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e144710b TG |
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 | ||
cd7eab44 | 11 | struct irq_affinity_notify; |
e144710b | 12 | struct proc_dir_entry; |
ec53cf23 | 13 | struct module; |
293a7a0a TG |
14 | struct irq_desc; |
15 | ||
e144710b TG |
16 | /** |
17 | * struct irq_desc - interrupt descriptor | |
18 | * @irq_data: per irq and chip data passed down to chip functions | |
e144710b | 19 | * @kstat_irqs: irq stats per cpu |
77076778 GU |
20 | * @handle_irq: highlevel irq-events handler |
21 | * @preflow_handler: handler called before the flow handler (currently used by sparc) | |
e144710b TG |
22 | * @action: the irq action chain |
23 | * @status: status information | |
dbec07ba | 24 | * @core_internal_state__do_not_mess_with_it: core internal status information |
e144710b | 25 | * @depth: disable-depth, for nested irq_disable() calls |
0911f124 | 26 | * @wake_depth: enable depth, for multiple irq_set_irq_wake() callers |
e144710b TG |
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 | |
1e77d0a1 TG |
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 | |
e144710b | 32 | * @lock: locking for SMP |
77076778 | 33 | * @affinity_hint: hint to user space for preferred irq affinity |
cd7eab44 | 34 | * @affinity_notify: context for notification of affinity changes |
e144710b | 35 | * @pending_mask: pending rebalanced interrupts |
b5faba21 | 36 | * @threads_oneshot: bitfield to handle shared oneshot threads |
e144710b TG |
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 { | |
e144710b | 43 | struct irq_data irq_data; |
6c9ae009 | 44 | unsigned int __percpu *kstat_irqs; |
e144710b | 45 | irq_flow_handler_t handle_irq; |
78129576 TG |
46 | #ifdef CONFIG_IRQ_PREFLOW_FASTEOI |
47 | irq_preflow_handler_t preflow_handler; | |
48 | #endif | |
e144710b | 49 | struct irqaction *action; /* IRQ action list */ |
a6967caf | 50 | unsigned int status_use_accessors; |
dbec07ba | 51 | unsigned int core_internal_state__do_not_mess_with_it; |
e144710b TG |
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; | |
1e77d0a1 TG |
57 | atomic_t threads_handled; |
58 | int threads_handled_last; | |
e144710b | 59 | raw_spinlock_t lock; |
31d9d9b6 | 60 | struct cpumask *percpu_enabled; |
e144710b TG |
61 | #ifdef CONFIG_SMP |
62 | const struct cpumask *affinity_hint; | |
cd7eab44 | 63 | struct irq_affinity_notify *affinity_notify; |
e144710b TG |
64 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
65 | cpumask_var_t pending_mask; | |
66 | #endif | |
67 | #endif | |
b5faba21 | 68 | unsigned long threads_oneshot; |
e144710b TG |
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 | |
293a7a0a | 74 | int parent_irq; |
b6873807 | 75 | struct module *owner; |
e144710b TG |
76 | const char *name; |
77 | } ____cacheline_internodealigned_in_smp; | |
78 | ||
e144710b TG |
79 | #ifndef CONFIG_SPARSE_IRQ |
80 | extern struct irq_desc irq_desc[NR_IRQS]; | |
81 | #endif | |
82 | ||
d9936bb3 TG |
83 | static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc) |
84 | { | |
85 | return &desc->irq_data; | |
86 | } | |
87 | ||
a0cd9ca2 TG |
88 | static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc) |
89 | { | |
90 | return desc->irq_data.chip; | |
91 | } | |
92 | ||
93 | static inline void *irq_desc_get_chip_data(struct irq_desc *desc) | |
94 | { | |
95 | return desc->irq_data.chip_data; | |
96 | } | |
97 | ||
98 | static inline void *irq_desc_get_handler_data(struct irq_desc *desc) | |
99 | { | |
100 | return desc->irq_data.handler_data; | |
101 | } | |
102 | ||
103 | static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc) | |
104 | { | |
105 | return desc->irq_data.msi_desc; | |
106 | } | |
107 | ||
e144710b TG |
108 | /* |
109 | * Architectures call this to let the generic IRQ layer | |
110 | * handle an interrupt. If the descriptor is attached to an | |
111 | * irqchip-style controller then we call the ->handle_irq() handler, | |
112 | * and it calls __do_IRQ() if it's attached to an irqtype-style controller. | |
113 | */ | |
114 | static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc) | |
115 | { | |
e144710b | 116 | desc->handle_irq(irq, desc); |
e144710b TG |
117 | } |
118 | ||
fe12bc2c | 119 | int generic_handle_irq(unsigned int irq); |
e144710b TG |
120 | |
121 | /* Test to see if a driver has successfully requested an irq */ | |
122 | static inline int irq_has_action(unsigned int irq) | |
123 | { | |
124 | struct irq_desc *desc = irq_to_desc(irq); | |
125 | return desc->action != NULL; | |
126 | } | |
127 | ||
a2e8461a TG |
128 | /* caller has locked the irq_desc and both params are valid */ |
129 | static inline void __irq_set_handler_locked(unsigned int irq, | |
130 | irq_flow_handler_t handler) | |
e144710b TG |
131 | { |
132 | struct irq_desc *desc; | |
133 | ||
134 | desc = irq_to_desc(irq); | |
a2e8461a | 135 | desc->handle_irq = handler; |
e144710b TG |
136 | } |
137 | ||
138 | /* caller has locked the irq_desc and both params are valid */ | |
a2e8461a TG |
139 | static inline void |
140 | __irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip, | |
141 | irq_flow_handler_t handler, const char *name) | |
142 | { | |
143 | struct irq_desc *desc; | |
144 | ||
145 | desc = irq_to_desc(irq); | |
146 | irq_desc_get_irq_data(desc)->chip = chip; | |
147 | desc->handle_irq = handler; | |
148 | desc->name = name; | |
149 | } | |
150 | ||
a2e8461a | 151 | static inline int irq_balancing_disabled(unsigned int irq) |
e144710b TG |
152 | { |
153 | struct irq_desc *desc; | |
154 | ||
155 | desc = irq_to_desc(irq); | |
0c6f8a8b | 156 | return desc->status_use_accessors & IRQ_NO_BALANCING_MASK; |
e144710b | 157 | } |
78129576 | 158 | |
7f4a8e7b VK |
159 | static inline int irq_is_percpu(unsigned int irq) |
160 | { | |
161 | struct irq_desc *desc; | |
162 | ||
163 | desc = irq_to_desc(irq); | |
164 | return desc->status_use_accessors & IRQ_PER_CPU; | |
165 | } | |
166 | ||
d3e17deb TG |
167 | static inline void |
168 | irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class) | |
169 | { | |
170 | struct irq_desc *desc = irq_to_desc(irq); | |
171 | ||
172 | if (desc) | |
173 | lockdep_set_class(&desc->lock, class); | |
174 | } | |
175 | ||
78129576 TG |
176 | #ifdef CONFIG_IRQ_PREFLOW_FASTEOI |
177 | static inline void | |
178 | __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler) | |
179 | { | |
180 | struct irq_desc *desc; | |
181 | ||
182 | desc = irq_to_desc(irq); | |
183 | desc->preflow_handler = handler; | |
184 | } | |
185 | #endif | |
e144710b TG |
186 | |
187 | #endif |