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Date: Mon, 15 Jan 2024 13:39:57 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: rafael@...nel.org, rui.zhang@...el.com, lukasz.luba@....com,
linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, kernel@...labora.com
Subject: Re: [RFC PATCH 01/26] thermal: Introduce
thermal_zone_device_register() and params structure
On 21/12/2023 13:48, AngeloGioacchino Del Regno wrote:
> In preparation for extending the thermal zone devices to actually have
> a name and disambiguation of thermal zone types/names, introduce a new
> thermal_zone_device_params structure which holds all of the parameters
> that are necessary to register a thermal zone device, then add a new
> function thermal_zone_device_register().
>
> The latter takes as parameter the newly introduced structure and is
> made to eventually replace all usages of the now deprecated function
> thermal_zone_device_register_with_trips() and of
> thermal_tripless_zone_device_register().
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
> drivers/thermal/thermal_core.c | 27 +++++++++++++++++++++++++++
> include/linux/thermal.h | 33 +++++++++++++++++++++++++++++++++
> 2 files changed, 60 insertions(+)
>
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index e5434cdbf23b..6be508eb2d72 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -1235,6 +1235,8 @@ EXPORT_SYMBOL_GPL(thermal_zone_get_crit_temp);
> * whether trip points have been crossed (0 for interrupt
> * driven systems)
> *
> + * This function is deprecated. See thermal_zone_device_register().
> + *
> * This interface function adds a new thermal zone device (sensor) to
> * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
> * thermal cooling devices registered at the same time.
> @@ -1409,6 +1411,7 @@ thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *t
> }
> EXPORT_SYMBOL_GPL(thermal_zone_device_register_with_trips);
>
> +/* This function is deprecated. See thermal_zone_device_register(). */
> struct thermal_zone_device *thermal_tripless_zone_device_register(
> const char *type,
> void *devdata,
> @@ -1420,6 +1423,30 @@ struct thermal_zone_device *thermal_tripless_zone_device_register(
> }
> EXPORT_SYMBOL_GPL(thermal_tripless_zone_device_register);
>
> +/**
> + * thermal_zone_device_register() - register a new thermal zone device
> + * @tzdp: Parameters of the new thermal zone device
> + * See struct thermal_zone_device_register.
> + *
> + * This interface function adds a new thermal zone device (sensor) to
> + * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
> + * thermal cooling devices registered at the same time.
> + * thermal_zone_device_unregister() must be called when the device is no
> + * longer needed. The passive cooling depends on the .get_trend() return value.
> + *
> + * Return: a pointer to the created struct thermal_zone_device or an
> + * in case of error, an ERR_PTR. Caller must check return value with
> + * IS_ERR*() helpers.
> + */
> +struct thermal_zone_device *thermal_zone_device_register(struct thermal_zone_device_params *tzdp)
> +{
> + return thermal_zone_device_register_with_trips(tzdp->type, tzdp->trips, tzdp->num_trips,
> + tzdp->mask, tzdp->devdata, tzdp->ops,
> + &tzdp->tzp, tzdp->passive_delay,
> + tzdp->polling_delay);
> +}
> +EXPORT_SYMBOL_GPL(thermal_zone_device_register);
> +
> void *thermal_zone_device_priv(struct thermal_zone_device *tzd)
> {
> return tzd->devdata;
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 98957bae08ff..c6ed33a7e468 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -258,6 +258,33 @@ struct thermal_zone_params {
> int offset;
> };
>
> +/**
> + * struct thermal_zone_device_params - parameters for a thermal zone device
> + * @type: the thermal zone device type
> + * @tzp: thermal zone platform parameters
> + * @ops: standard thermal zone device callbacks
> + * @devdata: private device data
> + * @trips: a pointer to an array of thermal trips, if any
> + * @num_trips: the number of trip points the thermal zone support
> + * @mask: a bit string indicating the writeablility of trip points
> + * @passive_delay: number of milliseconds to wait between polls when
> + * performing passive cooling
> + * @polling_delay: number of milliseconds to wait between polls when checking
> + * whether trip points have been crossed (0 for interrupt
> + * driven systems)
> + */
> +struct thermal_zone_device_params {
> + const char *type;
> + struct thermal_zone_params tzp;
> + struct thermal_zone_device_ops *ops;
> + void *devdata;
> + struct thermal_trip *trips;
> + int num_trips;
> + int mask;
> + int passive_delay;
> + int polling_delay;
> +};
From my POV, this "struct thermal_zone_params" has been always a
inadequate and catch-all structure. It will confuse with
thermal_zone_device_params
I suggest to cleanup a bit that by sorting the parameters in the right
structures where the result could be something like:
eg.
struct thermal_zone_params {
const char *type;
struct thermal_zone_device_ops *ops;
struct thermal_trip *trips;
int num_trips;
int passive_delay;
int polling_delay;
void *devdata;
bool no_hwmon;
};
struct thermal_governor_ipa_params {
u32 sustainable_power;
s32 k_po;
s32 k_pu;
s32 k_i;
s32 k_d;
s32 integral_cutoff;
int slope;
int offset;
};
struct thermal_governor_params {
char governor_name[THERMAL_NAME_LENGTH];
union {
struct thermal_governor_ipa_params ipa_params;
};
};
struct thermal_zone_device_params {
struct thermal_zone_params *tzp;
struct thermal_governor_params *tgp;
}
No functional changes just code reorg, being a series to be submitted
before the rest on these RFC changes (2->26)
> /* Function declarations */
> #ifdef CONFIG_THERMAL_OF
> struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, int id, void *data,
> @@ -310,6 +337,8 @@ struct thermal_zone_device *thermal_tripless_zone_device_register(
> struct thermal_zone_device_ops *ops,
> const struct thermal_zone_params *tzp);
>
> +struct thermal_zone_device *thermal_zone_device_register(struct thermal_zone_device_params *tzdp);
> +
> void thermal_zone_device_unregister(struct thermal_zone_device *tz);
>
> void *thermal_zone_device_priv(struct thermal_zone_device *tzd);
> @@ -372,6 +401,10 @@ static inline struct thermal_zone_device *thermal_tripless_zone_device_register(
> const struct thermal_zone_params *tzp)
> { return ERR_PTR(-ENODEV); }
>
> +static inline struct thermal_zone_device *thermal_zone_device_register(
> + struct thermal_zone_device_params *tzdp)
> +{ return ERR_PTR(-ENODEV); }
> +
> static inline void thermal_zone_device_unregister(struct thermal_zone_device *tz)
> { }
>
--
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