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 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 int __irq_get_irqchip_state(struct irq_data *data,
 101                                    enum irqchip_irq_state which,
 102                                    bool *state);
 103
 104 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
 105
 106 irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags);
 107 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
 108 irqreturn_t handle_irq_event(struct irq_desc *desc);
 109
 110 /* Resending of interrupts :*/
 111 int check_irq_resend(struct irq_desc *desc, bool inject);
 112 bool irq_wait_for_poll(struct irq_desc *desc);
 113 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
 114
 115 #ifdef CONFIG_PROC_FS
 116 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
 117 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
 118 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
 119 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
 120 #else
 121 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 122 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 123 static inline void register_handler_proc(unsigned int irq,
 124                                          struct irqaction *action) { }
 125 static inline void unregister_handler_proc(unsigned int irq,
 126                                            struct irqaction *action) { }
 127 #endif
 128
 129 extern bool irq_can_set_affinity_usr(unsigned int irq);
 130
 131 extern void irq_set_thread_affinity(struct irq_desc *desc);
 132
 133 extern int irq_do_set_affinity(struct irq_data *data,
 134                                const struct cpumask *dest, bool force);
 135
 136 #ifdef CONFIG_SMP
 137 extern int irq_setup_affinity(struct irq_desc *desc);
 138 #else
 139 static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; }
 140 #endif
 141
 142 /* Inline functions for support of irq chips on slow busses */
 143 static inline void chip_bus_lock(struct irq_desc *desc)
 144 {
 145         if (unlikely(desc->irq_data.chip->irq_bus_lock))
 146                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
 147 }
 148
 149 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
 150 {
 151         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
 152                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
 153 }
 154
 155 #define _IRQ_DESC_CHECK         (1 << 0)
 156 #define _IRQ_DESC_PERCPU        (1 << 1)
 157
 158 #define IRQ_GET_DESC_CHECK_GLOBAL       (_IRQ_DESC_CHECK)
 159 #define IRQ_GET_DESC_CHECK_PERCPU       (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
 160
 161 #define for_each_action_of_desc(desc, act)                      \
 162         for (act = desc->action; act; act = act->next)
 163
 164 struct irq_desc *
 165 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
 166                     unsigned int check);
 167 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
 168
 169 static inline struct irq_desc *
 170 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
 171 {
 172         return __irq_get_desc_lock(irq, flags, true, check);
 173 }
 174
 175 static inline void
 176 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
 177 {
 178         __irq_put_desc_unlock(desc, flags, true);
 179 }
 180
 181 static inline struct irq_desc *
 182 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
 183 {
 184         return __irq_get_desc_lock(irq, flags, false, check);
 185 }
 186
 187 static inline void
 188 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
 189 {
 190         __irq_put_desc_unlock(desc, flags, false);
 191 }
 192
 193 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
 194
 195 static inline unsigned int irqd_get(struct irq_data *d)
 196 {
 197         return __irqd_to_state(d);
 198 }
 199
 200 /*
 201  * Manipulation functions for irq_data.state
 202  */
 203 static inline void irqd_set_move_pending(struct irq_data *d)
 204 {
 205         __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
 206 }
 207
 208 static inline void irqd_clr_move_pending(struct irq_data *d)
 209 {
 210         __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
 211 }
 212
 213 static inline void irqd_set_managed_shutdown(struct irq_data *d)
 214 {
 215         __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN;
 216 }
 217
 218 static inline void irqd_clr_managed_shutdown(struct irq_data *d)
 219 {
 220         __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN;
 221 }
 222
 223 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
 224 {
 225         __irqd_to_state(d) &= ~mask;
 226 }
 227
 228 static inline void irqd_set(struct irq_data *d, unsigned int mask)
