// SPDX-License-Identifier: GPL-2.0-only
/*
* RAID6 recovery algorithms in LoongArch SIMD (LSX & LASX)
*
* Copyright (C) 2023 WANG Xuerui <[email protected]>
*
* Originally based on recov_avx2.c and recov_ssse3.c:
*
* Copyright (C) 2012 Intel Corporation
* Author: Jim Kukunas <[email protected]>
*/
#include <linux/raid/pq.h>
#include "loongarch.h"
/*
* Unlike with the syndrome calculation algorithms, there's no boot-time
* selection of recovery algorithms by benchmarking, so we have to specify
* the priorities and hope the future cores will all have decent vector
* support (i.e. no LASX slower than LSX, or even scalar code).
*/
#ifdef CONFIG_CPU_HAS_LSX
static int raid6_has_lsx(void)
{
return cpu_has_lsx;
}
static void raid6_2data_recov_lsx(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) */
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();
/*
* vr20, vr21: qmul
* vr22, vr23: pbmul
*/
asm volatile("vld $vr20, %0" : : "m" (qmul[0]));
asm volatile("vld $vr21, %0" : : "m" (qmul[16]));
asm volatile("vld $vr22, %0" : : "m" (pbmul[0]));
asm volatile("vld $vr23, %0" : : "m" (pbmul[16]));
while (bytes) {
/* vr4 - vr7: Q */
asm volatile("vld $vr4, %0" : : "m" (q[0]));
asm volatile("vld $vr5, %0" : : "m" (q[16]));
asm volatile("vld $vr6, %0" : : "m" (q[32]));
asm volatile("vld $vr7, %0" : : "m" (q[48]));
/* vr4 - vr7: Q + Qxy */
asm volatile("vld $vr8, %0" : : "m" (dq[0]));
asm volatile("vld $vr9, %0" : : "m" (dq[16]));
asm volatile("vld $vr10, %0" : : "m" (dq[32]));
asm volatile("vld $vr11, %0" : : "m" (dq[48]));
asm volatile("vxor.v $vr4, $vr4, $vr8");
asm volatile("vxor.v $vr5, $vr5, $vr9");
asm volatile("vxor.v $vr6, $vr6, $vr10");
asm volatile("vxor.v $vr7, $vr7, $vr11");
/* vr0 - vr3: P */
asm volatile("vld $vr0, %0" : : "m" (p[0]));
asm volatile("vld $vr1, %0" : : "m" (p[16]));
asm volatile("vld $vr2, %0" : : "m" (p[32]));
asm volatile("vld $vr3, %0" : : "m" (p[48]));
/* vr0 - vr3: P + Pxy */
asm volatile("vld $vr8, %0" : : "m" (dp[0]));
asm volatile("vld $vr9, %0" : : "m" (dp[16]));
asm volatile("vld $vr10, %0" : : "m" (dp[32]));
asm volatile("vld $vr11, %0" : : "m" (dp[48]));
asm volatile("vxor.v $vr0, $vr0, $vr8");
asm volatile("vxor.v $vr1, $vr1, $vr9");
asm volatile("vxor.v $vr2, $vr2, $vr10");
asm volatile("vxor.v $vr3, $vr3, $vr11");
/* vr8 - vr11: higher 4 bits of each byte of (Q + Qxy) */
asm volatile("vsrli.b $vr8, $vr4, 4");
asm volatile("vsrli.b $vr9, $vr5, 4");
asm volatile("vsrli.b $vr10, $vr6, 4");
asm volatile("vsrli.b $vr11, $vr7, 4");
/* vr4 - vr7: lower 4 bits of each byte of (Q + Qxy) */
asm volatile("vandi.b $vr4, $vr4, 0x0f");
asm volatile("vandi.b $vr5, $vr5, 0x0f");
asm volatile("vandi.b $vr6, $vr6, 0x0f");
asm volatile("vandi.b $vr7, $vr7, 0x0f");
