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

#ifndef _LINUX_IRQ_H
#define _LINUX_IRQ_H

/*
 * Please do not include this file in generic code.  There is currently
 * no requirement for any architecture to implement anything held
 * within this file.
 *
 * Thanks. --rmk
 */

#include <linux/smp.h>

#ifndef CONFIG_S390

#include <linux/linkage.h>
#include <linux/cache.h>
#include <linux/spinlock.h>
#include <linux/cpumask.h>
#include <linux/irqreturn.h>
#include <linux/errno.h>

#include <asm/irq.h>
#include <asm/ptrace.h>
#include <asm/irq_regs.h>

struct irq_desc;
typedef	void (*irq_flow_handler_t)(unsigned int irq,
					    struct irq_desc *desc);


/*
 * IRQ line status.
 *
 * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
 *
 * IRQ types
 */
#define IRQ_TYPE_NONE		0x00000000	/* Default, unspecified type */
#define IRQ_TYPE_EDGE_RISING	0x00000001	/* Edge rising type */
#define IRQ_TYPE_EDGE_FALLING	0x00000002	/* Edge falling type */
#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
#define IRQ_TYPE_LEVEL_HIGH	0x00000004	/* Level high type */
#define IRQ_TYPE_LEVEL_LOW	0x00000008	/* Level low type */
#define IRQ_TYPE_SENSE_MASK	0x0000000f	/* Mask of the above */
#define IRQ_TYPE_PROBE		0x00000010	/* Probing in progress */

/* Internal flags */
#define IRQ_INPROGRESS		0x00000100	/* IRQ handler active - do not enter! */
#define IRQ_DISABLED		0x00000200	/* IRQ disabled - do not enter! */
#define IRQ_PENDING		0x00000400	/* IRQ pending - replay on enable */
#define IRQ_REPLAY		0x00000800	/* IRQ has been replayed but not acked yet */
#define IRQ_AUTODETECT		0x00001000	/* IRQ is being autodetected */
#define IRQ_WAITING		0x00002000	/* IRQ not yet seen - for autodetection */
#define IRQ_LEVEL		0x00004000	/* IRQ level triggered */
#define IRQ_MASKED		0x00008000	/* IRQ masked - shouldn't be seen again */
#define IRQ_PER_CPU		0x00010000	/* IRQ is per CPU */
#define IRQ_NOPROBE		0x00020000	/* IRQ is not valid for probing */
#define IRQ_NOREQUEST		0x00040000	/* IRQ cannot be requested */
#define IRQ_NOAUTOEN		0x00080000	/* IRQ will not be enabled on request irq */
#define IRQ_WAKEUP		0x00100000	/* IRQ triggers system wakeup */
#define IRQ_MOVE_PENDING	0x00200000	/* need to re-target IRQ destination */
#define IRQ_NO_BALANCING	0x00400000	/* IRQ is excluded from balancing */
#define IRQ_SPURIOUS_DISABLED	0x00800000	/* IRQ was disabled by the spurious trap */
#define IRQ_MOVE_PCNTXT	0x01000000	/* IRQ migration from process context */

#ifdef CONFIG_IRQ_PER_CPU
# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
# define IRQ_NO_BALANCING_MASK	(IRQ_PER_CPU | IRQ_NO_BALANCING)
#else
# define CHECK_IRQ_PER_CPU(var) 0
# define IRQ_NO_BALANCING_MASK	IRQ_NO_BALANCING
#endif

struct proc_dir_entry;
struct msi_desc;

/**
 * struct irq_chip - hardware interrupt chip descriptor
 *
 * @name:		name for /proc/interrupts
 * @startup:		start up the interrupt (defaults to ->enable if NULL)
 * @shutdown:		shut down the interrupt (defaults to ->disable if NULL)
 * @enable:		enable the interrupt (defaults to chip->unmask if NULL)
 * @disable:		disable the interrupt (defaults to chip->mask if NULL)
 * @ack:		start of a new interrupt
 * @mask:		mask an interrupt source
 * @mask_ack:		ack and mask an interrupt source
 * @unmask:		unmask an interrupt source
 * @eoi:		end of interrupt - chip level
 * @end:		end of interrupt - flow level
 * @set_affinity:	set the CPU affinity on SMP machines
 * @retrigger:		resend an IRQ to the CPU
 * @set_type:		set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
 * @set_wake:		enable/disable power-management wake-on of an IRQ
 *
 * @release:		release function solely used by UML
 * @typename:		obsoleted by name, kept as migration helper
 */
struct irq_chip {
	const char	*name;
	unsigned int	(*startup)(unsigned int irq);
	void		(*shutdown)(unsigned int irq);
	void		(*enable)(unsigned int irq);
	void		(*disable)(unsigned int irq);

