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 22 extern 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 39 typedef uint8_t u8; 40 typedef uint16_t u16; 41 typedef uint32_t u32; 42 typedef 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 50 extern 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 */ 79 struct 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 prefer; /* Has special performance attribute */ 85 }; 86 87 /* Selected algorithm */ 88 extern struct raid6_calls raid6_call; 89 90 /* Various routine sets */ 91 extern const struct raid6_calls raid6_intx1; 92 extern const struct raid6_calls raid6_intx2; 93 extern const struct raid6_calls raid6_intx4; 94 extern const struct raid6_calls raid6_intx8; 95 extern const struct raid6_calls raid6_intx16; 96 extern const struct raid6_calls raid6_intx32; 97 extern const struct raid6_calls raid6_mmxx1; 98 extern const struct raid6_calls raid6_mmxx2; 99 extern const struct raid6_calls raid6_sse1x1; 100 extern const struct raid6_calls raid6_sse1x2; 101 extern const struct raid6_calls raid6_sse2x1; 102 extern const struct raid6_calls raid6_sse2x2; 103 extern const struct raid6_calls raid6_sse2x4; 104 extern const struct raid6_calls raid6_altivec1; 105 extern const struct raid6_calls raid6_altivec2; 106 extern const struct raid6_calls raid6_altivec4; 107 extern const struct raid6_calls raid6_altivec8; 108 extern const struct raid6_calls raid6_avx2x1; 109 extern const struct raid6_calls raid6_avx2x2; 110 extern const struct raid6_calls raid6_avx2x4; 111 extern const struct raid6_calls raid6_avx512x1; 112 extern const struct raid6_calls raid6_avx512x2; 113 extern const struct raid6_calls raid6_avx512x4; 114 extern const struct raid6_calls raid6_s390vx8; 115 extern const struct raid6_calls raid6_vpermxor1; 116 extern const struct raid6_calls raid6_vpermxor2; 117 extern const struct raid6_calls raid6_vpermxor4; 118 extern const struct raid6_calls raid6_vpermxor8; 119 120 struct 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 }; 127 128 extern const struct raid6_recov_calls raid6_recov_intx1; 129 extern const struct raid6_recov_calls raid6_recov_ssse3; 130 extern const struct raid6_recov_calls raid6_recov_avx2; 131 extern const struct raid6_recov_calls raid6_recov_avx512; 132 extern const struct raid6_recov_calls raid6_recov_s390xc; 133 extern const struct raid6_recov_calls raid6_recov_neon; 134 135 extern const struct raid6_calls raid6_neonx1; 136 extern const struct raid6_calls raid6_neonx2; 137 extern const struct raid6_calls raid6_neonx4; 138 extern const struct raid6_calls raid6_neonx8; 139 140 /* Algorithm list */ 141 extern const struct raid6_calls * const raid6_algos[]; 142 extern const struct raid6_recov_calls *const raid6_recov_algos[]; 143 int 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 */ 152 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); 153 extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256))); 154 extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); 155 extern const u8 raid6_gflog[256] __attribute__((aligned(256))); 156 extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); 157 extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); 158 159 /* Recovery routines */ 160 extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb, 161 void **ptrs); 162 extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila, 163 void **ptrs); 164 void 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)) 180 181 static inline void cpu_relax(void) 182 { 183 /* Nothing */ 184 } 185 186 #undef HZ 187 #define HZ 1000 188 static 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 */ 198