mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Greg Kroah-Hartman](/assets/img/avatar_default.png)
No one checks the return value of debugfs_create_regset32(), as it's not needed, so make the return value void, so that no one tries to do so in the future. Link: https://lore.kernel.org/r/20191122104453.GA2017837@kroah.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1154 lines
36 KiB
C
1154 lines
36 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* file.c - part of debugfs, a tiny little debug file system
|
|
*
|
|
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
|
|
* Copyright (C) 2004 IBM Inc.
|
|
*
|
|
* debugfs is for people to use instead of /proc or /sys.
|
|
* See Documentation/filesystems/ for more details.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/io.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/atomic.h>
|
|
#include <linux/device.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/security.h>
|
|
|
|
#include "internal.h"
|
|
|
|
struct poll_table_struct;
|
|
|
|
static ssize_t default_read_file(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t default_write_file(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return count;
|
|
}
|
|
|
|
const struct file_operations debugfs_noop_file_operations = {
|
|
.read = default_read_file,
|
|
.write = default_write_file,
|
|
.open = simple_open,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
#define F_DENTRY(filp) ((filp)->f_path.dentry)
|
|
|
|
const struct file_operations *debugfs_real_fops(const struct file *filp)
|
|
{
|
|
struct debugfs_fsdata *fsd = F_DENTRY(filp)->d_fsdata;
|
|
|
|
if ((unsigned long)fsd & DEBUGFS_FSDATA_IS_REAL_FOPS_BIT) {
|
|
/*
|
|
* Urgh, we've been called w/o a protecting
|
|
* debugfs_file_get().
|
|
*/
|
|
WARN_ON(1);
|
|
return NULL;
|
|
}
|
|
|
|
return fsd->real_fops;
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_real_fops);
|
|
|
|
/**
|
|
* debugfs_file_get - mark the beginning of file data access
|
|
* @dentry: the dentry object whose data is being accessed.
|
|
*
|
|
* Up to a matching call to debugfs_file_put(), any successive call
|
|
* into the file removing functions debugfs_remove() and
|
|
* debugfs_remove_recursive() will block. Since associated private
|
|
* file data may only get freed after a successful return of any of
|
|
* the removal functions, you may safely access it after a successful
|
|
* call to debugfs_file_get() without worrying about lifetime issues.
|
|
*
|
|
* If -%EIO is returned, the file has already been removed and thus,
|
|
* it is not safe to access any of its data. If, on the other hand,
|
|
* it is allowed to access the file data, zero is returned.
|
|
*/
|
|
int debugfs_file_get(struct dentry *dentry)
|
|
{
|
|
struct debugfs_fsdata *fsd;
|
|
void *d_fsd;
|
|
|
|
d_fsd = READ_ONCE(dentry->d_fsdata);
|
|
if (!((unsigned long)d_fsd & DEBUGFS_FSDATA_IS_REAL_FOPS_BIT)) {
|
|
fsd = d_fsd;
|
|
} else {
|
|
fsd = kmalloc(sizeof(*fsd), GFP_KERNEL);
|
|
if (!fsd)
|
|
return -ENOMEM;
|
|
|
|
fsd->real_fops = (void *)((unsigned long)d_fsd &
|
|
~DEBUGFS_FSDATA_IS_REAL_FOPS_BIT);
|
|
refcount_set(&fsd->active_users, 1);
|
|
init_completion(&fsd->active_users_drained);
|
|
if (cmpxchg(&dentry->d_fsdata, d_fsd, fsd) != d_fsd) {
|
|
kfree(fsd);
|
|
fsd = READ_ONCE(dentry->d_fsdata);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* In case of a successful cmpxchg() above, this check is
|
|
* strictly necessary and must follow it, see the comment in
|
|
* __debugfs_remove_file().
|
|
* OTOH, if the cmpxchg() hasn't been executed or wasn't
|
|
* successful, this serves the purpose of not starving
|
|
* removers.
|
|
*/
|
|
if (d_unlinked(dentry))
|
|
return -EIO;
|
|
|
|
if (!refcount_inc_not_zero(&fsd->active_users))
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_file_get);
|
|
|
|
/**
|
|
* debugfs_file_put - mark the end of file data access
|
|
* @dentry: the dentry object formerly passed to
|
|
* debugfs_file_get().
|
|
*
|
|
* Allow any ongoing concurrent call into debugfs_remove() or
|
|
* debugfs_remove_recursive() blocked by a former call to
|
|
* debugfs_file_get() to proceed and return to its caller.
|
|
*/
|
|
void debugfs_file_put(struct dentry *dentry)
|
|
{
|
|
struct debugfs_fsdata *fsd = READ_ONCE(dentry->d_fsdata);
|
|
|
|
if (refcount_dec_and_test(&fsd->active_users))
|
|
complete(&fsd->active_users_drained);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_file_put);
|
|
|
|
/*
|
|
* Only permit access to world-readable files when the kernel is locked down.