	void		(*ack)(unsigned int irq);
	void		(*mask)(unsigned int irq);
	void		(*mask_ack)(unsigned int irq);
	void		(*unmask)(unsigned int irq);
	void		(*eoi)(unsigned int irq);

	void		(*end)(unsigned int irq);
	void		(*set_affinity)(unsigned int irq, cpumask_t dest);
	int		(*retrigger)(unsigned int irq);
	int		(*set_type)(unsigned int irq, unsigned int flow_type);
	int		(*set_wake)(unsigned int irq, unsigned int on);

	/* Currently used only by UML, might disappear one day.*/
#ifdef CONFIG_IRQ_RELEASE_METHOD
	void		(*release)(unsigned int irq, void *dev_id);
#endif
	/*
	 * For compatibility, ->typename is copied into ->name.
	 * Will disappear.
	 */
	const char	*typename;
};

struct timer_rand_state;
struct irq_2_iommu;
/**
 * struct irq_desc - interrupt descriptor
 *
 * @handle_irq:		highlevel irq-events handler [if NULL, __do_IRQ()]
 * @chip:		low level interrupt hardware access
 * @msi_desc:		MSI descriptor
 * @handler_data:	per-IRQ data for the irq_chip methods
 * @chip_data:		platform-specific per-chip private data for the chip
 *			methods, to allow shared chip implementations
 * @action:		the irq action chain
 * @status:		status information
 * @depth:		disable-depth, for nested irq_disable() calls
 * @wake_depth:		enable depth, for multiple set_irq_wake() callers
 * @irq_count:		stats field to detect stalled irqs
 * @irqs_unhandled:	stats field for spurious unhandled interrupts
 * @last_unhandled:	aging timer for unhandled count
 * @lock:		locking for SMP
 * @affinity:		IRQ affinity on SMP
 * @cpu:		cpu index useful for balancing
 * @pending_mask:	pending rebalanced interrupts
 * @dir:		/proc/irq/ procfs entry
 * @affinity_entry:	/proc/irq/smp_affinity procfs entry on SMP
 * @name:		flow handler name for /proc/interrupts output
 */
struct irq_desc {
	unsigned int		irq;
#ifdef CONFIG_HAVE_SPARSE_IRQ
	struct irq_desc		*next;
	struct timer_rand_state *timer_rand_state;
#endif
#ifdef CONFIG_HAVE_DYN_ARRAY
	unsigned int            *kstat_irqs;
#else
	unsigned int            kstat_irqs[NR_CPUS];
#endif
#if defined(CONFIG_INTR_REMAP) && defined(CONFIG_HAVE_SPARSE_IRQ)
       struct irq_2_iommu      *irq_2_iommu;
#endif
	irq_flow_handler_t	handle_irq;
	struct irq_chip		*chip;
	struct msi_desc		*msi_desc;
	void			*handler_data;
	void			*chip_data;
	struct irqaction	*action;	/* IRQ action list */
	unsigned int		status;		/* IRQ status */

	unsigned int		depth;		/* nested irq disables */
	unsigned int		wake_depth;	/* nested wake enables */
	unsigned int		irq_count;	/* For detecting broken IRQs */
	unsigned int		irqs_unhandled;
	unsigned long		last_unhandled;	/* Aging timer for unhandled count */
	spinlock_t		lock;
#ifdef CONFIG_SMP
	cpumask_t		affinity;
	unsigned int		cpu;
#endif
#ifdef CONFIG_GENERIC_PENDING_IRQ
	cpumask_t		pending_mask;
#endif
#ifdef CONFIG_PROC_FS
	struct proc_dir_entry	*dir;
#endif
	const char		*name;
} ____cacheline_internodealigned_in_smp;

extern struct irq_desc *irq_to_desc(unsigned int irq);
extern struct irq_desc *irq_to_desc_alloc(unsigned int irq);

