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 | #ifdef CONFIG_SPARSE_IRQ |
102 | static inline void irq_mark_irq(unsigned int irq) { } |
103 | #else |
104 | extern void irq_mark_irq(unsigned int irq); |
105 | #endif |
106 | |
107 | extern int __irq_get_irqchip_state(struct irq_data *data, |
108 | enum irqchip_irq_state which, |
109 | bool *state); |
110 | |
111 | irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc); |
112 | irqreturn_t handle_irq_event_percpu(struct irq_desc *desc); |
113 | irqreturn_t handle_irq_event(struct irq_desc *desc); |
114 | |
115 | /* Resending of interrupts :*/ |
116 | int check_irq_resend(struct irq_desc *desc, bool inject); |
117 | void clear_irq_resend(struct irq_desc *desc); |
118 | void irq_resend_init(struct irq_desc *desc); |
119 | bool irq_wait_for_poll(struct irq_desc *desc); |
120 | void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action); |
121 | |
122 | void wake_threads_waitq(struct irq_desc *desc); |
123 | |
124 | #ifdef CONFIG_PROC_FS |
125 | extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); |
126 | extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc); |
127 | extern void register_handler_proc(unsigned int irq, struct irqaction *action); |
128 | extern void unregister_handler_proc(unsigned int irq, struct irqaction *action); |
129 | #else |
130 | static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { } |
131 | static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { } |
132 | static inline void register_handler_proc(unsigned int irq, |
133 | struct irqaction *action) { } |
134 | static inline void unregister_handler_proc(unsigned int irq, |
135 | struct irqaction *action) { } |
136 | #endif |
137 | |
138 | extern bool irq_can_set_affinity_usr(unsigned int irq); |
139 | |
140 | extern void irq_set_thread_affinity(struct irq_desc *desc); |
141 | |
142 | extern int irq_do_set_affinity(struct irq_data *data, |
143 | const struct cpumask *dest, bool force); |
144 | |
145 | #ifdef CONFIG_SMP |
146 | extern int irq_setup_affinity(struct irq_desc *desc); |
147 | #else |
148 | static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; } |
149 | #endif |
150 | |
151 | /* Inline functions for support of irq chips on slow busses */ |
152 | static inline void chip_bus_lock(struct irq_desc *desc) |
153 | { |
154 | if (unlikely(desc->irq_data.chip->irq_bus_lock)) |
155 | desc->irq_data.chip->irq_bus_lock(&desc->irq_data); |
156 | } |
157 | |
158 | static inline void chip_bus_sync_unlock(struct irq_desc *desc) |
159 | { |
160 | if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock)) |
161 | desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data); |
162 | } |
163 | |
164 | #define _IRQ_DESC_CHECK (1 << 0) |
165 | #define _IRQ_DESC_PERCPU (1 << 1) |
166 | |
167 | #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK) |
168 | #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU) |
169 | |
170 | #define for_each_action_of_desc(desc, act) \ |
171 | for (act = desc->action; act; act = act->next) |
172 | |
173 | struct irq_desc * |
174 | __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, |
175 | unsigned int check); |
176 | void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus); |
177 | |
178 | static inline struct irq_desc * |
179 | irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check) |
180 | { |
181 | return __irq_get_desc_lock(irq, flags, bus: true, check); |
182 | } |
183 | |
184 | static inline void |
185 | irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags) |
186 | { |
187 | __irq_put_desc_unlock(desc, flags, bus: true); |
188 | } |
189 | |
190 | static inline struct irq_desc * |
191 | irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check) |
192 | { |
193 | return __irq_get_desc_lock(irq, flags, bus: false, check); |
194 | } |
195 | |
196 | static inline void |
197 | irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags) |
198 | { |
199 | __irq_put_desc_unlock(desc, flags, bus: false); |
200 | } |
201 | |
202 | #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors) |
203 | |
204 | static inline unsigned int irqd_get(struct irq_data *d) |
205 | { |
206 | return __irqd_to_state(d); |
207 | } |
208 | |
209 | /* |
210 | * Manipulation functions for irq_data.state |
211 | */ |
212 | static inline void irqd_set_move_pending(struct irq_data *d) |
213 | { |
214 | __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING; |
215 | } |
216 | |
217 | static inline void irqd_clr_move_pending(struct irq_data *d) |
218 | { |
219 | __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING; |
220 | } |
221 | |
222 | static inline void irqd_set_managed_shutdown(struct irq_data *d) |
223 | { |
224 | __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN; |
225 | } |
226 | |
227 | static inline void irqd_clr_managed_shutdown(struct irq_data *d) |
228 | { |
