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

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Message-ID: <CAE9FiQVCQKjPa1dVKhAubvD+d=rudOxLaRMYAr-GAC7eSSz09Q@mail.gmail.com>
Date:	Wed, 26 Jun 2013 15:31:18 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.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 3:26 PM, Yinghai Lu <yinghai@...nel.org> 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
>

BTW, Rafael, looks like that "boot-time" is not accurate here.

During acpi hotplug, firmare could do extra help for us like assign
some resources to pci device bars, so it is NOT "boot-time".

Yinghai
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