Messages in this thread | | | Date | Wed, 20 Dec 2000 14:06:12 -0500 | From | Pete Toscano <> | Subject | usb + smp + 2.4.0test = pci irq routing problem? |
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hello,
i've been working with johannes erdfelt in fixing a problem with usb on my machine. it's a dual pentium 3 system on a tyan tiger 133 mobo (via apollo pro 133a chipset). basically, usb works when i don't enable smp or when i disable apic on smp-enabled kernels. he believes that we're seeing a pci irq routing problem and that i should contact martin mares about this problem. (i've written him a couple times, but have heard nothing, so i figure he's either away, busy, or whatnot and i thought i'd try lkml for help.)
i have an ethernet card on my system and it shares an irq with usb-uhci. in this state, i see interrupts for the irq eth0 and usb-uhci share. when i remove the ethernet card, i get this in /proc/interrupts:
CPU0 CPU1 0: 37124 19379 IO-APIC-edge timer 1: 146 84 IO-APIC-edge keyboard 2: 0 0 XT-PIC cascade 8: 1 0 IO-APIC-edge rtc 14: 1640 1910 IO-APIC-edge ide0 15: 1 1 IO-APIC-edge ide1 16: 29 28 IO-APIC-level ide2 18: 26 27 IO-APIC-level aic7xxx 19: 0 0 IO-APIC-level usb-uhci NMI: 56419 56419 LOC: 56392 56403 ERR: 0
from this, je thought that this was a pci irq routing problem and not a usb problem.
because of this, running an smp-enabled kernel with apic enabled yields the "device not accepting new address" error on startup (usb is compiled into my kernel, so i'm not sure what part is actually triggering the error) and none of the usb devices work. (yes, i've checked the mps and tried both 1.1 and 1.4.) if i disable apic or don't use an smp-enabled kernel, everything works fine. this has been happening for quite a while, at least since 2.4.0test9, right up to test13-pre3.
i really don't know what kind of information would be useful for debugging this problem. i don't know much about kernel programming, but i am more than willing to try any kind of patch or give any information about my system that could help squash this bug. it's a problem that quite a few people on the linux-usb list are complaining about (all, it seems, have this via chipset). please let me know if there's any more info i can provide, i'm more than happy to help.
thanks, pete
-- Pete Toscano p:sigsegv@psinet.com w:pete@research.netsol.com GPG fingerprint: D8F5 A087 9A4C 56BB 8F78 B29C 1FF0 1BA7 9008 2736 [unhandled content-type:application/pgp-signature] | |