[PATCH 09/24] PCI, powerpc: Register busn_res for root buses

[Yinghai Lu]

On Wed, Feb 8, 2012 at 7:58 AM, Bjorn Helgaas <bhelgaas at google.com> wrote:
> On Sat, Feb 4, 2012 at 10:57 PM, Yinghai Lu <yinghai at kernel.org> wrote:
>> Signed-off-by: Yinghai Lu <yinghai at kernel.org>
>> Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
>> Cc: Paul Mackerras <paulus at samba.org>
>> Cc: linuxppc-dev at lists.ozlabs.org
>> ---
>>  arch/powerpc/kernel/pci-common.c |    7 ++++++-
>>  1 files changed, 6 insertions(+), 1 deletions(-)
>>
>> diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
>> index cce98d7..501f29b 100644
>> --- a/arch/powerpc/kernel/pci-common.c
>> +++ b/arch/powerpc/kernel/pci-common.c
>> @@ -1732,6 +1732,8 @@ void __devinit pcibios_scan_phb(struct pci_controller *hose)
>>        bus->secondary = hose->first_busno;
>>        hose->bus = bus;
>>
>> +       pci_bus_insert_busn_res(bus, hose->first_busno, hose->last_busno);
>> +
>>        /* Get probe mode and perform scan */
>>        mode = PCI_PROBE_NORMAL;
>>        if (node && ppc_md.pci_probe_mode)
>> @@ -1742,8 +1744,11 @@ void __devinit pcibios_scan_phb(struct pci_controller *hose)
>>                of_scan_bus(node, bus);
>>        }
>>
>> -       if (mode == PCI_PROBE_NORMAL)
>> +       if (mode == PCI_PROBE_NORMAL) {
>> +               pci_bus_update_busn_res_end(bus, 255);
>>                hose->last_busno = bus->subordinate = pci_scan_child_bus(bus);
>> +               pci_bus_update_busn_res_end(bus, bus->subordinate);
>> +       }
>
> The only architecture-specific thing here is discovering the range of
> bus numbers below a host bridge.  The architecture should not have to
> mess around with pci_bus_update_busn_res_end() like this.  It should
> be able to say "here's my bus number range" (and of course the PCI
> core can default to 0-255 if the arch doesn't supply a range) and the
> core should take care of the rest.

during the pci_scan_child_bus,  child bus busn_res will be inserted
under parent bus busn_res.

So need to make sure parent busn_res.end is bigger enough.


Yinghai