linux-kernel - Re: [PATCH] agp/intel: Fix dma mask for Sandybridge

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Message-ID: <20100823013507.GA29442@zhen-devel.sh.intel.com>
Date:	Mon, 23 Aug 2010 09:35:07 +0800
From:	Zhenyu Wang <zhenyuw@...ux.intel.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Eric Anholt <eric@...olt.net>, David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] agp/intel: Fix dma mask for Sandybridge

On 2010.08.20 17:36:08 +0200, Takashi Iwai wrote:
> Sandybridge requires 36bit dma mask, but the current code checks only
> against i965, thus it gives Oops with i915 probing on 32bit machine:
> 
>    nommu_map_sg: overflow 14a000000+4096 of device mask ffffffff
>    [drm:drm_agp_bind_pages] *ERROR* Failed to bind AGP memory: -12
>    BUG: unable to handle kernel paging request at fffffff8
>    IP: [<f7fac57f>] i915_gem_evict_something+0xef/0x230 [i915]
>    ...

Sandybridge can do 40-bit dma mask. This has been fixed upstream now.

-- 
Open Source Technology Center, Intel ltd.

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