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linux/include/trace/events/i2c.h
David Howells 8a325997d9 i2c: Add message transfer tracepoints for SMBUS [ver #2] 
The SMBUS tracepoints can be enabled thusly:

	echo 1 >/sys/kernel/debug/tracing/events/i2c/enable

and will dump messages that can be viewed in /sys/kernel/debug/tracing/trace
that look like:

         ... smbus_read: i2c-0 a=051 f=0000 c=fa BYTE_DATA
         ... smbus_reply: i2c-0 a=051 f=0000 c=fa BYTE_DATA l=1 [39]
         ... smbus_result: i2c-0 a=051 f=0000 c=fa BYTE_DATA rd res=0

formatted as:

	i2c-<adapter-nr>
	a=<addr>
	f=<flags>
	c=<command>
	<protocol-name>
	<rd|wr>
	res=<result>
	l=<data-len>
	[<data-block>]

The adapters to be traced can be selected by something like:

	echo adapter_nr==1 >/sys/kernel/debug/tracing/events/i2c/filter

Note that this shares the same filter and enablement as i2c.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014-03-13 22:15:07 +01:00

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/* I2C and SMBUS message transfer tracepoints
*
* Copyright (C) 2013 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#undef TRACE_SYSTEM
#define TRACE_SYSTEM i2c
#if !defined(_TRACE_I2C_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_I2C_H
#include <linux/i2c.h>
#include <linux/tracepoint.h>
/*
* drivers/i2c/i2c-core.c
*/
extern void i2c_transfer_trace_reg(void);
extern void i2c_transfer_trace_unreg(void);
/*
* __i2c_transfer() write request
*/
TRACE_EVENT_FN(i2c_write,
TP_PROTO(const struct i2c_adapter *adap, const struct i2c_msg *msg,
int num),
TP_ARGS(adap, msg, num),
TP_STRUCT__entry(
__field(int, adapter_nr )
__field(__u16, msg_nr )
__field(__u16, addr )
__field(__u16, flags )
__field(__u16, len )
__dynamic_array(__u8, buf, msg->len) ),
TP_fast_assign(
__entry->adapter_nr = adap->nr;
__entry->msg_nr = num;
__entry->addr = msg->addr;
__entry->flags = msg->flags;
__entry->len = msg->len;
memcpy(__get_dynamic_array(buf), msg->buf, msg->len);
),
TP_printk("i2c-%d #%u a=%03x f=%04x l=%u [%*phD]",
__entry->adapter_nr,
__entry->msg_nr,
__entry->addr,
__entry->flags,
__entry->len,
__entry->len, __get_dynamic_array(buf)
),
i2c_transfer_trace_reg,
i2c_transfer_trace_unreg);
/*
* __i2c_transfer() read request
*/
TRACE_EVENT_FN(i2c_read,
TP_PROTO(const struct i2c_adapter *adap, const struct i2c_msg *msg,
int num),
TP_ARGS(adap, msg, num),
TP_STRUCT__entry(
__field(int, adapter_nr )
__field(__u16, msg_nr )
__field(__u16, addr )
__field(__u16, flags )
__field(__u16, len )
),
TP_fast_assign(
__entry->adapter_nr = adap->nr;
__entry->msg_nr = num;
__entry->addr = msg->addr;
__entry->flags = msg->flags;
__entry->len = msg->len;
),
TP_printk("i2c-%d #%u a=%03x f=%04x l=%u",
__entry->adapter_nr,
__entry->msg_nr,
__entry->addr,
__entry->flags,
__entry->len
),
i2c_transfer_trace_reg,
i2c_transfer_trace_unreg);
/*
* __i2c_transfer() read reply
*/
TRACE_EVENT_FN(i2c_reply,
TP_PROTO(const struct i2c_adapter *adap, const struct i2c_msg *msg,
int num),
TP_ARGS(adap, msg, num),
TP_STRUCT__entry(
__field(int, adapter_nr )
__field(__u16, msg_nr )
__field(__u16, addr )
__field(__u16, flags )
__field(__u16, len )
__dynamic_array(__u8, buf, msg->len) ),
TP_fast_assign(
__entry->adapter_nr = adap->nr;
__entry->msg_nr = num;
__entry->addr = msg->addr;
__entry->flags = msg->flags;
__entry->len = msg->len;
memcpy(__get_dynamic_array(buf), msg->buf, msg->len);
),
