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7b89149c9f
This patch adds check for `kernel_neon_*` symbols on arm and arm64 platforms to address the following issues: 1. Linux 6.2+ on arm64 has exported them with `EXPORT_SYMBOL_GPL`, so license compatibility must be checked before use. 2. On both arm and arm64, the definitions of these symbols are guarded by `CONFIG_KERNEL_MODE_NEON`, but their declarations are still present. Checking in configuration phase only leads to MODPOST errors (undefined references). Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Shengqi Chen <harry-chen@outlook.com> Closes #15711 Closes #14555 Closes: #15401
87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (C) 2022 Tino Reichardt <milky-zfs@mcmilk.de>
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*/
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/*
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* USER API:
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*
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* Kernel fpu methods:
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* kfpu_allowed()
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* kfpu_begin()
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* kfpu_end()
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* kfpu_init()
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* kfpu_fini()
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*
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* SIMD support:
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*
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* Following functions should be called to determine whether CPU feature
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* is supported. All functions are usable in kernel and user space.
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* If a SIMD algorithm is using more than one instruction set
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* all relevant feature test functions should be called.
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*
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* Supported features:
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* zfs_neon_available()
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* zfs_sha256_available()
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*/
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#ifndef _LINUX_SIMD_ARM_H
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#define _LINUX_SIMD_ARM_H
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#include <sys/types.h>
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#include <asm/neon.h>
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#include <asm/elf.h>
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#include <asm/hwcap.h>
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#if (defined(HAVE_KERNEL_NEON) && defined(CONFIG_KERNEL_MODE_NEON))
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#define kfpu_allowed() 1
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#define kfpu_begin() kernel_neon_begin()
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#define kfpu_end() kernel_neon_end()
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#else
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#define kfpu_allowed() 0
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#define kfpu_begin() do {} while (0)
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#define kfpu_end() do {} while (0)
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#endif
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#define kfpu_init() (0)
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#define kfpu_fini() do {} while (0)
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/*
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* Check if NEON is available
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*/
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static inline boolean_t
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zfs_neon_available(void)
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{
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return (elf_hwcap & HWCAP_NEON);
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}
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/*
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* Check if SHA256 is available
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*/
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static inline boolean_t
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zfs_sha256_available(void)
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{
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return (elf_hwcap2 & HWCAP2_SHA2);
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}
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#endif /* _LINUX_SIMD_ARM_H */
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