Merge branch 'for-rmk/samsung6' of git://git.fluff.org/bjdooks/linux into devel-stable
[linux-2.6.git] / drivers / s390 / crypto / zcrypt_api.c
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 <linux/smp_lock.h>
38 #include <asm/atomic.h>
39 #include <asm/uaccess.h>
40 #include <linux/hw_random.h>
41
42 #include "zcrypt_api.h"
43
44 /*
45  * Module description.
46  */
47 MODULE_AUTHOR("IBM Corporation");
48 MODULE_DESCRIPTION("Cryptographic Coprocessor interface, "
49                    "Copyright 2001, 2006 IBM Corporation");
50 MODULE_LICENSE("GPL");
51
52 static DEFINE_SPINLOCK(zcrypt_device_lock);
53 static LIST_HEAD(zcrypt_device_list);
54 static int zcrypt_device_count = 0;
55 static atomic_t zcrypt_open_count = ATOMIC_INIT(0);
56
57 static int zcrypt_rng_device_add(void);
58 static void zcrypt_rng_device_remove(void);
59
60 /*
61  * Device attributes common for all crypto devices.
62  */
63 static ssize_t zcrypt_type_show(struct device *dev,
64                                 struct device_attribute *attr, char *buf)
65 {
66         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
67         return snprintf(buf, PAGE_SIZE, "%s\n", zdev->type_string);
68 }
69
70 static DEVICE_ATTR(type, 0444, zcrypt_type_show, NULL);
71
72 static ssize_t zcrypt_online_show(struct device *dev,
73                                   struct device_attribute *attr, char *buf)
74 {
75         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
76         return snprintf(buf, PAGE_SIZE, "%d\n", zdev->online);
77 }
78
79 static ssize_t zcrypt_online_store(struct device *dev,
80                                    struct device_attribute *attr,
81                                    const char *buf, size_t count)
82 {
83         struct zcrypt_device *zdev = to_ap_dev(dev)->private;
84         int online;
85
86         if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
87                 return -EINVAL;
88         zdev->online = online;
89         if (!online)
90                 ap_flush_queue(zdev->ap_dev);
91         return count;
92 }
93
94 static DEVICE_ATTR(online, 0644, zcrypt_online_show, zcrypt_online_store);
95
96 static struct attribute * zcrypt_device_attrs[] = {
97         &dev_attr_type.attr,
98         &dev_attr_online.attr,
99         NULL,
100 };
101
102 static struct attribute_group zcrypt_device_attr_group = {
103         .attrs = zcrypt_device_attrs,
104 };
105
106 /**
107  * __zcrypt_increase_preference(): Increase preference of a crypto device.
108  * @zdev: Pointer the crypto device
109  *
110  * Move the device towards the head of the device list.
111  * Need to be called while holding the zcrypt device list lock.
112  * Note: cards with speed_rating of 0 are kept at the end of the list.
113  */
114 static void __zcrypt_increase_preference(struct zcrypt_device *zdev)
115 {
116         struct zcrypt_device *tmp;
117         struct list_head *l;
118
119         if (zdev->speed_rating == 0)
120                 return;
121         for (l = zdev->list.prev; l != &zcrypt_device_list; l = l->prev) {
122                 tmp = list_entry(l, struct zcrypt_device, list);
123                 if ((tmp->request_count + 1) * tmp->speed_rating <=
124                     (zdev->request_count + 1) * zdev->speed_rating &&
125                     tmp->speed_rating != 0)
126                         break;
127         }
128         if (l == zdev->list.prev)
129                 return;
130         /* Move zdev behind l */
131         list_move(&zdev->list, l);
132 }
133
134 /**
135  * __zcrypt_decrease_preference(): Decrease preference of a crypto device.
136  * @zdev: Pointer to a crypto device.
137  *
138  * Move the device towards the tail of the device list.
139  * Need to be called while holding the zcrypt device list lock.
140  * Note: cards with speed_rating of 0 are kept at the end of the list.
141  */
142 static void __zcrypt_decrease_preference(struct zcrypt_device *zdev)
143 {
144         struct zcrypt_device *tmp;
145         struct list_head *l;
146
147         if (zdev->speed_rating == 0)
148                 return;
149         for (l = zdev->list.next; l != &zcrypt_device_list; l = l->next) {
150                 tmp = list_entry(l, struct zcrypt_device, list);
151                 if ((tmp->request_count + 1) * tmp->speed_rating >
152                     (zdev->request_count + 1) * zdev->speed_rating ||
153                     tmp->speed_rating == 0)
154                         break;
155         }
156         if (l == zdev->list.next)
157                 return;
158         /* Move zdev before l */
159         list_move_tail(&zdev->list, l);
160 }
161
162 static void zcrypt_device_release(struct kref *kref)
163 {
164         struct zcrypt_device *zdev =
165                 container_of(kref, struct zcrypt_device, refcount);
166         zcrypt_device_free(zdev);
167 }
168
169 void zcrypt_device_get(struct zcrypt_device *zdev)
170 {
171         kref_get(&zdev->refcount);
172 }
173 EXPORT_SYMBOL(zcrypt_device_get);
174
175 int zcrypt_device_put(struct zcrypt_device *zdev)
176 {
177         return kref_put(&zdev->refcount, zcrypt_device_release);
178 }
179 EXPORT_SYMBOL(zcrypt_device_put);
180
181 struct zcrypt_device *zcrypt_device_alloc(size_t max_response_size)
182 {
183         struct zcrypt_device *zdev;
184
185         zdev = kzalloc(sizeof(struct zcrypt_device), GFP_KERNEL);
186         if (!zdev)
187                 return NULL;
188         zdev->reply.message = kmalloc(max_response_size, GFP_KERNEL);
189         if (!zdev->reply.message)
190                 goto out_free;
191         zdev->reply.length = max_response_size;
192         spin_lock_init(&zdev->lock);
193         INIT_LIST_HEAD(&zdev->list);
194         return zdev;
195
196 out_free:
197         kfree(zdev);
198         return NULL;
199 }
200 EXPORT_SYMBOL(zcrypt_device_alloc);
201
202 void zcrypt_device_free(struct zcrypt_device *zdev)
203 {
204         kfree(zdev->reply.message);
205         kfree(zdev);
206 }
207 EXPORT_SYMBOL(zcrypt_device_free);
208
209 /**
210  * zcrypt_device_register() - Register a crypto device.
