Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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/* 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 */