lib/raid6/recov_avx2.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Intel Corporation
   4  * Author: Jim Kukunas <james.t.kukunas@linux.intel.com>
   5  */
   6
   7 #ifdef CONFIG_AS_AVX2
   8
   9 #include <linux/raid/pq.h>
  10 #include "x86.h"
  11
  12 static int raid6_has_avx2(void)
  13 {
  14         return boot_cpu_has(X86_FEATURE_AVX2) &&
  15                 boot_cpu_has(X86_FEATURE_AVX);
  16 }
  17
  18 static void raid6_2data_recov_avx2(int disks, size_t bytes, int faila,
  19                 int failb, void **ptrs)
  20 {
  21         u8 *p, *q, *dp, *dq;
  22         const u8 *pbmul;        /* P multiplier table for B data */
  23         const u8 *qmul;         /* Q multiplier table (for both) */
  24         const u8 x0f = 0x0f;
  25
  26         p = (u8 *)ptrs[disks-2];
  27         q = (u8 *)ptrs[disks-1];
  28
  29         /* Compute syndrome with zero for the missing data pages
  30            Use the dead data pages as temporary storage for
  31            delta p and delta q */
  32         dp = (u8 *)ptrs[faila];
  33         ptrs[faila] = (void *)raid6_empty_zero_page;
  34         ptrs[disks-2] = dp;
  35         dq = (u8 *)ptrs[failb];
  36         ptrs[failb] = (void *)raid6_empty_zero_page;
  37         ptrs[disks-1] = dq;
  38
  39         raid6_call.gen_syndrome(disks, bytes, ptrs);
  40
  41         /* Restore pointer table */
  42         ptrs[faila]   = dp;
  43         ptrs[failb]   = dq;
  44         ptrs[disks-2] = p;
  45         ptrs[disks-1] = q;
  46
  47         /* Now, pick the proper data tables */
  48         pbmul = raid6_vgfmul[raid6_gfexi[failb-faila]];
  49         qmul  = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila] ^
  50                 raid6_gfexp[failb]]];
  51
  52         kernel_fpu_begin();
  53
  54         /* ymm0 = x0f[16] */
  55         asm volatile("vpbroadcastb %0, %%ymm7" : : "m" (x0f));
  56
  57         while (bytes) {
  58 #ifdef CONFIG_X86_64
  59                 asm volatile("vmovdqa %0, %%ymm1" : : "m" (q[0]));
  60                 asm volatile("vmovdqa %0, %%ymm9" : : "m" (q[32]));
  61                 asm volatile("vmovdqa %0, %%ymm0" : : "m" (p[0]));
  62                 asm volatile("vmovdqa %0, %%ymm8" : : "m" (p[32]));
  63                 asm volatile("vpxor %0, %%ymm1, %%ymm1" : : "m" (dq[0]));
  64                 asm volatile("vpxor %0, %%ymm9, %%ymm9" : : "m" (dq[32]));
  65                 asm volatile("vpxor %0, %%ymm0, %%ymm0" : : "m" (dp[0]));
  66                 asm volatile("vpxor %0, %%ymm8, %%ymm8" : : "m" (dp[32]));
  67
  68                 /*
  69                  * 1 = dq[0]  ^ q[0]
  70                  * 9 = dq[32] ^ q[32]
  71                  * 0 = dp[0]  ^ p[0]
  72                  * 8 = dp[32] ^ p[32]
  73                  */
  74
  75                 asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (qmul[0]));
  76                 asm volatile("vbroadcasti128 %0, %%ymm5" : : "m" (qmul[16]));
  77
  78                 asm volatile("vpsraw $4, %ymm1, %ymm3");
  79                 asm volatile("vpsraw $4, %ymm9, %ymm12");
  80                 asm volatile("vpand %ymm7, %ymm1, %ymm1");
  81                 asm volatile("vpand %ymm7, %ymm9, %ymm9");
  82                 asm volatile("vpand %ymm7, %ymm3, %ymm3");
  83                 asm volatile("vpand %ymm7, %ymm12, %ymm12");
