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 2012-05-22 13:54:18 +10:00 committed by NeilBrown
parent f674ef7b43
commit 048a8b8c89
6 changed files with 425 additions and 7 deletions

View File

@ -99,8 +99,20 @@ extern const struct raid6_calls raid6_altivec2;
extern const struct raid6_calls raid6_altivec4;
extern const struct raid6_calls raid6_altivec8;
struct raid6_recov_calls {
void (*data2)(int, size_t, int, int, void **);
void (*datap)(int, size_t, int, void **);
int (*valid)(void);
const char *name;
int priority;
};
extern const struct raid6_recov_calls raid6_recov_intx1;
extern const struct raid6_recov_calls raid6_recov_ssse3;
/* Algorithm list */
extern const struct raid6_calls * const raid6_algos[];
extern const struct raid6_recov_calls *const raid6_recov_algos[];
int raid6_select_algo(void);
/* Return values from chk_syndrome */
@ -111,14 +123,16 @@ int raid6_select_algo(void);
/* Galois field tables */
extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
extern const u8 raid6_vgfmul[256][32] __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,
extern 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);
extern 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);

View File

@ -1,6 +1,6 @@
obj-$(CONFIG_RAID6_PQ) += raid6_pq.o
raid6_pq-y += algos.o recov.o tables.o int1.o int2.o int4.o \
raid6_pq-y += algos.o recov.o recov_ssse3.o tables.o int1.o int2.o int4.o \
int8.o int16.o int32.o altivec1.o altivec2.o altivec4.o \
altivec8.o mmx.o sse1.o sse2.o
hostprogs-y += mktables

View File

@ -64,6 +64,20 @@ const struct raid6_calls * const raid6_algos[] = {
NULL
};
void (*raid6_2data_recov)(int, size_t, int, int, void **);
EXPORT_SYMBOL_GPL(raid6_2data_recov);
void (*raid6_datap_recov)(int, size_t, int, void **);
EXPORT_SYMBOL_GPL(raid6_datap_recov);
const struct raid6_recov_calls *const raid6_recov_algos[] = {
#if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)
&raid6_recov_ssse3,
#endif
&raid6_recov_intx1,
NULL
};
#ifdef __KERNEL__
#define RAID6_TIME_JIFFIES_LG2 4
#else
@ -72,6 +86,26 @@ const struct raid6_calls * const raid6_algos[] = {
#define time_before(x, y) ((x) < (y))
#endif
static inline void raid6_choose_recov(void)
{
const struct raid6_recov_calls *const *algo;
const struct raid6_recov_calls *best;
for (best = NULL, algo = raid6_recov_algos; *algo; algo++)
if (!best || (*algo)->priority > best->priority)
if (!(*algo)->valid || (*algo)->valid())
best = *algo;
if (best) {
raid6_2data_recov = best->data2;
raid6_datap_recov = best->datap;
printk("raid6: using %s recovery algorithm\n", best->name);
} else
printk("raid6: Yikes! No recovery algorithm found!\n");
}
/* Try to pick the best algorithm */
/* This code uses the gfmul table as convenient data set to abuse */
@ -141,6 +175,9 @@ int __init raid6_select_algo(void)
free_pages((unsigned long)syndromes, 1);
/* select raid recover functions */
raid6_choose_recov();
return best ? 0 : -EINVAL;
}

View File

@ -81,6 +81,31 @@ int main(int argc, char *argv[])
printf("EXPORT_SYMBOL(raid6_gfmul);\n");
printf("#endif\n");
/* Compute vector multiplication table */
printf("\nconst u8 __attribute__((aligned(256)))\n"
"raid6_vgfmul[256][32] =\n"
"{\n");
for (i = 0; i < 256; i++) {
printf("\t{\n");
for (j = 0; j < 16; j += 8) {
printf("\t\t");
for (k = 0; k < 8; k++)
printf("0x%02x,%c", gfmul(i, j + k),
(k == 7) ? '\n' : ' ');
}
for (j = 0; j < 16; j += 8) {
printf("\t\t");
for (k = 0; k < 8; k++)
printf("0x%02x,%c", gfmul(i, (j + k) << 4),
(k == 7) ? '\n' : ' ');
}
printf("\t},\n");
}
printf("};\n");
printf("#ifdef __KERNEL__\n");
printf("EXPORT_SYMBOL(raid6_vgfmul);\n");
printf("#endif\n");
/* Compute power-of-2 table (exponent) */
v = 1;
printf("\nconst u8 __attribute__((aligned(256)))\n"

