kernel/drivers/s390/crypto/zcrypt_api.c

   1 /*
   2  *  zcrypt 2.1.0
   3  *
   4  *  Copyright IBM Corp. 2001, 2012
   5  *  Author(s): Robert Burroughs
   6  *             Eric Rossman (edrossma@us.ibm.com)
   7  *             Cornelia Huck <cornelia.huck@de.ibm.com>
   8  *
   9  *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
  10  *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
  11  *                                Ralph Wuerthner <rwuerthn@de.ibm.com>
  12  *  MSGTYPE restruct:             Holger Dengler <hd@linux.vnet.ibm.com>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2, or (at your option)
  17  * any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/miscdevice.h>
  33 #include <linux/fs.h>
  34 #include <linux/proc_fs.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/compat.h>
  37 #include <linux/slab.h>
  38 #include <linux/atomic.h>
  39 #include <asm/uaccess.h>
  40 #include <linux/hw_random.h>
  41 #include <linux/debugfs.h>
  42 #include <asm/debug.h>
  43
  44 #include "zcrypt_debug.h"
  45 #include "zcrypt_api.h"
  46
  47 #include "zcrypt_msgtype6.h"
  48
  49 /*
  50  * Module description.
  51  */
  52 MODULE_AUTHOR("IBM Corporation");
  53 MODULE_DESCRIPTION("Cryptographic Coprocessor interface, " \
  54                    "Copyright IBM Corp. 2001, 2012");
  55 MODULE_LICENSE("GPL");
  56
  57 static int zcrypt_hwrng_seed = 1;
  58 module_param_named(hwrng_seed, zcrypt_hwrng_seed, int, S_IRUSR|S_IRGRP);
  59 MODULE_PARM_DESC(hwrng_seed, "Turn on/off hwrng auto seed, default is 1 (on).");
  60
  61 static DEFINE_SPINLOCK(zcrypt_device_lock);
  62 static LIST_HEAD(zcrypt_device_list);
  63 static int zcrypt_device_count = 0;
  64 static atomic_t zcrypt_open_count = ATOMIC_INIT(0);
  65 static atomic_t zcrypt_rescan_count = ATOMIC_INIT(0);
  66
  67 atomic_t zcrypt_rescan_req = ATOMIC_INIT(0);
  68 EXPORT_SYMBOL(zcrypt_rescan_req);
  69
  70 static int zcrypt_rng_device_add(void);
  71 static void zcrypt_rng_device_remove(void);
  72
  73 static DEFINE_SPINLOCK(zcrypt_ops_list_lock);
  74 static LIST_HEAD(zcrypt_ops_list);
  75
  76 static debug_info_t *zcrypt_dbf_common;
  77 static debug_info_t *zcrypt_dbf_devices;
  78 static struct dentry *debugfs_root;
  79
  80 /*
  81  * Device attributes common for all crypto devices.
  82  */
  83 static ssize_t zcrypt_type_show(struct device *dev,
  84                                 struct device_attribute *attr, char *buf)
  85 {
  86         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
  87         return snprintf(buf, PAGE_SIZE, "%s\n", zdev->type_string);
  88 }
  89
  90 static DEVICE_ATTR(type, 0444, zcrypt_type_show, NULL);
  91
  92 static ssize_t zcrypt_online_show(struct device *dev,
  93                                   struct device_attribute *attr, char *buf)
  94 {
  95         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
  96         return snprintf(buf, PAGE_SIZE, "%d\n", zdev->online);
  97 }
  98
  99 static ssize_t zcrypt_online_store(struct device *dev,
 100                                    struct device_attribute *attr,
 101                                    const char *buf, size_t count)
 102 {
 103         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
 104         int online;
 105
 106         if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
 107                 return -EINVAL;
 108         zdev->online = online;
 109         ZCRYPT_DBF_DEV(DBF_INFO, zdev, "dev%04xo%dman", zdev->ap_dev->qid,
 110                        zdev->online);
 111         if (!online)
 112                 ap_flush_queue(zdev->ap_dev);
 113         return count;
 114 }
 115
 116 static DEVICE_ATTR(online, 0644, zcrypt_online_show, zcrypt_online_store);
 117
 118 static struct attribute * zcrypt_device_attrs[] = {
 119         &dev_attr_type.attr,
 120         &dev_attr_online.attr,
 121         NULL,
 122 };
 123
 124 static struct attribute_group zcrypt_device_attr_group = {
 125         .attrs = zcrypt_device_attrs,
 126 };
 127
 128 /**
 129  * Process a rescan of the transport layer.
 130  *
 131  * Returns 1, if the rescan has been processed, otherwise 0.
 132  */
 133 static inline int zcrypt_process_rescan(void)
 134 {
 135         if (atomic_read(&zcrypt_rescan_req)) {
 136                 atomic_set(&zcrypt_rescan_req, 0);
 137                 atomic_inc(&zcrypt_rescan_count);
 138                 ap_bus_force_rescan();
 139                 ZCRYPT_DBF_COMMON(DBF_INFO, "rescan%07d",
 140                                   atomic_inc_return(&zcrypt_rescan_count));
 141                 return 1;
 142         }
 143         return 0;
 144 }
 145
 146 /**
 147  * __zcrypt_increase_preference(): Increase preference of a crypto device.
 148  * @zdev: Pointer the crypto device
 149  *
 150  * Move the device towards the head of the device list.
 151  * Need to be called while holding the zcrypt device list lock.
 152  * Note: cards with speed_rating of 0 are kept at the end of the list.
 153  */
 154 static void __zcrypt_increase_preference(struct zcrypt_device *zdev)
 155 {
 156         struct zcrypt_device *tmp;
 157         struct list_head *l;
 158
 159         if (zdev->speed_rating == 0)
 160                 return;
 161         for (l = zdev->list.prev; l != &zcrypt_device_list; l = l->prev) {
 162                 tmp = list_entry(l, struct zcrypt_device, list);
 163                 if ((tmp->request_count + 1) * tmp->speed_rating <=
 164                     (zdev->request_count + 1) * zdev->speed_rating &&
 165                     tmp->speed_rating != 0)
 166                         break;
 167         }
 168         if (l == zdev->list.prev)
 169                 return;
 170         /* Move zdev behind l */
 171         list_move(&zdev->list, l);
 172 }
 173
 174 /**
 175  * __zcrypt_decrease_preference(): Decrease preference of a crypto device.
 176  * @zdev: Pointer to a crypto device.
 177  *
 178  * Move the device towards the tail of the device list.
 179  * Need to be called while holding the zcrypt device list lock.
 180  * Note: cards with speed_rating of 0 are kept at the end of the list.
