190 lines
4.3 KiB
C
190 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* zcrypt 2.1.0
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*
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* Copyright IBM Corp. 2001, 2012
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* Author(s): Robert Burroughs
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* Eric Rossman (edrossma@us.ibm.com)
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* Cornelia Huck <cornelia.huck@de.ibm.com>
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*
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* Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
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* Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Ralph Wuerthner <rwuerthn@de.ibm.com>
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* MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/miscdevice.h>
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#include <linux/fs.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/compat.h>
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#include <linux/slab.h>
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#include <linux/atomic.h>
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#include <linux/uaccess.h>
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#include <linux/hw_random.h>
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#include <linux/debugfs.h>
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#include <asm/debug.h>
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#include "zcrypt_debug.h"
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#include "zcrypt_api.h"
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#include "zcrypt_msgtype6.h"
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#include "zcrypt_msgtype50.h"
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/*
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* Device attributes common for all crypto card devices.
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*/
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static ssize_t type_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct zcrypt_card *zc = to_ap_card(dev)->private;
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return snprintf(buf, PAGE_SIZE, "%s\n", zc->type_string);
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}
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static DEVICE_ATTR_RO(type);
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static ssize_t online_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct zcrypt_card *zc = to_ap_card(dev)->private;
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return snprintf(buf, PAGE_SIZE, "%d\n", zc->online);
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}
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static ssize_t online_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct zcrypt_card *zc = to_ap_card(dev)->private;
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struct zcrypt_queue *zq;
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int online, id;
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if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
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return -EINVAL;
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zc->online = online;
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id = zc->card->id;
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ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online);
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spin_lock(&zcrypt_list_lock);
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list_for_each_entry(zq, &zc->zqueues, list)
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zcrypt_queue_force_online(zq, online);
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spin_unlock(&zcrypt_list_lock);
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return count;
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}
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static DEVICE_ATTR_RW(online);
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static ssize_t load_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct zcrypt_card *zc = to_ap_card(dev)->private;
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return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zc->load));
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}
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static DEVICE_ATTR_RO(load);
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static struct attribute *zcrypt_card_attrs[] = {
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&dev_attr_type.attr,
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&dev_attr_online.attr,
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&dev_attr_load.attr,
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NULL,
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};
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static const struct attribute_group zcrypt_card_attr_group = {
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.attrs = zcrypt_card_attrs,
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};
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struct zcrypt_card *zcrypt_card_alloc(void)
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{
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struct zcrypt_card *zc;
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zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL);
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if (!zc)
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return NULL;
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INIT_LIST_HEAD(&zc->list);
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INIT_LIST_HEAD(&zc->zqueues);
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kref_init(&zc->refcount);
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return zc;
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}
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EXPORT_SYMBOL(zcrypt_card_alloc);
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void zcrypt_card_free(struct zcrypt_card *zc)
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{
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kfree(zc);
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}
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EXPORT_SYMBOL(zcrypt_card_free);
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static void zcrypt_card_release(struct kref *kref)
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{
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struct zcrypt_card *zdev =
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container_of(kref, struct zcrypt_card, refcount);
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zcrypt_card_free(zdev);
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}
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void zcrypt_card_get(struct zcrypt_card *zc)
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{
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kref_get(&zc->refcount);
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}
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EXPORT_SYMBOL(zcrypt_card_get);
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int zcrypt_card_put(struct zcrypt_card *zc)
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{
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return kref_put(&zc->refcount, zcrypt_card_release);
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}
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EXPORT_SYMBOL(zcrypt_card_put);
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/**
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* zcrypt_card_register() - Register a crypto card device.
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* @zc: Pointer to a crypto card device
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*
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* Register a crypto card device. Returns 0 if successful.
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*/
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int zcrypt_card_register(struct zcrypt_card *zc)
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{
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int rc;
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rc = sysfs_create_group(&zc->card->ap_dev.device.kobj,
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&zcrypt_card_attr_group);
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if (rc)
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return rc;
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spin_lock(&zcrypt_list_lock);
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list_add_tail(&zc->list, &zcrypt_card_list);
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spin_unlock(&zcrypt_list_lock);
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zc->online = 1;
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ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id);
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return rc;
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}
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EXPORT_SYMBOL(zcrypt_card_register);
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/**
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* zcrypt_card_unregister(): Unregister a crypto card device.
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* @zc: Pointer to crypto card device
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*
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* Unregister a crypto card device.
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*/
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void zcrypt_card_unregister(struct zcrypt_card *zc)
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{
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ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id);
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spin_lock(&zcrypt_list_lock);
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list_del_init(&zc->list);
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spin_unlock(&zcrypt_list_lock);
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sysfs_remove_group(&zc->card->ap_dev.device.kobj,
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&zcrypt_card_attr_group);
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}
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EXPORT_SYMBOL(zcrypt_card_unregister);
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