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_WARNED    - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
  24 * IRQTF_AFFINITY  - irq thread is requested to adjust affinity
  25 * IRQTF_FORCED_THREAD  - irq action is force threaded
  26 */
  27enum {
  28        IRQTF_RUNTHREAD,
  29        IRQTF_WARNED,
  30        IRQTF_AFFINITY,
  31        IRQTF_FORCED_THREAD,
  32};
  33
  34/*
  35 * Bit masks for desc->state
  36 *
  37 * IRQS_AUTODETECT              - autodetection in progress
  38 * IRQS_SPURIOUS_DISABLED       - was disabled due to spurious interrupt
  39 *                                detection
  40 * IRQS_POLL_INPROGRESS         - polling in progress
  41 * IRQS_ONESHOT                 - irq is not unmasked in primary handler
  42 * IRQS_REPLAY                  - irq is replayed
  43 * IRQS_WAITING                 - irq is waiting
  44 * IRQS_PENDING                 - irq is pending and replayed later
  45 * IRQS_SUSPENDED               - irq is suspended
  46 */
  47enum {
  48        IRQS_AUTODETECT         = 0x00000001,
  49        IRQS_SPURIOUS_DISABLED  = 0x00000002,
  50        IRQS_POLL_INPROGRESS    = 0x00000008,
  51        IRQS_ONESHOT            = 0x00000020,
  52        IRQS_REPLAY             = 0x00000040,
  53        IRQS_WAITING            = 0x00000080,
  54        IRQS_PENDING            = 0x00000200,
  55        IRQS_SUSPENDED          = 0x00000800,
  56};
  57
  58#include "debug.h"
  59#include "settings.h"
  60
  61#define irq_data_to_desc(data)  container_of(data, struct irq_desc, irq_data)
  62
  63extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
  64                unsigned long flags);
  65extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
  66extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
  67
  68extern int irq_startup(struct irq_desc *desc, bool resend);
  69extern void irq_shutdown(struct irq_desc *desc);
  70extern void irq_enable(struct irq_desc *desc);
  71extern void irq_disable(struct irq_desc *desc);
  72extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
  73extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
  74extern void mask_irq(struct irq_desc *desc);
  75extern void unmask_irq(struct irq_desc *desc);
  76
  77extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
  78
  79irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action);
  80irqreturn_t handle_irq_event(struct irq_desc *desc);
  81
  82/* Resending of interrupts :*/
  83void check_irq_resend(struct irq_desc *desc, unsigned int irq);
  84bool irq_wait_for_poll(struct irq_desc *desc);
  85
  86#ifdef CONFIG_PROC_FS
  87extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
  88extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
  89extern void register_handler_proc(unsigned int irq, struct irqaction *action);
  90extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
  91#else
  92static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
  93static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
  94static inline void register_handler_proc(unsigned int irq,
  95                                         struct irqaction *action) { }
  96static inline void unregister_handler_proc(unsigned int irq,
  97                                           struct irqaction *action) { }
  98#endif
  99
 100extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
 101
 102extern void irq_set_thread_affinity(struct irq_desc *desc);
 103
 104extern int irq_do_set_affinity(struct irq_data *data,
 105                               const struct cpumask *dest, bool force);
 106
 107/* Inline functions for support of irq chips on slow busses */
 108static inline void chip_bus_lock(struct irq_desc *desc)
 109{
 110        if (unlikely(desc->irq_data.chip->irq_bus_lock))
 111                desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
 112}
 113
 114static inline void chip_bus_sync_unlock(struct irq_desc *desc)
 115{
 116        if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
 117                desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
 118}
 119
 120#define _IRQ_DESC_CHECK         (1 << 0)
 121#define _IRQ_DESC_PERCPU        (1 << 1)
 122
 123#define IRQ_GET_DESC_CHECK_GLOBAL       (_IRQ_DESC_CHECK)
 124#define IRQ_GET_DESC_CHECK_PERCPU       (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
 125
 126struct irq_desc *
 127__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
 128                    unsigned int check);
 129void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
 130
 131static inline struct irq_desc *
 132irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
 133{
 134        return __irq_get_desc_lock(irq, flags, true, check);
 135}
 136
 137static inline void
 138irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
 139{
 140        __irq_put_desc_unlock(desc, flags, true);
 141}
 142
 143static inline struct irq_desc *
 144irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
 145{
 146        return __irq_get_desc_lock(irq, flags, false, check);
 147}
 148
 149static inline void
 150irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
 151{
 152        __irq_put_desc_unlock(desc, flags, false);
 153}
 154
 155/*
 156 * Manipulation functions for irq_data.state
 157 */
 158static inline void irqd_set_move_pending(struct irq_data *d)
 159{
 160        d->state_use_accessors |= IRQD_SETAFFINITY_PENDING;
 161}
 162
 163static inline void irqd_clr_move_pending(struct irq_data *d)
 164{
 165        d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING;
 166}
 167
 168static inline void irqd_clear(struct irq_data *d, unsigned int mask)
 169{
 170        d->state_use_accessors &= ~mask;
 171}
 172
 173static inline void irqd_set(struct irq_data *d, unsigned int mask)
 174{
 175        d->state_use_accessors |= mask;
 176}
 177
 178static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
 179{
 180        return d->state_use_accessors & mask;
 181}
 182