689c2af7026a3adcf08e2e6eb019d9352e6de9d4
[sfrench/cifs-2.6.git] / drivers / s390 / crypto / zcrypt_api.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  *  Copyright IBM Corp. 2001, 2018
4  *  Author(s): Robert Burroughs
5  *             Eric Rossman (edrossma@us.ibm.com)
6  *             Cornelia Huck <cornelia.huck@de.ibm.com>
7  *
8  *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
9  *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
10  *                                Ralph Wuerthner <rwuerthn@de.ibm.com>
11  *  MSGTYPE restruct:             Holger Dengler <hd@linux.vnet.ibm.com>
12  *  Multiple device nodes: Harald Freudenberger <freude@linux.ibm.com>
13  */
14
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/miscdevice.h>
19 #include <linux/fs.h>
20 #include <linux/compat.h>
21 #include <linux/slab.h>
22 #include <linux/atomic.h>
23 #include <linux/uaccess.h>
24 #include <linux/hw_random.h>
25 #include <linux/debugfs.h>
26 #include <linux/cdev.h>
27 #include <linux/ctype.h>
28 #include <asm/debug.h>
29
30 #define CREATE_TRACE_POINTS
31 #include <asm/trace/zcrypt.h>
32
33 #include "zcrypt_api.h"
34 #include "zcrypt_debug.h"
35
36 #include "zcrypt_msgtype6.h"
37 #include "zcrypt_msgtype50.h"
38
39 /*
40  * Module description.
41  */
42 MODULE_AUTHOR("IBM Corporation");
43 MODULE_DESCRIPTION("Cryptographic Coprocessor interface, " \
44                    "Copyright IBM Corp. 2001, 2012");
45 MODULE_LICENSE("GPL");
46
47 /*
48  * zcrypt tracepoint functions
49  */
50 EXPORT_TRACEPOINT_SYMBOL(s390_zcrypt_req);
51 EXPORT_TRACEPOINT_SYMBOL(s390_zcrypt_rep);
52
53 static int zcrypt_hwrng_seed = 1;
54 module_param_named(hwrng_seed, zcrypt_hwrng_seed, int, 0440);
55 MODULE_PARM_DESC(hwrng_seed, "Turn on/off hwrng auto seed, default is 1 (on).");
56
57 DEFINE_SPINLOCK(zcrypt_list_lock);
58 LIST_HEAD(zcrypt_card_list);
59 int zcrypt_device_count;
60
61 static atomic_t zcrypt_open_count = ATOMIC_INIT(0);
62 static atomic_t zcrypt_rescan_count = ATOMIC_INIT(0);
63
64 atomic_t zcrypt_rescan_req = ATOMIC_INIT(0);
65 EXPORT_SYMBOL(zcrypt_rescan_req);
66
67 static LIST_HEAD(zcrypt_ops_list);
68
69 /* Zcrypt related debug feature stuff. */
70 debug_info_t *zcrypt_dbf_info;
71
72 /**
73  * Process a rescan of the transport layer.
74  *
75  * Returns 1, if the rescan has been processed, otherwise 0.
76  */
77 static inline int zcrypt_process_rescan(void)
78 {
79         if (atomic_read(&zcrypt_rescan_req)) {
80                 atomic_set(&zcrypt_rescan_req, 0);
81                 atomic_inc(&zcrypt_rescan_count);
82                 ap_bus_force_rescan();
83                 ZCRYPT_DBF(DBF_INFO, "rescan count=%07d\n",
84                            atomic_inc_return(&zcrypt_rescan_count));
85                 return 1;
86         }
87         return 0;
88 }
89
90 void zcrypt_msgtype_register(struct zcrypt_ops *zops)
91 {
92         list_add_tail(&zops->list, &zcrypt_ops_list);
93 }
94
95 void zcrypt_msgtype_unregister(struct zcrypt_ops *zops)
96 {
97         list_del_init(&zops->list);
98 }
99
100 struct zcrypt_ops *zcrypt_msgtype(unsigned char *name, int variant)
101 {
102         struct zcrypt_ops *zops;
103
104         list_for_each_entry(zops, &zcrypt_ops_list, list)
105                 if ((zops->variant == variant) &&
106                     (!strncmp(zops->name, name, sizeof(zops->name))))
107                         return zops;
108         return NULL;
109 }
110 EXPORT_SYMBOL(zcrypt_msgtype);
111
112 /*
113  * Multi device nodes extension functions.
114  */
115
116 #ifdef CONFIG_ZCRYPT_MULTIDEVNODES
117
118 struct zcdn_device;
119
120 static struct class *zcrypt_class;
121 static dev_t zcrypt_devt;
122 static struct cdev zcrypt_cdev;
123
124 struct zcdn_device {
125         struct device device;
126         struct ap_perms perms;
127 };
128
129 #define to_zcdn_dev(x) container_of((x), struct zcdn_device, device)
130
131 #define ZCDN_MAX_NAME 32
132
133 static int zcdn_create(const char *name);
134 static int zcdn_destroy(const char *name);
135
136 /* helper function, matches the name for find_zcdndev_by_name() */
137 static int __match_zcdn_name(struct device *dev, const void *data)
138 {
139         return strcmp(dev_name(dev), (const char *)data) == 0;
140 }
141
142 /* helper function, matches the devt value for find_zcdndev_by_devt() */
143 static int __match_zcdn_devt(struct device *dev, const void *data)
144 {
145         return dev->devt == *((dev_t *) data);
146 }
147
148 /*
149  * Find zcdn device by name.
150  * Returns reference to the zcdn device which needs to be released
151  * with put_device() after use.
152  */
153 static inline struct zcdn_device *find_zcdndev_by_name(const char *name)
154 {
155         struct device *dev =
156                 class_find_device(zcrypt_class, NULL,
157                                   (void *) name,
158                                   __match_zcdn_name);
159
160         return dev ? to_zcdn_dev(dev) : NULL;
161 }
162
163 /*
164  * Find zcdn device by devt value.
165  * Returns reference to the zcdn device which needs to be released
166  * with put_device() after use.
167  */
168 static inline struct zcdn_device *find_zcdndev_by_devt(dev_t devt)
169 {
170         struct device *dev =
171                 class_find_device(zcrypt_class, NULL,
172                                   (void *) &devt,
173                                   __match_zcdn_devt);
174
175         return dev ? to_zcdn_dev(dev) : NULL;
176 }
177
178 static ssize_t ioctlmask_show(struct device *dev,
179                               struct device_attribute *attr,
180                               char *buf)
181 {
182         int i, rc;
183         struct zcdn_device *zcdndev = to_zcdn_dev(dev);
184
185         if (mutex_lock_interruptible(&ap_perms_mutex))
186                 return -ERESTARTSYS;
187
188         buf[0] = '0';
189         buf[1] = 'x';
190         for (i = 0; i < sizeof(zcdndev->perms.ioctlm) / sizeof(long); i++)
191                 snprintf(buf + 2 + 2 * i * sizeof(long),
192                          PAGE_SIZE - 2 - 2 * i * sizeof(long),
193                          "%016lx", zcdndev->perms.ioctlm[i]);
194         buf[2 + 2 * i * sizeof(long)] = '\n';
195         buf[2 + 2 * i * sizeof(long) + 1] = '\0';
196         rc = 2 + 2 * i * sizeof(long) + 1;
197
198         mutex_unlock(&ap_perms_mutex);
199
200         return rc;
201 }
202
203 static ssize_t ioctlmask_store(struct device *dev,
204                                struct device_attribute *attr,
205                                const char *buf, size_t count)
206 {
207         int rc;
208         struct zcdn_device *zcdndev = to_zcdn_dev(dev);
209
210         rc = ap_parse_mask_str(buf, zcdndev->perms.ioctlm,
211                                AP_IOCTLS, &ap_perms_mutex);
212         if (rc)
213                 return rc;
214
215         return count;
216 }
217
218 static DEVICE_ATTR_RW(ioctlmask);
219
220 static ssize_t apmask_show(struct device *dev,
221                            struct device_attribute *attr,
222                            char *buf)
223 {
224         int i, rc;
225         struct zcdn_device *zcdndev = to_zcdn_dev(dev);
226
227         if (mutex_lock_interruptible(&ap_perms_mutex))
228                 return -ERESTARTSYS;
229
230         buf[0] = '0';
231         buf[1] = 'x';
232         for (i = 0; i < sizeof(zcdndev->perms.apm) / sizeof(long); i++)
233                 snprintf(buf + 2 + 2 * i * sizeof(long),
234                          PAGE_SIZE - 2 - 2 * i * sizeof(long),
235                          "%016lx", zcdndev->perms.apm[i]);
236         buf[2 + 2 * i * sizeof(long)] = '\n';
237         buf[2 + 2 * i * sizeof(long) + 1] = '\0';
238         rc = 2 + 2 * i * sizeof(long) + 1;
239
240         mutex_unlock(&ap_perms_mutex);
241
242         return rc;
243 }
244
245 static ssize_t apmask_store(struct device *dev,
246                             struct device_attribute *attr,
247                             const char *buf, size_t count)
248 {
249         int rc;
250         struct zcdn_device *zcdndev = to_zcdn_dev(dev);
251
