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_del(&zdev->list);
 132         list_add(&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_del(&zdev->list);
 161         list_add_tail(&zdev->list, l);
 162 }
 163
 164 static void zcrypt_device_release(struct kref *kref)
 165 {
 166         struct zcrypt_device *zdev =
 167                 container_of(kref, struct zcrypt_device, refcount);
 168         zcrypt_device_free(zdev);
 169 }
 170
 171 void zcrypt_device_get(struct zcrypt_device *zdev)
 172 {
 173         kref_get(&zdev->refcount);
 174 }
 175 EXPORT_SYMBOL(zcrypt_device_get);
 176
 177 int zcrypt_device_put(struct zcrypt_device *zdev)
 178 {
 179         return kref_put(&zdev->refcount, zcrypt_device_release);
 180 }
 181 EXPORT_SYMBOL(zcrypt_device_put);
 182
 183 struct zcrypt_device *zcrypt_device_alloc(size_t max_response_size)
 184 {
 185         struct zcrypt_device *zdev;
 186
 187         zdev = kzalloc(sizeof(struct zcrypt_device), GFP_KERNEL);
 188         if (!zdev)
 189                 return NULL;
 190         zdev->reply.message = kmalloc(max_response_size, GFP_KERNEL);
 191         if (!zdev->reply.message)
 192                 goto out_free;
 193         zdev->reply.length = max_response_size;
 194         spin_lock_init(&zdev->lock);
 195         INIT_LIST_HEAD(&zdev->list);
 196         return zdev;
 197
 198 out_free:
 199         kfree(zdev);
 200         return NULL;
 201 }
 202 EXPORT_SYMBOL(zcrypt_device_alloc);
 203
 204 void zcrypt_device_free(struct zcrypt_device *zdev)
 205 {
 206         kfree(zdev->reply.message);
 207         kfree(zdev);
 208 }
 209 EXPORT_SYMBOL(zcrypt_device_free);
 210
 211 /**
 212  * zcrypt_device_register() - Register a crypto device.
 213  * @zdev: Pointer to a crypto device
 214  *
 215  * Register a crypto device. Returns 0 if successful.
 216  */
 217 int zcrypt_device_register(struct zcrypt_device *zdev)
 218 {
 219         int rc;
 220
 221         rc = sysfs_create_group(&zdev->ap_dev->device.kobj,
 222                                 &zcrypt_device_attr_group);
 223         if (rc)
 224                 goto out;
 225         get_device(&zdev->ap_dev->device);
 226         kref_init(&zdev->refcount);
 227         spin_lock_bh(&zcrypt_device_lock);
 228         zdev->online = 1;       /* New devices are online by default. */
 229         list_add_tail(&zdev->list, &zcrypt_device_list);
 230         __zcrypt_increase_preference(zdev);
 231         zcrypt_device_count++;
 232         spin_unlock_bh(&zcrypt_device_lock);
 233         if (zdev->ops->rng) {
 234                 rc = zcrypt_rng_device_add();
 235                 if (rc)
 236                         goto out_unregister;
 237         }
 238         return 0;
 239
 240 out_unregister:
 241         spin_lock_bh(&zcrypt_device_lock);
 242         zcrypt_device_count--;
 243         list_del_init(&zdev->list);
 244         spin_unlock_bh(&zcrypt_device_lock);
 245         sysfs_remove_group(&zdev->ap_dev->device.kobj,
 246                            &zcrypt_device_attr_group);
 247         put_device(&zdev->ap_dev->device);
 248         zcrypt_device_put(zdev);
 249 out:
 250         return rc;
 251 }
 252 EXPORT_SYMBOL(zcrypt_device_register);
 253
 254 /**
 255  * zcrypt_device_unregister(): Unregister a crypto device.
 256  * @zdev: Pointer to crypto device
 257  *
 258  * Unregister a crypto device.
 259  */
 260 void zcrypt_device_unregister(struct zcrypt_device *zdev)
 261 {
 262         if (zdev->ops->rng)
 263                 zcrypt_rng_device_remove();
 264         spin_lock_bh(&zcrypt_device_lock);
 265         zcrypt_device_count--;
 266         list_del_init(&zdev->list);
 267         spin_unlock_bh(&zcrypt_device_lock);
 268         sysfs_remove_group(&zdev->ap_dev->device.kobj,
 269                            &zcrypt_device_attr_group);
 270         put_device(&zdev->ap_dev->device);
 271         zcrypt_device_put(zdev);
 272 }
 273 EXPORT_SYMBOL(zcrypt_device_unregister);
 274
 275 /**
 276  * zcrypt_read (): Not supported beyond zcrypt 1.3.1.
 277  *
 278  * This function is not supported beyond zcrypt 1.3.1.
 279  */
 280 static ssize_t zcrypt_read(struct file *filp, char __user *buf,
 281                            size_t count, loff_t *f_pos)
 282 {
 283         return -EPERM;
 284 }
 285
 286 /**
 287  * zcrypt_write(): Not allowed.