#ifndef CONFIG_HAVE_SPARSE_IRQ

#ifndef CONFIG_HAVE_DYN_ARRAY
/* could be removed if we get rid of all irq_desc reference */
extern struct irq_desc irq_desc[NR_IRQS];
#else
extern struct irq_desc *irq_desc;
#endif

#ifdef CONFIG_GENERIC_HARDIRQS
#define for_each_irq_desc(irq, desc)		\
	for (irq = 0, desc = irq_desc; irq < nr_irqs; irq++, desc = &irq_desc[irq])
#endif

#else

extern struct irq_desc *sparse_irqs;
#define for_each_irq_desc(irqX, desc)		\
	for (desc = sparse_irqs, irqX = desc->irq; desc; desc = desc->next, irqX = desc ? desc->irq : -1U)

#endif

#define kstat_irqs_this_cpu(DESC) \
	((DESC)->kstat_irqs[smp_processor_id()])

/*
 * Migration helpers for obsolete names, they will go away:
 */
#define hw_interrupt_type	irq_chip
typedef struct irq_chip		hw_irq_controller;
#define no_irq_type		no_irq_chip
typedef struct irq_desc		irq_desc_t;

/*
 * Pick up the arch-dependent methods:
 */
#include <asm/hw_irq.h>

extern int setup_irq(unsigned int irq, struct irqaction *new);

#ifdef CONFIG_GENERIC_HARDIRQS

#ifdef CONFIG_SMP

#ifdef CONFIG_GENERIC_PENDING_IRQ

void set_pending_irq(unsigned int irq, cpumask_t mask);
void move_native_irq(int irq);
void move_masked_irq(int irq);

#else /* CONFIG_GENERIC_PENDING_IRQ */

static inline void move_irq(int irq)
{
}

static inline void move_native_irq(int irq)
{
}

static inline void move_masked_irq(int irq)
{
}

static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
{
}

#endif /* CONFIG_GENERIC_PENDING_IRQ */

#else /* CONFIG_SMP */

#define move_native_irq(x)
#define move_masked_irq(x)

#endif /* CONFIG_SMP */

extern int no_irq_affinity;

static inline int irq_balancing_disabled(unsigned int irq)
{
	struct irq_desc *desc;

	desc = irq_to_desc(irq);
	return desc->status & IRQ_NO_BALANCING_MASK;
}

/* Handle irq action chains: */
extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);

/*
 * Built-in IRQ handlers for various IRQ types,
 * callable via desc->chip->handle_irq()
 */
extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);

/*
 * Monolithic do_IRQ implementation.
 */
#ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
extern unsigned int __do_IRQ(unsigned int irq);
#endif

/*
 * Architectures call this to let the generic IRQ layer
 * handle an interrupt. If the descriptor is attached to an
 * irqchip-style controller then we call the ->handle_irq() handler,
 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 */
static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
{
#ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
	desc->handle_irq(irq, desc);
#else
	if (likely(desc->handle_irq))
		desc->handle_irq(irq, desc);
	else
		__do_IRQ(irq);
#endif
}

static inline void generic_handle_irq(unsigned int irq)
{
	generic_handle_irq_desc(irq, irq_to_desc(irq));
}

/* Handling of unhandled and spurious interrupts: */
extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
			   int action_ret);

/* Resending of interrupts :*/
void check_irq_resend(struct irq_desc *desc, unsigned int irq);

/* Enable/disable irq debugging output: */
extern int noirqdebug_setup(char *str);

/* Checks whether the interrupt can be requested by request_irq(): */
extern int can_request_irq(unsigned int irq, unsigned long irqflags);

/* Dummy irq-chip implementations: */
extern struct irq_chip no_irq_chip;
extern struct irq_chip dummy_irq_chip;

extern void
set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
			 irq_flow_handler_t handle);
extern void
set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
			      irq_flow_handler_t handle, const char *name);

extern void
__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
		  const char *name);

/* caller has locked the irq_desc and both params are valid */
static inline void __set_irq_handler_unlocked(int irq,
					      irq_flow_handler_t handler)
{
	struct irq_desc *desc;

	desc = irq_to_desc(irq);
	desc->handle_irq = handler;
}

/*
 * Set a highlevel flow handler for a given IRQ:
 */
static inline void
set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
{
	__set_irq_handler(irq, handle, 0, NULL);
}

