xref: /openbmc/linux/drivers/s390/crypto/zcrypt_api.c (revision 6aa7de05)
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 <linux/uaccess.h>
40 #include <linux/hw_random.h>
41 #include <linux/debugfs.h>
42 #include <asm/debug.h>
43 
44 #define CREATE_TRACE_POINTS
45 #include <asm/trace/zcrypt.h>
46 
47 #include "zcrypt_api.h"
48 #include "zcrypt_debug.h"
49 
50 #include "zcrypt_msgtype6.h"
51 #include "zcrypt_msgtype50.h"
52 
53 /*
54  * Module description.
55  */
56 MODULE_AUTHOR("IBM Corporation");
57 MODULE_DESCRIPTION("Cryptographic Coprocessor interface, " \
58 		   "Copyright IBM Corp. 2001, 2012");
59 MODULE_LICENSE("GPL");
60 
61 /*
62  * zcrypt tracepoint functions
63  */
64 EXPORT_TRACEPOINT_SYMBOL(s390_zcrypt_req);
65 EXPORT_TRACEPOINT_SYMBOL(s390_zcrypt_rep);
66 
67 static int zcrypt_hwrng_seed = 1;
68 module_param_named(hwrng_seed, zcrypt_hwrng_seed, int, S_IRUSR|S_IRGRP);
69 MODULE_PARM_DESC(hwrng_seed, "Turn on/off hwrng auto seed, default is 1 (on).");
70 
71 DEFINE_SPINLOCK(zcrypt_list_lock);
72 LIST_HEAD(zcrypt_card_list);
73 int zcrypt_device_count;
74 
75 static atomic_t zcrypt_open_count = ATOMIC_INIT(0);
76 static atomic_t zcrypt_rescan_count = ATOMIC_INIT(0);
77 
78 atomic_t zcrypt_rescan_req = ATOMIC_INIT(0);
79 EXPORT_SYMBOL(zcrypt_rescan_req);
80 
81 static LIST_HEAD(zcrypt_ops_list);
82 
83 /* Zcrypt related debug feature stuff. */
84 debug_info_t *zcrypt_dbf_info;
85 
86 /**
87  * Process a rescan of the transport layer.
88  *
89  * Returns 1, if the rescan has been processed, otherwise 0.
90  */
91 static inline int zcrypt_process_rescan(void)
92 {
93 	if (atomic_read(&zcrypt_rescan_req)) {
94 		atomic_set(&zcrypt_rescan_req, 0);
95 		atomic_inc(&zcrypt_rescan_count);
96 		ap_bus_force_rescan();
97 		ZCRYPT_DBF(DBF_INFO, "rescan count=%07d\n",
98 			   atomic_inc_return(&zcrypt_rescan_count));
99 		return 1;
100 	}
101 	return 0;
102 }
103 
104 void zcrypt_msgtype_register(struct zcrypt_ops *zops)
105 {
106 	list_add_tail(&zops->list, &zcrypt_ops_list);
107 }
108 
109 void zcrypt_msgtype_unregister(struct zcrypt_ops *zops)
110 {
111 	list_del_init(&zops->list);
112 }
113 
114 struct zcrypt_ops *zcrypt_msgtype(unsigned char *name, int variant)
115 {
116 	struct zcrypt_ops *zops;
117 
118 	list_for_each_entry(zops, &zcrypt_ops_list, list)
119 		if ((zops->variant == variant) &&
120 		    (!strncmp(zops->name, name, sizeof(zops->name))))
121 			return zops;
122 	return NULL;
123 }
124 EXPORT_SYMBOL(zcrypt_msgtype);
125 
126 /**
127  * zcrypt_read (): Not supported beyond zcrypt 1.3.1.
128  *
129  * This function is not supported beyond zcrypt 1.3.1.
130  */
131 static ssize_t zcrypt_read(struct file *filp, char __user *buf,
132 			   size_t count, loff_t *f_pos)
133 {
134 	return -EPERM;
135 }
136 
137 /**
138  * zcrypt_write(): Not allowed.
139  *
140  * Write is is not allowed
141  */
142 static ssize_t zcrypt_write(struct file *filp, const char __user *buf,
143 			    size_t count, loff_t *f_pos)
144 {
145 	return -EPERM;
146 }
147 
148 /**
149  * zcrypt_open(): Count number of users.
150  *
151  * Device open function to count number of users.
152  */
153 static int zcrypt_open(struct inode *inode, struct file *filp)
154 {
155 	atomic_inc(&zcrypt_open_count);
156 	return nonseekable_open(inode, filp);
157 }
158 
159 /**
160  * zcrypt_release(): Count number of users.
161  *
162  * Device close function to count number of users.
163  */
164 static int zcrypt_release(struct inode *inode, struct file *filp)
165 {
166 	atomic_dec(&zcrypt_open_count);
167 	return 0;
168 }
169 
170 static inline struct zcrypt_queue *zcrypt_pick_queue(struct zcrypt_card *zc,
171 						     struct zcrypt_queue *zq,
172 						     unsigned int weight)
173 {
174 	if (!zq || !try_module_get(zq->queue->ap_dev.drv->driver.owner))
175 		return NULL;
176 	zcrypt_queue_get(zq);
177 	get_device(&zq->queue->ap_dev.device);
178 	atomic_add(weight, &zc->load);
179 	atomic_add(weight, &zq->load);
180 	zq->request_count++;
181 	return zq;
182 }
183 
184 static inline void zcrypt_drop_queue(struct zcrypt_card *zc,
185 				     struct zcrypt_queue *zq,
186 				     unsigned int weight)
187 {
188 	struct module *mod = zq->queue->ap_dev.drv->driver.owner;
189 
190 	zq->request_count--;
191 	atomic_sub(weight, &zc->load);
192 	atomic_sub(weight, &zq->load);
193 	put_device(&zq->queue->ap_dev.device);
194 	zcrypt_queue_put(zq);
195 	module_put(mod);
196 }
197 
198 static inline bool zcrypt_card_compare(struct zcrypt_card *zc,
199 				       struct zcrypt_card *pref_zc,
200 				       unsigned weight, unsigned pref_weight)
201 {
202 	if (!pref_zc)
203 		return false;
204 	weight += atomic_read(&zc->load);
205 	pref_weight += atomic_read(&pref_zc->load);
206 	if (weight == pref_weight)
207 		return atomic_read(&zc->card->total_request_count) >
208 			atomic_read(&pref_zc->card->total_request_count);
209 	return weight > pref_weight;
210 }
211 
212 static inline bool zcrypt_queue_compare(struct zcrypt_queue *zq,
213 					struct zcrypt_queue *pref_zq,
214 					unsigned weight, unsigned pref_weight)
215 {
216 	if (!pref_zq)
217 		return false;
218 	weight += atomic_read(&zq->load);
219 	pref_weight += atomic_read(&pref_zq->load);
220 	if (weight == pref_weight)
221 		return &zq->queue->total_request_count >
222 			&pref_zq->queue->total_request_count;
223 	return weight > pref_weight;
224 }
225 
226 /*
227  * zcrypt ioctls.
