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