irqflags.h

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/*
 * include/linux/irqflags.h
 *
 * IRQ flags tracing: follow the state of the hardirq and softirq flags and
 * provide callbacks for transitions between ON and OFF states.
 *
 * This file gets included from lowlevel asm headers too, to provide
 * wrapped versions of the local_irq_*() APIs, based on the
 * raw_local_irq_*() macros from the lowlevel headers.
 */
#ifndef _LINUX_TRACE_IRQFLAGS_H
#define _LINUX_TRACE_IRQFLAGS_H

#include <linux/typecheck.h>
#include <asm/irqflags.h>

#ifdef CONFIG_TRACE_IRQFLAGS
  extern void trace_softirqs_on(unsigned long ip);
  extern void trace_softirqs_off(unsigned long ip);
  extern void trace_hardirqs_on(void);
  extern void trace_hardirqs_off(void);
# define trace_hardirq_context(p)   ((p)->hardirq_context)
# define trace_softirq_context(p)   ((p)->softirq_context)
# define trace_hardirqs_enabled(p)  ((p)->hardirqs_enabled)
# define trace_softirqs_enabled(p)  ((p)->softirqs_enabled)
# define trace_hardirq_enter()  do { current->hardirq_context++; } while (0)
# define trace_hardirq_exit()   do { current->hardirq_context--; } while (0)
# define lockdep_softirq_enter()    do { current->softirq_context++; } while (0)
# define lockdep_softirq_exit() do { current->softirq_context--; } while (0)
# define INIT_TRACE_IRQFLAGS    .softirqs_enabled = 1,
#else
# define trace_hardirqs_on()        do { } while (0)
# define trace_hardirqs_off()       do { } while (0)
# define trace_softirqs_on(ip)      do { } while (0)
# define trace_softirqs_off(ip)     do { } while (0)
# define trace_hardirq_context(p)   0
# define trace_softirq_context(p)   0
# define trace_hardirqs_enabled(p)  0
# define trace_softirqs_enabled(p)  0
# define trace_hardirq_enter()      do { } while (0)
# define trace_hardirq_exit()       do { } while (0)
# define lockdep_softirq_enter()    do { } while (0)
# define lockdep_softirq_exit()     do { } while (0)
# define INIT_TRACE_IRQFLAGS
#endif

#if defined(CONFIG_IRQSOFF_TRACER) || \
    defined(CONFIG_PREEMPT_TRACER)
 extern void stop_critical_timings(void);
 extern void start_critical_timings(void);
#else
# define stop_critical_timings() do { } while (0)
# define start_critical_timings() do { } while (0)
#endif

/*
 * Wrap the arch provided IRQ routines to provide appropriate checks.
 */
#define raw_local_irq_disable()     arch_local_irq_disable()
#define raw_local_irq_enable()      arch_local_irq_enable()
#define raw_local_irq_save(flags)           \
    do {                        \
        typecheck(unsigned long, flags);    \
        flags = arch_local_irq_save();      \
    } while (0)
#define raw_local_irq_restore(flags)            \
    do {                        \
        typecheck(unsigned long, flags);    \
        arch_local_irq_restore(flags);      \
    } while (0)
#define raw_local_save_flags(flags)         \
    do {                        \
        typecheck(unsigned long, flags);    \
        flags = arch_local_save_flags();    \
    } while (0)
#define raw_irqs_disabled_flags(flags)          \
    ({                      \
        typecheck(unsigned long, flags);    \
        arch_irqs_disabled_flags(flags);    \
    })
#define raw_irqs_disabled()     (arch_irqs_disabled())
#define raw_safe_halt()         arch_safe_halt()

/*
 * The local_irq_*() APIs are equal to the raw_local_irq*()
 * if !TRACE_IRQFLAGS.
 */
#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
#define local_irq_enable() \
    do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
#define local_irq_disable() \
    do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
#define local_irq_save(flags)               \
    do {                        \
        raw_local_irq_save(flags);      \
        trace_hardirqs_off();           \
    } while (0)


#define local_irq_restore(flags)            \
    do {                        \
        if (raw_irqs_disabled_flags(flags)) {   \
            raw_local_irq_restore(flags);   \
            trace_hardirqs_off();       \
        } else {                \
            trace_hardirqs_on();        \
            raw_local_irq_restore(flags);   \
        }                   \
    } while (0)
#define local_save_flags(flags)             \
    do {                        \
        raw_local_save_flags(flags);        \
    } while (0)

#define irqs_disabled_flags(flags)          \
    ({                      \
        raw_irqs_disabled_flags(flags);     \
    })

#define irqs_disabled()                 \
    ({                      \
        unsigned long _flags;           \
        raw_local_save_flags(_flags);       \
        raw_irqs_disabled_flags(_flags);    \
    })

#define safe_halt()             \
    do {                    \
        trace_hardirqs_on();        \
        raw_safe_halt();        \
    } while (0)


#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */

#define local_irq_enable()  do { raw_local_irq_enable(); } while (0)
#define local_irq_disable() do { raw_local_irq_disable(); } while (0)
#define local_irq_save(flags)                   \
    do {                            \
        raw_local_irq_save(flags);          \
    } while (0)
#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
#define local_save_flags(flags) do { raw_local_save_flags(flags); } while (0)
#define irqs_disabled()     (raw_irqs_disabled())
#define irqs_disabled_flags(flags) (raw_irqs_disabled_flags(flags))
#define safe_halt()     do { raw_safe_halt(); } while (0)

#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */

#endif