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s390/zcrypt: Separate msgtype implementation from card modules.

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Msgtype implementations are now separated from card specific modules
and can be dynamically registered. Existing msgtype implementations
are restructured in modules.

Signed-off-by: Holger Dengler <hd@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Holger Dengler
2012-08-28 16:45:36 +02:00
committed by Martin Schwidefsky
parent b26bd9413c
commit 5e55a488c8
10 changed files with 1707 additions and 1124 deletions
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73
drivers/s390/crypto/zcrypt_api.c
View File

@@ -1,7 +1,7 @@
/*
* zcrypt 2.1.0
*
* Copyright IBM Corp. 2001, 2006
* Copyright IBM Corp. 2001, 2012
* Author(s): Robert Burroughs
* Eric Rossman (edrossma@us.ibm.com)
* Cornelia Huck <cornelia.huck@de.ibm.com>
@@ -9,6 +9,7 @@
* Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
* Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
* Ralph Wuerthner <rwuerthn@de.ibm.com>
* MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -44,8 +45,8 @@
* Module description.
*/
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("Cryptographic Coprocessor interface, "
"Copyright IBM Corp. 2001, 2006");
MODULE_DESCRIPTION("Cryptographic Coprocessor interface, " \
"Copyright IBM Corp. 2001, 2012");
MODULE_LICENSE("GPL");
static DEFINE_SPINLOCK(zcrypt_device_lock);
@@ -56,6 +57,9 @@ static atomic_t zcrypt_open_count = ATOMIC_INIT(0);
static int zcrypt_rng_device_add(void);
static void zcrypt_rng_device_remove(void);
static DEFINE_SPINLOCK(zcrypt_ops_list_lock);
static LIST_HEAD(zcrypt_ops_list);
/*
* Device attributes common for all crypto devices.
*/
@@ -215,6 +219,8 @@ int zcrypt_device_register(struct zcrypt_device *zdev)
{
int rc;
if (!zdev->ops)
return -ENODEV;
rc = sysfs_create_group(&zdev->ap_dev->device.kobj,
&zcrypt_device_attr_group);
if (rc)
@@ -269,6 +275,67 @@ void zcrypt_device_unregister(struct zcrypt_device *zdev)
}
EXPORT_SYMBOL(zcrypt_device_unregister);
void zcrypt_msgtype_register(struct zcrypt_ops *zops)
{
if (zops->owner) {
spin_lock_bh(&zcrypt_ops_list_lock);
list_add_tail(&zops->list, &zcrypt_ops_list);
spin_unlock_bh(&zcrypt_ops_list_lock);
}
}
EXPORT_SYMBOL(zcrypt_msgtype_register);
void zcrypt_msgtype_unregister(struct zcrypt_ops *zops)
{
spin_lock_bh(&zcrypt_ops_list_lock);
list_del_init(&zops->list);
spin_unlock_bh(&zcrypt_ops_list_lock);
}
EXPORT_SYMBOL(zcrypt_msgtype_unregister);
static inline
struct zcrypt_ops *__ops_lookup(unsigned char *name, int variant)
{
struct zcrypt_ops *zops;
int found = 0;
spin_lock_bh(&zcrypt_ops_list_lock);
list_for_each_entry(zops, &zcrypt_ops_list, list) {
if ((zops->variant == variant) &&
(!strncmp(zops->owner->name, name, MODULE_NAME_LEN))) {
found = 1;
break;
}
}
spin_unlock_bh(&zcrypt_ops_list_lock);
if (!found)
return NULL;
return zops;
}
struct zcrypt_ops *zcrypt_msgtype_request(unsigned char *name, int variant)
{
struct zcrypt_ops *zops = NULL;
zops = __ops_lookup(name, variant);
if (!zops) {
request_module(name);
zops = __ops_lookup(name, variant);
}
if ((!zops) || (!try_module_get(zops->owner)))
return NULL;
return zops;
}
EXPORT_SYMBOL(zcrypt_msgtype_request);
void zcrypt_msgtype_release(struct zcrypt_ops *zops)
{
if (zops)
module_put(zops->owner);
}
EXPORT_SYMBOL(zcrypt_msgtype_release);
/**
* zcrypt_read (): Not supported beyond zcrypt 1.3.1.
*