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 : * 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 is replayed
51 : * IRQS_WAITING - irq is waiting
52 : * IRQS_PENDING - irq is pending and replayed later
53 : * IRQS_SUSPENDED - irq is suspended
54 : * IRQS_NMI - irq line is used to deliver NMIs
55 : */
56 : enum {
57 : IRQS_AUTODETECT = 0x00000001,
58 : IRQS_SPURIOUS_DISABLED = 0x00000002,
59 : IRQS_POLL_INPROGRESS = 0x00000008,
60 : IRQS_ONESHOT = 0x00000020,
61 : IRQS_REPLAY = 0x00000040,
62 : IRQS_WAITING = 0x00000080,
63 : IRQS_PENDING = 0x00000200,
64 : IRQS_SUSPENDED = 0x00000800,
65 : IRQS_TIMINGS = 0x00001000,
66 : IRQS_NMI = 0x00002000,
67 : };
68 :
69 : #include "debug.h"
70 : #include "settings.h"
71 :
72 : extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
73 : extern void __disable_irq(struct irq_desc *desc);
74 : extern void __enable_irq(struct irq_desc *desc);
75 :
76 : #define IRQ_RESEND true
77 : #define IRQ_NORESEND false
78 :
79 : #define IRQ_START_FORCE true
80 : #define IRQ_START_COND false
81 :
82 : extern int irq_activate(struct irq_desc *desc);
83 : extern int irq_activate_and_startup(struct irq_desc *desc, bool resend);
84 : extern int irq_startup(struct irq_desc *desc, bool resend, bool force);
85 :
86 : extern void irq_shutdown(struct irq_desc *desc);
87 : extern void irq_shutdown_and_deactivate(struct irq_desc *desc);
88 : extern void irq_enable(struct irq_desc *desc);
89 : extern void irq_disable(struct irq_desc *desc);
90 : extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
91 : extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
92 : extern void mask_irq(struct irq_desc *desc);
93 : extern void unmask_irq(struct irq_desc *desc);
94 : extern void unmask_threaded_irq(struct irq_desc *desc);
95 :
96 : #ifdef CONFIG_SPARSE_IRQ
97 : static inline void irq_mark_irq(unsigned int irq) { }
98 : #else
99 : extern void irq_mark_irq(unsigned int irq);
100 : #endif
101 :
102 : extern int __irq_get_irqchip_state(struct irq_data *data,
103 : enum irqchip_irq_state which,
104 : bool *state);
105 :
106 : extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
107 :
108 : irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc);
109 : irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
110 : irqreturn_t handle_irq_event(struct irq_desc *desc);
111 :
112 : /* Resending of interrupts :*/
113 : int check_irq_resend(struct irq_desc *desc, bool inject);
114 : bool irq_wait_for_poll(struct irq_desc *desc);
115 : void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
116 :
117 : #ifdef CONFIG_PROC_FS
118 : extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
119 : extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
120 : extern void register_handler_proc(unsigned int irq, struct irqaction *action);
121 : extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
122 : #else
123 : static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
124 : static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
125 : static inline void register_handler_proc(unsigned int irq,
126 : struct irqaction *action) { }
127 : static inline void unregister_handler_proc(unsigned int irq,
128 : struct irqaction *action) { }
129 : #endif
130 :
131 : extern bool irq_can_set_affinity_usr(unsigned int irq);
132 :
133 : extern void irq_set_thread_affinity(struct irq_desc *desc);
134 :
135 : extern int irq_do_set_affinity(struct irq_data *data,
136 : const struct cpumask *dest, bool force);
137 :
138 : #ifdef CONFIG_SMP
139 : extern int irq_setup_affinity(struct irq_desc *desc);
140 : #else
141 : static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; }
142 : #endif
