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 /* Algorithm list */ 103 extern const struct raid6_calls * const raid6_algos[]; 104 int raid6_select_algo(void); 105 106 /* Return values from chk_syndrome */ 107 #define RAID6_OK 0 108 #define RAID6_P_BAD 1 109 #define RAID6_Q_BAD 2 110 #define RAID6_PQ_BAD 3 111 112 /* Galois field tables */ 113 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); 114 extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); 115 extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); 116 extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); 117 118 /* Recovery routines */ 119 void raid6_2data_recov(int disks, size_t bytes, int faila, int failb, 120 void **ptrs); 121 void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs); 122 void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, 123 void **ptrs); 124 125 /* Some definitions to allow code to be compiled for testing in userspace */ 126 #ifndef __KERNEL__ 127 128 # define jiffies raid6_jiffies() 129 # define printk printf 130 # define GFP_KERNEL 0 131 # define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \ 132 PROT_READ|PROT_WRITE, \ 133 MAP_PRIVATE|MAP_ANONYMOUS,\ 134 0, 0)) 135 # define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y)) 136 137 static inline void cpu_relax(void) 138 { 139 /* Nothing */ 140 } 141 142 #undef HZ 143 #define HZ 1000 144 static inline uint32_t raid6_jiffies(void) 145 { 146 struct timeval tv; 147 gettimeofday(&tv, NULL); 148 return tv.tv_sec*1000 + tv.tv_usec/1000; 149 } 150 151 #endif /* ! __KERNEL__ */ 152 153 #endif /* LINUX_RAID_RAID6_H */ 154