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 22extern bool noirqdebug; 23 24extern struct irqaction chained_action; 25 26/* 27 * Bits used by threaded handlers: 28 * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run 29 * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed 30 * IRQTF_AFFINITY - irq thread is requested to adjust affinity 31 * IRQTF_FORCED_THREAD - irq action is force threaded 32 * IRQTF_READY - signals that irq thread is ready 33 */ 34enum { 35 IRQTF_RUNTHREAD, 36 IRQTF_WARNED, 37 IRQTF_AFFINITY, 38 IRQTF_FORCED_THREAD, 39 IRQTF_READY, 40}; 41 42/* 43 * Bit masks for desc->core_internal_state__do_not_mess_with_it 44 * 45 * IRQS_AUTODETECT - autodetection in progress 46 * IRQS_SPURIOUS_DISABLED - was disabled due to spurious interrupt 47 * detection 48 * IRQS_POLL_INPROGRESS - polling in progress 49 * IRQS_ONESHOT - irq is not unmasked in primary handler 50 * IRQS_REPLAY - irq has been resent and will not be resent 51 * again until the handler has run and cleared 52 * this flag. 53 * IRQS_WAITING - irq is waiting 54 * IRQS_PENDING - irq needs to be resent and should be resent 55 * at the next available opportunity. 56 * IRQS_SUSPENDED - irq is suspended 57 * IRQS_NMI - irq line is used to deliver NMIs 58 * IRQS_SYSFS - descriptor has been added to sysfs 59 */ 60enum { 61 IRQS_AUTODETECT = 0x00000001, 62 IRQS_SPURIOUS_DISABLED = 0x00000002, 63 IRQS_POLL_INPROGRESS = 0x00000008, 64 IRQS_ONESHOT = 0x00000020, 65 IRQS_REPLAY = 0x00000040, 66 IRQS_WAITING = 0x00000080, 67 IRQS_PENDING = 0x00000200, 68 IRQS_SUSPENDED = 0x00000800, 69 IRQS_TIMINGS = 0x00001000, 70 IRQS_NMI = 0x00002000, 71 IRQS_SYSFS = 0x00004000, 72}; 73 74#include "debug.h" 75#include "settings.h" 76 77extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags); 78extern void __disable_irq(struct irq_desc *desc); 79extern void __enable_irq(struct irq_desc *desc); 80 81#define IRQ_RESEND true 82#define IRQ_NORESEND false 83 84#define IRQ_START_FORCE true 85#define IRQ_START_COND false 86 87extern int irq_activate(struct irq_desc *desc); 88extern int irq_activate_and_startup(struct irq_desc *desc, bool resend); 89extern int irq_startup(struct irq_desc *desc, bool resend, bool force); 90 91extern void irq_shutdown(struct irq_desc *desc); 92extern void irq_shutdown_and_deactivate(struct irq_desc *desc); 93extern void irq_enable(struct irq_desc *desc); 94extern void irq_disable(struct irq_desc *desc); 95extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu); 96extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu); 97extern void mask_irq(struct irq_desc *desc); 98extern void unmask_irq(struct irq_desc *desc); 99extern void unmask_threaded_irq(struct irq_desc *desc); 100 101extern unsigned int kstat_irqs_desc(struct irq_desc *desc, const struct cpumask *cpumask); 102 103#ifdef CONFIG_SPARSE_IRQ 104static inline void irq_mark_irq(unsigned int irq) { } 105#else 106extern void irq_mark_irq(unsigned int irq); 107#endif 108 109extern int __irq_get_irqchip_state(struct irq_data *data, 110 enum irqchip_irq_state which, 111 bool *state); 112 113irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc); 114irqreturn_t handle_irq_event_percpu(struct irq_desc *desc); 115irqreturn_t handle_irq_event(struct irq_desc *desc); 116 117/* Resending of interrupts :*/ 118int check_irq_resend(struct irq_desc *desc, bool inject); 119void clear_irq_resend(struct irq_desc *desc); 120void irq_resend_init(struct irq_desc *desc); 121bool irq_wait_for_poll(struct irq_desc *desc); 122void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action); 123 124void wake_threads_waitq(struct irq_desc *desc); 125 126#ifdef CONFIG_PROC_FS 127extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); 128extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc); 129extern void register_handler_proc(unsigned int irq, struct irqaction *action); 130extern