• Gavin Shan's avatar
    powerpc/pci: Partial tree hotplug support · ab444ec9
    Gavin Shan authored
    When EEH error happens to one specific PE, the device drivers
    of its attached EEH devices (PCI devices) are checked to see
    the further action: reset with complete hotplug, or reset without
    hotplug. However, that's not enough for those PCI devices whose
    drivers can't support EEH, or those PCI devices without driver.
    So we need do so-called "partial hotplug" on basis of PCI devices.
    In the situation, part of PCI devices of the specific PE are
    unplugged and plugged again after PE reset.
    
    The patch changes pcibios_add_pci_devices() so that it can support
    full hotplug and so-called "partial" hotplug based on device-tree
    or real hardware. It's notable that pci_of_scan.c has been changed
    for a bit in order to support the "partial" hotplug based on dev-tree.
    
    Most of the generic code already supports that, we just need to
    plumb it properly on our side.
    Signed-off-by: default avatarGavin Shan <shangw@linux.vnet.ibm.com>
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    ab444ec9
pci-hotplug.c 3.29 KB