1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * IRQ subsystem internal functions and variables: 4 * 5 * Do not ever include this file from anything else than 6 * kernel/irq/. Do not even think about using any information outside 7 * of this file for your non core code. 8 */ 9 #include <linux/irqdesc.h> 10 #include <linux/kernel_stat.h> 11 #include <linux/pm_runtime.h> 12 #include <linux/sched/clock.h> 13 14 #ifdef CONFIG_SPARSE_IRQ 15 # define MAX_SPARSE_IRQS INT_MAX 16 #else 17 # define MAX_SPARSE_IRQS NR_IRQS 18 #endif 19 20 #define istate core_internal_state__do_not_mess_with_it 21 22 extern bool noirqdebug; 23 extern int irq_poll_cpu; 24 25 extern struct irqaction chained_action; 26 27 /* 28 * Bits used by threaded handlers: 29 * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run 30 * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed 31 * IRQTF_AFFINITY - irq thread is requested to adjust affinity 32 * IRQTF_FORCED_THREAD - irq action is force threaded 33 * IRQTF_READY - signals that irq thread is ready 34 */ 35 enum { 36 IRQTF_RUNTHREAD, 37 IRQTF_WARNED, 38 IRQTF_AFFINITY, 39 IRQTF_FORCED_THREAD, 40 IRQTF_READY, 41 }; 42 43 /* 44 * Bit masks for desc->core_internal_state__do_not_mess_with_it 45 * 46 * IRQS_AUTODETECT - autodetection in progress 47 * IRQS_SPURIOUS_DISABLED - was disabled due to spurious interrupt 48 * detection 49 * IRQS_POLL_INPROGRESS - polling in progress 50 * IRQS_ONESHOT - irq is not unmasked in primary handler 51 * IRQS_REPLAY - irq has been resent and will not be resent 52 * again until the handler has run and cleared 53 * this flag. 54 * IRQS_WAITING - irq is waiting 55 * IRQS_PENDING - irq needs to be resent and should be resent 56 * at the next available opportunity. 57 * IRQS_SUSPENDED - irq is suspended 58 * IRQS_NMI - irq line is used to deliver NMIs 59 * IRQS_SYSFS - descriptor has been added to sysfs 60 */ 61 enum { 62 IRQS_AUTODETECT = 0x00000001, 63 IRQS_SPURIOUS_DISABLED = 0x00000002, 64 IRQS_POLL_INPROGRESS = 0x00000008, 65 IRQS_ONESHOT = 0x00000020, 66 IRQS_REPLAY = 0x00000040, 67 IRQS_WAITING = 0x00000080, 68 IRQS_PENDING = 0x00000200, 69 IRQS_SUSPENDED = 0x00000800, 70 IRQS_TIMINGS = 0x00001000, 71 IRQS_NMI = 0x00002000, 72 IRQS_SYSFS = 0x00004000, 73 }; 74 75 #include "debug.h" 76 #include "settings.h" 77 78 extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags); 79 extern void __disable_irq(struct irq_desc *desc); 80 extern void __enable_irq(struct irq_desc *desc); 81 82 #define IRQ_RESEND true 83 #define IRQ_NORESEND false 84 85 #define IRQ_START_FORCE true 86 #define IRQ_START_COND false 87 88 extern int irq_activate(struct irq_desc *desc); 89 extern int irq_activate_and_startup(struct irq_desc *desc, bool resend); 90 extern int irq_startup(struct irq_desc *desc, bool resend, bool force); 91 extern void irq_startup_managed(struct irq_desc *desc); 92 93 extern void irq_shutdown(struct irq_desc *desc); 94 extern void irq_shutdown_and_deactivate(struct irq_desc *desc); 95 extern void irq_disable(struct irq_desc *desc); 96 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu); 97 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu); 98 extern void mask_irq(struct irq_desc *desc); 99 extern void unmask_irq(struct irq_desc *desc); 100 extern void unmask_threaded_irq(struct irq_desc *desc); 101 102 #ifdef CONFIG_SPARSE_IRQ 103 static inline void irq_mark_irq(unsigned int irq) { } 104 #else 105 extern void irq_mark_irq(unsigned int irq); 106 #endif 107 108 irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc); 109 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc); 110 irqreturn_t handle_irq_event(struct irq_desc *desc); 111 112 /* Resending of interrupts :*/ 113 int check_irq_resend(struct irq_desc *desc, bool inject); 114 void clear_irq_resend(struct irq_desc *desc); 115 void irq_resend_init(struct irq_desc *desc); 116 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action); 117 118 void wake_threads_waitq(struct irq_desc *desc); 119 120 #ifdef CONFIG_PROC_FS 121 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); 122 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc); 123 extern void register_handler_proc(unsigned int irq, struct irqaction *action); 124 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action); 125 #else 126 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { } 127 