Merge tag '4.3-rc-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6
[sfrench/cifs-2.6.git] / kernel / trace / trace_preemptirq.c
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 */
20 static DEFINE_PER_CPU(int, tracing_irq_cpu);
21
22 void trace_hardirqs_on(void)
23 {
24         if (this_cpu_read(tracing_irq_cpu)) {
25                 if (!in_nmi())
26                         trace_irq_enable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
27                 tracer_hardirqs_on(CALLER_ADDR0, CALLER_ADDR1);
28                 this_cpu_write(tracing_irq_cpu, 0);
29         }
30
31         lockdep_hardirqs_on(CALLER_ADDR0);
32 }
33 EXPORT_SYMBOL(trace_hardirqs_on);
34 NOKPROBE_SYMBOL(trace_hardirqs_on);
35
36 void trace_hardirqs_off(void)
37 {
38         if (!this_cpu_read(tracing_irq_cpu)) {
39                 this_cpu_write(tracing_irq_cpu, 1);
40                 tracer_hardirqs_off(CALLER_ADDR0, CALLER_ADDR1);
41                 if (!in_nmi())
42                         trace_irq_disable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
43         }
44
45         lockdep_hardirqs_off(CALLER_ADDR0);
46 }
47 EXPORT_SYMBOL(trace_hardirqs_off);
48 NOKPROBE_SYMBOL(trace_hardirqs_off);
49
50 __visible void trace_hardirqs_on_caller(unsigned long caller_addr)
51 {
52         if (this_cpu_read(tracing_irq_cpu)) {
53                 if (!in_nmi())
54                         trace_irq_enable_rcuidle(CALLER_ADDR0, caller_addr);
55                 tracer_hardirqs_on(CALLER_ADDR0, caller_addr);
56                 this_cpu_write(tracing_irq_cpu, 0);
57         }
58
59         lockdep_hardirqs_on(CALLER_ADDR0);
60 }
61 EXPORT_SYMBOL(trace_hardirqs_on_caller);
62 NOKPROBE_SYMBOL(trace_hardirqs_on_caller);
63
64 __visible void trace_hardirqs_off_caller(unsigned long caller_addr)
65 {
66         if (!this_cpu_read(tracing_irq_cpu)) {
67                 this_cpu_write(tracing_irq_cpu, 1);
68                 tracer_hardirqs_off(CALLER_ADDR0, caller_addr);
69                 if (!in_nmi())
70                         trace_irq_disable_rcuidle(CALLER_ADDR0, caller_addr);
71         }
72
73         lockdep_hardirqs_off(CALLER_ADDR0);
74 }
75 EXPORT_SYMBOL(trace_hardirqs_off_caller);
76 NOKPROBE_SYMBOL(trace_hardirqs_off_caller);
77 #endif /* CONFIG_TRACE_IRQFLAGS */
78
79 #ifdef CONFIG_TRACE_PREEMPT_TOGGLE
80
81 void trace_preempt_on(unsigned long a0, unsigned long a1)
82 {
83         if (!in_nmi())
84                 trace_preempt_enable_rcuidle(a0, a1);
85         tracer_preempt_on(a0, a1);
86 }
87
88 void trace_preempt_off(unsigned long a0, unsigned long a1)
89 {
90         if (!in_nmi())
91                 trace_preempt_disable_rcuidle(a0, a1);
92         tracer_preempt_off(a0, a1);
93 }
94 #endif