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 <asm/atomic.h>
  38 #include <asm/uaccess.h>
  39 #include <linux/hw_random.h>
  40
  41 #include "zcrypt_api.h"
  42
  43 /*
  44  * Module description.
  45  */
  46 MODULE_AUTHOR("IBM Corporation");
  47 MODULE_DESCRIPTION("Cryptographic Coprocessor interface, "
  48                    "Copyright 2001, 2006 IBM Corporation");
  49 MODULE_LICENSE("GPL");
  50
  51 static DEFINE_SPINLOCK(zcrypt_device_lock);
  52 static LIST_HEAD(zcrypt_device_list);
  53 static int zcrypt_device_count = 0;
  54 static atomic_t zcrypt_open_count = ATOMIC_INIT(0);
  55
  56 static int zcrypt_rng_device_add(void);
  57 static void zcrypt_rng_device_remove(void);
  58
  59 /*
  60  * Device attributes common for all crypto devices.
  61  */
  62 static ssize_t zcrypt_type_show(struct device *dev,
  63                                 struct device_attribute *attr, char *buf)
  64 {
  65         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
  66         return snprintf(buf, PAGE_SIZE, "%s\n", zdev->type_string);
  67 }
  68
  69 static DEVICE_ATTR(type, 0444, zcrypt_type_show, NULL);
  70
  71 static ssize_t zcrypt_online_show(struct device *dev,
  72                                   struct device_attribute *attr, char *buf)
  73 {
  74         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
  75         return snprintf(buf, PAGE_SIZE, "%d\n", zdev->online);
  76 }
  77
  78 static ssize_t zcrypt_online_store(struct device *dev,
  79                                    struct device_attribute *attr,
  80                                    const char *buf, size_t count)
  81 {
  82         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
  83         int online;
  84
  85         if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
  86                 return -EINVAL;
  87         zdev->online = online;
  88         if (!online)
  89                 ap_flush_queue(zdev->ap_dev);
  90         return count;
  91 }
  92
  93 static DEVICE_ATTR(online, 0644, zcrypt_online_show, zcrypt_online_store);
  94
  95 static struct attribute * zcrypt_device_attrs[] = {
  96         &dev_attr_type.attr,
  97         &dev_attr_online.attr,
  98         NULL,
  99 };
 100
 101 static struct attribute_group zcrypt_device_attr_group = {
 102         .attrs = zcrypt_device_attrs,
 103 };
 104
 105 /**
 106  * __zcrypt_increase_preference(): Increase preference of a crypto device.
 107  * @zdev: Pointer the crypto device
 108  *
 109  * Move the device towards the head of the device list.
 110  * Need to be called while holding the zcrypt device list lock.
 111  * Note: cards with speed_rating of 0 are kept at the end of the list.
 112  */
 113 static void __zcrypt_increase_preference(struct zcrypt_device *zdev)
 114 {
 115         struct zcrypt_device *tmp;
 116         struct list_head *l;
 117
 118         if (zdev->speed_rating == 0)
 119                 return;
 120         for (l = zdev->list.prev; l != &zcrypt_device_list; l = l->prev) {
 121                 tmp = list_entry(l, struct zcrypt_device, list);
 122                 if ((tmp->request_count + 1) * tmp->speed_rating <=
 123                     (zdev->request_count + 1) * zdev->speed_rating &&
 124                     tmp->speed_rating != 0)
 125                         break;
 126         }
 127         if (l == zdev->list.prev)
 128                 return;
 129         /* Move zdev behind l */
 130         list_del(&zdev->list);
 131         list_add(&zdev->list, l);
 132 }
 133
 134 /**
 135  * __zcrypt_decrease_preference(): Decrease preference of a crypto device.
 136  * @zdev: Pointer to a crypto device.
 137  *
 138  * Move the device towards the tail of the device list.
 139  * Need to be called while holding the zcrypt device list lock.
 140  * Note: cards with speed_rating of 0 are kept at the end of the list.
 141  */
 142 static void __zcrypt_decrease_preference(struct zcrypt_device *zdev)
 143 {
 144         struct zcrypt_device *tmp;
 145         struct list_head *l;
 146
 147         if (zdev->speed_rating == 0)
 148                 return;
 149         for (l = zdev->list.next; l != &zcrypt_device_list; l = l->next) {
 150                 tmp = list_entry(l, struct zcrypt_device, list);
 151                 if ((tmp->request_count + 1) * tmp->speed_rating >
 152                     (zdev->request_count + 1) * zdev->speed_rating ||
 153                     tmp->speed_rating == 0)
 154                         break;
 155         }
 156         if (l == zdev->list.next)
 157                 return;
 158         /* Move zdev before l */
 159         list_del(&zdev->list);
 160         list_add_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 0;
 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                                 int len;
 398                                 spin_unlock_bh(&zcrypt_device_lock);
 399                                 /* len is max 256 / 2 - 120 = 8 */
 400                                 len = crt->inputdatalength / 2 - 120;
 401                                 z1 = z2 = z3 = 0;
 402                                 if (copy_from_user(&z1, crt->np_prime, len) ||
 403                                     copy_from_user(&z2, crt->bp_key, len) ||
 404                                     copy_from_user(&z3, crt->u_mult_inv, len))
 405                                         return -EFAULT;
 406                                 copied = 1;
 407                                 /*
 408                                  * We have to restart device lookup -
 409                                  * the device list may have changed by now.
