include/linux/irqdesc.h

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This source file includes following definitions.
irq_desc_get_irq_data
irq_desc_get_chip
irq_desc_get_chip_data
irq_desc_get_handler_data
irq_desc_get_msi_desc
generic_handle_irq_desc
handle_domain_irq
irq_has_action
__irq_set_handler_locked
__irq_set_chip_handler_name_locked
irq_balancing_disabled
irq_is_percpu
irq_set_lockdep_class
__irq_set_preflow_handler
#ifndef _LINUX_IRQDESC_H
#define _LINUX_IRQDESC_H

/*
 * Core internal functions to deal with irq descriptors
 *
 * This include will move to kernel/irq once we cleaned up the tree.
 * For now it's included from <linux/irq.h>
 */

struct irq_affinity_notify;
struct proc_dir_entry;
struct module;
struct irq_desc;
struct irq_domain;
struct pt_regs;

/**
 * struct irq_desc - interrupt descriptor
 * @irq_data:           per irq and chip data passed down to chip functions
 * @kstat_irqs:         irq stats per cpu
 * @handle_irq:         highlevel irq-events handler
 * @preflow_handler:    handler called before the flow handler (currently used by sparc)
 * @action:             the irq action chain
 * @status:             status information
 * @core_internal_state__do_not_mess_with_it: core internal status information
 * @depth:              disable-depth, for nested irq_disable() calls
 * @wake_depth:         enable depth, for multiple irq_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
 * @threads_handled:    stats field for deferred spurious detection of threaded handlers
 * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers
 * @lock:               locking for SMP
 * @affinity_hint:      hint to user space for preferred irq affinity
 * @affinity_notify:    context for notification of affinity changes
 * @pending_mask:       pending rebalanced interrupts
 * @threads_oneshot:    bitfield to handle shared oneshot threads
 * @threads_active:     number of irqaction threads currently running
 * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
 * @nr_actions:         number of installed actions on this descriptor
 * @no_suspend_depth:   number of irqactions on a irq descriptor with
 *                      IRQF_NO_SUSPEND set
 * @force_resume_depth: number of irqactions on a irq descriptor with
 *                      IRQF_FORCE_RESUME set
 * @dir:                /proc/irq/ procfs entry
 * @name:               flow handler name for /proc/interrupts output
 */
struct irq_desc {
        struct irq_data         irq_data;
        unsigned int __percpu   *kstat_irqs;
        irq_flow_handler_t      handle_irq;
#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
        irq_preflow_handler_t   preflow_handler;
#endif
        struct irqaction        *action;        /* IRQ action list */
        unsigned int            status_use_accessors;
        unsigned int            core_internal_state__do_not_mess_with_it;
        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;
        atomic_t                threads_handled;
        int                     threads_handled_last;
        raw_spinlock_t          lock;
        struct cpumask          *percpu_enabled;
#ifdef CONFIG_SMP
        const struct cpumask    *affinity_hint;
        struct irq_affinity_notify *affinity_notify;
#ifdef CONFIG_GENERIC_PENDING_IRQ
        cpumask_var_t           pending_mask;
#endif
#endif
        unsigned long           threads_oneshot;
        atomic_t                threads_active;
        wait_queue_head_t       wait_for_threads;
#ifdef CONFIG_PM_SLEEP
        unsigned int            nr_actions;
        unsigned int            no_suspend_depth;
        unsigned int            force_resume_depth;
#endif
#ifdef CONFIG_PROC_FS
        struct proc_dir_entry   *dir;
#endif
        int                     parent_irq;
        struct module           *owner;
        const char              *name;
} ____cacheline_internodealigned_in_smp;

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

static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
{
        return &desc->irq_data;
}

static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
{
        return desc->irq_data.chip;
}

static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
{
        return desc->irq_data.chip_data;
}

static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
{
        return desc->irq_data.handler_data;
}

static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
{
        return desc->irq_data.msi_desc;
}

/*
 * 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)
{
        desc->handle_irq(irq, desc);
}

int generic_handle_irq(unsigned int irq);

#ifdef CONFIG_HANDLE_DOMAIN_IRQ
/*
 * Convert a HW interrupt number to a logical one using a IRQ domain,
 * and handle the result interrupt number. Return -EINVAL if
 * conversion failed. Providing a NULL domain indicates that the
 * conversion has already been done.
 */
int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
                        bool lookup, struct pt_regs *regs);

static inline int handle_domain_irq(struct irq_domain *domain,
                                    unsigned int hwirq, struct pt_regs *regs)
{
        return __handle_domain_irq(domain, hwirq, true, regs);
}
#endif

/* 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;
}

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

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

/* caller has locked the irq_desc and both params are valid */
static inline void
__irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
                                   irq_flow_handler_t handler, const char *name)
{
        struct irq_desc *desc;

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

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

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

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

        desc = irq_to_desc(irq);
        return desc->status_use_accessors & IRQ_PER_CPU;
}

static inline void
irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
{
        struct irq_desc *desc = irq_to_desc(irq);

        if (desc)
                lockdep_set_class(&desc->lock, class);
}

#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
static inline void
__irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
{
        struct irq_desc *desc;

        desc = irq_to_desc(irq);
        desc->preflow_handler = handler;
}
#endif

#endif
/* [<][>][^][v][top][bottom][index][help] */
root/include/linux/irqdesc.h

INCLUDED FROM

DEFINITIONS
