Boottime - A tool for automatic measurement of kernel and possible boot loader boot time.

The overhead is very low and the results will be found under sysfs/bootime, as well as
detailed results in debugfs under boottime/. The bootgraph* files are compatible with
scripts/bootgraph.pl. The reason for this patch is to provide data (sysfs/boottime)
suitable for automatic testcases as well as help for developers to reduce the boot
time (debugfs).

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/2760
Change-Id: Id8ea7226b3f1f783448962195193b90699d32fc6
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/3174
Tested-by: Mian Yousaf KAUKAB <mian.yousaf.kaukab@stericsson.com>
Reviewed-by: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>
Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 89 insertions, 0 deletions

diff --git a/include/linux/boottime.h b/include/linux/boottime.h
new file mode 100644
index 00000000000..9836c5b3175
--- /dev/null
+++ b/include/linux/boottime.h
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2009-2010
+ *
+ * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ *
+ * boottime is a tool for collecting start-up timing
+ * information and can together with boot loader support
+ * display a total system start-up time.
+ *
+ */
+
+#ifndef LINUX_BOOTTIME_H
+#define LINUX_BOOTTIME_H
+
+#ifdef CONFIG_BOOTTIME
+#include <linux/kernel.h>
+
+/**
+ * struct boottime_timer - Callbacks for generic timer.
+ * @init: Function to call at boottime initialization
+ * @get_time: Returns the number of us since start-up
+ *            Preferable this is based upon a free running timer.
+ *            This is the only required entry.
+ * @finalize: Called before init is executed and boottime is done.
+ */
+struct boottime_timer {
+	int (*init)(void);
+	unsigned long (*get_time)(void);
+	void (*finalize)(void);
+};
+
+/**
+ * boottime_mark_wtime()
+ * Add a sample point with a given time. Useful for adding data collected
+ * by for example a boot loader.
+ * @name: The name of the sample point
+ * @time: The time in us when this point was reached
+ */
+void __init boottime_mark_wtime(char *name, unsigned long time);
+
+/**
+ * boottime_mark()
+ * Add a sample point with the current time.
+ * @name: The name of this sample point
+ */
+void __init boottime_mark(char *name);
+
+/**
+ * boottime_mark_symbolic()
+ * Add a sample point where the name is a symbolic function
+ * and %pF is needed to get the correct function name.
+ * @name: function name.
+ */
+void __init boottime_mark_symbolic(void *name);
+
+/**
+ * boottime_activate()
+ * Activates boottime and register callbacks.
+ * @bt: struct with callbacks.
+ */
+void __ref boottime_activate(struct boottime_timer *bt);
+
+/**
+ * boottime_deactivate()
+ * This function is called when the kernel boot is done.
+ * (before "free init memory" is called)
+ */
+void __init boottime_deactivate(void);
+
+/**
+ * boottime_system_up()
+ * A function is called when the basics of the kernel
+ * is up and running.
+ */
+void __init boottime_system_up(void);
+
+#else
+
+#define boottime_mark_wtime(name, time)
+#define boottime_mark(name)
+#define boottime_mark_symbolic(name)
+#define boottime_activate(bt)
+#define boottime_deactivate()
+#define boottime_system_up()
+#endif
+
+#endif /* LINUX_BOOTTIME_H */