| 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 | |
| 23 | struct file_operations; |
| 24 | |
| 25 | struct debugfs_blob_wrapper { |
| 26 | void *data; |
| 27 | unsigned long size; |
| 28 | }; |
| 29 | |
| 30 | struct debugfs_reg32 { |
| 31 | char *name; |
| 32 | unsigned long offset; |
| 33 | }; |
| 34 | |
| 35 | struct debugfs_regset32 { |
| 36 | const struct debugfs_reg32 *regs; |
| 37 | int nregs; |
| 38 | void __iomem *base; |
| 39 | }; |
| 40 | |
| 41 | extern struct dentry *arch_debugfs_dir; |
| 42 | |
| 43 | #if defined(CONFIG_DEBUG_FS) |
| 44 | |
| 45 | /* declared over in file.c */ |
| 46 | extern const struct file_operations debugfs_file_operations; |
| 47 | extern const struct inode_operations debugfs_link_operations; |
| 48 | |
| 49 | struct dentry *debugfs_create_file(const char *name, umode_t mode, |
| 50 | struct dentry *parent, void *data, |
| 51 | const struct file_operations *fops); |
| 52 | |
| 53 | struct dentry *debugfs_create_dir(const char *name, struct dentry *parent); |
| 54 | |
| 55 | struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent, |
| 56 | const char *dest); |
| 57 | |
| 58 | void debugfs_remove(struct dentry *dentry); |
| 59 | void debugfs_remove_recursive(struct dentry *dentry); |
| 60 | |
| 61 | struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry, |
| 62 | struct dentry *new_dir, const char *new_name); |
| 63 | |
| 64 | struct dentry *debugfs_create_u8(const char *name, umode_t mode, |
| 65 | struct dentry *parent, u8 *value); |
| 66 | struct dentry *debugfs_create_u16(const char *name, umode_t mode, |
| 67 | struct dentry *parent, u16 *value); |
| 68 | struct dentry *debugfs_create_u32(const char *name, umode_t mode, |
| 69 | struct dentry *parent, u32 *value); |
| 70 | struct dentry *debugfs_create_u64(const char *name, umode_t mode, |
| 71 | struct dentry *parent, u64 *value); |
| 72 | struct dentry *debugfs_create_x8(const char *name, umode_t mode, |
| 73 | struct dentry *parent, u8 *value); |
| 74 | struct dentry *debugfs_create_x16(const char *name, umode_t mode, |
| 75 | struct dentry *parent, u16 *value); |
| 76 | struct dentry *debugfs_create_x32(const char *name, umode_t mode, |
| 77 | struct dentry *parent, u32 *value); |
| 78 | struct dentry *debugfs_create_x64(const char *name, umode_t mode, |
| 79 | struct dentry *parent, u64 *value); |
| 80 | struct dentry *debugfs_create_size_t(const char *name, umode_t mode, |
| 81 | struct dentry *parent, size_t *value); |
| 82 | struct dentry *debugfs_create_bool(const char *name, umode_t mode, |
| 83 | struct dentry *parent, u32 *value); |
| 84 | |
| 85 | struct dentry *debugfs_create_blob(const char *name, umode_t mode, |
| 86 | struct dentry *parent, |
| 87 | struct debugfs_blob_wrapper *blob); |
| 88 | |
| 89 | struct dentry *debugfs_create_regset32(const char *name, umode_t mode, |
| 90 | struct dentry *parent, |
| 91 | struct debugfs_regset32 *regset); |
| 92 | |
| 93 | int debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs, |
| 94 | int nregs, void __iomem *base, char *prefix); |
| 95 | |
| 96 | struct dentry *debugfs_create_u32_array(const char *name, umode_t mode, |
| 97 | struct dentry *parent, |
| 98 | u32 *array, u32 elements); |
| 99 | |
| 100 | bool debugfs_initialized(void); |
| 101 | |
| 102 | #else |
| 103 | |
| 104 | #include <linux/err.h> |
| 105 | |
| 106 | /* |
| 107 | * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled |
| 108 | * so users have a chance to detect if there was a real error or not. We don't |
| 109 | * want to duplicate the design decision mistakes of procfs and devfs again. |
| 110 | */ |
| 111 | |
| 112 | static inline struct dentry *debugfs_create_file(const char *name, umode_t mode, |
