[linux-2.6-block.git] / include / linux / notifier.h

/*
 *	Routines to manage notifier chains for passing status changes to any
 *	interested routines. We need this instead of hard coded call lists so
 *	that modules can poke their nose into the innards. The network devices
 *	needed them so here they are for the rest of you.
 *
 *				Alan Cox <Alan.Cox@linux.org>
 */
 
#ifndef _LINUX_NOTIFIER_H
#define _LINUX_NOTIFIER_H
#include <linux/errno.h>
#include <linux/mutex.h>
#include <linux/rwsem.h>
#include <linux/srcu.h>

/*
 * Notifier chains are of four types:
 *
 *	Atomic notifier chains: Chain callbacks run in interrupt/atomic
 *		context. Callouts are not allowed to block.
 *	Blocking notifier chains: Chain callbacks run in process context.
 *		Callouts are allowed to block.
 *	Raw notifier chains: There are no restrictions on callbacks,
 *		registration, or unregistration.  All locking and protection
 *		must be provided by the caller.
 *	SRCU notifier chains: A variant of blocking notifier chains, with
 *		the same restrictions.
 *
 * atomic_notifier_chain_register() may be called from an atomic context,
 * but blocking_notifier_chain_register() and srcu_notifier_chain_register()
 * must be called from a process context.  Ditto for the corresponding
 * _unregister() routines.
 *
 * atomic_notifier_chain_unregister(), blocking_notifier_chain_unregister(),
 * and srcu_notifier_chain_unregister() _must not_ be called from within
 * the call chain.
 *
 * SRCU notifier chains are an alternative form of blocking notifier chains.
 * They use SRCU (Sleepable Read-Copy Update) instead of rw-semaphores for
 * protection of the chain links.  This means there is _very_ low overhead
 * in srcu_notifier_call_chain(): no cache bounces and no memory barriers.
 * As compensation, srcu_notifier_chain_unregister() is rather expensive.
 * SRCU notifier chains should be used when the chain will be called very
 * often but notifier_blocks will seldom be removed.  Also, SRCU notifier
 * chains are slightly more difficult to use because they require special
 * runtime initialization.
 */

struct notifier_block {
	int (*notifier_call)(struct notifier_block *, unsigned long, void *);
	struct notifier_block *next;
	int priority;
};

struct atomic_notifier_head {
	spinlock_t lock;
	struct notifier_block *head;
};

struct blocking_notifier_head {
	struct rw_semaphore rwsem;
	struct notifier_block *head;
};

struct raw_notifier_head {
	struct notifier_block *head;
};

struct srcu_notifier_head {
	struct mutex mutex;
	struct srcu_struct srcu;
	struct notifier_block *head;
};

#define ATOMIC_INIT_NOTIFIER_HEAD(name) do {	\
		spin_lock_init(&(name)->lock);	\
		(name)->head = NULL;		\
	} while (0)
#define BLOCKING_INIT_NOTIFIER_HEAD(name) do {	\
		init_rwsem(&(name)->rwsem);	\
		(name)->head = NULL;		\
	} while (0)
#define RAW_INIT_NOTIFIER_HEAD(name) do {	\
		(name)->head = NULL;		\
	} while (0)

/* srcu_notifier_heads must be initialized and cleaned up dynamically */
extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
#define srcu_cleanup_notifier_head(name)	\
		cleanup_srcu_struct(&(name)->srcu);

#define ATOMIC_NOTIFIER_INIT(name) {				\
		.lock = __SPIN_LOCK_UNLOCKED(name.lock),	\
		.head = NULL }
#define BLOCKING_NOTIFIER_INIT(name) {				\
		.rwsem = __RWSEM_INITIALIZER((name).rwsem),	\
		.head = NULL }
#define RAW_NOTIFIER_INIT(name)	{				\
		.head = NULL }
/* srcu_notifier_heads cannot be initialized statically */

