From cc4589ebfae6f8dbb5cf880a0a67eedab3416492 Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Wed, 11 Aug 2010 00:19:05 +0100 Subject: Rename raid6 files now they're in a 'raid6' directory. Linus asks 'why "raid6" twice?'. No reason. Signed-off-by: David Woodhouse --- lib/raid6/sse1.c | 162 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 162 insertions(+) create mode 100644 lib/raid6/sse1.c (limited to 'lib/raid6/sse1.c') diff --git a/lib/raid6/sse1.c b/lib/raid6/sse1.c new file mode 100644 index 000000000000..b274dd5eab8f --- /dev/null +++ b/lib/raid6/sse1.c @@ -0,0 +1,162 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright 2002 H. Peter Anvin - All Rights Reserved + * + * 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, Inc., 53 Temple Place Ste 330, + * Boston MA 02111-1307, USA; either version 2 of the License, or + * (at your option) any later version; incorporated herein by reference. + * + * ----------------------------------------------------------------------- */ + +/* + * raid6sse1.c + * + * SSE-1/MMXEXT implementation of RAID-6 syndrome functions + * + * This is really an MMX implementation, but it requires SSE-1 or + * AMD MMXEXT for prefetch support and a few other features. The + * support for nontemporal memory accesses is enough to make this + * worthwhile as a separate implementation. + */ + +#if defined(__i386__) && !defined(__arch_um__) + +#include +#include "raid6x86.h" + +/* Defined in raid6mmx.c */ +extern const struct raid6_mmx_constants { + u64 x1d; +} raid6_mmx_constants; + +static int raid6_have_sse1_or_mmxext(void) +{ + /* Not really boot_cpu but "all_cpus" */ + return boot_cpu_has(X86_FEATURE_MMX) && + (boot_cpu_has(X86_FEATURE_XMM) || + boot_cpu_has(X86_FEATURE_MMXEXT)); +} + +/* + * Plain SSE1 implementation + */ +static void raid6_sse11_gen_syndrome(int disks, size_t bytes, void **ptrs) +{ + u8 **dptr = (u8 **)ptrs; + u8 *p, *q; + int d, z, z0; + + z0 = disks - 3; /* Highest data disk */ + p = dptr[z0+1]; /* XOR parity */ + q = dptr[z0+2]; /* RS syndrome */ + + kernel_fpu_begin(); + + asm volatile("movq %0,%%mm0" : : "m" (raid6_mmx_constants.x1d)); + asm volatile("pxor %mm5,%mm5"); /* Zero temp */ + + for ( d = 0 ; d < bytes ; d += 8 ) { + asm volatile("prefetchnta %0" : : "m" (dptr[z0][d])); + asm volatile("movq %0,%%mm2" : : "m" (dptr[z0][d])); /* P[0] */ + asm volatile("prefetchnta %0" : : "m" (dptr[z0-1][d])); + asm volatile("movq %mm2,%mm4"); /* Q[0] */ + asm volatile("movq %0,%%mm6" : : "m" (dptr[z0-1][d])); + for ( z = z0-2 ; z >= 0 ; z-- ) { + asm volatile("prefetchnta %0" : : "m" (dptr[z][d])); + asm volatile("pcmpgtb %mm4,%mm5"); + asm volatile("paddb %mm4,%mm4"); + asm volatile("pand %mm0,%mm5"); + asm volatile("pxor %mm5,%mm4"); + asm volatile("pxor %mm5,%mm5"); + asm volatile("pxor %mm6,%mm2"); + asm volatile("pxor %mm6,%mm4"); + asm volatile("movq %0,%%mm6" : : "m" (dptr[z][d])); + } + asm volatile("pcmpgtb %mm4,%mm5"); + asm volatile("paddb %mm4,%mm4"); + asm volatile("pand %mm0,%mm5"); + asm volatile("pxor %mm5,%mm4"); + asm volatile("pxor %mm5,%mm5"); + asm volatile("pxor %mm6,%mm2"); + asm volatile("pxor %mm6,%mm4"); + + asm volatile("movntq %%mm2,%0" : "=m" (p[d])); + asm volatile("movntq %%mm4,%0" : "=m" (q[d])); + } + + asm volatile("sfence" : : : "memory"); + kernel_fpu_end(); +} + +const struct raid6_calls raid6_sse1x1 = { + raid6_sse11_gen_syndrome, + raid6_have_sse1_or_mmxext, + "sse1x1", + 1 /* Has cache hints */ +}; + +/* + * Unrolled-by-2 SSE1 implementation + */ +static void raid6_sse12_gen_syndrome(int disks, size_t bytes, void **ptrs) +{ + u8 **dptr = (u8 **)ptrs; + u8 *p, *q; + int d, z, z0; + + z0 = disks - 3; /* Highest data disk */ + p = dptr[z0+1]; /* XOR parity */ + q = dptr[z0+2]; /* RS syndrome */ + + kernel_fpu_begin(); + + asm volatile("movq %0,%%mm0" : : "m" (raid6_mmx_constants.x1d)); + asm volatile("pxor %mm5,%mm5"); /* Zero temp */ + asm volatile("pxor %mm7,%mm7"); /* Zero temp */ + + /* We uniformly assume a single prefetch covers at least 16 bytes */ + for ( d = 0 ; d < bytes ; d += 16 ) { + asm volatile("prefetchnta %0" : : "m" (dptr[z0][d])); + asm volatile("movq %0,%%mm2" : : "m" (dptr[z0][d])); /* P[0] */ + asm volatile("movq %0,%%mm3" : : "m" (dptr[z0][d+8])); /* P[1] */ + asm volatile("movq %mm2,%mm4"); /* Q[0] */ + asm volatile("movq %mm3,%mm6"); /* Q[1] */ + for ( z = z0-1 ; z >= 0 ; z-- ) { + asm volatile("prefetchnta %0" : : "m" (dptr[z][d])); + asm volatile("pcmpgtb %mm4,%mm5"); + asm volatile("pcmpgtb %mm6,%mm7"); + asm volatile("paddb %mm4,%mm4"); + asm volatile("paddb %mm6,%mm6"); + asm volatile("pand %mm0,%mm5"); + asm volatile("pand %mm0,%mm7"); + asm volatile("pxor %mm5,%mm4"); + asm volatile("pxor %mm7,%mm6"); + asm volatile("movq %0,%%mm5" : : "m" (dptr[z][d])); + asm volatile("movq %0,%%mm7" : : "m" (dptr[z][d+8])); + asm volatile("pxor %mm5,%mm2"); + asm volatile("pxor %mm7,%mm3"); + asm volatile("pxor %mm5,%mm4"); + asm volatile("pxor %mm7,%mm6"); + asm volatile("pxor %mm5,%mm5"); + asm volatile("pxor %mm7,%mm7"); + } + asm volatile("movntq %%mm2,%0" : "=m" (p[d])); + asm volatile("movntq %%mm3,%0" : "=m" (p[d+8])); + asm volatile("movntq %%mm4,%0" : "=m" (q[d])); + asm volatile("movntq %%mm6,%0" : "=m" (q[d+8])); + } + + asm volatile("sfence" : :: "memory"); + kernel_fpu_end(); +} + +const struct raid6_calls raid6_sse1x2 = { + raid6_sse12_gen_syndrome, + raid6_have_sse1_or_mmxext, + "sse1x2", + 1 /* Has cache hints */ +}; + +#endif -- cgit v1.2.2 From a8e026c785b3fecef0ef5c00c15223542c4db8f5 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Thu, 12 Aug 2010 06:44:54 +1000 Subject: Further tidyup of raid6 naming in lib/raid6 Rename raid6/raid6x86.h to raid6/x86.h and modify some comments. Signed-off-by: NeilBrown --- lib/raid6/sse1.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'lib/raid6/sse1.c') diff --git a/lib/raid6/sse1.c b/lib/raid6/sse1.c index b274dd5eab8f..10dd91948c07 100644 --- a/lib/raid6/sse1.c +++ b/lib/raid6/sse1.c @@ -11,7 +11,7 @@ * ----------------------------------------------------------------------- */ /* - * raid6sse1.c + * raid6/sse1.c * * SSE-1/MMXEXT implementation of RAID-6 syndrome functions * @@ -24,9 +24,9 @@ #if defined(__i386__) && !defined(__arch_um__) #include -#include "raid6x86.h" +#include "x86.h" -/* Defined in raid6mmx.c */ +/* Defined in raid6/mmx.c */ extern const struct raid6_mmx_constants { u64 x1d; } raid6_mmx_constants; -- cgit v1.2.2