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 DEFINE_SPINLOCK(zcrypt_device_lock);
  58 static LIST_HEAD(zcrypt_device_list);
  59 static int zcrypt_device_count = 0;
  60 static atomic_t zcrypt_open_count = ATOMIC_INIT(0);
  61 static atomic_t zcrypt_rescan_count = ATOMIC_INIT(0);
  62
  63 atomic_t zcrypt_rescan_req = ATOMIC_INIT(0);
  64 EXPORT_SYMBOL(zcrypt_rescan_req);
  65
  66 static int zcrypt_rng_device_add(void);
  67 static void zcrypt_rng_device_remove(void);
  68
  69 static DEFINE_SPINLOCK(zcrypt_ops_list_lock);
  70 static LIST_HEAD(zcrypt_ops_list);
  71
  72 static debug_info_t *zcrypt_dbf_common;
  73 static debug_info_t *zcrypt_dbf_devices;
  74 static struct dentry *debugfs_root;
  75
  76 /*
  77  * Device attributes common for all crypto devices.
  78  */
  79 static ssize_t zcrypt_type_show(struct device *dev,
  80                                 struct device_attribute *attr, char *buf)
  81 {
  82         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
  83         return snprintf(buf, PAGE_SIZE, "%s\n", zdev->type_string);
  84 }
  85
  86 static DEVICE_ATTR(type, 0444, zcrypt_type_show, NULL);
  87
  88 static ssize_t zcrypt_online_show(struct device *dev,
  89                                   struct device_attribute *attr, char *buf)
  90 {
  91         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
  92         return snprintf(buf, PAGE_SIZE, "%d\n", zdev->online);
  93 }
  94
  95 static ssize_t zcrypt_online_store(struct device *dev,
  96                                    struct device_attribute *attr,
  97                                    const char *buf, size_t count)
  98 {
  99         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
 100         int online;
 101
 102         if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
 103                 return -EINVAL;
 104         zdev->online = online;
 105         ZCRYPT_DBF_DEV(DBF_INFO, zdev, "dev%04xo%dman", zdev->ap_dev->qid,
 106                        zdev->online);
 107         if (!online)
 108                 ap_flush_queue(zdev->ap_dev);
 109         return count;
 110 }
 111
 112 static DEVICE_ATTR(online, 0644, zcrypt_online_show, zcrypt_online_store);
 113
 114 static struct attribute * zcrypt_device_attrs[] = {
 115         &dev_attr_type.attr,
 116         &dev_attr_online.attr,
 117         NULL,
 118 };
 119
 120 static struct attribute_group zcrypt_device_attr_group = {
 121         .attrs = zcrypt_device_attrs,
 122 };
 123
 124 /**
 125  * Process a rescan of the transport layer.
 126  *
 127  * Returns 1, if the rescan has been processed, otherwise 0.
 128  */
 129 static inline int zcrypt_process_rescan(void)
 130 {
 131         if (atomic_read(&zcrypt_rescan_req)) {
 132                 atomic_set(&zcrypt_rescan_req, 0);
 133                 atomic_inc(&zcrypt_rescan_count);
 134                 ap_bus_force_rescan();
 135                 ZCRYPT_DBF_COMMON(DBF_INFO, "rescan%07d",
 136                                   atomic_inc_return(&zcrypt_rescan_count));
 137                 return 1;
 138         }
 139         return 0;
 140 }
 141
 142 /**
 143  * __zcrypt_increase_preference(): Increase preference of a crypto device.
 144  * @zdev: Pointer the crypto device
 145  *
 146  * Move the device towards the head of the device list.
 147  * Need to be called while holding the zcrypt device list lock.
 148  * Note: cards with speed_rating of 0 are kept at the end of the list.
 149  */
 150 static void __zcrypt_increase_preference(struct zcrypt_device *zdev)
 151 {
 152         struct zcrypt_device *tmp;
 153         struct list_head *l;
 154
 155         if (zdev->speed_rating == 0)
 156                 return;
 157         for (l = zdev->list.prev; l != &zcrypt_device_list; l = l->prev) {
 158                 tmp = list_entry(l, struct zcrypt_device, list);
 159                 if ((tmp->request_count + 1) * tmp->speed_rating <=
 160                     (zdev->request_count + 1) * zdev->speed_rating &&
 161                     tmp->speed_rating != 0)
 162                         break;
 163         }
 164         if (l == zdev->list.prev)
 165                 return;
 166         /* Move zdev behind l */
 167         list_move(&zdev->list, l);
 168 }
 169
 170 /**
 171  * __zcrypt_decrease_preference(): Decrease preference of a crypto device.
 172  * @zdev: Pointer to a crypto device.
 173  *
 174  * Move the device towards the tail of the device list.
 175  * Need to be called while holding the zcrypt device list lock.
 176  * Note: cards with speed_rating of 0 are kept at the end of the list.
 177  */
 178 static void __zcrypt_decrease_preference(struct zcrypt_device *zdev)
 179 {
 180         struct zcrypt_device *tmp;
 181         struct list_head *l;
 182
 183         if (zdev->speed_rating == 0)
 184                 return;
 185         for (l = zdev->list.next; l != &zcrypt_device_list; l = l->next) {
 186                 tmp = list_entry(l, struct zcrypt_device, list);
 187                 if ((tmp->request_count + 1) * tmp->speed_rating >
 188                     (zdev->request_count + 1) * zdev->speed_rating ||
 189                     tmp->speed_rating == 0)
 190                         break;
 191         }
 192         if (l == zdev->list.next)
 193                 return;
 194         /* Move zdev before l */
 195         list_move_tail(&zdev->list, l);
 196 }
 197
 198 static void zcrypt_device_release(struct kref *kref)
 199 {
 200         struct zcrypt_device *zdev =
 201                 container_of(kref, struct zcrypt_device, refcount);
 202         zcrypt_device_free(zdev);
 203 }
 204
 205 void zcrypt_device_get(struct zcrypt_device *zdev)
 206 {
 207         kref_get(&zdev->refcount);
 208 }
 209 EXPORT_SYMBOL(zcrypt_device_get);
 210
 211 int zcrypt_device_put(struct zcrypt_device *zdev)
 212 {
 213         return kref_put(&zdev->refcount, zcrypt_device_release);
 214 }
 215 EXPORT_SYMBOL(zcrypt_device_put);
 216
 217 struct zcrypt_device *zcrypt_device_alloc(size_t max_response_size)
 218 {
 219         struct zcrypt_device *zdev;
 220
 221         zdev = kzalloc(sizeof(struct zcrypt_device), GFP_KERNEL);
 222         if (!zdev)
 223                 return NULL;
 224         zdev->reply.message = kmalloc(max_response_size, GFP_KERNEL);
 225         if (!zdev->reply.message)
 226                 goto out_free;
 227         zdev->reply.length = max_response_size;
 228         spin_lock_init(&zdev->lock);
 229         INIT_LIST_HEAD(&zdev->list);
 230         zdev->dbf_area = zcrypt_dbf_devices;
 231         return zdev;
 232
 233 out_free:
 234         kfree(zdev);
 235         return NULL;
 236 }
 237 EXPORT_SYMBOL(zcrypt_device_alloc);
 238
 239 void zcrypt_device_free(struct zcrypt_device *zdev)
 240 {
 241         kfree(zdev->reply.message);
 242         kfree(zdev);
 243 }
 244 EXPORT_SYMBOL(zcrypt_device_free);
 245
 246 /**
 247  * zcrypt_device_register() - Register a crypto device.