 181  */
 182 static void __zcrypt_decrease_preference(struct zcrypt_device *zdev)
 183 {
 184         struct zcrypt_device *tmp;
 185         struct list_head *l;
 186
 187         if (zdev->speed_rating == 0)
 188                 return;
 189         for (l = zdev->list.next; l != &zcrypt_device_list; l = l->next) {
 190                 tmp = list_entry(l, struct zcrypt_device, list);
 191                 if ((tmp->request_count + 1) * tmp->speed_rating >
 192                     (zdev->request_count + 1) * zdev->speed_rating ||
 193                     tmp->speed_rating == 0)
 194                         break;
 195         }
 196         if (l == zdev->list.next)
 197                 return;
 198         /* Move zdev before l */
 199         list_move_tail(&zdev->list, l);
 200 }
 201
 202 static void zcrypt_device_release(struct kref *kref)
 203 {
 204         struct zcrypt_device *zdev =
 205                 container_of(kref, struct zcrypt_device, refcount);
 206         zcrypt_device_free(zdev);
 207 }
 208
 209 void zcrypt_device_get(struct zcrypt_device *zdev)
 210 {
 211         kref_get(&zdev->refcount);
 212 }
 213 EXPORT_SYMBOL(zcrypt_device_get);
 214
 215 int zcrypt_device_put(struct zcrypt_device *zdev)
 216 {
 217         return kref_put(&zdev->refcount, zcrypt_device_release);
 218 }
 219 EXPORT_SYMBOL(zcrypt_device_put);
 220
 221 struct zcrypt_device *zcrypt_device_alloc(size_t max_response_size)
 222 {
 223         struct zcrypt_device *zdev;
 224
 225         zdev = kzalloc(sizeof(struct zcrypt_device), GFP_KERNEL);
 226         if (!zdev)
 227                 return NULL;
 228         zdev->reply.message = kmalloc(max_response_size, GFP_KERNEL);
 229         if (!zdev->reply.message)
 230                 goto out_free;
 231         zdev->reply.length = max_response_size;
 232         spin_lock_init(&zdev->lock);
 233         INIT_LIST_HEAD(&zdev->list);
 234         zdev->dbf_area = zcrypt_dbf_devices;
 235         return zdev;
 236
 237 out_free:
 238         kfree(zdev);
 239         return NULL;
 240 }
 241 EXPORT_SYMBOL(zcrypt_device_alloc);
 242
 243 void zcrypt_device_free(struct zcrypt_device *zdev)
 244 {
 245         kfree(zdev->reply.message);
 246         kfree(zdev);
 247 }
 248 EXPORT_SYMBOL(zcrypt_device_free);
 249
 250 /**
 251  * zcrypt_device_register() - Register a crypto device.
 252  * @zdev: Pointer to a crypto device
 253  *
 254  * Register a crypto device. Returns 0 if successful.
 255  */
 256 int zcrypt_device_register(struct zcrypt_device *zdev)
 257 {
 258         int rc;
 259
 260         if (!zdev->ops)
 261                 return -ENODEV;
 262         rc = sysfs_create_group(&zdev->ap_dev->device.kobj,
 263                                 &zcrypt_device_attr_group);
 264         if (rc)
 265                 goto out;
 266         get_device(&zdev->ap_dev->device);
 267         kref_init(&zdev->refcount);
 268         spin_lock_bh(&zcrypt_device_lock);
 269         zdev->online = 1;       /* New devices are online by default. */
 270         ZCRYPT_DBF_DEV(DBF_INFO, zdev, "dev%04xo%dreg", zdev->ap_dev->qid,
 271                        zdev->online);
 272         list_add_tail(&zdev->list, &zcrypt_device_list);
 273         __zcrypt_increase_preference(zdev);
 274         zcrypt_device_count++;
 275         spin_unlock_bh(&zcrypt_device_lock);
 276         if (zdev->ops->rng) {
 277                 rc = zcrypt_rng_device_add();
 278                 if (rc)
 279                         goto out_unregister;
 280         }
 281         return 0;
 282
 283 out_unregister:
 284         spin_lock_bh(&zcrypt_device_lock);
 285         zcrypt_device_count--;
 286         list_del_init(&zdev->list);
 287         spin_unlock_bh(&zcrypt_device_lock);
 288         sysfs_remove_group(&zdev->ap_dev->device.kobj,
 289                            &zcrypt_device_attr_group);
 290         put_device(&zdev->ap_dev->device);
 291         zcrypt_device_put(zdev);
 292 out:
 293         return rc;
 294 }
 295 EXPORT_SYMBOL(zcrypt_device_register);
 296
 297 /**
 298  * zcrypt_device_unregister(): Unregister a crypto device.
 299  * @zdev: Pointer to crypto device
 300  *
 301  * Unregister a crypto device.
 302  */
 303 void zcrypt_device_unregister(struct zcrypt_device *zdev)
 304 {
 305         if (zdev->ops->rng)
 306                 zcrypt_rng_device_remove();
 307         spin_lock_bh(&zcrypt_device_lock);
 308         zcrypt_device_count--;
 309         list_del_init(&zdev->list);
 310         spin_unlock_bh(&zcrypt_device_lock);
 311         sysfs_remove_group(&zdev->ap_dev->device.kobj,
 312                            &zcrypt_device_attr_group);
 313         put_device(&zdev->ap_dev->device);
 314         zcrypt_device_put(zdev);
 315 }
 316 EXPORT_SYMBOL(zcrypt_device_unregister);
 317
 318 void zcrypt_msgtype_register(struct zcrypt_ops *zops)
 319 {
 320         spin_lock_bh(&zcrypt_ops_list_lock);
 321         list_add_tail(&zops->list, &zcrypt_ops_list);
 322         spin_unlock_bh(&zcrypt_ops_list_lock);
 323 }
 324 EXPORT_SYMBOL(zcrypt_msgtype_register);
 325
 326 void zcrypt_msgtype_unregister(struct zcrypt_ops *zops)
 327 {
 328         spin_lock_bh(&zcrypt_ops_list_lock);
 329         list_del_init(&zops->list);
 330         spin_unlock_bh(&zcrypt_ops_list_lock);
 331 }
 332 EXPORT_SYMBOL(zcrypt_msgtype_unregister);
 333
 334 static inline
 335 struct zcrypt_ops *__ops_lookup(unsigned char *name, int variant)
 336 {
 337         struct zcrypt_ops *zops;
 338         int found = 0;
 339
 340         spin_lock_bh(&zcrypt_ops_list_lock);
 341         list_for_each_entry(zops, &zcrypt_ops_list, list) {
 342                 if ((zops->variant == variant) &&
 343                     (!strncmp(zops->name, name, sizeof(zops->name)))) {
 344                         found = 1;
 345                         break;
 346                 }
 347         }
 348         if (!found || !try_module_get(zops->owner))
 349                 zops = NULL;
 350
 351         spin_unlock_bh(&zcrypt_ops_list_lock);
 352
 353         return zops;
 354 }
 355
 356 struct zcrypt_ops *zcrypt_msgtype_request(unsigned char *name, int variant)
 357 {
 358         struct zcrypt_ops *zops = NULL;
 359
 360         zops = __ops_lookup(name, variant);
 361         if (!zops) {
 362                 request_module("%s", name);
 363                 zops = __ops_lookup(name, variant);
 364         }
 365         return zops;
 366 }
 367 EXPORT_SYMBOL(zcrypt_msgtype_request);
 368
 369 void zcrypt_msgtype_release(struct zcrypt_ops *zops)
 370 {
 371         if (zops)
 372                 module_put(zops->owner);
 373 }
 374 EXPORT_SYMBOL(zcrypt_msgtype_release);
 375
 376 /**
 377  * zcrypt_read (): Not supported beyond zcrypt 1.3.1.
 378  *
 379  * This function is not supported beyond zcrypt 1.3.1.
 380  */
 381 static ssize_t zcrypt_read(struct file *filp, char __user *buf,
 382                            size_t count, loff_t *f_pos)
 383 {
 384         return -EPERM;
 385 }
 386
 387 /**
 388  * zcrypt_write(): Not allowed.
