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Linux kernel mirror (for testing)
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linux
1#ifndef _LINUX_IRQDESC_H
2#define _LINUX_IRQDESC_H
3
4/*
5 * Core internal functions to deal with irq descriptors
6 *
7 * This include will move to kernel/irq once we cleaned up the tree.
8 * For now it's included from <linux/irq.h>
9 */
10
11struct irq_affinity_notify;
12struct proc_dir_entry;
13struct timer_rand_state;
14/**
15 * struct irq_desc - interrupt descriptor
16 * @irq_data: per irq and chip data passed down to chip functions
17 * @timer_rand_state: pointer to timer rand state struct
18 * @kstat_irqs: irq stats per cpu
19 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
20 * @action: the irq action chain
21 * @status: status information
22 * @core_internal_state__do_not_mess_with_it: core internal status information
23 * @depth: disable-depth, for nested irq_disable() calls
24 * @wake_depth: enable depth, for multiple set_irq_wake() callers
25 * @irq_count: stats field to detect stalled irqs
26 * @last_unhandled: aging timer for unhandled count
27 * @irqs_unhandled: stats field for spurious unhandled interrupts
28 * @lock: locking for SMP
29 * @affinity_notify: context for notification of affinity changes
30 * @pending_mask: pending rebalanced interrupts
31 * @threads_oneshot: bitfield to handle shared oneshot threads
32 * @threads_active: number of irqaction threads currently running
33 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
34 * @dir: /proc/irq/ procfs entry
35 * @name: flow handler name for /proc/interrupts output
36 */
37struct irq_desc {
38 struct irq_data irq_data;
39 struct timer_rand_state *timer_rand_state;
40 unsigned int __percpu *kstat_irqs;
41 irq_flow_handler_t handle_irq;
42#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
43 irq_preflow_handler_t preflow_handler;
44#endif
45 struct irqaction *action; /* IRQ action list */
46 unsigned int status_use_accessors;
47 unsigned int core_internal_state__do_not_mess_with_it;
48 unsigned int depth; /* nested irq disables */
49 unsigned int wake_depth; /* nested wake enables */
50 unsigned int irq_count; /* For detecting broken IRQs */
51 unsigned long last_unhandled; /* Aging timer for unhandled count */
52 unsigned int irqs_unhandled;
53 raw_spinlock_t lock;
54#ifdef CONFIG_SMP
55 const struct cpumask *affinity_hint;
56 struct irq_affinity_notify *affinity_notify;
57#ifdef CONFIG_GENERIC_PENDING_IRQ
58 cpumask_var_t pending_mask;
59#endif
60#endif
61 unsigned long threads_oneshot;
62 atomic_t threads_active;
63 wait_queue_head_t wait_for_threads;
64#ifdef CONFIG_PROC_FS
65 struct proc_dir_entry *dir;
66#endif
67 const char *name;
68} ____cacheline_internodealigned_in_smp;
69
70#ifndef CONFIG_SPARSE_IRQ
71extern struct irq_desc irq_desc[NR_IRQS];
72#endif
73
74#ifdef CONFIG_GENERIC_HARDIRQS
75
76static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
77{
78 return &desc->irq_data;
79}
80
81static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
82{
83 return desc->irq_data.chip;
84}
85
86static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
87{
88 return desc->irq_data.chip_data;
89}
90
91static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
92{
93 return desc->irq_data.handler_data;
94}
95
96static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
97{
98 return desc->irq_data.msi_desc;
99}
100
101/*
102 * Architectures call this to let the generic IRQ layer
103 * handle an interrupt. If the descriptor is attached to an
104 * irqchip-style controller then we call the ->handle_irq() handler,
105 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
106 */
107static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
108{
109 desc->handle_irq(irq, desc);
110}
111
112static inline void generic_handle_irq(unsigned int irq)
113{
114 generic_handle_irq_desc(irq, irq_to_desc(irq));
115}
116
117/* Test to see if a driver has successfully requested an irq */
118static inline int irq_has_action(unsigned int irq)
119{
120 struct irq_desc *desc = irq_to_desc(irq);
121 return desc->action != NULL;
122}
123
124/* caller has locked the irq_desc and both params are valid */
125static inline void __irq_set_handler_locked(unsigned int irq,
126 irq_flow_handler_t handler)
127{
128 struct irq_desc *desc;
129
130 desc = irq_to_desc(irq);
131 desc->handle_irq = handler;
132}
133
134/* caller has locked the irq_desc and both params are valid */
135static inline void
136__irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
137 irq_flow_handler_t handler, const char *name)
138{
139 struct irq_desc *desc;
140
141 desc = irq_to_desc(irq);
142 irq_desc_get_irq_data(desc)->chip = chip;
143 desc->handle_irq = handler;
144 desc->name = name;
145}
146
147static inline int irq_balancing_disabled(unsigned int irq)
148{
149 struct irq_desc *desc;
150
151 desc = irq_to_desc(irq);
152 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
153}
154
155static inline void
156irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
157{
158 struct irq_desc *desc = irq_to_desc(irq);
159
160 if (desc)
161 lockdep_set_class(&desc->lock, class);
162}
163
164#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
165static inline void
166__irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
167{
168 struct irq_desc *desc;
169
170 desc = irq_to_desc(irq);
171 desc->preflow_handler = handler;
172}
173#endif
174#endif
175
176#endif