linux-kernel - Re: [Intel-gfx] [PATCH] x86/Sandy Bridge: reserve pages when integrated graphics is present

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Message-ID: <20121114151134.2df4d666@jbarnes-desktop>
Date:	Wed, 14 Nov 2012 15:11:34 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [Intel-gfx] [PATCH] x86/Sandy Bridge: reserve pages when
 integrated graphics is present

On Wed, 14 Nov 2012 20:43:31 +0000
Jesse Barnes <jbarnes@...tuousgeek.org> wrote:

> SNB graphics devices have a bug that prevent them from accessing certain
> memory ranges, namely anything below 1M and in the pages listed in the
> table.  So reserve those at boot if set detect a SNB gfx device on the
> CPU to avoid GPU hangs.
> 
> Stephane Marchesin had a similar patch to the page allocator awhile
> back, but rather than reserving pages up front, it leaked them at
> allocation time.

So if people are seeing seemingly random hangs with SNB, please give
this patch a try.  These issues aren't easy to hit, and they're
frustratingly hard to debug, but with some long runtime maybe it'll
give people some confidence.

-- 
Jesse Barnes, Intel Open Source Technology Center
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