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d714fb25e7
I2C slave events tracepoints can be enabled by: echo 1 > /sys/kernel/tracing/events/i2c_slave/enable and logs in /sys/kernel/tracing/trace will look like: ... i2c_slave: i2c-0 a=010 ret=0 WR_REQ [] ... i2c_slave: i2c-0 a=010 ret=0 WR_RCV [02] ... i2c_slave: i2c-0 a=010 ret=0 WR_RCV [0c] ... i2c_slave: i2c-0 a=010 ret=0 STOP [] ... i2c_slave: i2c-0 a=010 ret=0 RD_REQ [04] ... i2c_slave: i2c-0 a=010 ret=0 RD_PRO [b4] ... i2c_slave: i2c-0 a=010 ret=0 STOP [] formatted as: i2c-<adapter_nr> a=<addr> ret=<ret> <- callback return value <event> [<data>] trace printings can be selected by adding a filter like: echo adapter_nr==1 >/sys/kernel/tracing/events/i2c_slave/filter Signed-off-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* I2C slave tracepoints
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*
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* Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
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*/
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM i2c_slave
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#if !defined(_TRACE_I2C_SLAVE_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_I2C_SLAVE_H
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#include <linux/i2c.h>
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#include <linux/tracepoint.h>
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TRACE_DEFINE_ENUM(I2C_SLAVE_READ_REQUESTED);
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TRACE_DEFINE_ENUM(I2C_SLAVE_WRITE_REQUESTED);
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TRACE_DEFINE_ENUM(I2C_SLAVE_READ_PROCESSED);
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TRACE_DEFINE_ENUM(I2C_SLAVE_WRITE_RECEIVED);
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TRACE_DEFINE_ENUM(I2C_SLAVE_STOP);
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#define show_event_type(type) \
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__print_symbolic(type, \
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{ I2C_SLAVE_READ_REQUESTED, "RD_REQ" }, \
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{ I2C_SLAVE_WRITE_REQUESTED, "WR_REQ" }, \
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{ I2C_SLAVE_READ_PROCESSED, "RD_PRO" }, \
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{ I2C_SLAVE_WRITE_RECEIVED, "WR_RCV" }, \
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{ I2C_SLAVE_STOP, " STOP" })
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TRACE_EVENT(i2c_slave,
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TP_PROTO(const struct i2c_client *client, enum i2c_slave_event event,
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__u8 *val, int cb_ret),
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TP_ARGS(client, event, val, cb_ret),
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TP_STRUCT__entry(
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__field(int, adapter_nr )
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__field(int, ret )
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__field(__u16, addr )
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__field(__u16, len )
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__field(enum i2c_slave_event, event )
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__array(__u8, buf, 1) ),
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TP_fast_assign(
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__entry->adapter_nr = client->adapter->nr;
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__entry->addr = client->addr;
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__entry->event = event;
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__entry->ret = cb_ret;
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switch (event) {
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case I2C_SLAVE_READ_REQUESTED:
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case I2C_SLAVE_READ_PROCESSED:
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case I2C_SLAVE_WRITE_RECEIVED:
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__entry->len = 1;
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memcpy(__entry->buf, val, __entry->len);
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break;
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default:
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__entry->len = 0;
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break;
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}
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),
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TP_printk("i2c-%d a=%03x ret=%d %s [%*phD]",
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__entry->adapter_nr, __entry->addr, __entry->ret,
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show_event_type(__entry->event), __entry->len, __entry->buf
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));
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#endif /* _TRACE_I2C_SLAVE_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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