Commit 3a608ca0 authored by Simon Glass's avatar Simon Glass Committed by Wolfgang Denk
Browse files

bootstage: Implement core 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.

Most IDs are not named at this stage. For that I would first like to
renumber them all.

Timer summary in microseconds:
       Mark    Elapsed  Stage
          0          0  reset
    205,000    205,000  board_init_f
  6,053,000  5,848,000  bootm_start
  6,053,000          0  id=1
  6,058,000      5,000  id=101
  6,058,000          0  id=100
  6,061,000      3,000  id=103
  6,064,000      3,000  id=104
  6,093,000     29,000  id=107
  6,093,000          0  id=106
  6,093,000          0  id=105
  6,093,000          0  id=108
  7,089,000    996,000  id=7
  7,089,000          0  id=15
  7,089,000          0  id=8
  7,097,000      8,000  start_kernel
Signed-off-by: default avatarSimon Glass <sjg@chromium.org>
parent 770605e4
......@@ -2261,6 +2261,31 @@ The following options need to be configured:
example, some LED's) on your board. At the moment,
the following checkpoints are implemented:
- Detailed boot stage timing
CONFIG_BOOTSTAGE
Define this option to get detailed timing of each stage
of the boot process.
CONFIG_BOOTSTAGE_USER_COUNT
This is the number of available user bootstage records.
Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
a new ID will be allocated from this stash. If you exceed
the limit, recording will stop.
CONFIG_BOOTSTAGE_REPORT
Define this to print a report before boot, similar to this:
Timer summary in microseconds:
Mark Elapsed Stage
0 0 reset
3,575,678 3,575,678 board_init_f start
3,575,695 17 arch_cpu_init A9
3,575,777 82 arch_cpu_init done
3,659,598 83,821 board_init_r start
3,910,375 250,777 main_loop
29,916,167 26,005,792 bootm_start
30,361,327 445,160 start_kernel
Legacy uImage format:
Arg Where When
......
......@@ -172,6 +172,7 @@ SPD := y
endif
COBJS-$(SPD) += ddr_spd.o
COBJS-$(CONFIG_HWCONFIG) += hwconfig.o
COBJS-$(CONFIG_BOOTSTAGE) += bootstage.o
COBJS-$(CONFIG_CONSOLE_MUX) += iomux.o
COBJS-y += flash.o
COBJS-$(CONFIG_CMD_KGDB) += kgdb.o kgdb_stubs.o
......
/*
* 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.
*
* TBD: Pass timings to kernel in the FDT
*/
#include <common.h>
#include <libfdt.h>
DECLARE_GLOBAL_DATA_PTR;
enum bootstage_flags {
BOOTSTAGEF_ERROR = 1 << 0, /* Error record */
BOOTSTAGEF_ALLOC = 1 << 1, /* Allocate an id */
};
struct bootstage_record {
ulong time_us;
const char *name;
int flags; /* see enum bootstage_flags */
enum bootstage_id id;
};
static struct bootstage_record record[BOOTSTAGE_ID_COUNT] = { {1} };
static int next_id = BOOTSTAGE_ID_USER;
ulong bootstage_add_record(enum bootstage_id id, const char *name,
int flags)
{
struct bootstage_record *rec;
ulong mark = timer_get_boot_us();
if (flags & BOOTSTAGEF_ALLOC)
id = next_id++;
if (id < BOOTSTAGE_ID_COUNT) {
rec = &record[id];
/* Only record the first event for each */
if (!rec->time_us) {
rec->time_us = mark;
rec->name = name;
rec->flags = flags;
rec->id = id;
}
}
/* Tell the board about this progress */
show_boot_progress(flags & BOOTSTAGEF_ERROR ? -id : id);
return mark;
}
ulong bootstage_mark(enum bootstage_id id)
{
return bootstage_add_record(id, NULL, 0);
}
ulong bootstage_error(enum bootstage_id id)
