1 /* -*- linux-c -*- ------------------------------------------------------- *
2 *
3 * Copyright 2002 H. Peter Anvin - All Rights Reserved
4 *
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.
10 *
11 * ----------------------------------------------------------------------- */
12
13 /*
14 * raid6sse2.c
15 *
16 * SSE-2 implementation of RAID-6 syndrome functions
17 *
18 */
19
20 #if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)
21
22 #include <linux/raid/pq.h>
23 #include "raid6x86.h"
24
25 static const struct raid6_sse_constants {
26 u64 x1d[2];
27 } raid6_sse_constants __attribute__((aligned(16))) = {
28 { 0x1d1d1d1d1d1d1d1dULL, 0x1d1d1d1d1d1d1d1dULL },
29 };
30
31 static int raid6_have_sse2(void)
32 {
33 /* Not really boot_cpu but "all_cpus" */
34 return boot_cpu_has(X86_FEATURE_MMX) &&
35 boot_cpu_has(X86_FEATURE_FXSR) &&
36 boot_cpu_has(X86_FEATURE_XMM) &&
37 boot_cpu_has(X86_FEATURE_XMM2);
38 }
39
40 /*
41 * Plain SSE2 implementation
42 */
43 static void raid6_sse21_gen_syndrome(int disks, size_t bytes, void **ptrs)
44 {
45 u8 **dptr = (u8 **)ptrs;
46 u8 *p, *q;
47 int d, z, z0;
48
49 z0 = disks - 3; /* Highest data disk */
50 p = dptr[z0+1]; /* XOR parity */
51 q = dptr[z0+2]; /* RS syndrome */
52
53 kernel_fpu_begin();
54
55 asm volatile("movdqa %0,%%xmm0" : : "m" (raid6_sse_constants.x1d[0]));
56 asm volatile("pxor %xmm5,%xmm5"); /* Zero temp */
57
58 for ( d = 0 ; d < bytes ; d += 16 ) {
59 asm volatile("prefetchnta %0" : : "m" (dptr[z0][d]));
60 asm volatile("movdqa %0,%%xmm2" : : "m" (dptr[z0][d])); /* P[0] */
61 asm volatile("prefetchnta %0" : : "m" (dptr[z0-1][d]));
62 asm volatile("movdqa %xmm2,%xmm4"); /* Q[0] */
63 asm volatile("movdqa %0,%%xmm6" : : "m" (dptr[z0-1][d]));
64 for ( z = z0-2 ; z >= 0 ; z-- ) {
65 asm volatile("prefetchnta %0" : : "m" (dptr[z][d]));
66 asm volatile("pcmpgtb %xmm4,%xmm5");
67 asm volatile("paddb %xmm4,%xmm4");
68 asm volatile("pand %xmm0,%xmm5");
69 asm volatile("pxor %xmm5,%xmm4");
70 asm volatile("pxor %xmm5,%xmm5");
71 asm volatile("pxor %xmm6,%xmm2");
72 asm volatile("pxor %xmm6,%xmm4");
73 asm volatile("movdqa %0,%%xmm6" : : "m" (dptr[z][d]));
74 }
75 asm volatile("pcmpgtb %xmm4,%xmm5");
76 asm volatile("paddb %xmm4,%xmm4");
77 asm volatile("pand %xmm0,%xmm5");
78 asm volatile("pxor %xmm5,%xmm4");
79 asm volatile("pxor %xmm5,%xmm5");
80 asm volatile("pxor %xmm6,%xmm2");
81 asm volatile("pxor %xmm6,%xmm4");
82
83 asm volatile("movntdq %%xmm2,%0" : "=m" (p[d]));
84 asm volatile("pxor %xmm2,%xmm2");
85 asm volatile("movntdq %%xmm4,%0" : "=m" (q[d]));
86 asm volatile("pxor %xmm4,%xmm4");
87 }
88
89 asm volatile("sfence" : : : "memory");
90 kernel_fpu_end();
91 }
92
93 const struct raid6_calls raid6_sse2x1 = {
94 raid6_sse21_gen_syndrome,
95 raid6_have_sse2,
96 "sse2x1",
97 1 /* Has cache hints */
98 };
99
100 /*
101 * Unrolled-by-2 SSE2 implementation
102 */
103 static void raid6_sse22_gen_syndrome(int disks, size_t bytes, void **ptrs)
