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->core_internal_state__do_not_mess_with_it
  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);
  67 extern void __enable_irq(struct irq_desc *desc, unsigned int irq);
  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 #ifdef CONFIG_SPARSE_IRQ
  80 static inline void irq_mark_irq(unsigned int irq) { }
  81 extern void irq_lock_sparse(void);
  82 extern void irq_unlock_sparse(void);
  83 #else
  84 extern void irq_mark_irq(unsigned int irq);
  85 static inline void irq_lock_sparse(void) { }
  86 static inline void irq_unlock_sparse(void) { }
  87 #endif
  88
  89 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
  90
  91 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action);
  92 irqreturn_t handle_irq_event(struct irq_desc *desc);
  93
  94 /* Resending of interrupts :*/
  95 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
  96 bool irq_wait_for_poll(struct irq_desc *desc);
  97 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
  98
  99 #ifdef CONFIG_PROC_FS
 100 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
 101 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
 102 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
 103 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
 104 #else
 105 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 106 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 107 static inline void register_handler_proc(unsigned int irq,
 108                                          struct irqaction *action) { }
 109 static inline void unregister_handler_proc(unsigned int irq,
 110                                            struct irqaction *action) { }
 111 #endif
 112
 113 extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
 114
 115 extern void irq_set_thread_affinity(struct irq_desc *desc);
 116
 117 extern int irq_do_set_affinity(struct irq_data *data,
 118                                const struct cpumask *dest, bool force);
 119
 120 /* Inline functions for support of irq chips on slow busses */
 121 static inline void chip_bus_lock(struct irq_desc *desc)
 122 {
 123         if (unlikely(desc->irq_data.chip->irq_bus_lock))
 124                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
 125 }
 126
 127 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
 128 {
 129         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
 130                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
 131 }
 132
 133 #define _IRQ_DESC_CHECK         (1 << 0)
 134 #define _IRQ_DESC_PERCPU        (1 << 1)
 135
 136 #define IRQ_GET_DESC_CHECK_GLOBAL       (_IRQ_DESC_CHECK)
 137 #define IRQ_GET_DESC_CHECK_PERCPU       (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
 138
 139 struct irq_desc *
 140 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
 141                     unsigned int check);
 142 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
 143
 144 static inline struct irq_desc *
 145 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
 146 {
 147         return __irq_get_desc_lock(irq, flags, true, check);
 148 }
 149
 150 static inline void
 151 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
 152 {
 153         __irq_put_desc_unlock(desc, flags, true);
 154 }
 155
 156 static inline struct irq_desc *
 157 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
 158 {
 159         return __irq_get_desc_lock(irq, flags, false, check);
 160 }
 161
 162 static inline void
 163 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
 164 {
 165         __irq_put_desc_unlock(desc, flags, false);
 166 }
 167
 168 /*
 169  * Manipulation functions for irq_data.state
 170  */
 171 static inline void irqd_set_move_pending(struct irq_data *d)
 172 {
 173         d->state_use_accessors |= IRQD_SETAFFINITY_PENDING;
 174 }
 175
 176 static inline void irqd_clr_move_pending(struct irq_data *d)
 177 {
 178         d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING;
 179 }
 180
 181 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
 182 {
 183         d->state_use_accessors &= ~mask;
 184 }
 185
 186 static inline void irqd_set(struct irq_data *d, unsigned int mask)
 187 {
 188         d->state_use_accessors |= mask;
 189 }
 190
 191 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
 192 {
 193         return d->state_use_accessors & mask;
 194 }
 195
 196 static inline void kstat_incr_irqs_this_cpu(unsigned int irq, struct irq_desc *desc)
 197 {
 198         __this_cpu_inc(*desc->kstat_irqs);
 199         __this_cpu_inc(kstat.irqs_sum);
 200 }
 201
 202 #ifdef CONFIG_PM_SLEEP
 203 bool irq_pm_check_wakeup(struct irq_desc *desc);
 204 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
 205 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
 206 #else
 207 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
 208 static inline void
 209 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
 210 static inline void
 211 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
 212 #endif