/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_IRQDESC_H
#define _LINUX_IRQDESC_H

#include <linux/irq_work.h>
#include <linux/kobject.h>
#include <linux/mutex.h>
#include <linux/rcupdate.h>

/*
 * Core internal functions to deal with irq descriptors
 */

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

/**
 * struct irqstat - interrupt statistics
 * @cnt:        real-time interrupt count
 * @ref:        snapshot of interrupt count
 */
struct irqstat {
        unsigned int    cnt;
#ifdef CONFIG_GENERIC_IRQ_STAT_SNAPSHOT
        unsigned int    ref;
#endif
};

/**
 * struct irq_redirect - interrupt redirection metadata
 * @work:       Harg irq_work item for handler execution on a different CPU
 * @target_cpu: CPU to run irq handler on in case the current CPU is not part
 *              of the irq affinity mask
 */
struct irq_redirect {
        struct irq_work work;
        unsigned int    target_cpu;
};

/**
 * struct irq_desc - interrupt descriptor
 * @irq_common_data:    per irq and chip data passed down to chip functions
 * @kstat_irqs:         irq stats per cpu
 * @handle_irq:         highlevel irq-events handler
 * @action:             the irq action chain
 * @status_use_accessors: 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
 * @tot_count:          stats field for non-percpu irqs
 * @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 threaded handlers
 * @lock:               locking for SMP
 * @redirect:           Facility for redirecting interrupts via irq_work
 * @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
 * @rcu:                rcu head for delayed free
 * @kobj:               kobject used to represent this struct in sysfs
 * @request_mutex:      mutex to protect request/free before locking desc->lock
 * @dir:                /proc/irq/ procfs entry
 * @debugfs_file:       dentry for the debugfs file
 * @name:               flow handler name for /proc/interrupts output
 */
struct irq_desc {
        struct irq_common_data  irq_common_data;
        struct irq_data         irq_data;
        struct irqstat __percpu *kstat_irqs;
        irq_flow_handler_t      handle_irq;
        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            tot_count;
        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
        struct irq_redirect     redirect;
        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            cond_suspend_depth;
        unsigned int            force_resume_depth;
#endif
#ifdef CONFIG_PROC_FS
        struct proc_dir_entry   *dir;
#endif
#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
        struct dentry           *debugfs_file;
        const char              *dev_name;
#endif
#ifdef CONFIG_SPARSE_IRQ
        struct rcu_head         rcu;
        struct kobject          kobj;
#endif
        struct mutex            request_mutex;
        int                     parent_irq;
        struct module           *owner;
        const char              *name;
#ifdef CONFIG_HARDIRQS_SW_RESEND
        struct hlist_node       resend_node;
#endif
} ____cacheline_internodealigned_in_smp;

#ifdef CONFIG_SPARSE_IRQ
extern void irq_lock_sparse(void);
extern void irq_unlock_sparse(void);
#else
static inline void irq_lock_sparse(void) { }
static inline void irq_unlock_sparse(void) { }
extern struct irq_desc irq_desc[NR_IRQS];
#endif

static inline unsigned int irq_desc_kstat_cpu(struct irq_desc *desc,
                                              unsigned int cpu)
{
        return desc->kstat_irqs ? per_cpu(desc->kstat_irqs->cnt, cpu) : 0;
}

static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
{
        return container_of(data->common, struct irq_desc, irq_common_data);
}

static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
{
        return desc->irq_data.irq;
}

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_common_data.handler_data;
}

/*
 * Architectures call this to let the generic IRQ layer
 * handle an interrupt.
 */
static inline void generic_handle_irq_desc(struct irq_desc *desc)
{
        desc->handle_irq(desc);
}

int handle_irq_desc(struct irq_desc *desc);
int generic_handle_irq(unsigned int irq);
int generic_handle_irq_safe(unsigned int irq);

#ifdef CONFIG_IRQ_DOMAIN
/*
 * Convert a HW interrupt number to a logical one using a IRQ domain,
 * and handle the result interrupt number. Return -EINVAL if
 * conversion failed.
 */
int generic_handle_domain_irq(struct irq_domain *domain, irq_hw_number_t hwirq);
int generic_handle_domain_irq_safe(struct irq_domain *domain, irq_hw_number_t hwirq);
int generic_handle_domain_nmi(struct irq_domain *domain, irq_hw_number_t hwirq);
bool generic_handle_demux_domain_irq(struct irq_domain *domain, irq_hw_number_t hwirq);
#endif

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

/**
 * irq_set_handler_locked - Set irq handler from a locked region
 * @data:       Pointer to the irq_data structure which identifies the irq
 * @handler:    Flow control handler function for this interrupt
 *
 * Sets the handler in the irq descriptor associated to @data.
 *
 * Must be called with irq_desc locked and valid parameters. Typical
 * call site is the irq_set_type() callback.
 */
static inline void irq_set_handler_locked(struct irq_data *data,
                                          irq_flow_handler_t handler)
{
        struct irq_desc *desc = irq_data_to_desc(data);

        desc->handle_irq = handler;
}

/**
 * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
 * @data:       Pointer to the irq_data structure for which the chip is set
 * @chip:       Pointer to the new irq chip
 * @handler:    Flow control handler function for this interrupt
 * @name:       Name of the interrupt
 *
 * Replace the irq chip at the proper hierarchy level in @data and
 * sets the handler and name in the associated irq descriptor.
 *
 * Must be called with irq_desc locked and valid parameters.
 */
static inline void
irq_set_chip_handler_name_locked(struct irq_data *data,
                                 const struct irq_chip *chip,
                                 irq_flow_handler_t handler, const char *name)
{
        struct irq_desc *desc = irq_data_to_desc(data);

        desc->handle_irq = handler;
        desc->name = name;
        data->chip = (struct irq_chip *)chip;
}

bool irq_check_status_bit(unsigned int irq, unsigned int bitmask);

static inline bool irq_balancing_disabled(unsigned int irq)
{
        return irq_check_status_bit(irq, IRQ_NO_BALANCING_MASK);
}

static inline bool irq_is_percpu(unsigned int irq)
{
        return irq_check_status_bit(irq, IRQ_PER_CPU);
}

static inline bool irq_is_percpu_devid(unsigned int irq)
{
        return irq_check_status_bit(irq, IRQ_PER_CPU_DEVID);
}

void __irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class,
                             struct lock_class_key *request_class);
static inline void
irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class,
                      struct lock_class_key *request_class)
{
        if (IS_ENABLED(CONFIG_LOCKDEP))
                __irq_set_lockdep_class(irq, lock_class, request_class);
}

#endif