xref: /linux/drivers/s390/crypto/zcrypt_api.c (revision 3a39d672e7f48b8d6b91a09afa4b55352773b4b5)
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 #define KMSG_COMPONENT "zcrypt"
16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17 
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/interrupt.h>
21 #include <linux/miscdevice.h>
22 #include <linux/fs.h>
23 #include <linux/compat.h>
24 #include <linux/slab.h>
25 #include <linux/atomic.h>
26 #include <linux/uaccess.h>
27 #include <linux/hw_random.h>
28 #include <linux/debugfs.h>
29 #include <linux/cdev.h>
30 #include <linux/ctype.h>
31 #include <linux/capability.h>
32 #include <asm/debug.h>
33 
34 #define CREATE_TRACE_POINTS
35 #include <asm/trace/zcrypt.h>
36 
37 #include "zcrypt_api.h"
38 #include "zcrypt_debug.h"
39 
40 #include "zcrypt_msgtype6.h"
41 #include "zcrypt_msgtype50.h"
42 #include "zcrypt_ccamisc.h"
43 #include "zcrypt_ep11misc.h"
44 
45 /*
46  * Module description.
47  */
48 MODULE_AUTHOR("IBM Corporation");
49 MODULE_DESCRIPTION("Cryptographic Coprocessor interface, " \
50 		   "Copyright IBM Corp. 2001, 2012");
51 MODULE_LICENSE("GPL");
52 
53 /*
54  * zcrypt tracepoint functions
55  */
56 EXPORT_TRACEPOINT_SYMBOL(s390_zcrypt_req);
57 EXPORT_TRACEPOINT_SYMBOL(s390_zcrypt_rep);
58 
59 DEFINE_SPINLOCK(zcrypt_list_lock);
60 LIST_HEAD(zcrypt_card_list);
61 
62 static atomic_t zcrypt_open_count = ATOMIC_INIT(0);
63 
64 static LIST_HEAD(zcrypt_ops_list);
65 
66 /* Zcrypt related debug feature stuff. */
67 debug_info_t *zcrypt_dbf_info;
68 
69 /*
70  * Process a rescan of the transport layer.
71  * Runs a synchronous AP bus rescan.
72  * Returns true if something has changed (for example the
73  * bus scan has found and build up new devices) and it is
74  * worth to do a retry. Otherwise false is returned meaning
75  * no changes on the AP bus level.
76  */
zcrypt_process_rescan(void)77 static inline bool zcrypt_process_rescan(void)
78 {
79 	return ap_bus_force_rescan();
80 }
81 
zcrypt_msgtype_register(struct zcrypt_ops * zops)82 void zcrypt_msgtype_register(struct zcrypt_ops *zops)
83 {
84 	list_add_tail(&zops->list, &zcrypt_ops_list);
85 }
86 
zcrypt_msgtype_unregister(struct zcrypt_ops * zops)87 void zcrypt_msgtype_unregister(struct zcrypt_ops *zops)
88 {
89 	list_del_init(&zops->list);
90 }
91 
zcrypt_msgtype(unsigned char * name,int variant)92 struct zcrypt_ops *zcrypt_msgtype(unsigned char *name, int variant)
93 {
94 	struct zcrypt_ops *zops;
95 
96 	list_for_each_entry(zops, &zcrypt_ops_list, list)
97 		if (zops->variant == variant &&
98 		    (!strncmp(zops->name, name, sizeof(zops->name))))
99 			return zops;
100 	return NULL;
101 }
102 EXPORT_SYMBOL(zcrypt_msgtype);
103 
104 /*
105  * Multi device nodes extension functions.
106  */
107 
108 struct zcdn_device;
109 
110 static void zcdn_device_release(struct device *dev);
111 static const struct class zcrypt_class = {
112 	.name = ZCRYPT_NAME,
113 	.dev_release = zcdn_device_release,
114 };
115 static dev_t zcrypt_devt;
116 static struct cdev zcrypt_cdev;
117 
118 struct zcdn_device {
119 	struct device device;
120 	struct ap_perms perms;
121 };
122 
123 #define to_zcdn_dev(x) container_of((x), struct zcdn_device, device)
124 
125 #define ZCDN_MAX_NAME 32
126 
127 static int zcdn_create(const char *name);
128 static int zcdn_destroy(const char *name);
129 
130 /*
131  * Find zcdn device by name.
132  * Returns reference to the zcdn device which needs to be released
133  * with put_device() after use.
134  */
find_zcdndev_by_name(const char * name)135 static inline struct zcdn_device *find_zcdndev_by_name(const char *name)
136 {
137 	struct device *dev = class_find_device_by_name(&zcrypt_class, name);
138 
139 	return dev ? to_zcdn_dev(dev) : NULL;
140 }
141 
142 /*
143  * Find zcdn device by devt value.
144  * Returns reference to the zcdn device which needs to be released
145  * with put_device() after use.
146  */
find_zcdndev_by_devt(dev_t devt)147 static inline struct zcdn_device *find_zcdndev_by_devt(dev_t devt)
148 {
149 	struct device *dev = class_find_device_by_devt(&zcrypt_class, devt);
150 
151 	return dev ? to_zcdn_dev(dev) : NULL;
152 }
153 
ioctlmask_show(struct device * dev,struct device_attribute * attr,char * buf)154 static ssize_t ioctlmask_show(struct device *dev,
155 			      struct device_attribute *attr,
156 			      char *buf)
157 {
158 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
159 	int i, n;
160 
161 	if (mutex_lock_interruptible(&ap_perms_mutex))
162 		return -ERESTARTSYS;
163 
164 	n = sysfs_emit(buf, "0x");
165 	for (i = 0; i < sizeof(zcdndev->perms.ioctlm) / sizeof(long); i++)
166 		n += sysfs_emit_at(buf, n, "%016lx", zcdndev->perms.ioctlm[i]);
167 	n += sysfs_emit_at(buf, n, "\n");
168 
169 	mutex_unlock(&ap_perms_mutex);
170 
171 	return n;
172 }
173 
ioctlmask_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)174 static ssize_t ioctlmask_store(struct device *dev,
175 			       struct device_attribute *attr,
176 			       const char *buf, size_t count)
177 {
178 	int rc;
179 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
180 
181 	rc = ap_parse_mask_str(buf, zcdndev->perms.ioctlm,
182 			       AP_IOCTLS, &ap_perms_mutex);
183 	if (rc)
184 		return rc;
185 
186 	return count;
187 }
188 
189 static DEVICE_ATTR_RW(ioctlmask);
190 
apmask_show(struct device * dev,struct device_attribute * attr,char * buf)191 static ssize_t apmask_show(struct device *dev,
192 			   struct device_attribute *attr,
193 			   char *buf)
194 {
195 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
196 	int i, n;
197 
198 	if (mutex_lock_interruptible(&ap_perms_mutex))
199 		return -ERESTARTSYS;
200 
201 	n = sysfs_emit(buf, "0x");
202 	for (i = 0; i < sizeof(zcdndev->perms.apm) / sizeof(long); i++)
203 		n += sysfs_emit_at(buf, n, "%016lx", zcdndev->perms.apm[i]);
204 	n += sysfs_emit_at(buf, n, "\n");
205 
206 	mutex_unlock(&ap_perms_mutex);
207 
208 	return n;
209 }
210 
apmask_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)211 static ssize_t apmask_store(struct device *dev,
212 			    struct device_attribute *attr,
213 			    const char *buf, size_t count)
214 {
215 	int rc;
216 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
217 
218 	rc = ap_parse_mask_str(buf, zcdndev->perms.apm,
219 			       AP_DEVICES, &ap_perms_mutex);
220 	if (rc)
221 		return rc;
222 
223 	return count;
224 }
225 
226 static DEVICE_ATTR_RW(apmask);
227 
aqmask_show(struct device * dev,struct device_attribute * attr,char * buf)228 static ssize_t aqmask_show(struct device *dev,
229 			   struct device_attribute *attr,
230 			   char *buf)
231 {
232 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
233 	int i, n;
234 
235 	if (mutex_lock_interruptible(&ap_perms_mutex))
236 		return -ERESTARTSYS;
237 
238 	n = sysfs_emit(buf, "0x");
239 	for (i = 0; i < sizeof(zcdndev->perms.aqm) / sizeof(long); i++)
240 		n += sysfs_emit_at(buf, n, "%016lx", zcdndev->perms.aqm[i]);
241 	n += sysfs_emit_at(buf, n, "\n");
242 
243 	mutex_unlock(&ap_perms_mutex);
244 
245 	return n;
246 }
247 
aqmask_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)248 static ssize_t aqmask_store(struct device *dev,
249 			    struct device_attribute *attr,
250 			    const char *buf, size_t count)
251 {
252 	int rc;
253 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
254 
255 	rc = ap_parse_mask_str(buf, zcdndev->perms.aqm,
256 			       AP_DOMAINS, &ap_perms_mutex);
257 	if (rc)
258 		return rc;
259 
260 	return count;
261 }
262 
263 static DEVICE_ATTR_RW(aqmask);
264 
admask_show(struct device * dev,struct device_attribute * attr,char * buf)265 static ssize_t admask_show(struct device *dev,
266 			   struct device_attribute *attr,
267 			   char *buf)
268 {
269 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
270 	int i, n;
271 
272 	if (mutex_lock_interruptible(&ap_perms_mutex))
273 		return -ERESTARTSYS;
274 
275 	n = sysfs_emit(buf, "0x");
276 	for (i = 0; i < sizeof(zcdndev->perms.adm) / sizeof(long); i++)
277 		n += sysfs_emit_at(buf, n, "%016lx", zcdndev->perms.adm[i]);
278 	n += sysfs_emit_at(buf, n, "\n");
279 
280 	mutex_unlock(&ap_perms_mutex);
281 
282 	return n;
283 }
284 
admask_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)285 static ssize_t admask_store(struct device *dev,
286 			    struct device_attribute *attr,
287 			    const char *buf, size_t count)
288 {
289 	int rc;
290 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
291 
292 	rc = ap_parse_mask_str(buf, zcdndev->perms.adm,
293 			       AP_DOMAINS, &ap_perms_mutex);
294 	if (rc)
295 		return rc;
296 
297 	return count;
298 }
299 
300 static DEVICE_ATTR_RW(admask);
301 
302 static struct attribute *zcdn_dev_attrs[] = {
303 	&dev_attr_ioctlmask.attr,
304 	&dev_attr_apmask.attr,
305 	&dev_attr_aqmask.attr,
306 	&dev_attr_admask.attr,
307 	NULL
308 };
309 
310 static struct attribute_group zcdn_dev_attr_group = {
311 	.attrs = zcdn_dev_attrs
312 };
313 
314 static const struct attribute_group *zcdn_dev_attr_groups[] = {
315 	&zcdn_dev_attr_group,
316 	NULL
317 };
318 
zcdn_create_store(const struct class * class,const struct class_attribute * attr,const char * buf,size_t count)319 static ssize_t zcdn_create_store(const struct class *class,
320 				 const struct class_attribute *attr,
321 				 const char *buf, size_t count)
322 {
323 	int rc;
324 	char name[ZCDN_MAX_NAME];
325 
326 	strscpy(name, skip_spaces(buf), sizeof(name));
327 
328 	rc = zcdn_create(strim(name));
329 
330 	return rc ? rc : count;
331 }
332 
