linux-kernel - Re: [PATCH 4/4] x86: intel-iommu: move to drivers/iommu/

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Message-ID: <20110608093801.GH4407@amd.com>
Date:	Wed, 8 Jun 2011 11:38:01 +0200
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	David Woodhouse <dwmw2@...radead.org>
CC:	Ohad Ben-Cohen <ohad@...ery.com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	David Brown <davidb@...eaurora.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH 4/4] x86: intel-iommu: move to drivers/iommu/

On Wed, Jun 08, 2011 at 05:17:38AM -0400, David Woodhouse wrote:
> On Wed, 2011-06-08 at 11:34 +0300, Ohad Ben-Cohen wrote:
> > --- a/drivers/pci/Makefile
> > +++ b/drivers/pci/Makefile
> > @@ -30,7 +30,7 @@ obj-$(CONFIG_PCI_MSI) += msi.o
> >  obj-$(CONFIG_HT_IRQ) += htirq.o
> >  
> >  # Build Intel IOMMU support
> > -obj-$(CONFIG_DMAR) += dmar.o iova.o intel-iommu.o
> > +obj-$(CONFIG_DMAR) += dmar.o iova.o
> >  
> >  obj-$(CONFIG_INTR_REMAP) += dmar.o intr_remapping.o
> >  
> 
> At least iova.o wants to go with it. That's one of the parts that is a
> candidate for harmonisation across IOMMU implementations, either by
> removing it or by having others use it too. It's how we allocate virtual
> I/O address space.
> 
> I suspect the interrupt remapping support may well want to move with it
> too. It's no more out-of-place in drivers/iommu than it is in
> drivers/pci. And then you can certainly move dmar.o too.

Interrupt remapping certainly makes sense too. I am not sure yet how to
generalize it because the AMD version of it is significantly different
from VT-d, but we'll see.

	Joerg

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