/* SPDX-License-Identifier: GPL-2.0 */ /* * include/linux/irqflags.h * * IRQ flags tracing: follow the state of the hardirq and softirq flags and * provide callbacks for transitions between ON and OFF states. * * This file gets included from lowlevel asm headers too, to provide * wrapped versions of the local_irq_*() APIs, based on the * raw_local_irq_*() macros from the lowlevel headers.
*/ #ifndef _LINUX_TRACE_IRQFLAGS_H #define _LINUX_TRACE_IRQFLAGS_H
# define lockdep_hrtimer_exit(__expires_hardirq) \ do { \ if (!__expires_hardirq) \
current->irq_config = 0; \
} while (0)
# define lockdep_posixtimer_enter() \ do { \
current->irq_config = 1; \
} while (0)
# define lockdep_posixtimer_exit() \ do { \
current->irq_config = 0; \
} while (0)
# define lockdep_irq_work_enter(_flags) \ do { \ if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
current->irq_config = 1; \
} while (0) # define lockdep_irq_work_exit(_flags) \ do { \ if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
current->irq_config = 0; \
} while (0)
#else # define trace_hardirqs_on_prepare() do { } while (0) # define trace_hardirqs_off_finish() do { } while (0) # define trace_hardirqs_on() do { } while (0) # define trace_hardirqs_off() do { } while (0) # define lockdep_hardirq_context() 0 # define lockdep_softirq_context(p) 0 # define lockdep_hardirqs_enabled() 0 # define lockdep_softirqs_enabled(p) 0 # define lockdep_hardirq_enter() do { } while (0) # define lockdep_hardirq_threaded() do { } while (0) # define lockdep_hardirq_exit() do { } while (0) # define lockdep_softirq_enter() do { } while (0) # define lockdep_softirq_exit() do { } while (0) # define lockdep_hrtimer_enter(__hrtimer) false # define lockdep_hrtimer_exit(__context) do { (void)(__context); } while (0) # define lockdep_posixtimer_enter() do { } while (0) # define lockdep_posixtimer_exit() do { } while (0) # define lockdep_irq_work_enter(__work) do { } while (0) # define lockdep_irq_work_exit(__work) do { } while (0) #endif
#ifdefined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT) # define lockdep_softirq_enter() \ do { \
current->softirq_context++; \
} while (0) # define lockdep_softirq_exit() \ do { \
current->softirq_context--; \
} while (0)
#else # define lockdep_softirq_enter() do { } while (0) # define lockdep_softirq_exit() do { } while (0) #endif
#ifdefined(CONFIG_IRQSOFF_TRACER) || \ defined(CONFIG_PREEMPT_TRACER) externvoid stop_critical_timings(void); externvoid start_critical_timings(void); #else # define stop_critical_timings() do { } while (0) # define start_critical_timings() do { } while (0) #endif
#ifdef CONFIG_DEBUG_IRQFLAGS externvoid warn_bogus_irq_restore(void); #define raw_check_bogus_irq_restore() \ do { \ if (unlikely(!arch_irqs_disabled())) \
warn_bogus_irq_restore(); \
} while (0) #else #define raw_check_bogus_irq_restore() do { } while (0) #endif
/* * Wrap the arch provided IRQ routines to provide appropriate checks.
*/ #define raw_local_irq_disable() arch_local_irq_disable() #define raw_local_irq_enable() arch_local_irq_enable() #define raw_local_irq_save(flags) \ do { \
typecheck(unsignedlong, flags); \
flags = arch_local_irq_save(); \
} while (0) #define raw_local_irq_restore(flags) \ do { \
typecheck(unsignedlong, flags); \
raw_check_bogus_irq_restore(); \
arch_local_irq_restore(flags); \
} while (0) #define raw_local_save_flags(flags) \ do { \
typecheck(unsignedlong, flags); \
flags = arch_local_save_flags(); \
} while (0) #define raw_irqs_disabled_flags(flags) \
({ \
typecheck(unsignedlong, flags); \
arch_irqs_disabled_flags(flags); \
}) #define raw_irqs_disabled() (arch_irqs_disabled()) #define raw_safe_halt() arch_safe_halt()
/* * The local_irq_*() APIs are equal to the raw_local_irq*() * if !TRACE_IRQFLAGS.
*/ #ifdef CONFIG_TRACE_IRQFLAGS
#define local_irq_enable() \ do { \
trace_hardirqs_on(); \
raw_local_irq_enable(); \
} while (0)
#define local_irq_disable() \ do { \ bool was_disabled = raw_irqs_disabled();\
raw_local_irq_disable(); \ if (!was_disabled) \
trace_hardirqs_off(); \
} while (0)
#define local_irq_save(flags) \ do { \
raw_local_irq_save(flags); \ if (!raw_irqs_disabled_flags(flags)) \
trace_hardirqs_off(); \
} while (0)
#define local_irq_restore(flags) \ do { \ if (!raw_irqs_disabled_flags(flags)) \
trace_hardirqs_on(); \
raw_local_irq_restore(flags); \
} while (0)
#define safe_halt() \ do { \
trace_hardirqs_on(); \
raw_safe_halt(); \
} while (0)
#else/* !CONFIG_TRACE_IRQFLAGS */
#define local_irq_enable() do { raw_local_irq_enable(); } while (0) #define local_irq_disable() do { raw_local_irq_disable(); } while (0) #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0) #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) #define safe_halt() do { raw_safe_halt(); } while (0)
/* * Some architectures don't define arch_irqs_disabled(), so even if either * definition would be fine we need to use different ones for the time being * to avoid build issues.
*/ #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT #define irqs_disabled() \
({ \ unsignedlong _flags; \
raw_local_save_flags(_flags); \
raw_irqs_disabled_flags(_flags); \
}) #else/* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ #define irqs_disabled() raw_irqs_disabled() #endif/* CONFIG_TRACE_IRQFLAGS_SUPPORT */
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