Pull trace event headers into lttng modules tree

[lttng-modules.git] / instrumentation / events / lttng-module / irq.h

diff --git a/instrumentation/events/lttng-module/irq.h b/instrumentation/events/lttng-module/irq.h
new file mode 100644 (file)
index 0000000..ac590c9
--- /dev/null
+++ b/instrumentation/events/lttng-module/irq.h
@@ -0,0 +1,155 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM irq
+
+#if !defined(_TRACE_IRQ_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_IRQ_H
+
+#include <linux/tracepoint.h>
+
+#ifndef _TRACE_IRQ_DEF_
+#define _TRACE_IRQ_DEF_
+
+struct irqaction;
+struct softirq_action;
+
+#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(BLOCK_IOPOLL),    \
+                        softirq_name(TASKLET),         \
+                        softirq_name(SCHED),           \
+                        softirq_name(HRTIMER),         \
+                        softirq_name(RCU))
+
+#endif /* _TRACE_IRQ_DEF_ */
+
+/**
+ * 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(
+               tp_assign(irq, irq)
+               tp_strcpy(name, action->name)
+       ),
+
+       TP_printk("irq=%d name=%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(
+               tp_assign(irq, irq)
+               tp_assign(ret, ret)
+       ),
+
+       TP_printk("irq=%d ret=%s",
+                 __entry->irq, __entry->ret ? "handled" : "unhandled")
+)
+
+DECLARE_EVENT_CLASS(softirq,
+
+       TP_PROTO(unsigned int vec_nr),
+
+       TP_ARGS(vec_nr),
+
+       TP_STRUCT__entry(
+               __field(        unsigned int,   vec     )
+       ),
+
+       TP_fast_assign(
+               tp_assign(vec, vec_nr)
+       ),
+
+       TP_printk("vec=%u [action=%s]", __entry->vec,
+                 show_softirq_name(__entry->vec))
+)
+
+/**
+ * softirq_entry - called immediately before the softirq handler
+ * @vec_nr:  softirq vector number
+ *
+ * When used in combination with the softirq_exit tracepoint
+ * we can determine the softirq handler runtine.
+ */
+DEFINE_EVENT(softirq, softirq_entry,
+
+       TP_PROTO(unsigned int vec_nr),
+
+       TP_ARGS(vec_nr)
+)
+
+/**
+ * softirq_exit - called immediately after the softirq handler returns
+ * @vec_nr:  softirq vector number
+ *
+ * When used in combination with the softirq_entry tracepoint
+ * we can determine the softirq handler runtine.
+ */
+DEFINE_EVENT(softirq, softirq_exit,
+
+       TP_PROTO(unsigned int vec_nr),
+
+       TP_ARGS(vec_nr)
+)
+
+/**
+ * softirq_raise - called immediately when a softirq is raised
+ * @vec_nr:  softirq vector number
+ *
+ * When used in combination with the softirq_entry tracepoint
+ * we can determine the softirq raise to run latency.
+ */
+DEFINE_EVENT(softirq, softirq_raise,
+
+       TP_PROTO(unsigned int vec_nr),
+
+       TP_ARGS(vec_nr)
+)
+
+#endif /*  _TRACE_IRQ_H */
+
+/* This part must be outside protection */
+#include "define_trace.h"