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freebsd-dev/module/zfs/vdev_raidz_math_avx512bw.c
Romain Dolbeau 7f547f85fe Add parity generation/rebuild using AVX-512 for x86-64 
avx512f should work on all AVX512 hardware, since it only uses
Foundation instructions.

avx512bw should be faster on hardware supporting the AVW512BW
extension. We can use full-width pshufb (instead of relying on the 256
bits AVX2 pshufb). As a side-effect, the code is also unrolled more.

Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Gvozden Neskovic <neskovic@gmail.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Romain Dolbeau <romain.github@dolbeau.name>
Closes #5219
2016-11-02 12:40:23 -07:00

429 lines
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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (C) 2016 Romain Dolbeau. All rights reserved.
*/
#include <sys/isa_defs.h>
#if defined(__x86_64) && defined(HAVE_AVX512BW)
#include <sys/types.h>
#include <linux/simd_x86.h>
#define __asm __asm__ __volatile__
#define _REG_CNT(_0, _1, _2, _3, _4, _5, _6, _7, N, ...) N
#define REG_CNT(r...) _REG_CNT(r, 8, 7, 6, 5, 4, 3, 2, 1)
#define VR0_(REG, ...) "zmm"#REG
#define VR1_(_1, REG, ...) "zmm"#REG
#define VR2_(_1, _2, REG, ...) "zmm"#REG
#define VR3_(_1, _2, _3, REG, ...) "zmm"#REG
#define VR4_(_1, _2, _3, _4, REG, ...) "zmm"#REG
#define VR5_(_1, _2, _3, _4, _5, REG, ...) "zmm"#REG
#define VR6_(_1, _2, _3, _4, _5, _6, REG, ...) "zmm"#REG
#define VR7_(_1, _2, _3, _4, _5, _6, _7, REG, ...) "zmm"#REG
#define VR0(r...) VR0_(r)
#define VR1(r...) VR1_(r)
#define VR2(r...) VR2_(r, 1)
#define VR3(r...) VR3_(r, 1, 2)
#define VR4(r...) VR4_(r, 1, 2)
#define VR5(r...) VR5_(r, 1, 2, 3)
#define VR6(r...) VR6_(r, 1, 2, 3, 4)
#define VR7(r...) VR7_(r, 1, 2, 3, 4, 5)
#define R_01(REG1, REG2, ...) REG1, REG2
#define _R_23(_0, _1, REG2, REG3, ...) REG2, REG3
#define R_23(REG...) _R_23(REG, 1, 2, 3)
#define ASM_BUG() ASSERT(0)
extern const uint8_t gf_clmul_mod_lt[4*256][16];
#define ELEM_SIZE 64
typedef struct v {
uint8_t b[ELEM_SIZE] __attribute__((aligned(ELEM_SIZE)));
} v_t;
#define PREFETCHNTA(ptr, offset) \
{ \
__asm( \
"prefetchnta " #offset "(%[MEM])\n" \
: : [MEM] "r" (ptr)); \
}
#define PREFETCH(ptr, offset) \
{ \
__asm( \
"prefetcht0 " #offset "(%[MEM])\n" \
: : [MEM] "r" (ptr)); \
}
#define XOR_ACC(src, r...) \
{ \
switch (REG_CNT(r)) { \
case 4: \
__asm( \
"vpxorq 0x00(%[SRC]), %%" VR0(r)", %%" VR0(r) "\n" \
"vpxorq 0x40(%[SRC]), %%" VR1(r)", %%" VR1(r) "\n" \
