Re: [PATCH] thermal/drivers/netlink: Add the temperature when crossing a trip point

["Rafael J. Wysocki" <rafael@kernel.org>]

On Thu, Mar 25, 2021 at 8:38 PM Daniel Lezcano
<daniel.lezcano@linaro.org> wrote:
>
> The slope of the temperature increase or decrease can be high and when
> the temperature crosses the trip point, there could be a significant
> difference between the trip temperature and the measured temperatures.
>
> That forces the userspace to read the temperature back right after
> receiving a trip violation notification.
>
> In order to be efficient, give the temperature which resulted in the
> trip violation.
>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Srinivas, what do you think?

> ---
>  drivers/thermal/thermal_core.c    |  6 ++++--
>  drivers/thermal/thermal_netlink.c | 11 ++++++-----
>  drivers/thermal/thermal_netlink.h |  8 ++++----
>  include/uapi/linux/thermal.h      |  2 +-
>  4 files changed, 15 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index 996c038f83a4..948020ef51b1 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -430,10 +430,12 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
>         if (tz->last_temperature != THERMAL_TEMP_INVALID) {
>                 if (tz->last_temperature < trip_temp &&
>                     tz->temperature >= trip_temp)
> -                       thermal_notify_tz_trip_up(tz->id, trip);
> +                       thermal_notify_tz_trip_up(tz->id, trip,
> +                                                 tz->temperature);
>                 if (tz->last_temperature >= trip_temp &&
>                     tz->temperature < (trip_temp - hyst))
> -                       thermal_notify_tz_trip_down(tz->id, trip);
> +                       thermal_notify_tz_trip_down(tz->id, trip,
> +                                                   tz->temperature);
>         }
>
>         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
> diff --git a/drivers/thermal/thermal_netlink.c b/drivers/thermal/thermal_netlink.c
> index 1234dbe95895..a16dd4d5d710 100644
> --- a/drivers/thermal/thermal_netlink.c
> +++ b/drivers/thermal/thermal_netlink.c
> @@ -121,7 +121,8 @@ static int thermal_genl_event_tz(struct param *p)
>  static int thermal_genl_event_tz_trip_up(struct param *p)
>  {
>         if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id) ||
> -           nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_ID, p->trip_id))
> +           nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_ID, p->trip_id) ||
> +           nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TEMP, p->temp))
>                 return -EMSGSIZE;
>
>         return 0;
> @@ -285,16 +286,16 @@ int thermal_notify_tz_disable(int tz_id)
>         return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_DISABLE, &p);
>  }
>
> -int thermal_notify_tz_trip_down(int tz_id, int trip_id)
> +int thermal_notify_tz_trip_down(int tz_id, int trip_id, int temp)
>  {
> -       struct param p = { .tz_id = tz_id, .trip_id = trip_id };
> +       struct param p = { .tz_id = tz_id, .trip_id = trip_id, .temp = temp };
>
>         return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_TRIP_DOWN, &p);
>  }
>
> -int thermal_notify_tz_trip_up(int tz_id, int trip_id)
> +int thermal_notify_tz_trip_up(int tz_id, int trip_id, int temp)
>  {
> -       struct param p = { .tz_id = tz_id, .trip_id = trip_id };
> +       struct param p = { .tz_id = tz_id, .trip_id = trip_id, .temp = temp };
>
>         return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_TRIP_UP, &p);
>  }
> diff --git a/drivers/thermal/thermal_netlink.h b/drivers/thermal/thermal_netlink.h
> index 828d1dddfa98..e554f76291f4 100644
> --- a/drivers/thermal/thermal_netlink.h
> +++ b/drivers/thermal/thermal_netlink.h
> @@ -11,8 +11,8 @@ int thermal_notify_tz_create(int tz_id, const char *name);
>  int thermal_notify_tz_delete(int tz_id);
>  int thermal_notify_tz_enable(int tz_id);
>  int thermal_notify_tz_disable(int tz_id);
> -int thermal_notify_tz_trip_down(int tz_id, int id);
> -int thermal_notify_tz_trip_up(int tz_id, int id);
> +int thermal_notify_tz_trip_down(int tz_id, int id, int temp);
> +int thermal_notify_tz_trip_up(int tz_id, int id, int temp);
>  int thermal_notify_tz_trip_delete(int tz_id, int id);
>  int thermal_notify_tz_trip_add(int tz_id, int id, int type,
>                                int temp, int hyst);
> @@ -49,12 +49,12 @@ static inline int thermal_notify_tz_disable(int tz_id)
>         return 0;
>  }
>
> -static inline int thermal_notify_tz_trip_down(int tz_id, int id)
> +static inline int thermal_notify_tz_trip_down(int tz_id, int id, int temp)
>  {
>         return 0;
>  }
>
> -static inline int thermal_notify_tz_trip_up(int tz_id, int id)
> +static inline int thermal_notify_tz_trip_up(int tz_id, int id, int temp)
>  {
>         return 0;
>  }
> diff --git a/include/uapi/linux/thermal.h b/include/uapi/linux/thermal.h
> index c105054cbb57..bf5d9c8ef16f 100644
> --- a/include/uapi/linux/thermal.h
> +++ b/include/uapi/linux/thermal.h
> @@ -18,7 +18,7 @@ enum thermal_trip_type {
>
>  /* Adding event notification support elements */
>  #define THERMAL_GENL_FAMILY_NAME               "thermal"
> -#define THERMAL_GENL_VERSION                   0x01
> +#define THERMAL_GENL_VERSION                   0x02
>  #define THERMAL_GENL_SAMPLING_GROUP_NAME       "sampling"
>  #define THERMAL_GENL_EVENT_GROUP_NAME          "event"
>
> --
> 2.17.1
>