2017-11-07 23:59:23 +08:00
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// SPDX-License-Identifier: GPL-2.0
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2005-04-17 06:20:36 +08:00
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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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2017-05-14 23:04:55 +08:00
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* See Documentation/filesystems/ for more details.
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2005-04-17 06:20:36 +08:00
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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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2011-11-18 21:50:21 +08:00
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#include <linux/seq_file.h>
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2005-04-17 06:20:36 +08:00
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2005-04-19 12:57:33 +08:00
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#include <linux/types.h>
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debugfs: prevent access to removed files' private data
Upon return of debugfs_remove()/debugfs_remove_recursive(), it might
still be attempted to access associated private file data through
previously opened struct file objects. If that data has been freed by
the caller of debugfs_remove*() in the meanwhile, the reading/writing
process would either encounter a fault or, if the memory address in
question has been reassigned again, unrelated data structures could get
overwritten.
However, since debugfs files are seldomly removed, usually from module
exit handlers only, the impact is very low.
Currently, there are ~1000 call sites of debugfs_create_file() spread
throughout the whole tree and touching all of those struct file_operations
in order to make them file removal aware by means of checking the result of
debugfs_use_file_start() from within their methods is unfeasible.
Instead, wrap the struct file_operations by a lifetime managing proxy at
file open:
- In debugfs_create_file(), the original fops handed in has got stashed
away in ->d_fsdata already.
- In debugfs_create_file(), install a proxy file_operations factory,
debugfs_full_proxy_file_operations, at ->i_fop.
This proxy factory has got an ->open() method only. It carries out some
lifetime checks and if successful, dynamically allocates and sets up a new
struct file_operations proxy at ->f_op. Afterwards, it forwards to the
->open() of the original struct file_operations in ->d_fsdata, if any.
The dynamically set up proxy at ->f_op has got a lifetime managing wrapper
set for each of the methods defined in the original struct file_operations
in ->d_fsdata.
Its ->release()er frees the proxy again and forwards to the original
->release(), if any.
In order not to mislead the VFS layer, it is strictly necessary to leave
those fields blank in the proxy that have been NULL in the original
struct file_operations also, i.e. aren't supported. This is why there is a
need for dynamically allocated proxies. The choice made not to allocate a
proxy instance for every dentry at file creation, but for every
struct file object instantiated thereof is justified by the expected usage
pattern of debugfs, namely that in general very few files get opened more
than once at a time.
The wrapper methods set in the struct file_operations implement lifetime
managing by means of the SRCU protection facilities already in place for
debugfs:
They set up a SRCU read side critical section and check whether the dentry
is still alive by means of debugfs_use_file_start(). If so, they forward
the call to the original struct file_operation stored in ->d_fsdata, still
under the protection of the SRCU read side critical section.
This SRCU read side critical section prevents any pending debugfs_remove()
and friends to return to their callers. Since a file's private data must
only be freed after the return of debugfs_remove(), the ongoing proxied
call is guarded against any file removal race.
If, on the other hand, the initial call to debugfs_use_file_start() detects
that the dentry is dead, the wrapper simply returns -EIO and does not
forward the call. Note that the ->poll() wrapper is special in that its
signature does not allow for the return of arbitrary -EXXX values and thus,
POLLHUP is returned here.
In order not to pollute debugfs with wrapper definitions that aren't ever
needed, I chose not to define a wrapper for every struct file_operations
method possible. Instead, a wrapper is defined only for the subset of
methods which are actually set by any debugfs users.
Currently, these are:
->llseek()
->read()
->write()
->unlocked_ioctl()
->poll()
The ->release() wrapper is special in that it does not protect the original
->release() in any way from dead files in order not to leak resources.
Thus, any ->release() handed to debugfs must implement file lifetime
management manually, if needed.
For only 33 out of a total of 434 releasers handed in to debugfs, it could
not be verified immediately whether they access data structures that might
have been freed upon a debugfs_remove() return in the meanwhile.
Export debugfs_use_file_start() and debugfs_use_file_finish() in order to
allow any ->release() to manually implement file lifetime management.
