1 #include <linux/debugfs.h>
2 #include <linux/module.h>
3 #include <linux/seq_file.h>
4 #include <asm/pgtable.h>
5
ptdump_show(struct seq_file * m,void * v)6 static int ptdump_show(struct seq_file *m, void *v)
7 {
8 ptdump_walk_pgd_level(m, NULL);
9 return 0;
10 }
11
ptdump_open(struct inode * inode,struct file * filp)12 static int ptdump_open(struct inode *inode, struct file *filp)
13 {
14 return single_open(filp, ptdump_show, NULL);
15 }
16
17 static const struct file_operations ptdump_fops = {
18 .owner = THIS_MODULE,
19 .open = ptdump_open,
20 .read = seq_read,
21 .llseek = seq_lseek,
22 .release = single_release,
23 };
24
25 static struct dentry *pe;
26
pt_dump_debug_init(void)27 static int __init pt_dump_debug_init(void)
28 {
29 pe = debugfs_create_file("kernel_page_tables", S_IRUSR, NULL, NULL,
30 &ptdump_fops);
31 if (!pe)
32 return -ENOMEM;
33
34 return 0;
35 }
36
pt_dump_debug_exit(void)37 static void __exit pt_dump_debug_exit(void)
38 {
39 debugfs_remove_recursive(pe);
40 }
41
42 module_init(pt_dump_debug_init);
43 module_exit(pt_dump_debug_exit);
44 MODULE_LICENSE("GPL");
45 MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
46 MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables");
47