229 | __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN; |
230 | } |
231 | |
232 | static inline void irqd_clear(struct irq_data *d, unsigned int mask) |
233 | { |
234 | __irqd_to_state(d) &= ~mask; |
235 | } |
236 | |
237 | static inline void irqd_set(struct irq_data *d, unsigned int mask) |
238 | { |
239 | __irqd_to_state(d) |= mask; |
240 | } |
241 | |
242 | static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) |
243 | { |
244 | return __irqd_to_state(d) & mask; |
245 | } |
246 | |
247 | static inline void irq_state_set_disabled(struct irq_desc *desc) |
248 | { |
249 | irqd_set(d: &desc->irq_data, mask: IRQD_IRQ_DISABLED); |
250 | } |
251 | |
252 | static inline void irq_state_set_masked(struct irq_desc *desc) |
253 | { |
254 | irqd_set(d: &desc->irq_data, mask: IRQD_IRQ_MASKED); |
255 | } |
256 | |
257 | #undef __irqd_to_state |
258 | |
259 | static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc) |
260 | { |
261 | __this_cpu_inc(*desc->kstat_irqs); |
262 | __this_cpu_inc(kstat.irqs_sum); |
263 | } |
264 | |
265 | static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc) |
266 | { |
267 | __kstat_incr_irqs_this_cpu(desc); |
268 | desc->tot_count++; |
269 | } |
270 | |
271 | static inline int irq_desc_get_node(struct irq_desc *desc) |
272 | { |
273 | return irq_common_data_get_node(d: &desc->irq_common_data); |
274 | } |
275 | |
276 | static inline int irq_desc_is_chained(struct irq_desc *desc) |
277 | { |
278 | return (desc->action && desc->action == &chained_action); |
279 | } |
280 | |
281 | #ifdef CONFIG_PM_SLEEP |
282 | bool irq_pm_check_wakeup(struct irq_desc *desc); |
283 | void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action); |
284 | void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action); |
285 | #else |
286 | static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; } |
287 | static inline void |
288 | irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { } |
289 | static inline void |
290 | irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { } |
291 | #endif |
292 | |
293 | #ifdef CONFIG_IRQ_TIMINGS |
294 | |
295 | #define IRQ_TIMINGS_SHIFT 5 |
296 | #define IRQ_TIMINGS_SIZE (1 << IRQ_TIMINGS_SHIFT) |
297 | #define IRQ_TIMINGS_MASK (IRQ_TIMINGS_SIZE - 1) |
298 | |
299 | /** |
300 | * struct irq_timings - irq timings storing structure |
301 | * @values: a circular buffer of u64 encoded <timestamp,irq> values |
302 | * @count: the number of elements in the array |
303 | */ |
304 | struct irq_timings { |
305 | u64 values[IRQ_TIMINGS_SIZE]; |
306 | int count; |
307 | }; |
308 | |
309 | DECLARE_PER_CPU(struct irq_timings, irq_timings); |
310 | |
311 | extern void irq_timings_free(int irq); |
312 | extern int irq_timings_alloc(int irq); |
313 | |
314 | static inline void irq_remove_timings(struct irq_desc *desc) |
315 | { |
316 | desc->istate &= ~IRQS_TIMINGS; |
317 | |
318 | irq_timings_free(irq_desc_get_irq(desc)); |
319 | } |
320 | |
321 | static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act) |
322 | { |
323 | int irq = irq_desc_get_irq(desc); |
324 | int ret; |
325 | |
326 | /* |
327 | * We don't need the measurement because the idle code already |
328 | * knows the next expiry event. |
329 | */ |
330 | if (act->flags & __IRQF_TIMER) |
331 | return; |
332 | |
333 | /* |
334 | * In case the timing allocation fails, we just want to warn, |
335 | * not fail, so letting the system boot anyway. |
336 | */ |
337 | ret = irq_timings_alloc(irq); |
338 | if (ret) { |
339 | pr_warn("Failed to allocate irq timing stats for irq%d (%d)" , |
340 | irq, ret); |
341 | return; |
342 | } |
343 | |
344 | desc->istate |= IRQS_TIMINGS; |
345 | } |
346 | |
347 | extern void irq_timings_enable(void); |
348 | extern void irq_timings_disable(void); |
349 | |
350 | DECLARE_STATIC_KEY_FALSE(irq_timing_enabled); |
351 | |
352 | /* |
353 | * The interrupt number and the timestamp are encoded into a single |
354 | * u64 variable to optimize the size. |
355 | * 48 bit time stamp and 16 bit IRQ number is way sufficient. |
356 | * Who cares an IRQ after 78 hours of idle time? |
357 | */ |
358 | static inline u64 irq_timing_encode(u64 timestamp, int irq) |
359 | { |
360 | return (timestamp << 16) | irq; |
361 | } |
362 | |
363 | static inline int irq_timing_decode(u64 value, u64 *timestamp) |
364 | { |
365 | *timestamp = value >> 16; |
366 | return value & U16_MAX; |
367 | } |
368 | |
369 | static __always_inline void irq_timings_push(u64 ts, int irq) |
370 | { |
371 | struct irq_timings *timings = this_cpu_ptr(&irq_timings); |
372 | |
373 | timings->values[timings->count & IRQ_TIMINGS_MASK] = |
374 | irq_timing_encode(ts, irq); |
375 | |
376 | timings->count++; |
377 | } |
378 | |
379 | /* |
380 | * The function record_irq_time is only called in one place in the |
381 | * interrupts handler. We want this function always inline so the code |
