LXR linux/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
  18extern bool 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 */
  28enum {
  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 */
  49enum {
  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
  65extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
  66                unsigned long flags);
  67extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
  68extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
  69
  70extern int irq_startup(struct irq_desc *desc, bool resend);
  71extern void irq_shutdown(struct irq_desc *desc);
  72extern void irq_enable(struct irq_desc *desc);
  73extern void irq_disable(struct irq_desc *desc);
  74extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
  75extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
  76extern void mask_irq(struct irq_desc *desc);
  77extern void unmask_irq(struct irq_desc *desc);
  78
  79extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
  80
  81irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action);
  82irqreturn_t handle_irq_event(struct irq_desc *desc);
  83
  84/* Resending of interrupts :*/
  85void check_irq_resend(struct irq_desc *desc, unsigned int irq);
  86bool irq_wait_for_poll(struct irq_desc *desc);
  87
  88#ifdef CONFIG_PROC_FS
  89extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
  90extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
  91extern void register_handler_proc(unsigned int irq, struct irqaction *action);
  92extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
  93#else
  94static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
  95static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
  96static inline void register_handler_proc(unsigned int irq,
  97                                         struct irqaction *action) { }
  98static inline void unregister_handler_proc(unsigned int irq,
  99                                           struct irqaction *action) { }
 100#endif
 101
 102extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
 103
 104extern void irq_set_thread_affinity(struct irq_desc *desc);
 105
 106/* Inline functions for support of irq chips on slow busses */
 107static inline void chip_bus_lock(struct irq_desc *desc)
 108{
 109        if (unlikely(desc->irq_data.chip->irq_bus_lock))
 110                desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
 111}
 112
 113static inline void chip_bus_sync_unlock(struct irq_desc *desc)
 114{
 115        if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
 116                desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
 117}
 118
 119#define _IRQ_DESC_CHECK         (1 << 0)
 120#define _IRQ_DESC_PERCPU        (1 << 1)
 121
 122#define IRQ_GET_DESC_CHECK_GLOBAL       (_IRQ_DESC_CHECK)
 123#define IRQ_GET_DESC_CHECK_PERCPU       (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
 124
 125struct irq_desc *
 126__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
 127                    unsigned int check);
 128void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
 129
 130static inline struct irq_desc *
 131irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
 132{
 133        return __irq_get_desc_lock(irq, flags, true, check);
 134}
 135
 136static inline void
 137irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
 138{
 139        __irq_put_desc_unlock(desc, flags, true);
 140}
 141
 142static inline struct irq_desc *
 143irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
 144{
 145        return __irq_get_desc_lock(irq, flags, false, check);
 146}
 147
 148static inline void
 149irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
 150{
 151        __irq_put_desc_unlock(desc, flags, false);
 152}
 153
 154/*
 155 * Manipulation functions for irq_data.state
 156 */
 157static inline void irqd_set_move_pending(struct irq_data *d)
 158{
 159        d->state_use_accessors |= IRQD_SETAFFINITY_PENDING;
 160}
 161
 162static inline void irqd_clr_move_pending(struct irq_data *d)
 163{
 164        d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING;
 165}
 166
 167static inline void irqd_clear(struct irq_data *d, unsigned int mask)
 168{
 169        d->state_use_accessors &= ~mask;
 170}
 171
 172static inline void irqd_set(struct irq_data *d, unsigned int mask)
 173{
 174        d->state_use_accessors |= mask;
 175}
 176
 177static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
 178{
 179        return d->state_use_accessors & mask;
 180}
 181