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    Subject[PATCH 28/36] PCI: Add pci_bus_extend/shrink_top()
    Date
    extend or shrink bus and parent buses top (subordinate)

    extended range is verified safe range, and stop at recorded parent_res.

    Signed-off-by: Yinghai Lu <yinghai@kernel.org>
    ---
    drivers/pci/probe.c | 36 ++++++++++++++++++++++++++++++++++++
    1 files changed, 36 insertions(+), 0 deletions(-)

    diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
    index 1c07aba..96259f8 100644
    --- a/drivers/pci/probe.c
    +++ b/drivers/pci/probe.c
    @@ -655,6 +655,42 @@ static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
    }
    }

    +static void __devinit pci_bus_update_top(struct pci_bus *parent,
    + long size, struct resource *parent_res)
    +{
    + struct resource *res;
    +
    + if (!size)
    + return;
    +
    + while (parent) {
    + res = &parent->busn_res;
    + if (res == parent_res)
    + break;
    + res->end += size;
    + parent->subordinate += size;
    + pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS,
    + parent->subordinate);
    + dev_printk(KERN_DEBUG, &parent->dev,
    + "busn_res: %s %02lx to %pR\n",
    + (size > 0) ? "extended" : "shrunk",
    + abs(size), res);
    + parent = parent->parent;
    + }
    +}
    +
    +static void __devinit pci_bus_extend_top(struct pci_bus *parent,
    + long size, struct resource *parent_res)
    +{
    + pci_bus_update_top(parent, size, parent_res);
    +}
    +
    +static void __devinit pci_bus_shrink_top(struct pci_bus *parent,
    + long size, struct resource *parent_res)
    +{
    + pci_bus_update_top(parent, -size, parent_res);
    +}
    +
    /*
    * If it's a bridge, configure it and scan the bus behind it.
    * For CardBus bridges, we don't scan behind as the devices will
    --
    1.7.7


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