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
  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_file_size(const char *name, umode_t mode,
  54                                         struct dentry *parent, void *data,
  55                                         const struct file_operations *fops,
  56                                         loff_t file_size);
  57
  58 struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
  59
  60 struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
  61                                       const char *dest);
  62
  63 struct dentry *debugfs_create_automount(const char *name,
  64                                         struct dentry *parent,
  65                                         struct vfsmount *(*f)(void *),
  66                                         void *data);
  67
  68 void debugfs_remove(struct dentry *dentry);
  69 void debugfs_remove_recursive(struct dentry *dentry);
  70
  71 struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
  72                 struct dentry *new_dir, const char *new_name);
  73
  74 struct dentry *debugfs_create_u8(const char *name, umode_t mode,
  75                                  struct dentry *parent, u8 *value);
  76 struct dentry *debugfs_create_u16(const char *name, umode_t mode,
  77                                   struct dentry *parent, u16 *value);
  78 struct dentry *debugfs_create_u32(const char *name, umode_t mode,
  79                                   struct dentry *parent, u32 *value);
  80 struct dentry *debugfs_create_u64(const char *name, umode_t mode,
  81                                   struct dentry *parent, u64 *value);
  82 struct dentry *debugfs_create_ulong(const char *name, umode_t mode,
  83                                     struct dentry *parent, unsigned long *value);
  84 struct dentry *debugfs_create_x8(const char *name, umode_t mode,
  85                                  struct dentry *parent, u8 *value);
  86 struct dentry *debugfs_create_x16(const char *name, umode_t mode,
  87                                   struct dentry *parent, u16 *value);
  88 struct dentry *debugfs_create_x32(const char *name, umode_t mode,
  89                                   struct dentry *parent, u32 *value);
  90 struct dentry *debugfs_create_x64(const char *name, umode_t mode,
  91                                   struct dentry *parent, u64 *value);
  92 struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
  93                                      struct dentry *parent, size_t *value);
  94 struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
  95                                      struct dentry *parent, atomic_t *value);
  96 struct dentry *debugfs_create_bool(const char *name, umode_t mode,
  97                                   struct dentry *parent, bool *value);
  98
  99 struct dentry *debugfs_create_blob(const char *name, umode_t mode,
 100                                   struct dentry *parent,
 101                                   struct debugfs_blob_wrapper *blob);
 102
 103 struct dentry *debugfs_create_regset32(const char *name, umode_t mode,
 104                                      struct dentry *parent,
 105                                      struct debugfs_regset32 *regset);
 106
 107 void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
 108                           int nregs, void __iomem *base, char *prefix);
 109
 110 struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
 111                                         struct dentry *parent,
 112                                         u32 *array, u32 elements);
 113
 114 struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name,
 115                                            struct dentry *parent,
 116                                            int (*read_fn)(struct seq_file *s,
 117                                                           void *data));
 118
 119 bool debugfs_initialized(void);
 120
 121 ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
 122                                size_t count, loff_t *ppos);
 123
 124 ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
 125                                 size_t count, loff_t *ppos);
 126
 127 #else
 128
 129 #include <linux/err.h>
 130
 131 /*
 132  * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
 133  * so users have a chance to detect if there was a real error or not.  We don't
 134  * want to duplicate the design decision mistakes of procfs and devfs again.
