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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 #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