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With newer AMD GPUs (>=Navi,Renoir) there is FPU context usage in the amdgpu driver. The `kernel_fpu_begin/end` implementations in drm did not even allow nested begin-end blocks. Submitted by: Greg V Reviewed By: manu, hselasky Differential Revision: https://reviews.freebsd.org/D28061
68 lines
2 KiB
C
68 lines
2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2020 Greg V <greg@unrelenting.technology>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _FPU_API_H_
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#define _FPU_API_H_
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#if defined(__aarch64__) || defined(__amd64__) || defined(__i386__)
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#include <machine/fpu.h>
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extern struct fpu_kern_ctx *__lkpi_fpu_ctx;
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extern unsigned int __lkpi_fpu_ctx_level;
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static inline void
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kernel_fpu_begin()
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{
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if (__lkpi_fpu_ctx_level++ == 0) {
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fpu_kern_enter(curthread, __lkpi_fpu_ctx, FPU_KERN_NORMAL);
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}
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}
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static inline void
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kernel_fpu_end()
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{
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if (--__lkpi_fpu_ctx_level == 0) {
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fpu_kern_leave(curthread, __lkpi_fpu_ctx);
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}
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}
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#else
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static inline void
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kernel_fpu_begin()
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{
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}
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static inline void
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kernel_fpu_end()
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{
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}
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#endif
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#endif /* _FPU_API_H_ */
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