mirror of https://github.com/torvalds/linux.git
54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (C) 2017 Linaro Ltd. <ard.biesheuvel@linaro.org>
|
|
*/
|
|
|
|
#ifndef __ASM_SIMD_H
|
|
#define __ASM_SIMD_H
|
|
|
|
#include <linux/cleanup.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/irqflags.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/preempt.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <asm/neon.h>
|
|
|
|
#ifdef CONFIG_KERNEL_MODE_NEON
|
|
|
|
/*
|
|
* may_use_simd - whether it is allowable at this time to issue SIMD
|
|
* instructions or access the SIMD register file
|
|
*
|
|
* Callers must not assume that the result remains true beyond the next
|
|
* preempt_enable() or return from softirq context.
|
|
*/
|
|
static __must_check inline bool may_use_simd(void)
|
|
{
|
|
/*
|
|
* We must make sure that the SVE has been initialized properly
|
|
* before using the SIMD in kernel.
|
|
*/
|
|
return !WARN_ON(!system_capabilities_finalized()) &&
|
|
system_supports_fpsimd() &&
|
|
!in_hardirq() && !in_nmi();
|
|
}
|
|
|
|
#else /* ! CONFIG_KERNEL_MODE_NEON */
|
|
|
|
static __must_check inline bool may_use_simd(void) {
|
|
return false;
|
|
}
|
|
|
|
#endif /* ! CONFIG_KERNEL_MODE_NEON */
|
|
|
|
DEFINE_LOCK_GUARD_1(ksimd,
|
|
struct user_fpsimd_state,
|
|
kernel_neon_begin(_T->lock),
|
|
kernel_neon_end(_T->lock))
|
|
|
|
#define scoped_ksimd() scoped_guard(ksimd, &(struct user_fpsimd_state){})
|
|
|
|
#endif
|