xref: /openbmc/linux/drivers/s390/crypto/zcrypt_api.c (revision 7d94ab16)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  *  Copyright IBM Corp. 2001, 2018
4  *  Author(s): Robert Burroughs
5  *	       Eric Rossman (edrossma@us.ibm.com)
6  *	       Cornelia Huck <cornelia.huck@de.ibm.com>
7  *
8  *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
9  *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
10  *				  Ralph Wuerthner <rwuerthn@de.ibm.com>
11  *  MSGTYPE restruct:		  Holger Dengler <hd@linux.vnet.ibm.com>
12  *  Multiple device nodes: Harald Freudenberger <freude@linux.ibm.com>
13  */
14 
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/miscdevice.h>
19 #include <linux/fs.h>
20 #include <linux/compat.h>
21 #include <linux/slab.h>
22 #include <linux/atomic.h>
23 #include <linux/uaccess.h>
24 #include <linux/hw_random.h>
25 #include <linux/debugfs.h>
26 #include <linux/cdev.h>
27 #include <linux/ctype.h>
28 #include <asm/debug.h>
29 
30 #define CREATE_TRACE_POINTS
31 #include <asm/trace/zcrypt.h>
32 
33 #include "zcrypt_api.h"
34 #include "zcrypt_debug.h"
35 
36 #include "zcrypt_msgtype6.h"
37 #include "zcrypt_msgtype50.h"
38 #include "zcrypt_ccamisc.h"
39 #include "zcrypt_ep11misc.h"
40 
41 /*
42  * Module description.
43  */
44 MODULE_AUTHOR("IBM Corporation");
45 MODULE_DESCRIPTION("Cryptographic Coprocessor interface, " \
46 		   "Copyright IBM Corp. 2001, 2012");
47 MODULE_LICENSE("GPL");
48 
49 /*
50  * zcrypt tracepoint functions
51  */
52 EXPORT_TRACEPOINT_SYMBOL(s390_zcrypt_req);
53 EXPORT_TRACEPOINT_SYMBOL(s390_zcrypt_rep);
54 
55 static int zcrypt_hwrng_seed = 1;
56 module_param_named(hwrng_seed, zcrypt_hwrng_seed, int, 0440);
57 MODULE_PARM_DESC(hwrng_seed, "Turn on/off hwrng auto seed, default is 1 (on).");
58 
59 DEFINE_SPINLOCK(zcrypt_list_lock);
60 LIST_HEAD(zcrypt_card_list);
61 int zcrypt_device_count;
62 
63 static atomic_t zcrypt_open_count = ATOMIC_INIT(0);
64 static atomic_t zcrypt_rescan_count = ATOMIC_INIT(0);
65 
66 atomic_t zcrypt_rescan_req = ATOMIC_INIT(0);
67 EXPORT_SYMBOL(zcrypt_rescan_req);
68 
69 static LIST_HEAD(zcrypt_ops_list);
70 
71 /* Zcrypt related debug feature stuff. */
72 debug_info_t *zcrypt_dbf_info;
73 
74 /**
75  * Process a rescan of the transport layer.
76  *
77  * Returns 1, if the rescan has been processed, otherwise 0.
78  */
79 static inline int zcrypt_process_rescan(void)
80 {
81 	if (atomic_read(&zcrypt_rescan_req)) {
82 		atomic_set(&zcrypt_rescan_req, 0);
83 		atomic_inc(&zcrypt_rescan_count);
84 		ap_bus_force_rescan();
85 		ZCRYPT_DBF(DBF_INFO, "rescan count=%07d\n",
86 			   atomic_inc_return(&zcrypt_rescan_count));
87 		return 1;
88 	}
89 	return 0;
90 }
91 
92 void zcrypt_msgtype_register(struct zcrypt_ops *zops)
93 {
94 	list_add_tail(&zops->list, &zcrypt_ops_list);
95 }
96 
97 void zcrypt_msgtype_unregister(struct zcrypt_ops *zops)
98 {
99 	list_del_init(&zops->list);
100 }
101 
102 struct zcrypt_ops *zcrypt_msgtype(unsigned char *name, int variant)
103 {
104 	struct zcrypt_ops *zops;
105 
106 	list_for_each_entry(zops, &zcrypt_ops_list, list)
107 		if ((zops->variant == variant) &&
108 		    (!strncmp(zops->name, name, sizeof(zops->name))))
109 			return zops;
110 	return NULL;
111 }
112 EXPORT_SYMBOL(zcrypt_msgtype);
113 
114 /*
115  * Multi device nodes extension functions.
116  */
117 
118 #ifdef CONFIG_ZCRYPT_MULTIDEVNODES
119 
120 struct zcdn_device;
121 
122 static struct class *zcrypt_class;
123 static dev_t zcrypt_devt;
124 static struct cdev zcrypt_cdev;
125 
126 struct zcdn_device {
127 	struct device device;
128 	struct ap_perms perms;
129 };
130 
131 #define to_zcdn_dev(x) container_of((x), struct zcdn_device, device)
132 
133 #define ZCDN_MAX_NAME 32
134 
135 static int zcdn_create(const char *name);
136 static int zcdn_destroy(const char *name);
137 
138 /*
139  * Find zcdn device by name.
140  * Returns reference to the zcdn device which needs to be released
141  * with put_device() after use.
142  */
143 static inline struct zcdn_device *find_zcdndev_by_name(const char *name)
144 {
145 	struct device *dev = class_find_device_by_name(zcrypt_class, name);
146 
147 	return dev ? to_zcdn_dev(dev) : NULL;
148 }
149 
150 /*
151  * Find zcdn device by devt value.
152  * Returns reference to the zcdn device which needs to be released
153  * with put_device() after use.
154  */
155 static inline struct zcdn_device *find_zcdndev_by_devt(dev_t devt)
156 {
157 	struct device *dev = class_find_device_by_devt(zcrypt_class, devt);
158 
159 	return dev ? to_zcdn_dev(dev) : NULL;
160 }
161 
162 static ssize_t ioctlmask_show(struct device *dev,
163 			      struct device_attribute *attr,
164 			      char *buf)
165 {
166 	int i, rc;
167 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
168 
169 	if (mutex_lock_interruptible(&ap_perms_mutex))
170 		return -ERESTARTSYS;
171 
172 	buf[0] = '0';
173 	buf[1] = 'x';
174 	for (i = 0; i < sizeof(zcdndev->perms.ioctlm) / sizeof(long); i++)
175 		snprintf(buf + 2 + 2 * i * sizeof(long),
176 			 PAGE_SIZE - 2 - 2 * i * sizeof(long),
177 			 "%016lx", zcdndev->perms.ioctlm[i]);
178 	buf[2 + 2 * i * sizeof(long)] = '\n';
179 	buf[2 + 2 * i * sizeof(long) + 1] = '\0';
180 	rc = 2 + 2 * i * sizeof(long) + 1;
181 
182 	mutex_unlock(&ap_perms_mutex);
183 
184 	return rc;
185 }
186 
187 static ssize_t ioctlmask_store(struct device *dev,
188 			       struct device_attribute *attr,
189 			       const char *buf, size_t count)
190 {
191 	int rc;
192 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
193 
194 	rc = ap_parse_mask_str(buf, zcdndev->perms.ioctlm,
195 			       AP_IOCTLS, &ap_perms_mutex);
196 	if (rc)
197 		return rc;
198 
199 	return count;
200 }
201 
202 static DEVICE_ATTR_RW(ioctlmask);
203 
204 static ssize_t apmask_show(struct device *dev,
205 			   struct device_attribute *attr,
206 			   char *buf)
207 {
208 	int i, rc;
209 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
210 
211 	if (mutex_lock_interruptible(&ap_perms_mutex))
212 		return -ERESTARTSYS;
213 
214 	buf[0] = '0';
215 	buf[1] = 'x';
216 	for (i = 0; i < sizeof(zcdndev->perms.apm) / sizeof(long); i++)
217 		snprintf(buf + 2 + 2 * i * sizeof(long),
218 			 PAGE_SIZE - 2 - 2 * i * sizeof(long),
219 			 "%016lx", zcdndev->perms.apm[i]);
220 	buf[2 + 2 * i * sizeof(long)] = '\n';
221 	buf[2 + 2 * i * sizeof(long) + 1] = '\0';
222 	rc = 2 + 2 * i * sizeof(long) + 1;
223 
224 	mutex_unlock(&ap_perms_mutex);
225 
226 	return rc;
227 }
228 
229 static ssize_t apmask_store(struct device *dev,
230 			    struct device_attribute *attr,
231 			    const char *buf, size_t count)
232 {
233 	int rc;
234 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
235 
236 	rc = ap_parse_mask_str(buf, zcdndev->perms.apm,
237 			       AP_DEVICES, &ap_perms_mutex);
238 	if (rc)
239 		return rc;
240 
241 	return count;
242 }
243 
244 static DEVICE_ATTR_RW(apmask);
245 
246 static ssize_t aqmask_show(struct device *dev,
247 			   struct device_attribute *attr,
248 			   char *buf)
249 {
250 	int i, rc;
251 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
