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

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Date:	Fri, 21 Oct 2011 15:16:34 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	"Woodhouse, David" <david.woodhouse@...el.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 20:34 +0000, Woodhouse, David wrote:
> 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?

I could add:

drivers/pci/quirks.c: int pci_iommu_group_mf_quirk(struct pci_dev *)

That's used just like iommu_group_mf to always blacklist specific
devices.  Let me know VID/DID if you have them.  Thanks,

Alex

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