228  */
229 static long zcrypt_rsa_modexpo(struct ica_rsa_modexpo *mex)
230 {
231 	struct zcrypt_card *zc, *pref_zc;
232 	struct zcrypt_queue *zq, *pref_zq;
233 	unsigned int weight, pref_weight;
234 	unsigned int func_code;
235 	int qid = 0, rc = -ENODEV;
236 
237 	trace_s390_zcrypt_req(mex, TP_ICARSAMODEXPO);
238 
239 	if (mex->outputdatalength < mex->inputdatalength) {
240 		rc = -EINVAL;
241 		goto out;
242 	}
243 
244 	/*
245 	 * As long as outputdatalength is big enough, we can set the
246 	 * outputdatalength equal to the inputdatalength, since that is the
247 	 * number of bytes we will copy in any case
248 	 */
249 	mex->outputdatalength = mex->inputdatalength;
250 
251 	rc = get_rsa_modex_fc(mex, &func_code);
252 	if (rc)
253 		goto out;
254 
255 	pref_zc = NULL;
256 	pref_zq = NULL;
257 	spin_lock(&zcrypt_list_lock);
258 	for_each_zcrypt_card(zc) {
259 		/* Check for online accelarator and CCA cards */
260 		if (!zc->online || !(zc->card->functions & 0x18000000))
261 			continue;
262 		/* Check for size limits */
263 		if (zc->min_mod_size > mex->inputdatalength ||
264 		    zc->max_mod_size < mex->inputdatalength)
265 			continue;
266 		/* get weight index of the card device	*/
267 		weight = zc->speed_rating[func_code];
268 		if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
269 			continue;
270 		for_each_zcrypt_queue(zq, zc) {
271 			/* check if device is online and eligible */
272 			if (!zq->online || !zq->ops->rsa_modexpo)
273 				continue;
274 			if (zcrypt_queue_compare(zq, pref_zq,
275 						 weight, pref_weight))
276 				continue;
277 			pref_zc = zc;
278 			pref_zq = zq;
279 			pref_weight = weight;
280 		}
281 	}
282 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, weight);
283 	spin_unlock(&zcrypt_list_lock);
284 
285 	if (!pref_zq) {
286 		rc = -ENODEV;
287 		goto out;
288 	}
289 
290 	qid = pref_zq->queue->qid;
291 	rc = pref_zq->ops->rsa_modexpo(pref_zq, mex);
292 
293 	spin_lock(&zcrypt_list_lock);
294 	zcrypt_drop_queue(pref_zc, pref_zq, weight);
295 	spin_unlock(&zcrypt_list_lock);
296 
297 out:
298 	trace_s390_zcrypt_rep(mex, func_code, rc,
299 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
300 	return rc;
301 }
302 
303 static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt)
304 {
305 	struct zcrypt_card *zc, *pref_zc;
306 	struct zcrypt_queue *zq, *pref_zq;
307 	unsigned int weight, pref_weight;
308 	unsigned int func_code;
309 	int qid = 0, rc = -ENODEV;
310 
311 	trace_s390_zcrypt_req(crt, TP_ICARSACRT);
312 
313 	if (crt->outputdatalength < crt->inputdatalength) {
314 		rc = -EINVAL;
315 		goto out;
316 	}
317 
318 	/*
319 	 * As long as outputdatalength is big enough, we can set the
320 	 * outputdatalength equal to the inputdatalength, since that is the
321 	 * number of bytes we will copy in any case
322 	 */
323 	crt->outputdatalength = crt->inputdatalength;
324 
325 	rc = get_rsa_crt_fc(crt, &func_code);
326 	if (rc)
327 		goto out;
328 
329 	pref_zc = NULL;
330 	pref_zq = NULL;
331 	spin_lock(&zcrypt_list_lock);
332 	for_each_zcrypt_card(zc) {
333 		/* Check for online accelarator and CCA cards */
334 		if (!zc->online || !(zc->card->functions & 0x18000000))
335 			continue;
336 		/* Check for size limits */
337 		if (zc->min_mod_size > crt->inputdatalength ||
338 		    zc->max_mod_size < crt->inputdatalength)
339 			continue;
340 		/* get weight index of the card device	*/
341 		weight = zc->speed_rating[func_code];
342 		if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
343 			continue;
344 		for_each_zcrypt_queue(zq, zc) {
345 			/* check if device is online and eligible */
346 			if (!zq->online || !zq->ops->rsa_modexpo_crt)
347 				continue;
348 			if (zcrypt_queue_compare(zq, pref_zq,
349 						 weight, pref_weight))
350 				continue;
351 			pref_zc = zc;
352 			pref_zq = zq;
353 			pref_weight = weight;
354 		}
355 	}
356 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, weight);
357 	spin_unlock(&zcrypt_list_lock);
358 
359 	if (!pref_zq) {
360 		rc = -ENODEV;
361 		goto out;
362 	}
363 
364 	qid = pref_zq->queue->qid;
365 	rc = pref_zq->ops->rsa_modexpo_crt(pref_zq, crt);
366 
367 	spin_lock(&zcrypt_list_lock);
368 	zcrypt_drop_queue(pref_zc, pref_zq, weight);
369 	spin_unlock(&zcrypt_list_lock);
370 
371 out:
372 	trace_s390_zcrypt_rep(crt, func_code, rc,
373 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
374 	return rc;
375 }
376 
377 long zcrypt_send_cprb(struct ica_xcRB *xcRB)
378 {
379 	struct zcrypt_card *zc, *pref_zc;
380 	struct zcrypt_queue *zq, *pref_zq;
381 	struct ap_message ap_msg;
382 	unsigned int weight, pref_weight;
383 	unsigned int func_code;
384 	unsigned short *domain;
385 	int qid = 0, rc = -ENODEV;
386 
387 	trace_s390_zcrypt_req(xcRB, TB_ZSECSENDCPRB);
388 
389 	rc = get_cprb_fc(xcRB, &ap_msg, &func_code, &domain);
390 	if (rc)
391 		goto out;
392 
393 	pref_zc = NULL;
394 	pref_zq = NULL;
395 	spin_lock(&zcrypt_list_lock);
396 	for_each_zcrypt_card(zc) {
397 		/* Check for online CCA cards */
398 		if (!zc->online || !(zc->card->functions & 0x10000000))
399 			continue;
400 		/* Check for user selected CCA card */
401 		if (xcRB->user_defined != AUTOSELECT &&
402 		    xcRB->user_defined != zc->card->id)
403 			continue;
404 		/* get weight index of the card device	*/
405 		weight = speed_idx_cca(func_code) * zc->speed_rating[SECKEY];
