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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* |
3 | * IRQ subsystem internal functions and variables: | |
dbec07ba TG |
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. | |
1da177e4 | 8 | */ |
e144710b | 9 | #include <linux/irqdesc.h> |
8f945a33 | 10 | #include <linux/kernel_stat.h> |
be45beb2 | 11 | #include <linux/pm_runtime.h> |
b2d3d61a | 12 | #include <linux/sched/clock.h> |
1da177e4 | 13 | |
c1ee6264 TG |
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 | ||
dbec07ba TG |
20 | #define istate core_internal_state__do_not_mess_with_it |
21 | ||
2329abfa | 22 | extern bool noirqdebug; |
1da177e4 | 23 | |
e509bd7d MW |
24 | extern struct irqaction chained_action; |
25 | ||
1535dfac TG |
26 | /* |
27 | * Bits used by threaded handlers: | |
28 | * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run | |
1535dfac TG |
29 | * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed |
30 | * IRQTF_AFFINITY - irq thread is requested to adjust affinity | |
8d32a307 | 31 | * IRQTF_FORCED_THREAD - irq action is force threaded |
1535dfac TG |
32 | */ |
33 | enum { | |
34 | IRQTF_RUNTHREAD, | |
1535dfac TG |
35 | IRQTF_WARNED, |
36 | IRQTF_AFFINITY, | |
8d32a307 | 37 | IRQTF_FORCED_THREAD, |
1535dfac TG |
38 | }; |
39 | ||
bd062e76 | 40 | /* |
a257954b | 41 | * Bit masks for desc->core_internal_state__do_not_mess_with_it |
bd062e76 TG |
42 | * |
43 | * IRQS_AUTODETECT - autodetection in progress | |
7acdd53e TG |
44 | * IRQS_SPURIOUS_DISABLED - was disabled due to spurious interrupt |
45 | * detection | |
6954b75b | 46 | * IRQS_POLL_INPROGRESS - polling in progress |
3d67baec | 47 | * IRQS_ONESHOT - irq is not unmasked in primary handler |
163ef309 TG |
48 | * IRQS_REPLAY - irq is replayed |
49 | * IRQS_WAITING - irq is waiting | |
2a0d6fb3 | 50 | * IRQS_PENDING - irq is pending and replayed later |
c531e836 | 51 | * IRQS_SUSPENDED - irq is suspended |
bd062e76 TG |
52 | */ |
53 | enum { | |
54 | IRQS_AUTODETECT = 0x00000001, | |
7acdd53e | 55 | IRQS_SPURIOUS_DISABLED = 0x00000002, |
6954b75b | 56 | IRQS_POLL_INPROGRESS = 0x00000008, |
3d67baec | 57 | IRQS_ONESHOT = 0x00000020, |
163ef309 TG |
58 | IRQS_REPLAY = 0x00000040, |
59 | IRQS_WAITING = 0x00000080, | |
2a0d6fb3 | 60 | IRQS_PENDING = 0x00000200, |
c531e836 | 61 | IRQS_SUSPENDED = 0x00000800, |
b2d3d61a | 62 | IRQS_TIMINGS = 0x00001000, |
bd062e76 TG |
63 | }; |
64 | ||
1ce6068d TG |
65 | #include "debug.h" |
66 | #include "settings.h" | |
67 | ||
a1ff541a | 68 | extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags); |
79ff1cda JL |
69 | extern void __disable_irq(struct irq_desc *desc); |
70 | extern void __enable_irq(struct irq_desc *desc); | |
0c5d1eb7 | 71 | |
4cde9c6b TG |
72 | #define IRQ_RESEND true |
73 | #define IRQ_NORESEND false | |
74 | ||
75 | #define IRQ_START_FORCE true | |
76 | #define IRQ_START_COND false | |
77 | ||
78 | extern int irq_startup(struct irq_desc *desc, bool resend, bool force); | |
79 | ||
46999238 | 80 | extern void irq_shutdown(struct irq_desc *desc); |
87923470 TG |
81 | extern void irq_enable(struct irq_desc *desc); |
82 | extern void irq_disable(struct irq_desc *desc); | |
31d9d9b6 MZ |
83 | extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu); |
84 | extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu); | |
d4d5e089 TG |
85 | extern void mask_irq(struct irq_desc *desc); |
86 | extern void unmask_irq(struct irq_desc *desc); | |
328a4978 | 87 | extern void unmask_threaded_irq(struct irq_desc *desc); |
46999238 | 88 | |
f63b6a05 TG |
89 | #ifdef CONFIG_SPARSE_IRQ |
90 | static inline void irq_mark_irq(unsigned int irq) { } | |
91 | #else | |
