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Date: Tue, 8 Oct 2013 19:02:28 +0200
From: "joro@8bytes.org" <joro@8bytes.org>
To: Bjorn Helgaas <bhelgaas@google.com>
Subject: Re: [PATCH 1/7] powerpc: Add interface to get msi region information
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Cc: "agraf@suse.de" <agraf@suse.de>, Wood Scott-B07421 <B07421@freescale.com>,
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On Tue, Oct 08, 2013 at 10:47:49AM -0600, Bjorn Helgaas wrote:
> I still have no idea what an "aperture type IOMMU" is,
> other than that it is "different."

An aperture based IOMMU is basically any GART-like IOMMU which can only
remap a small window (the aperture) of the DMA address space. DMA
outside of that window is either blocked completly or passed through
untranslated.


	Joerg