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    SubjectRe: [PATCH 1/2] msi: Invert the sense of the MSI enables.
     > > In addition to PCI INTx compatible interrupt emulation, PCI Express
    > > requires support of MSI or MSI-X or both.
    > Which suggests that INTx support is required.
    > I do not find any wording that suggest the opposite.
    > I do see it stated that it is intended to EOL support for INTx at
    > some point.
    > Where did you see it mentioned that INTx was optional?

    I don't see any requirement that a device that generates MSI
    interrupts must also be able to signal the same interrupts via INTx.
    The spec explicitly says:

    "All PCI Express device Functions that are capable of generating
    interrupts must support MSI or MSI-X or both."

    but there is no corresponding explicit requirement that legacy INTx
    mode be supported, so it certainly seems permitted for a device not to
    generate INTx interrupts. In fact as you alluded to, the spec says,

    "The legacy INTx emulation mechanism may be deprecated in a future
    version of this specification."

    and I wouldn't think the intention would be for one version of the
    spec to *require* something that is planned on being deprecated later.

    And the Pathscale guys were pretty confident that their device was
    compliant with the PCIe spec.

    - R.
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      Last update: 2007-05-25 23:11    [W:0.021 / U:40.928 seconds]
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