[mirror_ubuntu-zesty-kernel.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 <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
 * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
 *                registered first in an shared interrupt is considered for
 *                performance reasons)
 */
#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
#define IRQF_IRQPOLL		0x00001000

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 __must_check request_irq(unsigned int, irq_handler_t handler,
		       unsigned long, const char *, void *);
extern void free_irq(unsigned int, void *);

struct device;

extern int __must_check 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

extern void disable_irq_nosync(unsigned int irq);
extern void disable_irq(unsigned int irq);
extern void enable_irq(unsigned int irq);

#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)

extern cpumask_t irq_default_affinity;

extern int irq_set_affinity(unsigned int irq, cpumask_t cpumask);
extern int irq_can_set_affinity(unsigned int irq);
extern int irq_select_affinity(unsigned int irq);

#else /* CONFIG_SMP */

static inline int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
{
	return -EINVAL;
}

static inline int irq_can_set_affinity(unsigned int irq)
{
	return 0;
}

static inline int irq_select_affinity(unsigned int irq)  { return 0; }

#endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */

#ifdef CONFIG_GENERIC_HARDIRQS
/*
 * 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_nosync_lockdep_irqsave(irq, flags) \
						disable_irq_nosync(irq)
#  define disable_irq_lockdep(irq)		disable_irq(irq)
#  define enable_irq_lockdep(irq)		enable_irq(irq)
#  define enable_irq_lockdep_irqrestore(irq, flags) \
						enable_irq(irq)
# endif

static inline int enable_irq_wake(unsigned int irq)
{
	return 0;
}

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

/* Some architectures might implement lazy enabling/disabling of
 * interrupts. In some cases, such as stop_machine, we might want
 * to ensure that after a local_irq_disable(), interrupts have
 * really been disabled in hardware. Such architectures need to
 * implement the following hook.
 */
#ifndef hard_irq_disable
#define hard_irq_disable()	do { } while(0)
#endif

/* 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,
#ifdef CONFIG_HIGH_RES_TIMERS
	HRTIMER_SOFTIRQ,
#endif
	RCU_SOFTIRQ, 	/* Preferable RCU should always be the last softirq */

	NR_SOFTIRQS
};

/* 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 *);
};

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

#ifdef CONFIG_PROC_FS
/* Initialize /proc/irq/ */
extern void init_irq_proc(void);
#else
static inline void init_irq_proc(void)
{
}
#endif

int show_interrupts(struct seq_file *p, void *v);

