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#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 <asm/irq.h>
#include <asm/ptrace.h>
/*
* IRQ line status.
*/
#define IRQ_INPROGRESS 1 /* IRQ handler active - do not enter! */
#define IRQ_DISABLED 2 /* IRQ disabled - do not enter! */
#define IRQ_PENDING 4 /* IRQ pending - replay on enable */
#define IRQ_REPLAY 8 /* IRQ has been replayed but not acked yet */
#define IRQ_AUTODETECT 16 /* IRQ is being autodetected */
#define IRQ_WAITING 32 /* IRQ not yet seen - for autodetection */
#define IRQ_LEVEL 64 /* IRQ level triggered */
#define IRQ_MASKED 128 /* IRQ masked - shouldn't be seen again */
#ifdef CONFIG_IRQ_PER_CPU
# define IRQ_PER_CPU 256 /* IRQ is per CPU */
# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
#else
# define CHECK_IRQ_PER_CPU(var) 0
#endif
/**
* struct hw_interrupt_type - hardware interrupt type 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)
* @handle_irq: irq flow handler called from the arch IRQ glue code
* @ack: start of a new interrupt
* @mask: mask an interrupt source
* @mask_ack: ack and mask an interrupt source
* @unmask: unmask an interrupt source
* @hold: same interrupt while the handler is running
* @end: end of interrupt
* @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
*/
struct hw_interrupt_type {
const char *typename;
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 (*end)(unsigned int irq);
void (*set_affinity)(unsigned int irq, cpumask_t dest);
int (*retrigger)(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
};
typedef struct hw_interrupt_type hw_irq_controller;
struct proc_dir_entry;
/**
* struct irq_desc - interrupt descriptor
*
* @handler: interrupt type dependent handler functions
* @handler_data: data for the type handlers
* @action: the irq action chain
* @status: status information
* @depth: disable-depth, for nested irq_disable() calls
* @irq_count: stats field to detect stalled irqs
* @irqs_unhandled: stats field for spurious unhandled interrupts
* @lock: locking for SMP
* @affinity: IRQ affinity on SMP
* @pending_mask: pending rebalanced interrupts
* @move_irq: need to re-target IRQ destination
* @dir: /proc/irq/ procfs entry
* @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP
*
* Pad this out to 32 bytes for cache and indexing reasons.
*/
struct irq_desc {
hw_irq_controller *chip;
void *chip_data;
struct irqaction *action; /* IRQ action list */
unsigned int status; /* IRQ status */
unsigned int depth; /* nested irq disables */
unsigned int irq_count; /* For detecting broken IRQs */
unsigned int irqs_unhandled;
spinlock_t lock;
#ifdef CONFIG_SMP
cpumask_t affinity;
#endif
#if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
cpumask_t pending_mask;
unsigned int move_irq; /* need to re-target IRQ dest */
#endif
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *dir;
#endif
} ____cacheline_aligned;
extern struct irq_desc irq_desc[NR_IRQS];
/*
* Migration helpers for obsolete names, they will go away:
*/
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
static inline void set_native_irq_info(int irq, cpumask_t mask)
{
irq_desc[irq].affinity = mask;
}
#else
static inline void set_native_irq_info(int irq, cpumask_t mask)
{
}
#endif
#ifdef CONFIG_SMP
#if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
void set_pending_irq(unsigned int irq, cpumask_t mask);
void move_native_irq(int irq);
#ifdef CONFIG_PCI_MSI
/*
* Wonder why these are dummies?
* For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
* counter part after translating the vector to irq info. We need to perform
* this operation on the real irq, when we dont use vector, i.e when
* pci_use_vector() is false.
*/
static inline void move_irq(int irq)
{
}
static inline void set_irq_info(int irq, cpumask_t mask)
{
}
#else /* CONFIG_PCI_MSI */
static inline void move_irq(int irq)
{
move_native_irq(irq);
}
static inline void set_irq_info(int irq, cpumask_t mask)
{
set_native_irq_info(irq, mask);
}
#endif /* CONFIG_PCI_MSI */
#else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
static inline void move_irq(int irq)
{
}
static inline void move_native_irq(int irq)
{
}
static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
{
}
static inline void set_irq_info(int irq, cpumask_t mask)
{
set_native_irq_info(irq, mask);
}
#endif /* CONFIG_GENERIC_PENDING_IRQ */
#else /* CONFIG_SMP */
#define move_irq(x)
#define move_native_irq(x)
#endif /* CONFIG_SMP */
#ifdef CONFIG_IRQBALANCE
extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
#else
static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
{
}
#endif
#ifdef CONFIG_AUTO_IRQ_AFFINITY
extern int select_smp_affinity(unsigned int irq);
#else
static inline int select_smp_affinity(unsigned int irq)
{
return 1;
}
#endif
extern int no_irq_affinity;
extern int noirqdebug_setup(char *str);
extern irqreturn_t handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
struct irqaction *action);
/*
* Explicit fastcall, because i386 4KSTACKS calls it from assembly:
*/
extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
int action_ret, struct pt_regs *regs);
extern int can_request_irq(unsigned int irq, unsigned long irqflags);
/* Resending of interrupts :*/
void check_irq_resend(struct irq_desc *desc, unsigned int irq);
extern void init_irq_proc(void);
#endif /* CONFIG_GENERIC_HARDIRQS */
extern hw_irq_controller no_irq_type; /* needed in every arch ? */
#endif /* !CONFIG_S390 */
#endif /* _LINUX_IRQ_H */
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