"vpxorq 0x80(%[SRC]), %%" VR2(r)", %%" VR2(r) "\n" \
"vpxorq 0xc0(%[SRC]), %%" VR3(r)", %%" VR3(r) "\n" \
: : [SRC] "r" (src)); \
break; \
case 2: \
__asm( \
"vpxorq 0x00(%[SRC]), %%" VR0(r)", %%" VR0(r) "\n" \
"vpxorq 0x40(%[SRC]), %%" VR1(r)", %%" VR1(r) "\n" \
: : [SRC] "r" (src)); \
break; \
default: \
ASM_BUG(); \
} \
}
#define XOR(r...) \
{ \
switch (REG_CNT(r)) { \
case 8: \
__asm( \
"vpxorq %" VR0(r) ", %" VR4(r)", %" VR4(r) "\n" \
"vpxorq %" VR1(r) ", %" VR5(r)", %" VR5(r) "\n" \
"vpxorq %" VR2(r) ", %" VR6(r)", %" VR6(r) "\n" \
"vpxorq %" VR3(r) ", %" VR7(r)", %" VR7(r)); \
break; \
case 4: \
__asm( \
"vpxorq %" VR0(r) ", %" VR2(r)", %" VR2(r) "\n" \
"vpxorq %" VR1(r) ", %" VR3(r)", %" VR3(r)); \
break; \
default: \
ASM_BUG(); \
} \
}
#define ZERO(r...) \
{ \
switch (REG_CNT(r)) { \
case 4: \
__asm( \
"vpxorq %" VR0(r) ", %" VR0(r)", %" VR0(r) "\n" \
"vpxorq %" VR1(r) ", %" VR1(r)", %" VR1(r) "\n" \
"vpxorq %" VR2(r) ", %" VR2(r)", %" VR2(r) "\n" \
"vpxorq %" VR3(r) ", %" VR3(r)", %" VR3(r)); \
break; \
case 2: \
__asm( \
"vpxorq %" VR0(r) ", %" VR0(r)", %" VR0(r) "\n" \
"vpxorq %" VR1(r) ", %" VR1(r)", %" VR1(r)); \
break; \
default: \
ASM_BUG(); \
} \
}
#define COPY(r...) \
{ \
switch (REG_CNT(r)) { \
case 8: \
__asm( \
"vmovdqa64 %" VR0(r) ", %" VR4(r) "\n" \
"vmovdqa64 %" VR1(r) ", %" VR5(r) "\n" \
"vmovdqa64 %" VR2(r) ", %" VR6(r) "\n" \
"vmovdqa64 %" VR3(r) ", %" VR7(r)); \
break; \
case 4: \
__asm( \
"vmovdqa64 %" VR0(r) ", %" VR2(r) "\n" \
"vmovdqa64 %" VR1(r) ", %" VR3(r)); \
break; \
default: \
ASM_BUG(); \
} \
}
#define LOAD(src, r...) \
{ \
switch (REG_CNT(r)) { \
case 4: \
__asm( \
"vmovdqa64 0x00(%[SRC]), %%" VR0(r) "\n" \
"vmovdqa64 0x40(%[SRC]), %%" VR1(r) "\n" \
"vmovdqa64 0x80(%[SRC]), %%" VR2(r) "\n" \
"vmovdqa64 0xc0(%[SRC]), %%" VR3(r) "\n" \
: : [SRC] "r" (src)); \
break; \
case 2: \
__asm( \
"vmovdqa64 0x00(%[SRC]), %%" VR0(r) "\n" \
"vmovdqa64 0x40(%[SRC]), %%" VR1(r) "\n" \
: : [SRC] "r" (src)); \
break; \
default: \
ASM_BUG(); \
} \
}
#define STORE(dst, r...) \
{ \
switch (REG_CNT(r)) { \
case 4: \
__asm( \
"vmovdqa64 %%" VR0(r) ", 0x00(%[DST])\n" \
"vmovdqa64 %%" VR1(r) ", 0x40(%[DST])\n" \
"vmovdqa64 %%" VR2(r) ", 0x80(%[DST])\n" \
"vmovdqa64 %%" VR3(r) ", 0xc0(%[DST])\n" \
: : [DST] "r" (dst)); \
break; \
case 2: \
__asm( \
"vmovdqa64 %%" VR0(r) ", 0x00(%[DST])\n" \
"vmovdqa64 %%" VR1(r) ", 0x40(%[DST])\n" \
: : [DST] "r" (dst)); \
break; \
default: \
ASM_BUG(); \
} \
}
#define FLUSH() \