For a set of common cases of struct file_operations implemented by the
debugfs_core itself, future patches will incorporate file lifetime
management directly within those in order to allow for their unproxied
operation. Rename the original, non-proxying "debugfs_create_file()" to
"debugfs_create_file_unsafe()" and keep it for future internal use by
debugfs itself. Factor out code common to both into the new
__debugfs_create_file().
Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-03-22 21:11:14 +08:00
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#include <linux/compiler.h>
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2005-04-19 12:57:33 +08:00
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2014-11-30 23:31:21 +08:00
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struct device;
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2005-04-19 12:57:33 +08:00
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struct file_operations;
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2006-03-07 18:41:59 +08:00
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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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2011-11-18 21:50:21 +08:00
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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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2013-01-19 04:40:32 +08:00
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const struct debugfs_reg32 *regs;
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2011-11-18 21:50:21 +08:00
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int nregs;
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void __iomem *base;
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};
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2008-07-19 07:08:13 +08:00
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extern struct dentry *arch_debugfs_dir;
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2016-10-21 04:07:53 +08:00
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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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2017-03-11 08:44:57 +08:00
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.llseek = no_llseek, \
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2016-10-21 04:07:53 +08:00
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}
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2005-04-17 06:20:36 +08:00
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#if defined(CONFIG_DEBUG_FS)
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2008-02-14 09:08:16 +08:00
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2017-02-01 06:53:17 +08:00
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struct dentry *debugfs_lookup(const char *name, struct dentry *parent);
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2011-07-24 16:33:43 +08:00
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struct dentry *debugfs_create_file(const char *name, umode_t mode,
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2005-04-17 06:20:36 +08:00
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struct dentry *parent, void *data,
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2006-03-28 17:56:41 +08:00
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const struct file_operations *fops);
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2016-03-22 21:11:15 +08:00
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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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2005-04-17 06:20:36 +08:00
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2015-01-22 04:03:40 +08:00
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struct dentry *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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2005-04-17 06:20:36 +08:00
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struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
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2007-02-13 19:13:54 +08:00
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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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2017-02-01 01:06:16 +08:00
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typedef struct vfsmount *(*debugfs_automount_t)(struct dentry *, void *);
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2015-01-26 04:10:32 +08:00
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struct dentry *debugfs_create_automount(const char *name,
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struct dentry *parent,
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2017-02-01 01:06:16 +08:00
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debugfs_automount_t f,
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2015-01-26 04:10:32 +08:00
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void *data);
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2005-04-17 06:20:36 +08:00
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void debugfs_remove(struct dentry *dentry);
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2008-07-01 21:14:51 +08:00
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void debugfs_remove_recursive(struct dentry *dentry);
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2005-04-17 06:20:36 +08:00
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2017-10-31 07:15:49 +08:00
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const struct file_operations *debugfs_real_fops(const struct file *filp);
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2017-10-31 07:15:47 +08:00
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debugfs: implement per-file removal protection
Since commit 49d200deaa68 ("debugfs: prevent access to removed files'
private data"), accesses to a file's private data are protected from
concurrent removal by covering all file_operations with a SRCU read section
and sychronizing with those before returning from debugfs_remove() by means
of synchronize_srcu().
As pointed out by Johannes Berg, there are debugfs files with forever
blocking file_operations. Their corresponding SRCU read side sections would
block any debugfs_remove() forever as well, even unrelated ones. This
results in a livelock. Because a remover can't cancel any indefinite
blocking within foreign files, this is a problem.
Resolve this by introducing support for more granular protection on a
per-file basis.
This is implemented by introducing an 'active_users' refcount_t to the
per-file struct debugfs_fsdata state. At file creation time, it is set to
one and a debugfs_remove() will drop that initial reference. The new
debugfs_file_get() and debugfs_file_put(), intended to be used in place of
former debugfs_use_file_start() and debugfs_use_file_finish(), increment
and decrement it respectively. Once the count drops to zero,
debugfs_file_put() will signal a completion which is possibly being waited
for from debugfs_remove().
Thus, as long as there is a debugfs_file_get() not yet matched by a
corresponding debugfs_file_put() around, debugfs_remove() will block.
Actual users of debugfs_use_file_start() and -finish() will get converted
to the new debugfs_file_get() and debugfs_file_put() by followup patches.
