[linux-block.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/gfp.h>
#include <linux/irqreturn.h>
#include <linux/irqnr.h>
#include <linux/errno.h>
#include <linux/topology.h>
#include <linux/wait.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 */
#define IRQ_AFFINITY_SET	0x02000000	/* IRQ affinity was set from userspace*/
#define IRQ_SUSPENDED		0x04000000	/* IRQ has gone through suspend sequence */
#define IRQ_ONESHOT		0x08000000	/* IRQ is not unmasked after hardirq */
#define IRQ_NESTED_THREAD	0x10000000	/* IRQ is nested into another, no own handler thread */

#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
 * @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
 *
 * @bus_lock:		function to lock access to slow bus (i2c) chips
 * @bus_sync_unlock:	function to sync and unlock slow bus (i2c) chips
 *
 * @release:		release function solely used by UML
 */
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);
	int		(*set_affinity)(unsigned int irq,
					const struct cpumask *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);

	void		(*bus_lock)(unsigned int irq);
	void		(*bus_sync_unlock)(unsigned int irq);

	/* Currently used only by UML, might disappear one day.*/
#ifdef CONFIG_IRQ_RELEASE_METHOD
	void		(*release)(unsigned int irq, void *dev_id);
#endif
};

struct timer_rand_state;
struct irq_2_iommu;
/**
 * struct irq_desc - interrupt descriptor
 * @irq:		interrupt number for this descriptor
 * @timer_rand_state:	pointer to timer rand state struct
 * @kstat_irqs:		irq stats per cpu
 * @irq_2_iommu:	iommu with this irq
 * @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
 * @last_unhandled:	aging timer for unhandled count
 * @irqs_unhandled:	stats field for spurious unhandled interrupts
 * @lock:		locking for SMP
 * @affinity:		IRQ affinity on SMP
 * @node:		node index useful for balancing
 * @pending_mask:	pending rebalanced interrupts
 * @threads_active:	number of irqaction threads currently running
 * @wait_for_threads:	wait queue for sync_irq to wait for threaded handlers
 * @dir:		/proc/irq/ procfs entry
 * @name:		flow handler name for /proc/interrupts output
 */
struct irq_desc {
	unsigned int		irq;
	struct timer_rand_state *timer_rand_state;
	unsigned int            *kstat_irqs;
#ifdef CONFIG_INTR_REMAP
	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 long		last_unhandled;	/* Aging timer for unhandled count */
	unsigned int		irqs_unhandled;
	raw_spinlock_t		lock;
#ifdef CONFIG_SMP
	cpumask_var_t		affinity;
	const struct cpumask	*affinity_hint;
	unsigned int		node;
#ifdef CONFIG_GENERIC_PENDING_IRQ
	cpumask_var_t		pending_mask;
#endif
#endif
	atomic_t		threads_active;
	wait_queue_head_t       wait_for_threads;
#ifdef CONFIG_PROC_FS
	struct proc_dir_entry	*dir;
#endif
	const char		*name;
} ____cacheline_internodealigned_in_smp;

extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
					struct irq_desc *desc, int node);
extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);

#ifndef CONFIG_SPARSE_IRQ
extern struct irq_desc irq_desc[NR_IRQS];
#endif

#ifdef CONFIG_NUMA_IRQ_DESC
extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node);
#else
static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
{
	return desc;
}
#endif

extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);

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

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

#ifdef CONFIG_GENERIC_HARDIRQS

#ifdef CONFIG_SMP

#ifdef CONFIG_GENERIC_PENDING_IRQ

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)
{
}

#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 irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action);

/*
 * Built-in IRQ handlers for various IRQ types,
 * callable via desc->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);
extern void handle_nested_irq(unsigned int irq);

/*
 * 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,
			   irqreturn_t 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_nested_thread(unsigned int irq, int nest);

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, int node);
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);
void dynamic_irq_init_keep_chip_data(unsigned int irq);
extern void dynamic_irq_cleanup(unsigned int irq);
void dynamic_irq_cleanup_keep_chip_data(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)

#define get_irq_desc_chip(desc)		((desc)->chip)
#define get_irq_desc_chip_data(desc)	((desc)->chip_data)
#define get_irq_desc_data(desc)		((desc)->handler_data)
#define get_irq_desc_msi(desc)		((desc)->msi_desc)

