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  * @threads_handled:    stats field for deferred spurious detection of threaded handlers
  31  * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers
  32  * @lock:               locking for SMP
  33  * @affinity_hint:      hint to user space for preferred irq affinity
  34  * @affinity_notify:    context for notification of affinity changes
  35  * @pending_mask:       pending rebalanced interrupts
  36  * @threads_oneshot:    bitfield to handle shared oneshot threads
  37  * @threads_active:     number of irqaction threads currently running
  38  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
  39  * @dir:                /proc/irq/ procfs entry
  40  * @name:               flow handler name for /proc/interrupts output
  41  */
  42 struct irq_desc {
  43         struct irq_data         irq_data;
  44         unsigned int __percpu   *kstat_irqs;
  45         irq_flow_handler_t      handle_irq;
  46 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
  47         irq_preflow_handler_t   preflow_handler;
  48 #endif
  49         struct irqaction        *action;        /* IRQ action list */
  50         unsigned int            status_use_accessors;
  51         unsigned int            core_internal_state__do_not_mess_with_it;
  52         unsigned int            depth;          /* nested irq disables */
  53         unsigned int            wake_depth;     /* nested wake enables */
  54         unsigned int            irq_count;      /* For detecting broken IRQs */
  55         unsigned long           last_unhandled; /* Aging timer for unhandled count */
  56         unsigned int            irqs_unhandled;
  57         atomic_t                threads_handled;
  58         int                     threads_handled_last;
  59         raw_spinlock_t          lock;
  60         struct cpumask          *percpu_enabled;
  61 #ifdef CONFIG_SMP
  62         const struct cpumask    *affinity_hint;
  63         struct irq_affinity_notify *affinity_notify;
  64 #ifdef CONFIG_GENERIC_PENDING_IRQ
  65         cpumask_var_t           pending_mask;
  66 #endif
  67 #endif
  68         unsigned long           threads_oneshot;
  69         atomic_t                threads_active;
  70         wait_queue_head_t       wait_for_threads;
  71 #ifdef CONFIG_PROC_FS
  72         struct proc_dir_entry   *dir;
  73 #endif
  74         int                     parent_irq;
  75         struct module           *owner;
  76         const char              *name;
  77 } ____cacheline_internodealigned_in_smp;
  78
  79 #ifndef CONFIG_SPARSE_IRQ
  80 extern struct irq_desc irq_desc[NR_IRQS];
  81 #endif
  82
  83 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
  84 {
  85         return &desc->irq_data;
  86 }
  87
  88 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
  89 {
  90         return desc->irq_data.chip;
  91 }
  92
  93 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
  94 {
  95         return desc->irq_data.chip_data;
  96 }
  97
  98 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
  99 {
 100         return desc->irq_data.handler_data;
 101 }
 102
 103 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
 104 {
 105         return desc->irq_data.msi_desc;
 106 }
 107
 108 /*
 109  * Architectures call this to let the generic IRQ layer
 110  * handle an interrupt. If the descriptor is attached to an
 111  * irqchip-style controller then we call the ->handle_irq() handler,
 112  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 113  */
 114 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
 115 {
 116         desc->handle_irq(irq, desc);
 117 }
 118
 119 int generic_handle_irq(unsigned int irq);
 120
 121 /* Test to see if a driver has successfully requested an irq */
 122 static inline int irq_has_action(unsigned int irq)
 123 {
 124         struct irq_desc *desc = irq_to_desc(irq);
 125         return desc->action != NULL;
 126 }
 127
 128 /* caller has locked the irq_desc and both params are valid */
 129 static inline void __irq_set_handler_locked(unsigned int irq,
 130                                             irq_flow_handler_t handler)
 131 {
 132         struct irq_desc *desc;
 133
 134         desc = irq_to_desc(irq);
 135         desc->handle_irq = handler;
 136 }
 137
 138 /* caller has locked the irq_desc and both params are valid */
 139 static inline void
 140 __irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
 141                                    irq_flow_handler_t handler, const char *name)
 142 {
 143         struct irq_desc *desc;
 144
 145         desc = irq_to_desc(irq);
 146         irq_desc_get_irq_data(desc)->chip = chip;
 147         desc->handle_irq = handler;
 148         desc->name = name;
 149 }
 150
 151 static inline int irq_balancing_disabled(unsigned int irq)
 152 {
 153         struct irq_desc *desc;
 154
 155         desc = irq_to_desc(irq);
 156         return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
 157 }
 158
 159 static inline int irq_is_percpu(unsigned int irq)
 160 {
 161         struct irq_desc *desc;
 162
 163         desc = irq_to_desc(irq);
 164         return desc->status_use_accessors & IRQ_PER_CPU;
 165 }
 166
 167 static inline void
 168 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
 169 {
 170         struct irq_desc *desc = irq_to_desc(irq);
 171
 172         if (desc)
 173                 lockdep_set_class(&desc->lock, class);
 174 }
 175
 176 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 177 static inline void
 178 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
 179 {
 180         struct irq_desc *desc;
 181
 182         desc = irq_to_desc(irq);
 183         desc->preflow_handler = handler;
 184 }
 185 #endif
 186
 187 #endif