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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * debugfs.h - a tiny little debug file system
4 *
5 * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
6 * Copyright (C) 2004 IBM Inc.
7 *
8 * debugfs is for people to use instead of /proc or /sys.
9 * See Documentation/filesystems/ for more details.
10 */
11
12#ifndef _DEBUGFS_H_
13#define _DEBUGFS_H_
14
15#include <linux/fs.h>
16#include <linux/seq_file.h>
17
18#include <linux/types.h>
19#include <linux/compiler.h>
20
21struct device;
22struct file_operations;
23
24struct debugfs_blob_wrapper {
25 void *data;
26 unsigned long size;
27};
28
29struct debugfs_reg32 {
30 char *name;
31 unsigned long offset;
32};
33
34struct debugfs_regset32 {
35 const struct debugfs_reg32 *regs;
36 int nregs;
37 void __iomem *base;
38};
39
40extern struct dentry *arch_debugfs_dir;
41
42#define DEFINE_DEBUGFS_ATTRIBUTE(__fops, __get, __set, __fmt) \
43static int __fops ## _open(struct inode *inode, struct file *file) \
44{ \
45 __simple_attr_check_format(__fmt, 0ull); \
46 return simple_attr_open(inode, file, __get, __set, __fmt); \
47} \
48static const struct file_operations __fops = { \
49 .owner = THIS_MODULE, \
50 .open = __fops ## _open, \
51 .release = simple_attr_release, \
52 .read = debugfs_attr_read, \
53 .write = debugfs_attr_write, \
54 .llseek = no_llseek, \
55}
56
57#if defined(CONFIG_DEBUG_FS)
58
59struct dentry *debugfs_lookup(const char *name, struct dentry *parent);
60
61struct dentry *debugfs_create_file(const char *name, umode_t mode,
62 struct dentry *parent, void *data,
63 const struct file_operations *fops);
64struct dentry *debugfs_create_file_unsafe(const char *name, umode_t mode,
65 struct dentry *parent, void *data,
66 const struct file_operations *fops);
67
68struct dentry *debugfs_create_file_size(const char *name, umode_t mode,
69 struct dentry *parent, void *data,
70 const struct file_operations *fops,
71 loff_t file_size);
72
73struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
74
75struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
76 const char *dest);
77
78typedef struct vfsmount *(*debugfs_automount_t)(struct dentry *, void *);
79struct dentry *debugfs_create_automount(const char *name,
80 struct dentry *parent,
81 debugfs_automount_t f,
82 void *data);
83
84void debugfs_remove(struct dentry *dentry);
85void debugfs_remove_recursive(struct dentry *dentry);
86
87const struct file_operations *debugfs_real_fops(const struct file *filp);
88
89int debugfs_file_get(struct dentry *dentry);
90void debugfs_file_put(struct dentry *dentry);
91
92ssize_t debugfs_attr_read(struct file *file, char __user *buf,
93 size_t len, loff_t *ppos);
94ssize_t debugfs_attr_write(struct file *file, const char __user *buf,
95 size_t len, loff_t *ppos);
96
97struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
98 struct dentry *new_dir, const char *new_name);
99
100struct dentry *debugfs_create_u8(const char *name, umode_t mode,
101 struct dentry *parent, u8 *value);
102struct dentry *debugfs_create_u16(const char *name, umode_t mode,
103 struct dentry *parent, u16 *value);
104struct dentry *debugfs_create_u32(const char *name, umode_t mode,
105 struct dentry *parent, u32 *value);
106struct dentry *debugfs_create_u64(const char *name, umode_t mode,
107 struct dentry *parent, u64 *value);
108struct dentry *debugfs_create_ulong(const char *name, umode_t mode,
109 struct dentry *parent, unsigned long *value);
110struct dentry *debugfs_create_x8(const char *name, umode_t mode,
111 struct dentry *parent, u8 *value);
112struct dentry *debugfs_create_x16(const char *name, umode_t mode,
113 struct dentry *parent, u16 *value);
114struct dentry *debugfs_create_x32(const char *name, umode_t mode,
115 struct dentry *parent, u32 *value);
116struct dentry *debugfs_create_x64(const char *name, umode_t mode,
117 struct dentry *parent, u64 *value);
118struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
119 struct dentry *parent, size_t *value);
120struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
121 struct dentry *parent, atomic_t *value);
122struct dentry *debugfs_create_bool(const char *name, umode_t mode,
123 struct dentry *parent, bool *value);
124
125struct dentry *debugfs_create_blob(const char *name, umode_t mode,
126 struct dentry *parent,
127 struct debugfs_blob_wrapper *blob);
128
129struct dentry *debugfs_create_regset32(const char *name, umode_t mode,
130 struct dentry *parent,
131 struct debugfs_regset32 *regset);
132
133void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
134 int nregs, void __iomem *base, char *prefix);
135
136struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
137 struct dentry *parent,
138 u32 *array, u32 elements);
139
140struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name,
141 struct dentry *parent,
142 int (*read_fn)(struct seq_file *s,
143 void *data));
144
145bool debugfs_initialized(void);
146
147ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
148 size_t count, loff_t *ppos);
149
150ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
151 size_t count, loff_t *ppos);
152
153#else
154
155#include <linux/err.h>
156
157/*
158 * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
159 * so users have a chance to detect if there was a real error or not. We don't
160 * want to duplicate the design decision mistakes of procfs and devfs again.
