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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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7056741fd9
Optimize RAID6 recovery functions to take advantage of the 256-bit YMM integer instructions introduced in AVX2. The patch was tested and benchmarked before submission. However hardware is not yet released so benchmark numbers cannot be reported. Acked-by: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2002-2004 H. Peter Anvin - All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
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* Boston MA 02111-1307, USA; either version 2 of the License, or
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* (at your option) any later version; incorporated herein by reference.
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*
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* ----------------------------------------------------------------------- */
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/*
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* raid6/x86.h
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*
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* Definitions common to x86 and x86-64 RAID-6 code only
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*/
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#ifndef LINUX_RAID_RAID6X86_H
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#define LINUX_RAID_RAID6X86_H
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#if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)
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#ifdef __KERNEL__ /* Real code */
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#include <asm/i387.h>
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#else /* Dummy code for user space testing */
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static inline void kernel_fpu_begin(void)
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{
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}
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static inline void kernel_fpu_end(void)
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{
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}
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#define __aligned(x) __attribute__((aligned(x)))
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#define X86_FEATURE_MMX (0*32+23) /* Multimedia Extensions */
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#define X86_FEATURE_FXSR (0*32+24) /* FXSAVE and FXRSTOR instructions
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* (fast save and restore) */
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#define X86_FEATURE_XMM (0*32+25) /* Streaming SIMD Extensions */
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#define X86_FEATURE_XMM2 (0*32+26) /* Streaming SIMD Extensions-2 */
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#define X86_FEATURE_XMM3 (4*32+ 0) /* "pni" SSE-3 */
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#define X86_FEATURE_SSSE3 (4*32+ 9) /* Supplemental SSE-3 */
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#define X86_FEATURE_AVX (4*32+28) /* Advanced Vector Extensions */
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#define X86_FEATURE_AVX2 (9*32+ 5) /* AVX2 instructions */
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#define X86_FEATURE_MMXEXT (1*32+22) /* AMD MMX extensions */
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/* Should work well enough on modern CPUs for testing */
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static inline int boot_cpu_has(int flag)
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{
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u32 eax, ebx, ecx, edx;
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eax = (flag & 0x100) ? 7 :
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(flag & 0x20) ? 0x80000001 : 1;
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ecx = 0;
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asm volatile("cpuid"
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: "+a" (eax), "=b" (ebx), "=d" (edx), "+c" (ecx));
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return ((flag & 0x100 ? ebx :
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(flag & 0x80) ? ecx : edx) >> (flag & 31)) & 1;
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}
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#endif /* ndef __KERNEL__ */
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#endif
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#endif
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