{ \
__asm("vzeroupper"); \
}
#define MUL2_SETUP() \
{ \
__asm("vmovq %0, %%xmm14" :: "r"(0x1d1d1d1d1d1d1d1d)); \
__asm("vpbroadcastq %xmm14, %zmm14"); \
__asm("vmovq %0, %%xmm13" :: "r"(0x8080808080808080)); \
__asm("vpbroadcastq %xmm13, %zmm13"); \
__asm("vmovq %0, %%xmm12" :: "r"(0xfefefefefefefefe)); \
__asm("vpbroadcastq %xmm12, %zmm12"); \
__asm("vpxorq %zmm15, %zmm15 ,%zmm15"); \
}
#define _MUL2(r...) \
{ \
switch (REG_CNT(r)) { \
case 2: \
__asm( \
"vpandq %" VR0(r)", %zmm13, %zmm10\n" \
"vpandq %" VR1(r)", %zmm13, %zmm11\n" \
"vpsrlq $7, %zmm10, %zmm8\n" \
"vpsrlq $7, %zmm11, %zmm9\n" \
"vpsllq $1, %zmm10, %zmm10\n" \
"vpsllq $1, %zmm11, %zmm11\n" \
"vpsubq %zmm8, %zmm10, %zmm10\n" \
"vpsubq %zmm9, %zmm11, %zmm11\n" \
"vpsllq $1, %" VR0(r)", %" VR0(r) "\n" \
"vpsllq $1, %" VR1(r)", %" VR1(r) "\n" \
"vpandq %zmm10, %zmm14, %zmm10\n" \
"vpandq %zmm11, %zmm14, %zmm11\n" \
"vpternlogd $0x6c,%zmm12, %zmm10, %" VR0(r) "\n" \
"vpternlogd $0x6c,%zmm12, %zmm11, %" VR1(r)); \
break; \
default: \
ASM_BUG(); \
} \
}
#define MUL2(r...) \
{ \
switch (REG_CNT(r)) { \
case 4: \
_MUL2(R_01(r)); \
_MUL2(R_23(r)); \
break; \
case 2: \
_MUL2(r); \
break; \
default: \
ASM_BUG(); \
} \
}
#define MUL4(r...) \
{ \
MUL2(r); \
MUL2(r); \
}
#define _0f "zmm15"
#define _as "zmm14"
#define _bs "zmm13"
#define _ltmod "zmm12"
#define _ltmul "zmm11"
#define _ta "zmm10"
#define _tb "zmm15"
static const uint8_t __attribute__((aligned(32))) _mul_mask = 0x0F;
#define _MULx2(c, r...) \
{ \
switch (REG_CNT(r)) { \
case 2: \
__asm( \
"vpbroadcastb (%[mask]), %%" _0f "\n" \
/* upper bits */ \
"vbroadcasti32x4 0x00(%[lt]), %%" _ltmod "\n" \
"vbroadcasti32x4 0x10(%[lt]), %%" _ltmul "\n" \
\
"vpsraw $0x4, %%" VR0(r) ", %%"_as "\n" \
"vpsraw $0x4, %%" VR1(r) ", %%"_bs "\n" \
"vpandq %%" _0f ", %%" VR0(r) ", %%" VR0(r) "\n" \
"vpandq %%" _0f ", %%" VR1(r) ", %%" VR1(r) "\n" \
"vpandq %%" _0f ", %%" _as ", %%" _as "\n" \
"vpandq %%" _0f ", %%" _bs ", %%" _bs "\n" \
\
"vpshufb %%" _as ", %%" _ltmod ", %%" _ta "\n" \
"vpshufb %%" _bs ", %%" _ltmod ", %%" _tb "\n" \
"vpshufb %%" _as ", %%" _ltmul ", %%" _as "\n" \
"vpshufb %%" _bs ", %%" _ltmul ", %%" _bs "\n" \
/* lower bits */ \
"vbroadcasti32x4 0x20(%[lt]), %%" _ltmod "\n" \
"vbroadcasti32x4 0x30(%[lt]), %%" _ltmul "\n" \
\
"vpxorq %%" _ta ", %%" _as ", %%" _as "\n" \
"vpxorq %%" _tb ", %%" _bs ", %%" _bs "\n" \
\
"vpshufb %%" VR0(r) ", %%" _ltmod ", %%" _ta "\n" \
"vpshufb %%" VR1(r) ", %%" _ltmod ", %%" _tb "\n" \
