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d8434c3137
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>
250 lines
7.5 KiB
C
250 lines
7.5 KiB
C
/* SMBUS message transfer tracepoints
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*
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* Copyright (C) 2013 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM smbus
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#if !defined(_TRACE_SMBUS_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_SMBUS_H
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#include <linux/i2c.h>
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#include <linux/tracepoint.h>
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/*
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* drivers/i2c/i2c-core-smbus.c
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*/
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/*
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* i2c_smbus_xfer() write data or procedure call request
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*/
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TRACE_EVENT_CONDITION(smbus_write,
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TP_PROTO(const struct i2c_adapter *adap,
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u16 addr, unsigned short flags,
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char read_write, u8 command, int protocol,
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const union i2c_smbus_data *data),
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TP_ARGS(adap, addr, flags, read_write, command, protocol, data),
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TP_CONDITION(read_write == I2C_SMBUS_WRITE ||
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protocol == I2C_SMBUS_PROC_CALL ||
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protocol == I2C_SMBUS_BLOCK_PROC_CALL),
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TP_STRUCT__entry(
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__field(int, adapter_nr )
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__field(__u16, addr )
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__field(__u16, flags )
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__field(__u8, command )
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__field(__u8, len )
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__field(__u32, protocol )
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__array(__u8, buf, I2C_SMBUS_BLOCK_MAX + 2) ),
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TP_fast_assign(
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__entry->adapter_nr = adap->nr;
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__entry->addr = addr;
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__entry->flags = flags;
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__entry->command = command;
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__entry->protocol = protocol;
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switch (protocol) {
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case I2C_SMBUS_BYTE_DATA:
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__entry->len = 1;
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goto copy;
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case I2C_SMBUS_WORD_DATA:
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case I2C_SMBUS_PROC_CALL:
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__entry->len = 2;
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goto copy;
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case I2C_SMBUS_BLOCK_DATA:
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case I2C_SMBUS_BLOCK_PROC_CALL:
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case I2C_SMBUS_I2C_BLOCK_DATA:
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__entry->len = data->block[0] + 1;
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copy:
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memcpy(__entry->buf, data->block, __entry->len);
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break;
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case I2C_SMBUS_QUICK:
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case I2C_SMBUS_BYTE:
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case I2C_SMBUS_I2C_BLOCK_BROKEN:
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default:
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__entry->len = 0;
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}
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),
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TP_printk("i2c-%d a=%03x f=%04x c=%x %s l=%u [%*phD]",
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__entry->adapter_nr,
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__entry->addr,
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__entry->flags,
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__entry->command,
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__print_symbolic(__entry->protocol,
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{ I2C_SMBUS_QUICK, "QUICK" },
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{ I2C_SMBUS_BYTE, "BYTE" },
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{ I2C_SMBUS_BYTE_DATA, "BYTE_DATA" },
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{ I2C_SMBUS_WORD_DATA, "WORD_DATA" },
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{ I2C_SMBUS_PROC_CALL, "PROC_CALL" },
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{ I2C_SMBUS_BLOCK_DATA, "BLOCK_DATA" },
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{ I2C_SMBUS_I2C_BLOCK_BROKEN, "I2C_BLOCK_BROKEN" },
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{ I2C_SMBUS_BLOCK_PROC_CALL, "BLOCK_PROC_CALL" },
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{ I2C_SMBUS_I2C_BLOCK_DATA, "I2C_BLOCK_DATA" }),
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__entry->len,
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__entry->len, __entry->buf
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));
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/*
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* i2c_smbus_xfer() read data request
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*/
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TRACE_EVENT_CONDITION(smbus_read,
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TP_PROTO(const struct i2c_adapter *adap,
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u16 addr, unsigned short flags,
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char read_write, u8 command, int protocol),
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TP_ARGS(adap, addr, flags, read_write, command, protocol),
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TP_CONDITION(!(read_write == I2C_SMBUS_WRITE ||
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protocol == I2C_SMBUS_PROC_CALL ||
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protocol == I2C_SMBUS_BLOCK_PROC_CALL)),
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TP_STRUCT__entry(
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__field(int, adapter_nr )
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__field(__u16, flags )
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__field(__u16, addr )
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__field(__u8, command )
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__field(__u32, protocol )
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__array(__u8, buf, I2C_SMBUS_BLOCK_MAX + 2) ),
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TP_fast_assign(
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__entry->adapter_nr = adap->nr;
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__entry->addr = addr;
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__entry->flags = flags;
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__entry->command = command;
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__entry->protocol = protocol;
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),
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TP_printk("i2c-%d a=%03x f=%04x c=%x %s",
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__entry->adapter_nr,
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__entry->addr,
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__entry->flags,
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__entry->command,
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__print_symbolic(__entry->protocol,
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{ I2C_SMBUS_QUICK, "QUICK" },
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{ I2C_SMBUS_BYTE, "BYTE" },
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{ I2C_SMBUS_BYTE_DATA, "BYTE_DATA" },
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{ I2C_SMBUS_WORD_DATA, "WORD_DATA" },
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{ I2C_SMBUS_PROC_CALL, "PROC_CALL" },
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{ I2C_SMBUS_BLOCK_DATA, "BLOCK_DATA" },