333 static const struct class_attribute class_attr_zcdn_create =
334 	__ATTR(create, 0600, NULL, zcdn_create_store);
335 
zcdn_destroy_store(const struct class * class,const struct class_attribute * attr,const char * buf,size_t count)336 static ssize_t zcdn_destroy_store(const struct class *class,
337 				  const struct class_attribute *attr,
338 				  const char *buf, size_t count)
339 {
340 	int rc;
341 	char name[ZCDN_MAX_NAME];
342 
343 	strscpy(name, skip_spaces(buf), sizeof(name));
344 
345 	rc = zcdn_destroy(strim(name));
346 
347 	return rc ? rc : count;
348 }
349 
350 static const struct class_attribute class_attr_zcdn_destroy =
351 	__ATTR(destroy, 0600, NULL, zcdn_destroy_store);
352 
zcdn_device_release(struct device * dev)353 static void zcdn_device_release(struct device *dev)
354 {
355 	struct zcdn_device *zcdndev = to_zcdn_dev(dev);
356 
357 	ZCRYPT_DBF_INFO("%s releasing zcdn device %d:%d\n",
358 			__func__, MAJOR(dev->devt), MINOR(dev->devt));
359 
360 	kfree(zcdndev);
361 }
362 
zcdn_create(const char * name)363 static int zcdn_create(const char *name)
364 {
365 	dev_t devt;
366 	int i, rc = 0;
367 	struct zcdn_device *zcdndev;
368 
369 	if (mutex_lock_interruptible(&ap_perms_mutex))
370 		return -ERESTARTSYS;
371 
372 	/* check if device node with this name already exists */
373 	if (name[0]) {
374 		zcdndev = find_zcdndev_by_name(name);
375 		if (zcdndev) {
376 			put_device(&zcdndev->device);
377 			rc = -EEXIST;
378 			goto unlockout;
379 		}
380 	}
381 
382 	/* find an unused minor number */
383 	for (i = 0; i < ZCRYPT_MAX_MINOR_NODES; i++) {
384 		devt = MKDEV(MAJOR(zcrypt_devt), MINOR(zcrypt_devt) + i);
385 		zcdndev = find_zcdndev_by_devt(devt);
386 		if (zcdndev)
387 			put_device(&zcdndev->device);
388 		else
389 			break;
390 	}
391 	if (i == ZCRYPT_MAX_MINOR_NODES) {
392 		rc = -ENOSPC;
393 		goto unlockout;
394 	}
395 
396 	/* alloc and prepare a new zcdn device */
397 	zcdndev = kzalloc(sizeof(*zcdndev), GFP_KERNEL);
398 	if (!zcdndev) {
399 		rc = -ENOMEM;
400 		goto unlockout;
401 	}
402 	zcdndev->device.release = zcdn_device_release;
403 	zcdndev->device.class = &zcrypt_class;
404 	zcdndev->device.devt = devt;
405 	zcdndev->device.groups = zcdn_dev_attr_groups;
406 	if (name[0])
407 		rc = dev_set_name(&zcdndev->device, "%s", name);
408 	else
409 		rc = dev_set_name(&zcdndev->device, ZCRYPT_NAME "_%d", (int)MINOR(devt));
410 	if (rc) {
411 		kfree(zcdndev);
412 		goto unlockout;
413 	}
414 	rc = device_register(&zcdndev->device);
415 	if (rc) {
416 		put_device(&zcdndev->device);
417 		goto unlockout;
418 	}
419 
420 	ZCRYPT_DBF_INFO("%s created zcdn device %d:%d\n",
421 			__func__, MAJOR(devt), MINOR(devt));
422 
423 unlockout:
424 	mutex_unlock(&ap_perms_mutex);
425 	return rc;
426 }
427 
zcdn_destroy(const char * name)428 static int zcdn_destroy(const char *name)
429 {
430 	int rc = 0;
431 	struct zcdn_device *zcdndev;
432 
433 	if (mutex_lock_interruptible(&ap_perms_mutex))
434 		return -ERESTARTSYS;
435 
436 	/* try to find this zcdn device */
437 	zcdndev = find_zcdndev_by_name(name);
438 	if (!zcdndev) {
439 		rc = -ENOENT;
440 		goto unlockout;
441 	}
442 
443 	/*
444 	 * The zcdn device is not hard destroyed. It is subject to
445 	 * reference counting and thus just needs to be unregistered.
446 	 */
447 	put_device(&zcdndev->device);
448 	device_unregister(&zcdndev->device);
449 
450 unlockout:
451 	mutex_unlock(&ap_perms_mutex);
452 	return rc;
453 }
454 
zcdn_destroy_all(void)455 static void zcdn_destroy_all(void)
456 {
457 	int i;
458 	dev_t devt;
459 	struct zcdn_device *zcdndev;
460 
461 	mutex_lock(&ap_perms_mutex);
462 	for (i = 0; i < ZCRYPT_MAX_MINOR_NODES; i++) {
463 		devt = MKDEV(MAJOR(zcrypt_devt), MINOR(zcrypt_devt) + i);
464 		zcdndev = find_zcdndev_by_devt(devt);
465 		if (zcdndev) {
466 			put_device(&zcdndev->device);
467 			device_unregister(&zcdndev->device);
468 		}
469 	}
470 	mutex_unlock(&ap_perms_mutex);
471 }
472 
473 /*
474  * zcrypt_read (): Not supported beyond zcrypt 1.3.1.
475  *
476  * This function is not supported beyond zcrypt 1.3.1.
477  */
zcrypt_read(struct file * filp,char __user * buf,size_t count,loff_t * f_pos)478 static ssize_t zcrypt_read(struct file *filp, char __user *buf,
479 			   size_t count, loff_t *f_pos)
480 {
481 	return -EPERM;
482 }
483 
484 /*
485  * zcrypt_write(): Not allowed.
486  *
487  * Write is not allowed
488  */
zcrypt_write(struct file * filp,const char __user * buf,size_t count,loff_t * f_pos)489 static ssize_t zcrypt_write(struct file *filp, const char __user *buf,
490 			    size_t count, loff_t *f_pos)
491 {
492 	return -EPERM;
493 }
494 
495 /*
496  * zcrypt_open(): Count number of users.
497  *
498  * Device open function to count number of users.
499  */
zcrypt_open(struct inode * inode,struct file * filp)500 static int zcrypt_open(struct inode *inode, struct file *filp)
501 {
502 	struct ap_perms *perms = &ap_perms;
503 
504 	if (filp->f_inode->i_cdev == &zcrypt_cdev) {
505 		struct zcdn_device *zcdndev;
506 
507 		if (mutex_lock_interruptible(&ap_perms_mutex))
508 			return -ERESTARTSYS;
509 		zcdndev = find_zcdndev_by_devt(filp->f_inode->i_rdev);
510 		/* find returns a reference, no get_device() needed */
511 		mutex_unlock(&ap_perms_mutex);
512 		if (zcdndev)
513 			perms = &zcdndev->perms;
514 	}
515 	filp->private_data = (void *)perms;
516 
517 	atomic_inc(&zcrypt_open_count);
518 	return stream_open(inode, filp);
519 }
520 
521 /*
522  * zcrypt_release(): Count number of users.
523  *
524  * Device close function to count number of users.
525  */
zcrypt_release(struct inode * inode,struct file * filp)526 static int zcrypt_release(struct inode *inode, struct file *filp)
527 {
528 	if (filp->f_inode->i_cdev == &zcrypt_cdev) {
529 		struct zcdn_device *zcdndev;
530 
531 		mutex_lock(&ap_perms_mutex);
532 		zcdndev = find_zcdndev_by_devt(filp->f_inode->i_rdev);
533 		mutex_unlock(&ap_perms_mutex);
534 		if (zcdndev) {
535 			/* 2 puts here: one for find, one for open */
536 			put_device(&zcdndev->device);
537 			put_device(&zcdndev->device);
538 		}
539 	}
540 
541 	atomic_dec(&zcrypt_open_count);
542 	return 0;
543 }
544 
zcrypt_check_ioctl(struct ap_perms * perms,unsigned int cmd)545 static inline int zcrypt_check_ioctl(struct ap_perms *perms,
546 				     unsigned int cmd)
547 {
548 	int rc = -EPERM;
549 	int ioctlnr = (cmd & _IOC_NRMASK) >> _IOC_NRSHIFT;
550 
551 	if (ioctlnr > 0 && ioctlnr < AP_IOCTLS) {
552 		if (test_bit_inv(ioctlnr, perms->ioctlm))
553 			rc = 0;
554 	}
555 
556 	if (rc)
557 		ZCRYPT_DBF_WARN("%s ioctl check failed: ioctlnr=0x%04x rc=%d\n",
558 				__func__, ioctlnr, rc);
559 
560 	return rc;
561 }
562 
zcrypt_check_card(struct ap_perms * perms,int card)563 static inline bool zcrypt_check_card(struct ap_perms *perms, int card)
564 {
565 	return test_bit_inv(card, perms->apm) ? true : false;
566 }
567 
zcrypt_check_queue(struct ap_perms * perms,int queue)568 static inline bool zcrypt_check_queue(struct ap_perms *perms, int queue)
569 {
570 	return test_bit_inv(queue, perms->aqm) ? true : false;
571 }
572 
zcrypt_pick_queue(struct zcrypt_card * zc,struct zcrypt_queue * zq,struct module ** pmod,unsigned int weight)573 static inline struct zcrypt_queue *zcrypt_pick_queue(struct zcrypt_card *zc,
574 						     struct zcrypt_queue *zq,
575 						     struct module **pmod,
576 						     unsigned int weight)
577 {
578 	if (!zq || !try_module_get(zq->queue->ap_dev.device.driver->owner))
579 		return NULL;
580 	zcrypt_card_get(zc);
581 	zcrypt_queue_get(zq);
582 	get_device(&zq->queue->ap_dev.device);
583 	atomic_add(weight, &zc->load);
584 	atomic_add(weight, &zq->load);
585 	zq->request_count++;
586 	*pmod = zq->queue->ap_dev.device.driver->owner;
587 	return zq;
588 }
589 
zcrypt_drop_queue(struct zcrypt_card * zc,struct zcrypt_queue * zq,struct module * mod,unsigned int weight)590 static inline void zcrypt_drop_queue(struct zcrypt_card *zc,
591 				     struct zcrypt_queue *zq,
592 				     struct module *mod,
593 				     unsigned int weight)
594 {
595 	zq->request_count--;
596 	atomic_sub(weight, &zc->load);
597 	atomic_sub(weight, &zq->load);
598 	put_device(&zq->queue->ap_dev.device);
599 	zcrypt_queue_put(zq);
600 	zcrypt_card_put(zc);
601 	module_put(mod);
602 }
603 
zcrypt_card_compare(struct zcrypt_card * zc,struct zcrypt_card * pref_zc,unsigned int weight,unsigned int pref_weight)604 static inline bool zcrypt_card_compare(struct zcrypt_card *zc,
605 				       struct zcrypt_card *pref_zc,
606 				       unsigned int weight,
607 				       unsigned int pref_weight)
608 {
609 	if (!pref_zc)
610 		return true;
611 	weight += atomic_read(&zc->load);
612 	pref_weight += atomic_read(&pref_zc->load);
613 	if (weight == pref_weight)
614 		return atomic64_read(&zc->card->total_request_count) <
615 			atomic64_read(&pref_zc->card->total_request_count);
616 	return weight < pref_weight;
617 }
618 
zcrypt_queue_compare(struct zcrypt_queue * zq,struct zcrypt_queue * pref_zq,unsigned int weight,unsigned int pref_weight)619 static inline bool zcrypt_queue_compare(struct zcrypt_queue *zq,
620 					struct zcrypt_queue *pref_zq,
621 					unsigned int weight,
622 					unsigned int pref_weight)
623 {
624 	if (!pref_zq)
625 		return true;
626 	weight += atomic_read(&zq->load);
627 	pref_weight += atomic_read(&pref_zq->load);
628 	if (weight == pref_weight)
629 		return zq->queue->total_request_count <
630 			pref_zq->queue->total_request_count;
631 	return weight < pref_weight;
632 }
633 
634 /*
635  * zcrypt ioctls.
