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 23struct device; 24struct file_operations; 25 26struct debugfs_blob_wrapper { 27 void *data; 28 unsigned long size; 29}; 30 31struct debugfs_reg32 { 32 char *name; 33 unsigned long offset; 34}; 35 36struct debugfs_regset32 { 37 const struct debugfs_reg32 *regs; 38 int nregs; 39 void __iomem *base; 40}; 41 42extern struct dentry *arch_debugfs_dir; 43 44#if defined(CONFIG_DEBUG_FS) 45 46/* declared over in file.c */ 47extern const struct file_operations debugfs_file_operations; 48 49struct dentry *debugfs_create_file(const char *name, umode_t mode, 50 struct dentry *parent, void *data, 51 const struct file_operations *fops); 52 53struct dentry *debugfs_create_file_size(const char *name, umode_t mode, 54 struct dentry *parent, void *data, 55 const struct file_operations *fops, 56 loff_t file_size); 57 58struct dentry *debugfs_create_dir(const char *name, struct dentry *parent); 59 60struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent, 61 const char *dest); 62 63struct dentry *debugfs_create_automount(const char *name, 64 struct dentry *parent, 65 struct vfsmount *(*f)(void *), 66 void *data); 67 68void debugfs_remove(struct dentry *dentry); 69void debugfs_remove_recursive(struct dentry *dentry); 70 71struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry, 72 struct dentry *new_dir, const char *new_name); 73 74struct dentry *debugfs_create_u8(const char *name, umode_t mode, 75 struct dentry *parent, u8 *value); 76struct dentry *debugfs_create_u16(const char *name, umode_t mode, 77 struct dentry *parent, u16 *value); 78struct dentry *debugfs_create_u32(const char *name, umode_t mode, 79 struct dentry *parent, u32 *value); 80struct dentry *debugfs_create_u64(const char *name, umode_t mode, 81 struct dentry *parent, u64 *value); 82struct dentry *debugfs_create_ulong(const char *name, umode_t mode, 83 struct dentry *parent, unsigned long *value); 84struct dentry *debugfs_create_x8(const char *name, umode_t mode, 85 struct dentry *parent, u8 *value); 86struct dentry *debugfs_create_x16(const char *name, umode_t mode, 87 struct dentry *parent, u16 *value); 88struct dentry *debugfs_create_x32(const char *name, umode_t mode, 89 struct dentry *parent, u32 *value); 90struct dentry *debugfs_create_x64(const char *name, umode_t mode, 91 struct dentry *parent, u64 *value); 92struct dentry *debugfs_create_size_t(const char *name, umode_t mode, 93 struct dentry *parent, size_t *value); 94struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode, 95 struct dentry *parent, atomic_t *value); 96struct dentry *debugfs_create_bool(const char *name, umode_t mode, 97 struct dentry *parent, bool *value); 98 99struct dentry *debugfs_create_blob(const char *name, umode_t mode, 100 struct dentry *parent, 101 struct debugfs_blob_wrapper *blob); 102 103struct dentry *debugfs_create_regset32(const char *name, umode_t mode, 104 struct dentry *parent, 105 struct debugfs_regset32 *regset); 106 107void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs, 108 int nregs, void __iomem *base, char *prefix); 109 110struct dentry *debugfs_create_u32_array(const char *name, umode_t mode, 111 struct dentry *parent, 112 u32 *array, u32 elements); 113 114struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name, 115 struct dentry *parent, 116 int (*read_fn)(struct seq_file *s, 117 void *data)); 118 119bool debugfs_initialized(void); 120 121ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf, 122 size_t count, loff_t *ppos); 123 124ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf, 125 size_t count, loff_t *ppos); 126 127#else 128 129#include <linux/err.h> 130 131/* 132 * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled 133 * so users have a chance to detect if there was a real error or not. We don't 134 * want to duplicate the design decision mistakes of procfs and devfs again. 