1 /*
2 * Copyright (C) 2012 Intel Corporation
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; version 2
7 * of the License.
8 */
9
10 #ifdef CONFIG_AS_SSSE3
11
12 #include <linux/raid/pq.h>
13 #include "x86.h"
14
raid6_has_ssse3(void)15 static int raid6_has_ssse3(void)
16 {
17 return boot_cpu_has(X86_FEATURE_XMM) &&
18 boot_cpu_has(X86_FEATURE_XMM2) &&
19 boot_cpu_has(X86_FEATURE_SSSE3);
20 }
21
raid6_2data_recov_ssse3(int disks,size_t bytes,int faila,int failb,void ** ptrs)22 static void raid6_2data_recov_ssse3(int disks, size_t bytes, int faila,
23 int failb, void **ptrs)
24 {
25 u8 *p, *q, *dp, *dq;
26 const u8 *pbmul; /* P multiplier table for B data */
27 const u8 *qmul; /* Q multiplier table (for both) */
28 static const u8 __aligned(16) x0f[16] = {
29 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
30 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f};
31
32 p = (u8 *)ptrs[disks-2];
33 q = (u8 *)ptrs[disks-1];
34
35 /* Compute syndrome with zero for the missing data pages
36 Use the dead data pages as temporary storage for
37 delta p and delta q */
38 dp = (u8 *)ptrs[faila];
39 ptrs[faila] = (void *)raid6_empty_zero_page;
40 ptrs[disks-2] = dp;
41 dq = (u8 *)ptrs[failb];
42 ptrs[failb] = (void *)raid6_empty_zero_page;
43 ptrs[disks-1] = dq;
44
45 raid6_call.gen_syndrome(disks, bytes, ptrs);
46
47 /* Restore pointer table */
48 ptrs[faila] = dp;
49 ptrs[failb] = dq;
50 ptrs[disks-2] = p;
51 ptrs[disks-1] = q;
52
53 /* Now, pick the proper data tables */
54 pbmul = raid6_vgfmul[raid6_gfexi[failb-faila]];
55 qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila] ^
56 raid6_gfexp[failb]]];
57
58 kernel_fpu_begin();
59
60 asm volatile("movdqa %0,%%xmm7" : : "m" (x0f[0]));
61
62 #ifdef CONFIG_X86_64
63 asm volatile("movdqa %0,%%xmm6" : : "m" (qmul[0]));
64 asm volatile("movdqa %0,%%xmm14" : : "m" (pbmul[0]));
65 asm volatile("movdqa %0,%%xmm15" : : "m" (pbmul[16]));
66 #endif
67
68 /* Now do it... */
69 while (bytes) {
70 #ifdef CONFIG_X86_64
71 /* xmm6, xmm14, xmm15 */
72
73 asm volatile("movdqa %0,%%xmm1" : : "m" (q[0]));
74 asm volatile("movdqa %0,%%xmm9" : : "m" (q[16]));
75 asm volatile("movdqa %0,%%xmm0" : : "m" (p[0]));
76 asm volatile("movdqa %0,%%xmm8" : : "m" (p[16]));
77 asm volatile("pxor %0,%%xmm1" : : "m" (dq[0]));
78 asm volatile("pxor %0,%%xmm9" : : "m" (dq[16]));
79 asm volatile("pxor %0,%%xmm0" : : "m" (dp[0]));
80 asm volatile("pxor %0,%%xmm8" : : "m" (dp[16]));
81
82 /* xmm0/8 = px */
83
84 asm volatile("movdqa %xmm6,%xmm4");
85 asm volatile("movdqa %0,%%xmm5" : : "m" (qmul[16]));
86 asm volatile("movdqa %xmm6,%xmm12");
87 asm volatile("movdqa %xmm5,%xmm13");
88 asm volatile("movdqa %xmm1,%xmm3");
89 asm volatile("movdqa %xmm9,%xmm11");
90 asm volatile("movdqa %xmm0,%xmm2"); /* xmm2/10 = px */
91 asm volatile("movdqa %xmm8,%xmm10");
92 asm volatile("psraw $4,%xmm1");
93 asm volatile("psraw $4,%xmm9");
94 asm volatile("pand %xmm7,%xmm3");
95 asm volatile("pand %xmm7,%xmm11");
96 asm volatile("pand %xmm7,%xmm1");
97 asm volatile("pand %xmm7,%xmm9");
98 asm volatile("pshufb %xmm3,%xmm4");
99 asm volatile("pshufb %xmm11,%xmm12");
100 asm volatile("pshufb %xmm1,%xmm5");
101 asm volatile("pshufb %xmm9,%xmm13");
102 asm volatile("pxor %xmm4,%xmm5");
103 asm volatile("pxor %xmm12,%xmm13");
104
105 /* xmm5/13 = qx */
106
107 asm volatile("movdqa %xmm14,%xmm4");
108 asm volatile("movdqa %xmm15,%xmm1");
