PM / devfreq: Add basic governors

Four cpufreq-like governors are provided as examples.

powersave: use the lowest frequency possible. The user (device) should
set the polling_ms as 0 because polling is useless for this governor.

performance: use the highest freqeuncy possible. The user (device)
should set the polling_ms as 0 because polling is useless for this
governor.

userspace: use the user specified frequency stored at
devfreq.user_set_freq. With sysfs support in the following patch, a user
may set the value with the sysfs interface.

simple_ondemand: simplified version of cpufreq's ondemand governor.

When a user updates OPP entries (enable/disable/add), OPP framework
automatically notifies devfreq to update operating frequency
accordingly. Thus, devfreq users (device drivers) do not need to update
devfreq manually with OPP entry updates or set polling_ms for powersave
, performance, userspace, or any other "static" governors.

Note that these are given only as basic examples for governors and any
devices with devfreq may implement their own governors with the drivers
and use them.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Mike Turquette <mturquette@ti.com>
Acked-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
MyungJoo Ham 2011-10-02 00:19:34 +02:00 committed by Rafael J. Wysocki
parent 9005b65099
commit ce26c5bb95
8 changed files with 345 additions and 0 deletions

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@ -42,3 +42,11 @@ Description:
devfreq-provided central polling
(/sys/class/devfreq/.../central_polling is 0), this value
may be useless.
What: /sys/class/devfreq/.../userspace/set_freq
Date: September 2011
Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
Description:
The /sys/class/devfreq/.../userspace/set_freq shows and
sets the requested frequency for the devfreq object if
userspace governor is in effect.

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@ -34,6 +34,42 @@ menuconfig PM_DEVFREQ
if PM_DEVFREQ
comment "DEVFREQ Governors"
config DEVFREQ_GOV_SIMPLE_ONDEMAND
bool "Simple Ondemand"
help
Chooses frequency based on the recent load on the device. Works
similar as ONDEMAND governor of CPUFREQ does. A device with
Simple-Ondemand should be able to provide busy/total counter
values that imply the usage rate. A device may provide tuned
values to the governor with data field at devfreq_add_device().
config DEVFREQ_GOV_PERFORMANCE
bool "Performance"
help
Sets the frequency at the maximum available frequency.
This governor always returns UINT_MAX as frequency so that
the DEVFREQ framework returns the highest frequency available
at any time.
config DEVFREQ_GOV_POWERSAVE
bool "Powersave"
help
Sets the frequency at the minimum available frequency.
This governor always returns 0 as frequency so that
the DEVFREQ framework returns the lowest frequency available
at any time.
config DEVFREQ_GOV_USERSPACE
bool "Userspace"
help
Sets the frequency at the user specified one.
This governor returns the user configured frequency if there
has been an input to /sys/devices/.../power/devfreq_set_freq.
Otherwise, the governor does not change the frequnecy
given at the initialization.
comment "DEVFREQ Drivers"
endif # PM_DEVFREQ

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@ -1 +1,5 @@
obj-$(CONFIG_PM_DEVFREQ) += devfreq.o
obj-$(CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND) += governor_simpleondemand.o
obj-$(CONFIG_DEVFREQ_GOV_PERFORMANCE) += governor_performance.o
obj-$(CONFIG_DEVFREQ_GOV_POWERSAVE) += governor_powersave.o
obj-$(CONFIG_DEVFREQ_GOV_USERSPACE) += governor_userspace.o

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@ -0,0 +1,29 @@
/*
* linux/drivers/devfreq/governor_performance.c
*
* Copyright (C) 2011 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/devfreq.h>
static int devfreq_performance_func(struct devfreq *df,
unsigned long *freq)
{
/*
* target callback should be able to get floor value as
* said in devfreq.h
*/
*freq = UINT_MAX;
return 0;
}
const struct devfreq_governor devfreq_performance = {
.name = "performance",
.get_target_freq = devfreq_performance_func,
.no_central_polling = true,
};

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@ -0,0 +1,29 @@
/*
* linux/drivers/devfreq/governor_powersave.c
*
* Copyright (C) 2011 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/devfreq.h>
static int devfreq_powersave_func(struct devfreq *df,
unsigned long *freq)
{
/*
* target callback should be able to get ceiling value as
* said in devfreq.h
*/
*freq = 0;
return 0;
}
const struct devfreq_governor devfreq_powersave = {
.name = "powersave",
.get_target_freq = devfreq_powersave_func,
.no_central_polling = true,
};

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@ -0,0 +1,88 @@
/*
* linux/drivers/devfreq/governor_simpleondemand.c
*
* Copyright (C) 2011 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/errno.h>
#include <linux/devfreq.h>
#include <linux/math64.h>
/* Default constants for DevFreq-Simple-Ondemand (DFSO) */
#define DFSO_UPTHRESHOLD (90)
#define DFSO_DOWNDIFFERENCTIAL (5)
static int devfreq_simple_ondemand_func(struct devfreq *df,
unsigned long *freq)
{
struct devfreq_dev_status stat;
int err = df->profile->get_dev_status(df->dev.parent, &stat);
unsigned long long a, b;
unsigned int dfso_upthreshold = DFSO_UPTHRESHOLD;
unsigned int dfso_downdifferential = DFSO_DOWNDIFFERENCTIAL;
struct devfreq_simple_ondemand_data *data = df->data;
if (err)
return err;
if (data) {
if (data->upthreshold)
dfso_upthreshold = data->upthreshold;
if (data->downdifferential)
dfso_downdifferential = data->downdifferential;
}
if (dfso_upthreshold > 100 ||
dfso_upthreshold < dfso_downdifferential)
return -EINVAL;
/* Assume MAX if it is going to be divided by zero */
if (stat.total_time == 0) {
*freq = UINT_MAX;
return 0;
}
/* Prevent overflow */
if (stat.busy_time >= (1 << 24) || stat.total_time >= (1 << 24)) {
stat.busy_time >>= 7;
stat.total_time >>= 7;
}
/* Set MAX if it's busy enough */
if (stat.busy_time * 100 >
stat.total_time * dfso_upthreshold) {
*freq = UINT_MAX;
return 0;
}
/* Set MAX if we do not know the initial frequency */
if (stat.current_frequency == 0) {
*freq = UINT_MAX;
return 0;
}
/* Keep the current frequency */
if (stat.busy_time * 100 >
stat.total_time * (dfso_upthreshold - dfso_downdifferential)) {
*freq = stat.current_frequency;
return 0;
}
/* Set the desired frequency based on the load */
a = stat.busy_time;
a *= stat.current_frequency;
b = div_u64(a, stat.total_time);
b *= 100;
b = div_u64(b, (dfso_upthreshold - dfso_downdifferential / 2));
*freq = (unsigned long) b;
return 0;
}
const struct devfreq_governor devfreq_simple_ondemand = {
.name = "simple_ondemand",
.get_target_freq = devfreq_simple_ondemand_func,
};

