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#include <linux/blkdev.h> 14 15extern const char raid6_empty_zero_page[PAGE_SIZE]; 16 17#else /* ! __KERNEL__ */ 18/* Used for testing in user space */ 19 20#include <errno.h> 21#include <inttypes.h> 22#include <stddef.h> 23#include <string.h> 24#include <sys/mman.h> 25#include <sys/time.h> 26#include <sys/types.h> 27 28/* Not standard, but glibc defines it */ 29#define BITS_PER_LONG __WORDSIZE 30 31typedef uint8_t u8; 32typedef uint16_t u16; 33typedef uint32_t u32; 34typedef uint64_t u64; 35 36#ifndef PAGE_SIZE 37# define PAGE_SIZE 4096 38#endif 39#ifndef PAGE_SHIFT 40# define PAGE_SHIFT 12 41#endif 42extern const char raid6_empty_zero_page[PAGE_SIZE]; 43 44#define __init 45#define __exit 46#ifndef __attribute_const__ 47# define __attribute_const__ __attribute__((const)) 48#endif 49#define noinline __attribute__((noinline)) 50 51#define preempt_enable() 52#define preempt_disable() 53#define cpu_has_feature(x) 1 54#define enable_kernel_altivec() 55#define disable_kernel_altivec() 56 57#undef EXPORT_SYMBOL 58#define EXPORT_SYMBOL(sym) 59#undef EXPORT_SYMBOL_GPL 60#define EXPORT_SYMBOL_GPL(sym) 61#define MODULE_LICENSE(licence) 62#define MODULE_DESCRIPTION(desc) 63#define subsys_initcall(x) 64#define module_exit(x) 65 66#define IS_ENABLED(x) (x) 67#define CONFIG_RAID6_PQ_BENCHMARK 1 68#endif /* __KERNEL__ */ 69 70/* Routine choices */ 71struct raid6_calls { 72 void (*gen_syndrome)(int, size_t, void **); 73 void (*xor_syndrome)(int, int, int, size_t, void **); 74 int (*valid)(void); /* Returns 1 if this routine set is usable */ 75 const char *name; /* Name of this routine set */ 76 int priority; /* Relative priority ranking if non-zero */ 77}; 78 79/* Selected algorithm */ 80extern struct raid6_calls raid6_call; 81 82/* Various routine sets */ 83extern const struct raid6_calls raid6_intx1; 84extern const struct raid6_calls raid6_intx2; 85extern const struct raid6_calls raid6_intx4; 86extern const struct raid6_calls raid6_intx8; 87extern const struct raid6_calls raid6_mmxx1; 88extern const struct raid6_calls raid6_mmxx2; 89extern const struct raid6_calls raid6_sse1x1; 90extern const struct raid6_calls raid6_sse1x2; 91extern const struct raid6_calls raid6_sse2x1; 92extern const struct raid6_calls raid6_sse2x2; 93extern const struct raid6_calls raid6_sse2x4; 94extern const struct raid6_calls raid6_altivec1; 95extern const struct raid6_calls raid6_altivec2; 96extern const struct raid6_calls raid6_altivec4; 97extern const struct raid6_calls raid6_altivec8; 98extern const struct raid6_calls raid6_avx2x1; 99extern const struct raid6_calls raid6_avx2x2; 100extern const struct raid6_calls raid6_avx2x4; 101extern const struct raid6_calls raid6_avx512x1; 102extern const struct raid6_calls raid6_avx512x2; 103extern const struct raid6_calls raid6_avx512x4; 104extern const struct raid6_calls raid6_s390vx8; 105extern const struct raid6_calls raid6_vpermxor1; 106extern const struct raid6_calls raid6_vpermxor2; 107extern const struct raid6_calls raid6_vpermxor4; 108extern const struct raid6_calls raid6_vpermxor8; 109extern const struct raid6_calls raid6_lsx; 110extern const struct raid6_calls raid6_lasx; 111 112struct raid6_recov_calls { 113 void (*data2)(int, size_t, int, int, void **); 114 void (*datap)(int, size_t, int, void **); 115 int (*valid)(void); 116 const char *name; 117 int priority; 118}; 119 120extern const struct raid6_recov_calls raid6_recov_intx1; 121extern const struct raid6_recov_calls raid6_recov_ssse3; 122extern const struct raid6_recov_calls raid6_recov_avx2; 123extern const struct raid6_recov_calls raid6_recov_avx512; 124extern const struct raid6_recov_calls raid6_recov_s390xc; 125extern const struct raid6_recov_calls raid6_recov_neon; 126extern const struct raid6_recov_calls raid6_recov_lsx; 127extern const struct raid6_recov_calls raid6_recov_lasx; 128 129extern const struct raid6_calls raid6_neonx1; 130extern const struct raid6_calls raid6_neonx2; 131extern const struct raid6_calls raid6_neonx4; 132extern const struct raid6_calls raid6_neonx8; 133 134/* Algorithm list */ 135extern const struct raid6_calls * const raid6_algos[]; 136extern const struct raid6_recov_calls *const raid6_recov_algos[]; 137int raid6_select_algo(void); 138 139/* Return values from chk_syndrome */ 140#define RAID6_OK 0 141#define RAID6_P_BAD 1 142#define RAID6_Q_BAD 2 143#define RAID6_PQ_BAD 3 144 145/* Galois field tables */ 146extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); 147extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256))); 148extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); 149extern const u8 raid6_gflog[256] __attribute__((aligned(256))); 150extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); 151extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); 152 153/* Recovery routines */ 154extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb, 155 void **ptrs); 156extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila, 157 void **ptrs); 158void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, 159 void **ptrs); 160 161/* Some definitions to allow code to be compiled for testing in userspace */ 162#ifndef __KERNEL__ 163 164# define jiffies raid6_jiffies() 165# define printk printf 166# define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__) 167# define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__) 168# define GFP_KERNEL 0 169# define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \ 170 PROT_READ|PROT_WRITE, \ 171 MAP_PRIVATE|MAP_ANONYMOUS,\ 172 0, 0)) 173# define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y)) 174 175static inline void cpu_relax(void) 176{ 177 /* Nothing */ 178} 179 180#undef HZ 181#define HZ 1000 182static inline uint32_t raid6_jiffies(void) 183{ 184 struct timeval tv; 185 gettimeofday(&tv, NULL); 186 return tv.tv_sec*1000 + tv.tv_usec/1000; 187} 188 189#endif /* ! __KERNEL__ */ 190 191#endif /* LINUX_RAID_RAID6_H */ 192