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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 #include <linux/kernel_stat.h>
10 
11 #ifdef CONFIG_SPARSE_IRQ
12 # define IRQ_BITMAP_BITS	(NR_IRQS + 8196)
13 #else
14 # define IRQ_BITMAP_BITS	NR_IRQS
15 #endif
16 
17 #define istate core_internal_state__do_not_mess_with_it
18 
19 extern bool noirqdebug;
20 
21 extern struct irqaction chained_action;
22 
23 /*
24  * Bits used by threaded handlers:
25  * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
26  * IRQTF_WARNED    - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
27  * IRQTF_AFFINITY  - irq thread is requested to adjust affinity
28  * IRQTF_FORCED_THREAD  - irq action is force threaded
29  */
30 enum {
31 	IRQTF_RUNTHREAD,
32 	IRQTF_WARNED,
33 	IRQTF_AFFINITY,
34 	IRQTF_FORCED_THREAD,
35 };
36 
37 /*
38  * Bit masks for desc->core_internal_state__do_not_mess_with_it
39  *
40  * IRQS_AUTODETECT		- autodetection in progress
41  * IRQS_SPURIOUS_DISABLED	- was disabled due to spurious interrupt
42  *				  detection
43  * IRQS_POLL_INPROGRESS		- polling in progress
44  * IRQS_ONESHOT			- irq is not unmasked in primary handler
45  * IRQS_REPLAY			- irq is replayed
46  * IRQS_WAITING			- irq is waiting
47  * IRQS_PENDING			- irq is pending and replayed later
48  * IRQS_SUSPENDED		- irq is suspended
49  */
50 enum {
51 	IRQS_AUTODETECT		= 0x00000001,
52 	IRQS_SPURIOUS_DISABLED	= 0x00000002,
53 	IRQS_POLL_INPROGRESS	= 0x00000008,
54 	IRQS_ONESHOT		= 0x00000020,
55 	IRQS_REPLAY		= 0x00000040,
56 	IRQS_WAITING		= 0x00000080,
57 	IRQS_PENDING		= 0x00000200,
58 	IRQS_SUSPENDED		= 0x00000800,
59 };
60 
61 #include "debug.h"
62 #include "settings.h"
63 
64 extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
65 extern void __disable_irq(struct irq_desc *desc);
66 extern void __enable_irq(struct irq_desc *desc);
67 
68 extern int irq_startup(struct irq_desc *desc, bool resend);
69 extern void irq_shutdown(struct irq_desc *desc);
70 extern void irq_enable(struct irq_desc *desc);
71 extern void irq_disable(struct irq_desc *desc);
72 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
73 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
74 extern void mask_irq(struct irq_desc *desc);
75 extern void unmask_irq(struct irq_desc *desc);
76 extern void unmask_threaded_irq(struct irq_desc *desc);
77 
78 #ifdef CONFIG_SPARSE_IRQ
irq_mark_irq(unsigned int irq)79 static inline void irq_mark_irq(unsigned int irq) { }
80 #else
81 extern void irq_mark_irq(unsigned int irq);
82 #endif
83 
84 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
85 
86 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc);
87 irqreturn_t handle_irq_event(struct irq_desc *desc);
88 
89 /* Resending of interrupts :*/
90 void check_irq_resend(struct irq_desc *desc);
91 bool irq_wait_for_poll(struct irq_desc *desc);
92 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
93 
94 #ifdef CONFIG_PROC_FS
95 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
96 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
97 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
98 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
99 #else
register_irq_proc(unsigned int irq,struct irq_desc * desc)100 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
unregister_irq_proc(unsigned int irq,struct irq_desc * desc)101 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
register_handler_proc(unsigned int irq,struct irqaction * action)102 static inline void register_handler_proc(unsigned int irq,
103 					 struct irqaction *action) { }
unregister_handler_proc(unsigned int irq,struct irqaction * action)104 static inline void unregister_handler_proc(unsigned int irq,
105 					   struct irqaction *action) { }
106 #endif
107 
108 extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
109 
110 extern void irq_set_thread_affinity(struct irq_desc *desc);
111 
112 extern int irq_do_set_affinity(struct irq_data *data,
113 			       const struct cpumask *dest, bool force);
