Linux 2.6.34-rc3
[pohmelfs.git] / drivers / md / raid6sse1.c
blobb274dd5eab8f1a39aa3706e0d012bfeb8cef92f2
1 /* -*- linux-c -*- ------------------------------------------------------- *
3 * Copyright 2002 H. Peter Anvin - All Rights Reserved
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, Inc., 53 Temple Place Ste 330,
8 * Boston MA 02111-1307, USA; either version 2 of the License, or
9 * (at your option) any later version; incorporated herein by reference.
11 * ----------------------------------------------------------------------- */
14 * raid6sse1.c
16 * SSE-1/MMXEXT implementation of RAID-6 syndrome functions
18 * This is really an MMX implementation, but it requires SSE-1 or
19 * AMD MMXEXT for prefetch support and a few other features. The
20 * support for nontemporal memory accesses is enough to make this
21 * worthwhile as a separate implementation.
24 #if defined(__i386__) && !defined(__arch_um__)
26 #include <linux/raid/pq.h>
27 #include "raid6x86.h"
29 /* Defined in raid6mmx.c */
30 extern const struct raid6_mmx_constants {
31 u64 x1d;
32 } raid6_mmx_constants;
34 static int raid6_have_sse1_or_mmxext(void)
36 /* Not really boot_cpu but "all_cpus" */
37 return boot_cpu_has(X86_FEATURE_MMX) &&
38 (boot_cpu_has(X86_FEATURE_XMM) ||
39 boot_cpu_has(X86_FEATURE_MMXEXT));
43 * Plain SSE1 implementation
45 static void raid6_sse11_gen_syndrome(int disks, size_t bytes, void **ptrs)
47 u8 **dptr = (u8 **)ptrs;
48 u8 *p, *q;
49 int d, z, z0;
51 z0 = disks - 3; /* Highest data disk */
52 p = dptr[z0+1]; /* XOR parity */
53 q = dptr[z0+2]; /* RS syndrome */
55 kernel_fpu_begin();
57 asm volatile("movq %0,%%mm0" : : "m" (raid6_mmx_constants.x1d));
58 asm volatile("pxor %mm5,%mm5"); /* Zero temp */
60 for ( d = 0 ; d < bytes ; d += 8 ) {
61 asm volatile("prefetchnta %0" : : "m" (dptr[z0][d]));
62 asm volatile("movq %0,%%mm2" : : "m" (dptr[z0][d])); /* P[0] */
63 asm volatile("prefetchnta %0" : : "m" (dptr[z0-1][d]));
64 asm volatile("movq %mm2,%mm4"); /* Q[0] */
65 asm volatile("movq %0,%%mm6" : : "m" (dptr[z0-1][d]));
66 for ( z = z0-2 ; z >= 0 ; z-- ) {
67 asm volatile("prefetchnta %0" : : "m" (dptr[z][d]));
68 asm volatile("pcmpgtb %mm4,%mm5");
69 asm volatile("paddb %mm4,%mm4");
70 asm volatile("pand %mm0,%mm5");
71 asm volatile("pxor %mm5,%mm4");
72 asm volatile("pxor %mm5,%mm5");
73 asm volatile("pxor %mm6,%mm2");
74 asm volatile("pxor %mm6,%mm4");
75 asm volatile("movq %0,%%mm6" : : "m" (dptr[z][d]));
77 asm volatile("pcmpgtb %mm4,%mm5");
78 asm volatile("paddb %mm4,%mm4");
79 asm volatile("pand %mm0,%mm5");
80 asm volatile("pxor %mm5,%mm4");
81 asm volatile("pxor %mm5,%mm5");
82 asm volatile("pxor %mm6,%mm2");
83 asm volatile("pxor %mm6,%mm4");
85 asm volatile("movntq %%mm2,%0" : "=m" (p[d]));
86 asm volatile("movntq %%mm4,%0" : "=m" (q[d]));
89 asm volatile("sfence" : : : "memory");
90 kernel_fpu_end();
93 const struct raid6_calls raid6_sse1x1 = {
94 raid6_sse11_gen_syndrome,
95 raid6_have_sse1_or_mmxext,
96 "sse1x1",
97 1 /* Has cache hints */
101 * Unrolled-by-2 SSE1 implementation
103 static void raid6_sse12_gen_syndrome(int disks, size_t bytes, void **ptrs)
105 u8 **dptr = (u8 **)ptrs;
106 u8 *p, *q;
107 int d, z, z0;
109 z0 = disks - 3; /* Highest data disk */
110 p = dptr[z0+1]; /* XOR parity */
111 q = dptr[z0+2]; /* RS syndrome */
113 kernel_fpu_begin();
115 asm volatile("movq %0,%%mm0" : : "m" (raid6_mmx_constants.x1d));
116 asm volatile("pxor %mm5,%mm5"); /* Zero temp */
117 asm volatile("pxor %mm7,%mm7"); /* Zero temp */
119 /* We uniformly assume a single prefetch covers at least 16 bytes */
120 for ( d = 0 ; d < bytes ; d += 16 ) {
121 asm volatile("prefetchnta %0" : : "m" (dptr[z0][d]));
122 asm volatile("movq %0,%%mm2" : : "m" (dptr[z0][d])); /* P[0] */
123 asm volatile("movq %0,%%mm3" : : "m" (dptr[z0][d+8])); /* P[1] */
124 asm volatile("movq %mm2,%mm4"); /* Q[0] */
125 asm volatile("movq %mm3,%mm6"); /* Q[1] */
126 for ( z = z0-1 ; z >= 0 ; z-- ) {
127 asm volatile("prefetchnta %0" : : "m" (dptr[z][d]));
128 asm volatile("pcmpgtb %mm4,%mm5");
129 asm volatile("pcmpgtb %mm6,%mm7");
130 asm volatile("paddb %mm4,%mm4");
131 asm volatile("paddb %mm6,%mm6");
132 asm volatile("pand %mm0,%mm5");
133 asm volatile("pand %mm0,%mm7");
134 asm volatile("pxor %mm5,%mm4");
135 asm volatile("pxor %mm7,%mm6");
136 asm volatile("movq %0,%%mm5" : : "m" (dptr[z][d]));
137 asm volatile("movq %0,%%mm7" : : "m" (dptr[z][d+8]));
138 asm volatile("pxor %mm5,%mm2");
139 asm volatile("pxor %mm7,%mm3");
140 asm volatile("pxor %mm5,%mm4");
141 asm volatile("pxor %mm7,%mm6");
142 asm volatile("pxor %mm5,%mm5");
143 asm volatile("pxor %mm7,%mm7");
145 asm volatile("movntq %%mm2,%0" : "=m" (p[d]));
146 asm volatile("movntq %%mm3,%0" : "=m" (p[d+8]));
147 asm volatile("movntq %%mm4,%0" : "=m" (q[d]));
148 asm volatile("movntq %%mm6,%0" : "=m" (q[d+8]));
151 asm volatile("sfence" : :: "memory");
152 kernel_fpu_end();
155 const struct raid6_calls raid6_sse1x2 = {
156 raid6_sse12_gen_syndrome,
157 raid6_have_sse1_or_mmxext,
158 "sse1x2",
159 1 /* Has cache hints */
162 #endif