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_tilegx8; 106 107 struct raid6_recov_calls { 108 void (*data2)(int, size_t, int, int, void **); 109 void (*datap)(int, size_t, int, void **); 110 int (*valid)(void); 111 const char *name; 112 int priority; 113 }; 114 115 extern const struct raid6_recov_calls raid6_recov_intx1; 116 extern const struct raid6_recov_calls raid6_recov_ssse3; 117 extern const struct raid6_recov_calls raid6_recov_avx2; 118 119 extern const struct raid6_calls raid6_neonx1; 120 extern const struct raid6_calls raid6_neonx2; 121 extern const struct raid6_calls raid6_neonx4; 122 extern const struct raid6_calls raid6_neonx8; 123 124 /* Algorithm list */ 125 extern const struct raid6_calls * const raid6_algos[]; 126 extern const struct raid6_recov_calls *const raid6_recov_algos[]; 127 int raid6_select_algo(void); 128 129 /* Return values from chk_syndrome */ 130 #define RAID6_OK 0 131 #define RAID6_P_BAD 1 132 #define RAID6_Q_BAD 2 133 #define RAID6_PQ_BAD 3 134 135 /* Galois field tables */ 136 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); 137 extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256))); 138 extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); 139 extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); 140 extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); 141 142 /* Recovery routines */ 143 extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb, 144 void **ptrs); 145 extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila, 146 void **ptrs); 147 void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, 148 void **ptrs); 149 150 /* Some definitions to allow code to be compiled for testing in userspace */ 151 #ifndef __KERNEL__ 152 153 # define jiffies raid6_jiffies() 154 # define printk printf 155 # define GFP_KERNEL 0 156 # define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \ 157 PROT_READ|PROT_WRITE, \ 158 MAP_PRIVATE|MAP_ANONYMOUS,\ 159 0, 0)) 160 # define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y)) 161 162 static inline void cpu_relax(void) 163 { 164 /* Nothing */ 165 } 166 167 #undef HZ 168 #define HZ 1000 169 static inline uint32_t raid6_jiffies(void) 170 { 171 struct timeval tv; 172 gettimeofday(&tv, NULL); 173 return tv.tv_sec*1000 + tv.tv_usec/1000; 174 } 175 176 #endif /* ! __KERNEL__ */ 177 178 #endif /* LINUX_RAID_RAID6_H */ 179