diff options
Diffstat (limited to 'drivers/s390/crypto/zcrypt_card.c')
| -rw-r--r-- | drivers/s390/crypto/zcrypt_card.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/drivers/s390/crypto/zcrypt_card.c b/drivers/s390/crypto/zcrypt_card.c new file mode 100644 index 000000000..6ca675042 --- /dev/null +++ b/drivers/s390/crypto/zcrypt_card.c @@ -0,0 +1,225 @@ +// 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 = dev_get_drvdata(dev); + + 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 zcrypt_card *zc = dev_get_drvdata(dev); + struct ap_card *ac = to_ap_card(dev); + 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 zcrypt_card *zc = dev_get_drvdata(dev); + struct ap_card *ac = to_ap_card(dev); + struct zcrypt_queue *zq; + int online, id, i = 0, maxzqs = 0; + struct zcrypt_queue **zq_uelist = NULL; + + 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_INFO("%s card=%02x online=%d\n", __func__, id, online); + + ap_send_online_uevent(&ac->ap_dev, online); + + spin_lock(&zcrypt_list_lock); + /* + * As we are in atomic context here, directly sending uevents + * does not work. So collect the zqueues in a dynamic array + * and process them after zcrypt_list_lock release. As we get/put + * the zqueue objects, we make sure they exist after lock release. + */ + list_for_each_entry(zq, &zc->zqueues, list) + maxzqs++; + if (maxzqs > 0) + zq_uelist = kcalloc(maxzqs + 1, sizeof(*zq_uelist), GFP_ATOMIC); + list_for_each_entry(zq, &zc->zqueues, list) + if (zcrypt_queue_force_online(zq, online)) + if (zq_uelist) { + zcrypt_queue_get(zq); + zq_uelist[i++] = zq; + } + spin_unlock(&zcrypt_list_lock); + if (zq_uelist) { + for (i = 0; zq_uelist[i]; i++) { + zq = zq_uelist[i]; + ap_send_online_uevent(&zq->queue->ap_dev, online); + zcrypt_queue_put(zq); + } + kfree(zq_uelist); + } + + 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 = dev_get_drvdata(dev); + + 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(*zc), 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_INFO("%s card=%02x register online=1\n", + __func__, 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_INFO("%s card=%02x unregister\n", + __func__, 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); |