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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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