|
|
* We also need to exclude any file that has ways to write or alter it as root
|
|
* can bypass the permissions check.
|
|
*/
|
|
static int debugfs_locked_down(struct inode *inode,
|
|
struct file *filp,
|
|
const struct file_operations *real_fops)
|
|
{
|
|
if ((inode->i_mode & 07777) == 0444 &&
|
|
!(filp->f_mode & FMODE_WRITE) &&
|
|
!real_fops->unlocked_ioctl &&
|
|
!real_fops->compat_ioctl &&
|
|
!real_fops->mmap)
|
|
return 0;
|
|
|
|
if (security_locked_down(LOCKDOWN_DEBUGFS))
|
|
return -EPERM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int open_proxy_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct dentry *dentry = F_DENTRY(filp);
|
|
const struct file_operations *real_fops = NULL;
|
|
int r;
|
|
|
|
r = debugfs_file_get(dentry);
|
|
if (r)
|
|
return r == -EIO ? -ENOENT : r;
|
|
|
|
real_fops = debugfs_real_fops(filp);
|
|
|
|
r = debugfs_locked_down(inode, filp, real_fops);
|
|
if (r)
|
|
goto out;
|
|
|
|
real_fops = fops_get(real_fops);
|
|
if (!real_fops) {
|
|
/* Huh? Module did not clean up after itself at exit? */
|
|
WARN(1, "debugfs file owner did not clean up at exit: %pd",
|
|
dentry);
|
|
r = -ENXIO;
|
|
goto out;
|
|
}
|
|
replace_fops(filp, real_fops);
|
|
|
|
if (real_fops->open)
|
|
r = real_fops->open(inode, filp);
|
|
|
|
out:
|
|
debugfs_file_put(dentry);
|
|
return r;
|
|
}
|
|
|
|
const struct file_operations debugfs_open_proxy_file_operations = {
|
|
.open = open_proxy_open,
|
|
};
|
|
|
|
#define PROTO(args...) args
|
|
#define ARGS(args...) args
|
|
|
|
#define FULL_PROXY_FUNC(name, ret_type, filp, proto, args) \
|
|
static ret_type full_proxy_ ## name(proto) \
|
|
{ \
|
|
struct dentry *dentry = F_DENTRY(filp); \
|
|
const struct file_operations *real_fops; \
|
|
ret_type r; \
|
|
\
|
|
r = debugfs_file_get(dentry); \
|
|
if (unlikely(r)) \
|
|
return r; \
|
|
real_fops = debugfs_real_fops(filp); \
|
|
r = real_fops->name(args); \
|
|
debugfs_file_put(dentry); \
|
|
return r; \
|
|
}
|
|
|
|
FULL_PROXY_FUNC(llseek, loff_t, filp,
|
|
PROTO(struct file *filp, loff_t offset, int whence),
|
|
ARGS(filp, offset, whence));
|
|
|
|
FULL_PROXY_FUNC(read, ssize_t, filp,
|
|
PROTO(struct file *filp, char __user *buf, size_t size,
|
|
loff_t *ppos),
|
|
ARGS(filp, buf, size, ppos));
|
|
|
|
FULL_PROXY_FUNC(write, ssize_t, filp,
|
|
PROTO(struct file *filp, const char __user *buf, size_t size,
|
|
loff_t *ppos),
|
|
ARGS(filp, buf, size, ppos));
|
|
|
|
FULL_PROXY_FUNC(unlocked_ioctl, long, filp,
|
|
PROTO(struct file *filp, unsigned int cmd, unsigned long arg),
|
|
ARGS(filp, cmd, arg));
|
|
|
|
static __poll_t full_proxy_poll(struct file *filp,
|
|
struct poll_table_struct *wait)
|
|
{
|
|
struct dentry *dentry = F_DENTRY(filp);
|
|
__poll_t r = 0;
|
|
const struct file_operations *real_fops;
|
|
|
|
if (debugfs_file_get(dentry))
|
|
return EPOLLHUP;
|
|
|
|
real_fops = debugfs_real_fops(filp);
|
|
r = real_fops->poll(filp, wait);
|
|
debugfs_file_put(dentry);
|
|
return r;
|
|
}
|
|
|
|
static int full_proxy_release(struct inode *inode, struct file *filp)
|
|
{
|
|
const struct dentry *dentry = F_DENTRY(filp);
|
|
const struct file_operations *real_fops = debugfs_real_fops(filp);
|
|
const struct file_operations *proxy_fops = filp->f_op;
|
|
int r = 0;
|
|
|
|
/*
|
|
* We must not protect this against removal races here: the
|
|
* original releaser should be called unconditionally in order
|
|
* not to leak any resources. Releasers must not assume that
|
|
* ->i_private is still being meaningful here.
