1 /* -*- linux-c -*- ------------------------------------------------------- * 2 * 3 * Copyright 2003 H. Peter Anvin - All Rights Reserved 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation, Inc., 53 Temple Place Ste 330, 8 * Boston MA 02111-1307, USA; either version 2 of the License, or 9 * (at your option) any later version; incorporated herein by reference. 10 * 11 * ----------------------------------------------------------------------- */ 12 13 #ifndef LINUX_RAID_RAID6_H 14 #define LINUX_RAID_RAID6_H 15 16 #ifdef __KERNEL__ 17 18 /* Set to 1 to use kernel-wide empty_zero_page */ 19 #define RAID6_USE_EMPTY_ZERO_PAGE 0 20 #include <linux/blkdev.h> 21 22 /* We need a pre-zeroed page... if we don't want to use the kernel-provided 23 one define it here */ 24 #if RAID6_USE_EMPTY_ZERO_PAGE 25 # define raid6_empty_zero_page empty_zero_page 26 #else 27 extern const char raid6_empty_zero_page[PAGE_SIZE]; 28 #endif 29 30 #else /* ! __KERNEL__ */ 31 /* Used for testing in user space */ 32 33 #include <errno.h> 34 #include <inttypes.h> 35 #include <limits.h> 36 #include <stddef.h> 37 #include <sys/mman.h> 38 #include <sys/types.h> 39 40 /* Not standard, but glibc defines it */ 41 #define BITS_PER_LONG __WORDSIZE 42 43 typedef uint8_t u8; 44 typedef uint16_t u16; 45 typedef uint32_t u32; 46 typedef uint64_t u64; 47 48 #ifndef PAGE_SIZE 49 # define PAGE_SIZE 4096 50 #endif 51 extern const char raid6_empty_zero_page[PAGE_SIZE]; 52 53 #define __init 54 #define __exit 55 #define __attribute_const__ __attribute__((const)) 56 #define noinline __attribute__((noinline)) 57 58 #define preempt_enable() 59 #define preempt_disable() 60 #define cpu_has_feature(x) 1 61 #define enable_kernel_altivec() 62 #define disable_kernel_altivec() 63 64 #define EXPORT_SYMBOL(sym) 65 #define EXPORT_SYMBOL_GPL(sym) 66 #define MODULE_LICENSE(licence) 67 #define MODULE_DESCRIPTION(desc) 68 #define subsys_initcall(x) 69 #define module_exit(x) 70 #endif /* __KERNEL__ */ 71 72 /* Routine choices */ 73 struct raid6_calls { 74 void (*gen_syndrome)(int, size_t, void **); 75 void (*xor_syndrome)(int, int, int, size_t, void **); 76 int (*valid)(void); /* Returns 1 if this routine set is usable */ 77 const char *name; /* Name of this routine set */ 78 int prefer; /* Has special performance attribute */ 79 }; 80 81 /* Selected algorithm */ 82 extern struct raid6_calls raid6_call; 83 84 /* Various routine sets */ 85 extern const struct raid6_calls raid6_intx1; 86 extern const struct raid6_calls raid6_intx2; 87 extern const struct raid6_calls raid6_intx4; 88 extern const struct raid6_calls raid6_intx8; 89 extern const struct raid6_calls raid6_intx16; 90 extern const struct raid6_calls raid6_intx32; 91 extern const struct raid6_calls raid6_mmxx1; 92 extern const struct raid6_calls raid6_mmxx2; 93 extern const struct raid6_calls raid6_sse1x1; 94 extern const struct raid6_calls raid6_sse1x2; 95 extern const struct raid6_calls raid6_sse2x1; 96 extern const struct raid6_calls raid6_sse2x2; 97 extern const struct raid6_calls raid6_sse2x4; 98 extern const struct raid6_calls raid6_altivec1; 99 extern const struct raid6_calls raid6_altivec2; 100 extern const struct raid6_calls raid6_altivec4; 101 extern const struct raid6_calls raid6_altivec8; 102 extern const struct raid6_calls raid6_avx2x1; 103 extern const struct raid6_calls raid6_avx2x2; 104 extern const struct raid6_calls raid6_avx2x4; 105 extern const struct raid6_calls raid6_avx512x1; 106 extern const struct raid6_calls raid6_avx512x2; 107 extern const struct raid6_calls raid6_avx512x4; 108 extern const struct raid6_calls raid6_s390vx8; 109 extern const struct raid6_calls raid6_vpermxor1; 110 extern const struct raid6_calls raid6_vpermxor2; 111 extern const struct raid6_calls raid6_vpermxor4; 112 extern const struct raid6_calls raid6_vpermxor8; 113 114 struct raid6_recov_calls { 115 void (*data2)(int, size_t, int, int, void **); 116 void (*datap)(int, size_t, int, void **); 117 int (*valid)(void); 118 const char *name; 119 int priority; 120 }; 121 122 extern const struct raid6_recov_calls raid6_recov_intx1; 123 extern const struct raid6_recov_calls raid6_recov_ssse3; 124 extern const struct raid6_recov_calls raid6_recov_avx2; 125 extern const struct raid6_recov_calls raid6_recov_avx512; 126 extern const struct raid6_recov_calls raid6_recov_s390xc; 127 extern const struct raid6_recov_calls raid6_recov_neon; 128 129 extern const struct raid6_calls raid6_neonx1; 130 extern const struct raid6_calls raid6_neonx2; 131 extern const struct raid6_calls raid6_neonx4; 132 extern const struct raid6_calls raid6_neonx8; 133 134 /* Algorithm list */ 135 extern const struct raid6_calls * const raid6_algos[]; 136 extern const struct raid6_recov_calls *const raid6_recov_algos[]; 137 int 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 */ 146 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); 147 extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256))); 148 extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); 149 extern const u8 raid6_gflog[256] __attribute__((aligned(256))); 150 extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); 151 extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); 152 153 /* Recovery routines */ 154 extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb, 155 void **ptrs); 156 extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila, 157 void **ptrs); 158 void 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)) 174 175 static inline void cpu_relax(void) 176 { 177 /* Nothing */ 178 } 179 180 #undef HZ 181 #define HZ 1000 182 static 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