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 extern struct irqaction chained_action;
  22
  23 /*
  24  * Bits used by threaded handlers:
  25  * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
  26  * IRQTF_WARNED    - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
  27  * IRQTF_AFFINITY  - irq thread is requested to adjust affinity
  28  * IRQTF_FORCED_THREAD  - irq action is force threaded
  29  */
  30 enum {
  31         IRQTF_RUNTHREAD,
  32         IRQTF_WARNED,
  33         IRQTF_AFFINITY,
  34         IRQTF_FORCED_THREAD,
  35 };
  36
  37 /*
  38  * Bit masks for desc->core_internal_state__do_not_mess_with_it
  39  *
  40  * IRQS_AUTODETECT              - autodetection in progress
  41  * IRQS_SPURIOUS_DISABLED       - was disabled due to spurious interrupt
  42  *                                detection
  43  * IRQS_POLL_INPROGRESS         - polling in progress
  44  * IRQS_ONESHOT                 - irq is not unmasked in primary handler
  45  * IRQS_REPLAY                  - irq is replayed
  46  * IRQS_WAITING                 - irq is waiting
  47  * IRQS_PENDING                 - irq is pending and replayed later
  48  * IRQS_SUSPENDED               - irq is suspended
  49  */
  50 enum {
  51         IRQS_AUTODETECT         = 0x00000001,
  52         IRQS_SPURIOUS_DISABLED  = 0x00000002,
  53         IRQS_POLL_INPROGRESS    = 0x00000008,
  54         IRQS_ONESHOT            = 0x00000020,
  55         IRQS_REPLAY             = 0x00000040,
  56         IRQS_WAITING            = 0x00000080,
  57         IRQS_PENDING            = 0x00000200,
  58         IRQS_SUSPENDED          = 0x00000800,
  59 };
  60
  61 #include "debug.h"
  62 #include "settings.h"
  63
  64 extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
  65 extern void __disable_irq(struct irq_desc *desc);
  66 extern void __enable_irq(struct irq_desc *desc);
  67
  68 extern int irq_startup(struct irq_desc *desc, bool resend);
  69 extern void irq_shutdown(struct irq_desc *desc);
  70 extern void irq_enable(struct irq_desc *desc);
  71 extern void irq_disable(struct irq_desc *desc);
  72 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
  73 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
  74 extern void mask_irq(struct irq_desc *desc);
  75 extern void unmask_irq(struct irq_desc *desc);
  76 extern void unmask_threaded_irq(struct irq_desc *desc);
  77
  78 #ifdef CONFIG_SPARSE_IRQ
  79 static inline void irq_mark_irq(unsigned int irq) { }
  80 #else
  81 extern void irq_mark_irq(unsigned int irq);
  82 #endif
  83
  84 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
  85
  86 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
  87 irqreturn_t handle_irq_event(struct irq_desc *desc);
  88
  89 /* Resending of interrupts :*/
  90 void check_irq_resend(struct irq_desc *desc);
  91 bool irq_wait_for_poll(struct irq_desc *desc);
  92 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
  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 extern int irq_do_set_affinity(struct irq_data *data,
 113                                const struct cpumask *dest, bool force);
 114
 115 /* Inline functions for support of irq chips on slow busses */
 116 static inline void chip_bus_lock(struct irq_desc *desc)
 117 {
 118         if (unlikely(desc->irq_data.chip->irq_bus_lock))
 119                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
 120 }
 121
 122 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
 123 {
 124         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
 125                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
 126 }
 127
 128 #define _IRQ_DESC_CHECK         (1 << 0)
 129 #define _IRQ_DESC_PERCPU        (1 << 1)
 130
 131 #define IRQ_GET_DESC_CHECK_GLOBAL       (_IRQ_DESC_CHECK)
 132 #define IRQ_GET_DESC_CHECK_PERCPU       (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
 133
 134 #define for_each_action_of_desc(desc, act)                      \
 135         for (act = desc->act; act; act = act->next)
 136
 137 struct irq_desc *
 138 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
 139                     unsigned int check);
 140 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
 141
 142 static inline struct irq_desc *
 143 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
 144 {
 145         return __irq_get_desc_lock(irq, flags, true, check);
 146 }
 147
 148 static inline void
 149 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
 150 {
 151         __irq_put_desc_unlock(desc, flags, true);
 152 }
 153
 154 static inline struct irq_desc *
 155 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
 156 {
 157         return __irq_get_desc_lock(irq, flags, false, check);
 158 }
 159
 160 static inline void
 161 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
 162 {
 163         __irq_put_desc_unlock(desc, flags, false);
 164 }
 165
 166 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
 167
 168 /*
 169  * Manipulation functions for irq_data.state
 170  */
 171 static inline void irqd_set_move_pending(struct irq_data *d)
 172 {
 173         __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
 174 }
 175
 176 static inline void irqd_clr_move_pending(struct irq_data *d)
 177 {
 178         __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
 179 }
 180
 181 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
 182 {
 183         __irqd_to_state(d) &= ~mask;
 184 }
 185
 186 static inline void irqd_set(struct irq_data *d, unsigned int mask)
 187 {
 188         __irqd_to_state(d) |= mask;
 189 }
 190
 191 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
 192 {
 193         return __irqd_to_state(d) & mask;
 194 }
 195
 196 #undef __irqd_to_state
 197
 198 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
 199 {
 200         __this_cpu_inc(*desc->kstat_irqs);
 201         __this_cpu_inc(kstat.irqs_sum);
 202 }
 203
 204 static inline int irq_desc_get_node(struct irq_desc *desc)
 205 {
 206         return irq_common_data_get_node(&desc->irq_common_data);
 207 }
 208
 209 static inline int irq_desc_is_chained(struct irq_desc *desc)
 210 {
 211         return (desc->action && desc->action == &chained_action);
 212 }
 213
 214 #ifdef CONFIG_PM_SLEEP
 215 bool irq_pm_check_wakeup(struct irq_desc *desc);
 216 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
 217 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
 218 #else
 219 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
 220 static inline void
 221 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
 222 static inline void
 223 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
 224 #endif