406 		if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
407 			continue;
408 		for_each_zcrypt_queue(zq, zc) {
409 			/* check if device is online and eligible */
410 			if (!zq->online ||
411 			    !zq->ops->send_cprb ||
412 			    ((*domain != (unsigned short) AUTOSELECT) &&
413 			     (*domain != AP_QID_QUEUE(zq->queue->qid))))
414 				continue;
415 			if (zcrypt_queue_compare(zq, pref_zq,
416 						 weight, pref_weight))
417 				continue;
418 			pref_zc = zc;
419 			pref_zq = zq;
420 			pref_weight = weight;
421 		}
422 	}
423 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, weight);
424 	spin_unlock(&zcrypt_list_lock);
425 
426 	if (!pref_zq) {
427 		rc = -ENODEV;
428 		goto out;
429 	}
430 
431 	/* in case of auto select, provide the correct domain */
432 	qid = pref_zq->queue->qid;
433 	if (*domain == (unsigned short) AUTOSELECT)
434 		*domain = AP_QID_QUEUE(qid);
435 
436 	rc = pref_zq->ops->send_cprb(pref_zq, xcRB, &ap_msg);
437 
438 	spin_lock(&zcrypt_list_lock);
439 	zcrypt_drop_queue(pref_zc, pref_zq, weight);
440 	spin_unlock(&zcrypt_list_lock);
441 
442 out:
443 	trace_s390_zcrypt_rep(xcRB, func_code, rc,
444 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
445 	return rc;
446 }
447 EXPORT_SYMBOL(zcrypt_send_cprb);
448 
449 static bool is_desired_ep11_card(unsigned int dev_id,
450 				 unsigned short target_num,
451 				 struct ep11_target_dev *targets)
452 {
453 	while (target_num-- > 0) {
454 		if (dev_id == targets->ap_id)
455 			return true;
456 		targets++;
457 	}
458 	return false;
459 }
460 
461 static bool is_desired_ep11_queue(unsigned int dev_qid,
462 				  unsigned short target_num,
463 				  struct ep11_target_dev *targets)
464 {
465 	while (target_num-- > 0) {
466 		if (AP_MKQID(targets->ap_id, targets->dom_id) == dev_qid)
467 			return true;
468 		targets++;
469 	}
470 	return false;
471 }
472 
473 static long zcrypt_send_ep11_cprb(struct ep11_urb *xcrb)
474 {
475 	struct zcrypt_card *zc, *pref_zc;
476 	struct zcrypt_queue *zq, *pref_zq;
477 	struct ep11_target_dev *targets;
478 	unsigned short target_num;
479 	unsigned int weight, pref_weight;
480 	unsigned int func_code;
481 	struct ap_message ap_msg;
482 	int qid = 0, rc = -ENODEV;
483 
484 	trace_s390_zcrypt_req(xcrb, TP_ZSENDEP11CPRB);
485 
486 	target_num = (unsigned short) xcrb->targets_num;
487 
488 	/* empty list indicates autoselect (all available targets) */
489 	targets = NULL;
490 	if (target_num != 0) {
491 		struct ep11_target_dev __user *uptr;
492 
493 		targets = kcalloc(target_num, sizeof(*targets), GFP_KERNEL);
494 		if (!targets) {
495 			rc = -ENOMEM;
496 			goto out;
497 		}
498 
499 		uptr = (struct ep11_target_dev __force __user *) xcrb->targets;
500 		if (copy_from_user(targets, uptr,
501 				   target_num * sizeof(*targets))) {
502 			rc = -EFAULT;
503 			goto out;
504 		}
505 	}
506 
507 	rc = get_ep11cprb_fc(xcrb, &ap_msg, &func_code);
508 	if (rc)
509 		goto out_free;
510 
511 	pref_zc = NULL;
512 	pref_zq = NULL;
513 	spin_lock(&zcrypt_list_lock);
514 	for_each_zcrypt_card(zc) {
515 		/* Check for online EP11 cards */
516 		if (!zc->online || !(zc->card->functions & 0x04000000))
517 			continue;
518 		/* Check for user selected EP11 card */
519 		if (targets &&
520 		    !is_desired_ep11_card(zc->card->id, target_num, targets))
521 			continue;
522 		/* get weight index of the card device	*/
523 		weight = speed_idx_ep11(func_code) * zc->speed_rating[SECKEY];
524 		if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
525 			continue;
526 		for_each_zcrypt_queue(zq, zc) {
527 			/* check if device is online and eligible */
528 			if (!zq->online ||
529 			    !zq->ops->send_ep11_cprb ||
530 			    (targets &&
531 			     !is_desired_ep11_queue(zq->queue->qid,
532 						    target_num, targets)))
533 				continue;
534 			if (zcrypt_queue_compare(zq, pref_zq,
535 						 weight, pref_weight))
536 				continue;
537 			pref_zc = zc;
538 			pref_zq = zq;
539 			pref_weight = weight;
540 		}
541 	}
542 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, weight);
543 	spin_unlock(&zcrypt_list_lock);
544 
545 	if (!pref_zq) {
546 		rc = -ENODEV;
547 		goto out_free;
548 	}
549 
550 	qid = pref_zq->queue->qid;
551 	rc = pref_zq->ops->send_ep11_cprb(pref_zq, xcrb, &ap_msg);
552 
553 	spin_lock(&zcrypt_list_lock);
554 	zcrypt_drop_queue(pref_zc, pref_zq, weight);
555 	spin_unlock(&zcrypt_list_lock);
556 
557 out_free:
558 	kfree(targets);
559 out:
560 	trace_s390_zcrypt_rep(xcrb, func_code, rc,
561 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
562 	return rc;
563 }
564 
565 static long zcrypt_rng(char *buffer)
566 {
567 	struct zcrypt_card *zc, *pref_zc;
568 	struct zcrypt_queue *zq, *pref_zq;
569 	unsigned int weight, pref_weight;
570 	unsigned int func_code;
571 	struct ap_message ap_msg;
572 	unsigned int domain;
573 	int qid = 0, rc = -ENODEV;
574 
575 	trace_s390_zcrypt_req(buffer, TP_HWRNGCPRB);
576 
577 	rc = get_rng_fc(&ap_msg, &func_code, &domain);
578 	if (rc)
579 		goto out;
580 
581 	pref_zc = NULL;
582 	pref_zq = NULL;
583 	spin_lock(&zcrypt_list_lock);
584 	for_each_zcrypt_card(zc) {
585 		/* Check for online CCA cards */
586 		if (!zc->online || !(zc->card->functions & 0x10000000))
587 			continue;
588 		/* get weight index of the card device	*/
589 		weight = zc->speed_rating[func_code];