#endif /* CONFIG_GENERIC_HARDIRQS */

#endif /* !CONFIG_S390 */

#ifdef CONFIG_SMP
/**
 * alloc_desc_masks - allocate cpumasks for irq_desc
 * @desc:	pointer to irq_desc struct
 * @node:	node which will be handling the cpumasks
 * @boot:	true if need bootmem
 *
 * Allocates affinity and pending_mask cpumask if required.
 * Returns true if successful (or not required).
 */
static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
							bool boot)
{
	gfp_t gfp = GFP_ATOMIC;

	if (boot)
		gfp = GFP_NOWAIT;

#ifdef CONFIG_CPUMASK_OFFSTACK
	if (!alloc_cpumask_var_node(&desc->affinity, gfp, node))
		return false;

#ifdef CONFIG_GENERIC_PENDING_IRQ
	if (!alloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
		free_cpumask_var(desc->affinity);
		return false;
	}
#endif
#endif
	return true;
}

static inline void init_desc_masks(struct irq_desc *desc)
{
	cpumask_setall(desc->affinity);
#ifdef CONFIG_GENERIC_PENDING_IRQ
	cpumask_clear(desc->pending_mask);
#endif
}

/**
 * init_copy_desc_masks - copy cpumasks for irq_desc
 * @old_desc:	pointer to old irq_desc struct
 * @new_desc:	pointer to new irq_desc struct
 *
 * Insures affinity and pending_masks are copied to new irq_desc.
 * If !CONFIG_CPUMASKS_OFFSTACK the cpumasks are embedded in the
 * irq_desc struct so the copy is redundant.
 */

static inline void init_copy_desc_masks(struct irq_desc *old_desc,
					struct irq_desc *new_desc)
{
#ifdef CONFIG_CPUMASK_OFFSTACK
	cpumask_copy(new_desc->affinity, old_desc->affinity);

#ifdef CONFIG_GENERIC_PENDING_IRQ
	cpumask_copy(new_desc->pending_mask, old_desc->pending_mask);
#endif
#endif
}

static inline void free_desc_masks(struct irq_desc *old_desc,
				   struct irq_desc *new_desc)
{
	free_cpumask_var(old_desc->affinity);

#ifdef CONFIG_GENERIC_PENDING_IRQ
	free_cpumask_var(old_desc->pending_mask);
#endif
}

#else /* !CONFIG_SMP */

static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
								bool boot)
{
	return true;
}

static inline void init_desc_masks(struct irq_desc *desc)
{
}

static inline void init_copy_desc_masks(struct irq_desc *old_desc,
					struct irq_desc *new_desc)
{
}

static inline void free_desc_masks(struct irq_desc *old_desc,
				   struct irq_desc *new_desc)
{
}
#endif	/* CONFIG_SMP */

