summaryrefslogtreecommitdiff
path: root/kernel/irq/internals.h
blob: 21f9927ff5ad6c7e52b2e0b993d28cb08034e3e9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * IRQ subsystem internal functions and variables:
 *
 * Do not ever include this file from anything else than
 * kernel/irq/. Do not even think about using any information outside
 * of this file for your non core code.
 */
#include <linux/irqdesc.h>
#include <linux/kernel_stat.h>
#include <linux/pm_runtime.h>
#include <linux/sched/clock.h>

#ifdef CONFIG_SPARSE_IRQ
# define IRQ_BITMAP_BITS	(NR_IRQS + 8196)
#else
# define IRQ_BITMAP_BITS	NR_IRQS
#endif

#define istate core_internal_state__do_not_mess_with_it

extern bool noirqdebug;

extern struct irqaction chained_action;

/*
 * Bits used by threaded handlers:
 * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
 * IRQTF_WARNED    - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
 * IRQTF_AFFINITY  - irq thread is requested to adjust affinity
 * IRQTF_FORCED_THREAD  - irq action is force threaded
 */
enum {
	IRQTF_RUNTHREAD,
	IRQTF_WARNED,
	IRQTF_AFFINITY,
	IRQTF_FORCED_THREAD,
};

/*
 * Bit masks for desc->core_internal_state__do_not_mess_with_it
 *
 * IRQS_AUTODETECT		- autodetection in progress
 * IRQS_SPURIOUS_DISABLED	- was disabled due to spurious interrupt
 *				  detection
 * IRQS_POLL_INPROGRESS		- polling in progress
 * IRQS_ONESHOT			- irq is not unmasked in primary handler
 * IRQS_REPLAY			- irq is replayed
 * IRQS_WAITING			- irq is waiting
 * IRQS_PENDING			- irq is pending and replayed later
 * IRQS_SUSPENDED		- irq is suspended
 * IRQS_NMI			- irq line is used to deliver NMIs
 */
enum {
	IRQS_AUTODETECT		= 0x00000001,
	IRQS_SPURIOUS_DISABLED	= 0x00000002,
	IRQS_POLL_INPROGRESS	= 0x00000008,
	IRQS_ONESHOT		= 0x00000020,
	IRQS_REPLAY		= 0x00000040,
	IRQS_WAITING		= 0x00000080,
	IRQS_PENDING		= 0x00000200,
	IRQS_SUSPENDED		= 0x00000800,
	IRQS_TIMINGS		= 0x00001000,
	IRQS_NMI		= 0x00002000,
};

#include "debug.h"
#include "settings.h"

extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
extern void __disable_irq(struct irq_desc *desc);
extern void __enable_irq(struct irq_desc *desc);

#define IRQ_RESEND	true
#define IRQ_NORESEND	false

#define IRQ_START_FORCE	true
#define IRQ_START_COND	false

extern int irq_activate(struct irq_desc *desc);
extern int irq_activate_and_startup(struct irq_desc *desc, bool resend);
extern int irq_startup(struct irq_desc *desc, bool resend, bool force);

extern void irq_shutdown(struct irq_desc *desc);
extern void irq_enable(struct irq_desc *desc);
extern void irq_disable(struct irq_desc *desc);
extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
extern void mask_irq(struct irq_desc *desc);
extern void unmask_irq(struct irq_desc *desc);
extern void unmask_threaded_irq(struct irq_desc *desc);

#ifdef CONFIG_SPARSE_IRQ
static inline void irq_mark_irq(unsigned int irq) { }
#else
extern void irq_mark_irq(unsigned int irq);
#endif

extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);

irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags);
irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
irqreturn_t handle_irq_event(struct irq_desc *desc);

/* Resending of interrupts :*/
void check_irq_resend(struct irq_desc *desc);
bool irq_wait_for_poll(struct irq_desc *desc);
void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);

#ifdef CONFIG_PROC_FS
extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
extern void register_handler_proc(unsigned int irq, struct irqaction *action);
extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
#else
static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
static inline void register_handler_proc(unsigned int irq,
					 struct irqaction *action) { }
static inline void unregister_handler_proc(unsigned int irq,
					   struct irqaction *action) { }
#endif

extern bool irq_can_set_affinity_usr(unsigned int irq);

extern int irq_select_affinity_usr(unsigned int irq);

extern void irq_set_thread_affinity(struct irq_desc *desc);

extern int irq_do_set_affinity(struct irq_data *data,
			       const struct cpumask *dest, bool force);

#ifdef CONFIG_SMP
extern int irq_setup_affinity(struct irq_desc *desc);
#else
static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; }
#endif

