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Date: Wed, 01 Jun 2011 17:10:44 +0100
From: Daniel Haid <d.haid@gogi.tv>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: <linux-kernel@vger.kernel.org>, Andi Kleen <andi@firstfloor.org>
Subject: Re: Question about iommu on =?UTF-8?Q?x=38=36=5F=36=34=20and=20ra?=
 =?UTF-8?Q?deon=20driver=2E?=
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> Look in the source code. I somehow assumed it would activate it
> but maybe it isn't. And the problem you have is related to
> something else?

 If I have read the code correctly the only way to get
 swiotlb_force=1 in lib/swiotlb.c is to add the "swiotlb=force"
 argument to the kernel parameters.

 Without it on VIA chipsets swiotlb gets activated, but with
 swiotlb_force=0. In this case DMA to addresses below 4GB should be
 direct.

 But since I still get the error the radeon driver must (incorrectly)
 allocate memory above 4GB somewhere, but where?


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