636  */
zcrypt_rsa_modexpo(struct ap_perms * perms,struct zcrypt_track * tr,struct ica_rsa_modexpo * mex)637 static long zcrypt_rsa_modexpo(struct ap_perms *perms,
638 			       struct zcrypt_track *tr,
639 			       struct ica_rsa_modexpo *mex)
640 {
641 	struct zcrypt_card *zc, *pref_zc;
642 	struct zcrypt_queue *zq, *pref_zq;
643 	struct ap_message ap_msg;
644 	unsigned int wgt = 0, pref_wgt = 0;
645 	unsigned int func_code;
646 	int cpen, qpen, qid = 0, rc = -ENODEV;
647 	struct module *mod;
648 
649 	trace_s390_zcrypt_req(mex, TP_ICARSAMODEXPO);
650 
651 	ap_init_message(&ap_msg);
652 
653 	if (mex->outputdatalength < mex->inputdatalength) {
654 		func_code = 0;
655 		rc = -EINVAL;
656 		goto out;
657 	}
658 
659 	/*
660 	 * As long as outputdatalength is big enough, we can set the
661 	 * outputdatalength equal to the inputdatalength, since that is the
662 	 * number of bytes we will copy in any case
663 	 */
664 	mex->outputdatalength = mex->inputdatalength;
665 
666 	rc = get_rsa_modex_fc(mex, &func_code);
667 	if (rc)
668 		goto out;
669 
670 	pref_zc = NULL;
671 	pref_zq = NULL;
672 	spin_lock(&zcrypt_list_lock);
673 	for_each_zcrypt_card(zc) {
674 		/* Check for usable accelerator or CCA card */
675 		if (!zc->online || !zc->card->config || zc->card->chkstop ||
676 		    !(zc->card->hwinfo.accel || zc->card->hwinfo.cca))
677 			continue;
678 		/* Check for size limits */
679 		if (zc->min_mod_size > mex->inputdatalength ||
680 		    zc->max_mod_size < mex->inputdatalength)
681 			continue;
682 		/* check if device node has admission for this card */
683 		if (!zcrypt_check_card(perms, zc->card->id))
684 			continue;
685 		/* get weight index of the card device	*/
686 		wgt = zc->speed_rating[func_code];
687 		/* penalty if this msg was previously sent via this card */
688 		cpen = (tr && tr->again_counter && tr->last_qid &&
689 			AP_QID_CARD(tr->last_qid) == zc->card->id) ?
690 			TRACK_AGAIN_CARD_WEIGHT_PENALTY : 0;
691 		if (!zcrypt_card_compare(zc, pref_zc, wgt + cpen, pref_wgt))
692 			continue;
693 		for_each_zcrypt_queue(zq, zc) {
694 			/* check if device is usable and eligible */
695 			if (!zq->online || !zq->ops->rsa_modexpo ||
696 			    !ap_queue_usable(zq->queue))
697 				continue;
698 			/* check if device node has admission for this queue */
699 			if (!zcrypt_check_queue(perms,
700 						AP_QID_QUEUE(zq->queue->qid)))
701 				continue;
702 			/* penalty if the msg was previously sent at this qid */
703 			qpen = (tr && tr->again_counter && tr->last_qid &&
704 				tr->last_qid == zq->queue->qid) ?
705 				TRACK_AGAIN_QUEUE_WEIGHT_PENALTY : 0;
706 			if (!zcrypt_queue_compare(zq, pref_zq,
707 						  wgt + cpen + qpen, pref_wgt))
708 				continue;
709 			pref_zc = zc;
710 			pref_zq = zq;
711 			pref_wgt = wgt + cpen + qpen;
712 		}
713 	}
714 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, wgt);
715 	spin_unlock(&zcrypt_list_lock);
716 
717 	if (!pref_zq) {
718 		pr_debug("no matching queue found => ENODEV\n");
719 		rc = -ENODEV;
720 		goto out;
721 	}
722 
723 	qid = pref_zq->queue->qid;
724 	rc = pref_zq->ops->rsa_modexpo(pref_zq, mex, &ap_msg);
725 
726 	spin_lock(&zcrypt_list_lock);
727 	zcrypt_drop_queue(pref_zc, pref_zq, mod, wgt);
728 	spin_unlock(&zcrypt_list_lock);
729 
730 out:
731 	ap_release_message(&ap_msg);
732 	if (tr) {
733 		tr->last_rc = rc;
734 		tr->last_qid = qid;
735 	}
736 	trace_s390_zcrypt_rep(mex, func_code, rc,
737 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
738 	return rc;
739 }
740 
zcrypt_rsa_crt(struct ap_perms * perms,struct zcrypt_track * tr,struct ica_rsa_modexpo_crt * crt)741 static long zcrypt_rsa_crt(struct ap_perms *perms,
742 			   struct zcrypt_track *tr,
743 			   struct ica_rsa_modexpo_crt *crt)
744 {
745 	struct zcrypt_card *zc, *pref_zc;
746 	struct zcrypt_queue *zq, *pref_zq;
747 	struct ap_message ap_msg;
748 	unsigned int wgt = 0, pref_wgt = 0;
749 	unsigned int func_code;
750 	int cpen, qpen, qid = 0, rc = -ENODEV;
751 	struct module *mod;
752 
753 	trace_s390_zcrypt_req(crt, TP_ICARSACRT);
754 
755 	ap_init_message(&ap_msg);
756 
757 	if (crt->outputdatalength < crt->inputdatalength) {
758 		func_code = 0;
759 		rc = -EINVAL;
760 		goto out;
761 	}
762 
763 	/*
764 	 * As long as outputdatalength is big enough, we can set the
765 	 * outputdatalength equal to the inputdatalength, since that is the
766 	 * number of bytes we will copy in any case
767 	 */
768 	crt->outputdatalength = crt->inputdatalength;
769 
770 	rc = get_rsa_crt_fc(crt, &func_code);
771 	if (rc)
772 		goto out;
773 
774 	pref_zc = NULL;
775 	pref_zq = NULL;
776 	spin_lock(&zcrypt_list_lock);
777 	for_each_zcrypt_card(zc) {
778 		/* Check for usable accelerator or CCA card */
779 		if (!zc->online || !zc->card->config || zc->card->chkstop ||
780 		    !(zc->card->hwinfo.accel || zc->card->hwinfo.cca))
781 			continue;
782 		/* Check for size limits */
783 		if (zc->min_mod_size > crt->inputdatalength ||
784 		    zc->max_mod_size < crt->inputdatalength)
785 			continue;
786 		/* check if device node has admission for this card */
787 		if (!zcrypt_check_card(perms, zc->card->id))
788 			continue;
789 		/* get weight index of the card device	*/
790 		wgt = zc->speed_rating[func_code];
791 		/* penalty if this msg was previously sent via this card */
792 		cpen = (tr && tr->again_counter && tr->last_qid &&
793 			AP_QID_CARD(tr->last_qid) == zc->card->id) ?
794 			TRACK_AGAIN_CARD_WEIGHT_PENALTY : 0;
795 		if (!zcrypt_card_compare(zc, pref_zc, wgt + cpen, pref_wgt))
796 			continue;
797 		for_each_zcrypt_queue(zq, zc) {
798 			/* check if device is usable and eligible */
799 			if (!zq->online || !zq->ops->rsa_modexpo_crt ||
800 			    !ap_queue_usable(zq->queue))
801 				continue;
802 			/* check if device node has admission for this queue */
803 			if (!zcrypt_check_queue(perms,
804 						AP_QID_QUEUE(zq->queue->qid)))
805 				continue;
806 			/* penalty if the msg was previously sent at this qid */
807 			qpen = (tr && tr->again_counter && tr->last_qid &&
808 				tr->last_qid == zq->queue->qid) ?
809 				TRACK_AGAIN_QUEUE_WEIGHT_PENALTY : 0;
810 			if (!zcrypt_queue_compare(zq, pref_zq,
811 						  wgt + cpen + qpen, pref_wgt))
812 				continue;
813 			pref_zc = zc;
814 			pref_zq = zq;
815 			pref_wgt = wgt + cpen + qpen;
816 		}
817 	}
818 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, wgt);
819 	spin_unlock(&zcrypt_list_lock);
820 
821 	if (!pref_zq) {
822 		pr_debug("no matching queue found => ENODEV\n");
823 		rc = -ENODEV;
824 		goto out;
825 	}
826 
827 	qid = pref_zq->queue->qid;
828 	rc = pref_zq->ops->rsa_modexpo_crt(pref_zq, crt, &ap_msg);
829 
830 	spin_lock(&zcrypt_list_lock);
831 	zcrypt_drop_queue(pref_zc, pref_zq, mod, wgt);
832 	spin_unlock(&zcrypt_list_lock);
833 
834 out:
835 	ap_release_message(&ap_msg);
836 	if (tr) {
837 		tr->last_rc = rc;
838 		tr->last_qid = qid;
839 	}
840 	trace_s390_zcrypt_rep(crt, func_code, rc,
841 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
842 	return rc;
843 }
844 
_zcrypt_send_cprb(bool userspace,struct ap_perms * perms,struct zcrypt_track * tr,struct ica_xcRB * xcrb)845 static long _zcrypt_send_cprb(bool userspace, struct ap_perms *perms,
846 			      struct zcrypt_track *tr,
847 			      struct ica_xcRB *xcrb)
848 {
849 	struct zcrypt_card *zc, *pref_zc;
850 	struct zcrypt_queue *zq, *pref_zq;
851 	struct ap_message ap_msg;
852 	unsigned int wgt = 0, pref_wgt = 0;
853 	unsigned int func_code;
854 	unsigned short *domain, tdom;
855 	int cpen, qpen, qid = 0, rc = -ENODEV;
856 	struct module *mod;
857 
858 	trace_s390_zcrypt_req(xcrb, TB_ZSECSENDCPRB);
859 
860 	xcrb->status = 0;
861 	ap_init_message(&ap_msg);
862 
863 	rc = prep_cca_ap_msg(userspace, xcrb, &ap_msg, &func_code, &domain);
864 	if (rc)
865 		goto out;
866 	print_hex_dump_debug("ccareq: ", DUMP_PREFIX_ADDRESS, 16, 1,
867 			     ap_msg.msg, ap_msg.len, false);
868 
869 	tdom = *domain;
870 	if (perms != &ap_perms && tdom < AP_DOMAINS) {
871 		if (ap_msg.flags & AP_MSG_FLAG_ADMIN) {
872 			if (!test_bit_inv(tdom, perms->adm)) {
873 				rc = -ENODEV;
874 				goto out;
875 			}
876 		} else if ((ap_msg.flags & AP_MSG_FLAG_USAGE) == 0) {
877 			rc = -EOPNOTSUPP;
878 			goto out;
879 		}
880 	}
881 	/*
882 	 * If a valid target domain is set and this domain is NOT a usage
883 	 * domain but a control only domain, autoselect target domain.
