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Date: Wed, 11 Apr 2012 12:40:29 -0700
From: Jim Kukunas <james.t.kukunas@...ux.intel.com>
To: linux-raid@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, neilb@...e.de, hpa@...or.com
Subject: [PATCH 2/4] 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@...or.com>
Signed-off-by: Jim Kukunas <james.t.kukunas@...ux.intel.com>
---
include/linux/raid/pq.h | 18 +++-
lib/raid6/Makefile | 2 +-
lib/raid6/algos.c | 37 +++++
lib/raid6/mktables.c | 25 ++++
lib/raid6/recov.c | 15 ++-
lib/raid6/recov_ssse3.c | 336 +++++++++++++++++++++++++++++++++++++++++++++++
6 files changed, 426 insertions(+), 7 deletions(-)
create mode 100644 lib/raid6/recov_ssse3.c
diff --git a/include/linux/raid/pq.h b/include/linux/raid/pq.h
index 53272e9..640c69c 100644
--- a/include/linux/raid/pq.h
+++ b/include/linux/raid/pq.h
@@ -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);
diff --git a/lib/raid6/Makefile b/lib/raid6/Makefile
index 8a38102..de06dfe 100644
--- a/lib/raid6/Makefile
+++ b/lib/raid6/Makefile
@@ -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
diff --git a/lib/raid6/algos.c b/lib/raid6/algos.c
index f6a0f78..5a7f802 100644
--- a/lib/raid6/algos.c
+++ b/lib/raid6/algos.c
@@ -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;
}
diff --git a/lib/raid6/mktables.c b/lib/raid6/mktables.c
index 8a37809..39787db 100644
--- a/lib/raid6/mktables.c
+++ b/lib/raid6/mktables.c
@@ -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"
diff --git a/lib/raid6/recov.c b/lib/raid6/recov.c
index fe275d7..1805a5c 100644
--- a/lib/raid6/recov.c
+++ b/lib/raid6/recov.c
@@ -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 */
diff --git a/lib/raid6/recov_ssse3.c b/lib/raid6/recov_ssse3.c
new file mode 100644
index 0000000..43eb383
--- /dev/null
+++ b/lib/raid6/recov_ssse3.c
@@ -0,0 +1,336 @@
+/*
+ * 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 __attribute__((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 __attribute__((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
+
--
1.7.8.5
--
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