diff mbox series

[v2,02/10] PM: sleep: stats: Use an array of step failure counters

Message ID 2192653.irdbgypaU6@kreacher
State New
Headers show
Series None | expand

Commit Message

Rafael J. Wysocki Jan. 29, 2024, 4:11 p.m. UTC 
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Instead of using a set of individual struct suspend_stats fields
representing suspend step failure counters, use an array of counters
indexed by enum suspend_stat_step for this purpose, which allows
dpm_save_failed_step() to increment the appropriate counter
automatically, so that its callers don't need to do that directly.

It also allows suspend_stats_show() to carry out a loop over the
counters array to print their values.

Because the counters cannot become negative, use unsigned int for
representing them.

The only user-observable impact of this change is a different
ordering of entries in the suspend_stats debugfs file which is not
expected to matter.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

v1 -> v2:
   * Use one cell less in suspend_stats.step_failures[] to avoid
     introducing an unused array cell (Stanislaw).

@Stanislaw: This is different from setting SUSPEND_FREEZE to 0, because
that would complicate printing in the sysfs attributes and the debugfs
code, so I've not added the R-by.

---
 drivers/base/power/main.c |   22 ++++++++-----------
 include/linux/suspend.h   |   12 +++-------
 kernel/power/main.c       |   51 ++++++++++++++++++++++++----------------------
 kernel/power/suspend.c    |    1 
 4 files changed, 40 insertions(+), 46 deletions(-)

Comments

Rafael J. Wysocki Jan. 30, 2024, 1:42 p.m. UTC | #1 
On Tue, Jan 30, 2024 at 8:02 AM Stanislaw Gruszka
<stanislaw.gruszka@linux.intel.com> wrote:
>
> On Mon, Jan 29, 2024 at 05:11:57PM +0100, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> >
> > Instead of using a set of individual struct suspend_stats fields
> > representing suspend step failure counters, use an array of counters
> > indexed by enum suspend_stat_step for this purpose, which allows
> > dpm_save_failed_step() to increment the appropriate counter
> > automatically, so that its callers don't need to do that directly.
> >
> > It also allows suspend_stats_show() to carry out a loop over the
> > counters array to print their values.
> >
> > Because the counters cannot become negative, use unsigned int for
> > representing them.
> >
> > The only user-observable impact of this change is a different
> > ordering of entries in the suspend_stats debugfs file which is not
> > expected to matter.
> >
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > ---
> >
> > v1 -> v2:
> >    * Use one cell less in suspend_stats.step_failures[] to avoid
> >      introducing an unused array cell (Stanislaw).
> >
> > @Stanislaw: This is different from setting SUSPEND_FREEZE to 0, because
> > that would complicate printing in the sysfs attributes and the debugfs
> > code, so I've not added the R-by.
>
> LGTM.
>
> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
>
> > +     for (step = SUSPEND_FREEZE; step <= SUSPEND_NR_STEPS; step++)
> > +             seq_printf(s, "failed_%s: %u\n", suspend_step_names[step],
> > +                        suspend_stats.step_failures[step-1]);
>
> Consider (in separate patch) removing SUSPEND_NONE from suspend_step_names[]
> and use step-1 for it as well.

SUSPEND_NONE is handy for printing an empty string when there are no
suspend-resume errors.
diff mbox series

Patch

Index: linux-pm/include/linux/suspend.h
===================================================================
--- linux-pm.orig/include/linux/suspend.h
+++ linux-pm/include/linux/suspend.h
@@ -52,17 +52,12 @@  enum suspend_stat_step {
 	SUSPEND_RESUME
 };
 