252 
253 	if (mutex_lock_interruptible(&ap_perms_mutex))
254 		return -ERESTARTSYS;
255 
256 	buf[0] = '0';
257 	buf[1] = 'x';
258 	for (i = 0; i < sizeof(zcdndev->perms.aqm) / sizeof(long); i++)
259 		snprintf(buf + 2 + 2 * i * sizeof(long),
260 			 PAGE_SIZE - 2 - 2 * i * sizeof(long),
261 			 "%016lx", zcdndev->perms.aqm[i]);
262 	buf[2 + 2 * i * sizeof(long)] = '\n';
263 	buf[2 + 2 * i * sizeof(long) + 1] = '\0';
264 	rc = 2 + 2 * i * sizeof(long) + 1;
265 
266 	mutex_unlock(&ap_perms_mutex);
267 
268 	return rc;
269 }
270 
271 static ssize_t aqmask_store(struct device *dev,
272 			    struct device_attribute *attr,
273 			    const char *buf, size_t count)
274 {
275 	int rc;
276 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
277 
278 	rc = ap_parse_mask_str(buf, zcdndev->perms.aqm,
279 			       AP_DOMAINS, &ap_perms_mutex);
280 	if (rc)
281 		return rc;
282 
283 	return count;
284 }
285 
286 static DEVICE_ATTR_RW(aqmask);
287 
288 static struct attribute *zcdn_dev_attrs[] = {
289 	&dev_attr_ioctlmask.attr,
290 	&dev_attr_apmask.attr,
291 	&dev_attr_aqmask.attr,
292 	NULL
293 };
294 
295 static struct attribute_group zcdn_dev_attr_group = {
296 	.attrs = zcdn_dev_attrs
297 };
298 
299 static const struct attribute_group *zcdn_dev_attr_groups[] = {
300 	&zcdn_dev_attr_group,
301 	NULL
302 };
303 
304 static ssize_t zcdn_create_store(struct class *class,
305 				 struct class_attribute *attr,
306 				 const char *buf, size_t count)
307 {
308 	int rc;
309 	char name[ZCDN_MAX_NAME];
310 
311 	strncpy(name, skip_spaces(buf), sizeof(name));
312 	name[sizeof(name) - 1] = '\0';
313 
314 	rc = zcdn_create(strim(name));
315 
316 	return rc ? rc : count;
317 }
318 
319 static const struct class_attribute class_attr_zcdn_create =
320 	__ATTR(create, 0600, NULL, zcdn_create_store);
321 
322 static ssize_t zcdn_destroy_store(struct class *class,
323 				  struct class_attribute *attr,
324 				  const char *buf, size_t count)
325 {
326 	int rc;
327 	char name[ZCDN_MAX_NAME];
328 
329 	strncpy(name, skip_spaces(buf), sizeof(name));
330 	name[sizeof(name) - 1] = '\0';
331 
332 	rc = zcdn_destroy(strim(name));
333 
334 	return rc ? rc : count;
335 }
336 
337 static const struct class_attribute class_attr_zcdn_destroy =
338 	__ATTR(destroy, 0600, NULL, zcdn_destroy_store);
339 
340 static void zcdn_device_release(struct device *dev)
341 {
342 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
343 
344 	ZCRYPT_DBF(DBF_INFO, "releasing zcdn device %d:%d\n",
345 		   MAJOR(dev->devt), MINOR(dev->devt));
346 
347 	kfree(zcdndev);
348 }
349 
350 static int zcdn_create(const char *name)
351 {
352 	dev_t devt;
353 	int i, rc = 0;
354 	char nodename[ZCDN_MAX_NAME];
355 	struct zcdn_device *zcdndev;
356 
357 	if (mutex_lock_interruptible(&ap_perms_mutex))
358 		return -ERESTARTSYS;
359 
360 	/* check if device node with this name already exists */
361 	if (name[0]) {
362 		zcdndev = find_zcdndev_by_name(name);
363 		if (zcdndev) {
364 			put_device(&zcdndev->device);
365 			rc = -EEXIST;
366 			goto unlockout;
367 		}
368 	}
369 
370 	/* find an unused minor number */
371 	for (i = 0; i < ZCRYPT_MAX_MINOR_NODES; i++) {
372 		devt = MKDEV(MAJOR(zcrypt_devt), MINOR(zcrypt_devt) + i);
373 		zcdndev = find_zcdndev_by_devt(devt);
374 		if (zcdndev)
375 			put_device(&zcdndev->device);
376 		else
377 			break;
378 	}
379 	if (i == ZCRYPT_MAX_MINOR_NODES) {
380 		rc = -ENOSPC;
381 		goto unlockout;
382 	}
383 
384 	/* alloc and prepare a new zcdn device */
385 	zcdndev = kzalloc(sizeof(*zcdndev), GFP_KERNEL);
386 	if (!zcdndev) {
387 		rc = -ENOMEM;
388 		goto unlockout;
389 	}
390 	zcdndev->device.release = zcdn_device_release;
391 	zcdndev->device.class = zcrypt_class;
392 	zcdndev->device.devt = devt;
393 	zcdndev->device.groups = zcdn_dev_attr_groups;
394 	if (name[0])
395 		strncpy(nodename, name, sizeof(nodename));
396 	else
397 		snprintf(nodename, sizeof(nodename),
398 			 ZCRYPT_NAME "_%d", (int) MINOR(devt));
399 	nodename[sizeof(nodename)-1] = '\0';
400 	if (dev_set_name(&zcdndev->device, nodename)) {
401 		rc = -EINVAL;
402 		goto unlockout;
403 	}
404 	rc = device_register(&zcdndev->device);
405 	if (rc) {
406 		put_device(&zcdndev->device);
407 		goto unlockout;
408 	}
409 
410 	ZCRYPT_DBF(DBF_INFO, "created zcdn device %d:%d\n",
411 		   MAJOR(devt), MINOR(devt));
412 
413 unlockout:
414 	mutex_unlock(&ap_perms_mutex);
415 	return rc;
416 }
417 
418 static int zcdn_destroy(const char *name)
419 {
420 	int rc = 0;
421 	struct zcdn_device *zcdndev;
422 
423 	if (mutex_lock_interruptible(&ap_perms_mutex))
424 		return -ERESTARTSYS;
425 
426 	/* try to find this zcdn device */
427 	zcdndev = find_zcdndev_by_name(name);
428 	if (!zcdndev) {
429 		rc = -ENOENT;
430 		goto unlockout;
431 	}
432 
433 	/*
434 	 * The zcdn device is not hard destroyed. It is subject to
435 	 * reference counting and thus just needs to be unregistered.
436 	 */
437 	put_device(&zcdndev->device);
438 	device_unregister(&zcdndev->device);
439 
440 unlockout:
441 	mutex_unlock(&ap_perms_mutex);
442 	return rc;
443 }
444 
445 static void zcdn_destroy_all(void)
446 {
447 	int i;
448 	dev_t devt;
449 	struct zcdn_device *zcdndev;
450 
451 	mutex_lock(&ap_perms_mutex);
452 	for (i = 0; i < ZCRYPT_MAX_MINOR_NODES; i++) {
453 		devt = MKDEV(MAJOR(zcrypt_devt), MINOR(zcrypt_devt) + i);
454 		zcdndev = find_zcdndev_by_devt(devt);
455 		if (zcdndev) {
456 			put_device(&zcdndev->device);
457 			device_unregister(&zcdndev->device);
458 		}
459 	}
460 	mutex_unlock(&ap_perms_mutex);
461 }
462 
463 #endif
464 
465 /**
466  * zcrypt_read (): Not supported beyond zcrypt 1.3.1.
467  *
468  * This function is not supported beyond zcrypt 1.3.1.
469  */
470 static ssize_t zcrypt_read(struct file *filp, char __user *buf,
471 			   size_t count, loff_t *f_pos)
472 {
473 	return -EPERM;
474 }
475 
476 /**
477  * zcrypt_write(): Not allowed.
478  *
479  * Write is is not allowed
480  */
481 static ssize_t zcrypt_write(struct file *filp, const char __user *buf,
482 			    size_t count, loff_t *f_pos)
483 {
484 	return -EPERM;
485 }
486 
487 /**
488  * zcrypt_open(): Count number of users.
489  *
490  * Device open function to count number of users.
491  */
492 static int zcrypt_open(struct inode *inode, struct file *filp)
493 {
494 	struct ap_perms *perms = &ap_perms;
495 
496 #ifdef CONFIG_ZCRYPT_MULTIDEVNODES
497 	if (filp->f_inode->i_cdev == &zcrypt_cdev) {
498 		struct zcdn_device *zcdndev;
499 
500 		if (mutex_lock_interruptible(&ap_perms_mutex))
501 			return -ERESTARTSYS;
502 		zcdndev = find_zcdndev_by_devt(filp->f_inode->i_rdev);
503 		/* find returns a reference, no get_device() needed */
504 		mutex_unlock(&ap_perms_mutex);
505 		if (zcdndev)
506 			perms = &zcdndev->perms;
507 	}
508 #endif
509 	filp->private_data = (void *) perms;
510 
511 	atomic_inc(&zcrypt_open_count);
512 	return stream_open(inode, filp);
513 }
514 
515 /**
516  * zcrypt_release(): Count number of users.
517  *
518  * Device close function to count number of users.
