linux-kernel - Re: Question about iommu on x86

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Message-ID: <9e26ea71798d10a3f900c777b71ff485@admin.gogi.tv>
Date:	Fri, 27 May 2011 23:20:09 +0100
From:	Daniel Haid <d.haid@...i.tv>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Andi Kleen <andi@...stfloor.org>, <linux-kernel@...r.kernel.org>
Subject: Re: Question about iommu on x86_64 and radeon driver.

> The DRM code is not used anymore. It was used by XFree86 but nowadays
> the TTM code is used instead.

 I see

> Ah, this would be a lengthy writeup.. so did you look at the
> link I pointed you to?

 Yes I have started, but do not understand everything yet.

 What are MFNs? Is this something Xen-specific?

 An does your post imply that on bare metal with "swiotlb=force 
 iommu=soft"
 alloc_page with GFP_DMA32 does also not allocate under 4GB?

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