linux/drivers/s390/crypto/zcrypt_queue.c
Greg Kroah-Hartman 0b622e60bc s390: crypto: Remove redundant license text
Now that the SPDX tag is in all drivers/s390/crypto/ files, that
identifies the license in a specific and legally-defined manner.  So the
extra GPL text wording can be removed as it is no longer needed at all.

This is done on a quest to remove the 700+ different ways that files in
the kernel describe the GPL license text.  And there's unneeded stuff
like the address (sometimes incorrect) for the FSF which is never
needed.

No copyright headers or other non-license-description text was removed.

Cc: Harald Freudenberger <freude@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-11-24 14:28:46 +01:00

218 lines
5.1 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* zcrypt 2.1.0
*
* Copyright IBM Corp. 2001, 2012
* Author(s): Robert Burroughs
* Eric Rossman (edrossma@us.ibm.com)
* Cornelia Huck <cornelia.huck@de.ibm.com>
*
* 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>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/compat.h>
#include <linux/slab.h>
#include <linux/atomic.h>
#include <linux/uaccess.h>
#include <linux/hw_random.h>
#include <linux/debugfs.h>
#include <asm/debug.h>
#include "zcrypt_debug.h"
#include "zcrypt_api.h"
#include "zcrypt_msgtype6.h"
#include "zcrypt_msgtype50.h"
/*
* Device attributes common for all crypto queue devices.
*/
static ssize_t zcrypt_queue_online_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct zcrypt_queue *zq = to_ap_queue(dev)->private;
return snprintf(buf, PAGE_SIZE, "%d\n", zq->online);
}
static ssize_t zcrypt_queue_online_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct zcrypt_queue *zq = to_ap_queue(dev)->private;
struct zcrypt_card *zc = zq->zcard;
int online;
if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
return -EINVAL;
if (online && !zc->online)
return -EINVAL;
zq->online = online;
ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x online=%d\n",
AP_QID_CARD(zq->queue->qid),
AP_QID_QUEUE(zq->queue->qid),
online);
if (!online)
ap_flush_queue(zq->queue);
return count;
}
static DEVICE_ATTR(online, 0644, zcrypt_queue_online_show,
zcrypt_queue_online_store);
static struct attribute *zcrypt_queue_attrs[] = {
&dev_attr_online.attr,
NULL,
};
static const struct attribute_group zcrypt_queue_attr_group = {
.attrs = zcrypt_queue_attrs,
};
void zcrypt_queue_force_online(struct zcrypt_queue *zq, int online)
{
zq->online = online;
if (!online)
ap_flush_queue(zq->queue);
}
struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_size)
{
struct zcrypt_queue *zq;
zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL);
if (!zq)
return NULL;
zq->reply.message = kmalloc(max_response_size, GFP_KERNEL);
if (!zq->reply.message)
goto out_free;
zq->reply.length = max_response_size;
INIT_LIST_HEAD(&zq->list);
kref_init(&zq->refcount);
return zq;
out_free:
kfree(zq);
return NULL;
}
EXPORT_SYMBOL(zcrypt_queue_alloc);
void zcrypt_queue_free(struct zcrypt_queue *zq)
{
kfree(zq->reply.message);
kfree(zq);
}
EXPORT_SYMBOL(zcrypt_queue_free);
static void zcrypt_queue_release(struct kref *kref)
{
struct zcrypt_queue *zq =
container_of(kref, struct zcrypt_queue, refcount);
zcrypt_queue_free(zq);
}
void zcrypt_queue_get(struct zcrypt_queue *zq)
{
kref_get(&zq->refcount);
}
EXPORT_SYMBOL(zcrypt_queue_get);
int zcrypt_queue_put(struct zcrypt_queue *zq)
{
return kref_put(&zq->refcount, zcrypt_queue_release);
}
EXPORT_SYMBOL(zcrypt_queue_put);
/**
* zcrypt_queue_register() - Register a crypto queue device.
* @zq: Pointer to a crypto queue device
*
* Register a crypto queue device. Returns 0 if successful.
*/
int zcrypt_queue_register(struct zcrypt_queue *zq)
{
struct zcrypt_card *zc;
int rc;
spin_lock(&zcrypt_list_lock);
zc = zq->queue->card->private;
zcrypt_card_get(zc);
zq->zcard = zc;
zq->online = 1; /* New devices are online by default. */
ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x register online=1\n",
AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));
list_add_tail(&zq->list, &zc->zqueues);
zcrypt_device_count++;
spin_unlock(&zcrypt_list_lock);
rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj,
&zcrypt_queue_attr_group);
if (rc)
goto out;
get_device(&zq->queue->ap_dev.device);
if (zq->ops->rng) {
rc = zcrypt_rng_device_add();
if (rc)
goto out_unregister;
}
return 0;
out_unregister:
sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
&zcrypt_queue_attr_group);
put_device(&zq->queue->ap_dev.device);
out:
spin_lock(&zcrypt_list_lock);
list_del_init(&zq->list);
spin_unlock(&zcrypt_list_lock);
zcrypt_card_put(zc);
return rc;
}
EXPORT_SYMBOL(zcrypt_queue_register);
/**
* zcrypt_queue_unregister(): Unregister a crypto queue device.
* @zq: Pointer to crypto queue device
*
* Unregister a crypto queue device.
*/
void zcrypt_queue_unregister(struct zcrypt_queue *zq)
{
struct zcrypt_card *zc;
ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x unregister\n",
AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));
zc = zq->zcard;
spin_lock(&zcrypt_list_lock);
list_del_init(&zq->list);
zcrypt_device_count--;
spin_unlock(&zcrypt_list_lock);
zcrypt_card_put(zc);
if (zq->ops->rng)
zcrypt_rng_device_remove();
sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
&zcrypt_queue_attr_group);
put_device(&zq->queue->ap_dev.device);
zcrypt_queue_put(zq);
}
EXPORT_SYMBOL(zcrypt_queue_unregister);