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 if (zops->owner) { 321 spin_lock_bh(&zcrypt_ops_list_lock); 322 list_add_tail(&zops->list, &zcrypt_ops_list); 323 spin_unlock_bh(&zcrypt_ops_list_lock); 324 } 325 } 326 EXPORT_SYMBOL(zcrypt_msgtype_register); 327 328 void zcrypt_msgtype_unregister(struct zcrypt_ops *zops) 329 { 330 spin_lock_bh(&zcrypt_ops_list_lock); 331 list_del_init(&zops->list); 332 spin_unlock_bh(&zcrypt_ops_list_lock); 333 } 334 EXPORT_SYMBOL(zcrypt_msgtype_unregister); 335 336 static inline 337 struct zcrypt_ops *__ops_lookup(unsigned char *name, int variant) 338 { 339 struct zcrypt_ops *zops; 340 int found = 0; 341 342 spin_lock_bh(&zcrypt_ops_list_lock); 343 list_for_each_entry(zops, &zcrypt_ops_list, list) { 344 if ((zops->variant == variant) && 345 (!strncmp(zops->owner->name, name, MODULE_NAME_LEN))) { 346 found = 1; 347 break; 348 } 349 } 350 if (!found || !try_module_get(zops->owner)) 351 zops = NULL; 352 353 spin_unlock_bh(&zcrypt_ops_list_lock); 354 355 return zops; 356 } 357 358 struct zcrypt_ops *zcrypt_msgtype_request(unsigned char *name, int variant) 359 { 360 struct zcrypt_ops *zops = NULL; 361 362 zops = __ops_lookup(name, variant); 363 if (!zops) { 364 request_module("%s", name); 365 zops = __ops_lookup(name, variant); 366 } 367 return zops; 368 } 369 EXPORT_SYMBOL(zcrypt_msgtype_request); 370 371 void zcrypt_msgtype_release(struct zcrypt_ops *zops) 372 { 373 if (zops) 374 module_put(zops->owner); 375 } 376 EXPORT_SYMBOL(zcrypt_msgtype_release); 377 378 /** 379 * zcrypt_read (): Not supported beyond zcrypt 1.3.1. 380 * 381 * This function is not supported beyond zcrypt 1.3.1. 382 */ 383 static ssize_t zcrypt_read(struct file *filp, char __user *buf, 384 size_t count, loff_t *f_pos) 385 { 386 return -EPERM; 387 } 388 389 /** 390 * zcrypt_write(): Not allowed. 391 * 392 * Write is is not allowed 393 */ 394 static ssize_t zcrypt_write(struct file *filp, const char __user *buf, 395 size_t count, loff_t *f_pos) 396 { 397 return -EPERM; 398 } 399 400 /** 401 * zcrypt_open(): Count number of users. 402 * 403 * Device open function to count number of users. 404 */ 405 static int zcrypt_open(struct inode *inode, struct file *filp) 406 { 407 atomic_inc(&zcrypt_open_count); 408 return nonseekable_open(inode, filp); 409 } 410 411 /** 412 * zcrypt_release(): Count number of users. 413 * 414 * Device close function to count number of users. 415 */ 416 static int zcrypt_release(struct inode *inode, struct file *filp) 417 { 418 atomic_dec(&zcrypt_open_count); 419 return 0; 420 } 421 422 /* 423 * zcrypt ioctls. 424 */ 425 static long zcrypt_rsa_modexpo(struct ica_rsa_modexpo *mex) 426 { 427 struct zcrypt_device *zdev; 428 int rc; 429 430 if (mex->outputdatalength < mex->inputdatalength) 431 return -EINVAL; 432 /* 433 * As long as outputdatalength is big enough, we can set the 434 * outputdatalength equal to the inputdatalength, since that is the 435 * number of bytes we will copy in any case 436 */ 437 mex->outputdatalength = mex->inputdatalength; 438 439 spin_lock_bh(&zcrypt_device_lock); 440 list_for_each_entry(zdev, &zcrypt_device_list, list) { 441 if (!zdev->online || 442 !zdev->ops->rsa_modexpo || 443 zdev->min_mod_size > mex->inputdatalength || 444 zdev->max_mod_size < mex->inputdatalength) 445 continue; 446 zcrypt_device_get(zdev); 447 get_device(&zdev->ap_dev->device); 448 zdev->request_count++; 449 __zcrypt_decrease_preference(zdev); 450 if (try_module_get(zdev->ap_dev->drv->driver.owner)) { 451 spin_unlock_bh(&zcrypt_device_lock); 452 rc = zdev->ops->rsa_modexpo(zdev, mex); 453 spin_lock_bh(&zcrypt_device_lock); 454 module_put(zdev->ap_dev->drv->driver.owner); 455 } 456 else 457 rc = -EAGAIN; 458 zdev->request_count--; 459 __zcrypt_increase_preference(zdev); 460 put_device(&zdev->ap_dev->device); 461 zcrypt_device_put(zdev); 462 spin_unlock_bh(&zcrypt_device_lock); 463 return rc; 464 } 465 spin_unlock_bh(&zcrypt_device_lock); 466 return -ENODEV; 467 } 468 469 static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt) 470 { 471 struct zcrypt_device *zdev; 472 unsigned long long z1, z2, z3; 473 int rc, copied; 474 475 if (crt->outputdatalength < crt->inputdatalength) 476 return -EINVAL; 477 /* 478 * As long as outputdatalength is big enough, we can set the 479 * outputdatalength equal to the inputdatalength, since that is the 480 * number of bytes we will copy in any case 481 */ 482 crt->outputdatalength = crt->inputdatalength; 483 484 copied = 0; 485 restart: 486 spin_lock_bh(&zcrypt_device_lock); 487 list_for_each_entry(zdev, &zcrypt_device_list, list) { 488 if (!zdev->online || 489 !zdev->ops->rsa_modexpo_crt || 490 zdev->min_mod_size > crt->inputdatalength || 491 zdev->max_mod_size < crt->inputdatalength) 492 continue; 493 if (zdev->short_crt && crt->inputdatalength > 240) { 494 /* 495 * Check inputdata for leading zeros for cards 496 * that can't handle np_prime, bp_key, or 497 * u_mult_inv > 128 bytes. 