 410                                  */
 411                                 goto restart;
 412                         }
 413                         if (z1 != 0ULL || z2 != 0ULL || z3 != 0ULL)
 414                                 /* The device can't handle this request. */
 415                                 continue;
 416                 }
 417                 zcrypt_device_get(zdev);
 418                 get_device(&zdev->ap_dev->device);
 419                 zdev->request_count++;
 420                 __zcrypt_decrease_preference(zdev);
 421                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 422                         spin_unlock_bh(&zcrypt_device_lock);
 423                         rc = zdev->ops->rsa_modexpo_crt(zdev, crt);
 424                         spin_lock_bh(&zcrypt_device_lock);
 425                         module_put(zdev->ap_dev->drv->driver.owner);
 426                 }
 427                 else
 428                         rc = -EAGAIN;
 429                 zdev->request_count--;
 430                 __zcrypt_increase_preference(zdev);
 431                 put_device(&zdev->ap_dev->device);
 432                 zcrypt_device_put(zdev);
 433                 spin_unlock_bh(&zcrypt_device_lock);
 434                 return rc;
 435         }
 436         spin_unlock_bh(&zcrypt_device_lock);
 437         return -ENODEV;
 438 }
 439
 440 static long zcrypt_send_cprb(struct ica_xcRB *xcRB)
 441 {
 442         struct zcrypt_device *zdev;
 443         int rc;
 444
 445         spin_lock_bh(&zcrypt_device_lock);
 446         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 447                 if (!zdev->online || !zdev->ops->send_cprb ||
 448                     (xcRB->user_defined != AUTOSELECT &&
 449                         AP_QID_DEVICE(zdev->ap_dev->qid) != xcRB->user_defined)
 450                     )
 451                         continue;
 452                 zcrypt_device_get(zdev);
 453                 get_device(&zdev->ap_dev->device);
 454                 zdev->request_count++;
 455                 __zcrypt_decrease_preference(zdev);
 456                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 457                         spin_unlock_bh(&zcrypt_device_lock);
 458                         rc = zdev->ops->send_cprb(zdev, xcRB);
 459                         spin_lock_bh(&zcrypt_device_lock);
 460                         module_put(zdev->ap_dev->drv->driver.owner);
 461                 }
 462                 else
 463                         rc = -EAGAIN;
 464                 zdev->request_count--;
 465                 __zcrypt_increase_preference(zdev);
 466                 put_device(&zdev->ap_dev->device);
 467                 zcrypt_device_put(zdev);
 468                 spin_unlock_bh(&zcrypt_device_lock);
 469                 return rc;
 470         }
 471         spin_unlock_bh(&zcrypt_device_lock);
 472         return -ENODEV;
 473 }
 474
 475 static long zcrypt_rng(char *buffer)
 476 {
 477         struct zcrypt_device *zdev;
 478         int rc;
 479
 480         spin_lock_bh(&zcrypt_device_lock);
 481         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 482                 if (!zdev->online || !zdev->ops->rng)
 483                         continue;
 484                 zcrypt_device_get(zdev);
 485                 get_device(&zdev->ap_dev->device);
 486                 zdev->request_count++;
 487                 __zcrypt_decrease_preference(zdev);
 488                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 489                         spin_unlock_bh(&zcrypt_device_lock);
 490                         rc = zdev->ops->rng(zdev, buffer);
 491                         spin_lock_bh(&zcrypt_device_lock);
 492                         module_put(zdev->ap_dev->drv->driver.owner);
 493                 } else
 494                         rc = -EAGAIN;
 495                 zdev->request_count--;
 496                 __zcrypt_increase_preference(zdev);
 497                 put_device(&zdev->ap_dev->device);
 498                 zcrypt_device_put(zdev);
 499                 spin_unlock_bh(&zcrypt_device_lock);
 500                 return rc;
 501         }
 502         spin_unlock_bh(&zcrypt_device_lock);
 503         return -ENODEV;
 504 }
 505
 506 static void zcrypt_status_mask(char status[AP_DEVICES])
 507 {
 508         struct zcrypt_device *zdev;
 509
 510         memset(status, 0, sizeof(char) * AP_DEVICES);
 511         spin_lock_bh(&zcrypt_device_lock);
 512         list_for_each_entry(zdev, &zcrypt_device_list, list)
 513                 status[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 514                         zdev->online ? zdev->user_space_type : 0x0d;
 515         spin_unlock_bh(&zcrypt_device_lock);
 516 }
 517
 518 static void zcrypt_qdepth_mask(char qdepth[AP_DEVICES])
 519 {
 520         struct zcrypt_device *zdev;
 521
 522         memset(qdepth, 0, sizeof(char)  * AP_DEVICES);
 523         spin_lock_bh(&zcrypt_device_lock);
 524         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 525                 spin_lock(&zdev->ap_dev->lock);