#define ATOMIC_NOTIFIER_HEAD(name)				\
	struct atomic_notifier_head name =			\
		ATOMIC_NOTIFIER_INIT(name)
#define BLOCKING_NOTIFIER_HEAD(name)				\
	struct blocking_notifier_head name =			\
		BLOCKING_NOTIFIER_INIT(name)
#define RAW_NOTIFIER_HEAD(name)					\
	struct raw_notifier_head name =				\
		RAW_NOTIFIER_INIT(name)

#ifdef __KERNEL__

extern int atomic_notifier_chain_register(struct atomic_notifier_head *nh,
		struct notifier_block *nb);
extern int blocking_notifier_chain_register(struct blocking_notifier_head *nh,
		struct notifier_block *nb);
extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
		struct notifier_block *nb);
extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
		struct notifier_block *nb);

extern int blocking_notifier_chain_cond_register(
		struct blocking_notifier_head *nh,
		struct notifier_block *nb);

extern int atomic_notifier_chain_unregister(struct atomic_notifier_head *nh,
		struct notifier_block *nb);
extern int blocking_notifier_chain_unregister(struct blocking_notifier_head *nh,
		struct notifier_block *nb);
extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
		struct notifier_block *nb);
extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
		struct notifier_block *nb);

extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
		unsigned long val, void *v);
extern int __atomic_notifier_call_chain(struct atomic_notifier_head *nh,
	unsigned long val, void *v, int nr_to_call, int *nr_calls);
extern int blocking_notifier_call_chain(struct blocking_notifier_head *nh,
		unsigned long val, void *v);
extern int __blocking_notifier_call_chain(struct blocking_notifier_head *nh,
	unsigned long val, void *v, int nr_to_call, int *nr_calls);
extern int raw_notifier_call_chain(struct raw_notifier_head *nh,
		unsigned long val, void *v);
extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
	unsigned long val, void *v, int nr_to_call, int *nr_calls);
extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
		unsigned long val, void *v);
extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
	unsigned long val, void *v, int nr_to_call, int *nr_calls);

#define NOTIFY_DONE		0x0000		/* Don't care */
#define NOTIFY_OK		0x0001		/* Suits me */
#define NOTIFY_STOP_MASK	0x8000		/* Don't call further */
#define NOTIFY_BAD		(NOTIFY_STOP_MASK|0x0002)
						/* Bad/Veto action */
/*
 * Clean way to return from the notifier and stop further calls.
 */
#define NOTIFY_STOP		(NOTIFY_OK|NOTIFY_STOP_MASK)

/* Encapsulate (negative) errno value (in particular, NOTIFY_BAD <=> EPERM). */
static inline int notifier_from_errno(int err)
{
	return NOTIFY_STOP_MASK | (NOTIFY_OK - err);
}

/* Restore (negative) errno value from notify return value. */
static inline int notifier_to_errno(int ret)
{
	ret &= ~NOTIFY_STOP_MASK;
	return ret > NOTIFY_OK ? NOTIFY_OK - ret : 0;
}

/*
 *	Declared notifiers so far. I can imagine quite a few more chains
 *	over time (eg laptop power reset chains, reboot chain (to clean 
 *	device units up), device [un]mount chain, module load/unload chain,
 *	low memory chain, screenblank chain (for plug in modular screenblankers) 
 *	VC switch chains (for loadable kernel svgalib VC switch helpers) etc...
 */
 
/* netdevice notifier chain */
#define NETDEV_UP	0x0001	/* For now you can't veto a device up/down */
#define NETDEV_DOWN	0x0002
#define NETDEV_REBOOT	0x0003	/* Tell a protocol stack a network interface
				   detected a hardware crash and restarted
				   - we can use this eg to kick tcp sessions
				   once done */
#define NETDEV_CHANGE	0x0004	/* Notify device state change */
#define NETDEV_REGISTER 0x0005
#define NETDEV_UNREGISTER	0x0006
#define NETDEV_CHANGEMTU	0x0007
#define NETDEV_CHANGEADDR	0x0008
#define NETDEV_GOING_DOWN	0x0009
#define NETDEV_CHANGENAME	0x000A
#define NETDEV_FEAT_CHANGE	0x000B
#define NETDEV_BONDING_FAILOVER 0x000C
#define NETDEV_PRE_UP		0x000D
#define NETDEV_BONDING_OLDTYPE  0x000E
#define NETDEV_BONDING_NEWTYPE  0x000F
#define NETDEV_POST_INIT	0x0010
#define NETDEV_UNREGISTER_BATCH 0x0011