 248  * @zdev: Pointer to a crypto device
 249  *
 250  * Register a crypto device. Returns 0 if successful.
 251  */
 252 int zcrypt_device_register(struct zcrypt_device *zdev)
 253 {
 254         int rc;
 255
 256         if (!zdev->ops)
 257                 return -ENODEV;
 258         rc = sysfs_create_group(&zdev->ap_dev->device.kobj,
 259                                 &zcrypt_device_attr_group);
 260         if (rc)
 261                 goto out;
 262         get_device(&zdev->ap_dev->device);
 263         kref_init(&zdev->refcount);
 264         spin_lock_bh(&zcrypt_device_lock);
 265         zdev->online = 1;       /* New devices are online by default. */
 266         ZCRYPT_DBF_DEV(DBF_INFO, zdev, "dev%04xo%dreg", zdev->ap_dev->qid,
 267                        zdev->online);
 268         list_add_tail(&zdev->list, &zcrypt_device_list);
 269         __zcrypt_increase_preference(zdev);
 270         zcrypt_device_count++;
 271         spin_unlock_bh(&zcrypt_device_lock);
 272         if (zdev->ops->rng) {
 273                 rc = zcrypt_rng_device_add();
 274                 if (rc)
 275                         goto out_unregister;
 276         }
 277         return 0;
 278
 279 out_unregister:
 280         spin_lock_bh(&zcrypt_device_lock);
 281         zcrypt_device_count--;
 282         list_del_init(&zdev->list);
 283         spin_unlock_bh(&zcrypt_device_lock);
 284         sysfs_remove_group(&zdev->ap_dev->device.kobj,
 285                            &zcrypt_device_attr_group);
 286         put_device(&zdev->ap_dev->device);
 287         zcrypt_device_put(zdev);
 288 out:
 289         return rc;
 290 }
 291 EXPORT_SYMBOL(zcrypt_device_register);
 292
 293 /**
 294  * zcrypt_device_unregister(): Unregister a crypto device.
 295  * @zdev: Pointer to crypto device
 296  *
 297  * Unregister a crypto device.
 298  */
 299 void zcrypt_device_unregister(struct zcrypt_device *zdev)
 300 {
 301         if (zdev->ops->rng)
 302                 zcrypt_rng_device_remove();
 303         spin_lock_bh(&zcrypt_device_lock);
 304         zcrypt_device_count--;
 305         list_del_init(&zdev->list);
 306         spin_unlock_bh(&zcrypt_device_lock);
 307         sysfs_remove_group(&zdev->ap_dev->device.kobj,
 308                            &zcrypt_device_attr_group);
 309         put_device(&zdev->ap_dev->device);
 310         zcrypt_device_put(zdev);
 311 }
 312 EXPORT_SYMBOL(zcrypt_device_unregister);
 313
 314 void zcrypt_msgtype_register(struct zcrypt_ops *zops)
 315 {
 316         if (zops->owner) {
 317                 spin_lock_bh(&zcrypt_ops_list_lock);
 318                 list_add_tail(&zops->list, &zcrypt_ops_list);
 319                 spin_unlock_bh(&zcrypt_ops_list_lock);
 320         }
 321 }
 322 EXPORT_SYMBOL(zcrypt_msgtype_register);
 323
 324 void zcrypt_msgtype_unregister(struct zcrypt_ops *zops)
 325 {
 326         spin_lock_bh(&zcrypt_ops_list_lock);
 327         list_del_init(&zops->list);
 328         spin_unlock_bh(&zcrypt_ops_list_lock);
 329 }
 330 EXPORT_SYMBOL(zcrypt_msgtype_unregister);
 331
 332 static inline
 333 struct zcrypt_ops *__ops_lookup(unsigned char *name, int variant)
 334 {
 335         struct zcrypt_ops *zops;
 336         int found = 0;
 337
 338         spin_lock_bh(&zcrypt_ops_list_lock);
 339         list_for_each_entry(zops, &zcrypt_ops_list, list) {
 340                 if ((zops->variant == variant) &&
 341                     (!strncmp(zops->owner->name, name, MODULE_NAME_LEN))) {
 342                         found = 1;
 343                         break;
 344                 }
 345         }
 346         if (!found || !try_module_get(zops->owner))
 347                 zops = NULL;
 348
 349         spin_unlock_bh(&zcrypt_ops_list_lock);
 350
 351         return zops;
 352 }
 353
 354 struct zcrypt_ops *zcrypt_msgtype_request(unsigned char *name, int variant)
 355 {
 356         struct zcrypt_ops *zops = NULL;
 357
 358         zops = __ops_lookup(name, variant);
 359         if (!zops) {
 360                 request_module("%s", name);
 361                 zops = __ops_lookup(name, variant);
 362         }
 363         return zops;
 364 }
 365 EXPORT_SYMBOL(zcrypt_msgtype_request);
 366
 367 void zcrypt_msgtype_release(struct zcrypt_ops *zops)
 368 {
 369         if (zops)
 370                 module_put(zops->owner);
 371 }
 372 EXPORT_SYMBOL(zcrypt_msgtype_release);
 373
 374 /**
 375  * zcrypt_read (): Not supported beyond zcrypt 1.3.1.
 376  *
 377  * This function is not supported beyond zcrypt 1.3.1.
 378  */
 379 static ssize_t zcrypt_read(struct file *filp, char __user *buf,
 380                            size_t count, loff_t *f_pos)
 381 {
 382         return -EPERM;
 383 }
 384
 385 /**
 386  * zcrypt_write(): Not allowed.
 387  *
 388  * Write is is not allowed
 389  */
 390 static ssize_t zcrypt_write(struct file *filp, const char __user *buf,
 391                             size_t count, loff_t *f_pos)
 392 {
 393         return -EPERM;
 394 }
 395
 396 /**
 397  * zcrypt_open(): Count number of users.
 398  *
 399  * Device open function to count number of users.
 400  */
 401 static int zcrypt_open(struct inode *inode, struct file *filp)
 402 {
 403         atomic_inc(&zcrypt_open_count);
 404         return nonseekable_open(inode, filp);
 405 }
 406
 407 /**
 408  * zcrypt_release(): Count number of users.
 409  *
 410  * Device close function to count number of users.
 411  */
 412 static int zcrypt_release(struct inode *inode, struct file *filp)
 413 {
 414         atomic_dec(&zcrypt_open_count);
 415         return 0;
 416 }
 417
 418 /*
 419  * zcrypt ioctls.
