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 #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
  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
 111 #define safe_halt()                             \
 112         do {                                    \
 113                 trace_hardirqs_on();            \
 114                 raw_safe_halt();                \
 115         } while (0)
 116
 117
 118 #else /* !CONFIG_TRACE_IRQFLAGS */
 119
 120 #define local_irq_enable()      do { raw_local_irq_enable(); } while (0)
 121 #define local_irq_disable()     do { raw_local_irq_disable(); } while (0)
 122 #define local_irq_save(flags)                                   \
 123         do {                                                    \
 124                 raw_local_irq_save(flags);                      \
 125         } while (0)
 126 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
 127 #define safe_halt()             do { raw_safe_halt(); } while (0)
 128
 129 #endif /* CONFIG_TRACE_IRQFLAGS */
 130
 131 #define local_save_flags(flags) raw_local_save_flags(flags)
 132
 133 /*
 134  * Some architectures don't define arch_irqs_disabled(), so even if either
 135  * definition would be fine we need to use different ones for the time being
 136  * to avoid build issues.
 137  */
 138 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
 139 #define irqs_disabled()                                 \
 140         ({                                              \
 141                 unsigned long _flags;                   \
 142                 raw_local_save_flags(_flags);           \
 143                 raw_irqs_disabled_flags(_flags);        \
 144         })
 145 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
 146 #define irqs_disabled() raw_irqs_disabled()
 147 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
 148
 149 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
 150
 151 #endif