265 lines
7.1 KiB
C
265 lines
7.1 KiB
C
/* Management for virtio crypto devices (refer to adf_dev_mgr.c)
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*
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* Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <uapi/linux/virtio_crypto.h>
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#include "virtio_crypto_common.h"
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static LIST_HEAD(virtio_crypto_table);
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static uint32_t num_devices;
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/* The table_lock protects the above global list and num_devices */
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static DEFINE_MUTEX(table_lock);
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#define VIRTIO_CRYPTO_MAX_DEVICES 32
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/*
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* virtcrypto_devmgr_add_dev() - Add vcrypto_dev to the acceleration
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* framework.
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* @vcrypto_dev: Pointer to virtio crypto device.
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*
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* Function adds virtio crypto device to the global list.
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* To be used by virtio crypto device specific drivers.
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*
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* Return: 0 on success, error code othewise.
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*/
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int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev)
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{
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struct list_head *itr;
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mutex_lock(&table_lock);
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if (num_devices == VIRTIO_CRYPTO_MAX_DEVICES) {
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pr_info("virtio_crypto: only support up to %d devices\n",
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VIRTIO_CRYPTO_MAX_DEVICES);
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mutex_unlock(&table_lock);
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return -EFAULT;
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}
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list_for_each(itr, &virtio_crypto_table) {
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struct virtio_crypto *ptr =
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list_entry(itr, struct virtio_crypto, list);
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if (ptr == vcrypto_dev) {
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mutex_unlock(&table_lock);
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return -EEXIST;
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}
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}
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atomic_set(&vcrypto_dev->ref_count, 0);
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list_add_tail(&vcrypto_dev->list, &virtio_crypto_table);
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vcrypto_dev->dev_id = num_devices++;
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mutex_unlock(&table_lock);
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return 0;
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}
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struct list_head *virtcrypto_devmgr_get_head(void)
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{
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return &virtio_crypto_table;
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}
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/*
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* virtcrypto_devmgr_rm_dev() - Remove vcrypto_dev from the acceleration
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* framework.
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* @vcrypto_dev: Pointer to virtio crypto device.
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*
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* Function removes virtio crypto device from the acceleration framework.
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* To be used by virtio crypto device specific drivers.
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*
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* Return: void
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*/
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void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev)
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{
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mutex_lock(&table_lock);
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list_del(&vcrypto_dev->list);
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num_devices--;
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mutex_unlock(&table_lock);
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}
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/*
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* virtcrypto_devmgr_get_first()
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*
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* Function returns the first virtio crypto device from the acceleration
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* framework.
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*
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* To be used by virtio crypto device specific drivers.
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*
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* Return: pointer to vcrypto_dev or NULL if not found.
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*/
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struct virtio_crypto *virtcrypto_devmgr_get_first(void)
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{
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struct virtio_crypto *dev = NULL;
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mutex_lock(&table_lock);
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if (!list_empty(&virtio_crypto_table))
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dev = list_first_entry(&virtio_crypto_table,
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struct virtio_crypto,
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list);
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mutex_unlock(&table_lock);
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return dev;
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}
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/*
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* virtcrypto_dev_in_use() - Check whether vcrypto_dev is currently in use
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* @vcrypto_dev: Pointer to virtio crypto device.
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*
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* To be used by virtio crypto device specific drivers.
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*
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* Return: 1 when device is in use, 0 otherwise.
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*/
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int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev)
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{
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return atomic_read(&vcrypto_dev->ref_count) != 0;
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}
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/*
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* virtcrypto_dev_get() - Increment vcrypto_dev reference count
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* @vcrypto_dev: Pointer to virtio crypto device.
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*
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* Increment the vcrypto_dev refcount and if this is the first time
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* incrementing it during this period the vcrypto_dev is in use,
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* increment the module refcount too.
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* To be used by virtio crypto device specific drivers.
