LXR linux/drivers/s390/crypto/zcrypt

   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 zcrypt_card *zc = to_ap_card(dev)->private;
  54
  55        return scnprintf(buf, PAGE_SIZE, "%d\n", zc->online);
  56}
  57
  58static ssize_t online_store(struct device *dev,
  59                            struct device_attribute *attr,
  60                            const char *buf, size_t count)
  61{
  62        struct zcrypt_card *zc = to_ap_card(dev)->private;
  63        struct zcrypt_queue *zq;
  64        int online, id;
  65
  66        if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
  67                return -EINVAL;
  68
  69        zc->online = online;
  70        id = zc->card->id;
  71
  72        ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online);
  73
  74        spin_lock(&zcrypt_list_lock);
  75        list_for_each_entry(zq, &zc->zqueues, list)
  76                zcrypt_queue_force_online(zq, online);
  77        spin_unlock(&zcrypt_list_lock);
  78        return count;
  79}
  80
  81static DEVICE_ATTR_RW(online);
  82
  83static ssize_t load_show(struct device *dev,
  84                         struct device_attribute *attr,
  85                         char *buf)
  86{
  87        struct zcrypt_card *zc = to_ap_card(dev)->private;
  88
  89        return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zc->load));
  90}
  91
  92static DEVICE_ATTR_RO(load);
  93
  94static struct attribute *zcrypt_card_attrs[] = {
  95        &dev_attr_type.attr,
  96        &dev_attr_online.attr,
  97        &dev_attr_load.attr,
  98        NULL,
  99};
 100
 101static const struct attribute_group zcrypt_card_attr_group = {
 102        .attrs = zcrypt_card_attrs,
 103};
 104
 105struct 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}
 117EXPORT_SYMBOL(zcrypt_card_alloc);
 118
 119void zcrypt_card_free(struct zcrypt_card *zc)
 120{
 121        kfree(zc);
 122}
 123EXPORT_SYMBOL(zcrypt_card_free);
 124
 125static 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
 132void zcrypt_card_get(struct zcrypt_card *zc)
 133{
 134        kref_get(&zc->refcount);
 135}
 136EXPORT_SYMBOL(zcrypt_card_get);
 137
 138int zcrypt_card_put(struct zcrypt_card *zc)
 139{
 140        return kref_put(&zc->refcount, zcrypt_card_release);
 141}
 142EXPORT_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 */
 150int 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}
 169EXPORT_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 */
 177void 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}
 187EXPORT_SYMBOL(zcrypt_card_unregister);
 188