {
 565         struct zcrypt_device *zdev;
 566         int requestq_count = 0;
 567
 568         spin_lock_bh(&zcrypt_device_lock);
 569         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 570                 spin_lock(&zdev->ap_dev->lock);
 571                 requestq_count += zdev->ap_dev->requestq_count;
 572                 spin_unlock(&zdev->ap_dev->lock);
 573         }
 574         spin_unlock_bh(&zcrypt_device_lock);
 575         return requestq_count;
 576 }
 577
 578 static int zcrypt_count_type(int type)
 579 {
 580         struct zcrypt_device *zdev;
 581         int device_count = 0;
 582
 583         spin_lock_bh(&zcrypt_device_lock);
 584         list_for_each_entry(zdev, &zcrypt_device_list, list)
 585                 if (zdev->user_space_type == type)
 586                         device_count++;
 587         spin_unlock_bh(&zcrypt_device_lock);
 588         return device_count;
 589 }
 590
 591 /**
 592  * zcrypt_ica_status(): Old, depracted combi status call.
 593  *
 594  * Old, deprecated combi status call.
 595  */
 596 static long zcrypt_ica_status(struct file *filp, unsigned long arg)
 597 {
 598         struct ica_z90_status *pstat;
 599         int ret;
 600
 601         pstat = kzalloc(sizeof(*pstat), GFP_KERNEL);
 602         if (!pstat)
 603                 return -ENOMEM;
 604         pstat->totalcount = zcrypt_device_count;
 605         pstat->leedslitecount = zcrypt_count_type(ZCRYPT_PCICA);
 606         pstat->leeds2count = zcrypt_count_type(ZCRYPT_PCICC);
 607         pstat->requestqWaitCount = zcrypt_requestq_count();
 608         pstat->pendingqWaitCount = zcrypt_pendingq_count();
 609         pstat->totalOpenCount = atomic_read(&zcrypt_open_count);
 610         pstat->cryptoDomain = ap_domain_index;
 611         zcrypt_status_mask(pstat->status);
 612         zcrypt_qdepth_mask(pstat->qdepth);
 613         ret = 0;
 614         if (copy_to_user((void __user *) arg, pstat, sizeof(*pstat)))
 615                 ret = -EFAULT;
 616         kfree(pstat);
 617         return ret;
 618 }
 619
 620 static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
 621                                   unsigned long arg)
 622 {
 623         int rc;
 624
 625         switch (cmd) {
 626         case ICARSAMODEXPO: {
 627                 struct ica_rsa_modexpo __user *umex = (void __user *) arg;
 628                 struct ica_rsa_modexpo mex;
 629                 if (copy_from_user(&mex, umex, sizeof(mex)))
 630                         return -EFAULT;
 631                 do {
 632                         rc = zcrypt_rsa_modexpo(&mex);
 633                 } while (rc == -EAGAIN);
 634                 if (rc)
 635                         return rc;
 636                 return put_user(mex.outputdatalength, &umex->outputdatalength);
 637         }
 638         case ICARSACRT: {
 639                 struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg;
 640                 struct ica_rsa_modexpo_crt crt;
 641                 if (copy_from_user(&crt, ucrt, sizeof(crt)))
 642                         return -EFAULT;
 643                 do {
 644                         rc = zcrypt_rsa_crt(&crt);
 645                 } while (rc == -EAGAIN);
 646                 if (rc)
 647                         return rc;
 648                 return put_user(crt.outputdatalength, &ucrt->outputdatalength);
 649         }
 650         case ZSECSENDCPRB: {
 651                 struct ica_xcRB __user *uxcRB = (void __user *) arg;
 652                 struct ica_xcRB xcRB;
 653                 if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB)))
 654                         return -EFAULT;
