summaryrefslogtreecommitdiffstats
path: root/include/linux/irq.h
blob: c2a0c192969084f17937996e201fb74121331b4b (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
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
#ifndef _LINUX_IRQ_H
#define _LINUX_IRQ_H

/*
 * Please do not include this file in generic code.  There is currently
 * no requirement for any architecture to implement anything held
 * within this file.
 *
 * Thanks. --rmk
 */

#include <linux/smp.h>

#ifndef CONFIG_S390

#include <linux/linkage.h>
#include <linux/cache.h>
#include <linux/spinlock.h>
#include <linux/cpumask.h>
#include <linux/gfp.h>
#include <linux/irqreturn.h>
#include <linux/irqnr.h>
#include <linux/errno.h>
#include <linux/topology.h>
#include <linux/wait.h>

#include <asm/irq.h>
#include <asm/ptrace.h>
#include <asm/irq_regs.h>

struct seq_file;
struct irq_desc;
struct irq_data;
typedef	void (*irq_flow_handler_t)(unsigned int irq,
					    struct irq_desc *desc);
typedef	void (*irq_preflow_handler_t)(struct irq_data *data);

/*
 * IRQ line status.
 *
 * Bits 0-7 are the same as the IRQF_* bits in linux/interrupt.h
 *
 * IRQ_TYPE_NONE		- default, unspecified type
 * IRQ_TYPE_EDGE_RISING		- rising edge triggered
 * IRQ_TYPE_EDGE_FALLING	- falling edge triggered
 * IRQ_TYPE_EDGE_BOTH		- rising and falling edge triggered
 * IRQ_TYPE_LEVEL_HIGH		- high level triggered
 * IRQ_TYPE_LEVEL_LOW		- low level triggered
 * IRQ_TYPE_LEVEL_MASK		- Mask to filter out the level bits
 * IRQ_TYPE_SENSE_MASK		- Mask for all the above bits
 * IRQ_TYPE_PROBE		- Special flag for probing in progress
 *
 * Bits which can be modified via irq_set/clear/modify_status_flags()
 * IRQ_LEVEL			- Interrupt is level type. Will be also
 *				  updated in the code when the above trigger
 *				  bits are modified via set_irq_type()
 * IRQ_PER_CPU			- Mark an interrupt PER_CPU. Will protect
 *				  it from affinity setting
 * IRQ_NOPROBE			- Interrupt cannot be probed by autoprobing
 * IRQ_NOREQUEST		- Interrupt cannot be requested via
 *				  request_irq()
 * IRQ_NOAUTOEN			- Interrupt is not automatically enabled in
 *				  request/setup_irq()
 * IRQ_NO_BALANCING		- Interrupt cannot be balanced (affinity set)
 * IRQ_MOVE_PCNTXT		- Interrupt can be migrated from process context
 * IRQ_NESTED_TRHEAD		- Interrupt nests into another thread
 *
 * Deprecated bits. They are kept updated as long as
 * CONFIG_GENERIC_HARDIRQS_NO_COMPAT is not set. Will go away soon. These bits
 * are internal state of the core code and if you really need to acces
 * them then talk to the genirq maintainer instead of hacking
 * something weird.
 *
 */
enum {
	IRQ_TYPE_NONE		= 0x00000000,
	IRQ_TYPE_EDGE_RISING	= 0x00000001,
	IRQ_TYPE_EDGE_FALLING	= 0x00000002,
	IRQ_TYPE_EDGE_BOTH	= (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING),
	IRQ_TYPE_LEVEL_HIGH	= 0x00000004,
	IRQ_TYPE_LEVEL_LOW	= 0x00000008,
	IRQ_TYPE_LEVEL_MASK	= (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH),
	IRQ_TYPE_SENSE_MASK	= 0x0000000f,