252         rc = ap_parse_mask_str(buf, zcdndev->perms.apm,
253                                AP_DEVICES, &ap_perms_mutex);
254         if (rc)
255                 return rc;
256
257         return count;
258 }
259
260 static DEVICE_ATTR_RW(apmask);
261
262 static ssize_t aqmask_show(struct device *dev,
263                            struct device_attribute *attr,
264                            char *buf)
265 {
266         int i, rc;
267         struct zcdn_device *zcdndev = to_zcdn_dev(dev);
268
269         if (mutex_lock_interruptible(&ap_perms_mutex))
270                 return -ERESTARTSYS;
271
272         buf[0] = '0';
273         buf[1] = 'x';
274         for (i = 0; i < sizeof(zcdndev->perms.aqm) / sizeof(long); i++)
275                 snprintf(buf + 2 + 2 * i * sizeof(long),
276                          PAGE_SIZE - 2 - 2 * i * sizeof(long),
277                          "%016lx", zcdndev->perms.aqm[i]);
278         buf[2 + 2 * i * sizeof(long)] = '\n';
279         buf[2 + 2 * i * sizeof(long) + 1] = '\0';
280         rc = 2 + 2 * i * sizeof(long) + 1;
281
282         mutex_unlock(&ap_perms_mutex);
283
284         return rc;
285 }
286
287 static ssize_t aqmask_store(struct device *dev,
288                             struct device_attribute *attr,
289                             const char *buf, size_t count)
290 {
291         int rc;
292         struct zcdn_device *zcdndev = to_zcdn_dev(dev);
293
294         rc = ap_parse_mask_str(buf, zcdndev->perms.aqm,
295                                AP_DOMAINS, &ap_perms_mutex);
296         if (rc)
297                 return rc;
298
299         return count;
300 }
301
302 static DEVICE_ATTR_RW(aqmask);
303
304 static struct attribute *zcdn_dev_attrs[] = {
305         &dev_attr_ioctlmask.attr,
306         &dev_attr_apmask.attr,
307         &dev_attr_aqmask.attr,
308         NULL
309 };
310
311 static struct attribute_group zcdn_dev_attr_group = {
312         .attrs = zcdn_dev_attrs
313 };
314
315 static const struct attribute_group *zcdn_dev_attr_groups[] = {
316         &zcdn_dev_attr_group,
317         NULL
318 };
319
320 static ssize_t zcdn_create_store(struct class *class,
321                                  struct class_attribute *attr,
322                                  const char *buf, size_t count)
323 {
324         int rc;
325         char name[ZCDN_MAX_NAME];
326
327         strncpy(name, skip_spaces(buf), sizeof(name));
328         name[sizeof(name) - 1] = '\0';
329
330         rc = zcdn_create(strim(name));
331
332         return rc ? rc : count;
333 }
334
335 static const struct class_attribute class_attr_zcdn_create =
336         __ATTR(create, 0600, NULL, zcdn_create_store);
337
338 static ssize_t zcdn_destroy_store(struct class *class,
339                                   struct class_attribute *attr,
340                                   const char *buf, size_t count)
341 {
342         int rc;
343         char name[ZCDN_MAX_NAME];
344
345         strncpy(name, skip_spaces(buf), sizeof(name));
346         name[sizeof(name) - 1] = '\0';
347
348         rc = zcdn_destroy(strim(name));
349
350         return rc ? rc : count;
351 }
352
353 static const struct class_attribute class_attr_zcdn_destroy =
354         __ATTR(destroy, 0600, NULL, zcdn_destroy_store);
355
356 static void zcdn_device_release(struct device *dev)
357 {
358         struct zcdn_device *zcdndev = to_zcdn_dev(dev);
359
360         ZCRYPT_DBF(DBF_INFO, "releasing zcdn device %d:%d\n",
361                    MAJOR(dev->devt), MINOR(dev->devt));
362
363         kfree(zcdndev);
364 }
365
366 static int zcdn_create(const char *name)
367 {
368         dev_t devt;
369         int i, rc = 0;
370         char nodename[ZCDN_MAX_NAME];
371         struct zcdn_device *zcdndev;
372
373         if (mutex_lock_interruptible(&ap_perms_mutex))
374                 return -ERESTARTSYS;
375
376         /* check if device node with this name already exists */
377         if (name[0]) {
378                 zcdndev = find_zcdndev_by_name(name);
379                 if (zcdndev) {
380                         put_device(&zcdndev->device);
381                         rc = -EEXIST;
382                         goto unlockout;
383                 }
384         }
385
386         /* find an unused minor number */
387         for (i = 0; i < ZCRYPT_MAX_MINOR_NODES; i++) {
388                 devt = MKDEV(MAJOR(zcrypt_devt), MINOR(zcrypt_devt) + i);
389                 zcdndev = find_zcdndev_by_devt(devt);
390                 if (zcdndev)
391                         put_device(&zcdndev->device);
392                 else
393                         break;
394         }
395         if (i == ZCRYPT_MAX_MINOR_NODES) {
396                 rc = -ENOSPC;
397                 goto unlockout;
398         }
399
400         /* alloc and prepare a new zcdn device */
401         zcdndev = kzalloc(sizeof(*zcdndev), GFP_KERNEL);
402         if (!zcdndev) {
403                 rc = -ENOMEM;
404                 goto unlockout;
405         }
406         zcdndev->device.release = zcdn_device_release;
407         zcdndev->device.class = zcrypt_class;
408         zcdndev->device.devt = devt;
409         zcdndev->device.groups = zcdn_dev_attr_groups;
410         if (name[0])
411                 strncpy(nodename, name, sizeof(nodename));
412         else
413                 snprintf(nodename, sizeof(nodename),
414                          ZCRYPT_NAME "_%d", (int) MINOR(devt));
415         nodename[sizeof(nodename)-1] = '\0';
416         if (dev_set_name(&zcdndev->device, nodename)) {
417                 rc = -EINVAL;
418                 goto unlockout;
419         }
420         rc = device_register(&zcdndev->device);
421         if (rc) {
422                 put_device(&zcdndev->device);
423                 goto unlockout;
424         }
425
426         ZCRYPT_DBF(DBF_INFO, "created zcdn device %d:%d\n",
427                    MAJOR(devt), MINOR(devt));
428
429 unlockout:
430         mutex_unlock(&ap_perms_mutex);
431         return rc;
432 }
433
434 static int zcdn_destroy(const char *name)
435 {
436         int rc = 0;
437         struct zcdn_device *zcdndev;
438
439         if (mutex_lock_interruptible(&ap_perms_mutex))
440                 return -ERESTARTSYS;
441
442         /* try to find this zcdn device */
443         zcdndev = find_zcdndev_by_name(name);
444         if (!zcdndev) {
445                 rc = -ENOENT;
446                 goto unlockout;
447         }
448
449         /*
450          * The zcdn device is not hard destroyed. It is subject to
451          * reference counting and thus just needs to be unregistered.
452          */
453         put_device(&zcdndev->device);
454         device_unregister(&zcdndev->device);
455
456 unlockout:
457         mutex_unlock(&ap_perms_mutex);
458         return rc;
459 }
460
461 static void zcdn_destroy_all(void)
462 {
463         int i;
464         dev_t devt;
465         struct zcdn_device *zcdndev;
466
467         mutex_lock(&ap_perms_mutex);
468         for (i = 0; i < ZCRYPT_MAX_MINOR_NODES; i++) {
469                 devt = MKDEV(MAJOR(zcrypt_devt), MINOR(zcrypt_devt) + i);
470                 zcdndev = find_zcdndev_by_devt(devt);
471                 if (zcdndev) {
472                         put_device(&zcdndev->device);
473                         device_unregister(&zcdndev->device);
474                 }
475         }
476         mutex_unlock(&ap_perms_mutex);
477 }
478
479 #endif
480
481 /**
482  * zcrypt_read (): Not supported beyond zcrypt 1.3.1.
483  *
484  * This function is not supported beyond zcrypt 1.3.1.
485  */
486 static ssize_t zcrypt_read(struct file *filp, char __user *buf,
487                            size_t count, loff_t *f_pos)
488 {
489         return -EPERM;
490 }
491
492 /**
493  * zcrypt_write(): Not allowed.
494  *
495  * Write is is not allowed
496  */
497 static ssize_t zcrypt_write(struct file *filp, const char __user *buf,
498                             size_t count, loff_t *f_pos)
499 {
500         return -EPERM;
501 }
502
503 /**
504  * zcrypt_open(): Count number of users.
505  *
506  * Device open function to count number of users.
