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 IRQ_BITMAP_BITS (NR_IRQS + 8196)
16 : #else
17 : # define IRQ_BITMAP_BITS 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 : */
33 : enum {
34 : IRQTF_RUNTHREAD,
35 : IRQTF_WARNED,
36 : IRQTF_AFFINITY,
37 : IRQTF_FORCED_THREAD,
38 : };
39 :
40 : /*
41 : * Bit masks for desc->core_internal_state__do_not_mess_with_it
42 : *
43 : * IRQS_AUTODETECT - autodetection in progress
44 : * IRQS_SPURIOUS_DISABLED - was disabled due to spurious interrupt
45 : * detection
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
52 : * IRQS_NMI - irq line is used to deliver NMIs
53 : */
54 : enum {
55 : IRQS_AUTODETECT = 0x00000001,
56 : IRQS_SPURIOUS_DISABLED = 0x00000002,
57 : IRQS_POLL_INPROGRESS = 0x00000008,
58 : IRQS_ONESHOT = 0x00000020,
59 : IRQS_REPLAY = 0x00000040,
60 : IRQS_WAITING = 0x00000080,
61 : IRQS_PENDING = 0x00000200,
62 : IRQS_SUSPENDED = 0x00000800,
63 : IRQS_TIMINGS = 0x00001000,
64 : IRQS_NMI = 0x00002000,
65 : };
66 :
67 : #include "debug.h"
68 : #include "settings.h"
69 :
70 : extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
71 : extern void __disable_irq(struct irq_desc *desc);
72 : extern void __enable_irq(struct irq_desc *desc);
73 :
74 : #define IRQ_RESEND true
75 : #define IRQ_NORESEND false
76 :
77 : #define IRQ_START_FORCE true
78 : #define IRQ_START_COND false
79 :
80 : extern int irq_activate(struct irq_desc *desc);
81 : extern int irq_activate_and_startup(struct irq_desc *desc, bool resend);
82 : extern int irq_startup(struct irq_desc *desc, bool resend, bool force);
83 :
84 : extern void irq_shutdown(struct irq_desc *desc);
85 : extern void irq_shutdown_and_deactivate(struct irq_desc *desc);
86 : extern void irq_enable(struct irq_desc *desc);
87 : extern void irq_disable(struct irq_desc *desc);
88 : extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
89 : extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
90 : extern void mask_irq(struct irq_desc *desc);
91 : extern void unmask_irq(struct irq_desc *desc);
92 : extern void unmask_threaded_irq(struct irq_desc *desc);
93 :
94 : #ifdef CONFIG_SPARSE_IRQ
95 16 : static inline void irq_mark_irq(unsigned int irq) { }
96 : #else
97 : extern void irq_mark_irq(unsigned int irq);
98 : #endif
99 :
100 : extern int __irq_get_irqchip_state(struct irq_data *data,
101 : enum irqchip_irq_state which,
102 : bool *state);
103 :
104 : extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
105 :
106 : irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags);
107 : irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
108 : irqreturn_t handle_irq_event(struct irq_desc *desc);
109 :
110 : /* Resending of interrupts :*/
111 : int check_irq_resend(struct irq_desc *desc, bool inject);
112 : bool irq_wait_for_poll(struct irq_desc *desc);
113 : void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
114 :
115 : #ifdef CONFIG_PROC_FS
116 : extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
117 : extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
118 : extern void register_handler_proc(unsigned int irq, struct irqaction *action);
119 : extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
120 : #else
121 : static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
122 : static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
123 : static inline void register_handler_proc(unsigned int irq,
124 : struct irqaction *action) { }
125 : static inline void unregister_handler_proc(unsigned int irq,
126 : struct irqaction *action) { }
127 : #endif
128 :
129 : extern bool irq_can_set_affinity_usr(unsigned int irq);
130 :
131 : extern void irq_set_thread_affinity(struct irq_desc *desc);
132 :
133 : extern int irq_do_set_affinity(struct irq_data *data,
134 : const struct cpumask *dest, bool force);
