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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#include <linux/compiler.h>
23
24struct device;
25struct file_operations;
26struct srcu_struct;
27
28struct debugfs_blob_wrapper {
29 void *data;
30 unsigned long size;
31};
32
33struct debugfs_reg32 {
34 char *name;
35 unsigned long offset;
36};
37
38struct debugfs_regset32 {
39 const struct debugfs_reg32 *regs;
40 int nregs;
41 void __iomem *base;
42};
43
44extern struct dentry *arch_debugfs_dir;
45
46extern struct srcu_struct debugfs_srcu;
47
48
49
50
51
52
53
54
55static inline const struct file_operations *debugfs_real_fops(const struct file *filp)
56 __must_hold(&debugfs_srcu)
57{
58
59
60
61
62 return filp->f_path.dentry->d_fsdata;
63}
64
65#define DEFINE_DEBUGFS_ATTRIBUTE(__fops, __get, __set, __fmt) \
66static int __fops ## _open(struct inode *inode, struct file *file) \
67{ \
68 __simple_attr_check_format(__fmt, 0ull); \
69 return simple_attr_open(inode, file, __get, __set, __fmt); \
70} \
71static const struct file_operations __fops = { \
72 .owner = THIS_MODULE, \
73 .open = __fops ## _open, \
74 .release = simple_attr_release, \
75 .read = debugfs_attr_read, \
76 .write = debugfs_attr_write, \
77 .llseek = no_llseek, \
78}
79
80#if defined(CONFIG_DEBUG_FS)
81
82struct dentry *debugfs_lookup(const char *name, struct dentry *parent);
83
84struct dentry *debugfs_create_file(const char *name, umode_t mode,
85 struct dentry *parent, void *data,
86 const struct file_operations *fops);
87struct dentry *debugfs_create_file_unsafe(const char *name, umode_t mode,
88 struct dentry *parent, void *data,
89 const struct file_operations *fops);
90
91struct dentry *debugfs_create_file_size(const char *name, umode_t mode,
92 struct dentry *parent, void *data,
93 const struct file_operations *fops,
94 loff_t file_size);
95
96struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
97
98struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
99 const char *dest);
100
101typedef struct vfsmount *(*debugfs_automount_t)(struct dentry *, void *);
102struct dentry *debugfs_create_automount(const char *name,
103 struct dentry *parent,
104 debugfs_automount_t f,
105 void *data);
106
107void debugfs_remove(struct dentry *dentry);
108void debugfs_remove_recursive(struct dentry *dentry);
109
110int debugfs_use_file_start(const struct dentry *dentry, int *srcu_idx)
111 __acquires(&debugfs_srcu);
112
113void debugfs_use_file_finish(int srcu_idx) __releases(&debugfs_srcu);
114
115ssize_t debugfs_attr_read(struct file *file, char __user *buf,
116 size_t len, loff_t *ppos);
117ssize_t debugfs_attr_write(struct file *file, const char __user *buf,
118 size_t len, loff_t *ppos);
119
120struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
121 struct dentry *new_dir, const char *new_name);
122
123struct dentry *debugfs_create_u8(const char *name, umode_t mode,
124 struct dentry *parent, u8 *value);
125struct dentry *debugfs_create_u16(const char *name, umode_t mode,
126 struct dentry *parent, u16 *value);
127struct dentry *debugfs_create_u32(const char *name, umode_t mode,
128 struct dentry *parent, u32 *value);
129struct dentry *debugfs_create_u64(const char *name, umode_t mode,
130 struct dentry *parent, u64 *value);
131struct dentry *debugfs_create_ulong(const char *name, umode_t mode,
132 struct dentry *parent, unsigned long *value);
133struct dentry *debugfs_create_x8(const char *name, umode_t mode,
134 struct dentry *parent, u8 *value);
135struct dentry *debugfs_create_x16(const char *name, umode_t mode,
136 struct dentry *parent, u16 *value);
137struct dentry *debugfs_create_x32(const char *name, umode_t mode,
138 struct dentry *parent, u32 *value);
139struct dentry *debugfs_create_x64(const char *name, umode_t mode,
140 struct dentry *parent, u64 *value);
141struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
142 struct dentry *parent, size_t *value);
143struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
144 struct dentry *parent, atomic_t *value);
145struct dentry *debugfs_create_bool(const char *name, umode_t mode,
146 struct dentry *parent, bool *value);
147
148struct dentry *debugfs_create_blob(const char *name, umode_t mode,
149 struct dentry *parent,
150 struct debugfs_blob_wrapper *blob);
151
152struct dentry *debugfs_create_regset32(const char *name, umode_t mode,
153 struct dentry *parent,
154 struct debugfs_regset32 *regset);
155
156void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
157 int nregs, void __iomem *base, char *prefix);
158
159struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
160 struct dentry *parent,
161 u32 *array, u32 elements);
162
163struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name,
164 struct dentry *parent,
165 int (*read_fn)(struct seq_file *s,
166 void *data));
167
168bool debugfs_initialized(void);
169
170ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
171 size_t count, loff_t *ppos);
172
173ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
174 size_t count, loff_t *ppos);
175
176#else
177
178#include <linux/err.h>
179
180
181
182
183
184
185
