linux-kernel - Re: [PATCH 3/4] perf, x86: check ucode before disabling PEBS on SandyBridge v3

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Message-ID: <20120613213451.GC32604@tassilo.jf.intel.com>
Date:	Wed, 13 Jun 2012 14:34:51 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, eranian@...gle.com
Subject: Re: [PATCH 3/4] perf, x86: check ucode before disabling PEBS on
 SandyBridge v3

> Stephane actually wrote:
> 
> "Ok, so to close on this, I tried the 6/6/2012 ucode update on a few
> SNB-EP systems.
> 
> I got two answers depending on the stepping:
> C1 (stepping 6) -> 0x618
> C2 (stepping 7) -> 0x70c
> 
> So we need to check x86_mask for stepping and adjust the value of
> snb_ucode_rev accordingly for model 45."

not sure i understood your point? 
What do you want me to change?

I check different numbers on the different models.

FWIW it works on a Sandy Bridge E and I believe I didn't change
the logic for non E, which Stephane tested.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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