/* -*- 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 <linux/raid/pq.h> #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