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 /* Currently lockdep_softirqs_on/off is used only by lockdep */
  19 #ifdef CONFIG_PROVE_LOCKING
  20   extern void lockdep_softirqs_on(unsigned long ip);
  21   extern void lockdep_softirqs_off(unsigned long ip);
  22   extern void lockdep_hardirqs_on(unsigned long ip);
  23   extern void lockdep_hardirqs_off(unsigned long ip);
  24 #else
  25   static inline void lockdep_softirqs_on(unsigned long ip) { }
  26   static inline void lockdep_softirqs_off(unsigned long ip) { }
  27   static inline void lockdep_hardirqs_on(unsigned long ip) { }
  28   static inline void lockdep_hardirqs_off(unsigned long ip) { }
  29 #endif
  30
  31 #ifdef CONFIG_TRACE_IRQFLAGS
  32   extern void trace_hardirqs_on(void);
  33   extern void trace_hardirqs_off(void);
  34 # define lockdep_hardirq_context(p)     ((p)->hardirq_context)
  35 # define lockdep_softirq_context(p)     ((p)->softirq_context)
  36 # define lockdep_hardirqs_enabled(p)    ((p)->hardirqs_enabled)
  37 # define lockdep_softirqs_enabled(p)    ((p)->softirqs_enabled)
  38 # define lockdep_hardirq_enter()                \
  39 do {                                            \
  40         if (!current->hardirq_context++)        \
  41                 current->hardirq_threaded = 0;  \
  42 } while (0)
  43 # define lockdep_hardirq_threaded()             \
  44 do {                                            \
  45         current->hardirq_threaded = 1;          \
  46 } while (0)
  47 # define lockdep_hardirq_exit()                 \
  48 do {                                            \
  49         current->hardirq_context--;             \
  50 } while (0)
  51 # define lockdep_softirq_enter()                \
  52 do {                                            \
  53         current->softirq_context++;             \
  54 } while (0)
  55 # define lockdep_softirq_exit()                 \
  56 do {                                            \
  57         current->softirq_context--;             \
  58 } while (0)
  59
  60 # define lockdep_hrtimer_enter(__hrtimer)               \
  61           do {                                          \
  62                   if (!__hrtimer->is_hard)              \
  63                         current->irq_config = 1;        \
  64           } while (0)
  65
  66 # define lockdep_hrtimer_exit(__hrtimer)                \
  67           do {                                          \
  68                   if (!__hrtimer->is_hard)              \
  69                         current->irq_config = 0;        \
  70           } while (0)
  71
  72 # define lockdep_posixtimer_enter()                             \
  73           do {                                                  \
  74                   current->irq_config = 1;                      \
  75           } while (0)
  76
  77 # define lockdep_posixtimer_exit()                              \
  78           do {                                                  \
  79                   current->irq_config = 0;                      \
  80           } while (0)
  81
  82 # define lockdep_irq_work_enter(__work)                                 \
  83           do {                                                          \
  84                   if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
  85                         current->irq_config = 1;                        \
  86           } while (0)
  87 # define lockdep_irq_work_exit(__work)                                  \
  88           do {                                                          \
  89                   if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
  90                         current->irq_config = 0;                        \
  91           } while (0)
  92
  93 #else
  94 # define trace_hardirqs_on()            do { } while (0)
  95 # define trace_hardirqs_off()           do { } while (0)
  96 # define lockdep_hardirq_context(p)     0
  97 # define lockdep_softirq_context(p)     0
  98 # define lockdep_hardirqs_enabled(p)    0
  99 # define lockdep_softirqs_enabled(p)    0
 100 # define lockdep_hardirq_enter()        do { } while (0)
 101 # define lockdep_hardirq_threaded()     do { } while (0)
 102 # define lockdep_hardirq_exit()         do { } while (0)
 103 # define lockdep_softirq_enter()        do { } while (0)
 104 # define lockdep_softirq_exit()         do { } while (0)
 105 # define lockdep_hrtimer_enter(__hrtimer)               do { } while (0)
 106 # define lockdep_hrtimer_exit(__hrtimer)                do { } while (0)
 107 # define lockdep_posixtimer_enter()             do { } while (0)
 108 # define lockdep_posixtimer_exit()              do { } while (0)
 109 # define lockdep_irq_work_enter(__work)         do { } while (0)
 110 # define lockdep_irq_work_exit(__work)          do { } while (0)
 111 #endif
 112
 113 #if defined(CONFIG_IRQSOFF_TRACER) || \
 114         defined(CONFIG_PREEMPT_TRACER)
 115  extern void stop_critical_timings(void);
 116  extern void start_critical_timings(void);
 117 #else
 118 # define stop_critical_timings() do { } while (0)
 119 # define start_critical_timings() do { } while (0)
 120 #endif
 121
 122 /*
 123  * Wrap the arch provided IRQ routines to provide appropriate checks.
