324 lines
9 KiB
C
324 lines
9 KiB
C
/*
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* Copyright (C) 2012 Intel Corporation
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* Author: Jim Kukunas <james.t.kukunas@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; version 2
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* of the License.
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*/
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#ifdef CONFIG_AS_AVX2
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#include <linux/raid/pq.h>
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#include "x86.h"
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static int raid6_has_avx2(void)
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{
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return boot_cpu_has(X86_FEATURE_AVX2) &&
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boot_cpu_has(X86_FEATURE_AVX);
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}
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static void raid6_2data_recov_avx2(int disks, size_t bytes, int faila,
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int failb, void **ptrs)
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{
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u8 *p, *q, *dp, *dq;
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const u8 *pbmul; /* P multiplier table for B data */
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const u8 *qmul; /* Q multiplier table (for both) */
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const u8 x0f = 0x0f;
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p = (u8 *)ptrs[disks-2];
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q = (u8 *)ptrs[disks-1];
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/* Compute syndrome with zero for the missing data pages
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Use the dead data pages as temporary storage for
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delta p and delta q */
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dp = (u8 *)ptrs[faila];
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ptrs[faila] = (void *)raid6_empty_zero_page;
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ptrs[disks-2] = dp;
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dq = (u8 *)ptrs[failb];
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ptrs[failb] = (void *)raid6_empty_zero_page;
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ptrs[disks-1] = dq;
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raid6_call.gen_syndrome(disks, bytes, ptrs);
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/* Restore pointer table */
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ptrs[faila] = dp;
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ptrs[failb] = dq;
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ptrs[disks-2] = p;
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ptrs[disks-1] = q;
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/* Now, pick the proper data tables */
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pbmul = raid6_vgfmul[raid6_gfexi[failb-faila]];
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qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila] ^
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raid6_gfexp[failb]]];
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kernel_fpu_begin();
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/* ymm0 = x0f[16] */
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asm volatile("vpbroadcastb %0, %%ymm7" : : "m" (x0f));
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while (bytes) {
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#ifdef CONFIG_X86_64
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asm volatile("vmovdqa %0, %%ymm1" : : "m" (q[0]));
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asm volatile("vmovdqa %0, %%ymm9" : : "m" (q[32]));
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asm volatile("vmovdqa %0, %%ymm0" : : "m" (p[0]));
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asm volatile("vmovdqa %0, %%ymm8" : : "m" (p[32]));
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asm volatile("vpxor %0, %%ymm1, %%ymm1" : : "m" (dq[0]));
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asm volatile("vpxor %0, %%ymm9, %%ymm9" : : "m" (dq[32]));
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asm volatile("vpxor %0, %%ymm0, %%ymm0" : : "m" (dp[0]));
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asm volatile("vpxor %0, %%ymm8, %%ymm8" : : "m" (dp[32]));
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/*
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* 1 = dq[0] ^ q[0]
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* 9 = dq[32] ^ q[32]
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* 0 = dp[0] ^ p[0]
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* 8 = dp[32] ^ p[32]
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*/
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asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (qmul[0]));
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asm volatile("vbroadcasti128 %0, %%ymm5" : : "m" (qmul[16]));
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asm volatile("vpsraw $4, %ymm1, %ymm3");
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asm volatile("vpsraw $4, %ymm9, %ymm12");
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asm volatile("vpand %ymm7, %ymm1, %ymm1");
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asm volatile("vpand %ymm7, %ymm9, %ymm9");
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asm volatile("vpand %ymm7, %ymm3, %ymm3");
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asm volatile("vpand %ymm7, %ymm12, %ymm12");
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asm volatile("vpshufb %ymm9, %ymm4, %ymm14");
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asm volatile("vpshufb %ymm1, %ymm4, %ymm4");
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asm volatile("vpshufb %ymm12, %ymm5, %ymm15");
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asm volatile("vpshufb %ymm3, %ymm5, %ymm5");
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asm volatile("vpxor %ymm14, %ymm15, %ymm15");
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asm volatile("vpxor %ymm4, %ymm5, %ymm5");
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/*
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* 5 = qx[0]
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* 15 = qx[32]
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*/
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asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (pbmul[0]));
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asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (pbmul[16]));
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asm volatile("vpsraw $4, %ymm0, %ymm2");
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asm volatile("vpsraw $4, %ymm8, %ymm6");
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asm volatile("vpand %ymm7, %ymm0, %ymm3");
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asm volatile("vpand %ymm7, %ymm8, %ymm14");
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asm volatile("vpand %ymm7, %ymm2, %ymm2");
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asm volatile("vpand %ymm7, %ymm6, %ymm6");
