384 lines
11 KiB
C
384 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* debugfs.h - a tiny little debug file system
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*
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* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (C) 2004 IBM Inc.
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*
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* debugfs is for people to use instead of /proc or /sys.
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* See Documentation/filesystems/ for more details.
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*/
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#ifndef _DEBUGFS_H_
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#define _DEBUGFS_H_
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#include <linux/fs.h>
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#include <linux/seq_file.h>
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#include <linux/types.h>
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#include <linux/compiler.h>
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struct device;
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struct file_operations;
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struct debugfs_blob_wrapper {
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void *data;
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unsigned long size;
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};
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struct debugfs_reg32 {
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char *name;
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unsigned long offset;
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};
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struct debugfs_regset32 {
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const struct debugfs_reg32 *regs;
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int nregs;
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void __iomem *base;
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struct device *dev; /* Optional device for Runtime PM */
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};
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struct debugfs_u32_array {
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u32 *array;
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u32 n_elements;
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};
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extern struct dentry *arch_debugfs_dir;
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#define DEFINE_DEBUGFS_ATTRIBUTE(__fops, __get, __set, __fmt) \
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static int __fops ## _open(struct inode *inode, struct file *file) \
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{ \
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__simple_attr_check_format(__fmt, 0ull); \
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return simple_attr_open(inode, file, __get, __set, __fmt); \
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} \
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static const struct file_operations __fops = { \
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.owner = THIS_MODULE, \
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.open = __fops ## _open, \
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.release = simple_attr_release, \
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.read = debugfs_attr_read, \
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.write = debugfs_attr_write, \
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.llseek = no_llseek, \
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}
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typedef struct vfsmount *(*debugfs_automount_t)(struct dentry *, void *);
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#if defined(CONFIG_DEBUG_FS)
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struct dentry *debugfs_lookup(const char *name, struct dentry *parent);
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struct dentry *debugfs_create_file(const char *name, umode_t mode,
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struct dentry *parent, void *data,
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const struct file_operations *fops);
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struct dentry *debugfs_create_file_unsafe(const char *name, umode_t mode,
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struct dentry *parent, void *data,
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const struct file_operations *fops);
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void debugfs_create_file_size(const char *name, umode_t mode,
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struct dentry *parent, void *data,
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const struct file_operations *fops,
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loff_t file_size);
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struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
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struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
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const char *dest);
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struct dentry *debugfs_create_automount(const char *name,
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struct dentry *parent,
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debugfs_automount_t f,
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void *data);
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void debugfs_remove(struct dentry *dentry);
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#define debugfs_remove_recursive debugfs_remove
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const struct file_operations *debugfs_real_fops(const struct file *filp);
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int debugfs_file_get(struct dentry *dentry);
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void debugfs_file_put(struct dentry *dentry);
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ssize_t debugfs_attr_read(struct file *file, char __user *buf,
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size_t len, loff_t *ppos);
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ssize_t debugfs_attr_write(struct file *file, const char __user *buf,
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size_t len, loff_t *ppos);
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struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
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struct dentry *new_dir, const char *new_name);
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void debugfs_create_u8(const char *name, umode_t mode, struct dentry *parent,
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u8 *value);
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void debugfs_create_u16(const char *name, umode_t mode, struct dentry *parent,
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u16 *value);
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void debugfs_create_u32(const char *name, umode_t mode, struct dentry *parent,
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u32 *value);
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void debugfs_create_u64(const char *name, umode_t mode, struct dentry *parent,
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u64 *value);
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void debugfs_create_ulong(const char *name, umode_t mode, struct dentry *parent,
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unsigned long *value);
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void debugfs_create_x8(const char *name, umode_t mode, struct dentry *parent,
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u8 *value);
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void debugfs_create_x16(const char *name, umode_t mode, struct dentry *parent,
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u16 *value);
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void debugfs_create_x32(const char *name, umode_t mode, struct dentry *parent,
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u32 *value);
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void debugfs_create_x64(const char *name, umode_t mode, struct dentry *parent,
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u64 *value);
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void debugfs_create_size_t(const char *name, umode_t mode,
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struct dentry *parent, size_t *value);
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void debugfs_create_atomic_t(const char *name, umode_t mode,
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struct dentry *parent, atomic_t *value);
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void debugfs_create_bool(const char *name, umode_t mode, struct dentry *parent,
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bool *value);
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void debugfs_create_str(const char *name, umode_t mode,
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struct dentry *parent, char **value);
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struct dentry *debugfs_create_blob(const char *name, umode_t mode,
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struct dentry *parent,
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struct debugfs_blob_wrapper *blob);
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void debugfs_create_regset32(const char *name, umode_t mode,
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struct dentry *parent,
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struct debugfs_regset32 *regset);
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void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
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int nregs, void __iomem *base, char *prefix);
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void debugfs_create_u32_array(const char *name, umode_t mode,
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struct dentry *parent,
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struct debugfs_u32_array *array);
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void debugfs_create_devm_seqfile(struct device *dev, const char *name,
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struct dentry *parent,
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int (*read_fn)(struct seq_file *s, void *data));
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bool debugfs_initialized(void);
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ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos);
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ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
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size_t count, loff_t *ppos);
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ssize_t debugfs_read_file_str(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos);
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#else
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#include <linux/err.h>
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/*
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* We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
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* so users have a chance to detect if there was a real error or not. We don't
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* want to duplicate the design decision mistakes of procfs and devfs again.