#define SYS_DOWN	0x0001	/* Notify of system down */
#define SYS_RESTART	SYS_DOWN
#define SYS_HALT	0x0002	/* Notify of system halt */
#define SYS_POWER_OFF	0x0003	/* Notify of system power off */

#define NETLINK_URELEASE	0x0001	/* Unicast netlink socket released */

#define CPU_ONLINE		0x0002 /* CPU (unsigned)v is up */
#define CPU_UP_PREPARE		0x0003 /* CPU (unsigned)v coming up */
#define CPU_UP_CANCELED		0x0004 /* CPU (unsigned)v NOT coming up */
#define CPU_DOWN_PREPARE	0x0005 /* CPU (unsigned)v going down */
#define CPU_DOWN_FAILED		0x0006 /* CPU (unsigned)v NOT going down */
#define CPU_DEAD		0x0007 /* CPU (unsigned)v dead */
#define CPU_DYING		0x0008 /* CPU (unsigned)v not running any task,
					* not handling interrupts, soon dead.
					* Called on the dying cpu, interrupts
					* are already disabled. Must not
					* sleep, must not fail */
#define CPU_POST_DEAD		0x0009 /* CPU (unsigned)v dead, cpu_hotplug
					* lock is dropped */
#define CPU_STARTING		0x000A /* CPU (unsigned)v soon running.
					* Called on the new cpu, just before
					* enabling interrupts. Must not sleep,
					* must not fail */

/* Used for CPU hotplug events occuring while tasks are frozen due to a suspend
 * operation in progress
 */
#define CPU_TASKS_FROZEN	0x0010

#define CPU_ONLINE_FROZEN	(CPU_ONLINE | CPU_TASKS_FROZEN)
#define CPU_UP_PREPARE_FROZEN	(CPU_UP_PREPARE | CPU_TASKS_FROZEN)
#define CPU_UP_CANCELED_FROZEN	(CPU_UP_CANCELED | CPU_TASKS_FROZEN)
#define CPU_DOWN_PREPARE_FROZEN	(CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
#define CPU_DOWN_FAILED_FROZEN	(CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
#define CPU_DEAD_FROZEN		(CPU_DEAD | CPU_TASKS_FROZEN)
#define CPU_DYING_FROZEN	(CPU_DYING | CPU_TASKS_FROZEN)
#define CPU_STARTING_FROZEN	(CPU_STARTING | CPU_TASKS_FROZEN)

/* Hibernation and suspend events */
#define PM_HIBERNATION_PREPARE	0x0001 /* Going to hibernate */
#define PM_POST_HIBERNATION	0x0002 /* Hibernation finished */
#define PM_SUSPEND_PREPARE	0x0003 /* Going to suspend the system */
#define PM_POST_SUSPEND		0x0004 /* Suspend finished */
#define PM_RESTORE_PREPARE	0x0005 /* Going to restore a saved image */
#define PM_POST_RESTORE		0x0006 /* Restore failed */

/* Console keyboard events.
 * Note: KBD_KEYCODE is always sent before KBD_UNBOUND_KEYCODE, KBD_UNICODE and
 * KBD_KEYSYM. */
#define KBD_KEYCODE		0x0001 /* Keyboard keycode, called before any other */
#define KBD_UNBOUND_KEYCODE	0x0002 /* Keyboard keycode which is not bound to any other */
#define KBD_UNICODE		0x0003 /* Keyboard unicode */
#define KBD_KEYSYM		0x0004 /* Keyboard keysym */
#define KBD_POST_KEYSYM		0x0005 /* Called after keyboard keysym interpretation */

extern struct blocking_notifier_head reboot_notifier_list;