884 	 */
885 	if (tdom < AP_DOMAINS &&
886 	    !ap_test_config_usage_domain(tdom) &&
887 	    ap_test_config_ctrl_domain(tdom))
888 		tdom = AUTOSEL_DOM;
889 
890 	pref_zc = NULL;
891 	pref_zq = NULL;
892 	spin_lock(&zcrypt_list_lock);
893 	for_each_zcrypt_card(zc) {
894 		/* Check for usable CCA card */
895 		if (!zc->online || !zc->card->config || zc->card->chkstop ||
896 		    !zc->card->hwinfo.cca)
897 			continue;
898 		/* Check for user selected CCA card */
899 		if (xcrb->user_defined != AUTOSELECT &&
900 		    xcrb->user_defined != zc->card->id)
901 			continue;
902 		/* check if request size exceeds card max msg size */
903 		if (ap_msg.len > zc->card->maxmsgsize)
904 			continue;
905 		/* check if device node has admission for this card */
906 		if (!zcrypt_check_card(perms, zc->card->id))
907 			continue;
908 		/* get weight index of the card device	*/
909 		wgt = speed_idx_cca(func_code) * zc->speed_rating[SECKEY];
910 		/* penalty if this msg was previously sent via this card */
911 		cpen = (tr && tr->again_counter && tr->last_qid &&
912 			AP_QID_CARD(tr->last_qid) == zc->card->id) ?
913 			TRACK_AGAIN_CARD_WEIGHT_PENALTY : 0;
914 		if (!zcrypt_card_compare(zc, pref_zc, wgt + cpen, pref_wgt))
915 			continue;
916 		for_each_zcrypt_queue(zq, zc) {
917 			/* check for device usable and eligible */
918 			if (!zq->online || !zq->ops->send_cprb ||
919 			    !ap_queue_usable(zq->queue) ||
920 			    (tdom != AUTOSEL_DOM &&
921 			     tdom != AP_QID_QUEUE(zq->queue->qid)))
922 				continue;
923 			/* check if device node has admission for this queue */
924 			if (!zcrypt_check_queue(perms,
925 						AP_QID_QUEUE(zq->queue->qid)))
926 				continue;
927 			/* penalty if the msg was previously sent at this qid */
928 			qpen = (tr && tr->again_counter && tr->last_qid &&
929 				tr->last_qid == zq->queue->qid) ?
930 				TRACK_AGAIN_QUEUE_WEIGHT_PENALTY : 0;
931 			if (!zcrypt_queue_compare(zq, pref_zq,
932 						  wgt + cpen + qpen, pref_wgt))
933 				continue;
934 			pref_zc = zc;
935 			pref_zq = zq;
936 			pref_wgt = wgt + cpen + qpen;
937 		}
938 	}
939 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, wgt);
940 	spin_unlock(&zcrypt_list_lock);
941 
942 	if (!pref_zq) {
943 		pr_debug("no match for address %02x.%04x => ENODEV\n",
944 			 xcrb->user_defined, *domain);
945 		rc = -ENODEV;
946 		goto out;
947 	}
948 
949 	/* in case of auto select, provide the correct domain */
950 	qid = pref_zq->queue->qid;
951 	if (*domain == AUTOSEL_DOM)
952 		*domain = AP_QID_QUEUE(qid);
953 
954 	rc = pref_zq->ops->send_cprb(userspace, pref_zq, xcrb, &ap_msg);
955 	if (!rc) {
956 		print_hex_dump_debug("ccarpl: ", DUMP_PREFIX_ADDRESS, 16, 1,
957 				     ap_msg.msg, ap_msg.len, false);
958 	}
959 
960 	spin_lock(&zcrypt_list_lock);
961 	zcrypt_drop_queue(pref_zc, pref_zq, mod, wgt);
962 	spin_unlock(&zcrypt_list_lock);
963 
964 out:
965 	ap_release_message(&ap_msg);
966 	if (tr) {
967 		tr->last_rc = rc;
968 		tr->last_qid = qid;
969 	}
970 	trace_s390_zcrypt_rep(xcrb, func_code, rc,
971 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
972 	return rc;
973 }
974 
zcrypt_send_cprb(struct ica_xcRB * xcrb)975 long zcrypt_send_cprb(struct ica_xcRB *xcrb)
976 {
977 	struct zcrypt_track tr;
978 	int rc;
979 
980 	memset(&tr, 0, sizeof(tr));
981 
982 	do {
983 		rc = _zcrypt_send_cprb(false, &ap_perms, &tr, xcrb);
984 	} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
985 
986 	/* on ENODEV failure: retry once again after a requested rescan */
987 	if (rc == -ENODEV && zcrypt_process_rescan())
988 		do {
989 			rc = _zcrypt_send_cprb(false, &ap_perms, &tr, xcrb);
990 		} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
991 	if (rc == -EAGAIN && tr.again_counter >= TRACK_AGAIN_MAX)
992 		rc = -EIO;
993 	if (rc)
994 		pr_debug("rc=%d\n", rc);
995 
996 	return rc;
997 }
998 EXPORT_SYMBOL(zcrypt_send_cprb);
999 
is_desired_ep11_card(unsigned int dev_id,unsigned short target_num,struct ep11_target_dev * targets)1000 static bool is_desired_ep11_card(unsigned int dev_id,
1001 				 unsigned short target_num,
1002 				 struct ep11_target_dev *targets)
1003 {
1004 	while (target_num-- > 0) {
1005 		if (targets->ap_id == dev_id || targets->ap_id == AUTOSEL_AP)
1006 			return true;
1007 		targets++;
1008 	}
1009 	return false;
1010 }
1011 
is_desired_ep11_queue(unsigned int dev_qid,unsigned short target_num,struct ep11_target_dev * targets)1012 static bool is_desired_ep11_queue(unsigned int dev_qid,
1013 				  unsigned short target_num,
1014 				  struct ep11_target_dev *targets)
1015 {
1016 	int card = AP_QID_CARD(dev_qid), dom = AP_QID_QUEUE(dev_qid);
1017 
1018 	while (target_num-- > 0) {
1019 		if ((targets->ap_id == card || targets->ap_id == AUTOSEL_AP) &&
1020 		    (targets->dom_id == dom || targets->dom_id == AUTOSEL_DOM))
1021 			return true;
1022 		targets++;
1023 	}
1024 	return false;
1025 }
1026 
_zcrypt_send_ep11_cprb(bool userspace,struct ap_perms * perms,struct zcrypt_track * tr,struct ep11_urb * xcrb)1027 static long _zcrypt_send_ep11_cprb(bool userspace, struct ap_perms *perms,
1028 				   struct zcrypt_track *tr,
1029 				   struct ep11_urb *xcrb)
1030 {
1031 	struct zcrypt_card *zc, *pref_zc;
1032 	struct zcrypt_queue *zq, *pref_zq;
1033 	struct ep11_target_dev *targets;
1034 	unsigned short target_num;
1035 	unsigned int wgt = 0, pref_wgt = 0;
1036 	unsigned int func_code, domain;
1037 	struct ap_message ap_msg;
1038 	int cpen, qpen, qid = 0, rc = -ENODEV;
1039 	struct module *mod;
1040 
1041 	trace_s390_zcrypt_req(xcrb, TP_ZSENDEP11CPRB);
1042 
1043 	ap_init_message(&ap_msg);
1044 
1045 	target_num = (unsigned short)xcrb->targets_num;
1046 
1047 	/* empty list indicates autoselect (all available targets) */
1048 	targets = NULL;
1049 	if (target_num != 0) {
1050 		struct ep11_target_dev __user *uptr;
1051 
1052 		targets = kcalloc(target_num, sizeof(*targets), GFP_KERNEL);
1053 		if (!targets) {
1054 			func_code = 0;
1055 			rc = -ENOMEM;
1056 			goto out;
1057 		}
1058 
1059 		uptr = (struct ep11_target_dev __force __user *)xcrb->targets;
1060 		if (z_copy_from_user(userspace, targets, uptr,
1061 				     target_num * sizeof(*targets))) {
1062 			func_code = 0;
1063 			rc = -EFAULT;
1064 			goto out_free;
1065 		}
1066 	}
1067 
1068 	rc = prep_ep11_ap_msg(userspace, xcrb, &ap_msg, &func_code, &domain);
1069 	if (rc)
1070 		goto out_free;
1071 	print_hex_dump_debug("ep11req: ", DUMP_PREFIX_ADDRESS, 16, 1,
1072 			     ap_msg.msg, ap_msg.len, false);
1073 
1074 	if (perms != &ap_perms && domain < AUTOSEL_DOM) {
1075 		if (ap_msg.flags & AP_MSG_FLAG_ADMIN) {
1076 			if (!test_bit_inv(domain, perms->adm)) {
1077 				rc = -ENODEV;
1078 				goto out_free;
1079 			}
1080 		} else if ((ap_msg.flags & AP_MSG_FLAG_USAGE) == 0) {
1081 			rc = -EOPNOTSUPP;
1082 			goto out_free;
1083 		}
1084 	}
1085 
1086 	pref_zc = NULL;
1087 	pref_zq = NULL;
1088 	spin_lock(&zcrypt_list_lock);
1089 	for_each_zcrypt_card(zc) {
1090 		/* Check for usable EP11 card */
1091 		if (!zc->online || !zc->card->config || zc->card->chkstop ||
1092 		    !zc->card->hwinfo.ep11)
1093 			continue;
1094 		/* Check for user selected EP11 card */
1095 		if (targets &&
1096 		    !is_desired_ep11_card(zc->card->id, target_num, targets))
1097 			continue;
1098 		/* check if request size exceeds card max msg size */
1099 		if (ap_msg.len > zc->card->maxmsgsize)
1100 			continue;
1101 		/* check if device node has admission for this card */
1102 		if (!zcrypt_check_card(perms, zc->card->id))
1103 			continue;
1104 		/* get weight index of the card device	*/
1105 		wgt = speed_idx_ep11(func_code) * zc->speed_rating[SECKEY];
1106 		/* penalty if this msg was previously sent via this card */
1107 		cpen = (tr && tr->again_counter && tr->last_qid &&
1108 			AP_QID_CARD(tr->last_qid) == zc->card->id) ?
1109 			TRACK_AGAIN_CARD_WEIGHT_PENALTY : 0;
1110 		if (!zcrypt_card_compare(zc, pref_zc, wgt + cpen, pref_wgt))
1111 			continue;
1112 		for_each_zcrypt_queue(zq, zc) {
1113 			/* check if device is usable and eligible */
1114 			if (!zq->online || !zq->ops->send_ep11_cprb ||
1115 			    !ap_queue_usable(zq->queue) ||
1116 			    (targets &&
1117 			     !is_desired_ep11_queue(zq->queue->qid,
1118 						    target_num, targets)))
1119 				continue;
1120 			/* check if device node has admission for this queue */
1121 			if (!zcrypt_check_queue(perms,
1122 						AP_QID_QUEUE(zq->queue->qid)))
1123 				continue;
1124 			/* penalty if the msg was previously sent at this qid */
1125 			qpen = (tr && tr->again_counter && tr->last_qid &&
1126 				tr->last_qid == zq->queue->qid) ?
