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