1 files changed, 85 insertions, 0 deletions

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 03751a01dbad..71c5528e1c35 100644
--- 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);