498 */ 499 if (copied == 0) { 500 unsigned int len; 501 spin_unlock_bh(&zcrypt_device_lock); 502 /* len is max 256 / 2 - 120 = 8 503 * For bigger device just assume len of leading 504 * 0s is 8 as stated in the requirements for 505 * ica_rsa_modexpo_crt struct in zcrypt.h. 506 */ 507 if (crt->inputdatalength <= 256) 508 len = crt->inputdatalength / 2 - 120; 509 else 510 len = 8; 511 if (len > sizeof(z1)) 512 return -EFAULT; 513 z1 = z2 = z3 = 0; 514 if (copy_from_user(&z1, crt->np_prime, len) || 515 copy_from_user(&z2, crt->bp_key, len) || 516 copy_from_user(&z3, crt->u_mult_inv, len)) 517 return -EFAULT; 518 z1 = z2 = z3 = 0; 519 copied = 1; 520 /* 521 * We have to restart device lookup - 522 * the device list may have changed by now. 523 */ 524 goto restart; 525 } 526 if (z1 != 0ULL || z2 != 0ULL || z3 != 0ULL) 527 /* The device can't handle this request. */ 528 continue; 529 } 530 zcrypt_device_get(zdev); 531 get_device(&zdev->ap_dev->device); 532 zdev->request_count++; 533 __zcrypt_decrease_preference(zdev); 534 if (try_module_get(zdev->ap_dev->drv->driver.owner)) { 535 spin_unlock_bh(&zcrypt_device_lock); 536 rc = zdev->ops->rsa_modexpo_crt(zdev, crt); 537 spin_lock_bh(&zcrypt_device_lock); 538 module_put(zdev->ap_dev->drv->driver.owner); 539 } 540 else 541 rc = -EAGAIN; 542 zdev->request_count--; 543 __zcrypt_increase_preference(zdev); 544 put_device(&zdev->ap_dev->device); 545 zcrypt_device_put(zdev); 546 spin_unlock_bh(&zcrypt_device_lock); 547 return rc; 548 } 549 spin_unlock_bh(&zcrypt_device_lock); 550 return -ENODEV; 551 } 552 553 static long zcrypt_send_cprb(struct ica_xcRB *xcRB) 554 { 555 struct zcrypt_device *zdev; 556 int rc; 557 558 spin_lock_bh(&zcrypt_device_lock); 559 list_for_each_entry(zdev, &zcrypt_device_list, list) { 560 if (!zdev->online || !zdev->ops->send_cprb || 561 (zdev->ops->variant == MSGTYPE06_VARIANT_EP11) || 562 (xcRB->user_defined != AUTOSELECT && 563 AP_QID_DEVICE(zdev->ap_dev->qid) != xcRB->user_defined)) 564 continue; 565 zcrypt_device_get(zdev); 566 get_device(&zdev->ap_dev->device); 567 zdev->request_count++; 568 __zcrypt_decrease_preference(zdev); 569 if (try_module_get(zdev->ap_dev->drv->driver.owner)) { 570 spin_unlock_bh(&zcrypt_device_lock); 571 rc = zdev->ops->send_cprb(zdev, xcRB); 572 spin_lock_bh(&zcrypt_device_lock); 573 module_put(zdev->ap_dev->drv->driver.owner); 574 } 575 else 576 rc = -EAGAIN; 577 zdev->request_count--; 578 __zcrypt_increase_preference(zdev); 579 put_device(&zdev->ap_dev->device); 580 zcrypt_device_put(zdev); 581 spin_unlock_bh(&zcrypt_device_lock); 582 return rc; 583 } 584 spin_unlock_bh(&zcrypt_device_lock); 585 return -ENODEV; 586 } 587 588 struct ep11_target_dev_list { 589 unsigned short targets_num; 590 struct ep11_target_dev *targets; 591 }; 592 593 static bool is_desired_ep11dev(unsigned int dev_qid, 594 struct ep11_target_dev_list dev_list) 595 { 596 int n; 597 598 for (n = 0; n < dev_list.targets_num; n++, dev_list.targets++) { 599 if ((AP_QID_DEVICE(dev_qid) == dev_list.targets->ap_id) && 600 (AP_QID_QUEUE(dev_qid) == dev_list.targets->dom_id)) { 601 return true; 602 } 603 } 604 return false; 605 } 606 607 static long zcrypt_send_ep11_cprb(struct ep11_urb *xcrb) 608 { 609 struct zcrypt_device *zdev; 610 bool autoselect = false; 611 int rc; 612 struct ep11_target_dev_list ep11_dev_list = { 613 .targets_num = 0x00, 614 .targets = NULL, 615 }; 616 617 ep11_dev_list.targets_num = (unsigned short) xcrb->targets_num; 618 619 /* empty list indicates autoselect (all available targets) */ 620 if (ep11_dev_list.targets_num == 0) 621 autoselect = true; 622 else { 623 ep11_dev_list.targets = kcalloc((unsigned short) 624 xcrb->targets_num, 625 sizeof(struct ep11_target_dev), 626 GFP_KERNEL); 627 if (!ep11_dev_list.targets) 628 return -ENOMEM; 629 630 if (copy_from_user(ep11_dev_list.targets, 631 (struct ep11_target_dev __force __user *) 632 xcrb->targets, xcrb->targets_num * 633 sizeof(struct ep11_target_dev))) 634 return -EFAULT; 635 } 636 637 spin_lock_bh(&zcrypt_device_lock); 638 list_for_each_entry(zdev, &zcrypt_device_list, list) { 639 /* check if device is eligible */ 640 if (!zdev->online || 641 zdev->ops->variant != MSGTYPE06_VARIANT_EP11) 642 continue; 643 644 /* check if device is selected as valid target */ 645 if (!is_desired_ep11dev(zdev->ap_dev->qid, ep11_dev_list) && 646 !autoselect) 647 continue; 648 649 zcrypt_device_get(zdev); 650 get_device(&zdev->ap_dev->device); 651 zdev->request_count++; 652 __zcrypt_decrease_preference(zdev); 653 if (try_module_get(zdev->ap_dev->drv->driver.owner)) { 654 spin_unlock_bh(&zcrypt_device_lock); 655 rc = zdev->ops->send_ep11_cprb(zdev, xcrb); 656 spin_lock_bh(&zcrypt_device_lock); 657 module_put(zdev->ap_dev->drv->driver.owner); 658 } else { 659 rc = -EAGAIN; 660 } 661 zdev->request_count--; 662 __zcrypt_increase_preference(zdev); 663 put_device(&zdev->ap_dev->device); 664 zcrypt_device_put(zdev); 665 spin_unlock_bh(&zcrypt_device_lock); 666 return rc; 667 } 668 spin_unlock_bh(&zcrypt_device_lock); 669 return -ENODEV; 670 } 671 672 static long zcrypt_rng(char *buffer) 673 { 674 struct zcrypt_device *zdev; 675 int rc; 676 677 spin_lock_bh(&zcrypt_device_lock); 678 list_for_each_entry(zdev, &zcrypt_device_list, list) { 679 if (!zdev->online || !zdev->ops->rng) 680 continue; 681 zcrypt_device_get(zdev); 682 get_device(&zdev->ap_dev->device); 683 zdev->request_count++; 684 __zcrypt_decrease_preference(zdev); 685 if (try_module_get(zdev->ap_dev->drv->driver.owner)) { 686 spin_unlock_bh(&zcrypt_device_lock); 687 rc = zdev->ops->rng(zdev, buffer); 688 spin_lock_bh(&zcrypt_device_lock); 689 module_put(zdev->ap_dev->drv->driver.owner); 690 } else 691 rc = -EAGAIN; 692 zdev->request_count--; 693 __zcrypt_increase_preference(zdev); 694 put_device(&zdev->ap_dev->device); 695 zcrypt_device_put(zdev); 696 spin_unlock_bh(&zcrypt_device_lock); 697 return rc; 698 } 699 spin_unlock_bh(&zcrypt_device_lock); 700 return -ENODEV; 701 } 702 703 static void zcrypt_status_mask(char status[AP_DEVICES]) 704 { 705 struct zcrypt_device *zdev; 706 707 memset(status, 0, sizeof(char) * AP_DEVICES); 708 spin_lock_bh(&zcrypt_device_lock); 709 list_for_each_entry(zdev, &zcrypt_device_list, list) 710 status[AP_QID_DEVICE(zdev->ap_dev->qid)] = 711 zdev->online ? zdev->user_space_type : 0x0d; 712 spin_unlock_bh(&zcrypt_device_lock); 713 } 714 715 static void zcrypt_qdepth_mask(char qdepth[AP_DEVICES]) 716 { 717 struct zcrypt_device *zdev; 718 719 memset(qdepth, 0, sizeof(char) * AP_DEVICES); 720 spin_lock_bh(&zcrypt_device_lock); 721 list_for_each_entry(zdev, &zcrypt_device_list, list) { 722 spin_lock(&zdev->ap_dev->lock); 723 qdepth[AP_QID_DEVICE(zdev->ap_dev->qid)] = 724 zdev->ap_dev->pendingq_count + 725 zdev->ap_dev->requestq_count; 726 spin_unlock(&zdev->ap_dev->lock); 727 } 728 spin_unlock_bh(&zcrypt_device_lock); 729 } 730 731 static void zcrypt_perdev_reqcnt(int reqcnt[AP_DEVICES]) 732 { 733 struct zcrypt_device *zdev; 734 735 memset(reqcnt, 0, sizeof(int) * AP_DEVICES); 736 spin_lock_bh(&zcrypt_device_lock); 737 list_for_each_entry(zdev, &zcrypt_device_list, list) { 738 spin_lock(&zdev->ap_dev->lock); 739 reqcnt[AP_QID_DEVICE(zdev->ap_dev->qid)] = 740 zdev->ap_dev->total_request_count; 741 spin_unlock(&zdev->ap_dev->lock); 742 } 743 spin_unlock_bh(&zcrypt_device_lock); 744 } 745 746 static int zcrypt_pendingq_count(void) 747 { 748 struct zcrypt_device *zdev; 749 int pendingq_count = 0; 750 751 spin_lock_bh(&zcrypt_device_lock); 752 list_for_each_entry(zdev, &zcrypt_device_list, list) { 753 spin_lock(&zdev->ap_dev->lock); 754 pendingq_count += zdev->ap_dev->pendingq_count; 755 spin_unlock(&zdev->ap_dev->lock); 756 } 757 spin_unlock_bh(&zcrypt_device_lock); 758 return pendingq_count; 759 } 760 761 static int zcrypt_requestq_count(void) 762 { 763 struct zcrypt_device *zdev; 764 int requestq_count = 0; 765 766 spin_lock_bh(&zcrypt_device_lock); 767 list_for_each_entry(zdev, &zcrypt_device_list, list) { 768 spin_lock(&zdev->ap_dev->lock); 769 requestq_count += zdev->ap_dev->requestq_count; 770 spin_unlock(&zdev->ap_dev->lock); 771 } 772 