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V4L/DVB (6715): ivtv: Remove unnecessary register update
[linux-2.6/verdex.git] / drivers / s390 / crypto / zcrypt_api.c
blobe3625a47a59638a168fdeaa72000a920adc8c1e6
1 /*
2 * linux/drivers/s390/crypto/zcrypt_api.c
3 *
4 * zcrypt 2.1.0
5 *
6 * Copyright (C) 2001, 2006 IBM Corporation
7 * Author(s): Robert Burroughs
8 * Eric Rossman (edrossma@us.ibm.com)
9 * Cornelia Huck <cornelia.huck@de.ibm.com>
10 *
11 * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
12 * Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
13 * Ralph Wuerthner <rwuerthn@de.ibm.com>
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2, or (at your option)
18 * any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 */
29
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/interrupt.h>
33 #include <linux/miscdevice.h>
34 #include <linux/fs.h>
35 #include <linux/proc_fs.h>
36 #include <linux/compat.h>
37 #include <asm/atomic.h>
38 #include <asm/uaccess.h>
39
40 #include "zcrypt_api.h"
41
42 /**
43 * Module description.
44 */
45 MODULE_AUTHOR("IBM Corporation");
46 MODULE_DESCRIPTION("Cryptographic Coprocessor interface, "
47 "Copyright 2001, 2006 IBM Corporation");
48 MODULE_LICENSE("GPL");
49
50 static DEFINE_SPINLOCK(zcrypt_device_lock);
51 static LIST_HEAD(zcrypt_device_list);
52 static int zcrypt_device_count = 0;
53 static atomic_t zcrypt_open_count = ATOMIC_INIT(0);
54
55 /**
56 * Device attributes common for all crypto devices.
57 */
58 static ssize_t zcrypt_type_show(struct device *dev,
59 struct device_attribute *attr, char *buf)
60 {
61 struct zcrypt_device *zdev = to_ap_dev(dev)->private;
62 return snprintf(buf, PAGE_SIZE, "%s\n", zdev->type_string);
63 }
64
65 static DEVICE_ATTR(type, 0444, zcrypt_type_show, NULL);
66
67 static ssize_t zcrypt_online_show(struct device *dev,
68 struct device_attribute *attr, char *buf)
69 {
70 struct zcrypt_device *zdev = to_ap_dev(dev)->private;
71 return snprintf(buf, PAGE_SIZE, "%d\n", zdev->online);
72 }
73
74 static ssize_t zcrypt_online_store(struct device *dev,
75 struct device_attribute *attr,
76 const char *buf, size_t count)
77 {
78 struct zcrypt_device *zdev = to_ap_dev(dev)->private;
79 int online;
80
81 if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
82 return -EINVAL;
83 zdev->online = online;
84 if (!online)
85 ap_flush_queue(zdev->ap_dev);
86 return count;
87 }
88
89 static DEVICE_ATTR(online, 0644, zcrypt_online_show, zcrypt_online_store);
90
91 static struct attribute * zcrypt_device_attrs[] = {
92 &dev_attr_type.attr,
93 &dev_attr_online.attr,
94 NULL,
95 };
96
97 static struct attribute_group zcrypt_device_attr_group = {
98 .attrs = zcrypt_device_attrs,
99 };
100
101 /**
102 * Move the device towards the head of the device list.
103 * Need to be called while holding the zcrypt device list lock.
104 * Note: cards with speed_rating of 0 are kept at the end of the list.
105 */
106 static void __zcrypt_increase_preference(struct zcrypt_device *zdev)
107 {
108 struct zcrypt_device *tmp;
109 struct list_head *l;
110
111 if (zdev->speed_rating == 0)
112 return;
113 for (l = zdev->list.prev; l != &zcrypt_device_list; l = l->prev) {
114 tmp = list_entry(l, struct zcrypt_device, list);
115 if ((tmp->request_count + 1) * tmp->speed_rating <=
116 (zdev->request_count + 1) * zdev->speed_rating &&
117 tmp->speed_rating != 0)
118 break;
119 }
120 if (l == zdev->list.prev)
121 return;
122 /* Move zdev behind l */
123 list_del(&zdev->list);
124 list_add(&zdev->list, l);
125 }
126
127 /**
128 * Move the device towards the tail of the device list.
129 * Need to be called while holding the zcrypt device list lock.
130 * Note: cards with speed_rating of 0 are kept at the end of the list.
