Release 4.11 drivers/s390/crypto/zcrypt_queue.c
/*
* 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>
*
* 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
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#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);
}
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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;
}
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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 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);
}
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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;
}
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EXPORT_SYMBOL(zcrypt_queue_alloc);
void zcrypt_queue_free(struct zcrypt_queue *zq)
{
kfree(zq->reply.message);
kfree(zq);
}
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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);
}
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void zcrypt_queue_get(struct zcrypt_queue *zq)
{
kref_get(&zq->refcount);
}
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EXPORT_SYMBOL(zcrypt_queue_get);
int zcrypt_queue_put(struct zcrypt_queue *zq)
{
return kref_put(&zq->refcount, zcrypt_queue_release);
}
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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;
}
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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);
}
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EXPORT_SYMBOL(zcrypt_queue_unregister);
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| Total | 874 | 100.00% | 2 | 100.00% |
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