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staging: vt6655: MACvSaveContext use memcpy_fromio to read context.
[linux/fpc-iii.git] / drivers / s390 / crypto / zcrypt_api.c
blob5d3d04c040c2be15af34d6977d17c658e35aaad5
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);
Linux with added FPC-III support