Merge branch 'topic/hda-ca0132-dsp' into for-next
[platform/adaptation/renesas_rcar/renesas_kernel.git] / include / linux / irqdesc.h
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 module;
14 struct irq_desc;
15
16 /**
17  * struct irq_desc - interrupt descriptor
18  * @irq_data:           per irq and chip data passed down to chip functions
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         int                     parent_irq;
71         struct module           *owner;
72         const char              *name;
73 } ____cacheline_internodealigned_in_smp;
74
75 #ifndef CONFIG_SPARSE_IRQ
76 extern struct irq_desc irq_desc[NR_IRQS];
77 #endif
78
79 #ifdef CONFIG_GENERIC_HARDIRQS
80
81 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
82 {
83         return &desc->irq_data;
84 }
85
86 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
87 {
88         return desc->irq_data.chip;
89 }
90
91 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
92 {
93         return desc->irq_data.chip_data;
94 }
95
96 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
97 {
98         return desc->irq_data.handler_data;
99 }
100
101 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
102 {
103         return desc->irq_data.msi_desc;
104 }
105
106 /*
107  * Architectures call this to let the generic IRQ layer
108  * handle an interrupt. If the descriptor is attached to an
109  * irqchip-style controller then we call the ->handle_irq() handler,
110  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
111  */
112 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
113 {
114         desc->handle_irq(irq, desc);
115 }
116
117 int generic_handle_irq(unsigned int irq);
118
119 /* Test to see if a driver has successfully requested an irq */
120 static inline int irq_has_action(unsigned int irq)
121 {
122         struct irq_desc *desc = irq_to_desc(irq);
123         return desc->action != NULL;
124 }
125
126 /* caller has locked the irq_desc and both params are valid */
127 static inline void __irq_set_handler_locked(unsigned int irq,
128                                             irq_flow_handler_t handler)
129 {
130         struct irq_desc *desc;
131
132         desc = irq_to_desc(irq);
133         desc->handle_irq = handler;
134 }
135
136 /* caller has locked the irq_desc and both params are valid */
137 static inline void
138 __irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
139                                    irq_flow_handler_t handler, const char *name)
140 {
141         struct irq_desc *desc;
142
143         desc = irq_to_desc(irq);
144         irq_desc_get_irq_data(desc)->chip = chip;
145         desc->handle_irq = handler;
146         desc->name = name;
147 }
148
149 static inline int irq_balancing_disabled(unsigned int irq)
150 {
151         struct irq_desc *desc;
152
153         desc = irq_to_desc(irq);
154         return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
155 }
156
157 static inline void
158 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
159 {
160         struct irq_desc *desc = irq_to_desc(irq);
161
162         if (desc)
163                 lockdep_set_class(&desc->lock, class);
164 }
165
166 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
167 static inline void
168 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
169 {
170         struct irq_desc *desc;
171
172         desc = irq_to_desc(irq);
173         desc->preflow_handler = handler;
174 }
175 #endif
176 #endif
177
178 #endif