1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/debugfs.h> 3 #include <linux/seq_file.h> 4 5 #include <asm/ptdump.h> 6 7 static int ptdump_show(struct seq_file *m, void *v) 8 { 9 struct ptdump_info *info = m->private; 10 ptdump_walk_pgd(m, info); 11 return 0; 12 } 13 14 static int ptdump_open(struct inode *inode, struct file *file) 15 { 16 return single_open(file, ptdump_show, inode->i_private); 17 } 18 19 static const struct file_operations ptdump_fops = { 20 .open = ptdump_open, 21 .read = seq_read, 22 .llseek = seq_lseek, 23 .release = single_release, 24 }; 25 26 int ptdump_debugfs_register(struct ptdump_info *info, const char *name) 27 { 28 struct dentry *pe; 29 pe = debugfs_create_file(name, 0400, NULL, info, &ptdump_fops); 30 return pe ? 0 : -ENOMEM; 31 32 } 33