#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>
503e5763	20	#include <linux/gfp.h>
908dcecd	21	#include <linux/irqreturn.h>
dd3a1db9	22	#include <linux/irqnr.h>
77904fd6	23	#include <linux/errno.h>
503e5763	24	#include <linux/topology.h>
3aa551c9	25	#include <linux/wait.h>
1da177e4 LT	26
	27	#include <asm/irq.h>
	28	#include <asm/ptrace.h>
7d12e780	29	#include <asm/irq_regs.h>
1da177e4	30
57a58a94	31	struct irq_desc;
ec701584	32	typedef void (*irq_flow_handler_t)(unsigned int irq,
7d12e780	33	struct irq_desc *desc);
57a58a94 DH	34
57a58a94 DH	35
1da177e4 LT	36	/*
1da177e4 LT	37	* IRQ line status.
6e213616	38	*
950f4427	39	* Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
6e213616 TG	40	*
6e213616 TG	41	* IRQ types
1da177e4	42	*/
6e213616 TG	43	#define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */
	44	#define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */
	45	#define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */
	46	#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING \| IRQ_TYPE_EDGE_RISING)
	47	#define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */
	48	#define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */
	49	#define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */
	50	#define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */
	51
	52	/* Internal flags */
950f4427 TG	53	#define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */
	54	#define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */
	55	#define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */
	56	#define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */
	57	#define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */
	58	#define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */
	59	#define IRQ_LEVEL 0x00004000 /* IRQ level triggered */
	60	#define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */
	61	#define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */
	62	#define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */
	63	#define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */
	64	#define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */
d7e25f33 IM	65	#define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */
	66	#define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */
	67	#define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */
1adb0850	68	#define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */
f6d87f4b TG	69	#define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */
f6d87f4b TG	70	#define IRQ_AFFINITY_SET 0x02000000 /* IRQ affinity was set from userspace*/
0a0c5168	71	#define IRQ_SUSPENDED 0x04000000 /* IRQ has gone through suspend sequence */
b25c340c	72	#define IRQ_ONESHOT 0x08000000 /* IRQ is not unmasked after hardirq */
399b5da2	73	#define IRQ_NESTED_THREAD 0x10000000 /* IRQ is nested into another, no own handler thread */
950f4427	74
0d7012a9	75	#ifdef CONFIG_IRQ_PER_CPU
f26fdd59	76	# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
950f4427	77	# define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU \| IRQ_NO_BALANCING)
f26fdd59 KW	78	#else
f26fdd59 KW	79	# define CHECK_IRQ_PER_CPU(var) 0
950f4427	80	# define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
f26fdd59	81	#endif
1da177e4	82
6a6de9ef	83	struct proc_dir_entry;
5b912c10	84	struct msi_desc;
6a6de9ef	85
8fee5c36	86	/**
6a6de9ef	87	* struct irq_chip - hardware interrupt chip descriptor
8fee5c36 IM	88	*
	89	* @name: name for /proc/interrupts
	90	* @startup: start up the interrupt (defaults to ->enable if NULL)
	91	* @shutdown: shut down the interrupt (defaults to ->disable if NULL)
	92	* @enable: enable the interrupt (defaults to chip->unmask if NULL)
599faa0e	93	* @disable: disable the interrupt
8fee5c36 IM	94	* @ack: start of a new interrupt
	95	* @mask: mask an interrupt source
	96	* @mask_ack: ack and mask an interrupt source
	97	* @unmask: unmask an interrupt source
47c2a3aa IM	98	* @eoi: end of interrupt - chip level
