1 #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
11 struct irq_affinity_notify;
12 struct proc_dir_entry;
13 struct timer_rand_state;
14 struct module;
15 /**
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
20 * @handle_irq: highlevel irq-events handler
21 * @preflow_handler: handler called before the flow handler (currently used by sparc)
22 * @action: the irq action chain
23 * @status: status information
24 * @core_internal_state__do_not_mess_with_it: core internal status information
25 * @depth: disable-depth, for nested irq_disable() calls
26 * @wake_depth: enable depth, for multiple irq_set_irq_wake() callers
27 * @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
31 * @affinity_hint: hint to user space for preferred irq affinity
32 * @affinity_notify: context for notification of affinity changes
33 * @pending_mask: pending rebalanced interrupts
34 * @threads_oneshot: bitfield to handle shared oneshot threads
35 * @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 */
40 struct irq_desc {
41 struct irq_data irq_data;
42 struct timer_rand_state *timer_rand_state;
43 unsigned int __percpu *kstat_irqs;
44 irq_flow_handler_t handle_irq;
45 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
46 irq_preflow_handler_t preflow_handler;
47 #endif
48 struct irqaction *action; /* IRQ action list */
49 unsigned int status_use_accessors;
50 unsigned int core_internal_state__do_not_mess_with_it;
51 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;
57 struct cpumask *percpu_enabled;
58 #ifdef CONFIG_SMP
59 const struct cpumask *affinity_hint;
60 struct irq_affinity_notify *affinity_notify;
61 #ifdef CONFIG_GENERIC_PENDING_IRQ
62 cpumask_var_t pending_mask;
63 #endif
64 #endif
65 unsigned long threads_oneshot;
66 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
71 struct module *owner;
72 const char *name;
73 } ____cacheline_internodealigned_in_smp;
74
75 #ifndef CONFIG_SPARSE_IRQ
76 extern struct irq_desc irq_desc[NR_IRQS];
77 #endif
78
79 #ifdef CONFIG_GENERIC_HARDIRQS
80
irq_desc_get_irq_data(struct irq_desc * desc)81 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
82 {
83 return &desc->irq_data;
84 }
85
irq_desc_get_chip(struct irq_desc * desc)86 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
87 {
88 return desc->irq_data.chip;
89 }
90
irq_desc_get_chip_data(struct irq_desc * desc)91 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
92 {
93 return desc->irq_data.chip_data;
94 }
95
irq_desc_get_handler_data(struct irq_desc * desc)96 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
97 {
98 return desc->irq_data.handler_data;
99 }
100
irq_desc_get_msi_desc(struct irq_desc * desc)101 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
102 {
103 return desc->irq_data.msi_desc;
104 }
105
106 /*
107 * 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 */
generic_handle_irq_desc(unsigned int irq,struct irq_desc * desc)112 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
113 {
114 desc->handle_irq(irq, desc);
115 }
116
117 int generic_handle_irq(unsigned int irq);
118
119 /* Test to see if a driver has successfully requested an irq */
irq_has_action(unsigned int irq)120 static 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
126 /* caller has locked the irq_desc and both params are valid */
__irq_set_handler_locked(unsigned int irq,irq_flow_handler_t handler)127 static 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 */
137 static inline void
__irq_set_chip_handler_name_locked(unsigned int irq,struct irq_chip * chip,irq_flow_handler_t handler,const char * name)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
irq_balancing_disabled(unsigned int irq)149 static inline int irq_balancing_disabled(unsigned int irq)
150 {
151 struct irq_desc *desc;
152
153 desc = irq_to_desc(irq);
154 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
155 }
156
157 static inline void
irq_set_lockdep_class(unsigned int irq,struct lock_class_key * class)158 irq_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
166 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
167 static inline void
__irq_set_preflow_handler(unsigned int irq,irq_preflow_handler_t handler)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
176 #endif
177
178 #endif
179