linux/include/linux/raid/pq.h
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   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/* -*- linux-c -*- ------------------------------------------------------- *
   3 *
   4 *   Copyright 2003 H. Peter Anvin - All Rights Reserved
   5 *
   6 * ----------------------------------------------------------------------- */
   7
   8#ifndef LINUX_RAID_RAID6_H
   9#define LINUX_RAID_RAID6_H
  10
  11#ifdef __KERNEL__
  12
  13/* Set to 1 to use kernel-wide empty_zero_page */
  14#define RAID6_USE_EMPTY_ZERO_PAGE 0
  15#include <linux/blkdev.h>
  16
  17/* We need a pre-zeroed page... if we don't want to use the kernel-provided
  18   one define it here */
  19#if RAID6_USE_EMPTY_ZERO_PAGE
  20# define raid6_empty_zero_page empty_zero_page
  21#else
  22extern const char raid6_empty_zero_page[PAGE_SIZE];
  23#endif
  24
  25#else /* ! __KERNEL__ */
  26/* Used for testing in user space */
  27
  28#include <errno.h>
  29#include <inttypes.h>
  30#include <limits.h>
  31#include <stddef.h>
  32#include <sys/mman.h>
  33#include <sys/time.h>
  34#include <sys/types.h>
  35
  36/* Not standard, but glibc defines it */
  37#define BITS_PER_LONG __WORDSIZE
  38
  39typedef uint8_t  u8;
  40typedef uint16_t u16;
  41typedef uint32_t u32;
  42typedef uint64_t u64;
  43
  44#ifndef PAGE_SIZE
  45# define PAGE_SIZE 4096
  46#endif
  47extern const char raid6_empty_zero_page[PAGE_SIZE];
  48
  49#define __init
  50#define __exit
  51#ifndef __attribute_const__
  52# define __attribute_const__ __attribute__((const))
  53#endif
  54#define noinline __attribute__((noinline))
  55
  56#define preempt_enable()
  57#define preempt_disable()
  58#define cpu_has_feature(x) 1
  59#define enable_kernel_altivec()
  60#define disable_kernel_altivec()
  61
  62#define EXPORT_SYMBOL(sym)
  63#define EXPORT_SYMBOL_GPL(sym)
  64#define MODULE_LICENSE(licence)
  65#define MODULE_DESCRIPTION(desc)
  66#define subsys_initcall(x)
  67#define module_exit(x)
  68
  69#define IS_ENABLED(x) (x)
  70#define CONFIG_RAID6_PQ_BENCHMARK 1
  71#endif /* __KERNEL__ */
  72
  73/* Routine choices */
  74struct raid6_calls {
  75        void (*gen_syndrome)(int, size_t, void **);
  76        void (*xor_syndrome)(int, int, int, size_t, void **);
  77        int  (*valid)(void);    /* Returns 1 if this routine set is usable */
  78        const char *name;       /* Name of this routine set */
  79        int prefer;             /* Has special performance attribute */
  80};
  81
  82/* Selected algorithm */
  83extern struct raid6_calls raid6_call;
  84
  85/* Various routine sets */
  86extern const struct raid6_calls raid6_intx1;
  87extern const struct raid6_calls raid6_intx2;
  88extern const struct raid6_calls raid6_intx4;
  89extern const struct raid6_calls raid6_intx8;
  90extern const struct raid6_calls raid6_intx16;
  91extern const struct raid6_calls raid6_intx32;
  92extern const struct raid6_calls raid6_mmxx1;
  93extern const struct raid6_calls raid6_mmxx2;
  94extern const struct raid6_calls raid6_sse1x1;
  95extern const struct raid6_calls raid6_sse1x2;
  96extern const struct raid6_calls raid6_sse2x1;
  97extern const struct raid6_calls raid6_sse2x2;
  98extern const struct raid6_calls raid6_sse2x4;
  99extern const struct raid6_calls raid6_altivec1;
 100extern const struct raid6_calls raid6_altivec2;
 101extern const struct raid6_calls raid6_altivec4;
 102extern const struct raid6_calls raid6_altivec8;
 103extern const struct raid6_calls raid6_avx2x1;
 104extern const struct raid6_calls raid6_avx2x2;
