Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 | /* -*- 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. * * ----------------------------------------------------------------------- */ /* * raid6/sse1.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 "x86.h" /* Defined in raid6/mmx.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 |