Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
[linux-2.6.git] / include / linux / irqdesc.h
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
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 [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  */
37 struct 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
71 extern struct irq_desc irq_desc[NR_IRQS];
72 #endif
73
74 #ifdef CONFIG_GENERIC_HARDIRQS
75
76 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
77 {
78         return &desc->irq_data;
79 }
80
81 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
82 {
83         return desc->irq_data.chip;
84 }
85
86 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
87 {
88         return desc->irq_data.chip_data;
89 }
90
91 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
92 {
93         return desc->irq_data.handler_data;
94 }
95
96 static 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  */
107 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
108 {
109         desc->handle_irq(irq, desc);
110 }
111
112 static 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 */
118 static 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 */
125 static 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 */
135 static 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
147 static 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
155 static inline void
156 irq_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
165 static 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