161 */
162
163static inline struct dentry *debugfs_lookup(const char *name,
164 struct dentry *parent)
165{
166 return ERR_PTR(-ENODEV);
167}
168
169static inline struct dentry *debugfs_create_file(const char *name, umode_t mode,
170 struct dentry *parent, void *data,
171 const struct file_operations *fops)
172{
173 return ERR_PTR(-ENODEV);
174}
175
176static inline struct dentry *debugfs_create_file_unsafe(const char *name,
177 umode_t mode, struct dentry *parent,
178 void *data,
179 const struct file_operations *fops)
180{
181 return ERR_PTR(-ENODEV);
182}
183
184static inline struct dentry *debugfs_create_file_size(const char *name, umode_t mode,
185 struct dentry *parent, void *data,
186 const struct file_operations *fops,
187 loff_t file_size)
188{
189 return ERR_PTR(-ENODEV);
190}
191
192static inline struct dentry *debugfs_create_dir(const char *name,
193 struct dentry *parent)
194{
195 return ERR_PTR(-ENODEV);
196}
197
198static inline struct dentry *debugfs_create_symlink(const char *name,
199 struct dentry *parent,
200 const char *dest)
201{
202 return ERR_PTR(-ENODEV);
203}
204
205static inline struct dentry *debugfs_create_automount(const char *name,
206 struct dentry *parent,
207 struct vfsmount *(*f)(void *),
208 void *data)
209{
210 return ERR_PTR(-ENODEV);
211}
212
213static inline void debugfs_remove(struct dentry *dentry)
214{ }
215
216static inline void debugfs_remove_recursive(struct dentry *dentry)
217{ }
218
219const struct file_operations *debugfs_real_fops(const struct file *filp);
220
221static inline int debugfs_file_get(struct dentry *dentry)
222{
223 return 0;
224}
225
226static inline void debugfs_file_put(struct dentry *dentry)
227{ }
228
229static inline ssize_t debugfs_attr_read(struct file *file, char __user *buf,
230 size_t len, loff_t *ppos)
231{
232 return -ENODEV;
233}
234
235static inline ssize_t debugfs_attr_write(struct file *file,
236 const char __user *buf,
237 size_t len, loff_t *ppos)
238{
239 return -ENODEV;
240}
241
242static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
243 struct dentry *new_dir, char *new_name)
244{
245 return ERR_PTR(-ENODEV);
246}
247
248static inline struct dentry *debugfs_create_u8(const char *name, umode_t mode,
249 struct dentry *parent,
250 u8 *value)
251{
252 return ERR_PTR(-ENODEV);
253}
254
255static inline struct dentry *debugfs_create_u16(const char *name, umode_t mode,
256 struct dentry *parent,
257 u16 *value)
258{
259 return ERR_PTR(-ENODEV);
260}
261
262static inline struct dentry *debugfs_create_u32(const char *name, umode_t mode,
263 struct dentry *parent,
264 u32 *value)
265{
266 return ERR_PTR(-ENODEV);
267}
268
269static inline struct dentry *debugfs_create_u64(const char *name, umode_t mode,
270 struct dentry *parent,
271 u64 *value)
272{
273 return ERR_PTR(-ENODEV);
274}
275
276static inline struct dentry *debugfs_create_ulong(const char *name,
277 umode_t mode,
278 struct dentry *parent,
279 unsigned long *value)
280{
281 return ERR_PTR(-ENODEV);
282}
283
284static inline struct dentry *debugfs_create_x8(const char *name, umode_t mode,
285 struct dentry *parent,
286 u8 *value)
287{
288 return ERR_PTR(-ENODEV);
289}
290
291static inline struct dentry *debugfs_create_x16(const char *name, umode_t mode,
292 struct dentry *parent,
293 u16 *value)
294{
295 return ERR_PTR(-ENODEV);
296}
297
298static inline struct dentry *debugfs_create_x32(const char *name, umode_t mode,
299 struct dentry *parent,
300 u32 *value)
301{
302 return ERR_PTR(-ENODEV);
303}
304
305static inline struct dentry *debugfs_create_x64(const char *name, umode_t mode,
306 struct dentry *parent,
307 u64 *value)
308{
309 return ERR_PTR(-ENODEV);
310}
311
312static inline struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
313 struct dentry *parent,
314 size_t *value)
315{
316 return ERR_PTR(-ENODEV);
317}
318
319static inline struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
320 struct dentry *parent, atomic_t *value)
321{
322 return ERR_PTR(-ENODEV);
323}
324
325static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode,
326 struct dentry *parent,
327 bool *value)
328{
329 return ERR_PTR(-ENODEV);
330}
331
332static inline struct dentry *debugfs_create_blob(const char *name, umode_t mode,
333 struct dentry *parent,
334 struct debugfs_blob_wrapper *blob)
335{
336 return ERR_PTR(-ENODEV);
337}
338
339static inline struct dentry *debugfs_create_regset32(const char *name,
340 umode_t mode, struct dentry *parent,
341 struct debugfs_regset32 *regset)
342{
343 return ERR_PTR(-ENODEV);
344}
345
346static inline void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
347 int nregs, void __iomem *base, char *prefix)
348{
349}
350
351static inline bool debugfs_initialized(void)
352{
353 return false;
354}
355
356static inline struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
357 struct dentry *parent,
358 u32 *array, u32 elements)
359{
360 return ERR_PTR(-ENODEV);
361}
362
363static inline struct dentry *debugfs_create_devm_seqfile(struct device *dev,
364 const char *name,
365 struct dentry *parent,
366 int (*read_fn)(struct seq_file *s,
367 void *data))
368{
369 return ERR_PTR(-ENODEV);
370}
371
372static inline ssize_t debugfs_read_file_bool(struct file *file,
373 char __user *user_buf,
374 size_t count, loff_t *ppos)
375{
376 return -ENODEV;
377}
378
379static inline ssize_t debugfs_write_file_bool(struct file *file,
380 const char __user *user_buf,
381 size_t count, loff_t *ppos)
382{
383 return -ENODEV;
384}
385
386#endif
387
388#endif