projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 8609d1b5 | 2 | #include <linux/debugfs.h> |
| 3ede3417 | 3 | #include <linux/efi.h> |
| 8609d1b5 KC |
4 | #include <linux/module.h> |
| 5 | #include <linux/seq_file.h> | |
| ca5999fd | 6 | #include <linux/pgtable.h> |
| 8609d1b5 KC |
7 | |
| 8 | static int ptdump_show(struct seq_file *m, void *v) | |
| 9 | { | |
| c5cfae12 | 10 | ptdump_walk_pgd_level_debugfs(m, &init_mm, false); |
| 8609d1b5 KC |
11 | return 0; |
| 12 | } | |
| 13 | ||
| 6848ac7c | 14 | DEFINE_SHOW_ATTRIBUTE(ptdump); |
| 8609d1b5 | 15 | |
| 6848ac7c | 16 | static int ptdump_curknl_show(struct seq_file *m, void *v) |
| a4b51ef6 | 17 | { |
| e47690d7 | 18 | if (current->mm->pgd) |
| c5cfae12 | 19 | ptdump_walk_pgd_level_debugfs(m, current->mm, false); |
| a4b51ef6 TG |
20 | return 0; |
| 21 | } | |
| 22 | ||
| 6848ac7c | 23 | DEFINE_SHOW_ATTRIBUTE(ptdump_curknl); |
| a4b51ef6 TG |
24 | |
| 25 | #ifdef CONFIG_PAGE_TABLE_ISOLATION | |
| 6848ac7c | 26 | static int ptdump_curusr_show(struct seq_file *m, void *v) |
| a4b51ef6 | 27 | { |
| e47690d7 | 28 | if (current->mm->pgd) |
| c5cfae12 | 29 | ptdump_walk_pgd_level_debugfs(m, current->mm, true); |
| a4b51ef6 TG |
30 | return 0; |
| 31 | } | |
| 32 | ||
| 6848ac7c | 33 | DEFINE_SHOW_ATTRIBUTE(ptdump_curusr); |
| a4b51ef6 TG |
34 | #endif |
| 35 | ||
| 116fef64 | 36 | #if defined(CONFIG_EFI) && defined(CONFIG_X86_64) |
| 6848ac7c | 37 | static int ptdump_efi_show(struct seq_file *m, void *v) |
| 116fef64 | 38 | { |
| 3ede3417 | 39 | if (efi_mm.pgd) |
| c5cfae12 | 40 | ptdump_walk_pgd_level_debugfs(m, &efi_mm, false); |
| 116fef64 AL |
41 | return 0; |
| 42 | } | |
| 43 | ||
| 6848ac7c | 44 | DEFINE_SHOW_ATTRIBUTE(ptdump_efi); |
| 116fef64 AL |
45 | #endif |
| 46 | ||
| 5dd82ba9 | 47 | static struct dentry *dir; |
| 8609d1b5 KC |
48 | |
| 49 | static int __init pt_dump_debug_init(void) | |
| 50 | { | |
| 75298aa1 | 51 | dir = debugfs_create_dir("page_tables", NULL); |
| a4b51ef6 | 52 | |
| 5dd82ba9 GKH |
53 | debugfs_create_file("kernel", 0400, dir, NULL, &ptdump_fops); |
| 54 | debugfs_create_file("current_kernel", 0400, dir, NULL, | |
| 55 | &ptdump_curknl_fops); | |
| a4b51ef6 TG |
56 | |
| 57 | #ifdef CONFIG_PAGE_TABLE_ISOLATION | |
| 5dd82ba9 GKH |
58 | debugfs_create_file("current_user", 0400, dir, NULL, |
| 59 | &ptdump_curusr_fops); | |
| a4b51ef6 | 60 | #endif |
| 116fef64 | 61 | #if defined(CONFIG_EFI) && defined(CONFIG_X86_64) |
| 5dd82ba9 | 62 | debugfs_create_file("efi", 0400, dir, NULL, &ptdump_efi_fops); |
| 116fef64 | 63 | #endif |
| 8609d1b5 KC |
64 | return 0; |
| 65 | } | |
| 66 | ||
| 67 | static void __exit pt_dump_debug_exit(void) | |
| 68 | { | |
| 75298aa1 | 69 | debugfs_remove_recursive(dir); |
| 8609d1b5 KC |
70 | } |
| 71 | ||
| 72 | module_init(pt_dump_debug_init); | |
| 73 | module_exit(pt_dump_debug_exit); | |
| 8609d1b5 KC |
74 | MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>"); |
| 75 | MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables"); |