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{ I2C_SMBUS_I2C_BLOCK_BROKEN, "I2C_BLOCK_BROKEN" },
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{ I2C_SMBUS_BLOCK_PROC_CALL, "BLOCK_PROC_CALL" },
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{ I2C_SMBUS_I2C_BLOCK_DATA, "I2C_BLOCK_DATA" })
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));
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/*
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* i2c_smbus_xfer() read data or procedure call reply
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*/
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TRACE_EVENT_CONDITION(smbus_reply,
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TP_PROTO(const struct i2c_adapter *adap,
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u16 addr, unsigned short flags,
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char read_write, u8 command, int protocol,
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const union i2c_smbus_data *data, int res),
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TP_ARGS(adap, addr, flags, read_write, command, protocol, data, res),
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TP_CONDITION(res >= 0 && read_write == I2C_SMBUS_READ),
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TP_STRUCT__entry(
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__field(int, adapter_nr )
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__field(__u16, addr )
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__field(__u16, flags )
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__field(__u8, command )
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__field(__u8, len )
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__field(__u32, protocol )
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__array(__u8, buf, I2C_SMBUS_BLOCK_MAX + 2) ),
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TP_fast_assign(
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__entry->adapter_nr = adap->nr;
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__entry->addr = addr;
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__entry->flags = flags;
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__entry->command = command;
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__entry->protocol = protocol;
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switch (protocol) {
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case I2C_SMBUS_BYTE:
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case I2C_SMBUS_BYTE_DATA:
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__entry->len = 1;
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goto copy;
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case I2C_SMBUS_WORD_DATA:
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case I2C_SMBUS_PROC_CALL:
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__entry->len = 2;
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goto copy;
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case I2C_SMBUS_BLOCK_DATA:
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case I2C_SMBUS_BLOCK_PROC_CALL:
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case I2C_SMBUS_I2C_BLOCK_DATA:
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__entry->len = data->block[0] + 1;
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copy:
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memcpy(__entry->buf, data->block, __entry->len);
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break;
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case I2C_SMBUS_QUICK:
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case I2C_SMBUS_I2C_BLOCK_BROKEN:
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default:
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__entry->len = 0;
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}
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),
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TP_printk("i2c-%d a=%03x f=%04x c=%x %s l=%u [%*phD]",
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__entry->adapter_nr,
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__entry->addr,
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__entry->flags,
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__entry->command,
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__print_symbolic(__entry->protocol,
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{ I2C_SMBUS_QUICK, "QUICK" },
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{ I2C_SMBUS_BYTE, "BYTE" },
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{ I2C_SMBUS_BYTE_DATA, "BYTE_DATA" },
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{ I2C_SMBUS_WORD_DATA, "WORD_DATA" },
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{ I2C_SMBUS_PROC_CALL, "PROC_CALL" },
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{ I2C_SMBUS_BLOCK_DATA, "BLOCK_DATA" },
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{ I2C_SMBUS_I2C_BLOCK_BROKEN, "I2C_BLOCK_BROKEN" },
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{ I2C_SMBUS_BLOCK_PROC_CALL, "BLOCK_PROC_CALL" },
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{ I2C_SMBUS_I2C_BLOCK_DATA, "I2C_BLOCK_DATA" }),
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__entry->len,
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__entry->len, __entry->buf
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));
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/*
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* i2c_smbus_xfer() result
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*/
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TRACE_EVENT(smbus_result,
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TP_PROTO(const struct i2c_adapter *adap,
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u16 addr, unsigned short flags,
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char read_write, u8 command, int protocol,
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int res),
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TP_ARGS(adap, addr, flags, read_write, command, protocol, res),
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TP_STRUCT__entry(
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__field(int, adapter_nr )
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__field(__u16, addr )
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__field(__u16, flags )
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__field(__u8, read_write )
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__field(__u8, command )
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__field(__s16, res )
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__field(__u32, protocol )
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),
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TP_fast_assign(
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__entry->adapter_nr = adap->nr;
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__entry->addr = addr;
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__entry->flags = flags;
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__entry->read_write = read_write;
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__entry->command = command;
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__entry->protocol = protocol;
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__entry->res = res;
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),
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TP_printk("i2c-%d a=%03x f=%04x c=%x %s %s res=%d",
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__entry->adapter_nr,
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__entry->addr,
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__entry->flags,
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__entry->command,
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__print_symbolic(__entry->protocol,
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{ I2C_SMBUS_QUICK, "QUICK" },
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{ I2C_SMBUS_BYTE, "BYTE" },
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{ I2C_SMBUS_BYTE_DATA, "BYTE_DATA" },
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{ I2C_SMBUS_WORD_DATA, "WORD_DATA" },
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{ I2C_SMBUS_PROC_CALL, "PROC_CALL" },
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{ I2C_SMBUS_BLOCK_DATA, "BLOCK_DATA" },
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{ I2C_SMBUS_I2C_BLOCK_BROKEN, "I2C_BLOCK_BROKEN" },
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{ I2C_SMBUS_BLOCK_PROC_CALL, "BLOCK_PROC_CALL" },
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{ I2C_SMBUS_I2C_BLOCK_DATA, "I2C_BLOCK_DATA" }),
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__entry->read_write == I2C_SMBUS_WRITE ? "wr" : "rd",
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__entry->res
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));
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#endif /* _TRACE_SMBUS_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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