1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Copyright (C) 2017 Linaro Ltd. <ard.biesheuvel@linaro.org> 4 */ 5 6#ifndef __ASM_SIMD_H 7#define __ASM_SIMD_H 8 9#include <linux/compiler.h> 10#include <linux/irqflags.h> 11#include <linux/percpu.h> 12#include <linux/preempt.h> 13#include <linux/types.h> 14 15#ifdef CONFIG_KERNEL_MODE_NEON 16 17/* 18 * may_use_simd - whether it is allowable at this time to issue SIMD 19 * instructions or access the SIMD register file 20 * 21 * Callers must not assume that the result remains true beyond the next 22 * preempt_enable() or return from softirq context. 23 */ 24static __must_check inline bool may_use_simd(void) 25{ 26 /* 27 * We must make sure that the SVE has been initialized properly 28 * before using the SIMD in kernel. 29 */ 30 return !WARN_ON(!system_capabilities_finalized()) && 31 system_supports_fpsimd() && 32 !in_hardirq() && !irqs_disabled() && !in_nmi(); 33} 34 35#else /* ! CONFIG_KERNEL_MODE_NEON */ 36 37static __must_check inline bool may_use_simd(void) { 38 return false; 39} 40 41#endif /* ! CONFIG_KERNEL_MODE_NEON */ 42 43#endif 44