 420  */
 421 static long zcrypt_rsa_modexpo(struct ica_rsa_modexpo *mex)
 422 {
 423         struct zcrypt_device *zdev;
 424         int rc;
 425
 426         if (mex->outputdatalength < mex->inputdatalength)
 427                 return -EINVAL;
 428         /*
 429          * As long as outputdatalength is big enough, we can set the
 430          * outputdatalength equal to the inputdatalength, since that is the
 431          * number of bytes we will copy in any case
 432          */
 433         mex->outputdatalength = mex->inputdatalength;
 434
 435         spin_lock_bh(&zcrypt_device_lock);
 436         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 437                 if (!zdev->online ||
 438                     !zdev->ops->rsa_modexpo ||
 439                     zdev->min_mod_size > mex->inputdatalength ||
 440                     zdev->max_mod_size < mex->inputdatalength)
 441                         continue;
 442                 zcrypt_device_get(zdev);
 443                 get_device(&zdev->ap_dev->device);
 444                 zdev->request_count++;
 445                 __zcrypt_decrease_preference(zdev);
 446                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 447                         spin_unlock_bh(&zcrypt_device_lock);
 448                         rc = zdev->ops->rsa_modexpo(zdev, mex);
 449                         spin_lock_bh(&zcrypt_device_lock);
 450                         module_put(zdev->ap_dev->drv->driver.owner);
 451                 }
 452                 else
 453                         rc = -EAGAIN;
 454                 zdev->request_count--;
 455                 __zcrypt_increase_preference(zdev);
 456                 put_device(&zdev->ap_dev->device);
 457                 zcrypt_device_put(zdev);
 458                 spin_unlock_bh(&zcrypt_device_lock);
 459                 return rc;
 460         }
 461         spin_unlock_bh(&zcrypt_device_lock);
 462         return -ENODEV;
 463 }
 464
 465 static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt)
 466 {
 467         struct zcrypt_device *zdev;
 468         unsigned long long z1, z2, z3;
 469         int rc, copied;
 470
 471         if (crt->outputdatalength < crt->inputdatalength ||
 472             (crt->inputdatalength & 1))
 473                 return -EINVAL;
 474         /*
 475          * As long as outputdatalength is big enough, we can set the
 476          * outputdatalength equal to the inputdatalength, since that is the
 477          * number of bytes we will copy in any case
 478          */
 479         crt->outputdatalength = crt->inputdatalength;
 480
 481         copied = 0;
 482  restart:
 483         spin_lock_bh(&zcrypt_device_lock);
 484         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 485                 if (!zdev->online ||
 486                     !zdev->ops->rsa_modexpo_crt ||
 487                     zdev->min_mod_size > crt->inputdatalength ||
 488                     zdev->max_mod_size < crt->inputdatalength)
 489                         continue;
 490                 if (zdev->short_crt && crt->inputdatalength > 240) {
 491                         /*
 492                          * Check inputdata for leading zeros for cards
 493                          * that can't handle np_prime, bp_key, or
 494                          * u_mult_inv > 128 bytes.
 495                          */
 496                         if (copied == 0) {
 497                                 unsigned int len;
 498                                 spin_unlock_bh(&zcrypt_device_lock);
 499                                 /* len is max 256 / 2 - 120 = 8
 500                                  * For bigger device just assume len of leading
 501                                  * 0s is 8 as stated in the requirements for
 502                                  * ica_rsa_modexpo_crt struct in zcrypt.h.
 503                                  */
 504                                 if (crt->inputdatalength <= 256)
 505                                         len = crt->inputdatalength / 2 - 120;
 506                                 else
 507                                         len = 8;
 508                                 if (len > sizeof(z1))
 509                                         return -EFAULT;
 510                                 z1 = z2 = z3 = 0;
 511                                 if (copy_from_user(&z1, crt->np_prime, len) ||
 512                                     copy_from_user(&z2, crt->bp_key, len) ||
 513                                     copy_from_user(&z3, crt->u_mult_inv, len))
 514                                         return -EFAULT;
 515                                 z1 = z2 = z3 = 0;
 516                                 copied = 1;
 517                                 /*
 518                                  * We have to restart device lookup -
 519                                  * the device list may have changed by now.
 520                                  */
 521                                 goto restart;
 522                         }
 523                         if (z1 != 0ULL || z2 != 0ULL || z3 != 0ULL)
 524                                 /* The device can't handle this request. */
 525                                 continue;
 526                 }
 527                 zcrypt_device_get(zdev);
 528                 get_device(&zdev->ap_dev->device);
 529                 zdev->request_count++;
 530                 __zcrypt_decrease_preference(zdev);
 531                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 532                         spin_unlock_bh(&zcrypt_device_lock);
 533                         rc = zdev->ops->rsa_modexpo_crt(zdev, crt);
 534                         spin_lock_bh(&zcrypt_device_lock);
 535                         module_put(zdev->ap_dev->drv->driver.owner);
 536                 }
 537                 else
 538                         rc = -EAGAIN;
 539                 zdev->request_count--;
 540                 __zcrypt_increase_preference(zdev);
 541                 put_device(&zdev->ap_dev->device);
 542                 zcrypt_device_put(zdev);
 543                 spin_unlock_bh(&zcrypt_device_lock);
 544                 return rc;
 545         }
 546         spin_unlock_bh(&zcrypt_device_lock);
 547         return -ENODEV;
 548 }
 549
 550 static long zcrypt_send_cprb(struct ica_xcRB *xcRB)
 551 {
 552         struct zcrypt_device *zdev;
 553         int rc;
 554
 555         spin_lock_bh(&zcrypt_device_lock);
 556         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 557                 if (!zdev->online || !zdev->ops->send_cprb ||
 558                    (zdev->ops->variant == MSGTYPE06_VARIANT_EP11) ||
 559                    (xcRB->user_defined != AUTOSELECT &&
 560                     AP_QID_DEVICE(zdev->ap_dev->qid) != xcRB->user_defined))
 561                         continue;
 562                 zcrypt_device_get(zdev);
 563                 get_device(&zdev->ap_dev->device);
 564                 zdev->request_count++;
 565                 __zcrypt_decrease_preference(zdev);
 566                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 567                         spin_unlock_bh(&zcrypt_device_lock);
 568                         rc = zdev->ops->send_cprb(zdev, xcRB);
 569                         spin_lock_bh(&zcrypt_device_lock);
 570                         module_put(zdev->ap_dev->drv->driver.owner);
 571                 }
 572                 else
 573                         rc = -EAGAIN;
 574                 zdev->request_count--;
 575                 __zcrypt_increase_preference(zdev);
 576                 put_device(&zdev->ap_dev->device);
 577                 zcrypt_device_put(zdev);
 578                 spin_unlock_bh(&zcrypt_device_lock);
 579                 return rc;
 580         }
 581         spin_unlock_bh(&zcrypt_device_lock);
 582         return -ENODEV;
 583 }
 584
 585 struct ep11_target_dev_list {
 586         unsigned short          targets_num;
 587         struct ep11_target_dev  *targets;
 588 };
 589
 590 static bool is_desired_ep11dev(unsigned int dev_qid,