void unregister_handler_proc(unsigned int irq, struct irqaction *action); 131#else 132static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { } 133static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { } 134static inline void register_handler_proc(unsigned int irq, 135 struct irqaction *action) { } 136static inline void unregister_handler_proc(unsigned int irq, 137 struct irqaction *action) { } 138#endif 139 140extern bool irq_can_set_affinity_usr(unsigned int irq); 141 142extern void irq_set_thread_affinity(struct irq_desc *desc); 143 144extern int irq_do_set_affinity(struct irq_data *data, 145 const struct cpumask *dest, bool force); 146 147#ifdef CONFIG_SMP 148extern int irq_setup_affinity(struct irq_desc *desc); 149#else 150static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; } 151#endif 152 153/* Inline functions for support of irq chips on slow busses */ 154static inline void chip_bus_lock(struct irq_desc *desc) 155{ 156 if (unlikely(desc->irq_data.chip->irq_bus_lock)) 157 desc->irq_data.chip->irq_bus_lock(&desc->irq_data); 158} 159 160static inline void chip_bus_sync_unlock(struct irq_desc *desc) 161{ 162 if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock)) 163 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data); 164} 165 166#define _IRQ_DESC_CHECK (1 << 0) 167#define _IRQ_DESC_PERCPU (1 << 1) 168 169#define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK) 170#define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU) 171 172#define for_each_action_of_desc(desc, act) \ 173 for (act = desc->action; act; act = act->next) 174 175struct irq_desc * 176__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, 177 unsigned int check); 178void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus); 179 180static inline struct irq_desc * 181irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check) 182{ 183 return __irq_get_desc_lock(irq, flags, true, check); 184} 185 186static inline void 187irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags) 188{ 189 __irq_put_desc_unlock(desc, flags, true); 190} 191 192static inline struct irq_desc * 193irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check) 194{ 195 return __irq_get_desc_lock(irq, flags, false, check); 196} 197 198static inline void 199irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags) 200{ 201 __irq_put_desc_unlock(desc, flags, false); 202} 203 204#define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors) 205 206static inline unsigned int irqd_get(struct irq_data *d) 207{ 208 return __irqd_to_state(d); 209} 210 211/* 212 * Manipulation functions for irq_data.state 213 */ 214static inline void irqd_set_move_pending(struct irq_data *d) 215{ 216 __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING; 217} 218 219static inline void irqd_clr_move_pending(struct irq_data *d) 220{ 221 __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING; 222} 223 224static inline void irqd_set_managed_shutdown(struct irq_data *d) 225{ 226 __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN; 227} 228 229static inline void irqd_clr_managed_shutdown(struct irq_data *d) 230{ 231 __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN; 232} 233 234static inline void irqd_clear(struct irq_data *d, unsigned int mask) 235{ 236 __irqd_to_state(d) &= ~mask; 237} 238 239static inline void irqd_set(struct irq_data *d, unsigned int mask) 240{ 241 __irqd_to_state(d) |= mask; 242} 243 244static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) 245{ 246 return __irqd_to_state(d) & mask; 247} 248 249static inline void irq_state_set_disabled(struct irq_desc *desc) 250{ 251 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED); 252} 253 254static inline void irq_state_set_masked(struct irq_desc *desc) 255{ 256 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED); 257} 258 259#undef __irqd_to_state 