linux-kernel - [PATCH] perf/x86/intel/cstate: Add Clearwater Forest support

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Message-ID: <20250826221418.18954-1-zide.chen@intel.com>
Date: Tue, 26 Aug 2025 15:14:18 -0700
From: Zide Chen <zide.chen@...el.com>
To: linux-kernel@...r.kernel.org
Cc: peterz@...radead.org,
	artem.bityutskiy@...ux.intel.com,
	rui.zhang@...el.com,
	Zhenyu Wang <zhenyuw.linux@...il.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Zide Chen <zide.chen@...el.com>
Subject: [PATCH] perf/x86/intel/cstate: Add Clearwater Forest support

From: Zhenyu Wang <zhenyuw.linux@...il.com>

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.

Cc: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Cc: Kan Liang <kan.liang@...ux.intel.com>
Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw.linux@...il.com>
Signed-off-by: Zide Chen <zide.chen@...el.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 ae4ec16156bb..028557210e23 100644
--- a/arch/x86/events/intel/cstate.c
+++ b/arch/x86/events/intel/cstate.c
@@ -627,6 +627,7 @@ 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),
-- 
2.34.1