 591                                struct ep11_target_dev_list dev_list)
 592 {
 593         int n;
 594
 595         for (n = 0; n < dev_list.targets_num; n++, dev_list.targets++) {
 596                 if ((AP_QID_DEVICE(dev_qid) == dev_list.targets->ap_id) &&
 597                     (AP_QID_QUEUE(dev_qid) == dev_list.targets->dom_id)) {
 598                         return true;
 599                 }
 600         }
 601         return false;
 602 }
 603
 604 static long zcrypt_send_ep11_cprb(struct ep11_urb *xcrb)
 605 {
 606         struct zcrypt_device *zdev;
 607         bool autoselect = false;
 608         int rc;
 609         struct ep11_target_dev_list ep11_dev_list = {
 610                 .targets_num    =  0x00,
 611                 .targets        =  NULL,
 612         };
 613
 614         ep11_dev_list.targets_num = (unsigned short) xcrb->targets_num;
 615
 616         /* empty list indicates autoselect (all available targets) */
 617         if (ep11_dev_list.targets_num == 0)
 618                 autoselect = true;
 619         else {
 620                 ep11_dev_list.targets = kcalloc((unsigned short)
 621                                                 xcrb->targets_num,
 622                                                 sizeof(struct ep11_target_dev),
 623                                                 GFP_KERNEL);
 624                 if (!ep11_dev_list.targets)
 625                         return -ENOMEM;
 626
 627                 if (copy_from_user(ep11_dev_list.targets,
 628                                    (struct ep11_target_dev __force __user *)
 629                                    xcrb->targets, xcrb->targets_num *
 630                                    sizeof(struct ep11_target_dev)))
 631                         return -EFAULT;
 632         }
 633
 634         spin_lock_bh(&zcrypt_device_lock);
 635         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 636                 /* check if device is eligible */
 637                 if (!zdev->online ||
 638                     zdev->ops->variant != MSGTYPE06_VARIANT_EP11)
 639                         continue;
 640
 641                 /* check if device is selected as valid target */
 642                 if (!is_desired_ep11dev(zdev->ap_dev->qid, ep11_dev_list) &&
 643                     !autoselect)
 644                         continue;
 645
 646                 zcrypt_device_get(zdev);
 647                 get_device(&zdev->ap_dev->device);
 648                 zdev->request_count++;
 649                 __zcrypt_decrease_preference(zdev);
 650                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 651                         spin_unlock_bh(&zcrypt_device_lock);
 652                         rc = zdev->ops->send_ep11_cprb(zdev, xcrb);
 653                         spin_lock_bh(&zcrypt_device_lock);
 654                         module_put(zdev->ap_dev->drv->driver.owner);
 655                 } else {
 656                         rc = -EAGAIN;
 657                   }
 658                 zdev->request_count--;
 659                 __zcrypt_increase_preference(zdev);
 660                 put_device(&zdev->ap_dev->device);
 661                 zcrypt_device_put(zdev);
 662                 spin_unlock_bh(&zcrypt_device_lock);
 663                 return rc;
 664         }
 665         spin_unlock_bh(&zcrypt_device_lock);
 666         return -ENODEV;
 667 }
 668
 669 static long zcrypt_rng(char *buffer)
 670 {
 671         struct zcrypt_device *zdev;
 672         int rc;
 673
 674         spin_lock_bh(&zcrypt_device_lock);
 675         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 676                 if (!zdev->online || !zdev->ops->rng)
 677                         continue;
 678                 zcrypt_device_get(zdev);
 679                 get_device(&zdev->ap_dev->device);
 680                 zdev->request_count++;
 681                 __zcrypt_decrease_preference(zdev);
 682                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
 683                         spin_unlock_bh(&zcrypt_device_lock);
 684                         rc = zdev->ops->rng(zdev, buffer);
 685                         spin_lock_bh(&zcrypt_device_lock);
 686                         module_put(zdev->ap_dev->drv->driver.owner);
 687                 } else
 688                         rc = -EAGAIN;
 689                 zdev->request_count--;
 690                 __zcrypt_increase_preference(zdev);
 691                 put_device(&zdev->ap_dev->device);
 692                 zcrypt_device_put(zdev);
 693                 spin_unlock_bh(&zcrypt_device_lock);
 694                 return rc;
 695         }
 696         spin_unlock_bh(&zcrypt_device_lock);
 697         return -ENODEV;
 698 }
 699
 700 static void zcrypt_status_mask(char status[AP_DEVICES])
 701 {
 702         struct zcrypt_device *zdev;
 703
 704         memset(status, 0, sizeof(char) * AP_DEVICES);
 705         spin_lock_bh(&zcrypt_device_lock);
 706         list_for_each_entry(zdev, &zcrypt_device_list, list)
 707                 status[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 708                         zdev->online ? zdev->user_space_type : 0x0d;
 709         spin_unlock_bh(&zcrypt_device_lock);
 710 }
 711
 712 static void zcrypt_qdepth_mask(char qdepth[AP_DEVICES])
 713 {
 714         struct zcrypt_device *zdev;
 715
 716         memset(qdepth, 0, sizeof(char)  * AP_DEVICES);
 717         spin_lock_bh(&zcrypt_device_lock);
 718         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 719                 spin_lock(&zdev->ap_dev->lock);
 720                 qdepth[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 721                         zdev->ap_dev->pendingq_count +
 722                         zdev->ap_dev->requestq_count;
 723                 spin_unlock(&zdev->ap_dev->lock);
 724         }
 725         spin_unlock_bh(&zcrypt_device_lock);
 726 }
 727
 728 static void zcrypt_perdev_reqcnt(int reqcnt[AP_DEVICES])
 729 {
 730         struct zcrypt_device *zdev;
 731
 732         memset(reqcnt, 0, sizeof(int) * AP_DEVICES);
 733         spin_lock_bh(&zcrypt_device_lock);
 734         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 735                 spin_lock(&zdev->ap_dev->lock);
 736                 reqcnt[AP_QID_DEVICE(zdev->ap_dev->qid)] =
 737                         zdev->ap_dev->total_request_count;
 738                 spin_unlock(&zdev->ap_dev->lock);
 739         }
 740         spin_unlock_bh(&zcrypt_device_lock);
 741 }
 742
 743 static int zcrypt_pendingq_count(void)
 744 {
 745         struct zcrypt_device *zdev;
 746         int pendingq_count = 0;
 747
 748         spin_lock_bh(&zcrypt_device_lock);
 749         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 750                 spin_lock(&zdev->ap_dev->lock);
 751                 pendingq_count += zdev->ap_dev->pendingq_count;
 752                 spin_unlock(&zdev->ap_dev->lock);
 753         }
 754         spin_unlock_bh(&zcrypt_device_lock);
 755         return pendingq_count;
 756 }
 757
 758 static int zcrypt_requestq_count(void)
 759 {
 760         struct zcrypt_device *zdev;
 761         int requestq_count = 0;
 762
 763         spin_lock_bh(&zcrypt_device_lock);
 764         list_for_each_entry(zdev, &zcrypt_device_list, list) {
 765                 spin_lock(&zdev->ap_dev->lock);
 766                 requestq_count += zdev->ap_dev->requestq_count;
 767                 spin_unlock(&zdev->ap_dev->lock);
 768         }
 769         spin_unlock_bh(&zcrypt_device_lock);
 770         return requestq_count;
 771 }
 772
 773 static int zcrypt_count_type(int type)
 774 {
 775         struct zcrypt_device *zdev;
 776         int device_count = 0;
 777
 778         spin_lock_bh(&zcrypt_device_lock);
 779         list_for_each_entry(zdev, &zcrypt_device_list, list)
 780                 if (zdev->user_space_type == type)
 781                         device_count++;
 782         spin_unlock_bh(&zcrypt_device_lock);
 783         return device_count;
 784 }
 785
 786 /**
 787  * zcrypt_ica_status(): Old, depracted combi status call.
