![Harald Freudenberger](/assets/img/avatar_default.png)
Some cleanup in the s390 zcrypt device driver: - Removed fragments of pcixx crypto card code. This code can't be reached anymore because the hardware detection function does not recognize crypto cards < CEX2 since commit f56545430736 ("s390/zcrypt: Introduce QACT support for AP bus devices.") - Rename of some files and driver names which where still reflecting pcixx support to cex2a/cex2c. - Removed all the zcrypt version strings in the file headers. There is only one place left - the zcrypt.h header file is now the only place for zcrypt device driver version info. - Zcrypt version pump up from 2.2.0 to 2.2.1. Signed-off-by: Harald Freudenberger <freude@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
227 lines
5.3 KiB
C
227 lines
5.3 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 = to_ap_queue(dev)->private;
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return snprintf(buf, PAGE_SIZE, "%d\n", zq->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 = to_ap_queue(dev)->private;
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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 && !zc->online)
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return -EINVAL;
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zq->online = online;
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ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x online=%d\n",
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AP_QID_CARD(zq->queue->qid),
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AP_QID_QUEUE(zq->queue->qid),
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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 = to_ap_queue(dev)->private;
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return snprintf(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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void zcrypt_queue_force_online(struct zcrypt_queue *zq, int online)
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{
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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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}
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struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_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.message = kmalloc(max_response_size, GFP_KERNEL);
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if (!zq->reply.message)
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goto out_free;
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zq->reply.length = max_response_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.message);
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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 = zq->queue->card->private;
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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(DBF_INFO, "queue=%02x.%04x register online=1\n",
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AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));
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list_add_tail(&zq->list, &zc->zqueues);
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zcrypt_device_count++;
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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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get_device(&zq->queue->ap_dev.device);
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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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put_device(&zq->queue->ap_dev.device);
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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(DBF_INFO, "queue=%02x.%04x unregister\n",
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AP_QID_CARD(zq->queue->qid), 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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zcrypt_device_count--;
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spin_unlock(&zcrypt_list_lock);
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zcrypt_card_put(zc);
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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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put_device(&zq->queue->ap_dev.device);
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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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