kernel/irq/internals.h

   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 MAX_SPARSE_IRQS        INT_MAX
  16 #else
  17 # define MAX_SPARSE_IRQS        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  * IRQTF_READY     - signals that irq thread is ready
  33  */
  34 enum {
  35         IRQTF_RUNTHREAD,
  36         IRQTF_WARNED,
  37         IRQTF_AFFINITY,
  38         IRQTF_FORCED_THREAD,
  39         IRQTF_READY,
  40 };
  41
  42 /*
  43  * Bit masks for desc->core_internal_state__do_not_mess_with_it
  44  *
  45  * IRQS_AUTODETECT              - autodetection in progress
  46  * IRQS_SPURIOUS_DISABLED       - was disabled due to spurious interrupt
  47  *                                detection
  48  * IRQS_POLL_INPROGRESS         - polling in progress
  49  * IRQS_ONESHOT                 - irq is not unmasked in primary handler
  50  * IRQS_REPLAY                  - irq has been resent and will not be resent
  51  *                                again until the handler has run and cleared
  52  *                                this flag.
  53  * IRQS_WAITING                 - irq is waiting
  54  * IRQS_PENDING                 - irq needs to be resent and should be resent
  55  *                                at the next available opportunity.
  56  * IRQS_SUSPENDED               - irq is suspended
  57  * IRQS_NMI                     - irq line is used to deliver NMIs
  58  * IRQS_SYSFS                   - descriptor has been added to sysfs
  59  */
  60 enum {
  61         IRQS_AUTODETECT         = 0x00000001,
  62         IRQS_SPURIOUS_DISABLED  = 0x00000002,
  63         IRQS_POLL_INPROGRESS    = 0x00000008,
  64         IRQS_ONESHOT            = 0x00000020,
  65         IRQS_REPLAY             = 0x00000040,
  66         IRQS_WAITING            = 0x00000080,
  67         IRQS_PENDING            = 0x00000200,
  68         IRQS_SUSPENDED          = 0x00000800,
  69         IRQS_TIMINGS            = 0x00001000,
  70         IRQS_NMI                = 0x00002000,
  71         IRQS_SYSFS              = 0x00004000,
  72 };
  73
  74 #include "debug.h"
  75 #include "settings.h"
  76
  77 extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
  78 extern void __disable_irq(struct irq_desc *desc);
  79 extern void __enable_irq(struct irq_desc *desc);
  80
  81 #define IRQ_RESEND      true
  82 #define IRQ_NORESEND    false
  83
  84 #define IRQ_START_FORCE true
  85 #define IRQ_START_COND  false
  86
  87 extern int irq_activate(struct irq_desc *desc);
  88 extern int irq_activate_and_startup(struct irq_desc *desc, bool resend);
  89 extern int irq_startup(struct irq_desc *desc, bool resend, bool force);
  90
  91 extern void irq_shutdown(struct irq_desc *desc);
  92 extern void irq_shutdown_and_deactivate(struct irq_desc *desc);
  93 extern void irq_enable(struct irq_desc *desc);
  94 extern void irq_disable(struct irq_desc *desc);
  95 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
  96 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
  97 extern void mask_irq(struct irq_desc *desc);
  98 extern void unmask_irq(struct irq_desc *desc);
  99 extern void unmask_threaded_irq(struct irq_desc *desc);
 100
 101 extern unsigned int kstat_irqs_desc(struct irq_desc *desc, const struct cpumask *cpumask);
 102
 103 #ifdef CONFIG_SPARSE_IRQ
 104 static inline void irq_mark_irq(unsigned int irq) { }
 105 #else
 106 extern void irq_mark_irq(unsigned int irq);
 107 #endif
 108
 109 extern int __irq_get_irqchip_state(struct irq_data *data,
 110                                    enum irqchip_irq_state which,
 111                                    bool *state);
 112
 113 irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc);
 114 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
 115 irqreturn_t handle_irq_event(struct irq_desc *desc);
 116
 117 /* Resending of interrupts :*/
 118 int check_irq_resend(struct irq_desc *desc, bool inject);
 119 void clear_irq_resend(struct irq_desc *desc);
 120 void irq_resend_init(struct irq_desc *desc);
 121 bool irq_wait_for_poll(struct irq_desc *desc);
 122 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
 123
 124 void wake_threads_waitq(struct irq_desc *desc);
 125
 126 #ifdef CONFIG_PROC_FS
 127 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
 128 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
