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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * kobject.h - generic kernel object infrastructure.
4 *
5 * Copyright (c) 2002-2003 Patrick Mochel
6 * Copyright (c) 2002-2003 Open Source Development Labs
7 * Copyright (c) 2006-2008 Greg Kroah-Hartman <greg@kroah.com>
8 * Copyright (c) 2006-2008 Novell Inc.
9 *
10 * Please read Documentation/core-api/kobject.rst before using the kobject
11 * interface, ESPECIALLY the parts about reference counts and object
12 * destructors.
13 */
14
15#ifndef _KOBJECT_H_
16#define _KOBJECT_H_
17
18#include <linux/types.h>
19#include <linux/list.h>
20#include <linux/sysfs.h>
21#include <linux/compiler.h>
22#include <linux/container_of.h>
23#include <linux/spinlock.h>
24#include <linux/kref.h>
25#include <linux/kobject_ns.h>
26#include <linux/wait.h>
27#include <linux/atomic.h>
28#include <linux/workqueue.h>
29#include <linux/uidgid.h>
30
31#define UEVENT_HELPER_PATH_LEN 256
32#define UEVENT_NUM_ENVP 64 /* number of env pointers */
33#define UEVENT_BUFFER_SIZE 2048 /* buffer for the variables */
34
35#ifdef CONFIG_UEVENT_HELPER
36/* path to the userspace helper executed on an event */
37extern char uevent_helper[];
38#endif
39
40/* counter to tag the uevent, read only except for the kobject core */
41extern u64 uevent_seqnum;
42
43/*
44 * The actions here must match the index to the string array
45 * in lib/kobject_uevent.c
46 *
47 * Do not add new actions here without checking with the driver-core
48 * maintainers. Action strings are not meant to express subsystem
49 * or device specific properties. In most cases you want to send a
50 * kobject_uevent_env(kobj, KOBJ_CHANGE, env) with additional event
51 * specific variables added to the event environment.
52 */
53enum kobject_action {
54 KOBJ_ADD,
55 KOBJ_REMOVE,
56 KOBJ_CHANGE,
57 KOBJ_MOVE,
58 KOBJ_ONLINE,
59 KOBJ_OFFLINE,
60 KOBJ_BIND,
61 KOBJ_UNBIND,
62};
63
64struct kobject {
65 const char *name;
66 struct list_head entry;
67 struct kobject *parent;
68 struct kset *kset;
69 const struct kobj_type *ktype;
70 struct kernfs_node *sd; /* sysfs directory entry */
71 struct kref kref;
72#ifdef CONFIG_DEBUG_KOBJECT_RELEASE
73 struct delayed_work release;
74#endif
75 unsigned int state_initialized:1;
76 unsigned int state_in_sysfs:1;
77 unsigned int state_add_uevent_sent:1;
78 unsigned int state_remove_uevent_sent:1;
79 unsigned int uevent_suppress:1;
80};
81
82extern __printf(2, 3)
83int kobject_set_name(struct kobject *kobj, const char *name, ...);
84extern __printf(2, 0)
85int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
86 va_list vargs);
87
88static inline const char *kobject_name(const struct kobject *kobj)
89{
90 return kobj->name;
91}
92
93extern void kobject_init(struct kobject *kobj, const struct kobj_type *ktype);
94extern __printf(3, 4) __must_check
95int kobject_add(struct kobject *kobj, struct kobject *parent,
96 const char *fmt, ...);
97extern __printf(4, 5) __must_check
98int kobject_init_and_add(struct kobject *kobj,
99 const struct kobj_type *ktype, struct kobject *parent,
100 const char *fmt, ...);
101
102extern void kobject_del(struct kobject *kobj);
103
104extern struct kobject * __must_check kobject_create_and_add(const char *name,
105 struct kobject *parent);
106
107extern int __must_check kobject_rename(struct kobject *, const char *new_name);
108extern int __must_check kobject_move(struct kobject *, struct kobject *);
109
110extern struct kobject *kobject_get(struct kobject *kobj);
111extern struct kobject * __must_check kobject_get_unless_zero(
112 struct kobject *kobj);
113extern void kobject_put(struct kobject *kobj);
114
115extern const void *kobject_namespace(struct kobject *kobj);
116extern void kobject_get_ownership(struct kobject *kobj,
117 kuid_t *uid, kgid_t *gid);
118extern char *kobject_get_path(struct kobject *kobj, gfp_t flag);
119
