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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* governor.h - internal header for devfreq governors.
*
* Copyright (C) 2011 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@samsung.com>
*
* This header is for devfreq governors in drivers/devfreq/
*/
#ifndef _GOVERNOR_H
#define _GOVERNOR_H
#include <linux/devfreq.h>
#define DEVFREQ_NAME_LEN 16
#define to_devfreq(DEV) container_of((DEV), struct devfreq, dev)
/* Devfreq events */
#define DEVFREQ_GOV_START 0x1
#define DEVFREQ_GOV_STOP 0x2
#define DEVFREQ_GOV_UPDATE_INTERVAL 0x3
#define DEVFREQ_GOV_SUSPEND 0x4
#define DEVFREQ_GOV_RESUME 0x5
#define DEVFREQ_MIN_FREQ 0
#define DEVFREQ_MAX_FREQ ULONG_MAX
/*
* Definition of the governor feature flags
* - DEVFREQ_GOV_FLAG_IMMUTABLE
* : This governor is never changeable to other governors.
* - DEVFREQ_GOV_FLAG_IRQ_DRIVEN
* : The devfreq won't schedule the work for this governor.
*/
#define DEVFREQ_GOV_FLAG_IMMUTABLE BIT(0)
#define DEVFREQ_GOV_FLAG_IRQ_DRIVEN BIT(1)
/*
* Definition of governor attribute flags except for common sysfs attributes
* - DEVFREQ_GOV_ATTR_POLLING_INTERVAL
* : Indicate polling_interval sysfs attribute
* - DEVFREQ_GOV_ATTR_TIMER
* : Indicate timer sysfs attribute
*/
#define DEVFREQ_GOV_ATTR_POLLING_INTERVAL BIT(0)
#define DEVFREQ_GOV_ATTR_TIMER BIT(1)
/**
* struct devfreq_cpu_data - Hold the per-cpu data
* @node: list node
* @dev: reference to cpu device.
* @first_cpu: the cpumask of the first cpu of a policy.
* @opp_table: reference to cpu opp table.
* @cur_freq: the current frequency of the cpu.
* @min_freq: the min frequency of the cpu.
* @max_freq: the max frequency of the cpu.
*
* This structure stores the required cpu_data of a cpu.
* This is auto-populated by the governor.
*/
struct devfreq_cpu_data {
struct list_head node;
struct device *dev;
unsigned int first_cpu;
struct opp_table *opp_table;
unsigned int cur_freq;
unsigned int min_freq;
unsigned int max_freq;
};
/**
* struct devfreq_governor - Devfreq policy governor
* @node: list node - contains registered devfreq governors
* @name: Governor's name
* @attrs: Governor's sysfs attribute flags
* @flags: Governor's feature flags
* @get_target_freq: Returns desired operating frequency for the device.
* Basically, get_target_freq will run
* devfreq_dev_profile.get_dev_status() to get the
* status of the device (load = busy_time / total_time).
* @event_handler: Callback for devfreq core framework to notify events
* to governors. Events include per device governor
* init and exit, opp changes out of devfreq, suspend
* and resume of per device devfreq during device idle.
*
* Note that the callbacks are called with devfreq->lock locked by devfreq.
*/
struct devfreq_governor {
struct list_head node;
const char name[DEVFREQ_NAME_LEN];
const u64 attrs;
const u64 flags;
int (*get_target_freq)(struct devfreq *this, unsigned long *freq);
int (*event_handler)(struct devfreq *devfreq,
unsigned int event, void *data);
};
void devfreq_monitor_start(struct devfreq *devfreq);
void devfreq_monitor_stop(struct devfreq *devfreq);
void devfreq_monitor_suspend(struct devfreq *devfreq);
void devfreq_monitor_resume(struct devfreq *devfreq);
void devfreq_update_interval(struct devfreq *devfreq, unsigned int *delay);
int devfreq_add_governor(struct devfreq_governor *governor);
int devfreq_remove_governor(struct devfreq_governor *governor);
int devm_devfreq_add_governor(struct device *dev,
struct devfreq_governor *governor);
int devfreq_update_status(struct devfreq *devfreq, unsigned long freq);
int devfreq_update_target(struct devfreq *devfreq, unsigned long freq);
void devfreq_get_freq_range(struct devfreq *devfreq, unsigned long *min_freq,
unsigned long *max_freq);
static inline int devfreq_update_stats(struct devfreq *df)
{
if (!df->profile->get_dev_status)
return -EINVAL;
return df->profile->get_dev_status(df->dev.parent, &df->last_status);
}
#endif /* _GOVERNOR_H */
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