 526                 qdepth[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 527                         zdev->ap_dev->pendingq_count +
 528                         zdev->ap_dev->requestq_count;
 529                 spin_unlock(&zdev->ap_dev->lock);
 530         }
 531         spin_unlock_bh(&zcrypt_device_lock);
 532 }
 533
 534 static void zcrypt_perdev_reqcnt(int reqcnt[AP_DEVICES])
 535 {
 536         struct zcrypt_device *zdev;
 537
 538         memset(reqcnt, 0, sizeof(int) * AP_DEVICES);
 539         spin_lock_bh(&zcrypt_device_lock);
 540         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 541                 spin_lock(&zdev->ap_dev->lock);
 542                 reqcnt[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 543                         zdev->ap_dev->total_request_count;
 544                 spin_unlock(&zdev->ap_dev->lock);
 545         }
 546         spin_unlock_bh(&zcrypt_device_lock);
 547 }
 548
 549 static int zcrypt_pendingq_count(void)
 550 {
 551         struct zcrypt_device *zdev;
 552         int pendingq_count = 0;
 553
 554         spin_lock_bh(&zcrypt_device_lock);
 555         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 556                 spin_lock(&zdev->ap_dev->lock);
 557                 pendingq_count += zdev->ap_dev->pendingq_count;
 558                 spin_unlock(&zdev->ap_dev->lock);
 559         }
 560         spin_unlock_bh(&zcrypt_device_lock);
 561         return pendingq_count;
 562 }
 563
 564 static int zcrypt_requestq_count(void)
 565 {
 566         struct zcrypt_device *zdev;
 567         int requestq_count = 0;
 568
 569         spin_lock_bh(&zcrypt_device_lock);
 570         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 571                 spin_lock(&zdev->ap_dev->lock);
 572                 requestq_count += zdev->ap_dev->requestq_count;
 573                 spin_unlock(&zdev->ap_dev->lock);
 574         }
 575         spin_unlock_bh(&zcrypt_device_lock);
 576         return requestq_count;
 577 }
 578
 579 static int zcrypt_count_type(int type)
 580 {
 581         struct zcrypt_device *zdev;
 582         int device_count = 0;
 583
 584         spin_lock_bh(&zcrypt_device_lock);
 585         list_for_each_entry(zdev, &zcrypt_device_list, list)
 586                 if (zdev->user_space_type == type)
 587                         device_count++;
 588         spin_unlock_bh(&zcrypt_device_lock);
 589         return device_count;
 590 }
 591
 592 /**
 593  * zcrypt_ica_status(): Old, depracted combi status call.
 594  *
 595  * Old, deprecated combi status call.
 596  */
 597 static long zcrypt_ica_status(struct file *filp, unsigned long arg)
 598 {
 599         struct ica_z90_status *pstat;
 600         int ret;
 601
 602         pstat = kzalloc(sizeof(*pstat), GFP_KERNEL);
 603         if (!pstat)
 604                 return -ENOMEM;
 605         pstat->totalcount = zcrypt_device_count;
 606         pstat->leedslitecount = zcrypt_count_type(ZCRYPT_PCICA);
 607         pstat->leeds2count = zcrypt_count_type(ZCRYPT_PCICC);
 608         pstat->requestqWaitCount = zcrypt_requestq_count();
 609         pstat->pendingqWaitCount = zcrypt_pendingq_count();
 610         pstat->totalOpenCount = atomic_read(&zcrypt_open_count);
 611         pstat->cryptoDomain = ap_domain_index;
 612         zcrypt_status_mask(pstat->status);
 613         zcrypt_qdepth_mask(pstat->qdepth);
 614         ret = 0;
 615         if (copy_to_user((void __user *) arg, pstat, sizeof(*pstat)))
 616                 ret = -EFAULT;
 617         kfree(pstat);
 618         return ret;
 619 }
 620
 621 static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
 622                                   unsigned long arg)
 623 {
 624         int rc;
 625
 626         switch (cmd) {
 627         case ICARSAMODEXPO: {
 628                 struct ica_rsa_modexpo __user *umex = (void __user *) arg;
 629                 struct ica_rsa_modexpo mex;
 630                 if (copy_from_user(&mex, umex, sizeof(mex)))
 631                         return -EFAULT;
 632                 do {
 633                         rc = zcrypt_rsa_modexpo(&mex);
 634                 } while (rc == -EAGAIN);
 635                 if (rc)
 636                         return rc;
 637                 return put_user(mex.outputdatalength, &umex->outputdatalength);
 638         }
 639         case ICARSACRT: {
 640                 struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg;
 641                 struct ica_rsa_modexpo_crt crt;
 642                 if (copy_from_user(&crt, ucrt, sizeof(crt)))
 643                         return -EFAULT;
 644                 do {
 645                         rc = zcrypt_rsa_crt(&crt);
 646                 } while (rc == -EAGAIN);
 647                 if (rc)
 648                         return rc;
 649                 return put_user(crt.outputdatalength, &ucrt->outputdatalength);
 650         }
 651         case ZSECSENDCPRB: {
 652                 struct ica_xcRB __user *uxcRB = (void __user *) arg;
 653                 struct ica_xcRB xcRB;
 654                 if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB)))
 655                         return -EFAULT;
