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linux_dsm_epyc7002/include/trace/events/smbus.h
John Sperbeck d8434c3137 i2c: core-smbus: don't trace smbus_reply data on errors 
If an smbus transfer fails, there's no guarantee that the output
buffer was written.  So, avoid trying to show the output buffer when
tracing after an error.  This was 'mostly harmless', but would trip
up kasan checking if left-over cruft in byte 0 is a large length,
causing us to read from unwritten memory.

Signed-off-by: John Sperbeck <jsperbeck@google.com>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2019-02-14 18:01:33 +01:00

250 lines
7.5 KiB
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/* 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 smbus
#if !defined(_TRACE_SMBUS_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_SMBUS_H
#include <linux/i2c.h>
#include <linux/tracepoint.h>
/*
* drivers/i2c/i2c-core-smbus.c
*/
/*
* 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, int res),
TP_ARGS(adap, addr, flags, read_write, command, protocol, data, res),
TP_CONDITION(res >= 0 && 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_SMBUS_H */
/* This part must be outside protection */
#include <trace/define_trace.h>
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