507  */
508 static int zcrypt_open(struct inode *inode, struct file *filp)
509 {
510         struct ap_perms *perms = &ap_perms;
511
512 #ifdef CONFIG_ZCRYPT_MULTIDEVNODES
513         if (filp->f_inode->i_cdev == &zcrypt_cdev) {
514                 struct zcdn_device *zcdndev;
515
516                 if (mutex_lock_interruptible(&ap_perms_mutex))
517                         return -ERESTARTSYS;
518                 zcdndev = find_zcdndev_by_devt(filp->f_inode->i_rdev);
519                 /* find returns a reference, no get_device() needed */
520                 mutex_unlock(&ap_perms_mutex);
521                 if (zcdndev)
522                         perms = &zcdndev->perms;
523         }
524 #endif
525         filp->private_data = (void *) perms;
526
527         atomic_inc(&zcrypt_open_count);
528         return nonseekable_open(inode, filp);
529 }
530
531 /**
532  * zcrypt_release(): Count number of users.
533  *
534  * Device close function to count number of users.
535  */
536 static int zcrypt_release(struct inode *inode, struct file *filp)
537 {
538 #ifdef CONFIG_ZCRYPT_MULTIDEVNODES
539         if (filp->f_inode->i_cdev == &zcrypt_cdev) {
540                 struct zcdn_device *zcdndev;
541
542                 if (mutex_lock_interruptible(&ap_perms_mutex))
543                         return -ERESTARTSYS;
544                 zcdndev = find_zcdndev_by_devt(filp->f_inode->i_rdev);
545                 mutex_unlock(&ap_perms_mutex);
546                 if (zcdndev) {
547                         /* 2 puts here: one for find, one for open */
548                         put_device(&zcdndev->device);
549                         put_device(&zcdndev->device);
550                 }
551         }
552 #endif
553
554         atomic_dec(&zcrypt_open_count);
555         return 0;
556 }
557
558 static inline int zcrypt_check_ioctl(struct ap_perms *perms,
559                                      unsigned int cmd)
560 {
561         int rc = -EPERM;
562         int ioctlnr = (cmd & _IOC_NRMASK) >> _IOC_NRSHIFT;
563
564         if (ioctlnr > 0 && ioctlnr < AP_IOCTLS) {
565                 if (test_bit_inv(ioctlnr, perms->ioctlm))
566                         rc = 0;
567         }
568
569         if (rc)
570                 ZCRYPT_DBF(DBF_WARN,
571                            "ioctl check failed: ioctlnr=0x%04x rc=%d\n",
572                            ioctlnr, rc);
573
574         return rc;
575 }
576
577 static inline bool zcrypt_check_card(struct ap_perms *perms, int card)
578 {
579         return test_bit_inv(card, perms->apm) ? true : false;
580 }
581
582 static inline bool zcrypt_check_queue(struct ap_perms *perms, int queue)
583 {
584         return test_bit_inv(queue, perms->aqm) ? true : false;
585 }
586
587 static inline struct zcrypt_queue *zcrypt_pick_queue(struct zcrypt_card *zc,
588                                                      struct zcrypt_queue *zq,
589                                                      struct module **pmod,
590                                                      unsigned int weight)
591 {
592         if (!zq || !try_module_get(zq->queue->ap_dev.drv->driver.owner))
593                 return NULL;
594         zcrypt_queue_get(zq);
595         get_device(&zq->queue->ap_dev.device);
596         atomic_add(weight, &zc->load);
597         atomic_add(weight, &zq->load);
598         zq->request_count++;
599         *pmod = zq->queue->ap_dev.drv->driver.owner;
600         return zq;
601 }
602
603 static inline void zcrypt_drop_queue(struct zcrypt_card *zc,
604                                      struct zcrypt_queue *zq,
605                                      struct module *mod,
606                                      unsigned int weight)
607 {
608         zq->request_count--;
609         atomic_sub(weight, &zc->load);
610         atomic_sub(weight, &zq->load);
611         put_device(&zq->queue->ap_dev.device);
612         zcrypt_queue_put(zq);
613         module_put(mod);
614 }
615
616 static inline bool zcrypt_card_compare(struct zcrypt_card *zc,
617                                        struct zcrypt_card *pref_zc,
618                                        unsigned int weight,
619                                        unsigned int pref_weight)
620 {
621         if (!pref_zc)
622                 return false;
623         weight += atomic_read(&zc->load);
624         pref_weight += atomic_read(&pref_zc->load);
625         if (weight == pref_weight)
626                 return atomic_read(&zc->card->total_request_count) >
627                         atomic_read(&pref_zc->card->total_request_count);
628         return weight > pref_weight;
629 }
630
631 static inline bool zcrypt_queue_compare(struct zcrypt_queue *zq,
632                                         struct zcrypt_queue *pref_zq,
633                                         unsigned int weight,
634                                         unsigned int pref_weight)
635 {
636         if (!pref_zq)
637                 return false;
638         weight += atomic_read(&zq->load);
639         pref_weight += atomic_read(&pref_zq->load);
640         if (weight == pref_weight)
641                 return zq->queue->total_request_count >
642                         pref_zq->queue->total_request_count;
643         return weight > pref_weight;
644 }
645
646 /*
647  * zcrypt ioctls.
648  */
649 static long zcrypt_rsa_modexpo(struct ap_perms *perms,
650                                struct ica_rsa_modexpo *mex)
651 {
652         struct zcrypt_card *zc, *pref_zc;
653         struct zcrypt_queue *zq, *pref_zq;
654         unsigned int weight, pref_weight;
655         unsigned int func_code;
656         int qid = 0, rc = -ENODEV;
657         struct module *mod;
658
659         trace_s390_zcrypt_req(mex, TP_ICARSAMODEXPO);
660
661         if (mex->outputdatalength < mex->inputdatalength) {
662                 rc = -EINVAL;
663                 goto out;
664         }
665
666         /*
667          * As long as outputdatalength is big enough, we can set the
668          * outputdatalength equal to the inputdatalength, since that is the
669          * number of bytes we will copy in any case
670          */
671         mex->outputdatalength = mex->inputdatalength;
672
673         rc = get_rsa_modex_fc(mex, &func_code);
674         if (rc)
675                 goto out;
676
677         pref_zc = NULL;
678         pref_zq = NULL;
679         spin_lock(&zcrypt_list_lock);
680         for_each_zcrypt_card(zc) {
681                 /* Check for online accelarator and CCA cards */
682                 if (!zc->online || !(zc->card->functions & 0x18000000))
683                         continue;
684                 /* Check for size limits */
685                 if (zc->min_mod_size > mex->inputdatalength ||
686                     zc->max_mod_size < mex->inputdatalength)
687                         continue;
688                 /* check if device node has admission for this card */
689                 if (!zcrypt_check_card(perms, zc->card->id))
690                         continue;
691                 /* get weight index of the card device  */
692                 weight = zc->speed_rating[func_code];
693                 if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
694                         continue;
695                 for_each_zcrypt_queue(zq, zc) {
696                         /* check if device is online and eligible */
697                         if (!zq->online || !zq->ops->rsa_modexpo)
698                                 continue;
699                         /* check if device node has admission for this queue */
700                         if (!zcrypt_check_queue(perms,
701                                                 AP_QID_QUEUE(zq->queue->qid)))
702                                 continue;
703                         if (zcrypt_queue_compare(zq, pref_zq,
704                                                  weight, pref_weight))
705                                 continue;
706                         pref_zc = zc;
707                         pref_zq = zq;
708                         pref_weight = weight;
709                 }
710         }
711         pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, weight);
712         spin_unlock(&zcrypt_list_lock);
713
714         if (!pref_zq) {
715                 rc = -ENODEV;
716                 goto out;
717         }
718
719         qid = pref_zq->queue->qid;
720         rc = pref_zq->ops->rsa_modexpo(pref_zq, mex);
721
722         spin_lock(&zcrypt_list_lock);
723         zcrypt_drop_queue(pref_zc, pref_zq, mod, weight);
724         spin_unlock(&zcrypt_list_lock);
725
726 out:
727         trace_s390_zcrypt_rep(mex, func_code, rc,
728                               AP_QID_CARD(qid), AP_QID_QUEUE(qid));
729         return rc;
730 }
731
732 static long zcrypt_rsa_crt(struct ap_perms *perms,
733                            struct ica_rsa_modexpo_crt *crt)
734 {
735         struct zcrypt_card *zc, *pref_zc;
736         struct zcrypt_queue *zq, *pref_zq;
737         unsigned int weight, pref_weight;
738         unsigned int func_code;
739         int qid = 0, rc = -ENODEV;
740         struct module *mod;
741
742         trace_s390_zcrypt_req(crt, TP_ICARSACRT);
743
744         if (crt->outputdatalength < crt->inputdatalength) {
745                 rc = -EINVAL;
746                 goto out;
747         }
748
749         /*
750          * As long as outputdatalength is big enough, we can set the
