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1/*
2 * Copyright (C) 2016 Intel Corporation
3 *
4 * Author: Gayatri Kammela <gayatri.kammela@intel.com>
5 * Author: Megha Dey <megha.dey@linux.intel.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; version 2
10 * of the License.
11 *
12 */
13
14#ifdef CONFIG_AS_AVX512
15
16#include <linux/raid/pq.h>
17#include "x86.h"
18
19static int raid6_has_avx512(void)
20{
21 return boot_cpu_has(X86_FEATURE_AVX2) &&
22 boot_cpu_has(X86_FEATURE_AVX) &&
23 boot_cpu_has(X86_FEATURE_AVX512F) &&
24 boot_cpu_has(X86_FEATURE_AVX512BW) &&
25 boot_cpu_has(X86_FEATURE_AVX512VL) &&
26 boot_cpu_has(X86_FEATURE_AVX512DQ);
27}
28
29static void raid6_2data_recov_avx512(int disks, size_t bytes, int faila,
30 int failb, void **ptrs)
31{
32 u8 *p, *q, *dp, *dq;
33 const u8 *pbmul; /* P multiplier table for B data */
34 const u8 *qmul; /* Q multiplier table (for both) */
35 const u8 x0f = 0x0f;
36
37 p = (u8 *)ptrs[disks-2];
38 q = (u8 *)ptrs[disks-1];
39
40 /*
41 * Compute syndrome with zero for the missing data pages
42 * Use the dead data pages as temporary storage for
43 * delta p and delta q
44 */
45
46 dp = (u8 *)ptrs[faila];
47 ptrs[faila] = (void *)raid6_empty_zero_page;
48 ptrs[disks-2] = dp;
49 dq = (u8 *)ptrs[failb];
50 ptrs[failb] = (void *)raid6_empty_zero_page;
51 ptrs[disks-1] = dq;
52
53 raid6_call.gen_syndrome(disks, bytes, ptrs);
54
55 /* Restore pointer table */
56 ptrs[faila] = dp;
57 ptrs[failb] = dq;
58 ptrs[disks-2] = p;
59 ptrs[disks-1] = q;
60
61 /* Now, pick the proper data tables */
62 pbmul = raid6_vgfmul[raid6_gfexi[failb-faila]];
63 qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila] ^
64 raid6_gfexp[failb]]];
65
66 kernel_fpu_begin();
67
68 /* zmm0 = x0f[16] */
69 asm volatile("vpbroadcastb %0, %%zmm7" : : "m" (x0f));
70
71 while (bytes) {
72#ifdef CONFIG_X86_64
73 asm volatile("vmovdqa64 %0, %%zmm1\n\t"
74 "vmovdqa64 %1, %%zmm9\n\t"
75 "vmovdqa64 %2, %%zmm0\n\t"
76 "vmovdqa64 %3, %%zmm8\n\t"
77 "vpxorq %4, %%zmm1, %%zmm1\n\t"
78 "vpxorq %5, %%zmm9, %%zmm9\n\t"
79 "vpxorq %6, %%zmm0, %%zmm0\n\t"
80 "vpxorq %7, %%zmm8, %%zmm8"
81 :
82 : "m" (q[0]), "m" (q[64]), "m" (p[0]),
83 "m" (p[64]), "m" (dq[0]), "m" (dq[64]),
84 "m" (dp[0]), "m" (dp[64]));
85
86 /*
87 * 1 = dq[0] ^ q[0]
88 * 9 = dq[64] ^ q[64]
89 * 0 = dp[0] ^ p[0]
90 * 8 = dp[64] ^ p[64]
91 */
92
93 asm volatile("vbroadcasti64x2 %0, %%zmm4\n\t"
