lib/raid6/recov_avx2.c

   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