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

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Date:	Mon, 12 Sep 2011 14:35:51 +0200
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	Sethi Varun-B16395 <B16395@...escale.com>
CC:	Joerg Roedel <joro@...tes.org>, Greg KH <gregkh@...e.de>,
	"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

On Mon, Sep 12, 2011 at 08:08:41AM -0400, Sethi Varun-B16395 wrote:
> > The IOMMUs are usually devices on the bus itself, so they are initialized
> > after the bus is set up and the devices on it are populated.  So the
> > function can not be called on bus initialization because the IOMMU is not
> > ready at this point.
> Well, at what point would the add_device_group (referring to patch set posted by Alex) call back be invoked?

The details are up to Alex Williamson. One option is to register a
notifier for the bus in the iommu_bus_init() function and react to its
notifications.
I think in the end we will have a number of additional call-backs in the
iommu_ops which are called by the notifier (or from the driver-core
directly) to handle actions like added or removed devices. All the
infrastructure for that which is implemented in the iommu-drivers today
will then be in the iommu-core code.

	Joerg

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