[RFC PATCH v2 02/11] x86/resctrl: Disable symmetric L2 CAT on Panther Lake

[Tony Luck]

Panther Lake reports L2 CAT in the symmetric CPUID leaf even though the
feature differs between P-cores and E-cores.

Disable the symmetric l2cat option for Panther Lake so resctrl does not
enumerate this asymmetric feature as symmetric.

Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
---
 arch/x86/kernel/cpu/resctrl/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 7951cfd20da4..709075ffc706 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -1128,6 +1128,9 @@ static __init void __check_quirks_intel(void)
 	case INTEL_BROADWELL_X:
 		intel_rdt_mbm_apply_quirk();
 		break;
+	case INTEL_PANTHERLAKE_L:
+		set_rdt_options("!l2cat");
+		break;
 	}
 }
 
-- 
2.56.0