751          * outputdatalength equal to the inputdatalength, since that is the
752          * number of bytes we will copy in any case
753          */
754         crt->outputdatalength = crt->inputdatalength;
755
756         rc = get_rsa_crt_fc(crt, &func_code);
757         if (rc)
758                 goto out;
759
760         pref_zc = NULL;
761         pref_zq = NULL;
762         spin_lock(&zcrypt_list_lock);
763         for_each_zcrypt_card(zc) {
764                 /* Check for online accelarator and CCA cards */
765                 if (!zc->online || !(zc->card->functions & 0x18000000))
766                         continue;
767                 /* Check for size limits */
768                 if (zc->min_mod_size > crt->inputdatalength ||
769                     zc->max_mod_size < crt->inputdatalength)
770                         continue;
771                 /* check if device node has admission for this card */
772                 if (!zcrypt_check_card(perms, zc->card->id))
773                         continue;
774                 /* get weight index of the card device  */
775                 weight = zc->speed_rating[func_code];
776                 if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
777                         continue;
778                 for_each_zcrypt_queue(zq, zc) {
779                         /* check if device is online and eligible */
780                         if (!zq->online || !zq->ops->rsa_modexpo_crt)
781                                 continue;
782                         /* check if device node has admission for this queue */
783                         if (!zcrypt_check_queue(perms,
784                                                 AP_QID_QUEUE(zq->queue->qid)))
785                                 continue;
786                         if (zcrypt_queue_compare(zq, pref_zq,
787                                                  weight, pref_weight))
788                                 continue;
789                         pref_zc = zc;
790                         pref_zq = zq;
791                         pref_weight = weight;
792                 }
793         }
794         pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, weight);
795         spin_unlock(&zcrypt_list_lock);
796
797         if (!pref_zq) {
798                 rc = -ENODEV;
799                 goto out;
800         }
801
802         qid = pref_zq->queue->qid;
803         rc = pref_zq->ops->rsa_modexpo_crt(pref_zq, crt);
804
805         spin_lock(&zcrypt_list_lock);
806         zcrypt_drop_queue(pref_zc, pref_zq, mod, weight);
807         spin_unlock(&zcrypt_list_lock);
808
809 out:
810         trace_s390_zcrypt_rep(crt, func_code, rc,
811                               AP_QID_CARD(qid), AP_QID_QUEUE(qid));
812         return rc;
813 }
814
815 static long _zcrypt_send_cprb(struct ap_perms *perms,
816                               struct ica_xcRB *xcRB)
817 {
818         struct zcrypt_card *zc, *pref_zc;
819         struct zcrypt_queue *zq, *pref_zq;
820         struct ap_message ap_msg;
821         unsigned int weight, pref_weight;
822         unsigned int func_code;
823         unsigned short *domain;
824         int qid = 0, rc = -ENODEV;
825         struct module *mod;
826
827         trace_s390_zcrypt_req(xcRB, TB_ZSECSENDCPRB);
828
829         xcRB->status = 0;
830         ap_init_message(&ap_msg);
831         rc = get_cprb_fc(xcRB, &ap_msg, &func_code, &domain);
832         if (rc)
833                 goto out;
834
835         pref_zc = NULL;
836         pref_zq = NULL;
837         spin_lock(&zcrypt_list_lock);
838         for_each_zcrypt_card(zc) {
839                 /* Check for online CCA cards */
840                 if (!zc->online || !(zc->card->functions & 0x10000000))
841                         continue;
842                 /* Check for user selected CCA card */
843                 if (xcRB->user_defined != AUTOSELECT &&
844                     xcRB->user_defined != zc->card->id)
845                         continue;
846                 /* check if device node has admission for this card */
847                 if (!zcrypt_check_card(perms, zc->card->id))
848                         continue;
849                 /* get weight index of the card device  */
850                 weight = speed_idx_cca(func_code) * zc->speed_rating[SECKEY];
851                 if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
852                         continue;
853                 for_each_zcrypt_queue(zq, zc) {
854                         /* check if device is online and eligible */
855                         if (!zq->online ||
856                             !zq->ops->send_cprb ||
857                             ((*domain != (unsigned short) AUTOSELECT) &&
858                              (*domain != AP_QID_QUEUE(zq->queue->qid))))
859                                 continue;
860                         /* check if device node has admission for this queue */
861                         if (!zcrypt_check_queue(perms,
862                                                 AP_QID_QUEUE(zq->queue->qid)))
863                                 continue;
864                         if (zcrypt_queue_compare(zq, pref_zq,
865                                                  weight, pref_weight))
866                                 continue;
867                         pref_zc = zc;
868                         pref_zq = zq;
869                         pref_weight = weight;
870                 }
871         }
872         pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, weight);
873         spin_unlock(&zcrypt_list_lock);
874
875         if (!pref_zq) {
876                 rc = -ENODEV;
877                 goto out;
878         }
879
880         /* in case of auto select, provide the correct domain */
881         qid = pref_zq->queue->qid;
882         if (*domain == (unsigned short) AUTOSELECT)
883                 *domain = AP_QID_QUEUE(qid);
884
885         rc = pref_zq->ops->send_cprb(pref_zq, xcRB, &ap_msg);
886
887         spin_lock(&zcrypt_list_lock);
888         zcrypt_drop_queue(pref_zc, pref_zq, mod, weight);
889         spin_unlock(&zcrypt_list_lock);
890
891 out:
892         ap_release_message(&ap_msg);
893         trace_s390_zcrypt_rep(xcRB, func_code, rc,
894                               AP_QID_CARD(qid), AP_QID_QUEUE(qid));
895         return rc;
896 }
897
898 long zcrypt_send_cprb(struct ica_xcRB *xcRB)
899 {
900         return _zcrypt_send_cprb(&ap_perms, xcRB);
901 }
902 EXPORT_SYMBOL(zcrypt_send_cprb);
903
904 static bool is_desired_ep11_card(unsigned int dev_id,
905                                  unsigned short target_num,
906                                  struct ep11_target_dev *targets)
907 {
908         while (target_num-- > 0) {
909                 if (dev_id == targets->ap_id)
910                         return true;
911                 targets++;
912         }
913         return false;
914 }
915
916 static bool is_desired_ep11_queue(unsigned int dev_qid,
917                                   unsigned short target_num,
918                                   struct ep11_target_dev *targets)
919 {
920         while (target_num-- > 0) {
921                 if (AP_MKQID(targets->ap_id, targets->dom_id) == dev_qid)
922                         return true;
923                 targets++;
924         }
925         return false;
926 }
927
928 static long zcrypt_send_ep11_cprb(struct ap_perms *perms,
929                                   struct ep11_urb *xcrb)
930 {
931         struct zcrypt_card *zc, *pref_zc;
932         struct zcrypt_queue *zq, *pref_zq;
933         struct ep11_target_dev *targets;
934         unsigned short target_num;
935         unsigned int weight, pref_weight;
936         unsigned int func_code;
937         struct ap_message ap_msg;
938         int qid = 0, rc = -ENODEV;
939         struct module *mod;
940
941         trace_s390_zcrypt_req(xcrb, TP_ZSENDEP11CPRB);
942
943         ap_init_message(&ap_msg);
944
945         target_num = (unsigned short) xcrb->targets_num;
946
947         /* empty list indicates autoselect (all available targets) */
948         targets = NULL;
949         if (target_num != 0) {
950                 struct ep11_target_dev __user *uptr;
951
952                 targets = kcalloc(target_num, sizeof(*targets), GFP_KERNEL);
953                 if (!targets) {
954                         rc = -ENOMEM;
955                         goto out;
956                 }
957
958                 uptr = (struct ep11_target_dev __force __user *) xcrb->targets;
959                 if (copy_from_user(targets, uptr,
960                                    target_num * sizeof(*targets))) {
961                         rc = -EFAULT;
962                         goto out_free;
963                 }
964         }
965
966         rc = get_ep11cprb_fc(xcrb, &ap_msg, &func_code);
967         if (rc)
968                 goto out_free;
969
970         pref_zc = NULL;
971         pref_zq = NULL;
972         spin_lock(&zcrypt_list_lock);
973         for_each_zcrypt_card(zc) {
974                 /* Check for online EP11 cards */
975                 if (!zc->online || !(zc->card->functions & 0x04000000))
976                         continue;
977                 /* Check for user selected EP11 card */
978                 if (targets &&
979                     !is_desired_ep11_card(zc->card->id, target_num, targets))
980                         continue;
981                 /* check if device node has admission for this card */