 288  *
 289  * Write is is not allowed
 290  */
 291 static ssize_t zcrypt_write(struct file *filp, const char __user *buf,
 292                             size_t count, loff_t *f_pos)
 293 {
 294         return -EPERM;
 295 }
 296
 297 /**
 298  * zcrypt_open(): Count number of users.
 299  *
 300  * Device open function to count number of users.
 301  */
 302 static int zcrypt_open(struct inode *inode, struct file *filp)
 303 {
 304         lock_kernel();
 305         atomic_inc(&zcrypt_open_count);
 306         unlock_kernel();
 307         return 0;
 308 }
 309
 310 /**
 311  * zcrypt_release(): Count number of users.
 312  *
 313  * Device close function to count number of users.
 314  */
 315 static int zcrypt_release(struct inode *inode, struct file *filp)
 316 {
 317         atomic_dec(&zcrypt_open_count);
 318         return 0;
 319 }
 320
 321 /*
 322  * zcrypt ioctls.
 323  */
 324 static long zcrypt_rsa_modexpo(struct ica_rsa_modexpo *mex)
 325 {
 326         struct zcrypt_device *zdev;
 327         int rc;
 328
 329         if (mex->outputdatalength < mex->inputdatalength)
 330                 return -EINVAL;
 331         /*
 332          * As long as outputdatalength is big enough, we can set the
 333          * outputdatalength equal to the inputdatalength, since that is the
 334          * number of bytes we will copy in any case
 335          */
 336         mex->outputdatalength = mex->inputdatalength;
 337
 338         spin_lock_bh(&zcrypt_device_lock);
 339         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 340                 if (!zdev->online ||
 341                     !zdev->ops->rsa_modexpo ||
 342                     zdev->min_mod_size > mex->inputdatalength ||
 343                     zdev->max_mod_size < mex->inputdatalength)
 344                         continue;
 345                 zcrypt_device_get(zdev);
 346                 get_device(&zdev->ap_dev->device);
 347                 zdev->request_count++;
 348                 __zcrypt_decrease_preference(zdev);
 349                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 350                         spin_unlock_bh(&zcrypt_device_lock);
 351                         rc = zdev->ops->rsa_modexpo(zdev, mex);
 352                         spin_lock_bh(&zcrypt_device_lock);
 353                         module_put(zdev->ap_dev->drv->driver.owner);
 354                 }
 355                 else
 356                         rc = -EAGAIN;
 357                 zdev->request_count--;
 358                 __zcrypt_increase_preference(zdev);
 359                 put_device(&zdev->ap_dev->device);
 360                 zcrypt_device_put(zdev);
 361                 spin_unlock_bh(&zcrypt_device_lock);
 362                 return rc;
 363         }
 364         spin_unlock_bh(&zcrypt_device_lock);
 365         return -ENODEV;
 366 }
 367
 368 static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt)
 369 {
 370         struct zcrypt_device *zdev;
 371         unsigned long long z1, z2, z3;
 372         int rc, copied;
 373
 374         if (crt->outputdatalength < crt->inputdatalength ||
 375             (crt->inputdatalength & 1))
 376                 return -EINVAL;
 377         /*
 378          * As long as outputdatalength is big enough, we can set the
 379          * outputdatalength equal to the inputdatalength, since that is the
 380          * number of bytes we will copy in any case
 381          */
 382         crt->outputdatalength = crt->inputdatalength;
 383
 384         copied = 0;
 385  restart:
 386         spin_lock_bh(&zcrypt_device_lock);
 387         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 388                 if (!zdev->online ||
 389                     !zdev->ops->rsa_modexpo_crt ||
 390                     zdev->min_mod_size > crt->inputdatalength ||
 391                     zdev->max_mod_size < crt->inputdatalength)
 392                         continue;
 393                 if (zdev->short_crt && crt->inputdatalength > 240) {
 394                         /*
 395                          * Check inputdata for leading zeros for cards
 396                          * that can't handle np_prime, bp_key, or
 397                          * u_mult_inv > 128 bytes.
 398                          */
 399                         if (copied == 0) {
 400                                 int len;
 401                                 spin_unlock_bh(&zcrypt_device_lock);
 402                                 /* len is max 256 / 2 - 120 = 8 */
 403                                 len = crt->inputdatalength / 2 - 120;
 404                                 z1 = z2 = z3 = 0;
 405                                 if (copy_from_user(&z1, crt->np_prime, len) ||
 406                                     copy_from_user(&z2, crt->bp_key, len) ||
 407                                     copy_from_user(&z3, crt->u_mult_inv, len))
 408                                         return -EFAULT;
 409                                 copied = 1;
 410                                 /*
 411                                  * We have to restart device lookup -
 412                                  * the device list may have changed by now.
