Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* -*- linux-c -*- ------------------------------------------------------- *
2 *
3 * Copyright 2003 H. Peter Anvin - All Rights Reserved
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, Inc., 53 Temple Place Ste 330,
8 * Boston MA 02111-1307, USA; either version 2 of the License, or
9 * (at your option) any later version; incorporated herein by reference.
10 *
11 * ----------------------------------------------------------------------- */
12
13#ifndef LINUX_RAID_RAID6_H
14#define LINUX_RAID_RAID6_H
15
16#ifdef __KERNEL__
17
18/* Set to 1 to use kernel-wide empty_zero_page */
19#define RAID6_USE_EMPTY_ZERO_PAGE 0
20#include <linux/blkdev.h>
21
22/* We need a pre-zeroed page... if we don't want to use the kernel-provided
23 one define it here */
24#if RAID6_USE_EMPTY_ZERO_PAGE
25# define raid6_empty_zero_page empty_zero_page
26#else
27extern const char raid6_empty_zero_page[PAGE_SIZE];
28#endif
29
30#else /* ! __KERNEL__ */
31/* Used for testing in user space */
32
33#include <errno.h>
34#include <inttypes.h>
35#include <limits.h>
36#include <stddef.h>
37#include <sys/mman.h>
38#include <sys/time.h>
39#include <sys/types.h>
40
41/* Not standard, but glibc defines it */
42#define BITS_PER_LONG __WORDSIZE
43
44typedef uint8_t u8;
45typedef uint16_t u16;
46typedef uint32_t u32;
47typedef uint64_t u64;
48
49#ifndef PAGE_SIZE
50# define PAGE_SIZE 4096
51#endif
52extern const char raid6_empty_zero_page[PAGE_SIZE];
53
54#define __init
55#define __exit
56#ifndef __attribute_const__
57# define __attribute_const__ __attribute__((const))
58#endif
59#define noinline __attribute__((noinline))
60
61#define preempt_enable()
62#define preempt_disable()
63#define cpu_has_feature(x) 1
64#define enable_kernel_altivec()
65#define disable_kernel_altivec()
66
67#define EXPORT_SYMBOL(sym)
68#define EXPORT_SYMBOL_GPL(sym)
69#define MODULE_LICENSE(licence)
70#define MODULE_DESCRIPTION(desc)
71#define subsys_initcall(x)
72#define module_exit(x)
73
74#define IS_ENABLED(x) (x)
75#define CONFIG_RAID6_PQ_BENCHMARK 1
76#endif /* __KERNEL__ */
77
78/* Routine choices */
79struct raid6_calls {
80 void (*gen_syndrome)(int, size_t, void **);
81 void (*xor_syndrome)(int, int, int, size_t, void **);
82 int (*valid)(void); /* Returns 1 if this routine set is usable */
83 const char *name; /* Name of this routine set */
84 int prefer; /* Has special performance attribute */
85};
86
87/* Selected algorithm */
88extern struct raid6_calls raid6_call;
89
90/* Various routine sets */
91extern const struct raid6_calls raid6_intx1;
92extern const struct raid6_calls raid6_intx2;
93extern const struct raid6_calls raid6_intx4;
94extern const struct raid6_calls raid6_intx8;
95extern const struct raid6_calls raid6_intx16;
96extern const struct raid6_calls raid6_intx32;
97extern const struct raid6_calls raid6_mmxx1;
98extern const struct raid6_calls raid6_mmxx2;
99extern const struct raid6_calls raid6_sse1x1;
100extern const struct raid6_calls raid6_sse1x2;
101extern const struct raid6_calls raid6_sse2x1;
102extern const struct raid6_calls raid6_sse2x2;
103extern const struct raid6_calls raid6_sse2x4;
104extern const struct raid6_calls raid6_altivec1;
105extern const struct raid6_calls raid6_altivec2;
106extern const struct raid6_calls raid6_altivec4;
107extern const struct raid6_calls raid6_altivec8;
108extern const struct raid6_calls raid6_avx2x1;
109extern const struct raid6_calls raid6_avx2x2;
110extern const struct raid6_calls raid6_avx2x4;
111extern const struct raid6_calls raid6_avx512x1;
112extern const struct raid6_calls raid6_avx512x2;
113extern const struct raid6_calls raid6_avx512x4;
114extern const struct raid6_calls raid6_s390vx8;
115extern const struct raid6_calls raid6_vpermxor1;
116extern const struct raid6_calls raid6_vpermxor2;
117extern const struct raid6_calls raid6_vpermxor4;
118extern const struct raid6_calls raid6_vpermxor8;
119
120struct raid6_recov_calls {
121 void (*data2)(int, size_t, int, int, void **);
122 void (*datap)(int, size_t, int, void **);
123 int (*valid)(void);
124 const char *name;
125 int priority;
126};
127
128extern const struct raid6_recov_calls raid6_recov_intx1;
129extern const struct raid6_recov_calls raid6_recov_ssse3;
130extern const struct raid6_recov_calls raid6_recov_avx2;
131extern const struct raid6_recov_calls raid6_recov_avx512;
132extern const struct raid6_recov_calls raid6_recov_s390xc;
133extern const struct raid6_recov_calls raid6_recov_neon;
134
135extern const struct raid6_calls raid6_neonx1;
136extern const struct raid6_calls raid6_neonx2;
137extern const struct raid6_calls raid6_neonx4;
138extern const struct raid6_calls raid6_neonx8;
139
140/* Algorithm list */
141extern const struct raid6_calls * const raid6_algos[];
142extern const struct raid6_recov_calls *const raid6_recov_algos[];
143int raid6_select_algo(void);
144
145/* Return values from chk_syndrome */
146#define RAID6_OK 0
147#define RAID6_P_BAD 1
148#define RAID6_Q_BAD 2
149#define RAID6_PQ_BAD 3
150
151/* Galois field tables */
152extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
153extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256)));
154extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
155extern const u8 raid6_gflog[256] __attribute__((aligned(256)));
156extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
157extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
158
159/* Recovery routines */
160extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb,
161 void **ptrs);
162extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila,
163 void **ptrs);
164void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
165 void **ptrs);
166
167/* Some definitions to allow code to be compiled for testing in userspace */
168#ifndef __KERNEL__
169
170# define jiffies raid6_jiffies()
171# define printk printf
172# define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
173# define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__)
174# define GFP_KERNEL 0
175# define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \
176 PROT_READ|PROT_WRITE, \
177 MAP_PRIVATE|MAP_ANONYMOUS,\
178 0, 0))
179# define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y))
180
181static inline void cpu_relax(void)
182{
183 /* Nothing */
184}
185
186#undef HZ
187#define HZ 1000
188static inline uint32_t raid6_jiffies(void)
189{
190 struct timeval tv;
191 gettimeofday(&tv, NULL);
192 return tv.tv_sec*1000 + tv.tv_usec/1000;
193}
194
195#endif /* ! __KERNEL__ */
196
197#endif /* LINUX_RAID_RAID6_H */