109 asm volatile("movdqa %xmm14,%xmm12");
110 asm volatile("movdqa %xmm15,%xmm9");
111 asm volatile("movdqa %xmm2,%xmm3");
112 asm volatile("movdqa %xmm10,%xmm11");
113 asm volatile("psraw $4,%xmm2");
114 asm volatile("psraw $4,%xmm10");
115 asm volatile("pand %xmm7,%xmm3");
116 asm volatile("pand %xmm7,%xmm11");
117 asm volatile("pand %xmm7,%xmm2");
118 asm volatile("pand %xmm7,%xmm10");
119 asm volatile("pshufb %xmm3,%xmm4");
120 asm volatile("pshufb %xmm11,%xmm12");
121 asm volatile("pshufb %xmm2,%xmm1");
122 asm volatile("pshufb %xmm10,%xmm9");
123 asm volatile("pxor %xmm4,%xmm1");
124 asm volatile("pxor %xmm12,%xmm9");
125
126 /* xmm1/9 = pbmul[px] */
127 asm volatile("pxor %xmm5,%xmm1");
128 asm volatile("pxor %xmm13,%xmm9");
129 /* xmm1/9 = db = DQ */
130 asm volatile("movdqa %%xmm1,%0" : "=m" (dq[0]));
131 asm volatile("movdqa %%xmm9,%0" : "=m" (dq[16]));
132
133 asm volatile("pxor %xmm1,%xmm0");
134 asm volatile("pxor %xmm9,%xmm8");
135 asm volatile("movdqa %%xmm0,%0" : "=m" (dp[0]));
136 asm volatile("movdqa %%xmm8,%0" : "=m" (dp[16]));
137
138 bytes -= 32;
139 p += 32;
140 q += 32;
141 dp += 32;
142 dq += 32;
143 #else
144 asm volatile("movdqa %0,%%xmm1" : : "m" (*q));
145 asm volatile("movdqa %0,%%xmm0" : : "m" (*p));
146 asm volatile("pxor %0,%%xmm1" : : "m" (*dq));
147 asm volatile("pxor %0,%%xmm0" : : "m" (*dp));
148
149 /* 1 = dq ^ q
150 * 0 = dp ^ p
151 */
152 asm volatile("movdqa %0,%%xmm4" : : "m" (qmul[0]));
153 asm volatile("movdqa %0,%%xmm5" : : "m" (qmul[16]));
154
155 asm volatile("movdqa %xmm1,%xmm3");
156 asm volatile("psraw $4,%xmm1");
157 asm volatile("pand %xmm7,%xmm3");
158 asm volatile("pand %xmm7,%xmm1");
159 asm volatile("pshufb %xmm3,%xmm4");
160 asm volatile("pshufb %xmm1,%xmm5");
161 asm volatile("pxor %xmm4,%xmm5");
162
163 asm volatile("movdqa %xmm0,%xmm2"); /* xmm2 = px */
164
165 /* xmm5 = qx */
166
167 asm volatile("movdqa %0,%%xmm4" : : "m" (pbmul[0]));
168 asm volatile("movdqa %0,%%xmm1" : : "m" (pbmul[16]));
169 asm volatile("movdqa %xmm2,%xmm3");
170 asm volatile("psraw $4,%xmm2");
171 asm volatile("pand %xmm7,%xmm3");
172 asm volatile("pand %xmm7,%xmm2");
173 asm volatile("pshufb %xmm3,%xmm4");
174 asm volatile("pshufb %xmm2,%xmm1");
175 asm volatile("pxor %xmm4,%xmm1");
176
177 /* xmm1 = pbmul[px] */
178 asm volatile("pxor %xmm5,%xmm1");
179 /* xmm1 = db = DQ */
180 asm volatile("movdqa %%xmm1,%0" : "=m" (*dq));
181
182 asm volatile("pxor %xmm1,%xmm0");
183 asm volatile("movdqa %%xmm0,%0" : "=m" (*dp));
184
185 bytes -= 16;
186 p += 16;
187 q += 16;
188 dp += 16;
189 dq += 16;
190 #endif
191 }
192
193 kernel_fpu_end();
194 }
195
196
raid6_datap_recov_ssse3(int disks,size_t bytes,int faila,void ** ptrs)197 static void raid6_datap_recov_ssse3(int disks, size_t bytes, int faila,
198 void **ptrs)
199 {
200 u8 *p, *q, *dq;
201 const u8 *qmul; /* Q multiplier table */
202 static const u8 __aligned(16) x0f[16] = {
203 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
204 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f};
205
206 p = (u8 *)ptrs[disks-2];
207 q = (u8 *)ptrs[disks-1];
208
209 /* Compute syndrome with zero for the missing data page
210 Use the dead data page as temporary storage for delta q */
211 dq = (u8 *)ptrs[faila];
212 ptrs[faila] = (void *)raid6_empty_zero_page;
213 ptrs[disks-1] = dq;
214
215 raid6_call.gen_syndrome(disks, bytes, ptrs);
216
217 /* Restore pointer table */
