linux-kernel - Re: [PATCH 0/2] PCI: pci_unignore

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Message-ID: <20150306184920.GI20077@google.com>
Date:	Fri, 6 Mar 2015 12:49:20 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Alex Deucher <alexdeucher@...il.com>
Cc:	Alex Williamson <alex.williamson@...hat.com>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Dave Airlie <airlied@...ux.ie>,
	"Deucher, Alexander" <alexander.deucher@....com>,
	Maling list - DRI developers 
	<dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] PCI: pci_unignore_hotplug()

On Tue, Feb 24, 2015 at 03:23:27PM -0500, Alex Deucher wrote:
> On Tue, Feb 24, 2015 at 3:12 PM, Alex Williamson
> <alex.williamson@...hat.com> wrote:
> > I'd kinda like to use pci_ignore_hotplug() for devices in use by a
> > user via vfio-pci, but the interface seems only partially implemented
> > since we can only set ignore_hotplug and not clear it.  This adds the
> > capability to clear the flag and applies it as seems to be appropriate
> > to the existing users.  I don't have a system with power control for
> > a radeon or nouveau device, so I'd certainly appreciate testing.  It
> > seems though that once the device is in D0, we've passed the critical
> > point where the device could be accidentally unplugged.  Thanks,
> 
> Something re-broke this recently.  See:
> https://bugzilla.kernel.org/show_bug.cgi?id=61891
> https://bugzilla.kernel.org/show_bug.cgi?id=89731

I'm not opposed to adding pci_unignore_hotplug() when we have users for it.
I don't really want to throw in the nouveau and radeon changes while there
are open issues in the same area, though.

I haven't looked at the bugzillas above.  Let me know if I should.

Bjorn
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