linux/include/linux/irqdesc.h
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   1#ifndef _LINUX_IRQDESC_H
   2#define _LINUX_IRQDESC_H
   3
   4/*
   5 * Core internal functions to deal with irq descriptors
   6 *
   7 * This include will move to kernel/irq once we cleaned up the tree.
   8 * For now it's included from <linux/irq.h>
   9 */
  10
  11struct irq_affinity_notify;
  12struct proc_dir_entry;
  13struct module;
  14struct irq_desc;
  15
  16/**
  17 * struct irq_desc - interrupt descriptor
  18 * @irq_data:           per irq and chip data passed down to chip functions
  19 * @kstat_irqs:         irq stats per cpu
  20 * @handle_irq:         highlevel irq-events handler
  21 * @preflow_handler:    handler called before the flow handler (currently used by sparc)
  22 * @action:             the irq action chain
  23 * @status:             status information
  24 * @core_internal_state__do_not_mess_with_it: core internal status information
  25 * @depth:              disable-depth, for nested irq_disable() calls
  26 * @wake_depth:         enable depth, for multiple irq_set_irq_wake() callers
  27 * @irq_count:          stats field to detect stalled irqs
  28 * @last_unhandled:     aging timer for unhandled count
  29 * @irqs_unhandled:     stats field for spurious unhandled interrupts
  30 * @lock:               locking for SMP
  31 * @affinity_hint:      hint to user space for preferred irq affinity
  32 * @affinity_notify:    context for notification of affinity changes
  33 * @pending_mask:       pending rebalanced interrupts
  34 * @threads_oneshot:    bitfield to handle shared oneshot threads
  35 * @threads_active:     number of irqaction threads currently running
  36 * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
  37 * @dir:                /proc/irq/ procfs entry
  38 * @name:               flow handler name for /proc/interrupts output
  39 */
  40struct irq_desc {
  41        struct irq_data         irq_data;
  42        unsigned int __percpu   *kstat_irqs;
  43        irq_flow_handler_t      handle_irq;
  44#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
  45        irq_preflow_handler_t   preflow_handler;
  46#endif
  47        struct irqaction        *action;        /* IRQ action list */
  48        unsigned int            status_use_accessors;
  49        unsigned int            core_internal_state__do_not_mess_with_it;
  50        unsigned int            depth;          /* nested irq disables */
  51        unsigned int            wake_depth;     /* nested wake enables */
  52        unsigned int            irq_count;      /* For detecting broken IRQs */
  53        unsigned long           last_unhandled; /* Aging timer for unhandled count */
  54        unsigned int            irqs_unhandled;
  55        raw_spinlock_t          lock;
  56        struct cpumask          *percpu_enabled;
  57#ifdef CONFIG_SMP
  58        const struct cpumask    *affinity_hint;
  59        struct irq_affinity_notify *affinity_notify;
  60#ifdef CONFIG_GENERIC_PENDING_IRQ
  61        cpumask_var_t           pending_mask;
  62#endif
  63#endif
  64        unsigned long           threads_oneshot;
  65        atomic_t                threads_active;
  66        wait_queue_head_t       wait_for_threads;
  67#ifdef CONFIG_PROC_FS
  68        struct proc_dir_entry   *dir;
  69#endif
  70        int                     parent_irq;
  71        struct module           *owner;
  72        const char              *name;
  73} ____cacheline_internodealigned_in_smp;
  74
  75#ifndef CONFIG_SPARSE_IRQ
  76extern struct irq_desc irq_desc[NR_IRQS];
  77#endif
  78
  79#ifdef CONFIG_GENERIC_HARDIRQS
  80
  81static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
  82{
  83        return &desc->irq_data;
  84}
  85
  86static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
  87{
  88        return desc->irq_data.chip;
  89}
  90
  91static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
  92{
  93        return desc->irq_data.chip_data;
  94}
  95
  96static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
  97{
  98        return desc->irq_data.handler_data;
  99}
 100
 101static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
 102{
 103        return desc->irq_data.msi_desc;
 104}
 105
 106/*
 107 * Architectures call this to let the generic IRQ layer
 108 * handle an interrupt. If the descriptor is attached to an
 109 * irqchip-style controller then we call the ->handle_irq() handler,
 110 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 111 */
 112static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
 113{
 114        desc->handle_irq(irq, desc);
 115}
 116
 117int generic_handle_irq(unsigned int irq);
 118
 119/* Test to see if a driver has successfully requested an irq */
 120static inline int irq_has_action(unsigned int irq)
 121{
 122        struct irq_desc *desc = irq_to_desc(irq);
 123        return desc->action != NULL;
 124}
 125
 126/* caller has locked the irq_desc and both params are valid */
 127static inline void __irq_set_handler_locked(unsigned int irq,
 128                                            irq_flow_handler_t handler)
 129{
 130        struct irq_desc *desc;
 131
 132        desc = irq_to_desc(irq);
 133        desc->handle_irq = handler;
 134}
 135
 136/* caller has locked the irq_desc and both params are valid */
 137static inline void
 138__irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
 139                                   irq_flow_handler_t handler, const char *name)
 140{
 141        struct irq_desc *desc;
 142
 143        desc = irq_to_desc(irq);
 144        irq_desc_get_irq_data(desc)->chip = chip;
 145        desc->handle_irq = handler;
 146        desc->name = name;
 147}
 148
 149static inline int irq_balancing_disabled(unsigned int irq)
 150{
 151        struct irq_desc *desc;
 152
 153        desc = irq_to_desc(irq);
 154        return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
 155}
 156
 157static inline void
 158irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
 159{
 160        struct irq_desc *desc = irq_to_desc(irq);
 161
 162        if (desc)
 163                lockdep_set_class(&desc->lock, class);
 164}
 165
 166#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 167static inline void
 168__irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
 169{
 170        struct irq_desc *desc;
 171
 172        desc = irq_to_desc(irq);
 173        desc->preflow_handler = handler;
 174}
 175#endif
 176#endif
 177
 178#endif
 179
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