211  * @zdev: Pointer to a crypto device
212  *
213  * Register a crypto device. Returns 0 if successful.
214  */
215 int zcrypt_device_register(struct zcrypt_device *zdev)
216 {
217         int rc;
218
219         rc = sysfs_create_group(&zdev->ap_dev->device.kobj,
220                                 &zcrypt_device_attr_group);
221         if (rc)
222                 goto out;
223         get_device(&zdev->ap_dev->device);
224         kref_init(&zdev->refcount);
225         spin_lock_bh(&zcrypt_device_lock);
226         zdev->online = 1;       /* New devices are online by default. */
227         list_add_tail(&zdev->list, &zcrypt_device_list);
228         __zcrypt_increase_preference(zdev);
229         zcrypt_device_count++;
230         spin_unlock_bh(&zcrypt_device_lock);
231         if (zdev->ops->rng) {
232                 rc = zcrypt_rng_device_add();
233                 if (rc)
234                         goto out_unregister;
235         }
236         return 0;
237
238 out_unregister:
239         spin_lock_bh(&zcrypt_device_lock);
240         zcrypt_device_count--;
241         list_del_init(&zdev->list);
242         spin_unlock_bh(&zcrypt_device_lock);
243         sysfs_remove_group(&zdev->ap_dev->device.kobj,
244                            &zcrypt_device_attr_group);
245         put_device(&zdev->ap_dev->device);
246         zcrypt_device_put(zdev);
247 out:
248         return rc;
249 }
250 EXPORT_SYMBOL(zcrypt_device_register);
251
252 /**
253  * zcrypt_device_unregister(): Unregister a crypto device.
254  * @zdev: Pointer to crypto device
255  *
256  * Unregister a crypto device.
257  */
258 void zcrypt_device_unregister(struct zcrypt_device *zdev)
259 {
260         if (zdev->ops->rng)
261                 zcrypt_rng_device_remove();
262         spin_lock_bh(&zcrypt_device_lock);
263         zcrypt_device_count--;
264         list_del_init(&zdev->list);
265         spin_unlock_bh(&zcrypt_device_lock);
266         sysfs_remove_group(&zdev->ap_dev->device.kobj,
267                            &zcrypt_device_attr_group);
268         put_device(&zdev->ap_dev->device);
269         zcrypt_device_put(zdev);
270 }
271 EXPORT_SYMBOL(zcrypt_device_unregister);
272
273 /**
274  * zcrypt_read (): Not supported beyond zcrypt 1.3.1.
275  *
276  * This function is not supported beyond zcrypt 1.3.1.
277  */
278 static ssize_t zcrypt_read(struct file *filp, char __user *buf,
279                            size_t count, loff_t *f_pos)
280 {
281         return -EPERM;
282 }
283
284 /**
285  * zcrypt_write(): Not allowed.
286  *
287  * Write is is not allowed
288  */
289 static ssize_t zcrypt_write(struct file *filp, const char __user *buf,
290                             size_t count, loff_t *f_pos)
291 {
292         return -EPERM;
293 }
294
295 /**
296  * zcrypt_open(): Count number of users.
297  *
298  * Device open function to count number of users.
299  */
300 static int zcrypt_open(struct inode *inode, struct file *filp)
301 {
302         atomic_inc(&zcrypt_open_count);
303         return 0;
304 }
305
306 /**
307  * zcrypt_release(): Count number of users.
308  *
309  * Device close function to count number of users.
310  */
311 static int zcrypt_release(struct inode *inode, struct file *filp)
312 {
313         atomic_dec(&zcrypt_open_count);
314         return 0;
315 }
316
317 /*
318  * zcrypt ioctls.
319  */
320 static long zcrypt_rsa_modexpo(struct ica_rsa_modexpo *mex)
321 {
322         struct zcrypt_device *zdev;
323         int rc;
324
325         if (mex->outputdatalength < mex->inputdatalength)
326                 return -EINVAL;
327         /*
328          * As long as outputdatalength is big enough, we can set the
329          * outputdatalength equal to the inputdatalength, since that is the
330          * number of bytes we will copy in any case
331          */
332         mex->outputdatalength = mex->inputdatalength;
333
334         spin_lock_bh(&zcrypt_device_lock);
335         list_for_each_entry(zdev, &zcrypt_device_list, list) {
336                 if (!zdev->online ||
337                     !zdev->ops->rsa_modexpo ||
338                     zdev->min_mod_size > mex->inputdatalength ||
339                     zdev->max_mod_size < mex->inputdatalength)
340                         continue;
341                 zcrypt_device_get(zdev);
342                 get_device(&zdev->ap_dev->device);
343                 zdev->request_count++;
344                 __zcrypt_decrease_preference(zdev);
345                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
346                         spin_unlock_bh(&zcrypt_device_lock);
347                         rc = zdev->ops->rsa_modexpo(zdev, mex);
348                         spin_lock_bh(&zcrypt_device_lock);
349                         module_put(zdev->ap_dev->drv->driver.owner);
350                 }
351                 else
352                         rc = -EAGAIN;
353                 zdev->request_count--;
354                 __zcrypt_increase_preference(zdev);
355                 put_device(&zdev->ap_dev->device);
356                 zcrypt_device_put(zdev);
357                 spin_unlock_bh(&zcrypt_device_lock);
358                 return rc;
359         }
360         spin_unlock_bh(&zcrypt_device_lock);
361         return -ENODEV;
362 }
363
364 static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt)
365 {
366         struct zcrypt_device *zdev;
367         unsigned long long z1, z2, z3;
368         int rc, copied;
369
370         if (crt->outputdatalength < crt->inputdatalength ||
371             (crt->inputdatalength & 1))
372                 return -EINVAL;
373         /*
374          * As long as outputdatalength is big enough, we can set the
375          * outputdatalength equal to the inputdatalength, since that is the
376          * number of bytes we will copy in any case
377          */
378         crt->outputdatalength = crt->inputdatalength;
379
380         copied = 0;
381  restart:
382         spin_lock_bh(&zcrypt_device_lock);
383         list_for_each_entry(zdev, &zcrypt_device_list, list) {
384                 if (!zdev->online ||
385                     !zdev->ops->rsa_modexpo_crt ||
386                     zdev->min_mod_size > crt->inputdatalength ||
387                     zdev->max_mod_size < crt->inputdatalength)
388                         continue;
389                 if (zdev->short_crt && crt->inputdatalength > 240) {
390                         /*
391                          * Check inputdata for leading zeros for cards
392                          * that can't handle np_prime, bp_key, or
393                          * u_mult_inv > 128 bytes.
