linux-kernel - Re: RFC: (re-)binding the VFIO platform driver to a platform device

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Date:	Tue, 1 Oct 2013 17:44:51 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Kim Phillips <kim.phillips@...aro.org>
CC:	<linux-kernel@...r.kernel.org>, <gregkh@...uxfoundation.org>,
	<a.motakis@...tualopensystems.com>, <agraf@...e.de>,
	<alex.williamson@...hat.com>, <stuart.yoder@...escale.com>,
	<B07421@...escale.com>, <B16395@...escale.com>,
	<R65777@...escale.com>, <peter.maydell@...aro.org>,
	<christoffer.dall@...aro.org>, <santosh.shukla@...aro.org>,
	<kvm@...r.kernel.org>
Subject: Re: RFC: (re-)binding the VFIO platform driver to a platform device

On Tue, 2013-10-01 at 16:59 -0500, Kim Phillips wrote:
> On Tue, 1 Oct 2013 14:15:38 -0500
> Scott Wood <scottwood@...escale.com> wrote:
> 
> > I think the ideal interface would be if you could write the sysfs device
> > name into the vfio bind file (or some new file in the same directory),
> > and have it claim that device (preferably with an atomic unbind from the
> > previous driver).
> 
> ok.

...which apparently is what you are already doing (except for the atomic
part).  My recollection of how this works on PCI (via new_id) apparently
kept me from reading it properly. :-P

> > We shouldn't be messing around with compatible
> > (either modifying it or telling VFIO which compatibles to look for) when
> > we know the specific devices (not just type of devices) we want to bind.
> 
> ok, but I still don't see how to get past driver_match_device()'s
> refusal to allow bind a non-compatible driver (or one who's name isn't
> in the compatible list).

Probably something similar to your hack, except use a flag or some other
neutral mechanism rather than a driver name.

The flag could be something like "I'll try to bind to any device on this
bus, but only if explicitly requested".

-Scott



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