include/linux/raid/pq.h

   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_tilegx8;
 109 extern const struct raid6_calls raid6_s390vx8;
 110
 111 struct raid6_recov_calls {
 112         void (*data2)(int, size_t, int, int, void **);
 113         void (*datap)(int, size_t, int, void **);
 114         int  (*valid)(void);
 115         const char *name;
 116         int priority;
 117 };
 118
 119 extern const struct raid6_recov_calls raid6_recov_intx1;
 120 extern const struct raid6_recov_calls raid6_recov_ssse3;
 121 extern const struct raid6_recov_calls raid6_recov_avx2;
 122 extern const struct raid6_recov_calls raid6_recov_avx512;
 123 extern const struct raid6_recov_calls raid6_recov_s390xc;
 124
 125 extern const struct raid6_calls raid6_neonx1;
 126 extern const struct raid6_calls raid6_neonx2;
 127 extern const struct raid6_calls raid6_neonx4;
 128 extern const struct raid6_calls raid6_neonx8;
 129
 130 /* Algorithm list */
 131 extern const struct raid6_calls * const raid6_algos[];
 132 extern const struct raid6_recov_calls *const raid6_recov_algos[];
 133 int raid6_select_algo(void);
 134
 135 /* Return values from chk_syndrome */
 136 #define RAID6_OK        0
 137 #define RAID6_P_BAD     1
 138 #define RAID6_Q_BAD     2
 139 #define RAID6_PQ_BAD    3
 140
 141 /* Galois field tables */
 142 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
 143 extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256)));
 144 extern const u8 raid6_gfexp[256]      __attribute__((aligned(256)));
 145 extern const u8 raid6_gfinv[256]      __attribute__((aligned(256)));
 146 extern const u8 raid6_gfexi[256]      __attribute__((aligned(256)));
 147
 148 /* Recovery routines */
 149 extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb,
 150                        void **ptrs);
 151 extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila,
 152                         void **ptrs);
 153 void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
 154                       void **ptrs);
 155
 156 /* Some definitions to allow code to be compiled for testing in userspace */
 157 #ifndef __KERNEL__
 158
 159 # define jiffies        raid6_jiffies()
 160 # define printk         printf
 161 # define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
 162 # define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__)
 163 # define GFP_KERNEL     0
 164 # define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \
 165                                                      PROT_READ|PROT_WRITE,   \
 166                                                      MAP_PRIVATE|MAP_ANONYMOUS,\
 167                                                      0, 0))
 168 # define free_pages(x, y)       munmap((void *)(x), PAGE_SIZE << (y))
 169
 170 static inline void cpu_relax(void)
 171 {
 172         /* Nothing */
 173 }
 174
 175 #undef  HZ
 176 #define HZ 1000
 177 static inline uint32_t raid6_jiffies(void)
 178 {
 179         struct timeval tv;
 180         gettimeofday(&tv, NULL);
 181         return tv.tv_sec*1000 + tv.tv_usec/1000;
 182 }
 183
 184 #endif /* ! __KERNEL__ */
 185
 186 #endif /* LINUX_RAID_RAID6_H */