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The passive governor requires the cpu data to get the next target frequency of devfreq device if depending on cpu. In order to reduce the unnecessary memory data, keep cpufreq_policy data for possible cpus instead of NR_CPU. Tested-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Johnson Wang <johnson.wang@mediatek.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
128 lines
4.0 KiB
C
128 lines
4.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* governor.h - internal header for devfreq governors.
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*
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* Copyright (C) 2011 Samsung Electronics
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* MyungJoo Ham <myungjoo.ham@samsung.com>
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*
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* This header is for devfreq governors in drivers/devfreq/
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*/
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#ifndef _GOVERNOR_H
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#define _GOVERNOR_H
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#include <linux/devfreq.h>
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#define DEVFREQ_NAME_LEN 16
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#define to_devfreq(DEV) container_of((DEV), struct devfreq, dev)
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/* Devfreq events */
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#define DEVFREQ_GOV_START 0x1
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#define DEVFREQ_GOV_STOP 0x2
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#define DEVFREQ_GOV_UPDATE_INTERVAL 0x3
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#define DEVFREQ_GOV_SUSPEND 0x4
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#define DEVFREQ_GOV_RESUME 0x5
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#define DEVFREQ_MIN_FREQ 0
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#define DEVFREQ_MAX_FREQ ULONG_MAX
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/*
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* Definition of the governor feature flags
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* - DEVFREQ_GOV_FLAG_IMMUTABLE
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* : This governor is never changeable to other governors.
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* - DEVFREQ_GOV_FLAG_IRQ_DRIVEN
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* : The devfreq won't schedule the work for this governor.
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*/
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#define DEVFREQ_GOV_FLAG_IMMUTABLE BIT(0)
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#define DEVFREQ_GOV_FLAG_IRQ_DRIVEN BIT(1)
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/*
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* Definition of governor attribute flags except for common sysfs attributes
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* - DEVFREQ_GOV_ATTR_POLLING_INTERVAL
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* : Indicate polling_interval sysfs attribute
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* - DEVFREQ_GOV_ATTR_TIMER
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* : Indicate timer sysfs attribute
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*/
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#define DEVFREQ_GOV_ATTR_POLLING_INTERVAL BIT(0)
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#define DEVFREQ_GOV_ATTR_TIMER BIT(1)
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/**
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* struct devfreq_cpu_data - Hold the per-cpu data
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* @node: list node
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* @dev: reference to cpu device.
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* @first_cpu: the cpumask of the first cpu of a policy.
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* @opp_table: reference to cpu opp table.
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* @cur_freq: the current frequency of the cpu.
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* @min_freq: the min frequency of the cpu.
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* @max_freq: the max frequency of the cpu.
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*
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* This structure stores the required cpu_data of a cpu.
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* This is auto-populated by the governor.
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*/
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struct devfreq_cpu_data {
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struct list_head node;
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struct device *dev;
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unsigned int first_cpu;
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struct opp_table *opp_table;
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unsigned int cur_freq;
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unsigned int min_freq;
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unsigned int max_freq;
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};
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/**
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* struct devfreq_governor - Devfreq policy governor
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* @node: list node - contains registered devfreq governors
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* @name: Governor's name
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* @attrs: Governor's sysfs attribute flags
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* @flags: Governor's feature flags
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* @get_target_freq: Returns desired operating frequency for the device.
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* Basically, get_target_freq will run
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* devfreq_dev_profile.get_dev_status() to get the
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* status of the device (load = busy_time / total_time).
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* @event_handler: Callback for devfreq core framework to notify events
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* to governors. Events include per device governor
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* init and exit, opp changes out of devfreq, suspend
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* and resume of per device devfreq during device idle.
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*
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* Note that the callbacks are called with devfreq->lock locked by devfreq.
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*/
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struct devfreq_governor {
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struct list_head node;
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const char name[DEVFREQ_NAME_LEN];
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const u64 attrs;
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const u64 flags;
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int (*get_target_freq)(struct devfreq *this, unsigned long *freq);
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int (*event_handler)(struct devfreq *devfreq,
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unsigned int event, void *data);
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};
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void devfreq_monitor_start(struct devfreq *devfreq);
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void devfreq_monitor_stop(struct devfreq *devfreq);
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void devfreq_monitor_suspend(struct devfreq *devfreq);
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void devfreq_monitor_resume(struct devfreq *devfreq);
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void devfreq_update_interval(struct devfreq *devfreq, unsigned int *delay);
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int devfreq_add_governor(struct devfreq_governor *governor);
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int devfreq_remove_governor(struct devfreq_governor *governor);
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int devm_devfreq_add_governor(struct device *dev,
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struct devfreq_governor *governor);
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int devfreq_update_status(struct devfreq *devfreq, unsigned long freq);
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int devfreq_update_target(struct devfreq *devfreq, unsigned long freq);
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void devfreq_get_freq_range(struct devfreq *devfreq, unsigned long *min_freq,
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unsigned long *max_freq);
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static inline int devfreq_update_stats(struct devfreq *df)
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{
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if (!df->profile->get_dev_status)
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return -EINVAL;
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return df->profile->get_dev_status(df->dev.parent, &df->last_status);
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}
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#endif /* _GOVERNOR_H */
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