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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235// 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/export.h>#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/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 zcrypt_queue *zq = dev_get_drvdata(dev); struct ap_queue *aq = to_ap_queue(dev); int online = aq->config && !aq->chkstop && zq->online ? 1 : 0;
return sysfs_emit(buf, "%d\n", online);}
static ssize_t online_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count){ struct zcrypt_queue *zq = dev_get_drvdata(dev); struct ap_queue *aq = to_ap_queue(dev); 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 || aq->chkstop || aq->card->chkstop)) return -ENODEV; if (online && !zc->online) return -EINVAL; zq->online = online;
ZCRYPT_DBF_INFO("%s queue=%02x.%04x online=%d\n", __func__, AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid), online);
ap_send_online_uevent(&aq->ap_dev, 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 = dev_get_drvdata(dev);
return sysfs_emit(buf, "%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,};
bool zcrypt_queue_force_online(struct zcrypt_queue *zq, int online){ if (!!zq->online != !!online) { zq->online = online; if (!online) ap_flush_queue(zq->queue); return true; } return false;}
struct zcrypt_queue *zcrypt_queue_alloc(size_t reply_buf_size){ struct zcrypt_queue *zq;
zq = kzalloc_obj(*zq); if (!zq) return NULL; zq->reply.msg = kmalloc(reply_buf_size, GFP_KERNEL); if (!zq->reply.msg) goto out_free; zq->reply.bufsize = reply_buf_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 = dev_get_drvdata(&zq->queue->card->ap_dev.device); zcrypt_card_get(zc); zq->zcard = zc; zq->online = 1; /* New devices are online by default. */
ZCRYPT_DBF_INFO("%s queue=%02x.%04x register online=1\n", __func__, AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));
list_add_tail(&zq->list, &zc->zqueues); 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_INFO("%s queue=%02x.%04x unregister\n", __func__, 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); 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);