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 : * IRQS_SYSFS - descriptor has been added to sysfs
56 : */
57 : enum {
58 : IRQS_AUTODETECT = 0x00000001,
59 : IRQS_SPURIOUS_DISABLED = 0x00000002,
60 : IRQS_POLL_INPROGRESS = 0x00000008,
61 : IRQS_ONESHOT = 0x00000020,
62 : IRQS_REPLAY = 0x00000040,
63 : IRQS_WAITING = 0x00000080,
64 : IRQS_PENDING = 0x00000200,
65 : IRQS_SUSPENDED = 0x00000800,
66 : IRQS_TIMINGS = 0x00001000,
67 : IRQS_NMI = 0x00002000,
68 : IRQS_SYSFS = 0x00004000,
69 : };
70 :
71 : #include "debug.h"
72 : #include "settings.h"
73 :
74 : extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
75 : extern void __disable_irq(struct irq_desc *desc);
76 : extern void __enable_irq(struct irq_desc *desc);
77 :
78 : #define IRQ_RESEND true
79 : #define IRQ_NORESEND false
80 :
81 : #define IRQ_START_FORCE true
82 : #define IRQ_START_COND false
83 :
84 : extern int irq_activate(struct irq_desc *desc);
85 : extern int irq_activate_and_startup(struct irq_desc *desc, bool resend);
86 : extern int irq_startup(struct irq_desc *desc, bool resend, bool force);
87 :
88 : extern void irq_shutdown(struct irq_desc *desc);
89 : extern void irq_shutdown_and_deactivate(struct irq_desc *desc);
90 : extern void irq_enable(struct irq_desc *desc);
91 : extern void irq_disable(struct irq_desc *desc);
92 : extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
93 : extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
94 : extern void mask_irq(struct irq_desc *desc);
95 : extern void unmask_irq(struct irq_desc *desc);
96 : extern void unmask_threaded_irq(struct irq_desc *desc);
97 :
98 : #ifdef CONFIG_SPARSE_IRQ
99 : static inline void irq_mark_irq(unsigned int irq) { }
100 : #else
101 : extern void irq_mark_irq(unsigned int irq);
102 : #endif
103 :
104 : extern int __irq_get_irqchip_state(struct irq_data *data,
105 : enum irqchip_irq_state which,
106 : bool *state);
107 :
108 : extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
109 :
110 : irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc);
111 : irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
112 : irqreturn_t handle_irq_event(struct irq_desc *desc);
113 :
114 : /* Resending of interrupts :*/
115 : int check_irq_resend(struct irq_desc *desc, bool inject);
116 : bool irq_wait_for_poll(struct irq_desc *desc);
117 : void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
118 :
119 : #ifdef CONFIG_PROC_FS
120 : extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
121 : extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
122 : extern void register_handler_proc(unsigned int irq, struct irqaction *action);
123 : extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
124 : #else
125 : static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
126 : static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
127 : static inline void register_handler_proc(unsigned int irq,
128 : struct irqaction *action) { }
129 : static inline void unregister_handler_proc(unsigned int irq,
130 : struct irqaction *action) { }
131 : #endif
132 :
133 : extern bool irq_can_set_affinity_usr(unsigned int irq);
134 :
135 : extern void irq_set_thread_affinity(struct irq_desc *desc);
136 :
137 : extern int irq_do_set_affinity(struct irq_data *data,
138 : const struct cpumask *dest, bool force);
139 :
140 : #ifdef CONFIG_SMP
141 : extern int irq_setup_affinity(struct irq_desc *desc);
142 : #else
143 : static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; }
144 : #endif
145 :
146 : /* Inline functions for support of irq chips on slow busses */
147 : static inline void chip_bus_lock(struct irq_desc *desc)
148 : {
149 66 : if (unlikely(desc->irq_data.chip->irq_bus_lock))
150 0 : desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
151 : }
152 :
153 : static inline void chip_bus_sync_unlock(struct irq_desc *desc)
154 : {
155 66 : if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
156 0 : desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
157 : }
158 :
159 : #define _IRQ_DESC_CHECK (1 << 0)
160 : #define _IRQ_DESC_PERCPU (1 << 1)
161 :
162 : #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK)
163 : #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
164 :
165 : #define for_each_action_of_desc(desc, act) \
166 : for (act = desc->action; act; act = act->next)
167 :
168 : struct irq_desc *
169 : __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
170 : unsigned int check);
171 : void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
172 :
173 : static inline struct irq_desc *
174 : irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
175 : {
176 64 : return __irq_get_desc_lock(irq, flags, true, check);
177 : }
178 :
179 : static inline void
180 : irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
181 : {
182 64 : __irq_put_desc_unlock(desc, flags, true);
183 : }
184 :
185 : static inline struct irq_desc *
186 : irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
