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    SubjectRe: [PATCH] Add option to passively listen for PCIE hotplug events
    On Tue, Nov 04, 2008 at 11:29:43AM +0900, Kenji Kaneshige wrote:
    > Matthew Garrett wrote:
    > >What do you mean by "not work properly"? The hardware we've tested with
    > >fires events even without an OSHP method being present. That's the case
    > >we're trying to deal with.
    > >
    >
    > Because the explanation of PCI Express Native Hot Plug control bit in
    > _OSC return value in PCI firmware spec says
    >
    > "... If firmware allows the operating system control of this feature,
    > then in the context of the _OSC method, it must ensure that all hot
    > plug events are routed to device interrupts as described in the PCI
    > Express Base Specification. ..."
    >
    > My understanding is that it is not ensured that all hot plug events
    > are routed to device interrupts, if hotplug control is not granted.

    My understanding is that in the worst case the hardware/firmware won't
    give us any events - that's basically equivalent to not having the
    driver loaded at all. On hardware that gives us the events anyway, we
    get some extra functionality.

    Thanks for the feedback!
    --
    Matthew Garrett | mjg59@srcf.ucam.org


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