linux/include/linux/irqflags.h
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   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_SUPPORT
  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#define local_save_flags(flags)                         \
 111        do {                                            \
 112                raw_local_save_flags(flags);            \
 113        } while (0)
 114
 115#define irqs_disabled_flags(flags)                      \
 116        ({                                              \
 117                raw_irqs_disabled_flags(flags);         \
 118        })
 119
 120#define irqs_disabled()                                 \
 121        ({                                              \
 122                unsigned long _flags;                   \
 123                raw_local_save_flags(_flags);           \
 124                raw_irqs_disabled_flags(_flags);        \
 125        })
 126
 127#define safe_halt()                             \
 128        do {                                    \
 129                trace_hardirqs_on();            \
 130                raw_safe_halt();                \
 131        } while (0)
 132
 133
 134#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
 135
 136#define local_irq_enable()      do { raw_local_irq_enable(); } while (0)
 137#define local_irq_disable()     do { raw_local_irq_disable(); } while (0)
 138#define local_irq_save(flags)                                   \
 139        do {                                                    \
 140                raw_local_irq_save(flags);                      \
 141        } while (0)
 142#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
 143#define local_save_flags(flags) do { raw_local_save_flags(flags); } while (0)
 144#define irqs_disabled()         (raw_irqs_disabled())
 145#define irqs_disabled_flags(flags) (raw_irqs_disabled_flags(flags))
 146#define safe_halt()             do { raw_safe_halt(); } while (0)
 147
 148#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
 149
 150#endif
 151
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