linux-kernel - Re: [PATCH 02/15] PCI: Add iobusn

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Date:	Fri, 3 Feb 2012 09:19:16 -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>,
	Dominik Brodowski <linux@...inikbrodowski.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 02/15] PCI: Add iobusn_resource

On Fri, Feb 3, 2012 at 8:36 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Wed, Feb 1, 2012 at 2:43 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>> also add busn_res into struct pci_bus.
>>
>> will use them to have bus number resource tree.
>
> Will you make this tree visible in /proc?  Seems like that would be
> useful for debugging and for symmetry with /proc/iomem and
> /proc/ioports.

will give it try.

>
...
>> @@ -419,6 +419,7 @@ struct pci_bus {
>>        struct list_head slots;         /* list of slots on this bus */
>>        struct resource *resource[PCI_BRIDGE_RESOURCE_NUM];
>>        struct list_head resources;     /* address space routed to this bus */
>> +       struct resource busn_res;       /* track registered bus num range */
>
> Is this different from bus.secondary and bus.subordinate?  Do we need
> both busn_res and secondary/subordinate?  If we need both, in what
> circumstance with they contain different information?

yes,  sometime it

for non-peer root bus just after scan. and at that time will set
busn_res.end correctly according to subordinate.

for peer root bus, busn_res.end could be bigger than bus subordinate

Yinghai
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