186static inline struct dentry *debugfs_lookup(const char *name,
187 struct dentry *parent)
188{
189 return ERR_PTR(-ENODEV);
190}
191
192static inline struct dentry *debugfs_create_file(const char *name, umode_t mode,
193 struct dentry *parent, void *data,
194 const struct file_operations *fops)
195{
196 return ERR_PTR(-ENODEV);
197}
198
199static inline struct dentry *debugfs_create_file_size(const char *name, umode_t mode,
200 struct dentry *parent, void *data,
201 const struct file_operations *fops,
202 loff_t file_size)
203{
204 return ERR_PTR(-ENODEV);
205}
206
207static inline struct dentry *debugfs_create_dir(const char *name,
208 struct dentry *parent)
209{
210 return ERR_PTR(-ENODEV);
211}
212
213static inline struct dentry *debugfs_create_symlink(const char *name,
214 struct dentry *parent,
215 const char *dest)
216{
217 return ERR_PTR(-ENODEV);
218}
219
220static inline struct dentry *debugfs_create_automount(const char *name,
221 struct dentry *parent,
222 struct vfsmount *(*f)(void *),
223 void *data)
224{
225 return ERR_PTR(-ENODEV);
226}
227
228static inline void debugfs_remove(struct dentry *dentry)
229{ }
230
231static inline void debugfs_remove_recursive(struct dentry *dentry)
232{ }
233
234static inline int debugfs_use_file_start(const struct dentry *dentry,
235 int *srcu_idx)
236 __acquires(&debugfs_srcu)
237{
238 return 0;
239}
240
241static inline void debugfs_use_file_finish(int srcu_idx)
242 __releases(&debugfs_srcu)
243{ }
244
245static inline ssize_t debugfs_attr_read(struct file *file, char __user *buf,
246 size_t len, loff_t *ppos)
247{
248 return -ENODEV;
249}
250
251static inline ssize_t debugfs_attr_write(struct file *file,
252 const char __user *buf,
253 size_t len, loff_t *ppos)
254{
255 return -ENODEV;
256}
257
258static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
259 struct dentry *new_dir, char *new_name)
260{
261 return ERR_PTR(-ENODEV);
262}
263
264static inline struct dentry *debugfs_create_u8(const char *name, umode_t mode,
265 struct dentry *parent,
266 u8 *value)
267{
268 return ERR_PTR(-ENODEV);
269}
270
271static inline struct dentry *debugfs_create_u16(const char *name, umode_t mode,
272 struct dentry *parent,
273 u16 *value)
274{
275 return ERR_PTR(-ENODEV);
276}
277
278static inline struct dentry *debugfs_create_u32(const char *name, umode_t mode,
279 struct dentry *parent,
280 u32 *value)
281{
282 return ERR_PTR(-ENODEV);
283}
284
285static inline struct dentry *debugfs_create_u64(const char *name, umode_t mode,
286 struct dentry *parent,
287 u64 *value)
288{
289 return ERR_PTR(-ENODEV);
290}
291
292static inline struct dentry *debugfs_create_x8(const char *name, umode_t mode,
293 struct dentry *parent,
294 u8 *value)
295{
296 return ERR_PTR(-ENODEV);
297}
298
299static inline struct dentry *debugfs_create_x16(const char *name, umode_t mode,
300 struct dentry *parent,
301 u16 *value)
302{
303 return ERR_PTR(-ENODEV);
304}
305
306static inline struct dentry *debugfs_create_x32(const char *name, umode_t mode,
307 struct dentry *parent,
308 u32 *value)
309{
310 return ERR_PTR(-ENODEV);
311}
312
313static inline struct dentry *debugfs_create_x64(const char *name, umode_t mode,
314 struct dentry *parent,
315 u64 *value)
316{
317 return ERR_PTR(-ENODEV);
318}
319
320static inline struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
321 struct dentry *parent,
322 size_t *value)
323{
324 return ERR_PTR(-ENODEV);
325}
326
327static inline struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
328 struct dentry *parent, atomic_t *value)
329{
330 return ERR_PTR(-ENODEV);
331}
332
333static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode,
334 struct dentry *parent,
335 bool *value)
336{
337 return ERR_PTR(-ENODEV);
338}
339
340static inline struct dentry *debugfs_create_blob(const char *name, umode_t mode,
341 struct dentry *parent,
342 struct debugfs_blob_wrapper *blob)
343{
344 return ERR_PTR(-ENODEV);
345}
346
347static inline struct dentry *debugfs_create_regset32(const char *name,
348 umode_t mode, struct dentry *parent,
349 struct debugfs_regset32 *regset)
350{
351 return ERR_PTR(-ENODEV);
352}
353
354static inline void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
355 int nregs, void __iomem *base, char *prefix)
356{
357}
358
359static inline bool debugfs_initialized(void)
360{
361 return false;
362}
363
364static inline struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
365 struct dentry *parent,
366 u32 *array, u32 elements)
367{
368 return ERR_PTR(-ENODEV);
369}
370
371static inline struct dentry *debugfs_create_devm_seqfile(struct device *dev,
372 const char *name,
373 struct dentry *parent,
374 int (*read_fn)(struct seq_file *s,
375 void *data))
376{
377 return ERR_PTR(-ENODEV);
378}
379
380static inline ssize_t debugfs_read_file_bool(struct file *file,
381 char __user *user_buf,
382 size_t count, loff_t *ppos)
383{
384 return -ENODEV;
385}
386
387static inline ssize_t debugfs_write_file_bool(struct file *file,
388 const char __user *user_buf,
389 size_t count, loff_t *ppos)
390{
391 return -ENODEV;
392}
393
394#endif
395
396#endif
397
