linux-kernel - Re: [PATCH v3 1/4] thermal: core: Add helpers to browse the cdev, tz and governor list

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Message-ID: <CAHLCerMu8YQZvt91qWKWBnWKZwFp=Ch-HpBK2-+Ut8nsM1S7ww@mail.gmail.com>
Date:   Fri, 3 Jul 2020 14:44:37 +0530
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Ram Chandrasekar <rkumbako@...eaurora.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v3 1/4] thermal: core: Add helpers to browse the cdev, tz
 and governor list

On Fri, Jul 3, 2020 at 2:23 PM Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>
> The cdev, tz and governor list, as well as their respective locks are
> statically defined in the thermal_core.c file.
>
> In order to give a sane access to these list, like browsing all the
> thermal zones or all the cooling devices, let's define a set of
> helpers where we pass a callback as a parameter to be called for each
> thermal entity.
>
> We keep the self-encapsulation and ensure the locks are correctly
> taken when looking at the list.
>
> Acked-by: Zhang Rui <rui.zhang@...el.com>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>

Reviewed-by: Amit Kucheria <amit.kucheria@...aro.org>

> ---
>  drivers/thermal/thermal_core.c | 51 ++++++++++++++++++++++++++++++++++
>  drivers/thermal/thermal_core.h |  9 ++++++
>  2 files changed, 60 insertions(+)
>
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index b71196eaf90e..9caaa0b6d662 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -617,6 +617,57 @@ void thermal_zone_device_rebind_exception(struct thermal_zone_device *tz,
>         mutex_unlock(&thermal_list_lock);
>  }
>
> +int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
> +                             void *data)
> +{
> +       struct thermal_governor *gov;
> +       int ret = 0;
> +
> +       mutex_lock(&thermal_governor_lock);
> +       list_for_each_entry(gov, &thermal_governor_list, governor_list) {
> +               ret = cb(gov, data);
> +               if (ret)
> +                       break;
> +       }
> +       mutex_unlock(&thermal_governor_lock);
> +
> +       return ret;
> +}
> +
> +int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
> +                                             void *), void *data)
> +{
> +       struct thermal_cooling_device *cdev;
> +       int ret = 0;
> +
> +       mutex_lock(&thermal_list_lock);
> +       list_for_each_entry(cdev, &thermal_cdev_list, node) {
> +               ret = cb(cdev, data);
> +               if (ret)
> +                       break;
> +       }
> +       mutex_unlock(&thermal_list_lock);
> +
> +       return ret;
> +}
> +
> +int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *),
> +                         void *data)
> +{
> +       struct thermal_zone_device *tz;
> +       int ret = 0;
> +
> +       mutex_lock(&thermal_list_lock);
> +       list_for_each_entry(tz, &thermal_tz_list, node) {
> +               ret = cb(tz, data);
> +               if (ret)
> +                       break;
> +       }
> +       mutex_unlock(&thermal_list_lock);
> +
> +       return ret;
> +}
> +
>  void thermal_zone_device_unbind_exception(struct thermal_zone_device *tz,
>                                           const char *cdev_type, size_t size)
>  {
> diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h
> index c95689586e19..71d88dac0791 100644
> --- a/drivers/thermal/thermal_core.h
> +++ b/drivers/thermal/thermal_core.h
> @@ -41,6 +41,15 @@ extern struct thermal_governor *__governor_thermal_table_end[];
>              __governor < __governor_thermal_table_end; \
>              __governor++)
>
> +int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *),
> +                         void *);
> +
> +int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
> +                                             void *), void *);
> +
> +int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
> +                             void *thermal_governor);
> +
>  struct thermal_attr {
>         struct device_attribute attr;
>         char name[THERMAL_NAME_LENGTH];
> --
> 2.17.1
>