| // 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"); |