summaryrefslogtreecommitdiff
path: root/arch/x86/mm/debug_pagetables.c
blob: 4a3b62f780b4058c2a34c998198a86670e42c3f9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/debugfs.h>
#include <linux/efi.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <asm/pgtable.h>

static int ptdump_show(struct seq_file *m, void *v)
{
	ptdump_walk_pgd_level_debugfs(m, &init_mm, false);
	return 0;
}

DEFINE_SHOW_ATTRIBUTE(ptdump);

static int ptdump_curknl_show(struct seq_file *m, void *v)
{
	if (current->mm->pgd)
		ptdump_walk_pgd_level_debugfs(m, current->mm, false);
	return 0;
}

DEFINE_SHOW_ATTRIBUTE(ptdump_curknl);

#ifdef CONFIG_PAGE_TABLE_ISOLATION
static int ptdump_curusr_show(struct seq_file *m, void *v)
{
	if (current->mm->pgd)
		ptdump_walk_pgd_level_debugfs(m, current->mm, true);
	return 0;
}

DEFINE_SHOW_ATTRIBUTE(ptdump_curusr);
#endif

#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
static int ptdump_efi_show(struct seq_file *m, void *v)
{
	if (efi_mm.pgd)
		ptdump_walk_pgd_level_debugfs(m, &efi_mm, false);
	return 0;
}

DEFINE_SHOW_ATTRIBUTE(ptdump_efi);
#endif

static struct dentry *dir;

static int __init pt_dump_debug_init(void)
{
	dir = debugfs_create_dir("page_tables", NULL);

	debugfs_create_file("kernel", 0400, dir, NULL, &ptdump_fops);
	debugfs_create_file("current_kernel", 0400, dir, NULL,
			    &ptdump_curknl_fops);

#ifdef CONFIG_PAGE_TABLE_ISOLATION
	debugfs_create_file("current_user", 0400, dir, NULL,
			    &ptdump_curusr_fops);
#endif
#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
	debugfs_create_file("efi", 0400, dir, NULL, &ptdump_efi_fops);
#endif
	return 0;
}

static void __exit pt_dump_debug_exit(void)
{
	debugfs_remove_recursive(dir);
}

module_init(pt_dump_debug_init);
module_exit(pt_dump_debug_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables");