Commit c92445fa authored by Dominik Brodowski's avatar Dominik Brodowski Committed by Rafael J. Wysocki
Browse files

PM / Runtime: Add sysfs debug files 



Add a few sysfs files relating to runtime power management for
advanced debug purposes:

runtime_enabled: is runtime PM enabled for this device? States
	are "enabled", "disabled", "forbidden" or a combination
	of the latter two.

runtime_status:	what state is the device in currently? E.g., it
	reports "suspended" for runtime-suspended devices, and
        "active" for active devices. NOTE: if runtime_enabled
	returns "disabled", the value of this file may not
	reflect its physical state.

runtime_usage: the runtime PM usage count of a device

runtime_active_kids: the runtime PM children usage count of a device, or
	0 if the ignore_children flag is set.

Also, CONFIG_PM_SLEEP_ADVANCED_DEBUG is not defined in any Kconfig
file, so replace it with CONFIG_PM_ADVANCED_DEBUG.

Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent d6f9cda1

drivers/base/power/sysfs.c

+62 −3
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
#include <linux/device.h>

#include <linux/string.h>

#include <linux/pm_runtime.h>

#include <asm/atomic.h>

#include "power.h"



/*
@@ -143,7 +144,59 @@ wake_store(struct device * dev, struct device_attribute *attr, 


static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);



#ifdef CONFIG_PM_SLEEP_ADVANCED_DEBUG

#ifdef CONFIG_PM_ADVANCED_DEBUG

#ifdef CONFIG_PM_RUNTIME



static ssize_t rtpm_usagecount_show(struct device *dev,

				    struct device_attribute *attr, char *buf)

{

	return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));

}



static ssize_t rtpm_children_show(struct device *dev,

				  struct device_attribute *attr, char *buf)

{

	return sprintf(buf, "%d\n", dev->power.ignore_children ?

		0 : atomic_read(&dev->power.child_count));

}



static ssize_t rtpm_enabled_show(struct device *dev,

				 struct device_attribute *attr, char *buf)

{

	if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))

		return sprintf(buf, "disabled & forbidden\n");

	else if (dev->power.disable_depth)

		return sprintf(buf, "disabled\n");

	else if (dev->power.runtime_auto == false)

		return sprintf(buf, "forbidden\n");

	return sprintf(buf, "enabled\n");

}



static ssize_t rtpm_status_show(struct device *dev,

				struct device_attribute *attr, char *buf)

{

	if (dev->power.runtime_error)

		return sprintf(buf, "error\n");

	switch (dev->power.runtime_status) {

	case RPM_SUSPENDED:

		return sprintf(buf, "suspended\n");

	case RPM_SUSPENDING:

		return sprintf(buf, "suspending\n");

	case RPM_RESUMING:

		return sprintf(buf, "resuming\n");

	case RPM_ACTIVE:

		return sprintf(buf, "active\n");

	}

	return -EIO;

}



static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);

static DEVICE_ATTR(runtime_active_kids, 0444, rtpm_children_show, NULL);

static DEVICE_ATTR(runtime_status, 0444, rtpm_status_show, NULL);

static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);



#endif



static ssize_t async_show(struct device *dev, struct device_attribute *attr,

			  char *buf)

{
@@ -170,15 +223,21 @@ static ssize_t async_store(struct device *dev, struct device_attribute *attr, 
}



static DEVICE_ATTR(async, 0644, async_show, async_store);

#endif /* CONFIG_PM_SLEEP_ADVANCED_DEBUG */

#endif /* CONFIG_PM_ADVANCED_DEBUG */



static struct attribute * power_attrs[] = {

#ifdef CONFIG_PM_RUNTIME

	&dev_attr_control.attr,

#endif

	&dev_attr_wakeup.attr,

#ifdef CONFIG_PM_SLEEP_ADVANCED_DEBUG

#ifdef CONFIG_PM_ADVANCED_DEBUG

	&dev_attr_async.attr,

#ifdef CONFIG_PM_RUNTIME

	&dev_attr_runtime_usage.attr,

	&dev_attr_runtime_active_kids.attr,

	&dev_attr_runtime_status.attr,

	&dev_attr_runtime_enabled.attr,

#endif

#endif

	NULL,

};

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