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09705dcb63
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>
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Device core Trace Support
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* Copyright (C) 2021, Intel Corporation
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*
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* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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*/
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM dev
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#if !defined(__DEV_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
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#define __DEV_TRACE_H
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#include <linux/device.h>
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#include <linux/tracepoint.h>
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#include <linux/types.h>
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DECLARE_EVENT_CLASS(devres,
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TP_PROTO(struct device *dev, const char *op, void *node, const char *name, size_t size),
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TP_ARGS(dev, op, node, name, size),
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TP_STRUCT__entry(
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__string(devname, dev_name(dev))
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__field(struct device *, dev)
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__field(const char *, op)
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__field(void *, node)
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__field(const char *, name)
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__field(size_t, size)
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),
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TP_fast_assign(
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__assign_str(devname, dev_name(dev));
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__entry->op = op;
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__entry->node = node;
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__entry->name = name;
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__entry->size = size;
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),
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TP_printk("%s %3s %p %s (%zu bytes)", __get_str(devname),
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__entry->op, __entry->node, __entry->name, __entry->size)
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);
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DEFINE_EVENT(devres, devres_log,
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TP_PROTO(struct device *dev, const char *op, void *node, const char *name, size_t size),
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TP_ARGS(dev, op, node, name, size)
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);
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#endif /* __DEV_TRACE_H */
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/* this part has to be here */
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#undef TRACE_INCLUDE_PATH
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#define TRACE_INCLUDE_PATH .
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#undef TRACE_INCLUDE_FILE
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#define TRACE_INCLUDE_FILE trace
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#include <trace/define_trace.h>
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