Message-ID: <95273478173af301f3b63b9be2559213e4f29fb8.camel@xry111.site>
Subject: Re: [PATCH V3] LoongArch: Provide kernel fpu functions
From:   Xi Ruoyao <xry111@xry111.site>
To:     maobibo <maobibo@loongson.cn>,
        Huacai Chen <chenhuacai@loongson.cn>,
        Arnd Bergmann <arnd@arndb.de>,
        Huacai Chen <chenhuacai@kernel.org>
Cc:     loongarch@lists.linux.dev, linux-arch@vger.kernel.org,
        Xuefeng Li <lixuefeng@loongson.cn>,
        Guo Ren <guoren@kernel.org>, Xuerui Wang <kernel@xen0n.name>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>,
        linux-kernel@vger.kernel.org, loongson-kernel@lists.loongnix.cn
Date:   Mon, 06 Mar 2023 20:09:07 +0800
In-Reply-To: <029a5993-b993-ab73-0a14-0df9b0ddf3da@loongson.cn>
References: <20230306095934.609589-1-chenhuacai@loongson.cn>
         <029a5993-b993-ab73-0a14-0df9b0ddf3da@loongson.cn>
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On Mon, 2023-03-06 at 20:03 +0800, maobibo wrote:
> =E5=9C=A8 2023/3/6 17:59, Huacai Chen =E5=86=99=E9=81=93:
> > Provide kernel_fpu_begin()/kernel_fpu_end() to allow the kernel itself
> > to use fpu. They can be used by some other kernel components, e.g., the
> > AMDGPU graphic driver for DCN.
> Since kernel is compiled with -msoft-float, I guess hw fpu will not be
> used in kernel by present:). However it is deserved to try.

See the draft AMD DCN support patch:
https://github.com/loongson/linux/commit/0ee299095c963938a7626c3121a8feef32=
251301

--=20
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University