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From: Mark Rutland <mark.rutland@arm.com>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: "Rafael J . Wysocki" <rjw@rjwysocki.net>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
	linux-pm@vger.kernel.org, Kevin Hilman <khilman@kernel.org>,
	Lina Iyer <ilina@codeaurora.org>,
	Lina Iyer <lina.iyer@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Stephen Boyd <sboyd@kernel.org>, Juri Lelli <juri.lelli@arm.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	linux-arm-kernel@lists.infradead.org,
	linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 00/25] PM / Domains: Support hierarchical CPU arrangement (PSCI/ARM)
Date: Wed, 14 Mar 2018 17:19:15 +0000	[thread overview]
Message-ID: <20180314171914.tdwtppsvjsgxiqlv@lakrids.cambridge.arm.com> (raw)
In-Reply-To: <1521046715-30683-1-git-send-email-ulf.hansson@linaro.org>

Hi Ulf,

On Wed, Mar 14, 2018 at 05:58:10PM +0100, Ulf Hansson wrote:
> For ARM, the PSCI firmware interface may be managing the power to the CPUs.
> Depending on the SoC, CPUs may also be arranged in hierarchical manner, which
> could add another level of complexity from a CPU idle management point of view.
> 
> PSCI v1.0+ adds support for the so called OS initiated CPU suspend mode, which
> enables a more fine grained method, allowing Linux to get more control, in
> regards to being energy efficient. This is typically useful for these kind of
> complex battery driven platforms.

> The series is based on v4.16-rc5, but applies also as of today to Rafael's
> linux-pm.git next branch. The code has been tested on a QCOM 410c dragonboard
> and I except that test coverage should be increased by some more boards
> shortly (for ARM64 with PSCI OSI support - only a few DT changes are needed).

Do we have any numbers to show how this affects energy efficiency?

Are there any other platforms with OSI support?

Thanks,
Mark.

  parent reply	other threads:[~2018-03-14 17:19 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-14 16:58 [PATCH v6 00/25] PM / Domains: Support hierarchical CPU arrangement (PSCI/ARM) Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 01/25] PM / Domains: Don't treat zero found compatible idle states as an error Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 02/25] PM / Domains: Deal with multiple states but no governor in genpd Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 03/25] PM / Domains: Add generic data pointer to genpd_power_state struct Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 04/25] PM / Domains: Add support for CPU devices to genpd Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 05/25] PM / Domains: Add helper functions to attach/detach CPUs to/from genpd Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 06/25] timer: Export next wakeup time of a CPU Ulf Hansson
2018-03-14 17:19   ` Mark Rutland
2018-03-14 16:58 ` [PATCH v6 07/25] PM / Domains: Add genpd governor for CPUs Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 08/25] PM / Domains: Extend genpd CPU governor to cope with QoS constraints Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 09/25] kernel/cpu_pm: Manage runtime PM in the idle path for CPUs Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 10/25] dt: psci: Update DT bindings to support hierarchical PSCI states Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 11/25] of: base: Add of_get_cpu_state_node() to get idle states for a CPU node Ulf Hansson
2018-03-18 12:51   ` Rob Herring
2018-03-14 16:58 ` [PATCH v6 12/25] cpuidle: dt: Support hierarchical CPU idle states Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 13/25] drivers: firmware: psci: Split psci_dt_cpu_init_idle() Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 14/25] drivers: firmware: psci: Support hierarchical CPU idle states Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 15/25] drivers: firmware: psci: Simplify error path of psci_dt_init() Ulf Hansson
2018-03-14 17:25   ` Mark Rutland
2018-03-14 16:58 ` [PATCH v6 16/25] drivers: firmware: psci: Announce support for OS initiated suspend mode Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 17/25] drivers: firmware: psci: Prepare to use " Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 18/25] drivers: firmware: psci: Share a few internal PSCI functions Ulf Hansson
2018-03-14 17:30   ` Mark Rutland
2018-03-14 16:58 ` [PATCH v6 19/25] drivers: firmware: psci: Add support for PM domains using genpd Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 20/25] drivers: firmware: psci: Introduce psci_dt_topology_init() Ulf Hansson
2018-03-14 17:38   ` Mark Rutland
2018-04-10  7:19     ` Ulf Hansson
2018-04-10 11:10       ` Mark Rutland
2018-04-10 12:25         ` Ulf Hansson
2018-04-18 11:32           ` Mark Rutland
2018-03-14 16:58 ` [PATCH v6 21/25] drivers: firmware: psci: Try to attach CPU devices to their PM domains Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 22/25] drivers: firmware: psci: Deal with CPU hotplug when using OSI mode Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 23/25] MAINTAINERS: Update files for PSCI Ulf Hansson
2018-03-14 17:40   ` Mark Rutland
2018-03-14 16:58 ` [PATCH v6 24/25] arm64: kernel: Respect the hierarchical CPU topology in DT " Ulf Hansson
2018-03-14 16:58 ` [PATCH v6 25/25] arm64: dts: Convert to the hierarchical CPU topology layout for MSM8916 Ulf Hansson
2018-03-14 17:19 ` Mark Rutland [this message]
2018-03-15 14:19   ` [PATCH v6 00/25] PM / Domains: Support hierarchical CPU arrangement (PSCI/ARM) Ulf Hansson
2018-03-15 11:00 ` Geert Uytterhoeven
2018-03-15 13:14   ` Ulf Hansson

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