131 */
132 static void __zcrypt_decrease_preference(struct zcrypt_device *zdev)
133 {
134 struct zcrypt_device *tmp;
135 struct list_head *l;
136
137 if (zdev->speed_rating == 0)
138 return;
139 for (l = zdev->list.next; l != &zcrypt_device_list; l = l->next) {
140 tmp = list_entry(l, struct zcrypt_device, list);
141 if ((tmp->request_count + 1) * tmp->speed_rating >
142 (zdev->request_count + 1) * zdev->speed_rating ||
143 tmp->speed_rating == 0)
144 break;
145 }
146 if (l == zdev->list.next)
147 return;
148 /* Move zdev before l */
149 list_del(&zdev->list);
150 list_add_tail(&zdev->list, l);
151 }
152
153 static void zcrypt_device_release(struct kref *kref)
154 {
155 struct zcrypt_device *zdev =
156 container_of(kref, struct zcrypt_device, refcount);
157 zcrypt_device_free(zdev);
158 }
159
160 void zcrypt_device_get(struct zcrypt_device *zdev)
161 {
162 kref_get(&zdev->refcount);
163 }
164 EXPORT_SYMBOL(zcrypt_device_get);
165
166 int zcrypt_device_put(struct zcrypt_device *zdev)
167 {
168 return kref_put(&zdev->refcount, zcrypt_device_release);
169 }
170 EXPORT_SYMBOL(zcrypt_device_put);
171
172 struct zcrypt_device *zcrypt_device_alloc(size_t max_response_size)
173 {
174 struct zcrypt_device *zdev;
175
176 zdev = kzalloc(sizeof(struct zcrypt_device), GFP_KERNEL);
177 if (!zdev)
178 return NULL;
179 zdev->reply.message = kmalloc(max_response_size, GFP_KERNEL);
180 if (!zdev->reply.message)
181 goto out_free;
182 zdev->reply.length = max_response_size;
183 spin_lock_init(&zdev->lock);
184 INIT_LIST_HEAD(&zdev->list);
185 return zdev;
186
187 out_free:
188 kfree(zdev);
189 return NULL;
190 }
191 EXPORT_SYMBOL(zcrypt_device_alloc);
192
193 void zcrypt_device_free(struct zcrypt_device *zdev)
194 {
195 kfree(zdev->reply.message);
196 kfree(zdev);
197 }
198 EXPORT_SYMBOL(zcrypt_device_free);
199
200 /**
201 * Register a crypto device.
202 */
203 int zcrypt_device_register(struct zcrypt_device *zdev)
204 {
205 int rc;
206
207 rc = sysfs_create_group(&zdev->ap_dev->device.kobj,
208 &zcrypt_device_attr_group);
209 if (rc)
210 goto out;
211 get_device(&zdev->ap_dev->device);
212 kref_init(&zdev->refcount);
213 spin_lock_bh(&zcrypt_device_lock);
214 zdev->online = 1; /* New devices are online by default. */
215 list_add_tail(&zdev->list, &zcrypt_device_list);
216 __zcrypt_increase_preference(zdev);
217 zcrypt_device_count++;
218 spin_unlock_bh(&zcrypt_device_lock);
219 out:
220 return rc;
221 }
222 EXPORT_SYMBOL(zcrypt_device_register);
223
224 /**
225 * Unregister a crypto device.
226 */
227 void zcrypt_device_unregister(struct zcrypt_device *zdev)
228 {
229 spin_lock_bh(&zcrypt_device_lock);
230 zcrypt_device_count--;
231 list_del_init(&zdev->list);
232 spin_unlock_bh(&zcrypt_device_lock);
233 sysfs_remove_group(&zdev->ap_dev->device.kobj,
234 &zcrypt_device_attr_group);
235 put_device(&zdev->ap_dev->device);
236 zcrypt_device_put(zdev);
237 }
238 EXPORT_SYMBOL(zcrypt_device_unregister);
239
240 /**
241 * zcrypt_read is not be supported beyond zcrypt 1.3.1
242 */
243 static ssize_t zcrypt_read(struct file *filp, char __user *buf,
244 size_t count, loff_t *f_pos)
245 {
246 return -EPERM;
247 }
248
249 /**
250 * Write is is not allowed
251 */
252 static ssize_t zcrypt_write(struct file *filp, const char __user *buf,
253 size_t count, loff_t *f_pos)
254 {
255 return -EPERM;
256 }
257
258 /**
259 * Device open/close functions to count number of users.
260 */
261 static int zcrypt_open(struct inode *inode, struct file *filp)
262 {
263 atomic_inc(&zcrypt_open_count);
264 return 0;
265 }
266
267 static int zcrypt_release(struct inode *inode, struct file *filp)
268 {
269 atomic_dec(&zcrypt_open_count);
270 return 0;
271 }
272
273 /**
274 * zcrypt ioctls.
