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TOMOYO Linux Cross Reference
Linux/lib/raid6/recov_avx2.c

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  1 /*
  2  * Copyright (C) 2012 Intel Corporation
  3  * Author: Jim Kukunas <james.t.kukunas@linux.intel.com>
  4  *
  5  * This program is free software; you can redistribute it and/or
  6  * modify it under the terms of the GNU General Public License
  7  * as published by the Free Software Foundation; version 2
  8  * of the License.
  9  */
 10 
 11 #ifdef CONFIG_AS_AVX2
 12 
 13 #include <linux/raid/pq.h>
 14 #include "x86.h"
 15 
 16 static int raid6_has_avx2(void)
 17 {
 18         return boot_cpu_has(X86_FEATURE_AVX2) &&
 19                 boot_cpu_has(X86_FEATURE_AVX);
 20 }
 21 
 22 static void raid6_2data_recov_avx2(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         const u8 x0f = 0x0f;
 29 
 30         p = (u8 *)ptrs[disks-2];
 31         q = (u8 *)ptrs[disks-1];
 32 
 33         /* Compute syndrome with zero for the missing data pages
 34            Use the dead data pages as temporary storage for
 35            delta p and delta q */
 36         dp = (u8 *)ptrs[faila];
 37         ptrs[faila] = (void *)raid6_empty_zero_page;
 38         ptrs[disks-2] = dp;
 39         dq = (u8 *)ptrs[failb];
 40         ptrs[failb] = (void *)raid6_empty_zero_page;
 41         ptrs[disks-1] = dq;
 42 
 43         raid6_call.gen_syndrome(disks, bytes, ptrs);
 44 
 45         /* Restore pointer table */
 46         ptrs[faila]   = dp;
 47         ptrs[failb]   = dq;
 48         ptrs[disks-2] = p;
 49         ptrs[disks-1] = q;
 50 
 51         /* Now, pick the proper data tables */
 52         pbmul = raid6_vgfmul[raid6_gfexi[failb-faila]];
 53         qmul  = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila] ^
 54                 raid6_gfexp[failb]]];
 55 
 56         kernel_fpu_begin();
 57 
 58         /* ymm0 = x0f[16] */
 59         asm volatile("vpbroadcastb %0, %%ymm7" : : "m" (x0f));
 60 
 61         while (bytes) {
 62 #ifdef CONFIG_X86_64
 63                 asm volatile("vmovdqa %0, %%ymm1" : : "m" (q[0]));
 64                 asm volatile("vmovdqa %0, %%ymm9" : : "m" (q[32]));
 65                 asm volatile("vmovdqa %0, %%ymm0" : : "m" (p[0]));
 66                 asm volatile("vmovdqa %0, %%ymm8" : : "m" (p[32]));
 67                 asm volatile("vpxor %0, %%ymm1, %%ymm1" : : "m" (dq[0]));
 68                 asm volatile("vpxor %0, %%ymm9, %%ymm9" : : "m" (dq[32]));
 69                 asm volatile("vpxor %0, %%ymm0, %%ymm0" : : "m" (dp[0]));
 70                 asm volatile("vpxor %0, %%ymm8, %%ymm8" : : "m" (dp[32]));
 71 
 72                 /*
 73                  * 1 = dq[0]  ^ q[0]
 74                  * 9 = dq[32] ^ q[32]
 75                  * 0 = dp[0]  ^ p[0]
 76                  * 8 = dp[32] ^ p[32]
 77                  */
 78 
 79                 asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (qmul[0]));
 80                 asm volatile("vbroadcasti128 %0, %%ymm5" : : "m" (qmul[16]));
 81 
 82                 asm volatile("vpsraw $4, %ymm1, %ymm3");
 83                 asm volatile("vpsraw $4, %ymm9, %ymm12");
 84                 asm volatile("vpand %ymm7, %ymm1, %ymm1");
 85                 asm volatile("vpand %ymm7, %ymm9, %ymm9");
 86                 asm volatile("vpand %ymm7, %ymm3, %ymm3");
 87                 asm volatile("vpand %ymm7, %ymm12, %ymm12");
 88                 asm volatile("vpshufb %ymm9, %ymm4, %ymm14");
 89                 asm volatile("vpshufb %ymm1, %ymm4, %ymm4");
 90                 asm volatile("vpshufb %ymm12, %ymm5, %ymm15");
 91                 asm volatile("vpshufb %ymm3, %ymm5, %ymm5");
 92                 asm volatile("vpxor %ymm14, %ymm15, %ymm15");
 93                 asm volatile("vpxor %ymm4, %ymm5, %ymm5");
 94 
 95                 /*
 96                  * 5 = qx[0]
 97                  * 15 = qx[32]
 98                  */
 99 
100                 asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (pbmul[0]));
101                 asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (pbmul[16]));
102                 asm volatile("vpsraw $4, %ymm0, %ymm2");
103                 asm volatile("vpsraw $4, %ymm8, %ymm6");
104                 asm volatile("vpand %ymm7, %ymm0, %ymm3");
105                 asm volatile("vpand %ymm7, %ymm8, %ymm14");
106                 asm volatile("vpand %ymm7, %ymm2, %ymm2");
107                 asm volatile("vpand %ymm7, %ymm6, %ymm6");
