[PATCH v3 2/2] EDAC/altera: Check previous DDR DBE during driver probe

[niravkumar.l.rabara@intel.com]

From: Niravkumar L Rabara <niravkumar.l.rabara@intel.com>

Add DDR DBE check during driver probe to notify user if previous
reboot cause by DDR DBE and print DBE error related information.

Signed-off-by: Niravkumar L Rabara <niravkumar.l.rabara@intel.com>
---
 drivers/edac/altera_edac.c | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index 8b31cd54bdb6..04c0675adc8c 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -2159,6 +2159,7 @@ static int altr_edac_a10_probe(struct platform_device *pdev)
 #ifdef CONFIG_64BIT
 	{
 		int dberror, err_addr;
+		struct arm_smccc_res result;
 
 		edac->panic_notifier.notifier_call = s10_edac_dberr_handler;
 		atomic_notifier_chain_register(&panic_notifier_list,
@@ -2168,11 +2169,29 @@ static int altr_edac_a10_probe(struct platform_device *pdev)
 		regmap_read(edac->ecc_mgr_map, S10_SYSMGR_UE_VAL_OFST,
 			    &dberror);
 		if (dberror) {
-			regmap_read(edac->ecc_mgr_map, S10_SYSMGR_UE_ADDR_OFST,
-				    &err_addr);
-			edac_printk(KERN_ERR, EDAC_DEVICE,
-				    "Previous Boot UE detected[0x%X] @ 0x%X\n",
-				    dberror, err_addr);
+			/* Bit-31 is set if previous DDR UE happened */
+			if (dberror & (1 << 31)) {
+				/* Read previous DDR UE info */
+				arm_smccc_smc(INTEL_SIP_SMC_READ_SEU_ERR, 0,
+					      0, 0, 0, 0, 0, 0, &result);
+
+				if (!result.a0) {
+					edac_printk(KERN_ERR, EDAC_DEVICE,
+						    "Previous DDR UE:Count=0x%X,Address=0x%X,ErrorData=0x%X\n"
+						    , (unsigned int)result.a1
+						    , (unsigned int)result.a2
+						    , (unsigned int)result.a3);
+				} else {
+					edac_printk(KERN_ERR, EDAC_DEVICE,
+						    "INTEL_SIP_SMC_SEU_ERR_STATUS failed\n");
+				}
+			} else {
+				regmap_read(edac->ecc_mgr_map, S10_SYSMGR_UE_ADDR_OFST,
+					    &err_addr);
+				edac_printk(KERN_ERR, EDAC_DEVICE,
+					    "Previous Boot UE detected[0x%X] @ 0x%X\n",
+					    dberror, err_addr);
+			}
 			/* Reset the sticky registers */
 			regmap_write(edac->ecc_mgr_map,
 				     S10_SYSMGR_UE_VAL_OFST, 0);
-- 
2.25.1