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 timer_rand_state;
  14struct module;
  15/**
  16 * struct irq_desc - interrupt descriptor
  17 * @irq_data:           per irq and chip data passed down to chip functions
  18 * @timer_rand_state:   pointer to timer rand state struct
  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        struct module           *owner;
  71        const char              *name;
  72} ____cacheline_internodealigned_in_smp;
  73
  74#ifndef CONFIG_SPARSE_IRQ
  75extern struct irq_desc irq_desc[NR_IRQS];
  76#endif
  77
  78#ifdef CONFIG_GENERIC_HARDIRQS
  79
  80static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
  81{
  82        return &desc->irq_data;
  83}
  84
  85static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
  86{
  87        return desc->irq_data.chip;
  88}
  89
  90static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
  91{
  92        return desc->irq_data.chip_data;
  93}
  94
  95static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
  96{
  97        return desc->irq_data.handler_data;
  98}
  99
 100static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
 101{
 102        return desc->irq_data.msi_desc;
 103}
 104
 105/*
 106 * Architectures call this to let the generic IRQ layer
 107 * handle an interrupt. If the descriptor is attached to an
 108 * irqchip-style controller then we call the ->handle_irq() handler,
 109 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 110 */
 111static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
 112{
 113        desc->handle_irq(irq, desc);
 114}
 115
 116int generic_handle_irq(unsigned int irq);
 117
 118/* Test to see if a driver has successfully requested an irq */
 119static inline int irq_has_action(unsigned int irq)
 120{
 121        struct irq_desc *desc = irq_to_desc(irq);
 122        return desc->action != NULL;
 123}
 124
 125/* caller has locked the irq_desc and both params are valid */
 126static inline void __irq_set_handler_locked(unsigned int irq,
 127                                            irq_flow_handler_t handler)
 128{
 129        struct irq_desc *desc;
 130
 131        desc = irq_to_desc(irq);
 132        desc->handle_irq = handler;
 133}
 134
 135/* caller has locked the irq_desc and both params are valid */
 136static inline void
 137__irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
 138                                   irq_flow_handler_t handler, const char *name)
 139{
 140        struct irq_desc *desc;
 141
 142        desc = irq_to_desc(irq);
 143        irq_desc_get_irq_data(desc)->chip = chip;
 144        desc->handle_irq = handler;
 145        desc->name = name;
 146}
 147
 148static inline int irq_balancing_disabled(unsigned int irq)
 149{
 150        struct irq_desc *desc;
 151
 152        desc = irq_to_desc(irq);
 153        return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
 154}
 155
 156static inline void
 157irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
 158{
 159        struct irq_desc *desc = irq_to_desc(irq);
 160
 161        if (desc)
 162                lockdep_set_class(&desc->lock, class);
 163}
 164
 165#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 166static inline void
 167__irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
 168{
 169        struct irq_desc *desc;
 170
 171        desc = irq_to_desc(irq);
 172        desc->preflow_handler = handler;
 173}
 174#endif
 175#endif
 176
 177#endif
 178
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