View File

@ -22,7 +22,7 @@
#include <linux/raid/pq.h>
/* Recover two failed data blocks. */
void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
void raid6_2data_recov_intx1(int disks, size_t bytes, int faila, int failb,
void **ptrs)
{
u8 *p, *q, *dp, *dq;
@ -64,10 +64,9 @@ void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
p++; q++;
}
}
EXPORT_SYMBOL_GPL(raid6_2data_recov);
/* Recover failure of one data block plus the P block */
void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs)
void raid6_datap_recov_intx1(int disks, size_t bytes, int faila, void **ptrs)
{
u8 *p, *q, *dq;
const u8 *qmul; /* Q multiplier table */
@ -96,7 +95,15 @@ void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs)
q++; dq++;
}
}
EXPORT_SYMBOL_GPL(raid6_datap_recov);
const struct raid6_recov_calls raid6_recov_intx1 = {
.data2 = raid6_2data_recov_intx1,
.datap = raid6_datap_recov_intx1,
.valid = NULL,
.name = "intx1",
.priority = 0,
};
#ifndef __KERNEL__
/* Testing only */

335
lib/raid6/recov_ssse3.c Normal file
View File

@ -0,0 +1,335 @@
/*
* Copyright (C) 2012 Intel Corporation
*
* 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; version 2
* of the License.
*/
#if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)
#include <linux/raid/pq.h>
#include "x86.h"
static int raid6_has_ssse3(void)
{
return boot_cpu_has(X86_FEATURE_XMM) &&
boot_cpu_has(X86_FEATURE_XMM2) &&
boot_cpu_has(X86_FEATURE_SSSE3);
}
void raid6_2data_recov_ssse3(int disks, size_t bytes, int faila, int failb,
void **ptrs)
{
u8 *p, *q, *dp, *dq;
const u8 *pbmul; /* P multiplier table for B data */
const u8 *qmul; /* Q multiplier table (for both) */
static const u8 __aligned(16) x0f[16] = {
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f};
p = (u8 *)ptrs[disks-2];
q = (u8 *)ptrs[disks-1];
/* Compute syndrome with zero for the missing data pages
Use the dead data pages as temporary storage for
delta p and delta q */
dp = (u8 *)ptrs[faila];
ptrs[faila] = (void *)raid6_empty_zero_page;
ptrs[disks-2] = dp;
dq = (u8 *)ptrs[failb];
ptrs[failb] = (void *)raid6_empty_zero_page;
ptrs[disks-1] = dq;
raid6_call.gen_syndrome(disks, bytes, ptrs);
/* Restore pointer table */
ptrs[faila] = dp;
ptrs[failb] = dq;
ptrs[disks-2] = p;
ptrs[disks-1] = q;
/* Now, pick the proper data tables */
pbmul = raid6_vgfmul[raid6_gfexi[failb-faila]];
qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila] ^
raid6_gfexp[failb]]];
kernel_fpu_begin();
asm volatile("movdqa %0,%%xmm7" : : "m" (x0f[0]));
#ifdef CONFIG_X86_64
asm volatile("movdqa %0,%%xmm6" : : "m" (qmul[0]));
asm volatile("movdqa %0,%%xmm14" : : "m" (pbmul[0]));
asm volatile("movdqa %0,%%xmm15" : : "m" (pbmul[16]));
#endif
/* Now do it... */
while (bytes) {
#ifdef CONFIG_X86_64
/* xmm6, xmm14, xmm15 */
asm volatile("movdqa %0,%%xmm1" : : "m" (q[0]));
asm volatile("movdqa %0,%%xmm9" : : "m" (q[16]));
asm volatile("movdqa %0,%%xmm0" : : "m" (p[0]));
asm volatile("movdqa %0,%%xmm8" : : "m" (p[16]));
asm volatile("pxor %0,%%xmm1" : : "m" (dq[0]));
asm volatile("pxor %0,%%xmm9" : : "m" (dq[16]));
asm volatile("pxor %0,%%xmm0" : : "m" (dp[0]));
asm volatile("pxor %0,%%xmm8" : : "m" (dp[16]));
/* xmm0/8 = px */
asm volatile("movdqa %xmm6,%xmm4");
asm volatile("movdqa %0,%%xmm5" : : "m" (qmul[16]));
asm volatile("movdqa %xmm6,%xmm12");
asm volatile("movdqa %xmm5,%xmm13");
asm volatile("movdqa %xmm1,%xmm3");
asm volatile("movdqa %xmm9,%xmm11");
asm volatile("movdqa %xmm0,%xmm2"); /* xmm2/10 = px */
asm volatile("movdqa %xmm8,%xmm10");
asm volatile("psraw $4,%xmm1");
asm volatile("psraw $4,%xmm9");
