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 24 extern 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 */ 34 enum { 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 */ 60 enum { 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 77 extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags); 78 extern void __disable_irq(struct irq_desc *desc); 79 extern 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 87 extern int irq_activate(struct irq_desc *desc); 88 extern int irq_activate_and_startup(struct irq_desc *desc, bool resend); 89 extern int irq_startup(struct irq_desc *desc, bool resend, bool force); 90 91 extern void irq_shutdown(struct irq_desc *desc); 92 extern void irq_shutdown_and_deactivate(struct irq_desc *desc); 93 extern void irq_enable(struct irq_desc *desc); 94 extern void irq_disable(struct irq_desc *desc); 95 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu); 96 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu); 97 extern void mask_irq(struct irq_desc *desc); 98 extern void unmask_irq(struct irq_desc *desc); 99 extern void unmask_threaded_irq(struct irq_desc *desc); 100 101 extern unsigned int kstat_irqs_desc(struct irq_desc *desc, const struct cpumask *cpumask); 102 103 #ifdef CONFIG_SPARSE_IRQ 104 static inline void irq_mark_irq(unsigned int irq) { } 105 #else 106 extern void irq_mark_irq(unsigned int irq); 107 #endif 108 109 extern int __irq_get_irqchip_state(struct irq_data *data, 110 enum irqchip_irq_state which, 111 bool *state); 112 113 irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc); 114 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc); 115 irqreturn_t handle_irq_event(struct irq_desc *desc); 116 117 /* Resending of interrupts :*/ 118 int check_irq_resend(struct irq_desc *desc, bool inject); 119 void clear_irq_resend(struct irq_desc *desc); 120 void irq_resend_init(struct irq_desc *desc); 121 bool irq_wait_for_poll(struct irq_desc *desc); 122 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action); 123 124 void wake_threads_waitq(struct irq_desc *desc); 125 126 #ifdef CONFIG_PROC_FS 127 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); 128 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc); 129 extern void register_handler_proc(unsigned int irq, struct irqaction *action); 130 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action); 131 #else 132 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { } 133 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { } 134 static inline void register_handler_proc(unsigned int irq, 135 struct irqaction *action) { } 136 static inline void unregister_handler_proc(unsigned int irq, 137 struct irqaction *action) { } 138 #endif 139 140 extern bool irq_can_set_affinity_usr(unsigned int irq); 141 142 extern void irq_set_thread_affinity(struct irq_desc *desc); 143 144 extern int irq_do_set_affinity(struct irq_data *data, 145 const struct cpumask *dest, bool force); 146 147 #ifdef CONFIG_SMP 148 extern int irq_setup_affinity(struct irq_desc *desc); 149 #else 150 static 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 */ 154 static 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 } 159 160 static 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) 174 175 struct irq_desc * 176 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, 177 unsigned int check); 178 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus); 179 180 static inline struct irq_desc * 181 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check) 182 { 183 return __irq_get_desc_lock(irq, flags, true, check); 184 } 185 186 static inline void 187 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags) 188 { 189 __irq_put_desc_unlock(desc, flags, true); 190 } 191 192 static inline struct irq_desc * 193 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check) 194 { 195 return __irq_get_desc_lock(irq, flags, false, check); 196 } 197 198 static inline void 199 irq_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) 205 206 static 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 */ 214 static inline void irqd_set_move_pending(struct irq_data *d) 215 { 216 __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING; 217 } 218 219 static inline void irqd_clr_move_pending(struct irq_data *d) 220 { 221 __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING; 222 } 223 224 static inline void irqd_set_managed_shutdown(struct irq_data *d) 225 { 226 __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN; 227 } 228 229 static inline void irqd_clr_managed_shutdown(struct irq_data *d) 230 { 231 __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN; 232 } 233 234 static inline void irqd_clear(struct irq_data *d, unsigned int mask) 235 { 236 __irqd_to_state(d) &= ~mask; 237 } 238 239 static inline void irqd_set(struct irq_data *d, unsigned int mask) 240 { 241 __irqd_to_state(d) |= mask; 242 } 243 244 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) 245 { 246 return __irqd_to_state(d) & mask; 247 } 248 249 static inline void irq_state_set_disabled(struct irq_desc *desc) 250 { 251 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED); 252 } 253 254 static 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 260 261 static 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 } 266 267 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc) 268 { 269 __kstat_incr_irqs_this_cpu(desc); 270 desc->tot_count++; 271 } 272 273 static inline int irq_desc_get_node(struct irq_desc *desc) 274 { 275 return irq_common_data_get_node(&desc->irq_common_data); 276 } 277 278 static inline int irq_desc_is_chained(struct irq_desc *desc) 279 { 280 return (desc->action && desc->action == &chained_action); 281 } 282 283 static inline bool irq_is_nmi(struct irq_desc *desc) 284 { 285 return desc->istate & IRQS_NMI; 286 } 287 288 #ifdef CONFIG_PM_SLEEP 289 bool irq_pm_check_wakeup(struct irq_desc *desc); 290 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action); 291 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action); 292 #else 293 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; } 294 static inline void 295 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { } 296 static inline void 297 irq_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 */ 311 struct irq_timings { 312 u64 values[IRQ_TIMINGS_SIZE]; 313 int count; 314 }; 315 316 DECLARE_PER_CPU(struct irq_timings, irq_timings); 317 318 extern void irq_timings_free(int irq); 319 extern int irq_timings_alloc(int irq); 320 321 static 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 } 327 328 static 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 } 353 354 extern void irq_timings_enable(void); 355 extern void irq_timings_disable(void); 356 357 DECLARE_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 */ 365 static inline u64 irq_timing_encode(u64 timestamp, int irq) 366 { 367 return (timestamp << 16) | irq; 368 } 369 370 static inline int irq_timing_decode(u64 value, u64 *timestamp) 371 { 372 *timestamp = value >> 16; 373 return value & U16_MAX; 374 } 375 376 static __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 */ 394 static __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 403 static inline void irq_remove_timings(struct irq_desc *desc) {} 404 static inline void irq_setup_timings(struct irq_desc *desc, 405 struct irqaction *act) {}; 406 static inline void record_irq_time(struct irq_desc *desc) {} 407 #endif /* CONFIG_IRQ_TIMINGS */ 408 409 410 #ifdef CONFIG_GENERIC_IRQ_CHIP 411 void 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 415 static inline void 416 irq_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 422 static inline bool irq_can_move_pcntxt(struct irq_data *data) 423 { 424 return irqd_can_move_in_process_context(data); 425 } 426 static inline bool irq_move_pending(struct irq_data *data) 427 { 428 return irqd_is_setaffinity_pending(data); 429 } 430 static inline void 431 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) 432 { 433 cpumask_copy(desc->pending_mask, mask); 434 } 435 static inline void 436 irq_get_pending(struct cpumask *mask, struct irq_desc *desc) 437 { 438 cpumask_copy(mask, desc->pending_mask); 439 } 440 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) 441 { 442 return desc->pending_mask; 443 } 444 static inline bool handle_enforce_irqctx(struct irq_data *data) 445 { 446 return irqd_is_handle_enforce_irqctx(data); 447 } 448 bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear); 449 #else /* CONFIG_GENERIC_PENDING_IRQ */ 450 static inline bool irq_can_move_pcntxt(struct irq_data *data) 451 { 452 return true; 453 } 454 static inline bool irq_move_pending(struct irq_data *data) 455 { 456 return false; 457 } 458 static inline void 459 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) 460 { 461 } 462 static inline void 463 irq_get_pending(struct cpumask *mask, struct irq_desc *desc) 464 { 465 } 466 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) 467 { 468 return NULL; 469 } 470 static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear) 471 { 472 return false; 473 } 474 static 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) 481 static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve) 482 { 483 irqd_set_activated(data); 484 return 0; 485 } 486 static inline void irq_domain_deactivate_irq(struct irq_data *data) 487 { 488 irqd_clr_activated(data); 489 } 490 #endif 491 492 static 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> 503 504 struct irq_bit_descr { 505 unsigned int mask; 506 char *name; 507 }; 508 509 #define BIT_MASK_DESCR(m) { .mask = m, .name = #m } 510 511 void irq_debug_show_bits(struct seq_file *m, int ind, unsigned int state, 512 const struct irq_bit_descr *sd, int size); 513 514 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc); 515 static inline void irq_remove_debugfs_entry(struct irq_desc *desc) 516 { 517 debugfs_remove(desc->debugfs_file); 518 kfree(desc->dev_name); 519 } 520 void irq_debugfs_copy_devname(int irq, struct device *dev); 521 # ifdef CONFIG_IRQ_DOMAIN 522 void irq_domain_debugfs_init(struct dentry *root); 523 # else 524 static inline void irq_domain_debugfs_init(struct dentry *root) 525 { 526 } 527 # endif 528 #else /* CONFIG_GENERIC_IRQ_DEBUGFS */ 529 static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d) 530 { 531 } 532 static inline void irq_remove_debugfs_entry(struct irq_desc *d) 533 { 534 } 535 static inline void irq_debugfs_copy_devname(int irq, struct device *dev) 536 { 537 } 538 #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */ 539