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Linux/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
236

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