1 #include <linux/debugfs.h>
3 #include <linux/module.h>
4 #include <linux/seq_file.h>
5 #include <asm/pgtable.h>
7 static int ptdump_show(struct seq_file *m, void *v)
9 ptdump_walk_pgd_level_debugfs(m, NULL, false);
13 DEFINE_SHOW_ATTRIBUTE(ptdump);
15 static int ptdump_curknl_show(struct seq_file *m, void *v)
17 if (current->mm->pgd) {
18 down_read(¤t->mm->mmap_sem);
19 ptdump_walk_pgd_level_debugfs(m, current->mm->pgd, false);
20 up_read(¤t->mm->mmap_sem);
25 DEFINE_SHOW_ATTRIBUTE(ptdump_curknl);
27 #ifdef CONFIG_PAGE_TABLE_ISOLATION
28 static struct dentry *pe_curusr;
30 static int ptdump_curusr_show(struct seq_file *m, void *v)
32 if (current->mm->pgd) {
33 down_read(¤t->mm->mmap_sem);
34 ptdump_walk_pgd_level_debugfs(m, current->mm->pgd, true);
35 up_read(¤t->mm->mmap_sem);
40 DEFINE_SHOW_ATTRIBUTE(ptdump_curusr);
43 #if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
44 static struct dentry *pe_efi;
46 static int ptdump_efi_show(struct seq_file *m, void *v)
49 ptdump_walk_pgd_level_debugfs(m, efi_mm.pgd, false);
53 DEFINE_SHOW_ATTRIBUTE(ptdump_efi);
56 static struct dentry *dir, *pe_knl, *pe_curknl;
58 static int __init pt_dump_debug_init(void)
60 dir = debugfs_create_dir("page_tables", NULL);
64 pe_knl = debugfs_create_file("kernel", 0400, dir, NULL,
69 pe_curknl = debugfs_create_file("current_kernel", 0400,
70 dir, NULL, &ptdump_curknl_fops);
74 #ifdef CONFIG_PAGE_TABLE_ISOLATION
75 pe_curusr = debugfs_create_file("current_user", 0400,
76 dir, NULL, &ptdump_curusr_fops);
81 #if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
82 pe_efi = debugfs_create_file("efi", 0400, dir, NULL, &ptdump_efi_fops);
89 debugfs_remove_recursive(dir);
93 static void __exit pt_dump_debug_exit(void)
95 debugfs_remove_recursive(dir);
98 module_init(pt_dump_debug_init);
99 module_exit(pt_dump_debug_exit);
100 MODULE_LICENSE("GPL");
101 MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
102 MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables");