linux-kernel - Re: [PATCH 6/6] x86/PCI: quirk Thunderbolt PCI-to-PCI bridges

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Date:	Thu, 27 Jun 2013 16:58:19 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"Ronciak, John" <john.ronciak@...el.com>,
	"Penner, Miles J" <miles.j.penner@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH 6/6] x86/PCI: quirk Thunderbolt PCI-to-PCI bridges

On Wed, Jun 26, 2013 at 03:26:59PM -0700, Yinghai Lu wrote:
> On Wed, Jun 26, 2013 at 3:18 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> > On Tue, Jun 25, 2013 at 10:22 AM, Mika Westerberg
> > <mika.westerberg@...ux.intel.com> wrote:
> >> Thunderbolt PCI-to-PCI bridges typically use BIOS "assisted" enumeration.
> >> This means that the BIOS will allocate bridge resources based on some
> >> assumptions of a maximum Thunderbolt chain. It also disables native PCIe
> >> hotplug of the root port where the Thunderbolt host router is connected.
> 
> We should not need tricks in this patch after
> 
> https://patchwork.kernel.org/patch/2766521/
> 
> [2/3] PCI / ACPI: Use boot-time resource allocation rules during hotplug

Unfortunately that patch is not enough :-( We still need to make sure that
we don't add anything to the bridge window sizes like __pci_bus_size_bridges()
is currently doing (e.g similar to pci=hpmemsize=0,hpiosize=0 for the
Thunderbolt bridges).
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