linux-kernel - Re: [PATCH 0/4] iommu: iommu

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Message-ID: <1319229248.19448.6.camel@shinybook.infradead.org>
Date:	Fri, 21 Oct 2011 20:34:19 +0000
From:	"Woodhouse, David" <david.woodhouse@...el.com>
To:	Alex Williamson <alex.williamson@...hat.com>
CC:	"joerg.roedel@....com" <joerg.roedel@....com>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"chrisw@...hat.com" <chrisw@...hat.com>,
	"agraf@...e.de" <agraf@...e.de>,
	"dwg@....ibm.com" <dwg@....ibm.com>,
	"scottwood@...escale.com" <scottwood@...escale.com>,
	"B08248@...escale.com" <B08248@...escale.com>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>
Subject: Re: [PATCH 0/4] iommu: iommu_ops group interface

On Fri, 2011-10-21 at 13:55 -0600, Alex Williamson wrote:
> IOMMUs can't always distiguish transactions from each individual
> device in a system.  Sometimes this is by design (such as powerpc
> partitionable endpoints), other times by topology (PCIe-to-PCI
> bridges masking downstream devices).  We call these sets of
> indistinguishable devices "groups". 

Other times it's because a multi-function PCIe device is broken and does
all its DMA from function zero.... like some Ricoh devices seen in
laptops. Can you handle quirks to "group" those too?

-- 
                   Sent with MeeGo's ActiveSync support.

David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation



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