/* lookup from qmul[0] */
asm volatile("vshuf.b $vr4, $vr20, $vr20, $vr4");
asm volatile("vshuf.b $vr5, $vr20, $vr20, $vr5");
asm volatile("vshuf.b $vr6, $vr20, $vr20, $vr6");
asm volatile("vshuf.b $vr7, $vr20, $vr20, $vr7");
/* lookup from qmul[16] */
asm volatile("vshuf.b $vr8, $vr21, $vr21, $vr8");
asm volatile("vshuf.b $vr9, $vr21, $vr21, $vr9");
asm volatile("vshuf.b $vr10, $vr21, $vr21, $vr10");
asm volatile("vshuf.b $vr11, $vr21, $vr21, $vr11");
/* vr16 - vr19: B(Q + Qxy) */
asm volatile("vxor.v $vr16, $vr8, $vr4");
asm volatile("vxor.v $vr17, $vr9, $vr5");
asm volatile("vxor.v $vr18, $vr10, $vr6");
asm volatile("vxor.v $vr19, $vr11, $vr7");
/* vr4 - vr7: higher 4 bits of each byte of (P + Pxy) */
asm volatile("vsrli.b $vr4, $vr0, 4");
asm volatile("vsrli.b $vr5, $vr1, 4");
asm volatile("vsrli.b $vr6, $vr2, 4");
asm volatile("vsrli.b $vr7, $vr3, 4");
/* vr12 - vr15: lower 4 bits of each byte of (P + Pxy) */
asm volatile("vandi.b $vr12, $vr0, 0x0f");
asm volatile("vandi.b $vr13, $vr1, 0x0f");
asm volatile("vandi.b $vr14, $vr2, 0x0f");
asm volatile("vandi.b $vr15, $vr3, 0x0f");
/* lookup from pbmul[0] */
asm volatile("vshuf.b $vr12, $vr22, $vr22, $vr12");
asm volatile("vshuf.b $vr13, $vr22, $vr22, $vr13");
asm volatile("vshuf.b $vr14, $vr22, $vr22, $vr14");
asm volatile("vshuf.b $vr15, $vr22, $vr22, $vr15");
/* lookup from pbmul[16] */
asm volatile("vshuf.b $vr4, $vr23, $vr23, $vr4");
asm volatile("vshuf.b $vr5, $vr23, $vr23, $vr5");
asm volatile("vshuf.b $vr6, $vr23, $vr23, $vr6");
asm volatile("vshuf.b $vr7, $vr23, $vr23, $vr7");
/* vr4 - vr7: A(P + Pxy) */
asm volatile("vxor.v $vr4, $vr4, $vr12");
asm volatile("vxor.v $vr5, $vr5, $vr13");
asm volatile("vxor.v $vr6, $vr6, $vr14");
asm volatile("vxor.v $vr7, $vr7, $vr15");
/* vr4 - vr7: A(P + Pxy) + B(Q + Qxy) = Dx */
asm volatile("vxor.v $vr4, $vr4, $vr16");
asm volatile("vxor.v $vr5, $vr5, $vr17");
asm volatile("vxor.v $vr6, $vr6, $vr18");
asm volatile("vxor.v $vr7, $vr7, $vr19");
asm volatile("vst $vr4, %0" : "=m" (dq[0]));
asm volatile("vst $vr5, %0" : "=m" (dq[16]));
asm volatile("vst $vr6, %0" : "=m" (dq[32]));
asm volatile("vst $vr7, %0" : "=m" (dq[48]));
/* vr0 - vr3: P + Pxy + Dx = Dy */
asm volatile("vxor.v $vr0, $vr0, $vr4");
asm volatile("vxor.v $vr1, $vr1, $vr5");
asm volatile("vxor.v $vr2, $vr2, $vr6");
asm volatile("vxor.v $vr3, $vr3, $vr7");
asm volatile("vst $vr0, %0" : "=m" (dp[0]));
asm volatile("vst $vr1, %0" : "=m" (dp[16]));
asm volatile("vst $vr2, %0" : "=m" (dp[32]));
asm volatile("vst $vr3, %0" : "=m" (dp[48]));
bytes -= 64;
p += 64;
q += 64;
dp += 64;
dq += 64;
}
kernel_fpu_end();
}
static void raid6_datap_recov_lsx(int disks, size_t bytes, int faila,
void **ptrs)
{
u8 *p, *q, *dq;
