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