lib/raid6: Add SSSE3 optimized recovery functions
Add SSSE3 optimized recovery functions, as well as a system for selecting the most appropriate recovery functions to use. Originally-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Jim Kukunas
NeilBrown
parent
f674ef7b43
commit
048a8b8c89
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@ -99,8 +99,20 @@ 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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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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/* 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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@ -111,14 +123,16 @@ int raid6_select_algo(void);
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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_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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void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
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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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void raid6_datap_recov(int disks, size_t bytes, int faila, 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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@ -1,6 +1,6 @@
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obj-$(CONFIG_RAID6_PQ) += raid6_pq.o
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raid6_pq-y += algos.o recov.o tables.o int1.o int2.o int4.o \
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raid6_pq-y += algos.o recov.o recov_ssse3.o tables.o int1.o int2.o int4.o \
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int8.o int16.o int32.o altivec1.o altivec2.o altivec4.o \
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altivec8.o mmx.o sse1.o sse2.o
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hostprogs-y += mktables
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@ -64,6 +64,20 @@ const struct raid6_calls * const raid6_algos[] = {
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NULL
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};
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void (*raid6_2data_recov)(int, size_t, int, int, void **);
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EXPORT_SYMBOL_GPL(raid6_2data_recov);
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void (*raid6_datap_recov)(int, size_t, int, void **);
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EXPORT_SYMBOL_GPL(raid6_datap_recov);
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const struct raid6_recov_calls *const raid6_recov_algos[] = {
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#if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)
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&raid6_recov_ssse3,
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#endif
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&raid6_recov_intx1,
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NULL
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};
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#ifdef __KERNEL__
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#define RAID6_TIME_JIFFIES_LG2 4
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#else
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@ -72,6 +86,26 @@ const struct raid6_calls * const raid6_algos[] = {
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#define time_before(x, y) ((x) < (y))
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#endif
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static inline void raid6_choose_recov(void)
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{
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const struct raid6_recov_calls *const *algo;
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const struct raid6_recov_calls *best;
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for (best = NULL, algo = raid6_recov_algos; *algo; algo++)
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if (!best || (*algo)->priority > best->priority)
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if (!(*algo)->valid || (*algo)->valid())
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best = *algo;
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if (best) {
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raid6_2data_recov = best->data2;
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raid6_datap_recov = best->datap;
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printk("raid6: using %s recovery algorithm\n", best->name);
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} else
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printk("raid6: Yikes! No recovery algorithm found!\n");
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}
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/* Try to pick the best algorithm */
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/* This code uses the gfmul table as convenient data set to abuse */
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@ -141,6 +175,9 @@ int __init raid6_select_algo(void)
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free_pages((unsigned long)syndromes, 1);
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/* select raid recover functions */
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raid6_choose_recov();
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return best ? 0 : -EINVAL;
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}
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@ -81,6 +81,31 @@ int main(int argc, char *argv[])
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printf("EXPORT_SYMBOL(raid6_gfmul);\n");
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printf("#endif\n");
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/* Compute vector multiplication table */
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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"raid6_vgfmul[256][32] =\n"
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"{\n");
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for (i = 0; i < 256; i++) {
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printf("\t{\n");
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for (j = 0; j < 16; j += 8) {
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printf("\t\t");
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for (k = 0; k < 8; k++)
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printf("0x%02x,%c", gfmul(i, j + k),
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(k == 7) ? '\n' : ' ');
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}
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for (j = 0; j < 16; j += 8) {
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printf("\t\t");
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for (k = 0; k < 8; k++)
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printf("0x%02x,%c", gfmul(i, (j + k) << 4),
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(k == 7) ? '\n' : ' ');
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}
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printf("\t},\n");
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}
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printf("};\n");
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printf("#ifdef __KERNEL__\n");
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printf("EXPORT_SYMBOL(raid6_vgfmul);\n");
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printf("#endif\n");
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/* Compute power-of-2 table (exponent) */
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v = 1;
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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@ -22,7 +22,7 @@
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#include <linux/raid/pq.h>
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/* Recover two failed data blocks. */
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void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
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void raid6_2data_recov_intx1(int disks, size_t bytes, int faila, int failb,
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void **ptrs)
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{
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u8 *p, *q, *dp, *dq;
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@ -64,10 +64,9 @@ void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
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p++; q++;
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}
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}
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EXPORT_SYMBOL_GPL(raid6_2data_recov);
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/* Recover failure of one data block plus the P block */
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void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs)
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void raid6_datap_recov_intx1(int disks, size_t bytes, int faila, void **ptrs)
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{
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u8 *p, *q, *dq;
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const u8 *qmul; /* Q multiplier table */
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@ -96,7 +95,15 @@ void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs)
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q++; dq++;
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}
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}
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EXPORT_SYMBOL_GPL(raid6_datap_recov);
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const struct raid6_recov_calls raid6_recov_intx1 = {
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.data2 = raid6_2data_recov_intx1,
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.datap = raid6_datap_recov_intx1,
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.valid = NULL,
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.name = "intx1",
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.priority = 0,
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};
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#ifndef __KERNEL__
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/* Testing only */
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@ -0,0 +1,335 @@
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/*
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* Copyright (C) 2012 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; version 2
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* of the License.
