diff options
Diffstat (limited to 'lib/raid6')
| -rw-r--r-- | lib/raid6/.gitignore | 1 | ||||
| -rw-r--r-- | lib/raid6/Makefile | 40 | ||||
| -rw-r--r-- | lib/raid6/algos.c | 6 | ||||
| -rw-r--r-- | lib/raid6/neon.c | 58 | ||||
| -rw-r--r-- | lib/raid6/neon.uc | 80 | ||||
| -rw-r--r-- | lib/raid6/test/Makefile | 26 |
6 files changed, 210 insertions, 1 deletions
diff --git a/lib/raid6/.gitignore b/lib/raid6/.gitignore index 162becacf97..0a7e494b2bc 100644 --- a/lib/raid6/.gitignore +++ b/lib/raid6/.gitignore @@ -2,3 +2,4 @@ mktables altivec*.c int*.c tables.c +neon?.c diff --git a/lib/raid6/Makefile b/lib/raid6/Makefile index 9f7c184725d..b4625787c7e 100644 --- a/lib/raid6/Makefile +++ b/lib/raid6/Makefile @@ -5,6 +5,7 @@ raid6_pq-y += algos.o recov.o tables.o int1.o int2.o int4.o \ raid6_pq-$(CONFIG_X86) += recov_ssse3.o recov_avx2.o mmx.o sse1.o sse2.o avx2.o raid6_pq-$(CONFIG_ALTIVEC) += altivec1.o altivec2.o altivec4.o altivec8.o +raid6_pq-$(CONFIG_KERNEL_MODE_NEON) += neon.o neon1.o neon2.o neon4.o neon8.o hostprogs-y += mktables @@ -16,6 +17,21 @@ ifeq ($(CONFIG_ALTIVEC),y) altivec_flags := -maltivec -mabi=altivec endif +# The GCC option -ffreestanding is required in order to compile code containing +# ARM/NEON intrinsics in a non C99-compliant environment (such as the kernel) +ifeq ($(CONFIG_KERNEL_MODE_NEON),y) +NEON_FLAGS := -ffreestanding +ifeq ($(ARCH),arm) +NEON_FLAGS += -mfloat-abi=softfp -mfpu=neon +endif +ifeq ($(ARCH),arm64) +CFLAGS_REMOVE_neon1.o += -mgeneral-regs-only +CFLAGS_REMOVE_neon2.o += -mgeneral-regs-only +CFLAGS_REMOVE_neon4.o += -mgeneral-regs-only +CFLAGS_REMOVE_neon8.o += -mgeneral-regs-only +endif +endif + targets += int1.c $(obj)/int1.c: UNROLL := 1 $(obj)/int1.c: $(src)/int.uc $(src)/unroll.awk FORCE @@ -70,6 +86,30 @@ $(obj)/altivec8.c: UNROLL := 8 $(obj)/altivec8.c: $(src)/altivec.uc $(src)/unroll.awk FORCE $(call if_changed,unroll) +CFLAGS_neon1.o += $(NEON_FLAGS) +targets += neon1.c +$(obj)/neon1.c: UNROLL := 1 +$(obj)/neon1.c: $(src)/neon.uc $(src)/unroll.awk FORCE + $(call if_changed,unroll) + +CFLAGS_neon2.o += $(NEON_FLAGS) +targets += neon2.c +$(obj)/neon2.c: UNROLL := 2 +$(obj)/neon2.c: $(src)/neon.uc $(src)/unroll.awk FORCE + $(call if_changed,unroll) + +CFLAGS_neon4.o += $(NEON_FLAGS) +targets += neon4.c +$(obj)/neon4.c: UNROLL := 4 +$(obj)/neon4.c: $(src)/neon.uc $(src)/unroll.awk FORCE + $(call if_changed,unroll) + +CFLAGS_neon8.o += $(NEON_FLAGS) +targets += neon8.c +$(obj)/neon8.c: UNROLL := 8 +$(obj)/neon8.c: $(src)/neon.uc $(src)/unroll.awk FORCE + $(call if_changed,unroll) + quiet_cmd_mktable = TABLE $@ cmd_mktable = $(obj)/mktables > $@ || ( rm -f $@ && exit 1 ) diff --git a/lib/raid6/algos.c b/lib/raid6/algos.c index 6d7316fe9f3..74e6f5629db 100644 --- a/lib/raid6/algos.c +++ b/lib/raid6/algos.c @@ -70,6 +70,12 @@ const struct raid6_calls * const