 656                 do {
 657                         rc = zcrypt_send_cprb(&xcRB);
 658                 } while (rc == -EAGAIN);
 659                 if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB)))
 660                         return -EFAULT;
 661                 return rc;
 662         }
 663         case Z90STAT_STATUS_MASK: {
 664                 char status[AP_DEVICES];
 665                 zcrypt_status_mask(status);
 666                 if (copy_to_user((char __user *) arg, status,
 667                                  sizeof(char) * AP_DEVICES))
 668                         return -EFAULT;
 669                 return 0;
 670         }
 671         case Z90STAT_QDEPTH_MASK: {
 672                 char qdepth[AP_DEVICES];
 673                 zcrypt_qdepth_mask(qdepth);
 674                 if (copy_to_user((char __user *) arg, qdepth,
 675                                  sizeof(char) * AP_DEVICES))
 676                         return -EFAULT;
 677                 return 0;
 678         }
 679         case Z90STAT_PERDEV_REQCNT: {
 680                 int reqcnt[AP_DEVICES];
 681                 zcrypt_perdev_reqcnt(reqcnt);
 682                 if (copy_to_user((int __user *) arg, reqcnt,
 683                                  sizeof(int) * AP_DEVICES))
 684                         return -EFAULT;
 685                 return 0;
 686         }
 687         case Z90STAT_REQUESTQ_COUNT:
 688                 return put_user(zcrypt_requestq_count(), (int __user *) arg);
 689         case Z90STAT_PENDINGQ_COUNT:
 690                 return put_user(zcrypt_pendingq_count(), (int __user *) arg);
 691         case Z90STAT_TOTALOPEN_COUNT:
 692                 return put_user(atomic_read(&zcrypt_open_count),
 693                                 (int __user *) arg);
 694         case Z90STAT_DOMAIN_INDEX:
 695                 return put_user(ap_domain_index, (int __user *) arg);
 696         /*
 697          * Deprecated ioctls. Don't add another device count ioctl,
 698          * you can count them yourself in the user space with the
 699          * output of the Z90STAT_STATUS_MASK ioctl.
 700          */
 701         case ICAZ90STATUS:
 702                 return zcrypt_ica_status(filp, arg);
 703         case Z90STAT_TOTALCOUNT:
 704                 return put_user(zcrypt_device_count, (int __user *) arg);
 705         case Z90STAT_PCICACOUNT:
 706                 return put_user(zcrypt_count_type(ZCRYPT_PCICA),
 707                                 (int __user *) arg);
 708         case Z90STAT_PCICCCOUNT:
 709                 return put_user(zcrypt_count_type(ZCRYPT_PCICC),
 710                                 (int __user *) arg);
 711         case Z90STAT_PCIXCCMCL2COUNT:
 712                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2),
 713                                 (int __user *) arg);
 714         case Z90STAT_PCIXCCMCL3COUNT:
 715                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
 716                                 (int __user *) arg);
 717         case Z90STAT_PCIXCCCOUNT:
 718                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2) +
 719                                 zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
 720                                 (int __user *) arg);
 721         case Z90STAT_CEX2CCOUNT:
 722                 return put_user(zcrypt_count_type(ZCRYPT_CEX2C),
 723                                 (int __user *) arg);
 724         case Z90STAT_CEX2ACOUNT:
 725                 return put_user(zcrypt_count_type(ZCRYPT_CEX2A),
 726                                 (int __user *) arg);
 727         default:
 728                 /* unknown ioctl number */
 729                 return -ENOIOCTLCMD;
 730         }
 731 }
 732
 733 #ifdef CONFIG_COMPAT
 734 /*
 735  * ioctl32 conversion routines
 736  */
 737 struct compat_ica_rsa_modexpo {
 738         compat_uptr_t   inputdata;
 739         unsigned int    inputdatalength;
 740         compat_uptr_t   outputdata;
 741         unsigned int    outputdatalength;
 742         compat_uptr_t   b_key;
 743         compat_uptr_t   n_modulus;
 744 };
 745
 746 static long trans_modexpo32(struct file *filp, unsigned int cmd,
 747                             unsigned long arg)
 748 {
 749         struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg);
 750         struct compat_ica_rsa_modexpo mex32;
 751         struct ica_rsa_modexpo mex64;
 752         long rc;
 753
 754         if (copy_from_user(&mex32, umex32, sizeof(mex32)))
 755                 return -EFAULT;
 756         mex64.inputdata = compat_ptr(mex32.inputdata);
 757         mex64.inputdatalength = mex32.inputdatalength;
 758         mex64.outputdata = compat_ptr(mex32.outputdata);
 759         mex64.outputdatalength = mex32.outputdatalength;
 760         mex64.b_key = compat_ptr(mex32.b_key);
 761         mex64.n_modulus = compat_ptr(mex32.n_modulus);
 762         do {
 763                 rc = zcrypt_rsa_modexpo(&mex64);
 764         } while (rc == -EAGAIN);
 765         if (!rc)
 766                 rc = put_user(mex64.outputdatalength,
