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kernel_optimize_test/include/linux/thermal.h
Daniel Lezcano 1ce50e7d40 thermal: core: genetlink support for events/cmd/sampling 
Initially the thermal framework had a very simple notification
mechanism to send generic netlink messages to the userspace.

The notification function was never called from anywhere and the
corresponding dead code was removed. It was probably a first attempt
to introduce the netlink notification.

At LPC2018, the presentation "Linux thermal: User kernel interface",
proposed to create the notifications to the userspace via a kfifo.

The advantage of the kfifo is the performance. It is usually used from
a 1:1 communication channel where a driver captures data and sends it
as fast as possible to a userspace process.

The drawback is that only one process uses the notification channel
exclusively, thus no other process is allowed to use the channel to
get temperature or notifications.

This patch defines a generic netlink API to discover the current
thermal setup and adds event notifications as well as temperature
sampling. As any genetlink protocol, it can evolve and the versioning
allows to keep the backward compatibility.

In order to prevent the user from getting flooded with data on a
single channel, there are two multicast channels, one for the
temperature sampling when the thermal zone is updated and another one
for the events, so the user can get the events only without the
thermal zone temperature sampling.

Also, a list of commands to discover the thermal setup is added and
can be extended when needed.

Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Link: https://lore.kernel.org/r/20200706105538.2159-3-daniel.lezcano@linaro.org
2020-07-07 15:55:21 +02:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* thermal.h ($Revision: 0 $)
*
* Copyright (C) 2008 Intel Corp
* Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
* Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
*/
#ifndef __THERMAL_H__
#define __THERMAL_H__
#include <linux/of.h>
#include <linux/idr.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/workqueue.h>
#include <uapi/linux/thermal.h>
#define THERMAL_TRIPS_NONE -1
#define THERMAL_MAX_TRIPS 12
/* invalid cooling state */
#define THERMAL_CSTATE_INVALID -1UL
/* No upper/lower limit requirement */
#define THERMAL_NO_LIMIT ((u32)~0)
/* Default weight of a bound cooling device */
#define THERMAL_WEIGHT_DEFAULT 0
/* use value, which < 0K, to indicate an invalid/uninitialized temperature */
#define THERMAL_TEMP_INVALID -274000
struct thermal_zone_device;
struct thermal_cooling_device;
struct thermal_instance;
struct thermal_attr;
enum thermal_trend {
THERMAL_TREND_STABLE, /* temperature is stable */
THERMAL_TREND_RAISING, /* temperature is raising */
THERMAL_TREND_DROPPING, /* temperature is dropping */
THERMAL_TREND_RAISE_FULL, /* apply highest cooling action */
THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
};
/* Thermal notification reason */
enum thermal_notify_event {
THERMAL_EVENT_UNSPECIFIED, /* Unspecified event */
THERMAL_EVENT_TEMP_SAMPLE, /* New Temperature sample */
THERMAL_TRIP_VIOLATED, /* TRIP Point violation */
THERMAL_TRIP_CHANGED, /* TRIP Point temperature changed */
THERMAL_DEVICE_DOWN, /* Thermal device is down */
THERMAL_DEVICE_UP, /* Thermal device is up after a down event */
THERMAL_DEVICE_POWER_CAPABILITY_CHANGED, /* power capability changed */
THERMAL_TABLE_CHANGED, /* Thermal table(s) changed */
};
struct thermal_zone_device_ops {
int (*bind) (struct thermal_zone_device *,
struct thermal_cooling_device *);
int (*unbind) (struct thermal_zone_device *,
struct thermal_cooling_device *);
int (*get_temp) (struct thermal_zone_device *, int *);
int (*set_trips) (struct thermal_zone_device *, int, int);
int (*change_mode) (struct thermal_zone_device *,
enum thermal_device_mode);
int (*get_trip_type) (struct thermal_zone_device *, int,
enum thermal_trip_type *);
int (*get_trip_temp) (struct thermal_zone_device *, int, int *);
int (*set_trip_temp) (struct thermal_zone_device *, int, int);
int (*get_trip_hyst) (struct thermal_zone_device *, int, int *);
int (*set_trip_hyst) (struct thermal_zone_device *, int, int);
int (*get_crit_temp) (struct thermal_zone_device *, int *);
int (*set_emul_temp) (struct thermal_zone_device *, int);
int (*get_trend) (struct thermal_zone_device *, int,
enum thermal_trend *);
int (*notify) (struct thermal_zone_device *, int,
enum thermal_trip_type);
};
struct thermal_cooling_device_ops {
int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
int (*get_requested_power)(struct thermal_cooling_device *,
struct thermal_zone_device *, u32 *);
int (*state2power)(struct thermal_cooling_device *,
struct thermal_zone_device *, unsigned long, u32 *);
int (*power2state)(struct thermal_cooling_device *,
struct thermal_zone_device *, u32, unsigned long *);
};
struct thermal_cooling_device {
int id;
char type[THERMAL_NAME_LENGTH];
struct device device;
struct device_node *np;
void *devdata;
void *stats;
const struct thermal_cooling_device_ops *ops;
bool updated; /* true if the cooling device does not need update */
