aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/irq.h
blob: 1e50c34f0062854ef167130ad349f1385adcb4d2 (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
#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 irq_desc;
typedef	void (*irq_flow_handler_t)(unsigned int irq,
					    struct irq_desc *desc);


/*
 * IRQ line status.
 *
 * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
 *
 * IRQ types
 */
#define IRQ_TYPE_NONE		0x00000000	/* Default, unspecified type */
#define IRQ_TYPE_EDGE_RISING	0x00000001	/* Edge rising type */
#define IRQ_TYPE_EDGE_FALLING	0x00000002	/* Edge falling type */
#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
#define IRQ_TYPE_LEVEL_HIGH	0x00000004	/* Level high type */
#define IRQ_TYPE_LEVEL_LOW	0x00000008	/* Level low type */
#define IRQ_TYPE_SENSE_MASK	0x0000000f	/* Mask of the above */
#define IRQ_TYPE_PROBE		0x00000010	/* Probing in progress */

/* Internal flags */
#define IRQ_INPROGRESS		0x00000100	/* IRQ handler active - do not enter! */
#define IRQ_DISABLED		0x00000200	/* IRQ disabled - do not enter! */
#define IRQ_PENDING		0x00000400	/* IRQ pending - replay on enable */
#define IRQ_REPLAY		0x00000800	/* IRQ has been replayed but not acked yet */
#define IRQ_AUTODETECT		0x00001000	/* IRQ is being autodetected */
#define IRQ_WAITING		0x00002000	/* IRQ not yet seen - for autodetection */
#define IRQ_LEVEL		0x00004000	/* IRQ level triggered */
#define IRQ_MASKED		0x00008000	/* IRQ masked - shouldn't be seen again */
#define IRQ_PER_CPU		0x00010000	/* IRQ is per CPU */
#define IRQ_NOPROBE		0x00020000	/* IRQ is not valid for probing */
#define IRQ_NOREQUEST		0x00040000	/* IRQ cannot be requested */
#define IRQ_NOAUTOEN		0x00080000	/* IRQ will not be enabled on request irq */
#define IRQ_WAKEUP		0x00100000	/* IRQ triggers system wakeup */
#define IRQ_MOVE_PENDING	0x00200000	/* need to re-target IRQ destination */
#define IRQ_NO_BALANCING	0x00400000	/* IRQ is excluded from balancing */
#define IRQ_SPURIOUS_DISABLED	0x00800000	/* IRQ was disabled by the spurious trap */
#define IRQ_MOVE_PCNTXT		0x01000000	/* IRQ migration from process context */
#define IRQ_AFFINITY_SET	0x02000000	/* IRQ affinity was set from userspace*/
#define IRQ_SUSPENDED		0x04000000	/* IRQ has gone through suspend sequence */

#ifdef CONFIG_IRQ_PER_CPU
# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
# define IRQ_NO_BALANCING_MASK	(IRQ_PER_CPU | IRQ_NO_BALANCING)
#else
# define CHECK_IRQ_PER_CPU(var) 0
# define IRQ_NO_BALANCING_MASK	IRQ_NO_BALANCING
#endif

struct proc_dir_entry;
struct msi_desc;

/**
 * struct irq_chip - hardware interrupt chip descriptor
 *
 * @name:		name for /proc/interrupts
 * @startup:		start up the interrupt (defaults to ->enable if NULL)
 * @shutdown:		shut down the interrupt (defaults to ->disable if NULL)
 * @enable:		enable the interrupt (defaults to chip->unmask if NULL)
 * @disable:		disable the interrupt (defaults to chip->mask if NULL)
 * @ack:		start of a new interrupt
 * @mask:		mask an interrupt source
 * @mask_ack:		ack and mask an interrupt source
 * @unmask:		unmask an interrupt source
 * @eoi:		end of interrupt - chip level
 * @end:		end of interrupt - flow level
 * @set_affinity:	set the CPU affinity on SMP machines
 * @retrigger:		resend an IRQ to the CPU
 * @set_type:		set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
 * @set_wake:		enable/disable power-management wake-on of an IRQ
 *
 * @release:		release function solely used by UML
 * @typename:		obsoleted by name, kept as migration helper
 */
struct irq_chip {
	const char	*name;
	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);

