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 /* dummy wrapper for now: */
  17 #define BUILD_CHECK_IRQ_FLAGS(flags)
  18
  19 #ifdef CONFIG_TRACE_IRQFLAGS
  20   extern void trace_softirqs_on(unsigned long ip);
  21   extern void trace_softirqs_off(unsigned long ip);
  22   extern void trace_hardirqs_on(void);
  23   extern void trace_hardirqs_off(void);
  24 # define trace_hardirq_context(p)       ((p)->hardirq_context)
  25 # define trace_softirq_context(p)       ((p)->softirq_context)
  26 # define trace_hardirqs_enabled(p)      ((p)->hardirqs_enabled)
  27 # define trace_softirqs_enabled(p)      ((p)->softirqs_enabled)
  28 # define trace_hardirq_enter()  do { current->hardirq_context++; } while (0)
  29 # define trace_hardirq_exit()   do { current->hardirq_context--; } while (0)
  30 # define lockdep_softirq_enter()        do { current->softirq_context++; } while (0)
  31 # define lockdep_softirq_exit() do { current->softirq_context--; } while (0)
  32 # define INIT_TRACE_IRQFLAGS    .softirqs_enabled = 1,
  33 #else
  34 # define trace_hardirqs_on()            do { } while (0)
  35 # define trace_hardirqs_off()           do { } while (0)
  36 # define trace_softirqs_on(ip)          do { } while (0)
  37 # define trace_softirqs_off(ip)         do { } while (0)
  38 # define trace_hardirq_context(p)       0
  39 # define trace_softirq_context(p)       0
  40 # define trace_hardirqs_enabled(p)      0
  41 # define trace_softirqs_enabled(p)      0
  42 # define trace_hardirq_enter()          do { } while (0)
  43 # define trace_hardirq_exit()           do { } while (0)
  44 # define lockdep_softirq_enter()        do { } while (0)
  45 # define lockdep_softirq_exit()         do { } while (0)
  46 # define INIT_TRACE_IRQFLAGS
  47 #endif
  48
  49 #if defined(CONFIG_IRQSOFF_TRACER) || \
  50         defined(CONFIG_PREEMPT_TRACER)
  51  extern void stop_critical_timings(void);
  52  extern void start_critical_timings(void);
  53 #else
  54 # define stop_critical_timings() do { } while (0)
  55 # define start_critical_timings() do { } while (0)
  56 #endif
  57
  58 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
  59
  60 #include <asm/irqflags.h>
  61
  62 #define local_irq_enable() \
  63         do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
  64 #define local_irq_disable() \
  65         do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
  66 #define local_irq_save(flags)                           \
  67         do {                                            \
  68                 typecheck(unsigned long, flags);        \
  69                 raw_local_irq_save(flags);              \
  70                 trace_hardirqs_off();                   \
  71         } while (0)
  72
  73
  74 #define local_irq_restore(flags)                        \
  75         do {                                            \
  76                 typecheck(unsigned long, flags);        \
  77                 if (raw_irqs_disabled_flags(flags)) {   \
  78                         raw_local_irq_restore(flags);   \
  79                         trace_hardirqs_off();           \
  80                 } else {                                \
  81                         trace_hardirqs_on();            \
  82                         raw_local_irq_restore(flags);   \
  83                 }                                       \
  84         } while (0)
  85 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
  86 /*
  87  * The local_irq_*() APIs are equal to the raw_local_irq*()
  88  * if !TRACE_IRQFLAGS.
  89  */
  90 # define raw_local_irq_disable()        local_irq_disable()
  91 # define raw_local_irq_enable()         local_irq_enable()
  92 # define raw_local_irq_save(flags)                      \
  93         do {                                            \
  94                 typecheck(unsigned long, flags);        \
  95                 local_irq_save(flags);                  \
  96         } while (0)
  97 # define raw_local_irq_restore(flags)                   \
  98         do {                                            \
  99                 typecheck(unsigned long, flags);        \
 100                 local_irq_restore(flags);               \
 101         } while (0)
 102 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
 103
 104 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
 105 #define safe_halt()                                             \
 106         do {                                                    \
 107                 trace_hardirqs_on();                            \
 108                 raw_safe_halt();                                \
 109         } while (0)
 110
 111 #define local_save_flags(flags)                         \
 112         do {                                            \
 113                 typecheck(unsigned long, flags);        \
 114                 raw_local_save_flags(flags);            \
 115         } while (0)
 116
 117 #define irqs_disabled()                                         \
 118 ({                                                              \
 119         unsigned long _flags;                                   \
 120                                                                 \
 121         raw_local_save_flags(_flags);                           \
 122         raw_irqs_disabled_flags(_flags);                        \
 123 })
 124
 125 #define irqs_disabled_flags(flags)              \
 126 ({                                              \
 127         typecheck(unsigned long, flags);        \
 128         raw_irqs_disabled_flags(flags);         \
 129 })
 130 #endif          /* CONFIG_X86 */
 131
 132 #endif