kernel-ark/include/linux/kobject.h
Ming Lei f67f129e51 Driver core: implement uevent suppress in kobject
This patch implements uevent suppress in kobject and removes it
from struct device, based on the following ideas:

1,Uevent sending should be one attribute of kobject, so suppressing it
in kobject layer is more natural than in device layer. By this way,
we can do it for other objects embedded with kobject.

2,It may save several bytes for each instance of struct device.(On my
omap3(32bit ARM) based box, can save 8bytes per device object)

This patch also introduces dev_set|get_uevent_suppress() helpers to
set and query uevent_suppress attribute in case to help kobject
as private part of struct device in future.

[This version is against the latest driver-core patch set of Greg,please
ignore the last version.]

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-03-24 16:38:26 -07:00

230 lines
6.9 KiB
C

/*
* kobject.h - generic kernel object infrastructure.
*
* Copyright (c) 2002-2003 Patrick Mochel
* Copyright (c) 2002-2003 Open Source Development Labs
* Copyright (c) 2006-2008 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (c) 2006-2008 Novell Inc.
*
* This file is released under the GPLv2.
*
* Please read Documentation/kobject.txt before using the kobject
* interface, ESPECIALLY the parts about reference counts and object
* destructors.
*/
#ifndef _KOBJECT_H_
#define _KOBJECT_H_
#include <linux/types.h>
#include <linux/list.h>
#include <linux/sysfs.h>
#include <linux/compiler.h>
#include <linux/spinlock.h>
#include <linux/kref.h>
#include <linux/kernel.h>
#include <linux/wait.h>
#include <asm/atomic.h>
#define UEVENT_HELPER_PATH_LEN 256
#define UEVENT_NUM_ENVP 32 /* number of env pointers */
#define UEVENT_BUFFER_SIZE 2048 /* buffer for the variables */
/* path to the userspace helper executed on an event */
extern char uevent_helper[];
/* counter to tag the uevent, read only except for the kobject core */
extern u64 uevent_seqnum;
/*
* The actions here must match the index to the string array
* in lib/kobject_uevent.c
*
* Do not add new actions here without checking with the driver-core
* maintainers. Action strings are not meant to express subsystem
* or device specific properties. In most cases you want to send a
* kobject_uevent_env(kobj, KOBJ_CHANGE, env) with additional event
* specific variables added to the event environment.
*/
enum kobject_action {
KOBJ_ADD,
KOBJ_REMOVE,
KOBJ_CHANGE,
KOBJ_MOVE,
KOBJ_ONLINE,
KOBJ_OFFLINE,
KOBJ_MAX
};
struct kobject {
const char *name;
struct list_head entry;
struct kobject *parent;
struct kset *kset;
struct kobj_type *ktype;
struct sysfs_dirent *sd;
struct kref kref;
unsigned int state_initialized:1;
unsigned int state_in_sysfs:1;
unsigned int state_add_uevent_sent:1;
unsigned int state_remove_uevent_sent:1;
unsigned int uevent_suppress:1;
};
extern int kobject_set_name(struct kobject *kobj, const char *name, ...)
__attribute__((format(printf, 2, 3)));
extern int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
va_list vargs);
static inline const char *kobject_name(const struct kobject *kobj)
{
return kobj->name;
}
extern void kobject_init(struct kobject *kobj, struct kobj_type *ktype);
extern int __must_check kobject_add(struct kobject *kobj,
struct kobject *parent,
const char *fmt, ...);
extern int __must_check kobject_init_and_add(struct kobject *kobj,
struct kobj_type *ktype,
struct kobject *parent,
const char *fmt, ...);
extern void kobject_del(struct kobject *kobj);
extern struct kobject * __must_check kobject_create(void);
extern struct kobject * __must_check kobject_create_and_add(const char *name,
struct kobject *parent);
extern int __must_check kobject_rename(struct kobject *, const char *new_name);
extern int __must_check kobject_move(struct kobject *, struct kobject *);