1127 				TRACK_AGAIN_QUEUE_WEIGHT_PENALTY : 0;
1128 			if (!zcrypt_queue_compare(zq, pref_zq,
1129 						  wgt + cpen + qpen, pref_wgt))
1130 				continue;
1131 			pref_zc = zc;
1132 			pref_zq = zq;
1133 			pref_wgt = wgt + cpen + qpen;
1134 		}
1135 	}
1136 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, wgt);
1137 	spin_unlock(&zcrypt_list_lock);
1138 
1139 	if (!pref_zq) {
1140 		if (targets && target_num == 1) {
1141 			pr_debug("no match for address %02x.%04x => ENODEV\n",
1142 				 (int)targets->ap_id, (int)targets->dom_id);
1143 		} else if (targets) {
1144 			pr_debug("no match for %d target addrs => ENODEV\n",
1145 				 (int)target_num);
1146 		} else {
1147 			pr_debug("no match for address ff.ffff => ENODEV\n");
1148 		}
1149 		rc = -ENODEV;
1150 		goto out_free;
1151 	}
1152 
1153 	qid = pref_zq->queue->qid;
1154 	rc = pref_zq->ops->send_ep11_cprb(userspace, pref_zq, xcrb, &ap_msg);
1155 	if (!rc) {
1156 		print_hex_dump_debug("ep11rpl: ", DUMP_PREFIX_ADDRESS, 16, 1,
1157 				     ap_msg.msg, ap_msg.len, false);
1158 	}
1159 
1160 	spin_lock(&zcrypt_list_lock);
1161 	zcrypt_drop_queue(pref_zc, pref_zq, mod, wgt);
1162 	spin_unlock(&zcrypt_list_lock);
1163 
1164 out_free:
1165 	kfree(targets);
1166 out:
1167 	ap_release_message(&ap_msg);
1168 	if (tr) {
1169 		tr->last_rc = rc;
1170 		tr->last_qid = qid;
1171 	}
1172 	trace_s390_zcrypt_rep(xcrb, func_code, rc,
1173 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
1174 	return rc;
1175 }
1176 
zcrypt_send_ep11_cprb(struct ep11_urb * xcrb)1177 long zcrypt_send_ep11_cprb(struct ep11_urb *xcrb)
1178 {
1179 	struct zcrypt_track tr;
1180 	int rc;
1181 
1182 	memset(&tr, 0, sizeof(tr));
1183 
1184 	do {
1185 		rc = _zcrypt_send_ep11_cprb(false, &ap_perms, &tr, xcrb);
1186 	} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1187 
1188 	/* on ENODEV failure: retry once again after a requested rescan */
1189 	if (rc == -ENODEV && zcrypt_process_rescan())
1190 		do {
1191 			rc = _zcrypt_send_ep11_cprb(false, &ap_perms, &tr, xcrb);
1192 		} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1193 	if (rc == -EAGAIN && tr.again_counter >= TRACK_AGAIN_MAX)
1194 		rc = -EIO;
1195 	if (rc)
1196 		pr_debug("rc=%d\n", rc);
1197 
1198 	return rc;
1199 }
1200 EXPORT_SYMBOL(zcrypt_send_ep11_cprb);
1201 
zcrypt_rng(char * buffer)1202 static long zcrypt_rng(char *buffer)
1203 {
1204 	struct zcrypt_card *zc, *pref_zc;
1205 	struct zcrypt_queue *zq, *pref_zq;
1206 	unsigned int wgt = 0, pref_wgt = 0;
1207 	unsigned int func_code;
1208 	struct ap_message ap_msg;
1209 	unsigned int domain;
1210 	int qid = 0, rc = -ENODEV;
1211 	struct module *mod;
1212 
1213 	trace_s390_zcrypt_req(buffer, TP_HWRNGCPRB);
1214 
1215 	ap_init_message(&ap_msg);
1216 	rc = prep_rng_ap_msg(&ap_msg, &func_code, &domain);
1217 	if (rc)
1218 		goto out;
1219 
1220 	pref_zc = NULL;
1221 	pref_zq = NULL;
1222 	spin_lock(&zcrypt_list_lock);
1223 	for_each_zcrypt_card(zc) {
1224 		/* Check for usable CCA card */
1225 		if (!zc->online || !zc->card->config || zc->card->chkstop ||
1226 		    !zc->card->hwinfo.cca)
1227 			continue;
1228 		/* get weight index of the card device	*/
1229 		wgt = zc->speed_rating[func_code];
1230 		if (!zcrypt_card_compare(zc, pref_zc, wgt, pref_wgt))
1231 			continue;
1232 		for_each_zcrypt_queue(zq, zc) {
1233 			/* check if device is usable and eligible */
1234 			if (!zq->online || !zq->ops->rng ||
1235 			    !ap_queue_usable(zq->queue))
1236 				continue;
1237 			if (!zcrypt_queue_compare(zq, pref_zq, wgt, pref_wgt))
1238 				continue;
1239 			pref_zc = zc;
1240 			pref_zq = zq;
1241 			pref_wgt = wgt;
1242 		}
1243 	}
1244 	pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, wgt);
1245 	spin_unlock(&zcrypt_list_lock);
1246 
1247 	if (!pref_zq) {
1248 		pr_debug("no matching queue found => ENODEV\n");
1249 		rc = -ENODEV;
1250 		goto out;
1251 	}
1252 
1253 	qid = pref_zq->queue->qid;
1254 	rc = pref_zq->ops->rng(pref_zq, buffer, &ap_msg);
1255 
1256 	spin_lock(&zcrypt_list_lock);
1257 	zcrypt_drop_queue(pref_zc, pref_zq, mod, wgt);
1258 	spin_unlock(&zcrypt_list_lock);
1259 
1260 out:
1261 	ap_release_message(&ap_msg);
1262 	trace_s390_zcrypt_rep(buffer, func_code, rc,
1263 			      AP_QID_CARD(qid), AP_QID_QUEUE(qid));
1264 	return rc;
1265 }
1266 
zcrypt_device_status_mask(struct zcrypt_device_status * devstatus)1267 static void zcrypt_device_status_mask(struct zcrypt_device_status *devstatus)
1268 {
1269 	struct zcrypt_card *zc;
1270 	struct zcrypt_queue *zq;
1271 	struct zcrypt_device_status *stat;
1272 	int card, queue;
1273 
1274 	memset(devstatus, 0, MAX_ZDEV_ENTRIES
1275 	       * sizeof(struct zcrypt_device_status));
1276 
1277 	spin_lock(&zcrypt_list_lock);
1278 	for_each_zcrypt_card(zc) {
1279 		for_each_zcrypt_queue(zq, zc) {
1280 			card = AP_QID_CARD(zq->queue->qid);
1281 			if (card >= MAX_ZDEV_CARDIDS)
1282 				continue;
1283 			queue = AP_QID_QUEUE(zq->queue->qid);
1284 			stat = &devstatus[card * AP_DOMAINS + queue];
1285 			stat->hwtype = zc->card->ap_dev.device_type;
1286 			stat->functions = zc->card->hwinfo.fac >> 26;
1287 			stat->qid = zq->queue->qid;
1288 			stat->online = zq->online ? 0x01 : 0x00;
1289 		}
1290 	}
1291 	spin_unlock(&zcrypt_list_lock);
1292 }
1293 
zcrypt_device_status_mask_ext(struct zcrypt_device_status_ext * devstatus)1294 void zcrypt_device_status_mask_ext(struct zcrypt_device_status_ext *devstatus)
1295 {
1296 	struct zcrypt_card *zc;
1297 	struct zcrypt_queue *zq;
1298 	struct zcrypt_device_status_ext *stat;
1299 	int card, queue;
1300 
1301 	spin_lock(&zcrypt_list_lock);
1302 	for_each_zcrypt_card(zc) {
1303 		for_each_zcrypt_queue(zq, zc) {
1304 			card = AP_QID_CARD(zq->queue->qid);
1305 			queue = AP_QID_QUEUE(zq->queue->qid);
1306 			stat = &devstatus[card * AP_DOMAINS + queue];
1307 			stat->hwtype = zc->card->ap_dev.device_type;
1308 			stat->functions = zc->card->hwinfo.fac >> 26;
1309 			stat->qid = zq->queue->qid;
1310 			stat->online = zq->online ? 0x01 : 0x00;
1311 		}
1312 	}
1313 	spin_unlock(&zcrypt_list_lock);
1314 }
1315 EXPORT_SYMBOL(zcrypt_device_status_mask_ext);
1316 
zcrypt_device_status_ext(int card,int queue,struct zcrypt_device_status_ext * devstat)1317 int zcrypt_device_status_ext(int card, int queue,
1318 			     struct zcrypt_device_status_ext *devstat)
1319 {
1320 	struct zcrypt_card *zc;
1321 	struct zcrypt_queue *zq;
1322 
1323 	memset(devstat, 0, sizeof(*devstat));
1324 
1325 	spin_lock(&zcrypt_list_lock);
1326 	for_each_zcrypt_card(zc) {
1327 		for_each_zcrypt_queue(zq, zc) {
1328 			if (card == AP_QID_CARD(zq->queue->qid) &&
1329 			    queue == AP_QID_QUEUE(zq->queue->qid)) {
1330 				devstat->hwtype = zc->card->ap_dev.device_type;
1331 				devstat->functions = zc->card->hwinfo.fac >> 26;
1332 				devstat->qid = zq->queue->qid;
1333 				devstat->online = zq->online ? 0x01 : 0x00;
1334 				spin_unlock(&zcrypt_list_lock);
1335 				return 0;
1336 			}
1337 		}
1338 	}
1339 	spin_unlock(&zcrypt_list_lock);
1340 
1341 	return -ENODEV;
1342 }
1343 EXPORT_SYMBOL(zcrypt_device_status_ext);
1344 
zcrypt_status_mask(char status[],size_t max_adapters)1345 static void zcrypt_status_mask(char status[], size_t max_adapters)
1346 {
1347 	struct zcrypt_card *zc;
1348 	struct zcrypt_queue *zq;
1349 	int card;
1350 
1351 	memset(status, 0, max_adapters);
1352 	spin_lock(&zcrypt_list_lock);
1353 	for_each_zcrypt_card(zc) {
1354 		for_each_zcrypt_queue(zq, zc) {
1355 			card = AP_QID_CARD(zq->queue->qid);
1356 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index ||
1357 			    card >= max_adapters)
1358 				continue;
1359 			status[card] = zc->online ? zc->user_space_type : 0x0d;
1360 		}
1361 	}
1362 	spin_unlock(&zcrypt_list_lock);
1363 }
1364 
zcrypt_qdepth_mask(char qdepth[],size_t max_adapters)1365 static void zcrypt_qdepth_mask(char qdepth[], size_t max_adapters)
1366 {
1367 	struct zcrypt_card *zc;
1368 	struct zcrypt_queue *zq;
1369 	int card;
1370 
1371 	memset(qdepth, 0, max_adapters);
1372 	spin_lock(&zcrypt_list_lock);
1373 	local_bh_disable();
1374 	for_each_zcrypt_card(zc) {
1375 		for_each_zcrypt_queue(zq, zc) {
1376 			card = AP_QID_CARD(zq->queue->qid);
1377 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index ||
1378 			    card >= max_adapters)
1379 				continue;
1380 			spin_lock(&zq->queue->lock);
1381 			qdepth[card] =
1382 				zq->queue->pendingq_count +
1383 				zq->queue->requestq_count;
1384 			spin_unlock(&zq->queue->lock);
1385 		}
1386 	}
1387 	local_bh_enable();
1388 	spin_unlock(&zcrypt_list_lock);
1389 }
1390 
zcrypt_perdev_reqcnt(u32 reqcnt[],size_t max_adapters)1391 static void zcrypt_perdev_reqcnt(u32 reqcnt[], size_t max_adapters)
1392 {
1393 	struct zcrypt_card *zc;
1394 	struct zcrypt_queue *zq;
1395 	int card;
1396 	u64 cnt;
1397 
1398 	memset(reqcnt, 0, sizeof(int) * max_adapters);