	/* Currently used only by UML, might disappear one day.*/
#ifdef CONFIG_IRQ_RELEASE_METHOD
	void		(*release)(unsigned int irq, void *dev_id);
#endif
	/*
	 * For compatibility, ->typename is copied into ->name.
	 * Will disappear.
	 */
	const char	*typename;
};

struct timer_rand_state;
struct irq_2_iommu;
/**
 * struct irq_desc - interrupt descriptor
 * @irq:		interrupt number for this descriptor
 * @timer_rand_state:	pointer to timer rand state struct
 * @kstat_irqs:		irq stats per cpu
 * @irq_2_iommu:	iommu with this irq
 * @handle_irq:		highlevel irq-events handler [if NULL, __do_IRQ()]
 * @chip:		low level interrupt hardware access
 * @msi_desc:		MSI descriptor
 * @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
 * @action:		the irq action chain
 * @status:		status information
 * @depth:		disable-depth, for nested irq_disable() calls
 * @wake_depth:		enable depth, for multiple set_irq_wake() callers
 * @irq_count:		stats field to detect stalled irqs
 * @last_unhandled:	aging timer for unhandled count
 * @irqs_unhandled:	stats field for spurious unhandled interrupts
 * @lock:		locking for SMP
 * @affinity:		IRQ affinity on SMP
 * @cpu:		cpu index useful for balancing
 * @pending_mask:	pending rebalanced interrupts
 * @threads_active:	number of irqaction threads currently running
 * @wait_for_threads:	wait queue for sync_irq to wait for threaded handlers
 * @dir:		/proc/irq/ procfs entry
 * @name:		flow handler name for /proc/interrupts output
 */
struct irq_desc {
	unsigned int		irq;
	struct timer_rand_state *timer_rand_state;
	unsigned int            *kstat_irqs;
#ifdef CONFIG_INTR_REMAP
	struct irq_2_iommu      *irq_2_iommu;
#endif
	irq_flow_handler_t	handle_irq;
	struct irq_chip		*chip;
	struct msi_desc		*msi_desc;
	void			*handler_data;
	void			*chip_data;
	struct irqaction	*action;	/* IRQ action list */
	unsigned int		status;		/* IRQ status */

	unsigned int		depth;		/* nested irq disables */
	unsigned int		wake_depth;	/* nested wake enables */
	unsigned int		irq_count;	/* For detecting broken IRQs */
	unsigned long		last_unhandled;	/* Aging timer for unhandled count */
	unsigned int		irqs_unhandled;
	spinlock_t		lock;
#ifdef CONFIG_SMP
	cpumask_var_t		affinity;
	unsigned int		node;
#ifdef CONFIG_GENERIC_PENDING_IRQ
	cpumask_var_t		pending_mask;
#endif
#endif
	atomic_t		threads_active;
	wait_queue_head_t       wait_for_threads;
#ifdef CONFIG_PROC_FS
	struct proc_dir_entry	*dir;
#endif
	const char		*name;
} ____cacheline_internodealigned_in_smp;

extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
					struct irq_desc *desc, int node);
extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);

#ifndef CONFIG_SPARSE_IRQ
extern struct irq_desc irq_desc[NR_IRQS];
#endif

#ifdef CONFIG_NUMA_IRQ_DESC
extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node);
#else
static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
{
	return desc;
}
#endif

extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);

/*
 * Migration helpers for obsolete names, they will go away:
 */
#define hw_interrupt_type	irq_chip
#define no_irq_type		no_irq_chip
typedef struct irq_desc		irq_desc_t;

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

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

#ifdef CONFIG_GENERIC_HARDIRQS

#ifdef CONFIG_SMP

#ifdef CONFIG_GENERIC_PENDING_IRQ

void move_native_irq(int irq);
void move_masked_irq(int irq);

#else /* CONFIG_GENERIC_PENDING_IRQ */

static inline void move_irq(int irq)
{
}

static inline void move_native_irq(int irq)
{
}

static inline void move_masked_irq(int irq)
{
}

#endif /* CONFIG_GENERIC_PENDING_IRQ */

#else /* CONFIG_SMP */

#define move_native_irq(x)
#define move_masked_irq(x)

#endif /* CONFIG_SMP */

extern int no_irq_affinity;

static inline int irq_balancing_disabled(unsigned int irq)
{
	struct irq_desc *desc;

	desc = irq_to_desc(irq);
	return desc->status & IRQ_NO_BALANCING_MASK;
}

/* 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->chip->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);

/*
 * Monolithic do_IRQ implementation.
 */
#ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
extern unsigned int __do_IRQ(unsigned int irq);
#endif

/*
 * Architectures call this to let the generic IRQ layer
 * handle an interrupt. If the descriptor is attached to an
 * irqchip-style controller then we call the ->handle_irq() handler,
 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 */
static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
{
#ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
	desc->handle_irq(irq, desc);
#else
	if (likely(desc->handle_irq))
		desc->handle_irq(irq, desc);
	else
		__do_IRQ(irq);
#endif
}

static inline void generic_handle_irq(unsigned int irq)
{
	generic_handle_irq_desc(irq, irq_to_desc(irq));
}

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

/* Resending of interrupts :*/
void check_irq_resend(struct irq_desc *desc, unsigned int irq);

