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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * preemptoff and irqoff tracepoints
4 *
5 * Copyright (C) Joel Fernandes (Google) <joel@joelfernandes.org>
6 */
7
8#include <linux/kallsyms.h>
9#include <linux/uaccess.h>
10#include <linux/module.h>
11#include <linux/ftrace.h>
12#include <linux/kprobes.h>
13#include "trace.h"
14
15#define CREATE_TRACE_POINTS
16#include <trace/events/preemptirq.h>
17
18#ifdef CONFIG_TRACE_IRQFLAGS
19/* Per-cpu variable to prevent redundant calls when IRQs already off */
20static DEFINE_PER_CPU(int, tracing_irq_cpu);
21
22/*
23 * Like trace_hardirqs_on() but without the lockdep invocation. This is
24 * used in the low level entry code where the ordering vs. RCU is important
25 * and lockdep uses a staged approach which splits the lockdep hardirq
26 * tracking into a RCU on and a RCU off section.
27 */
28void trace_hardirqs_on_prepare(void)
29{
30 if (this_cpu_read(tracing_irq_cpu)) {
31 if (!in_nmi())
32 trace_irq_enable(CALLER_ADDR0, CALLER_ADDR1);
33 tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1);
34 this_cpu_write(tracing_irq_cpu, 0);
35 }
36}
37EXPORT_SYMBOL(trace_hardirqs_on_prepare);
38NOKPROBE_SYMBOL(trace_hardirqs_on_prepare);
39
40void trace_hardirqs_on(void)
41{
42 if (this_cpu_read(tracing_irq_cpu)) {
43 if (!in_nmi())
44 trace_irq_enable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
45 tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1);
46 this_cpu_write(tracing_irq_cpu, 0);
47 }
48
49 lockdep_hardirqs_on_prepare();
50 lockdep_hardirqs_on(CALLER_ADDR0);
51}
52EXPORT_SYMBOL(trace_hardirqs_on);
53NOKPROBE_SYMBOL(trace_hardirqs_on);
54
55/*
56 * Like trace_hardirqs_off() but without the lockdep invocation. This is
57 * used in the low level entry code where the ordering vs. RCU is important
58 * and lockdep uses a staged approach which splits the lockdep hardirq
59 * tracking into a RCU on and a RCU off section.
60 */
61void trace_hardirqs_off_finish(void)
62{
63 if (!this_cpu_read(tracing_irq_cpu)) {
64 this_cpu_write(tracing_irq_cpu, 1);
65 tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1);
66 if (!in_nmi())
67 trace_irq_disable(CALLER_ADDR0, CALLER_ADDR1);
68 }
69
70}
71EXPORT_SYMBOL(trace_hardirqs_off_finish);
72NOKPROBE_SYMBOL(trace_hardirqs_off_finish);
73
74void trace_hardirqs_off(void)
75{
76 lockdep_hardirqs_off(CALLER_ADDR0);
77
78 if (!this_cpu_read(tracing_irq_cpu)) {
79 this_cpu_write(tracing_irq_cpu, 1);
80 tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1);
81 if (!in_nmi())
82 trace_irq_disable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
83 }
84}
85EXPORT_SYMBOL(trace_hardirqs_off);
86NOKPROBE_SYMBOL(trace_hardirqs_off);
87
88__visible void trace_hardirqs_on_caller(unsigned long caller_addr)
89{
90 if (this_cpu_read(tracing_irq_cpu)) {
91 if (!in_nmi())
92 trace_irq_enable_rcuidle(CALLER_ADDR0, caller_addr);
93 tracer_hardirqs_on(CALLER_ADDR0, caller_addr);
94 this_cpu_write(tracing_irq_cpu, 0);
95 }
96
97 lockdep_hardirqs_on_prepare();
98 lockdep_hardirqs_on(caller_addr);
99}
100EXPORT_SYMBOL(trace_hardirqs_on_caller);
101NOKPROBE_SYMBOL(trace_hardirqs_on_caller);
102
103__visible void trace_hardirqs_off_caller(unsigned long caller_addr)
104{
105 lockdep_hardirqs_off(caller_addr);
106
107 if (!this_cpu_read(tracing_irq_cpu)) {
108 this_cpu_write(tracing_irq_cpu, 1);
109 tracer_hardirqs_off(CALLER_ADDR0, caller_addr);
110 if (!in_nmi())
111 trace_irq_disable_rcuidle(CALLER_ADDR0, caller_addr);
112 }
113}
114EXPORT_SYMBOL(trace_hardirqs_off_caller);
115NOKPROBE_SYMBOL(trace_hardirqs_off_caller);
116#endif /* CONFIG_TRACE_IRQFLAGS */
117
118#ifdef CONFIG_TRACE_PREEMPT_TOGGLE
119
120void trace_preempt_on(unsigned long a0, unsigned long a1)
121{
122 if (!in_nmi())
123 trace_preempt_enable_rcuidle(a0, a1);
124 tracer_preempt_on(a0, a1);
125}
126
127void trace_preempt_off(unsigned long a0, unsigned long a1)
128{
129 if (!in_nmi())
130 trace_preempt_disable_rcuidle(a0, a1);
131 tracer_preempt_off(a0, a1);
132}
133#endif
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * preemptoff and irqoff tracepoints
4 *
5 * Copyright (C) Joel Fernandes (Google) <joel@joelfernandes.org>
6 */
7
8#include <linux/kallsyms.h>
9#include <linux/uaccess.h>
10#include <linux/module.h>
11#include <linux/ftrace.h>
12#include <linux/kprobes.h>
13#include "trace.h"
14
15#define CREATE_TRACE_POINTS
16#include <trace/events/preemptirq.h>
17
18/*
19 * Use regular trace points on architectures that implement noinstr
20 * tooling: these calls will only happen with RCU enabled, which can
21 * use a regular tracepoint.
