334 lines
8.6 KiB
C
334 lines
8.6 KiB
C
/* Management for virtio crypto devices (refer to adf_dev_mgr.c)
|
|
*
|
|
* Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/mutex.h>
|
|
#include <linux/list.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <uapi/linux/virtio_crypto.h>
|
|
#include "virtio_crypto_common.h"
|
|
|
|
static LIST_HEAD(virtio_crypto_table);
|
|
static uint32_t num_devices;
|
|
|
|
/* The table_lock protects the above global list and num_devices */
|
|
static DEFINE_MUTEX(table_lock);
|
|
|
|
#define VIRTIO_CRYPTO_MAX_DEVICES 32
|
|
|
|
|
|
/*
|
|
* virtcrypto_devmgr_add_dev() - Add vcrypto_dev to the acceleration
|
|
* framework.
|
|
* @vcrypto_dev: Pointer to virtio crypto device.
|
|
*
|
|
* Function adds virtio crypto device to the global list.
|
|
* To be used by virtio crypto device specific drivers.
|
|
*
|
|
* Return: 0 on success, error code othewise.
|
|
*/
|
|
int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev)
|
|
{
|
|
struct list_head *itr;
|
|
|
|
mutex_lock(&table_lock);
|
|
if (num_devices == VIRTIO_CRYPTO_MAX_DEVICES) {
|
|
pr_info("virtio_crypto: only support up to %d devices\n",
|
|
VIRTIO_CRYPTO_MAX_DEVICES);
|
|
mutex_unlock(&table_lock);
|
|
return -EFAULT;
|
|
}
|
|
|
|
list_for_each(itr, &virtio_crypto_table) {
|
|
struct virtio_crypto *ptr =
|
|
list_entry(itr, struct virtio_crypto, list);
|
|
|
|
if (ptr == vcrypto_dev) {
|
|
mutex_unlock(&table_lock);
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
atomic_set(&vcrypto_dev->ref_count, 0);
|
|
list_add_tail(&vcrypto_dev->list, &virtio_crypto_table);
|
|
vcrypto_dev->dev_id = num_devices++;
|
|
mutex_unlock(&table_lock);
|
|
return 0;
|
|
}
|
|
|
|
struct list_head *virtcrypto_devmgr_get_head(void)
|
|
{
|
|
return &virtio_crypto_table;
|
|
}
|
|
|
|
/*
|
|
* virtcrypto_devmgr_rm_dev() - Remove vcrypto_dev from the acceleration
|
|
* framework.
|
|
* @vcrypto_dev: Pointer to virtio crypto device.
|
|
*
|
|
* Function removes virtio crypto device from the acceleration framework.
|
|
* To be used by virtio crypto device specific drivers.
|
|
*
|
|
* Return: void
|
|
*/
|
|
void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev)
|
|
{
|
|
mutex_lock(&table_lock);
|
|
list_del(&vcrypto_dev->list);
|
|
num_devices--;
|
|
mutex_unlock(&table_lock);
|
|
}
|
|
|
|
/*
|
|
* virtcrypto_devmgr_get_first()
|
|
*
|
|
* Function returns the first virtio crypto device from the acceleration
|
|
* framework.
|
|
*
|
|
* To be used by virtio crypto device specific drivers.
|
|
*
|
|
* Return: pointer to vcrypto_dev or NULL if not found.
|
|
*/
|
|
struct virtio_crypto *virtcrypto_devmgr_get_first(void)
|
|
{
|
|
struct virtio_crypto *dev = NULL;
|
|
|
|
mutex_lock(&table_lock);
|
|
if (!list_empty(&virtio_crypto_table))
|
|
dev = list_first_entry(&virtio_crypto_table,
|
|
struct virtio_crypto,
|
|
list);
|
|
mutex_unlock(&table_lock);
|
|
return dev;
|
|
}
|
|
|
|
/*
|
|
* virtcrypto_dev_in_use() - Check whether vcrypto_dev is currently in use
|
|
* @vcrypto_dev: Pointer to virtio crypto device.
