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Date:   Fri, 30 Sep 2022 19:31:12 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     rafael@...nel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, rui.zhang@...el.com,
        Raju Rangoju <rajur@...lsio.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Peter Kaestle <peter@...e.net>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Amit Kucheria <amitk@...nel.org>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Broadcom Kernel Team <bcm-kernel-feedback-list@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Support Opensource <support.opensource@...semi.com>,
        Lukasz Luba <lukasz.luba@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Thara Gopinath <thara.gopinath@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Keerthy <j-keerthy@...com>,
        Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Antoine Tenart <atenart@...nel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Dmitry Osipenko <digetx@...il.com>, netdev@...r.kernel.org,
        platform-driver-x86@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-omap@...r.kernel.org
Subject: Re: [PATCH v7 04/29] thermal/core/governors: Use thermal_zone_get_trip()
 instead of ops functions

On Wed, Sep 28, 2022 at 11:01 PM Daniel Lezcano
<daniel.lezcano@...aro.org> wrote:
>
> The governors are using the ops->get_trip_* functions, Replace these
> calls with thermal_zone_get_trip().
>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> Reviewed-by: Zhang Rui <rui.zhang@...el.com>
> Reviewed-by: Lukasz Luba <lukasz.luba@....com> # IPA

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
>  drivers/thermal/gov_bang_bang.c       | 39 +++++++++++---------
>  drivers/thermal/gov_fair_share.c      | 18 ++++------
>  drivers/thermal/gov_power_allocator.c | 51 ++++++++++++---------------
>  drivers/thermal/gov_step_wise.c       | 22 ++++++------
>  4 files changed, 62 insertions(+), 68 deletions(-)
>
> diff --git a/drivers/thermal/gov_bang_bang.c b/drivers/thermal/gov_bang_bang.c
> index a08bbe33be96..af7737ec90c3 100644
> --- a/drivers/thermal/gov_bang_bang.c
> +++ b/drivers/thermal/gov_bang_bang.c
> @@ -13,26 +13,28 @@
>
>  #include "thermal_core.h"
>
> -static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
> +static int thermal_zone_trip_update(struct thermal_zone_device *tz, int trip_id)
>  {
> -       int trip_temp, trip_hyst;
> +       struct thermal_trip trip;
>         struct thermal_instance *instance;
> +       int ret;
>
> -       tz->ops->get_trip_temp(tz, trip, &trip_temp);
> -
> -       if (!tz->ops->get_trip_hyst) {
> -               pr_warn_once("Undefined get_trip_hyst for thermal zone %s - "
> -                               "running with default hysteresis zero\n", tz->type);
> -               trip_hyst = 0;
> -       } else
> -               tz->ops->get_trip_hyst(tz, trip, &trip_hyst);
> +       ret = __thermal_zone_get_trip(tz, trip_id, &trip);
> +       if (ret) {
> +               pr_warn_once("Failed to retrieve trip point %d\n", trip_id);
> +               return ret;
> +       }
> +
> +       if (!trip.hysteresis)
> +               dev_info_once(&tz->device,
> +                             "Zero hysteresis value for thermal zone %s\n", tz->type);
>
>         dev_dbg(&tz->device, "Trip%d[temp=%d]:temp=%d:hyst=%d\n",
> -                               trip, trip_temp, tz->temperature,
> -                               trip_hyst);
> +                               trip_id, trip.temperature, tz->temperature,
> +                               trip.hysteresis);
>
>         list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
> -               if (instance->trip != trip)
> +               if (instance->trip != trip_id)
>                         continue;
>
>                 /* in case fan is in initial state, switch the fan off */
> @@ -50,10 +52,10 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
>                  * enable fan when temperature exceeds trip_temp and disable
>                  * the fan in case it falls below trip_temp minus hysteresis
>                  */
> -               if (instance->target == 0 && tz->temperature >= trip_temp)
> +               if (instance->target == 0 && tz->temperature >= trip.temperature)
>                         instance->target = 1;
>                 else if (instance->target == 1 &&
> -                               tz->temperature <= trip_temp - trip_hyst)
> +                        tz->temperature <= trip.temperature - trip.hysteresis)
>                         instance->target = 0;
>
>                 dev_dbg(&instance->cdev->device, "target=%d\n",
> @@ -63,6 +65,8 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
>                 instance->cdev->updated = false; /* cdev needs update */
>                 mutex_unlock(&instance->cdev->lock);
>         }
> +
> +       return 0;
>  }
>
>  /**
> @@ -95,10 +99,13 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
>  static int bang_bang_control(struct thermal_zone_device *tz, int trip)
>  {
>         struct thermal_instance *instance;
> +       int ret;
>
>         lockdep_assert_held(&tz->lock);
>
