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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 proc_dir_entry; |
12 | struct timer_rand_state; |
13 | /** |
14 | * struct irq_desc - interrupt descriptor |
15 | * @irq_data: per irq and chip data passed down to chip functions |
16 | * @timer_rand_state: pointer to timer rand state struct |
17 | * @kstat_irqs: irq stats per cpu |
18 | * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()] |
19 | * @action: the irq action chain |
20 | * @status: status information |
21 | * @depth: disable-depth, for nested irq_disable() calls |
22 | * @wake_depth: enable depth, for multiple set_irq_wake() callers |
23 | * @irq_count: stats field to detect stalled irqs |
24 | * @last_unhandled: aging timer for unhandled count |
25 | * @irqs_unhandled: stats field for spurious unhandled interrupts |
26 | * @lock: locking for SMP |
27 | * @pending_mask: pending rebalanced interrupts |
28 | * @threads_active: number of irqaction threads currently running |
29 | * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers |
30 | * @dir: /proc/irq/ procfs entry |
31 | * @name: flow handler name for /proc/interrupts output |
32 | */ |
33 | struct irq_desc { |
34 | |
35 | #ifdef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED |
36 | struct irq_data irq_data; |
37 | #else |
38 | /* |
39 | * This union will go away, once we fixed the direct access to |
40 | * irq_desc all over the place. The direct fields are a 1:1 |
41 | * overlay of irq_data. |
42 | */ |
43 | union { |
44 | struct irq_data irq_data; |
45 | struct { |
46 | unsigned int irq; |
47 | unsigned int node; |
48 | struct irq_chip *chip; |
49 | void *handler_data; |
50 | void *chip_data; |
51 | struct msi_desc *msi_desc; |
52 | #ifdef CONFIG_SMP |
53 | cpumask_var_t affinity; |
54 | #endif |
55 | }; |
56 | }; |
57 | #endif |
58 | |
59 | struct timer_rand_state *timer_rand_state; |
60 | unsigned int *kstat_irqs; |
61 | irq_flow_handler_t handle_irq; |
62 | struct irqaction *action; /* IRQ action list */ |
63 | unsigned int status; /* IRQ status */ |
64 | |
65 | unsigned int depth; /* nested irq disables */ |
66 | unsigned int wake_depth; /* nested wake enables */ |
67 | unsigned int irq_count; /* For detecting broken IRQs */ |
68 | unsigned long last_unhandled; /* Aging timer for unhandled count */ |
69 | unsigned int irqs_unhandled; |
70 | raw_spinlock_t lock; |
71 | #ifdef CONFIG_SMP |
72 | const struct cpumask *affinity_hint; |
73 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
74 | cpumask_var_t pending_mask; |
75 | #endif |
76 | #endif |
77 | atomic_t threads_active; |
78 | wait_queue_head_t wait_for_threads; |
79 | #ifdef CONFIG_PROC_FS |
80 | struct proc_dir_entry *dir; |
81 | #endif |
82 | const char *name; |
83 | } ____cacheline_internodealigned_in_smp; |
84 | |
85 | #ifndef CONFIG_SPARSE_IRQ |
86 | extern struct irq_desc irq_desc[NR_IRQS]; |
87 | #endif |
88 | |
89 | /* Will be removed once the last users in power and sh are gone */ |
90 | extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node); |
91 | static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node) |
92 | { |
93 | return desc; |
94 | } |
95 | |
96 | #ifdef CONFIG_GENERIC_HARDIRQS |
97 | |
98 | #define get_irq_desc_chip(desc) ((desc)->irq_data.chip) |
99 | #define get_irq_desc_chip_data(desc) ((desc)->irq_data.chip_data) |
100 | #define get_irq_desc_data(desc) ((desc)->irq_data.handler_data) |
101 | #define get_irq_desc_msi(desc) ((desc)->irq_data.msi_desc) |
102 | |
103 | /* |
104 | * Monolithic do_IRQ implementation. |
105 | */ |
106 | #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ |
107 | extern unsigned int __do_IRQ(unsigned int irq); |
108 | #endif |
109 | |
110 | /* |
111 | * Architectures call this to let the generic IRQ layer |
112 | * handle an interrupt. If the descriptor is attached to an |
113 | * irqchip-style controller then we call the ->handle_irq() handler, |
114 | * and it calls __do_IRQ() if it's attached to an irqtype-style controller. |
115 | */ |
116 | static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc) |
117 | { |
118 | #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ |
119 | desc->handle_irq(irq, desc); |
120 | #else |
121 | if (likely(desc->handle_irq)) |
122 | desc->handle_irq(irq, desc); |
123 | else |
124 | __do_IRQ(irq); |
125 | #endif |
126 | } |
127 | |
128 | static inline void generic_handle_irq(unsigned int irq) |
129 | { |
130 | generic_handle_irq_desc(irq, irq_to_desc(irq)); |
131 | } |
132 | |
133 | /* Test to see if a driver has successfully requested an irq */ |
134 | static inline int irq_has_action(unsigned int irq) |
135 | { |
136 | struct irq_desc *desc = irq_to_desc(irq); |
137 | return desc->action != NULL; |
138 | } |
139 | |
140 | static inline int irq_balancing_disabled(unsigned int irq) |
141 | { |
142 | struct irq_desc *desc; |
143 | |
144 | desc = irq_to_desc(irq); |
145 | return desc->status & IRQ_NO_BALANCING_MASK; |
146 | } |
147 | |
148 | /* caller has locked the irq_desc and both params are valid */ |
149 | static inline void __set_irq_handler_unlocked(int irq, |
150 | irq_flow_handler_t handler) |
151 | { |
152 | struct irq_desc *desc; |
153 | |
154 | desc = irq_to_desc(irq); |
155 | desc->handle_irq = handler; |
156 | } |
157 | #endif |
158 | |
159 | #endif |
160 |
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