519  */
520 static int zcrypt_release(struct inode *inode, struct file *filp)
521 {
522 #ifdef CONFIG_ZCRYPT_MULTIDEVNODES
523 	if (filp->f_inode->i_cdev == &zcrypt_cdev) {
524 		struct zcdn_device *zcdndev;
525 
526 		mutex_lock(&ap_perms_mutex);
527 		zcdndev = find_zcdndev_by_devt(filp->f_inode->i_rdev);
528 		mutex_unlock(&ap_perms_mutex);
529 		if (zcdndev) {
530 			/* 2 puts here: one for find, one for open */
531 			put_device(&zcdndev->device);
532 			put_device(&zcdndev->device);
533 		}
534 	}
535 #endif
536 
537 	atomic_dec(&zcrypt_open_count);
538 	return 0;
539 }
540 
541 static inline int zcrypt_check_ioctl(struct ap_perms *perms,
542 				     unsigned int cmd)
543 {
544 	int rc = -EPERM;
545 	int ioctlnr = (cmd & _IOC_NRMASK) >> _IOC_NRSHIFT;
546 
547 	if (ioctlnr > 0 && ioctlnr < AP_IOCTLS) {
548 		if (test_bit_inv(ioctlnr, perms->ioctlm))
549 			rc = 0;
550 	}
551 
552 	if (rc)
553 		ZCRYPT_DBF(DBF_WARN,
554 			   "ioctl check failed: ioctlnr=0x%04x rc=%d\n",
555 			   ioctlnr, rc);
556 
557 	return rc;
558 }
559 
560 static inline bool zcrypt_check_card(struct ap_perms *perms, int card)
561 {
562 	return test_bit_inv(card, perms->apm) ? true : false;
563 }
564 
565 static inline bool zcrypt_check_queue(struct ap_perms *perms, int queue)
566 {
567 	return test_bit_inv(queue, perms->aqm) ? true : false;
568 }
569 
570 static inline struct zcrypt_queue *zcrypt_pick_queue(struct zcrypt_card *zc,
571 						     struct zcrypt_queue *zq,
572 						     struct module **pmod,
573 						     unsigned int weight)
574 {
575 	if (!zq || !try_module_get(zq->queue->ap_dev.drv->driver.owner))
576 		return NULL;
577 	zcrypt_queue_get(zq);
578 	get_device(&zq->queue->ap_dev.device);
579 	atomic_add(weight, &zc->load);
580 	atomic_add(weight, &zq->load);
581 	zq->request_count++;
582 	*pmod = zq->queue->ap_dev.drv->driver.owner;
583 	return zq;
584 }
585 
586 static inline void zcrypt_drop_queue(struct zcrypt_card *zc,
587 				     struct zcrypt_queue *zq,
588 				     struct module *mod,
589 				     unsigned int weight)
590 {
591 	zq->request_count--;
592 	atomic_sub(weight, &zc->load);
593 	atomic_sub(weight, &zq->load);
594 	put_device(&zq->queue->ap_dev.device);
595 	zcrypt_queue_put(zq);
596 	module_put(mod);
597 }
598 
599 static inline bool zcrypt_card_compare(struct zcrypt_card *zc,
600 				       struct zcrypt_card *pref_zc,
601 				       unsigned int weight,
602 				       unsigned int pref_weight)
603 {
604 	if (!pref_zc)
605 		return false;
606 	weight += atomic_read(&zc->load);
607 	pref_weight += atomic_read(&pref_zc->load);
608 	if (weight == pref_weight)
609 		return atomic_read(&zc->card->total_request_count) >
610 			atomic_read(&pref_zc->card->total_request_count);
611 	return weight > pref_weight;
612 }
613 
614 static inline bool zcrypt_queue_compare(struct zcrypt_queue *zq,
615 					struct zcrypt_queue *pref_zq,
616 					unsigned int weight,
617 					unsigned int pref_weight)
618 {
619 	if (!pref_zq)
620 		return false;
621 	weight += atomic_read(&zq->load);
622 	pref_weight += atomic_read(&pref_zq->load);
623 	if (weight == pref_weight)
624 		return zq->queue->total_request_count >
625 			pref_zq->queue->total_request_count;
626 	return weight > pref_weight;
627 }
628 
629 /*
630  * zcrypt ioctls.
631  */
632 static long zcrypt_rsa_modexpo(struct ap_perms *perms,
633 			       struct ica_rsa_modexpo *mex)
634 {
635 	struct zcrypt_card *zc, *pref_zc;
636 	struct zcrypt_queue *zq, *pref_zq;
637 	unsigned int weight, pref_weight;
638 	unsigned int func_code;
639 	int qid = 0, rc = -ENODEV;
640 	struct module *mod;
641 
642 	trace_s390_zcrypt_req(mex, TP_ICARSAMODEXPO);
643 
644 	if (mex->outputdatalength < mex->inputdatalength) {
645 		func_code = 0;
646 		rc = -EINVAL;
647 		goto out;
648 	}
649 
650 	/*
651 	 * As long as outputdatalength is big enough, we can set the
652 	 * outputdatalength equal to the inputdatalength, since that is the
653 	 * number of bytes we will copy in any case
654 	 */
655 	mex->outputdatalength = mex->inputdatalength;
656 
657 	rc = get_rsa_modex_fc(mex, &func_code);
658 	if (rc)
659 		goto out;
660 
661 	pref_zc = NULL;
662 	pref_zq = NULL;
663 	spin_lock(&zcrypt_list_lock);
664 	for_each_zcrypt_card(zc) {
665 		/* Check for online accelarator and CCA cards */
666 		if (!zc->online || !(zc->card->functions & 0x18000000))
667 			continue;
668 		/* Check for size limits */
669 		if (zc->min_mod_size > mex->inputdatalength ||
670 		    zc->max_mod_size < mex->inputdatalength)
671 			continue;
672 		/* check if device node has admission for this card */
673 		if (!zcrypt_check_card(perms, zc->card->id))
674 			continue;
675 		/* get weight index of the card device	*/
676 		weight = zc->speed_rating[func_code];
677 		if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
678 			continue;
679 		for_each_zcrypt_queue(zq, zc) {
680 			/* check if device is online and eligible */
681 			if (!zq->online || !zq->ops->rsa_modexpo)
682 				continue;
683 			/* check if device node has admission for this queue */
684 			if (!zcrypt_check_queue(perms,
685 						AP_QID_QUEUE(zq->queue->qid)))
686 				continue;
687 			if (zcrypt_queue_compare(zq, pref_zq,
688 						 weight, pref_weight))
689 				continue;
690 			pref_zc = zc;
691 			pref_zq = zq;
692 			pref_weight = weight;
693 		}
694 	}
695 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, weight);
696 	spin_unlock(&zcrypt_list_lock);
697 
698 	if (!pref_zq) {
699 		rc = -ENODEV;
700 		goto out;
701 	}
702 
703 	qid = pref_zq->queue->qid;
704 	rc = pref_zq->ops->rsa_modexpo(pref_zq, mex);
705 
706 	spin_lock(&zcrypt_list_lock);
707 	zcrypt_drop_queue(pref_zc, pref_zq, mod, weight);
708 	spin_unlock(&zcrypt_list_lock);
709 
710 out:
711 	trace_s390_zcrypt_rep(mex, func_code, rc,
712 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
713 	return rc;
714 }
715 
716 static long zcrypt_rsa_crt(struct ap_perms *perms,
717 			   struct ica_rsa_modexpo_crt *crt)
718 {
719 	struct zcrypt_card *zc, *pref_zc;
720 	struct zcrypt_queue *zq, *pref_zq;
721 	unsigned int weight, pref_weight;
722 	unsigned int func_code;
723 	int qid = 0, rc = -ENODEV;
724 	struct module *mod;
725 
726 	trace_s390_zcrypt_req(crt, TP_ICARSACRT);
727 
728 	if (crt->outputdatalength < crt->inputdatalength) {
729 		func_code = 0;
730 		rc = -EINVAL;
731 		goto out;
732 	}
733 
734 	/*
735 	 * As long as outputdatalength is big enough, we can set the
736 	 * outputdatalength equal to the inputdatalength, since that is the
737 	 * number of bytes we will copy in any case
738 	 */
739 	crt->outputdatalength = crt->inputdatalength;
740 
741 	rc = get_rsa_crt_fc(crt, &func_code);
742 	if (rc)
743 		goto out;
744 
745 	pref_zc = NULL;
746 	pref_zq = NULL;
747 	spin_lock(&zcrypt_list_lock);
748 	for_each_zcrypt_card(zc) {
749 		/* Check for online accelarator and CCA cards */
750 		if (!zc->online || !(zc->card->functions & 0x18000000))
751 			continue;
752 		/* Check for size limits */
753 		if (zc->min_mod_size > crt->inputdatalength ||
754 		    zc->max_mod_size < crt->inputdatalength)
755 			continue;
756 		/* check if device node has admission for this card */
757 		if (!zcrypt_check_card(perms, zc->card->id))
758 			continue;
759 		/* get weight index of the card device	*/
760 		weight = zc->speed_rating[func_code];
761 		if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
762 			continue;
763 		for_each_zcrypt_queue(zq, zc) {
764 			/* check if device is online and eligible */
765 			if (!zq->online || !zq->ops->rsa_modexpo_crt)
766 				continue;
767 			/* check if device node has admission for this queue */
768 			if (!zcrypt_check_queue(perms,
769 						AP_QID_QUEUE(zq->queue->qid)))
770 				continue;
771 			if (zcrypt_queue_compare(zq, pref_zq,
772 						 weight, pref_weight))
773 				continue;
774 			pref_zc = zc;
775 			pref_zq = zq;
776 			pref_weight = weight;
777 		}
778 	}
779 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, weight);
780 	spin_unlock(&zcrypt_list_lock);
781 
782 	if (!pref_zq) {
783 		rc = -ENODEV;
784 		goto out;
785 	}
786 
787 	qid = pref_zq->queue->qid;
788 	rc = pref_zq->ops->rsa_modexpo_crt(pref_zq, crt);
789 
790 	spin_lock(&zcrypt_list_lock);
791 	zcrypt_drop_queue(pref_zc, pref_zq, mod, weight);
792 	spin_unlock(&zcrypt_list_lock);
793 
794 out:
795 	trace_s390_zcrypt_rep(crt, func_code, rc,
796 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
797 	return rc;
798 }
799 
800 static long _zcrypt_send_cprb(struct ap_perms *perms,
801 			      struct ica_xcRB *xcRB)
802 {
803 	struct zcrypt_card *zc, *pref_zc;
804 	struct zcrypt_queue *zq, *pref_zq;
805 	struct ap_message ap_msg;
806 	unsigned int weight, pref_weight;
807 	unsigned int func_code;
808 	unsigned short *domain, tdom;
809 	int qid = 0, rc = -ENODEV;
810 	struct module *mod;
811 
812 	trace_s390_zcrypt_req(xcRB, TB_ZSECSENDCPRB);
813 
814 	xcRB->status = 0;
815 	ap_init_message(&ap_msg);
816 	rc = get_cprb_fc(xcRB, &ap_msg, &func_code, &domain);
817 	if (rc)
818 		goto out;
819 
820 	/*
821 	 * If a valid target domain is set and this domain is NOT a usage
822 	 * domain but a control only domain, use the default domain as target.
