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// SPDX-License-Identifier: GPL-2.0
/*
* linux/drivers/staging/erofs/unzip_vle_lz4.c
*
* Copyright (C) 2018 HUAWEI, Inc.
* http://www.huawei.com/
* Created by Gao Xiang <gaoxiang25@huawei.com>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of the Linux
* distribution for more details.
*/
#include "unzip_vle.h"
#include <linux/lz4.h>
static int z_erofs_unzip_lz4(void *in, void *out, size_t inlen, size_t outlen)
{
int ret = LZ4_decompress_safe_partial(in, out, inlen, outlen, outlen);
if (ret >= 0)
return ret;
/*
* LZ4_decompress_safe_partial will return an error code
* (< 0) if decompression failed
*/
errln("%s, failed to decompress, in[%p, %zu] outlen[%p, %zu]",
__func__, in, inlen, out, outlen);
WARN_ON(1);
print_hex_dump(KERN_DEBUG, "raw data [in]: ", DUMP_PREFIX_OFFSET,
16, 1, in, inlen, true);
print_hex_dump(KERN_DEBUG, "raw data [out]: ", DUMP_PREFIX_OFFSET,
16, 1, out, outlen, true);
return -EIO;
}
#if Z_EROFS_CLUSTER_MAX_PAGES > Z_EROFS_VLE_INLINE_PAGEVECS
#define EROFS_PERCPU_NR_PAGES Z_EROFS_CLUSTER_MAX_PAGES
#else
#define EROFS_PERCPU_NR_PAGES Z_EROFS_VLE_INLINE_PAGEVECS
#endif
static struct {
char data[PAGE_SIZE * EROFS_PERCPU_NR_PAGES];
} erofs_pcpubuf[NR_CPUS];
int z_erofs_vle_plain_copy(struct page **compressed_pages,
unsigned int clusterpages,
struct page **pages,
unsigned int nr_pages,
unsigned short pageofs)
{
unsigned int i, j;
void *src = NULL;
const unsigned int righthalf = PAGE_SIZE - pageofs;
char *percpu_data;
bool mirrored[Z_EROFS_CLUSTER_MAX_PAGES] = { 0 };
preempt_disable();
percpu_data = erofs_pcpubuf[smp_processor_id()].data;
j = 0;
for (i = 0; i < nr_pages; j = i++) {
struct page *page = pages[i];
void *dst;
if (!page) {
if (src) {
if (!mirrored[j])
kunmap_atomic(src);
src = NULL;
}
continue;
}
dst = kmap_atomic(page);
for (; j < clusterpages; ++j) {
if (compressed_pages[j] != page)
continue;
DBG_BUGON(mirrored[j]);
memcpy(percpu_data + j * PAGE_SIZE, dst, PAGE_SIZE);
mirrored[j] = true;
break;
}
if (i) {
if (!src)
src = mirrored[i - 1] ?
percpu_data + (i - 1) * PAGE_SIZE :
kmap_atomic(compressed_pages[i - 1]);
memcpy(dst, src + righthalf, pageofs);
if (!mirrored[i - 1])
kunmap_atomic(src);
if (unlikely(i >= clusterpages)) {
kunmap_atomic(dst);
break;
}
}
if (!righthalf) {
src = NULL;
} else {
src = mirrored[i] ? percpu_data + i * PAGE_SIZE :
kmap_atomic(compressed_pages[i]);
memcpy(dst + pageofs, src, righthalf);
}
kunmap_atomic(dst);
}
if (src && !mirrored[j])
kunmap_atomic(src);
preempt_enable();
return 0;
}
int z_erofs_vle_unzip_fast_percpu(struct page **compressed_pages,
unsigned int clusterpages,
struct page **pages,
unsigned int outlen,
unsigned short pageofs)
{
void *vin, *vout;
unsigned int nr_pages, i, j;
int ret;
if (outlen + pageofs > EROFS_PERCPU_NR_PAGES * PAGE_SIZE)
return -ENOTSUPP;
nr_pages = DIV_ROUND_UP(outlen + pageofs, PAGE_SIZE);
if (clusterpages == 1) {
vin = kmap_atomic(compressed_pages[0]);
} else {
vin = erofs_vmap(compressed_pages, clusterpages);
if (!vin)
return -ENOMEM;
}
preempt_disable();
vout = erofs_pcpubuf[smp_processor_id()].data;
ret = z_erofs_unzip_lz4(vin, vout + pageofs,
clusterpages * PAGE_SIZE, outlen);
if (ret < 0)
goto out;
ret = 0;
for (i = 0; i < nr_pages; ++i) {
j = min((unsigned int)PAGE_SIZE - pageofs, outlen);
if (pages[i]) {
if (clusterpages == 1 &&
pages[i] == compressed_pages[0]) {
memcpy(vin + pageofs, vout + pageofs, j);
} else {
void *dst = kmap_atomic(pages[i]);
memcpy(dst + pageofs, vout + pageofs, j);
kunmap_atomic(dst);
}
}
vout += PAGE_SIZE;
outlen -= j;
pageofs = 0;
}
out:
preempt_enable();
if (clusterpages == 1)
kunmap_atomic(vin);
else
erofs_vunmap(vin, clusterpages);
return ret;
}
int z_erofs_vle_unzip_vmap(struct page **compressed_pages,
unsigned int clusterpages,
void *vout,
unsigned int llen,
unsigned short pageofs,
bool overlapped)
{
void *vin;
unsigned int i;
int ret;
if (overlapped) {
preempt_disable();
vin = erofs_pcpubuf[smp_processor_id()].data;
for (i = 0; i < clusterpages; ++i) {
void *t = kmap_atomic(compressed_pages[i]);
memcpy(vin + PAGE_SIZE * i, t, PAGE_SIZE);
kunmap_atomic(t);
}
} else if (clusterpages == 1) {
vin = kmap_atomic(compressed_pages[0]);
} else {
vin = erofs_vmap(compressed_pages, clusterpages);
}
ret = z_erofs_unzip_lz4(vin, vout + pageofs,
clusterpages * PAGE_SIZE, llen);
if (ret > 0)
ret = 0;
if (!overlapped) {
if (clusterpages == 1)
kunmap_atomic(vin);
else
erofs_vunmap(vin, clusterpages);
} else {
preempt_enable();
}
return ret;
}
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