linux-kernel - [PATCH] x86/events/intel/cstate: Add Pantherlake support

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Message-Id: <20251112090024.3298186-1-kaushlendra.kumar@intel.com>
Date: Wed, 12 Nov 2025 14:30:24 +0530
From: Kaushlendra Kumar <kaushlendra.kumar@...el.com>
To: mingo@...hat.com,
	acme@...nel.org,
	namhyung@...nel.org,
	jolsa@...nel.org,
	adrian.hunter@...el.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org
Cc: linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kaushlendra Kumar <kaushlendra.kumar@...el.com>
Subject: [PATCH] x86/events/intel/cstate: Add Pantherlake support

It supports the same C-state residency counters as Lunarlake.This
enables monitoring of C1, C6, C7 core states and C2,C3,C6,C10
package states residency counters on Pantherlake platforms.

Signed-off-by: Kaushlendra Kumar <kaushlendra.kumar@...el.com>
---
 arch/x86/events/intel/cstate.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c
index ec753e39b007..b3582eeb6c4b 100644
--- a/arch/x86/events/intel/cstate.c
+++ b/arch/x86/events/intel/cstate.c
@@ -41,7 +41,7 @@
  *	MSR_CORE_C1_RES: CORE C1 Residency Counter
  *			 perf code: 0x00
  *			 Available model: SLM,AMT,GLM,CNL,ICX,TNT,ADL,RPL
- *					  MTL,SRF,GRR,ARL,LNL
+ *					  MTL,SRF,GRR,ARL,LNL,PTL
  *			 Scope: Core (each processor core has a MSR)
  *	MSR_CORE_C3_RESIDENCY: CORE C3 Residency Counter
  *			       perf code: 0x01
@@ -53,31 +53,32 @@
  *			       Available model: SLM,AMT,NHM,WSM,SNB,IVB,HSW,BDW,
  *						SKL,KNL,GLM,CNL,KBL,CML,ICL,ICX,
  *						TGL,TNT,RKL,ADL,RPL,SPR,MTL,SRF,
- *						GRR,ARL,LNL
+ *						GRR,ARL,LNL,PTL
  *			       Scope: Core
  *	MSR_CORE_C7_RESIDENCY: CORE C7 Residency Counter
  *			       perf code: 0x03
  *			       Available model: SNB,IVB,HSW,BDW,SKL,CNL,KBL,CML,
- *						ICL,TGL,RKL,ADL,RPL,MTL,ARL,LNL
+ *						ICL,TGL,RKL,ADL,RPL,MTL,ARL,LNL,
+ *						PTL
  *			       Scope: Core
  *	MSR_PKG_C2_RESIDENCY:  Package C2 Residency Counter.
  *			       perf code: 0x00
  *			       Available model: SNB,IVB,HSW,BDW,SKL,KNL,GLM,CNL,
  *						KBL,CML,ICL,ICX,TGL,TNT,RKL,ADL,
- *						RPL,SPR,MTL,ARL,LNL,SRF
+ *						RPL,SPR,MTL,ARL,LNL,SRF,PTL
  *			       Scope: Package (physical package)
  *	MSR_PKG_C3_RESIDENCY:  Package C3 Residency Counter.
  *			       perf code: 0x01
  *			       Available model: NHM,WSM,SNB,IVB,HSW,BDW,SKL,KNL,
  *						GLM,CNL,KBL,CML,ICL,TGL,TNT,RKL,
- *						ADL,RPL,MTL,ARL,LNL
+ *						ADL,RPL,MTL,ARL,LNL,PTL
  *			       Scope: Package (physical package)
  *	MSR_PKG_C6_RESIDENCY:  Package C6 Residency Counter.
  *			       perf code: 0x02
  *			       Available model: SLM,AMT,NHM,WSM,SNB,IVB,HSW,BDW,
  *						SKL,KNL,GLM,CNL,KBL,CML,ICL,ICX,
  *						TGL,TNT,RKL,ADL,RPL,SPR,MTL,SRF,
- *						ARL,LNL
+ *						ARL,LNL,PTL
  *			       Scope: Package (physical package)
  *	MSR_PKG_C7_RESIDENCY:  Package C7 Residency Counter.
  *			       perf code: 0x03
@@ -96,7 +97,7 @@
  *	MSR_PKG_C10_RESIDENCY: Package C10 Residency Counter.
  *			       perf code: 0x06
  *			       Available model: HSW ULT,KBL,GLM,CNL,CML,ICL,TGL,
- *						TNT,RKL,ADL,RPL,MTL,ARL,LNL
+ *						TNT,RKL,ADL,RPL,MTL,ARL,LNL,PTL
  *			       Scope: Package (physical package)
  *	MSR_MODULE_C6_RES_MS:  Module C6 Residency Counter.
  *			       perf code: 0x00
@@ -652,6 +653,7 @@ static const struct x86_cpu_id intel_cstates_match[] __initconst = {
 	X86_MATCH_VFM(INTEL_ARROWLAKE_H,	&adl_cstates),
 	X86_MATCH_VFM(INTEL_ARROWLAKE_U,	&adl_cstates),
 	X86_MATCH_VFM(INTEL_LUNARLAKE_M,	&lnl_cstates),
+	X86_MATCH_VFM(INTEL_PANTHERLAKE_L,	&lnl_cstates),
 	{ },
 };
 MODULE_DEVICE_TABLE(x86cpu, intel_cstates_match);
-- 
2.34.1