> -       thermal_zone_trip_update(tz, trip);
> +       ret = thermal_zone_trip_update(tz, trip);
> +       if (ret)
> +               return ret;
>
>         list_for_each_entry(instance, &tz->thermal_instances, tz_node)
>                 thermal_cdev_update(instance->cdev);
> diff --git a/drivers/thermal/gov_fair_share.c b/drivers/thermal/gov_fair_share.c
> index a4ee4661e9cc..bca60cd21655 100644
> --- a/drivers/thermal/gov_fair_share.c
> +++ b/drivers/thermal/gov_fair_share.c
> @@ -21,16 +21,12 @@
>   */
>  static int get_trip_level(struct thermal_zone_device *tz)
>  {
> -       int count = 0;
> -       int trip_temp;
> -       enum thermal_trip_type trip_type;
> -
> -       if (tz->num_trips == 0 || !tz->ops->get_trip_temp)
> -               return 0;
> +       struct thermal_trip trip;
> +       int count;
>
>         for (count = 0; count < tz->num_trips; count++) {
> -               tz->ops->get_trip_temp(tz, count, &trip_temp);
> -               if (tz->temperature < trip_temp)
> +               __thermal_zone_get_trip(tz, count, &trip);
> +               if (tz->temperature < trip.temperature)
>                         break;
>         }
>
> @@ -38,10 +34,8 @@ static int get_trip_level(struct thermal_zone_device *tz)
>          * count > 0 only if temperature is greater than first trip
>          * point, in which case, trip_point = count - 1
>          */
> -       if (count > 0) {
> -               tz->ops->get_trip_type(tz, count - 1, &trip_type);
> -               trace_thermal_zone_trip(tz, count - 1, trip_type);
> -       }
> +       if (count > 0)
> +               trace_thermal_zone_trip(tz, count - 1, trip.type);
>
>         return count;
>  }
> diff --git a/drivers/thermal/gov_power_allocator.c b/drivers/thermal/gov_power_allocator.c
> index 2d1aeaba38a8..eafb28839281 100644
> --- a/drivers/thermal/gov_power_allocator.c
> +++ b/drivers/thermal/gov_power_allocator.c
> @@ -125,16 +125,15 @@ static void estimate_pid_constants(struct thermal_zone_device *tz,
>                                    u32 sustainable_power, int trip_switch_on,
>                                    int control_temp)
>  {
> +       struct thermal_trip trip;
> +       u32 temperature_threshold = control_temp;
>         int ret;
> -       int switch_on_temp;
> -       u32 temperature_threshold;
>         s32 k_i;
>
> -       ret = tz->ops->get_trip_temp(tz, trip_switch_on, &switch_on_temp);
> -       if (ret)
> -               switch_on_temp = 0;
> +       ret = __thermal_zone_get_trip(tz, trip_switch_on, &trip);
> +       if (!ret)
> +               temperature_threshold -= trip.temperature;
>
> -       temperature_threshold = control_temp - switch_on_temp;
>         /*
>          * estimate_pid_constants() tries to find appropriate default
>          * values for thermal zones that don't provide them. If a
> @@ -520,10 +519,10 @@ static void get_governor_trips(struct thermal_zone_device *tz,
>         last_passive = INVALID_TRIP;
>
>         for (i = 0; i < tz->num_trips; i++) {
> -               enum thermal_trip_type type;
> +               struct thermal_trip trip;
>                 int ret;
>
> -               ret = tz->ops->get_trip_type(tz, i, &type);
> +               ret = __thermal_zone_get_trip(tz, i, &trip);
>                 if (ret) {
>                         dev_warn(&tz->device,
>                                  "Failed to get trip point %d type: %d\n", i,
> @@ -531,14 +530,14 @@ static void get_governor_trips(struct thermal_zone_device *tz,
>                         continue;
>                 }
>
> -               if (type == THERMAL_TRIP_PASSIVE) {
> +               if (trip.type == THERMAL_TRIP_PASSIVE) {
>                         if (!found_first_passive) {
>                                 params->trip_switch_on = i;
>                                 found_first_passive = true;
>                         } else  {
>                                 last_passive = i;
>                         }
> -               } else if (type == THERMAL_TRIP_ACTIVE) {
> +               } else if (trip.type == THERMAL_TRIP_ACTIVE) {
>                         last_active = i;
>                 } else {
>                         break;
> @@ -633,7 +632,7 @@ static int power_allocator_bind(struct thermal_zone_device *tz)
>  {
>         int ret;
>         struct power_allocator_params *params;
> -       int control_temp;
> +       struct thermal_trip trip;
>
>         ret = check_power_actors(tz);
>         if (ret)
> @@ -659,13 +658,12 @@ static int power_allocator_bind(struct thermal_zone_device *tz)
>         get_governor_trips(tz, params);
>
>         if (tz->num_trips > 0) {
> -               ret = tz->ops->get_trip_temp(tz,
> -                                       params->trip_max_desired_temperature,
> -                                       &control_temp);
> +               ret = __thermal_zone_get_trip(tz, params->trip_max_desired_temperature,
> +                                             &trip);
>                 if (!ret)
>                         estimate_pid_constants(tz, tz->tzp->sustainable_power,
>                                                params->trip_switch_on,
> -                                              control_temp);
