1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/debugfs.h>
4 #include <linux/module.h>
5 #include <linux/seq_file.h>
6 #include <asm/pgtable.h>
8 static int ptdump_show(struct seq_file
*m
, void *v
)
10 ptdump_walk_pgd_level_debugfs(m
, &init_mm
, false);
14 DEFINE_SHOW_ATTRIBUTE(ptdump
);
16 static int ptdump_curknl_show(struct seq_file
*m
, void *v
)
19 ptdump_walk_pgd_level_debugfs(m
, current
->mm
, false);
23 DEFINE_SHOW_ATTRIBUTE(ptdump_curknl
);
25 #ifdef CONFIG_PAGE_TABLE_ISOLATION
26 static int ptdump_curusr_show(struct seq_file
*m
, void *v
)
29 ptdump_walk_pgd_level_debugfs(m
, current
->mm
, true);
33 DEFINE_SHOW_ATTRIBUTE(ptdump_curusr
);
36 #if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
37 static int ptdump_efi_show(struct seq_file
*m
, void *v
)
40 ptdump_walk_pgd_level_debugfs(m
, &efi_mm
, false);
44 DEFINE_SHOW_ATTRIBUTE(ptdump_efi
);
47 static struct dentry
*dir
;
49 static int __init
pt_dump_debug_init(void)
51 dir
= debugfs_create_dir("page_tables", NULL
);
53 debugfs_create_file("kernel", 0400, dir
, NULL
, &ptdump_fops
);
54 debugfs_create_file("current_kernel", 0400, dir
, NULL
,
57 #ifdef CONFIG_PAGE_TABLE_ISOLATION
58 debugfs_create_file("current_user", 0400, dir
, NULL
,
61 #if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
62 debugfs_create_file("efi", 0400, dir
, NULL
, &ptdump_efi_fops
);
67 static void __exit
pt_dump_debug_exit(void)
69 debugfs_remove_recursive(dir
);
72 module_init(pt_dump_debug_init
);
73 module_exit(pt_dump_debug_exit
);
74 MODULE_LICENSE("GPL");
75 MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
76 MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables");