1 /* SPDX-License-Identifier: GPL-2.0 */
3 * IRQ subsystem internal functions and variables:
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.
9 #include <linux/irqdesc.h>
10 #include <linux/kernel_stat.h>
11 #include <linux/pm_runtime.h>
12 #include <linux/sched/clock.h>
14 #ifdef CONFIG_SPARSE_IRQ
15 # define IRQ_BITMAP_BITS (NR_IRQS + 8196)
17 # define IRQ_BITMAP_BITS NR_IRQS
20 #define istate core_internal_state__do_not_mess_with_it
22 extern bool noirqdebug;
24 extern struct irqaction chained_action;
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
41 * Bit masks for desc->core_internal_state__do_not_mess_with_it
43 * IRQS_AUTODETECT - autodetection in progress
44 * IRQS_SPURIOUS_DISABLED - was disabled due to spurious interrupt
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
54 IRQS_AUTODETECT = 0x00000001,
55 IRQS_SPURIOUS_DISABLED = 0x00000002,
56 IRQS_POLL_INPROGRESS = 0x00000008,
57 IRQS_ONESHOT = 0x00000020,
58 IRQS_REPLAY = 0x00000040,
59 IRQS_WAITING = 0x00000080,
60 IRQS_PENDING = 0x00000200,
61 IRQS_SUSPENDED = 0x00000800,
62 IRQS_TIMINGS = 0x00001000,
68 extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
69 extern void __disable_irq(struct irq_desc *desc);
70 extern void __enable_irq(struct irq_desc *desc);
72 #define IRQ_RESEND true
73 #define IRQ_NORESEND false
75 #define IRQ_START_FORCE true
76 #define IRQ_START_COND false
78 extern int irq_startup(struct irq_desc *desc, bool resend, bool force);
80 extern void irq_shutdown(struct irq_desc *desc);
81 extern void irq_enable(struct irq_desc *desc);
82 extern void irq_disable(struct irq_desc *desc);
83 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
84 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
85 extern void mask_irq(struct irq_desc *desc);
86 extern void unmask_irq(struct irq_desc *desc);
87 extern void unmask_threaded_irq(struct irq_desc *desc);
89 #ifdef CONFIG_SPARSE_IRQ
90 static inline void irq_mark_irq(unsigned int irq) { }
92 extern void irq_mark_irq(unsigned int irq);
95 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
97 irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags);
98 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
99 irqreturn_t handle_irq_event(struct irq_desc *desc);
101 /* Resending of interrupts :*/
102 void check_irq_resend(struct irq_desc *desc);
103 bool irq_wait_for_poll(struct irq_desc *desc);
104 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
106 #ifdef CONFIG_PROC_FS
107 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
108 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
109 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
110 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
112 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
113 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
114 static inline void register_handler_proc(unsigned int irq,
115 struct irqaction *action) { }
116 static inline void unregister_handler_proc(unsigned int irq,
117 struct irqaction *action) { }
120 extern bool irq_can_set_affinity_usr(unsigned int irq);
122 extern void irq_set_thread_affinity(struct irq_desc *desc);
124 extern int irq_do_set_affinity(struct irq_data *data,
125 const struct cpumask *dest, bool force);
128 extern int irq_setup_affinity(struct irq_desc *desc);
130 static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; }
133 /* Inline functions for support of irq chips on slow busses */
134 static inline void chip_bus_lock(struct irq_desc *desc)
136 if (unlikely(desc->irq_data.chip->irq_bus_lock))
137 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
140 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
142 if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
143 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
146 #define _IRQ_DESC_CHECK (1 << 0)
147 #define _IRQ_DESC_PERCPU (1 << 1)
149 #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK)
150 #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
152 #define for_each_action_of_desc(desc, act) \
153 for (act = desc->action; act; act = act->next)
156 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
158 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
160 static inline struct irq_desc *
161 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
163 return __irq_get_desc_lock(irq, flags, true, check);
167 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
169 __irq_put_desc_unlock(desc, flags, true);
172 static inline struct irq_desc *
173 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
175 return __irq_get_desc_lock(irq, flags, false, check);
179 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
181 __irq_put_desc_unlock(desc, flags, false);
184 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
186 static inline unsigned int irqd_get(struct irq_data *d)
188 return __irqd_to_state(d);
192 * Manipulation functions for irq_data.state
194 static inline void irqd_set_move_pending(struct irq_data *d)
196 __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
199 static inline void irqd_clr_move_pending(struct irq_data *d)
201 __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
204 static inline void irqd_set_managed_shutdown(struct irq_data *d)
206 __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN;
209 static inline void irqd_clr_managed_shutdown(struct irq_data *d)
211 __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN;
214 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
216 __irqd_to_state(d) &= ~mask;
219 static inline void irqd_set(struct irq_data *d, unsigned int mask)
221 __irqd_to_state(d) |= mask;
224 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
226 return __irqd_to_state(d) & mask;
229 static inline void irq_state_set_disabled(struct irq_desc *desc)
231 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
234 static inline void irq_state_set_masked(struct irq_desc *desc)
236 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
239 #undef __irqd_to_state
241 static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc)
243 __this_cpu_inc(*desc->kstat_irqs);
244 __this_cpu_inc(kstat.irqs_sum);
247 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
249 __kstat_incr_irqs_this_cpu(desc);
253 static inline int irq_desc_get_node(struct irq_desc *desc)
255 return irq_common_data_get_node(&desc->irq_common_data);
258 static inline int irq_desc_is_chained(struct irq_desc *desc)
260 return (desc->action && desc->action == &chained_action);
263 #ifdef CONFIG_PM_SLEEP
264 bool irq_pm_check_wakeup(struct irq_desc *desc);
265 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
266 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
268 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
270 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
272 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
275 #ifdef CONFIG_IRQ_TIMINGS
277 #define IRQ_TIMINGS_SHIFT 5
278 #define IRQ_TIMINGS_SIZE (1 << IRQ_TIMINGS_SHIFT)
279 #define IRQ_TIMINGS_MASK (IRQ_TIMINGS_SIZE - 1)
282 * struct irq_timings - irq timings storing structure
283 * @values: a circular buffer of u64 encoded <timestamp,irq> values
284 * @count: the number of elements in the array
287 u64 values[IRQ_TIMINGS_SIZE];
291 DECLARE_PER_CPU(struct irq_timings, irq_timings);
293 extern void irq_timings_free(int irq);
294 extern int irq_timings_alloc(int irq);
296 static inline void irq_remove_timings(struct irq_desc *desc)
298 desc->istate &= ~IRQS_TIMINGS;
300 irq_timings_free(irq_desc_get_irq(desc));
303 static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act)
305 int irq = irq_desc_get_irq(desc);
309 * We don't need the measurement because the idle code already
310 * knows the next expiry event.
312 if (act->flags & __IRQF_TIMER)
316 * In case the timing allocation fails, we just want to warn,
317 * not fail, so letting the system boot anyway.
319 ret = irq_timings_alloc(irq);
321 pr_warn("Failed to allocate irq timing stats for irq%d (%d)",
326 desc->istate |= IRQS_TIMINGS;
329 extern void irq_timings_enable(void);
330 extern void irq_timings_disable(void);
332 DECLARE_STATIC_KEY_FALSE(irq_timing_enabled);
335 * The interrupt number and the timestamp are encoded into a single
336 * u64 variable to optimize the size.
337 * 48 bit time stamp and 16 bit IRQ number is way sufficient.
338 * Who cares an IRQ after 78 hours of idle time?
340 static inline u64 irq_timing_encode(u64 timestamp, int irq)
342 return (timestamp << 16) | irq;
345 static inline int irq_timing_decode(u64 value, u64 *timestamp)
347 *timestamp = value >> 16;
348 return value & U16_MAX;
352 * The function record_irq_time is only called in one place in the
353 * interrupts handler. We want this function always inline so the code
354 * inside is embedded in the function and the static key branching
355 * code can act at the higher level. Without the explicit
356 * __always_inline we can end up with a function call and a small
357 * overhead in the hotpath for nothing.
359 static __always_inline void record_irq_time(struct irq_desc *desc)
361 if (!static_branch_likely(&irq_timing_enabled))
364 if (desc->istate & IRQS_TIMINGS) {
365 struct irq_timings *timings = this_cpu_ptr(&irq_timings);
367 timings->values[timings->count & IRQ_TIMINGS_MASK] =
368 irq_timing_encode(local_clock(),
369 irq_desc_get_irq(desc));
375 static inline void irq_remove_timings(struct irq_desc *desc) {}
376 static inline void irq_setup_timings(struct irq_desc *desc,
377 struct irqaction *act) {};
378 static inline void record_irq_time(struct irq_desc *desc) {}
379 #endif /* CONFIG_IRQ_TIMINGS */
382 #ifdef CONFIG_GENERIC_IRQ_CHIP
383 void 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);
388 irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
389 int num_ct, unsigned int irq_base,
390 void __iomem *reg_base, irq_flow_handler_t handler) { }
391 #endif /* CONFIG_GENERIC_IRQ_CHIP */
393 #ifdef CONFIG_GENERIC_PENDING_IRQ
394 static inline bool irq_can_move_pcntxt(struct irq_data *data)
396 return irqd_can_move_in_process_context(data);
398 static inline bool irq_move_pending(struct irq_data *data)
400 return irqd_is_setaffinity_pending(data);
403 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
405 cpumask_copy(desc->pending_mask, mask);
408 irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
410 cpumask_copy(mask, desc->pending_mask);
412 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
414 return desc->pending_mask;
416 bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear);
417 #else /* CONFIG_GENERIC_PENDING_IRQ */
418 static inline bool irq_can_move_pcntxt(struct irq_data *data)
422 static inline bool irq_move_pending(struct irq_data *data)
427 irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
431 irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
434 static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
438 static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
442 #endif /* !CONFIG_GENERIC_PENDING_IRQ */
444 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
445 #include <linux/debugfs.h>
447 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc);
448 static inline void irq_remove_debugfs_entry(struct irq_desc *desc)
450 debugfs_remove(desc->debugfs_file);
452 # ifdef CONFIG_IRQ_DOMAIN
453 void irq_domain_debugfs_init(struct dentry *root);
455 static inline void irq_domain_debugfs_init(struct dentry *root)
459 #else /* CONFIG_GENERIC_IRQ_DEBUGFS */
460 static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d)
463 static inline void irq_remove_debugfs_entry(struct irq_desc *d)
466 #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */