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Thomas Gleixnere1447102010-10-01 16:03:45 +02001#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
Ben Hutchingscd7eab42011-01-19 21:01:44 +000011struct irq_affinity_notify;
Thomas Gleixnere1447102010-10-01 16:03:45 +020012struct proc_dir_entry;
13struct timer_rand_state;
Thomas Gleixnere1447102010-10-01 16:03:45 +020014/**
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
Thomas Gleixnerdbec07b2011-02-07 20:19:55 +010022 * @core_internal_state__do_not_mess_with_it: core internal status information
Thomas Gleixnere1447102010-10-01 16:03:45 +020023 * @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
Ben Hutchingscd7eab42011-01-19 21:01:44 +000029 * @affinity_notify: context for notification of affinity changes
Thomas Gleixnere1447102010-10-01 16:03:45 +020030 * @pending_mask: pending rebalanced interrupts
31 * @threads_active: number of irqaction threads currently running
32 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
33 * @dir: /proc/irq/ procfs entry
34 * @name: flow handler name for /proc/interrupts output
35 */
36struct irq_desc {
37
38#ifdef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
39 struct irq_data irq_data;
40#else
41 /*
42 * This union will go away, once we fixed the direct access to
43 * irq_desc all over the place. The direct fields are a 1:1
44 * overlay of irq_data.
45 */
46 union {
47 struct irq_data irq_data;
48 struct {
49 unsigned int irq;
50 unsigned int node;
51 struct irq_chip *chip;
52 void *handler_data;
53 void *chip_data;
54 struct msi_desc *msi_desc;
55#ifdef CONFIG_SMP
56 cpumask_var_t affinity;
57#endif
Thomas Gleixnere1447102010-10-01 16:03:45 +020058 };
59 };
60#endif
61
62 struct timer_rand_state *timer_rand_state;
Eric Dumazet6c9ae002011-01-13 15:45:38 -080063 unsigned int __percpu *kstat_irqs;
Thomas Gleixnere1447102010-10-01 16:03:45 +020064 irq_flow_handler_t handle_irq;
65 struct irqaction *action; /* IRQ action list */
66 unsigned int status; /* IRQ status */
Thomas Gleixnerdbec07b2011-02-07 20:19:55 +010067 unsigned int core_internal_state__do_not_mess_with_it;
Thomas Gleixnere1447102010-10-01 16:03:45 +020068 unsigned int depth; /* nested irq disables */
69 unsigned int wake_depth; /* nested wake enables */
70 unsigned int irq_count; /* For detecting broken IRQs */
71 unsigned long last_unhandled; /* Aging timer for unhandled count */
72 unsigned int irqs_unhandled;
73 raw_spinlock_t lock;
74#ifdef CONFIG_SMP
75 const struct cpumask *affinity_hint;
Ben Hutchingscd7eab42011-01-19 21:01:44 +000076 struct irq_affinity_notify *affinity_notify;
Thomas Gleixnere1447102010-10-01 16:03:45 +020077#ifdef CONFIG_GENERIC_PENDING_IRQ
78 cpumask_var_t pending_mask;
79#endif
80#endif
81 atomic_t threads_active;
82 wait_queue_head_t wait_for_threads;
83#ifdef CONFIG_PROC_FS
84 struct proc_dir_entry *dir;
85#endif
86 const char *name;
87} ____cacheline_internodealigned_in_smp;
88
Thomas Gleixnere1447102010-10-01 16:03:45 +020089#ifndef CONFIG_SPARSE_IRQ
90extern struct irq_desc irq_desc[NR_IRQS];
91#endif
92
Thomas Gleixner78f90d92010-09-29 17:18:47 +020093/* Will be removed once the last users in power and sh are gone */
94extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);
Thomas Gleixnere1447102010-10-01 16:03:45 +020095static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
96{
97 return desc;
98}
Thomas Gleixnere1447102010-10-01 16:03:45 +020099
100#ifdef CONFIG_GENERIC_HARDIRQS
101
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +0100102static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
103{
104 return desc->irq_data.chip;
105}
106
107static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
108{
109 return desc->irq_data.chip_data;
110}
111
112static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
113{
114 return desc->irq_data.handler_data;
115}
116
117static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
118{
119 return desc->irq_data.msi_desc;
120}
121
122#ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
123static inline struct irq_chip *get_irq_desc_chip(struct irq_desc *desc)
124{
125 return irq_desc_get_chip(desc);
126}
127static inline void *get_irq_desc_data(struct irq_desc *desc)
128{
129 return irq_desc_get_handler_data(desc);
130}
131
132static inline void *get_irq_desc_chip_data(struct irq_desc *desc)
133{
134 return irq_desc_get_chip_data(desc);
135}
136
137static inline struct msi_desc *get_irq_desc_msi(struct irq_desc *desc)
138{
139 return irq_desc_get_msi_desc(desc);
140}
141#endif
Thomas Gleixnere1447102010-10-01 16:03:45 +0200142
143/*
Thomas Gleixnere1447102010-10-01 16:03:45 +0200144 * Architectures call this to let the generic IRQ layer
145 * handle an interrupt. If the descriptor is attached to an
146 * irqchip-style controller then we call the ->handle_irq() handler,
147 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
148 */
149static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
150{
Thomas Gleixnere1447102010-10-01 16:03:45 +0200151 desc->handle_irq(irq, desc);
Thomas Gleixnere1447102010-10-01 16:03:45 +0200152}
153
154static inline void generic_handle_irq(unsigned int irq)
155{
156 generic_handle_irq_desc(irq, irq_to_desc(irq));
157}
158
159/* Test to see if a driver has successfully requested an irq */
160static inline int irq_has_action(unsigned int irq)
161{
162 struct irq_desc *desc = irq_to_desc(irq);
163 return desc->action != NULL;
164}
165
166static inline int irq_balancing_disabled(unsigned int irq)
167{
168 struct irq_desc *desc;
169
170 desc = irq_to_desc(irq);
171 return desc->status & IRQ_NO_BALANCING_MASK;
172}
173
174/* caller has locked the irq_desc and both params are valid */
175static inline void __set_irq_handler_unlocked(int irq,
176 irq_flow_handler_t handler)
177{
178 struct irq_desc *desc;
179
180 desc = irq_to_desc(irq);
181 desc->handle_irq = handler;
182}
183#endif
184
185#endif