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_INPROGRESS              - Interrupt in progress
  48  * IRQS_ONESHOT                 - irq is not unmasked in primary handler
  49  * IRQS_REPLAY                  - irq is replayed
  50  * IRQS_WAITING                 - irq is waiting
  51  * IRQS_DISABLED                - irq is disabled
  52  * IRQS_PENDING                 - irq is pending and replayed later
  53  * IRQS_MASKED                  - irq is masked
  54  * IRQS_SUSPENDED               - irq is suspended
  55  */
  56 enum {
  57         IRQS_AUTODETECT         = 0x00000001,
  58         IRQS_SPURIOUS_DISABLED  = 0x00000002,
  59         IRQS_POLL_INPROGRESS    = 0x00000008,
  60         IRQS_INPROGRESS         = 0x00000010,
  61         IRQS_ONESHOT            = 0x00000020,
  62         IRQS_REPLAY             = 0x00000040,
  63         IRQS_WAITING            = 0x00000080,
  64         IRQS_DISABLED           = 0x00000100,
  65         IRQS_PENDING            = 0x00000200,
  66         IRQS_MASKED             = 0x00000400,
  67         IRQS_SUSPENDED          = 0x00000800,
  68 };
  69
  70 #include "compat.h"
  71 #include "debug.h"
  72 #include "settings.h"
  73
  74 #define irq_data_to_desc(data)  container_of(data, struct irq_desc, irq_data)
  75
  76 /* Set default functions for irq_chip structures: */
  77 extern void irq_chip_set_defaults(struct irq_chip *chip);
  78
  79 extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
  80                 unsigned long flags);
  81 extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
  82 extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
  83
  84 extern int irq_startup(struct irq_desc *desc);
  85 extern void irq_shutdown(struct irq_desc *desc);
  86 extern void irq_enable(struct irq_desc *desc);
  87 extern void irq_disable(struct irq_desc *desc);
  88 extern void mask_irq(struct irq_desc *desc);
  89 extern void unmask_irq(struct irq_desc *desc);
  90
  91 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
  92
  93 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action);
  94 irqreturn_t handle_irq_event(struct irq_desc *desc);
  95
  96 /* Resending of interrupts :*/
  97 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
  98 bool irq_wait_for_poll(struct irq_desc *desc);
  99
 100 #ifdef CONFIG_PROC_FS
 101 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
 102 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
 103 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
 104 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
 105 #else
 106 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 107 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 108 static inline void register_handler_proc(unsigned int irq,
 109                                          struct irqaction *action) { }
 110 static inline void unregister_handler_proc(unsigned int irq,
 111                                            struct irqaction *action) { }
 112 #endif
 113
 114 extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
 115
 116 extern void irq_set_thread_affinity(struct irq_desc *desc);
 117
 118 /* Inline functions for support of irq chips on slow busses */
 119 static inline void chip_bus_lock(struct irq_desc *desc)
 120 {
 121         if (unlikely(desc->irq_data.chip->irq_bus_lock))
 122                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
 123 }
 124
 125 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
 126 {
 127         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
 128                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
 129 }
 130
 131 struct irq_desc *
 132 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus);
 133 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
 134
 135 static inline struct irq_desc *
 136 irq_get_desc_buslock(unsigned int irq, unsigned long *flags)
 137 {
 138         return __irq_get_desc_lock(irq, flags, true);
 139 }
 140
 141 static inline void
 142 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
 143 {
 144         __irq_put_desc_unlock(desc, flags, true);
 145 }
 146
 147 static inline struct irq_desc *
 148 irq_get_desc_lock(unsigned int irq, unsigned long *flags)
 149 {
 150         return __irq_get_desc_lock(irq, flags, false);
 151 }
 152
 153 static inline void
 154 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
 155 {
 156         __irq_put_desc_unlock(desc, flags, false);
 157 }
 158
 159 /*
 160  * Manipulation functions for irq_data.state
 161  */
 162 static inline void irqd_set_move_pending(struct irq_data *d)
 163 {
 164         d->state_use_accessors |= IRQD_SETAFFINITY_PENDING;
 165         irq_compat_set_move_pending(irq_data_to_desc(d));
 166 }
 167
 168 static inline void irqd_clr_move_pending(struct irq_data *d)
 169 {
 170         d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING;
 171         irq_compat_clr_move_pending(irq_data_to_desc(d));
 172 }
 173
 174 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
 175 {
 176         d->state_use_accessors &= ~mask;
 177 }
 178
 179 static inline void irqd_set(struct irq_data *d, unsigned int mask)
 180 {
 181         d->state_use_accessors |= mask;
 182 }
 183
 184 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
 185 {
 186         return d->state_use_accessors & mask;
 187 }