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->state 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 #define irq_data_to_desc(data) container_of(data, struct irq_desc, irq_data) 63 64 extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, 65 unsigned long flags); 66 extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp); 67 extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume); 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 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr); 80 81 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action); 82 irqreturn_t handle_irq_event(struct irq_desc *desc); 83 84 /* Resending of interrupts :*/ 85 void check_irq_resend(struct irq_desc *desc, unsigned int irq); 86 bool irq_wait_for_poll(struct irq_desc *desc); 87 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action); 88 89 #ifdef CONFIG_PROC_FS 90 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); 91 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc); 92 extern void register_handler_proc(unsigned int irq, struct irqaction *action); 93 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action); 94 #else 95 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { } 96 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { } 97 static inline void register_handler_proc(unsigned int irq, 98 struct irqaction *action) { } 99 static inline void unregister_handler_proc(unsigned int irq, 100 struct irqaction *action) { } 101 #endif 102 103 extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask); 104 105 extern void irq_set_thread_affinity(struct irq_desc *desc); 106 107 extern int irq_do_set_affinity(struct irq_data *data, 108 const struct cpumask *dest, bool force); 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 #define _IRQ_DESC_CHECK (1 << 0) 124 #define _IRQ_DESC_PERCPU (1 << 1) 125 126 #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK) 127 #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU) 128 129 struct irq_desc * 130 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, 131 unsigned int check); 132 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus); 133 134 static inline struct irq_desc * 135 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check) 136 { 137 return __irq_get_desc_lock(irq, flags, true, check); 138 } 139 140 static inline void 141 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags) 142 { 143 __irq_put_desc_unlock(desc, flags, true); 144 } 145 146 static inline struct irq_desc * 147 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check) 148 { 149 return __irq_get_desc_lock(irq, flags, false, check); 150 } 151 152 static inline void 153 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags) 154 { 155 __irq_put_desc_unlock(desc, flags, false); 156 } 157 158 /* 159 * Manipulation functions for irq_data.state 160 */ 161 static inline void irqd_set_move_pending(struct irq_data *d) 162 { 163 d->state_use_accessors |= IRQD_SETAFFINITY_PENDING; 164 } 165 166 static inline void irqd_clr_move_pending(struct irq_data *d) 167 { 168 d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING; 169 } 170 171 static inline void irqd_clear(struct irq_data *d, unsigned int mask) 172 { 173 d->state_use_accessors &= ~mask; 174 } 175 176 static inline void irqd_set(struct irq_data *d, unsigned int mask) 177 { 178 d->state_use_accessors |= mask; 179 } 180 181 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) 182 { 183 return d->state_use_accessors & mask; 184 } 185 186 static inline void kstat_incr_irqs_this_cpu(unsigned int irq, struct irq_desc *desc) 187 { 188 __this_cpu_inc(*desc->kstat_irqs); 189 __this_cpu_inc(kstat.irqs_sum); 190 } 191