/* Inline functions for support of irq chips on slow busses */
static inline void chip_bus_lock(struct irq_desc *desc)
{
	if (unlikely(desc->irq_data.chip->irq_bus_lock))
		desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
}

static inline void chip_bus_sync_unlock(struct irq_desc *desc)
{
	if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
		desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
}

#define _IRQ_DESC_CHECK		(1 << 0)
#define _IRQ_DESC_PERCPU	(1 << 1)

#define IRQ_GET_DESC_CHECK_GLOBAL	(_IRQ_DESC_CHECK)
#define IRQ_GET_DESC_CHECK_PERCPU	(_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)

#define for_each_action_of_desc(desc, act)			\
	for (act = desc->action; act; act = act->next)

struct irq_desc *
__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
		    unsigned int check);
void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);

static inline struct irq_desc *
irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
{
	return __irq_get_desc_lock(irq, flags, true, check);
}

static inline void
irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
{
	__irq_put_desc_unlock(desc, flags, true);
}

static inline struct irq_desc *
irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
{
	return __irq_get_desc_lock(irq, flags, false, check);
}

static inline void
irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
{
	__irq_put_desc_unlock(desc, flags, false);
}

#define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)

static inline unsigned int irqd_get(struct irq_data *d)
{
	return __irqd_to_state(d);
}

/*
 * Manipulation functions for irq_data.state
 */
static inline void irqd_set_move_pending(struct irq_data *d)
{
	__irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
}

static inline void irqd_clr_move_pending(struct irq_data *d)
{
	__irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
}

static inline void irqd_set_managed_shutdown(struct irq_data *d)
{
	__irqd_to_state(d) |= IRQD_MANAGED_SHUTDOWN;
}

static inline void irqd_clr_managed_shutdown(struct irq_data *d)
{
	__irqd_to_state(d) &= ~IRQD_MANAGED_SHUTDOWN;
}

static inline void irqd_clear(struct irq_data *d, unsigned int mask)
{
	__irqd_to_state(d) &= ~mask;
}

static inline void irqd_set(struct irq_data *d, unsigned int mask)
{
	__irqd_to_state(d) |= mask;
}

static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
{
	return __irqd_to_state(d) & mask;
}

static inline void irq_state_set_disabled(struct irq_desc *desc)
{
	irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
}

static inline void irq_state_set_masked(struct irq_desc *desc)
{
	irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
}

#undef __irqd_to_state

static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc)
{
	__this_cpu_inc(*desc->kstat_irqs);
	__this_cpu_inc(kstat.irqs_sum);
}

static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
{
	__kstat_incr_irqs_this_cpu(desc);
	desc->tot_count++;
}

static inline int irq_desc_get_node(struct irq_desc *desc)
{
	return irq_common_data_get_node(&desc->irq_common_data);
}

static inline int irq_desc_is_chained(struct irq_desc *desc)
{
	return (desc->action && desc->action == &chained_action);
}

#ifdef CONFIG_PM_SLEEP
bool irq_pm_check_wakeup(struct irq_desc *desc);
void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
#else
static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
static inline void
irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
static inline void
irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
#endif

#ifdef CONFIG_IRQ_TIMINGS

#define IRQ_TIMINGS_SHIFT	5
#define IRQ_TIMINGS_SIZE	(1 << IRQ_TIMINGS_SHIFT)
#define IRQ_TIMINGS_MASK	(IRQ_TIMINGS_SIZE - 1)

/**
 * struct irq_timings - irq timings storing structure
 * @values: a circular buffer of u64 encoded <timestamp,irq> values
 * @count: the number of elements in the array
 */
struct irq_timings {
	u64	values[IRQ_TIMINGS_SIZE];
	int	count;
};

DECLARE_PER_CPU(struct irq_timings, irq_timings);

extern void irq_timings_free(int irq);
extern int irq_timings_alloc(int irq);

static inline void irq_remove_timings(struct irq_desc *desc)
{
	desc->istate &= ~IRQS_TIMINGS;

	irq_timings_free(irq_desc_get_irq(desc));
}

static inline void irq_setup_timings(struct irq_desc *desc, struct irqaction *act)
{
	int irq = irq_desc_get_irq(desc);
	int ret;

	/*
	 * We don't need the measurement because the idle code already
	 * knows the next expiry event.
	 */
	if (act->flags & __IRQF_TIMER)
		return;

	/*
	 * In case the timing allocation fails, we just want to warn,
	 * not fail, so letting the system boot anyway.
	 */
	ret = irq_timings_alloc(irq);
	if (ret) {
		pr_warn("Failed to allocate irq timing stats for irq%d (%d)",
			irq, ret);
		return;
	}

	desc->istate |= IRQS_TIMINGS;
}

extern void irq_timings_enable(void);
extern void irq_timings_disable(void);

