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 #include "compat.h"
  17 #include "settings.h"
  18
  19 #define istate core_internal_state__do_not_mess_with_it
  20
  21 extern int noirqdebug;
  22
  23 /*
  24  * Bits used by threaded handlers:
  25  * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
  26  * IRQTF_DIED      - handler thread died
  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  */
  30 enum {
  31         IRQTF_RUNTHREAD,
  32         IRQTF_DIED,
  33         IRQTF_WARNED,
  34         IRQTF_AFFINITY,
  35 };
  36
  37 /*
  38  * Bit masks for desc->state
  39  *
  40  * IRQS_AUTODETECT              - autodetection in progress
  41  * IRQS_SPURIOUS_DISABLED       - was disabled due to spurious interrupt
  42  *                                detection
  43  * IRQS_POLL_INPROGRESS         - polling in progress
  44  * IRQS_INPROGRESS              - Interrupt 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_DISABLED                - irq is disabled
  49  * IRQS_PENDING                 - irq is pending and replayed later
  50  * IRQS_MASKED                  - irq is masked
  51  */
  52 enum {
  53         IRQS_AUTODETECT         = 0x00000001,
  54         IRQS_SPURIOUS_DISABLED  = 0x00000002,
  55         IRQS_POLL_INPROGRESS    = 0x00000008,
  56         IRQS_INPROGRESS         = 0x00000010,
  57         IRQS_ONESHOT            = 0x00000020,
  58         IRQS_REPLAY             = 0x00000040,
  59         IRQS_WAITING            = 0x00000080,
  60         IRQS_DISABLED           = 0x00000100,
  61         IRQS_PENDING            = 0x00000200,
  62         IRQS_MASKED             = 0x00000400,
  63 };
  64
  65 #define irq_data_to_desc(data)  container_of(data, struct irq_desc, irq_data)
  66
  67 /* Set default functions for irq_chip structures: */
  68 extern void irq_chip_set_defaults(struct irq_chip *chip);
  69
  70 /* Set default handler: */
  71 extern void compat_irq_chip_set_default_handler(struct irq_desc *desc);
  72
  73 extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
  74                 unsigned long flags);
  75 extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
  76 extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
  77
  78 extern int irq_startup(struct irq_desc *desc);
  79 extern void irq_shutdown(struct irq_desc *desc);
  80 extern void irq_enable(struct irq_desc *desc);
  81 extern void irq_disable(struct irq_desc *desc);
  82
  83 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
  84
  85 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action);
  86 irqreturn_t handle_irq_event(struct irq_desc *desc);
  87
  88 /* Resending of interrupts :*/
  89 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
  90 bool irq_wait_for_poll(struct irq_desc *desc);
  91
  92 #ifdef CONFIG_PROC_FS
  93 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
  94 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
  95 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
  96 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
  97 #else
  98 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
  99 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 100 static inline void register_handler_proc(unsigned int irq,
 101                                          struct irqaction *action) { }
 102 static inline void unregister_handler_proc(unsigned int irq,
 103                                            struct irqaction *action) { }
 104 #endif
 105
 106 extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
 107
 108 extern void irq_set_thread_affinity(struct irq_desc *desc);
 109
 110 /* Inline functions for support of irq chips on slow busses */
 111 static inline void chip_bus_lock(struct irq_desc *desc)
 112 {
 113         if (unlikely(desc->irq_data.chip->irq_bus_lock))
 114                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
 115 }
 116
 117 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
 118 {
 119         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
 120                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
 121 }
 122
 123 /*
 124  * Debugging printout:
 125  */
 126
 127 #include <linux/kallsyms.h>
 128
 129 #define P(f) if (desc->status & f) printk("%14s set\n", #f)
 130 #define PS(f) if (desc->istate & f) printk("%14s set\n", #f)
 131
 132 static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc)
 133 {
 134         printk("irq %d, desc: %p, depth: %d, count: %d, unhandled: %d\n",
 135                 irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled);
 136         printk("->handle_irq():  %p, ", desc->handle_irq);
 137         print_symbol("%s\n", (unsigned long)desc->handle_irq);
 138         printk("->irq_data.chip(): %p, ", desc->irq_data.chip);
 139         print_symbol("%s\n", (unsigned long)desc->irq_data.chip);
 140         printk("->action(): %p\n", desc->action);
 141         if (desc->action) {
 142                 printk("->action->handler(): %p, ", desc->action->handler);
 143                 print_symbol("%s\n", (unsigned long)desc->action->handler);
 144         }
 145
 146         P(IRQ_LEVEL);
 147 #ifdef CONFIG_IRQ_PER_CPU
 148         P(IRQ_PER_CPU);
 149 #endif
 150         P(IRQ_NOPROBE);
 151         P(IRQ_NOREQUEST);
 152         P(IRQ_NOAUTOEN);
 153
 154         PS(IRQS_AUTODETECT);
 155         PS(IRQS_INPROGRESS);
 156         PS(IRQS_REPLAY);
 157         PS(IRQS_WAITING);
 158         PS(IRQS_DISABLED);
 159         PS(IRQS_PENDING);
 160         PS(IRQS_MASKED);
 161 }
 162
 163 #undef P
 164 #undef PS