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