94 "vbroadcasti64x2 %1, %%zmm5"
95 :
96 : "m" (qmul[0]), "m" (qmul[16]));
97
98 asm volatile("vpsraw $4, %%zmm1, %%zmm3\n\t"
99 "vpsraw $4, %%zmm9, %%zmm12\n\t"
100 "vpandq %%zmm7, %%zmm1, %%zmm1\n\t"
101 "vpandq %%zmm7, %%zmm9, %%zmm9\n\t"
102 "vpandq %%zmm7, %%zmm3, %%zmm3\n\t"
103 "vpandq %%zmm7, %%zmm12, %%zmm12\n\t"
104 "vpshufb %%zmm9, %%zmm4, %%zmm14\n\t"
105 "vpshufb %%zmm1, %%zmm4, %%zmm4\n\t"
106 "vpshufb %%zmm12, %%zmm5, %%zmm15\n\t"
107 "vpshufb %%zmm3, %%zmm5, %%zmm5\n\t"
108 "vpxorq %%zmm14, %%zmm15, %%zmm15\n\t"
109 "vpxorq %%zmm4, %%zmm5, %%zmm5"
110 :
111 : );
112
113 /*
114 * 5 = qx[0]
115 * 15 = qx[64]
116 */
117
118 asm volatile("vbroadcasti64x2 %0, %%zmm4\n\t"
119 "vbroadcasti64x2 %1, %%zmm1\n\t"
120 "vpsraw $4, %%zmm0, %%zmm2\n\t"
121 "vpsraw $4, %%zmm8, %%zmm6\n\t"
122 "vpandq %%zmm7, %%zmm0, %%zmm3\n\t"
123 "vpandq %%zmm7, %%zmm8, %%zmm14\n\t"
124 "vpandq %%zmm7, %%zmm2, %%zmm2\n\t"
125 "vpandq %%zmm7, %%zmm6, %%zmm6\n\t"
126 "vpshufb %%zmm14, %%zmm4, %%zmm12\n\t"
127 "vpshufb %%zmm3, %%zmm4, %%zmm4\n\t"
128 "vpshufb %%zmm6, %%zmm1, %%zmm13\n\t"
129 "vpshufb %%zmm2, %%zmm1, %%zmm1\n\t"
130 "vpxorq %%zmm4, %%zmm1, %%zmm1\n\t"
131 "vpxorq %%zmm12, %%zmm13, %%zmm13"
132 :
133 : "m" (pbmul[0]), "m" (pbmul[16]));
134
135 /*
136 * 1 = pbmul[px[0]]
137 * 13 = pbmul[px[64]]
138 */
139 asm volatile("vpxorq %%zmm5, %%zmm1, %%zmm1\n\t"
140 "vpxorq %%zmm15, %%zmm13, %%zmm13"
141 :
142 : );
143
144 /*
145 * 1 = db = DQ
146 * 13 = db[64] = DQ[64]
147 */
148 asm volatile("vmovdqa64 %%zmm1, %0\n\t"
149 "vmovdqa64 %%zmm13,%1\n\t"
150 "vpxorq %%zmm1, %%zmm0, %%zmm0\n\t"
151 "vpxorq %%zmm13, %%zmm8, %%zmm8"
152 :
153 : "m" (dq[0]), "m" (dq[64]));
154
155 asm volatile("vmovdqa64 %%zmm0, %0\n\t"
156 "vmovdqa64 %%zmm8, %1"
157 :
158 : "m" (dp[0]), "m" (dp[64]));
159
160 bytes -= 128;
161 p += 128;
162 q += 128;
163 dp += 128;
164 dq += 128;
165#else
166 asm volatile("vmovdqa64 %0, %%zmm1\n\t"
167 "vmovdqa64 %1, %%zmm0\n\t"
168 "vpxorq %2, %%zmm1, %%zmm1\n\t"
169 "vpxorq %3, %%zmm0, %%zmm0"
170 :
171 : "m" (*q), "m" (*p), "m"(*dq), "m" (*dp));
172
173 /* 1 = dq ^ q; 0 = dp ^ p */
174
175 asm volatile("vbroadcasti64x2 %0, %%zmm4\n\t"
176 "vbroadcasti64x2 %1, %%zmm5"
177 :
178 : "m" (qmul[0]), "m" (qmul[16]));
179
180 /*
181 * 1 = dq ^ q
182 * 3 = dq ^ p >> 4
183 */
184 asm volatile("vpsraw $4, %%zmm1, %%zmm3\n\t"
185 "vpandq %%zmm7, %%zmm1, %%zmm1\n\t"