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*
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* Return: 0 when successful, EFAULT when fail to bump module refcount
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*/
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int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev)
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{
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if (atomic_add_return(1, &vcrypto_dev->ref_count) == 1)
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if (!try_module_get(vcrypto_dev->owner))
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return -EFAULT;
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return 0;
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}
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/*
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* virtcrypto_dev_put() - Decrement vcrypto_dev reference count
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* @vcrypto_dev: Pointer to virtio crypto device.
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*
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* Decrement the vcrypto_dev refcount and if this is the last time
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* decrementing it during this period the vcrypto_dev is in use,
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* decrement the module refcount too.
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* To be used by virtio crypto device specific drivers.
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*
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* Return: void
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*/
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void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev)
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{
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if (atomic_sub_return(1, &vcrypto_dev->ref_count) == 0)
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module_put(vcrypto_dev->owner);
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}
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/*
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* virtcrypto_dev_started() - Check whether device has started
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* @vcrypto_dev: Pointer to virtio crypto device.
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*
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* To be used by virtio crypto device specific drivers.
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*
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* Return: 1 when the device has started, 0 otherwise
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*/
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int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev)
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{
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return (vcrypto_dev->status & VIRTIO_CRYPTO_S_HW_READY);
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}
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/*
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* virtcrypto_get_dev_node() - Get vcrypto_dev on the node.
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* @node: Node id the driver works.
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*
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* Function returns the virtio crypto device used fewest on the node.
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*
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* To be used by virtio crypto device specific drivers.
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*
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* Return: pointer to vcrypto_dev or NULL if not found.
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*/
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struct virtio_crypto *virtcrypto_get_dev_node(int node)
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{
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struct virtio_crypto *vcrypto_dev = NULL, *tmp_dev;
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unsigned long best = ~0;
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unsigned long ctr;
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mutex_lock(&table_lock);
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list_for_each_entry(tmp_dev, virtcrypto_devmgr_get_head(), list) {
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if ((node == dev_to_node(&tmp_dev->vdev->dev) ||
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dev_to_node(&tmp_dev->vdev->dev) < 0) &&
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virtcrypto_dev_started(tmp_dev)) {
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ctr = atomic_read(&tmp_dev->ref_count);
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if (best > ctr) {
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vcrypto_dev = tmp_dev;
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best = ctr;
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}
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}
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}
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if (!vcrypto_dev) {
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pr_info("virtio_crypto: Could not find a device on node %d\n",
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node);
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/* Get any started device */
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list_for_each_entry(tmp_dev,
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virtcrypto_devmgr_get_head(), list) {
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if (virtcrypto_dev_started(tmp_dev)) {
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vcrypto_dev = tmp_dev;
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break;
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}
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}
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}
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mutex_unlock(&table_lock);
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if (!vcrypto_dev)
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return NULL;
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virtcrypto_dev_get(vcrypto_dev);
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return vcrypto_dev;
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}
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/*
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* virtcrypto_dev_start() - Start virtio crypto device
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* @vcrypto: Pointer to virtio crypto device.
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*
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* Function notifies all the registered services that the virtio crypto device
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* is ready to be used.
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* To be used by virtio crypto device specific drivers.
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*
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* Return: 0 on success, EFAULT when fail to register algorithms
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*/
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int virtcrypto_dev_start(struct virtio_crypto *vcrypto)
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{
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if (virtio_crypto_algs_register()) {
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pr_err("virtio_crypto: Failed to register crypto algs\n");
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return -EFAULT;
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}
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return 0;
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}
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/*
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* virtcrypto_dev_stop() - Stop virtio crypto device
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* @vcrypto: Pointer to virtio crypto device.
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*
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* Function notifies all the registered services that the virtio crypto device
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* is ready to be used.
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* To be used by virtio crypto device specific drivers.
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*
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* Return: void
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*/
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void virtcrypto_dev_stop(struct virtio_crypto *vcrypto)
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{
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virtio_crypto_algs_unregister();
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}
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