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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Copyright IBM Corp. 2001, 20124 * Author(s): Robert Burroughs5 * Eric Rossman (edrossma@us.ibm.com)6 * Cornelia Huck <cornelia.huck@de.ibm.com>7 *8 * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)9 * Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>10 * Ralph Wuerthner <rwuerthn@de.ibm.com>11 * MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com>12 */13 14#include <linux/module.h>15#include <linux/init.h>16#include <linux/interrupt.h>17#include <linux/miscdevice.h>18#include <linux/fs.h>19#include <linux/proc_fs.h>20#include <linux/seq_file.h>21#include <linux/compat.h>22#include <linux/slab.h>23#include <linux/atomic.h>24#include <linux/uaccess.h>25#include <linux/hw_random.h>26#include <linux/debugfs.h>27#include <asm/debug.h>28 29#include "zcrypt_debug.h"30#include "zcrypt_api.h"31 32#include "zcrypt_msgtype6.h"33#include "zcrypt_msgtype50.h"34 35/*36 * Device attributes common for all crypto queue devices.37 */38 39static ssize_t online_show(struct device *dev,40 struct device_attribute *attr,41 char *buf)42{43 struct zcrypt_queue *zq = dev_get_drvdata(dev);44 struct ap_queue *aq = to_ap_queue(dev);45 int online = aq->config && !aq->chkstop && zq->online ? 1 : 0;46 47 return sysfs_emit(buf, "%d\n", online);48}49 50static ssize_t online_store(struct device *dev,51 struct device_attribute *attr,52 const char *buf, size_t count)53{54 struct zcrypt_queue *zq = dev_get_drvdata(dev);55 struct ap_queue *aq = to_ap_queue(dev);56 struct zcrypt_card *zc = zq->zcard;57 int online;58 59 if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)60 return -EINVAL;61 62 if (online && (!aq->config || !aq->card->config ||63 aq->chkstop || aq->card->chkstop))64 return -ENODEV;65 if (online && !zc->online)66 return -EINVAL;67 zq->online = online;68 69 ZCRYPT_DBF_INFO("%s queue=%02x.%04x online=%d\n",70 __func__, AP_QID_CARD(zq->queue->qid),71 AP_QID_QUEUE(zq->queue->qid), online);72 73 ap_send_online_uevent(&aq->ap_dev, online);74 75 if (!online)76 ap_flush_queue(zq->queue);77 return count;78}79 80static DEVICE_ATTR_RW(online);81 82static ssize_t load_show(struct device *dev,83 struct device_attribute *attr,84 char *buf)85{86 struct zcrypt_queue *zq = dev_get_drvdata(dev);87 88 return sysfs_emit(buf, "%d\n", atomic_read(&zq->load));89}90 91static DEVICE_ATTR_RO(load);92 93static struct attribute *zcrypt_queue_attrs[] = {94 &dev_attr_online.attr,95 &dev_attr_load.attr,96 NULL,97};98 99static const struct attribute_group zcrypt_queue_attr_group = {100 .attrs = zcrypt_queue_attrs,101};102 103bool zcrypt_queue_force_online(struct zcrypt_queue *zq, int online)104{105 if (!!zq->online != !!online) {106 zq->online = online;107 if (!online)108 ap_flush_queue(zq->queue);109 return true;110 }111 return false;112}113 114struct zcrypt_queue *zcrypt_queue_alloc(size_t reply_buf_size)115{116 struct zcrypt_queue *zq;117 118 zq = kzalloc(sizeof(*zq), GFP_KERNEL);119 if (!zq)120 return NULL;121 zq->reply.msg = kmalloc(reply_buf_size, GFP_KERNEL);122 if (!zq->reply.msg)123 goto out_free;124 zq->reply.bufsize = reply_buf_size;125 INIT_LIST_HEAD(&zq->list);126 kref_init(&zq->refcount);127 return zq;128 129out_free:130 kfree(zq);131 return NULL;132}133EXPORT_SYMBOL(zcrypt_queue_alloc);134 135void zcrypt_queue_free(struct zcrypt_queue *zq)136{137 kfree(zq->reply.msg);138 kfree(zq);139}140EXPORT_SYMBOL(zcrypt_queue_free);141 142static void zcrypt_queue_release(struct kref *kref)143{144 struct zcrypt_queue *zq =145 container_of(kref, struct zcrypt_queue, refcount);146 zcrypt_queue_free(zq);147}148 149void zcrypt_queue_get(struct zcrypt_queue *zq)150{151 kref_get(&zq->refcount);152}153EXPORT_SYMBOL(zcrypt_queue_get);154 155int zcrypt_queue_put(struct zcrypt_queue *zq)156{157 return kref_put(&zq->refcount, zcrypt_queue_release);158}159EXPORT_SYMBOL(zcrypt_queue_put);160 161/**162 * zcrypt_queue_register() - Register a crypto queue device.163 * @zq: Pointer to a crypto queue device164 *165 * Register a crypto queue device. Returns 0 if successful.166 */167int zcrypt_queue_register(struct zcrypt_queue *zq)168{169 struct zcrypt_card *zc;170 int rc;171 172 spin_lock(&zcrypt_list_lock);173 zc = dev_get_drvdata(&zq->queue->card->ap_dev.device);174 zcrypt_card_get(zc);175 zq->zcard = zc;176 zq->online = 1; /* New devices are online by default. */177 178 ZCRYPT_DBF_INFO("%s queue=%02x.%04x register online=1\n",179 __func__, AP_QID_CARD(zq->queue->qid),180 AP_QID_QUEUE(zq->queue->qid));181 182 list_add_tail(&zq->list, &zc->zqueues);183 spin_unlock(&zcrypt_list_lock);184 185 rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj,186 &zcrypt_queue_attr_group);187 if (rc)188 goto out;189 190 if (zq->ops->rng) {191 rc = zcrypt_rng_device_add();192 if (rc)193 goto out_unregister;194 }195 return 0;196 197out_unregister:198 sysfs_remove_group(&zq->queue->ap_dev.device.kobj,199 &zcrypt_queue_attr_group);200out:201 spin_lock(&zcrypt_list_lock);202 list_del_init(&zq->list);203 spin_unlock(&zcrypt_list_lock);204 zcrypt_card_put(zc);205 return rc;206}207EXPORT_SYMBOL(zcrypt_queue_register);208 209/**210 * zcrypt_queue_unregister(): Unregister a crypto queue device.211 * @zq: Pointer to crypto queue device212 *213 * Unregister a crypto queue device.214 */215void zcrypt_queue_unregister(struct zcrypt_queue *zq)216{217 struct zcrypt_card *zc;218 219 ZCRYPT_DBF_INFO("%s queue=%02x.%04x unregister\n",220 __func__, AP_QID_CARD(zq->queue->qid),221 AP_QID_QUEUE(zq->queue->qid));222 223 zc = zq->zcard;224 spin_lock(&zcrypt_list_lock);225 list_del_init(&zq->list);226 spin_unlock(&zcrypt_list_lock);227 if (zq->ops->rng)228 zcrypt_rng_device_remove();229 sysfs_remove_group(&zq->queue->ap_dev.device.kobj,230 &zcrypt_queue_attr_group);231 zcrypt_card_put(zc);232 zcrypt_queue_put(zq);233}234EXPORT_SYMBOL(zcrypt_queue_unregister);235