[deliverable/linux.git] / include / linux / interrupt.h

/* interrupt.h */
#ifndef _LINUX_INTERRUPT_H
#define _LINUX_INTERRUPT_H

#include <linux/kernel.h>
#include <linux/linkage.h>
#include <linux/bitops.h>
#include <linux/preempt.h>
#include <linux/cpumask.h>
#include <linux/irqreturn.h>
#include <linux/hardirq.h>
#include <linux/sched.h>
#include <linux/irqflags.h>
#include <linux/bottom_half.h>
#include <linux/device.h>
#include <asm/atomic.h>
#include <asm/ptrace.h>
#include <asm/system.h>

/*
 * These correspond to the IORESOURCE_IRQ_* defines in
 * linux/ioport.h to select the interrupt line behaviour.  When
 * requesting an interrupt without specifying a IRQF_TRIGGER, the
 * setting should be assumed to be "as already configured", which
 * may be as per machine or firmware initialisation.
 */
#define IRQF_TRIGGER_NONE	0x00000000
#define IRQF_TRIGGER_RISING	0x00000001
#define IRQF_TRIGGER_FALLING	0x00000002
#define IRQF_TRIGGER_HIGH	0x00000004
#define IRQF_TRIGGER_LOW	0x00000008
#define IRQF_TRIGGER_MASK	(IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \
				 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
#define IRQF_TRIGGER_PROBE	0x00000010

/*
 * These flags used only by the kernel as part of the
 * irq handling routines.
 *
 * IRQF_DISABLED - keep irqs disabled when calling the action handler
 * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
 * IRQF_SHARED - allow sharing the irq among several devices
 * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
 * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
 * IRQF_PERCPU - Interrupt is per cpu
 * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
 */
#define IRQF_DISABLED		0x00000020
#define IRQF_SAMPLE_RANDOM	0x00000040
#define IRQF_SHARED		0x00000080
#define IRQF_PROBE_SHARED	0x00000100
#define IRQF_TIMER		0x00000200
#define IRQF_PERCPU		0x00000400
#define IRQF_NOBALANCING	0x00000800

/*
 * Migration helpers. Scheduled for removal in 1/2007
 * Do not use for new code !
 */
#define SA_INTERRUPT		IRQF_DISABLED
#define SA_SAMPLE_RANDOM	IRQF_SAMPLE_RANDOM
#define SA_SHIRQ		IRQF_SHARED
#define SA_PROBEIRQ		IRQF_PROBE_SHARED
#define SA_PERCPU		IRQF_PERCPU

#define SA_TRIGGER_LOW		IRQF_TRIGGER_LOW
#define SA_TRIGGER_HIGH		IRQF_TRIGGER_HIGH
#define SA_TRIGGER_FALLING	IRQF_TRIGGER_FALLING
#define SA_TRIGGER_RISING	IRQF_TRIGGER_RISING
#define SA_TRIGGER_MASK		IRQF_TRIGGER_MASK

typedef irqreturn_t (*irq_handler_t)(int, void *);

struct irqaction {
	irq_handler_t handler;
	unsigned long flags;
	cpumask_t mask;
	const char *name;
	void *dev_id;
	struct irqaction *next;
	int irq;
	struct proc_dir_entry *dir;
};

extern irqreturn_t no_action(int cpl, void *dev_id);
extern int request_irq(unsigned int, irq_handler_t handler,
		       unsigned long, const char *, void *);
extern void free_irq(unsigned int, void *);

extern int devm_request_irq(struct device *dev, unsigned int irq,
			    irq_handler_t handler, unsigned long irqflags,
			    const char *devname, void *dev_id);
extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);

/*
 * On lockdep we dont want to enable hardirqs in hardirq
 * context. Use local_irq_enable_in_hardirq() to annotate
 * kernel code that has to do this nevertheless (pretty much
 * the only valid case is for old/broken hardware that is
 * insanely slow).
 *
 * NOTE: in theory this might break fragile code that relies
 * on hardirq delivery - in practice we dont seem to have such
 * places left. So the only effect should be slightly increased
 * irqs-off latencies.
 */
#ifdef CONFIG_LOCKDEP
# define local_irq_enable_in_hardirq()	do { } while (0)
#else
# define local_irq_enable_in_hardirq()	local_irq_enable()
#endif

