tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_softirqs_on(unsigned long ip);
16 extern void trace_softirqs_off(unsigned long ip);
17 extern void trace_hardirqs_on(void);
18 extern void trace_hardirqs_off(void);
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#if defined(CONFIG_IRQSOFF_TRACER) || \
45 defined(CONFIG_PREEMPT_TRACER)
46 extern void stop_critical_timings(void);
47 extern void start_critical_timings(void);
48#else
49# define stop_critical_timings() do { } while (0)
50# define start_critical_timings() do { } while (0)
51#endif
52
53#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
54
55#include <asm/irqflags.h>
56
57#define local_irq_enable() \
58 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
59#define local_irq_disable() \
60 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
61#define local_irq_save(flags) \
62 do { raw_local_irq_save(flags); trace_hardirqs_off(); } while (0)
63
64#define local_irq_restore(flags) \
65 do { \
66 if (raw_irqs_disabled_flags(flags)) { \
67 raw_local_irq_restore(flags); \
68 trace_hardirqs_off(); \
69 } else { \
70 trace_hardirqs_on(); \
71 raw_local_irq_restore(flags); \
72 } \
73 } while (0)
74#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
75/*
76 * The local_irq_*() APIs are equal to the raw_local_irq*()
77 * if !TRACE_IRQFLAGS.
78 */
79# define raw_local_irq_disable() local_irq_disable()
80# define raw_local_irq_enable() local_irq_enable()
81# define raw_local_irq_save(flags) local_irq_save(flags)
82# define raw_local_irq_restore(flags) local_irq_restore(flags)
83#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
84
85#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
86#define safe_halt() \
87 do { \
88 trace_hardirqs_on(); \
89 raw_safe_halt(); \
90 } while (0)
91
92#define local_save_flags(flags) raw_local_save_flags(flags)
93
94#define irqs_disabled() \
95({ \
96 unsigned long _flags; \
97 \
98 raw_local_save_flags(_flags); \
99 raw_irqs_disabled_flags(_flags); \
100})
101
102#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
103#endif /* CONFIG_X86 */
104
105#endif