[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 <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
 * 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

/*
 * Migration helpers. Scheduled for removal in 9/2007
 * Do not use for new code !
 */
static inline
unsigned long __deprecated deprecated_irq_flag(unsigned long flag)
{
	return flag;
}

#define SA_INTERRUPT		deprecated_irq_flag(IRQF_DISABLED)
#define SA_SAMPLE_RANDOM	deprecated_irq_flag(IRQF_SAMPLE_RANDOM)
#define SA_SHIRQ		deprecated_irq_flag(IRQF_SHARED)
#define SA_PROBEIRQ		deprecated_irq_flag(IRQF_PROBE_SHARED)
#define SA_PERCPU		deprecated_irq_flag(IRQF_PERCPU)

#define SA_TRIGGER_LOW		deprecated_irq_flag(IRQF_TRIGGER_LOW)
#define SA_TRIGGER_HIGH		deprecated_irq_flag(IRQF_TRIGGER_HIGH)
#define SA_TRIGGER_FALLING	deprecated_irq_flag(IRQF_TRIGGER_FALLING)
#define SA_TRIGGER_RISING	deprecated_irq_flag(IRQF_TRIGGER_RISING)
#define SA_TRIGGER_MASK		deprecated_irq_flag(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 __must_check request_irq(unsigned int, irq_handler_t handler,
		       unsigned long, const char *, void *);
extern void free_irq(unsigned int, void *);

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

#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_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

#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,
#ifdef CONFIG_HIGH_RES_TIMERS
	HRTIMER_SOFTIRQ,
#endif
};

