diff options
Diffstat (limited to 'include/linux/irqflags.h')
| -rw-r--r-- | include/linux/irqflags.h | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h new file mode 100644 index 000000000..2b665c32f --- /dev/null +++ b/include/linux/irqflags.h @@ -0,0 +1,277 @@ +/* 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 |