 788  *
 789  * Old, deprecated combi status call.
 790  */
 791 static long zcrypt_ica_status(struct file *filp, unsigned long arg)
 792 {
 793         struct ica_z90_status *pstat;
 794         int ret;
 795
 796         pstat = kzalloc(sizeof(*pstat), GFP_KERNEL);
 797         if (!pstat)
 798                 return -ENOMEM;
 799         pstat->totalcount = zcrypt_device_count;
 800         pstat->leedslitecount = zcrypt_count_type(ZCRYPT_PCICA);
 801         pstat->leeds2count = zcrypt_count_type(ZCRYPT_PCICC);
 802         pstat->requestqWaitCount = zcrypt_requestq_count();
 803         pstat->pendingqWaitCount = zcrypt_pendingq_count();
 804         pstat->totalOpenCount = atomic_read(&zcrypt_open_count);
 805         pstat->cryptoDomain = ap_domain_index;
 806         zcrypt_status_mask(pstat->status);
 807         zcrypt_qdepth_mask(pstat->qdepth);
 808         ret = 0;
 809         if (copy_to_user((void __user *) arg, pstat, sizeof(*pstat)))
 810                 ret = -EFAULT;
 811         kfree(pstat);
 812         return ret;
 813 }
 814
 815 static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
 816                                   unsigned long arg)
 817 {
 818         int rc;
 819
 820         switch (cmd) {
 821         case ICARSAMODEXPO: {
 822                 struct ica_rsa_modexpo __user *umex = (void __user *) arg;
 823                 struct ica_rsa_modexpo mex;
 824                 if (copy_from_user(&mex, umex, sizeof(mex)))
 825                         return -EFAULT;
 826                 do {
 827                         rc = zcrypt_rsa_modexpo(&mex);
 828                 } while (rc == -EAGAIN);
 829                 /* on failure: retry once again after a requested rescan */
 830                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
 831                         do {
 832                                 rc = zcrypt_rsa_modexpo(&mex);
 833                         } while (rc == -EAGAIN);
 834                 if (rc)
 835                         return rc;
 836                 return put_user(mex.outputdatalength, &umex->outputdatalength);
 837         }
 838         case ICARSACRT: {
 839                 struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg;
 840                 struct ica_rsa_modexpo_crt crt;
 841                 if (copy_from_user(&crt, ucrt, sizeof(crt)))
 842                         return -EFAULT;
 843                 do {
 844                         rc = zcrypt_rsa_crt(&crt);
 845                 } while (rc == -EAGAIN);
 846                 /* on failure: retry once again after a requested rescan */
 847                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
 848                         do {
 849                                 rc = zcrypt_rsa_crt(&crt);
 850                         } while (rc == -EAGAIN);
 851                 if (rc)
 852                         return rc;
 853                 return put_user(crt.outputdatalength, &ucrt->outputdatalength);
 854         }
 855         case ZSECSENDCPRB: {
 856                 struct ica_xcRB __user *uxcRB = (void __user *) arg;
 857                 struct ica_xcRB xcRB;
 858                 if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB)))
 859                         return -EFAULT;
 860                 do {
 861                         rc = zcrypt_send_cprb(&xcRB);
 862                 } while (rc == -EAGAIN);
 863                 /* on failure: retry once again after a requested rescan */
 864                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
 865                         do {
 866                                 rc = zcrypt_send_cprb(&xcRB);
 867                         } while (rc == -EAGAIN);
 868                 if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB)))
 869                         return -EFAULT;
 870                 return rc;
 871         }
 872         case ZSENDEP11CPRB: {
 873                 struct ep11_urb __user *uxcrb = (void __user *)arg;
 874                 struct ep11_urb xcrb;
 875                 if (copy_from_user(&xcrb, uxcrb, sizeof(xcrb)))
 876                         return -EFAULT;
 877                 do {
 878                         rc = zcrypt_send_ep11_cprb(&xcrb);
 879                 } while (rc == -EAGAIN);
 880                 /* on failure: retry once again after a requested rescan */
 881                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
 882                         do {
 883                                 rc = zcrypt_send_ep11_cprb(&xcrb);
 884                         } while (rc == -EAGAIN);
 885                 if (copy_to_user(uxcrb, &xcrb, sizeof(xcrb)))
 886                         return -EFAULT;
 887                 return rc;
 888         }
 889         case Z90STAT_STATUS_MASK: {
 890                 char status[AP_DEVICES];
 891                 zcrypt_status_mask(status);
 892                 if (copy_to_user((char __user *) arg, status,
 893                                  sizeof(char) * AP_DEVICES))
 894                         return -EFAULT;
 895                 return 0;
 896         }
 897         case Z90STAT_QDEPTH_MASK: {
 898                 char qdepth[AP_DEVICES];
 899                 zcrypt_qdepth_mask(qdepth);
 900                 if (copy_to_user((char __user *) arg, qdepth,
 901                                  sizeof(char) * AP_DEVICES))
 902                         return -EFAULT;
 903                 return 0;
 904         }
 905         case Z90STAT_PERDEV_REQCNT: {
 906                 int reqcnt[AP_DEVICES];
 907                 zcrypt_perdev_reqcnt(reqcnt);
 908                 if (copy_to_user((int __user *) arg, reqcnt,
 909                                  sizeof(int) * AP_DEVICES))
 910                         return -EFAULT;
 911                 return 0;
 912         }
 913         case Z90STAT_REQUESTQ_COUNT:
 914                 return put_user(zcrypt_requestq_count(), (int __user *) arg);
 915         case Z90STAT_PENDINGQ_COUNT:
 916                 return put_user(zcrypt_pendingq_count(), (int __user *) arg);
 917         case Z90STAT_TOTALOPEN_COUNT:
 918                 return put_user(atomic_read(&zcrypt_open_count),
 919                                 (int __user *) arg);
 920         case Z90STAT_DOMAIN_INDEX:
 921                 return put_user(ap_domain_index, (int __user *) arg);
 922         /*
 923          * Deprecated ioctls. Don't add another device count ioctl,
 924          * you can count them yourself in the user space with the
 925          * output of the Z90STAT_STATUS_MASK ioctl.