 767                               &umex32->outputdatalength);
 768         return rc;
 769 }
 770
 771 struct compat_ica_rsa_modexpo_crt {
 772         compat_uptr_t   inputdata;
 773         unsigned int    inputdatalength;
 774         compat_uptr_t   outputdata;
 775         unsigned int    outputdatalength;
 776         compat_uptr_t   bp_key;
 777         compat_uptr_t   bq_key;
 778         compat_uptr_t   np_prime;
 779         compat_uptr_t   nq_prime;
 780         compat_uptr_t   u_mult_inv;
 781 };
 782
 783 static long trans_modexpo_crt32(struct file *filp, unsigned int cmd,
 784                                 unsigned long arg)
 785 {
 786         struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg);
 787         struct compat_ica_rsa_modexpo_crt crt32;
 788         struct ica_rsa_modexpo_crt crt64;
 789         long rc;
 790
 791         if (copy_from_user(&crt32, ucrt32, sizeof(crt32)))
 792                 return -EFAULT;
 793         crt64.inputdata = compat_ptr(crt32.inputdata);
 794         crt64.inputdatalength = crt32.inputdatalength;
 795         crt64.outputdata=  compat_ptr(crt32.outputdata);
 796         crt64.outputdatalength = crt32.outputdatalength;
 797         crt64.bp_key = compat_ptr(crt32.bp_key);
 798         crt64.bq_key = compat_ptr(crt32.bq_key);
 799         crt64.np_prime = compat_ptr(crt32.np_prime);
 800         crt64.nq_prime = compat_ptr(crt32.nq_prime);
 801         crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv);
 802         do {
 803                 rc = zcrypt_rsa_crt(&crt64);
 804         } while (rc == -EAGAIN);
 805         if (!rc)
 806                 rc = put_user(crt64.outputdatalength,
 807                               &ucrt32->outputdatalength);
 808         return rc;
 809 }
 810
 811 struct compat_ica_xcRB {
 812         unsigned short  agent_ID;
 813         unsigned int    user_defined;
 814         unsigned short  request_ID;
 815         unsigned int    request_control_blk_length;
 816         unsigned char   padding1[16 - sizeof (compat_uptr_t)];
 817         compat_uptr_t   request_control_blk_addr;
 818         unsigned int    request_data_length;
 819         char            padding2[16 - sizeof (compat_uptr_t)];
 820         compat_uptr_t   request_data_address;
 821         unsigned int    reply_control_blk_length;
 822         char            padding3[16 - sizeof (compat_uptr_t)];
 823         compat_uptr_t   reply_control_blk_addr;
 824         unsigned int    reply_data_length;
 825         char            padding4[16 - sizeof (compat_uptr_t)];
 826         compat_uptr_t   reply_data_addr;
 827         unsigned short  priority_window;
 828         unsigned int    status;
 829 } __attribute__((packed));
 830
 831 static long trans_xcRB32(struct file *filp, unsigned int cmd,
 832                          unsigned long arg)
 833 {
 834         struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg);
 835         struct compat_ica_xcRB xcRB32;
 836         struct ica_xcRB xcRB64;
 837         long rc;
 838
 839         if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32)))
 840                 return -EFAULT;
 841         xcRB64.agent_ID = xcRB32.agent_ID;
 842         xcRB64.user_defined = xcRB32.user_defined;
 843         xcRB64.request_ID = xcRB32.request_ID;
 844         xcRB64.request_control_blk_length =
 845                 xcRB32.request_control_blk_length;
 846         xcRB64.request_control_blk_addr =
 847                 compat_ptr(xcRB32.request_control_blk_addr);
 848         xcRB64.request_data_length =
 849                 xcRB32.request_data_length;
 850         xcRB64.request_data_address =
 851                 compat_ptr(xcRB32.request_data_address);
 852         xcRB64.reply_control_blk_length =
 853                 xcRB32.reply_control_blk_length;
 854         xcRB64.reply_control_blk_addr =
 855                 compat_ptr(xcRB32.reply_control_blk_addr);
 856         xcRB64.reply_data_length = xcRB32.reply_data_length;
 857         xcRB64.reply_data_addr =
 858                 compat_ptr(xcRB32.reply_data_addr);
 859         xcRB64.priority_window = xcRB32.priority_window;
 860         xcRB64.status = xcRB32.status;
 861         do {
 862                 rc = zcrypt_send_cprb(&xcRB64);
 863         } while (rc == -EAGAIN);
 864         xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length;
 865         xcRB32.reply_data_length = xcRB64.reply_data_length;
 866         xcRB32.status = xcRB64.status;
 867         if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32)))
 868                         return -EFAULT;
 869         return rc;
 870 }
 871
 872 static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd,
 873                          unsigned long arg)
 874 {
 875         if (cmd == ICARSAMODEXPO)
 876                 return trans_modexpo32(filp, cmd, arg);
 877         if (cmd == ICARSACRT)
 878                 return trans_modexpo_crt32(filp, cmd, arg);
 879         if (cmd == ZSECSENDCPRB)
 880                 return trans_xcRB32(filp, cmd, arg);
 881         return zcrypt_unlocked_ioctl(filp, cmd, arg);
 882 }
 883 #endif
 884
 885 /*
 886  * Misc device file operations.
