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 IRQ_BITMAP_BITS (NR_IRQS + 8196) 16 #else 17 # define IRQ_BITMAP_BITS 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 is replayed 51 * IRQS_WAITING - irq is waiting 52 * IRQS_PENDING - irq is pending and replayed later 53 * IRQS_SUSPENDED - irq is suspended 54 * IRQS_NMI - irq line is used to deliver NMIs 55 * IRQS_SYSFS - descriptor has been added to sysfs 56 */ 57 enum { 58 IRQS_AUTODETECT = 0x00000001, 59 IRQS_SPURIOUS_DISABLED = 0x00000002, 60 IRQS_POLL_INPROGRESS = 0x00000008, 61 IRQS_ONESHOT = 0x00000020, 62 IRQS_REPLAY = 0x00000040, 63 IRQS_WAITING = 0x00000080, 64 IRQS_PENDING = 0x00000200, 65 IRQS_SUSPENDED = 0x00000800, 66 IRQS_TIMINGS = 0x00001000, 67 IRQS_NMI = 0x00002000, 68 IRQS_SYSFS = 0x00004000, 69 }; 70 71 #include "debug.h" 72 #include "settings.h" 73 74 extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags); 75 extern void __disable_irq(struct irq_desc *desc); 76 extern void __enable_irq(struct irq_desc *desc); 77 78 #define IRQ_RESEND true 79 #define IRQ_NORESEND false 80 81 #define IRQ_START_FORCE true 82 #define IRQ_START_COND false 83 84 extern int irq_activate(struct irq_desc *desc); 85 extern int irq_activate_and_startup(struct irq_desc *desc, bool resend); 86 extern int irq_startup(struct irq_desc *desc, bool resend, bool force); 87 88 extern void irq_shutdown(struct irq_desc *desc); 89 extern void irq_shutdown_and_deactivate(struct irq_desc *desc); 90 extern void irq_enable(struct irq_desc *desc); 91 extern void irq_disable(struct irq_desc *desc); 92 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu); 93 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu); 94 extern void mask_irq(struct irq_desc *desc); 95 extern void unmask_irq(struct irq_desc *desc); 96 extern void unmask_threaded_irq(struct irq_desc *desc); 97 98 #ifdef CONFIG_SPARSE_IRQ 99 static inline void irq_mark_irq(unsigned int irq) { } 100 #else 101 extern void irq_mark_irq(unsigned int irq); 102 #endif 103 104 extern int __irq_get_irqchip_state(struct irq_data *data, 105 enum irqchip_irq_state which, 106 bool *state); 107 108 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr); 109 110 irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc); 111 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc); 112 irqreturn_t handle_irq_event(struct irq_desc *desc); 113 114 /* Resending of interrupts :*/ 115 int check_irq_resend(struct irq_desc *desc, bool inject); 116 bool irq_wait_for_poll(struct irq_desc *desc); 117 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action); 118 119 #ifdef CONFIG_PROC_FS 120 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); 121 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc); 122 extern void register_handler_proc(unsigned int irq, struct irqaction *action); 123 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action); 124 #else 125 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { } 126 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { } 127 static inline void register_handler_proc(unsigned int irq, 128 struct irqaction *action) { } 129 static inline void unregister_handler_proc(unsigned int irq, 130 struct irqaction *action) { } 131 #endif 132 133 extern bool irq_can_set_affinity_usr(unsigned int irq); 134 135 extern void irq_set_thread_affinity(struct irq_desc *desc); 136 137 extern int irq_do_set_affinity(struct irq_data *data, 138 const struct cpumask *dest, bool force); 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 /* Inline functions for support of irq chips on slow busses */ 147 static inline void chip_bus_lock(struct irq_desc *desc) 148 { 149 if (unlikely(desc->irq_data.chip->irq_bus_lock)) 150 desc->irq_data.chip->irq_bus_lock(&desc->irq_data); 151 } 152 153 static inline void chip_bus_sync_unlock(struct irq_desc *desc) 154 { 155 if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock)) 156 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data); 157 } 158 159 #define _IRQ_DESC_CHECK (1 << 0) 160 #define _IRQ_DESC_PERCPU (1 << 1) 161 162 #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK) 163 #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU) 164 165 #define for_each_action_of_desc(desc, act) \ 166 for (act = desc->action; act; act = act->next) 167 168 struct irq_desc * 169 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, 170 unsigned int check); 171 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus); 172 173 static inline struct irq_desc * 174 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check) 175 { 176 return __irq_get_desc_lock(irq, flags, true, check); 177 } 178 179 static inline void 180 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags) 181 { 182 __irq_put_desc_unlock(desc, flags, true); 