#ifdef CONFIG_GENERIC_HARDIRQS
extern void disable_irq_nosync(unsigned int irq);
extern void disable_irq(unsigned int irq);
extern void enable_irq(unsigned int irq);

/*
 * Special lockdep variants of irq disabling/enabling.
 * These should be used for locking constructs that
 * know that a particular irq context which is disabled,
 * and which is the only irq-context user of a lock,
 * that it's safe to take the lock in the irq-disabled
 * section without disabling hardirqs.
 *
 * On !CONFIG_LOCKDEP they are equivalent to the normal
 * irq disable/enable methods.
 */
static inline void disable_irq_nosync_lockdep(unsigned int irq)
{
	disable_irq_nosync(irq);
#ifdef CONFIG_LOCKDEP
	local_irq_disable();
#endif
}

static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
{
	disable_irq_nosync(irq);
#ifdef CONFIG_LOCKDEP
	local_irq_save(*flags);
#endif
}

static inline void disable_irq_lockdep(unsigned int irq)
{
	disable_irq(irq);
#ifdef CONFIG_LOCKDEP
	local_irq_disable();
#endif
}

static inline void enable_irq_lockdep(unsigned int irq)
{
#ifdef CONFIG_LOCKDEP
	local_irq_enable();
#endif
	enable_irq(irq);
}

static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
{
#ifdef CONFIG_LOCKDEP
	local_irq_restore(*flags);
#endif
	enable_irq(irq);
}

/* IRQ wakeup (PM) control: */
extern int set_irq_wake(unsigned int irq, unsigned int on);

static inline int enable_irq_wake(unsigned int irq)
{
	return set_irq_wake(irq, 1);
}

static inline int disable_irq_wake(unsigned int irq)
{
	return set_irq_wake(irq, 0);
}

#else /* !CONFIG_GENERIC_HARDIRQS */
/*
 * NOTE: non-genirq architectures, if they want to support the lock
 * validator need to define the methods below in their asm/irq.h
 * files, under an #ifdef CONFIG_LOCKDEP section.
 */
# ifndef CONFIG_LOCKDEP
#  define disable_irq_nosync_lockdep(irq)	disable_irq_nosync(irq)
#  define disable_irq_lockdep(irq)		disable_irq(irq)
#  define enable_irq_lockdep(irq)		enable_irq(irq)
# endif

#endif /* CONFIG_GENERIC_HARDIRQS */

#ifndef __ARCH_SET_SOFTIRQ_PENDING
#define set_softirq_pending(x) (local_softirq_pending() = (x))
#define or_softirq_pending(x)  (local_softirq_pending() |= (x))
#endif

/*
 * Temporary defines for UP kernels, until all code gets fixed.
 */
#ifndef CONFIG_SMP
static inline void __deprecated cli(void)
{
	local_irq_disable();
}
static inline void __deprecated sti(void)
{
	local_irq_enable();
}
static inline void __deprecated save_flags(unsigned long *x)
{
	local_save_flags(*x);
}
#define save_flags(x) save_flags(&x)
static inline void __deprecated restore_flags(unsigned long x)
{
	local_irq_restore(x);
}

static inline void __deprecated save_and_cli(unsigned long *x)
{
	local_irq_save(*x);
}
#define save_and_cli(x)	save_and_cli(&x)
#endif /* CONFIG_SMP */

/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
   frequency threaded job scheduling. For almost all the purposes
   tasklets are more than enough. F.e. all serial device BHs et
   al. should be converted to tasklets, not to softirqs.
 */

enum
{
	HI_SOFTIRQ=0,
	TIMER_SOFTIRQ,
	NET_TX_SOFTIRQ,
	NET_RX_SOFTIRQ,
	BLOCK_SOFTIRQ,
	TASKLET_SOFTIRQ,
	SCHED_SOFTIRQ,
};

/* softirq mask and active fields moved to irq_cpustat_t in
 * asm/hardirq.h to get better cache usage.  KAO
 */

struct softirq_action
{
	void	(*action)(struct softirq_action *);
	void	*data;
};

asmlinkage void do_softirq(void);
extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data);
extern void softirq_init(void);
#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
extern void FASTCALL(raise_softirq_irqoff(unsigned int nr));
extern void FASTCALL(raise_softirq(unsigned int nr));


/* Tasklets --- multithreaded analogue of BHs.

