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    PCI: Add pci_enable_device_{io,mem} intefaces · b718989d
    Benjamin Herrenschmidt 提交于
    The pci_enable_device_bars() interface isn't well suited to PCI
    because you can't actually enable/disable BARs individually on
    a device. So for example, if a device has 2 memory BARs 0 and 1,
    and one of them (let's say 1) has not been successfully allocated
    by the firmware or the kernel, then enabling memory decoding
    shouldn't be permitted for the entire device since it will decode
    whatever random address is still in that BAR 1.
    
    So a device must be either fully enabled for IO, for Memory, or
    for both. Not on a per-BAR basis.
    
    This provides two new functions, pci_enable_device_io() and
    pci_enable_device_mem() to replace pci_enable_device_bars(). The
    implementation internally builds a BAR mask in order to be able
    to use existing arch infrastructure.
    Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
    Acked-by: NIvan Kokshaysky <ink@jurassic.park.msu.ru>
    Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
    b718989d
pci.h 33.5 KB