[deliverable/linux.git] / drivers / md / raid6.h

/* -*- linux-c -*- ------------------------------------------------------- *
 *
 *   Copyright 2003 H. Peter Anvin - All Rights Reserved
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
 *   Bostom MA 02111-1307, USA; either version 2 of the License, or
 *   (at your option) any later version; incorporated herein by reference.
 *
 * ----------------------------------------------------------------------- */

#ifndef LINUX_RAID_RAID6_H
#define LINUX_RAID_RAID6_H

#ifdef __KERNEL__

/* Set to 1 to use kernel-wide empty_zero_page */
#define RAID6_USE_EMPTY_ZERO_PAGE 0

#include <linux/raid/md.h>
#include <linux/raid/raid5.h>

typedef raid5_conf_t raid6_conf_t; /* Same configuration */

/* Additional compute_parity mode -- updates the parity w/o LOCKING */
#define UPDATE_PARITY	4

/* We need a pre-zeroed page... if we don't want to use the kernel-provided
   one define it here */
#if RAID6_USE_EMPTY_ZERO_PAGE
# define raid6_empty_zero_page empty_zero_page
#else
extern const char raid6_empty_zero_page[PAGE_SIZE];
#endif

#else /* ! __KERNEL__ */
/* Used for testing in user space */

#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <stddef.h>
#include <sys/mman.h>
#include <sys/types.h>

/* Not standard, but glibc defines it */
#define BITS_PER_LONG __WORDSIZE

typedef uint8_t  u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;

#ifndef PAGE_SIZE
# define PAGE_SIZE 4096
#endif
extern const char raid6_empty_zero_page[PAGE_SIZE];

#define __init
#define __exit
#define __attribute_const__ __attribute__((const))
#define noinline __attribute__((noinline))

#define preempt_enable()
#define preempt_disable()
#define cpu_has_feature(x) 1
#define enable_kernel_altivec()
#define disable_kernel_altivec()

#endif /* __KERNEL__ */

/* Routine choices */
struct raid6_calls {
	void (*gen_syndrome)(int, size_t, void **);
	int  (*valid)(void);	/* Returns 1 if this routine set is usable */
	const char *name;	/* Name of this routine set */
	int prefer;		/* Has special performance attribute */
};

/* Selected algorithm */
extern struct raid6_calls raid6_call;

/* Algorithm list */
extern const struct raid6_calls * const raid6_algos[];
int raid6_select_algo(void);

/* Return values from chk_syndrome */
#define RAID6_OK	0
#define RAID6_P_BAD	1
#define RAID6_Q_BAD	2
#define RAID6_PQ_BAD	3

/* Galois field tables */
extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
extern const u8 raid6_gfexp[256]      __attribute__((aligned(256)));
extern const u8 raid6_gfinv[256]      __attribute__((aligned(256)));
extern const u8 raid6_gfexi[256]      __attribute__((aligned(256)));

/* Recovery routines */
void raid6_2data_recov(int disks, size_t bytes, int faila, int failb, void **ptrs);
void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs);
void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, void **ptrs);

/* Some definitions to allow code to be compiled for testing in userspace */
#ifndef __KERNEL__

# define jiffies	raid6_jiffies()
# define printk 	printf
# define GFP_KERNEL	0
# define __get_free_pages(x,y)	((unsigned long)mmap(NULL, PAGE_SIZE << (y), PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0))
# define free_pages(x,y)	munmap((void *)(x), (y)*PAGE_SIZE)

static inline void cpu_relax(void)
{
	/* Nothing */
}

#undef  HZ
#define HZ 1000
static inline uint32_t raid6_jiffies(void)
{
	struct timeval tv;
	gettimeofday(&tv, NULL);
	return tv.tv_sec*1000 + tv.tv_usec/1000;
}

#endif /* ! __KERNEL__ */

#endif /* LINUX_RAID_RAID6_H */
Commit	Line	Data
1da177e4 LT	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	* Bostom 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
1da177e4 LT	21	#include <linux/raid/md.h>
	22	#include <linux/raid/raid5.h>
	23
	24	typedef raid5_conf_t raid6_conf_t; /* Same configuration */
	25
	26	/* Additional compute_parity mode -- updates the parity w/o LOCKING */
	27	#define UPDATE_PARITY 4
	28
	29	/* We need a pre-zeroed page... if we don't want to use the kernel-provided
	30	one define it here */
	31	#if RAID6_USE_EMPTY_ZERO_PAGE
	32	# define raid6_empty_zero_page empty_zero_page
	33	#else
	34	extern const char raid6_empty_zero_page[PAGE_SIZE];
	35	#endif
	36
	37	#else /* ! __KERNEL__ */
	38	/* Used for testing in user space */
	39
	40	#include <errno.h>
	41	#include <inttypes.h>
	42	#include <limits.h>
	43	#include <stddef.h>
	44	#include <sys/mman.h>
	45	#include <sys/types.h>
	46
	47	/* Not standard, but glibc defines it */
	48	#define BITS_PER_LONG __WORDSIZE
	49
	50	typedef uint8_t u8;
	51	typedef uint16_t u16;
	52	typedef uint32_t u32;
	53	typedef uint64_t u64;
	54
	55	#ifndef PAGE_SIZE
	56	# define PAGE_SIZE 4096
	57	#endif
	58	extern const char raid6_empty_zero_page[PAGE_SIZE];
	59
	60	#define __init
	61	#define __exit
	62	#define __attribute_const__ __attribute__((const))
d7e70ba4	63	#define noinline __attribute__((noinline))
1da177e4 LT	64
	65	#define preempt_enable()
	66	#define preempt_disable()
d7e70ba4 PA	67	#define cpu_has_feature(x) 1
	68	#define enable_kernel_altivec()
	69	#define disable_kernel_altivec()
1da177e4 LT	70
	71	#endif /* __KERNEL__ */
	72
	73	/* Routine choices */
	74	struct raid6_calls {
	75	void (gen_syndrome)(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	/* Algorithm list */
	85	extern const struct raid6_calls * const raid6_algos[];
	86	int raid6_select_algo(void);
	87
	88	/* Return values from chk_syndrome */
	89	#define RAID6_OK 0
	90	#define RAID6_P_BAD 1
	91	#define RAID6_Q_BAD 2
	92	#define RAID6_PQ_BAD 3
	93
	94	/* Galois field tables */
	95	extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
	96	extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
	97	extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
	98	extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
	99
	100	/* Recovery routines */
	101	void raid6_2data_recov(int disks, size_t bytes, int faila, int failb, void **ptrs);
	102	void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs);
	103	void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, void **ptrs);
	104
	105	/* Some definitions to allow code to be compiled for testing in userspace */
	106	#ifndef __KERNEL__
	107
	108	# define jiffies raid6_jiffies()
	109	# define printk printf
	110	# define GFP_KERNEL 0
	111	# define __get_free_pages(x,y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), PROT_READ\|PROT_WRITE, MAP_PRIVATE\|MAP_ANONYMOUS, 0, 0))
	112	# define free_pages(x,y) munmap((void )(x), (y)PAGE_SIZE)
	113
	114	static inline void cpu_relax(void)
	115	{
	116	/* Nothing */
	117	}
	118
	119	#undef HZ
	120	#define HZ 1000
	121	static inline uint32_t raid6_jiffies(void)
	122	{
	123	struct timeval tv;
	124	gettimeofday(&tv, NULL);
	125	return tv.tv_sec*1000 + tv.tv_usec/1000;
	126	}
	127
	128	#endif /* ! __KERNEL__ */
	129
	130	#endif /* LINUX_RAID_RAID6_H */