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73ac74c7d4
Switch order so that locking state is consistent even if the IRQ tracer calls into lockdep again. Acked-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* preemptoff and irqoff tracepoints
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*
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* Copyright (C) Joel Fernandes (Google) <joel@joelfernandes.org>
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*/
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#include <linux/kallsyms.h>
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#include <linux/uaccess.h>
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#include <linux/module.h>
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#include <linux/ftrace.h>
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#include <linux/kprobes.h>
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#include "trace.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/preemptirq.h>
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#ifdef CONFIG_TRACE_IRQFLAGS
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/* Per-cpu variable to prevent redundant calls when IRQs already off */
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static DEFINE_PER_CPU(int, tracing_irq_cpu);
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/*
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* Like trace_hardirqs_on() but without the lockdep invocation. This is
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* used in the low level entry code where the ordering vs. RCU is important
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* and lockdep uses a staged approach which splits the lockdep hardirq
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* tracking into a RCU on and a RCU off section.
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*/
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void trace_hardirqs_on_prepare(void)
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{
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if (this_cpu_read(tracing_irq_cpu)) {
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if (!in_nmi())
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trace_irq_enable(CALLER_ADDR0, CALLER_ADDR1);
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tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1);
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this_cpu_write(tracing_irq_cpu, 0);
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}
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}
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EXPORT_SYMBOL(trace_hardirqs_on_prepare);
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NOKPROBE_SYMBOL(trace_hardirqs_on_prepare);
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void trace_hardirqs_on(void)
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{
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if (this_cpu_read(tracing_irq_cpu)) {
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if (!in_nmi())
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trace_irq_enable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
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tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1);
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this_cpu_write(tracing_irq_cpu, 0);
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}
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lockdep_hardirqs_on_prepare(CALLER_ADDR0);
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lockdep_hardirqs_on(CALLER_ADDR0);
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}
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EXPORT_SYMBOL(trace_hardirqs_on);
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NOKPROBE_SYMBOL(trace_hardirqs_on);
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/*
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* Like trace_hardirqs_off() but without the lockdep invocation. This is
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* used in the low level entry code where the ordering vs. RCU is important
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* and lockdep uses a staged approach which splits the lockdep hardirq
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* tracking into a RCU on and a RCU off section.
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*/
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void trace_hardirqs_off_finish(void)
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{
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if (!this_cpu_read(tracing_irq_cpu)) {
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this_cpu_write(tracing_irq_cpu, 1);
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tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1);
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if (!in_nmi())
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trace_irq_disable(CALLER_ADDR0, CALLER_ADDR1);
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}
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}
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EXPORT_SYMBOL(trace_hardirqs_off_finish);
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NOKPROBE_SYMBOL(trace_hardirqs_off_finish);
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void trace_hardirqs_off(void)
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{
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lockdep_hardirqs_off(CALLER_ADDR0);
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if (!this_cpu_read(tracing_irq_cpu)) {
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this_cpu_write(tracing_irq_cpu, 1);
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tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1);
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if (!in_nmi())
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trace_irq_disable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
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}
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}
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EXPORT_SYMBOL(trace_hardirqs_off);
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NOKPROBE_SYMBOL(trace_hardirqs_off);
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__visible void trace_hardirqs_on_caller(unsigned long caller_addr)
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{
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if (this_cpu_read(tracing_irq_cpu)) {
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if (!in_nmi())
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trace_irq_enable_rcuidle(CALLER_ADDR0, caller_addr);
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tracer_hardirqs_on(CALLER_ADDR0, caller_addr);
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this_cpu_write(tracing_irq_cpu, 0);
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}
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lockdep_hardirqs_on_prepare(CALLER_ADDR0);
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lockdep_hardirqs_on(CALLER_ADDR0);
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}
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EXPORT_SYMBOL(trace_hardirqs_on_caller);
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NOKPROBE_SYMBOL(trace_hardirqs_on_caller);
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__visible void trace_hardirqs_off_caller(unsigned long caller_addr)
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{
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lockdep_hardirqs_off(CALLER_ADDR0);
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if (!this_cpu_read(tracing_irq_cpu)) {
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this_cpu_write(tracing_irq_cpu, 1);
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tracer_hardirqs_off(CALLER_ADDR0, caller_addr);
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if (!in_nmi())
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trace_irq_disable_rcuidle(CALLER_ADDR0, caller_addr);
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}
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}
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EXPORT_SYMBOL(trace_hardirqs_off_caller);
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NOKPROBE_SYMBOL(trace_hardirqs_off_caller);
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#endif /* CONFIG_TRACE_IRQFLAGS */
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#ifdef CONFIG_TRACE_PREEMPT_TOGGLE
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void trace_preempt_on(unsigned long a0, unsigned long a1)
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{
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if (!in_nmi())
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trace_preempt_enable_rcuidle(a0, a1);
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tracer_preempt_on(a0, a1);
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}
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void trace_preempt_off(unsigned long a0, unsigned long a1)
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{
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if (!in_nmi())
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trace_preempt_disable_rcuidle(a0, a1);
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tracer_preempt_off(a0, a1);
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}
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#endif
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