Contributors: 6
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Martin Schwidefsky |
138 |
74.19% |
1 |
14.29% |
| Ard Biesheuvel |
24 |
12.90% |
1 |
14.29% |
| Christoph Hellwig |
17 |
9.14% |
2 |
28.57% |
| Heiko Carstens |
4 |
2.15% |
1 |
14.29% |
| Vasily Gorbik |
2 |
1.08% |
1 |
14.29% |
| Greg Kroah-Hartman |
1 |
0.54% |
1 |
14.29% |
| Total |
186 |
|
7 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* Optimized xor_block operation for RAID4/5
*
* Copyright IBM Corp. 2016
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#include <linux/types.h>
#include "xor_impl.h"
#include "xor_arch.h"
static void xor_xc_2(unsigned long bytes, unsigned long * __restrict p1,
const unsigned long * __restrict p2)
{
asm volatile(
" aghi %0,-1\n"
" jm 3f\n"
" srlg 0,%0,8\n"
" ltgr 0,0\n"
" jz 1f\n"
"0: xc 0(256,%1),0(%2)\n"
" la %1,256(%1)\n"
" la %2,256(%2)\n"
" brctg 0,0b\n"
"1: exrl %0,2f\n"
" j 3f\n"
"2: xc 0(1,%1),0(%2)\n"
"3:"
: "+a" (bytes), "+a" (p1), "+a" (p2)
: : "0", "cc", "memory");
}
static void xor_xc_3(unsigned long bytes, unsigned long * __restrict p1,
const unsigned long * __restrict p2,
const unsigned long * __restrict p3)
{
asm volatile(
" aghi %0,-1\n"
" jm 4f\n"
" srlg 0,%0,8\n"
" ltgr 0,0\n"
" jz 1f\n"
"0: xc 0(256,%1),0(%2)\n"
" xc 0(256,%1),0(%3)\n"
" la %1,256(%1)\n"
" la %2,256(%2)\n"
" la %3,256(%3)\n"
" brctg 0,0b\n"
"1: exrl %0,2f\n"
" exrl %0,3f\n"
" j 4f\n"
"2: xc 0(1,%1),0(%2)\n"
"3: xc 0(1,%1),0(%3)\n"
"4:"
: "+a" (bytes), "+a" (p1), "+a" (p2), "+a" (p3)
: : "0", "cc", "memory");
}
static void xor_xc_4(unsigned long bytes, unsigned long * __restrict p1,
const unsigned long * __restrict p2,
const unsigned long * __restrict p3,
const unsigned long * __restrict p4)
{
asm volatile(
" aghi %0,-1\n"
" jm 5f\n"
" srlg 0,%0,8\n"
" ltgr 0,0\n"
" jz 1f\n"
"0: xc 0(256,%1),0(%2)\n"
" xc 0(256,%1),0(%3)\n"
" xc 0(256,%1),0(%4)\n"
" la %1,256(%1)\n"
" la %2,256(%2)\n"
" la %3,256(%3)\n"
" la %4,256(%4)\n"
" brctg 0,0b\n"
"1: exrl %0,2f\n"
" exrl %0,3f\n"
" exrl %0,4f\n"
" j 5f\n"
"2: xc 0(1,%1),0(%2)\n"
"3: xc 0(1,%1),0(%3)\n"
"4: xc 0(1,%1),0(%4)\n"
"5:"
: "+a" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4)
: : "0", "cc", "memory");
}
static void xor_xc_5(unsigned long bytes, unsigned long * __restrict p1,
const unsigned long * __restrict p2,
const unsigned long * __restrict p3,
const unsigned long * __restrict p4,
const unsigned long * __restrict p5)
{
asm volatile(
" aghi %0,-1\n"
" jm 6f\n"
" srlg 0,%0,8\n"
" ltgr 0,0\n"
" jz 1f\n"
"0: xc 0(256,%1),0(%2)\n"
" xc 0(256,%1),0(%3)\n"
" xc 0(256,%1),0(%4)\n"
" xc 0(256,%1),0(%5)\n"
" la %1,256(%1)\n"
" la %2,256(%2)\n"
" la %3,256(%3)\n"
" la %4,256(%4)\n"
" la %5,256(%5)\n"
" brctg 0,0b\n"
"1: exrl %0,2f\n"
" exrl %0,3f\n"
" exrl %0,4f\n"
" exrl %0,5f\n"
" j 6f\n"
"2: xc 0(1,%1),0(%2)\n"
"3: xc 0(1,%1),0(%3)\n"
"4: xc 0(1,%1),0(%4)\n"
"5: xc 0(1,%1),0(%5)\n"
"6:"
: "+a" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4),
"+a" (p5)
: : "0", "cc", "memory");
}
DO_XOR_BLOCKS(xc, xor_xc_2, xor_xc_3, xor_xc_4, xor_xc_5);
struct xor_block_template xor_block_xc = {
.name = "xc",
.xor_gen = xor_gen_xc,
};