 229 {
 230         __irqd_to_state(d) |= mask;
 231 }
 232
 233 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
 234 {
 235         return __irqd_to_state(d) & mask;
 236 }
 237
 238 static inline void irq_state_set_disabled(struct irq_desc *desc)
 239 {
 240         irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
 241 }
 242
 243 static inline void irq_state_set_masked(struct irq_desc *desc)
 244 {
 245         irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
 246 }
 247
 248 #undef __irqd_to_state
 249
 250 static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc)
 251 {
 252         __this_cpu_inc(*desc->kstat_irqs);
 253         __this_cpu_inc(kstat.irqs_sum);
 254 }
 255
 256 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
 257 {
 258         __kstat_incr_irqs_this_cpu(desc);
 259         desc->tot_count++;
 260 }
 261
 262 static inline int irq_desc_get_node(struct irq_desc *desc)
 263 {
 264         return irq_common_data_get_node(&desc->irq_common_data);
 265 }
 266
 267 static inline int irq_desc_is_chained(struct irq_desc *desc)
 268 {
 269         return (desc->action && desc->action == &chained_action);
 270 }
 271
 272 #ifdef CONFIG_PM_SLEEP
 273 bool irq_pm_check_wakeup(struct irq_desc *desc);
 274 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
 275 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
 276 #else
 277 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
 278 static inline void
 279 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
 280 static inline void
 281 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
 282 #endif
 283
 284 #ifdef CONFIG_IRQ_TIMINGS
 285
 286 #define IRQ_TIMINGS_SHIFT       5
 287 #define IRQ_TIMINGS_SIZE        (1 << IRQ_TIMINGS_SHIFT)
 288 #define IRQ_TIMINGS_MASK        (IRQ_TIMINGS_SIZE - 1)
 289
 290 /**
 291  * struct irq_timings - irq timings storing structure
 292  * @values: a circular buffer of u64 encoded <timestamp,irq> values
 293  * @count: the number of elements in the array
 294  */
 295 struct irq_timings {
 296         u64     values[IRQ_TIMINGS_SIZE];
 297         int     count;
 298 };
 299
 300 DECLARE_PER_CPU(struct irq_timings, irq_timings);
 301
 302 extern void irq_timings_free(int irq);
 303 extern int irq_timings_alloc(int irq);
 304
 305 static inline void irq_remove_timings(struct irq_desc *desc)
 306 {
 307         desc->istate &= ~IRQS_TIMINGS;
 308
 309         irq_timings_free(irq_desc_get_irq(desc));
 310 }
 311
 312 static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act)
 313 {
 314         int irq = irq_desc_get_irq(desc);
 315         int ret;
 316
 317         /*
 318          * We don't need the measurement because the idle code already
 319          * knows the next expiry event.
 320          */
 321         if (act->flags & __IRQF_TIMER)
 322                 return;
 323
 324         /*
 325          * In case the timing allocation fails, we just want to warn,
 326          * not fail, so letting the system boot anyway.
 327          */
 328         ret = irq_timings_alloc(irq);
 329         if (ret) {
 330                 pr_warn("Failed to allocate irq timing stats for irq%d (%d)",
 331                         irq, ret);
 332                 return;
 333         }
 334
 335         desc->istate |= IRQS_TIMINGS;
 336 }
 337
 338 extern void irq_timings_enable(void);
 339 extern void irq_timings_disable(void);
 340
 341 DECLARE_STATIC_KEY_FALSE(irq_timing_enabled);
 342
 343 /*
 344  * The interrupt number and the timestamp are encoded into a single
 345  * u64 variable to optimize the size.
 346  * 48 bit time stamp and 16 bit IRQ number is way sufficient.
 347  *  Who cares an IRQ after 78 hours of idle time?
 348  */
 349 static inline u64 irq_timing_encode(u64 timestamp, int irq)
 350 {
 351         return (timestamp << 16) | irq;
 352 }
 353
 354 static inline int irq_timing_decode(u64 value, u64 *timestamp)
 355 {
 356         *timestamp = value >> 16;
 357         return value & U16_MAX;
 358 }
 359
 360 static __always_inline void irq_timings_push(u64 ts, int irq)
 361 {
 362         struct irq_timings *timings = this_cpu_ptr(&irq_timings);
 363
 364         timings->values[timings->count & IRQ_TIMINGS_MASK] =
 365                 irq_timing_encode(ts, irq);
 366
 367         timings->count++;
 368 }
 369
 370 /*
 371  * The function record_irq_time is only called in one place in the
 372  * interrupts handler. We want this function always inline so the code
 373  * inside is embedded in the function and the static key branching
 374  * code can act at the higher level. Without the explicit
 375  * __always_inline we can end up with a function call and a small
 376  * overhead in the hotpath for nothing.
