1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * include/linux/irqflags.h
4 *
5 * IRQ flags tracing: follow the state of the hardirq and softirq flags and
6 * provide callbacks for transitions between ON and OFF states.
7 *
8 * This file gets included from lowlevel asm headers too, to provide
9 * wrapped versions of the local_irq_*() APIs, based on the
10 * raw_local_irq_*() macros from the lowlevel headers.
11 */
12#ifndef _LINUX_TRACE_IRQFLAGS_H
13#define _LINUX_TRACE_IRQFLAGS_H
14
15#include <linux/typecheck.h>
16#include <asm/irqflags.h>
17
18/* Currently trace_softirqs_on/off is used only by lockdep */
19#ifdef CONFIG_PROVE_LOCKING
20 extern void trace_softirqs_on(unsigned long ip);
21 extern void trace_softirqs_off(unsigned long ip);
22 extern void lockdep_hardirqs_on(unsigned long ip);
23 extern void lockdep_hardirqs_off(unsigned long ip);
24#else
25 static inline void trace_softirqs_on(unsigned long ip) { }
26 static inline void trace_softirqs_off(unsigned long ip) { }
27 static inline void lockdep_hardirqs_on(unsigned long ip) { }
28 static inline void lockdep_hardirqs_off(unsigned long ip) { }
29#endif
30
31#ifdef CONFIG_TRACE_IRQFLAGS
32 extern void trace_hardirqs_on(void);
33 extern void trace_hardirqs_off(void);
34# define trace_hardirq_context(p) ((p)->hardirq_context)
35# define trace_softirq_context(p) ((p)->softirq_context)
36# define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled)
37# define trace_softirqs_enabled(p) ((p)->softirqs_enabled)
38# define trace_hardirq_enter() \
39do { \
40 current->hardirq_context++; \
41} while (0)
42# define trace_hardirq_exit() \
43do { \
44 current->hardirq_context--; \
45} while (0)
46# define lockdep_softirq_enter() \
47do { \
48 current->softirq_context++; \
49} while (0)
50# define lockdep_softirq_exit() \
51do { \
52 current->softirq_context--; \
53} while (0)
54#else
55# define trace_hardirqs_on() do { } while (0)
56# define trace_hardirqs_off() do { } while (0)
57# define trace_hardirq_context(p) 0
58# define trace_softirq_context(p) 0
59# define trace_hardirqs_enabled(p) 0
60# define trace_softirqs_enabled(p) 0
61# define trace_hardirq_enter() do { } while (0)
62# define trace_hardirq_exit() do { } while (0)
63# define lockdep_softirq_enter() do { } while (0)
64# define lockdep_softirq_exit() do { } while (0)
65#endif
66
67#if defined(CONFIG_IRQSOFF_TRACER) || \
68 defined(CONFIG_PREEMPT_TRACER)
69 extern void stop_critical_timings(void);
70 extern void start_critical_timings(void);
71#else
72# define stop_critical_timings() do { } while (0)
73# define start_critical_timings() do { } while (0)
74#endif
75
76/*
77 * Wrap the arch provided IRQ routines to provide appropriate checks.
78 */
79#define raw_local_irq_disable() arch_local_irq_disable()
80#define raw_local_irq_enable() arch_local_irq_enable()
81#define raw_local_irq_save(flags) \
82 do { \
83 typecheck(unsigned long, flags); \
84 flags = arch_local_irq_save(); \
85 } while (0)
86#define raw_local_irq_restore(flags) \
87 do { \
88 typecheck(unsigned long, flags); \
89 arch_local_irq_restore(flags); \
90 } while (0)
91#define raw_local_save_flags(flags) \
92 do { \
93 typecheck(unsigned long, flags); \
94 flags = arch_local_save_flags(); \
95 } while (0)
96#define raw_irqs_disabled_flags(flags) \
97 ({ \
98 typecheck(unsigned long, flags); \
99 arch_irqs_disabled_flags(flags); \
100 })
101#define raw_irqs_disabled() (arch_irqs_disabled())
102#define raw_safe_halt() arch_safe_halt()
103
104/*
105 * The local_irq_*() APIs are equal to the raw_local_irq*()
106 * if !TRACE_IRQFLAGS.
107 */
108#ifdef CONFIG_TRACE_IRQFLAGS
109#define local_irq_enable() \
110 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
111#define local_irq_disable() \
112 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
113#define local_irq_save(flags) \
114 do { \
115 raw_local_irq_save(flags); \
116 trace_hardirqs_off(); \
117 } while (0)
118
119
120#define local_irq_restore(flags) \
121 do { \
122 if (raw_irqs_disabled_flags(flags)) { \
123 raw_local_irq_restore(flags); \
124 trace_hardirqs_off(); \
125 } else { \
126 trace_hardirqs_on(); \
127 raw_local_irq_restore(flags); \
128 } \
129 } while (0)
130
131#define safe_halt() \
132 do { \
133 trace_hardirqs_on(); \
134 raw_safe_halt(); \
135 } while (0)
136
137
138#else /* !CONFIG_TRACE_IRQFLAGS */
139
140#define local_irq_enable() do { raw_local_irq_enable(); } while (0)
141#define local_irq_disable() do { raw_local_irq_disable(); } while (0)
142#define local_irq_save(flags) \
143 do { \
144 raw_local_irq_save(flags); \
145 } while (0)
146#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
147#define safe_halt() do { raw_safe_halt(); } while (0)
148
149#endif /* CONFIG_TRACE_IRQFLAGS */
150
151#define local_save_flags(flags) raw_local_save_flags(flags)
152
153/*
154 * Some architectures don't define arch_irqs_disabled(), so even if either
155 * definition would be fine we need to use different ones for the time being
156 * to avoid build issues.
157 */
158#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
159#define irqs_disabled() \
160 ({ \
161 unsigned long _flags; \
162 raw_local_save_flags(_flags); \
163 raw_irqs_disabled_flags(_flags); \
164 })
165#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
166#define irqs_disabled() raw_irqs_disabled()
167#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
168
169#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
170
171#endif
172