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#ifdef CONFIG_TRACE_IRQFLAGS
15  extern void trace_hardirqs_on(void);
16  extern void trace_hardirqs_off(void);
17  extern void trace_softirqs_on(unsigned long ip);
18  extern void trace_softirqs_off(unsigned long ip);
19# define trace_hardirq_context(p)	((p)->hardirq_context)
20# define trace_softirq_context(p)	((p)->softirq_context)
21# define trace_hardirqs_enabled(p)	((p)->hardirqs_enabled)
22# define trace_softirqs_enabled(p)	((p)->softirqs_enabled)
23# define trace_hardirq_enter()	do { current->hardirq_context++; } while (0)
24# define trace_hardirq_exit()	do { current->hardirq_context--; } while (0)
25# define trace_softirq_enter()	do { current->softirq_context++; } while (0)
26# define trace_softirq_exit()	do { current->softirq_context--; } while (0)
27# define INIT_TRACE_IRQFLAGS	.softirqs_enabled = 1,
28#else
29# define trace_hardirqs_on()		do { } while (0)
30# define trace_hardirqs_off()		do { } while (0)
31# define trace_softirqs_on(ip)		do { } while (0)
32# define trace_softirqs_off(ip)		do { } while (0)
33# define trace_hardirq_context(p)	0
34# define trace_softirq_context(p)	0
35# define trace_hardirqs_enabled(p)	0
36# define trace_softirqs_enabled(p)	0
37# define trace_hardirq_enter()		do { } while (0)
38# define trace_hardirq_exit()		do { } while (0)
39# define trace_softirq_enter()		do { } while (0)
40# define trace_softirq_exit()		do { } while (0)
41# define INIT_TRACE_IRQFLAGS
42#endif
43
44#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
45
46#include <asm/irqflags.h>
47
48#define local_irq_enable() \
49	do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
50#define local_irq_disable() \
51	do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
52#define local_irq_save(flags) \
53	do { raw_local_irq_save(flags); trace_hardirqs_off(); } while (0)
54
55#define local_irq_restore(flags)				\
56	do {							\
57		if (raw_irqs_disabled_flags(flags)) {		\
58			raw_local_irq_restore(flags);		\
59			trace_hardirqs_off();			\
60		} else {					\
61			trace_hardirqs_on();			\
62			raw_local_irq_restore(flags);		\
63		}						\
64	} while (0)
65#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
66/*
67 * The local_irq_*() APIs are equal to the raw_local_irq*()
68 * if !TRACE_IRQFLAGS.
69 */
70# define raw_local_irq_disable()	local_irq_disable()
71# define raw_local_irq_enable()		local_irq_enable()
72# define raw_local_irq_save(flags)	local_irq_save(flags)
73# define raw_local_irq_restore(flags)	local_irq_restore(flags)
74#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
75
76#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
77#define safe_halt()						\
78	do {							\
79		trace_hardirqs_on();				\
80		raw_safe_halt();				\
81	} while (0)
82
83#define local_save_flags(flags)		raw_local_save_flags(flags)
84
85#define irqs_disabled()						\
86({								\
87	unsigned long flags;					\
88								\
89	raw_local_save_flags(flags);				\
90	raw_irqs_disabled_flags(flags);				\
91})
92
93#define irqs_disabled_flags(flags)	raw_irqs_disabled_flags(flags)
94#endif		/* CONFIG_X86 */
95
96#endif
97