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Diffstat (limited to 'kernel/trace/trace_preemptirq.c')
| -rw-r--r-- | kernel/trace/trace_preemptirq.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/kernel/trace/trace_preemptirq.c b/kernel/trace/trace_preemptirq.c new file mode 100644 index 000000000..e37446f79 --- /dev/null +++ b/kernel/trace/trace_preemptirq.c @@ -0,0 +1,112 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * preemptoff and irqoff tracepoints + * + * Copyright (C) Joel Fernandes (Google) <joel@joelfernandes.org> + */ + +#include <linux/kallsyms.h> +#include <linux/uaccess.h> +#include <linux/module.h> +#include <linux/ftrace.h> +#include <linux/kprobes.h> +#include "trace.h" + +#define CREATE_TRACE_POINTS +#include <trace/events/preemptirq.h> + +/* + * Use regular trace points on architectures that implement noinstr + * tooling: these calls will only happen with RCU enabled, which can + * use a regular tracepoint. + * + * On older architectures, use the rcuidle tracing methods (which + * aren't NMI-safe - so exclude NMI contexts): + */ +#ifdef CONFIG_ARCH_WANTS_NO_INSTR +#define trace(point) trace_##point +#else +#define trace(point) if (!in_nmi()) trace_##point##_rcuidle +#endif + +#ifdef CONFIG_TRACE_IRQFLAGS +/* Per-cpu variable to prevent redundant calls when IRQs already off */ +static DEFINE_PER_CPU(int, tracing_irq_cpu); + +/* + * Like trace_hardirqs_on() but without the lockdep invocation. This is + * used in the low level entry code where the ordering vs. RCU is important + * and lockdep uses a staged approach which splits the lockdep hardirq + * tracking into a RCU on and a RCU off section. + */ +void trace_hardirqs_on_prepare(void) +{ + if (this_cpu_read(tracing_irq_cpu)) { + trace(irq_enable)(CALLER_ADDR0, CALLER_ADDR1); + tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1); + this_cpu_write(tracing_irq_cpu, 0); + } +} +EXPORT_SYMBOL(trace_hardirqs_on_prepare); +NOKPROBE_SYMBOL(trace_hardirqs_on_prepare); + +void trace_hardirqs_on(void) +{ + if (this_cpu_read(tracing_irq_cpu)) { + trace(irq_enable)(CALLER_ADDR0, CALLER_ADDR1); + tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1); + this_cpu_write(tracing_irq_cpu, 0); + } + + lockdep_hardirqs_on_prepare(); + lockdep_hardirqs_on(CALLER_ADDR0); +} +EXPORT_SYMBOL(trace_hardirqs_on); +NOKPROBE_SYMBOL(trace_hardirqs_on); + +/* + * Like trace_hardirqs_off() but without the lockdep invocation. This is + * used in the low level entry code where the ordering vs. RCU is important + * and lockdep uses a staged approach which splits the lockdep hardirq + * tracking into a RCU on and a RCU off section. + */ +void trace_hardirqs_off_finish(void) +{ + if (!this_cpu_read(tracing_irq_cpu)) { + this_cpu_write(tracing_irq_cpu, 1); + tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1); + trace(irq_disable)(CALLER_ADDR0, CALLER_ADDR1); + } + +} +EXPORT_SYMBOL(trace_hardirqs_off_finish); +NOKPROBE_SYMBOL(trace_hardirqs_off_finish); + +void trace_hardirqs_off(void) +{ + lockdep_hardirqs_off(CALLER_ADDR0); + + if (!this_cpu_read(tracing_irq_cpu)) { + this_cpu_write(tracing_irq_cpu, 1); + tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1); + trace(irq_disable)(CALLER_ADDR0, CALLER_ADDR1); + } +} +EXPORT_SYMBOL(trace_hardirqs_off); +NOKPROBE_SYMBOL(trace_hardirqs_off); +#endif /* CONFIG_TRACE_IRQFLAGS */ + +#ifdef CONFIG_TRACE_PREEMPT_TOGGLE + +void trace_preempt_on(unsigned long a0, unsigned long a1) +{ + trace(preempt_enable)(a0, a1); + tracer_preempt_on(a0, a1); +} + +void trace_preempt_off(unsigned long a0, unsigned long a1) +{ + trace(preempt_disable)(a0, a1); + tracer_preempt_off(a0, a1); +} +#endif |