275 */
276 static long zcrypt_rsa_modexpo(struct ica_rsa_modexpo *mex)
277 {
278 struct zcrypt_device *zdev;
279 int rc;
280
281 if (mex->outputdatalength < mex->inputdatalength)
282 return -EINVAL;
283 /**
284 * As long as outputdatalength is big enough, we can set the
285 * outputdatalength equal to the inputdatalength, since that is the
286 * number of bytes we will copy in any case
287 */
288 mex->outputdatalength = mex->inputdatalength;
289
290 spin_lock_bh(&zcrypt_device_lock);
291 list_for_each_entry(zdev, &zcrypt_device_list, list) {
292 if (!zdev->online ||
293 !zdev->ops->rsa_modexpo ||
294 zdev->min_mod_size > mex->inputdatalength ||
295 zdev->max_mod_size < mex->inputdatalength)
296 continue;
297 zcrypt_device_get(zdev);
298 get_device(&zdev->ap_dev->device);
299 zdev->request_count++;
300 __zcrypt_decrease_preference(zdev);
301 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
302 spin_unlock_bh(&zcrypt_device_lock);
303 rc = zdev->ops->rsa_modexpo(zdev, mex);
304 spin_lock_bh(&zcrypt_device_lock);
305 module_put(zdev->ap_dev->drv->driver.owner);
306 }
307 else
308 rc = -EAGAIN;
309 zdev->request_count--;
310 __zcrypt_increase_preference(zdev);
311 put_device(&zdev->ap_dev->device);
312 zcrypt_device_put(zdev);
313 spin_unlock_bh(&zcrypt_device_lock);
314 return rc;
315 }
316 spin_unlock_bh(&zcrypt_device_lock);
317 return -ENODEV;
318 }
319
320 static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt)
321 {
322 struct zcrypt_device *zdev;
323 unsigned long long z1, z2, z3;
324 int rc, copied;
325
326 if (crt->outputdatalength < crt->inputdatalength ||
327 (crt->inputdatalength & 1))
328 return -EINVAL;
329 /**
330 * As long as outputdatalength is big enough, we can set the
331 * outputdatalength equal to the inputdatalength, since that is the
332 * number of bytes we will copy in any case
333 */
334 crt->outputdatalength = crt->inputdatalength;
335
336 copied = 0;
337 restart:
338 spin_lock_bh(&zcrypt_device_lock);
339 list_for_each_entry(zdev, &zcrypt_device_list, list) {
340 if (!zdev->online ||
341 !zdev->ops->rsa_modexpo_crt ||
342 zdev->min_mod_size > crt->inputdatalength ||
343 zdev->max_mod_size < crt->inputdatalength)
344 continue;
345 if (zdev->short_crt && crt->inputdatalength > 240) {
346 /**
347 * Check inputdata for leading zeros for cards
348 * that can't handle np_prime, bp_key, or
349 * u_mult_inv > 128 bytes.
350 */
351 if (copied == 0) {
352 int len;
353 spin_unlock_bh(&zcrypt_device_lock);
354 /* len is max 256 / 2 - 120 = 8 */
355 len = crt->inputdatalength / 2 - 120;
356 z1 = z2 = z3 = 0;
357 if (copy_from_user(&z1, crt->np_prime, len) ||
358 copy_from_user(&z2, crt->bp_key, len) ||
359 copy_from_user(&z3, crt->u_mult_inv, len))
360 return -EFAULT;
361 copied = 1;
362 /**
363 * We have to restart device lookup -
364 * the device list may have changed by now.
365 */
366 goto restart;
367 }
368 if (z1 != 0ULL || z2 != 0ULL || z3 != 0ULL)
369 /* The device can't handle this request. */
370 continue;
371 }
372 zcrypt_device_get(zdev);
373 get_device(&zdev->ap_dev->device);
374 zdev->request_count++;
375 __zcrypt_decrease_preference(zdev);
376 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
377 spin_unlock_bh(&zcrypt_device_lock);
378 rc = zdev->ops->rsa_modexpo_crt(zdev, crt);
379 spin_lock_bh(&zcrypt_device_lock);
380 module_put(zdev->ap_dev->drv->driver.owner);
381 }
382 else
383 rc = -EAGAIN;
384 zdev->request_count--;
385 __zcrypt_increase_preference(zdev);
386 put_device(&zdev->ap_dev->device);
387 zcrypt_device_put(zdev);
388 spin_unlock_bh(&zcrypt_device_lock);
389 return rc;
390 }
391 spin_unlock_bh(&zcrypt_device_lock);
392 return -ENODEV;
393 }
394
395 static long zcrypt_send_cprb(struct ica_xcRB *xcRB)
396 {
397 struct zcrypt_device *zdev;
398 int rc;
399
400 spin_lock_bh(&zcrypt_device_lock);
401 list_for_each_entry(zdev, &zcrypt_device_list, list) {
402 if (!zdev->online || !zdev->ops->send_cprb ||
403 (xcRB->user_defined != AUTOSELECT &&
404 AP_QID_DEVICE(zdev->ap_dev->qid) != xcRB->user_defined)
405 )
406 continue;
407 zcrypt_device_get(zdev);
408 get_device(&zdev->ap_dev->device);
409 zdev->request_count++;
410 __zcrypt_decrease_preference(zdev);
411 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
412 spin_unlock_bh(&zcrypt_device_lock);