260 261static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc) 262{ 263 __this_cpu_inc(desc->kstat_irqs->cnt); 264 __this_cpu_inc(kstat.irqs_sum); 265} 266 267static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc) 268{ 269 __kstat_incr_irqs_this_cpu(desc); 270 desc->tot_count++; 271} 272 273static inline int irq_desc_get_node(struct irq_desc *desc) 274{ 275 return irq_common_data_get_node(&desc->irq_common_data); 276} 277 278static inline int irq_desc_is_chained(struct irq_desc *desc) 279{ 280 return (desc->action && desc->action == &chained_action); 281} 282 283static inline bool irq_is_nmi(struct irq_desc *desc) 284{ 285 return desc->istate & IRQS_NMI; 286} 287 288#ifdef CONFIG_PM_SLEEP 289bool irq_pm_check_wakeup(struct irq_desc *desc); 290void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action); 291void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action); 292#else 293static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; } 294static inline void 295irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { } 296static inline void 297irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { } 298#endif 299 300#ifdef CONFIG_IRQ_TIMINGS 301 302#define IRQ_TIMINGS_SHIFT 5 303#define IRQ_TIMINGS_SIZE (1 << IRQ_TIMINGS_SHIFT) 304#define IRQ_TIMINGS_MASK (IRQ_TIMINGS_SIZE - 1) 305 306/** 307 * struct irq_timings - irq timings storing structure 308 * @values: a circular buffer of u64 encoded <timestamp,irq> values 309 * @count: the number of elements in the array 310 */ 311struct irq_timings { 312 u64 values[IRQ_TIMINGS_SIZE]; 313 int count; 314}; 315 316DECLARE_PER_CPU(struct irq_timings, irq_timings); 317 318extern void irq_timings_free(int irq); 319extern int irq_timings_alloc(int irq); 320 321static inline void irq_remove_timings(struct irq_desc *desc) 322{ 323 desc->istate &= ~IRQS_TIMINGS; 324 325 irq_timings_free(irq_desc_get_irq(desc)); 326} 327 328static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act) 329{ 330 int irq = irq_desc_get_irq(desc); 331 int ret; 332 333 /* 334 * We don't need the measurement because the idle code already 335 * knows the next expiry event. 336 */ 337 if (act->flags & __IRQF_TIMER) 338 return; 339 340 /* 341 * In case the timing allocation fails, we just want to warn, 342 * not fail, so letting the system boot anyway. 343 */ 344 ret = irq_timings_alloc(irq); 345 if (ret) { 346 pr_warn("Failed to allocate irq timing stats for irq%d (%d)", 347 irq, ret); 348 return; 349 } 350 351 desc->istate |= IRQS_TIMINGS; 352} 353 354extern void irq_timings_enable(void); 355extern void irq_timings_disable(void); 356 357DECLARE_STATIC_KEY_FALSE(irq_timing_enabled); 358 359/* 360 * The interrupt number and the timestamp are encoded into a single 361 * u64 variable to optimize the size. 362 * 48 bit time stamp and 16 bit IRQ number is way sufficient. 363 * Who cares an IRQ after 78 hours of idle time? 364 */ 365static inline u64 irq_timing_encode(u64 timestamp, int irq) 366{ 367 return (timestamp << 16) | irq; 368} 369 370static inline int irq_timing_decode(u64 value, u64 *timestamp) 371{ 372 *timestamp = value >> 16; 373 return value & U16_MAX; 374} 375 376static __always_inline void irq_timings_push(u64 ts, int irq) 377{ 378 struct irq_timings *timings = this_cpu_ptr(&irq_timings); 379 380 timings->values[timings->count & IRQ_TIMINGS_MASK] = 381 irq_timing_encode(ts, irq); 382 383 timings->count++; 384} 385 386/* 387 * The function record_irq_time is only called in one place in the 388 * interrupts handler. We want this function always inline so the code 389 * inside is embedded in the function and the static key branching 390 * code can act at the higher level. Without the explicit 391 * __always_inline we can end up with a function call and a small 392 * overhead in the hotpath for nothing. 