/* 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

#ifdef CONFIG_PROC_FS
/* Initialize /proc/irq/ */
extern void init_irq_proc(void);
#else
static inline void init_irq_proc(void)
{
}
#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
d85a60d8 BW	47	* IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
	48	* registered first in an shared interrupt is considered for
	49	* performance reasons)
6e213616 TG	50	*/
	51	#define IRQF_DISABLED 0x00000020
	52	#define IRQF_SAMPLE_RANDOM 0x00000040
	53	#define IRQF_SHARED 0x00000080
	54	#define IRQF_PROBE_SHARED 0x00000100
	55	#define IRQF_TIMER 0x00000200
284c6680	56	#define IRQF_PERCPU 0x00000400
950f4427	57	#define IRQF_NOBALANCING 0x00000800
d85a60d8	58	#define IRQF_IRQPOLL 0x00001000
6e213616 TG	59
6e213616 TG	60	/*
0e8638e2	61	* Migration helpers. Scheduled for removal in 9/2007
6e213616 TG	62	* Do not use for new code !
6e213616 TG	63	*/
0e8638e2 TG	64	static inline
	65	unsigned long __deprecated deprecated_irq_flag(unsigned long flag)
	66	{
	67	return flag;
	68	}
6e213616	69
0e8638e2 TG	70	#define SA_INTERRUPT deprecated_irq_flag(IRQF_DISABLED)
	71	#define SA_SAMPLE_RANDOM deprecated_irq_flag(IRQF_SAMPLE_RANDOM)
	72	#define SA_SHIRQ deprecated_irq_flag(IRQF_SHARED)
	73	#define SA_PROBEIRQ deprecated_irq_flag(IRQF_PROBE_SHARED)
	74	#define SA_PERCPU deprecated_irq_flag(IRQF_PERCPU)
	75
	76	#define SA_TRIGGER_LOW deprecated_irq_flag(IRQF_TRIGGER_LOW)
	77	#define SA_TRIGGER_HIGH deprecated_irq_flag(IRQF_TRIGGER_HIGH)
	78	#define SA_TRIGGER_FALLING deprecated_irq_flag(IRQF_TRIGGER_FALLING)
	79	#define SA_TRIGGER_RISING deprecated_irq_flag(IRQF_TRIGGER_RISING)
	80	#define SA_TRIGGER_MASK deprecated_irq_flag(IRQF_TRIGGER_MASK)
6e213616	81
7d12e780	82	typedef irqreturn_t (irq_handler_t)(int, void );
da482792	83
1da177e4	84	struct irqaction {
da482792	85	irq_handler_t handler;
1da177e4 LT	86	unsigned long flags;
	87	cpumask_t mask;
	88	const char *name;
	89	void *dev_id;
	90	struct irqaction *next;
	91	int irq;
	92	struct proc_dir_entry *dir;
	93	};
	94
7d12e780	95	extern irqreturn_t no_action(int cpl, void *dev_id);
616883df	96	extern int __must_check request_irq(unsigned int, irq_handler_t handler,
1da177e4 LT	97	unsigned long, const char , void );
	98	extern void free_irq(unsigned int, void *);
	99
616883df	100	extern int __must_check devm_request_irq(struct device *dev, unsigned int irq,
9ac7849e TH	101	irq_handler_t handler, unsigned long irqflags,
	102	const char devname, void dev_id);
	103	extern void devm_free_irq(struct device dev, unsigned int irq, void dev_id);
	104
d7e9629d IM	105	/*
	106	* On lockdep we dont want to enable hardirqs in hardirq
	107	* context. Use local_irq_enable_in_hardirq() to annotate
	108	* kernel code that has to do this nevertheless (pretty much
	109	* the only valid case is for old/broken hardware that is
	110	* insanely slow).
	111	*
	112	* NOTE: in theory this might break fragile code that relies
	113	* on hardirq delivery - in practice we dont seem to have such
	114	* places left. So the only effect should be slightly increased
	115	* irqs-off latencies.
	116	*/
	117	#ifdef CONFIG_LOCKDEP
	118	# define local_irq_enable_in_hardirq() do { } while (0)
	119	#else
	120	# define local_irq_enable_in_hardirq() local_irq_enable()
	121	#endif
1da177e4 LT	122
	123	#ifdef CONFIG_GENERIC_HARDIRQS
	124	extern void disable_irq_nosync(unsigned int irq);
	125	extern void disable_irq(unsigned int irq);
	126	extern void enable_irq(unsigned int irq);
ba9a2331	127
c01d403b IM	128	/*
	129	* Special lockdep variants of irq disabling/enabling.
	130	* These should be used for locking constructs that
	131	* know that a particular irq context which is disabled,
	132	* and which is the only irq-context user of a lock,
	133	* that it's safe to take the lock in the irq-disabled
	134	* section without disabling hardirqs.
	135	*
	136	* On !CONFIG_LOCKDEP they are equivalent to the normal
	137	* irq disable/enable methods.
	138	*/
	139	static inline void disable_irq_nosync_lockdep(unsigned int irq)
	140	{
	141	disable_irq_nosync(irq);
	142	#ifdef CONFIG_LOCKDEP
	143	local_irq_disable();
	144	#endif
	145	}
	146
e8106b94 AV	147	static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
	148	{
	149	disable_irq_nosync(irq);
	150	#ifdef CONFIG_LOCKDEP
	151	local_irq_save(*flags);
	152	#endif
	153	}
	154
c01d403b IM	155	static inline void disable_irq_lockdep(unsigned int irq)
	156	{
	157	disable_irq(irq);
	158	#ifdef CONFIG_LOCKDEP
	159	local_irq_disable();
