drivers/s390/crypto/zcrypt_card.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  zcrypt 2.1.0
   4  *
   5  *  Copyright IBM Corp. 2001, 2012
   6  *  Author(s): Robert Burroughs
   7  *             Eric Rossman (edrossma@us.ibm.com)
   8  *             Cornelia Huck <cornelia.huck@de.ibm.com>
   9  *
  10  *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
  11  *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
  12  *                                Ralph Wuerthner <rwuerthn@de.ibm.com>
  13  *  MSGTYPE restruct:             Holger Dengler <hd@linux.vnet.ibm.com>
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/miscdevice.h>
  20 #include <linux/fs.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/seq_file.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 <asm/debug.h>
  30
  31 #include "zcrypt_debug.h"
  32 #include "zcrypt_api.h"
  33
  34 #include "zcrypt_msgtype6.h"
  35 #include "zcrypt_msgtype50.h"
  36
  37 /*
  38  * Device attributes common for all crypto card devices.
  39  */
  40
  41 static ssize_t zcrypt_card_type_show(struct device *dev,
  42                                      struct device_attribute *attr, char *buf)
  43 {
  44         struct zcrypt_card *zc = to_ap_card(dev)->private;
  45
  46         return snprintf(buf, PAGE_SIZE, "%s\n", zc->type_string);
  47 }
  48
  49 static DEVICE_ATTR(type, 0444, zcrypt_card_type_show, NULL);
  50
  51 static ssize_t zcrypt_card_online_show(struct device *dev,
  52                                        struct device_attribute *attr,
  53                                        char *buf)
  54 {
  55         struct zcrypt_card *zc = to_ap_card(dev)->private;
  56
  57         return snprintf(buf, PAGE_SIZE, "%d\n", zc->online);
  58 }
  59
  60 static ssize_t zcrypt_card_online_store(struct device *dev,
  61                                         struct device_attribute *attr,
  62                                         const char *buf, size_t count)
  63 {
  64         struct zcrypt_card *zc = to_ap_card(dev)->private;
  65         struct zcrypt_queue *zq;
  66         int online, id;
  67
  68         if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
  69                 return -EINVAL;
  70
  71         zc->online = online;
  72         id = zc->card->id;
  73
  74         ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online);
  75
  76         spin_lock(&zcrypt_list_lock);
  77         list_for_each_entry(zq, &zc->zqueues, list)
  78                 zcrypt_queue_force_online(zq, online);
  79         spin_unlock(&zcrypt_list_lock);
  80         return count;
  81 }
  82
  83 static DEVICE_ATTR(online, 0644, zcrypt_card_online_show,
  84                    zcrypt_card_online_store);
  85
  86 static struct attribute *zcrypt_card_attrs[] = {
  87         &dev_attr_type.attr,
  88         &dev_attr_online.attr,
  89         NULL,
  90 };
  91
  92 static const struct attribute_group zcrypt_card_attr_group = {
  93         .attrs = zcrypt_card_attrs,
  94 };
  95
  96 struct zcrypt_card *zcrypt_card_alloc(void)
  97 {
  98         struct zcrypt_card *zc;
  99
 100         zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL);
 101         if (!zc)
 102                 return NULL;
 103         INIT_LIST_HEAD(&zc->list);
 104         INIT_LIST_HEAD(&zc->zqueues);
 105         kref_init(&zc->refcount);
 106         return zc;
 107 }
 108 EXPORT_SYMBOL(zcrypt_card_alloc);
 109
 110 void zcrypt_card_free(struct zcrypt_card *zc)
 111 {
 112         kfree(zc);
 113 }
 114 EXPORT_SYMBOL(zcrypt_card_free);
 115
 116 static void zcrypt_card_release(struct kref *kref)
 117 {
 118         struct zcrypt_card *zdev =
 119                 container_of(kref, struct zcrypt_card, refcount);
 120         zcrypt_card_free(zdev);
 121 }
 122
 123 void zcrypt_card_get(struct zcrypt_card *zc)
 124 {
 125         kref_get(&zc->refcount);
 126 }
 127 EXPORT_SYMBOL(zcrypt_card_get);
 128
 129 int zcrypt_card_put(struct zcrypt_card *zc)
 130 {
 131         return kref_put(&zc->refcount, zcrypt_card_release);
 132 }
 133 EXPORT_SYMBOL(zcrypt_card_put);
 134
 135 /**
 136  * zcrypt_card_register() - Register a crypto card device.
 137  * @zc: Pointer to a crypto card device
 138  *
 139  * Register a crypto card device. Returns 0 if successful.
 140  */
 141 int zcrypt_card_register(struct zcrypt_card *zc)
 142 {
 143         int rc;
 144
 145         rc = sysfs_create_group(&zc->card->ap_dev.device.kobj,
 146                                 &zcrypt_card_attr_group);
 147         if (rc)
 148                 return rc;
 149
 150         spin_lock(&zcrypt_list_lock);
 151         list_add_tail(&zc->list, &zcrypt_card_list);
 152         spin_unlock(&zcrypt_list_lock);
 153
 154         zc->online = 1;
 155
 156         ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id);
 157
 158         return rc;
 159 }
 160 EXPORT_SYMBOL(zcrypt_card_register);
 161
 162 /**
 163  * zcrypt_card_unregister(): Unregister a crypto card device.
 164  * @zc: Pointer to crypto card device
 165  *
 166  * Unregister a crypto card device.
 167  */
 168 void zcrypt_card_unregister(struct zcrypt_card *zc)
 169 {
 170         ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id);
 171
 172         spin_lock(&zcrypt_list_lock);
 173         list_del_init(&zc->list);
 174         spin_unlock(&zcrypt_list_lock);
 175         sysfs_remove_group(&zc->card->ap_dev.device.kobj,
 176                            &zcrypt_card_attr_group);
 177 }
 178 EXPORT_SYMBOL(zcrypt_card_unregister);