blob: 1595f9176b43dc1e0f3d2c521cfb4f012d01c2dc [file] [log] [blame]
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
Thomas Gleixnerb5faba22011-02-23 23:52:13 +000031 * @threads_oneshot: bitfield to handle shared oneshot threads
Thomas Gleixnere1447102010-10-01 16:03:45 +020032 * @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 */
37struct irq_desc {
38
39#ifdef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
40 struct irq_data irq_data;
41#else
42 /*
43 * This union will go away, once we fixed the direct access to
44 * irq_desc all over the place. The direct fields are a 1:1
45 * overlay of irq_data.
46 */
47 union {
48 struct irq_data irq_data;
49 struct {
50 unsigned int irq;
51 unsigned int node;
Thomas Gleixner91c49912011-02-03 20:48:29 +010052 unsigned int pad_do_not_even_think_about_it;
Thomas Gleixnere1447102010-10-01 16:03:45 +020053 struct irq_chip *chip;
54 void *handler_data;
55 void *chip_data;
56 struct msi_desc *msi_desc;
57#ifdef CONFIG_SMP
58 cpumask_var_t affinity;
59#endif
Thomas Gleixnere1447102010-10-01 16:03:45 +020060 };
61 };
62#endif
63
64 struct timer_rand_state *timer_rand_state;
Eric Dumazet6c9ae002011-01-13 15:45:38 -080065 unsigned int __percpu *kstat_irqs;
Thomas Gleixnere1447102010-10-01 16:03:45 +020066 irq_flow_handler_t handle_irq;
Thomas Gleixner78129572011-02-10 15:14:20 +010067#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
68 irq_preflow_handler_t preflow_handler;
69#endif
Thomas Gleixnere1447102010-10-01 16:03:45 +020070 struct irqaction *action; /* IRQ action list */
Thomas Gleixnera6967ca2011-02-10 22:01:25 +010071#ifdef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
72 unsigned int status_use_accessors;
73#else
Thomas Gleixnere1447102010-10-01 16:03:45 +020074 unsigned int status; /* IRQ status */
Thomas Gleixnera6967ca2011-02-10 22:01:25 +010075#endif
Thomas Gleixnerdbec07b2011-02-07 20:19:55 +010076 unsigned int core_internal_state__do_not_mess_with_it;
Thomas Gleixnere1447102010-10-01 16:03:45 +020077 unsigned int depth; /* nested irq disables */
78 unsigned int wake_depth; /* nested wake enables */
79 unsigned int irq_count; /* For detecting broken IRQs */
80 unsigned long last_unhandled; /* Aging timer for unhandled count */
81 unsigned int irqs_unhandled;
82 raw_spinlock_t lock;
83#ifdef CONFIG_SMP
84 const struct cpumask *affinity_hint;
Ben Hutchingscd7eab42011-01-19 21:01:44 +000085 struct irq_affinity_notify *affinity_notify;
Thomas Gleixnere1447102010-10-01 16:03:45 +020086#ifdef CONFIG_GENERIC_PENDING_IRQ
87 cpumask_var_t pending_mask;
88#endif
89#endif
Thomas Gleixnerb5faba22011-02-23 23:52:13 +000090 unsigned long threads_oneshot;
Thomas Gleixnere1447102010-10-01 16:03:45 +020091 atomic_t threads_active;
92 wait_queue_head_t wait_for_threads;
93#ifdef CONFIG_PROC_FS
94 struct proc_dir_entry *dir;
95#endif
96 const char *name;
97} ____cacheline_internodealigned_in_smp;
98
Thomas Gleixnere1447102010-10-01 16:03:45 +020099#ifndef CONFIG_SPARSE_IRQ
100extern struct irq_desc irq_desc[NR_IRQS];
101#endif
102
Thomas Gleixnere1447102010-10-01 16:03:45 +0200103#ifdef CONFIG_GENERIC_HARDIRQS
104
Thomas Gleixnerd9936bb2011-03-11 14:15:35 +0100105static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
106{
107 return &desc->irq_data;
108}
109
Thomas Gleixnera0cd9ca2011-02-10 11:36:33 +0100110static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
111{
112 return desc->irq_data.chip;
113}
114
115static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
116{
117 return desc->irq_data.chip_data;
118}
119
120static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
121{
122 return desc->irq_data.handler_data;
123}
124
125static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
126{
127 return desc->irq_data.msi_desc;
128}
129
130#ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
131static inline struct irq_chip *get_irq_desc_chip(struct irq_desc *desc)
132{
133 return irq_desc_get_chip(desc);
134}
135static inline void *get_irq_desc_data(struct irq_desc *desc)
136{
137 return irq_desc_get_handler_data(desc);
138}
139
140static inline void *get_irq_desc_chip_data(struct irq_desc *desc)
141{
142 return irq_desc_get_chip_data(desc);
143}
144
145static inline struct msi_desc *get_irq_desc_msi(struct irq_desc *desc)
146{
147 return irq_desc_get_msi_desc(desc);
148}
149#endif
Thomas Gleixnere1447102010-10-01 16:03:45 +0200150
151/*
Thomas Gleixnere1447102010-10-01 16:03:45 +0200152 * Architectures call this to let the generic IRQ layer
153 * handle an interrupt. If the descriptor is attached to an
154 * irqchip-style controller then we call the ->handle_irq() handler,
155 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
156 */
157static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
158{
Thomas Gleixnere1447102010-10-01 16:03:45 +0200159 desc->handle_irq(irq, desc);
Thomas Gleixnere1447102010-10-01 16:03:45 +0200160}
161
162static inline void generic_handle_irq(unsigned int irq)
163{
164 generic_handle_irq_desc(irq, irq_to_desc(irq));
165}
166
167/* Test to see if a driver has successfully requested an irq */
168static inline int irq_has_action(unsigned int irq)
169{
170 struct irq_desc *desc = irq_to_desc(irq);
171 return desc->action != NULL;
172}
173
Thomas Gleixnera6967ca2011-02-10 22:01:25 +0100174#ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
Thomas Gleixnere1447102010-10-01 16:03:45 +0200175static inline int irq_balancing_disabled(unsigned int irq)
176{
177 struct irq_desc *desc;
178
179 desc = irq_to_desc(irq);
180 return desc->status & IRQ_NO_BALANCING_MASK;
181}
Thomas Gleixnera6967ca2011-02-10 22:01:25 +0100182#endif
Thomas Gleixnere1447102010-10-01 16:03:45 +0200183
184/* caller has locked the irq_desc and both params are valid */
185static inline void __set_irq_handler_unlocked(int irq,
186 irq_flow_handler_t handler)
187{
188 struct irq_desc *desc;
189
190 desc = irq_to_desc(irq);
191 desc->handle_irq = handler;
192}
Thomas Gleixner78129572011-02-10 15:14:20 +0100193
Thomas Gleixnerd3e17de2011-03-22 17:08:15 +0100194static inline void
195irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
196{
197 struct irq_desc *desc = irq_to_desc(irq);
198
199 if (desc)
200 lockdep_set_class(&desc->lock, class);
201}
202
Thomas Gleixner78129572011-02-10 15:14:20 +0100203#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
204static inline void
205__irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
206{
207 struct irq_desc *desc;
208
209 desc = irq_to_desc(irq);
210 desc->preflow_handler = handler;
211}
212#endif
Thomas Gleixnere1447102010-10-01 16:03:45 +0200213#endif
214
215#endif