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

[Jesse Barnes]

On Wed, 14 Nov 2012 20:43:31 +0000
Jesse Barnes <jbarnes at virtuousgeek.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