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