diff options
Diffstat (limited to 'include/linux/irqflags.h')
| -rw-r--r-- | include/linux/irqflags.h | 247 |
1 files changed, 184 insertions, 63 deletions
diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h index d176d658fe25..57b074e0cfbb 100644 --- a/include/linux/irqflags.h +++ b/include/linux/irqflags.h @@ -1,3 +1,4 @@ +/* SPDX-License-Identifier: GPL-2.0 */ /* * include/linux/irqflags.h * @@ -11,37 +12,134 @@ #ifndef _LINUX_TRACE_IRQFLAGS_H #define _LINUX_TRACE_IRQFLAGS_H +#include <linux/irqflags_types.h> #include <linux/typecheck.h> +#include <linux/cleanup.h> #include <asm/irqflags.h> +#include <asm/percpu.h> + +struct task_struct; + +/* 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); + extern void lockdep_cleanup_dead_cpu(unsigned int cpu, + struct task_struct *idle); +#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) { } + static inline void lockdep_cleanup_dead_cpu(unsigned int cpu, + struct task_struct *idle) {} +#endif #ifdef CONFIG_TRACE_IRQFLAGS - extern void trace_softirqs_on(unsigned long ip); - extern void trace_softirqs_off(unsigned long ip); - extern void trace_hardirqs_on(void); - extern void trace_hardirqs_off(void); -# define trace_hardirq_context(p) ((p)->hardirq_context) -# define trace_softirq_context(p) ((p)->softirq_context) -# define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled) -# define trace_softirqs_enabled(p) ((p)->softirqs_enabled) -# define trace_hardirq_enter() do { current->hardirq_context++; } while (0) -# define trace_hardirq_exit() do { current->hardirq_context--; } while (0) -# define lockdep_softirq_enter() do { current->softirq_context++; } while (0) -# define lockdep_softirq_exit() do { current->softirq_context--; } while (0) -# define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1, + +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() do { } while (0) -# define trace_hardirqs_off() do { } while (0) -# define trace_softirqs_on(ip) do { } while (0) -# define trace_softirqs_off(ip) do { } while (0) -# define trace_hardirq_context(p) 0 -# define trace_softirq_context(p) 0 -# define trace_hardirqs_enabled(p) 0 -# define trace_softirqs_enabled(p) 0 -# define trace_hardirq_enter() do { } while (0) -# define trace_hardirq_exit() do { } while (0) -# define lockdep_softirq_enter() do { } while (0) -# define lockdep_softirq_exit() do { } while (0) -# define INIT_TRACE_IRQFLAGS +# 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 + +#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) || \ @@ -53,6 +151,17 @@ # 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. */ @@ -66,6 +175,7 @@ #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) \ @@ -85,44 +195,35 @@ * The local_irq_*() APIs are equal to the raw_local_irq*() * if !TRACE_IRQFLAGS. */ -#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT -#define local_irq_enable() \ - do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) -#define local_irq_disable() \ - do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) -#define local_irq_save(flags) \ +#ifdef CONFIG_TRACE_IRQFLAGS + +#define local_irq_enable() \ do { \ - raw_local_irq_save(flags); \ - trace_hardirqs_off(); \ + trace_hardirqs_on(); \ + raw_local_irq_enable(); \ } while (0) - -#define local_irq_restore(flags) \ +#define local_irq_disable() \ do { \ - if (raw_irqs_disabled_flags(flags)) { \ - raw_local_irq_restore(flags); \ + bool was_disabled = raw_irqs_disabled();\ + raw_local_irq_disable(); \ + if (!was_disabled) \ trace_hardirqs_off(); \ - } else { \ - trace_hardirqs_on(); \ - raw_local_irq_restore(flags); \ - } \ } while (0) -#define local_save_flags(flags) \ + +#define local_irq_save(flags) \ do { \ - raw_local_save_flags(flags); \ + raw_local_irq_save(flags); \ + if (!raw_irqs_disabled_flags(flags)) \ + trace_hardirqs_off(); \ } while (0) -#define irqs_disabled_flags(flags) \ - ({ \ - raw_irqs_disabled_flags(flags); \ - }) - -#define irqs_disabled() \ - ({ \ - unsigned long _flags; \ - raw_local_save_flags(_flags); \ - raw_irqs_disabled_flags(_flags); \ - }) +#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 { \ @@ -131,20 +232,40 @@ } while (0) -#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ +#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_save(flags) do { raw_local_irq_save(flags); } while (0) #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) -#define local_save_flags(flags) do { raw_local_save_flags(flags); } while (0) -#define irqs_disabled() (raw_irqs_disabled()) -#define irqs_disabled_flags(flags) (raw_irqs_disabled_flags(flags)) #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 |