1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
// SPDX-License-Identifier: GPL-2.0
/*
* 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.
*
* Please read Documentation/core-api/kobject.rst 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/container_of.h>
#include <linux/spinlock.h>
#include <linux/kref.h>
#include <linux/kobject_ns.h>
#include <linux/wait.h>
#include <linux/atomic.h>
#include <linux/workqueue.h>
#include <linux/uidgid.h>
#define UEVENT_HELPER_PATH_LEN 256
#define UEVENT_NUM_ENVP 64 /* number of env pointers */
#define UEVENT_BUFFER_SIZE 2048 /* buffer for the variables */
#ifdef CONFIG_UEVENT_HELPER
/* path to the userspace helper executed on an event */
extern char uevent_helper[];
#endif
/* 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_BIND,
KOBJ_UNBIND,
};
struct kobject {
const char *name;
struct list_head entry;
struct kobject *parent;
struct kset *kset;
const struct kobj_type *ktype;
struct kernfs_node *sd; /* sysfs directory entry */
struct kref kref;
#ifdef CONFIG_DEBUG_KOBJECT_RELEASE
struct delayed_work release;
#endif
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;
};
__printf(2, 3) int kobject_set_name(struct kobject *kobj, const char *name, ...);
__printf(2, 0) 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;
}
void kobject_init(struct kobject *kobj, const struct kobj_type *ktype);
__printf(3, 4) __must_check int kobject_add(struct kobject *kobj,
struct kobject *parent,
const char *fmt, ...);
__printf(4, 5) __must_check int kobject_init_and_add(struct kobject *kobj,
const struct kobj_type *ktype,
struct kobject *parent,
const char *fmt, ...);
void kobject_del(struct kobject *kobj);
struct kobject * __must_check kobject_create_and_add(const char *name, struct kobject *parent);
int __must_check kobject_rename(struct kobject *, const char *new_name);
int __must_check kobject_move(struct kobject *, struct kobject *);
struct kobject *kobject_get(struct kobject *kobj);
struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj);
void kobject_put(struct kobject *kobj);
const void *kobject_namespace(const struct kobject *kobj);
void kobject_get_ownership(const struct kobject *kobj, kuid_t *uid, kgid_t *gid);
char *kobject_get_path(const struct kobject *kobj, gfp_t flag);
struct kobj_type {
void (*release)(struct kobject *kobj);
const struct sysfs_ops *sysfs_ops;
const struct attribute_group **default_groups;
const struct kobj_ns_type_operations *(*child_ns_type)(const struct kobject *kobj);
const void *(*namespace)(const struct kobject *kobj);
void (*get_ownership)(const struct kobject *kobj, kuid_t *uid, kgid_t *gid);
};
struct kobj_uevent_env {
char *argv[3];
char *envp[UEVENT_NUM_ENVP];
int envp_idx;
char buf[UEVENT_BUFFER_SIZE];
int buflen;
};
struct kset_uevent_ops {
int (* const filter)(const struct kobject *kobj);
const char *(* const name)(const struct kobject *kobj);
int (* const uevent)(const 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 const struct sysfs_ops kobj_sysfs_ops;
struct sock;
/**
* 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;
const struct kset_uevent_ops *uevent_ops;
} __randomize_layout;
void kset_init(struct kset *kset);
int __must_check kset_register(struct kset *kset);
void kset_unregister(struct kset *kset);
struct kset * __must_check kset_create_and_add(const char *name, const 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 const struct kobj_type *get_ktype(const struct kobject *kobj)
{
return kobj->ktype;
}
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;
int kobject_uevent(struct kobject *kobj, enum kobject_action action);
int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
char *envp[]);
int kobject_synth_uevent(struct kobject *kobj, const char *buf, size_t count);
__printf(2, 3)
int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...);
#endif /* _KOBJECT_H_ */
|
