Loading...
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
22extern bool noirqdebug;
23
24extern 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 */
33enum {
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 */
53enum {
54 IRQS_AUTODETECT = 0x00000001,
55 IRQS_SPURIOUS_DISABLED = 0x00000002,
56 IRQS_POLL_INPROGRESS = 0x00000008,
57 IRQS_ONESHOT = 0x00000020,
58 IRQS_REPLAY = 0x00000040,
59 IRQS_WAITING = 0x00000080,
60 IRQS_PENDING = 0x00000200,
61 IRQS_SUSPENDED = 0x00000800,
62 IRQS_TIMINGS = 0x00001000,
63};
64
65#include "debug.h"
66#include "settings.h"
67
68extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
69extern void __disable_irq(struct irq_desc *desc);
70extern void __enable_irq(struct irq_desc *desc);
71
72#define IRQ_RESEND true
73#define IRQ_NORESEND false
74
75#define IRQ_START_FORCE true
76#define IRQ_START_COND false
77
78extern int irq_activate(struct irq_desc *desc);
79extern int irq_activate_and_startup(struct irq_desc *desc, bool resend);
80extern int irq_startup(struct irq_desc *desc, bool resend, bool force);
81
82extern void irq_shutdown(struct irq_desc *desc);
83extern void irq_enable(struct irq_desc *desc);
84extern void irq_disable(struct irq_desc *desc);
85extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
86extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
87extern void mask_irq(struct irq_desc *desc);
88extern void unmask_irq(struct irq_desc *desc);
89extern void unmask_threaded_irq(struct irq_desc *desc);
90
91#ifdef CONFIG_SPARSE_IRQ
92static inline void irq_mark_irq(unsigned int irq) { }
93#else
94extern void irq_mark_irq(unsigned int irq);
95#endif
96
97extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
98
99irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags);
100irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
101irqreturn_t handle_irq_event(struct irq_desc *desc);
102
103/* Resending of interrupts :*/
104void check_irq_resend(struct irq_desc *desc);
105bool irq_wait_for_poll(struct irq_desc *desc);
106void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
107
108#ifdef CONFIG_PROC_FS
109extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
110extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
111extern void register_handler_proc(unsigned int irq, struct irqaction *action);
112extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
113#else
114static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
115static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
116static inline void register_handler_proc(unsigned int irq,
117 struct irqaction *action) { }
118static inline void unregister_handler_proc(unsigned int irq,
119 struct irqaction *action) { }
120#endif
121
122extern bool irq_can_set_affinity_usr(unsigned int irq);
123
124extern int irq_select_affinity_usr(unsigned int irq);
125
126extern void irq_set_thread_affinity(struct irq_desc *desc);
127
128extern int irq_do_set_affinity(struct irq_data *data,
129 const struct cpumask *dest, bool force);
130
131#ifdef CONFIG_SMP
132extern int irq_setup_affinity(struct irq_desc *desc);
133#else
134static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; }
135#endif
136
137/* Inline functions for support of irq chips on slow busses */
138static inline void chip_bus_lock(struct irq_desc *desc)
139{
140 if (unlikely(desc->irq_data.chip->irq_bus_lock))
141 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
142}
143
144static inline void chip_bus_sync_unlock(struct irq_desc *desc)
145{
146 if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
147 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
148}
149
150#define _IRQ_DESC_CHECK (1 << 0)
151#define _IRQ_DESC_PERCPU (1 << 1)
152
153#define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK)
154#define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
155
156#define for_each_action_of_desc(desc, act) \
157 for (act = desc->action; act; act = act->next)
158
159struct irq_desc *
160__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
161 unsigned int check);
162void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
163
164static inline struct irq_desc *
165irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
166{
167 return __irq_get_desc_lock(irq, flags, true, check);
168}
169
170static inline void
171irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
172{
173 __irq_put_desc_unlock(desc, flags, true);
174}
175
176static inline struct irq_desc *
177irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
178{
179 return __irq_get_desc_lock(irq, flags, false, check);
180}
181
182static inline void
183irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
184{
185 __irq_put_desc_unlock(desc, flags, false);
186}
187
