diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2021-05-17 14:29:46 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-06-15 17:14:36 +0200 |
| commit | 09705dcb63d269000595284b5dd7f5c938d647b9 (patch) | |
| tree | ea54f02454e42ee068b88ee891041574758ae76c /drivers/base/trace.h | |
| parent | devres: No need to call remove_nodes() when there none present (diff) | |
| download | linux-09705dcb63d269000595284b5dd7f5c938d647b9.tar.xz linux-09705dcb63d269000595284b5dd7f5c938d647b9.zip | |
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>
Diffstat (limited to 'drivers/base/trace.h')
| -rw-r--r-- | drivers/base/trace.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/base/trace.h b/drivers/base/trace.h new file mode 100644 index 000000000000..3192e18f877e --- /dev/null +++ b/drivers/base/trace.h @@ -0,0 +1,56 @@ +/* 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> |