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
  20  * @preflow_handler:    handler called before the flow handler (currently used by sparc)
  21  * @action:             the irq action chain
  22  * @status:             status information
  23  * @core_internal_state__do_not_mess_with_it: core internal status information
  24  * @depth:              disable-depth, for nested irq_disable() calls
  25  * @wake_depth:         enable depth, for multiple irq_set_irq_wake() callers
  26  * @irq_count:          stats field to detect stalled irqs
  27  * @last_unhandled:     aging timer for unhandled count
  28  * @irqs_unhandled:     stats field for spurious unhandled interrupts
  29  * @lock:               locking for SMP
  30  * @affinity_hint:      hint to user space for preferred irq affinity
  31  * @affinity_notify:    context for notification of affinity changes
  32  * @pending_mask:       pending rebalanced interrupts
  33  * @threads_oneshot:    bitfield to handle shared oneshot threads
  34  * @threads_active:     number of irqaction threads currently running
  35  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
  36  * @dir:                /proc/irq/ procfs entry
  37  * @name:               flow handler name for /proc/interrupts output
  38  */
  39 struct irq_desc {
  40         struct irq_data         irq_data;
  41         struct timer_rand_state *timer_rand_state;
  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 #ifdef CONFIG_SMP
  57         const struct cpumask    *affinity_hint;
  58         struct irq_affinity_notify *affinity_notify;
  59 #ifdef CONFIG_GENERIC_PENDING_IRQ
  60         cpumask_var_t           pending_mask;
  61 #endif
  62 #endif
  63         unsigned long           threads_oneshot;
  64         atomic_t                threads_active;
  65         wait_queue_head_t       wait_for_threads;
  66 #ifdef CONFIG_PROC_FS
  67         struct proc_dir_entry   *dir;
  68 #endif
  69         const char              *name;
  70 } ____cacheline_internodealigned_in_smp;
  71
  72 #ifndef CONFIG_SPARSE_IRQ
  73 extern struct irq_desc irq_desc[NR_IRQS];
  74 #endif
  75
  76 #ifdef CONFIG_GENERIC_HARDIRQS
  77
  78 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
  79 {
  80         return &desc->irq_data;
  81 }
  82
  83 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
  84 {
  85         return desc->irq_data.chip;
  86 }
  87
  88 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
  89 {
  90         return desc->irq_data.chip_data;
  91 }
  92
  93 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
  94 {
  95         return desc->irq_data.handler_data;
  96 }
  97
  98 static 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  */
 109 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
 110 {
 111         desc->handle_irq(irq, desc);
 112 }
 113
 114 int generic_handle_irq(unsigned int irq);
 115
 116 /* Test to see if a driver has successfully requested an irq */
 117 static 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 */
 124 static 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 */
 134 static 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
 146 static 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
 154 static inline void
 155 irq_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
 164 static 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