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         const 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, umode_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 struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
  97                                         struct dentry *parent,
  98                                         u32 *array, u32 elements);
  99
 100 bool debugfs_initialized(void);
 101
 102 #else
 103
 104 #include <linux/err.h>
 105
 106 /*
 107  * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
 108  * so users have a chance to detect if there was a real error or not.  We don't
 109  * want to duplicate the design decision mistakes of procfs and devfs again.
 110  */
 111
 112 static inline struct dentry *debugfs_create_file(const char *name, umode_t mode,
 113                                         struct dentry *parent, void *data,
 114                                         const struct file_operations *fops)
 115 {
 116         return ERR_PTR(-ENODEV);
 117 }
 118
 119 static inline struct dentry *debugfs_create_dir(const char *name,
 120                                                 struct dentry *parent)
 121 {
 122         return ERR_PTR(-ENODEV);
 123 }
 124
 125 static inline struct dentry *debugfs_create_symlink(const char *name,
 126                                                     struct dentry *parent,
 127                                                     const char *dest)
 128 {
 129         return ERR_PTR(-ENODEV);
 130 }
 131
 132 static inline void debugfs_remove(struct dentry *dentry)
 133 { }
 134
 135 static inline void debugfs_remove_recursive(struct dentry *dentry)
 136 { }
 137
 138 static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
 139                 struct dentry *new_dir, char *new_name)
 140 {
 141         return ERR_PTR(-ENODEV);
 142 }
 143
 144 static inline struct dentry *debugfs_create_u8(const char *name, umode_t mode,
 145                                                struct dentry *parent,
 146                                                u8 *value)
 147 {
 148         return ERR_PTR(-ENODEV);
 149 }
 150
 151 static inline struct dentry *debugfs_create_u16(const char *name, umode_t mode,
 152                                                 struct dentry *parent,
 153                                                 u16 *value)
 154 {
 155         return ERR_PTR(-ENODEV);
 156 }
 157
 158 static inline struct dentry *debugfs_create_u32(const char *name, umode_t mode,
 159                                                 struct dentry *parent,
 160                                                 u32 *value)
 161 {
 162         return ERR_PTR(-ENODEV);
 163 }
 164
 165 static inline struct dentry *debugfs_create_u64(const char *name, umode_t mode,
 166                                                 struct dentry *parent,
 167                                                 u64 *value)
 168 {
 169         return ERR_PTR(-ENODEV);
 170 }
 171
 172 static inline struct dentry *debugfs_create_x8(const char *name, umode_t mode,
 173                                                struct dentry *parent,
 174                                                u8 *value)
 175 {
 176         return ERR_PTR(-ENODEV);
 177 }
 178
 179 static inline struct dentry *debugfs_create_x16(const char *name, umode_t mode,
 180                                                 struct dentry *parent,
 181                                                 u16 *value)
 182 {
 183         return ERR_PTR(-ENODEV);
 184 }
 185
 186 static inline struct dentry *debugfs_create_x32(const char *name, umode_t mode,
 187                                                 struct dentry *parent,
 188                                                 u32 *value)
 189 {
 190         return ERR_PTR(-ENODEV);
 191 }
 192
 193 static inline struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
 194                                      struct dentry *parent,
 195                                      size_t *value)
 196 {
 197         return ERR_PTR(-ENODEV);
 198 }
 199
 200 static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode,
 201                                                  struct dentry *parent,
 202                                                  u32 *value)
 203 {
 204         return ERR_PTR(-ENODEV);
 205 }
 206
 207 static inline struct dentry *debugfs_create_blob(const char *name, umode_t mode,
 208                                   struct dentry *parent,
 209                                   struct debugfs_blob_wrapper *blob)
 210 {
 211         return ERR_PTR(-ENODEV);
 212 }
 213
 214 static inline struct dentry *debugfs_create_regset32(const char *name,
 215                                    umode_t mode, struct dentry *parent,
 216                                    struct debugfs_regset32 *regset)
 217 {
 218         return ERR_PTR(-ENODEV);
 219 }
 220
 221 static inline bool debugfs_initialized(void)
 222 {
 223         return false;
 224 }
 225
 226 static inline struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
 227                                         struct dentry *parent,
 228                                         u32 *array, u32 elements)
 229 {
 230         return ERR_PTR(-ENODEV);
 231 }
 232
 233 #endif
 234
 235 #endif