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RAID/s390: add SIMD implementation for raid6 gen/xor
Using vector registers is slightly faster: raid6: vx128x8 gen() 19705 MB/s raid6: vx128x8 xor() 11886 MB/s raid6: using algorithm vx128x8 gen() 19705 MB/s raid6: .... xor() 11886 MB/s, rmw enabled vs the software algorithms: raid6: int64x1 gen() 3018 MB/s raid6: int64x1 xor() 1429 MB/s raid6: int64x2 gen() 4661 MB/s raid6: int64x2 xor() 3143 MB/s raid6: int64x4 gen() 5392 MB/s raid6: int64x4 xor() 3509 MB/s raid6: int64x8 gen() 4441 MB/s raid6: int64x8 xor() 3207 MB/s raid6: using algorithm int64x4 gen() 5392 MB/s raid6: .... xor() 3509 MB/s, rmw enabled Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
parent
8f149ea6e9
commit
474fd6e80f
@ -278,6 +278,15 @@
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VLVG \v, \gr, \index, 3
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.endm
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/* VECTOR LOAD REGISTER */
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.macro VLR v1, v2
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VX_NUM v1, \v1
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VX_NUM v2, \v2
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.word 0xE700 | ((v1&15) << 4) | (v2&15)
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.word 0
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MRXBOPC 0, 0x56, v1, v2
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.endm
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/* VECTOR LOAD */
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.macro VL v, disp, index="%r0", base
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VX_NUM v1, \v
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@ -404,6 +413,16 @@
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/* Vector integer instructions */
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/* VECTOR AND */
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.macro VN vr1, vr2, vr3
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VX_NUM v1, \vr1
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VX_NUM v2, \vr2
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VX_NUM v3, \vr3
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.word 0xE700 | ((v1&15) << 4) | (v2&15)
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.word ((v3&15) << 12)
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MRXBOPC 0, 0x68, v1, v2, v3
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.endm
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/* VECTOR EXCLUSIVE OR */
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.macro VX vr1, vr2, vr3
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VX_NUM v1, \vr1
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@ -469,6 +488,73 @@
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MRXBOPC 0, 0x7D, v1, v2, v3
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.endm
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/* VECTOR REPLICATE IMMEDIATE */
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.macro VREPI vr1, imm2, m3
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VX_NUM v1, \vr1
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.word 0xE700 | ((v1&15) << 4)
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.word \imm2
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MRXBOPC \m3, 0x45, v1
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.endm
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.macro VREPIB vr1, imm2
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VREPI \vr1, \imm2, 0
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.endm
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.macro VREPIH vr1, imm2
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VREPI \vr1, \imm2, 1
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.endm
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.macro VREPIF vr1, imm2
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VREPI \vr1, \imm2, 2
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.endm
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.macro VREPIG vr1, imm2
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VREP \vr1, \imm2, 3
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.endm
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/* VECTOR ADD */
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.macro VA vr1, vr2, vr3, m4
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VX_NUM v1, \vr1
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VX_NUM v2, \vr2
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VX_NUM v3, \vr3
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.word 0xE700 | ((v1&15) << 4) | (v2&15)
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.word ((v3&15) << 12)
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MRXBOPC \m4, 0xF3, v1, v2, v3
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.endm
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.macro VAB vr1, vr2, vr3
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VA \vr1, \vr2, \vr3, 0
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.endm
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.macro VAH vr1, vr2, vr3
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VA \vr1, \vr2, \vr3, 1
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.endm
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.macro VAF vr1, vr2, vr3
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VA \vr1, \vr2, \vr3, 2
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.endm
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.macro VAG vr1, vr2, vr3
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VA \vr1, \vr2, \vr3, 3
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.endm
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.macro VAQ vr1, vr2, vr3
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VA \vr1, \vr2, \vr3, 4
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.endm
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/* VECTOR ELEMENT SHIFT RIGHT ARITHMETIC */
