234 строки
5.4 KiB
C
234 строки
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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 queue devices.
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*/
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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_queue *zq = dev_get_drvdata(dev);
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struct ap_queue *aq = to_ap_queue(dev);
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int online = aq->config && zq->online ? 1 : 0;
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return scnprintf(buf, PAGE_SIZE, "%d\n", 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_queue *zq = dev_get_drvdata(dev);
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struct ap_queue *aq = to_ap_queue(dev);
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struct zcrypt_card *zc = zq->zcard;
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int online;
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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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if (online && (!aq->config || !aq->card->config))
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return -ENODEV;
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if (online && !zc->online)
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return -EINVAL;
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zq->online = online;
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ZCRYPT_DBF_INFO("%s queue=%02x.%04x online=%d\n",
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__func__, AP_QID_CARD(zq->queue->qid),
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AP_QID_QUEUE(zq->queue->qid), online);
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ap_send_online_uevent(&aq->ap_dev, online);
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if (!online)
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ap_flush_queue(zq->queue);
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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_queue *zq = dev_get_drvdata(dev);
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return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zq->load));
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}
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static DEVICE_ATTR_RO(load);
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static struct attribute *zcrypt_queue_attrs[] = {
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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_queue_attr_group = {
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.attrs = zcrypt_queue_attrs,
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};
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bool zcrypt_queue_force_online(struct zcrypt_queue *zq, int online)
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{
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if (!!zq->online != !!online) {
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zq->online = online;
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if (!online)
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ap_flush_queue(zq->queue);
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return true;
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}
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return false;
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}
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struct zcrypt_queue *zcrypt_queue_alloc(size_t reply_buf_size)
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{
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struct zcrypt_queue *zq;
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zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL);
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if (!zq)
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return NULL;
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zq->reply.msg = kmalloc(reply_buf_size, GFP_KERNEL);
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if (!zq->reply.msg)
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goto out_free;
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zq->reply.bufsize = reply_buf_size;
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INIT_LIST_HEAD(&zq->list);
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kref_init(&zq->refcount);
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return zq;
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out_free:
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kfree(zq);
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return NULL;
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}
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EXPORT_SYMBOL(zcrypt_queue_alloc);
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void zcrypt_queue_free(struct zcrypt_queue *zq)
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{
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kfree(zq->reply.msg);
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kfree(zq);
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}
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EXPORT_SYMBOL(zcrypt_queue_free);
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static void zcrypt_queue_release(struct kref *kref)
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{
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struct zcrypt_queue *zq =
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container_of(kref, struct zcrypt_queue, refcount);
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zcrypt_queue_free(zq);
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}
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void zcrypt_queue_get(struct zcrypt_queue *zq)
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{
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kref_get(&zq->refcount);
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}
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EXPORT_SYMBOL(zcrypt_queue_get);
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int zcrypt_queue_put(struct zcrypt_queue *zq)
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{
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return kref_put(&zq->refcount, zcrypt_queue_release);
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}
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EXPORT_SYMBOL(zcrypt_queue_put);
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/**
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* zcrypt_queue_register() - Register a crypto queue device.
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* @zq: Pointer to a crypto queue device
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*
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* Register a crypto queue device. Returns 0 if successful.
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*/
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int zcrypt_queue_register(struct zcrypt_queue *zq)
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{
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struct zcrypt_card *zc;
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int rc;
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spin_lock(&zcrypt_list_lock);
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zc = dev_get_drvdata(&zq->queue->card->ap_dev.device);
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zcrypt_card_get(zc);
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zq->zcard = zc;
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zq->online = 1; /* New devices are online by default. */
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ZCRYPT_DBF_INFO("%s queue=%02x.%04x register online=1\n",
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__func__, AP_QID_CARD(zq->queue->qid),
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AP_QID_QUEUE(zq->queue->qid));
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list_add_tail(&zq->list, &zc->zqueues);
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spin_unlock(&zcrypt_list_lock);
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rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj,
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&zcrypt_queue_attr_group);
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if (rc)
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goto out;
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if (zq->ops->rng) {
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rc = zcrypt_rng_device_add();
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if (rc)
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goto out_unregister;
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}
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return 0;
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out_unregister:
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sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
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&zcrypt_queue_attr_group);
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out:
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spin_lock(&zcrypt_list_lock);
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list_del_init(&zq->list);
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spin_unlock(&zcrypt_list_lock);
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zcrypt_card_put(zc);
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return rc;
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}
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EXPORT_SYMBOL(zcrypt_queue_register);
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/**
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* zcrypt_queue_unregister(): Unregister a crypto queue device.
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* @zq: Pointer to crypto queue device
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*
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* Unregister a crypto queue device.
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*/
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void zcrypt_queue_unregister(struct zcrypt_queue *zq)
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{
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struct zcrypt_card *zc;
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ZCRYPT_DBF_INFO("%s queue=%02x.%04x unregister\n",
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__func__, AP_QID_CARD(zq->queue->qid),
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AP_QID_QUEUE(zq->queue->qid));
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zc = zq->zcard;
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spin_lock(&zcrypt_list_lock);
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list_del_init(&zq->list);
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spin_unlock(&zcrypt_list_lock);
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if (zq->ops->rng)
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zcrypt_rng_device_remove();
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sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
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&zcrypt_queue_attr_group);
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zcrypt_card_put(zc);
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zcrypt_queue_put(zq);
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}
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EXPORT_SYMBOL(zcrypt_queue_unregister);
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