47c2a3aa IM	99	* @end: end of interrupt - flow level
8fee5c36 IM	100	* @set_affinity: set the CPU affinity on SMP machines
	101	* @retrigger: resend an IRQ to the CPU
	102	* @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
	103	* @set_wake: enable/disable power-management wake-on of an IRQ
	104	*
70aedd24 TG	105	* @bus_lock: function to lock access to slow bus (i2c) chips
	106	* @bus_sync_unlock: function to sync and unlock slow bus (i2c) chips
	107	*
8fee5c36	108	* @release: release function solely used by UML
1da177e4	109	*/
6a6de9ef TG	110	struct irq_chip {
6a6de9ef TG	111	const char *name;
71d218b7 IM	112	unsigned int (*startup)(unsigned int irq);
	113	void (*shutdown)(unsigned int irq);
	114	void (*enable)(unsigned int irq);
	115	void (*disable)(unsigned int irq);
6a6de9ef	116
71d218b7	117	void (*ack)(unsigned int irq);
6a6de9ef TG	118	void (*mask)(unsigned int irq);
	119	void (*mask_ack)(unsigned int irq);
	120	void (*unmask)(unsigned int irq);
47c2a3aa	121	void (*eoi)(unsigned int irq);
6a6de9ef	122
71d218b7	123	void (*end)(unsigned int irq);
d5dedd45	124	int (*set_affinity)(unsigned int irq,
0de26520	125	const struct cpumask *dest);
c0ad90a3	126	int (*retrigger)(unsigned int irq);
6a6de9ef TG	127	int (*set_type)(unsigned int irq, unsigned int flow_type);
6a6de9ef TG	128	int (*set_wake)(unsigned int irq, unsigned int on);
c0ad90a3	129
70aedd24 TG	130	void (*bus_lock)(unsigned int irq);
	131	void (*bus_sync_unlock)(unsigned int irq);
	132
b77d6adc PBG	133	/* Currently used only by UML, might disappear one day.*/
b77d6adc PBG	134	#ifdef CONFIG_IRQ_RELEASE_METHOD
71d218b7	135	void (release)(unsigned int irq, void dev_id);
b77d6adc	136	#endif
1da177e4 LT	137	};
1da177e4 LT	138
0b8f1efa YL	139	struct timer_rand_state;
0b8f1efa YL	140	struct irq_2_iommu;
8fee5c36 IM	141	/**
8fee5c36 IM	142	* struct irq_desc - interrupt descriptor
2ed1cdcf	143	* @irq: interrupt number for this descriptor
078a55db YL	144	* @timer_rand_state: pointer to timer rand state struct
	145	* @kstat_irqs: irq stats per cpu
	146	* @irq_2_iommu: iommu with this irq
6a6de9ef TG	147	* @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
6a6de9ef TG	148	* @chip: low level interrupt hardware access
472900b8	149	* @msi_desc: MSI descriptor
6a6de9ef TG	150	* @handler_data: per-IRQ data for the irq_chip methods
	151	* @chip_data: platform-specific per-chip private data for the chip
	152	* methods, to allow shared chip implementations
8fee5c36 IM	153	* @action: the irq action chain
	154	* @status: status information
	155	* @depth: disable-depth, for nested irq_disable() calls
15a647eb	156	* @wake_depth: enable depth, for multiple set_irq_wake() callers
8fee5c36	157	* @irq_count: stats field to detect stalled irqs
5ac4d823	158	* @last_unhandled: aging timer for unhandled count
e262a7ba	159	* @irqs_unhandled: stats field for spurious unhandled interrupts
8fee5c36 IM	160	* @lock: locking for SMP
8fee5c36 IM	161	* @affinity: IRQ affinity on SMP
ab33dcff	162	* @node: node index useful for balancing
8fee5c36	163	* @pending_mask: pending rebalanced interrupts
3aa551c9 TG	164	* @threads_active: number of irqaction threads currently running
3aa551c9 TG	165	* @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
8fee5c36	166	* @dir: /proc/irq/ procfs entry
a460e745	167	* @name: flow handler name for /proc/interrupts output
1da177e4	168	*/
34ffdb72	169	struct irq_desc {
08678b08	170	unsigned int irq;
0b8f1efa YL	171	struct timer_rand_state *timer_rand_state;
0b8f1efa YL	172	unsigned int *kstat_irqs;
d7e51e66	173	#ifdef CONFIG_INTR_REMAP
0b8f1efa	174	struct irq_2_iommu *irq_2_iommu;
0b8f1efa	175	#endif
57a58a94	176	irq_flow_handler_t handle_irq;
6a6de9ef	177	struct irq_chip *chip;
5b912c10	178	struct msi_desc *msi_desc;
6a6de9ef	179	void *handler_data;
71d218b7 IM	180	void *chip_data;
	181	struct irqaction action; / IRQ action list */
	182	unsigned int status; /* IRQ status */
6a6de9ef	183
71d218b7	184	unsigned int depth; /* nested irq disables */