183 } 184 185 static inline struct irq_desc * 186 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check) 187 { 188 return __irq_get_desc_lock(irq, flags, false, check); 189 } 190 191 static inline void 192 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags) 193 { 194 __irq_put_desc_unlock(desc, flags, false); 195 } 196 197 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors) 198 199 static inline unsigned int irqd_get(struct irq_data *d) 200 { 201 return __irqd_to_state(d); 202 } 203 204 /* 205 * Manipulation functions for irq_data.state 206 */ 207 static inline void irqd_set_move_pending(struct irq_data *d) 208 { 209 __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING; 210 } 211 212 static inline void irqd_clr_move_pending(struct irq_data *d) 213 { 214 __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING; 215 } 216 217 static inline void irqd_set_managed_shutdown(struct irq_data *d) 218 { 219 __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN; 220 } 221 222 static inline void irqd_clr_managed_shutdown(struct irq_data *d) 223 { 224 __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN; 225 } 226 227 static inline void irqd_clear(struct irq_data *d, unsigned int mask) 228 { 229 __irqd_to_state(d) &= ~mask; 230 } 231 232 static inline void irqd_set(struct irq_data *d, unsigned int mask) 233 { 234 __irqd_to_state(d) |= mask; 235 } 236 237 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) 238 { 239 return __irqd_to_state(d) & mask; 240 } 241 242 static inline void irq_state_set_disabled(struct irq_desc *desc) 243 { 244 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED); 245 } 246 247 static inline void irq_state_set_masked(struct irq_desc *desc) 248 { 249 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED); 250 } 251 252 #undef __irqd_to_state 253 254 static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc) 255 { 256 __this_cpu_inc(*desc->kstat_irqs); 257 __this_cpu_inc(kstat.irqs_sum); 258 } 259 260 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc) 261 { 262 __kstat_incr_irqs_this_cpu(desc); 263 desc->tot_count++; 264 } 265 266 static inline int irq_desc_get_node(struct irq_desc *desc) 267 { 268 return irq_common_data_get_node(&desc->irq_common_data); 269 } 270 271 static inline int irq_desc_is_chained(struct irq_desc *desc) 272 { 273 return (desc->action && desc->action == &chained_action); 274 } 275 276 #ifdef CONFIG_PM_SLEEP 277 bool irq_pm_check_wakeup(struct irq_desc *desc); 278 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action); 279 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action); 280 #else 281 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; } 282 static inline void 283 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { } 284 static inline void 285 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { } 286 #endif 287 288 #ifdef CONFIG_IRQ_TIMINGS 289 290 #define IRQ_TIMINGS_SHIFT 5 291 #define IRQ_TIMINGS_SIZE (1 << IRQ_TIMINGS_SHIFT) 292 #define IRQ_TIMINGS_MASK (IRQ_TIMINGS_SIZE - 1) 293 294 /** 295 * struct irq_timings - irq timings storing structure 296 * @values: a circular buffer of u64 encoded <timestamp,irq> values 297 * @count: the number of elements in the array 298 */ 299 struct irq_timings { 300 u64 values[IRQ_TIMINGS_SIZE]; 301 int count; 302 }; 303 304 DECLARE_PER_CPU(struct irq_timings, irq_timings); 305 306 extern void irq_timings_free(int irq); 307 extern int irq_timings_alloc(int irq); 308 309 static inline void irq_remove_timings(struct irq_desc *desc) 310 { 311 desc->istate &= ~IRQS_TIMINGS; 312 313 irq_timings_free(irq_desc_get_irq(desc)); 314 } 315 316 static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act) 317 { 318 int irq = irq_desc_get_irq(desc); 319 int ret; 320 321 /* 322 * We don't need the measurement because the idle code already 323 * knows the next expiry event. 324 */ 325 if (act->flags & __IRQF_TIMER) 326 return; 327 328 /* 329 * In case the timing allocation fails, we just want to warn, 330 * not fail, so letting the system boot anyway. 331 */ 332 ret = irq_timings_alloc(irq); 333 if (ret) { 334 pr_warn("Failed to allocate irq timing stats for irq%d (%d)", 335 irq, ret); 336 return; 337 } 338 339 desc->istate |= IRQS_TIMINGS; 340 } 341 342 extern void irq_timings_enable(void); 343 extern void irq_timings_disable(void); 344 345 DECLARE_STATIC_KEY_FALSE(irq_timing_enabled); 346 347 /* 348 * The interrupt number and the timestamp are encoded into a single 349 * u64 variable to optimize the size. 350 * 48 bit time stamp and 16 bit IRQ number is way sufficient. 