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PM / devfreq: Add clearing transitions stats

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Add clearing transition table and time in states devfreq statistics
by writing 0 (zero) to trans_stat file in devfreq sysfs. An example use
is like following:

echo 0 > /sys/class/devfreq/devfreqX/trans_stat

Signed-off-by: Kamil Konieczny <k.konieczny@samsung.com>
[cw00.choi: Edit return value if entering the wrong value for reset
 and use arrary3_size() to get the size of 3-dimensional array]
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Kamil Konieczny 2019-12-05 15:55:26 +01:00 committed by Chanwoo Choi
parent b76b3479da
commit 14a3439681
2 changed files with 35 additions and 5 deletions
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11
Documentation/ABI/testing/sysfs-class-devfreq
View File

@ -55,12 +55,15 @@ What: /sys/class/devfreq/.../trans_stat
Date: October 2012
Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
Description:
This ABI shows the statistics of devfreq behavior on a
specific device. It shows the time spent in each state and
the number of transitions between states.
This ABI shows or clears the statistics of devfreq behavior
on a specific device. It shows the time spent in each state
and the number of transitions between states.
In order to activate this ABI, the devfreq target device
driver should provide the list of available frequencies
with its profile.
with its profile. If need to reset the statistics of devfreq
behavior on a specific device, enter 0(zero) to 'trans_stat'
as following:
echo 0 > /sys/class/devfreq/.../trans_stat
What: /sys/class/devfreq/.../userspace/set_freq
Date: September 2011

29
drivers/devfreq/devfreq.c
View File

@ -1597,7 +1597,34 @@ static ssize_t trans_stat_show(struct device *dev,
devfreq->total_trans);
return len;
}
static DEVICE_ATTR_RO(trans_stat);
static ssize_t trans_stat_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct devfreq *df = to_devfreq(dev);
int err, value;
if (df->profile->max_state == 0)
return count;
err = kstrtoint(buf, 10, &value);
if (err || value != 0)
return -EINVAL;
mutex_lock(&df->lock);
memset(df->time_in_state, 0, (df->profile->max_state *
sizeof(*df->time_in_state)));
memset(df->trans_table, 0, array3_size(sizeof(unsigned int),
df->profile->max_state,
df->profile->max_state));
df->total_trans = 0;
df->last_stat_updated = get_jiffies_64();
mutex_unlock(&df->lock);
return count;
}
static DEVICE_ATTR_RW(trans_stat);
static struct attribute *devfreq_attrs[] = {
&dev_attr_name.attr,