diff options
author | Simon Glass <sjg@chromium.org> | 2011-04-07 10:14:41 -0700 |
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committer | Simon Glass <sjg@chromium.org> | 2011-08-24 09:56:21 -0700 |
commit | 9530dc99ee3539909935e8a60a2bb756499c8318 (patch) | |
tree | 9e67946a7e123dfa8a65c97629a726dcbd80e591 /common/bootstage.c | |
parent | 29897caccd59d51e110475edbaa483175f1f363f (diff) |
Add microsecond boot time measurement
This defines the basics of a new boot time measurement feature. This allows
logging of very accurate time measurements as the boot proceeds, by using
an available microsecond counter.
To enable the feature, define CONFIG_BOOTSTAGE in your board config file.
Also available is CONFIG_BOOTSTAGE_REPORT which will cause a report to be
printed just before handing off to the OS.
BUG=chromium-os:13875
TEST=build and boot, check that progress is reported before running Linux:
Timer summary in microseconds:
Mark Elapsed Stage
0 0 awake
2,181,078 2,181,078 usb_start
11,861,817 9,680,739 bootp_start
11,884,610 22,793 bootp_stop
11,884,689 79 tftp start
15,271,536 3,386,847 tftp done
15,271,568 32 bootm_start
15,406,551 134,983 start_kernel
Change-Id: I71b89c8402dc5dec75e68333bd24a6bab7500a1b
Reviewed-on: http://gerrit.chromium.org/gerrit/197
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'common/bootstage.c')
-rw-r--r-- | common/bootstage.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/common/bootstage.c b/common/bootstage.c new file mode 100644 index 0000000000..6fd0083a68 --- /dev/null +++ b/common/bootstage.c @@ -0,0 +1,98 @@ +/* + * Copyright (c) 2011, Google Inc. All rights reserved. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 + */ + + +/* + * This module records the progress of boot and arbitrary commands, and + * permits accurate timestamping of each. The records can optionally be + * passed to kernel in the ATAGs + */ + +#include <common.h> + + +struct bootstage_record { + uint32_t time_us; + const char *name; +}; + +static struct bootstage_record record[BOOTSTAGE_COUNT]; + +uint32_t bootstage_mark(enum bootstage_id id, const char *name) +{ + struct bootstage_record *rec = &record[id]; + + /* Only record the first event for each */ + if (!rec->name) { + rec->time_us = (uint32_t)timer_get_us(); + rec->name = name; + } + return rec->time_us; +} + +static void print_time(unsigned long us_time) +{ + char str[12], *s; + int grab = 3; + + /* We don't seem to have %'d in U-Boot */ + sprintf(str, "%9ld", us_time); + for (s = str; *s; s += grab) { + if (s != str) + putc(s[-1] != ' ' ? ',' : ' '); + printf("%.*s", grab, s); + grab = 3; + } +} + +static uint32_t print_time_record(enum bootstage_id id, + struct bootstage_record *rec, uint32_t prev) +{ + print_time(rec->time_us); + print_time(rec->time_us - prev); + if (rec->name) + printf(" %s\n", rec->name); + else + printf(" id=%d\n", id); + return rec->time_us; +} + +void bootstage_report(void) +{ + int id; + uint32_t prev; + + puts("Timer summary in microseconds:\n"); + printf("%11s%11s %s\n", "Mark", "Elapsed", "Stage"); + + /* Fake the first record - we could get it from early boot */ + prev = 0; + record[BOOTSTAGE_AWAKE].name = "awake"; + + for (id = 0; id < BOOTSTAGE_COUNT; id++) { + struct bootstage_record *rec = &record[id]; + + if (id == BOOTSTAGE_AWAKE || rec->time_us != 0) + prev = print_time_record(id, rec, prev); + } +} + |