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