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#ifndef _ASM_X86_XOR_AVX_H
#define _ASM_X86_XOR_AVX_H
/*
* Optimized RAID-5 checksumming functions for AVX
*
* Copyright (C) 2012 Intel Corporation
* Author: Jim Kukunas <james.t.kukunas@linux.intel.com>
*
* Based on Ingo Molnar and Zach Brown's respective MMX and SSE routines
*
* 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; version 2
* of the License.
*/
#ifdef CONFIG_AS_AVX
#include <linux/compiler.h>
#include <asm/i387.h>
#define ALIGN32 __aligned(32)
#define YMM_SAVED_REGS 4
#define YMMS_SAVE \
do { \
preempt_disable(); \
cr0 = read_cr0(); \
clts(); \
asm volatile("vmovaps %%ymm0, %0" : "=m" (ymm_save[0]) : : "memory"); \
asm volatile("vmovaps %%ymm1, %0" : "=m" (ymm_save[32]) : : "memory"); \
asm volatile("vmovaps %%ymm2, %0" : "=m" (ymm_save[64]) : : "memory"); \
asm volatile("vmovaps %%ymm3, %0" : "=m" (ymm_save[96]) : : "memory"); \
} while (0);
#define YMMS_RESTORE \
do { \
asm volatile("sfence" : : : "memory"); \
asm volatile("vmovaps %0, %%ymm3" : : "m" (ymm_save[96])); \
asm volatile("vmovaps %0, %%ymm2" : : "m" (ymm_save[64])); \
asm volatile("vmovaps %0, %%ymm1" : : "m" (ymm_save[32])); \
asm volatile("vmovaps %0, %%ymm0" : : "m" (ymm_save[0])); \
write_cr0(cr0); \
preempt_enable(); \
} while (0);
#define BLOCK4(i) \
BLOCK(32 * i, 0) \
BLOCK(32 * (i + 1), 1) \
BLOCK(32 * (i + 2), 2) \
BLOCK(32 * (i + 3), 3)
#define BLOCK16() \
BLOCK4(0) \
BLOCK4(4) \
BLOCK4(8) \
BLOCK4(12)
static void xor_avx_2(unsigned long bytes, unsigned long *p0, unsigned long *p1)
{
unsigned long cr0, lines = bytes >> 9;
char ymm_save[32 * YMM_SAVED_REGS] ALIGN32;
YMMS_SAVE
while (lines--) {
#undef BLOCK
#define BLOCK(i, reg) \
do { \
asm volatile("vmovdqa %0, %%ymm" #reg : : "m" (p1[i / sizeof(*p1)])); \
asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
"m" (p0[i / sizeof(*p0)])); \
asm volatile("vmovdqa %%ymm" #reg ", %0" : \
"=m" (p0[i / sizeof(*p0)])); \
} while (0);
BLOCK16()
p0 = (unsigned long *)((uintptr_t)p0 + 512);
p1 = (unsigned long *)((uintptr_t)p1 + 512);
}
YMMS_RESTORE
}
static void xor_avx_3(unsigned long bytes, unsigned long *p0, unsigned long *p1,
unsigned long *p2)
{
unsigned long cr0, lines = bytes >> 9;
char ymm_save[32 * YMM_SAVED_REGS] ALIGN32;
YMMS_SAVE
while (lines--) {
#undef BLOCK
#define BLOCK(i, reg) \
do { \
asm volatile("vmovdqa %0, %%ymm" #reg : : "m" (p2[i / sizeof(*p2)])); \
asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
"m" (p1[i / sizeof(*p1)])); \
asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
"m" (p0[i / sizeof(*p0)])); \
asm volatile("vmovdqa %%ymm" #reg ", %0" : \
"=m" (p0[i / sizeof(*p0)])); \
} while (0);
BLOCK16()
p0 = (unsigned long *)((uintptr_t)p0 + 512);
p1 = (unsigned long *)((uintptr_t)p1 + 512);
p2 = (unsigned long *)((uintptr_t)p2 + 512);
}
YMMS_RESTORE
}
static void xor_avx_4(unsigned long bytes, unsigned long *p0, unsigned long *p1,
unsigned long *p2, unsigned long *p3)
{
unsigned long cr0, lines = bytes >> 9;
char ymm_save[32 * YMM_SAVED_REGS] ALIGN32;
YMMS_SAVE
while (lines--) {
#undef BLOCK
#define BLOCK(i, reg) \
do { \
asm volatile("vmovdqa %0, %%ymm" #reg : : "m" (p3[i / sizeof(*p3)])); \
asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
"m" (p2[i / sizeof(*p2)])); \
asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
"m" (p1[i / sizeof(*p1)])); \
asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
"m" (p0[i / sizeof(*p0)])); \
asm volatile("vmovdqa %%ymm" #reg ", %0" : \
"=m" (p0[i / sizeof(*p0)])); \
} while (0);
BLOCK16();
p0 = (unsigned long *)((uintptr_t)p0 + 512);
p1 = (unsigned long *)((uintptr_t)p1 + 512);
p2 = (unsigned long *)((uintptr_t)p2 + 512);
p3 = (unsigned long *)((uintptr_t)p3 + 512);
}
YMMS_RESTORE
}
static void xor_avx_5(unsigned long bytes, unsigned long *p0, unsigned long *p1,
unsigned long *p2, unsigned long *p3, unsigned long *p4)
{
unsigned long cr0, lines = bytes >> 9;
char ymm_save[32 * YMM_SAVED_REGS] ALIGN32;
YMMS_SAVE
while (lines--) {
#undef BLOCK
#define BLOCK(i, reg) \
do { \
asm volatile("vmovdqa %0, %%ymm" #reg : : "m" (p4[i / sizeof(*p4)])); \
asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
"m" (p3[i / sizeof(*p3)])); \
asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
"m" (p2[i / sizeof(*p2)])); \
asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
"m" (p1[i / sizeof(*p1)])); \
asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
"m" (p0[i / sizeof(*p0)])); \
asm volatile("vmovdqa %%ymm" #reg ", %0" : \
"=m" (p0[i / sizeof(*p0)])); \
} while (0);
BLOCK16()
p0 = (unsigned long *)((uintptr_t)p0 + 512);
p1 = (unsigned long *)((uintptr_t)p1 + 512);
p2 = (unsigned long *)((uintptr_t)p2 + 512);
p3 = (unsigned long *)((uintptr_t)p3 + 512);
p4 = (unsigned long *)((uintptr_t)p4 + 512);
}
YMMS_RESTORE
}
static struct xor_block_template xor_block_avx = {
.name = "avx",
.do_2 = xor_avx_2,
.do_3 = xor_avx_3,
.do_4 = xor_avx_4,
.do_5 = xor_avx_5,
};
#define AVX_XOR_SPEED \
do { \
if (cpu_has_avx) \
xor_speed(&xor_block_avx); \
} while (0)
#define AVX_SELECT(FASTEST) \
(cpu_has_avx ? &xor_block_avx : FASTEST)
#else
#define AVX_XOR_SPEED {}
#define AVX_SELECT(FASTEST) (FASTEST)
#endif
#endif
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