TP_printk("i2c-%d #%u a=%03x f=%04x l=%u [%*phD]",
__entry->adapter_nr,
__entry->msg_nr,
__entry->addr,
__entry->flags,
__entry->len,
__entry->len, __get_dynamic_array(buf)
),
i2c_transfer_trace_reg,
i2c_transfer_trace_unreg);
/*
* __i2c_transfer() result
*/
TRACE_EVENT_FN(i2c_result,
TP_PROTO(const struct i2c_adapter *adap, int num, int ret),
TP_ARGS(adap, num, ret),
TP_STRUCT__entry(
__field(int, adapter_nr )
__field(__u16, nr_msgs )
__field(__s16, ret )
),
TP_fast_assign(
__entry->adapter_nr = adap->nr;
__entry->nr_msgs = num;
__entry->ret = ret;
),
TP_printk("i2c-%d n=%u ret=%d",
__entry->adapter_nr,
__entry->nr_msgs,
__entry->ret
),
i2c_transfer_trace_reg,
i2c_transfer_trace_unreg);
/*
* i2c_smbus_xfer() write data or procedure call request
*/
TRACE_EVENT_CONDITION(smbus_write,
TP_PROTO(const struct i2c_adapter *adap,
u16 addr, unsigned short flags,
char read_write, u8 command, int protocol,
const union i2c_smbus_data *data),
TP_ARGS(adap, addr, flags, read_write, command, protocol, data),
TP_CONDITION(read_write == I2C_SMBUS_WRITE ||
protocol == I2C_SMBUS_PROC_CALL ||
protocol == I2C_SMBUS_BLOCK_PROC_CALL),
TP_STRUCT__entry(
__field(int, adapter_nr )
__field(__u16, addr )
__field(__u16, flags )
__field(__u8, command )
__field(__u8, len )
__field(__u32, protocol )
__array(__u8, buf, I2C_SMBUS_BLOCK_MAX + 2) ),
TP_fast_assign(
__entry->adapter_nr = adap->nr;
__entry->addr = addr;
__entry->flags = flags;
__entry->command = command;
__entry->protocol = protocol;
switch (protocol) {
case I2C_SMBUS_BYTE_DATA:
__entry->len = 1;
goto copy;
case I2C_SMBUS_WORD_DATA:
case I2C_SMBUS_PROC_CALL:
__entry->len = 2;
goto copy;
case I2C_SMBUS_BLOCK_DATA:
case I2C_SMBUS_BLOCK_PROC_CALL:
case I2C_SMBUS_I2C_BLOCK_DATA:
__entry->len = data->block[0] + 1;
copy:
memcpy(__entry->buf, data->block, __entry->len);
break;
case I2C_SMBUS_QUICK:
case I2C_SMBUS_BYTE:
case I2C_SMBUS_I2C_BLOCK_BROKEN:
default:
__entry->len = 0;
}
),
TP_printk("i2c-%d a=%03x f=%04x c=%x %s l=%u [%*phD]",
__entry->adapter_nr,
__entry->addr,
__entry->flags,
__entry->command,
__print_symbolic(__entry->protocol,
{ I2C_SMBUS_QUICK, "QUICK" },
{ I2C_SMBUS_BYTE, "BYTE" },
{ I2C_SMBUS_BYTE_DATA, "BYTE_DATA" },
{ I2C_SMBUS_WORD_DATA, "WORD_DATA" },
{ I2C_SMBUS_PROC_CALL, "PROC_CALL" },
{ I2C_SMBUS_BLOCK_DATA, "BLOCK_DATA" },
{ I2C_SMBUS_I2C_BLOCK_BROKEN, "I2C_BLOCK_BROKEN" },
{ I2C_SMBUS_BLOCK_PROC_CALL, "BLOCK_PROC_CALL" },
{ I2C_SMBUS_I2C_BLOCK_DATA, "I2C_BLOCK_DATA" }),
__entry->len,
__entry->len, __entry->buf
));
/*
* i2c_smbus_xfer() read data request
*/
TRACE_EVENT_CONDITION(smbus_read,
TP_PROTO(const struct i2c_adapter *adap,
u16 addr, unsigned short flags,
char read_write, u8 command, int protocol),
TP_ARGS(adap, addr, flags, read_write, command, protocol),
TP_CONDITION(!(read_write == I2C_SMBUS_WRITE ||
protocol == I2C_SMBUS_PROC_CALL ||
protocol == I2C_SMBUS_BLOCK_PROC_CALL)),
TP_STRUCT__entry(
__field(int, adapter_nr )
__field(__u16, flags )
__field(__u16, addr )
__field(__u8, command )
__field(__u32, protocol )
__array(__u8, buf, I2C_SMBUS_BLOCK_MAX + 2) ),
TP_fast_assign(
__entry->adapter_nr = adap->nr;
__entry->addr = addr;
__entry->flags = flags;
__entry->command = command;
__entry->protocol = protocol;
),
TP_printk("i2c-%d a=%03x f=%04x c=%x %s",
__entry->adapter_nr,
__entry->addr,
__entry->flags,
__entry->command,
__print_symbolic(__entry->protocol,
{ I2C_SMBUS_QUICK, "QUICK" },
{ I2C_SMBUS_BYTE, "BYTE" },
