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0995a5dfbe
trace_hardirqs_on/off() is only partially safe vs. RCU idle. The tracer core itself is safe, but the resulting tracepoints can be utilized by e.g. BPF which is unsafe. Provide variants which do not contain the lockdep invocation so the lockdep and tracer invocations can be split at the call site and placed properly. This is required because lockdep needs to be aware of the state before switching away from RCU idle and after switching to RCU idle because these transitions can take locks. As these code pathes are going to be non-instrumentable the tracer can be invoked after RCU is turned on and before the switch to RCU idle. So for these new variants there is no need to invoke the rcuidle aware tracer functions. Name them so they match the lockdep counterparts. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200505134100.270771162@linutronix.de
226 lines
6.7 KiB
C
226 lines
6.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/linux/irqflags.h
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*
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* IRQ flags tracing: follow the state of the hardirq and softirq flags and
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* provide callbacks for transitions between ON and OFF states.
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*
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* This file gets included from lowlevel asm headers too, to provide
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* wrapped versions of the local_irq_*() APIs, based on the
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* raw_local_irq_*() macros from the lowlevel headers.
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*/
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#ifndef _LINUX_TRACE_IRQFLAGS_H
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#define _LINUX_TRACE_IRQFLAGS_H
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#include <linux/typecheck.h>
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#include <asm/irqflags.h>
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/* Currently lockdep_softirqs_on/off is used only by lockdep */
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#ifdef CONFIG_PROVE_LOCKING
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extern void lockdep_softirqs_on(unsigned long ip);
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extern void lockdep_softirqs_off(unsigned long ip);
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extern void lockdep_hardirqs_on(unsigned long ip);
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extern void lockdep_hardirqs_off(unsigned long ip);
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#else
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static inline void lockdep_softirqs_on(unsigned long ip) { }
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static inline void lockdep_softirqs_off(unsigned long ip) { }
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static inline void lockdep_hardirqs_on(unsigned long ip) { }
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static inline void lockdep_hardirqs_off(unsigned long ip) { }
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#endif
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#ifdef CONFIG_TRACE_IRQFLAGS
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extern void trace_hardirqs_on_prepare(void);
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extern void trace_hardirqs_off_prepare(void);
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extern void trace_hardirqs_on(void);
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extern void trace_hardirqs_off(void);
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# define lockdep_hardirq_context(p) ((p)->hardirq_context)
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# define lockdep_softirq_context(p) ((p)->softirq_context)
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# define lockdep_hardirqs_enabled(p) ((p)->hardirqs_enabled)
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# define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
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# define lockdep_hardirq_enter() \
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do { \
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if (!current->hardirq_context++) \
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current->hardirq_threaded = 0; \
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} while (0)
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# define lockdep_hardirq_threaded() \
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do { \
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current->hardirq_threaded = 1; \
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} while (0)
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# define lockdep_hardirq_exit() \
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do { \
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current->hardirq_context--; \
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} while (0)
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# define lockdep_softirq_enter() \
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do { \
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current->softirq_context++; \
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} while (0)
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# define lockdep_softirq_exit() \
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do { \
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current->softirq_context--; \
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} while (0)
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# define lockdep_hrtimer_enter(__hrtimer) \
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({ \
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bool __expires_hardirq = true; \
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\
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if (!__hrtimer->is_hard) { \
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current->irq_config = 1; \
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__expires_hardirq = false; \
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} \
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__expires_hardirq; \
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})
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# define lockdep_hrtimer_exit(__expires_hardirq) \
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do { \
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if (!__expires_hardirq) \
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current->irq_config = 0; \
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} while (0)
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# define lockdep_posixtimer_enter() \
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do { \
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current->irq_config = 1; \
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} while (0)
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# define lockdep_posixtimer_exit() \
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do { \
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current->irq_config = 0; \
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} while (0)
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# define lockdep_irq_work_enter(__work) \
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do { \
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if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
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current->irq_config = 1; \
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} while (0)
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# define lockdep_irq_work_exit(__work) \
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do { \
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if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
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current->irq_config = 0; \
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} while (0)
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#else
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# define trace_hardirqs_on_prepare() do { } while (0)
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# define trace_hardirqs_off_prepare() do { } while (0)
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# define trace_hardirqs_on() do { } while (0)
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# define trace_hardirqs_off() do { } while (0)
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# define lockdep_hardirq_context(p) 0
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# define lockdep_softirq_context(p) 0
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# define lockdep_hardirqs_enabled(p) 0
