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Date: Wed, 29 Mar 2023 20:39:20 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Zhang Rui <rui.zhang@...el.com>
Cc: linux-pm@...r.kernel.org, rafael.j.wysocki@...el.com,
daniel.lezcano@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] thermal/core: Remove thermal_bind_params structure
On Fri, Mar 24, 2023 at 8:08 AM Zhang Rui <rui.zhang@...el.com> wrote:
>
> Remove struct thermal_bind_params because no one is using it for thermal
> binding now.
>
> Signed-off-by: Zhang Rui <rui.zhang@...el.com>
I think that this patch is useful by itself. Does it depend on the
rest of the series?
> ---
> .../driver-api/thermal/sysfs-api.rst | 40 ------
> drivers/thermal/thermal_core.c | 134 ++----------------
> include/linux/thermal.h | 38 -----
> 3 files changed, 14 insertions(+), 198 deletions(-)
>
> diff --git a/Documentation/driver-api/thermal/sysfs-api.rst b/Documentation/driver-api/thermal/sysfs-api.rst
> index 2e0f79a9e2ee..6c1175c6afba 100644
> --- a/Documentation/driver-api/thermal/sysfs-api.rst
> +++ b/Documentation/driver-api/thermal/sysfs-api.rst
> @@ -304,42 +304,6 @@ temperature) and throttle appropriate devices.
> 1.4 Thermal Zone Parameters
> ---------------------------
>
> - ::
> -
> - struct thermal_bind_params
> -
> - This structure defines the following parameters that are used to bind
> - a zone with a cooling device for a particular trip point.
> -
> - .cdev:
> - The cooling device pointer
> - .weight:
> - The 'influence' of a particular cooling device on this
> - zone. This is relative to the rest of the cooling
> - devices. For example, if all cooling devices have a
> - weight of 1, then they all contribute the same. You can
> - use percentages if you want, but it's not mandatory. A
> - weight of 0 means that this cooling device doesn't
> - contribute to the cooling of this zone unless all cooling
> - devices have a weight of 0. If all weights are 0, then
> - they all contribute the same.
> - .trip_mask:
> - This is a bit mask that gives the binding relation between
> - this thermal zone and cdev, for a particular trip point.
> - If nth bit is set, then the cdev and thermal zone are bound
> - for trip point n.
> - .binding_limits:
> - This is an array of cooling state limits. Must have
> - exactly 2 * thermal_zone.number_of_trip_points. It is an
> - array consisting of tuples <lower-state upper-state> of
> - state limits. Each trip will be associated with one state
> - limit tuple when binding. A NULL pointer means
> - <THERMAL_NO_LIMITS THERMAL_NO_LIMITS> on all trips.
> - These limits are used when binding a cdev to a trip point.
> - .match:
> - This call back returns success(0) if the 'tz and cdev' need to
> - be bound, as per platform data.
> -
> ::
>
> struct thermal_zone_params
> @@ -357,10 +321,6 @@ temperature) and throttle appropriate devices.
> will be created. when no_hwmon == true, nothing will be done.
> In case the thermal_zone_params is NULL, the hwmon interface
> will be created (for backward compatibility).
