1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * linux/lib/raid6/neon.c - RAID6 syndrome calculation using ARM NEON intrinsics |
4 | * |
5 | * Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org> |
6 | */ |
7 | |
8 | #include <linux/raid/pq.h> |
9 | |
10 | #ifdef __KERNEL__ |
11 | #include <asm/neon.h> |
12 | #else |
13 | #define kernel_neon_begin() |
14 | #define kernel_neon_end() |
15 | #define cpu_has_neon() (1) |
16 | #endif |
17 | |
18 | /* |
19 | * There are 2 reasons these wrappers are kept in a separate compilation unit |
20 | * from the actual implementations in neonN.c (generated from neon.uc by |
21 | * unroll.awk): |
22 | * - the actual implementations use NEON intrinsics, and the GCC support header |
23 | * (arm_neon.h) is not fully compatible (type wise) with the kernel; |
24 | * - the neonN.c files are compiled with -mfpu=neon and optimization enabled, |
25 | * and we have to make sure that we never use *any* NEON/VFP instructions |
26 | * outside a kernel_neon_begin()/kernel_neon_end() pair. |
27 | */ |
28 | |
29 | #define RAID6_NEON_WRAPPER(_n) \ |
30 | static void raid6_neon ## _n ## _gen_syndrome(int disks, \ |
31 | size_t bytes, void **ptrs) \ |
32 | { \ |
33 | void raid6_neon ## _n ## _gen_syndrome_real(int, \ |
34 | unsigned long, void**); \ |
35 | kernel_neon_begin(); \ |
36 | raid6_neon ## _n ## _gen_syndrome_real(disks, \ |
37 | (unsigned long)bytes, ptrs); \ |
38 | kernel_neon_end(); \ |
39 | } \ |
40 | static void raid6_neon ## _n ## _xor_syndrome(int disks, \ |
41 | int start, int stop, \ |
42 | size_t bytes, void **ptrs) \ |
43 | { \ |
44 | void raid6_neon ## _n ## _xor_syndrome_real(int, \ |
45 | int, int, unsigned long, void**); \ |
46 | kernel_neon_begin(); \ |
47 | raid6_neon ## _n ## _xor_syndrome_real(disks, \ |
48 | start, stop, (unsigned long)bytes, ptrs); \ |
49 | kernel_neon_end(); \ |
50 | } \ |
51 | struct raid6_calls const raid6_neonx ## _n = { \ |
52 | raid6_neon ## _n ## _gen_syndrome, \ |
53 | raid6_neon ## _n ## _xor_syndrome, \ |
54 | raid6_have_neon, \ |
55 | "neonx" #_n, \ |
56 | 0 \ |
57 | } |
58 | |
59 | static int raid6_have_neon(void) |
60 | { |
61 | return cpu_has_neon(); |
62 | } |
63 | |
64 | RAID6_NEON_WRAPPER(1); |
65 | RAID6_NEON_WRAPPER(2); |
66 | RAID6_NEON_WRAPPER(4); |
67 | RAID6_NEON_WRAPPER(8); |
68 | |