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*/
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static inline struct dentry *debugfs_lookup(const char *name,
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struct dentry *parent)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline struct dentry *debugfs_create_file(const char *name, umode_t mode,
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struct dentry *parent, void *data,
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const struct file_operations *fops)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline struct dentry *debugfs_create_file_unsafe(const char *name,
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umode_t mode, struct dentry *parent,
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void *data,
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const struct file_operations *fops)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline void debugfs_create_file_size(const char *name, umode_t mode,
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struct dentry *parent, void *data,
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const struct file_operations *fops,
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loff_t file_size)
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{ }
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static inline struct dentry *debugfs_create_dir(const char *name,
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struct dentry *parent)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline struct dentry *debugfs_create_symlink(const char *name,
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struct dentry *parent,
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const char *dest)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline struct dentry *debugfs_create_automount(const char *name,
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struct dentry *parent,
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debugfs_automount_t f,
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void *data)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline void debugfs_remove(struct dentry *dentry)
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{ }
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static inline void debugfs_remove_recursive(struct dentry *dentry)
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{ }
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const struct file_operations *debugfs_real_fops(const struct file *filp);
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static inline int debugfs_file_get(struct dentry *dentry)
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{
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return 0;
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}
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static inline void debugfs_file_put(struct dentry *dentry)
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{ }
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static inline ssize_t debugfs_attr_read(struct file *file, char __user *buf,
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size_t len, loff_t *ppos)
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{
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return -ENODEV;
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}
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static inline ssize_t debugfs_attr_write(struct file *file,
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const char __user *buf,
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size_t len, loff_t *ppos)
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{
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return -ENODEV;
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}
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static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
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struct dentry *new_dir, char *new_name)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline void debugfs_create_u8(const char *name, umode_t mode,
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struct dentry *parent, u8 *value) { }
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static inline void debugfs_create_u16(const char *name, umode_t mode,
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struct dentry *parent, u16 *value) { }
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static inline void debugfs_create_u32(const char *name, umode_t mode,
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struct dentry *parent, u32 *value) { }
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static inline void debugfs_create_u64(const char *name, umode_t mode,
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struct dentry *parent, u64 *value) { }
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static inline void debugfs_create_ulong(const char *name, umode_t mode,
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struct dentry *parent,
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unsigned long *value) { }
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static inline void debugfs_create_x8(const char *name, umode_t mode,
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struct dentry *parent, u8 *value) { }
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static inline void debugfs_create_x16(const char *name, umode_t mode,
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struct dentry *parent, u16 *value) { }
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static inline void debugfs_create_x32(const char *name, umode_t mode,
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struct dentry *parent, u32 *value) { }
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static inline void debugfs_create_x64(const char *name, umode_t mode,
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struct dentry *parent, u64 *value) { }
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static inline void debugfs_create_size_t(const char *name, umode_t mode,
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struct dentry *parent, size_t *value)
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{ }
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static inline void debugfs_create_atomic_t(const char *name, umode_t mode,
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struct dentry *parent,
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atomic_t *value)
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{ }
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static inline void debugfs_create_bool(const char *name, umode_t mode,
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struct dentry *parent, bool *value) { }
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static inline void debugfs_create_str(const char *name, umode_t mode,
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struct dentry *parent,
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char **value)
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{ }
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static inline struct dentry *debugfs_create_blob(const char *name, umode_t mode,
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struct dentry *parent,
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struct debugfs_blob_wrapper *blob)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline void debugfs_create_regset32(const char *name, umode_t mode,
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struct dentry *parent,
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struct debugfs_regset32 *regset)
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{
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}
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static inline void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
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int nregs, void __iomem *base, char *prefix)
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{
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}
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static inline bool debugfs_initialized(void)
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{
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return false;
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}
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static inline void debugfs_create_u32_array(const char *name, umode_t mode,
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struct dentry *parent,
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struct debugfs_u32_array *array)
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{
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}
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static inline void debugfs_create_devm_seqfile(struct device *dev,
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const char *name,
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struct dentry *parent,
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int (*read_fn)(struct seq_file *s,
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void *data))
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{
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}
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static inline ssize_t debugfs_read_file_bool(struct file *file,
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char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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return -ENODEV;
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}
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static inline ssize_t debugfs_write_file_bool(struct file *file,
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const char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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return -ENODEV;
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}
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static inline ssize_t debugfs_read_file_str(struct file *file,
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char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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return -ENODEV;
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}
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#endif
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/**
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* debugfs_create_xul - create a debugfs file that is used to read and write an
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* unsigned long value, formatted in hexadecimal
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* @name: a pointer to a string containing the name of the file to create.
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* @mode: the permission that the file should have
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* @parent: a pointer to the parent dentry for this file. This should be a
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* directory dentry if set. If this parameter is %NULL, then the
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* file will be created in the root of the debugfs filesystem.
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* @value: a pointer to the variable that the file should read to and write
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* from.
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*/
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static inline void debugfs_create_xul(const char *name, umode_t mode,
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struct dentry *parent,
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unsigned long *value)
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{
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if (sizeof(*value) == sizeof(u32))
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debugfs_create_x32(name, mode, parent, (u32 *)value);
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else
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debugfs_create_x64(name, mode, parent, (u64 *)value);
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}
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#endif
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