linux-kernel - Re: [PATCH 3/3] perf/x86/intel: Enable C-state residency events for Cannon Lake

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Date:   Mon, 19 Mar 2018 16:09:32 -0700
From:   Benson Leung <bleung@...gle.com>
To:     Harry Pan <harry.pan@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     gs0622@...il.com, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, x86@...nel.org, Kan.liang@...el.com,
        puthik@...gle.com, Benson Leung <bleung@...gle.com>,
        bleung@...omium.org
Subject: Re: [PATCH 3/3] perf/x86/intel: Enable C-state residency events for
 Cannon Lake

Hi Harry,

On 03/09/2018 04:15 AM, Harry Pan wrote:
> Cannon Lake supports C1/C3/C6/C7, PC2/PC3/PC6/PC7/PC8/PC9/PC10
> state residency counters, this patch enables those counters.
> 
> The MSR information is based on Intel Software Developers' Manual,
> Vol. 4, Order No. 335592.
> 
> Signed-off-by: Harry Pan <harry.pan@...el.com>

Reviewed-by: Benson Leung <bleung@...omium.org>

> ---
>  arch/x86/events/intel/cstate.c | 44 +++++++++++++++++++++++++++++-------------
>  1 file changed, 31 insertions(+), 13 deletions(-)
> 
> diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c
> index 72db0664a53d..9aca448bb8e6 100644
> --- a/arch/x86/events/intel/cstate.c
> +++ b/arch/x86/events/intel/cstate.c
> @@ -40,50 +40,51 @@
>   * Model specific counters:
>   *	MSR_CORE_C1_RES: CORE C1 Residency Counter
>   *			 perf code: 0x00
> - *			 Available model: SLM,AMT,GLM
> + *			 Available model: SLM,AMT,GLM,CNL
>   *			 Scope: Core (each processor core has a MSR)
>   *	MSR_CORE_C3_RESIDENCY: CORE C3 Residency Counter
>   *			       perf code: 0x01
> - *			       Available model: NHM,WSM,SNB,IVB,HSW,BDW,SKL,GLM
> + *			       Available model: NHM,WSM,SNB,IVB,HSW,BDW,SKL,GLM,
> +						CNL
>   *			       Scope: Core
>   *	MSR_CORE_C6_RESIDENCY: CORE C6 Residency Counter
>   *			       perf code: 0x02
> - *			       Available model: SLM,AMT,NHM,WSM,SNB,IVB,HSW,BDW
> - *						SKL,KNL,GLM
> + *			       Available model: SLM,AMT,NHM,WSM,SNB,IVB,HSW,BDW,
> + *						SKL,KNL,GLM,CNL
>   *			       Scope: Core
>   *	MSR_CORE_C7_RESIDENCY: CORE C7 Residency Counter
>   *			       perf code: 0x03
> - *			       Available model: SNB,IVB,HSW,BDW,SKL
> + *			       Available model: SNB,IVB,HSW,BDW,SKL,CNL
>   *			       Scope: Core
>   *	MSR_PKG_C2_RESIDENCY:  Package C2 Residency Counter.
>   *			       perf code: 0x00
> - *			       Available model: SNB,IVB,HSW,BDW,SKL,KNL,GLM
> + *			       Available model: SNB,IVB,HSW,BDW,SKL,KNL,GLM,CNL
>   *			       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
> + *			       Available model: NHM,WSM,SNB,IVB,HSW,BDW,SKL,KNL,
> + *						GLM,CNL
>   *			       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
> + *						SKL,KNL,GLM,CNL
>   *			       Scope: Package (physical package)
>   *	MSR_PKG_C7_RESIDENCY:  Package C7 Residency Counter.
>   *			       perf code: 0x03
> - *			       Available model: NHM,WSM,SNB,IVB,HSW,BDW,SKL
> + *			       Available model: NHM,WSM,SNB,IVB,HSW,BDW,SKL,CNL
>   *			       Scope: Package (physical package)
>   *	MSR_PKG_C8_RESIDENCY:  Package C8 Residency Counter.
>   *			       perf code: 0x04
> - *			       Available model: HSW ULT only
> + *			       Available model: HSW ULT,CNL
>   *			       Scope: Package (physical package)
>   *	MSR_PKG_C9_RESIDENCY:  Package C9 Residency Counter.
>   *			       perf code: 0x05
> - *			       Available model: HSW ULT only
> + *			       Available model: HSW ULT,CNL
>   *			       Scope: Package (physical package)
>   *	MSR_PKG_C10_RESIDENCY: Package C10 Residency Counter.
>   *			       perf code: 0x06
> - *			       Available model: HSW ULT, GLM
> + *			       Available model: HSW ULT,GLM,CNL
>   *			       Scope: Package (physical package)
>   *
>   */
> @@ -486,6 +487,21 @@ static const struct cstate_model hswult_cstates __initconst = {
>  				  BIT(PERF_CSTATE_PKG_C10_RES),
>  };
>  
> +static const struct cstate_model cnl_cstates __initconst = {
> +	.core_events		= BIT(PERF_CSTATE_CORE_C1_RES) |
> +				  BIT(PERF_CSTATE_CORE_C3_RES) |
> +				  BIT(PERF_CSTATE_CORE_C6_RES) |
> +				  BIT(PERF_CSTATE_CORE_C7_RES),
> +
> +	.pkg_events		= BIT(PERF_CSTATE_PKG_C2_RES) |
> +				  BIT(PERF_CSTATE_PKG_C3_RES) |
> +				  BIT(PERF_CSTATE_PKG_C6_RES) |
> +				  BIT(PERF_CSTATE_PKG_C7_RES) |
> +				  BIT(PERF_CSTATE_PKG_C8_RES) |
> +				  BIT(PERF_CSTATE_PKG_C9_RES) |
> +				  BIT(PERF_CSTATE_PKG_C10_RES),
> +};
> +
>  static const struct cstate_model slm_cstates __initconst = {
>  	.core_events		= BIT(PERF_CSTATE_CORE_C1_RES) |
>  				  BIT(PERF_CSTATE_CORE_C6_RES),
> @@ -557,6 +573,8 @@ static const struct x86_cpu_id intel_cstates_match[] __initconst = {
>  	X86_CSTATES_MODEL(INTEL_FAM6_KABYLAKE_MOBILE,  snb_cstates),
>  	X86_CSTATES_MODEL(INTEL_FAM6_KABYLAKE_DESKTOP, snb_cstates),
>  
> +	X86_CSTATES_MODEL(INTEL_FAM6_CANNONLAKE_MOBILE, cnl_cstates),
> +
>  	X86_CSTATES_MODEL(INTEL_FAM6_XEON_PHI_KNL, knl_cstates),
>  	X86_CSTATES_MODEL(INTEL_FAM6_XEON_PHI_KNM, knl_cstates),
>  
> 

Thank you!
-- 
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
bleung@...gle.com
Chromium OS Project
bleung@...omium.org



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