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