92 | extern void irq_mark_irq(unsigned int irq); | |
93 | #endif | |
94 | ||
85ac16d0 | 95 | extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr); |
0fa0ebbf | 96 | |
edd14cfe | 97 | irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags); |
71f64340 | 98 | irqreturn_t handle_irq_event_percpu(struct irq_desc *desc); |
4912609f TG |
99 | irqreturn_t handle_irq_event(struct irq_desc *desc); |
100 | ||
e144710b | 101 | /* Resending of interrupts :*/ |
0798abeb | 102 | void check_irq_resend(struct irq_desc *desc); |
fe200ae4 | 103 | bool irq_wait_for_poll(struct irq_desc *desc); |
a92444c6 | 104 | void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action); |
e144710b | 105 | |
1da177e4 | 106 | #ifdef CONFIG_PROC_FS |
2c6927a3 | 107 | extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); |
13bfe99e | 108 | extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc); |
1da177e4 LT |
109 | extern void register_handler_proc(unsigned int irq, struct irqaction *action); |
110 | extern void unregister_handler_proc(unsigned int irq, struct irqaction *action); | |
111 | #else | |
2c6927a3 | 112 | static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { } |
13bfe99e | 113 | static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { } |
1da177e4 LT |
114 | static inline void register_handler_proc(unsigned int irq, |
115 | struct irqaction *action) { } | |
116 | static inline void unregister_handler_proc(unsigned int irq, | |
117 | struct irqaction *action) { } | |
118 | #endif | |
119 | ||
9c255583 TG |
120 | extern bool irq_can_set_affinity_usr(unsigned int irq); |
121 | ||
cba4235e | 122 | extern int irq_select_affinity_usr(unsigned int irq); |
f6d87f4b | 123 | |
591d2fb0 | 124 | extern void irq_set_thread_affinity(struct irq_desc *desc); |
57b150cc | 125 | |
818b0f3b JL |
126 | extern int irq_do_set_affinity(struct irq_data *data, |
127 | const struct cpumask *dest, bool force); | |
128 | ||
43564bd9 TG |
129 | #ifdef CONFIG_SMP |
130 | extern int irq_setup_affinity(struct irq_desc *desc); | |
131 | #else | |
132 | static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; } | |
133 | #endif | |
134 | ||
70aedd24 | 135 | /* Inline functions for support of irq chips on slow busses */ |
3876ec9e | 136 | static inline void chip_bus_lock(struct irq_desc *desc) |
70aedd24 | 137 | { |
3876ec9e TG |
138 | if (unlikely(desc->irq_data.chip->irq_bus_lock)) |
139 | desc->irq_data.chip->irq_bus_lock(&desc->irq_data); | |
70aedd24 TG |
140 | } |
141 | ||
3876ec9e | 142 | static inline void chip_bus_sync_unlock(struct irq_desc *desc) |
70aedd24 | 143 | { |
3876ec9e TG |
144 | if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock)) |
145 | desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data); | |
70aedd24 TG |
146 | } |
147 | ||
31d9d9b6 MZ |
148 | #define _IRQ_DESC_CHECK (1 << 0) |
149 | #define _IRQ_DESC_PERCPU (1 << 1) | |
150 | ||
151 | #define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK) | |
152 | #define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU) | |
153 | ||
f944b5a7 | 154 | #define for_each_action_of_desc(desc, act) \ |
163616cf | 155 | for (act = desc->action; act; act = act->next) |
f944b5a7 | 156 | |
d5eb4ad2 | 157 | struct irq_desc * |
31d9d9b6 MZ |
158 | __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus, |
159 | unsigned int check); | |
d5eb4ad2 TG |
160 | void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus); |
161 | ||
162 | static inline struct irq_desc * | |
31d9d9b6 | 163 | irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check) |
d5eb4ad2 | 164 | { |
31d9d9b6 | 165 | return __irq_get_desc_lock(irq, flags, true, check); |
