[mirror_ubuntu-bionic-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);

#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

/*
 * 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 */

/* 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 */
};

/* 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

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
e9ed7e72	105	#ifdef CONFIG_GENERIC_HARDIRQS
c01d403b IM	106	/*
	107	* Special lockdep variants of irq disabling/enabling.
	108	* These should be used for locking constructs that
	109	* know that a particular irq context which is disabled,
	110	* and which is the only irq-context user of a lock,
	111	* that it's safe to take the lock in the irq-disabled
	112	* section without disabling hardirqs.
	113	*
	114	* On !CONFIG_LOCKDEP they are equivalent to the normal
	115	* irq disable/enable methods.
	116	*/
	117	static inline void disable_irq_nosync_lockdep(unsigned int irq)
	118	{
	119	disable_irq_nosync(irq);
	120	#ifdef CONFIG_LOCKDEP
	121	local_irq_disable();
	122	#endif
	123	}
	124
e8106b94 AV	125	static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
	126	{
	127	disable_irq_nosync(irq);
	128	#ifdef CONFIG_LOCKDEP
	129	local_irq_save(*flags);
	130	#endif
	131	}
	132
c01d403b IM	133	static inline void disable_irq_lockdep(unsigned int irq)
	134	{
	135	disable_irq(irq);
	136	#ifdef CONFIG_LOCKDEP
	137	local_irq_disable();
	138	#endif
	139	}
	140
	141	static inline void enable_irq_lockdep(unsigned int irq)
	142	{
	143	#ifdef CONFIG_LOCKDEP
	144	local_irq_enable();
	145	#endif
	146	enable_irq(irq);
	147	}
	148
e8106b94 AV	149	static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
	150	{
	151	#ifdef CONFIG_LOCKDEP
	152	local_irq_restore(*flags);
	153	#endif
	154	enable_irq(irq);
	155	}
	156
ba9a2331 TG	157	/* IRQ wakeup (PM) control: */
	158	extern int set_irq_wake(unsigned int irq, unsigned int on);
	159
	160	static inline int enable_irq_wake(unsigned int irq)
	161	{
	162	return set_irq_wake(irq, 1);
	163	}
	164
	165	static inline int disable_irq_wake(unsigned int irq)
	166	{
	167	return set_irq_wake(irq, 0);
	168	}
	169
c01d403b IM	170	#else /* !CONFIG_GENERIC_HARDIRQS */
	171	/*
	172	* NOTE: non-genirq architectures, if they want to support the lock
	173	* validator need to define the methods below in their asm/irq.h
	174	* files, under an #ifdef CONFIG_LOCKDEP section.
	175	*/
b3e2fd9c	176	#ifndef CONFIG_LOCKDEP
c01d403b	177	# define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq)
b3e2fd9c RZ	178	# define disable_irq_nosync_lockdep_irqsave(irq, flags) \
b3e2fd9c RZ	179	disable_irq_nosync(irq)
c01d403b IM	180	# define disable_irq_lockdep(irq) disable_irq(irq)
c01d403b IM	181	# define enable_irq_lockdep(irq) enable_irq(irq)
b3e2fd9c RZ	182	# define enable_irq_lockdep_irqrestore(irq, flags) \
b3e2fd9c RZ	183	enable_irq(irq)
c01d403b IM	184	# endif
c01d403b IM	185
aa5346a2 GL	186	static inline int enable_irq_wake(unsigned int irq)
	187	{
	188	return 0;
	189	}
	190
	191	static inline int disable_irq_wake(unsigned int irq)
	192	{
	193	return 0;
	194	}
c01d403b	195	#endif /* CONFIG_GENERIC_HARDIRQS */
1da177e4	196
3f74478b AK	197	#ifndef __ARCH_SET_SOFTIRQ_PENDING
	198	#define set_softirq_pending(x) (local_softirq_pending() = (x))
	199	#define or_softirq_pending(x) (local_softirq_pending() \|= (x))
	200	#endif
	201
1da177e4 LT	202	/*
	203	* Temporary defines for UP kernels, until all code gets fixed.
	204	*/
	205	#ifndef CONFIG_SMP
	206	static inline void __deprecated cli(void)
	207	{
	208	local_irq_disable();
	209	}
	210	static inline void __deprecated sti(void)
	211	{
	212	local_irq_enable();
	213	}
	214	static inline void __deprecated save_flags(unsigned long *x)
	215	{
	216	local_save_flags(*x);