823 	 */
824 	tdom = *domain;
825 	if (tdom >= 0 && tdom < AP_DOMAINS &&
826 	    !ap_test_config_usage_domain(tdom) &&
827 	    ap_test_config_ctrl_domain(tdom) &&
828 	    ap_domain_index >= 0)
829 		tdom = ap_domain_index;
830 
831 	pref_zc = NULL;
832 	pref_zq = NULL;
833 	spin_lock(&zcrypt_list_lock);
834 	for_each_zcrypt_card(zc) {
835 		/* Check for online CCA cards */
836 		if (!zc->online || !(zc->card->functions & 0x10000000))
837 			continue;
838 		/* Check for user selected CCA card */
839 		if (xcRB->user_defined != AUTOSELECT &&
840 		    xcRB->user_defined != zc->card->id)
841 			continue;
842 		/* check if device node has admission for this card */
843 		if (!zcrypt_check_card(perms, zc->card->id))
844 			continue;
845 		/* get weight index of the card device	*/
846 		weight = speed_idx_cca(func_code) * zc->speed_rating[SECKEY];
847 		if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
848 			continue;
849 		for_each_zcrypt_queue(zq, zc) {
850 			/* check if device is online and eligible */
851 			if (!zq->online ||
852 			    !zq->ops->send_cprb ||
853 			    (tdom != AUTOSEL_DOM &&
854 			     tdom != AP_QID_QUEUE(zq->queue->qid)))
855 				continue;
856 			/* check if device node has admission for this queue */
857 			if (!zcrypt_check_queue(perms,
858 						AP_QID_QUEUE(zq->queue->qid)))
859 				continue;
860 			if (zcrypt_queue_compare(zq, pref_zq,
861 						 weight, pref_weight))
862 				continue;
863 			pref_zc = zc;
864 			pref_zq = zq;
865 			pref_weight = weight;
866 		}
867 	}
868 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, weight);
869 	spin_unlock(&zcrypt_list_lock);
870 
871 	if (!pref_zq) {
872 		rc = -ENODEV;
873 		goto out;
874 	}
875 
876 	/* in case of auto select, provide the correct domain */
877 	qid = pref_zq->queue->qid;
878 	if (*domain == AUTOSEL_DOM)
879 		*domain = AP_QID_QUEUE(qid);
880 
881 	rc = pref_zq->ops->send_cprb(pref_zq, xcRB, &ap_msg);
882 
883 	spin_lock(&zcrypt_list_lock);
884 	zcrypt_drop_queue(pref_zc, pref_zq, mod, weight);
885 	spin_unlock(&zcrypt_list_lock);
886 
887 out:
888 	ap_release_message(&ap_msg);
889 	trace_s390_zcrypt_rep(xcRB, func_code, rc,
890 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
891 	return rc;
892 }
893 
894 long zcrypt_send_cprb(struct ica_xcRB *xcRB)
895 {
896 	return _zcrypt_send_cprb(&ap_perms, xcRB);
897 }
898 EXPORT_SYMBOL(zcrypt_send_cprb);
899 
900 static bool is_desired_ep11_card(unsigned int dev_id,
901 				 unsigned short target_num,
902 				 struct ep11_target_dev *targets)
903 {
904 	while (target_num-- > 0) {
905 		if (targets->ap_id == dev_id || targets->ap_id == AUTOSEL_AP)
906 			return true;
907 		targets++;
908 	}
909 	return false;
910 }
911 
912 static bool is_desired_ep11_queue(unsigned int dev_qid,
913 				  unsigned short target_num,
914 				  struct ep11_target_dev *targets)
915 {
916 	int card = AP_QID_CARD(dev_qid), dom = AP_QID_QUEUE(dev_qid);
917 
918 	while (target_num-- > 0) {
919 		if ((targets->ap_id == card || targets->ap_id == AUTOSEL_AP) &&
920 		    (targets->dom_id == dom || targets->dom_id == AUTOSEL_DOM))
921 			return true;
922 		targets++;
923 	}
924 	return false;
925 }
926 
927 static long _zcrypt_send_ep11_cprb(struct ap_perms *perms,
928 				   struct ep11_urb *xcrb)
929 {
930 	struct zcrypt_card *zc, *pref_zc;
931 	struct zcrypt_queue *zq, *pref_zq;
932 	struct ep11_target_dev *targets;
933 	unsigned short target_num;
934 	unsigned int weight, pref_weight;
935 	unsigned int func_code;
936 	struct ap_message ap_msg;
937 	int qid = 0, rc = -ENODEV;
938 	struct module *mod;
939 
940 	trace_s390_zcrypt_req(xcrb, TP_ZSENDEP11CPRB);
941 
942 	ap_init_message(&ap_msg);
943 
944 	target_num = (unsigned short) xcrb->targets_num;
945 
946 	/* empty list indicates autoselect (all available targets) */
947 	targets = NULL;
948 	if (target_num != 0) {
949 		struct ep11_target_dev __user *uptr;
950 
951 		targets = kcalloc(target_num, sizeof(*targets), GFP_KERNEL);
952 		if (!targets) {
953 			func_code = 0;
954 			rc = -ENOMEM;
955 			goto out;
956 		}
957 
958 		uptr = (struct ep11_target_dev __force __user *) xcrb->targets;
959 		if (copy_from_user(targets, uptr,
960 				   target_num * sizeof(*targets))) {
961 			func_code = 0;
962 			rc = -EFAULT;
963 			goto out_free;
964 		}
965 	}
966 
967 	rc = get_ep11cprb_fc(xcrb, &ap_msg, &func_code);
968 	if (rc)
969 		goto out_free;
970 
971 	pref_zc = NULL;
972 	pref_zq = NULL;
973 	spin_lock(&zcrypt_list_lock);
974 	for_each_zcrypt_card(zc) {
975 		/* Check for online EP11 cards */
976 		if (!zc->online || !(zc->card->functions & 0x04000000))
977 			continue;
978 		/* Check for user selected EP11 card */
979 		if (targets &&
980 		    !is_desired_ep11_card(zc->card->id, target_num, targets))
981 			continue;
982 		/* check if device node has admission for this card */
983 		if (!zcrypt_check_card(perms, zc->card->id))
984 			continue;
985 		/* get weight index of the card device	*/
986 		weight = speed_idx_ep11(func_code) * zc->speed_rating[SECKEY];
987 		if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
988 			continue;
989 		for_each_zcrypt_queue(zq, zc) {
990 			/* check if device is online and eligible */
991 			if (!zq->online ||
992 			    !zq->ops->send_ep11_cprb ||
993 			    (targets &&
994 			     !is_desired_ep11_queue(zq->queue->qid,
995 						    target_num, targets)))
996 				continue;
997 			/* check if device node has admission for this queue */
998 			if (!zcrypt_check_queue(perms,
999 						AP_QID_QUEUE(zq->queue->qid)))
1000 				continue;
1001 			if (zcrypt_queue_compare(zq, pref_zq,
1002 						 weight, pref_weight))
1003 				continue;
1004 			pref_zc = zc;
1005 			pref_zq = zq;
1006 			pref_weight = weight;
1007 		}
1008 	}
1009 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, weight);
1010 	spin_unlock(&zcrypt_list_lock);
1011 
1012 	if (!pref_zq) {
1013 		rc = -ENODEV;
1014 		goto out_free;
1015 	}
1016 
1017 	qid = pref_zq->queue->qid;
1018 	rc = pref_zq->ops->send_ep11_cprb(pref_zq, xcrb, &ap_msg);
1019 
1020 	spin_lock(&zcrypt_list_lock);
1021 	zcrypt_drop_queue(pref_zc, pref_zq, mod, weight);
1022 	spin_unlock(&zcrypt_list_lock);
1023 
1024 out_free:
1025 	kfree(targets);
1026 out:
1027 	ap_release_message(&ap_msg);
1028 	trace_s390_zcrypt_rep(xcrb, func_code, rc,
1029 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
1030 	return rc;
1031 }
1032 
1033 long zcrypt_send_ep11_cprb(struct ep11_urb *xcrb)
1034 {
1035 	return _zcrypt_send_ep11_cprb(&ap_perms, xcrb);
1036 }
1037 EXPORT_SYMBOL(zcrypt_send_ep11_cprb);
1038 
1039 static long zcrypt_rng(char *buffer)
1040 {
1041 	struct zcrypt_card *zc, *pref_zc;
1042 	struct zcrypt_queue *zq, *pref_zq;
1043 	unsigned int weight, pref_weight;
1044 	unsigned int func_code;
1045 	struct ap_message ap_msg;
1046 	unsigned int domain;
1047 	int qid = 0, rc = -ENODEV;
