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bootstage: Store boot timings in device tree

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Add an option, CONFIG_BOOTSTAGE_FDT to pass boot timings to the kernel
in the device tree, if available. To use this, you must have
CONFIG_OF_LIBFDT defined.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2012-09-28 08:56:37 +00:00
committed by Anatolij Gustschin
parent 0e99677358
commit 94fd1316b7
4 changed files with 120 additions and 6 deletions
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95
common/bootstage.c
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@@ -124,9 +124,32 @@ static void print_time(unsigned long us_time)
}
}
/**
* 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);
@@ -134,12 +157,8 @@ static uint32_t print_time_record(enum bootstage_id id,
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);
printf(" %s\n", get_record_name(buf, sizeof(buf), rec));
return rec->time_us;
}
@@ -150,6 +169,70 @@ static int h_compare_record(const void *r1, const void *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;