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1/*
2 * Routines to manage notifier chains for passing status changes to any
3 * interested routines. We need this instead of hard coded call lists so
4 * that modules can poke their nose into the innards. The network devices
5 * needed them so here they are for the rest of you.
6 *
7 * Alan Cox <Alan.Cox@linux.org>
8 */
9
10#ifndef _LINUX_NOTIFIER_H
11#define _LINUX_NOTIFIER_H
12#include <linux/errno.h>
13#include <linux/mutex.h>
14#include <linux/rwsem.h>
15#include <linux/srcu.h>
16
17/*
18 * Notifier chains are of four types:
19 *
20 * Atomic notifier chains: Chain callbacks run in interrupt/atomic
21 * context. Callouts are not allowed to block.
22 * Blocking notifier chains: Chain callbacks run in process context.
23 * Callouts are allowed to block.
24 * Raw notifier chains: There are no restrictions on callbacks,
25 * registration, or unregistration. All locking and protection
26 * must be provided by the caller.
27 * SRCU notifier chains: A variant of blocking notifier chains, with
28 * the same restrictions.
29 *
30 * atomic_notifier_chain_register() may be called from an atomic context,
31 * but blocking_notifier_chain_register() and srcu_notifier_chain_register()
32 * must be called from a process context. Ditto for the corresponding
33 * _unregister() routines.
34 *
35 * atomic_notifier_chain_unregister(), blocking_notifier_chain_unregister(),
36 * and srcu_notifier_chain_unregister() _must not_ be called from within
37 * the call chain.
38 *
39 * SRCU notifier chains are an alternative form of blocking notifier chains.
40 * They use SRCU (Sleepable Read-Copy Update) instead of rw-semaphores for
41 * protection of the chain links. This means there is _very_ low overhead
42 * in srcu_notifier_call_chain(): no cache bounces and no memory barriers.
43 * As compensation, srcu_notifier_chain_unregister() is rather expensive.
44 * SRCU notifier chains should be used when the chain will be called very
45 * often but notifier_blocks will seldom be removed. Also, SRCU notifier
46 * chains are slightly more difficult to use because they require special
47 * runtime initialization.
48 */
49
50struct notifier_block {
51 int (*notifier_call)(struct notifier_block *, unsigned long, void *);
52 struct notifier_block __rcu *next;
53 int priority;
54};
55
56struct atomic_notifier_head {
57 spinlock_t lock;
58 struct notifier_block __rcu *head;
59};
60
61struct blocking_notifier_head {
62 struct rw_semaphore rwsem;
63 struct notifier_block __rcu *head;
64};
65
66struct raw_notifier_head {
67 struct notifier_block __rcu *head;
68};
69
70struct srcu_notifier_head {
71 struct mutex mutex;
72 struct srcu_struct srcu;
73 struct notifier_block __rcu *head;
74};
75
76#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
77 spin_lock_init(&(name)->lock); \
78 (name)->head = NULL; \
79 } while (0)
80#define BLOCKING_INIT_NOTIFIER_HEAD(name) do { \
81 init_rwsem(&(name)->rwsem); \
82 (name)->head = NULL; \
83 } while (0)
84#define RAW_INIT_NOTIFIER_HEAD(name) do { \
85 (name)->head = NULL; \
86 } while (0)
87
88/* srcu_notifier_heads must be initialized and cleaned up dynamically */
89extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
90#define srcu_cleanup_notifier_head(name) \
91 cleanup_srcu_struct(&(name)->srcu);
92
93#define ATOMIC_NOTIFIER_INIT(name) { \
94 .lock = __SPIN_LOCK_UNLOCKED(name.lock), \
95 .head = NULL }
96#define BLOCKING_NOTIFIER_INIT(name) { \
97 .rwsem = __RWSEM_INITIALIZER((name).rwsem), \
98 .head = NULL }
99#define RAW_NOTIFIER_INIT(name) { \
100 .head = NULL }
101/* srcu_notifier_heads cannot be initialized statically */
102
103#define ATOMIC_NOTIFIER_HEAD(name) \
104 struct atomic_notifier_head name = \
105 ATOMIC_NOTIFIER_INIT(name)
106#define BLOCKING_NOTIFIER_HEAD(name) \
107 struct blocking_notifier_head name = \
108 BLOCKING_NOTIFIER_INIT(name)
109#define RAW_NOTIFIER_HEAD(name) \
110 struct raw_notifier_head name = \
111 RAW_NOTIFIER_INIT(name)
112
113#ifdef __KERNEL__
114
115extern int atomic_notifier_chain_register(struct atomic_notifier_head *nh,