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.macro VESRAV vr1, vr2, vr3, m4
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VX_NUM v1, \vr1
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VX_NUM v2, \vr2
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VX_NUM v3, \vr3
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.word 0xE700 | ((v1&15) << 4) | (v2&15)
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.word ((v3&15) << 12)
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MRXBOPC \m4, 0x7A, v1, v2, v3
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.endm
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.macro VESRAVB vr1, vr2, vr3
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VESRAV \vr1, \vr2, \vr3, 0
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.endm
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.macro VESRAVH vr1, vr2, vr3
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VESRAV \vr1, \vr2, \vr3, 1
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.endm
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.macro VESRAVF vr1, vr2, vr3
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VESRAV \vr1, \vr2, \vr3, 2
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.endm
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.macro VESRAVG vr1, vr2, vr3
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VESRAV \vr1, \vr2, \vr3, 3
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.endm
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_S390_VX_INSN_H */
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@ -103,6 +103,7 @@ extern const struct raid6_calls raid6_avx2x1;
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extern const struct raid6_calls raid6_avx2x2;
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extern const struct raid6_calls raid6_avx2x4;
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extern const struct raid6_calls raid6_tilegx8;
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extern const struct raid6_calls raid6_s390vx8;
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struct raid6_recov_calls {
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void (*data2)(int, size_t, int, int, void **);
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1
lib/raid6/.gitignore
vendored
1
lib/raid6/.gitignore
vendored
@ -3,3 +3,4 @@ altivec*.c
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int*.c
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tables.c
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neon?.c
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s390vx?.c
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@ -7,6 +7,7 @@ raid6_pq-$(CONFIG_X86) += recov_ssse3.o recov_avx2.o mmx.o sse1.o sse2.o avx2.o
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raid6_pq-$(CONFIG_ALTIVEC) += altivec1.o altivec2.o altivec4.o altivec8.o
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raid6_pq-$(CONFIG_KERNEL_MODE_NEON) += neon.o neon1.o neon2.o neon4.o neon8.o
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raid6_pq-$(CONFIG_TILEGX) += tilegx8.o
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raid6_pq-$(CONFIG_S390) += s390vx8.o
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hostprogs-y += mktables
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@ -116,6 +117,11 @@ $(obj)/tilegx8.c: UNROLL := 8
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$(obj)/tilegx8.c: $(src)/tilegx.uc $(src)/unroll.awk FORCE
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$(call if_changed,unroll)
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targets += s390vx8.c
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$(obj)/s390vx8.c: UNROLL := 8
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$(obj)/s390vx8.c: $(src)/s390vx.uc $(src)/unroll.awk FORCE
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$(call if_changed,unroll)
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quiet_cmd_mktable = TABLE $@
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cmd_mktable = $(obj)/mktables > $@ || ( rm -f $@ && exit 1 )
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@ -68,6 +68,9 @@ const struct raid6_calls * const raid6_algos[] = {
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#endif
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#if defined(CONFIG_TILEGX)
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&raid6_tilegx8,
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#endif
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#if defined(CONFIG_S390)
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&raid6_s390vx8,
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#endif
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&raid6_intx1,
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&raid6_intx2,
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168
lib/raid6/s390vx.uc
Normal file
168
lib/raid6/s390vx.uc
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@ -0,0 +1,168 @@
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/*
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* raid6_vx$#.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, int n, u8 *ptr)
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{
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typedef struct { u8 _[16*n]; } addrtype;
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register addrtype *__ptr asm("1") = (addrtype *) ptr;
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asm volatile ("VLM %2,%3,0,%r1"
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: : "m" (*__ptr), "a" (__ptr), "i" (x), "i" (x + n - 1));
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}
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static inline void STORE_DATA(int x, int n, u8 *ptr)
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{
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typedef struct { u8 _[16*n]; } 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), "i" (x + n - 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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