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    SubjectRe: [PATCH 6/6] x86-64: Support for multiple MSIs

    * Matthew Wilcox <matthew@wil.cx> wrote:

    > Add support for allocating an aligned block of interrupt vectors.
    > Allow interrupts to have up to 32 subchannels. Implement the
    > arch_setup_msi_irqs() and arch_teardown_msi_irqs() interfaces.
    >
    > Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
    > ---
    > arch/x86/kernel/io_apic_64.c | 221 +++++++++++++++++++++++++++++++++++------
    > arch/x86/kernel/irq_64.c | 2 +-
    > include/asm-x86/irq_64.h | 2 +
    > 3 files changed, 191 insertions(+), 34 deletions(-)

    hm, please implement this symmetrically on 64-bit and 32-bit as well.
    That will need more IRQ infrastructure changes but that should be OK as
    it will reduce the gap between the 32-bit and 64-bit side instead of
    widening it. A good starting point would be to unify/generalize the IRQ
    vector allocators. (and that would get most of what you need for
    multi-vector MSI)

    Ingo


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