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
15 extern 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
31 typedef uint8_t u8;
32 typedef uint16_t u16;
33 typedef uint32_t u32;
34 typedef 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
42 extern 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 */
71 struct 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 */
80 extern struct raid6_calls raid6_call;
81
82 /* Various routine sets */
83 extern const struct raid6_calls raid6_intx1;
84 extern const struct raid6_calls raid6_intx2;
85 extern const struct raid6_calls raid6_intx4;
86 extern const struct raid6_calls raid6_intx8;
87 extern const struct raid6_calls raid6_intx16;
88 extern const struct raid6_calls raid6_intx32;
89 extern const struct raid6_calls raid6_mmxx1;
90 extern const struct raid6_calls raid6_mmxx2;
91 extern const struct raid6_calls raid6_sse1x1;
92 extern const struct raid6_calls raid6_sse1x2;
93 extern const struct raid6_calls raid6_sse2x1;
94 extern const struct raid6_calls raid6_sse2x2;
95 extern const struct raid6_calls raid6_sse2x4;
96 extern const struct raid6_calls raid6_altivec1;
97 extern const struct raid6_calls raid6_altivec2;
98 extern const struct raid6_calls raid6_altivec4;
99 extern const struct raid6_calls raid6_altivec8;
100 extern const struct raid6_calls raid6_avx2x1;
101 extern const struct raid6_calls raid6_avx2x2;
102 extern const struct raid6_calls raid6_avx2x4;
103 extern const struct raid6_calls raid6_avx512x1;
104 extern const struct raid6_calls raid6_avx512x2;
105 extern const struct raid6_calls raid6_avx512x4;
106 extern const struct raid6_calls raid6_s390vx8;
107 extern const struct raid6_calls raid6_vpermxor1;
108 extern const struct raid6_calls raid6_vpermxor2;
109 extern const struct raid6_calls raid6_vpermxor4;
110 extern const struct raid6_calls raid6_vpermxor8;
111 extern const struct raid6_calls raid6_lsx;
112 extern const struct raid6_calls raid6_lasx;
113
114 struct raid6_recov_calls {
115 void (*data2)(int, size_t, int, int, void **);
116 void (*datap)(int, size_t, int, void **);
117 int (*valid)(void);
118 const char *name;
119 int priority;
120 };
121
122 extern const struct raid6_recov_calls raid6_recov_intx1;
123 extern const struct raid6_recov_calls raid6_recov_ssse3;
124 extern const struct raid6_recov_calls raid6_recov_avx2;
125 extern const struct raid6_recov_calls raid6_recov_avx512;
126 extern const struct raid6_recov_calls raid6_recov_s390xc;
127 extern const struct raid6_recov_calls raid6_recov_neon;
128 extern const struct raid6_recov_calls raid6_recov_lsx;
129 extern const struct raid6_recov_calls raid6_recov_lasx;
130
131 extern const struct raid6_calls raid6_neonx1;
132 extern const struct raid6_calls raid6_neonx2;
133 extern const struct raid6_calls raid6_neonx4;
134 extern const struct raid6_calls raid6_neonx8;
135
136 /* Algorithm list */
137 extern const struct raid6_calls * const raid6_algos[];
138 extern const struct raid6_recov_calls *const raid6_recov_algos[];
139 int raid6_select_algo(void);
140
141 /* Return values from chk_syndrome */
142 #define RAID6_OK 0
143 #define RAID6_P_BAD 1
144 #define RAID6_Q_BAD 2
145 #define RAID6_PQ_BAD 3
146
147 /* Galois field tables */
148 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
149 extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256)));
150 extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
151 extern const u8 raid6_gflog[256] __attribute__((aligned(256)));
152 extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
153 extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
154
155 /* Recovery routines */
156 extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb,
157 void **ptrs);
158 extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila,
159 void **ptrs);
160 void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
161 void **ptrs);
162
163 /* Some definitions to allow code to be compiled for testing in userspace */
164 #ifndef __KERNEL__
165
166 # define jiffies raid6_jiffies()
167 # define printk printf
168 # define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
169 # define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__)
170 # define GFP_KERNEL 0
171 # define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \
172 PROT_READ|PROT_WRITE, \
173 MAP_PRIVATE|MAP_ANONYMOUS,\
174 0, 0))
175 # define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y))
176
cpu_relax(void)177 static inline void cpu_relax(void)
178 {
179 /* Nothing */
180 }
181
182 #undef HZ
183 #define HZ 1000
raid6_jiffies(void)184 static inline uint32_t raid6_jiffies(void)
185 {
186 struct timeval tv;
187 gettimeofday(&tv, NULL);
188 return tv.tv_sec*1000 + tv.tv_usec/1000;
189 }
190
191 #endif /* ! __KERNEL__ */
192
193 #endif /* LINUX_RAID_RAID6_H */
194