/*
 * Set a highlevel chained flow handler for a given IRQ.
 * (a chained handler is automatically enabled and set to
 *  IRQ_NOREQUEST and IRQ_NOPROBE)
 */
static inline void
set_irq_chained_handler(unsigned int irq,
			irq_flow_handler_t handle)
{
	__set_irq_handler(irq, handle, 1, NULL);
}

extern void set_irq_noprobe(unsigned int irq);
extern void set_irq_probe(unsigned int irq);

/* Handle dynamic irq creation and destruction */
extern unsigned int create_irq_nr(unsigned int irq_want);
extern int create_irq(void);
extern void destroy_irq(unsigned int irq);

/* Test to see if a driver has successfully requested an irq */
static inline int irq_has_action(unsigned int irq)
{
	struct irq_desc *desc = irq_to_desc(irq);
	return desc->action != NULL;
}

/* Dynamic irq helper functions */
extern void dynamic_irq_init(unsigned int irq);
extern void dynamic_irq_cleanup(unsigned int irq);

/* Set/get chip/data for an IRQ: */
extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
extern int set_irq_data(unsigned int irq, void *data);
extern int set_irq_chip_data(unsigned int irq, void *data);
extern int set_irq_type(unsigned int irq, unsigned int type);
extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);

#define get_irq_chip(irq)	(irq_to_desc(irq)->chip)
#define get_irq_chip_data(irq)	(irq_to_desc(irq)->chip_data)
#define get_irq_data(irq)	(irq_to_desc(irq)->handler_data)
#define get_irq_msi(irq)	(irq_to_desc(irq)->msi_desc)