#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>
1da177e4 LT	14	#include <asm/atomic.h>
	15	#include <asm/ptrace.h>
	16	#include <asm/system.h>
	17
6e213616 TG	18	/*
	19	* These correspond to the IORESOURCE_IRQ_* defines in
	20	* linux/ioport.h to select the interrupt line behaviour. When
	21	* requesting an interrupt without specifying a IRQF_TRIGGER, the
	22	* setting should be assumed to be "as already configured", which
	23	* may be as per machine or firmware initialisation.
	24	*/
	25	#define IRQF_TRIGGER_NONE 0x00000000
	26	#define IRQF_TRIGGER_RISING 0x00000001
	27	#define IRQF_TRIGGER_FALLING 0x00000002
	28	#define IRQF_TRIGGER_HIGH 0x00000004
	29	#define IRQF_TRIGGER_LOW 0x00000008
	30	#define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH \| IRQF_TRIGGER_LOW \| \
	31	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING)
	32	#define IRQF_TRIGGER_PROBE 0x00000010
	33
	34	/*
	35	* These flags used only by the kernel as part of the
	36	* irq handling routines.
	37	*
	38	* IRQF_DISABLED - keep irqs disabled when calling the action handler
	39	* IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
	40	* IRQF_SHARED - allow sharing the irq among several devices
	41	* IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
	42	* IRQF_TIMER - Flag to mark this interrupt as timer interrupt
950f4427 TG	43	* IRQF_PERCPU - Interrupt is per cpu
950f4427 TG	44	* IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
d85a60d8 BW	45	* IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
	46	* registered first in an shared interrupt is considered for
	47	* performance reasons)
6e213616 TG	48	*/
	49	#define IRQF_DISABLED 0x00000020
	50	#define IRQF_SAMPLE_RANDOM 0x00000040
	51	#define IRQF_SHARED 0x00000080
	52	#define IRQF_PROBE_SHARED 0x00000100
	53	#define IRQF_TIMER 0x00000200
284c6680	54	#define IRQF_PERCPU 0x00000400
950f4427	55	#define IRQF_NOBALANCING 0x00000800
d85a60d8	56	#define IRQF_IRQPOLL 0x00001000
6e213616	57
7d12e780	58	typedef irqreturn_t (irq_handler_t)(int, void );
da482792	59
1da177e4	60	struct irqaction {
da482792	61	irq_handler_t handler;
1da177e4 LT	62	unsigned long flags;
	63	cpumask_t mask;
	64	const char *name;
	65	void *dev_id;
	66	struct irqaction *next;
	67	int irq;
	68	struct proc_dir_entry *dir;
	69	};
	70
7d12e780	71	extern irqreturn_t no_action(int cpl, void *dev_id);
616883df	72	extern int __must_check request_irq(unsigned int, irq_handler_t handler,
1da177e4 LT	73	unsigned long, const char , void );
	74	extern void free_irq(unsigned int, void *);
	75
0af3678f AV	76	struct device;
0af3678f AV	77
616883df	78	extern int __must_check devm_request_irq(struct device *dev, unsigned int irq,
9ac7849e TH	79	irq_handler_t handler, unsigned long irqflags,
	80	const char devname, void dev_id);
	81	extern void devm_free_irq(struct device dev, unsigned int irq, void dev_id);
	82
d7e9629d IM	83	/*
	84	* On lockdep we dont want to enable hardirqs in hardirq
	85	* context. Use local_irq_enable_in_hardirq() to annotate
	86	* kernel code that has to do this nevertheless (pretty much
	87	* the only valid case is for old/broken hardware that is
	88	* insanely slow).
	89	*
	90	* NOTE: in theory this might break fragile code that relies
	91	* on hardirq delivery - in practice we dont seem to have such
	92	* places left. So the only effect should be slightly increased
	93	* irqs-off latencies.
	94	*/
	95	#ifdef CONFIG_LOCKDEP
	96	# define local_irq_enable_in_hardirq() do { } while (0)
	97	#else
	98	# define local_irq_enable_in_hardirq() local_irq_enable()
	99	#endif
1da177e4	100
1da177e4 LT	101	extern void disable_irq_nosync(unsigned int irq);
	102	extern void disable_irq(unsigned int irq);
	103	extern void enable_irq(unsigned int irq);
ba9a2331	104
d7b90689 RK	105	#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
d7b90689 RK	106
18404756 MK	107	extern cpumask_t irq_default_affinity;
18404756 MK	108
d7b90689 RK	109	extern int irq_set_affinity(unsigned int irq, cpumask_t cpumask);
d7b90689 RK	110	extern int irq_can_set_affinity(unsigned int irq);
18404756	111	extern int irq_select_affinity(unsigned int irq);
d7b90689 RK	112
	113	#else /* CONFIG_SMP */
	114
	115	static inline int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
	116	{
	117	return -EINVAL;
	118	}
	119
	120	static inline int irq_can_set_affinity(unsigned int irq)
	121	{
	122	return 0;
	123	}
	124
18404756 MK	125	static inline int irq_select_affinity(unsigned int irq) { return 0; }
18404756 MK	126
d7b90689 RK	127	#endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
d7b90689 RK	128
e9ed7e72	129	#ifdef CONFIG_GENERIC_HARDIRQS
c01d403b IM	130	/*
	131	* Special lockdep variants of irq disabling/enabling.
	132	* These should be used for locking constructs that
	133	* know that a particular irq context which is disabled,
	134	* and which is the only irq-context user of a lock,
	135	* that it's safe to take the lock in the irq-disabled