 655                 do {
 656                         rc = zcrypt_send_cprb(&xcRB);
 657                 } while (rc == -EAGAIN);
 658                 if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB)))
 659                         return -EFAULT;
 660                 return rc;
 661         }
 662         case Z90STAT_STATUS_MASK: {
 663                 char status[AP_DEVICES];
 664                 zcrypt_status_mask(status);
 665                 if (copy_to_user((char __user *) arg, status,
 666                                  sizeof(char) * AP_DEVICES))
 667                         return -EFAULT;
 668                 return 0;
 669         }
 670         case Z90STAT_QDEPTH_MASK: {
 671                 char qdepth[AP_DEVICES];
 672                 zcrypt_qdepth_mask(qdepth);
 673                 if (copy_to_user((char __user *) arg, qdepth,
 674                                  sizeof(char) * AP_DEVICES))
 675                         return -EFAULT;
 676                 return 0;
 677         }
 678         case Z90STAT_PERDEV_REQCNT: {
 679                 int reqcnt[AP_DEVICES];
 680                 zcrypt_perdev_reqcnt(reqcnt);
 681                 if (copy_to_user((int __user *) arg, reqcnt,
 682                                  sizeof(int) * AP_DEVICES))
 683                         return -EFAULT;
 684                 return 0;
 685         }
 686         case Z90STAT_REQUESTQ_COUNT:
 687                 return put_user(zcrypt_requestq_count(), (int __user *) arg);
 688         case Z90STAT_PENDINGQ_COUNT:
 689                 return put_user(zcrypt_pendingq_count(), (int __user *) arg);
 690         case Z90STAT_TOTALOPEN_COUNT:
 691                 return put_user(atomic_read(&zcrypt_open_count),
 692                                 (int __user *) arg);
 693         case Z90STAT_DOMAIN_INDEX:
 694                 return put_user(ap_domain_index, (int __user *) arg);
 695         /*
 696          * Deprecated ioctls. Don't add another device count ioctl,
 697          * you can count them yourself in the user space with the
 698          * output of the Z90STAT_STATUS_MASK ioctl.
 699          */
 700         case ICAZ90STATUS:
 701                 return zcrypt_ica_status(filp, arg);
 702         case Z90STAT_TOTALCOUNT:
 703                 return put_user(zcrypt_device_count, (int __user *) arg);
 704         case Z90STAT_PCICACOUNT:
 705                 return put_user(zcrypt_count_type(ZCRYPT_PCICA),
 706                                 (int __user *) arg);
 707         case Z90STAT_PCICCCOUNT:
 708                 return put_user(zcrypt_count_type(ZCRYPT_PCICC),
 709                                 (int __user *) arg);
 710         case Z90STAT_PCIXCCMCL2COUNT:
 711                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2),
 712                                 (int __user *) arg);
 713         case Z90STAT_PCIXCCMCL3COUNT:
 714                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
 715                                 (int __user *) arg);
 716         case Z90STAT_PCIXCCCOUNT:
 717                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2) +
 718                                 zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
 719                                 (int __user *) arg);
 720         case Z90STAT_CEX2CCOUNT:
 721                 return put_user(zcrypt_count_type(ZCRYPT_CEX2C),
 722                                 (int __user *) arg);
 723         case Z90STAT_CEX2ACOUNT:
 724                 return put_user(zcrypt_count_type(ZCRYPT_CEX2A),
 725                                 (int __user *) arg);
 726         default:
 727                 /* unknown ioctl number */
