lib/raid6/recov_avx512.c

   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
  19 static 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
  29 static 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
 232 static 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
 374 const 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