|
|
*
|
|
* To be used by virtio crypto device specific drivers.
|
|
*
|
|
* Return: 1 when device is in use, 0 otherwise.
|
|
*/
|
|
int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev)
|
|
{
|
|
return atomic_read(&vcrypto_dev->ref_count) != 0;
|
|
}
|
|
|
|
/*
|
|
* virtcrypto_dev_get() - Increment vcrypto_dev reference count
|
|
* @vcrypto_dev: Pointer to virtio crypto device.
|
|
*
|
|
* Increment the vcrypto_dev refcount and if this is the first time
|
|
* incrementing it during this period the vcrypto_dev is in use,
|
|
* increment the module refcount too.
|
|
* To be used by virtio crypto device specific drivers.
|
|
*
|
|
* Return: 0 when successful, EFAULT when fail to bump module refcount
|
|
*/
|
|
int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev)
|
|
{
|
|
if (atomic_add_return(1, &vcrypto_dev->ref_count) == 1)
|
|
if (!try_module_get(vcrypto_dev->owner))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* virtcrypto_dev_put() - Decrement vcrypto_dev reference count
|
|
* @vcrypto_dev: Pointer to virtio crypto device.
|
|
*
|
|
* Decrement the vcrypto_dev refcount and if this is the last time
|
|
* decrementing it during this period the vcrypto_dev is in use,
|
|
* decrement the module refcount too.
|
|
* To be used by virtio crypto device specific drivers.
|
|
*
|
|
* Return: void
|
|
*/
|
|
void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev)
|
|
{
|
|
if (atomic_sub_return(1, &vcrypto_dev->ref_count) == 0)
|
|
module_put(vcrypto_dev->owner);
|
|
}
|
|
|
|
/*
|
|
* virtcrypto_dev_started() - Check whether device has started
|
|
* @vcrypto_dev: Pointer to virtio crypto device.
|
|
*
|
|
* To be used by virtio crypto device specific drivers.
|
|
*
|
|
* Return: 1 when the device has started, 0 otherwise
|
|
*/
|
|
int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev)
|
|
{
|
|
return (vcrypto_dev->status & VIRTIO_CRYPTO_S_HW_READY);
|
|
}
|
|
|
|
/*
|
|
* virtcrypto_get_dev_node() - Get vcrypto_dev on the node.
|
|
* @node: Node id the driver works.
|
|
* @service: Crypto service that needs to be supported by the
|
|
* dev
|
|
* @algo: The algorithm number that needs to be supported by the
|
|
* dev
|
|
*
|
|
* Function returns the virtio crypto device used fewest on the node,
|
|
* and supports the given crypto service and algorithm.
|
|
*
|
|
* To be used by virtio crypto device specific drivers.
|
|
*
|
|
* Return: pointer to vcrypto_dev or NULL if not found.
|
|
*/
|
|
struct virtio_crypto *virtcrypto_get_dev_node(int node, uint32_t service,
|
|
uint32_t algo)
|
|
{
|
|
struct virtio_crypto *vcrypto_dev = NULL, *tmp_dev;
|
|
unsigned long best = ~0;
|
|
unsigned long ctr;
|
|
|
|
mutex_lock(&table_lock);
|
|
list_for_each_entry(tmp_dev, virtcrypto_devmgr_get_head(), list) {
|
|
|
|
if ((node == dev_to_node(&tmp_dev->vdev->dev) ||
|
|
dev_to_node(&tmp_dev->vdev->dev) < 0) &&
|
|
virtcrypto_dev_started(tmp_dev) &&
|
|
virtcrypto_algo_is_supported(tmp_dev, service, algo)) {
|
|
ctr = atomic_read(&tmp_dev->ref_count);
|
|
if (best > ctr) {
|
|
vcrypto_dev = tmp_dev;
|
|
best = ctr;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!vcrypto_dev) {
|
|
pr_info("virtio_crypto: Could not find a device on node %d\n",
|
|
node);
|
|
/* Get any started device */
|
|
list_for_each_entry(tmp_dev,
|
|
virtcrypto_devmgr_get_head(), list) {
|
|
if (virtcrypto_dev_started(tmp_dev) &&
|
|
virtcrypto_algo_is_supported(tmp_dev,
|
|
service, algo)) {
|
|
vcrypto_dev = tmp_dev;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
mutex_unlock(&table_lock);
|
|
if (!vcrypto_dev)
|
|
return NULL;
|
|
|
|
virtcrypto_dev_get(vcrypto_dev);
|
|
return vcrypto_dev;
|
|
}
|
|
|
|
/*
|
|
* virtcrypto_dev_start() - Start virtio crypto device
|
|
* @vcrypto: Pointer to virtio crypto device.
