aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/irqdesc.h
blob: c1a95b7b58de736f228cfeef9bfe1f118e02bf29 (plain) (blame)
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
#ifndef _LINUX_IRQDESC_H
#define _LINUX_IRQDESC_H

/*
 * Core internal functions to deal with irq descriptors
 *
 * This include will move to kernel/irq once we cleaned up the tree.
 * For now it's included from <linux/irq.h>
 */

struct proc_dir_entry;
struct timer_rand_state;
/**
 * struct irq_desc - interrupt descriptor
 * @irq_data:		per irq and chip data passed down to chip functions
 * @timer_rand_state:	pointer to timer rand state struct
 * @kstat_irqs:		irq stats per cpu
 * @handle_irq:		highlevel irq-events handler [if NULL, __do_IRQ()]
 * @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
 * @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 {

#ifdef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
	struct irq_data		irq_data;
#else
	/*
	 * This union will go away, once we fixed the direct access to
	 * irq_desc all over the place. The direct fields are a 1:1
	 * overlay of irq_data.
	 */
	union {
		struct irq_data		irq_data;
		struct {
			unsigned int		irq;
			unsigned int		node;
			struct irq_chip		*chip;
			void			*handler_data;
			void			*chip_data;
			struct msi_desc		*msi_desc;
#ifdef CONFIG_SMP
			cpumask_var_t		affinity;
#endif
		};
	};
#endif

	struct timer_rand_state *timer_rand_state;
	unsigned int __percpu	*kstat_irqs;
	irq_flow_handler_t	handle_irq;
	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;
	raw_spinlock_t		lock;
#ifdef CONFIG_SMP
	const struct cpumask	*affinity_hint;
#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;

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

/* Will be removed once the last users in power and sh are gone */
extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
{
	return desc;
}

#ifdef CONFIG_GENERIC_HARDIRQS

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

/*
 * 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)
{
	desc->handle_irq(irq, desc);
}

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

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;
}

/* 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;
}
#endif

#endif