 413                                  */
 414                                 goto restart;
 415                         }
 416                         if (z1 != 0ULL || z2 != 0ULL || z3 != 0ULL)
 417                                 /* The device can't handle this request. */
 418                                 continue;
 419                 }
 420                 zcrypt_device_get(zdev);
 421                 get_device(&zdev->ap_dev->device);
 422                 zdev->request_count++;
 423                 __zcrypt_decrease_preference(zdev);
 424                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 425                         spin_unlock_bh(&zcrypt_device_lock);
 426                         rc = zdev->ops->rsa_modexpo_crt(zdev, crt);
 427                         spin_lock_bh(&zcrypt_device_lock);
 428                         module_put(zdev->ap_dev->drv->driver.owner);
 429                 }
 430                 else
 431                         rc = -EAGAIN;
 432                 zdev->request_count--;
 433                 __zcrypt_increase_preference(zdev);
 434                 put_device(&zdev->ap_dev->device);
 435                 zcrypt_device_put(zdev);
 436                 spin_unlock_bh(&zcrypt_device_lock);
 437                 return rc;
 438         }
 439         spin_unlock_bh(&zcrypt_device_lock);
 440         return -ENODEV;
 441 }
 442
 443 static long zcrypt_send_cprb(struct ica_xcRB *xcRB)
 444 {
 445         struct zcrypt_device *zdev;
 446         int rc;
 447
 448         spin_lock_bh(&zcrypt_device_lock);
 449         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 450                 if (!zdev->online || !zdev->ops->send_cprb ||
 451                     (xcRB->user_defined != AUTOSELECT &&
 452                         AP_QID_DEVICE(zdev->ap_dev->qid) != xcRB->user_defined)
 453                     )
 454                         continue;
 455                 zcrypt_device_get(zdev);
 456                 get_device(&zdev->ap_dev->device);
 457                 zdev->request_count++;
 458                 __zcrypt_decrease_preference(zdev);
 459                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 460                         spin_unlock_bh(&zcrypt_device_lock);
 461                         rc = zdev->ops->send_cprb(zdev, xcRB);
 462                         spin_lock_bh(&zcrypt_device_lock);
 463                         module_put(zdev->ap_dev->drv->driver.owner);
 464                 }
 465                 else
 466                         rc = -EAGAIN;
 467                 zdev->request_count--;
 468                 __zcrypt_increase_preference(zdev);
 469                 put_device(&zdev->ap_dev->device);
 470                 zcrypt_device_put(zdev);
 471                 spin_unlock_bh(&zcrypt_device_lock);
 472                 return rc;
 473         }
 474         spin_unlock_bh(&zcrypt_device_lock);
 475         return -ENODEV;
 476 }
 477
 478 static long zcrypt_rng(char *buffer)
 479 {
 480         struct zcrypt_device *zdev;
 481         int rc;
 482
 483         spin_lock_bh(&zcrypt_device_lock);
 484         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 485                 if (!zdev->online || !zdev->ops->rng)
 486                         continue;
 487                 zcrypt_device_get(zdev);
 488                 get_device(&zdev->ap_dev->device);
 489                 zdev->request_count++;
 490                 __zcrypt_decrease_preference(zdev);
 491                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 492                         spin_unlock_bh(&zcrypt_device_lock);
 493                         rc = zdev->ops->rng(zdev, buffer);
 494                         spin_lock_bh(&zcrypt_device_lock);
 495                         module_put(zdev->ap_dev->drv->driver.owner);
 496                 } else
 497                         rc = -EAGAIN;
 498                 zdev->request_count--;
 499                 __zcrypt_increase_preference(zdev);
 500                 put_device(&zdev->ap_dev->device);
 501                 zcrypt_device_put(zdev);
 502                 spin_unlock_bh(&zcrypt_device_lock);
 503                 return rc;
 504         }
 505         spin_unlock_bh(&zcrypt_device_lock);
 506         return -ENODEV;
 507 }
 508
 509 static void zcrypt_status_mask(char status[AP_DEVICES])
 510 {
 511         struct zcrypt_device *zdev;
 512
 513         memset(status, 0, sizeof(char) * AP_DEVICES);
 514         spin_lock_bh(&zcrypt_device_lock);
 515         list_for_each_entry(zdev, &zcrypt_device_list, list)
 516                 status[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 517                         zdev->online ? zdev->user_space_type : 0x0d;
 518         spin_unlock_bh(&zcrypt_device_lock);
 519 }
 520
 521 static void zcrypt_qdepth_mask(char qdepth[AP_DEVICES])
 522 {
 523         struct zcrypt_device *zdev;
 524
 525         memset(qdepth, 0, sizeof(char)  * AP_DEVICES);
 526         spin_lock_bh(&zcrypt_device_lock);
 527         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 528                 spin_lock(&zdev->ap_dev->lock);
 529                 qdepth[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 530                         zdev->ap_dev->pendingq_count +
 531                         zdev->ap_dev->requestq_count;
 532                 spin_unlock(&zdev->ap_dev->lock);
 533         }
 534         spin_unlock_bh(&zcrypt_device_lock);
 535 }
 536
 537 static void zcrypt_perdev_reqcnt(int reqcnt[AP_DEVICES])
 538 {
 539         struct zcrypt_device *zdev;
 540
 541         memset(reqcnt, 0, sizeof(int) * AP_DEVICES);
 542         spin_lock_bh(&zcrypt_device_lock);
 543         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 544                 spin_lock(&zdev->ap_dev->lock);
 545                 reqcnt[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 546                         zdev->ap_dev->total_request_count;
 547                 spin_unlock(&zdev->ap_dev->lock);
 548         }
 549         spin_unlock_bh(&zcrypt_device_lock);
 550 }
 551
 552 static int zcrypt_pendingq_count(void)
 553 {
 554         struct zcrypt_device *zdev;
 555         int pendingq_count = 0;
 556