const u8 *qmul; /* Q multiplier table */
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();
/* vr22, vr23: qmul */
asm volatile("vld $vr22, %0" : : "m" (qmul[0]));
asm volatile("vld $vr23, %0" : : "m" (qmul[16]));
while (bytes) {
/* vr0 - vr3: P + Dx */
asm volatile("vld $vr0, %0" : : "m" (p[0]));
asm volatile("vld $vr1, %0" : : "m" (p[16]));
asm volatile("vld $vr2, %0" : : "m" (p[32]));
asm volatile("vld $vr3, %0" : : "m" (p[48]));
/* vr4 - vr7: Qx */
asm volatile("vld $vr4, %0" : : "m" (dq[0]));
asm volatile("vld $vr5, %0" : : "m" (dq[16]));
asm volatile("vld $vr6, %0" : : "m" (dq[32]));
asm volatile("vld $vr7, %0" : : "m" (dq[48]));
/* vr4 - vr7: Q + Qx */
asm volatile("vld $vr8, %0" : : "m" (q[0]));
asm volatile("vld $vr9, %0" : : "m" (q[16]));
asm volatile("vld $vr10, %0" : : "m" (q[32]));
asm volatile("vld $vr11, %0" : : "m" (q[48]));
asm volatile("vxor.v $vr4, $vr4, $vr8");
asm volatile("vxor.v $vr5, $vr5, $vr9");
asm volatile("vxor.v $vr6, $vr6, $vr10");
asm volatile("vxor.v $vr7, $vr7, $vr11");
/* vr8 - vr11: higher 4 bits of each byte of (Q + Qx) */
asm volatile("vsrli.b $vr8, $vr4, 4");
asm volatile("vsrli.b $vr9, $vr5, 4");
asm volatile("vsrli.b $vr10, $vr6, 4");
asm volatile("vsrli.b $vr11, $vr7, 4");
/* vr4 - vr7: lower 4 bits of each byte of (Q + Qx) */
asm volatile("vandi.b $vr4, $vr4, 0x0f");
asm volatile("vandi.b $vr5, $vr5, 0x0f");
asm volatile("vandi.b $vr6, $vr6, 0x0f");
asm volatile("vandi.b $vr7, $vr7, 0x0f");
/* lookup from qmul[0] */
asm volatile("vshuf.b $vr4, $vr22, $vr22, $vr4");
asm volatile("vshuf.b $vr5, $vr22, $vr22, $vr5");
asm volatile("vshuf.b $vr6, $vr22, $vr22, $vr6");
asm volatile("vshuf.b $vr7, $vr22, $vr22, $vr7");
/* lookup from qmul[16] */
asm volatile("vshuf.b $vr8, $vr23, $vr23, $vr8");
asm volatile("vshuf.b $vr9, $vr23, $vr23, $vr9");
asm volatile("vshuf.b $vr10, $vr23, $vr23, $vr10");
asm volatile("vshuf.b $vr11, $vr23, $vr23, $vr11");
/* vr4 - vr7: qmul(Q + Qx) = Dx */
asm volatile("vxor.v $vr4, $vr4, $vr8");
asm volatile("vxor.v $vr5, $vr5, $vr9");
asm volatile("vxor.v $vr6, $vr6, $vr10");
asm volatile("vxor.v $vr7, $vr7, $vr11");
asm volatile("vst $vr4, %0" : "=m" (dq[0]));
asm volatile("vst $vr5, %0" : "=m" (dq[16]));
asm volatile("vst $vr6, %0" : "=m" (dq[32]));
asm volatile("vst $vr7, %0" : "=m" (dq[48]));
/* vr0 - vr3: P + Dx + Dx = P */
asm volatile("vxor.v $vr0, $vr0, $vr4");
asm volatile("vxor.v $vr1, $vr1, $vr5");
asm volatile("vxor.v $vr2, $vr2, $vr6");
asm volatile("vxor.v $vr3, $vr3, $vr7");
asm volatile("vst $vr0, %0" : "=m" (p[0]));
asm volatile("vst $vr1, %0" : "=m" (p[16]));
asm volatile("vst $vr2, %0" : "=m" (p[32]));
asm volatile("vst $vr3, %0" : "=m" (p[48]));
bytes -= 64;
p += 64;
q += 64;
dq += 64;
