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    SubjectRe: [PATCH 02/11] PCI: Try to allocate mem64 above 4G at first
    On 05/29/2012 01:46 PM, Yinghai Lu wrote:
    > On Tue, May 29, 2012 at 12:03 PM, H. Peter Anvin <> wrote:
    >> On 05/29/2012 11:17 AM, Yinghai Lu wrote:
    >>> pci bridge could support 16bits and 32bits io port.
    >>> but we did not record if 32bits is supported.
    >> Okay, so this is the actual problem, no?
    > their fw could not need kernel help to allocate io ports, or they are
    > only use device that support 32bit ioport.

    That barely parses, never mind makes sense.

    >>> so during allocating, could have allocated above 64k address to non
    >>> 32bit bridge.
    >>> but x86 is ok, because ioport.end always set to 0xffff.
    >>> other arches with IO_SPACE_LIMIT with 0xffffffff or
    >>> 0xffffffffffffffffUL may have problem.
    >> The latter is nonsense, the PCI-side address space is only 32 bits wide.
    > maybe they have unified io include ioport and mem io?

    The bus-side address space should not be more than 32 bits no matter
    what. As Bjorn indicates, you seem to be mixing up bus and cpu
    addresses all over the place.


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      Last update: 2012-05-29 23:21    [W:0.023 / U:2.820 seconds]
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