	IRQ_TYPE_PROBE		= 0x00000010,

	IRQ_LEVEL		= (1 <<  8),
	IRQ_PER_CPU		= (1 <<  9),
	IRQ_NOPROBE		= (1 << 10),
	IRQ_NOREQUEST		= (1 << 11),
	IRQ_NOAUTOEN		= (1 << 12),
	IRQ_NO_BALANCING	= (1 << 13),
	IRQ_MOVE_PCNTXT		= (1 << 14),
	IRQ_NESTED_THREAD	= (1 << 15),

#ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
	IRQ_INPROGRESS		= (1 << 16),
	IRQ_REPLAY		= (1 << 17),
	IRQ_WAITING		= (1 << 18),
	IRQ_DISABLED		= (1 << 19),
	IRQ_PENDING		= (1 << 20),
	IRQ_MASKED		= (1 << 21),
	IRQ_MOVE_PENDING	= (1 << 22),
	IRQ_AFFINITY_SET	= (1 << 23),
	IRQ_WAKEUP		= (1 << 24),
#endif
};

#define IRQF_MODIFY_MASK	\
	(IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
	 IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
	 IRQ_PER_CPU | IRQ_NESTED_THREAD)

#define IRQ_NO_BALANCING_MASK	(IRQ_PER_CPU | IRQ_NO_BALANCING)

static inline __deprecated bool CHECK_IRQ_PER_CPU(unsigned int status)
{
	return status & IRQ_PER_CPU;
}

/*
 * Return value for chip->irq_set_affinity()
 *
 * IRQ_SET_MASK_OK	- OK, core updates irq_data.affinity
 * IRQ_SET_MASK_NOCPY	- OK, chip did update irq_data.affinity
 */
enum {
	IRQ_SET_MASK_OK = 0,
	IRQ_SET_MASK_OK_NOCOPY,
};

struct msi_desc;

/**
 * struct irq_data - per irq and irq chip data passed down to chip functions
 * @irq:		interrupt number
 * @node:		node index useful for balancing
 * @state_use_accessor: status information for irq chip functions.
 *			Use accessor functions to deal with it
 * @chip:		low level interrupt hardware access
 * @handler_data:	per-IRQ data for the irq_chip methods
 * @chip_data:		platform-specific per-chip private data for the chip
 *			methods, to allow shared chip implementations
 * @msi_desc:		MSI descriptor
 * @affinity:		IRQ affinity on SMP
 *
 * The fields here need to overlay the ones in irq_desc until we
 * cleaned up the direct references and switched everything over to
 * irq_data.
 */
struct irq_data {
	unsigned int		irq;
	unsigned int		node;
	unsigned int		state_use_accessors;
	struct irq_chip		*chip;
	void			*handler_data;
	void			*chip_data;
	struct msi_desc		*msi_desc;
#ifdef CONFIG_SMP
	cpumask_var_t		affinity;
#endif
};

/*
 * Bit masks for irq_data.state
 *
 * IRQD_TRIGGER_MASK		- Mask for the trigger type bits
 * IRQD_SETAFFINITY_PENDING	- Affinity setting is pending
 * IRQD_NO_BALANCING		- Balancing disabled for this IRQ
 * IRQD_PER_CPU			- Interrupt is per cpu
 * IRQD_AFFINITY_SET		- Interrupt affinity was set
 * IRQD_LEVEL			- Interrupt is level triggered
 * IRQD_WAKEUP_STATE		- Interrupt is configured for wakeup
 *				  from suspend
 * IRDQ_MOVE_PCNTXT		- Interrupt can be moved in process
 *				  context
 * IRQD_IRQ_DISABLED		- Some chip function need to know the
 *				  disabled state.
 */
enum {
	IRQD_TRIGGER_MASK		= 0xf,
	IRQD_SETAFFINITY_PENDING	= (1 <<  8),
	IRQD_NO_BALANCING		= (1 << 10),
	IRQD_PER_CPU			= (1 << 11),
	IRQD_AFFINITY_SET		= (1 << 12),
	IRQD_LEVEL			= (1 << 13),
	IRQD_WAKEUP_STATE		= (1 << 14),
	IRQD_MOVE_PCNTXT		= (1 << 15),
	IRQD_IRQ_DISABLED		= (1 << 16),
};