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@ -0,0 +1,116 @@
/*
* linux/drivers/devfreq/governor_simpleondemand.c
*
* Copyright (C) 2011 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/devfreq.h>
#include <linux/pm.h>
#include <linux/mutex.h>
#include "governor.h"
struct userspace_data {
unsigned long user_frequency;
bool valid;
};
static int devfreq_userspace_func(struct devfreq *df, unsigned long *freq)
{
struct userspace_data *data = df->data;
if (!data->valid)
*freq = df->previous_freq; /* No user freq specified yet */
else
*freq = data->user_frequency;
return 0;
}
static ssize_t store_freq(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct devfreq *devfreq = to_devfreq(dev);
struct userspace_data *data;
unsigned long wanted;
int err = 0;
mutex_lock(&devfreq->lock);
data = devfreq->data;
sscanf(buf, "%lu", &wanted);
data->user_frequency = wanted;
data->valid = true;
err = update_devfreq(devfreq);
if (err == 0)
err = count;
mutex_unlock(&devfreq->lock);
return err;
}
static ssize_t show_freq(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct devfreq *devfreq = to_devfreq(dev);
struct userspace_data *data;
int err = 0;
mutex_lock(&devfreq->lock);
data = devfreq->data;
if (data->valid)
err = sprintf(buf, "%lu\n", data->user_frequency);
else
err = sprintf(buf, "undefined\n");
mutex_unlock(&devfreq->lock);
return err;
}
static DEVICE_ATTR(set_freq, 0644, show_freq, store_freq);
static struct attribute *dev_entries[] = {
&dev_attr_set_freq.attr,
NULL,
};
static struct attribute_group dev_attr_group = {
.name = "userspace",
.attrs = dev_entries,
};
static int userspace_init(struct devfreq *devfreq)
{
int err = 0;
struct userspace_data *data = kzalloc(sizeof(struct userspace_data),
GFP_KERNEL);
if (!data) {
err = -ENOMEM;
goto out;
}
data->valid = false;
devfreq->data = data;
err = sysfs_create_group(&devfreq->dev.kobj, &dev_attr_group);
out:
return err;
}
static void userspace_exit(struct devfreq *devfreq)
{
sysfs_remove_group(&devfreq->dev.kobj, &dev_attr_group);
kfree(devfreq->data);
devfreq->data = NULL;
}
const struct devfreq_governor devfreq_userspace = {
.name = "userspace",
.get_target_freq = devfreq_userspace_func,
.init = userspace_init,
.exit = userspace_exit,
.no_central_polling = true,
};

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@ -166,6 +166,36 @@ extern int devfreq_register_opp_notifier(struct device *dev,
extern int devfreq_unregister_opp_notifier(struct device *dev,
struct devfreq *devfreq);
#ifdef CONFIG_DEVFREQ_GOV_POWERSAVE
extern const struct devfreq_governor devfreq_powersave;
#endif
#ifdef CONFIG_DEVFREQ_GOV_PERFORMANCE
extern const struct devfreq_governor devfreq_performance;
#endif
#ifdef CONFIG_DEVFREQ_GOV_USERSPACE
extern const struct devfreq_governor devfreq_userspace;
#endif
#ifdef CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND
extern const struct devfreq_governor devfreq_simple_ondemand;
/**
* struct devfreq_simple_ondemand_data - void *data fed to struct devfreq
* and devfreq_add_device
* @ upthreshold If the load is over this value, the frequency jumps.
* Specify 0 to use the default. Valid value = 0 to 100.
* @ downdifferential If the load is under upthreshold - downdifferential,
* the governor may consider slowing the frequency down.
* Specify 0 to use the default. Valid value = 0 to 100.
* downdifferential < upthreshold must hold.
*
* If the fed devfreq_simple_ondemand_data pointer is NULL to the governor,
* the governor uses the default values.
*/
struct devfreq_simple_ondemand_data {
unsigned int upthreshold;
unsigned int downdifferential;
};
#endif
#else /* !CONFIG_PM_DEVFREQ */
static struct devfreq *devfreq_add_device(struct device *dev,
struct devfreq_dev_profile *profile,
@ -198,6 +228,11 @@ static int devfreq_unregister_opp_notifier(struct device *dev,
return -EINVAL;
}
#define devfreq_powersave NULL
#define devfreq_performance NULL
#define devfreq_userspace NULL
#define devfreq_simple_ondemand NULL
#endif /* CONFIG_PM_DEVFREQ */
#endif /* __LINUX_DEVFREQ_H__ */