spin_unlock_bh(&zcrypt_device_lock); 773 return requestq_count; 774 } 775 776 static int zcrypt_count_type(int type) 777 { 778 struct zcrypt_device *zdev; 779 int device_count = 0; 780 781 spin_lock_bh(&zcrypt_device_lock); 782 list_for_each_entry(zdev, &zcrypt_device_list, list) 783 if (zdev->user_space_type == type) 784 device_count++; 785 spin_unlock_bh(&zcrypt_device_lock); 786 return device_count; 787 } 788 789 /** 790 * zcrypt_ica_status(): Old, depracted combi status call. 791 * 792 * Old, deprecated combi status call. 793 */ 794 static long zcrypt_ica_status(struct file *filp, unsigned long arg) 795 { 796 struct ica_z90_status *pstat; 797 int ret; 798 799 pstat = kzalloc(sizeof(*pstat), GFP_KERNEL); 800 if (!pstat) 801 return -ENOMEM; 802 pstat->totalcount = zcrypt_device_count; 803 pstat->leedslitecount = zcrypt_count_type(ZCRYPT_PCICA); 804 pstat->leeds2count = zcrypt_count_type(ZCRYPT_PCICC); 805 pstat->requestqWaitCount = zcrypt_requestq_count(); 806 pstat->pendingqWaitCount = zcrypt_pendingq_count(); 807 pstat->totalOpenCount = atomic_read(&zcrypt_open_count); 808 pstat->cryptoDomain = ap_domain_index; 809 zcrypt_status_mask(pstat->status); 810 zcrypt_qdepth_mask(pstat->qdepth); 811 ret = 0; 812 if (copy_to_user((void __user *) arg, pstat, sizeof(*pstat))) 813 ret = -EFAULT; 814 kfree(pstat); 815 return ret; 816 } 817 818 static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd, 819 unsigned long arg) 820 { 821 int rc; 822 823 switch (cmd) { 824 case ICARSAMODEXPO: { 825 struct ica_rsa_modexpo __user *umex = (void __user *) arg; 826 struct ica_rsa_modexpo mex; 827 if (copy_from_user(&mex, umex, sizeof(mex))) 828 return -EFAULT; 829 do { 830 rc = zcrypt_rsa_modexpo(&mex); 831 } while (rc == -EAGAIN); 832 /* on failure: retry once again after a requested rescan */ 833 if ((rc == -ENODEV) && (zcrypt_process_rescan())) 834 do { 835 rc = zcrypt_rsa_modexpo(&mex); 836 } while (rc == -EAGAIN); 837 if (rc) 838 return rc; 839 return put_user(mex.outputdatalength, &umex->outputdatalength); 840 } 841 case ICARSACRT: { 842 struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg; 843 struct ica_rsa_modexpo_crt crt; 844 if (copy_from_user(&crt, ucrt, sizeof(crt))) 845 return -EFAULT; 846 do { 847 rc = zcrypt_rsa_crt(&crt); 848 } while (rc == -EAGAIN); 849 /* on failure: retry once again after a requested rescan */ 850 if ((rc == -ENODEV) && (zcrypt_process_rescan())) 851 do { 852 rc = zcrypt_rsa_crt(&crt); 853 } while (rc == -EAGAIN); 854 if (rc) 855 return rc; 856 return put_user(crt.outputdatalength, &ucrt->outputdatalength); 857 } 858 case ZSECSENDCPRB: { 859 struct ica_xcRB __user *uxcRB = (void __user *) arg; 860 struct ica_xcRB xcRB; 861 if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB))) 862 return -EFAULT; 863 do { 864 rc = zcrypt_send_cprb(&xcRB); 865 } while (rc == -EAGAIN); 866 /* on failure: retry once again after a requested rescan */ 867 if ((rc == -ENODEV) && (zcrypt_process_rescan())) 868 do { 869 rc = zcrypt_send_cprb(&xcRB); 870 } while (rc == -EAGAIN); 871 if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB))) 872 return -EFAULT; 873 return rc; 874 } 875 case ZSENDEP11CPRB: { 876 struct ep11_urb __user *uxcrb = (void __user *)arg; 877 struct ep11_urb xcrb; 878 if (copy_from_user(&xcrb, uxcrb, sizeof(xcrb))) 879 return -EFAULT; 880 do { 881 rc = zcrypt_send_ep11_cprb(&xcrb); 882 } while (rc == -EAGAIN); 883 /* on failure: retry once again after a requested rescan */ 884 if ((rc == -ENODEV) && (zcrypt_process_rescan())) 885 do { 886 rc = zcrypt_send_ep11_cprb(&xcrb); 887 } while (rc == -EAGAIN); 888 if (copy_to_user(uxcrb, &xcrb, sizeof(xcrb))) 889 return -EFAULT; 890 return rc; 891 } 892 case Z90STAT_STATUS_MASK: { 893 char status[AP_DEVICES]; 894 zcrypt_status_mask(status); 895 if (copy_to_user((char __user *) arg, status, 896 sizeof(char) * AP_DEVICES)) 897 return -EFAULT; 898 return 0; 899 } 900 case Z90STAT_QDEPTH_MASK: { 901 char qdepth[AP_DEVICES]; 902 zcrypt_qdepth_mask(qdepth); 903 if (copy_to_user((char __user *) arg, qdepth, 904 sizeof(char) * AP_DEVICES)) 905 return -EFAULT; 906 return 0; 907 } 908 case Z90STAT_PERDEV_REQCNT: { 909 int reqcnt[AP_DEVICES]; 910 zcrypt_perdev_reqcnt(reqcnt); 911 if (copy_to_user((int __user *) arg, reqcnt, 912 sizeof(int) * AP_DEVICES)) 913 return -EFAULT; 914 return 0; 915 } 916 case Z90STAT_REQUESTQ_COUNT: 917 return put_user(zcrypt_requestq_count(), (int __user *) arg); 918 case Z90STAT_PENDINGQ_COUNT: 919 return put_user(zcrypt_pendingq_count(), (int __user *) arg); 920 case Z90STAT_TOTALOPEN_COUNT: 921 return put_user(atomic_read(&zcrypt_open_count), 922 (int __user *) arg); 923 case Z90STAT_DOMAIN_INDEX: 924 return put_user(ap_domain_index, (int __user *) arg); 925 /* 926 * Deprecated ioctls. Don't add another device count ioctl, 927 * you can count them yourself in the user space with the 928 * output of the Z90STAT_STATUS_MASK ioctl. 