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*/
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#if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)
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#include <linux/raid/pq.h>
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#include "x86.h"
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static int raid6_has_ssse3(void)
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{
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return boot_cpu_has(X86_FEATURE_XMM) &&
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boot_cpu_has(X86_FEATURE_XMM2) &&
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boot_cpu_has(X86_FEATURE_SSSE3);
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}
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void raid6_2data_recov_ssse3(int disks, size_t bytes, int faila, int failb,
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void **ptrs)
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{
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u8 *p, *q, *dp, *dq;
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const u8 *pbmul; /* P multiplier table for B data */
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const u8 *qmul; /* Q multiplier table (for both) */
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static const u8 __aligned(16) x0f[16] = {
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0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
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0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f};
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p = (u8 *)ptrs[disks-2];
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q = (u8 *)ptrs[disks-1];
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/* Compute syndrome with zero for the missing data pages
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Use the dead data pages as temporary storage for
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delta p and delta q */
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dp = (u8 *)ptrs[faila];
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ptrs[faila] = (void *)raid6_empty_zero_page;
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ptrs[disks-2] = dp;
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dq = (u8 *)ptrs[failb];
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ptrs[failb] = (void *)raid6_empty_zero_page;
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ptrs[disks-1] = dq;
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raid6_call.gen_syndrome(disks, bytes, ptrs);
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/* Restore pointer table */
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ptrs[faila] = dp;
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ptrs[failb] = dq;
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ptrs[disks-2] = p;
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ptrs[disks-1] = q;
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/* Now, pick the proper data tables */
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pbmul = raid6_vgfmul[raid6_gfexi[failb-faila]];
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qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila] ^
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raid6_gfexp[failb]]];
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kernel_fpu_begin();
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asm volatile("movdqa %0,%%xmm7" : : "m" (x0f[0]));
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#ifdef CONFIG_X86_64
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asm volatile("movdqa %0,%%xmm6" : : "m" (qmul[0]));
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asm volatile("movdqa %0,%%xmm14" : : "m" (pbmul[0]));
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asm volatile("movdqa %0,%%xmm15" : : "m" (pbmul[16]));
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#endif
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/* Now do it... */
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while (bytes) {
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#ifdef CONFIG_X86_64
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/* xmm6, xmm14, xmm15 */
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asm volatile("movdqa %0,%%xmm1" : : "m" (q[0]));
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asm volatile("movdqa %0,%%xmm9" : : "m" (q[16]));
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asm volatile("movdqa %0,%%xmm0" : : "m" (p[0]));
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asm volatile("movdqa %0,%%xmm8" : : "m" (p[16]));