   Main feature differing them of generic softirqs: tasklet
   is running only on one CPU simultaneously.

   Main feature differing them of BHs: different tasklets
   may be run simultaneously on different CPUs.

   Properties:
   * If tasklet_schedule() is called, then tasklet is guaranteed
     to be executed on some cpu at least once after this.
   * If the tasklet is already scheduled, but its excecution is still not
     started, it will be executed only once.
   * If this tasklet is already running on another CPU (or schedule is called
     from tasklet itself), it is rescheduled for later.
   * Tasklet is strictly serialized wrt itself, but not
     wrt another tasklets. If client needs some intertask synchronization,
     he makes it with spinlocks.
 */

struct tasklet_struct
{
	struct tasklet_struct *next;
	unsigned long state;
	atomic_t count;
	void (*func)(unsigned long);
	unsigned long data;
};

#define DECLARE_TASKLET(name, func, data) \
struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }

#define DECLARE_TASKLET_DISABLED(name, func, data) \
struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }


enum
{
	TASKLET_STATE_SCHED,	/* Tasklet is scheduled for execution */
	TASKLET_STATE_RUN	/* Tasklet is running (SMP only) */
};

#ifdef CONFIG_SMP
static inline int tasklet_trylock(struct tasklet_struct *t)
{
	return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
}

static inline void tasklet_unlock(struct tasklet_struct *t)
{
	smp_mb__before_clear_bit(); 
	clear_bit(TASKLET_STATE_RUN, &(t)->state);
}

static inline void tasklet_unlock_wait(struct tasklet_struct *t)
{
	while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
}
#else
#define tasklet_trylock(t) 1
#define tasklet_unlock_wait(t) do { } while (0)
#define tasklet_unlock(t) do { } while (0)
#endif

extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t));

static inline void tasklet_schedule(struct tasklet_struct *t)
{
	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
		__tasklet_schedule(t);
}

extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t));

static inline void tasklet_hi_schedule(struct tasklet_struct *t)
{
	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
		__tasklet_hi_schedule(t);
}


static inline void tasklet_disable_nosync(struct tasklet_struct *t)
{
	atomic_inc(&t->count);
	smp_mb__after_atomic_inc();
}

static inline void tasklet_disable(struct tasklet_struct *t)
{
	tasklet_disable_nosync(t);
	tasklet_unlock_wait(t);
	smp_mb();
}

static inline void tasklet_enable(struct tasklet_struct *t)
{
	smp_mb__before_atomic_dec();
	atomic_dec(&t->count);
}

static inline void tasklet_hi_enable(struct tasklet_struct *t)
{
	smp_mb__before_atomic_dec();
	atomic_dec(&t->count);
}

extern void tasklet_kill(struct tasklet_struct *t);
extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
extern void tasklet_init(struct tasklet_struct *t,
			 void (*func)(unsigned long), unsigned long data);

/*
 * Autoprobing for irqs:
 *
 * probe_irq_on() and probe_irq_off() provide robust primitives
 * for accurate IRQ probing during kernel initialization.  They are
 * reasonably simple to use, are not "fooled" by spurious interrupts,
 * and, unlike other attempts at IRQ probing, they do not get hung on
 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
 *
 * For reasonably foolproof probing, use them as follows:
 *
 * 1. clear and/or mask the device's internal interrupt.
 * 2. sti();
 * 3. irqs = probe_irq_on();      // "take over" all unassigned idle IRQs
 * 4. enable the device and cause it to trigger an interrupt.
 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
 * 6. irq = probe_irq_off(irqs);  // get IRQ number, 0=none, negative=multiple
 * 7. service the device to clear its pending interrupt.
 * 8. loop again if paranoia is required.
 *
 * probe_irq_on() returns a mask of allocated irq's.
 *
 * probe_irq_off() takes the mask as a parameter,
 * and returns the irq number which occurred,
 * or zero if none occurred, or a negative irq number
 * if more than one irq occurred.
 */