929 */ 930 case ICAZ90STATUS: 931 return zcrypt_ica_status(filp, arg); 932 case Z90STAT_TOTALCOUNT: 933 return put_user(zcrypt_device_count, (int __user *) arg); 934 case Z90STAT_PCICACOUNT: 935 return put_user(zcrypt_count_type(ZCRYPT_PCICA), 936 (int __user *) arg); 937 case Z90STAT_PCICCCOUNT: 938 return put_user(zcrypt_count_type(ZCRYPT_PCICC), 939 (int __user *) arg); 940 case Z90STAT_PCIXCCMCL2COUNT: 941 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2), 942 (int __user *) arg); 943 case Z90STAT_PCIXCCMCL3COUNT: 944 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL3), 945 (int __user *) arg); 946 case Z90STAT_PCIXCCCOUNT: 947 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2) + 948 zcrypt_count_type(ZCRYPT_PCIXCC_MCL3), 949 (int __user *) arg); 950 case Z90STAT_CEX2CCOUNT: 951 return put_user(zcrypt_count_type(ZCRYPT_CEX2C), 952 (int __user *) arg); 953 case Z90STAT_CEX2ACOUNT: 954 return put_user(zcrypt_count_type(ZCRYPT_CEX2A), 955 (int __user *) arg); 956 default: 957 /* unknown ioctl number */ 958 return -ENOIOCTLCMD; 959 } 960 } 961 962 #ifdef CONFIG_COMPAT 963 /* 964 * ioctl32 conversion routines 965 */ 966 struct compat_ica_rsa_modexpo { 967 compat_uptr_t inputdata; 968 unsigned int inputdatalength; 969 compat_uptr_t outputdata; 970 unsigned int outputdatalength; 971 compat_uptr_t b_key; 972 compat_uptr_t n_modulus; 973 }; 974 975 static long trans_modexpo32(struct file *filp, unsigned int cmd, 976 unsigned long arg) 977 { 978 struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg); 979 struct compat_ica_rsa_modexpo mex32; 980 struct ica_rsa_modexpo mex64; 981 long rc; 982 983 if (copy_from_user(&mex32, umex32, sizeof(mex32))) 984 return -EFAULT; 985 mex64.inputdata = compat_ptr(mex32.inputdata); 986 mex64.inputdatalength = mex32.inputdatalength; 987 mex64.outputdata = compat_ptr(mex32.outputdata); 988 mex64.outputdatalength = mex32.outputdatalength; 989 mex64.b_key = compat_ptr(mex32.b_key); 990 mex64.n_modulus = compat_ptr(mex32.n_modulus); 991 do { 992 rc = zcrypt_rsa_modexpo(&mex64); 993 } while (rc == -EAGAIN); 994 /* on failure: retry once again after a requested rescan */ 995 if ((rc == -ENODEV) && (zcrypt_process_rescan())) 996 do { 997 rc = zcrypt_rsa_modexpo(&mex64); 998 } while (rc == -EAGAIN); 999 if (rc) 1000 return rc; 1001 return put_user(mex64.outputdatalength, 1002 &umex32->outputdatalength); 1003 } 1004 1005 struct compat_ica_rsa_modexpo_crt { 1006 compat_uptr_t inputdata; 1007 unsigned int inputdatalength; 1008 compat_uptr_t outputdata; 1009 unsigned int outputdatalength; 1010 compat_uptr_t bp_key; 1011 compat_uptr_t bq_key; 1012 compat_uptr_t np_prime; 1013 compat_uptr_t nq_prime; 1014 compat_uptr_t u_mult_inv; 1015 }; 1016 1017 static long trans_modexpo_crt32(struct file *filp, unsigned int cmd, 1018 unsigned long arg) 1019 { 1020 struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg); 1021 struct compat_ica_rsa_modexpo_crt crt32; 1022 struct ica_rsa_modexpo_crt crt64; 1023 long rc; 1024 1025 if (copy_from_user(&crt32, ucrt32, sizeof(crt32))) 1026 return -EFAULT; 1027 crt64.inputdata = compat_ptr(crt32.inputdata); 1028 crt64.inputdatalength = crt32.inputdatalength; 1029 crt64.outputdata= compat_ptr(crt32.outputdata); 1030 crt64.outputdatalength = crt32.outputdatalength; 1031 crt64.bp_key = compat_ptr(crt32.bp_key); 1032 crt64.bq_key = compat_ptr(crt32.bq_key); 1033 crt64.np_prime = compat_ptr(crt32.np_prime); 1034 crt64.nq_prime = compat_ptr(crt32.nq_prime); 1035 crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv); 1036 do { 1037 rc = zcrypt_rsa_crt(&crt64); 1038 } while (rc == -EAGAIN); 1039 /* on failure: retry once again after a requested rescan */ 1040 if ((rc == -ENODEV) && (zcrypt_process_rescan())) 1041 do { 1042 rc = zcrypt_rsa_crt(&crt64); 1043 } while (rc == -EAGAIN); 1044 if (rc) 1045 return rc; 1046 return put_user(crt64.outputdatalength, 1047 &ucrt32->outputdatalength); 1048 } 1049 1050 struct compat_ica_xcRB { 1051 unsigned short agent_ID; 1052 unsigned int user_defined; 1053 unsigned short request_ID; 1054 unsigned int request_control_blk_length; 1055 unsigned char padding1[16 - sizeof (compat_uptr_t)]; 1056 compat_uptr_t request_control_blk_addr; 1057 unsigned int request_data_length; 1058 char padding2[16 - sizeof (compat_uptr_t)]; 1059 compat_uptr_t request_data_address; 1060 unsigned int reply_control_blk_length; 1061 char padding3[16 - sizeof (compat_uptr_t)]; 1062 compat_uptr_t reply_control_blk_addr; 1063 unsigned int reply_data_length; 1064 char padding4[16 - sizeof (compat_uptr_t)]; 1065 compat_uptr_t reply_data_addr; 1066 unsigned short priority_window; 1067 unsigned int status; 1068 } __attribute__((packed)); 1069 1070 static long trans_xcRB32(struct file *filp, unsigned int cmd, 1071 unsigned long arg) 1072 { 1073 struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg); 1074 struct compat_ica_xcRB xcRB32; 1075 struct ica_xcRB xcRB64; 1076 long rc; 1077 1078 if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32))) 1079 return -EFAULT; 1080 xcRB64.agent_ID = xcRB32.agent_ID; 1081 xcRB64.user_defined = xcRB32.user_defined; 1082 xcRB64.request_ID = xcRB32.request_ID; 1083 xcRB64.request_control_blk_length = 1084 xcRB32.request_control_blk_length; 1085 xcRB64.request_control_blk_addr = 1086 compat_ptr(xcRB32.request_control_blk_addr); 1087 xcRB64.request_data_length = 1088 xcRB32.request_data_length; 1089 xcRB64.request_data_address = 1090 compat_ptr(xcRB32.request_data_address); 1091 xcRB64.reply_control_blk_length = 1092 xcRB32.reply_control_blk_length; 1093 xcRB64.reply_control_blk_addr = 1094 compat_ptr(xcRB32.reply_control_blk_addr); 1095 xcRB64.reply_data_length = xcRB32.reply_data_length; 1096 xcRB64.reply_data_addr = 1097 compat_ptr(xcRB32.reply_data_addr); 1098 xcRB64.priority_window = xcRB32.priority_window; 1099 xcRB64.status = xcRB32.status; 1100 do { 1101 rc = zcrypt_send_cprb(&xcRB64); 1102 } while (rc == -EAGAIN); 1103 /* on failure: retry once again after a requested rescan */ 1104 if ((rc == -ENODEV) && (zcrypt_process_rescan())) 1105 do { 1106 rc = zcrypt_send_cprb(&xcRB64); 1107 } while (rc == -EAGAIN); 1108 xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length; 1109 xcRB32.reply_data_length = xcRB64.reply_data_length; 1110 xcRB32.status = xcRB64.status; 1111 if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32))) 1112 return -EFAULT; 1113 return rc; 1114 } 1115 1116 static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd, 1117 unsigned long arg) 1118 { 1119 if (cmd == ICARSAMODEXPO) 1120 return trans_modexpo32(filp, cmd, arg); 1121 if (cmd == ICARSACRT) 1122 return trans_modexpo_crt32(filp, cmd, arg); 1123 if (cmd == ZSECSENDCPRB) 1124 return trans_xcRB32(filp, cmd, arg); 1125 return zcrypt_unlocked_ioctl(filp, cmd, arg); 1126 } 1127 #endif 1128 1129 /* 1130 * Misc device file operations. 1131 */ 1132 static const struct file_operations zcrypt_fops = { 1133 .owner = THIS_MODULE, 1134 .read = zcrypt_read, 1135 .write = zcrypt_write, 1136 .unlocked_ioctl = zcrypt_unlocked_ioctl, 1137 #ifdef CONFIG_COMPAT 1138 .compat_ioctl = zcrypt_compat_ioctl, 1139 #endif 1140 .open = zcrypt_open, 1141 .release = zcrypt_release, 1142 .llseek = no_llseek, 1143 }; 1144 1145 /* 1146 * Misc device. 1147 */ 1148 static struct miscdevice zcrypt_misc_device = { 1149 .minor = MISC_DYNAMIC_MINOR, 1150 .name = "z90crypt", 1151 .fops = &zcrypt_fops, 1152 }; 1153 1154 /* 1155 * Deprecated /proc entry support. 1156 */ 1157 static struct proc_dir_entry *zcrypt_entry; 1158 1159 static void sprintcl(struct seq_file *m, unsigned char *addr, unsigned int len) 1160 { 1161 int i; 1162 1163 for (i = 0; i < len; i++) 1164 seq_printf(m, "%01x", (unsigned int) addr[i]); 1165 seq_putc(m, ' '); 1166 } 1167 1168 static void sprintrw(struct seq_file *m, unsigned char *addr, unsigned int len) 1169 { 1170 int inl, c, cx; 1171 1172 seq_printf(m, " "); 1173 inl = 0; 1174 for (c = 0; c < (len / 16); c++) { 1175 sprintcl(m, addr+inl, 16); 1176 inl += 16; 1177 } 1178 cx = len%16; 1179 if (cx) { 1180 sprintcl(m, addr+inl, cx); 1181 inl += cx; 1182 } 1183 seq_putc(m, '\n'); 