linux-kernel - Re: [PATCH v2] ARM: vfp: Add missing VFP instructions to neon_support

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Date:   Wed, 11 Oct 2023 02:49:44 +0000
From:   Mark-PK Tsai (蔡沛剛) 
        <Mark-PK.Tsai@...iatek.com>
To:     "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
CC:     "robin.murphy@....com" <robin.murphy@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "xuewen.yan@...soc.com" <xuewen.yan@...soc.com>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        YJ Chiang (江英杰) <yj.chiang@...iatek.com>
Subject: Re: [PATCH v2] ARM: vfp: Add missing VFP instructions to
 neon_support_hook

On Mon, 2023-09-25 at 21:17 +0800, Mark-PK Tsai wrote:
> Add the missing "Unconditional Advanced SIMD and floating-point
> instructions" in [1] to the VFP undef hook.
> 
> This commit addresses the issue reported in [2], where
> executing the vudot instruction on a platform with FEAT_DotProd
> support resulted in an undefined instruction error.
> 
> Link: 
> https://developer.arm.com/documentation/ddi0597/2023-06/?lang=en [1]
> Link: 
> https://lore.kernel.org/lkml/20230920083907.30479-1-mark-pk.tsai@mediatek.com/
>  [2]
> Signed-off-by: Mark-PK Tsai <mark-pk.tsai@...iatek.com>
> ---
>  arch/arm/vfp/vfpmodule.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
> index 7e8773a2d99d..b68efe643a12 100644
> --- a/arch/arm/vfp/vfpmodule.c
> +++ b/arch/arm/vfp/vfpmodule.c
> @@ -800,6 +800,24 @@ static struct undef_hook neon_support_hook[] =
> {{
>  	.cpsr_mask	= PSR_T_BIT,
>  	.cpsr_val	= PSR_T_BIT,
>  	.fn		= vfp_support_entry,
> +}, {
> +	.instr_mask	= 0xff000800,
> +	.instr_val	= 0xfc000800,
> +	.cpsr_mask	= 0,
> +	.cpsr_val	= 0,
> +	.fn		= vfp_support_entry,
> +}, {
> +	.instr_mask	= 0xff000800,
> +	.instr_val	= 0xfd000800,
> +	.cpsr_mask	= 0,
> +	.cpsr_val	= 0,
> +	.fn		= vfp_support_entry,
> +}, {
> +	.instr_mask	= 0xff000800,
> +	.instr_val	= 0xfe000800,
> +	.cpsr_mask	= 0,
> +	.cpsr_val	= 0,
> +	.fn		= vfp_support_entry,
>  }};

Could someone please kindly review this patch?
Thanks.