394                          */
395                         if (copied == 0) {
396                                 unsigned int len;
397                                 spin_unlock_bh(&zcrypt_device_lock);
398                                 /* len is max 256 / 2 - 120 = 8 */
399                                 len = crt->inputdatalength / 2 - 120;
400                                 if (len > sizeof(z1))
401                                         return -EFAULT;
402                                 z1 = z2 = z3 = 0;
403                                 if (copy_from_user(&z1, crt->np_prime, len) ||
404                                     copy_from_user(&z2, crt->bp_key, len) ||
405                                     copy_from_user(&z3, crt->u_mult_inv, len))
406                                         return -EFAULT;
407                                 copied = 1;
408                                 /*
409                                  * We have to restart device lookup -
410                                  * the device list may have changed by now.
411                                  */
412                                 goto restart;
413                         }
414                         if (z1 != 0ULL || z2 != 0ULL || z3 != 0ULL)
415                                 /* The device can't handle this request. */
416                                 continue;
417                 }
418                 zcrypt_device_get(zdev);
419                 get_device(&zdev->ap_dev->device);
420                 zdev->request_count++;
421                 __zcrypt_decrease_preference(zdev);
422                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
423                         spin_unlock_bh(&zcrypt_device_lock);
424                         rc = zdev->ops->rsa_modexpo_crt(zdev, crt);
425                         spin_lock_bh(&zcrypt_device_lock);
426                         module_put(zdev->ap_dev->drv->driver.owner);
427                 }
428                 else
429                         rc = -EAGAIN;
430                 zdev->request_count--;
431                 __zcrypt_increase_preference(zdev);
432                 put_device(&zdev->ap_dev->device);
433                 zcrypt_device_put(zdev);
434                 spin_unlock_bh(&zcrypt_device_lock);
435                 return rc;
436         }
437         spin_unlock_bh(&zcrypt_device_lock);
438         return -ENODEV;
439 }
440
441 static long zcrypt_send_cprb(struct ica_xcRB *xcRB)
442 {
443         struct zcrypt_device *zdev;
444         int rc;
445
446         spin_lock_bh(&zcrypt_device_lock);
447         list_for_each_entry(zdev, &zcrypt_device_list, list) {
448                 if (!zdev->online || !zdev->ops->send_cprb ||
449                     (xcRB->user_defined != AUTOSELECT &&
450                         AP_QID_DEVICE(zdev->ap_dev->qid) != xcRB->user_defined)
451                     )
452                         continue;
453                 zcrypt_device_get(zdev);
454                 get_device(&zdev->ap_dev->device);
455                 zdev->request_count++;
456                 __zcrypt_decrease_preference(zdev);
457                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
458                         spin_unlock_bh(&zcrypt_device_lock);
459                         rc = zdev->ops->send_cprb(zdev, xcRB);
460                         spin_lock_bh(&zcrypt_device_lock);
461                         module_put(zdev->ap_dev->drv->driver.owner);
462                 }
463                 else
464                         rc = -EAGAIN;
465                 zdev->request_count--;
466                 __zcrypt_increase_preference(zdev);
467                 put_device(&zdev->ap_dev->device);
468                 zcrypt_device_put(zdev);
469                 spin_unlock_bh(&zcrypt_device_lock);
470                 return rc;
471         }
472         spin_unlock_bh(&zcrypt_device_lock);
473         return -ENODEV;
474 }
475
476 static long zcrypt_rng(char *buffer)
477 {
478         struct zcrypt_device *zdev;
479         int rc;
480
481         spin_lock_bh(&zcrypt_device_lock);
482         list_for_each_entry(zdev, &zcrypt_device_list, list) {
483                 if (!zdev->online || !zdev->ops->rng)
484                         continue;
485                 zcrypt_device_get(zdev);
486                 get_device(&zdev->ap_dev->device);
487                 zdev->request_count++;
488                 __zcrypt_decrease_preference(zdev);
489                 if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
490                         spin_unlock_bh(&zcrypt_device_lock);
491                         rc = zdev->ops->rng(zdev, buffer);
492                         spin_lock_bh(&zcrypt_device_lock);
493                         module_put(zdev->ap_dev->drv->driver.owner);
494                 } else
495                         rc = -EAGAIN;
496                 zdev->request_count--;
497                 __zcrypt_increase_preference(zdev);
498                 put_device(&zdev->ap_dev->device);
499                 zcrypt_device_put(zdev);
500                 spin_unlock_bh(&zcrypt_device_lock);
501                 return rc;
502         }
503         spin_unlock_bh(&zcrypt_device_lock);
504         return -ENODEV;
505 }
506
507 static void zcrypt_status_mask(char status[AP_DEVICES])
508 {
509         struct zcrypt_device *zdev;
510
511         memset(status, 0, sizeof(char) * AP_DEVICES);
512         spin_lock_bh(&zcrypt_device_lock);
