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 #include <linux/pm_runtime.h>
  11
  12 #ifdef CONFIG_SPARSE_IRQ
  13 # define IRQ_BITMAP_BITS        (NR_IRQS + 8196)
  14 #else
  15 # define IRQ_BITMAP_BITS        NR_IRQS
  16 #endif
  17
  18 #define istate core_internal_state__do_not_mess_with_it
  19
  20 extern bool noirqdebug;
  21
  22 extern struct irqaction chained_action;
  23
  24 /*
  25  * Bits used by threaded handlers:
  26  * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
  27  * IRQTF_WARNED    - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
  28  * IRQTF_AFFINITY  - irq thread is requested to adjust affinity
  29  * IRQTF_FORCED_THREAD  - irq action is force threaded
  30  */
  31 enum {
  32         IRQTF_RUNTHREAD,
  33         IRQTF_WARNED,
  34         IRQTF_AFFINITY,
  35         IRQTF_FORCED_THREAD,
  36 };
  37
  38 /*
  39  * Bit masks for desc->core_internal_state__do_not_mess_with_it
  40  *
  41  * IRQS_AUTODETECT              - autodetection in progress
  42  * IRQS_SPURIOUS_DISABLED       - was disabled due to spurious interrupt
  43  *                                detection
  44  * IRQS_POLL_INPROGRESS         - polling in progress
  45  * IRQS_ONESHOT                 - irq is not unmasked in primary handler
  46  * IRQS_REPLAY                  - irq is replayed
  47  * IRQS_WAITING                 - irq is waiting
  48  * IRQS_PENDING                 - irq is pending and replayed later
  49  * IRQS_SUSPENDED               - irq is suspended
  50  */
  51 enum {
  52         IRQS_AUTODETECT         = 0x00000001,
  53         IRQS_SPURIOUS_DISABLED  = 0x00000002,
  54         IRQS_POLL_INPROGRESS    = 0x00000008,
  55         IRQS_ONESHOT            = 0x00000020,
  56         IRQS_REPLAY             = 0x00000040,
  57         IRQS_WAITING            = 0x00000080,
  58         IRQS_PENDING            = 0x00000200,
  59         IRQS_SUSPENDED          = 0x00000800,
  60 };
  61
  62 #include "debug.h"
  63 #include "settings.h"
  64
  65 extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
  66 extern void __disable_irq(struct irq_desc *desc);
  67 extern void __enable_irq(struct irq_desc *desc);
  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 #else
  82 extern void irq_mark_irq(unsigned int irq);
  83 #endif
  84
  85 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
  86
  87 irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags);
  88 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
  89 irqreturn_t handle_irq_event(struct irq_desc *desc);
  90
  91 /* Resending of interrupts :*/
  92 void check_irq_resend(struct irq_desc *desc);
  93 bool irq_wait_for_poll(struct irq_desc *desc);
  94 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
  95
  96 #ifdef CONFIG_PROC_FS
  97 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
  98 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
  99 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
 100 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
 101 #else
 102 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 103 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 104 static inline void register_handler_proc(unsigned int irq,
 105                                          struct irqaction *action) { }
 106 static inline void unregister_handler_proc(unsigned int irq,
 107                                            struct irqaction *action) { }
 108 #endif
 109
 110 extern bool irq_can_set_affinity_usr(unsigned int irq);
 111
 112 extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
 113
 114 extern void irq_set_thread_affinity(struct irq_desc *desc);
 115
 116 extern int irq_do_set_affinity(struct irq_data *data,
 117                                const struct cpumask *dest, bool force);
 118
 119 /* Inline functions for support of irq chips on slow busses */
 120 static inline void chip_bus_lock(struct irq_desc *desc)
 121 {
 122         if (unlikely(desc->irq_data.chip->irq_bus_lock))
 123                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
 124 }
 125
 126 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
 127 {
 128         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
 129                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
 130 }
 131
 132 #define _IRQ_DESC_CHECK         (1 << 0)
 133 #define _IRQ_DESC_PERCPU        (1 << 1)
 134
 135 #define IRQ_GET_DESC_CHECK_GLOBAL       (_IRQ_DESC_CHECK)
 136 #define IRQ_GET_DESC_CHECK_PERCPU       (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
 137
 138 #define for_each_action_of_desc(desc, act)                      \
 139         for (act = desc->act; act; act = act->next)
 140
 141 struct irq_desc *
 142 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
 143                     unsigned int check);
 144 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
 145
 146 static inline struct irq_desc *
 147 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
 148 {
 149         return __irq_get_desc_lock(irq, flags, true, check);
 150 }
 151
 152 static inline void
 153 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
 154 {
 155         __irq_put_desc_unlock(desc, flags, true);
 156 }
 157
 158 static inline struct irq_desc *
 159 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
 160 {
 161         return __irq_get_desc_lock(irq, flags, false, check);
 162 }
 163
 164 static inline void
 165 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
 166 {
 167         __irq_put_desc_unlock(desc, flags, false);
 168 }
 169
 170 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
 171
 172 /*
 173  * Manipulation functions for irq_data.state
 174  */
 175 static inline void irqd_set_move_pending(struct irq_data *d)
 176 {
 177         __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
 178 }
 179
 180 static inline void irqd_clr_move_pending(struct irq_data *d)
 181 {
 182         __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
 183 }
 184
 185 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
 186 {
 187         __irqd_to_state(d) &= ~mask;
 188 }
 189
 190 static inline void irqd_set(struct irq_data *d, unsigned int mask)
 191 {
 192         __irqd_to_state(d) |= mask;
 193 }
 194
 195 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
 196 {
 197         return __irqd_to_state(d) & mask;
 198 }
 199
 200 #undef __irqd_to_state
 201
 202 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
 203 {
 204         __this_cpu_inc(*desc->kstat_irqs);
 205         __this_cpu_inc(kstat.irqs_sum);
 206 }
 207
 208 static inline int irq_desc_get_node(struct irq_desc *desc)
 209 {
 210         return irq_common_data_get_node(&desc->irq_common_data);
 211 }
 212
 213 static inline int irq_desc_is_chained(struct irq_desc *desc)
 214 {
 215         return (desc->action && desc->action == &chained_action);
 216 }
 217
 218 #ifdef CONFIG_PM_SLEEP
 219 bool irq_pm_check_wakeup(struct irq_desc *desc);
 220 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
 221 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
 222 #else
 223 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
 224 static inline void
 225 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
 226 static inline void
 227 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
 228 #endif