 557         spin_lock_bh(&zcrypt_device_lock);
 558         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 559                 spin_lock(&zdev->ap_dev->lock);
 560                 pendingq_count += zdev->ap_dev->pendingq_count;
 561                 spin_unlock(&zdev->ap_dev->lock);
 562         }
 563         spin_unlock_bh(&zcrypt_device_lock);
 564         return pendingq_count;
 565 }
 566
 567 static int zcrypt_requestq_count(void)
 568 {
 569         struct zcrypt_device *zdev;
 570         int requestq_count = 0;
 571
 572         spin_lock_bh(&zcrypt_device_lock);
 573         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 574                 spin_lock(&zdev->ap_dev->lock);
 575                 requestq_count += zdev->ap_dev->requestq_count;
 576                 spin_unlock(&zdev->ap_dev->lock);
 577         }
 578         spin_unlock_bh(&zcrypt_device_lock);
 579         return requestq_count;
 580 }
 581
 582 static int zcrypt_count_type(int type)
 583 {
 584         struct zcrypt_device *zdev;
 585         int device_count = 0;
 586
 587         spin_lock_bh(&zcrypt_device_lock);
 588         list_for_each_entry(zdev, &zcrypt_device_list, list)
 589                 if (zdev->user_space_type == type)
 590                         device_count++;
 591         spin_unlock_bh(&zcrypt_device_lock);
 592         return device_count;
 593 }
 594
 595 /**
 596  * zcrypt_ica_status(): Old, depracted combi status call.
 597  *
 598  * Old, deprecated combi status call.
 599  */
 600 static long zcrypt_ica_status(struct file *filp, unsigned long arg)
 601 {
 602         struct ica_z90_status *pstat;
 603         int ret;
 604
 605         pstat = kzalloc(sizeof(*pstat), GFP_KERNEL);
 606         if (!pstat)
 607                 return -ENOMEM;
 608         pstat->totalcount = zcrypt_device_count;
 609         pstat->leedslitecount = zcrypt_count_type(ZCRYPT_PCICA);
 610         pstat->leeds2count = zcrypt_count_type(ZCRYPT_PCICC);
 611         pstat->requestqWaitCount = zcrypt_requestq_count();
 612         pstat->pendingqWaitCount = zcrypt_pendingq_count();
 613         pstat->totalOpenCount = atomic_read(&zcrypt_open_count);
 614         pstat->cryptoDomain = ap_domain_index;
 615         zcrypt_status_mask(pstat->status);
 616         zcrypt_qdepth_mask(pstat->qdepth);
 617         ret = 0;
 618         if (copy_to_user((void __user *) arg, pstat, sizeof(*pstat)))
 619                 ret = -EFAULT;
 620         kfree(pstat);
 621         return ret;
 622 }
 623
 624 static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
 625                                   unsigned long arg)
 626 {
 627         int rc;
 628
 629         switch (cmd) {
 630         case ICARSAMODEXPO: {
 631                 struct ica_rsa_modexpo __user *umex = (void __user *) arg;
 632                 struct ica_rsa_modexpo mex;
 633                 if (copy_from_user(&mex, umex, sizeof(mex)))
 634                         return -EFAULT;
 635                 do {
 636                         rc = zcrypt_rsa_modexpo(&mex);
 637                 } while (rc == -EAGAIN);
 638                 if (rc)
 639                         return rc;
 640                 return put_user(mex.outputdatalength, &umex->outputdatalength);
 641         }
 642         case ICARSACRT: {
 643                 struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg;
 644                 struct ica_rsa_modexpo_crt crt;
 645                 if (copy_from_user(&crt, ucrt, sizeof(crt)))
 646                         return -EFAULT;
 647                 do {
 648                         rc = zcrypt_rsa_crt(&crt);
 649                 } while (rc == -EAGAIN);
 650                 if (rc)
 651                         return rc;
 652                 return put_user(crt.outputdatalength, &ucrt->outputdatalength);
 653         }
 654         case ZSECSENDCPRB: {
 655                 struct ica_xcRB __user *uxcRB = (void __user *) arg;
 656                 struct ica_xcRB xcRB;
 657                 if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB)))
 658                         return -EFAULT;
 659                 do {
 660                         rc = zcrypt_send_cprb(&xcRB);
 661                 } while (rc == -EAGAIN);
 662                 if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB)))
 663                         return -EFAULT;
 664                 return rc;
 665         }
 666         case Z90STAT_STATUS_MASK: {
 667                 char status[AP_DEVICES];
 668                 zcrypt_status_mask(status);
 669                 if (copy_to_user((char __user *) arg, status,
 670                                  sizeof(char) * AP_DEVICES))
 671                         return -EFAULT;
 672                 return 0;
 673         }
 674         case Z90STAT_QDEPTH_MASK: {
 675                 char qdepth[AP_DEVICES];
 676                 zcrypt_qdepth_mask(qdepth);
 677                 if (copy_to_user((char __user *) arg, qdepth,
 678                                  sizeof(char) * AP_DEVICES))
 679                         return -EFAULT;
 680                 return 0;
 681         }
 682         case Z90STAT_PERDEV_REQCNT: {
 683                 int reqcnt[AP_DEVICES];
 684                 zcrypt_perdev_reqcnt(reqcnt);
 685                 if (copy_to_user((int __user *) arg, reqcnt,
 686                                  sizeof(int) * AP_DEVICES))
 687                         return -EFAULT;
 688                 return 0;
 689         }
 690         case Z90STAT_REQUESTQ_COUNT:
 691                 return put_user(zcrypt_requestq_count(), (int __user *) arg);
 692         case Z90STAT_PENDINGQ_COUNT:
 693                 return put_user(zcrypt_pendingq_count(), (int __user *) arg);
 694         case Z90STAT_TOTALOPEN_COUNT:
 695                 return put_user(atomic_read(&zcrypt_open_count),
 696                                 (int __user *) arg);
 697         case Z90STAT_DOMAIN_INDEX:
 698                 return put_user(ap_domain_index, (int __user *) arg);
 699         /*
 700          * Deprecated ioctls. Don't add another device count ioctl,
 701          * you can count them yourself in the user space with the
 702          * output of the Z90STAT_STATUS_MASK ioctl.
