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From: Bjorn Helgaas <bhelgaas@google.com>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	Jesse Barnes <jbarnes@virtuousgeek.org>,
	"Ronciak, John" <john.ronciak@intel.com>,
	"Penner, Miles J" <miles.j.penner@intel.com>,
	Bruce Allan <bruce.w.allan@intel.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Heikki Krogerus <heikki.krogerus@linux.intel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"x86@kernel.org" <x86@kernel.org>
Subject: Re: [PATCH 6/6] x86/PCI: quirk Thunderbolt PCI-to-PCI bridges
Date: Wed, 26 Jun 2013 16:55:05 -0600	[thread overview]
Message-ID: <CAErSpo68p7_0zsnBjD=sb14vs0QyCZuN+RTvib2-ZOYUiZn6pw@mail.gmail.com> (raw)
In-Reply-To: <CAE9FiQVCQKjPa1dVKhAubvD+d=rudOxLaRMYAr-GAC7eSSz09Q@mail.gmail.com>

On Wed, Jun 26, 2013 at 4:31 PM, Yinghai Lu <yinghai@kernel.org> wrote:
> On Wed, Jun 26, 2013 at 3:26 PM, Yinghai Lu <yinghai@kernel.org> wrote:
>> On Wed, Jun 26, 2013 at 3:18 PM, Bjorn Helgaas <bhelgaas@google.com> wrote:
>>> On Tue, Jun 25, 2013 at 10:22 AM, Mika Westerberg
>>> <mika.westerberg@linux.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.
> ...
> During acpi hotplug, firmare could do extra help for us like assign
> some resources to pci device bars, so it is NOT "boot-time".

Really?  How can firmware assign BARs at hotplug-time?  I mean,
obviously firmware *can* write things to the BARs before giving the
device to the OS, but how would it know what to write?  I assume the
OS owns the address space, and it can change the upstream bridge
windows or the BARs of another device on the bus at any time, subject
to the OS's own issues as far as quiescing or unbinding drivers, etc.,
but without coordinating with the BIOS.

Bjorn

  parent reply	other threads:[~2013-06-26 22:55 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-25 16:22 [PATCH 0/6] Thunderbolt workarounds take 2 Mika Westerberg
2013-06-25 16:22 ` [PATCH 1/6] PCI: acpiphp: do not check for SLOT_ENABLED in enable_device() Mika Westerberg
2013-06-26 23:28   ` Bjorn Helgaas
2013-06-27 13:25     ` Kirill A. Shutemov
2013-06-28  9:51     ` Kirill A. Shutemov
2013-06-28 17:00       ` Bjorn Helgaas
2013-06-28 18:54         ` Rafael J. Wysocki
2013-07-01  9:32           ` Mika Westerberg
2013-07-01 14:01             ` Rafael J. Wysocki
2013-07-01 18:36               ` Mika Westerberg
2013-07-02  1:29                 ` Rafael J. Wysocki
2013-07-02 16:40                   ` Bjorn Helgaas
2013-07-02 20:29                     ` Rafael J. Wysocki
2013-07-02 20:31                       ` Mika Westerberg
2013-07-02 20:49                         ` Rafael J. Wysocki
2013-06-25 16:22 ` [PATCH 2/6] PCI: acpiphp: enable_device(): rescan even if no new devices on slot Mika Westerberg
2013-06-26 23:37   ` Bjorn Helgaas
2013-06-27 13:02     ` Mika Westerberg
2013-06-27 16:32       ` Mika Westerberg
2013-06-27 16:50         ` Bjorn Helgaas
2013-06-27 16:54         ` Bjorn Helgaas
2013-06-27  1:20   ` Yinghai Lu
2013-06-27 13:04     ` Mika Westerberg
2013-06-25 16:22 ` [PATCH 3/6] PCI: introduce pci_trim_stale_devices() Mika Westerberg
2013-06-25 17:47   ` Andy Shevchenko
2013-06-25 17:56     ` Kirill A. Shutemov
2013-06-28 19:59   ` Rafael J. Wysocki
2013-06-25 16:22 ` [PATCH 4/6] PCI: acpiphp: check for new devices on enabled host Mika Westerberg
2013-06-25 18:04   ` Andy Shevchenko
2013-06-26  9:39     ` Kirill A. Shutemov
2013-06-27 19:05   ` Yinghai Lu
2013-06-28  9:33     ` Kirill A. Shutemov
2013-06-28 16:22       ` Yinghai Lu
2013-06-28 20:04         ` Rafael J. Wysocki
2013-06-25 16:22 ` [PATCH 5/6] PCI: acpiphp: look _RMV method a bit deeper in the hierarhcy Mika Westerberg
2013-06-25 18:15   ` Andy Shevchenko
2013-06-25 18:31     ` Mika Westerberg
2013-06-25 18:31       ` Andy Shevchenko
2013-06-25 18:51         ` Mika Westerberg
2013-06-25 19:30           ` Andy Shevchenko
2013-07-02 10:44   ` Kirill A. Shutemov
2013-07-02 17:09     ` Bjorn Helgaas
2013-07-02 17:45       ` Kirill A. Shutemov
2013-07-02 20:48         ` Rafael J. Wysocki
2013-07-02 20:40       ` Rafael J. Wysocki
2013-06-25 16:22 ` [PATCH 6/6] x86/PCI: quirk Thunderbolt PCI-to-PCI bridges Mika Westerberg
2013-06-25 21:15   ` Jesse Barnes
2013-06-26 12:17     ` Mika Westerberg
2013-06-26 15:04       ` Greg Kroah-Hartman
2013-06-26 20:59       ` Bjorn Helgaas
2013-06-26 22:15         ` Alex Williamson
2013-06-27 13:09           ` Mika Westerberg
2013-06-26 22:18   ` Bjorn Helgaas
2013-06-26 22:26     ` Yinghai Lu
2013-06-26 22:31       ` Yinghai Lu
2013-06-26 22:44         ` Rafael J. Wysocki
2013-06-26 22:38           ` Yinghai Lu
2013-06-26 22:55         ` Bjorn Helgaas [this message]
2013-06-26 23:56           ` Yinghai Lu
2013-06-27 16:00             ` Bjorn Helgaas
2013-06-27 17:27               ` Yinghai Lu
2013-06-27 13:58       ` Mika Westerberg
2013-06-27 13:54     ` Mika Westerberg
2013-06-27 16:27       ` Mika Westerberg
2013-06-27 17:18         ` Yinghai Lu
2013-06-25 23:24 ` [PATCH 0/6] Thunderbolt workarounds take 2 Rafael J. Wysocki
2013-06-26  7:25   ` Mika Westerberg
2013-06-26 12:45     ` Rafael J. Wysocki
2013-06-26 19:48       ` Bjorn Helgaas
2013-06-26 20:01         ` Rafael J. Wysocki
2013-06-26 19:55           ` Bjorn Helgaas

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