	136	* section without disabling hardirqs.
	137	*
	138	* On !CONFIG_LOCKDEP they are equivalent to the normal
	139	* irq disable/enable methods.
	140	*/
	141	static inline void disable_irq_nosync_lockdep(unsigned int irq)
	142	{
	143	disable_irq_nosync(irq);
	144	#ifdef CONFIG_LOCKDEP
	145	local_irq_disable();
	146	#endif
	147	}
	148
e8106b94 AV	149	static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
	150	{
	151	disable_irq_nosync(irq);
	152	#ifdef CONFIG_LOCKDEP
	153	local_irq_save(*flags);
	154	#endif
	155	}
	156
c01d403b IM	157	static inline void disable_irq_lockdep(unsigned int irq)
	158	{
	159	disable_irq(irq);
	160	#ifdef CONFIG_LOCKDEP
	161	local_irq_disable();
	162	#endif
	163	}
	164
	165	static inline void enable_irq_lockdep(unsigned int irq)
	166	{
	167	#ifdef CONFIG_LOCKDEP
	168	local_irq_enable();
	169	#endif
	170	enable_irq(irq);
	171	}
	172
e8106b94 AV	173	static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
	174	{
	175	#ifdef CONFIG_LOCKDEP
	176	local_irq_restore(*flags);
	177	#endif
	178	enable_irq(irq);
	179	}
	180
ba9a2331 TG	181	/* IRQ wakeup (PM) control: */
	182	extern int set_irq_wake(unsigned int irq, unsigned int on);
	183
	184	static inline int enable_irq_wake(unsigned int irq)
	185	{
	186	return set_irq_wake(irq, 1);
	187	}
	188
	189	static inline int disable_irq_wake(unsigned int irq)
	190	{
	191	return set_irq_wake(irq, 0);
	192	}
	193
c01d403b IM	194	#else /* !CONFIG_GENERIC_HARDIRQS */
	195	/*
	196	* NOTE: non-genirq architectures, if they want to support the lock
	197	* validator need to define the methods below in their asm/irq.h
	198	* files, under an #ifdef CONFIG_LOCKDEP section.
	199	*/
b3e2fd9c	200	#ifndef CONFIG_LOCKDEP
c01d403b	201	# define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
b3e2fd9c RZ	202	# define disable_irq_nosync_lockdep_irqsave(irq, flags) \
b3e2fd9c RZ	203	disable_irq_nosync(irq)
c01d403b IM	204	# define disable_irq_lockdep(irq) disable_irq(irq)
c01d403b IM	205	# define enable_irq_lockdep(irq) enable_irq(irq)
b3e2fd9c RZ	206	# define enable_irq_lockdep_irqrestore(irq, flags) \
b3e2fd9c RZ	207	enable_irq(irq)
c01d403b IM	208	# endif
c01d403b IM	209
aa5346a2 GL	210	static inline int enable_irq_wake(unsigned int irq)
	211	{
	212	return 0;
	213	}
	214
	215	static inline int disable_irq_wake(unsigned int irq)
	216	{
	217	return 0;
	218	}
c01d403b	219	#endif /* CONFIG_GENERIC_HARDIRQS */
1da177e4	220
3f74478b AK	221	#ifndef __ARCH_SET_SOFTIRQ_PENDING
	222	#define set_softirq_pending(x) (local_softirq_pending() = (x))
	223	#define or_softirq_pending(x) (local_softirq_pending() \|= (x))
	224	#endif
	225
2d3fbbb3 BH	226	/* Some architectures might implement lazy enabling/disabling of
	227	* interrupts. In some cases, such as stop_machine, we might want
	228	* to ensure that after a local_irq_disable(), interrupts have
	229	* really been disabled in hardware. Such architectures need to
	230	* implement the following hook.
	231	*/
	232	#ifndef hard_irq_disable
	233	#define hard_irq_disable() do { } while(0)
	234	#endif
	235
1da177e4 LT	236	/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
	237	frequency threaded job scheduling. For almost all the purposes
	238	tasklets are more than enough. F.e. all serial device BHs et
	239	al. should be converted to tasklets, not to softirqs.
	240	*/
	241
	242	enum
	243	{
	244	HI_SOFTIRQ=0,
	245	TIMER_SOFTIRQ,
	246	NET_TX_SOFTIRQ,
	247	NET_RX_SOFTIRQ,
ff856bad	248	BLOCK_SOFTIRQ,
c9819f45 CL	249	TASKLET_SOFTIRQ,
c9819f45 CL	250	SCHED_SOFTIRQ,
54cdfdb4 TG	251	#ifdef CONFIG_HIGH_RES_TIMERS
	252	HRTIMER_SOFTIRQ,
	253	#endif
c2d727aa	254	RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
978b0116 AD	255
978b0116 AD	256	NR_SOFTIRQS
1da177e4 LT	257	};
	258
	259	/* softirq mask and active fields moved to irq_cpustat_t in
	260	* asm/hardirq.h to get better cache usage. KAO
	261	*/
	262
	263	struct softirq_action
	264	{
	265	void (action)(struct softirq_action );
1da177e4 LT	266	};
	267
	268	asmlinkage void do_softirq(void);
eb0f1c44	269	asmlinkage void __do_softirq(void);
962cf36c	270	extern void open_softirq(int nr, void (action)(struct softirq_action ));
1da177e4	271	extern void softirq_init(void);
3f74478b	272	#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
b3c97528 HH	273	extern void raise_softirq_irqoff(unsigned int nr);
b3c97528 HH	274	extern void raise_softirq(unsigned int nr);
1da177e4 LT	275
	276
	277	/* Tasklets --- multithreaded analogue of BHs.
	278
	279	Main feature differing them of generic softirqs: tasklet
	280	is running only on one CPU simultaneously.
	281
	282	Main feature differing them of BHs: different tasklets
	283	may be run simultaneously on different CPUs.
	284
	285	Properties:
	286	* If tasklet_schedule() is called, then tasklet is guaranteed
	287	to be executed on some cpu at least once after this.
	288	* If the tasklet is already scheduled, but its excecution is still not
	289	started, it will be executed only once.
