| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* -*- linux-c -*- ------------------------------------------------------- * |
| * |
| * Copyright 2003 H. Peter Anvin - All Rights Reserved |
| * |
| * ----------------------------------------------------------------------- */ |
| |
| #ifndef LINUX_RAID_RAID6_H |
| #define LINUX_RAID_RAID6_H |
| |
| #ifdef __KERNEL__ |
| |
| /* Set to 1 to use kernel-wide empty_zero_page */ |
| #define RAID6_USE_EMPTY_ZERO_PAGE 0 |
| #include <linux/blkdev.h> |
| |
| /* We need a pre-zeroed page... if we don't want to use the kernel-provided |
| one define it here */ |
| #if RAID6_USE_EMPTY_ZERO_PAGE |
| # define raid6_empty_zero_page empty_zero_page |
| #else |
| extern const char raid6_empty_zero_page[PAGE_SIZE]; |
| #endif |
| |
| #else /* ! __KERNEL__ */ |
| /* Used for testing in user space */ |
| |
| #include <errno.h> |
| #include <inttypes.h> |
| #include <limits.h> |
| #include <stddef.h> |
| #include <sys/mman.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| |
| /* Not standard, but glibc defines it */ |
| #define BITS_PER_LONG __WORDSIZE |
| |
| typedef uint8_t u8; |
| typedef uint16_t u16; |
| typedef uint32_t u32; |
| typedef uint64_t u64; |
| |
| #ifndef PAGE_SIZE |
| # define PAGE_SIZE 4096 |
| #endif |
| extern const char raid6_empty_zero_page[PAGE_SIZE]; |
| |
| #define __init |
| #define __exit |
| #ifndef __attribute_const__ |
| # define __attribute_const__ __attribute__((const)) |
| #endif |
| #define noinline __attribute__((noinline)) |
| |
| #define preempt_enable() |
| #define preempt_disable() |
| #define cpu_has_feature(x) 1 |
| #define enable_kernel_altivec() |
| #define disable_kernel_altivec() |
| |
| #define EXPORT_SYMBOL(sym) |
| #define EXPORT_SYMBOL_GPL(sym) |
| #define MODULE_LICENSE(licence) |
| #define MODULE_DESCRIPTION(desc) |
| #define subsys_initcall(x) |
| #define module_exit(x) |
| |
| #define IS_ENABLED(x) (x) |
| #define CONFIG_RAID6_PQ_BENCHMARK 1 |
| #endif /* __KERNEL__ */ |
| |
| /* Routine choices */ |
| struct raid6_calls { |
| void (*gen_syndrome)(int, size_t, void **); |
| void (*xor_syndrome)(int, int, int, size_t, void **); |
| int (*valid)(void); /* Returns 1 if this routine set is usable */ |
| const char *name; /* Name of this routine set */ |
| int prefer; /* Has special performance attribute */ |
| }; |
| |
| /* Selected algorithm */ |
| extern struct raid6_calls raid6_call; |
| |
| /* Various routine sets */ |
| extern const struct raid6_calls raid6_intx1; |
| extern const struct raid6_calls raid6_intx2; |
| extern const struct raid6_calls raid6_intx4; |
| extern const struct raid6_calls raid6_intx8; |
| extern const struct raid6_calls raid6_intx16; |
| extern const struct raid6_calls raid6_intx32; |
| extern const struct raid6_calls raid6_mmxx1; |
| extern const struct raid6_calls raid6_mmxx2; |
| extern const struct raid6_calls raid6_sse1x1; |
| extern const struct raid6_calls raid6_sse1x2; |
| extern const struct raid6_calls raid6_sse2x1; |
| extern const struct raid6_calls raid6_sse2x2; |
| extern const struct raid6_calls raid6_sse2x4; |
| extern const struct raid6_calls raid6_altivec1; |
| extern const struct raid6_calls raid6_altivec2; |
| extern const struct raid6_calls raid6_altivec4; |
| extern const struct raid6_calls raid6_altivec8; |
| extern const struct raid6_calls raid6_avx2x1; |
| extern const struct raid6_calls raid6_avx2x2; |
| extern const struct raid6_calls raid6_avx2x4; |
| extern const struct raid6_calls raid6_avx512x1; |
| extern const struct raid6_calls raid6_avx512x2; |
| extern const struct raid6_calls raid6_avx512x4; |
| extern const struct raid6_calls raid6_s390vx8; |
| extern const struct raid6_calls raid6_vpermxor1; |
| extern const struct raid6_calls raid6_vpermxor2; |
| extern const struct raid6_calls raid6_vpermxor4; |
| extern const struct raid6_calls raid6_vpermxor8; |
| |
| struct raid6_recov_calls { |
| void (*data2)(int, size_t, int, int, void **); |
| void (*datap)(int, size_t, int, void **); |
| int (*valid)(void); |
| const char *name; |
| int priority; |
| }; |
| |
| extern const struct raid6_recov_calls raid6_recov_intx1; |
| extern const struct raid6_recov_calls raid6_recov_ssse3; |
| extern const struct raid6_recov_calls raid6_recov_avx2; |
| extern const struct raid6_recov_calls raid6_recov_avx512; |
| extern const struct raid6_recov_calls raid6_recov_s390xc; |
| extern const struct raid6_recov_calls raid6_recov_neon; |
| |
| extern const struct raid6_calls raid6_neonx1; |
| extern const struct raid6_calls raid6_neonx2; |
| extern const struct raid6_calls raid6_neonx4; |
| extern const struct raid6_calls raid6_neonx8; |
| |
| /* Algorithm list */ |
| extern const struct raid6_calls * const raid6_algos[]; |
| extern const struct raid6_recov_calls *const raid6_recov_algos[]; |
| int raid6_select_algo(void); |
| |
| /* Return values from chk_syndrome */ |
| #define RAID6_OK 0 |
| #define RAID6_P_BAD 1 |
| #define RAID6_Q_BAD 2 |
| #define RAID6_PQ_BAD 3 |
| |
| /* Galois field tables */ |
| extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); |
| extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256))); |
| extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); |
| extern const u8 raid6_gflog[256] __attribute__((aligned(256))); |
| extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); |
| extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); |
| |
| /* Recovery routines */ |
| extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb, |
| void **ptrs); |
| extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila, |
| void **ptrs); |
| void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, |
| void **ptrs); |
| |
| /* Some definitions to allow code to be compiled for testing in userspace */ |
| #ifndef __KERNEL__ |
| |
| # define jiffies raid6_jiffies() |
| # define printk printf |
| # define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__) |
| # define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__) |
| # define GFP_KERNEL 0 |
| # define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \ |
| PROT_READ|PROT_WRITE, \ |
| MAP_PRIVATE|MAP_ANONYMOUS,\ |
| 0, 0)) |
| # define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y)) |
| |
| static inline void cpu_relax(void) |
| { |
| /* Nothing */ |
| } |
| |
| #undef HZ |
| #define HZ 1000 |
| static inline uint32_t raid6_jiffies(void) |
| { |
| struct timeval tv; |
| gettimeofday(&tv, NULL); |
| return tv.tv_sec*1000 + tv.tv_usec/1000; |
| } |
| |
| #endif /* ! __KERNEL__ */ |
| |
| #endif /* LINUX_RAID_RAID6_H */ |