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  * @depth:              disable-depth, for nested irq_disable() calls
  23  * @wake_depth:         enable depth, for multiple set_irq_wake() callers
  24  * @irq_count:          stats field to detect stalled irqs
  25  * @last_unhandled:     aging timer for unhandled count
  26  * @irqs_unhandled:     stats field for spurious unhandled interrupts
  27  * @lock:               locking for SMP
  28  * @affinity_notify:    context for notification of affinity changes
  29  * @pending_mask:       pending rebalanced interrupts
  30  * @threads_active:     number of irqaction threads currently running
  31  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
  32  * @dir:                /proc/irq/ procfs entry
  33  * @name:               flow handler name for /proc/interrupts output
  34  */
  35 struct irq_desc {
  36
  37 #ifdef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
  38         struct irq_data         irq_data;
  39 #else
  40         /*
  41          * This union will go away, once we fixed the direct access to
  42          * irq_desc all over the place. The direct fields are a 1:1
  43          * overlay of irq_data.
  44          */
  45         union {
  46                 struct irq_data         irq_data;
  47                 struct {
  48                         unsigned int            irq;
  49                         unsigned int            node;
  50                         struct irq_chip         *chip;
  51                         void                    *handler_data;
  52                         void                    *chip_data;
  53                         struct msi_desc         *msi_desc;
  54 #ifdef CONFIG_SMP
  55                         cpumask_var_t           affinity;
  56 #endif
  57                 };
  58         };
  59 #endif
  60
  61         struct timer_rand_state *timer_rand_state;
  62         unsigned int __percpu   *kstat_irqs;
  63         irq_flow_handler_t      handle_irq;
  64         struct irqaction        *action;        /* IRQ action list */
  65         unsigned int            status;         /* IRQ status */
  66
  67         unsigned int            depth;          /* nested irq disables */
  68         unsigned int            wake_depth;     /* nested wake enables */
  69         unsigned int            irq_count;      /* For detecting broken IRQs */
  70         unsigned long           last_unhandled; /* Aging timer for unhandled count */
  71         unsigned int            irqs_unhandled;
  72         raw_spinlock_t          lock;
  73 #ifdef CONFIG_SMP
  74         const struct cpumask    *affinity_hint;
  75         struct irq_affinity_notify *affinity_notify;
  76 #ifdef CONFIG_GENERIC_PENDING_IRQ
  77         cpumask_var_t           pending_mask;
  78 #endif
  79 #endif
  80         atomic_t                threads_active;
  81         wait_queue_head_t       wait_for_threads;
  82 #ifdef CONFIG_PROC_FS
  83         struct proc_dir_entry   *dir;
  84 #endif
  85         const char              *name;
  86 } ____cacheline_internodealigned_in_smp;
  87
  88 #ifndef CONFIG_SPARSE_IRQ
  89 extern struct irq_desc irq_desc[NR_IRQS];
  90 #endif
  91
  92 /* Will be removed once the last users in power and sh are gone */
  93 extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
  94 static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
  95 {
  96         return desc;
  97 }
  98
  99 #ifdef CONFIG_GENERIC_HARDIRQS
 100
 101 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
 102 {
 103         return desc->irq_data.chip;
 104 }
 105
 106 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
 107 {
 108         return desc->irq_data.chip_data;
 109 }
 110
 111 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
 112 {
 113         return desc->irq_data.handler_data;
 114 }
 115
 116 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
 117 {
 118         return desc->irq_data.msi_desc;
 119 }
 120
 121 #ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
 122 static inline struct irq_chip *get_irq_desc_chip(struct irq_desc *desc)
 123 {
 124         return irq_desc_get_chip(desc);
 125 }
 126 static inline void *get_irq_desc_data(struct irq_desc *desc)
 127 {
 128         return irq_desc_get_handler_data(desc);
 129 }
 130
 131 static inline void *get_irq_desc_chip_data(struct irq_desc *desc)
 132 {
 133         return irq_desc_get_chip_data(desc);
 134 }
 135
 136 static inline struct msi_desc *get_irq_desc_msi(struct irq_desc *desc)
 137 {
 138         return irq_desc_get_msi_desc(desc);
 139 }
 140 #endif
 141
 142 /*
 143  * Architectures call this to let the generic IRQ layer
 144  * handle an interrupt. If the descriptor is attached to an
 145  * irqchip-style controller then we call the ->handle_irq() handler,
 146  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 147  */
 148 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
 149 {
 150         desc->handle_irq(irq, desc);
 151 }
 152
 153 static inline void generic_handle_irq(unsigned int irq)
 154 {
 155         generic_handle_irq_desc(irq, irq_to_desc(irq));
 156 }
 157
 158 /* Test to see if a driver has successfully requested an irq */
 159 static inline int irq_has_action(unsigned int irq)
 160 {
 161         struct irq_desc *desc = irq_to_desc(irq);
 162         return desc->action != NULL;
 163 }
 164
 165 static inline int irq_balancing_disabled(unsigned int irq)
 166 {
 167         struct irq_desc *desc;
 168
 169         desc = irq_to_desc(irq);
 170         return desc->status & IRQ_NO_BALANCING_MASK;
 171 }
 172
 173 /* caller has locked the irq_desc and both params are valid */
 174 static inline void __set_irq_handler_unlocked(int irq,
 175                                               irq_flow_handler_t handler)
 176 {
 177         struct irq_desc *desc;
 178
 179         desc = irq_to_desc(irq);
 180         desc->handle_irq = handler;
 181 }
 182 #endif
 183
 184 #endif