Fixes: 49d200deaa68 ("debugfs: prevent access to removed files' private data")
Reported-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-10-31 07:15:48 +08:00
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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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2016-03-22 21:11:15 +08:00
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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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2007-05-09 19:19:52 +08:00
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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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2019-10-11 21:29:24 +08:00
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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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2019-10-11 21:29:25 +08:00
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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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2011-07-24 16:33:43 +08:00
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struct dentry *debugfs_create_u32(const char *name, umode_t mode,
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2005-04-17 06:20:36 +08:00
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struct dentry *parent, u32 *value);
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2019-10-11 21:29:26 +08:00
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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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2015-10-19 01:13:19 +08:00
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struct dentry *debugfs_create_ulong(const char *name, umode_t mode,
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struct dentry *parent, unsigned long *value);
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2019-10-11 21:29:28 +08:00
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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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2019-10-11 21:29:29 +08:00
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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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2019-10-11 21:29:30 +08:00
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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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2019-10-11 21:29:31 +08:00
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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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2019-10-11 21:29:27 +08:00
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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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2019-10-16 21:03:32 +08:00
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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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2011-07-24 16:33:43 +08:00
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struct dentry *debugfs_create_bool(const char *name, umode_t mode,
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2015-09-27 06:04:07 +08:00
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struct dentry *parent, bool *value);
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2005-04-17 06:20:36 +08:00
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2011-07-24 16:33:43 +08:00
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struct dentry *debugfs_create_blob(const char *name, umode_t mode,
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2006-03-07 18:41:59 +08:00
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struct dentry *parent,
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struct debugfs_blob_wrapper *blob);
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2009-03-23 06:10:44 +08:00
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2012-03-20 18:00:24 +08:00
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struct dentry *debugfs_create_regset32(const char *name, umode_t mode,
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2011-11-18 21:50:21 +08:00
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struct dentry *parent,
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struct debugfs_regset32 *regset);
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2014-09-30 07:08:26 +08:00
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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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2011-11-18 21:50:21 +08:00
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2019-04-16 21:46:55 +08:00
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void debugfs_create_u32_array(const char *name, umode_t mode,
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struct dentry *parent, u32 *array, u32 elements);
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2012-03-23 16:06:28 +08:00
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2014-11-09 18:31:58 +08:00
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struct dentry *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,
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void *data));
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2009-03-23 06:10:44 +08:00
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bool debugfs_initialized(void);
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2015-06-23 21:32:54 +08:00
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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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2005-04-17 06:20:36 +08:00
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#else
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2005-04-19 12:57:33 +08:00
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#include <linux/err.h>
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2014-11-09 18:31:58 +08:00
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/*
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2005-04-17 06:20:36 +08:00
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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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2017-02-01 06:53:17 +08:00
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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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2011-07-24 16:33:43 +08:00
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static inline struct dentry *debugfs_create_file(const char *name, umode_t mode,
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2006-04-19 12:30:22 +08:00
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struct dentry *parent, void *data,
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const struct file_operations *fops)
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2005-04-17 06:20:36 +08:00
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{
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return ERR_PTR(-ENODEV);
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}
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2017-06-29 12:09:02 +08:00
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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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2015-01-22 04:03:40 +08:00
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static inline struct dentry *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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return ERR_PTR(-ENODEV);
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}
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2005-04-17 06:20:36 +08:00
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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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2007-02-13 19:13:54 +08:00
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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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2015-11-22 16:05:10 +08:00
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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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struct vfsmount *(*f)(void *),
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void *data)
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|
|
|
|
{
|
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
|
}
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
static inline void debugfs_remove(struct dentry *dentry)
|
|
|
|
|
{ }
|
|
|
|
|
|
2008-07-01 21:14:51 +08:00
|
|
|
static inline void debugfs_remove_recursive(struct dentry *dentry)
|
|
|
|
|
{ }
|
|
|
|
|
|
debugfs: fix debugfs_real_fops() build error
Some drivers use debugfs_real_fops() even when CONFIG_DEBUG_FS is disabled,
which now leads to a build error:
In file included from include/linux/list.h:9:0,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from drivers/net/wireless/broadcom/b43legacy/debugfs.c:26:
drivers/net/wireless/broadcom/b43legacy/debugfs.c: In function 'b43legacy_debugfs_read':
drivers/net/wireless/broadcom/b43legacy/debugfs.c:224:23: error: implicit declaration of function 'debugfs_real_fops'; did you mean 'debugfs_create_bool'? [-Werror=implicit-function-declaration]
My first impulse was to add another 'static inline' dummy function
returning NULL for it, which would work fine. However, most callers
feed the pointer into container_of(), so it seems a little dangerous
here. Since all the callers are inside of a read/write file operation
that gets eliminated in this configuration, so having an 'extern'
declaration seems better here. If it ever gets used in a dangerous
way, that will now result in a link error.
