linux-kernel - Re: [PATCH 1/7] powerpc: Add interface to get msi region information

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Message-ID: <20131008170228.GD17455@8bytes.org>
Date:	Tue, 8 Oct 2013 19:02:28 +0200
From:	"joro@...tes.org" <joro@...tes.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Bhushan Bharat-R65777 <R65777@...escale.com>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	"galak@...nel.crashing.org" <galak@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"agraf@...e.de" <agraf@...e.de>,
	Wood Scott-B07421 <B07421@...escale.com>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
Subject: Re: [PATCH 1/7] powerpc: Add interface to get msi region information

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


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