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Commit 2c8db5be authored by Kalesh Singh's avatar Kalesh Singh Committed by Rafael J. Wysocki
Browse files

PM/sleep: Expose suspend stats in sysfs 



Userspace can get suspend stats from the suspend stats debugfs node.
Since debugfs doesn't have stable ABI, expose suspend stats in
sysfs under /sys/power/suspend_stats.

Signed-off-by: default avatarKalesh Singh <kaleshsingh@google.com>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent e21a712a

Documentation/ABI/testing/sysfs-power

+106 −0
Original line number Diff line number Diff line
@@ -301,3 +301,109 @@ Description: 


		Using this sysfs file will override any values that were

		set using the kernel command line for disk offset.



What:		/sys/power/suspend_stats

Date:		July 2019

Contact:	Kalesh Singh <kaleshsingh96@gmail.com>

Description:

		The /sys/power/suspend_stats directory contains suspend related

		statistics.



What:		/sys/power/suspend_stats/success

Date:		July 2019

Contact:	Kalesh Singh <kaleshsingh96@gmail.com>

Description:

		The /sys/power/suspend_stats/success file contains the number

		of times entering system sleep state succeeded.



What:		/sys/power/suspend_stats/fail

Date:		July 2019

Contact:	Kalesh Singh <kaleshsingh96@gmail.com>

Description:

		The /sys/power/suspend_stats/fail file contains the number

		of times entering system sleep state failed.



What:		/sys/power/suspend_stats/failed_freeze

Date:		July 2019

Contact:	Kalesh Singh <kaleshsingh96@gmail.com>

Description:

		The /sys/power/suspend_stats/failed_freeze file contains the

		number of times freezing processes failed.



What:		/sys/power/suspend_stats/failed_prepare

Date:		July 2019

Contact:	Kalesh Singh <kaleshsingh96@gmail.com>

Description:

		The /sys/power/suspend_stats/failed_prepare file contains the

		number of times preparing all non-sysdev devices for

		a system PM transition failed.



What:		/sys/power/suspend_stats/failed_resume

Date:		July 2019

Contact:	Kalesh Singh <kaleshsingh96@gmail.com>

Description:

		The /sys/power/suspend_stats/failed_resume file contains the

		number of times executing "resume" callbacks of

		non-sysdev devices failed.



What:		/sys/power/suspend_stats/failed_resume_early

Date:		July 2019

Contact:	Kalesh Singh <kaleshsingh96@gmail.com>

Description:

		The /sys/power/suspend_stats/failed_resume_early file contains

		the number of times executing "early resume" callbacks

		of devices failed.



What:		/sys/power/suspend_stats/failed_resume_noirq

Date:		July 2019

Contact:	Kalesh Singh <kaleshsingh96@gmail.com>

Description:

		The /sys/power/suspend_stats/failed_resume_noirq file contains

		the number of times executing "noirq resume" callbacks

		of devices failed.



What:		/sys/power/suspend_stats/failed_suspend

Date:		July 2019

Contact:	Kalesh Singh <kaleshsingh96@gmail.com>

Description:

		The /sys/power/suspend_stats/failed_suspend file contains

		the number of times executing "suspend" callbacks

		of all non-sysdev devices failed.



What:		/sys/power/suspend_stats/failed_suspend_late

Date:		July 2019

Contact:	Kalesh Singh <kaleshsingh96@gmail.com>

Description:

		The /sys/power/suspend_stats/failed_suspend_late file contains

		the number of times executing "late suspend" callbacks

		of all devices failed.



What:		/sys/power/suspend_stats/failed_suspend_noirq

Date:		July 2019

Contact:	Kalesh Singh <kaleshsingh96@gmail.com>

Description:

		The /sys/power/suspend_stats/failed_suspend_noirq file contains

		the number of times executing "noirq suspend" callbacks

		of all devices failed.



What:		/sys/power/suspend_stats/last_failed_dev

Date:		July 2019

Contact:	Kalesh Singh <kaleshsingh96@gmail.com>

Description:

		The /sys/power/suspend_stats/last_failed_dev file contains

		the last device for which a suspend/resume callback failed.



What:		/sys/power/suspend_stats/last_failed_errno

Date:		July 2019

Contact:	Kalesh Singh <kaleshsingh96@gmail.com>

Description:

		The /sys/power/suspend_stats/last_failed_errno file contains

		the errno of the last failed attempt at entering

		system sleep state.