struct mutex lock; /* protect thermal_instances list */
struct list_head thermal_instances;
struct list_head node;
};
/**
* struct thermal_zone_device - structure for a thermal zone
* @id: unique id number for each thermal zone
* @type: the thermal zone device type
* @device: &struct device for this thermal zone
* @trip_temp_attrs: attributes for trip points for sysfs: trip temperature
* @trip_type_attrs: attributes for trip points for sysfs: trip type
* @trip_hyst_attrs: attributes for trip points for sysfs: trip hysteresis
* @mode: current mode of this thermal zone
* @devdata: private pointer for device private data
* @trips: number of trip points the thermal zone supports
* @trips_disabled; bitmap for disabled trips
* @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)
* @temperature: current temperature. This is only for core code,
* drivers should use thermal_zone_get_temp() to get the
* current temperature
* @last_temperature: previous temperature read
* @emul_temperature: emulated temperature when using CONFIG_THERMAL_EMULATION
* @passive: 1 if you've crossed a passive trip point, 0 otherwise.
* @prev_low_trip: the low current temperature if you've crossed a passive
trip point.
* @prev_high_trip: the above current temperature if you've crossed a
passive trip point.
* @forced_passive: If > 0, temperature at which to switch on all ACPI
* processor cooling devices. Currently only used by the
* step-wise governor.
* @need_update: if equals 1, thermal_zone_device_update needs to be invoked.
* @ops: operations this &thermal_zone_device supports
* @tzp: thermal zone parameters
* @governor: pointer to the governor for this thermal zone
* @governor_data: private pointer for governor data
* @thermal_instances: list of &struct thermal_instance of this thermal zone
* @ida: &struct ida to generate unique id for this zone's cooling
* devices
* @lock: lock to protect thermal_instances list
* @node: node in thermal_tz_list (in thermal_core.c)
* @poll_queue: delayed work for polling
* @notify_event: Last notification event
*/
struct thermal_zone_device {
int id;
char type[THERMAL_NAME_LENGTH];
struct device device;
struct attribute_group trips_attribute_group;
struct thermal_attr *trip_temp_attrs;
struct thermal_attr *trip_type_attrs;
struct thermal_attr *trip_hyst_attrs;
enum thermal_device_mode mode;
void *devdata;
int trips;
unsigned long trips_disabled; /* bitmap for disabled trips */
int passive_delay;
int polling_delay;
int temperature;
int last_temperature;
int emul_temperature;
int passive;
int prev_low_trip;
int prev_high_trip;
unsigned int forced_passive;
atomic_t need_update;
struct thermal_zone_device_ops *ops;
struct thermal_zone_params *tzp;
struct thermal_governor *governor;
void *governor_data;
struct list_head thermal_instances;
struct ida ida;
struct mutex lock;
struct list_head node;
struct delayed_work poll_queue;
enum thermal_notify_event notify_event;
};
/**
* struct thermal_governor - structure that holds thermal governor information
* @name: name of the governor
* @bind_to_tz: callback called when binding to a thermal zone. If it
* returns 0, the governor is bound to the thermal zone,
* otherwise it fails.
* @unbind_from_tz: callback called when a governor is unbound from a
* thermal zone.
* @throttle: callback called for every trip point even if temperature is
* below the trip point temperature
* @governor_list: node in thermal_governor_list (in thermal_core.c)
*/
struct thermal_governor {
char name[THERMAL_NAME_LENGTH];
int (*bind_to_tz)(struct thermal_zone_device *tz);
void (*unbind_from_tz)(struct thermal_zone_device *tz);
int (*throttle)(struct thermal_zone_device *tz, int trip);
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];
/*
* a boolean to indicate if the thermal to hwmon sysfs interface
* is required. when no_hwmon == false, a hwmon sysfs interface
* will be created. when no_hwmon == true, nothing will be done
*/
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
*/
u32 sustainable_power;
/*
* Proportional parameter of the PID controller when
* overshooting (i.e., when temperature is below the target)
*/
s32 k_po;
/*
* Proportional parameter of the PID controller when
* undershooting
*/
s32 k_pu;
/* Integral parameter of the PID controller */
s32 k_i;
/* Derivative parameter of the PID controller */
s32 k_d;
/* threshold below which the error is no longer accumulated */
s32 integral_cutoff;
/*
* @slope: slope of a linear temperature adjustment curve.
* Used by thermal zone drivers.
*/
int slope;
/*
* @offset: offset of a linear temperature adjustment curve.
* Used by thermal zone drivers (default 0).
*/
int offset;
};
/**
* struct thermal_zone_of_device_ops - scallbacks for handling DT based zones
*
* Mandatory:
* @get_temp: a pointer to a function that reads the sensor temperature.
*
* Optional:
* @get_trend: a pointer to a function that reads the sensor temperature trend.
* @set_trips: a pointer to a function that sets a temperature window. When
* this window is left the driver must inform the thermal core via
* thermal_zone_device_update.
* @set_emul_temp: a pointer to a function that sets sensor emulated
