135 lines
2.8 KiB
C
135 lines
2.8 KiB
C
|
/*
|
||
|
|
* Optimized xor_block operation for RAID4/5
|
||
|
|
*
|
||
|
|
* Copyright IBM Corp. 2016
|
||
|
|
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/raid/xor.h>
|
||
|
|
|
||
|
|
static void xor_xc_2(unsigned long bytes, unsigned long *p1, unsigned long *p2)
|
||
|
|
{
|
||
|
|
asm volatile(
|
||
|
|
" larl 1,2f\n"
|
||
|
|
" 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: ex %0,0(1)\n"
|
||
|
|
" j 3f\n"
|
||
|
|
"2: xc 0(1,%1),0(%2)\n"
|
||
|
|
"3:\n"
|
||
|
|
: : "d" (bytes), "a" (p1), "a" (p2)
|
||
|
|
: "0", "1", "cc", "memory");
|
||
|
|
}
|
||
|
|
|
||
|
|
static void xor_xc_3(unsigned long bytes, unsigned long *p1, unsigned long *p2,
|
||
|
|
unsigned long *p3)
|
||
|
|
{
|
||
|
|
asm volatile(
|
||
|
|
" larl 1,2f\n"
|
||
|
|
" 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"
|
||
|
|
" 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: ex %0,0(1)\n"
|
||
|
|
" ex %0,6(1)\n"
|
||
|
|
" j 3f\n"
|
||
|
|
"2: xc 0(1,%1),0(%2)\n"
|
||
|
|
" xc 0(1,%1),0(%3)\n"
|
||
|
|
"3:\n"
|
||
|
|
: "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3)
|
||
|
|
: : "0", "1", "cc", "memory");
|
||
|
|
}
|
||
|
|
|
||
|
|
static void xor_xc_4(unsigned long bytes, unsigned long *p1, unsigned long *p2,
|
||
|
|
unsigned long *p3, unsigned long *p4)
|
||
|
|
{
|
||
|
|
asm volatile(
|
||
|
|
" larl 1,2f\n"
|
||
|
|
" 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"
|
||
|
|
" 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: ex %0,0(1)\n"
|
||
|
|
" ex %0,6(1)\n"
|
||
|
|
" ex %0,12(1)\n"
|
||
|
|
" j 3f\n"
|
||
|
|
"2: xc 0(1,%1),0(%2)\n"
|
||
|
|
" xc 0(1,%1),0(%3)\n"
|
||
|
|
" xc 0(1,%1),0(%4)\n"
|
||
|
|
"3:\n"
|
||
|
|
: "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4)
|
||
|
|
: : "0", "1", "cc", "memory");
|
||
|
|
}
|
||
|
|
|
||
|
|
static void xor_xc_5(unsigned long bytes, unsigned long *p1, unsigned long *p2,
|
||
|
|
unsigned long *p3, unsigned long *p4, unsigned long *p5)
|
||
|
|
{
|
||
|
|
/* Get around a gcc oddity */
|
||
|
|
register unsigned long *reg7 asm ("7") = p5;
|
||
|
|
|
||
|
|
asm volatile(
|
||
|
|
" larl 1,2f\n"
|
||
|
|
" 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"
|
||
|
|
" 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: ex %0,0(1)\n"
|
||
|
|
" ex %0,6(1)\n"
|
||
|
|
" ex %0,12(1)\n"
|
||
|
|
" ex %0,18(1)\n"
|
||
|
|
" j 3f\n"
|
||
|
|
"2: xc 0(1,%1),0(%2)\n"
|
||
|
|
" xc 0(1,%1),0(%3)\n"
|
||
|
|
" xc 0(1,%1),0(%4)\n"
|
||
|
|
" xc 0(1,%1),0(%5)\n"
|
||
|
|
"3:\n"
|
||
|
|
: "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4),
|
||
|
|
"+a" (reg7)
|
||
|
|
: : "0", "1", "cc", "memory");
|
||
|
|
}
|
||
|
|
|
||
|
|
struct xor_block_template xor_block_xc = {
|
||
|
|
.name = "xc",
|
||
|
|
.do_2 = xor_xc_2,
|
||
|
|
.do_3 = xor_xc_3,
|
||
|
|
.do_4 = xor_xc_4,
|
||
|
|
.do_5 = xor_xc_5,
|
||
|
|
};
|
||
|
|
EXPORT_SYMBOL(xor_block_xc);
|