	160	#endif
	161	}
	162
	163	static inline void enable_irq_lockdep(unsigned int irq)
	164	{
	165	#ifdef CONFIG_LOCKDEP
	166	local_irq_enable();
	167	#endif
	168	enable_irq(irq);
	169	}
	170
e8106b94 AV	171	static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
	172	{
	173	#ifdef CONFIG_LOCKDEP
	174	local_irq_restore(*flags);
	175	#endif
	176	enable_irq(irq);
	177	}
	178
ba9a2331 TG	179	/* IRQ wakeup (PM) control: */
	180	extern int set_irq_wake(unsigned int irq, unsigned int on);
	181
	182	static inline int enable_irq_wake(unsigned int irq)
	183	{
	184	return set_irq_wake(irq, 1);
	185	}
	186
	187	static inline int disable_irq_wake(unsigned int irq)
	188	{
	189	return set_irq_wake(irq, 0);
	190	}
	191
c01d403b IM	192	#else /* !CONFIG_GENERIC_HARDIRQS */
	193	/*
	194	* NOTE: non-genirq architectures, if they want to support the lock
	195	* validator need to define the methods below in their asm/irq.h
	196	* files, under an #ifdef CONFIG_LOCKDEP section.
	197	*/
b3e2fd9c	198	#ifndef CONFIG_LOCKDEP
c01d403b	199	# define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
b3e2fd9c RZ	200	# define disable_irq_nosync_lockdep_irqsave(irq, flags) \
b3e2fd9c RZ	201	disable_irq_nosync(irq)
c01d403b IM	202	# define disable_irq_lockdep(irq) disable_irq(irq)
c01d403b IM	203	# define enable_irq_lockdep(irq) enable_irq(irq)
b3e2fd9c RZ	204	# define enable_irq_lockdep_irqrestore(irq, flags) \
b3e2fd9c RZ	205	enable_irq(irq)
c01d403b IM	206	# endif
	207
	208	#endif /* CONFIG_GENERIC_HARDIRQS */
1da177e4	209
3f74478b AK	210	#ifndef __ARCH_SET_SOFTIRQ_PENDING
	211	#define set_softirq_pending(x) (local_softirq_pending() = (x))
	212	#define or_softirq_pending(x) (local_softirq_pending() \|= (x))
	213	#endif
	214
1da177e4 LT	215	/*
	216	* Temporary defines for UP kernels, until all code gets fixed.
	217	*/
	218	#ifndef CONFIG_SMP
	219	static inline void __deprecated cli(void)
	220	{
	221	local_irq_disable();
	222	}
	223	static inline void __deprecated sti(void)
	224	{
	225	local_irq_enable();
	226	}
	227	static inline void __deprecated save_flags(unsigned long *x)
	228	{
	229	local_save_flags(*x);
	230	}
ef9ceab2	231	#define save_flags(x) save_flags(&x)
1da177e4 LT	232	static inline void __deprecated restore_flags(unsigned long x)
	233	{
	234	local_irq_restore(x);
	235	}
	236
	237	static inline void __deprecated save_and_cli(unsigned long *x)
	238	{
	239	local_irq_save(*x);
	240	}
	241	#define save_and_cli(x) save_and_cli(&x)
	242	#endif /* CONFIG_SMP */
	243
1da177e4 LT	244	/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
	245	frequency threaded job scheduling. For almost all the purposes
	246	tasklets are more than enough. F.e. all serial device BHs et
	247	al. should be converted to tasklets, not to softirqs.
	248	*/
	249
	250	enum
	251	{
	252	HI_SOFTIRQ=0,
	253	TIMER_SOFTIRQ,
	254	NET_TX_SOFTIRQ,
	255	NET_RX_SOFTIRQ,
ff856bad	256	BLOCK_SOFTIRQ,
c9819f45 CL	257	TASKLET_SOFTIRQ,
c9819f45 CL	258	SCHED_SOFTIRQ,
54cdfdb4 TG	259	#ifdef CONFIG_HIGH_RES_TIMERS
	260	HRTIMER_SOFTIRQ,
	261	#endif
1da177e4 LT	262	};
	263
	264	/* softirq mask and active fields moved to irq_cpustat_t in
	265	* asm/hardirq.h to get better cache usage. KAO
	266	*/
	267
	268	struct softirq_action
	269	{
	270	void (action)(struct softirq_action );
	271	void *data;
	272	};
	273
	274	asmlinkage void do_softirq(void);
	275	extern void open_softirq(int nr, void (action)(struct softirq_action), void *data);
	276	extern void softirq_init(void);
3f74478b	277	#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
1da177e4 LT	278	extern void FASTCALL(raise_softirq_irqoff(unsigned int nr));
	279	extern void FASTCALL(raise_softirq(unsigned int nr));
	280
	281
	282	/* Tasklets --- multithreaded analogue of BHs.
	283
	284	Main feature differing them of generic softirqs: tasklet
	285	is running only on one CPU simultaneously.
	286
	287	Main feature differing them of BHs: different tasklets
	288	may be run simultaneously on different CPUs.
	289
	290	Properties:
	291	* If tasklet_schedule() is called, then tasklet is guaranteed
	292	to be executed on some cpu at least once after this.
	293	* If the tasklet is already scheduled, but its excecution is still not
	294	started, it will be executed only once.
	295	* If this tasklet is already running on another CPU (or schedule is called
	296	from tasklet itself), it is rescheduled for later.
	297	* Tasklet is strictly serialized wrt itself, but not
	298	wrt another tasklets. If client needs some intertask synchronization,
