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