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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Jun 28, 2011 at 03:18:21AM +0800, Liwei wrote:
> 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.

Just splash some printk's around there and print out the values of gsi and pins.
Nothing fancy.

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