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 #include <linux/pm_runtime.h> 11 12 #ifdef CONFIG_SPARSE_IRQ 13 # define IRQ_BITMAP_BITS (NR_IRQS + 8196) 14 #else 15 # define IRQ_BITMAP_BITS NR_IRQS 16 #endif 17 18 #define istate core_internal_state__do_not_mess_with_it 19 20 extern bool noirqdebug; 21 22 extern struct irqaction chained_action; 23 24 /* 25 * Bits used by threaded handlers: 26 * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run 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 * IRQTF_FORCED_THREAD - irq action is force threaded 30 */ 31 enum { 32 IRQTF_RUNTHREAD, 33 IRQTF_WARNED, 34 IRQTF_AFFINITY, 35 IRQTF_FORCED_THREAD, 36 }; 37 38 /* 39 * Bit masks for desc->core_internal_state__do_not_mess_with_it 40 * 41 * IRQS_AUTODETECT - autodetection in progress 42 * IRQS_SPURIOUS_DISABLED - was disabled due to spurious interrupt 43 * detection 44 * IRQS_POLL_INPROGRESS - polling 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_PENDING - irq is pending and replayed later 49 * IRQS_SUSPENDED - irq is suspended 50 */ 51 enum { 52 IRQS_AUTODETECT = 0x00000001, 53 IRQS_SPURIOUS_DISABLED = 0x00000002, 54 IRQS_POLL_INPROGRESS = 0x00000008, 55 IRQS_ONESHOT = 0x00000020, 56 IRQS_REPLAY = 0x00000040, 57 IRQS_WAITING = 0x00000080, 58 IRQS_PENDING = 0x00000200, 59 IRQS_SUSPENDED = 0x00000800, 60 }; 61 62 #include "debug.h" 63 #include "settings.h" 64 65 extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags); 66 extern void __disable_irq(struct irq_desc *desc); 67 extern void __enable_irq(struct irq_desc *desc); 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 #ifdef CONFIG_SPARSE_IRQ 80 static inline void irq_mark_irq(unsigned int irq) { } 81 #else 82 extern void irq_mark_irq(unsigned int irq); 83 #endif 84 85 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr); 86 87 irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags); 88 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc); 89 irqreturn_t handle_irq_event(struct irq_desc *desc); 90 91 /* Resending of interrupts :*/ 92 void check_irq_resend(struct irq_desc *desc); 93 bool irq_wait_for_poll(struct irq_desc *desc); 94 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action); 95 96 #ifdef CONFIG_PROC_FS 97 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); 98 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc); 99 extern void register_handler_proc(unsigned int irq, struct irqaction *action); 100 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action); 101 #else 102 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { } 103 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { } 104 static inline void register_handler_proc(unsigned int irq, 105 struct irqaction *action) { } 106 static inline void unregister_handler_proc(unsigned int irq, 107 struct irqaction *action) { } 108 #endif 109 110 extern bool irq_can_set_affinity_usr(unsigned int irq); 111 112 extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask); 113 114 extern void irq_set_thread_affinity(struct irq_desc *desc); 115 116 extern int irq_do_set_affinity(struct irq_data *data, 117 const struct cpumask *dest, bool force); 118 119 /* Inline functions for support of irq chips on slow busses */ 120 static inline void chip_bus_lock(struct irq_desc *desc) 121 { 122 if (unlikely(desc->irq_data.chip->irq_bus_lock)) 123 desc->irq_data.chip->irq_bus_lock(&desc->irq_data); 124 } 125 126 static inline void chip_bus_sync_unlock(struct irq_desc *desc) 127 { 128 if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock)) 129 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data); 130 } 131 132 #define _IRQ_DESC_CHECK (1 << 0) 133 #define _IRQ_DESC_PERCPU (1 << 1) 134 135 #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK) 136 #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU) 137 138 #define for_each_action_of_desc(desc, act) \ 139 for (act = desc->act; act; act = act->next) 140 141 struct irq_desc * 142 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, 143 unsigned int check); 144 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus); 145 146 static inline struct irq_desc * 147 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check) 148 { 149 return __irq_get_desc_lock(irq, flags, true, check); 150 } 151 152 static inline void 153 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags) 154 { 155 __irq_put_desc_unlock(desc, flags, true); 156 } 157 158 static inline struct irq_desc * 159 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check) 160 { 161 return __irq_get_desc_lock(irq, flags, false, check); 162 } 163 164 static inline void 165 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags) 166 { 167 __irq_put_desc_unlock(desc, flags, false); 168 } 169 170 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors) 171 172 static inline unsigned int irqd_get(struct irq_data *d) 173 { 174 return __irqd_to_state(d); 175 } 176 177 /* 178 * Manipulation functions for irq_data.state 179 */ 180 static inline void irqd_set_move_pending(struct irq_data *d) 181 { 182 __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING; 183 } 184 185 static inline void irqd_clr_move_pending(struct irq_data *d) 186 { 187 __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING; 188 } 189 190 static inline void irqd_clear(struct irq_data *d, unsigned int mask) 191 { 192 __irqd_to_state(d) &= ~mask; 193 } 194 195 static inline void irqd_set(struct irq_data *d, unsigned int mask) 196 { 197 __irqd_to_state(d) |= mask; 198 } 199 200 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) 201 { 202 return __irqd_to_state(d) & mask; 203 } 204 205 #undef __irqd_to_state 206 207 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc) 208 { 209 __this_cpu_inc(*desc->kstat_irqs); 210 __this_cpu_inc(kstat.irqs_sum); 211 } 212 213 static inline int irq_desc_get_node(struct irq_desc *desc) 214 { 215 return irq_common_data_get_node(&desc->irq_common_data); 216 } 217 218 static inline int irq_desc_is_chained(struct irq_desc *desc) 219 { 220 return (desc->action && desc->action == &chained_action); 221 } 222 223 #ifdef CONFIG_PM_SLEEP 224 bool irq_pm_check_wakeup(struct irq_desc *desc); 225 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action); 226 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action); 227 #else 228 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; } 229 static inline void 230 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { } 231 static inline void 232 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { } 233 #endif 234 235 #ifdef CONFIG_GENERIC_IRQ_CHIP 236 void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, 237 int num_ct, unsigned int irq_base, 238 void __iomem *reg_base, irq_flow_handler_t handler); 239 #else 240 static inline void 241 irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, 242 int num_ct, unsigned int irq_base, 243 void __iomem *reg_base, irq_flow_handler_t handler) { } 244 #endif /* CONFIG_GENERIC_IRQ_CHIP */ 245 246 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS 247 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc); 248 void irq_remove_debugfs_entry(struct irq_desc *desc); 249 # ifdef CONFIG_IRQ_DOMAIN 250 void irq_domain_debugfs_init(struct dentry *root); 251 # else 252 static inline void irq_domain_debugfs_init(struct dentry *root); 253 # endif 254 #else /* CONFIG_GENERIC_IRQ_DEBUGFS */ 255 static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d) 256 { 257 } 258 static inline void irq_remove_debugfs_entry(struct irq_desc *d) 259 { 260 } 261 #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */ 262