 124  */
 125 #define raw_local_irq_disable()         arch_local_irq_disable()
 126 #define raw_local_irq_enable()          arch_local_irq_enable()
 127 #define raw_local_irq_save(flags)                       \
 128         do {                                            \
 129                 typecheck(unsigned long, flags);        \
 130                 flags = arch_local_irq_save();          \
 131         } while (0)
 132 #define raw_local_irq_restore(flags)                    \
 133         do {                                            \
 134                 typecheck(unsigned long, flags);        \
 135                 arch_local_irq_restore(flags);          \
 136         } while (0)
 137 #define raw_local_save_flags(flags)                     \
 138         do {                                            \
 139                 typecheck(unsigned long, flags);        \
 140                 flags = arch_local_save_flags();        \
 141         } while (0)
 142 #define raw_irqs_disabled_flags(flags)                  \
 143         ({                                              \
 144                 typecheck(unsigned long, flags);        \
 145                 arch_irqs_disabled_flags(flags);        \
 146         })
 147 #define raw_irqs_disabled()             (arch_irqs_disabled())
 148 #define raw_safe_halt()                 arch_safe_halt()
 149
 150 /*
 151  * The local_irq_*() APIs are equal to the raw_local_irq*()
 152  * if !TRACE_IRQFLAGS.
 153  */
 154 #ifdef CONFIG_TRACE_IRQFLAGS
 155 #define local_irq_enable() \
 156         do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
 157 #define local_irq_disable() \
 158         do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
 159 #define local_irq_save(flags)                           \
 160         do {                                            \
 161                 raw_local_irq_save(flags);              \
 162                 trace_hardirqs_off();                   \
 163         } while (0)
 164
 165
 166 #define local_irq_restore(flags)                        \
 167         do {                                            \
 168                 if (raw_irqs_disabled_flags(flags)) {   \
 169                         raw_local_irq_restore(flags);   \
 170                         trace_hardirqs_off();           \
 171                 } else {                                \
 172                         trace_hardirqs_on();            \
 173                         raw_local_irq_restore(flags);   \
 174                 }                                       \
 175         } while (0)
 176
 177 #define safe_halt()                             \
 178         do {                                    \
 179                 trace_hardirqs_on();            \
 180                 raw_safe_halt();                \
 181         } while (0)
 182
 183
 184 #else /* !CONFIG_TRACE_IRQFLAGS */
 185
 186 #define local_irq_enable()      do { raw_local_irq_enable(); } while (0)
 187 #define local_irq_disable()     do { raw_local_irq_disable(); } while (0)
 188 #define local_irq_save(flags)                                   \
 189         do {                                                    \
 190                 raw_local_irq_save(flags);                      \
 191         } while (0)
 192 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
 193 #define safe_halt()             do { raw_safe_halt(); } while (0)
 194
 195 #endif /* CONFIG_TRACE_IRQFLAGS */
 196
 197 #define local_save_flags(flags) raw_local_save_flags(flags)
 198
 199 /*
 200  * Some architectures don't define arch_irqs_disabled(), so even if either
 201  * definition would be fine we need to use different ones for the time being
 202  * to avoid build issues.
 203  */
 204 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
 205 #define irqs_disabled()                                 \
 206         ({                                              \
 207                 unsigned long _flags;                   \
 208                 raw_local_save_flags(_flags);           \
 209                 raw_irqs_disabled_flags(_flags);        \
 210         })
 211 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
 212 #define irqs_disabled() raw_irqs_disabled()
 213 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
 214
 215 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
 216
 217 #endif