linux-kernel - Re: [PATCH 0/6] pmdomain/cpuidle-psci: Support s2idle/s2ram on PREEMPT

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Date: Tue, 30 Apr 2024 11:44:11 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: "Rafael J . Wysocki" <rafael@...nel.org>,
	Sudeep Holla <sudeep.holla@....com>, linux-pm@...r.kernel.org,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Nikunj Kela <nkela@...cinc.com>,
	Prasad Sodagudi <psodagud@...cinc.com>,
	Maulik Shah <quic_mkshah@...cinc.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	linux-rt-users@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] pmdomain/cpuidle-psci: Support s2idle/s2ram on
 PREEMPT_RT

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?

> Kind regards
> Ulf Hansson

Sebastian