108                 asm volatile("vpshufb %ymm14, %ymm4, %ymm12");
109                 asm volatile("vpshufb %ymm3, %ymm4, %ymm4");
110                 asm volatile("vpshufb %ymm6, %ymm1, %ymm13");
111                 asm volatile("vpshufb %ymm2, %ymm1, %ymm1");
112                 asm volatile("vpxor %ymm4, %ymm1, %ymm1");
113                 asm volatile("vpxor %ymm12, %ymm13, %ymm13");
114 
115                 /*
116                  * 1  = pbmul[px[0]]
117                  * 13 = pbmul[px[32]]
118                  */
119                 asm volatile("vpxor %ymm5, %ymm1, %ymm1");
120                 asm volatile("vpxor %ymm15, %ymm13, %ymm13");
121 
122                 /*
123                  * 1 = db = DQ
124                  * 13 = db[32] = DQ[32]
125                  */
126                 asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
127                 asm volatile("vmovdqa %%ymm13,%0" : "=m" (dq[32]));
128                 asm volatile("vpxor %ymm1, %ymm0, %ymm0");
129                 asm volatile("vpxor %ymm13, %ymm8, %ymm8");
130 
131                 asm volatile("vmovdqa %%ymm0, %0" : "=m" (dp[0]));
132                 asm volatile("vmovdqa %%ymm8, %0" : "=m" (dp[32]));
133 
134                 bytes -= 64;
135                 p += 64;
136                 q += 64;
137                 dp += 64;
138                 dq += 64;
139 #else
140                 asm volatile("vmovdqa %0, %%ymm1" : : "m" (*q));
141                 asm volatile("vmovdqa %0, %%ymm0" : : "m" (*p));
142                 asm volatile("vpxor %0, %%ymm1, %%ymm1" : : "m" (*dq));
143                 asm volatile("vpxor %0, %%ymm0, %%ymm0" : : "m" (*dp));
144 
145                 /* 1 = dq ^ q;  0 = dp ^ p */
146 
147                 asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (qmul[0]));
148                 asm volatile("vbroadcasti128 %0, %%ymm5" : : "m" (qmul[16]));
149 
150                 /*
151                  * 1 = dq ^ q
152                  * 3 = dq ^ p >> 4
153                  */
154                 asm volatile("vpsraw $4, %ymm1, %ymm3");
155                 asm volatile("vpand %ymm7, %ymm1, %ymm1");
156                 asm volatile("vpand %ymm7, %ymm3, %ymm3");
157                 asm volatile("vpshufb %ymm1, %ymm4, %ymm4");
158                 asm volatile("vpshufb %ymm3, %ymm5, %ymm5");
159                 asm volatile("vpxor %ymm4, %ymm5, %ymm5");
160 
161                 /* 5 = qx */
162 
163                 asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (pbmul[0]));
164                 asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (pbmul[16]));
165 
166                 asm volatile("vpsraw $4, %ymm0, %ymm2");
167                 asm volatile("vpand %ymm7, %ymm0, %ymm3");
168                 asm volatile("vpand %ymm7, %ymm2, %ymm2");
169                 asm volatile("vpshufb %ymm3, %ymm4, %ymm4");
170                 asm volatile("vpshufb %ymm2, %ymm1, %ymm1");
171                 asm volatile("vpxor %ymm4, %ymm1, %ymm1");
172 
173                 /* 1 = pbmul[px] */
174                 asm volatile("vpxor %ymm5, %ymm1, %ymm1");
175                 /* 1 = db = DQ */
176                 asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
177 
178                 asm volatile("vpxor %ymm1, %ymm0, %ymm0");
179                 asm volatile("vmovdqa %%ymm0, %0" : "=m" (dp[0]));
180 
181                 bytes -= 32;
182                 p += 32;
183                 q += 32;
184                 dp += 32;
185                 dq += 32;
186 #endif
187         }
188 
189         kernel_fpu_end();
190 }
191 
192 static void raid6_datap_recov_avx2(int disks, size_t bytes, int faila,
193                 void **ptrs)
194 {
195         u8 *p, *q, *dq;
196         const u8 *qmul;         /* Q multiplier table */
197         const u8 x0f = 0x0f;
198 
199         p = (u8 *)ptrs[disks-2];
200         q = (u8 *)ptrs[disks-1];
201 
202         /* Compute syndrome with zero for the missing data page
203            Use the dead data page as temporary storage for delta q */
204         dq = (u8 *)ptrs[faila];
205         ptrs[faila] = (void *)raid6_empty_zero_page;
206         ptrs[disks-1] = dq;
207 
208         raid6_call.gen_syndrome(disks, bytes, ptrs);
209 
210         /* Restore pointer table */
211         ptrs[faila]   = dq;
212         ptrs[disks-1] = q;
213 
214         /* Now, pick the proper data tables */
215         qmul  = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila]]];