#endif /* CONFIG_GENERIC_HARDIRQS */

#endif /* !CONFIG_S390 */

#endif /* _LINUX_IRQ_H */
Commit	Line	Data
06fcb0c6 IM	1	#ifndef _LINUX_IRQ_H
06fcb0c6 IM	2	#define _LINUX_IRQ_H
1da177e4 LT	3
	4	/*
	5	* Please do not include this file in generic code. There is currently
	6	* no requirement for any architecture to implement anything held
	7	* within this file.
	8	*
	9	* Thanks. --rmk
	10	*/
	11
23f9b317	12	#include <linux/smp.h>
1da177e4	13
06fcb0c6	14	#ifndef CONFIG_S390
1da177e4 LT	15
	16	#include <linux/linkage.h>
	17	#include <linux/cache.h>
	18	#include <linux/spinlock.h>
	19	#include <linux/cpumask.h>
908dcecd	20	#include <linux/irqreturn.h>
77904fd6	21	#include <linux/errno.h>
1da177e4 LT	22
	23	#include <asm/irq.h>
	24	#include <asm/ptrace.h>
7d12e780	25	#include <asm/irq_regs.h>
1da177e4	26
57a58a94	27	struct irq_desc;
ec701584	28	typedef void (*irq_flow_handler_t)(unsigned int irq,
7d12e780	29	struct irq_desc *desc);
57a58a94 DH	30
57a58a94 DH	31
1da177e4 LT	32	/*
1da177e4 LT	33	* IRQ line status.
6e213616	34	*
950f4427	35	* Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
6e213616 TG	36	*
6e213616 TG	37	* IRQ types
1da177e4	38	*/
6e213616 TG	39	#define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */
	40	#define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */
	41	#define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */
	42	#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING \| IRQ_TYPE_EDGE_RISING)
	43	#define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */
	44	#define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */
	45	#define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */
	46	#define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */
	47
	48	/* Internal flags */
950f4427 TG	49	#define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */
	50	#define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */
	51	#define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */
	52	#define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */
	53	#define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */
	54	#define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */
	55	#define IRQ_LEVEL 0x00004000 /* IRQ level triggered */
	56	#define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */
	57	#define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */
	58	#define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */
	59	#define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */
	60	#define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */
d7e25f33 IM	61	#define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */
	62	#define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */
	63	#define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */
1adb0850	64	#define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */
72b1e22d	65	#define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */
950f4427	66
0d7012a9	67	#ifdef CONFIG_IRQ_PER_CPU
f26fdd59	68	# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
950f4427	69	# define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU \| IRQ_NO_BALANCING)
f26fdd59 KW	70	#else
f26fdd59 KW	71	# define CHECK_IRQ_PER_CPU(var) 0
950f4427	72	# define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
f26fdd59	73	#endif
1da177e4	74
6a6de9ef	75	struct proc_dir_entry;
5b912c10	76	struct msi_desc;
6a6de9ef	77
8fee5c36	78	/**
6a6de9ef	79	* struct irq_chip - hardware interrupt chip descriptor
8fee5c36 IM	80	*
	81	* @name: name for /proc/interrupts
	82	* @startup: start up the interrupt (defaults to ->enable if NULL)
	83	* @shutdown: shut down the interrupt (defaults to ->disable if NULL)
	84	* @enable: enable the interrupt (defaults to chip->unmask if NULL)
	85	* @disable: disable the interrupt (defaults to chip->mask if NULL)
8fee5c36 IM	86	* @ack: start of a new interrupt
	87	* @mask: mask an interrupt source
	88	* @mask_ack: ack and mask an interrupt source
	89	* @unmask: unmask an interrupt source
47c2a3aa IM	90	* @eoi: end of interrupt - chip level
47c2a3aa IM	91	* @end: end of interrupt - flow level
8fee5c36 IM	92	* @set_affinity: set the CPU affinity on SMP machines
	93	* @retrigger: resend an IRQ to the CPU