+#define SUSPEND_NR_STEPS	SUSPEND_RESUME
+
 struct suspend_stats {
+	unsigned int step_failures[SUSPEND_NR_STEPS];
 	int	success;
 	int	fail;
-	int	failed_freeze;
-	int	failed_prepare;
-	int	failed_suspend;
-	int	failed_suspend_late;
-	int	failed_suspend_noirq;
-	int	failed_resume;
-	int	failed_resume_early;
-	int	failed_resume_noirq;
 #define	REC_FAILED_NUM	2
 	int	last_failed_dev;
 	char	failed_devs[REC_FAILED_NUM][40];
@@ -95,6 +90,7 @@  static inline void dpm_save_failed_errno
 
 static inline void dpm_save_failed_step(enum suspend_stat_step step)
 {
+	suspend_stats.step_failures[step-1]++;
 	suspend_stats.failed_steps[suspend_stats.last_failed_step] = step;
 	suspend_stats.last_failed_step++;
 	suspend_stats.last_failed_step %= REC_FAILED_NUM;
Index: linux-pm/kernel/power/main.c
===================================================================
--- linux-pm.orig/kernel/power/main.c
+++ linux-pm/kernel/power/main.c
@@ -341,18 +341,28 @@  static struct kobj_attribute _name = __A
 
 suspend_attr(success, "%d\n");
 suspend_attr(fail, "%d\n");
-suspend_attr(failed_freeze, "%d\n");
-suspend_attr(failed_prepare, "%d\n");
-suspend_attr(failed_suspend, "%d\n");
-suspend_attr(failed_suspend_late, "%d\n");
-suspend_attr(failed_suspend_noirq, "%d\n");
-suspend_attr(failed_resume, "%d\n");
-suspend_attr(failed_resume_early, "%d\n");
-suspend_attr(failed_resume_noirq, "%d\n");
 suspend_attr(last_hw_sleep, "%llu\n");
 suspend_attr(total_hw_sleep, "%llu\n");
 suspend_attr(max_hw_sleep, "%llu\n");
 
+#define suspend_step_attr(_name, step)		\
+static ssize_t _name##_show(struct kobject *kobj,		\
+		struct kobj_attribute *attr, char *buf)		\
+{								\
+	return sprintf(buf, "%u\n",				\
+		       suspend_stats.step_failures[step-1]);	\
+}								\
+static struct kobj_attribute _name = __ATTR_RO(_name)
+
+suspend_step_attr(failed_freeze, SUSPEND_FREEZE);
+suspend_step_attr(failed_prepare, SUSPEND_PREPARE);
+suspend_step_attr(failed_suspend, SUSPEND_SUSPEND);
+suspend_step_attr(failed_suspend_late, SUSPEND_SUSPEND_LATE);
+suspend_step_attr(failed_suspend_noirq, SUSPEND_SUSPEND_NOIRQ);
+suspend_step_attr(failed_resume, SUSPEND_RESUME);
+suspend_step_attr(failed_resume_early, SUSPEND_RESUME_EARLY);
+suspend_step_attr(failed_resume_noirq, SUSPEND_RESUME_NOIRQ);
+
 static ssize_t last_failed_dev_show(struct kobject *kobj,
 		struct kobj_attribute *attr, char *buf)
 {
@@ -439,6 +449,7 @@  static const struct attribute_group susp
 static int suspend_stats_show(struct seq_file *s, void *unused)
 {
 	int i, index, last_dev, last_errno, last_step;
+	enum suspend_stat_step step;
 
 	last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1;
 	last_dev %= REC_FAILED_NUM;
@@ -446,22 +457,14 @@  static int suspend_stats_show(struct seq
 	last_errno %= REC_FAILED_NUM;
 	last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1;
 	last_step %= REC_FAILED_NUM;
-	seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n"
-			"%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n",
-			"success", suspend_stats.success,
-			"fail", suspend_stats.fail,
-			"failed_freeze", suspend_stats.failed_freeze,
-			"failed_prepare", suspend_stats.failed_prepare,
-			"failed_suspend", suspend_stats.failed_suspend,
-			"failed_suspend_late",
-				suspend_stats.failed_suspend_late,
-			"failed_suspend_noirq",
-				suspend_stats.failed_suspend_noirq,
-			"failed_resume", suspend_stats.failed_resume,
-			"failed_resume_early",
-				suspend_stats.failed_resume_early,
-			"failed_resume_noirq",
-				suspend_stats.failed_resume_noirq);
+
+	seq_printf(s, "success: %d\nfail: %d\n",
+		   suspend_stats.success, suspend_stats.fail);
+
+	for (step = SUSPEND_FREEZE; step <= SUSPEND_NR_STEPS; step++)
+		seq_printf(s, "failed_%s: %u\n", suspend_step_names[step],
+			   suspend_stats.step_failures[step-1]);
+
 	seq_printf(s,	"failures:\n  last_failed_dev:\t%-s\n",
 		   suspend_stats.failed_devs[last_dev]);
 	for (i = 1; i < REC_FAILED_NUM; i++) {
Index: linux-pm/kernel/power/suspend.c
===================================================================
--- linux-pm.orig/kernel/power/suspend.c
+++ linux-pm/kernel/power/suspend.c
@@ -367,7 +367,6 @@  static int suspend_prepare(suspend_state
 	if (!error)
 		return 0;
 