351 * Who cares an IRQ after 78 hours of idle time? 352 */ 353 static inline u64 irq_timing_encode(u64 timestamp, int irq) 354 { 355 return (timestamp << 16) | irq; 356 } 357 358 static inline int irq_timing_decode(u64 value, u64 *timestamp) 359 { 360 *timestamp = value >> 16; 361 return value & U16_MAX; 362 } 363 364 static __always_inline void irq_timings_push(u64 ts, int irq) 365 { 366 struct irq_timings *timings = this_cpu_ptr(&irq_timings); 367 368 timings->values[timings->count & IRQ_TIMINGS_MASK] = 369 irq_timing_encode(ts, irq); 370 371 timings->count++; 372 } 373 374 /* 375 * The function record_irq_time is only called in one place in the 376 * interrupts handler. We want this function always inline so the code 377 * inside is embedded in the function and the static key branching 378 * code can act at the higher level. Without the explicit 379 * __always_inline we can end up with a function call and a small 380 * overhead in the hotpath for nothing. 381 */ 382 static __always_inline void record_irq_time(struct irq_desc *desc) 383 { 384 if (!static_branch_likely(&irq_timing_enabled)) 385 return; 386 387 if (desc->istate & IRQS_TIMINGS) 388 irq_timings_push(local_clock(), irq_desc_get_irq(desc)); 389 } 390 #else 391 static inline void irq_remove_timings(struct irq_desc *desc) {} 392 static inline void irq_setup_timings(struct irq_desc *desc, 393 struct irqaction *act) {}; 394 static inline void record_irq_time(struct irq_desc *desc) {} 395 #endif /* CONFIG_IRQ_TIMINGS */ 396 397 398 #ifdef CONFIG_GENERIC_IRQ_CHIP 399 void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, 400 int num_ct, unsigned int irq_base, 401 void __iomem *reg_base, irq_flow_handler_t handler); 402 #else 403 static inline void 404 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 #endif /* CONFIG_GENERIC_IRQ_CHIP */ 408 409 #ifdef CONFIG_GENERIC_PENDING_IRQ 410 static inline bool irq_can_move_pcntxt(struct irq_data *data) 411 { 412 return irqd_can_move_in_process_context(data); 413 } 414 static inline bool irq_move_pending(struct irq_data *data) 415 { 416 return irqd_is_setaffinity_pending(data); 417 } 418 static inline void 419 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) 420 { 421 cpumask_copy(desc->pending_mask, mask); 422 } 423 static inline void 424 irq_get_pending(struct cpumask *mask, struct irq_desc *desc) 425 { 426 cpumask_copy(mask, desc->pending_mask); 427 } 428 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) 429 { 430 return desc->pending_mask; 431 } 432 static inline bool handle_enforce_irqctx(struct irq_data *data) 433 { 434 return irqd_is_handle_enforce_irqctx(data); 435 } 436 bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear); 437 #else /* CONFIG_GENERIC_PENDING_IRQ */ 438 static inline bool irq_can_move_pcntxt(struct irq_data *data) 439 { 440 return true; 441 } 442 static inline bool irq_move_pending(struct irq_data *data) 443 { 444 return false; 445 } 446 static inline void 447 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) 448 { 449 } 450 static inline void 451 irq_get_pending(struct cpumask *mask, struct irq_desc *desc) 452 { 453 } 454 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) 455 { 456 return NULL; 457 } 458 static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear) 459 { 460 return false; 461 } 462 static inline bool handle_enforce_irqctx(struct irq_data *data) 463 { 464 return false; 465 } 466 #endif /* !CONFIG_GENERIC_PENDING_IRQ */ 467 468 #if !defined(CONFIG_IRQ_DOMAIN) || !defined(CONFIG_IRQ_DOMAIN_HIERARCHY) 469 static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve) 470 { 471 irqd_set_activated(data); 472 return 0; 473 } 474 static inline void irq_domain_deactivate_irq(struct irq_data *data) 475 { 476 irqd_clr_activated(data); 477 } 478 #endif 479 480 static inline struct irq_data *irqd_get_parent_data(struct irq_data *irqd) 481 { 482 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY 483 return irqd->parent_data; 484 #else 485 return NULL; 486 #endif 487 } 488 489 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS 490 #include <linux/debugfs.h> 491 492 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc); 493 static inline void irq_remove_debugfs_entry(struct irq_desc *desc) 494 { 495 debugfs_remove(desc->debugfs_file); 496 kfree(desc->dev_name); 497 } 498 void irq_debugfs_copy_devname(int irq, struct device *dev); 499 # ifdef CONFIG_IRQ_DOMAIN 500 void irq_domain_debugfs_init(struct dentry *root); 501 # else 502 static inline void irq_domain_debugfs_init(struct dentry *root) 503 { 504 } 505 # endif 506 #else /* CONFIG_GENERIC_IRQ_DEBUGFS */ 507 static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d) 508 { 509 } 510 static inline void irq_remove_debugfs_entry(struct irq_desc *d) 511 { 512 } 513 static inline void irq_debugfs_copy_devname(int irq, struct device *dev) 514 { 515 } 516 #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */ 517