	217	}
ef9ceab2	218	#define save_flags(x) save_flags(&x)
1da177e4 LT	219	static inline void __deprecated restore_flags(unsigned long x)
	220	{
	221	local_irq_restore(x);
	222	}
	223
	224	static inline void __deprecated save_and_cli(unsigned long *x)
	225	{
	226	local_irq_save(*x);
	227	}
	228	#define save_and_cli(x) save_and_cli(&x)
	229	#endif /* CONFIG_SMP */
	230
2d3fbbb3 BH	231	/* Some architectures might implement lazy enabling/disabling of
	232	* interrupts. In some cases, such as stop_machine, we might want
	233	* to ensure that after a local_irq_disable(), interrupts have
	234	* really been disabled in hardware. Such architectures need to
	235	* implement the following hook.
	236	*/
	237	#ifndef hard_irq_disable
	238	#define hard_irq_disable() do { } while(0)
	239	#endif
	240
1da177e4 LT	241	/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
	242	frequency threaded job scheduling. For almost all the purposes
	243	tasklets are more than enough. F.e. all serial device BHs et
	244	al. should be converted to tasklets, not to softirqs.
	245	*/
	246
	247	enum
	248	{
	249	HI_SOFTIRQ=0,
	250	TIMER_SOFTIRQ,
	251	NET_TX_SOFTIRQ,
	252	NET_RX_SOFTIRQ,
ff856bad	253	BLOCK_SOFTIRQ,
c9819f45 CL	254	TASKLET_SOFTIRQ,
c9819f45 CL	255	SCHED_SOFTIRQ,
54cdfdb4 TG	256	#ifdef CONFIG_HIGH_RES_TIMERS
	257	HRTIMER_SOFTIRQ,
	258	#endif
c2d727aa	259	RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
1da177e4 LT	260	};
	261
	262	/* softirq mask and active fields moved to irq_cpustat_t in
	263	* asm/hardirq.h to get better cache usage. KAO
	264	*/
	265
	266	struct softirq_action
	267	{
	268	void (action)(struct softirq_action );
	269	void *data;
	270	};
	271
	272	asmlinkage void do_softirq(void);
	273	extern void open_softirq(int nr, void (action)(struct softirq_action), void *data);
	274	extern void softirq_init(void);
3f74478b	275	#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
1da177e4 LT	276	extern void FASTCALL(raise_softirq_irqoff(unsigned int nr));
	277	extern void FASTCALL(raise_softirq(unsigned int nr));
	278
	279
	280	/* Tasklets --- multithreaded analogue of BHs.
	281
	282	Main feature differing them of generic softirqs: tasklet
	283	is running only on one CPU simultaneously.
	284
	285	Main feature differing them of BHs: different tasklets
	286	may be run simultaneously on different CPUs.
	287
	288	Properties:
	289	* If tasklet_schedule() is called, then tasklet is guaranteed
	290	to be executed on some cpu at least once after this.
	291	* If the tasklet is already scheduled, but its excecution is still not
	292	started, it will be executed only once.
	293	* If this tasklet is already running on another CPU (or schedule is called
	294	from tasklet itself), it is rescheduled for later.
	295	* Tasklet is strictly serialized wrt itself, but not
	296	wrt another tasklets. If client needs some intertask synchronization,
	297	he makes it with spinlocks.
	298	*/
	299
	300	struct tasklet_struct
	301	{
	302	struct tasklet_struct *next;
	303	unsigned long state;
	304	atomic_t count;
	305	void (*func)(unsigned long);
	306	unsigned long data;
	307	};
	308
	309	#define DECLARE_TASKLET(name, func, data) \
	310	struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
	311
	312	#define DECLARE_TASKLET_DISABLED(name, func, data) \
	313	struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
	314
	315
	316	enum
	317	{
	318	TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
	319	TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
	320	};
	321
	322	#ifdef CONFIG_SMP
	323	static inline int tasklet_trylock(struct tasklet_struct *t)
	324	{
	325	return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
	326	}
	327
	328	static inline void tasklet_unlock(struct tasklet_struct *t)