 129 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
 130 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
 131 #else
 132 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 133 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 134 static inline void register_handler_proc(unsigned int irq,
 135                                          struct irqaction *action) { }
 136 static inline void unregister_handler_proc(unsigned int irq,
 137                                            struct irqaction *action) { }
 138 #endif
 139
 140 extern bool irq_can_set_affinity_usr(unsigned int irq);
 141
 142 extern void irq_set_thread_affinity(struct irq_desc *desc);
 143
 144 extern int irq_do_set_affinity(struct irq_data *data,
 145                                const struct cpumask *dest, bool force);
 146
 147 #ifdef CONFIG_SMP
 148 extern int irq_setup_affinity(struct irq_desc *desc);
 149 #else
 150 static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; }
 151 #endif
 152
 153 /* Inline functions for support of irq chips on slow busses */
 154 static inline void chip_bus_lock(struct irq_desc *desc)
 155 {
 156         if (unlikely(desc->irq_data.chip->irq_bus_lock))
 157                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
 158 }
 159
 160 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
 161 {
 162         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
 163                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
 164 }
 165
 166 #define _IRQ_DESC_CHECK         (1 << 0)
 167 #define _IRQ_DESC_PERCPU        (1 << 1)
 168
 169 #define IRQ_GET_DESC_CHECK_GLOBAL       (_IRQ_DESC_CHECK)
 170 #define IRQ_GET_DESC_CHECK_PERCPU       (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
 171
 172 #define for_each_action_of_desc(desc, act)                      \
 173         for (act = desc->action; act; act = act->next)
 174
 175 struct irq_desc *
 176 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
 177                     unsigned int check);
 178 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
 179
 180 static inline struct irq_desc *
 181 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
 182 {
 183         return __irq_get_desc_lock(irq, flags, true, check);
 184 }
 185
 186 static inline void
 187 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
 188 {
 189         __irq_put_desc_unlock(desc, flags, true);
 190 }
 191
 192 static inline struct irq_desc *
 193 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
 194 {
 195         return __irq_get_desc_lock(irq, flags, false, check);
 196 }
 197
 198 static inline void
 199 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
 200 {
 201         __irq_put_desc_unlock(desc, flags, false);
 202 }
 203
 204 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
 205
 206 static inline unsigned int irqd_get(struct irq_data *d)
 207 {
 208         return __irqd_to_state(d);
 209 }
 210
 211 /*
 212  * Manipulation functions for irq_data.state
 213  */
 214 static inline void irqd_set_move_pending(struct irq_data *d)
 215 {
 216         __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
 217 }
 218
 219 static inline void irqd_clr_move_pending(struct irq_data *d)
 220 {
 221         __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
 222 }
 223
 224 static inline void irqd_set_managed_shutdown(struct irq_data *d)
 225 {
 226         __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN;
 227 }
 228
 229 static inline void irqd_clr_managed_shutdown(struct irq_data *d)
 230 {
 231         __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN;
 232 }
 233
 234 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
 235 {
 236         __irqd_to_state(d) &= ~mask;
 237 }
 238
 239 static inline void irqd_set(struct irq_data *d, unsigned int mask)
 240 {
 241         __irqd_to_state(d) |= mask;
 242 }
 243
 244 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
 245 {
 246         return __irqd_to_state(d) & mask;
 247 }
 248
 249 static inline void irq_state_set_disabled(struct irq_desc *desc)
 250 {
 251         irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
 252 }
 253
 254 static inline void irq_state_set_masked(struct irq_desc *desc)
 255 {
 256         irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
 257 }
 258
 259 #undef __irqd_to_state
