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