143 :
144 : /* Inline functions for support of irq chips on slow busses */
145 : static inline void chip_bus_lock(struct irq_desc *desc)
146 : {
147 66 : if (unlikely(desc->irq_data.chip->irq_bus_lock))
148 0 : desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
149 : }
150 :
151 : static inline void chip_bus_sync_unlock(struct irq_desc *desc)
152 : {
153 66 : if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
154 0 : desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
155 : }
156 :
157 : #define _IRQ_DESC_CHECK (1 << 0)
158 : #define _IRQ_DESC_PERCPU (1 << 1)
159 :
160 : #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK)
161 : #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
162 :
163 : #define for_each_action_of_desc(desc, act) \
164 : for (act = desc->action; act; act = act->next)
165 :
166 : struct irq_desc *
167 : __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
168 : unsigned int check);
169 : void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
170 :
171 : static inline struct irq_desc *
172 : irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
173 : {
174 64 : return __irq_get_desc_lock(irq, flags, true, check);
175 : }
176 :
177 : static inline void
178 : irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
179 : {
180 64 : __irq_put_desc_unlock(desc, flags, true);
181 : }
182 :
183 : static inline struct irq_desc *
184 : irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
185 : {
186 64 : return __irq_get_desc_lock(irq, flags, false, check);
187 : }
188 :
189 : static inline void
190 : irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
191 : {
192 64 : __irq_put_desc_unlock(desc, flags, false);
193 : }
194 :
195 : #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
196 :
197 : static inline unsigned int irqd_get(struct irq_data *d)
198 : {
199 : return __irqd_to_state(d);
200 : }
201 :
202 : /*
203 : * Manipulation functions for irq_data.state
204 : */
205 : static inline void irqd_set_move_pending(struct irq_data *d)
206 : {
207 : __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
208 : }
209 :
210 : static inline void irqd_clr_move_pending(struct irq_data *d)
211 : {
212 : __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
213 : }
214 :
215 : static inline void irqd_set_managed_shutdown(struct irq_data *d)
216 : {
217 : __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN;
218 : }
219 :
220 : static inline void irqd_clr_managed_shutdown(struct irq_data *d)
221 : {
222 : __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN;
223 : }
224 :
225 : static inline void irqd_clear(struct irq_data *d, unsigned int mask)
226 : {
227 19 : __irqd_to_state(d) &= ~mask;
228 : }
229 :
230 : static inline void irqd_set(struct irq_data *d, unsigned int mask)
231 : {
232 271 : __irqd_to_state(d) |= mask;
233 : }
234 :
235 : static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
236 : {
237 13 : return __irqd_to_state(d) & mask;
238 : }
239 :
240 : static inline void irq_state_set_disabled(struct irq_desc *desc)
241 : {
242 0 : irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
243 : }
244 :
245 : static inline void irq_state_set_masked(struct irq_desc *desc)
246 : {
247 0 : irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
248 : }
249 :
250 : #undef __irqd_to_state
251 :
252 : static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc)
253 : {
254 13 : __this_cpu_inc(*desc->kstat_irqs);
255 13 : __this_cpu_inc(kstat.irqs_sum);
256 : }
257 :
258 : static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
259 : {
260 13 : __kstat_incr_irqs_this_cpu(desc);
261 13 : desc->tot_count++;
262 : }
263 :