static inline bool irqd_is_setaffinity_pending(struct irq_data *d)
{
	return d->state_use_accessors & IRQD_SETAFFINITY_PENDING;
}

static inline bool irqd_is_per_cpu(struct irq_data *d)
{
	return d->state_use_accessors & IRQD_PER_CPU;
}

static inline bool irqd_can_balance(struct irq_data *d)
{
	return !(d->state_use_accessors & (IRQD_PER_CPU | IRQD_NO_BALANCING));
}

static inline bool irqd_affinity_was_set(struct irq_data *d)
{
	return d->state_use_accessors & IRQD_AFFINITY_SET;
}

static inline u32 irqd_get_trigger_type(struct irq_data *d)
{
	return d->state_use_accessors & IRQD_TRIGGER_MASK;
}

/*
 * Must only be called inside irq_chip.irq_set_type() functions.
 */
static inline void irqd_set_trigger_type(struct irq_data *d, u32 type)
{
	d->state_use_accessors &= ~IRQD_TRIGGER_MASK;
	d->state_use_accessors |= type & IRQD_TRIGGER_MASK;
}

static inline bool irqd_is_level_type(struct irq_data *d)
{
	return d->state_use_accessors & IRQD_LEVEL;
}

static inline bool irqd_is_wakeup_set(struct irq_data *d)
{
	return d->state_use_accessors & IRQD_WAKEUP_STATE;
}

static inline bool irqd_can_move_in_process_context(struct irq_data *d)
{
	return d->state_use_accessors & IRQD_MOVE_PCNTXT;
}

static inline bool irqd_irq_disabled(struct irq_data *d)
{
	return d->state_use_accessors & IRQD_IRQ_DISABLED;
}

/**
 * struct irq_chip - hardware interrupt chip descriptor
 *
 * @name:		name for /proc/interrupts
 * @startup:		deprecated, replaced by irq_startup
 * @shutdown:		deprecated, replaced by irq_shutdown
 * @enable:		deprecated, replaced by irq_enable
 * @disable:		deprecated, replaced by irq_disable
 * @ack:		deprecated, replaced by irq_ack
 * @mask:		deprecated, replaced by irq_mask
 * @mask_ack:		deprecated, replaced by irq_mask_ack
 * @unmask:		deprecated, replaced by irq_unmask
 * @eoi:		deprecated, replaced by irq_eoi
 * @end:		deprecated, will go away with __do_IRQ()
 * @set_affinity:	deprecated, replaced by irq_set_affinity
 * @retrigger:		deprecated, replaced by irq_retrigger
 * @set_type:		deprecated, replaced by irq_set_type
 * @set_wake:		deprecated, replaced by irq_wake
 * @bus_lock:		deprecated, replaced by irq_bus_lock
 * @bus_sync_unlock:	deprecated, replaced by irq_bus_sync_unlock
 *
 * @irq_startup:	start up the interrupt (defaults to ->enable if NULL)
 * @irq_shutdown:	shut down the interrupt (defaults to ->disable if NULL)
 * @irq_enable:		enable the interrupt (defaults to chip->unmask if NULL)
 * @irq_disable:	disable the interrupt
 * @irq_ack:		start of a new interrupt
 * @irq_mask:		mask an interrupt source
 * @irq_mask_ack:	ack and mask an interrupt source
 * @irq_unmask:		unmask an interrupt source
 * @irq_eoi:		end of interrupt
 * @irq_set_affinity:	set the CPU affinity on SMP machines
 * @irq_retrigger:	resend an IRQ to the CPU
 * @irq_set_type:	set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
 * @irq_set_wake:	enable/disable power-management wake-on of an IRQ
 * @irq_bus_lock:	function to lock access to slow bus (i2c) chips
 * @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips
 * @irq_cpu_online:	configure an interrupt source for a secondary CPU
 * @irq_cpu_offline:	un-configure an interrupt source for a secondary CPU
 * @irq_print_chip:	optional to print special chip info in show_interrupts
 * @flags:		chip specific flags
 *
 * @release:		release function solely used by UML
 */
struct irq_chip {
	const char	*name;
#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
	unsigned int	(*startup)(unsigned int irq);
	void		(*shutdown)(unsigned int irq);
	void		(*enable)(unsigned int irq);
	void		(*disable)(unsigned int irq);