  84                 asm volatile("vpshufb %ymm9, %ymm4, %ymm14");
  85                 asm volatile("vpshufb %ymm1, %ymm4, %ymm4");
  86                 asm volatile("vpshufb %ymm12, %ymm5, %ymm15");
  87                 asm volatile("vpshufb %ymm3, %ymm5, %ymm5");
  88                 asm volatile("vpxor %ymm14, %ymm15, %ymm15");
  89                 asm volatile("vpxor %ymm4, %ymm5, %ymm5");
  90
  91                 /*
  92                  * 5 = qx[0]
  93                  * 15 = qx[32]
  94                  */
  95
  96                 asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (pbmul[0]));
  97                 asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (pbmul[16]));
  98                 asm volatile("vpsraw $4, %ymm0, %ymm2");
  99                 asm volatile("vpsraw $4, %ymm8, %ymm6");
 100                 asm volatile("vpand %ymm7, %ymm0, %ymm3");
 101                 asm volatile("vpand %ymm7, %ymm8, %ymm14");
 102                 asm volatile("vpand %ymm7, %ymm2, %ymm2");
 103                 asm volatile("vpand %ymm7, %ymm6, %ymm6");
 104                 asm volatile("vpshufb %ymm14, %ymm4, %ymm12");
 105                 asm volatile("vpshufb %ymm3, %ymm4, %ymm4");
 106                 asm volatile("vpshufb %ymm6, %ymm1, %ymm13");
 107                 asm volatile("vpshufb %ymm2, %ymm1, %ymm1");
 108                 asm volatile("vpxor %ymm4, %ymm1, %ymm1");
 109                 asm volatile("vpxor %ymm12, %ymm13, %ymm13");
 110
 111                 /*
 112                  * 1  = pbmul[px[0]]
 113                  * 13 = pbmul[px[32]]
 114                  */
 115                 asm volatile("vpxor %ymm5, %ymm1, %ymm1");
 116                 asm volatile("vpxor %ymm15, %ymm13, %ymm13");
 117
 118                 /*
 119                  * 1 = db = DQ
 120                  * 13 = db[32] = DQ[32]
 121                  */
 122                 asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
 123                 asm volatile("vmovdqa %%ymm13,%0" : "=m" (dq[32]));
 124                 asm volatile("vpxor %ymm1, %ymm0, %ymm0");
 125                 asm volatile("vpxor %ymm13, %ymm8, %ymm8");
 126
 127                 asm volatile("vmovdqa %%ymm0, %0" : "=m" (dp[0]));
 128                 asm volatile("vmovdqa %%ymm8, %0" : "=m" (dp[32]));
 129
 130                 bytes -= 64;
 131                 p += 64;
 132                 q += 64;
 133                 dp += 64;
 134                 dq += 64;
 135 #else
 136                 asm volatile("vmovdqa %0, %%ymm1" : : "m" (*q));
 137                 asm volatile("vmovdqa %0, %%ymm0" : : "m" (*p));
 138                 asm volatile("vpxor %0, %%ymm1, %%ymm1" : : "m" (*dq));
 139                 asm volatile("vpxor %0, %%ymm0, %%ymm0" : : "m" (*dp));
 140
 141                 /* 1 = dq ^ q;  0 = dp ^ p */
 142
 143                 asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (qmul[0]));
 144                 asm volatile("vbroadcasti128 %0, %%ymm5" : : "m" (qmul[16]));
 145
 146                 /*
 147                  * 1 = dq ^ q
 148                  * 3 = dq ^ p >> 4
 149                  */
 150                 asm volatile("vpsraw $4, %ymm1, %ymm3");
 151                 asm volatile("vpand %ymm7, %ymm1, %ymm1");
 152                 asm volatile("vpand %ymm7, %ymm3, %ymm3");
 153                 asm volatile("vpshufb %ymm1, %ymm4, %ymm4");
