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편집 파일: irqflags.h

/* 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 #include <linux/typecheck.h> #include <linux/cleanup.h> #include <asm/irqflags.h> #include <asm/percpu.h> /* Currently lockdep_softirqs_on/off is used only by lockdep */ #ifdef CONFIG_PROVE_LOCKING extern void lockdep_softirqs_on(unsigned long ip); extern void lockdep_softirqs_off(unsigned long ip); extern void lockdep_hardirqs_on_prepare(void); extern void lockdep_hardirqs_on(unsigned long ip); extern void lockdep_hardirqs_off(unsigned long ip); #else static inline void lockdep_softirqs_on(unsigned long ip) { } static inline void lockdep_softirqs_off(unsigned long ip) { } static inline void lockdep_hardirqs_on_prepare(void) { } static inline void lockdep_hardirqs_on(unsigned long ip) { } static inline void lockdep_hardirqs_off(unsigned long ip) { } #endif #ifdef CONFIG_TRACE_IRQFLAGS /* Per-task IRQ trace events information. */ struct irqtrace_events { unsigned int irq_events; unsigned long hardirq_enable_ip; unsigned long hardirq_disable_ip; unsigned int hardirq_enable_event; unsigned int hardirq_disable_event; unsigned long softirq_disable_ip; unsigned long softirq_enable_ip; unsigned int softirq_disable_event; unsigned int softirq_enable_event; }; DECLARE_PER_CPU(int, hardirqs_enabled); DECLARE_PER_CPU(int, hardirq_context); extern void trace_hardirqs_on_prepare(void); extern void trace_hardirqs_off_finish(void); extern void trace_hardirqs_on(void); extern void trace_hardirqs_off(void); # define lockdep_hardirq_context() (raw_cpu_read(hardirq_context)) # define lockdep_softirq_context(p) ((p)->softirq_context) # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled)) # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled) # define lockdep_hardirq_enter() \ do { \ if (__this_cpu_inc_return(hardirq_context) == 1)\ current->hardirq_threaded = 0; \ } while (0) # define lockdep_hardirq_threaded() \ do { \ current->hardirq_threaded = 1; \ } while (0) # define lockdep_hardirq_exit() \ do { \ __this_cpu_dec(hardirq_context); \ } while (0) # define lockdep_hrtimer_enter(__hrtimer) \ ({ \ bool __expires_hardirq = true; \ \ if (!__hrtimer->is_hard) { \ current->irq_config = 1; \ __expires_hardirq = false; \ } \ __expires_hardirq; \ }) # 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 { } 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 #if defined(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 #if defined(CONFIG_IRQSOFF_TRACER) || \ defined(CONFIG_PREEMPT_TRACER) extern void stop_critical_timings(void); extern void start_critical_timings(void); #else # define stop_critical_timings() do { } while (0) # define start_critical_timings() do { } while (0) #endif #ifdef CONFIG_DEBUG_IRQFLAGS extern void 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(unsigned long, flags); \ flags = arch_local_irq_save(); \ } while (0) #define raw_local_irq_restore(flags) \ do { \ typecheck(unsigned long, flags); \ raw_check_bogus_irq_restore(); \ arch_local_irq_restore(flags); \ } while (0) #define raw_local_save_flags(flags) \ do { \ typecheck(unsigned long, flags); \ flags = arch_local_save_flags(); \ } while (0) #define raw_irqs_disabled_flags(flags) \ ({ \ typecheck(unsigned long, 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) #endif /* CONFIG_TRACE_IRQFLAGS */ #define local_save_flags(flags) raw_local_save_flags(flags) /* * 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() \ ({ \ unsigned long _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 */ #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) DEFINE_LOCK_GUARD_0(irq, local_irq_disable(), local_irq_enable()) DEFINE_LOCK_GUARD_0(irqsave, local_irq_save(_T->flags), local_irq_restore(_T->flags), unsigned long flags) #endif