blob: 0322acf67ea5efc88c6656b9dca3868d9764dc71 [file] [log] [blame]
Chen, Gongd963cd92014-06-11 14:02:20 -07001#include <linux/debugfs.h>
2
3static struct dentry *ras_debugfs_dir;
4
5static atomic_t trace_count = ATOMIC_INIT(0);
6
7int ras_userspace_consumers(void)
8{
9 return atomic_read(&trace_count);
10}
11EXPORT_SYMBOL_GPL(ras_userspace_consumers);
12
13static int trace_show(struct seq_file *m, void *v)
14{
15 return atomic_read(&trace_count);
16}
17
18static 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
24static int trace_release(struct inode *inode, struct file *file)
25{
26 atomic_dec(&trace_count);
27 return single_release(inode, file);
28}
29
30static const struct file_operations trace_fops = {
31 .open = trace_open,
32 .read = seq_read,
33 .llseek = seq_lseek,
34 .release = trace_release,
35};
36
37int __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
53void __init ras_debugfs_init(void)
54{
55 ras_debugfs_dir = debugfs_create_dir("ras", NULL);
56}