186 "vpandq %%zmm7, %%zmm3, %%zmm3\n\t"
187 "vpshufb %%zmm1, %%zmm4, %%zmm4\n\t"
188 "vpshufb %%zmm3, %%zmm5, %%zmm5\n\t"
189 "vpxorq %%zmm4, %%zmm5, %%zmm5"
190 :
191 : );
192
193 /* 5 = qx */
194
195 asm volatile("vbroadcasti64x2 %0, %%zmm4\n\t"
196 "vbroadcasti64x2 %1, %%zmm1"
197 :
198 : "m" (pbmul[0]), "m" (pbmul[16]));
199
200 asm volatile("vpsraw $4, %%zmm0, %%zmm2\n\t"
201 "vpandq %%zmm7, %%zmm0, %%zmm3\n\t"
202 "vpandq %%zmm7, %%zmm2, %%zmm2\n\t"
203 "vpshufb %%zmm3, %%zmm4, %%zmm4\n\t"
204 "vpshufb %%zmm2, %%zmm1, %%zmm1\n\t"
205 "vpxorq %%zmm4, %%zmm1, %%zmm1"
206 :
207 : );
208
209 /* 1 = pbmul[px] */
210 asm volatile("vpxorq %%zmm5, %%zmm1, %%zmm1\n\t"
211 /* 1 = db = DQ */
212 "vmovdqa64 %%zmm1, %0\n\t"
213 :
214 : "m" (dq[0]));
215
216 asm volatile("vpxorq %%zmm1, %%zmm0, %%zmm0\n\t"
217 "vmovdqa64 %%zmm0, %0"
218 :
219 : "m" (dp[0]));
220
221 bytes -= 64;
222 p += 64;
223 q += 64;
224 dp += 64;
225 dq += 64;
226#endif
227 }
228
229 kernel_fpu_end();
230}
231
232static void raid6_datap_recov_avx512(int disks, size_t bytes, int faila,
233 void **ptrs)
234{
235 u8 *p, *q, *dq;
236 const u8 *qmul; /* Q multiplier table */
237 const u8 x0f = 0x0f;
238
239 p = (u8 *)ptrs[disks-2];
240 q = (u8 *)ptrs[disks-1];
241
242 /*
243 * Compute syndrome with zero for the missing data page
244 * Use the dead data page as temporary storage for delta q
245 */
246
247 dq = (u8 *)ptrs[faila];
248 ptrs[faila] = (void *)raid6_empty_zero_page;
249 ptrs[disks-1] = dq;
250
251 raid6_call.gen_syndrome(disks, bytes, ptrs);
252
253 /* Restore pointer table */
254 ptrs[faila] = dq;
255 ptrs[disks-1] = q;
256
257 /* Now, pick the proper data tables */
258 qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila]]];
259
260 kernel_fpu_begin();
261
262 asm volatile("vpbroadcastb %0, %%zmm7" : : "m" (x0f));
263
264 while (bytes) {
265#ifdef CONFIG_X86_64
266 asm volatile("vmovdqa64 %0, %%zmm3\n\t"
267 "vmovdqa64 %1, %%zmm8\n\t"
268 "vpxorq %2, %%zmm3, %%zmm3\n\t"
269 "vpxorq %3, %%zmm8, %%zmm8"
270 :
271 : "m" (dq[0]), "m" (dq[64]), "m" (q[0]),
272 "m" (q[64]));
273
274 /*
275 * 3 = q[0] ^ dq[0]
276 * 8 = q[64] ^ dq[64]
277 */
278 asm volatile("vbroadcasti64x2 %0, %%zmm0\n\t"
279 "vmovapd %%zmm0, %%zmm13\n\t"
280 "vbroadcasti64x2 %1, %%zmm1\n\t"
281 "vmovapd %%zmm1, %%zmm14"
282 :
283 : "m" (qmul[0]), "m" (qmul[16]));
284
285 asm volatile("vpsraw $4, %%zmm3, %%zmm6\n\t"
