PM / sleep: Do not print debug messages by default

Debug messages from the system suspend/hibernation infrastructure can
fill up the entire kernel log buffer in some cases and anyway they
are only useful for debugging.  They depend on CONFIG_PM_DEBUG, but
that is set as a rule as some generally useful diagnostic facilities
depend on it too.

For this reason, avoid printing those messages by default, but make
it possible to turn them on as needed with the help of a new sysfs
attribute under /sys/power/.

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

3 files changed, 69 insertions, 17 deletions

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index e1914c7b85b1..e19ee179d211 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -651,7 +651,7 @@ static int load_image_and_restore(void)
 	int error;
 	unsigned int flags;
 
-	pr_debug("Loading hibernation image.\n");
+	pm_pr_dbg("Loading hibernation image.\n");
 
 	lock_device_hotplug();
 	error = create_basic_memory_bitmaps();
@@ -681,7 +681,7 @@ int hibernate(void)
 	bool snapshot_test = false;
 
 	if (!hibernation_available()) {
-		pr_debug("Hibernation not available.\n");
+		pm_pr_dbg("Hibernation not available.\n");
 		return -EPERM;
 	}
 
@@ -727,7 +727,7 @@ int hibernate(void)
 		else
 		        flags |= SF_CRC32_MODE;
 
-		pr_debug("Writing image.\n");
+		pm_pr_dbg("Writing image.\n");
 		error = swsusp_write(flags);
 		swsusp_free();
 		if (!error) {
@@ -739,7 +739,7 @@ int hibernate(void)
 		in_suspend = 0;
 		pm_restore_gfp_mask();
 	} else {
-		pr_debug("Image restored successfully.\n");
+		pm_pr_dbg("Image restored successfully.\n");
 	}
 
  Free_bitmaps:
@@ -747,7 +747,7 @@ int hibernate(void)
  Thaw:
 	unlock_device_hotplug();
 	if (snapshot_test) {
-		pr_debug("Checking hibernation image\n");
+		pm_pr_dbg("Checking hibernation image\n");
 		error = swsusp_check();
 		if (!error)
 			error = load_image_and_restore();
@@ -811,7 +811,7 @@ static int software_resume(void)
 		goto Unlock;
 	}
 
-	pr_debug("Checking hibernation image partition %s\n", resume_file);
+	pm_pr_dbg("Checking hibernation image partition %s\n", resume_file);
 
 	if (resume_delay) {
 		pr_info("Waiting %dsec before reading resume device ...\n",
@@ -853,10 +853,10 @@ static int software_resume(void)
 	}
 
  Check_image:
-	pr_debug("Hibernation image partition %d:%d present\n",
+	pm_pr_dbg("Hibernation image partition %d:%d present\n",
 		MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
 
-	pr_debug("Looking for hibernation image.\n");
+	pm_pr_dbg("Looking for hibernation image.\n");
 	error = swsusp_check();
 	if (error)
 		goto Unlock;
@@ -875,7 +875,7 @@ static int software_resume(void)
 		goto Close_Finish;
 	}
 
-	pr_debug("Preparing processes for restore.\n");
+	pm_pr_dbg("Preparing processes for restore.\n");
 	error = freeze_processes();
 	if (error)
 		goto Close_Finish;
@@ -888,7 +888,7 @@ static int software_resume(void)
 	/* For success case, the suspend path will release the lock */
  Unlock:
 	mutex_unlock(&pm_mutex);
-	pr_debug("Hibernation image not present or could not be loaded.\n");
+	pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
 	return error;
  Close_Finish:
 	swsusp_close(FMODE_READ);
@@ -1012,8 +1012,8 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
 		error = -EINVAL;
 
 	if (!error)
-		pr_debug("Hibernation mode set to '%s'\n",
-			 hibernation_modes[mode]);
+		pm_pr_dbg("Hibernation mode set to '%s'\n",
+			       hibernation_modes[mode]);
 	unlock_system_sleep();
 	return error ? error : n;
 }
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 42bd800a6755..5ce00902c7e3 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -361,6 +361,57 @@ static ssize_t pm_wakeup_irq_show(struct kobject *kobj,
 
 power_attr_ro(pm_wakeup_irq);
 
