linux/include/linux/irqflags.h
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   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#include <asm/percpu.h>
  18
  19/* Currently lockdep_softirqs_on/off is used only by lockdep */
  20#ifdef CONFIG_PROVE_LOCKING
  21  extern void lockdep_softirqs_on(unsigned long ip);
  22  extern void lockdep_softirqs_off(unsigned long ip);
  23  extern void lockdep_hardirqs_on_prepare(unsigned long ip);
  24  extern void lockdep_hardirqs_on(unsigned long ip);
  25  extern void lockdep_hardirqs_off(unsigned long ip);
  26#else
  27  static inline void lockdep_softirqs_on(unsigned long ip) { }
  28  static inline void lockdep_softirqs_off(unsigned long ip) { }
  29  static inline void lockdep_hardirqs_on_prepare(unsigned long ip) { }
  30  static inline void lockdep_hardirqs_on(unsigned long ip) { }
  31  static inline void lockdep_hardirqs_off(unsigned long ip) { }
  32#endif
  33
  34#ifdef CONFIG_TRACE_IRQFLAGS
  35
  36/* Per-task IRQ trace events information. */
  37struct irqtrace_events {
  38        unsigned int    irq_events;
  39        unsigned long   hardirq_enable_ip;
  40        unsigned long   hardirq_disable_ip;
  41        unsigned int    hardirq_enable_event;
  42        unsigned int    hardirq_disable_event;
  43        unsigned long   softirq_disable_ip;
  44        unsigned long   softirq_enable_ip;
  45        unsigned int    softirq_disable_event;
  46        unsigned int    softirq_enable_event;
  47};
  48
  49DECLARE_PER_CPU(int, hardirqs_enabled);
  50DECLARE_PER_CPU(int, hardirq_context);
  51
  52extern void trace_hardirqs_on_prepare(void);
  53extern void trace_hardirqs_off_finish(void);
  54extern void trace_hardirqs_on(void);
  55extern void trace_hardirqs_off(void);
  56
  57# define lockdep_hardirq_context()      (raw_cpu_read(hardirq_context))
  58# define lockdep_softirq_context(p)     ((p)->softirq_context)
  59# define lockdep_hardirqs_enabled()     (this_cpu_read(hardirqs_enabled))
  60# define lockdep_softirqs_enabled(p)    ((p)->softirqs_enabled)
  61# define lockdep_hardirq_enter()                        \
  62do {                                                    \
  63        if (__this_cpu_inc_return(hardirq_context) == 1)\
  64                current->hardirq_threaded = 0;          \
  65} while (0)
  66# define lockdep_hardirq_threaded()             \
  67do {                                            \
  68        current->hardirq_threaded = 1;          \
  69} while (0)
  70# define lockdep_hardirq_exit()                 \
  71do {                                            \
  72        __this_cpu_dec(hardirq_context);        \
  73} while (0)
  74# define lockdep_softirq_enter()                \
  75do {                                            \
  76        current->softirq_context++;             \
  77} while (0)
  78# define lockdep_softirq_exit()                 \
  79do {                                            \
  80        current->softirq_context--;             \
  81} while (0)
  82
  83# define lockdep_hrtimer_enter(__hrtimer)               \
  84({                                                      \
  85        bool __expires_hardirq = true;                  \
  86                                                        \
  87        if (!__hrtimer->is_hard) {                      \
  88                current->irq_config = 1;                \
  89                __expires_hardirq = false;              \
  90        }                                               \
  91        __expires_hardirq;                              \
  92})
  93
  94# define lockdep_hrtimer_exit(__expires_hardirq)        \
  95        do {                                            \
  96                if (!__expires_hardirq)                 \
  97                        current->irq_config = 0;        \
  98        } while (0)
  99
 100# define lockdep_posixtimer_enter()                             \
 101          do {                                                  \
 102                  current->irq_config = 1;                      \
 103          } while (0)
 104
 105# define lockdep_posixtimer_exit()                              \
 106          do {                                                  \
 107                  current->irq_config = 0;                      \
 108          } while (0)
 109
 110# define lockdep_irq_work_enter(__work)                                 \
 111          do {                                                          \
 112                  if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
 113                        current->irq_config = 1;                        \
 114          } while (0)
 115# define lockdep_irq_work_exit(__work)                                  \
 116          do {                                                          \
 117                  if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
 118                        current->irq_config = 0;                        \
 119          } while (0)
 120
 121#else
 122# define trace_hardirqs_on_prepare()            do { } while (0)
 123# define trace_hardirqs_off_finish()            do { } while (0)
 124# define trace_hardirqs_on()                    do { } while (0)
 125# define trace_hardirqs_off()                   do { } while (0)
 126# define lockdep_hardirq_context()              0
 127# define lockdep_softirq_context(p)             0
 128# define lockdep_hardirqs_enabled()             0
 129# define lockdep_softirqs_enabled(p)            0
 130# define lockdep_hardirq_enter()                do { } while (0)
 131# define lockdep_hardirq_threaded()             do { } while (0)
 132# define lockdep_hardirq_exit()                 do { } while (0)
 133# define lockdep_softirq_enter()                do { } while (0)
 134# define lockdep_softirq_exit()                 do { } while (0)
 135# define lockdep_hrtimer_enter(__hrtimer)       false
 136# define lockdep_hrtimer_exit(__context)        do { } while (0)
 137# define lockdep_posixtimer_enter()             do { } while (0)
 138# define lockdep_posixtimer_exit()              do { } while (0)
 139# define lockdep_irq_work_enter(__work)         do { } while (0)
 140# define lockdep_irq_work_exit(__work)          do { } while (0)
 141#endif
 142
 143#if defined(CONFIG_IRQSOFF_TRACER) || \
 144        defined(CONFIG_PREEMPT_TRACER)
 145 extern void stop_critical_timings(void);
 146 extern void start_critical_timings(void);
 147#else
 148# define stop_critical_timings() do { } while (0)
 149# define start_critical_timings() do { } while (0)
 150#endif
 151
 152/*
 153 * Wrap the arch provided IRQ routines to provide appropriate checks.
