summaryrefslogtreecommitdiffstats
path: root/kernel/trace/trace_preemptirq.c
blob: f4938040c2286e6be613ca34cd767bee5dcaaeae (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
// 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