linux-kernel - [tip: x86/cpu] x86/cpu: Enable SD_ASYM

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Message-ID: <172993516683.1442.1977940515372789414.tip-bot2@tip-bot2>
Date: Sat, 26 Oct 2024 09:32:46 -0000
From: "tip-bot2 for Perry Yuan" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Perry Yuan <perry.yuan@....com>,
 Mario Limonciello <mario.limonciello@....com>,
 "Borislav Petkov (AMD)" <bp@...en8.de>,
 "Gautham R. Shenoy" <gautham.shenoy@....com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/cpu] x86/cpu: Enable SD_ASYM_PACKING for PKG domain on AMD

The following commit has been merged into the x86/cpu branch of tip:

Commit-ID:     b0979e53645825a38f814ca5d3d09aed2745911d
Gitweb:        https://git.kernel.org/tip/b0979e53645825a38f814ca5d3d09aed2745911d
Author:        Perry Yuan <perry.yuan@....com>
AuthorDate:    Fri, 25 Oct 2024 12:14:57 -05:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Fri, 25 Oct 2024 20:43:22 +02:00

x86/cpu: Enable SD_ASYM_PACKING for PKG domain on AMD

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>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
Link: https://lore.kernel.org/r/20241025171459.1093-4-mario.limonciello@amd.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 766f092..b5a8f08 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;
 }