}
kernel_fpu_end();
}
const struct raid6_recov_calls raid6_recov_lsx = {
.data2 = raid6_2data_recov_lsx,
.datap = raid6_datap_recov_lsx,
.valid = raid6_has_lsx,
.name = "lsx",
.priority = 1,
};
#endif /* CONFIG_CPU_HAS_LSX */
#ifdef CONFIG_CPU_HAS_LASX
static int raid6_has_lasx(void)
{
return cpu_has_lasx;
}
static void raid6_2data_recov_lasx(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) */
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();
/*
* xr20, xr21: qmul
* xr22, xr23: pbmul
*/
asm volatile("vld $vr20, %0" : : "m" (qmul[0]));
asm volatile("vld $vr21, %0" : : "m" (qmul[16]));
asm volatile("vld $vr22, %0" : : "m" (pbmul[0]));
asm volatile("vld $vr23, %0" : : "m" (pbmul[16]));
asm volatile("xvreplve0.q $xr20, $xr20");
asm volatile("xvreplve0.q $xr21, $xr21");
asm volatile("xvreplve0.q $xr22, $xr22");
asm volatile("xvreplve0.q $xr23, $xr23");
while (bytes) {
/* xr0, xr1: Q */
asm volatile("xvld $xr0, %0" : : "m" (q[0]));
asm volatile("xvld $xr1, %0" : : "m" (q[32]));
/* xr0, xr1: Q + Qxy */
asm volatile("xvld $xr4, %0" : : "m" (dq[0]));
asm volatile("xvld $xr5, %0" : : "m" (dq[32]));
asm volatile("xvxor.v $xr0, $xr0, $xr4");
asm volatile("xvxor.v $xr1, $xr1, $xr5");
/* xr2, xr3: P */
asm volatile("xvld $xr2, %0" : : "m" (p[0]));
asm volatile("xvld $xr3, %0" : : "m" (p[32]));
/* xr2, xr3: P + Pxy */
asm volatile("xvld $xr4, %0" : : "m" (dp[0]));
asm volatile("xvld $xr5, %0" : : "m" (dp[32]));
asm volatile("xvxor.v $xr2, $xr2, $xr4");
asm volatile("xvxor.v $xr3, $xr3, $xr5");
/* xr4, xr5: higher 4 bits of each byte of (Q + Qxy) */
asm volatile("xvsrli.b $xr4, $xr0, 4");
asm volatile("xvsrli.b $xr5, $xr1, 4");
/* xr0, xr1: lower 4 bits of each byte of (Q + Qxy) */
asm volatile("xvandi.b $xr0, $xr0, 0x0f");
asm volatile("xvandi.b $xr1, $xr1, 0x0f");
/* lookup from qmul[0] */
asm volatile("xvshuf.b $xr0, $xr20, $xr20, $xr0");
asm volatile("xvshuf.b $xr1, $xr20, $xr20, $xr1");
/* lookup from qmul[16] */
asm volatile("xvshuf.b $xr4, $xr21, $xr21, $xr4");
asm volatile("xvshuf.b $xr5, $xr21, $xr21, $xr5");
/* xr6, xr7: B(Q + Qxy) */
asm volatile("xvxor.v $xr6, $xr4, $xr0");
asm volatile("xvxor.v $xr7, $xr5, $xr1");
/* xr4, xr5: higher 4 bits of each byte of (P + Pxy) */
asm volatile("xvsrli.b $xr4, $xr2, 4");
asm volatile("xvsrli.b $xr5, $xr3, 4");
/* xr0, xr1: lower 4 bits of each byte of (P + Pxy) */
asm volatile("xvandi.b $xr0, $xr2, 0x0f");
asm volatile("xvandi.b $xr1, $xr3, 0x0f");
/* lookup from pbmul[0] */
asm volatile("xvshuf.b $xr0, $xr22, $xr22, $xr0");
asm volatile("xvshuf.b $xr1, $xr22, $xr22, $xr1");
/* lookup from pbmul[16] */
asm volatile("xvshuf.b $xr4, $xr23, $xr23, $xr4");
asm volatile("xvshuf.b $xr5, $xr23, $xr23, $xr5");
/* xr0, xr1: A(P + Pxy) */