 154 */
 155#define raw_local_irq_disable()         arch_local_irq_disable()
 156#define raw_local_irq_enable()          arch_local_irq_enable()
 157#define raw_local_irq_save(flags)                       \
 158        do {                                            \
 159                typecheck(unsigned long, flags);        \
 160                flags = arch_local_irq_save();          \
 161        } while (0)
 162#define raw_local_irq_restore(flags)                    \
 163        do {                                            \
 164                typecheck(unsigned long, flags);        \
 165                arch_local_irq_restore(flags);          \
 166        } while (0)
 167#define raw_local_save_flags(flags)                     \
 168        do {                                            \
 169                typecheck(unsigned long, flags);        \
 170                flags = arch_local_save_flags();        \
 171        } while (0)
 172#define raw_irqs_disabled_flags(flags)                  \
 173        ({                                              \
 174                typecheck(unsigned long, flags);        \
 175                arch_irqs_disabled_flags(flags);        \
 176        })
 177#define raw_irqs_disabled()             (arch_irqs_disabled())
 178#define raw_safe_halt()                 arch_safe_halt()
 179
 180/*
 181 * The local_irq_*() APIs are equal to the raw_local_irq*()
 182 * if !TRACE_IRQFLAGS.
 183 */
 184#ifdef CONFIG_TRACE_IRQFLAGS
 185
 186#define local_irq_enable()                              \
 187        do {                                            \
 188                trace_hardirqs_on();                    \
 189                raw_local_irq_enable();                 \
 190        } while (0)
 191
 192#define local_irq_disable()                             \
 193        do {                                            \
 194                bool was_disabled = raw_irqs_disabled();\
 195                raw_local_irq_disable();                \
 196                if (!was_disabled)                      \
 197                        trace_hardirqs_off();           \
 198        } while (0)
 199
 200#define local_irq_save(flags)                           \
 201        do {                                            \
 202                raw_local_irq_save(flags);              \
 203                if (!raw_irqs_disabled_flags(flags))    \
 204                        trace_hardirqs_off();           \
 205        } while (0)
 206
 207#define local_irq_restore(flags)                        \
 208        do {                                            \
 209                if (!raw_irqs_disabled_flags(flags))    \
 210                        trace_hardirqs_on();            \
 211                raw_local_irq_restore(flags);           \
 212        } while (0)
 213
 214#define safe_halt()                             \
 215        do {                                    \
 216                trace_hardirqs_on();            \
 217                raw_safe_halt();                \
 218        } while (0)
 219
 220
 221#else /* !CONFIG_TRACE_IRQFLAGS */
 222
 223#define local_irq_enable()      do { raw_local_irq_enable(); } while (0)
 224#define local_irq_disable()     do { raw_local_irq_disable(); } while (0)
 225#define local_irq_save(flags)   do { raw_local_irq_save(flags); } while (0)
 226#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
 227#define safe_halt()             do { raw_safe_halt(); } while (0)
 228
 229#endif /* CONFIG_TRACE_IRQFLAGS */
 230
 231#define local_save_flags(flags) raw_local_save_flags(flags)
 232
 233/*
 234 * Some architectures don't define arch_irqs_disabled(), so even if either
 235 * definition would be fine we need to use different ones for the time being
 236 * to avoid build issues.
 237 */
 238#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
 239#define irqs_disabled()                                 \
 240        ({                                              \
 241                unsigned long _flags;                   \
 242                raw_local_save_flags(_flags);           \
 243                raw_irqs_disabled_flags(_flags);        \
 244        })
 245#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
 246#define irqs_disabled() raw_irqs_disabled()
 247#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
 248
 249#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
 250
 251#endif
 252