{
return bootstage_add_record(id, NULL, BOOTSTAGEF_ERROR);
}
ulong bootstage_mark_name(enum bootstage_id id, const char *name)
{
int flags = 0;
if (id == BOOTSTAGE_ID_ALLOC)
flags = BOOTSTAGEF_ALLOC;
return bootstage_add_record(id, name, flags);
}
static void print_time(unsigned long us_time)
{
char str[15], *s;
int grab = 3;
/* We don't seem to have %'d in U-Boot */
sprintf(str, "%12lu", us_time);
for (s = str + 3; *s; s += grab) {
if (s != str + 3)
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 if (id >= BOOTSTAGE_ID_USER)
printf(" user_%d\n", id - BOOTSTAGE_ID_USER);
else
printf(" id=%d\n", id);
return rec->time_us;
}
static int h_compare_record(const void *r1, const void *r2)
{
const struct bootstage_record *rec1 = r1, *rec2 = r2;
return rec1->time_us > rec2->time_us ? 1 : -1;
}
void bootstage_report(void)
{
struct bootstage_record *rec = record;
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 */
rec->name = "reset";
rec->time_us = 0;
prev = print_time_record(BOOTSTAGE_ID_AWAKE, rec, 0);
/* Sort records by increasing time */
qsort(record, ARRAY_SIZE(record), sizeof(*rec), h_compare_record);
for (id = 0; id < BOOTSTAGE_ID_COUNT; id++, rec++) {
if (rec->time_us != 0)
prev = print_time_record(rec->id, rec, prev);
}
if (next_id > BOOTSTAGE_ID_COUNT)
printf("(Overflowed internal boot id table by %d entries\n"
"- please increase CONFIG_BOOTSTAGE_USER_COUNT\n",
next_id - BOOTSTAGE_ID_COUNT);
}
......@@ -26,6 +26,11 @@
#ifndef _BOOTSTAGE_H
#define _BOOTSTAGE_H
/* The number of boot stage records available for the user */
#ifndef CONFIG_BOOTSTAGE_USER_COUNT
#define CONFIG_BOOTSTAGE_USER_COUNT 20
#endif
/*
* A list of boot stages that we know about. Each of these indicates the
* state that we are at, and the action that we are about to perform. For
......@@ -169,6 +174,33 @@ enum bootstage_id {
BOOTSTAGE_ID_NAND_FIT_READ = 150,
BOOTSTAGE_ID_NAND_FIT_READ_OK,
/*
* These boot stages are new, higher level, and not directly related
* to the old boot progress numbers. They are useful for recording
* rough boot timing information.
*/
BOOTSTAGE_ID_AWAKE,
BOOTSTAGE_ID_START_UBOOT_F,
BOOTSTAGE_ID_START_UBOOT_R,
BOOTSTAGE_ID_USB_START,
BOOTSTAGE_ID_ETH_START,
BOOTSTAGE_ID_BOOTP_START,
BOOTSTAGE_ID_BOOTP_STOP,
BOOTSTAGE_ID_BOOTM_START,
BOOTSTAGE_ID_BOOTM_HANDOFF,
BOOTSTAGE_ID_MAIN_LOOP,
BOOTSTAGE_KERNELREAD_START,
BOOTSTAGE_KERNELREAD_STOP,
BOOTSTAGE_ID_CPU_AWAKE,
BOOTSTAGE_ID_MAIN_CPU_AWAKE,
BOOTSTAGE_ID_MAIN_CPU_READY,
/* a few spare for the user, from here */
BOOTSTAGE_ID_USER,
BOOTSTAGE_ID_COUNT = BOOTSTAGE_ID_USER + CONFIG_BOOTSTAGE_USER_COUNT,
BOOTSTAGE_ID_ALLOC,
};
/*
......@@ -189,6 +221,11 @@ ulong bootstage_mark(enum bootstage_id id);
ulong bootstage_error(enum bootstage_id id);
ulong bootstage_mark_name(enum bootstage_id id, const char *name);
/* Print a report about boot time */
void bootstage_report(void);
#else
/*
* This is a dummy implementation which just calls show_boot_progress(),
......@@ -207,6 +244,12 @@ static inline ulong bootstage_error(enum bootstage_id id)
return 0;
}
static inline ulong bootstage_mark_name(enum bootstage_id id, const char *name)
{
return 0;
}
#endif /* CONFIG_BOOTSTAGE */
#endif
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