120struct kobj_type {
121 void (*release)(struct kobject *kobj);
122 const struct sysfs_ops *sysfs_ops;
123 struct attribute **default_attrs; /* use default_groups instead */
124 const struct attribute_group **default_groups;
125 const struct kobj_ns_type_operations *(*child_ns_type)(struct kobject *kobj);
126 const void *(*namespace)(struct kobject *kobj);
127 void (*get_ownership)(struct kobject *kobj, kuid_t *uid, kgid_t *gid);
128};
129
130struct kobj_uevent_env {
131 char *argv[3];
132 char *envp[UEVENT_NUM_ENVP];
133 int envp_idx;
134 char buf[UEVENT_BUFFER_SIZE];
135 int buflen;
136};
137
138struct kset_uevent_ops {
139 int (* const filter)(struct kobject *kobj);
140 const char *(* const name)(struct kobject *kobj);
141 int (* const uevent)(struct kobject *kobj, struct kobj_uevent_env *env);
142};
143
144struct kobj_attribute {
145 struct attribute attr;
146 ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,
147 char *buf);
148 ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr,
149 const char *buf, size_t count);
150};
151
152extern const struct sysfs_ops kobj_sysfs_ops;
153
154struct sock;
155
156/**
157 * struct kset - a set of kobjects of a specific type, belonging to a specific subsystem.
158 *
159 * A kset defines a group of kobjects. They can be individually
160 * different "types" but overall these kobjects all want to be grouped
161 * together and operated on in the same manner. ksets are used to
162 * define the attribute callbacks and other common events that happen to
163 * a kobject.
164 *
165 * @list: the list of all kobjects for this kset
166 * @list_lock: a lock for iterating over the kobjects
167 * @kobj: the embedded kobject for this kset (recursion, isn't it fun...)
168 * @uevent_ops: the set of uevent operations for this kset. These are
169 * called whenever a kobject has something happen to it so that the kset
170 * can add new environment variables, or filter out the uevents if so
171 * desired.
172 */
173struct kset {
174 struct list_head list;
175 spinlock_t list_lock;
176 struct kobject kobj;
177 const struct kset_uevent_ops *uevent_ops;
178} __randomize_layout;
179
180extern void kset_init(struct kset *kset);
181extern int __must_check kset_register(struct kset *kset);
182extern void kset_unregister(struct kset *kset);
183extern struct kset * __must_check kset_create_and_add(const char *name,
184 const struct kset_uevent_ops *u,
185 struct kobject *parent_kobj);
186
187static inline struct kset *to_kset(struct kobject *kobj)
188{
189 return kobj ? container_of(kobj, struct kset, kobj) : NULL;
190}
191
192static inline struct kset *kset_get(struct kset *k)
193{
194 return k ? to_kset(kobject_get(&k->kobj)) : NULL;
195}
196
197static inline void kset_put(struct kset *k)
198{
199 kobject_put(&k->kobj);
200}
201
202static inline const struct kobj_type *get_ktype(struct kobject *kobj)
203{
204 return kobj->ktype;
205}
206
207extern struct kobject *kset_find_obj(struct kset *, const char *);
208
209/* The global /sys/kernel/ kobject for people to chain off of */
210extern struct kobject *kernel_kobj;
211/* The global /sys/kernel/mm/ kobject for people to chain off of */
212extern struct kobject *mm_kobj;
213/* The global /sys/hypervisor/ kobject for people to chain off of */
214extern struct kobject *hypervisor_kobj;
215/* The global /sys/power/ kobject for people to chain off of */
216extern struct kobject *power_kobj;
217/* The global /sys/firmware/ kobject for people to chain off of */
218extern struct kobject *firmware_kobj;
219
220int kobject_uevent(struct kobject *kobj, enum kobject_action action);
221int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
222 char *envp[]);
223int kobject_synth_uevent(struct kobject *kobj, const char *buf, size_t count);
224
225__printf(2, 3)
226int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...);
227
228#endif /* _KOBJECT_H_ */