linux-kernel - Re: [PATCH RFC 1/2] thermal/cpu idle cooling: Introduce cpu idle cooling driver

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Date:   Thu, 8 Jun 2017 09:19:13 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Tao Wang <kevin.wangtao@...ilicon.com>
Cc:     rui.zhang@...el.com, edubezval@...il.com,
        Amit Kachhap <amit.kachhap@...il.com>,
        viresh kumar <viresh.kumar@...aro.org>, javi.merino@...nel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "Sunzhaosheng Sun(Zhaosheng)" <sunzhaosheng@...ilicon.com>,
        Jean Wangtao <jean.wangtao@...aro.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH RFC 1/2] thermal/cpu idle cooling: Introduce cpu idle
 cooling driver

Hi Kevin,

On 5 June 2017 at 11:07, Tao Wang <kevin.wangtao@...ilicon.com> wrote:
> cpu idle cooling driver performs synchronized idle injection across
> all cpu in same cluster, offers a new method to cooling down cpu,
> that is similar to intel_power_clamp driver, but is basically
> designed for ARM platform.
> Each cluster has its own idle cooling device, each core has its own
> idle injection thread, idle injection thread use play_idle to enter
> idle. In order to reach deepest idle state, all cores are aligned by
> jiffies. the injected idle ratio can be controlled through cooling
> device interface.
>
> Signed-off-by: Tao Wang <kevin.wangtao@...ilicon.com>
> ---
>  drivers/thermal/Kconfig            |   13 +
>  drivers/thermal/Makefile           |    3 +
>  drivers/thermal/cpu_idle_cooling.c |  648 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 664 insertions(+)
>  create mode 100644 drivers/thermal/cpu_idle_cooling.c
>
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index b5b5fac..f78e85c 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -154,6 +154,19 @@ config CPU_THERMAL
>
>           If you want this support, you should say Y here.
>
> +config CPU_IDLE_THERMAL
> +       tristate "generic cpu idle cooling support"
> +       depends on CPU_FREQ

Does CPU_IDLE_THERMAL really depend on CPU_FREQ ?
This dependency should be put for CPU_THERMAL_COMBO in the patch 2

> +       help
> +         This implements the generic cpu cooling mechanism through idle
> +         injection.
> +
> +         This will throttle cpu by injecting specified idle time in
> +         a fixed cycle. All cpu in same cluster will enter idle synchronously
> +         to reach deepest idle state when injecting idle.
> +
> +         If you want this support, you should say Y here.
> +
>  config CLOCK_THERMAL
>         bool "Generic clock cooling support"
>         depends on COMMON_CLK
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index 094d703..a4db66e 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -26,6 +26,9 @@ thermal_sys-$(CONFIG_CLOCK_THERMAL)   += clock_cooling.o
>  # devfreq cooling
>  thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o
>
> +# cpu idle cooling
> +obj-$(CONFIG_CPU_IDLE_THERMAL) += cpu_idle_cooling.o
> +
>  # platform thermal drivers
>  obj-y                          += broadcom/
>  obj-$(CONFIG_QCOM_SPMI_TEMP_ALARM)     += qcom-spmi-temp-alarm.o
> diff --git a/drivers/thermal/cpu_idle_cooling.c b/drivers/thermal/cpu_idle_cooling.c
> new file mode 100644
> index 0000000..89a15c5
> --- /dev/null

[snip]