linux-kernel - Re: [PATCH] perf/x86/intel/uncore: Fix CHA registers configuration procedure for Knights Landing platform

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Date:	Fri, 6 May 2016 11:54:53 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	hchrzani <hubert.chrzaniuk@...el.com>
cc:	lukasz.anaczkowski@...el.com, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, peterz@...radead.org, kan.liang@...el.com,
	vthakkar1994@...il.com, bp@...e.de, harish.chegondi@...el.com,
	izumi.taku@...fujitsu.com, linux-kernel@...r.kernel.org,
	Lawrence F Meadows <lawrence.f.meadows@...el.com>
Subject: Re: [PATCH] perf/x86/intel/uncore: Fix CHA registers configuration
 procedure for Knights Landing platform

On Fri, 6 May 2016, hchrzani wrote:

> CHA events in Knights Landing platform require programming filter registers properly.
> Before change, code lacked mandatory bitset operations for reserved bits.
> As a result some events were not counted.
> 
> Fixes: 77af003 ('perf/x86/intel/uncore: Add Knights Landing uncore PMU support')
> Signed-off-by: Hubert Chrzaniuk <hubert.chrzaniuk@...el.com>
> Signed-off-by: Lawrence F Meadows <lawrence.f.meadows@...el.com>
> ---
>  arch/x86/events/intel/uncore_snbep.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
> index ab2bcaa..47d7216 100644
> --- a/arch/x86/events/intel/uncore_snbep.c
> +++ b/arch/x86/events/intel/uncore_snbep.c
> @@ -1902,6 +1902,7 @@ static int knl_cha_hw_config(struct intel_uncore_box *box,
>  		reg1->reg = HSWEP_C0_MSR_PMON_BOX_FILTER0 +
>  			    KNL_CHA_MSR_OFFSET * box->pmu->pmu_idx;
>  		reg1->config = event->attr.config1 & knl_cha_filter_mask(idx);
> +		reg1->config |= 0x23ull << 32;

Please use proper defines and not some magic hex constants.

Thanks,

	tglx