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

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Message-ID: <20121114211905.503f3701@pyramind.ukuu.org.uk>
Date:	Wed, 14 Nov 2012 21:19:05 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [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.

What happens if the other addresses map to an external memory object - eg
a PCI device which is a legitimate DMA source for video overlay etc ?

I assume this is just for GPU fetches from main memory ?

Alan
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