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