590 		if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
591 			continue;
592 		for_each_zcrypt_queue(zq, zc) {
593 			/* check if device is online and eligible */
594 			if (!zq->online || !zq->ops->rng)
595 				continue;
596 			if (zcrypt_queue_compare(zq, pref_zq,
597 						 weight, pref_weight))
598 				continue;
599 			pref_zc = zc;
600 			pref_zq = zq;
601 			pref_weight = weight;
602 		}
603 	}
604 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, weight);
605 	spin_unlock(&zcrypt_list_lock);
606 
607 	if (!pref_zq)
608 		return -ENODEV;
609 
610 	qid = pref_zq->queue->qid;
611 	rc = pref_zq->ops->rng(pref_zq, buffer, &ap_msg);
612 
613 	spin_lock(&zcrypt_list_lock);
614 	zcrypt_drop_queue(pref_zc, pref_zq, weight);
615 	spin_unlock(&zcrypt_list_lock);
616 
617 out:
618 	trace_s390_zcrypt_rep(buffer, func_code, rc,
619 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
620 	return rc;
621 }
622 
623 void zcrypt_device_status_mask(struct zcrypt_device_matrix *matrix)
624 {
625 	struct zcrypt_card *zc;
626 	struct zcrypt_queue *zq;
627 	struct zcrypt_device_status *stat;
628 
629 	memset(matrix, 0, sizeof(*matrix));
630 	spin_lock(&zcrypt_list_lock);
631 	for_each_zcrypt_card(zc) {
632 		for_each_zcrypt_queue(zq, zc) {
633 			stat = matrix->device;
634 			stat += AP_QID_CARD(zq->queue->qid) * MAX_ZDEV_DOMAINS;
635 			stat += AP_QID_QUEUE(zq->queue->qid);
636 			stat->hwtype = zc->card->ap_dev.device_type;
637 			stat->functions = zc->card->functions >> 26;
638 			stat->qid = zq->queue->qid;
639 			stat->online = zq->online ? 0x01 : 0x00;
640 		}
641 	}
642 	spin_unlock(&zcrypt_list_lock);
643 }
644 EXPORT_SYMBOL(zcrypt_device_status_mask);
645 
646 static void zcrypt_status_mask(char status[AP_DEVICES])
647 {
648 	struct zcrypt_card *zc;
649 	struct zcrypt_queue *zq;
650 
651 	memset(status, 0, sizeof(char) * AP_DEVICES);
652 	spin_lock(&zcrypt_list_lock);
653 	for_each_zcrypt_card(zc) {
654 		for_each_zcrypt_queue(zq, zc) {
655 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index)
656 				continue;
657 			status[AP_QID_CARD(zq->queue->qid)] =
658 				zc->online ? zc->user_space_type : 0x0d;
659 		}
660 	}
661 	spin_unlock(&zcrypt_list_lock);
662 }
663 
664 static void zcrypt_qdepth_mask(char qdepth[AP_DEVICES])
665 {
666 	struct zcrypt_card *zc;
667 	struct zcrypt_queue *zq;
668 
669 	memset(qdepth, 0, sizeof(char)	* AP_DEVICES);
670 	spin_lock(&zcrypt_list_lock);
671 	local_bh_disable();
672 	for_each_zcrypt_card(zc) {
673 		for_each_zcrypt_queue(zq, zc) {
674 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index)
675 				continue;
676 			spin_lock(&zq->queue->lock);
677 			qdepth[AP_QID_CARD(zq->queue->qid)] =
678 				zq->queue->pendingq_count +
679 				zq->queue->requestq_count;
680 			spin_unlock(&zq->queue->lock);
681 		}
682 	}
683 	local_bh_enable();
684 	spin_unlock(&zcrypt_list_lock);
685 }
686 
687 static void zcrypt_perdev_reqcnt(int reqcnt[AP_DEVICES])
688 {
689 	struct zcrypt_card *zc;
690 	struct zcrypt_queue *zq;
691 
692 	memset(reqcnt, 0, sizeof(int) * AP_DEVICES);
693 	spin_lock(&zcrypt_list_lock);
694 	local_bh_disable();
695 	for_each_zcrypt_card(zc) {
696 		for_each_zcrypt_queue(zq, zc) {
697 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index)
698 				continue;
699 			spin_lock(&zq->queue->lock);
700 			reqcnt[AP_QID_CARD(zq->queue->qid)] =
701 				zq->queue->total_request_count;
702 			spin_unlock(&zq->queue->lock);
703 		}
704 	}
705 	local_bh_enable();
706 	spin_unlock(&zcrypt_list_lock);
707 }
708 
709 static int zcrypt_pendingq_count(void)
710 {
711 	struct zcrypt_card *zc;
712 	struct zcrypt_queue *zq;
713 	int pendingq_count;
714 
715 	pendingq_count = 0;
716 	spin_lock(&zcrypt_list_lock);
717 	local_bh_disable();
718 	for_each_zcrypt_card(zc) {
719 		for_each_zcrypt_queue(zq, zc) {
720 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index)
721 				continue;
722 			spin_lock(&zq->queue->lock);
723 			pendingq_count += zq->queue->pendingq_count;
724 			spin_unlock(&zq->queue->lock);
725 		}
726 	}
727 	local_bh_enable();
728 	spin_unlock(&zcrypt_list_lock);
729 	return pendingq_count;
730 }
731 
732 static int zcrypt_requestq_count(void)
733 {
734 	struct zcrypt_card *zc;
735 	struct zcrypt_queue *zq;
736 	int requestq_count;
737 
738 	requestq_count = 0;
739 	spin_lock(&zcrypt_list_lock);
740 	local_bh_disable();
741 	for_each_zcrypt_card(zc) {
742 		for_each_zcrypt_queue(zq, zc) {
743 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index)
744 				continue;
745 			spin_lock(&zq->queue->lock);
746 			requestq_count += zq->queue->requestq_count;
747 			spin_unlock(&zq->queue->lock);
748 		}
749 	}
750 	local_bh_enable();
751 	spin_unlock(&zcrypt_list_lock);
752 	return requestq_count;
753 }
754 
755 static int zcrypt_count_type(int type)
756 {
757 	struct zcrypt_card *zc;
758 	struct zcrypt_queue *zq;
759 	int device_count;
760 
761 	device_count = 0;
762 	spin_lock(&zcrypt_list_lock);
763 	for_each_zcrypt_card(zc) {
764 		if (zc->card->id != type)
765 			continue;
766 		for_each_zcrypt_queue(zq, zc) {
767 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index)
768 				continue;
769 			device_count++;
770 		}
771 	}
772 	spin_unlock(&zcrypt_list_lock);
773 	return device_count;
774 }
775 
776 /**
777  * zcrypt_ica_status(): Old, depracted combi status call.
778  *
779  * Old, deprecated combi status call.
780  */
781 static long zcrypt_ica_status(struct file *filp, unsigned long arg)
782 {
783 	struct ica_z90_status *pstat;
784 	int ret;
785 
786 	pstat = kzalloc(sizeof(*pstat), GFP_KERNEL);
787 	if (!pstat)
788 		return -ENOMEM;
789 	pstat->totalcount = zcrypt_device_count;
790 	pstat->leedslitecount = zcrypt_count_type(ZCRYPT_PCICA);
791 	pstat->leeds2count = zcrypt_count_type(ZCRYPT_PCICC);
792 	pstat->requestqWaitCount = zcrypt_requestq_count();
793 	pstat->pendingqWaitCount = zcrypt_pendingq_count();
794 	pstat->totalOpenCount = atomic_read(&zcrypt_open_count);
795 	pstat->cryptoDomain = ap_domain_index;
796 	zcrypt_status_mask(pstat->status);
797 	zcrypt_qdepth_mask(pstat->qdepth);
798 	ret = 0;
799 	if (copy_to_user((void __user *) arg, pstat, sizeof(*pstat)))
800 		ret = -EFAULT;
801 	kfree(pstat);
802 	return ret;
803 }
804 
805 static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
806 				  unsigned long arg)
807 {
808 	int rc;
809 
810 	switch (cmd) {
811 	case ICARSAMODEXPO: {
812 		struct ica_rsa_modexpo __user *umex = (void __user *) arg;
813 		struct ica_rsa_modexpo mex;
814 		if (copy_from_user(&mex, umex, sizeof(mex)))
815 			return -EFAULT;
816 		do {
817 			rc = zcrypt_rsa_modexpo(&mex);
818 		} while (rc == -EAGAIN);
819 		/* on failure: retry once again after a requested rescan */
820 		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
821 			do {
822 				rc = zcrypt_rsa_modexpo(&mex);
823 			} while (rc == -EAGAIN);
824 		if (rc) {
825 			ZCRYPT_DBF(DBF_DEBUG, "ioctl ICARSAMODEXPO rc=%d\n", rc);
826 			return rc;
827 		}
828 		return put_user(mex.outputdatalength, &umex->outputdatalength);
829 	}
830 	case ICARSACRT: {
831 		struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg;
832 		struct ica_rsa_modexpo_crt crt;
833 		if (copy_from_user(&crt, ucrt, sizeof(crt)))
834 			return -EFAULT;
835 		do {
836 			rc = zcrypt_rsa_crt(&crt);
837 		} while (rc == -EAGAIN);
838 		/* on failure: retry once again after a requested rescan */
839 		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
840 			do {
841 				rc = zcrypt_rsa_crt(&crt);
842 			} while (rc == -EAGAIN);
843 		if (rc) {
844 			ZCRYPT_DBF(DBF_DEBUG, "ioctl ICARSACRT rc=%d\n", rc);
845 			return rc;
846 		}
847 		return put_user(crt.outputdatalength, &ucrt->outputdatalength);
848 	}
849 	case ZSECSENDCPRB: {
850 		struct ica_xcRB __user *uxcRB = (void __user *) arg;
851 		struct ica_xcRB xcRB;
852 		if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB)))
853 			return -EFAULT;
854 		do {
855 			rc = zcrypt_send_cprb(&xcRB);
856 		} while (rc == -EAGAIN);
857 		/* on failure: retry once again after a requested rescan */
858 		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
859 			do {
860 				rc = zcrypt_send_cprb(&xcRB);
861 			} while (rc == -EAGAIN);
862 		if (rc)
863 			ZCRYPT_DBF(DBF_DEBUG, "ioctl ZSENDCPRB rc=%d\n", rc);
864 		if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB)))
865 			return -EFAULT;
866 		return rc;
867 	}
868 	case ZSENDEP11CPRB: {
869 		struct ep11_urb __user *uxcrb = (void __user *)arg;
870 		struct ep11_urb xcrb;
871 		if (copy_from_user(&xcrb, uxcrb, sizeof(xcrb)))
872 			return -EFAULT;
873 		do {
874 			rc = zcrypt_send_ep11_cprb(&xcrb);
875 		} while (rc == -EAGAIN);
876 		/* on failure: retry once again after a requested rescan */
877 		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
878 			do {
879 				rc = zcrypt_send_ep11_cprb(&xcrb);
880 			} while (rc == -EAGAIN);
881 		if (rc)
882 			ZCRYPT_DBF(DBF_DEBUG, "ioctl ZSENDEP11CPRB rc=%d\n", rc);
883 		if (copy_to_user(uxcrb, &xcrb, sizeof(xcrb)))
884 			return -EFAULT;
885 		return rc;
886 	}
887 	case ZDEVICESTATUS: {
888 		struct zcrypt_device_matrix *device_status;
889 
890 		device_status = kzalloc(sizeof(struct zcrypt_device_matrix),
891 					GFP_KERNEL);
892 		if (!device_status)
893 			return -ENOMEM;
894 
895 		zcrypt_device_status_mask(device_status);
896 
897 		if (copy_to_user((char __user *) arg, device_status,
898 				 sizeof(struct zcrypt_device_matrix))) {
899 			kfree(device_status);
900 			return -EFAULT;
901 		}
902 
903 		kfree(device_status);
904 		return 0;
905 	}
906 	case Z90STAT_STATUS_MASK: {
907 		char status[AP_DEVICES];
908 		zcrypt_status_mask(status);
909 		if (copy_to_user((char __user *) arg, status,
910 				 sizeof(char) * AP_DEVICES))
911 			return -EFAULT;
912 		return 0;
913 	}
914 	case Z90STAT_QDEPTH_MASK: {
915 		char qdepth[AP_DEVICES];
916 		zcrypt_qdepth_mask(qdepth);
917 		if (copy_to_user((char __user *) arg, qdepth,
918 				 sizeof(char) * AP_DEVICES))
919 			return -EFAULT;
920 		return 0;
921 	}
922 	case Z90STAT_PERDEV_REQCNT: {
923 		int reqcnt[AP_DEVICES];
924 		zcrypt_perdev_reqcnt(reqcnt);
925 		if (copy_to_user((int __user *) arg, reqcnt,
926 				 sizeof(int) * AP_DEVICES))
927 			return -EFAULT;
928 		return 0;
929 	}
930 	case Z90STAT_REQUESTQ_COUNT:
931 		return put_user(zcrypt_requestq_count(), (int __user *) arg);
932 	case Z90STAT_PENDINGQ_COUNT:
933 		return put_user(zcrypt_pendingq_count(), (int __user *) arg);
934 	case Z90STAT_TOTALOPEN_COUNT:
935 		return put_user(atomic_read(&zcrypt_open_count),
936 				(int __user *) arg);
937 	case Z90STAT_DOMAIN_INDEX:
938 		return put_user(ap_domain_index, (int __user *) arg);
939 	/*
940 	 * Deprecated ioctls. Don't add another device count ioctl,
941 	 * you can count them yourself in the user space with the
942 	 * output of the Z90STAT_STATUS_MASK ioctl.
