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228 lines
5.3 KiB
228 lines
5.3 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 queue devices. |
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*/ |
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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_queue *aq = to_ap_queue(dev); |
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struct zcrypt_queue *zq = aq->private; |
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int online = aq->config && zq->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_queue *aq = to_ap_queue(dev); |
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struct zcrypt_queue *zq = aq->private; |
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struct zcrypt_card *zc = zq->zcard; |
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int online; |
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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 && (!aq->config || !aq->card->config)) |
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return -ENODEV; |
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if (online && !zc->online) |
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return -EINVAL; |
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zq->online = online; |
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ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x online=%d\n", |
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AP_QID_CARD(zq->queue->qid), |
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AP_QID_QUEUE(zq->queue->qid), |
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online); |
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if (!online) |
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ap_flush_queue(zq->queue); |
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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_queue *zq = to_ap_queue(dev)->private; |
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return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zq->load)); |
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} |
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static DEVICE_ATTR_RO(load); |
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static struct attribute *zcrypt_queue_attrs[] = { |
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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_queue_attr_group = { |
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.attrs = zcrypt_queue_attrs, |
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}; |
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void zcrypt_queue_force_online(struct zcrypt_queue *zq, int online) |
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{ |
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zq->online = online; |
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if (!online) |
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ap_flush_queue(zq->queue); |
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} |
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struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_size) |
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{ |
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struct zcrypt_queue *zq; |
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zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL); |
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if (!zq) |
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return NULL; |
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zq->reply.msg = kmalloc(max_response_size, GFP_KERNEL); |
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if (!zq->reply.msg) |
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goto out_free; |
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zq->reply.len = max_response_size; |
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INIT_LIST_HEAD(&zq->list); |
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kref_init(&zq->refcount); |
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return zq; |
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out_free: |
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kfree(zq); |
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return NULL; |
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} |
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EXPORT_SYMBOL(zcrypt_queue_alloc); |
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void zcrypt_queue_free(struct zcrypt_queue *zq) |
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{ |
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kfree(zq->reply.msg); |
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kfree(zq); |
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} |
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EXPORT_SYMBOL(zcrypt_queue_free); |
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static void zcrypt_queue_release(struct kref *kref) |
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{ |
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struct zcrypt_queue *zq = |
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container_of(kref, struct zcrypt_queue, refcount); |
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zcrypt_queue_free(zq); |
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} |
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void zcrypt_queue_get(struct zcrypt_queue *zq) |
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{ |
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kref_get(&zq->refcount); |
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} |
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EXPORT_SYMBOL(zcrypt_queue_get); |
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int zcrypt_queue_put(struct zcrypt_queue *zq) |
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{ |
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return kref_put(&zq->refcount, zcrypt_queue_release); |
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} |
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EXPORT_SYMBOL(zcrypt_queue_put); |
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/** |
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* zcrypt_queue_register() - Register a crypto queue device. |
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* @zq: Pointer to a crypto queue device |
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* |
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* Register a crypto queue device. Returns 0 if successful. |
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*/ |
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int zcrypt_queue_register(struct zcrypt_queue *zq) |
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{ |
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struct zcrypt_card *zc; |
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int rc; |
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spin_lock(&zcrypt_list_lock); |
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zc = zq->queue->card->private; |
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zcrypt_card_get(zc); |
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zq->zcard = zc; |
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zq->online = 1; /* New devices are online by default. */ |
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ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x register online=1\n", |
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AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); |
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list_add_tail(&zq->list, &zc->zqueues); |
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zcrypt_device_count++; |
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spin_unlock(&zcrypt_list_lock); |
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rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj, |
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&zcrypt_queue_attr_group); |
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if (rc) |
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goto out; |
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if (zq->ops->rng) { |
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rc = zcrypt_rng_device_add(); |
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if (rc) |
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goto out_unregister; |
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} |
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return 0; |
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out_unregister: |
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sysfs_remove_group(&zq->queue->ap_dev.device.kobj, |
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&zcrypt_queue_attr_group); |
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out: |
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spin_lock(&zcrypt_list_lock); |
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list_del_init(&zq->list); |
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spin_unlock(&zcrypt_list_lock); |
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zcrypt_card_put(zc); |
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return rc; |
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} |
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EXPORT_SYMBOL(zcrypt_queue_register); |
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/** |
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* zcrypt_queue_unregister(): Unregister a crypto queue device. |
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* @zq: Pointer to crypto queue device |
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* |
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* Unregister a crypto queue device. |
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*/ |
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void zcrypt_queue_unregister(struct zcrypt_queue *zq) |
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{ |
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struct zcrypt_card *zc; |
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ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x unregister\n", |
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AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); |
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zc = zq->zcard; |
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spin_lock(&zcrypt_list_lock); |
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list_del_init(&zq->list); |
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zcrypt_device_count--; |
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spin_unlock(&zcrypt_list_lock); |
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if (zq->ops->rng) |
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zcrypt_rng_device_remove(); |
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sysfs_remove_group(&zq->queue->ap_dev.device.kobj, |
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&zcrypt_queue_attr_group); |
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zcrypt_card_put(zc); |
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zcrypt_queue_put(zq); |
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} |
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EXPORT_SYMBOL(zcrypt_queue_unregister);
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