linux-kernel - Re: [PATCH] perf/x86/intel/rapl: Add support for Knights Landing (KNL)

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Message-ID: <20150529115543.GP3644@twins.programming.kicks-ass.net>
Date:	Fri, 29 May 2015 13:55:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Dasaratharaman Chandramouli 
	<dasaratharaman.chandramouli@...el.com>
Cc:	Jacob Pan Jun <jacob.jun.pan@...ux.intel.com>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Nikhil Rao <nikhil.rao@...el.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf/x86/intel/rapl: Add support for Knights Landing
 (KNL)

On Tue, May 26, 2015 at 11:47:39AM -0700, Dasaratharaman Chandramouli wrote:
> Knights Landing DRAM RAPL supports PKG and DRAM RAPL domains.
> DRAM RAPL has a different fixed energy unit (2^-16J) similar to
> that of HSW.
> 

Please also Cc the author of the code you're patching.

Cc: Stephane Eranian <eranian@...gle.com>
> Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@...el.com>
> ---
>  arch/x86/kernel/cpu/perf_event_intel_rapl.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/arch/x86/kernel/cpu/perf_event_intel_rapl.c b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
> index 999289b9..96633fb 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel_rapl.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
> @@ -86,6 +86,10 @@ static const char *rapl_domain_names[NR_RAPL_DOMAINS] __initconst = {
>  			 1<<RAPL_IDX_RAM_NRG_STAT|\
>  			 1<<RAPL_IDX_PP1_NRG_STAT)
>  
> +/* Knights Landing has PKG, RAM */
> +#define RAPL_IDX_KNL	(1<<RAPL_IDX_PKG_NRG_STAT|\
> +			 1<<RAPL_IDX_RAM_NRG_STAT)
> +
>  /*
>   * event code: LSB 8 bits, passed in attr->config
>   * any other bit is reserved
> @@ -487,6 +491,18 @@ static struct attribute *rapl_events_hsw_attr[] = {
>  	NULL,
>  };
>  
> +static struct attribute *rapl_events_knl_attr[] = {
> +	EVENT_PTR(rapl_pkg),
> +	EVENT_PTR(rapl_ram),
> +
> +	EVENT_PTR(rapl_pkg_unit),
> +	EVENT_PTR(rapl_ram_unit),
> +
> +	EVENT_PTR(rapl_pkg_scale),
> +	EVENT_PTR(rapl_ram_scale),
> +	NULL,
> +};
> +
>  static struct attribute_group rapl_pmu_events_group = {
>  	.name = "events",
>  	.attrs = NULL, /* patched at runtime */
> @@ -730,6 +746,10 @@ static int __init rapl_pmu_init(void)
>  		rapl_cntr_mask = RAPL_IDX_SRV;
>  		rapl_pmu_events_group.attrs = rapl_events_srv_attr;
>  		break;
> +	case 87: /* Knights Landing */
> +		rapl_add_quirk(rapl_hsw_server_quirk);
> +		rapl_cntr_mask = RAPL_IDX_KNL;
> +		rapl_pmu_events_group.attrs = rapl_events_knl_attr;

		break;

?
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