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Date: Mon, 23 Aug 2010 09:35:07 +0800
From: Zhenyu Wang <zhenyuw@linux.intel.com>
To: Takashi Iwai <tiwai@suse.de>
Cc: Eric Anholt <eric@anholt.net>, David Airlie <airlied@linux.ie>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] agp/intel: Fix dma mask for Sandybridge
Message-ID: <20100823013507.GA29442@zhen-devel.sh.intel.com>
Reply-To: Zhenyu Wang <zhenyuw@linux.intel.com>
Mail-Followup-To: Takashi Iwai <tiwai@suse.de>,
	Eric Anholt <eric@anholt.net>, David Airlie <airlied@linux.ie>,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
References: <s5hlj81cn4n.wl%tiwai@suse.de>
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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:
>=20
>    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.

--=20
Open Source Technology Center, Intel ltd.

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