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    SubjectRe: PCIE
    On Sat, May 26, 2007 at 03:49:10PM -0700, David Miller wrote:
    > From: Manu Abraham <>
    > Date: Sat, 26 May 2007 19:03:12 +0400
    > > i presume then i shouldn't be using IRQF_SHARED, if using MSI.
    > That's actually a really good question.
    > It is likely architecture dependant whether the PCI controller wires
    > unique MSI interrupts to shared cpu interrupt lines.

    MSI (and MSI-X) vectors are required to be exclusive.
    I submitted that change to pci.txt last year:

    and ISTR I've posted that bit of the PCI spec a few years ago.
    But it probably was to linux-pci mailing list only.

    > I can imagine many systems where the cpu simply doesn't have enough
    > interrupt pins to uniquely identify every possible MSI interrupt
    > source.

    The cpus haven't been using interrupt pins for a long time now.
    Anything with a Local-xAPIC is already using transactions to
    signal interrupts even if the OS isn't aware of it.


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      Last update: 2007-05-27 01:59    [W:0.022 / U:14.672 seconds]
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