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { } 128 static inline void register_handler_proc(unsigned int irq, 129 struct irqaction *action) { } 130 static inline void unregister_handler_proc(unsigned int irq, 131 struct irqaction *action) { } 132 #endif 133 134 extern bool irq_can_set_affinity_usr(unsigned int irq); 135 136 extern int irq_do_set_affinity(struct irq_data *data, 137 const struct cpumask *dest, bool force); 138 extern void irq_affinity_schedule_notify_work(struct irq_desc *desc); 139 140 #ifdef CONFIG_SMP 141 extern int irq_setup_affinity(struct irq_desc *desc); 142 #else 143 static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; } 144 #endif 145 146 #define for_each_action_of_desc(desc, act) \ 147 for (act = desc->action; act; act = act->next) 148 149 /* Inline functions for support of irq chips on slow busses */ 150 static inline void chip_bus_lock(struct irq_desc *desc) 151 { 152 if (unlikely(desc->irq_data.chip->irq_bus_lock)) 153 desc->irq_data.chip->irq_bus_lock(&desc->irq_data); 154 } 155 156 static inline void chip_bus_sync_unlock(struct irq_desc *desc) 157 { 158 if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock)) 159 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data); 160 } 161 162 #define _IRQ_DESC_CHECK (1 << 0) 163 #define _IRQ_DESC_PERCPU (1 << 1) 164 165 #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK) 166 #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU) 167 168 struct irq_desc *__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, 169 unsigned int check); 170 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus); 171 172 __DEFINE_CLASS_IS_CONDITIONAL(irqdesc_lock, true); 173 __DEFINE_UNLOCK_GUARD(irqdesc_lock, struct irq_desc, 174 __irq_put_desc_unlock(_T->lock, _T->flags, _T->bus), 175 unsigned long flags; bool bus); 176 177 static inline class_irqdesc_lock_t class_irqdesc_lock_constructor(unsigned int irq, bool bus, 178 unsigned int check) 179 { 180 class_irqdesc_lock_t _t = { .bus = bus, }; 181 182 _t.lock = __irq_get_desc_lock(irq, &_t.flags, bus, check); 183 184 return _t; 185 } 186 187 #define scoped_irqdesc_get_and_lock(_irq, _check) \ 188 scoped_guard(irqdesc_lock, _irq, false, _check) 189 190 #define scoped_irqdesc_get_and_buslock(_irq, _check) \ 191 scoped_guard(irqdesc_lock, _irq, true, _check) 192 193 #define scoped_irqdesc ((struct irq_desc *)(__guard_ptr(irqdesc_lock)(&scope))) 194 195 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors) 196 197 static inline unsigned int irqd_get(struct irq_data *d) 198 { 199 return __irqd_to_state(d); 200 } 201 202 /* 203 * Manipulation functions for irq_data.state 204 */ 205 static inline void irqd_set_move_pending(struct irq_data *d) 206 { 207 __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING; 208 } 209 210 static inline void irqd_clr_move_pending(struct irq_data *d) 211 { 212 __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING; 213 } 214 215 static inline void irqd_set_managed_shutdown(struct irq_data *d) 216 { 217 __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN; 218 } 219 220 static inline void irqd_clr_managed_shutdown(struct irq_data *d) 221 { 222 __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN; 223 } 224 225 static inline void irqd_clear(struct irq_data *d, unsigned int mask) 226 { 227 __irqd_to_state(d) &= ~mask; 228 } 229 230 static inline void irqd_set(struct irq_data *d, unsigned int mask) 231 { 232 __irqd_to_state(d) |= mask; 233 } 234 235 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) 236 { 237 return __irqd_to_state(d) & mask; 238 } 239 240 static inline void irq_state_set_disabled(struct irq_desc *desc) 241 { 242 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED); 243 } 244 245 static inline void irq_state_set_masked(struct irq_desc *desc) 246 { 247 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED); 248 } 249 250 #undef __irqd_to_state 251 252 static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc) 253 { 254 __this_cpu_inc(desc->kstat_irqs->cnt); 255 __this_cpu_inc(kstat.irqs_sum); 256 } 257 258 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc) 259 { 260 __kstat_incr_irqs_this_cpu(desc); 261 desc->tot_count++; 262 } 263 264 static inline int irq_desc_get_node(struct irq_desc *desc) 265 { 266 return irq_common_data_get_node(&desc->irq_common_data); 267 } 268 269 static inline int irq_desc_is_chained(struct