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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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b5dceda1f7
The raid6_gfexp table represents {2}^n values for 0 <= n < 256. The
Linux async_tx framework pass values from raid6_gfexp as coefficients
for each source to prep_dma_pq() callback of DMA channel with PQ
capability. This creates problem for RAID6 offload engines (such as
Broadcom SBA) which take disk position (i.e. log of {2}) instead of
multiplicative cofficients from raid6_gfexp table.
This patch adds raid6_gflog table having log-of-2 value for any given
x such that 0 <= x < 256. For any given disk coefficient x, the
corresponding disk position is given by raid6_gflog[x]. The RAID6
offload engine driver can use this newly added raid6_gflog table to
get disk position from multiplicative coefficient.
Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Acked-by: Shaohua Li <shli@fb.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
188 lines
5.9 KiB
C
188 lines
5.9 KiB
C
/* -*- linux-c -*- ------------------------------------------------------- *
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*
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* Copyright 2003 H. Peter Anvin - All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
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* Boston MA 02111-1307, USA; either version 2 of the License, or
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* (at your option) any later version; incorporated herein by reference.
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*
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* ----------------------------------------------------------------------- */
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#ifndef LINUX_RAID_RAID6_H
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#define LINUX_RAID_RAID6_H
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#ifdef __KERNEL__
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/* Set to 1 to use kernel-wide empty_zero_page */
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#define RAID6_USE_EMPTY_ZERO_PAGE 0
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#include <linux/blkdev.h>
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/* We need a pre-zeroed page... if we don't want to use the kernel-provided
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one define it here */
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#if RAID6_USE_EMPTY_ZERO_PAGE
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# define raid6_empty_zero_page empty_zero_page
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#else
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extern const char raid6_empty_zero_page[PAGE_SIZE];
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#endif
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#else /* ! __KERNEL__ */
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/* Used for testing in user space */
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#include <errno.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <stddef.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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/* Not standard, but glibc defines it */
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#define BITS_PER_LONG __WORDSIZE
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typedef uint8_t u8;
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typedef uint16_t u16;
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typedef uint32_t u32;
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typedef uint64_t u64;
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#ifndef PAGE_SIZE
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# define PAGE_SIZE 4096
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#endif
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extern const char raid6_empty_zero_page[PAGE_SIZE];
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#define __init
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#define __exit
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#define __attribute_const__ __attribute__((const))
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#define noinline __attribute__((noinline))
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#define preempt_enable()
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#define preempt_disable()
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#define cpu_has_feature(x) 1
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#define enable_kernel_altivec()
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#define disable_kernel_altivec()
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#define EXPORT_SYMBOL(sym)
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#define EXPORT_SYMBOL_GPL(sym)
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#define MODULE_LICENSE(licence)
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#define MODULE_DESCRIPTION(desc)
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#define subsys_initcall(x)
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#define module_exit(x)
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#endif /* __KERNEL__ */
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/* Routine choices */
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struct raid6_calls {
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void (*gen_syndrome)(int, size_t, void **);
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void (*xor_syndrome)(int, int, int, size_t, void **);
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int (*valid)(void); /* Returns 1 if this routine set is usable */
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const char *name; /* Name of this routine set */
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int prefer; /* Has special performance attribute */
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};
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/* Selected algorithm */
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extern struct raid6_calls raid6_call;
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/* Various routine sets */
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extern const struct raid6_calls raid6_intx1;
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extern const struct raid6_calls raid6_intx2;
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extern const struct raid6_calls raid6_intx4;
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extern const struct raid6_calls raid6_intx8;
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extern const struct raid6_calls raid6_intx16;
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extern const struct raid6_calls raid6_intx32;
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extern const struct raid6_calls raid6_mmxx1;
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extern const struct raid6_calls raid6_mmxx2;
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extern const struct raid6_calls raid6_sse1x1;
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extern const struct raid6_calls raid6_sse1x2;
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extern const struct raid6_calls raid6_sse2x1;
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extern const struct raid6_calls raid6_sse2x2;
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extern const struct raid6_calls raid6_sse2x4;
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extern const struct raid6_calls raid6_altivec1;
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extern const struct raid6_calls raid6_altivec2;
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extern const struct raid6_calls raid6_altivec4;
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extern const struct raid6_calls raid6_altivec8;
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extern const struct raid6_calls raid6_avx2x1;
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extern const struct raid6_calls raid6_avx2x2;
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extern const struct raid6_calls raid6_avx2x4;
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extern const struct raid6_calls raid6_avx512x1;
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extern const struct raid6_calls raid6_avx512x2;
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extern const struct raid6_calls raid6_avx512x4;
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extern const struct raid6_calls raid6_tilegx8;
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extern const struct raid6_calls raid6_s390vx8;
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struct raid6_recov_calls {
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void (*data2)(int, size_t, int, int, void **);
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void (*datap)(int, size_t, int, void **);
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int (*valid)(void);
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const char *name;
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int priority;
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};
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extern const struct raid6_recov_calls raid6_recov_intx1;
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extern const struct raid6_recov_calls raid6_recov_ssse3;
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extern const struct raid6_recov_calls raid6_recov_avx2;
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extern const struct raid6_recov_calls raid6_recov_avx512;
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extern const struct raid6_recov_calls raid6_recov_s390xc;
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extern const struct raid6_calls raid6_neonx1;
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extern const struct raid6_calls raid6_neonx2;
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extern const struct raid6_calls raid6_neonx4;
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extern const struct raid6_calls raid6_neonx8;
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/* Algorithm list */
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extern const struct raid6_calls * const raid6_algos[];
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extern const struct raid6_recov_calls *const raid6_recov_algos[];
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int raid6_select_algo(void);
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/* Return values from chk_syndrome */
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#define RAID6_OK 0
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#define RAID6_P_BAD 1
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#define RAID6_Q_BAD 2
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#define RAID6_PQ_BAD 3
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/* Galois field tables */
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extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
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extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256)));
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extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
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extern const u8 raid6_gflog[256] __attribute__((aligned(256)));
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extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
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extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
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/* Recovery routines */
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extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb,
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void **ptrs);
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extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila,
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void **ptrs);
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void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
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void **ptrs);
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/* Some definitions to allow code to be compiled for testing in userspace */
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#ifndef __KERNEL__
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# define jiffies raid6_jiffies()
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# define printk printf
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# define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
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# define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__)
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# define GFP_KERNEL 0
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# define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \
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PROT_READ|PROT_WRITE, \
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MAP_PRIVATE|MAP_ANONYMOUS,\
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0, 0))
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# define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y))
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static inline void cpu_relax(void)
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{
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/* Nothing */
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}
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#undef HZ
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#define HZ 1000
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static inline uint32_t raid6_jiffies(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv.tv_sec*1000 + tv.tv_usec/1000;
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}
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#endif /* ! __KERNEL__ */
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#endif /* LINUX_RAID_RAID6_H */
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