|
|
*/
|
|
if (real_fops->release)
|
|
r = real_fops->release(inode, filp);
|
|
|
|
replace_fops(filp, d_inode(dentry)->i_fop);
|
|
kfree((void *)proxy_fops);
|
|
fops_put(real_fops);
|
|
return r;
|
|
}
|
|
|
|
static void __full_proxy_fops_init(struct file_operations *proxy_fops,
|
|
const struct file_operations *real_fops)
|
|
{
|
|
proxy_fops->release = full_proxy_release;
|
|
if (real_fops->llseek)
|
|
proxy_fops->llseek = full_proxy_llseek;
|
|
if (real_fops->read)
|
|
proxy_fops->read = full_proxy_read;
|
|
if (real_fops->write)
|
|
proxy_fops->write = full_proxy_write;
|
|
if (real_fops->poll)
|
|
proxy_fops->poll = full_proxy_poll;
|
|
if (real_fops->unlocked_ioctl)
|
|
proxy_fops->unlocked_ioctl = full_proxy_unlocked_ioctl;
|
|
}
|
|
|
|
static int full_proxy_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct dentry *dentry = F_DENTRY(filp);
|
|
const struct file_operations *real_fops = NULL;
|
|
struct file_operations *proxy_fops = NULL;
|
|
int r;
|
|
|
|
r = debugfs_file_get(dentry);
|
|
if (r)
|
|
return r == -EIO ? -ENOENT : r;
|
|
|
|
real_fops = debugfs_real_fops(filp);
|
|
|
|
r = debugfs_locked_down(inode, filp, real_fops);
|
|
if (r)
|
|
goto out;
|
|
|
|
real_fops = fops_get(real_fops);
|
|
if (!real_fops) {
|
|
/* Huh? Module did not cleanup after itself at exit? */
|
|
WARN(1, "debugfs file owner did not clean up at exit: %pd",
|
|
dentry);
|
|
r = -ENXIO;
|
|
goto out;
|
|
}
|
|
|
|
proxy_fops = kzalloc(sizeof(*proxy_fops), GFP_KERNEL);
|
|
if (!proxy_fops) {
|
|
r = -ENOMEM;
|
|
goto free_proxy;
|
|
}
|
|
__full_proxy_fops_init(proxy_fops, real_fops);
|
|
replace_fops(filp, proxy_fops);
|
|
|
|
if (real_fops->open) {
|
|
r = real_fops->open(inode, filp);
|
|
if (r) {
|
|
replace_fops(filp, d_inode(dentry)->i_fop);
|
|
goto free_proxy;
|
|
} else if (filp->f_op != proxy_fops) {
|
|
/* No protection against file removal anymore. */
|
|
WARN(1, "debugfs file owner replaced proxy fops: %pd",
|
|
dentry);
|
|
goto free_proxy;
|
|
}
|
|
}
|
|
|
|
goto out;
|
|
free_proxy:
|
|
kfree(proxy_fops);
|
|
fops_put(real_fops);
|
|
out:
|
|
debugfs_file_put(dentry);
|
|
return r;
|
|
}
|
|
|
|
const struct file_operations debugfs_full_proxy_file_operations = {
|
|
.open = full_proxy_open,
|
|
};
|
|
|
|
ssize_t debugfs_attr_read(struct file *file, char __user *buf,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
struct dentry *dentry = F_DENTRY(file);
|
|
ssize_t ret;
|
|
|
|
ret = debugfs_file_get(dentry);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
ret = simple_attr_read(file, buf, len, ppos);
|
|
debugfs_file_put(dentry);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_attr_read);
|
|
|
|
ssize_t debugfs_attr_write(struct file *file, const char __user *buf,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
struct dentry *dentry = F_DENTRY(file);
|
|
ssize_t ret;
|
|
|
|
ret = debugfs_file_get(dentry);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
ret = simple_attr_write(file, buf, len, ppos);
|
|
debugfs_file_put(dentry);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_attr_write);
|
|
|
|
static struct dentry *debugfs_create_mode_unsafe(const char *name, umode_t mode,
|
|
struct dentry *parent, void *value,
|
|
const struct file_operations *fops,
|
|
const struct file_operations *fops_ro,
|
|
const struct file_operations *fops_wo)
|
|
{
|
|
/* if there are no write bits set, make read only */
|
|
if (!(mode & S_IWUGO))
|
|
return debugfs_create_file_unsafe(name, mode, parent, value,
|
|
fops_ro);
|
|
/* if there are no read bits set, make write only */
|
|
if (!(mode & S_IRUGO))
|
|
return debugfs_create_file_unsafe(name, mode, parent, value,
|
|
fops_wo);
|
|
|
|
return debugfs_create_file_unsafe(name, mode, parent, value, fops);
|
|
}
|
|
|
|
static int debugfs_u8_set(void *data, u64 val)
|
|
{
|
|
*(u8 *)data = val;
|
|
return 0;
|
|
}
|
|
static int debugfs_u8_get(void *data, u64 *val)
|
|
{
|
|
*val = *(u8 *)data;
|
|
return 0;
|
|
}
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u8, debugfs_u8_get, debugfs_u8_set, "%llu\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u8_ro, debugfs_u8_get, NULL, "%llu\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u8_wo, NULL, debugfs_u8_set, "%llu\n");
|
|
|
|
/**
|
|
* debugfs_create_u8 - create a debugfs file that is used to read and write an unsigned 8-bit value
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @value: a pointer to the variable that the file should read to and write
|
|
* from.
