File: /Users/paulross/dev/linux/linux-3.13/include/linux/irqflags.h

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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: #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_SUPPORT
      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: #define local_save_flags(flags)                \
     111:     do {                        \
     112:         raw_local_save_flags(flags);        \
     113:     } while (0)
     114: 
     115: #define irqs_disabled_flags(flags)            \
     116:     ({                        \
     117:         raw_irqs_disabled_flags(flags);        \
     118:     })
     119: 
     120: #define irqs_disabled()                    \
     121:     ({                        \
     122:         unsigned long _flags;            \
     123:         raw_local_save_flags(_flags);        \
     124:         raw_irqs_disabled_flags(_flags);    \
     125:     })
     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_SUPPORT */
     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 local_save_flags(flags)    do { raw_local_save_flags(flags); } while (0)
     144: #define irqs_disabled()        (raw_irqs_disabled())
     145: #define irqs_disabled_flags(flags) (raw_irqs_disabled_flags(flags))
     146: #define safe_halt()        do { raw_safe_halt(); } while (0)
     147: 
     148: #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
     149: 
     150: #endif
     151: