[U-Boot] [PATCH 3/8] boottime: Add core boottime measurement support

[Lee Jones]

Boottime is a tool which can be used for full system booting time
measurement. Bootloader boot time is passed to the kernel component
though ATAGS. The kernel-side driver then uses this information to
provide full system boot time diagnostics though debugfs.

Based heavily on the original driver by Jonas Aaberg.

Signed-off-by: Lee Jones <lee.jones at linaro.org>
---
 common/Makefile    |    1 +
 common/boottime.c  |  146 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 include/boottime.h |   86 +++++++++++++++++++++++++++++++
 3 files changed, 233 insertions(+)
 create mode 100644 common/boottime.c
 create mode 100644 include/boottime.h

diff --git a/common/Makefile b/common/Makefile
index 9e43322..546acbf 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -192,6 +192,7 @@ COBJS-$(CONFIG_MODEM_SUPPORT) += modem.o
 COBJS-$(CONFIG_UPDATE_TFTP) += update.o
 COBJS-$(CONFIG_USB_KEYBOARD) += usb_kbd.o
 COBJS-$(CONFIG_CMD_DFU) += cmd_dfu.o
+COBJS-$(CONFIG_BOOTTIME) += boottime.o
 endif
 
 ifdef CONFIG_SPL_BUILD
diff --git a/common/boottime.c b/common/boottime.c
new file mode 100644
index 0000000..87be467
--- /dev/null
+++ b/common/boottime.c
@@ -0,0 +1,146 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2009-2010
+ * Jonas Aaberg <jonas.aberg at stericsson.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307	 USA
+ *
+ */
+
+#include <common.h>
+#include <boottime.h>
+#include <asm/byteorder.h>
+#include <asm/setup.h>
+
+#ifdef CONFIG_BOOTTIME
+
+static struct tag_boottime boottime = {
+	.idle = 0,
+	.total = 0,
+};
+
+void boottime_tag(char *name)
+{
+	if (boottime.num == BOOTTIME_MAX) {
+		printf("boottime: out of entries!\n");
+		return;
+	}
+
+	strncpy((char *)boottime.entry[boottime.num].name,
+		name,
+		BOOTTIME_MAX_NAME_LEN);
+	boottime.entry[boottime.num].name[BOOTTIME_MAX_NAME_LEN - 1] = '\0';
+	boottime.entry[boottime.num].time = get_timer_us();
+
+	boottime.num++;
+}
+
+struct boottime_entry *boottime_get_entry(unsigned int i)
+{
+	if (i >= boottime.num)
+		return NULL;
+	else
+		return &boottime.entry[i];
+}
+
+void boottime_idle_add(unsigned long time)
+{
+	boottime.idle += time;
+}
+
+unsigned long boottime_idle_done(void)
+{
+	return get_timer_us();
+}
+
+unsigned long boottime_idle_get(void)
+{
+	return boottime.idle;
+}
+
+static int do_boottime(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	unsigned int i;
+	struct boottime_entry *entry;
+
+	for (i = 0; i < BOOTTIME_MAX; i++) {
+		entry = boottime_get_entry(i);
+		if (entry == NULL)
+			break;
+		printf("%s: started at %lu ms\n", entry->name,
+		       (unsigned long)entry->time / 1000);
+	}
+	printf("idle: %d%% (%d ms)\n",
+	       100 * (int)boottime_idle_get() / (int)get_timer_us(),
+	       (int)boottime_idle_get() / 1000);
+	return 0;
+}
+
+static int do_boottime_tag (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+
+	if (argc < 2) {
+		cmd_usage(cmdtp);
+		return 1;
+	}
+	boottime_tag(argv[1]);
+
+	return 0;
+}
+
+U_BOOT_CMD(
+	boottime,	1,      1,      do_boottime,
+	"print boottime info",
+	""
+	"    - print boottime tags\n"
+);
+
+U_BOOT_CMD(
+	boottime_tag,	2,      1,      do_boottime_tag,
+	"boottime tag 'name'",
+	""
+	"    - Add a boottime tag at the current time\n"
+);
+
+#else
+/*
+ * Dummy functions when boottime is not enabled.
+ */
+static int do_boottime_tag (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	return 0;
+}
+
+void boottime_tag(char *name)
+{
+
+}
+
+void boottime_idle_add(unsigned long time)
+{
+
+}
+
+U_BOOT_CMD(
+	boottime_tag,	2,      1,      do_boottime_tag,
+	"boottime tag 'name'",
+	""
+	"    - NOT ENABLED: Add CONFIG_BOOTIME to your boards configuration"
+	" file to enable boottime.\n"
+);
+
+#endif
+
+
+
diff --git a/include/boottime.h b/include/boottime.h
new file mode 100644
index 0000000..58ea314
--- /dev/null
+++ b/include/boottime.h
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2009-2010
+ * Jonas Aaberg <jonas.aberg at stericsson.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307	 USA
+ *
+ */
+
+#ifndef BOOTTIME_H
+#define BOOTTIME_H
+
+#define BOOTTIME_MAX_NAME_LEN 64
+
+struct boottime_entry {
+	u32 time; /* in us */
+	u8  name[BOOTTIME_MAX_NAME_LEN];
+};
+
+#ifdef CONFIG_BOOTTIME
+
+/**
+ * boottime_tag()
+ * Add a sample point with a name now. Shall be called before function "name"
+ * is executed.
+ * @name: Sample point name.
+ */
+void boottime_tag(char *name);
+
+/**
+ * boottime_get_entry()
+ *
+ * Loads a boottime measure point information.
+ * @i: boottime measurement point entry.
+ *
+ * Returns a boottime entry. NULL, if not existing.
+ */
+struct boottime_entry *boottime_get_entry(unsigned int i);
+
+/**
+ * boottime_idle_get()
+ *
+ * Returns the amount of time in us that has been spent idling.
+ */
+unsigned long boottime_idle_get(void);
+
+/**
+ * boottime_idle_done()
+ *
+ * Returns the total time since start in us.
+ */
+unsigned long boottime_idle_done(void);
+
+/**
+ * boottime_idle_add()
+ *
+ * This function shall be added to all delay() functions.
+ * The delay time input to delay() shall be provided to this
+ * function as well. It is used to calculate average load
+ * during boot.
+ * @time: time in us.
+ */
+void boottime_idle_add(unsigned long time);
+
+#else /* CONFIG_BOOTTIME */
+
+static inline void boottime_tag(char *name) { return; }
+static inline struct boottime_entry *boottime_get_entry(unsigned int i) { return NULL; }
+static inline unsigned long boottime_idle_get(void) { return 0; }
+static inline unsigned long boottime_idle_done(void) { return 0; }
+static inline void boottime_idle_add(unsigned long time) { return; }
+
+#endif /* CONFIG_BOOTTIME */
+
+#endif /* BOOTTIME_H */
-- 
1.7.9.5