1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/debugfs.h>
3 #include <linux/ras.h>
4 #include "debugfs.h"
5
6 static struct dentry *ras_debugfs_dir;
7
8 static atomic_t trace_count = ATOMIC_INIT(0);
9
ras_get_debugfs_root(void)10 struct dentry *ras_get_debugfs_root(void)
11 {
12 return ras_debugfs_dir;
13 }
14 EXPORT_SYMBOL_GPL(ras_get_debugfs_root);
15
ras_userspace_consumers(void)16 int ras_userspace_consumers(void)
17 {
18 return atomic_read(&trace_count);
19 }
20 EXPORT_SYMBOL_GPL(ras_userspace_consumers);
21
trace_show(struct seq_file * m,void * v)22 static int trace_show(struct seq_file *m, void *v)
23 {
24 return 0;
25 }
26
trace_open(struct inode * inode,struct file * file)27 static int trace_open(struct inode *inode, struct file *file)
28 {
29 atomic_inc(&trace_count);
30 return single_open(file, trace_show, NULL);
31 }
32
trace_release(struct inode * inode,struct file * file)33 static int trace_release(struct inode *inode, struct file *file)
34 {
35 atomic_dec(&trace_count);
36 return single_release(inode, file);
37 }
38
39 static const struct file_operations trace_fops = {
40 .open = trace_open,
41 .read = seq_read,
42 .llseek = seq_lseek,
43 .release = trace_release,
44 };
45
ras_add_daemon_trace(void)46 int __init ras_add_daemon_trace(void)
47 {
48 struct dentry *fentry;
49
50 if (!ras_debugfs_dir)
51 return -ENOENT;
52
53 fentry = debugfs_create_file("daemon_active", S_IRUSR, ras_debugfs_dir,
54 NULL, &trace_fops);
55 if (IS_ERR(fentry))
56 return -ENODEV;
57
58 return 0;
59
60 }
61
ras_debugfs_init(void)62 void __init ras_debugfs_init(void)
63 {
64 ras_debugfs_dir = debugfs_create_dir("ras", NULL);
65 }
66