* temperature.
* @set_trip_temp: a pointer to a function that sets the trip temperature on
* hardware.
*/
struct thermal_zone_of_device_ops {
int (*get_temp)(void *, int *);
int (*get_trend)(void *, int, enum thermal_trend *);
int (*set_trips)(void *, int, int);
int (*set_emul_temp)(void *, int);
int (*set_trip_temp)(void *, int, int);
};
/* Function declarations */
#ifdef CONFIG_THERMAL_OF
int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
struct device_node *sensor_np,
u32 *id);
struct thermal_zone_device *
thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
const struct thermal_zone_of_device_ops *ops);
void thermal_zone_of_sensor_unregister(struct device *dev,
struct thermal_zone_device *tz);
struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
struct device *dev, int id, void *data,
const struct thermal_zone_of_device_ops *ops);
void devm_thermal_zone_of_sensor_unregister(struct device *dev,
struct thermal_zone_device *tz);
#else
static inline int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
struct device_node *sensor_np,
u32 *id)
{
return -ENOENT;
}
static inline struct thermal_zone_device *
thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
const struct thermal_zone_of_device_ops *ops)
{
return ERR_PTR(-ENODEV);
}
static inline
void thermal_zone_of_sensor_unregister(struct device *dev,
struct thermal_zone_device *tz)
{
}
static inline struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
struct device *dev, int id, void *data,
const struct thermal_zone_of_device_ops *ops)
{
return ERR_PTR(-ENODEV);
}
static inline
void devm_thermal_zone_of_sensor_unregister(struct device *dev,
struct thermal_zone_device *tz)
{
}
#endif
#ifdef CONFIG_THERMAL
struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
void *, struct thermal_zone_device_ops *,
struct thermal_zone_params *, int, int);
void thermal_zone_device_unregister(struct thermal_zone_device *);
int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
struct thermal_cooling_device *,
unsigned long, unsigned long,
unsigned int);
int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
struct thermal_cooling_device *);
void thermal_zone_device_update(struct thermal_zone_device *,
enum thermal_notify_event);
struct thermal_cooling_device *thermal_cooling_device_register(const char *,
void *, const struct thermal_cooling_device_ops *);
struct thermal_cooling_device *
thermal_of_cooling_device_register(struct device_node *np, const char *, void *,
const struct thermal_cooling_device_ops *);
struct thermal_cooling_device *
devm_thermal_of_cooling_device_register(struct device *dev,
struct device_node *np,
char *type, void *devdata,
const struct thermal_cooling_device_ops *ops);
void thermal_cooling_device_unregister(struct thermal_cooling_device *);
struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
int thermal_zone_get_slope(struct thermal_zone_device *tz);
int thermal_zone_get_offset(struct thermal_zone_device *tz);
void thermal_cdev_update(struct thermal_cooling_device *);
void thermal_notify_framework(struct thermal_zone_device *, int);
int thermal_zone_device_enable(struct thermal_zone_device *tz);
int thermal_zone_device_disable(struct thermal_zone_device *tz);
#else
static inline struct thermal_zone_device *thermal_zone_device_register(
const char *type, int trips, int mask, void *devdata,
struct thermal_zone_device_ops *ops,
struct thermal_zone_params *tzp,
int passive_delay, int polling_delay)
{ return ERR_PTR(-ENODEV); }
static inline void thermal_zone_device_unregister(
struct thermal_zone_device *tz)
{ }
static inline struct thermal_cooling_device *
thermal_cooling_device_register(char *type, void *devdata,
const struct thermal_cooling_device_ops *ops)
{ return ERR_PTR(-ENODEV); }
static inline struct thermal_cooling_device *
thermal_of_cooling_device_register(struct device_node *np,
char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
{ return ERR_PTR(-ENODEV); }
static inline struct thermal_cooling_device *
devm_thermal_of_cooling_device_register(struct device *dev,
struct device_node *np,
char *type, void *devdata,
const struct thermal_cooling_device_ops *ops)
{
return ERR_PTR(-ENODEV);
}
static inline void thermal_cooling_device_unregister(
struct thermal_cooling_device *cdev)
{ }
static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
const char *name)
{ return ERR_PTR(-ENODEV); }
static inline int thermal_zone_get_temp(
struct thermal_zone_device *tz, int *temp)
{ return -ENODEV; }
static inline int thermal_zone_get_slope(
struct thermal_zone_device *tz)
{ return -ENODEV; }
static inline int thermal_zone_get_offset(
struct thermal_zone_device *tz)
{ return -ENODEV; }
static inline void thermal_cdev_update(struct thermal_cooling_device *cdev)
{ }
static inline void thermal_notify_framework(struct thermal_zone_device *tz,
int trip)
{ }
static inline int thermal_zone_device_enable(struct thermal_zone_device *tz)
{ return -ENODEV; }
static inline int thermal_zone_device_disable(struct thermal_zone_device *tz)
{ return -ENODEV; }
#endif /* CONFIG_THERMAL */
#endif /* __THERMAL_H__ */
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