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linux-stable/lib/raid6/recov_ssse3.c
Jan Beulich 75aaf4c3e6 x86/raid6: correctly check for assembler capabilities 
Just like for AVX2 (which simply needs an #if -> #ifdef conversion),
SSSE3 assembler support should be checked for before using it.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: Jim Kukunas <james.t.kukunas@linux.intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NeilBrown <neilb@suse.de>
2015-02-04 08:35:51 +11:00

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/*
* Copyright (C) 2012 Intel Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; version 2
* of the License.
*/
#ifdef CONFIG_AS_SSSE3
#include <linux/raid/pq.h>
#include "x86.h"
static int raid6_has_ssse3(void)
{
return boot_cpu_has(X86_FEATURE_XMM) &&
boot_cpu_has(X86_FEATURE_XMM2) &&
boot_cpu_has(X86_FEATURE_SSSE3);
}
static void raid6_2data_recov_ssse3(int disks, size_t bytes, int faila,
int failb, void **ptrs)
{
u8 *p, *q, *dp, *dq;
const u8 *pbmul; /* P multiplier table for B data */
const u8 *qmul; /* Q multiplier table (for both) */
static const u8 __aligned(16) x0f[16] = {
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f};
p = (u8 *)ptrs[disks-2];
q = (u8 *)ptrs[disks-1];
/* Compute syndrome with zero for the missing data pages
Use the dead data pages as temporary storage for
delta p and delta q */
dp = (u8 *)ptrs[faila];
ptrs[faila] = (void *)raid6_empty_zero_page;
ptrs[disks-2] = dp;
dq = (u8 *)ptrs[failb];
ptrs[failb] = (void *)raid6_empty_zero_page;
ptrs[disks-1] = dq;
raid6_call.gen_syndrome(disks, bytes, ptrs);
/* Restore pointer table */
ptrs[faila] = dp;
ptrs[failb] = dq;
ptrs[disks-2] = p;
ptrs[disks-1] = q;
/* Now, pick the proper data tables */
pbmul = raid6_vgfmul[raid6_gfexi[failb-faila]];
qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila] ^
raid6_gfexp[failb]]];
kernel_fpu_begin();
asm volatile("movdqa %0,%%xmm7" : : "m" (x0f[0]));
#ifdef CONFIG_X86_64
asm volatile("movdqa %0,%%xmm6" : : "m" (qmul[0]));
asm volatile("movdqa %0,%%xmm14" : : "m" (pbmul[0]));
asm volatile("movdqa %0,%%xmm15" : : "m" (pbmul[16]));
#endif
/* Now do it... */
while (bytes) {
#ifdef CONFIG_X86_64
/* xmm6, xmm14, xmm15 */
asm volatile("movdqa %0,%%xmm1" : : "m" (q[0]));
asm volatile("movdqa %0,%%xmm9" : : "m" (q[16]));
asm volatile("movdqa %0,%%xmm0" : : "m" (p[0]));
asm volatile("movdqa %0,%%xmm8" : : "m" (p[16]));
asm volatile("pxor %0,%%xmm1" : : "m" (dq[0]));
asm volatile("pxor %0,%%xmm9" : : "m" (dq[16]));
asm volatile("pxor %0,%%xmm0" : : "m" (dp[0]));
asm volatile("pxor %0,%%xmm8" : : "m" (dp[16]));
/* xmm0/8 = px */
asm volatile("movdqa %xmm6,%xmm4");
asm volatile("movdqa %0,%%xmm5" : : "m" (qmul[16]));
asm volatile("movdqa %xmm6,%xmm12");
asm volatile("movdqa %xmm5,%xmm13");
asm volatile("movdqa %xmm1,%xmm3");
asm volatile("movdqa %xmm9,%xmm11");
asm volatile("movdqa %xmm0,%xmm2"); /* xmm2/10 = px */
asm volatile("movdqa %xmm8,%xmm10");
asm volatile("psraw $4,%xmm1");
asm volatile("psraw $4,%xmm9");
asm volatile("pand %xmm7,%xmm3");
asm volatile("pand %xmm7,%xmm11");