218 ptrs[faila] = dq;
219 ptrs[disks-1] = q;
220
221 /* Now, pick the proper data tables */
222 qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila]]];
223
224 kernel_fpu_begin();
225
226 asm volatile("movdqa %0, %%xmm7" : : "m" (x0f[0]));
227
228 while (bytes) {
229 #ifdef CONFIG_X86_64
230 asm volatile("movdqa %0, %%xmm3" : : "m" (dq[0]));
231 asm volatile("movdqa %0, %%xmm4" : : "m" (dq[16]));
232 asm volatile("pxor %0, %%xmm3" : : "m" (q[0]));
233 asm volatile("movdqa %0, %%xmm0" : : "m" (qmul[0]));
234
235 /* xmm3 = q[0] ^ dq[0] */
236
237 asm volatile("pxor %0, %%xmm4" : : "m" (q[16]));
238 asm volatile("movdqa %0, %%xmm1" : : "m" (qmul[16]));
239
240 /* xmm4 = q[16] ^ dq[16] */
241
242 asm volatile("movdqa %xmm3, %xmm6");
243 asm volatile("movdqa %xmm4, %xmm8");
244
245 /* xmm4 = xmm8 = q[16] ^ dq[16] */
246
247 asm volatile("psraw $4, %xmm3");
248 asm volatile("pand %xmm7, %xmm6");
249 asm volatile("pand %xmm7, %xmm3");
250 asm volatile("pshufb %xmm6, %xmm0");
251 asm volatile("pshufb %xmm3, %xmm1");
252 asm volatile("movdqa %0, %%xmm10" : : "m" (qmul[0]));
253 asm volatile("pxor %xmm0, %xmm1");
254 asm volatile("movdqa %0, %%xmm11" : : "m" (qmul[16]));
255
256 /* xmm1 = qmul[q[0] ^ dq[0]] */
257
258 asm volatile("psraw $4, %xmm4");
259 asm volatile("pand %xmm7, %xmm8");
260 asm volatile("pand %xmm7, %xmm4");
261 asm volatile("pshufb %xmm8, %xmm10");
262 asm volatile("pshufb %xmm4, %xmm11");
263 asm volatile("movdqa %0, %%xmm2" : : "m" (p[0]));
264 asm volatile("pxor %xmm10, %xmm11");
265 asm volatile("movdqa %0, %%xmm12" : : "m" (p[16]));
266
267 /* xmm11 = qmul[q[16] ^ dq[16]] */
268
269 asm volatile("pxor %xmm1, %xmm2");
270
271 /* xmm2 = p[0] ^ qmul[q[0] ^ dq[0]] */
272
273 asm volatile("pxor %xmm11, %xmm12");
274
275 /* xmm12 = p[16] ^ qmul[q[16] ^ dq[16]] */
276
277 asm volatile("movdqa %%xmm1, %0" : "=m" (dq[0]));
278 asm volatile("movdqa %%xmm11, %0" : "=m" (dq[16]));
279
280 asm volatile("movdqa %%xmm2, %0" : "=m" (p[0]));
281 asm volatile("movdqa %%xmm12, %0" : "=m" (p[16]));
282
283 bytes -= 32;
284 p += 32;
285 q += 32;
286 dq += 32;
287
288 #else
289 asm volatile("movdqa %0, %%xmm3" : : "m" (dq[0]));
290 asm volatile("movdqa %0, %%xmm0" : : "m" (qmul[0]));
291 asm volatile("pxor %0, %%xmm3" : : "m" (q[0]));
292 asm volatile("movdqa %0, %%xmm1" : : "m" (qmul[16]));
293
294 /* xmm3 = *q ^ *dq */
295
296 asm volatile("movdqa %xmm3, %xmm6");
297 asm volatile("movdqa %0, %%xmm2" : : "m" (p[0]));
298 asm volatile("psraw $4, %xmm3");
299 asm volatile("pand %xmm7, %xmm6");
300 asm volatile("pand %xmm7, %xmm3");
301 asm volatile("pshufb %xmm6, %xmm0");
302 asm volatile("pshufb %xmm3, %xmm1");
303 asm volatile("pxor %xmm0, %xmm1");
304
305 /* xmm1 = qmul[*q ^ *dq */
306
307 asm volatile("pxor %xmm1, %xmm2");
308
309 /* xmm2 = *p ^ qmul[*q ^ *dq] */
310
311 asm volatile("movdqa %%xmm1, %0" : "=m" (dq[0]));
312 asm volatile("movdqa %%xmm2, %0" : "=m" (p[0]));
313
314 bytes -= 16;
315 p += 16;
316 q += 16;
317 dq += 16;
318 #endif
319 }
320
321 kernel_fpu_end();
322 }
323
324 const struct raid6_recov_calls raid6_recov_ssse3 = {
325 .data2 = raid6_2data_recov_ssse3,
326 .datap = raid6_datap_recov_ssse3,
327 .valid = raid6_has_ssse3,
328 #ifdef CONFIG_X86_64
329 .name = "ssse3x2",
330 #else
331 .name = "ssse3x1",
332 #endif
333 .priority = 1,
334 };
335
336 #else
337 #warning "your version of binutils lacks SSSE3 support"
338 #endif
339