linux-kernel - [PATCH RESEND 1/3] perf/x86/intel/cstate: Add Clearwater Forest support

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Message-ID: <20251023223754.1743928-2-zide.chen@intel.com>
Date: Thu, 23 Oct 2025 15:37:51 -0700
From: Zide Chen <zide.chen@...el.com>
To: Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Eranian Stephane <eranian@...gle.com>
Cc: linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	Dapeng Mi <dapeng1.mi@...ux.intel.com>,
	Zide Chen <zide.chen@...el.com>,
	Xudong Hao <xudong.hao@...el.com>,
	Falcon Thomas <thomas.falcon@...el.com>,
	Artem Bityutskiy <artem.bityutskiy@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Zhenyu Wang <zhenyuw.linux@...il.com>
Subject: [PATCH RESEND 1/3] 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.

Cc: Artem Bityutskiy <artem.bityutskiy@...el.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 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),
-- 
2.51.1