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 proc_dir_entry;
  12 struct timer_rand_state;
  13 /**
  14  * struct irq_desc - interrupt descriptor
  15  * @irq_data:           per irq and chip data passed down to chip functions
  16  * @timer_rand_state:   pointer to timer rand state struct
  17  * @kstat_irqs:         irq stats per cpu
  18  * @handle_irq:         highlevel irq-events handler [if NULL, __do_IRQ()]
  19  * @action:             the irq action chain
  20  * @status:             status information
  21  * @depth:              disable-depth, for nested irq_disable() calls
  22  * @wake_depth:         enable depth, for multiple set_irq_wake() callers
  23  * @irq_count:          stats field to detect stalled irqs
  24  * @last_unhandled:     aging timer for unhandled count
  25  * @irqs_unhandled:     stats field for spurious unhandled interrupts
  26  * @lock:               locking for SMP
  27  * @pending_mask:       pending rebalanced interrupts
  28  * @threads_active:     number of irqaction threads currently running
  29  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
  30  * @dir:                /proc/irq/ procfs entry
  31  * @name:               flow handler name for /proc/interrupts output
  32  */
  33 struct irq_desc {
  34
  35 #ifdef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
  36         struct irq_data         irq_data;
  37 #else
  38         /*
  39          * This union will go away, once we fixed the direct access to
  40          * irq_desc all over the place. The direct fields are a 1:1
  41          * overlay of irq_data.
  42          */
  43         union {
  44                 struct irq_data         irq_data;
  45                 struct {
  46                         unsigned int            irq;
  47                         unsigned int            node;
  48                         struct irq_chip         *chip;
  49                         void                    *handler_data;
  50                         void                    *chip_data;
  51                         struct msi_desc         *msi_desc;
  52 #ifdef CONFIG_SMP
  53                         cpumask_var_t           affinity;
  54 #endif
  55                 };
  56         };
  57 #endif
  58
  59         struct timer_rand_state *timer_rand_state;
  60         unsigned int            *kstat_irqs;
  61         irq_flow_handler_t      handle_irq;
  62         struct irqaction        *action;        /* IRQ action list */
  63         unsigned int            status;         /* IRQ status */
  64
  65         unsigned int            depth;          /* nested irq disables */
  66         unsigned int            wake_depth;     /* nested wake enables */
  67         unsigned int            irq_count;      /* For detecting broken IRQs */
  68         unsigned long           last_unhandled; /* Aging timer for unhandled count */
  69         unsigned int            irqs_unhandled;
  70         raw_spinlock_t          lock;
  71 #ifdef CONFIG_SMP
  72         const struct cpumask    *affinity_hint;
  73 #ifdef CONFIG_GENERIC_PENDING_IRQ
  74         cpumask_var_t           pending_mask;
  75 #endif
  76 #endif
  77         atomic_t                threads_active;
  78         wait_queue_head_t       wait_for_threads;
  79 #ifdef CONFIG_PROC_FS
  80         struct proc_dir_entry   *dir;
  81 #endif
  82         const char              *name;
  83 } ____cacheline_internodealigned_in_smp;
  84
  85 extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
  86                                         struct irq_desc *desc, int node);
  87 extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
  88
  89 #ifndef CONFIG_SPARSE_IRQ
  90 extern struct irq_desc irq_desc[NR_IRQS];
  91 #endif
  92
  93 #ifdef CONFIG_NUMA_IRQ_DESC
  94 extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node);
  95 #else
  96 static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
  97 {
  98         return desc;
  99 }
 100 #endif
 101
 102 extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
 103
 104 #ifdef CONFIG_GENERIC_HARDIRQS
 105
 106 #define get_irq_desc_chip(desc)         ((desc)->irq_data.chip)
 107 #define get_irq_desc_chip_data(desc)    ((desc)->irq_data.chip_data)
 108 #define get_irq_desc_data(desc)         ((desc)->irq_data.handler_data)
 109 #define get_irq_desc_msi(desc)          ((desc)->irq_data.msi_desc)
 110
 111 /*
 112  * Monolithic do_IRQ implementation.
 113  */
 114 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 115 extern unsigned int __do_IRQ(unsigned int irq);
 116 #endif
 117
 118 /*
 119  * Architectures call this to let the generic IRQ layer
 120  * handle an interrupt. If the descriptor is attached to an
 121  * irqchip-style controller then we call the ->handle_irq() handler,
 122  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 123  */
 124 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
 125 {
 126 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 127         desc->handle_irq(irq, desc);
 128 #else
 129         if (likely(desc->handle_irq))
 130                 desc->handle_irq(irq, desc);
 131         else
 132                 __do_IRQ(irq);
 133 #endif
 134 }
 135
 136 static inline void generic_handle_irq(unsigned int irq)
 137 {
 138         generic_handle_irq_desc(irq, irq_to_desc(irq));
 139 }
 140
 141 /* Test to see if a driver has successfully requested an irq */
 142 static inline int irq_has_action(unsigned int irq)
 143 {
 144         struct irq_desc *desc = irq_to_desc(irq);
 145         return desc->action != NULL;
 146 }
 147
 148 static inline int irq_balancing_disabled(unsigned int irq)
 149 {
 150         struct irq_desc *desc;
 151
 152         desc = irq_to_desc(irq);
 153         return desc->status & IRQ_NO_BALANCING_MASK;
 154 }
 155
 156 /* caller has locked the irq_desc and both params are valid */
 157 static inline void __set_irq_handler_unlocked(int irq,
 158                                               irq_flow_handler_t handler)
 159 {
 160         struct irq_desc *desc;
 161
 162         desc = irq_to_desc(irq);
 163         desc->handle_irq = handler;
 164 }
 165 #endif
 166
 167 #endif