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 device;
  24 struct file_operations;
  25
  26 struct debugfs_blob_wrapper {
  27         void *data;
  28         unsigned long size;
  29 };
  30
  31 struct debugfs_reg32 {
  32         char *name;
  33         unsigned long offset;
  34 };
  35
  36 struct debugfs_regset32 {
  37         const struct debugfs_reg32 *regs;
  38         int nregs;
  39         void __iomem *base;
  40 };
  41
  42 extern struct dentry *arch_debugfs_dir;
  43
  44 #if defined(CONFIG_DEBUG_FS)
  45
  46 /* declared over in file.c */
  47 extern const struct file_operations debugfs_file_operations;
  48 extern const struct inode_operations debugfs_link_operations;
  49
  50 struct dentry *debugfs_create_file(const char *name, umode_t mode,
  51                                    struct dentry *parent, void *data,
  52                                    const struct file_operations *fops);
  53
  54 struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
  55
  56 struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
  57                                       const char *dest);
  58
  59 void debugfs_remove(struct dentry *dentry);
  60 void debugfs_remove_recursive(struct dentry *dentry);
  61
  62 struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
  63                 struct dentry *new_dir, const char *new_name);
  64
  65 struct dentry *debugfs_create_u8(const char *name, umode_t mode,
  66                                  struct dentry *parent, u8 *value);
  67 struct dentry *debugfs_create_u16(const char *name, umode_t mode,
  68                                   struct dentry *parent, u16 *value);
  69 struct dentry *debugfs_create_u32(const char *name, umode_t mode,
  70                                   struct dentry *parent, u32 *value);
  71 struct dentry *debugfs_create_u64(const char *name, umode_t mode,
  72                                   struct dentry *parent, u64 *value);
  73 struct dentry *debugfs_create_x8(const char *name, umode_t mode,
  74                                  struct dentry *parent, u8 *value);
  75 struct dentry *debugfs_create_x16(const char *name, umode_t mode,
  76                                   struct dentry *parent, u16 *value);
  77 struct dentry *debugfs_create_x32(const char *name, umode_t mode,
  78                                   struct dentry *parent, u32 *value);
  79 struct dentry *debugfs_create_x64(const char *name, umode_t mode,
  80                                   struct dentry *parent, u64 *value);
  81 struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
  82                                      struct dentry *parent, size_t *value);
  83 struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
  84                                      struct dentry *parent, atomic_t *value);
  85 struct dentry *debugfs_create_bool(const char *name, umode_t mode,
  86                                   struct dentry *parent, u32 *value);
  87
  88 struct dentry *debugfs_create_blob(const char *name, umode_t mode,
  89                                   struct dentry *parent,
  90                                   struct debugfs_blob_wrapper *blob);
  91
  92 struct dentry *debugfs_create_regset32(const char *name, umode_t mode,
  93                                      struct dentry *parent,
  94                                      struct debugfs_regset32 *regset);
  95
  96 void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
  97                           int nregs, void __iomem *base, char *prefix);
  98
  99 struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
 100                                         struct dentry *parent,
 101                                         u32 *array, u32 elements);
 102
 103 struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name,
 104                                            struct dentry *parent,
 105                                            int (*read_fn)(struct seq_file *s,
 106                                                           void *data));
 107
 108 bool debugfs_initialized(void);
 109
 110 #else
 111
 112 #include <linux/err.h>
 113
 114 /*
 115  * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
 116  * so users have a chance to detect if there was a real error or not.  We don't
 117  * want to duplicate the design decision mistakes of procfs and devfs again.
 118  */
 119
 120 static inline struct dentry *debugfs_create_file(const char *name, umode_t mode,
 121                                         struct dentry *parent, void *data,
 122                                         const struct file_operations *fops)
 123 {
 124         return ERR_PTR(-ENODEV);
 125 }
 126
 127 static inline struct dentry *debugfs_create_dir(const char *name,
 128                                                 struct dentry *parent)
 129 {
 130         return ERR_PTR(-ENODEV);
 131 }
 132
 133 static inline struct dentry *debugfs_create_symlink(const char *name,
 134                                                     struct dentry *parent,
 135                                                     const char *dest)
 136 {
 137         return ERR_PTR(-ENODEV);
 138 }
 139
 140 static inline void debugfs_remove(struct dentry *dentry)
 141 { }
 142
 143 static inline void debugfs_remove_recursive(struct dentry *dentry)
 144 { }
 145
 146 static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
 147                 struct dentry *new_dir, char *new_name)
 148 {
 149         return ERR_PTR(-ENODEV);
 150 }
 151
 152 static inline struct dentry *debugfs_create_u8(const char *name, umode_t mode,
 153                                                struct dentry *parent,
 154                                                u8 *value)
 155 {
 156         return ERR_PTR(-ENODEV);
 157 }
 158
 159 static inline struct dentry *debugfs_create_u16(const char *name, umode_t mode,
 160                                                 struct dentry *parent,
 161                                                 u16 *value)
 162 {
 163         return ERR_PTR(-ENODEV);
 164 }
 165
 166 static inline struct dentry *debugfs_create_u32(const char *name, umode_t mode,
 167                                                 struct dentry *parent,
 168                                                 u32 *value)
 169 {
 170         return ERR_PTR(-ENODEV);
 171 }
 172
 173 static inline struct dentry *debugfs_create_u64(const char *name, umode_t mode,
 174                                                 struct dentry *parent,
 175                                                 u64 *value)
 176 {
 177         return ERR_PTR(-ENODEV);
 178 }
 179
 180 static inline struct dentry *debugfs_create_x8(const char *name, umode_t mode,
 181                                                struct dentry *parent,
 182                                                u8 *value)
 183 {
 184         return ERR_PTR(-ENODEV);
 185 }
 186
 187 static inline struct dentry *debugfs_create_x16(const char *name, umode_t mode,
 188                                                 struct dentry *parent,
 189                                                 u16 *value)
 190 {
 191         return ERR_PTR(-ENODEV);
 192 }
 193
 194 static inline struct dentry *debugfs_create_x32(const char *name, umode_t mode,
 195                                                 struct dentry *parent,
 196                                                 u32 *value)
 197 {
 198         return ERR_PTR(-ENODEV);
 199 }
 200
 201 static inline struct dentry *debugfs_create_x64(const char *name, umode_t mode,
 202                                                 struct dentry *parent,
 203                                                 u64 *value)
 204 {
 205         return ERR_PTR(-ENODEV);
 206 }
 207
 208 static inline struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
 209                                      struct dentry *parent,
 210                                      size_t *value)
 211 {
 212         return ERR_PTR(-ENODEV);
 213 }
 214
 215 static inline struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
 216                                      struct dentry *parent, atomic_t *value)
 217 {
 218         return ERR_PTR(-ENODEV);
 219 }
 220
 221 static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode,
 222                                                  struct dentry *parent,
 223                                                  u32 *value)
 224 {
 225         return ERR_PTR(-ENODEV);
 226 }
 227
 228 static inline struct dentry *debugfs_create_blob(const char *name, umode_t mode,
 229                                   struct dentry *parent,
 230                                   struct debugfs_blob_wrapper *blob)
 231 {
 232         return ERR_PTR(-ENODEV);
 233 }
 234
 235 static inline struct dentry *debugfs_create_regset32(const char *name,
 236                                    umode_t mode, struct dentry *parent,
 237                                    struct debugfs_regset32 *regset)
 238 {
 239         return ERR_PTR(-ENODEV);
 240 }
 241
 242 static inline void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
 243                          int nregs, void __iomem *base, char *prefix)
 244 {
 245 }
 246
 247 static inline bool debugfs_initialized(void)
 248 {
 249         return false;
 250 }
 251
 252 static inline struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
 253                                         struct dentry *parent,
 254                                         u32 *array, u32 elements)
 255 {
 256         return ERR_PTR(-ENODEV);
 257 }
 258
 259 static inline struct dentry *debugfs_create_devm_seqfile(struct device *dev,
 260                                                          const char *name,
 261                                                          struct dentry *parent,
 262                                            int (*read_fn)(struct seq_file *s,
 263                                                           void *data))
 264 {
 265         return ERR_PTR(-ENODEV);
 266 }
 267
 268 #endif
 269
 270 #endif