1048 	struct module *mod;
1049 
1050 	trace_s390_zcrypt_req(buffer, TP_HWRNGCPRB);
1051 
1052 	ap_init_message(&ap_msg);
1053 	rc = get_rng_fc(&ap_msg, &func_code, &domain);
1054 	if (rc)
1055 		goto out;
1056 
1057 	pref_zc = NULL;
1058 	pref_zq = NULL;
1059 	spin_lock(&zcrypt_list_lock);
1060 	for_each_zcrypt_card(zc) {
1061 		/* Check for online CCA cards */
1062 		if (!zc->online || !(zc->card->functions & 0x10000000))
1063 			continue;
1064 		/* get weight index of the card device	*/
1065 		weight = zc->speed_rating[func_code];
1066 		if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
1067 			continue;
1068 		for_each_zcrypt_queue(zq, zc) {
1069 			/* check if device is online and eligible */
1070 			if (!zq->online || !zq->ops->rng)
1071 				continue;
1072 			if (zcrypt_queue_compare(zq, pref_zq,
1073 						 weight, pref_weight))
1074 				continue;
1075 			pref_zc = zc;
1076 			pref_zq = zq;
1077 			pref_weight = weight;
1078 		}
1079 	}
1080 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, weight);
1081 	spin_unlock(&zcrypt_list_lock);
1082 
1083 	if (!pref_zq) {
1084 		rc = -ENODEV;
1085 		goto out;
1086 	}
1087 
1088 	qid = pref_zq->queue->qid;
1089 	rc = pref_zq->ops->rng(pref_zq, buffer, &ap_msg);
1090 
1091 	spin_lock(&zcrypt_list_lock);
1092 	zcrypt_drop_queue(pref_zc, pref_zq, mod, weight);
1093 	spin_unlock(&zcrypt_list_lock);
1094 
1095 out:
1096 	ap_release_message(&ap_msg);
1097 	trace_s390_zcrypt_rep(buffer, func_code, rc,
1098 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
1099 	return rc;
1100 }
1101 
1102 static void zcrypt_device_status_mask(struct zcrypt_device_status *devstatus)
1103 {
1104 	struct zcrypt_card *zc;
1105 	struct zcrypt_queue *zq;
1106 	struct zcrypt_device_status *stat;
1107 	int card, queue;
1108 
1109 	memset(devstatus, 0, MAX_ZDEV_ENTRIES
1110 	       * sizeof(struct zcrypt_device_status));
1111 
1112 	spin_lock(&zcrypt_list_lock);
1113 	for_each_zcrypt_card(zc) {
1114 		for_each_zcrypt_queue(zq, zc) {
1115 			card = AP_QID_CARD(zq->queue->qid);
1116 			if (card >= MAX_ZDEV_CARDIDS)
1117 				continue;
1118 			queue = AP_QID_QUEUE(zq->queue->qid);
1119 			stat = &devstatus[card * AP_DOMAINS + queue];
1120 			stat->hwtype = zc->card->ap_dev.device_type;
1121 			stat->functions = zc->card->functions >> 26;
1122 			stat->qid = zq->queue->qid;
1123 			stat->online = zq->online ? 0x01 : 0x00;
1124 		}
1125 	}
1126 	spin_unlock(&zcrypt_list_lock);
1127 }
1128 
1129 void zcrypt_device_status_mask_ext(struct zcrypt_device_status_ext *devstatus)
1130 {
1131 	struct zcrypt_card *zc;
1132 	struct zcrypt_queue *zq;
1133 	struct zcrypt_device_status_ext *stat;
1134 	int card, queue;
1135 
1136 	memset(devstatus, 0, MAX_ZDEV_ENTRIES_EXT
1137 	       * sizeof(struct zcrypt_device_status_ext));
1138 
1139 	spin_lock(&zcrypt_list_lock);
1140 	for_each_zcrypt_card(zc) {
1141 		for_each_zcrypt_queue(zq, zc) {
1142 			card = AP_QID_CARD(zq->queue->qid);
1143 			queue = AP_QID_QUEUE(zq->queue->qid);
1144 			stat = &devstatus[card * AP_DOMAINS + queue];
1145 			stat->hwtype = zc->card->ap_dev.device_type;
1146 			stat->functions = zc->card->functions >> 26;
1147 			stat->qid = zq->queue->qid;
1148 			stat->online = zq->online ? 0x01 : 0x00;
1149 		}
1150 	}
1151 	spin_unlock(&zcrypt_list_lock);
1152 }
1153 EXPORT_SYMBOL(zcrypt_device_status_mask_ext);
1154 
1155 int zcrypt_device_status_ext(int card, int queue,
1156 			     struct zcrypt_device_status_ext *devstat)
1157 {
1158 	struct zcrypt_card *zc;
1159 	struct zcrypt_queue *zq;
1160 
1161 	memset(devstat, 0, sizeof(*devstat));
1162 
1163 	spin_lock(&zcrypt_list_lock);
1164 	for_each_zcrypt_card(zc) {
1165 		for_each_zcrypt_queue(zq, zc) {
1166 			if (card == AP_QID_CARD(zq->queue->qid) &&
1167 			    queue == AP_QID_QUEUE(zq->queue->qid)) {
1168 				devstat->hwtype = zc->card->ap_dev.device_type;
1169 				devstat->functions = zc->card->functions >> 26;
1170 				devstat->qid = zq->queue->qid;
1171 				devstat->online = zq->online ? 0x01 : 0x00;
1172 				spin_unlock(&zcrypt_list_lock);
1173 				return 0;
1174 			}
1175 		}
1176 	}
1177 	spin_unlock(&zcrypt_list_lock);
1178 
1179 	return -ENODEV;
1180 }
1181 EXPORT_SYMBOL(zcrypt_device_status_ext);
1182 
1183 static void zcrypt_status_mask(char status[], size_t max_adapters)
1184 {
1185 	struct zcrypt_card *zc;
1186 	struct zcrypt_queue *zq;
1187 	int card;
1188 
1189 	memset(status, 0, max_adapters);
1190 	spin_lock(&zcrypt_list_lock);
1191 	for_each_zcrypt_card(zc) {
1192 		for_each_zcrypt_queue(zq, zc) {
1193 			card = AP_QID_CARD(zq->queue->qid);
1194 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index
1195 			    || card >= max_adapters)
1196 				continue;
1197 			status[card] = zc->online ? zc->user_space_type : 0x0d;
1198 		}
1199 	}
1200 	spin_unlock(&zcrypt_list_lock);
1201 }
1202 
1203 static void zcrypt_qdepth_mask(char qdepth[], size_t max_adapters)
1204 {
1205 	struct zcrypt_card *zc;
1206 	struct zcrypt_queue *zq;
1207 	int card;
1208 
1209 	memset(qdepth, 0, max_adapters);
1210 	spin_lock(&zcrypt_list_lock);
1211 	local_bh_disable();
1212 	for_each_zcrypt_card(zc) {
1213 		for_each_zcrypt_queue(zq, zc) {
1214 			card = AP_QID_CARD(zq->queue->qid);
1215 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index
1216 			    || card >= max_adapters)
1217 				continue;
1218 			spin_lock(&zq->queue->lock);
1219 			qdepth[card] =
1220 				zq->queue->pendingq_count +
1221 				zq->queue->requestq_count;
1222 			spin_unlock(&zq->queue->lock);
1223 		}
1224 	}
1225 	local_bh_enable();
1226 	spin_unlock(&zcrypt_list_lock);
1227 }
1228 
1229 static void zcrypt_perdev_reqcnt(int reqcnt[], size_t max_adapters)
1230 {
1231 	struct zcrypt_card *zc;
1232 	struct zcrypt_queue *zq;
1233 	int card;
1234 
1235 	memset(reqcnt, 0, sizeof(int) * max_adapters);
1236 	spin_lock(&zcrypt_list_lock);
1237 	local_bh_disable();
1238 	for_each_zcrypt_card(zc) {
1239 		for_each_zcrypt_queue(zq, zc) {
1240 			card = AP_QID_CARD(zq->queue->qid);
1241 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index
1242 			    || card >= max_adapters)
1243 				continue;
1244 			spin_lock(&zq->queue->lock);
1245 			reqcnt[card] = zq->queue->total_request_count;
1246 			spin_unlock(&zq->queue->lock);
1247 		}
1248 	}
1249 	local_bh_enable();
1250 	spin_unlock(&zcrypt_list_lock);
1251 }
1252 
1253 static int zcrypt_pendingq_count(void)
1254 {
1255 	struct zcrypt_card *zc;
1256 	struct zcrypt_queue *zq;
1257 	int pendingq_count;
1258 
1259 	pendingq_count = 0;
1260 	spin_lock(&zcrypt_list_lock);
1261 	local_bh_disable();
1262 	for_each_zcrypt_card(zc) {
1263 		for_each_zcrypt_queue(zq, zc) {
1264 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index)
1265 				continue;
1266 			spin_lock(&zq->queue->lock);
1267 			pendingq_count += zq->queue->pendingq_count;
1268 			spin_unlock(&zq->queue->lock);
