[S] Change in coreboot[main]: src: Enforce CSE sync with pertinent GBB flag

[Dinesh Gehlot (Code Review)]

Dinesh Gehlot has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/83686?usp=email )

Change subject: src: Enforce CSE sync with pertinent GBB flag
......................................................................

src: Enforce CSE sync with pertinent GBB flag

The patch enforces CSE sync when the GBB flag GBB_FLAG_FORCE_CSME_SYNC
is enabled and the system is currently booting from the RO section.
Additionally, it integrates forced CSE sync into eSOL decision-making.

This patch is an enhancement of CB:5705989 featuring the new GBB flag.

BUG=b:353053317
TEST=Verified forced CSE sync on rex0 with GBB 0x200000

Cq-Depend: chromium:5718196
Change-Id: I228bc8ebf58719776f6c39e0bfbb7ad53d9bfb7f
Signed-off-by: Dinesh Gehlot 
---
M src/soc/intel/common/block/cse/cse_lite.c
1 file changed, 31 insertions(+), 5 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/86/83686/1

diff --git a/src/soc/intel/common/block/cse/cse_lite.c b/src/soc/intel/common/block/cse/cse_lite.c
index 0917897..333a799 100644
--- a/src/soc/intel/common/block/cse/cse_lite.c
+++ b/src/soc/intel/common/block/cse/cse_lite.c
@@ -769,6 +769,22 @@
    return CB_SUCCESS;
 }

+static bool is_cse_sync_enforced(void)
+{
+	/*
+	 * Force test CSE firmware update scenario if below conditions are being met:
+	 *  - CSE Update not required
+	 *  - VB2_GBB_FLAG_FORCE_CSME_SYNC flag is set
+	 *  - CSE FW is in RO
+	 */
+	struct vb2_context *ctx = vboot_get_context();
+	if ((vb2api_gbb_get_flags(ctx) & VB2_GBB_FLAG_FORCE_CSME_SYNC) &&
+		 cse_get_current_bp() == RO) {
+		return true;
+	}
+	return false;
+}
+
 static enum cse_update_status cse_check_update_status(struct region_device *target_rdev)
 {
    int ret;
@@ -787,12 +803,18 @@
    		cbfs_rw_version.build);

ret = cse_compare_sub_part_version(&cbfs_rw_version, cse_get_rw_version());
-	if (ret == 0)
+	if (ret == 0) {
+		if (is_cse_sync_enforced()) {
+			printk(BIOS_WARNING, "Force CSE Firmware upgrade for Autotest\n");
+			return CSE_UPDATE_UPGRADE;
+		}
    	return CSE_UPDATE_NOT_REQUIRED;
-	else if (ret < 0)
-		return CSE_UPDATE_DOWNGRADE;
-	else
-		return CSE_UPDATE_UPGRADE;
+	} else {
+		if (ret < 0)
+			return CSE_UPDATE_DOWNGRADE;
+		else
+			return CSE_UPDATE_UPGRADE;
+	}
 }

static enum cb_err cse_write_rw_region(const struct region_device *target_rdev,
@@ -1042,6 +1064,10 @@
    if (get_cse_ver_from_cbfs(&cbfs_rw_version) == CB_ERR)
    	return false;

+	/* Check if CSE sync is enforced */
+	if (is_cse_sync_enforced()) {
+		return true;
+	}
    return !!cse_compare_sub_part_version(&cbfs_rw_version, cse_get_rw_version());
 }