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 extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
  63                 unsigned long flags);
  64 extern void __disable_irq(struct irq_desc *desc, unsigned int irq);
  65 extern void __enable_irq(struct irq_desc *desc, unsigned int irq);
  66
  67 extern int irq_startup(struct irq_desc *desc, bool resend);
  68 extern void irq_shutdown(struct irq_desc *desc);
  69 extern void irq_enable(struct irq_desc *desc);
  70 extern void irq_disable(struct irq_desc *desc);
  71 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
  72 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
  73 extern void mask_irq(struct irq_desc *desc);
  74 extern void unmask_irq(struct irq_desc *desc);
  75 extern void unmask_threaded_irq(struct irq_desc *desc);
  76
  77 #ifdef CONFIG_SPARSE_IRQ
  78 static inline void irq_mark_irq(unsigned int irq) { }
  79 extern void irq_lock_sparse(void);
  80 extern void irq_unlock_sparse(void);
  81 #else
  82 extern void irq_mark_irq(unsigned int irq);
  83 static inline void irq_lock_sparse(void) { }
  84 static inline void irq_unlock_sparse(void) { }
  85 #endif
  86
  87 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
  88
  89 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action);
  90 irqreturn_t handle_irq_event(struct irq_desc *desc);
  91
  92 /* Resending of interrupts :*/
  93 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
  94 bool irq_wait_for_poll(struct irq_desc *desc);
  95 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
  96
  97 #ifdef CONFIG_PROC_FS
  98 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
  99 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
 100 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
 101 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
 102 #else
 103 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 104 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 105 static inline void register_handler_proc(unsigned int irq,
 106                                          struct irqaction *action) { }
 107 static inline void unregister_handler_proc(unsigned int irq,
 108                                            struct irqaction *action) { }
 109 #endif
 110
 111 extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
 112
 113 extern void irq_set_thread_affinity(struct irq_desc *desc);
 114
 115 extern int irq_do_set_affinity(struct irq_data *data,
 116                                const struct cpumask *dest, bool force);
 117
 118 /* Inline functions for support of irq chips on slow busses */
 119 static inline void chip_bus_lock(struct irq_desc *desc)
 120 {
 121         if (unlikely(desc->irq_data.chip->irq_bus_lock))
 122                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
 123 }
 124
 125 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
 126 {
 127         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
 128                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
 129 }
 130
 131 #define _IRQ_DESC_CHECK         (1 << 0)
 132 #define _IRQ_DESC_PERCPU        (1 << 1)
 133
 134 #define IRQ_GET_DESC_CHECK_GLOBAL       (_IRQ_DESC_CHECK)
 135 #define IRQ_GET_DESC_CHECK_PERCPU       (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
 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 /*
 167  * Manipulation functions for irq_data.state
 168  */
 169 static inline void irqd_set_move_pending(struct irq_data *d)
 170 {
 171         __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
 172 }
 173
 174 static inline void irqd_clr_move_pending(struct irq_data *d)
 175 {
 176         __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
 177 }
 178
 179 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
 180 {
 181         __irqd_to_state(d) &= ~mask;
 182 }
 183
 184 static inline void irqd_set(struct irq_data *d, unsigned int mask)
 185 {
 186         __irqd_to_state(d) |= mask;
 187 }
 188
 189 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
 190 {
 191         return __irqd_to_state(d) & mask;
 192 }
 193
 194 static inline void kstat_incr_irqs_this_cpu(unsigned int irq, struct irq_desc *desc)
 195 {
 196         __this_cpu_inc(*desc->kstat_irqs);
 197         __this_cpu_inc(kstat.irqs_sum);
 198 }
 199
 200 static inline int irq_desc_get_node(struct irq_desc *desc)
 201 {
 202         return irq_data_get_node(&desc->irq_data);
 203 }
 204
 205 #ifdef CONFIG_PM_SLEEP
 206 bool irq_pm_check_wakeup(struct irq_desc *desc);
 207 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
 208 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
 209 #else
 210 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
 211 static inline void
 212 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
 213 static inline void
 214 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
 215 #endif