413 rc = zdev->ops->send_cprb(zdev, xcRB);
414 spin_lock_bh(&zcrypt_device_lock);
415 module_put(zdev->ap_dev->drv->driver.owner);
416 }
417 else
418 rc = -EAGAIN;
419 zdev->request_count--;
420 __zcrypt_increase_preference(zdev);
421 put_device(&zdev->ap_dev->device);
422 zcrypt_device_put(zdev);
423 spin_unlock_bh(&zcrypt_device_lock);
424 return rc;
425 }
426 spin_unlock_bh(&zcrypt_device_lock);
427 return -ENODEV;
428 }
429
430 static void zcrypt_status_mask(char status[AP_DEVICES])
431 {
432 struct zcrypt_device *zdev;
433
434 memset(status, 0, sizeof(char) * AP_DEVICES);
435 spin_lock_bh(&zcrypt_device_lock);
436 list_for_each_entry(zdev, &zcrypt_device_list, list)
437 status[AP_QID_DEVICE(zdev->ap_dev->qid)] =
438 zdev->online ? zdev->user_space_type : 0x0d;
439 spin_unlock_bh(&zcrypt_device_lock);
440 }
441
442 static void zcrypt_qdepth_mask(char qdepth[AP_DEVICES])
443 {
444 struct zcrypt_device *zdev;
445
446 memset(qdepth, 0, sizeof(char) * AP_DEVICES);
447 spin_lock_bh(&zcrypt_device_lock);
448 list_for_each_entry(zdev, &zcrypt_device_list, list) {
449 spin_lock(&zdev->ap_dev->lock);
450 qdepth[AP_QID_DEVICE(zdev->ap_dev->qid)] =
451 zdev->ap_dev->pendingq_count +
452 zdev->ap_dev->requestq_count;
453 spin_unlock(&zdev->ap_dev->lock);
454 }
455 spin_unlock_bh(&zcrypt_device_lock);
456 }
457
458 static void zcrypt_perdev_reqcnt(int reqcnt[AP_DEVICES])
459 {
460 struct zcrypt_device *zdev;
461
462 memset(reqcnt, 0, sizeof(int) * AP_DEVICES);
463 spin_lock_bh(&zcrypt_device_lock);
464 list_for_each_entry(zdev, &zcrypt_device_list, list) {
465 spin_lock(&zdev->ap_dev->lock);
466 reqcnt[AP_QID_DEVICE(zdev->ap_dev->qid)] =
467 zdev->ap_dev->total_request_count;
468 spin_unlock(&zdev->ap_dev->lock);
469 }
470 spin_unlock_bh(&zcrypt_device_lock);
471 }
472
473 static int zcrypt_pendingq_count(void)
474 {
475 struct zcrypt_device *zdev;
476 int pendingq_count = 0;
477
478 spin_lock_bh(&zcrypt_device_lock);
479 list_for_each_entry(zdev, &zcrypt_device_list, list) {
480 spin_lock(&zdev->ap_dev->lock);
481 pendingq_count += zdev->ap_dev->pendingq_count;
482 spin_unlock(&zdev->ap_dev->lock);
483 }
484 spin_unlock_bh(&zcrypt_device_lock);
485 return pendingq_count;
486 }
487
488 static int zcrypt_requestq_count(void)
489 {
490 struct zcrypt_device *zdev;
491 int requestq_count = 0;
492
493 spin_lock_bh(&zcrypt_device_lock);
494 list_for_each_entry(zdev, &zcrypt_device_list, list) {
495 spin_lock(&zdev->ap_dev->lock);
496 requestq_count += zdev->ap_dev->requestq_count;
497 spin_unlock(&zdev->ap_dev->lock);
498 }
499 spin_unlock_bh(&zcrypt_device_lock);
500 return requestq_count;
501 }
502
503 static int zcrypt_count_type(int type)
504 {
505 struct zcrypt_device *zdev;
506 int device_count = 0;
507
508 spin_lock_bh(&zcrypt_device_lock);
509 list_for_each_entry(zdev, &zcrypt_device_list, list)
510 if (zdev->user_space_type == type)
511 device_count++;
512 spin_unlock_bh(&zcrypt_device_lock);
513 return device_count;
514 }
515
516 /**
517 * Old, deprecated combi status call.
518 */
519 static long zcrypt_ica_status(struct file *filp, unsigned long arg)
520 {
521 struct ica_z90_status *pstat;
522 int ret;
523
524 pstat = kzalloc(sizeof(*pstat), GFP_KERNEL);
525 if (!pstat)
526 return -ENOMEM;
527 pstat->totalcount = zcrypt_device_count;
528 pstat->leedslitecount = zcrypt_count_type(ZCRYPT_PCICA);
529 pstat->leeds2count = zcrypt_count_type(ZCRYPT_PCICC);
530 pstat->requestqWaitCount = zcrypt_requestq_count();
531 pstat->pendingqWaitCount = zcrypt_pendingq_count();
532 pstat->totalOpenCount = atomic_read(&zcrypt_open_count);
533 pstat->cryptoDomain = ap_domain_index;
534 zcrypt_status_mask(pstat->status);
535 zcrypt_qdepth_mask(pstat->qdepth);
536 ret = 0;
537 if (copy_to_user((void __user *) arg, pstat, sizeof(*pstat)))
538 ret = -EFAULT;
539 kfree(pstat);
540 return ret;
541 }
542
543 static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
544 unsigned long arg)
545 {
546 int rc;
547
548 switch (cmd) {
549 case ICARSAMODEXPO: {
550 struct ica_rsa_modexpo __user *umex = (void __user *) arg;
551 struct ica_rsa_modexpo mex;
552 if (copy_from_user(&mex, umex, sizeof(mex)))
553 return -EFAULT;
554 do {
555 rc = zcrypt_rsa_modexpo(&mex);
556 } while (rc == -EAGAIN);
557 if (rc)
558 return rc;