264 : static inline int irq_desc_get_node(struct irq_desc *desc)
265 : {
266 0 : return irq_common_data_get_node(&desc->irq_common_data);
267 : }
268 :
269 : static inline int irq_desc_is_chained(struct irq_desc *desc)
270 : {
271 0 : return (desc->action && desc->action == &chained_action);
272 : }
273 :
274 : #ifdef CONFIG_PM_SLEEP
275 : bool irq_pm_check_wakeup(struct irq_desc *desc);
276 : void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
277 : void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
278 : #else
279 : static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
280 : static inline void
281 : irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
282 : static inline void
283 : irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
284 : #endif
285 :
286 : #ifdef CONFIG_IRQ_TIMINGS
287 :
288 : #define IRQ_TIMINGS_SHIFT 5
289 : #define IRQ_TIMINGS_SIZE (1 << IRQ_TIMINGS_SHIFT)
290 : #define IRQ_TIMINGS_MASK (IRQ_TIMINGS_SIZE - 1)
291 :
292 : /**
293 : * struct irq_timings - irq timings storing structure
294 : * @values: a circular buffer of u64 encoded <timestamp,irq> values
295 : * @count: the number of elements in the array
296 : */
297 : struct irq_timings {
298 : u64 values[IRQ_TIMINGS_SIZE];
299 : int count;
300 : };
301 :
302 : DECLARE_PER_CPU(struct irq_timings, irq_timings);
303 :
304 : extern void irq_timings_free(int irq);
305 : extern int irq_timings_alloc(int irq);
306 :
307 : static inline void irq_remove_timings(struct irq_desc *desc)
308 : {
309 : desc->istate &= ~IRQS_TIMINGS;
310 :
311 : irq_timings_free(irq_desc_get_irq(desc));
312 : }
313 :
314 : static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act)
315 : {
316 : int irq = irq_desc_get_irq(desc);
317 : int ret;
318 :
319 : /*
320 : * We don't need the measurement because the idle code already
321 : * knows the next expiry event.
322 : */
323 : if (act->flags & __IRQF_TIMER)
324 : return;
325 :
326 : /*
327 : * In case the timing allocation fails, we just want to warn,
328 : * not fail, so letting the system boot anyway.
329 : */
330 : ret = irq_timings_alloc(irq);
331 : if (ret) {
332 : pr_warn("Failed to allocate irq timing stats for irq%d (%d)",
333 : irq, ret);
334 : return;
335 : }
336 :
337 : desc->istate |= IRQS_TIMINGS;
338 : }
339 :
340 : extern void irq_timings_enable(void);
341 : extern void irq_timings_disable(void);
342 :
343 : DECLARE_STATIC_KEY_FALSE(irq_timing_enabled);
344 :
345 : /*
346 : * The interrupt number and the timestamp are encoded into a single
347 : * u64 variable to optimize the size.
348 : * 48 bit time stamp and 16 bit IRQ number is way sufficient.
349 : * Who cares an IRQ after 78 hours of idle time?
350 : */
351 : static inline u64 irq_timing_encode(u64 timestamp, int irq)
352 : {
353 : return (timestamp << 16) | irq;
354 : }
355 :
356 : static inline int irq_timing_decode(u64 value, u64 *timestamp)
357 : {
358 : *timestamp = value >> 16;
359 : return value & U16_MAX;
360 : }
361 :
362 : static __always_inline void irq_timings_push(u64 ts, int irq)
363 : {
364 : struct irq_timings *timings = this_cpu_ptr(&irq_timings);
365 :
366 : timings->values[timings->count & IRQ_TIMINGS_MASK] =
367 : irq_timing_encode(ts, irq);
368 :
369 : timings->count++;
370 : }
371 :
372 : /*
373 : * The function record_irq_time is only called in one place in the
374 : * interrupts handler. We want this function always inline so the code
375 : * inside is embedded in the function and the static key branching
376 : * code can act at the higher level. Without the explicit
377 : * __always_inline we can end up with a function call and a small
378 : * overhead in the hotpath for nothing.