 926          */
 927         case ICAZ90STATUS:
 928                 return zcrypt_ica_status(filp, arg);
 929         case Z90STAT_TOTALCOUNT:
 930                 return put_user(zcrypt_device_count, (int __user *) arg);
 931         case Z90STAT_PCICACOUNT:
 932                 return put_user(zcrypt_count_type(ZCRYPT_PCICA),
 933                                 (int __user *) arg);
 934         case Z90STAT_PCICCCOUNT:
 935                 return put_user(zcrypt_count_type(ZCRYPT_PCICC),
 936                                 (int __user *) arg);
 937         case Z90STAT_PCIXCCMCL2COUNT:
 938                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2),
 939                                 (int __user *) arg);
 940         case Z90STAT_PCIXCCMCL3COUNT:
 941                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
 942                                 (int __user *) arg);
 943         case Z90STAT_PCIXCCCOUNT:
 944                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2) +
 945                                 zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
 946                                 (int __user *) arg);
 947         case Z90STAT_CEX2CCOUNT:
 948                 return put_user(zcrypt_count_type(ZCRYPT_CEX2C),
 949                                 (int __user *) arg);
 950         case Z90STAT_CEX2ACOUNT:
 951                 return put_user(zcrypt_count_type(ZCRYPT_CEX2A),
 952                                 (int __user *) arg);
 953         default:
 954                 /* unknown ioctl number */
 955                 return -ENOIOCTLCMD;
 956         }
 957 }
 958
 959 #ifdef CONFIG_COMPAT
 960 /*
 961  * ioctl32 conversion routines
 962  */
 963 struct compat_ica_rsa_modexpo {
 964         compat_uptr_t   inputdata;
 965         unsigned int    inputdatalength;
 966         compat_uptr_t   outputdata;
 967         unsigned int    outputdatalength;
 968         compat_uptr_t   b_key;
 969         compat_uptr_t   n_modulus;
 970 };
 971
 972 static long trans_modexpo32(struct file *filp, unsigned int cmd,
 973                             unsigned long arg)
 974 {
 975         struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg);
 976         struct compat_ica_rsa_modexpo mex32;
 977         struct ica_rsa_modexpo mex64;
 978         long rc;
 979
 980         if (copy_from_user(&mex32, umex32, sizeof(mex32)))
 981                 return -EFAULT;
 982         mex64.inputdata = compat_ptr(mex32.inputdata);
 983         mex64.inputdatalength = mex32.inputdatalength;
 984         mex64.outputdata = compat_ptr(mex32.outputdata);
 985         mex64.outputdatalength = mex32.outputdatalength;
 986         mex64.b_key = compat_ptr(mex32.b_key);
 987         mex64.n_modulus = compat_ptr(mex32.n_modulus);
 988         do {
 989                 rc = zcrypt_rsa_modexpo(&mex64);
 990         } while (rc == -EAGAIN);
 991         /* on failure: retry once again after a requested rescan */
 992         if ((rc == -ENODEV) && (zcrypt_process_rescan()))
 993                 do {
 994                         rc = zcrypt_rsa_modexpo(&mex64);
 995                 } while (rc == -EAGAIN);
 996         if (rc)
 997                 return rc;
 998         return put_user(mex64.outputdatalength,
 999                         &umex32->outputdatalength);
1000 }
1001
1002 struct compat_ica_rsa_modexpo_crt {
1003         compat_uptr_t   inputdata;
1004         unsigned int    inputdatalength;
1005         compat_uptr_t   outputdata;
1006         unsigned int    outputdatalength;
1007         compat_uptr_t   bp_key;
1008         compat_uptr_t   bq_key;
1009         compat_uptr_t   np_prime;
1010         compat_uptr_t   nq_prime;
1011         compat_uptr_t   u_mult_inv;
1012 };
1013
1014 static long trans_modexpo_crt32(struct file *filp, unsigned int cmd,
1015                                 unsigned long arg)
1016 {
1017         struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg);
1018         struct compat_ica_rsa_modexpo_crt crt32;
1019         struct ica_rsa_modexpo_crt crt64;
1020         long rc;
1021
1022         if (copy_from_user(&crt32, ucrt32, sizeof(crt32)))
1023                 return -EFAULT;
1024         crt64.inputdata = compat_ptr(crt32.inputdata);
1025         crt64.inputdatalength = crt32.inputdatalength;
1026         crt64.outputdata=  compat_ptr(crt32.outputdata);
1027         crt64.outputdatalength = crt32.outputdatalength;
1028         crt64.bp_key = compat_ptr(crt32.bp_key);
1029         crt64.bq_key = compat_ptr(crt32.bq_key);
1030         crt64.np_prime = compat_ptr(crt32.np_prime);
1031         crt64.nq_prime = compat_ptr(crt32.nq_prime);
1032         crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv);
1033         do {
1034                 rc = zcrypt_rsa_crt(&crt64);
1035         } while (rc == -EAGAIN);
1036         /* on failure: retry once again after a requested rescan */
1037         if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1038                 do {
1039                         rc = zcrypt_rsa_crt(&crt64);
1040                 } while (rc == -EAGAIN);
1041         if (rc)
1042                 return rc;
1043         return put_user(crt64.outputdatalength,
1044                         &ucrt32->outputdatalength);
1045 }
1046
1047 struct compat_ica_xcRB {
1048         unsigned short  agent_ID;
1049         unsigned int    user_defined;
1050         unsigned short  request_ID;
1051         unsigned int    request_control_blk_length;
1052         unsigned char   padding1[16 - sizeof (compat_uptr_t)];
1053         compat_uptr_t   request_control_blk_addr;
1054         unsigned int    request_data_length;
1055         char            padding2[16 - sizeof (compat_uptr_t)];
1056         compat_uptr_t   request_data_address;
1057         unsigned int    reply_control_blk_length;
1058         char            padding3[16 - sizeof (compat_uptr_t)];
1059         compat_uptr_t   reply_control_blk_addr;
1060         unsigned int    reply_data_length;
1061         char            padding4[16 - sizeof (compat_uptr_t)];
1062         compat_uptr_t   reply_data_addr;
1063         unsigned short  priority_window;
1064         unsigned int    status;
1065 } __attribute__((packed));
1066
1067 static long trans_xcRB32(struct file *filp, unsigned int cmd,
1068                          unsigned long arg)
1069 {
1070         struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg);
1071         struct compat_ica_xcRB xcRB32;
1072         struct ica_xcRB xcRB64;
1073         long rc;
1074
1075         if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32)))
1076                 return -EFAULT;
1077         xcRB64.agent_ID = xcRB32.agent_ID;
1078         xcRB64.user_defined = xcRB32.user_defined;
1079         xcRB64.request_ID = xcRB32.request_ID;
1080         xcRB64.request_control_blk_length =
1081                 xcRB32.request_control_blk_length;
1082         xcRB64.request_control_blk_addr =
1083                 compat_ptr(xcRB32.request_control_blk_addr);
1084         xcRB64.request_data_length =
1085                 xcRB32.request_data_length;
1086         xcRB64.request_data_address =
1087                 compat_ptr(xcRB32.request_data_address);
1088         xcRB64.reply_control_blk_length =
1089                 xcRB32.reply_control_blk_length;
1090         xcRB64.reply_control_blk_addr =
1091                 compat_ptr(xcRB32.reply_control_blk_addr);
1092         xcRB64.reply_data_length = xcRB32.reply_data_length;
1093         xcRB64.reply_data_addr =
1094                 compat_ptr(xcRB32.reply_data_addr);
1095         xcRB64.priority_window = xcRB32.priority_window;
1096         xcRB64.status = xcRB32.status;
1097         do {
1098                 rc = zcrypt_send_cprb(&xcRB64);
1099         } while (rc == -EAGAIN);
1100         /* on failure: retry once again after a requested rescan */
1101         if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1102                 do {
1103                         rc = zcrypt_send_cprb(&xcRB64);
1104                 } while (rc == -EAGAIN);
1105         xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length;
1106         xcRB32.reply_data_length = xcRB64.reply_data_length;
1107         xcRB32.status = xcRB64.status;
1108         if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32)))
1109                         return -EFAULT;
1110         return rc;
1111 }
1112
1113 static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd,
1114                          unsigned long arg)
1115 {
1116         if (cmd == ICARSAMODEXPO)
1117                 return trans_modexpo32(filp, cmd, arg);
1118         if (cmd == ICARSACRT)
1119                 return trans_modexpo_crt32(filp, cmd, arg);
1120         if (cmd == ZSECSENDCPRB)
1121                 return trans_xcRB32(filp, cmd, arg);
1122         return zcrypt_unlocked_ioctl(filp, cmd, arg);
1123 }
1124 #endif
1125
1126 /*
1127  * Misc device file operations.