 389  *
 390  * Write is is not allowed
 391  */
 392 static ssize_t zcrypt_write(struct file *filp, const char __user *buf,
 393                             size_t count, loff_t *f_pos)
 394 {
 395         return -EPERM;
 396 }
 397
 398 /**
 399  * zcrypt_open(): Count number of users.
 400  *
 401  * Device open function to count number of users.
 402  */
 403 static int zcrypt_open(struct inode *inode, struct file *filp)
 404 {
 405         atomic_inc(&zcrypt_open_count);
 406         return nonseekable_open(inode, filp);
 407 }
 408
 409 /**
 410  * zcrypt_release(): Count number of users.
 411  *
 412  * Device close function to count number of users.
 413  */
 414 static int zcrypt_release(struct inode *inode, struct file *filp)
 415 {
 416         atomic_dec(&zcrypt_open_count);
 417         return 0;
 418 }
 419
 420 /*
 421  * zcrypt ioctls.
 422  */
 423 static long zcrypt_rsa_modexpo(struct ica_rsa_modexpo *mex)
 424 {
 425         struct zcrypt_device *zdev;
 426         int rc;
 427
 428         if (mex->outputdatalength < mex->inputdatalength)
 429                 return -EINVAL;
 430         /*
 431          * As long as outputdatalength is big enough, we can set the
 432          * outputdatalength equal to the inputdatalength, since that is the
 433          * number of bytes we will copy in any case
 434          */
 435         mex->outputdatalength = mex->inputdatalength;
 436
 437         spin_lock_bh(&zcrypt_device_lock);
 438         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 439                 if (!zdev->online ||
 440                     !zdev->ops->rsa_modexpo ||
 441                     zdev->min_mod_size > mex->inputdatalength ||
 442                     zdev->max_mod_size < mex->inputdatalength)
 443                         continue;
 444                 zcrypt_device_get(zdev);
 445                 get_device(&zdev->ap_dev->device);
 446                 zdev->request_count++;
 447                 __zcrypt_decrease_preference(zdev);
 448                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 449                         spin_unlock_bh(&zcrypt_device_lock);
 450                         rc = zdev->ops->rsa_modexpo(zdev, mex);
 451                         spin_lock_bh(&zcrypt_device_lock);
 452                         module_put(zdev->ap_dev->drv->driver.owner);
 453                 }
 454                 else
 455                         rc = -EAGAIN;
 456                 zdev->request_count--;
 457                 __zcrypt_increase_preference(zdev);
 458                 put_device(&zdev->ap_dev->device);
 459                 zcrypt_device_put(zdev);
 460                 spin_unlock_bh(&zcrypt_device_lock);
 461                 return rc;
 462         }
 463         spin_unlock_bh(&zcrypt_device_lock);
 464         return -ENODEV;
 465 }
 466
 467 static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt)
 468 {
 469         struct zcrypt_device *zdev;
 470         unsigned long long z1, z2, z3;
 471         int rc, copied;
 472
 473         if (crt->outputdatalength < crt->inputdatalength)
 474                 return -EINVAL;
 475         /*
 476          * As long as outputdatalength is big enough, we can set the
 477          * outputdatalength equal to the inputdatalength, since that is the
 478          * number of bytes we will copy in any case
 479          */
 480         crt->outputdatalength = crt->inputdatalength;
 481
 482         copied = 0;
 483  restart:
 484         spin_lock_bh(&zcrypt_device_lock);
 485         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 486                 if (!zdev->online ||
 487                     !zdev->ops->rsa_modexpo_crt ||
 488                     zdev->min_mod_size > crt->inputdatalength ||
 489                     zdev->max_mod_size < crt->inputdatalength)
 490                         continue;
 491                 if (zdev->short_crt && crt->inputdatalength > 240) {
 492                         /*
 493                          * Check inputdata for leading zeros for cards
 494                          * that can't handle np_prime, bp_key, or
 495                          * u_mult_inv > 128 bytes.
 496                          */
 497                         if (copied == 0) {
 498                                 unsigned int len;
 499                                 spin_unlock_bh(&zcrypt_device_lock);
 500                                 /* len is max 256 / 2 - 120 = 8
 501                                  * For bigger device just assume len of leading
 502                                  * 0s is 8 as stated in the requirements for
 503                                  * ica_rsa_modexpo_crt struct in zcrypt.h.
 504                                  */
 505                                 if (crt->inputdatalength <= 256)
 506                                         len = crt->inputdatalength / 2 - 120;
 507                                 else
 508                                         len = 8;
 509                                 if (len > sizeof(z1))
 510                                         return -EFAULT;
 511                                 z1 = z2 = z3 = 0;
 512                                 if (copy_from_user(&z1, crt->np_prime, len) ||
 513                                     copy_from_user(&z2, crt->bp_key, len) ||
 514                                     copy_from_user(&z3, crt->u_mult_inv, len))
 515                                         return -EFAULT;
 516                                 z1 = z2 = z3 = 0;
 517                                 copied = 1;
 518                                 /*
 519                                  * We have to restart device lookup -
 520                                  * the device list may have changed by now.
 521                                  */
 522                                 goto restart;
 523                         }
 524                         if (z1 != 0ULL || z2 != 0ULL || z3 != 0ULL)
 525                                 /* The device can't handle this request. */
 526                                 continue;
 527                 }
 528                 zcrypt_device_get(zdev);
 529                 get_device(&zdev->ap_dev->device);
 530                 zdev->request_count++;
 531                 __zcrypt_decrease_preference(zdev);
 532                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 533                         spin_unlock_bh(&zcrypt_device_lock);
 534                         rc = zdev->ops->rsa_modexpo_crt(zdev, crt);
 535                         spin_lock_bh(&zcrypt_device_lock);
 536                         module_put(zdev->ap_dev->drv->driver.owner);
 537                 }
 538                 else
 539                         rc = -EAGAIN;
 540                 zdev->request_count--;
 541                 __zcrypt_increase_preference(zdev);
 542                 put_device(&zdev->ap_dev->device);
 543                 zcrypt_device_put(zdev);
 544                 spin_unlock_bh(&zcrypt_device_lock);
 545                 return rc;
 546         }
 547         spin_unlock_bh(&zcrypt_device_lock);
 548         return -ENODEV;
 549 }
 550
 551 static long zcrypt_send_cprb(struct ica_xcRB *xcRB)
 552 {
 553         struct zcrypt_device *zdev;
 554         int rc;
 555
 556         spin_lock_bh(&zcrypt_device_lock);
 557         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 558                 if (!zdev->online || !zdev->ops->send_cprb ||
 559                    (zdev->ops->variant == MSGTYPE06_VARIANT_EP11) ||
 560                    (xcRB->user_defined != AUTOSELECT &&
 561                     AP_QID_DEVICE(zdev->ap_dev->qid) != xcRB->user_defined))
 562                         continue;
 563                 zcrypt_device_get(zdev);
 564                 get_device(&zdev->ap_dev->device);
 565                 zdev->request_count++;
 566                 __zcrypt_decrease_preference(zdev);
 567                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 568                         spin_unlock_bh(&zcrypt_device_lock);
 569                         rc = zdev->ops->send_cprb(zdev, xcRB);
 570                         spin_lock_bh(&zcrypt_device_lock);
 571                         module_put(zdev->ap_dev->drv->driver.owner);
 572                 }
 573                 else
 574                         rc = -EAGAIN;
 575                 zdev->request_count--;
 576                 __zcrypt_increase_preference(zdev);
 577                 put_device(&zdev->ap_dev->device);
 578                 zcrypt_device_put(zdev);