	94	* @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
	95	* @set_wake: enable/disable power-management wake-on of an IRQ
	96	*
	97	* @release: release function solely used by UML
6a6de9ef	98	* @typename: obsoleted by name, kept as migration helper
1da177e4	99	*/
6a6de9ef TG	100	struct irq_chip {
6a6de9ef TG	101	const char *name;
71d218b7 IM	102	unsigned int (*startup)(unsigned int irq);
	103	void (*shutdown)(unsigned int irq);
	104	void (*enable)(unsigned int irq);
	105	void (*disable)(unsigned int irq);
6a6de9ef	106
71d218b7	107	void (*ack)(unsigned int irq);
6a6de9ef TG	108	void (*mask)(unsigned int irq);
	109	void (*mask_ack)(unsigned int irq);
	110	void (*unmask)(unsigned int irq);
47c2a3aa	111	void (*eoi)(unsigned int irq);
6a6de9ef	112
71d218b7 IM	113	void (*end)(unsigned int irq);
71d218b7 IM	114	void (*set_affinity)(unsigned int irq, cpumask_t dest);
c0ad90a3	115	int (*retrigger)(unsigned int irq);
6a6de9ef TG	116	int (*set_type)(unsigned int irq, unsigned int flow_type);
6a6de9ef TG	117	int (*set_wake)(unsigned int irq, unsigned int on);
c0ad90a3	118
b77d6adc PBG	119	/* Currently used only by UML, might disappear one day.*/
b77d6adc PBG	120	#ifdef CONFIG_IRQ_RELEASE_METHOD
71d218b7	121	void (release)(unsigned int irq, void dev_id);
b77d6adc	122	#endif
6a6de9ef TG	123	/*
	124	* For compatibility, ->typename is copied into ->name.
	125	* Will disappear.
	126	*/
	127	const char *typename;
1da177e4 LT	128	};
1da177e4 LT	129
3060d6fe	130	struct timer_rand_state;
e420dfb4	131	struct irq_2_iommu;
8fee5c36 IM	132	/**
	133	* struct irq_desc - interrupt descriptor
	134	*
6a6de9ef TG	135	* @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
6a6de9ef TG	136	* @chip: low level interrupt hardware access
472900b8	137	* @msi_desc: MSI descriptor
6a6de9ef TG	138	* @handler_data: per-IRQ data for the irq_chip methods
	139	* @chip_data: platform-specific per-chip private data for the chip
	140	* methods, to allow shared chip implementations
8fee5c36 IM	141	* @action: the irq action chain
	142	* @status: status information
	143	* @depth: disable-depth, for nested irq_disable() calls
15a647eb	144	* @wake_depth: enable depth, for multiple set_irq_wake() callers
8fee5c36 IM	145	* @irq_count: stats field to detect stalled irqs
8fee5c36 IM	146	* @irqs_unhandled: stats field for spurious unhandled interrupts
5ac4d823	147	* @last_unhandled: aging timer for unhandled count
8fee5c36 IM	148	* @lock: locking for SMP
8fee5c36 IM	149	* @affinity: IRQ affinity on SMP
6a6de9ef	150	* @cpu: cpu index useful for balancing
8fee5c36	151	* @pending_mask: pending rebalanced interrupts
8fee5c36 IM	152	* @dir: /proc/irq/ procfs entry
8fee5c36 IM	153	* @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP
a460e745	154	* @name: flow handler name for /proc/interrupts output
1da177e4	155	*/
34ffdb72	156	struct irq_desc {
08678b08 YL	157	unsigned int irq;
	158	#ifdef CONFIG_HAVE_SPARSE_IRQ
	159	struct irq_desc *next;
3060d6fe	160	struct timer_rand_state *timer_rand_state;
7f95ec9e YL	161	#endif
	162	#ifdef CONFIG_HAVE_DYN_ARRAY
	163	unsigned int *kstat_irqs;
	164	#else
	165	unsigned int kstat_irqs[NR_CPUS];
e420dfb4 YL	166	#endif
	167	#if defined(CONFIG_INTR_REMAP) && defined(CONFIG_HAVE_SPARSE_IRQ)
	168	struct irq_2_iommu *irq_2_iommu;
08678b08	169	#endif
57a58a94	170	irq_flow_handler_t handle_irq;
6a6de9ef	171	struct irq_chip *chip;
5b912c10	172	struct msi_desc *msi_desc;
6a6de9ef	173	void *handler_data;
71d218b7 IM	174	void *chip_data;
	175	struct irqaction action; / IRQ action list */
	176	unsigned int status; /* IRQ status */
6a6de9ef	177
71d218b7	178	unsigned int depth; /* nested irq disables */
15a647eb	179	unsigned int wake_depth; /* nested wake enables */
71d218b7 IM	180	unsigned int irq_count; /* For detecting broken IRQs */
71d218b7 IM	181	unsigned int irqs_unhandled;
4f27c00b	182	unsigned long last_unhandled; /* Aging timer for unhandled count */
71d218b7	183	spinlock_t lock;
a53da52f	184	#ifdef CONFIG_SMP
71d218b7	185	cpumask_t affinity;
6a6de9ef	186	unsigned int cpu;
a53da52f	187	#endif
8b8e8c1b	188	#ifdef CONFIG_GENERIC_PENDING_IRQ
cd916d31	189	cpumask_t pending_mask;
54d5d424	190	#endif
4a733ee1	191	#ifdef CONFIG_PROC_FS
a460e745	192	struct proc_dir_entry *dir;
