From e39b82f6cb0526c551d4651ba6d286b6b1f9e9c3 Mon Sep 17 00:00:00 2001 From: Zide Chen Date: Thu, 23 Oct 2025 15:37:51 -0700 Subject: [PATCH] perf/x86/intel/cstate: Add Clearwater Forest support Clearwater Forest is based on the Darkmont Atom microarchitecture. >From the perspective of C-state residency profiling, it supports the same residency counters as Sierra Forest: CC1/CC6, PC2/PC6, and MC6. Please note that the C1E residency counter can only be read via PMT, not MSR. Therefore, tools relying on the perf_event framework cannot access the C1E residency. Signed-off-by: Zhenyu Wang Signed-off-by: Zide Chen Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Kan Liang Reviewed-by: Dapeng Mi Link: https://patch.msgid.link/20251023223754.1743928-2-zide.chen@intel.com --- arch/x86/events/intel/cstate.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c index ec753e39b007..a5f2e0be2337 100644 --- a/arch/x86/events/intel/cstate.c +++ b/arch/x86/events/intel/cstate.c @@ -628,6 +628,7 @@ static const struct x86_cpu_id intel_cstates_match[] __initconst = { X86_MATCH_VFM(INTEL_ATOM_GRACEMONT, &adl_cstates), X86_MATCH_VFM(INTEL_ATOM_CRESTMONT_X, &srf_cstates), X86_MATCH_VFM(INTEL_ATOM_CRESTMONT, &grr_cstates), + X86_MATCH_VFM(INTEL_ATOM_DARKMONT_X, &srf_cstates), X86_MATCH_VFM(INTEL_ICELAKE_L, &icl_cstates), X86_MATCH_VFM(INTEL_ICELAKE, &icl_cstates),