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[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / linux / irqdesc.h
blob2d921b35212c42bbac394430b50fd90914439e24
1 #ifndef _LINUX_IRQDESC_H
2 #define _LINUX_IRQDESC_H
4 /*
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>
9 */
11 struct irq_affinity_notify;
12 struct proc_dir_entry;
13 struct 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
20 * @preflow_handler: handler called before the flow handler (currently used by sparc)
21 * @action: the irq action chain
22 * @status: status information
23 * @core_internal_state__do_not_mess_with_it: core internal status information
24 * @depth: disable-depth, for nested irq_disable() calls
25 * @wake_depth: enable depth, for multiple irq_set_irq_wake() callers
26 * @irq_count: stats field to detect stalled irqs
27 * @last_unhandled: aging timer for unhandled count
28 * @irqs_unhandled: stats field for spurious unhandled interrupts
29 * @lock: locking for SMP
30 * @affinity_hint: hint to user space for preferred irq affinity
31 * @affinity_notify: context for notification of affinity changes
32 * @pending_mask: pending rebalanced interrupts
33 * @threads_oneshot: bitfield to handle shared oneshot threads
34 * @threads_active: number of irqaction threads currently running
35 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
36 * @dir: /proc/irq/ procfs entry
37 * @name: flow handler name for /proc/interrupts output
39 struct irq_desc {
40 struct irq_data irq_data;
41 struct timer_rand_state *timer_rand_state;
42 unsigned int __percpu *kstat_irqs;
43 irq_flow_handler_t handle_irq;
44 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
45 irq_preflow_handler_t preflow_handler;
46 #endif
47 struct irqaction *action; /* IRQ action list */
48 unsigned int status_use_accessors;
49 unsigned int core_internal_state__do_not_mess_with_it;
50 unsigned int depth; /* nested irq disables */
51 unsigned int wake_depth; /* nested wake enables */
52 unsigned int irq_count; /* For detecting broken IRQs */
53 unsigned long last_unhandled; /* Aging timer for unhandled count */
54 unsigned int irqs_unhandled;
55 raw_spinlock_t lock;
56 #ifdef CONFIG_SMP
57 const struct cpumask *affinity_hint;
58 struct irq_affinity_notify *affinity_notify;
59 #ifdef CONFIG_GENERIC_PENDING_IRQ
60 cpumask_var_t pending_mask;
61 #endif
62 #endif
63 unsigned long threads_oneshot;
64 atomic_t threads_active;
65 wait_queue_head_t wait_for_threads;
66 #ifdef CONFIG_PROC_FS
67 struct proc_dir_entry *dir;
68 #endif
69 const char *name;
70 } ____cacheline_internodealigned_in_smp;
72 #ifndef CONFIG_SPARSE_IRQ
73 extern struct irq_desc irq_desc[NR_IRQS];
74 #endif
76 #ifdef CONFIG_GENERIC_HARDIRQS
78 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
80 return &desc->irq_data;
83 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
85 return desc->irq_data.chip;
88 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
90 return desc->irq_data.chip_data;
93 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
95 return desc->irq_data.handler_data;
98 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
100 return desc->irq_data.msi_desc;
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.
109 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
111 desc->handle_irq(irq, desc);
114 int generic_handle_irq(unsigned int irq);
116 /* Test to see if a driver has successfully requested an irq */
117 static inline int irq_has_action(unsigned int irq)
119 struct irq_desc *desc = irq_to_desc(irq);
120 return desc->action != NULL;
123 /* caller has locked the irq_desc and both params are valid */
124 static inline void __irq_set_handler_locked(unsigned int irq,
125 irq_flow_handler_t handler)
127 struct irq_desc *desc;
129 desc = irq_to_desc(irq);
130 desc->handle_irq = handler;
133 /* caller has locked the irq_desc and both params are valid */
134 static 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)
138 struct irq_desc *desc;
140 desc = irq_to_desc(irq);
141 irq_desc_get_irq_data(desc)->chip = chip;
142 desc->handle_irq = handler;
143 desc->name = name;
146 static inline int irq_balancing_disabled(unsigned int irq)
148 struct irq_desc *desc;
150 desc = irq_to_desc(irq);
151 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
154 static inline void
155 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
157 struct irq_desc *desc = irq_to_desc(irq);
159 if (desc)
160 lockdep_set_class(&desc->lock, class);
163 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
164 static inline void
165 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
167 struct irq_desc *desc;
169 desc = irq_to_desc(irq);
170 desc->preflow_handler = handler;
172 #endif
173 #endif
175 #endif