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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;
Paul Gortmakerec53cf22011-09-19 20:33:19 -040013struct module;
Thomas Gleixner293a7a02012-10-16 15:07:49 -070014struct irq_desc;
15
Thomas Gleixnere1447102010-10-01 16:03:45 +020016/**
17 * struct irq_desc - interrupt descriptor
18 * @irq_data: per irq and chip data passed down to chip functions
Thomas Gleixnere1447102010-10-01 16:03:45 +020019 * @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;
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;
Marc Zyngier31d9d9b2011-09-23 17:03:06 +010056 struct cpumask *percpu_enabled;
Thomas Gleixnere1447102010-10-01 16:03:45 +020057#ifdef CONFIG_SMP
58 const struct cpumask *affinity_hint;
Ben Hutchingscd7eab42011-01-19 21:01:44 +000059 struct irq_affinity_notify *affinity_notify;
Thomas Gleixnere1447102010-10-01 16:03:45 +020060#ifdef CONFIG_GENERIC_PENDING_IRQ
61 cpumask_var_t pending_mask;
62#endif
63#endif
Thomas Gleixnerb5faba22011-02-23 23:52:13 +000064 unsigned long threads_oneshot;
Thomas Gleixnere1447102010-10-01 16:03:45 +020065 atomic_t threads_active;
66 wait_queue_head_t wait_for_threads;
67#ifdef CONFIG_PROC_FS
68 struct proc_dir_entry *dir;
69#endif
Thomas Gleixner293a7a02012-10-16 15:07:49 -070070 int parent_irq;
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 Gleixnerd9936bb2011-03-11 14:15:35 +010079static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
80{
81 return &desc->irq_data;
82}
83
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +010084static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
85{
86 return desc->irq_data.chip;
87}
88
89static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
90{
91 return desc->irq_data.chip_data;
92}
93
94static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
95{
96 return desc->irq_data.handler_data;
97}
98
99static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
100{
101 return desc->irq_data.msi_desc;
102}
103
Thomas Gleixnere1447102010-10-01 16:03:45 +0200104/*
Thomas Gleixnere1447102010-10-01 16:03:45 +0200105 * Architectures call this to let the generic IRQ layer
106 * handle an interrupt. If the descriptor is attached to an
107 * irqchip-style controller then we call the ->handle_irq() handler,
108 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
109 */
110static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
111{
Thomas Gleixnere1447102010-10-01 16:03:45 +0200112 desc->handle_irq(irq, desc);
Thomas Gleixnere1447102010-10-01 16:03:45 +0200113}
114
Thomas Gleixnerfe12bc22011-05-18 12:48:00 +0200115int generic_handle_irq(unsigned int irq);
Thomas Gleixnere1447102010-10-01 16:03:45 +0200116
117/* Test to see if a driver has successfully requested an irq */
118static 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
Thomas Gleixnera2e84612011-03-23 13:10:31 +0100124/* caller has locked the irq_desc and both params are valid */
125static 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 */
135static 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
Thomas Gleixnere1447102010-10-01 16:03:45 +0200147static inline int irq_balancing_disabled(unsigned int irq)
148{
149 struct irq_desc *desc;
150
151 desc = irq_to_desc(irq);
Thomas Gleixner0c6f8a82011-03-28 13:32:20 +0200152 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
Thomas Gleixnere1447102010-10-01 16:03:45 +0200153}
Thomas Gleixnere1447102010-10-01 16:03:45 +0200154
Vinayak Kale7f4a8e72013-12-04 10:09:50 +0000155static inline int irq_is_percpu(unsigned int irq)
156{
157 struct irq_desc *desc;
158
159 desc = irq_to_desc(irq);
160 return desc->status_use_accessors & IRQ_PER_CPU;
161}
162
Thomas Gleixnerd3e17de2011-03-22 17:08:15 +0100163static inline void
164irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
165{
166 struct irq_desc *desc = irq_to_desc(irq);
167
168 if (desc)
169 lockdep_set_class(&desc->lock, class);
170}
171
Thomas Gleixner78129572011-02-10 15:14:20 +0100172#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
173static inline void
174__irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
175{
176 struct irq_desc *desc;
177
178 desc = irq_to_desc(irq);
179 desc->preflow_handler = handler;
180}
181#endif
Thomas Gleixnere1447102010-10-01 16:03:45 +0200182
183#endif