	299	he makes it with spinlocks.
	300	*/
	301
	302	struct tasklet_struct
	303	{
	304	struct tasklet_struct *next;
	305	unsigned long state;
	306	atomic_t count;
	307	void (*func)(unsigned long);
	308	unsigned long data;
	309	};
	310
	311	#define DECLARE_TASKLET(name, func, data) \
	312	struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
	313
	314	#define DECLARE_TASKLET_DISABLED(name, func, data) \
	315	struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
	316
	317
	318	enum
	319	{
	320	TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
	321	TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
	322	};
	323
	324	#ifdef CONFIG_SMP
	325	static inline int tasklet_trylock(struct tasklet_struct *t)
	326	{
	327	return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
	328	}
	329
	330	static inline void tasklet_unlock(struct tasklet_struct *t)
	331	{
	332	smp_mb__before_clear_bit();
	333	clear_bit(TASKLET_STATE_RUN, &(t)->state);
	334	}
	335
	336	static inline void tasklet_unlock_wait(struct tasklet_struct *t)
	337	{
	338	while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
	339	}
	340	#else
	341	#define tasklet_trylock(t) 1
342	#define tasklet_unlock_wait(t) do { } while (0)
343	#define tasklet_unlock(t) do { } while (0)
344	#endif
345
346	extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t));
347
348	static inline void tasklet_schedule(struct tasklet_struct *t)
349	{
350	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
351	__tasklet_schedule(t);
352	}
353
354	extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t));
355
356	static inline void tasklet_hi_schedule(struct tasklet_struct *t)
357	{
358	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
359	__tasklet_hi_schedule(t);
360	}
361
362
363	static inline void tasklet_disable_nosync(struct tasklet_struct *t)
364	{
365	atomic_inc(&t->count);
366	smp_mb__after_atomic_inc();
367	}
368
369	static inline void tasklet_disable(struct tasklet_struct *t)
370	{
371	tasklet_disable_nosync(t);
372	tasklet_unlock_wait(t);
373	smp_mb();
374	}
375
376	static inline void tasklet_enable(struct tasklet_struct *t)
377	{
378	smp_mb__before_atomic_dec();
379	atomic_dec(&t->count);
380	}
381
382	static inline void tasklet_hi_enable(struct tasklet_struct *t)
383	{
384	smp_mb__before_atomic_dec();
385	atomic_dec(&t->count);
386	}
387
388	extern void tasklet_kill(struct tasklet_struct *t);
389	extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
390	extern void tasklet_init(struct tasklet_struct *t,
391	void (*func)(unsigned long), unsigned long data);
392
393	/*
394	* Autoprobing for irqs:
395	*
396	* probe_irq_on() and probe_irq_off() provide robust primitives
397	* for accurate IRQ probing during kernel initialization. They are
398	* reasonably simple to use, are not "fooled" by spurious interrupts,
399	* and, unlike other attempts at IRQ probing, they do not get hung on
400	* stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
401	*
402	* For reasonably foolproof probing, use them as follows:
403	*
404	* 1. clear and/or mask the device's internal interrupt.
405	* 2. sti();
406	* 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
407	* 4. enable the device and cause it to trigger an interrupt.
408	* 5. wait for the device to interrupt, using non-intrusive polling or a delay.
409	* 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
410	* 7. service the device to clear its pending interrupt.
411	* 8. loop again if paranoia is required.
412	*
413	* probe_irq_on() returns a mask of allocated irq's.
414	*
415	* probe_irq_off() takes the mask as a parameter,
416	* and returns the irq number which occurred,
417	* or zero if none occurred, or a negative irq number
418	* if more than one irq occurred.
419	*/
420
421	#if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
422	static inline unsigned long probe_irq_on(void)
423	{
424	return 0;
425	}
426	static inline int probe_irq_off(unsigned long val)
427	{
428	return 0;
429	}
430	static inline unsigned int probe_irq_mask(unsigned long val)
431	{
432	return 0;
433	}
434	#else
435	extern unsigned long probe_irq_on(void); /* returns 0 on failure */
436	extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
437	extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
438	#endif
439
6168a702 AM	440	#ifdef CONFIG_PROC_FS
	441	/* Initialize /proc/irq/ */
	442	extern void init_irq_proc(void);
	443	#else
	444	static inline void init_irq_proc(void)
	445	{
	446	}
	447	#endif
	448
1da177e4	449	#endif