|
|
*
|
|
* Function notifies all the registered services that the virtio crypto device
|
|
* is ready to be used.
|
|
* To be used by virtio crypto device specific drivers.
|
|
*
|
|
* Return: 0 on success, EFAULT when fail to register algorithms
|
|
*/
|
|
int virtcrypto_dev_start(struct virtio_crypto *vcrypto)
|
|
{
|
|
if (virtio_crypto_algs_register(vcrypto)) {
|
|
pr_err("virtio_crypto: Failed to register crypto algs\n");
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* virtcrypto_dev_stop() - Stop virtio crypto device
|
|
* @vcrypto: Pointer to virtio crypto device.
|
|
*
|
|
* Function notifies all the registered services that the virtio crypto device
|
|
* is ready to be used.
|
|
* To be used by virtio crypto device specific drivers.
|
|
*
|
|
* Return: void
|
|
*/
|
|
void virtcrypto_dev_stop(struct virtio_crypto *vcrypto)
|
|
{
|
|
virtio_crypto_algs_unregister(vcrypto);
|
|
}
|
|
|
|
/*
|
|
* vcrypto_algo_is_supported()
|
|
* @vcrypto: Pointer to virtio crypto device.
|
|
* @service: The bit number for service validate.
|
|
* See VIRTIO_CRYPTO_SERVICE_*
|
|
* @algo : The bit number for the algorithm to validate.
|
|
*
|
|
*
|
|
* Validate if the virtio crypto device supports a service and
|
|
* algo.
|
|
*
|
|
* Return true if device supports a service and algo.
|
|
*/
|
|
|
|
bool virtcrypto_algo_is_supported(struct virtio_crypto *vcrypto,
|
|
uint32_t service,
|
|
uint32_t algo)
|
|
{
|
|
uint32_t service_mask = 1u << service;
|
|
uint32_t algo_mask = 0;
|
|
bool low = true;
|
|
|
|
if (algo > 31) {
|
|
algo -= 32;
|
|
low = false;
|
|
}
|
|
|
|
if (!(vcrypto->crypto_services & service_mask))
|
|
return false;
|
|
|
|
switch (service) {
|
|
case VIRTIO_CRYPTO_SERVICE_CIPHER:
|
|
if (low)
|
|
algo_mask = vcrypto->cipher_algo_l;
|
|
else
|
|
algo_mask = vcrypto->cipher_algo_h;
|
|
break;
|
|
|
|
case VIRTIO_CRYPTO_SERVICE_HASH:
|
|
algo_mask = vcrypto->hash_algo;
|
|
break;
|
|
|
|
case VIRTIO_CRYPTO_SERVICE_MAC:
|
|
if (low)
|
|
algo_mask = vcrypto->mac_algo_l;
|
|
else
|
|
algo_mask = vcrypto->mac_algo_h;
|
|
break;
|
|
|
|
case VIRTIO_CRYPTO_SERVICE_AEAD:
|
|
algo_mask = vcrypto->aead_algo;
|
|
break;
|
|
}
|
|
|
|
if (!(algo_mask & (1u << algo)))
|
|
return false;
|
|
|
|
return true;
|
|
}
|