| 1 | |
| 2 | * Crypto engine API
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| 3 | *
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| 4 | * Copyright (c) 2016 Baolin Wang <[email protected]>
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| 5 | *
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| 6 | * This program is free software; you can redistribute it and/or modify it
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| 7 | * under the terms of the GNU General Public License as published by the Free
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| 8 | * Software Foundation; either version 2 of the License, or (at your option)
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| 9 | * any later version.
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| 10 | *
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| 11 |
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| 12 | #ifndef _CRYPTO_ENGINE_H
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| 13 | #define _CRYPTO_ENGINE_H
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| 14 |
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| 15 | #include <linux/crypto.h>
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| 16 | #include <linux/list.h>
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| 17 | #include <linux/kernel.h>
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| 18 | #include <linux/kthread.h>
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| 19 | #include <crypto/algapi.h>
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| 20 | #include <crypto/hash.h>
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| 21 |
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| 22 | #define ENGINE_NAME_LEN 30
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| 23 | |
| 24 | * struct crypto_engine - crypto hardware engine
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| 25 | * @name: the engine name
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| 26 | * @idling: the engine is entering idle state
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| 27 | * @busy: request pump is busy
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| 28 | * @running: the engine is on working
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| 29 | * @cur_req_prepared: current request is prepared
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| 30 | * @list: link with the global crypto engine list
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| 31 | * @queue_lock: spinlock to syncronise access to request queue
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| 32 | * @queue: the crypto queue of the engine
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| 33 | * @rt: whether this queue is set to run as a realtime task
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| 34 | * @prepare_crypt_hardware: a request will soon arrive from the queue
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| 35 | * so the subsystem requests the driver to prepare the hardware
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| 36 | * by issuing this call
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| 37 | * @unprepare_crypt_hardware: there are currently no more requests on the
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| 38 | * queue so the subsystem notifies the driver that it may relax the
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| 39 | * hardware by issuing this call
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| 40 | * @prepare_cipher_request: do some prepare if need before handle the current request
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| 41 | * @unprepare_cipher_request: undo any work done by prepare_cipher_request()
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| 42 | * @cipher_one_request: do encryption for current request
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| 43 | * @prepare_hash_request: do some prepare if need before handle the current request
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| 44 | * @unprepare_hash_request: undo any work done by prepare_hash_request()
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| 45 | * @hash_one_request: do hash for current request
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| 46 | * @kworker: kthread worker struct for request pump
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| 47 | * @pump_requests: work struct for scheduling work to the request pump
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| 48 | * @priv_data: the engine private data
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| 49 | * @cur_req: the current request which is on processing
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| 50 |
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| 51 | struct crypto_engine {
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| 52 | char name[ENGINE_NAME_LEN];
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| 53 | bool idling;
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| 54 | bool busy;
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| 55 | bool running;
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| 56 | bool cur_req_prepared;
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| 57 |
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| 58 | struct list_head list;
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| 59 | spinlock_t queue_lock;
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| 60 | struct crypto_queue queue;
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| 61 | struct device *dev;
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| 62 |
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| 63 | bool rt;
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| 64 |
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| 65 | int (*prepare_crypt_hardware)(struct crypto_engine *engine);
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| 66 | int (*unprepare_crypt_hardware)(struct crypto_engine *engine);
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| 67 |
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| 68 | int (*prepare_cipher_request)(struct crypto_engine *engine,
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| 69 | struct ablkcipher_request *req);
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| 70 | int (*unprepare_cipher_request)(struct crypto_engine *engine,
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| 71 | struct ablkcipher_request *req);
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| 72 | int (*prepare_hash_request)(struct crypto_engine *engine,
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| 73 | struct ahash_request *req);
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| 74 | int (*unprepare_hash_request)(struct crypto_engine *engine,
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| 75 | struct ahash_request *req);
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| 76 | int (*cipher_one_request)(struct crypto_engine *engine,
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| 77 | struct ablkcipher_request *req);
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| 78 | int (*hash_one_request)(struct crypto_engine *engine,
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| 79 | struct ahash_request *req);
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| 80 |
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| 81 | struct kthread_worker *kworker;
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| 82 | struct kthread_work pump_requests;
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| 83 |
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| 84 | void *priv_data;
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| 85 | struct crypto_async_request *cur_req;
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| 86 | };
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| 87 |
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| 88 | int crypto_transfer_cipher_request(struct crypto_engine *engine,
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| 89 | struct ablkcipher_request *req,
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| 90 | bool need_pump);
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| 91 | int crypto_transfer_cipher_request_to_engine(struct crypto_engine *engine,
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| 92 | struct ablkcipher_request *req);
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| 93 | int crypto_transfer_hash_request(struct crypto_engine *engine,
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| 94 | struct ahash_request *req, bool need_pump);
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| 95 | int crypto_transfer_hash_request_to_engine(struct crypto_engine *engine,
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| 96 | struct ahash_request *req);
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| 97 | void crypto_finalize_cipher_request(struct crypto_engine *engine,
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| 98 | struct ablkcipher_request *req, int err);
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| 99 | void crypto_finalize_hash_request(struct crypto_engine *engine,
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| 100 | struct ahash_request *req, int err);
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| 101 | int crypto_engine_start(struct crypto_engine *engine);
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| 102 | int crypto_engine_stop(struct crypto_engine *engine);
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| 103 | struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt);
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| 104 | int crypto_engine_exit(struct crypto_engine *engine);
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| 105 |
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| 106 | #endif
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