> - .num_tbps:
> - Number of thermal_bind_params entries for this zone
> - .tbp:
> - thermal_bind_params entries
>
> 2. sysfs attributes structure
> =============================
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index fd54e6c10b60..5225d65fb0e0 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -794,65 +794,20 @@ void print_bind_err_msg(struct thermal_zone_device *tz,
> tz->type, cdev->type, ret);
> }
>
> -static void __bind(struct thermal_zone_device *tz, int mask,
> - struct thermal_cooling_device *cdev,
> - unsigned long *limits,
> - unsigned int weight)
> -{
> - int i, ret;
> -
> - for (i = 0; i < tz->num_trips; i++) {
> - if (mask & (1 << i)) {
> - unsigned long upper, lower;
> -
> - upper = THERMAL_NO_LIMIT;
> - lower = THERMAL_NO_LIMIT;
> - if (limits) {
> - lower = limits[i * 2];
> - upper = limits[i * 2 + 1];
> - }
> - ret = thermal_zone_bind_cooling_device(tz, i, cdev,
> - upper, lower,
> - weight);
> - if (ret)
> - print_bind_err_msg(tz, cdev, ret);
> - }
> - }
> -}
> -
> static void bind_cdev(struct thermal_cooling_device *cdev)
> {
> - int i, ret;
> - const struct thermal_zone_params *tzp;
> + int ret;
> struct thermal_zone_device *pos = NULL;
>
> mutex_lock(&thermal_list_lock);
>
> list_for_each_entry(pos, &thermal_tz_list, node) {
> - if (!pos->tzp && !pos->ops->bind)
> + if (!pos->ops->bind)
> continue;
>
> - if (pos->ops->bind) {
> - ret = pos->ops->bind(pos, cdev);
> - if (ret)
> - print_bind_err_msg(pos, cdev, ret);
> - continue;
> - }
> -
> - tzp = pos->tzp;
> - if (!tzp || !tzp->tbp)
> - continue;
> -
> - for (i = 0; i < tzp->num_tbps; i++) {
> - if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
> - continue;
> - if (tzp->tbp[i].match(pos, cdev))
> - continue;
> - tzp->tbp[i].cdev = cdev;
> - __bind(pos, tzp->tbp[i].trip_mask, cdev,
> - tzp->tbp[i].binding_limits,
> - tzp->tbp[i].weight);
> - }
> + ret = pos->ops->bind(pos, cdev);
> + if (ret)
> + print_bind_err_msg(pos, cdev, ret);
> }
>
> mutex_unlock(&thermal_list_lock);
> @@ -1138,16 +1093,6 @@ void thermal_cooling_device_update(struct thermal_cooling_device *cdev)
> }
> EXPORT_SYMBOL_GPL(thermal_cooling_device_update);
>
> -static void __unbind(struct thermal_zone_device *tz, int mask,
> - struct thermal_cooling_device *cdev)
> -{
> - int i;
> -
> - for (i = 0; i < tz->num_trips; i++)
> - if (mask & (1 << i))
> - thermal_zone_unbind_cooling_device(tz, i, cdev);
> -}
> -
> /**
> * thermal_cooling_device_unregister - removes a thermal cooling device
> * @cdev: the thermal cooling device to remove.
> @@ -1157,8 +1102,6 @@ static void __unbind(struct thermal_zone_device *tz, int mask,
> */
> void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
> {
> - int i;
> - const struct thermal_zone_params *tzp;
> struct thermal_zone_device *tz;
>
> if (!cdev)
> @@ -1175,21 +1118,8 @@ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
>
> /* Unbind all thermal zones associated with 'this' cdev */
> list_for_each_entry(tz, &thermal_tz_list, node) {
> - if (tz->ops->unbind) {
> + if (tz->ops->unbind)
> tz->ops->unbind(tz, cdev);
> - continue;
> - }
> -
> - if (!tz->tzp || !tz->tzp->tbp)
> - continue;
> -
> - tzp = tz->tzp;
> - for (i = 0; i < tzp->num_tbps; i++) {
> - if (tzp->tbp[i].cdev == cdev) {
> - __unbind(tz, tzp->tbp[i].trip_mask, cdev);
> - tzp->tbp[i].cdev = NULL;
> - }
> - }
> }
>
> mutex_lock(&cdev->lock);
> @@ -1204,41 +1134,20 @@ EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
>
> static void bind_tz(struct thermal_zone_device *tz)
> {
> - int i, ret;
> + int ret;
> struct thermal_cooling_device *pos = NULL;
> - const struct thermal_zone_params *tzp = tz->tzp;
>
> - if (!tzp && !tz->ops->bind)
> + if (!tz->ops->bind)
> return;
>
> mutex_lock(&thermal_list_lock);
>