1269 		}
1270 	}
1271 	local_bh_enable();
1272 	spin_unlock(&zcrypt_list_lock);
1273 	return pendingq_count;
1274 }
1275 
1276 static int zcrypt_requestq_count(void)
1277 {
1278 	struct zcrypt_card *zc;
1279 	struct zcrypt_queue *zq;
1280 	int requestq_count;
1281 
1282 	requestq_count = 0;
1283 	spin_lock(&zcrypt_list_lock);
1284 	local_bh_disable();
1285 	for_each_zcrypt_card(zc) {
1286 		for_each_zcrypt_queue(zq, zc) {
1287 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index)
1288 				continue;
1289 			spin_lock(&zq->queue->lock);
1290 			requestq_count += zq->queue->requestq_count;
1291 			spin_unlock(&zq->queue->lock);
1292 		}
1293 	}
1294 	local_bh_enable();
1295 	spin_unlock(&zcrypt_list_lock);
1296 	return requestq_count;
1297 }
1298 
1299 static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
1300 				  unsigned long arg)
1301 {
1302 	int rc;
1303 	struct ap_perms *perms =
1304 		(struct ap_perms *) filp->private_data;
1305 
1306 	rc = zcrypt_check_ioctl(perms, cmd);
1307 	if (rc)
1308 		return rc;
1309 
1310 	switch (cmd) {
1311 	case ICARSAMODEXPO: {
1312 		struct ica_rsa_modexpo __user *umex = (void __user *) arg;
1313 		struct ica_rsa_modexpo mex;
1314 
1315 		if (copy_from_user(&mex, umex, sizeof(mex)))
1316 			return -EFAULT;
1317 		do {
1318 			rc = zcrypt_rsa_modexpo(perms, &mex);
1319 		} while (rc == -EAGAIN);
1320 		/* on failure: retry once again after a requested rescan */
1321 		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1322 			do {
1323 				rc = zcrypt_rsa_modexpo(perms, &mex);
1324 			} while (rc == -EAGAIN);
1325 		if (rc) {
1326 			ZCRYPT_DBF(DBF_DEBUG, "ioctl ICARSAMODEXPO rc=%d\n", rc);
1327 			return rc;
1328 		}
1329 		return put_user(mex.outputdatalength, &umex->outputdatalength);
1330 	}
1331 	case ICARSACRT: {
1332 		struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg;
1333 		struct ica_rsa_modexpo_crt crt;
1334 
1335 		if (copy_from_user(&crt, ucrt, sizeof(crt)))
1336 			return -EFAULT;
1337 		do {
1338 			rc = zcrypt_rsa_crt(perms, &crt);
1339 		} while (rc == -EAGAIN);
1340 		/* on failure: retry once again after a requested rescan */
1341 		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1342 			do {
1343 				rc = zcrypt_rsa_crt(perms, &crt);
1344 			} while (rc == -EAGAIN);
1345 		if (rc) {
1346 			ZCRYPT_DBF(DBF_DEBUG, "ioctl ICARSACRT rc=%d\n", rc);
1347 			return rc;
1348 		}
1349 		return put_user(crt.outputdatalength, &ucrt->outputdatalength);
1350 	}
1351 	case ZSECSENDCPRB: {
1352 		struct ica_xcRB __user *uxcRB = (void __user *) arg;
1353 		struct ica_xcRB xcRB;
1354 
1355 		if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB)))
1356 			return -EFAULT;
1357 		do {
1358 			rc = _zcrypt_send_cprb(perms, &xcRB);
1359 		} while (rc == -EAGAIN);
1360 		/* on failure: retry once again after a requested rescan */
1361 		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1362 			do {
1363 				rc = _zcrypt_send_cprb(perms, &xcRB);
1364 			} while (rc == -EAGAIN);
1365 		if (rc)
1366 			ZCRYPT_DBF(DBF_DEBUG, "ioctl ZSENDCPRB rc=%d status=0x%x\n",
1367 				   rc, xcRB.status);
1368 		if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB)))
1369 			return -EFAULT;
1370 		return rc;
1371 	}
1372 	case ZSENDEP11CPRB: {
1373 		struct ep11_urb __user *uxcrb = (void __user *)arg;
1374 		struct ep11_urb xcrb;
1375 
1376 		if (copy_from_user(&xcrb, uxcrb, sizeof(xcrb)))
1377 			return -EFAULT;
1378 		do {
1379 			rc = _zcrypt_send_ep11_cprb(perms, &xcrb);
1380 		} while (rc == -EAGAIN);
1381 		/* on failure: retry once again after a requested rescan */
1382 		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1383 			do {
1384 				rc = _zcrypt_send_ep11_cprb(perms, &xcrb);
1385 			} while (rc == -EAGAIN);
1386 		if (rc)
1387 			ZCRYPT_DBF(DBF_DEBUG, "ioctl ZSENDEP11CPRB rc=%d\n", rc);
1388 		if (copy_to_user(uxcrb, &xcrb, sizeof(xcrb)))
1389 			return -EFAULT;
1390 		return rc;
1391 	}
1392 	case ZCRYPT_DEVICE_STATUS: {
1393 		struct zcrypt_device_status_ext *device_status;
1394 		size_t total_size = MAX_ZDEV_ENTRIES_EXT
1395 			* sizeof(struct zcrypt_device_status_ext);
1396 
1397 		device_status = kzalloc(total_size, GFP_KERNEL);
1398 		if (!device_status)
1399 			return -ENOMEM;
1400 		zcrypt_device_status_mask_ext(device_status);
1401 		if (copy_to_user((char __user *) arg, device_status,
1402 				 total_size))
1403 			rc = -EFAULT;
1404 		kfree(device_status);
1405 		return rc;
1406 	}
1407 	case ZCRYPT_STATUS_MASK: {
1408 		char status[AP_DEVICES];
1409 
1410 		zcrypt_status_mask(status, AP_DEVICES);
1411 		if (copy_to_user((char __user *) arg, status, sizeof(status)))
1412 			return -EFAULT;
1413 		return 0;
1414 	}
1415 	case ZCRYPT_QDEPTH_MASK: {
1416 		char qdepth[AP_DEVICES];
1417 
1418 		zcrypt_qdepth_mask(qdepth, AP_DEVICES);
1419 		if (copy_to_user((char __user *) arg, qdepth, sizeof(qdepth)))
1420 			return -EFAULT;
1421 		return 0;
1422 	}
1423 	case ZCRYPT_PERDEV_REQCNT: {
1424 		int *reqcnt;
1425 
1426 		reqcnt = kcalloc(AP_DEVICES, sizeof(int), GFP_KERNEL);
1427 		if (!reqcnt)
1428 			return -ENOMEM;
1429 		zcrypt_perdev_reqcnt(reqcnt, AP_DEVICES);
1430 		if (copy_to_user((int __user *) arg, reqcnt, sizeof(reqcnt)))
1431 			rc = -EFAULT;
1432 		kfree(reqcnt);
1433 		return rc;
1434 	}
1435 	case Z90STAT_REQUESTQ_COUNT:
1436 		return put_user(zcrypt_requestq_count(), (int __user *) arg);
1437 	case Z90STAT_PENDINGQ_COUNT:
1438 		return put_user(zcrypt_pendingq_count(), (int __user *) arg);
1439 	case Z90STAT_TOTALOPEN_COUNT:
1440 		return put_user(atomic_read(&zcrypt_open_count),
1441 				(int __user *) arg);
1442 	case Z90STAT_DOMAIN_INDEX:
1443 		return put_user(ap_domain_index, (int __user *) arg);
1444 	/*
1445 	 * Deprecated ioctls
1446 	 */
1447 	case ZDEVICESTATUS: {
1448 		/* the old ioctl supports only 64 adapters */
1449 		struct zcrypt_device_status *device_status;
1450 		size_t total_size = MAX_ZDEV_ENTRIES
1451 			* sizeof(struct zcrypt_device_status);
1452 
1453 		device_status = kzalloc(total_size, GFP_KERNEL);
1454 		if (!device_status)
1455 			return -ENOMEM;
1456 		zcrypt_device_status_mask(device_status);
1457 		if (copy_to_user((char __user *) arg, device_status,
1458 				 total_size))
1459 			rc = -EFAULT;
1460 		kfree(device_status);
1461 		return rc;
1462 	}
1463 	case Z90STAT_STATUS_MASK: {
1464 		/* the old ioctl supports only 64 adapters */
1465 		char status[MAX_ZDEV_CARDIDS];
1466 
1467 		zcrypt_status_mask(status, MAX_ZDEV_CARDIDS);
1468 		if (copy_to_user((char __user *) arg, status, sizeof(status)))
1469 			return -EFAULT;
1470 		return 0;
1471 	}
1472 	case Z90STAT_QDEPTH_MASK: {
1473 		/* the old ioctl supports only 64 adapters */
1474 		char qdepth[MAX_ZDEV_CARDIDS];
1475 
1476 		zcrypt_qdepth_mask(qdepth, MAX_ZDEV_CARDIDS);
1477 		if (copy_to_user((char __user *) arg, qdepth, sizeof(qdepth)))