 579                 spin_unlock_bh(&zcrypt_device_lock);
 580                 return rc;
 581         }
 582         spin_unlock_bh(&zcrypt_device_lock);
 583         return -ENODEV;
 584 }
 585
 586 struct ep11_target_dev_list {
 587         unsigned short          targets_num;
 588         struct ep11_target_dev  *targets;
 589 };
 590
 591 static bool is_desired_ep11dev(unsigned int dev_qid,
 592                                struct ep11_target_dev_list dev_list)
 593 {
 594         int n;
 595
 596         for (n = 0; n < dev_list.targets_num; n++, dev_list.targets++) {
 597                 if ((AP_QID_DEVICE(dev_qid) == dev_list.targets->ap_id) &&
 598                     (AP_QID_QUEUE(dev_qid) == dev_list.targets->dom_id)) {
 599                         return true;
 600                 }
 601         }
 602         return false;
 603 }
 604
 605 static long zcrypt_send_ep11_cprb(struct ep11_urb *xcrb)
 606 {
 607         struct zcrypt_device *zdev;
 608         bool autoselect = false;
 609         int rc;
 610         struct ep11_target_dev_list ep11_dev_list = {
 611                 .targets_num    =  0x00,
 612                 .targets        =  NULL,
 613         };
 614
 615         ep11_dev_list.targets_num = (unsigned short) xcrb->targets_num;
 616
 617         /* empty list indicates autoselect (all available targets) */
 618         if (ep11_dev_list.targets_num == 0)
 619                 autoselect = true;
 620         else {
 621                 ep11_dev_list.targets = kcalloc((unsigned short)
 622                                                 xcrb->targets_num,
 623                                                 sizeof(struct ep11_target_dev),
 624                                                 GFP_KERNEL);
 625                 if (!ep11_dev_list.targets)
 626                         return -ENOMEM;
 627
 628                 if (copy_from_user(ep11_dev_list.targets,
 629                                    (struct ep11_target_dev __force __user *)
 630                                    xcrb->targets, xcrb->targets_num *
 631                                    sizeof(struct ep11_target_dev)))
 632                         return -EFAULT;
 633         }
 634
 635         spin_lock_bh(&zcrypt_device_lock);
 636         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 637                 /* check if device is eligible */
 638                 if (!zdev->online ||
 639                     zdev->ops->variant != MSGTYPE06_VARIANT_EP11)
 640                         continue;
 641
 642                 /* check if device is selected as valid target */
 643                 if (!is_desired_ep11dev(zdev->ap_dev->qid, ep11_dev_list) &&
 644                     !autoselect)
 645                         continue;
 646
 647                 zcrypt_device_get(zdev);
 648                 get_device(&zdev->ap_dev->device);
 649                 zdev->request_count++;
 650                 __zcrypt_decrease_preference(zdev);
 651                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 652                         spin_unlock_bh(&zcrypt_device_lock);
 653                         rc = zdev->ops->send_ep11_cprb(zdev, xcrb);
 654                         spin_lock_bh(&zcrypt_device_lock);
 655                         module_put(zdev->ap_dev->drv->driver.owner);
 656                 } else {
 657                         rc = -EAGAIN;
 658                   }
 659                 zdev->request_count--;
 660                 __zcrypt_increase_preference(zdev);
 661                 put_device(&zdev->ap_dev->device);
 662                 zcrypt_device_put(zdev);
 663                 spin_unlock_bh(&zcrypt_device_lock);
 664                 return rc;
 665         }
 666         spin_unlock_bh(&zcrypt_device_lock);
 667         return -ENODEV;
 668 }
 669
 670 static long zcrypt_rng(char *buffer)
 671 {
 672         struct zcrypt_device *zdev;
 673         int rc;
 674
 675         spin_lock_bh(&zcrypt_device_lock);
 676         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 677                 if (!zdev->online || !zdev->ops->rng)
 678                         continue;
 679                 zcrypt_device_get(zdev);
 680                 get_device(&zdev->ap_dev->device);
 681                 zdev->request_count++;
 682                 __zcrypt_decrease_preference(zdev);
 683                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 684                         spin_unlock_bh(&zcrypt_device_lock);
 685                         rc = zdev->ops->rng(zdev, buffer);
 686                         spin_lock_bh(&zcrypt_device_lock);
 687                         module_put(zdev->ap_dev->drv->driver.owner);
 688                 } else
 689                         rc = -EAGAIN;
 690                 zdev->request_count--;
 691                 __zcrypt_increase_preference(zdev);
 692                 put_device(&zdev->ap_dev->device);
 693                 zcrypt_device_put(zdev);
 694                 spin_unlock_bh(&zcrypt_device_lock);
 695                 return rc;
 696         }
 697         spin_unlock_bh(&zcrypt_device_lock);
 698         return -ENODEV;
 699 }
 700
 701 static void zcrypt_status_mask(char status[AP_DEVICES])
 702 {
 703         struct zcrypt_device *zdev;
 704
 705         memset(status, 0, sizeof(char) * AP_DEVICES);
 706         spin_lock_bh(&zcrypt_device_lock);
 707         list_for_each_entry(zdev, &zcrypt_device_list, list)
 708                 status[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 709                         zdev->online ? zdev->user_space_type : 0x0d;
 710         spin_unlock_bh(&zcrypt_device_lock);
 711 }
 712
 713 static void zcrypt_qdepth_mask(char qdepth[AP_DEVICES])
 714 {
 715         struct zcrypt_device *zdev;
 716
 717         memset(qdepth, 0, sizeof(char)  * AP_DEVICES);
 718         spin_lock_bh(&zcrypt_device_lock);
 719         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 720                 spin_lock(&zdev->ap_dev->lock);
 721                 qdepth[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 722                         zdev->ap_dev->pendingq_count +
 723                         zdev->ap_dev->requestq_count;
 724                 spin_unlock(&zdev->ap_dev->lock);
 725         }
 726         spin_unlock_bh(&zcrypt_device_lock);
 727 }
 728
 729 static void zcrypt_perdev_reqcnt(int reqcnt[AP_DEVICES])
 730 {
 731         struct zcrypt_device *zdev;
 732
 733         memset(reqcnt, 0, sizeof(int) * AP_DEVICES);
 734         spin_lock_bh(&zcrypt_device_lock);
 735         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 736                 spin_lock(&zdev->ap_dev->lock);
 737                 reqcnt[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 738                         zdev->ap_dev->total_request_count;
 739                 spin_unlock(&zdev->ap_dev->lock);
 740         }
 741         spin_unlock_bh(&zcrypt_device_lock);
 742 }
 743
 744 static int zcrypt_pendingq_count(void)
 745 {
 746         struct zcrypt_device *zdev;
 747         int pendingq_count = 0;
 748
 749         spin_lock_bh(&zcrypt_device_lock);
 750         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 751                 spin_lock(&zdev->ap_dev->lock);
 752                 pendingq_count += zdev->ap_dev->pendingq_count;
 753                 spin_unlock(&zdev->ap_dev->lock);
 754         }
 755         spin_unlock_bh(&zcrypt_device_lock);
 756         return pendingq_count;
 757 }
 758
 759 static int zcrypt_requestq_count(void)
 760 {
 761         struct zcrypt_device *zdev;
 762         int requestq_count = 0;
 763
 764         spin_lock_bh(&zcrypt_device_lock);
 765         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 766                 spin_lock(&zdev->ap_dev->lock);
 767                 requestq_count += zdev->ap_dev->requestq_count;
 768                 spin_unlock(&zdev->ap_dev->lock);
 769         }
 770         spin_unlock_bh(&zcrypt_device_lock);
 771         return requestq_count;
 772 }
 773
 774 static int zcrypt_count_type(int type)
 775 {
 776         struct zcrypt_device *zdev;
 777         int device_count = 0;
 778
 779         spin_lock_bh(&zcrypt_device_lock);
 780         list_for_each_entry(zdev, &zcrypt_device_list, list)
 781                 if (zdev->user_space_type == type)
 782                         device_count++;
 783         spin_unlock_bh(&zcrypt_device_lock);
 784         return device_count;
 785 }
 786
 787 /**
 788  * zcrypt_ica_status(): Old, depracted combi status call.