1184 } 1185 1186 static void sprinthx(unsigned char *title, struct seq_file *m, 1187 unsigned char *addr, unsigned int len) 1188 { 1189 int inl, r, rx; 1190 1191 seq_printf(m, "\n%s\n", title); 1192 inl = 0; 1193 for (r = 0; r < (len / 64); r++) { 1194 sprintrw(m, addr+inl, 64); 1195 inl += 64; 1196 } 1197 rx = len % 64; 1198 if (rx) { 1199 sprintrw(m, addr+inl, rx); 1200 inl += rx; 1201 } 1202 seq_putc(m, '\n'); 1203 } 1204 1205 static void sprinthx4(unsigned char *title, struct seq_file *m, 1206 unsigned int *array, unsigned int len) 1207 { 1208 seq_printf(m, "\n%s\n", title); 1209 seq_hex_dump(m, " ", DUMP_PREFIX_NONE, 32, 4, array, len, false); 1210 seq_putc(m, '\n'); 1211 } 1212 1213 static int zcrypt_proc_show(struct seq_file *m, void *v) 1214 { 1215 char workarea[sizeof(int) * AP_DEVICES]; 1216 1217 seq_printf(m, "\nzcrypt version: %d.%d.%d\n", 1218 ZCRYPT_VERSION, ZCRYPT_RELEASE, ZCRYPT_VARIANT); 1219 seq_printf(m, "Cryptographic domain: %d\n", ap_domain_index); 1220 seq_printf(m, "Total device count: %d\n", zcrypt_device_count); 1221 seq_printf(m, "PCICA count: %d\n", zcrypt_count_type(ZCRYPT_PCICA)); 1222 seq_printf(m, "PCICC count: %d\n", zcrypt_count_type(ZCRYPT_PCICC)); 1223 seq_printf(m, "PCIXCC MCL2 count: %d\n", 1224 zcrypt_count_type(ZCRYPT_PCIXCC_MCL2)); 1225 seq_printf(m, "PCIXCC MCL3 count: %d\n", 1226 zcrypt_count_type(ZCRYPT_PCIXCC_MCL3)); 1227 seq_printf(m, "CEX2C count: %d\n", zcrypt_count_type(ZCRYPT_CEX2C)); 1228 seq_printf(m, "CEX2A count: %d\n", zcrypt_count_type(ZCRYPT_CEX2A)); 1229 seq_printf(m, "CEX3C count: %d\n", zcrypt_count_type(ZCRYPT_CEX3C)); 1230 seq_printf(m, "CEX3A count: %d\n", zcrypt_count_type(ZCRYPT_CEX3A)); 1231 seq_printf(m, "requestq count: %d\n", zcrypt_requestq_count()); 1232 seq_printf(m, "pendingq count: %d\n", zcrypt_pendingq_count()); 1233 seq_printf(m, "Total open handles: %d\n\n", 1234 atomic_read(&zcrypt_open_count)); 1235 zcrypt_status_mask(workarea); 1236 sprinthx("Online devices: 1=PCICA 2=PCICC 3=PCIXCC(MCL2) " 1237 "4=PCIXCC(MCL3) 5=CEX2C 6=CEX2A 7=CEX3C 8=CEX3A", 1238 m, workarea, AP_DEVICES); 1239 zcrypt_qdepth_mask(workarea); 1240 sprinthx("Waiting work element counts", m, workarea, AP_DEVICES); 1241 zcrypt_perdev_reqcnt((int *) workarea); 1242 sprinthx4("Per-device successfully completed request counts", 1243 m, (unsigned int *) workarea, AP_DEVICES); 1244 return 0; 1245 } 1246 1247 static int zcrypt_proc_open(struct inode *inode, struct file *file) 1248 { 1249 return single_open(file, zcrypt_proc_show, NULL); 1250 } 1251 1252 static void zcrypt_disable_card(int index) 1253 { 1254 struct zcrypt_device *zdev; 1255 1256 spin_lock_bh(&zcrypt_device_lock); 1257 list_for_each_entry(zdev, &zcrypt_device_list, list) 1258 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) { 1259 zdev->online = 0; 1260 ap_flush_queue(zdev->ap_dev); 1261 break; 1262 } 1263 spin_unlock_bh(&zcrypt_device_lock); 1264 } 1265 1266 static void zcrypt_enable_card(int index) 1267 { 1268 struct zcrypt_device *zdev; 1269 1270 spin_lock_bh(&zcrypt_device_lock); 1271 list_for_each_entry(zdev, &zcrypt_device_list, list) 1272 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) { 1273 zdev->online = 1; 1274 break; 1275 } 1276 spin_unlock_bh(&zcrypt_device_lock); 1277 } 1278 1279 static ssize_t zcrypt_proc_write(struct file *file, const char __user *buffer, 1280 size_t count, loff_t *pos) 1281 { 1282 unsigned char *lbuf, *ptr; 1283 size_t local_count; 1284 int j; 1285 1286 if (count <= 0) 1287 return 0; 1288 1289 #define LBUFSIZE 1200UL 1290 lbuf = kmalloc(LBUFSIZE, GFP_KERNEL); 1291 if (!lbuf) 1292 return 0; 1293 1294 local_count = min(LBUFSIZE - 1, count); 1295 if (copy_from_user(lbuf, buffer, local_count) != 0) { 1296 kfree(lbuf); 1297 return -EFAULT; 1298 } 1299 lbuf[local_count] = '\0'; 1300 1301 ptr = strstr(lbuf, "Online devices"); 1302 if (!ptr) 1303 goto out; 1304 ptr = strstr(ptr, "\n"); 1305 if (!ptr) 1306 goto out; 1307 ptr++; 1308 1309 if (strstr(ptr, "Waiting work element counts") == NULL) 1310 goto out; 1311 1312 for (j = 0; j < 64 && *ptr; ptr++) { 1313 /* 1314 * '0' for no device, '1' for PCICA, '2' for PCICC, 1315 * '3' for PCIXCC_MCL2, '4' for PCIXCC_MCL3, 1316 * '5' for CEX2C and '6' for CEX2A' 1317 * '7' for CEX3C and '8' for CEX3A 1318 */ 1319 if (*ptr >= '0' && *ptr <= '8') 1320 j++; 1321 else if (*ptr == 