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71 lines
1.4 KiB
71 lines
1.4 KiB
3 years ago
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#ifndef _WG_SIMD_H
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#define _WG_SIMD_H
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#include <linux/sched.h>
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#include <asm/simd.h>
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#if defined(CONFIG_X86_64)
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#include <linux/version.h>
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#include <asm/fpu/api.h>
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#elif defined(CONFIG_KERNEL_MODE_NEON)
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#include <asm/neon.h>
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#endif
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typedef enum {
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HAVE_NO_SIMD = 1 << 0,
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HAVE_FULL_SIMD = 1 << 1,
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HAVE_SIMD_IN_USE = 1 << 31
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} simd_context_t;
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#define DONT_USE_SIMD ((simd_context_t []){ HAVE_NO_SIMD })
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static inline void simd_get(simd_context_t *ctx)
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{
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*ctx = !IS_ENABLED(CONFIG_PREEMPT_RT_BASE) && may_use_simd() ? HAVE_FULL_SIMD : HAVE_NO_SIMD;
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}
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static inline void simd_put(simd_context_t *ctx)
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{
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#if defined(CONFIG_X86_64)
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if (*ctx & HAVE_SIMD_IN_USE)
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kernel_fpu_end();
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#elif defined(CONFIG_KERNEL_MODE_NEON)
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if (*ctx & HAVE_SIMD_IN_USE)
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kernel_neon_end();
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#endif
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*ctx = HAVE_NO_SIMD;
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}
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static inline bool simd_relax(simd_context_t *ctx)
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{
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#ifdef CONFIG_PREEMPT
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if ((*ctx & HAVE_SIMD_IN_USE) && need_resched()) {
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simd_put(ctx);
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simd_get(ctx);
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return true;
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}
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#endif
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return false;
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}
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static __must_check inline bool simd_use(simd_context_t *ctx)
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{
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if (!(*ctx & HAVE_FULL_SIMD))
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return false;
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if (*ctx & HAVE_SIMD_IN_USE)
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return true;
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#if defined(CONFIG_X86_64)
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kernel_fpu_begin();
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#elif defined(CONFIG_KERNEL_MODE_NEON)
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kernel_neon_begin();
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#endif
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*ctx |= HAVE_SIMD_IN_USE;
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return true;
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}
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#endif /* _WG_SIMD_H */
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