135 :
136 : #ifdef CONFIG_SMP
137 : extern int irq_setup_affinity(struct irq_desc *desc);
138 : #else
139 : static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; }
140 : #endif
141 :
142 : /* Inline functions for support of irq chips on slow busses */
143 35 : static inline void chip_bus_lock(struct irq_desc *desc)
144 : {
145 35 : if (unlikely(desc->irq_data.chip->irq_bus_lock))
146 0 : desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
147 : }
148 :
149 35 : static inline void chip_bus_sync_unlock(struct irq_desc *desc)
150 : {
151 35 : if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
152 0 : desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
153 : }
154 :
155 : #define _IRQ_DESC_CHECK (1 << 0)
156 : #define _IRQ_DESC_PERCPU (1 << 1)
157 :
158 : #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK)
159 : #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
160 :
161 : #define for_each_action_of_desc(desc, act) \
162 : for (act = desc->action; act; act = act->next)
163 :
164 : struct irq_desc *
165 : __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
166 : unsigned int check);
167 : void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
168 :
169 : static inline struct irq_desc *
170 31 : irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
171 : {
172 31 : return __irq_get_desc_lock(irq, flags, true, check);
173 : }
174 :
175 : static inline void
176 31 : irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
177 : {
178 31 : __irq_put_desc_unlock(desc, flags, true);
179 : }
180 :
181 : static inline struct irq_desc *
182 46 : irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
183 : {
184 46 : return __irq_get_desc_lock(irq, flags, false, check);
185 : }
186 :
187 : static inline void
188 46 : irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
189 : {
190 46 : __irq_put_desc_unlock(desc, flags, false);
191 : }
192 :
193 : #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
194 :
195 : static inline unsigned int irqd_get(struct irq_data *d)
196 : {
197 : return __irqd_to_state(d);
198 : }
199 :
200 : /*
201 : * Manipulation functions for irq_data.state
202 : */
203 0 : static inline void irqd_set_move_pending(struct irq_data *d)
204 : {
205 0 : __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
206 : }
207 :
208 0 : static inline void irqd_clr_move_pending(struct irq_data *d)
209 : {
210 0 : __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
211 0 : }
212 :
213 0 : static inline void irqd_set_managed_shutdown(struct irq_data *d)
214 : {
215 0 : __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN;
216 : }
217 :
218 0 : static inline void irqd_clr_managed_shutdown(struct irq_data *d)
219 : {
220 0 : __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN;
221 : }
222 :
223 3519 : static inline void irqd_clear(struct irq_data *d, unsigned int mask)
224 : {
225 3519 : __irqd_to_state(d) &= ~mask;
226 0 : }
227 :
228 3546 : static inline void irqd_set(struct irq_data *d, unsigned int mask)
229 : {
230 3542 : __irqd_to_state(d) |= mask;
231 0 : }
232 :
233 3483 : static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
234 : {
235 3483 : return __irqd_to_state(d) & mask;
236 : }
237 :
238 0 : static inline void irq_state_set_disabled(struct irq_desc *desc)
239 : {
240 0 : irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
241 : }
242 :
243 0 : static inline void irq_state_set_masked(struct irq_desc *desc)
244 : {
245 0 : irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
246 0 : }
247 :
248 : #undef __irqd_to_state
249 :
250 3480 : static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc)
251 : {
252 0 : __this_cpu_inc(*desc->kstat_irqs);
253 0 : __this_cpu_inc(kstat.irqs_sum);
254 : }
255 :
256 3480 : static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
