[PATCH 4/8] PM: suspend_block: Add debugfs file

Arve Hjønnevåg
2010-05-21T22:48:36Z

Report active and inactive suspend blockers in
/sys/kernel/debug/suspend_blockers.

Signed-off-by: Arve Hjønnevåg <arve@android.com>
---
kernel/power/opportunistic_suspend.c | 43 +++++++++++++++++++++++++++++++++-
1 files changed, 42 insertions(+), 1 deletions(-)

diff --git a/kernel/power/opportunistic_suspend.c b/kernel/power/opportunistic_suspend.c
index cc90b60..6b5eb1d 100644
--- a/kernel/power/opportunistic_suspend.c
+++ b/kernel/power/opportunistic_suspend.c
@@ -17,6 +17,7 @@
#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/suspend.h>
+#include <linux/debugfs.h>

#include "power.h"

@@ -151,7 +152,8 @@ EXPORT_SYMBOL(suspend_blocker_register);
/**
* suspend_blocker_init - Initialize a suspend blocker's name and register it.
* @blocker: Suspend blocker to initialize.
- * @name: The name of the suspend blocker to show in debug messages.
+ * @name: The name of the suspend blocker to show in debug messages and
+ * /sys/kernel/debug/suspend_blockers.
*
* The suspend blocker struct and name must not be freed before calling
* suspend_blocker_unregister().
@@ -296,3 +298,42 @@ void __init opportunistic_suspend_init(void)
suspend_block(&main_suspend_blocker);
suspend_blocker_register(&unknown_wakeup);
}
+
+static struct dentry *suspend_blocker_stats_dentry;
+
+static int suspend_blocker_stats_show(struct seq_file *m, void *unused)
+{
+ unsigned long irqflags;
+ struct suspend_blocker *blocker;
+
+ seq_puts(m, "name\tactive\n");
+ spin_lock_irqsave(&list_lock, irqflags);
+ list_for_each_entry(blocker, &inactive_blockers, link)
+ seq_printf(m, "\"%s\"\t0\n", blocker->name);
+ list_for_each_entry(blocker, &active_blockers, link)
+ seq_printf(m, "\"%s\"\t1\n", blocker->name);
+ spin_unlock_irqrestore(&list_lock, irqflags);
+ return 0;
+}
+
+static int suspend_blocker_stats_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, suspend_blocker_stats_show, NULL);
+}
+
+static const struct file_operations suspend_blocker_stats_fops = {
+ .owner = THIS_MODULE,
+ .open = suspend_blocker_stats_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init suspend_blocker_debugfs_init(void)
+{
+ suspend_blocker_stats_dentry = debugfs_create_file("suspend_blockers",
+ S_IRUGO, NULL, NULL, &suspend_blocker_stats_fops);
+ return 0;
+}
+
+postcore_initcall(suspend_blocker_debugfs_init);
--
1.6.5.1