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 #ifdef CONFIG_PREEMPT_MONITOR
  48   extern void MT_trace_softirqs_on(unsigned long ip);
  49   extern void MT_trace_softirqs_off(unsigned long ip);
  50   extern void MT_trace_hardirqs_on(void);
  51   extern void MT_trace_hardirqs_off(void);
  52 #endif
  53 #if defined(CONFIG_IRQSOFF_TRACER) || \
  54         defined(CONFIG_PREEMPT_TRACER)
  55  extern void stop_critical_timings(void);
  56  extern void start_critical_timings(void);
  57 #else
  58 # define stop_critical_timings() do { } while (0)
  59 # define start_critical_timings() do { } while (0)
  60 #endif
  61
  62 /*
  63  * Wrap the arch provided IRQ routines to provide appropriate checks.
  64  */
  65 #define raw_local_irq_disable()         arch_local_irq_disable()
  66 #define raw_local_irq_enable()          arch_local_irq_enable()
  67 #define raw_local_irq_save(flags)                       \
  68         do {                                            \
  69                 typecheck(unsigned long, flags);        \
  70                 flags = arch_local_irq_save();          \
  71         } while (0)
  72 #define raw_local_irq_restore(flags)                    \
  73         do {                                            \
  74                 typecheck(unsigned long, flags);        \
  75                 arch_local_irq_restore(flags);          \
  76         } while (0)
  77 #define raw_local_save_flags(flags)                     \
  78         do {                                            \
  79                 typecheck(unsigned long, flags);        \
  80                 flags = arch_local_save_flags();        \
  81         } while (0)
  82 #define raw_irqs_disabled_flags(flags)                  \
  83         ({                                              \
  84                 typecheck(unsigned long, flags);        \
  85                 arch_irqs_disabled_flags(flags);        \
  86         })
  87 #define raw_irqs_disabled()             (arch_irqs_disabled())
  88 #define raw_safe_halt()                 arch_safe_halt()
  89
  90 /*
  91  * The local_irq_*() APIs are equal to the raw_local_irq*()
  92  * if !TRACE_IRQFLAGS.
  93  */
  94 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
  95 #ifdef CONFIG_PREEMPT_MONITOR
  96 #define local_irq_enable() \
  97     do { MT_trace_hardirqs_on();trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
  98 #define local_irq_disable() \
  99     do { raw_local_irq_disable();trace_hardirqs_off(); MT_trace_hardirqs_off(); } while (0)
 100 #define local_irq_save(flags)               \
 101     do {                        \
 102         typecheck(unsigned long, flags);    \
 103         if (irqs_disabled()) {  \
 104             raw_local_irq_save(flags);      \
 105             trace_hardirqs_off();       \
 106         } else {                \
 107             raw_local_irq_save(flags);      \
 108             trace_hardirqs_off();       \
 109             MT_trace_hardirqs_off();            \
 110         } \
 111     } while (0)
 112
 113
 114 #define local_irq_restore(flags)            \
 115     do {                        \
 116         typecheck(unsigned long, flags);    \
 117         if (raw_irqs_disabled_flags(flags)) {   \
 118             raw_local_irq_restore(flags);   \
 119             trace_hardirqs_off();       \
 120         } else {                \
 121             MT_trace_hardirqs_on();     \
 122             trace_hardirqs_on();        \
 123             raw_local_irq_restore(flags);   \
 124         }                   \
 125     } while (0)
 126 #else /* !CONFIG_PREEMPT_MONITOR*/
 127 #define local_irq_enable() \
 128         do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
 129 #define local_irq_disable() \
 130         do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
 131 #define local_irq_save(flags)                           \
 132         do {                                            \
 133                 raw_local_irq_save(flags);              \
 134                 trace_hardirqs_off();                   \
 135         } while (0)
 136
 137
 138 #define local_irq_restore(flags)                        \
 139         do {                                            \
 140                 if (raw_irqs_disabled_flags(flags)) {   \
 141                         raw_local_irq_restore(flags);   \
 142                         trace_hardirqs_off();           \
 143                 } else {                                \
 144                         trace_hardirqs_on();            \
 145                         raw_local_irq_restore(flags);   \
 146                 }                                       \
 147         } while (0)
 148 #endif /* !CONFIG_PREEMPT_MONITOR*/
 149 #define local_save_flags(flags)                         \
 150         do {                                            \
 151                 raw_local_save_flags(flags);            \
 152         } while (0)
 153
 154 #define irqs_disabled_flags(flags)                      \
 155         ({                                              \
 156                 raw_irqs_disabled_flags(flags);         \
 157         })
 158
 159 #define irqs_disabled()                                 \
 160         ({                                              \
 161                 unsigned long _flags;                   \
 162                 raw_local_save_flags(_flags);           \
 163                 raw_irqs_disabled_flags(_flags);        \
 164         })
 165
 166 #define safe_halt()                             \
 167         do {                                    \
 168                 trace_hardirqs_on();            \
 169                 raw_safe_halt();                \
 170         } while (0)
 171
 172
 173 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
 174
 175 #define local_irq_enable()      do { raw_local_irq_enable(); } while (0)
 176 #define local_irq_disable()     do { raw_local_irq_disable(); } while (0)
 177 #define local_irq_save(flags)                                   \
 178         do {                                                    \
 179                 raw_local_irq_save(flags);                      \
 180         } while (0)
 181 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
 182 #define local_save_flags(flags) do { raw_local_save_flags(flags); } while (0)
 183 #define irqs_disabled()         (raw_irqs_disabled())
 184 #define irqs_disabled_flags(flags) (raw_irqs_disabled_flags(flags))
 185 #define safe_halt()             do { raw_safe_halt(); } while (0)
 186
 187 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
 188
 189 #endif