1399 	spin_lock(&zcrypt_list_lock);
1400 	local_bh_disable();
1401 	for_each_zcrypt_card(zc) {
1402 		for_each_zcrypt_queue(zq, zc) {
1403 			card = AP_QID_CARD(zq->queue->qid);
1404 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index ||
1405 			    card >= max_adapters)
1406 				continue;
1407 			spin_lock(&zq->queue->lock);
1408 			cnt = zq->queue->total_request_count;
1409 			spin_unlock(&zq->queue->lock);
1410 			reqcnt[card] = (cnt < UINT_MAX) ? (u32)cnt : UINT_MAX;
1411 		}
1412 	}
1413 	local_bh_enable();
1414 	spin_unlock(&zcrypt_list_lock);
1415 }
1416 
zcrypt_pendingq_count(void)1417 static int zcrypt_pendingq_count(void)
1418 {
1419 	struct zcrypt_card *zc;
1420 	struct zcrypt_queue *zq;
1421 	int pendingq_count;
1422 
1423 	pendingq_count = 0;
1424 	spin_lock(&zcrypt_list_lock);
1425 	local_bh_disable();
1426 	for_each_zcrypt_card(zc) {
1427 		for_each_zcrypt_queue(zq, zc) {
1428 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index)
1429 				continue;
1430 			spin_lock(&zq->queue->lock);
1431 			pendingq_count += zq->queue->pendingq_count;
1432 			spin_unlock(&zq->queue->lock);
1433 		}
1434 	}
1435 	local_bh_enable();
1436 	spin_unlock(&zcrypt_list_lock);
1437 	return pendingq_count;
1438 }
1439 
zcrypt_requestq_count(void)1440 static int zcrypt_requestq_count(void)
1441 {
1442 	struct zcrypt_card *zc;
1443 	struct zcrypt_queue *zq;
1444 	int requestq_count;
1445 
1446 	requestq_count = 0;
1447 	spin_lock(&zcrypt_list_lock);
1448 	local_bh_disable();
1449 	for_each_zcrypt_card(zc) {
1450 		for_each_zcrypt_queue(zq, zc) {
1451 			if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index)
1452 				continue;
1453 			spin_lock(&zq->queue->lock);
1454 			requestq_count += zq->queue->requestq_count;
1455 			spin_unlock(&zq->queue->lock);
1456 		}
1457 	}
1458 	local_bh_enable();
1459 	spin_unlock(&zcrypt_list_lock);
1460 	return requestq_count;
1461 }
1462 
icarsamodexpo_ioctl(struct ap_perms * perms,unsigned long arg)1463 static int icarsamodexpo_ioctl(struct ap_perms *perms, unsigned long arg)
1464 {
1465 	int rc;
1466 	struct zcrypt_track tr;
1467 	struct ica_rsa_modexpo mex;
1468 	struct ica_rsa_modexpo __user *umex = (void __user *)arg;
1469 
1470 	memset(&tr, 0, sizeof(tr));
1471 	if (copy_from_user(&mex, umex, sizeof(mex)))
1472 		return -EFAULT;
1473 
1474 	do {
1475 		rc = zcrypt_rsa_modexpo(perms, &tr, &mex);
1476 	} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1477 
1478 	/* on ENODEV failure: retry once again after a requested rescan */
1479 	if (rc == -ENODEV && zcrypt_process_rescan())
1480 		do {
1481 			rc = zcrypt_rsa_modexpo(perms, &tr, &mex);
1482 		} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1483 	if (rc == -EAGAIN && tr.again_counter >= TRACK_AGAIN_MAX)
1484 		rc = -EIO;
1485 	if (rc) {
1486 		pr_debug("ioctl ICARSAMODEXPO rc=%d\n", rc);
1487 		return rc;
1488 	}
1489 	return put_user(mex.outputdatalength, &umex->outputdatalength);
1490 }
1491 
icarsacrt_ioctl(struct ap_perms * perms,unsigned long arg)1492 static int icarsacrt_ioctl(struct ap_perms *perms, unsigned long arg)
1493 {
1494 	int rc;
1495 	struct zcrypt_track tr;
1496 	struct ica_rsa_modexpo_crt crt;
1497 	struct ica_rsa_modexpo_crt __user *ucrt = (void __user *)arg;
1498 
1499 	memset(&tr, 0, sizeof(tr));
1500 	if (copy_from_user(&crt, ucrt, sizeof(crt)))
1501 		return -EFAULT;
1502 
1503 	do {
1504 		rc = zcrypt_rsa_crt(perms, &tr, &crt);
1505 	} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1506 
1507 	/* on ENODEV failure: retry once again after a requested rescan */
1508 	if (rc == -ENODEV && zcrypt_process_rescan())
1509 		do {
1510 			rc = zcrypt_rsa_crt(perms, &tr, &crt);
1511 		} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1512 	if (rc == -EAGAIN && tr.again_counter >= TRACK_AGAIN_MAX)
1513 		rc = -EIO;
1514 	if (rc) {
1515 		pr_debug("ioctl ICARSACRT rc=%d\n", rc);
1516 		return rc;
1517 	}
1518 	return put_user(crt.outputdatalength, &ucrt->outputdatalength);
1519 }
1520 
zsecsendcprb_ioctl(struct ap_perms * perms,unsigned long arg)1521 static int zsecsendcprb_ioctl(struct ap_perms *perms, unsigned long arg)
1522 {
1523 	int rc;
1524 	struct ica_xcRB xcrb;
1525 	struct zcrypt_track tr;
1526 	struct ica_xcRB __user *uxcrb = (void __user *)arg;
1527 
1528 	memset(&tr, 0, sizeof(tr));
1529 	if (copy_from_user(&xcrb, uxcrb, sizeof(xcrb)))
1530 		return -EFAULT;
1531 
1532 	do {
1533 		rc = _zcrypt_send_cprb(true, perms, &tr, &xcrb);
1534 	} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1535 
1536 	/* on ENODEV failure: retry once again after a requested rescan */
1537 	if (rc == -ENODEV && zcrypt_process_rescan())
1538 		do {
1539 			rc = _zcrypt_send_cprb(true, perms, &tr, &xcrb);
1540 		} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1541 	if (rc == -EAGAIN && tr.again_counter >= TRACK_AGAIN_MAX)
1542 		rc = -EIO;
1543 	if (rc)
1544 		pr_debug("ioctl ZSENDCPRB rc=%d status=0x%x\n",
1545 			 rc, xcrb.status);
1546 	if (copy_to_user(uxcrb, &xcrb, sizeof(xcrb)))
1547 		return -EFAULT;
1548 	return rc;
1549 }
1550 
zsendep11cprb_ioctl(struct ap_perms * perms,unsigned long arg)1551 static int zsendep11cprb_ioctl(struct ap_perms *perms, unsigned long arg)
1552 {
1553 	int rc;
1554 	struct ep11_urb xcrb;
1555 	struct zcrypt_track tr;
1556 	struct ep11_urb __user *uxcrb = (void __user *)arg;
1557 
1558 	memset(&tr, 0, sizeof(tr));
1559 	if (copy_from_user(&xcrb, uxcrb, sizeof(xcrb)))
1560 		return -EFAULT;
1561 
1562 	do {
1563 		rc = _zcrypt_send_ep11_cprb(true, perms, &tr, &xcrb);
1564 	} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1565 
1566 	/* on ENODEV failure: retry once again after a requested rescan */
1567 	if (rc == -ENODEV && zcrypt_process_rescan())
1568 		do {
1569 			rc = _zcrypt_send_ep11_cprb(true, perms, &tr, &xcrb);
1570 		} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1571 	if (rc == -EAGAIN && tr.again_counter >= TRACK_AGAIN_MAX)
1572 		rc = -EIO;
1573 	if (rc)
1574 		pr_debug("ioctl ZSENDEP11CPRB rc=%d\n", rc);
1575 	if (copy_to_user(uxcrb, &xcrb, sizeof(xcrb)))
1576 		return -EFAULT;
1577 	return rc;
1578 }
1579 
zcrypt_unlocked_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)1580 static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
1581 				  unsigned long arg)
1582 {
1583 	int rc;
1584 	struct ap_perms *perms =
1585 		(struct ap_perms *)filp->private_data;
1586 
1587 	rc = zcrypt_check_ioctl(perms, cmd);
1588 	if (rc)
1589 		return rc;
1590 
1591 	switch (cmd) {
1592 	case ICARSAMODEXPO:
1593 		return icarsamodexpo_ioctl(perms, arg);
1594 	case ICARSACRT:
1595 		return icarsacrt_ioctl(perms, arg);
1596 	case ZSECSENDCPRB:
1597 		return zsecsendcprb_ioctl(perms, arg);
1598 	case ZSENDEP11CPRB:
1599 		return zsendep11cprb_ioctl(perms, arg);
1600 	case ZCRYPT_DEVICE_STATUS: {
1601 		struct zcrypt_device_status_ext *device_status;
1602 		size_t total_size = MAX_ZDEV_ENTRIES_EXT
1603 			* sizeof(struct zcrypt_device_status_ext);
1604 
1605 		device_status = kvcalloc(MAX_ZDEV_ENTRIES_EXT,
1606 					 sizeof(struct zcrypt_device_status_ext),
1607 					 GFP_KERNEL);
1608 		if (!device_status)
1609 			return -ENOMEM;
1610 		zcrypt_device_status_mask_ext(device_status);
1611 		if (copy_to_user((char __user *)arg, device_status,
1612 				 total_size))
1613 			rc = -EFAULT;
1614 		kvfree(device_status);
1615 		return rc;
1616 	}
1617 	case ZCRYPT_STATUS_MASK: {
1618 		char status[AP_DEVICES];
1619 
1620 		zcrypt_status_mask(status, AP_DEVICES);
1621 		if (copy_to_user((char __user *)arg, status, sizeof(status)))
1622 			return -EFAULT;
1623 		return 0;
1624 	}
1625 	case ZCRYPT_QDEPTH_MASK: {
1626 		char qdepth[AP_DEVICES];
1627 
1628 		zcrypt_qdepth_mask(qdepth, AP_DEVICES);
1629 		if (copy_to_user((char __user *)arg, qdepth, sizeof(qdepth)))
1630 			return -EFAULT;
1631 		return 0;
1632 	}
1633 	case ZCRYPT_PERDEV_REQCNT: {
1634 		u32 *reqcnt;
1635 
1636 		reqcnt = kcalloc(AP_DEVICES, sizeof(u32), GFP_KERNEL);
1637 		if (!reqcnt)
1638 			return -ENOMEM;
1639 		zcrypt_perdev_reqcnt(reqcnt, AP_DEVICES);
1640 		if (copy_to_user((int __user *)arg, reqcnt,
1641 				 sizeof(u32) * AP_DEVICES))
1642 			rc = -EFAULT;
1643 		kfree(reqcnt);
1644 		return rc;
1645 	}
1646 	case Z90STAT_REQUESTQ_COUNT:
1647 		return put_user(zcrypt_requestq_count(), (int __user *)arg);
1648 	case Z90STAT_PENDINGQ_COUNT:
1649 		return put_user(zcrypt_pendingq_count(), (int __user *)arg);
1650 	case Z90STAT_TOTALOPEN_COUNT:
1651 		return put_user(atomic_read(&zcrypt_open_count),
1652 				(int __user *)arg);
1653 	case Z90STAT_DOMAIN_INDEX:
1654 		return put_user(ap_domain_index, (int __user *)arg);
1655 	/*
1656 	 * Deprecated ioctls
1657 	 */
1658 	case ZDEVICESTATUS: {
1659 		/* the old ioctl supports only 64 adapters */
1660 		struct zcrypt_device_status *device_status;