116 struct notifier_block *nb);
117extern int blocking_notifier_chain_register(struct blocking_notifier_head *nh,
118 struct notifier_block *nb);
119extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
120 struct notifier_block *nb);
121extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
122 struct notifier_block *nb);
123
124extern int blocking_notifier_chain_cond_register(
125 struct blocking_notifier_head *nh,
126 struct notifier_block *nb);
127
128extern int atomic_notifier_chain_unregister(struct atomic_notifier_head *nh,
129 struct notifier_block *nb);
130extern int blocking_notifier_chain_unregister(struct blocking_notifier_head *nh,
131 struct notifier_block *nb);
132extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
133 struct notifier_block *nb);
134extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
135 struct notifier_block *nb);
136
137extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
138 unsigned long val, void *v);
139extern int __atomic_notifier_call_chain(struct atomic_notifier_head *nh,
140 unsigned long val, void *v, int nr_to_call, int *nr_calls);
141extern int blocking_notifier_call_chain(struct blocking_notifier_head *nh,
142 unsigned long val, void *v);
143extern int __blocking_notifier_call_chain(struct blocking_notifier_head *nh,
144 unsigned long val, void *v, int nr_to_call, int *nr_calls);
145extern int raw_notifier_call_chain(struct raw_notifier_head *nh,
146 unsigned long val, void *v);
147extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
148 unsigned long val, void *v, int nr_to_call, int *nr_calls);
149extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
150 unsigned long val, void *v);
151extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
152 unsigned long val, void *v, int nr_to_call, int *nr_calls);
153
154#define NOTIFY_DONE 0x0000 /* Don't care */
155#define NOTIFY_OK 0x0001 /* Suits me */
156#define NOTIFY_STOP_MASK 0x8000 /* Don't call further */
157#define NOTIFY_BAD (NOTIFY_STOP_MASK|0x0002)
158 /* Bad/Veto action */
159/*
160 * Clean way to return from the notifier and stop further calls.
161 */
162#define NOTIFY_STOP (NOTIFY_OK|NOTIFY_STOP_MASK)
163
164/* Encapsulate (negative) errno value (in particular, NOTIFY_BAD <=> EPERM). */
165static inline int notifier_from_errno(int err)
166{
167 if (err)
168 return NOTIFY_STOP_MASK | (NOTIFY_OK - err);
169
170 return NOTIFY_OK;
171}
172
173/* Restore (negative) errno value from notify return value. */
174static inline int notifier_to_errno(int ret)
175{
176 ret &= ~NOTIFY_STOP_MASK;
177 return ret > NOTIFY_OK ? NOTIFY_OK - ret : 0;
178}
179
180/*
181 * Declared notifiers so far. I can imagine quite a few more chains
182 * over time (eg laptop power reset chains, reboot chain (to clean
183 * device units up), device [un]mount chain, module load/unload chain,
184 * low memory chain, screenblank chain (for plug in modular screenblankers)
185 * VC switch chains (for loadable kernel svgalib VC switch helpers) etc...
186 */
187
188/* CPU notfiers are defined in include/linux/cpu.h. */
189
190/* netdevice notifiers are defined in include/linux/netdevice.h */
191
192/* reboot notifiers are defined in include/linux/reboot.h. */
193
194/* Hibernation and suspend events are defined in include/linux/suspend.h. */
195
196/* Virtual Terminal events are defined in include/linux/vt.h. */
197
198#define NETLINK_URELEASE 0x0001 /* Unicast netlink socket released */
199
200/* Console keyboard events.
201 * Note: KBD_KEYCODE is always sent before KBD_UNBOUND_KEYCODE, KBD_UNICODE and
202 * KBD_KEYSYM. */
203#define KBD_KEYCODE 0x0001 /* Keyboard keycode, called before any other */
204#define KBD_UNBOUND_KEYCODE 0x0002 /* Keyboard keycode which is not bound to any other */
205#define KBD_UNICODE 0x0003 /* Keyboard unicode */
206#define KBD_KEYSYM 0x0004 /* Keyboard keysym */
207#define KBD_POST_KEYSYM 0x0005 /* Called after keyboard keysym interpretation */
208
209extern struct blocking_notifier_head reboot_notifier_list;
210
211#endif /* __KERNEL__ */
212#endif /* _LINUX_NOTIFIER_H */