 105extern const struct raid6_calls raid6_avx2x4;
 106extern const struct raid6_calls raid6_avx512x1;
 107extern const struct raid6_calls raid6_avx512x2;
 108extern const struct raid6_calls raid6_avx512x4;
 109extern const struct raid6_calls raid6_s390vx8;
 110extern const struct raid6_calls raid6_vpermxor1;
 111extern const struct raid6_calls raid6_vpermxor2;
 112extern const struct raid6_calls raid6_vpermxor4;
 113extern const struct raid6_calls raid6_vpermxor8;
 114
 115struct raid6_recov_calls {
 116        void (*data2)(int, size_t, int, int, void **);
 117        void (*datap)(int, size_t, int, void **);
 118        int  (*valid)(void);
 119        const char *name;
 120        int priority;
 121};
 122
 123extern const struct raid6_recov_calls raid6_recov_intx1;
 124extern const struct raid6_recov_calls raid6_recov_ssse3;
 125extern const struct raid6_recov_calls raid6_recov_avx2;
 126extern const struct raid6_recov_calls raid6_recov_avx512;
 127extern const struct raid6_recov_calls raid6_recov_s390xc;
 128extern const struct raid6_recov_calls raid6_recov_neon;
 129
 130extern const struct raid6_calls raid6_neonx1;
 131extern const struct raid6_calls raid6_neonx2;
 132extern const struct raid6_calls raid6_neonx4;
 133extern const struct raid6_calls raid6_neonx8;
 134
 135/* Algorithm list */
 136extern const struct raid6_calls * const raid6_algos[];
 137extern const struct raid6_recov_calls *const raid6_recov_algos[];
 138int raid6_select_algo(void);
 139
 140/* Return values from chk_syndrome */
 141#define RAID6_OK        0
 142#define RAID6_P_BAD     1
 143#define RAID6_Q_BAD     2
 144#define RAID6_PQ_BAD    3
 145
 146/* Galois field tables */
 147extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
 148extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256)));
 149extern const u8 raid6_gfexp[256]      __attribute__((aligned(256)));
 150extern const u8 raid6_gflog[256]      __attribute__((aligned(256)));
 151extern const u8 raid6_gfinv[256]      __attribute__((aligned(256)));
 152extern const u8 raid6_gfexi[256]      __attribute__((aligned(256)));
 153
 154/* Recovery routines */
 155extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb,
 156                       void **ptrs);
 157extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila,
 158                        void **ptrs);
 159void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
 160                      void **ptrs);
 161
 162/* Some definitions to allow code to be compiled for testing in userspace */
 163#ifndef __KERNEL__
 164
 165# define jiffies        raid6_jiffies()
 166# define printk         printf
 167# define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
 168# define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__)
 169# define GFP_KERNEL     0
 170# define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \
 171                                                     PROT_READ|PROT_WRITE,   \
 172                                                     MAP_PRIVATE|MAP_ANONYMOUS,\
 173                                                     0, 0))
 174# define free_pages(x, y)       munmap((void *)(x), PAGE_SIZE << (y))
 175
 176static inline void cpu_relax(void)
 177{
 178        /* Nothing */
 179}
 180
 181#undef  HZ
 182#define HZ 1000
 183static inline uint32_t raid6_jiffies(void)
 184{
 185        struct timeval tv;
 186        gettimeofday(&tv, NULL);
 187        return tv.tv_sec*1000 + tv.tv_usec/1000;
 188}
 189
 190#endif /* ! __KERNEL__ */
 191
 192#endif /* LINUX_RAID_RAID6_H */
 193