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
;
17 * struct irq_desc - interrupt descriptor
18 * @irq_data: per irq and chip data passed down to chip functions
19 * @kstat_irqs: irq stats per cpu
20 * @handle_irq: highlevel irq-events handler
21 * @preflow_handler: handler called before the flow handler (currently used by sparc)
22 * @action: the irq action chain
23 * @status: status information
24 * @core_internal_state__do_not_mess_with_it: core internal status information
25 * @depth: disable-depth, for nested irq_disable() calls
26 * @wake_depth: enable depth, for multiple irq_set_irq_wake() callers
27 * @irq_count: stats field to detect stalled irqs
28 * @last_unhandled: aging timer for unhandled count
29 * @irqs_unhandled: stats field for spurious unhandled interrupts
30 * @threads_handled: stats field for deferred spurious detection of threaded handlers
31 * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers
32 * @lock: locking for SMP
33 * @affinity_hint: hint to user space for preferred irq affinity
34 * @affinity_notify: context for notification of affinity changes
35 * @pending_mask: pending rebalanced interrupts
36 * @threads_oneshot: bitfield to handle shared oneshot threads
37 * @threads_active: number of irqaction threads currently running
38 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
39 * @dir: /proc/irq/ procfs entry
40 * @name: flow handler name for /proc/interrupts output
43 struct irq_data irq_data
;
44 unsigned int __percpu
*kstat_irqs
;
45 irq_flow_handler_t handle_irq
;
46 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
47 irq_preflow_handler_t preflow_handler
;
49 struct irqaction
*action
; /* IRQ action list */
50 unsigned int status_use_accessors
;
51 unsigned int core_internal_state__do_not_mess_with_it
;
52 unsigned int depth
; /* nested irq disables */
53 unsigned int wake_depth
; /* nested wake enables */
54 unsigned int irq_count
; /* For detecting broken IRQs */
55 unsigned long last_unhandled
; /* Aging timer for unhandled count */
56 unsigned int irqs_unhandled
;
57 atomic_t threads_handled
;
58 int threads_handled_last
;
60 struct cpumask
*percpu_enabled
;
62 const struct cpumask
*affinity_hint
;
63 struct irq_affinity_notify
*affinity_notify
;
64 #ifdef CONFIG_GENERIC_PENDING_IRQ
65 cpumask_var_t pending_mask
;
68 unsigned long threads_oneshot
;
69 atomic_t threads_active
;
70 wait_queue_head_t wait_for_threads
;
72 struct proc_dir_entry
*dir
;
77 } ____cacheline_internodealigned_in_smp
;
79 #ifndef CONFIG_SPARSE_IRQ
80 extern struct irq_desc irq_desc
[NR_IRQS
];
83 static inline struct irq_data
*irq_desc_get_irq_data(struct irq_desc
*desc
)
85 return &desc
->irq_data
;
88 static inline struct irq_chip
*irq_desc_get_chip(struct irq_desc
*desc
)
90 return desc
->irq_data
.chip
;
93 static inline void *irq_desc_get_chip_data(struct irq_desc
*desc
)
95 return desc
->irq_data
.chip_data
;
98 static inline void *irq_desc_get_handler_data(struct irq_desc
*desc
)
100 return desc
->irq_data
.handler_data
;
103 static inline struct msi_desc
*irq_desc_get_msi_desc(struct irq_desc
*desc
)
105 return desc
->irq_data
.msi_desc
;
109 * Architectures call this to let the generic IRQ layer
110 * handle an interrupt. If the descriptor is attached to an
111 * irqchip-style controller then we call the ->handle_irq() handler,
112 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
114 static inline void generic_handle_irq_desc(unsigned int irq
, struct irq_desc
*desc
)
116 desc
->handle_irq(irq
, desc
);
119 int generic_handle_irq(unsigned int irq
);
121 /* Test to see if a driver has successfully requested an irq */
122 static inline int irq_has_action(unsigned int irq
)
124 struct irq_desc
*desc
= irq_to_desc(irq
);
125 return desc
->action
!= NULL
;
128 /* caller has locked the irq_desc and both params are valid */
129 static inline void __irq_set_handler_locked(unsigned int irq
,
130 irq_flow_handler_t handler
)
132 struct irq_desc
*desc
;
134 desc
= irq_to_desc(irq
);
135 desc
->handle_irq
= handler
;
138 /* caller has locked the irq_desc and both params are valid */
140 __irq_set_chip_handler_name_locked(unsigned int irq
, struct irq_chip
*chip
,
141 irq_flow_handler_t handler
, const char *name
)
143 struct irq_desc
*desc
;
145 desc
= irq_to_desc(irq
);
146 irq_desc_get_irq_data(desc
)->chip
= chip
;
147 desc
->handle_irq
= handler
;
151 static inline int irq_balancing_disabled(unsigned int irq
)
153 struct irq_desc
*desc
;
155 desc
= irq_to_desc(irq
);
156 return desc
->status_use_accessors
& IRQ_NO_BALANCING_MASK
;
159 static inline int irq_is_percpu(unsigned int irq
)
161 struct irq_desc
*desc
;
163 desc
= irq_to_desc(irq
);
164 return desc
->status_use_accessors
& IRQ_PER_CPU
;
168 irq_set_lockdep_class(unsigned int irq
, struct lock_class_key
*class)
170 struct irq_desc
*desc
= irq_to_desc(irq
);
173 lockdep_set_class(&desc
->lock
, class);
176 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
178 __irq_set_preflow_handler(unsigned int irq
, irq_preflow_handler_t handler
)
180 struct irq_desc
*desc
;
182 desc
= irq_to_desc(irq
);
183 desc
->preflow_handler
= handler
;