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[J-linux.git] / 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 */
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