 703          */
 704         case ICAZ90STATUS:
 705                 return zcrypt_ica_status(filp, arg);
 706         case Z90STAT_TOTALCOUNT:
 707                 return put_user(zcrypt_device_count, (int __user *) arg);
 708         case Z90STAT_PCICACOUNT:
 709                 return put_user(zcrypt_count_type(ZCRYPT_PCICA),
 710                                 (int __user *) arg);
 711         case Z90STAT_PCICCCOUNT:
 712                 return put_user(zcrypt_count_type(ZCRYPT_PCICC),
 713                                 (int __user *) arg);
 714         case Z90STAT_PCIXCCMCL2COUNT:
 715                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2),
 716                                 (int __user *) arg);
 717         case Z90STAT_PCIXCCMCL3COUNT:
 718                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
 719                                 (int __user *) arg);
 720         case Z90STAT_PCIXCCCOUNT:
 721                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2) +
 722                                 zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
 723                                 (int __user *) arg);
 724         case Z90STAT_CEX2CCOUNT:
 725                 return put_user(zcrypt_count_type(ZCRYPT_CEX2C),
 726                                 (int __user *) arg);
 727         case Z90STAT_CEX2ACOUNT:
 728                 return put_user(zcrypt_count_type(ZCRYPT_CEX2A),
 729                                 (int __user *) arg);
 730         default:
 731                 /* unknown ioctl number */
 732                 return -ENOIOCTLCMD;
 733         }
 734 }
 735
 736 #ifdef CONFIG_COMPAT
 737 /*
 738  * ioctl32 conversion routines
 739  */
 740 struct compat_ica_rsa_modexpo {
 741         compat_uptr_t   inputdata;
 742         unsigned int    inputdatalength;
 743         compat_uptr_t   outputdata;
 744         unsigned int    outputdatalength;
 745         compat_uptr_t   b_key;
 746         compat_uptr_t   n_modulus;
 747 };
 748
 749 static long trans_modexpo32(struct file *filp, unsigned int cmd,
 750                             unsigned long arg)
 751 {
 752         struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg);
 753         struct compat_ica_rsa_modexpo mex32;
 754         struct ica_rsa_modexpo mex64;
 755         long rc;
 756
 757         if (copy_from_user(&mex32, umex32, sizeof(mex32)))
 758                 return -EFAULT;
 759         mex64.inputdata = compat_ptr(mex32.inputdata);
 760         mex64.inputdatalength = mex32.inputdatalength;
 761         mex64.outputdata = compat_ptr(mex32.outputdata);
 762         mex64.outputdatalength = mex32.outputdatalength;
 763         mex64.b_key = compat_ptr(mex32.b_key);
 764         mex64.n_modulus = compat_ptr(mex32.n_modulus);
 765         do {
 766                 rc = zcrypt_rsa_modexpo(&mex64);
 767         } while (rc == -EAGAIN);
 768         if (!rc)
 769                 rc = put_user(mex64.outputdatalength,
 770                               &umex32->outputdatalength);
 771         return rc;
 772 }
 773
 774 struct compat_ica_rsa_modexpo_crt {
 775         compat_uptr_t   inputdata;
 776         unsigned int    inputdatalength;
 777         compat_uptr_t   outputdata;
 778         unsigned int    outputdatalength;
 779         compat_uptr_t   bp_key;
 780         compat_uptr_t   bq_key;
 781         compat_uptr_t   np_prime;
 782         compat_uptr_t   nq_prime;
 783         compat_uptr_t   u_mult_inv;
 784 };
 785
 786 static long trans_modexpo_crt32(struct file *filp, unsigned int cmd,
 787                                 unsigned long arg)
 788 {
 789         struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg);
 790         struct compat_ica_rsa_modexpo_crt crt32;
 791         struct ica_rsa_modexpo_crt crt64;
 792         long rc;
 793
 794         if (copy_from_user(&crt32, ucrt32, sizeof(crt32)))
 795                 return -EFAULT;
 796         crt64.inputdata = compat_ptr(crt32.inputdata);
 797         crt64.inputdatalength = crt32.inputdatalength;