1128  */
1129 static const struct file_operations zcrypt_fops = {
1130         .owner          = THIS_MODULE,
1131         .read           = zcrypt_read,
1132         .write          = zcrypt_write,
1133         .unlocked_ioctl = zcrypt_unlocked_ioctl,
1134 #ifdef CONFIG_COMPAT
1135         .compat_ioctl   = zcrypt_compat_ioctl,
1136 #endif
1137         .open           = zcrypt_open,
1138         .release        = zcrypt_release,
1139         .llseek         = no_llseek,
1140 };
1141
1142 /*
1143  * Misc device.
1144  */
1145 static struct miscdevice zcrypt_misc_device = {
1146         .minor      = MISC_DYNAMIC_MINOR,
1147         .name       = "z90crypt",
1148         .fops       = &zcrypt_fops,
1149 };
1150
1151 /*
1152  * Deprecated /proc entry support.
1153  */
1154 static struct proc_dir_entry *zcrypt_entry;
1155
1156 static void sprintcl(struct seq_file *m, unsigned char *addr, unsigned int len)
1157 {
1158         int i;
1159
1160         for (i = 0; i < len; i++)
1161                 seq_printf(m, "%01x", (unsigned int) addr[i]);
1162         seq_putc(m, ' ');
1163 }
1164
1165 static void sprintrw(struct seq_file *m, unsigned char *addr, unsigned int len)
1166 {
1167         int inl, c, cx;
1168
1169         seq_printf(m, "    ");
1170         inl = 0;
1171         for (c = 0; c < (len / 16); c++) {
1172                 sprintcl(m, addr+inl, 16);
1173                 inl += 16;
1174         }
1175         cx = len%16;
1176         if (cx) {
1177                 sprintcl(m, addr+inl, cx);
1178                 inl += cx;
1179         }
1180         seq_putc(m, '\n');
1181 }
1182
1183 static void sprinthx(unsigned char *title, struct seq_file *m,
1184                      unsigned char *addr, unsigned int len)
1185 {
1186         int inl, r, rx;
1187
1188         seq_printf(m, "\n%s\n", title);
1189         inl = 0;
1190         for (r = 0; r < (len / 64); r++) {
1191                 sprintrw(m, addr+inl, 64);
1192                 inl += 64;
1193         }
1194         rx = len % 64;
1195         if (rx) {
1196                 sprintrw(m, addr+inl, rx);
1197                 inl += rx;
1198         }
1199         seq_putc(m, '\n');
1200 }
1201
1202 static void sprinthx4(unsigned char *title, struct seq_file *m,
1203                       unsigned int *array, unsigned int len)
1204 {
1205         int r;
1206
1207         seq_printf(m, "\n%s\n", title);
1208         for (r = 0; r < len; r++) {
1209                 if ((r % 8) == 0)
1210                         seq_printf(m, "    ");
1211                 seq_printf(m, "%08X ", array[r]);
1212                 if ((r % 8) == 7)
1213                         seq_putc(m, '\n');
1214         }
1215         seq_putc(m, '\n');
1216 }
1217
1218 static int zcrypt_proc_show(struct seq_file *m, void *v)
1219 {
1220         char workarea[sizeof(int) * AP_DEVICES];
1221
1222         seq_printf(m, "\nzcrypt version: %d.%d.%d\n",
1223                    ZCRYPT_VERSION, ZCRYPT_RELEASE, ZCRYPT_VARIANT);
1224         seq_printf(m, "Cryptographic domain: %d\n", ap_domain_index);
1225         seq_printf(m, "Total device count: %d\n", zcrypt_device_count);
1226         seq_printf(m, "PCICA count: %d\n", zcrypt_count_type(ZCRYPT_PCICA));
1227         seq_printf(m, "PCICC count: %d\n", zcrypt_count_type(ZCRYPT_PCICC));
1228         seq_printf(m, "PCIXCC MCL2 count: %d\n",
1229                    zcrypt_count_type(ZCRYPT_PCIXCC_MCL2));
1230         seq_printf(m, "PCIXCC MCL3 count: %d\n",
1231                    zcrypt_count_type(ZCRYPT_PCIXCC_MCL3));
1232         seq_printf(m, "CEX2C count: %d\n", zcrypt_count_type(ZCRYPT_CEX2C));
1233         seq_printf(m, "CEX2A count: %d\n", zcrypt_count_type(ZCRYPT_CEX2A));
1234         seq_printf(m, "CEX3C count: %d\n", zcrypt_count_type(ZCRYPT_CEX3C));
1235         seq_printf(m, "CEX3A count: %d\n", zcrypt_count_type(ZCRYPT_CEX3A));
1236         seq_printf(m, "requestq count: %d\n", zcrypt_requestq_count());
1237         seq_printf(m, "pendingq count: %d\n", zcrypt_pendingq_count());
1238         seq_printf(m, "Total open handles: %d\n\n",
1239                    atomic_read(&zcrypt_open_count));
1240         zcrypt_status_mask(workarea);
1241         sprinthx("Online devices: 1=PCICA 2=PCICC 3=PCIXCC(MCL2) "
1242                  "4=PCIXCC(MCL3) 5=CEX2C 6=CEX2A 7=CEX3C 8=CEX3A",
1243                  m, workarea, AP_DEVICES);
1244         zcrypt_qdepth_mask(workarea);
1245         sprinthx("Waiting work element counts", m, workarea, AP_DEVICES);
1246         zcrypt_perdev_reqcnt((int *) workarea);
1247         sprinthx4("Per-device successfully completed request counts",
1248                   m, (unsigned int *) workarea, AP_DEVICES);
1249         return 0;
1250 }
1251
1252 static int zcrypt_proc_open(struct inode *inode, struct file *file)
1253 {
1254         return single_open(file, zcrypt_proc_show, NULL);
1255 }
1256
1257 static void zcrypt_disable_card(int index)
1258 {
1259         struct zcrypt_device *zdev;
1260
1261         spin_lock_bh(&zcrypt_device_lock);
1262         list_for_each_entry(zdev, &zcrypt_device_list, list)
1263                 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
1264                         zdev->online = 0;
1265                         ap_flush_queue(zdev->ap_dev);
1266                         break;
1267                 }
1268         spin_unlock_bh(&zcrypt_device_lock);
1269 }
1270
1271 static void zcrypt_enable_card(int index)
1272 {
1273         struct zcrypt_device *zdev;
1274
1275         spin_lock_bh(&zcrypt_device_lock);
1276         list_for_each_entry(zdev, &zcrypt_device_list, list)
1277                 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
1278                         zdev->online = 1;
1279                         break;
1280                 }
1281         spin_unlock_bh(&zcrypt_device_lock);
1282 }
1283
1284 static ssize_t zcrypt_proc_write(struct file *file, const char __user *buffer,
1285                                  size_t count, loff_t *pos)
1286 {
1287         unsigned char *lbuf, *ptr;
1288         size_t local_count;
1289         int j;
1290
1291         if (count <= 0)
1292                 return 0;
1293
1294 #define LBUFSIZE 1200UL
1295         lbuf = kmalloc(LBUFSIZE, GFP_KERNEL);
1296         if (!lbuf)
1297                 return 0;
1298
1299         local_count = min(LBUFSIZE - 1, count);
