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#include <linux/mm.h>
15
16/* This should be const but the raid6 code is too convoluted for that. */
17static inline void *raid6_get_zero_page(void)
18{
19 return page_address(ZERO_PAGE(0));
20}
21
22#else /* ! __KERNEL__ */
23/* Used for testing in user space */
24
25#include <errno.h>
26#include <inttypes.h>
27#include <stddef.h>
28#include <string.h>
29#include <sys/mman.h>
30#include <sys/time.h>
31#include <sys/types.h>
32
33/* Not standard, but glibc defines it */
34#define BITS_PER_LONG __WORDSIZE
35
36typedef uint8_t u8;
37typedef uint16_t u16;
38typedef uint32_t u32;
39typedef uint64_t u64;
40
41#ifndef PAGE_SIZE
42# define PAGE_SIZE 4096
43#endif
44#ifndef PAGE_SHIFT
45# define PAGE_SHIFT 12
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#undef EXPORT_SYMBOL
63#define EXPORT_SYMBOL(sym)
64#undef EXPORT_SYMBOL_GPL
65#define EXPORT_SYMBOL_GPL(sym)
66#define MODULE_LICENSE(licence)
67#define MODULE_DESCRIPTION(desc)
68#define subsys_initcall(x)
69#define module_exit(x)
70
71#define IS_ENABLED(x) (x)
72#define CONFIG_RAID6_PQ_BENCHMARK 1
73#endif /* __KERNEL__ */
74
75/* Routine choices */
76struct raid6_calls {
77 void (*gen_syndrome)(int, size_t, void **);
78 void (*xor_syndrome)(int, int, int, size_t, void **);
79 int (*valid)(void); /* Returns 1 if this routine set is usable */
80 const char *name; /* Name of this routine set */
81 int priority; /* Relative priority ranking if non-zero */
82};
83
84/* Selected algorithm */
85extern struct raid6_calls raid6_call;
86
87/* Various routine sets */
88extern const struct raid6_calls raid6_intx1;
89extern const struct raid6_calls raid6_intx2;
90extern const struct raid6_calls raid6_intx4;
91extern const struct raid6_calls raid6_intx8;
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;
114extern const struct raid6_calls raid6_lsx;
115extern const struct raid6_calls raid6_lasx;
116extern const struct raid6_calls raid6_rvvx1;
117extern const struct raid6_calls raid6_rvvx2;
118extern const struct raid6_calls raid6_rvvx4;
119extern const struct raid6_calls raid6_rvvx8;
120
121struct raid6_recov_calls {
122 void (*data2)(int, size_t, int, int, void **);
123 void (*datap)(int, size_t, int, void **);
124 int (*valid)(void);
125 const char *name;
126 int priority;
127};
128
129extern const struct raid6_recov_calls raid6_recov_intx1;
130extern const struct raid6_recov_calls raid6_recov_ssse3;
131extern const struct raid6_recov_calls raid6_recov_avx2;
132extern const struct raid6_recov_calls raid6_recov_avx512;
133extern const struct raid6_recov_calls raid6_recov_s390xc;
134extern const struct raid6_recov_calls raid6_recov_neon;
135extern const struct raid6_recov_calls raid6_recov_lsx;
136extern const struct raid6_recov_calls raid6_recov_lasx;
137extern const struct raid6_recov_calls raid6_recov_rvv;
138
139extern const struct raid6_calls raid6_neonx1;
140extern const struct raid6_calls raid6_neonx2;
141extern const struct raid6_calls raid6_neonx4;
142extern const struct raid6_calls raid6_neonx8;
143
144/* Algorithm list */
145extern const struct raid6_calls * const raid6_algos[];
146extern const struct raid6_recov_calls *const raid6_recov_algos[];
147int raid6_select_algo(void);
148
149/* Return values from chk_syndrome */
150#define RAID6_OK 0
151#define RAID6_P_BAD 1
152#define RAID6_Q_BAD 2
153#define RAID6_PQ_BAD 3
154
155/* Galois field tables */
156extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
157extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256)));
158extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
159extern const u8 raid6_gflog[256] __attribute__((aligned(256)));
160extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
161extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
162
163/* Recovery routines */
164extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb,
165 void **ptrs);
166extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila,
167 void **ptrs);
168void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
169 void **ptrs);
170
171/* Some definitions to allow code to be compiled for testing in userspace */
172#ifndef __KERNEL__
173
174# define jiffies raid6_jiffies()
175# define printk printf
176# define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
177# define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__)
178# define GFP_KERNEL 0
179# define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \
180 PROT_READ|PROT_WRITE, \
181 MAP_PRIVATE|MAP_ANONYMOUS,\
182 0, 0))
183# define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y))
184
185static inline void cpu_relax(void)
186{
187 /* Nothing */
188}
189
190#undef HZ
191#define HZ 1000
192static inline uint32_t raid6_jiffies(void)
193{
194 struct timeval tv;
195 gettimeofday(&tv, NULL);
196 return tv.tv_sec*1000 + tv.tv_usec/1000;
197}
198
199static inline void *raid6_get_zero_page(void)
200{
201 return raid6_empty_zero_page;
202}
203
204#endif /* ! __KERNEL__ */
205
206#endif /* LINUX_RAID_RAID6_H */