1478 			return -EFAULT;
1479 		return 0;
1480 	}
1481 	case Z90STAT_PERDEV_REQCNT: {
1482 		/* the old ioctl supports only 64 adapters */
1483 		int reqcnt[MAX_ZDEV_CARDIDS];
1484 
1485 		zcrypt_perdev_reqcnt(reqcnt, MAX_ZDEV_CARDIDS);
1486 		if (copy_to_user((int __user *) arg, reqcnt, sizeof(reqcnt)))
1487 			return -EFAULT;
1488 		return 0;
1489 	}
1490 	/* unknown ioctl number */
1491 	default:
1492 		ZCRYPT_DBF(DBF_DEBUG, "unknown ioctl 0x%08x\n", cmd);
1493 		return -ENOIOCTLCMD;
1494 	}
1495 }
1496 
1497 #ifdef CONFIG_COMPAT
1498 /*
1499  * ioctl32 conversion routines
1500  */
1501 struct compat_ica_rsa_modexpo {
1502 	compat_uptr_t	inputdata;
1503 	unsigned int	inputdatalength;
1504 	compat_uptr_t	outputdata;
1505 	unsigned int	outputdatalength;
1506 	compat_uptr_t	b_key;
1507 	compat_uptr_t	n_modulus;
1508 };
1509 
1510 static long trans_modexpo32(struct ap_perms *perms, struct file *filp,
1511 			    unsigned int cmd, unsigned long arg)
1512 {
1513 	struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg);
1514 	struct compat_ica_rsa_modexpo mex32;
1515 	struct ica_rsa_modexpo mex64;
1516 	long rc;
1517 
1518 	if (copy_from_user(&mex32, umex32, sizeof(mex32)))
1519 		return -EFAULT;
1520 	mex64.inputdata = compat_ptr(mex32.inputdata);
1521 	mex64.inputdatalength = mex32.inputdatalength;
1522 	mex64.outputdata = compat_ptr(mex32.outputdata);
1523 	mex64.outputdatalength = mex32.outputdatalength;
1524 	mex64.b_key = compat_ptr(mex32.b_key);
1525 	mex64.n_modulus = compat_ptr(mex32.n_modulus);
1526 	do {
1527 		rc = zcrypt_rsa_modexpo(perms, &mex64);
1528 	} while (rc == -EAGAIN);
1529 	/* on failure: retry once again after a requested rescan */
1530 	if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1531 		do {
1532 			rc = zcrypt_rsa_modexpo(perms, &mex64);
1533 		} while (rc == -EAGAIN);
1534 	if (rc)
1535 		return rc;
1536 	return put_user(mex64.outputdatalength,
1537 			&umex32->outputdatalength);
1538 }
1539 
1540 struct compat_ica_rsa_modexpo_crt {
1541 	compat_uptr_t	inputdata;
1542 	unsigned int	inputdatalength;
1543 	compat_uptr_t	outputdata;
1544 	unsigned int	outputdatalength;
1545 	compat_uptr_t	bp_key;
1546 	compat_uptr_t	bq_key;
1547 	compat_uptr_t	np_prime;
1548 	compat_uptr_t	nq_prime;
1549 	compat_uptr_t	u_mult_inv;
1550 };
1551 
1552 static long trans_modexpo_crt32(struct ap_perms *perms, struct file *filp,
1553 				unsigned int cmd, unsigned long arg)
1554 {
1555 	struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg);
1556 	struct compat_ica_rsa_modexpo_crt crt32;
1557 	struct ica_rsa_modexpo_crt crt64;
1558 	long rc;
1559 
1560 	if (copy_from_user(&crt32, ucrt32, sizeof(crt32)))
1561 		return -EFAULT;
1562 	crt64.inputdata = compat_ptr(crt32.inputdata);
1563 	crt64.inputdatalength = crt32.inputdatalength;
1564 	crt64.outputdata = compat_ptr(crt32.outputdata);
1565 	crt64.outputdatalength = crt32.outputdatalength;
1566 	crt64.bp_key = compat_ptr(crt32.bp_key);
1567 	crt64.bq_key = compat_ptr(crt32.bq_key);
1568 	crt64.np_prime = compat_ptr(crt32.np_prime);
1569 	crt64.nq_prime = compat_ptr(crt32.nq_prime);
1570 	crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv);
1571 	do {
1572 		rc = zcrypt_rsa_crt(perms, &crt64);
1573 	} while (rc == -EAGAIN);
1574 	/* on failure: retry once again after a requested rescan */
1575 	if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1576 		do {
1577 			rc = zcrypt_rsa_crt(perms, &crt64);
1578 		} while (rc == -EAGAIN);
1579 	if (rc)
1580 		return rc;
1581 	return put_user(crt64.outputdatalength,
1582 			&ucrt32->outputdatalength);
1583 }
1584 
1585 struct compat_ica_xcRB {
1586 	unsigned short	agent_ID;
1587 	unsigned int	user_defined;
1588 	unsigned short	request_ID;
1589 	unsigned int	request_control_blk_length;
1590 	unsigned char	padding1[16 - sizeof(compat_uptr_t)];
1591 	compat_uptr_t	request_control_blk_addr;
1592 	unsigned int	request_data_length;
1593 	char		padding2[16 - sizeof(compat_uptr_t)];
1594 	compat_uptr_t	request_data_address;
1595 	unsigned int	reply_control_blk_length;
1596 	char		padding3[16 - sizeof(compat_uptr_t)];
1597 	compat_uptr_t	reply_control_blk_addr;
1598 	unsigned int	reply_data_length;
1599 	char		padding4[16 - sizeof(compat_uptr_t)];
1600 	compat_uptr_t	reply_data_addr;
1601 	unsigned short	priority_window;
1602 	unsigned int	status;
1603 } __packed;
1604 
1605 static long trans_xcRB32(struct ap_perms *perms, struct file *filp,
1606 			 unsigned int cmd, unsigned long arg)
1607 {
1608 	struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg);
1609 	struct compat_ica_xcRB xcRB32;
1610 	struct ica_xcRB xcRB64;
1611 	long rc;
1612 
1613 	if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32)))
1614 		return -EFAULT;
1615 	xcRB64.agent_ID = xcRB32.agent_ID;
1616 	xcRB64.user_defined = xcRB32.user_defined;
1617 	xcRB64.request_ID = xcRB32.request_ID;
1618 	xcRB64.request_control_blk_length =
1619 		xcRB32.request_control_blk_length;
1620 	xcRB64.request_control_blk_addr =
1621 		compat_ptr(xcRB32.request_control_blk_addr);
1622 	xcRB64.request_data_length =
1623 		xcRB32.request_data_length;
1624 	xcRB64.request_data_address =
1625 		compat_ptr(xcRB32.request_data_address);
1626 	xcRB64.reply_control_blk_length =
1627 		xcRB32.reply_control_blk_length;
1628 	xcRB64.reply_control_blk_addr =
1629 		compat_ptr(xcRB32.reply_control_blk_addr);
1630 	xcRB64.reply_data_length = xcRB32.reply_data_length;
1631 	xcRB64.reply_data_addr =
1632 		compat_ptr(xcRB32.reply_data_addr);
1633 	xcRB64.priority_window = xcRB32.priority_window;
1634 	xcRB64.status = xcRB32.status;
1635 	do {
1636 		rc = _zcrypt_send_cprb(perms, &xcRB64);
1637 	} while (rc == -EAGAIN);
1638 	/* on failure: retry once again after a requested rescan */
1639 	if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1640 		do {
1641 			rc = _zcrypt_send_cprb(perms, &xcRB64);
1642 		} while (rc == -EAGAIN);
1643 	xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length;
1644 	xcRB32.reply_data_length = xcRB64.reply_data_length;
1645 	xcRB32.status = xcRB64.status;
1646 	if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32)))
1647 		return -EFAULT;
1648 	return rc;
1649 }
1650 
1651 static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd,
1652 			 unsigned long arg)
1653 {
1654 	int rc;
1655 	struct ap_perms *perms =
1656 		(struct ap_perms *) filp->private_data;
1657 
1658 	rc = zcrypt_check_ioctl(perms, cmd);
1659 	if (rc)
1660 		return rc;
1661 
1662 	if (cmd == ICARSAMODEXPO)
1663 		return trans_modexpo32(perms, filp, cmd, arg);
1664 	if (cmd == ICARSACRT)
1665 		return trans_modexpo_crt32(perms, filp, cmd, arg);
1666 	if (cmd == ZSECSENDCPRB)
1667 		return trans_xcRB32(perms, filp, cmd, arg);
1668 	return zcrypt_unlocked_ioctl(filp, cmd, arg);
1669 }
1670 #endif
1671 
1672 /*
1673  * Misc device file operations.
