drivers/s390/crypto/zcrypt_card.c

   1 /*
   2  *  zcrypt 2.1.0
   3  *
   4  *  Copyright IBM Corp. 2001, 2012
   5  *  Author(s): Robert Burroughs
   6  *             Eric Rossman (edrossma@us.ibm.com)
   7  *             Cornelia Huck <cornelia.huck@de.ibm.com>
   8  *
   9  *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
  10  *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
  11  *                                Ralph Wuerthner <rwuerthn@de.ibm.com>
  12  *  MSGTYPE restruct:             Holger Dengler <hd@linux.vnet.ibm.com>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2, or (at your option)
  17  * any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  22  * GNU General Public License for more details.
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/miscdevice.h>
  29 #include <linux/fs.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/seq_file.h>
  32 #include <linux/compat.h>
  33 #include <linux/slab.h>
  34 #include <linux/atomic.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/hw_random.h>
  37 #include <linux/debugfs.h>
  38 #include <asm/debug.h>
  39
  40 #include "zcrypt_debug.h"
  41 #include "zcrypt_api.h"
  42
  43 #include "zcrypt_msgtype6.h"
  44 #include "zcrypt_msgtype50.h"
  45
  46 /*
  47  * Device attributes common for all crypto card devices.
  48  */
  49
  50 static ssize_t zcrypt_card_type_show(struct device *dev,
  51                                      struct device_attribute *attr, char *buf)
  52 {
  53         struct zcrypt_card *zc = to_ap_card(dev)->private;
  54
  55         return snprintf(buf, PAGE_SIZE, "%s\n", zc->type_string);
  56 }
  57
  58 static DEVICE_ATTR(type, 0444, zcrypt_card_type_show, NULL);
  59
  60 static ssize_t zcrypt_card_online_show(struct device *dev,
  61                                        struct device_attribute *attr,
  62                                        char *buf)
  63 {
  64         struct zcrypt_card *zc = to_ap_card(dev)->private;
  65
  66         return snprintf(buf, PAGE_SIZE, "%d\n", zc->online);
  67 }
  68
  69 static ssize_t zcrypt_card_online_store(struct device *dev,
  70                                         struct device_attribute *attr,
  71                                         const char *buf, size_t count)
  72 {
  73         struct zcrypt_card *zc = to_ap_card(dev)->private;
  74         struct zcrypt_queue *zq;
  75         int online, id;
  76
  77         if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
  78                 return -EINVAL;
  79
  80         zc->online = online;
  81         id = zc->card->id;
  82
  83         ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online);
  84
  85         spin_lock(&zcrypt_list_lock);
  86         list_for_each_entry(zq, &zc->zqueues, list)
  87                 zcrypt_queue_force_online(zq, online);
  88         spin_unlock(&zcrypt_list_lock);
  89         return count;
  90 }
  91
  92 static DEVICE_ATTR(online, 0644, zcrypt_card_online_show,
  93                    zcrypt_card_online_store);
  94
  95 static struct attribute *zcrypt_card_attrs[] = {
  96         &dev_attr_type.attr,
  97         &dev_attr_online.attr,
  98         NULL,
  99 };
 100
 101 static const struct attribute_group zcrypt_card_attr_group = {
 102         .attrs = zcrypt_card_attrs,
 103 };
 104
 105 struct zcrypt_card *zcrypt_card_alloc(void)
 106 {
 107         struct zcrypt_card *zc;
 108
 109         zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL);
 110         if (!zc)
 111                 return NULL;
 112         INIT_LIST_HEAD(&zc->list);
 113         INIT_LIST_HEAD(&zc->zqueues);
 114         kref_init(&zc->refcount);
 115         return zc;
 116 }
 117 EXPORT_SYMBOL(zcrypt_card_alloc);
 118
 119 void zcrypt_card_free(struct zcrypt_card *zc)
 120 {
 121         kfree(zc);
 122 }
 123 EXPORT_SYMBOL(zcrypt_card_free);
 124
 125 static void zcrypt_card_release(struct kref *kref)
 126 {
 127         struct zcrypt_card *zdev =
 128                 container_of(kref, struct zcrypt_card, refcount);
 129         zcrypt_card_free(zdev);
 130 }
 131
 132 void zcrypt_card_get(struct zcrypt_card *zc)
 133 {
 134         kref_get(&zc->refcount);
 135 }
 136 EXPORT_SYMBOL(zcrypt_card_get);
 137
 138 int zcrypt_card_put(struct zcrypt_card *zc)
 139 {
 140         return kref_put(&zc->refcount, zcrypt_card_release);
 141 }
 142 EXPORT_SYMBOL(zcrypt_card_put);
 143
 144 /**
 145  * zcrypt_card_register() - Register a crypto card device.
 146  * @zc: Pointer to a crypto card device
 147  *
 148  * Register a crypto card device. Returns 0 if successful.
 149  */
 150 int zcrypt_card_register(struct zcrypt_card *zc)
 151 {
 152         int rc;
 153
 154         rc = sysfs_create_group(&zc->card->ap_dev.device.kobj,
 155                                 &zcrypt_card_attr_group);
 156         if (rc)
 157                 return rc;
 158
 159         spin_lock(&zcrypt_list_lock);
 160         list_add_tail(&zc->list, &zcrypt_card_list);
 161         spin_unlock(&zcrypt_list_lock);
 162
 163         zc->online = 1;
 164
 165         ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id);
 166
 167         return rc;
 168 }
 169 EXPORT_SYMBOL(zcrypt_card_register);
 170
 171 /**
 172  * zcrypt_card_unregister(): Unregister a crypto card device.
 173  * @zc: Pointer to crypto card device
 174  *
 175  * Unregister a crypto card device.
 176  */
 177 void zcrypt_card_unregister(struct zcrypt_card *zc)
 178 {
 179         ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id);
 180
 181         spin_lock(&zcrypt_list_lock);
 182         list_del_init(&zc->list);
 183         spin_unlock(&zcrypt_list_lock);
 184         sysfs_remove_group(&zc->card->ap_dev.device.kobj,
 185                            &zcrypt_card_attr_group);
 186 }
 187 EXPORT_SYMBOL(zcrypt_card_unregister);