1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef LINUX_HARDIRQ_H
3 #define LINUX_HARDIRQ_H
4
5 #include <linux/preempt.h>
6 #include <linux/lockdep.h>
7 #include <linux/ftrace_irq.h>
8 #include <linux/vtime.h>
9 #include <asm/hardirq.h>
10
11
12 extern void synchronize_irq(unsigned int irq);
13 extern bool synchronize_hardirq(unsigned int irq);
14
15 #if defined(CONFIG_TINY_RCU)
16
17 static inline void rcu_nmi_enter(void)
18 {
19 }
20
21 static inline void rcu_nmi_exit(void)
22 {
23 }
24
25 #else
26 extern void rcu_nmi_enter(void);
27 extern void rcu_nmi_exit(void);
28 #endif
29
30 /*
31 * It is safe to do non-atomic ops on ->hardirq_context,
32 * because NMI handlers may not preempt and the ops are
33 * always balanced, so the interrupted value of ->hardirq_context
34 * will always be restored.
35 */
36 #define __irq_enter() \
37 do { \
38 account_irq_enter_time(current); \
39 preempt_count_add(HARDIRQ_OFFSET); \
40 trace_hardirq_enter(); \
41 } while (0)
42
43 /*
44 * Enter irq context (on NO_HZ, update jiffies):
45 */
46 extern void irq_enter(void);
47
48 /*
49 * Exit irq context without processing softirqs:
50 */
51 #define __irq_exit() \
52 do { \
53 trace_hardirq_exit(); \
54 account_irq_exit_time(current); \
55 preempt_count_sub(HARDIRQ_OFFSET); \
56 } while (0)
57
58 /*
59 * Exit irq context and process softirqs if needed:
60 */
61 extern void irq_exit(void);
62
63 #ifndef arch_nmi_enter
64 #define arch_nmi_enter() do { } while (0)
65 #define arch_nmi_exit() do { } while (0)
66 #endif
67
68 #define nmi_enter() \
69 do { \
70 arch_nmi_enter(); \
71 printk_nmi_enter(); \
72 lockdep_off(); \
73 ftrace_nmi_enter(); \
74 BUG_ON(in_nmi()); \
75 preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET); \
76 rcu_nmi_enter(); \
77 trace_hardirq_enter(); \
78 } while (0)
79
80 #define nmi_exit() \
81 do { \
82 trace_hardirq_exit(); \
83 rcu_nmi_exit(); \
84 BUG_ON(!in_nmi()); \
85 preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET); \
86 ftrace_nmi_exit(); \
87 lockdep_on(); \
88 printk_nmi_exit(); \
89 arch_nmi_exit(); \
90 } while (0)
91
92 #endif /* LINUX_HARDIRQ_H */