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