#if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE) 
static inline unsigned long probe_irq_on(void)
{
	return 0;
}
static inline int probe_irq_off(unsigned long val)
{
	return 0;
}
static inline unsigned int probe_irq_mask(unsigned long val)
{
	return 0;
}
#else
extern unsigned long probe_irq_on(void);	/* returns 0 on failure */
extern int probe_irq_off(unsigned long);	/* returns 0 or negative on failure */
extern unsigned int probe_irq_mask(unsigned long);	/* returns mask of ISA interrupts */
#endif

#endif
Commit	Line	Data
1da177e4 LT	1	/* interrupt.h */
	2	#ifndef _LINUX_INTERRUPT_H
	3	#define _LINUX_INTERRUPT_H
	4
1da177e4 LT	5	#include <linux/kernel.h>
	6	#include <linux/linkage.h>
	7	#include <linux/bitops.h>
	8	#include <linux/preempt.h>
	9	#include <linux/cpumask.h>
908dcecd	10	#include <linux/irqreturn.h>
1da177e4	11	#include <linux/hardirq.h>
f037360f	12	#include <linux/sched.h>
de30a2b3	13	#include <linux/irqflags.h>
676dcb8b	14	#include <linux/bottom_half.h>
9ac7849e	15	#include <linux/device.h>
1da177e4 LT	16	#include <asm/atomic.h>
	17	#include <asm/ptrace.h>
	18	#include <asm/system.h>
	19
6e213616 TG	20	/*
	21	* These correspond to the IORESOURCE_IRQ_* defines in
	22	* linux/ioport.h to select the interrupt line behaviour. When
	23	* requesting an interrupt without specifying a IRQF_TRIGGER, the
	24	* setting should be assumed to be "as already configured", which
	25	* may be as per machine or firmware initialisation.
	26	*/
	27	#define IRQF_TRIGGER_NONE 0x00000000
	28	#define IRQF_TRIGGER_RISING 0x00000001
	29	#define IRQF_TRIGGER_FALLING 0x00000002
	30	#define IRQF_TRIGGER_HIGH 0x00000004
	31	#define IRQF_TRIGGER_LOW 0x00000008
	32	#define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH \| IRQF_TRIGGER_LOW \| \
	33	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING)
	34	#define IRQF_TRIGGER_PROBE 0x00000010
	35
	36	/*
	37	* These flags used only by the kernel as part of the
	38	* irq handling routines.
	39	*
	40	* IRQF_DISABLED - keep irqs disabled when calling the action handler
	41	* IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
	42	* IRQF_SHARED - allow sharing the irq among several devices
	43	* IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
	44	* IRQF_TIMER - Flag to mark this interrupt as timer interrupt
950f4427 TG	45	* IRQF_PERCPU - Interrupt is per cpu
950f4427 TG	46	* IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
6e213616 TG	47	*/
	48	#define IRQF_DISABLED 0x00000020
	49	#define IRQF_SAMPLE_RANDOM 0x00000040
	50	#define IRQF_SHARED 0x00000080
	51	#define IRQF_PROBE_SHARED 0x00000100
	52	#define IRQF_TIMER 0x00000200
284c6680	53	#define IRQF_PERCPU 0x00000400
950f4427	54	#define IRQF_NOBALANCING 0x00000800
6e213616 TG	55
	56	/*
	57	* Migration helpers. Scheduled for removal in 1/2007
	58	* Do not use for new code !
	59	*/
	60	#define SA_INTERRUPT IRQF_DISABLED
	61	#define SA_SAMPLE_RANDOM IRQF_SAMPLE_RANDOM
	62	#define SA_SHIRQ IRQF_SHARED
	63	#define SA_PROBEIRQ IRQF_PROBE_SHARED
284c6680	64	#define SA_PERCPU IRQF_PERCPU
6e213616 TG	65
	66	#define SA_TRIGGER_LOW IRQF_TRIGGER_LOW
	67	#define SA_TRIGGER_HIGH IRQF_TRIGGER_HIGH
	68	#define SA_TRIGGER_FALLING IRQF_TRIGGER_FALLING
	69	#define SA_TRIGGER_RISING IRQF_TRIGGER_RISING
	70	#define SA_TRIGGER_MASK IRQF_TRIGGER_MASK
	71
7d12e780	72	typedef irqreturn_t (irq_handler_t)(int, void );
da482792	73
1da177e4	74	struct irqaction {
da482792	75	irq_handler_t handler;
1da177e4 LT	76	unsigned long flags;
	77	cpumask_t mask;
	78	const char *name;
	79	void *dev_id;
	80	struct irqaction *next;
	81	int irq;
	82	struct proc_dir_entry *dir;
	83	};