943 	 */
944 	case ICAZ90STATUS:
945 		return zcrypt_ica_status(filp, arg);
946 	case Z90STAT_TOTALCOUNT:
947 		return put_user(zcrypt_device_count, (int __user *) arg);
948 	case Z90STAT_PCICACOUNT:
949 		return put_user(zcrypt_count_type(ZCRYPT_PCICA),
950 				(int __user *) arg);
951 	case Z90STAT_PCICCCOUNT:
952 		return put_user(zcrypt_count_type(ZCRYPT_PCICC),
953 				(int __user *) arg);
954 	case Z90STAT_PCIXCCMCL2COUNT:
955 		return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2),
956 				(int __user *) arg);
957 	case Z90STAT_PCIXCCMCL3COUNT:
958 		return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
959 				(int __user *) arg);
960 	case Z90STAT_PCIXCCCOUNT:
961 		return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2) +
962 				zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
963 				(int __user *) arg);
964 	case Z90STAT_CEX2CCOUNT:
965 		return put_user(zcrypt_count_type(ZCRYPT_CEX2C),
966 				(int __user *) arg);
967 	case Z90STAT_CEX2ACOUNT:
968 		return put_user(zcrypt_count_type(ZCRYPT_CEX2A),
969 				(int __user *) arg);
970 	default:
971 		/* unknown ioctl number */
972 		return -ENOIOCTLCMD;
973 	}
974 }
975 
976 #ifdef CONFIG_COMPAT
977 /*
978  * ioctl32 conversion routines
979  */
980 struct compat_ica_rsa_modexpo {
981 	compat_uptr_t	inputdata;
982 	unsigned int	inputdatalength;
983 	compat_uptr_t	outputdata;
984 	unsigned int	outputdatalength;
985 	compat_uptr_t	b_key;
986 	compat_uptr_t	n_modulus;
987 };
988 
989 static long trans_modexpo32(struct file *filp, unsigned int cmd,
990 			    unsigned long arg)
991 {
992 	struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg);
993 	struct compat_ica_rsa_modexpo mex32;
994 	struct ica_rsa_modexpo mex64;
995 	long rc;
996 
997 	if (copy_from_user(&mex32, umex32, sizeof(mex32)))
998 		return -EFAULT;
999 	mex64.inputdata = compat_ptr(mex32.inputdata);
1000 	mex64.inputdatalength = mex32.inputdatalength;
1001 	mex64.outputdata = compat_ptr(mex32.outputdata);
1002 	mex64.outputdatalength = mex32.outputdatalength;
1003 	mex64.b_key = compat_ptr(mex32.b_key);
1004 	mex64.n_modulus = compat_ptr(mex32.n_modulus);
1005 	do {
1006 		rc = zcrypt_rsa_modexpo(&mex64);
1007 	} while (rc == -EAGAIN);
1008 	/* on failure: retry once again after a requested rescan */
1009 	if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1010 		do {
1011 			rc = zcrypt_rsa_modexpo(&mex64);
1012 		} while (rc == -EAGAIN);
1013 	if (rc)
1014 		return rc;
1015 	return put_user(mex64.outputdatalength,
1016 			&umex32->outputdatalength);
1017 }
1018 
1019 struct compat_ica_rsa_modexpo_crt {
1020 	compat_uptr_t	inputdata;
1021 	unsigned int	inputdatalength;
1022 	compat_uptr_t	outputdata;
1023 	unsigned int	outputdatalength;
1024 	compat_uptr_t	bp_key;
1025 	compat_uptr_t	bq_key;
1026 	compat_uptr_t	np_prime;
1027 	compat_uptr_t	nq_prime;
1028 	compat_uptr_t	u_mult_inv;
1029 };
1030 
1031 static long trans_modexpo_crt32(struct file *filp, unsigned int cmd,
1032 				unsigned long arg)
1033 {
1034 	struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg);
1035 	struct compat_ica_rsa_modexpo_crt crt32;
1036 	struct ica_rsa_modexpo_crt crt64;
1037 	long rc;
1038 
1039 	if (copy_from_user(&crt32, ucrt32, sizeof(crt32)))
1040 		return -EFAULT;
1041 	crt64.inputdata = compat_ptr(crt32.inputdata);
1042 	crt64.inputdatalength = crt32.inputdatalength;
1043 	crt64.outputdata=  compat_ptr(crt32.outputdata);
1044 	crt64.outputdatalength = crt32.outputdatalength;
1045 	crt64.bp_key = compat_ptr(crt32.bp_key);
1046 	crt64.bq_key = compat_ptr(crt32.bq_key);
1047 	crt64.np_prime = compat_ptr(crt32.np_prime);
1048 	crt64.nq_prime = compat_ptr(crt32.nq_prime);
1049 	crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv);
1050 	do {
1051 		rc = zcrypt_rsa_crt(&crt64);
1052 	} while (rc == -EAGAIN);
1053 	/* on failure: retry once again after a requested rescan */
1054 	if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1055 		do {
1056 			rc = zcrypt_rsa_crt(&crt64);
1057 		} while (rc == -EAGAIN);
1058 	if (rc)
1059 		return rc;
1060 	return put_user(crt64.outputdatalength,
1061 			&ucrt32->outputdatalength);
1062 }
1063 
1064 struct compat_ica_xcRB {
1065 	unsigned short	agent_ID;
1066 	unsigned int	user_defined;
1067 	unsigned short	request_ID;
1068 	unsigned int	request_control_blk_length;
1069 	unsigned char	padding1[16 - sizeof (compat_uptr_t)];
1070 	compat_uptr_t	request_control_blk_addr;
1071 	unsigned int	request_data_length;
1072 	char		padding2[16 - sizeof (compat_uptr_t)];
1073 	compat_uptr_t	request_data_address;
1074 	unsigned int	reply_control_blk_length;
1075 	char		padding3[16 - sizeof (compat_uptr_t)];
1076 	compat_uptr_t	reply_control_blk_addr;
1077 	unsigned int	reply_data_length;
1078 	char		padding4[16 - sizeof (compat_uptr_t)];
1079 	compat_uptr_t	reply_data_addr;
1080 	unsigned short	priority_window;
1081 	unsigned int	status;
1082 } __attribute__((packed));
1083 
1084 static long trans_xcRB32(struct file *filp, unsigned int cmd,
1085 			 unsigned long arg)
1086 {
1087 	struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg);
1088 	struct compat_ica_xcRB xcRB32;
1089 	struct ica_xcRB xcRB64;
1090 	long rc;
1091 
1092 	if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32)))
1093 		return -EFAULT;
1094 	xcRB64.agent_ID = xcRB32.agent_ID;
1095 	xcRB64.user_defined = xcRB32.user_defined;
1096 	xcRB64.request_ID = xcRB32.request_ID;
1097 	xcRB64.request_control_blk_length =
1098 		xcRB32.request_control_blk_length;
1099 	xcRB64.request_control_blk_addr =
1100 		compat_ptr(xcRB32.request_control_blk_addr);
1101 	xcRB64.request_data_length =
1102 		xcRB32.request_data_length;
1103 	xcRB64.request_data_address =
1104 		compat_ptr(xcRB32.request_data_address);
1105 	xcRB64.reply_control_blk_length =
1106 		xcRB32.reply_control_blk_length;
1107 	xcRB64.reply_control_blk_addr =
1108 		compat_ptr(xcRB32.reply_control_blk_addr);
1109 	xcRB64.reply_data_length = xcRB32.reply_data_length;
1110 	xcRB64.reply_data_addr =
1111 		compat_ptr(xcRB32.reply_data_addr);
1112 	xcRB64.priority_window = xcRB32.priority_window;
1113 	xcRB64.status = xcRB32.status;
1114 	do {
1115 		rc = zcrypt_send_cprb(&xcRB64);
1116 	} while (rc == -EAGAIN);
1117 	/* on failure: retry once again after a requested rescan */
1118 	if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1119 		do {
1120 			rc = zcrypt_send_cprb(&xcRB64);
1121 		} while (rc == -EAGAIN);
1122 	xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length;
1123 	xcRB32.reply_data_length = xcRB64.reply_data_length;
1124 	xcRB32.status = xcRB64.status;
1125 	if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32)))
1126 			return -EFAULT;
1127 	return rc;
1128 }
1129 
1130 static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd,
1131 			 unsigned long arg)
1132 {
1133 	if (cmd == ICARSAMODEXPO)
1134 		return trans_modexpo32(filp, cmd, arg);
1135 	if (cmd == ICARSACRT)
1136 		return trans_modexpo_crt32(filp, cmd, arg);
1137 	if (cmd == ZSECSENDCPRB)
1138 		return trans_xcRB32(filp, cmd, arg);
1139 	return zcrypt_unlocked_ioctl(filp, cmd, arg);
1140 }
1141 #endif
1142 
1143 /*
1144  * Misc device file operations.
