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Date: Mon, 9 Sep 2013 09:52:50 +0100
From: Will Deacon <will.deacon@arm.com>
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Subject: Re: [Qemu-devel] vfio for platform devices - 9/5/2012 - minutes
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To: Yoder Stuart-B08248 <B08248@freescale.com>
Cc: 'Peter Maydell' <peter.maydell@linaro.org>, 'Antonios Motakis' <a.motakis@virtualopensystems.com>, Wood Scott-B07421 <B07421@freescale.com>, 'Santosh Shukla' <santosh.shukla@linaro.org>, 'Alexander Graf' <agraf@suse.de>, "kvm-ppc@vger.kernel.org" <kvm-ppc@vger.kernel.org>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, "'kim.phillips@linaro.org'" <kim.phillips@linaro.org>, 'Alex Williamson' <alex.williamson@redhat.com>, Bhushan Bharat-R65777 <R65777@freescale.com>, Sethi Varun-B16395 <B16395@freescale.com>, "kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>, 'Christoffer Dall' <christoffer.dall@linaro.org>

On Fri, Sep 06, 2013 at 07:20:19PM +0100, Yoder Stuart-B08248 wrote:
> Adding Will...

[...]

> > I have a query about the ARM SMMU driver. In the ARM smmu driver I see,
> > that bus notifiers are registered for both amba and platform bus. Amba is
> > the I/O interconnect, right? Why is bus notifier required for the amba
> > bus?

Not sure I follow the question, really. If you have a DMA master registered
as an AMBA device (e.g. PL330) and it wants to use an SMMU, then you need to
be registered on that bus.

What would you prefer instead?

Will