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Subject[PATCH v2] net: phy: add tracepoints
Date
Two tracepoints for now:

* `phy_interrupt` Pretty self-explanatory.

* `phy_state_change` Whenever the PHY's state machine is run, trace
the old and the new state.

Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
v1 -> v2:
* Actually include the entire patch, based on current net-next.
* Pretty print the PHY's state according to Steven's suggestion.
---
drivers/net/phy/phy.c | 8 ++-
include/trace/events/phy.h | 100 +++++++++++++++++++++++++++++++++++++
2 files changed, 107 insertions(+), 1 deletion(-)
create mode 100644 include/trace/events/phy.h

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 1ee25877c4d1..74fc7151802c 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -38,6 +38,9 @@

#include <asm/irq.h>

+#define CREATE_TRACE_POINTS
+#include <trace/events/phy.h>
+
#define PHY_STATE_STR(_state) \
case PHY_##_state: \
return __stringify(_state); \
@@ -783,6 +786,7 @@ static irqreturn_t phy_interrupt(int irq, void *phy_dat)
if (PHY_HALTED == phydev->state)
return IRQ_NONE; /* It can't be ours. */

+ trace_phy_interrupt(irq, phydev);
return phy_change(phydev);
}

@@ -1114,10 +1118,12 @@ void phy_state_machine(struct work_struct *work)
if (err < 0)
phy_error(phydev);

- if (old_state != phydev->state)
+ if (old_state != phydev->state) {
+ trace_phy_state_change(phydev, old_state);
phydev_dbg(phydev, "PHY state change %s -> %s\n",
phy_state_to_str(old_state),
phy_state_to_str(phydev->state));
+ }

/* Only re-schedule a PHY state machine change if we are polling the
* PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving
diff --git a/include/trace/events/phy.h b/include/trace/events/phy.h
new file mode 100644
index 000000000000..c5a0c5739d4a
--- /dev/null
+++ b/include/trace/events/phy.h
@@ -0,0 +1,100 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM phy
+
+#if !defined(_TRACE_PHY_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_PHY_H
+
+#include <linux/tracepoint.h>
+
+#define PHY_STATE_ENUMS \
+ EM( DOWN ) \
+ EM( STARTING ) \
+ EM( READY ) \
+ EM( PENDING ) \
+ EM( UP ) \
+ EM( AN ) \
+ EM( RUNNING ) \
+ EM( NOLINK ) \
+ EM( FORCING ) \
+ EM( CHANGELINK )\
+ EM( HALTED ) \
+ EMe(RESUMING)
+
+#undef EM
+#undef EMe
+
+#define EM(a) TRACE_DEFINE_ENUM( PHY_##a );
+#define EMe(a) TRACE_DEFINE_ENUM( PHY_##a );
+
+PHY_STATE_ENUMS
+
+#undef EM
+#undef EMe
+
+#define EM(a) { PHY_##a, #a },
+#define EMe(a) { PHY_##a, #a }
+
+TRACE_EVENT(phy_interrupt,
+ TP_PROTO(int irq, struct phy_device *phydev),
+ TP_ARGS(irq, phydev),
+ TP_STRUCT__entry(
+ __field(int, irq)
+ __field(int, addr)
+ __field(int, state)
+ __array(char, ifname, IFNAMSIZ)
+ ),
+ TP_fast_assign(
+ __entry->irq = irq;
+ __entry->addr = phydev->mdio.addr;
+ __entry->state = phydev->state;
+ if (phydev->attached_dev)
+ memcpy(__entry->ifname,
+ netdev_name(phydev->attached_dev),
+ IFNAMSIZ);
+ else
+ memset(__entry->ifname, 0, IFNAMSIZ);
+ ),
+ TP_printk("phy-%d-irq irq=%d ifname=%-.16s state=%s",
+ __entry->addr,
+ __entry->irq,
+ __entry->ifname,
+ __print_symbolic(__entry->state, PHY_STATE_ENUMS)
+ )
+ );
+
+TRACE_EVENT(phy_state_change,
+ TP_PROTO(struct phy_device *phydev, enum phy_state old_state),
+ TP_ARGS(phydev, old_state),
+ TP_STRUCT__entry(
+ __field(int, addr)
+ __field(int, state)
+ __field(int, old_state)
+ __array(char, ifname, IFNAMSIZ)
+ ),
+ TP_fast_assign(
+ __entry->addr = phydev->mdio.addr;
+ __entry->state = phydev->state;
+ __entry->old_state = old_state;
+ if (phydev->attached_dev)
+ memcpy(__entry->ifname,
+ netdev_name(phydev->attached_dev),
+ IFNAMSIZ);
+ else
+ memset(__entry->ifname, 0, IFNAMSIZ);
+ ),
+ TP_printk("phy-%d-change ifname=%-.16s old_state=%s state=%s",
+ __entry->addr,
+ __entry->ifname,
+ __print_symbolic(__entry->old_state, PHY_STATE_ENUMS),
+ __print_symbolic(__entry->state, PHY_STATE_ENUMS)
+ )
+ );
+
+#undef EM
+#undef EMe
+#undef PHY_STATE_ENUMS
+
+#endif /* _TRACE_PHY_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
--
2.17.1
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