104 {
105 u8 **dptr = (u8 **)ptrs;
106 u8 *p, *q;
107 int d, z, z0;
108
109 z0 = disks - 3; /* Highest data disk */
110 p = dptr[z0+1]; /* XOR parity */
111 q = dptr[z0+2]; /* RS syndrome */
112
113 kernel_fpu_begin();
114
115 asm volatile("movdqa %0,%%xmm0" : : "m" (raid6_sse_constants.x1d[0]));
116 asm volatile("pxor %xmm5,%xmm5"); /* Zero temp */
117 asm volatile("pxor %xmm7,%xmm7"); /* Zero temp */
118
119 /* We uniformly assume a single prefetch covers at least 32 bytes */
120 for ( d = 0 ; d < bytes ; d += 32 ) {
121 asm volatile("prefetchnta %0" : : "m" (dptr[z0][d]));
122 asm volatile("movdqa %0,%%xmm2" : : "m" (dptr[z0][d])); /* P[0] */
123 asm volatile("movdqa %0,%%xmm3" : : "m" (dptr[z0][d+16])); /* P[1] */
124 asm volatile("movdqa %xmm2,%xmm4"); /* Q[0] */
125 asm volatile("movdqa %xmm3,%xmm6"); /* Q[1] */
126 for ( z = z0-1 ; z >= 0 ; z-- ) {
127 asm volatile("prefetchnta %0" : : "m" (dptr[z][d]));
128 asm volatile("pcmpgtb %xmm4,%xmm5");
129 asm volatile("pcmpgtb %xmm6,%xmm7");
130 asm volatile("paddb %xmm4,%xmm4");
131 asm volatile("paddb %xmm6,%xmm6");
132 asm volatile("pand %xmm0,%xmm5");
133 asm volatile("pand %xmm0,%xmm7");
134 asm volatile("pxor %xmm5,%xmm4");
135 asm volatile("pxor %xmm7,%xmm6");
136 asm volatile("movdqa %0,%%xmm5" : : "m" (dptr[z][d]));
137 asm volatile("movdqa %0,%%xmm7" : : "m" (dptr[z][d+16]));
138 asm volatile("pxor %xmm5,%xmm2");
139 asm volatile("pxor %xmm7,%xmm3");
140 asm volatile("pxor %xmm5,%xmm4");
141 asm volatile("pxor %xmm7,%xmm6");
142 asm volatile("pxor %xmm5,%xmm5");
143 asm volatile("pxor %xmm7,%xmm7");
144 }
145 asm volatile("movntdq %%xmm2,%0" : "=m" (p[d]));
146 asm volatile("movntdq %%xmm3,%0" : "=m" (p[d+16]));
147 asm volatile("movntdq %%xmm4,%0" : "=m" (q[d]));
148 asm volatile("movntdq %%xmm6,%0" : "=m" (q[d+16]));
149 }
150
151 asm volatile("sfence" : : : "memory");
152 kernel_fpu_end();
153 }
154
155 const struct raid6_calls raid6_sse2x2 = {
156 raid6_sse22_gen_syndrome,
157 raid6_have_sse2,
158 "sse2x2",
159 1 /* Has cache hints */
160 };
161
162 #endif
163
164 #if defined(__x86_64__) && !defined(__arch_um__)
165
166 /*
167 * Unrolled-by-4 SSE2 implementation
168 */
169 static void raid6_sse24_gen_syndrome(int disks, size_t bytes, void **ptrs)
170 {
171 u8 **dptr = (u8 **)ptrs;
172 u8 *p, *q;
173 int d, z, z0;
174
175 z0 = disks - 3; /* Highest data disk */
176 p = dptr[z0+1]; /* XOR parity */
177 q = dptr[z0+2]; /* RS syndrome */
178
179 kernel_fpu_begin();
180
181 asm volatile("movdqa %0,%%xmm0" :: "m" (raid6_sse_constants.x1d[0]));
182 asm volatile("pxor %xmm2,%xmm2"); /* P[0] */
183 asm volatile("pxor %xmm3,%xmm3"); /* P[1] */
184 asm volatile("pxor %xmm4,%xmm4"); /* Q[0] */
185 asm volatile("pxor %xmm5,%xmm5"); /* Zero temp */
186 asm volatile("pxor %xmm6,%xmm6"); /* Q[1] */
187 asm volatile("pxor %xmm7,%xmm7"); /* Zero temp */
188 asm volatile("pxor %xmm10,%xmm10"); /* P[2] */