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asm volatile("pxor %0,%%xmm1" : : "m" (dq[0]));
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asm volatile("pxor %0,%%xmm9" : : "m" (dq[16]));
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asm volatile("pxor %0,%%xmm0" : : "m" (dp[0]));
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asm volatile("pxor %0,%%xmm8" : : "m" (dp[16]));
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/* xmm0/8 = px */
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asm volatile("movdqa %xmm6,%xmm4");
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asm volatile("movdqa %0,%%xmm5" : : "m" (qmul[16]));
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asm volatile("movdqa %xmm6,%xmm12");
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asm volatile("movdqa %xmm5,%xmm13");
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asm volatile("movdqa %xmm1,%xmm3");
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asm volatile("movdqa %xmm9,%xmm11");
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asm volatile("movdqa %xmm0,%xmm2"); /* xmm2/10 = px */
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asm volatile("movdqa %xmm8,%xmm10");
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asm volatile("psraw $4,%xmm1");
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asm volatile("psraw $4,%xmm9");
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asm volatile("pand %xmm7,%xmm3");
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asm volatile("pand %xmm7,%xmm11");
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asm volatile("pand %xmm7,%xmm1");
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asm volatile("pand %xmm7,%xmm9");
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asm volatile("pshufb %xmm3,%xmm4");
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asm volatile("pshufb %xmm11,%xmm12");
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asm volatile("pshufb %xmm1,%xmm5");
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asm volatile("pshufb %xmm9,%xmm13");
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asm volatile("pxor %xmm4,%xmm5");
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asm volatile("pxor %xmm12,%xmm13");
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/* xmm5/13 = qx */
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asm volatile("movdqa %xmm14,%xmm4");
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asm volatile("movdqa %xmm15,%xmm1");
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asm volatile("movdqa %xmm14,%xmm12");
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asm volatile("movdqa %xmm15,%xmm9");
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asm volatile("movdqa %xmm2,%xmm3");
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asm volatile("movdqa %xmm10,%xmm11");
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asm volatile("psraw $4,%xmm2");
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asm volatile("psraw $4,%xmm10");
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asm volatile("pand %xmm7,%xmm3");
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asm volatile("pand %xmm7,%xmm11");
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asm volatile("pand %xmm7,%xmm2");
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asm volatile("pand %xmm7,%xmm10");
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asm volatile("pshufb %xmm3,%xmm4");
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asm volatile("pshufb %xmm11,%xmm12");
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asm volatile("pshufb %xmm2,%xmm1");
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asm volatile("pshufb %xmm10,%xmm9");
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asm volatile("pxor %xmm4,%xmm1");
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asm volatile("pxor %xmm12,%xmm9");
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/* xmm1/9 = pbmul[px] */
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asm volatile("pxor %xmm5,%xmm1");
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asm volatile("pxor %xmm13,%xmm9");
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/* xmm1/9 = db = DQ */
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asm volatile("movdqa %%xmm1,%0" : "=m" (dq[0]));
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asm volatile("movdqa %%xmm9,%0" : "=m" (dq[16]));
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asm volatile("pxor %xmm1,%xmm0");
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asm volatile("pxor %xmm9,%xmm8");
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asm volatile("movdqa %%xmm0,%0" : "=m" (dp[0]));
