linux-kernel - Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

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Date:	Fri, 08 Jun 2012 16:25:01 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	andi@...stfloor.org, mingo@...e.hu, ming.m.lin@...el.com,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Borislav Petkov <borislav.petkov@....com>,
	Dimitri Sivanich <sivanich@....com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>
Subject: Re: [PATCH] perf/x86: check ucode before disabling PEBS on
 SandyBridge

On Fri, 2012-06-08 at 16:07 +0200, Stephane Eranian wrote:
> > +static const u32 snb_ucode_rev = 0x28;
> > +
> 
> That needs to be a per CPU model value. It
> is not the same for SNB vs. SNB-EP. On EP
> it may even depends on stepping. 

Yeah, you said, easiest is removing the const and putting some
assignments to the thing somewhere in our model switch.

Do you know what values for what chip we should use?

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