 798         crt64.outputdata=  compat_ptr(crt32.outputdata);
 799         crt64.outputdatalength = crt32.outputdatalength;
 800         crt64.bp_key = compat_ptr(crt32.bp_key);
 801         crt64.bq_key = compat_ptr(crt32.bq_key);
 802         crt64.np_prime = compat_ptr(crt32.np_prime);
 803         crt64.nq_prime = compat_ptr(crt32.nq_prime);
 804         crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv);
 805         do {
 806                 rc = zcrypt_rsa_crt(&crt64);
 807         } while (rc == -EAGAIN);
 808         if (!rc)
 809                 rc = put_user(crt64.outputdatalength,
 810                               &ucrt32->outputdatalength);
 811         return rc;
 812 }
 813
 814 struct compat_ica_xcRB {
 815         unsigned short  agent_ID;
 816         unsigned int    user_defined;
 817         unsigned short  request_ID;
 818         unsigned int    request_control_blk_length;
 819         unsigned char   padding1[16 - sizeof (compat_uptr_t)];
 820         compat_uptr_t   request_control_blk_addr;
 821         unsigned int    request_data_length;
 822         char            padding2[16 - sizeof (compat_uptr_t)];
 823         compat_uptr_t   request_data_address;
 824         unsigned int    reply_control_blk_length;
 825         char            padding3[16 - sizeof (compat_uptr_t)];
 826         compat_uptr_t   reply_control_blk_addr;
 827         unsigned int    reply_data_length;
 828         char            padding4[16 - sizeof (compat_uptr_t)];
 829         compat_uptr_t   reply_data_addr;
 830         unsigned short  priority_window;
 831         unsigned int    status;
 832 } __attribute__((packed));
 833
 834 static long trans_xcRB32(struct file *filp, unsigned int cmd,
 835                          unsigned long arg)
 836 {
 837         struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg);
 838         struct compat_ica_xcRB xcRB32;
 839         struct ica_xcRB xcRB64;
 840         long rc;
 841
 842         if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32)))
 843                 return -EFAULT;
 844         xcRB64.agent_ID = xcRB32.agent_ID;
 845         xcRB64.user_defined = xcRB32.user_defined;
 846         xcRB64.request_ID = xcRB32.request_ID;
 847         xcRB64.request_control_blk_length =
 848                 xcRB32.request_control_blk_length;
 849         xcRB64.request_control_blk_addr =
 850                 compat_ptr(xcRB32.request_control_blk_addr);
 851         xcRB64.request_data_length =
 852                 xcRB32.request_data_length;
 853         xcRB64.request_data_address =
 854                 compat_ptr(xcRB32.request_data_address);
 855         xcRB64.reply_control_blk_length =
 856                 xcRB32.reply_control_blk_length;
 857         xcRB64.reply_control_blk_addr =
 858                 compat_ptr(xcRB32.reply_control_blk_addr);
 859         xcRB64.reply_data_length = xcRB32.reply_data_length;
 860         xcRB64.reply_data_addr =
 861                 compat_ptr(xcRB32.reply_data_addr);
 862         xcRB64.priority_window = xcRB32.priority_window;
 863         xcRB64.status = xcRB32.status;
 864         do {
 865                 rc = zcrypt_send_cprb(&xcRB64);
 866         } while (rc == -EAGAIN);
 867         xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length;
 868         xcRB32.reply_data_length = xcRB64.reply_data_length;
 869         xcRB32.status = xcRB64.status;
 870         if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32)))
 871                         return -EFAULT;
 872         return rc;
 873 }
 874
 875 static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd,
 876                          unsigned long arg)
 877 {
 878         if (cmd == ICARSAMODEXPO)
 879                 return trans_modexpo32(filp, cmd, arg);
 880         if (cmd == ICARSACRT)
 881                 return trans_modexpo_crt32(filp, cmd, arg);
 882         if (cmd == ZSECSENDCPRB)
 883                 return trans_xcRB32(filp, cmd, arg);
 884         return zcrypt_unlocked_ioctl(filp, cmd, arg);
 885 }
 886 #endif
 887
 888 /*
 889  * Misc device file operations.
