1 /* -*- linux-c -*- ------------------------------------------------------- *
3 * Copyright 2003 H. Peter Anvin - All Rights Reserved
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.
11 * ----------------------------------------------------------------------- */
13 #ifndef LINUX_RAID_RAID6_H
14 #define LINUX_RAID_RAID6_H
18 /* Set to 1 to use kernel-wide empty_zero_page */
19 #define RAID6_USE_EMPTY_ZERO_PAGE 0
20 #include <linux/blkdev.h>
22 /* We need a pre-zeroed page... if we don't want to use the kernel-provided
24 #if RAID6_USE_EMPTY_ZERO_PAGE
25 # define raid6_empty_zero_page empty_zero_page
27 extern const char raid6_empty_zero_page[PAGE_SIZE];
30 #else /* ! __KERNEL__ */
31 /* Used for testing in user space */
38 #include <sys/types.h>
40 /* Not standard, but glibc defines it */
41 #define BITS_PER_LONG __WORDSIZE
49 # define PAGE_SIZE 4096
51 extern const char raid6_empty_zero_page[PAGE_SIZE];
55 #define __attribute_const__ __attribute__((const))
56 #define noinline __attribute__((noinline))
58 #define preempt_enable()
59 #define preempt_disable()
60 #define cpu_has_feature(x) 1
61 #define enable_kernel_altivec()
62 #define disable_kernel_altivec()
64 #define EXPORT_SYMBOL(sym)
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 #endif /* __KERNEL__ */
74 void (*gen_syndrome)(int, size_t, void **);
75 void (*xor_syndrome)(int, int, int, size_t, void **);
76 int (*valid)(void); /* Returns 1 if this routine set is usable */
77 const char *name; /* Name of this routine set */
78 int prefer; /* Has special performance attribute */
81 /* Selected algorithm */
82 extern struct raid6_calls raid6_call;
84 /* Various routine sets */
85 extern const struct raid6_calls raid6_intx1;
86 extern const struct raid6_calls raid6_intx2;
87 extern const struct raid6_calls raid6_intx4;
88 extern const struct raid6_calls raid6_intx8;
89 extern const struct raid6_calls raid6_intx16;
90 extern const struct raid6_calls raid6_intx32;
91 extern const struct raid6_calls raid6_mmxx1;
92 extern const struct raid6_calls raid6_mmxx2;
93 extern const struct raid6_calls raid6_sse1x1;
94 extern const struct raid6_calls raid6_sse1x2;
95 extern const struct raid6_calls raid6_sse2x1;
96 extern const struct raid6_calls raid6_sse2x2;
97 extern const struct raid6_calls raid6_sse2x4;
98 extern const struct raid6_calls raid6_altivec1;
99 extern const struct raid6_calls raid6_altivec2;
100 extern const struct raid6_calls raid6_altivec4;
101 extern const struct raid6_calls raid6_altivec8;
102 extern const struct raid6_calls raid6_avx2x1;
103 extern const struct raid6_calls raid6_avx2x2;
104 extern const struct raid6_calls raid6_avx2x4;
105 extern const struct raid6_calls raid6_tilegx8;
106 extern const struct raid6_calls raid6_s390vx8;
108 struct raid6_recov_calls {
109 void (*data2)(int, size_t, int, int, void **);
110 void (*datap)(int, size_t, int, void **);
116 extern const struct raid6_recov_calls raid6_recov_intx1;
117 extern const struct raid6_recov_calls raid6_recov_ssse3;
118 extern const struct raid6_recov_calls raid6_recov_avx2;
119 extern const struct raid6_recov_calls raid6_recov_s390xc;
121 extern const struct raid6_calls raid6_neonx1;
122 extern const struct raid6_calls raid6_neonx2;
123 extern const struct raid6_calls raid6_neonx4;
124 extern const struct raid6_calls raid6_neonx8;
127 extern const struct raid6_calls * const raid6_algos[];
128 extern const struct raid6_recov_calls *const raid6_recov_algos[];
129 int raid6_select_algo(void);
131 /* Return values from chk_syndrome */
133 #define RAID6_P_BAD 1
134 #define RAID6_Q_BAD 2
135 #define RAID6_PQ_BAD 3
137 /* Galois field tables */
138 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
139 extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256)));
140 extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
141 extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
142 extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
144 /* Recovery routines */
145 extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb,
147 extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila,
149 void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
152 /* Some definitions to allow code to be compiled for testing in userspace */
155 # define jiffies raid6_jiffies()
156 # define printk printf
157 # define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
158 # define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__)
159 # define GFP_KERNEL 0
160 # define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \
161 PROT_READ|PROT_WRITE, \
162 MAP_PRIVATE|MAP_ANONYMOUS,\
164 # define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y))
166 static inline void cpu_relax(void)
173 static inline uint32_t raid6_jiffies(void)
176 gettimeofday(&tv, NULL);
177 return tv.tv_sec*1000 + tv.tv_usec/1000;
180 #endif /* ! __KERNEL__ */
182 #endif /* LINUX_RAID_RAID6_H */