 789  *
 790  * Old, deprecated combi status call.
 791  */
 792 static long zcrypt_ica_status(struct file *filp, unsigned long arg)
 793 {
 794         struct ica_z90_status *pstat;
 795         int ret;
 796
 797         pstat = kzalloc(sizeof(*pstat), GFP_KERNEL);
 798         if (!pstat)
 799                 return -ENOMEM;
 800         pstat->totalcount = zcrypt_device_count;
 801         pstat->leedslitecount = zcrypt_count_type(ZCRYPT_PCICA);
 802         pstat->leeds2count = zcrypt_count_type(ZCRYPT_PCICC);
 803         pstat->requestqWaitCount = zcrypt_requestq_count();
 804         pstat->pendingqWaitCount = zcrypt_pendingq_count();
 805         pstat->totalOpenCount = atomic_read(&zcrypt_open_count);
 806         pstat->cryptoDomain = ap_domain_index;
 807         zcrypt_status_mask(pstat->status);
 808         zcrypt_qdepth_mask(pstat->qdepth);
 809         ret = 0;
 810         if (copy_to_user((void __user *) arg, pstat, sizeof(*pstat)))
 811                 ret = -EFAULT;
 812         kfree(pstat);
 813         return ret;
 814 }
 815
 816 static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
 817                                   unsigned long arg)
 818 {
 819         int rc;
 820
 821         switch (cmd) {
 822         case ICARSAMODEXPO: {
 823                 struct ica_rsa_modexpo __user *umex = (void __user *) arg;
 824                 struct ica_rsa_modexpo mex;
 825                 if (copy_from_user(&mex, umex, sizeof(mex)))
 826                         return -EFAULT;
 827                 do {
 828                         rc = zcrypt_rsa_modexpo(&mex);
 829                 } while (rc == -EAGAIN);
 830                 /* on failure: retry once again after a requested rescan */
 831                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
 832                         do {
 833                                 rc = zcrypt_rsa_modexpo(&mex);
 834                         } while (rc == -EAGAIN);
 835                 if (rc)
 836                         return rc;
 837                 return put_user(mex.outputdatalength, &umex->outputdatalength);
 838         }
 839         case ICARSACRT: {
 840                 struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg;
 841                 struct ica_rsa_modexpo_crt crt;
 842                 if (copy_from_user(&crt, ucrt, sizeof(crt)))
 843                         return -EFAULT;
 844                 do {
 845                         rc = zcrypt_rsa_crt(&crt);
 846                 } while (rc == -EAGAIN);
 847                 /* on failure: retry once again after a requested rescan */
 848                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
 849                         do {
 850                                 rc = zcrypt_rsa_crt(&crt);
 851                         } while (rc == -EAGAIN);
 852                 if (rc)
 853                         return rc;
 854                 return put_user(crt.outputdatalength, &ucrt->outputdatalength);
 855         }
 856         case ZSECSENDCPRB: {
 857                 struct ica_xcRB __user *uxcRB = (void __user *) arg;
 858                 struct ica_xcRB xcRB;
 859                 if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB)))
 860                         return -EFAULT;
 861                 do {
 862                         rc = zcrypt_send_cprb(&xcRB);
 863                 } while (rc == -EAGAIN);
 864                 /* on failure: retry once again after a requested rescan */
 865                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
 866                         do {
 867                                 rc = zcrypt_send_cprb(&xcRB);
 868                         } while (rc == -EAGAIN);
 869                 if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB)))
 870                         return -EFAULT;
 871                 return rc;
 872         }
 873         case ZSENDEP11CPRB: {
 874                 struct ep11_urb __user *uxcrb = (void __user *)arg;
 875                 struct ep11_urb xcrb;
 876                 if (copy_from_user(&xcrb, uxcrb, sizeof(xcrb)))
 877                         return -EFAULT;
 878                 do {
 879                         rc = zcrypt_send_ep11_cprb(&xcrb);
 880                 } while (rc == -EAGAIN);
 881                 /* on failure: retry once again after a requested rescan */
 882                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
 883                         do {
 884                                 rc = zcrypt_send_ep11_cprb(&xcrb);
 885                         } while (rc == -EAGAIN);
 886                 if (copy_to_user(uxcrb, &xcrb, sizeof(xcrb)))
 887                         return -EFAULT;
 888                 return rc;
 889         }
 890         case Z90STAT_STATUS_MASK: {
 891                 char status[AP_DEVICES];
 892                 zcrypt_status_mask(status);
 893                 if (copy_to_user((char __user *) arg, status,
 894                                  sizeof(char) * AP_DEVICES))
 895                         return -EFAULT;
 896                 return 0;
 897         }
 898         case Z90STAT_QDEPTH_MASK: {
 899                 char qdepth[AP_DEVICES];
 900                 zcrypt_qdepth_mask(qdepth);
 901                 if (copy_to_user((char __user *) arg, qdepth,
 902                                  sizeof(char) * AP_DEVICES))
 903                         return -EFAULT;
 904                 return 0;
 905         }
 906         case Z90STAT_PERDEV_REQCNT: {
 907                 int reqcnt[AP_DEVICES];
 908                 zcrypt_perdev_reqcnt(reqcnt);
 909                 if (copy_to_user((int __user *) arg, reqcnt,
 910                                  sizeof(int) * AP_DEVICES))
 911                         return -EFAULT;
 912                 return 0;
 913         }
 914         case Z90STAT_REQUESTQ_COUNT:
 915                 return put_user(zcrypt_requestq_count(), (int __user *) arg);
 916         case Z90STAT_PENDINGQ_COUNT:
 917                 return put_user(zcrypt_pendingq_count(), (int __user *) arg);
 918         case Z90STAT_TOTALOPEN_COUNT:
 919                 return put_user(atomic_read(&zcrypt_open_count),
 920                                 (int __user *) arg);
 921         case Z90STAT_DOMAIN_INDEX:
 922                 return put_user(ap_domain_index, (int __user *) arg);
 923         /*
 924          * Deprecated ioctls. Don't add another device count ioctl,
 925          * you can count them yourself in the user space with the
 926          * output of the Z90STAT_STATUS_MASK ioctl.