 728                 return -ENOIOCTLCMD;
 729         }
 730 }
 731
 732 #ifdef CONFIG_COMPAT
 733 /*
 734  * ioctl32 conversion routines
 735  */
 736 struct compat_ica_rsa_modexpo {
 737         compat_uptr_t   inputdata;
 738         unsigned int    inputdatalength;
 739         compat_uptr_t   outputdata;
 740         unsigned int    outputdatalength;
 741         compat_uptr_t   b_key;
 742         compat_uptr_t   n_modulus;
 743 };
 744
 745 static long trans_modexpo32(struct file *filp, unsigned int cmd,
 746                             unsigned long arg)
 747 {
 748         struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg);
 749         struct compat_ica_rsa_modexpo mex32;
 750         struct ica_rsa_modexpo mex64;
 751         long rc;
 752
 753         if (copy_from_user(&mex32, umex32, sizeof(mex32)))
 754                 return -EFAULT;
 755         mex64.inputdata = compat_ptr(mex32.inputdata);
 756         mex64.inputdatalength = mex32.inputdatalength;
 757         mex64.outputdata = compat_ptr(mex32.outputdata);
 758         mex64.outputdatalength = mex32.outputdatalength;
 759         mex64.b_key = compat_ptr(mex32.b_key);
 760         mex64.n_modulus = compat_ptr(mex32.n_modulus);
 761         do {
 762                 rc = zcrypt_rsa_modexpo(&mex64);
 763         } while (rc == -EAGAIN);
 764         if (!rc)
 765                 rc = put_user(mex64.outputdatalength,
 766                               &umex32->outputdatalength);
 767         return rc;
 768 }
 769
 770 struct compat_ica_rsa_modexpo_crt {
 771         compat_uptr_t   inputdata;
 772         unsigned int    inputdatalength;
 773         compat_uptr_t   outputdata;
 774         unsigned int    outputdatalength;
 775         compat_uptr_t   bp_key;
 776         compat_uptr_t   bq_key;
 777         compat_uptr_t   np_prime;
 778         compat_uptr_t   nq_prime;
 779         compat_uptr_t   u_mult_inv;
 780 };
 781
 782 static long trans_modexpo_crt32(struct file *filp, unsigned int cmd,
 783                                 unsigned long arg)
 784 {
 785         struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg);
 786         struct compat_ica_rsa_modexpo_crt crt32;
 787         struct ica_rsa_modexpo_crt crt64;
 788         long rc;
 789
 790         if (copy_from_user(&crt32, ucrt32, sizeof(crt32)))
 791                 return -EFAULT;
 792         crt64.inputdata = compat_ptr(crt32.inputdata);
 793         crt64.inputdatalength = crt32.inputdatalength;
 794         crt64.outputdata=  compat_ptr(crt32.outputdata);
 795         crt64.outputdatalength = crt32.outputdatalength;
 796         crt64.bp_key = compat_ptr(crt32.bp_key);
 797         crt64.bq_key = compat_ptr(crt32.bq_key);
 798         crt64.np_prime = compat_ptr(crt32.np_prime);
 799         crt64.nq_prime = compat_ptr(crt32.nq_prime);
 800         crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv);
 801         do {
 802                 rc = zcrypt_rsa_crt(&crt64);
 803         } while (rc == -EAGAIN);
 804         if (!rc)
 805                 rc = put_user(crt64.outputdatalength,
 806                               &ucrt32->outputdatalength);
 807         return rc;
 808 }
 809
 810 struct compat_ica_xcRB {
 811         unsigned short  agent_ID;
 812         unsigned int    user_defined;
 813         unsigned short  request_ID;
 814         unsigned int    request_control_blk_length;
 815         unsigned char   padding1[16 - sizeof (compat_uptr_t)];
 816         compat_uptr_t   request_control_blk_addr;
 817         unsigned int    request_data_length;
 818         char            padding2[16 - sizeof (compat_uptr_t)];
