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Message-ID: <Zxdudu1tpCbNvm1d@BLRRASHENOY1.amd.com>
Date: Tue, 22 Oct 2024 14:50:54 +0530
From: "Gautham R. Shenoy" <gautham.shenoy@....com>
To: Mario Limonciello <mario.limonciello@....com>
Cc: Borislav Petkov <bp@...en8.de>, Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
"H . Peter Anvin" <hpa@...or.com>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Perry Yuan <perry.yuan@....com>,
Brijesh Singh <brijesh.singh@....com>,
Peter Zijlstra <peterz@...radead.org>,
Li RongQing <lirongqing@...du.com>,
"open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <linux-kernel@...r.kernel.org>,
"open list:ACPI" <linux-acpi@...r.kernel.org>,
"open list:AMD PSTATE DRIVER" <linux-pm@...r.kernel.org>,
Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Subject: Re: [PATCH v2 3/5] x86/cpu: Enable SD_ASYM_PACKING for PKG Domain on
AMD Processors
On Mon, Oct 21, 2024 at 10:46:06PM -0500, Mario Limonciello wrote:
> From: Perry Yuan <perry.yuan@....com>
>
> Enable the SD_ASYM_PACKING domain flag for the PKG domain on AMD
> heterogeneous processors.
> This flag is beneficial for processors with one or more CCDs and
> relies on x86_sched_itmt_flags().
>
> Signed-off-by: Perry Yuan <perry.yuan@....com>
> Co-developed-by: Mario Limonciello <mario.limonciello@....com>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
> ---
> arch/x86/kernel/smpboot.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
> index 766f092dab80b..b5a8f0891135b 100644
> --- a/arch/x86/kernel/smpboot.c
> +++ b/arch/x86/kernel/smpboot.c
> @@ -497,8 +497,9 @@ static int x86_cluster_flags(void)
>
> static int x86_die_flags(void)
> {
> - if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU))
> - return x86_sched_itmt_flags();
> + if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU) ||
> + cpu_feature_enabled(X86_FEATURE_AMD_HETEROGENEOUS_CORES))
> + return x86_sched_itmt_flags();
>
> return 0;
> }
> --
> 2.43.0
>
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