aboutsummaryrefslogtreecommitdiff
path: root/include/trace/events/irq.h
blob: b0c7ede55eb156c0d4880dee2555dc4b35577887 (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
134
135
136
137
138
139
140
141
142
143
144
145
#if !defined(_TRACE_IRQ_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_IRQ_H

#include <linux/tracepoint.h>
#include <linux/interrupt.h>

#undef TRACE_SYSTEM
#define TRACE_SYSTEM irq

#define softirq_name(sirq) { sirq##_SOFTIRQ, #sirq }
#define show_softirq_name(val)			\
	__print_symbolic(val,			\
			 softirq_name(HI),	\
			 softirq_name(TIMER),	\
			 softirq_name(NET_TX),	\
			 softirq_name(NET_RX),	\
			 softirq_name(BLOCK),	\
			 softirq_name(TASKLET),	\
			 softirq_name(SCHED),	\
			 softirq_name(HRTIMER),	\
			 softirq_name(RCU))

/**
 * irq_handler_entry - called immediately before the irq action handler
 * @irq: irq number
 * @action: pointer to struct irqaction
 *
 * The struct irqaction pointed to by @action contains various
 * information about the handler, including the device name,
 * @action->name, and the device id, @action->dev_id. When used in
 * conjunction with the irq_handler_exit tracepoint, we can figure
 * out irq handler latencies.
 */
TRACE_EVENT(irq_handler_entry,

	TP_PROTO(int irq, struct irqaction *action),

	TP_ARGS(irq, action),

	TP_STRUCT__entry(
		__field(	int,	irq		)
		__string(	name,	action->name	)
	),

	TP_fast_assign(
		__entry->irq = irq;
		__assign_str(name, action->name);
	),

	TP_printk("irq=%d handler=%s", __entry->irq, __get_str(name))
);

/**
 * irq_handler_exit - called immediately after the irq action handler returns
 * @irq: irq number
 * @action: pointer to struct irqaction
 * @ret: return value
 *
 * If the @ret value is set to IRQ_HANDLED, then we know that the corresponding
 * @action->handler scuccessully handled this irq. Otherwise, the irq might be
 * a shared irq line, or the irq was not handled successfully. Can be used in
 * conjunction with the irq_handler_entry to understand irq handler latencies.
 */
TRACE_EVENT(irq_handler_exit,

	TP_PROTO(int irq, struct irqaction *action, int ret),

	TP_ARGS(irq, action, ret),

	TP_STRUCT__entry(
		__field(	int,	irq	)
		__field(	int,	ret	)
	),

	TP_fast_assign(
		__entry->irq	= irq;
		__entry->ret	= ret;
	),

	TP_printk("irq=%d return=%s",
		  __entry->irq, __entry->ret ? "handled" : "unhandled")
);

/**
 * softirq_entry - called immediately before the softirq handler
 * @h: pointer to struct softirq_action
 * @vec: pointer to first struct softirq_action in softirq_vec array
 *
 * The @h parameter, contains a pointer to the struct softirq_action
 * which has a pointer to the action handler that is called. By subtracting
 * the @vec pointer from the @h pointer, we can determine the softirq
 * number. Also, when used in combination with the softirq_exit tracepoint
 * we can determine the softirq latency.
 */
TRACE_EVENT(softirq_entry,

	TP_PROTO(struct softirq_action *h, struct softirq_action *vec),

	TP_ARGS(h, vec),

	TP_STRUCT__entry(
		__field(	int,	vec			)
	),

	TP_fast_assign(
		__entry->vec = (int)(h - vec);
	),

	TP_printk("softirq=%d action=%s", __entry->vec,
		  show_softirq_name(__entry->vec))
);

/**
 * softirq_exit - called immediately after the softirq handler returns
 * @h: pointer to struct softirq_action
 * @vec: pointer to first struct softirq_action in softirq_vec array
 *
 * The @h parameter contains a pointer to the struct softirq_action
 * that has handled the softirq. By subtracting the @vec pointer from
 * the @h pointer, we can determine the softirq number. Also, when used in
 * combination with the softirq_entry tracepoint we can determine the softirq
 * latency.
 */
TRACE_EVENT(softirq_exit,

	TP_PROTO(struct softirq_action *h, struct softirq_action *vec),

	TP_ARGS(h, vec),

	TP_STRUCT__entry(
		__field(	int,	vec			)
	),

	TP_fast_assign(
		__entry->vec = (int)(h - vec);
	),

	TP_printk("softirq=%d action=%s", __entry->vec,
		  show_softirq_name(__entry->vec))
);

#endif /*  _TRACE_IRQ_H */

/* This part must be outside protection */
#include <trace/define_trace.h>