982                 if (!zcrypt_check_card(perms, zc->card->id))
983                         continue;
984                 /* get weight index of the card device  */
985                 weight = speed_idx_ep11(func_code) * zc->speed_rating[SECKEY];
986                 if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
987                         continue;
988                 for_each_zcrypt_queue(zq, zc) {
989                         /* check if device is online and eligible */
990                         if (!zq->online ||
991                             !zq->ops->send_ep11_cprb ||
992                             (targets &&
993                              !is_desired_ep11_queue(zq->queue->qid,
994                                                     target_num, targets)))
995                                 continue;
996                         /* check if device node has admission for this queue */
997                         if (!zcrypt_check_queue(perms,
998                                                 AP_QID_QUEUE(zq->queue->qid)))
999                                 continue;
1000                         if (zcrypt_queue_compare(zq, pref_zq,
1001                                                  weight, pref_weight))
1002                                 continue;
1003                         pref_zc = zc;
1004                         pref_zq = zq;
1005                         pref_weight = weight;
1006                 }
1007         }
1008         pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, weight);
1009         spin_unlock(&zcrypt_list_lock);
1010
1011         if (!pref_zq) {
1012                 rc = -ENODEV;
1013                 goto out_free;
1014         }
1015
1016         qid = pref_zq->queue->qid;
1017         rc = pref_zq->ops->send_ep11_cprb(pref_zq, xcrb, &ap_msg);
1018
1019         spin_lock(&zcrypt_list_lock);
1020         zcrypt_drop_queue(pref_zc, pref_zq, mod, weight);
1021         spin_unlock(&zcrypt_list_lock);
1022
1023 out_free:
1024         kfree(targets);
1025 out:
1026         ap_release_message(&ap_msg);
1027         trace_s390_zcrypt_rep(xcrb, func_code, rc,
1028                               AP_QID_CARD(qid), AP_QID_QUEUE(qid));
1029         return rc;
1030 }
1031
1032 static long zcrypt_rng(char *buffer)
1033 {
1034         struct zcrypt_card *zc, *pref_zc;
1035         struct zcrypt_queue *zq, *pref_zq;
1036         unsigned int weight, pref_weight;
1037         unsigned int func_code;
1038         struct ap_message ap_msg;
1039         unsigned int domain;
1040         int qid = 0, rc = -ENODEV;
1041         struct module *mod;
1042
1043         trace_s390_zcrypt_req(buffer, TP_HWRNGCPRB);
1044
1045         ap_init_message(&ap_msg);
1046         rc = get_rng_fc(&ap_msg, &func_code, &domain);
1047         if (rc)
1048                 goto out;
1049
1050         pref_zc = NULL;
1051         pref_zq = NULL;
1052         spin_lock(&zcrypt_list_lock);
1053         for_each_zcrypt_card(zc) {
1054                 /* Check for online CCA cards */
1055                 if (!zc->online || !(zc->card->functions & 0x10000000))
1056                         continue;
1057                 /* get weight index of the card device  */
1058                 weight = zc->speed_rating[func_code];
1059                 if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight))
1060                         continue;
1061                 for_each_zcrypt_queue(zq, zc) {
1062                         /* check if device is online and eligible */
1063                         if (!zq->online || !zq->ops->rng)
1064                                 continue;
1065                         if (zcrypt_queue_compare(zq, pref_zq,
1066                                                  weight, pref_weight))
1067                                 continue;
1068                         pref_zc = zc;
1069                         pref_zq = zq;
1070                         pref_weight = weight;
1071                 }
1072         }
1073         pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, &mod, weight);
1074         spin_unlock(&zcrypt_list_lock);
1075
1076         if (!pref_zq) {
1077                 rc = -ENODEV;
1078                 goto out;
1079         }
1080
1081         qid = pref_zq->queue->qid;
1082         rc = pref_zq->ops->rng(pref_zq, buffer, &ap_msg);
1083
1084         spin_lock(&zcrypt_list_lock);
1085         zcrypt_drop_queue(pref_zc, pref_zq, mod, weight);
1086         spin_unlock(&zcrypt_list_lock);
1087
1088 out:
1089         ap_release_message(&ap_msg);
1090         trace_s390_zcrypt_rep(buffer, func_code, rc,
1091                               AP_QID_CARD(qid), AP_QID_QUEUE(qid));
1092         return rc;
1093 }
1094
1095 static void zcrypt_device_status_mask(struct zcrypt_device_status *devstatus)
1096 {
1097         struct zcrypt_card *zc;
1098         struct zcrypt_queue *zq;
1099         struct zcrypt_device_status *stat;
1100         int card, queue;
1101
1102         memset(devstatus, 0, MAX_ZDEV_ENTRIES
1103                * sizeof(struct zcrypt_device_status));
1104
1105         spin_lock(&zcrypt_list_lock);
1106         for_each_zcrypt_card(zc) {
1107                 for_each_zcrypt_queue(zq, zc) {
1108                         card = AP_QID_CARD(zq->queue->qid);
1109                         if (card >= MAX_ZDEV_CARDIDS)
1110                                 continue;
1111                         queue = AP_QID_QUEUE(zq->queue->qid);
1112                         stat = &devstatus[card * AP_DOMAINS + queue];
1113                         stat->hwtype = zc->card->ap_dev.device_type;
1114                         stat->functions = zc->card->functions >> 26;
1115                         stat->qid = zq->queue->qid;
1116                         stat->online = zq->online ? 0x01 : 0x00;
1117                 }
1118         }
1119         spin_unlock(&zcrypt_list_lock);
1120 }
1121
1122 void zcrypt_device_status_mask_ext(struct zcrypt_device_status_ext *devstatus)
1123 {
1124         struct zcrypt_card *zc;
1125         struct zcrypt_queue *zq;
1126         struct zcrypt_device_status_ext *stat;
1127         int card, queue;
1128
1129         memset(devstatus, 0, MAX_ZDEV_ENTRIES_EXT
1130                * sizeof(struct zcrypt_device_status_ext));
1131
1132         spin_lock(&zcrypt_list_lock);
1133         for_each_zcrypt_card(zc) {
1134                 for_each_zcrypt_queue(zq, zc) {
1135                         card = AP_QID_CARD(zq->queue->qid);
1136                         queue = AP_QID_QUEUE(zq->queue->qid);
1137                         stat = &devstatus[card * AP_DOMAINS + queue];
1138                         stat->hwtype = zc->card->ap_dev.device_type;
1139                         stat->functions = zc->card->functions >> 26;
1140                         stat->qid = zq->queue->qid;
1141                         stat->online = zq->online ? 0x01 : 0x00;
1142                 }
1143         }
1144         spin_unlock(&zcrypt_list_lock);
1145 }
1146 EXPORT_SYMBOL(zcrypt_device_status_mask_ext);
1147
1148 static void zcrypt_status_mask(char status[], size_t max_adapters)
1149 {
1150         struct zcrypt_card *zc;
1151         struct zcrypt_queue *zq;
1152         int card;
1153
1154         memset(status, 0, max_adapters);
1155         spin_lock(&zcrypt_list_lock);
1156         for_each_zcrypt_card(zc) {
1157                 for_each_zcrypt_queue(zq, zc) {
1158                         card = AP_QID_CARD(zq->queue->qid);
1159                         if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index
1160                             || card >= max_adapters)
1161                                 continue;
1162                         status[card] = zc->online ? zc->user_space_type : 0x0d;
1163                 }
1164         }
1165         spin_unlock(&zcrypt_list_lock);
1166 }
1167
1168 static void zcrypt_qdepth_mask(char qdepth[], size_t max_adapters)
1169 {
1170         struct zcrypt_card *zc;
1171         struct zcrypt_queue *zq;
1172         int card;
1173
1174         memset(qdepth, 0, max_adapters);
1175         spin_lock(&zcrypt_list_lock);
1176         local_bh_disable();
1177         for_each_zcrypt_card(zc) {
1178                 for_each_zcrypt_queue(zq, zc) {
1179                         card = AP_QID_CARD(zq->queue->qid);
1180                         if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index
1181                             || card >= max_adapters)
1182                                 continue;
1183                         spin_lock(&zq->queue->lock);
1184                         qdepth[card] =
1185                                 zq->queue->pendingq_count +
1186                                 zq->queue->requestq_count;
1187                         spin_unlock(&zq->queue->lock);
1188                 }
1189         }
1190         local_bh_enable();
1191         spin_unlock(&zcrypt_list_lock);
1192 }
1193
1194 static void zcrypt_perdev_reqcnt(int reqcnt[], size_t max_adapters)
1195 {
1196         struct zcrypt_card *zc;
1197         struct zcrypt_queue *zq;
1198         int card;
1199
1200         memset(reqcnt, 0, sizeof(int) * max_adapters);
1201         spin_lock(&zcrypt_list_lock);
1202         local_bh_disable();
1203         for_each_zcrypt_card(zc) {
1204                 for_each_zcrypt_queue(zq, zc) {
1205                         card = AP_QID_CARD(zq->queue->qid);
1206                         if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index