559 return put_user(mex.outputdatalength, &umex->outputdatalength);
560 }
561 case ICARSACRT: {
562 struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg;
563 struct ica_rsa_modexpo_crt crt;
564 if (copy_from_user(&crt, ucrt, sizeof(crt)))
565 return -EFAULT;
566 do {
567 rc = zcrypt_rsa_crt(&crt);
568 } while (rc == -EAGAIN);
569 if (rc)
570 return rc;
571 return put_user(crt.outputdatalength, &ucrt->outputdatalength);
572 }
573 case ZSECSENDCPRB: {
574 struct ica_xcRB __user *uxcRB = (void __user *) arg;
575 struct ica_xcRB xcRB;
576 if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB)))
577 return -EFAULT;
578 do {
579 rc = zcrypt_send_cprb(&xcRB);
580 } while (rc == -EAGAIN);
581 if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB)))
582 return -EFAULT;
583 return rc;
584 }
585 case Z90STAT_STATUS_MASK: {
586 char status[AP_DEVICES];
587 zcrypt_status_mask(status);
588 if (copy_to_user((char __user *) arg, status,
589 sizeof(char) * AP_DEVICES))
590 return -EFAULT;
591 return 0;
592 }
593 case Z90STAT_QDEPTH_MASK: {
594 char qdepth[AP_DEVICES];
595 zcrypt_qdepth_mask(qdepth);
596 if (copy_to_user((char __user *) arg, qdepth,
597 sizeof(char) * AP_DEVICES))
598 return -EFAULT;
599 return 0;
600 }
601 case Z90STAT_PERDEV_REQCNT: {
602 int reqcnt[AP_DEVICES];
603 zcrypt_perdev_reqcnt(reqcnt);
604 if (copy_to_user((int __user *) arg, reqcnt,
605 sizeof(int) * AP_DEVICES))
606 return -EFAULT;
607 return 0;
608 }
609 case Z90STAT_REQUESTQ_COUNT:
610 return put_user(zcrypt_requestq_count(), (int __user *) arg);
611 case Z90STAT_PENDINGQ_COUNT:
612 return put_user(zcrypt_pendingq_count(), (int __user *) arg);
613 case Z90STAT_TOTALOPEN_COUNT:
614 return put_user(atomic_read(&zcrypt_open_count),
615 (int __user *) arg);
616 case Z90STAT_DOMAIN_INDEX:
617 return put_user(ap_domain_index, (int __user *) arg);
618 /**
619 * Deprecated ioctls. Don't add another device count ioctl,
620 * you can count them yourself in the user space with the
621 * output of the Z90STAT_STATUS_MASK ioctl.
622 */
623 case ICAZ90STATUS:
624 return zcrypt_ica_status(filp, arg);
625 case Z90STAT_TOTALCOUNT:
626 return put_user(zcrypt_device_count, (int __user *) arg);
627 case Z90STAT_PCICACOUNT:
628 return put_user(zcrypt_count_type(ZCRYPT_PCICA),
629 (int __user *) arg);
630 case Z90STAT_PCICCCOUNT:
631 return put_user(zcrypt_count_type(ZCRYPT_PCICC),
632 (int __user *) arg);
633 case Z90STAT_PCIXCCMCL2COUNT:
634 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2),
635 (int __user *) arg);
636 case Z90STAT_PCIXCCMCL3COUNT:
637 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
638 (int __user *) arg);
639 case Z90STAT_PCIXCCCOUNT:
640 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2) +
641 zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
642 (int __user *) arg);
643 case Z90STAT_CEX2CCOUNT:
644 return put_user(zcrypt_count_type(ZCRYPT_CEX2C),
645 (int __user *) arg);
646 case Z90STAT_CEX2ACOUNT:
647 return put_user(zcrypt_count_type(ZCRYPT_CEX2A),
648 (int __user *) arg);
649 default:
650 /* unknown ioctl number */
651 return -ENOIOCTLCMD;
652 }
653 }
654
655 #ifdef CONFIG_COMPAT
656 /**
657 * ioctl32 conversion routines
658 */
659 struct compat_ica_rsa_modexpo {
660 compat_uptr_t inputdata;
661 unsigned int inputdatalength;
662 compat_uptr_t outputdata;
663 unsigned int outputdatalength;
664 compat_uptr_t b_key;
665 compat_uptr_t n_modulus;
666 };
667
668 static long trans_modexpo32(struct file *filp, unsigned int cmd,
669 unsigned long arg)
670 {
671 struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg);
672 struct compat_ica_rsa_modexpo mex32;
673 struct ica_rsa_modexpo mex64;
674 long rc;
675
676 if (copy_from_user(&mex32, umex32, sizeof(mex32)))
677 return -EFAULT;
678 mex64.inputdata = compat_ptr(mex32.inputdata);
679 mex64.inputdatalength = mex32.inputdatalength;
680 mex64.outputdata = compat_ptr(mex32.outputdata);
681 mex64.outputdatalength = mex32.outputdatalength;
682 mex64.b_key = compat_ptr(mex32.b_key);
683 mex64.n_modulus = compat_ptr(mex32.n_modulus);
684 do {
685 rc = zcrypt_rsa_modexpo(&mex64);
686 } while (rc == -EAGAIN);
687 if (!rc)
688 rc = put_user(mex64.outputdatalength,
689 &umex32->outputdatalength);
690 return rc;
691 }
692
693 struct compat_ica_rsa_modexpo_crt {