1145  */
1146 static const struct file_operations zcrypt_fops = {
1147 	.owner		= THIS_MODULE,
1148 	.read		= zcrypt_read,
1149 	.write		= zcrypt_write,
1150 	.unlocked_ioctl	= zcrypt_unlocked_ioctl,
1151 #ifdef CONFIG_COMPAT
1152 	.compat_ioctl	= zcrypt_compat_ioctl,
1153 #endif
1154 	.open		= zcrypt_open,
1155 	.release	= zcrypt_release,
1156 	.llseek		= no_llseek,
1157 };
1158 
1159 /*
1160  * Misc device.
1161  */
1162 static struct miscdevice zcrypt_misc_device = {
1163 	.minor	    = MISC_DYNAMIC_MINOR,
1164 	.name	    = "z90crypt",
1165 	.fops	    = &zcrypt_fops,
1166 };
1167 
1168 /*
1169  * Deprecated /proc entry support.
1170  */
1171 static struct proc_dir_entry *zcrypt_entry;
1172 
1173 static void sprintcl(struct seq_file *m, unsigned char *addr, unsigned int len)
1174 {
1175 	int i;
1176 
1177 	for (i = 0; i < len; i++)
1178 		seq_printf(m, "%01x", (unsigned int) addr[i]);
1179 	seq_putc(m, ' ');
1180 }
1181 
1182 static void sprintrw(struct seq_file *m, unsigned char *addr, unsigned int len)
1183 {
1184 	int inl, c, cx;
1185 
1186 	seq_printf(m, "	   ");
1187 	inl = 0;
1188 	for (c = 0; c < (len / 16); c++) {
1189 		sprintcl(m, addr+inl, 16);
1190 		inl += 16;
1191 	}
1192 	cx = len%16;
1193 	if (cx) {
1194 		sprintcl(m, addr+inl, cx);
1195 		inl += cx;
1196 	}
1197 	seq_putc(m, '\n');
1198 }
1199 
1200 static void sprinthx(unsigned char *title, struct seq_file *m,
1201 		     unsigned char *addr, unsigned int len)
1202 {
1203 	int inl, r, rx;
1204 
1205 	seq_printf(m, "\n%s\n", title);
1206 	inl = 0;
1207 	for (r = 0; r < (len / 64); r++) {
1208 		sprintrw(m, addr+inl, 64);
1209 		inl += 64;
1210 	}
1211 	rx = len % 64;
1212 	if (rx) {
1213 		sprintrw(m, addr+inl, rx);
1214 		inl += rx;
1215 	}
1216 	seq_putc(m, '\n');
1217 }
1218 
1219 static void sprinthx4(unsigned char *title, struct seq_file *m,
1220 		      unsigned int *array, unsigned int len)
1221 {
1222 	seq_printf(m, "\n%s\n", title);
1223 	seq_hex_dump(m, "    ", DUMP_PREFIX_NONE, 32, 4, array, len, false);
1224 	seq_putc(m, '\n');
1225 }
1226 
1227 static int zcrypt_proc_show(struct seq_file *m, void *v)
1228 {
1229 	char workarea[sizeof(int) * AP_DEVICES];
1230 
1231 	seq_printf(m, "\nzcrypt version: %d.%d.%d\n",
1232 		   ZCRYPT_VERSION, ZCRYPT_RELEASE, ZCRYPT_VARIANT);
1233 	seq_printf(m, "Cryptographic domain: %d\n", ap_domain_index);
1234 	seq_printf(m, "Total device count: %d\n", zcrypt_device_count);
1235 	seq_printf(m, "PCICA count: %d\n", zcrypt_count_type(ZCRYPT_PCICA));
1236 	seq_printf(m, "PCICC count: %d\n", zcrypt_count_type(ZCRYPT_PCICC));
1237 	seq_printf(m, "PCIXCC MCL2 count: %d\n",
1238 		   zcrypt_count_type(ZCRYPT_PCIXCC_MCL2));
1239 	seq_printf(m, "PCIXCC MCL3 count: %d\n",
1240 		   zcrypt_count_type(ZCRYPT_PCIXCC_MCL3));
1241 	seq_printf(m, "CEX2C count: %d\n", zcrypt_count_type(ZCRYPT_CEX2C));
1242 	seq_printf(m, "CEX2A count: %d\n", zcrypt_count_type(ZCRYPT_CEX2A));
1243 	seq_printf(m, "CEX3C count: %d\n", zcrypt_count_type(ZCRYPT_CEX3C));
1244 	seq_printf(m, "CEX3A count: %d\n", zcrypt_count_type(ZCRYPT_CEX3A));
1245 	seq_printf(m, "requestq count: %d\n", zcrypt_requestq_count());
1246 	seq_printf(m, "pendingq count: %d\n", zcrypt_pendingq_count());
1247 	seq_printf(m, "Total open handles: %d\n\n",
1248 		   atomic_read(&zcrypt_open_count));
1249 	zcrypt_status_mask(workarea);
1250 	sprinthx("Online devices: 1=PCICA 2=PCICC 3=PCIXCC(MCL2) "
1251 		 "4=PCIXCC(MCL3) 5=CEX2C 6=CEX2A 7=CEX3C 8=CEX3A",
1252 		 m, workarea, AP_DEVICES);
1253 	zcrypt_qdepth_mask(workarea);
1254 	sprinthx("Waiting work element counts", m, workarea, AP_DEVICES);
1255 	zcrypt_perdev_reqcnt((int *) workarea);
1256 	sprinthx4("Per-device successfully completed request counts",
1257 		  m, (unsigned int *) workarea, AP_DEVICES);
1258 	return 0;
1259 }
1260 
1261 static int zcrypt_proc_open(struct inode *inode, struct file *file)
1262 {
1263 	return single_open(file, zcrypt_proc_show, NULL);
1264 }
1265 
1266 static void zcrypt_disable_card(int index)
1267 {
1268 	struct zcrypt_card *zc;
1269 	struct zcrypt_queue *zq;
1270 
1271 	spin_lock(&zcrypt_list_lock);
1272 	for_each_zcrypt_card(zc) {
1273 		for_each_zcrypt_queue(zq, zc) {
1274 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index)
1275 				continue;
1276 			zq->online = 0;
1277 			ap_flush_queue(zq->queue);
1278 		}
1279 	}
1280 	spin_unlock(&zcrypt_list_lock);
1281 }
1282 
1283 static void zcrypt_enable_card(int index)
1284 {
1285 	struct zcrypt_card *zc;
1286 	struct zcrypt_queue *zq;
1287 
1288 	spin_lock(&zcrypt_list_lock);
1289 	for_each_zcrypt_card(zc) {
1290 		for_each_zcrypt_queue(zq, zc) {
1291 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index)
1292 				continue;
1293 			zq->online = 1;
1294 			ap_flush_queue(zq->queue);
1295 		}
1296 	}
1297 	spin_unlock(&zcrypt_list_lock);
1298 }
1299 
1300 static ssize_t zcrypt_proc_write(struct file *file, const char __user *buffer,
1301 				 size_t count, loff_t *pos)
1302 {
1303 	unsigned char *lbuf, *ptr;
1304 	size_t local_count;
1305 	int j;
1306 
1307 	if (count <= 0)
1308 		return 0;
1309 
1310 #define LBUFSIZE 1200UL
