• Kimball Murray's avatar
    ACPI: SCI interrupt source override · 281ea49b
    Kimball Murray authored
    The Linux group at Stratus Technologies has come across an issue with SCI
    routing under ACPI.  We were bitten by this when we made an x86_64 platform
    whose BIOS provides an Interrupt Source Override for the SCI itself.
    Apparently the override has no effect for the System Control Interrupt, and
    this appears to be because of the way the SCI is setup in the ACPI code.
    It does not handle the case where busirq != gsi.
    
    The code that sets up the SCI routing assumes that bus irq == global irq.
    So there is simply no provision for telling it otherwise.  The attached
    patch provides this mechanism.
    
    This patch provided by David Bulkow, was tested on an i386 platform, which
    does not use the SCI override, and also on an x86_64 platform which does
    use an override.
    Signed-off-by: default avatarDavid Bulkow <david.bulkow@stratus.com>
    Cc: Andi Kleen <ak@muc.de>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLen Brown <len.brown@intel.com>
    281ea49b
boot.c 30.7 KB