u-boot/common/bootstage.c
Simon Glass fcf509b807 bootstage: Add feature to stash/unstash bootstage info
It is useful to be able to write the bootstage information to memory for
use by a later utility, or the Linux kernel. Provide a function to do
this as well as a function to read bootstage information back and incorporate
it into the current table.

This also makes it possible for U-Boot to chain to another U-Boot and pass
on its bootstage information.

Signed-off-by: Simon Glass <sjg@chromium.org>
2012-10-03 00:52:40 +02:00

444 lines
10 KiB
C

/*
* 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;
struct bootstage_record {
ulong time_us;
uint32_t start_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;
enum {
BOOTSTAGE_VERSION = 0,
BOOTSTAGE_MAGIC = 0xb00757a3,
};
struct bootstage_hdr {
uint32_t version; /* BOOTSTAGE_VERSION */
uint32_t count; /* Number of records */
uint32_t size; /* Total data size (non-zero if valid) */
uint32_t magic; /* Unused */
};
ulong bootstage_add_record(enum bootstage_id id, const char *name,
int flags, ulong mark)
{
struct bootstage_record *rec;
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, timer_get_boot_us());
}
ulong bootstage_error(enum bootstage_id id)
{
return bootstage_add_record(id, NULL, BOOTSTAGEF_ERROR,
timer_get_boot_us());
}
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, timer_get_boot_us());
}
uint32_t bootstage_start(enum bootstage_id id, const char *name)
{
struct bootstage_record *rec = &record[id];
rec->start_us = timer_get_boot_us();
rec->name = name;
return rec->start_us;
}
uint32_t bootstage_accum(enum bootstage_id id)
{
struct bootstage_record *rec = &record[id];
uint32_t duration;
duration = (uint32_t)timer_get_boot_us() - rec->start_us;
rec->time_us += duration;
return duration;
}
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;
}
}
/**
* Get a record name as a printable string
*
* @param buf Buffer to put name if needed
* @param len Length of buffer
* @param rec Boot stage record to get the name from
* @return pointer to name, either from the record or pointing to buf.
*/
static const char *get_record_name(char *buf, int len,
struct bootstage_record *rec)
{
if (rec->name)
return rec->name;
else if (rec->id >= BOOTSTAGE_ID_USER)
snprintf(buf, len, "user_%d", rec->id - BOOTSTAGE_ID_USER);
else
snprintf(buf, len, "id=%d", rec->id);
return buf;
}
static uint32_t print_time_record(enum bootstage_id id,
struct bootstage_record *rec, uint32_t prev)
{
char buf[20];
if (prev == -1U) {
printf("%11s", "");
print_time(rec->time_us);
} else {
print_time(rec->time_us);
print_time(rec->time_us - prev);
}
printf(" %s\n", get_record_name(buf, sizeof(buf), rec));
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;
}
#ifdef CONFIG_OF_LIBFDT
/**
* Add all bootstage timings to a device tree.
*
* @param blob Device tree blob
* @return 0 on success, != 0 on failure.
*/
static int add_bootstages_devicetree(struct fdt_header *blob)
{
int bootstage;
char buf[20];
int id;
int i;
if (!blob)
return 0;
/*
* Create the node for bootstage.
* The address of flat device tree is set up by the command bootm.
*/
bootstage = fdt_add_subnode(blob, 0, "bootstage");
if (bootstage < 0)
return -1;
/*
* Insert the timings to the device tree in the reverse order so
* that they can be printed in the Linux kernel in the right order.
*/
for (id = BOOTSTAGE_ID_COUNT - 1, i = 0; id >= 0; id--, i++) {
struct bootstage_record *rec = &record[id];
int node;
if (id != BOOTSTAGE_ID_AWAKE && rec->time_us == 0)
continue;
node = fdt_add_subnode(blob, bootstage, simple_itoa(i));
if (node < 0)
break;
/* add properties to the node. */
if (fdt_setprop_string(blob, node, "name",
get_record_name(buf, sizeof(buf), rec)))
return -1;
/* Check if this is a 'mark' or 'accum' record */
if (fdt_setprop_cell(blob, node,
rec->start_us ? "accum" : "mark",
rec->time_us))
return -1;
}
return 0;
}
int bootstage_fdt_add_report(void)
{
if (add_bootstages_devicetree(working_fdt))
puts("bootstage: Failed to add to device tree\n");
return 0;
