linux-kernel - Re: How to reserve pci bus numbers for hotplug?

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Message-ID: <20131220005526.GB17307@kroah.com>
Date:	Thu, 19 Dec 2013 16:55:26 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Andreas Noever <andreas.noever@...il.com>
Cc:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: How to reserve pci bus numbers for hotplug?

On Sat, Dec 14, 2013 at 11:15:39PM +0100, Andreas Noever wrote:
> On Sat, Dec 14, 2013 at 11:01 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
> > On Thu, Dec 12, 2013 at 12:37:50AM +0100, Andreas Noever wrote:
> >>
> >> If I could get Linux to assign enough resources (bus numbers for now)
> >> then I could drop the acpi_osi parameter and make thunderbolt work
> >> after suspend... So, is there an easy way to fix this? (Quirks,
> >> reconfiguring bus number assignments from a platform driver, ...?)
> >
> > I think you are going to have to do a lot more here, what is needed is a
> > whole connection manager for Thunderbolt, emulating what the BIOS does,
> > in order to get all of this working properly.
> >
> > But don't let that stop you from trying, however the work involved is
> > really not trivial at all.
> >
> > good luck,
> >
> > greg k-h
> 
> Actually the thunderbolt part is already working (for non chaining
> devices, see https://lkml.org/lkml/2013/11/28/492 if you are
> interested). I can completely bootstrap the tb side of things. The
> only problem is that if power has been cut by the firmware (during
> boot without osi_acpi=Darwin or after a suspend/resume cycle) then
> Linux does not allocate enough PCI resources...

Ah, that's nice to know, I didn't realize that.

There should be some Intel people around on the list that has access to
a Thunderbolt monitor for testing.  Or, if needed, I can see if I can
expense one, as it would be good to get this working :)

thanks,

greg k-h
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