|
|
*
|
|
* This function creates a file in debugfs with the given name that
|
|
* contains the value of the variable @value. If the @mode variable is so
|
|
* set, it can be read from, and written to.
|
|
*/
|
|
void debugfs_create_u8(const char *name, umode_t mode, struct dentry *parent,
|
|
u8 *value)
|
|
{
|
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u8,
|
|
&fops_u8_ro, &fops_u8_wo);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_u8);
|
|
|
|
static int debugfs_u16_set(void *data, u64 val)
|
|
{
|
|
*(u16 *)data = val;
|
|
return 0;
|
|
}
|
|
static int debugfs_u16_get(void *data, u64 *val)
|
|
{
|
|
*val = *(u16 *)data;
|
|
return 0;
|
|
}
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u16, debugfs_u16_get, debugfs_u16_set, "%llu\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u16_ro, debugfs_u16_get, NULL, "%llu\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u16_wo, NULL, debugfs_u16_set, "%llu\n");
|
|
|
|
/**
|
|
* debugfs_create_u16 - create a debugfs file that is used to read and write an unsigned 16-bit value
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @value: a pointer to the variable that the file should read to and write
|
|
* from.
|
|
*
|
|
* This function creates a file in debugfs with the given name that
|
|
* contains the value of the variable @value. If the @mode variable is so
|
|
* set, it can be read from, and written to.
|
|
*/
|
|
void debugfs_create_u16(const char *name, umode_t mode, struct dentry *parent,
|
|
u16 *value)
|
|
{
|
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u16,
|
|
&fops_u16_ro, &fops_u16_wo);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_u16);
|
|
|
|
static int debugfs_u32_set(void *data, u64 val)
|
|
{
|
|
*(u32 *)data = val;
|
|
return 0;
|
|
}
|
|
static int debugfs_u32_get(void *data, u64 *val)
|
|
{
|
|
*val = *(u32 *)data;
|
|
return 0;
|
|
}
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u32, debugfs_u32_get, debugfs_u32_set, "%llu\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u32_ro, debugfs_u32_get, NULL, "%llu\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u32_wo, NULL, debugfs_u32_set, "%llu\n");
|
|
|
|
/**
|
|
* debugfs_create_u32 - create a debugfs file that is used to read and write an unsigned 32-bit value
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @value: a pointer to the variable that the file should read to and write
|
|
* from.
|
|
*
|
|
* This function creates a file in debugfs with the given name that
|
|
* contains the value of the variable @value. If the @mode variable is so
|
|
* set, it can be read from, and written to.
|
|
*
|
|
* This function will return a pointer to a dentry if it succeeds. This
|
|
* pointer must be passed to the debugfs_remove() function when the file is
|
|
* to be removed (no automatic cleanup happens if your module is unloaded,
|
|
* you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be
|
|
* returned.
|
|
*
|
|
* If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will
|
|
* be returned.
|
|
*/
|
|
struct dentry *debugfs_create_u32(const char *name, umode_t mode,
|
|
struct dentry *parent, u32 *value)
|
|
{
|
|
return debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u32,
|
|
&fops_u32_ro, &fops_u32_wo);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_u32);
|
|
|
|
static int debugfs_u64_set(void *data, u64 val)
|
|
{
|
|
*(u64 *)data = val;
|
|
return 0;
|
|
}
|
|
|
|
static int debugfs_u64_get(void *data, u64 *val)
|
|
{
|
|
*val = *(u64 *)data;
|
|
return 0;
|
|
}
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u64, debugfs_u64_get, debugfs_u64_set, "%llu\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u64_ro, debugfs_u64_get, NULL, "%llu\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u64_wo, NULL, debugfs_u64_set, "%llu\n");
|
|
|
|
/**
|
|
* debugfs_create_u64 - create a debugfs file that is used to read and write an unsigned 64-bit value
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @value: a pointer to the variable that the file should read to and write
|
|
* from.