 819         compat_uptr_t   request_data_address;
 820         unsigned int    reply_control_blk_length;
 821         char            padding3[16 - sizeof (compat_uptr_t)];
 822         compat_uptr_t   reply_control_blk_addr;
 823         unsigned int    reply_data_length;
 824         char            padding4[16 - sizeof (compat_uptr_t)];
 825         compat_uptr_t   reply_data_addr;
 826         unsigned short  priority_window;
 827         unsigned int    status;
 828 } __attribute__((packed));
 829
 830 static long trans_xcRB32(struct file *filp, unsigned int cmd,
 831                          unsigned long arg)
 832 {
 833         struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg);
 834         struct compat_ica_xcRB xcRB32;
 835         struct ica_xcRB xcRB64;
 836         long rc;
 837
 838         if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32)))
 839                 return -EFAULT;
 840         xcRB64.agent_ID = xcRB32.agent_ID;
 841         xcRB64.user_defined = xcRB32.user_defined;
 842         xcRB64.request_ID = xcRB32.request_ID;
 843         xcRB64.request_control_blk_length =
 844                 xcRB32.request_control_blk_length;
 845         xcRB64.request_control_blk_addr =
 846                 compat_ptr(xcRB32.request_control_blk_addr);
 847         xcRB64.request_data_length =
 848                 xcRB32.request_data_length;
 849         xcRB64.request_data_address =
 850                 compat_ptr(xcRB32.request_data_address);
 851         xcRB64.reply_control_blk_length =
 852                 xcRB32.reply_control_blk_length;
 853         xcRB64.reply_control_blk_addr =
 854                 compat_ptr(xcRB32.reply_control_blk_addr);
 855         xcRB64.reply_data_length = xcRB32.reply_data_length;
 856         xcRB64.reply_data_addr =
 857                 compat_ptr(xcRB32.reply_data_addr);
 858         xcRB64.priority_window = xcRB32.priority_window;
 859         xcRB64.status = xcRB32.status;
 860         do {
 861                 rc = zcrypt_send_cprb(&xcRB64);
 862         } while (rc == -EAGAIN);
 863         xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length;
 864         xcRB32.reply_data_length = xcRB64.reply_data_length;
 865         xcRB32.status = xcRB64.status;
 866         if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32)))
 867                         return -EFAULT;
 868         return rc;
 869 }
 870
 871 static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd,
 872                          unsigned long arg)
 873 {
 874         if (cmd == ICARSAMODEXPO)
 875                 return trans_modexpo32(filp, cmd, arg);
 876         if (cmd == ICARSACRT)
 877                 return trans_modexpo_crt32(filp, cmd, arg);
 878         if (cmd == ZSECSENDCPRB)
 879                 return trans_xcRB32(filp, cmd, arg);
 880         return zcrypt_unlocked_ioctl(filp, cmd, arg);
 881 }
 882 #endif
 883
 884 /*
 885  * Misc device file operations.
 886  */
 887 static const struct file_operations zcrypt_fops = {
 888         .owner          = THIS_MODULE,
 889         .read           = zcrypt_read,
 890         .write          = zcrypt_write,
 891         .unlocked_ioctl = zcrypt_unlocked_ioctl,
 892 #ifdef CONFIG_COMPAT
 893         .compat_ioctl   = zcrypt_compat_ioctl,
 894 #endif
 895         .open           = zcrypt_open,
 896         .release        = zcrypt_release
 897 };
 898
 899 /*
 900  * Misc device.
 901  */
 902 static struct miscdevice zcrypt_misc_device = {
 903         .minor      = MISC_DYNAMIC_MINOR,
 904         .name       = "z90crypt",
 905         .fops       = &zcrypt_fops,
 906 };
 907
 908 /*
 909  * Deprecated /proc entry support.