188#define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
189
190static inline unsigned int irqd_get(struct irq_data *d)
191{
192 return __irqd_to_state(d);
193}
194
195/*
196 * Manipulation functions for irq_data.state
197 */
198static inline void irqd_set_move_pending(struct irq_data *d)
199{
200 __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
201}
202
203static inline void irqd_clr_move_pending(struct irq_data *d)
204{
205 __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
206}
207
208static inline void irqd_set_managed_shutdown(struct irq_data *d)
209{
210 __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN;
211}
212
213static inline void irqd_clr_managed_shutdown(struct irq_data *d)
214{
215 __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN;
216}
217
218static inline void irqd_clear(struct irq_data *d, unsigned int mask)
219{
220 __irqd_to_state(d) &= ~mask;
221}
222
223static inline void irqd_set(struct irq_data *d, unsigned int mask)
224{
225 __irqd_to_state(d) |= mask;
226}
227
228static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
229{
230 return __irqd_to_state(d) & mask;
231}
232
233static inline void irq_state_set_disabled(struct irq_desc *desc)
234{
235 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
236}
237
238static inline void irq_state_set_masked(struct irq_desc *desc)
239{
240 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
241}
242
243#undef __irqd_to_state
244
245static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
246{
247 __this_cpu_inc(*desc->kstat_irqs);
248 __this_cpu_inc(kstat.irqs_sum);
249}
250
251static inline int irq_desc_get_node(struct irq_desc *desc)
252{
253 return irq_common_data_get_node(&desc->irq_common_data);
254}
255
256static inline int irq_desc_is_chained(struct irq_desc *desc)
257{
258 return (desc->action && desc->action == &chained_action);
259}
260
261#ifdef CONFIG_PM_SLEEP
262bool irq_pm_check_wakeup(struct irq_desc *desc);
263void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
264void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
265#else
266static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
267static inline void
268irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
269static inline void
270irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
271#endif
272
273#ifdef CONFIG_IRQ_TIMINGS
274
275#define IRQ_TIMINGS_SHIFT 5
276#define IRQ_TIMINGS_SIZE (1 << IRQ_TIMINGS_SHIFT)
277#define IRQ_TIMINGS_MASK (IRQ_TIMINGS_SIZE - 1)
278
279/**
280 * struct irq_timings - irq timings storing structure
281 * @values: a circular buffer of u64 encoded <timestamp,irq> values
282 * @count: the number of elements in the array
283 */
284struct irq_timings {
285 u64 values[IRQ_TIMINGS_SIZE];
286 int count;
287};
288
289DECLARE_PER_CPU(struct irq_timings, irq_timings);
290
291extern void irq_timings_free(int irq);
292extern int irq_timings_alloc(int irq);
293
294static inline void irq_remove_timings(struct irq_desc *desc)
295{
296 desc->istate &= ~IRQS_TIMINGS;
297
298 irq_timings_free(irq_desc_get_irq(desc));
299}
300
301static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act)
302{
303 int irq = irq_desc_get_irq(desc);
304 int ret;
305
306 /*
307 * We don't need the measurement because the idle code already
308 * knows the next expiry event.
309 */
310 if (act->flags & __IRQF_TIMER)
311 return;
312
313 /*
314 * In case the timing allocation fails, we just want to warn,
315 * not fail, so letting the system boot anyway.
316 */
317 ret = irq_timings_alloc(irq);
318 if (ret) {
319 pr_warn("Failed to allocate irq timing stats for irq%d (%d)",
320 irq, ret);
321 return;
322 }
323
324 desc->istate |= IRQS_TIMINGS;
325}
326
327extern void irq_timings_enable(void);
328extern void irq_timings_disable(void);
329
330DECLARE_STATIC_KEY_FALSE(irq_timing_enabled);
331
332/*
333 * The interrupt number and the timestamp are encoded into a single
334 * u64 variable to optimize the size.
335 * 48 bit time stamp and 16 bit IRQ number is way sufficient.
336 * Who cares an IRQ after 78 hours of idle time?
337 */
338static inline u64 irq_timing_encode(u64 timestamp, int irq)
339{
340 return (timestamp << 16) | irq;
341}
342
343static inline int irq_timing_decode(u64 value, u64 *timestamp)
344{
345 *timestamp = value >> 16;
346 return value & U16_MAX;
347}
348
349/*
350 * The function record_irq_time is only called in one place in the
351 * interrupts handler. We want this function always inline so the code
352 * inside is embedded in the function and the static key branching
353 * code can act at the higher level. Without the explicit
354 * __always_inline we can end up with a function call and a small
355 * overhead in the hotpath for nothing.
