linux-kernel - Re: [PATCH v2] x86/cpu/amd: fix the highest perf query for new AMD processors

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Date:   Wed, 15 Jun 2022 12:17:22 +0800
From:   Huang Rui <ray.huang@....com>
To:     "Yuan, Perry" <Perry.Yuan@....com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Phillips, Kim" <kim.phillips@....com>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        Tony Luck <tony.luck@...el.com>,
        Jane Malalane <jane.malalane@...rix.com>,
        "Limonciello, Mario" <Mario.Limonciello@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Su, Jinzhou (Joe)" <Jinzhou.Su@....com>,
        "Meng, Li (Jassmine)" <Li.Meng@....com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2] x86/cpu/amd: fix the highest perf query for new AMD
 processors

On Tue, Jun 14, 2022 at 04:52:54PM +0800, Yuan, Perry wrote:
> In order to get the corrent highest perf for some new AMD processors,
> the amd_get_highest_perf() call will check the CPU model and
> return correct highest perf value.
> 
> Signed-off-by: Perry Yuan <Perry.Yuan@....com>

Acked-by: Huang Rui <ray.huang@....com>

> ---
>  arch/x86/kernel/cpu/amd.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
> index 0c0b09796ced..ff2075f26ef4 100644
> --- a/arch/x86/kernel/cpu/amd.c
> +++ b/arch/x86/kernel/cpu/amd.c
> @@ -1152,7 +1152,8 @@ u32 amd_get_highest_perf(void)
>  	struct cpuinfo_x86 *c = &boot_cpu_data;
>  
>  	if (c->x86 == 0x17 && ((c->x86_model >= 0x30 && c->x86_model < 0x40) ||
> -			       (c->x86_model >= 0x70 && c->x86_model < 0x80)))
> +			       (c->x86_model >= 0x70 && c->x86_model < 0x80) ||
> +			       (c->x86_model >= 0xa0 && c->x86_model < 0xb0)))
>  		return 166;
>  
>  	if (c->x86 == 0x19 && ((c->x86_model >= 0x20 && c->x86_model < 0x30) ||
> -- 
> 2.25.1
>