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: Kalesh Singh <[email protected]>
---
kernel/power/main.c | 77 +++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 75 insertions(+), 2 deletions(-)
diff --git a/kernel/power/main.c b/kernel/power/main.c
index bdbd605c4215..2a0edfcd50dc 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -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 +274,72 @@ 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) \
+{ \
+ int index; \
+ enum suspend_stat_step step; \
+ char *last_failed_stat = NULL; \
+ \
+ if (strcmp(attr->attr.name, "last_failed_dev") == 0) { \
+ index = suspend_stats._name + REC_FAILED_NUM - 1; \
+ index %= REC_FAILED_NUM; \
+ last_failed_stat = suspend_stats.failed_devs[index]; \
+ return sprintf(buf, "%s\n", last_failed_stat); \
+ } else if (strcmp(attr->attr.name, "last_failed_step") == 0) { \
+ index = suspend_stats._name + REC_FAILED_NUM - 1; \
+ index %= REC_FAILED_NUM; \
+ step = suspend_stats.failed_steps[index]; \
+ last_failed_stat = suspend_step_name(step); \
+ return sprintf(buf, "%s\n", last_failed_stat); \
+ } else if (strcmp(attr->attr.name, "last_failed_errno") == 0) { \
+ index = suspend_stats._name + REC_FAILED_NUM - 1; \
+ index %= REC_FAILED_NUM; \
+ return sprintf(buf, "%d\n", suspend_stats.errno[index]);\
+ } \
+ \
+ 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);
+suspend_attr(last_failed_dev);
+suspend_attr(last_failed_errno);
+suspend_attr(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 +859,14 @@ 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 +888,7 @@ 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();
--
2.22.0.770.g0f2c4a37fd-goog
On Tue, Jul 30, 2019 at 03:52:28PM -0700, Kalesh Singh wrote:
> +#define suspend_attr(_name) \
> +static ssize_t _name##_show(struct kobject *kobj, \
> + struct kobj_attribute *attr, char *buf) \
> +{ \
> + int index; \
> + enum suspend_stat_step step; \
> + char *last_failed_stat = NULL; \
> + \
> + if (strcmp(attr->attr.name, "last_failed_dev") == 0) { \
> + index = suspend_stats._name + REC_FAILED_NUM - 1; \
> + index %= REC_FAILED_NUM; \
> + last_failed_stat = suspend_stats.failed_devs[index]; \
> + return sprintf(buf, "%s\n", last_failed_stat); \
> + } else if (strcmp(attr->attr.name, "last_failed_step") == 0) { \
> + index = suspend_stats._name + REC_FAILED_NUM - 1; \
> + index %= REC_FAILED_NUM; \
> + step = suspend_stats.failed_steps[index]; \
> + last_failed_stat = suspend_step_name(step); \
> + return sprintf(buf, "%s\n", last_failed_stat); \
> + } else if (strcmp(attr->attr.name, "last_failed_errno") == 0) { \
> + index = suspend_stats._name + REC_FAILED_NUM - 1; \
> + index %= REC_FAILED_NUM; \
> + return sprintf(buf, "%d\n", suspend_stats.errno[index]);\
> + } \
For these 3 "special" ones, just have your own show function, no need to
cram it into this macro, making a bunch of unused code be generated all
the time.
thanks,
greg k-h
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: Kalesh Singh <[email protected]>
---
Changes in v2:
- Added separate show functions for last_failed_* stats, as per Greg
- Updated ABI Documentation
Documentation/ABI/testing/sysfs-power | 106 ++++++++++++++++++++++++++
kernel/power/main.c | 97 ++++++++++++++++++++++-
2 files changed, 201 insertions(+), 2 deletions(-)
diff --git a/Documentation/ABI/testing/sysfs-power b/Documentation/ABI/testing/sysfs-power
index 3c5130355011..6f87b9dd384b 100644
--- a/Documentation/ABI/testing/sysfs-power
+++ b/Documentation/ABI/testing/sysfs-power
@@ -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 <[email protected]>
+Description:
+ The /sys/power/suspend_stats directory contains suspend related
+ statistics.