187 : {
188 64 : return __irq_get_desc_lock(irq, flags, false, check);
189 : }
190 :
191 : static inline void
192 : irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
193 : {
194 64 : __irq_put_desc_unlock(desc, flags, false);
195 : }
196 :
197 : #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
198 :
199 : static inline unsigned int irqd_get(struct irq_data *d)
200 : {
201 : return __irqd_to_state(d);
202 : }
203 :
204 : /*
205 : * Manipulation functions for irq_data.state
206 : */
207 : static inline void irqd_set_move_pending(struct irq_data *d)
208 : {
209 : __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
210 : }
211 :
212 : static inline void irqd_clr_move_pending(struct irq_data *d)
213 : {
214 : __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
215 : }
216 :
217 : static inline void irqd_set_managed_shutdown(struct irq_data *d)
218 : {
219 0 : __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN;
220 : }
221 :
222 : static inline void irqd_clr_managed_shutdown(struct irq_data *d)
223 : {
224 : __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN;
225 : }
226 :
227 : static inline void irqd_clear(struct irq_data *d, unsigned int mask)
228 : {
229 2949 : __irqd_to_state(d) &= ~mask;
230 : }
231 :
232 : static inline void irqd_set(struct irq_data *d, unsigned int mask)
233 : {
234 3201 : __irqd_to_state(d) |= mask;
235 : }
236 :
237 : static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
238 : {
239 2943 : return __irqd_to_state(d) & mask;
240 : }
241 :
242 : static inline void irq_state_set_disabled(struct irq_desc *desc)
243 : {
244 0 : irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
245 : }
246 :
247 : static inline void irq_state_set_masked(struct irq_desc *desc)
248 : {
249 0 : irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
250 : }
251 :
252 : #undef __irqd_to_state
253 :
254 : static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc)
255 : {
256 2943 : __this_cpu_inc(*desc->kstat_irqs);
257 2943 : __this_cpu_inc(kstat.irqs_sum);
258 : }
259 :
260 : static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
261 : {
262 2943 : __kstat_incr_irqs_this_cpu(desc);
263 2943 : desc->tot_count++;
264 : }
265 :
266 : static inline int irq_desc_get_node(struct irq_desc *desc)
267 : {
268 0 : return irq_common_data_get_node(&desc->irq_common_data);
269 : }
270 :
271 : static inline int irq_desc_is_chained(struct irq_desc *desc)
272 : {
273 0 : return (desc->action && desc->action == &chained_action);
274 : }
275 :
276 : #ifdef CONFIG_PM_SLEEP
277 : bool irq_pm_check_wakeup(struct irq_desc *desc);
278 : void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
279 : void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
280 : #else
281 : static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
282 : static inline void
283 : irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
284 : static inline void
285 : irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
286 : #endif
287 :
288 : #ifdef CONFIG_IRQ_TIMINGS
289 :
290 : #define IRQ_TIMINGS_SHIFT 5
291 : #define IRQ_TIMINGS_SIZE (1 << IRQ_TIMINGS_SHIFT)
292 : #define IRQ_TIMINGS_MASK (IRQ_TIMINGS_SIZE - 1)
293 :
294 : /**
295 : * struct irq_timings - irq timings storing structure
296 : * @values: a circular buffer of u64 encoded <timestamp,irq> values
297 : * @count: the number of elements in the array
298 : */
299 : struct irq_timings {
300 : u64 values[IRQ_TIMINGS_SIZE];
301 : int count;
302 : };
303 :
304 : DECLARE_PER_CPU(struct irq_timings, irq_timings);
305 :
306 : extern void irq_timings_free(int irq);
307 : extern int irq_timings_alloc(int irq);
308 :
309 : static inline void irq_remove_timings(struct irq_desc *desc)
310 : {
311 : desc->istate &= ~IRQS_TIMINGS;
312 :
313 : irq_timings_free(irq_desc_get_irq(desc));
314 : }
315 :
316 : static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act)
317 : {
318 : int irq = irq_desc_get_irq(desc);
319 : int ret;
320 :
321 : /*
322 : * We don't need the measurement because the idle code already
323 : * knows the next expiry event.
324 : */
325 : if (act->flags & __IRQF_TIMER)
326 : return;
327 :
328 : /*
329 : * In case the timing allocation fails, we just want to warn,
330 : * not fail, so letting the system boot anyway.
331 : */
332 : ret = irq_timings_alloc(irq);
333 : if (ret) {
334 : pr_warn("Failed to allocate irq timing stats for irq%d (%d)",
335 : irq, ret);
336 : return;
337 : }
338 :
339 : desc->istate |= IRQS_TIMINGS;
340 : }
341 :
342 : extern void irq_timings_enable(void);
343 : extern void irq_timings_disable(void);
344 :
345 : DECLARE_STATIC_KEY_FALSE(irq_timing_enabled);
346 :
347 : /*
348 : * The interrupt number and the timestamp are encoded into a single
349 : * u64 variable to optimize the size.
350 : * 48 bit time stamp and 16 bit IRQ number is way sufficient.
351 : * Who cares an IRQ after 78 hours of idle time?