1207                             || card >= max_adapters)
1208                                 continue;
1209                         spin_lock(&zq->queue->lock);
1210                         reqcnt[card] = zq->queue->total_request_count;
1211                         spin_unlock(&zq->queue->lock);
1212                 }
1213         }
1214         local_bh_enable();
1215         spin_unlock(&zcrypt_list_lock);
1216 }
1217
1218 static int zcrypt_pendingq_count(void)
1219 {
1220         struct zcrypt_card *zc;
1221         struct zcrypt_queue *zq;
1222         int pendingq_count;
1223
1224         pendingq_count = 0;
1225         spin_lock(&zcrypt_list_lock);
1226         local_bh_disable();
1227         for_each_zcrypt_card(zc) {
1228                 for_each_zcrypt_queue(zq, zc) {
1229                         if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index)
1230                                 continue;
1231                         spin_lock(&zq->queue->lock);
1232                         pendingq_count += zq->queue->pendingq_count;
1233                         spin_unlock(&zq->queue->lock);
1234                 }
1235         }
1236         local_bh_enable();
1237         spin_unlock(&zcrypt_list_lock);
1238         return pendingq_count;
1239 }
1240
1241 static int zcrypt_requestq_count(void)
1242 {
1243         struct zcrypt_card *zc;
1244         struct zcrypt_queue *zq;
1245         int requestq_count;
1246
1247         requestq_count = 0;
1248         spin_lock(&zcrypt_list_lock);
1249         local_bh_disable();
1250         for_each_zcrypt_card(zc) {
1251                 for_each_zcrypt_queue(zq, zc) {
1252                         if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index)
1253                                 continue;
1254                         spin_lock(&zq->queue->lock);
1255                         requestq_count += zq->queue->requestq_count;
1256                         spin_unlock(&zq->queue->lock);
1257                 }
1258         }
1259         local_bh_enable();
1260         spin_unlock(&zcrypt_list_lock);
1261         return requestq_count;
1262 }
1263
1264 static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
1265                                   unsigned long arg)
1266 {
1267         int rc;
1268         struct ap_perms *perms =
1269                 (struct ap_perms *) filp->private_data;
1270
1271         rc = zcrypt_check_ioctl(perms, cmd);
1272         if (rc)
1273                 return rc;
1274
1275         switch (cmd) {
1276         case ICARSAMODEXPO: {
1277                 struct ica_rsa_modexpo __user *umex = (void __user *) arg;
1278                 struct ica_rsa_modexpo mex;
1279
1280                 if (copy_from_user(&mex, umex, sizeof(mex)))
1281                         return -EFAULT;
1282                 do {
1283                         rc = zcrypt_rsa_modexpo(perms, &mex);
1284                 } while (rc == -EAGAIN);
1285                 /* on failure: retry once again after a requested rescan */
1286                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1287                         do {
1288                                 rc = zcrypt_rsa_modexpo(perms, &mex);
1289                         } while (rc == -EAGAIN);
1290                 if (rc) {
1291                         ZCRYPT_DBF(DBF_DEBUG, "ioctl ICARSAMODEXPO rc=%d\n", rc);
1292                         return rc;
1293                 }
1294                 return put_user(mex.outputdatalength, &umex->outputdatalength);
1295         }
1296         case ICARSACRT: {
1297                 struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg;
1298                 struct ica_rsa_modexpo_crt crt;
1299
1300                 if (copy_from_user(&crt, ucrt, sizeof(crt)))
1301                         return -EFAULT;
1302                 do {
1303                         rc = zcrypt_rsa_crt(perms, &crt);
1304                 } while (rc == -EAGAIN);
1305                 /* on failure: retry once again after a requested rescan */
1306                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1307                         do {
1308                                 rc = zcrypt_rsa_crt(perms, &crt);
1309                         } while (rc == -EAGAIN);
1310                 if (rc) {
1311                         ZCRYPT_DBF(DBF_DEBUG, "ioctl ICARSACRT rc=%d\n", rc);
1312                         return rc;
1313                 }
1314                 return put_user(crt.outputdatalength, &ucrt->outputdatalength);
1315         }
1316         case ZSECSENDCPRB: {
1317                 struct ica_xcRB __user *uxcRB = (void __user *) arg;
1318                 struct ica_xcRB xcRB;
1319
1320                 if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB)))
1321                         return -EFAULT;
1322                 do {
1323                         rc = _zcrypt_send_cprb(perms, &xcRB);
1324                 } while (rc == -EAGAIN);
1325                 /* on failure: retry once again after a requested rescan */
1326                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1327                         do {
1328                                 rc = _zcrypt_send_cprb(perms, &xcRB);
1329                         } while (rc == -EAGAIN);
1330                 if (rc)
1331                         ZCRYPT_DBF(DBF_DEBUG, "ioctl ZSENDCPRB rc=%d status=0x%x\n",
1332                                    rc, xcRB.status);
1333                 if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB)))
1334                         return -EFAULT;
1335                 return rc;
1336         }
1337         case ZSENDEP11CPRB: {
1338                 struct ep11_urb __user *uxcrb = (void __user *)arg;
1339                 struct ep11_urb xcrb;
1340
1341                 if (copy_from_user(&xcrb, uxcrb, sizeof(xcrb)))
1342                         return -EFAULT;
1343                 do {
1344                         rc = zcrypt_send_ep11_cprb(perms, &xcrb);
1345                 } while (rc == -EAGAIN);
1346                 /* on failure: retry once again after a requested rescan */
1347                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1348                         do {
1349                                 rc = zcrypt_send_ep11_cprb(perms, &xcrb);
1350                         } while (rc == -EAGAIN);
1351                 if (rc)
1352                         ZCRYPT_DBF(DBF_DEBUG, "ioctl ZSENDEP11CPRB rc=%d\n", rc);
1353                 if (copy_to_user(uxcrb, &xcrb, sizeof(xcrb)))
1354                         return -EFAULT;
1355                 return rc;
1356         }
1357         case ZCRYPT_DEVICE_STATUS: {
1358                 struct zcrypt_device_status_ext *device_status;
1359                 size_t total_size = MAX_ZDEV_ENTRIES_EXT
1360                         * sizeof(struct zcrypt_device_status_ext);
1361
1362                 device_status = kzalloc(total_size, GFP_KERNEL);
1363                 if (!device_status)
1364                         return -ENOMEM;
1365                 zcrypt_device_status_mask_ext(device_status);
1366                 if (copy_to_user((char __user *) arg, device_status,
1367                                  total_size))
1368                         rc = -EFAULT;
1369                 kfree(device_status);
1370                 return rc;
1371         }
1372         case ZCRYPT_STATUS_MASK: {
1373                 char status[AP_DEVICES];
1374
1375                 zcrypt_status_mask(status, AP_DEVICES);
1376                 if (copy_to_user((char __user *) arg, status, sizeof(status)))
1377                         return -EFAULT;
1378                 return 0;
1379         }
1380         case ZCRYPT_QDEPTH_MASK: {
1381                 char qdepth[AP_DEVICES];
1382
1383                 zcrypt_qdepth_mask(qdepth, AP_DEVICES);
1384                 if (copy_to_user((char __user *) arg, qdepth, sizeof(qdepth)))
1385                         return -EFAULT;
1386                 return 0;
1387         }
1388         case ZCRYPT_PERDEV_REQCNT: {
1389                 int *reqcnt;
1390
1391                 reqcnt = kcalloc(AP_DEVICES, sizeof(int), GFP_KERNEL);
1392                 if (!reqcnt)
1393                         return -ENOMEM;
1394                 zcrypt_perdev_reqcnt(reqcnt, AP_DEVICES);
1395                 if (copy_to_user((int __user *) arg, reqcnt, sizeof(reqcnt)))
1396                         rc = -EFAULT;
1397                 kfree(reqcnt);
1398                 return rc;
1399         }
1400         case Z90STAT_REQUESTQ_COUNT:
1401                 return put_user(zcrypt_requestq_count(), (int __user *) arg);
1402         case Z90STAT_PENDINGQ_COUNT:
1403                 return put_user(zcrypt_pendingq_count(), (int __user *) arg);
1404         case Z90STAT_TOTALOPEN_COUNT:
1405                 return put_user(atomic_read(&zcrypt_open_count),
1406                                 (int __user *) arg);
1407         case Z90STAT_DOMAIN_INDEX:
1408                 return put_user(ap_domain_index, (int __user *) arg);
1409         /*
1410          * Deprecated ioctls
1411          */
1412         case ZDEVICESTATUS: {
1413                 /* the old ioctl supports only 64 adapters */
1414                 struct zcrypt_device_status *device_status;
1415                 size_t total_size = MAX_ZDEV_ENTRIES
1416                         * sizeof(struct zcrypt_device_status);
1417
1418                 device_status = kzalloc(total_size, GFP_KERNEL);