d5eb4ad2 TG |
166 | } |
167 | ||
168 | static inline void | |
169 | irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags) | |
170 | { | |
171 | __irq_put_desc_unlock(desc, flags, true); | |
172 | } | |
173 | ||
174 | static inline struct irq_desc * | |
31d9d9b6 | 175 | irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check) |
d5eb4ad2 | 176 | { |
31d9d9b6 | 177 | return __irq_get_desc_lock(irq, flags, false, check); |
d5eb4ad2 TG |
178 | } |
179 | ||
180 | static inline void | |
181 | irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags) | |
182 | { | |
183 | __irq_put_desc_unlock(desc, flags, false); | |
184 | } | |
185 | ||
b354286e BF |
186 | #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors) |
187 | ||
087cdfb6 TG |
188 | static inline unsigned int irqd_get(struct irq_data *d) |
189 | { | |
190 | return __irqd_to_state(d); | |
191 | } | |
192 | ||
f230b6d5 TG |
193 | /* |
194 | * Manipulation functions for irq_data.state | |
195 | */ | |
196 | static inline void irqd_set_move_pending(struct irq_data *d) | |
197 | { | |
0d0b4c86 | 198 | __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING; |
f230b6d5 TG |
199 | } |
200 | ||
201 | static inline void irqd_clr_move_pending(struct irq_data *d) | |
202 | { | |
0d0b4c86 | 203 | __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING; |
f230b6d5 | 204 | } |
a005677b | 205 | |
54fdf6a0 TG |
206 | static inline void irqd_set_managed_shutdown(struct irq_data *d) |
207 | { | |
208 | __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN; | |
209 | } | |
210 | ||
211 | static inline void irqd_clr_managed_shutdown(struct irq_data *d) | |
212 | { | |
213 | __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN; | |
214 | } | |
215 | ||
a005677b TG |
216 | static inline void irqd_clear(struct irq_data *d, unsigned int mask) |
217 | { | |
0d0b4c86 | 218 | __irqd_to_state(d) &= ~mask; |
a005677b TG |
219 | } |
220 | ||
221 | static inline void irqd_set(struct irq_data *d, unsigned int mask) | |
222 | { | |
0d0b4c86 | 223 | __irqd_to_state(d) |= mask; |
a005677b TG |
224 | } |
225 | ||
2bdd1055 TG |
226 | static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) |
227 | { | |
0d0b4c86 | 228 | return __irqd_to_state(d) & mask; |
2bdd1055 | 229 | } |
8f945a33 | 230 | |
a696712c JG |
231 | static inline void irq_state_set_disabled(struct irq_desc *desc) |
232 | { | |
233 | irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED); | |
234 | } | |
235 | ||
236 | static inline void irq_state_set_masked(struct irq_desc *desc) | |
237 | { | |
238 | irqd_set(&desc->irq_data, IRQD_IRQ_MASKED); | |
239 | } | |
240 | ||
b354286e BF |
241 | #undef __irqd_to_state |
242 | ||
b51bf95c | 243 | static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc) |
8f945a33 TG |
244 | { |
245 | __this_cpu_inc(*desc->kstat_irqs); | |
246 | __this_cpu_inc(kstat.irqs_sum); | |
247 | } | |
cab303be | 248 | |
6783011b JL |
249 | static inline int irq_desc_get_node(struct irq_desc *desc) |
250 | { | |
449e9cae | 251 | return irq_common_data_get_node(&desc->irq_common_data); |
6783011b JL |
252 | } |
253 | ||
4717f133 GS |
254 | static inline int irq_desc_is_chained(struct irq_desc *desc) |
255 | { | |
256 | return (desc->action && desc->action == &chained_action); | |
257 | } | |
258 | ||
cab303be | 259 | #ifdef CONFIG_PM_SLEEP |
9ce7a258 | 260 | bool irq_pm_check_wakeup(struct irq_desc *desc); |
cab303be TG |
261 | void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action); |
262 | void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action); | |
263 | #else | |
9ce7a258 | 264 | static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; } |
cab303be TG |
