linux-kernel - Re: Question about iommu on x86

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Message-ID: <08370791664f069624d25c757ed101c0@admin.gogi.tv>
Date:	Wed, 25 May 2011 11:00:33 +0100
From:	Daniel Haid <d.haid@...i.tv>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: Question about iommu on x86_64 and radeon driver.

> I added it originally. The VIA chipset seems to hang on most
> DMAs through the IOMMU, so it was disabled.

 I see. Now, maybe this will not work for some reason, but
 would it be possible to somehow disable both IOMMU and SWIOTLB
 and tell all drivers only to do DMA with the lower 4GB of memory?

 Unfortunately simply turning "iommu=off" does not work for me
 as the sata and pata drivers stop working.
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