1300         if (copy_from_user(lbuf, buffer, local_count) != 0) {
1301                 kfree(lbuf);
1302                 return -EFAULT;
1303         }
1304         lbuf[local_count] = '\0';
1305
1306         ptr = strstr(lbuf, "Online devices");
1307         if (!ptr)
1308                 goto out;
1309         ptr = strstr(ptr, "\n");
1310         if (!ptr)
1311                 goto out;
1312         ptr++;
1313
1314         if (strstr(ptr, "Waiting work element counts") == NULL)
1315                 goto out;
1316
1317         for (j = 0; j < 64 && *ptr; ptr++) {
1318                 /*
1319                  * '0' for no device, '1' for PCICA, '2' for PCICC,
1320                  * '3' for PCIXCC_MCL2, '4' for PCIXCC_MCL3,
1321                  * '5' for CEX2C and '6' for CEX2A'
1322                  * '7' for CEX3C and '8' for CEX3A
1323                  */
1324                 if (*ptr >= '0' && *ptr <= '8')
1325                         j++;
1326                 else if (*ptr == 'd' || *ptr == 'D')
1327                         zcrypt_disable_card(j++);
1328                 else if (*ptr == 'e' || *ptr == 'E')
1329                         zcrypt_enable_card(j++);
1330                 else if (*ptr != ' ' && *ptr != '\t')
1331                         break;
1332         }
1333 out:
1334         kfree(lbuf);
1335         return count;
1336 }
1337
1338 static const struct file_operations zcrypt_proc_fops = {
1339         .owner          = THIS_MODULE,
1340         .open           = zcrypt_proc_open,
1341         .read           = seq_read,
1342         .llseek         = seq_lseek,
1343         .release        = single_release,
1344         .write          = zcrypt_proc_write,
1345 };
1346
1347 static int zcrypt_rng_device_count;
1348 static u32 *zcrypt_rng_buffer;
1349 static int zcrypt_rng_buffer_index;
1350 static DEFINE_MUTEX(zcrypt_rng_mutex);
1351
1352 static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
1353 {
1354         int rc;
1355
1356         /*
1357          * We don't need locking here because the RNG API guarantees serialized
1358          * read method calls.
1359          */
1360         if (zcrypt_rng_buffer_index == 0) {
1361                 rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1362                 /* on failure: retry once again after a requested rescan */
1363                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1364                         rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1365                 if (rc < 0)
1366                         return -EIO;
1367                 zcrypt_rng_buffer_index = rc / sizeof *data;
1368         }
1369         *data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index];
1370         return sizeof *data;
1371 }
1372
1373 static struct hwrng zcrypt_rng_dev = {
1374         .name           = "zcrypt",
1375         .data_read      = zcrypt_rng_data_read,
1376 };
1377
1378 static int zcrypt_rng_device_add(void)
1379 {
1380         int rc = 0;
1381
1382         mutex_lock(&zcrypt_rng_mutex);
1383         if (zcrypt_rng_device_count == 0) {
1384                 zcrypt_rng_buffer = (u32 *) get_zeroed_page(GFP_KERNEL);
1385                 if (!zcrypt_rng_buffer) {
1386                         rc = -ENOMEM;
1387                         goto out;
1388                 }
1389                 zcrypt_rng_buffer_index = 0;
1390                 rc = hwrng_register(&zcrypt_rng_dev);
1391                 if (rc)
1392                         goto out_free;
1393                 zcrypt_rng_device_count = 1;
1394         } else
1395                 zcrypt_rng_device_count++;
1396         mutex_unlock(&zcrypt_rng_mutex);
1397         return 0;
1398
1399 out_free:
1400         free_page((unsigned long) zcrypt_rng_buffer);
1401 out:
1402         mutex_unlock(&zcrypt_rng_mutex);
1403         return rc;
1404 }
1405
1406 static void zcrypt_rng_device_remove(void)
1407 {
1408         mutex_lock(&zcrypt_rng_mutex);
1409         zcrypt_rng_device_count--;
1410         if (zcrypt_rng_device_count == 0) {
1411                 hwrng_unregister(&zcrypt_rng_dev);
1412                 free_page((unsigned long) zcrypt_rng_buffer);
1413         }
1414         mutex_unlock(&zcrypt_rng_mutex);
1415 }
1416
1417 int __init zcrypt_debug_init(void)
1418 {
1419         debugfs_root = debugfs_create_dir("zcrypt", NULL);
1420
1421         zcrypt_dbf_common = debug_register("zcrypt_common", 1, 1, 16);
1422         debug_register_view(zcrypt_dbf_common, &debug_hex_ascii_view);
1423         debug_set_level(zcrypt_dbf_common, DBF_ERR);
1424
1425         zcrypt_dbf_devices = debug_register("zcrypt_devices", 1, 1, 16);
1426         debug_register_view(zcrypt_dbf_devices, &debug_hex_ascii_view);
1427         debug_set_level(zcrypt_dbf_devices, DBF_ERR);
1428
1429         return 0;
1430 }
1431
1432 void zcrypt_debug_exit(void)
1433 {
1434         debugfs_remove(debugfs_root);
1435         if (zcrypt_dbf_common)
1436                 debug_unregister(zcrypt_dbf_common);
1437         if (zcrypt_dbf_devices)
1438                 debug_unregister(zcrypt_dbf_devices);
1439 }
1440
1441 /**
1442  * zcrypt_api_init(): Module initialization.
1443  *
1444  * The module initialization code.
1445  */
1446 int __init zcrypt_api_init(void)
1447 {
1448         int rc;
1449
1450         rc = zcrypt_debug_init();
1451         if (rc)
1452                 goto out;
1453
1454         atomic_set(&zcrypt_rescan_req, 0);
1455
1456         /* Register the request sprayer. */
1457         rc = misc_register(&zcrypt_misc_device);
1458         if (rc < 0)
1459                 goto out;
1460
1461         /* Set up the proc file system */
1462         zcrypt_entry = proc_create("driver/z90crypt", 0644, NULL, &zcrypt_proc_fops);
1463         if (!zcrypt_entry) {
1464                 rc = -ENOMEM;
1465                 goto out_misc;
1466         }
1467
1468         return 0;
1469
1470 out_misc:
1471         misc_deregister(&zcrypt_misc_device);
1472 out:
1473         return rc;
1474 }
1475
1476 /**
1477  * zcrypt_api_exit(): Module termination.
1478  *
1479  * The module termination code.
1480  */
1481 void zcrypt_api_exit(void)
1482 {
1483         remove_proc_entry("driver/z90crypt", NULL);
1484         misc_deregister(&zcrypt_misc_device);
1485         zcrypt_debug_exit();
1486 }
1487
1488 module_init(zcrypt_api_init);
1489 module_exit(zcrypt_api_exit);