	84
7d12e780	85	extern irqreturn_t no_action(int cpl, void *dev_id);
da482792	86	extern int request_irq(unsigned int, irq_handler_t handler,
1da177e4 LT	87	unsigned long, const char , void );
	88	extern void free_irq(unsigned int, void *);
	89
9ac7849e TH	90	extern int devm_request_irq(struct device *dev, unsigned int irq,
	91	irq_handler_t handler, unsigned long irqflags,
	92	const char devname, void dev_id);
	93	extern void devm_free_irq(struct device dev, unsigned int irq, void dev_id);
	94
d7e9629d IM	95	/*
	96	* On lockdep we dont want to enable hardirqs in hardirq
	97	* context. Use local_irq_enable_in_hardirq() to annotate
	98	* kernel code that has to do this nevertheless (pretty much
	99	* the only valid case is for old/broken hardware that is
	100	* insanely slow).
	101	*
	102	* NOTE: in theory this might break fragile code that relies
	103	* on hardirq delivery - in practice we dont seem to have such
	104	* places left. So the only effect should be slightly increased
	105	* irqs-off latencies.
	106	*/
	107	#ifdef CONFIG_LOCKDEP
	108	# define local_irq_enable_in_hardirq() do { } while (0)
	109	#else
	110	# define local_irq_enable_in_hardirq() local_irq_enable()
	111	#endif
1da177e4 LT	112
	113	#ifdef CONFIG_GENERIC_HARDIRQS
	114	extern void disable_irq_nosync(unsigned int irq);
	115	extern void disable_irq(unsigned int irq);
	116	extern void enable_irq(unsigned int irq);
ba9a2331	117
c01d403b IM	118	/*
	119	* Special lockdep variants of irq disabling/enabling.
	120	* These should be used for locking constructs that
	121	* know that a particular irq context which is disabled,
	122	* and which is the only irq-context user of a lock,
	123	* that it's safe to take the lock in the irq-disabled
	124	* section without disabling hardirqs.
	125	*
	126	* On !CONFIG_LOCKDEP they are equivalent to the normal
	127	* irq disable/enable methods.
	128	*/
	129	static inline void disable_irq_nosync_lockdep(unsigned int irq)
	130	{
	131	disable_irq_nosync(irq);
	132	#ifdef CONFIG_LOCKDEP
	133	local_irq_disable();
	134	#endif
	135	}
	136
e8106b94 AV	137	static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
	138	{
	139	disable_irq_nosync(irq);
	140	#ifdef CONFIG_LOCKDEP
	141	local_irq_save(*flags);
	142	#endif
	143	}
	144
c01d403b IM	145	static inline void disable_irq_lockdep(unsigned int irq)
	146	{
	147	disable_irq(irq);
	148	#ifdef CONFIG_LOCKDEP
	149	local_irq_disable();
	150	#endif
	151	}
	152
	153	static inline void enable_irq_lockdep(unsigned int irq)
	154	{
	155	#ifdef CONFIG_LOCKDEP
	156	local_irq_enable();
	157	#endif
	158	enable_irq(irq);
	159	}
	160
e8106b94 AV	161	static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
	162	{
	163	#ifdef CONFIG_LOCKDEP
	164	local_irq_restore(*flags);
	165	#endif
	166	enable_irq(irq);
	167	}
	168
ba9a2331 TG	169	/* IRQ wakeup (PM) control: */
	170	extern int set_irq_wake(unsigned int irq, unsigned int on);
	171
	172	static inline int enable_irq_wake(unsigned int irq)
	173	{
	174	return set_irq_wake(irq, 1);
	175	}
	176
	177	static inline int disable_irq_wake(unsigned int irq)
	178	{
	179	return set_irq_wake(irq, 0);
	180	}
	181
c01d403b IM	182	#else /* !CONFIG_GENERIC_HARDIRQS */
	183	/*
	184	* NOTE: non-genirq architectures, if they want to support the lock
	185	* validator need to define the methods below in their asm/irq.h
	186	* files, under an #ifdef CONFIG_LOCKDEP section.
	187	*/
	188	# ifndef CONFIG_LOCKDEP
	189	# define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
	190	# define disable_irq_lockdep(irq) disable_irq(irq)
	191	# define enable_irq_lockdep(irq) enable_irq(irq)
	192	# endif
	193