356 */
357static __always_inline void record_irq_time(struct irq_desc *desc)
358{
359 if (!static_branch_likely(&irq_timing_enabled))
360 return;
361
362 if (desc->istate & IRQS_TIMINGS) {
363 struct irq_timings *timings = this_cpu_ptr(&irq_timings);
364
365 timings->values[timings->count & IRQ_TIMINGS_MASK] =
366 irq_timing_encode(local_clock(),
367 irq_desc_get_irq(desc));
368
369 timings->count++;
370 }
371}
372#else
373static inline void irq_remove_timings(struct irq_desc *desc) {}
374static inline void irq_setup_timings(struct irq_desc *desc,
375 struct irqaction *act) {};
376static inline void record_irq_time(struct irq_desc *desc) {}
377#endif /* CONFIG_IRQ_TIMINGS */
378
379
380#ifdef CONFIG_GENERIC_IRQ_CHIP
381void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
382 int num_ct, unsigned int irq_base,
383 void __iomem *reg_base, irq_flow_handler_t handler);
384#else
385static inline void
386irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
387 int num_ct, unsigned int irq_base,
388 void __iomem *reg_base, irq_flow_handler_t handler) { }
389#endif /* CONFIG_GENERIC_IRQ_CHIP */
390
391#ifdef CONFIG_GENERIC_PENDING_IRQ
392static inline bool irq_can_move_pcntxt(struct irq_data *data)
393{
394 return irqd_can_move_in_process_context(data);
395}
396static inline bool irq_move_pending(struct irq_data *data)
397{
398 return irqd_is_setaffinity_pending(data);
399}
400static inline void
401irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
402{
403 cpumask_copy(desc->pending_mask, mask);
404}
405static inline void
406irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
407{
408 cpumask_copy(mask, desc->pending_mask);
409}
410static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
411{
412 return desc->pending_mask;
413}
414bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear);
415#else /* CONFIG_GENERIC_PENDING_IRQ */
416static inline bool irq_can_move_pcntxt(struct irq_data *data)
417{
418 return true;
419}
420static inline bool irq_move_pending(struct irq_data *data)
421{
422 return false;
423}
424static inline void
425irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
426{
427}
428static inline void
429irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
430{
431}
432static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
433{
434 return NULL;
435}
436static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
437{
438 return false;
439}
440#endif /* !CONFIG_GENERIC_PENDING_IRQ */
441
442#if !defined(CONFIG_IRQ_DOMAIN) || !defined(CONFIG_IRQ_DOMAIN_HIERARCHY)
443static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve)
444{
445 irqd_set_activated(data);
446 return 0;
447}
448static inline void irq_domain_deactivate_irq(struct irq_data *data)
449{
450 irqd_clr_activated(data);
451}
452#endif
453
454#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
455#include <linux/debugfs.h>
456
457void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc);
458static inline void irq_remove_debugfs_entry(struct irq_desc *desc)
459{
460 debugfs_remove(desc->debugfs_file);
461 kfree(desc->dev_name);
462}
463void irq_debugfs_copy_devname(int irq, struct device *dev);
464# ifdef CONFIG_IRQ_DOMAIN
465void irq_domain_debugfs_init(struct dentry *root);
466# else
467static inline void irq_domain_debugfs_init(struct dentry *root)
468{
469}
470# endif
471#else /* CONFIG_GENERIC_IRQ_DEBUGFS */
472static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d)
473{
474}
475static inline void irq_remove_debugfs_entry(struct irq_desc *d)
476{
477}
478static inline void irq_debugfs_copy_devname(int irq, struct device *dev)
479{
480}
481#endif /* CONFIG_GENERIC_IRQ_DEBUGFS */
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
22extern bool noirqdebug;
23
24extern 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 */
34enum {
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 */
60enum {
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
77extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
78extern void __disable_irq(struct irq_desc *desc);
79extern 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
87extern int irq_activate(struct irq_desc *desc);
88extern int irq_activate_and_startup(struct irq_desc *desc, bool resend);
89extern int irq_startup(struct irq_desc *desc, bool resend, bool force);
90
91extern void irq_shutdown(struct irq_desc *desc);
92extern void irq_shutdown_and_deactivate(struct irq_desc *desc);
93extern void irq_enable(struct irq_desc *desc);
94extern void irq_disable(struct irq_desc *desc);
95extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
96extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
97extern void mask_irq(struct irq_desc *desc);
98extern void unmask_irq(struct irq_desc *desc);
99extern void unmask_threaded_irq(struct irq_desc *desc);
100
101extern unsigned int kstat_irqs_desc(struct irq_desc *desc, const struct cpumask *cpumask);
102
103#ifdef CONFIG_SPARSE_IRQ
104static inline void irq_mark_irq(unsigned int irq) { }
105#else
106extern void irq_mark_irq(unsigned int irq);
107#endif
108
109extern int __irq_get_irqchip_state(struct irq_data *data,
110 enum irqchip_irq_state which,
111 bool *state);
112
113irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc);
114irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
115irqreturn_t handle_irq_event(struct irq_desc *desc);
116
117/* Resending of interrupts :*/
118int check_irq_resend(struct irq_desc *desc, bool inject);
119void clear_irq_resend(struct irq_desc *desc);
120void irq_resend_init(struct irq_desc *desc);
121bool irq_wait_for_poll(struct irq_desc *desc);
122void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
123
124void wake_threads_waitq(struct irq_desc *desc);
125
126#ifdef CONFIG_PROC_FS
127extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
128extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
129extern void register_handler_proc(unsigned int irq, struct irqaction *action);
130extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
131#else
132static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
133static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
134static inline void register_handler_proc(unsigned int irq,
135 struct irqaction *action) { }
136static inline void unregister_handler_proc(unsigned int irq,
137 struct irqaction *action) { }
138#endif
139
140extern bool irq_can_set_affinity_usr(unsigned int irq);
141
142extern void irq_set_thread_affinity(struct irq_desc *desc);
143
144extern int irq_do_set_affinity(struct irq_data *data,
145 const struct cpumask *dest, bool force);
146
147#ifdef CONFIG_SMP
148extern int irq_setup_affinity(struct irq_desc *desc);
149#else
150static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; }
151#endif
152
153/* Inline functions for support of irq chips on slow busses */
154static inline void chip_bus_lock(struct irq_desc *desc)
155{
156 if (unlikely(desc->irq_data.chip->irq_bus_lock))
157 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
158}
159
160static inline void chip_bus_sync_unlock(struct irq_desc *desc)
161{
162 if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
163 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
164}
165
166#define _IRQ_DESC_CHECK (1 << 0)
167#define _IRQ_DESC_PERCPU (1 << 1)
168
169#define IRQ_GET_DESC_CHECK_GLOBAL (_IRQ_DESC_CHECK)
170#define IRQ_GET_DESC_CHECK_PERCPU (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
171
172#define for_each_action_of_desc(desc, act) \
173 for (act = desc->action; act; act = act->next)
174
175struct irq_desc *
176__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
177 unsigned int check);
178void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
179
180static inline struct irq_desc *
181irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
182{
183 return __irq_get_desc_lock(irq, flags, true, check);
184}
185
186static inline void
187irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
188{
189 __irq_put_desc_unlock(desc, flags, true);
190}
191
192static inline struct irq_desc *
193irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
194{
195 return __irq_get_desc_lock(irq, flags, false, check);
196}
197
198static inline void
199irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
200{
201 __irq_put_desc_unlock(desc, flags, false);
202}
203
204#define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
205
206static inline unsigned int irqd_get(struct irq_data *d)
207{
208 return __irqd_to_state(d);
209}
210
211/*
212 * Manipulation functions for irq_data.state
213 */
214static inline void irqd_set_move_pending(struct irq_data *d)
215{
216 __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
217}
218
219static inline void irqd_clr_move_pending(struct irq_data *d)
220{
221 __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
222}
223
224static inline void irqd_set_managed_shutdown(struct irq_data *d)
225{
226 __irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN;
227}
228
229static inline void irqd_clr_managed_shutdown(struct irq_data *d)
230{
