linux-stable/drivers/base/trace.h
Andy Shevchenko 09705dcb63 devres: Enable trace events
In some cases the printf() mechanism is too heavy and can't be used.
For example, when debugging a race condition involving devres API.
When CONFIG_DEBUG_DEVRES is enabled I can't reproduce an issue, and
otherwise it's quite visible with a useful information being collected.

Enable trace events for devres part of the driver core.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210517122946.53161-4-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-06-15 17:14:36 +02:00

56 lines
1.4 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
/*
* Device core Trace Support
* Copyright (C) 2021, Intel Corporation
*
* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
*/
#undef TRACE_SYSTEM
#define TRACE_SYSTEM dev
#if !defined(__DEV_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
#define __DEV_TRACE_H
#include <linux/device.h>
#include <linux/tracepoint.h>
#include <linux/types.h>
DECLARE_EVENT_CLASS(devres,
TP_PROTO(struct device *dev, const char *op, void *node, const char *name, size_t size),
TP_ARGS(dev, op, node, name, size),
TP_STRUCT__entry(
__string(devname, dev_name(dev))
__field(struct device *, dev)
__field(const char *, op)
__field(void *, node)
__field(const char *, name)
__field(size_t, size)
),
TP_fast_assign(
__assign_str(devname, dev_name(dev));
__entry->op = op;
__entry->node = node;
__entry->name = name;
__entry->size = size;
),
TP_printk("%s %3s %p %s (%zu bytes)", __get_str(devname),
__entry->op, __entry->node, __entry->name, __entry->size)
);
DEFINE_EVENT(devres, devres_log,
TP_PROTO(struct device *dev, const char *op, void *node, const char *name, size_t size),
TP_ARGS(dev, op, node, name, size)
);
#endif /* __DEV_TRACE_H */
/* this part has to be here */
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH .
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE trace
#include <trace/define_trace.h>