[PATCH 0/6] pmdomain/cpuidle-psci: Support s2idle/s2ram on PREEMPT_RT

[Ulf Hansson]

On Tue, 30 Apr 2024 at 11:44, Sebastian Andrzej Siewior
<bigeasy at linutronix.de> wrote:
>
> On 2024-04-29 16:05:25 [+0200], Ulf Hansson wrote:
> > The hierarchical PM domain topology and the corresponding domain-idle-states
> > are currently disabled on a PREEMPT_RT based configuration. The main reason is
> > because spinlocks are turned into sleepable locks on PREEMPT_RT, which means
> > genpd and runtime PM can't be use in the atomic idle-path when
> > selecting/entering an idle-state.
> >
> > For s2idle/s2ram this is an unnecessary limitation that this series intends to
> > address. Note that, the support for cpuhotplug is left to future improvements.
> > More information about this are available in the commit messages.
> >
> > I have tested this on a Dragonboard 410c.
>
> Have you tested this with PREEMPT_RT enabled and if so, which kernel?

Yes, of course. :-) I should have mentioned this in the cover-letter, sorry.

I have used the linux-rt-devel.git, which had a branch based upon
v6.8-rc7 a while ago, that I used when I did my tests.

The series needed a small rebase on top of my linux-pm tree [1],
before I could post it though. I also tested the rebased series, but
then of course then not with PREEMPT_RT, but to make sure there are no
regressions.

Kind regards
Uffe

[1]
https://git.kernel.org/pub/scm/linux/kernel/git/ulfh/linux-pm.git next