 887  */
 888 static const struct file_operations zcrypt_fops = {
 889         .owner          = THIS_MODULE,
 890         .read           = zcrypt_read,
 891         .write          = zcrypt_write,
 892         .unlocked_ioctl = zcrypt_unlocked_ioctl,
 893 #ifdef CONFIG_COMPAT
 894         .compat_ioctl   = zcrypt_compat_ioctl,
 895 #endif
 896         .open           = zcrypt_open,
 897         .release        = zcrypt_release
 898 };
 899
 900 /*
 901  * Misc device.
 902  */
 903 static struct miscdevice zcrypt_misc_device = {
 904         .minor      = MISC_DYNAMIC_MINOR,
 905         .name       = "z90crypt",
 906         .fops       = &zcrypt_fops,
 907 };
 908
 909 /*
 910  * Deprecated /proc entry support.
 911  */
 912 static struct proc_dir_entry *zcrypt_entry;
 913
 914 static int sprintcl(unsigned char *outaddr, unsigned char *addr,
 915                     unsigned int len)
 916 {
 917         int hl, i;
 918
 919         hl = 0;
 920         for (i = 0; i < len; i++)
 921                 hl += sprintf(outaddr+hl, "%01x", (unsigned int) addr[i]);
 922         hl += sprintf(outaddr+hl, " ");
 923         return hl;
 924 }
 925
 926 static int sprintrw(unsigned char *outaddr, unsigned char *addr,
 927                     unsigned int len)
 928 {
 929         int hl, inl, c, cx;
 930
 931         hl = sprintf(outaddr, "    ");
 932         inl = 0;
 933         for (c = 0; c < (len / 16); c++) {
 934                 hl += sprintcl(outaddr+hl, addr+inl, 16);
 935                 inl += 16;
 936         }
 937         cx = len%16;
 938         if (cx) {
 939                 hl += sprintcl(outaddr+hl, addr+inl, cx);
 940                 inl += cx;
 941         }
 942         hl += sprintf(outaddr+hl, "\n");
 943         return hl;
 944 }
 945
 946 static int sprinthx(unsigned char *title, unsigned char *outaddr,
 947                     unsigned char *addr, unsigned int len)
 948 {
 949         int hl, inl, r, rx;
 950
 951         hl = sprintf(outaddr, "\n%s\n", title);
 952         inl = 0;
 953         for (r = 0; r < (len / 64); r++) {
 954                 hl += sprintrw(outaddr+hl, addr+inl, 64);
 955                 inl += 64;
 956         }
 957         rx = len % 64;
 958         if (rx) {
 959                 hl += sprintrw(outaddr+hl, addr+inl, rx);
 960                 inl += rx;
 961         }
 962         hl += sprintf(outaddr+hl, "\n");
 963         return hl;
 964 }
 965
 966 static int sprinthx4(unsigned char *title, unsigned char *outaddr,
 967                      unsigned int *array, unsigned int len)
 968 {
 969         int hl, r;
 970
 971         hl = sprintf(outaddr, "\n%s\n", title);
 972         for (r = 0; r < len; r++) {
 973                 if ((r % 8) == 0)
 974                         hl += sprintf(outaddr+hl, "    ");
 975                 hl += sprintf(outaddr+hl, "%08X ", array[r]);
 976                 if ((r % 8) == 7)
 977                         hl += sprintf(outaddr+hl, "\n");
 978         }
 979         hl += sprintf(outaddr+hl, "\n");
 980         return hl;
 981 }
 982
 983 static int zcrypt_status_read(char *resp_buff, char **start, off_t offset,
 984                               int count, int *eof, void *data)
 985 {
 986         unsigned char *workarea;
 987         int len;
 988
 989         len = 0;
 990
 991         /* resp_buff is a page. Use the right half for a work area */
 992         workarea = resp_buff + 2000;
 993         len += sprintf(resp_buff + len, "\nzcrypt version: %d.%d.%d\n",
 994                 ZCRYPT_VERSION, ZCRYPT_RELEASE, ZCRYPT_VARIANT);
 995         len += sprintf(resp_buff + len, "Cryptographic domain: %d\n",
 996                        ap_domain_index);
 997         len += sprintf(resp_buff + len, "Total device count: %d\n",
 998                        zcrypt_device_count);
 999         len += sprintf(resp_buff + len, "PCICA count: %d\n",
1000                        zcrypt_count_type(ZCRYPT_PCICA));
1001         len += sprintf(resp_buff + len, "PCICC count: %d\n",
1002                        zcrypt_count_type(ZCRYPT_PCICC));
1003         len += sprintf(resp_buff + len, "PCIXCC MCL2 count: %d\n",
1004                        zcrypt_count_type(ZCRYPT_PCIXCC_MCL2));
1005         len += sprintf(resp_buff + len, "PCIXCC MCL3 count: %d\n",
1006                        zcrypt_count_type(ZCRYPT_PCIXCC_MCL3));
1007         len += sprintf(resp_buff + len, "CEX2C count: %d\n",
1008                        zcrypt_count_type(ZCRYPT_CEX2C));