4a733ee1	193	#endif
a460e745	194	const char *name;
e729aa16	195	} ____cacheline_internodealigned_in_smp;
1da177e4	196
08678b08	197	extern struct irq_desc *irq_to_desc(unsigned int irq);
cb5bc832	198	extern struct irq_desc *irq_to_desc_alloc(unsigned int irq);
9059d8fa YL	199
	200	#ifndef CONFIG_HAVE_SPARSE_IRQ
	201
08678b08 YL	202	#ifndef CONFIG_HAVE_DYN_ARRAY
08678b08 YL	203	/* could be removed if we get rid of all irq_desc reference */
34ffdb72	204	extern struct irq_desc irq_desc[NR_IRQS];
9059d8fa YL	205	#else
9059d8fa YL	206	extern struct irq_desc *irq_desc;
d60458b2	207	#endif
9059d8fa	208
2c6927a3 YL	209	#ifdef CONFIG_GENERIC_HARDIRQS
	210	#define for_each_irq_desc(irq, desc) \
	211	for (irq = 0, desc = irq_desc; irq < nr_irqs; irq++, desc = &irq_desc[irq])
	212	#endif
	213
9059d8fa YL	214	#else
	215
	216	extern struct irq_desc *sparse_irqs;
2c6927a3	217	#define for_each_irq_desc(irqX, desc) \
67fb283e	218	for (desc = sparse_irqs, irqX = desc->irq; desc; desc = desc->next, irqX = desc ? desc->irq : -1U)
9059d8fa YL	219
	220	#endif
	221
7f95ec9e YL	222	#define kstat_irqs_this_cpu(DESC) \
7f95ec9e YL	223	((DESC)->kstat_irqs[smp_processor_id()])
1da177e4	224
34ffdb72 IM	225	/*
	226	* Migration helpers for obsolete names, they will go away:
	227	*/
6a6de9ef TG	228	#define hw_interrupt_type irq_chip
	229	typedef struct irq_chip hw_irq_controller;
	230	#define no_irq_type no_irq_chip
34ffdb72 IM	231	typedef struct irq_desc irq_desc_t;
	232
	233	/*
	234	* Pick up the arch-dependent methods:
	235	*/
	236	#include <asm/hw_irq.h>
1da177e4	237
06fcb0c6	238	extern int setup_irq(unsigned int irq, struct irqaction *new);
1da177e4 LT	239
1da177e4 LT	240	#ifdef CONFIG_GENERIC_HARDIRQS
06fcb0c6	241
54d5d424 AR	242	#ifdef CONFIG_SMP
54d5d424 AR	243
8b8e8c1b	244	#ifdef CONFIG_GENERIC_PENDING_IRQ
54d5d424	245
c777ac55 AM	246	void set_pending_irq(unsigned int irq, cpumask_t mask);
c777ac55 AM	247	void move_native_irq(int irq);
e7b946e9	248	void move_masked_irq(int irq);
54d5d424	249
8b8e8c1b	250	#else /* CONFIG_GENERIC_PENDING_IRQ */
06fcb0c6 IM	251
	252	static inline void move_irq(int irq)
	253	{
	254	}
	255
	256	static inline void move_native_irq(int irq)
	257	{
	258	}
	259
e7b946e9 EB	260	static inline void move_masked_irq(int irq)
	261	{
	262	}
	263
06fcb0c6 IM	264	static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
	265	{
	266	}
54d5d424	267
06fcb0c6	268	#endif /* CONFIG_GENERIC_PENDING_IRQ */
54d5d424	269
06fcb0c6	270	#else /* CONFIG_SMP */
54d5d424	271
54d5d424	272	#define move_native_irq(x)
e7b946e9	273	#define move_masked_irq(x)
54d5d424	274
06fcb0c6	275	#endif /* CONFIG_SMP */
54d5d424	276
1da177e4	277	extern int no_irq_affinity;
1da177e4	278
950f4427 TG	279	static inline int irq_balancing_disabled(unsigned int irq)
950f4427 TG	280	{
08678b08 YL	281	struct irq_desc *desc;
	282
	283	desc = irq_to_desc(irq);
	284	return desc->status & IRQ_NO_BALANCING_MASK;
950f4427 TG	285	}
950f4427 TG	286
6a6de9ef	287	/* Handle irq action chains: */
7d12e780	288	extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);
6a6de9ef TG	289
	290	/*
	291	* Built-in IRQ handlers for various IRQ types,
	292	* callable via desc->chip->handle_irq()
	293	*/
ec701584 HH	294	extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
	295	extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
	296	extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
	297	extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
	298	extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
	299	extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
6a6de9ef	300
2e60bbb6	301	/*
6a6de9ef	302	* Monolithic do_IRQ implementation.
2e60bbb6	303	*/
af8c65b5	304	#ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
ec701584	305	extern unsigned int __do_IRQ(unsigned int irq);
af8c65b5	306	#endif
2e60bbb6	307
dae86204 IM	308	/*
	309	* Architectures call this to let the generic IRQ layer
	310	* handle an interrupt. If the descriptor is attached to an
	311	* irqchip-style controller then we call the ->handle_irq() handler,
	312	* and it calls __do_IRQ() if it's attached to an irqtype-style controller.
	313	*/
46926b67	314	static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
