Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <linux/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/pgtable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) static int ptdump_show(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	ptdump_walk_pgd_level_debugfs(m, &init_mm, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) DEFINE_SHOW_ATTRIBUTE(ptdump);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static int ptdump_curknl_show(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	if (current->mm->pgd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 		ptdump_walk_pgd_level_debugfs(m, current->mm, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) DEFINE_SHOW_ATTRIBUTE(ptdump_curknl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #ifdef CONFIG_PAGE_TABLE_ISOLATION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static int ptdump_curusr_show(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	if (current->mm->pgd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		ptdump_walk_pgd_level_debugfs(m, current->mm, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) DEFINE_SHOW_ATTRIBUTE(ptdump_curusr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static int ptdump_efi_show(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	if (efi_mm.pgd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		ptdump_walk_pgd_level_debugfs(m, &efi_mm, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) DEFINE_SHOW_ATTRIBUTE(ptdump_efi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static struct dentry *dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static int __init pt_dump_debug_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	dir = debugfs_create_dir("page_tables", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	debugfs_create_file("kernel", 0400, dir, NULL, &ptdump_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	debugfs_create_file("current_kernel", 0400, dir, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 			    &ptdump_curknl_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #ifdef CONFIG_PAGE_TABLE_ISOLATION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	debugfs_create_file("current_user", 0400, dir, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 			    &ptdump_curusr_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	debugfs_create_file("efi", 0400, dir, NULL, &ptdump_efi_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static void __exit pt_dump_debug_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	debugfs_remove_recursive(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) module_init(pt_dump_debug_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) module_exit(pt_dump_debug_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables");