Re: [PATCHv7 05/12] iommu/core: add ops->{bound,unbind}_driver()

From: Joerg Roedel
Date: Mon Dec 30 2013 - 09:00:06 EST

On Thu, Dec 12, 2013 at 09:57:06AM +0200, Hiroshi Doyu wrote:
> ops->{bound,unbind}_driver() functions are called at
> This is necessary to control the device population order. IOMMU master
> devices depend on an IOMMU device instanciation. IOMMU master devices
> can be registered to an IOMMU only after it's successfully
> populated. This IOMMU registration is done via
> ops->bound_driver(). Currently this population can be deferred if
> depending IOMMU device hasn't yet been populated in driver core. This
> cannot be done via ops->add_device() since after add_device() device's
> population/instanciation can be still deferred via probe().

How about doing dependency checking in the add/remove_device callbacks
instead? When a device is about to be initialized where the IOMMU is not
set up yet, just setup the IOMMU first before initializing the device?


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