| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/lib/raid6/neon.c - RAID6 syndrome calculation using ARM NEON intrinsics |
| 3 | * |
| 4 | * Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/raid/pq.h> |
| 12 | |
| 13 | #ifdef __KERNEL__ |
| 14 | #include <asm/neon.h> |
| 15 | #else |
| 16 | #define kernel_neon_begin() |
| 17 | #define kernel_neon_end() |
| 18 | #define cpu_has_neon() (1) |
| 19 | #endif |
| 20 | |
| 21 | /* |
| 22 | * There are 2 reasons these wrappers are kept in a separate compilation unit |
| 23 | * from the actual implementations in neonN.c (generated from neon.uc by |
| 24 | * unroll.awk): |
| 25 | * - the actual implementations use NEON intrinsics, and the GCC support header |
| 26 | * (arm_neon.h) is not fully compatible (type wise) with the kernel; |
| 27 | * - the neonN.c files are compiled with -mfpu=neon and optimization enabled, |
| 28 | * and we have to make sure that we never use *any* NEON/VFP instructions |
| 29 | * outside a kernel_neon_begin()/kernel_neon_end() pair. |
| 30 | */ |
| 31 | |
| 32 | #define RAID6_NEON_WRAPPER(_n) \ |
| 33 | static void raid6_neon ## _n ## _gen_syndrome(int disks, \ |
| 34 | size_t bytes, void **ptrs) \ |
| 35 | { \ |
| 36 | void raid6_neon ## _n ## _gen_syndrome_real(int, \ |
| 37 | unsigned long, void**); \ |
| 38 | kernel_neon_begin(); \ |
| 39 | raid6_neon ## _n ## _gen_syndrome_real(disks, \ |
| 40 | (unsigned long)bytes, ptrs); \ |
| 41 | kernel_neon_end(); \ |
| 42 | } \ |
| 43 | static void raid6_neon ## _n ## _xor_syndrome(int disks, \ |
| 44 | int start, int stop, \ |
| 45 | size_t bytes, void **ptrs) \ |
| 46 | { \ |
| 47 | void raid6_neon ## _n ## _xor_syndrome_real(int, \ |
| 48 | int, int, unsigned long, void**); \ |
| 49 | kernel_neon_begin(); \ |
| 50 | raid6_neon ## _n ## _xor_syndrome_real(disks, \ |
| 51 | start, stop, (unsigned long)bytes, ptrs); \ |
| 52 | kernel_neon_end(); \ |
| 53 | } \ |
| 54 | struct raid6_calls const raid6_neonx ## _n = { \ |
| 55 | raid6_neon ## _n ## _gen_syndrome, \ |
| 56 | raid6_neon ## _n ## _xor_syndrome, \ |
| 57 | raid6_have_neon, \ |
| 58 | "neonx" #_n, \ |
| 59 | 0 \ |
| 60 | } |
| 61 | |
| 62 | static int raid6_have_neon(void) |
| 63 | { |
| 64 | return cpu_has_neon(); |
| 65 | } |
| 66 | |
| 67 | RAID6_NEON_WRAPPER(1); |
| 68 | RAID6_NEON_WRAPPER(2); |
| 69 | RAID6_NEON_WRAPPER(4); |
| 70 | RAID6_NEON_WRAPPER(8); |