linux-kernel - Re: [PATCH] perf/x86/uncore: Add missing filter constraint for SKX CHA event

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Date:   Mon, 12 Mar 2018 21:49:35 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org, eranian@...gle.com,
        ak@...ux.intel.com
Subject: Re: [PATCH] perf/x86/uncore: Add missing filter constraint for SKX
 CHA event



On 3/12/2018 12:39 PM, Peter Zijlstra wrote:
> On Mon, Mar 12, 2018 at 08:41:34AM -0700, Kan Liang wrote:
>> From: Stephane Eranian <eranian@...gle.com>
>>
>> Adding a filter constraint for Intel Skylake CHA event
>> UNC_CHA_UPI_CREDITS_ACQUIRED (0x38).
>> The event supports core-id/thread-id and link filtering.
> 
> Could you also comment on the other CHA patch?
> 
>   https://lkml.kernel.org/r/CS1PR84MB01182561B15688095C4DBF30F6D80@CS1PR84MB0118.NAMPRD84.PROD.OUTLOOK.COM
>


Now, there is a recommended way in uncore document to query the number 
of CHAs by reading bits 27:0 in the CAPID6 register located at Device 
30, Function 3, Offset 0x9C.
I have implemented a patch and sent it to Gary. It should fix his issue.

Thanks,
Kan