'd' || *ptr == 'D') 1322 zcrypt_disable_card(j++); 1323 else if (*ptr == 'e' || *ptr == 'E') 1324 zcrypt_enable_card(j++); 1325 else if (*ptr != ' ' && *ptr != '\t') 1326 break; 1327 } 1328 out: 1329 kfree(lbuf); 1330 return count; 1331 } 1332 1333 static const struct file_operations zcrypt_proc_fops = { 1334 .owner = THIS_MODULE, 1335 .open = zcrypt_proc_open, 1336 .read = seq_read, 1337 .llseek = seq_lseek, 1338 .release = single_release, 1339 .write = zcrypt_proc_write, 1340 }; 1341 1342 static int zcrypt_rng_device_count; 1343 static u32 *zcrypt_rng_buffer; 1344 static int zcrypt_rng_buffer_index; 1345 static DEFINE_MUTEX(zcrypt_rng_mutex); 1346 1347 static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data) 1348 { 1349 int rc; 1350 1351 /* 1352 * We don't need locking here because the RNG API guarantees serialized 1353 * read method calls. 1354 */ 1355 if (zcrypt_rng_buffer_index == 0) { 1356 rc = zcrypt_rng((char *) zcrypt_rng_buffer); 1357 /* on failure: retry once again after a requested rescan */ 1358 if ((rc == -ENODEV) && (zcrypt_process_rescan())) 1359 rc = zcrypt_rng((char *) zcrypt_rng_buffer); 1360 if (rc < 0) 1361 return -EIO; 1362 zcrypt_rng_buffer_index = rc / sizeof *data; 1363 } 1364 *data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index]; 1365 return sizeof *data; 1366 } 1367 1368 static struct hwrng zcrypt_rng_dev = { 1369 .name = "zcrypt", 1370 .data_read = zcrypt_rng_data_read, 1371 .quality = 990, 1372 }; 1373 1374 static int zcrypt_rng_device_add(void) 1375 { 1376 int rc = 0; 1377 1378 mutex_lock(&zcrypt_rng_mutex); 1379 if (zcrypt_rng_device_count == 0) { 1380 zcrypt_rng_buffer = (u32 *) get_zeroed_page(GFP_KERNEL); 1381 if (!zcrypt_rng_buffer) { 1382 rc = -ENOMEM; 1383 goto out; 1384 } 1385 zcrypt_rng_buffer_index = 0; 1386 if (!zcrypt_hwrng_seed) 1387 zcrypt_rng_dev.quality = 0; 1388 rc = hwrng_register(&zcrypt_rng_dev); 1389 if (rc) 1390 goto out_free; 1391 zcrypt_rng_device_count = 1; 1392 } else 1393 zcrypt_rng_device_count++; 1394 mutex_unlock(&zcrypt_rng_mutex); 1395 return 0; 1396 1397 out_free: 1398 free_page((unsigned long) zcrypt_rng_buffer); 1399 out: 1400 mutex_unlock(&zcrypt_rng_mutex); 1401 return rc; 1402 } 1403 1404 static void zcrypt_rng_device_remove(void) 1405 { 1406 mutex_lock(&zcrypt_rng_mutex); 1407 zcrypt_rng_device_count--; 1408 if (zcrypt_rng_device_count == 0) { 1409 hwrng_unregister(&zcrypt_rng_dev); 1410 free_page((unsigned long) zcrypt_rng_buffer); 1411 } 1412 mutex_unlock(&zcrypt_rng_mutex); 1413 } 1414 1415 int __init zcrypt_debug_init(void) 1416 { 1417 debugfs_root = debugfs_create_dir("zcrypt", NULL); 1418 1419 zcrypt_dbf_common = debug_register("zcrypt_common", 1, 1, 16); 1420 debug_register_view(zcrypt_dbf_common, &debug_hex_ascii_view); 1421 debug_set_level(zcrypt_dbf_common, DBF_ERR); 1422 1423 zcrypt_dbf_devices = debug_register("zcrypt_devices", 1, 1, 16); 1424 debug_register_view(zcrypt_dbf_devices, &debug_hex_ascii_view); 1425 debug_set_level(zcrypt_dbf_devices, DBF_ERR); 1426 1427 return 0; 1428 } 1429 1430 void zcrypt_debug_exit(void) 1431 { 1432 debugfs_remove(debugfs_root); 1433 if (zcrypt_dbf_common) 1434 debug_unregister(zcrypt_dbf_common); 1435 if (zcrypt_dbf_devices) 1436 debug_unregister(zcrypt_dbf_devices); 1437 } 1438 1439 /** 1440 * zcrypt_api_init(): Module initialization. 1441 * 1442 * The module initialization code. 1443 */ 1444 int __init zcrypt_api_init(void) 1445 { 1446 int rc; 1447 1448 rc = zcrypt_debug_init(); 1449 if (rc) 1450 goto out; 1451 1452 atomic_set(&zcrypt_rescan_req, 0); 1453 1454 /* Register the request sprayer. */ 1455 rc = misc_register(&zcrypt_misc_device); 1456 if (rc < 0) 1457 goto out; 1458 1459 /* Set up the proc file system */ 1460 zcrypt_entry = proc_create("driver/z90crypt", 0644, NULL, &zcrypt_proc_fops); 1461 if (!zcrypt_entry) { 1462 rc = -ENOMEM; 1463 goto out_misc; 1464 } 1465 1466 return 0; 1467 1468 out_misc: 1469 misc_deregister(&zcrypt_misc_device); 1470 out: 1471 return rc; 1472 } 1473 1474 /** 1475 * zcrypt_api_exit(): Module termination. 1476 * 1477 * The module termination code. 1478 */ 1479 void zcrypt_api_exit(void) 1480 { 1481 remove_proc_entry("driver/z90crypt", NULL); 1482 misc_deregister(&zcrypt_misc_device); 1483 zcrypt_debug_exit(); 1484 } 1485 1486 module_init(zcrypt_api_init); 1487 module_exit(zcrypt_api_exit); 1488