include/linux/debugfs.h

   1 /*
   2  *  debugfs.h - a tiny little debug file system
   3  *
   4  *  Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
   5  *  Copyright (C) 2004 IBM Inc.
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License version
   9  *      2 as published by the Free Software Foundation.
  10  *
  11  *  debugfs is for people to use instead of /proc or /sys.
  12  *  See Documentation/DocBook/filesystems for more details.
  13  */
  14
  15 #ifndef _DEBUGFS_H_
  16 #define _DEBUGFS_H_
  17
  18 #include <linux/fs.h>
  19 #include <linux/seq_file.h>
  20
  21 #include <linux/types.h>
  22
  23 struct file_operations;
  24
  25 struct debugfs_blob_wrapper {
  26         void *data;
  27         unsigned long size;
  28 };
  29
  30 struct debugfs_reg32 {
  31         char *name;
  32         unsigned long offset;
  33 };
  34
  35 struct debugfs_regset32 {
  36         struct debugfs_reg32 *regs;
  37         int nregs;
  38         void __iomem *base;
  39 };
  40
  41 extern struct dentry *arch_debugfs_dir;
  42
  43 #if defined(CONFIG_DEBUG_FS)
  44
  45 /* declared over in file.c */
  46 extern const struct file_operations debugfs_file_operations;
  47 extern const struct inode_operations debugfs_link_operations;
  48
  49 struct dentry *debugfs_create_file(const char *name, umode_t mode,
  50                                    struct dentry *parent, void *data,
  51                                    const struct file_operations *fops);
  52
  53 struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
  54
  55 struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
  56                                       const char *dest);
  57
  58 void debugfs_remove(struct dentry *dentry);
  59 void debugfs_remove_recursive(struct dentry *dentry);
  60
  61 struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
  62                 struct dentry *new_dir, const char *new_name);
  63
  64 struct dentry *debugfs_create_u8(const char *name, umode_t mode,
  65                                  struct dentry *parent, u8 *value);
  66 struct dentry *debugfs_create_u16(const char *name, umode_t mode,
  67                                   struct dentry *parent, u16 *value);
  68 struct dentry *debugfs_create_u32(const char *name, umode_t mode,
  69                                   struct dentry *parent, u32 *value);
  70 struct dentry *debugfs_create_u64(const char *name, umode_t mode,
  71                                   struct dentry *parent, u64 *value);
  72 struct dentry *debugfs_create_x8(const char *name, umode_t mode,
  73                                  struct dentry *parent, u8 *value);
  74 struct dentry *debugfs_create_x16(const char *name, umode_t mode,
  75                                   struct dentry *parent, u16 *value);
  76 struct dentry *debugfs_create_x32(const char *name, umode_t mode,
  77                                   struct dentry *parent, u32 *value);
  78 struct dentry *debugfs_create_x64(const char *name, umode_t mode,
  79                                   struct dentry *parent, u64 *value);
  80 struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
  81                                      struct dentry *parent, size_t *value);
  82 struct dentry *debugfs_create_bool(const char *name, umode_t mode,
  83                                   struct dentry *parent, u32 *value);
  84
  85 struct dentry *debugfs_create_blob(const char *name, umode_t mode,
  86                                   struct dentry *parent,
  87                                   struct debugfs_blob_wrapper *blob);
  88
  89 struct dentry *debugfs_create_regset32(const char *name, mode_t mode,
  90                                      struct dentry *parent,
  91                                      struct debugfs_regset32 *regset);
  92
  93 int debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
  94                          int nregs, void __iomem *base, char *prefix);
  95
  96 bool debugfs_initialized(void);
  97
  98 #else
  99
 100 #include <linux/err.h>
 101
 102 /*
 103  * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
 104  * so users have a chance to detect if there was a real error or not.  We don't
 105  * want to duplicate the design decision mistakes of procfs and devfs again.
 106  */
 107
 108 static inline struct dentry *debugfs_create_file(const char *name, umode_t mode,
 109                                         struct dentry *parent, void *data,
 110                                         const struct file_operations *fops)
 111 {
 112         return ERR_PTR(-ENODEV);
 113 }
 114
 115 static inline struct dentry *debugfs_create_dir(const char *name,
 116                                                 struct dentry *parent)
 117 {
 118         return ERR_PTR(-ENODEV);
 119 }
 120
 121 static inline struct dentry *debugfs_create_symlink(const char *name,
 122                                                     struct dentry *parent,
 123                                                     const char *dest)
 124 {
 125         return ERR_PTR(-ENODEV);
 126 }
 127
 128 static inline void debugfs_remove(struct dentry *dentry)
 129 { }
 130
 131 static inline void debugfs_remove_recursive(struct dentry *dentry)
 132 { }
 133
 134 static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
 135                 struct dentry *new_dir, char *new_name)
 136 {
 137         return ERR_PTR(-ENODEV);
 138 }
 139
 140 static inline struct dentry *debugfs_create_u8(const char *name, umode_t mode,
 141                                                struct dentry *parent,
 142                                                u8 *value)
 143 {
 144         return ERR_PTR(-ENODEV);
 145 }
 146
 147 static inline struct dentry *debugfs_create_u16(const char *name, umode_t mode,
 148                                                 struct dentry *parent,
 149                                                 u16 *value)
 150 {
 151         return ERR_PTR(-ENODEV);
 152 }
 153
 154 static inline struct dentry *debugfs_create_u32(const char *name, umode_t mode,
 155                                                 struct dentry *parent,
 156                                                 u32 *value)
 157 {
 158         return ERR_PTR(-ENODEV);
 159 }
 160
 161 static inline struct dentry *debugfs_create_u64(const char *name, umode_t mode,
 162                                                 struct dentry *parent,
 163                                                 u64 *value)
 164 {
 165         return ERR_PTR(-ENODEV);
 166 }
 167
 168 static inline struct dentry *debugfs_create_x8(const char *name, umode_t mode,
 169                                                struct dentry *parent,
 170                                                u8 *value)
 171 {
 172         return ERR_PTR(-ENODEV);
 173 }
 174
 175 static inline struct dentry *debugfs_create_x16(const char *name, umode_t mode,
 176                                                 struct dentry *parent,
 177                                                 u16 *value)
 178 {
 179         return ERR_PTR(-ENODEV);
 180 }
 181
 182 static inline struct dentry *debugfs_create_x32(const char *name, umode_t mode,
 183                                                 struct dentry *parent,
 184                                                 u32 *value)
 185 {
 186         return ERR_PTR(-ENODEV);
 187 }
 188
 189 static inline struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
 190                                      struct dentry *parent,
 191                                      size_t *value)
 192 {
 193         return ERR_PTR(-ENODEV);
 194 }
 195
 196 static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode,
 197                                                  struct dentry *parent,
 198                                                  u32 *value)
 199 {
 200         return ERR_PTR(-ENODEV);
 201 }
 202
 203 static inline struct dentry *debugfs_create_blob(const char *name, umode_t mode,
 204                                   struct dentry *parent,
 205                                   struct debugfs_blob_wrapper *blob)
 206 {
 207         return ERR_PTR(-ENODEV);
 208 }
 209
 210 static inline struct dentry *debugfs_create_regset32(const char *name,
 211                                    mode_t mode, struct dentry *parent,
 212                                    struct debugfs_regset32 *regset)
 213 {
 214         return ERR_PTR(-ENODEV);
 215 }
 216
 217 static inline bool debugfs_initialized(void)
 218 {
 219         return false;
 220 }
 221
 222 #endif
 223
 224 #endif