linux-kernel - Re: [PATCH v3 00/22] PCI: Iterate pci host bridge instead of pci root bus

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Date:	Wed, 6 Feb 2013 15:31:39 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Myron Stowe <myron.stowe@...il.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Tony Luck <tony.luck@...el.com>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Toshi Kani <toshi.kani@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 00/22] PCI: Iterate pci host bridge instead of pci root bus

On Wed, Feb 6, 2013 at 3:02 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Wed, Feb 6, 2013 at 3:05 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>> On Wednesday, February 06, 2013 01:53:50 PM Yinghai Lu wrote:
>>> On Wed, Feb 6, 2013 at 1:43 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>>> > On Wednesday, February 06, 2013 01:28:27 PM Yinghai Lu wrote:
>>> >> so you still did not answer you want 1 or 2 yet:
>>> >>
>>> >> for sgi_hotplug,
>>> >>
>>> >> 1. still keep the module support, and register acpi_pci_driver later.
>>> >> 2. built-in support only, and need to register acpi_pci_driver early.
>>> >
>>> > Please work with the assumption that acpi_pci_driver is not going to be there
>>> > any more.
>>> >
>>>
>>> I think I could change ioapic and iommu hotplug to weak add/remove because they
>>> should be built-in by nature.
>>>
>>> but how about others like sgi_hotplug etc?
>
> I think that could be handled with pcibios_root_bridge_prepare() or
> something similar -- something that happens in the "add host bridge"
> path.  I'm not saying we necessarily have all the right hooks in place
> yet.  It's just that I'd rather figure out what the right hooks *are*
> and add them if necessary, than just convert pci_root_buses to
> for_each_pci_host_bridge().

so we will have all built-in for apci_pci_driver and call add/remove directly?

BTW, looks like sgi_hotplug may need some time to convert ...
Also not sure who can test it.

>
>> I'd really prefer to wait for the patchset removing acpi_pci_driver (from
>> Myron) before proceeding with more changes in that area.
>>
>> Myron, do you have a prototype based on the current linux-next?
>
> I think it's really the acpiphp/pciehp issue that's holding up the
> removal of acpi_pci_driver.  I'm not sure if anybody's working on
> that.

Myron's last Dec's version would split all acpi_pci_driver's
add/remove into acpi_pci_root_add/remove.

other way is use host-bridge nodifier, looks like that is not favorable.

BTW, looks like I could put add/remove calling directly in
acpi_pci_root_add/remove
for ioapic and iommu.

Thanks

Yinghai
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