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 extern struct irqaction chained_action; 22 23 /* 24 * Bits used by threaded handlers: 25 * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run 26 * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed 27 * IRQTF_AFFINITY - irq thread is requested to adjust affinity 28 * IRQTF_FORCED_THREAD - irq action is force threaded 29 */ 30 enum { 31 IRQTF_RUNTHREAD, 32 IRQTF_WARNED, 33 IRQTF_AFFINITY, 34 IRQTF_FORCED_THREAD, 35 }; 36 37 /* 38 * Bit masks for desc->core_internal_state__do_not_mess_with_it 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_ONESHOT - irq is not unmasked in primary handler 45 * IRQS_REPLAY - irq is replayed 46 * IRQS_WAITING - irq is waiting 47 * IRQS_PENDING - irq is pending and replayed later 48 * IRQS_SUSPENDED - irq is suspended 49 */ 50 enum { 51 IRQS_AUTODETECT = 0x00000001, 52 IRQS_SPURIOUS_DISABLED = 0x00000002, 53 IRQS_POLL_INPROGRESS = 0x00000008, 54 IRQS_ONESHOT = 0x00000020, 55 IRQS_REPLAY = 0x00000040, 56 IRQS_WAITING = 0x00000080, 57 IRQS_PENDING = 0x00000200, 58 IRQS_SUSPENDED = 0x00000800, 59 }; 60 61 #include "debug.h" 62 #include "settings.h" 63 64 extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags); 65 extern void __disable_irq(struct irq_desc *desc); 66 extern void __enable_irq(struct irq_desc *desc); 67 68 extern int irq_startup(struct irq_desc *desc, bool resend); 69 extern void irq_shutdown(struct irq_desc *desc); 70 extern void irq_enable(struct irq_desc *desc); 71 extern void irq_disable(struct irq_desc *desc); 72 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu); 73 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu); 74 extern void mask_irq(struct irq_desc *desc); 75 extern void unmask_irq(struct irq_desc *desc); 76 extern void unmask_threaded_irq(struct irq_desc *desc); 77 78 #ifdef CONFIG_SPARSE_IRQ 79 static inline void irq_mark_irq(unsigned int irq) { } 80 #else 81 extern void irq_mark_irq(unsigned int irq); 82 #endif 83 84 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr); 85 86 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc); 87 irqreturn_t handle_irq_event(struct irq_desc *desc); 88 89 /* Resending of interrupts :*/ 90 void check_irq_resend(struct irq_desc *desc); 91 bool irq_wait_for_poll(struct irq_desc *desc); 92 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action); 93 94 #ifdef CONFIG_PROC_FS 95 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); 96 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc); 97 extern void register_handler_proc(unsigned int irq, struct irqaction *action); 98 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action); 99 #else 100 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { } 101 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { } 102 static inline void register_handler_proc(unsigned int irq, 103 struct irqaction *action) { } 104 static inline void unregister_handler_proc(unsigned int irq, 105 struct irqaction *action) { } 106 #endif 107 108 extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask); 109 110 extern void irq_set_thread_affinity(struct irq_desc *desc); 111 112 extern int irq_do_set_affinity(struct irq_data *data, 113 const struct cpumask *dest, bool force); 114 115 /* Inline functions for support of irq chips on slow busses */ 116 static inline void chip_bus_lock(struct irq_desc *desc) 117 { 118 if (unlikely(desc->irq_data.chip->irq_bus_lock)) 119 desc->irq_data.chip->irq_bus_lock(&desc->irq_data); 120 } 121 122 static inline void chip_bus_sync_unlock(struct irq_desc *desc) 123 { 124 if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock)) 125 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data); 126 } 127 128 #define _IRQ_DESC_CHECK (1 << 0) 129 #define _IRQ_DESC_PERCPU (1 << 1) 130 131 #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK) 132 #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU) 133 134 struct irq_desc * 135 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, 136 unsigned int check); 137 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus); 138 139 static inline struct irq_desc * 140 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check) 141 { 142 return __irq_get_desc_lock(irq, flags, true, check); 143 } 144 145 static inline void 146 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags) 147 { 148 __irq_put_desc_unlock(desc, flags, true); 149 } 150 151 static inline struct irq_desc * 152 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check) 153 { 154 return __irq_get_desc_lock(irq, flags, false, check); 155 } 156 157 static inline void 158 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags) 159 { 160 __irq_put_desc_unlock(desc, flags, false); 161 } 162 163 /* 164 * Manipulation functions for irq_data.state 165 */ 166 static inline void irqd_set_move_pending(struct irq_data *d) 167 { 168 __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING; 169 } 170 171 static inline void irqd_clr_move_pending(struct irq_data *d) 172 { 173 __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING; 174 } 175 176 static inline void irqd_clear(struct irq_data *d, unsigned int mask) 177 { 178 __irqd_to_state(d) &= ~mask; 179 } 180 181 static inline void irqd_set(struct irq_data *d, unsigned int mask) 182 { 183 __irqd_to_state(d) |= mask; 184 } 185 186 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) 187 { 188 return __irqd_to_state(d) & mask; 189 } 190 191 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc) 192 { 193 __this_cpu_inc(*desc->kstat_irqs); 194 __this_cpu_inc(kstat.irqs_sum); 195 } 196 197 static inline int irq_desc_get_node(struct irq_desc *desc) 198 { 199 return irq_common_data_get_node(&desc->irq_common_data); 200 } 201 202 static inline int irq_desc_is_chained(struct irq_desc *desc) 203 { 204 return (desc->action && desc->action == &chained_action); 205 } 206 207 #ifdef CONFIG_PM_SLEEP 208 bool irq_pm_check_wakeup(struct irq_desc *desc); 209 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action); 210 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action); 211 #else 212 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; } 213 static inline void 214 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { } 215 static inline void 216 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { } 217 #endif 218