694 compat_uptr_t inputdata;
695 unsigned int inputdatalength;
696 compat_uptr_t outputdata;
697 unsigned int outputdatalength;
698 compat_uptr_t bp_key;
699 compat_uptr_t bq_key;
700 compat_uptr_t np_prime;
701 compat_uptr_t nq_prime;
702 compat_uptr_t u_mult_inv;
703 };
704
705 static long trans_modexpo_crt32(struct file *filp, unsigned int cmd,
706 unsigned long arg)
707 {
708 struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg);
709 struct compat_ica_rsa_modexpo_crt crt32;
710 struct ica_rsa_modexpo_crt crt64;
711 long rc;
712
713 if (copy_from_user(&crt32, ucrt32, sizeof(crt32)))
714 return -EFAULT;
715 crt64.inputdata = compat_ptr(crt32.inputdata);
716 crt64.inputdatalength = crt32.inputdatalength;
717 crt64.outputdata= compat_ptr(crt32.outputdata);
718 crt64.outputdatalength = crt32.outputdatalength;
719 crt64.bp_key = compat_ptr(crt32.bp_key);
720 crt64.bq_key = compat_ptr(crt32.bq_key);
721 crt64.np_prime = compat_ptr(crt32.np_prime);
722 crt64.nq_prime = compat_ptr(crt32.nq_prime);
723 crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv);
724 do {
725 rc = zcrypt_rsa_crt(&crt64);
726 } while (rc == -EAGAIN);
727 if (!rc)
728 rc = put_user(crt64.outputdatalength,
729 &ucrt32->outputdatalength);
730 return rc;
731 }
732
733 struct compat_ica_xcRB {
734 unsigned short agent_ID;
735 unsigned int user_defined;
736 unsigned short request_ID;
737 unsigned int request_control_blk_length;
738 unsigned char padding1[16 - sizeof (compat_uptr_t)];
739 compat_uptr_t request_control_blk_addr;
740 unsigned int request_data_length;
741 char padding2[16 - sizeof (compat_uptr_t)];
742 compat_uptr_t request_data_address;
743 unsigned int reply_control_blk_length;
744 char padding3[16 - sizeof (compat_uptr_t)];
745 compat_uptr_t reply_control_blk_addr;
746 unsigned int reply_data_length;
747 char padding4[16 - sizeof (compat_uptr_t)];
748 compat_uptr_t reply_data_addr;
749 unsigned short priority_window;
750 unsigned int status;
751 } __attribute__((packed));
752
753 static long trans_xcRB32(struct file *filp, unsigned int cmd,
754 unsigned long arg)
755 {
756 struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg);
757 struct compat_ica_xcRB xcRB32;
758 struct ica_xcRB xcRB64;
759 long rc;
760
761 if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32)))
762 return -EFAULT;
763 xcRB64.agent_ID = xcRB32.agent_ID;
764 xcRB64.user_defined = xcRB32.user_defined;
765 xcRB64.request_ID = xcRB32.request_ID;
766 xcRB64.request_control_blk_length =
767 xcRB32.request_control_blk_length;
768 xcRB64.request_control_blk_addr =
769 compat_ptr(xcRB32.request_control_blk_addr);
770 xcRB64.request_data_length =
771 xcRB32.request_data_length;
772 xcRB64.request_data_address =
773 compat_ptr(xcRB32.request_data_address);
774 xcRB64.reply_control_blk_length =
775 xcRB32.reply_control_blk_length;
776 xcRB64.reply_control_blk_addr =
777 compat_ptr(xcRB32.reply_control_blk_addr);
778 xcRB64.reply_data_length = xcRB32.reply_data_length;
779 xcRB64.reply_data_addr =
780 compat_ptr(xcRB32.reply_data_addr);
781 xcRB64.priority_window = xcRB32.priority_window;
782 xcRB64.status = xcRB32.status;
783 do {
784 rc = zcrypt_send_cprb(&xcRB64);
785 } while (rc == -EAGAIN);
786 xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length;
787 xcRB32.reply_data_length = xcRB64.reply_data_length;
788 xcRB32.status = xcRB64.status;
789 if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32)))
790 return -EFAULT;
791 return rc;
792 }
793
794 static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd,
795 unsigned long arg)
796 {
797 if (cmd == ICARSAMODEXPO)
798 return trans_modexpo32(filp, cmd, arg);
799 if (cmd == ICARSACRT)
800 return trans_modexpo_crt32(filp, cmd, arg);
801 if (cmd == ZSECSENDCPRB)
802 return trans_xcRB32(filp, cmd, arg);
803 return zcrypt_unlocked_ioctl(filp, cmd, arg);
804 }
805 #endif
806
807 /**
808 * Misc device file operations.
809 */
810 static const struct file_operations zcrypt_fops = {
811 .owner = THIS_MODULE,
812 .read = zcrypt_read,
813 .write = zcrypt_write,
814 .unlocked_ioctl = zcrypt_unlocked_ioctl,
815 #ifdef CONFIG_COMPAT
816 .compat_ioctl = zcrypt_compat_ioctl,
817 #endif
818 .open = zcrypt_open,
819 .release = zcrypt_release
820 };
821
822 /**
823 * Misc device.
