Xen 4.0 + PVOPS + Intel VTD + USB EHCI = BUG()

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

> > The kernel output. Can you boot the pvops kernel without Xen and provide
> > the 'dmesg' and 'cat /proc/interrupts' output please?
> 
> I attached two files with the output.

> Initializing cgroup subsys cpuset
> Initializing cgroup subsys cpu
> Linux version 2.6.31.6-pvops-dom0 (dpquigl@moss-wolverine.epoch.ncsc.mil) (gcc version 4.4.1 20090725 (Red Hat 4.4.1-2) (GCC) ) #7 SMP Tue Jan 26 12:09:38 EST 2010
> Command line: ro root=/dev/mapper/VolGroup-lv_root console=tty0 console=ttyS0,115200n8
> KERNEL supported cpus:
>   Intel GenuineIntel
>   AMD AuthenticAMD
>   Centaur CentaurHauls
> BIOS-provided physical RAM map:

... snip ..
> pci 0000:00:1a.0: reg 20 io port: [0xff20-0xff3f]
> pci 0000:00:1a.1: reg 20 io port: [0xff00-0xff1f]
> pci 0000:00:1a.2: reg 20 io port: [0xfc00-0xfc1f]
> pci 0000:00:1a.7: reg 10 32bit mmio: [0xfebda000-0xfebda3ff]
> pci 0000:00:1a.7: PME# supported from D0 D3hot D3cold
> pci 0000:00:1a.7: PME# disabled

... snip ..
> IOMMU: Setting identity map for device 0000:00:1a.0 [0xbfe58000 - 0xbfe70000]
> IOMMU: Setting identity map for device 0000:00:1a.1 [0xbfe58000 - 0xbfe70000]
> IOMMU: Setting identity map for device 0000:00:1a.2 [0xbfe58000 - 0xbfe70000]
> IOMMU: Setting identity map for device 0000:00:1a.7 [0xbfe58000 - 0xbfe70000]

... snip ...
> ehci_hcd 0000:00:1a.7: PCI INT C -> GSI 22 (level, low) -> IRQ 22
> ehci_hcd 0000:00:1a.7: setting latency timer to 64
> ehci_hcd 0000:00:1a.7: EHCI Host Controller
> ehci_hcd 0000:00:1a.7: new USB bus registered, assigned bus number 1
> ehci_hcd 0000:00:1a.7: debug port 1
> ehci_hcd 0000:00:1a.7: cache line size of 32 is not supported
> ehci_hcd 0000:00:1a.7: irq 22, io mem 0xfebda000
> ehci_hcd 0000:00:1a.7: USB 2.0 started, EHCI 1.00
> usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
> usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
> usb usb1: Product: EHCI Host Controller
> usb usb1: Manufacturer: Linux 2.6.31.6-pvops-dom0 ehci_hcd
> usb usb1: SerialNumber: 0000:00:1a.7
> usb usb1: configuration #1 chosen from 1 choice
> hub 1-0:1.0: USB hub found
> hub 1-0:1.0: 6 ports detected
> work_for_cpu used greatest stack depth: 3888 bytes left
>   alloc irq_desc for 23 on node 0
>   alloc kstat_irqs on node 0
> ehci_hcd 0000:00:1d.7: PCI INT A -> GSI 23 (level, low) -> IRQ 23
> ehci_hcd 0000:00:1d.7: setting latency timer to 64
> ehci_hcd 0000:00:1d.7: EHCI Host Controller
> ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 2
> ehci_hcd 0000:00:1d.7: debug port 1
> ehci_hcd 0000:00:1d.7: cache line size of 32 is not supported
> ehci_hcd 0000:00:1d.7: irq 23, io mem 0xff980000
> ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00
> usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
> usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
> usb usb2: Product: EHCI Host Controller
> usb usb2: Manufacturer: Linux 2.6.31.6-pvops-dom0 ehci_hcd
> usb usb2: SerialNumber: 0000:00:1d.7
> usb usb2: configuration #1 chosen from 1 choice
> hub 2-0:1.0: USB hub found
> hub 2-0:1.0: 6 ports detected
> ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver

So what happend to 0000:00:1a.0 and 0000:00:1a.1? In the Xen boot
those devices were the ones that failed:

uhci_hcd 0000:00:1a.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
uhci_hcd 0000:00:1a.0: UHCI Host Controller
uhci_hcd 0000:00:1a.0: new USB bus registered, assigned bus number 3
uhci_hcd 0000:00:1a.0: irq 16, io base 0x0000ff20
uhci_hcd 0000:00:1a.0: host system error, PCI problems?
uhci_hcd 0000:00:1a.0: host controller halted, very bad!
uhci_hcd 0000:00:1a.0: HC died; cleaning up
uhci_hcd 0000:00:1a.0: USB bus 3 deregistered
uhci_hcd 0000:00:1a.0: PCI INT A disabled
uhci_hcd 0000:00:1a.0: init 0000:00:1a.0 fail, -108
uhci_hcd: probe of 0000:00:1a.0 failed with error -108

But they don't show up in your bootup here? So did somethinh change? Did
they get initialized later?

Can you provide the 'lspci -vvvv' from your bare-metal? Wonder what the
1a.0 and 1a.1 show as.