linux/drivers/s390/crypto/zcrypt_card.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 *  Copyright IBM Corp. 2001, 2012
   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 */
  13
  14#include <linux/module.h>
  15#include <linux/init.h>
  16#include <linux/interrupt.h>
  17#include <linux/miscdevice.h>
  18#include <linux/fs.h>
  19#include <linux/proc_fs.h>
  20#include <linux/seq_file.h>
  21#include <linux/compat.h>
  22#include <linux/slab.h>
  23#include <linux/atomic.h>
  24#include <linux/uaccess.h>
  25#include <linux/hw_random.h>
  26#include <linux/debugfs.h>
  27#include <asm/debug.h>
  28
  29#include "zcrypt_debug.h"
  30#include "zcrypt_api.h"
  31
  32#include "zcrypt_msgtype6.h"
  33#include "zcrypt_msgtype50.h"
  34
  35/*
  36 * Device attributes common for all crypto card devices.
  37 */
  38
  39static ssize_t type_show(struct device *dev,
  40                         struct device_attribute *attr, char *buf)
  41{
  42        struct zcrypt_card *zc = to_ap_card(dev)->private;
  43
  44        return scnprintf(buf, PAGE_SIZE, "%s\n", zc->type_string);
  45}
  46
  47static DEVICE_ATTR_RO(type);
  48
  49static ssize_t online_show(struct device *dev,
  50                           struct device_attribute *attr,
  51                           char *buf)
  52{
  53        struct ap_card *ac = to_ap_card(dev);
  54        struct zcrypt_card *zc = ac->private;
  55        int online = ac->config && zc->online ? 1 : 0;
  56
  57        return scnprintf(buf, PAGE_SIZE, "%d\n", online);
  58}
  59
  60static ssize_t online_store(struct device *dev,
  61                            struct device_attribute *attr,
  62                            const char *buf, size_t count)
  63{
  64        struct ap_card *ac = to_ap_card(dev);
  65        struct zcrypt_card *zc = ac->private;
  66        struct zcrypt_queue *zq;
  67        int online, id;
  68
  69        if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
  70                return -EINVAL;
  71
  72        if (online && !ac->config)
  73                return -ENODEV;
  74
  75        zc->online = online;
  76        id = zc->card->id;
  77
  78        ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online);
  79
  80        spin_lock(&zcrypt_list_lock);
  81        list_for_each_entry(zq, &zc->zqueues, list)
  82                zcrypt_queue_force_online(zq, online);
  83        spin_unlock(&zcrypt_list_lock);
  84        return count;
  85}
  86
  87static DEVICE_ATTR_RW(online);
  88
  89static ssize_t load_show(struct device *dev,
  90                         struct device_attribute *attr,
  91                         char *buf)
  92{
  93        struct zcrypt_card *zc = to_ap_card(dev)->private;
  94
  95        return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zc->load));
  96}
  97
  98static DEVICE_ATTR_RO(load);
  99
 100static struct attribute *zcrypt_card_attrs[] = {
 101        &dev_attr_type.attr,
 102        &dev_attr_online.attr,
 103        &dev_attr_load.attr,
 104        NULL,
 105};
 106
 107static const struct attribute_group zcrypt_card_attr_group = {
 108        .attrs = zcrypt_card_attrs,
 109};
 110
 111struct zcrypt_card *zcrypt_card_alloc(void)
 112{
 113        struct zcrypt_card *zc;
 114
 115        zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL);
 116        if (!zc)
 117                return NULL;
 118        INIT_LIST_HEAD(&zc->list);
 119        INIT_LIST_HEAD(&zc->zqueues);
 120        kref_init(&zc->refcount);
 121        return zc;
 122}
 123EXPORT_SYMBOL(zcrypt_card_alloc);
 124
 125void zcrypt_card_free(struct zcrypt_card *zc)
 126{
 127        kfree(zc);
 128}
 129EXPORT_SYMBOL(zcrypt_card_free);
 130
 131static void zcrypt_card_release(struct kref *kref)
 132{
 133        struct zcrypt_card *zdev =
 134                container_of(kref, struct zcrypt_card, refcount);
 135        zcrypt_card_free(zdev);
 136}
 137
 138void zcrypt_card_get(struct zcrypt_card *zc)
 139{
 140        kref_get(&zc->refcount);
 141}
 142EXPORT_SYMBOL(zcrypt_card_get);
 143
 144int zcrypt_card_put(struct zcrypt_card *zc)
 145{
 146        return kref_put(&zc->refcount, zcrypt_card_release);
 147}
 148EXPORT_SYMBOL(zcrypt_card_put);
 149
 150/**
 151 * zcrypt_card_register() - Register a crypto card device.
 152 * @zc: Pointer to a crypto card device
 153 *
 154 * Register a crypto card device. Returns 0 if successful.
 155 */
 156int zcrypt_card_register(struct zcrypt_card *zc)
 157{
 158        int rc;
 159
 160        spin_lock(&zcrypt_list_lock);
 161        list_add_tail(&zc->list, &zcrypt_card_list);
 162        spin_unlock(&zcrypt_list_lock);
 163
 164        zc->online = 1;
 165
 166        ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id);
 167
 168        rc = sysfs_create_group(&zc->card->ap_dev.device.kobj,
 169                                &zcrypt_card_attr_group);
 170        if (rc) {
 171                spin_lock(&zcrypt_list_lock);
 172                list_del_init(&zc->list);
 173                spin_unlock(&zcrypt_list_lock);
 174        }
 175
 176        return rc;
 177}
 178EXPORT_SYMBOL(zcrypt_card_register);
 179
 180/**
 181 * zcrypt_card_unregister(): Unregister a crypto card device.
 182 * @zc: Pointer to crypto card device
 183 *
 184 * Unregister a crypto card device.
 185 */
 186void zcrypt_card_unregister(struct zcrypt_card *zc)
 187{
 188        ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id);
 189
 190        spin_lock(&zcrypt_list_lock);
 191        list_del_init(&zc->list);
 192        spin_unlock(&zcrypt_list_lock);
 193        sysfs_remove_group(&zc->card->ap_dev.device.kobj,
 194                           &zcrypt_card_attr_group);
 195        zcrypt_card_put(zc);
 196}
 197EXPORT_SYMBOL(zcrypt_card_unregister);
 198