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asm volatile("vpshufb %ymm14, %ymm4, %ymm12");
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asm volatile("vpshufb %ymm3, %ymm4, %ymm4");
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asm volatile("vpshufb %ymm6, %ymm1, %ymm13");
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asm volatile("vpshufb %ymm2, %ymm1, %ymm1");
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asm volatile("vpxor %ymm4, %ymm1, %ymm1");
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asm volatile("vpxor %ymm12, %ymm13, %ymm13");
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/*
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* 1 = pbmul[px[0]]
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* 13 = pbmul[px[32]]
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*/
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asm volatile("vpxor %ymm5, %ymm1, %ymm1");
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asm volatile("vpxor %ymm15, %ymm13, %ymm13");
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/*
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* 1 = db = DQ
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* 13 = db[32] = DQ[32]
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*/
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asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
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asm volatile("vmovdqa %%ymm13,%0" : "=m" (dq[32]));
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asm volatile("vpxor %ymm1, %ymm0, %ymm0");
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asm volatile("vpxor %ymm13, %ymm8, %ymm8");
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asm volatile("vmovdqa %%ymm0, %0" : "=m" (dp[0]));
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asm volatile("vmovdqa %%ymm8, %0" : "=m" (dp[32]));
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bytes -= 64;
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p += 64;
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q += 64;
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dp += 64;
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dq += 64;
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#else
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asm volatile("vmovdqa %0, %%ymm1" : : "m" (*q));
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asm volatile("vmovdqa %0, %%ymm0" : : "m" (*p));
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asm volatile("vpxor %0, %%ymm1, %%ymm1" : : "m" (*dq));
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asm volatile("vpxor %0, %%ymm0, %%ymm0" : : "m" (*dp));
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/* 1 = dq ^ q; 0 = dp ^ p */
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asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (qmul[0]));
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asm volatile("vbroadcasti128 %0, %%ymm5" : : "m" (qmul[16]));
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/*
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* 1 = dq ^ q
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* 3 = dq ^ p >> 4
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*/
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asm volatile("vpsraw $4, %ymm1, %ymm3");
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asm volatile("vpand %ymm7, %ymm1, %ymm1");
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asm volatile("vpand %ymm7, %ymm3, %ymm3");
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asm volatile("vpshufb %ymm1, %ymm4, %ymm4");
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asm volatile("vpshufb %ymm3, %ymm5, %ymm5");
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asm volatile("vpxor %ymm4, %ymm5, %ymm5");
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/* 5 = qx */
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asm volatile("vbroadcasti128 %0, %%ymm4" : : "m" (pbmul[0]));
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asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (pbmul[16]));
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asm volatile("vpsraw $4, %ymm0, %ymm2");
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asm volatile("vpand %ymm7, %ymm0, %ymm3");
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asm volatile("vpand %ymm7, %ymm2, %ymm2");
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asm volatile("vpshufb %ymm3, %ymm4, %ymm4");
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asm volatile("vpshufb %ymm2, %ymm1, %ymm1");
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asm volatile("vpxor %ymm4, %ymm1, %ymm1");
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/* 1 = pbmul[px] */
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asm volatile("vpxor %ymm5, %ymm1, %ymm1");
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/* 1 = db = DQ */
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asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
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asm volatile("vpxor %ymm1, %ymm0, %ymm0");
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asm volatile("vmovdqa %%ymm0, %0" : "=m" (dp[0]));
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bytes -= 32;
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p += 32;
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q += 32;
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dp += 32;
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dq += 32;
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#endif
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}
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kernel_fpu_end();
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}
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static void raid6_datap_recov_avx2(int disks, size_t bytes, int faila,
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void **ptrs)
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{
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u8 *p, *q, *dq;
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const u8 *qmul; /* Q multiplier table */
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const u8 x0f = 0x0f;
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p = (u8 *)ptrs[disks-2];
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q = (u8 *)ptrs[disks-1];
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/* Compute syndrome with zero for the missing data page
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Use the dead data page as temporary storage for delta q */
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dq = (u8 *)ptrs[faila];
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ptrs[faila] = (void *)raid6_empty_zero_page;
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ptrs[disks-1] = dq;
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raid6_call.gen_syndrome(disks, bytes, ptrs);
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/* Restore pointer table */
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ptrs[faila] = dq;
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ptrs[disks-1] = q;
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/* Now, pick the proper data tables */
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qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila]]];