 154                 asm volatile("vpshufb %ymm3, %ymm5, %ymm5");
 155                 asm volatile("vpxor %ymm4, %ymm5, %ymm5");
 156
 157                 /* 5 = qx */
 158
 159                 asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (pbmul[0]));
 160                 asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (pbmul[16]));
 161
 162                 asm volatile("vpsraw $4, %ymm0, %ymm2");
 163                 asm volatile("vpand %ymm7, %ymm0, %ymm3");
 164                 asm volatile("vpand %ymm7, %ymm2, %ymm2");
 165                 asm volatile("vpshufb %ymm3, %ymm4, %ymm4");
 166                 asm volatile("vpshufb %ymm2, %ymm1, %ymm1");
 167                 asm volatile("vpxor %ymm4, %ymm1, %ymm1");
 168
 169                 /* 1 = pbmul[px] */
 170                 asm volatile("vpxor %ymm5, %ymm1, %ymm1");
 171                 /* 1 = db = DQ */
 172                 asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
 173
 174                 asm volatile("vpxor %ymm1, %ymm0, %ymm0");
 175                 asm volatile("vmovdqa %%ymm0, %0" : "=m" (dp[0]));
 176
 177                 bytes -= 32;
 178                 p += 32;
 179                 q += 32;
 180                 dp += 32;
 181                 dq += 32;
 182 #endif
 183         }
 184
 185         kernel_fpu_end();
 186 }
 187
 188 static void raid6_datap_recov_avx2(int disks, size_t bytes, int faila,
 189                 void **ptrs)
 190 {
 191         u8 *p, *q, *dq;
 192         const u8 *qmul;         /* Q multiplier table */
 193         const u8 x0f = 0x0f;
 194
 195         p = (u8 *)ptrs[disks-2];
 196         q = (u8 *)ptrs[disks-1];
 197
 198         /* Compute syndrome with zero for the missing data page
 199            Use the dead data page as temporary storage for delta q */
 200         dq = (u8 *)ptrs[faila];
 201         ptrs[faila] = (void *)raid6_empty_zero_page;
 202         ptrs[disks-1] = dq;
 203
 204         raid6_call.gen_syndrome(disks, bytes, ptrs);
 205
 206         /* Restore pointer table */
 207         ptrs[faila]   = dq;
 208         ptrs[disks-1] = q;
 209
 210         /* Now, pick the proper data tables */
 211         qmul  = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila]]];
 212
 213         kernel_fpu_begin();
 214
 215         asm volatile("vpbroadcastb %0, %%ymm7" : : "m" (x0f));
 216
 217         while (bytes) {
 218 #ifdef CONFIG_X86_64
 219                 asm volatile("vmovdqa %0, %%ymm3" : : "m" (dq[0]));
 220                 asm volatile("vmovdqa %0, %%ymm8" : : "m" (dq[32]));
 221                 asm volatile("vpxor %0, %%ymm3, %%ymm3" : : "m" (q[0]));
 222                 asm volatile("vpxor %0, %%ymm8, %%ymm8" : : "m" (q[32]));
 223
 224                 /*
 225                  * 3 = q[0] ^ dq[0]
 226                  * 8 = q[32] ^ dq[32]
 227                  */
 228                 asm volatile("vbroadcasti128 %0, %%ymm0" : : "m" (qmul[0]));
 229                 asm volatile("vmovapd %ymm0, %ymm13");
 230                 asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (qmul[16]));
 231                 asm volatile("vmovapd %ymm1, %ymm14");
 232
 233                 asm volatile("vpsraw $4, %ymm3, %ymm6");
 234                 asm volatile("vpsraw $4, %ymm8, %ymm12");
 235                 asm volatile("vpand %ymm7, %ymm3, %ymm3");
 236                 asm volatile("vpand %ymm7, %ymm8, %ymm8");
