// 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/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/compat.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 card devices. */ static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf) { struct zcrypt_card *zc = to_ap_card(dev)->private; return scnprintf(buf, PAGE_SIZE, "%s\n", zc->type_string); } static DEVICE_ATTR_RO(type); static ssize_t online_show(struct device *dev, struct device_attribute *attr, char *buf) { struct ap_card *ac = to_ap_card(dev); struct zcrypt_card *zc = ac->private; int online = ac->config && zc->online ? 1 : 0; return scnprintf(buf, PAGE_SIZE, "%d\n", online); } static ssize_t online_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct ap_card *ac = to_ap_card(dev); struct zcrypt_card *zc = ac->private; struct zcrypt_queue *zq; int online, id; if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1) return -EINVAL; if (online && !ac->config) return -ENODEV; zc->online = online; id = zc->card->id; ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online); spin_lock(&zcrypt_list_lock); list_for_each_entry(zq, &zc->zqueues, list) zcrypt_queue_force_online(zq, online); spin_unlock(&zcrypt_list_lock); return count; } static DEVICE_ATTR_RW(online); static ssize_t load_show(struct device *dev, struct device_attribute *attr, char *buf) { struct zcrypt_card *zc = to_ap_card(dev)->private; return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zc->load)); } static DEVICE_ATTR_RO(load); static struct attribute *zcrypt_card_attrs[] = { &dev_attr_type.attr, &dev_attr_online.attr, &dev_attr_load.attr, NULL, }; static const struct attribute_group zcrypt_card_attr_group = { .attrs = zcrypt_card_attrs, }; struct zcrypt_card *zcrypt_card_alloc(void) { struct zcrypt_card *zc; zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL); if (!zc) return NULL; INIT_LIST_HEAD(&zc->list); INIT_LIST_HEAD(&zc->zqueues); kref_init(&zc->refcount); return zc; } EXPORT_SYMBOL(zcrypt_card_alloc); void zcrypt_card_free(struct zcrypt_card *zc) { kfree(zc); } EXPORT_SYMBOL(zcrypt_card_free); static void zcrypt_card_release(struct kref *kref) { struct zcrypt_card *zdev = container_of(kref, struct zcrypt_card, refcount); zcrypt_card_free(zdev); } void zcrypt_card_get(struct zcrypt_card *zc) { kref_get(&zc->refcount); } EXPORT_SYMBOL(zcrypt_card_get); int zcrypt_card_put(struct zcrypt_card *zc) { return kref_put(&zc->refcount, zcrypt_card_release); } EXPORT_SYMBOL(zcrypt_card_put); /** * zcrypt_card_register() - Register a crypto card device. * @zc: Pointer to a crypto card device * * Register a crypto card device. Returns 0 if successful. */ int zcrypt_card_register(struct zcrypt_card *zc) { int rc; spin_lock(&zcrypt_list_lock); list_add_tail(&zc->list, &zcrypt_card_list); spin_unlock(&zcrypt_list_lock); zc->online = 1; ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id); rc = sysfs_create_group(&zc->card->ap_dev.device.kobj, &zcrypt_card_attr_group); if (rc) { spin_lock(&zcrypt_list_lock); list_del_init(&zc->list); spin_unlock(&zcrypt_list_lock); } return rc; } EXPORT_SYMBOL(zcrypt_card_register); /** * zcrypt_card_unregister(): Unregister a crypto card device. * @zc: Pointer to crypto card device * * Unregister a crypto card device. */ void zcrypt_card_unregister(struct zcrypt_card *zc) { ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id); spin_lock(&zcrypt_list_lock); list_del_init(&zc->list); spin_unlock(&zcrypt_list_lock); sysfs_remove_group(&zc->card->ap_dev.device.kobj, &zcrypt_card_attr_group); zcrypt_card_put(zc); } EXPORT_SYMBOL(zcrypt_card_unregister);