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Message-Id: <20210401212129.82552-1-andriy.shevchenko@linux.intel.com>
Date: Fri, 2 Apr 2021 00:21:29 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Bartosz Golaszewski <bgolaszewski@...libre.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J. Wysocki" <rafael@...nel.org>
Subject: [PATCH v1 1/1] driver core: enable trace events (devres)
Enable trace events for driver core. For now only devres is supported.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
drivers/base/Makefile | 3 +++
drivers/base/devres.c | 12 ++++++++--
drivers/base/trace.c | 10 ++++++++
drivers/base/trace.h | 56 +++++++++++++++++++++++++++++++++++++++++++
4 files changed, 79 insertions(+), 2 deletions(-)
create mode 100644 drivers/base/trace.c
create mode 100644 drivers/base/trace.h
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index 8b93a7f291ec..ef8e44a7d288 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -30,3 +30,6 @@ obj-y += test/
ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
+# define_trace.h needs to know how to find our header
+CFLAGS_trace.o := -I$(src)
+obj-$(CONFIG_TRACING) += trace.o
diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index 8746f2212781..b8af6eddd13b 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -14,6 +14,7 @@
#include <asm/sections.h>
#include "base.h"
+#include "trace.h"
struct devres_node {
struct list_head entry;
@@ -54,7 +55,7 @@ static void set_node_dbginfo(struct devres_node *node, const char *name,
node->size = size;
}
-static void devres_log(struct device *dev, struct devres_node *node,
+static void devres_dbg(struct device *dev, struct devres_node *node,
const char *op)
{
if (unlikely(log_devres))
@@ -63,9 +64,16 @@ static void devres_log(struct device *dev, struct devres_node *node,
}
#else /* CONFIG_DEBUG_DEVRES */
#define set_node_dbginfo(node, n, s) do {} while (0)
-#define devres_log(dev, node, op) do {} while (0)
+#define devres_dbg(dev, node, op) do {} while (0)
#endif /* CONFIG_DEBUG_DEVRES */
+static void devres_log(struct device *dev, struct devres_node *node,
+ const char *op)
+{
+ trace_devres_log(dev, op, node, node->name, node->size);
+ devres_dbg(dev, node, op);
+}
+
/*
* Release functions for devres group. These callbacks are used only
* for identification.
diff --git a/drivers/base/trace.c b/drivers/base/trace.c
new file mode 100644
index 000000000000..b24b0a309c4a
--- /dev/null
+++ b/drivers/base/trace.c
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Device core Trace Support
+ * Copyright (C) 2021, Intel Corporation
+ *
+ * Author: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
+ */
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"
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@...ux.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>
--
2.30.2
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