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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Asynchronous Compression operations
*
* Copyright (c) 2016, Intel Corporation
* Authors: Weigang Li <weigang.li@intel.com>
* Giovanni Cabiddu <giovanni.cabiddu@intel.com>
*/
#ifndef _CRYPTO_ACOMP_INT_H
#define _CRYPTO_ACOMP_INT_H
#include <crypto/acompress.h>
#include <crypto/algapi.h>
/**
* struct acomp_alg - asynchronous compression algorithm
*
* @compress: Function performs a compress operation
* @decompress: Function performs a de-compress operation
* @dst_free: Frees destination buffer if allocated inside the algorithm
* @init: Initialize the cryptographic transformation object.
* This function is used to initialize the cryptographic
* transformation object. This function is called only once at
* the instantiation time, right after the transformation context
* was allocated. In case the cryptographic hardware has some
* special requirements which need to be handled by software, this
* function shall check for the precise requirement of the
* transformation and put any software fallbacks in place.
* @exit: Deinitialize the cryptographic transformation object. This is a
* counterpart to @init, used to remove various changes set in
* @init.
*
* @reqsize: Context size for (de)compression requests
* @base: Common crypto API algorithm data structure
* @calg: Cmonn algorithm data structure shared with scomp
*/
struct acomp_alg {
int (*compress)(struct acomp_req *req);
int (*decompress)(struct acomp_req *req);
void (*dst_free)(struct scatterlist *dst);
int (*init)(struct crypto_acomp *tfm);
void (*exit)(struct crypto_acomp *tfm);
unsigned int reqsize;
union {
struct COMP_ALG_COMMON;
struct comp_alg_common calg;
};
};
/*
* Transform internal helpers.
*/
static inline void *acomp_request_ctx(struct acomp_req *req)
{
return req->__ctx;
}
static inline void *acomp_tfm_ctx(struct crypto_acomp *tfm)
{
return tfm->base.__crt_ctx;
}
static inline void acomp_request_complete(struct acomp_req *req,
int err)
{
crypto_request_complete(&req->base, err);
}
static inline struct acomp_req *__acomp_request_alloc_noprof(struct crypto_acomp *tfm)
{
struct acomp_req *req;
req = kzalloc_noprof(sizeof(*req) + crypto_acomp_reqsize(tfm), GFP_KERNEL);
if (likely(req))
acomp_request_set_tfm(req, tfm);
return req;
}
#define __acomp_request_alloc(...) alloc_hooks(__acomp_request_alloc_noprof(__VA_ARGS__))
static inline void __acomp_request_free(struct acomp_req *req)
{
kfree_sensitive(req);
}
/**
* crypto_register_acomp() -- Register asynchronous compression algorithm
*
* Function registers an implementation of an asynchronous
* compression algorithm
*
* @alg: algorithm definition
*
* Return: zero on success; error code in case of error
*/
int crypto_register_acomp(struct acomp_alg *alg);
/**
* crypto_unregister_acomp() -- Unregister asynchronous compression algorithm
*
* Function unregisters an implementation of an asynchronous
* compression algorithm
*
* @alg: algorithm definition
*/
void crypto_unregister_acomp(struct acomp_alg *alg);
int crypto_register_acomps(struct acomp_alg *algs, int count);
void crypto_unregister_acomps(struct acomp_alg *algs, int count);
#endif
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