extern struct kobject *kobject_get(struct kobject *kobj);
extern void kobject_put(struct kobject *kobj);
extern char *kobject_get_path(struct kobject *kobj, gfp_t flag);
struct kobj_type {
void (*release)(struct kobject *kobj);
struct sysfs_ops *sysfs_ops;
struct attribute **default_attrs;
};
struct kobj_uevent_env {
char *envp[UEVENT_NUM_ENVP];
int envp_idx;
char buf[UEVENT_BUFFER_SIZE];
int buflen;
};
struct kset_uevent_ops {
int (*filter)(struct kset *kset, struct kobject *kobj);
const char *(*name)(struct kset *kset, struct kobject *kobj);
int (*uevent)(struct kset *kset, struct kobject *kobj,
struct kobj_uevent_env *env);
};
struct kobj_attribute {
struct attribute attr;
ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,
char *buf);
ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t count);
};
extern struct sysfs_ops kobj_sysfs_ops;
/**
* struct kset - a set of kobjects of a specific type, belonging to a specific subsystem.
*
* A kset defines a group of kobjects. They can be individually
* different "types" but overall these kobjects all want to be grouped
* together and operated on in the same manner. ksets are used to
* define the attribute callbacks and other common events that happen to
* a kobject.
*
* @list: the list of all kobjects for this kset
* @list_lock: a lock for iterating over the kobjects
* @kobj: the embedded kobject for this kset (recursion, isn't it fun...)
* @uevent_ops: the set of uevent operations for this kset. These are
* called whenever a kobject has something happen to it so that the kset
* can add new environment variables, or filter out the uevents if so
* desired.
*/
struct kset {
struct list_head list;
spinlock_t list_lock;
struct kobject kobj;
struct kset_uevent_ops *uevent_ops;
};
extern void kset_init(struct kset *kset);
extern int __must_check kset_register(struct kset *kset);
extern void kset_unregister(struct kset *kset);
extern struct kset * __must_check kset_create_and_add(const char *name,
struct kset_uevent_ops *u,
struct kobject *parent_kobj);
static inline struct kset *to_kset(struct kobject *kobj)
{
return kobj ? container_of(kobj, struct kset, kobj) : NULL;
}
static inline struct kset *kset_get(struct kset *k)
{
return k ? to_kset(kobject_get(&k->kobj)) : NULL;
}
static inline void kset_put(struct kset *k)
{
kobject_put(&k->kobj);
}
static inline struct kobj_type *get_ktype(struct kobject *kobj)
{
return kobj->ktype;
}
extern struct kobject *kset_find_obj(struct kset *, const char *);
/* The global /sys/kernel/ kobject for people to chain off of */
extern struct kobject *kernel_kobj;
/* The global /sys/kernel/mm/ kobject for people to chain off of */
extern struct kobject *mm_kobj;
/* The global /sys/hypervisor/ kobject for people to chain off of */
extern struct kobject *hypervisor_kobj;
/* The global /sys/power/ kobject for people to chain off of */
extern struct kobject *power_kobj;
/* The global /sys/firmware/ kobject for people to chain off of */
extern struct kobject *firmware_kobj;
#if defined(CONFIG_HOTPLUG)
int kobject_uevent(struct kobject *kobj, enum kobject_action action);
int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
char *envp[]);
int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
__attribute__((format (printf, 2, 3)));
int kobject_action_type(const char *buf, size_t count,
enum kobject_action *type);
#else
static inline int kobject_uevent(struct kobject *kobj,
enum kobject_action action)
{ return 0; }
static inline int kobject_uevent_env(struct kobject *kobj,
enum kobject_action action,
char *envp[])
{ return 0; }
static inline int add_uevent_var(struct kobj_uevent_env *env,
const char *format, ...)
{ return 0; }
static inline int kobject_action_type(const char *buf, size_t count,
enum kobject_action *type)
{ return -EINVAL; }
#endif
#endif /* _KOBJECT_H_ */