PM / Wakeup: Show wakeup sources statistics in debugfs

There may be wakeup sources that aren't associated with any devices
and their statistics information won't be available from sysfs. Also,
for debugging purposes it is convenient to have all of the wakeup
sources statistics available from one place.  For these reasons,
introduce new file "wakeup_sources" in debugfs containing those
statistics.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 03751a01dbad4a05c7cdfbcbd2f1916d2f3890f2..71c5528e1c357a81112c6f79b1e91f013a58e3aa 100644 (file)
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -11,6 +11,8 @@
 #include <linux/sched.h>
 #include <linux/capability.h>
 #include <linux/suspend.h>
+#include <linux/seq_file.h>
+#include <linux/debugfs.h>
 
 #include "power.h"
 
@@ -617,3 +619,86 @@ bool pm_save_wakeup_count(unsigned int count)
                pm_wakeup_update_hit_counts();
        return ret;
 }
+
+static struct dentry *wakeup_sources_stats_dentry;
+
+/**
+ * print_wakeup_source_stats - Print wakeup source statistics information.
+ * @m: seq_file to print the statistics into.
+ * @ws: Wakeup source object to print the statistics for.
+ */
+static int print_wakeup_source_stats(struct seq_file *m,
+                                    struct wakeup_source *ws)
+{
+       unsigned long flags;
+       ktime_t total_time;
+       ktime_t max_time;
+       unsigned long active_count;
+       ktime_t active_time;
+       int ret;
+
+       spin_lock_irqsave(&ws->lock, flags);
+
+       total_time = ws->total_time;
+       max_time = ws->max_time;
+       active_count = ws->active_count;
+       if (ws->active) {
+               active_time = ktime_sub(ktime_get(), ws->last_time);
+               total_time = ktime_add(total_time, active_time);
+               if (active_time.tv64 > max_time.tv64)
+                       max_time = active_time;
+       } else {
+               active_time = ktime_set(0, 0);
+       }
+
+       ret = seq_printf(m, "%-12s\t%lu\t\t%lu\t\t%lu\t\t"
+                       "%lld\t\t%lld\t\t%lld\t\t%lld\n",
+                       ws->name, active_count, ws->event_count, ws->hit_count,
+                       ktime_to_ms(active_time), ktime_to_ms(total_time),
+                       ktime_to_ms(max_time), ktime_to_ms(ws->last_time));
+
+       spin_unlock_irqrestore(&ws->lock, flags);
+
+       return ret;
+}
+
+/**
+ * wakeup_sources_stats_show - Print wakeup sources statistics information.
+ * @m: seq_file to print the statistics into.
+ */
+static int wakeup_sources_stats_show(struct seq_file *m, void *unused)
+{
+       struct wakeup_source *ws;
+
+       seq_puts(m, "name\t\tactive_count\tevent_count\thit_count\t"
+               "active_since\ttotal_time\tmax_time\tlast_change\n");
+
+       rcu_read_lock();
+       list_for_each_entry_rcu(ws, &wakeup_sources, entry)
+               print_wakeup_source_stats(m, ws);
+       rcu_read_unlock();
+
+       return 0;
+}
+
+static int wakeup_sources_stats_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, wakeup_sources_stats_show, NULL);
+}
+
+static const struct file_operations wakeup_sources_stats_fops = {
+       .owner = THIS_MODULE,
+       .open = wakeup_sources_stats_open,
+       .read = seq_read,
+       .llseek = seq_lseek,
+       .release = single_release,
+};
+
+static int __init wakeup_sources_debugfs_init(void)
+{
+       wakeup_sources_stats_dentry = debugfs_create_file("wakeup_sources",
+                       S_IRUGO, NULL, NULL, &wakeup_sources_stats_fops);
+       return 0;
+}
+
+postcore_initcall(wakeup_sources_debugfs_init);