 927          */
 928         case ICAZ90STATUS:
 929                 return zcrypt_ica_status(filp, arg);
 930         case Z90STAT_TOTALCOUNT:
 931                 return put_user(zcrypt_device_count, (int __user *) arg);
 932         case Z90STAT_PCICACOUNT:
 933                 return put_user(zcrypt_count_type(ZCRYPT_PCICA),
 934                                 (int __user *) arg);
 935         case Z90STAT_PCICCCOUNT:
 936                 return put_user(zcrypt_count_type(ZCRYPT_PCICC),
 937                                 (int __user *) arg);
 938         case Z90STAT_PCIXCCMCL2COUNT:
 939                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2),
 940                                 (int __user *) arg);
 941         case Z90STAT_PCIXCCMCL3COUNT:
 942                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
 943                                 (int __user *) arg);
 944         case Z90STAT_PCIXCCCOUNT:
 945                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2) +
 946                                 zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
 947                                 (int __user *) arg);
 948         case Z90STAT_CEX2CCOUNT:
 949                 return put_user(zcrypt_count_type(ZCRYPT_CEX2C),
 950                                 (int __user *) arg);
 951         case Z90STAT_CEX2ACOUNT:
 952                 return put_user(zcrypt_count_type(ZCRYPT_CEX2A),
 953                                 (int __user *) arg);
 954         default:
 955                 /* unknown ioctl number */
 956                 return -ENOIOCTLCMD;
 957         }
 958 }
 959
 960 #ifdef CONFIG_COMPAT
 961 /*
 962  * ioctl32 conversion routines
 963  */
 964 struct compat_ica_rsa_modexpo {
 965         compat_uptr_t   inputdata;
 966         unsigned int    inputdatalength;
 967         compat_uptr_t   outputdata;
 968         unsigned int    outputdatalength;
 969         compat_uptr_t   b_key;
 970         compat_uptr_t   n_modulus;
 971 };
 972
 973 static long trans_modexpo32(struct file *filp, unsigned int cmd,
 974                             unsigned long arg)
 975 {
 976         struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg);
 977         struct compat_ica_rsa_modexpo mex32;
 978         struct ica_rsa_modexpo mex64;
 979         long rc;
 980
 981         if (copy_from_user(&mex32, umex32, sizeof(mex32)))
 982                 return -EFAULT;
 983         mex64.inputdata = compat_ptr(mex32.inputdata);
 984         mex64.inputdatalength = mex32.inputdatalength;
 985         mex64.outputdata = compat_ptr(mex32.outputdata);
 986         mex64.outputdatalength = mex32.outputdatalength;
 987         mex64.b_key = compat_ptr(mex32.b_key);
 988         mex64.n_modulus = compat_ptr(mex32.n_modulus);
 989         do {
 990                 rc = zcrypt_rsa_modexpo(&mex64);
 991         } while (rc == -EAGAIN);
 992         /* on failure: retry once again after a requested rescan */
 993         if ((rc == -ENODEV) && (zcrypt_process_rescan()))
 994                 do {
 995                         rc = zcrypt_rsa_modexpo(&mex64);
 996                 } while (rc == -EAGAIN);
 997         if (rc)
 998                 return rc;
 999         return put_user(mex64.outputdatalength,
1000                         &umex32->outputdatalength);
1001 }
1002
1003 struct compat_ica_rsa_modexpo_crt {
1004         compat_uptr_t   inputdata;
1005         unsigned int    inputdatalength;
1006         compat_uptr_t   outputdata;
1007         unsigned int    outputdatalength;
1008         compat_uptr_t   bp_key;
1009         compat_uptr_t   bq_key;
1010         compat_uptr_t   np_prime;
1011         compat_uptr_t   nq_prime;
1012         compat_uptr_t   u_mult_inv;
1013 };
1014
1015 static long trans_modexpo_crt32(struct file *filp, unsigned int cmd,
1016                                 unsigned long arg)
1017 {
1018         struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg);
1019         struct compat_ica_rsa_modexpo_crt crt32;
1020         struct ica_rsa_modexpo_crt crt64;
1021         long rc;
1022
1023         if (copy_from_user(&crt32, ucrt32, sizeof(crt32)))
1024                 return -EFAULT;
1025         crt64.inputdata = compat_ptr(crt32.inputdata);
1026         crt64.inputdatalength = crt32.inputdatalength;
1027         crt64.outputdata=  compat_ptr(crt32.outputdata);
1028         crt64.outputdatalength = crt32.outputdatalength;
1029         crt64.bp_key = compat_ptr(crt32.bp_key);
1030         crt64.bq_key = compat_ptr(crt32.bq_key);
1031         crt64.np_prime = compat_ptr(crt32.np_prime);
1032         crt64.nq_prime = compat_ptr(crt32.nq_prime);
1033         crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv);
1034         do {
1035                 rc = zcrypt_rsa_crt(&crt64);
1036         } while (rc == -EAGAIN);
1037         /* on failure: retry once again after a requested rescan */
1038         if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1039                 do {
1040                         rc = zcrypt_rsa_crt(&crt64);
1041                 } while (rc == -EAGAIN);
1042         if (rc)
1043                 return rc;
1044         return put_user(crt64.outputdatalength,
1045                         &ucrt32->outputdatalength);
1046 }
1047
1048 struct compat_ica_xcRB {
1049         unsigned short  agent_ID;
1050         unsigned int    user_defined;
1051         unsigned short  request_ID;
1052         unsigned int    request_control_blk_length;
1053         unsigned char   padding1[16 - sizeof (compat_uptr_t)];
1054         compat_uptr_t   request_control_blk_addr;
1055         unsigned int    request_data_length;
1056         char            padding2[16 - sizeof (compat_uptr_t)];
1057         compat_uptr_t   request_data_address;
1058         unsigned int    reply_control_blk_length;
1059         char            padding3[16 - sizeof (compat_uptr_t)];
1060         compat_uptr_t   reply_control_blk_addr;
1061         unsigned int    reply_data_length;
1062         char            padding4[16 - sizeof (compat_uptr_t)];
1063         compat_uptr_t   reply_data_addr;
1064         unsigned short  priority_window;
1065         unsigned int    status;
1066 } __attribute__((packed));
1067
1068 static long trans_xcRB32(struct file *filp, unsigned int cmd,
1069                          unsigned long arg)
1070 {
1071         struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg);
1072         struct compat_ica_xcRB xcRB32;
1073         struct ica_xcRB xcRB64;
1074         long rc;
1075
1076         if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32)))
1077                 return -EFAULT;
1078         xcRB64.agent_ID = xcRB32.agent_ID;
1079         xcRB64.user_defined = xcRB32.user_defined;
1080         xcRB64.request_ID = xcRB32.request_ID;
1081         xcRB64.request_control_blk_length =
1082                 xcRB32.request_control_blk_length;
1083         xcRB64.request_control_blk_addr =
1084                 compat_ptr(xcRB32.request_control_blk_addr);
1085         xcRB64.request_data_length =
1086                 xcRB32.request_data_length;
1087         xcRB64.request_data_address =
1088                 compat_ptr(xcRB32.request_data_address);
1089         xcRB64.reply_control_blk_length =
1090                 xcRB32.reply_control_blk_length;
1091         xcRB64.reply_control_blk_addr =
1092                 compat_ptr(xcRB32.reply_control_blk_addr);
1093         xcRB64.reply_data_length = xcRB32.reply_data_length;
1094         xcRB64.reply_data_addr =
1095                 compat_ptr(xcRB32.reply_data_addr);
1096         xcRB64.priority_window = xcRB32.priority_window;
1097         xcRB64.status = xcRB32.status;
1098         do {
1099                 rc = zcrypt_send_cprb(&xcRB64);
1100         } while (rc == -EAGAIN);
1101         /* on failure: retry once again after a requested rescan */
1102         if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1103                 do {
1104                         rc = zcrypt_send_cprb(&xcRB64);
1105                 } while (rc == -EAGAIN);
1106         xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length;
1107         xcRB32.reply_data_length = xcRB64.reply_data_length;
1108         xcRB32.status = xcRB64.status;
1109         if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32)))
1110                         return -EFAULT;
1111         return rc;
1112 }
1113
1114 static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd,
1115                          unsigned long arg)
1116 {
1117         if (cmd == ICARSAMODEXPO)
1118                 return trans_modexpo32(filp, cmd, arg);
1119         if (cmd == ICARSACRT)
1120                 return trans_modexpo_crt32(filp, cmd, arg);
1121         if (cmd == ZSECSENDCPRB)
1122                 return trans_xcRB32(filp, cmd, arg);
1123         return zcrypt_unlocked_ioctl(filp, cmd, arg);
1124 }
1125 #endif
1126
1127 /*
1128  * Misc device file operations.
