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 #ifdef CONFIG_SPARSE_IRQ 102 static inline void irq_mark_irq(unsigned int irq) { } 103 #else 104 extern void irq_mark_irq(unsigned int irq); 105 #endif 106 107 extern int __irq_get_irqchip_state(struct irq_data *data, 108 enum irqchip_irq_state which, 109 bool *state); 110 111 irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc); 112 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc); 113 irqreturn_t handle_irq_event(struct irq_desc *desc); 114 115 /* Resending of interrupts :*/ 116 int check_irq_resend(struct irq_desc *desc, bool inject); 117 void clear_irq_resend(struct irq_desc *desc); 118 void irq_resend_init(struct irq_desc *desc); 119 bool irq_wait_for_poll(struct irq_desc *desc); 120 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action); 121 122 void wake_threads_waitq(struct irq_desc *desc); 123 124 #ifdef CONFIG_PROC_FS 125 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); 126 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc); 127 extern void register_handler_proc(unsigned int irq, struct irqaction *action); 128 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action); 129 #else 130 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { } 131 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { } 132 static inline void register_handler_proc(unsigned int irq, 133 struct irqaction *action) { } 134 static inline void unregister_handler_proc(unsigned int irq, 135 struct irqaction *action) { } 136 #endif 137 138 extern bool irq_can_set_affinity_usr(unsigned int irq); 139 140 extern void irq_set_thread_affinity(struct irq_desc *desc); 141 142 extern int irq_do_set_affinity(struct irq_data *data, 143 const struct cpumask *dest, bool force); 144 145 #ifdef CONFIG_SMP 146 extern int irq_setup_affinity(struct irq_desc *desc); 147 #else 148 static 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 */ 152 static 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 } 157 158 static 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) 172 173 struct irq_desc * 174 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, 175 unsigned int check); 176 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus); 177 178 static inline struct irq_desc * 179 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check) 180 { 181 return __irq_get_desc_lock(irq, flags, true, check); 182 } 183 184 static inline void 185 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags) 186 { 187 __irq_put_desc_unlock(desc, flags, true); 188 } 189 190 static inline struct irq_desc * 191 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check) 192 { 193 return __irq_get_desc_lock(irq, flags, false, check); 194 } 195 196 static inline void 197 irq_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) 203 204 static 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 */ 212 static inline void irqd_set_move_pending(struct irq_data *d) 213 { 214 __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING; 215 } 216 217 static inline void irqd_clr_move_pending(struct irq_data *d) 218 { 219 __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING; 220 } 221 222 static inline void irqd_set_managed_shutdown(struct irq_data *d) 223 { 224 __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN; 225 } 226 227 static inline void irqd_clr_managed_shutdown(struct irq_data *d) 228 { 229 __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN; 230 } 231 232 static inline void irqd_clear(struct irq_data *d, unsigned int mask) 233 { 234 __irqd_to_state(d) &= ~mask; 235 } 236 237 static inline void irqd_set(struct irq_data *d, unsigned int mask) 238 { 239 __irqd_to_state(d) |= mask; 240 } 241 242 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) 243 { 244 return __irqd_to_state(d) & mask; 245 } 246 247 static inline void irq_state_set_disabled(struct irq_desc *desc) 248 { 249 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED); 250 } 251 252 static 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 258 259 static 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 } 264 265 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc) 266 { 267 __kstat_incr_irqs_this_cpu(desc); 268 desc->tot_count++; 269 } 270 271 static inline int irq_desc_get_node(struct irq_desc *desc) 272 { 273 return irq_common_data_get_node(&desc->irq_common_data); 274 } 275 276 static 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 282 bool irq_pm_check_wakeup(struct irq_desc *desc); 283 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action); 284 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action); 285 #else 286 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; } 287 static inline void 288 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { } 289 static inline void 290 irq_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 */ 304 struct irq_timings { 305 u64 values[IRQ_TIMINGS_SIZE]; 306 int count; 307 }; 308 309 DECLARE_PER_CPU(struct irq_timings, irq_timings); 310 311 extern void irq_timings_free(int irq); 312 extern int irq_timings_alloc(int irq); 313 314 static 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 } 320 321 static 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 } 346 347 extern void irq_timings_enable(void); 348 extern void irq_timings_disable(void); 349 350 DECLARE_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 */ 358 static inline u64 irq_timing_encode(u64 timestamp, int irq) 359 { 360 return (timestamp << 16) | irq; 361 } 362 363 static inline int irq_timing_decode(u64 value, u64 *timestamp) 364 { 365 *timestamp = value >> 16; 366 return value & U16_MAX; 367 } 368 369 static __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 */ 387 static __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 396 static inline void irq_remove_timings(struct irq_desc *desc) {} 397 static inline void irq_setup_timings(struct irq_desc *desc, 398 struct irqaction *act) {}; 399 static inline void record_irq_time(struct irq_desc *desc) {} 400 #endif /* CONFIG_IRQ_TIMINGS */ 401 402 403 #ifdef CONFIG_GENERIC_IRQ_CHIP 404 void 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 408 static inline void 409 irq_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 415 static inline bool irq_can_move_pcntxt(struct irq_data *data) 416 { 417 return irqd_can_move_in_process_context(data); 418 } 419 static inline bool irq_move_pending(struct irq_data *data) 420 { 421 return irqd_is_setaffinity_pending(data); 422 } 423 static inline void 424 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) 425 { 426 cpumask_copy(desc->pending_mask, mask); 427 } 428 static inline void 429 irq_get_pending(struct cpumask *mask, struct irq_desc *desc) 430 { 431 cpumask_copy(mask, desc->pending_mask); 432 } 433 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) 434 { 435 return desc->pending_mask; 436 } 437 static inline bool handle_enforce_irqctx(struct irq_data *data) 438 { 439 return irqd_is_handle_enforce_irqctx(data); 440 } 441 bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear); 442 #else /* CONFIG_GENERIC_PENDING_IRQ */ 443 static inline bool irq_can_move_pcntxt(struct irq_data *data) 444 { 445 return true; 446 } 447 static inline bool irq_move_pending(struct irq_data *data) 448 { 449 return false; 450 } 451 static inline void 452 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) 453 { 454 } 455 static inline void 456 irq_get_pending(struct cpumask *mask, struct irq_desc *desc) 457 { 458 } 459 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) 460 { 461 return NULL; 462 } 463 static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear) 464 { 465 return false; 466 } 467 static 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) 474 static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve) 475 { 476 irqd_set_activated(data); 477 return 0; 478 } 479 static inline void irq_domain_deactivate_irq(struct irq_data *data) 480 { 481 irqd_clr_activated(data); 482 } 483 #endif 484 485 static 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> 496 497 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc); 498 static inline void irq_remove_debugfs_entry(struct irq_desc *desc) 499 { 500 debugfs_remove(desc->debugfs_file); 501 kfree(desc->dev_name); 502 } 503 void irq_debugfs_copy_devname(int irq, struct device *dev); 504 # ifdef CONFIG_IRQ_DOMAIN 505 void irq_domain_debugfs_init(struct dentry *root); 506 # else 507 static inline void irq_domain_debugfs_init(struct dentry *root) 508 { 509 } 510 # endif 511 #else /* CONFIG_GENERIC_IRQ_DEBUGFS */ 512 static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d) 513 { 514 } 515 static inline void irq_remove_debugfs_entry(struct irq_desc *d) 516 { 517 } 518 static inline void irq_debugfs_copy_devname(int irq, struct device *dev) 519 { 520 } 521 #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */ 522