15a647eb	185	unsigned int wake_depth; /* nested wake enables */
71d218b7	186	unsigned int irq_count; /* For detecting broken IRQs */
4f27c00b	187	unsigned long last_unhandled; /* Aging timer for unhandled count */
e262a7ba	188	unsigned int irqs_unhandled;
239007b8	189	raw_spinlock_t lock;
a53da52f	190	#ifdef CONFIG_SMP
7f7ace0c	191	cpumask_var_t affinity;
e7a297b0	192	const struct cpumask *affinity_hint;
85ac16d0	193	unsigned int node;
8b8e8c1b	194	#ifdef CONFIG_GENERIC_PENDING_IRQ
7f7ace0c MT	195	cpumask_var_t pending_mask;
7f7ace0c MT	196	#endif
54d5d424	197	#endif
3aa551c9 TG	198	atomic_t threads_active;
3aa551c9 TG	199	wait_queue_head_t wait_for_threads;
4a733ee1	200	#ifdef CONFIG_PROC_FS
a460e745	201	struct proc_dir_entry *dir;
4a733ee1	202	#endif
a460e745	203	const char *name;
e729aa16	204	} ____cacheline_internodealigned_in_smp;
1da177e4	205
0b8f1efa	206	extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
85ac16d0	207	struct irq_desc *desc, int node);
0b8f1efa	208	extern void arch_free_chip_data(struct irq_desc old_desc, struct irq_desc desc);
9059d8fa	209
0b8f1efa	210	#ifndef CONFIG_SPARSE_IRQ
34ffdb72	211	extern struct irq_desc irq_desc[NR_IRQS];
15e957d0 YL	212	#endif
	213
	214	#ifdef CONFIG_NUMA_IRQ_DESC
85ac16d0	215	extern struct irq_desc move_irq_desc(struct irq_desc old_desc, int node);
15e957d0 YL	216	#else
	217	static inline struct irq_desc move_irq_desc(struct irq_desc desc, int node)
	218	{
	219	return desc;
	220	}
	221	#endif
0b8f1efa	222
85ac16d0	223	extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
0b8f1efa	224
34ffdb72 IM	225	/*
	226	* Pick up the arch-dependent methods:
	227	*/
	228	#include <asm/hw_irq.h>
1da177e4	229
06fcb0c6	230	extern int setup_irq(unsigned int irq, struct irqaction *new);
cbf94f06	231	extern void remove_irq(unsigned int irq, struct irqaction *act);
1da177e4 LT	232
1da177e4 LT	233	#ifdef CONFIG_GENERIC_HARDIRQS
06fcb0c6	234
54d5d424 AR	235	#ifdef CONFIG_SMP
54d5d424 AR	236
8b8e8c1b	237	#ifdef CONFIG_GENERIC_PENDING_IRQ
54d5d424	238
c777ac55	239	void move_native_irq(int irq);
e7b946e9	240	void move_masked_irq(int irq);
54d5d424	241
8b8e8c1b	242	#else /* CONFIG_GENERIC_PENDING_IRQ */
06fcb0c6 IM	243
	244	static inline void move_irq(int irq)
	245	{
	246	}
	247
	248	static inline void move_native_irq(int irq)
	249	{
	250	}
	251
e7b946e9 EB	252	static inline void move_masked_irq(int irq)
	253	{
	254	}
	255
06fcb0c6	256	#endif /* CONFIG_GENERIC_PENDING_IRQ */
54d5d424	257
06fcb0c6	258	#else /* CONFIG_SMP */
54d5d424	259
54d5d424	260	#define move_native_irq(x)
e7b946e9	261	#define move_masked_irq(x)
54d5d424	262
06fcb0c6	263	#endif /* CONFIG_SMP */
54d5d424	264
1da177e4	265	extern int no_irq_affinity;
1da177e4	266
950f4427 TG	267	static inline int irq_balancing_disabled(unsigned int irq)
950f4427 TG	268	{
08678b08 YL	269	struct irq_desc *desc;
	270
	271	desc = irq_to_desc(irq);
	272	return desc->status & IRQ_NO_BALANCING_MASK;
950f4427 TG	273	}
950f4427 TG	274
6a6de9ef	275	/* Handle irq action chains: */
bedd30d9	276	extern irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action);
6a6de9ef TG	277
	278	/*
	279	* Built-in IRQ handlers for various IRQ types,
bebd04cc	280	* callable via desc->handle_irq()
6a6de9ef	281	*/
ec701584 HH	282	extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
	283	extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
	284	extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
	285	extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
	286	extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
	287	extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
31b47cf7	288	extern void handle_nested_irq(unsigned int irq);
6a6de9ef	289
2e60bbb6	290	/*
6a6de9ef	291	* Monolithic do_IRQ implementation.
2e60bbb6	292	*/
af8c65b5	293	#ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
ec701584	294	extern unsigned int __do_IRQ(unsigned int irq);
af8c65b5	295	#endif
2e60bbb6	296
dae86204 IM	297	/*
	298	* Architectures call this to let the generic IRQ layer