"vpshufb %%" VR0(r) ", %%" _ltmul ", %%" VR0(r) "\n"\
"vpshufb %%" VR1(r) ", %%" _ltmul ", %%" VR1(r) "\n"\
\
"vpxorq %%" _ta ", %%" VR0(r) ", %%" VR0(r) "\n" \
"vpxorq %%" _as ", %%" VR0(r) ", %%" VR0(r) "\n" \
"vpxorq %%" _tb ", %%" VR1(r) ", %%" VR1(r) "\n" \
"vpxorq %%" _bs ", %%" VR1(r) ", %%" VR1(r) "\n" \
: : [mask] "r" (&_mul_mask), \
[lt] "r" (gf_clmul_mod_lt[4*(c)])); \
break; \
default: \
ASM_BUG(); \
} \
}
#define MUL(c, r...) \
{ \
switch (REG_CNT(r)) { \
case 4: \
_MULx2(c, R_01(r)); \
_MULx2(c, R_23(r)); \
break; \
case 2: \
_MULx2(c, R_01(r)); \
break; \
default: \
ASM_BUG(); \
} \
}
#define raidz_math_begin() kfpu_begin()
#define raidz_math_end() \
{ \
FLUSH(); \
kfpu_end(); \
}
#define GEN_P_DEFINE() {}
#define GEN_P_STRIDE 4
#define GEN_P_P 0, 1, 2, 3
#define GEN_PQ_DEFINE() {}
#define GEN_PQ_STRIDE 4
#define GEN_PQ_D 0, 1, 2, 3
#define GEN_PQ_P 4, 5, 6, 7
#define GEN_PQ_Q 20, 21, 22, 23
#define GEN_PQR_DEFINE() {}
#define GEN_PQR_STRIDE 2
#define GEN_PQR_D 0, 1
#define GEN_PQR_P 2, 3
#define GEN_PQR_Q 4, 5
#define GEN_PQR_R 6, 7
#define REC_P_DEFINE() {}
#define REC_P_STRIDE 4
#define REC_P_X 0, 1, 2, 3
#define REC_Q_DEFINE() {}
#define REC_Q_STRIDE 4
#define REC_Q_X 0, 1, 2, 3
#define REC_R_DEFINE() {}
#define REC_R_STRIDE 4
#define REC_R_X 0, 1, 2, 3
#define REC_PQ_DEFINE() {}
#define REC_PQ_STRIDE 4
#define REC_PQ_X 0, 1, 2, 3
#define REC_PQ_Y 4, 5, 6, 7
#define REC_PQ_D 20, 21, 22, 23
#define REC_PR_DEFINE() {}
#define REC_PR_STRIDE 4
#define REC_PR_X 0, 1, 2, 3
#define REC_PR_Y 4, 5, 6, 7
#define REC_PR_D 20, 21, 22, 23
#define REC_QR_DEFINE() {}
#define REC_QR_STRIDE 4
#define REC_QR_X 0, 1, 2, 3
#define REC_QR_Y 4, 5, 6, 7
#define REC_QR_D 20, 21, 22, 23
#define REC_PQR_DEFINE() {}
#define REC_PQR_STRIDE 2
#define REC_PQR_X 0, 1
#define REC_PQR_Y 2, 3
#define REC_PQR_Z 4, 5
#define REC_PQR_D 6, 7
#define REC_PQR_XS 6, 7
#define REC_PQR_YS 8, 9
#include <sys/vdev_raidz_impl.h>
#include "vdev_raidz_math_impl.h"
DEFINE_GEN_METHODS(avx512bw);
DEFINE_REC_METHODS(avx512bw);
static boolean_t
raidz_will_avx512bw_work(void)
{
return (zfs_avx_available() &&
zfs_avx512f_available() &&
zfs_avx512bw_available());
}
const raidz_impl_ops_t vdev_raidz_avx512bw_impl = {
.init = NULL,
.fini = NULL,
.gen = RAIDZ_GEN_METHODS(avx512bw),
.rec = RAIDZ_REC_METHODS(avx512bw),
.is_supported = &raidz_will_avx512bw_work,
.name = "avx512bw"
};
#endif /* defined(__x86_64) && defined(HAVE_AVX512BW) */
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