1311 	lbuf = kmalloc(LBUFSIZE, GFP_KERNEL);
1312 	if (!lbuf)
1313 		return 0;
1314 
1315 	local_count = min(LBUFSIZE - 1, count);
1316 	if (copy_from_user(lbuf, buffer, local_count) != 0) {
1317 		kfree(lbuf);
1318 		return -EFAULT;
1319 	}
1320 	lbuf[local_count] = '\0';
1321 
1322 	ptr = strstr(lbuf, "Online devices");
1323 	if (!ptr)
1324 		goto out;
1325 	ptr = strstr(ptr, "\n");
1326 	if (!ptr)
1327 		goto out;
1328 	ptr++;
1329 
1330 	if (strstr(ptr, "Waiting work element counts") == NULL)
1331 		goto out;
1332 
1333 	for (j = 0; j < 64 && *ptr; ptr++) {
1334 		/*
1335 		 * '0' for no device, '1' for PCICA, '2' for PCICC,
1336 		 * '3' for PCIXCC_MCL2, '4' for PCIXCC_MCL3,
1337 		 * '5' for CEX2C and '6' for CEX2A'
1338 		 * '7' for CEX3C and '8' for CEX3A
1339 		 */
1340 		if (*ptr >= '0' && *ptr <= '8')
1341 			j++;
1342 		else if (*ptr == 'd' || *ptr == 'D')
1343 			zcrypt_disable_card(j++);
1344 		else if (*ptr == 'e' || *ptr == 'E')
1345 			zcrypt_enable_card(j++);
1346 		else if (*ptr != ' ' && *ptr != '\t')
1347 			break;
1348 	}
1349 out:
1350 	kfree(lbuf);
1351 	return count;
1352 }
1353 
1354 static const struct file_operations zcrypt_proc_fops = {
1355 	.owner		= THIS_MODULE,
1356 	.open		= zcrypt_proc_open,
1357 	.read		= seq_read,
1358 	.llseek		= seq_lseek,
1359 	.release	= single_release,
1360 	.write		= zcrypt_proc_write,
1361 };
1362 
1363 static int zcrypt_rng_device_count;
1364 static u32 *zcrypt_rng_buffer;
1365 static int zcrypt_rng_buffer_index;
1366 static DEFINE_MUTEX(zcrypt_rng_mutex);
1367 
1368 static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
1369 {
1370 	int rc;
1371 
1372 	/*
1373 	 * We don't need locking here because the RNG API guarantees serialized
1374 	 * read method calls.
1375 	 */
1376 	if (zcrypt_rng_buffer_index == 0) {
1377 		rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1378 		/* on failure: retry once again after a requested rescan */
1379 		if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1380 			rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1381 		if (rc < 0)
1382 			return -EIO;
1383 		zcrypt_rng_buffer_index = rc / sizeof *data;
1384 	}
1385 	*data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index];
1386 	return sizeof *data;
1387 }
1388 
1389 static struct hwrng zcrypt_rng_dev = {
1390 	.name		= "zcrypt",
1391 	.data_read	= zcrypt_rng_data_read,
1392 	.quality	= 990,
1393 };
1394 
1395 int zcrypt_rng_device_add(void)
1396 {
1397 	int rc = 0;
1398 
1399 	mutex_lock(&zcrypt_rng_mutex);
1400 	if (zcrypt_rng_device_count == 0) {
1401 		zcrypt_rng_buffer = (u32 *) get_zeroed_page(GFP_KERNEL);
1402 		if (!zcrypt_rng_buffer) {
1403 			rc = -ENOMEM;
1404 			goto out;
1405 		}
1406 		zcrypt_rng_buffer_index = 0;
1407 		if (!zcrypt_hwrng_seed)
1408 			zcrypt_rng_dev.quality = 0;
1409 		rc = hwrng_register(&zcrypt_rng_dev);
1410 		if (rc)
1411 			goto out_free;
1412 		zcrypt_rng_device_count = 1;
1413 	} else
1414 		zcrypt_rng_device_count++;
1415 	mutex_unlock(&zcrypt_rng_mutex);
1416 	return 0;
1417 
1418 out_free:
1419 	free_page((unsigned long) zcrypt_rng_buffer);
1420 out:
1421 	mutex_unlock(&zcrypt_rng_mutex);
1422 	return rc;
1423 }
1424 
1425 void zcrypt_rng_device_remove(void)
1426 {
1427 	mutex_lock(&zcrypt_rng_mutex);
1428 	zcrypt_rng_device_count--;
1429 	if (zcrypt_rng_device_count == 0) {
1430 		hwrng_unregister(&zcrypt_rng_dev);
1431 		free_page((unsigned long) zcrypt_rng_buffer);
1432 	}
1433 	mutex_unlock(&zcrypt_rng_mutex);
1434 }
1435 
1436 int __init zcrypt_debug_init(void)
1437 {
1438 	zcrypt_dbf_info = debug_register("zcrypt", 1, 1,
1439 					 DBF_MAX_SPRINTF_ARGS * sizeof(long));
1440 	debug_register_view(zcrypt_dbf_info, &debug_sprintf_view);
1441 	debug_set_level(zcrypt_dbf_info, DBF_ERR);
1442 
1443 	return 0;
1444 }
1445 
1446 void zcrypt_debug_exit(void)
1447 {
1448 	debug_unregister(zcrypt_dbf_info);
1449 }
1450 
1451 /**
1452  * zcrypt_api_init(): Module initialization.
1453  *
1454  * The module initialization code.
1455  */
1456 int __init zcrypt_api_init(void)
1457 {
1458 	int rc;
1459 
1460 	rc = zcrypt_debug_init();
1461 	if (rc)
1462 		goto out;
1463 
1464 	atomic_set(&zcrypt_rescan_req, 0);
1465 
1466 	/* Register the request sprayer. */
1467 	rc = misc_register(&zcrypt_misc_device);
1468 	if (rc < 0)
1469 		goto out;
1470 
1471 	/* Set up the proc file system */
1472 	zcrypt_entry = proc_create("driver/z90crypt", 0644, NULL,
1473 				   &zcrypt_proc_fops);
1474 	if (!zcrypt_entry) {
1475 		rc = -ENOMEM;
1476 		goto out_misc;
1477 	}
1478 
1479 	zcrypt_msgtype6_init();
1480 	zcrypt_msgtype50_init();
1481 	return 0;
1482 
1483 out_misc:
1484 	misc_deregister(&zcrypt_misc_device);
1485 out:
1486 	return rc;
1487 }
1488 
1489 /**
1490  * zcrypt_api_exit(): Module termination.
1491  *
1492  * The module termination code.
1493  */
1494 void __exit zcrypt_api_exit(void)
1495 {
1496 	remove_proc_entry("driver/z90crypt", NULL);
1497 	misc_deregister(&zcrypt_misc_device);
1498 	zcrypt_msgtype6_exit();
1499 	zcrypt_msgtype50_exit();
1500 	zcrypt_debug_exit();
1501 }
1502 
1503 module_init(zcrypt_api_init);
1504 module_exit(zcrypt_api_exit);
1505