Orange Pi5 kernel

// 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 queue devices.
 */
 
static ssize_t online_show(struct device *dev,
<------><------><------>   struct device_attribute *attr,
<------><------><------>   char *buf)
{
<------>struct ap_queue *aq = to_ap_queue(dev);
<------>struct zcrypt_queue *zq = aq->private;
<------>int online = aq->config && zq->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 ap_queue *aq = to_ap_queue(dev);
<------>struct zcrypt_queue *zq = aq->private;
<------>struct zcrypt_card *zc = zq->zcard;
<------>int online;
 
<------>if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
<------><------>return -EINVAL;
 
<------>if (online && (!aq->config || !aq->card->config))
<------><------>return -ENODEV;
<------>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_RW(online);
 
static ssize_t load_show(struct device *dev,
<------><------><------> struct device_attribute *attr,
<------><------><------> char *buf)
{
<------>struct zcrypt_queue *zq = to_ap_queue(dev)->private;
 
<------>return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zq->load));
}
 
static DEVICE_ATTR_RO(load);
 
static struct attribute *zcrypt_queue_attrs[] = {
<------>&dev_attr_online.attr,
<------>&dev_attr_load.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.msg = kmalloc(max_response_size, GFP_KERNEL);
<------>if (!zq->reply.msg)
<------><------>goto out_free;
<------>zq->reply.len = 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.msg);
<------>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;
 
<------>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);
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);
<------>if (zq->ops->rng)
<------><------>zcrypt_rng_device_remove();
<------>sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
<------><------><------>   &zcrypt_queue_attr_group);
<------>zcrypt_card_put(zc);
<------>zcrypt_queue_put(zq);
}
EXPORT_SYMBOL(zcrypt_queue_unregister);