 890  */
 891 static const struct file_operations zcrypt_fops = {
 892         .owner          = THIS_MODULE,
 893         .read           = zcrypt_read,
 894         .write          = zcrypt_write,
 895         .unlocked_ioctl = zcrypt_unlocked_ioctl,
 896 #ifdef CONFIG_COMPAT
 897         .compat_ioctl   = zcrypt_compat_ioctl,
 898 #endif
 899         .open           = zcrypt_open,
 900         .release        = zcrypt_release
 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 int sprintcl(unsigned char *outaddr, unsigned char *addr,
 918                     unsigned int len)
 919 {
 920         int hl, i;
 921
 922         hl = 0;
 923         for (i = 0; i < len; i++)
 924                 hl += sprintf(outaddr+hl, "%01x", (unsigned int) addr[i]);
 925         hl += sprintf(outaddr+hl, " ");
 926         return hl;
 927 }
 928
 929 static int sprintrw(unsigned char *outaddr, unsigned char *addr,
 930                     unsigned int len)
 931 {
 932         int hl, inl, c, cx;
 933
 934         hl = sprintf(outaddr, "    ");
 935         inl = 0;
 936         for (c = 0; c < (len / 16); c++) {
 937                 hl += sprintcl(outaddr+hl, addr+inl, 16);
 938                 inl += 16;
 939         }
 940         cx = len%16;
 941         if (cx) {
 942                 hl += sprintcl(outaddr+hl, addr+inl, cx);
 943                 inl += cx;
 944         }
 945         hl += sprintf(outaddr+hl, "\n");
 946         return hl;
 947 }
 948
 949 static int sprinthx(unsigned char *title, unsigned char *outaddr,
 950                     unsigned char *addr, unsigned int len)
 951 {
 952         int hl, inl, r, rx;
 953
 954         hl = sprintf(outaddr, "\n%s\n", title);
 955         inl = 0;
 956         for (r = 0; r < (len / 64); r++) {
 957                 hl += sprintrw(outaddr+hl, addr+inl, 64);
 958                 inl += 64;
 959         }
 960         rx = len % 64;
 961         if (rx) {
 962                 hl += sprintrw(outaddr+hl, addr+inl, rx);
 963                 inl += rx;
 964         }
 965         hl += sprintf(outaddr+hl, "\n");
 966         return hl;
 967 }
 968
 969 static int sprinthx4(unsigned char *title, unsigned char *outaddr,
 970                      unsigned int *array, unsigned int len)
 971 {
 972         int hl, r;
 973
 974         hl = sprintf(outaddr, "\n%s\n", title);
 975         for (r = 0; r < len; r++) {
 976                 if ((r % 8) == 0)
 977                         hl += sprintf(outaddr+hl, "    ");
 978                 hl += sprintf(outaddr+hl, "%08X ", array[r]);
 979                 if ((r % 8) == 7)
 980                         hl += sprintf(outaddr+hl, "\n");
 981         }
 982         hl += sprintf(outaddr+hl, "\n");
 983         return hl;
 984 }
 985
 986 static int zcrypt_status_read(char *resp_buff, char **start, off_t offset,
 987                               int count, int *eof, void *data)
 988 {
 989         unsigned char *workarea;
 990         int len;
 991
 992         len = 0;
 993
 994         /* resp_buff is a page. Use the right half for a work area */
 995         workarea = resp_buff + 2000;
 996         len += sprintf(resp_buff + len, "\nzcrypt version: %d.%d.%d\n",
 997                 ZCRYPT_VERSION, ZCRYPT_RELEASE, ZCRYPT_VARIANT);
 998         len += sprintf(resp_buff + len, "Cryptographic domain: %d\n",
 999                        ap_domain_index);
1000         len += sprintf(resp_buff + len, "Total device count: %d\n",
1001                        zcrypt_device_count);
1002         len += sprintf(resp_buff + len, "PCICA count: %d\n",
1003                        zcrypt_count_type(ZCRYPT_PCICA));
1004         len += sprintf(resp_buff + len, "PCICC count: %d\n",
1005                        zcrypt_count_type(ZCRYPT_PCICC));
1006         len += sprintf(resp_buff + len, "PCIXCC MCL2 count: %d\n",
1007                        zcrypt_count_type(ZCRYPT_PCIXCC_MCL2));
1008         len += sprintf(resp_buff + len, "PCIXCC MCL3 count: %d\n",
1009                        zcrypt_count_type(ZCRYPT_PCIXCC_MCL3));
1010         len += sprintf(resp_buff + len, "CEX2C count: %d\n",
1011                        zcrypt_count_type(ZCRYPT_CEX2C));
1012         len += sprintf(resp_buff + len, "CEX2A count: %d\n",
1013                        zcrypt_count_type(ZCRYPT_CEX2A));
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",
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                 PRINTK("kmalloc failed!\n");
1076                 return 0;
1077         }
1078
1079         local_count = min(LBUFSIZE - 1, count);
1080         if (copy_from_user(lbuf, buffer, local_count) != 0) {
1081                 kfree(lbuf);
1082                 return -EFAULT;
1083         }
1084         lbuf[local_count] = '\0';
1085
1086         ptr = strstr(lbuf, "Online devices");
1087         if (!ptr) {
1088                 PRINTK("Unable to parse data (missing \"Online devices\")\n");
1089                 goto out;
1090         }
1091         ptr = strstr(ptr, "\n");
1092         if (!ptr) {
1093                 PRINTK("Unable to parse data (missing newline "
1094                        "after \"Online devices\")\n");
1095                 goto out;
1096         }
1097         ptr++;
1098
1099         if (strstr(ptr, "Waiting work element counts") == NULL) {
1100                 PRINTK("Unable to parse data (missing "
1101                        "\"Waiting work element counts\")\n");
1102                 goto out;
1103         }
1104
1105         for (j = 0; j < 64 && *ptr; ptr++) {
1106                 /*
1107                  * '0' for no device, '1' for PCICA, '2' for PCICC,
1108                  * '3' for PCIXCC_MCL2, '4' for PCIXCC_MCL3,
1109                  * '5' for CEX2C and '6' for CEX2A'
1110                  */
1111                 if (*ptr >= '0' && *ptr <= '6')
1112                         j++;
1113                 else if (*ptr == 'd' || *ptr == 'D')
1114                         zcrypt_disable_card(j++);
1115                 else if (*ptr == 'e' || *ptr == 'E')
1116                         zcrypt_enable_card(j++);
1117                 else if (*ptr != ' ' && *ptr != '\t')
1118                         break;
1119         }
1120 out:
1121         kfree(lbuf);
1122         return count;
1123 }
1124
1125 static int zcrypt_rng_device_count;
1126 static u32 *zcrypt_rng_buffer;
1127 static int zcrypt_rng_buffer_index;
1128 static DEFINE_MUTEX(zcrypt_rng_mutex);
1129
1130 static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
1131 {
1132         int rc;
1133
1134         /*
1135          * We don't need locking here because the RNG API guarantees serialized
1136          * read method calls.