asm volatile("xvxor.v $xr0, $xr0, $xr4");
asm volatile("xvxor.v $xr1, $xr1, $xr5");
/* xr0, xr1: A(P + Pxy) + B(Q + Qxy) = Dx */
asm volatile("xvxor.v $xr0, $xr0, $xr6");
asm volatile("xvxor.v $xr1, $xr1, $xr7");
/* xr2, xr3: P + Pxy + Dx = Dy */
asm volatile("xvxor.v $xr2, $xr2, $xr0");
asm volatile("xvxor.v $xr3, $xr3, $xr1");
asm volatile("xvst $xr0, %0" : "=m" (dq[0]));
asm volatile("xvst $xr1, %0" : "=m" (dq[32]));
asm volatile("xvst $xr2, %0" : "=m" (dp[0]));
asm volatile("xvst $xr3, %0" : "=m" (dp[32]));
bytes -= 64;
p += 64;
q += 64;
dp += 64;
dq += 64;
}
kernel_fpu_end();
}
static void raid6_datap_recov_lasx(int disks, size_t bytes, int faila,
void **ptrs)
{
u8 *p, *q, *dq;
const u8 *qmul; /* Q multiplier table */
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();
/* xr22, xr23: qmul */
asm volatile("vld $vr22, %0" : : "m" (qmul[0]));
asm volatile("xvreplve0.q $xr22, $xr22");
asm volatile("vld $vr23, %0" : : "m" (qmul[16]));
asm volatile("xvreplve0.q $xr23, $xr23");
while (bytes) {
/* xr0, xr1: P + Dx */
asm volatile("xvld $xr0, %0" : : "m" (p[0]));
asm volatile("xvld $xr1, %0" : : "m" (p[32]));
/* xr2, xr3: Qx */
asm volatile("xvld $xr2, %0" : : "m" (dq[0]));
asm volatile("xvld $xr3, %0" : : "m" (dq[32]));
/* xr2, xr3: Q + Qx */
asm volatile("xvld $xr4, %0" : : "m" (q[0]));
asm volatile("xvld $xr5, %0" : : "m" (q[32]));
asm volatile("xvxor.v $xr2, $xr2, $xr4");
asm volatile("xvxor.v $xr3, $xr3, $xr5");
/* xr4, xr5: higher 4 bits of each byte of (Q + Qx) */
asm volatile("xvsrli.b $xr4, $xr2, 4");
asm volatile("xvsrli.b $xr5, $xr3, 4");
/* xr2, xr3: lower 4 bits of each byte of (Q + Qx) */
asm volatile("xvandi.b $xr2, $xr2, 0x0f");
asm volatile("xvandi.b $xr3, $xr3, 0x0f");
/* lookup from qmul[0] */
asm volatile("xvshuf.b $xr2, $xr22, $xr22, $xr2");
asm volatile("xvshuf.b $xr3, $xr22, $xr22, $xr3");
/* lookup from qmul[16] */
asm volatile("xvshuf.b $xr4, $xr23, $xr23, $xr4");
asm volatile("xvshuf.b $xr5, $xr23, $xr23, $xr5");
/* xr2, xr3: qmul(Q + Qx) = Dx */
asm volatile("xvxor.v $xr2, $xr2, $xr4");
asm volatile("xvxor.v $xr3, $xr3, $xr5");
/* xr0, xr1: P + Dx + Dx = P */
asm volatile("xvxor.v $xr0, $xr0, $xr2");
asm volatile("xvxor.v $xr1, $xr1, $xr3");
asm volatile("xvst $xr2, %0" : "=m" (dq[0]));
asm volatile("xvst $xr3, %0" : "=m" (dq[32]));
asm volatile("xvst $xr0, %0" : "=m" (p[0]));
asm volatile("xvst $xr1, %0" : "=m" (p[32]));
bytes -= 64;
p += 64;
q += 64;
dq += 64;
}
kernel_fpu_end();
}
const struct raid6_recov_calls raid6_recov_lasx = {
.data2 = raid6_2data_recov_lasx,
.datap = raid6_datap_recov_lasx,
.valid = raid6_has_lasx,
.name = "lasx",
.priority = 2,
};
#endif /* CONFIG_CPU_HAS_LASX */
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