Report active and inactive suspend blockers in/sys/kernel/debug/suspend_blockers.
Signed-off-by: Arve Hjønnevåg <arve@xxxxxxxxxxx>--- kernel/power/suspend_blocker.c | 45 ++++++++++++++++++++++++++++++++++++++- 1 files changed, 43 insertions(+), 2 deletions(-)
diff --git a/kernel/power/suspend_blocker.c b/kernel/power/suspend_blocker.cindex 94832ca..da7248a 100644--- a/kernel/power/suspend_blocker.c+++ b/kernel/power/suspend_blocker.c@@ -18,6 +18,7 @@ #include <linux/suspend.h> #include <linux/suspend_blocker.h> #include <linux/sysdev.h>+#include <linux/debugfs.h> #include "power.h" enum {@@ -42,6 +43,7 @@ struct workqueue_struct *suspend_work_queue; struct suspend_blocker main_suspend_blocker; static suspend_state_t requested_suspend_state = PM_SUSPEND_MEM; static bool enable_suspend_blockers;+static struct dentry *suspend_blocker_stats_dentry; #define pr_info_time(fmt, args...) \ do { \@@ -55,6 +57,21 @@ static bool enable_suspend_blockers; tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec); \ } while (0); +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 void print_active_blockers_locked(void) { struct suspend_blocker *blocker;@@ -128,8 +145,8 @@ static struct sys_device suspend_block_sysdev = { /** * suspend_blocker_init() - Initialize a suspend blocker * @blocker: The 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_destroy. */@@ -257,6 +274,19 @@ void request_suspend_state(suspend_state_t state) spin_unlock_irqrestore(&state_lock, irqflags); } +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_block_init(void) { int ret;@@ -292,8 +322,18 @@ err_sysdev_class_register: return ret; } +static int __init suspend_block_postcore_init(void)+{+ if (!suspend_work_queue)+ return 0;+ suspend_blocker_stats_dentry = debugfs_create_file("suspend_blockers",+ S_IRUGO, NULL, NULL, &suspend_blocker_stats_fops);+ return 0;+}+ static void __exit suspend_block_exit(void) {+ debugfs_remove(suspend_blocker_stats_dentry); destroy_workqueue(suspend_work_queue); sysdev_unregister(&suspend_block_sysdev); sysdev_class_unregister(&suspend_block_sysclass);@@ -301,4 +341,5 @@ static void __exit suspend_block_exit(void) } core_initcall(suspend_block_init);+postcore_initcall(suspend_block_postcore_init); module_exit(suspend_block_exit);-- 1.6.1
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