LXR linux/include/linux/irqflags.h

   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
  16#ifdef CONFIG_TRACE_IRQFLAGS
  17  extern void trace_softirqs_on(unsigned long ip);
  18  extern void trace_softirqs_off(unsigned long ip);
  19  extern void trace_hardirqs_on(void);
  20  extern void trace_hardirqs_off(void);
  21# define trace_hardirq_context(p)       ((p)->hardirq_context)
  22# define trace_softirq_context(p)       ((p)->softirq_context)
  23# define trace_hardirqs_enabled(p)      ((p)->hardirqs_enabled)
  24# define trace_softirqs_enabled(p)      ((p)->softirqs_enabled)
  25# define trace_hardirq_enter()  do { current->hardirq_context++; } while (0)
  26# define trace_hardirq_exit()   do { current->hardirq_context--; } while (0)
  27# define lockdep_softirq_enter()        do { current->softirq_context++; } while (0)
  28# define lockdep_softirq_exit() do { current->softirq_context--; } while (0)
  29# define INIT_TRACE_IRQFLAGS    .softirqs_enabled = 1,
  30#else
  31# define trace_hardirqs_on()            do { } while (0)
  32# define trace_hardirqs_off()           do { } while (0)
  33# define trace_softirqs_on(ip)          do { } while (0)
  34# define trace_softirqs_off(ip)         do { } while (0)
  35# define trace_hardirq_context(p)       0
  36# define trace_softirq_context(p)       0
  37# define trace_hardirqs_enabled(p)      0
  38# define trace_softirqs_enabled(p)      0
  39# define trace_hardirq_enter()          do { } while (0)
  40# define trace_hardirq_exit()           do { } while (0)
  41# define lockdep_softirq_enter()        do { } while (0)
  42# define lockdep_softirq_exit()         do { } while (0)
  43# define INIT_TRACE_IRQFLAGS
  44#endif
  45
  46#if defined(CONFIG_IRQSOFF_TRACER) || \
  47        defined(CONFIG_PREEMPT_TRACER)
  48 extern void stop_critical_timings(void);
  49 extern void start_critical_timings(void);
  50#else
  51# define stop_critical_timings() do { } while (0)
  52# define start_critical_timings() do { } while (0)
  53#endif
  54
  55#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
  56
  57#include <asm/irqflags.h>
  58
  59#define local_irq_enable() \
  60        do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
  61#define local_irq_disable() \
  62        do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
  63#define local_irq_save(flags)                           \
  64        do {                                            \
  65                typecheck(unsigned long, flags);        \
  66                raw_local_irq_save(flags);              \
  67                trace_hardirqs_off();                   \
  68        } while (0)
  69
  70
  71#define local_irq_restore(flags)                        \
  72        do {                                            \
  73                typecheck(unsigned long, flags);        \
  74                if (raw_irqs_disabled_flags(flags)) {   \
  75                        raw_local_irq_restore(flags);   \
  76                        trace_hardirqs_off();           \
  77                } else {                                \
  78                        trace_hardirqs_on();            \
  79                        raw_local_irq_restore(flags);   \
  80                }                                       \
  81        } while (0)
  82#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
  83/*
  84 * The local_irq_*() APIs are equal to the raw_local_irq*()
  85 * if !TRACE_IRQFLAGS.
  86 */
  87# define raw_local_irq_disable()        local_irq_disable()
  88# define raw_local_irq_enable()         local_irq_enable()
  89# define raw_local_irq_save(flags)                      \
  90        do {                                            \
  91                typecheck(unsigned long, flags);        \
  92                local_irq_save(flags);                  \
  93        } while (0)
  94# define raw_local_irq_restore(flags)                   \
  95        do {                                            \
  96                typecheck(unsigned long, flags);        \
  97                local_irq_restore(flags);               \
  98        } while (0)
  99#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
 100
 101#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
 102#define safe_halt()                                             \
 103        do {                                                    \
 104                trace_hardirqs_on();                            \
 105                raw_safe_halt();                                \
 106        } while (0)
 107
 108#define local_save_flags(flags)                         \
 109        do {                                            \
 110                typecheck(unsigned long, flags);        \
 111                raw_local_save_flags(flags);            \
 112        } while (0)
 113
 114#define irqs_disabled()                                         \
 115({                                                              \
 116        unsigned long _flags;                                   \
 117                                                                \
 118        raw_local_save_flags(_flags);                           \
 119        raw_irqs_disabled_flags(_flags);                        \
 120})
 121
 122#define irqs_disabled_flags(flags)              \
 123({                                              \
 124        typecheck(unsigned long, flags);        \
 125        raw_irqs_disabled_flags(flags);         \
 126})
 127#endif          /* CONFIG_X86 */
 128
 129#endif
 130