> - /* If there is ops->bind, try to use ops->bind */
> - if (tz->ops->bind) {
> - list_for_each_entry(pos, &thermal_cdev_list, node) {
> - ret = tz->ops->bind(tz, pos);
> - if (ret)
> - print_bind_err_msg(tz, pos, ret);
> - }
> - goto exit;
> - }
> -
> - if (!tzp || !tzp->tbp)
> - goto exit;
> -
> list_for_each_entry(pos, &thermal_cdev_list, node) {
> - for (i = 0; i < tzp->num_tbps; i++) {
> - if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
> - continue;
> - if (tzp->tbp[i].match(tz, pos))
> - continue;
> - tzp->tbp[i].cdev = pos;
> - __bind(tz, tzp->tbp[i].trip_mask, pos,
> - tzp->tbp[i].binding_limits,
> - tzp->tbp[i].weight);
> - }
> + ret = tz->ops->bind(tz, pos);
> + if (ret)
> + print_bind_err_msg(tz, pos, ret);
> }
> -exit:
> +
> mutex_unlock(&thermal_list_lock);
> }
>
> @@ -1477,15 +1386,13 @@ EXPORT_SYMBOL_GPL(thermal_zone_device_register);
> */
> void thermal_zone_device_unregister(struct thermal_zone_device *tz)
> {
> - int i, tz_id;
> - const struct thermal_zone_params *tzp;
> + int tz_id;
> struct thermal_cooling_device *cdev;
> struct thermal_zone_device *pos = NULL;
>
> if (!tz)
> return;
>
> - tzp = tz->tzp;
> tz_id = tz->id;
>
> mutex_lock(&thermal_list_lock);
> @@ -1516,22 +1423,9 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
> continue;
>
> unbind:
> - if (tz->ops->unbind) {
> + if (tz->ops->unbind)
> tz->ops->unbind(tz, cdev);
> - goto deactivate;
> - }
> -
> - if (!tzp || !tzp->tbp)
> - break;
> -
> - for (i = 0; i < tzp->num_tbps; i++) {
> - if (tzp->tbp[i].cdev == cdev) {
> - __unbind(tz, tzp->tbp[i].trip_mask, cdev);
> - tzp->tbp[i].cdev = NULL;
> - }
> - }
>
> -deactivate:
> /*
> * The thermal instances for current thermal zone has been
> * removed. Update the cooling device in case it is activated
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 13c6aaed18df..481417d3b9b7 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -207,41 +207,6 @@ struct thermal_governor {
> struct list_head governor_list;
> };
>
> -/* Structure that holds binding parameters for a zone */
> -struct thermal_bind_params {
> - struct thermal_cooling_device *cdev;
> -
> - /*
> - * This is a measure of 'how effectively these devices can
> - * cool 'this' thermal zone. It shall be determined by
> - * platform characterization. This value is relative to the
> - * rest of the weights so a cooling device whose weight is
> - * double that of another cooling device is twice as
> - * effective. See Documentation/driver-api/thermal/sysfs-api.rst for more
> - * information.
> - */
> - int weight;
> -
> - /*
> - * This is a bit mask that gives the binding relation between this
> - * thermal zone and cdev, for a particular trip point.
> - * See Documentation/driver-api/thermal/sysfs-api.rst for more information.
> - */
> - int trip_mask;
> -
> - /*
> - * This is an array of cooling state limits. Must have exactly
> - * 2 * thermal_zone.number_of_trip_points. It is an array consisting
> - * of tuples <lower-state upper-state> of state limits. Each trip
> - * will be associated with one state limit tuple when binding.
> - * A NULL pointer means <THERMAL_NO_LIMITS THERMAL_NO_LIMITS>
> - * on all trips.
> - */
> - unsigned long *binding_limits;
> - int (*match) (struct thermal_zone_device *tz,
> - struct thermal_cooling_device *cdev);
> -};
> -
> /* Structure to define Thermal Zone parameters */
> struct thermal_zone_params {
> char governor_name[THERMAL_NAME_LENGTH];
> @@ -253,9 +218,6 @@ struct thermal_zone_params {
> */
> bool no_hwmon;
>
> - int num_tbps; /* Number of tbp entries */
> - struct thermal_bind_params *tbp;
> -
> /*
> * Sustainable power (heat) that this thermal zone can dissipate in
> * mW
> --
> 2.25.1
>
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