379 : */
380 : static __always_inline void record_irq_time(struct irq_desc *desc)
381 : {
382 : if (!static_branch_likely(&irq_timing_enabled))
383 : return;
384 :
385 : if (desc->istate & IRQS_TIMINGS)
386 : irq_timings_push(local_clock(), irq_desc_get_irq(desc));
387 : }
388 : #else
389 : static inline void irq_remove_timings(struct irq_desc *desc) {}
390 : static inline void irq_setup_timings(struct irq_desc *desc,
391 : struct irqaction *act) {};
392 : static inline void record_irq_time(struct irq_desc *desc) {}
393 : #endif /* CONFIG_IRQ_TIMINGS */
394 :
395 :
396 : #ifdef CONFIG_GENERIC_IRQ_CHIP
397 : void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
398 : int num_ct, unsigned int irq_base,
399 : void __iomem *reg_base, irq_flow_handler_t handler);
400 : #else
401 : static inline void
402 : irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
403 : int num_ct, unsigned int irq_base,
404 : void __iomem *reg_base, irq_flow_handler_t handler) { }
405 : #endif /* CONFIG_GENERIC_IRQ_CHIP */
406 :
407 : #ifdef CONFIG_GENERIC_PENDING_IRQ
408 : static inline bool irq_can_move_pcntxt(struct irq_data *data)
409 : {
410 : return irqd_can_move_in_process_context(data);
411 : }
412 : static inline bool irq_move_pending(struct irq_data *data)
413 : {
414 : return irqd_is_setaffinity_pending(data);
415 : }
416 : static inline void
417 : irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
418 : {
419 : cpumask_copy(desc->pending_mask, mask);
420 : }
421 : static inline void
422 : irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
423 : {
424 : cpumask_copy(mask, desc->pending_mask);
425 : }
426 : static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
427 : {
428 : return desc->pending_mask;
429 : }
430 : static inline bool handle_enforce_irqctx(struct irq_data *data)
431 : {
432 : return irqd_is_handle_enforce_irqctx(data);
433 : }
434 : bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear);
435 : #else /* CONFIG_GENERIC_PENDING_IRQ */
436 : static inline bool irq_can_move_pcntxt(struct irq_data *data)
437 : {
438 : return true;
439 : }
440 : static inline bool irq_move_pending(struct irq_data *data)
441 : {
442 : return false;
443 : }
444 : static inline void
445 : irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
446 : {
447 : }
448 : static inline void
449 : irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
450 : {
451 : }
452 : static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
453 : {
454 : return NULL;
455 : }
456 : static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
457 : {
458 : return false;
459 : }
460 : static inline bool handle_enforce_irqctx(struct irq_data *data)
461 : {
462 : return false;
463 : }
464 : #endif /* !CONFIG_GENERIC_PENDING_IRQ */
465 :
466 : #if !defined(CONFIG_IRQ_DOMAIN) || !defined(CONFIG_IRQ_DOMAIN_HIERARCHY)
467 : static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve)
468 : {
469 : irqd_set_activated(data);
470 : return 0;
471 : }
472 : static inline void irq_domain_deactivate_irq(struct irq_data *data)
473 : {
474 : irqd_clr_activated(data);
475 : }
476 : #endif
477 :
478 : static inline struct irq_data *irqd_get_parent_data(struct irq_data *irqd)
479 : {
480 : #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
481 : return irqd->parent_data;
482 : #else
483 : return NULL;
484 : #endif
485 : }
486 :
487 : #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
488 : #include <linux/debugfs.h>
489 :
490 : void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc);
491 : static inline void irq_remove_debugfs_entry(struct irq_desc *desc)
492 : {
493 : debugfs_remove(desc->debugfs_file);
494 : kfree(desc->dev_name);
495 : }
496 : void irq_debugfs_copy_devname(int irq, struct device *dev);
497 : # ifdef CONFIG_IRQ_DOMAIN
498 : void irq_domain_debugfs_init(struct dentry *root);
499 : # else
500 : static inline void irq_domain_debugfs_init(struct dentry *root)
501 : {
502 : }
503 : # endif
504 : #else /* CONFIG_GENERIC_IRQ_DEBUGFS */
505 : static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d)
506 : {
507 : }
508 : static inline void irq_remove_debugfs_entry(struct irq_desc *d)
509 : {
510 : }
511 : static inline void irq_debugfs_copy_devname(int irq, struct device *dev)
512 : {
513 : }
514 : #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */
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