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https://github.com/tbsdtv/linux_media.git
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6a89f492f8
Added support for executing multiple requests, in parallel, for crypto engine based on a retry mechanism. If hardware was unable to execute a backlog request, enqueue it back in front of crypto-engine queue, to keep the order of requests. A new variable is added, retry_support (this is to keep the backward compatibility of crypto-engine) , which keeps track whether the hardware has support for retry mechanism and, also, if can run multiple requests. If do_one_request() returns: >= 0: hardware executed the request successfully; < 0: this is the old error path. If hardware has support for retry mechanism, the request is put back in front of crypto-engine queue. For backwards compatibility, if the retry support is not available, the crypto-engine will work as before. If hardware queue is full (-ENOSPC), requeue request regardless of MAY_BACKLOG flag. If hardware throws any other error code (like -EIO, -EINVAL, -ENOMEM, etc.) only MAY_BACKLOG requests are enqueued back into crypto-engine's queue, since the others can be dropped. The new crypto_engine_alloc_init_and_set function, initializes crypto-engine, sets the maximum size for crypto-engine software queue (not hardcoded anymore) and the retry_support variable is set, by default, to false. On crypto_pump_requests(), if do_one_request() returns >= 0, a new request is send to hardware, until there is no space in hardware and do_one_request() returns < 0. By default, retry_support is false and crypto-engine will work as before - will send requests to hardware, one-by-one, on crypto_pump_requests(), and complete it, on crypto_finalize_request(), and so on. To support multiple requests, in each driver, retry_support must be set on true, and if do_one_request() returns an error the request must not be freed, since it will be enqueued back into crypto-engine's queue. When all drivers, that use crypto-engine now, will be updated for retry mechanism, the retry_support variable can be removed. Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
114 lines
3.9 KiB
C
114 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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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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#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/aead.h>
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#include <crypto/akcipher.h>
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#include <crypto/hash.h>
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#include <crypto/skcipher.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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* @retry_support: indication that the hardware allows re-execution
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* of a failed backlog request
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* crypto-engine, in head position to keep order
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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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* @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 retry_support;
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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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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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/*
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* struct crypto_engine_op - crypto hardware engine operations
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* @prepare__request: do some prepare if need before handle the current request
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* @unprepare_request: undo any work done by prepare_request()
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* @do_one_request: do encryption for current request
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*/
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struct crypto_engine_op {
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int (*prepare_request)(struct crypto_engine *engine,
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void *areq);
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int (*unprepare_request)(struct crypto_engine *engine,
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void *areq);
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int (*do_one_request)(struct crypto_engine *engine,
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void *areq);
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};
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struct crypto_engine_ctx {
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struct crypto_engine_op op;
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};
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int crypto_transfer_aead_request_to_engine(struct crypto_engine *engine,
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struct aead_request *req);
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int crypto_transfer_akcipher_request_to_engine(struct crypto_engine *engine,
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struct akcipher_request *req);
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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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int crypto_transfer_skcipher_request_to_engine(struct crypto_engine *engine,
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struct skcipher_request *req);
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void crypto_finalize_aead_request(struct crypto_engine *engine,
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struct aead_request *req, int err);
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void crypto_finalize_akcipher_request(struct crypto_engine *engine,
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struct akcipher_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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void crypto_finalize_skcipher_request(struct crypto_engine *engine,
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struct skcipher_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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struct crypto_engine *crypto_engine_alloc_init_and_set(struct device *dev,
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bool retry_support,
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bool rt, int qlen);
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int crypto_engine_exit(struct crypto_engine *engine);
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#endif /* _CRYPTO_ENGINE_H */
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