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(&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(&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(&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("daemon_active", S_IRUSR, ras_debugfs_dir,
48				     NULL, &trace_fops);
49	if (IS_ERR(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("ras", NULL);
59}