Line data Source code
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 : extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
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 : #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 66 : if (unlikely(desc->irq_data.chip->irq_bus_lock))
155 0 : 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 66 : if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
161 0 : 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 64 : return __irq_get_desc_lock(irq, flags, true, check);
182 : }
183 :
184 : static inline void
185 : irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
186 : {
187 64 : __irq_put_desc_unlock(desc, flags, 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 64 : return __irq_get_desc_lock(irq, flags, false, check);
194 : }
195 :
196 : static inline void
197 : irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
198 : {
199 64 : __irq_put_desc_unlock(desc, flags, 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 0 : __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 11 : __irqd_to_state(d) &= ~mask;
235 : }
236 :
237 : static inline void irqd_set(struct irq_data *d, unsigned int mask)
238 : {
239 263 : __irqd_to_state(d) |= mask;
240 : }
241 :
242 : static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
243 : {
244 5 : return __irqd_to_state(d) & mask;
245 : }
246 :
247 : static inline void irq_state_set_disabled(struct irq_desc *desc)
248 : {
249 0 : irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
250 : }
251 :
252 : static inline void irq_state_set_masked(struct irq_desc *desc)
253 : {
254 0 : irqd_set(&desc->irq_data, 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 5 : __this_cpu_inc(*desc->kstat_irqs);
262 5 : __this_cpu_inc(kstat.irqs_sum);
263 : }
264 :
265 : static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
266 : {
267 5 : __kstat_incr_irqs_this_cpu(desc);
268 5 : desc->tot_count++;
269 : }
270 :
271 : static inline int irq_desc_get_node(struct irq_desc *desc)
272 : {
273 0 : return irq_common_data_get_node(&desc->irq_common_data);
274 : }
275 :
276 : static inline int irq_desc_is_chained(struct irq_desc *desc)
277 : {
278 0 : 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(data);
418 : }
419 : static inline bool irq_move_pending(struct irq_data *data)
420 : {
421 : return irqd_is_setaffinity_pending(data);
422 : }
423 : static inline void
424 : irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
425 : {
426 : cpumask_copy(desc->pending_mask, mask);
427 : }
428 : static inline void
429 : irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
430 : {
431 : cpumask_copy(mask, 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(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(desc->debugfs_file);
501 : kfree(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 */
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