22 *
23 * On older architectures, use the rcuidle tracing methods (which
24 * aren't NMI-safe - so exclude NMI contexts):
25 */
26#ifdef CONFIG_ARCH_WANTS_NO_INSTR
27#define trace(point) trace_##point
28#else
29#define trace(point) if (!in_nmi()) trace_##point##_rcuidle
30#endif
31
32#ifdef CONFIG_TRACE_IRQFLAGS
33/* Per-cpu variable to prevent redundant calls when IRQs already off */
34static DEFINE_PER_CPU(int, tracing_irq_cpu);
35
36/*
37 * Like trace_hardirqs_on() but without the lockdep invocation. This is
38 * used in the low level entry code where the ordering vs. RCU is important
39 * and lockdep uses a staged approach which splits the lockdep hardirq
40 * tracking into a RCU on and a RCU off section.
41 */
42void trace_hardirqs_on_prepare(void)
43{
44 if (this_cpu_read(tracing_irq_cpu)) {
45 trace(irq_enable)(CALLER_ADDR0, CALLER_ADDR1);
46 tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1);
47 this_cpu_write(tracing_irq_cpu, 0);
48 }
49}
50EXPORT_SYMBOL(trace_hardirqs_on_prepare);
51NOKPROBE_SYMBOL(trace_hardirqs_on_prepare);
52
53void trace_hardirqs_on(void)
54{
55 if (this_cpu_read(tracing_irq_cpu)) {
56 trace(irq_enable)(CALLER_ADDR0, CALLER_ADDR1);
57 tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1);
58 this_cpu_write(tracing_irq_cpu, 0);
59 }
60
61 lockdep_hardirqs_on_prepare();
62 lockdep_hardirqs_on(CALLER_ADDR0);
63}
64EXPORT_SYMBOL(trace_hardirqs_on);
65NOKPROBE_SYMBOL(trace_hardirqs_on);
66
67/*
68 * Like trace_hardirqs_off() but without the lockdep invocation. This is
69 * used in the low level entry code where the ordering vs. RCU is important
70 * and lockdep uses a staged approach which splits the lockdep hardirq
71 * tracking into a RCU on and a RCU off section.
72 */
73void trace_hardirqs_off_finish(void)
74{
75 if (!this_cpu_read(tracing_irq_cpu)) {
76 this_cpu_write(tracing_irq_cpu, 1);
77 tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1);
78 trace(irq_disable)(CALLER_ADDR0, CALLER_ADDR1);
79 }
80
81}
82EXPORT_SYMBOL(trace_hardirqs_off_finish);
83NOKPROBE_SYMBOL(trace_hardirqs_off_finish);
84
85void trace_hardirqs_off(void)
86{
87 lockdep_hardirqs_off(CALLER_ADDR0);
88
89 if (!this_cpu_read(tracing_irq_cpu)) {
90 this_cpu_write(tracing_irq_cpu, 1);
91 tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1);
92 trace(irq_disable)(CALLER_ADDR0, CALLER_ADDR1);
93 }
94}
95EXPORT_SYMBOL(trace_hardirqs_off);
96NOKPROBE_SYMBOL(trace_hardirqs_off);
97#endif /* CONFIG_TRACE_IRQFLAGS */
98
99#ifdef CONFIG_TRACE_PREEMPT_TOGGLE
100
101void trace_preempt_on(unsigned long a0, unsigned long a1)
102{
103 trace(preempt_enable)(a0, a1);
104 tracer_preempt_on(a0, a1);
105}
106
107void trace_preempt_off(unsigned long a0, unsigned long a1)
108{
109 trace(preempt_disable)(a0, a1);
110 tracer_preempt_off(a0, a1);
111}
112#endif