linux-kernel - Re: [PATCH v2 4/4] perf/x86/uncore: modularize Intel uncore driver

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Date:	Fri, 25 Apr 2014 22:06:15 +0800
From:	"Yan, Zheng" <zheng.z.yan@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH v2 4/4] perf/x86/uncore: modularize Intel uncore driver

On 04/25/2014 09:55 PM, Peter Zijlstra wrote:
> On Fri, Apr 25, 2014 at 09:17:36PM +0800, Yan, Zheng wrote:
>> On 04/24/2014 07:27 PM, Peter Zijlstra wrote:
>>> On Thu, Apr 24, 2014 at 12:36:01PM +0200, Stephane Eranian wrote:
>>>>> Most of hardware specific codes in the Intel uncore driver are for
>>>>> SandyBridge/IvyBridge/Haswell. Uncore subsystem in these CPUs are
>>>>> similar. One module per CPU type means we have to duplicate lots of
>>>>> code. I don't think it's a good idea.
>>>>>
>>>> Then, at least split nhm_ex from the rest. It is very big.
>>>
>>> Aren't the EX parts in general far more complex and different from the
>>> EP parts? Or will the SNB/IVB/HSW-EX parts also be similar again? (this
>>> would be a good thing).
>>
>> SNB/IVB/HSW-EX are almost identical to SNB/IVB/HSW-EP.
> 
> Ah, good, sanity prevails!
> 
>> NHM/WSM-EX are complete different from SNB/IVB/HSW-EX
> 
> Yeah, NHM/WSM-EX are different from pretty much anything.
> 
> Where do NHM/WSM-EP fall? I know they're radically different to the EX
> parts but are they similar again to the SNB/IVB/HSW EP parts?
> 

the uncore driver does not support NHM/WSM-EP (I don't know the module numbers for NHM/WSM-EP, maybe I'm wrong)

> If not we'd have 3 groups:
> 
> NHM/WSM-EP
> NHM/WSM-EX
> SNB/IVB/HSW
> 

I think we'd have:

NHM/WSM-EX
SNB/IVB/HSW-EP
Desktop version of NHM/SNB/IVB/HSW

Regards
Yan, Zheng


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