231 __irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN;
232}
233
234static inline void irqd_clear(struct irq_data *d, unsigned int mask)
235{
236 __irqd_to_state(d) &= ~mask;
237}
238
239static inline void irqd_set(struct irq_data *d, unsigned int mask)
240{
241 __irqd_to_state(d) |= mask;
242}
243
244static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
245{
246 return __irqd_to_state(d) & mask;
247}
248
249static inline void irq_state_set_disabled(struct irq_desc *desc)
250{
251 irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
252}
253
254static inline void irq_state_set_masked(struct irq_desc *desc)
255{
256 irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
257}
258
259#undef __irqd_to_state
260
261static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc)
262{
263 __this_cpu_inc(desc->kstat_irqs->cnt);
264 __this_cpu_inc(kstat.irqs_sum);
265}
266
267static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
268{
269 __kstat_incr_irqs_this_cpu(desc);
270 desc->tot_count++;
271}
272
273static inline int irq_desc_get_node(struct irq_desc *desc)
274{
275 return irq_common_data_get_node(&desc->irq_common_data);
276}
277
278static inline int irq_desc_is_chained(struct irq_desc *desc)
279{
280 return (desc->action && desc->action == &chained_action);
281}
282
283static inline bool irq_is_nmi(struct irq_desc *desc)
284{
285 return desc->istate & IRQS_NMI;
286}
287
288#ifdef CONFIG_PM_SLEEP
289bool irq_pm_check_wakeup(struct irq_desc *desc);
290void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
291void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
292#else
293static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
294static inline void
295irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
296static inline void
297irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
298#endif
299
300#ifdef CONFIG_IRQ_TIMINGS
301
302#define IRQ_TIMINGS_SHIFT 5
303#define IRQ_TIMINGS_SIZE (1 << IRQ_TIMINGS_SHIFT)
304#define IRQ_TIMINGS_MASK (IRQ_TIMINGS_SIZE - 1)
305
306/**
307 * struct irq_timings - irq timings storing structure
308 * @values: a circular buffer of u64 encoded <timestamp,irq> values
309 * @count: the number of elements in the array
310 */
311struct irq_timings {
312 u64 values[IRQ_TIMINGS_SIZE];
313 int count;
314};
315
316DECLARE_PER_CPU(struct irq_timings, irq_timings);
317
318extern void irq_timings_free(int irq);
319extern int irq_timings_alloc(int irq);
320
321static inline void irq_remove_timings(struct irq_desc *desc)
322{
323 desc->istate &= ~IRQS_TIMINGS;
324
325 irq_timings_free(irq_desc_get_irq(desc));
326}
327
328static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act)
329{
330 int irq = irq_desc_get_irq(desc);
331 int ret;
332
333 /*
334 * We don't need the measurement because the idle code already
335 * knows the next expiry event.
336 */
337 if (act->flags & __IRQF_TIMER)
338 return;
339
340 /*
341 * In case the timing allocation fails, we just want to warn,
342 * not fail, so letting the system boot anyway.
343 */
344 ret = irq_timings_alloc(irq);
345 if (ret) {
346 pr_warn("Failed to allocate irq timing stats for irq%d (%d)",
347 irq, ret);
348 return;
349 }
350
351 desc->istate |= IRQS_TIMINGS;
352}
353
354extern void irq_timings_enable(void);
355extern void irq_timings_disable(void);
356
357DECLARE_STATIC_KEY_FALSE(irq_timing_enabled);
358
359/*
360 * The interrupt number and the timestamp are encoded into a single
361 * u64 variable to optimize the size.
362 * 48 bit time stamp and 16 bit IRQ number is way sufficient.
363 * Who cares an IRQ after 78 hours of idle time?
364 */
365static inline u64 irq_timing_encode(u64 timestamp, int irq)
366{
367 return (timestamp << 16) | irq;
368}
369
370static inline int irq_timing_decode(u64 value, u64 *timestamp)
371{
372 *timestamp = value >> 16;
373 return value & U16_MAX;
374}
375
376static __always_inline void irq_timings_push(u64 ts, int irq)
377{
378 struct irq_timings *timings = this_cpu_ptr(&irq_timings);
379
380 timings->values[timings->count & IRQ_TIMINGS_MASK] =
381 irq_timing_encode(ts, irq);
382
383 timings->count++;
384}
385
386/*
387 * The function record_irq_time is only called in one place in the
388 * interrupts handler. We want this function always inline so the code
389 * inside is embedded in the function and the static key branching
390 * code can act at the higher level. Without the explicit
391 * __always_inline we can end up with a function call and a small
392 * overhead in the hotpath for nothing.
