1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* -*- linux-c -*- ------------------------------------------------------- *
4 * Copyright 2003 H. Peter Anvin - All Rights Reserved
6 * ----------------------------------------------------------------------- */
8 #ifndef LINUX_RAID_RAID6_H
9 #define LINUX_RAID_RAID6_H
13 /* Set to 1 to use kernel-wide empty_zero_page */
14 #define RAID6_USE_EMPTY_ZERO_PAGE 0
15 #include <linux/blkdev.h>
17 /* We need a pre-zeroed page... if we don't want to use the kernel-provided
19 #if RAID6_USE_EMPTY_ZERO_PAGE
20 # define raid6_empty_zero_page empty_zero_page
22 extern const char raid6_empty_zero_page[PAGE_SIZE];
25 #else /* ! __KERNEL__ */
26 /* Used for testing in user space */
34 #include <sys/types.h>
36 /* Not standard, but glibc defines it */
37 #define BITS_PER_LONG __WORDSIZE
45 # define PAGE_SIZE 4096
47 extern const char raid6_empty_zero_page[PAGE_SIZE];
51 #ifndef __attribute_const__
52 # define __attribute_const__ __attribute__((const))
54 #define noinline __attribute__((noinline))
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()
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)
69 #define IS_ENABLED(x) (x)
70 #define CONFIG_RAID6_PQ_BENCHMARK 1
71 #endif /* __KERNEL__ */
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 */
82 /* Selected algorithm */
83 extern struct raid6_calls raid6_call;
85 /* Various routine sets */
86 extern const struct raid6_calls raid6_intx1;
87 extern const struct raid6_calls raid6_intx2;
88 extern const struct raid6_calls raid6_intx4;
89 extern const struct raid6_calls raid6_intx8;
90 extern const struct raid6_calls raid6_intx16;
91 extern const struct raid6_calls raid6_intx32;
92 extern const struct raid6_calls raid6_mmxx1;
93 extern const struct raid6_calls raid6_mmxx2;
94 extern const struct raid6_calls raid6_sse1x1;
95 extern const struct raid6_calls raid6_sse1x2;
96 extern const struct raid6_calls raid6_sse2x1;
97 extern const struct raid6_calls raid6_sse2x2;
98 extern const struct raid6_calls raid6_sse2x4;
99 extern const struct raid6_calls raid6_altivec1;
100 extern const struct raid6_calls raid6_altivec2;
101 extern const struct raid6_calls raid6_altivec4;
102 extern const struct raid6_calls raid6_altivec8;
103 extern const struct raid6_calls raid6_avx2x1;
104 extern const struct raid6_calls raid6_avx2x2;
105 extern const struct raid6_calls raid6_avx2x4;
106 extern const struct raid6_calls raid6_avx512x1;
107 extern const struct raid6_calls raid6_avx512x2;
108 extern const struct raid6_calls raid6_avx512x4;
109 extern const struct raid6_calls raid6_s390vx8;
110 extern const struct raid6_calls raid6_vpermxor1;
111 extern const struct raid6_calls raid6_vpermxor2;
112 extern const struct raid6_calls raid6_vpermxor4;
113 extern const struct raid6_calls raid6_vpermxor8;
115 struct raid6_recov_calls {
116 void (*data2)(int, size_t, int, int, void **);
117 void (*datap)(int, size_t, int, void **);
123 extern const struct raid6_recov_calls raid6_recov_intx1;
124 extern const struct raid6_recov_calls raid6_recov_ssse3;
125 extern const struct raid6_recov_calls raid6_recov_avx2;
126 extern const struct raid6_recov_calls raid6_recov_avx512;
127 extern const struct raid6_recov_calls raid6_recov_s390xc;
128 extern const struct raid6_recov_calls raid6_recov_neon;
130 extern const struct raid6_calls raid6_neonx1;
131 extern const struct raid6_calls raid6_neonx2;
132 extern const struct raid6_calls raid6_neonx4;
133 extern const struct raid6_calls raid6_neonx8;
136 extern const struct raid6_calls * const raid6_algos[];
137 extern const struct raid6_recov_calls *const raid6_recov_algos[];
138 int raid6_select_algo(void);
140 /* Return values from chk_syndrome */
142 #define RAID6_P_BAD 1
143 #define RAID6_Q_BAD 2
144 #define RAID6_PQ_BAD 3
146 /* Galois field tables */
147 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
148 extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256)));
149 extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
150 extern const u8 raid6_gflog[256] __attribute__((aligned(256)));
151 extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
152 extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
154 /* Recovery routines */
155 extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb,
157 extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila,
159 void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
162 /* Some definitions to allow code to be compiled for testing in userspace */
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,\
174 # define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y))
176 static inline void cpu_relax(void)
183 static inline uint32_t raid6_jiffies(void)
186 gettimeofday(&tv, NULL);
187 return tv.tv_sec*1000 + tv.tv_usec/1000;
190 #endif /* ! __KERNEL__ */
192 #endif /* LINUX_RAID_RAID6_H */