379 lines
10 KiB
C
379 lines
10 KiB
C
/*
|
|
* debugfs.h - a tiny little debug file system
|
|
*
|
|
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
|
|
* Copyright (C) 2004 IBM Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version
|
|
* 2 as published by the Free Software Foundation.
|
|
*
|
|
* debugfs is for people to use instead of /proc or /sys.
|
|
* See Documentation/DocBook/filesystems for more details.
|
|
*/
|
|
|
|
#ifndef _DEBUGFS_H_
|
|
#define _DEBUGFS_H_
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/compiler.h>
|
|
|
|
struct device;
|
|
struct file_operations;
|
|
struct srcu_struct;
|
|
|
|
struct debugfs_blob_wrapper {
|
|
void *data;
|
|
unsigned long size;
|
|
};
|
|
|
|
struct debugfs_reg32 {
|
|
char *name;
|
|
unsigned long offset;
|
|
};
|
|
|
|
struct debugfs_regset32 {
|
|
const struct debugfs_reg32 *regs;
|
|
int nregs;
|
|
void __iomem *base;
|
|
};
|
|
|
|
extern struct dentry *arch_debugfs_dir;
|
|
|
|
extern struct srcu_struct debugfs_srcu;
|
|
|
|
/**
|
|
* debugfs_real_fops - getter for the real file operation
|
|
* @filp: a pointer to a struct file
|
|
*
|
|
* Must only be called under the protection established by
|
|
* debugfs_use_file_start().
|
|
*/
|
|
static inline const struct file_operations *
|
|
debugfs_real_fops(const struct file *filp)
|
|
__must_hold(&debugfs_srcu)
|
|
{
|
|
/*
|
|
* Neither the pointer to the struct file_operations, nor its
|
|
* contents ever change -- srcu_dereference() is not needed here.
|
|
*/
|
|
return filp->f_path.dentry->d_fsdata;
|
|
}
|
|
|
|
#if defined(CONFIG_DEBUG_FS)
|
|
|
|
struct dentry *debugfs_create_file(const char *name, umode_t mode,
|
|
struct dentry *parent, void *data,
|
|
const struct file_operations *fops);
|
|
struct dentry *debugfs_create_file_unsafe(const char *name, umode_t mode,
|
|
struct dentry *parent, void *data,
|
|
const struct file_operations *fops);
|
|
|
|
struct dentry *debugfs_create_file_size(const char *name, umode_t mode,
|
|
struct dentry *parent, void *data,
|
|
const struct file_operations *fops,
|
|
loff_t file_size);
|
|
|
|
struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
|
|
|
|
struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
|
|
const char *dest);
|
|
|
|
struct dentry *debugfs_create_automount(const char *name,
|
|
struct dentry *parent,
|
|
struct vfsmount *(*f)(void *),
|
|
void *data);
|
|
|
|
void debugfs_remove(struct dentry *dentry);
|
|
void debugfs_remove_recursive(struct dentry *dentry);
|
|
|
|
int debugfs_use_file_start(const struct dentry *dentry, int *srcu_idx)
|
|
__acquires(&debugfs_srcu);
|
|
|
|
void debugfs_use_file_finish(int srcu_idx) __releases(&debugfs_srcu);
|
|
|
|
ssize_t debugfs_attr_read(struct file *file, char __user *buf,
|
|
size_t len, loff_t *ppos);
|
|
ssize_t debugfs_attr_write(struct file *file, const char __user *buf,
|
|
size_t len, loff_t *ppos);
|
|
|
|
#define DEFINE_DEBUGFS_ATTRIBUTE(__fops, __get, __set, __fmt) \
|
|
static int __fops ## _open(struct inode *inode, struct file *file) \
|
|
{ \
|
|
__simple_attr_check_format(__fmt, 0ull); \
|
|
return simple_attr_open(inode, file, __get, __set, __fmt); \
|
|
} \
|
|
static const struct file_operations __fops = { \
|
|
.owner = THIS_MODULE, \
|
|
.open = __fops ## _open, \
|
|
.release = simple_attr_release, \
|
|
.read = debugfs_attr_read, \
|
|
.write = debugfs_attr_write, \
|
|
.llseek = generic_file_llseek, \
|
|
}
|
|
|
|
struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
|
|
struct dentry *new_dir, const char *new_name);
|
|
|
|
struct dentry *debugfs_create_u8(const char *name, umode_t mode,
|
|
struct dentry *parent, u8 *value);
|
|
struct dentry *debugfs_create_u16(const char *name, umode_t mode,
|
|
struct dentry *parent, u16 *value);
|
|
struct dentry *debugfs_create_u32(const char *name, umode_t mode,
|
|
struct dentry *parent, u32 *value);
|
|
struct dentry *debugfs_create_u64(const char *name, umode_t mode,
|
|
struct dentry *parent, u64 *value);
|
|
struct dentry *debugfs_create_ulong(const char *name, umode_t mode,
|
|
struct dentry *parent, unsigned long *value);
|
|
struct dentry *debugfs_create_x8(const char *name, umode_t mode,
|
|
struct dentry *parent, u8 *value);
|
|
struct dentry *debugfs_create_x16(const char *name, umode_t mode,
|
|
struct dentry *parent, u16 *value);
|
|
struct dentry *debugfs_create_x32(const char *name, umode_t mode,
|
|
struct dentry *parent, u32 *value);
|
|
struct dentry *debugfs_create_x64(const char *name, umode_t mode,
|
|
struct dentry *parent, u64 *value);
|
|
struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
|
|
struct dentry *parent, size_t *value);
|
|
struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
|
|
struct dentry *parent, atomic_t *value);
|
|
struct dentry *debugfs_create_bool(const char *name, umode_t mode,
|
|
struct dentry *parent, bool *value);
|
|
|
|
struct dentry *debugfs_create_blob(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
struct debugfs_blob_wrapper *blob);
|
|
|
|
struct dentry *debugfs_create_regset32(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
struct debugfs_regset32 *regset);
|
|
|
|
void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
|
|
int nregs, void __iomem *base, char *prefix);
|
|
|
|
struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u32 *array, u32 elements);
|
|
|
|
struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name,
|
|
struct dentry *parent,
|
|
int (*read_fn)(struct seq_file *s,
|
|
void *data));
|
|
|
|
bool debugfs_initialized(void);
|
|
|
|
ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
|
|
size_t count, loff_t *ppos);
|
|
|
|
ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
|
|
size_t count, loff_t *ppos);
|
|
|
|
#else
|
|
|
|
#include <linux/err.h>
|
|
|
|
/*
|
|
* We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
|
|
* so users have a chance to detect if there was a real error or not. We don't
|
|
* want to duplicate the design decision mistakes of procfs and devfs again.
|
|
*/
|
|
|
|
static inline struct dentry *debugfs_create_file(const char *name, umode_t mode,
|
|
struct dentry *parent, void *data,
|
|
const struct file_operations *fops)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_file_size(const char *name, umode_t mode,
|
|
struct dentry *parent, void *data,
|
|
const struct file_operations *fops,
|
|
loff_t file_size)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_dir(const char *name,
|
|
struct dentry *parent)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_symlink(const char *name,
|
|
struct dentry *parent,
|
|
const char *dest)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_automount(const char *name,
|
|
struct dentry *parent,
|
|
struct vfsmount *(*f)(void *),
|
|
void *data)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline void debugfs_remove(struct dentry *dentry)
|
|
{ }
|
|
|
|
static inline void debugfs_remove_recursive(struct dentry *dentry)
|
|
{ }
|
|
|
|
static inline int debugfs_use_file_start(const struct dentry *dentry,
|
|
int *srcu_idx)
|
|
__acquires(&debugfs_srcu)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void debugfs_use_file_finish(int srcu_idx)
|
|
__releases(&debugfs_srcu)
|
|
{ }
|
|
|
|
#define DEFINE_DEBUGFS_ATTRIBUTE(__fops, __get, __set, __fmt) \
|
|
static const struct file_operations __fops = { 0 }
|
|
|
|
static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
|
|
struct dentry *new_dir, char *new_name)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_u8(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u8 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_u16(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u16 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_u32(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u32 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_u64(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u64 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_x8(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u8 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_x16(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u16 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_x32(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u32 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_x64(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u64 *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
size_t *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
|
|
struct dentry *parent, atomic_t *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
bool *value)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_blob(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
struct debugfs_blob_wrapper *blob)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_regset32(const char *name,
|
|
umode_t mode, struct dentry *parent,
|
|
struct debugfs_regset32 *regset)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
|
|
int nregs, void __iomem *base, char *prefix)
|
|
{
|
|
}
|
|
|
|
static inline bool debugfs_initialized(void)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
u32 *array, u32 elements)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline struct dentry *debugfs_create_devm_seqfile(struct device *dev,
|
|
const char *name,
|
|
struct dentry *parent,
|
|
int (*read_fn)(struct seq_file *s,
|
|
void *data))
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline ssize_t debugfs_read_file_bool(struct file *file,
|
|
char __user *user_buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static inline ssize_t debugfs_write_file_bool(struct file *file,
|
|
const char __user *user_buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|