 910  */
 911 static struct proc_dir_entry *zcrypt_entry;
 912
 913 static int sprintcl(unsigned char *outaddr, unsigned char *addr,
 914                     unsigned int len)
 915 {
 916         int hl, i;
 917
 918         hl = 0;
 919         for (i = 0; i < len; i++)
 920                 hl += sprintf(outaddr+hl, "%01x", (unsigned int) addr[i]);
 921         hl += sprintf(outaddr+hl, " ");
 922         return hl;
 923 }
 924
 925 static int sprintrw(unsigned char *outaddr, unsigned char *addr,
 926                     unsigned int len)
 927 {
 928         int hl, inl, c, cx;
 929
 930         hl = sprintf(outaddr, "    ");
 931         inl = 0;
 932         for (c = 0; c < (len / 16); c++) {
 933                 hl += sprintcl(outaddr+hl, addr+inl, 16);
 934                 inl += 16;
 935         }
 936         cx = len%16;
 937         if (cx) {
 938                 hl += sprintcl(outaddr+hl, addr+inl, cx);
 939                 inl += cx;
 940         }
 941         hl += sprintf(outaddr+hl, "\n");
 942         return hl;
 943 }
 944
 945 static int sprinthx(unsigned char *title, unsigned char *outaddr,
 946                     unsigned char *addr, unsigned int len)
 947 {
 948         int hl, inl, r, rx;
 949
 950         hl = sprintf(outaddr, "\n%s\n", title);
 951         inl = 0;
 952         for (r = 0; r < (len / 64); r++) {
 953                 hl += sprintrw(outaddr+hl, addr+inl, 64);
 954                 inl += 64;
 955         }
 956         rx = len % 64;
 957         if (rx) {
 958                 hl += sprintrw(outaddr+hl, addr+inl, rx);
 959                 inl += rx;
 960         }
 961         hl += sprintf(outaddr+hl, "\n");
 962         return hl;
 963 }
 964
 965 static int sprinthx4(unsigned char *title, unsigned char *outaddr,
 966                      unsigned int *array, unsigned int len)
 967 {
 968         int hl, r;
 969
 970         hl = sprintf(outaddr, "\n%s\n", title);
 971         for (r = 0; r < len; r++) {
 972                 if ((r % 8) == 0)
 973                         hl += sprintf(outaddr+hl, "    ");
 974                 hl += sprintf(outaddr+hl, "%08X ", array[r]);
 975                 if ((r % 8) == 7)
 976                         hl += sprintf(outaddr+hl, "\n");
 977         }
 978         hl += sprintf(outaddr+hl, "\n");
 979         return hl;
 980 }
 981
 982 static int zcrypt_status_read(char *resp_buff, char **start, off_t offset,
 983                               int count, int *eof, void *data)
 984 {
 985         unsigned char *workarea;
 986         int len;
 987
 988         len = 0;
 989
 990         /* resp_buff is a page. Use the right half for a work area */
 991         workarea = resp_buff + 2000;
 992         len += sprintf(resp_buff + len, "\nzcrypt version: %d.%d.%d\n",
 993                 ZCRYPT_VERSION, ZCRYPT_RELEASE, ZCRYPT_VARIANT);
 994         len += sprintf(resp_buff + len, "Cryptographic domain: %d\n",
 995                        ap_domain_index);
 996         len += sprintf(resp_buff + len, "Total device count: %d\n",
 997                        zcrypt_device_count);
 998         len += sprintf(resp_buff + len, "PCICA count: %d\n",
 999                        zcrypt_count_type(ZCRYPT_PCICA));
1000         len += sprintf(resp_buff + len, "PCICC count: %d\n",
1001                        zcrypt_count_type(ZCRYPT_PCICC));
1002         len += sprintf(resp_buff + len, "PCIXCC MCL2 count: %d\n",
1003                        zcrypt_count_type(ZCRYPT_PCIXCC_MCL2));
1004         len += sprintf(resp_buff + len, "PCIXCC MCL3 count: %d\n",
1005                        zcrypt_count_type(ZCRYPT_PCIXCC_MCL3));
1006         len += sprintf(resp_buff + len, "CEX2C count: %d\n",
1007                        zcrypt_count_type(ZCRYPT_CEX2C));
1008         len += sprintf(resp_buff + len, "CEX2A count: %d\n",
1009                        zcrypt_count_type(ZCRYPT_CEX2A));
1010         len += sprintf(resp_buff + len, "CEX3C count: %d\n",
1011                        zcrypt_count_type(ZCRYPT_CEX3C));
1012         len += sprintf(resp_buff + len, "CEX3A count: %d\n",
1013                        zcrypt_count_type(ZCRYPT_CEX3A));
1014         len += sprintf(resp_buff + len, "requestq count: %d\n",
1015                        zcrypt_requestq_count());
1016         len += sprintf(resp_buff + len, "pendingq count: %d\n",
1017                        zcrypt_pendingq_count());
1018         len += sprintf(resp_buff + len, "Total open handles: %d\n\n",
1019                        atomic_read(&zcrypt_open_count));
1020         zcrypt_status_mask(workarea);
1021         len += sprinthx("Online devices: 1=PCICA 2=PCICC 3=PCIXCC(MCL2) "
1022                         "4=PCIXCC(MCL3) 5=CEX2C 6=CEX2A 7=CEX3C 8=CEX3A",
1023                         resp_buff+len, workarea, AP_DEVICES);
1024         zcrypt_qdepth_mask(workarea);
1025         len += sprinthx("Waiting work element counts",
1026                         resp_buff+len, workarea, AP_DEVICES);
1027         zcrypt_perdev_reqcnt((int *) workarea);
1028         len += sprinthx4("Per-device successfully completed request counts",
1029                          resp_buff+len,(unsigned int *) workarea, AP_DEVICES);
1030         *eof = 1;
1031         memset((void *) workarea, 0x00, AP_DEVICES * sizeof(unsigned int));
1032         return len;
1033 }
1034
1035 static void zcrypt_disable_card(int index)
1036 {
1037         struct zcrypt_device *zdev;
1038
1039         spin_lock_bh(&zcrypt_device_lock);
1040         list_for_each_entry(zdev, &zcrypt_device_list, list)
1041                 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
1042                         zdev->online = 0;
1043                         ap_flush_queue(zdev->ap_dev);
1044                         break;
1045                 }
1046         spin_unlock_bh(&zcrypt_device_lock);
1047 }
1048
1049 static void zcrypt_enable_card(int index)
1050 {
1051         struct zcrypt_device *zdev;
1052
1053         spin_lock_bh(&zcrypt_device_lock);
1054         list_for_each_entry(zdev, &zcrypt_device_list, list)
1055                 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
1056                         zdev->online = 1;
1057                         break;
1058                 }
1059         spin_unlock_bh(&zcrypt_device_lock);
1060 }
1061
1062 static int zcrypt_status_write(struct file *file, const char __user *buffer,
1063                                unsigned long count, void *data)
1064 {
1065         unsigned char *lbuf, *ptr;
1066         unsigned long local_count;
1067         int j;
1068
1069         if (count <= 0)
1070                 return 0;
1071
1072 #define LBUFSIZE 1200UL
1073         lbuf = kmalloc(LBUFSIZE, GFP_KERNEL);
1074         if (!lbuf)
1075                 return 0;
1076
1077         local_count = min(LBUFSIZE - 1, count);
1078         if (copy_from_user(lbuf, buffer, local_count) != 0) {
1079                 kfree(lbuf);
1080                 return -EFAULT;
1081         }
1082         lbuf[local_count] = '\0';
1083
1084         ptr = strstr(lbuf, "Online devices");
1085         if (!ptr)
1086                 goto out;
1087         ptr = strstr(ptr, "\n");
1088         if (!ptr)
1089                 goto out;
1090         ptr++;
1091
1092         if (strstr(ptr, "Waiting work element counts") == NULL)
1093                 goto out;
1094
1095         for (j = 0; j < 64 && *ptr; ptr++) {
1096                 /*
1097                  * '0' for no device, '1' for PCICA, '2' for PCICC,
1098                  * '3' for PCIXCC_MCL2, '4' for PCIXCC_MCL3,
1099                  * '5' for CEX2C and '6' for CEX2A'
1100                  * '7' for CEX3C and '8' for CEX3A
1101                  */
1102                 if (*ptr >= '0' && *ptr <= '8')
1103                         j++;
1104                 else if (*ptr == 'd' || *ptr == 'D')
1105                         zcrypt_disable_card(j++);
1106                 else if (*ptr == 'e' || *ptr == 'E')
1107                         zcrypt_enable_card(j++);
1108                 else if (*ptr != ' ' && *ptr != '\t')
1109                         break;
1110         }
1111 out:
1112         kfree(lbuf);
1113         return count;
1114 }
1115
1116 static int zcrypt_rng_device_count;
1117 static u32 *zcrypt_rng_buffer;
1118 static int zcrypt_rng_buffer_index;
1119 static DEFINE_MUTEX(zcrypt_rng_mutex);
1120
1121 static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
1122 {
1123         int rc;
1124
1125         /*
1126          * We don't need locking here because the RNG API guarantees serialized
1127          * read method calls.