1661 		size_t total_size = MAX_ZDEV_ENTRIES
1662 			* sizeof(struct zcrypt_device_status);
1663 
1664 		device_status = kzalloc(total_size, GFP_KERNEL);
1665 		if (!device_status)
1666 			return -ENOMEM;
1667 		zcrypt_device_status_mask(device_status);
1668 		if (copy_to_user((char __user *)arg, device_status,
1669 				 total_size))
1670 			rc = -EFAULT;
1671 		kfree(device_status);
1672 		return rc;
1673 	}
1674 	case Z90STAT_STATUS_MASK: {
1675 		/* the old ioctl supports only 64 adapters */
1676 		char status[MAX_ZDEV_CARDIDS];
1677 
1678 		zcrypt_status_mask(status, MAX_ZDEV_CARDIDS);
1679 		if (copy_to_user((char __user *)arg, status, sizeof(status)))
1680 			return -EFAULT;
1681 		return 0;
1682 	}
1683 	case Z90STAT_QDEPTH_MASK: {
1684 		/* the old ioctl supports only 64 adapters */
1685 		char qdepth[MAX_ZDEV_CARDIDS];
1686 
1687 		zcrypt_qdepth_mask(qdepth, MAX_ZDEV_CARDIDS);
1688 		if (copy_to_user((char __user *)arg, qdepth, sizeof(qdepth)))
1689 			return -EFAULT;
1690 		return 0;
1691 	}
1692 	case Z90STAT_PERDEV_REQCNT: {
1693 		/* the old ioctl supports only 64 adapters */
1694 		u32 reqcnt[MAX_ZDEV_CARDIDS];
1695 
1696 		zcrypt_perdev_reqcnt(reqcnt, MAX_ZDEV_CARDIDS);
1697 		if (copy_to_user((int __user *)arg, reqcnt, sizeof(reqcnt)))
1698 			return -EFAULT;
1699 		return 0;
1700 	}
1701 	/* unknown ioctl number */
1702 	default:
1703 		pr_debug("unknown ioctl 0x%08x\n", cmd);
1704 		return -ENOIOCTLCMD;
1705 	}
1706 }
1707 
1708 #ifdef CONFIG_COMPAT
1709 /*
1710  * ioctl32 conversion routines
1711  */
1712 struct compat_ica_rsa_modexpo {
1713 	compat_uptr_t	inputdata;
1714 	unsigned int	inputdatalength;
1715 	compat_uptr_t	outputdata;
1716 	unsigned int	outputdatalength;
1717 	compat_uptr_t	b_key;
1718 	compat_uptr_t	n_modulus;
1719 };
1720 
trans_modexpo32(struct ap_perms * perms,struct file * filp,unsigned int cmd,unsigned long arg)1721 static long trans_modexpo32(struct ap_perms *perms, struct file *filp,
1722 			    unsigned int cmd, unsigned long arg)
1723 {
1724 	struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg);
1725 	struct compat_ica_rsa_modexpo mex32;
1726 	struct ica_rsa_modexpo mex64;
1727 	struct zcrypt_track tr;
1728 	long rc;
1729 
1730 	memset(&tr, 0, sizeof(tr));
1731 	if (copy_from_user(&mex32, umex32, sizeof(mex32)))
1732 		return -EFAULT;
1733 	mex64.inputdata = compat_ptr(mex32.inputdata);
1734 	mex64.inputdatalength = mex32.inputdatalength;
1735 	mex64.outputdata = compat_ptr(mex32.outputdata);
1736 	mex64.outputdatalength = mex32.outputdatalength;
1737 	mex64.b_key = compat_ptr(mex32.b_key);
1738 	mex64.n_modulus = compat_ptr(mex32.n_modulus);
1739 	do {
1740 		rc = zcrypt_rsa_modexpo(perms, &tr, &mex64);
1741 	} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1742 
1743 	/* on ENODEV failure: retry once again after a requested rescan */
1744 	if (rc == -ENODEV && zcrypt_process_rescan())
1745 		do {
1746 			rc = zcrypt_rsa_modexpo(perms, &tr, &mex64);
1747 		} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1748 	if (rc == -EAGAIN && tr.again_counter >= TRACK_AGAIN_MAX)
1749 		rc = -EIO;
1750 	if (rc)
1751 		return rc;
1752 	return put_user(mex64.outputdatalength,
1753 			&umex32->outputdatalength);
1754 }
1755 
1756 struct compat_ica_rsa_modexpo_crt {
1757 	compat_uptr_t	inputdata;
1758 	unsigned int	inputdatalength;
1759 	compat_uptr_t	outputdata;
1760 	unsigned int	outputdatalength;
1761 	compat_uptr_t	bp_key;
1762 	compat_uptr_t	bq_key;
1763 	compat_uptr_t	np_prime;
1764 	compat_uptr_t	nq_prime;
1765 	compat_uptr_t	u_mult_inv;
1766 };
1767 
trans_modexpo_crt32(struct ap_perms * perms,struct file * filp,unsigned int cmd,unsigned long arg)1768 static long trans_modexpo_crt32(struct ap_perms *perms, struct file *filp,
1769 				unsigned int cmd, unsigned long arg)
1770 {
1771 	struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg);
1772 	struct compat_ica_rsa_modexpo_crt crt32;
1773 	struct ica_rsa_modexpo_crt crt64;
1774 	struct zcrypt_track tr;
1775 	long rc;
1776 
1777 	memset(&tr, 0, sizeof(tr));
1778 	if (copy_from_user(&crt32, ucrt32, sizeof(crt32)))
1779 		return -EFAULT;
1780 	crt64.inputdata = compat_ptr(crt32.inputdata);
1781 	crt64.inputdatalength = crt32.inputdatalength;
1782 	crt64.outputdata = compat_ptr(crt32.outputdata);
1783 	crt64.outputdatalength = crt32.outputdatalength;
1784 	crt64.bp_key = compat_ptr(crt32.bp_key);
1785 	crt64.bq_key = compat_ptr(crt32.bq_key);
1786 	crt64.np_prime = compat_ptr(crt32.np_prime);
1787 	crt64.nq_prime = compat_ptr(crt32.nq_prime);
1788 	crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv);
1789 	do {
1790 		rc = zcrypt_rsa_crt(perms, &tr, &crt64);
1791 	} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1792 
1793 	/* on ENODEV failure: retry once again after a requested rescan */
1794 	if (rc == -ENODEV && zcrypt_process_rescan())
1795 		do {
1796 			rc = zcrypt_rsa_crt(perms, &tr, &crt64);
1797 		} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1798 	if (rc == -EAGAIN && tr.again_counter >= TRACK_AGAIN_MAX)
1799 		rc = -EIO;
1800 	if (rc)
1801 		return rc;
1802 	return put_user(crt64.outputdatalength,
1803 			&ucrt32->outputdatalength);
1804 }
1805 
1806 struct compat_ica_xcrb {
1807 	unsigned short	agent_ID;
1808 	unsigned int	user_defined;
1809 	unsigned short	request_ID;
1810 	unsigned int	request_control_blk_length;
1811 	unsigned char	padding1[16 - sizeof(compat_uptr_t)];
1812 	compat_uptr_t	request_control_blk_addr;
1813 	unsigned int	request_data_length;
1814 	char		padding2[16 - sizeof(compat_uptr_t)];
1815 	compat_uptr_t	request_data_address;
1816 	unsigned int	reply_control_blk_length;
1817 	char		padding3[16 - sizeof(compat_uptr_t)];
1818 	compat_uptr_t	reply_control_blk_addr;
1819 	unsigned int	reply_data_length;
1820 	char		padding4[16 - sizeof(compat_uptr_t)];
1821 	compat_uptr_t	reply_data_addr;
1822 	unsigned short	priority_window;
1823 	unsigned int	status;
1824 } __packed;
1825 
trans_xcrb32(struct ap_perms * perms,struct file * filp,unsigned int cmd,unsigned long arg)1826 static long trans_xcrb32(struct ap_perms *perms, struct file *filp,
1827 			 unsigned int cmd, unsigned long arg)
1828 {
1829 	struct compat_ica_xcrb __user *uxcrb32 = compat_ptr(arg);
1830 	struct compat_ica_xcrb xcrb32;
1831 	struct zcrypt_track tr;
1832 	struct ica_xcRB xcrb64;
1833 	long rc;
1834 
1835 	memset(&tr, 0, sizeof(tr));
1836 	if (copy_from_user(&xcrb32, uxcrb32, sizeof(xcrb32)))
1837 		return -EFAULT;
1838 	xcrb64.agent_ID = xcrb32.agent_ID;
1839 	xcrb64.user_defined = xcrb32.user_defined;
1840 	xcrb64.request_ID = xcrb32.request_ID;
1841 	xcrb64.request_control_blk_length =
1842 		xcrb32.request_control_blk_length;
1843 	xcrb64.request_control_blk_addr =
1844 		compat_ptr(xcrb32.request_control_blk_addr);
1845 	xcrb64.request_data_length =
1846 		xcrb32.request_data_length;
1847 	xcrb64.request_data_address =
1848 		compat_ptr(xcrb32.request_data_address);
1849 	xcrb64.reply_control_blk_length =
1850 		xcrb32.reply_control_blk_length;
1851 	xcrb64.reply_control_blk_addr =
1852 		compat_ptr(xcrb32.reply_control_blk_addr);
1853 	xcrb64.reply_data_length = xcrb32.reply_data_length;
1854 	xcrb64.reply_data_addr =
1855 		compat_ptr(xcrb32.reply_data_addr);
1856 	xcrb64.priority_window = xcrb32.priority_window;
1857 	xcrb64.status = xcrb32.status;
1858 	do {
1859 		rc = _zcrypt_send_cprb(true, perms, &tr, &xcrb64);
1860 	} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1861 
1862 	/* on ENODEV failure: retry once again after a requested rescan */
1863 	if (rc == -ENODEV && zcrypt_process_rescan())
1864 		do {
1865 			rc = _zcrypt_send_cprb(true, perms, &tr, &xcrb64);
1866 		} while (rc == -EAGAIN && ++tr.again_counter < TRACK_AGAIN_MAX);
1867 	if (rc == -EAGAIN && tr.again_counter >= TRACK_AGAIN_MAX)
1868 		rc = -EIO;
1869 	xcrb32.reply_control_blk_length = xcrb64.reply_control_blk_length;
1870 	xcrb32.reply_data_length = xcrb64.reply_data_length;
1871 	xcrb32.status = xcrb64.status;
1872 	if (copy_to_user(uxcrb32, &xcrb32, sizeof(xcrb32)))
1873 		return -EFAULT;
1874 	return rc;
1875 }
1876 
zcrypt_compat_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)1877 static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd,
1878 				unsigned long arg)
1879 {
1880 	int rc;
1881 	struct ap_perms *perms =
1882 		(struct ap_perms *)filp->private_data;
1883 
1884 	rc = zcrypt_check_ioctl(perms, cmd);
1885 	if (rc)
1886 		return rc;
1887 
1888 	if (cmd == ICARSAMODEXPO)
1889 		return trans_modexpo32(perms, filp, cmd, arg);
1890 	if (cmd == ICARSACRT)
1891 		return trans_modexpo_crt32(perms, filp, cmd, arg);
1892 	if (cmd == ZSECSENDCPRB)
1893 		return trans_xcrb32(perms, filp, cmd, arg);
1894 	return zcrypt_unlocked_ioctl(filp, cmd, arg);
1895 }
1896 #endif
1897 
1898 /*
1899  * Misc device file operations.