+static bool pm_debug_messages_on __read_mostly;
+
+static ssize_t pm_debug_messages_show(struct kobject *kobj,
+				      struct kobj_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n", pm_debug_messages_on);
+}
+
+static ssize_t pm_debug_messages_store(struct kobject *kobj,
+				       struct kobj_attribute *attr,
+				       const char *buf, size_t n)
+{
+	unsigned long val;
+
+	if (kstrtoul(buf, 10, &val))
+		return -EINVAL;
+
+	if (val > 1)
+		return -EINVAL;
+
+	pm_debug_messages_on = !!val;
+	return n;
+}
+
+power_attr(pm_debug_messages);
+
+/**
+ * pm_pr_dbg - Print a suspend debug message to the kernel log.
+ * @fmt: Message format.
+ *
+ * The message will be emitted if enabled through the pm_debug_messages
+ * sysfs attribute.
+ */
+void pm_pr_dbg(const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	if (!pm_debug_messages_on)
+		return;
+
+	va_start(args, fmt);
+
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	printk(KERN_DEBUG "PM: %pV", &vaf);
+
+	va_end(args);
+}
+
 #else /* !CONFIG_PM_SLEEP_DEBUG */
 static inline void pm_print_times_init(void) {}
 #endif /* CONFIG_PM_SLEEP_DEBUG */
@@ -697,6 +748,7 @@ static struct attribute * g[] = {
 #ifdef CONFIG_PM_SLEEP_DEBUG
 	&pm_print_times_attr.attr,
 	&pm_wakeup_irq_attr.attr,
+	&pm_debug_messages_attr.attr,
 #endif
 #endif
 #ifdef CONFIG_FREEZER
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index d0c0b96c2383..4f10773322fa 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -106,7 +106,7 @@ static void freeze_enter(void)
 
 static void s2idle_loop(void)
 {
-	pr_debug("PM: suspend-to-idle\n");
+	pm_pr_dbg("suspend-to-idle\n");
 
 	do {
 		freeze_enter();
@@ -124,7 +124,7 @@ static void s2idle_loop(void)
 		pm_wakeup_clear(false);
 	} while (!dpm_suspend_noirq(PMSG_SUSPEND));
 
-	pr_debug("PM: resume from suspend-to-idle\n");
+	pm_pr_dbg("resume from suspend-to-idle\n");
 }
 
 void freeze_wake(void)
@@ -547,7 +547,7 @@ static int enter_state(suspend_state_t state)
 	trace_suspend_resume(TPS("sync_filesystems"), 0, false);
 #endif
 
-	pr_debug("PM: Preparing system for sleep (%s)\n", pm_states[state]);
+	pm_pr_dbg("Preparing system for sleep (%s)\n", pm_states[state]);
 	pm_suspend_clear_flags();
 	error = suspend_prepare(state);
 	if (error)
@@ -557,13 +557,13 @@ static int enter_state(suspend_state_t state)
 		goto Finish;
 
 	trace_suspend_resume(TPS("suspend_enter"), state, false);
-	pr_debug("PM: Suspending system (%s)\n", pm_states[state]);
+	pm_pr_dbg("Suspending system (%s)\n", pm_states[state]);
 	pm_restrict_gfp_mask();
 	error = suspend_devices_and_enter(state);
 	pm_restore_gfp_mask();
 
  Finish:
-	pr_debug("PM: Finishing wakeup.\n");
+	pm_pr_dbg("Finishing wakeup.\n");
 	suspend_finish();
  Unlock:
 	mutex_unlock(&pm_mutex);