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// SPDX-License-Identifier: GPL-2.0+
/*
* 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 card devices.
*/
static ssize_t type_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct zcrypt_card *zc = dev_get_drvdata(dev);
return scnprintf(buf, PAGE_SIZE, "%s\n", zc->type_string);
}
static DEVICE_ATTR_RO(type);
static ssize_t online_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct zcrypt_card *zc = dev_get_drvdata(dev);
struct ap_card *ac = to_ap_card(dev);
int online = ac->config && zc->online ? 1 : 0;
return scnprintf(buf, PAGE_SIZE, "%d\n", online);
}
static ssize_t online_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct zcrypt_card *zc = dev_get_drvdata(dev);
struct ap_card *ac = to_ap_card(dev);
struct zcrypt_queue *zq;
int online, id, i = 0, maxzqs = 0;
struct zcrypt_queue **zq_uelist = NULL;
if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
return -EINVAL;
if (online && !ac->config)
return -ENODEV;
zc->online = online;
id = zc->card->id;
ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online);
ap_send_online_uevent(&ac->ap_dev, online);
spin_lock(&zcrypt_list_lock);
/*
* As we are in atomic context here, directly sending uevents
* does not work. So collect the zqueues in a dynamic array
* and process them after zcrypt_list_lock release. As we get/put
* the zqueue objects, we make sure they exist after lock release.
*/
list_for_each_entry(zq, &zc->zqueues, list)
maxzqs++;
if (maxzqs > 0)
zq_uelist = kcalloc(maxzqs + 1, sizeof(zq), GFP_ATOMIC);
list_for_each_entry(zq, &zc->zqueues, list)
if (zcrypt_queue_force_online(zq, online))
if (zq_uelist) {
zcrypt_queue_get(zq);
zq_uelist[i++] = zq;
}
spin_unlock(&zcrypt_list_lock);
if (zq_uelist) {
for (i = 0; zq_uelist[i]; i++) {
zq = zq_uelist[i];
ap_send_online_uevent(&zq->queue->ap_dev, online);
zcrypt_queue_put(zq);
}
kfree(zq_uelist);
}
return count;
}
static DEVICE_ATTR_RW(online);
static ssize_t load_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct zcrypt_card *zc = dev_get_drvdata(dev);
return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zc->load));
}
static DEVICE_ATTR_RO(load);
static struct attribute *zcrypt_card_attrs[] = {
&dev_attr_type.attr,
&dev_attr_online.attr,
&dev_attr_load.attr,
NULL,
};
static const struct attribute_group zcrypt_card_attr_group = {
.attrs = zcrypt_card_attrs,
};
struct zcrypt_card *zcrypt_card_alloc(void)
{
struct zcrypt_card *zc;
zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL);
if (!zc)
return NULL;
INIT_LIST_HEAD(&zc->list);
INIT_LIST_HEAD(&zc->zqueues);
kref_init(&zc->refcount);
return zc;
}
EXPORT_SYMBOL(zcrypt_card_alloc);
void zcrypt_card_free(struct zcrypt_card *zc)
{
kfree(zc);
}
EXPORT_SYMBOL(zcrypt_card_free);
static void zcrypt_card_release(struct kref *kref)
{
struct zcrypt_card *zdev =
container_of(kref, struct zcrypt_card, refcount);
zcrypt_card_free(zdev);
}
void zcrypt_card_get(struct zcrypt_card *zc)
{
kref_get(&zc->refcount);
}
EXPORT_SYMBOL(zcrypt_card_get);
int zcrypt_card_put(struct zcrypt_card *zc)
{
return kref_put(&zc->refcount, zcrypt_card_release);
}
EXPORT_SYMBOL(zcrypt_card_put);
/**
* zcrypt_card_register() - Register a crypto card device.
* @zc: Pointer to a crypto card device
*
* Register a crypto card device. Returns 0 if successful.
*/
int zcrypt_card_register(struct zcrypt_card *zc)
{
int rc;
spin_lock(&zcrypt_list_lock);
list_add_tail(&zc->list, &zcrypt_card_list);
spin_unlock(&zcrypt_list_lock);
zc->online = 1;
ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id);
rc = sysfs_create_group(&zc->card->ap_dev.device.kobj,
&zcrypt_card_attr_group);
if (rc) {
spin_lock(&zcrypt_list_lock);
list_del_init(&zc->list);
spin_unlock(&zcrypt_list_lock);
}
return rc;
}
EXPORT_SYMBOL(zcrypt_card_register);
/**
* zcrypt_card_unregister(): Unregister a crypto card device.
* @zc: Pointer to crypto card device
*
* Unregister a crypto card device.
*/
void zcrypt_card_unregister(struct zcrypt_card *zc)
{
ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id);
spin_lock(&zcrypt_list_lock);
list_del_init(&zc->list);
spin_unlock(&zcrypt_list_lock);
sysfs_remove_group(&zc->card->ap_dev.device.kobj,
&zcrypt_card_attr_group);
zcrypt_card_put(zc);
}
EXPORT_SYMBOL(zcrypt_card_unregister);
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