	329	{
	330	smp_mb__before_clear_bit();
	331	clear_bit(TASKLET_STATE_RUN, &(t)->state);
	332	}
	333
	334	static inline void tasklet_unlock_wait(struct tasklet_struct *t)
	335	{
	336	while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
	337	}
	338	#else
	339	#define tasklet_trylock(t) 1
340	#define tasklet_unlock_wait(t) do { } while (0)
341	#define tasklet_unlock(t) do { } while (0)
342	#endif
343
344	extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t));
345
346	static inline void tasklet_schedule(struct tasklet_struct *t)
347	{
348	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
349	__tasklet_schedule(t);
350	}
351
352	extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t));
353
354	static inline void tasklet_hi_schedule(struct tasklet_struct *t)
355	{
356	if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
357	__tasklet_hi_schedule(t);
358	}
359
360
361	static inline void tasklet_disable_nosync(struct tasklet_struct *t)
362	{
363	atomic_inc(&t->count);
364	smp_mb__after_atomic_inc();
365	}
366
367	static inline void tasklet_disable(struct tasklet_struct *t)
368	{
369	tasklet_disable_nosync(t);
370	tasklet_unlock_wait(t);
371	smp_mb();
372	}
373
374	static inline void tasklet_enable(struct tasklet_struct *t)
375	{
376	smp_mb__before_atomic_dec();
377	atomic_dec(&t->count);
378	}
379
380	static inline void tasklet_hi_enable(struct tasklet_struct *t)
381	{
382	smp_mb__before_atomic_dec();
383	atomic_dec(&t->count);
384	}
385
386	extern void tasklet_kill(struct tasklet_struct *t);
387	extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
388	extern void tasklet_init(struct tasklet_struct *t,
389	void (*func)(unsigned long), unsigned long data);
390
391	/*
392	* Autoprobing for irqs:
393	*
394	* probe_irq_on() and probe_irq_off() provide robust primitives
395	* for accurate IRQ probing during kernel initialization. They are
396	* reasonably simple to use, are not "fooled" by spurious interrupts,
397	* and, unlike other attempts at IRQ probing, they do not get hung on
398	* stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
399	*
400	* For reasonably foolproof probing, use them as follows:
401	*
402	* 1. clear and/or mask the device's internal interrupt.
403	* 2. sti();
404	* 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
405	* 4. enable the device and cause it to trigger an interrupt.
406	* 5. wait for the device to interrupt, using non-intrusive polling or a delay.
407	* 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
408	* 7. service the device to clear its pending interrupt.
409	* 8. loop again if paranoia is required.
410	*
411	* probe_irq_on() returns a mask of allocated irq's.
412	*
413	* probe_irq_off() takes the mask as a parameter,
414	* and returns the irq number which occurred,
415	* or zero if none occurred, or a negative irq number
416	* if more than one irq occurred.
417	*/
418
419	#if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
420	static inline unsigned long probe_irq_on(void)
421	{
422	return 0;
423	}
424	static inline int probe_irq_off(unsigned long val)
425	{
426	return 0;
427	}
428	static inline unsigned int probe_irq_mask(unsigned long val)
429	{
430	return 0;
431	}
432	#else
433	extern unsigned long probe_irq_on(void); /* returns 0 on failure */
434	extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
435	extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
436	#endif
437
6168a702 AM	438	#ifdef CONFIG_PROC_FS
	439	/* Initialize /proc/irq/ */
	440	extern void init_irq_proc(void);
	441	#else
	442	static inline void init_irq_proc(void)
	443	{
	444	}
	445	#endif
	446
f74596d0 AB	447	int show_interrupts(struct seq_file p, void v);
f74596d0 AB	448
1da177e4	449	#endif