1. 根目录:
2. kernel
3. irq
4. internals.h

/*
 * IRQ subsystem internal functions and variables:
 *
 * Do not ever include this file from anything else than
 * kernel/irq/. Do not even think about using any information outside
 * of this file for your non core code.
 */
#include <linux/irqdesc.h>
#include <linux/kernel_stat.h>

#ifdef CONFIG_SPARSE_IRQ
# define IRQ_BITMAP_BITS	(NR_IRQS + 8196)
#else
# define IRQ_BITMAP_BITS	NR_IRQS
#endif

#define istate core_internal_state__do_not_mess_with_it

extern bool noirqdebug;

extern struct irqaction chained_action;

/*
 * Bits used by threaded handlers:
 * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
 * IRQTF_WARNED    - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
 * IRQTF_AFFINITY  - irq thread is requested to adjust affinity
 * IRQTF_FORCED_THREAD  - irq action is force threaded
 */
enum {
	IRQTF_RUNTHREAD,
	IRQTF_WARNED,
	IRQTF_AFFINITY,
	IRQTF_FORCED_THREAD,
};

/*
 * Bit masks for desc->core_internal_state__do_not_mess_with_it
 *
 * IRQS_AUTODETECT		- autodetection in progress
 * IRQS_SPURIOUS_DISABLED	- was disabled due to spurious interrupt
 *				  detection
 * IRQS_POLL_INPROGRESS		- polling in progress
 * IRQS_ONESHOT			- irq is not unmasked in primary handler
 * IRQS_REPLAY			- irq is replayed
 * IRQS_WAITING			- irq is waiting
 * IRQS_PENDING			- irq is pending and replayed later
 * IRQS_SUSPENDED		- irq is suspended
 */
enum {
	IRQS_AUTODETECT		= 0x00000001,
	IRQS_SPURIOUS_DISABLED	= 0x00000002,
	IRQS_POLL_INPROGRESS	= 0x00000008,
	IRQS_ONESHOT		= 0x00000020,
	IRQS_REPLAY		= 0x00000040,
	IRQS_WAITING		= 0x00000080,
	IRQS_PENDING		= 0x00000200,
	IRQS_SUSPENDED		= 0x00000800,
};

#include "debug.h"
#include "settings.h"

extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
extern void __disable_irq(struct irq_desc *desc);
extern void __enable_irq(struct irq_desc *desc);

extern int irq_startup(struct irq_desc *desc, bool resend);
extern void irq_shutdown(struct irq_desc *desc);
extern void irq_enable(struct irq_desc *desc);
extern void irq_disable(struct irq_desc *desc);
extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
extern void mask_irq(struct irq_desc *desc);
extern void unmask_irq(struct irq_desc *desc);
extern void unmask_threaded_irq(struct irq_desc *desc);

#ifdef CONFIG_SPARSE_IRQ
static inline void irq_mark_irq(unsigned int irq) { }
#else
extern void irq_mark_irq(unsigned int irq);
#endif

extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);

irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
irqreturn_t handle_irq_event(struct irq_desc *desc);

/* Resending of interrupts :*/
void check_irq_resend(struct irq_desc *desc);
bool irq_wait_for_poll(struct irq_desc *desc);
void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);

#ifdef CONFIG_PROC_FS
extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
extern void register_handler_proc(unsigned int irq, struct irqaction *action);
extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
#else
static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
static inline void register_handler_proc(unsigned int irq,
					 struct irqaction *action) { }
static inline void unregister_handler_proc(unsigned int irq,
					   struct irqaction *action) { }
#endif

extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);

extern void irq_set_thread_affinity(struct irq_desc *desc);

extern int irq_do_set_affinity(struct irq_data *data,
			       const struct cpumask *dest, bool force);

/* Inline functions for support of irq chips on slow busses */
static inline void chip_bus_lock(struct irq_desc *desc)
{
	if (unlikely(desc->irq_data.chip->irq_bus_lock))
		desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
}

static inline void chip_bus_sync_unlock(struct irq_desc *desc)
{
	if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
		desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
}

#define _IRQ_DESC_CHECK		(1 << 0)
#define _IRQ_DESC_PERCPU	(1 << 1)

#define IRQ_GET_DESC_CHECK_GLOBAL	(_IRQ_DESC_CHECK)
#define IRQ_GET_DESC_CHECK_PERCPU	(_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)

struct irq_desc *
__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
		    unsigned int check);
void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);

static inline struct irq_desc *
irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
{
	return __irq_get_desc_lock(irq, flags, true, check);
}

static inline void
irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
{
	__irq_put_desc_unlock(desc, flags, true);
}

static inline struct irq_desc *
irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
{
	return __irq_get_desc_lock(irq, flags, false, check);
}

static inline void
irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
{
	__irq_put_desc_unlock(desc, flags, false);
}

/*
 * Manipulation functions for irq_data.state
 */
static inline void irqd_set_move_pending(struct irq_data *d)
{
	__irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
}

static inline void irqd_clr_move_pending(struct irq_data *d)
{
	__irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
}

static inline void irqd_clear(struct irq_data *d, unsigned int mask)
{
	__irqd_to_state(d) &= ~mask;
}

static inline void irqd_set(struct irq_data *d, unsigned int mask)
{
	__irqd_to_state(d) |= mask;
}

static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
{
	return __irqd_to_state(d) & mask;
}

static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
{
	__this_cpu_inc(*desc->kstat_irqs);
	__this_cpu_inc(kstat.irqs_sum);
}

static inline int irq_desc_get_node(struct irq_desc *desc)
{
	return irq_common_data_get_node(&desc->irq_common_data);
}

static inline int irq_desc_is_chained(struct irq_desc *desc)
{
	return (desc->action && desc->action == &chained_action);
}

#ifdef CONFIG_PM_SLEEP
bool irq_pm_check_wakeup(struct irq_desc *desc);
void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
#else
static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
static inline void
irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
static inline void
irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
#endif