mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 17:26:40 +07:00
6a8de3aefb
Add scomp backend for 842 compression algorithm. Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
161 lines
4.2 KiB
C
161 lines
4.2 KiB
C
/*
|
|
* Cryptographic API for the 842 software compression algorithm.
|
|
*
|
|
* 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.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* Copyright (C) IBM Corporation, 2011-2015
|
|
*
|
|
* Original Authors: Robert Jennings <rcj@linux.vnet.ibm.com>
|
|
* Seth Jennings <sjenning@linux.vnet.ibm.com>
|
|
*
|
|
* Rewrite: Dan Streetman <ddstreet@ieee.org>
|
|
*
|
|
* This is the software implementation of compression and decompression using
|
|
* the 842 format. This uses the software 842 library at lib/842/ which is
|
|
* only a reference implementation, and is very, very slow as compared to other
|
|
* software compressors. You probably do not want to use this software
|
|
* compression. If you have access to the PowerPC 842 compression hardware, you
|
|
* want to use the 842 hardware compression interface, which is at:
|
|
* drivers/crypto/nx/nx-842-crypto.c
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/sw842.h>
|
|
#include <crypto/internal/scompress.h>
|
|
|
|
struct crypto842_ctx {
|
|
void *wmem; /* working memory for compress */
|
|
};
|
|
|
|
static void *crypto842_alloc_ctx(struct crypto_scomp *tfm)
|
|
{
|
|
void *ctx;
|
|
|
|
ctx = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL);
|
|
if (!ctx)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
return ctx;
|
|
}
|
|
|
|
static int crypto842_init(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
ctx->wmem = crypto842_alloc_ctx(NULL);
|
|
if (IS_ERR(ctx->wmem))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void crypto842_free_ctx(struct crypto_scomp *tfm, void *ctx)
|
|
{
|
|
kfree(ctx);
|
|
}
|
|
|
|
static void crypto842_exit(struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
crypto842_free_ctx(NULL, ctx->wmem);
|
|
}
|
|
|
|
static int crypto842_compress(struct crypto_tfm *tfm,
|
|
const u8 *src, unsigned int slen,
|
|
u8 *dst, unsigned int *dlen)
|
|
{
|
|
struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
return sw842_compress(src, slen, dst, dlen, ctx->wmem);
|
|
}
|
|
|
|
static int crypto842_scompress(struct crypto_scomp *tfm,
|
|
const u8 *src, unsigned int slen,
|
|
u8 *dst, unsigned int *dlen, void *ctx)
|
|
{
|
|
return sw842_compress(src, slen, dst, dlen, ctx);
|
|
}
|
|
|
|
static int crypto842_decompress(struct crypto_tfm *tfm,
|
|
const u8 *src, unsigned int slen,
|
|
u8 *dst, unsigned int *dlen)
|
|
{
|
|
return sw842_decompress(src, slen, dst, dlen);
|
|
}
|
|
|
|
static int crypto842_sdecompress(struct crypto_scomp *tfm,
|
|
const u8 *src, unsigned int slen,
|
|
u8 *dst, unsigned int *dlen, void *ctx)
|
|
{
|
|
return sw842_decompress(src, slen, dst, dlen);
|
|
}
|
|
|
|
static struct crypto_alg alg = {
|
|
.cra_name = "842",
|
|
.cra_driver_name = "842-generic",
|
|
.cra_priority = 100,
|
|
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
|
|
.cra_ctxsize = sizeof(struct crypto842_ctx),
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = crypto842_init,
|
|
.cra_exit = crypto842_exit,
|
|
.cra_u = { .compress = {
|
|
.coa_compress = crypto842_compress,
|
|
.coa_decompress = crypto842_decompress } }
|
|
};
|
|
|
|
static struct scomp_alg scomp = {
|
|
.alloc_ctx = crypto842_alloc_ctx,
|
|
.free_ctx = crypto842_free_ctx,
|
|
.compress = crypto842_scompress,
|
|
.decompress = crypto842_sdecompress,
|
|
.base = {
|
|
.cra_name = "842",
|
|
.cra_driver_name = "842-scomp",
|
|
.cra_priority = 100,
|
|
.cra_module = THIS_MODULE,
|
|
}
|
|
};
|
|
|
|
static int __init crypto842_mod_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = crypto_register_alg(&alg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = crypto_register_scomp(&scomp);
|
|
if (ret) {
|
|
crypto_unregister_alg(&alg);
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
module_init(crypto842_mod_init);
|
|
|
|
static void __exit crypto842_mod_exit(void)
|
|
{
|
|
crypto_unregister_alg(&alg);
|
|
crypto_unregister_scomp(&scomp);
|
|
}
|
|
module_exit(crypto842_mod_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("842 Software Compression Algorithm");
|
|
MODULE_ALIAS_CRYPTO("842");
|
|
MODULE_ALIAS_CRYPTO("842-generic");
|
|
MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
|