GNUBoot/coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

drivers/elog: Add support for early elog

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

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 but it means that events added at runtime via the SMI handler
will not be reflected in the CBMEM copy of the log. 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 endif
config ELOG_GSMI 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-$(CONFIG_ELOG) += elog.c ramstage-$(CONFIG_ELOG) += elog.c
smm-$(CONFIG_ELOG_GSMI) += elog.c gsmi.c smm-$(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; 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) static inline struct region_device *mirror_dev_get(void)
{ {
struct elog_state *es = car_get_var_ptr(&g_elog_state); struct elog_state *es = car_get_var_ptr(&g_elog_state);
@ -706,9 +714,9 @@ static int elog_find_flash(void)
return -1; return -1;
} }
if (region_device_sz(rdev) < 4*KiB) { if (region_device_sz(rdev) < ELOG_SIZE) {
printk(BIOS_WARNING, "ELOG: Needs a minimum size of 4KiB: %zu\n", printk(BIOS_WARNING, "ELOG: Needs a minimum size of %dKiB: %zu\n",
region_device_sz(rdev)); ELOG_SIZE / KiB, region_device_sz(rdev));
return -1; return -1;
} }
@ -716,7 +724,7 @@ static int elog_find_flash(void)
region_device_offset(rdev), region_device_sz(rdev)); region_device_offset(rdev), region_device_sz(rdev));
/* Keep 4KiB max size until large malloc()s have been fixed. */ /* 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); rdev_chain(rdev, rdev, 0, total_size);
es->full_threshold = total_size - reserved_space; es->full_threshold = total_size - reserved_space;
@ -828,7 +836,7 @@ int elog_init(void)
return -1; return -1;
elog_size = region_device_sz(&es->nv_dev); elog_size = region_device_sz(&es->nv_dev);
mirror_buffer = malloc(elog_size); mirror_buffer = get_elog_mirror_buffer();
if (!mirror_buffer) { if (!mirror_buffer) {
printk(BIOS_ERR, "ELOG: Unable to allocate backing store\n"); printk(BIOS_ERR, "ELOG: Unable to allocate backing store\n");
return -1; return -1;