Re: MSI CPU affinity for ARM64

Hello Souradeep,

In what driver do you need to query the CPU affinity? In the GICv3 driver you can read the set of CPUs from isrc->isrc_cpu. In other drivers it appears to be more difficult.

Andrew

> On 7 Jan 2023, at 14:53, Souradeep Chakrabarti <schakrabarti@microsoft.com> wrote:
> 
> Hi,
> I am trying to understand how we can find the target CPU for  MSI in ARM64.
> When looking at gic_v3 code I can see following:
> gic_v3_bind_intr( ) does mapping to next incremental CPU but gic_v3_dist_init( ) does setup boot cpu
> as the target CPU for MSI interrupts.
> 
> If I need to find the CPU bound with a particular MSI interrupt, how we can do that?
> 
> Also is there a way get the the CPU id from the CPU affinity in ARM?
> 
> Thanks & Regards, 
> Souradeep
>