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11#ifndef _LINUX_NOTIFIER_H
12#define _LINUX_NOTIFIER_H
13#include <linux/errno.h>
14#include <linux/mutex.h>
15#include <linux/rwsem.h>
16#include <linux/srcu.h>
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49struct notifier_block;
50
51typedef int (*notifier_fn_t)(struct notifier_block *nb,
52 unsigned long action, void *data);
53
54struct notifier_block {
55 notifier_fn_t notifier_call;
56 struct notifier_block __rcu *next;
57 int priority;
58};
59
60struct atomic_notifier_head {
61 spinlock_t lock;
62 struct notifier_block __rcu *head;
63};
64
65struct blocking_notifier_head {
66 struct rw_semaphore rwsem;
67 struct notifier_block __rcu *head;
68};
69
70struct raw_notifier_head {
71 struct notifier_block __rcu *head;
72};
73
74struct srcu_notifier_head {
75 struct mutex mutex;
76 struct srcu_struct srcu;
77 struct notifier_block __rcu *head;
78};
79
80#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
81 spin_lock_init(&(name)->lock); \
82 (name)->head = NULL; \
83 } while (0)
84#define BLOCKING_INIT_NOTIFIER_HEAD(name) do { \
85 init_rwsem(&(name)->rwsem); \
86 (name)->head = NULL; \
87 } while (0)
88#define RAW_INIT_NOTIFIER_HEAD(name) do { \
89 (name)->head = NULL; \
90 } while (0)
91
92
93extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
94#define srcu_cleanup_notifier_head(name) \
95 cleanup_srcu_struct(&(name)->srcu);
96
97#define ATOMIC_NOTIFIER_INIT(name) { \
98 .lock = __SPIN_LOCK_UNLOCKED(name.lock), \
99 .head = NULL }
100#define BLOCKING_NOTIFIER_INIT(name) { \
101 .rwsem = __RWSEM_INITIALIZER((name).rwsem), \
102 .head = NULL }
103#define RAW_NOTIFIER_INIT(name) { \
104 .head = NULL }
105
106#define SRCU_NOTIFIER_INIT(name, pcpu) \
107 { \
108 .mutex = __MUTEX_INITIALIZER(name.mutex), \
109 .head = NULL, \
110 .srcu = __SRCU_STRUCT_INIT(name.srcu, pcpu), \
111 }
112
113#define ATOMIC_NOTIFIER_HEAD(name) \
114 struct atomic_notifier_head name = \
115 ATOMIC_NOTIFIER_INIT(name)
116#define BLOCKING_NOTIFIER_HEAD(name) \
117 struct blocking_notifier_head name = \
118 BLOCKING_NOTIFIER_INIT(name)
119#define RAW_NOTIFIER_HEAD(name) \
120 struct raw_notifier_head name = \
121 RAW_NOTIFIER_INIT(name)
122
123#ifdef CONFIG_TREE_SRCU
124#define _SRCU_NOTIFIER_HEAD(name, mod) \
125 static DEFINE_PER_CPU(struct srcu_data, name##_head_srcu_data); \
126 mod struct srcu_notifier_head name = \
127 SRCU_NOTIFIER_INIT(name, name##_head_srcu_data)
128
129#else
130#define _SRCU_NOTIFIER_HEAD(name, mod) \
131 mod struct srcu_notifier_head name = \
132 SRCU_NOTIFIER_INIT(name, name)
133
134#endif
135
136#define SRCU_NOTIFIER_HEAD(name) \
137 _SRCU_NOTIFIER_HEAD(name, )
138
139#define SRCU_NOTIFIER_HEAD_STATIC(name) \
140 _SRCU_NOTIFIER_HEAD(name, static)
141
142#ifdef __KERNEL__
143
144extern int atomic_notifier_chain_register(struct atomic_notifier_head *nh,
145 struct notifier_block *nb);
146extern int blocking_notifier_chain_register(struct blocking_notifier_head *nh,
147 struct notifier_block *nb);
148extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
149 struct notifier_block *nb);
150extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
151 struct notifier_block *nb);
152
153extern int atomic_notifier_chain_unregister(struct atomic_notifier_head *nh,
154 struct notifier_block *nb);
155extern int blocking_notifier_chain_unregister(struct blocking_notifier_head *nh,
156 struct notifier_block *nb);
157extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
158 struct notifier_block *nb);
159extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
160 struct notifier_block *nb);
161
162extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
163 unsigned long val, void *v);
164extern int blocking_notifier_call_chain(struct blocking_notifier_head *nh,
165 unsigned long val, void *v);
166extern int raw_notifier_call_chain(struct raw_notifier_head *nh,
167 unsigned long val, void *v);
168extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
169 unsigned long val, void *v);
170
171extern int atomic_notifier_call_chain_robust(struct atomic_notifier_head *nh,
172 unsigned long val_up, unsigned long val_down, void *v);
173extern int blocking_notifier_call_chain_robust(struct blocking_notifier_head *nh,
174 unsigned long val_up, unsigned long val_down, void *v);
175extern int raw_notifier_call_chain_robust(struct raw_notifier_head *nh,
176 unsigned long val_up, unsigned long val_down, void *v);
177
178#define NOTIFY_DONE 0x0000
179#define NOTIFY_OK 0x0001
180#define NOTIFY_STOP_MASK 0x8000
181#define NOTIFY_BAD (NOTIFY_STOP_MASK|0x0002)
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185
186#define NOTIFY_STOP (NOTIFY_OK|NOTIFY_STOP_MASK)
187
188
189static inline int notifier_from_errno(int err)
190{
191 if (err)
192 return NOTIFY_STOP_MASK | (NOTIFY_OK - err);
193
194 return NOTIFY_OK;
195}
196
197
198static inline int notifier_to_errno(int ret)
199{
200 ret &= ~NOTIFY_STOP_MASK;
201 return ret > NOTIFY_OK ? NOTIFY_OK - ret : 0;
202}
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222#define NETLINK_URELEASE 0x0001
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227#define KBD_KEYCODE 0x0001
228#define KBD_UNBOUND_KEYCODE 0x0002
229#define KBD_UNICODE 0x0003
230#define KBD_KEYSYM 0x0004
231#define KBD_POST_KEYSYM 0x0005
232
233extern struct blocking_notifier_head reboot_notifier_list;
234
235#endif
236#endif
237