kernel/irq/internals.h

   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 static inline void irq_state_set_disabled(struct irq_desc *desc)
 231 {
 232         irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
 233 }
 234
 235 static inline void irq_state_set_masked(struct irq_desc *desc)
 236 {
 237         irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
 238 }
 239
 240 #undef __irqd_to_state
 241
 242 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
 243 {
 244         __this_cpu_inc(*desc->kstat_irqs);
 245         __this_cpu_inc(kstat.irqs_sum);
 246 }
 247
 248 static inline int irq_desc_get_node(struct irq_desc *desc)
 249 {
 250         return irq_common_data_get_node(&desc->irq_common_data);
 251 }
 252
 253 static inline int irq_desc_is_chained(struct irq_desc *desc)
 254 {
 255         return (desc->action && desc->action == &chained_action);
 256 }
 257
 258 #ifdef CONFIG_PM_SLEEP
 259 bool irq_pm_check_wakeup(struct irq_desc *desc);
 260 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
 261 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
 262 #else
 263 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
 264 static inline void
 265 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
 266 static inline void
 267 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
 268 #endif
 269
 270 #ifdef CONFIG_IRQ_TIMINGS
 271
 272 #define IRQ_TIMINGS_SHIFT       5
 273 #define IRQ_TIMINGS_SIZE        (1 << IRQ_TIMINGS_SHIFT)
 274 #define IRQ_TIMINGS_MASK        (IRQ_TIMINGS_SIZE - 1)
 275
 276 /**
 277  * struct irq_timings - irq timings storing structure
 278  * @values: a circular buffer of u64 encoded <timestamp,irq> values
 279  * @count: the number of elements in the array
 280  */
 281 struct irq_timings {
 282         u64     values[IRQ_TIMINGS_SIZE];
 283         int     count;
 284 };
 285
 286 DECLARE_PER_CPU(struct irq_timings, irq_timings);
 287
 288 extern void irq_timings_free(int irq);
 289 extern int irq_timings_alloc(int irq);
 290
 291 static inline void irq_remove_timings(struct irq_desc *desc)
 292 {
 293         desc->istate &= ~IRQS_TIMINGS;
 294
 295         irq_timings_free(irq_desc_get_irq(desc));
 296 }
 297
 298 static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act)
 299 {
 300         int irq = irq_desc_get_irq(desc);
 301         int ret;
 302
 303         /*
 304          * We don't need the measurement because the idle code already
 305          * knows the next expiry event.
 306          */
 307         if (act->flags & __IRQF_TIMER)
 308                 return;
 309
 310         /*
 311          * In case the timing allocation fails, we just want to warn,
 312          * not fail, so letting the system boot anyway.
 313          */
 314         ret = irq_timings_alloc(irq);
 315         if (ret) {
 316                 pr_warn("Failed to allocate irq timing stats for irq%d (%d)",
 317                         irq, ret);
 318                 return;
 319         }
 320
 321         desc->istate |= IRQS_TIMINGS;
 322 }
 323
 324 extern void irq_timings_enable(void);
 325 extern void irq_timings_disable(void);
 326
 327 DECLARE_STATIC_KEY_FALSE(irq_timing_enabled);
 328
 329 /*
 330  * The interrupt number and the timestamp are encoded into a single
 331  * u64 variable to optimize the size.
 332  * 48 bit time stamp and 16 bit IRQ number is way sufficient.
 333  *  Who cares an IRQ after 78 hours of idle time?
 334  */
 335 static inline u64 irq_timing_encode(u64 timestamp, int irq)
 336 {
 337         return (timestamp << 16) | irq;
 338 }
 339
 340 static inline int irq_timing_decode(u64 value, u64 *timestamp)
 341 {
 342         *timestamp = value >> 16;
 343         return value & U16_MAX;
 344 }
 345
 346 /*
 347  * The function record_irq_time is only called in one place in the
 348  * interrupts handler. We want this function always inline so the code
 349  * inside is embedded in the function and the static key branching
 350  * code can act at the higher level. Without the explicit
 351  * __always_inline we can end up with a function call and a small
 352  * overhead in the hotpath for nothing.
 353  */
 354 static __always_inline void record_irq_time(struct irq_desc *desc)
 355 {
 356         if (!static_branch_likely(&irq_timing_enabled))
 357                 return;
 358
 359         if (desc->istate & IRQS_TIMINGS) {
 360                 struct irq_timings *timings = this_cpu_ptr(&irq_timings);
 361
 362                 timings->values[timings->count & IRQ_TIMINGS_MASK] =
 363                         irq_timing_encode(local_clock(),
 364                                           irq_desc_get_irq(desc));
 365
 366                 timings->count++;
 367         }
 368 }
 369 #else
 370 static inline void irq_remove_timings(struct irq_desc *desc) {}
 371 static inline void irq_setup_timings(struct irq_desc *desc,
 372                                      struct irqaction *act) {};
 373 static inline void record_irq_time(struct irq_desc *desc) {}
 374 #endif /* CONFIG_IRQ_TIMINGS */
 375
 376
 377 #ifdef CONFIG_GENERIC_IRQ_CHIP
 378 void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
 379                            int num_ct, unsigned int irq_base,
 380                            void __iomem *reg_base, irq_flow_handler_t handler);
 381 #else
 382 static inline void
 383 irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
 384                       int num_ct, unsigned int irq_base,
 385                       void __iomem *reg_base, irq_flow_handler_t handler) { }
 386 #endif /* CONFIG_GENERIC_IRQ_CHIP */
 387
 388 #ifdef CONFIG_GENERIC_PENDING_IRQ
 389 static inline bool irq_can_move_pcntxt(struct irq_data *data)
 390 {
 391         return irqd_can_move_in_process_context(data);
 392 }
 393 static inline bool irq_move_pending(struct irq_data *data)
 394 {
 395         return irqd_is_setaffinity_pending(data);
 396 }
 397 static inline void
 398 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
 399 {
 400         cpumask_copy(desc->pending_mask, mask);
 401 }
 402 static inline void
 403 irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
 404 {
 405         cpumask_copy(mask, desc->pending_mask);
 406 }
 407 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
 408 {
 409         return desc->pending_mask;
 410 }
 411 bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear);
 412 #else /* CONFIG_GENERIC_PENDING_IRQ */
 413 static inline bool irq_can_move_pcntxt(struct irq_data *data)
 414 {
 415         return true;
 416 }
 417 static inline bool irq_move_pending(struct irq_data *data)
 418 {
 419         return false;
 420 }
 421 static inline void
 422 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
 423 {
 424 }
 425 static inline void
 426 irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
 427 {
 428 }
 429 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
 430 {
 431         return NULL;
 432 }
 433 static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
 434 {
 435         return false;
 436 }
 437 #endif /* !CONFIG_GENERIC_PENDING_IRQ */
 438
 439 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
 440 #include <linux/debugfs.h>
 441
 442 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc);
 443 static inline void irq_remove_debugfs_entry(struct irq_desc *desc)
 444 {
 445         debugfs_remove(desc->debugfs_file);
 446 }
 447 # ifdef CONFIG_IRQ_DOMAIN
 448 void irq_domain_debugfs_init(struct dentry *root);
 449 # else
 450 static inline void irq_domain_debugfs_init(struct dentry *root)
 451 {
 452 }
 453 # endif
 454 #else /* CONFIG_GENERIC_IRQ_DEBUGFS */
 455 static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d)
 456 {
 457 }
 458 static inline void irq_remove_debugfs_entry(struct irq_desc *d)
 459 {
 460 }
 461 #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */