172 lines
3.8 KiB
Ucode
172 lines
3.8 KiB
Ucode
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* raid6_vx$#.c
|
|
*
|
|
* $#-way unrolled RAID6 gen/xor functions for s390
|
|
* based on the vector facility
|
|
*
|
|
* Copyright IBM Corp. 2016
|
|
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
|
|
*
|
|
* This file is postprocessed using unroll.awk.
|
|
*/
|
|
|
|
#include <linux/raid/pq.h>
|
|
#include <asm/fpu/api.h>
|
|
|
|
asm(".include \"asm/vx-insn.h\"\n");
|
|
|
|
#define NSIZE 16
|
|
|
|
static inline void LOAD_CONST(void)
|
|
{
|
|
asm volatile("VREPIB %v24,7");
|
|
asm volatile("VREPIB %v25,0x1d");
|
|
}
|
|
|
|
/*
|
|
* The SHLBYTE() operation shifts each of the 16 bytes in
|
|
* vector register y left by 1 bit and stores the result in
|
|
* vector register x.
|
|
*/
|
|
static inline void SHLBYTE(int x, int y)
|
|
{
|
|
asm volatile ("VAB %0,%1,%1" : : "i" (x), "i" (y));
|
|
}
|
|
|
|
/*
|
|
* For each of the 16 bytes in the vector register y the MASK()
|
|
* operation returns 0xFF if the high bit of the byte is 1,
|
|
* or 0x00 if the high bit is 0. The result is stored in vector
|
|
* register x.
|
|
*/
|
|
static inline void MASK(int x, int y)
|
|
{
|
|
asm volatile ("VESRAVB %0,%1,24" : : "i" (x), "i" (y));
|
|
}
|
|
|
|
static inline void AND(int x, int y, int z)
|
|
{
|
|
asm volatile ("VN %0,%1,%2" : : "i" (x), "i" (y), "i" (z));
|
|
}
|
|
|
|
static inline void XOR(int x, int y, int z)
|
|
{
|
|
asm volatile ("VX %0,%1,%2" : : "i" (x), "i" (y), "i" (z));
|
|
}
|
|
|
|
static inline void LOAD_DATA(int x, u8 *ptr)
|
|
{
|
|
typedef struct { u8 _[16 * $#]; } addrtype;
|
|
register addrtype *__ptr asm("1") = (addrtype *) ptr;
|
|
|
|
asm volatile ("VLM %2,%3,0,%r1"
|
|
: : "m" (*__ptr), "a" (__ptr), "i" (x),
|
|
"i" (x + $# - 1));
|
|
}
|
|
|
|
static inline void STORE_DATA(int x, u8 *ptr)
|
|
{
|
|
typedef struct { u8 _[16 * $#]; } addrtype;
|
|
register addrtype *__ptr asm("1") = (addrtype *) ptr;
|
|
|
|
asm volatile ("VSTM %2,%3,0,1"
|
|
: "=m" (*__ptr) : "a" (__ptr), "i" (x),
|
|
"i" (x + $# - 1));
|
|
}
|
|
|
|
static inline void COPY_VEC(int x, int y)
|
|
{
|
|
asm volatile ("VLR %0,%1" : : "i" (x), "i" (y));
|
|
}
|
|
|
|
static void raid6_s390vx$#_gen_syndrome(int disks, size_t bytes, void **ptrs)
|
|
{
|
|
struct kernel_fpu vxstate;
|
|
u8 **dptr, *p, *q;
|
|
int d, z, z0;
|
|
|
|
kernel_fpu_begin(&vxstate, KERNEL_VXR);
|
|
LOAD_CONST();
|
|
|
|
dptr = (u8 **) ptrs;
|
|
z0 = disks - 3; /* Highest data disk */
|
|
p = dptr[z0 + 1]; /* XOR parity */
|
|
q = dptr[z0 + 2]; /* RS syndrome */
|
|
|
|
for (d = 0; d < bytes; d += $#*NSIZE) {
|
|
LOAD_DATA(0,&dptr[z0][d]);
|
|
COPY_VEC(8+$$,0+$$);
|
|
for (z = z0 - 1; z >= 0; z--) {
|
|
MASK(16+$$,8+$$);
|
|
AND(16+$$,16+$$,25);
|
|
SHLBYTE(8+$$,8+$$);
|
|
XOR(8+$$,8+$$,16+$$);
|
|
LOAD_DATA(16,&dptr[z][d]);
|
|
XOR(0+$$,0+$$,16+$$);
|
|
XOR(8+$$,8+$$,16+$$);
|
|
}
|
|
STORE_DATA(0,&p[d]);
|
|
STORE_DATA(8,&q[d]);
|
|
}
|
|
kernel_fpu_end(&vxstate, KERNEL_VXR);
|
|
}
|
|
|
|
static void raid6_s390vx$#_xor_syndrome(int disks, int start, int stop,
|
|
size_t bytes, void **ptrs)
|
|
{
|
|
struct kernel_fpu vxstate;
|
|
u8 **dptr, *p, *q;
|
|
int d, z, z0;
|
|
|
|
dptr = (u8 **) ptrs;
|
|
z0 = stop; /* P/Q right side optimization */
|
|
p = dptr[disks - 2]; /* XOR parity */
|
|
q = dptr[disks - 1]; /* RS syndrome */
|
|
|
|
kernel_fpu_begin(&vxstate, KERNEL_VXR);
|
|
LOAD_CONST();
|
|
|
|
for (d = 0; d < bytes; d += $#*NSIZE) {
|
|
/* P/Q data pages */
|
|
LOAD_DATA(0,&dptr[z0][d]);
|
|
COPY_VEC(8+$$,0+$$);
|
|
for (z = z0 - 1; z >= start; z--) {
|
|
MASK(16+$$,8+$$);
|
|
AND(16+$$,16+$$,25);
|
|
SHLBYTE(8+$$,8+$$);
|
|
XOR(8+$$,8+$$,16+$$);
|
|
LOAD_DATA(16,&dptr[z][d]);
|
|
XOR(0+$$,0+$$,16+$$);
|
|
XOR(8+$$,8+$$,16+$$);
|
|
}
|
|
/* P/Q left side optimization */
|
|
for (z = start - 1; z >= 0; z--) {
|
|
MASK(16+$$,8+$$);
|
|
AND(16+$$,16+$$,25);
|
|
SHLBYTE(8+$$,8+$$);
|
|
XOR(8+$$,8+$$,16+$$);
|
|
}
|
|
LOAD_DATA(16,&p[d]);
|
|
XOR(16+$$,16+$$,0+$$);
|
|
STORE_DATA(16,&p[d]);
|
|
LOAD_DATA(16,&q[d]);
|
|
XOR(16+$$,16+$$,8+$$);
|
|
STORE_DATA(16,&q[d]);
|
|
}
|
|
kernel_fpu_end(&vxstate, KERNEL_VXR);
|
|
}
|
|
|
|
static int raid6_s390vx$#_valid(void)
|
|
{
|
|
return MACHINE_HAS_VX;
|
|
}
|
|
|
|
const struct raid6_calls raid6_s390vx$# = {
|
|
raid6_s390vx$#_gen_syndrome,
|
|
raid6_s390vx$#_xor_syndrome,
|
|
raid6_s390vx$#_valid,
|
|
"vx128x$#",
|
|
1
|
|
};
|