Messages in this thread | | | Subject | Re: Affinity for GIC irq line | From | Marc Zyngier <> | Date | Wed, 25 Apr 2018 08:07:31 +0100 |
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On 25/04/18 04:23, valmiki wrote: > Hi all, > > When an IRQ line is set affinity using irq_set_affinity, which calls > irq_do_set_affinity, this API copies affinity mask to affinity variable > in irq_common_data of this irq descriptor.
It does a wee bit more. Crucially, it contains the line:
ret = chip->irq_set_affinity(data, mask, force);
> But as per ARM GICv2 document in order to drive a interrupt to a > specific CPU we need to program GICD_ITARGETSRn register. > > But irq_set_affinity isn't writing to this register.Please correct me if > I'm wrong i did not find code for this register being updated in > irq_set_affinity flow. > So how affinity is being set for an IRQ line ?
I would have though that a function name such as "gic_set_affinity" was clear enough?
> If affinity was set successfully on what CPU does asm_do_IRQ run ?
It runs on the CPU that the interrupt targets, I'd say.
M. -- Jazz is not dead. It just smells funny...
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