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timestamps: Fix syncing, logging and comments 

For timestamps added before CBMEM coming online and call to
timestamp_sync_cache_to_cbmem(), ts_table->base_time was
subtracted twice. The second time though, the value of zero
was subtracted.

Make the stamps logged on the console relative to base_time too,
such that cbmem -1 and cbmem -c outputs will match.

Remove comments about postponing initialisation of timestamps
to ramstage, that does not happen anymore.

Change-Id: Ia786c12c68c8921c0d09bc58a29fefdc72bf0c6d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38301
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
This commit is contained in:
Kyösti Mälkki 2020-01-09 08:41:46 +02:00 committed by Nico Huber
parent 8b93cb756c
commit d548edde4b
1 changed files with 6 additions and 9 deletions
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15
src/lib/timestamp.c
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@ -128,7 +128,7 @@ static void timestamp_add_table_entry(struct timestamp_table *ts_table,
tse = &ts_table->entries[ts_table->num_entries++];
tse->entry_id = id;
tse->entry_stamp = ts_time - ts_table->base_time;
tse->entry_stamp = ts_time;
if (ts_table->num_entries == ts_table->max_entries)
printk(BIOS_ERR, "ERROR: Timestamp table full\n");
@ -148,6 +148,7 @@ void timestamp_add(enum timestamp_id id, uint64_t ts_time)
return;
}
ts_time -= ts_table->base_time;
timestamp_add_table_entry(ts_table, id, ts_time);
if (CONFIG(TIMESTAMPS_ON_CONSOLE))
@ -206,22 +207,18 @@ static void timestamp_sync_cache_to_cbmem(struct timestamp_table *ts_cbmem_table
*
* If you try to initialize timestamps before ramstage but don't define
* a TIMESTAMP region, all operations will fail (safely), and coreboot
* will behave as if timestamps only get initialized in ramstage.
*
* If timestamps only get initialized in ramstage, the base_time from
* timestamp_init() will get ignored and all timestamps will be 0-based.
* will behave as if timestamps collection was disabled.
*/
/* Inherit cache base_time. */
ts_cbmem_table->base_time = ts_cache_table->base_time;
for (i = 0; i < ts_cache_table->num_entries; i++) {
struct timestamp_entry *tse = &ts_cache_table->entries[i];
timestamp_add_table_entry(ts_cbmem_table, tse->entry_id,
tse->entry_stamp);
}
/* Freshly added cbmem table has base_time 0. Inherit cache base_time */
if (ts_cbmem_table->base_time == 0)
ts_cbmem_table->base_time = ts_cache_table->base_time;
/* Cache no longer required. */
ts_cache_table->num_entries = 0;
}