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197 lines
6.0 KiB
197 lines
6.0 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* -*- linux-c -*- ------------------------------------------------------- * |
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* |
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* Copyright 2003 H. Peter Anvin - All Rights Reserved |
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* |
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* ----------------------------------------------------------------------- */ |
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#ifndef LINUX_RAID_RAID6_H |
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#define LINUX_RAID_RAID6_H |
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#ifdef __KERNEL__ |
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/* Set to 1 to use kernel-wide empty_zero_page */ |
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#define RAID6_USE_EMPTY_ZERO_PAGE 0 |
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#include <linux/blkdev.h> |
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/* We need a pre-zeroed page... if we don't want to use the kernel-provided |
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one define it here */ |
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#if RAID6_USE_EMPTY_ZERO_PAGE |
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# define raid6_empty_zero_page empty_zero_page |
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#else |
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extern const char raid6_empty_zero_page[PAGE_SIZE]; |
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#endif |
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#else /* ! __KERNEL__ */ |
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/* Used for testing in user space */ |
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#include <errno.h> |
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#include <inttypes.h> |
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#include <stddef.h> |
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#include <string.h> |
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#include <sys/mman.h> |
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#include <sys/time.h> |
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#include <sys/types.h> |
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/* Not standard, but glibc defines it */ |
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#define BITS_PER_LONG __WORDSIZE |
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typedef uint8_t u8; |
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typedef uint16_t u16; |
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typedef uint32_t u32; |
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typedef uint64_t u64; |
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#ifndef PAGE_SIZE |
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# define PAGE_SIZE 4096 |
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#endif |
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#ifndef PAGE_SHIFT |
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# define PAGE_SHIFT 12 |
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#endif |
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extern const char raid6_empty_zero_page[PAGE_SIZE]; |
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#define __init |
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#define __exit |
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#ifndef __attribute_const__ |
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# define __attribute_const__ __attribute__((const)) |
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#endif |
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#define noinline __attribute__((noinline)) |
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#define preempt_enable() |
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#define preempt_disable() |
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#define cpu_has_feature(x) 1 |
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#define enable_kernel_altivec() |
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#define disable_kernel_altivec() |
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#undef EXPORT_SYMBOL |
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#define EXPORT_SYMBOL(sym) |
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#undef EXPORT_SYMBOL_GPL |
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#define EXPORT_SYMBOL_GPL(sym) |
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#define MODULE_LICENSE(licence) |
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#define MODULE_DESCRIPTION(desc) |
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#define subsys_initcall(x) |
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#define module_exit(x) |
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#define IS_ENABLED(x) (x) |
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#define CONFIG_RAID6_PQ_BENCHMARK 1 |
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#endif /* __KERNEL__ */ |
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/* Routine choices */ |
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struct raid6_calls { |
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void (*gen_syndrome)(int, size_t, void **); |
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void (*xor_syndrome)(int, int, int, size_t, void **); |
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int (*valid)(void); /* Returns 1 if this routine set is usable */ |
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const char *name; /* Name of this routine set */ |
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int prefer; /* Has special performance attribute */ |
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}; |
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/* Selected algorithm */ |
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extern struct raid6_calls raid6_call; |
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/* Various routine sets */ |
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extern const struct raid6_calls raid6_intx1; |
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extern const struct raid6_calls raid6_intx2; |
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extern const struct raid6_calls raid6_intx4; |
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extern const struct raid6_calls raid6_intx8; |
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extern const struct raid6_calls raid6_intx16; |
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extern const struct raid6_calls raid6_intx32; |
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extern const struct raid6_calls raid6_mmxx1; |
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extern const struct raid6_calls raid6_mmxx2; |
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extern const struct raid6_calls raid6_sse1x1; |
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extern const struct raid6_calls raid6_sse1x2; |
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extern const struct raid6_calls raid6_sse2x1; |
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extern const struct raid6_calls raid6_sse2x2; |
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extern const struct raid6_calls raid6_sse2x4; |
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extern const struct raid6_calls raid6_altivec1; |
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extern const struct raid6_calls raid6_altivec2; |
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extern const struct raid6_calls raid6_altivec4; |
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extern const struct raid6_calls raid6_altivec8; |
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extern const struct raid6_calls raid6_avx2x1; |
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extern const struct raid6_calls raid6_avx2x2; |
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extern const struct raid6_calls raid6_avx2x4; |
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extern const struct raid6_calls raid6_avx512x1; |
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extern const struct raid6_calls raid6_avx512x2; |
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extern const struct raid6_calls raid6_avx512x4; |
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extern const struct raid6_calls raid6_s390vx8; |
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extern const struct raid6_calls raid6_vpermxor1; |
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extern const struct raid6_calls raid6_vpermxor2; |
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extern const struct raid6_calls raid6_vpermxor4; |
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extern const struct raid6_calls raid6_vpermxor8; |
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struct raid6_recov_calls { |
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void (*data2)(int, size_t, int, int, void **); |
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void (*datap)(int, size_t, int, void **); |
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int (*valid)(void); |
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const char *name; |
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int priority; |
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}; |
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extern const struct raid6_recov_calls raid6_recov_intx1; |
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extern const struct raid6_recov_calls raid6_recov_ssse3; |
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extern const struct raid6_recov_calls raid6_recov_avx2; |
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extern const struct raid6_recov_calls raid6_recov_avx512; |
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extern const struct raid6_recov_calls raid6_recov_s390xc; |
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extern const struct raid6_recov_calls raid6_recov_neon; |
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extern const struct raid6_calls raid6_neonx1; |
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extern const struct raid6_calls raid6_neonx2; |
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extern const struct raid6_calls raid6_neonx4; |
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extern const struct raid6_calls raid6_neonx8; |
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/* Algorithm list */ |
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extern const struct raid6_calls * const raid6_algos[]; |
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extern const struct raid6_recov_calls *const raid6_recov_algos[]; |
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int raid6_select_algo(void); |
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/* Return values from chk_syndrome */ |
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#define RAID6_OK 0 |
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#define RAID6_P_BAD 1 |
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#define RAID6_Q_BAD 2 |
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#define RAID6_PQ_BAD 3 |
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/* Galois field tables */ |
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extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); |
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extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256))); |
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extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); |
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extern const u8 raid6_gflog[256] __attribute__((aligned(256))); |
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extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); |
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extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); |
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/* Recovery routines */ |
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extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb, |
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void **ptrs); |
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extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila, |
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void **ptrs); |
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void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, |
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void **ptrs); |
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/* Some definitions to allow code to be compiled for testing in userspace */ |
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#ifndef __KERNEL__ |
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# define jiffies raid6_jiffies() |
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# define printk printf |
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# define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__) |
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# define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__) |
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# define GFP_KERNEL 0 |
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# define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \ |
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PROT_READ|PROT_WRITE, \ |
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MAP_PRIVATE|MAP_ANONYMOUS,\ |
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0, 0)) |
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# define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y)) |
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static inline void cpu_relax(void) |
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{ |
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/* Nothing */ |
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} |
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#undef HZ |
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#define HZ 1000 |
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static inline uint32_t raid6_jiffies(void) |
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{ |
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struct timeval tv; |
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gettimeofday(&tv, NULL); |
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return tv.tv_sec*1000 + tv.tv_usec/1000; |
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} |
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#endif /* ! __KERNEL__ */ |
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#endif /* LINUX_RAID_RAID6_H */
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