pq.h (6143B)
1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* -*- linux-c -*- ------------------------------------------------------- * 3 * 4 * Copyright 2003 H. Peter Anvin - All Rights Reserved 5 * 6 * ----------------------------------------------------------------------- */ 7 8#ifndef LINUX_RAID_RAID6_H 9#define LINUX_RAID_RAID6_H 10 11#ifdef __KERNEL__ 12 13/* Set to 1 to use kernel-wide empty_zero_page */ 14#define RAID6_USE_EMPTY_ZERO_PAGE 0 15#include <linux/blkdev.h> 16 17/* We need a pre-zeroed page... if we don't want to use the kernel-provided 18 one define it here */ 19#if RAID6_USE_EMPTY_ZERO_PAGE 20# define raid6_empty_zero_page empty_zero_page 21#else 22extern const char raid6_empty_zero_page[PAGE_SIZE]; 23#endif 24 25#else /* ! __KERNEL__ */ 26/* Used for testing in user space */ 27 28#include <errno.h> 29#include <inttypes.h> 30#include <stddef.h> 31#include <string.h> 32#include <sys/mman.h> 33#include <sys/time.h> 34#include <sys/types.h> 35 36/* Not standard, but glibc defines it */ 37#define BITS_PER_LONG __WORDSIZE 38 39typedef uint8_t u8; 40typedef uint16_t u16; 41typedef uint32_t u32; 42typedef uint64_t u64; 43 44#ifndef PAGE_SIZE 45# define PAGE_SIZE 4096 46#endif 47#ifndef PAGE_SHIFT 48# define PAGE_SHIFT 12 49#endif 50extern const char raid6_empty_zero_page[PAGE_SIZE]; 51 52#define __init 53#define __exit 54#ifndef __attribute_const__ 55# define __attribute_const__ __attribute__((const)) 56#endif 57#define noinline __attribute__((noinline)) 58 59#define preempt_enable() 60#define preempt_disable() 61#define cpu_has_feature(x) 1 62#define enable_kernel_altivec() 63#define disable_kernel_altivec() 64 65#undef EXPORT_SYMBOL 66#define EXPORT_SYMBOL(sym) 67#undef EXPORT_SYMBOL_GPL 68#define EXPORT_SYMBOL_GPL(sym) 69#define MODULE_LICENSE(licence) 70#define MODULE_DESCRIPTION(desc) 71#define subsys_initcall(x) 72#define module_exit(x) 73 74#define IS_ENABLED(x) (x) 75#define CONFIG_RAID6_PQ_BENCHMARK 1 76#endif /* __KERNEL__ */ 77 78/* Routine choices */ 79struct raid6_calls { 80 void (*gen_syndrome)(int, size_t, void **); 81 void (*xor_syndrome)(int, int, int, size_t, void **); 82 int (*valid)(void); /* Returns 1 if this routine set is usable */ 83 const char *name; /* Name of this routine set */ 84 int priority; /* Relative priority ranking if non-zero */ 85}; 86 87/* Selected algorithm */ 88extern struct raid6_calls raid6_call; 89 90/* Various routine sets */ 91extern const struct raid6_calls raid6_intx1; 92extern const struct raid6_calls raid6_intx2; 93extern const struct raid6_calls raid6_intx4; 94extern const struct raid6_calls raid6_intx8; 95extern const struct raid6_calls raid6_intx16; 96extern const struct raid6_calls raid6_intx32; 97extern const struct raid6_calls raid6_mmxx1; 98extern const struct raid6_calls raid6_mmxx2; 99extern const struct raid6_calls raid6_sse1x1; 100extern const struct raid6_calls raid6_sse1x2; 101extern const struct raid6_calls raid6_sse2x1; 102extern const struct raid6_calls raid6_sse2x2; 103extern const struct raid6_calls raid6_sse2x4; 104extern const struct raid6_calls raid6_altivec1; 105extern const struct raid6_calls raid6_altivec2; 106extern const struct raid6_calls raid6_altivec4; 107extern const struct raid6_calls raid6_altivec8; 108extern const struct raid6_calls raid6_avx2x1; 109extern const struct raid6_calls raid6_avx2x2; 110extern const struct raid6_calls raid6_avx2x4; 111extern const struct raid6_calls raid6_avx512x1; 112extern const struct raid6_calls raid6_avx512x2; 113extern const struct raid6_calls raid6_avx512x4; 114extern const struct raid6_calls raid6_s390vx8; 115extern const struct raid6_calls raid6_vpermxor1; 116extern const struct raid6_calls raid6_vpermxor2; 117extern const struct raid6_calls raid6_vpermxor4; 118extern const struct raid6_calls raid6_vpermxor8; 119 120struct raid6_recov_calls { 121 void (*data2)(int, size_t, int, int, void **); 122 void (*datap)(int, size_t, int, void **); 123 int (*valid)(void); 124 const char *name; 125 int priority; 126}; 127 128extern const struct raid6_recov_calls raid6_recov_intx1; 129extern const struct raid6_recov_calls raid6_recov_ssse3; 130extern const struct raid6_recov_calls raid6_recov_avx2; 131extern const struct raid6_recov_calls raid6_recov_avx512; 132extern const struct raid6_recov_calls raid6_recov_s390xc; 133extern const struct raid6_recov_calls raid6_recov_neon; 134 135extern const struct raid6_calls raid6_neonx1; 136extern const struct raid6_calls raid6_neonx2; 137extern const struct raid6_calls raid6_neonx4; 138extern const struct raid6_calls raid6_neonx8; 139 140/* Algorithm list */ 141extern const struct raid6_calls * const raid6_algos[]; 142extern const struct raid6_recov_calls *const raid6_recov_algos[]; 143int raid6_select_algo(void); 144 145/* Return values from chk_syndrome */ 146#define RAID6_OK 0 147#define RAID6_P_BAD 1 148#define RAID6_Q_BAD 2 149#define RAID6_PQ_BAD 3 150 151/* Galois field tables */ 152extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); 153extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256))); 154extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); 155extern const u8 raid6_gflog[256] __attribute__((aligned(256))); 156extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); 157extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); 158 159/* Recovery routines */ 160extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb, 161 void **ptrs); 162extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila, 163 void **ptrs); 164void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, 165 void **ptrs); 166 167/* Some definitions to allow code to be compiled for testing in userspace */ 168#ifndef __KERNEL__ 169 170# define jiffies raid6_jiffies() 171# define printk printf 172# define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__) 173# define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__) 174# define GFP_KERNEL 0 175# define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \ 176 PROT_READ|PROT_WRITE, \ 177 MAP_PRIVATE|MAP_ANONYMOUS,\ 178 0, 0)) 179# define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y)) 180 181static inline void cpu_relax(void) 182{ 183 /* Nothing */ 184} 185 186#undef HZ 187#define HZ 1000 188static inline uint32_t raid6_jiffies(void) 189{ 190 struct timeval tv; 191 gettimeofday(&tv, NULL); 192 return tv.tv_sec*1000 + tv.tv_usec/1000; 193} 194 195#endif /* ! __KERNEL__ */ 196 197#endif /* LINUX_RAID_RAID6_H */