dae86204	315	{
af8c65b5	316	#ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
7d12e780	317	desc->handle_irq(irq, desc);
af8c65b5	318	#else
dae86204	319	if (likely(desc->handle_irq))
7d12e780	320	desc->handle_irq(irq, desc);
dae86204	321	else
7d12e780	322	__do_IRQ(irq);
af8c65b5	323	#endif
dae86204 IM	324	}
dae86204 IM	325
46926b67 YL	326	static inline void generic_handle_irq(unsigned int irq)
	327	{
	328	generic_handle_irq_desc(irq, irq_to_desc(irq));
	329	}
	330
6a6de9ef	331	/* Handling of unhandled and spurious interrupts: */
34ffdb72	332	extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
7d12e780	333	int action_ret);
1da177e4	334
a4633adc TG	335	/* Resending of interrupts :*/
	336	void check_irq_resend(struct irq_desc *desc, unsigned int irq);
	337
6a6de9ef TG	338	/* Enable/disable irq debugging output: */
	339	extern int noirqdebug_setup(char *str);
	340
	341	/* Checks whether the interrupt can be requested by request_irq(): */
	342	extern int can_request_irq(unsigned int irq, unsigned long irqflags);
	343
f8b5473f	344	/* Dummy irq-chip implementations: */
6a6de9ef	345	extern struct irq_chip no_irq_chip;
f8b5473f	346	extern struct irq_chip dummy_irq_chip;
6a6de9ef	347
145fc655 IM	348	extern void
	349	set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
	350	irq_flow_handler_t handle);
6a6de9ef	351	extern void
a460e745 IM	352	set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
	353	irq_flow_handler_t handle, const char *name);
	354
6a6de9ef	355	extern void
a460e745 IM	356	__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
a460e745 IM	357	const char *name);
1da177e4	358
b019e573 KH	359	/* caller has locked the irq_desc and both params are valid */
	360	static inline void __set_irq_handler_unlocked(int irq,
	361	irq_flow_handler_t handler)
	362	{
08678b08 YL	363	struct irq_desc *desc;
	364
	365	desc = irq_to_desc(irq);
	366	desc->handle_irq = handler;
b019e573 KH	367	}
b019e573 KH	368
6a6de9ef TG	369	/*
	370	* Set a highlevel flow handler for a given IRQ:
	371	*/
	372	static inline void
57a58a94	373	set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
6a6de9ef	374	{
a460e745	375	__set_irq_handler(irq, handle, 0, NULL);
6a6de9ef TG	376	}
	377
	378	/*
	379	* Set a highlevel chained flow handler for a given IRQ.
	380	* (a chained handler is automatically enabled and set to
	381	* IRQ_NOREQUEST and IRQ_NOPROBE)
	382	*/
	383	static inline void
	384	set_irq_chained_handler(unsigned int irq,
57a58a94	385	irq_flow_handler_t handle)
6a6de9ef	386	{
a460e745	387	__set_irq_handler(irq, handle, 1, NULL);
6a6de9ef TG	388	}
6a6de9ef TG	389
46f4f8f6 RB	390	extern void set_irq_noprobe(unsigned int irq);
	391	extern void set_irq_probe(unsigned int irq);
	392
3a16d713	393	/* Handle dynamic irq creation and destruction */
6d50bc26	394	extern unsigned int create_irq_nr(unsigned int irq_want);
3a16d713 EB	395	extern int create_irq(void);
	396	extern void destroy_irq(unsigned int irq);
	397
1f80025e EB	398	/* Test to see if a driver has successfully requested an irq */
	399	static inline int irq_has_action(unsigned int irq)
	400	{
08678b08	401	struct irq_desc *desc = irq_to_desc(irq);
1f80025e EB	402	return desc->action != NULL;
	403	}
	404
3a16d713 EB	405	/* Dynamic irq helper functions */
	406	extern void dynamic_irq_init(unsigned int irq);
	407	extern void dynamic_irq_cleanup(unsigned int irq);
dd87eb3a	408
3a16d713	409	/* Set/get chip/data for an IRQ: */
dd87eb3a TG	410	extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
	411	extern int set_irq_data(unsigned int irq, void *data);
	412	extern int set_irq_chip_data(unsigned int irq, void *data);
	413	extern int set_irq_type(unsigned int irq, unsigned int type);
5b912c10	414	extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
dd87eb3a	415
08678b08 YL	416	#define get_irq_chip(irq) (irq_to_desc(irq)->chip)
	417	#define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data)
	418	#define get_irq_data(irq) (irq_to_desc(irq)->handler_data)
	419	#define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc)
dd87eb3a	420
6a6de9ef	421	#endif /* CONFIG_GENERIC_HARDIRQS */
1da177e4	422
06fcb0c6	423	#endif /* !CONFIG_S390 */
1da177e4	424
06fcb0c6	425	#endif /* _LINUX_IRQ_H */