linux-kernel - Re: Question about iommu on x86

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Message-ID: <d0ce6a4ba6092a1a9ef0f1e8f3cac9c9@admin.gogi.tv>
Date:	Tue, 31 May 2011 20:57:39 +0100
From:	Daniel Haid <d.haid@...i.tv>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: Question about iommu on x86_64 and radeon driver.

 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?

 If it is activated in force mode, maybe the problem will
 go away in normal mode?

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