SAF MHB errors are collected and classifed under Fabric error component
by System controller. For SAF_MHB errors, if the cause is data
payload parity error then log and return.

For all other errors and causes, request a Secondary Bus Reset (SBR)

Signed-off-by: Riana Tauro <riana.tauro@intel.com>
---
 drivers/gpu/drm/xe/xe_ras.c       | 20 ++++++++++++++++++++
 drivers/gpu/drm/xe/xe_ras_types.h |  4 ++++
 2 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_ras.c b/drivers/gpu/drm/xe/xe_ras.c
index d25d25f77531..586dc28a638a 100644
--- a/drivers/gpu/drm/xe/xe_ras.c
+++ b/drivers/gpu/drm/xe/xe_ras.c
@@ -394,6 +394,23 @@ static u8 handle_device_memory_errors(struct xe_device *xe, struct xe_ras_error_
 	return XE_RAS_RECOVERY_ACTION_RECOVERED;
 }
 
+static u8 handle_fabric_errors(struct xe_device *xe, struct xe_ras_error_array *arr)
+{
+	struct xe_ras_error_product *product = &arr->counter.product;
+	struct xe_ras_ieh_error *info = (void *)arr->details;
+
+	if ((info->global_error_status & XE_RAS_FAB_IEH_SAF_MHB) &&
+	    product->cause.cause == XE_RAS_FAB_CAUSE_PAYLOAD) {
+		xe_log_comp_recoverable(xe, FABRIC, &arr->counter, sizeof(arr->counter),
+					"SAF MHB error detected\n");

We need to convert RAS to CPER severity and make use of xe_log_comp SIGID helper function with arr->counter.common.severity.

Helper function will take care of severity.

+		return XE_RAS_RECOVERY_ACTION_RECOVERED;
+	}
+
+	xe_log_comp_fatal(xe, FABRIC, &arr->counter, sizeof(arr->counter),
+			  "Other errors detected\n");

+	return XE_RAS_RECOVERY_ACTION_RESET;
+}
+
 void xe_ras_counter_threshold_crossed(struct xe_device *xe,
 				      struct xe_sysctrl_event_response *response)
 {
@@ -555,6 +572,9 @@ enum xe_ras_recovery_action xe_ras_process_errors(struct xe_device *xe)
 			case XE_RAS_COMP_DEVICE_MEMORY:
 				action = handle_device_memory_errors(xe, arr);
 				break;
+			case XE_RAS_COMP_FABRIC:
+				action = handle_fabric_errors(xe, arr);
+				break;
 			default:
 				/* For any other component, reset */
 				action = XE_RAS_RECOVERY_ACTION_RESET;
diff --git a/drivers/gpu/drm/xe/xe_ras_types.h b/drivers/gpu/drm/xe/xe_ras_types.h
index 99b2466e2062..73517fd0d415 100644
--- a/drivers/gpu/drm/xe/xe_ras_types.h
+++ b/drivers/gpu/drm/xe/xe_ras_types.h
@@ -12,6 +12,10 @@
 #define XE_RAS_NUM_ERROR_ARR			3
 /* Error bits in IEH global error status register */
 #define XE_RAS_SOC_IEH_PUNIT			BIT(1)
+/* Bits 16-31 represent individual SAF MHB unit */
+#define XE_RAS_FAB_IEH_SAF_MHB			GENMASK(31, 16)
+/* Fabric Data payload parity errors */
+#define XE_RAS_FAB_CAUSE_PAYLOAD		BIT(2)
 /* Device memory error categories */
 #define XE_RAS_MEMORY_DB_ECC			BIT(1)
 #define XE_RAS_MEMORY_POISON			BIT(2)