1009         len += sprintf(resp_buff + len, "CEX2A count: %d\n",
1010                        zcrypt_count_type(ZCRYPT_CEX2A));
1011         len += sprintf(resp_buff + len, "requestq count: %d\n",
1012                        zcrypt_requestq_count());
1013         len += sprintf(resp_buff + len, "pendingq count: %d\n",
1014                        zcrypt_pendingq_count());
1015         len += sprintf(resp_buff + len, "Total open handles: %d\n\n",
1016                        atomic_read(&zcrypt_open_count));
1017         zcrypt_status_mask(workarea);
1018         len += sprinthx("Online devices: 1=PCICA 2=PCICC 3=PCIXCC(MCL2) "
1019                         "4=PCIXCC(MCL3) 5=CEX2C 6=CEX2A",
1020                         resp_buff+len, workarea, AP_DEVICES);
1021         zcrypt_qdepth_mask(workarea);
1022         len += sprinthx("Waiting work element counts",
1023                         resp_buff+len, workarea, AP_DEVICES);
1024         zcrypt_perdev_reqcnt((int *) workarea);
1025         len += sprinthx4("Per-device successfully completed request counts",
1026                          resp_buff+len,(unsigned int *) workarea, AP_DEVICES);
1027         *eof = 1;
1028         memset((void *) workarea, 0x00, AP_DEVICES * sizeof(unsigned int));
1029         return len;
1030 }
1031
1032 static void zcrypt_disable_card(int index)
1033 {
1034         struct zcrypt_device *zdev;
1035
1036         spin_lock_bh(&zcrypt_device_lock);
1037         list_for_each_entry(zdev, &zcrypt_device_list, list)
1038                 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
1039                         zdev->online = 0;
1040                         ap_flush_queue(zdev->ap_dev);
1041                         break;
1042                 }
1043         spin_unlock_bh(&zcrypt_device_lock);
1044 }
1045
1046 static void zcrypt_enable_card(int index)
1047 {
1048         struct zcrypt_device *zdev;
1049
1050         spin_lock_bh(&zcrypt_device_lock);
1051         list_for_each_entry(zdev, &zcrypt_device_list, list)
1052                 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
1053                         zdev->online = 1;
1054                         break;
1055                 }
1056         spin_unlock_bh(&zcrypt_device_lock);
1057 }
1058
1059 static int zcrypt_status_write(struct file *file, const char __user *buffer,
1060                                unsigned long count, void *data)
1061 {
1062         unsigned char *lbuf, *ptr;
1063         unsigned long local_count;
1064         int j;
1065
1066         if (count <= 0)
1067                 return 0;
1068
1069 #define LBUFSIZE 1200UL
1070         lbuf = kmalloc(LBUFSIZE, GFP_KERNEL);
1071         if (!lbuf)
1072                 return 0;
1073
1074         local_count = min(LBUFSIZE - 1, count);
1075         if (copy_from_user(lbuf, buffer, local_count) != 0) {
1076                 kfree(lbuf);
1077                 return -EFAULT;
1078         }
1079         lbuf[local_count] = '\0';
1080
1081         ptr = strstr(lbuf, "Online devices");
1082         if (!ptr)
1083                 goto out;
1084         ptr = strstr(ptr, "\n");
1085         if (!ptr)
1086                 goto out;
1087         ptr++;
1088
1089         if (strstr(ptr, "Waiting work element counts") == NULL)
1090                 goto out;
1091
1092         for (j = 0; j < 64 && *ptr; ptr++) {
1093                 /*
1094                  * '0' for no device, '1' for PCICA, '2' for PCICC,
1095                  * '3' for PCIXCC_MCL2, '4' for PCIXCC_MCL3,
1096                  * '5' for CEX2C and '6' for CEX2A'
1097                  */
1098                 if (*ptr >= '0' && *ptr <= '6')
1099                         j++;
1100                 else if (*ptr == 'd' || *ptr == 'D')
1101                         zcrypt_disable_card(j++);
1102                 else if (*ptr == 'e' || *ptr == 'E')
1103                         zcrypt_enable_card(j++);
1104                 else if (*ptr != ' ' && *ptr != '\t')
1105                         break;
1106         }
1107 out:
1108         kfree(lbuf);
1109         return count;
1110 }
1111
1112 static int zcrypt_rng_device_count;
1113 static u32 *zcrypt_rng_buffer;
1114 static int zcrypt_rng_buffer_index;
1115 static DEFINE_MUTEX(zcrypt_rng_mutex);
1116
1117 static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
1118 {
1119         int rc;
1120
1121         /*
1122          * We don't need locking here because the RNG API guarantees serialized
1123          * read method calls.