raid6_algos[] = { &raid6_intx2, &raid6_intx4, &raid6_intx8, +#ifdef CONFIG_KERNEL_MODE_NEON + &raid6_neonx1, + &raid6_neonx2, + &raid6_neonx4, + &raid6_neonx8, +#endif NULL }; diff --git a/lib/raid6/neon.c b/lib/raid6/neon.c new file mode 100644 index 00000000000..36ad4705df1 --- /dev/null +++ b/lib/raid6/neon.c @@ -0,0 +1,58 @@ +/* + * linux/lib/raid6/neon.c - RAID6 syndrome calculation using ARM NEON intrinsics + * + * Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/raid/pq.h> + +#ifdef __KERNEL__ +#include <asm/neon.h> +#else +#define kernel_neon_begin() +#define kernel_neon_end() +#define cpu_has_neon() (1) +#endif + +/* + * There are 2 reasons these wrappers are kept in a separate compilation unit + * from the actual implementations in neonN.c (generated from neon.uc by + * unroll.awk): + * - the actual implementations use NEON intrinsics, and the GCC support header + * (arm_neon.h) is not fully compatible (type wise) with the kernel; + * - the neonN.c files are compiled with -mfpu=neon and optimization enabled, + * and we have to make sure that we never use *any* NEON/VFP instructions + * outside a kernel_neon_begin()/kernel_neon_end() pair. + */ + +#define RAID6_NEON_WRAPPER(_n) \ + static void raid6_neon ## _n ## _gen_syndrome(int disks, \ + size_t bytes, void **ptrs) \ + { \ + void raid6_neon ## _n ## _gen_syndrome_real(int, \ + unsigned long, void**); \ + kernel_neon_begin(); \ + raid6_neon ## _n ## _gen_syndrome_real(disks, \ + (unsigned long)bytes, ptrs); \ + kernel_neon_end(); \ + } \ + struct raid6_calls const raid6_neonx ## _n = { \ + raid6_neon ## _n ## _gen_syndrome, \ + raid6_have_neon, \ + "neonx" #_n, \ + 0 \ + } + +static int raid6_have_neon(void) +{ + return cpu_has_neon(); +} + +RAID6_NEON_WRAPPER(1); +RAID6_NEON_WRAPPER(2); +RAID6_NEON_WRAPPER(4); +RAID6_NEON_WRAPPER(8); diff --git a/lib/raid6/neon.uc b/lib/raid6/neon.uc new file mode 100644 index 00000000000..1b9ed793342 --- /dev/null +++ b/lib/raid6/neon.uc @@ -0,0 +1,80 @@ +/* ----------------------------------------------------------------------- + * + * neon.uc - RAID-6 syndrome calculation using ARM NEON instructions + * + * Copyright (C) 2012 Rob Herring + * + * Based on altivec.uc: + * Copyright 2002-2004 H. Peter Anvin - All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, Inc., 53 Temple Place Ste 330, + * Boston MA 02111-1307, USA; either version 2 of the License, or + * (at your option) any later version; incorporated herein by reference. + * + * ----------------------------------------------------------------------- */ + +/* + * neon$#.c + * + * $#-way unrolled NEON intrinsics math RAID-6 instruction set + * + * This file is postprocessed using unroll.awk + */ + +#include <arm_neon.h> + +typedef uint8x16_t unative_t; + +#define NBYTES(x) ((unative_t){x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x}) +#define NSIZE