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 unsigned int __percpu *kstat_irqs;
43 irq_flow_handler_t handle_irq;
44 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
45 irq_preflow_handler_t preflow_handler;
46 #endif
47 struct irqaction *action; /* IRQ action list */
48 unsigned int status_use_accessors;
49 unsigned int core_internal_state__do_not_mess_with_it;
50 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 struct cpumask *percpu_enabled;
57 #ifdef CONFIG_SMP
58 const struct cpumask *affinity_hint;
59 struct irq_affinity_notify *affinity_notify;
60 #ifdef CONFIG_GENERIC_PENDING_IRQ
61 cpumask_var_t pending_mask;
62 #endif
63 #endif
64 unsigned long threads_oneshot;
65 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
70 struct module *owner;
71 const char *name;
72 } ____cacheline_internodealigned_in_smp;
73
74 #ifndef CONFIG_SPARSE_IRQ
75 extern struct irq_desc irq_desc[NR_IRQS];
76 #endif
77
78 #ifdef CONFIG_GENERIC_HARDIRQS
79
irq_desc_get_irq_data(struct irq_desc * desc)80 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
81 {
82 return &desc->irq_data;
83 }
84
irq_desc_get_chip(struct irq_desc * desc)85 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
86 {
87 return desc->irq_data.chip;
88 }
89
irq_desc_get_chip_data(struct irq_desc * desc)90 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
91 {
92 return desc->irq_data.chip_data;
93 }
94
irq_desc_get_handler_data(struct irq_desc * desc)95 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
96 {
97 return desc->irq_data.handler_data;
98 }
99
irq_desc_get_msi_desc(struct irq_desc * desc)100 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
101 {
102 return desc->irq_data.msi_desc;
103 }
104
105 /*
106 * Architectures call this to let the generic IRQ layer
107 * handle an interrupt. If the descriptor is attached to an
108 * irqchip-style controller then we call the ->handle_irq() handler,
109 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
110 */
generic_handle_irq_desc(unsigned int irq,struct irq_desc * desc)111 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
112 {
113 desc->handle_irq(irq, desc);
114 }
115
116 int generic_handle_irq(unsigned int irq);
117
118 /* Test to see if a driver has successfully requested an irq */
irq_has_action(unsigned int irq)119 static inline int irq_has_action(unsigned int irq)
120 {
121 struct irq_desc *desc = irq_to_desc(irq);
122 return desc->action != NULL;
123 }
124
125 /* caller has locked the irq_desc and both params are valid */
__irq_set_handler_locked(unsigned int irq,irq_flow_handler_t handler)126 static inline void __irq_set_handler_locked(unsigned int irq,
127 irq_flow_handler_t handler)
128 {
129 struct irq_desc *desc;
130
131 desc = irq_to_desc(irq);
132 desc->handle_irq = handler;
133 }
134
135 /* caller has locked the irq_desc and both params are valid */
136 static inline void
__irq_set_chip_handler_name_locked(unsigned int irq,struct irq_chip * chip,irq_flow_handler_t handler,const char * name)137 __irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
138 irq_flow_handler_t handler, const char *name)
139 {
140 struct irq_desc *desc;
141
142 desc = irq_to_desc(irq);
143 irq_desc_get_irq_data(desc)->chip = chip;
144 desc->handle_irq = handler;
145 desc->name = name;
146 }
147
irq_balancing_disabled(unsigned int irq)148 static inline int irq_balancing_disabled(unsigned int irq)
149 {
150 struct irq_desc *desc;
151
152 desc = irq_to_desc(irq);
153 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
154 }
155
156 static inline void
irq_set_lockdep_class(unsigned int irq,struct lock_class_key * class)157 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
158 {
159 struct irq_desc *desc = irq_to_desc(irq);
160
161 if (desc)
162 lockdep_set_class(&desc->lock, class);
163 }
164
165 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
166 static inline void
__irq_set_preflow_handler(unsigned int irq,irq_preflow_handler_t handler)167 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
168 {
169 struct irq_desc *desc;
170
171 desc = irq_to_desc(irq);
172 desc->preflow_handler = handler;
173 }
174 #endif
175 #endif
176
177 #endif
178