> +                                              trip.temperature);
>         }
>
>         reset_pid_controller(params);
> @@ -695,11 +693,11 @@ static void power_allocator_unbind(struct thermal_zone_device *tz)
>         tz->governor_data = NULL;
>  }
>
> -static int power_allocator_throttle(struct thermal_zone_device *tz, int trip)
> +static int power_allocator_throttle(struct thermal_zone_device *tz, int trip_id)
>  {
> -       int ret;
> -       int switch_on_temp, control_temp;
>         struct power_allocator_params *params = tz->governor_data;
> +       struct thermal_trip trip;
> +       int ret;
>         bool update;
>
>         lockdep_assert_held(&tz->lock);
> @@ -708,13 +706,12 @@ static int power_allocator_throttle(struct thermal_zone_device *tz, int trip)
>          * We get called for every trip point but we only need to do
>          * our calculations once
>          */
> -       if (trip != params->trip_max_desired_temperature)
> +       if (trip_id != params->trip_max_desired_temperature)
>                 return 0;
>
> -       ret = tz->ops->get_trip_temp(tz, params->trip_switch_on,
> -                                    &switch_on_temp);
> -       if (!ret && (tz->temperature < switch_on_temp)) {
> -               update = (tz->last_temperature >= switch_on_temp);
> +       ret = __thermal_zone_get_trip(tz, params->trip_switch_on, &trip);
> +       if (!ret && (tz->temperature < trip.temperature)) {
> +               update = (tz->last_temperature >= trip.temperature);
>                 tz->passive = 0;
>                 reset_pid_controller(params);
>                 allow_maximum_power(tz, update);
> @@ -723,16 +720,14 @@ static int power_allocator_throttle(struct thermal_zone_device *tz, int trip)
>
>         tz->passive = 1;
>
> -       ret = tz->ops->get_trip_temp(tz, params->trip_max_desired_temperature,
> -                               &control_temp);
> +       ret = __thermal_zone_get_trip(tz, params->trip_max_desired_temperature, &trip);
>         if (ret) {
> -               dev_warn(&tz->device,
> -                        "Failed to get the maximum desired temperature: %d\n",
> +               dev_warn(&tz->device, "Failed to get the maximum desired temperature: %d\n",
>                          ret);
>                 return ret;
>         }
>
> -       return allocate_power(tz, control_temp);
> +       return allocate_power(tz, trip.temperature);
>  }
>
>  static struct thermal_governor thermal_gov_power_allocator = {
> diff --git a/drivers/thermal/gov_step_wise.c b/drivers/thermal/gov_step_wise.c
> index cdd3354bc27f..31235e169c5a 100644
> --- a/drivers/thermal/gov_step_wise.c
> +++ b/drivers/thermal/gov_step_wise.c
> @@ -95,30 +95,28 @@ static void update_passive_instance(struct thermal_zone_device *tz,
>                 tz->passive += value;
>  }
>
> -static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
> +static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip_id)
>  {
> -       int trip_temp;
> -       enum thermal_trip_type trip_type;
>         enum thermal_trend trend;
>         struct thermal_instance *instance;
> +       struct thermal_trip trip;
>         bool throttle = false;
>         int old_target;
>
> -       tz->ops->get_trip_temp(tz, trip, &trip_temp);
> -       tz->ops->get_trip_type(tz, trip, &trip_type);
> +       __thermal_zone_get_trip(tz, trip_id, &trip);
>
> -       trend = get_tz_trend(tz, trip);
> +       trend = get_tz_trend(tz, trip_id);
>
> -       if (tz->temperature >= trip_temp) {
> +       if (tz->temperature >= trip.temperature) {
>                 throttle = true;
> -               trace_thermal_zone_trip(tz, trip, trip_type);
> +               trace_thermal_zone_trip(tz, trip_id, trip.type);
>         }
>
>         dev_dbg(&tz->device, "Trip%d[type=%d,temp=%d]:trend=%d,throttle=%d\n",
> -                               trip, trip_type, trip_temp, trend, throttle);
> +                               trip_id, trip.type, trip.temperature, trend, throttle);
>
>         list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
> -               if (instance->trip != trip)
> +               if (instance->trip != trip_id)
>                         continue;
>
>                 old_target = instance->target;
> @@ -132,11 +130,11 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
>                 /* Activate a passive thermal instance */
>                 if (old_target == THERMAL_NO_TARGET &&
>                         instance->target != THERMAL_NO_TARGET)
> -                       update_passive_instance(tz, trip_type, 1);
> +                       update_passive_instance(tz, trip.type, 1);
>                 /* Deactivate a passive thermal instance */
>                 else if (old_target != THERMAL_NO_TARGET &&
>                         instance->target == THERMAL_NO_TARGET)
> -                       update_passive_instance(tz, trip_type, -1);
> +                       update_passive_instance(tz, trip.type, -1);
>
>                 instance->initialized = true;
>                 mutex_lock(&instance->cdev->lock);
> --
> 2.34.1
>

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