265 | static inline void |
266 | irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { } | |
267 | static inline void | |
268 | irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { } | |
269 | #endif | |
f1602039 | 270 | |
b2d3d61a DL |
271 | #ifdef CONFIG_IRQ_TIMINGS |
272 | ||
273 | #define IRQ_TIMINGS_SHIFT 5 | |
274 | #define IRQ_TIMINGS_SIZE (1 << IRQ_TIMINGS_SHIFT) | |
275 | #define IRQ_TIMINGS_MASK (IRQ_TIMINGS_SIZE - 1) | |
276 | ||
277 | /** | |
278 | * struct irq_timings - irq timings storing structure | |
279 | * @values: a circular buffer of u64 encoded <timestamp,irq> values | |
280 | * @count: the number of elements in the array | |
281 | */ | |
282 | struct irq_timings { | |
283 | u64 values[IRQ_TIMINGS_SIZE]; | |
284 | int count; | |
285 | }; | |
286 | ||
287 | DECLARE_PER_CPU(struct irq_timings, irq_timings); | |
288 | ||
e1c92149 DL |
289 | extern void irq_timings_free(int irq); |
290 | extern int irq_timings_alloc(int irq); | |
291 | ||
b2d3d61a DL |
292 | static inline void irq_remove_timings(struct irq_desc *desc) |
293 | { | |
294 | desc->istate &= ~IRQS_TIMINGS; | |
e1c92149 DL |
295 | |
296 | irq_timings_free(irq_desc_get_irq(desc)); | |
b2d3d61a DL |
297 | } |
298 | ||
299 | static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act) | |
300 | { | |
e1c92149 DL |
301 | int irq = irq_desc_get_irq(desc); |
302 | int ret; | |
303 | ||
b2d3d61a DL |
304 | /* |
305 | * We don't need the measurement because the idle code already | |
306 | * knows the next expiry event. | |
307 | */ | |
308 | if (act->flags & __IRQF_TIMER) | |
309 | return; | |
310 | ||
e1c92149 DL |
311 | /* |
312 | * In case the timing allocation fails, we just want to warn, | |
313 | * not fail, so letting the system boot anyway. | |
314 | */ | |
315 | ret = irq_timings_alloc(irq); | |
316 | if (ret) { | |
317 | pr_warn("Failed to allocate irq timing stats for irq%d (%d)", | |
318 | irq, ret); | |
319 | return; | |
320 | } | |
321 | ||
b2d3d61a DL |
322 | desc->istate |= IRQS_TIMINGS; |
323 | } | |
324 | ||
325 | extern void irq_timings_enable(void); | |
326 | extern void irq_timings_disable(void); | |
327 | ||
328 | DECLARE_STATIC_KEY_FALSE(irq_timing_enabled); | |
329 | ||
330 | /* | |
331 | * The interrupt number and the timestamp are encoded into a single | |
332 | * u64 variable to optimize the size. | |
333 | * 48 bit time stamp and 16 bit IRQ number is way sufficient. | |
334 | * Who cares an IRQ after 78 hours of idle time? | |
335 | */ | |
336 | static inline u64 irq_timing_encode(u64 timestamp, int irq) | |
337 | { | |
338 | return (timestamp << 16) | irq; | |
339 | } | |
340 | ||
341 | static inline int irq_timing_decode(u64 value, u64 *timestamp) | |
342 | { | |
343 | *timestamp = value >> 16; | |
344 | return value & U16_MAX; | |
345 | } | |
346 | ||
347 | /* | |
348 | * The function record_irq_time is only called in one place in the | |
349 | * interrupts handler. We want this function always inline so the code | |
350 | * inside is embedded in the function and the static key branching | |
351 | * code can act at the higher level. Without the explicit | |
352 | * __always_inline we can end up with a function call and a small | |
353 | * overhead in the hotpath for nothing. | |
354 | */ | |
355 | static __always_inline void record_irq_time(struct irq_desc *desc) | |
356 | { | |
357 | if (!static_branch_likely(&irq_timing_enabled)) | |
358 | return; | |
359 | ||
360 | if (desc->istate & IRQS_TIMINGS) { | |
361 | struct irq_timings *timings = this_cpu_ptr(&irq_timings); | |
362 | ||
363 | timings->values[timings->count & IRQ_TIMINGS_MASK] = | |
364 | irq_timing_encode(local_clock(), | |