	299	* handle an interrupt. If the descriptor is attached to an
	300	* irqchip-style controller then we call the ->handle_irq() handler,
	301	* and it calls __do_IRQ() if it's attached to an irqtype-style controller.
	302	*/
46926b67	303	static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
dae86204	304	{
af8c65b5	305	#ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
7d12e780	306	desc->handle_irq(irq, desc);
af8c65b5	307	#else
dae86204	308	if (likely(desc->handle_irq))
7d12e780	309	desc->handle_irq(irq, desc);
dae86204	310	else
7d12e780	311	__do_IRQ(irq);
af8c65b5	312	#endif
dae86204 IM	313	}
dae86204 IM	314
46926b67 YL	315	static inline void generic_handle_irq(unsigned int irq)
	316	{
	317	generic_handle_irq_desc(irq, irq_to_desc(irq));
	318	}
	319
6a6de9ef	320	/* Handling of unhandled and spurious interrupts: */
34ffdb72	321	extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
bedd30d9	322	irqreturn_t action_ret);
1da177e4	323
a4633adc TG	324	/* Resending of interrupts :*/
	325	void check_irq_resend(struct irq_desc *desc, unsigned int irq);
	326
6a6de9ef TG	327	/* Enable/disable irq debugging output: */
	328	extern int noirqdebug_setup(char *str);
	329
	330	/* Checks whether the interrupt can be requested by request_irq(): */
	331	extern int can_request_irq(unsigned int irq, unsigned long irqflags);
	332
f8b5473f	333	/* Dummy irq-chip implementations: */
6a6de9ef	334	extern struct irq_chip no_irq_chip;
f8b5473f	335	extern struct irq_chip dummy_irq_chip;
6a6de9ef	336
145fc655 IM	337	extern void
	338	set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
	339	irq_flow_handler_t handle);
6a6de9ef	340	extern void
a460e745 IM	341	set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
	342	irq_flow_handler_t handle, const char *name);
	343
6a6de9ef	344	extern void
a460e745 IM	345	__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
a460e745 IM	346	const char *name);
1da177e4	347
b019e573 KH	348	/* caller has locked the irq_desc and both params are valid */
	349	static inline void __set_irq_handler_unlocked(int irq,
	350	irq_flow_handler_t handler)
	351	{
08678b08 YL	352	struct irq_desc *desc;
	353
	354	desc = irq_to_desc(irq);
	355	desc->handle_irq = handler;
b019e573 KH	356	}
b019e573 KH	357
6a6de9ef TG	358	/*
	359	* Set a highlevel flow handler for a given IRQ:
	360	*/
	361	static inline void
57a58a94	362	set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
6a6de9ef	363	{
a460e745	364	__set_irq_handler(irq, handle, 0, NULL);
6a6de9ef TG	365	}
	366
	367	/*
	368	* Set a highlevel chained flow handler for a given IRQ.
	369	* (a chained handler is automatically enabled and set to
	370	* IRQ_NOREQUEST and IRQ_NOPROBE)
	371	*/
	372	static inline void
	373	set_irq_chained_handler(unsigned int irq,
57a58a94	374	irq_flow_handler_t handle)
6a6de9ef	375	{
a460e745	376	__set_irq_handler(irq, handle, 1, NULL);
6a6de9ef TG	377	}
6a6de9ef TG	378
399b5da2 TG	379	extern void set_irq_nested_thread(unsigned int irq, int nest);
399b5da2 TG	380
46f4f8f6 RB	381	extern void set_irq_noprobe(unsigned int irq);
	382	extern void set_irq_probe(unsigned int irq);
	383
3a16d713	384	/* Handle dynamic irq creation and destruction */
d047f53a	385	extern unsigned int create_irq_nr(unsigned int irq_want, int node);
3a16d713 EB	386	extern int create_irq(void);
	387	extern void destroy_irq(unsigned int irq);
	388
1f80025e EB	389	/* Test to see if a driver has successfully requested an irq */
	390	static inline int irq_has_action(unsigned int irq)
	391	{
08678b08	392	struct irq_desc *desc = irq_to_desc(irq);
1f80025e EB	393	return desc->action != NULL;
	394	}
	395
3a16d713 EB	396	/* Dynamic irq helper functions */
3a16d713 EB	397	extern void dynamic_irq_init(unsigned int irq);
ced5b697	398	void dynamic_irq_init_keep_chip_data(unsigned int irq);
3a16d713	399	extern void dynamic_irq_cleanup(unsigned int irq);
ced5b697	400	void dynamic_irq_cleanup_keep_chip_data(unsigned int irq);
dd87eb3a	401
3a16d713	402	/* Set/get chip/data for an IRQ: */
