[PATCH v2] net: phy: add tracepoints

[Tobias Waldekranz]

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@xxxxxxxxxxxxxx>
Acked-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
---
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