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197 lines
4.6 KiB
197 lines
4.6 KiB
// 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 ([email protected]) |
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* Cornelia Huck <[email protected]> |
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* |
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* Hotplug & misc device support: Jochen Roehrig ([email protected]) |
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* Major cleanup & driver split: Martin Schwidefsky <[email protected]> |
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* Ralph Wuerthner <[email protected]> |
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* MSGTYPE restruct: Holger Dengler <[email protected]> |
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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 card devices. |
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*/ |
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static ssize_t type_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct zcrypt_card *zc = to_ap_card(dev)->private; |
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return scnprintf(buf, PAGE_SIZE, "%s\n", zc->type_string); |
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} |
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static DEVICE_ATTR_RO(type); |
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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 ap_card *ac = to_ap_card(dev); |
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struct zcrypt_card *zc = ac->private; |
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int online = ac->config && zc->online ? 1 : 0; |
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return scnprintf(buf, PAGE_SIZE, "%d\n", 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 ap_card *ac = to_ap_card(dev); |
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struct zcrypt_card *zc = ac->private; |
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struct zcrypt_queue *zq; |
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int online, id; |
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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 && !ac->config) |
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return -ENODEV; |
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zc->online = online; |
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id = zc->card->id; |
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ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online); |
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spin_lock(&zcrypt_list_lock); |
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list_for_each_entry(zq, &zc->zqueues, list) |
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zcrypt_queue_force_online(zq, online); |
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spin_unlock(&zcrypt_list_lock); |
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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_card *zc = to_ap_card(dev)->private; |
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return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zc->load)); |
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} |
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static DEVICE_ATTR_RO(load); |
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static struct attribute *zcrypt_card_attrs[] = { |
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&dev_attr_type.attr, |
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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_card_attr_group = { |
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.attrs = zcrypt_card_attrs, |
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}; |
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struct zcrypt_card *zcrypt_card_alloc(void) |
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{ |
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struct zcrypt_card *zc; |
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zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL); |
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if (!zc) |
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return NULL; |
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INIT_LIST_HEAD(&zc->list); |
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INIT_LIST_HEAD(&zc->zqueues); |
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kref_init(&zc->refcount); |
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return zc; |
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} |
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EXPORT_SYMBOL(zcrypt_card_alloc); |
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void zcrypt_card_free(struct zcrypt_card *zc) |
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{ |
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kfree(zc); |
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} |
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EXPORT_SYMBOL(zcrypt_card_free); |
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static void zcrypt_card_release(struct kref *kref) |
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{ |
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struct zcrypt_card *zdev = |
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container_of(kref, struct zcrypt_card, refcount); |
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zcrypt_card_free(zdev); |
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} |
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void zcrypt_card_get(struct zcrypt_card *zc) |
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{ |
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kref_get(&zc->refcount); |
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} |
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EXPORT_SYMBOL(zcrypt_card_get); |
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int zcrypt_card_put(struct zcrypt_card *zc) |
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{ |
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return kref_put(&zc->refcount, zcrypt_card_release); |
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} |
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EXPORT_SYMBOL(zcrypt_card_put); |
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/** |
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* zcrypt_card_register() - Register a crypto card device. |
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* @zc: Pointer to a crypto card device |
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* |
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* Register a crypto card device. Returns 0 if successful. |
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*/ |
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int zcrypt_card_register(struct zcrypt_card *zc) |
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{ |
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int rc; |
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spin_lock(&zcrypt_list_lock); |
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list_add_tail(&zc->list, &zcrypt_card_list); |
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spin_unlock(&zcrypt_list_lock); |
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zc->online = 1; |
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ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id); |
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rc = sysfs_create_group(&zc->card->ap_dev.device.kobj, |
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&zcrypt_card_attr_group); |
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if (rc) { |
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spin_lock(&zcrypt_list_lock); |
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list_del_init(&zc->list); |
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spin_unlock(&zcrypt_list_lock); |
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} |
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return rc; |
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} |
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EXPORT_SYMBOL(zcrypt_card_register); |
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/** |
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* zcrypt_card_unregister(): Unregister a crypto card device. |
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* @zc: Pointer to crypto card device |
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* |
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* Unregister a crypto card device. |
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*/ |
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void zcrypt_card_unregister(struct zcrypt_card *zc) |
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{ |
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ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id); |
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spin_lock(&zcrypt_list_lock); |
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list_del_init(&zc->list); |
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spin_unlock(&zcrypt_list_lock); |
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sysfs_remove_group(&zc->card->ap_dev.device.kobj, |
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&zcrypt_card_attr_group); |
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zcrypt_card_put(zc); |
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} |
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EXPORT_SYMBOL(zcrypt_card_unregister);
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