824 */
825 static struct miscdevice zcrypt_misc_device = {
826 .minor = MISC_DYNAMIC_MINOR,
827 .name = "z90crypt",
828 .fops = &zcrypt_fops,
829 };
830
831 /**
832 * Deprecated /proc entry support.
833 */
834 static struct proc_dir_entry *zcrypt_entry;
835
836 static int sprintcl(unsigned char *outaddr, unsigned char *addr,
837 unsigned int len)
838 {
839 int hl, i;
840
841 hl = 0;
842 for (i = 0; i < len; i++)
843 hl += sprintf(outaddr+hl, "%01x", (unsigned int) addr[i]);
844 hl += sprintf(outaddr+hl, " ");
845 return hl;
846 }
847
848 static int sprintrw(unsigned char *outaddr, unsigned char *addr,
849 unsigned int len)
850 {
851 int hl, inl, c, cx;
852
853 hl = sprintf(outaddr, " ");
854 inl = 0;
855 for (c = 0; c < (len / 16); c++) {
856 hl += sprintcl(outaddr+hl, addr+inl, 16);
857 inl += 16;
858 }
859 cx = len%16;
860 if (cx) {
861 hl += sprintcl(outaddr+hl, addr+inl, cx);
862 inl += cx;
863 }
864 hl += sprintf(outaddr+hl, "\n");
865 return hl;
866 }
867
868 static int sprinthx(unsigned char *title, unsigned char *outaddr,
869 unsigned char *addr, unsigned int len)
870 {
871 int hl, inl, r, rx;
872
873 hl = sprintf(outaddr, "\n%s\n", title);
874 inl = 0;
875 for (r = 0; r < (len / 64); r++) {
876 hl += sprintrw(outaddr+hl, addr+inl, 64);
877 inl += 64;
878 }
879 rx = len % 64;
880 if (rx) {
881 hl += sprintrw(outaddr+hl, addr+inl, rx);
882 inl += rx;
883 }
884 hl += sprintf(outaddr+hl, "\n");
885 return hl;
886 }
887
888 static int sprinthx4(unsigned char *title, unsigned char *outaddr,
889 unsigned int *array, unsigned int len)
890 {
891 int hl, r;
892
893 hl = sprintf(outaddr, "\n%s\n", title);
894 for (r = 0; r < len; r++) {
895 if ((r % 8) == 0)
896 hl += sprintf(outaddr+hl, " ");
897 hl += sprintf(outaddr+hl, "%08X ", array[r]);
898 if ((r % 8) == 7)
899 hl += sprintf(outaddr+hl, "\n");
900 }
901 hl += sprintf(outaddr+hl, "\n");
902 return hl;
903 }
904
905 static int zcrypt_status_read(char *resp_buff, char **start, off_t offset,
906 int count, int *eof, void *data)
907 {
908 unsigned char *workarea;
909 int len;
910
911 len = 0;
912
913 /* resp_buff is a page. Use the right half for a work area */
914 workarea = resp_buff + 2000;
915 len += sprintf(resp_buff + len, "\nzcrypt version: %d.%d.%d\n",
916 ZCRYPT_VERSION, ZCRYPT_RELEASE, ZCRYPT_VARIANT);
917 len += sprintf(resp_buff + len, "Cryptographic domain: %d\n",
918 ap_domain_index);
919 len += sprintf(resp_buff + len, "Total device count: %d\n",
920 zcrypt_device_count);
921 len += sprintf(resp_buff + len, "PCICA count: %d\n",
922 zcrypt_count_type(ZCRYPT_PCICA));
923 len += sprintf(resp_buff + len, "PCICC count: %d\n",
924 zcrypt_count_type(ZCRYPT_PCICC));
925 len += sprintf(resp_buff + len, "PCIXCC MCL2 count: %d\n",
926 zcrypt_count_type(ZCRYPT_PCIXCC_MCL2));
927 len += sprintf(resp_buff + len, "PCIXCC MCL3 count: %d\n",
928 zcrypt_count_type(ZCRYPT_PCIXCC_MCL3));
929 len += sprintf(resp_buff + len, "CEX2C count: %d\n",
930 zcrypt_count_type(ZCRYPT_CEX2C));
931 len += sprintf(resp_buff + len, "CEX2A count: %d\n",
932 zcrypt_count_type(ZCRYPT_CEX2A));
933 len += sprintf(resp_buff + len, "requestq count: %d\n",
934 zcrypt_requestq_count());
935 len += sprintf(resp_buff + len, "pendingq count: %d\n",
936 zcrypt_pendingq_count());
937 len += sprintf(resp_buff + len, "Total open handles: %d\n\n",
938 atomic_read(&zcrypt_open_count));
939 zcrypt_status_mask(workarea);
940 len += sprinthx("Online devices: 1=PCICA 2=PCICC 3=PCIXCC(MCL2) "
941 "4=PCIXCC(MCL3) 5=CEX2C 6=CEX2A",
942 resp_buff+len, workarea, AP_DEVICES);
943 zcrypt_qdepth_mask(workarea);
944 len += sprinthx("Waiting work element counts",
945 resp_buff+len, workarea, AP_DEVICES);
946 zcrypt_perdev_reqcnt((int *) workarea);
