[PATCH 30/39] PCI: Add pci_bus_extend/shrink_top()
From: Yinghai Lu <yinghai@kernel.org>
Date: 2012-02-29 23:21:06
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. 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
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1.7.7