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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130// 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 <linux/hardirq.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, RCU may not be watching in idle. In that * case, wake up RCU to watch while calling the tracepoint. These * aren't NMI-safe - so exclude NMI contexts: */#ifdef CONFIG_ARCH_WANTS_NO_INSTR#define trace(point, args) trace_##point(args)#else#define trace(point, args) \ do { \ if (__trace_##point##_enabled()) { \ bool exit_rcu = false; \ if (in_nmi()) \ break; \ if (!IS_ENABLED(CONFIG_TINY_RCU) && \ is_idle_task(current)) { \ ct_irq_enter(); \ exit_rcu = true; \ } \ trace_##point(args); \ if (exit_rcu) \ ct_irq_exit(); \ } \ } while (0)#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, TP_ARGS(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, TP_ARGS(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, TP_ARGS(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, TP_ARGS(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, TP_ARGS(a0, a1)); tracer_preempt_on(a0, a1);}
void trace_preempt_off(unsigned long a0, unsigned long a1){ trace(preempt_disable, TP_ARGS(a0, a1)); tracer_preempt_off(a0, a1);}#endif