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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 | struct irq_2_iommu; | |
14 | /** | |
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 | |
22 | * @depth: disable-depth, for nested irq_disable() calls | |
23 | * @wake_depth: enable depth, for multiple set_irq_wake() callers | |
24 | * @irq_count: stats field to detect stalled irqs | |
25 | * @last_unhandled: aging timer for unhandled count | |
26 | * @irqs_unhandled: stats field for spurious unhandled interrupts | |
27 | * @lock: locking for SMP | |
28 | * @pending_mask: pending rebalanced interrupts | |
29 | * @threads_active: number of irqaction threads currently running | |
30 | * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers | |
31 | * @dir: /proc/irq/ procfs entry | |
32 | * @name: flow handler name for /proc/interrupts output | |
33 | */ | |
34 | struct irq_desc { | |
35 | ||
36 | #ifdef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED | |
37 | struct irq_data irq_data; | |
38 | #else | |
39 | /* | |
40 | * This union will go away, once we fixed the direct access to | |
41 | * irq_desc all over the place. The direct fields are a 1:1 | |
42 | * overlay of irq_data. | |
43 | */ | |
44 | union { | |
45 | struct irq_data irq_data; | |
46 | struct { | |
47 | unsigned int irq; | |
48 | unsigned int node; | |
49 | struct irq_chip *chip; | |
50 | void *handler_data; | |
51 | void *chip_data; | |
52 | struct msi_desc *msi_desc; | |
53 | #ifdef CONFIG_SMP | |
54 | cpumask_var_t affinity; | |
55 | #endif | |
56 | #ifdef CONFIG_INTR_REMAP | |
57 | struct irq_2_iommu *irq_2_iommu; | |
58 | #endif | |
59 | }; | |
60 | }; | |
61 | #endif | |
62 | ||
63 | struct timer_rand_state *timer_rand_state; | |
64 | unsigned int *kstat_irqs; | |
65 | irq_flow_handler_t handle_irq; | |
66 | struct irqaction *action; /* IRQ action list */ | |
67 | unsigned int status; /* IRQ status */ | |
68 | ||
69 | unsigned int depth; /* nested irq disables */ | |
70 | unsigned int wake_depth; /* nested wake enables */ | |
71 | unsigned int irq_count; /* For detecting broken IRQs */ | |
72 | unsigned long last_unhandled; /* Aging timer for unhandled count */ | |
73 | unsigned int irqs_unhandled; | |
74 | raw_spinlock_t lock; | |
75 | #ifdef CONFIG_SMP | |
76 | const struct cpumask *affinity_hint; | |
77 | #ifdef CONFIG_GENERIC_PENDING_IRQ | |
78 | cpumask_var_t pending_mask; | |
79 | #endif | |
80 | #endif | |
81 | atomic_t threads_active; | |
82 | wait_queue_head_t wait_for_threads; | |
83 | #ifdef CONFIG_PROC_FS | |
84 | struct proc_dir_entry *dir; | |
85 | #endif | |
86 | const char *name; | |
87 | } ____cacheline_internodealigned_in_smp; | |
88 | ||
89 | extern void arch_init_copy_chip_data(struct irq_desc *old_desc, | |
90 | struct irq_desc *desc, int node); | |
91 | extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc); | |
92 | ||
93 | #ifndef CONFIG_SPARSE_IRQ | |
94 | extern struct irq_desc irq_desc[NR_IRQS]; | |
95 | #endif | |
96 | ||
97 | #ifdef CONFIG_NUMA_IRQ_DESC | |
98 | extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node); | |
99 | #else | |
100 | static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node) | |
101 | { | |
102 | return desc; | |
103 | } | |
104 | #endif | |
105 | ||
106 | extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node); | |
107 | ||
108 | #ifdef CONFIG_GENERIC_HARDIRQS | |
109 | ||
110 | #define get_irq_desc_chip(desc) ((desc)->irq_data.chip) | |
111 | #define get_irq_desc_chip_data(desc) ((desc)->irq_data.chip_data) | |
112 | #define get_irq_desc_data(desc) ((desc)->irq_data.handler_data) | |
113 | #define get_irq_desc_msi(desc) ((desc)->irq_data.msi_desc) | |
114 | ||
115 | /* | |
116 | * Monolithic do_IRQ implementation. | |
117 | */ | |
118 | #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ | |
119 | extern unsigned int __do_IRQ(unsigned int irq); | |
120 | #endif | |
121 | ||
122 | /* | |
123 | * Architectures call this to let the generic IRQ layer | |
124 | * handle an interrupt. If the descriptor is attached to an | |
125 | * irqchip-style controller then we call the ->handle_irq() handler, | |
126 | * and it calls __do_IRQ() if it's attached to an irqtype-style controller. | |
127 | */ | |
128 | static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc) | |
129 | { | |
130 | #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ | |
131 | desc->handle_irq(irq, desc); | |
132 | #else | |
133 | if (likely(desc->handle_irq)) | |
134 | desc->handle_irq(irq, desc); | |
135 | else | |
136 | __do_IRQ(irq); | |
137 | #endif | |
138 | } | |
139 | ||
140 | static inline void generic_handle_irq(unsigned int irq) | |
141 | { | |
142 | generic_handle_irq_desc(irq, irq_to_desc(irq)); | |
143 | } | |
144 | ||
145 | /* Test to see if a driver has successfully requested an irq */ | |
146 | static inline int irq_has_action(unsigned int irq) | |
147 | { | |
148 | struct irq_desc *desc = irq_to_desc(irq); | |
149 | return desc->action != NULL; | |
150 | } | |
151 | ||
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 & IRQ_NO_BALANCING_MASK; | |
158 | } | |
159 | ||
160 | /* caller has locked the irq_desc and both params are valid */ | |
161 | static inline void __set_irq_handler_unlocked(int irq, | |
162 | irq_flow_handler_t handler) | |
163 | { | |
164 | struct irq_desc *desc; | |
165 | ||
166 | desc = irq_to_desc(irq); | |
167 | desc->handle_irq = handler; | |
168 | } | |
169 | #endif | |
170 | ||
171 | #endif |