// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2012 Intel Corporation
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* Copyright (C) 2017 Linaro Ltd. <ard.biesheuvel@linaro.org>
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*/
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#include <linux/raid/pq.h>
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#ifdef __KERNEL__
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#include <asm/neon.h>
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#else
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#define kernel_neon_begin()
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#define kernel_neon_end()
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#define cpu_has_neon() (1)
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#endif
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static int raid6_has_neon(void)
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{
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return cpu_has_neon();
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}
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void __raid6_2data_recov_neon(int bytes, uint8_t *p, uint8_t *q, uint8_t *dp,
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uint8_t *dq, const uint8_t *pbmul,
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const uint8_t *qmul);
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void __raid6_datap_recov_neon(int bytes, uint8_t *p, uint8_t *q, uint8_t *dq,
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const uint8_t *qmul);
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static void raid6_2data_recov_neon(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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p = (u8 *)ptrs[disks - 2];
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q = (u8 *)ptrs[disks - 1];
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/*
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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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*/
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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_neon_begin();
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__raid6_2data_recov_neon(bytes, p, q, dp, dq, pbmul, qmul);
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kernel_neon_end();
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}
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static void raid6_datap_recov_neon(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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p = (u8 *)ptrs[disks - 2];
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q = (u8 *)ptrs[disks - 1];
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/*
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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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*/
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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_neon_begin();
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__raid6_datap_recov_neon(bytes, p, q, dq, qmul);
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kernel_neon_end();
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}
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const struct raid6_recov_calls raid6_recov_neon = {
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.data2 = raid6_2data_recov_neon,
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.datap = raid6_datap_recov_neon,
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.valid = raid6_has_neon,
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.name = "neon",
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.priority = 10,
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};
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