include/linux/irqflags.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * include/linux/irqflags.h
   4  *
   5  * IRQ flags tracing: follow the state of the hardirq and softirq flags and
   6  * provide callbacks for transitions between ON and OFF states.
   7  *
   8  * This file gets included from lowlevel asm headers too, to provide
   9  * wrapped versions of the local_irq_*() APIs, based on the
  10  * raw_local_irq_*() macros from the lowlevel headers.
  11  */
  12 #ifndef _LINUX_TRACE_IRQFLAGS_H
  13 #define _LINUX_TRACE_IRQFLAGS_H
  14
  15 #include <linux/typecheck.h>
  16 #include <asm/irqflags.h>
  17
  18 #ifdef CONFIG_TRACE_IRQFLAGS
  19   extern void trace_softirqs_on(unsigned long ip);
  20   extern void trace_softirqs_off(unsigned long ip);
  21   extern void trace_hardirqs_on(void);
  22   extern void trace_hardirqs_off(void);
  23 # define trace_hardirq_context(p)       ((p)->hardirq_context)
  24 # define trace_softirq_context(p)       ((p)->softirq_context)
  25 # define trace_hardirqs_enabled(p)      ((p)->hardirqs_enabled)
  26 # define trace_softirqs_enabled(p)      ((p)->softirqs_enabled)
  27 # define trace_hardirq_enter()                  \
  28 do {                                            \
  29         current->hardirq_context++;             \
  30 } while (0)
  31 # define trace_hardirq_exit()                   \
  32 do {                                            \
  33         current->hardirq_context--;             \
  34 } while (0)
  35 # define lockdep_softirq_enter()                \
  36 do {                                            \
  37         current->softirq_context++;             \
  38 } while (0)
  39 # define lockdep_softirq_exit()                 \
  40 do {                                            \
  41         current->softirq_context--;             \
  42 } while (0)
  43 # define INIT_TRACE_IRQFLAGS    .softirqs_enabled = 1,
  44 #else
  45 # define trace_hardirqs_on()            do { } while (0)
  46 # define trace_hardirqs_off()           do { } while (0)
  47 # define trace_softirqs_on(ip)          do { } while (0)
  48 # define trace_softirqs_off(ip)         do { } while (0)
  49 # define trace_hardirq_context(p)       0
  50 # define trace_softirq_context(p)       0
  51 # define trace_hardirqs_enabled(p)      0
  52 # define trace_softirqs_enabled(p)      0
  53 # define trace_hardirq_enter()          do { } while (0)
  54 # define trace_hardirq_exit()           do { } while (0)
  55 # define lockdep_softirq_enter()        do { } while (0)
  56 # define lockdep_softirq_exit()         do { } while (0)
  57 # define INIT_TRACE_IRQFLAGS
  58 #endif
  59
  60 #if defined(CONFIG_IRQSOFF_TRACER) || \
  61         defined(CONFIG_PREEMPT_TRACER)
  62  extern void stop_critical_timings(void);
  63  extern void start_critical_timings(void);
  64 #else
  65 # define stop_critical_timings() do { } while (0)
  66 # define start_critical_timings() do { } while (0)
  67 #endif
  68
  69 /*
  70  * Wrap the arch provided IRQ routines to provide appropriate checks.
  71  */
  72 #define raw_local_irq_disable()         arch_local_irq_disable()
  73 #define raw_local_irq_enable()          arch_local_irq_enable()
  74 #define raw_local_irq_save(flags)                       \
  75         do {                                            \
  76                 typecheck(unsigned long, flags);        \
  77                 flags = arch_local_irq_save();          \
  78         } while (0)
  79 #define raw_local_irq_restore(flags)                    \
  80         do {                                            \
  81                 typecheck(unsigned long, flags);        \
  82                 arch_local_irq_restore(flags);          \
  83         } while (0)
  84 #define raw_local_save_flags(flags)                     \
  85         do {                                            \
  86                 typecheck(unsigned long, flags);        \
  87                 flags = arch_local_save_flags();        \
  88         } while (0)
  89 #define raw_irqs_disabled_flags(flags)                  \
  90         ({                                              \
  91                 typecheck(unsigned long, flags);        \
  92                 arch_irqs_disabled_flags(flags);        \
  93         })
  94 #define raw_irqs_disabled()             (arch_irqs_disabled())
  95 #define raw_safe_halt()                 arch_safe_halt()
  96
  97 /*
  98  * The local_irq_*() APIs are equal to the raw_local_irq*()
  99  * if !TRACE_IRQFLAGS.
 100  */
 101 #ifdef CONFIG_TRACE_IRQFLAGS
 102 #define local_irq_enable() \
 103         do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
 104 #define local_irq_disable() \
 105         do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
 106 #define local_irq_save(flags)                           \
 107         do {                                            \
 108                 raw_local_irq_save(flags);              \
 109                 trace_hardirqs_off();                   \
 110         } while (0)
 111
 112
 113 #define local_irq_restore(flags)                        \
 114         do {                                            \
 115                 if (raw_irqs_disabled_flags(flags)) {   \
 116                         raw_local_irq_restore(flags);   \
 117                         trace_hardirqs_off();           \
 118                 } else {                                \
 119                         trace_hardirqs_on();            \
 120                         raw_local_irq_restore(flags);   \
 121                 }                                       \
 122         } while (0)
 123
 124 #define safe_halt()                             \
 125         do {                                    \
 126                 trace_hardirqs_on();            \
 127                 raw_safe_halt();                \
 128         } while (0)
 129
 130
 131 #else /* !CONFIG_TRACE_IRQFLAGS */
 132
 133 #define local_irq_enable()      do { raw_local_irq_enable(); } while (0)
 134 #define local_irq_disable()     do { raw_local_irq_disable(); } while (0)
 135 #define local_irq_save(flags)                                   \
 136         do {                                                    \
 137                 raw_local_irq_save(flags);                      \
 138         } while (0)
 139 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
 140 #define safe_halt()             do { raw_safe_halt(); } while (0)
 141
 142 #endif /* CONFIG_TRACE_IRQFLAGS */
 143
 144 #define local_save_flags(flags) raw_local_save_flags(flags)
 145
 146 /*
 147  * Some architectures don't define arch_irqs_disabled(), so even if either
 148  * definition would be fine we need to use different ones for the time being
 149  * to avoid build issues.
 150  */
 151 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
 152 #define irqs_disabled()                                 \
 153         ({                                              \
 154                 unsigned long _flags;                   \
 155                 raw_local_save_flags(_flags);           \
 156                 raw_irqs_disabled_flags(_flags);        \
 157         })
 158 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
 159 #define irqs_disabled() raw_irqs_disabled()
 160 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
 161
 162 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
 163
 164 #endif