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

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

/* caller has locked the irq_desc and both params are valid */
static inline void __set_irq_handler_unlocked(int irq,
					      irq_flow_handler_t handler)
{
	struct irq_desc *desc;

	desc = irq_to_desc(irq);
	desc->handle_irq = handler;
}

/*
 * Set a highlevel flow handler for a given IRQ:
 */
static inline void
set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
{
	__set_irq_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
set_irq_chained_handler(unsigned int irq,
			irq_flow_handler_t handle)
{
	__set_irq_handler(irq, handle, 1, NULL);
}

extern void set_irq_noprobe(unsigned int irq);
extern void set_irq_probe(unsigned int irq);

/* 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);

/* Test to see if a driver has successfully requested an irq */
static inline int irq_has_action(unsigned int irq)
{
	struct irq_desc *desc = irq_to_desc(irq);
	return desc->action != NULL;
}

/* Dynamic irq helper functions */
extern void dynamic_irq_init(unsigned int irq);
extern void dynamic_irq_cleanup(unsigned int irq);

/* Set/get chip/data for an IRQ: */
extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
extern int set_irq_data(unsigned int irq, void *data);
extern int set_irq_chip_data(unsigned int irq, void *data);
extern int set_irq_type(unsigned int irq, unsigned int type);
extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);

#define get_irq_chip(irq)	(irq_to_desc(irq)->chip)
#define get_irq_chip_data(irq)	(irq_to_desc(irq)->chip_data)
#define get_irq_data(irq)	(irq_to_desc(irq)->handler_data)
#define get_irq_msi(irq)	(irq_to_desc(irq)->msi_desc)

#define get_irq_desc_chip(desc)		((desc)->chip)
#define get_irq_desc_chip_data(desc)	((desc)->chip_data)
#define get_irq_desc_data(desc)		((desc)->handler_data)
#define get_irq_desc_msi(desc)		((desc)->msi_desc)

#endif /* CONFIG_GENERIC_HARDIRQS */

#endif /* !CONFIG_S390 */

#ifdef CONFIG_SMP
/**
 * alloc_desc_masks - allocate cpumasks for irq_desc
 * @desc:	pointer to irq_desc struct
 * @cpu:	cpu which will be handling the cpumasks
 * @boot:	true if need bootmem
 *
 * Allocates affinity and pending_mask cpumask if required.
 * Returns true if successful (or not required).
 */
static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
							bool boot)
{
	gfp_t gfp = GFP_ATOMIC;

	if (boot)
		gfp = GFP_NOWAIT;

#ifdef CONFIG_CPUMASK_OFFSTACK
	if (!alloc_cpumask_var_node(&desc->affinity, gfp, node))
		return false;

#ifdef CONFIG_GENERIC_PENDING_IRQ
	if (!alloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
		free_cpumask_var(desc->affinity);
		return false;
	}
#endif
#endif
	return true;
}

static inline void init_desc_masks(struct irq_desc *desc)
{
	cpumask_setall(desc->affinity);
#ifdef CONFIG_GENERIC_PENDING_IRQ
	cpumask_clear(desc->pending_mask);
#endif
}

/**
 * init_copy_desc_masks - copy cpumasks for irq_desc
 * @old_desc:	pointer to old irq_desc struct
 * @new_desc:	pointer to new irq_desc struct
 *
 * Insures affinity and pending_masks are copied to new irq_desc.
 * If !CONFIG_CPUMASKS_OFFSTACK the cpumasks are embedded in the
 * irq_desc struct so the copy is redundant.
 */

static inline void init_copy_desc_masks(struct irq_desc *old_desc,
					struct irq_desc *new_desc)
{
#ifdef CONFIG_CPUMASK_OFFSTACK
	cpumask_copy(new_desc->affinity, old_desc->affinity);

#ifdef CONFIG_GENERIC_PENDING_IRQ
	cpumask_copy(new_desc->pending_mask, old_desc->pending_mask);
#endif
#endif
}

static inline void free_desc_masks(struct irq_desc *old_desc,
				   struct irq_desc *new_desc)
{
	free_cpumask_var(old_desc->affinity);

#ifdef CONFIG_GENERIC_PENDING_IRQ
	free_cpumask_var(old_desc->pending_mask);
#endif
}

#else /* !CONFIG_SMP */

static inline bool alloc_desc_masks(struct irq_desc *desc, int node,
								bool boot)
{
	return true;
}

static inline void init_desc_masks(struct irq_desc *desc)
{
}

static inline void init_copy_desc_masks(struct irq_desc *old_desc,
					struct irq_desc *new_desc)
{
}

static inline void free_desc_masks(struct irq_desc *old_desc,
				   struct irq_desc *new_desc)
{
}
#endif	/* CONFIG_SMP */

#endif /* _LINUX_IRQ_H */

Privacy Policy