393 */ 394static __always_inline void record_irq_time(struct irq_desc *desc) 395{ 396 if (!static_branch_likely(&irq_timing_enabled)) 397 return; 398 399 if (desc->istate & IRQS_TIMINGS) 400 irq_timings_push(local_clock(), irq_desc_get_irq(desc)); 401} 402#else 403static inline void irq_remove_timings(struct irq_desc *desc) {} 404static inline void irq_setup_timings(struct irq_desc *desc, 405 struct irqaction *act) {}; 406static inline void record_irq_time(struct irq_desc *desc) {} 407#endif /* CONFIG_IRQ_TIMINGS */ 408 409 410#ifdef CONFIG_GENERIC_IRQ_CHIP 411void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, 412 int num_ct, unsigned int irq_base, 413 void __iomem *reg_base, irq_flow_handler_t handler); 414#else 415static inline void 416irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, 417 int num_ct, unsigned int irq_base, 418 void __iomem *reg_base, irq_flow_handler_t handler) { } 419#endif /* CONFIG_GENERIC_IRQ_CHIP */ 420 421#ifdef CONFIG_GENERIC_PENDING_IRQ 422static inline bool irq_can_move_pcntxt(struct irq_data *data) 423{ 424 return irqd_can_move_in_process_context(data); 425} 426static inline bool irq_move_pending(struct irq_data *data) 427{ 428 return irqd_is_setaffinity_pending(data); 429} 430static inline void 431irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) 432{ 433 cpumask_copy(desc->pending_mask, mask); 434} 435static inline void 436irq_get_pending(struct cpumask *mask, struct irq_desc *desc) 437{ 438 cpumask_copy(mask, desc->pending_mask); 439} 440static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) 441{ 442 return desc->pending_mask; 443} 444static inline bool handle_enforce_irqctx(struct irq_data *data) 445{ 446 return irqd_is_handle_enforce_irqctx(data); 447} 448bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear); 449#else /* CONFIG_GENERIC_PENDING_IRQ */ 450static inline bool irq_can_move_pcntxt(struct irq_data *data) 451{ 452 return true; 453} 454static inline bool irq_move_pending(struct irq_data *data) 455{ 456 return false; 457} 458static inline void 459irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) 460{ 461} 462static inline void 463irq_get_pending(struct cpumask *mask, struct irq_desc *desc) 464{ 465} 466static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) 467{ 468 return NULL; 469} 470static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear) 471{ 472 return false; 473} 474static inline bool handle_enforce_irqctx(struct irq_data *data) 475{ 476 return false; 477} 478#endif /* !CONFIG_GENERIC_PENDING_IRQ */ 479 480#if !defined(CONFIG_IRQ_DOMAIN) || !defined(CONFIG_IRQ_DOMAIN_HIERARCHY) 481static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve) 482{ 483 irqd_set_activated(data); 484 return 0; 485} 486static inline void irq_domain_deactivate_irq(struct irq_data *data) 487{ 488 irqd_clr_activated(data); 489} 490#endif 491 492static inline struct irq_data *irqd_get_parent_data(struct irq_data *irqd) 493{ 494#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY 495 return irqd->parent_data; 496#else 497 return NULL; 498#endif 499} 500 501#ifdef CONFIG_GENERIC_IRQ_DEBUGFS 502#include <linux/debugfs.h> 503 504void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc); 505static inline void irq_remove_debugfs_entry(struct irq_desc *desc) 506{ 507 debugfs_remove(desc->debugfs_file); 508 kfree(desc->dev_name); 509} 510void irq_debugfs_copy_devname(int irq, struct device *dev); 511# ifdef CONFIG_IRQ_DOMAIN 512void irq_domain_debugfs_init(struct dentry *root); 513# else 514static inline void irq_domain_debugfs_init(struct dentry *root) 515{ 516} 517# endif 518#else /* CONFIG_GENERIC_IRQ_DEBUGFS */ 519static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d) 520{ 521} 522static inline void irq_remove_debugfs_entry(struct irq_desc *d) 523{ 524} 525static inline void irq_debugfs_copy_devname(int irq, struct device *dev) 526{ 527} 528#endif /* CONFIG_GENERIC_IRQ_DEBUGFS */ 529