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Commit 693bea3a authored by Kalesh Singh's avatar Kalesh Singh Committed by Tri Vo
Browse files

BACKPORT: 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>
(cherry picked from commit 2c8db5bef9fb442a5a0d2fee28aed20100362ce3)
[ fixed conflicts in Documentation ]
Bug: 129087298
Change-Id: Ia8f0d8551ae693cb5f3e1abc609fb9bbfeb695f5
Signed-off-by: default avatarTri Vo <trong@google.com>
parent 89c334d6

Documentation/ABI/testing/sysfs-power

+120 −0
Original line number Diff line number Diff line
@@ -285,3 +285,123 @@ Description: 
		Writing a "1" to this file enables the debug messages and

		writing a "0" (default) to it disables them.  Reads from

		this file return the current value.



What:		/sys/power/resume_offset

Date:		April 2018

Contact:	Mario Limonciello <mario.limonciello@dell.com>

Description:

		This file is used for telling the kernel an offset into a disk

		to use when hibernating the system such as with a swap file.



		Reads from this file will display the current offset

		the kernel will be using on the next hibernation

		attempt.



		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
@@ -213,7 +213,6 @@ 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) {
@@ -234,6 +233,92 @@ 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;
@@ -763,6 +848,14 @@ 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);
@@ -784,7 +877,7 @@ 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();