 377  */
 378 static __always_inline void record_irq_time(struct irq_desc *desc)
 379 {
 380         if (!static_branch_likely(&irq_timing_enabled))
 381                 return;
 382
 383         if (desc->istate & IRQS_TIMINGS)
 384                 irq_timings_push(local_clock(), irq_desc_get_irq(desc));
 385 }
 386 #else
 387 static inline void irq_remove_timings(struct irq_desc *desc) {}
 388 static inline void irq_setup_timings(struct irq_desc *desc,
 389                                      struct irqaction *act) {};
 390 static inline void record_irq_time(struct irq_desc *desc) {}
 391 #endif /* CONFIG_IRQ_TIMINGS */
 392
 393
 394 #ifdef CONFIG_GENERIC_IRQ_CHIP
 395 void 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 #else
 399 static inline void
 400 irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
 401                       int num_ct, unsigned int irq_base,
 402                       void __iomem *reg_base, irq_flow_handler_t handler) { }
 403 #endif /* CONFIG_GENERIC_IRQ_CHIP */
 404
 405 #ifdef CONFIG_GENERIC_PENDING_IRQ
 406 static inline bool irq_can_move_pcntxt(struct irq_data *data)
 407 {
 408         return irqd_can_move_in_process_context(data);
 409 }
 410 static inline bool irq_move_pending(struct irq_data *data)
 411 {
 412         return irqd_is_setaffinity_pending(data);
 413 }
 414 static inline void
 415 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
 416 {
 417         cpumask_copy(desc->pending_mask, mask);
 418 }
 419 static inline void
 420 irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
 421 {
 422         cpumask_copy(mask, desc->pending_mask);
 423 }
 424 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
 425 {
 426         return desc->pending_mask;
 427 }
 428 static inline bool handle_enforce_irqctx(struct irq_data *data)
 429 {
 430         return irqd_is_handle_enforce_irqctx(data);
 431 }
 432 bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear);
 433 #else /* CONFIG_GENERIC_PENDING_IRQ */
 434 static inline bool irq_can_move_pcntxt(struct irq_data *data)
 435 {
 436         return true;
 437 }
 438 static inline bool irq_move_pending(struct irq_data *data)
 439 {
 440         return false;
 441 }
 442 static inline void
 443 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
 444 {
 445 }
 446 static inline void
 447 irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
 448 {
 449 }
 450 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
 451 {
 452         return NULL;
 453 }
 454 static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
 455 {
 456         return false;
 457 }
 458 static inline bool handle_enforce_irqctx(struct irq_data *data)
 459 {
 460         return false;
 461 }
 462 #endif /* !CONFIG_GENERIC_PENDING_IRQ */
 463
 464 #if !defined(CONFIG_IRQ_DOMAIN) || !defined(CONFIG_IRQ_DOMAIN_HIERARCHY)
 465 static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve)
 466 {
 467         irqd_set_activated(data);
 468         return 0;
 469 }
 470 static inline void irq_domain_deactivate_irq(struct irq_data *data)
 471 {
 472         irqd_clr_activated(data);
 473 }
 474 #endif
 475
 476 static inline struct irq_data *irqd_get_parent_data(struct irq_data *irqd)
 477 {
 478 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
 479         return irqd->parent_data;
 480 #else
 481         return NULL;
 482 #endif
 483 }
 484
 485 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
 486 #include <linux/debugfs.h>
 487
 488 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc);
 489 static inline void irq_remove_debugfs_entry(struct irq_desc *desc)
 490 {
 491         debugfs_remove(desc->debugfs_file);
 492         kfree(desc->dev_name);
 493 }
 494 void irq_debugfs_copy_devname(int irq, struct device *dev);
 495 # ifdef CONFIG_IRQ_DOMAIN
 496 void irq_domain_debugfs_init(struct dentry *root);
 497 # else
 498 static inline void irq_domain_debugfs_init(struct dentry *root)
 499 {
 500 }
 501 # endif
 502 #else /* CONFIG_GENERIC_IRQ_DEBUGFS */
 503 static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d)
 504 {
 505 }
 506 static inline void irq_remove_debugfs_entry(struct irq_desc *d)
 507 {
 508 }
 509 static inline void irq_debugfs_copy_devname(int irq, struct device *dev)
 510 {
 511 }
 512 #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */