The following commit has been merged into the perf/core branch of tip:
Commit-ID: e39b82f6cb0526c551d4651ba6d286b6b1f9e9c3
Gitweb: https://git.kernel.org/tip/e39b82f6cb0526c551d4651ba6d286b6b1f9e9c3
Author: Zide Chen <zide.chen@intel.com>
AuthorDate: Thu, 23 Oct 2025 15:37:51 -07:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Wed, 29 Oct 2025 10:29:53 +01:00
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 <zhenyuw.linux@gmail.com>
Signed-off-by: Zide Chen <zide.chen@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
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 ec753e3..a5f2e0b 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),