[PATCH 2/2] drm/xe/guc: Support crash dump notification from GuC

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

Add support for the two crash dump notifications from GuC. Either one
means GuC is toast, so just capture state trigger a reset.

Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
---
 drivers/gpu/drm/xe/xe_guc_ct.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c
index 63bd91963eb1..7eb175a0b874 100644
--- a/drivers/gpu/drm/xe/xe_guc_ct.c
+++ b/drivers/gpu/drm/xe/xe_guc_ct.c
@@ -54,6 +54,7 @@ enum {
 	CT_DEAD_PARSE_G2H_UNKNOWN,		/* 0x1000 */
 	CT_DEAD_PARSE_G2H_ORIGIN,		/* 0x2000 */
 	CT_DEAD_PARSE_G2H_TYPE,			/* 0x4000 */
+	CT_DEAD_CRASH,				/* 0x8000 */
 };
 
 static void ct_dead_worker_func(struct work_struct *w);
@@ -1120,6 +1121,24 @@ static int parse_g2h_event(struct xe_guc_ct *ct, u32 *msg, u32 len)
 	return 0;
 }
 
+static int guc_crash_process_msg(struct xe_guc_ct *ct, u32 action)
+{
+	struct xe_gt *gt = ct_to_gt(ct);
+
+	if (action == XE_GUC_ACTION_NOTIFY_CRASH_DUMP_POSTED)
+		xe_gt_err(gt, "GuC Crash dump notification\n");
+	else if (action == XE_GUC_ACTION_NOTIFY_EXCEPTION)
+		xe_gt_err(gt, "GuC Exception notification\n");
+	else
+		xe_gt_err(gt, "Unknown GuC crash notification: 0x%04X\n", action);
+
+	CT_DEAD(ct, NULL, CRASH);
+
+	kick_reset(ct);
+
+	return 0;
+}
+
 static int parse_g2h_response(struct xe_guc_ct *ct, u32 *msg, u32 len)
 {
 	struct xe_gt *gt =  ct_to_gt(ct);
@@ -1294,6 +1313,10 @@ static int process_g2h_msg(struct xe_guc_ct *ct, u32 *msg, u32 len)
 	case GUC_ACTION_GUC2PF_ADVERSE_EVENT:
 		ret = xe_gt_sriov_pf_monitor_process_guc2pf(gt, hxg, hxg_len);
 		break;
+	case XE_GUC_ACTION_NOTIFY_CRASH_DUMP_POSTED:
+	case XE_GUC_ACTION_NOTIFY_EXCEPTION:
+		ret = guc_crash_process_msg(ct, action);
+		break;
 	default:
 		xe_gt_err(gt, "unexpected G2H action 0x%04x\n", action);
 	}
-- 
2.47.0