1129  */
1130 static const struct file_operations zcrypt_fops = {
1131         .owner          = THIS_MODULE,
1132         .read           = zcrypt_read,
1133         .write          = zcrypt_write,
1134         .unlocked_ioctl = zcrypt_unlocked_ioctl,
1135 #ifdef CONFIG_COMPAT
1136         .compat_ioctl   = zcrypt_compat_ioctl,
1137 #endif
1138         .open           = zcrypt_open,
1139         .release        = zcrypt_release,
1140         .llseek         = no_llseek,
1141 };
1142
1143 /*
1144  * Misc device.
1145  */
1146 static struct miscdevice zcrypt_misc_device = {
1147         .minor      = MISC_DYNAMIC_MINOR,
1148         .name       = "z90crypt",
1149         .fops       = &zcrypt_fops,
1150 };
1151
1152 /*
1153  * Deprecated /proc entry support.
1154  */
1155 static struct proc_dir_entry *zcrypt_entry;
1156
1157 static void sprintcl(struct seq_file *m, unsigned char *addr, unsigned int len)
1158 {
1159         int i;
1160
1161         for (i = 0; i < len; i++)
1162                 seq_printf(m, "%01x", (unsigned int) addr[i]);
1163         seq_putc(m, ' ');
1164 }
1165
1166 static void sprintrw(struct seq_file *m, unsigned char *addr, unsigned int len)
1167 {
1168         int inl, c, cx;
1169
1170         seq_printf(m, "    ");
1171         inl = 0;
1172         for (c = 0; c < (len / 16); c++) {
1173                 sprintcl(m, addr+inl, 16);
1174                 inl += 16;
1175         }
1176         cx = len%16;
1177         if (cx) {
1178                 sprintcl(m, addr+inl, cx);
1179                 inl += cx;
1180         }
1181         seq_putc(m, '\n');
1182 }
1183
1184 static void sprinthx(unsigned char *title, struct seq_file *m,
1185                      unsigned char *addr, unsigned int len)
1186 {
1187         int inl, r, rx;
1188
1189         seq_printf(m, "\n%s\n", title);
1190         inl = 0;
1191         for (r = 0; r < (len / 64); r++) {
1192                 sprintrw(m, addr+inl, 64);
1193                 inl += 64;
1194         }
1195         rx = len % 64;
1196         if (rx) {
1197                 sprintrw(m, addr+inl, rx);
1198                 inl += rx;
1199         }
1200         seq_putc(m, '\n');
1201 }
1202
1203 static void sprinthx4(unsigned char *title, struct seq_file *m,
1204                       unsigned int *array, unsigned int len)
1205 {
1206         seq_printf(m, "\n%s\n", title);
1207         seq_hex_dump(m, "    ", DUMP_PREFIX_NONE, 32, 4, array, len, false);
1208         seq_putc(m, '\n');
1209 }
1210
1211 static int zcrypt_proc_show(struct seq_file *m, void *v)
1212 {
1213         char workarea[sizeof(int) * AP_DEVICES];
1214
1215         seq_printf(m, "\nzcrypt version: %d.%d.%d\n",
1216                    ZCRYPT_VERSION, ZCRYPT_RELEASE, ZCRYPT_VARIANT);
1217         seq_printf(m, "Cryptographic domain: %d\n", ap_domain_index);
1218         seq_printf(m, "Total device count: %d\n", zcrypt_device_count);
1219         seq_printf(m, "PCICA count: %d\n", zcrypt_count_type(ZCRYPT_PCICA));
1220         seq_printf(m, "PCICC count: %d\n", zcrypt_count_type(ZCRYPT_PCICC));
1221         seq_printf(m, "PCIXCC MCL2 count: %d\n",
1222                    zcrypt_count_type(ZCRYPT_PCIXCC_MCL2));
1223         seq_printf(m, "PCIXCC MCL3 count: %d\n",
1224                    zcrypt_count_type(ZCRYPT_PCIXCC_MCL3));
1225         seq_printf(m, "CEX2C count: %d\n", zcrypt_count_type(ZCRYPT_CEX2C));
1226         seq_printf(m, "CEX2A count: %d\n", zcrypt_count_type(ZCRYPT_CEX2A));
1227         seq_printf(m, "CEX3C count: %d\n", zcrypt_count_type(ZCRYPT_CEX3C));
1228         seq_printf(m, "CEX3A count: %d\n", zcrypt_count_type(ZCRYPT_CEX3A));
1229         seq_printf(m, "requestq count: %d\n", zcrypt_requestq_count());
1230         seq_printf(m, "pendingq count: %d\n", zcrypt_pendingq_count());
1231         seq_printf(m, "Total open handles: %d\n\n",
1232                    atomic_read(&zcrypt_open_count));
1233         zcrypt_status_mask(workarea);
1234         sprinthx("Online devices: 1=PCICA 2=PCICC 3=PCIXCC(MCL2) "
1235                  "4=PCIXCC(MCL3) 5=CEX2C 6=CEX2A 7=CEX3C 8=CEX3A",
1236                  m, workarea, AP_DEVICES);
1237         zcrypt_qdepth_mask(workarea);
1238         sprinthx("Waiting work element counts", m, workarea, AP_DEVICES);
1239         zcrypt_perdev_reqcnt((int *) workarea);
1240         sprinthx4("Per-device successfully completed request counts",
1241                   m, (unsigned int *) workarea, AP_DEVICES);
1242         return 0;
1243 }
1244
1245 static int zcrypt_proc_open(struct inode *inode, struct file *file)
1246 {
1247         return single_open(file, zcrypt_proc_show, NULL);
1248 }
1249
1250 static void zcrypt_disable_card(int index)
1251 {
1252         struct zcrypt_device *zdev;
1253
1254         spin_lock_bh(&zcrypt_device_lock);
1255         list_for_each_entry(zdev, &zcrypt_device_list, list)
1256                 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
1257                         zdev->online = 0;
1258                         ap_flush_queue(zdev->ap_dev);
1259                         break;
1260                 }
1261         spin_unlock_bh(&zcrypt_device_lock);
1262 }
1263
1264 static void zcrypt_enable_card(int index)
1265 {
1266         struct zcrypt_device *zdev;
1267
1268         spin_lock_bh(&zcrypt_device_lock);
1269         list_for_each_entry(zdev, &zcrypt_device_list, list)
1270                 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
1271                         zdev->online = 1;
1272                         break;
1273                 }
1274         spin_unlock_bh(&zcrypt_device_lock);
1275 }
1276
1277 static ssize_t zcrypt_proc_write(struct file *file, const char __user *buffer,
1278                                  size_t count, loff_t *pos)
1279 {
1280         unsigned char *lbuf, *ptr;
1281         size_t local_count;
1282         int j;
1283
1284         if (count <= 0)
1285                 return 0;
1286
1287 #define LBUFSIZE 1200UL
1288         lbuf = kmalloc(LBUFSIZE, GFP_KERNEL);
1289         if (!lbuf)
1290                 return 0;
1291
1292         local_count = min(LBUFSIZE - 1, count);
1293         if (copy_from_user(lbuf, buffer, local_count) != 0) {
1294                 kfree(lbuf);
1295                 return -EFAULT;
1296         }
1297         lbuf[local_count] = '\0';
1298
