RE: [EXTERNAL] Re: MSI CPU affinity for ARM64

> -----Original Message-----
> From: Andrew Turner <andrew@fubar.geek.nz>
> Sent: Monday, January 9, 2023 5:14 PM
> To: Souradeep Chakrabarti <schakrabarti@microsoft.com>
> Cc: freebsd-arm@FreeBSD.org; Li-Wen Hsu <lwhsu@freebsd.org>; Wei Hu
> <weh@microsoft.com>
> Subject: [EXTERNAL] 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
[Souradeep] 
I am trying to get the CPU id from vmbus_pcib driver.
I need to find for the MSI interrupt, what is the CPUid.
> 
> > 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
> >