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

diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c
index ec753e39b0077858ee51fcc22ab37110d24c1f98..a5f2e0be2337869a9a38ac6a3ad8e53973438443 100644 (file)
--- 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),