1900  */
1901 static const struct file_operations zcrypt_fops = {
1902 	.owner		= THIS_MODULE,
1903 	.read		= zcrypt_read,
1904 	.write		= zcrypt_write,
1905 	.unlocked_ioctl	= zcrypt_unlocked_ioctl,
1906 #ifdef CONFIG_COMPAT
1907 	.compat_ioctl	= zcrypt_compat_ioctl,
1908 #endif
1909 	.open		= zcrypt_open,
1910 	.release	= zcrypt_release,
1911 };
1912 
1913 /*
1914  * Misc device.
1915  */
1916 static struct miscdevice zcrypt_misc_device = {
1917 	.minor	    = MISC_DYNAMIC_MINOR,
1918 	.name	    = "z90crypt",
1919 	.fops	    = &zcrypt_fops,
1920 };
1921 
1922 static int zcrypt_rng_device_count;
1923 static u32 *zcrypt_rng_buffer;
1924 static int zcrypt_rng_buffer_index;
1925 static DEFINE_MUTEX(zcrypt_rng_mutex);
1926 
zcrypt_rng_data_read(struct hwrng * rng,u32 * data)1927 static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
1928 {
1929 	int rc;
1930 
1931 	/*
1932 	 * We don't need locking here because the RNG API guarantees serialized
1933 	 * read method calls.
1934 	 */
1935 	if (zcrypt_rng_buffer_index == 0) {
1936 		rc = zcrypt_rng((char *)zcrypt_rng_buffer);
1937 		/* on ENODEV failure: retry once again after an AP bus rescan */
1938 		if (rc == -ENODEV && zcrypt_process_rescan())
1939 			rc = zcrypt_rng((char *)zcrypt_rng_buffer);
1940 		if (rc < 0)
1941 			return -EIO;
1942 		zcrypt_rng_buffer_index = rc / sizeof(*data);
1943 	}
1944 	*data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index];
1945 	return sizeof(*data);
1946 }
1947 
1948 static struct hwrng zcrypt_rng_dev = {
1949 	.name		= "zcrypt",
1950 	.data_read	= zcrypt_rng_data_read,
1951 	.quality	= 990,
1952 };
1953 
zcrypt_rng_device_add(void)1954 int zcrypt_rng_device_add(void)
1955 {
1956 	int rc = 0;
1957 
1958 	mutex_lock(&zcrypt_rng_mutex);
1959 	if (zcrypt_rng_device_count == 0) {
1960 		zcrypt_rng_buffer = (u32 *)get_zeroed_page(GFP_KERNEL);
1961 		if (!zcrypt_rng_buffer) {
1962 			rc = -ENOMEM;
1963 			goto out;
1964 		}
1965 		zcrypt_rng_buffer_index = 0;
1966 		rc = hwrng_register(&zcrypt_rng_dev);
1967 		if (rc)
1968 			goto out_free;
1969 		zcrypt_rng_device_count = 1;
1970 	} else {
1971 		zcrypt_rng_device_count++;
1972 	}
1973 	mutex_unlock(&zcrypt_rng_mutex);
1974 	return 0;
1975 
1976 out_free:
1977 	free_page((unsigned long)zcrypt_rng_buffer);
1978 out:
1979 	mutex_unlock(&zcrypt_rng_mutex);
1980 	return rc;
1981 }
1982 
zcrypt_rng_device_remove(void)1983 void zcrypt_rng_device_remove(void)
1984 {
1985 	mutex_lock(&zcrypt_rng_mutex);
1986 	zcrypt_rng_device_count--;
1987 	if (zcrypt_rng_device_count == 0) {
1988 		hwrng_unregister(&zcrypt_rng_dev);
1989 		free_page((unsigned long)zcrypt_rng_buffer);
1990 	}
1991 	mutex_unlock(&zcrypt_rng_mutex);
1992 }
1993 
1994 /*
1995  * Wait until the zcrypt api is operational.
1996  * The AP bus scan and the binding of ap devices to device drivers is
1997  * an asynchronous job. This function waits until these initial jobs
1998  * are done and so the zcrypt api should be ready to serve crypto
1999  * requests - if there are resources available. The function uses an
2000  * internal timeout of 30s. The very first caller will either wait for
2001  * ap bus bindings complete or the timeout happens. This state will be
2002  * remembered for further callers which will only be blocked until a
2003  * decision is made (timeout or bindings complete).
2004  * On timeout -ETIME is returned, on success the return value is 0.
2005  */
zcrypt_wait_api_operational(void)2006 int zcrypt_wait_api_operational(void)
2007 {
2008 	static DEFINE_MUTEX(zcrypt_wait_api_lock);
2009 	static int zcrypt_wait_api_state;
2010 	int rc;
2011 
2012 	rc = mutex_lock_interruptible(&zcrypt_wait_api_lock);
2013 	if (rc)
2014 		return rc;
2015 
2016 	switch (zcrypt_wait_api_state) {
2017 	case 0:
2018 		/* initial state, invoke wait for the ap bus complete */
2019 		rc = ap_wait_apqn_bindings_complete(
2020 			msecs_to_jiffies(ZCRYPT_WAIT_BINDINGS_COMPLETE_MS));
2021 		switch (rc) {
2022 		case 0:
2023 			/* ap bus bindings are complete */
2024 			zcrypt_wait_api_state = 1;
2025 			break;
2026 		case -EINTR:
2027 			/* interrupted, go back to caller */
2028 			break;
2029 		case -ETIME:
2030 			/* timeout */
2031 			ZCRYPT_DBF_WARN("%s ap_wait_init_apqn_bindings_complete()=ETIME\n",
2032 					__func__);
2033 			zcrypt_wait_api_state = -ETIME;
2034 			break;
2035 		default:
2036 			/* other failure */
2037 			pr_debug("ap_wait_init_apqn_bindings_complete()=%d\n", rc);
2038 			break;
2039 		}
2040 		break;
2041 	case 1:
2042 		/* a previous caller already found ap bus bindings complete */
2043 		rc = 0;
2044 		break;
2045 	default:
2046 		/* a previous caller had timeout or other failure */
2047 		rc = zcrypt_wait_api_state;
2048 		break;
2049 	}
2050 
2051 	mutex_unlock(&zcrypt_wait_api_lock);
2052 
2053 	return rc;
2054 }
2055 EXPORT_SYMBOL(zcrypt_wait_api_operational);
2056 
zcrypt_debug_init(void)2057 int __init zcrypt_debug_init(void)
2058 {
2059 	zcrypt_dbf_info = debug_register("zcrypt", 2, 1,
2060 					 ZCRYPT_DBF_MAX_SPRINTF_ARGS * sizeof(long));
2061 	debug_register_view(zcrypt_dbf_info, &debug_sprintf_view);
2062 	debug_set_level(zcrypt_dbf_info, DBF_ERR);
2063 
2064 	return 0;
2065 }
2066 
zcrypt_debug_exit(void)2067 void zcrypt_debug_exit(void)
2068 {
2069 	debug_unregister(zcrypt_dbf_info);
2070 }
2071 
zcdn_init(void)2072 static int __init zcdn_init(void)
2073 {
2074 	int rc;
2075 
2076 	/* create a new class 'zcrypt' */
2077 	rc = class_register(&zcrypt_class);
2078 	if (rc)
2079 		goto out_class_register_failed;
2080 
2081 	/* alloc device minor range */
2082 	rc = alloc_chrdev_region(&zcrypt_devt,
2083 				 0, ZCRYPT_MAX_MINOR_NODES,
2084 				 ZCRYPT_NAME);
2085 	if (rc)
2086 		goto out_alloc_chrdev_failed;
2087 
2088 	cdev_init(&zcrypt_cdev, &zcrypt_fops);
2089 	zcrypt_cdev.owner = THIS_MODULE;
2090 	rc = cdev_add(&zcrypt_cdev, zcrypt_devt, ZCRYPT_MAX_MINOR_NODES);
2091 	if (rc)
2092 		goto out_cdev_add_failed;
2093 
2094 	/* need some class specific sysfs attributes */
2095 	rc = class_create_file(&zcrypt_class, &class_attr_zcdn_create);
2096 	if (rc)
2097 		goto out_class_create_file_1_failed;
2098 	rc = class_create_file(&zcrypt_class, &class_attr_zcdn_destroy);
2099 	if (rc)
2100 		goto out_class_create_file_2_failed;
2101 
2102 	return 0;
2103 
2104 out_class_create_file_2_failed:
2105 	class_remove_file(&zcrypt_class, &class_attr_zcdn_create);
2106 out_class_create_file_1_failed:
2107 	cdev_del(&zcrypt_cdev);
2108 out_cdev_add_failed:
2109 	unregister_chrdev_region(zcrypt_devt, ZCRYPT_MAX_MINOR_NODES);
2110 out_alloc_chrdev_failed:
2111 	class_unregister(&zcrypt_class);
2112 out_class_register_failed:
2113 	return rc;
2114 }
2115 
zcdn_exit(void)2116 static void zcdn_exit(void)
2117 {
2118 	class_remove_file(&zcrypt_class, &class_attr_zcdn_create);
2119 	class_remove_file(&zcrypt_class, &class_attr_zcdn_destroy);
2120 	zcdn_destroy_all();
2121 	cdev_del(&zcrypt_cdev);
2122 	unregister_chrdev_region(zcrypt_devt, ZCRYPT_MAX_MINOR_NODES);
2123 	class_unregister(&zcrypt_class);
2124 }
2125 
2126 /*
2127  * zcrypt_api_init(): Module initialization.
2128  *
2129  * The module initialization code.
2130  */
zcrypt_api_init(void)2131 int __init zcrypt_api_init(void)
2132 {
2133 	int rc;
2134 
2135 	rc = zcrypt_debug_init();
2136 	if (rc)
2137 		goto out;
2138 
2139 	rc = zcdn_init();
2140 	if (rc)
2141 		goto out;
2142 
2143 	/* Register the request sprayer. */
2144 	rc = misc_register(&zcrypt_misc_device);
2145 	if (rc < 0)
2146 		goto out_misc_register_failed;
2147 
2148 	zcrypt_msgtype6_init();
2149 	zcrypt_msgtype50_init();
2150 
2151 	return 0;
2152 
2153 out_misc_register_failed:
2154 	zcdn_exit();
2155 	zcrypt_debug_exit();
2156 out:
2157 	return rc;
2158 }
2159 
2160 /*
2161  * zcrypt_api_exit(): Module termination.
2162  *
2163  * The module termination code.
2164  */
zcrypt_api_exit(void)2165 void __exit zcrypt_api_exit(void)
2166 {
2167 	zcdn_exit();
2168 	misc_deregister(&zcrypt_misc_device);
2169 	zcrypt_msgtype6_exit();
2170 	zcrypt_msgtype50_exit();
2171 	zcrypt_ccamisc_exit();
2172 	zcrypt_ep11misc_exit();
2173 	zcrypt_debug_exit();
2174 }
2175 
2176 module_init(zcrypt_api_init);
2177 module_exit(zcrypt_api_exit);
2178