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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 #include <linux/typecheck.h>
  15
  16 #ifdef CONFIG_TRACE_IRQFLAGS
  17   extern void trace_softirqs_on(unsigned long ip);
  18   extern void trace_softirqs_off(unsigned long ip);
  19   extern void trace_hardirqs_on(void);
  20   extern void trace_hardirqs_off(void);
  21 # define trace_hardirq_context(p)       ((p)->hardirq_context)
  22 # define trace_softirq_context(p)       ((p)->softirq_context)
  23 # define trace_hardirqs_enabled(p)      ((p)->hardirqs_enabled)
  24 # define trace_softirqs_enabled(p)      ((p)->softirqs_enabled)
  25 # define trace_hardirq_enter()  do { current->hardirq_context++; } while (0)
  26 # define trace_hardirq_exit()   do { current->hardirq_context--; } while (0)
  27 # define trace_softirq_enter()  do { current->softirq_context++; } while (0)
  28 # define trace_softirq_exit()   do { current->softirq_context--; } while (0)
  29 # define INIT_TRACE_IRQFLAGS    .softirqs_enabled = 1,
  30 #else
  31 # define trace_hardirqs_on()            do { } while (0)
  32 # define trace_hardirqs_off()           do { } while (0)
  33 # define trace_softirqs_on(ip)          do { } while (0)
  34 # define trace_softirqs_off(ip)         do { } while (0)
  35 # define trace_hardirq_context(p)       0
  36 # define trace_softirq_context(p)       0
  37 # define trace_hardirqs_enabled(p)      0
  38 # define trace_softirqs_enabled(p)      0
  39 # define trace_hardirq_enter()          do { } while (0)
  40 # define trace_hardirq_exit()           do { } while (0)
  41 # define trace_softirq_enter()          do { } while (0)
  42 # define trace_softirq_exit()           do { } while (0)
  43 # define INIT_TRACE_IRQFLAGS
  44 #endif
  45
  46 #if defined(CONFIG_IRQSOFF_TRACER) || \
  47         defined(CONFIG_PREEMPT_TRACER)
  48  extern void stop_critical_timings(void);
  49  extern void start_critical_timings(void);
  50 #else
  51 # define stop_critical_timings() do { } while (0)
  52 # define start_critical_timings() do { } while (0)
  53 #endif
  54
  55 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
  56
  57 #include <asm/irqflags.h>
  58
  59 #define local_irq_enable() \
  60         do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
  61 #define local_irq_disable() \
  62         do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
  63 #define local_irq_save(flags)                           \
  64         do {                                            \
  65                 typecheck(unsigned long, flags);        \
  66                 raw_local_irq_save(flags);              \
  67                 trace_hardirqs_off();                   \
  68         } while (0)
  69
  70
  71 #define local_irq_restore(flags)                        \
  72         do {                                            \
  73                 typecheck(unsigned long, flags);        \
  74                 if (raw_irqs_disabled_flags(flags)) {   \
  75                         raw_local_irq_restore(flags);   \
  76                         trace_hardirqs_off();           \
  77                 } else {                                \
  78                         trace_hardirqs_on();            \
  79                         raw_local_irq_restore(flags);   \
  80                 }                                       \
  81         } while (0)
  82 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
  83 /*
  84  * The local_irq_*() APIs are equal to the raw_local_irq*()
  85  * if !TRACE_IRQFLAGS.
  86  */
  87 # define raw_local_irq_disable()        local_irq_disable()
  88 # define raw_local_irq_enable()         local_irq_enable()
  89 # define raw_local_irq_save(flags)                      \
  90         do {                                            \
  91                 typecheck(unsigned long, flags);        \
  92                 local_irq_save(flags);                  \
  93         } while (0)
  94 # define raw_local_irq_restore(flags)                   \
  95         do {                                            \
  96                 typecheck(unsigned long, flags);        \
  97                 local_irq_restore(flags);               \
  98         } while (0)
  99 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
 100
 101 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
 102 #define safe_halt()                                             \
 103         do {                                                    \
 104                 trace_hardirqs_on();                            \
 105                 raw_safe_halt();                                \
 106         } while (0)
 107
 108 #define local_save_flags(flags)                         \
 109         do {                                            \
 110                 typecheck(unsigned long, flags);        \
 111                 raw_local_save_flags(flags);            \
 112         } while (0)
 113
 114 #define irqs_disabled()                                         \
 115 ({                                                              \
 116         unsigned long _flags;                                   \
 117                                                                 \
 118         raw_local_save_flags(_flags);                           \
 119         raw_irqs_disabled_flags(_flags);                        \
 120 })
 121
 122 #define irqs_disabled_flags(flags)              \
 123 ({                                              \
 124         typecheck(unsigned long, flags);        \
 125         raw_irqs_disabled_flags(flags);         \
 126 })
 127 #endif          /* CONFIG_X86 */
 128
 129 #endif