1299         ptr = strstr(lbuf, "Online devices");
1300         if (!ptr)
1301                 goto out;
1302         ptr = strstr(ptr, "\n");
1303         if (!ptr)
1304                 goto out;
1305         ptr++;
1306
1307         if (strstr(ptr, "Waiting work element counts") == NULL)
1308                 goto out;
1309
1310         for (j = 0; j < 64 && *ptr; ptr++) {
1311                 /*
1312                  * '0' for no device, '1' for PCICA, '2' for PCICC,
1313                  * '3' for PCIXCC_MCL2, '4' for PCIXCC_MCL3,
1314                  * '5' for CEX2C and '6' for CEX2A'
1315                  * '7' for CEX3C and '8' for CEX3A
1316                  */
1317                 if (*ptr >= '0' && *ptr <= '8')
1318                         j++;
1319                 else if (*ptr == 'd' || *ptr == 'D')
1320                         zcrypt_disable_card(j++);
1321                 else if (*ptr == 'e' || *ptr == 'E')
1322                         zcrypt_enable_card(j++);
1323                 else if (*ptr != ' ' && *ptr != '\t')
1324                         break;
1325         }
1326 out:
1327         kfree(lbuf);
1328         return count;
1329 }
1330
1331 static const struct file_operations zcrypt_proc_fops = {
1332         .owner          = THIS_MODULE,
1333         .open           = zcrypt_proc_open,
1334         .read           = seq_read,
1335         .llseek         = seq_lseek,
1336         .release        = single_release,
1337         .write          = zcrypt_proc_write,
1338 };
1339
1340 static int zcrypt_rng_device_count;
1341 static u32 *zcrypt_rng_buffer;
1342 static int zcrypt_rng_buffer_index;
1343 static DEFINE_MUTEX(zcrypt_rng_mutex);
1344
1345 static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
1346 {
1347         int rc;
1348
1349         /*
1350          * We don't need locking here because the RNG API guarantees serialized
1351          * read method calls.
1352          */
1353         if (zcrypt_rng_buffer_index == 0) {
1354                 rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1355                 /* on failure: retry once again after a requested rescan */
1356                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1357                         rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1358                 if (rc < 0)
1359                         return -EIO;
1360                 zcrypt_rng_buffer_index = rc / sizeof *data;
1361         }
1362         *data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index];
1363         return sizeof *data;
1364 }
1365
1366 static struct hwrng zcrypt_rng_dev = {
1367         .name           = "zcrypt",
1368         .data_read      = zcrypt_rng_data_read,
1369         .quality        = 990,
1370 };
1371
1372 static int zcrypt_rng_device_add(void)
1373 {
1374         int rc = 0;
1375
1376         mutex_lock(&zcrypt_rng_mutex);
1377         if (zcrypt_rng_device_count == 0) {
1378                 zcrypt_rng_buffer = (u32 *) get_zeroed_page(GFP_KERNEL);
1379                 if (!zcrypt_rng_buffer) {
1380                         rc = -ENOMEM;
1381                         goto out;
1382                 }
1383                 zcrypt_rng_buffer_index = 0;
1384                 if (!zcrypt_hwrng_seed)
1385                         zcrypt_rng_dev.quality = 0;
1386                 rc = hwrng_register(&zcrypt_rng_dev);
1387                 if (rc)
1388                         goto out_free;
1389                 zcrypt_rng_device_count = 1;
1390         } else
1391                 zcrypt_rng_device_count++;
1392         mutex_unlock(&zcrypt_rng_mutex);
1393         return 0;
1394
1395 out_free:
1396         free_page((unsigned long) zcrypt_rng_buffer);
1397 out:
1398         mutex_unlock(&zcrypt_rng_mutex);
1399         return rc;
1400 }
1401
1402 static void zcrypt_rng_device_remove(void)
1403 {
1404         mutex_lock(&zcrypt_rng_mutex);
1405         zcrypt_rng_device_count--;
1406         if (zcrypt_rng_device_count == 0) {
1407                 hwrng_unregister(&zcrypt_rng_dev);
1408                 free_page((unsigned long) zcrypt_rng_buffer);
1409         }
1410         mutex_unlock(&zcrypt_rng_mutex);
1411 }
1412
1413 int __init zcrypt_debug_init(void)
1414 {
1415         debugfs_root = debugfs_create_dir("zcrypt", NULL);
1416
1417         zcrypt_dbf_common = debug_register("zcrypt_common", 1, 1, 16);
1418         debug_register_view(zcrypt_dbf_common, &debug_hex_ascii_view);
1419         debug_set_level(zcrypt_dbf_common, DBF_ERR);
1420
1421         zcrypt_dbf_devices = debug_register("zcrypt_devices", 1, 1, 16);
1422         debug_register_view(zcrypt_dbf_devices, &debug_hex_ascii_view);
1423         debug_set_level(zcrypt_dbf_devices, DBF_ERR);
1424
1425         return 0;
1426 }
1427
1428 void zcrypt_debug_exit(void)
1429 {
1430         debugfs_remove(debugfs_root);
1431         if (zcrypt_dbf_common)
1432                 debug_unregister(zcrypt_dbf_common);
1433         if (zcrypt_dbf_devices)
1434                 debug_unregister(zcrypt_dbf_devices);
1435 }
1436
1437 /**
1438  * zcrypt_api_init(): Module initialization.
1439  *
1440  * The module initialization code.
1441  */
1442 int __init zcrypt_api_init(void)
1443 {
1444         int rc;
1445
1446         rc = zcrypt_debug_init();
1447         if (rc)
1448                 goto out;
1449
1450         atomic_set(&zcrypt_rescan_req, 0);
1451
1452         /* Register the request sprayer. */
1453         rc = misc_register(&zcrypt_misc_device);
1454         if (rc < 0)
1455                 goto out;
1456
1457         /* Set up the proc file system */
1458         zcrypt_entry = proc_create("driver/z90crypt", 0644, NULL, &zcrypt_proc_fops);
1459         if (!zcrypt_entry) {
1460                 rc = -ENOMEM;
1461                 goto out_misc;
1462         }
1463
1464         return 0;
1465
1466 out_misc:
1467         misc_deregister(&zcrypt_misc_device);
1468 out:
1469         return rc;
1470 }
1471
1472 /**
1473  * zcrypt_api_exit(): Module termination.
1474  *
1475  * The module termination code.
1476  */
1477 void zcrypt_api_exit(void)
1478 {
1479         remove_proc_entry("driver/z90crypt", NULL);
1480         misc_deregister(&zcrypt_misc_device);
1481         zcrypt_debug_exit();
1482 }
1483
1484 module_init(zcrypt_api_init);
1485 module_exit(zcrypt_api_exit);