1 /*
2 * IRQ subsystem internal functions and variables:
3 *
4 * Do not ever include this file from anything else than
5 * kernel/irq/. Do not even think about using any information outside
6 * of this file for your non core code.
7 */
8 #include <linux/irqdesc.h>
9
10 #ifdef CONFIG_SPARSE_IRQ
11 # define IRQ_BITMAP_BITS (NR_IRQS + 8196)
12 #else
13 # define IRQ_BITMAP_BITS NR_IRQS
14 #endif
15
16 #define istate core_internal_state__do_not_mess_with_it
17
18 extern int noirqdebug;
19
20 /*
21 * Bits used by threaded handlers:
22 * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
23 * IRQTF_DIED - handler thread died
24 * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
25 * IRQTF_AFFINITY - irq thread is requested to adjust affinity
26 * IRQTF_FORCED_THREAD - irq action is force threaded
27 */
28 enum {
29 IRQTF_RUNTHREAD,
30 IRQTF_DIED,
31 IRQTF_WARNED,
32 IRQTF_AFFINITY,
33 IRQTF_FORCED_THREAD,
34 };
35
36 /*
37 * Bit masks for desc->state
38 *
39 * IRQS_AUTODETECT - autodetection in progress
40 * IRQS_SPURIOUS_DISABLED - was disabled due to spurious interrupt
41 * detection
42 * IRQS_POLL_INPROGRESS - polling in progress
43 * IRQS_ONESHOT - irq is not unmasked in primary handler
44 * IRQS_REPLAY - irq is replayed
45 * IRQS_WAITING - irq is waiting
46 * IRQS_PENDING - irq is pending and replayed later
47 * IRQS_SUSPENDED - irq is suspended
48 */
49 enum {
50 IRQS_AUTODETECT = 0x00000001,
51 IRQS_SPURIOUS_DISABLED = 0x00000002,
52 IRQS_POLL_INPROGRESS = 0x00000008,
53 IRQS_ONESHOT = 0x00000020,
54 IRQS_REPLAY = 0x00000040,
55 IRQS_WAITING = 0x00000080,
56 IRQS_PENDING = 0x00000200,
57 IRQS_SUSPENDED = 0x00000800,
58 };
59
60 #include "debug.h"
61 #include "settings.h"
62
63 #define irq_data_to_desc(data) container_of(data, struct irq_desc, irq_data)
64
65 extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
66 unsigned long flags);
67 extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
68 extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
69
70 extern int irq_startup(struct irq_desc *desc);
71 extern void irq_shutdown(struct irq_desc *desc);
72 extern void irq_enable(struct irq_desc *desc);
73 extern void irq_disable(struct irq_desc *desc);
74 extern void mask_irq(struct irq_desc *desc);
75 extern void unmask_irq(struct irq_desc *desc);
76
77 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
78
79 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action);
80 irqreturn_t handle_irq_event(struct irq_desc *desc);
81
82 /* Resending of interrupts :*/
83 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
84 bool irq_wait_for_poll(struct irq_desc *desc);
85
86 #ifdef CONFIG_PROC_FS
87 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
88 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
89 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
90 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
91 #else
register_irq_proc(unsigned int irq,struct irq_desc * desc)92 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
unregister_irq_proc(unsigned int irq,struct irq_desc * desc)93 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
register_handler_proc(unsigned int irq,struct irqaction * action)94 static inline void register_handler_proc(unsigned int irq,
95 struct irqaction *action) { }
unregister_handler_proc(unsigned int irq,struct irqaction * action)96 static inline void unregister_handler_proc(unsigned int irq,
97 struct irqaction *action) { }
98 #endif
99
100 extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
101
102 extern void irq_set_thread_affinity(struct irq_desc *desc);
103
104 /* Inline functions for support of irq chips on slow busses */
chip_bus_lock(struct irq_desc * desc)105 static inline void chip_bus_lock(struct irq_desc *desc)
106 {
107 if (unlikely(desc->irq_data.chip->irq_bus_lock))
108 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
109 }
110
chip_bus_sync_unlock(struct irq_desc * desc)111 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
112 {
113 if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
114 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
115 }
116
117 struct irq_desc *
118 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus);
119 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
120
121 static inline struct irq_desc *
irq_get_desc_buslock(unsigned int irq,unsigned long * flags)122 irq_get_desc_buslock(unsigned int irq, unsigned long *flags)
123 {
124 return __irq_get_desc_lock(irq, flags, true);
125 }
126
127 static inline void
irq_put_desc_busunlock(struct irq_desc * desc,unsigned long flags)128 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
129 {
130 __irq_put_desc_unlock(desc, flags, true);
131 }
132
133 static inline struct irq_desc *
irq_get_desc_lock(unsigned int irq,unsigned long * flags)134 irq_get_desc_lock(unsigned int irq, unsigned long *flags)
135 {
136 return __irq_get_desc_lock(irq, flags, false);
137 }
138
139 static inline void
irq_put_desc_unlock(struct irq_desc * desc,unsigned long flags)140 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
141 {
142 __irq_put_desc_unlock(desc, flags, false);
143 }
144
145 /*
146 * Manipulation functions for irq_data.state
147 */
irqd_set_move_pending(struct irq_data * d)148 static inline void irqd_set_move_pending(struct irq_data *d)
149 {
150 d->state_use_accessors |= IRQD_SETAFFINITY_PENDING;
151 }
152
irqd_clr_move_pending(struct irq_data * d)153 static inline void irqd_clr_move_pending(struct irq_data *d)
154 {
155 d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING;
156 }
157
irqd_clear(struct irq_data * d,unsigned int mask)158 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
159 {
160 d->state_use_accessors &= ~mask;
161 }
162
irqd_set(struct irq_data * d,unsigned int mask)163 static inline void irqd_set(struct irq_data *d, unsigned int mask)
164 {
165 d->state_use_accessors |= mask;
166 }
167
irqd_has_set(struct irq_data * d,unsigned int mask)168 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
169 {
170 return d->state_use_accessors & mask;
171 }
172