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Linux/include/linux/raid/pq.h

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  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
 27 extern 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/types.h>
 39 
 40 /* Not standard, but glibc defines it */
 41 #define BITS_PER_LONG __WORDSIZE
 42 
 43 typedef uint8_t  u8;
 44 typedef uint16_t u16;
 45 typedef uint32_t u32;
 46 typedef uint64_t u64;
 47 
 48 #ifndef PAGE_SIZE
 49 # define PAGE_SIZE 4096
 50 #endif
 51 extern const char raid6_empty_zero_page[PAGE_SIZE];
 52 
 53 #define __init
 54 #define __exit
 55 #define __attribute_const__ __attribute__((const))
 56 #define noinline __attribute__((noinline))
 57 
 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()
 63 
 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__ */
 71 
 72 /* Routine choices */
 73 struct raid6_calls {
 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 */
 79 };
 80 
 81 /* Selected algorithm */
 82 extern struct raid6_calls raid6_call;
 83 
 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_avx512x1;
106 extern const struct raid6_calls raid6_avx512x2;
107 extern const struct raid6_calls raid6_avx512x4;
108 extern const struct raid6_calls raid6_s390vx8;
109 extern const struct raid6_calls raid6_vpermxor1;
110 extern const struct raid6_calls raid6_vpermxor2;
111 extern const struct raid6_calls raid6_vpermxor4;
112 extern const struct raid6_calls raid6_vpermxor8;
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 
129 extern const struct raid6_calls raid6_neonx1;
130 extern const struct raid6_calls raid6_neonx2;
131 extern const struct raid6_calls raid6_neonx4;
132 extern const struct raid6_calls raid6_neonx8;
133 
134 /* Algorithm list */
135 extern const struct raid6_calls * const raid6_algos[];
136 extern const struct raid6_recov_calls *const raid6_recov_algos[];
137 int raid6_select_algo(void);
138 
139 /* Return values from chk_syndrome */
140 #define RAID6_OK        0
141 #define RAID6_P_BAD     1
142 #define RAID6_Q_BAD     2
143 #define RAID6_PQ_BAD    3
144 
145 /* Galois field tables */
146 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
147 extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256)));
148 extern const u8 raid6_gfexp[256]      __attribute__((aligned(256)));
149 extern const u8 raid6_gflog[256]      __attribute__((aligned(256)));
150 extern const u8 raid6_gfinv[256]      __attribute__((aligned(256)));
151 extern const u8 raid6_gfexi[256]      __attribute__((aligned(256)));
152 
153 /* Recovery routines */
154 extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb,
155                        void **ptrs);
156 extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila,
157                         void **ptrs);
158 void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
159                       void **ptrs);
160 
161 /* Some definitions to allow code to be compiled for testing in userspace */
162 #ifndef __KERNEL__
163 
164 # define jiffies        raid6_jiffies()
165 # define printk         printf
166 # define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
167 # define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__)
168 # define GFP_KERNEL     0
169 # define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \
170                                                      PROT_READ|PROT_WRITE,   \
171                                                      MAP_PRIVATE|MAP_ANONYMOUS,\
172                                                      0, 0))
173 # define free_pages(x, y)       munmap((void *)(x), PAGE_SIZE << (y))
174 
175 static inline void cpu_relax(void)
176 {
177         /* Nothing */
178 }
179 
180 #undef  HZ
181 #define HZ 1000
182 static inline uint32_t raid6_jiffies(void)
183 {
184         struct timeval tv;
185         gettimeofday(&tv, NULL);
186         return tv.tv_sec*1000 + tv.tv_usec/1000;
187 }
188 
189 #endif /* ! __KERNEL__ */
190 
191 #endif /* LINUX_RAID_RAID6_H */
192 

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