286 "vpsraw $4, %%zmm8, %%zmm12\n\t"
287 "vpandq %%zmm7, %%zmm3, %%zmm3\n\t"
288 "vpandq %%zmm7, %%zmm8, %%zmm8\n\t"
289 "vpandq %%zmm7, %%zmm6, %%zmm6\n\t"
290 "vpandq %%zmm7, %%zmm12, %%zmm12\n\t"
291 "vpshufb %%zmm3, %%zmm0, %%zmm0\n\t"
292 "vpshufb %%zmm8, %%zmm13, %%zmm13\n\t"
293 "vpshufb %%zmm6, %%zmm1, %%zmm1\n\t"
294 "vpshufb %%zmm12, %%zmm14, %%zmm14\n\t"
295 "vpxorq %%zmm0, %%zmm1, %%zmm1\n\t"
296 "vpxorq %%zmm13, %%zmm14, %%zmm14"
297 :
298 : );
299
300 /*
301 * 1 = qmul[q[0] ^ dq[0]]
302 * 14 = qmul[q[64] ^ dq[64]]
303 */
304 asm volatile("vmovdqa64 %0, %%zmm2\n\t"
305 "vmovdqa64 %1, %%zmm12\n\t"
306 "vpxorq %%zmm1, %%zmm2, %%zmm2\n\t"
307 "vpxorq %%zmm14, %%zmm12, %%zmm12"
308 :
309 : "m" (p[0]), "m" (p[64]));
310
311 /*
312 * 2 = p[0] ^ qmul[q[0] ^ dq[0]]
313 * 12 = p[64] ^ qmul[q[64] ^ dq[64]]
314 */
315
316 asm volatile("vmovdqa64 %%zmm1, %0\n\t"
317 "vmovdqa64 %%zmm14, %1\n\t"
318 "vmovdqa64 %%zmm2, %2\n\t"
319 "vmovdqa64 %%zmm12,%3"
320 :
321 : "m" (dq[0]), "m" (dq[64]), "m" (p[0]),
322 "m" (p[64]));
323
324 bytes -= 128;
325 p += 128;
326 q += 128;
327 dq += 128;
328#else
329 asm volatile("vmovdqa64 %0, %%zmm3\n\t"
330 "vpxorq %1, %%zmm3, %%zmm3"
331 :
332 : "m" (dq[0]), "m" (q[0]));
333
334 /* 3 = q ^ dq */
335
336 asm volatile("vbroadcasti64x2 %0, %%zmm0\n\t"
337 "vbroadcasti64x2 %1, %%zmm1"
338 :
339 : "m" (qmul[0]), "m" (qmul[16]));
340
341 asm volatile("vpsraw $4, %%zmm3, %%zmm6\n\t"
342 "vpandq %%zmm7, %%zmm3, %%zmm3\n\t"
343 "vpandq %%zmm7, %%zmm6, %%zmm6\n\t"
344 "vpshufb %%zmm3, %%zmm0, %%zmm0\n\t"
345 "vpshufb %%zmm6, %%zmm1, %%zmm1\n\t"
346 "vpxorq %%zmm0, %%zmm1, %%zmm1"
347 :
348 : );
349
350 /* 1 = qmul[q ^ dq] */
351
352 asm volatile("vmovdqa64 %0, %%zmm2\n\t"
353 "vpxorq %%zmm1, %%zmm2, %%zmm2"
354 :
355 : "m" (p[0]));
356
357 /* 2 = p ^ qmul[q ^ dq] */
358
359 asm volatile("vmovdqa64 %%zmm1, %0\n\t"
360 "vmovdqa64 %%zmm2, %1"
361 :
362 : "m" (dq[0]), "m" (p[0]));
363
364 bytes -= 64;
365 p += 64;
366 q += 64;
367 dq += 64;
368#endif
369 }
370
371 kernel_fpu_end();
372}
373
374const struct raid6_recov_calls raid6_recov_avx512 = {
375 .data2 = raid6_2data_recov_avx512,
376 .datap = raid6_datap_recov_avx512,
377 .valid = raid6_has_avx512,
378#ifdef CONFIG_X86_64
379 .name = "avx512x2",
380#else
381 .name = "avx512x1",
382#endif
383 .priority = 3,
384};
385
386#else
387#warning "your version of binutils lacks AVX512 support"
388#endif