On Tue, Dec 19, 2017 at 11:42:41PM +0800, Zhang Rui wrote: > On Tue, 2017-12-19 at 16:23 +0100, Peter Zijlstra wrote:
> > [ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl) > > [ 0.000000] ACPI: IRQ0 used by override. > > > > So your ACPI table has an override for IRQ2 and routes it to IRQ0. ^ this > > The HPET document says: > > > > If the ENABLE_CNF bit and the LEG_RT_CNF bit are both set, then the > > interrupts will be routed as follows: > > > > Timer 0 will be routed to IRQ0 in Non-APIC or IRQ2 in the I/O APIC > > But AFAICS, the HPET emulated timer interrupts goes to IRQ0 Right, so see that ACPI override, that routes I/O APIC IRQ2 to IRQ0, or it _should_. Clearly something is messed up here.. but I've no idea what. That whole IRQ routing stuff is confusing.
