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    Subjectinterrupts across PCI bridge(s) not handled
    Date
    I have a pci backplane extender, with 4 cards 
    (named piraq) in it. The cards are detected by
    the PCI system, and irqs 92-95 are assigned,
    as shown in /var/log/messages:

    kernel: PCI->APIC IRQ transform: (B6,I4,P0) -> 93
    kernel: PCI->APIC IRQ transform: (B6,I6,P0) -> 95
    kernel: PCI->APIC IRQ transform: (B6,I7,P0) -> 92
    kernel: PCI->APIC IRQ transform: (B6,I9,P0) -> 94

    My driver loads happily, with succesful registering
    of these interrupts. However, the interrupts don't
    get handled properly, and /proc/interrupts shows that
    they have not been correctly setup:

    CPU0 CPU1
    0: 4946 10162 IO-APIC-edge timer
    1: 53 131 IO-APIC-edge keyboard
    2: 0 0 XT-PIC cascade
    8: 1 0 IO-APIC-edge rtc
    12: 4816 0 IO-APIC-edge PS/2 Mouse
    15: 903 1 IO-APIC-edge ide1
    16: 0 0 IO-APIC-level usb-uhci
    18: 0 0 IO-APIC-level usb-uhci
    19: 0 0 IO-APIC-level usb-uhci
    20: 3 0 IO-APIC-level ohci1394
    23: 0 0 IO-APIC-level ehci_hcd
    24: 748 0 IO-APIC-level eth0
    25: 43 0 IO-APIC-level ioc0
    26: 43 0 IO-APIC-level ioc1
    50: 9142 4235 IO-APIC-level ioc2
    92: 0 0 none piraq
    93: 0 0 none piraq
    94: 0 0 none piraq
    95: 0 0 none piraq
    NMI: 0 0
    LOC: 15017 15016
    ERR: 0
    MIS: 0

    If I boot with "noapic", the interrupts do get
    assigned to XT-PIC, and will trigger correctly.

    Same results are seen in 2.4.22 and 2.6.0-test9.

    Thanks,
    Charlie

    N.B. System is Dell 650 w/ dual Xeons.
    Backplane extender is a Magma. This scheme uses
    a PCI interconnect card in both the Dell and
    the Magma, with a connecting cable.

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