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, bool resend);
  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 #ifdef CONFIG_SPARSE_IRQ
  80 extern void irq_lock_sparse(void);
  81 extern void irq_unlock_sparse(void);
  82 #else
  83 static inline void irq_lock_sparse(void) { }
  84 static inline void irq_unlock_sparse(void) { }
  85 #endif
  86 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
  87
  88 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action);
  89 irqreturn_t handle_irq_event(struct irq_desc *desc);
  90
  91 /* Resending of interrupts :*/
  92 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
  93 bool irq_wait_for_poll(struct irq_desc *desc);
  94
  95 #ifdef CONFIG_PROC_FS
  96 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
  97 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
  98 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
  99 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
 100 #else
 101 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 102 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 103 static inline void register_handler_proc(unsigned int irq,
 104                                          struct irqaction *action) { }
 105 static inline void unregister_handler_proc(unsigned int irq,
 106                                            struct irqaction *action) { }
 107 #endif
 108
 109 extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
 110
 111 extern void irq_set_thread_affinity(struct irq_desc *desc);
 112
 113 /* Inline functions for support of irq chips on slow busses */
 114 static inline void chip_bus_lock(struct irq_desc *desc)
 115 {
 116         if (unlikely(desc->irq_data.chip->irq_bus_lock))
 117                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
 118 }
 119
 120 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
 121 {
 122         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
 123                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
 124 }
 125
 126 #define _IRQ_DESC_CHECK         (1 << 0)
 127 #define _IRQ_DESC_PERCPU        (1 << 1)
 128
 129 #define IRQ_GET_DESC_CHECK_GLOBAL       (_IRQ_DESC_CHECK)
 130 #define IRQ_GET_DESC_CHECK_PERCPU       (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
 131
 132 struct irq_desc *
 133 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
 134                     unsigned int check);
 135 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
 136
 137 static inline struct irq_desc *
 138 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
 139 {
 140         return __irq_get_desc_lock(irq, flags, true, check);
 141 }
 142
 143 static inline void
 144 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
 145 {
 146         __irq_put_desc_unlock(desc, flags, true);
 147 }
 148
 149 static inline struct irq_desc *
 150 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
 151 {
 152         return __irq_get_desc_lock(irq, flags, false, check);
 153 }
 154
 155 static inline void
 156 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
 157 {
 158         __irq_put_desc_unlock(desc, flags, false);
 159 }
 160
 161 /*
 162  * Manipulation functions for irq_data.state
 163  */
 164 static inline void irqd_set_move_pending(struct irq_data *d)
 165 {
 166         d->state_use_accessors |= IRQD_SETAFFINITY_PENDING;
 167 }
 168
 169 static inline void irqd_clr_move_pending(struct irq_data *d)
 170 {
 171         d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING;
 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 }