LXR linux/lib/raid6/recov

   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
  10static int raid6_has_avx2(void)
  11{
  12        return boot_cpu_has(X86_FEATURE_AVX2) &&
  13                boot_cpu_has(X86_FEATURE_AVX);
  14}
  15
  16static 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
 186static 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
 303const 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};
 314