[PATCH -v12 04/15] PCI: Add pci_bus_extend/shrink_top()
From: Yinghai Lu <yinghai@kernel.org>
Date: 2012-06-26 18:54:56
Also in:
linux-pci, lkml
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
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
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1.7.7