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