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