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1 // SPDX-License-Identifier: GPL-2.0
3 * debugfs.h - a tiny little debug file system
5 * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
6 * Copyright (C) 2004 IBM Inc.
8 * debugfs is for people to use instead of /proc or /sys.
9 * See Documentation/filesystems/ for more details.
16 #include <linux/seq_file.h>
18 #include <linux/types.h>
19 #include <linux/compiler.h>
22 struct file_operations
;
24 struct debugfs_blob_wrapper
{
29 struct debugfs_reg32
{
34 struct debugfs_regset32
{
35 const struct debugfs_reg32
*regs
;
38 struct device
*dev
; /* Optional device for Runtime PM */
41 struct debugfs_u32_array
{
46 extern struct dentry
*arch_debugfs_dir
;
48 #define DEFINE_DEBUGFS_ATTRIBUTE(__fops, __get, __set, __fmt) \
49 static int __fops ## _open(struct inode *inode, struct file *file) \
51 __simple_attr_check_format(__fmt, 0ull); \
52 return simple_attr_open(inode, file, __get, __set, __fmt); \
54 static const struct file_operations __fops = { \
55 .owner = THIS_MODULE, \
56 .open = __fops ## _open, \
57 .release = simple_attr_release, \
58 .read = debugfs_attr_read, \
59 .write = debugfs_attr_write, \
60 .llseek = no_llseek, \
63 typedef struct vfsmount
*(*debugfs_automount_t
)(struct dentry
*, void *);
65 #if defined(CONFIG_DEBUG_FS)
67 struct dentry
*debugfs_lookup(const char *name
, struct dentry
*parent
);
69 struct dentry
*debugfs_create_file(const char *name
, umode_t mode
,
70 struct dentry
*parent
, void *data
,
71 const struct file_operations
*fops
);
72 struct dentry
*debugfs_create_file_unsafe(const char *name
, umode_t mode
,
73 struct dentry
*parent
, void *data
,
74 const struct file_operations
*fops
);
76 void debugfs_create_file_size(const char *name
, umode_t mode
,
77 struct dentry
*parent
, void *data
,
78 const struct file_operations
*fops
,
81 struct dentry
*debugfs_create_dir(const char *name
, struct dentry
*parent
);
83 struct dentry
*debugfs_create_symlink(const char *name
, struct dentry
*parent
,
86 struct dentry
*debugfs_create_automount(const char *name
,
87 struct dentry
*parent
,
88 debugfs_automount_t f
,
91 void debugfs_remove(struct dentry
*dentry
);
92 #define debugfs_remove_recursive debugfs_remove
94 const struct file_operations
*debugfs_real_fops(const struct file
*filp
);
96 int debugfs_file_get(struct dentry
*dentry
);
97 void debugfs_file_put(struct dentry
*dentry
);
99 ssize_t
debugfs_attr_read(struct file
*file
, char __user
*buf
,
100 size_t len
, loff_t
*ppos
);
101 ssize_t
debugfs_attr_write(struct file
*file
, const char __user
*buf
,
102 size_t len
, loff_t
*ppos
);
104 struct dentry
*debugfs_rename(struct dentry
*old_dir
, struct dentry
*old_dentry
,
105 struct dentry
*new_dir
, const char *new_name
);
107 void debugfs_create_u8(const char *name
, umode_t mode
, struct dentry
*parent
,
109 void debugfs_create_u16(const char *name
, umode_t mode
, struct dentry
*parent
,
111 void debugfs_create_u32(const char *name
, umode_t mode
, struct dentry
*parent
,
113 void debugfs_create_u64(const char *name
, umode_t mode
, struct dentry
*parent
,
115 struct dentry
*debugfs_create_ulong(const char *name
, umode_t mode
,
116 struct dentry
*parent
, unsigned long *value
);
117 void debugfs_create_x8(const char *name
, umode_t mode
, struct dentry
*parent
,
119 void debugfs_create_x16(const char *name
, umode_t mode
, struct dentry
*parent
,
121 void debugfs_create_x32(const char *name
, umode_t mode
, struct dentry
*parent
,
123 void debugfs_create_x64(const char *name
, umode_t mode
, struct dentry
*parent
,
125 void debugfs_create_size_t(const char *name
, umode_t mode
,
126 struct dentry
*parent
, size_t *value
);
127 void debugfs_create_atomic_t(const char *name
, umode_t mode
,
128 struct dentry
*parent
, atomic_t
*value
);
129 struct dentry
*debugfs_create_bool(const char *name
, umode_t mode
,
130 struct dentry
*parent
, bool *value
);
131 void debugfs_create_str(const char *name
, umode_t mode
,
132 struct dentry
*parent
, char **value
);
134 struct dentry
*debugfs_create_blob(const char *name
, umode_t mode
,
135 struct dentry
*parent
,
136 struct debugfs_blob_wrapper
*blob
);
138 void debugfs_create_regset32(const char *name
, umode_t mode
,
139 struct dentry
*parent
,
140 struct debugfs_regset32
*regset
);
142 void debugfs_print_regs32(struct seq_file
*s
, const struct debugfs_reg32
*regs
,
143 int nregs
, void __iomem
*base
, char *prefix
);
145 void debugfs_create_u32_array(const char *name
, umode_t mode
,
146 struct dentry
*parent
,
147 struct debugfs_u32_array
*array
);
149 void debugfs_create_devm_seqfile(struct device
*dev
, const char *name
,
150 struct dentry
*parent
,
151 int (*read_fn
)(struct seq_file
*s
, void *data
));
153 bool debugfs_initialized(void);
155 ssize_t
debugfs_read_file_bool(struct file
*file
, char __user
*user_buf
,
156 size_t count
, loff_t
*ppos
);
158 ssize_t
debugfs_write_file_bool(struct file
*file
, const char __user
*user_buf
,
159 size_t count
, loff_t
*ppos
);
161 ssize_t
debugfs_read_file_str(struct file
*file
, char __user
*user_buf
,
162 size_t count
, loff_t
*ppos
);
166 #include <linux/err.h>
169 * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
170 * so users have a chance to detect if there was a real error or not. We don't
171 * want to duplicate the design decision mistakes of procfs and devfs again.
174 static inline struct dentry
*debugfs_lookup(const char *name
,
175 struct dentry
*parent
)
177 return ERR_PTR(-ENODEV
);
180 static inline struct dentry
*debugfs_create_file(const char *name
, umode_t mode
,
181 struct dentry
*parent
, void *data
,
182 const struct file_operations
*fops
)
184 return ERR_PTR(-ENODEV
);
187 static inline struct dentry
*debugfs_create_file_unsafe(const char *name
,
188 umode_t mode
, struct dentry
*parent
,
190 const struct file_operations
*fops
)
192 return ERR_PTR(-ENODEV
);
195 static inline void debugfs_create_file_size(const char *name
, umode_t mode
,
196 struct dentry
*parent
, void *data
,
197 const struct file_operations
*fops
,
201 static inline struct dentry
*debugfs_create_dir(const char *name
,
202 struct dentry
*parent
)
204 return ERR_PTR(-ENODEV
);
207 static inline struct dentry
*debugfs_create_symlink(const char *name
,
208 struct dentry
*parent
,
211 return ERR_PTR(-ENODEV
);
214 static inline struct dentry
*debugfs_create_automount(const char *name
,
215 struct dentry
*parent
,
216 debugfs_automount_t f
,
219 return ERR_PTR(-ENODEV
);
222 static inline void debugfs_remove(struct dentry
*dentry
)
225 static inline void debugfs_remove_recursive(struct dentry
*dentry
)
228 const struct file_operations
*debugfs_real_fops(const struct file
*filp
);
230 static inline int debugfs_file_get(struct dentry
*dentry
)
235 static inline void debugfs_file_put(struct dentry
*dentry
)
238 static inline ssize_t
debugfs_attr_read(struct file
*file
, char __user
*buf
,
239 size_t len
, loff_t
*ppos
)
244 static inline ssize_t
debugfs_attr_write(struct file
*file
,
245 const char __user
*buf
,
246 size_t len
, loff_t
*ppos
)
251 static inline struct dentry
*debugfs_rename(struct dentry
*old_dir
, struct dentry
*old_dentry
,
252 struct dentry
*new_dir
, char *new_name
)
254 return ERR_PTR(-ENODEV
);
257 static inline void debugfs_create_u8(const char *name
