Messages in this thread Patch in this message | | | From | Yinghai Lu <> | Subject | [PATCH -v12 04/15] PCI: Add pci_bus_extend/shrink_top() | Date | Tue, 26 Jun 2012 11:53:58 -0700 |
| |
Extend or shrink bus and parent buses top (subordinate)
Extended range is verified safe range, and stop at recorded parent_res.
-v2: Remove busn_res change, it is updated in other function.
Signed-off-by: Yinghai Lu <yinghai@kernel.org> --- drivers/pci/probe.c | 28 ++++++++++++++++++++++++++++ 1 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index cd06c84..44c42ae 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -689,6 +689,34 @@ static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max) } } +static void __devinit pci_bus_extend_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; + pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, + parent->busn_res.end); + 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_shrink_top(struct pci_bus *parent, + long size, struct resource *parent_res) +{ + pci_bus_extend_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
| |