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