From: Ulf Hansson <ulf.hansson@linaro.org>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Linux PM <linux-pm@vger.kernel.org>,
Stephen Boyd <sboyd@kernel.org>,
linux-arm-msm <linux-arm-msm@vger.kernel.org>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
"Rafael J . Wysocki" <rjw@rjwysocki.net>,
Andy Gross <agross@kernel.org>, Lina Iyer <ilina@codeaurora.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Kevin Hilman <khilman@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Sudeep Holla <sudeep.holla@arm.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v3 08/13] cpuidle: psci: Add a helper to attach a CPU to its PM domain
Date: Thu, 28 Nov 2019 18:21:03 +0100 [thread overview]
Message-ID: <CAPDyKFr1GTAkNyTmLvvC1ovm4yOtMGLOVWA-e-wjGJz2ENdN1g@mail.gmail.com> (raw)
In-Reply-To: <20191128141443.GA31123@e121166-lin.cambridge.arm.com>
On Thu, 28 Nov 2019 at 15:15, Lorenzo Pieralisi
<lorenzo.pieralisi@arm.com> wrote:
>
> On Wed, Nov 27, 2019 at 11:29:09AM +0100, Ulf Hansson wrote:
>
> [...]
>
> > +struct device *psci_dt_attach_cpu(int cpu)
> > +{
> > + struct device *dev;
> > +
> > + /* Currently limit the hierarchical topology to be used in OSI mode. */
> > + if (!psci_has_osi_support())
> > + return NULL;
> > +
> > + dev = dev_pm_domain_attach_by_name(get_cpu_device(cpu), "psci");
> > + if (IS_ERR_OR_NULL(dev))
> > + return dev;
> > +
> > + pm_runtime_irq_safe(dev);
> > + if (cpu_online(cpu))
>
> It is unclear to me how we handle (or rather we don't) CPU hotplug
> with this series - it does not look OK unless genpd code manages
> that automatically.
The series doesn't handle CPU hotplug at the moment, simply because I
am targeting to get the basic support, upstream first.
For a functionality point of view, this isn't a problem in my opinion.
Simply because the consequence is only that the idle states for the
"cluster" will not be reached if there is a CPU brought offline.
As we talked about at LPC and as also told Sudeep for the v2 series,
CPU hotplug is going to be implemented by using a CPU HP notifier.
That should be fine, right?
Kind regards
Uffe
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next prev parent reply other threads:[~2019-11-28 17:21 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-27 10:29 [PATCH v3 00/13] cpuidle: psci: Support hierarchical CPU arrangement Ulf Hansson
2019-11-27 10:29 ` [PATCH v3 01/13] cpuidle: psci: Align psci_power_state count with idle state count Ulf Hansson
2019-11-27 10:29 ` [PATCH v3 02/13] dt: psci: Update DT bindings to support hierarchical PSCI states Ulf Hansson
2019-11-27 10:29 ` [PATCH v3 03/13] firmware: psci: Export functions to manage the OSI mode Ulf Hansson
2019-11-27 10:29 ` [PATCH v3 04/13] of: base: Add of_get_cpu_state_node() to get idle states for a CPU node Ulf Hansson
2019-11-27 10:29 ` [PATCH v3 05/13] cpuidle: dt: Support hierarchical CPU idle states Ulf Hansson
2019-11-27 10:29 ` [PATCH v3 06/13] cpuidle: psci: Simplify OF parsing of CPU idle state nodes Ulf Hansson
2019-11-27 10:29 ` [PATCH v3 07/13] cpuidle: psci: Support hierarchical CPU idle states Ulf Hansson
2019-11-27 10:29 ` [PATCH v3 08/13] cpuidle: psci: Add a helper to attach a CPU to its PM domain Ulf Hansson
2019-11-28 14:14 ` Lorenzo Pieralisi
2019-11-28 17:21 ` Ulf Hansson [this message]
2019-11-28 18:31 ` Lorenzo Pieralisi
2019-11-28 22:04 ` Ulf Hansson
2019-11-27 10:29 ` [PATCH v3 09/13] cpuidle: psci: Attach CPU devices to their PM domains Ulf Hansson
2019-11-27 10:29 ` [PATCH v3 10/13] cpuidle: psci: Prepare to use OS initiated suspend mode via " Ulf Hansson
2019-12-05 18:35 ` Lorenzo Pieralisi
2019-12-05 20:25 ` Ulf Hansson
2019-12-05 20:38 ` Ulf Hansson
2019-12-06 11:25 ` Lorenzo Pieralisi
2019-12-06 14:26 ` Ulf Hansson
2019-12-06 15:14 ` Lorenzo Pieralisi
2019-12-06 17:23 ` Ulf Hansson
2019-11-27 10:29 ` [PATCH v3 11/13] cpuidle: psci: Manage runtime PM in the idle path Ulf Hansson
2019-11-27 10:29 ` [PATCH v3 12/13] cpuidle: psci: Add support for PM domains by using genpd Ulf Hansson
2019-11-27 10:29 ` [PATCH v3 13/13] arm64: dts: Convert to the hierarchical CPU topology layout for MSM8916 Ulf Hansson
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