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Date: Fri, 31 Mar 2023 11:05:14 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
rafael.j.wysocki@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal/core: Remove thermal_bind_params structure
On Fri, Mar 31, 2023 at 10:49 AM Daniel Lezcano
<daniel.lezcano@...aro.org> wrote:
>
>
> Hi Rui,
>
>
> On 30/03/2023 12:45, Zhang Rui 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>
>
> Thanks for the cleanup, always good to remove unused code.
>
> Rafael, is it fine if I pick it ?
Sure, no problem.
>
> > ---
> > .../driver-api/thermal/sysfs-api.rst | 40 ------
> > drivers/thermal/thermal_core.c | 129 ++----------------
> > include/linux/thermal.h | 38 ------
> > 3 files changed, 11 insertions(+), 196 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 d51cacd66756..2e6a49dd527d 100644
> > --- a/drivers/thermal/thermal_core.c
> > +++ b/drivers/thermal/thermal_core.c
> > @@ -794,64 +794,18 @@ 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)
> > - 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);
> > }
> > }
> >
> > @@ -1138,16 +1092,6 @@ 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 +1101,6 @@ 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 +1117,8 @@ 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_unlock(&thermal_list_lock);
> > @@ -1200,41 +1129,20 @@ 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);
> > }
> >
> > @@ -1491,15 +1399,13 @@ EXPORT_SYMBOL_GPL(thermal_zone_device_id);
> > */
> > 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);
> > @@ -1514,22 +1420,9 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
> > list_del(&tz->node);
> >
> > /* Unbind all cdevs associated with 'this' thermal zone */
> > - list_for_each_entry(cdev, &thermal_cdev_list, node) {
> > - if (tz->ops->unbind) {
> > + list_for_each_entry(cdev, &thermal_cdev_list, node)
> > + if (tz->ops->unbind)
> > tz->ops->unbind(tz, cdev);
> > - continue;
> > - }
> > -
> > - 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;
> > - }
> > - }
> > - }
> >
> > mutex_unlock(&thermal_list_lock);
> >
> > diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> > index fef625f799ae..ab7460bfdcf6 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
>
> --
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