From: Jim Kukunas Date: Tue, 22 May 2012 03:54:18 +0000 (+1000) Subject: lib/raid6: Add SSSE3 optimized recovery functions X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=048a8b8c89dc427dd7a58527c8923224b1e66d83;p=linux-beck.git 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 Signed-off-by: Jim Kukunas Signed-off-by: NeilBrown --- diff --git a/include/linux/raid/pq.h b/include/linux/raid/pq.h index 53272e9860a7..640c69ceec96 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 8a38102770f3..de06dfe165b8 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 f6a0f7899163..5a7f8022be13 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 8a3780902cec..39787db588b0 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 fe275d7b6b36..1805a5cc5daa 100644 --- a/lib/raid6/recov.c +++ b/lib/raid6/recov.c @@ -22,7 +22,7 @@ #include /* 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 000000000000..37ae61930559 --- /dev/null +++ b/lib/raid6/recov_ssse3.c @@ -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 +#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