+
+What: /sys/power/suspend_stats/success
+Date: July 2019
+Contact: Kalesh Singh <[email protected]>
+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 <[email protected]>
+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 <[email protected]>
+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 <[email protected]>
+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 <[email protected]>
+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 <[email protected]>
+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 <[email protected]>
+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 <[email protected]>
+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 <[email protected]>
+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 <[email protected]>
+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 <[email protected]>
+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 <[email protected]>
+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 <[email protected]>
+Description:
+ The /sys/power/suspend_stats/last_failed_step file contains
+ the last failed step in the suspend/resume path.
diff --git a/kernel/power/main.c b/kernel/power/main.c
index bdbd605c4215..938dc53a8b94 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -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();
--
2.22.0.770.g0f2c4a37fd-goog
On Wed, Jul 31, 2019 at 02:29:33PM -0700, Kalesh Singh wrote:
> 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: Kalesh Singh <[email protected]>
> ---
> Changes in v2:
> - Added separate show functions for last_failed_* stats, as per Greg
> - Updated ABI Documentation
This is nice, I didn't even know some of these were in the debugfs
entries, so this should be more helpful to people.
Reviewed-by: Greg Kroah-Hartman <[email protected]>
On Wed, Jul 31, 2019 at 11:19 PM Greg KH <[email protected]> wrote:
>
> On Wed, Jul 31, 2019 at 02:29:33PM -0700, Kalesh Singh wrote:
> > 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: Kalesh Singh <[email protected]>
> > ---
> > Changes in v2:
> > - Added separate show functions for last_failed_* stats, as per Greg
> > - Updated ABI Documentation
>
> This is nice, I didn't even know some of these were in the debugfs
> entries, so this should be more helpful to people.
>
> Reviewed-by: Greg Kroah-Hartman <[email protected]>
Thanks for the review Greg :)
On Thu, Aug 1, 2019 at 9:34 AM Kalesh Singh <[email protected]> wrote:
>
> On Wed, Jul 31, 2019 at 11:19 PM Greg KH <[email protected]> wrote:
> >
> > On Wed, Jul 31, 2019 at 02:29:33PM -0700, Kalesh Singh wrote:
> > > 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: Kalesh Singh <[email protected]>
> > > ---
> > > Changes in v2:
> > > - Added separate show functions for last_failed_* stats, as per Greg
> > > - Updated ABI Documentation
> >
> > This is nice, I didn't even know some of these were in the debugfs
> > entries, so this should be more helpful to people.
> >
> > Reviewed-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Tri Vo <[email protected]>
On Wednesday, July 31, 2019 11:29:33 PM CEST Kalesh Singh wrote:
> 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: Kalesh Singh <[email protected]>
> ---
> Changes in v2:
> - Added separate show functions for last_failed_* stats, as per Greg
> - Updated ABI Documentation
>
> Documentation/ABI/testing/sysfs-power | 106 ++++++++++++++++++++++++++
> kernel/power/main.c | 97 ++++++++++++++++++++++-
> 2 files changed, 201 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-power b/Documentation/ABI/testing/sysfs-power
> index 3c5130355011..6f87b9dd384b 100644
> --- a/Documentation/ABI/testing/sysfs-power
> +++ b/Documentation/ABI/testing/sysfs-power
> @@ -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 <[email protected]>
> +Description:
> + The /sys/power/suspend_stats directory contains suspend related
> + statistics.
> +
> +What: /sys/power/suspend_stats/success
> +Date: July 2019
> +Contact: Kalesh Singh <[email protected]>
> +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 <[email protected]>
> +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 <[email protected]>
> +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 <[email protected]>
> +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 <[email protected]>
> +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 <[email protected]>
> +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 <[email protected]>
> +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 <[email protected]>
> +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 <[email protected]>
> +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 <[email protected]>
> +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 <[email protected]>
> +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 <[email protected]>
> +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 <[email protected]>
> +Description:
> + The /sys/power/suspend_stats/last_failed_step file contains
> + the last failed step in the suspend/resume path.
> diff --git a/kernel/power/main.c b/kernel/power/main.c
> index bdbd605c4215..938dc53a8b94 100644
> --- a/kernel/power/main.c
> +++ b/kernel/power/main.c
> @@ -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();
>
Applied with the Greg's R-by, thanks!