irq_desc *desc) 270 { 271 return (desc->action && desc->action == &chained_action); 272 } 273 274 static inline bool irq_is_nmi(struct irq_desc *desc) 275 { 276 return desc->istate & IRQS_NMI; 277 } 278 279 #ifdef CONFIG_PM_SLEEP 280 void irq_pm_handle_wakeup(struct irq_desc *desc); 281 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action); 282 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action); 283 #else 284 static inline void irq_pm_handle_wakeup(struct irq_desc *desc) { } 285 static inline void 286 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { } 287 static inline void 288 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { } 289 #endif 290 291 #ifdef CONFIG_GENERIC_IRQ_CHIP 292 void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, 293 int num_ct, unsigned int irq_base, 294 void __iomem *reg_base, irq_flow_handler_t handler); 295 #else 296 static inline void 297 irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, 298 int num_ct, unsigned int irq_base, 299 void __iomem *reg_base, irq_flow_handler_t handler) { } 300 #endif /* CONFIG_GENERIC_IRQ_CHIP */ 301 302 #ifdef CONFIG_GENERIC_PENDING_IRQ 303 static inline bool irq_can_move_pcntxt(struct irq_data *data) 304 { 305 return !(data->chip->flags & IRQCHIP_MOVE_DEFERRED); 306 } 307 static inline bool irq_move_pending(struct irq_data *data) 308 { 309 return irqd_is_setaffinity_pending(data); 310 } 311 static inline void 312 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) 313 { 314 cpumask_copy(desc->pending_mask, mask); 315 } 316 static inline void 317 irq_get_pending(struct cpumask *mask, struct irq_desc *desc) 318 { 319 cpumask_copy(mask, desc->pending_mask); 320 } 321 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) 322 { 323 return desc->pending_mask; 324 } 325 bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear); 326 void irq_force_complete_move(struct irq_desc *desc); 327 #else /* CONFIG_GENERIC_PENDING_IRQ */ 328 static inline bool irq_can_move_pcntxt(struct irq_data *data) 329 { 330 return true; 331 } 332 static inline bool irq_move_pending(struct irq_data *data) 333 { 334 return false; 335 } 336 static inline void 337 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) 338 { 339 } 340 static inline void 341 irq_get_pending(struct cpumask *mask, struct irq_desc *desc) 342 { 343 } 344 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) 345 { 346 return NULL; 347 } 348 static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear) 349 { 350 return false; 351 } 352 static inline void irq_force_complete_move(struct irq_desc *desc) { } 353 #endif /* !CONFIG_GENERIC_PENDING_IRQ */ 354 355 #if !defined(CONFIG_IRQ_DOMAIN) || !defined(CONFIG_IRQ_DOMAIN_HIERARCHY) 356 static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve) 357 { 358 irqd_set_activated(data); 359 return 0; 360 } 361 static inline void irq_domain_deactivate_irq(struct irq_data *data) 362 { 363 irqd_clr_activated(data); 364 } 365 #endif 366 367 static inline struct irq_data *irqd_get_parent_data(struct irq_data *irqd) 368 { 369 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY 370 return irqd->parent_data; 371 #else 372 return NULL; 373 #endif 374 } 375 376 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS 377 #include <linux/debugfs.h> 378 379 struct irq_bit_descr { 380 unsigned int mask; 381 char *name; 382 }; 383 384 #define BIT_MASK_DESCR(m) { .mask = m, .name = #m } 385 386 void irq_debug_show_bits(struct seq_file *m, int ind, unsigned int state, 387 const struct irq_bit_descr *sd, int size); 388 389 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc); 390 static inline void irq_remove_debugfs_entry(struct irq_desc *desc) 391 { 392 debugfs_remove(desc->debugfs_file); 393 kfree(desc->dev_name); 394 } 395 void irq_debugfs_copy_devname(int irq, struct device *dev); 396 # ifdef CONFIG_IRQ_DOMAIN 397 void irq_domain_debugfs_init(struct dentry *root); 398 # else 399 static inline void irq_domain_debugfs_init(struct dentry *root) 400 { 401 } 402 # endif 403 #else /* CONFIG_GENERIC_IRQ_DEBUGFS */ 404 static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d) 405 { 406 } 407 static inline void irq_remove_debugfs_entry(struct irq_desc *d) 408 { 409 } 410 static inline void irq_debugfs_copy_devname(int irq, struct device *dev) 411 { 412 } 413 #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */ 414