include/linux/irqdesc.h

   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
  11 struct irq_affinity_notify;
  12 struct proc_dir_entry;
  13 struct timer_rand_state;
  14 /**
  15  * struct irq_desc - interrupt descriptor
  16  * @irq_data:           per irq and chip data passed down to chip functions
  17  * @timer_rand_state:   pointer to timer rand state struct
  18  * @kstat_irqs:         irq stats per cpu
  19  * @handle_irq:         highlevel irq-events handler [if NULL, __do_IRQ()]
  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_notify:    context for notification of affinity changes
  30  * @pending_mask:       pending rebalanced interrupts
  31  * @threads_oneshot:    bitfield to handle shared oneshot threads
  32  * @threads_active:     number of irqaction threads currently running
  33  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
  34  * @dir:                /proc/irq/ procfs entry
  35  * @name:               flow handler name for /proc/interrupts output
  36  */
  37 struct irq_desc {
  38         struct irq_data         irq_data;
  39         struct timer_rand_state *timer_rand_state;
  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 #ifdef CONFIG_SMP
  55         const struct cpumask    *affinity_hint;
  56         struct irq_affinity_notify *affinity_notify;
  57 #ifdef CONFIG_GENERIC_PENDING_IRQ
  58         cpumask_var_t           pending_mask;
  59 #endif
  60 #endif
  61         unsigned long           threads_oneshot;
  62         atomic_t                threads_active;
  63         wait_queue_head_t       wait_for_threads;
  64 #ifdef CONFIG_PROC_FS
  65         struct proc_dir_entry   *dir;
  66 #endif
  67         const char              *name;
  68 } ____cacheline_internodealigned_in_smp;
  69
  70 #ifndef CONFIG_SPARSE_IRQ
  71 extern struct irq_desc irq_desc[NR_IRQS];
  72 #endif
  73
  74 #ifdef CONFIG_GENERIC_HARDIRQS
  75
  76 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
  77 {
  78         return &desc->irq_data;
  79 }
  80
  81 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
  82 {
  83         return desc->irq_data.chip;
  84 }
  85
  86 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
  87 {
  88         return desc->irq_data.chip_data;
  89 }
  90
  91 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
  92 {
  93         return desc->irq_data.handler_data;
  94 }
  95
  96 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
  97 {
  98         return desc->irq_data.msi_desc;
  99 }
 100
 101 /*
 102  * Architectures call this to let the generic IRQ layer
 103  * handle an interrupt. If the descriptor is attached to an
 104  * irqchip-style controller then we call the ->handle_irq() handler,
 105  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 106  */
 107 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
 108 {
 109         desc->handle_irq(irq, desc);
 110 }
 111
 112 static inline void generic_handle_irq(unsigned int irq)
 113 {
 114         generic_handle_irq_desc(irq, irq_to_desc(irq));
 115 }
 116
 117 /* Test to see if a driver has successfully requested an irq */
 118 static inline int irq_has_action(unsigned int irq)
 119 {
 120         struct irq_desc *desc = irq_to_desc(irq);
 121         return desc->action != NULL;
 122 }
 123
 124 /* caller has locked the irq_desc and both params are valid */
 125 static inline void __irq_set_handler_locked(unsigned int irq,
 126                                             irq_flow_handler_t handler)
 127 {
 128         struct irq_desc *desc;
 129
 130         desc = irq_to_desc(irq);
 131         desc->handle_irq = handler;
 132 }
 133
 134 /* caller has locked the irq_desc and both params are valid */
 135 static inline void
 136 __irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
 137                                    irq_flow_handler_t handler, const char *name)
 138 {
 139         struct irq_desc *desc;
 140
 141         desc = irq_to_desc(irq);
 142         irq_desc_get_irq_data(desc)->chip = chip;
 143         desc->handle_irq = handler;
 144         desc->name = name;
 145 }
 146
 147 static inline int irq_balancing_disabled(unsigned int irq)
 148 {
 149         struct irq_desc *desc;
 150
 151         desc = irq_to_desc(irq);
 152         return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
 153 }
 154
 155 static inline void
 156 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
 157 {
 158         struct irq_desc *desc = irq_to_desc(irq);
 159
 160         if (desc)
 161                 lockdep_set_class(&desc->lock, class);
 162 }
 163
 164 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 165 static inline void
 166 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
 167 {
 168         struct irq_desc *desc;
 169
 170         desc = irq_to_desc(irq);
 171         desc->preflow_handler = handler;
 172 }
 173 #endif
 174 #endif
 175
 176 #endif