1 /* 2 * IRQ subsystem internal functions and variables: 3 * 4 * Do not ever include this file from anything else than 5 * kernel/irq/. Do not even think about using any information outside 6 * of this file for your non core code. 7 */ 8 #include <linux/irqdesc.h> 9 #include <linux/kernel_stat.h> 10 #include <linux/pm_runtime.h> 11 #include <linux/sched/clock.h> 12 13 #ifdef CONFIG_SPARSE_IRQ 14 # define IRQ_BITMAP_BITS (NR_IRQS + 8196) 15 #else 16 # define IRQ_BITMAP_BITS NR_IRQS 17 #endif 18 19 #define istate core_internal_state__do_not_mess_with_it 20 21 extern bool noirqdebug; 22 23 extern struct irqaction chained_action; 24 25 /* 26 * Bits used by threaded handlers: 27 * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run 28 * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed 29 * IRQTF_AFFINITY - irq thread is requested to adjust affinity 30 * IRQTF_FORCED_THREAD - irq action is force threaded 31 */ 32 enum { 33 IRQTF_RUNTHREAD, 34 IRQTF_WARNED, 35 IRQTF_AFFINITY, 36 IRQTF_FORCED_THREAD, 37 }; 38 39 /* 40 * Bit masks for desc->core_internal_state__do_not_mess_with_it 41 * 42 * IRQS_AUTODETECT - autodetection in progress 43 * IRQS_SPURIOUS_DISABLED - was disabled due to spurious interrupt 44 * detection 45 * IRQS_POLL_INPROGRESS - polling in progress 46 * IRQS_ONESHOT - irq is not unmasked in primary handler 47 * IRQS_REPLAY - irq is replayed 48 * IRQS_WAITING - irq is waiting 49 * IRQS_PENDING - irq is pending and replayed later 50 * IRQS_SUSPENDED - irq is suspended 51 */ 52 enum { 53 IRQS_AUTODETECT = 0x00000001, 54 IRQS_SPURIOUS_DISABLED = 0x00000002, 55 IRQS_POLL_INPROGRESS = 0x00000008, 56 IRQS_ONESHOT = 0x00000020, 57 IRQS_REPLAY = 0x00000040, 58 IRQS_WAITING = 0x00000080, 59 IRQS_PENDING = 0x00000200, 60 IRQS_SUSPENDED = 0x00000800, 61 IRQS_TIMINGS = 0x00001000, 62 }; 63 64 #include "debug.h" 65 #include "settings.h" 66 67 extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags); 68 extern void __disable_irq(struct irq_desc *desc); 69 extern void __enable_irq(struct irq_desc *desc); 70 71 #define IRQ_RESEND true 72 #define IRQ_NORESEND false 73 74 #define IRQ_START_FORCE true 75 #define IRQ_START_COND false 76 77 extern int irq_startup(struct irq_desc *desc, bool resend, bool force); 78 79 extern void irq_shutdown(struct irq_desc *desc); 80 extern void irq_enable(struct irq_desc *desc); 81 extern void irq_disable(struct irq_desc *desc); 82 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu); 83 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu); 84 extern void mask_irq(struct irq_desc *desc); 85 extern void unmask_irq(struct irq_desc *desc); 86 extern void unmask_threaded_irq(struct irq_desc *desc); 87 88 #ifdef CONFIG_SPARSE_IRQ 89 static inline void irq_mark_irq(unsigned int irq) { } 90 #else 91 extern void irq_mark_irq(unsigned int irq); 92 #endif 93 94 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr); 95 96 irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags); 97 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc); 98 irqreturn_t handle_irq_event(struct irq_desc *desc); 99 100 /* Resending of interrupts :*/ 101 void check_irq_resend(struct irq_desc *desc); 102 bool irq_wait_for_poll(struct irq_desc *desc); 103 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action); 104 105 #ifdef CONFIG_PROC_FS 106 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); 107 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc); 108 extern void register_handler_proc(unsigned int irq, struct irqaction *action); 109 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action); 110 #else 111 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { } 112 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { } 113 static inline void register_handler_proc(unsigned int irq, 114 struct irqaction *action) { } 115 static inline void unregister_handler_proc(unsigned int irq, 116 struct irqaction *action) { } 117 #endif 118 119 extern bool irq_can_set_affinity_usr(unsigned int irq); 120 121 extern int irq_select_affinity_usr(unsigned int irq); 122 123 extern void irq_set_thread_affinity(struct irq_desc *desc); 124 125 extern int irq_do_set_affinity(struct irq_data *data, 126 const struct cpumask *dest, bool force); 127 128 #ifdef CONFIG_SMP 129 extern int irq_setup_affinity(struct irq_desc *desc); 130 #else 131 static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; } 132 #endif 133 134 /* Inline functions for support of irq chips on slow busses */ 135 static inline void chip_bus_lock(struct irq_desc *desc) 136 { 137 if (unlikely(desc->irq_data.chip->irq_bus_lock)) 138 