135 */ 136 137static inline struct dentry *debugfs_create_file(const char *name, umode_t mode, 138 struct dentry *parent, void *data, 139 const struct file_operations *fops) 140{ 141 return ERR_PTR(-ENODEV); 142} 143 144static inline struct dentry *debugfs_create_file_size(const char *name, umode_t mode, 145 struct dentry *parent, void *data, 146 const struct file_operations *fops, 147 loff_t file_size) 148{ 149 return ERR_PTR(-ENODEV); 150} 151 152static inline struct dentry *debugfs_create_dir(const char *name, 153 struct dentry *parent) 154{ 155 return ERR_PTR(-ENODEV); 156} 157 158static inline struct dentry *debugfs_create_symlink(const char *name, 159 struct dentry *parent, 160 const char *dest) 161{ 162 return ERR_PTR(-ENODEV); 163} 164 165static inline void debugfs_remove(struct dentry *dentry) 166{ } 167 168static inline void debugfs_remove_recursive(struct dentry *dentry) 169{ } 170 171static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry, 172 struct dentry *new_dir, char *new_name) 173{ 174 return ERR_PTR(-ENODEV); 175} 176 177static inline struct dentry *debugfs_create_u8(const char *name, umode_t mode, 178 struct dentry *parent, 179 u8 *value) 180{ 181 return ERR_PTR(-ENODEV); 182} 183 184static inline struct dentry *debugfs_create_u16(const char *name, umode_t mode, 185 struct dentry *parent, 186 u16 *value) 187{ 188 return ERR_PTR(-ENODEV); 189} 190 191static inline struct dentry *debugfs_create_u32(const char *name, umode_t mode, 192 struct dentry *parent, 193 u32 *value) 194{ 195 return ERR_PTR(-ENODEV); 196} 197 198static inline struct dentry *debugfs_create_u64(const char *name, umode_t mode, 199 struct dentry *parent, 200 u64 *value) 201{ 202 return ERR_PTR(-ENODEV); 203} 204 205static inline struct dentry *debugfs_create_x8(const char *name, umode_t mode, 206 struct dentry *parent, 207 u8 *value) 208{ 209 return ERR_PTR(-ENODEV); 210} 211 212static inline struct dentry *debugfs_create_x16(const char *name, umode_t mode, 213 struct dentry *parent, 214 u16 *value) 215{ 216 return ERR_PTR(-ENODEV); 217} 218 219static inline struct dentry *debugfs_create_x32(const char *name, umode_t mode, 220 struct dentry *parent, 221 u32 *value) 222{ 223 return ERR_PTR(-ENODEV); 224} 225 226static inline struct dentry *debugfs_create_x64(const char *name, umode_t mode, 227 struct dentry *parent, 228 u64 *value) 229{ 230 return ERR_PTR(-ENODEV); 231} 232 233static inline struct dentry *debugfs_create_size_t(const char *name, umode_t mode, 234 struct dentry *parent, 235 size_t *value) 236{ 237 return ERR_PTR(-ENODEV); 238} 239 240static inline struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode, 241 struct dentry *parent, atomic_t *value) 242{ 243 return ERR_PTR(-ENODEV); 244} 245 246static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode, 247 struct dentry *parent, 248 bool *value) 249{ 250 return ERR_PTR(-ENODEV); 251} 252 253static inline struct dentry *debugfs_create_blob(const char *name, umode_t mode, 254 struct dentry *parent, 255 struct debugfs_blob_wrapper *blob) 256{ 257 return ERR_PTR(-ENODEV); 258} 259 260static inline struct dentry *debugfs_create_regset32(const char *name, 261 umode_t mode, struct dentry *parent, 262 struct debugfs_regset32 *regset) 263{ 264 return ERR_PTR(-ENODEV); 265} 266 267static inline void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs, 268 int nregs, void __iomem *base, char *prefix) 269{ 270} 271 272static inline bool debugfs_initialized(void) 273{ 274 return false; 275} 276 277static inline struct dentry *debugfs_create_u32_array(const char *name, umode_t mode, 278 struct dentry *parent, 279 u32 *array, u32 elements) 280{ 281 return ERR_PTR(-ENODEV); 282} 283 284static inline struct dentry *debugfs_create_devm_seqfile(struct device *dev, 285 const char *name, 286 struct dentry *parent, 287 int (*read_fn)(struct seq_file *s, 288 void *data)) 289{ 290 return ERR_PTR(-ENODEV); 291} 292 293static inline ssize_t debugfs_read_file_bool(struct file *file, 294 char __user *user_buf, 295 size_t count, loff_t *ppos) 296{ 297 return -ENODEV; 298} 299 300static inline ssize_t debugfs_write_file_bool(struct file *file, 301 const char __user *user_buf, 302 size_t count, loff_t *ppos) 303{ 304 return -ENODEV; 305} 306 307#endif 308 309#endif 310