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