/* Virtual Terminal events. */
#define VT_ALLOCATE		0x0001 /* Console got allocated */
#define VT_DEALLOCATE		0x0002 /* Console will be deallocated */
#define VT_WRITE		0x0003 /* A char got output */
#define VT_UPDATE		0x0004 /* A bigger update occurred */
#define VT_PREWRITE		0x0005 /* A char is about to be written to the console */

#endif /* __KERNEL__ */
#endif /* _LINUX_NOTIFIER_H */
Commit	Line	Data
1da177e4 LT	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>
e041c683 AS	13	#include <linux/mutex.h>
e041c683 AS	14	#include <linux/rwsem.h>
eabc0694	15	#include <linux/srcu.h>
1da177e4	16
e041c683	17	/*
eabc0694	18	* Notifier chains are of four types:
e041c683 AS	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.
eabc0694 AS	27	* SRCU notifier chains: A variant of blocking notifier chains, with
eabc0694 AS	28	* the same restrictions.
e041c683 AS	29	*
e041c683 AS	30	* atomic_notifier_chain_register() may be called from an atomic context,
eabc0694 AS	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.
e041c683	34	*
eabc0694 AS	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.
e041c683 AS	48	*/
	49
	50	struct notifier_block {
	51	int (notifier_call)(struct notifier_block , unsigned long, void *);
1da177e4 LT	52	struct notifier_block *next;
	53	int priority;
	54	};
	55
e041c683 AS	56	struct atomic_notifier_head {
	57	spinlock_t lock;
	58	struct notifier_block *head;
	59	};
	60
	61	struct blocking_notifier_head {
	62	struct rw_semaphore rwsem;
	63	struct notifier_block *head;
	64	};
	65
	66	struct raw_notifier_head {
	67	struct notifier_block *head;
	68	};
	69
eabc0694 AS	70	struct srcu_notifier_head {
	71	struct mutex mutex;
	72	struct srcu_struct srcu;
	73	struct notifier_block *head;
	74	};
	75
e041c683 AS	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
eabc0694 AS	88	/* srcu_notifier_heads must be initialized and cleaned up dynamically */
	89	extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
	90	#define srcu_cleanup_notifier_head(name) \
	91	cleanup_srcu_struct(&(name)->srcu);
	92
e041c683	93	#define ATOMIC_NOTIFIER_INIT(name) { \
e4d91918	94	.lock = __SPIN_LOCK_UNLOCKED(name.lock), \
e041c683 AS	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 }
eabc0694	101	/* srcu_notifier_heads cannot be initialized statically */
e041c683 AS	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)
1da177e4 LT	112
	113	#ifdef __KERNEL__
	114
6f7cc11a GS	115	extern int atomic_notifier_chain_register(struct atomic_notifier_head *nh,
	116	struct notifier_block *nb);
	117	extern int blocking_notifier_chain_register(struct blocking_notifier_head *nh,
	118	struct notifier_block *nb);
	119	extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
	120	struct notifier_block *nb);
	121	extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
	122	struct notifier_block *nb);
	123
6546bc42 ND	124	extern int blocking_notifier_chain_cond_register(
	125	struct blocking_notifier_head *nh,
	126	struct notifier_block *nb);
	127
6f7cc11a GS	128	extern int atomic_notifier_chain_unregister(struct atomic_notifier_head *nh,
	129	struct notifier_block *nb);
	130	extern int blocking_notifier_chain_unregister(struct blocking_notifier_head *nh,
	131	struct notifier_block *nb);
	132	extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
	133	struct notifier_block *nb);
	134	extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
	135	struct notifier_block *nb);
