linux-kernel - [PATCH 11/11] x86/cpu: Enable SD_ASYM_PACKING for DIE Domain on AMD Processors

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Message-ID: <111a9bebb6acccb53ed90e6e4563bfd6ca04f1b0.1724748733.git.perry.yuan@amd.com>
Date: Tue, 27 Aug 2024 17:36:59 +0800
From: Perry Yuan <perry.yuan@....com>
To: <hdegoede@...hat.com>, <ilpo.jarvinen@...ux.intel.com>,
	<Mario.Limonciello@....com>, <Borislav.Petkov@....com>,
	<kprateek.nayak@....com>
CC: <Alexander.Deucher@....com>, <Xinmei.Huang@....com>,
	<bharathprabhu.perdoor@....com>, <poonam.aggrwal@....com>, <Li.Meng@....com>,
	<platform-driver-x86@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<Xiaojian.Du@....com>
Subject: [PATCH 11/11] x86/cpu: Enable SD_ASYM_PACKING for DIE Domain on AMD Processors

Enable the SD_ASYM_PACKING domain flag for the DIE 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>
---
 arch/x86/kernel/smpboot.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 0c35207320cb..16a893322c4b 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -496,7 +496,8 @@ static int x86_cluster_flags(void)
 
 static int x86_die_flags(void)
 {
-	if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU))
+	if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU) ||
+			cpu_feature_enabled(X86_FEATURE_HETERO_CORE_TOPOLOGY))
 	       return x86_sched_itmt_flags();
 
 	return 0;
-- 
2.34.1