1137          */
1138         if (zcrypt_rng_buffer_index == 0) {
1139                 rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1140                 if (rc < 0)
1141                         return -EIO;
1142                 zcrypt_rng_buffer_index = rc / sizeof *data;
1143         }
1144         *data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index];
1145         return sizeof *data;
1146 }
1147
1148 static struct hwrng zcrypt_rng_dev = {
1149         .name           = "zcrypt",
1150         .data_read      = zcrypt_rng_data_read,
1151 };
1152
1153 static int zcrypt_rng_device_add(void)
1154 {
1155         int rc = 0;
1156
1157         mutex_lock(&zcrypt_rng_mutex);
1158         if (zcrypt_rng_device_count == 0) {
1159                 zcrypt_rng_buffer = (u32 *) get_zeroed_page(GFP_KERNEL);
1160                 if (!zcrypt_rng_buffer) {
1161                         rc = -ENOMEM;
1162                         goto out;
1163                 }
1164                 zcrypt_rng_buffer_index = 0;
1165                 rc = hwrng_register(&zcrypt_rng_dev);
1166                 if (rc)
1167                         goto out_free;
1168                 zcrypt_rng_device_count = 1;
1169         } else
1170                 zcrypt_rng_device_count++;
1171         mutex_unlock(&zcrypt_rng_mutex);
1172         return 0;
1173
1174 out_free:
1175         free_page((unsigned long) zcrypt_rng_buffer);
1176 out:
1177         mutex_unlock(&zcrypt_rng_mutex);
1178         return rc;
1179 }
1180
1181 static void zcrypt_rng_device_remove(void)
1182 {
1183         mutex_lock(&zcrypt_rng_mutex);
1184         zcrypt_rng_device_count--;
1185         if (zcrypt_rng_device_count == 0) {
1186                 hwrng_unregister(&zcrypt_rng_dev);
1187                 free_page((unsigned long) zcrypt_rng_buffer);
1188         }
1189         mutex_unlock(&zcrypt_rng_mutex);
1190 }
1191
1192 /**
1193  * zcrypt_api_init(): Module initialization.
1194  *
1195  * The module initialization code.
1196  */
1197 int __init zcrypt_api_init(void)
1198 {
1199         int rc;
1200
1201         /* Register the request sprayer. */
1202         rc = misc_register(&zcrypt_misc_device);
1203         if (rc < 0) {
1204                 PRINTKW(KERN_ERR "misc_register (minor %d) failed with %d\n",
1205                         zcrypt_misc_device.minor, rc);
1206                 goto out;
1207         }
1208
1209         /* Set up the proc file system */
1210         zcrypt_entry = create_proc_entry("driver/z90crypt", 0644, NULL);
1211         if (!zcrypt_entry) {
1212                 PRINTK("Couldn't create z90crypt proc entry\n");
1213                 rc = -ENOMEM;
1214                 goto out_misc;
1215         }
1216         zcrypt_entry->data = NULL;
1217         zcrypt_entry->read_proc = zcrypt_status_read;
1218         zcrypt_entry->write_proc = zcrypt_status_write;
1219
1220         return 0;
1221
1222 out_misc:
1223         misc_deregister(&zcrypt_misc_device);
1224 out:
1225         return rc;
1226 }
1227
1228 /**
1229  * zcrypt_api_exit(): Module termination.
1230  *
1231  * The module termination code.
1232  */
1233 void zcrypt_api_exit(void)
1234 {
1235         remove_proc_entry("driver/z90crypt", NULL);
1236         misc_deregister(&zcrypt_misc_device);
1237 }
1238
1239 #ifndef CONFIG_ZCRYPT_MONOLITHIC
1240 module_init(zcrypt_api_init);
1241 module_exit(zcrypt_api_exit);
1242 #endif