352 : */
353 : static inline u64 irq_timing_encode(u64 timestamp, int irq)
354 : {
355 : return (timestamp << 16) | irq;
356 : }
357 :
358 : static inline int irq_timing_decode(u64 value, u64 *timestamp)
359 : {
360 : *timestamp = value >> 16;
361 : return value & U16_MAX;
362 : }
363 :
364 : static __always_inline void irq_timings_push(u64 ts, int irq)
365 : {
366 : struct irq_timings *timings = this_cpu_ptr(&irq_timings);
367 :
368 : timings->values[timings->count & IRQ_TIMINGS_MASK] =
369 : irq_timing_encode(ts, irq);
370 :
371 : timings->count++;
372 : }
373 :
374 : /*
375 : * The function record_irq_time is only called in one place in the
376 : * interrupts handler. We want this function always inline so the code
377 : * inside is embedded in the function and the static key branching
378 : * code can act at the higher level. Without the explicit
379 : * __always_inline we can end up with a function call and a small
380 : * overhead in the hotpath for nothing.
381 : */
382 : static __always_inline void record_irq_time(struct irq_desc *desc)
383 : {
384 : if (!static_branch_likely(&irq_timing_enabled))
385 : return;
386 :
387 : if (desc->istate & IRQS_TIMINGS)
388 : irq_timings_push(local_clock(), irq_desc_get_irq(desc));
389 : }
390 : #else
391 : static inline void irq_remove_timings(struct irq_desc *desc) {}
392 : static inline void irq_setup_timings(struct irq_desc *desc,
393 : struct irqaction *act) {};
394 : static inline void record_irq_time(struct irq_desc *desc) {}
395 : #endif /* CONFIG_IRQ_TIMINGS */
396 :
397 :
398 : #ifdef CONFIG_GENERIC_IRQ_CHIP
399 : void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
400 : int num_ct, unsigned int irq_base,
401 : void __iomem *reg_base, irq_flow_handler_t handler);
402 : #else
403 : static inline void
404 : 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 : #endif /* CONFIG_GENERIC_IRQ_CHIP */
408 :
409 : #ifdef CONFIG_GENERIC_PENDING_IRQ
410 : static inline bool irq_can_move_pcntxt(struct irq_data *data)
411 : {
412 : return irqd_can_move_in_process_context(data);
413 : }
414 : static inline bool irq_move_pending(struct irq_data *data)
415 : {
416 : return irqd_is_setaffinity_pending(data);
417 : }
418 : static inline void
419 : irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
420 : {
421 : cpumask_copy(desc->pending_mask, mask);
422 : }
423 : static inline void
424 : irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
425 : {
426 : cpumask_copy(mask, desc->pending_mask);
427 : }
428 : static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
429 : {
430 : return desc->pending_mask;
431 : }
432 : static inline bool handle_enforce_irqctx(struct irq_data *data)
433 : {
434 : return irqd_is_handle_enforce_irqctx(data);
435 : }
436 : bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear);
437 : #else /* CONFIG_GENERIC_PENDING_IRQ */
438 : static inline bool irq_can_move_pcntxt(struct irq_data *data)
439 : {
440 : return true;
441 : }
442 : static inline bool irq_move_pending(struct irq_data *data)
443 : {
444 : return false;
445 : }
446 : static inline void
447 : irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
448 : {
449 : }
450 : static inline void
451 : irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
452 : {
453 : }
454 : static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
455 : {
456 : return NULL;
457 : }
458 : static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
459 : {
460 : return false;
461 : }
462 : static inline bool handle_enforce_irqctx(struct irq_data *data)
463 : {
464 : return false;
465 : }
466 : #endif /* !CONFIG_GENERIC_PENDING_IRQ */
467 :
468 : #if !defined(CONFIG_IRQ_DOMAIN) || !defined(CONFIG_IRQ_DOMAIN_HIERARCHY)
469 : static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve)
470 : {
471 : irqd_set_activated(data);
472 : return 0;
473 : }
474 : static inline void irq_domain_deactivate_irq(struct irq_data *data)
475 : {
476 : irqd_clr_activated(data);
477 : }
478 : #endif
479 :
480 : static inline struct irq_data *irqd_get_parent_data(struct irq_data *irqd)
481 : {
482 : #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
483 : return irqd->parent_data;
484 : #else
485 : return NULL;
486 : #endif
487 : }
488 :
489 : #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
490 : #include <linux/debugfs.h>
491 :
492 : void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc);
493 : static inline void irq_remove_debugfs_entry(struct irq_desc *desc)
494 : {
495 : debugfs_remove(desc->debugfs_file);
496 : kfree(desc->dev_name);
497 : }
498 : void irq_debugfs_copy_devname(int irq, struct device *dev);
499 : # ifdef CONFIG_IRQ_DOMAIN
500 : void irq_domain_debugfs_init(struct dentry *root);
501 : # else
502 : static inline void irq_domain_debugfs_init(struct dentry *root)
503 : {
504 : }
505 : # endif
506 : #else /* CONFIG_GENERIC_IRQ_DEBUGFS */
507 : static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d)
508 : {
509 : }
510 : static inline void irq_remove_debugfs_entry(struct irq_desc *d)
511 : {
512 : }
513 : static inline void irq_debugfs_copy_devname(int irq, struct device *dev)
514 : {
515 : }
516 : #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */
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