|
|
*
|
|
* This function creates a file in debugfs with the given name that
|
|
* contains the value of the variable @value. If the @mode variable is so
|
|
* set, it can be read from, and written to.
|
|
*/
|
|
void debugfs_create_u64(const char *name, umode_t mode, struct dentry *parent,
|
|
u64 *value)
|
|
{
|
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u64,
|
|
&fops_u64_ro, &fops_u64_wo);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_u64);
|
|
|
|
static int debugfs_ulong_set(void *data, u64 val)
|
|
{
|
|
*(unsigned long *)data = val;
|
|
return 0;
|
|
}
|
|
|
|
static int debugfs_ulong_get(void *data, u64 *val)
|
|
{
|
|
*val = *(unsigned long *)data;
|
|
return 0;
|
|
}
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_ulong, debugfs_ulong_get, debugfs_ulong_set,
|
|
"%llu\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_ulong_ro, debugfs_ulong_get, NULL, "%llu\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_ulong_wo, NULL, debugfs_ulong_set, "%llu\n");
|
|
|
|
/**
|
|
* debugfs_create_ulong - create a debugfs file that is used to read and write
|
|
* an unsigned long value.
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @value: a pointer to the variable that the file should read to and write
|
|
* from.
|
|
*
|
|
* This function creates a file in debugfs with the given name that
|
|
* contains the value of the variable @value. If the @mode variable is so
|
|
* set, it can be read from, and written to.
|
|
*
|
|
* This function will return a pointer to a dentry if it succeeds. This
|
|
* pointer must be passed to the debugfs_remove() function when the file is
|
|
* to be removed (no automatic cleanup happens if your module is unloaded,
|
|
* you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be
|
|
* returned.
|
|
*
|
|
* If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will
|
|
* be returned.
|
|
*/
|
|
struct dentry *debugfs_create_ulong(const char *name, umode_t mode,
|
|
struct dentry *parent, unsigned long *value)
|
|
{
|
|
return debugfs_create_mode_unsafe(name, mode, parent, value,
|
|
&fops_ulong, &fops_ulong_ro,
|
|
&fops_ulong_wo);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_ulong);
|
|
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x8, debugfs_u8_get, debugfs_u8_set, "0x%02llx\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x8_ro, debugfs_u8_get, NULL, "0x%02llx\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x8_wo, NULL, debugfs_u8_set, "0x%02llx\n");
|
|
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x16, debugfs_u16_get, debugfs_u16_set,
|
|
"0x%04llx\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x16_ro, debugfs_u16_get, NULL, "0x%04llx\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x16_wo, NULL, debugfs_u16_set, "0x%04llx\n");
|
|
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x32, debugfs_u32_get, debugfs_u32_set,
|
|
"0x%08llx\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x32_ro, debugfs_u32_get, NULL, "0x%08llx\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x32_wo, NULL, debugfs_u32_set, "0x%08llx\n");
|
|
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x64, debugfs_u64_get, debugfs_u64_set,
|
|
"0x%016llx\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x64_ro, debugfs_u64_get, NULL, "0x%016llx\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x64_wo, NULL, debugfs_u64_set, "0x%016llx\n");
|
|
|
|
/*
|
|
* debugfs_create_x{8,16,32,64} - create a debugfs file that is used to read and write an unsigned {8,16,32,64}-bit value
|
|
*
|
|
* These functions are exactly the same as the above functions (but use a hex
|
|
* output for the decimal challenged). For details look at the above unsigned
|
|
* decimal functions.
|
|
*/
|
|
|
|
/**
|
|
* debugfs_create_x8 - create a debugfs file that is used to read and write an unsigned 8-bit value
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @value: a pointer to the variable that the file should read to and write
|
|
* from.
|
|
*/
|
|
void debugfs_create_x8(const char *name, umode_t mode, struct dentry *parent,
|
|
u8 *value)
|
|
{
|
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x8,
|
|
&fops_x8_ro, &fops_x8_wo);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_x8);
|
|
|
|
/**
|
|
* debugfs_create_x16 - create a debugfs file that is used to read and write an unsigned 16-bit value
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @value: a pointer to the variable that the file should read to and write
|
|
* from.
|
|
*/
|
|
void debugfs_create_x16(const char *name, umode_t mode, struct dentry *parent,
|
|
u16 *value)
|
|
{
|
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x16,
|
|
&fops_x16_ro, &fops_x16_wo);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_x16);
|
|
|
|
/**
|
|
* debugfs_create_x32 - create a debugfs file that is used to read and write an unsigned 32-bit value
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @value: a pointer to the variable that the file should read to and write
|
|
* from.
|
|
*/
|
|
void debugfs_create_x32(const char *name, umode_t mode, struct dentry *parent,
|
|
u32 *value)
|
|
{
|
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x32,
|
|
&fops_x32_ro, &fops_x32_wo);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_x32);
|
|
|
|
/**
|
|
* debugfs_create_x64 - create a debugfs file that is used to read and write an unsigned 64-bit value
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @value: a pointer to the variable that the file should read to and write
|
|
* from.