asm volatile("pand %xmm7,%xmm1");
asm volatile("pand %xmm7,%xmm9");
asm volatile("pshufb %xmm3,%xmm4");
asm volatile("pshufb %xmm11,%xmm12");
asm volatile("pshufb %xmm1,%xmm5");
asm volatile("pshufb %xmm9,%xmm13");
asm volatile("pxor %xmm4,%xmm5");
asm volatile("pxor %xmm12,%xmm13");
/* xmm5/13 = qx */
asm volatile("movdqa %xmm14,%xmm4");
asm volatile("movdqa %xmm15,%xmm1");
asm volatile("movdqa %xmm14,%xmm12");
asm volatile("movdqa %xmm15,%xmm9");
asm volatile("movdqa %xmm2,%xmm3");
asm volatile("movdqa %xmm10,%xmm11");
asm volatile("psraw $4,%xmm2");
asm volatile("psraw $4,%xmm10");
asm volatile("pand %xmm7,%xmm3");
asm volatile("pand %xmm7,%xmm11");
asm volatile("pand %xmm7,%xmm2");
asm volatile("pand %xmm7,%xmm10");
asm volatile("pshufb %xmm3,%xmm4");
asm volatile("pshufb %xmm11,%xmm12");
asm volatile("pshufb %xmm2,%xmm1");
asm volatile("pshufb %xmm10,%xmm9");
asm volatile("pxor %xmm4,%xmm1");
asm volatile("pxor %xmm12,%xmm9");
/* xmm1/9 = pbmul[px] */
asm volatile("pxor %xmm5,%xmm1");
asm volatile("pxor %xmm13,%xmm9");
/* xmm1/9 = db = DQ */
asm volatile("movdqa %%xmm1,%0" : "=m" (dq[0]));
asm volatile("movdqa %%xmm9,%0" : "=m" (dq[16]));
asm volatile("pxor %xmm1,%xmm0");
asm volatile("pxor %xmm9,%xmm8");
asm volatile("movdqa %%xmm0,%0" : "=m" (dp[0]));
asm volatile("movdqa %%xmm8,%0" : "=m" (dp[16]));
bytes -= 32;
p += 32;
q += 32;
dp += 32;
dq += 32;
#else
asm volatile("movdqa %0,%%xmm1" : : "m" (*q));
asm volatile("movdqa %0,%%xmm0" : : "m" (*p));
asm volatile("pxor %0,%%xmm1" : : "m" (*dq));
asm volatile("pxor %0,%%xmm0" : : "m" (*dp));
/* 1 = dq ^ q
* 0 = dp ^ p
*/
asm volatile("movdqa %0,%%xmm4" : : "m" (qmul[0]));
asm volatile("movdqa %0,%%xmm5" : : "m" (qmul[16]));
asm volatile("movdqa %xmm1,%xmm3");
asm volatile("psraw $4,%xmm1");
asm volatile("pand %xmm7,%xmm3");
asm volatile("pand %xmm7,%xmm1");
asm volatile("pshufb %xmm3,%xmm4");
asm volatile("pshufb %xmm1,%xmm5");
asm volatile("pxor %xmm4,%xmm5");
asm volatile("movdqa %xmm0,%xmm2"); /* xmm2 = px */
/* xmm5 = qx */
asm volatile("movdqa %0,%%xmm4" : : "m" (pbmul[0]));
asm volatile("movdqa %0,%%xmm1" : : "m" (pbmul[16]));
asm volatile("movdqa %xmm2,%xmm3");
asm volatile("psraw $4,%xmm2");
asm volatile("pand %xmm7,%xmm3");
asm volatile("pand %xmm7,%xmm2");
asm volatile("pshufb %xmm3,%xmm4");
asm volatile("pshufb %xmm2,%xmm1");
asm volatile("pxor %xmm4,%xmm1");
/* xmm1 = pbmul[px] */
asm volatile("pxor %xmm5,%xmm1");
/* xmm1 = db = DQ */
asm volatile("movdqa %%xmm1,%0" : "=m" (*dq));
asm volatile("pxor %xmm1,%xmm0");
asm volatile("movdqa %%xmm0,%0" : "=m" (*dp));
bytes -= 16;
p += 16;
q += 16;
dp += 16;
dq += 16;
#endif
}
kernel_fpu_end();
}
static void raid6_datap_recov_ssse3(int disks, size_t bytes, int faila,
void **ptrs)
{
u8 *p, *q, *dq;
const u8 *qmul; /* Q multiplier table */
static const u8 __aligned(16) x0f[16] = {
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f};
p = (u8 *)ptrs[disks-2];
q = (u8 *)ptrs[disks-1];
/* Compute syndrome with zero for the missing data page
Use the dead data page as temporary storage for delta q */
dq = (u8 *)ptrs[faila];