257 : {
258 3480 : __kstat_incr_irqs_this_cpu(desc);
259 3480 : desc->tot_count++;
260 : }
261 :
262 4 : static inline int irq_desc_get_node(struct irq_desc *desc)
263 : {
264 4 : return irq_common_data_get_node(&desc->irq_common_data);
265 : }
266 :
267 0 : static inline int irq_desc_is_chained(struct irq_desc *desc)
268 : {
269 0 : return (desc->action && desc->action == &chained_action);
270 : }
271 :
272 : #ifdef CONFIG_PM_SLEEP
273 : bool irq_pm_check_wakeup(struct irq_desc *desc);
274 : void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
275 : void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
276 : #else
277 0 : static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
278 : static inline void
279 4 : irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
280 : static inline void
281 0 : irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
282 : #endif
283 :
284 : #ifdef CONFIG_IRQ_TIMINGS
285 :
286 : #define IRQ_TIMINGS_SHIFT 5
287 : #define IRQ_TIMINGS_SIZE (1 << IRQ_TIMINGS_SHIFT)
288 : #define IRQ_TIMINGS_MASK (IRQ_TIMINGS_SIZE - 1)
289 :
290 : /**
291 : * struct irq_timings - irq timings storing structure
292 : * @values: a circular buffer of u64 encoded <timestamp,irq> values
293 : * @count: the number of elements in the array
294 : */
295 : struct irq_timings {
296 : u64 values[IRQ_TIMINGS_SIZE];
297 : int count;
298 : };
299 :
300 : DECLARE_PER_CPU(struct irq_timings, irq_timings);
301 :
302 : extern void irq_timings_free(int irq);
303 : extern int irq_timings_alloc(int irq);
304 :
305 : static inline void irq_remove_timings(struct irq_desc *desc)
306 : {
307 : desc->istate &= ~IRQS_TIMINGS;
308 :
309 : irq_timings_free(irq_desc_get_irq(desc));
310 : }
311 :
312 : static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act)
313 : {
314 : int irq = irq_desc_get_irq(desc);
315 : int ret;
316 :
317 : /*
318 : * We don't need the measurement because the idle code already
319 : * knows the next expiry event.
320 : */
321 : if (act->flags & __IRQF_TIMER)
322 : return;
323 :
324 : /*
325 : * In case the timing allocation fails, we just want to warn,
326 : * not fail, so letting the system boot anyway.
327 : */
328 : ret = irq_timings_alloc(irq);
329 : if (ret) {
330 : pr_warn("Failed to allocate irq timing stats for irq%d (%d)",
331 : irq, ret);
332 : return;
333 : }
334 :
335 : desc->istate |= IRQS_TIMINGS;
336 : }
337 :
338 : extern void irq_timings_enable(void);
339 : extern void irq_timings_disable(void);
340 :
341 : DECLARE_STATIC_KEY_FALSE(irq_timing_enabled);
342 :
343 : /*
344 : * The interrupt number and the timestamp are encoded into a single
345 : * u64 variable to optimize the size.
346 : * 48 bit time stamp and 16 bit IRQ number is way sufficient.
347 : * Who cares an IRQ after 78 hours of idle time?
348 : */
349 : static inline u64 irq_timing_encode(u64 timestamp, int irq)
350 : {
351 : return (timestamp << 16) | irq;
352 : }
353 :
354 : static inline int irq_timing_decode(u64 value, u64 *timestamp)
355 : {
356 : *timestamp = value >> 16;
357 : return value & U16_MAX;
358 : }
359 :
360 : static __always_inline void irq_timings_push(u64 ts, int irq)
361 : {
362 : struct irq_timings *timings = this_cpu_ptr(&irq_timings);
363 :
364 : timings->values[timings->count & IRQ_TIMINGS_MASK] =
365 : irq_timing_encode(ts, irq);
366 :
367 : timings->count++;
368 : }
369 :
370 : /*
371 : * The function record_irq_time is only called in one place in the
372 : * interrupts handler. We want this function always inline so the code
373 : * inside is embedded in the function and the static key branching
374 : * code can act at the higher level. Without the explicit
375 : * __always_inline we can end up with a function call and a small
376 : * overhead in the hotpath for nothing.
