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