	136
	137	extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
e041c683	138	unsigned long val, void *v);
6f7cc11a GS	139	extern int __atomic_notifier_call_chain(struct atomic_notifier_head *nh,
	140	unsigned long val, void v, int nr_to_call, int nr_calls);
	141	extern int blocking_notifier_call_chain(struct blocking_notifier_head *nh,
e041c683	142	unsigned long val, void *v);
6f7cc11a GS	143	extern int __blocking_notifier_call_chain(struct blocking_notifier_head *nh,
	144	unsigned long val, void v, int nr_to_call, int nr_calls);
	145	extern int raw_notifier_call_chain(struct raw_notifier_head *nh,
e041c683	146	unsigned long val, void *v);
6f7cc11a GS	147	extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
	148	unsigned long val, void v, int nr_to_call, int nr_calls);
	149	extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
eabc0694	150	unsigned long val, void *v);
6f7cc11a GS	151	extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
6f7cc11a GS	152	unsigned long val, void v, int nr_to_call, int nr_calls);
1da177e4 LT	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 */
e041c683 AS	157	#define NOTIFY_BAD (NOTIFY_STOP_MASK\|0x0002)
e041c683 AS	158	/* Bad/Veto action */
1da177e4 LT	159	/*
	160	* Clean way to return from the notifier and stop further calls.
	161	*/
	162	#define NOTIFY_STOP (NOTIFY_OK\|NOTIFY_STOP_MASK)
	163
fcc5a03a HX	164	/* Encapsulate (negative) errno value (in particular, NOTIFY_BAD <=> EPERM). */
	165	static inline int notifier_from_errno(int err)
	166	{
	167	return NOTIFY_STOP_MASK \| (NOTIFY_OK - err);
	168	}
	169
	170	/* Restore (negative) errno value from notify return value. */
	171	static inline int notifier_to_errno(int ret)
	172	{
	173	ret &= ~NOTIFY_STOP_MASK;
	174	return ret > NOTIFY_OK ? NOTIFY_OK - ret : 0;
	175	}
	176
1da177e4 LT	177	/*
	178	* Declared notifiers so far. I can imagine quite a few more chains
	179	* over time (eg laptop power reset chains, reboot chain (to clean
	180	* device units up), device [un]mount chain, module load/unload chain,
	181	* low memory chain, screenblank chain (for plug in modular screenblankers)
	182	* VC switch chains (for loadable kernel svgalib VC switch helpers) etc...
	183	*/
	184
	185	/* netdevice notifier chain */
	186	#define NETDEV_UP 0x0001 /* For now you can't veto a device up/down */
	187	#define NETDEV_DOWN 0x0002
	188	#define NETDEV_REBOOT 0x0003 /* Tell a protocol stack a network interface
	189	detected a hardware crash and restarted
	190	- we can use this eg to kick tcp sessions
	191	once done */
	192	#define NETDEV_CHANGE 0x0004 /* Notify device state change */
	193	#define NETDEV_REGISTER 0x0005
	194	#define NETDEV_UNREGISTER 0x0006
	195	#define NETDEV_CHANGEMTU 0x0007
	196	#define NETDEV_CHANGEADDR 0x0008
	197	#define NETDEV_GOING_DOWN 0x0009
	198	#define NETDEV_CHANGENAME 0x000A
d8a33ac4	199	#define NETDEV_FEAT_CHANGE 0x000B
c1da4ac7	200	#define NETDEV_BONDING_FAILOVER 0x000C
3b8bcfd5	201	#define NETDEV_PRE_UP 0x000D
75c78500 MS	202	#define NETDEV_BONDING_OLDTYPE 0x000E
75c78500 MS	203	#define NETDEV_BONDING_NEWTYPE 0x000F
7ffbe3fd	204	#define NETDEV_POST_INIT 0x0010
a5ee1551	205	#define NETDEV_UNREGISTER_BATCH 0x0011
1da177e4 LT	206
	207	#define SYS_DOWN 0x0001 /* Notify of system down */
	208	#define SYS_RESTART SYS_DOWN
	209	#define SYS_HALT 0x0002 /* Notify of system halt */
	210	#define SYS_POWER_OFF 0x0003 /* Notify of system power off */
	211
