[PATCH v2] x86/cpu: Enable SD_ASYM_PACKING for PKG domain on systems with AMD preferred cores

[Mario Limonciello]

For the scheduler to use and prefer AMD preferred core rankings set
SD_ASYM_PACKING for x86_die_flags().

Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
v2:
 * Fix c23 compatibility issue reported by LKP
---
 arch/x86/kernel/smpboot.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index b5a8f0891135b..6a38cf3feb1a9 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -62,6 +62,8 @@
 #include <linux/mc146818rtc.h>
 #include <linux/acpi.h>
 
+#include <acpi/cppc_acpi.h>
+
 #include <asm/acpi.h>
 #include <asm/cacheinfo.h>
 #include <asm/desc.h>
@@ -501,6 +503,15 @@ static int x86_die_flags(void)
 	    cpu_feature_enabled(X86_FEATURE_AMD_HETEROGENEOUS_CORES))
 		return x86_sched_itmt_flags();
 
+	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
+	    boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
+		bool prefcore = false;
+
+		amd_detect_prefcore(&prefcore);
+		if (prefcore)
+			return x86_sched_itmt_flags();
+	}
+
 	return 0;
 }
 

base-commit: 40384c840ea1944d7c5a392e8975ed088ecf0b37
-- 
2.43.0