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 * Bostom 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 21#include <linux/module.h> 22#include <linux/stddef.h> 23#include <linux/compiler.h> 24#include <linux/types.h> 25#include <linux/kernel.h> 26#include <linux/errno.h> 27#include <linux/mempool.h> 28#include <linux/list.h> 29#include <linux/vmalloc.h> 30#include <linux/raid/md.h> 31#include <linux/raid/raid5.h> 32 33typedef raid5_conf_t raid6_conf_t; /* Same configuration */ 34 35/* Additional compute_parity mode -- updates the parity w/o LOCKING */ 36#define UPDATE_PARITY 4 37 38/* We need a pre-zeroed page... if we don't want to use the kernel-provided 39 one define it here */ 40#if RAID6_USE_EMPTY_ZERO_PAGE 41# define raid6_empty_zero_page empty_zero_page 42#else 43extern const char raid6_empty_zero_page[PAGE_SIZE]; 44#endif 45 46#else /* ! __KERNEL__ */ 47/* Used for testing in user space */ 48 49#include <errno.h> 50#include <inttypes.h> 51#include <limits.h> 52#include <stddef.h> 53#include <sys/mman.h> 54#include <sys/types.h> 55 56/* Not standard, but glibc defines it */ 57#define BITS_PER_LONG __WORDSIZE 58 59typedef uint8_t u8; 60typedef uint16_t u16; 61typedef uint32_t u32; 62typedef uint64_t u64; 63 64#ifndef PAGE_SIZE 65# define PAGE_SIZE 4096 66#endif 67extern const char raid6_empty_zero_page[PAGE_SIZE]; 68 69#define __init 70#define __exit 71#define __attribute_const__ __attribute__((const)) 72#define noinline __attribute__((noinline)) 73 74#define preempt_enable() 75#define preempt_disable() 76#define cpu_has_feature(x) 1 77#define enable_kernel_altivec() 78#define disable_kernel_altivec() 79 80#endif /* __KERNEL__ */ 81 82/* Routine choices */ 83struct raid6_calls { 84 void (*gen_syndrome)(int, size_t, void **); 85 int (*valid)(void); /* Returns 1 if this routine set is usable */ 86 const char *name; /* Name of this routine set */ 87 int prefer; /* Has special performance attribute */ 88}; 89 90/* Selected algorithm */ 91extern struct raid6_calls raid6_call; 92 93/* Algorithm list */ 94extern const struct raid6_calls * const raid6_algos[]; 95int raid6_select_algo(void); 96 97/* Return values from chk_syndrome */ 98#define RAID6_OK 0 99#define RAID6_P_BAD 1 100#define RAID6_Q_BAD 2 101#define RAID6_PQ_BAD 3 102 103/* Galois field tables */ 104extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); 105extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); 106extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); 107extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); 108 109/* Recovery routines */ 110void raid6_2data_recov(int disks, size_t bytes, int faila, int failb, void **ptrs); 111void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs); 112void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, void **ptrs); 113 114/* Some definitions to allow code to be compiled for testing in userspace */ 115#ifndef __KERNEL__ 116 117# define jiffies raid6_jiffies() 118# define printk printf 119# define GFP_KERNEL 0 120# define __get_free_pages(x,y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0)) 121# define free_pages(x,y) munmap((void *)(x), (y)*PAGE_SIZE) 122 123static inline void cpu_relax(void) 124{ 125 /* Nothing */ 126} 127 128#undef HZ 129#define HZ 1000 130static inline uint32_t raid6_jiffies(void) 131{ 132 struct timeval tv; 133 gettimeofday(&tv, NULL); 134 return tv.tv_sec*1000 + tv.tv_usec/1000; 135} 136 137#endif /* ! __KERNEL__ */ 138 139#endif /* LINUX_RAID_RAID6_H */ 140