513         list_for_each_entry(zdev, &zcrypt_device_list, list)
514                 status[AP_QID_DEVICE(zdev->ap_dev->qid)] =
515                         zdev->online ? zdev->user_space_type : 0x0d;
516         spin_unlock_bh(&zcrypt_device_lock);
517 }
518
519 static void zcrypt_qdepth_mask(char qdepth[AP_DEVICES])
520 {
521         struct zcrypt_device *zdev;
522
523         memset(qdepth, 0, sizeof(char)  * AP_DEVICES);
524         spin_lock_bh(&zcrypt_device_lock);
525         list_for_each_entry(zdev, &zcrypt_device_list, list) {
526                 spin_lock(&zdev->ap_dev->lock);
527                 qdepth[AP_QID_DEVICE(zdev->ap_dev->qid)] =
528                         zdev->ap_dev->pendingq_count +
529                         zdev->ap_dev->requestq_count;
530                 spin_unlock(&zdev->ap_dev->lock);
531         }
532         spin_unlock_bh(&zcrypt_device_lock);
533 }
534
535 static void zcrypt_perdev_reqcnt(int reqcnt[AP_DEVICES])
536 {
537         struct zcrypt_device *zdev;
538
539         memset(reqcnt, 0, sizeof(int) * AP_DEVICES);
540         spin_lock_bh(&zcrypt_device_lock);
541         list_for_each_entry(zdev, &zcrypt_device_list, list) {
542                 spin_lock(&zdev->ap_dev->lock);
543                 reqcnt[AP_QID_DEVICE(zdev->ap_dev->qid)] =
544                         zdev->ap_dev->total_request_count;
545                 spin_unlock(&zdev->ap_dev->lock);
546         }
547         spin_unlock_bh(&zcrypt_device_lock);
548 }
549
550 static int zcrypt_pendingq_count(void)
551 {
552         struct zcrypt_device *zdev;
553         int pendingq_count = 0;
554
555         spin_lock_bh(&zcrypt_device_lock);
556         list_for_each_entry(zdev, &zcrypt_device_list, list) {
557                 spin_lock(&zdev->ap_dev->lock);
558                 pendingq_count += zdev->ap_dev->pendingq_count;
559                 spin_unlock(&zdev->ap_dev->lock);
560         }
561         spin_unlock_bh(&zcrypt_device_lock);
562         return pendingq_count;
563 }
564
565 static int zcrypt_requestq_count(void)
566 {
567         struct zcrypt_device *zdev;
568         int requestq_count = 0;
569
570         spin_lock_bh(&zcrypt_device_lock);
571         list_for_each_entry(zdev, &zcrypt_device_list, list) {
572                 spin_lock(&zdev->ap_dev->lock);
573                 requestq_count += zdev->ap_dev->requestq_count;
574                 spin_unlock(&zdev->ap_dev->lock);
575         }
576         spin_unlock_bh(&zcrypt_device_lock);
577         return requestq_count;
578 }
579
580 static int zcrypt_count_type(int type)
581 {
582         struct zcrypt_device *zdev;
583         int device_count = 0;
584
585         spin_lock_bh(&zcrypt_device_lock);
586         list_for_each_entry(zdev, &zcrypt_device_list, list)
587                 if (zdev->user_space_type == type)
588                         device_count++;
589         spin_unlock_bh(&zcrypt_device_lock);
590         return device_count;
591 }
592
593 /**
594  * zcrypt_ica_status(): Old, depracted combi status call.
595  *
596  * Old, deprecated combi status call.
597  */
598 static long zcrypt_ica_status(struct file *filp, unsigned long arg)
599 {
600         struct ica_z90_status *pstat;
601         int ret;
602
603         pstat = kzalloc(sizeof(*pstat), GFP_KERNEL);
604         if (!pstat)
605                 return -ENOMEM;
606         pstat->totalcount = zcrypt_device_count;
607         pstat->leedslitecount = zcrypt_count_type(ZCRYPT_PCICA);
608         pstat->leeds2count = zcrypt_count_type(ZCRYPT_PCICC);
609         pstat->requestqWaitCount = zcrypt_requestq_count();
610         pstat->pendingqWaitCount = zcrypt_pendingq_count();
611         pstat->totalOpenCount = atomic_read(&zcrypt_open_count);
612         pstat->cryptoDomain = ap_domain_index;
613         zcrypt_status_mask(pstat->status);
614         zcrypt_qdepth_mask(pstat->qdepth);
615         ret = 0;
616         if (copy_to_user((void __user *) arg, pstat, sizeof(*pstat)))
617                 ret = -EFAULT;
618         kfree(pstat);
619         return ret;
620 }
621
622 static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
623                                   unsigned long arg)
624 {
625         int rc;
626
627         switch (cmd) {
628         case ICARSAMODEXPO: {
629                 struct ica_rsa_modexpo __user *umex = (void __user *) arg;
630                 struct ica_rsa_modexpo mex;
631                 if (copy_from_user(&mex, umex, sizeof(mex)))
632                         return -EFAULT;
633                 do {
634                         rc = zcrypt_rsa_modexpo(&mex);
635                 } while (rc == -EAGAIN);
636                 if (rc)
637                         return rc;
638                 return put_user(mex.outputdatalength, &umex->outputdatalength);
639         }
640         case ICARSACRT: {
641                 struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg;
642                 struct ica_rsa_modexpo_crt crt;
643                 if (copy_from_user(&crt, ucrt, sizeof(crt)))
644                         return -EFAULT;
645                 do {
646                         rc = zcrypt_rsa_crt(&crt);
647                 } while (rc == -EAGAIN);
648                 if (rc)
649                         return rc;
650                 return put_user(crt.outputdatalength, &ucrt->outputdatalength);
651         }
652         case ZSECSENDCPRB: {
653                 struct ica_xcRB __user *uxcRB = (void __user *) arg;
