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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 void debugfs_create_ulong(const char *name
, umode_t mode
, struct dentry
*parent
,
116 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 void debugfs_create_bool(const char *name
, umode_t mode
, struct dentry
*parent
,
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 void debugfs_create_ulong(const char *name
, umode_t mode
,
270 struct dentry
*parent
,
271 unsigned long *value
) { }
273 static inline void debugfs_create_x8(const char *name
, umode_t mode
,
274 struct dentry
*parent
, u8
*value
) { }
276 static inline void debugfs_create_x16(const char *name
, umode_t mode
,
277 struct dentry
*parent
, u16
*value
) { }
279 static inline void debugfs_create_x32(const char *name
, umode_t mode
,
280 struct dentry
*parent
, u32
*value
) { }
282 static inline void debugfs_create_x64(const char *name
, umode_t mode
,
283 struct dentry
*parent
, u64
*value
) { }
285 static inline void debugfs_create_size_t(const char *name
, umode_t mode
,
286 struct dentry
*parent
, size_t *value
)
289 static inline void debugfs_create_atomic_t(const char *name
, umode_t mode
,
290 struct dentry
*parent
,
294 static inline void debugfs_create_bool(const char *name
, umode_t mode
,
295 struct dentry
*parent
, bool *value
) { }
297 static inline void debugfs_create_str(const char *name
, umode_t mode
,
298 struct dentry
*parent
,
302 static inline struct dentry
*debugfs_create_blob(const char *name
, umode_t mode
,
303 struct dentry
*parent
,
304 struct debugfs_blob_wrapper
*blob
)
306 return ERR_PTR(-ENODEV
);
309 static inline void debugfs_create_regset32(const char *name
, umode_t mode
,
310 struct dentry
*parent
,
311 struct debugfs_regset32
*regset
)
315 static inline void debugfs_print_regs32(struct seq_file
*s
, const struct debugfs_reg32
*regs
,
316 int nregs
, void __iomem
*base
, char *prefix
)
320 static inline bool debugfs_initialized(void)
325 static inline void debugfs_create_u32_array(const char *name
, umode_t mode
,
326 struct dentry
*parent
,
327 struct debugfs_u32_array
*array
)
331 static inline void debugfs_create_devm_seqfile(struct device
*dev
,
333 struct dentry
*parent
,
334 int (*read_fn
)(struct seq_file
*s
,
339 static inline ssize_t
debugfs_read_file_bool(struct file
*file
,
340 char __user
*user_buf
,
341 size_t count
, loff_t
*ppos
)
346 static inline ssize_t
debugfs_write_file_bool(struct file
*file
,
347 const char __user
*user_buf
,
348 size_t count
, loff_t
*ppos
)
353 static inline ssize_t
debugfs_read_file_str(struct file
*file
,
354 char __user
*user_buf
,
355 size_t count
, loff_t
*ppos
)
363 * debugfs_create_xul - create a debugfs file that is used to read and write an
364 * unsigned long value, formatted in hexadecimal
365 * @name: a pointer to a string containing the name of the file to create.
366 * @mode: the permission that the file should have
367 * @parent: a pointer to the parent dentry for this file. This should be a
368 * directory dentry if set. If this parameter is %NULL, then the
369 * file will be created in the root of the debugfs filesystem.
370 * @value: a pointer to the variable that the file should read to and write
373 static inline void debugfs_create_xul(const char *name
, umode_t mode
,
374 struct dentry
*parent
,
375 unsigned long *value
)
377 if (sizeof(*value
) == sizeof(u32
))
378 debugfs_create_x32(name
, mode
, parent
, (u32
*)value
);
380 debugfs_create_x64(name
, mode
, parent
, (u64
*)value
);