linux/drivers/crypto/virtio/virtio_crypto_mgr.c

// SPDX-License-Identifier: GPL-2.0-or-later
 /* Management for virtio crypto devices (refer to adf_dev_mgr.c)
  *
  * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
  */

#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 …


/*
 * 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 *virtcrypto_devmgr_get_head(void)
{ … }

/*
 * 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)
{ … }

/*
 * 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)
{ … }

/*
 * 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)
{ … }

/*
 * 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)
{ … }

/*
 * 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)
{ … }

/*
 * 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)
{ … }

/*
 * 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)
{ … }

/*
 * 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)
{ … }

/*
 * 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)
{ … }

/*
 * 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)
{ … }