654                 struct ica_xcRB xcRB;
655                 if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB)))
656                         return -EFAULT;
657                 do {
658                         rc = zcrypt_send_cprb(&xcRB);
659                 } while (rc == -EAGAIN);
660                 if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB)))
661                         return -EFAULT;
662                 return rc;
663         }
664         case Z90STAT_STATUS_MASK: {
665                 char status[AP_DEVICES];
666                 zcrypt_status_mask(status);
667                 if (copy_to_user((char __user *) arg, status,
668                                  sizeof(char) * AP_DEVICES))
669                         return -EFAULT;
670                 return 0;
671         }
672         case Z90STAT_QDEPTH_MASK: {
673                 char qdepth[AP_DEVICES];
674                 zcrypt_qdepth_mask(qdepth);
675                 if (copy_to_user((char __user *) arg, qdepth,
676                                  sizeof(char) * AP_DEVICES))
677                         return -EFAULT;
678                 return 0;
679         }
680         case Z90STAT_PERDEV_REQCNT: {
681                 int reqcnt[AP_DEVICES];
682                 zcrypt_perdev_reqcnt(reqcnt);
683                 if (copy_to_user((int __user *) arg, reqcnt,
684                                  sizeof(int) * AP_DEVICES))
685                         return -EFAULT;
686                 return 0;
687         }
688         case Z90STAT_REQUESTQ_COUNT:
689                 return put_user(zcrypt_requestq_count(), (int __user *) arg);
690         case Z90STAT_PENDINGQ_COUNT:
691                 return put_user(zcrypt_pendingq_count(), (int __user *) arg);
692         case Z90STAT_TOTALOPEN_COUNT:
693                 return put_user(atomic_read(&zcrypt_open_count),
694                                 (int __user *) arg);
695         case Z90STAT_DOMAIN_INDEX:
696                 return put_user(ap_domain_index, (int __user *) arg);
697         /*
698          * Deprecated ioctls. Don't add another device count ioctl,
699          * you can count them yourself in the user space with the
700          * output of the Z90STAT_STATUS_MASK ioctl.
701          */
702         case ICAZ90STATUS:
703                 return zcrypt_ica_status(filp, arg);
704         case Z90STAT_TOTALCOUNT:
705                 return put_user(zcrypt_device_count, (int __user *) arg);
706         case Z90STAT_PCICACOUNT:
707                 return put_user(zcrypt_count_type(ZCRYPT_PCICA),
708                                 (int __user *) arg);
709         case Z90STAT_PCICCCOUNT:
710                 return put_user(zcrypt_count_type(ZCRYPT_PCICC),
711                                 (int __user *) arg);
712         case Z90STAT_PCIXCCMCL2COUNT:
713                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2),
714                                 (int __user *) arg);
715         case Z90STAT_PCIXCCMCL3COUNT:
716                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
717                                 (int __user *) arg);
718         case Z90STAT_PCIXCCCOUNT:
719                 return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2) +
720                                 zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
721                                 (int __user *) arg);
722         case Z90STAT_CEX2CCOUNT:
723                 return put_user(zcrypt_count_type(ZCRYPT_CEX2C),
724                                 (int __user *) arg);
725         case Z90STAT_CEX2ACOUNT:
726                 return put_user(zcrypt_count_type(ZCRYPT_CEX2A),
727                                 (int __user *) arg);
728         default:
729                 /* unknown ioctl number */
730                 return -ENOIOCTLCMD;
731         }
732 }
733
734 #ifdef CONFIG_COMPAT
735 /*
736  * ioctl32 conversion routines
737  */
738 struct compat_ica_rsa_modexpo {
739         compat_uptr_t   inputdata;
740         unsigned int    inputdatalength;
741         compat_uptr_t   outputdata;
742         unsigned int    outputdatalength;
743         compat_uptr_t   b_key;
744         compat_uptr_t   n_modulus;
745 };
746
747 static long trans_modexpo32(struct file *filp, unsigned int cmd,
748                             unsigned long arg)
749 {
750         struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg);
751         struct compat_ica_rsa_modexpo mex32;
752         struct ica_rsa_modexpo mex64;
753         long rc;
754
755         if (copy_from_user(&mex32, umex32, sizeof(mex32)))
756                 return -EFAULT;
757         mex64.inputdata = compat_ptr(mex32.inputdata);
758         mex64.inputdatalength = mex32.inputdatalength;
759         mex64.outputdata = compat_ptr(mex32.outputdata);
760         mex64.outputdatalength = mex32.outputdatalength;
761         mex64.b_key = compat_ptr(mex32.b_key);
762         mex64.n_modulus = compat_ptr(mex32.n_modulus);
763         do {
764                 rc = zcrypt_rsa_modexpo(&mex64);
765         } while (rc == -EAGAIN);
766         if (!rc)
767                 rc = put_user(mex64.outputdatalength,
768                               &umex32->outputdatalength);
769         return rc;
770 }
771
772 struct compat_ica_rsa_modexpo_crt {
773         compat_uptr_t   inputdata;
774         unsigned int    inputdatalength;
775         compat_uptr_t   outputdata;
776         unsigned int    outputdatalength;
