1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012 Intel Corporation
4 * Copyright (C) 2017 Linaro Ltd. <ard.biesheuvel@linaro.org>
5 */
6
7 #include <linux/raid/pq.h>
8
9 #ifdef __KERNEL__
10 #include <asm/neon.h>
11 #include "neon.h"
12 #else
13 #define kernel_neon_begin()
14 #define kernel_neon_end()
15 #define cpu_has_neon() (1)
16 #endif
17
18 static int raid6_has_neon(void)
19 {
20 return cpu_has_neon();
21 }
22
23 static void raid6_2data_recov_neon(int disks, size_t bytes, int faila,
24 int failb, void **ptrs)
25 {
26 u8 *p, *q, *dp, *dq;
27 const u8 *pbmul; /* P multiplier table for B data */
28 const u8 *qmul; /* Q multiplier table (for both) */
29
30 p = (u8 *)ptrs[disks - 2];
31 q = (u8 *)ptrs[disks - 1];
32
33 /*
34 * Compute syndrome with zero for the missing data pages
35 * Use the dead data pages as temporary storage for
36 * delta p and delta q
37 */
38 dp = (u8 *)ptrs[faila];
39 ptrs[faila] = (void *)raid6_empty_zero_page;
40 ptrs[disks - 2] = dp;
41 dq = (u8 *)ptrs[failb];
42 ptrs[failb] = (void *)raid6_empty_zero_page;
43 ptrs[disks - 1] = dq;
44
45 raid6_call.gen_syndrome(disks, bytes, ptrs);
46
47 /* Restore pointer table */
48 ptrs[faila] = dp;
49 ptrs[failb] = dq;
50 ptrs[disks - 2] = p;
51 ptrs[disks - 1] = q;
52
53 /* Now, pick the proper data tables */
54 pbmul = raid6_vgfmul[raid6_gfexi[failb-faila]];
55 qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila] ^
56 raid6_gfexp[failb]]];
57
58 kernel_neon_begin();
59 __raid6_2data_recov_neon(bytes, p, q, dp, dq, pbmul, qmul);
60 kernel_neon_end();
61 }
62
63 static void raid6_datap_recov_neon(int disks, size_t bytes, int faila,
64 void **ptrs)
65 {
66 u8 *p, *q, *dq;
67 const u8 *qmul; /* Q multiplier table */
68
69 p = (u8 *)ptrs[disks - 2];
70 q = (u8 *)ptrs[disks - 1];
71
72 /*
73 * Compute syndrome with zero for the missing data page
74 * Use the dead data page as temporary storage for delta q
75 */
76 dq = (u8 *)ptrs[faila];
77 ptrs[faila] = (void *)raid6_empty_zero_page;
78 ptrs[disks - 1] = dq;
79
80 raid6_call.gen_syndrome(disks, bytes, ptrs);
81
82 /* Restore pointer table */
83 ptrs[faila] = dq;
84 ptrs[disks - 1] = q;
85
86 /* Now, pick the proper data tables */
87 qmul = raid6_vgfmul[raid6_gfinv[raid6_gfexp[faila]]];
88
89 kernel_neon_begin();
90 __raid6_datap_recov_neon(bytes, p, q, dq, qmul);
91 kernel_neon_end();
92 }
93
94 const struct raid6_recov_calls raid6_recov_neon = {
95 .data2 = raid6_2data_recov_neon,
96 .datap = raid6_datap_recov_neon,
97 .valid = raid6_has_neon,
98 .name = "neon",
99 .priority = 10,
100 };
101
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