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/*
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* Crypto engine API
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*
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* Copyright (c) 2016 Baolin Wang <baolin.wang@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#ifndef _CRYPTO_ENGINE_H
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#define _CRYPTO_ENGINE_H
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#include <linux/crypto.h>
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#include <linux/list.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <crypto/algapi.h>
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#include <crypto/hash.h>
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#define ENGINE_NAME_LEN 30
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/*
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* struct crypto_engine - crypto hardware engine
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* @name: the engine name
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* @idling: the engine is entering idle state
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* @busy: request pump is busy
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* @running: the engine is on working
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* @cur_req_prepared: current request is prepared
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* @list: link with the global crypto engine list
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* @queue_lock: spinlock to syncronise access to request queue
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* @queue: the crypto queue of the engine
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* @rt: whether this queue is set to run as a realtime task
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* @prepare_crypt_hardware: a request will soon arrive from the queue
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* so the subsystem requests the driver to prepare the hardware
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* by issuing this call
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* @unprepare_crypt_hardware: there are currently no more requests on the
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* queue so the subsystem notifies the driver that it may relax the
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* hardware by issuing this call
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* @prepare_cipher_request: do some prepare if need before handle the current request
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* @unprepare_cipher_request: undo any work done by prepare_cipher_request()
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* @cipher_one_request: do encryption for current request
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* @prepare_hash_request: do some prepare if need before handle the current request
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* @unprepare_hash_request: undo any work done by prepare_hash_request()
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* @hash_one_request: do hash for current request
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* @kworker: kthread worker struct for request pump
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* @pump_requests: work struct for scheduling work to the request pump
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* @priv_data: the engine private data
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* @cur_req: the current request which is on processing
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*/
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struct crypto_engine {
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char name[ENGINE_NAME_LEN];
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bool idling;
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bool busy;
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bool running;
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bool cur_req_prepared;
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struct list_head list;
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spinlock_t queue_lock;
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struct crypto_queue queue;
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struct device *dev;
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bool rt;
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int (*prepare_crypt_hardware)(struct crypto_engine *engine);
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int (*unprepare_crypt_hardware)(struct crypto_engine *engine);
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int (*prepare_cipher_request)(struct crypto_engine *engine,
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struct ablkcipher_request *req);
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int (*unprepare_cipher_request)(struct crypto_engine *engine,
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struct ablkcipher_request *req);
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int (*prepare_hash_request)(struct crypto_engine *engine,
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struct ahash_request *req);
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int (*unprepare_hash_request)(struct crypto_engine *engine,
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struct ahash_request *req);
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int (*cipher_one_request)(struct crypto_engine *engine,
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struct ablkcipher_request *req);
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int (*hash_one_request)(struct crypto_engine *engine,
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struct ahash_request *req);
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struct kthread_worker *kworker;
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struct kthread_work pump_requests;
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void *priv_data;
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struct crypto_async_request *cur_req;
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};
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int crypto_transfer_cipher_request(struct crypto_engine *engine,
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struct ablkcipher_request *req,
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bool need_pump);
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int crypto_transfer_cipher_request_to_engine(struct crypto_engine *engine,
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struct ablkcipher_request *req);
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int crypto_transfer_hash_request(struct crypto_engine *engine,
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struct ahash_request *req, bool need_pump);
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int crypto_transfer_hash_request_to_engine(struct crypto_engine *engine,
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struct ahash_request *req);
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void crypto_finalize_cipher_request(struct crypto_engine *engine,
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struct ablkcipher_request *req, int err);
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void crypto_finalize_hash_request(struct crypto_engine *engine,
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struct ahash_request *req, int err);
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int crypto_engine_start(struct crypto_engine *engine);
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int crypto_engine_stop(struct crypto_engine *engine);
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struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt);
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int crypto_engine_exit(struct crypto_engine *engine);
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#endif /* _CRYPTO_ENGINE_H */
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