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net/phy: add trace events for mdio accesses 

Make it possible to generate trace events for mdio read and write accesses.

Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Uwe Kleine-König 2016-11-22 16:47:11 +01:00 committed by David S. Miller
parent b911682318
commit e22e996b72
2 changed files with 53 additions and 0 deletions
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11
drivers/net/phy/mdio_bus.c
View File

@ -38,6 +38,9 @@
#include <asm/irq.h>
#define CREATE_TRACE_POINTS
#include <trace/events/mdio.h>
int mdiobus_register_device(struct mdio_device *mdiodev)
{
if (mdiodev->bus->mdio_map[mdiodev->addr])
@ -461,6 +464,8 @@ int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum)
retval = bus->read(bus, addr, regnum);
mutex_unlock(&bus->mdio_lock);
trace_mdio_access(bus, 1, addr, regnum, retval, retval);
return retval;
}
EXPORT_SYMBOL(mdiobus_read_nested);
@ -485,6 +490,8 @@ int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
retval = bus->read(bus, addr, regnum);
mutex_unlock(&bus->mdio_lock);
trace_mdio_access(bus, 1, addr, regnum, retval, retval);
return retval;
}
EXPORT_SYMBOL(mdiobus_read);
@ -513,6 +520,8 @@ int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val)
err = bus->write(bus, addr, regnum, val);
mutex_unlock(&bus->mdio_lock);
trace_mdio_access(bus, 0, addr, regnum, val, err);
return err;
}
EXPORT_SYMBOL(mdiobus_write_nested);
@ -538,6 +547,8 @@ int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
err = bus->write(bus, addr, regnum, val);
mutex_unlock(&bus->mdio_lock);
trace_mdio_access(bus, 0, addr, regnum, val, err);
return err;
}
EXPORT_SYMBOL(mdiobus_write);

42
include/trace/events/mdio.h Normal file
View File

@ -0,0 +1,42 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM mdio
#if !defined(_TRACE_MDIO_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_MDIO_H
#include <linux/tracepoint.h>
TRACE_EVENT_CONDITION(mdio_access,
TP_PROTO(struct mii_bus *bus, char read,
u8 addr, unsigned regnum, u16 val, int err),
TP_ARGS(bus, read, addr, regnum, val, err),
TP_CONDITION(err >= 0),
TP_STRUCT__entry(
__array(char, busid, MII_BUS_ID_SIZE)
__field(char, read)
__field(u8, addr)
__field(u16, val)
__field(unsigned, regnum)
),
TP_fast_assign(
strncpy(__entry->busid, bus->id, MII_BUS_ID_SIZE);
__entry->read = read;
__entry->addr = addr;
__entry->regnum = regnum;
__entry->val = val;
),
TP_printk("%s %-5s phy:0x%02hhx reg:0x%02x val:0x%04hx",
__entry->busid, __entry->read ? "read" : "write",
__entry->addr, __entry->regnum, __entry->val)
);
#endif /* if !defined(_TRACE_MDIO_H) || defined(TRACE_HEADER_MULTI_READ) */
/* This part must be outside protection */
#include <trace/define_trace.h>