asm volatile("pand %xmm7,%xmm3");
asm volatile("pand %xmm7,%xmm11");
asm volatile("pand %xmm7,%xmm1");
asm volatile("pand %xmm7,%xmm9");
asm volatile("pshufb %xmm3,%xmm4");
asm volatile("pshufb %xmm11,%xmm12");
asm volatile("pshufb %xmm1,%xmm5");
asm volatile("pshufb %xmm9,%xmm13");
asm volatile("pxor %xmm4,%xmm5");
asm volatile("pxor %xmm12,%xmm13");
/* xmm5/13 = qx */
asm volatile("movdqa %xmm14,%xmm4");
asm volatile("movdqa %xmm15,%xmm1");
asm volatile("movdqa %xmm14,%xmm12");
asm volatile("movdqa %xmm15,%xmm9");
asm volatile("movdqa %xmm2,%xmm3");
asm volatile("movdqa %xmm10,%xmm11");
asm volatile("psraw $4,%xmm2");
asm volatile("psraw $4,%xmm10");
asm volatile("pand %xmm7,%xmm3");
asm volatile("pand %xmm7,%xmm11");
asm volatile("pand %xmm7,%xmm2");
asm volatile("pand %xmm7,%xmm10");
asm volatile("pshufb %xmm3,%xmm4");
asm volatile("pshufb %xmm11,%xmm12");
asm volatile("pshufb %xmm2,%xmm1");
asm volatile("pshufb %xmm10,%xmm9");
asm volatile("pxor %xmm4,%xmm1");
asm volatile("pxor %xmm12,%xmm9");
/* xmm1/9 = pbmul[px] */
asm volatile("pxor %xmm5,%xmm1");
asm volatile("pxor %xmm13,%xmm9");
/* xmm1/9 = db = DQ */
asm volatile("movdqa %%xmm1,%0" : "=m" (dq[0]));
asm volatile("movdqa %%xmm9,%0" : "=m" (dq[16]));
asm volatile("pxor %xmm1,%xmm0");
asm volatile("pxor %xmm9,%xmm8");
asm volatile("movdqa %%xmm0,%0" : "=m" (dp[0]));
asm volatile("movdqa %%xmm8,%0" : "=m" (dp[16]));
bytes -= 32;
p += 32;
q += 32;
dp += 32;
dq += 32;
#else
asm volatile("movdqa %0,%%xmm1" : : "m" (*q));
asm volatile("movdqa %0,%%xmm0" : : "m" (*p));
asm volatile("pxor %0,%%xmm1" : : "m" (*dq));
asm volatile("pxor %0,%%xmm0" : : "m" (*dp));
/* 1 = dq ^ q
* 0 = dp ^ p
*/
asm volatile("movdqa %0,%%xmm4" : : "m" (qmul[0]));
asm volatile("movdqa %0,%%xmm5" : : "m" (qmul[16]));
asm volatile("movdqa %xmm1,%xmm3");
asm volatile("psraw $4,%xmm1");
asm volatile("pand %xmm7,%xmm3");
asm volatile("pand %xmm7,%xmm1");
asm volatile("pshufb %xmm3,%xmm4");
asm volatile("pshufb %xmm1,%xmm5");
asm volatile("pxor %xmm4,%xmm5");
asm volatile("movdqa %xmm0,%xmm2"); /* xmm2 = px */
/* xmm5 = qx */
asm volatile("movdqa %0,%%xmm4" : : "m" (pbmul[0]));
asm volatile("movdqa %0,%%xmm1" : : "m" (pbmul[16]));
asm volatile("movdqa %xmm2,%xmm3");
asm volatile("psraw $4,%xmm2");
asm volatile("pand %xmm7,%xmm3");
asm volatile("pand %xmm7,%xmm2");
asm volatile("pshufb %xmm3,%xmm4");
asm volatile("pshufb %xmm2,%xmm1");
asm volatile("pxor %xmm4,%xmm1");
/* xmm1 = pbmul[px] */
asm volatile("pxor %xmm5,%xmm1");
/* xmm1 = db = DQ */
asm volatile("movdqa %%xmm1,%0" : "=m" (*dq));
asm volatile("pxor %xmm1,%xmm0");
asm volatile("movdqa %%xmm0,%0" : "=m" (*dp));
bytes -= 16;
p += 16;
q += 16;
dp += 16;
dq += 16;
#endif
}
kernel_fpu_end();
}
void raid6_datap_recov_ssse3(int disks, size_t bytes, int faila, void **ptrs)
{
u8 *p, *q, *dq;
const u8 *qmul; /* Q multiplier table */
static const u8 __aligned(16) x0f[16] = {
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f};
p = (u8 *)ptrs[disks-2];
q = (u8 *)ptrs[disks-1];
/* Compute syndrome with zero for the missing data page
Use the dead data page as temporary storage for delta q */
dq = (u8 *)ptrs[faila];
ptrs[faila] = (void *)raid6_empty_zero_page;
ptrs[disks-1] = dq;
raid6_call.gen_syndrome(disks, bytes, ptrs);
/* Restore pointer table */
ptrs[faila] = dq;
ptrs[disks-1] = q;
/* Now, pick the proper data tables */
qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila]]];
kernel_fpu_begin();
asm volatile("movdqa %0, %%xmm7" : : "m" (x0f[0]));
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