Fixes: 7c8d469877b1 ("debugfs: add support for more elaborate ->d_fsdata")
Cc: Jakub Kicinski <jakub.kicinski@netronome.com>
Cc: Simon Horman <simon.horman@netronome.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-14 19:40:31 +08:00
|
|
|
const struct file_operations *debugfs_real_fops(const struct file *filp);
|
|
|
|
|
|
debugfs: implement per-file removal protection
Since commit 49d200deaa68 ("debugfs: prevent access to removed files'
private data"), accesses to a file's private data are protected from
concurrent removal by covering all file_operations with a SRCU read section
and sychronizing with those before returning from debugfs_remove() by means
of synchronize_srcu().
As pointed out by Johannes Berg, there are debugfs files with forever
blocking file_operations. Their corresponding SRCU read side sections would
block any debugfs_remove() forever as well, even unrelated ones. This
results in a livelock. Because a remover can't cancel any indefinite
blocking within foreign files, this is a problem.
Resolve this by introducing support for more granular protection on a
per-file basis.
This is implemented by introducing an 'active_users' refcount_t to the
per-file struct debugfs_fsdata state. At file creation time, it is set to
one and a debugfs_remove() will drop that initial reference. The new
debugfs_file_get() and debugfs_file_put(), intended to be used in place of
former debugfs_use_file_start() and debugfs_use_file_finish(), increment
and decrement it respectively. Once the count drops to zero,
debugfs_file_put() will signal a completion which is possibly being waited
for from debugfs_remove().
Thus, as long as there is a debugfs_file_get() not yet matched by a
corresponding debugfs_file_put() around, debugfs_remove() will block.
Actual users of debugfs_use_file_start() and -finish() will get converted
to the new debugfs_file_get() and debugfs_file_put() by followup patches.
Fixes: 49d200deaa68 ("debugfs: prevent access to removed files' private data")
Reported-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-10-31 07:15:48 +08:00
|
|
|
static inline int debugfs_file_get(struct dentry *dentry)
|
|
|
|
|
{
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline void debugfs_file_put(struct dentry *dentry)
|
|
|
|
|
{ }
|
|
|
|
|
|
2016-10-21 04:07:53 +08:00
|
|
|
static inline ssize_t debugfs_attr_read(struct file *file, char __user *buf,
|
|
|
|
|
size_t len, loff_t *ppos)
|
|
|
|
|
{
|
|
|
|
|
return -ENODEV;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline ssize_t debugfs_attr_write(struct file *file,
|
|
|
|
|
const char __user *buf,
|
|
|
|
|
size_t len, loff_t *ppos)
|
|
|
|
|
{
|
|
|
|
|
return -ENODEV;
|
|
|
|
|
}
|
2016-03-22 21:11:15 +08:00
|
|
|
|
2007-05-09 19:19:52 +08:00
|
|
|
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);
|
|
|
|
|
}
|
|
|
|
|
|
2019-10-11 21:29:24 +08:00
|
|
|
static inline void debugfs_create_u8(const char *name, umode_t mode,
|
|
|
|
|
struct dentry *parent, u8 *value) { }
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2019-10-11 21:29:25 +08:00
|
|
|
static inline void debugfs_create_u16(const char *name, umode_t mode,
|
|
|
|
|
struct dentry *parent, u16 *value) { }
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2011-07-24 16:33:43 +08:00
|
|
|
static inline struct dentry *debugfs_create_u32(const char *name, umode_t mode,
|
2005-04-17 06:20:36 +08:00
|
|
|
struct dentry *parent,
|
2005-04-19 12:57:34 +08:00
|
|
|
