kernel/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 INIT_TRACE_IRQFLAGS    .softirqs_enabled = 1,
  29 #else
  30 # define trace_hardirqs_on()            do { } while (0)
  31 # define trace_hardirqs_off()           do { } while (0)
  32 # define trace_softirqs_on(ip)          do { } while (0)
  33 # define trace_softirqs_off(ip)         do { } while (0)
  34 # define trace_hardirq_context(p)       0
  35 # define trace_softirq_context(p)       0
  36 # define trace_hardirqs_enabled(p)      0
  37 # define trace_softirqs_enabled(p)      0
  38 # define trace_hardirq_enter()          do { } while (0)
  39 # define trace_hardirq_exit()           do { } while (0)
  40 # define INIT_TRACE_IRQFLAGS
  41 #endif
  42
  43 #if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT_FULL)
  44 # define lockdep_softirq_enter() do { current->softirq_context++; } while (0)
  45 # define lockdep_softirq_exit()  do { current->softirq_context--; } while (0)
  46 #else
  47 # define lockdep_softirq_enter()        do { } while (0)
  48 # define lockdep_softirq_exit()         do { } while (0)
  49 #endif
  50
  51 #if defined(CONFIG_IRQSOFF_TRACER) || \
  52         defined(CONFIG_PREEMPT_TRACER)
  53  extern void stop_critical_timings(void);
  54  extern void start_critical_timings(void);
  55 #else
  56 # define stop_critical_timings() do { } while (0)
  57 # define start_critical_timings() do { } while (0)
  58 #endif
  59
  60 /*
  61  * Wrap the arch provided IRQ routines to provide appropriate checks.
  62  */
  63 #define raw_local_irq_disable()         arch_local_irq_disable()
  64 #define raw_local_irq_enable()          arch_local_irq_enable()
  65 #define raw_local_irq_save(flags)                       \
  66         do {                                            \
  67                 typecheck(unsigned long, flags);        \
  68                 flags = arch_local_irq_save();          \
  69         } while (0)
  70 #define raw_local_irq_restore(flags)                    \
  71         do {                                            \
  72                 typecheck(unsigned long, flags);        \
  73                 arch_local_irq_restore(flags);          \
  74         } while (0)
  75 #define raw_local_save_flags(flags)                     \
  76         do {                                            \
  77                 typecheck(unsigned long, flags);        \
  78                 flags = arch_local_save_flags();        \
  79         } while (0)
  80 #define raw_irqs_disabled_flags(flags)                  \
  81         ({                                              \
  82                 typecheck(unsigned long, flags);        \
  83                 arch_irqs_disabled_flags(flags);        \
  84         })
  85 #define raw_irqs_disabled()             (arch_irqs_disabled())
  86 #define raw_safe_halt()                 arch_safe_halt()
  87
  88 /*
  89  * The local_irq_*() APIs are equal to the raw_local_irq*()
  90  * if !TRACE_IRQFLAGS.
  91  */
  92 #ifdef CONFIG_TRACE_IRQFLAGS
  93 #define local_irq_enable() \
  94         do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
  95 #define local_irq_disable() \
  96         do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
  97 #define local_irq_save(flags)                           \
  98         do {                                            \
  99                 raw_local_irq_save(flags);              \
 100                 trace_hardirqs_off();                   \
 101         } while (0)
 102
 103
 104 #define local_irq_restore(flags)                        \
 105         do {                                            \
 106                 if (raw_irqs_disabled_flags(flags)) {   \
 107                         raw_local_irq_restore(flags);   \
 108                         trace_hardirqs_off();           \
 109                 } else {                                \
 110                         trace_hardirqs_on();            \
 111                         raw_local_irq_restore(flags);   \
 112                 }                                       \
 113         } while (0)
 114
 115 #define safe_halt()                             \
 116         do {                                    \
 117                 trace_hardirqs_on();            \
 118                 raw_safe_halt();                \
 119         } while (0)
 120
 121
 122 #else /* !CONFIG_TRACE_IRQFLAGS */
 123
 124 #define local_irq_enable()      do { raw_local_irq_enable(); } while (0)
 125 #define local_irq_disable()     do { raw_local_irq_disable(); } while (0)
 126 #define local_irq_save(flags)                                   \
 127         do {                                                    \
 128                 raw_local_irq_save(flags);                      \
 129         } while (0)
 130 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
 131 #define safe_halt()             do { raw_safe_halt(); } while (0)
 132
 133 #endif /* CONFIG_TRACE_IRQFLAGS */
 134
 135 #define local_save_flags(flags) raw_local_save_flags(flags)
 136
 137 /*
 138  * Some architectures don't define arch_irqs_disabled(), so even if either
 139  * definition would be fine we need to use different ones for the time being
 140  * to avoid build issues.
 141  */
 142 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
 143 #define irqs_disabled()                                 \
 144         ({                                              \
 145                 unsigned long _flags;                   \
 146                 raw_local_save_flags(_flags);           \
 147                 raw_irqs_disabled_flags(_flags);        \
 148         })
 149 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
 150 #define irqs_disabled() raw_irqs_disabled()
 151 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
 152
 153 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
 154
 155 /*
 156  * local_irq* variants depending on RT/!RT
 157  */
 158 #ifdef CONFIG_PREEMPT_RT_FULL
 159 # define local_irq_disable_nort()       do { } while (0)
 160 # define local_irq_enable_nort()        do { } while (0)
 161 # define local_irq_save_nort(flags)     local_save_flags(flags)
 162 # define local_irq_restore_nort(flags)  (void)(flags)
 163 # define local_irq_disable_rt()         local_irq_disable()
 164 # define local_irq_enable_rt()          local_irq_enable()
 165 #else
 166 # define local_irq_disable_nort()       local_irq_disable()
 167 # define local_irq_enable_nort()        local_irq_enable()
 168 # define local_irq_save_nort(flags)     local_irq_save(flags)
 169 # define local_irq_restore_nort(flags)  local_irq_restore(flags)
 170 # define local_irq_disable_rt()         do { } while (0)
 171 # define local_irq_enable_rt()          do { } while (0)
 172 #endif
 173
 174 #endif