114 
115 /* Inline functions for support of irq chips on slow busses */
chip_bus_lock(struct irq_desc * desc)116 static inline void chip_bus_lock(struct irq_desc *desc)
117 {
118 	if (unlikely(desc->irq_data.chip->irq_bus_lock))
119 		desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
120 }
121 
chip_bus_sync_unlock(struct irq_desc * desc)122 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
123 {
124 	if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
125 		desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
126 }
127 
128 #define _IRQ_DESC_CHECK		(1 << 0)
129 #define _IRQ_DESC_PERCPU	(1 << 1)
130 
131 #define IRQ_GET_DESC_CHECK_GLOBAL	(_IRQ_DESC_CHECK)
132 #define IRQ_GET_DESC_CHECK_PERCPU	(_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
133 
134 struct irq_desc *
135 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
136 		    unsigned int check);
137 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
138 
139 static inline struct irq_desc *
irq_get_desc_buslock(unsigned int irq,unsigned long * flags,unsigned int check)140 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
141 {
142 	return __irq_get_desc_lock(irq, flags, true, check);
143 }
144 
145 static inline void
irq_put_desc_busunlock(struct irq_desc * desc,unsigned long flags)146 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
147 {
148 	__irq_put_desc_unlock(desc, flags, true);
149 }
150 
151 static inline struct irq_desc *
irq_get_desc_lock(unsigned int irq,unsigned long * flags,unsigned int check)152 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
153 {
154 	return __irq_get_desc_lock(irq, flags, false, check);
155 }
156 
157 static inline void
irq_put_desc_unlock(struct irq_desc * desc,unsigned long flags)158 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
159 {
160 	__irq_put_desc_unlock(desc, flags, false);
161 }
162 
163 /*
164  * Manipulation functions for irq_data.state
165  */
irqd_set_move_pending(struct irq_data * d)166 static inline void irqd_set_move_pending(struct irq_data *d)
167 {
168 	__irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
169 }
170 
irqd_clr_move_pending(struct irq_data * d)171 static inline void irqd_clr_move_pending(struct irq_data *d)
172 {
173 	__irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
174 }
175 
irqd_clear(struct irq_data * d,unsigned int mask)176 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
177 {
178 	__irqd_to_state(d) &= ~mask;
179 }
180 
irqd_set(struct irq_data * d,unsigned int mask)181 static inline void irqd_set(struct irq_data *d, unsigned int mask)
182 {
183 	__irqd_to_state(d) |= mask;
184 }
185 
irqd_has_set(struct irq_data * d,unsigned int mask)186 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
187 {
188 	return __irqd_to_state(d) & mask;
189 }
190 
kstat_incr_irqs_this_cpu(struct irq_desc * desc)191 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
192 {
193 	__this_cpu_inc(*desc->kstat_irqs);
194 	__this_cpu_inc(kstat.irqs_sum);
195 }
196 
irq_desc_get_node(struct irq_desc * desc)197 static inline int irq_desc_get_node(struct irq_desc *desc)
198 {
199 	return irq_common_data_get_node(&desc->irq_common_data);
200 }
201 
irq_desc_is_chained(struct irq_desc * desc)202 static inline int irq_desc_is_chained(struct irq_desc *desc)
203 {
204 	return (desc->action && desc->action == &chained_action);
205 }
206 
207 #ifdef CONFIG_PM_SLEEP
208 bool irq_pm_check_wakeup(struct irq_desc *desc);
209 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
210 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
211 #else
irq_pm_check_wakeup(struct irq_desc * desc)212 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
213 static inline void
irq_pm_install_action(struct irq_desc * desc,struct irqaction * action)214 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
215 static inline void
irq_pm_remove_action(struct irq_desc * desc,struct irqaction * action)216 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
217 #endif
218