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 #include <linux/kernel_stat.h>
  10
  11 #ifdef CONFIG_SPARSE_IRQ
  12 # define IRQ_BITMAP_BITS        (NR_IRQS + 8196)
  13 #else
  14 # define IRQ_BITMAP_BITS        NR_IRQS
  15 #endif
  16
  17 #define istate core_internal_state__do_not_mess_with_it
  18
  19 extern bool noirqdebug;
  20
  21 /*
  22  * Bits used by threaded handlers:
  23  * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
  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_WARNED,
  31         IRQTF_AFFINITY,
  32         IRQTF_FORCED_THREAD,
  33 };
  34
  35 /*
  36  * Bit masks for desc->state
  37  *
  38  * IRQS_AUTODETECT              - autodetection in progress
  39  * IRQS_SPURIOUS_DISABLED       - was disabled due to spurious interrupt
  40  *                                detection
  41  * IRQS_POLL_INPROGRESS         - polling in progress
  42  * IRQS_ONESHOT                 - irq is not unmasked in primary handler
  43  * IRQS_REPLAY                  - irq is replayed
  44  * IRQS_WAITING                 - irq is waiting
  45  * IRQS_PENDING                 - irq is pending and replayed later
  46  * IRQS_SUSPENDED               - irq is suspended
  47  */
  48 enum {
  49         IRQS_AUTODETECT         = 0x00000001,
  50         IRQS_SPURIOUS_DISABLED  = 0x00000002,
  51         IRQS_POLL_INPROGRESS    = 0x00000008,
  52         IRQS_ONESHOT            = 0x00000020,
  53         IRQS_REPLAY             = 0x00000040,
  54         IRQS_WAITING            = 0x00000080,
  55         IRQS_PENDING            = 0x00000200,
  56         IRQS_SUSPENDED          = 0x00000800,
  57 };
  58
  59 #include "debug.h"
  60 #include "settings.h"
  61
  62 #define irq_data_to_desc(data)  container_of(data, struct irq_desc, irq_data)
  63
  64 extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
  65                 unsigned long flags);
  66 extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
  67 extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
  68
  69 extern int irq_startup(struct irq_desc *desc, bool resend);
  70 extern void irq_shutdown(struct irq_desc *desc);
  71 extern void irq_enable(struct irq_desc *desc);
  72 extern void irq_disable(struct irq_desc *desc);
  73 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
  74 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
  75 extern void mask_irq(struct irq_desc *desc);
  76 extern void unmask_irq(struct irq_desc *desc);
  77 extern void unmask_threaded_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 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
  88
  89 #ifdef CONFIG_PROC_FS
  90 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
  91 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
  92 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
  93 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
  94 #else
  95 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
  96 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
  97 static inline void register_handler_proc(unsigned int irq,
  98                                          struct irqaction *action) { }
  99 static inline void unregister_handler_proc(unsigned int irq,
 100                                            struct irqaction *action) { }
 101 #endif
 102
 103 extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
 104
 105 extern void irq_set_thread_affinity(struct irq_desc *desc);
 106
 107 extern int irq_do_set_affinity(struct irq_data *data,
 108                                const struct cpumask *dest, bool force);
 109
 110 /* Inline functions for support of irq chips on slow busses */
 111 static inline void chip_bus_lock(struct irq_desc *desc)
 112 {
 113         if (unlikely(desc->irq_data.chip->irq_bus_lock))
 114                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
 115 }
 116
 117 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
 118 {
 119         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
 120                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
 121 }
 122
 123 #define _IRQ_DESC_CHECK         (1 << 0)
 124 #define _IRQ_DESC_PERCPU        (1 << 1)
 125
 126 #define IRQ_GET_DESC_CHECK_GLOBAL       (_IRQ_DESC_CHECK)
 127 #define IRQ_GET_DESC_CHECK_PERCPU       (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
 128
 129 struct irq_desc *
 130 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
 131                     unsigned int check);
 132 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
 133
 134 static inline struct irq_desc *
 135 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
 136 {
 137         return __irq_get_desc_lock(irq, flags, true, check);
 138 }
 139
 140 static inline void
 141 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
 142 {
 143         __irq_put_desc_unlock(desc, flags, true);
 144 }
 145
 146 static inline struct irq_desc *
 147 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
 148 {
 149         return __irq_get_desc_lock(irq, flags, false, check);
 150 }
 151
 152 static inline void
 153 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
 154 {
 155         __irq_put_desc_unlock(desc, flags, false);
 156 }
 157
 158 /*
 159  * Manipulation functions for irq_data.state
 160  */
 161 static inline void irqd_set_move_pending(struct irq_data *d)
 162 {
 163         d->state_use_accessors |= IRQD_SETAFFINITY_PENDING;
 164 }
 165
 166 static inline void irqd_clr_move_pending(struct irq_data *d)
 167 {
 168         d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING;
 169 }
 170
 171 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
 172 {
 173         d->state_use_accessors &= ~mask;
 174 }
 175
 176 static inline void irqd_set(struct irq_data *d, unsigned int mask)
 177 {
 178         d->state_use_accessors |= mask;
 179 }
 180
 181 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
 182 {
 183         return d->state_use_accessors & mask;
 184 }
 185
 186 static inline void kstat_incr_irqs_this_cpu(unsigned int irq, struct irq_desc *desc)
 187 {
 188         __this_cpu_inc(*desc->kstat_irqs);
 189         __this_cpu_inc(kstat.irqs_sum);
 190 }