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 | |
10 | struct dentry *ras_get_debugfs_root(void) |
11 | { |
12 | return ras_debugfs_dir; |
13 | } |
14 | EXPORT_SYMBOL_GPL(ras_get_debugfs_root); |
15 | |
16 | int ras_userspace_consumers(void) |
17 | { |
18 | return atomic_read(v: &trace_count); |
19 | } |
20 | EXPORT_SYMBOL_GPL(ras_userspace_consumers); |
21 | |
22 | static int trace_show(struct seq_file *m, void *v) |
23 | { |
24 | return 0; |
25 | } |
26 | |
27 | static int trace_open(struct inode *inode, struct file *file) |
28 | { |
29 | atomic_inc(v: &trace_count); |
30 | return single_open(file, trace_show, NULL); |
31 | } |
32 | |
33 | static int trace_release(struct inode *inode, struct file *file) |
34 | { |
35 | atomic_dec(v: &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 | |
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(name: "daemon_active" , S_IRUSR, parent: ras_debugfs_dir, |
54 | NULL, fops: &trace_fops); |
55 | if (IS_ERR(ptr: fentry)) |
56 | return -ENODEV; |
57 | |
58 | return 0; |
59 | |
60 | } |
61 | |
62 | void __init ras_debugfs_init(void) |
63 | { |
64 | ras_debugfs_dir = debugfs_create_dir(name: "ras" , NULL); |
65 | } |
66 | |