Re: [Xen-devel] Re: "ACPI: Unable to start the ACPI Interpreter"

[Liwei <xieliwei@xxxxxxxxx>]

On 28 June 2011 03:10, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:
>
> Another glance shows:
>
> (2.6.32):
> [    3.502771] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
> [    3.502773] xen: sci override: source_irq=9 global_irq=20 trigger=c 
> polarity=3
> [    3.502775] xen: registering gsi 20 triggering 0 polarity 1
> [    3.502780]   alloc irq_desc for 20 on node 0
>
> So it has IRQ 9 mapped to IRQ 20 while in 3.0:
>
> [    3.803695] xen: --> pirq=7 -> irq=7
> [    3.803699] xen: --> pirq=8 -> irq=8
> [    3.803702] xen: --> pirq=10 -> irq=10
>
> we skip over IRQ 9. We should have gotten something like this:
>
> [    7.059735] xen_map_pirq_gsi: returning irq 20 for gsi 9
> [    7.064933] xen: --> pirq=20 -> irq=9
>
> But we did not. If you can instrument 'acpi_get_override_irq' to see
> at which of the numerous 'return -1' it fails  that might narrow down
> the issue.
>

Erm, do you want me to set up some kernel tracing or just add a printk
to acpi_get_override_irq? My kernel hacking foo is very limited.

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