777         compat_uptr_t   bp_key;
778         compat_uptr_t   bq_key;
779         compat_uptr_t   np_prime;
780         compat_uptr_t   nq_prime;
781         compat_uptr_t   u_mult_inv;
782 };
783
784 static long trans_modexpo_crt32(struct file *filp, unsigned int cmd,
785                                 unsigned long arg)
786 {
787         struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg);
788         struct compat_ica_rsa_modexpo_crt crt32;
789         struct ica_rsa_modexpo_crt crt64;
790         long rc;
791
792         if (copy_from_user(&crt32, ucrt32, sizeof(crt32)))
793                 return -EFAULT;
794         crt64.inputdata = compat_ptr(crt32.inputdata);
795         crt64.inputdatalength = crt32.inputdatalength;
796         crt64.outputdata=  compat_ptr(crt32.outputdata);
797         crt64.outputdatalength = crt32.outputdatalength;
798         crt64.bp_key = compat_ptr(crt32.bp_key);
799         crt64.bq_key = compat_ptr(crt32.bq_key);
800         crt64.np_prime = compat_ptr(crt32.np_prime);
801         crt64.nq_prime = compat_ptr(crt32.nq_prime);
802         crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv);
803         do {
804                 rc = zcrypt_rsa_crt(&crt64);
805         } while (rc == -EAGAIN);
806         if (!rc)
807                 rc = put_user(crt64.outputdatalength,
808                               &ucrt32->outputdatalength);
809         return rc;
810 }
811
812 struct compat_ica_xcRB {
813         unsigned short  agent_ID;
814         unsigned int    user_defined;
815         unsigned short  request_ID;
816         unsigned int    request_control_blk_length;
817         unsigned char   padding1[16 - sizeof (compat_uptr_t)];
818         compat_uptr_t   request_control_blk_addr;
819         unsigned int    request_data_length;
820         char            padding2[16 - sizeof (compat_uptr_t)];
821         compat_uptr_t   request_data_address;
822         unsigned int    reply_control_blk_length;
823         char            padding3[16 - sizeof (compat_uptr_t)];
824         compat_uptr_t   reply_control_blk_addr;
825         unsigned int    reply_data_length;
826         char            padding4[16 - sizeof (compat_uptr_t)];
827         compat_uptr_t   reply_data_addr;
828         unsigned short  priority_window;
829         unsigned int    status;
830 } __attribute__((packed));
831
832 static long trans_xcRB32(struct file *filp, unsigned int cmd,
833                          unsigned long arg)
834 {
835         struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg);
836         struct compat_ica_xcRB xcRB32;
837         struct ica_xcRB xcRB64;
838         long rc;
839
840         if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32)))
841                 return -EFAULT;
842         xcRB64.agent_ID = xcRB32.agent_ID;
843         xcRB64.user_defined = xcRB32.user_defined;
844         xcRB64.request_ID = xcRB32.request_ID;
845         xcRB64.request_control_blk_length =
846                 xcRB32.request_control_blk_length;
847         xcRB64.request_control_blk_addr =
848                 compat_ptr(xcRB32.request_control_blk_addr);
849         xcRB64.request_data_length =
850                 xcRB32.request_data_length;
851         xcRB64.request_data_address =
852                 compat_ptr(xcRB32.request_data_address);
853         xcRB64.reply_control_blk_length =
854                 xcRB32.reply_control_blk_length;
855         xcRB64.reply_control_blk_addr =
856                 compat_ptr(xcRB32.reply_control_blk_addr);
857         xcRB64.reply_data_length = xcRB32.reply_data_length;
858         xcRB64.reply_data_addr =
859                 compat_ptr(xcRB32.reply_data_addr);
860         xcRB64.priority_window = xcRB32.priority_window;
861         xcRB64.status = xcRB32.status;
862         do {
863                 rc = zcrypt_send_cprb(&xcRB64);
864         } while (rc == -EAGAIN);
865         xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length;
866         xcRB32.reply_data_length = xcRB64.reply_data_length;
867         xcRB32.status = xcRB64.status;
868         if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32)))
869                         return -EFAULT;
870         return rc;
871 }
872
873 static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd,
874                          unsigned long arg)
875 {
876         if (cmd == ICARSAMODEXPO)
877                 return trans_modexpo32(filp, cmd, arg);
878         if (cmd == ICARSACRT)
879                 return trans_modexpo_crt32(filp, cmd, arg);
880         if (cmd == ZSECSENDCPRB)
881                 return trans_xcRB32(filp, cmd, arg);
882         return zcrypt_unlocked_ioctl(filp, cmd, arg);
883 }
884 #endif
885
886 /*
887  * Misc device file operations.
888  */
889 static const struct file_operations zcrypt_fops = {
890         .owner          = THIS_MODULE,
891         .read           = zcrypt_read,
892         .write          = zcrypt_write,
893         .unlocked_ioctl = zcrypt_unlocked_ioctl,
894 #ifdef CONFIG_COMPAT
895         .compat_ioctl   = zcrypt_compat_ioctl,
896 #endif
897         .open           = zcrypt_open,
898         .release        = zcrypt_release
899 };
900
901 /*
902  * Misc device.
903  */
904 static struct miscdevice zcrypt_misc_device = {
905         .minor      = MISC_DYNAMIC_MINOR,
906         .name       = "z90crypt",
907         .fops       = &zcrypt_fops,
908 };
909
910 /*
911  * Deprecated /proc entry support.