	194	#endif /* CONFIG_GENERIC_HARDIRQS */
1da177e4	195
3f74478b AK	196	#ifndef __ARCH_SET_SOFTIRQ_PENDING
	197	#define set_softirq_pending(x) (local_softirq_pending() = (x))
	198	#define or_softirq_pending(x) (local_softirq_pending() \|= (x))
	199	#endif
	200
1da177e4 LT	201	/*
	202	* Temporary defines for UP kernels, until all code gets fixed.
	203	*/
	204	#ifndef CONFIG_SMP
	205	static inline void __deprecated cli(void)
	206	{
	207	local_irq_disable();
	208	}
	209	static inline void __deprecated sti(void)
	210	{
	211	local_irq_enable();
	212	}
	213	static inline void __deprecated save_flags(unsigned long *x)
	214	{
	215	local_save_flags(*x);
	216	}
ef9ceab2	217	#define save_flags(x) save_flags(&x)
1da177e4 LT	218	static inline void __deprecated restore_flags(unsigned long x)
	219	{
	220	local_irq_restore(x);
	221	}
	222
	223	static inline void __deprecated save_and_cli(unsigned long *x)
	224	{
	225	local_irq_save(*x);
	226	}
	227	#define save_and_cli(x) save_and_cli(&x)
	228	#endif /* CONFIG_SMP */
	229
1da177e4 LT	230	/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
	231	frequency threaded job scheduling. For almost all the purposes
	232	tasklets are more than enough. F.e. all serial device BHs et
	233	al. should be converted to tasklets, not to softirqs.
	234	*/
	235
	236	enum
	237	{
	238	HI_SOFTIRQ=0,
	239	TIMER_SOFTIRQ,
	240	NET_TX_SOFTIRQ,
	241	NET_RX_SOFTIRQ,
ff856bad	242	BLOCK_SOFTIRQ,
c9819f45 CL	243	TASKLET_SOFTIRQ,
c9819f45 CL	244	SCHED_SOFTIRQ,
1da177e4 LT	245	};
	246
	247	/* softirq mask and active fields moved to irq_cpustat_t in
	248	* asm/hardirq.h to get better cache usage. KAO
	249	*/
	250
	251	struct softirq_action
	252	{
	253	void (action)(struct softirq_action );
	254	void *data;
	255	};
	256
	257	asmlinkage void do_softirq(void);
	258	extern void open_softirq(int nr, void (action)(struct softirq_action), void *data);
	259	extern void softirq_init(void);
3f74478b	260	#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
1da177e4 LT	261	extern void FASTCALL(raise_softirq_irqoff(unsigned int nr));
	262	extern void FASTCALL(raise_softirq(unsigned int nr));
	263
	264
	265	/* Tasklets --- multithreaded analogue of BHs.
	266
	267	Main feature differing them of generic softirqs: tasklet
	268	is running only on one CPU simultaneously.
	269
	270	Main feature differing them of BHs: different tasklets
	271	may be run simultaneously on different CPUs.
	272
	273	Properties:
	274	* If tasklet_schedule() is called, then tasklet is guaranteed
	275	to be executed on some cpu at least once after this.
	276	* If the tasklet is already scheduled, but its excecution is still not
	277	started, it will be executed only once.
	278	* If this tasklet is already running on another CPU (or schedule is called
	279	from tasklet itself), it is rescheduled for later.
	280	* Tasklet is strictly serialized wrt itself, but not
	281	wrt another tasklets. If client needs some intertask synchronization,
	282	he makes it with spinlocks.
	283	*/
	284
	285	struct tasklet_struct
	286	{
	287	struct tasklet_struct *next;
	288	unsigned long state;
	289	atomic_t count;
	290	void (*func)(unsigned long);
	291	unsigned long data;
	292	};
	293
	294	#define DECLARE_TASKLET(name, func, data) \
	295	struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
	296
	297	#define DECLARE_TASKLET_DISABLED(name, func, data) \
	298	struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
	299
	300
	301	enum
	302	{
	303	TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
	304	TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
	305	};
	306
	307	#ifdef CONFIG_SMP
