• Yinghai Lu's avatar
    x86: get mp_bus_to_node early · 871d5f8d
    Yinghai Lu authored
    Currently, on an amd k8 system with multi ht chains, the numa_node of
    pci devices under /sys/devices/pci0000:80/* is always 0, even if that
    chain is on node 1 or 2 or 3.
    
    Workaround: pcibus_to_node(bus) is used when we want to get the node that
    pci_device is on.
    
    In struct device, we already have numa_node member, and we could use
    dev_to_node()/set_dev_node() to get and set numa_node in the device.
    set_dev_node is called in pci_device_add() with pcibus_to_node(bus),
    and pcibus_to_node uses bus->sysdata for nodeid.
    
    The problem is when pci_add_device is called, bus->sysdata is not assigned
    correct nodeid yet. The result is that numa_node will always be 0.
    
    pcibios_scan_root and pci_scan_root could take sysdata. So we need to get
    mp_bus_to_node mapping before these two are called, and thus
    get_mp_bus_to_node could get correct node for sysdata in root bus.
    
    In scanning of the root bus, all child busses will take parent bus sysdata.
    So all pci_device->dev.numa_node will be assigned correctly and automatically.
    
    Later we could use dev_to_node(&pci_dev->dev) to get numa_node, and we
    could also could make other bus specific device get the correct numa_node
    too.
    
    This is an updated version of pci_sysdata and Jeff's pci_domain patch.
    
    [ mingo@elte.hu: build fix ]
    Signed-off-by: default avatarYinghai Lu <yinghai.lu@sun.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
    871d5f8d
common.c 11.7 KB