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

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Date:	Thu, 12 Dec 2013 20:56:56 +0100
From:	Andreas Noever <andreas.noever@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
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 Thu, Dec 12, 2013 at 1:21 AM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Wed, Dec 11, 2013 at 3:37 PM, Andreas Noever
> <andreas.noever@...il.com> 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, ...?)
>
> please check if busn_alloc at
>
> git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git
> for-pci-busn-alloc-3.14
>
> could help.

It seems to help. The initial assignment looks good:
           +-01.1-[05-9b]----00.0-[06-27]--+-00.0-[07]----00.0  Intel
Corporation DSL3510 Thunderbolt Port [Cactus Ridge]
           |                               +-03.0-[08-0f]--
           |                               +-04.0-[10-17]--
           |                               +-05.0-[18-1f]--
           |                               \-06.0-[20-27]--
After hotplug it looks like this:
           +-01.1-[05-9b]----00.0-[06-29]--+-00.0-[07]----00.0  Intel
Corporation DSL3510 Thunderbolt Port [Cactus Ridge]
           |
+-03.0-[08-11]----00.0-[09-11]----00.0-[0a-11]----00.0  Broadcom
Corporation NetXtreme BCM57762 Gigabit Ethernet PCIe
           |                               +-04.0-[10-17]--
           |                               +-05.0-[18-1f]--
           |                               \-06.0-[20-27]--
(Note that the bridge numbers are not disjoint)

dmesg is attached.

What is the status of the patch? Will it be merged for 3.14?

Cheers,
Andreas

Download attachment "dmesg_busnr" of type "application/octet-stream" (26807 bytes)