2 * IRQ subsystem internal functions and variables:
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.
8 #include <linux/irqdesc.h>
9 #include <linux/kernel_stat.h>
10 #include <linux/pm_runtime.h>
11 #include <linux/sched/clock.h>
13 #ifdef CONFIG_SPARSE_IRQ
14 # define IRQ_BITMAP_BITS (NR_IRQS + 8196)
16 # define IRQ_BITMAP_BITS NR_IRQS
19 #define istate core_internal_state__do_not_mess_with_it
21 extern bool noirqdebug;
23 extern struct irqaction chained_action;
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
40 * Bit masks for desc->core_internal_state__do_not_mess_with_it
42 * IRQS_AUTODETECT - autodetection in progress
43 * IRQS_SPURIOUS_DISABLED - was disabled due to spurious interrupt
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
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,
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);
71 #define IRQ_RESEND true
72 #define IRQ_NORESEND false
74 #define IRQ_START_FORCE true
75 #define IRQ_START_COND false
77 extern int irq_startup(struct irq_desc *desc, bool resend, bool force);
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);
88 #ifdef CONFIG_SPARSE_IRQ
89 static inline void irq_mark_irq(unsigned int irq) { }
91 extern void irq_mark_irq(unsigned int irq);
94 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
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);
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);
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);
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) { }
119 extern bool irq_can_set_affinity_usr(unsigned int irq);
121 extern int irq_select_affinity_usr(unsigned int irq);
123 extern void irq_set_thread_affinity(struct irq_desc *desc);
125 extern int irq_do_set_affinity(struct irq_data *data,
126 const struct cpumask *dest, bool force);
129 extern int irq_setup_affinity(struct irq_desc *desc);
131 static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; }
134 /* Inline functions for support of irq chips on slow busses */
135 static inline void chip_bus_lock(struct irq_desc *desc)
137 if (unlikely(desc->irq_data.chip->irq_bus_lock))
138 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
141 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
143 if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
144 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
147 #define _IRQ_DESC_CHECK (1 << 0)
148 #define _IRQ_DESC_PERCPU (1 << 1)
150 #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK)
151 #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
153 #define for_each_action_of_desc(desc, act) \
154 for (act = desc->act; act; act = act->next)
157 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
159 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
161 static inline struct irq_desc *
162 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
164 return __irq_get_desc_lock(irq, flags, true, check);
168 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
170 __irq_put_desc_unlock(desc, flags, true);
173 static inline struct irq_desc *
174 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
176 return __irq_get_desc_lock(irq, flags, false, check);
180 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
182 __irq_put_desc_unlock(desc, flags, false);
185 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
187 static inline unsigned int irqd_get(struct irq_data *d)
189 return __irqd_to_state(d);
193 * Manipulation functions for irq_data.state
195 static inline void irqd_set_move_pending(struct irq_data *d)
197 __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
200 static inline void irqd_clr_move_pending(struct irq_data *d)
202 __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
205 static inline void irqd_set_managed_shutdown(struct irq_data *d)
207 __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN;
210 static inline void irqd_clr_managed_shutdown(struct irq_data *d)
212 __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN;
215 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
217 __irqd_to_state(d) &= ~mask;
220 static inline void irqd_set(struct irq_data *d, unsigned int mask)
222 __irqd_to_state(d) |= mask;
225 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
227 return __irqd_to_state(d) & mask;
230 static inline void irq_state_set_disabled(struct irq_desc *desc)
232 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
235 static inline void irq_state_set_masked(struct irq_desc *desc)
237 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
240 #undef __irqd_to_state
242 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
244 __this_cpu_inc(*desc->kstat_irqs);
245 __this_cpu_inc(kstat.irqs_sum);
248 static inline int irq_desc_get_node(struct irq_desc *desc)
250 return irq_common_data_get_node(&desc->irq_common_data);
253 static inline int irq_desc_is_chained(struct irq_desc *desc)
255 return (desc->action && desc->action == &chained_action);
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);
263 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
265 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
267 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
270 #ifdef CONFIG_IRQ_TIMINGS
272 #define IRQ_TIMINGS_SHIFT 5
273 #define IRQ_TIMINGS_SIZE (1 << IRQ_TIMINGS_SHIFT)
274 #define IRQ_TIMINGS_MASK (IRQ_TIMINGS_SIZE - 1)
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
282 u64 values[IRQ_TIMINGS_SIZE];
286 DECLARE_PER_CPU(struct irq_timings, irq_timings);
288 extern void irq_timings_free(int irq);
289 extern int irq_timings_alloc(int irq);
291 static inline void irq_remove_timings(struct irq_desc *desc)
293 desc->istate &= ~IRQS_TIMINGS;
295 irq_timings_free(irq_desc_get_irq(desc));
298 static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act)
300 int irq = irq_desc_get_irq(desc);
304 * We don't need the measurement because the idle code already
305 * knows the next expiry event.
307 if (act->flags & __IRQF_TIMER)
311 * In case the timing allocation fails, we just want to warn,
312 * not fail, so letting the system boot anyway.
314 ret = irq_timings_alloc(irq);
316 pr_warn("Failed to allocate irq timing stats for irq%d (%d)",
321 desc->istate |= IRQS_TIMINGS;
324 extern void irq_timings_enable(void);
325 extern void irq_timings_disable(void);
327 DECLARE_STATIC_KEY_FALSE(irq_timing_enabled);
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?
335 static inline u64 irq_timing_encode(u64 timestamp, int irq)
337 return (timestamp << 16) | irq;
340 static inline int irq_timing_decode(u64 value, u64 *timestamp)
342 *timestamp = value >> 16;
343 return value & U16_MAX;
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.
354 static __always_inline void record_irq_time(struct irq_desc *desc)
356 if (!static_branch_likely(&irq_timing_enabled))
359 if (desc->istate & IRQS_TIMINGS) {
360 struct irq_timings *timings = this_cpu_ptr(&irq_timings);
362 timings->values[timings->count & IRQ_TIMINGS_MASK] =
363 irq_timing_encode(local_clock(),
364 irq_desc_get_irq(desc));
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 */
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);
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 */
388 #ifdef CONFIG_GENERIC_PENDING_IRQ
389 static inline bool irq_can_move_pcntxt(struct irq_data *data)
391 return irqd_can_move_in_process_context(data);
393 static inline bool irq_move_pending(struct irq_data *data)
395 return irqd_is_setaffinity_pending(data);
398 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
400 cpumask_copy(desc->pending_mask, mask);
403 irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
405 cpumask_copy(mask, desc->pending_mask);
407 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
409 return desc->pending_mask;
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)
417 static inline bool irq_move_pending(struct irq_data *data)
422 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
426 irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
429 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
433 static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
437 #endif /* !CONFIG_GENERIC_PENDING_IRQ */
439 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
440 #include <linux/debugfs.h>
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)
445 debugfs_remove(desc->debugfs_file);
447 # ifdef CONFIG_IRQ_DOMAIN
448 void irq_domain_debugfs_init(struct dentry *root);
450 static inline void irq_domain_debugfs_init(struct dentry *root)
454 #else /* CONFIG_GENERIC_IRQ_DEBUGFS */
455 static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d)
458 static inline void irq_remove_debugfs_entry(struct irq_desc *d)
461 #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */