Messages in this thread | | | Date | Wed, 1 Jun 2011 09:24:44 -0400 | From | Konrad Rzeszutek Wilk <> | Subject | Re: Question about iommu on x86_64 and radeon driver. |
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On Tue, May 31, 2011 at 08:57:39PM +0100, Daniel Haid wrote: > Just another question, the problem seems to be an issue with > > swiotlb=force > > and I assume that without "force" DMA with addresses that > already are below 4GB should be handled without any > bounce-buffer, and with "force" everything goes through > the bounce-buffer, is this correct? > > Now I have a VIA chipset where the IOMMU does not work, so > swiotlb is activated, but is it activated in force mode or > in normal mode? How can I find out?
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 it is activated in force mode, maybe the problem will > go away in normal mode?
<nods> Should.
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