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s390/xor: optimized xor routing using the XC instruction 

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2016-02-02 14:40:40 +01:00
parent 9a99649f2a
commit 2cfc5f9ce7
3 changed files with 155 additions and 2 deletions
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21
arch/s390/include/asm/xor.h
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@ -1 +1,20 @@
#include <asm-generic/xor.h>
/*
* Optimited xor routines
*
* Copyright IBM Corp. 2016
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#ifndef _ASM_S390_XOR_H
#define _ASM_S390_XOR_H
extern struct xor_block_template xor_block_xc;
#undef XOR_TRY_TEMPLATES
#define XOR_TRY_TEMPLATES \
do { \
xor_speed(&xor_block_xc); \
} while (0)
#define XOR_SELECT_TEMPLATE(FASTEST) (&xor_block_xc)
#endif /* _ASM_S390_XOR_H */

2
arch/s390/lib/Makefile
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@ -3,7 +3,7 @@
#
lib-y += delay.o string.o uaccess.o find.o
obj-y += mem.o
obj-y += mem.o xor.o
lib-$(CONFIG_SMP) += spinlock.o
lib-$(CONFIG_KPROBES) += probes.o
lib-$(CONFIG_UPROBES) += probes.o

134
arch/s390/lib/xor.c Normal file
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@ -0,0 +1,134 @@
/*
* 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);