> Under some circumstances I can work out which sources have triggered which
> interrupts (there are various off-CPU FPGAs which implement auxiliary PICs that
> do announce their sources), but the aux-PIC channels are grouped together upon
> delivery to the CPU PIC, so some of the ACK'ing has to be done at the group
> level.
>
> > how is this not possible via genirq?
>
> How is it possible with genirq?
Well, genirq gives you more flexibility than the current mecanism so ...
If I understand correctly, you need to do scray stuff to figure out your
toplevel irq, which shound't be a problem with either mecanisms...
Now, if you have funky cascades, then you can always group them into a
virtual irq cascade line and have a special chained flow handler that
does all the "figuring out" off those... it's up to you.
In general, I found genirq allowed me to do more fancy stuff, and end up
with actually less hooks and indirect function calls on the path to a
given irq than before as you can use tailored flow handlers that do just
the right thing.
Ben.
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