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author | Bjorn Helgaas <bhelgaas@google.com> | 2014-01-24 19:54:36 +0100 |
---|---|---|
committer | Bjorn Helgaas <bhelgaas@google.com> | 2014-02-03 18:38:35 +0100 |
commit | afcf21c2beca6604dbdc24fed1624c2499a85e7d (patch) | |
tree | f6845bbb0b38f56dec7a2434800f9b0bad54e87a | |
parent | x86/PCI: Drop return value of pcibios_scan_root() (diff) | |
download | linux-afcf21c2beca6604dbdc24fed1624c2499a85e7d.tar.xz linux-afcf21c2beca6604dbdc24fed1624c2499a85e7d.zip |
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>
-rw-r--r-- | arch/x86/include/asm/topology.h | 1 | ||||
-rw-r--r-- | arch/x86/pci/bus_numa.c | 10 |
2 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h index d35f24e231cd..09046a1a6c35 100644 --- a/arch/x86/include/asm/topology.h +++ b/arch/x86/include/asm/topology.h @@ -131,6 +131,7 @@ static inline void arch_fix_phys_package_id(int num, u32 slot) } struct pci_bus; +int x86_pci_root_bus_node(int bus); void x86_pci_root_bus_resources(int bus, struct list_head *resources); #ifdef CONFIG_SMP 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); |