dd87eb3a TG	403	extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
	404	extern int set_irq_data(unsigned int irq, void *data);
	405	extern int set_irq_chip_data(unsigned int irq, void *data);
	406	extern int set_irq_type(unsigned int irq, unsigned int type);
5b912c10	407	extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
dd87eb3a	408
08678b08 YL	409	#define get_irq_chip(irq) (irq_to_desc(irq)->chip)
	410	#define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data)
	411	#define get_irq_data(irq) (irq_to_desc(irq)->handler_data)
	412	#define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc)
dd87eb3a	413
0b8f1efa YL	414	#define get_irq_desc_chip(desc) ((desc)->chip)
	415	#define get_irq_desc_chip_data(desc) ((desc)->chip_data)
	416	#define get_irq_desc_data(desc) ((desc)->handler_data)
	417	#define get_irq_desc_msi(desc) ((desc)->msi_desc)
	418
6a6de9ef	419	#endif /* CONFIG_GENERIC_HARDIRQS */
1da177e4	420
06fcb0c6	421	#endif /* !CONFIG_S390 */
1da177e4	422
7f7ace0c MT	423	#ifdef CONFIG_SMP
7f7ace0c MT	424	/**
9ec4fa27	425	* alloc_desc_masks - allocate cpumasks for irq_desc
7f7ace0c	426	* @desc: pointer to irq_desc struct
ab33dcff	427	* @node: node which will be handling the cpumasks
7f7ace0c MT	428	* @boot: true if need bootmem
	429	*
	430	* Allocates affinity and pending_mask cpumask if required.
	431	* Returns true if successful (or not required).
7f7ace0c	432	*/
85ac16d0	433	static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
38c7fed2	434	bool boot)
7f7ace0c	435	{
38c7fed2	436	gfp_t gfp = GFP_ATOMIC;
7f7ace0c	437
38c7fed2 YL	438	if (boot)
38c7fed2 YL	439	gfp = GFP_NOWAIT;
7f7ace0c	440
38c7fed2 YL	441	#ifdef CONFIG_CPUMASK_OFFSTACK
38c7fed2 YL	442	if (!alloc_cpumask_var_node(&desc->affinity, gfp, node))
7f7ace0c	443	return false;
7f7ace0c MT	444
7f7ace0c MT	445	#ifdef CONFIG_GENERIC_PENDING_IRQ
38c7fed2	446	if (!alloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
7f7ace0c MT	447	free_cpumask_var(desc->affinity);
	448	return false;
	449	}
9ec4fa27	450	#endif
7f7ace0c MT	451	#endif
	452	return true;
	453	}
	454
9ec4fa27 YL	455	static inline void init_desc_masks(struct irq_desc *desc)
	456	{
	457	cpumask_setall(desc->affinity);
	458	#ifdef CONFIG_GENERIC_PENDING_IRQ
	459	cpumask_clear(desc->pending_mask);
	460	#endif
	461	}
	462
7f7ace0c MT	463	/**
	464	* init_copy_desc_masks - copy cpumasks for irq_desc
	465	* @old_desc: pointer to old irq_desc struct
	466	* @new_desc: pointer to new irq_desc struct
	467	*
	468	* Insures affinity and pending_masks are copied to new irq_desc.
	469	* If !CONFIG_CPUMASKS_OFFSTACK the cpumasks are embedded in the
	470	* irq_desc struct so the copy is redundant.
	471	*/
	472
	473	static inline void init_copy_desc_masks(struct irq_desc *old_desc,
	474	struct irq_desc *new_desc)
	475	{
9ec4fa27	476	#ifdef CONFIG_CPUMASK_OFFSTACK
7f7ace0c MT	477	cpumask_copy(new_desc->affinity, old_desc->affinity);
	478
	479	#ifdef CONFIG_GENERIC_PENDING_IRQ
	480	cpumask_copy(new_desc->pending_mask, old_desc->pending_mask);
	481	#endif
	482	#endif
	483	}
	484
9756b15e YL	485	static inline void free_desc_masks(struct irq_desc *old_desc,
	486	struct irq_desc *new_desc)
	487	{
	488	free_cpumask_var(old_desc->affinity);
	489
	490	#ifdef CONFIG_GENERIC_PENDING_IRQ
	491	free_cpumask_var(old_desc->pending_mask);
	492	#endif
	493	}
	494
7f7ace0c MT	495	#else /* !CONFIG_SMP */
7f7ace0c MT	496
85ac16d0	497	static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
7f7ace0c MT	498	bool boot)
	499	{
	500	return true;
	501	}
	502
9ec4fa27 YL	503	static inline void init_desc_masks(struct irq_desc *desc)
	504	{
	505	}
	506
7f7ace0c MT	507	static inline void init_copy_desc_masks(struct irq_desc *old_desc,
	508	struct irq_desc *new_desc)
	509	{
	510	}
	511
9756b15e YL	512	static inline void free_desc_masks(struct irq_desc *old_desc,
	513	struct irq_desc *new_desc)
	514	{
	515	}
7f7ace0c MT	516	#endif /* CONFIG_SMP */
7f7ace0c MT	517
06fcb0c6	518	#endif /* _LINUX_IRQ_H */