	308	static inline int tasklet_trylock(struct tasklet_struct *t)
	309	{
	310	return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
	311	}
	312
	313	static inline void tasklet_unlock(struct tasklet_struct *t)
	314	{
	315	smp_mb__before_clear_bit();
	316	clear_bit(TASKLET_STATE_RUN, &(t)->state);
	317	}
	318
	319	static inline void tasklet_unlock_wait(struct tasklet_struct *t)
	320	{
	321	while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
	322	}
	323	#else
	324	#define tasklet_trylock(t) 1
325	#define tasklet_unlock_wait(t) do { } while (0)
326	#define tasklet_unlock(t) do { } while (0)
327	#endif
328
329	extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t));
330
331	static inline void tasklet_schedule(struct tasklet_struct *t)
332	{
333	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
334	__tasklet_schedule(t);
335	}
336
337	extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t));
338
339	static inline void tasklet_hi_schedule(struct tasklet_struct *t)
340	{
341	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
342	__tasklet_hi_schedule(t);
343	}
344
345
346	static inline void tasklet_disable_nosync(struct tasklet_struct *t)
347	{
348	atomic_inc(&t->count);
349	smp_mb__after_atomic_inc();
350	}
351
352	static inline void tasklet_disable(struct tasklet_struct *t)
353	{
354	tasklet_disable_nosync(t);
355	tasklet_unlock_wait(t);
356	smp_mb();
357	}
358
359	static inline void tasklet_enable(struct tasklet_struct *t)
360	{
361	smp_mb__before_atomic_dec();
362	atomic_dec(&t->count);
363	}
364
365	static inline void tasklet_hi_enable(struct tasklet_struct *t)
366	{
367	smp_mb__before_atomic_dec();
368	atomic_dec(&t->count);
369	}
370
371	extern void tasklet_kill(struct tasklet_struct *t);
372	extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
373	extern void tasklet_init(struct tasklet_struct *t,
374	void (*func)(unsigned long), unsigned long data);
375
376	/*
377	* Autoprobing for irqs:
378	*
379	* probe_irq_on() and probe_irq_off() provide robust primitives
380	* for accurate IRQ probing during kernel initialization. They are
381	* reasonably simple to use, are not "fooled" by spurious interrupts,
382	* and, unlike other attempts at IRQ probing, they do not get hung on
383	* stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
384	*
385	* For reasonably foolproof probing, use them as follows:
386	*
387	* 1. clear and/or mask the device's internal interrupt.
388	* 2. sti();
389	* 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
390	* 4. enable the device and cause it to trigger an interrupt.
391	* 5. wait for the device to interrupt, using non-intrusive polling or a delay.
392	* 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
393	* 7. service the device to clear its pending interrupt.
394	* 8. loop again if paranoia is required.
395	*
396	* probe_irq_on() returns a mask of allocated irq's.
397	*
398	* probe_irq_off() takes the mask as a parameter,
399	* and returns the irq number which occurred,
400	* or zero if none occurred, or a negative irq number
401	* if more than one irq occurred.
402	*/
403
404	#if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
405	static inline unsigned long probe_irq_on(void)
406	{
407	return 0;
408	}
409	static inline int probe_irq_off(unsigned long val)
410	{
411	return 0;
412	}
413	static inline unsigned int probe_irq_mask(unsigned long val)
414	{
415	return 0;
416	}
417	#else
418	extern unsigned long probe_irq_on(void); /* returns 0 on failure */
419	extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
420	extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
421	#endif
422
423	#endif