| 113 | struct dentry *parent, void *data, |
| 114 | const struct file_operations *fops) |
| 115 | { |
| 116 | return ERR_PTR(-ENODEV); |
| 117 | } |
| 118 | |
| 119 | static inline struct dentry *debugfs_create_dir(const char *name, |
| 120 | struct dentry *parent) |
| 121 | { |
| 122 | return ERR_PTR(-ENODEV); |
| 123 | } |
| 124 | |
| 125 | static inline struct dentry *debugfs_create_symlink(const char *name, |
| 126 | struct dentry *parent, |
| 127 | const char *dest) |
| 128 | { |
| 129 | return ERR_PTR(-ENODEV); |
| 130 | } |
| 131 | |
| 132 | static inline void debugfs_remove(struct dentry *dentry) |
| 133 | { } |
| 134 | |
| 135 | static inline void debugfs_remove_recursive(struct dentry *dentry) |
| 136 | { } |
| 137 | |
| 138 | static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry, |
| 139 | struct dentry *new_dir, char *new_name) |
| 140 | { |
| 141 | return ERR_PTR(-ENODEV); |
| 142 | } |
| 143 | |
| 144 | static inline struct dentry *debugfs_create_u8(const char *name, umode_t mode, |
| 145 | struct dentry *parent, |
| 146 | u8 *value) |
| 147 | { |
| 148 | return ERR_PTR(-ENODEV); |
| 149 | } |
| 150 | |
| 151 | static inline struct dentry *debugfs_create_u16(const char *name, umode_t mode, |
| 152 | struct dentry *parent, |
| 153 | u16 *value) |
| 154 | { |
| 155 | return ERR_PTR(-ENODEV); |
| 156 | } |
| 157 | |
| 158 | static inline struct dentry *debugfs_create_u32(const char *name, umode_t mode, |
| 159 | struct dentry *parent, |
| 160 | u32 *value) |
| 161 | { |
| 162 | return ERR_PTR(-ENODEV); |
| 163 | } |
| 164 | |
| 165 | static inline struct dentry *debugfs_create_u64(const char *name, umode_t mode, |
| 166 | struct dentry *parent, |
| 167 | u64 *value) |
| 168 | { |
| 169 | return ERR_PTR(-ENODEV); |
| 170 | } |
| 171 | |
| 172 | static inline struct dentry *debugfs_create_x8(const char *name, umode_t mode, |
| 173 | struct dentry *parent, |
| 174 | u8 *value) |
| 175 | { |
| 176 | return ERR_PTR(-ENODEV); |
| 177 | } |
| 178 | |
| 179 | static inline struct dentry *debugfs_create_x16(const char *name, umode_t mode, |
| 180 | struct dentry *parent, |
| 181 | u16 *value) |
| 182 | { |
| 183 | return ERR_PTR(-ENODEV); |
| 184 | } |
| 185 | |
| 186 | static inline struct dentry *debugfs_create_x32(const char *name, umode_t mode, |
| 187 | struct dentry *parent, |
| 188 | u32 *value) |
| 189 | { |
| 190 | return ERR_PTR(-ENODEV); |
| 191 | } |
| 192 | |
| 193 | static inline struct dentry *debugfs_create_size_t(const char *name, umode_t mode, |
| 194 | struct dentry *parent, |
| 195 | size_t *value) |
| 196 | { |
| 197 | return ERR_PTR(-ENODEV); |
| 198 | } |
| 199 | |
| 200 | static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode, |
| 201 | struct dentry *parent, |
| 202 | u32 *value) |
| 203 | { |
| 204 | return ERR_PTR(-ENODEV); |
| 205 | } |
| 206 | |
| 207 | static inline struct dentry *debugfs_create_blob(const char *name, umode_t mode, |
| 208 | struct dentry *parent, |
| 209 | struct debugfs_blob_wrapper *blob) |
| 210 | { |
| 211 | return ERR_PTR(-ENODEV); |
| 212 | } |
| 213 | |
| 214 | static inline struct dentry *debugfs_create_regset32(const char *name, |
| 215 | umode_t mode, struct dentry *parent, |
| 216 | struct debugfs_regset32 *regset) |
| 217 | { |
| 218 | return ERR_PTR(-ENODEV); |
| 219 | } |
| 220 | |
| 221 | static inline bool debugfs_initialized(void) |
| 222 | { |
| 223 | return false; |
| 224 | } |
| 225 | |
| 226 | static inline struct dentry *debugfs_create_u32_array(const char *name, umode_t mode, |
| 227 | struct dentry *parent, |
| 228 | u32 *array, u32 elements) |
| 229 | { |
| 230 | return ERR_PTR(-ENODEV); |
| 231 | } |
| 232 | |
| 233 | #endif |
| 234 | |
| 235 | #endif |