1419                 if (!device_status)
1420                         return -ENOMEM;
1421                 zcrypt_device_status_mask(device_status);
1422                 if (copy_to_user((char __user *) arg, device_status,
1423                                  total_size))
1424                         rc = -EFAULT;
1425                 kfree(device_status);
1426                 return rc;
1427         }
1428         case Z90STAT_STATUS_MASK: {
1429                 /* the old ioctl supports only 64 adapters */
1430                 char status[MAX_ZDEV_CARDIDS];
1431
1432                 zcrypt_status_mask(status, MAX_ZDEV_CARDIDS);
1433                 if (copy_to_user((char __user *) arg, status, sizeof(status)))
1434                         return -EFAULT;
1435                 return 0;
1436         }
1437         case Z90STAT_QDEPTH_MASK: {
1438                 /* the old ioctl supports only 64 adapters */
1439                 char qdepth[MAX_ZDEV_CARDIDS];
1440
1441                 zcrypt_qdepth_mask(qdepth, MAX_ZDEV_CARDIDS);
1442                 if (copy_to_user((char __user *) arg, qdepth, sizeof(qdepth)))
1443                         return -EFAULT;
1444                 return 0;
1445         }
1446         case Z90STAT_PERDEV_REQCNT: {
1447                 /* the old ioctl supports only 64 adapters */
1448                 int reqcnt[MAX_ZDEV_CARDIDS];
1449
1450                 zcrypt_perdev_reqcnt(reqcnt, MAX_ZDEV_CARDIDS);
1451                 if (copy_to_user((int __user *) arg, reqcnt, sizeof(reqcnt)))
1452                         return -EFAULT;
1453                 return 0;
1454         }
1455         /* unknown ioctl number */
1456         default:
1457                 ZCRYPT_DBF(DBF_DEBUG, "unknown ioctl 0x%08x\n", cmd);
1458                 return -ENOIOCTLCMD;
1459         }
1460 }
1461
1462 #ifdef CONFIG_COMPAT
1463 /*
1464  * ioctl32 conversion routines
1465  */
1466 struct compat_ica_rsa_modexpo {
1467         compat_uptr_t   inputdata;
1468         unsigned int    inputdatalength;
1469         compat_uptr_t   outputdata;
1470         unsigned int    outputdatalength;
1471         compat_uptr_t   b_key;
1472         compat_uptr_t   n_modulus;
1473 };
1474
1475 static long trans_modexpo32(struct ap_perms *perms, struct file *filp,
1476                             unsigned int cmd, unsigned long arg)
1477 {
1478         struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg);
1479         struct compat_ica_rsa_modexpo mex32;
1480         struct ica_rsa_modexpo mex64;
1481         long rc;
1482
1483         if (copy_from_user(&mex32, umex32, sizeof(mex32)))
1484                 return -EFAULT;
1485         mex64.inputdata = compat_ptr(mex32.inputdata);
1486         mex64.inputdatalength = mex32.inputdatalength;
1487         mex64.outputdata = compat_ptr(mex32.outputdata);
1488         mex64.outputdatalength = mex32.outputdatalength;
1489         mex64.b_key = compat_ptr(mex32.b_key);
1490         mex64.n_modulus = compat_ptr(mex32.n_modulus);
1491         do {
1492                 rc = zcrypt_rsa_modexpo(perms, &mex64);
1493         } while (rc == -EAGAIN);
1494         /* on failure: retry once again after a requested rescan */
1495         if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1496                 do {
1497                         rc = zcrypt_rsa_modexpo(perms, &mex64);
1498                 } while (rc == -EAGAIN);
1499         if (rc)
1500                 return rc;
1501         return put_user(mex64.outputdatalength,
1502                         &umex32->outputdatalength);
1503 }
1504
1505 struct compat_ica_rsa_modexpo_crt {
1506         compat_uptr_t   inputdata;
1507         unsigned int    inputdatalength;
1508         compat_uptr_t   outputdata;
1509         unsigned int    outputdatalength;
1510         compat_uptr_t   bp_key;
1511         compat_uptr_t   bq_key;
1512         compat_uptr_t   np_prime;
1513         compat_uptr_t   nq_prime;
1514         compat_uptr_t   u_mult_inv;
1515 };
1516
1517 static long trans_modexpo_crt32(struct ap_perms *perms, struct file *filp,
1518                                 unsigned int cmd, unsigned long arg)
1519 {
1520         struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg);
1521         struct compat_ica_rsa_modexpo_crt crt32;
1522         struct ica_rsa_modexpo_crt crt64;
1523         long rc;
1524
1525         if (copy_from_user(&crt32, ucrt32, sizeof(crt32)))
1526                 return -EFAULT;
1527         crt64.inputdata = compat_ptr(crt32.inputdata);
1528         crt64.inputdatalength = crt32.inputdatalength;
1529         crt64.outputdata = compat_ptr(crt32.outputdata);
1530         crt64.outputdatalength = crt32.outputdatalength;
1531         crt64.bp_key = compat_ptr(crt32.bp_key);
1532         crt64.bq_key = compat_ptr(crt32.bq_key);
1533         crt64.np_prime = compat_ptr(crt32.np_prime);
1534         crt64.nq_prime = compat_ptr(crt32.nq_prime);
1535         crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv);
1536         do {
1537                 rc = zcrypt_rsa_crt(perms, &crt64);
1538         } while (rc == -EAGAIN);
1539         /* on failure: retry once again after a requested rescan */
1540         if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1541                 do {
1542                         rc = zcrypt_rsa_crt(perms, &crt64);
1543                 } while (rc == -EAGAIN);
1544         if (rc)
1545                 return rc;
1546         return put_user(crt64.outputdatalength,
1547                         &ucrt32->outputdatalength);
1548 }
1549
1550 struct compat_ica_xcRB {
1551         unsigned short  agent_ID;
1552         unsigned int    user_defined;
1553         unsigned short  request_ID;
1554         unsigned int    request_control_blk_length;
1555         unsigned char   padding1[16 - sizeof(compat_uptr_t)];
1556         compat_uptr_t   request_control_blk_addr;
1557         unsigned int    request_data_length;
1558         char            padding2[16 - sizeof(compat_uptr_t)];
1559         compat_uptr_t   request_data_address;
1560         unsigned int    reply_control_blk_length;
1561         char            padding3[16 - sizeof(compat_uptr_t)];
1562         compat_uptr_t   reply_control_blk_addr;
1563         unsigned int    reply_data_length;
1564         char            padding4[16 - sizeof(compat_uptr_t)];
1565         compat_uptr_t   reply_data_addr;
1566         unsigned short  priority_window;
1567         unsigned int    status;
1568 } __packed;
1569
1570 static long trans_xcRB32(struct ap_perms *perms, struct file *filp,
1571                          unsigned int cmd, unsigned long arg)
1572 {
1573         struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg);
1574         struct compat_ica_xcRB xcRB32;
1575         struct ica_xcRB xcRB64;
1576         long rc;
1577
1578         if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32)))
1579                 return -EFAULT;
1580         xcRB64.agent_ID = xcRB32.agent_ID;
1581         xcRB64.user_defined = xcRB32.user_defined;
1582         xcRB64.request_ID = xcRB32.request_ID;
1583         xcRB64.request_control_blk_length =
1584                 xcRB32.request_control_blk_length;
1585         xcRB64.request_control_blk_addr =
1586                 compat_ptr(xcRB32.request_control_blk_addr);
1587         xcRB64.request_data_length =
1588                 xcRB32.request_data_length;
1589         xcRB64.request_data_address =
1590                 compat_ptr(xcRB32.request_data_address);
1591         xcRB64.reply_control_blk_length =
1592                 xcRB32.reply_control_blk_length;
1593         xcRB64.reply_control_blk_addr =
1594                 compat_ptr(xcRB32.reply_control_blk_addr);
1595         xcRB64.reply_data_length = xcRB32.reply_data_length;
1596         xcRB64.reply_data_addr =
1597                 compat_ptr(xcRB32.reply_data_addr);
1598         xcRB64.priority_window = xcRB32.priority_window;
1599         xcRB64.status = xcRB32.status;
1600         do {
1601                 rc = _zcrypt_send_cprb(perms, &xcRB64);
1602         } while (rc == -EAGAIN);
1603         /* on failure: retry once again after a requested rescan */
1604         if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1605                 do {
1606                         rc = _zcrypt_send_cprb(perms, &xcRB64);
1607                 } while (rc == -EAGAIN);
1608         xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length;
1609         xcRB32.reply_data_length = xcRB64.reply_data_length;
1610         xcRB32.status = xcRB64.status;
1611         if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32)))
1612                 return -EFAULT;
1613         return rc;
1614 }
1615
1616 static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd,
1617                          unsigned long arg)
1618 {
1619         int rc;
1620         struct ap_perms *perms =
1621                 (struct ap_perms *) filp->private_data;
1622
1623         rc = zcrypt_check_ioctl(perms, cmd);
1624         if (rc)
1625                 return rc;
1626
1627         if (cmd == ICARSAMODEXPO)
1628                 return trans_modexpo32(perms, filp, cmd, arg);
1629         if (cmd == ICARSACRT)
1630                 return trans_modexpo_crt32(perms, filp, cmd, arg);
1631         if (cmd == ZSECSENDCPRB)
1632                 return trans_xcRB32(perms, filp, cmd, arg);
1633         return zcrypt_unlocked_ioctl(filp, cmd, arg);
1634 }
1635 #endif
1636
1637 /*
1638  * Misc device file operations.