, umode_t mode
,
258 struct dentry
*parent
, u8
*value
) { }
260 static inline void debugfs_create_u16(const char *name
, umode_t mode
,
261 struct dentry
*parent
, u16
*value
) { }
263 static inline void debugfs_create_u32(const char *name
, umode_t mode
,
264 struct dentry
*parent
, u32
*value
) { }
266 static inline void debugfs_create_u64(const char *name
, umode_t mode
,
267 struct dentry
*parent
, u64
*value
) { }
269 static inline struct dentry
*debugfs_create_ulong(const char *name
,
271 struct dentry
*parent
,
272 unsigned long *value
)
274 return ERR_PTR(-ENODEV
);
277 static inline void debugfs_create_x8(const char *name
, umode_t mode
,
278 struct dentry
*parent
, u8
*value
) { }
280 static inline void debugfs_create_x16(const char *name
, umode_t mode
,
281 struct dentry
*parent
, u16
*value
) { }
283 static inline void debugfs_create_x32(const char *name
, umode_t mode
,
284 struct dentry
*parent
, u32
*value
) { }
286 static inline void debugfs_create_x64(const char *name
, umode_t mode
,
287 struct dentry
*parent
, u64
*value
) { }
289 static inline void debugfs_create_size_t(const char *name
, umode_t mode
,
290 struct dentry
*parent
, size_t *value
)
293 static inline void debugfs_create_atomic_t(const char *name
, umode_t mode
,
294 struct dentry
*parent
,
298 static inline struct dentry
*debugfs_create_bool(const char *name
, umode_t mode
,
299 struct dentry
*parent
,
302 return ERR_PTR(-ENODEV
);
305 static inline void debugfs_create_str(const char *name
, umode_t mode
,
306 struct dentry
*parent
,
310 static inline struct dentry
*debugfs_create_blob(const char *name
, umode_t mode
,
311 struct dentry
*parent
,
312 struct debugfs_blob_wrapper
*blob
)
314 return ERR_PTR(-ENODEV
);
317 static inline void debugfs_create_regset32(const char *name
, umode_t mode
,
318 struct dentry
*parent
,
319 struct debugfs_regset32
*regset
)
323 static inline void debugfs_print_regs32(struct seq_file
*s
, const struct debugfs_reg32
*regs
,
324 int nregs
, void __iomem
*base
, char *prefix
)
328 static inline bool debugfs_initialized(void)
333 static inline void debugfs_create_u32_array(const char *name
, umode_t mode
,
334 struct dentry
*parent
,
335 struct debugfs_u32_array
*array
)
339 static inline void debugfs_create_devm_seqfile(struct device
*dev
,
341 struct dentry
*parent
,
342 int (*read_fn
)(struct seq_file
*s
,
347 static inline ssize_t
debugfs_read_file_bool(struct file
*file
,
348 char __user
*user_buf
,
349 size_t count
, loff_t
*ppos
)
354 static inline ssize_t
debugfs_write_file_bool(struct file
*file
,
355 const char __user
*user_buf
,
356 size_t count
, loff_t
*ppos
)
361 static inline ssize_t
debugfs_read_file_str(struct file
*file
,
362 char __user
*user_buf
,
363 size_t count
, loff_t
*ppos
)
371 * debugfs_create_xul - create a debugfs file that is used to read and write an
372 * unsigned long value, formatted in hexadecimal
373 * @name: a pointer to a string containing the name of the file to create.
374 * @mode: the permission that the file should have
375 * @parent: a pointer to the parent dentry for this file. This should be a
376 * directory dentry if set. If this parameter is %NULL, then the
377 * file will be created in the root of the debugfs filesystem.
378 * @value: a pointer to the variable that the file should read to and write
381 static inline void debugfs_create_xul(const char *name
, umode_t mode
,
382 struct dentry
*parent
,
383 unsigned long *value
)
385 if (sizeof(*value
) == sizeof(u32
))
386 debugfs_create_x32(name
, mode
, parent
, (u32
*)value
);
388 debugfs_create_x64(name
, mode
, parent
, (u64
*)value
);