mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 17:57:23 +07:00
3dd8cc00c3
scatterwalk_samebuf() is never used. Remove it. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
/*
|
|
* Cryptographic scatter and gather helpers.
|
|
*
|
|
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
|
|
* Copyright (c) 2002 Adam J. Richter <adam@yggdrasil.com>
|
|
* Copyright (c) 2004 Jean-Luc Cooke <jlcooke@certainkey.com>
|
|
* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#ifndef _CRYPTO_SCATTERWALK_H
|
|
#define _CRYPTO_SCATTERWALK_H
|
|
|
|
#include <crypto/algapi.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/scatterlist.h>
|
|
|
|
static inline void scatterwalk_crypto_chain(struct scatterlist *head,
|
|
struct scatterlist *sg, int num)
|
|
{
|
|
if (sg)
|
|
sg_chain(head, num, sg);
|
|
else
|
|
sg_mark_end(head);
|
|
}
|
|
|
|
static inline unsigned int scatterwalk_pagelen(struct scatter_walk *walk)
|
|
{
|
|
unsigned int len = walk->sg->offset + walk->sg->length - walk->offset;
|
|
unsigned int len_this_page = offset_in_page(~walk->offset) + 1;
|
|
return len_this_page > len ? len : len_this_page;
|
|
}
|
|
|
|
static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk,
|
|
unsigned int nbytes)
|
|
{
|
|
unsigned int len_this_page = scatterwalk_pagelen(walk);
|
|
return nbytes > len_this_page ? len_this_page : nbytes;
|
|
}
|
|
|
|
static inline void scatterwalk_advance(struct scatter_walk *walk,
|
|
unsigned int nbytes)
|
|
{
|
|
walk->offset += nbytes;
|
|
}
|
|
|
|
static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk,
|
|
unsigned int alignmask)
|
|
{
|
|
return !(walk->offset & alignmask);
|
|
}
|
|
|
|
static inline struct page *scatterwalk_page(struct scatter_walk *walk)
|
|
{
|
|
return sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
|
|
}
|
|
|
|
static inline void scatterwalk_unmap(void *vaddr)
|
|
{
|
|
kunmap_atomic(vaddr);
|
|
}
|
|
|
|
static inline void scatterwalk_start(struct scatter_walk *walk,
|
|
struct scatterlist *sg)
|
|
{
|
|
walk->sg = sg;
|
|
walk->offset = sg->offset;
|
|
}
|
|
|
|
static inline void *scatterwalk_map(struct scatter_walk *walk)
|
|
{
|
|
return kmap_atomic(scatterwalk_page(walk)) +
|
|
offset_in_page(walk->offset);
|
|
}
|
|
|
|
static inline void scatterwalk_pagedone(struct scatter_walk *walk, int out,
|
|
unsigned int more)
|
|
{
|
|
if (out) {
|
|
struct page *page;
|
|
|
|
page = sg_page(walk->sg) + ((walk->offset - 1) >> PAGE_SHIFT);
|
|
/* Test ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE first as
|
|
* PageSlab cannot be optimised away per se due to
|
|
* use of volatile pointer.
|
|
*/
|
|
if (ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE && !PageSlab(page))
|
|
flush_dcache_page(page);
|
|
}
|
|
|
|
if (more && walk->offset >= walk->sg->offset + walk->sg->length)
|
|
scatterwalk_start(walk, sg_next(walk->sg));
|
|
}
|
|
|
|
static inline void scatterwalk_done(struct scatter_walk *walk, int out,
|
|
int more)
|
|
{
|
|
if (!more || walk->offset >= walk->sg->offset + walk->sg->length ||
|
|
!(walk->offset & (PAGE_SIZE - 1)))
|
|
scatterwalk_pagedone(walk, out, more);
|
|
}
|
|
|
|
void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
|
|
size_t nbytes, int out);
|
|
void *scatterwalk_map(struct scatter_walk *walk);
|
|
|
|
void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
|
|
unsigned int start, unsigned int nbytes, int out);
|
|
|
|
struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2],
|
|
struct scatterlist *src,
|
|
unsigned int len);
|
|
|
|
#endif /* _CRYPTO_SCATTERWALK_H */
|