DECLARE_STATIC_KEY_FALSE(irq_timing_enabled);

/*
 * The interrupt number and the timestamp are encoded into a single
 * u64 variable to optimize the size.
 * 48 bit time stamp and 16 bit IRQ number is way sufficient.
 *  Who cares an IRQ after 78 hours of idle time?
 */
static inline u64 irq_timing_encode(u64 timestamp, int irq)
{
	return (timestamp << 16) | irq;
}

static inline int irq_timing_decode(u64 value, u64 *timestamp)
{
	*timestamp = value >> 16;
	return value & U16_MAX;
}

static __always_inline void irq_timings_push(u64 ts, int irq)
{
	struct irq_timings *timings = this_cpu_ptr(&irq_timings);

	timings->values[timings->count & IRQ_TIMINGS_MASK] =
		irq_timing_encode(ts, irq);

	timings->count++;
}

/*
 * The function record_irq_time is only called in one place in the
 * interrupts handler. We want this function always inline so the code
 * inside is embedded in the function and the static key branching
 * code can act at the higher level. Without the explicit
 * __always_inline we can end up with a function call and a small
 * overhead in the hotpath for nothing.
 */
static __always_inline void record_irq_time(struct irq_desc *desc)
{
	if (!static_branch_likely(&irq_timing_enabled))
		return;

	if (desc->istate & IRQS_TIMINGS)
		irq_timings_push(local_clock(), irq_desc_get_irq(desc));
}
#else
static inline void irq_remove_timings(struct irq_desc *desc) {}
static inline void irq_setup_timings(struct irq_desc *desc,
				     struct irqaction *act) {};
static inline void record_irq_time(struct irq_desc *desc) {}
#endif /* CONFIG_IRQ_TIMINGS */


#ifdef CONFIG_GENERIC_IRQ_CHIP
void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
			   int num_ct, unsigned int irq_base,
			   void __iomem *reg_base, irq_flow_handler_t handler);
#else
static inline void
irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
		      int num_ct, unsigned int irq_base,
		      void __iomem *reg_base, irq_flow_handler_t handler) { }
#endif /* CONFIG_GENERIC_IRQ_CHIP */

#ifdef CONFIG_GENERIC_PENDING_IRQ
static inline bool irq_can_move_pcntxt(struct irq_data *data)
{
	return irqd_can_move_in_process_context(data);
}
static inline bool irq_move_pending(struct irq_data *data)
{
	return irqd_is_setaffinity_pending(data);
}
static inline void
irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
{
	cpumask_copy(desc->pending_mask, mask);
}
static inline void
irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
{
	cpumask_copy(mask, desc->pending_mask);
}
static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
{
	return desc->pending_mask;
}
bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear);
#else /* CONFIG_GENERIC_PENDING_IRQ */
static inline bool irq_can_move_pcntxt(struct irq_data *data)
{
	return true;
}
static inline bool irq_move_pending(struct irq_data *data)
{
	return false;
}
static inline void
irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask)
{
}
static inline void
irq_get_pending(struct cpumask *mask, struct irq_desc *desc)
{
}
static inline struct cpumask *irq_desc_get_pending_mask(struct irq_desc *desc)
{
	return NULL;
}
static inline bool irq_fixup_move_pending(struct irq_desc *desc, bool fclear)
{
	return false;
}
#endif /* !CONFIG_GENERIC_PENDING_IRQ */

#if !defined(CONFIG_IRQ_DOMAIN) || !defined(CONFIG_IRQ_DOMAIN_HIERARCHY)
static inline int irq_domain_activate_irq(struct irq_data *data, bool reserve)
{
	irqd_set_activated(data);
	return 0;
}
static inline void irq_domain_deactivate_irq(struct irq_data *data)
{
	irqd_clr_activated(data);
}
#endif

#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
#include <linux/debugfs.h>

void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc);
static inline void irq_remove_debugfs_entry(struct irq_desc *desc)
{
	debugfs_remove(desc->debugfs_file);
	kfree(desc->dev_name);
}
void irq_debugfs_copy_devname(int irq, struct device *dev);
# ifdef CONFIG_IRQ_DOMAIN
void irq_domain_debugfs_init(struct dentry *root);
# else
static inline void irq_domain_debugfs_init(struct dentry *root)
{
}
# endif
#else /* CONFIG_GENERIC_IRQ_DEBUGFS */
static inline void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *d)
{
}
static inline void irq_remove_debugfs_entry(struct irq_desc *d)
{
}
static inline void irq_debugfs_copy_devname(int irq, struct device *dev)
{
}
#endif /* CONFIG_GENERIC_IRQ_DEBUGFS */