linux-kernel - Re: [PATCH 03/13] PCI: Add busn

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Date:	Mon, 30 Jan 2012 10:39:29 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Tony Luck <tony.luck@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 03/13] PCI: Add busn_res tracking in core

On Mon, Jan 30, 2012 at 7:35 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Fri, Jan 27, 2012 at 6:49 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>> update pci_scan_root_bus, and pci_scan_bus to insert root bus busn into
>> iobusn_resource tree.
>> -struct pci_bus * __devinit pci_scan_root_bus(struct device *parent, int bus,
>> -               struct pci_ops *ops, void *sysdata, struct list_head *resources)
>> +struct pci_bus * __devinit pci_scan_root_bus_max(struct device *parent, int bus,
>> +               int bus_max, struct pci_ops *ops, void *sysdata,
>> +               struct list_head *resources)
>
> We are adding "scan root bus" interfaces at an alarming rate (I'm
> responsible for most of them, so I'm not blaming you :)).  Could we
> get away without adding this one by just adding a bus number resource
> to the "resources" list?  For example, then an arch could do:
>
>    LIST_HEAD(resources);
>    pci_add_resource(resources, bus_window);
>    pci_add_resource(resources, mem_window);
>    pci_add_resource(resources, io_window);
>    pci_scan_root_bus(..., resources);
>
> If pci_scan_root_bus() didn't find a bus number resource in the list,
> it could fall back to a default max_bus of 255.
>

this pci_scan_root_bus_max is only used for x86 code.  and should be
fixed later.

Yinghai
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