912  */
913 static struct proc_dir_entry *zcrypt_entry;
914
915 static int sprintcl(unsigned char *outaddr, unsigned char *addr,
916                     unsigned int len)
917 {
918         int hl, i;
919
920         hl = 0;
921         for (i = 0; i < len; i++)
922                 hl += sprintf(outaddr+hl, "%01x", (unsigned int) addr[i]);
923         hl += sprintf(outaddr+hl, " ");
924         return hl;
925 }
926
927 static int sprintrw(unsigned char *outaddr, unsigned char *addr,
928                     unsigned int len)
929 {
930         int hl, inl, c, cx;
931
932         hl = sprintf(outaddr, "    ");
933         inl = 0;
934         for (c = 0; c < (len / 16); c++) {
935                 hl += sprintcl(outaddr+hl, addr+inl, 16);
936                 inl += 16;
937         }
938         cx = len%16;
939         if (cx) {
940                 hl += sprintcl(outaddr+hl, addr+inl, cx);
941                 inl += cx;
942         }
943         hl += sprintf(outaddr+hl, "\n");
944         return hl;
945 }
946
947 static int sprinthx(unsigned char *title, unsigned char *outaddr,
948                     unsigned char *addr, unsigned int len)
949 {
950         int hl, inl, r, rx;
951
952         hl = sprintf(outaddr, "\n%s\n", title);
953         inl = 0;
954         for (r = 0; r < (len / 64); r++) {
955                 hl += sprintrw(outaddr+hl, addr+inl, 64);
956                 inl += 64;
957         }
958         rx = len % 64;
959         if (rx) {
960                 hl += sprintrw(outaddr+hl, addr+inl, rx);
961                 inl += rx;
962         }
963         hl += sprintf(outaddr+hl, "\n");
964         return hl;
965 }
966
967 static int sprinthx4(unsigned char *title, unsigned char *outaddr,
968                      unsigned int *array, unsigned int len)
969 {
970         int hl, r;
971
972         hl = sprintf(outaddr, "\n%s\n", title);
973         for (r = 0; r < len; r++) {
974                 if ((r % 8) == 0)
975                         hl += sprintf(outaddr+hl, "    ");
976                 hl += sprintf(outaddr+hl, "%08X ", array[r]);
977                 if ((r % 8) == 7)
978                         hl += sprintf(outaddr+hl, "\n");
979         }
980         hl += sprintf(outaddr+hl, "\n");
981         return hl;
982 }
983
984 static int zcrypt_status_read(char *resp_buff, char **start, off_t offset,
985                               int count, int *eof, void *data)
986 {
987         unsigned char *workarea;
988         int len;
989
990         len = 0;
991
992         /* resp_buff is a page. Use the right half for a work area */
993         workarea = resp_buff + 2000;
994         len += sprintf(resp_buff + len, "\nzcrypt version: %d.%d.%d\n",
995                 ZCRYPT_VERSION, ZCRYPT_RELEASE, ZCRYPT_VARIANT);
996         len += sprintf(resp_buff + len, "Cryptographic domain: %d\n",
997                        ap_domain_index);
998         len += sprintf(resp_buff + len, "Total device count: %d\n",
999                        zcrypt_device_count);
1000         len += sprintf(resp_buff + len, "PCICA count: %d\n",
1001                        zcrypt_count_type(ZCRYPT_PCICA));
1002         len += sprintf(resp_buff + len, "PCICC count: %d\n",
1003                        zcrypt_count_type(ZCRYPT_PCICC));
1004         len += sprintf(resp_buff + len, "PCIXCC MCL2 count: %d\n",
1005                        zcrypt_count_type(ZCRYPT_PCIXCC_MCL2));
1006         len += sprintf(resp_buff + len, "PCIXCC MCL3 count: %d\n",
1007                        zcrypt_count_type(ZCRYPT_PCIXCC_MCL3));
1008         len += sprintf(resp_buff + len, "CEX2C count: %d\n",
1009                        zcrypt_count_type(ZCRYPT_CEX2C));
1010         len += sprintf(resp_buff + len, "CEX2A count: %d\n",
1011                        zcrypt_count_type(ZCRYPT_CEX2A));
1012         len += sprintf(resp_buff + len, "CEX3C count: %d\n",
1013                        zcrypt_count_type(ZCRYPT_CEX3C));
1014         len += sprintf(resp_buff + len, "CEX3A count: %d\n",
1015                        zcrypt_count_type(ZCRYPT_CEX3A));
1016         len += sprintf(resp_buff + len, "requestq count: %d\n",
1017                        zcrypt_requestq_count());
1018         len += sprintf(resp_buff + len, "pendingq count: %d\n",
1019                        zcrypt_pendingq_count());
1020         len += sprintf(resp_buff + len, "Total open handles: %d\n\n",
1021                        atomic_read(&zcrypt_open_count));
1022         zcrypt_status_mask(workarea);
1023         len += sprinthx("Online devices: 1=PCICA 2=PCICC 3=PCIXCC(MCL2) "
1024                         "4=PCIXCC(MCL3) 5=CEX2C 6=CEX2A 7=CEX3C 8=CEX3A",
1025                         resp_buff+len, workarea, AP_DEVICES);
1026         zcrypt_qdepth_mask(workarea);
1027         len += sprinthx("Waiting work element counts",
1028                         resp_buff+len, workarea, AP_DEVICES);
1029         zcrypt_perdev_reqcnt((int *) workarea);
1030         len += sprinthx4("Per-device successfully completed request counts",
1031                          resp_buff+len,(unsigned int *) workarea, AP_DEVICES);
1032         *eof = 1;
1033         memset((void *) workarea, 0x00, AP_DEVICES * sizeof(unsigned int));
1034         return len;
1035 }
1036
1037 static void zcrypt_disable_card(int index)
1038 {
1039         struct zcrypt_device *zdev;
1040
1041         spin_lock_bh(&zcrypt_device_lock);
1042         list_for_each_entry(zdev, &zcrypt_device_list, list)
1043                 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
1044                         zdev->online = 0;
1045                         ap_flush_queue(zdev->ap_dev);
1046                         break;
1047                 }
1048         spin_unlock_bh(&zcrypt_device_lock);
1049 }
1050
1051 static void zcrypt_enable_card(int index)
1052 {
1053         struct zcrypt_device *zdev;