189 asm volatile("pxor %xmm11,%xmm11"); /* P[3] */
190 asm volatile("pxor %xmm12,%xmm12"); /* Q[2] */
191 asm volatile("pxor %xmm13,%xmm13"); /* Zero temp */
192 asm volatile("pxor %xmm14,%xmm14"); /* Q[3] */
193 asm volatile("pxor %xmm15,%xmm15"); /* Zero temp */
194
195 for ( d = 0 ; d < bytes ; d += 64 ) {
196 for ( z = z0 ; z >= 0 ; z-- ) {
197 /* The second prefetch seems to improve performance... */
198 asm volatile("prefetchnta %0" :: "m" (dptr[z][d]));
199 asm volatile("prefetchnta %0" :: "m" (dptr[z][d+32]));
200 asm volatile("pcmpgtb %xmm4,%xmm5");
201 asm volatile("pcmpgtb %xmm6,%xmm7");
202 asm volatile("pcmpgtb %xmm12,%xmm13");
203 asm volatile("pcmpgtb %xmm14,%xmm15");
204 asm volatile("paddb %xmm4,%xmm4");
205 asm volatile("paddb %xmm6,%xmm6");
206 asm volatile("paddb %xmm12,%xmm12");
207 asm volatile("paddb %xmm14,%xmm14");
208 asm volatile("pand %xmm0,%xmm5");
209 asm volatile("pand %xmm0,%xmm7");
210 asm volatile("pand %xmm0,%xmm13");
211 asm volatile("pand %xmm0,%xmm15");
212 asm volatile("pxor %xmm5,%xmm4");
213 asm volatile("pxor %xmm7,%xmm6");
214 asm volatile("pxor %xmm13,%xmm12");
215 asm volatile("pxor %xmm15,%xmm14");
216 asm volatile("movdqa %0,%%xmm5" :: "m" (dptr[z][d]));
217 asm volatile("movdqa %0,%%xmm7" :: "m" (dptr[z][d+16]));
218 asm volatile("movdqa %0,%%xmm13" :: "m" (dptr[z][d+32]));
219 asm volatile("movdqa %0,%%xmm15" :: "m" (dptr[z][d+48]));
220 asm volatile("pxor %xmm5,%xmm2");
221 asm volatile("pxor %xmm7,%xmm3");
222 asm volatile("pxor %xmm13,%xmm10");
223 asm volatile("pxor %xmm15,%xmm11");
224 asm volatile("pxor %xmm5,%xmm4");
225 asm volatile("pxor %xmm7,%xmm6");
226 asm volatile("pxor %xmm13,%xmm12");
227 asm volatile("pxor %xmm15,%xmm14");
228 asm volatile("pxor %xmm5,%xmm5");
229 asm volatile("pxor %xmm7,%xmm7");
230 asm volatile("pxor %xmm13,%xmm13");
231 asm volatile("pxor %xmm15,%xmm15");
232 }
233 asm volatile("movntdq %%xmm2,%0" : "=m" (p[d]));
234 asm volatile("pxor %xmm2,%xmm2");
235 asm volatile("movntdq %%xmm3,%0" : "=m" (p[d+16]));
236 asm volatile("pxor %xmm3,%xmm3");
237 asm volatile("movntdq %%xmm10,%0" : "=m" (p[d+32]));
238 asm volatile("pxor %xmm10,%xmm10");
239 asm volatile("movntdq %%xmm11,%0" : "=m" (p[d+48]));
240 asm volatile("pxor %xmm11,%xmm11");
241 asm volatile("movntdq %%xmm4,%0" : "=m" (q[d]));
242 asm volatile("pxor %xmm4,%xmm4");
243 asm volatile("movntdq %%xmm6,%0" : "=m" (q[d+16]));
244 asm volatile("pxor %xmm6,%xmm6");
245 asm volatile("movntdq %%xmm12,%0" : "=m" (q[d+32]));
246 asm volatile("pxor %xmm12,%xmm12");
247 asm volatile("movntdq %%xmm14,%0" : "=m" (q[d+48]));
248 asm volatile("pxor %xmm14,%xmm14");
249 }
250
251 asm volatile("sfence" : : : "memory");
252 kernel_fpu_end();
253 }
254
255 const struct raid6_calls raid6_sse2x4 = {
256 raid6_sse24_gen_syndrome,
257 raid6_have_sse2,
258 "sse2x4",
259 1 /* Has cache hints */
260 };
261
262 #endif
263
|
This page was automatically generated by the
LXR engine.
|