u32 *value)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
|
}
|
|
|
|
|
|
2019-10-11 21:29:26 +08:00
|
|
|
static inline void debugfs_create_u64(const char *name, umode_t mode,
|
|
|
|
|
struct dentry *parent, u64 *value) { }
|
2007-04-17 13:59:36 +08:00
|
|
|
|
2017-06-29 12:09:02 +08:00
|
|
|
static inline struct dentry *debugfs_create_ulong(const char *name,
|
|
|
|
|
umode_t mode,
|
|
|
|
|
struct dentry *parent,
|
|
|
|
|
unsigned long *value)
|
|
|
|
|
{
|
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
|
}
|
|
|
|
|
|
2019-10-11 21:29:28 +08:00
|
|
|
static inline void debugfs_create_x8(const char *name, umode_t mode,
|
|
|
|
|
struct dentry *parent, u8 *value) { }
|
2007-08-03 06:23:50 +08:00
|
|
|
|
2019-10-11 21:29:29 +08:00
|
|
|
static inline void debugfs_create_x16(const char *name, umode_t mode,
|
|
|
|
|
struct dentry *parent, u16 *value) { }
|
2007-08-03 06:23:50 +08:00
|
|
|
|
2019-10-11 21:29:30 +08:00
|
|
|
static inline void debugfs_create_x32(const char *name, umode_t mode,
|
|
|
|
|
struct dentry *parent, u32 *value) { }
|
2007-08-03 06:23:50 +08:00
|
|
|
|
2019-10-11 21:29:31 +08:00
|
|
|
static inline void debugfs_create_x64(const char *name, umode_t mode,
|
|
|
|
|
struct dentry *parent, u64 *value) { }
|
2013-08-26 15:58:30 +08:00
|
|
|
|
2019-10-11 21:29:27 +08:00
|
|
|
static inline void debugfs_create_size_t(const char *name, umode_t mode,
|
|
|
|
|
struct dentry *parent, size_t *value)
|
|
|
|
|
{ }
|
2009-01-21 04:17:28 +08:00
|
|
|
|
2019-10-16 21:03:32 +08:00
|
|
|
static inline void debugfs_create_atomic_t(const char *name, umode_t mode,
|
|
|
|
|
struct dentry *parent,
|
|
|
|
|
atomic_t *value)
|
|
|
|
|
{ }
|
2013-09-27 17:09:07 +08:00
|
|
|
|
2011-07-24 16:33:43 +08:00
|
|
|
static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode,
|
2005-04-17 06:20:36 +08:00
|
|
|
struct dentry *parent,
|
2015-09-27 06:04:07 +08:00
|
|
|
bool *value)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
|
}
|
|
|
|
|
|
2011-07-24 16:33:43 +08:00
|
|
|
static inline struct dentry *debugfs_create_blob(const char *name, umode_t mode,
|
2006-03-07 18:41:59 +08:00
|
|
|
struct dentry *parent,
|
|
|
|
|
struct debugfs_blob_wrapper *blob)
|
|
|
|
|
{
|
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
|
}
|
|
|
|
|
|
2011-11-18 21:50:21 +08:00
|
|
|
static inline struct dentry *debugfs_create_regset32(const char *name,
|
2012-03-20 18:00:24 +08:00
|
|
|
umode_t mode, struct dentry *parent,
|
2011-11-18 21:50:21 +08:00
|
|
|
struct debugfs_regset32 *regset)
|
|
|
|
|
{
|
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
|
}
|
|
|
|
|
|
2014-09-30 07:08:26 +08:00
|
|
|
static inline void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
|
2013-09-27 17:09:07 +08:00
|
|
|
int nregs, void __iomem *base, char *prefix)
|
|
|
|
|
{
|
|
|
|
|
}
|
|
|
|
|
|
2009-03-23 06:10:44 +08:00
|
|
|
static inline bool debugfs_initialized(void)
|
|
|
|
|
{
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
2019-04-16 21:46:55 +08:00
|
|
|
static inline void debugfs_create_u32_array(const char *name, umode_t mode,
|
|
|
|
|
struct dentry *parent, u32 *array,
|
|
|
|
|
u32 elements)
|
2012-03-23 16:06:28 +08:00
|
|
|
{
|
|
|
|
|
}
|
|
|
|
|
|
2014-11-09 18:31:58 +08:00
|
|
|
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);
|
|
|
|
|
}
|
|
|
|
|
|
2015-06-23 21:32:54 +08:00
|
|
|
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;
|
|
|
|
|
}
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#endif
|