ptrs[faila] = (void *)raid6_empty_zero_page;
ptrs[disks-1] = dq;
raid6_call.gen_syndrome(disks, bytes, ptrs);
/* Restore pointer table */
ptrs[faila] = dq;
ptrs[disks-1] = q;
/* Now, pick the proper data tables */
qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila]]];
kernel_fpu_begin();
asm volatile("movdqa %0, %%xmm7" : : "m" (x0f[0]));
while (bytes) {
#ifdef CONFIG_X86_64
asm volatile("movdqa %0, %%xmm3" : : "m" (dq[0]));
asm volatile("movdqa %0, %%xmm4" : : "m" (dq[16]));
asm volatile("pxor %0, %%xmm3" : : "m" (q[0]));
asm volatile("movdqa %0, %%xmm0" : : "m" (qmul[0]));
/* xmm3 = q[0] ^ dq[0] */
asm volatile("pxor %0, %%xmm4" : : "m" (q[16]));
asm volatile("movdqa %0, %%xmm1" : : "m" (qmul[16]));
/* xmm4 = q[16] ^ dq[16] */
asm volatile("movdqa %xmm3, %xmm6");
asm volatile("movdqa %xmm4, %xmm8");
/* xmm4 = xmm8 = q[16] ^ dq[16] */
asm volatile("psraw $4, %xmm3");
asm volatile("pand %xmm7, %xmm6");
asm volatile("pand %xmm7, %xmm3");
asm volatile("pshufb %xmm6, %xmm0");
asm volatile("pshufb %xmm3, %xmm1");
asm volatile("movdqa %0, %%xmm10" : : "m" (qmul[0]));
asm volatile("pxor %xmm0, %xmm1");
asm volatile("movdqa %0, %%xmm11" : : "m" (qmul[16]));
/* xmm1 = qmul[q[0] ^ dq[0]] */
asm volatile("psraw $4, %xmm4");
asm volatile("pand %xmm7, %xmm8");
asm volatile("pand %xmm7, %xmm4");
asm volatile("pshufb %xmm8, %xmm10");
asm volatile("pshufb %xmm4, %xmm11");
asm volatile("movdqa %0, %%xmm2" : : "m" (p[0]));
asm volatile("pxor %xmm10, %xmm11");
asm volatile("movdqa %0, %%xmm12" : : "m" (p[16]));
/* xmm11 = qmul[q[16] ^ dq[16]] */
asm volatile("pxor %xmm1, %xmm2");
/* xmm2 = p[0] ^ qmul[q[0] ^ dq[0]] */
asm volatile("pxor %xmm11, %xmm12");
/* xmm12 = p[16] ^ qmul[q[16] ^ dq[16]] */
asm volatile("movdqa %%xmm1, %0" : "=m" (dq[0]));
asm volatile("movdqa %%xmm11, %0" : "=m" (dq[16]));
asm volatile("movdqa %%xmm2, %0" : "=m" (p[0]));
asm volatile("movdqa %%xmm12, %0" : "=m" (p[16]));
bytes -= 32;
p += 32;
q += 32;
dq += 32;
#else
asm volatile("movdqa %0, %%xmm3" : : "m" (dq[0]));
asm volatile("movdqa %0, %%xmm0" : : "m" (qmul[0]));
asm volatile("pxor %0, %%xmm3" : : "m" (q[0]));
asm volatile("movdqa %0, %%xmm1" : : "m" (qmul[16]));
/* xmm3 = *q ^ *dq */
asm volatile("movdqa %xmm3, %xmm6");
asm volatile("movdqa %0, %%xmm2" : : "m" (p[0]));
asm volatile("psraw $4, %xmm3");
asm volatile("pand %xmm7, %xmm6");
asm volatile("pand %xmm7, %xmm3");
asm volatile("pshufb %xmm6, %xmm0");
asm volatile("pshufb %xmm3, %xmm1");
asm volatile("pxor %xmm0, %xmm1");
/* xmm1 = qmul[*q ^ *dq */
asm volatile("pxor %xmm1, %xmm2");
/* xmm2 = *p ^ qmul[*q ^ *dq] */
asm volatile("movdqa %%xmm1, %0" : "=m" (dq[0]));
asm volatile("movdqa %%xmm2, %0" : "=m" (p[0]));
bytes -= 16;
p += 16;
q += 16;
dq += 16;
#endif
}
kernel_fpu_end();
}
const struct raid6_recov_calls raid6_recov_ssse3 = {
.data2 = raid6_2data_recov_ssse3,
.datap = raid6_datap_recov_ssse3,
.valid = raid6_has_ssse3,
#ifdef CONFIG_X86_64
.name = "ssse3x2",
#else
.name = "ssse3x1",
#endif
.priority = 1,
};
#else
#warning "your version of binutils lacks SSSE3 support"
#endif
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