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

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Message-ID: <9c0c1a27-8db5-4af3-87a3-a29351b438fc@linux.intel.com>
Date: Thu, 13 Nov 2025 14:59:11 +0800
From: "Mi, Dapeng" <dapeng1.mi@...ux.intel.com>
To: Kaushlendra Kumar <kaushlendra.kumar@...el.com>, 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
Subject: Re: [PATCH] x86/events/intel/cstate: Add Pantherlake support


On 11/13/2025 2:50 PM, Mi, Dapeng wrote:
> Hi Kaushlendra,
>
> The PTL cstate enabling patch had been merged into tip perf/core branch. :)

Sorry, forgot to paste the link.
https://lore.kernel.org/all/20251023223754.1743928-4-zide.chen@intel.com/


>
> Thanks,
>
> - Dapeng
>
> On 11/12/2025 5:00 PM, Kaushlendra Kumar wrote:
>> 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);