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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 module;
14/**
15 * struct irq_desc - interrupt descriptor
16 * @irq_data: per irq and chip data passed down to chip functions
17 * @kstat_irqs: irq stats per cpu
18 * @handle_irq: highlevel irq-events handler
19 * @preflow_handler: handler called before the flow handler (currently used by sparc)
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 irq_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_hint: hint to user space for preferred irq affinity
30 * @affinity_notify: context for notification of affinity changes
31 * @pending_mask: pending rebalanced interrupts
32 * @threads_oneshot: bitfield to handle shared oneshot threads
33 * @threads_active: number of irqaction threads currently running
34 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
35 * @dir: /proc/irq/ procfs entry
36 * @name: flow handler name for /proc/interrupts output
37 */
38struct irq_desc {
39 struct irq_data irq_data;
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 struct cpumask *percpu_enabled;
55#ifdef CONFIG_SMP
56 const struct cpumask *affinity_hint;
57 struct irq_affinity_notify *affinity_notify;
58#ifdef CONFIG_GENERIC_PENDING_IRQ
59 cpumask_var_t pending_mask;
60#endif
61#endif
62 unsigned long threads_oneshot;
63 atomic_t threads_active;
64 wait_queue_head_t wait_for_threads;
65#ifdef CONFIG_PROC_FS
66 struct proc_dir_entry *dir;
67#endif
68 struct module *owner;
69 const char *name;
70} ____cacheline_internodealigned_in_smp;
71
72#ifndef CONFIG_SPARSE_IRQ
73extern struct irq_desc irq_desc[NR_IRQS];
74#endif
75
76#ifdef CONFIG_GENERIC_HARDIRQS
77
78static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
79{
80 return &desc->irq_data;
81}
82
83static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
84{
85 return desc->irq_data.chip;
86}
87
88static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
89{
90 return desc->irq_data.chip_data;
91}
92
93static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
94{
95 return desc->irq_data.handler_data;
96}
97
98static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
99{
100 return desc->irq_data.msi_desc;
101}
102
103/*
104 * Architectures call this to let the generic IRQ layer
105 * handle an interrupt. If the descriptor is attached to an
106 * irqchip-style controller then we call the ->handle_irq() handler,
107 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
108 */
109static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
110{
111 desc->handle_irq(irq, desc);
112}
113
114int generic_handle_irq(unsigned int irq);
115
116/* Test to see if a driver has successfully requested an irq */
117static inline int irq_has_action(unsigned int irq)
118{
119 struct irq_desc *desc = irq_to_desc(irq);
120 return desc->action != NULL;
121}
122
123/* caller has locked the irq_desc and both params are valid */
124static inline void __irq_set_handler_locked(unsigned int irq,
125 irq_flow_handler_t handler)
126{
127 struct irq_desc *desc;
128
129 desc = irq_to_desc(irq);
130 desc->handle_irq = handler;
131}
132
133/* caller has locked the irq_desc and both params are valid */
134static inline void
135__irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
136 irq_flow_handler_t handler, const char *name)
137{
138 struct irq_desc *desc;
139
140 desc = irq_to_desc(irq);
141 irq_desc_get_irq_data(desc)->chip = chip;
142 desc->handle_irq = handler;
143 desc->name = name;
144}
145
146static inline int irq_balancing_disabled(unsigned int irq)
147{
148 struct irq_desc *desc;
149
150 desc = irq_to_desc(irq);
151 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
152}
153
154static inline void
155irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
156{
157 struct irq_desc *desc = irq_to_desc(irq);
158
159 if (desc)
160 lockdep_set_class(&desc->lock, class);
161}
162
163#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
164static inline void
165__irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
166{
167 struct irq_desc *desc;
168
169 desc = irq_to_desc(irq);
170 desc->preflow_handler = handler;
171}
172#endif
173#endif
174
175#endif