/* * 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> #include <crypto/hash.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_cipher_request: do some prepare if need before handle the current request * @unprepare_cipher_request: undo any work done by prepare_cipher_request() * @cipher_one_request: do encryption for current request * @prepare_hash_request: do some prepare if need before handle the current request * @unprepare_hash_request: undo any work done by prepare_hash_request() * @hash_one_request: do hash 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_cipher_request)(struct crypto_engine *engine, struct ablkcipher_request *req); int (*unprepare_cipher_request)(struct crypto_engine *engine, struct ablkcipher_request *req); int (*prepare_hash_request)(struct crypto_engine *engine, struct ahash_request *req); int (*unprepare_hash_request)(struct crypto_engine *engine, struct ahash_request *req); int (*cipher_one_request)(struct crypto_engine *engine, struct ablkcipher_request *req); int (*hash_one_request)(struct crypto_engine *engine, struct ahash_request *req); struct kthread_worker kworker; struct task_struct *kworker_task; struct kthread_work pump_requests; void *priv_data; struct crypto_async_request *cur_req; }; int crypto_transfer_cipher_request(struct crypto_engine *engine, struct ablkcipher_request *req, bool need_pump); int crypto_transfer_cipher_request_to_engine(struct crypto_engine *engine, struct ablkcipher_request *req); int crypto_transfer_hash_request(struct crypto_engine *engine, struct ahash_request *req, bool need_pump); int crypto_transfer_hash_request_to_engine(struct crypto_engine *engine, struct ahash_request *req); void crypto_finalize_cipher_request(struct crypto_engine *engine, struct ablkcipher_request *req, int err); void crypto_finalize_hash_request(struct crypto_engine *engine, struct ahash_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 */