1054
1055         spin_lock_bh(&zcrypt_device_lock);
1056         list_for_each_entry(zdev, &zcrypt_device_list, list)
1057                 if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
1058                         zdev->online = 1;
1059                         break;
1060                 }
1061         spin_unlock_bh(&zcrypt_device_lock);
1062 }
1063
1064 static int zcrypt_status_write(struct file *file, const char __user *buffer,
1065                                unsigned long count, void *data)
1066 {
1067         unsigned char *lbuf, *ptr;
1068         unsigned long local_count;
1069         int j;
1070
1071         if (count <= 0)
1072                 return 0;
1073
1074 #define LBUFSIZE 1200UL
1075         lbuf = kmalloc(LBUFSIZE, GFP_KERNEL);
1076         if (!lbuf)
1077                 return 0;
1078
1079         local_count = min(LBUFSIZE - 1, count);
1080         if (copy_from_user(lbuf, buffer, local_count) != 0) {
1081                 kfree(lbuf);
1082                 return -EFAULT;
1083         }
1084         lbuf[local_count] = '\0';
1085
1086         ptr = strstr(lbuf, "Online devices");
1087         if (!ptr)
1088                 goto out;
1089         ptr = strstr(ptr, "\n");
1090         if (!ptr)
1091                 goto out;
1092         ptr++;
1093
1094         if (strstr(ptr, "Waiting work element counts") == NULL)
1095                 goto out;
1096
1097         for (j = 0; j < 64 && *ptr; ptr++) {
1098                 /*
1099                  * '0' for no device, '1' for PCICA, '2' for PCICC,
1100                  * '3' for PCIXCC_MCL2, '4' for PCIXCC_MCL3,
1101                  * '5' for CEX2C and '6' for CEX2A'
1102                  * '7' for CEX3C and '8' for CEX3A
1103                  */
1104                 if (*ptr >= '0' && *ptr <= '8')
1105                         j++;
1106                 else if (*ptr == 'd' || *ptr == 'D')
1107                         zcrypt_disable_card(j++);
1108                 else if (*ptr == 'e' || *ptr == 'E')
1109                         zcrypt_enable_card(j++);
1110                 else if (*ptr != ' ' && *ptr != '\t')
1111                         break;
1112         }
1113 out:
1114         kfree(lbuf);
1115         return count;
1116 }
1117
1118 static int zcrypt_rng_device_count;
1119 static u32 *zcrypt_rng_buffer;
1120 static int zcrypt_rng_buffer_index;
1121 static DEFINE_MUTEX(zcrypt_rng_mutex);
1122
1123 static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
1124 {
1125         int rc;
1126
1127         /*
1128          * We don't need locking here because the RNG API guarantees serialized
1129          * read method calls.
1130          */
1131         if (zcrypt_rng_buffer_index == 0) {
1132                 rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1133                 if (rc < 0)
1134                         return -EIO;
1135                 zcrypt_rng_buffer_index = rc / sizeof *data;
1136         }
1137         *data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index];
1138         return sizeof *data;
1139 }
1140
1141 static struct hwrng zcrypt_rng_dev = {
1142         .name           = "zcrypt",
1143         .data_read      = zcrypt_rng_data_read,
1144 };
1145
1146 static int zcrypt_rng_device_add(void)
1147 {
1148         int rc = 0;
1149
1150         mutex_lock(&zcrypt_rng_mutex);
1151         if (zcrypt_rng_device_count == 0) {
1152                 zcrypt_rng_buffer = (u32 *) get_zeroed_page(GFP_KERNEL);
1153                 if (!zcrypt_rng_buffer) {
1154                         rc = -ENOMEM;
1155                         goto out;
1156                 }
1157                 zcrypt_rng_buffer_index = 0;
1158                 rc = hwrng_register(&zcrypt_rng_dev);
1159                 if (rc)
1160                         goto out_free;
1161                 zcrypt_rng_device_count = 1;
1162         } else
1163                 zcrypt_rng_device_count++;
1164         mutex_unlock(&zcrypt_rng_mutex);
1165         return 0;
1166
1167 out_free:
1168         free_page((unsigned long) zcrypt_rng_buffer);
1169 out:
1170         mutex_unlock(&zcrypt_rng_mutex);
1171         return rc;
1172 }
1173
1174 static void zcrypt_rng_device_remove(void)
1175 {
1176         mutex_lock(&zcrypt_rng_mutex);
1177         zcrypt_rng_device_count--;
1178         if (zcrypt_rng_device_count == 0) {
1179                 hwrng_unregister(&zcrypt_rng_dev);
1180                 free_page((unsigned long) zcrypt_rng_buffer);
1181         }
1182         mutex_unlock(&zcrypt_rng_mutex);
1183 }
1184
1185 /**
1186  * zcrypt_api_init(): Module initialization.
1187  *
1188  * The module initialization code.
1189  */
1190 int __init zcrypt_api_init(void)
1191 {
1192         int rc;
1193
1194         /* Register the request sprayer. */
1195         rc = misc_register(&zcrypt_misc_device);
1196         if (rc < 0)
1197                 goto out;
1198
1199         /* Set up the proc file system */
1200         zcrypt_entry = create_proc_entry("driver/z90crypt", 0644, NULL);
1201         if (!zcrypt_entry) {
1202                 rc = -ENOMEM;
1203                 goto out_misc;
1204         }
1205         zcrypt_entry->data = NULL;
1206         zcrypt_entry->read_proc = zcrypt_status_read;
1207         zcrypt_entry->write_proc = zcrypt_status_write;
1208
1209         return 0;
1210
1211 out_misc:
1212         misc_deregister(&zcrypt_misc_device);
1213 out:
1214         return rc;
1215 }
1216
1217 /**
1218  * zcrypt_api_exit(): Module termination.
1219  *
1220  * The module termination code.
1221  */
1222 void zcrypt_api_exit(void)
1223 {
1224         remove_proc_entry("driver/z90crypt", NULL);
1225         misc_deregister(&zcrypt_misc_device);
1226 }
1227
1228 #ifndef CONFIG_ZCRYPT_MONOLITHIC
1229 module_init(zcrypt_api_init);
1230 module_exit(zcrypt_api_exit);
1231 #endif