Query on handling some special Group0 interrupt in Linux
Mukesh Ojha
quic_mojha at quicinc.com
Wed Nov 9 08:20:35 PST 2022
Hi,
I was working on a use case where both el2/el3 are implemented and we
have a watchdog interrupt (SPI), which is used for detecting software
hangs and cause device reset; If that interrupt's current cpu affinity
is on a core, where interrupts are disabled, we won't be able to serve
it or if this interrupt comes on a core which has interrupt enabled,
calling panic() or with smp_send_stop(), we would not be able
to know the call stack of the other cores which is running with
interrupt disabled.
I was thinking of configuring both a watchdog irq(SPI) and IPI_STOP
(SGI) or any reserve IPI as an FIQ. And from the watchdog irq handler,
I was thinking of calling panic() which eventually sends IPI_STOP(SGI
FIQ) to all the cores. And with this we will able to dump all the core
call stack.
I am able to achieve this but wanted to know if this is acceptable to
the community to support/allow such use cases like above and enable
group0 interrupt from GIC for some special use cases.
-Mukesh
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