947 len += sprinthx4("Per-device successfully completed request counts",
948 resp_buff+len,(unsigned int *) workarea, AP_DEVICES);
949 *eof = 1;
950 memset((void *) workarea, 0x00, AP_DEVICES * sizeof(unsigned int));
951 return len;
952 }
953
954 static void zcrypt_disable_card(int index)
955 {
956 struct zcrypt_device *zdev;
957
958 spin_lock_bh(&zcrypt_device_lock);
959 list_for_each_entry(zdev, &zcrypt_device_list, list)
960 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
961 zdev->online = 0;
962 ap_flush_queue(zdev->ap_dev);
963 break;
964 }
965 spin_unlock_bh(&zcrypt_device_lock);
966 }
967
968 static void zcrypt_enable_card(int index)
969 {
970 struct zcrypt_device *zdev;
971
972 spin_lock_bh(&zcrypt_device_lock);
973 list_for_each_entry(zdev, &zcrypt_device_list, list)
974 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
975 zdev->online = 1;
976 break;
977 }
978 spin_unlock_bh(&zcrypt_device_lock);
979 }
980
981 static int zcrypt_status_write(struct file *file, const char __user *buffer,
982 unsigned long count, void *data)
983 {
984 unsigned char *lbuf, *ptr;
985 unsigned long local_count;
986 int j;
987
988 if (count <= 0)
989 return 0;
990
991 #define LBUFSIZE 1200UL
992 lbuf = kmalloc(LBUFSIZE, GFP_KERNEL);
993 if (!lbuf) {
994 PRINTK("kmalloc failed!\n");
995 return 0;
996 }
997
998 local_count = min(LBUFSIZE - 1, count);
999 if (copy_from_user(lbuf, buffer, local_count) != 0) {
1000 kfree(lbuf);
1001 return -EFAULT;
1002 }
1003 lbuf[local_count] = '\0';
1004
1005 ptr = strstr(lbuf, "Online devices");
1006 if (!ptr) {
1007 PRINTK("Unable to parse data (missing \"Online devices\")\n");
1008 goto out;
1009 }
1010 ptr = strstr(ptr, "\n");
1011 if (!ptr) {
1012 PRINTK("Unable to parse data (missing newline "
1013 "after \"Online devices\")\n");
1014 goto out;
1015 }
1016 ptr++;
1017
1018 if (strstr(ptr, "Waiting work element counts") == NULL) {
1019 PRINTK("Unable to parse data (missing "
1020 "\"Waiting work element counts\")\n");
1021 goto out;
1022 }
1023
1024 for (j = 0; j < 64 && *ptr; ptr++) {
1025 /**
1026 * '0' for no device, '1' for PCICA, '2' for PCICC,
1027 * '3' for PCIXCC_MCL2, '4' for PCIXCC_MCL3,
1028 * '5' for CEX2C and '6' for CEX2A'
1029 */
1030 if (*ptr >= '0' && *ptr <= '6')
1031 j++;
1032 else if (*ptr == 'd' || *ptr == 'D')
1033 zcrypt_disable_card(j++);
1034 else if (*ptr == 'e' || *ptr == 'E')
1035 zcrypt_enable_card(j++);
1036 else if (*ptr != ' ' && *ptr != '\t')
1037 break;
1038 }
1039 out:
1040 kfree(lbuf);
1041 return count;
1042 }
1043
1044 /**
1045 * The module initialization code.
1046 */
1047 int __init zcrypt_api_init(void)
1048 {
1049 int rc;
1050
1051 /* Register the request sprayer. */
1052 rc = misc_register(&zcrypt_misc_device);
1053 if (rc < 0) {
1054 PRINTKW(KERN_ERR "misc_register (minor %d) failed with %d\n",
1055 zcrypt_misc_device.minor, rc);
1056 goto out;
1057 }
1058
1059 /* Set up the proc file system */
1060 zcrypt_entry = create_proc_entry("driver/z90crypt", 0644, NULL);
1061 if (!zcrypt_entry) {
1062 PRINTK("Couldn't create z90crypt proc entry\n");
1063 rc = -ENOMEM;
1064 goto out_misc;
1065 }
1066 zcrypt_entry->data = NULL;
1067 zcrypt_entry->read_proc = zcrypt_status_read;
1068 zcrypt_entry->write_proc = zcrypt_status_write;
1069
1070 return 0;
1071
1072 out_misc:
1073 misc_deregister(&zcrypt_misc_device);
1074 out:
1075 return rc;
1076 }
1077
1078 /**
1079 * The module termination code.
1080 */
1081 void zcrypt_api_exit(void)
1082 {
1083 remove_proc_entry("driver/z90crypt", NULL);
1084 misc_deregister(&zcrypt_misc_device);
1085 }
1086
1087 #ifndef CONFIG_ZCRYPT_MONOLITHIC
1088 module_init(zcrypt_api_init);
1089 module_exit(zcrypt_api_exit);
1090 #endif
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