linux-kernel - Re: [PATCH] mm: Work around Intel SNB GTT bug with some physical pages.

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Message-ID: <m2zk9jlf3e.fsf@firstfloor.org>
Date:	Mon, 07 May 2012 16:57:09 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Stéphane Marchesin <marcheu@...omium.org>
Cc:	linux-kernel@...r.kernel.org, keithp@...thp.com,
	torvalds@...ux-foundation.org, seanpaul@...omium.org,
	olofj@...omium.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] mm: Work around Intel SNB GTT bug with some physical pages.

Stéphane Marchesin <marcheu@...omium.org> writes:

> While investing some Sandy Bridge rendering corruption, I found out
> that all physical memory pages below 1MiB were returning garbage when
> read through the GTT. This has been causing graphics corruption (when
> it's used for textures, render targets and pixmaps) and GPU hangups
> (when it's used for GPU batch buffers).

It would be possible to exlude GFP_DMA from the page allocator. That
covers the first 16MB. You just need a custom zone list with ZONE_DMA.

-Andi

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