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    Subject[RFC/RFT PATCH 2/3] PCI: Add call to set-up NUMA node for struct pci_bus devices
    Date
    The member dev in struct pci_bus represents the kernel struct
    device representation of a PCI bus, inclusive of its NUMA node.
    When a PCI host bridge is registered, initialize the corresponding
    struct pci_bus.dev member NUMA node and add code in
    pci_alloc_child_bus() to propagate the NUMA node set-up through the PCI
    bus hierarchy (ie child nodes are in the same NUMA node as the parent).

    Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
    Cc: Bjorn Helgaas <bhelgaas@google.com>
    ---
    drivers/pci/probe.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
    index dfc9a27..5739a993 100644
    --- a/drivers/pci/probe.c
    +++ b/drivers/pci/probe.c
    @@ -770,6 +770,7 @@ int pci_register_host_bridge(struct pci_host_bridge *bridge)
    device_enable_async_suspend(bus->bridge);
    pci_set_bus_of_node(bus);
    pci_set_bus_msi_domain(bus);
    + set_dev_node(&bus->dev, pci_bus_find_numa_node(bus));

    if (!parent)
    set_dev_node(bus->bridge, pcibus_to_node(bus));
    @@ -861,7 +862,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
    */
    child->dev.class = &pcibus_class;
    dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
    -
    + set_dev_node(&child->dev, dev_to_node(&parent->dev));
    /*
    * Set up the primary, secondary and subordinate
    * bus numbers.
    --
    2.10.0
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