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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 card devices.37 */38 39static ssize_t type_show(struct device *dev,40 struct device_attribute *attr, char *buf)41{42 struct zcrypt_card *zc = dev_get_drvdata(dev);43 44 return sysfs_emit(buf, "%s\n", zc->type_string);45}46 47static DEVICE_ATTR_RO(type);48 49static ssize_t online_show(struct device *dev,50 struct device_attribute *attr,51 char *buf)52{53 struct zcrypt_card *zc = dev_get_drvdata(dev);54 struct ap_card *ac = to_ap_card(dev);55 int online = ac->config && !ac->chkstop && zc->online ? 1 : 0;56 57 return sysfs_emit(buf, "%d\n", online);58}59 60static ssize_t online_store(struct device *dev,61 struct device_attribute *attr,62 const char *buf, size_t count)63{64 struct zcrypt_card *zc = dev_get_drvdata(dev);65 struct ap_card *ac = to_ap_card(dev);66 struct zcrypt_queue *zq;67 int online, id, i = 0, maxzqs = 0;68 struct zcrypt_queue **zq_uelist = NULL;69 70 if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)71 return -EINVAL;72 73 if (online && (!ac->config || ac->chkstop))74 return -ENODEV;75 76 zc->online = online;77 id = zc->card->id;78 79 ZCRYPT_DBF_INFO("%s card=%02x online=%d\n", __func__, id, online);80 81 ap_send_online_uevent(&ac->ap_dev, online);82 83 spin_lock(&zcrypt_list_lock);84 /*85 * As we are in atomic context here, directly sending uevents86 * does not work. So collect the zqueues in a dynamic array87 * and process them after zcrypt_list_lock release. As we get/put88 * the zqueue objects, we make sure they exist after lock release.89 */90 list_for_each_entry(zq, &zc->zqueues, list)91 maxzqs++;92 if (maxzqs > 0)93 zq_uelist = kcalloc(maxzqs + 1, sizeof(*zq_uelist), GFP_ATOMIC);94 list_for_each_entry(zq, &zc->zqueues, list)95 if (zcrypt_queue_force_online(zq, online))96 if (zq_uelist) {97 zcrypt_queue_get(zq);98 zq_uelist[i++] = zq;99 }100 spin_unlock(&zcrypt_list_lock);101 if (zq_uelist) {102 for (i = 0; zq_uelist[i]; i++) {103 zq = zq_uelist[i];104 ap_send_online_uevent(&zq->queue->ap_dev, online);105 zcrypt_queue_put(zq);106 }107 kfree(zq_uelist);108 }109 110 return count;111}112 113static DEVICE_ATTR_RW(online);114 115static ssize_t load_show(struct device *dev,116 struct device_attribute *attr,117 char *buf)118{119 struct zcrypt_card *zc = dev_get_drvdata(dev);120 121 return sysfs_emit(buf, "%d\n", atomic_read(&zc->load));122}123 124static DEVICE_ATTR_RO(load);125 126static struct attribute *zcrypt_card_attrs[] = {127 &dev_attr_type.attr,128 &dev_attr_online.attr,129 &dev_attr_load.attr,130 NULL,131};132 133static const struct attribute_group zcrypt_card_attr_group = {134 .attrs = zcrypt_card_attrs,135};136 137struct zcrypt_card *zcrypt_card_alloc(void)138{139 struct zcrypt_card *zc;140 141 zc = kzalloc(sizeof(*zc), GFP_KERNEL);142 if (!zc)143 return NULL;144 INIT_LIST_HEAD(&zc->list);145 INIT_LIST_HEAD(&zc->zqueues);146 kref_init(&zc->refcount);147 return zc;148}149EXPORT_SYMBOL(zcrypt_card_alloc);150 151void zcrypt_card_free(struct zcrypt_card *zc)152{153 kfree(zc);154}155EXPORT_SYMBOL(zcrypt_card_free);156 157static void zcrypt_card_release(struct kref *kref)158{159 struct zcrypt_card *zdev =160 container_of(kref, struct zcrypt_card, refcount);161 zcrypt_card_free(zdev);162}163 164void zcrypt_card_get(struct zcrypt_card *zc)165{166 kref_get(&zc->refcount);167}168EXPORT_SYMBOL(zcrypt_card_get);169 170int zcrypt_card_put(struct zcrypt_card *zc)171{172 return kref_put(&zc->refcount, zcrypt_card_release);173}174EXPORT_SYMBOL(zcrypt_card_put);175 176/**177 * zcrypt_card_register() - Register a crypto card device.178 * @zc: Pointer to a crypto card device179 *180 * Register a crypto card device. Returns 0 if successful.181 */182int zcrypt_card_register(struct zcrypt_card *zc)183{184 int rc;185 186 spin_lock(&zcrypt_list_lock);187 list_add_tail(&zc->list, &zcrypt_card_list);188 spin_unlock(&zcrypt_list_lock);189 190 zc->online = 1;191 192 ZCRYPT_DBF_INFO("%s card=%02x register online=1\n",193 __func__, zc->card->id);194 195 rc = sysfs_create_group(&zc->card->ap_dev.device.kobj,196 &zcrypt_card_attr_group);197 if (rc) {198 spin_lock(&zcrypt_list_lock);199 list_del_init(&zc->list);200 spin_unlock(&zcrypt_list_lock);201 }202 203 return rc;204}205EXPORT_SYMBOL(zcrypt_card_register);206 207/**208 * zcrypt_card_unregister(): Unregister a crypto card device.209 * @zc: Pointer to crypto card device210 *211 * Unregister a crypto card device.212 */213void zcrypt_card_unregister(struct zcrypt_card *zc)214{215 ZCRYPT_DBF_INFO("%s card=%02x unregister\n",216 __func__, zc->card->id);217 218 spin_lock(&zcrypt_list_lock);219 list_del_init(&zc->list);220 spin_unlock(&zcrypt_list_lock);221 sysfs_remove_group(&zc->card->ap_dev.device.kobj,222 &zcrypt_card_attr_group);223 zcrypt_card_put(zc);224}225EXPORT_SYMBOL(zcrypt_card_unregister);226