 237                 asm volatile("vpand %ymm7, %ymm6, %ymm6");
 238                 asm volatile("vpand %ymm7, %ymm12, %ymm12");
 239                 asm volatile("vpshufb %ymm3, %ymm0, %ymm0");
 240                 asm volatile("vpshufb %ymm8, %ymm13, %ymm13");
 241                 asm volatile("vpshufb %ymm6, %ymm1, %ymm1");
 242                 asm volatile("vpshufb %ymm12, %ymm14, %ymm14");
 243                 asm volatile("vpxor %ymm0, %ymm1, %ymm1");
 244                 asm volatile("vpxor %ymm13, %ymm14, %ymm14");
 245
 246                 /*
 247                  * 1  = qmul[q[0]  ^ dq[0]]
 248                  * 14 = qmul[q[32] ^ dq[32]]
 249                  */
 250                 asm volatile("vmovdqa %0, %%ymm2" : : "m" (p[0]));
 251                 asm volatile("vmovdqa %0, %%ymm12" : : "m" (p[32]));
 252                 asm volatile("vpxor %ymm1, %ymm2, %ymm2");
 253                 asm volatile("vpxor %ymm14, %ymm12, %ymm12");
 254
 255                 /*
 256                  * 2  = p[0]  ^ qmul[q[0]  ^ dq[0]]
 257                  * 12 = p[32] ^ qmul[q[32] ^ dq[32]]
 258                  */
 259
 260                 asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
 261                 asm volatile("vmovdqa %%ymm14, %0" : "=m" (dq[32]));
 262                 asm volatile("vmovdqa %%ymm2, %0" : "=m" (p[0]));
 263                 asm volatile("vmovdqa %%ymm12,%0" : "=m" (p[32]));
 264
 265                 bytes -= 64;
 266                 p += 64;
 267                 q += 64;
 268                 dq += 64;
 269 #else
 270                 asm volatile("vmovdqa %0, %%ymm3" : : "m" (dq[0]));
 271                 asm volatile("vpxor %0, %%ymm3, %%ymm3" : : "m" (q[0]));
 272
 273                 /* 3 = q ^ dq */
 274
 275                 asm volatile("vbroadcasti128 %0, %%ymm0" : : "m" (qmul[0]));
 276                 asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (qmul[16]));
 277
 278                 asm volatile("vpsraw $4, %ymm3, %ymm6");
 279                 asm volatile("vpand %ymm7, %ymm3, %ymm3");
 280                 asm volatile("vpand %ymm7, %ymm6, %ymm6");
 281                 asm volatile("vpshufb %ymm3, %ymm0, %ymm0");
 282                 asm volatile("vpshufb %ymm6, %ymm1, %ymm1");
 283                 asm volatile("vpxor %ymm0, %ymm1, %ymm1");
 284
 285                 /* 1 = qmul[q ^ dq] */
 286
 287                 asm volatile("vmovdqa %0, %%ymm2" : : "m" (p[0]));
 288                 asm volatile("vpxor %ymm1, %ymm2, %ymm2");
 289
 290                 /* 2 = p ^ qmul[q ^ dq] */
 291
 292                 asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
 293                 asm volatile("vmovdqa %%ymm2, %0" : "=m" (p[0]));
 294
 295                 bytes -= 32;
 296                 p += 32;
 297                 q += 32;
 298                 dq += 32;
 299 #endif
 300         }
 301
 302         kernel_fpu_end();
 303 }
 304
 305 const struct raid6_recov_calls raid6_recov_avx2 = {
 306         .data2 = raid6_2data_recov_avx2,
 307         .datap = raid6_datap_recov_avx2,
 308         .valid = raid6_has_avx2,
 309 #ifdef CONFIG_X86_64
 310         .name = "avx2x2",
 311 #else
 312         .name = "avx2x1",
 313 #endif
 314         .priority = 2,
 315 };
 316
 317 #else
 318 #warning "your version of binutils lacks AVX2 support"
 319 #endif