1639  */
1640 static const struct file_operations zcrypt_fops = {
1641         .owner          = THIS_MODULE,
1642         .read           = zcrypt_read,
1643         .write          = zcrypt_write,
1644         .unlocked_ioctl = zcrypt_unlocked_ioctl,
1645 #ifdef CONFIG_COMPAT
1646         .compat_ioctl   = zcrypt_compat_ioctl,
1647 #endif
1648         .open           = zcrypt_open,
1649         .release        = zcrypt_release,
1650         .llseek         = no_llseek,
1651 };
1652
1653 /*
1654  * Misc device.
1655  */
1656 static struct miscdevice zcrypt_misc_device = {
1657         .minor      = MISC_DYNAMIC_MINOR,
1658         .name       = "z90crypt",
1659         .fops       = &zcrypt_fops,
1660 };
1661
1662 static int zcrypt_rng_device_count;
1663 static u32 *zcrypt_rng_buffer;
1664 static int zcrypt_rng_buffer_index;
1665 static DEFINE_MUTEX(zcrypt_rng_mutex);
1666
1667 static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
1668 {
1669         int rc;
1670
1671         /*
1672          * We don't need locking here because the RNG API guarantees serialized
1673          * read method calls.
1674          */
1675         if (zcrypt_rng_buffer_index == 0) {
1676                 rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1677                 /* on failure: retry once again after a requested rescan */
1678                 if ((rc == -ENODEV) && (zcrypt_process_rescan()))
1679                         rc = zcrypt_rng((char *) zcrypt_rng_buffer);
1680                 if (rc < 0)
1681                         return -EIO;
1682                 zcrypt_rng_buffer_index = rc / sizeof(*data);
1683         }
1684         *data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index];
1685         return sizeof(*data);
1686 }
1687
1688 static struct hwrng zcrypt_rng_dev = {
1689         .name           = "zcrypt",
1690         .data_read      = zcrypt_rng_data_read,
1691         .quality        = 990,
1692 };
1693
1694 int zcrypt_rng_device_add(void)
1695 {
1696         int rc = 0;
1697
1698         mutex_lock(&zcrypt_rng_mutex);
1699         if (zcrypt_rng_device_count == 0) {
1700                 zcrypt_rng_buffer = (u32 *) get_zeroed_page(GFP_KERNEL);
1701                 if (!zcrypt_rng_buffer) {
1702                         rc = -ENOMEM;
1703                         goto out;
1704                 }
1705                 zcrypt_rng_buffer_index = 0;
1706                 if (!zcrypt_hwrng_seed)
1707                         zcrypt_rng_dev.quality = 0;
1708                 rc = hwrng_register(&zcrypt_rng_dev);
1709                 if (rc)
1710                         goto out_free;
1711                 zcrypt_rng_device_count = 1;
1712         } else
1713                 zcrypt_rng_device_count++;
1714         mutex_unlock(&zcrypt_rng_mutex);
1715         return 0;
1716
1717 out_free:
1718         free_page((unsigned long) zcrypt_rng_buffer);
1719 out:
1720         mutex_unlock(&zcrypt_rng_mutex);
1721         return rc;
1722 }
1723
1724 void zcrypt_rng_device_remove(void)
1725 {
1726         mutex_lock(&zcrypt_rng_mutex);
1727         zcrypt_rng_device_count--;
1728         if (zcrypt_rng_device_count == 0) {
1729                 hwrng_unregister(&zcrypt_rng_dev);
1730                 free_page((unsigned long) zcrypt_rng_buffer);
1731         }
1732         mutex_unlock(&zcrypt_rng_mutex);
1733 }
1734
1735 int __init zcrypt_debug_init(void)
1736 {
1737         zcrypt_dbf_info = debug_register("zcrypt", 1, 1,
1738                                          DBF_MAX_SPRINTF_ARGS * sizeof(long));
1739         debug_register_view(zcrypt_dbf_info, &debug_sprintf_view);
1740         debug_set_level(zcrypt_dbf_info, DBF_ERR);
1741
1742         return 0;
1743 }
1744
1745 void zcrypt_debug_exit(void)
1746 {
1747         debug_unregister(zcrypt_dbf_info);
1748 }
1749
1750 #ifdef CONFIG_ZCRYPT_MULTIDEVNODES
1751
1752 static int __init zcdn_init(void)
1753 {
1754         int rc;
1755
1756         /* create a new class 'zcrypt' */
1757         zcrypt_class = class_create(THIS_MODULE, ZCRYPT_NAME);
1758         if (IS_ERR(zcrypt_class)) {
1759                 rc = PTR_ERR(zcrypt_class);
1760                 goto out_class_create_failed;
1761         }
1762         zcrypt_class->dev_release = zcdn_device_release;
1763
1764         /* alloc device minor range */
1765         rc = alloc_chrdev_region(&zcrypt_devt,
1766                                  0, ZCRYPT_MAX_MINOR_NODES,
1767                                  ZCRYPT_NAME);
1768         if (rc)
1769                 goto out_alloc_chrdev_failed;
1770
1771         cdev_init(&zcrypt_cdev, &zcrypt_fops);
1772         zcrypt_cdev.owner = THIS_MODULE;
1773         rc = cdev_add(&zcrypt_cdev, zcrypt_devt, ZCRYPT_MAX_MINOR_NODES);
1774         if (rc)
1775                 goto out_cdev_add_failed;
1776
1777         /* need some class specific sysfs attributes */
1778         rc = class_create_file(zcrypt_class, &class_attr_zcdn_create);
1779         if (rc)
1780                 goto out_class_create_file_1_failed;
1781         rc = class_create_file(zcrypt_class, &class_attr_zcdn_destroy);
1782         if (rc)
1783                 goto out_class_create_file_2_failed;
1784
1785         return 0;
1786
1787 out_class_create_file_2_failed:
1788         class_remove_file(zcrypt_class, &class_attr_zcdn_create);
1789 out_class_create_file_1_failed:
1790         cdev_del(&zcrypt_cdev);
1791 out_cdev_add_failed:
1792         unregister_chrdev_region(zcrypt_devt, ZCRYPT_MAX_MINOR_NODES);
1793 out_alloc_chrdev_failed:
1794         class_destroy(zcrypt_class);
1795 out_class_create_failed:
1796         return rc;
1797 }
1798
1799 static void zcdn_exit(void)
1800 {
1801         class_remove_file(zcrypt_class, &class_attr_zcdn_create);
1802         class_remove_file(zcrypt_class, &class_attr_zcdn_destroy);
1803         zcdn_destroy_all();
1804         cdev_del(&zcrypt_cdev);
1805         unregister_chrdev_region(zcrypt_devt, ZCRYPT_MAX_MINOR_NODES);
1806         class_destroy(zcrypt_class);
1807 }
1808
1809 #endif
1810
1811 /**
1812  * zcrypt_api_init(): Module initialization.
1813  *
1814  * The module initialization code.
1815  */
1816 int __init zcrypt_api_init(void)
1817 {
1818         int rc;
1819
1820         rc = zcrypt_debug_init();
1821         if (rc)
1822                 goto out;
1823
1824 #ifdef CONFIG_ZCRYPT_MULTIDEVNODES
1825         rc = zcdn_init();
1826         if (rc)
1827                 goto out;
1828 #endif
1829
1830         /* Register the request sprayer. */
1831         rc = misc_register(&zcrypt_misc_device);
1832         if (rc < 0)
1833                 goto out_misc_register_failed;
1834
1835         zcrypt_msgtype6_init();
1836         zcrypt_msgtype50_init();
1837
1838         return 0;
1839
1840 out_misc_register_failed:
1841 #ifdef CONFIG_ZCRYPT_MULTIDEVNODES
1842         zcdn_exit();
1843 #endif
1844         zcrypt_debug_exit();
1845 out:
1846         return rc;
1847 }
1848
1849 /**
1850  * zcrypt_api_exit(): Module termination.
1851  *
1852  * The module termination code.
1853  */
1854 void __exit zcrypt_api_exit(void)
1855 {
1856 #ifdef CONFIG_ZCRYPT_MULTIDEVNODES
1857         zcdn_exit();
1858 #endif
1859         misc_deregister(&zcrypt_misc_device);
1860         zcrypt_msgtype6_exit();
1861         zcrypt_msgtype50_exit();
1862         zcrypt_debug_exit();
1863 }
1864
1865 module_init(zcrypt_api_init);
1866 module_exit(zcrypt_api_exit);