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 * @threads_handled: stats field for deferred spurious detection of threaded handlers
31 * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers
32 * @lock: locking for SMP
33 * @affinity_hint: hint to user space for preferred irq affinity
34 * @affinity_notify: context for notification of affinity changes
35 * @pending_mask: pending rebalanced interrupts
36 * @threads_oneshot: bitfield to handle shared oneshot threads
37 * @threads_active: number of irqaction threads currently running
38 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
39 * @dir: /proc/irq/ procfs entry
40 * @name: flow handler name for /proc/interrupts output
41 */
42 struct irq_desc {
43 struct irq_data irq_data;
44 unsigned int __percpu *kstat_irqs;
45 irq_flow_handler_t handle_irq;
46 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
47 irq_preflow_handler_t preflow_handler;
48 #endif
49 struct irqaction *action; /* IRQ action list */
50 unsigned int status_use_accessors;
51 unsigned int core_internal_state__do_not_mess_with_it;
52 unsigned int depth; /* nested irq disables */
53 unsigned int wake_depth; /* nested wake enables */
54 unsigned int irq_count; /* For detecting broken IRQs */
55 unsigned long last_unhandled; /* Aging timer for unhandled count */
56 unsigned int irqs_unhandled;
57 atomic_t threads_handled;
58 int threads_handled_last;
59 raw_spinlock_t lock;
60 struct cpumask *percpu_enabled;
61 #ifdef CONFIG_SMP
62 const struct cpumask *affinity_hint;
63 struct irq_affinity_notify *affinity_notify;
64 #ifdef CONFIG_GENERIC_PENDING_IRQ
65 cpumask_var_t pending_mask;
66 #endif
67 #endif
68 unsigned long threads_oneshot;
69 atomic_t threads_active;
70 wait_queue_head_t wait_for_threads;
71 #ifdef CONFIG_PROC_FS
72 struct proc_dir_entry *dir;
73 #endif
74 struct module *owner;
75 const char *name;
76 } ____cacheline_internodealigned_in_smp;
77
78 #ifndef CONFIG_SPARSE_IRQ
79 extern struct irq_desc irq_desc[NR_IRQS];
80 #endif
81
82 #ifdef CONFIG_GENERIC_HARDIRQS
83
irq_desc_get_irq_data(struct irq_desc * desc)84 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
85 {
86 return &desc->irq_data;
87 }
88
irq_desc_get_chip(struct irq_desc * desc)89 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
90 {
91 return desc->irq_data.chip;
92 }
93
irq_desc_get_chip_data(struct irq_desc * desc)94 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
95 {
96 return desc->irq_data.chip_data;
97 }
98
irq_desc_get_handler_data(struct irq_desc * desc)99 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
100 {
101 return desc->irq_data.handler_data;
102 }
103
irq_desc_get_msi_desc(struct irq_desc * desc)104 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
105 {
106 return desc->irq_data.msi_desc;
107 }
108
109 /*
110 * Architectures call this to let the generic IRQ layer
111 * handle an interrupt. If the descriptor is attached to an
112 * irqchip-style controller then we call the ->handle_irq() handler,
113 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
114 */
generic_handle_irq_desc(unsigned int irq,struct irq_desc * desc)115 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
116 {
117 desc->handle_irq(irq, desc);
118 }
119
120 int generic_handle_irq(unsigned int irq);
121
122 /* Test to see if a driver has successfully requested an irq */
irq_has_action(unsigned int irq)123 static inline int irq_has_action(unsigned int irq)
124 {
125 struct irq_desc *desc = irq_to_desc(irq);
126 return desc->action != NULL;
127 }
128
129 /* caller has locked the irq_desc and both params are valid */
__irq_set_handler_locked(unsigned int irq,irq_flow_handler_t handler)130 static inline void __irq_set_handler_locked(unsigned int irq,
131 irq_flow_handler_t handler)
132 {
133 struct irq_desc *desc;
134
135 desc = irq_to_desc(irq);
136 desc->handle_irq = handler;
137 }
138
139 /* caller has locked the irq_desc and both params are valid */
140 static inline void
__irq_set_chip_handler_name_locked(unsigned int irq,struct irq_chip * chip,irq_flow_handler_t handler,const char * name)141 __irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
142 irq_flow_handler_t handler, const char *name)
143 {
144 struct irq_desc *desc;
145
146 desc = irq_to_desc(irq);
147 irq_desc_get_irq_data(desc)->chip = chip;
148 desc->handle_irq = handler;
149 desc->name = name;
150 }
151
irq_balancing_disabled(unsigned int irq)152 static inline int irq_balancing_disabled(unsigned int irq)
153 {
154 struct irq_desc *desc;
155
156 desc = irq_to_desc(irq);
157 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
158 }
159
160 static inline void
irq_set_lockdep_class(unsigned int irq,struct lock_class_key * class)161 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
162 {
163 struct irq_desc *desc = irq_to_desc(irq);
164
165 if (desc)
166 lockdep_set_class(&desc->lock, class);
167 }
168
169 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
170 static inline void
__irq_set_preflow_handler(unsigned int irq,irq_preflow_handler_t handler)171 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
172 {
173 struct irq_desc *desc;
174
175 desc = irq_to_desc(irq);
176 desc->preflow_handler = handler;
177 }
178 #endif
179 #endif
180
181 #endif
182