 260
 261 static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc)
 262 {
 263         __this_cpu_inc(desc->kstat_irqs->cnt);
 264         __this_cpu_inc(kstat.irqs_sum);
 265 }
 266
 267 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
 268 {
 269         __kstat_incr_irqs_this_cpu(desc);
 270         desc->tot_count++;
 271 }
 272
 273 static inline int irq_desc_get_node(struct irq_desc *desc)
 274 {
 275         return irq_common_data_get_node(&desc->irq_common_data);
 276 }
 277
 278 static inline int irq_desc_is_chained(struct irq_desc *desc)
 279 {
 280         return (desc->action && desc->action == &chained_action);
 281 }
 282
 283 static inline bool irq_is_nmi(struct irq_desc *desc)
 284 {
 285         return desc->istate & IRQS_NMI;
 286 }
 287
 288 #ifdef CONFIG_PM_SLEEP
 289 bool irq_pm_check_wakeup(struct irq_desc *desc);
 290 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
 291 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
 292 #else
 293 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
 294 static inline void
 295 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
 296 static inline void
 297 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
 298 #endif
 299
 300 #ifdef CONFIG_IRQ_TIMINGS
 301
 302 #define IRQ_TIMINGS_SHIFT       5
 303 #define IRQ_TIMINGS_SIZE        (1 << IRQ_TIMINGS_SHIFT)
 304 #define IRQ_TIMINGS_MASK        (IRQ_TIMINGS_SIZE - 1)
 305
 306 /**
 307  * struct irq_timings - irq timings storing structure
 308  * @values: a circular buffer of u64 encoded <timestamp,irq> values
 309  * @count: the number of elements in the array
 310  */
 311 struct irq_timings {
 312         u64     values[IRQ_TIMINGS_SIZE];
 313         int     count;
 314 };
 315
 316 DECLARE_PER_CPU(struct irq_timings, irq_timings);
 317
 318 extern void irq_timings_free(int irq);
 319 extern int irq_timings_alloc(int irq);
 320
 321 static inline void irq_remove_timings(struct irq_desc *desc)
 322 {
 323         desc->istate &= ~IRQS_TIMINGS;
 324
 325         irq_timings_free(irq_desc_get_irq(desc));
 326 }
 327
 328 static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act)
 329 {
 330         int irq = irq_desc_get_irq(desc);
 331         int ret;
 332
 333         /*
 334          * We don't need the measurement because the idle code already
 335          * knows the next expiry event.
 336          */
 337         if (act->flags & __IRQF_TIMER)
 338                 return;
 339
 340         /*
 341          * In case the timing allocation fails, we just want to warn,
 342          * not fail, so letting the system boot anyway.
 343          */
 344         ret = irq_timings_alloc(irq);
 345         if (ret) {
 346                 pr_warn("Failed to allocate irq timing stats for irq%d (%d)",
 347                         irq, ret);
 348                 return;
 349         }
 350
 351         desc->istate |= IRQS_TIMINGS;
 352 }
 353
 354 extern void irq_timings_enable(void);
 355 extern void irq_timings_disable(void);
 356
 357 DECLARE_STATIC_KEY_FALSE(irq_timing_enabled);
 358
 359 /*
 360  * The interrupt number and the timestamp are encoded into a single
 361  * u64 variable to optimize the size.
 362  * 48 bit time stamp and 16 bit IRQ number is way sufficient.
 363  *  Who cares an IRQ after 78 hours of idle time?
 364  */
 365 static inline u64 irq_timing_encode(u64 timestamp, int irq)
 366 {
 367         return (timestamp << 16) | irq;
 368 }
 369
 370 static inline int irq_timing_decode(u64 value, u64 *timestamp)
 371 {
 372         *timestamp = value >> 16;
 373         return value & U16_MAX;
 374 }
 375
 376 static __always_inline void irq_timings_push(u64 ts, int irq)
 377 {
 378         struct irq_timings *timings = this_cpu_ptr(&irq_timings);
 379
 380         timings->values[timings->count & IRQ_TIMINGS_MASK] =
 381                 irq_timing_encode(ts, irq);
 382
 383         timings->count++;
 384 }
 385
 386 /*
 387  * The function record_irq_time is only called in one place in the
 388  * interrupts handler. We want this function always inline so the code
 389  * inside is embedded in the function and the static key branching
 390  * code can act at the higher level. Without the explicit
 391  * __always_inline we can end up with a function call and a small
 392  * overhead in the hotpath for nothing.