	void		(*ack)(unsigned int irq);
	void		(*mask)(unsigned int irq);
	void		(*mask_ack)(unsigned int irq);
	void		(*unmask)(unsigned int irq);
	void		(*eoi)(unsigned int irq);

	void		(*end)(unsigned int irq);
	int		(*set_affinity)(unsigned int irq,
					const struct cpumask *dest);
	int		(*retrigger)(unsigned int irq);
	int		(*set_type)(unsigned int irq, unsigned int flow_type);
	int		(*set_wake)(unsigned int irq, unsigned int on);

	void		(*bus_lock)(unsigned int irq);
	void		(*bus_sync_unlock)(unsigned int irq);
#endif
	unsigned int	(*irq_startup)(struct irq_data *data);
	void		(*irq_shutdown)(struct irq_data *data);
	void		(*irq_enable)(struct irq_data *data);
	void		(*irq_disable)(struct irq_data *data);

	void		(*irq_ack)(struct irq_data *data);
	void		(*irq_mask)(struct irq_data *data);
	void		(*irq_mask_ack)(struct irq_data *data);
	void		(*irq_unmask)(struct irq_data *data);
	void		(*irq_eoi)(struct irq_data *data);

	int		(*irq_set_affinity)(struct irq_data *data, const struct cpumask *dest, bool force);
	int		(*irq_retrigger)(struct irq_data *data);
	int		(*irq_set_type)(struct irq_data *data, unsigned int flow_type);
	int		(*irq_set_wake)(struct irq_data *data, unsigned int on);

	void		(*irq_bus_lock)(struct irq_data *data);
	void		(*irq_bus_sync_unlock)(struct irq_data *data);

	void		(*irq_cpu_online)(struct irq_data *data);
	void		(*irq_cpu_offline)(struct irq_data *data);

	void		(*irq_print_chip)(struct irq_data *data, struct seq_file *p);

	unsigned long	flags;

	/* Currently used only by UML, might disappear one day.*/
#ifdef CONFIG_IRQ_RELEASE_METHOD
	void		(*release)(unsigned int irq, void *dev_id);
#endif
};

/*
 * irq_chip specific flags
 *
 * IRQCHIP_SET_TYPE_MASKED:	Mask before calling chip.irq_set_type()
 * IRQCHIP_EOI_IF_HANDLED:	Only issue irq_eoi() when irq was handled
 * IRQCHIP_MASK_ON_SUSPEND:	Mask non wake irqs in the suspend path
 */
enum {
	IRQCHIP_SET_TYPE_MASKED		= (1 <<  0),
	IRQCHIP_EOI_IF_HANDLED		= (1 <<  1),
	IRQCHIP_MASK_ON_SUSPEND		= (1 <<  2),
};

/* This include will go away once we isolated irq_desc usage to core code */
#include <linux/irqdesc.h>

/*
 * Pick up the arch-dependent methods:
 */
#include <asm/hw_irq.h>

#ifndef NR_IRQS_LEGACY
# define NR_IRQS_LEGACY 0
#endif

#ifndef ARCH_IRQ_INIT_FLAGS
# define ARCH_IRQ_INIT_FLAGS	0
#endif

#define IRQ_DEFAULT_INIT_FLAGS	ARCH_IRQ_INIT_FLAGS

struct irqaction;
extern int setup_irq(unsigned int irq, struct irqaction *new);
extern void remove_irq(unsigned int irq, struct irqaction *act);

extern void irq_cpu_online(void);
extern void irq_cpu_offline(void);