sizeof(unative_t) + +/* + * The SHLBYTE() operation shifts each byte left by 1, *not* + * rolling over into the next byte + */ +static inline unative_t SHLBYTE(unative_t v) +{ + return vshlq_n_u8(v, 1); +} + +/* + * The MASK() operation returns 0xFF in any byte for which the high + * bit is 1, 0x00 for any byte for which the high bit is 0. + */ +static inline unative_t MASK(unative_t v) +{ + const uint8x16_t temp = NBYTES(0); + return (unative_t)vcltq_s8((int8x16_t)v, (int8x16_t)temp); +} + +void raid6_neon$#_gen_syndrome_real(int disks, unsigned long bytes, void **ptrs) +{ + uint8_t **dptr = (uint8_t **)ptrs; + uint8_t *p, *q; + int d, z, z0; + + register unative_t wd$$, wq$$, wp$$, w1$$, w2$$; + const unative_t x1d = NBYTES(0x1d); + + z0 = disks - 3; /* Highest data disk */ + p = dptr[z0+1]; /* XOR parity */ + q = dptr[z0+2]; /* RS syndrome */ + + for ( d = 0 ; d < bytes ; d += NSIZE*$# ) { + wq$$ = wp$$ = vld1q_u8(&dptr[z0][d+$$*NSIZE]); + for ( z = z0-1 ; z >= 0 ; z-- ) { + wd$$ = vld1q_u8(&dptr[z][d+$$*NSIZE]); + wp$$ = veorq_u8(wp$$, wd$$); + w2$$ = MASK(wq$$); + w1$$ = SHLBYTE(wq$$); + + w2$$ = vandq_u8(w2$$, x1d); + w1$$ = veorq_u8(w1$$, w2$$); + wq$$ = veorq_u8(w1$$, wd$$); + } + vst1q_u8(&p[d+NSIZE*$$], wp$$); + vst1q_u8(&q[d+NSIZE*$$], wq$$); + } +} diff --git a/lib/raid6/test/Makefile b/lib/raid6/test/Makefile index 087332dbf8a..28afa1a06e0 100644 --- a/lib/raid6/test/Makefile +++ b/lib/raid6/test/Makefile @@ -22,11 +22,23 @@ ifeq ($(ARCH),x86_64) IS_X86 = yes endif +ifeq ($(ARCH),arm) + CFLAGS += -I../../../arch/arm/include -mfpu=neon + HAS_NEON = yes +endif +ifeq ($(ARCH),arm64) + CFLAGS += -I../../../arch/arm64/include + HAS_NEON = yes +endif + ifeq ($(IS_X86),yes) OBJS += mmx.o sse1.o sse2.o avx2.o recov_ssse3.o recov_avx2.o CFLAGS += $(shell echo "vpbroadcastb %xmm0, %ymm1" | \ gcc -c -x assembler - >&/dev/null && \ rm ./-.o && echo -DCONFIG_AS_AVX2=1) +else ifeq ($(HAS_NEON),yes) + OBJS += neon.o neon1.o neon2.o neon4.o neon8.o + CFLAGS += -DCONFIG_KERNEL_MODE_NEON=1 else HAS_ALTIVEC := $(shell echo -e '\#include <altivec.h>\nvector int a;' |\ gcc -c -x c - >&/dev/null && \ @@ -55,6 +67,18 @@ raid6.a: $(OBJS) raid6test: test.c raid6.a $(CC) $(CFLAGS) -o raid6test $^ +neon1.c: neon.uc ../unroll.awk + $(AWK) ../unroll.awk -vN=1 < neon.uc > $@ + +neon2.c: neon.uc ../unroll.awk + $(AWK) ../unroll.awk -vN=2 < neon.uc > $@ + +neon4.c: neon.uc ../unroll.awk + $(AWK) ../unroll.awk -vN=4 < neon.uc > $@ + +neon8.c: neon.uc ../unroll.awk + $(AWK) ../unroll.awk -vN=8 < neon.uc > $@ + altivec1.c: altivec.uc ../unroll.awk $(AWK) ../unroll.awk -vN=1 < altivec.uc > $@ @@ -89,7 +113,7 @@ tables.c: mktables ./mktables > tables.c clean: - rm -f *.o *.a mktables mktables.c *.uc int*.c altivec*.c tables.c raid6test + rm -f *.o *.a mktables mktables.c *.uc int*.c altivec*.c neon*.c tables.c raid6test spotless: clean rm -f *~ |