|
|
*/
|
|
void debugfs_create_x64(const char *name, umode_t mode, struct dentry *parent,
|
|
u64 *value)
|
|
{
|
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x64,
|
|
&fops_x64_ro, &fops_x64_wo);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_x64);
|
|
|
|
|
|
static int debugfs_size_t_set(void *data, u64 val)
|
|
{
|
|
*(size_t *)data = val;
|
|
return 0;
|
|
}
|
|
static int debugfs_size_t_get(void *data, u64 *val)
|
|
{
|
|
*val = *(size_t *)data;
|
|
return 0;
|
|
}
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_size_t, debugfs_size_t_get, debugfs_size_t_set,
|
|
"%llu\n"); /* %llu and %zu are more or less the same */
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_size_t_ro, debugfs_size_t_get, NULL, "%llu\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_size_t_wo, NULL, debugfs_size_t_set, "%llu\n");
|
|
|
|
/**
|
|
* debugfs_create_size_t - create a debugfs file that is used to read and write an size_t value
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @value: a pointer to the variable that the file should read to and write
|
|
* from.
|
|
*/
|
|
void debugfs_create_size_t(const char *name, umode_t mode,
|
|
struct dentry *parent, size_t *value)
|
|
{
|
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_size_t,
|
|
&fops_size_t_ro, &fops_size_t_wo);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_size_t);
|
|
|
|
static int debugfs_atomic_t_set(void *data, u64 val)
|
|
{
|
|
atomic_set((atomic_t *)data, val);
|
|
return 0;
|
|
}
|
|
static int debugfs_atomic_t_get(void *data, u64 *val)
|
|
{
|
|
*val = atomic_read((atomic_t *)data);
|
|
return 0;
|
|
}
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t, debugfs_atomic_t_get,
|
|
debugfs_atomic_t_set, "%lld\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t_ro, debugfs_atomic_t_get, NULL,
|
|
"%lld\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t_wo, NULL, debugfs_atomic_t_set,
|
|
"%lld\n");
|
|
|
|
/**
|
|
* debugfs_create_atomic_t - create a debugfs file that is used to read and
|
|
* write an atomic_t value
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @value: a pointer to the variable that the file should read to and write
|
|
* from.
|
|
*/
|
|
void debugfs_create_atomic_t(const char *name, umode_t mode,
|
|
struct dentry *parent, atomic_t *value)
|
|
{
|
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_atomic_t,
|
|
&fops_atomic_t_ro, &fops_atomic_t_wo);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_atomic_t);
|
|
|
|
ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char buf[3];
|
|
bool val;
|
|
int r;
|
|
struct dentry *dentry = F_DENTRY(file);
|
|
|
|
r = debugfs_file_get(dentry);
|
|
if (unlikely(r))
|
|
return r;
|
|
val = *(bool *)file->private_data;
|
|
debugfs_file_put(dentry);
|
|
|
|
if (val)
|
|
buf[0] = 'Y';
|
|
else
|
|
buf[0] = 'N';
|
|
buf[1] = '\n';
|
|
buf[2] = 0x00;
|
|
return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_read_file_bool);
|
|
|
|
ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
bool bv;
|
|
int r;
|
|
bool *val = file->private_data;
|
|
struct dentry *dentry = F_DENTRY(file);
|
|
|
|
r = kstrtobool_from_user(user_buf, count, &bv);
|
|
if (!r) {
|
|
r = debugfs_file_get(dentry);
|
|
if (unlikely(r))
|
|
return r;
|
|
*val = bv;
|
|
debugfs_file_put(dentry);
|
|
}
|
|
|
|
return count;
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_write_file_bool);
|
|
|
|
static const struct file_operations fops_bool = {
|
|
.read = debugfs_read_file_bool,
|
|
.write = debugfs_write_file_bool,
|
|
.open = simple_open,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
static const struct file_operations fops_bool_ro = {
|
|
.read = debugfs_read_file_bool,
|
|
.open = simple_open,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
static const struct file_operations fops_bool_wo = {
|
|
.write = debugfs_write_file_bool,
|
|
.open = simple_open,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
/**
|
|
* debugfs_create_bool - create a debugfs file that is used to read and write a boolean value
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @value: a pointer to the variable that the file should read to and write
|
|
* from.
|
|
*
|
|
* This function creates a file in debugfs with the given name that
|
|
* contains the value of the variable @value. If the @mode variable is so
|
|
* set, it can be read from, and written to.
|
|
*
|
|
* This function will return a pointer to a dentry if it succeeds. This
|
|
* pointer must be passed to the debugfs_remove() function when the file is
|
|
* to be removed (no automatic cleanup happens if your module is unloaded,
|
|
* you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be
|
|
* returned.
