kernel/irq/internals.h

   1 /*
   2  * IRQ subsystem internal functions and variables:
   3  *
   4  * Do not ever include this file from anything else than
   5  * kernel/irq/. Do not even think about using any information outside
   6  * of this file for your non core code.
   7  */
   8 #include <linux/irqdesc.h>
   9
  10 #ifdef CONFIG_SPARSE_IRQ
  11 # define IRQ_BITMAP_BITS        (NR_IRQS + 8196)
  12 #else
  13 # define IRQ_BITMAP_BITS        NR_IRQS
  14 #endif
  15
  16 #define istate core_internal_state__do_not_mess_with_it
  17
  18 #ifdef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
  19 # define status status_use_accessors
  20 #endif
  21
  22 extern int noirqdebug;
  23
  24 /*
  25  * Bits used by threaded handlers:
  26  * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
  27  * IRQTF_DIED      - handler thread died
  28  * IRQTF_WARNED    - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
  29  * IRQTF_AFFINITY  - irq thread is requested to adjust affinity
  30  * IRQTF_FORCED_THREAD  - irq action is force threaded
  31  */
  32 enum {
  33         IRQTF_RUNTHREAD,
  34         IRQTF_DIED,
  35         IRQTF_WARNED,
  36         IRQTF_AFFINITY,
  37         IRQTF_FORCED_THREAD,
  38 };
  39
  40 /*
  41  * Bit masks for desc->state
  42  *
  43  * IRQS_AUTODETECT              - autodetection in progress
  44  * IRQS_SPURIOUS_DISABLED       - was disabled due to spurious interrupt
  45  *                                detection
  46  * IRQS_POLL_INPROGRESS         - polling in progress
  47  * IRQS_ONESHOT                 - irq is not unmasked in primary handler
  48  * IRQS_REPLAY                  - irq is replayed
  49  * IRQS_WAITING                 - irq is waiting
  50  * IRQS_PENDING                 - irq is pending and replayed later
  51  * IRQS_SUSPENDED               - irq is suspended
  52  */
  53 enum {
  54         IRQS_AUTODETECT         = 0x00000001,
  55         IRQS_SPURIOUS_DISABLED  = 0x00000002,
  56         IRQS_POLL_INPROGRESS    = 0x00000008,
  57         IRQS_ONESHOT            = 0x00000020,
  58         IRQS_REPLAY             = 0x00000040,
  59         IRQS_WAITING            = 0x00000080,
  60         IRQS_PENDING            = 0x00000200,
  61         IRQS_SUSPENDED          = 0x00000800,
  62 };
  63
  64 #include "compat.h"
  65 #include "debug.h"
  66 #include "settings.h"
  67
  68 #define irq_data_to_desc(data)  container_of(data, struct irq_desc, irq_data)
  69
  70 /* Set default functions for irq_chip structures: */
  71 extern void irq_chip_set_defaults(struct irq_chip *chip);
  72
  73 extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
  74                 unsigned long flags);
  75 extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
  76 extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
  77
  78 extern int irq_startup(struct irq_desc *desc);
  79 extern void irq_shutdown(struct irq_desc *desc);
  80 extern void irq_enable(struct irq_desc *desc);
  81 extern void irq_disable(struct irq_desc *desc);
  82 extern void mask_irq(struct irq_desc *desc);
  83 extern void unmask_irq(struct irq_desc *desc);
  84
  85 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
  86
  87 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action);
  88 irqreturn_t handle_irq_event(struct irq_desc *desc);
  89
  90 /* Resending of interrupts :*/
  91 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
  92 bool irq_wait_for_poll(struct irq_desc *desc);
  93
  94 #ifdef CONFIG_PROC_FS
  95 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
  96 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
  97 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
  98 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
  99 #else
 100 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 101 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 102 static inline void register_handler_proc(unsigned int irq,
 103                                          struct irqaction *action) { }
 104 static inline void unregister_handler_proc(unsigned int irq,
 105                                            struct irqaction *action) { }
 106 #endif
 107
 108 extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
 109
 110 extern void irq_set_thread_affinity(struct irq_desc *desc);
 111
 112 /* Inline functions for support of irq chips on slow busses */
 113 static inline void chip_bus_lock(struct irq_desc *desc)
 114 {
 115         if (unlikely(desc->irq_data.chip->irq_bus_lock))
 116                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
 117 }
 118
 119 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
 120 {
 121         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
 122                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
 123 }
 124
 125 struct irq_desc *
 126 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus);
 127 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
 128
 129 static inline struct irq_desc *
 130 irq_get_desc_buslock(unsigned int irq, unsigned long *flags)
 131 {
 132         return __irq_get_desc_lock(irq, flags, true);
 133 }
 134
 135 static inline void
 136 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
 137 {
 138         __irq_put_desc_unlock(desc, flags, true);
 139 }
 140
 141 static inline struct irq_desc *
 142 irq_get_desc_lock(unsigned int irq, unsigned long *flags)
 143 {
 144         return __irq_get_desc_lock(irq, flags, false);
 145 }
 146
 147 static inline void
 148 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
 149 {
 150         __irq_put_desc_unlock(desc, flags, false);
 151 }
 152
 153 /*
 154  * Manipulation functions for irq_data.state
 155  */
 156 static inline void irqd_set_move_pending(struct irq_data *d)
 157 {
 158         d->state_use_accessors |= IRQD_SETAFFINITY_PENDING;
 159         irq_compat_set_move_pending(irq_data_to_desc(d));
 160 }
 161
 162 static inline void irqd_clr_move_pending(struct irq_data *d)
 163 {
 164         d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING;
 165         irq_compat_clr_move_pending(irq_data_to_desc(d));
 166 }
 167
 168 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
 169 {
 170         d->state_use_accessors &= ~mask;
 171 }
 172
 173 static inline void irqd_set(struct irq_data *d, unsigned int mask)
 174 {
 175         d->state_use_accessors |= mask;
 176 }
 177
 178 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
 179 {
 180         return d->state_use_accessors & mask;
 181 }