diff options
author | Yinghai Lu <yinghai@kernel.org> | 2012-09-17 22:24:28 -0700 |
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committer | Yinghai Lu <yinghai@kernel.org> | 2012-09-17 22:24:28 -0700 |
commit | 41a1d23d5f8daf38dba2b76634036beb47743b23 (patch) | |
tree | c272bbd1f10b18c870cb3cc06498b7f99298b5bc | |
parent | 4f2300d956a338a95bdc9e15df94f886f607abda (diff) | |
download | linux-yinghai-41a1d23d5f8daf38dba2b76634036beb47743b23.tar.gz |
PCI: Add pci_bus_extend/shrink_top()
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>
-rw-r--r-- | 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 54ff6fd6854ea..471f7a331c840 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -864,6 +864,34 @@ 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 |