393 */
394static __always_inline void record_irq_time(struct irq_desc *desc)
395{
396 if (!static_branch_likely(&irq_timing_enabled))
397 return;
398
399 if (desc->istate & IRQS_TIMINGS)
400 irq_timings_push(local_clock(), irq_desc_get_irq(desc));
401}
402#else
403static inline void irq_remove_timings(struct irq_desc *desc) {}
404static inline void irq_setup_timings(struct irq_desc *desc,
405 struct irqaction *act) {};
406static inline void record_irq_time(struct irq_desc *desc) {}
407#endif /* CONFIG_IRQ_TIMINGS */
408
409
410#ifdef CONFIG_GENERIC_IRQ_CHIP
411void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
412 int num_ct, unsigned int irq_base,
413 void __iomem *reg_base, irq_flow_handler_t handler);
414#else
415static inline void
416irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
417 int num_ct, unsigned int irq_base,
418 void __iomem *reg_base, irq_flow_handler_t handler) { }
419#endif /* CONFIG_GENERIC_IRQ_CHIP */
420
421#ifdef CONFIG_GENERIC_PENDING_IRQ
422static inline bool irq_can_move_pcntxt(struct irq_data *data)
423{
424 return irqd_can_move_in_process_context(data);
425}
426static inline bool irq_move_pending(struct irq_data *data)
427{
428 return irqd_is_setaffinity_pending(data);
429}
430static inline void
431irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
432{
433 cpumask_copy(desc->pending_mask, mask);
434}
435static inline void
436irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
437{
438 cpumask_copy(mask, desc->pending_mask);
439}
440static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
441{
442 return desc->pending_mask;
443}
444bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear);
445#else /* CONFIG_GENERIC_PENDING_IRQ */
446static inline bool irq_can_move_pcntxt(struct irq_data *data)
447{
448 return true;
449}
450static inline bool irq_move_pending(struct irq_data *data)
451{
452 return false;
453}
454static inline void
455irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
456{
457}
458static inline void
459irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
460{
461}
462static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
463{
464 return NULL;
465}
466static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
467{
468 return false;
469}
470#endif /* !CONFIG_GENERIC_PENDING_IRQ */
471
472static inline bool handle_enforce_irqctx(struct irq_data *data)
473{
474 return irqd_is_handle_enforce_irqctx(data);
475}
476
477#if !defined(CONFIG_IRQ_DOMAIN) || !defined(CONFIG_IRQ_DOMAIN_HIERARCHY)
478static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve)
479{
480 irqd_set_activated(data);
481 return 0;
482}
483static inline void irq_domain_deactivate_irq(struct irq_data *data)
484{
485 irqd_clr_activated(data);
486}
487#endif
488
489static inline struct irq_data *irqd_get_parent_data(struct irq_data *irqd)
490{
491#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
492 return irqd->parent_data;
493#else
494 return NULL;
495#endif
496}
497
498#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
499#include <linux/debugfs.h>
500
501struct irq_bit_descr {
502 unsigned int mask;
503 char *name;
504};
505
506#define BIT_MASK_DESCR(m) { .mask = m, .name = #m }
507
508void irq_debug_show_bits(struct seq_file *m, int ind, unsigned int state,
509 const struct irq_bit_descr *sd, int size);
510
511void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc);
512static inline void irq_remove_debugfs_entry(struct irq_desc *desc)
513{
514 debugfs_remove(desc->debugfs_file);
515 kfree(desc->dev_name);
516}
517void irq_debugfs_copy_devname(int irq, struct device *dev);
518# ifdef CONFIG_IRQ_DOMAIN
519void irq_domain_debugfs_init(struct dentry *root);
520# else
521static inline void irq_domain_debugfs_init(struct dentry *root)
522{
523}
524# endif
525#else /* CONFIG_GENERIC_IRQ_DEBUGFS */
526static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d)
527{
528}
529static inline void irq_remove_debugfs_entry(struct irq_desc *d)
530{
531}
532static inline void irq_debugfs_copy_devname(int irq, struct device *dev)
533{
534}
535#endif /* CONFIG_GENERIC_IRQ_DEBUGFS */