377 : */
378 : static __always_inline void record_irq_time(struct irq_desc *desc)
379 : {
380 : if (!static_branch_likely(&irq_timing_enabled))
381 : return;
382 :
383 : if (desc->istate & IRQS_TIMINGS)
384 : irq_timings_push(local_clock(), irq_desc_get_irq(desc));
385 : }
386 : #else
387 : static inline void irq_remove_timings(struct irq_desc *desc) {}
388 4 : static inline void irq_setup_timings(struct irq_desc *desc,
389 4 : struct irqaction *act) {};
390 3480 : static inline void record_irq_time(struct irq_desc *desc) {}
391 : #endif /* CONFIG_IRQ_TIMINGS */
392 :
393 :
394 : #ifdef CONFIG_GENERIC_IRQ_CHIP
395 : void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
396 : int num_ct, unsigned int irq_base,
397 : void __iomem *reg_base, irq_flow_handler_t handler);
398 : #else
399 : static inline void
400 : irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
401 : int num_ct, unsigned int irq_base,
402 : void __iomem *reg_base, irq_flow_handler_t handler) { }
403 : #endif /* CONFIG_GENERIC_IRQ_CHIP */
404 :
405 : #ifdef CONFIG_GENERIC_PENDING_IRQ
406 0 : static inline bool irq_can_move_pcntxt(struct irq_data *data)
407 : {
408 0 : return irqd_can_move_in_process_context(data);
409 : }
410 0 : static inline bool irq_move_pending(struct irq_data *data)
411 : {
412 0 : return irqd_is_setaffinity_pending(data);
413 : }
414 : static inline void
415 0 : irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
416 : {
417 0 : cpumask_copy(desc->pending_mask, mask);
418 0 : }
419 : static inline void
420 0 : irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
421 : {
422 0 : cpumask_copy(mask, desc->pending_mask);
423 0 : }
424 0 : static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
425 : {
426 0 : return desc->pending_mask;
427 : }
428 0 : static inline bool handle_enforce_irqctx(struct irq_data *data)
429 : {
430 0 : return irqd_is_handle_enforce_irqctx(data);
431 : }
432 : bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear);
433 : #else /* CONFIG_GENERIC_PENDING_IRQ */
434 : static inline bool irq_can_move_pcntxt(struct irq_data *data)
435 : {
436 : return true;
437 : }
438 : static inline bool irq_move_pending(struct irq_data *data)
439 : {
440 : return false;
441 : }
442 : static inline void
443 : irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
444 : {
445 : }
446 : static inline void
447 : irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
448 : {
449 : }
450 : static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
451 : {
452 : return NULL;
453 : }
454 : static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
455 : {
456 : return false;
457 : }
458 : static inline bool handle_enforce_irqctx(struct irq_data *data)
459 : {
460 : return false;
461 : }
462 : #endif /* !CONFIG_GENERIC_PENDING_IRQ */
463 :
464 : #if !defined(CONFIG_IRQ_DOMAIN) || !defined(CONFIG_IRQ_DOMAIN_HIERARCHY)
465 : static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve)
466 : {
467 : irqd_set_activated(data);
468 : return 0;
469 : }
470 : static inline void irq_domain_deactivate_irq(struct irq_data *data)
471 : {
472 : irqd_clr_activated(data);
473 : }
474 : #endif
475 :
476 12 : static inline struct irq_data *irqd_get_parent_data(struct irq_data *irqd)
477 : {
478 : #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
479 12 : return irqd->parent_data;
480 : #else
481 : return NULL;
482 : #endif
483 : }
484 :
485 : #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
486 : #include <linux/debugfs.h>
487 :
488 : void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc);
489 : static inline void irq_remove_debugfs_entry(struct irq_desc *desc)
490 : {
491 : debugfs_remove(desc->debugfs_file);
492 : kfree(desc->dev_name);
493 : }
494 : void irq_debugfs_copy_devname(int irq, struct device *dev);
495 : # ifdef CONFIG_IRQ_DOMAIN
496 : void irq_domain_debugfs_init(struct dentry *root);
497 : # else
498 : static inline void irq_domain_debugfs_init(struct dentry *root)
499 : {
500 : }
501 : # endif
502 : #else /* CONFIG_GENERIC_IRQ_DEBUGFS */
503 0 : static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d)
504 : {
505 0 : }
506 0 : static inline void irq_remove_debugfs_entry(struct irq_desc *d)
507 : {
508 0 : }
509 : static inline void irq_debugfs_copy_devname(int irq, struct device *dev)
510 : {
511 : }
512 : #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */
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