	290	* If this tasklet is already running on another CPU (or schedule is called
	291	from tasklet itself), it is rescheduled for later.
	292	* Tasklet is strictly serialized wrt itself, but not
	293	wrt another tasklets. If client needs some intertask synchronization,
	294	he makes it with spinlocks.
	295	*/
	296
	297	struct tasklet_struct
	298	{
	299	struct tasklet_struct *next;
	300	unsigned long state;
	301	atomic_t count;
	302	void (*func)(unsigned long);
	303	unsigned long data;
	304	};
	305
	306	#define DECLARE_TASKLET(name, func, data) \
	307	struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
	308
	309	#define DECLARE_TASKLET_DISABLED(name, func, data) \
	310	struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
	311
	312
	313	enum
	314	{
	315	TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
	316	TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
	317	};
	318
	319	#ifdef CONFIG_SMP
	320	static inline int tasklet_trylock(struct tasklet_struct *t)
	321	{
	322	return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
	323	}
	324
	325	static inline void tasklet_unlock(struct tasklet_struct *t)
	326	{
	327	smp_mb__before_clear_bit();
	328	clear_bit(TASKLET_STATE_RUN, &(t)->state);
	329	}
	330
	331	static inline void tasklet_unlock_wait(struct tasklet_struct *t)
	332	{
	333	while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
	334	}
	335	#else
	336	#define tasklet_trylock(t) 1
	337	#define tasklet_unlock_wait(t) do { } while (0)
	338	#define tasklet_unlock(t) do { } while (0)
339	#endif
340
b3c97528	341	extern void __tasklet_schedule(struct tasklet_struct *t);
1da177e4 LT	342
	343	static inline void tasklet_schedule(struct tasklet_struct *t)
	344	{
	345	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
	346	__tasklet_schedule(t);
	347	}
	348
b3c97528	349	extern void __tasklet_hi_schedule(struct tasklet_struct *t);
1da177e4 LT	350
	351	static inline void tasklet_hi_schedule(struct tasklet_struct *t)
	352	{
	353	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
	354	__tasklet_hi_schedule(t);
	355	}
	356
	357
	358	static inline void tasklet_disable_nosync(struct tasklet_struct *t)
	359	{
	360	atomic_inc(&t->count);
	361	smp_mb__after_atomic_inc();
	362	}
	363
	364	static inline void tasklet_disable(struct tasklet_struct *t)
	365	{
	366	tasklet_disable_nosync(t);
	367	tasklet_unlock_wait(t);
	368	smp_mb();
	369	}
	370
	371	static inline void tasklet_enable(struct tasklet_struct *t)
	372	{
	373	smp_mb__before_atomic_dec();
	374	atomic_dec(&t->count);
	375	}
	376
	377	static inline void tasklet_hi_enable(struct tasklet_struct *t)
	378	{
	379	smp_mb__before_atomic_dec();
	380	atomic_dec(&t->count);
	381	}
	382
	383	extern void tasklet_kill(struct tasklet_struct *t);
	384	extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
	385	extern void tasklet_init(struct tasklet_struct *t,
	386	void (*func)(unsigned long), unsigned long data);
	387
	388	/*
	389	* Autoprobing for irqs:
	390	*
	391	* probe_irq_on() and probe_irq_off() provide robust primitives
	392	* for accurate IRQ probing during kernel initialization. They are
	393	* reasonably simple to use, are not "fooled" by spurious interrupts,
	394	* and, unlike other attempts at IRQ probing, they do not get hung on
	395	* stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
	396	*
	397	* For reasonably foolproof probing, use them as follows:
	398	*
	399	* 1. clear and/or mask the device's internal interrupt.
	400	* 2. sti();
	401	* 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
	402	* 4. enable the device and cause it to trigger an interrupt.
	403	* 5. wait for the device to interrupt, using non-intrusive polling or a delay.
	404	* 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
	405	* 7. service the device to clear its pending interrupt.
	406	* 8. loop again if paranoia is required.
	407	*
	408	* probe_irq_on() returns a mask of allocated irq's.
	409	*
	410	* probe_irq_off() takes the mask as a parameter,
	411	* and returns the irq number which occurred,
	412	* or zero if none occurred, or a negative irq number
	413	* if more than one irq occurred.
414	*/
415
416	#if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
417	static inline unsigned long probe_irq_on(void)
418	{
419	return 0;
420	}
421	static inline int probe_irq_off(unsigned long val)
422	{
423	return 0;
424	}
425	static inline unsigned int probe_irq_mask(unsigned long val)
426	{
427	return 0;
428	}
429	#else
430	extern unsigned long probe_irq_on(void); /* returns 0 on failure */
431	extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
432	extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
433	#endif
434
6168a702 AM	435	#ifdef CONFIG_PROC_FS
	436	/* Initialize /proc/irq/ */
	437	extern void init_irq_proc(void);
	438	#else
	439	static inline void init_irq_proc(void)
	440	{
	441	}
	442	#endif
	443
f74596d0 AB	444	int show_interrupts(struct seq_file p, void v);
f74596d0 AB	445
1da177e4	446	#endif