From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <ian.campbell@citrix.com>
Subject: Re: [PATCH v7 18/28] xen/arm: ITS: Export ITS info to
 Virtual ITS
Date: Thu, 24 Sep 2015 09:27:45 +0100
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To: Vijay Kilari <vijay.kilari@gmail.com>, Julien Grall <julien.grall@citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Prasun Kapoor <Prasun.Kapoor@caviumnetworks.com>, Vijaya Kumar K <Vijaya.Kumar@caviumnetworks.com>, Tim Deegan <tim@xen.org>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>, Stefano Stabellini <stefano.stabellini@citrix.com>, manish.jaggi@caviumnetworks.com
List-Id: xen-devel@lists.xenproject.org

On Thu, 2015-09-24 at 10:56 +0530, Vijay Kilari wrote:

> > > +
> > >          plpi = its_get_plpi(pdev, i);
> > >          /* TODO: Route lpi */
> > >      }
> > > @@ -1366,6 +1374,8 @@ static int its_probe(struct dt_device_node
> > > *node)
> > >      its->phys_size = its_size;
> > >      typer = readl_relaxed(its_base + GITS_TYPER);
> > >      its->ite_size = ((typer >> 4) & 0xf) + 1;
> > > +    its_data.eventID_bits = GITS_TYPER_IDBITS(typer);
> > > +    its_data.devID_bits = GITS_TYPER_DEVBITS(typer);
> > 
> > The 2 fields will be override every time a new ITS node will be
> > initialized.
> > 
> > What ensure that all the ITS have the same number of Event ID and
> > Device ID?
> 
> Nothing of I thing of ensures this at HW level.

The question here is about the behaviour of the software emulation.

>  Either we should
> assume that all the ITS
> have number of Event and Device ID or we choose lower of all the ITS?.

Don't we need, if anything, the highest?