382 | * inside is embedded in the function and the static key branching |
383 | * code can act at the higher level. Without the explicit |
384 | * __always_inline we can end up with a function call and a small |
385 | * overhead in the hotpath for nothing. |
386 | */ |
387 | static __always_inline void record_irq_time(struct irq_desc *desc) |
388 | { |
389 | if (!static_branch_likely(&irq_timing_enabled)) |
390 | return; |
391 | |
392 | if (desc->istate & IRQS_TIMINGS) |
393 | irq_timings_push(local_clock(), irq_desc_get_irq(desc)); |
394 | } |
395 | #else |
396 | static inline void irq_remove_timings(struct irq_desc *desc) {} |
397 | static inline void irq_setup_timings(struct irq_desc *desc, |
398 | struct irqaction *act) {}; |
399 | static inline void record_irq_time(struct irq_desc *desc) {} |
400 | #endif /* CONFIG_IRQ_TIMINGS */ |
401 | |
402 | |
403 | #ifdef CONFIG_GENERIC_IRQ_CHIP |
404 | void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, |
405 | int num_ct, unsigned int irq_base, |
406 | void __iomem *reg_base, irq_flow_handler_t handler); |
407 | #else |
408 | static inline void |
409 | irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, |
410 | int num_ct, unsigned int irq_base, |
411 | void __iomem *reg_base, irq_flow_handler_t handler) { } |
412 | #endif /* CONFIG_GENERIC_IRQ_CHIP */ |
413 | |
414 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
415 | static inline bool irq_can_move_pcntxt(struct irq_data *data) |
416 | { |
417 | return irqd_can_move_in_process_context(d: data); |
418 | } |
419 | static inline bool irq_move_pending(struct irq_data *data) |
420 | { |
421 | return irqd_is_setaffinity_pending(d: data); |
422 | } |
423 | static inline void |
424 | irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) |
425 | { |
426 | cpumask_copy(dstp: desc->pending_mask, srcp: mask); |
427 | } |
428 | static inline void |
429 | irq_get_pending(struct cpumask *mask, struct irq_desc *desc) |
430 | { |
431 | cpumask_copy(dstp: mask, srcp: desc->pending_mask); |
432 | } |
433 | static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) |
434 | { |
435 | return desc->pending_mask; |
436 | } |
437 | static inline bool handle_enforce_irqctx(struct irq_data *data) |
438 | { |
439 | return irqd_is_handle_enforce_irqctx(d: data); |
440 | } |
441 | bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear); |
442 | #else /* CONFIG_GENERIC_PENDING_IRQ */ |
443 | static inline bool irq_can_move_pcntxt(struct irq_data *data) |
444 | { |
445 | return true; |
446 | } |
447 | static inline bool irq_move_pending(struct irq_data *data) |
448 | { |
449 | return false; |
450 | } |
451 | static inline void |
452 | irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) |
453 | { |
454 | } |
455 | static inline void |
456 | irq_get_pending(struct cpumask *mask, struct irq_desc *desc) |
457 | { |
458 | } |
459 | static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) |
460 | { |
461 | return NULL; |
462 | } |
463 | static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear) |
464 | { |
465 | return false; |
466 | } |
467 | static inline bool handle_enforce_irqctx(struct irq_data *data) |
468 | { |
469 | return false; |
470 | } |
471 | #endif /* !CONFIG_GENERIC_PENDING_IRQ */ |
472 | |
473 | #if !defined(CONFIG_IRQ_DOMAIN) || !defined(CONFIG_IRQ_DOMAIN_HIERARCHY) |
474 | static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve) |
475 | { |
476 | irqd_set_activated(data); |
477 | return 0; |
478 | } |
479 | static inline void irq_domain_deactivate_irq(struct irq_data *data) |
480 | { |
481 | irqd_clr_activated(data); |
482 | } |
483 | #endif |
484 | |
485 | static inline struct irq_data *irqd_get_parent_data(struct irq_data *irqd) |
486 | { |
487 | #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY |
488 | return irqd->parent_data; |
489 | #else |
490 | return NULL; |
491 | #endif |
492 | } |
493 | |
494 | #ifdef CONFIG_GENERIC_IRQ_DEBUGFS |
495 | #include <linux/debugfs.h> |
496 | |
497 | void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc); |
498 | static inline void irq_remove_debugfs_entry(struct irq_desc *desc) |
499 | { |
500 | debugfs_remove(dentry: desc->debugfs_file); |
501 | kfree(objp: desc->dev_name); |
502 | } |
503 | void irq_debugfs_copy_devname(int irq, struct device *dev); |
504 | # ifdef CONFIG_IRQ_DOMAIN |
505 | void irq_domain_debugfs_init(struct dentry *root); |
506 | # else |
507 | static inline void irq_domain_debugfs_init(struct dentry *root) |
508 | { |
509 | } |
510 | # endif |
511 | #else /* CONFIG_GENERIC_IRQ_DEBUGFS */ |
512 | static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d) |
513 | { |
514 | } |
515 | static inline void irq_remove_debugfs_entry(struct irq_desc *d) |
516 | { |
517 | } |
518 | static inline void irq_debugfs_copy_devname(int irq, struct device *dev) |
519 | { |
520 | } |
521 | #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */ |
522 | |