|
|
*
|
|
* If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will
|
|
* be returned.
|
|
*/
|
|
struct dentry *debugfs_create_bool(const char *name, umode_t mode,
|
|
struct dentry *parent, bool *value)
|
|
{
|
|
return debugfs_create_mode_unsafe(name, mode, parent, value, &fops_bool,
|
|
&fops_bool_ro, &fops_bool_wo);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_bool);
|
|
|
|
static ssize_t read_file_blob(struct file *file, char __user *user_buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct debugfs_blob_wrapper *blob = file->private_data;
|
|
struct dentry *dentry = F_DENTRY(file);
|
|
ssize_t r;
|
|
|
|
r = debugfs_file_get(dentry);
|
|
if (unlikely(r))
|
|
return r;
|
|
r = simple_read_from_buffer(user_buf, count, ppos, blob->data,
|
|
blob->size);
|
|
debugfs_file_put(dentry);
|
|
return r;
|
|
}
|
|
|
|
static const struct file_operations fops_blob = {
|
|
.read = read_file_blob,
|
|
.open = simple_open,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
/**
|
|
* debugfs_create_blob - create a debugfs file that is used to read a binary blob
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @blob: a pointer to a struct debugfs_blob_wrapper which contains a pointer
|
|
* to the blob data and the size of the data.
|
|
*
|
|
* This function creates a file in debugfs with the given name that exports
|
|
* @blob->data as a binary blob. If the @mode variable is so set it can be
|
|
* read from. Writing is not supported.
|
|
*
|
|
* This function will return a pointer to a dentry if it succeeds. This
|
|
* pointer must be passed to the debugfs_remove() function when the file is
|
|
* to be removed (no automatic cleanup happens if your module is unloaded,
|
|
* you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be
|
|
* returned.
|
|
*
|
|
* If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will
|
|
* be returned.
|
|
*/
|
|
struct dentry *debugfs_create_blob(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
struct debugfs_blob_wrapper *blob)
|
|
{
|
|
return debugfs_create_file_unsafe(name, mode, parent, blob, &fops_blob);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_blob);
|
|
|
|
struct array_data {
|
|
void *array;
|
|
u32 elements;
|
|
};
|
|
|
|
static size_t u32_format_array(char *buf, size_t bufsize,
|
|
u32 *array, int array_size)
|
|
{
|
|
size_t ret = 0;
|
|
|
|
while (--array_size >= 0) {
|
|
size_t len;
|
|
char term = array_size ? ' ' : '\n';
|
|
|
|
len = snprintf(buf, bufsize, "%u%c", *array++, term);
|
|
ret += len;
|
|
|
|
buf += len;
|
|
bufsize -= len;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int u32_array_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct array_data *data = inode->i_private;
|
|
int size, elements = data->elements;
|
|
char *buf;
|
|
|
|
/*
|
|
* Max size:
|
|
* - 10 digits + ' '/'\n' = 11 bytes per number
|
|
* - terminating NUL character
|
|
*/
|
|
size = elements*11;
|
|
buf = kmalloc(size+1, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
buf[size] = 0;
|
|
|
|
file->private_data = buf;
|
|
u32_format_array(buf, size, data->array, data->elements);
|
|
|
|
return nonseekable_open(inode, file);
|
|
}
|
|
|
|
static ssize_t u32_array_read(struct file *file, char __user *buf, size_t len,
|
|
loff_t *ppos)
|
|
{
|
|
size_t size = strlen(file->private_data);
|
|
|
|
return simple_read_from_buffer(buf, len, ppos,
|
|
file->private_data, size);
|
|
}
|
|
|
|
static int u32_array_release(struct inode *inode, struct file *file)
|
|
{
|
|
kfree(file->private_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations u32_array_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = u32_array_open,
|
|
.release = u32_array_release,
|
|
.read = u32_array_read,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
/**
|
|
* debugfs_create_u32_array - create a debugfs file that is used to read u32
|
|
* array.
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have.
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @array: u32 array that provides data.
|
|
* @elements: total number of elements in the array.
|
|
*
|
|
* This function creates a file in debugfs with the given name that exports
|
|
* @array as data. If the @mode variable is so set it can be read from.
|
|
* Writing is not supported. Seek within the file is also not supported.
|
|
* Once array is created its size can not be changed.
|
|
*/
|
|
void debugfs_create_u32_array(const char *name, umode_t mode,
|
|
struct dentry *parent, u32 *array, u32 elements)
|
|
{
|
|
struct array_data *data = kmalloc(sizeof(*data), GFP_KERNEL);
|
|
|
|
if (data == NULL)
|
|
return;
|
|
|
|
data->array = array;
|
|
data->elements = elements;
|
|
|
|
debugfs_create_file_unsafe(name, mode, parent, data, &u32_array_fops);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_u32_array);
|
|
|
|
#ifdef CONFIG_HAS_IOMEM
|
|
|
|
/*
|
|
* The regset32 stuff is used to print 32-bit registers using the
|
|
* seq_file utilities. We offer printing a register set in an already-opened
|
|
* sequential file or create a debugfs file that only prints a regset32.
|
|
*/
|
|
|
|
/**
|
|
* debugfs_print_regs32 - use seq_print to describe a set of registers
|
|
* @s: the seq_file structure being used to generate output
|
|
* @regs: an array if struct debugfs_reg32 structures
|
|
* @nregs: the length of the above array
|
|
* @base: the base address to be used in reading the registers
|
|
* @prefix: a string to be prefixed to every output line
|
|
*
|
|
* This function outputs a text block describing the current values of
|
|
* some 32-bit hardware registers. It is meant to be used within debugfs
|
|
* files based on seq_file that need to show registers, intermixed with other
|
|
* information. The prefix argument may be used to specify a leading string,
|
|
* because some peripherals have several blocks of identical registers,
|
|
* for example configuration of dma channels
|
|
*/
|
|
void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
|
|
int nregs, void __iomem *base, char *prefix)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nregs; i++, regs++) {
|
|
if (prefix)
|
|
seq_printf(s, "%s", prefix);
|
|
seq_printf(s, "%s = 0x%08x\n", regs->name,
|
|
readl(base + regs->offset));
|
|
if (seq_has_overflowed(s))
|
|
break;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_print_regs32);
|
|
|
|
static int debugfs_show_regset32(struct seq_file *s, void *data)
|
|
{
|
|
struct debugfs_regset32 *regset = s->private;
|
|
|
|
debugfs_print_regs32(s, regset->regs, regset->nregs, regset->base, "");
|
|
return 0;
|
|
}
|
|
|
|
static int debugfs_open_regset32(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, debugfs_show_regset32, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations fops_regset32 = {
|
|
.open = debugfs_open_regset32,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
/**
|
|
* debugfs_create_regset32 - create a debugfs file that returns register values
|
|
* @name: a pointer to a string containing the name of the file to create.
|
|
* @mode: the permission that the file should have
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @regset: a pointer to a struct debugfs_regset32, which contains a pointer
|
|
* to an array of register definitions, the array size and the base
|
|
* address where the register bank is to be found.
|
|
*
|
|
* This function creates a file in debugfs with the given name that reports
|
|
* the names and values of a set of 32-bit registers. If the @mode variable
|
|
* is so set it can be read from. Writing is not supported.
|
|
*/
|
|
void debugfs_create_regset32(const char *name, umode_t mode,
|
|
struct dentry *parent,
|
|
struct debugfs_regset32 *regset)
|
|
{
|
|
debugfs_create_file(name, mode, parent, regset, &fops_regset32);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_regset32);
|
|
|
|
#endif /* CONFIG_HAS_IOMEM */
|
|
|
|
struct debugfs_devm_entry {
|
|
int (*read)(struct seq_file *seq, void *data);
|
|
struct device *dev;
|
|
};
|
|
|
|
static int debugfs_devm_entry_open(struct inode *inode, struct file *f)
|
|
{
|
|
struct debugfs_devm_entry *entry = inode->i_private;
|
|
|
|
return single_open(f, entry->read, entry->dev);
|
|
}
|
|
|
|
static const struct file_operations debugfs_devm_entry_ops = {
|
|
.owner = THIS_MODULE,
|
|
.open = debugfs_devm_entry_open,
|
|
.release = single_release,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek
|
|
};
|
|
|
|
/**
|
|
* debugfs_create_devm_seqfile - create a debugfs file that is bound to device.
|
|
*
|
|
* @dev: device related to this debugfs file.
|
|
* @name: name of the debugfs file.
|
|
* @parent: a pointer to the parent dentry for this file. This should be a
|
|
* directory dentry if set. If this parameter is %NULL, then the
|
|
* file will be created in the root of the debugfs filesystem.
|
|
* @read_fn: function pointer called to print the seq_file content.
|
|
*/
|
|
struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name,
|
|
struct dentry *parent,
|
|
int (*read_fn)(struct seq_file *s,
|
|
void *data))
|
|
{
|
|
struct debugfs_devm_entry *entry;
|
|
|
|
if (IS_ERR(parent))
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
entry = devm_kzalloc(dev, sizeof(*entry), GFP_KERNEL);
|
|
if (!entry)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
entry->read = read_fn;
|
|
entry->dev = dev;
|
|
|
|
return debugfs_create_file(name, S_IRUGO, parent, entry,
|
|
&debugfs_devm_entry_ops);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_create_devm_seqfile);
|