365 | irq_desc_get_irq(desc)); | |
366 | ||
367 | timings->count++; | |
368 | } | |
369 | } | |
370 | #else | |
371 | static inline void irq_remove_timings(struct irq_desc *desc) {} | |
372 | static inline void irq_setup_timings(struct irq_desc *desc, | |
373 | struct irqaction *act) {}; | |
374 | static inline void record_irq_time(struct irq_desc *desc) {} | |
375 | #endif /* CONFIG_IRQ_TIMINGS */ | |
376 | ||
377 | ||
f1602039 BG |
378 | #ifdef CONFIG_GENERIC_IRQ_CHIP |
379 | void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, | |
380 | int num_ct, unsigned int irq_base, | |
381 | void __iomem *reg_base, irq_flow_handler_t handler); | |
382 | #else | |
383 | static inline void | |
384 | irq_init_generic_chip(struct irq_chip_generic *gc, const char *name, | |
385 | int num_ct, unsigned int irq_base, | |
386 | void __iomem *reg_base, irq_flow_handler_t handler) { } | |
387 | #endif /* CONFIG_GENERIC_IRQ_CHIP */ | |
087cdfb6 | 388 | |
137221df CH |
389 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
390 | static inline bool irq_can_move_pcntxt(struct irq_data *data) | |
391 | { | |
392 | return irqd_can_move_in_process_context(data); | |
393 | } | |
394 | static inline bool irq_move_pending(struct irq_data *data) | |
395 | { | |
396 | return irqd_is_setaffinity_pending(data); | |
397 | } | |
398 | static inline void | |
399 | irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) | |
400 | { | |
401 | cpumask_copy(desc->pending_mask, mask); | |
402 | } | |
403 | static inline void | |
404 | irq_get_pending(struct cpumask *mask, struct irq_desc *desc) | |
405 | { | |
406 | cpumask_copy(mask, desc->pending_mask); | |
407 | } | |
f0383c24 TG |
408 | static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) |
409 | { | |
410 | return desc->pending_mask; | |
411 | } | |
36d84fb4 | 412 | bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear); |
137221df CH |
413 | #else /* CONFIG_GENERIC_PENDING_IRQ */ |
414 | static inline bool irq_can_move_pcntxt(struct irq_data *data) | |
415 | { | |
416 | return true; | |
417 | } | |
418 | static inline bool irq_move_pending(struct irq_data *data) | |
419 | { | |
420 | return false; | |
421 | } | |
422 | static inline void | |
423 | irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) | |
424 | { | |
425 | } | |
426 | static inline void | |
427 | irq_get_pending(struct cpumask *mask, struct irq_desc *desc) | |
428 | { | |
429 | } | |
f0383c24 TG |
430 | static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc) |
431 | { | |
432 | return NULL; | |
433 | } | |
36d84fb4 TG |
434 | static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear) |
435 | { | |
436 | return false; | |
437 | } | |
f0383c24 | 438 | #endif /* !CONFIG_GENERIC_PENDING_IRQ */ |
137221df | 439 | |
087cdfb6 | 440 | #ifdef CONFIG_GENERIC_IRQ_DEBUGFS |
c2ce34c0 TG |
441 | #include <linux/debugfs.h> |
442 | ||
087cdfb6 | 443 | void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc); |
c2ce34c0 TG |
444 | static inline void irq_remove_debugfs_entry(struct irq_desc *desc) |
445 | { | |
446 | debugfs_remove(desc->debugfs_file); | |
447 | } | |
087cdfb6 TG |
448 | # ifdef CONFIG_IRQ_DOMAIN |
449 | void irq_domain_debugfs_init(struct dentry *root); | |
450 | # else | |
e5682b4e SO |
451 | static inline void irq_domain_debugfs_init(struct dentry *root) |
452 | { | |
453 | } | |
087cdfb6 TG |
454 | # endif |
455 | #else /* CONFIG_GENERIC_IRQ_DEBUGFS */ | |
456 | static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d) | |
457 | { | |
458 | } | |
459 | static inline void irq_remove_debugfs_entry(struct irq_desc *d) | |
460 | { | |
461 | } | |
462 | #endif /* CONFIG_GENERIC_IRQ_DEBUGFS */ |