What:		/sys/power/suspend_stats/last_failed_step

Date:		July 2019

Contact:	Kalesh Singh <kaleshsingh96@gmail.com>

Description:

		The /sys/power/suspend_stats/last_failed_step file contains

		the last failed step in the suspend/resume path.

kernel/power/main.c

+95 −2
Original line number Diff line number Diff line
@@ -254,7 +254,6 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, 
power_attr(pm_test);

#endif /* CONFIG_PM_SLEEP_DEBUG */



#ifdef CONFIG_DEBUG_FS

static char *suspend_step_name(enum suspend_stat_step step)

{

	switch (step) {
@@ -275,6 +274,92 @@ static char *suspend_step_name(enum suspend_stat_step step) 
	}

}



#define suspend_attr(_name)					\

static ssize_t _name##_show(struct kobject *kobj,		\

		struct kobj_attribute *attr, char *buf)		\

{								\

	return sprintf(buf, "%d\n", suspend_stats._name);	\

}								\

static struct kobj_attribute _name = __ATTR_RO(_name)



suspend_attr(success);

suspend_attr(fail);

suspend_attr(failed_freeze);

suspend_attr(failed_prepare);

suspend_attr(failed_suspend);

suspend_attr(failed_suspend_late);

suspend_attr(failed_suspend_noirq);

suspend_attr(failed_resume);

suspend_attr(failed_resume_early);

suspend_attr(failed_resume_noirq);



static ssize_t last_failed_dev_show(struct kobject *kobj,

		struct kobj_attribute *attr, char *buf)

{

	int index;

	char *last_failed_dev = NULL;



	index = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1;

	index %= REC_FAILED_NUM;

	last_failed_dev = suspend_stats.failed_devs[index];



	return sprintf(buf, "%s\n", last_failed_dev);

}

static struct kobj_attribute last_failed_dev = __ATTR_RO(last_failed_dev);



static ssize_t last_failed_errno_show(struct kobject *kobj,

		struct kobj_attribute *attr, char *buf)

{

	int index;

	int last_failed_errno;



	index = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1;

	index %= REC_FAILED_NUM;

	last_failed_errno = suspend_stats.errno[index];



	return sprintf(buf, "%d\n", last_failed_errno);

}

static struct kobj_attribute last_failed_errno = __ATTR_RO(last_failed_errno);



static ssize_t last_failed_step_show(struct kobject *kobj,

		struct kobj_attribute *attr, char *buf)

{

	int index;

	enum suspend_stat_step step;

	char *last_failed_step = NULL;



	index = suspend_stats.last_failed_step + REC_FAILED_NUM - 1;

	index %= REC_FAILED_NUM;

	step = suspend_stats.failed_steps[index];

	last_failed_step = suspend_step_name(step);



	return sprintf(buf, "%s\n", last_failed_step);

}

static struct kobj_attribute last_failed_step = __ATTR_RO(last_failed_step);



static struct attribute *suspend_attrs[] = {

	&success.attr,

	&fail.attr,

	&failed_freeze.attr,

	&failed_prepare.attr,

	&failed_suspend.attr,

	&failed_suspend_late.attr,

	&failed_suspend_noirq.attr,

	&failed_resume.attr,

	&failed_resume_early.attr,

	&failed_resume_noirq.attr,

	&last_failed_dev.attr,

	&last_failed_errno.attr,

	&last_failed_step.attr,

	NULL,

};



static struct attribute_group suspend_attr_group = {

	.name = "suspend_stats",

	.attrs = suspend_attrs,

};



#ifdef CONFIG_DEBUG_FS

static int suspend_stats_show(struct seq_file *s, void *unused)

{

	int i, index, last_dev, last_errno, last_step;
@@ -794,6 +879,14 @@ static const struct attribute_group attr_group = { 
	.attrs = g,

};



static const struct attribute_group *attr_groups[] = {

	&attr_group,

#ifdef CONFIG_PM_SLEEP

	&suspend_attr_group,

#endif

	NULL,

};



struct workqueue_struct *pm_wq;

EXPORT_SYMBOL_GPL(pm_wq);
@@ -815,7 +908,7 @@ static int __init pm_init(void) 
	power_kobj = kobject_create_and_add("power", NULL);

	if (!power_kobj)

		return -ENOMEM;

	error = sysfs_create_group(power_kobj, &attr_group);

	error = sysfs_create_groups(power_kobj, attr_groups);

	if (error)

		return error;

	pm_print_times_init();