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asm volatile("movdqa %%xmm8,%0" : "=m" (dp[16]));
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bytes -= 32;
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p += 32;
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q += 32;
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dp += 32;
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dq += 32;
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#else
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asm volatile("movdqa %0,%%xmm1" : : "m" (*q));
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asm volatile("movdqa %0,%%xmm0" : : "m" (*p));
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asm volatile("pxor %0,%%xmm1" : : "m" (*dq));
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asm volatile("pxor %0,%%xmm0" : : "m" (*dp));
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/* 1 = dq ^ q
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* 0 = dp ^ p
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*/
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asm volatile("movdqa %0,%%xmm4" : : "m" (qmul[0]));
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asm volatile("movdqa %0,%%xmm5" : : "m" (qmul[16]));
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asm volatile("movdqa %xmm1,%xmm3");
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asm volatile("psraw $4,%xmm1");
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asm volatile("pand %xmm7,%xmm3");
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asm volatile("pand %xmm7,%xmm1");
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asm volatile("pshufb %xmm3,%xmm4");
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asm volatile("pshufb %xmm1,%xmm5");
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asm volatile("pxor %xmm4,%xmm5");
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asm volatile("movdqa %xmm0,%xmm2"); /* xmm2 = px */
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/* xmm5 = qx */
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asm volatile("movdqa %0,%%xmm4" : : "m" (pbmul[0]));
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asm volatile("movdqa %0,%%xmm1" : : "m" (pbmul[16]));
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asm volatile("movdqa %xmm2,%xmm3");
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asm volatile("psraw $4,%xmm2");
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asm volatile("pand %xmm7,%xmm3");
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asm volatile("pand %xmm7,%xmm2");
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asm volatile("pshufb %xmm3,%xmm4");
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asm volatile("pshufb %xmm2,%xmm1");
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asm volatile("pxor %xmm4,%xmm1");
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/* xmm1 = pbmul[px] */
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asm volatile("pxor %xmm5,%xmm1");
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/* xmm1 = db = DQ */
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asm volatile("movdqa %%xmm1,%0" : "=m" (*dq));
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asm volatile("pxor %xmm1,%xmm0");
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asm volatile("movdqa %%xmm0,%0" : "=m" (*dp));
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bytes -= 16;
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p += 16;
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q += 16;
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dp += 16;
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dq += 16;
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#endif
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}
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kernel_fpu_end();
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}
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void raid6_datap_recov_ssse3(int disks, size_t bytes, int faila, void **ptrs)
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{
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u8 *p, *q, *dq;
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const u8 *qmul; /* Q multiplier table */
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static const u8 __aligned(16) x0f[16] = {
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0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
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0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f};
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p = (u8 *)ptrs[disks-2];