	212	#define NETLINK_URELEASE 0x0001 /* Unicast netlink socket released */
	213
	214	#define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */
	215	#define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */
	216	#define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */
	217	#define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */
	218	#define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */
	219	#define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */
95402b38	220	#define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task,
e545a614 MS	221	* not handling interrupts, soon dead.
	222	* Called on the dying cpu, interrupts
	223	* are already disabled. Must not
	224	* sleep, must not fail */
3da1c84c ON	225	#define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug
3da1c84c ON	226	* lock is dropped */
e545a614 MS	227	#define CPU_STARTING 0x000A /* CPU (unsigned)v soon running.
	228	* Called on the new cpu, just before
	229	* enabling interrupts. Must not sleep,
	230	* must not fail */
1da177e4	231
8bb78442 RW	232	/* Used for CPU hotplug events occuring while tasks are frozen due to a suspend
	233	* operation in progress
	234	*/
	235	#define CPU_TASKS_FROZEN 0x0010
	236
	237	#define CPU_ONLINE_FROZEN (CPU_ONLINE \| CPU_TASKS_FROZEN)
	238	#define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE \| CPU_TASKS_FROZEN)
	239	#define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED \| CPU_TASKS_FROZEN)
	240	#define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE \| CPU_TASKS_FROZEN)
	241	#define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED \| CPU_TASKS_FROZEN)
	242	#define CPU_DEAD_FROZEN (CPU_DEAD \| CPU_TASKS_FROZEN)
db912f96	243	#define CPU_DYING_FROZEN (CPU_DYING \| CPU_TASKS_FROZEN)
e545a614	244	#define CPU_STARTING_FROZEN (CPU_STARTING \| CPU_TASKS_FROZEN)
8bb78442	245
b10d9117 RW	246	/* Hibernation and suspend events */
	247	#define PM_HIBERNATION_PREPARE 0x0001 /* Going to hibernate */
	248	#define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */
	249	#define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */
	250	#define PM_POST_SUSPEND 0x0004 /* Suspend finished */
c3e94d89 AS	251	#define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */
c3e94d89 AS	252	#define PM_POST_RESTORE 0x0006 /* Restore failed */
b10d9117	253
41ab4396 ST	254	/* Console keyboard events.
	255	* Note: KBD_KEYCODE is always sent before KBD_UNBOUND_KEYCODE, KBD_UNICODE and
	256	* KBD_KEYSYM. */
	257	#define KBD_KEYCODE 0x0001 /* Keyboard keycode, called before any other */
	258	#define KBD_UNBOUND_KEYCODE 0x0002 /* Keyboard keycode which is not bound to any other */
	259	#define KBD_UNICODE 0x0003 /* Keyboard unicode */
	260	#define KBD_KEYSYM 0x0004 /* Keyboard keysym */
	261	#define KBD_POST_KEYSYM 0x0005 /* Called after keyboard keysym interpretation */
	262
fe9d4f57 AD	263	extern struct blocking_notifier_head reboot_notifier_list;
fe9d4f57 AD	264
b293d758 ST	265	/* Virtual Terminal events. */
	266	#define VT_ALLOCATE 0x0001 /* Console got allocated */
	267	#define VT_DEALLOCATE 0x0002 /* Console will be deallocated */
	268	#define VT_WRITE 0x0003 /* A char got output */
	269	#define VT_UPDATE 0x0004 /* A bigger update occurred */
0341a4d0	270	#define VT_PREWRITE 0x0005 /* A char is about to be written to the console */
b293d758	271
1da177e4 LT	272	#endif /* __KERNEL__ */
1da177e4 LT	273	#endif /* _LINUX_NOTIFIER_H */