linux-kernel - Re: [PATCH 08/18] PCI, powerpc: Register busn

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Date:	Mon, 27 Feb 2012 22:36:48 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Yinghai Lu <yinghai@...nel.org>
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>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 08/18] PCI, powerpc: Register busn_res for root buses

On Mon, Feb 27, 2012 at 7:09 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: linuxppc-dev@...ts.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 910b9de..ae5ae5f 100644
> --- a/arch/powerpc/kernel/pci-common.c
> +++ b/arch/powerpc/kernel/pci-common.c
> @@ -1660,6 +1660,8 @@ 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)
> @@ -1670,8 +1672,11 @@ 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);
> +       }

There's a lot of powerpc code that does this:

    bus_range = of_get_property(pcictrl, "bus-range", &len);
    hose->first_busno = bus_range[0];
    hose->last_busno = bus_range[1];

That *looks* like it is discovering the bus number aperture.  Is it?
If it is, why are we using the largest bus number found by
pci_scan_child_bus() rather than "last_busno"?

Bjorn
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