[PATCH 3/8] drm/amdgpu: Fixup detect and reset

[Amber Lin <Amber.Lin@amd.com>]

Identify hung queues by comparing doorbells shown in hqd_info from MES
with doorbells stored in the driver to find matching queues.

Suggested-by: Jonathan Kim <jonathan.kim@amd.com>
Signed-off-by: Amber Lin <Amber.Lin@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c | 38 ++++++++++++++++---------
 1 file changed, 25 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
index b68bf4a9cb40..bea509f6b3ff 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
@@ -465,23 +465,35 @@ int amdgpu_mes_detect_and_reset_hung_queues(struct amdgpu_device *adev,
 
 	r = adev->mes.funcs->detect_and_reset_hung_queues(&adev->mes,
 							  &input);
-	if (r) {
-		dev_err(adev->dev, "failed to detect and reset\n");
-	} else {
-		*hung_db_num = 0;
-		for (i = 0; i < adev->mes.hung_queue_hqd_info_offset; i++) {
-			if (db_array[i] != AMDGPU_MES_INVALID_DB_OFFSET) {
-				hung_db_array[i] = db_array[i];
-				*hung_db_num += 1;
-			}
+
+	if (r && detect_only) {
+		dev_err(adev->dev, "Failed to detect hung queues\n");
+		return r;
+	}
+
+	*hung_db_num = 0;
+	/* MES passes hung queues' doorbell to driver */
+	for (i = 0; i < adev->mes.hung_queue_hqd_info_offset; i++) {
+		/* Finding hung queues where db_array[i] is a valid doorbell */
+		if (db_array[i] != AMDGPU_MES_INVALID_DB_OFFSET) {
+			hung_db_array[i] = db_array[i];
+			*hung_db_num += 1;
 		}
+	}
 
-		/*
-		 * TODO: return HQD info for MES scheduled user compute queue reset cases
-		 * stored in hung_db_array hqd info offset to full array size
-		 */
+	if (r && !hung_db_num) {
+		dev_err(adev->dev, "Failed to detect and reset hung queues\n");
+		return r;
 	}
 
+	/*
+	 * TODO: return HQD info for MES scheduled user compute queue reset cases
+	 * stored in hung_db_array hqd info offset to full array size
+	 */
+
+	if (r)
+		dev_err(adev->dev, "failed to reset\n");
+
 	return r;
 }
 
-- 
2.43.0