arch/x86/kernel/kdebugfs.c

   1 /*
   2  * Architecture specific debugfs files
   3  *
   4  * Copyright (C) 2007, Intel Corp.
   5  *      Huang Ying <ying.huang@intel.com>
   6  *
   7  * This file is released under the GPLv2.
   8  */
   9
  10 #include <linux/debugfs.h>
  11 #include <linux/stat.h>
  12 #include <linux/init.h>
  13
  14 #include <asm/setup.h>
  15
  16 #ifdef CONFIG_DEBUG_BOOT_PARAMS
  17 static struct debugfs_blob_wrapper boot_params_blob = {
  18         .data = &boot_params,
  19         .size = sizeof(boot_params),
  20 };
  21
  22 static int __init boot_params_kdebugfs_init(void)
  23 {
  24         int error;
  25         struct dentry *dbp, *version, *data;
  26
  27         dbp = debugfs_create_dir("boot_params", NULL);
  28         if (!dbp) {
  29                 error = -ENOMEM;
  30                 goto err_return;
  31         }
  32         version = debugfs_create_x16("version", S_IRUGO, dbp,
  33                                      &boot_params.hdr.version);
  34         if (!version) {
  35                 error = -ENOMEM;
  36                 goto err_dir;
  37         }
  38         data = debugfs_create_blob("data", S_IRUGO, dbp,
  39                                    &boot_params_blob);
  40         if (!data) {
  41                 error = -ENOMEM;
  42                 goto err_version;
  43         }
  44         return 0;
  45 err_version:
  46         debugfs_remove(version);
  47 err_dir:
  48         debugfs_remove(dbp);
  49 err_return:
  50         return error;
  51 }
  52 #endif
  53
  54 static int __init arch_kdebugfs_init(void)
  55 {
  56         int error = 0;
  57
  58 #ifdef CONFIG_DEBUG_BOOT_PARAMS
  59         error = boot_params_kdebugfs_init();
  60 #endif
  61
  62         return error;
  63 }
  64
  65 arch_initcall(arch_kdebugfs_init);