 135  */
 136
 137 static inline struct dentry *debugfs_create_file(const char *name, umode_t mode,
 138                                         struct dentry *parent, void *data,
 139                                         const struct file_operations *fops)
 140 {
 141         return ERR_PTR(-ENODEV);
 142 }
 143
 144 static inline struct dentry *debugfs_create_file_size(const char *name, umode_t mode,
 145                                         struct dentry *parent, void *data,
 146                                         const struct file_operations *fops,
 147                                         loff_t file_size)
 148 {
 149         return ERR_PTR(-ENODEV);
 150 }
 151
 152 static inline struct dentry *debugfs_create_dir(const char *name,
 153                                                 struct dentry *parent)
 154 {
 155         return ERR_PTR(-ENODEV);
 156 }
 157
 158 static inline struct dentry *debugfs_create_symlink(const char *name,
 159                                                     struct dentry *parent,
 160                                                     const char *dest)
 161 {
 162         return ERR_PTR(-ENODEV);
 163 }
 164
 165 static inline struct dentry *debugfs_create_automount(const char *name,
 166                                         struct dentry *parent,
 167                                         struct vfsmount *(*f)(void *),
 168                                         void *data)
 169 {
 170         return ERR_PTR(-ENODEV);
 171 }
 172
 173 static inline void debugfs_remove(struct dentry *dentry)
 174 { }
 175
 176 static inline void debugfs_remove_recursive(struct dentry *dentry)
 177 { }
 178
 179 static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
 180                 struct dentry *new_dir, char *new_name)
 181 {
 182         return ERR_PTR(-ENODEV);
 183 }
 184
 185 static inline struct dentry *debugfs_create_u8(const char *name, umode_t mode,
 186                                                struct dentry *parent,
 187                                                u8 *value)
 188 {
 189         return ERR_PTR(-ENODEV);
 190 }
 191
 192 static inline struct dentry *debugfs_create_u16(const char *name, umode_t mode,
 193                                                 struct dentry *parent,
 194                                                 u16 *value)
 195 {
 196         return ERR_PTR(-ENODEV);
 197 }
 198
 199 static inline struct dentry *debugfs_create_u32(const char *name, umode_t mode,
 200                                                 struct dentry *parent,
 201                                                 u32 *value)
 202 {
 203         return ERR_PTR(-ENODEV);
 204 }
 205
 206 static inline struct dentry *debugfs_create_u64(const char *name, umode_t mode,
 207                                                 struct dentry *parent,
 208                                                 u64 *value)
 209 {
 210         return ERR_PTR(-ENODEV);
 211 }
 212
 213 static inline struct dentry *debugfs_create_x8(const char *name, umode_t mode,
 214                                                struct dentry *parent,
 215                                                u8 *value)
 216 {
 217         return ERR_PTR(-ENODEV);
 218 }
 219
 220 static inline struct dentry *debugfs_create_x16(const char *name, umode_t mode,
 221                                                 struct dentry *parent,
 222                                                 u16 *value)
 223 {
 224         return ERR_PTR(-ENODEV);
 225 }
 226
 227 static inline struct dentry *debugfs_create_x32(const char *name, umode_t mode,
 228                                                 struct dentry *parent,
 229                                                 u32 *value)
 230 {
 231         return ERR_PTR(-ENODEV);
 232 }
 233
 234 static inline struct dentry *debugfs_create_x64(const char *name, umode_t mode,
 235                                                 struct dentry *parent,
 236                                                 u64 *value)
 237 {
 238         return ERR_PTR(-ENODEV);
 239 }
 240
 241 static inline struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
 242                                      struct dentry *parent,
 243                                      size_t *value)
 244 {
 245         return ERR_PTR(-ENODEV);
 246 }
 247
 248 static inline struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
 249                                      struct dentry *parent, atomic_t *value)
 250 {
 251         return ERR_PTR(-ENODEV);
 252 }
 253
 254 static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode,
 255                                                  struct dentry *parent,
 256                                                  bool *value)
 257 {
 258         return ERR_PTR(-ENODEV);
 259 }
 260
 261 static inline struct dentry *debugfs_create_blob(const char *name, umode_t mode,
 262                                   struct dentry *parent,
 263                                   struct debugfs_blob_wrapper *blob)
 264 {
 265         return ERR_PTR(-ENODEV);
 266 }
 267
 268 static inline struct dentry *debugfs_create_regset32(const char *name,
 269                                    umode_t mode, struct dentry *parent,
 270                                    struct debugfs_regset32 *regset)
 271 {
 272         return ERR_PTR(-ENODEV);
 273 }
 274
 275 static inline void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
 276                          int nregs, void __iomem *base, char *prefix)
 277 {
 278 }
 279
 280 static inline bool debugfs_initialized(void)
 281 {
 282         return false;
 283 }
 284
 285 static inline struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
 286                                         struct dentry *parent,
 287                                         u32 *array, u32 elements)
 288 {
 289         return ERR_PTR(-ENODEV);
 290 }
 291
 292 static inline struct dentry *debugfs_create_devm_seqfile(struct device *dev,
 293                                                          const char *name,
 294                                                          struct dentry *parent,
 295                                            int (*read_fn)(struct seq_file *s,
 296                                                           void *data))
 297 {
 298         return ERR_PTR(-ENODEV);
 299 }
 300
 301 static inline ssize_t debugfs_read_file_bool(struct file *file,
 302                                              char __user *user_buf,
 303                                              size_t count, loff_t *ppos)
 304 {
 305         return -ENODEV;
 306 }
 307
 308 static inline ssize_t debugfs_write_file_bool(struct file *file,
 309                                               const char __user *user_buf,
 310                                               size_t count, loff_t *ppos)
 311 {
 312         return -ENODEV;
 313 }
 314
 315 #endif
 316
 317 #endif