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 module;
  14 struct 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  */
  40 struct 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
  76 extern struct irq_desc irq_desc[NR_IRQS];
  77 #endif
  78
  79 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
  80 {
  81         return &desc->irq_data;
  82 }
  83
  84 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
  85 {
  86         return desc->irq_data.chip;
  87 }
  88
  89 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
  90 {
  91         return desc->irq_data.chip_data;
  92 }
  93
  94 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
  95 {
  96         return desc->irq_data.handler_data;
  97 }
  98
  99 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
 100 {
 101         return desc->irq_data.msi_desc;
 102 }
 103
 104 /*
 105  * Architectures call this to let the generic IRQ layer
 106  * handle an interrupt. If the descriptor is attached to an
 107  * irqchip-style controller then we call the ->handle_irq() handler,
 108  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 109  */
 110 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
 111 {
 112         desc->handle_irq(irq, desc);
 113 }
 114
 115 int generic_handle_irq(unsigned int irq);
 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 int irq_is_percpu(unsigned int irq)
 156 {
 157         struct irq_desc *desc;
 158
 159         desc = irq_to_desc(irq);
 160         return desc->status_use_accessors & IRQ_PER_CPU;
 161 }
 162
 163 static inline void
 164 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
 165 {
 166         struct irq_desc *desc = irq_to_desc(irq);
 167
 168         if (desc)
 169                 lockdep_set_class(&desc->lock, class);
 170 }
 171
 172 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 173 static inline void
 174 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
 175 {
 176         struct irq_desc *desc;
 177
 178         desc = irq_to_desc(irq);
 179         desc->preflow_handler = handler;
 180 }
 181 #endif
 182
 183 #endif