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kernel_fpu_begin();
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asm volatile("vpbroadcastb %0, %%ymm7" : : "m" (x0f));
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while (bytes) {
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#ifdef CONFIG_X86_64
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asm volatile("vmovdqa %0, %%ymm3" : : "m" (dq[0]));
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asm volatile("vmovdqa %0, %%ymm8" : : "m" (dq[32]));
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asm volatile("vpxor %0, %%ymm3, %%ymm3" : : "m" (q[0]));
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asm volatile("vpxor %0, %%ymm8, %%ymm8" : : "m" (q[32]));
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/*
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* 3 = q[0] ^ dq[0]
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* 8 = q[32] ^ dq[32]
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*/
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asm volatile("vbroadcasti128 %0, %%ymm0" : : "m" (qmul[0]));
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asm volatile("vmovapd %ymm0, %ymm13");
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asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (qmul[16]));
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asm volatile("vmovapd %ymm1, %ymm14");
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asm volatile("vpsraw $4, %ymm3, %ymm6");
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asm volatile("vpsraw $4, %ymm8, %ymm12");
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asm volatile("vpand %ymm7, %ymm3, %ymm3");
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asm volatile("vpand %ymm7, %ymm8, %ymm8");
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asm volatile("vpand %ymm7, %ymm6, %ymm6");
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asm volatile("vpand %ymm7, %ymm12, %ymm12");
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asm volatile("vpshufb %ymm3, %ymm0, %ymm0");
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asm volatile("vpshufb %ymm8, %ymm13, %ymm13");
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asm volatile("vpshufb %ymm6, %ymm1, %ymm1");
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asm volatile("vpshufb %ymm12, %ymm14, %ymm14");
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asm volatile("vpxor %ymm0, %ymm1, %ymm1");
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asm volatile("vpxor %ymm13, %ymm14, %ymm14");
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/*
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* 1 = qmul[q[0] ^ dq[0]]
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* 14 = qmul[q[32] ^ dq[32]]
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*/
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asm volatile("vmovdqa %0, %%ymm2" : : "m" (p[0]));
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asm volatile("vmovdqa %0, %%ymm12" : : "m" (p[32]));
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asm volatile("vpxor %ymm1, %ymm2, %ymm2");
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asm volatile("vpxor %ymm14, %ymm12, %ymm12");
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/*
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* 2 = p[0] ^ qmul[q[0] ^ dq[0]]
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* 12 = p[32] ^ qmul[q[32] ^ dq[32]]
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*/
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asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
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asm volatile("vmovdqa %%ymm14, %0" : "=m" (dq[32]));
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asm volatile("vmovdqa %%ymm2, %0" : "=m" (p[0]));
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asm volatile("vmovdqa %%ymm12,%0" : "=m" (p[32]));
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bytes -= 64;
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p += 64;
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q += 64;
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dq += 64;
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#else
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asm volatile("vmovdqa %0, %%ymm3" : : "m" (dq[0]));
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asm volatile("vpxor %0, %%ymm3, %%ymm3" : : "m" (q[0]));
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/* 3 = q ^ dq */
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asm volatile("vbroadcasti128 %0, %%ymm0" : : "m" (qmul[0]));
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asm volatile("vbroadcasti128 %0, %%ymm1" : : "m" (qmul[16]));
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asm volatile("vpsraw $4, %ymm3, %ymm6");
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asm volatile("vpand %ymm7, %ymm3, %ymm3");
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asm volatile("vpand %ymm7, %ymm6, %ymm6");
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asm volatile("vpshufb %ymm3, %ymm0, %ymm0");
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asm volatile("vpshufb %ymm6, %ymm1, %ymm1");
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asm volatile("vpxor %ymm0, %ymm1, %ymm1");
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/* 1 = qmul[q ^ dq] */
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asm volatile("vmovdqa %0, %%ymm2" : : "m" (p[0]));
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asm volatile("vpxor %ymm1, %ymm2, %ymm2");
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/* 2 = p ^ qmul[q ^ dq] */
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asm volatile("vmovdqa %%ymm1, %0" : "=m" (dq[0]));
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asm volatile("vmovdqa %%ymm2, %0" : "=m" (p[0]));
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bytes -= 32;
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p += 32;
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q += 32;
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dq += 32;
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#endif
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}
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kernel_fpu_end();
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}
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const struct raid6_recov_calls raid6_recov_avx2 = {
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.data2 = raid6_2data_recov_avx2,
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.datap = raid6_datap_recov_avx2,
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.valid = raid6_has_avx2,
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#ifdef CONFIG_X86_64
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.name = "avx2x2",
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#else
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.name = "avx2x1",
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#endif
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.priority = 2,
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};
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#else
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#warning "your version of binutils lacks AVX2 support"
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#endif
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