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

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Message-ID: <1380748121.12932.89.camel@snotra.buserror.net>
Date:	Wed, 2 Oct 2013 16:08:41 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:	Christoffer Dall <christoffer.dall@...aro.org>,
	Yoder Stuart-B08248 <B08248@...escale.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Kim Phillips <kim.phillips@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"a.motakis@...tualopensystems.com" <a.motakis@...tualopensystems.com>,
	"agraf@...e.de" <agraf@...e.de>,
	Wood Scott-B07421 <B07421@...escale.com>,
	Sethi Varun-B16395 <B16395@...escale.com>,
	Bhushan Bharat-R65777 <R65777@...escale.com>,
	"peter.maydell@...aro.org" <peter.maydell@...aro.org>,
	"santosh.shukla@...aro.org" <santosh.shukla@...aro.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: RFC: (re-)binding the VFIO platform driver to a platform device

On Wed, 2013-10-02 at 13:37 -0700, gregkh@...uxfoundation.org wrote:
> On Wed, Oct 02, 2013 at 11:43:30AM -0700, Christoffer Dall wrote:
> > > What's wrong with a non-vfio-specific flag that a driver can set, that
> > > indicates that the driver is willing to try to bind to any device on the
> > > bus if explicitly requested via the existing sysfs bind mechanism?
> > > 
> > It sounds more hackish to me to invent some 'generic' flag to solve a
> > very specific case.  What you're suggesting would let users specify that
> > a serial driver should handle a NIC hardware, no?  That sounds much much
> > worse to me.
> 
> You can do that today, with any PCI driver (or USB driver as well), just
> use the bind/unbind files in sysfs and you had better "know" what you
> are doing...

sysfs bind won't work if it driver_match_device() fails.  PCI has
PCI_ANY_ID, so the missing piece for PCI is a way to say that the driver
should not bind to a device except when explicitly requested via sysfs
bind.

I don't see any equivalent functionality to PCI_ANY_ID for platform
devices.

-Scott



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