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  	   ˆÀÂ0ÅÄ     ˆÀÂƒ|!¿ÅÄ #–    /* 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_H
#define _CRYPTO_ACOMP_H
#include <linux/crypto.h>

#define CRYPTO_ACOMP_ALLOC_OUTPUT	0x00000001
#define CRYPTO_ACOMP_DST_MAX		131072

/**
 * struct acomp_req - asynchronous (de)compression request
 *
 * @base:	Common attributes for asynchronous crypto requests
 * @src:	Source Data
 * @dst:	Destination data
 * @slen:	Size of the input buffer
 * @dlen:	Size of the output buffer and number of bytes produced
 * @flags:	Internal flags
 * @__ctx:	Start of private context data
 */
struct acomp_req {
	struct crypto_async_request base;
	struct scatterlist *src;
	struct scatterlist *dst;
	unsigned int slen;
	unsigned int dlen;
	u32 flags;
	void *__ctx[] CRYPTO_MINALIGN_ATTR;
};

/**
 * struct crypto_acomp - user-instantiated objects which encapsulate
 * algorithms and core processing logic
 *
 * @compress:		Function performs a compress operation
 * @decompress:		Function performs a de-compress operation
 * @dst_free:		Frees destination buffer if allocated inside the
 *			algorithm
 * @reqsize:		Context size for (de)compression requests
 * @base:		Common crypto API algorithm data structure
 */
struct crypto_acomp {
	int (*compress)(struct acomp_req *req);
	int (*decompress)(struct acomp_req *req);
	void (*dst_free)(struct scatterlist *dst);
	unsigned int reqsize;
	struct crypto_tfm base;
};

/**
 * 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
 */
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;
	struct crypto_alg base;
};

/**
 * DOC: Asynchronous Compression API
 *
 * The Asynchronous Compression API is used with the algorithms of type
 * CRYPTO_ALG_TYPE_ACOMPRESS (listed as type "acomp" in /proc/crypto)
 */

/**
 * crypto_alloc_acomp() -- allocate ACOMPRESS tfm handle
 * @alg_name:	is the cra_name / name or cra_driver_name / driver name of the
 *		compression algorithm e.g. "deflate"
 * @type:	specifies the type of the algorithm
 * @mask:	specifies the mask for the algorithm
 *
 * Allocate a handle for a compression algorithm. The returned struct
 * crypto_acomp is the handle that is required for any subsequent
 * API invocation for the compression operations.
 *
 * Return:	allocated handle in case of success; IS_ERR() is true in case
 *		of an error, PTR_ERR() returns the error code.
 */
struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
					u32 mask);
/**
 * crypto_alloc_acomp_node() -- allocate ACOMPRESS tfm handle with desired NUMA node
 * @alg_name:	is the cra_name / name or cra_driver_name / driver name of the
 *		compression algorithm e.g. "deflate"
 * @type:	specifies the type of the algorithm
 * @mask:	specifies the mask fo