#ifdef CONFIG_GENERIC_HARDIRQS

#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
void move_native_irq(int irq);
void move_masked_irq(int irq);
void irq_move_irq(struct irq_data *data);
void irq_move_masked_irq(struct irq_data *data);
#else
static inline void move_native_irq(int irq) { }
static inline void move_masked_irq(int irq) { }
static inline void irq_move_irq(struct irq_data *data) { }
static inline void irq_move_masked_irq(struct irq_data *data) { }
#endif

extern int no_irq_affinity;

/* Handle irq action chains: */
extern irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action);

/*
 * Built-in IRQ handlers for various IRQ types,
 * callable via desc->handle_irq()
 */
extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_nested_irq(unsigned int irq);

/* Handling of unhandled and spurious interrupts: */
extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
			   irqreturn_t action_ret);


/* Enable/disable irq debugging output: */
extern int noirqdebug_setup(char *str);

/* Checks whether the interrupt can be requested by request_irq(): */
extern int can_request_irq(unsigned int irq, unsigned long irqflags);

/* Dummy irq-chip implementations: */
extern struct irq_chip no_irq_chip;
extern struct irq_chip dummy_irq_chip;

extern void
irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
			      irq_flow_handler_t handle, const char *name);

static inline void irq_set_chip_and_handler(unsigned int irq, struct irq_chip *chip,
					    irq_flow_handler_t handle)
{
	irq_set_chip_and_handler_name(irq, chip, handle, NULL);
}

extern void
__irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
		  const char *name);

static inline void
irq_set_handler(unsigned int irq, irq_flow_handler_t handle)
{
	__irq_set_handler(irq, handle, 0, NULL);
}

/*
 * Set a highlevel chained flow handler for a given IRQ.
 * (a chained handler is automatically enabled and set to
 *  IRQ_NOREQUEST and IRQ_NOPROBE)
 */
static inline void
irq_set_chained_handler(unsigned int irq, irq_flow_handler_t handle)
{
	__irq_set_handler(irq, handle, 1, NULL);
}

void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set);

static inline void irq_set_status_flags(unsigned int irq, unsigned long set)
{
	irq_modify_status(irq, 0, set);
}

static inline void irq_clear_status_flags(unsigned int irq, unsigned long clr)
{
	irq_modify_status(irq, clr, 0);
}

static inline void irq_set_noprobe(unsigned int irq)
{
	irq_modify_status(irq, 0, IRQ_NOPROBE);
}

static inline void irq_set_probe(unsigned int irq)
{
	irq_modify_status(irq, IRQ_NOPROBE, 0);
}

static inline void irq_set_nested_thread(unsigned int irq, bool nest)
{
	if (nest)
		irq_set_status_flags(irq, IRQ_NESTED_THREAD);
	else
		irq_clear_status_flags(irq, IRQ_NESTED_THREAD);
}

/* Handle dynamic irq creation and destruction */
extern unsigned int create_irq_nr(unsigned int irq_want, int node);
extern int create_irq(void);
extern void destroy_irq(unsigned int irq);

/*
 * Dynamic irq helper functions. Obsolete. Use irq_alloc_desc* and
 * irq_free_desc instead.
 */
extern void dynamic_irq_cleanup(unsigned int irq);
static inline void dynamic_irq_init(unsigned int irq)
{
	dynamic_irq_cleanup(irq);
}

/* Set/get chip/data for an IRQ: */
extern int irq_set_chip(unsigned int irq, struct irq_chip *chip);
extern int irq_set_handler_data(unsigned int irq, void *data);
extern int irq_set_chip_data(unsigned int irq, void *data);
extern int irq_set_irq_type(unsigned int irq, unsigned int type);
extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry);
extern struct irq_data *irq_get_irq_data(unsigned int irq);

static inline struct irq_chip *irq_get_chip(unsigned int irq)
{
	struct irq_data *d = irq_get_irq_data(irq);
	return d ? d->chip : NULL;
}

static inline struct irq_chip *irq_data_get_irq_chip(struct irq_data *d)
{
	return d->chip;
}

