[lkml]   [2007]   [May]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    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.


    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2007-05-27 01:59    [W:0.020 / U:113.836 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site