• David S. Miller's avatar
    [SPARC64]: Avoid JBUS errors on some Niagara systems. · 46b30493
    David S. Miller authored
    Doing PCI config space accesses to non-present PCI slots
    can result in fatal JBUS errors if the PCI config access
    hypervisor call is performed on cpus other than the boot
    cpu.
    
    PCI config space accesses to present PCI slots works just
    fine.
    
    Recursively traverse the OBP device tree under the PCI
    controller node and record all present device IDs into
    a small hash table.
    
    Avoid the hypervisor call for any PCI config space access
    attempt for a device not recorded in the hash table.
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    46b30493
pci_sun4v.c 29 KB