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
62static int raid6_have_neon(void)
63{
64	return cpu_has_neon();
65}
66
67RAID6_NEON_WRAPPER(1);
68RAID6_NEON_WRAPPER(2);
69RAID6_NEON_WRAPPER(4);
70RAID6_NEON_WRAPPER(8);

 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
59static int raid6_have_neon(void)
60{
61	return cpu_has_neon();
62}
63
64RAID6_NEON_WRAPPER(1);
65RAID6_NEON_WRAPPER(2);
66RAID6_NEON_WRAPPER(4);
67RAID6_NEON_WRAPPER(8);