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# define lockdep_softirqs_enabled(p) 0
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# define lockdep_hardirq_enter() do { } while (0)
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# define lockdep_hardirq_threaded() do { } while (0)
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# define lockdep_hardirq_exit() do { } while (0)
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# define lockdep_softirq_enter() do { } while (0)
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# define lockdep_softirq_exit() do { } while (0)
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# define lockdep_hrtimer_enter(__hrtimer) false
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# define lockdep_hrtimer_exit(__context) do { } while (0)
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# define lockdep_posixtimer_enter() do { } while (0)
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# define lockdep_posixtimer_exit() do { } while (0)
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# define lockdep_irq_work_enter(__work) do { } while (0)
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# define lockdep_irq_work_exit(__work) do { } while (0)
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#endif
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#if defined(CONFIG_IRQSOFF_TRACER) || \
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defined(CONFIG_PREEMPT_TRACER)
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extern void stop_critical_timings(void);
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extern void start_critical_timings(void);
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#else
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# define stop_critical_timings() do { } while (0)
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# define start_critical_timings() do { } while (0)
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#endif
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/*
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* Wrap the arch provided IRQ routines to provide appropriate checks.
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*/
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#define raw_local_irq_disable() arch_local_irq_disable()
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#define raw_local_irq_enable() arch_local_irq_enable()
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#define raw_local_irq_save(flags) \
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do { \
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typecheck(unsigned long, flags); \
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flags = arch_local_irq_save(); \
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} while (0)
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#define raw_local_irq_restore(flags) \
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do { \
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typecheck(unsigned long, flags); \
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arch_local_irq_restore(flags); \
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} while (0)
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#define raw_local_save_flags(flags) \
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do { \
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typecheck(unsigned long, flags); \
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flags = arch_local_save_flags(); \
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} while (0)
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#define raw_irqs_disabled_flags(flags) \
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({ \
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typecheck(unsigned long, flags); \
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arch_irqs_disabled_flags(flags); \
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})
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#define raw_irqs_disabled() (arch_irqs_disabled())
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#define raw_safe_halt() arch_safe_halt()
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/*
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* The local_irq_*() APIs are equal to the raw_local_irq*()
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* if !TRACE_IRQFLAGS.
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*/
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#ifdef CONFIG_TRACE_IRQFLAGS
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#define local_irq_enable() \
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do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
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#define local_irq_disable() \
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do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
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#define local_irq_save(flags) \
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do { \
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raw_local_irq_save(flags); \
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trace_hardirqs_off(); \
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} while (0)
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#define local_irq_restore(flags) \
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do { \
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if (raw_irqs_disabled_flags(flags)) { \
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raw_local_irq_restore(flags); \
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trace_hardirqs_off(); \
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} else { \
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trace_hardirqs_on(); \
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raw_local_irq_restore(flags); \
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} \
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} while (0)
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#define safe_halt() \
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do { \
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trace_hardirqs_on(); \
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raw_safe_halt(); \
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} while (0)
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#else /* !CONFIG_TRACE_IRQFLAGS */
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#define local_irq_enable() do { raw_local_irq_enable(); } while (0)
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#define local_irq_disable() do { raw_local_irq_disable(); } while (0)
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#define local_irq_save(flags) \
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do { \
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raw_local_irq_save(flags); \
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} while (0)
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#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
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#define safe_halt() do { raw_safe_halt(); } while (0)
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#endif /* CONFIG_TRACE_IRQFLAGS */
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#define local_save_flags(flags) raw_local_save_flags(flags)
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/*
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* Some architectures don't define arch_irqs_disabled(), so even if either
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* definition would be fine we need to use different ones for the time being
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* to avoid build issues.
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*/
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#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
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#define irqs_disabled() \
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({ \
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unsigned long _flags; \
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raw_local_save_flags(_flags); \
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raw_irqs_disabled_flags(_flags); \
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})
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#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
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#define irqs_disabled() raw_irqs_disabled()
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#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
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#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
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#endif
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