1 #ifndef _LINUX_IRQDESC_H
2 #define _LINUX_IRQDESC_H
5 * Core internal functions to deal with irq descriptors
7 * This include will move to kernel/irq once we cleaned up the tree.
8 * For now it's included from <linux/irq.h>
11 struct irq_affinity_notify
;
12 struct proc_dir_entry
;
13 struct timer_rand_state
;
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
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
;
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
;
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
;
61 unsigned long threads_oneshot
;
62 atomic_t threads_active
;
63 wait_queue_head_t wait_for_threads
;
65 struct proc_dir_entry
*dir
;
68 } ____cacheline_internodealigned_in_smp
;
70 #ifndef CONFIG_SPARSE_IRQ
71 extern struct irq_desc irq_desc
[NR_IRQS
];
74 #ifdef CONFIG_GENERIC_HARDIRQS
76 static inline struct irq_data
*irq_desc_get_irq_data(struct irq_desc
*desc
)
78 return &desc
->irq_data
;
81 static inline struct irq_chip
*irq_desc_get_chip(struct irq_desc
*desc
)
83 return desc
->irq_data
.chip
;
86 static inline void *irq_desc_get_chip_data(struct irq_desc
*desc
)
88 return desc
->irq_data
.chip_data
;
91 static inline void *irq_desc_get_handler_data(struct irq_desc
*desc
)
93 return desc
->irq_data
.handler_data
;
96 static inline struct msi_desc
*irq_desc_get_msi_desc(struct irq_desc
*desc
)
98 return desc
->irq_data
.msi_desc
;
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.
107 static inline void generic_handle_irq_desc(unsigned int irq
, struct irq_desc
*desc
)
109 desc
->handle_irq(irq
, desc
);
112 static inline void generic_handle_irq(unsigned int irq
)
114 generic_handle_irq_desc(irq
, irq_to_desc(irq
));
117 /* Test to see if a driver has successfully requested an irq */
118 static inline int irq_has_action(unsigned int irq
)
120 struct irq_desc
*desc
= irq_to_desc(irq
);
121 return desc
->action
!= NULL
;
124 /* caller has locked the irq_desc and both params are valid */
125 static inline void __irq_set_handler_locked(unsigned int irq
,
126 irq_flow_handler_t handler
)
128 struct irq_desc
*desc
;
130 desc
= irq_to_desc(irq
);
131 desc
->handle_irq
= handler
;
134 /* caller has locked the irq_desc and both params are valid */
136 __irq_set_chip_handler_name_locked(unsigned int irq
, struct irq_chip
*chip
,
137 irq_flow_handler_t handler
, const char *name
)
139 struct irq_desc
*desc
;
141 desc
= irq_to_desc(irq
);
142 irq_desc_get_irq_data(desc
)->chip
= chip
;
143 desc
->handle_irq
= handler
;
147 static inline int irq_balancing_disabled(unsigned int irq
)
149 struct irq_desc
*desc
;
151 desc
= irq_to_desc(irq
);
152 return desc
->status_use_accessors
& IRQ_NO_BALANCING_MASK
;
156 irq_set_lockdep_class(unsigned int irq
, struct lock_class_key
*class)
158 struct irq_desc
*desc
= irq_to_desc(irq
);
161 lockdep_set_class(&desc
->lock
, class);
164 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
166 __irq_set_preflow_handler(unsigned int irq
, irq_preflow_handler_t handler
)
168 struct irq_desc
*desc
;
170 desc
= irq_to_desc(irq
);
171 desc
->preflow_handler
= handler
;