-	suspend_stats.failed_freeze++;
 	dpm_save_failed_step(SUSPEND_FREEZE);
 	pm_notifier_call_chain(PM_POST_SUSPEND);
  Restore:
Index: linux-pm/drivers/base/power/main.c
===================================================================
--- linux-pm.orig/drivers/base/power/main.c
+++ linux-pm/drivers/base/power/main.c
@@ -686,7 +686,6 @@  Out:
 	TRACE_RESUME(error);
 
 	if (error) {
-		suspend_stats.failed_resume_noirq++;
 		dpm_save_failed_step(SUSPEND_RESUME_NOIRQ);
 		dpm_save_failed_dev(dev_name(dev));
 		pm_dev_err(dev, state, async ? " async noirq" : " noirq", error);
@@ -817,7 +816,6 @@  Out:
 	complete_all(&dev->power.completion);
 
 	if (error) {
-		suspend_stats.failed_resume_early++;
 		dpm_save_failed_step(SUSPEND_RESUME_EARLY);
 		dpm_save_failed_dev(dev_name(dev));
 		pm_dev_err(dev, state, async ? " async early" : " early", error);
@@ -974,7 +972,6 @@  static void device_resume(struct device
 	TRACE_RESUME(error);
 
 	if (error) {
-		suspend_stats.failed_resume++;
 		dpm_save_failed_step(SUSPEND_RESUME);
 		dpm_save_failed_dev(dev_name(dev));
 		pm_dev_err(dev, state, async ? " async" : "", error);
@@ -1323,10 +1320,9 @@  static int dpm_noirq_suspend_devices(pm_
 	if (!error)
 		error = async_error;
 
-	if (error) {
-		suspend_stats.failed_suspend_noirq++;
+	if (error)
 		dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ);
-	}
+
 	dpm_show_time(starttime, state, error, "noirq");
 	trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false);
 	return error;
@@ -1509,8 +1505,8 @@  int dpm_suspend_late(pm_message_t state)
 	async_synchronize_full();
 	if (!error)
 		error = async_error;
+
 	if (error) {
-		suspend_stats.failed_suspend_late++;
 		dpm_save_failed_step(SUSPEND_SUSPEND_LATE);
 		dpm_resume_early(resume_event(state));
 	}
@@ -1789,10 +1785,10 @@  int dpm_suspend(pm_message_t state)
 	async_synchronize_full();
 	if (!error)
 		error = async_error;
-	if (error) {
-		suspend_stats.failed_suspend++;
+
+	if (error)
 		dpm_save_failed_step(SUSPEND_SUSPEND);
-	}
+
 	dpm_show_time(starttime, state, error, NULL);
 	trace_suspend_resume(TPS("dpm_suspend"), state.event, false);
 	return error;
@@ -1943,11 +1939,11 @@  int dpm_suspend_start(pm_message_t state
 	int error;
 
 	error = dpm_prepare(state);
-	if (error) {
-		suspend_stats.failed_prepare++;
+	if (error)
 		dpm_save_failed_step(SUSPEND_PREPARE);
-	} else
+	else
 		error = dpm_suspend(state);
+
 	dpm_show_time(starttime, state, error, "start");
 	return error;
 }