On Tue, Aug 23, 2011 at 12:54 AM, MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx> wrote:
> 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@xxxxxxxxxxx>
> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
>
> ---
> Changed from v5
> - Seperated governor files from devfreq.c
> - Allow simple ondemand to be tuned for each device
> ---
> drivers/devfreq/Kconfig | 36 ++++++++++++
> drivers/devfreq/Makefile | 4 +
> drivers/devfreq/governor_performance.c | 24 ++++++++
> drivers/devfreq/governor_powersave.c | 24 ++++++++
> drivers/devfreq/governor_simpleondemand.c | 88 +++++++++++++++++++++++++++++
> drivers/devfreq/governor_userspace.c | 27 +++++++++
> include/linux/devfreq.h | 41 +++++++++++++
> 7 files changed, 244 insertions(+), 0 deletions(-)
> create mode 100644 drivers/devfreq/governor_performance.c
> create mode 100644 drivers/devfreq/governor_powersave.c
> create mode 100644 drivers/devfreq/governor_simpleondemand.c
> create mode 100644 drivers/devfreq/governor_userspace.c
>
> diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig
> index 1fb42de..643b055 100644
> --- a/drivers/devfreq/Kconfig
> +++ b/drivers/devfreq/Kconfig
> @@ -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
> diff --git a/drivers/devfreq/Makefile b/drivers/devfreq/Makefile
> index 168934a..4564a89 100644
> --- a/drivers/devfreq/Makefile
> +++ b/drivers/devfreq/Makefile
> @@ -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
> diff --git a/drivers/devfreq/governor_performance.c b/drivers/devfreq/governor_performance.c
> new file mode 100644
> index 0000000..c47eff8
> --- /dev/null
> +++ b/drivers/devfreq/governor_performance.c
> @@ -0,0 +1,24 @@
> +/*
> + * linux/drivers/devfreq/governor_performance.c
> + *
> + * Copyright (C) 2011 Samsung Electronics
> + * MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx>
> + *
> + * 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)
> +{
> + *freq = UINT_MAX; /* devfreq_do will run "floor" */
> + return 0;
> +}
> +
> +struct devfreq_governor devfreq_performance = {
> + .name = "performance",
> + .get_target_freq = devfreq_performance_func,
> +};
> diff --git a/drivers/devfreq/governor_powersave.c b/drivers/devfreq/governor_powersave.c
> new file mode 100644
> index 0000000..4f128d8
> --- /dev/null
> +++ b/drivers/devfreq/governor_powersave.c
> @@ -0,0 +1,24 @@
> +/*
> + * linux/drivers/devfreq/governor_powersave.c
> + *
> + * Copyright (C) 2011 Samsung Electronics
> + * MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx>
> + *
> + * 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)
> +{
> + *freq = 0; /* devfreq_do will run "ceiling" to 0 */
> + return 0;
> +}
> +
> +struct devfreq_governor devfreq_powersave = {
> + .name = "powersave",
> + .get_target_freq = devfreq_powersave_func,
> +};
> diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c
> new file mode 100644
> index 0000000..18fe8be
> --- /dev/null
> +++ b/drivers/devfreq/governor_simpleondemand.c
> @@ -0,0 +1,88 @@
> +/*
> + * linux/drivers/devfreq/governor_simpleondemand.c
> + *
> + * Copyright (C) 2011 Samsung Electronics
> + * MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx>
> + *
> + * 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, &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;
> +}
> +
> +struct devfreq_governor devfreq_simple_ondemand = {
> + .name = "simple_ondemand",
> + .get_target_freq = devfreq_simple_ondemand_func,
> +};
> diff --git a/drivers/devfreq/governor_userspace.c b/drivers/devfreq/governor_userspace.c
> new file mode 100644
> index 0000000..6af8b6d
> --- /dev/null
> +++ b/drivers/devfreq/governor_userspace.c
> @@ -0,0 +1,27 @@
> +/*
> + * linux/drivers/devfreq/governor_simpleondemand.c
> + *
> + * Copyright (C) 2011 Samsung Electronics
> + * MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx>
> + *
> + * 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_userspace_func(struct devfreq *df, unsigned long *freq)
> +{
> + if (df->user_set_freq == 0)
> + *freq = df->previous_freq; /* No user freq specified yet */
I think that user_set_freq == 0 is a valid request from a user. A
user might not know what the valid frequencies are for a device, but
knows that he/she wants the lowest one. Writing 0 to the sysfs value
should give the floor of the available frequencies.
> + else
> + *freq = df->user_set_freq;
> +
> + return 0;
> +}
> +
> +struct devfreq_governor devfreq_userspace = {
> + .name = "userspace",
> + .get_target_freq = devfreq_userspace_func,
> +};
The set_user_frequency attribute should be moved out of devfreq.c
(patch 4) and live here. There is no purpose to that entry except for
the userspace governor and it should not exist in sysfs unless this
governor is in use. To be clear, there should still be a read-only
show_frequency or something in devfreq.c.
This again touches on my long-standing complaints with this series'
design. set_user_frequency is an attribute that belongs to the
governor, not to the core. Such misplacement of attribute/entity
ownership is common in this series, but I won't go down that rabbit
hole again. In the mean time at least this one instance of the
problem for the userspace gov should be fixed up.
Regards,
Mike
> diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
> index 8252238..8f614fa 100644
> --- a/include/linux/devfreq.h
> +++ b/include/linux/devfreq.h
> @@ -13,6 +13,7 @@
> #ifndef __LINUX_DEVFREQ_H__
> #define __LINUX_DEVFREQ_H__
>
> +#include <linux/opp.h>
> #include <linux/notifier.h>
>
> #define DEVFREQ_NAME_LEN 16
> @@ -63,6 +64,8 @@ struct devfreq_governor {
> * "devfreq_monitor" executions to reevaluate
> * frequency/voltage of the device. Set by
> * profile's polling_ms interval.
> + * @user_set_freq User specified adequete frequency value (thru sysfs
> + * interface). Governors may and may not use this value.
> * @data Private data of the governor. The devfreq framework does not
> * touch this.
> *
> @@ -80,6 +83,7 @@ struct devfreq {
> unsigned long previous_freq;
> unsigned int next_polling;
>
> + unsigned long user_set_freq; /* governors may ignore this. */
> void *data; /* private data for governors */
> };
>
> @@ -89,6 +93,37 @@ extern int devfreq_add_device(struct device *dev,
> struct devfreq_governor *governor,
> void *data);
> extern int devfreq_remove_device(struct device *dev);
> +
> +#ifdef CONFIG_DEVFREQ_GOV_POWERSAVE
> +extern struct devfreq_governor devfreq_powersave;
> +#endif
> +#ifdef CONFIG_DEVFREQ_GOV_PERFORMANCE
> +extern struct devfreq_governor devfreq_performance;
> +#endif
> +#ifdef CONFIG_DEVFREQ_GOV_USERSPACE
> +extern struct devfreq_governor devfreq_userspace;
> +#endif
> +#ifdef CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND
> +extern 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 int devfreq_add_device(struct device *dev,
> struct devfreq_dev_profile *profile,
> @@ -102,6 +137,12 @@ static int devfreq_remove_device(struct device *dev)
> {
> return 0;
> }
> +
> +#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__ */
> --
> 1.7.4.1
>
>
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