// 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/irq_pipeline.h>
|
#include "trace.h"
|
|
#define CREATE_TRACE_POINTS
|
#include <trace/events/preemptirq.h>
|
#undef CREATE_TRACE_POINTS
|
#include <trace/hooks/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);
|
trace_android_rvh_irqs_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);
|
trace_android_rvh_irqs_enable(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);
|
trace_android_rvh_irqs_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);
|
trace_android_rvh_irqs_disable(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);
|
trace_android_rvh_irqs_enable(CALLER_ADDR0,
|
caller_addr);
|
}
|
tracer_hardirqs_on(CALLER_ADDR0, caller_addr);
|
this_cpu_write(tracing_irq_cpu, 0);
|
}
|
|
lockdep_hardirqs_on_prepare(caller_addr);
|
lockdep_hardirqs_on(caller_addr);
|
}
|
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_addr);
|
|
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);
|
trace_android_rvh_irqs_enable(CALLER_ADDR0,
|
caller_addr);
|
}
|
}
|
}
|
EXPORT_SYMBOL(trace_hardirqs_off_caller);
|
NOKPROBE_SYMBOL(trace_hardirqs_off_caller);
|
|
#ifdef CONFIG_IRQ_PIPELINE
|
|
void trace_hardirqs_off_pipelined(void)
|
{
|
WARN_ON(irq_pipeline_debug() && !hard_irqs_disabled());
|
|
if (running_inband())
|
trace_hardirqs_off();
|
}
|
EXPORT_SYMBOL(trace_hardirqs_off_pipelined);
|
NOKPROBE_SYMBOL(trace_hardirqs_off_pipelined);
|
|
void trace_hardirqs_on_pipelined(void)
|
{
|
WARN_ON(irq_pipeline_debug() && !hard_irqs_disabled());
|
|
/*
|
* If the in-band stage of the kernel is current but the IRQ
|
* was not delivered because the latter is stalled, keep the
|
* tracing logic unaware of the receipt, so that no false
|
* positive is triggered in lockdep (e.g. IN-HARDIRQ-W ->
|
* HARDIRQ-ON-W).
|
*/
|
if (running_inband() && !irqs_disabled()) {
|
stall_inband();
|
trace_hardirqs_on();
|
unstall_inband_nocheck();
|
}
|
}
|
EXPORT_SYMBOL(trace_hardirqs_on_pipelined);
|
NOKPROBE_SYMBOL(trace_hardirqs_on_pipelined);
|
|
#else
|
|
void trace_hardirqs_off_pipelined(void)
|
{
|
trace_hardirqs_off();
|
}
|
EXPORT_SYMBOL(trace_hardirqs_off_pipelined);
|
NOKPROBE_SYMBOL(trace_hardirqs_off_pipelined);
|
|
void trace_hardirqs_on_pipelined(void)
|
{
|
trace_hardirqs_on();
|
}
|
EXPORT_SYMBOL(trace_hardirqs_on_pipelined);
|
NOKPROBE_SYMBOL(trace_hardirqs_on_pipelined);
|
|
#endif
|
|
#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);
|
trace_android_rvh_preempt_enable(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);
|
trace_android_rvh_preempt_disable(a0, a1);
|
}
|
tracer_preempt_off(a0, a1);
|
}
|
#endif
|
