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soc/intel/common: provide option to invalide MRC cache on recovery 

Allow a board/platform to invalidate the normal MRC cache when
hardware retraining is requested in recovery mode. A small 4 byte
payload is used to update the latest data written. It will of course
fail on MRC cache retreival on next usage.

BUG=chrome-os-partner:60592
BRANCH=reef

Change-Id: Ic88cd66802664813562d003f50d54e4a4ea375ef
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/17870
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
This commit is contained in:
Aaron Durbin 2016-12-14 15:36:56 -06:00
parent 8f9a5ff8ec
commit d09142c136
2 changed files with 38 additions and 0 deletions
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4
src/soc/intel/common/Kconfig
View File

@ -31,6 +31,10 @@ config HAS_RECOVERY_MRC_CACHE
bool
default n
config MRC_CLEAR_NORMAL_CACHE_ON_RECOVERY_RETRAIN
bool
default n
config MRC_SETTINGS_VARIABLE_DATA
bool
default n

34
src/soc/intel/common/mrc_cache.c
View File

@ -486,6 +486,37 @@ static void protect_mrc_region(void)
protect_mrc_cache(DEFAULT_MRC_CACHE);
}
static void invalidate_normal_cache(void)
{
struct region_file cache_file;
struct region_device rdev;
const char *name = DEFAULT_MRC_CACHE;
const uint32_t invalid = ~MRC_DATA_SIGNATURE;
/* Invalidate only on recovery mode with retraining enabled. */
if (!vboot_recovery_mode_enabled())
return;
if (!vboot_recovery_mode_memory_retrain())
return;
if (fmap_locate_area_as_rdev_rw(name, &rdev) < 0) {
printk(BIOS_ERR, "MRC: Couldn't find '%s' region. Invalidation failed\n",
name);
return;
}
if (region_file_init(&cache_file, &rdev) < 0) {
printk(BIOS_ERR, "MRC: region file invalid for '%s'. Invalidation failed\n",
name);
return;
}
/* Push an update that consists of 4 bytes that is smaller than the
* MRC metadata as well as an invalid signature. */
if (region_file_update_data(&cache_file, &invalid, sizeof(invalid)) < 0)
printk(BIOS_ERR, "MRC: invalidation failed for '%s'.\n", name);
}
static void update_mrc_cache(void *unused)
{
update_mrc_cache_by_type(MRC_TRAINING_DATA);
@ -493,6 +524,9 @@ static void update_mrc_cache(void *unused)
if (IS_ENABLED(CONFIG_MRC_SETTINGS_VARIABLE_DATA))
update_mrc_cache_by_type(MRC_VARIABLE_DATA);
if (IS_ENABLED(CONFIG_MRC_CLEAR_NORMAL_CACHE_ON_RECOVERY_RETRAIN))
invalidate_normal_cache();
protect_mrc_region();
}