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 ({                                                      \
  62         bool __expires_hardirq = true;                  \
  63                                                         \
  64         if (!__hrtimer->is_hard) {                      \
  65                 current->irq_config = 1;                \
  66                 __expires_hardirq = false;              \
  67         }                                               \
  68         __expires_hardirq;                              \
  69 })
  70
  71 # define lockdep_hrtimer_exit(__expires_hardirq)        \
  72         do {                                            \
  73                 if (!__expires_hardirq)                 \
  74                         current->irq_config = 0;        \
  75         } while (0)
  76
  77 # define lockdep_posixtimer_enter()                             \
  78           do {                                                  \
  79                   current->irq_config = 1;                      \
  80           } while (0)
  81
  82 # define lockdep_posixtimer_exit()                              \
  83           do {                                                  \
  84                   current->irq_config = 0;                      \
  85           } while (0)
  86
  87 # define lockdep_irq_work_enter(__work)                                 \
  88           do {                                                          \
  89                   if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
  90                         current->irq_config = 1;                        \
  91           } while (0)
  92 # define lockdep_irq_work_exit(__work)                                  \
  93           do {                                                          \
  94                   if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
  95                         current->irq_config = 0;                        \
  96           } while (0)
  97
  98 #else
  99 # define trace_hardirqs_on()            do { } while (0)
 100 # define trace_hardirqs_off()           do { } while (0)
 101 # define lockdep_hardirq_context(p)     0
 102 # define lockdep_softirq_context(p)     0
 103 # define lockdep_hardirqs_enabled(p)    0
 104 # define lockdep_softirqs_enabled(p)    0
 105 # define lockdep_hardirq_enter()        do { } while (0)
 106 # define lockdep_hardirq_threaded()     do { } while (0)
 107 # define lockdep_hardirq_exit()         do { } while (0)
 108 # define lockdep_softirq_enter()        do { } while (0)
 109 # define lockdep_softirq_exit()         do { } while (0)
 110 # define lockdep_hrtimer_enter(__hrtimer)       false
 111 # define lockdep_hrtimer_exit(__context)        do { } while (0)
 112 # define lockdep_posixtimer_enter()             do { } while (0)
 113 # define lockdep_posixtimer_exit()              do { } while (0)
 114 # define lockdep_irq_work_enter(__work)         do { } while (0)
 115 # define lockdep_irq_work_exit(__work)          do { } while (0)
 116 #endif
 117
 118 #if defined(CONFIG_IRQSOFF_TRACER) || \
 119         defined(CONFIG_PREEMPT_TRACER)
 120  extern void stop_critical_timings(void);
 121  extern void start_critical_timings(void);
 122 #else
 123 # define stop_critical_timings() do { } while (0)
 124 # define start_critical_timings() do { } while (0)
 125 #endif
 126
 127 /*
 128  * Wrap the arch provided IRQ routines to provide appropriate checks.
 129  */
 130 #define raw_local_irq_disable()         arch_local_irq_disable()
 131 #define raw_local_irq_enable()          arch_local_irq_enable()
 132 #define raw_local_irq_save(flags)                       \
 133         do {                                            \
 134                 typecheck(unsigned long, flags);        \
 135                 flags = arch_local_irq_save();          \
 136         } while (0)
 137 #define raw_local_irq_restore(flags)                    \
 138         do {                                            \
 139                 typecheck(unsigned long, flags);        \
 140                 arch_local_irq_restore(flags);          \
 141         } while (0)
 142 #define raw_local_save_flags(flags)                     \
 143         do {                                            \
 144                 typecheck(unsigned long, flags);        \
 145                 flags = arch_local_save_flags();        \
 146         } while (0)
 147 #define raw_irqs_disabled_flags(flags)                  \
 148         ({                                              \
 149                 typecheck(unsigned long, flags);        \
 150                 arch_irqs_disabled_flags(flags);        \
 151         })
 152 #define raw_irqs_disabled()             (arch_irqs_disabled())
 153 #define raw_safe_halt()                 arch_safe_halt()
 154
 155 /*
 156  * The local_irq_*() APIs are equal to the raw_local_irq*()
 157  * if !TRACE_IRQFLAGS.
 158  */
 159 #ifdef CONFIG_TRACE_IRQFLAGS
 160 #define local_irq_enable() \
 161         do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
 162 #define local_irq_disable() \
 163         do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
 164 #define local_irq_save(flags)                           \
 165         do {                                            \
 166                 raw_local_irq_save(flags);              \
 167                 trace_hardirqs_off();                   \
 168         } while (0)
 169
 170
 171 #define local_irq_restore(flags)                        \
 172         do {                                            \
 173                 if (raw_irqs_disabled_flags(flags)) {   \
 174                         raw_local_irq_restore(flags);   \
 175                         trace_hardirqs_off();           \
 176                 } else {                                \
 177                         trace_hardirqs_on();            \
 178                         raw_local_irq_restore(flags);   \
 179                 }                                       \
 180         } while (0)
 181
 182 #define safe_halt()                             \
 183         do {                                    \
 184                 trace_hardirqs_on();            \
 185                 raw_safe_halt();                \
 186         } while (0)
 187
 188
 189 #else /* !CONFIG_TRACE_IRQFLAGS */
 190
 191 #define local_irq_enable()      do { raw_local_irq_enable(); } while (0)
 192 #define local_irq_disable()     do { raw_local_irq_disable(); } while (0)
 193 #define local_irq_save(flags)                                   \
 194         do {                                                    \
 195                 raw_local_irq_save(flags);                      \
 196         } while (0)
 197 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
 198 #define safe_halt()             do { raw_safe_halt(); } while (0)
 199
 200 #endif /* CONFIG_TRACE_IRQFLAGS */
 201
 202 #define local_save_flags(flags) raw_local_save_flags(flags)
 203
 204 /*
 205  * Some architectures don't define arch_irqs_disabled(), so even if either
 206  * definition would be fine we need to use different ones for the time being
 207  * to avoid build issues.
 208  */
 209 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
 210 #define irqs_disabled()                                 \
 211         ({                                              \
 212                 unsigned long _flags;                   \
 213                 raw_local_save_flags(_flags);           \
 214                 raw_irqs_disabled_flags(_flags);        \
 215         })
 216 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
 217 #define irqs_disabled() raw_irqs_disabled()
 218 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
 219
 220 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
 221
 222 #endif