1 #include <linux/debugfs.h>
2 
3 struct dentry *ras_debugfs_dir;
4 
5 static atomic_t trace_count = ATOMIC_INIT(0);
6 
ras_userspace_consumers(void)7 int ras_userspace_consumers(void)
8 {
9 	return atomic_read(&trace_count);
10 }
11 EXPORT_SYMBOL_GPL(ras_userspace_consumers);
12 
trace_show(struct seq_file * m,void * v)13 static int trace_show(struct seq_file *m, void *v)
14 {
15 	return atomic_read(&trace_count);
16 }
17 
trace_open(struct inode * inode,struct file * file)18 static int trace_open(struct inode *inode, struct file *file)
19 {
20 	atomic_inc(&trace_count);
21 	return single_open(file, trace_show, NULL);
22 }
23 
trace_release(struct inode * inode,struct file * file)24 static int trace_release(struct inode *inode, struct file *file)
25 {
26 	atomic_dec(&trace_count);
27 	return single_release(inode, file);
28 }
29 
30 static const struct file_operations trace_fops = {
31 	.open    = trace_open,
32 	.read    = seq_read,
33 	.llseek  = seq_lseek,
34 	.release = trace_release,
35 };
36 
ras_add_daemon_trace(void)37 int __init ras_add_daemon_trace(void)
38 {
39 	struct dentry *fentry;
40 
41 	if (!ras_debugfs_dir)
42 		return -ENOENT;
43 
44 	fentry = debugfs_create_file("daemon_active", S_IRUSR, ras_debugfs_dir,
45 				     NULL, &trace_fops);
46 	if (!fentry)
47 		return -ENODEV;
48 
49 	return 0;
50 
51 }
52 
ras_debugfs_init(void)53 void __init ras_debugfs_init(void)
54 {
55 	ras_debugfs_dir = debugfs_create_dir("ras", NULL);
56 }
57