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authorBjorn Helgaas <bhelgaas@google.com>2014-01-24 22:54:36 +0400
committerBjorn Helgaas <bhelgaas@google.com>2014-02-03 21:38:35 +0400
commitafcf21c2beca6604dbdc24fed1624c2499a85e7d (patch)
treef6845bbb0b38f56dec7a2434800f9b0bad54e87a /arch/x86/pci/bus_numa.c
parent49886cf4c4cd2ef77d0698c389199ad3e236f48e (diff)
downloadlinux-afcf21c2beca6604dbdc24fed1624c2499a85e7d.tar.xz
x86/PCI: Add x86_pci_root_bus_node() to look up NUMA node from PCI bus
The AMD early_fill_mp_bus_info() already allocates a struct pci_root_info for each PCI host bridge it finds, and that structure contains the NUMA node number. We don't need to keep the same information in the mp_bus_to_node[] table. This adds x86_pci_root_bus_node(), which returns the NUMA node number, or NUMA_NO_NODE if the node is unknown. Note that unlike get_mp_bus_to_node(), x86_pci_root_bus_node() only works for root buses. For example, if amd_bus.c finds a host bridge on node 1 to [bus 00-0f], get_mp_bus_to_node() returns 1 for any bus between 00 and 0f, but x86_pci_root_bus_node() returns 1 for bus 00 and NUMA_NO_NODE for buses 01-0f. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'arch/x86/pci/bus_numa.c')
-rw-r--r--arch/x86/pci/bus_numa.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/pci/bus_numa.c b/arch/x86/pci/bus_numa.c
index c2735feb2508..2e36a4469549 100644
--- a/arch/x86/pci/bus_numa.c
+++ b/arch/x86/pci/bus_numa.c
@@ -20,6 +20,16 @@ static struct pci_root_info *x86_find_pci_root_info(int bus)
return NULL;
}
+int x86_pci_root_bus_node(int bus)
+{
+ struct pci_root_info *info = x86_find_pci_root_info(bus);
+
+ if (!info)
+ return NUMA_NO_NODE;
+
+ return info->node;
+}
+
void x86_pci_root_bus_resources(int bus, struct list_head *resources)
{
struct pci_root_info *info = x86_find_pci_root_info(bus);