 393  */
 394 static __always_inline void record_irq_time(struct irq_desc *desc)
 395 {
 396         if (!static_branch_likely(&irq_timing_enabled))
 397                 return;
 398
 399         if (desc->istate & IRQS_TIMINGS)
 400                 irq_timings_push(local_clock(), irq_desc_get_irq(desc));
 401 }
 402 #else
 403 static inline void irq_remove_timings(struct irq_desc *desc) {}
 404 static inline void irq_setup_timings(struct irq_desc *desc,
 405                                      struct irqaction *act) {};
 406 static inline void record_irq_time(struct irq_desc *desc) {}
 407 #endif /* CONFIG_IRQ_TIMINGS */
 408
 409
 410 #ifdef CONFIG_GENERIC_IRQ_CHIP
 411 void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
 412                            int num_ct, unsigned int irq_base,
 413                            void __iomem *reg_base, irq_flow_handler_t handler);
 414 #else
 415 static inline void
 416 irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
 417                       int num_ct, unsigned int irq_base,
 418                       void __iomem *reg_base, irq_flow_handler_t handler) { }
 419 #endif /* CONFIG_GENERIC_IRQ_CHIP */
 420
 421 #ifdef CONFIG_GENERIC_PENDING_IRQ
 422 static inline bool irq_can_move_pcntxt(struct irq_data *data)
 423 {
 424         return irqd_can_move_in_process_context(data);
 425 }
 426 static inline bool irq_move_pending(struct irq_data *data)
 427 {
 428         return irqd_is_setaffinity_pending(data);
 429 }
 430 static inline void
 431 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
 432 {
 433         cpumask_copy(desc->pending_mask, mask);
 434 }
 435 static inline void
 436 irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
 437 {
 438         cpumask_copy(mask, desc->pending_mask);
 439 }
 440 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
 441 {
 442         return desc->pending_mask;
 443 }
 444 static inline bool handle_enforce_irqctx(struct irq_data *data)
 445 {
 446         return irqd_is_handle_enforce_irqctx(data);
 447 }
 448 bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear);
 449 #else /* CONFIG_GENERIC_PENDING_IRQ */
 450 static inline bool irq_can_move_pcntxt(struct irq_data *data)
 451 {
 452         return true;
 453 }
 454 static inline bool irq_move_pending(struct irq_data *data)
 455 {
 456         return false;
 457 }
 458 static inline void
 459 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
 460 {
 461 }
 462 static inline void
 463 irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
 464 {
 465 }
 466 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
 467 {
 468         return NULL;
 469 }
 470 static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
 471 {
 472         return false;
 473 }
 474 static inline bool handle_enforce_irqctx(struct irq_data *data)
 475 {
 476         return false;
 477 }
 478 #endif /* !CONFIG_GENERIC_PENDING_IRQ */
 479
 480 #if !defined(CONFIG_IRQ_DOMAIN) || !defined(CONFIG_IRQ_DOMAIN_HIERARCHY)
 481 static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve)
 482 {
 483         irqd_set_activated(data);
 484         return 0;
 485 }
 486 static inline void irq_domain_deactivate_irq(struct irq_data *data)
 487 {
 488         irqd_clr_activated(data);
 489 }
 490 #endif
 491
 492 static inline struct irq_data *irqd_get_parent_data(struct irq_data *irqd)
 493 {
 494 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
 495         return irqd->parent_data;
 496 #else
 497         return NULL;
 498 #endif
 499 }
 500
 501 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
 502 #include <linux/debugfs.h>
 503
 504 struct irq_bit_descr {
 505         unsigned int    mask;
 506         char            *name;
 507 };
 508
 509 #define BIT_MASK_DESCR(m)       { .mask = m, .name = #m }
 510
 511 void irq_debug_show_bits(struct seq_file *m, int ind, unsigned int state,
 512                          const struct irq_bit_descr *sd, int size);
 513
 514 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc);
 515 static inline void irq_remove_debugfs_entry(struct irq_desc *desc)
 516 {
 517         debugfs_remove(desc->debugfs_file);
 518         kfree(desc->dev_name);
 519 }
 520 void irq_debugfs_copy_devname(int irq, struct device *dev);
 521 # ifdef CONFIG_IRQ_DOMAIN
 522 void irq_domain_debugfs_init(struct dentry *root);
 523 # else
 524 static inline void irq_domain_debugfs_init(struct dentry *root)
 525 {
 526 }
 527 # endif
 528 #else /* CONFIG_GENERIC_IRQ_DEBUGFS */
 529 static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d)
 530 {
 531 }
 532 static inline void irq_remove_debugfs_entry(struct irq_desc *d)
 533 {
 534 }
 535 static inline void irq_debugfs_copy_devname(int irq, struct device *dev)
 536 {
 537 }
 538 #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */