s390/zcrypt: Separate msgtype implementation from card modules.
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>
diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
index 2f94132..f1f026e 100644
--- a/drivers/s390/crypto/zcrypt_api.c
+++ b/drivers/s390/crypto/zcrypt_api.c
@@ -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 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 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 @@
}
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.
*