desc->irq_data.chip->irq_bus_lock(&desc->irq_data); 139 } 140 141 static inline void chip_bus_sync_unlock(struct irq_desc *desc) 142 { 143 if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock)) 144 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data); 145 } 146 147 #define _IRQ_DESC_CHECK (1 << 0) 148 #define _IRQ_DESC_PERCPU (1 << 1) 149 150 #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK) 151 #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU) 152 153 #define for_each_action_of_desc(desc, act) \ 154 for (act = desc->act; act; act = act->next) 155 156 struct irq_desc * 157 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, 158 unsigned int check); 159 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus); 160 161 static inline struct irq_desc * 162 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check) 163 { 164 return __irq_get_desc_lock(irq, flags, true, check); 165 } 166 167 static inline void 168 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags) 169 { 170 __irq_put_desc_unlock(desc, flags, true); 171 } 172 173 static inline struct irq_desc * 174 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check) 175 { 176 return __irq_get_desc_lock(irq, flags, false, check); 177 } 178 179 static inline void 180 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags) 181 { 182 __irq_put_desc_unlock(desc, flags, false); 183 } 184 185 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors) 186 187 static inline unsigned int irqd_get(struct irq_data *d) 188 { 189 return __irqd_to_state(d); 190 } 191 192 /* 193 * Manipulation functions for irq_data.state 194 */ 195 static inline void irqd_set_move_pending(struct irq_data *d) 196 { 197 __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING; 198 } 199 200 static inline void irqd_clr_move_pending(struct irq_data *d) 201 { 202 __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING; 203 } 204 205 static inline void irqd_set_managed_shutdown(struct irq_data *d) 206 { 207 __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN; 208 } 209 210 static inline void irqd_clr_managed_shutdown(struct irq_data *d) 211 { 212 __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN; 213 } 214 215 static inline void irqd_clear(struct irq_data *d, unsigned int mask) 216 { 217 __irqd_to_state(d) &= ~mask; 218 } 219 220 static inline void irqd_set(struct irq_data *d, unsigned int mask) 221 { 222 __irqd_to_state(d) |= mask; 223 } 224 225 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) 226 { 227 return __irqd_to_state(d) & mask; 228 } 229 230 #undef __irqd_to_state 231 232 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc) 233 { 234 __this_cpu_inc(*desc->kstat_irqs); 235 __this_cpu_inc(kstat.irqs_sum); 236 } 237 238 static inline int irq_desc_get_node(struct irq_desc *desc) 239 { 240 return irq_common_data_get_node(&desc->irq_common_data); 241 } 242 243 static inline int irq_desc_is_chained(struct irq_desc *desc) 244 { 245 return (desc->action && desc->action == &chained_action); 246 } 247 248 #ifdef CONFIG_PM_SLEEP 249 bool irq_pm_check_wakeup(struct irq_desc *desc); 250 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action); 251 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action); 252 #else 253 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; } 254 static inline void 255 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { } 256 static inline void 257 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { } 258 #endif 259 260 #ifdef CONFIG_IRQ_TIMINGS 261 262 #define IRQ_TIMINGS_SHIFT 5 263 #define IRQ_TIMINGS_SIZE (1 << IRQ_TIMINGS_SHIFT) 264 #define IRQ_TIMINGS_MASK (IRQ_TIMINGS_SIZE - 1) 265 266 /** 267 * struct irq_timings - irq timings storing structure 268 * @values: a circular buffer of u64 encoded <timestamp,irq> values 269 * @count: the number of elements in the array 270 */ 271 struct irq_timings { 272 u64 values[IRQ_TIMINGS_SIZE]; 273 int count; 274 }; 275 276 DECLARE_PER_CPU(struct irq_timings, irq_timings); 277 278 extern void irq_timings_free(int irq); 279 extern int irq_timings_alloc(int irq); 280 281 static inline void irq_remove_timings(struct irq_desc *desc) 282 { 283 desc->istate &= ~IRQS_TIMINGS; 284 285 irq_timings_free(irq_desc_get_irq(desc)); 286 } 287 288 static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act) 289 { 290 int irq = irq_desc_get_irq(desc); 291 int ret; 292 293 /* 294 * We don't need the measurement because the idle code already 295 * knows the next expiry event. 