1674  */
1675 static const struct file_operations zcrypt_fops = {
1676 	.owner		= THIS_MODULE,
1677 	.read		= zcrypt_read,
1678 	.write		= zcrypt_write,
1679 	.unlocked_ioctl	= zcrypt_unlocked_ioctl,
1680 #ifdef CONFIG_COMPAT
1681 	.compat_ioctl	= zcrypt_compat_ioctl,
1682 #endif
1683 	.open		= zcrypt_open,
1684 	.release	= zcrypt_release,
1685 	.llseek		= no_llseek,
1686 };
1687 
1688 /*
1689  * Misc device.
1690  */
1691 static struct miscdevice zcrypt_misc_device = {
1692 	.minor	    = MISC_DYNAMIC_MINOR,
1693 	.name	    = "z90crypt",
1694 	.fops	    = &zcrypt_fops,
1695 };
1696 
1697 static int zcrypt_rng_device_count;
1698 static u32 *zcrypt_rng_buffer;
1699 static int zcrypt_rng_buffer_index;
1700 static DEFINE_MUTEX(zcrypt_rng_mutex);
1701 
1702 static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
1703 {
1704 	int rc;
1705 
1706 	/*
1707 	 * We don't need locking here because the RNG API guarantees serialized
1708 	 * read method calls.
1709 	 */
1710 	if (zcrypt_rng_buffer_index == 0) {
1711 		rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1712 		/* on failure: retry once again after a requested rescan */
1713 		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1714 			rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1715 		if (rc < 0)
1716 			return -EIO;
1717 		zcrypt_rng_buffer_index = rc / sizeof(*data);
1718 	}
1719 	*data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index];
1720 	return sizeof(*data);
1721 }
1722 
1723 static struct hwrng zcrypt_rng_dev = {
1724 	.name		= "zcrypt",
1725 	.data_read	= zcrypt_rng_data_read,
1726 	.quality	= 990,
1727 };
1728 
1729 int zcrypt_rng_device_add(void)
1730 {
1731 	int rc = 0;
1732 
1733 	mutex_lock(&zcrypt_rng_mutex);
1734 	if (zcrypt_rng_device_count == 0) {
1735 		zcrypt_rng_buffer = (u32 *) get_zeroed_page(GFP_KERNEL);
1736 		if (!zcrypt_rng_buffer) {
1737 			rc = -ENOMEM;
1738 			goto out;
1739 		}
1740 		zcrypt_rng_buffer_index = 0;
1741 		if (!zcrypt_hwrng_seed)
1742 			zcrypt_rng_dev.quality = 0;
1743 		rc = hwrng_register(&zcrypt_rng_dev);
1744 		if (rc)
1745 			goto out_free;
1746 		zcrypt_rng_device_count = 1;
1747 	} else
1748 		zcrypt_rng_device_count++;
1749 	mutex_unlock(&zcrypt_rng_mutex);
1750 	return 0;
1751 
1752 out_free:
1753 	free_page((unsigned long) zcrypt_rng_buffer);
1754 out:
1755 	mutex_unlock(&zcrypt_rng_mutex);
1756 	return rc;
1757 }
1758 
1759 void zcrypt_rng_device_remove(void)
1760 {
1761 	mutex_lock(&zcrypt_rng_mutex);
1762 	zcrypt_rng_device_count--;
1763 	if (zcrypt_rng_device_count == 0) {
1764 		hwrng_unregister(&zcrypt_rng_dev);
1765 		free_page((unsigned long) zcrypt_rng_buffer);
1766 	}
1767 	mutex_unlock(&zcrypt_rng_mutex);
1768 }
1769 
1770 int __init zcrypt_debug_init(void)
1771 {
1772 	zcrypt_dbf_info = debug_register("zcrypt", 1, 1,
1773 					 DBF_MAX_SPRINTF_ARGS * sizeof(long));
1774 	debug_register_view(zcrypt_dbf_info, &debug_sprintf_view);
1775 	debug_set_level(zcrypt_dbf_info, DBF_ERR);
1776 
1777 	return 0;
1778 }
1779 
1780 void zcrypt_debug_exit(void)
1781 {
1782 	debug_unregister(zcrypt_dbf_info);
1783 }
1784 
1785 #ifdef CONFIG_ZCRYPT_MULTIDEVNODES
1786 
1787 static int __init zcdn_init(void)
1788 {
1789 	int rc;
1790 
1791 	/* create a new class 'zcrypt' */
1792 	zcrypt_class = class_create(THIS_MODULE, ZCRYPT_NAME);
1793 	if (IS_ERR(zcrypt_class)) {
1794 		rc = PTR_ERR(zcrypt_class);
1795 		goto out_class_create_failed;
1796 	}
1797 	zcrypt_class->dev_release = zcdn_device_release;
1798 
1799 	/* alloc device minor range */
1800 	rc = alloc_chrdev_region(&zcrypt_devt,
1801 				 0, ZCRYPT_MAX_MINOR_NODES,
1802 				 ZCRYPT_NAME);
1803 	if (rc)
1804 		goto out_alloc_chrdev_failed;
1805 
1806 	cdev_init(&zcrypt_cdev, &zcrypt_fops);
1807 	zcrypt_cdev.owner = THIS_MODULE;
1808 	rc = cdev_add(&zcrypt_cdev, zcrypt_devt, ZCRYPT_MAX_MINOR_NODES);
1809 	if (rc)
1810 		goto out_cdev_add_failed;
1811 
1812 	/* need some class specific sysfs attributes */
1813 	rc = class_create_file(zcrypt_class, &class_attr_zcdn_create);
1814 	if (rc)
1815 		goto out_class_create_file_1_failed;
1816 	rc = class_create_file(zcrypt_class, &class_attr_zcdn_destroy);
1817 	if (rc)
1818 		goto out_class_create_file_2_failed;
1819 
1820 	return 0;
1821 
1822 out_class_create_file_2_failed:
1823 	class_remove_file(zcrypt_class, &class_attr_zcdn_create);
1824 out_class_create_file_1_failed:
1825 	cdev_del(&zcrypt_cdev);
1826 out_cdev_add_failed:
1827 	unregister_chrdev_region(zcrypt_devt, ZCRYPT_MAX_MINOR_NODES);
1828 out_alloc_chrdev_failed:
1829 	class_destroy(zcrypt_class);
1830 out_class_create_failed:
1831 	return rc;
1832 }
1833 
1834 static void zcdn_exit(void)
1835 {
1836 	class_remove_file(zcrypt_class, &class_attr_zcdn_create);
1837 	class_remove_file(zcrypt_class, &class_attr_zcdn_destroy);
1838 	zcdn_destroy_all();
1839 	cdev_del(&zcrypt_cdev);
1840 	unregister_chrdev_region(zcrypt_devt, ZCRYPT_MAX_MINOR_NODES);
1841 	class_destroy(zcrypt_class);
1842 }
1843 
1844 #endif
1845 
1846 /**
1847  * zcrypt_api_init(): Module initialization.
1848  *
1849  * The module initialization code.
1850  */
1851 int __init zcrypt_api_init(void)
1852 {
1853 	int rc;
1854 
1855 	rc = zcrypt_debug_init();
1856 	if (rc)
1857 		goto out;
1858 
1859 #ifdef CONFIG_ZCRYPT_MULTIDEVNODES
1860 	rc = zcdn_init();
1861 	if (rc)
1862 		goto out;
1863 #endif
1864 
1865 	/* Register the request sprayer. */
1866 	rc = misc_register(&zcrypt_misc_device);
1867 	if (rc < 0)
1868 		goto out_misc_register_failed;
1869 
1870 	zcrypt_msgtype6_init();
1871 	zcrypt_msgtype50_init();
1872 
1873 	return 0;
1874 
1875 out_misc_register_failed:
1876 #ifdef CONFIG_ZCRYPT_MULTIDEVNODES
1877 	zcdn_exit();
1878 #endif
1879 	zcrypt_debug_exit();
1880 out:
1881 	return rc;
1882 }
1883 
1884 /**
1885  * zcrypt_api_exit(): Module termination.
1886  *
1887  * The module termination code.
1888  */
1889 void __exit zcrypt_api_exit(void)
1890 {
1891 #ifdef CONFIG_ZCRYPT_MULTIDEVNODES
1892 	zcdn_exit();
1893 #endif
1894 	misc_deregister(&zcrypt_misc_device);
1895 	zcrypt_msgtype6_exit();
1896 	zcrypt_msgtype50_exit();
1897 	zcrypt_ccamisc_exit();
1898 	zcrypt_ep11misc_exit();
1899 	zcrypt_debug_exit();
1900 }
1901 
1902 module_init(zcrypt_api_init);
1903 module_exit(zcrypt_api_exit);
1904