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