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drivers/elog: Add support for early elog 

Add support to log events during the preram stages.

BUG=b:117884485
BRANCH=None
TEST=Add an event log from romstage, boot to ChromeOS

Change-Id: Ia69515961da3bc72740f9b048a53d91af79c5b0d
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/29358
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Karthikeyan Ramasubramanian 2018-11-08 11:57:51 -07:00 committed by Aaron Durbin
parent 2a244c682e
commit 5ac4b8552a
3 changed files with 23 additions and 5 deletions
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6
src/drivers/elog/Kconfig
View File

@ -36,6 +36,12 @@ config ELOG_CBMEM
but it means that events added at runtime via the SMI handler
will not be reflected in the CBMEM copy of the log.
config ELOG_PRERAM
bool
default n
help
This option will enable event logging from the preram stage.
endif
config ELOG_GSMI

4
src/drivers/elog/Makefile.inc
View File

@ -1,3 +1,7 @@
bootblock-$(CONFIG_ELOG_PRERAM) += elog.c
verstage-$(CONFIG_ELOG_PRERAM) += elog.c
romstage-$(CONFIG_ELOG_PRERAM) += elog.c
postcar-$(CONFIG_ELOG_PRERAM) += elog.c
ramstage-$(CONFIG_ELOG) += elog.c
smm-$(CONFIG_ELOG_GSMI) += elog.c gsmi.c

18
src/drivers/elog/elog.c
View File

@ -70,6 +70,14 @@ struct elog_state {
static struct elog_state g_elog_state CAR_GLOBAL;
#define ELOG_SIZE (4 * KiB)
static uint8_t elog_mirror_buf[ELOG_SIZE] CAR_GLOBAL;
static void *get_elog_mirror_buffer(void)
{
return car_get_var_ptr(elog_mirror_buf);
}
static inline struct region_device *mirror_dev_get(void)
{
struct elog_state *es = car_get_var_ptr(&g_elog_state);
@ -706,9 +714,9 @@ static int elog_find_flash(void)
return -1;
}
if (region_device_sz(rdev) < 4*KiB) {
printk(BIOS_WARNING, "ELOG: Needs a minimum size of 4KiB: %zu\n",
region_device_sz(rdev));
if (region_device_sz(rdev) < ELOG_SIZE) {
printk(BIOS_WARNING, "ELOG: Needs a minimum size of %dKiB: %zu\n",
ELOG_SIZE / KiB, region_device_sz(rdev));
return -1;
}
@ -716,7 +724,7 @@ static int elog_find_flash(void)
region_device_offset(rdev), region_device_sz(rdev));
/* Keep 4KiB max size until large malloc()s have been fixed. */
total_size = MIN(4*KiB, region_device_sz(rdev));
total_size = MIN(ELOG_SIZE, region_device_sz(rdev));
rdev_chain(rdev, rdev, 0, total_size);
es->full_threshold = total_size - reserved_space;
@ -828,7 +836,7 @@ int elog_init(void)
return -1;
elog_size = region_device_sz(&es->nv_dev);
mirror_buffer = malloc(elog_size);
mirror_buffer = get_elog_mirror_buffer();
if (!mirror_buffer) {
printk(BIOS_ERR, "ELOG: Unable to allocate backing store\n");
return -1;