1128          */
1129         if (zcrypt_rng_buffer_index == 0) {
1130                 rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1131                 if (rc < 0)
1132                         return -EIO;
1133                 zcrypt_rng_buffer_index = rc / sizeof *data;
1134         }
1135         *data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index];
1136         return sizeof *data;
1137 }
1138
1139 static struct hwrng zcrypt_rng_dev = {
1140         .name           = "zcrypt",
1141         .data_read      = zcrypt_rng_data_read,
1142 };
1143
1144 static int zcrypt_rng_device_add(void)
1145 {
1146         int rc = 0;
1147
1148         mutex_lock(&zcrypt_rng_mutex);
1149         if (zcrypt_rng_device_count == 0) {
1150                 zcrypt_rng_buffer = (u32 *) get_zeroed_page(GFP_KERNEL);
1151                 if (!zcrypt_rng_buffer) {
1152                         rc = -ENOMEM;
1153                         goto out;
1154                 }
1155                 zcrypt_rng_buffer_index = 0;
1156                 rc = hwrng_register(&zcrypt_rng_dev);
1157                 if (rc)
1158                         goto out_free;
1159                 zcrypt_rng_device_count = 1;
1160         } else
1161                 zcrypt_rng_device_count++;
1162         mutex_unlock(&zcrypt_rng_mutex);
1163         return 0;
1164
1165 out_free:
1166         free_page((unsigned long) zcrypt_rng_buffer);
1167 out:
1168         mutex_unlock(&zcrypt_rng_mutex);
1169         return rc;
1170 }
1171
1172 static void zcrypt_rng_device_remove(void)
1173 {
1174         mutex_lock(&zcrypt_rng_mutex);
1175         zcrypt_rng_device_count--;
1176         if (zcrypt_rng_device_count == 0) {
1177                 hwrng_unregister(&zcrypt_rng_dev);
1178                 free_page((unsigned long) zcrypt_rng_buffer);
1179         }
1180         mutex_unlock(&zcrypt_rng_mutex);
1181 }
1182
1183 /**
1184  * zcrypt_api_init(): Module initialization.
1185  *
1186  * The module initialization code.
1187  */
1188 int __init zcrypt_api_init(void)
1189 {
1190         int rc;
1191
1192         /* Register the request sprayer. */
1193         rc = misc_register(&zcrypt_misc_device);
1194         if (rc < 0)
1195                 goto out;
1196
1197         /* Set up the proc file system */
1198         zcrypt_entry = create_proc_entry("driver/z90crypt", 0644, NULL);
1199         if (!zcrypt_entry) {
1200                 rc = -ENOMEM;
1201                 goto out_misc;
1202         }
1203         zcrypt_entry->data = NULL;
1204         zcrypt_entry->read_proc = zcrypt_status_read;
1205         zcrypt_entry->write_proc = zcrypt_status_write;
1206
1207         return 0;
1208
1209 out_misc:
1210         misc_deregister(&zcrypt_misc_device);
1211 out:
1212         return rc;
1213 }
1214
1215 /**
1216  * zcrypt_api_exit(): Module termination.
1217  *
1218  * The module termination code.
1219  */
1220 void zcrypt_api_exit(void)
1221 {
1222         remove_proc_entry("driver/z90crypt", NULL);
1223         misc_deregister(&zcrypt_misc_device);
1224 }
1225
1226 #ifndef CONFIG_ZCRYPT_MONOLITHIC
1227 module_init(zcrypt_api_init);
1228 module_exit(zcrypt_api_exit);
1229 #endif