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    Subject[PATCH 2/4] lib/raid6: Add SSSE3 optimized recovery functions
    Date
    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>
    ---
    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..b77266f
    --- /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 __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
    +
    --
    1.7.8.5


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