{ I2C_SMBUS_BYTE_DATA, "BYTE_DATA" },
{ I2C_SMBUS_WORD_DATA, "WORD_DATA" },
{ I2C_SMBUS_PROC_CALL, "PROC_CALL" },
{ I2C_SMBUS_BLOCK_DATA, "BLOCK_DATA" },
{ I2C_SMBUS_I2C_BLOCK_BROKEN, "I2C_BLOCK_BROKEN" },
{ I2C_SMBUS_BLOCK_PROC_CALL, "BLOCK_PROC_CALL" },
{ I2C_SMBUS_I2C_BLOCK_DATA, "I2C_BLOCK_DATA" })
));
/*
* i2c_smbus_xfer() read data or procedure call reply
*/
TRACE_EVENT_CONDITION(smbus_reply,
TP_PROTO(const struct i2c_adapter *adap,
u16 addr, unsigned short flags,
char read_write, u8 command, int protocol,
const union i2c_smbus_data *data),
TP_ARGS(adap, addr, flags, read_write, command, protocol, data),
TP_CONDITION(read_write == I2C_SMBUS_READ),
TP_STRUCT__entry(
__field(int, adapter_nr )
__field(__u16, addr )
__field(__u16, flags )
__field(__u8, command )
__field(__u8, len )
__field(__u32, protocol )
__array(__u8, buf, I2C_SMBUS_BLOCK_MAX + 2) ),
TP_fast_assign(
__entry->adapter_nr = adap->nr;
__entry->addr = addr;
__entry->flags = flags;
__entry->command = command;
__entry->protocol = protocol;
switch (protocol) {
case I2C_SMBUS_BYTE:
case I2C_SMBUS_BYTE_DATA:
__entry->len = 1;
goto copy;
case I2C_SMBUS_WORD_DATA:
case I2C_SMBUS_PROC_CALL:
__entry->len = 2;
goto copy;
case I2C_SMBUS_BLOCK_DATA:
case I2C_SMBUS_BLOCK_PROC_CALL:
case I2C_SMBUS_I2C_BLOCK_DATA:
__entry->len = data->block[0] + 1;
copy:
memcpy(__entry->buf, data->block, __entry->len);
break;
case I2C_SMBUS_QUICK:
case I2C_SMBUS_I2C_BLOCK_BROKEN:
default:
__entry->len = 0;
}
),
TP_printk("i2c-%d a=%03x f=%04x c=%x %s l=%u [%*phD]",
__entry->adapter_nr,
__entry->addr,
__entry->flags,
__entry->command,
__print_symbolic(__entry->protocol,
{ I2C_SMBUS_QUICK, "QUICK" },
{ I2C_SMBUS_BYTE, "BYTE" },
{ I2C_SMBUS_BYTE_DATA, "BYTE_DATA" },
{ I2C_SMBUS_WORD_DATA, "WORD_DATA" },
{ I2C_SMBUS_PROC_CALL, "PROC_CALL" },
{ I2C_SMBUS_BLOCK_DATA, "BLOCK_DATA" },
{ I2C_SMBUS_I2C_BLOCK_BROKEN, "I2C_BLOCK_BROKEN" },
{ I2C_SMBUS_BLOCK_PROC_CALL, "BLOCK_PROC_CALL" },
{ I2C_SMBUS_I2C_BLOCK_DATA, "I2C_BLOCK_DATA" }),
__entry->len,
__entry->len, __entry->buf
));
/*
* i2c_smbus_xfer() result
*/
TRACE_EVENT(smbus_result,
TP_PROTO(const struct i2c_adapter *adap,
u16 addr, unsigned short flags,
char read_write, u8 command, int protocol,
int res),
TP_ARGS(adap, addr, flags, read_write, command, protocol, res),
TP_STRUCT__entry(
__field(int, adapter_nr )
__field(__u16, addr )
__field(__u16, flags )
__field(__u8, read_write )
__field(__u8, command )
__field(__s16, res )
__field(__u32, protocol )
),
TP_fast_assign(
__entry->adapter_nr = adap->nr;
__entry->addr = addr;
__entry->flags = flags;
__entry->read_write = read_write;
__entry->command = command;
__entry->protocol = protocol;
__entry->res = res;
),
TP_printk("i2c-%d a=%03x f=%04x c=%x %s %s res=%d",
__entry->adapter_nr,
__entry->addr,
__entry->flags,
__entry->command,
__print_symbolic(__entry->protocol,
{ I2C_SMBUS_QUICK, "QUICK" },
{ I2C_SMBUS_BYTE, "BYTE" },
{ I2C_SMBUS_BYTE_DATA, "BYTE_DATA" },
{ I2C_SMBUS_WORD_DATA, "WORD_DATA" },
{ I2C_SMBUS_PROC_CALL, "PROC_CALL" },
{ I2C_SMBUS_BLOCK_DATA, "BLOCK_DATA" },
{ I2C_SMBUS_I2C_BLOCK_BROKEN, "I2C_BLOCK_BROKEN" },
{ I2C_SMBUS_BLOCK_PROC_CALL, "BLOCK_PROC_CALL" },
{ I2C_SMBUS_I2C_BLOCK_DATA, "I2C_BLOCK_DATA" }),
__entry->read_write == I2C_SMBUS_WRITE ? "wr" : "rd",
__entry->res
));
#endif /* _TRACE_I2C_H */
/* This part must be outside protection */
#include <trace/define_trace.h>
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