static inline void *irq_get_chip_data(unsigned int irq)
{
	struct irq_data *d = irq_get_irq_data(irq);
	return d ? d->chip_data : NULL;
}

static inline void *irq_data_get_irq_chip_data(struct irq_data *d)
{
	return d->chip_data;
}

static inline void *irq_get_handler_data(unsigned int irq)
{
	struct irq_data *d = irq_get_irq_data(irq);
	return d ? d->handler_data : NULL;
}

static inline void *irq_data_get_irq_handler_data(struct irq_data *d)
{
	return d->handler_data;
}

static inline struct msi_desc *irq_get_msi_desc(unsigned int irq)
{
	struct irq_data *d = irq_get_irq_data(irq);
	return d ? d->msi_desc : NULL;
}

static inline struct msi_desc *irq_data_get_msi(struct irq_data *d)
{
	return d->msi_desc;
}

#ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
/* Please do not use: Use the replacement functions instead */
static inline int set_irq_chip(unsigned int irq, struct irq_chip *chip)
{
	return irq_set_chip(irq, chip);
}
static inline int set_irq_data(unsigned int irq, void *data)
{
	return irq_set_handler_data(irq, data);
}
static inline int set_irq_chip_data(unsigned int irq, void *data)
{
	return irq_set_chip_data(irq, data);
}
static inline int set_irq_type(unsigned int irq, unsigned int type)
{
	return irq_set_irq_type(irq, type);
}
static inline int set_irq_msi(unsigned int irq, struct msi_desc *entry)
{
	return irq_set_msi_desc(irq, entry);
}
static inline struct irq_chip *get_irq_chip(unsigned int irq)
{
	return irq_get_chip(irq);
}
static inline void *get_irq_chip_data(unsigned int irq)
{
	return irq_get_chip_data(irq);
}
static inline void *get_irq_data(unsigned int irq)
{
	return irq_get_handler_data(irq);
}
static inline void *irq_data_get_irq_data(struct irq_data *d)
{
	return irq_data_get_irq_handler_data(d);
}
static inline struct msi_desc *get_irq_msi(unsigned int irq)
{
	return irq_get_msi_desc(irq);
}
static inline void set_irq_noprobe(unsigned int irq)
{
	irq_set_noprobe(irq);
}
static inline void set_irq_probe(unsigned int irq)
{
	irq_set_probe(irq);
}
static inline void set_irq_nested_thread(unsigned int irq, int nest)
{
	irq_set_nested_thread(irq, nest);
}
static inline void
set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
			      irq_flow_handler_t handle, const char *name)
{
	irq_set_chip_and_handler_name(irq, chip, handle, name);
}
static inline void
set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
			 irq_flow_handler_t handle)
{
	irq_set_chip_and_handler(irq, chip, handle);
}
static inline void
__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
		  const char *name)
{
	__irq_set_handler(irq, handle, is_chained, name);
}
static inline void set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
{
	irq_set_handler(irq, handle);
}
static inline void
set_irq_chained_handler(unsigned int irq, irq_flow_handler_t handle)
{
	irq_set_chained_handler(irq, handle);
}
#endif

int irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node);
void irq_free_descs(unsigned int irq, unsigned int cnt);
int irq_reserve_irqs(unsigned int from, unsigned int cnt);

static inline int irq_alloc_desc(int node)
{
	return irq_alloc_descs(-1, 0, 1, node);
}

static inline int irq_alloc_desc_at(unsigned int at, int node)
{
	return irq_alloc_descs(at, at, 1, node);
}

static inline int irq_alloc_desc_from(unsigned int from, int node)
{
	return irq_alloc_descs(-1, from, 1, node);
}

static inline void irq_free_desc(unsigned int irq)
{
	irq_free_descs(irq, 1);
}

static inline int irq_reserve_irq(unsigned int irq)
{
	return irq_reserve_irqs(irq, 1);
}

#endif /* CONFIG_GENERIC_HARDIRQS */

#endif /* !CONFIG_S390 */

#endif /* _LINUX_IRQ_H */