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/*
* Crypto engine API
*
* Copyright (c) 2016 Baolin Wang <baolin.wang@linaro.org>
*
* 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.
*
*/
#ifndef _CRYPTO_ENGINE_H
#define _CRYPTO_ENGINE_H
#include <linux/crypto.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <crypto/algapi.h>
#define ENGINE_NAME_LEN 30
/*
* struct crypto_engine - crypto hardware engine
* @name: the engine name
* @idling: the engine is entering idle state
* @busy: request pump is busy
* @running: the engine is on working
* @cur_req_prepared: current request is prepared
* @list: link with the global crypto engine list
* @queue_lock: spinlock to syncronise access to request queue
* @queue: the crypto queue of the engine
* @rt: whether this queue is set to run as a realtime task
* @prepare_crypt_hardware: a request will soon arrive from the queue
* so the subsystem requests the driver to prepare the hardware
* by issuing this call
* @unprepare_crypt_hardware: there are currently no more requests on the
* queue so the subsystem notifies the driver that it may relax the
* hardware by issuing this call
* @prepare_request: do some prepare if need before handle the current request
* @unprepare_request: undo any work done by prepare_message()
* @crypt_one_request: do encryption for current request
* @kworker: thread struct for request pump
* @kworker_task: pointer to task for request pump kworker thread
* @pump_requests: work struct for scheduling work to the request pump
* @priv_data: the engine private data
* @cur_req: the current request which is on processing
*/
struct crypto_engine {
char name[ENGINE_NAME_LEN];
bool idling;
bool busy;
bool running;
bool cur_req_prepared;
struct list_head list;
spinlock_t queue_lock;
struct crypto_queue queue;
bool rt;
int (*prepare_crypt_hardware)(struct crypto_engine *engine);
int (*unprepare_crypt_hardware)(struct crypto_engine *engine);
int (*prepare_request)(struct crypto_engine *engine,
struct ablkcipher_request *req);
int (*unprepare_request)(struct crypto_engine *engine,
struct ablkcipher_request *req);
int (*crypt_one_request)(struct crypto_engine *engine,
struct ablkcipher_request *req);
struct kthread_worker kworker;
struct task_struct *kworker_task;
struct kthread_work pump_requests;
void *priv_data;
struct ablkcipher_request *cur_req;
};
int crypto_transfer_request(struct crypto_engine *engine,
struct ablkcipher_request *req, bool need_pump);
int crypto_transfer_request_to_engine(struct crypto_engine *engine,
struct ablkcipher_request *req);
void crypto_finalize_request(struct crypto_engine *engine,
struct ablkcipher_request *req, int err);
int crypto_engine_start(struct crypto_engine *engine);
int crypto_engine_stop(struct crypto_engine *engine);
struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt);
int crypto_engine_exit(struct crypto_engine *engine);
#endif /* _CRYPTO_ENGINE_H */
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