296 */ 297 if (act->flags & __IRQF_TIMER) 298 return; 299 300 /* 301 * In case the timing allocation fails, we just want to warn, 302 * not fail, so letting the system boot anyway. 303 */ 304 ret = irq_timings_alloc(irq); 305 if (ret) { 306 pr_warn("Failed to allocate irq timing stats for irq%d (%d)", 307 irq, ret); 308 return; 309 } 310 311 desc->istate |= IRQS_TIMINGS; 312 } 313 314 extern void irq_timings_enable(void); 315 extern void irq_timings_disable(void); 316 317 DECLARE_STATIC_KEY_FALSE(irq_timing_enabled); 318 319 /* 320 * The interrupt number and the timestamp are encoded into a single 321 * u64 variable to optimize the size. 322 * 48 bit time stamp and 16 bit IRQ number is way sufficient. 323 * Who cares an IRQ after 78 hours of idle time? 324 */ 325 static inline u64 irq_timing_encode(u64 timestamp, int irq) 326 { 327 return (timestamp << 16) | irq; 328 } 329 330 static inline int irq_timing_decode(u64 value, u64 *timestamp) 331 { 332 *timestamp = value >> 16; 333 return value & U16_MAX; 334 } 335 336 /* 337 * The function record_irq_time is only called in one place in the 338 * interrupts handler. We want this function always inline so the code 339 * inside is embedded in the function and the static key branching 340 * code can act at the higher level. Without the explicit 341 * __always_inline we can end up with a function call and a small 342 * overhead in the hotpath for nothing. 343 */ 344 static __always_inline void record_irq_time(struct irq_desc *desc) 345 { 346 if (!static_branch_likely(&irq_timing_enabled)) 347 return; 348 349 if (desc->istate & IRQS_TIMINGS) { 350 struct irq_timings *timings = this_cpu_ptr(&irq_timings); 351 352 timings->values[timings->count & IRQ_TIMINGS_MASK] = 353 irq_timing_encode(local_clock(), 354 irq_desc_get_irq(desc)); 355 356 timings->count++; 357 } 358 } 359 #else 360 static inline void irq_remove_timings(struct irq_desc *desc) {} 361 static inline void irq_setup_timings(struct irq_desc *desc, 362 struct irqaction *act) {}; 363 static inline void record_irq_time(struct irq_desc *desc) {} 364 #endif /* CONFIG_IRQ_TIMINGS */ 365 366 367 #ifdef CONFIG_GENERIC_IRQ_CHIP 368 void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, 369 int num_ct, unsigned int irq_base, 370 void __iomem *reg_base, irq_flow_handler_t handler); 371 #else 372 static inline void 373 irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, 374 int num_ct, unsigned int irq_base, 375 void __iomem *reg_base, irq_flow_handler_t handler) { } 376 #endif /* CONFIG_GENERIC_IRQ_CHIP */ 377 378 #ifdef CONFIG_GENERIC_PENDING_IRQ 379 static inline bool irq_can_move_pcntxt(struct irq_data *data) 380 { 381 return irqd_can_move_in_process_context(data); 382 } 383 static inline bool irq_move_pending(struct irq_data *data) 384 { 385 return irqd_is_setaffinity_pending(data); 386 } 387 static inline void 388 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) 389 { 390 cpumask_copy(desc->pending_mask, mask); 391 } 392 static inline void 393 irq_get_pending(struct cpumask *mask, struct irq_desc *desc) 394 { 395 cpumask_copy(mask, desc->pending_mask); 396 } 397 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) 398 { 399 return desc->pending_mask; 400 } 401 bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear); 402 #else /* CONFIG_GENERIC_PENDING_IRQ */ 403 static inline bool irq_can_move_pcntxt(struct irq_data *data) 404 { 405 return true; 406 } 407 static inline bool irq_move_pending(struct irq_data *data) 408 { 409 return false; 410 } 411 static inline void 412 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) 413 { 414 } 415 static inline void 416 irq_get_pending(struct cpumask *mask, struct irq_desc *desc) 417 { 418 } 419 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) 420 { 421 return NULL; 422 } 423 static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear) 424 { 425 return false; 426 } 427 #endif /* !CONFIG_GENERIC_PENDING_IRQ */ 428 429 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS 430 #include <linux/debugfs.h> 431 432 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc); 433 static inline void irq_remove_debugfs_entry(struct irq_desc *desc) 434 { 435 debugfs_remove(desc->debugfs_file); 436 } 437 # ifdef CONFIG_IRQ_DOMAIN 438 void irq_domain_debugfs_init(struct dentry *root); 439 # else 440 static inline void irq_domain_debugfs_init(struct dentry *root) 441 { 442 } 443 # endif 444 #else /* CONFIG_GENERIC_IRQ_DEBUGFS */ 445 static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d) 446 { 447 } 448 static inline void irq_remove_debugfs_entry(struct irq_desc *d) 449 { 450 } 451 #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */ 452