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