1124          */
1125         if (zcrypt_rng_buffer_index == 0) {
1126                 rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1127                 if (rc < 0)
1128                         return -EIO;
1129                 zcrypt_rng_buffer_index = rc / sizeof *data;
1130         }
1131         *data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index];
1132         return sizeof *data;
1133 }
1134
1135 static struct hwrng zcrypt_rng_dev = {
1136         .name           = "zcrypt",
1137         .data_read      = zcrypt_rng_data_read,
1138 };
1139
1140 static int zcrypt_rng_device_add(void)
1141 {
1142         int rc = 0;
1143
1144         mutex_lock(&zcrypt_rng_mutex);
1145         if (zcrypt_rng_device_count == 0) {
1146                 zcrypt_rng_buffer = (u32 *) get_zeroed_page(GFP_KERNEL);
1147                 if (!zcrypt_rng_buffer) {
1148                         rc = -ENOMEM;
1149                         goto out;
1150                 }
1151                 zcrypt_rng_buffer_index = 0;
1152                 rc = hwrng_register(&zcrypt_rng_dev);
1153                 if (rc)
1154                         goto out_free;
1155                 zcrypt_rng_device_count = 1;
1156         } else
1157                 zcrypt_rng_device_count++;
1158         mutex_unlock(&zcrypt_rng_mutex);
1159         return 0;
1160
1161 out_free:
1162         free_page((unsigned long) zcrypt_rng_buffer);
1163 out:
1164         mutex_unlock(&zcrypt_rng_mutex);
1165         return rc;
1166 }
1167
1168 static void zcrypt_rng_device_remove(void)
1169 {
1170         mutex_lock(&zcrypt_rng_mutex);
1171         zcrypt_rng_device_count--;
1172         if (zcrypt_rng_device_count == 0) {
1173                 hwrng_unregister(&zcrypt_rng_dev);
1174                 free_page((unsigned long) zcrypt_rng_buffer);
1175         }
1176         mutex_unlock(&zcrypt_rng_mutex);
1177 }
1178
1179 /**
1180  * zcrypt_api_init(): Module initialization.
1181  *
1182  * The module initialization code.
1183  */
1184 int __init zcrypt_api_init(void)
1185 {
1186         int rc;
1187
1188         /* Register the request sprayer. */
1189         rc = misc_register(&zcrypt_misc_device);
1190         if (rc < 0)
1191                 goto out;
1192
1193         /* Set up the proc file system */
1194         zcrypt_entry = create_proc_entry("driver/z90crypt", 0644, NULL);
1195         if (!zcrypt_entry) {
1196                 rc = -ENOMEM;
1197                 goto out_misc;
1198         }
1199         zcrypt_entry->data = NULL;
1200         zcrypt_entry->read_proc = zcrypt_status_read;
1201         zcrypt_entry->write_proc = zcrypt_status_write;
1202
1203         return 0;
1204
1205 out_misc:
1206         misc_deregister(&zcrypt_misc_device);
1207 out:
1208         return rc;
1209 }
1210
1211 /**
1212  * zcrypt_api_exit(): Module termination.
1213  *
1214  * The module termination code.
1215  */
1216 void zcrypt_api_exit(void)
1217 {
1218         remove_proc_entry("driver/z90crypt", NULL);
1219         misc_deregister(&zcrypt_misc_device);
1220 }
1221
1222 #ifndef CONFIG_ZCRYPT_MONOLITHIC
1223 module_init(zcrypt_api_init);
1224 module_exit(zcrypt_api_exit);
1225 #endif