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

source code of linux/drivers/ras/debugfs.c