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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;
Paul Gortmakerec53cf22011-09-19 20:33:19 -040014struct module;
Thomas Gleixnere1447102010-10-01 16:03:45 +020015/**
16 * struct irq_desc - interrupt descriptor
17 * @irq_data: per irq and chip data passed down to chip functions
18 * @timer_rand_state: pointer to timer rand state struct
19 * @kstat_irqs: irq stats per cpu
Geert Uytterhoeven77076772011-04-10 11:01:52 +020020 * @handle_irq: highlevel irq-events handler
21 * @preflow_handler: handler called before the flow handler (currently used by sparc)
Thomas Gleixnere1447102010-10-01 16:03:45 +020022 * @action: the irq action chain
23 * @status: status information
Thomas Gleixnerdbec07b2011-02-07 20:19:55 +010024 * @core_internal_state__do_not_mess_with_it: core internal status information
Thomas Gleixnere1447102010-10-01 16:03:45 +020025 * @depth: disable-depth, for nested irq_disable() calls
Geert Uytterhoeven0911f122011-04-10 11:01:51 +020026 * @wake_depth: enable depth, for multiple irq_set_irq_wake() callers
Thomas Gleixnere1447102010-10-01 16:03:45 +020027 * @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 * @lock: locking for SMP
Geert Uytterhoeven77076772011-04-10 11:01:52 +020031 * @affinity_hint: hint to user space for preferred irq affinity
Ben Hutchingscd7eab42011-01-19 21:01:44 +000032 * @affinity_notify: context for notification of affinity changes
Thomas Gleixnere1447102010-10-01 16:03:45 +020033 * @pending_mask: pending rebalanced interrupts
Thomas Gleixnerb5faba22011-02-23 23:52:13 +000034 * @threads_oneshot: bitfield to handle shared oneshot threads
Thomas Gleixnere1447102010-10-01 16:03:45 +020035 * @threads_active: number of irqaction threads currently running
36 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
37 * @dir: /proc/irq/ procfs entry
38 * @name: flow handler name for /proc/interrupts output
39 */
40struct irq_desc {
Thomas Gleixnere1447102010-10-01 16:03:45 +020041 struct irq_data irq_data;
Thomas Gleixnere1447102010-10-01 16:03:45 +020042 struct timer_rand_state *timer_rand_state;
Eric Dumazet6c9ae002011-01-13 15:45:38 -080043 unsigned int __percpu *kstat_irqs;
Thomas Gleixnere1447102010-10-01 16:03:45 +020044 irq_flow_handler_t handle_irq;
Thomas Gleixner78129572011-02-10 15:14:20 +010045#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
46 irq_preflow_handler_t preflow_handler;
47#endif
Thomas Gleixnere1447102010-10-01 16:03:45 +020048 struct irqaction *action; /* IRQ action list */
Thomas Gleixnera6967ca2011-02-10 22:01:25 +010049 unsigned int status_use_accessors;
Thomas Gleixnerdbec07b2011-02-07 20:19:55 +010050 unsigned int core_internal_state__do_not_mess_with_it;
Thomas Gleixnere1447102010-10-01 16:03:45 +020051 unsigned int depth; /* nested irq disables */
52 unsigned int wake_depth; /* nested wake enables */
53 unsigned int irq_count; /* For detecting broken IRQs */
54 unsigned long last_unhandled; /* Aging timer for unhandled count */
55 unsigned int irqs_unhandled;
56 raw_spinlock_t lock;
Marc Zyngier31d9d9b2011-09-23 17:03:06 +010057 struct cpumask *percpu_enabled;
Thomas Gleixnere1447102010-10-01 16:03:45 +020058#ifdef CONFIG_SMP
59 const struct cpumask *affinity_hint;
Ben Hutchingscd7eab42011-01-19 21:01:44 +000060 struct irq_affinity_notify *affinity_notify;
Thomas Gleixnere1447102010-10-01 16:03:45 +020061#ifdef CONFIG_GENERIC_PENDING_IRQ
62 cpumask_var_t pending_mask;
63#endif
64#endif
Thomas Gleixnerb5faba22011-02-23 23:52:13 +000065 unsigned long threads_oneshot;
Thomas Gleixnere1447102010-10-01 16:03:45 +020066 atomic_t threads_active;
67 wait_queue_head_t wait_for_threads;
68#ifdef CONFIG_PROC_FS
69 struct proc_dir_entry *dir;
70#endif
Sebastian Andrzej Siewiorb6873802011-07-11 12:17:31 +020071 struct module *owner;
Thomas Gleixnere1447102010-10-01 16:03:45 +020072 const char *name;
73} ____cacheline_internodealigned_in_smp;
74
Thomas Gleixnere1447102010-10-01 16:03:45 +020075#ifndef CONFIG_SPARSE_IRQ
76extern struct irq_desc irq_desc[NR_IRQS];
77#endif
78
Thomas Gleixnere1447102010-10-01 16:03:45 +020079#ifdef CONFIG_GENERIC_HARDIRQS
80
Thomas Gleixnerd9936bb2011-03-11 14:15:35 +010081static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
82{
83 return &desc->irq_data;
84}
85
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +010086static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
87{
88 return desc->irq_data.chip;
89}
90
91static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
92{
93 return desc->irq_data.chip_data;
94}
95
96static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
97{
98 return desc->irq_data.handler_data;
99}
100
101static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
102{
103 return desc->irq_data.msi_desc;
104}
105
Thomas Gleixnere1447102010-10-01 16:03:45 +0200106/*
Thomas Gleixnere1447102010-10-01 16:03:45 +0200107 * Architectures call this to let the generic IRQ layer
108 * handle an interrupt. If the descriptor is attached to an
109 * irqchip-style controller then we call the ->handle_irq() handler,
110 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
111 */
112static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
113{
Thomas Gleixnere1447102010-10-01 16:03:45 +0200114 desc->handle_irq(irq, desc);
Thomas Gleixnere1447102010-10-01 16:03:45 +0200115}
116
Thomas Gleixnerfe12bc22011-05-18 12:48:00 +0200117int generic_handle_irq(unsigned int irq);
Thomas Gleixnere1447102010-10-01 16:03:45 +0200118
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