}
#endif
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 && !rec->start_us)
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);
puts("\nAccumulated time:\n");
for (id = 0, rec = record; id < BOOTSTAGE_ID_COUNT; id++, rec++) {
if (rec->start_us)
prev = print_time_record(id, rec, -1);
}
}
ulong __timer_get_boot_us(void)
{
static ulong base_time;
/*
* We can't implement this properly. Return 0 on the first call and
* larger values after that.
*/
if (base_time)
return get_timer(base_time) * 1000;
base_time = get_timer(0);
return 0;
}
ulong timer_get_boot_us(void)
__attribute__((weak, alias("__timer_get_boot_us")));
/**
* Append data to a memory buffer
*
* Write data to the buffer if there is space. Whether there is space or not,
* the buffer pointer is incremented.
*
* @param ptrp Pointer to buffer, updated by this function
* @param end Pointer to end of buffer
* @param data Data to write to buffer
* @param size Size of data
*/
static void append_data(char **ptrp, char *end, const void *data, int size)
{
char *ptr = *ptrp;
*ptrp += size;
if (*ptrp > end)
return;
memcpy(ptr, data, size);
}
int bootstage_stash(void *base, int size)
{
struct bootstage_hdr *hdr = (struct bootstage_hdr *)base;
struct bootstage_record *rec;
char buf[20];
char *ptr = base, *end = ptr + size;
uint32_t count;
int id;
if (hdr + 1 > (struct bootstage_hdr *)end) {
debug("%s: Not enough space for bootstage hdr\n", __func__);
return -1;
}
/* Write an arbitrary version number */
hdr->version = BOOTSTAGE_VERSION;
/* Count the number of records, and write that value first */
for (rec = record, id = count = 0; id < BOOTSTAGE_ID_COUNT;
id++, rec++) {
if (rec->time_us != 0)
count++;
}
hdr->count = count;
hdr->size = 0;
hdr->magic = BOOTSTAGE_MAGIC;
ptr += sizeof(*hdr);
/* Write the records, silently stopping when we run out of space */
for (rec = record, id = 0; id < BOOTSTAGE_ID_COUNT; id++, rec++) {
if (rec->time_us != 0)
append_data(&ptr, end, rec, sizeof(*rec));
}
/* Write the name strings */
for (rec = record, id = 0; id < BOOTSTAGE_ID_COUNT; id++, rec++) {
if (rec->time_us != 0) {
const char *name;
name = get_record_name(buf, sizeof(buf), rec);
append_data(&ptr, end, name, strlen(name) + 1);
}
}
/* Check for buffer overflow */
if (ptr > end) {
debug("%s: Not enough space for bootstage stash\n", __func__);
return -1;
}
/* Update total data size */
hdr->size = ptr - (char *)base;
printf("Stashed %d records\n", hdr->count);
return 0;
}
int bootstage_unstash(void *base, int size)
{
struct bootstage_hdr *hdr = (struct bootstage_hdr *)base;
struct bootstage_record *rec;
char *ptr = base, *end = ptr + size;
uint rec_size;
int id;
if (size == -1)
end = (char *)(~(uintptr_t)0);
if (hdr + 1 > (struct bootstage_hdr *)end) {
debug("%s: Not enough space for bootstage hdr\n", __func__);
return -1;
}
if (hdr->magic != BOOTSTAGE_MAGIC) {
debug("%s: Invalid bootstage magic\n", __func__);
return -1;
}
if (ptr + hdr->size > end) {
debug("%s: Bootstage data runs past buffer end\n", __func__);
return -1;
}
if (hdr->count * sizeof(*rec) > hdr->size) {
debug("%s: Bootstage has %d records needing %d bytes, but "
"only %d bytes is available\n", __func__, hdr->count,
hdr->count * sizeof(*rec), hdr->size);
return -1;
}
if (hdr->version != BOOTSTAGE_VERSION) {
debug("%s: Bootstage data version %#0x unrecognised\n",
__func__, hdr->version);
return -1;
}
if (next_id + hdr->count > BOOTSTAGE_ID_COUNT) {
debug("%s: Bootstage has %d records, we have space for %d\n"
"- please increase CONFIG_BOOTSTAGE_USER_COUNT\n",
__func__, hdr->count, BOOTSTAGE_ID_COUNT - next_id);
return -1;
}
ptr += sizeof(*hdr);
/* Read the records */
rec_size = hdr->count * sizeof(*record);
memcpy(record + next_id, ptr, rec_size);
/* Read the name strings */
ptr += rec_size;
for (rec = record + next_id, id = 0; id < hdr->count; id++, rec++) {
rec->name = ptr;
/* Assume no data corruption here */
ptr += strlen(ptr) + 1;
}
/* Mark the records as read */
next_id += hdr->count;
printf("Unstashed %d records\n", hdr->count);
return 0;
}