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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
Geert Uytterhoeven77076772011-04-10 11:01:52 +020019 * @handle_irq: highlevel irq-events handler
20 * @preflow_handler: handler called before the flow handler (currently used by sparc)
Thomas Gleixnere1447102010-10-01 16:03:45 +020021 * @action: the irq action chain
22 * @status: status information
Thomas Gleixnerdbec07b2011-02-07 20:19:55 +010023 * @core_internal_state__do_not_mess_with_it: core internal status information
Thomas Gleixnere1447102010-10-01 16:03:45 +020024 * @depth: disable-depth, for nested irq_disable() calls
Geert Uytterhoeven0911f122011-04-10 11:01:51 +020025 * @wake_depth: enable depth, for multiple irq_set_irq_wake() callers
Thomas Gleixnere1447102010-10-01 16:03:45 +020026 * @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
Geert Uytterhoeven77076772011-04-10 11:01:52 +020030 * @affinity_hint: hint to user space for preferred irq affinity
Ben Hutchingscd7eab42011-01-19 21:01:44 +000031 * @affinity_notify: context for notification of affinity changes
Thomas Gleixnere1447102010-10-01 16:03:45 +020032 * @pending_mask: pending rebalanced interrupts
Thomas Gleixnerb5faba22011-02-23 23:52:13 +000033 * @threads_oneshot: bitfield to handle shared oneshot threads
Thomas Gleixnere1447102010-10-01 16:03:45 +020034 * @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
38 */
39struct irq_desc {
Thomas Gleixnere1447102010-10-01 16:03:45 +020040 struct irq_data irq_data;
Thomas Gleixnere1447102010-10-01 16:03:45 +020041 struct timer_rand_state *timer_rand_state;
Eric Dumazet6c9ae002011-01-13 15:45:38 -080042 unsigned int __percpu *kstat_irqs;
Thomas Gleixnere1447102010-10-01 16:03:45 +020043 irq_flow_handler_t handle_irq;
Thomas Gleixner78129572011-02-10 15:14:20 +010044#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
45 irq_preflow_handler_t preflow_handler;
46#endif
Thomas Gleixnere1447102010-10-01 16:03:45 +020047 struct irqaction *action; /* IRQ action list */
Thomas Gleixnera6967ca2011-02-10 22:01:25 +010048 unsigned int status_use_accessors;
Thomas Gleixnerdbec07b2011-02-07 20:19:55 +010049 unsigned int core_internal_state__do_not_mess_with_it;
Thomas Gleixnere1447102010-10-01 16:03:45 +020050 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;
Ben Hutchingscd7eab42011-01-19 21:01:44 +000058 struct irq_affinity_notify *affinity_notify;
Thomas Gleixnere1447102010-10-01 16:03:45 +020059#ifdef CONFIG_GENERIC_PENDING_IRQ
60 cpumask_var_t pending_mask;
61#endif
62#endif
Thomas Gleixnerb5faba22011-02-23 23:52:13 +000063 unsigned long threads_oneshot;
Thomas Gleixnere1447102010-10-01 16:03:45 +020064 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;
71
Thomas Gleixnere1447102010-10-01 16:03:45 +020072#ifndef CONFIG_SPARSE_IRQ
73extern struct irq_desc irq_desc[NR_IRQS];
74#endif
75
Thomas Gleixnere1447102010-10-01 16:03:45 +020076#ifdef CONFIG_GENERIC_HARDIRQS
77
Thomas Gleixnerd9936bb2011-03-11 14:15:35 +010078static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
79{
80 return &desc->irq_data;
81}
82
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +010083static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
84{
85 return desc->irq_data.chip;
86}
87
88static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
89{
90 return desc->irq_data.chip_data;
91}
92
93static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
94{
95 return desc->irq_data.handler_data;
96}
97
98static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
99{
100 return desc->irq_data.msi_desc;
101}
102
Thomas Gleixnere1447102010-10-01 16:03:45 +0200103/*
Thomas Gleixnere1447102010-10-01 16:03:45 +0200104 * 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.
108 */
109static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
110{
Thomas Gleixnere1447102010-10-01 16:03:45 +0200111 desc->handle_irq(irq, desc);
Thomas Gleixnere1447102010-10-01 16:03:45 +0200112}
113
114static inline void generic_handle_irq(unsigned int irq)
115{
116 generic_handle_irq_desc(irq, irq_to_desc(irq));
117}
118
119/* Test to see if a driver has successfully requested an irq */
120static inline int irq_has_action(unsigned int irq)
121{
122 struct irq_desc *desc = irq_to_desc(irq);
123 return desc->action != NULL;
124}
125
Thomas Gleixnera2e84612011-03-23 13:10:31 +0100126/* caller has locked the irq_desc and both params are valid */
127static inline void __irq_set_handler_locked(unsigned int irq,
128 irq_flow_handler_t handler)
129{
130 struct irq_desc *desc;
131
132 desc = irq_to_desc(irq);
133 desc->handle_irq = handler;
134}
135
136/* caller has locked the irq_desc and both params are valid */
137static inline void
138__irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
139 irq_flow_handler_t handler, const char *name)
140{
141 struct irq_desc *desc;
142
143 desc = irq_to_desc(irq);
144 irq_desc_get_irq_data(desc)->chip = chip;
145 desc->handle_irq = handler;
146 desc->name = name;
147}
148
Thomas Gleixnere1447102010-10-01 16:03:45 +0200149static inline int irq_balancing_disabled(unsigned int irq)
150{
151 struct irq_desc *desc;
152
153 desc = irq_to_desc(irq);
Thomas Gleixner0c6f8a82011-03-28 13:32:20 +0200154 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
Thomas Gleixnere1447102010-10-01 16:03:45 +0200155}
Thomas Gleixnere1447102010-10-01 16:03:45 +0200156
Thomas Gleixnerd3e17de2011-03-22 17:08:15 +0100157static inline void
158irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
159{
160 struct irq_desc *desc = irq_to_desc(irq);
161
162 if (desc)
163 lockdep_set_class(&desc->lock, class);
164}
165
Thomas Gleixner78129572011-02-10 15:14:20 +0100166#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
167static inline void
168__irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
169{
170 struct irq_desc *desc;
171
172 desc = irq_to_desc(irq);
173 desc->preflow_handler = handler;
174}
175#endif
Thomas Gleixnere1447102010-10-01 16:03:45 +0200176#endif
177
178#endif