mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-09-18 22:14:16 +00:00
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
|
|
/*
|
|
* 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>
|
|
|
|
#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)) {
|
|
if (!in_nmi())
|
|
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)) {
|
|
if (!in_nmi())
|
|
trace_irq_enable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
|
|
tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1);
|
|
this_cpu_write(tracing_irq_cpu, 0);
|
|
}
|
|
|
|
lockdep_hardirqs_on_prepare(CALLER_ADDR0);
|
|
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);
|
|
if (!in_nmi())
|
|
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);
|
|
if (!in_nmi())
|
|
trace_irq_disable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(trace_hardirqs_off);
|
|
NOKPROBE_SYMBOL(trace_hardirqs_off);
|
|
|
|
__visible void trace_hardirqs_on_caller(unsigned long caller_addr)
|
|
{
|
|
if (this_cpu_read(tracing_irq_cpu)) {
|
|
if (!in_nmi())
|
|
trace_irq_enable_rcuidle(CALLER_ADDR0, caller_addr);
|
|
tracer_hardirqs_on(CALLER_ADDR0, caller_addr);
|
|
this_cpu_write(tracing_irq_cpu, 0);
|
|
}
|
|
|
|
lockdep_hardirqs_on_prepare(CALLER_ADDR0);
|
|
lockdep_hardirqs_on(CALLER_ADDR0);
|
|
}
|
|
EXPORT_SYMBOL(trace_hardirqs_on_caller);
|
|
NOKPROBE_SYMBOL(trace_hardirqs_on_caller);
|
|
|
|
__visible void trace_hardirqs_off_caller(unsigned long caller_addr)
|
|
{
|
|
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_addr);
|
|
if (!in_nmi())
|
|
trace_irq_disable_rcuidle(CALLER_ADDR0, caller_addr);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(trace_hardirqs_off_caller);
|
|
NOKPROBE_SYMBOL(trace_hardirqs_off_caller);
|
|
#endif /* CONFIG_TRACE_IRQFLAGS */
|
|
|
|
#ifdef CONFIG_TRACE_PREEMPT_TOGGLE
|
|
|
|
void trace_preempt_on(unsigned long a0, unsigned long a1)
|
|
{
|
|
if (!in_nmi())
|
|
trace_preempt_enable_rcuidle(a0, a1);
|
|
tracer_preempt_on(a0, a1);
|
|
}
|
|
|
|
void trace_preempt_off(unsigned long a0, unsigned long a1)
|
|
{
|
|
if (!in_nmi())
|
|
trace_preempt_disable_rcuidle(a0, a1);
|
|
tracer_preempt_off(a0, a1);
|
|
}
|
|
#endif
|