216 
217         kernel_fpu_begin();
218 
219         asm volatile("vpbroadcastb %0, %%ymm7" : : "m" (x0f));
220 
221         while (bytes) {
222 #ifdef CONFIG_X86_64
223                 asm volatile("vmovdqa %0, %%ymm3" : : "m" (dq[0]));
224                 asm volatile("vmovdqa %0, %%ymm8" : : "m" (dq[32]));
225                 asm volatile("vpxor %0, %%ymm3, %%ymm3" : : "m" (q[0]));
226                 asm volatile("vpxor %0, %%ymm8, %%ymm8" : : "m" (q[32]));
227 
228                 /*
229                  * 3 = q[0] ^ dq[0]
230                  * 8 = q[32] ^ dq[32]
231                  */
232                 asm volatile("vbroadcasti128 %0, %%ymm0" : : "m" (qmul[0]));
233                 asm volatile("vmovapd %ymm0, %ymm13");
234                 asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (qmul[16]));
235                 asm volatile("vmovapd %ymm1, %ymm14");
236 
237                 asm volatile("vpsraw $4, %ymm3, %ymm6");
238                 asm volatile("vpsraw $4, %ymm8, %ymm12");
239                 asm volatile("vpand %ymm7, %ymm3, %ymm3");
240                 asm volatile("vpand %ymm7, %ymm8, %ymm8");
241                 asm volatile("vpand %ymm7, %ymm6, %ymm6");
242                 asm volatile("vpand %ymm7, %ymm12, %ymm12");
243                 asm volatile("vpshufb %ymm3, %ymm0, %ymm0");
244                 asm volatile("vpshufb %ymm8, %ymm13, %ymm13");
245                 asm volatile("vpshufb %ymm6, %ymm1, %ymm1");
246                 asm volatile("vpshufb %ymm12, %ymm14, %ymm14");
247                 asm volatile("vpxor %ymm0, %ymm1, %ymm1");
248                 asm volatile("vpxor %ymm13, %ymm14, %ymm14");
249 
250                 /*
251                  * 1  = qmul[q[0]  ^ dq[0]]
252                  * 14 = qmul[q[32] ^ dq[32]]
253                  */
254                 asm volatile("vmovdqa %0, %%ymm2" : : "m" (p[0]));
255                 asm volatile("vmovdqa %0, %%ymm12" : : "m" (p[32]));
256                 asm volatile("vpxor %ymm1, %ymm2, %ymm2");
257                 asm volatile("vpxor %ymm14, %ymm12, %ymm12");
258 
259                 /*
260                  * 2  = p[0]  ^ qmul[q[0]  ^ dq[0]]
261                  * 12 = p[32] ^ qmul[q[32] ^ dq[32]]
262                  */
263 
264                 asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
265                 asm volatile("vmovdqa %%ymm14, %0" : "=m" (dq[32]));
266                 asm volatile("vmovdqa %%ymm2, %0" : "=m" (p[0]));
267                 asm volatile("vmovdqa %%ymm12,%0" : "=m" (p[32]));
268 
269                 bytes -= 64;
270                 p += 64;
271                 q += 64;
272                 dq += 64;
273 #else
274                 asm volatile("vmovdqa %0, %%ymm3" : : "m" (dq[0]));
275                 asm volatile("vpxor %0, %%ymm3, %%ymm3" : : "m" (q[0]));
276 
277                 /* 3 = q ^ dq */
278 
279                 asm volatile("vbroadcasti128 %0, %%ymm0" : : "m" (qmul[0]));
280                 asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (qmul[16]));
281 
282                 asm volatile("vpsraw $4, %ymm3, %ymm6");
283                 asm volatile("vpand %ymm7, %ymm3, %ymm3");
284                 asm volatile("vpand %ymm7, %ymm6, %ymm6");
285                 asm volatile("vpshufb %ymm3, %ymm0, %ymm0");
286                 asm volatile("vpshufb %ymm6, %ymm1, %ymm1");
287                 asm volatile("vpxor %ymm0, %ymm1, %ymm1");
288 
289                 /* 1 = qmul[q ^ dq] */
290 
291                 asm volatile("vmovdqa %0, %%ymm2" : : "m" (p[0]));
292                 asm volatile("vpxor %ymm1, %ymm2, %ymm2");
293 
294                 /* 2 = p ^ qmul[q ^ dq] */
295 
296                 asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
297                 asm volatile("vmovdqa %%ymm2, %0" : "=m" (p[0]));
298 
299                 bytes -= 32;
300                 p += 32;
301                 q += 32;
302                 dq += 32;
303 #endif
304         }
305 
306         kernel_fpu_end();
307 }
308 
309 const struct raid6_recov_calls raid6_recov_avx2 = {
310         .data2 = raid6_2data_recov_avx2,
311         .datap = raid6_datap_recov_avx2,
312         .valid = raid6_has_avx2,
313 #ifdef CONFIG_X86_64
314         .name = "avx2x2",
315 #else
316         .name = "avx2x1",
317 #endif
318         .priority = 2,
319 };
320 
321 #else
322 #warning "your version of binutils lacks AVX2 support"
323 #endif
324 

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