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 int (*valid)(void); /* Returns 1 if this routine set is usable */ 76 const char *name; /* Name of this routine set */ 77 int prefer; /* Has special performance attribute */ 78 }; 79 80 /* Selected algorithm */ 81 extern struct raid6_calls raid6_call; 82 83 /* Various routine sets */ 84 extern const struct raid6_calls raid6_intx1; 85 extern const struct raid6_calls raid6_intx2; 86 extern const struct raid6_calls raid6_intx4; 87 extern const struct raid6_calls raid6_intx8; 88 extern const struct raid6_calls raid6_intx16; 89 extern const struct raid6_calls raid6_intx32; 90 extern const struct raid6_calls raid6_mmxx1; 91 extern const struct raid6_calls raid6_mmxx2; 92 extern const struct raid6_calls raid6_sse1x1; 93 extern const struct raid6_calls raid6_sse1x2; 94 extern const struct raid6_calls raid6_sse2x1; 95 extern const struct raid6_calls raid6_sse2x2; 96 extern const struct raid6_calls raid6_sse2x4; 97 extern const struct raid6_calls raid6_altivec1; 98 extern const struct raid6_calls raid6_altivec2; 99 extern const struct raid6_calls raid6_altivec4; 100 extern const struct raid6_calls raid6_altivec8; 101 102 struct raid6_recov_calls { 103 void (*data2)(int, size_t, int, int, void **); 104 void (*datap)(int, size_t, int, void **); 105 int (*valid)(void); 106 const char *name; 107 int priority; 108 }; 109 110 extern const struct raid6_recov_calls raid6_recov_intx1; 111 extern const struct raid6_recov_calls raid6_recov_ssse3; 112 113 /* Algorithm list */ 114 extern const struct raid6_calls * const raid6_algos[]; 115 extern const struct raid6_recov_calls *const raid6_recov_algos[]; 116 int raid6_select_algo(void); 117 118 /* Return values from chk_syndrome */ 119 #define RAID6_OK 0 120 #define RAID6_P_BAD 1 121 #define RAID6_Q_BAD 2 122 #define RAID6_PQ_BAD 3 123 124 /* Galois field tables */ 125 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); 126 extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256))); 127 extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); 128 extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); 129 extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); 130 131 /* Recovery routines */ 132 extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb, 133 void **ptrs); 134 extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila, 135 void **ptrs); 136 void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, 137 void **ptrs); 138 139 /* Some definitions to allow code to be compiled for testing in userspace */ 140 #ifndef __KERNEL__ 141 142 # define jiffies raid6_jiffies() 143 # define printk printf 144 # define GFP_KERNEL 0 145 # define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \ 146 PROT_READ|PROT_WRITE, \ 147 MAP_PRIVATE|MAP_ANONYMOUS,\ 148 0, 0)) 149 # define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y)) 150 151 static inline void cpu_relax(void) 152 { 153 /* Nothing */ 154 } 155 156 #undef HZ 157 #define HZ 1000 158 static inline uint32_t raid6_jiffies(void) 159 { 160 struct timeval tv; 161 gettimeofday(&tv, NULL); 162 return tv.tv_sec*1000 + tv.tv_usec/1000; 163 } 164 165 #endif /* ! __KERNEL__ */ 166 167 #endif /* LINUX_RAID_RAID6_H */ 168