linux-kernel - RE: [PATCH 02/10] Driver core: Add iommu_ops to bus

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Message-ID: <F1FD01C1EFCE15408DBF59462450B3BD1C461D@039-SN1MPN1-006.039d.mgd.msft.net>
Date:	Mon, 12 Sep 2011 11:40:10 +0000
From:	Sethi Varun-B16395 <B16395@...escale.com>
To:	Joerg Roedel <joro@...tes.org>, Greg KH <gregkh@...e.de>
CC:	Joerg Roedel <joerg.roedel@....com>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	David Woodhouse <dwmw2@...radead.org>,
	David Brown <davidb@...eaurora.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 02/10] Driver core: Add iommu_ops to bus_type



> -----Original Message-----
> From: kvm-owner@...r.kernel.org [mailto:kvm-owner@...r.kernel.org] On
> Behalf Of Joerg Roedel
> Sent: Thursday, September 08, 2011 2:12 PM
> To: Greg KH
> Cc: Joerg Roedel; iommu@...ts.linux-foundation.org; Alex Williamson; Ohad
> Ben-Cohen; David Woodhouse; David Brown; kvm@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH 02/10] Driver core: Add iommu_ops to bus_type
> 
> On Wed, Sep 07, 2011 at 12:44:45PM -0700, Greg KH wrote:
> > On Wed, Sep 07, 2011 at 09:19:19PM +0200, Joerg Roedel wrote:
> > > Hi Greg,
> > >
> > > the bus_set_iommu() function will be called by the IOMMU driver.
> > > There can be different drivers for the same bus, depending on the
> > > hardware. On PCI for example, there can be the Intel or the AMD
> > > IOMMU driver that implement the iommu-api and that register for that
> bus.
> >
> > Why are you pushing this down into the driver core?  What other busses
> > becides PCI use/need this?
> 
> Currently it is the platform_bus besides pci. The pci iommus are on x86
> and ia64 while all arm iommus use the platform_bus (by 'iommus' I only
> mean those implementing the iommu-api). Currently there are two drivers
> for arm iommus in /drivers/iommu.
> 
We too have an IOMMU on Freescale Socs (Power core based) sitting on the platform bus
and are looking at integrating it with the linux IOMMU API.

-Varun

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