Subject: Re: [RFC PATCH 2/2] powerpc/powernv: implement NMI IPIs with OPAL_SIGNAL_SYSTEM_RESET

From: Benjamin Herrenschmidt <[email-masked]>
Date: Thu, 14 Sep 2017 12:24:49 +1000

On Wed, 2017-09-13 at 23:13 +1000, Nicholas Piggin wrote:
> On Wed, 13 Sep 2017 02:05:53 +1000
> Nicholas Piggin <[email-masked]> wrote:
> 
> > There are two complications. The first is that sreset from stop states
> > come in with SRR1 set to do a powersave wakeup, with an sreset reason
> > encoded.
> > 
> > The second is that threads on the same core can't be signalled directly
> > so we must designate a bounce CPU to reflect the IPI back.
> 
> Here is an updated Linux patch for the latest OPAL patch. This has
> a few assorted fixes as well to make it work nicely, I roll them into
> one patch here to make it easy to apply for testing the OPAL patch.

Why can't you sreset threads of the same core on P9 ?

Cheers,
Ben.