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q = (u8 *)ptrs[disks-1];
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/* Compute syndrome with zero for the missing data page
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Use the dead data page as temporary storage for delta q */
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dq = (u8 *)ptrs[faila];
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ptrs[faila] = (void *)raid6_empty_zero_page;
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ptrs[disks-1] = dq;
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raid6_call.gen_syndrome(disks, bytes, ptrs);
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/* Restore pointer table */
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ptrs[faila] = dq;
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ptrs[disks-1] = q;
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/* Now, pick the proper data tables */
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qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila]]];
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kernel_fpu_begin();
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asm volatile("movdqa %0, %%xmm7" : : "m" (x0f[0]));
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||||
while (bytes) {
|
||||
#ifdef CONFIG_X86_64
|
||||
asm volatile("movdqa %0, %%xmm3" : : "m" (dq[0]));
|
||||
asm volatile("movdqa %0, %%xmm4" : : "m" (dq[16]));
|
||||
asm volatile("pxor %0, %%xmm3" : : "m" (q[0]));
|
||||
asm volatile("movdqa %0, %%xmm0" : : "m" (qmul[0]));
|
||||
|
||||
/* xmm3 = q[0] ^ dq[0] */
|
||||
|
||||
asm volatile("pxor %0, %%xmm4" : : "m" (q[16]));
|
||||
asm volatile("movdqa %0, %%xmm1" : : "m" (qmul[16]));
|
||||
|
||||
/* xmm4 = q[16] ^ dq[16] */
|
||||
|
||||
asm volatile("movdqa %xmm3, %xmm6");
|
||||
asm volatile("movdqa %xmm4, %xmm8");
|
||||
|
||||
/* xmm4 = xmm8 = q[16] ^ dq[16] */
|
||||
|
||||
asm volatile("psraw $4, %xmm3");
|
||||
asm volatile("pand %xmm7, %xmm6");
|
||||
asm volatile("pand %xmm7, %xmm3");
|
||||
asm volatile("pshufb %xmm6, %xmm0");
|
||||
asm volatile("pshufb %xmm3, %xmm1");
|
||||
asm volatile("movdqa %0, %%xmm10" : : "m" (qmul[0]));
|
||||
asm volatile("pxor %xmm0, %xmm1");
|
||||
asm volatile("movdqa %0, %%xmm11" : : "m" (qmul[16]));
|
||||
|
||||
/* xmm1 = qmul[q[0] ^ dq[0]] */
|
||||
|
||||
asm volatile("psraw $4, %xmm4");
|
||||
asm volatile("pand %xmm7, %xmm8");
|
||||
asm volatile("pand %xmm7, %xmm4");
|
||||
asm volatile("pshufb %xmm8, %xmm10");
|
||||
asm volatile("pshufb %xmm4, %xmm11");
|
||||
asm volatile("movdqa %0, %%xmm2" : : "m" (p[0]));
|
||||
asm volatile("pxor %xmm10, %xmm11");
|
||||
asm volatile("movdqa %0, %%xmm12" : : "m" (p[16]));
|
||||
|
||||
/* xmm11 = qmul[q[16] ^ dq[16]] */
|
||||
|
||||
asm volatile("pxor %xmm1, %xmm2");
|
||||
|
||||
/* xmm2 = p[0] ^ qmul[q[0] ^ dq[0]] */
|
||||
|
||||
asm volatile("pxor %xmm11, %xmm12");
|
||||
|
||||
/* xmm12 = p[16] ^ qmul[q[16] ^ dq[16]] */
|
||||
|
||||
asm volatile("movdqa %%xmm1, %0" : "=m" (dq[0]));
|
||||
asm volatile("movdqa %%xmm11, %0" : "=m" (dq[16]));
|
||||
|
||||
asm volatile("movdqa %%xmm2, %0" : "=m" (p[0]));
|
||||
asm volatile("movdqa %%xmm12, %0" : "=m" (p[16]));
|
||||
|
||||
bytes -= 32;
|
||||
p += 32;
|
||||
q += 32;
|
||||
dq += 32;
|
||||
|
||||
#else
|
||||
asm volatile("movdqa %0, %%xmm3" : : "m" (dq[0]));
|
||||
asm volatile("movdqa %0, %%xmm0" : : "m" (qmul[0]));
|
||||
asm volatile("pxor %0, %%xmm3" : : "m" (q[0]));
|
||||
asm volatile("movdqa %0, %%xmm1" : : "m" (qmul[16]));
|
||||
|
||||
/* xmm3 = *q ^ *dq */
|
||||
|
||||
asm volatile("movdqa %xmm3, %xmm6");
|
||||
asm volatile("movdqa %0, %%xmm2" : : "m" (p[0]));
|
||||
asm volatile("psraw $4, %xmm3");
|
||||
asm volatile("pand %xmm7, %xmm6");
|
||||
asm volatile("pand %xmm7, %xmm3");
|
||||
asm volatile("pshufb %xmm6, %xmm0");
|
||||
asm volatile("pshufb %xmm3, %xmm1");
|
||||
asm volatile("pxor %xmm0, %xmm1");
|
||||
|
||||
/* xmm1 = qmul[*q ^ *dq */
|
||||
|
||||
asm volatile("pxor %xmm1, %xmm2");
|
||||
|
||||
/* xmm2 = *p ^ qmul[*q ^ *dq] */
|
||||
|
||||
asm volatile("movdqa %%xmm1, %0" : "=m" (dq[0]));
|
||||
asm volatile("movdqa %%xmm2, %0" : "=m" (p[0]));
|
||||
|
||||
bytes -= 16;
|
||||
p += 16;
|
||||
q += 16;
|
||||
dq += 16;
|
||||
#endif
|
||||
}
|
||||
|
||||
kernel_fpu_end();
|
||||
}
|
||||
|
||||
const struct raid6_recov_calls raid6_recov_ssse3 = {
|
||||
.data2 = raid6_2data_recov_ssse3,
|
||||
.datap = raid6_datap_recov_ssse3,
|
||||
.valid = raid6_has_ssse3,
|
||||
#ifdef CONFIG_X86_64
|
||||
.name = "ssse3x2",
|
||||
#else
|
||||
.name = "ssse3x1",
|
||||
#endif
|
||||
.priority = 1,
|
||||
};
|
||||
|
||||
#endif
|
||||
Reference in New Issue